apps/silcd/command.c

   1 /*
   2
   3   command.c
   4
   5   Author: Pekka Riikonen <priikone@poseidon.pspt.fi>
   6
   7   Copyright (C) 1997 - 2001 Pekka Riikonen
   8
   9   This program is free software; you can redistribute it and/or modify
  10   it under the terms of the GNU General Public License as published by
  11   the Free Software Foundation; either version 2 of the License, or
  12   (at your option) any later version.
  13
  14   This program is distributed in the hope that it will be useful,
  15   but WITHOUT ANY WARRANTY; without even the implied warranty of
  16   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17   GNU General Public License for more details.
  18
  19 */
  20 /* $Id$ */
  21
  22 #include "serverincludes.h"
  23 #include "server_internal.h"
  24
  25 static int silc_server_is_registered(SilcServer server,
  26                                      SilcSocketConnection sock,
  27                                      SilcServerCommandContext cmd,
  28                                      SilcCommand command);
  29 static void
  30 silc_server_command_send_status_reply(SilcServerCommandContext cmd,
  31                                       SilcCommand command,
  32                                       SilcCommandStatus status);
  33 static void
  34 silc_server_command_send_status_data(SilcServerCommandContext cmd,
  35                                      SilcCommand command,
  36                                      SilcCommandStatus status,
  37                                      uint32 arg_type,
  38                                      unsigned char *arg,
  39                                      uint32 arg_len);
  40 static bool
  41 silc_server_command_pending_error_check(SilcServerCommandContext cmd,
  42                                         SilcServerCommandReplyContext cmdr,
  43                                         SilcCommand command);
  44 SILC_TASK_CALLBACK(silc_server_command_process_timeout);
  45
  46 /* Server command list. */
  47 SilcServerCommand silc_command_list[] =
  48 {
  49   SILC_SERVER_CMD(whois, WHOIS, SILC_CF_LAG | SILC_CF_REG),
  50   SILC_SERVER_CMD(whowas, WHOWAS, SILC_CF_LAG | SILC_CF_REG),
  51   SILC_SERVER_CMD(identify, IDENTIFY, SILC_CF_LAG | SILC_CF_REG),
  52   SILC_SERVER_CMD(nick, NICK, SILC_CF_LAG_STRICT | SILC_CF_REG),
  53   SILC_SERVER_CMD(list, LIST, SILC_CF_LAG_STRICT | SILC_CF_REG),
  54   SILC_SERVER_CMD(topic, TOPIC, SILC_CF_LAG | SILC_CF_REG),
  55   SILC_SERVER_CMD(invite, INVITE, SILC_CF_LAG | SILC_CF_REG),
  56   SILC_SERVER_CMD(quit, QUIT, SILC_CF_LAG | SILC_CF_REG),
  57   SILC_SERVER_CMD(kill, KILL, SILC_CF_LAG_STRICT | SILC_CF_REG | SILC_CF_OPER),
  58   SILC_SERVER_CMD(info, INFO, SILC_CF_LAG | SILC_CF_REG),
  59   SILC_SERVER_CMD(connect, CONNECT,
  60                   SILC_CF_LAG | SILC_CF_REG | SILC_CF_OPER),
  61   SILC_SERVER_CMD(ping, PING, SILC_CF_LAG | SILC_CF_REG),
  62   SILC_SERVER_CMD(oper, OPER, SILC_CF_LAG | SILC_CF_REG | SILC_CF_OPER),
  63   SILC_SERVER_CMD(join, JOIN, SILC_CF_LAG_STRICT | SILC_CF_REG),
  64   SILC_SERVER_CMD(motd, MOTD, SILC_CF_LAG | SILC_CF_REG),
  65   SILC_SERVER_CMD(umode, UMODE, SILC_CF_LAG | SILC_CF_REG),
  66   SILC_SERVER_CMD(cmode, CMODE, SILC_CF_LAG_STRICT | SILC_CF_REG),
  67   SILC_SERVER_CMD(cumode, CUMODE, SILC_CF_LAG | SILC_CF_REG),
  68   SILC_SERVER_CMD(kick, KICK, SILC_CF_LAG_STRICT | SILC_CF_REG),
  69   SILC_SERVER_CMD(ban, BAN, SILC_CF_LAG_STRICT | SILC_CF_REG),
  70   SILC_SERVER_CMD(close, CLOSE,
  71                   SILC_CF_LAG | SILC_CF_REG | SILC_CF_OPER),
  72   SILC_SERVER_CMD(shutdown, SHUTDOWN, SILC_CF_LAG | SILC_CF_REG |
  73                   SILC_CF_OPER),
  74   SILC_SERVER_CMD(silcoper, SILCOPER,
  75                   SILC_CF_LAG | SILC_CF_REG | SILC_CF_SILC_OPER),
  76   SILC_SERVER_CMD(leave, LEAVE, SILC_CF_LAG_STRICT | SILC_CF_REG),
  77   SILC_SERVER_CMD(users, USERS, SILC_CF_LAG | SILC_CF_REG),
  78   SILC_SERVER_CMD(getkey, GETKEY, SILC_CF_LAG | SILC_CF_REG),
  79
  80   { NULL, 0 },
  81 };
  82
  83 /* Performs several checks to the command. It first checks whether this
  84    command was called as pending command callback. If it was then it checks
  85    whether error occurred in the command reply where the pending command
  86    callback was called.
  87
  88    It also checks that the requested command includes correct amount
  89    of arguments. */
  90 #define SILC_SERVER_COMMAND_CHECK(command, context, min, max)                 \
  91 do {                                                                          \
  92   uint32 _argc;                                                               \
  93                                                                               \
  94   SILC_LOG_DEBUG(("Start"));                                                  \
  95                                                                               \
  96   if (silc_server_command_pending_error_check(cmd, context2, command)) {      \
  97     silc_server_command_free(cmd);                                            \
  98     return;                                                                   \
  99   }                                                                           \
 100                                                                               \
 101   _argc = silc_argument_get_arg_num(cmd->args);                               \
 102   if (_argc < min) {                                                          \
 103     silc_server_command_send_status_reply(cmd, command,                       \
 104                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS); \
 105     silc_server_command_free(cmd);                                            \
 106     return;                                                                   \
 107   }                                                                           \
 108   if (_argc > max) {                                                          \
 109     silc_server_command_send_status_reply(cmd, command,                       \
 110                                           SILC_STATUS_ERR_TOO_MANY_PARAMS);   \
 111     silc_server_command_free(cmd);                                            \
 112     return;                                                                   \
 113   }                                                                           \
 114 } while(0)
 115
 116 /* Returns TRUE if the connection is registered. Unregistered connections
 117    usually cannot send commands hence the check. */
 118
 119 static int silc_server_is_registered(SilcServer server,
 120                                      SilcSocketConnection sock,
 121                                      SilcServerCommandContext cmd,
 122                                      SilcCommand command)
 123 {
 124   SilcIDListData idata = (SilcIDListData)sock->user_data;
 125   if (idata->registered)
 126     return TRUE;
 127
 128   silc_server_command_send_status_reply(cmd, command,
 129                                         SILC_STATUS_ERR_NOT_REGISTERED);
 130   silc_server_command_free(cmd);
 131   return FALSE;
 132 }
 133
 134 /* Internal context to hold data when executed command with timeout. */
 135 typedef struct {
 136   SilcServerCommandContext ctx;
 137   SilcServerCommand *cmd;
 138 } *SilcServerCommandTimeout;
 139
 140 /* Timeout callback to process commands with timeout for client. Client's
 141    commands are always executed with timeout. */
 142
 143 SILC_TASK_CALLBACK(silc_server_command_process_timeout)
 144 {
 145   SilcServerCommandTimeout timeout = (SilcServerCommandTimeout)context;
 146   SilcClientEntry client = (SilcClientEntry)timeout->ctx->sock->user_data;
 147
 148   /* Update access time */
 149   client->last_command = time(NULL);
 150
 151   if (!(timeout->cmd->flags & SILC_CF_REG))
 152     timeout->cmd->cb(timeout->ctx, NULL);
 153   else if (silc_server_is_registered(timeout->ctx->server,
 154                                      timeout->ctx->sock,
 155                                      timeout->ctx,
 156                                      timeout->cmd->cmd))
 157     timeout->cmd->cb(timeout->ctx, NULL);
 158
 159   silc_free(timeout);
 160 }
 161
 162 /* Processes received command packet. */
 163
 164 void silc_server_command_process(SilcServer server,
 165                                  SilcSocketConnection sock,
 166                                  SilcPacketContext *packet)
 167 {
 168   SilcServerCommandContext ctx;
 169   SilcServerCommand *cmd;
 170   SilcCommand command;
 171
 172   /* Allocate command context. This must be free'd by the
 173      command routine receiving it. */
 174   ctx = silc_server_command_alloc();
 175   ctx->server = server;
 176   ctx->sock = silc_socket_dup(sock);
 177   ctx->packet = silc_packet_context_dup(packet); /* Save original packet */
 178
 179   /* Parse the command payload in the packet */
 180   ctx->payload = silc_command_payload_parse(packet->buffer);
 181   if (!ctx->payload) {
 182     SILC_LOG_ERROR(("Bad command payload, packet dropped"));
 183     silc_buffer_free(packet->buffer);
 184     silc_packet_context_free(packet);
 185     silc_socket_free(ctx->sock);
 186     silc_free(ctx);
 187     return;
 188   }
 189   ctx->args = silc_command_get_args(ctx->payload);
 190
 191   /* Get the command */
 192   command = silc_command_get(ctx->payload);
 193   for (cmd = silc_command_list; cmd->cb; cmd++)
 194     if (cmd->cmd == command)
 195       break;
 196
 197   if (cmd == NULL) {
 198     silc_server_command_send_status_reply(ctx, command,
 199                                           SILC_STATUS_ERR_UNKNOWN_COMMAND);
 200     silc_server_command_free(ctx);
 201     return;
 202   }
 203
 204   /* Execute client's commands always with timeout.  Normally they are
 205      executed with zero (0) timeout but if client is sending command more
 206      frequently than once in 2 seconds, then the timeout may be 0 to 2
 207      seconds. */
 208   if (sock->type == SILC_SOCKET_TYPE_CLIENT) {
 209     SilcClientEntry client = (SilcClientEntry)sock->user_data;
 210     SilcServerCommandTimeout timeout = silc_calloc(1, sizeof(*timeout));
 211     int fast;
 212
 213     timeout->ctx = ctx;
 214     timeout->cmd = cmd;
 215
 216     if (client->last_command && (time(NULL) - client->last_command) < 2) {
 217       client->fast_command++;
 218       fast = FALSE;
 219     } else {
 220       client->fast_command = ((client->fast_command - 1) <= 0 ? 0 :
 221                               client->fast_command--);
 222       fast = TRUE;
 223     }
 224
 225     if (!fast && ((cmd->flags & SILC_CF_LAG_STRICT) ||
 226                   (client->fast_command > 5 && cmd->flags & SILC_CF_LAG)))
 227       silc_schedule_task_add(server->schedule, sock->sock,
 228                          silc_server_command_process_timeout,
 229                          (void *)timeout,
 230                          2 - (time(NULL) - client->last_command), 0,
 231                          SILC_TASK_TIMEOUT,
 232                          SILC_TASK_PRI_NORMAL);
 233     else
 234       silc_schedule_task_add(server->schedule, sock->sock,
 235                          silc_server_command_process_timeout,
 236                          (void *)timeout,
 237                          0, 1,
 238                          SILC_TASK_TIMEOUT,
 239                          SILC_TASK_PRI_NORMAL);
 240     return;
 241   }
 242
 243   /* Execute for server */
 244
 245   if (!(cmd->flags & SILC_CF_REG))
 246     cmd->cb(ctx, NULL);
 247   else if (silc_server_is_registered(server, sock, ctx, cmd->cmd))
 248     cmd->cb(ctx, NULL);
 249 }
 250
 251 /* Allocate Command Context */
 252
 253 SilcServerCommandContext silc_server_command_alloc()
 254 {
 255   SilcServerCommandContext ctx = silc_calloc(1, sizeof(*ctx));
 256   ctx->users++;
 257   return ctx;
 258 }
 259
 260 /* Free's the command context allocated before executing the command */
 261
 262 void silc_server_command_free(SilcServerCommandContext ctx)
 263 {
 264   ctx->users--;
 265   SILC_LOG_DEBUG(("Command context %p refcnt %d->%d", ctx, ctx->users + 1,
 266                   ctx->users));
 267   if (ctx->users < 1) {
 268     if (ctx->payload)
 269       silc_command_payload_free(ctx->payload);
 270     if (ctx->packet)
 271       silc_packet_context_free(ctx->packet);
 272     if (ctx->sock)
 273       silc_socket_free(ctx->sock); /* Decrease reference counter */
 274     silc_free(ctx);
 275   }
 276 }
 277
 278 /* Duplicate Command Context by adding reference counter. The context won't
 279    be free'd untill it hits zero. */
 280
 281 SilcServerCommandContext
 282 silc_server_command_dup(SilcServerCommandContext ctx)
 283 {
 284   ctx->users++;
 285   SILC_LOG_DEBUG(("Command context %p refcnt %d->%d", ctx, ctx->users - 1,
 286                   ctx->users));
 287   return ctx;
 288 }
 289
 290 /* Add new pending command to be executed when reply to a command has been
 291    received. The `reply_cmd' is the command that will call the `callback'
 292    with `context' when reply has been received.  If `ident' is non-zero
 293    the `callback' will be executed when received reply with command
 294    identifier `ident'. */
 295
 296 void silc_server_command_pending(SilcServer server,
 297                                  SilcCommand reply_cmd,
 298                                  uint16 ident,
 299                                  SilcServerPendingDestructor destructor,
 300                                  SilcCommandCb callback,
 301                                  void *context)
 302 {
 303   SilcServerCommandPending *reply;
 304
 305   reply = silc_calloc(1, sizeof(*reply));
 306   reply->reply_cmd = reply_cmd;
 307   reply->ident = ident;
 308   reply->context = context;
 309   reply->callback = callback;
 310   reply->destructor = destructor;
 311   silc_dlist_add(server->pending_commands, reply);
 312 }
 313
 314 /* Deletes pending command by reply command type. */
 315
 316 void silc_server_command_pending_del(SilcServer server,
 317                                      SilcCommand reply_cmd,
 318                                      uint16 ident)
 319 {
 320   SilcServerCommandPending *r;
 321
 322   silc_dlist_start(server->pending_commands);
 323   while ((r = silc_dlist_get(server->pending_commands)) != SILC_LIST_END) {
 324     if (r->reply_cmd == reply_cmd && r->ident == ident) {
 325       silc_dlist_del(server->pending_commands, r);
 326       break;
 327     }
 328   }
 329 }
 330
 331 /* Checks for pending commands and marks callbacks to be called from
 332    the command reply function. Returns TRUE if there were pending command. */
 333
 334 int silc_server_command_pending_check(SilcServer server,
 335                                       SilcServerCommandReplyContext ctx,
 336                                       SilcCommand command,
 337                                       uint16 ident)
 338 {
 339   SilcServerCommandPending *r;
 340
 341   silc_dlist_start(server->pending_commands);
 342   while ((r = silc_dlist_get(server->pending_commands)) != SILC_LIST_END) {
 343     if (r->reply_cmd == command && r->ident == ident) {
 344       ctx->context = r->context;
 345       ctx->callback = r->callback;
 346       ctx->destructor = r->destructor;
 347       ctx->ident = ident;
 348       return TRUE;
 349     }
 350   }
 351
 352   return FALSE;
 353 }
 354
 355 /* Destructor function for pending callbacks. This is called when using
 356    pending commands to free the context given for the pending command. */
 357
 358 static void silc_server_command_destructor(void *context)
 359 {
 360   silc_server_command_free((SilcServerCommandContext)context);
 361 }
 362
 363 /* Sends simple status message as command reply packet */
 364
 365 static void
 366 silc_server_command_send_status_reply(SilcServerCommandContext cmd,
 367                                       SilcCommand command,
 368                                       SilcCommandStatus status)
 369 {
 370   SilcBuffer buffer;
 371
 372   SILC_LOG_DEBUG(("Sending command status %d", status));
 373
 374   buffer =
 375     silc_command_reply_payload_encode_va(command, status,
 376                                          silc_command_get_ident(cmd->payload),
 377                                          0);
 378   silc_server_packet_send(cmd->server, cmd->sock,
 379                           SILC_PACKET_COMMAND_REPLY, 0,
 380                           buffer->data, buffer->len, FALSE);
 381   silc_buffer_free(buffer);
 382 }
 383
 384 /* Sends command status reply with one extra argument. The argument
 385    type must be sent as argument. */
 386
 387 static void
 388 silc_server_command_send_status_data(SilcServerCommandContext cmd,
 389                                      SilcCommand command,
 390                                      SilcCommandStatus status,
 391                                      uint32 arg_type,
 392                                      unsigned char *arg,
 393                                      uint32 arg_len)
 394 {
 395   SilcBuffer buffer;
 396
 397   SILC_LOG_DEBUG(("Sending command status %d", status));
 398
 399   buffer =
 400     silc_command_reply_payload_encode_va(command, status,
 401                                          silc_command_get_ident(cmd->payload),
 402                                          1, arg_type, arg, arg_len);
 403   silc_server_packet_send(cmd->server, cmd->sock,
 404                           SILC_PACKET_COMMAND_REPLY, 0,
 405                           buffer->data, buffer->len, FALSE);
 406   silc_buffer_free(buffer);
 407 }
 408
 409 /* This function can be called to check whether in the command reply
 410    an error occurred. This function has no effect if this is called
 411    when the command function was not called as pending command callback.
 412    This returns TRUE if error had occurred. */
 413
 414 static bool
 415 silc_server_command_pending_error_check(SilcServerCommandContext cmd,
 416                                         SilcServerCommandReplyContext cmdr,
 417                                         SilcCommand command)
 418 {
 419   SilcCommandStatus status;
 420
 421   if (!cmd->pending || !cmdr)
 422     return FALSE;
 423
 424   SILC_GET16_MSB(status, silc_argument_get_arg_type(cmdr->args, 1, NULL));
 425   if (status != SILC_STATUS_OK &&
 426       status != SILC_STATUS_LIST_START &&
 427       status != SILC_STATUS_LIST_ITEM &&
 428       status != SILC_STATUS_LIST_END) {
 429     /* Send the error message */
 430     silc_server_command_send_status_reply(cmd, command, status);
 431     return TRUE;
 432   }
 433
 434   return FALSE;
 435 }
 436
 437 /******************************************************************************
 438
 439                               WHOIS Functions
 440
 441 ******************************************************************************/
 442
 443 static int
 444 silc_server_command_whois_parse(SilcServerCommandContext cmd,
 445                                 SilcClientID ***client_id,
 446                                 uint32 *client_id_count,
 447                                 char **nickname,
 448                                 char **server_name,
 449                                 int *count,
 450                                 SilcCommand command)
 451 {
 452   unsigned char *tmp;
 453   uint32 len;
 454   uint32 argc = silc_argument_get_arg_num(cmd->args);
 455   int i, k;
 456
 457   /* If client ID is in the command it must be used instead of nickname */
 458   tmp = silc_argument_get_arg_type(cmd->args, 3, &len);
 459   if (!tmp) {
 460     /* No ID, get the nickname@server string and parse it. */
 461     tmp = silc_argument_get_arg_type(cmd->args, 1, NULL);
 462     if (tmp) {
 463       if (strchr(tmp, '@')) {
 464         len = strcspn(tmp, "@");
 465         *nickname = silc_calloc(len + 1, sizeof(char));
 466         memcpy(*nickname, tmp, len);
 467         *server_name = silc_calloc(strlen(tmp) - len, sizeof(char));
 468         memcpy(*server_name, tmp + len + 1, strlen(tmp) - len - 1);
 469       } else {
 470         *nickname = strdup(tmp);
 471       }
 472     } else {
 473       silc_server_command_send_status_reply(cmd, command,
 474                                             SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
 475       return FALSE;
 476     }
 477   } else {
 478     /* Command includes ID, we must use that.  Also check whether the command
 479        has more than one ID set - take them all. */
 480
 481     *client_id = silc_calloc(1, sizeof(**client_id));
 482     (*client_id)[0] = silc_id_payload_parse_id(tmp, len);
 483     if ((*client_id)[0] == NULL) {
 484       silc_free(*client_id);
 485       return FALSE;
 486     }
 487     *client_id_count = 1;
 488
 489     /* Take all ID's from the command packet */
 490     if (argc > 1) {
 491       for (k = 1, i = 1; i < argc; i++) {
 492         tmp = silc_argument_get_arg_type(cmd->args, i + 3, &len);
 493         if (tmp) {
 494           *client_id = silc_realloc(*client_id, sizeof(**client_id) *
 495                                     (*client_id_count + 1));
 496           (*client_id)[k] = silc_id_payload_parse_id(tmp, len);
 497           if ((*client_id)[k] == NULL) {
 498             /* Cleanup all and fail */
 499             for (i = 0; i < *client_id_count; i++)
 500               silc_free((*client_id)[i]);
 501             silc_free(*client_id);
 502             return FALSE;
 503           }
 504           (*client_id_count)++;
 505           k++;
 506         }
 507       }
 508     }
 509   }
 510
 511   /* Get the max count of reply messages allowed */
 512   tmp = silc_argument_get_arg_type(cmd->args, 2, NULL);
 513   if (tmp)
 514     *count = atoi(tmp);
 515   else
 516     *count = 0;
 517
 518   return TRUE;
 519 }
 520
 521 static char
 522 silc_server_command_whois_check(SilcServerCommandContext cmd,
 523                                 SilcClientEntry *clients,
 524                                 uint32 clients_count)
 525 {
 526   SilcServer server = cmd->server;
 527   int i;
 528   SilcClientEntry entry;
 529
 530   for (i = 0; i < clients_count; i++) {
 531     entry = clients[i];
 532
 533     if (!entry || entry->data.registered == FALSE)
 534       continue;
 535
 536     if (!entry->nickname || !entry->username || !entry->userinfo) {
 537       SilcBuffer tmpbuf;
 538       uint16 old_ident;
 539
 540       if (!entry->router)
 541         continue;
 542
 543       old_ident = silc_command_get_ident(cmd->payload);
 544       silc_command_set_ident(cmd->payload, silc_rng_get_rn16(server->rng));
 545       tmpbuf = silc_command_payload_encode_payload(cmd->payload);
 546
 547       /* Send WHOIS command */
 548       silc_server_packet_send(server, entry->router->connection,
 549                               SILC_PACKET_COMMAND, cmd->packet->flags,
 550                               tmpbuf->data, tmpbuf->len, TRUE);
 551
 552       /* Reprocess this packet after received reply */
 553       silc_server_command_pending(server, SILC_COMMAND_WHOIS,
 554                                   silc_command_get_ident(cmd->payload),
 555                                   silc_server_command_destructor,
 556                                   silc_server_command_whois,
 557                                   silc_server_command_dup(cmd));
 558       cmd->pending = TRUE;
 559
 560       silc_command_set_ident(cmd->payload, old_ident);
 561
 562       silc_buffer_free(tmpbuf);
 563       return FALSE;
 564     }
 565   }
 566
 567   return TRUE;
 568 }
 569
 570 static void
 571 silc_server_command_whois_send_reply(SilcServerCommandContext cmd,
 572                                      SilcClientEntry *clients,
 573                                      uint32 clients_count,
 574                                      int count)
 575 {
 576   SilcServer server = cmd->server;
 577   char *tmp;
 578   int i, k, len;
 579   SilcBuffer packet, idp, channels;
 580   SilcClientEntry entry;
 581   SilcCommandStatus status;
 582   uint16 ident = silc_command_get_ident(cmd->payload);
 583   char nh[256], uh[256];
 584   unsigned char idle[4], mode[4];
 585   SilcSocketConnection hsock;
 586
 587   len = 0;
 588   for (i = 0; i < clients_count; i++)
 589     if (clients[i]->data.registered)
 590       len++;
 591
 592   status = SILC_STATUS_OK;
 593   if (len > 1)
 594     status = SILC_STATUS_LIST_START;
 595
 596   for (i = 0, k = 0; i < clients_count; i++) {
 597     entry = clients[i];
 598
 599     if (entry->data.registered == FALSE) {
 600       if (clients_count == 1) {
 601         if (entry->nickname) {
 602           silc_server_command_send_status_data(cmd, SILC_COMMAND_WHOIS,
 603                                                SILC_STATUS_ERR_NO_SUCH_NICK,
 604                                                3, entry->nickname,
 605                                                strlen(entry->nickname));
 606         } else {
 607           SilcBuffer idp = silc_id_payload_encode(entry->id, SILC_ID_CLIENT);
 608           silc_server_command_send_status_data(cmd, SILC_COMMAND_WHOIS,
 609                                      SILC_STATUS_ERR_NO_SUCH_CLIENT_ID,
 610                                                2, idp->data, idp->len);
 611           silc_buffer_free(idp);
 612         }
 613       }
 614       continue;
 615     }
 616
 617     if (k >= 1)
 618       status = SILC_STATUS_LIST_ITEM;
 619
 620     if (clients_count > 1 && k == clients_count - 1)
 621       status = SILC_STATUS_LIST_END;
 622
 623     if (count && k - 1 == count)
 624       status = SILC_STATUS_LIST_END;
 625
 626     if (count && k - 1 > count)
 627       break;
 628
 629     /* Sanity check, however these should never fail. However, as
 630        this sanity check has been added here they have failed. */
 631     if (!entry->nickname || !entry->username || !entry->userinfo)
 632       continue;
 633
 634     /* Send WHOIS reply */
 635     idp = silc_id_payload_encode(entry->id, SILC_ID_CLIENT);
 636     tmp = silc_argument_get_first_arg(cmd->args, NULL);
 637
 638     memset(uh, 0, sizeof(uh));
 639     memset(nh, 0, sizeof(nh));
 640     memset(idle, 0, sizeof(idle));
 641
 642     strncat(nh, entry->nickname, strlen(entry->nickname));
 643     if (!strchr(entry->nickname, '@')) {
 644       strncat(nh, "@", 1);
 645       if (entry->servername) {
 646         strncat(nh, entry->servername, strlen(entry->servername));
 647       } else {
 648         len = entry->router ? strlen(entry->router->server_name) :
 649           strlen(server->server_name);
 650         strncat(nh, entry->router ? entry->router->server_name :
 651                 server->server_name, len);
 652       }
 653     }
 654
 655     strncat(uh, entry->username, strlen(entry->username));
 656     if (!strchr(entry->username, '@')) {
 657       strncat(uh, "@", 1);
 658       hsock = (SilcSocketConnection)entry->connection;
 659       len = strlen(hsock->hostname);
 660       strncat(uh, hsock->hostname, len);
 661     }
 662
 663     channels = silc_server_get_client_channel_list(server, entry);
 664
 665     SILC_PUT32_MSB(entry->mode, mode);
 666
 667     if (entry->connection) {
 668       SILC_PUT32_MSB((time(NULL) - entry->data.last_receive), idle);
 669     }
 670
 671     if (channels)
 672       packet = silc_command_reply_payload_encode_va(SILC_COMMAND_WHOIS,
 673                                                     status, ident, 7,
 674                                                     2, idp->data, idp->len,
 675                                                     3, nh, strlen(nh),
 676                                                     4, uh, strlen(uh),
 677                                                     5, entry->userinfo,
 678                                                     strlen(entry->userinfo),
 679                                                     6, channels->data,
 680                                                     channels->len,
 681                                                     7, mode, 4,
 682                                                     8, idle, 4);
 683     else
 684       packet = silc_command_reply_payload_encode_va(SILC_COMMAND_WHOIS,
 685                                                     status, ident, 6,
 686                                                     2, idp->data, idp->len,
 687                                                     3, nh, strlen(nh),
 688                                                     4, uh, strlen(uh),
 689                                                     5, entry->userinfo,
 690                                                     strlen(entry->userinfo),
 691                                                     7, mode, 4,
 692                                                     8, idle, 4);
 693
 694     silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY,
 695                             0, packet->data, packet->len, FALSE);
 696
 697     silc_buffer_free(packet);
 698     silc_buffer_free(idp);
 699     if (channels)
 700       silc_buffer_free(channels);
 701
 702     k++;
 703   }
 704 }
 705
 706 static int
 707 silc_server_command_whois_process(SilcServerCommandContext cmd)
 708 {
 709   SilcServer server = cmd->server;
 710   char *nick = NULL, *server_name = NULL;
 711   int count = 0;
 712   SilcClientEntry *clients = NULL, entry;
 713   SilcClientID **client_id = NULL;
 714   uint32 client_id_count = 0, clients_count = 0;
 715   int i, ret = 0;
 716   bool check_global = FALSE;
 717
 718   /* Protocol dictates that we must always send the received WHOIS request
 719      to our router if we are normal server, so let's do it now unless we
 720      are standalone. We will not send any replies to the client until we
 721      have received reply from the router. */
 722   if (cmd->sock->type == SILC_SOCKET_TYPE_CLIENT &&
 723       server->server_type == SILC_SERVER && !cmd->pending &&
 724       !server->standalone) {
 725     SilcBuffer tmpbuf;
 726     uint16 old_ident;
 727
 728     old_ident = silc_command_get_ident(cmd->payload);
 729     silc_command_set_ident(cmd->payload, silc_rng_get_rn16(server->rng));
 730     tmpbuf = silc_command_payload_encode_payload(cmd->payload);
 731
 732     /* Send WHOIS command to our router */
 733     silc_server_packet_send(server, (SilcSocketConnection)
 734                             server->router->connection,
 735                             SILC_PACKET_COMMAND, cmd->packet->flags,
 736                             tmpbuf->data, tmpbuf->len, TRUE);
 737
 738     /* Reprocess this packet after received reply from router */
 739     silc_server_command_pending(server, SILC_COMMAND_WHOIS,
 740                                 silc_command_get_ident(cmd->payload),
 741                                 silc_server_command_destructor,
 742                                 silc_server_command_whois,
 743                                 silc_server_command_dup(cmd));
 744     cmd->pending = TRUE;
 745
 746     silc_command_set_ident(cmd->payload, old_ident);
 747
 748     silc_buffer_free(tmpbuf);
 749     ret = -1;
 750     goto out;
 751   }
 752
 753   /* We are ready to process the command request. Let's search for the
 754      requested client and send reply to the requesting client. */
 755
 756   if (cmd->sock->type == SILC_SOCKET_TYPE_CLIENT)
 757     check_global = TRUE;
 758   else if (server->server_type == SILC_ROUTER)
 759     check_global = TRUE;
 760
 761   /* Parse the whois request */
 762   if (!silc_server_command_whois_parse(cmd, &client_id, &client_id_count,
 763                                        &nick, &server_name, &count,
 764                                        SILC_COMMAND_WHOIS))
 765     return 0;
 766
 767   /* Get all clients matching that ID or nickname from local list */
 768   if (client_id_count) {
 769     /* Check all Client ID's received in the command packet */
 770     for (i = 0; i < client_id_count; i++) {
 771       entry = silc_idlist_find_client_by_id(server->local_list,
 772                                             client_id[i], NULL);
 773       if (!entry && check_global)
 774         entry = silc_idlist_find_client_by_id(server->global_list,
 775                                               client_id[i], NULL);
 776       if (entry) {
 777         clients = silc_realloc(clients, sizeof(*clients) *
 778                                (clients_count + 1));
 779         clients[clients_count++] = entry;
 780       }
 781     }
 782   } else {
 783     if (!silc_idlist_get_clients_by_hash(server->local_list,
 784                                          nick, server->md5hash,
 785                                          &clients, &clients_count))
 786       silc_idlist_get_clients_by_nickname(server->local_list,
 787                                           nick, server_name,
 788                                           &clients, &clients_count);
 789     if (check_global) {
 790       if (!silc_idlist_get_clients_by_hash(server->global_list,
 791                                            nick, server->md5hash,
 792                                            &clients, &clients_count))
 793         silc_idlist_get_clients_by_nickname(server->global_list,
 794                                             nick, server_name,
 795                                             &clients, &clients_count);
 796     }
 797   }
 798
 799   if (!clients) {
 800     /* Such client(s) really does not exist in the SILC network. */
 801     if (!client_id_count) {
 802       silc_server_command_send_status_data(cmd, SILC_COMMAND_WHOIS,
 803                                            SILC_STATUS_ERR_NO_SUCH_NICK,
 804                                            3, nick, strlen(nick));
 805     } else {
 806       SilcBuffer idp = silc_id_payload_encode(client_id[0], SILC_ID_CLIENT);
 807       silc_server_command_send_status_data(cmd, SILC_COMMAND_WHOIS,
 808                                            SILC_STATUS_ERR_NO_SUCH_CLIENT_ID,
 809                                            2, idp->data, idp->len);
 810       silc_buffer_free(idp);
 811     }
 812     goto out;
 813   }
 814
 815   /* Router always finds the client entry if it exists in the SILC network.
 816      However, it might be incomplete entry and does not include all the
 817      mandatory fields that WHOIS command reply requires. Check for these and
 818      make query from the server who owns the client if some fields are
 819      missing. */
 820   if (!silc_server_command_whois_check(cmd, clients, clients_count)) {
 821     ret = -1;
 822     goto out;
 823   }
 824
 825   /* Send the command reply */
 826   silc_server_command_whois_send_reply(cmd, clients, clients_count,
 827                                        count);
 828
 829  out:
 830   if (client_id_count) {
 831     for (i = 0; i < client_id_count; i++)
 832       silc_free(client_id[i]);
 833     silc_free(client_id);
 834   }
 835   if (clients)
 836     silc_free(clients);
 837   if (nick)
 838     silc_free(nick);
 839   if (server_name)
 840     silc_free(server_name);
 841
 842   return ret;
 843 }
 844
 845 /* Server side of command WHOIS. Processes user's query and sends found
 846    results as command replies back to the client. */
 847
 848 SILC_SERVER_CMD_FUNC(whois)
 849 {
 850   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
 851   int ret = 0;
 852
 853   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_WHOIS, cmd, 1, 3328);
 854
 855   ret = silc_server_command_whois_process(cmd);
 856
 857   if (!ret)
 858     silc_server_command_free(cmd);
 859 }
 860
 861 /******************************************************************************
 862
 863                               WHOWAS Functions
 864
 865 ******************************************************************************/
 866
 867 static int
 868 silc_server_command_whowas_parse(SilcServerCommandContext cmd,
 869                                  char **nickname,
 870                                  char **server_name,
 871                                  int *count)
 872 {
 873   unsigned char *tmp;
 874   uint32 len;
 875
 876   tmp = silc_argument_get_arg_type(cmd->args, 1, &len);
 877   if (!tmp) {
 878     silc_server_command_send_status_reply(cmd, SILC_COMMAND_WHOWAS,
 879                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
 880     return FALSE;
 881   }
 882
 883   /* Get the nickname@server string and parse it. */
 884   if (strchr(tmp, '@')) {
 885     len = strcspn(tmp, "@");
 886     *nickname = silc_calloc(len + 1, sizeof(char));
 887     memcpy(*nickname, tmp, len);
 888     *server_name = silc_calloc(strlen(tmp) - len, sizeof(char));
 889     memcpy(*server_name, tmp + len + 1, strlen(tmp) - len - 1);
 890   } else {
 891     *nickname = strdup(tmp);
 892   }
 893   /* Get the max count of reply messages allowed */
 894   tmp = silc_argument_get_arg_type(cmd->args, 2, NULL);
 895   if (tmp)
 896     *count = atoi(tmp);
 897   else
 898     *count = 0;
 899
 900   return TRUE;
 901 }
 902
 903 static char
 904 silc_server_command_whowas_check(SilcServerCommandContext cmd,
 905                                  SilcClientEntry *clients,
 906                                  uint32 clients_count)
 907 {
 908   SilcServer server = cmd->server;
 909   int i;
 910   SilcClientEntry entry;
 911
 912   for (i = 0; i < clients_count; i++) {
 913     entry = clients[i];
 914
 915     if (!entry->nickname || !entry->username) {
 916       SilcBuffer tmpbuf;
 917       uint16 old_ident;
 918
 919       if (!entry->router)
 920         continue;
 921
 922       old_ident = silc_command_get_ident(cmd->payload);
 923       silc_command_set_ident(cmd->payload, silc_rng_get_rn16(server->rng));
 924       tmpbuf = silc_command_payload_encode_payload(cmd->payload);
 925
 926       /* Send WHOWAS command */
 927       silc_server_packet_send(server, entry->router->connection,
 928                               SILC_PACKET_COMMAND, cmd->packet->flags,
 929                               tmpbuf->data, tmpbuf->len, TRUE);
 930
 931       /* Reprocess this packet after received reply */
 932       silc_server_command_pending(server, SILC_COMMAND_WHOWAS,
 933                                   silc_command_get_ident(cmd->payload),
 934                                   silc_server_command_destructor,
 935                                   silc_server_command_whowas,
 936                                   silc_server_command_dup(cmd));
 937       cmd->pending = TRUE;
 938
 939       silc_command_set_ident(cmd->payload, old_ident);
 940
 941       silc_buffer_free(tmpbuf);
 942       return FALSE;
 943     }
 944   }
 945
 946   return TRUE;
 947 }
 948
 949 static void
 950 silc_server_command_whowas_send_reply(SilcServerCommandContext cmd,
 951                                       SilcClientEntry *clients,
 952                                       uint32 clients_count)
 953 {
 954   SilcServer server = cmd->server;
 955   char *tmp;
 956   int i, count = 0, len;
 957   SilcBuffer packet, idp;
 958   SilcClientEntry entry = NULL;
 959   SilcCommandStatus status;
 960   uint16 ident = silc_command_get_ident(cmd->payload);
 961   char found = FALSE;
 962   char nh[256], uh[256];
 963
 964   status = SILC_STATUS_OK;
 965   if (clients_count > 1)
 966     status = SILC_STATUS_LIST_START;
 967
 968   for (i = 0; i < clients_count; i++) {
 969     entry = clients[i];
 970
 971     /* We will take only clients that are not valid anymore. They are the
 972        ones that are not registered anymore but still have a ID. They
 973        have disconnected us, and thus valid for WHOWAS. */
 974     if (entry->data.registered == TRUE)
 975       continue;
 976     if (entry->id == NULL)
 977       continue;
 978
 979     if (count && i - 1 == count)
 980       break;
 981
 982     found = TRUE;
 983
 984     if (clients_count > 2)
 985       status = SILC_STATUS_LIST_ITEM;
 986
 987     if (clients_count > 1 && i == clients_count - 1)
 988       status = SILC_STATUS_LIST_END;
 989
 990     /* Sanity check, however these should never fail. However, as
 991        this sanity check has been added here they have failed. */
 992     if (!entry->nickname || !entry->username)
 993       continue;
 994
 995     /* Send WHOWAS reply */
 996     idp = silc_id_payload_encode(entry->id, SILC_ID_CLIENT);
 997     tmp = silc_argument_get_first_arg(cmd->args, NULL);
 998
 999     memset(uh, 0, sizeof(uh));
1000     memset(nh, 0, sizeof(nh));
1001
1002     strncat(nh, entry->nickname, strlen(entry->nickname));
1003     if (!strchr(entry->nickname, '@')) {
1004       strncat(nh, "@", 1);
1005       if (entry->servername) {
1006         strncat(nh, entry->servername, strlen(entry->servername));
1007       } else {
1008         len = entry->router ? strlen(entry->router->server_name) :
1009           strlen(server->server_name);
1010         strncat(nh, entry->router ? entry->router->server_name :
1011                 server->server_name, len);
1012       }
1013     }
1014
1015     strncat(uh, entry->username, strlen(entry->username));
1016     if (!strchr(entry->username, '@')) {
1017       strncat(uh, "@", 1);
1018       strcat(uh, "*private*");
1019     }
1020
1021     if (entry->userinfo)
1022       packet =
1023         silc_command_reply_payload_encode_va(SILC_COMMAND_WHOWAS,
1024                                              status, ident, 4,
1025                                              2, idp->data, idp->len,
1026                                              3, nh, strlen(nh),
1027                                              4, uh, strlen(uh),
1028                                              5, entry->userinfo,
1029                                              strlen(entry->userinfo));
1030     else
1031       packet =
1032         silc_command_reply_payload_encode_va(SILC_COMMAND_WHOWAS,
1033                                              status, ident, 3,
1034                                              2, idp->data, idp->len,
1035                                              3, nh, strlen(nh),
1036                                              4, uh, strlen(uh));
1037
1038     silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY,
1039                             0, packet->data, packet->len, FALSE);
1040
1041     silc_buffer_free(packet);
1042     silc_buffer_free(idp);
1043   }
1044
1045   if (found == FALSE && entry)
1046     silc_server_command_send_status_data(cmd, SILC_COMMAND_WHOWAS,
1047                                          SILC_STATUS_ERR_NO_SUCH_NICK,
1048                                          3, entry->nickname,
1049                                          strlen(entry->nickname));
1050 }
1051
1052 static int
1053 silc_server_command_whowas_process(SilcServerCommandContext cmd)
1054 {
1055   SilcServer server = cmd->server;
1056   char *nick = NULL, *server_name = NULL;
1057   int count = 0;
1058   SilcClientEntry *clients = NULL;
1059   uint32 clients_count = 0;
1060   int ret = 0;
1061   bool check_global = FALSE;
1062
1063   /* Protocol dictates that we must always send the received WHOWAS request
1064      to our router if we are normal server, so let's do it now unless we
1065      are standalone. We will not send any replies to the client until we
1066      have received reply from the router. */
1067   if (cmd->sock->type == SILC_SOCKET_TYPE_CLIENT &&
1068       server->server_type == SILC_SERVER && !cmd->pending &&
1069       !server->standalone) {
1070     SilcBuffer tmpbuf;
1071     uint16 old_ident;
1072
1073     old_ident = silc_command_get_ident(cmd->payload);
1074     silc_command_set_ident(cmd->payload, silc_rng_get_rn16(server->rng));
1075     tmpbuf = silc_command_payload_encode_payload(cmd->payload);
1076
1077     /* Send WHOWAS command to our router */
1078     silc_server_packet_send(server, (SilcSocketConnection)
1079                             server->router->connection,
1080                             SILC_PACKET_COMMAND, cmd->packet->flags,
1081                             tmpbuf->data, tmpbuf->len, TRUE);
1082
1083     /* Reprocess this packet after received reply from router */
1084     silc_server_command_pending(server, SILC_COMMAND_WHOWAS,
1085                                 silc_command_get_ident(cmd->payload),
1086                                 silc_server_command_destructor,
1087                                 silc_server_command_whowas,
1088                                 silc_server_command_dup(cmd));
1089     cmd->pending = TRUE;
1090
1091     silc_command_set_ident(cmd->payload, old_ident);
1092
1093     silc_buffer_free(tmpbuf);
1094     ret = -1;
1095     goto out;
1096   }
1097
1098   /* We are ready to process the command request. Let's search for the
1099      requested client and send reply to the requesting client. */
1100
1101   if (cmd->sock->type == SILC_SOCKET_TYPE_CLIENT)
1102     check_global = TRUE;
1103   else if (server->server_type == SILC_ROUTER)
1104     check_global = TRUE;
1105
1106   /* Parse the whowas request */
1107   if (!silc_server_command_whowas_parse(cmd, &nick, &server_name, &count))
1108     return 0;
1109
1110   /* Get all clients matching that nickname from local list */
1111   if (!silc_idlist_get_clients_by_nickname(server->local_list,
1112                                            nick, server_name,
1113                                            &clients, &clients_count))
1114     silc_idlist_get_clients_by_hash(server->local_list,
1115                                     nick, server->md5hash,
1116                                     &clients, &clients_count);
1117
1118   /* Check global list as well */
1119   if (check_global) {
1120     if (!silc_idlist_get_clients_by_nickname(server->global_list,
1121                                              nick, server_name,
1122                                              &clients, &clients_count))
1123       silc_idlist_get_clients_by_hash(server->global_list,
1124                                       nick, server->md5hash,
1125                                       &clients, &clients_count);
1126   }
1127
1128   if (!clients) {
1129     /* Such a client really does not exist in the SILC network. */
1130     silc_server_command_send_status_data(cmd, SILC_COMMAND_WHOWAS,
1131                                          SILC_STATUS_ERR_NO_SUCH_NICK,
1132                                          3, nick, strlen(nick));
1133     goto out;
1134   }
1135
1136   if (cmd->sock->type == SILC_SOCKET_TYPE_CLIENT &&
1137       !silc_server_command_whowas_check(cmd, clients, clients_count)) {
1138     ret = -1;
1139     goto out;
1140   }
1141
1142   /* Send the command reply to the client */
1143   silc_server_command_whowas_send_reply(cmd, clients, clients_count);
1144
1145  out:
1146   if (clients)
1147     silc_free(clients);
1148   if (nick)
1149     silc_free(nick);
1150   if (server_name)
1151     silc_free(server_name);
1152
1153   return ret;
1154 }
1155
1156 /* Server side of command WHOWAS. */
1157
1158 SILC_SERVER_CMD_FUNC(whowas)
1159 {
1160   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
1161   int ret = 0;
1162
1163   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_WHOWAS, cmd, 1, 2);
1164
1165   ret = silc_server_command_whowas_process(cmd);
1166
1167   if (!ret)
1168     silc_server_command_free(cmd);
1169 }
1170
1171 /******************************************************************************
1172
1173                               IDENTIFY Functions
1174
1175 ******************************************************************************/
1176
1177 static bool
1178 silc_server_command_identify_parse(SilcServerCommandContext cmd,
1179                                    SilcClientEntry **clients,
1180                                    uint32 *clients_count,
1181                                    SilcServerEntry **servers,
1182                                    uint32 *servers_count,
1183                                    SilcChannelEntry **channels,
1184                                    uint32 *channels_count,
1185                                    uint32 *count)
1186 {
1187   SilcServer server = cmd->server;
1188   unsigned char *tmp;
1189   uint32 len;
1190   uint32 argc = silc_argument_get_arg_num(cmd->args);
1191   SilcIDPayload idp;
1192   bool check_global = FALSE;
1193   void *entry;
1194   int i;
1195   bool error = FALSE;
1196
1197   if (cmd->sock->type == SILC_SOCKET_TYPE_CLIENT)
1198     check_global = TRUE;
1199   else if (server->server_type == SILC_ROUTER)
1200     check_global = TRUE;
1201
1202   /* If ID Payload is in the command it must be used instead of names */
1203   tmp = silc_argument_get_arg_type(cmd->args, 5, &len);
1204   if (!tmp) {
1205     /* No ID, get the names. */
1206
1207     /* Try to get nickname@server. */
1208     tmp = silc_argument_get_arg_type(cmd->args, 1, NULL);
1209     if (tmp) {
1210       char *nick = NULL;
1211       char *nick_server = NULL;
1212
1213       if (strchr(tmp, '@')) {
1214         len = strcspn(tmp, "@");
1215         nick = silc_calloc(len + 1, sizeof(char));
1216         memcpy(nick, tmp, len);
1217         nick_server = silc_calloc(strlen(tmp) - len, sizeof(char));
1218         memcpy(nick_server, tmp + len + 1, strlen(tmp) - len - 1);
1219       } else {
1220         nick = strdup(tmp);
1221       }
1222
1223       if (!silc_idlist_get_clients_by_hash(server->local_list,
1224                                            nick, server->md5hash,
1225                                            clients, clients_count))
1226         silc_idlist_get_clients_by_nickname(server->local_list,
1227                                             nick, nick_server,
1228                                             clients, clients_count);
1229       if (check_global) {
1230         if (!silc_idlist_get_clients_by_hash(server->global_list,
1231                                              nick, server->md5hash,
1232                                              clients, clients_count))
1233           silc_idlist_get_clients_by_nickname(server->global_list,
1234                                               nick, nick_server,
1235                                               clients, clients_count);
1236       }
1237
1238       silc_free(nick);
1239       silc_free(nick_server);
1240
1241       if (!(*clients)) {
1242         silc_server_command_send_status_data(cmd, SILC_COMMAND_IDENTIFY,
1243                                              SILC_STATUS_ERR_NO_SUCH_NICK,
1244                                              3, tmp, strlen(tmp));
1245         return FALSE;
1246       }
1247     }
1248
1249     /* Try to get server name */
1250     tmp = silc_argument_get_arg_type(cmd->args, 2, NULL);
1251     if (tmp) {
1252       entry = silc_idlist_find_server_by_name(server->local_list,
1253                                               tmp, NULL);
1254       if (!entry && check_global)
1255         entry = silc_idlist_find_server_by_name(server->local_list,
1256                                                 tmp, NULL);
1257       if (entry) {
1258         *servers = silc_realloc(*servers, sizeof(**servers) *
1259                                 (*servers_count + 1));
1260         (*servers)[(*servers_count)++] = entry;
1261       }
1262
1263       if (!(*servers)) {
1264         silc_server_command_send_status_data(cmd, SILC_COMMAND_IDENTIFY,
1265                                              SILC_STATUS_ERR_NO_SUCH_SERVER,
1266                                              3, tmp, strlen(tmp));
1267         return FALSE;
1268       }
1269     }
1270
1271     /* Try to get channel name */
1272     tmp = silc_argument_get_arg_type(cmd->args, 3, NULL);
1273     if (tmp) {
1274       entry = silc_idlist_find_channel_by_name(server->local_list,
1275                                                tmp, NULL);
1276       if (!entry && check_global)
1277         entry = silc_idlist_find_channel_by_name(server->local_list,
1278                                                  tmp, NULL);
1279       if (entry) {
1280         *channels = silc_realloc(*channels, sizeof(**channels) *
1281                                  (*channels_count + 1));
1282         (*channels)[(*channels_count)++] = entry;
1283       }
1284
1285       if (!(*channels)) {
1286         silc_server_command_send_status_data(cmd, SILC_COMMAND_IDENTIFY,
1287                                              SILC_STATUS_ERR_NO_SUCH_CHANNEL,
1288                                              3, tmp, strlen(tmp));
1289         return FALSE;
1290       }
1291     }
1292
1293     if (!(*clients) && !(*servers) && !(*channels)) {
1294       silc_server_command_send_status_reply(cmd, SILC_COMMAND_IDENTIFY,
1295                                             SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
1296       return FALSE;
1297     }
1298   } else {
1299     /* Command includes ID, we must use that.  Also check whether the command
1300        has more than one ID set - take them all. */
1301
1302     /* Take all ID's from the command packet */
1303     for (i = 0; i < argc; i++) {
1304       void *id;
1305
1306       tmp = silc_argument_get_arg_type(cmd->args, i + 5, &len);
1307       if (!tmp)
1308         continue;
1309
1310       idp = silc_id_payload_parse_data(tmp, len);
1311       if (!idp) {
1312         silc_free(*clients);
1313         silc_free(*servers);
1314         silc_free(*channels);
1315         silc_server_command_send_status_reply(cmd, SILC_COMMAND_IDENTIFY,
1316                                       SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
1317         return FALSE;
1318       }
1319
1320       id = silc_id_payload_get_id(idp);
1321
1322       switch (silc_id_payload_get_type(idp)) {
1323
1324       case SILC_ID_CLIENT:
1325         entry = (void *)silc_idlist_find_client_by_id(server->local_list,
1326                                                       id, NULL);
1327         if (!entry && check_global)
1328           entry = (void *)silc_idlist_find_client_by_id(server->global_list,
1329                                                         id, NULL);
1330         if (entry) {
1331           *clients = silc_realloc(*clients, sizeof(**clients) *
1332                                   (*clients_count + 1));
1333           (*clients)[(*clients_count)++] = (SilcClientEntry)entry;
1334         } else {
1335           silc_server_command_send_status_data(cmd, SILC_COMMAND_IDENTIFY,
1336                                         SILC_STATUS_ERR_NO_SUCH_CLIENT_ID,
1337                                                2, tmp, len);
1338           error = TRUE;
1339         }
1340
1341         break;
1342
1343       case SILC_ID_SERVER:
1344         entry = (void *)silc_idlist_find_server_by_id(server->local_list,
1345                                                       id, NULL);
1346         if (!entry && check_global)
1347           entry = (void *)silc_idlist_find_server_by_id(server->global_list,
1348                                                         id, NULL);
1349         if (entry) {
1350           *servers = silc_realloc(*servers, sizeof(**servers) *
1351                                   (*servers_count + 1));
1352           (*servers)[(*servers_count)++] = (SilcServerEntry)entry;
1353         } else {
1354           silc_server_command_send_status_data(cmd, SILC_COMMAND_IDENTIFY,
1355                                         SILC_STATUS_ERR_NO_SUCH_SERVER_ID,
1356                                                2, tmp, len);
1357           error = TRUE;
1358         }
1359         break;
1360
1361       case SILC_ID_CHANNEL:
1362         entry = (void *)silc_idlist_find_channel_by_id(server->local_list,
1363                                                        id, NULL);
1364         if (!entry && check_global)
1365           entry = (void *)silc_idlist_find_channel_by_id(server->global_list,
1366                                                          id, NULL);
1367         if (entry) {
1368           *channels = silc_realloc(*channels, sizeof(**channels) *
1369                                    (*channels_count + 1));
1370           (*channels)[(*channels_count)++] = (SilcChannelEntry)entry;
1371         } else {
1372           silc_server_command_send_status_data(cmd, SILC_COMMAND_IDENTIFY,
1373                                         SILC_STATUS_ERR_NO_SUCH_CHANNEL_ID,
1374                                                2, tmp, len);
1375           error = TRUE;
1376         }
1377         break;
1378       }
1379
1380       silc_free(id);
1381     }
1382   }
1383
1384   if (error) {
1385     silc_free(*clients);
1386     silc_free(*servers);
1387     silc_free(*channels);
1388     return FALSE;
1389   }
1390
1391   /* Get the max count of reply messages allowed */
1392   tmp = silc_argument_get_arg_type(cmd->args, 4, NULL);
1393   if (tmp)
1394     *count = atoi(tmp);
1395   else
1396     *count = 0;
1397
1398   return TRUE;
1399 }
1400
1401 /* Checks that all mandatory fields in client entry are present. If not
1402    then send WHOIS request to the server who owns the client. We use
1403    WHOIS because we want to get as much information as possible at once. */
1404
1405 static char
1406 silc_server_command_identify_check_client(SilcServerCommandContext cmd,
1407                                           SilcClientEntry *clients,
1408                                           uint32 clients_count)
1409 {
1410   SilcServer server = cmd->server;
1411   int i;
1412   SilcClientEntry entry;
1413
1414   for (i = 0; i < clients_count; i++) {
1415     entry = clients[i];
1416
1417     if (!entry || entry->data.registered == FALSE)
1418       continue;
1419
1420     if (!entry->nickname) {
1421       SilcBuffer tmpbuf;
1422       uint16 old_ident;
1423
1424       if (!entry->router)
1425         continue;
1426
1427       old_ident = silc_command_get_ident(cmd->payload);
1428       silc_command_set_ident(cmd->payload, silc_rng_get_rn16(server->rng));
1429       silc_command_set_command(cmd->payload, SILC_COMMAND_WHOIS);
1430       tmpbuf = silc_command_payload_encode_payload(cmd->payload);
1431
1432       /* Send WHOIS request. We send WHOIS since we're doing the requesting
1433          now anyway so make it a good one. */
1434       silc_server_packet_send(server, entry->router->connection,
1435                               SILC_PACKET_COMMAND, cmd->packet->flags,
1436                               tmpbuf->data, tmpbuf->len, TRUE);
1437
1438       /* Reprocess this packet after received reply */
1439       silc_server_command_pending(server, SILC_COMMAND_WHOIS,
1440                                   silc_command_get_ident(cmd->payload),
1441                                   silc_server_command_destructor,
1442                                   silc_server_command_identify,
1443                                   silc_server_command_dup(cmd));
1444
1445       cmd->pending = TRUE;
1446
1447       /* Put old data back to the Command Payload we just changed */
1448       silc_command_set_ident(cmd->payload, old_ident);
1449       silc_command_set_command(cmd->payload, SILC_COMMAND_IDENTIFY);
1450
1451       silc_buffer_free(tmpbuf);
1452       return FALSE;
1453     }
1454   }
1455
1456   return TRUE;
1457 }
1458
1459 static void
1460 silc_server_command_identify_send_reply(SilcServerCommandContext cmd,
1461                                         SilcClientEntry *clients,
1462                                         uint32 clients_count,
1463                                         SilcServerEntry *servers,
1464                                         uint32 servers_count,
1465                                         SilcChannelEntry *channels,
1466                                         uint32 channels_count,
1467                                         int count)
1468 {
1469   SilcServer server = cmd->server;
1470   int i, k, len;
1471   SilcBuffer packet, idp;
1472   SilcCommandStatus status;
1473   uint16 ident = silc_command_get_ident(cmd->payload);
1474   char nh[256], uh[256];
1475   SilcSocketConnection hsock;
1476
1477   status = SILC_STATUS_OK;
1478
1479   if (clients) {
1480     SilcClientEntry entry;
1481
1482     len = 0;
1483     for (i = 0; i < clients_count; i++)
1484       if (clients[i]->data.registered)
1485         len++;
1486
1487     if (len > 1)
1488       status = SILC_STATUS_LIST_START;
1489
1490     for (i = 0, k = 0; i < clients_count; i++) {
1491       entry = clients[i];
1492
1493       if (entry->data.registered == FALSE) {
1494         if (clients_count == 1) {
1495           SilcBuffer idp = silc_id_payload_encode(entry->id, SILC_ID_CLIENT);
1496           silc_server_command_send_status_data(cmd, SILC_COMMAND_IDENTIFY,
1497                                         SILC_STATUS_ERR_NO_SUCH_CLIENT_ID,
1498                                                2, idp->data, idp->len);
1499           silc_buffer_free(idp);
1500         }
1501         continue;
1502       }
1503
1504       if (k >= 1)
1505         status = SILC_STATUS_LIST_ITEM;
1506       if (clients_count > 1 && k == clients_count - 1
1507           && !servers_count && !channels_count)
1508         status = SILC_STATUS_LIST_END;
1509       if (count && k - 1 == count)
1510         status = SILC_STATUS_LIST_END;
1511       if (count && k - 1 > count)
1512         break;
1513
1514       /* Send IDENTIFY reply */
1515       idp = silc_id_payload_encode(entry->id, SILC_ID_CLIENT);
1516
1517       memset(uh, 0, sizeof(uh));
1518       memset(nh, 0, sizeof(nh));
1519
1520       strncat(nh, entry->nickname, strlen(entry->nickname));
1521       if (!strchr(entry->nickname, '@')) {
1522         strncat(nh, "@", 1);
1523         if (entry->servername) {
1524           strncat(nh, entry->servername, strlen(entry->servername));
1525         } else {
1526           len = entry->router ? strlen(entry->router->server_name) :
1527             strlen(server->server_name);
1528           strncat(nh, entry->router ? entry->router->server_name :
1529                   server->server_name, len);
1530         }
1531       }
1532
1533       if (!entry->username) {
1534         packet = silc_command_reply_payload_encode_va(SILC_COMMAND_IDENTIFY,
1535                                                       status, ident, 2,
1536                                                       2, idp->data, idp->len,
1537                                                       3, nh, strlen(nh));
1538       } else {
1539         strncat(uh, entry->username, strlen(entry->username));
1540         if (!strchr(entry->username, '@')) {
1541           strncat(uh, "@", 1);
1542           hsock = (SilcSocketConnection)entry->connection;
1543           len = strlen(hsock->hostname);
1544           strncat(uh, hsock->hostname, len);
1545         }
1546
1547         packet = silc_command_reply_payload_encode_va(SILC_COMMAND_IDENTIFY,
1548                                                       status, ident, 3,
1549                                                       2, idp->data, idp->len,
1550                                                       3, nh, strlen(nh),
1551                                                       4, uh, strlen(uh));
1552       }
1553
1554       silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY,
1555                               0, packet->data, packet->len, FALSE);
1556
1557       silc_buffer_free(packet);
1558       silc_buffer_free(idp);
1559
1560       k++;
1561     }
1562   }
1563
1564   status = (status == SILC_STATUS_LIST_ITEM ?
1565             SILC_STATUS_LIST_ITEM : SILC_STATUS_OK);
1566
1567   if (servers) {
1568     SilcServerEntry entry;
1569
1570     if (status == SILC_STATUS_OK && servers_count > 1)
1571       status = SILC_STATUS_LIST_START;
1572
1573     for (i = 0, k = 0; i < servers_count; i++) {
1574       entry = servers[i];
1575
1576       if (k >= 1)
1577         status = SILC_STATUS_LIST_ITEM;
1578       if (servers_count > 1 && k == servers_count - 1 && !channels_count)
1579         status = SILC_STATUS_LIST_END;
1580       if (count && k - 1 == count)
1581         status = SILC_STATUS_LIST_END;
1582       if (count && k - 1 > count)
1583         break;
1584
1585       /* Send IDENTIFY reply */
1586       idp = silc_id_payload_encode(entry->id, SILC_ID_SERVER);
1587       if (entry->server_name) {
1588         packet =
1589           silc_command_reply_payload_encode_va(SILC_COMMAND_IDENTIFY,
1590                                                status, ident, 2,
1591                                                2, idp->data, idp->len,
1592                                                3, entry->server_name,
1593                                                strlen(entry->server_name));
1594       } else {
1595         packet = silc_command_reply_payload_encode_va(SILC_COMMAND_IDENTIFY,
1596                                                       status, ident, 1,
1597                                                       2, idp->data, idp->len);
1598       }
1599
1600       silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY,
1601                               0, packet->data, packet->len, FALSE);
1602
1603       silc_buffer_free(packet);
1604       silc_buffer_free(idp);
1605
1606       k++;
1607     }
1608   }
1609
1610   status = (status == SILC_STATUS_LIST_ITEM ?
1611             SILC_STATUS_LIST_ITEM : SILC_STATUS_OK);
1612
1613   if (channels) {
1614     SilcChannelEntry entry;
1615
1616     if (status == SILC_STATUS_OK && channels_count > 1)
1617       status = SILC_STATUS_LIST_START;
1618
1619     for (i = 0, k = 0; i < channels_count; i++) {
1620       entry = channels[i];
1621
1622       if (k >= 1)
1623         status = SILC_STATUS_LIST_ITEM;
1624       if (channels_count > 1 && k == channels_count - 1)
1625         status = SILC_STATUS_LIST_END;
1626       if (count && k - 1 == count)
1627         status = SILC_STATUS_LIST_END;
1628       if (count && k - 1 > count)
1629         break;
1630
1631       /* Send IDENTIFY reply */
1632       idp = silc_id_payload_encode(entry->id, SILC_ID_CHANNEL);
1633       if (entry->channel_name) {
1634         packet =
1635           silc_command_reply_payload_encode_va(SILC_COMMAND_IDENTIFY,
1636                                                status, ident, 2,
1637                                                2, idp->data, idp->len,
1638                                                3, entry->channel_name,
1639                                                strlen(entry->channel_name));
1640       } else {
1641         packet = silc_command_reply_payload_encode_va(SILC_COMMAND_IDENTIFY,
1642                                                       status, ident, 1,
1643                                                       2, idp->data, idp->len);
1644       }
1645
1646       silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY,
1647                               0, packet->data, packet->len, FALSE);
1648
1649       silc_buffer_free(packet);
1650       silc_buffer_free(idp);
1651
1652       k++;
1653     }
1654   }
1655 }
1656
1657 static int
1658 silc_server_command_identify_process(SilcServerCommandContext cmd)
1659 {
1660   SilcServer server = cmd->server;
1661   uint32 count = 0;
1662   int ret = 0;
1663   SilcClientEntry *clients = NULL;
1664   SilcServerEntry *servers = NULL;
1665   SilcChannelEntry *channels = NULL;
1666   uint32 clients_count = 0, servers_count = 0, channels_count = 0;
1667
1668   /* Protocol dictates that we must always send the received IDENTIFY request
1669      to our router if we are normal server, so let's do it now unless we
1670      are standalone. We will not send any replies to the client until we
1671      have received reply from the router. */
1672   if (cmd->sock->type == SILC_SOCKET_TYPE_CLIENT &&
1673       server->server_type == SILC_SERVER && !cmd->pending &&
1674       !server->standalone) {
1675     SilcBuffer tmpbuf;
1676     uint16 old_ident;
1677
1678     old_ident = silc_command_get_ident(cmd->payload);
1679     silc_command_set_ident(cmd->payload, silc_rng_get_rn16(server->rng));
1680     tmpbuf = silc_command_payload_encode_payload(cmd->payload);
1681
1682     /* Send IDENTIFY command to our router */
1683     silc_server_packet_send(server, (SilcSocketConnection)
1684                             server->router->connection,
1685                             SILC_PACKET_COMMAND, cmd->packet->flags,
1686                             tmpbuf->data, tmpbuf->len, TRUE);
1687
1688     /* Reprocess this packet after received reply from router */
1689     silc_server_command_pending(server, SILC_COMMAND_IDENTIFY,
1690                                 silc_command_get_ident(cmd->payload),
1691                                 silc_server_command_destructor,
1692                                 silc_server_command_identify,
1693                                 silc_server_command_dup(cmd));
1694     cmd->pending = TRUE;
1695
1696     silc_command_set_ident(cmd->payload, old_ident);
1697
1698     silc_buffer_free(tmpbuf);
1699     ret = -1;
1700     goto out;
1701   }
1702
1703   /* We are ready to process the command request. Let's search for the
1704      requested client and send reply to the requesting client. */
1705
1706   /* Parse the IDENTIFY request */
1707   if (!silc_server_command_identify_parse(cmd,
1708                                           &clients, &clients_count,
1709                                           &servers, &servers_count,
1710                                           &channels, &channels_count,
1711                                           &count))
1712     return 0;
1713
1714   /* Check that all mandatory fields are present and request those data
1715      from the server who owns the client if necessary. */
1716   if (clients && !silc_server_command_identify_check_client(cmd, clients,
1717                                                             clients_count)) {
1718     ret = -1;
1719     goto out;
1720   }
1721
1722   /* Send the command reply to the client */
1723   silc_server_command_identify_send_reply(cmd,
1724                                           clients, clients_count,
1725                                           servers, servers_count,
1726                                           channels, channels_count,
1727                                           count);
1728
1729  out:
1730   silc_free(clients);
1731   silc_free(servers);
1732   silc_free(channels);
1733
1734   return ret;
1735 }
1736
1737 SILC_SERVER_CMD_FUNC(identify)
1738 {
1739   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
1740   int ret = 0;
1741
1742   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_IDENTIFY, cmd, 1, 3328);
1743
1744   ret = silc_server_command_identify_process(cmd);
1745
1746   if (!ret)
1747     silc_server_command_free(cmd);
1748 }
1749
1750 /* Checks string for bad characters and returns TRUE if they are found. */
1751
1752 static int silc_server_command_bad_chars(char *nick)
1753 {
1754   if (strchr(nick, '\\')) return TRUE;
1755   if (strchr(nick, '\"')) return TRUE;
1756   if (strchr(nick, '´')) return TRUE;
1757   if (strchr(nick, '`')) return TRUE;
1758   if (strchr(nick, '\'')) return TRUE;
1759   if (strchr(nick, '*')) return TRUE;
1760   if (strchr(nick, '/')) return TRUE;
1761   if (strchr(nick, '@')) return TRUE;
1762
1763   return FALSE;
1764 }
1765
1766 /* Server side of command NICK. Sets nickname for user. Setting
1767    nickname causes generation of a new client ID for the client. The
1768    new client ID is sent to the client after changing the nickname. */
1769
1770 SILC_SERVER_CMD_FUNC(nick)
1771 {
1772   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
1773   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
1774   SilcServer server = cmd->server;
1775   SilcBuffer packet, nidp, oidp;
1776   SilcClientID *new_id;
1777   char *nick;
1778   uint16 ident = silc_command_get_ident(cmd->payload);
1779
1780   if (cmd->sock->type != SILC_SOCKET_TYPE_CLIENT)
1781     goto out;
1782
1783   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_NICK, cmd, 1, 1);
1784
1785   /* Check nickname */
1786   nick = silc_argument_get_arg_type(cmd->args, 1, NULL);
1787   if (silc_server_command_bad_chars(nick) == TRUE) {
1788     silc_server_command_send_status_reply(cmd, SILC_COMMAND_NICK,
1789                                           SILC_STATUS_ERR_BAD_NICKNAME);
1790     goto out;
1791   }
1792
1793   if (strlen(nick) > 128)
1794     nick[127] = '\0';
1795
1796   /* Create new Client ID */
1797   silc_id_create_client_id(cmd->server->id, cmd->server->rng,
1798                            cmd->server->md5hash, nick,
1799                            &new_id);
1800
1801   /* Send notify about nickname change to our router. We send the new
1802      ID and ask to replace it with the old one. If we are router the
1803      packet is broadcasted. Send NICK_CHANGE notify. */
1804   if (!server->standalone)
1805     silc_server_send_notify_nick_change(server, server->router->connection,
1806                                         server->server_type == SILC_SERVER ?
1807                                         FALSE : TRUE, client->id,
1808                                         new_id);
1809
1810   oidp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
1811
1812   /* Remove old cache entry */
1813   silc_idcache_del_by_context(server->local_list->clients, client);
1814
1815   /* Free old ID */
1816   silc_free(client->id);
1817
1818   /* Save the nickname as this client is our local client */
1819   silc_free(client->nickname);
1820
1821   client->nickname = strdup(nick);
1822   client->id = new_id;
1823
1824   /* Update client cache */
1825   silc_idcache_add(server->local_list->clients, client->nickname,
1826                    client->id, (void *)client, FALSE);
1827
1828   nidp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
1829
1830   /* Send NICK_CHANGE notify to the client's channels */
1831   silc_server_send_notify_on_channels(server, NULL, client,
1832                                       SILC_NOTIFY_TYPE_NICK_CHANGE, 2,
1833                                       oidp->data, oidp->len,
1834                                       nidp->data, nidp->len);
1835
1836   /* Send the new Client ID as reply command back to client */
1837   packet = silc_command_reply_payload_encode_va(SILC_COMMAND_NICK,
1838                                                 SILC_STATUS_OK, ident, 1,
1839                                                 2, nidp->data, nidp->len);
1840   silc_server_packet_send(cmd->server, cmd->sock, SILC_PACKET_COMMAND_REPLY,
1841                           0, packet->data, packet->len, FALSE);
1842
1843   silc_buffer_free(packet);
1844   silc_buffer_free(nidp);
1845   silc_buffer_free(oidp);
1846
1847  out:
1848   silc_server_command_free(cmd);
1849 }
1850
1851 /* Sends the LIST command reply */
1852
1853 static void
1854 silc_server_command_list_send_reply(SilcServerCommandContext cmd,
1855                                     SilcChannelEntry *lch,
1856                                     uint32 lch_count,
1857                                     SilcChannelEntry *gch,
1858                                     uint32 gch_count)
1859 {
1860   int i;
1861   SilcBuffer packet, idp;
1862   SilcChannelEntry entry;
1863   SilcCommandStatus status;
1864   uint16 ident = silc_command_get_ident(cmd->payload);
1865   char *topic;
1866   unsigned char usercount[4];
1867   uint32 users;
1868
1869   for (i = 0; i < lch_count; i++)
1870     if (lch[i]->mode & SILC_CHANNEL_MODE_SECRET)
1871       lch[i] = NULL;
1872   for (i = 0; i < gch_count; i++)
1873     if (gch[i]->mode & SILC_CHANNEL_MODE_SECRET)
1874       gch[i] = NULL;
1875
1876   status = SILC_STATUS_OK;
1877   if ((lch_count + gch_count) > 1)
1878     status = SILC_STATUS_LIST_START;
1879
1880   /* Local list */
1881   for (i = 0; i < lch_count; i++) {
1882     entry = lch[i];
1883
1884     if (!entry)
1885       continue;
1886
1887     if (i >= 1)
1888       status = SILC_STATUS_LIST_ITEM;
1889
1890     if (i == lch_count - 1 && gch_count)
1891       break;
1892     if (lch_count > 1 && i == lch_count - 1)
1893       status = SILC_STATUS_LIST_END;
1894
1895     idp = silc_id_payload_encode(entry->id, SILC_ID_CHANNEL);
1896
1897     if (entry->mode & SILC_CHANNEL_MODE_PRIVATE) {
1898       topic = "*private*";
1899       memset(usercount, 0, sizeof(usercount));
1900     } else {
1901       topic = entry->topic;
1902       users = silc_hash_table_count(entry->user_list);
1903       SILC_PUT32_MSB(users, usercount);
1904     }
1905
1906     /* Send the reply */
1907     if (topic)
1908       packet =
1909         silc_command_reply_payload_encode_va(SILC_COMMAND_LIST,
1910                                              status, ident, 4,
1911                                              2, idp->data, idp->len,
1912                                              3, entry->channel_name,
1913                                              strlen(entry->channel_name),
1914                                              4, topic, strlen(topic),
1915                                              5, usercount, 4);
1916     else
1917       packet =
1918         silc_command_reply_payload_encode_va(SILC_COMMAND_LIST,
1919                                              status, ident, 3,
1920                                              2, idp->data, idp->len,
1921                                              3, entry->channel_name,
1922                                              strlen(entry->channel_name),
1923                                              5, usercount, 4);
1924     silc_server_packet_send(cmd->server, cmd->sock,
1925                             SILC_PACKET_COMMAND_REPLY, 0, packet->data,
1926                             packet->len, FALSE);
1927     silc_buffer_free(packet);
1928     silc_buffer_free(idp);
1929   }
1930
1931   status = i ? SILC_STATUS_LIST_ITEM : SILC_STATUS_OK;
1932
1933   /* Global list */
1934   for (i = 0; i < gch_count; i++) {
1935     entry = gch[i];
1936
1937     if (!entry)
1938       continue;
1939
1940     if (i >= 1)
1941       status = SILC_STATUS_LIST_ITEM;
1942
1943     if (gch_count > 1 && i == lch_count - 1)
1944       status = SILC_STATUS_LIST_END;
1945
1946     idp = silc_id_payload_encode(entry->id, SILC_ID_CHANNEL);
1947
1948     if (entry->mode & SILC_CHANNEL_MODE_PRIVATE) {
1949       topic = "*private*";
1950       memset(usercount, 0, sizeof(usercount));
1951     } else {
1952       topic = entry->topic;
1953       users = silc_hash_table_count(entry->user_list);
1954       SILC_PUT32_MSB(users, usercount);
1955     }
1956
1957     /* Send the reply */
1958     if (topic)
1959       packet =
1960         silc_command_reply_payload_encode_va(SILC_COMMAND_LIST,
1961                                              status, ident, 4,
1962                                              2, idp->data, idp->len,
1963                                              3, entry->channel_name,
1964                                              strlen(entry->channel_name),
1965                                              4, topic, strlen(topic),
1966                                              5, usercount, 4);
1967     else
1968       packet =
1969         silc_command_reply_payload_encode_va(SILC_COMMAND_LIST,
1970                                              status, ident, 3,
1971                                              2, idp->data, idp->len,
1972                                              3, entry->channel_name,
1973                                              strlen(entry->channel_name),
1974                                              5, usercount, 4);
1975     silc_server_packet_send(cmd->server, cmd->sock,
1976                             SILC_PACKET_COMMAND_REPLY, 0, packet->data,
1977                             packet->len, FALSE);
1978     silc_buffer_free(packet);
1979     silc_buffer_free(idp);
1980   }
1981 }
1982
1983 /* Server side of LIST command. This lists the channel of the requested
1984    server. Secret channels are not listed. */
1985
1986 SILC_SERVER_CMD_FUNC(list)
1987 {
1988   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
1989   SilcServer server = cmd->server;
1990   SilcChannelID *channel_id = NULL;
1991   unsigned char *tmp;
1992   uint32 tmp_len;
1993   SilcChannelEntry *lchannels = NULL, *gchannels = NULL;
1994   uint32 lch_count = 0, gch_count = 0;
1995
1996   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_LIST, cmd, 0, 2);
1997
1998   /* Get Channel ID */
1999   tmp = silc_argument_get_arg_type(cmd->args, 1, &tmp_len);
2000   if (tmp) {
2001     channel_id = silc_id_payload_parse_id(tmp, tmp_len);
2002     if (!channel_id) {
2003       silc_server_command_send_status_reply(cmd, SILC_COMMAND_LIST,
2004                                             SILC_STATUS_ERR_NO_CHANNEL_ID);
2005       goto out;
2006     }
2007   }
2008
2009   /* Get the channels from local list */
2010   lchannels = silc_idlist_get_channels(server->local_list, channel_id,
2011                                        &lch_count);
2012
2013   /* Get the channels from global list if we are router */
2014   if (server->server_type == SILC_ROUTER)
2015     gchannels = silc_idlist_get_channels(server->global_list, channel_id,
2016                                          &gch_count);
2017
2018   /* Send the reply */
2019   silc_server_command_list_send_reply(cmd, lchannels, lch_count,
2020                                       gchannels, gch_count);
2021
2022  out:
2023   silc_server_command_free(cmd);
2024 }
2025
2026 /* Server side of TOPIC command. Sets topic for channel and/or returns
2027    current topic to client. */
2028
2029 SILC_SERVER_CMD_FUNC(topic)
2030 {
2031   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
2032   SilcServer server = cmd->server;
2033   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
2034   SilcChannelID *channel_id;
2035   SilcChannelEntry channel;
2036   SilcChannelClientEntry chl;
2037   SilcBuffer packet, idp;
2038   unsigned char *tmp;
2039   uint32 argc, tmp_len;
2040   uint16 ident = silc_command_get_ident(cmd->payload);
2041
2042   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_TOPIC, cmd, 1, 2);
2043
2044   argc = silc_argument_get_arg_num(cmd->args);
2045
2046   /* Get Channel ID */
2047   tmp = silc_argument_get_arg_type(cmd->args, 1, &tmp_len);
2048   if (!tmp) {
2049     silc_server_command_send_status_reply(cmd, SILC_COMMAND_TOPIC,
2050                                           SILC_STATUS_ERR_NO_CHANNEL_ID);
2051     goto out;
2052   }
2053   channel_id = silc_id_payload_parse_id(tmp, tmp_len);
2054   if (!channel_id) {
2055     silc_server_command_send_status_reply(cmd, SILC_COMMAND_TOPIC,
2056                                           SILC_STATUS_ERR_NO_CHANNEL_ID);
2057     goto out;
2058   }
2059
2060   /* Check whether the channel exists */
2061   channel = silc_idlist_find_channel_by_id(server->local_list,
2062                                            channel_id, NULL);
2063   if (!channel) {
2064     channel = silc_idlist_find_channel_by_id(server->global_list,
2065                                              channel_id, NULL);
2066     if (!channel) {
2067       silc_server_command_send_status_reply(cmd, SILC_COMMAND_TOPIC,
2068                                             SILC_STATUS_ERR_NO_SUCH_CHANNEL);
2069       goto out;
2070     }
2071   }
2072
2073   if (argc > 1) {
2074     /* Get the topic */
2075     tmp = silc_argument_get_arg_type(cmd->args, 2, NULL);
2076     if (!tmp) {
2077       silc_server_command_send_status_reply(cmd, SILC_COMMAND_TOPIC,
2078                                             SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
2079       goto out;
2080     }
2081
2082     if (strlen(tmp) > 256) {
2083       silc_server_command_send_status_reply(cmd, SILC_COMMAND_TOPIC,
2084                                             SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
2085       goto out;
2086     }
2087
2088     /* See whether the client is on channel and has rights to change topic */
2089     if (!silc_hash_table_find(channel->user_list, client, NULL,
2090                               (void *)&chl)) {
2091       silc_server_command_send_status_reply(cmd, SILC_COMMAND_TOPIC,
2092                                             SILC_STATUS_ERR_NOT_ON_CHANNEL);
2093       goto out;
2094     }
2095
2096     if (chl->mode == SILC_CHANNEL_UMODE_NONE) {
2097       if (channel->mode & SILC_CHANNEL_MODE_TOPIC) {
2098         silc_server_command_send_status_reply(cmd, SILC_COMMAND_TOPIC,
2099                                               SILC_STATUS_ERR_NO_CHANNEL_PRIV);
2100         goto out;
2101       }
2102     }
2103
2104     /* Set the topic for channel */
2105     if (channel->topic)
2106       silc_free(channel->topic);
2107     channel->topic = strdup(tmp);
2108
2109     /* Send TOPIC_SET notify type to the network */
2110     if (!server->standalone)
2111       silc_server_send_notify_topic_set(server, server->router->connection,
2112                                         server->server_type == SILC_ROUTER ?
2113                                         TRUE : FALSE, channel, client->id,
2114                                         channel->topic);
2115
2116     idp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
2117
2118     /* Send notify about topic change to all clients on the channel */
2119     silc_server_send_notify_to_channel(server, NULL, channel, TRUE,
2120                                        SILC_NOTIFY_TYPE_TOPIC_SET, 2,
2121                                        idp->data, idp->len,
2122                                        channel->topic, strlen(channel->topic));
2123     silc_buffer_free(idp);
2124   }
2125
2126   /* Send the topic to client as reply packet */
2127   idp = silc_id_payload_encode(channel_id, SILC_ID_CHANNEL);
2128   if (channel->topic)
2129     packet = silc_command_reply_payload_encode_va(SILC_COMMAND_TOPIC,
2130                                                   SILC_STATUS_OK, ident, 2,
2131                                                   2, idp->data, idp->len,
2132                                                   3, channel->topic,
2133                                                   strlen(channel->topic));
2134   else
2135     packet = silc_command_reply_payload_encode_va(SILC_COMMAND_TOPIC,
2136                                                   SILC_STATUS_OK, ident, 1,
2137                                                   2, idp->data, idp->len);
2138   silc_server_packet_send(cmd->server, cmd->sock, SILC_PACKET_COMMAND_REPLY,
2139                           0, packet->data, packet->len, FALSE);
2140
2141   silc_buffer_free(packet);
2142   silc_buffer_free(idp);
2143   silc_free(channel_id);
2144
2145  out:
2146   silc_server_command_free(cmd);
2147 }
2148
2149 /* Server side of INVITE command. Invites some client to join some channel.
2150    This command is also used to manage the invite list of the channel. */
2151
2152 SILC_SERVER_CMD_FUNC(invite)
2153 {
2154   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
2155   SilcServer server = cmd->server;
2156   SilcSocketConnection sock = cmd->sock, dest_sock;
2157   SilcChannelClientEntry chl;
2158   SilcClientEntry sender, dest;
2159   SilcClientID *dest_id = NULL;
2160   SilcChannelEntry channel;
2161   SilcChannelID *channel_id = NULL;
2162   SilcIDListData idata;
2163   SilcBuffer idp, idp2, packet;
2164   unsigned char *tmp, *add, *del;
2165   uint32 len;
2166   uint16 ident = silc_command_get_ident(cmd->payload);
2167
2168   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_INVITE, cmd, 1, 4);
2169
2170   /* Get Channel ID */
2171   tmp = silc_argument_get_arg_type(cmd->args, 1, &len);
2172   if (!tmp) {
2173     silc_server_command_send_status_reply(cmd, SILC_COMMAND_INVITE,
2174                                           SILC_STATUS_ERR_NO_CHANNEL_ID);
2175     goto out;
2176   }
2177   channel_id = silc_id_payload_parse_id(tmp, len);
2178   if (!channel_id) {
2179     silc_server_command_send_status_reply(cmd, SILC_COMMAND_INVITE,
2180                                           SILC_STATUS_ERR_NO_CHANNEL_ID);
2181     goto out;
2182   }
2183
2184   /* Get the channel entry */
2185   channel = silc_idlist_find_channel_by_id(server->local_list,
2186                                            channel_id, NULL);
2187   if (!channel) {
2188     channel = silc_idlist_find_channel_by_id(server->global_list,
2189                                              channel_id, NULL);
2190     if (!channel) {
2191       silc_server_command_send_status_reply(cmd, SILC_COMMAND_INVITE,
2192                                             SILC_STATUS_ERR_NO_SUCH_CHANNEL);
2193       goto out;
2194     }
2195   }
2196
2197   /* Check whether the sender of this command is on the channel. */
2198   sender = (SilcClientEntry)sock->user_data;
2199   if (!silc_server_client_on_channel(sender, channel)) {
2200     silc_server_command_send_status_reply(cmd, SILC_COMMAND_INVITE,
2201                                           SILC_STATUS_ERR_NOT_ON_CHANNEL);
2202     goto out;
2203   }
2204
2205   /* Check whether the channel is invite-only channel. If yes then the
2206      sender of this command must be at least channel operator. */
2207   if (channel->mode & SILC_CHANNEL_MODE_INVITE) {
2208     silc_hash_table_find(channel->user_list, sender, NULL, (void *)&chl);
2209     if (chl->mode == SILC_CHANNEL_UMODE_NONE) {
2210       silc_server_command_send_status_reply(cmd, SILC_COMMAND_INVITE,
2211                                             SILC_STATUS_ERR_NO_CHANNEL_PRIV);
2212       goto out;
2213     }
2214   }
2215
2216   /* Get destination client ID */
2217   tmp = silc_argument_get_arg_type(cmd->args, 2, &len);
2218   if (tmp) {
2219     char invite[512];
2220
2221     dest_id = silc_id_payload_parse_id(tmp, len);
2222     if (!dest_id) {
2223       silc_server_command_send_status_reply(cmd, SILC_COMMAND_INVITE,
2224                                             SILC_STATUS_ERR_NO_CLIENT_ID);
2225       goto out;
2226     }
2227
2228     /* Get the client entry */
2229     dest = silc_server_get_client_resolve(server, dest_id);
2230     if (!dest) {
2231       if (server->server_type == SILC_ROUTER) {
2232         silc_server_command_send_status_reply(cmd, SILC_COMMAND_INVITE,
2233                                      SILC_STATUS_ERR_NO_SUCH_CLIENT_ID);
2234         goto out;
2235       }
2236
2237       /* The client info is being resolved. Reprocess this packet after
2238          receiving the reply to the query. */
2239       silc_server_command_pending(server, SILC_COMMAND_WHOIS,
2240                                   server->cmd_ident,
2241                                   silc_server_command_destructor,
2242                                   silc_server_command_invite,
2243                                   silc_server_command_dup(cmd));
2244       cmd->pending = TRUE;
2245       silc_free(channel_id);
2246       silc_free(dest_id);
2247       return;
2248     }
2249
2250     /* Check whether the requested client is already on the channel. */
2251     if (silc_server_client_on_channel(dest, channel)) {
2252       silc_server_command_send_status_reply(cmd, SILC_COMMAND_INVITE,
2253                                             SILC_STATUS_ERR_USER_ON_CHANNEL);
2254       goto out;
2255     }
2256
2257     /* Get route to the client */
2258     dest_sock = silc_server_get_client_route(server, NULL, 0, dest_id, &idata);
2259     if (!dest_sock) {
2260       silc_server_command_send_status_reply(cmd, SILC_COMMAND_INVITE,
2261                                             SILC_STATUS_ERR_NO_SUCH_CLIENT_ID);
2262       goto out;
2263     }
2264
2265     memset(invite, 0, sizeof(invite));
2266     strncat(invite, dest->nickname, strlen(dest->nickname));
2267     strncat(invite, "!", 1);
2268     strncat(invite, dest->username, strlen(dest->username));
2269     if (!strchr(dest->username, '@')) {
2270       strncat(invite, "@", 1);
2271       strncat(invite, cmd->sock->hostname, strlen(cmd->sock->hostname));
2272     }
2273
2274     len = strlen(invite);
2275     if (!channel->invite_list)
2276       channel->invite_list = silc_calloc(len + 2,
2277                                          sizeof(*channel->invite_list));
2278     else
2279       channel->invite_list = silc_realloc(channel->invite_list,
2280                                           sizeof(*channel->invite_list) *
2281                                           (len +
2282                                            strlen(channel->invite_list) + 2));
2283     strncat(channel->invite_list, invite, len);
2284     strncat(channel->invite_list, ",", 1);
2285
2286     /* Send notify to the client that is invited to the channel */
2287     idp = silc_id_payload_encode(channel_id, SILC_ID_CHANNEL);
2288     idp2 = silc_id_payload_encode(sender->id, SILC_ID_CLIENT);
2289     silc_server_send_notify_dest(server, dest_sock, FALSE, dest_id,
2290                                  SILC_ID_CLIENT,
2291                                  SILC_NOTIFY_TYPE_INVITE, 3,
2292                                  idp->data, idp->len,
2293                                  channel->channel_name,
2294                                  strlen(channel->channel_name),
2295                                  idp2->data, idp2->len);
2296     silc_buffer_free(idp);
2297     silc_buffer_free(idp2);
2298   }
2299
2300   /* Add the client to the invite list of the channel */
2301   add = silc_argument_get_arg_type(cmd->args, 3, &len);
2302   if (add) {
2303     if (!channel->invite_list)
2304       channel->invite_list = silc_calloc(len + 2,
2305                                          sizeof(*channel->invite_list));
2306     else
2307       channel->invite_list = silc_realloc(channel->invite_list,
2308                                           sizeof(*channel->invite_list) *
2309                                           (len +
2310                                            strlen(channel->invite_list) + 2));
2311     if (add[len - 1] == ',')
2312       add[len - 1] = '\0';
2313
2314     strncat(channel->invite_list, add, len);
2315     strncat(channel->invite_list, ",", 1);
2316   }
2317
2318   /* Get the invite to be removed and remove it from the list */
2319   del = silc_argument_get_arg_type(cmd->args, 4, &len);
2320   if (del && channel->invite_list) {
2321     char *start, *end, *n;
2322
2323     if (!strncmp(channel->invite_list, del,
2324                  strlen(channel->invite_list) - 1)) {
2325       silc_free(channel->invite_list);
2326       channel->invite_list = NULL;
2327     } else {
2328       start = strstr(channel->invite_list, del);
2329       if (start && strlen(start) >= len) {
2330         end = start + len;
2331         n = silc_calloc(strlen(channel->invite_list) - len, sizeof(*n));
2332         strncat(n, channel->invite_list, start - channel->invite_list);
2333         strncat(n, end + 1, ((channel->invite_list +
2334                               strlen(channel->invite_list)) - end) - 1);
2335         silc_free(channel->invite_list);
2336         channel->invite_list = n;
2337       }
2338     }
2339   }
2340
2341   /* Send notify to the primary router */
2342   if (!server->standalone)
2343     silc_server_send_notify_invite(server, server->router->connection,
2344                                    server->server_type == SILC_ROUTER ?
2345                                    TRUE : FALSE, channel,
2346                                    sender->id, add, del);
2347
2348   /* Send command reply */
2349   tmp = silc_argument_get_arg_type(cmd->args, 1, &len);
2350
2351   if (add || del)
2352     packet =
2353       silc_command_reply_payload_encode_va(SILC_COMMAND_INVITE,
2354                                            SILC_STATUS_OK, ident, 2,
2355                                            2, tmp, len,
2356                                            3, channel->invite_list,
2357                                            channel->invite_list ?
2358                                            strlen(channel->invite_list) : 0);
2359   else
2360     packet =
2361       silc_command_reply_payload_encode_va(SILC_COMMAND_INVITE,
2362                                            SILC_STATUS_OK, ident, 1,
2363                                            2, tmp, len);
2364   silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0,
2365                           packet->data, packet->len, FALSE);
2366   silc_buffer_free(packet);
2367
2368  out:
2369   if (dest_id)
2370     silc_free(dest_id);
2371   if (channel_id)
2372     silc_free(channel_id);
2373   silc_server_command_free(cmd);
2374 }
2375
2376 typedef struct {
2377   SilcServer server;
2378   SilcSocketConnection sock;
2379   char *signoff;
2380 } *QuitInternal;
2381
2382 /* Quits connection to client. This gets called if client won't
2383    close the connection even when it has issued QUIT command. */
2384
2385 SILC_TASK_CALLBACK(silc_server_command_quit_cb)
2386 {
2387   QuitInternal q = (QuitInternal)context;
2388
2389   /* Free all client specific data, such as client entry and entires
2390      on channels this client may be on. */
2391   silc_server_free_client_data(q->server, q->sock, q->sock->user_data,
2392                                TRUE, q->signoff);
2393   q->sock->user_data = NULL;
2394
2395   /* Close the connection on our side */
2396   silc_server_close_connection(q->server, q->sock);
2397
2398   silc_free(q->signoff);
2399   silc_free(q);
2400 }
2401
2402 /* Quits SILC session. This is the normal way to disconnect client. */
2403
2404 SILC_SERVER_CMD_FUNC(quit)
2405 {
2406   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
2407   SilcServer server = cmd->server;
2408   SilcSocketConnection sock = cmd->sock;
2409   QuitInternal q;
2410   unsigned char *tmp = NULL;
2411   uint32 len = 0;
2412
2413   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_QUIT, cmd, 0, 1);
2414
2415   if (cmd->sock->type != SILC_SOCKET_TYPE_CLIENT)
2416     goto out;
2417
2418   /* Get destination ID */
2419   tmp = silc_argument_get_arg_type(cmd->args, 1, &len);
2420   if (len > 128)
2421     tmp = NULL;
2422
2423   q = silc_calloc(1, sizeof(*q));
2424   q->server = server;
2425   q->sock = sock;
2426   q->signoff = tmp ? strdup(tmp) : NULL;
2427
2428   /* We quit the connection with little timeout */
2429   silc_schedule_task_add(server->schedule, sock->sock,
2430                      silc_server_command_quit_cb, (void *)q,
2431                      0, 200000, SILC_TASK_TIMEOUT, SILC_TASK_PRI_LOW);
2432
2433  out:
2434   silc_server_command_free(cmd);
2435 }
2436
2437 /* Server side of command KILL. This command is used by router operator
2438    to remove an client from the SILC Network temporarily. */
2439
2440 SILC_SERVER_CMD_FUNC(kill)
2441 {
2442   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
2443   SilcServer server = cmd->server;
2444   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
2445   SilcClientEntry remote_client;
2446   SilcClientID *client_id;
2447   unsigned char *tmp, *comment;
2448   uint32 tmp_len, tmp_len2;
2449
2450   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_KILL, cmd, 1, 2);
2451
2452   if (!client || cmd->sock->type != SILC_SOCKET_TYPE_CLIENT)
2453     goto out;
2454
2455   /* KILL command works only on router */
2456   if (server->server_type != SILC_ROUTER) {
2457     silc_server_command_send_status_reply(cmd, SILC_COMMAND_KILL,
2458                                           SILC_STATUS_ERR_NO_ROUTER_PRIV);
2459     goto out;
2460   }
2461
2462   /* Check whether client has the permissions. */
2463   if (!(client->mode & SILC_UMODE_ROUTER_OPERATOR)) {
2464     silc_server_command_send_status_reply(cmd, SILC_COMMAND_KILL,
2465                                           SILC_STATUS_ERR_NO_ROUTER_PRIV);
2466     goto out;
2467   }
2468
2469   /* Get the client ID */
2470   tmp = silc_argument_get_arg_type(cmd->args, 1, &tmp_len);
2471   if (!tmp) {
2472     silc_server_command_send_status_reply(cmd, SILC_COMMAND_KILL,
2473                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
2474     goto out;
2475   }
2476   client_id = silc_id_payload_parse_id(tmp, tmp_len);
2477   if (!client_id) {
2478     silc_server_command_send_status_reply(cmd, SILC_COMMAND_KILL,
2479                                           SILC_STATUS_ERR_NO_SUCH_CLIENT_ID);
2480     goto out;
2481   }
2482
2483   /* Get the client entry */
2484   remote_client = silc_idlist_find_client_by_id(server->local_list,
2485                                                 client_id, NULL);
2486   if (!remote_client) {
2487     remote_client = silc_idlist_find_client_by_id(server->global_list,
2488                                                   client_id, NULL);
2489     if (!remote_client) {
2490       silc_server_command_send_status_reply(cmd, SILC_COMMAND_KILL,
2491                                             SILC_STATUS_ERR_NO_SUCH_CLIENT_ID);
2492       goto out;
2493     }
2494   }
2495
2496   if (remote_client->data.registered == FALSE) {
2497     silc_server_command_send_status_reply(cmd, SILC_COMMAND_KILL,
2498                                           SILC_STATUS_ERR_NO_SUCH_CLIENT_ID);
2499     goto out;
2500   }
2501
2502   /* Get comment */
2503   comment = silc_argument_get_arg_type(cmd->args, 2, &tmp_len2);
2504   if (tmp_len2 > 128)
2505     comment = NULL;
2506
2507   /* Send reply to the sender */
2508   silc_server_command_send_status_reply(cmd, SILC_COMMAND_KILL,
2509                                         SILC_STATUS_OK);
2510
2511   /* Send the KILL notify packets. First send it to the channel, then
2512      to our primary router and then directly to the client who is being
2513      killed right now. */
2514
2515   /* Send KILLED notify to the channels. It is not sent to the client
2516      as it will be sent differently destined directly to the client and not
2517      to the channel. */
2518   silc_server_send_notify_on_channels(server, remote_client,
2519                                       remote_client, SILC_NOTIFY_TYPE_KILLED,
2520                                       comment ? 2 : 1,
2521                                       tmp, tmp_len,
2522                                       comment, comment ? tmp_len2 : 0);
2523
2524   /* Send KILLED notify to primary route */
2525   if (!server->standalone)
2526     silc_server_send_notify_killed(server, server->router->connection, TRUE,
2527                                    remote_client->id, comment);
2528
2529   /* Send KILLED notify to the client directly */
2530   silc_server_send_notify_killed(server, remote_client->connection ?
2531                                  remote_client->connection :
2532                                  remote_client->router->connection, FALSE,
2533                                  remote_client->id, comment);
2534
2535   /* Remove the client from all channels. This generates new keys to the
2536      channels as well. */
2537   silc_server_remove_from_channels(server, NULL, remote_client, FALSE,
2538                                    NULL, TRUE);
2539
2540   /* Remove the client entry, If it is locally connected then we will also
2541      disconnect the client here */
2542   if (remote_client->data.registered && remote_client->connection) {
2543     /* Remove locally conneted client */
2544     SilcSocketConnection sock = remote_client->connection;
2545     silc_server_free_client_data(server, sock, remote_client, FALSE, NULL);
2546     silc_server_close_connection(server, sock);
2547   } else {
2548     /* Remove remote client */
2549     if (!silc_idlist_del_client(server->global_list, remote_client))
2550       silc_idlist_del_client(server->local_list, remote_client);
2551   }
2552
2553  out:
2554   silc_server_command_free(cmd);
2555 }
2556
2557 /* Server side of command INFO. This sends information about us to
2558    the client. If client requested specific server we will send the
2559    command to that server. */
2560
2561 SILC_SERVER_CMD_FUNC(info)
2562 {
2563   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
2564   SilcServer server = cmd->server;
2565   SilcBuffer packet, idp;
2566   unsigned char *tmp;
2567   uint32 tmp_len;
2568   char *dest_server, *server_info = NULL, *server_name;
2569   uint16 ident = silc_command_get_ident(cmd->payload);
2570   SilcServerEntry entry = NULL;
2571   SilcServerID *server_id = NULL;
2572
2573   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_INFO, cmd, 0, 2);
2574
2575   /* Get server name */
2576   dest_server = silc_argument_get_arg_type(cmd->args, 1, NULL);
2577
2578   /* Get Server ID */
2579   tmp = silc_argument_get_arg_type(cmd->args, 2, &tmp_len);
2580   if (tmp) {
2581     server_id = silc_id_payload_parse_id(tmp, tmp_len);
2582     if (!server_id) {
2583       silc_server_command_send_status_reply(cmd, SILC_COMMAND_INFO,
2584                                             SILC_STATUS_ERR_NO_SERVER_ID);
2585       goto out;
2586     }
2587   }
2588
2589   if (server_id) {
2590     /* Check whether we have this server cached */
2591     entry = silc_idlist_find_server_by_id(server->local_list,
2592                                           server_id, NULL);
2593     if (!entry) {
2594       entry = silc_idlist_find_server_by_id(server->global_list,
2595                                             server_id, NULL);
2596       if (!entry && server->server_type == SILC_ROUTER) {
2597         silc_server_command_send_status_reply(cmd, SILC_COMMAND_INFO,
2598                                               SILC_STATUS_ERR_NO_SUCH_SERVER);
2599         goto out;
2600       }
2601     }
2602   }
2603
2604   if ((!dest_server && !server_id && !entry) || (entry &&
2605                                                  entry == server->id_entry) ||
2606       (dest_server && !cmd->pending &&
2607        !strncasecmp(dest_server, server->server_name, strlen(dest_server)))) {
2608     /* Send our reply */
2609     char info_string[256];
2610
2611     memset(info_string, 0, sizeof(info_string));
2612     snprintf(info_string, sizeof(info_string),
2613              "location: %s server: %s admin: %s <%s>",
2614              server->config->admin_info->location,
2615              server->config->admin_info->server_type,
2616              server->config->admin_info->admin_name,
2617              server->config->admin_info->admin_email);
2618
2619     server_info = info_string;
2620     entry = server->id_entry;
2621   } else {
2622     /* Check whether we have this server cached */
2623     if (!entry && dest_server) {
2624       entry = silc_idlist_find_server_by_name(server->global_list,
2625                                               dest_server, NULL);
2626       if (!entry) {
2627         entry = silc_idlist_find_server_by_name(server->local_list,
2628                                                 dest_server, NULL);
2629       }
2630     }
2631
2632     if (!cmd->pending &&
2633         server->server_type == SILC_ROUTER && entry && !entry->server_info) {
2634       /* Send to the server */
2635       SilcBuffer tmpbuf;
2636       uint16 old_ident;
2637
2638       old_ident = silc_command_get_ident(cmd->payload);
2639       silc_command_set_ident(cmd->payload, silc_rng_get_rn16(server->rng));
2640       tmpbuf = silc_command_payload_encode_payload(cmd->payload);
2641
2642       silc_server_packet_send(server, entry->connection,
2643                               SILC_PACKET_COMMAND, cmd->packet->flags,
2644                               tmpbuf->data, tmpbuf->len, TRUE);
2645
2646       /* Reprocess this packet after received reply from router */
2647       silc_server_command_pending(server, SILC_COMMAND_INFO,
2648                                   silc_command_get_ident(cmd->payload),
2649                                   silc_server_command_destructor,
2650                                   silc_server_command_info,
2651                                   silc_server_command_dup(cmd));
2652       cmd->pending = TRUE;
2653       silc_command_set_ident(cmd->payload, old_ident);
2654       silc_buffer_free(tmpbuf);
2655       return;
2656     }
2657
2658     if (!entry && !cmd->pending && !server->standalone) {
2659       /* Send to the primary router */
2660       SilcBuffer tmpbuf;
2661       uint16 old_ident;
2662
2663       old_ident = silc_command_get_ident(cmd->payload);
2664       silc_command_set_ident(cmd->payload, silc_rng_get_rn16(server->rng));
2665       tmpbuf = silc_command_payload_encode_payload(cmd->payload);
2666
2667       silc_server_packet_send(server, server->router->connection,
2668                               SILC_PACKET_COMMAND, cmd->packet->flags,
2669                               tmpbuf->data, tmpbuf->len, TRUE);
2670
2671       /* Reprocess this packet after received reply from router */
2672       silc_server_command_pending(server, SILC_COMMAND_INFO,
2673                                   silc_command_get_ident(cmd->payload),
2674                                   silc_server_command_destructor,
2675                                   silc_server_command_info,
2676                                   silc_server_command_dup(cmd));
2677       cmd->pending = TRUE;
2678       silc_command_set_ident(cmd->payload, old_ident);
2679       silc_buffer_free(tmpbuf);
2680       return;
2681     }
2682   }
2683
2684   if (server_id)
2685     silc_free(server_id);
2686
2687   if (!entry) {
2688     silc_server_command_send_status_reply(cmd, SILC_COMMAND_INFO,
2689                                           SILC_STATUS_ERR_NO_SUCH_SERVER);
2690     goto out;
2691   }
2692
2693   idp = silc_id_payload_encode(entry->id, SILC_ID_SERVER);
2694   if (!server_info)
2695     server_info = entry->server_info;
2696   server_name = entry->server_name;
2697
2698   /* Send the reply */
2699   if (server_info)
2700     packet = silc_command_reply_payload_encode_va(SILC_COMMAND_INFO,
2701                                                   SILC_STATUS_OK, ident, 3,
2702                                                   2, idp->data, idp->len,
2703                                                   3, server_name,
2704                                                   strlen(server_name),
2705                                                   4, server_info,
2706                                                   strlen(server_info));
2707   else
2708     packet = silc_command_reply_payload_encode_va(SILC_COMMAND_INFO,
2709                                                   SILC_STATUS_OK, ident, 2,
2710                                                   2, idp->data, idp->len,
2711                                                   3, server_name,
2712                                                   strlen(server_name));
2713   silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0,
2714                           packet->data, packet->len, FALSE);
2715
2716   silc_buffer_free(packet);
2717   silc_buffer_free(idp);
2718
2719  out:
2720   silc_server_command_free(cmd);
2721 }
2722
2723 /* Server side of command PING. This just replies to the ping. */
2724
2725 SILC_SERVER_CMD_FUNC(ping)
2726 {
2727   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
2728   SilcServer server = cmd->server;
2729   SilcServerID *id;
2730   uint32 len;
2731   unsigned char *tmp;
2732
2733   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_INFO, cmd, 1, 2);
2734
2735   /* Get Server ID */
2736   tmp = silc_argument_get_arg_type(cmd->args, 1, &len);
2737   if (!tmp) {
2738     silc_server_command_send_status_reply(cmd, SILC_COMMAND_PING,
2739                                           SILC_STATUS_ERR_NO_SERVER_ID);
2740     goto out;
2741   }
2742   id = silc_id_str2id(tmp, len, SILC_ID_SERVER);
2743   if (!id)
2744     goto out;
2745
2746   if (SILC_ID_SERVER_COMPARE(id, server->id)) {
2747     /* Send our reply */
2748     silc_server_command_send_status_reply(cmd, SILC_COMMAND_PING,
2749                                           SILC_STATUS_OK);
2750   } else {
2751     silc_server_command_send_status_reply(cmd, SILC_COMMAND_PING,
2752                                           SILC_STATUS_ERR_NO_SUCH_SERVER);
2753     goto out;
2754   }
2755
2756   silc_free(id);
2757
2758  out:
2759   silc_server_command_free(cmd);
2760 }
2761
2762 /* Internal routine to join channel. The channel sent to this function
2763    has been either created or resolved from ID lists. This joins the sent
2764    client to the channel. */
2765
2766 static void silc_server_command_join_channel(SilcServer server,
2767                                              SilcServerCommandContext cmd,
2768                                              SilcChannelEntry channel,
2769                                              SilcClientID *client_id,
2770                                              int created,
2771                                              uint32 umode)
2772 {
2773   SilcSocketConnection sock = cmd->sock;
2774   unsigned char *tmp;
2775   uint32 tmp_len, user_count;
2776   unsigned char *passphrase = NULL, mode[4], tmp2[4], tmp3[4];
2777   SilcClientEntry client;
2778   SilcChannelClientEntry chl;
2779   SilcBuffer reply, chidp, clidp, keyp = NULL, user_list, mode_list;
2780   uint16 ident = silc_command_get_ident(cmd->payload);
2781   char check[512], check2[512];
2782
2783   SILC_LOG_DEBUG(("Start"));
2784
2785   if (!channel)
2786     return;
2787
2788   /* Get the client entry */
2789   if (cmd->sock->type == SILC_SOCKET_TYPE_CLIENT) {
2790     client = (SilcClientEntry)sock->user_data;
2791   } else {
2792     client = silc_server_get_client_resolve(server, client_id);
2793     if (!client) {
2794       if (cmd->pending)
2795         goto out;
2796
2797       /* The client info is being resolved. Reprocess this packet after
2798          receiving the reply to the query. */
2799       silc_server_command_pending(server, SILC_COMMAND_WHOIS,
2800                                   server->cmd_ident, NULL,
2801                                   silc_server_command_join,
2802                                   silc_server_command_dup(cmd));
2803       cmd->pending = TRUE;
2804       return;
2805     }
2806
2807     cmd->pending = FALSE;
2808   }
2809
2810   /*
2811    * Check channel modes
2812    */
2813
2814   memset(check, 0, sizeof(check));
2815   memset(check2, 0, sizeof(check2));
2816   strncat(check, client->nickname, strlen(client->nickname));
2817   strncat(check, "!", 1);
2818   strncat(check, client->username, strlen(client->username));
2819   if (!strchr(client->username, '@')) {
2820     strncat(check, "@", 1);
2821     strncat(check, cmd->sock->hostname, strlen(cmd->sock->hostname));
2822   }
2823
2824   strncat(check2, client->nickname, strlen(client->nickname));
2825   if (!strchr(client->nickname, '@')) {
2826     strncat(check2, "@", 1);
2827     strncat(check2, server->server_name, strlen(server->server_name));
2828   }
2829   strncat(check2, "!", 1);
2830   strncat(check2, client->username, strlen(client->username));
2831   if (!strchr(client->username, '@')) {
2832     strncat(check2, "@", 1);
2833     strncat(check2, cmd->sock->hostname, strlen(cmd->sock->hostname));
2834   }
2835
2836   /* Check invite list if channel is invite-only channel */
2837   if (channel->mode & SILC_CHANNEL_MODE_INVITE) {
2838     if (!channel->invite_list ||
2839         (!silc_string_match(channel->invite_list, check) &&
2840          !silc_string_match(channel->invite_list, check2))) {
2841       silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
2842                                             SILC_STATUS_ERR_NOT_INVITED);
2843       goto out;
2844     }
2845   }
2846
2847   /* Check ban list if it exists. If the client's nickname, server,
2848      username and/or hostname is in the ban list the access to the
2849      channel is denied. */
2850   if (channel->ban_list) {
2851     if (silc_string_match(channel->ban_list, check) ||
2852         silc_string_match(channel->ban_list, check2)) {
2853       silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
2854                               SILC_STATUS_ERR_BANNED_FROM_CHANNEL);
2855       goto out;
2856     }
2857   }
2858
2859   /* Get passphrase */
2860   tmp = silc_argument_get_arg_type(cmd->args, 3, &tmp_len);
2861   if (tmp) {
2862     passphrase = silc_calloc(tmp_len, sizeof(*passphrase));
2863     memcpy(passphrase, tmp, tmp_len);
2864   }
2865
2866   /* Check the channel passphrase if set. */
2867   if (channel->mode & SILC_CHANNEL_MODE_PASSPHRASE) {
2868     if (!passphrase || memcmp(channel->passphrase, passphrase,
2869                               strlen(channel->passphrase))) {
2870       silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
2871                                             SILC_STATUS_ERR_BAD_PASSWORD);
2872       goto out;
2873     }
2874   }
2875
2876   /* Check user count limit if set. */
2877   if (channel->mode & SILC_CHANNEL_MODE_ULIMIT) {
2878     if (silc_hash_table_count(channel->user_list) + 1 >
2879         channel->user_limit) {
2880       silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
2881                                             SILC_STATUS_ERR_CHANNEL_IS_FULL);
2882       goto out;
2883     }
2884   }
2885
2886   /*
2887    * Client is allowed to join to the channel. Make it happen.
2888    */
2889
2890   /* Check whether the client already is on the channel */
2891   if (silc_server_client_on_channel(client, channel)) {
2892     silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
2893                                           SILC_STATUS_ERR_USER_ON_CHANNEL);
2894     goto out;
2895   }
2896
2897   /* Generate new channel key as protocol dictates */
2898   if ((!created && silc_hash_table_count(channel->user_list) > 0) ||
2899       !channel->channel_key)
2900     if (!silc_server_create_channel_key(server, channel, 0))
2901       goto out;
2902
2903   /* Send the channel key. This is broadcasted to the channel but is not
2904      sent to the client who is joining to the channel. */
2905   if (!(channel->mode & SILC_CHANNEL_MODE_PRIVKEY))
2906     silc_server_send_channel_key(server, NULL, channel,
2907                                  server->server_type == SILC_ROUTER ?
2908                                  FALSE : !server->standalone);
2909
2910   /* Join the client to the channel by adding it to channel's user list.
2911      Add also the channel to client entry's channels list for fast cross-
2912      referencing. */
2913   chl = silc_calloc(1, sizeof(*chl));
2914   chl->mode = umode;
2915   chl->client = client;
2916   chl->channel = channel;
2917   silc_hash_table_add(channel->user_list, client, chl);
2918   silc_hash_table_add(client->channels, channel, chl);
2919
2920   /* Get users on the channel */
2921   silc_server_get_users_on_channel(server, channel, &user_list, &mode_list,
2922                                    &user_count);
2923
2924   /* Encode Client ID Payload of the original client who wants to join */
2925   clidp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
2926
2927   /* Encode command reply packet */
2928   chidp = silc_id_payload_encode(channel->id, SILC_ID_CHANNEL);
2929   SILC_PUT32_MSB(channel->mode, mode);
2930   SILC_PUT32_MSB(created, tmp2);
2931   SILC_PUT32_MSB(user_count, tmp3);
2932
2933   if (!(channel->mode & SILC_CHANNEL_MODE_PRIVKEY)) {
2934     tmp = silc_id_id2str(channel->id, SILC_ID_CHANNEL);
2935     keyp = silc_channel_key_payload_encode(SILC_ID_CHANNEL_LEN, tmp,
2936                                            strlen(channel->channel_key->
2937                                                   cipher->name),
2938                                            channel->channel_key->cipher->name,
2939                                            channel->key_len / 8, channel->key);
2940     silc_free(tmp);
2941   }
2942
2943   reply =
2944     silc_command_reply_payload_encode_va(SILC_COMMAND_JOIN,
2945                                          SILC_STATUS_OK, ident, 13,
2946                                          2, channel->channel_name,
2947                                          strlen(channel->channel_name),
2948                                          3, chidp->data, chidp->len,
2949                                          4, clidp->data, clidp->len,
2950                                          5, mode, 4,
2951                                          6, tmp2, 4,
2952                                          7, keyp ? keyp->data : NULL,
2953                                          keyp ? keyp->len : 0,
2954                                          8, channel->ban_list,
2955                                          channel->ban_list ?
2956                                          strlen(channel->ban_list) : 0,
2957                                          9, channel->invite_list,
2958                                          channel->invite_list ?
2959                                          strlen(channel->invite_list) : 0,
2960                                          10, channel->topic,
2961                                          channel->topic ?
2962                                          strlen(channel->topic) : 0,
2963                                          11, channel->hmac->hmac->name,
2964                                          strlen(channel->hmac->hmac->name),
2965                                          12, tmp3, 4,
2966                                          13, user_list->data, user_list->len,
2967                                          14, mode_list->data,
2968                                          mode_list->len);
2969
2970   /* Send command reply */
2971   silc_server_packet_send(server, sock, SILC_PACKET_COMMAND_REPLY, 0,
2972                           reply->data, reply->len, FALSE);
2973
2974   if (!cmd->pending) {
2975     /* Send JOIN notify to locally connected clients on the channel */
2976     silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
2977                                        SILC_NOTIFY_TYPE_JOIN, 2,
2978                                        clidp->data, clidp->len,
2979                                        chidp->data, chidp->len);
2980
2981     /* Send JOIN notify packet to our primary router */
2982     if (!server->standalone)
2983       silc_server_send_notify_join(server, server->router->connection,
2984                                    server->server_type == SILC_ROUTER ?
2985                                    TRUE : FALSE, channel, client->id);
2986   }
2987
2988   silc_buffer_free(reply);
2989   silc_buffer_free(clidp);
2990   silc_buffer_free(chidp);
2991   silc_buffer_free(keyp);
2992   silc_buffer_free(user_list);
2993   silc_buffer_free(mode_list);
2994
2995  out:
2996   if (passphrase)
2997     silc_free(passphrase);
2998 }
2999
3000 /* Server side of command JOIN. Joins client into requested channel. If
3001    the channel does not exist it will be created. */
3002
3003 SILC_SERVER_CMD_FUNC(join)
3004 {
3005   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
3006   SilcServer server = cmd->server;
3007   uint32 tmp_len;
3008   char *tmp, *channel_name = NULL, *cipher, *hmac;
3009   SilcChannelEntry channel;
3010   uint32 umode = 0;
3011   int created = FALSE;
3012   SilcClientID *client_id;
3013
3014   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_JOIN, cmd, 1, 4);
3015
3016   /* Get channel name */
3017   tmp = silc_argument_get_arg_type(cmd->args, 1, &tmp_len);
3018   if (!tmp) {
3019     silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
3020                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
3021     goto out;
3022   }
3023   channel_name = tmp;
3024
3025   if (strlen(channel_name) > 256)
3026     channel_name[255] = '\0';
3027
3028   if (silc_server_command_bad_chars(channel_name) == TRUE) {
3029     silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
3030                                           SILC_STATUS_ERR_BAD_CHANNEL);
3031     goto out;
3032   }
3033
3034   /* Get Client ID of the client who is joining to the channel */
3035   tmp = silc_argument_get_arg_type(cmd->args, 2, &tmp_len);
3036   if (!tmp) {
3037     silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
3038                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
3039     goto out;
3040   }
3041   client_id = silc_id_payload_parse_id(tmp, tmp_len);
3042   if (!client_id) {
3043     silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
3044                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
3045     goto out;
3046   }
3047
3048   /* Get cipher and hmac name */
3049   cipher = silc_argument_get_arg_type(cmd->args, 4, NULL);
3050   hmac = silc_argument_get_arg_type(cmd->args, 5, NULL);
3051
3052   /* See if the channel exists */
3053   channel = silc_idlist_find_channel_by_name(server->local_list,
3054                                              channel_name, NULL);
3055
3056   if (cmd->sock->type == SILC_SOCKET_TYPE_CLIENT) {
3057     /* If this is coming from client the Client ID in the command packet must
3058        be same as the client's ID. */
3059     if (cmd->sock->type == SILC_SOCKET_TYPE_CLIENT) {
3060       SilcClientEntry entry = (SilcClientEntry)cmd->sock->user_data;
3061       if (!SILC_ID_CLIENT_COMPARE(entry->id, client_id)) {
3062         silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
3063                                         SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
3064         goto out;
3065       }
3066     }
3067
3068     if (!channel || !channel->id) {
3069       /* Channel not found */
3070
3071       /* If we are standalone server we don't have a router, we just create
3072          the channel by ourselves. */
3073       if (server->standalone) {
3074         channel = silc_server_create_new_channel(server, server->id, cipher,
3075                                                  hmac, channel_name, TRUE);
3076         if (!channel) {
3077           silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
3078                                      SILC_STATUS_ERR_UNKNOWN_ALGORITHM);
3079           goto out;
3080         }
3081
3082         umode = (SILC_CHANNEL_UMODE_CHANOP | SILC_CHANNEL_UMODE_CHANFO);
3083         created = TRUE;
3084
3085       } else {
3086
3087         /* The channel does not exist on our server. If we are normal server
3088            we will send JOIN command to our router which will handle the
3089            joining procedure (either creates the channel if it doesn't exist
3090            or joins the client to it). */
3091         if (server->server_type == SILC_SERVER) {
3092           SilcBuffer tmpbuf;
3093           uint16 old_ident;
3094
3095           /* If this is pending command callback then we've resolved
3096              it and it didn't work, return since we've notified the
3097              client already in the command reply callback. */
3098           if (cmd->pending)
3099             goto out;
3100
3101           old_ident = silc_command_get_ident(cmd->payload);
3102           silc_command_set_ident(cmd->payload, silc_rng_get_rn16(server->rng));
3103           tmpbuf = silc_command_payload_encode_payload(cmd->payload);
3104
3105           /* Send JOIN command to our router */
3106           silc_server_packet_send(server, (SilcSocketConnection)
3107                                   server->router->connection,
3108                                   SILC_PACKET_COMMAND, cmd->packet->flags,
3109                                   tmpbuf->data, tmpbuf->len, TRUE);
3110
3111           /* Reprocess this packet after received reply from router */
3112           silc_server_command_pending(server, SILC_COMMAND_JOIN,
3113                                       silc_command_get_ident(cmd->payload),
3114                                       silc_server_command_destructor,
3115                                       silc_server_command_join,
3116                                       silc_server_command_dup(cmd));
3117           cmd->pending = TRUE;
3118           return;
3119         }
3120
3121         /* We are router and the channel does not seem exist so we will check
3122            our global list as well for the channel. */
3123         channel = silc_idlist_find_channel_by_name(server->global_list,
3124                                                    channel_name, NULL);
3125         if (!channel) {
3126           /* Channel really does not exist, create it */
3127           channel = silc_server_create_new_channel(server, server->id, cipher,
3128                                                    hmac, channel_name, TRUE);
3129           if (!channel) {
3130             silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
3131                                        SILC_STATUS_ERR_UNKNOWN_ALGORITHM);
3132             goto out;
3133           }
3134
3135           umode = (SILC_CHANNEL_UMODE_CHANOP | SILC_CHANNEL_UMODE_CHANFO);
3136           created = TRUE;
3137         }
3138       }
3139     }
3140   } else {
3141     if (!channel) {
3142       /* Channel not found */
3143
3144       /* If the command came from router and/or we are normal server then
3145          something went wrong with the joining as the channel was not found.
3146          We can't do anything else but ignore this. */
3147       if (cmd->sock->type == SILC_SOCKET_TYPE_ROUTER ||
3148           server->server_type == SILC_SERVER)
3149         goto out;
3150
3151       /* We are router and the channel does not seem exist so we will check
3152          our global list as well for the channel. */
3153       channel = silc_idlist_find_channel_by_name(server->global_list,
3154                                                  channel_name, NULL);
3155       if (!channel) {
3156         /* Channel really does not exist, create it */
3157         channel = silc_server_create_new_channel(server, server->id, cipher,
3158                                                  hmac, channel_name, TRUE);
3159         if (!channel) {
3160           silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
3161                                        SILC_STATUS_ERR_UNKNOWN_ALGORITHM);
3162           goto out;
3163         }
3164
3165         umode = (SILC_CHANNEL_UMODE_CHANOP | SILC_CHANNEL_UMODE_CHANFO);
3166         created = TRUE;
3167       }
3168     }
3169   }
3170
3171   /* If the channel does not have global users and is also empty it means the
3172      channel was created globally (by our router) and the client will be the
3173      channel founder and operator. */
3174   if (!channel->global_users && !silc_hash_table_count(channel->user_list)) {
3175     umode = (SILC_CHANNEL_UMODE_CHANOP | SILC_CHANNEL_UMODE_CHANFO);
3176     created = TRUE;             /* Created globally by our router */
3177   }
3178
3179   /* Join to the channel */
3180   silc_server_command_join_channel(server, cmd, channel, client_id,
3181                                    created, umode);
3182
3183   silc_free(client_id);
3184
3185  out:
3186   silc_server_command_free(cmd);
3187 }
3188
3189 /* Server side of command MOTD. Sends server's current "message of the
3190    day" to the client. */
3191
3192 SILC_SERVER_CMD_FUNC(motd)
3193 {
3194   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
3195   SilcServer server = cmd->server;
3196   SilcBuffer packet, idp;
3197   char *motd, *dest_server;
3198   uint32 motd_len;
3199   uint16 ident = silc_command_get_ident(cmd->payload);
3200
3201   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_MOTD, cmd, 1, 1);
3202
3203   /* Get server name */
3204   dest_server = silc_argument_get_arg_type(cmd->args, 1, NULL);
3205   if (!dest_server) {
3206     silc_server_command_send_status_reply(cmd, SILC_COMMAND_MOTD,
3207                                           SILC_STATUS_ERR_NO_SUCH_SERVER);
3208     goto out;
3209   }
3210
3211   if (!strncasecmp(dest_server, server->server_name, strlen(dest_server))) {
3212     /* Send our MOTD */
3213
3214     idp = silc_id_payload_encode(server->id_entry->id, SILC_ID_SERVER);
3215
3216     if (server->config && server->config->motd &&
3217         server->config->motd->motd_file) {
3218       /* Send motd */
3219       motd = silc_file_read(server->config->motd->motd_file, &motd_len);
3220       if (!motd)
3221         goto out;
3222
3223       motd[motd_len] = 0;
3224       packet = silc_command_reply_payload_encode_va(SILC_COMMAND_MOTD,
3225                                                     SILC_STATUS_OK, ident, 2,
3226                                                     2, idp, idp->len,
3227                                                     3, motd, motd_len);
3228       goto out;
3229     } else {
3230       /* No motd */
3231       packet = silc_command_reply_payload_encode_va(SILC_COMMAND_MOTD,
3232                                                     SILC_STATUS_OK, ident, 1,
3233                                                     2, idp, idp->len);
3234     }
3235
3236     silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0,
3237                             packet->data, packet->len, FALSE);
3238     silc_buffer_free(packet);
3239     silc_buffer_free(idp);
3240   } else {
3241     SilcServerEntry entry;
3242
3243     /* Check whether we have this server cached */
3244     entry = silc_idlist_find_server_by_name(server->global_list,
3245                                             dest_server, NULL);
3246     if (!entry) {
3247       entry = silc_idlist_find_server_by_name(server->local_list,
3248                                               dest_server, NULL);
3249     }
3250
3251     if (server->server_type == SILC_ROUTER && !cmd->pending &&
3252         entry && !entry->motd) {
3253       /* Send to the server */
3254       SilcBuffer tmpbuf;
3255       uint16 old_ident;
3256
3257       old_ident = silc_command_get_ident(cmd->payload);
3258       silc_command_set_ident(cmd->payload, silc_rng_get_rn16(server->rng));
3259       tmpbuf = silc_command_payload_encode_payload(cmd->payload);
3260
3261       silc_server_packet_send(server, entry->connection,
3262                               SILC_PACKET_COMMAND, cmd->packet->flags,
3263                               tmpbuf->data, tmpbuf->len, TRUE);
3264
3265       /* Reprocess this packet after received reply from router */
3266       silc_server_command_pending(server, SILC_COMMAND_MOTD,
3267                                   silc_command_get_ident(cmd->payload),
3268                                   silc_server_command_destructor,
3269                                   silc_server_command_motd,
3270                                   silc_server_command_dup(cmd));
3271       cmd->pending = TRUE;
3272       silc_command_set_ident(cmd->payload, old_ident);
3273       silc_buffer_free(tmpbuf);
3274       return;
3275     }
3276
3277     if (!entry && !cmd->pending && !server->standalone) {
3278       /* Send to the primary router */
3279       SilcBuffer tmpbuf;
3280       uint16 old_ident;
3281
3282       old_ident = silc_command_get_ident(cmd->payload);
3283       silc_command_set_ident(cmd->payload, silc_rng_get_rn16(server->rng));
3284       tmpbuf = silc_command_payload_encode_payload(cmd->payload);
3285
3286       silc_server_packet_send(server, server->router->connection,
3287                               SILC_PACKET_COMMAND, cmd->packet->flags,
3288                               tmpbuf->data, tmpbuf->len, TRUE);
3289
3290       /* Reprocess this packet after received reply from router */
3291       silc_server_command_pending(server, SILC_COMMAND_MOTD,
3292                                   silc_command_get_ident(cmd->payload),
3293                                   silc_server_command_destructor,
3294                                   silc_server_command_motd,
3295                                   silc_server_command_dup(cmd));
3296       cmd->pending = TRUE;
3297       silc_command_set_ident(cmd->payload, old_ident);
3298       silc_buffer_free(tmpbuf);
3299       return;
3300     }
3301
3302     if (!entry) {
3303       silc_server_command_send_status_reply(cmd, SILC_COMMAND_INFO,
3304                                             SILC_STATUS_ERR_NO_SUCH_SERVER);
3305       goto out;
3306     }
3307
3308     idp = silc_id_payload_encode(server->id_entry->id, SILC_ID_SERVER);
3309
3310     if (entry->motd)
3311       packet = silc_command_reply_payload_encode_va(SILC_COMMAND_MOTD,
3312                                                     SILC_STATUS_OK, ident, 2,
3313                                                     2, idp, idp->len,
3314                                                     3, entry->motd,
3315                                                     strlen(entry->motd));
3316     else
3317       packet = silc_command_reply_payload_encode_va(SILC_COMMAND_MOTD,
3318                                                     SILC_STATUS_OK, ident, 1,
3319                                                     2, idp, idp->len);
3320
3321     silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0,
3322                             packet->data, packet->len, FALSE);
3323     silc_buffer_free(packet);
3324     silc_buffer_free(idp);
3325   }
3326
3327  out:
3328   silc_server_command_free(cmd);
3329 }
3330
3331 /* Server side of command UMODE. Client can use this command to set/unset
3332    user mode. Client actually cannot set itself to be as server/router
3333    operator so this can be used only to unset the modes. */
3334
3335 SILC_SERVER_CMD_FUNC(umode)
3336 {
3337   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
3338   SilcServer server = cmd->server;
3339   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
3340   SilcBuffer packet;
3341   unsigned char *tmp_mask;
3342   uint32 mask;
3343   uint16 ident = silc_command_get_ident(cmd->payload);
3344
3345   if (cmd->sock->type != SILC_SOCKET_TYPE_CLIENT)
3346     goto out;
3347
3348   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_UMODE, cmd, 2, 2);
3349
3350   /* Get the client's mode mask */
3351   tmp_mask = silc_argument_get_arg_type(cmd->args, 2, NULL);
3352   if (!tmp_mask) {
3353     silc_server_command_send_status_reply(cmd, SILC_COMMAND_UMODE,
3354                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
3355     goto out;
3356   }
3357   SILC_GET32_MSB(mask, tmp_mask);
3358
3359   /*
3360    * Change the mode
3361    */
3362
3363   if (mask & SILC_UMODE_SERVER_OPERATOR) {
3364     if (!(client->mode & SILC_UMODE_SERVER_OPERATOR)) {
3365       /* Cannot operator mode */
3366       silc_server_command_send_status_reply(cmd, SILC_COMMAND_UMODE,
3367                                             SILC_STATUS_ERR_PERM_DENIED);
3368       goto out;
3369     }
3370   } else {
3371     if (client->mode & SILC_UMODE_SERVER_OPERATOR)
3372       /* Remove the server operator rights */
3373       client->mode &= ~SILC_UMODE_SERVER_OPERATOR;
3374   }
3375
3376   if (mask & SILC_UMODE_ROUTER_OPERATOR) {
3377     if (!(client->mode & SILC_UMODE_ROUTER_OPERATOR)) {
3378       /* Cannot operator mode */
3379       silc_server_command_send_status_reply(cmd, SILC_COMMAND_UMODE,
3380                                             SILC_STATUS_ERR_PERM_DENIED);
3381       goto out;
3382     }
3383   } else {
3384     if (client->mode & SILC_UMODE_ROUTER_OPERATOR)
3385       /* Remove the router operator rights */
3386       client->mode &= ~SILC_UMODE_ROUTER_OPERATOR;
3387   }
3388
3389   if (mask & SILC_UMODE_GONE) {
3390     client->mode |= SILC_UMODE_GONE;
3391   } else {
3392     if (client->mode & SILC_UMODE_GONE)
3393       /* Remove the gone status */
3394       client->mode &= ~SILC_UMODE_GONE;
3395   }
3396
3397   /* Send UMODE change to primary router */
3398   if (!server->standalone)
3399     silc_server_send_notify_umode(server, server->router->connection, TRUE,
3400                                   client->id, client->mode);
3401
3402   /* Send command reply to sender */
3403   packet = silc_command_reply_payload_encode_va(SILC_COMMAND_UMODE,
3404                                                 SILC_STATUS_OK, ident, 1,
3405                                                 2, tmp_mask, 4);
3406   silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0,
3407                           packet->data, packet->len, FALSE);
3408   silc_buffer_free(packet);
3409
3410  out:
3411   silc_server_command_free(cmd);
3412 }
3413
3414 /* Checks that client has rights to add or remove channel modes. If any
3415    of the checks fails FALSE is returned. */
3416
3417 int silc_server_check_cmode_rights(SilcChannelEntry channel,
3418                                    SilcChannelClientEntry client,
3419                                    uint32 mode)
3420 {
3421   int is_op = client->mode & SILC_CHANNEL_UMODE_CHANOP;
3422   int is_fo = client->mode & SILC_CHANNEL_UMODE_CHANFO;
3423
3424   /* Check whether has rights to change anything */
3425   if (!is_op && !is_fo)
3426     return FALSE;
3427
3428   /* Check whether has rights to change everything */
3429   if (is_op && is_fo)
3430     return TRUE;
3431
3432   /* We know that client is channel operator, check that they are not
3433      changing anything that requires channel founder rights. Rest of the
3434      modes are available automatically for channel operator. */
3435
3436   if (mode & SILC_CHANNEL_MODE_PRIVKEY) {
3437     if (is_op && !is_fo)
3438       return FALSE;
3439   } else {
3440     if (channel->mode & SILC_CHANNEL_MODE_PRIVKEY) {
3441       if (is_op && !is_fo)
3442         return FALSE;
3443     }
3444   }
3445
3446   if (mode & SILC_CHANNEL_MODE_PASSPHRASE) {
3447     if (is_op && !is_fo)
3448       return FALSE;
3449   } else {
3450     if (channel->mode & SILC_CHANNEL_MODE_PASSPHRASE) {
3451       if (is_op && !is_fo)
3452         return FALSE;
3453     }
3454   }
3455
3456   if (mode & SILC_CHANNEL_MODE_CIPHER) {
3457     if (is_op && !is_fo)
3458       return FALSE;
3459   } else {
3460     if (channel->mode & SILC_CHANNEL_MODE_CIPHER) {
3461       if (is_op && !is_fo)
3462         return FALSE;
3463     }
3464   }
3465
3466   if (mode & SILC_CHANNEL_MODE_FOUNDER_AUTH) {
3467     if (is_op && !is_fo)
3468       return FALSE;
3469   } else {
3470     if (channel->mode & SILC_CHANNEL_MODE_FOUNDER_AUTH) {
3471       if (is_op && !is_fo)
3472         return FALSE;
3473     }
3474   }
3475
3476   return TRUE;
3477 }
3478
3479 /* Server side command of CMODE. Changes channel mode */
3480
3481 SILC_SERVER_CMD_FUNC(cmode)
3482 {
3483   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
3484   SilcServer server = cmd->server;
3485   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
3486   SilcIDListData idata = (SilcIDListData)client;
3487   SilcChannelID *channel_id;
3488   SilcChannelEntry channel;
3489   SilcChannelClientEntry chl;
3490   SilcBuffer packet, cidp;
3491   unsigned char *tmp, *tmp_id, *tmp_mask;
3492   char *cipher = NULL, *hmac = NULL;
3493   uint32 mode_mask, tmp_len, tmp_len2;
3494   uint16 ident = silc_command_get_ident(cmd->payload);
3495
3496   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_CMODE, cmd, 2, 7);
3497
3498   /* Get Channel ID */
3499   tmp_id = silc_argument_get_arg_type(cmd->args, 1, &tmp_len2);
3500   if (!tmp_id) {
3501     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3502                                           SILC_STATUS_ERR_NO_CHANNEL_ID);
3503     goto out;
3504   }
3505   channel_id = silc_id_payload_parse_id(tmp_id, tmp_len2);
3506   if (!channel_id) {
3507     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3508                                           SILC_STATUS_ERR_NO_CHANNEL_ID);
3509     goto out;
3510   }
3511
3512   /* Get the channel mode mask */
3513   tmp_mask = silc_argument_get_arg_type(cmd->args, 2, &tmp_len);
3514   if (!tmp_mask) {
3515     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3516                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
3517     goto out;
3518   }
3519   SILC_GET32_MSB(mode_mask, tmp_mask);
3520
3521   /* Get channel entry */
3522   channel = silc_idlist_find_channel_by_id(server->local_list,
3523                                            channel_id, NULL);
3524   if (!channel) {
3525     channel = silc_idlist_find_channel_by_id(server->global_list,
3526                                              channel_id, NULL);
3527     if (!channel) {
3528       silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3529                                             SILC_STATUS_ERR_NO_SUCH_CHANNEL);
3530       goto out;
3531     }
3532   }
3533
3534   /* Check whether this client is on the channel */
3535   if (!silc_server_client_on_channel(client, channel)) {
3536     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3537                                           SILC_STATUS_ERR_NOT_ON_CHANNEL);
3538     goto out;
3539   }
3540
3541   /* Get entry to the channel user list */
3542   silc_hash_table_find(channel->user_list, client, NULL, (void *)&chl);
3543
3544   /* Check that client has rights to change any requested channel modes */
3545   if (!silc_server_check_cmode_rights(channel, chl, mode_mask)) {
3546     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3547                                           SILC_STATUS_ERR_NO_CHANNEL_PRIV);
3548     goto out;
3549   }
3550
3551   /*
3552    * Check the modes. Modes that requires nothing special operation are
3553    * not checked here.
3554    */
3555
3556   if (mode_mask & SILC_CHANNEL_MODE_PRIVKEY) {
3557     /* Channel uses private keys to protect traffic. Client(s) has set the
3558        key locally they want to use, server does not know that key. */
3559     /* Nothing interesting to do here */
3560   } else {
3561     if (channel->mode & SILC_CHANNEL_MODE_PRIVKEY) {
3562       /* The mode is removed and we need to generate and distribute
3563          new channel key. Clients are not using private channel keys
3564          anymore after this. */
3565
3566       /* Re-generate channel key */
3567       if (!silc_server_create_channel_key(server, channel, 0))
3568         goto out;
3569
3570       /* Send the channel key. This sends it to our local clients and if
3571          we are normal server to our router as well. */
3572       silc_server_send_channel_key(server, NULL, channel,
3573                                    server->server_type == SILC_ROUTER ?
3574                                    FALSE : !server->standalone);
3575
3576       cipher = channel->channel_key->cipher->name;
3577       hmac = channel->hmac->hmac->name;
3578     }
3579   }
3580
3581   if (mode_mask & SILC_CHANNEL_MODE_ULIMIT) {
3582     /* User limit is set on channel */
3583     uint32 user_limit;
3584
3585     /* Get user limit */
3586     tmp = silc_argument_get_arg_type(cmd->args, 3, NULL);
3587     if (!tmp) {
3588       if (!(channel->mode & SILC_CHANNEL_MODE_ULIMIT)) {
3589         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3590                                    SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
3591         goto out;
3592       }
3593     } else {
3594       SILC_GET32_MSB(user_limit, tmp);
3595       channel->user_limit = user_limit;
3596     }
3597   } else {
3598     if (channel->mode & SILC_CHANNEL_MODE_ULIMIT)
3599       /* User limit mode is unset. Remove user limit */
3600       channel->user_limit = 0;
3601   }
3602
3603   if (mode_mask & SILC_CHANNEL_MODE_PASSPHRASE) {
3604     if (!(channel->mode & SILC_CHANNEL_MODE_PASSPHRASE)) {
3605       /* Passphrase has been set to channel */
3606
3607       /* Get the passphrase */
3608       tmp = silc_argument_get_arg_type(cmd->args, 4, NULL);
3609       if (!tmp) {
3610         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3611                                    SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
3612         goto out;
3613       }
3614
3615       /* Save the passphrase */
3616       channel->passphrase = strdup(tmp);
3617     }
3618   } else {
3619     if (channel->mode & SILC_CHANNEL_MODE_PASSPHRASE) {
3620       /* Passphrase mode is unset. remove the passphrase */
3621       if (channel->passphrase) {
3622         silc_free(channel->passphrase);
3623         channel->passphrase = NULL;
3624       }
3625     }
3626   }
3627
3628   if (mode_mask & SILC_CHANNEL_MODE_CIPHER) {
3629     if (!(channel->mode & SILC_CHANNEL_MODE_CIPHER)) {
3630       /* Cipher to use protect the traffic */
3631
3632       /* Get cipher */
3633       cipher = silc_argument_get_arg_type(cmd->args, 5, NULL);
3634       if (!cipher) {
3635         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3636                                    SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
3637         goto out;
3638       }
3639
3640       /* Delete old cipher and allocate the new one */
3641       silc_cipher_free(channel->channel_key);
3642       if (!silc_cipher_alloc(cipher, &channel->channel_key)) {
3643         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3644                                        SILC_STATUS_ERR_UNKNOWN_ALGORITHM);
3645         goto out;
3646       }
3647
3648       /* Re-generate channel key */
3649       if (!silc_server_create_channel_key(server, channel, 0))
3650         goto out;
3651
3652       /* Send the channel key. This sends it to our local clients and if
3653          we are normal server to our router as well. */
3654       silc_server_send_channel_key(server, NULL, channel,
3655                                    server->server_type == SILC_ROUTER ?
3656                                    FALSE : !server->standalone);
3657     }
3658   } else {
3659     if (channel->mode & SILC_CHANNEL_MODE_CIPHER) {
3660       /* Cipher mode is unset. Remove the cipher and revert back to
3661          default cipher */
3662       cipher = channel->cipher;
3663
3664       /* Delete old cipher and allocate default one */
3665       silc_cipher_free(channel->channel_key);
3666       if (!silc_cipher_alloc(cipher ? cipher : "aes-256-cbc",
3667                              &channel->channel_key)) {
3668         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3669                                    SILC_STATUS_ERR_UNKNOWN_ALGORITHM);
3670         goto out;
3671       }
3672
3673       /* Re-generate channel key */
3674       if (!silc_server_create_channel_key(server, channel, 0))
3675         goto out;
3676
3677       /* Send the channel key. This sends it to our local clients and if
3678          we are normal server to our router as well. */
3679       silc_server_send_channel_key(server, NULL, channel,
3680                                    server->server_type == SILC_ROUTER ?
3681                                    FALSE : !server->standalone);
3682     }
3683   }
3684
3685   if (mode_mask & SILC_CHANNEL_MODE_HMAC) {
3686     if (!(channel->mode & SILC_CHANNEL_MODE_HMAC)) {
3687       /* HMAC to use protect the traffic */
3688       unsigned char hash[32];
3689
3690       /* Get hmac */
3691       hmac = silc_argument_get_arg_type(cmd->args, 6, NULL);
3692       if (!hmac) {
3693         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3694                                    SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
3695         goto out;
3696       }
3697
3698       /* Delete old hmac and allocate the new one */
3699       silc_hmac_free(channel->hmac);
3700       if (!silc_hmac_alloc(hmac, NULL, &channel->hmac)) {
3701         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3702                                        SILC_STATUS_ERR_UNKNOWN_ALGORITHM);
3703         goto out;
3704       }
3705
3706       /* Set the HMAC key out of current channel key. The client must do
3707          this locally. */
3708       silc_hash_make(channel->hmac->hash, channel->key, channel->key_len / 8,
3709                      hash);
3710       silc_hmac_set_key(channel->hmac, hash,
3711                         silc_hash_len(channel->hmac->hash));
3712       memset(hash, 0, sizeof(hash));
3713     }
3714   } else {
3715     if (channel->mode & SILC_CHANNEL_MODE_HMAC) {
3716       /* Hmac mode is unset. Remove the hmac and revert back to
3717          default hmac */
3718       unsigned char hash[32];
3719       hmac = channel->hmac_name;
3720
3721       /* Delete old hmac and allocate default one */
3722       silc_hmac_free(channel->hmac);
3723       if (!silc_hmac_alloc(hmac ? hmac : "hmac-sha1-96", NULL,
3724                            &channel->hmac)) {
3725         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3726                                        SILC_STATUS_ERR_UNKNOWN_ALGORITHM);
3727         goto out;
3728       }
3729
3730       /* Set the HMAC key out of current channel key. The client must do
3731          this locally. */
3732       silc_hash_make(channel->hmac->hash, channel->key, channel->key_len / 8,
3733                      hash);
3734       silc_hmac_set_key(channel->hmac, hash,
3735                         silc_hash_len(channel->hmac->hash));
3736       memset(hash, 0, sizeof(hash));
3737     }
3738   }
3739
3740   if (mode_mask & SILC_CHANNEL_MODE_FOUNDER_AUTH) {
3741     if (chl->mode & SILC_CHANNEL_UMODE_CHANFO) {
3742       if (!(channel->mode & SILC_CHANNEL_MODE_FOUNDER_AUTH)) {
3743         /* Set the founder authentication */
3744         SilcAuthPayload auth;
3745
3746         tmp = silc_argument_get_arg_type(cmd->args, 7, &tmp_len);
3747         if (!tmp) {
3748           silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3749                                      SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
3750           goto out;
3751         }
3752
3753         auth = silc_auth_payload_parse(tmp, tmp_len);
3754         if (!auth) {
3755           silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3756                                      SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
3757           goto out;
3758         }
3759
3760         /* Save the public key */
3761         tmp = silc_pkcs_public_key_encode(idata->public_key, &tmp_len);
3762         silc_pkcs_public_key_decode(tmp, tmp_len, &channel->founder_key);
3763         silc_free(tmp);
3764
3765         channel->founder_method = silc_auth_get_method(auth);
3766
3767         if (channel->founder_method == SILC_AUTH_PASSWORD) {
3768           tmp = silc_auth_get_data(auth, &tmp_len);
3769           channel->founder_passwd =
3770             silc_calloc(tmp_len + 1, sizeof(*channel->founder_passwd));
3771           memcpy(channel->founder_passwd, tmp, tmp_len);
3772           channel->founder_passwd_len = tmp_len;
3773         } else {
3774           /* Verify the payload before setting the mode */
3775           if (!silc_auth_verify(auth, channel->founder_method,
3776                                 channel->founder_key, 0, idata->hash,
3777                                 client->id, SILC_ID_CLIENT)) {
3778             silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3779                                                   SILC_STATUS_ERR_AUTH_FAILED);
3780             goto out;
3781           }
3782         }
3783
3784         silc_auth_payload_free(auth);
3785       }
3786     }
3787   } else {
3788     if (chl->mode & SILC_CHANNEL_UMODE_CHANFO) {
3789       if (channel->mode & SILC_CHANNEL_MODE_FOUNDER_AUTH) {
3790         if (channel->founder_key)
3791           silc_pkcs_public_key_free(channel->founder_key);
3792         if (channel->founder_passwd) {
3793           silc_free(channel->founder_passwd);
3794           channel->founder_passwd = NULL;
3795         }
3796       }
3797     }
3798   }
3799
3800   /* Finally, set the mode */
3801   channel->mode = mode_mask;
3802
3803   /* Send CMODE_CHANGE notify */
3804   cidp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
3805   silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
3806                                      SILC_NOTIFY_TYPE_CMODE_CHANGE, 4,
3807                                      cidp->data, cidp->len,
3808                                      tmp_mask, 4,
3809                                      cipher, cipher ? strlen(cipher) : 0,
3810                                      hmac, hmac ? strlen(hmac) : 0);
3811
3812   /* Set CMODE notify type to network */
3813   if (!server->standalone)
3814     silc_server_send_notify_cmode(server, server->router->connection,
3815                                   server->server_type == SILC_ROUTER ?
3816                                   TRUE : FALSE, channel,
3817                                   mode_mask, client->id, SILC_ID_CLIENT,
3818                                   cipher, hmac);
3819
3820   /* Send command reply to sender */
3821   packet = silc_command_reply_payload_encode_va(SILC_COMMAND_CMODE,
3822                                                 SILC_STATUS_OK, ident, 2,
3823                                                 2, tmp_id, tmp_len2,
3824                                                 3, tmp_mask, 4);
3825   silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0,
3826                           packet->data, packet->len, FALSE);
3827
3828   silc_buffer_free(packet);
3829   silc_free(channel_id);
3830   silc_free(cidp);
3831
3832  out:
3833   silc_server_command_free(cmd);
3834 }
3835
3836 /* Server side of CUMODE command. Changes client's mode on a channel. */
3837
3838 SILC_SERVER_CMD_FUNC(cumode)
3839 {
3840   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
3841   SilcServer server = cmd->server;
3842   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
3843   SilcIDListData idata = (SilcIDListData)client;
3844   SilcChannelID *channel_id;
3845   SilcClientID *client_id;
3846   SilcChannelEntry channel;
3847   SilcClientEntry target_client;
3848   SilcChannelClientEntry chl;
3849   SilcBuffer packet, idp;
3850   unsigned char *tmp_id, *tmp_ch_id, *tmp_mask;
3851   uint32 target_mask, sender_mask = 0, tmp_len, tmp_ch_len;
3852   int notify = FALSE;
3853   uint16 ident = silc_command_get_ident(cmd->payload);
3854
3855   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_CUMODE, cmd, 3, 4);
3856
3857   /* Get Channel ID */
3858   tmp_ch_id = silc_argument_get_arg_type(cmd->args, 1, &tmp_ch_len);
3859   if (!tmp_ch_id) {
3860     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3861                                           SILC_STATUS_ERR_NO_CHANNEL_ID);
3862     goto out;
3863   }
3864   channel_id = silc_id_payload_parse_id(tmp_ch_id, tmp_ch_len);
3865   if (!channel_id) {
3866     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3867                                           SILC_STATUS_ERR_NO_CHANNEL_ID);
3868     goto out;
3869   }
3870
3871   /* Get channel entry */
3872   channel = silc_idlist_find_channel_by_id(server->local_list,
3873                                            channel_id, NULL);
3874   if (!channel) {
3875     channel = silc_idlist_find_channel_by_id(server->global_list,
3876                                              channel_id, NULL);
3877     if (!channel) {
3878       silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3879                                             SILC_STATUS_ERR_NO_SUCH_CHANNEL);
3880       goto out;
3881     }
3882   }
3883
3884   /* Check whether sender is on the channel */
3885   if (!silc_server_client_on_channel(client, channel)) {
3886     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3887                                           SILC_STATUS_ERR_NOT_ON_CHANNEL);
3888     goto out;
3889   }
3890
3891   /* Check that client has rights to change other's rights */
3892   silc_hash_table_find(channel->user_list, client, NULL, (void *)&chl);
3893   sender_mask = chl->mode;
3894
3895   /* Get the target client's channel mode mask */
3896   tmp_mask = silc_argument_get_arg_type(cmd->args, 2, NULL);
3897   if (!tmp_mask) {
3898     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3899                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
3900     goto out;
3901   }
3902   SILC_GET32_MSB(target_mask, tmp_mask);
3903
3904   /* Get target Client ID */
3905   tmp_id = silc_argument_get_arg_type(cmd->args, 3, &tmp_len);
3906   if (!tmp_id) {
3907     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3908                                           SILC_STATUS_ERR_NO_CLIENT_ID);
3909     goto out;
3910   }
3911   client_id = silc_id_payload_parse_id(tmp_id, tmp_len);
3912   if (!client_id) {
3913     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3914                                           SILC_STATUS_ERR_NO_CLIENT_ID);
3915     goto out;
3916   }
3917
3918   /* Get target client's entry */
3919   target_client = silc_idlist_find_client_by_id(server->local_list,
3920                                                 client_id, NULL);
3921   if (!target_client) {
3922     target_client = silc_idlist_find_client_by_id(server->global_list,
3923                                                   client_id, NULL);
3924   }
3925
3926   if (target_client != client &&
3927       !(sender_mask & SILC_CHANNEL_UMODE_CHANFO) &&
3928       !(sender_mask & SILC_CHANNEL_UMODE_CHANOP)) {
3929     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3930                                           SILC_STATUS_ERR_NO_CHANNEL_PRIV);
3931     goto out;
3932   }
3933
3934   /* Check whether target client is on the channel */
3935   if (target_client != client) {
3936     if (!silc_server_client_on_channel(target_client, channel)) {
3937       silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3938                                  SILC_STATUS_ERR_USER_NOT_ON_CHANNEL);
3939       goto out;
3940     }
3941
3942     /* Get entry to the channel user list */
3943     silc_hash_table_find(channel->user_list, target_client, NULL,
3944                          (void *)&chl);
3945   }
3946
3947   /*
3948    * Change the mode
3949    */
3950
3951   /* If the target client is founder, no one else can change their mode
3952      but themselves. */
3953   if (chl->mode & SILC_CHANNEL_UMODE_CHANFO && chl->client != target_client) {
3954     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3955                                           SILC_STATUS_ERR_NOT_YOU);
3956     goto out;
3957   }
3958
3959   if (target_mask & SILC_CHANNEL_UMODE_CHANFO) {
3960     /* The client tries to claim the founder rights. */
3961     unsigned char *tmp_auth;
3962     uint32 tmp_auth_len, auth_len;
3963     void *auth;
3964
3965     if (target_client != client) {
3966       silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3967                                             SILC_STATUS_ERR_NOT_YOU);
3968       goto out;
3969     }
3970
3971     if (!(channel->mode & SILC_CHANNEL_MODE_FOUNDER_AUTH) ||
3972         !channel->founder_key) {
3973       silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3974                                             SILC_STATUS_ERR_NOT_YOU);
3975       goto out;
3976     }
3977
3978     tmp_auth = silc_argument_get_arg_type(cmd->args, 4, &tmp_auth_len);
3979     if (!tmp_auth) {
3980       silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3981                                             SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
3982       goto out;
3983     }
3984
3985     auth = (channel->founder_method == SILC_AUTH_PASSWORD ?
3986             (void *)channel->founder_passwd : (void *)channel->founder_key);
3987     auth_len = (channel->founder_method == SILC_AUTH_PASSWORD ?
3988                 channel->founder_passwd_len : 0);
3989
3990     if (!silc_auth_verify_data(tmp_auth, tmp_auth_len,
3991                                channel->founder_method, auth, auth_len,
3992                                idata->hash, client->id, SILC_ID_CLIENT)) {
3993       silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3994                                             SILC_STATUS_ERR_AUTH_FAILED);
3995       goto out;
3996     }
3997
3998     sender_mask = chl->mode |= SILC_CHANNEL_UMODE_CHANFO;
3999     notify = TRUE;
4000   } else {
4001     if (chl->mode & SILC_CHANNEL_UMODE_CHANFO) {
4002       if (target_client == client) {
4003         /* Remove channel founder rights from itself */
4004         chl->mode &= ~SILC_CHANNEL_UMODE_CHANFO;
4005         notify = TRUE;
4006       } else {
4007         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
4008                                               SILC_STATUS_ERR_NOT_YOU);
4009         goto out;
4010       }
4011     }
4012   }
4013
4014   if (target_mask & SILC_CHANNEL_UMODE_CHANOP) {
4015     /* Promote to operator */
4016     if (!(chl->mode & SILC_CHANNEL_UMODE_CHANOP)) {
4017       if (!(sender_mask & SILC_CHANNEL_UMODE_CHANOP) &&
4018           !(sender_mask & SILC_CHANNEL_UMODE_CHANFO)) {
4019         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
4020                                               SILC_STATUS_ERR_NO_CHANNEL_PRIV);
4021         goto out;
4022       }
4023
4024       chl->mode |= SILC_CHANNEL_UMODE_CHANOP;
4025       notify = TRUE;
4026     }
4027   } else {
4028     if (chl->mode & SILC_CHANNEL_UMODE_CHANOP) {
4029       if (!(sender_mask & SILC_CHANNEL_UMODE_CHANOP) &&
4030           !(sender_mask & SILC_CHANNEL_UMODE_CHANFO)) {
4031         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
4032                                               SILC_STATUS_ERR_NO_CHANNEL_PRIV);
4033         goto out;
4034       }
4035
4036       /* Demote to normal user */
4037       chl->mode &= ~SILC_CHANNEL_UMODE_CHANOP;
4038       notify = TRUE;
4039     }
4040   }
4041
4042   idp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
4043   tmp_id = silc_argument_get_arg_type(cmd->args, 3, &tmp_len);
4044
4045   /* Send notify to channel, notify only if mode was actually changed. */
4046   if (notify) {
4047     silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
4048                                        SILC_NOTIFY_TYPE_CUMODE_CHANGE, 3,
4049                                        idp->data, idp->len,
4050                                        tmp_mask, 4,
4051                                        tmp_id, tmp_len);
4052
4053     /* Set CUMODE notify type to network */
4054     if (!server->standalone)
4055       silc_server_send_notify_cumode(server, server->router->connection,
4056                                      server->server_type == SILC_ROUTER ?
4057                                      TRUE : FALSE, channel,
4058                                      target_mask, client->id,
4059                                      SILC_ID_CLIENT,
4060                                      target_client->id);
4061   }
4062
4063   /* Send command reply to sender */
4064   packet = silc_command_reply_payload_encode_va(SILC_COMMAND_CUMODE,
4065                                                 SILC_STATUS_OK, ident, 3,
4066                                                 2, tmp_mask, 4,
4067                                                 3, tmp_ch_id, tmp_ch_len,
4068                                                 4, tmp_id, tmp_len);
4069   silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0,
4070                           packet->data, packet->len, FALSE);
4071
4072   silc_buffer_free(packet);
4073   silc_free(channel_id);
4074   silc_free(client_id);
4075   silc_buffer_free(idp);
4076
4077  out:
4078   silc_server_command_free(cmd);
4079 }
4080
4081 /* Server side of KICK command. Kicks client out of channel. */
4082
4083 SILC_SERVER_CMD_FUNC(kick)
4084 {
4085   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
4086   SilcServer server = cmd->server;
4087   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
4088   SilcClientEntry target_client;
4089   SilcChannelID *channel_id;
4090   SilcClientID *client_id;
4091   SilcChannelEntry channel;
4092   SilcChannelClientEntry chl;
4093   SilcBuffer idp;
4094   uint32 tmp_len;
4095   unsigned char *tmp, *comment;
4096
4097   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_LEAVE, cmd, 1, 3);
4098
4099   /* Get Channel ID */
4100   tmp = silc_argument_get_arg_type(cmd->args, 1, &tmp_len);
4101   if (!tmp) {
4102     silc_server_command_send_status_reply(cmd, SILC_COMMAND_KICK,
4103                                           SILC_STATUS_ERR_NO_CHANNEL_ID);
4104     goto out;
4105   }
4106   channel_id = silc_id_payload_parse_id(tmp, tmp_len);
4107   if (!channel_id) {
4108     silc_server_command_send_status_reply(cmd, SILC_COMMAND_KICK,
4109                                           SILC_STATUS_ERR_NO_CHANNEL_ID);
4110     goto out;
4111   }
4112
4113   /* Get channel entry */
4114   channel = silc_idlist_find_channel_by_id(server->local_list,
4115                                            channel_id, NULL);
4116   if (!channel) {
4117     channel = silc_idlist_find_channel_by_id(server->local_list,
4118                                              channel_id, NULL);
4119     if (!channel) {
4120       silc_server_command_send_status_reply(cmd, SILC_COMMAND_KICK,
4121                                             SILC_STATUS_ERR_NO_SUCH_CHANNEL);
4122       goto out;
4123     }
4124   }
4125
4126   /* Check whether sender is on the channel */
4127   if (!silc_server_client_on_channel(client, channel)) {
4128     silc_server_command_send_status_reply(cmd, SILC_COMMAND_KICK,
4129                                           SILC_STATUS_ERR_NOT_ON_CHANNEL);
4130     goto out;
4131   }
4132
4133   /* Check that the kicker is channel operator or channel founder */
4134   silc_hash_table_find(channel->user_list, client, NULL, (void *)&chl);
4135   if (chl->mode == SILC_CHANNEL_UMODE_NONE) {
4136     silc_server_command_send_status_reply(cmd, SILC_COMMAND_KICK,
4137                                           SILC_STATUS_ERR_NO_CHANNEL_PRIV);
4138     goto out;
4139   }
4140
4141   /* Get target Client ID */
4142   tmp = silc_argument_get_arg_type(cmd->args, 2, &tmp_len);
4143   if (!tmp) {
4144     silc_server_command_send_status_reply(cmd, SILC_COMMAND_KICK,
4145                                           SILC_STATUS_ERR_NO_CLIENT_ID);
4146     goto out;
4147   }
4148   client_id = silc_id_payload_parse_id(tmp, tmp_len);
4149   if (!client_id) {
4150     silc_server_command_send_status_reply(cmd, SILC_COMMAND_KICK,
4151                                           SILC_STATUS_ERR_NO_CLIENT_ID);
4152     goto out;
4153   }
4154
4155   /* Get target client's entry */
4156   target_client = silc_idlist_find_client_by_id(server->local_list,
4157                                                 client_id, NULL);
4158   if (!target_client) {
4159     target_client = silc_idlist_find_client_by_id(server->global_list,
4160                                                   client_id, NULL);
4161   }
4162
4163   /* Check that the target client is not channel founder. Channel founder
4164      cannot be kicked from the channel. */
4165   silc_hash_table_find(channel->user_list, target_client, NULL, (void *)&chl);
4166   if (chl->mode & SILC_CHANNEL_UMODE_CHANFO) {
4167     silc_server_command_send_status_reply(cmd, SILC_COMMAND_KICK,
4168                                           SILC_STATUS_ERR_NO_CHANNEL_FOPRIV);
4169     goto out;
4170   }
4171
4172   /* Check whether target client is on the channel */
4173   if (!silc_server_client_on_channel(target_client, channel)) {
4174     silc_server_command_send_status_reply(cmd, SILC_COMMAND_KICK,
4175                                           SILC_STATUS_ERR_USER_NOT_ON_CHANNEL);
4176     goto out;
4177   }
4178
4179   /* Get comment */
4180   tmp_len = 0;
4181   comment = silc_argument_get_arg_type(cmd->args, 3, &tmp_len);
4182   if (tmp_len > 128)
4183     comment = NULL;
4184
4185   /* Send command reply to sender */
4186   silc_server_command_send_status_reply(cmd, SILC_COMMAND_KICK,
4187                                         SILC_STATUS_OK);
4188
4189   /* Send KICKED notify to local clients on the channel */
4190   idp = silc_id_payload_encode(target_client->id, SILC_ID_CLIENT);
4191   silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
4192                                      SILC_NOTIFY_TYPE_KICKED,
4193                                      comment ? 2 : 1,
4194                                      idp->data, idp->len,
4195                                      comment, comment ? strlen(comment) : 0);
4196   silc_buffer_free(idp);
4197
4198   /* Remove the client from the channel. If the channel does not exist
4199      after removing the client then the client kicked itself off the channel
4200      and we don't have to send anything after that. */
4201   if (!silc_server_remove_from_one_channel(server, NULL, channel,
4202                                            target_client, FALSE))
4203     goto out;
4204
4205   /* Send KICKED notify to primary route */
4206   if (!server->standalone)
4207     silc_server_send_notify_kicked(server, server->router->connection,
4208                                    server->server_type == SILC_ROUTER ?
4209                                    TRUE : FALSE, channel,
4210                                    target_client->id, comment);
4211
4212   if (!(channel->mode & SILC_CHANNEL_MODE_PRIVKEY)) {
4213     /* Re-generate channel key */
4214     if (!silc_server_create_channel_key(server, channel, 0))
4215       goto out;
4216
4217     /* Send the channel key to the channel. The key of course is not sent
4218        to the client who was kicked off the channel. */
4219     silc_server_send_channel_key(server, target_client->connection, channel,
4220                                  server->server_type == SILC_ROUTER ?
4221                                  FALSE : !server->standalone);
4222   }
4223
4224  out:
4225   silc_server_command_free(cmd);
4226 }
4227
4228 /* Server side of OPER command. Client uses this comand to obtain server
4229    operator privileges to this server/router. */
4230
4231 SILC_SERVER_CMD_FUNC(oper)
4232 {
4233   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
4234   SilcServer server = cmd->server;
4235   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
4236   unsigned char *username, *auth;
4237   uint32 tmp_len;
4238   SilcServerConfigSectionAdminConnection *admin;
4239   SilcIDListData idata = (SilcIDListData)client;
4240
4241   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_OPER, cmd, 1, 2);
4242
4243   if (!client || cmd->sock->type != SILC_SOCKET_TYPE_CLIENT)
4244     goto out;
4245
4246   /* Get the username */
4247   username = silc_argument_get_arg_type(cmd->args, 1, &tmp_len);
4248   if (!username) {
4249     silc_server_command_send_status_reply(cmd, SILC_COMMAND_OPER,
4250                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
4251     goto out;
4252   }
4253
4254   /* Get the admin configuration */
4255   admin = silc_server_config_find_admin(server->config, cmd->sock->ip,
4256                                         username, client->nickname);
4257   if (!admin) {
4258     admin = silc_server_config_find_admin(server->config, cmd->sock->hostname,
4259                                           username, client->nickname);
4260     if (!admin) {
4261       silc_server_command_send_status_reply(cmd, SILC_COMMAND_OPER,
4262                                             SILC_STATUS_ERR_AUTH_FAILED);
4263       goto out;
4264     }
4265   }
4266
4267   /* Get the authentication payload */
4268   auth = silc_argument_get_arg_type(cmd->args, 2, &tmp_len);
4269   if (!auth) {
4270     silc_server_command_send_status_reply(cmd, SILC_COMMAND_OPER,
4271                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
4272     goto out;
4273   }
4274
4275   /* Verify the authentication data */
4276   if (!silc_auth_verify_data(auth, tmp_len, admin->auth_meth,
4277                              admin->auth_data, admin->auth_data_len,
4278                              idata->hash, client->id, SILC_ID_CLIENT)) {
4279     silc_server_command_send_status_reply(cmd, SILC_COMMAND_OPER,
4280                                           SILC_STATUS_ERR_AUTH_FAILED);
4281     goto out;
4282   }
4283
4284   /* Client is now server operator */
4285   client->mode |= SILC_UMODE_SERVER_OPERATOR;
4286
4287   /* Send UMODE change to primary router */
4288   if (!server->standalone)
4289     silc_server_send_notify_umode(server, server->router->connection, TRUE,
4290                                   client->id, client->mode);
4291
4292   /* Send reply to the sender */
4293   silc_server_command_send_status_reply(cmd, SILC_COMMAND_OPER,
4294                                         SILC_STATUS_OK);
4295
4296  out:
4297   silc_server_command_free(cmd);
4298 }
4299
4300 /* Server side of SILCOPER command. Client uses this comand to obtain router
4301    operator privileges to this router. */
4302
4303 SILC_SERVER_CMD_FUNC(silcoper)
4304 {
4305   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
4306   SilcServer server = cmd->server;
4307   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
4308   unsigned char *username, *auth;
4309   uint32 tmp_len;
4310   SilcServerConfigSectionAdminConnection *admin;
4311   SilcIDListData idata = (SilcIDListData)client;
4312
4313   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_SILCOPER, cmd, 1, 2);
4314
4315   if (!client || cmd->sock->type != SILC_SOCKET_TYPE_CLIENT)
4316     goto out;
4317
4318   if (server->server_type == SILC_SERVER) {
4319     silc_server_command_send_status_reply(cmd, SILC_COMMAND_SILCOPER,
4320                                           SILC_STATUS_ERR_AUTH_FAILED);
4321     goto out;
4322   }
4323
4324   /* Get the username */
4325   username = silc_argument_get_arg_type(cmd->args, 1, &tmp_len);
4326   if (!username) {
4327     silc_server_command_send_status_reply(cmd, SILC_COMMAND_SILCOPER,
4328                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
4329     goto out;
4330   }
4331
4332   /* Get the admin configuration */
4333   admin = silc_server_config_find_admin(server->config, cmd->sock->ip,
4334                                         username, client->nickname);
4335   if (!admin) {
4336     admin = silc_server_config_find_admin(server->config, cmd->sock->hostname,
4337                                           username, client->nickname);
4338     if (!admin) {
4339       silc_server_command_send_status_reply(cmd, SILC_COMMAND_SILCOPER,
4340                                             SILC_STATUS_ERR_AUTH_FAILED);
4341       goto out;
4342     }
4343   }
4344
4345   /* Get the authentication payload */
4346   auth = silc_argument_get_arg_type(cmd->args, 2, &tmp_len);
4347   if (!auth) {
4348     silc_server_command_send_status_reply(cmd, SILC_COMMAND_SILCOPER,
4349                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
4350     goto out;
4351   }
4352
4353   /* Verify the authentication data */
4354   if (!silc_auth_verify_data(auth, tmp_len, admin->auth_meth,
4355                              admin->auth_data, admin->auth_data_len,
4356                              idata->hash, client->id, SILC_ID_CLIENT)) {
4357     silc_server_command_send_status_reply(cmd, SILC_COMMAND_SILCOPER,
4358                                           SILC_STATUS_ERR_AUTH_FAILED);
4359     goto out;
4360   }
4361
4362   /* Client is now router operator */
4363   client->mode |= SILC_UMODE_ROUTER_OPERATOR;
4364
4365   /* Send UMODE change to primary router */
4366   if (!server->standalone)
4367     silc_server_send_notify_umode(server, server->router->connection, TRUE,
4368                                   client->id, client->mode);
4369
4370   /* Send reply to the sender */
4371   silc_server_command_send_status_reply(cmd, SILC_COMMAND_SILCOPER,
4372                                         SILC_STATUS_OK);
4373
4374  out:
4375   silc_server_command_free(cmd);
4376 }
4377
4378 /* Server side command of CONNECT. Connects us to the specified remote
4379    server or router. */
4380
4381 SILC_SERVER_CMD_FUNC(connect)
4382 {
4383   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
4384   SilcServer server = cmd->server;
4385   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
4386   unsigned char *tmp, *host;
4387   uint32 tmp_len;
4388   uint32 port = SILC_PORT;
4389
4390   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_CONNECT, cmd, 1, 2);
4391
4392   if (!client || cmd->sock->type != SILC_SOCKET_TYPE_CLIENT)
4393     goto out;
4394
4395   /* Check whether client has the permissions. */
4396   if (client->mode == SILC_UMODE_NONE) {
4397     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CONNECT,
4398                                           SILC_STATUS_ERR_NO_SERVER_PRIV);
4399     goto out;
4400   }
4401
4402   if (server->server_type == SILC_ROUTER &&
4403       client->mode & SILC_UMODE_SERVER_OPERATOR) {
4404     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CONNECT,
4405                                           SILC_STATUS_ERR_NO_ROUTER_PRIV);
4406     goto out;
4407   }
4408
4409   /* Get the remote server */
4410   host = silc_argument_get_arg_type(cmd->args, 1, &tmp_len);
4411   if (!host) {
4412     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CONNECT,
4413                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
4414     goto out;
4415   }
4416
4417   /* Get port */
4418   tmp = silc_argument_get_arg_type(cmd->args, 2, &tmp_len);
4419   if (tmp)
4420     SILC_GET32_MSB(port, tmp);
4421
4422   /* Create the connection. It is done with timeout and is async. */
4423   silc_server_create_connection(server, host, port);
4424
4425   /* Send reply to the sender */
4426   silc_server_command_send_status_reply(cmd, SILC_COMMAND_CONNECT,
4427                                         SILC_STATUS_OK);
4428
4429  out:
4430   silc_server_command_free(cmd);
4431 }
4432
4433 /* Server side of command BAN. This is used to manage the ban list of the
4434    channel. To add clients and remove clients from the ban list. */
4435
4436 SILC_SERVER_CMD_FUNC(ban)
4437 {
4438   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
4439   SilcServer server = cmd->server;
4440   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
4441   SilcBuffer packet;
4442   SilcChannelEntry channel;
4443   SilcChannelClientEntry chl;
4444   SilcChannelID *channel_id = NULL;
4445   unsigned char *id, *add, *del;
4446   uint32 id_len, tmp_len;
4447   uint16 ident = silc_command_get_ident(cmd->payload);
4448
4449   if (cmd->sock->type != SILC_SOCKET_TYPE_CLIENT)
4450     goto out;
4451
4452   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_BAN, cmd, 0, 3);
4453
4454   /* Get Channel ID */
4455   id = silc_argument_get_arg_type(cmd->args, 1, &id_len);
4456   if (id) {
4457     channel_id = silc_id_payload_parse_id(id, id_len);
4458     if (!channel_id) {
4459       silc_server_command_send_status_reply(cmd, SILC_COMMAND_BAN,
4460                                             SILC_STATUS_ERR_NO_CHANNEL_ID);
4461       goto out;
4462     }
4463   }
4464
4465   /* Get channel entry. The server must know about the channel since the
4466      client is expected to be on the channel. */
4467   channel = silc_idlist_find_channel_by_id(server->local_list,
4468                                            channel_id, NULL);
4469   if (!channel) {
4470     channel = silc_idlist_find_channel_by_id(server->global_list,
4471                                              channel_id, NULL);
4472     if (!channel) {
4473       silc_server_command_send_status_reply(cmd, SILC_COMMAND_BAN,
4474                                             SILC_STATUS_ERR_NO_SUCH_CHANNEL);
4475       goto out;
4476     }
4477   }
4478
4479   /* Check whether this client is on the channel */
4480   if (!silc_server_client_on_channel(client, channel)) {
4481     silc_server_command_send_status_reply(cmd, SILC_COMMAND_BAN,
4482                                           SILC_STATUS_ERR_NOT_ON_CHANNEL);
4483     goto out;
4484   }
4485
4486   /* Get entry to the channel user list */
4487   silc_hash_table_find(channel->user_list, client, NULL, (void *)&chl);
4488
4489   /* The client must be at least channel operator. */
4490   if (!(chl->mode & SILC_CHANNEL_UMODE_CHANOP)) {
4491     silc_server_command_send_status_reply(cmd, SILC_COMMAND_BAN,
4492                                           SILC_STATUS_ERR_NO_CHANNEL_PRIV);
4493     goto out;
4494   }
4495
4496   /* Get the new ban and add it to the ban list */
4497   add = silc_argument_get_arg_type(cmd->args, 2, &tmp_len);
4498   if (add) {
4499     if (!channel->ban_list)
4500       channel->ban_list = silc_calloc(tmp_len + 2, sizeof(*channel->ban_list));
4501     else
4502       channel->ban_list = silc_realloc(channel->ban_list,
4503                                        sizeof(*channel->ban_list) *
4504                                        (tmp_len +
4505                                         strlen(channel->ban_list) + 2));
4506     if (add[tmp_len - 1] == ',')
4507       add[tmp_len - 1] = '\0';
4508
4509     strncat(channel->ban_list, add, tmp_len);
4510     strncat(channel->ban_list, ",", 1);
4511   }
4512
4513   /* Get the ban to be removed and remove it from the list */
4514   del = silc_argument_get_arg_type(cmd->args, 3, &tmp_len);
4515   if (del && channel->ban_list) {
4516     char *start, *end, *n;
4517
4518     if (!strncmp(channel->ban_list, del, strlen(channel->ban_list) - 1)) {
4519       silc_free(channel->ban_list);
4520       channel->ban_list = NULL;
4521     } else {
4522       start = strstr(channel->ban_list, del);
4523       if (start && strlen(start) >= tmp_len) {
4524         end = start + tmp_len;
4525         n = silc_calloc(strlen(channel->ban_list) - tmp_len, sizeof(*n));
4526         strncat(n, channel->ban_list, start - channel->ban_list);
4527         strncat(n, end + 1, ((channel->ban_list + strlen(channel->ban_list)) -
4528                              end) - 1);
4529         silc_free(channel->ban_list);
4530         channel->ban_list = n;
4531       }
4532     }
4533   }
4534
4535   /* Send the BAN notify type to our primary router. */
4536   if (!server->standalone && (add || del))
4537     silc_server_send_notify_ban(server, server->router->connection,
4538                                 server->server_type == SILC_ROUTER ?
4539                                 TRUE : FALSE, channel, add, del);
4540
4541   /* Send the reply back to the client */
4542   if (channel->ban_list)
4543     packet =
4544       silc_command_reply_payload_encode_va(SILC_COMMAND_BAN,
4545                                            SILC_STATUS_OK, ident, 2,
4546                                            2, id, id_len,
4547                                            3, channel->ban_list,
4548                                            strlen(channel->ban_list) - 1);
4549   else
4550     packet =
4551       silc_command_reply_payload_encode_va(SILC_COMMAND_BAN,
4552                                            SILC_STATUS_OK, ident, 1,
4553                                            2, id, id_len);
4554
4555   silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0,
4556                           packet->data, packet->len, FALSE);
4557
4558   silc_buffer_free(packet);
4559
4560  out:
4561   if (channel_id)
4562     silc_free(channel_id);
4563   silc_server_command_free(cmd);
4564 }
4565
4566 /* Server side command of CLOSE. Closes connection to a specified server. */
4567
4568 SILC_SERVER_CMD_FUNC(close)
4569 {
4570   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
4571   SilcServer server = cmd->server;
4572   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
4573   SilcServerEntry server_entry;
4574   SilcSocketConnection sock;
4575   unsigned char *tmp;
4576   uint32 tmp_len;
4577   unsigned char *name;
4578   uint32 port = SILC_PORT;
4579
4580   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_CLOSE, cmd, 1, 2);
4581
4582   if (!client || cmd->sock->type != SILC_SOCKET_TYPE_CLIENT)
4583     goto out;
4584
4585   /* Check whether client has the permissions. */
4586   if (client->mode == SILC_UMODE_NONE) {
4587     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CLOSE,
4588                                           SILC_STATUS_ERR_NO_SERVER_PRIV);
4589     goto out;
4590   }
4591
4592   /* Get the remote server */
4593   name = silc_argument_get_arg_type(cmd->args, 1, &tmp_len);
4594   if (!name) {
4595     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CLOSE,
4596                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
4597     goto out;
4598   }
4599
4600   /* Get port */
4601   tmp = silc_argument_get_arg_type(cmd->args, 2, &tmp_len);
4602   if (tmp)
4603     SILC_GET32_MSB(port, tmp);
4604
4605   server_entry = silc_idlist_find_server_by_conn(server->local_list,
4606                                                  name, port, NULL);
4607   if (!server_entry) {
4608     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CLOSE,
4609                                           SILC_STATUS_ERR_NO_SERVER_ID);
4610     goto out;
4611   }
4612
4613   /* Send reply to the sender */
4614   silc_server_command_send_status_reply(cmd, SILC_COMMAND_CLOSE,
4615                                         SILC_STATUS_OK);
4616
4617   /* Close the connection to the server */
4618   sock = (SilcSocketConnection)server_entry->connection;
4619   silc_server_free_sock_user_data(server, sock);
4620   silc_server_close_connection(server, sock);
4621
4622  out:
4623   silc_server_command_free(cmd);
4624 }
4625
4626 /* Server side command of SHUTDOWN. Shutdowns the server and closes all
4627    active connections. */
4628
4629 SILC_SERVER_CMD_FUNC(shutdown)
4630 {
4631   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
4632   SilcServer server = cmd->server;
4633   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
4634
4635   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_SHUTDOWN, cmd, 0, 0);
4636
4637   if (!client || cmd->sock->type != SILC_SOCKET_TYPE_CLIENT)
4638     goto out;
4639
4640   /* Check whether client has the permission. */
4641   if (client->mode == SILC_UMODE_NONE) {
4642     silc_server_command_send_status_reply(cmd, SILC_COMMAND_SHUTDOWN,
4643                                           SILC_STATUS_ERR_NO_SERVER_PRIV);
4644     goto out;
4645   }
4646
4647   /* Send reply to the sender */
4648   silc_server_command_send_status_reply(cmd, SILC_COMMAND_SHUTDOWN,
4649                                         SILC_STATUS_OK);
4650
4651   /* Then, gracefully, or not, bring the server down. */
4652   silc_server_stop(server);
4653   exit(0);
4654
4655  out:
4656   silc_server_command_free(cmd);
4657 }
4658
4659 /* Server side command of LEAVE. Removes client from a channel. */
4660
4661 SILC_SERVER_CMD_FUNC(leave)
4662 {
4663   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
4664   SilcServer server = cmd->server;
4665   SilcSocketConnection sock = cmd->sock;
4666   SilcClientEntry id_entry = (SilcClientEntry)cmd->sock->user_data;
4667   SilcChannelID *id = NULL;
4668   SilcChannelEntry channel;
4669   uint32 len;
4670   unsigned char *tmp;
4671
4672   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_LEAVE, cmd, 1, 2);
4673
4674   /* Get Channel ID */
4675   tmp = silc_argument_get_arg_type(cmd->args, 1, &len);
4676   if (!tmp) {
4677     silc_server_command_send_status_reply(cmd, SILC_COMMAND_LEAVE,
4678                                           SILC_STATUS_ERR_NO_CHANNEL_ID);
4679     goto out;
4680   }
4681   id = silc_id_payload_parse_id(tmp, len);
4682   if (!id) {
4683     silc_server_command_send_status_reply(cmd, SILC_COMMAND_LEAVE,
4684                                           SILC_STATUS_ERR_NO_CHANNEL_ID);
4685     goto out;
4686   }
4687
4688   /* Get channel entry */
4689   channel = silc_idlist_find_channel_by_id(server->local_list, id, NULL);
4690   if (!channel) {
4691     channel = silc_idlist_find_channel_by_id(server->global_list, id, NULL);
4692     if (!channel) {
4693       silc_server_command_send_status_reply(cmd, SILC_COMMAND_LEAVE,
4694                                             SILC_STATUS_ERR_NO_SUCH_CHANNEL);
4695       goto out;
4696     }
4697   }
4698
4699   /* Check whether this client is on the channel */
4700   if (!silc_server_client_on_channel(id_entry, channel)) {
4701     silc_server_command_send_status_reply(cmd, SILC_COMMAND_LEAVE,
4702                                           SILC_STATUS_ERR_NOT_ON_CHANNEL);
4703     goto out;
4704   }
4705
4706   /* Notify routers that they should remove this client from their list
4707      of clients on the channel. Send LEAVE notify type. */
4708   if (!server->standalone)
4709     silc_server_send_notify_leave(server, server->router->connection,
4710                                   server->server_type == SILC_ROUTER ?
4711                                   TRUE : FALSE, channel, id_entry->id);
4712
4713   silc_server_command_send_status_reply(cmd, SILC_COMMAND_LEAVE,
4714                                         SILC_STATUS_OK);
4715
4716   /* Remove client from channel */
4717   if (!silc_server_remove_from_one_channel(server, sock, channel, id_entry,
4718                                            TRUE))
4719     /* If the channel does not exist anymore we won't send anything */
4720     goto out;
4721
4722   if (!(channel->mode & SILC_CHANNEL_MODE_PRIVKEY)) {
4723     /* Re-generate channel key */
4724     if (!silc_server_create_channel_key(server, channel, 0))
4725       goto out;
4726
4727     /* Send the channel key */
4728     silc_server_send_channel_key(server, NULL, channel,
4729                                  server->server_type == SILC_ROUTER ?
4730                                  FALSE : !server->standalone);
4731   }
4732
4733  out:
4734   if (id)
4735     silc_free(id);
4736   silc_server_command_free(cmd);
4737 }
4738
4739 /* Server side of command USERS. Resolves clients and their USERS currently
4740    joined on the requested channel. The list of Client ID's and their modes
4741    on the channel is sent back. */
4742
4743 SILC_SERVER_CMD_FUNC(users)
4744 {
4745   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
4746   SilcServer server = cmd->server;
4747   SilcChannelEntry channel;
4748   SilcChannelID *id = NULL;
4749   SilcBuffer packet, idp;
4750   unsigned char *channel_id;
4751   uint32 channel_id_len;
4752   SilcBuffer client_id_list;
4753   SilcBuffer client_mode_list;
4754   unsigned char lc[4];
4755   uint32 list_count = 0;
4756   uint16 ident = silc_command_get_ident(cmd->payload);
4757   char *channel_name;
4758
4759   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_USERS, cmd, 1, 2);
4760
4761   /* Get Channel ID */
4762   channel_id = silc_argument_get_arg_type(cmd->args, 1, &channel_id_len);
4763
4764   /* Get channel name */
4765   channel_name = silc_argument_get_arg_type(cmd->args, 2, NULL);
4766
4767   if (!channel_id && !channel_name) {
4768     silc_server_command_send_status_reply(cmd, SILC_COMMAND_USERS,
4769                                           SILC_STATUS_ERR_NO_CHANNEL_ID);
4770     goto out;
4771   }
4772
4773   if (channel_id) {
4774     id = silc_id_payload_parse_id(channel_id, channel_id_len);
4775     if (!id) {
4776       silc_server_command_send_status_reply(cmd, SILC_COMMAND_USERS,
4777                                             SILC_STATUS_ERR_NO_CHANNEL_ID);
4778       goto out;
4779     }
4780   }
4781
4782   /* If we are server and we don't know about this channel we will send
4783      the command to our router. If we know about the channel then we also
4784      have the list of users already. */
4785   if (id)
4786     channel = silc_idlist_find_channel_by_id(server->local_list, id, NULL);
4787   else
4788     channel = silc_idlist_find_channel_by_name(server->local_list,
4789                                                channel_name, NULL);
4790
4791   if (!channel) {
4792     if (server->server_type == SILC_SERVER && !server->standalone &&
4793         !cmd->pending) {
4794       SilcBuffer tmpbuf;
4795
4796       silc_command_set_ident(cmd->payload, silc_rng_get_rn16(server->rng));
4797       tmpbuf = silc_command_payload_encode_payload(cmd->payload);
4798
4799       /* Send USERS command */
4800       silc_server_packet_send(server, server->router->connection,
4801                               SILC_PACKET_COMMAND, cmd->packet->flags,
4802                               tmpbuf->data, tmpbuf->len, TRUE);
4803
4804       /* Reprocess this packet after received reply */
4805       silc_server_command_pending(server, SILC_COMMAND_USERS,
4806                                   silc_command_get_ident(cmd->payload),
4807                                   silc_server_command_destructor,
4808                                   silc_server_command_users,
4809                                   silc_server_command_dup(cmd));
4810       cmd->pending = TRUE;
4811       silc_command_set_ident(cmd->payload, ident);
4812
4813       silc_buffer_free(tmpbuf);
4814       silc_free(id);
4815       return;
4816     }
4817
4818     /* Check the global list as well. */
4819     if (id)
4820       channel = silc_idlist_find_channel_by_id(server->global_list, id, NULL);
4821     else
4822       channel = silc_idlist_find_channel_by_name(server->global_list,
4823                                                  channel_name, NULL);
4824     if (!channel) {
4825       /* Channel really does not exist */
4826       silc_server_command_send_status_reply(cmd, SILC_COMMAND_USERS,
4827                                             SILC_STATUS_ERR_NO_SUCH_CHANNEL);
4828       goto out;
4829     }
4830   }
4831
4832   /* If the channel is private or secret do not send anything */
4833   if (channel->mode & (SILC_CHANNEL_MODE_PRIVATE | SILC_CHANNEL_MODE_SECRET)) {
4834     silc_server_command_send_status_reply(cmd, SILC_COMMAND_USERS,
4835                                           SILC_STATUS_ERR_NO_SUCH_CHANNEL);
4836     goto out;
4837   }
4838
4839   /* Get the users list */
4840   silc_server_get_users_on_channel(server, channel, &client_id_list,
4841                                    &client_mode_list, &list_count);
4842
4843   /* List count */
4844   SILC_PUT32_MSB(list_count, lc);
4845
4846   /* Send reply */
4847   idp = silc_id_payload_encode(channel->id, SILC_ID_CHANNEL);
4848   packet = silc_command_reply_payload_encode_va(SILC_COMMAND_USERS,
4849                                                 SILC_STATUS_OK, ident, 4,
4850                                                 2, idp->data, idp->len,
4851                                                 3, lc, 4,
4852                                                 4, client_id_list->data,
4853                                                 client_id_list->len,
4854                                                 5, client_mode_list->data,
4855                                                 client_mode_list->len);
4856   silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0,
4857                           packet->data, packet->len, FALSE);
4858
4859   silc_buffer_free(idp);
4860   silc_buffer_free(packet);
4861   silc_buffer_free(client_id_list);
4862   silc_buffer_free(client_mode_list);
4863   if (id)
4864     silc_free(id);
4865
4866  out:
4867   silc_server_command_free(cmd);
4868 }
4869
4870 /* Server side of command GETKEY. This fetches the client's public key
4871    from the server where to the client is connected. */
4872
4873 SILC_SERVER_CMD_FUNC(getkey)
4874 {
4875   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
4876   SilcServer server = cmd->server;
4877   SilcBuffer packet;
4878   SilcClientEntry client;
4879   SilcServerEntry server_entry;
4880   SilcClientID *client_id = NULL;
4881   SilcServerID *server_id = NULL;
4882   SilcIDPayload idp = NULL;
4883   uint16 ident = silc_command_get_ident(cmd->payload);
4884   unsigned char *tmp;
4885   uint32 tmp_len;
4886   SilcBuffer pk;
4887   SilcIdType id_type;
4888
4889   SILC_LOG_DEBUG(("Start"));
4890
4891   tmp = silc_argument_get_arg_type(cmd->args, 1, &tmp_len);
4892   if (!tmp) {
4893     silc_server_command_send_status_reply(cmd, SILC_COMMAND_GETKEY,
4894                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
4895     goto out;
4896   }
4897   idp = silc_id_payload_parse_data(tmp, tmp_len);
4898   if (!idp) {
4899     silc_server_command_send_status_reply(cmd, SILC_COMMAND_GETKEY,
4900                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
4901     goto out;
4902   }
4903
4904   id_type = silc_id_payload_get_type(idp);
4905   if (id_type == SILC_ID_CLIENT) {
4906     client_id = silc_id_payload_get_id(idp);
4907
4908     /* If the client is not found from local list there is no chance it
4909        would be locally connected client so send the command further. */
4910     client = silc_idlist_find_client_by_id(server->local_list,
4911                                            client_id, NULL);
4912     if (!client)
4913       client = silc_idlist_find_client_by_id(server->global_list,
4914                                              client_id, NULL);
4915
4916     if ((!client && !cmd->pending && !server->standalone) ||
4917         (client && !client->connection && !cmd->pending &&
4918          !server->standalone) ||
4919         (client && !client->data.public_key && !cmd->pending &&
4920          !server->standalone)) {
4921       SilcBuffer tmpbuf;
4922       uint16 old_ident;
4923       SilcSocketConnection dest_sock;
4924
4925       dest_sock = silc_server_get_client_route(server, NULL, 0,
4926                                                client_id, NULL);
4927       if (!dest_sock)
4928         goto out;
4929
4930       old_ident = silc_command_get_ident(cmd->payload);
4931       silc_command_set_ident(cmd->payload, silc_rng_get_rn16(server->rng));
4932       tmpbuf = silc_command_payload_encode_payload(cmd->payload);
4933
4934       silc_server_packet_send(server, dest_sock,
4935                               SILC_PACKET_COMMAND, cmd->packet->flags,
4936                               tmpbuf->data, tmpbuf->len, TRUE);
4937
4938       /* Reprocess this packet after received reply from router */
4939       silc_server_command_pending(server, SILC_COMMAND_GETKEY,
4940                                   silc_command_get_ident(cmd->payload),
4941                                   silc_server_command_destructor,
4942                                   silc_server_command_getkey,
4943                                   silc_server_command_dup(cmd));
4944       cmd->pending = TRUE;
4945
4946       silc_command_set_ident(cmd->payload, old_ident);
4947       silc_buffer_free(tmpbuf);
4948       return;
4949     }
4950
4951     if (!client && cmd->pending) {
4952       silc_server_command_send_status_reply(cmd, SILC_COMMAND_GETKEY,
4953                                             SILC_STATUS_ERR_NO_SUCH_CLIENT_ID);
4954       goto out;
4955     }
4956
4957     /* The client is locally connected, just get the public key and
4958        send it back. */
4959     tmp = silc_pkcs_public_key_encode(client->data.public_key, &tmp_len);
4960     pk = silc_buffer_alloc(4 + tmp_len);
4961     silc_buffer_pull_tail(pk, SILC_BUFFER_END(pk));
4962     silc_buffer_format(pk,
4963                        SILC_STR_UI_SHORT(tmp_len),
4964                        SILC_STR_UI_SHORT(SILC_SKE_PK_TYPE_SILC),
4965                        SILC_STR_UI_XNSTRING(tmp, tmp_len),
4966                        SILC_STR_END);
4967     silc_free(tmp);
4968
4969   } else if (id_type == SILC_ID_SERVER) {
4970     server_id = silc_id_payload_get_id(idp);
4971
4972     /* If the server is not found from local list there is no chance it
4973        would be locally connected server so send the command further. */
4974     server_entry = silc_idlist_find_server_by_id(server->local_list,
4975                                                  server_id, NULL);
4976     if (!server_entry)
4977       server_entry = silc_idlist_find_server_by_id(server->global_list,
4978                                                    server_id, NULL);
4979
4980     if ((!server_entry && !cmd->pending && !server->standalone) ||
4981         (server_entry && !server_entry->connection && !cmd->pending &&
4982          !server->standalone) ||
4983         (server_entry && !server_entry->data.public_key && !cmd->pending &&
4984          !server->standalone)) {
4985       SilcBuffer tmpbuf;
4986       uint16 old_ident;
4987
4988       old_ident = silc_command_get_ident(cmd->payload);
4989       silc_command_set_ident(cmd->payload, silc_rng_get_rn16(server->rng));
4990       tmpbuf = silc_command_payload_encode_payload(cmd->payload);
4991
4992       silc_server_packet_send(server, server->router->connection,
4993                               SILC_PACKET_COMMAND, cmd->packet->flags,
4994                               tmpbuf->data, tmpbuf->len, TRUE);
4995
4996       /* Reprocess this packet after received reply from router */
4997       silc_server_command_pending(server, SILC_COMMAND_GETKEY,
4998                                   silc_command_get_ident(cmd->payload),
4999                                   silc_server_command_destructor,
5000                                   silc_server_command_getkey,
5001                                   silc_server_command_dup(cmd));
5002       cmd->pending = TRUE;
5003
5004       silc_command_set_ident(cmd->payload, old_ident);
5005       silc_buffer_free(tmpbuf);
5006       return;
5007     }
5008
5009     if (!server_entry && cmd->pending) {
5010       silc_server_command_send_status_reply(cmd, SILC_COMMAND_GETKEY,
5011                                             SILC_STATUS_ERR_NO_SUCH_SERVER_ID);
5012       goto out;
5013     }
5014
5015     /* The client is locally connected, just get the public key and
5016        send it back. */
5017     tmp = silc_pkcs_public_key_encode(server_entry->data.public_key, &tmp_len);
5018     pk = silc_buffer_alloc(4 + tmp_len);
5019     silc_buffer_pull_tail(pk, SILC_BUFFER_END(pk));
5020     silc_buffer_format(pk,
5021                        SILC_STR_UI_SHORT(tmp_len),
5022                        SILC_STR_UI_SHORT(SILC_SKE_PK_TYPE_SILC),
5023                        SILC_STR_UI_XNSTRING(tmp, tmp_len),
5024                        SILC_STR_END);
5025     silc_free(tmp);
5026   } else {
5027     goto out;
5028   }
5029
5030   tmp = silc_argument_get_arg_type(cmd->args, 1, &tmp_len);
5031   packet = silc_command_reply_payload_encode_va(SILC_COMMAND_GETKEY,
5032                                                 SILC_STATUS_OK, ident, 2,
5033                                                 2, tmp, tmp_len,
5034                                                 3, pk->data, pk->len);
5035   silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0,
5036                           packet->data, packet->len, FALSE);
5037   silc_buffer_free(packet);
5038   silc_buffer_free(pk);
5039
5040  out:
5041   if (idp)
5042     silc_id_payload_free(idp);
5043   silc_free(client_id);
5044   silc_free(server_id);
5045   silc_server_command_free(cmd);
5046 }