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     silc_server_create_channel_key(server, channel, 0);
2901
2902   /* Send the channel key. This is broadcasted to the channel but is not
2903      sent to the client who is joining to the channel. */
2904   if (!(channel->mode & SILC_CHANNEL_MODE_PRIVKEY))
2905     silc_server_send_channel_key(server, NULL, channel,
2906                                  server->server_type == SILC_ROUTER ?
2907                                  FALSE : !server->standalone);
2908
2909   /* Join the client to the channel by adding it to channel's user list.
2910      Add also the channel to client entry's channels list for fast cross-
2911      referencing. */
2912   chl = silc_calloc(1, sizeof(*chl));
2913   chl->mode = umode;
2914   chl->client = client;
2915   chl->channel = channel;
2916   silc_hash_table_add(channel->user_list, client, chl);
2917   silc_hash_table_add(client->channels, channel, chl);
2918
2919   /* Get users on the channel */
2920   silc_server_get_users_on_channel(server, channel, &user_list, &mode_list,
2921                                    &user_count);
2922
2923   /* Encode Client ID Payload of the original client who wants to join */
2924   clidp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
2925
2926   /* Encode command reply packet */
2927   chidp = silc_id_payload_encode(channel->id, SILC_ID_CHANNEL);
2928   SILC_PUT32_MSB(channel->mode, mode);
2929   SILC_PUT32_MSB(created, tmp2);
2930   SILC_PUT32_MSB(user_count, tmp3);
2931
2932   if (!(channel->mode & SILC_CHANNEL_MODE_PRIVKEY)) {
2933     tmp = silc_id_id2str(channel->id, SILC_ID_CHANNEL);
2934     keyp = silc_channel_key_payload_encode(SILC_ID_CHANNEL_LEN, tmp,
2935                                            strlen(channel->channel_key->
2936                                                   cipher->name),
2937                                            channel->channel_key->cipher->name,
2938                                            channel->key_len / 8, channel->key);
2939     silc_free(tmp);
2940   }
2941
2942   reply =
2943     silc_command_reply_payload_encode_va(SILC_COMMAND_JOIN,
2944                                          SILC_STATUS_OK, ident, 13,
2945                                          2, channel->channel_name,
2946                                          strlen(channel->channel_name),
2947                                          3, chidp->data, chidp->len,
2948                                          4, clidp->data, clidp->len,
2949                                          5, mode, 4,
2950                                          6, tmp2, 4,
2951                                          7, keyp ? keyp->data : NULL,
2952                                          keyp ? keyp->len : 0,
2953                                          8, channel->ban_list,
2954                                          channel->ban_list ?
2955                                          strlen(channel->ban_list) : 0,
2956                                          9, channel->invite_list,
2957                                          channel->invite_list ?
2958                                          strlen(channel->invite_list) : 0,
2959                                          10, channel->topic,
2960                                          channel->topic ?
2961                                          strlen(channel->topic) : 0,
2962                                          11, channel->hmac->hmac->name,
2963                                          strlen(channel->hmac->hmac->name),
2964                                          12, tmp3, 4,
2965                                          13, user_list->data, user_list->len,
2966                                          14, mode_list->data,
2967                                          mode_list->len);
2968
2969   /* Send command reply */
2970   silc_server_packet_send(server, sock, SILC_PACKET_COMMAND_REPLY, 0,
2971                           reply->data, reply->len, FALSE);
2972
2973   if (!cmd->pending) {
2974     /* Send JOIN notify to locally connected clients on the channel */
2975     silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
2976                                        SILC_NOTIFY_TYPE_JOIN, 2,
2977                                        clidp->data, clidp->len,
2978                                        chidp->data, chidp->len);
2979
2980     /* Send JOIN notify packet to our primary router */
2981     if (!server->standalone)
2982       silc_server_send_notify_join(server, server->router->connection,
2983                                    server->server_type == SILC_ROUTER ?
2984                                    TRUE : FALSE, channel, client->id);
2985   }
2986
2987   silc_buffer_free(reply);
2988   silc_buffer_free(clidp);
2989   silc_buffer_free(chidp);
2990   silc_buffer_free(keyp);
2991   silc_buffer_free(user_list);
2992   silc_buffer_free(mode_list);
2993
2994  out:
2995   if (passphrase)
2996     silc_free(passphrase);
2997 }
2998
2999 /* Server side of command JOIN. Joins client into requested channel. If
3000    the channel does not exist it will be created. */
3001
3002 SILC_SERVER_CMD_FUNC(join)
3003 {
3004   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
3005   SilcServer server = cmd->server;
3006   uint32 tmp_len;
3007   char *tmp, *channel_name = NULL, *cipher, *hmac;
3008   SilcChannelEntry channel;
3009   uint32 umode = 0;
3010   int created = FALSE;
3011   SilcClientID *client_id;
3012
3013   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_JOIN, cmd, 1, 4);
3014
3015   /* Get channel name */
3016   tmp = silc_argument_get_arg_type(cmd->args, 1, &tmp_len);
3017   if (!tmp) {
3018     silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
3019                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
3020     goto out;
3021   }
3022   channel_name = tmp;
3023
3024   if (strlen(channel_name) > 256)
3025     channel_name[255] = '\0';
3026
3027   if (silc_server_command_bad_chars(channel_name) == TRUE) {
3028     silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
3029                                           SILC_STATUS_ERR_BAD_CHANNEL);
3030     goto out;
3031   }
3032
3033   /* Get Client ID of the client who is joining to the channel */
3034   tmp = silc_argument_get_arg_type(cmd->args, 2, &tmp_len);
3035   if (!tmp) {
3036     silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
3037                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
3038     goto out;
3039   }
3040   client_id = silc_id_payload_parse_id(tmp, tmp_len);
3041   if (!client_id) {
3042     silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
3043                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
3044     goto out;
3045   }
3046
3047   /* Get cipher and hmac name */
3048   cipher = silc_argument_get_arg_type(cmd->args, 4, NULL);
3049   hmac = silc_argument_get_arg_type(cmd->args, 5, NULL);
3050
3051   /* See if the channel exists */
3052   channel = silc_idlist_find_channel_by_name(server->local_list,
3053                                              channel_name, NULL);
3054
3055   if (cmd->sock->type == SILC_SOCKET_TYPE_CLIENT) {
3056     /* If this is coming from client the Client ID in the command packet must
3057        be same as the client's ID. */
3058     if (cmd->sock->type == SILC_SOCKET_TYPE_CLIENT) {
3059       SilcClientEntry entry = (SilcClientEntry)cmd->sock->user_data;
3060       if (!SILC_ID_CLIENT_COMPARE(entry->id, client_id)) {
3061         silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
3062                                         SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
3063         goto out;
3064       }
3065     }
3066
3067     if (!channel || !channel->id) {
3068       /* Channel not found */
3069
3070       /* If we are standalone server we don't have a router, we just create
3071          the channel by ourselves. */
3072       if (server->standalone) {
3073         channel = silc_server_create_new_channel(server, server->id, cipher,
3074                                                  hmac, channel_name, TRUE);
3075         if (!channel) {
3076           silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
3077                                      SILC_STATUS_ERR_UNKNOWN_ALGORITHM);
3078           goto out;
3079         }
3080
3081         umode = (SILC_CHANNEL_UMODE_CHANOP | SILC_CHANNEL_UMODE_CHANFO);
3082         created = TRUE;
3083
3084       } else {
3085
3086         /* The channel does not exist on our server. If we are normal server
3087            we will send JOIN command to our router which will handle the
3088            joining procedure (either creates the channel if it doesn't exist
3089            or joins the client to it). */
3090         if (server->server_type == SILC_SERVER) {
3091           SilcBuffer tmpbuf;
3092           uint16 old_ident;
3093
3094           /* If this is pending command callback then we've resolved
3095              it and it didn't work, return since we've notified the
3096              client already in the command reply callback. */
3097           if (cmd->pending)
3098             goto out;
3099
3100           old_ident = silc_command_get_ident(cmd->payload);
3101           silc_command_set_ident(cmd->payload, silc_rng_get_rn16(server->rng));
3102           tmpbuf = silc_command_payload_encode_payload(cmd->payload);
3103
3104           /* Send JOIN command to our router */
3105           silc_server_packet_send(server, (SilcSocketConnection)
3106                                   server->router->connection,
3107                                   SILC_PACKET_COMMAND, cmd->packet->flags,
3108                                   tmpbuf->data, tmpbuf->len, TRUE);
3109
3110           /* Reprocess this packet after received reply from router */
3111           silc_server_command_pending(server, SILC_COMMAND_JOIN,
3112                                       silc_command_get_ident(cmd->payload),
3113                                       silc_server_command_destructor,
3114                                       silc_server_command_join,
3115                                       silc_server_command_dup(cmd));
3116           cmd->pending = TRUE;
3117           return;
3118         }
3119
3120         /* We are router and the channel does not seem exist so we will check
3121            our global list as well for the channel. */
3122         channel = silc_idlist_find_channel_by_name(server->global_list,
3123                                                    channel_name, NULL);
3124         if (!channel) {
3125           /* Channel really does not exist, create it */
3126           channel = silc_server_create_new_channel(server, server->id, cipher,
3127                                                    hmac, channel_name, TRUE);
3128           if (!channel) {
3129             silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
3130                                        SILC_STATUS_ERR_UNKNOWN_ALGORITHM);
3131             goto out;
3132           }
3133
3134           umode = (SILC_CHANNEL_UMODE_CHANOP | SILC_CHANNEL_UMODE_CHANFO);
3135           created = TRUE;
3136         }
3137       }
3138     }
3139   } else {
3140     if (!channel) {
3141       /* Channel not found */
3142
3143       /* If the command came from router and/or we are normal server then
3144          something went wrong with the joining as the channel was not found.
3145          We can't do anything else but ignore this. */
3146       if (cmd->sock->type == SILC_SOCKET_TYPE_ROUTER ||
3147           server->server_type == SILC_SERVER)
3148         goto out;
3149
3150       /* We are router and the channel does not seem exist so we will check
3151          our global list as well for the channel. */
3152       channel = silc_idlist_find_channel_by_name(server->global_list,
3153                                                  channel_name, NULL);
3154       if (!channel) {
3155         /* Channel really does not exist, create it */
3156         channel = silc_server_create_new_channel(server, server->id, cipher,
3157                                                  hmac, channel_name, TRUE);
3158         if (!channel) {
3159           silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
3160                                        SILC_STATUS_ERR_UNKNOWN_ALGORITHM);
3161           goto out;
3162         }
3163
3164         umode = (SILC_CHANNEL_UMODE_CHANOP | SILC_CHANNEL_UMODE_CHANFO);
3165         created = TRUE;
3166       }
3167     }
3168   }
3169
3170   /* If the channel does not have global users and is also empty it means the
3171      channel was created globally (by our router) and the client will be the
3172      channel founder and operator. */
3173   if (!channel->global_users && !silc_hash_table_count(channel->user_list)) {
3174     umode = (SILC_CHANNEL_UMODE_CHANOP | SILC_CHANNEL_UMODE_CHANFO);
3175     created = TRUE;             /* Created globally by our router */
3176   }
3177
3178   /* Join to the channel */
3179   silc_server_command_join_channel(server, cmd, channel, client_id,
3180                                    created, umode);
3181
3182   silc_free(client_id);
3183
3184  out:
3185   silc_server_command_free(cmd);
3186 }
3187
3188 /* Server side of command MOTD. Sends server's current "message of the
3189    day" to the client. */
3190
3191 SILC_SERVER_CMD_FUNC(motd)
3192 {
3193   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
3194   SilcServer server = cmd->server;
3195   SilcBuffer packet, idp;
3196   char *motd, *dest_server;
3197   uint32 motd_len;
3198   uint16 ident = silc_command_get_ident(cmd->payload);
3199
3200   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_MOTD, cmd, 1, 1);
3201
3202   /* Get server name */
3203   dest_server = silc_argument_get_arg_type(cmd->args, 1, NULL);
3204   if (!dest_server) {
3205     silc_server_command_send_status_reply(cmd, SILC_COMMAND_MOTD,
3206                                           SILC_STATUS_ERR_NO_SUCH_SERVER);
3207     goto out;
3208   }
3209
3210   if (!strncasecmp(dest_server, server->server_name, strlen(dest_server))) {
3211     /* Send our MOTD */
3212
3213     idp = silc_id_payload_encode(server->id_entry->id, SILC_ID_SERVER);
3214
3215     if (server->config && server->config->motd &&
3216         server->config->motd->motd_file) {
3217       /* Send motd */
3218       motd = silc_file_read(server->config->motd->motd_file, &motd_len);
3219       if (!motd)
3220         goto out;
3221
3222       motd[motd_len] = 0;
3223       packet = silc_command_reply_payload_encode_va(SILC_COMMAND_MOTD,
3224                                                     SILC_STATUS_OK, ident, 2,
3225                                                     2, idp, idp->len,
3226                                                     3, motd, motd_len);
3227       goto out;
3228     } else {
3229       /* No motd */
3230       packet = silc_command_reply_payload_encode_va(SILC_COMMAND_MOTD,
3231                                                     SILC_STATUS_OK, ident, 1,
3232                                                     2, idp, idp->len);
3233     }
3234
3235     silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0,
3236                             packet->data, packet->len, FALSE);
3237     silc_buffer_free(packet);
3238     silc_buffer_free(idp);
3239   } else {
3240     SilcServerEntry entry;
3241
3242     /* Check whether we have this server cached */
3243     entry = silc_idlist_find_server_by_name(server->global_list,
3244                                             dest_server, NULL);
3245     if (!entry) {
3246       entry = silc_idlist_find_server_by_name(server->local_list,
3247                                               dest_server, NULL);
3248     }
3249
3250     if (server->server_type == SILC_ROUTER && !cmd->pending &&
3251         entry && !entry->motd) {
3252       /* Send to the server */
3253       SilcBuffer tmpbuf;
3254       uint16 old_ident;
3255
3256       old_ident = silc_command_get_ident(cmd->payload);
3257       silc_command_set_ident(cmd->payload, silc_rng_get_rn16(server->rng));
3258       tmpbuf = silc_command_payload_encode_payload(cmd->payload);
3259
3260       silc_server_packet_send(server, entry->connection,
3261                               SILC_PACKET_COMMAND, cmd->packet->flags,
3262                               tmpbuf->data, tmpbuf->len, TRUE);
3263
3264       /* Reprocess this packet after received reply from router */
3265       silc_server_command_pending(server, SILC_COMMAND_MOTD,
3266                                   silc_command_get_ident(cmd->payload),
3267                                   silc_server_command_destructor,
3268                                   silc_server_command_motd,
3269                                   silc_server_command_dup(cmd));
3270       cmd->pending = TRUE;
3271       silc_command_set_ident(cmd->payload, old_ident);
3272       silc_buffer_free(tmpbuf);
3273       return;
3274     }
3275
3276     if (!entry && !cmd->pending && !server->standalone) {
3277       /* Send to the primary router */
3278       SilcBuffer tmpbuf;
3279       uint16 old_ident;
3280
3281       old_ident = silc_command_get_ident(cmd->payload);
3282       silc_command_set_ident(cmd->payload, silc_rng_get_rn16(server->rng));
3283       tmpbuf = silc_command_payload_encode_payload(cmd->payload);
3284
3285       silc_server_packet_send(server, server->router->connection,
3286                               SILC_PACKET_COMMAND, cmd->packet->flags,
3287                               tmpbuf->data, tmpbuf->len, TRUE);
3288
3289       /* Reprocess this packet after received reply from router */
3290       silc_server_command_pending(server, SILC_COMMAND_MOTD,
3291                                   silc_command_get_ident(cmd->payload),
3292                                   silc_server_command_destructor,
3293                                   silc_server_command_motd,
3294                                   silc_server_command_dup(cmd));
3295       cmd->pending = TRUE;
3296       silc_command_set_ident(cmd->payload, old_ident);
3297       silc_buffer_free(tmpbuf);
3298       return;
3299     }
3300
3301     if (!entry) {
3302       silc_server_command_send_status_reply(cmd, SILC_COMMAND_INFO,
3303                                             SILC_STATUS_ERR_NO_SUCH_SERVER);
3304       goto out;
3305     }
3306
3307     idp = silc_id_payload_encode(server->id_entry->id, SILC_ID_SERVER);
3308
3309     if (entry->motd)
3310       packet = silc_command_reply_payload_encode_va(SILC_COMMAND_MOTD,
3311                                                     SILC_STATUS_OK, ident, 2,
3312                                                     2, idp, idp->len,
3313                                                     3, entry->motd,
3314                                                     strlen(entry->motd));
3315     else
3316       packet = silc_command_reply_payload_encode_va(SILC_COMMAND_MOTD,
3317                                                     SILC_STATUS_OK, ident, 1,
3318                                                     2, idp, idp->len);
3319
3320     silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0,
3321                             packet->data, packet->len, FALSE);
3322     silc_buffer_free(packet);
3323     silc_buffer_free(idp);
3324   }
3325
3326  out:
3327   silc_server_command_free(cmd);
3328 }
3329
3330 /* Server side of command UMODE. Client can use this command to set/unset
3331    user mode. Client actually cannot set itself to be as server/router
3332    operator so this can be used only to unset the modes. */
3333
3334 SILC_SERVER_CMD_FUNC(umode)
3335 {
3336   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
3337   SilcServer server = cmd->server;
3338   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
3339   SilcBuffer packet;
3340   unsigned char *tmp_mask;
3341   uint32 mask;
3342   uint16 ident = silc_command_get_ident(cmd->payload);
3343
3344   if (cmd->sock->type != SILC_SOCKET_TYPE_CLIENT)
3345     goto out;
3346
3347   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_UMODE, cmd, 2, 2);
3348
3349   /* Get the client's mode mask */
3350   tmp_mask = silc_argument_get_arg_type(cmd->args, 2, NULL);
3351   if (!tmp_mask) {
3352     silc_server_command_send_status_reply(cmd, SILC_COMMAND_UMODE,
3353                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
3354     goto out;
3355   }
3356   SILC_GET32_MSB(mask, tmp_mask);
3357
3358   /*
3359    * Change the mode
3360    */
3361
3362   if (mask & SILC_UMODE_SERVER_OPERATOR) {
3363     if (!(client->mode & SILC_UMODE_SERVER_OPERATOR)) {
3364       /* Cannot operator mode */
3365       silc_server_command_send_status_reply(cmd, SILC_COMMAND_UMODE,
3366                                             SILC_STATUS_ERR_PERM_DENIED);
3367       goto out;
3368     }
3369   } else {
3370     if (client->mode & SILC_UMODE_SERVER_OPERATOR)
3371       /* Remove the server operator rights */
3372       client->mode &= ~SILC_UMODE_SERVER_OPERATOR;
3373   }
3374
3375   if (mask & SILC_UMODE_ROUTER_OPERATOR) {
3376     if (!(client->mode & SILC_UMODE_ROUTER_OPERATOR)) {
3377       /* Cannot operator mode */
3378       silc_server_command_send_status_reply(cmd, SILC_COMMAND_UMODE,
3379                                             SILC_STATUS_ERR_PERM_DENIED);
3380       goto out;
3381     }
3382   } else {
3383     if (client->mode & SILC_UMODE_ROUTER_OPERATOR)
3384       /* Remove the router operator rights */
3385       client->mode &= ~SILC_UMODE_ROUTER_OPERATOR;
3386   }
3387
3388   if (mask & SILC_UMODE_GONE) {
3389     client->mode |= SILC_UMODE_GONE;
3390   } else {
3391     if (client->mode & SILC_UMODE_GONE)
3392       /* Remove the gone status */
3393       client->mode &= ~SILC_UMODE_GONE;
3394   }
3395
3396   /* Send UMODE change to primary router */
3397   if (!server->standalone)
3398     silc_server_send_notify_umode(server, server->router->connection, TRUE,
3399                                   client->id, client->mode);
3400
3401   /* Send command reply to sender */
3402   packet = silc_command_reply_payload_encode_va(SILC_COMMAND_UMODE,
3403                                                 SILC_STATUS_OK, ident, 1,
3404                                                 2, tmp_mask, 4);
3405   silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0,
3406                           packet->data, packet->len, FALSE);
3407   silc_buffer_free(packet);
3408
3409  out:
3410   silc_server_command_free(cmd);
3411 }
3412
3413 /* Checks that client has rights to add or remove channel modes. If any
3414    of the checks fails FALSE is returned. */
3415
3416 int silc_server_check_cmode_rights(SilcChannelEntry channel,
3417                                    SilcChannelClientEntry client,
3418                                    uint32 mode)
3419 {
3420   int is_op = client->mode & SILC_CHANNEL_UMODE_CHANOP;
3421   int is_fo = client->mode & SILC_CHANNEL_UMODE_CHANFO;
3422
3423   /* Check whether has rights to change anything */
3424   if (!is_op && !is_fo)
3425     return FALSE;
3426
3427   /* Check whether has rights to change everything */
3428   if (is_op && is_fo)
3429     return TRUE;
3430
3431   /* We know that client is channel operator, check that they are not
3432      changing anything that requires channel founder rights. Rest of the
3433      modes are available automatically for channel operator. */
3434
3435   if (mode & SILC_CHANNEL_MODE_PRIVKEY) {
3436     if (is_op && !is_fo)
3437       return FALSE;
3438   } else {
3439     if (channel->mode & SILC_CHANNEL_MODE_PRIVKEY) {
3440       if (is_op && !is_fo)
3441         return FALSE;
3442     }
3443   }
3444
3445   if (mode & SILC_CHANNEL_MODE_PASSPHRASE) {
3446     if (is_op && !is_fo)
3447       return FALSE;
3448   } else {
3449     if (channel->mode & SILC_CHANNEL_MODE_PASSPHRASE) {
3450       if (is_op && !is_fo)
3451         return FALSE;
3452     }
3453   }
3454
3455   if (mode & SILC_CHANNEL_MODE_CIPHER) {
3456     if (is_op && !is_fo)
3457       return FALSE;
3458   } else {
3459     if (channel->mode & SILC_CHANNEL_MODE_CIPHER) {
3460       if (is_op && !is_fo)
3461         return FALSE;
3462     }
3463   }
3464
3465   if (mode & SILC_CHANNEL_MODE_FOUNDER_AUTH) {
3466     if (is_op && !is_fo)
3467       return FALSE;
3468   } else {
3469     if (channel->mode & SILC_CHANNEL_MODE_FOUNDER_AUTH) {
3470       if (is_op && !is_fo)
3471         return FALSE;
3472     }
3473   }
3474
3475   return TRUE;
3476 }
3477
3478 /* Server side command of CMODE. Changes channel mode */
3479
3480 SILC_SERVER_CMD_FUNC(cmode)
3481 {
3482   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
3483   SilcServer server = cmd->server;
3484   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
3485   SilcIDListData idata = (SilcIDListData)client;
3486   SilcChannelID *channel_id;
3487   SilcChannelEntry channel;
3488   SilcChannelClientEntry chl;
3489   SilcBuffer packet, cidp;
3490   unsigned char *tmp, *tmp_id, *tmp_mask;
3491   char *cipher = NULL, *hmac = NULL;
3492   uint32 mode_mask, tmp_len, tmp_len2;
3493   uint16 ident = silc_command_get_ident(cmd->payload);
3494
3495   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_CMODE, cmd, 2, 7);
3496
3497   /* Get Channel ID */
3498   tmp_id = silc_argument_get_arg_type(cmd->args, 1, &tmp_len2);
3499   if (!tmp_id) {
3500     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3501                                           SILC_STATUS_ERR_NO_CHANNEL_ID);
3502     goto out;
3503   }
3504   channel_id = silc_id_payload_parse_id(tmp_id, tmp_len2);
3505   if (!channel_id) {
3506     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3507                                           SILC_STATUS_ERR_NO_CHANNEL_ID);
3508     goto out;
3509   }
3510
3511   /* Get the channel mode mask */
3512   tmp_mask = silc_argument_get_arg_type(cmd->args, 2, &tmp_len);
3513   if (!tmp_mask) {
3514     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3515                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
3516     goto out;
3517   }
3518   SILC_GET32_MSB(mode_mask, tmp_mask);
3519
3520   /* Get channel entry */
3521   channel = silc_idlist_find_channel_by_id(server->local_list,
3522                                            channel_id, NULL);
3523   if (!channel) {
3524     channel = silc_idlist_find_channel_by_id(server->global_list,
3525                                              channel_id, NULL);
3526     if (!channel) {
3527       silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3528                                             SILC_STATUS_ERR_NO_SUCH_CHANNEL);
3529       goto out;
3530     }
3531   }
3532
3533   /* Check whether this client is on the channel */
3534   if (!silc_server_client_on_channel(client, channel)) {
3535     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3536                                           SILC_STATUS_ERR_NOT_ON_CHANNEL);
3537     goto out;
3538   }
3539
3540   /* Get entry to the channel user list */
3541   silc_hash_table_find(channel->user_list, client, NULL, (void *)&chl);
3542
3543   /* Check that client has rights to change any requested channel modes */
3544   if (!silc_server_check_cmode_rights(channel, chl, mode_mask)) {
3545     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3546                                           SILC_STATUS_ERR_NO_CHANNEL_PRIV);
3547     goto out;
3548   }
3549
3550   /*
3551    * Check the modes. Modes that requires nothing special operation are
3552    * not checked here.
3553    */
3554
3555   if (mode_mask & SILC_CHANNEL_MODE_PRIVKEY) {
3556     /* Channel uses private keys to protect traffic. Client(s) has set the
3557        key locally they want to use, server does not know that key. */
3558     /* Nothing interesting to do here */
3559   } else {
3560     if (channel->mode & SILC_CHANNEL_MODE_PRIVKEY) {
3561       /* The mode is removed and we need to generate and distribute
3562          new channel key. Clients are not using private channel keys
3563          anymore after this. */
3564
3565       /* Re-generate channel key */
3566       silc_server_create_channel_key(server, channel, 0);
3567
3568       /* Send the channel key. This sends it to our local clients and if
3569          we are normal server to our router as well. */
3570       silc_server_send_channel_key(server, NULL, channel,
3571                                    server->server_type == SILC_ROUTER ?
3572                                    FALSE : !server->standalone);
3573
3574       cipher = channel->channel_key->cipher->name;
3575       hmac = channel->hmac->hmac->name;
3576     }
3577   }
3578
3579   if (mode_mask & SILC_CHANNEL_MODE_ULIMIT) {
3580     /* User limit is set on channel */
3581     uint32 user_limit;
3582
3583     /* Get user limit */
3584     tmp = silc_argument_get_arg_type(cmd->args, 3, NULL);
3585     if (!tmp) {
3586       if (!(channel->mode & SILC_CHANNEL_MODE_ULIMIT)) {
3587         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3588                                    SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
3589         goto out;
3590       }
3591     } else {
3592       SILC_GET32_MSB(user_limit, tmp);
3593       channel->user_limit = user_limit;
3594     }
3595   } else {
3596     if (channel->mode & SILC_CHANNEL_MODE_ULIMIT)
3597       /* User limit mode is unset. Remove user limit */
3598       channel->user_limit = 0;
3599   }
3600
3601   if (mode_mask & SILC_CHANNEL_MODE_PASSPHRASE) {
3602     if (!(channel->mode & SILC_CHANNEL_MODE_PASSPHRASE)) {
3603       /* Passphrase has been set to channel */
3604
3605       /* Get the passphrase */
3606       tmp = silc_argument_get_arg_type(cmd->args, 4, NULL);
3607       if (!tmp) {
3608         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3609                                    SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
3610         goto out;
3611       }
3612
3613       /* Save the passphrase */
3614       channel->passphrase = strdup(tmp);
3615     }
3616   } else {
3617     if (channel->mode & SILC_CHANNEL_MODE_PASSPHRASE) {
3618       /* Passphrase mode is unset. remove the passphrase */
3619       if (channel->passphrase) {
3620         silc_free(channel->passphrase);
3621         channel->passphrase = NULL;
3622       }
3623     }
3624   }
3625
3626   if (mode_mask & SILC_CHANNEL_MODE_CIPHER) {
3627     if (!(channel->mode & SILC_CHANNEL_MODE_CIPHER)) {
3628       /* Cipher to use protect the traffic */
3629
3630       /* Get cipher */
3631       cipher = silc_argument_get_arg_type(cmd->args, 5, NULL);
3632       if (!cipher) {
3633         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3634                                    SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
3635         goto out;
3636       }
3637
3638       /* Delete old cipher and allocate the new one */
3639       silc_cipher_free(channel->channel_key);
3640       if (!silc_cipher_alloc(cipher, &channel->channel_key)) {
3641         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3642                                        SILC_STATUS_ERR_UNKNOWN_ALGORITHM);
3643         goto out;
3644       }
3645
3646       /* Re-generate channel key */
3647       silc_server_create_channel_key(server, channel, 0);
3648
3649       /* Send the channel key. This sends it to our local clients and if
3650          we are normal server to our router as well. */
3651       silc_server_send_channel_key(server, NULL, channel,
3652                                    server->server_type == SILC_ROUTER ?
3653                                    FALSE : !server->standalone);
3654     }
3655   } else {
3656     if (channel->mode & SILC_CHANNEL_MODE_CIPHER) {
3657       /* Cipher mode is unset. Remove the cipher and revert back to
3658          default cipher */
3659       cipher = channel->cipher;
3660
3661       /* Delete old cipher and allocate default one */
3662       silc_cipher_free(channel->channel_key);
3663       if (!silc_cipher_alloc(cipher ? cipher : "aes-256-cbc",
3664                              &channel->channel_key)) {
3665         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3666                                    SILC_STATUS_ERR_UNKNOWN_ALGORITHM);
3667         goto out;
3668       }
3669
3670       /* Re-generate channel key */
3671       silc_server_create_channel_key(server, channel, 0);
3672
3673       /* Send the channel key. This sends it to our local clients and if
3674          we are normal server to our router as well. */
3675       silc_server_send_channel_key(server, NULL, channel,
3676                                    server->server_type == SILC_ROUTER ?
3677                                    FALSE : !server->standalone);
3678     }
3679   }
3680
3681   if (mode_mask & SILC_CHANNEL_MODE_HMAC) {
3682     if (!(channel->mode & SILC_CHANNEL_MODE_HMAC)) {
3683       /* HMAC to use protect the traffic */
3684       unsigned char hash[32];
3685
3686       /* Get hmac */
3687       hmac = silc_argument_get_arg_type(cmd->args, 6, NULL);
3688       if (!hmac) {
3689         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3690                                    SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
3691         goto out;
3692       }
3693
3694       /* Delete old hmac and allocate the new one */
3695       silc_hmac_free(channel->hmac);
3696       if (!silc_hmac_alloc(hmac, NULL, &channel->hmac)) {
3697         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3698                                        SILC_STATUS_ERR_UNKNOWN_ALGORITHM);
3699         goto out;
3700       }
3701
3702       /* Set the HMAC key out of current channel key. The client must do
3703          this locally. */
3704       silc_hash_make(channel->hmac->hash, channel->key, channel->key_len / 8,
3705                      hash);
3706       silc_hmac_set_key(channel->hmac, hash,
3707                         silc_hash_len(channel->hmac->hash));
3708       memset(hash, 0, sizeof(hash));
3709     }
3710   } else {
3711     if (channel->mode & SILC_CHANNEL_MODE_HMAC) {
3712       /* Hmac mode is unset. Remove the hmac and revert back to
3713          default hmac */
3714       unsigned char hash[32];
3715       hmac = channel->hmac_name;
3716
3717       /* Delete old hmac and allocate default one */
3718       silc_hmac_free(channel->hmac);
3719       if (!silc_hmac_alloc(hmac ? hmac : "hmac-sha1-96", NULL,
3720                            &channel->hmac)) {
3721         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3722                                        SILC_STATUS_ERR_UNKNOWN_ALGORITHM);
3723         goto out;
3724       }
3725
3726       /* Set the HMAC key out of current channel key. The client must do
3727          this locally. */
3728       silc_hash_make(channel->hmac->hash, channel->key, channel->key_len / 8,
3729                      hash);
3730       silc_hmac_set_key(channel->hmac, hash,
3731                         silc_hash_len(channel->hmac->hash));
3732       memset(hash, 0, sizeof(hash));
3733     }
3734   }
3735
3736   if (mode_mask & SILC_CHANNEL_MODE_FOUNDER_AUTH) {
3737     if (chl->mode & SILC_CHANNEL_UMODE_CHANFO) {
3738       if (!(channel->mode & SILC_CHANNEL_MODE_FOUNDER_AUTH)) {
3739         /* Set the founder authentication */
3740         SilcAuthPayload auth;
3741
3742         tmp = silc_argument_get_arg_type(cmd->args, 7, &tmp_len);
3743         if (!tmp) {
3744           silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3745                                      SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
3746           goto out;
3747         }
3748
3749         auth = silc_auth_payload_parse(tmp, tmp_len);
3750         if (!auth) {
3751           silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3752                                      SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
3753           goto out;
3754         }
3755
3756         /* Save the public key */
3757         tmp = silc_pkcs_public_key_encode(idata->public_key, &tmp_len);
3758         silc_pkcs_public_key_decode(tmp, tmp_len, &channel->founder_key);
3759         silc_free(tmp);
3760
3761         channel->founder_method = silc_auth_get_method(auth);
3762
3763         if (channel->founder_method == SILC_AUTH_PASSWORD) {
3764           tmp = silc_auth_get_data(auth, &tmp_len);
3765           channel->founder_passwd =
3766             silc_calloc(tmp_len + 1, sizeof(*channel->founder_passwd));
3767           memcpy(channel->founder_passwd, tmp, tmp_len);
3768           channel->founder_passwd_len = tmp_len;
3769         } else {
3770           /* Verify the payload before setting the mode */
3771           if (!silc_auth_verify(auth, channel->founder_method,
3772                                 channel->founder_key, 0, idata->hash,
3773                                 client->id, SILC_ID_CLIENT)) {
3774             silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3775                                                   SILC_STATUS_ERR_AUTH_FAILED);
3776             goto out;
3777           }
3778         }
3779
3780         silc_auth_payload_free(auth);
3781       }
3782     }
3783   } else {
3784     if (chl->mode & SILC_CHANNEL_UMODE_CHANFO) {
3785       if (channel->mode & SILC_CHANNEL_MODE_FOUNDER_AUTH) {
3786         if (channel->founder_key)
3787           silc_pkcs_public_key_free(channel->founder_key);
3788         if (channel->founder_passwd) {
3789           silc_free(channel->founder_passwd);
3790           channel->founder_passwd = NULL;
3791         }
3792       }
3793     }
3794   }
3795
3796   /* Finally, set the mode */
3797   channel->mode = mode_mask;
3798
3799   /* Send CMODE_CHANGE notify */
3800   cidp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
3801   silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
3802                                      SILC_NOTIFY_TYPE_CMODE_CHANGE, 4,
3803                                      cidp->data, cidp->len,
3804                                      tmp_mask, 4,
3805                                      cipher, cipher ? strlen(cipher) : 0,
3806                                      hmac, hmac ? strlen(hmac) : 0);
3807
3808   /* Set CMODE notify type to network */
3809   if (!server->standalone)
3810     silc_server_send_notify_cmode(server, server->router->connection,
3811                                   server->server_type == SILC_ROUTER ?
3812                                   TRUE : FALSE, channel,
3813                                   mode_mask, client->id, SILC_ID_CLIENT,
3814                                   cipher, hmac);
3815
3816   /* Send command reply to sender */
3817   packet = silc_command_reply_payload_encode_va(SILC_COMMAND_CMODE,
3818                                                 SILC_STATUS_OK, ident, 2,
3819                                                 2, tmp_id, tmp_len2,
3820                                                 3, tmp_mask, 4);
3821   silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0,
3822                           packet->data, packet->len, FALSE);
3823
3824   silc_buffer_free(packet);
3825   silc_free(channel_id);
3826   silc_free(cidp);
3827
3828  out:
3829   silc_server_command_free(cmd);
3830 }
3831
3832 /* Server side of CUMODE command. Changes client's mode on a channel. */
3833
3834 SILC_SERVER_CMD_FUNC(cumode)
3835 {
3836   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
3837   SilcServer server = cmd->server;
3838   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
3839   SilcIDListData idata = (SilcIDListData)client;
3840   SilcChannelID *channel_id;
3841   SilcClientID *client_id;
3842   SilcChannelEntry channel;
3843   SilcClientEntry target_client;
3844   SilcChannelClientEntry chl;
3845   SilcBuffer packet, idp;
3846   unsigned char *tmp_id, *tmp_ch_id, *tmp_mask;
3847   uint32 target_mask, sender_mask = 0, tmp_len, tmp_ch_len;
3848   int notify = FALSE;
3849   uint16 ident = silc_command_get_ident(cmd->payload);
3850
3851   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_CUMODE, cmd, 3, 4);
3852
3853   /* Get Channel ID */
3854   tmp_ch_id = silc_argument_get_arg_type(cmd->args, 1, &tmp_ch_len);
3855   if (!tmp_ch_id) {
3856     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3857                                           SILC_STATUS_ERR_NO_CHANNEL_ID);
3858     goto out;
3859   }
3860   channel_id = silc_id_payload_parse_id(tmp_ch_id, tmp_ch_len);
3861   if (!channel_id) {
3862     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3863                                           SILC_STATUS_ERR_NO_CHANNEL_ID);
3864     goto out;
3865   }
3866
3867   /* Get channel entry */
3868   channel = silc_idlist_find_channel_by_id(server->local_list,
3869                                            channel_id, NULL);
3870   if (!channel) {
3871     channel = silc_idlist_find_channel_by_id(server->global_list,
3872                                              channel_id, NULL);
3873     if (!channel) {
3874       silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3875                                             SILC_STATUS_ERR_NO_SUCH_CHANNEL);
3876       goto out;
3877     }
3878   }
3879
3880   /* Check whether sender is on the channel */
3881   if (!silc_server_client_on_channel(client, channel)) {
3882     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3883                                           SILC_STATUS_ERR_NOT_ON_CHANNEL);
3884     goto out;
3885   }
3886
3887   /* Check that client has rights to change other's rights */
3888   silc_hash_table_find(channel->user_list, client, NULL, (void *)&chl);
3889   sender_mask = chl->mode;
3890
3891   /* Get the target client's channel mode mask */
3892   tmp_mask = silc_argument_get_arg_type(cmd->args, 2, NULL);
3893   if (!tmp_mask) {
3894     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3895                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
3896     goto out;
3897   }
3898   SILC_GET32_MSB(target_mask, tmp_mask);
3899
3900   /* Get target Client ID */
3901   tmp_id = silc_argument_get_arg_type(cmd->args, 3, &tmp_len);
3902   if (!tmp_id) {
3903     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3904                                           SILC_STATUS_ERR_NO_CLIENT_ID);
3905     goto out;
3906   }
3907   client_id = silc_id_payload_parse_id(tmp_id, tmp_len);
3908   if (!client_id) {
3909     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3910                                           SILC_STATUS_ERR_NO_CLIENT_ID);
3911     goto out;
3912   }
3913
3914   /* Get target client's entry */
3915   target_client = silc_idlist_find_client_by_id(server->local_list,
3916                                                 client_id, NULL);
3917   if (!target_client) {
3918     target_client = silc_idlist_find_client_by_id(server->global_list,
3919                                                   client_id, NULL);
3920   }
3921
3922   if (target_client != client &&
3923       !(sender_mask & SILC_CHANNEL_UMODE_CHANFO) &&
3924       !(sender_mask & SILC_CHANNEL_UMODE_CHANOP)) {
3925     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3926                                           SILC_STATUS_ERR_NO_CHANNEL_PRIV);
3927     goto out;
3928   }
3929
3930   /* Check whether target client is on the channel */
3931   if (target_client != client) {
3932     if (!silc_server_client_on_channel(target_client, channel)) {
3933       silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3934                                  SILC_STATUS_ERR_USER_NOT_ON_CHANNEL);
3935       goto out;
3936     }
3937
3938     /* Get entry to the channel user list */
3939     silc_hash_table_find(channel->user_list, target_client, NULL,
3940                          (void *)&chl);
3941   }
3942
3943   /*
3944    * Change the mode
3945    */
3946
3947   /* If the target client is founder, no one else can change their mode
3948      but themselves. */
3949   if (chl->mode & SILC_CHANNEL_UMODE_CHANFO && chl->client != target_client) {
3950     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3951                                           SILC_STATUS_ERR_NOT_YOU);
3952     goto out;
3953   }
3954
3955   if (target_mask & SILC_CHANNEL_UMODE_CHANFO) {
3956     /* The client tries to claim the founder rights. */
3957     unsigned char *tmp_auth;
3958     uint32 tmp_auth_len, auth_len;
3959     void *auth;
3960
3961     if (target_client != client) {
3962       silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3963                                             SILC_STATUS_ERR_NOT_YOU);
3964       goto out;
3965     }
3966
3967     if (!(channel->mode & SILC_CHANNEL_MODE_FOUNDER_AUTH) ||
3968         !channel->founder_key) {
3969       silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3970                                             SILC_STATUS_ERR_NOT_YOU);
3971       goto out;
3972     }
3973
3974     tmp_auth = silc_argument_get_arg_type(cmd->args, 4, &tmp_auth_len);
3975     if (!tmp_auth) {
3976       silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3977                                             SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
3978       goto out;
3979     }
3980
3981     auth = (channel->founder_method == SILC_AUTH_PASSWORD ?
3982             (void *)channel->founder_passwd : (void *)channel->founder_key);
3983     auth_len = (channel->founder_method == SILC_AUTH_PASSWORD ?
3984                 channel->founder_passwd_len : 0);
3985
3986     if (!silc_auth_verify_data(tmp_auth, tmp_auth_len,
3987                                channel->founder_method, auth, auth_len,
3988                                idata->hash, client->id, SILC_ID_CLIENT)) {
3989       silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3990                                             SILC_STATUS_ERR_AUTH_FAILED);
3991       goto out;
3992     }
3993
3994     sender_mask = chl->mode |= SILC_CHANNEL_UMODE_CHANFO;
3995     notify = TRUE;
3996   } else {
3997     if (chl->mode & SILC_CHANNEL_UMODE_CHANFO) {
3998       if (target_client == client) {
3999         /* Remove channel founder rights from itself */
4000         chl->mode &= ~SILC_CHANNEL_UMODE_CHANFO;
4001         notify = TRUE;
4002       } else {
4003         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
4004                                               SILC_STATUS_ERR_NOT_YOU);
4005         goto out;
4006       }
4007     }
4008   }
4009
4010   if (target_mask & SILC_CHANNEL_UMODE_CHANOP) {
4011     /* Promote to operator */
4012     if (!(chl->mode & SILC_CHANNEL_UMODE_CHANOP)) {
4013       if (!(sender_mask & SILC_CHANNEL_UMODE_CHANOP) &&
4014           !(sender_mask & SILC_CHANNEL_UMODE_CHANFO)) {
4015         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
4016                                               SILC_STATUS_ERR_NO_CHANNEL_PRIV);
4017         goto out;
4018       }
4019
4020       chl->mode |= SILC_CHANNEL_UMODE_CHANOP;
4021       notify = TRUE;
4022     }
4023   } else {
4024     if (chl->mode & SILC_CHANNEL_UMODE_CHANOP) {
4025       if (!(sender_mask & SILC_CHANNEL_UMODE_CHANOP) &&
4026           !(sender_mask & SILC_CHANNEL_UMODE_CHANFO)) {
4027         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
4028                                               SILC_STATUS_ERR_NO_CHANNEL_PRIV);
4029         goto out;
4030       }
4031
4032       /* Demote to normal user */
4033       chl->mode &= ~SILC_CHANNEL_UMODE_CHANOP;
4034       notify = TRUE;
4035     }
4036   }
4037
4038   idp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
4039   tmp_id = silc_argument_get_arg_type(cmd->args, 3, &tmp_len);
4040
4041   /* Send notify to channel, notify only if mode was actually changed. */
4042   if (notify) {
4043     silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
4044                                        SILC_NOTIFY_TYPE_CUMODE_CHANGE, 3,
4045                                        idp->data, idp->len,
4046                                        tmp_mask, 4,
4047                                        tmp_id, tmp_len);
4048
4049     /* Set CUMODE notify type to network */
4050     if (!server->standalone)
4051       silc_server_send_notify_cumode(server, server->router->connection,
4052                                      server->server_type == SILC_ROUTER ?
4053                                      TRUE : FALSE, channel,
4054                                      target_mask, client->id,
4055                                      SILC_ID_CLIENT,
4056                                      target_client->id);
4057   }
4058
4059   /* Send command reply to sender */
4060   packet = silc_command_reply_payload_encode_va(SILC_COMMAND_CUMODE,
4061                                                 SILC_STATUS_OK, ident, 3,
4062                                                 2, tmp_mask, 4,
4063                                                 3, tmp_ch_id, tmp_ch_len,
4064                                                 4, tmp_id, tmp_len);
4065   silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0,
4066                           packet->data, packet->len, FALSE);
4067
4068   silc_buffer_free(packet);
4069   silc_free(channel_id);
4070   silc_free(client_id);
4071   silc_buffer_free(idp);
4072
4073  out:
4074   silc_server_command_free(cmd);
4075 }
4076
4077 /* Server side of KICK command. Kicks client out of channel. */
4078
4079 SILC_SERVER_CMD_FUNC(kick)
4080 {
4081   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
4082   SilcServer server = cmd->server;
4083   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
4084   SilcClientEntry target_client;
4085   SilcChannelID *channel_id;
4086   SilcClientID *client_id;
4087   SilcChannelEntry channel;
4088   SilcChannelClientEntry chl;
4089   SilcBuffer idp;
4090   uint32 tmp_len;
4091   unsigned char *tmp, *comment;
4092
4093   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_LEAVE, cmd, 1, 3);
4094
4095   /* Get Channel ID */
4096   tmp = silc_argument_get_arg_type(cmd->args, 1, &tmp_len);
4097   if (!tmp) {
4098     silc_server_command_send_status_reply(cmd, SILC_COMMAND_KICK,
4099                                           SILC_STATUS_ERR_NO_CHANNEL_ID);
4100     goto out;
4101   }
4102   channel_id = silc_id_payload_parse_id(tmp, tmp_len);
4103   if (!channel_id) {
4104     silc_server_command_send_status_reply(cmd, SILC_COMMAND_KICK,
4105                                           SILC_STATUS_ERR_NO_CHANNEL_ID);
4106     goto out;
4107   }
4108
4109   /* Get channel entry */
4110   channel = silc_idlist_find_channel_by_id(server->local_list,
4111                                            channel_id, NULL);
4112   if (!channel) {
4113     channel = silc_idlist_find_channel_by_id(server->local_list,
4114                                              channel_id, NULL);
4115     if (!channel) {
4116       silc_server_command_send_status_reply(cmd, SILC_COMMAND_KICK,
4117                                             SILC_STATUS_ERR_NO_SUCH_CHANNEL);
4118       goto out;
4119     }
4120   }
4121
4122   /* Check whether sender is on the channel */
4123   if (!silc_server_client_on_channel(client, channel)) {
4124     silc_server_command_send_status_reply(cmd, SILC_COMMAND_KICK,
4125                                           SILC_STATUS_ERR_NOT_ON_CHANNEL);
4126     goto out;
4127   }
4128
4129   /* Check that the kicker is channel operator or channel founder */
4130   silc_hash_table_find(channel->user_list, client, NULL, (void *)&chl);
4131   if (chl->mode == SILC_CHANNEL_UMODE_NONE) {
4132     silc_server_command_send_status_reply(cmd, SILC_COMMAND_KICK,
4133                                           SILC_STATUS_ERR_NO_CHANNEL_PRIV);
4134     goto out;
4135   }
4136
4137   /* Get target Client ID */
4138   tmp = silc_argument_get_arg_type(cmd->args, 2, &tmp_len);
4139   if (!tmp) {
4140     silc_server_command_send_status_reply(cmd, SILC_COMMAND_KICK,
4141                                           SILC_STATUS_ERR_NO_CLIENT_ID);
4142     goto out;
4143   }
4144   client_id = silc_id_payload_parse_id(tmp, tmp_len);
4145   if (!client_id) {
4146     silc_server_command_send_status_reply(cmd, SILC_COMMAND_KICK,
4147                                           SILC_STATUS_ERR_NO_CLIENT_ID);
4148     goto out;
4149   }
4150
4151   /* Get target client's entry */
4152   target_client = silc_idlist_find_client_by_id(server->local_list,
4153                                                 client_id, NULL);
4154   if (!target_client) {
4155     target_client = silc_idlist_find_client_by_id(server->global_list,
4156                                                   client_id, NULL);
4157   }
4158
4159   /* Check that the target client is not channel founder. Channel founder
4160      cannot be kicked from the channel. */
4161   silc_hash_table_find(channel->user_list, target_client, NULL, (void *)&chl);
4162   if (chl->mode & SILC_CHANNEL_UMODE_CHANFO) {
4163     silc_server_command_send_status_reply(cmd, SILC_COMMAND_KICK,
4164                                           SILC_STATUS_ERR_NO_CHANNEL_FOPRIV);
4165     goto out;
4166   }
4167
4168   /* Check whether target client is on the channel */
4169   if (!silc_server_client_on_channel(target_client, channel)) {
4170     silc_server_command_send_status_reply(cmd, SILC_COMMAND_KICK,
4171                                           SILC_STATUS_ERR_USER_NOT_ON_CHANNEL);
4172     goto out;
4173   }
4174
4175   /* Get comment */
4176   tmp_len = 0;
4177   comment = silc_argument_get_arg_type(cmd->args, 3, &tmp_len);
4178   if (tmp_len > 128)
4179     comment = NULL;
4180
4181   /* Send command reply to sender */
4182   silc_server_command_send_status_reply(cmd, SILC_COMMAND_KICK,
4183                                         SILC_STATUS_OK);
4184
4185   /* Send KICKED notify to local clients on the channel */
4186   idp = silc_id_payload_encode(target_client->id, SILC_ID_CLIENT);
4187   silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
4188                                      SILC_NOTIFY_TYPE_KICKED,
4189                                      comment ? 2 : 1,
4190                                      idp->data, idp->len,
4191                                      comment, comment ? strlen(comment) : 0);
4192   silc_buffer_free(idp);
4193
4194   /* Remove the client from the channel. If the channel does not exist
4195      after removing the client then the client kicked itself off the channel
4196      and we don't have to send anything after that. */
4197   if (!silc_server_remove_from_one_channel(server, NULL, channel,
4198                                            target_client, FALSE))
4199     goto out;
4200
4201   /* Send KICKED notify to primary route */
4202   if (!server->standalone)
4203     silc_server_send_notify_kicked(server, server->router->connection,
4204                                    server->server_type == SILC_ROUTER ?
4205                                    TRUE : FALSE, channel,
4206                                    target_client->id, comment);
4207
4208   if (!(channel->mode & SILC_CHANNEL_MODE_PRIVKEY)) {
4209     /* Re-generate channel key */
4210     silc_server_create_channel_key(server, channel, 0);
4211
4212     /* Send the channel key to the channel. The key of course is not sent
4213        to the client who was kicked off the channel. */
4214     silc_server_send_channel_key(server, target_client->connection, channel,
4215                                  server->server_type == SILC_ROUTER ?
4216                                  FALSE : !server->standalone);
4217   }
4218
4219  out:
4220   silc_server_command_free(cmd);
4221 }
4222
4223 /* Server side of OPER command. Client uses this comand to obtain server
4224    operator privileges to this server/router. */
4225
4226 SILC_SERVER_CMD_FUNC(oper)
4227 {
4228   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
4229   SilcServer server = cmd->server;
4230   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
4231   unsigned char *username, *auth;
4232   uint32 tmp_len;
4233   SilcServerConfigSectionAdminConnection *admin;
4234   SilcIDListData idata = (SilcIDListData)client;
4235
4236   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_OPER, cmd, 1, 2);
4237
4238   if (!client || cmd->sock->type != SILC_SOCKET_TYPE_CLIENT)
4239     goto out;
4240
4241   /* Get the username */
4242   username = silc_argument_get_arg_type(cmd->args, 1, &tmp_len);
4243   if (!username) {
4244     silc_server_command_send_status_reply(cmd, SILC_COMMAND_OPER,
4245                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
4246     goto out;
4247   }
4248
4249   /* Get the admin configuration */
4250   admin = silc_server_config_find_admin(server->config, cmd->sock->ip,
4251                                         username, client->nickname);
4252   if (!admin) {
4253     admin = silc_server_config_find_admin(server->config, cmd->sock->hostname,
4254                                           username, client->nickname);
4255     if (!admin) {
4256       silc_server_command_send_status_reply(cmd, SILC_COMMAND_OPER,
4257                                             SILC_STATUS_ERR_AUTH_FAILED);
4258       goto out;
4259     }
4260   }
4261
4262   /* Get the authentication payload */
4263   auth = silc_argument_get_arg_type(cmd->args, 2, &tmp_len);
4264   if (!auth) {
4265     silc_server_command_send_status_reply(cmd, SILC_COMMAND_OPER,
4266                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
4267     goto out;
4268   }
4269
4270   /* Verify the authentication data */
4271   if (!silc_auth_verify_data(auth, tmp_len, admin->auth_meth,
4272                              admin->auth_data, admin->auth_data_len,
4273                              idata->hash, client->id, SILC_ID_CLIENT)) {
4274     silc_server_command_send_status_reply(cmd, SILC_COMMAND_OPER,
4275                                           SILC_STATUS_ERR_AUTH_FAILED);
4276     goto out;
4277   }
4278
4279   /* Client is now server operator */
4280   client->mode |= SILC_UMODE_SERVER_OPERATOR;
4281
4282   /* Send UMODE change to primary router */
4283   if (!server->standalone)
4284     silc_server_send_notify_umode(server, server->router->connection, TRUE,
4285                                   client->id, client->mode);
4286
4287   /* Send reply to the sender */
4288   silc_server_command_send_status_reply(cmd, SILC_COMMAND_OPER,
4289                                         SILC_STATUS_OK);
4290
4291  out:
4292   silc_server_command_free(cmd);
4293 }
4294
4295 /* Server side of SILCOPER command. Client uses this comand to obtain router
4296    operator privileges to this router. */
4297
4298 SILC_SERVER_CMD_FUNC(silcoper)
4299 {
4300   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
4301   SilcServer server = cmd->server;
4302   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
4303   unsigned char *username, *auth;
4304   uint32 tmp_len;
4305   SilcServerConfigSectionAdminConnection *admin;
4306   SilcIDListData idata = (SilcIDListData)client;
4307
4308   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_SILCOPER, cmd, 1, 2);
4309
4310   if (!client || cmd->sock->type != SILC_SOCKET_TYPE_CLIENT)
4311     goto out;
4312
4313   if (server->server_type == SILC_SERVER) {
4314     silc_server_command_send_status_reply(cmd, SILC_COMMAND_SILCOPER,
4315                                           SILC_STATUS_ERR_AUTH_FAILED);
4316     goto out;
4317   }
4318
4319   /* Get the username */
4320   username = silc_argument_get_arg_type(cmd->args, 1, &tmp_len);
4321   if (!username) {
4322     silc_server_command_send_status_reply(cmd, SILC_COMMAND_SILCOPER,
4323                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
4324     goto out;
4325   }
4326
4327   /* Get the admin configuration */
4328   admin = silc_server_config_find_admin(server->config, cmd->sock->ip,
4329                                         username, client->nickname);
4330   if (!admin) {
4331     admin = silc_server_config_find_admin(server->config, cmd->sock->hostname,
4332                                           username, client->nickname);
4333     if (!admin) {
4334       silc_server_command_send_status_reply(cmd, SILC_COMMAND_SILCOPER,
4335                                             SILC_STATUS_ERR_AUTH_FAILED);
4336       goto out;
4337     }
4338   }
4339
4340   /* Get the authentication payload */
4341   auth = silc_argument_get_arg_type(cmd->args, 2, &tmp_len);
4342   if (!auth) {
4343     silc_server_command_send_status_reply(cmd, SILC_COMMAND_SILCOPER,
4344                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
4345     goto out;
4346   }
4347
4348   /* Verify the authentication data */
4349   if (!silc_auth_verify_data(auth, tmp_len, admin->auth_meth,
4350                              admin->auth_data, admin->auth_data_len,
4351                              idata->hash, client->id, SILC_ID_CLIENT)) {
4352     silc_server_command_send_status_reply(cmd, SILC_COMMAND_SILCOPER,
4353                                           SILC_STATUS_ERR_AUTH_FAILED);
4354     goto out;
4355   }
4356
4357   /* Client is now router operator */
4358   client->mode |= SILC_UMODE_ROUTER_OPERATOR;
4359
4360   /* Send UMODE change to primary router */
4361   if (!server->standalone)
4362     silc_server_send_notify_umode(server, server->router->connection, TRUE,
4363                                   client->id, client->mode);
4364
4365   /* Send reply to the sender */
4366   silc_server_command_send_status_reply(cmd, SILC_COMMAND_SILCOPER,
4367                                         SILC_STATUS_OK);
4368
4369  out:
4370   silc_server_command_free(cmd);
4371 }
4372
4373 /* Server side command of CONNECT. Connects us to the specified remote
4374    server or router. */
4375
4376 SILC_SERVER_CMD_FUNC(connect)
4377 {
4378   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
4379   SilcServer server = cmd->server;
4380   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
4381   unsigned char *tmp, *host;
4382   uint32 tmp_len;
4383   uint32 port = SILC_PORT;
4384
4385   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_CONNECT, cmd, 1, 2);
4386
4387   if (!client || cmd->sock->type != SILC_SOCKET_TYPE_CLIENT)
4388     goto out;
4389
4390   /* Check whether client has the permissions. */
4391   if (client->mode == SILC_UMODE_NONE) {
4392     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CONNECT,
4393                                           SILC_STATUS_ERR_NO_SERVER_PRIV);
4394     goto out;
4395   }
4396
4397   if (server->server_type == SILC_ROUTER &&
4398       client->mode & SILC_UMODE_SERVER_OPERATOR) {
4399     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CONNECT,
4400                                           SILC_STATUS_ERR_NO_ROUTER_PRIV);
4401     goto out;
4402   }
4403
4404   /* Get the remote server */
4405   host = silc_argument_get_arg_type(cmd->args, 1, &tmp_len);
4406   if (!host) {
4407     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CONNECT,
4408                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
4409     goto out;
4410   }
4411
4412   /* Get port */
4413   tmp = silc_argument_get_arg_type(cmd->args, 2, &tmp_len);
4414   if (tmp)
4415     SILC_GET32_MSB(port, tmp);
4416
4417   /* Create the connection. It is done with timeout and is async. */
4418   silc_server_create_connection(server, host, port);
4419
4420   /* Send reply to the sender */
4421   silc_server_command_send_status_reply(cmd, SILC_COMMAND_CONNECT,
4422                                         SILC_STATUS_OK);
4423
4424  out:
4425   silc_server_command_free(cmd);
4426 }
4427
4428 /* Server side of command BAN. This is used to manage the ban list of the
4429    channel. To add clients and remove clients from the ban list. */
4430
4431 SILC_SERVER_CMD_FUNC(ban)
4432 {
4433   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
4434   SilcServer server = cmd->server;
4435   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
4436   SilcBuffer packet;
4437   SilcChannelEntry channel;
4438   SilcChannelClientEntry chl;
4439   SilcChannelID *channel_id = NULL;
4440   unsigned char *id, *add, *del;
4441   uint32 id_len, tmp_len;
4442   uint16 ident = silc_command_get_ident(cmd->payload);
4443
4444   if (cmd->sock->type != SILC_SOCKET_TYPE_CLIENT)
4445     goto out;
4446
4447   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_BAN, cmd, 0, 3);
4448
4449   /* Get Channel ID */
4450   id = silc_argument_get_arg_type(cmd->args, 1, &id_len);
4451   if (id) {
4452     channel_id = silc_id_payload_parse_id(id, id_len);
4453     if (!channel_id) {
4454       silc_server_command_send_status_reply(cmd, SILC_COMMAND_BAN,
4455                                             SILC_STATUS_ERR_NO_CHANNEL_ID);
4456       goto out;
4457     }
4458   }
4459
4460   /* Get channel entry. The server must know about the channel since the
4461      client is expected to be on the channel. */
4462   channel = silc_idlist_find_channel_by_id(server->local_list,
4463                                            channel_id, NULL);
4464   if (!channel) {
4465     channel = silc_idlist_find_channel_by_id(server->global_list,
4466                                              channel_id, NULL);
4467     if (!channel) {
4468       silc_server_command_send_status_reply(cmd, SILC_COMMAND_BAN,
4469                                             SILC_STATUS_ERR_NO_SUCH_CHANNEL);
4470       goto out;
4471     }
4472   }
4473
4474   /* Check whether this client is on the channel */
4475   if (!silc_server_client_on_channel(client, channel)) {
4476     silc_server_command_send_status_reply(cmd, SILC_COMMAND_BAN,
4477                                           SILC_STATUS_ERR_NOT_ON_CHANNEL);
4478     goto out;
4479   }
4480
4481   /* Get entry to the channel user list */
4482   silc_hash_table_find(channel->user_list, client, NULL, (void *)&chl);
4483
4484   /* The client must be at least channel operator. */
4485   if (!(chl->mode & SILC_CHANNEL_UMODE_CHANOP)) {
4486     silc_server_command_send_status_reply(cmd, SILC_COMMAND_BAN,
4487                                           SILC_STATUS_ERR_NO_CHANNEL_PRIV);
4488     goto out;
4489   }
4490
4491   /* Get the new ban and add it to the ban list */
4492   add = silc_argument_get_arg_type(cmd->args, 2, &tmp_len);
4493   if (add) {
4494     if (!channel->ban_list)
4495       channel->ban_list = silc_calloc(tmp_len + 2, sizeof(*channel->ban_list));
4496     else
4497       channel->ban_list = silc_realloc(channel->ban_list,
4498                                        sizeof(*channel->ban_list) *
4499                                        (tmp_len +
4500                                         strlen(channel->ban_list) + 2));
4501     if (add[tmp_len - 1] == ',')
4502       add[tmp_len - 1] = '\0';
4503
4504     strncat(channel->ban_list, add, tmp_len);
4505     strncat(channel->ban_list, ",", 1);
4506   }
4507
4508   /* Get the ban to be removed and remove it from the list */
4509   del = silc_argument_get_arg_type(cmd->args, 3, &tmp_len);
4510   if (del && channel->ban_list) {
4511     char *start, *end, *n;
4512
4513     if (!strncmp(channel->ban_list, del, strlen(channel->ban_list) - 1)) {
4514       silc_free(channel->ban_list);
4515       channel->ban_list = NULL;
4516     } else {
4517       start = strstr(channel->ban_list, del);
4518       if (start && strlen(start) >= tmp_len) {
4519         end = start + tmp_len;
4520         n = silc_calloc(strlen(channel->ban_list) - tmp_len, sizeof(*n));
4521         strncat(n, channel->ban_list, start - channel->ban_list);
4522         strncat(n, end + 1, ((channel->ban_list + strlen(channel->ban_list)) -
4523                              end) - 1);
4524         silc_free(channel->ban_list);
4525         channel->ban_list = n;
4526       }
4527     }
4528   }
4529
4530   /* Send the BAN notify type to our primary router. */
4531   if (!server->standalone && (add || del))
4532     silc_server_send_notify_ban(server, server->router->connection,
4533                                 server->server_type == SILC_ROUTER ?
4534                                 TRUE : FALSE, channel, add, del);
4535
4536   /* Send the reply back to the client */
4537   if (channel->ban_list)
4538     packet =
4539       silc_command_reply_payload_encode_va(SILC_COMMAND_BAN,
4540                                            SILC_STATUS_OK, ident, 2,
4541                                            2, id, id_len,
4542                                            3, channel->ban_list,
4543                                            strlen(channel->ban_list) - 1);
4544   else
4545     packet =
4546       silc_command_reply_payload_encode_va(SILC_COMMAND_BAN,
4547                                            SILC_STATUS_OK, ident, 1,
4548                                            2, id, id_len);
4549
4550   silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0,
4551                           packet->data, packet->len, FALSE);
4552
4553   silc_buffer_free(packet);
4554
4555  out:
4556   if (channel_id)
4557     silc_free(channel_id);
4558   silc_server_command_free(cmd);
4559 }
4560
4561 /* Server side command of CLOSE. Closes connection to a specified server. */
4562
4563 SILC_SERVER_CMD_FUNC(close)
4564 {
4565   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
4566   SilcServer server = cmd->server;
4567   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
4568   SilcServerEntry server_entry;
4569   SilcSocketConnection sock;
4570   unsigned char *tmp;
4571   uint32 tmp_len;
4572   unsigned char *name;
4573   uint32 port = SILC_PORT;
4574
4575   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_CLOSE, cmd, 1, 2);
4576
4577   if (!client || cmd->sock->type != SILC_SOCKET_TYPE_CLIENT)
4578     goto out;
4579
4580   /* Check whether client has the permissions. */
4581   if (client->mode == SILC_UMODE_NONE) {
4582     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CLOSE,
4583                                           SILC_STATUS_ERR_NO_SERVER_PRIV);
4584     goto out;
4585   }
4586
4587   /* Get the remote server */
4588   name = silc_argument_get_arg_type(cmd->args, 1, &tmp_len);
4589   if (!name) {
4590     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CLOSE,
4591                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
4592     goto out;
4593   }
4594
4595   /* Get port */
4596   tmp = silc_argument_get_arg_type(cmd->args, 2, &tmp_len);
4597   if (tmp)
4598     SILC_GET32_MSB(port, tmp);
4599
4600   server_entry = silc_idlist_find_server_by_conn(server->local_list,
4601                                                  name, port, NULL);
4602   if (!server_entry) {
4603     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CLOSE,
4604                                           SILC_STATUS_ERR_NO_SERVER_ID);
4605     goto out;
4606   }
4607
4608   /* Send reply to the sender */
4609   silc_server_command_send_status_reply(cmd, SILC_COMMAND_CLOSE,
4610                                         SILC_STATUS_OK);
4611
4612   /* Close the connection to the server */
4613   sock = (SilcSocketConnection)server_entry->connection;
4614   silc_server_free_sock_user_data(server, sock);
4615   silc_server_close_connection(server, sock);
4616
4617  out:
4618   silc_server_command_free(cmd);
4619 }
4620
4621 /* Server side command of SHUTDOWN. Shutdowns the server and closes all
4622    active connections. */
4623
4624 SILC_SERVER_CMD_FUNC(shutdown)
4625 {
4626   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
4627   SilcServer server = cmd->server;
4628   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
4629
4630   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_SHUTDOWN, cmd, 0, 0);
4631
4632   if (!client || cmd->sock->type != SILC_SOCKET_TYPE_CLIENT)
4633     goto out;
4634
4635   /* Check whether client has the permission. */
4636   if (client->mode == SILC_UMODE_NONE) {
4637     silc_server_command_send_status_reply(cmd, SILC_COMMAND_SHUTDOWN,
4638                                           SILC_STATUS_ERR_NO_SERVER_PRIV);
4639     goto out;
4640   }
4641
4642   /* Send reply to the sender */
4643   silc_server_command_send_status_reply(cmd, SILC_COMMAND_SHUTDOWN,
4644                                         SILC_STATUS_OK);
4645
4646   /* Then, gracefully, or not, bring the server down. */
4647   silc_server_stop(server);
4648   exit(0);
4649
4650  out:
4651   silc_server_command_free(cmd);
4652 }
4653
4654 /* Server side command of LEAVE. Removes client from a channel. */
4655
4656 SILC_SERVER_CMD_FUNC(leave)
4657 {
4658   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
4659   SilcServer server = cmd->server;
4660   SilcSocketConnection sock = cmd->sock;
4661   SilcClientEntry id_entry = (SilcClientEntry)cmd->sock->user_data;
4662   SilcChannelID *id = NULL;
4663   SilcChannelEntry channel;
4664   uint32 len;
4665   unsigned char *tmp;
4666
4667   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_LEAVE, cmd, 1, 2);
4668
4669   /* Get Channel ID */
4670   tmp = silc_argument_get_arg_type(cmd->args, 1, &len);
4671   if (!tmp) {
4672     silc_server_command_send_status_reply(cmd, SILC_COMMAND_LEAVE,
4673                                           SILC_STATUS_ERR_NO_CHANNEL_ID);
4674     goto out;
4675   }
4676   id = silc_id_payload_parse_id(tmp, len);
4677   if (!id) {
4678     silc_server_command_send_status_reply(cmd, SILC_COMMAND_LEAVE,
4679                                           SILC_STATUS_ERR_NO_CHANNEL_ID);
4680     goto out;
4681   }
4682
4683   /* Get channel entry */
4684   channel = silc_idlist_find_channel_by_id(server->local_list, id, NULL);
4685   if (!channel) {
4686     channel = silc_idlist_find_channel_by_id(server->global_list, id, NULL);
4687     if (!channel) {
4688       silc_server_command_send_status_reply(cmd, SILC_COMMAND_LEAVE,
4689                                             SILC_STATUS_ERR_NO_SUCH_CHANNEL);
4690       goto out;
4691     }
4692   }
4693
4694   /* Check whether this client is on the channel */
4695   if (!silc_server_client_on_channel(id_entry, channel)) {
4696     silc_server_command_send_status_reply(cmd, SILC_COMMAND_LEAVE,
4697                                           SILC_STATUS_ERR_NOT_ON_CHANNEL);
4698     goto out;
4699   }
4700
4701   /* Notify routers that they should remove this client from their list
4702      of clients on the channel. Send LEAVE notify type. */
4703   if (!server->standalone)
4704     silc_server_send_notify_leave(server, server->router->connection,
4705                                   server->server_type == SILC_ROUTER ?
4706                                   TRUE : FALSE, channel, id_entry->id);
4707
4708   silc_server_command_send_status_reply(cmd, SILC_COMMAND_LEAVE,
4709                                         SILC_STATUS_OK);
4710
4711   /* Remove client from channel */
4712   if (!silc_server_remove_from_one_channel(server, sock, channel, id_entry,
4713                                            TRUE))
4714     /* If the channel does not exist anymore we won't send anything */
4715     goto out;
4716
4717   if (!(channel->mode & SILC_CHANNEL_MODE_PRIVKEY)) {
4718     /* Re-generate channel key */
4719     silc_server_create_channel_key(server, channel, 0);
4720
4721     /* Send the channel key */
4722     silc_server_send_channel_key(server, NULL, channel,
4723                                  server->server_type == SILC_ROUTER ?
4724                                  FALSE : !server->standalone);
4725   }
4726
4727  out:
4728   if (id)
4729     silc_free(id);
4730   silc_server_command_free(cmd);
4731 }
4732
4733 /* Server side of command USERS. Resolves clients and their USERS currently
4734    joined on the requested channel. The list of Client ID's and their modes
4735    on the channel is sent back. */
4736
4737 SILC_SERVER_CMD_FUNC(users)
4738 {
4739   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
4740   SilcServer server = cmd->server;
4741   SilcChannelEntry channel;
4742   SilcChannelID *id = NULL;
4743   SilcBuffer packet, idp;
4744   unsigned char *channel_id;
4745   uint32 channel_id_len;
4746   SilcBuffer client_id_list;
4747   SilcBuffer client_mode_list;
4748   unsigned char lc[4];
4749   uint32 list_count = 0;
4750   uint16 ident = silc_command_get_ident(cmd->payload);
4751   char *channel_name;
4752
4753   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_USERS, cmd, 1, 2);
4754
4755   /* Get Channel ID */
4756   channel_id = silc_argument_get_arg_type(cmd->args, 1, &channel_id_len);
4757
4758   /* Get channel name */
4759   channel_name = silc_argument_get_arg_type(cmd->args, 2, NULL);
4760
4761   if (!channel_id && !channel_name) {
4762     silc_server_command_send_status_reply(cmd, SILC_COMMAND_USERS,
4763                                           SILC_STATUS_ERR_NO_CHANNEL_ID);
4764     goto out;
4765   }
4766
4767   if (channel_id) {
4768     id = silc_id_payload_parse_id(channel_id, channel_id_len);
4769     if (!id) {
4770       silc_server_command_send_status_reply(cmd, SILC_COMMAND_USERS,
4771                                             SILC_STATUS_ERR_NO_CHANNEL_ID);
4772       goto out;
4773     }
4774   }
4775
4776   /* If we are server and we don't know about this channel we will send
4777      the command to our router. If we know about the channel then we also
4778      have the list of users already. */
4779   if (id)
4780     channel = silc_idlist_find_channel_by_id(server->local_list, id, NULL);
4781   else
4782     channel = silc_idlist_find_channel_by_name(server->local_list,
4783                                                channel_name, NULL);
4784
4785   if (!channel) {
4786     if (server->server_type == SILC_SERVER && !server->standalone &&
4787         !cmd->pending) {
4788       SilcBuffer tmpbuf;
4789
4790       silc_command_set_ident(cmd->payload, silc_rng_get_rn16(server->rng));
4791       tmpbuf = silc_command_payload_encode_payload(cmd->payload);
4792
4793       /* Send USERS command */
4794       silc_server_packet_send(server, server->router->connection,
4795                               SILC_PACKET_COMMAND, cmd->packet->flags,
4796                               tmpbuf->data, tmpbuf->len, TRUE);
4797
4798       /* Reprocess this packet after received reply */
4799       silc_server_command_pending(server, SILC_COMMAND_USERS,
4800                                   silc_command_get_ident(cmd->payload),
4801                                   silc_server_command_destructor,
4802                                   silc_server_command_users,
4803                                   silc_server_command_dup(cmd));
4804       cmd->pending = TRUE;
4805       silc_command_set_ident(cmd->payload, ident);
4806
4807       silc_buffer_free(tmpbuf);
4808       silc_free(id);
4809       return;
4810     }
4811
4812     /* Check the global list as well. */
4813     if (id)
4814       channel = silc_idlist_find_channel_by_id(server->global_list, id, NULL);
4815     else
4816       channel = silc_idlist_find_channel_by_name(server->global_list,
4817                                                  channel_name, NULL);
4818     if (!channel) {
4819       /* Channel really does not exist */
4820       silc_server_command_send_status_reply(cmd, SILC_COMMAND_USERS,
4821                                             SILC_STATUS_ERR_NO_SUCH_CHANNEL);
4822       goto out;
4823     }
4824   }
4825
4826   /* If the channel is private or secret do not send anything */
4827   if (channel->mode & (SILC_CHANNEL_MODE_PRIVATE | SILC_CHANNEL_MODE_SECRET)) {
4828     silc_server_command_send_status_reply(cmd, SILC_COMMAND_USERS,
4829                                           SILC_STATUS_ERR_NO_SUCH_CHANNEL);
4830     goto out;
4831   }
4832
4833   /* Get the users list */
4834   silc_server_get_users_on_channel(server, channel, &client_id_list,
4835                                    &client_mode_list, &list_count);
4836
4837   /* List count */
4838   SILC_PUT32_MSB(list_count, lc);
4839
4840   /* Send reply */
4841   idp = silc_id_payload_encode(channel->id, SILC_ID_CHANNEL);
4842   packet = silc_command_reply_payload_encode_va(SILC_COMMAND_USERS,
4843                                                 SILC_STATUS_OK, ident, 4,
4844                                                 2, idp->data, idp->len,
4845                                                 3, lc, 4,
4846                                                 4, client_id_list->data,
4847                                                 client_id_list->len,
4848                                                 5, client_mode_list->data,
4849                                                 client_mode_list->len);
4850   silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0,
4851                           packet->data, packet->len, FALSE);
4852
4853   silc_buffer_free(idp);
4854   silc_buffer_free(packet);
4855   silc_buffer_free(client_id_list);
4856   silc_buffer_free(client_mode_list);
4857   if (id)
4858     silc_free(id);
4859
4860  out:
4861   silc_server_command_free(cmd);
4862 }
4863
4864 /* Server side of command GETKEY. This fetches the client's public key
4865    from the server where to the client is connected. */
4866
4867 SILC_SERVER_CMD_FUNC(getkey)
4868 {
4869   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
4870   SilcServer server = cmd->server;
4871   SilcBuffer packet;
4872   SilcClientEntry client;
4873   SilcServerEntry server_entry;
4874   SilcClientID *client_id = NULL;
4875   SilcServerID *server_id = NULL;
4876   SilcIDPayload idp = NULL;
4877   uint16 ident = silc_command_get_ident(cmd->payload);
4878   unsigned char *tmp;
4879   uint32 tmp_len;
4880   SilcBuffer pk;
4881   SilcIdType id_type;
4882
4883   SILC_LOG_DEBUG(("Start"));
4884
4885   tmp = silc_argument_get_arg_type(cmd->args, 1, &tmp_len);
4886   if (!tmp) {
4887     silc_server_command_send_status_reply(cmd, SILC_COMMAND_GETKEY,
4888                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
4889     goto out;
4890   }
4891   idp = silc_id_payload_parse_data(tmp, tmp_len);
4892   if (!idp) {
4893     silc_server_command_send_status_reply(cmd, SILC_COMMAND_GETKEY,
4894                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
4895     goto out;
4896   }
4897
4898   id_type = silc_id_payload_get_type(idp);
4899   if (id_type == SILC_ID_CLIENT) {
4900     client_id = silc_id_payload_get_id(idp);
4901
4902     /* If the client is not found from local list there is no chance it
4903        would be locally connected client so send the command further. */
4904     client = silc_idlist_find_client_by_id(server->local_list,
4905                                            client_id, NULL);
4906     if (!client)
4907       client = silc_idlist_find_client_by_id(server->global_list,
4908                                              client_id, NULL);
4909
4910     if ((!client && !cmd->pending && !server->standalone) ||
4911         (client && !client->connection && !cmd->pending &&
4912          !server->standalone) ||
4913         (client && !client->data.public_key && !cmd->pending &&
4914          !server->standalone)) {
4915       SilcBuffer tmpbuf;
4916       uint16 old_ident;
4917       SilcSocketConnection dest_sock;
4918
4919       dest_sock = silc_server_get_client_route(server, NULL, 0,
4920                                                client_id, NULL);
4921       if (!dest_sock)
4922         goto out;
4923
4924       old_ident = silc_command_get_ident(cmd->payload);
4925       silc_command_set_ident(cmd->payload, silc_rng_get_rn16(server->rng));
4926       tmpbuf = silc_command_payload_encode_payload(cmd->payload);
4927
4928       silc_server_packet_send(server, dest_sock,
4929                               SILC_PACKET_COMMAND, cmd->packet->flags,
4930                               tmpbuf->data, tmpbuf->len, TRUE);
4931
4932       /* Reprocess this packet after received reply from router */
4933       silc_server_command_pending(server, SILC_COMMAND_GETKEY,
4934                                   silc_command_get_ident(cmd->payload),
4935                                   silc_server_command_destructor,
4936                                   silc_server_command_getkey,
4937                                   silc_server_command_dup(cmd));
4938       cmd->pending = TRUE;
4939
4940       silc_command_set_ident(cmd->payload, old_ident);
4941       silc_buffer_free(tmpbuf);
4942       return;
4943     }
4944
4945     if (!client && cmd->pending) {
4946       silc_server_command_send_status_reply(cmd, SILC_COMMAND_GETKEY,
4947                                             SILC_STATUS_ERR_NO_SUCH_CLIENT_ID);
4948       goto out;
4949     }
4950
4951     /* The client is locally connected, just get the public key and
4952        send it back. */
4953     tmp = silc_pkcs_public_key_encode(client->data.public_key, &tmp_len);
4954     pk = silc_buffer_alloc(4 + tmp_len);
4955     silc_buffer_pull_tail(pk, SILC_BUFFER_END(pk));
4956     silc_buffer_format(pk,
4957                        SILC_STR_UI_SHORT(tmp_len),
4958                        SILC_STR_UI_SHORT(SILC_SKE_PK_TYPE_SILC),
4959                        SILC_STR_UI_XNSTRING(tmp, tmp_len),
4960                        SILC_STR_END);
4961     silc_free(tmp);
4962
4963   } else if (id_type == SILC_ID_SERVER) {
4964     server_id = silc_id_payload_get_id(idp);
4965
4966     /* If the server is not found from local list there is no chance it
4967        would be locally connected server so send the command further. */
4968     server_entry = silc_idlist_find_server_by_id(server->local_list,
4969                                                  server_id, NULL);
4970     if (!server_entry)
4971       server_entry = silc_idlist_find_server_by_id(server->global_list,
4972                                                    server_id, NULL);
4973
4974     if ((!server_entry && !cmd->pending && !server->standalone) ||
4975         (server_entry && !server_entry->connection && !cmd->pending &&
4976          !server->standalone) ||
4977         (server_entry && !server_entry->data.public_key && !cmd->pending &&
4978          !server->standalone)) {
4979       SilcBuffer tmpbuf;
4980       uint16 old_ident;
4981
4982       old_ident = silc_command_get_ident(cmd->payload);
4983       silc_command_set_ident(cmd->payload, silc_rng_get_rn16(server->rng));
4984       tmpbuf = silc_command_payload_encode_payload(cmd->payload);
4985
4986       silc_server_packet_send(server, server->router->connection,
4987                               SILC_PACKET_COMMAND, cmd->packet->flags,
4988                               tmpbuf->data, tmpbuf->len, TRUE);
4989
4990       /* Reprocess this packet after received reply from router */
4991       silc_server_command_pending(server, SILC_COMMAND_GETKEY,
4992                                   silc_command_get_ident(cmd->payload),
4993                                   silc_server_command_destructor,
4994                                   silc_server_command_getkey,
4995                                   silc_server_command_dup(cmd));
4996       cmd->pending = TRUE;
4997
4998       silc_command_set_ident(cmd->payload, old_ident);
4999       silc_buffer_free(tmpbuf);
5000       return;
5001     }
5002
5003     if (!server_entry && cmd->pending) {
5004       silc_server_command_send_status_reply(cmd, SILC_COMMAND_GETKEY,
5005                                             SILC_STATUS_ERR_NO_SUCH_SERVER_ID);
5006       goto out;
5007     }
5008
5009     /* The client is locally connected, just get the public key and
5010        send it back. */
5011     tmp = silc_pkcs_public_key_encode(server_entry->data.public_key, &tmp_len);
5012     pk = silc_buffer_alloc(4 + tmp_len);
5013     silc_buffer_pull_tail(pk, SILC_BUFFER_END(pk));
5014     silc_buffer_format(pk,
5015                        SILC_STR_UI_SHORT(tmp_len),
5016                        SILC_STR_UI_SHORT(SILC_SKE_PK_TYPE_SILC),
5017                        SILC_STR_UI_XNSTRING(tmp, tmp_len),
5018                        SILC_STR_END);
5019     silc_free(tmp);
5020   } else {
5021     goto out;
5022   }
5023
5024   tmp = silc_argument_get_arg_type(cmd->args, 1, &tmp_len);
5025   packet = silc_command_reply_payload_encode_va(SILC_COMMAND_GETKEY,
5026                                                 SILC_STATUS_OK, ident, 2,
5027                                                 2, tmp, tmp_len,
5028                                                 3, pk->data, pk->len);
5029   silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0,
5030                           packet->data, packet->len, FALSE);
5031   silc_buffer_free(packet);
5032   silc_buffer_free(pk);
5033
5034  out:
5035   if (idp)
5036     silc_id_payload_free(idp);
5037   silc_free(client_id);
5038   silc_free(server_id);
5039   silc_server_command_free(cmd);
5040 }