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], TRUE, NULL);
 773       if (!entry && check_global)
 774         entry = silc_idlist_find_client_by_id(server->global_list,
 775                                               client_id[i], TRUE, 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, TRUE, NULL);
1254       if (!entry && check_global)
1255         entry = silc_idlist_find_server_by_name(server->local_list,
1256                                                 tmp, TRUE, 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, TRUE, NULL);
1327         if (!entry && check_global)
1328           entry = (void *)silc_idlist_find_client_by_id(server->global_list,
1329                                                         id, TRUE, 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, TRUE, NULL);
1346         if (!entry && check_global)
1347           entry = (void *)silc_idlist_find_server_by_id(server->global_list,
1348                                                         id, TRUE, 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, TRUE, NULL);
2486   if (!remote_client) {
2487     remote_client = silc_idlist_find_client_by_id(server->global_list,
2488                                                   client_id, TRUE, 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   /* Get comment */
2497   comment = silc_argument_get_arg_type(cmd->args, 2, &tmp_len2);
2498   if (tmp_len2 > 128)
2499     comment = NULL;
2500
2501   /* Send reply to the sender */
2502   silc_server_command_send_status_reply(cmd, SILC_COMMAND_KILL,
2503                                         SILC_STATUS_OK);
2504
2505   /* Send the KILL notify packets. First send it to the channel, then
2506      to our primary router and then directly to the client who is being
2507      killed right now. */
2508
2509   /* Send KILLED notify to the channels. It is not sent to the client
2510      as it will be sent differently destined directly to the client and not
2511      to the channel. */
2512   silc_server_send_notify_on_channels(server, remote_client,
2513                                       remote_client, SILC_NOTIFY_TYPE_KILLED,
2514                                       comment ? 2 : 1,
2515                                       tmp, tmp_len,
2516                                       comment, comment ? tmp_len2 : 0);
2517
2518   /* Send KILLED notify to primary route */
2519   if (!server->standalone)
2520     silc_server_send_notify_killed(server, server->router->connection, TRUE,
2521                                    remote_client->id, comment);
2522
2523   /* Send KILLED notify to the client directly */
2524   silc_server_send_notify_killed(server, remote_client->connection ?
2525                                  remote_client->connection :
2526                                  remote_client->router->connection, FALSE,
2527                                  remote_client->id, comment);
2528
2529   /* Remove the client from all channels. This generates new keys to the
2530      channels as well. */
2531   silc_server_remove_from_channels(server, NULL, remote_client, FALSE,
2532                                    NULL, TRUE);
2533
2534   /* Remove the client entry, If it is locally connected then we will also
2535      disconnect the client here */
2536   if (remote_client->data.registered && remote_client->connection) {
2537     /* Remove locally conneted client */
2538     SilcSocketConnection sock = remote_client->connection;
2539     silc_server_free_client_data(server, sock, remote_client, FALSE, NULL);
2540     silc_server_close_connection(server, sock);
2541   } else {
2542     /* Remove remote client */
2543     if (!silc_idlist_del_client(server->global_list, remote_client))
2544       silc_idlist_del_client(server->local_list, remote_client);
2545   }
2546
2547  out:
2548   silc_server_command_free(cmd);
2549 }
2550
2551 /* Server side of command INFO. This sends information about us to
2552    the client. If client requested specific server we will send the
2553    command to that server. */
2554
2555 SILC_SERVER_CMD_FUNC(info)
2556 {
2557   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
2558   SilcServer server = cmd->server;
2559   SilcBuffer packet, idp;
2560   unsigned char *tmp;
2561   uint32 tmp_len;
2562   char *dest_server, *server_info = NULL, *server_name;
2563   uint16 ident = silc_command_get_ident(cmd->payload);
2564   SilcServerEntry entry = NULL;
2565   SilcServerID *server_id = NULL;
2566
2567   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_INFO, cmd, 0, 2);
2568
2569   /* Get server name */
2570   dest_server = silc_argument_get_arg_type(cmd->args, 1, NULL);
2571
2572   /* Get Server ID */
2573   tmp = silc_argument_get_arg_type(cmd->args, 2, &tmp_len);
2574   if (tmp) {
2575     server_id = silc_id_payload_parse_id(tmp, tmp_len);
2576     if (!server_id) {
2577       silc_server_command_send_status_reply(cmd, SILC_COMMAND_INFO,
2578                                             SILC_STATUS_ERR_NO_SERVER_ID);
2579       goto out;
2580     }
2581   }
2582
2583   if (server_id) {
2584     /* Check whether we have this server cached */
2585     entry = silc_idlist_find_server_by_id(server->local_list,
2586                                           server_id, TRUE, NULL);
2587     if (!entry) {
2588       entry = silc_idlist_find_server_by_id(server->global_list,
2589                                             server_id, TRUE, NULL);
2590       if (!entry && server->server_type == SILC_ROUTER) {
2591         silc_server_command_send_status_reply(cmd, SILC_COMMAND_INFO,
2592                                               SILC_STATUS_ERR_NO_SUCH_SERVER);
2593         goto out;
2594       }
2595     }
2596   }
2597
2598   if ((!dest_server && !server_id && !entry) || (entry &&
2599                                                  entry == server->id_entry) ||
2600       (dest_server && !cmd->pending &&
2601        !strncasecmp(dest_server, server->server_name, strlen(dest_server)))) {
2602     /* Send our reply */
2603     char info_string[256];
2604
2605     memset(info_string, 0, sizeof(info_string));
2606     snprintf(info_string, sizeof(info_string),
2607              "location: %s server: %s admin: %s <%s>",
2608              server->config->admin_info->location,
2609              server->config->admin_info->server_type,
2610              server->config->admin_info->admin_name,
2611              server->config->admin_info->admin_email);
2612
2613     server_info = info_string;
2614     entry = server->id_entry;
2615   } else {
2616     /* Check whether we have this server cached */
2617     if (!entry && dest_server) {
2618       entry = silc_idlist_find_server_by_name(server->global_list,
2619                                               dest_server, TRUE, NULL);
2620       if (!entry) {
2621         entry = silc_idlist_find_server_by_name(server->local_list,
2622                                                 dest_server, TRUE, NULL);
2623       }
2624     }
2625
2626     if (!cmd->pending &&
2627         server->server_type == SILC_ROUTER && entry && !entry->server_info) {
2628       /* Send to the server */
2629       SilcBuffer tmpbuf;
2630       uint16 old_ident;
2631
2632       old_ident = silc_command_get_ident(cmd->payload);
2633       silc_command_set_ident(cmd->payload, silc_rng_get_rn16(server->rng));
2634       tmpbuf = silc_command_payload_encode_payload(cmd->payload);
2635
2636       silc_server_packet_send(server, entry->connection,
2637                               SILC_PACKET_COMMAND, cmd->packet->flags,
2638                               tmpbuf->data, tmpbuf->len, TRUE);
2639
2640       /* Reprocess this packet after received reply from router */
2641       silc_server_command_pending(server, SILC_COMMAND_INFO,
2642                                   silc_command_get_ident(cmd->payload),
2643                                   silc_server_command_destructor,
2644                                   silc_server_command_info,
2645                                   silc_server_command_dup(cmd));
2646       cmd->pending = TRUE;
2647       silc_command_set_ident(cmd->payload, old_ident);
2648       silc_buffer_free(tmpbuf);
2649       return;
2650     }
2651
2652     if (!entry && !cmd->pending && !server->standalone) {
2653       /* Send to the primary router */
2654       SilcBuffer tmpbuf;
2655       uint16 old_ident;
2656
2657       old_ident = silc_command_get_ident(cmd->payload);
2658       silc_command_set_ident(cmd->payload, silc_rng_get_rn16(server->rng));
2659       tmpbuf = silc_command_payload_encode_payload(cmd->payload);
2660
2661       silc_server_packet_send(server, server->router->connection,
2662                               SILC_PACKET_COMMAND, cmd->packet->flags,
2663                               tmpbuf->data, tmpbuf->len, TRUE);
2664
2665       /* Reprocess this packet after received reply from router */
2666       silc_server_command_pending(server, SILC_COMMAND_INFO,
2667                                   silc_command_get_ident(cmd->payload),
2668                                   silc_server_command_destructor,
2669                                   silc_server_command_info,
2670                                   silc_server_command_dup(cmd));
2671       cmd->pending = TRUE;
2672       silc_command_set_ident(cmd->payload, old_ident);
2673       silc_buffer_free(tmpbuf);
2674       return;
2675     }
2676   }
2677
2678   if (server_id)
2679     silc_free(server_id);
2680
2681   if (!entry) {
2682     silc_server_command_send_status_reply(cmd, SILC_COMMAND_INFO,
2683                                           SILC_STATUS_ERR_NO_SUCH_SERVER);
2684     goto out;
2685   }
2686
2687   idp = silc_id_payload_encode(entry->id, SILC_ID_SERVER);
2688   if (!server_info)
2689     server_info = entry->server_info;
2690   server_name = entry->server_name;
2691
2692   /* Send the reply */
2693   if (server_info)
2694     packet = silc_command_reply_payload_encode_va(SILC_COMMAND_INFO,
2695                                                   SILC_STATUS_OK, ident, 3,
2696                                                   2, idp->data, idp->len,
2697                                                   3, server_name,
2698                                                   strlen(server_name),
2699                                                   4, server_info,
2700                                                   strlen(server_info));
2701   else
2702     packet = silc_command_reply_payload_encode_va(SILC_COMMAND_INFO,
2703                                                   SILC_STATUS_OK, ident, 2,
2704                                                   2, idp->data, idp->len,
2705                                                   3, server_name,
2706                                                   strlen(server_name));
2707   silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0,
2708                           packet->data, packet->len, FALSE);
2709
2710   silc_buffer_free(packet);
2711   silc_buffer_free(idp);
2712
2713  out:
2714   silc_server_command_free(cmd);
2715 }
2716
2717 /* Server side of command PING. This just replies to the ping. */
2718
2719 SILC_SERVER_CMD_FUNC(ping)
2720 {
2721   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
2722   SilcServer server = cmd->server;
2723   SilcServerID *id;
2724   uint32 len;
2725   unsigned char *tmp;
2726
2727   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_INFO, cmd, 1, 2);
2728
2729   /* Get Server ID */
2730   tmp = silc_argument_get_arg_type(cmd->args, 1, &len);
2731   if (!tmp) {
2732     silc_server_command_send_status_reply(cmd, SILC_COMMAND_PING,
2733                                           SILC_STATUS_ERR_NO_SERVER_ID);
2734     goto out;
2735   }
2736   id = silc_id_str2id(tmp, len, SILC_ID_SERVER);
2737   if (!id)
2738     goto out;
2739
2740   if (SILC_ID_SERVER_COMPARE(id, server->id)) {
2741     /* Send our reply */
2742     silc_server_command_send_status_reply(cmd, SILC_COMMAND_PING,
2743                                           SILC_STATUS_OK);
2744   } else {
2745     silc_server_command_send_status_reply(cmd, SILC_COMMAND_PING,
2746                                           SILC_STATUS_ERR_NO_SUCH_SERVER);
2747     goto out;
2748   }
2749
2750   silc_free(id);
2751
2752  out:
2753   silc_server_command_free(cmd);
2754 }
2755
2756 /* Internal routine to join channel. The channel sent to this function
2757    has been either created or resolved from ID lists. This joins the sent
2758    client to the channel. */
2759
2760 static void silc_server_command_join_channel(SilcServer server,
2761                                              SilcServerCommandContext cmd,
2762                                              SilcChannelEntry channel,
2763                                              SilcClientID *client_id,
2764                                              int created,
2765                                              uint32 umode)
2766 {
2767   SilcSocketConnection sock = cmd->sock;
2768   unsigned char *tmp;
2769   uint32 tmp_len, user_count;
2770   unsigned char *passphrase = NULL, mode[4], tmp2[4], tmp3[4];
2771   SilcClientEntry client;
2772   SilcChannelClientEntry chl;
2773   SilcBuffer reply, chidp, clidp, keyp = NULL, user_list, mode_list;
2774   uint16 ident = silc_command_get_ident(cmd->payload);
2775   char check[512], check2[512];
2776
2777   SILC_LOG_DEBUG(("Start"));
2778
2779   if (!channel)
2780     return;
2781
2782   /* Get the client entry */
2783   if (cmd->sock->type == SILC_SOCKET_TYPE_CLIENT) {
2784     client = (SilcClientEntry)sock->user_data;
2785   } else {
2786     client = silc_server_get_client_resolve(server, client_id);
2787     if (!client) {
2788       if (cmd->pending)
2789         goto out;
2790
2791       /* The client info is being resolved. Reprocess this packet after
2792          receiving the reply to the query. */
2793       silc_server_command_pending(server, SILC_COMMAND_WHOIS,
2794                                   server->cmd_ident, NULL,
2795                                   silc_server_command_join,
2796                                   silc_server_command_dup(cmd));
2797       cmd->pending = TRUE;
2798       return;
2799     }
2800
2801     cmd->pending = FALSE;
2802   }
2803
2804   /*
2805    * Check channel modes
2806    */
2807
2808   memset(check, 0, sizeof(check));
2809   memset(check2, 0, sizeof(check2));
2810   strncat(check, client->nickname, strlen(client->nickname));
2811   strncat(check, "!", 1);
2812   strncat(check, client->username, strlen(client->username));
2813   if (!strchr(client->username, '@')) {
2814     strncat(check, "@", 1);
2815     strncat(check, cmd->sock->hostname, strlen(cmd->sock->hostname));
2816   }
2817
2818   strncat(check2, client->nickname, strlen(client->nickname));
2819   if (!strchr(client->nickname, '@')) {
2820     strncat(check2, "@", 1);
2821     strncat(check2, server->server_name, strlen(server->server_name));
2822   }
2823   strncat(check2, "!", 1);
2824   strncat(check2, client->username, strlen(client->username));
2825   if (!strchr(client->username, '@')) {
2826     strncat(check2, "@", 1);
2827     strncat(check2, cmd->sock->hostname, strlen(cmd->sock->hostname));
2828   }
2829
2830   /* Check invite list if channel is invite-only channel */
2831   if (channel->mode & SILC_CHANNEL_MODE_INVITE) {
2832     if (!channel->invite_list ||
2833         (!silc_string_match(channel->invite_list, check) &&
2834          !silc_string_match(channel->invite_list, check2))) {
2835       silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
2836                                             SILC_STATUS_ERR_NOT_INVITED);
2837       goto out;
2838     }
2839   }
2840
2841   /* Check ban list if it exists. If the client's nickname, server,
2842      username and/or hostname is in the ban list the access to the
2843      channel is denied. */
2844   if (channel->ban_list) {
2845     if (silc_string_match(channel->ban_list, check) ||
2846         silc_string_match(channel->ban_list, check2)) {
2847       silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
2848                               SILC_STATUS_ERR_BANNED_FROM_CHANNEL);
2849       goto out;
2850     }
2851   }
2852
2853   /* Get passphrase */
2854   tmp = silc_argument_get_arg_type(cmd->args, 3, &tmp_len);
2855   if (tmp) {
2856     passphrase = silc_calloc(tmp_len, sizeof(*passphrase));
2857     memcpy(passphrase, tmp, tmp_len);
2858   }
2859
2860   /* Check the channel passphrase if set. */
2861   if (channel->mode & SILC_CHANNEL_MODE_PASSPHRASE) {
2862     if (!passphrase || memcmp(channel->passphrase, passphrase,
2863                               strlen(channel->passphrase))) {
2864       silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
2865                                             SILC_STATUS_ERR_BAD_PASSWORD);
2866       goto out;
2867     }
2868   }
2869
2870   /* Check user count limit if set. */
2871   if (channel->mode & SILC_CHANNEL_MODE_ULIMIT) {
2872     if (silc_hash_table_count(channel->user_list) + 1 >
2873         channel->user_limit) {
2874       silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
2875                                             SILC_STATUS_ERR_CHANNEL_IS_FULL);
2876       goto out;
2877     }
2878   }
2879
2880   /*
2881    * Client is allowed to join to the channel. Make it happen.
2882    */
2883
2884   /* Check whether the client already is on the channel */
2885   if (silc_server_client_on_channel(client, channel)) {
2886     silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
2887                                           SILC_STATUS_ERR_USER_ON_CHANNEL);
2888     goto out;
2889   }
2890
2891   /* Generate new channel key as protocol dictates */
2892   if ((!created && silc_hash_table_count(channel->user_list) > 0) ||
2893       !channel->channel_key)
2894     if (!silc_server_create_channel_key(server, channel, 0))
2895       goto out;
2896
2897   /* Send the channel key. This is broadcasted to the channel but is not
2898      sent to the client who is joining to the channel. */
2899   if (!(channel->mode & SILC_CHANNEL_MODE_PRIVKEY))
2900     silc_server_send_channel_key(server, NULL, channel,
2901                                  server->server_type == SILC_ROUTER ?
2902                                  FALSE : !server->standalone);
2903
2904   /* Join the client to the channel by adding it to channel's user list.
2905      Add also the channel to client entry's channels list for fast cross-
2906      referencing. */
2907   chl = silc_calloc(1, sizeof(*chl));
2908   chl->mode = umode;
2909   chl->client = client;
2910   chl->channel = channel;
2911   silc_hash_table_add(channel->user_list, client, chl);
2912   silc_hash_table_add(client->channels, channel, chl);
2913
2914   /* Get users on the channel */
2915   silc_server_get_users_on_channel(server, channel, &user_list, &mode_list,
2916                                    &user_count);
2917
2918   /* Encode Client ID Payload of the original client who wants to join */
2919   clidp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
2920
2921   /* Encode command reply packet */
2922   chidp = silc_id_payload_encode(channel->id, SILC_ID_CHANNEL);
2923   SILC_PUT32_MSB(channel->mode, mode);
2924   SILC_PUT32_MSB(created, tmp2);
2925   SILC_PUT32_MSB(user_count, tmp3);
2926
2927   if (!(channel->mode & SILC_CHANNEL_MODE_PRIVKEY)) {
2928     tmp = silc_id_id2str(channel->id, SILC_ID_CHANNEL);
2929     keyp = silc_channel_key_payload_encode(SILC_ID_CHANNEL_LEN, tmp,
2930                                            strlen(channel->channel_key->
2931                                                   cipher->name),
2932                                            channel->channel_key->cipher->name,
2933                                            channel->key_len / 8, channel->key);
2934     silc_free(tmp);
2935   }
2936
2937   reply =
2938     silc_command_reply_payload_encode_va(SILC_COMMAND_JOIN,
2939                                          SILC_STATUS_OK, ident, 13,
2940                                          2, channel->channel_name,
2941                                          strlen(channel->channel_name),
2942                                          3, chidp->data, chidp->len,
2943                                          4, clidp->data, clidp->len,
2944                                          5, mode, 4,
2945                                          6, tmp2, 4,
2946                                          7, keyp ? keyp->data : NULL,
2947                                          keyp ? keyp->len : 0,
2948                                          8, channel->ban_list,
2949                                          channel->ban_list ?
2950                                          strlen(channel->ban_list) : 0,
2951                                          9, channel->invite_list,
2952                                          channel->invite_list ?
2953                                          strlen(channel->invite_list) : 0,
2954                                          10, channel->topic,
2955                                          channel->topic ?
2956                                          strlen(channel->topic) : 0,
2957                                          11, channel->hmac->hmac->name,
2958                                          strlen(channel->hmac->hmac->name),
2959                                          12, tmp3, 4,
2960                                          13, user_list->data, user_list->len,
2961                                          14, mode_list->data,
2962                                          mode_list->len);
2963
2964   /* Send command reply */
2965   silc_server_packet_send(server, sock, SILC_PACKET_COMMAND_REPLY, 0,
2966                           reply->data, reply->len, FALSE);
2967
2968   if (!cmd->pending) {
2969     /* Send JOIN notify to locally connected clients on the channel */
2970     silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
2971                                        SILC_NOTIFY_TYPE_JOIN, 2,
2972                                        clidp->data, clidp->len,
2973                                        chidp->data, chidp->len);
2974
2975     /* Send JOIN notify packet to our primary router */
2976     if (!server->standalone)
2977       silc_server_send_notify_join(server, server->router->connection,
2978                                    server->server_type == SILC_ROUTER ?
2979                                    TRUE : FALSE, channel, client->id);
2980   }
2981
2982   silc_buffer_free(reply);
2983   silc_buffer_free(clidp);
2984   silc_buffer_free(chidp);
2985   silc_buffer_free(keyp);
2986   silc_buffer_free(user_list);
2987   silc_buffer_free(mode_list);
2988
2989  out:
2990   if (passphrase)
2991     silc_free(passphrase);
2992 }
2993
2994 /* Server side of command JOIN. Joins client into requested channel. If
2995    the channel does not exist it will be created. */
2996
2997 SILC_SERVER_CMD_FUNC(join)
2998 {
2999   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
3000   SilcServer server = cmd->server;
3001   uint32 tmp_len;
3002   char *tmp, *channel_name = NULL, *cipher, *hmac;
3003   SilcChannelEntry channel;
3004   uint32 umode = 0;
3005   int created = FALSE;
3006   SilcClientID *client_id;
3007
3008   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_JOIN, cmd, 1, 4);
3009
3010   /* Get channel name */
3011   tmp = silc_argument_get_arg_type(cmd->args, 1, &tmp_len);
3012   if (!tmp) {
3013     silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
3014                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
3015     goto out;
3016   }
3017   channel_name = tmp;
3018
3019   if (strlen(channel_name) > 256)
3020     channel_name[255] = '\0';
3021
3022   if (silc_server_command_bad_chars(channel_name) == TRUE) {
3023     silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
3024                                           SILC_STATUS_ERR_BAD_CHANNEL);
3025     goto out;
3026   }
3027
3028   /* Get Client ID of the client who is joining to the channel */
3029   tmp = silc_argument_get_arg_type(cmd->args, 2, &tmp_len);
3030   if (!tmp) {
3031     silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
3032                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
3033     goto out;
3034   }
3035   client_id = silc_id_payload_parse_id(tmp, tmp_len);
3036   if (!client_id) {
3037     silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
3038                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
3039     goto out;
3040   }
3041
3042   /* Get cipher and hmac name */
3043   cipher = silc_argument_get_arg_type(cmd->args, 4, NULL);
3044   hmac = silc_argument_get_arg_type(cmd->args, 5, NULL);
3045
3046   /* See if the channel exists */
3047   channel = silc_idlist_find_channel_by_name(server->local_list,
3048                                              channel_name, NULL);
3049
3050   if (cmd->sock->type == SILC_SOCKET_TYPE_CLIENT) {
3051     /* If this is coming from client the Client ID in the command packet must
3052        be same as the client's ID. */
3053     if (cmd->sock->type == SILC_SOCKET_TYPE_CLIENT) {
3054       SilcClientEntry entry = (SilcClientEntry)cmd->sock->user_data;
3055       if (!SILC_ID_CLIENT_COMPARE(entry->id, client_id)) {
3056         silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
3057                                         SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
3058         goto out;
3059       }
3060     }
3061
3062     if (!channel || !channel->id) {
3063       /* Channel not found */
3064
3065       /* If we are standalone server we don't have a router, we just create
3066          the channel by ourselves. */
3067       if (server->standalone) {
3068         channel = silc_server_create_new_channel(server, server->id, cipher,
3069                                                  hmac, channel_name, TRUE);
3070         if (!channel) {
3071           silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
3072                                      SILC_STATUS_ERR_UNKNOWN_ALGORITHM);
3073           goto out;
3074         }
3075
3076         umode = (SILC_CHANNEL_UMODE_CHANOP | SILC_CHANNEL_UMODE_CHANFO);
3077         created = TRUE;
3078
3079       } else {
3080
3081         /* The channel does not exist on our server. If we are normal server
3082            we will send JOIN command to our router which will handle the
3083            joining procedure (either creates the channel if it doesn't exist
3084            or joins the client to it). */
3085         if (server->server_type == SILC_SERVER) {
3086           SilcBuffer tmpbuf;
3087           uint16 old_ident;
3088
3089           /* If this is pending command callback then we've resolved
3090              it and it didn't work, return since we've notified the
3091              client already in the command reply callback. */
3092           if (cmd->pending)
3093             goto out;
3094
3095           old_ident = silc_command_get_ident(cmd->payload);
3096           silc_command_set_ident(cmd->payload, silc_rng_get_rn16(server->rng));
3097           tmpbuf = silc_command_payload_encode_payload(cmd->payload);
3098
3099           /* Send JOIN command to our router */
3100           silc_server_packet_send(server, (SilcSocketConnection)
3101                                   server->router->connection,
3102                                   SILC_PACKET_COMMAND, cmd->packet->flags,
3103                                   tmpbuf->data, tmpbuf->len, TRUE);
3104
3105           /* Reprocess this packet after received reply from router */
3106           silc_server_command_pending(server, SILC_COMMAND_JOIN,
3107                                       silc_command_get_ident(cmd->payload),
3108                                       silc_server_command_destructor,
3109                                       silc_server_command_join,
3110                                       silc_server_command_dup(cmd));
3111           cmd->pending = TRUE;
3112           return;
3113         }
3114
3115         /* We are router and the channel does not seem exist so we will check
3116            our global list as well for the channel. */
3117         channel = silc_idlist_find_channel_by_name(server->global_list,
3118                                                    channel_name, NULL);
3119         if (!channel) {
3120           /* Channel really does not exist, create it */
3121           channel = silc_server_create_new_channel(server, server->id, cipher,
3122                                                    hmac, channel_name, TRUE);
3123           if (!channel) {
3124             silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
3125                                        SILC_STATUS_ERR_UNKNOWN_ALGORITHM);
3126             goto out;
3127           }
3128
3129           umode = (SILC_CHANNEL_UMODE_CHANOP | SILC_CHANNEL_UMODE_CHANFO);
3130           created = TRUE;
3131         }
3132       }
3133     }
3134   } else {
3135     if (!channel) {
3136       /* Channel not found */
3137
3138       /* If the command came from router and/or we are normal server then
3139          something went wrong with the joining as the channel was not found.
3140          We can't do anything else but ignore this. */
3141       if (cmd->sock->type == SILC_SOCKET_TYPE_ROUTER ||
3142           server->server_type == SILC_SERVER)
3143         goto out;
3144
3145       /* We are router and the channel does not seem exist so we will check
3146          our global list as well for the channel. */
3147       channel = silc_idlist_find_channel_by_name(server->global_list,
3148                                                  channel_name, NULL);
3149       if (!channel) {
3150         /* Channel really does not exist, create it */
3151         channel = silc_server_create_new_channel(server, server->id, cipher,
3152                                                  hmac, channel_name, TRUE);
3153         if (!channel) {
3154           silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
3155                                        SILC_STATUS_ERR_UNKNOWN_ALGORITHM);
3156           goto out;
3157         }
3158
3159         umode = (SILC_CHANNEL_UMODE_CHANOP | SILC_CHANNEL_UMODE_CHANFO);
3160         created = TRUE;
3161       }
3162     }
3163   }
3164
3165   /* If the channel does not have global users and is also empty it means the
3166      channel was created globally (by our router) and the client will be the
3167      channel founder and operator. */
3168   if (!channel->global_users && !silc_hash_table_count(channel->user_list)) {
3169     umode = (SILC_CHANNEL_UMODE_CHANOP | SILC_CHANNEL_UMODE_CHANFO);
3170     created = TRUE;             /* Created globally by our router */
3171   }
3172
3173   /* Join to the channel */
3174   silc_server_command_join_channel(server, cmd, channel, client_id,
3175                                    created, umode);
3176
3177   silc_free(client_id);
3178
3179  out:
3180   silc_server_command_free(cmd);
3181 }
3182
3183 /* Server side of command MOTD. Sends server's current "message of the
3184    day" to the client. */
3185
3186 SILC_SERVER_CMD_FUNC(motd)
3187 {
3188   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
3189   SilcServer server = cmd->server;
3190   SilcBuffer packet, idp;
3191   char *motd, *dest_server;
3192   uint32 motd_len;
3193   uint16 ident = silc_command_get_ident(cmd->payload);
3194
3195   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_MOTD, cmd, 1, 1);
3196
3197   /* Get server name */
3198   dest_server = silc_argument_get_arg_type(cmd->args, 1, NULL);
3199   if (!dest_server) {
3200     silc_server_command_send_status_reply(cmd, SILC_COMMAND_MOTD,
3201                                           SILC_STATUS_ERR_NO_SUCH_SERVER);
3202     goto out;
3203   }
3204
3205   if (!strncasecmp(dest_server, server->server_name, strlen(dest_server))) {
3206     /* Send our MOTD */
3207
3208     idp = silc_id_payload_encode(server->id_entry->id, SILC_ID_SERVER);
3209
3210     if (server->config && server->config->motd &&
3211         server->config->motd->motd_file) {
3212       /* Send motd */
3213       motd = silc_file_read(server->config->motd->motd_file, &motd_len);
3214       if (!motd)
3215         goto out;
3216
3217       motd[motd_len] = 0;
3218       packet = silc_command_reply_payload_encode_va(SILC_COMMAND_MOTD,
3219                                                     SILC_STATUS_OK, ident, 2,
3220                                                     2, idp, idp->len,
3221                                                     3, motd, motd_len);
3222       goto out;
3223     } else {
3224       /* No motd */
3225       packet = silc_command_reply_payload_encode_va(SILC_COMMAND_MOTD,
3226                                                     SILC_STATUS_OK, ident, 1,
3227                                                     2, idp, idp->len);
3228     }
3229
3230     silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0,
3231                             packet->data, packet->len, FALSE);
3232     silc_buffer_free(packet);
3233     silc_buffer_free(idp);
3234   } else {
3235     SilcServerEntry entry;
3236
3237     /* Check whether we have this server cached */
3238     entry = silc_idlist_find_server_by_name(server->global_list,
3239                                             dest_server, TRUE, NULL);
3240     if (!entry) {
3241       entry = silc_idlist_find_server_by_name(server->local_list,
3242                                               dest_server, TRUE, NULL);
3243     }
3244
3245     if (server->server_type == SILC_ROUTER && !cmd->pending &&
3246         entry && !entry->motd) {
3247       /* Send to the server */
3248       SilcBuffer tmpbuf;
3249       uint16 old_ident;
3250
3251       old_ident = silc_command_get_ident(cmd->payload);
3252       silc_command_set_ident(cmd->payload, silc_rng_get_rn16(server->rng));
3253       tmpbuf = silc_command_payload_encode_payload(cmd->payload);
3254
3255       silc_server_packet_send(server, entry->connection,
3256                               SILC_PACKET_COMMAND, cmd->packet->flags,
3257                               tmpbuf->data, tmpbuf->len, TRUE);
3258
3259       /* Reprocess this packet after received reply from router */
3260       silc_server_command_pending(server, SILC_COMMAND_MOTD,
3261                                   silc_command_get_ident(cmd->payload),
3262                                   silc_server_command_destructor,
3263                                   silc_server_command_motd,
3264                                   silc_server_command_dup(cmd));
3265       cmd->pending = TRUE;
3266       silc_command_set_ident(cmd->payload, old_ident);
3267       silc_buffer_free(tmpbuf);
3268       return;
3269     }
3270
3271     if (!entry && !cmd->pending && !server->standalone) {
3272       /* Send to the primary router */
3273       SilcBuffer tmpbuf;
3274       uint16 old_ident;
3275
3276       old_ident = silc_command_get_ident(cmd->payload);
3277       silc_command_set_ident(cmd->payload, silc_rng_get_rn16(server->rng));
3278       tmpbuf = silc_command_payload_encode_payload(cmd->payload);
3279
3280       silc_server_packet_send(server, server->router->connection,
3281                               SILC_PACKET_COMMAND, cmd->packet->flags,
3282                               tmpbuf->data, tmpbuf->len, TRUE);
3283
3284       /* Reprocess this packet after received reply from router */
3285       silc_server_command_pending(server, SILC_COMMAND_MOTD,
3286                                   silc_command_get_ident(cmd->payload),
3287                                   silc_server_command_destructor,
3288                                   silc_server_command_motd,
3289                                   silc_server_command_dup(cmd));
3290       cmd->pending = TRUE;
3291       silc_command_set_ident(cmd->payload, old_ident);
3292       silc_buffer_free(tmpbuf);
3293       return;
3294     }
3295
3296     if (!entry) {
3297       silc_server_command_send_status_reply(cmd, SILC_COMMAND_INFO,
3298                                             SILC_STATUS_ERR_NO_SUCH_SERVER);
3299       goto out;
3300     }
3301
3302     idp = silc_id_payload_encode(server->id_entry->id, SILC_ID_SERVER);
3303
3304     if (entry->motd)
3305       packet = silc_command_reply_payload_encode_va(SILC_COMMAND_MOTD,
3306                                                     SILC_STATUS_OK, ident, 2,
3307                                                     2, idp, idp->len,
3308                                                     3, entry->motd,
3309                                                     strlen(entry->motd));
3310     else
3311       packet = silc_command_reply_payload_encode_va(SILC_COMMAND_MOTD,
3312                                                     SILC_STATUS_OK, ident, 1,
3313                                                     2, idp, idp->len);
3314
3315     silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0,
3316                             packet->data, packet->len, FALSE);
3317     silc_buffer_free(packet);
3318     silc_buffer_free(idp);
3319   }
3320
3321  out:
3322   silc_server_command_free(cmd);
3323 }
3324
3325 /* Server side of command UMODE. Client can use this command to set/unset
3326    user mode. Client actually cannot set itself to be as server/router
3327    operator so this can be used only to unset the modes. */
3328
3329 SILC_SERVER_CMD_FUNC(umode)
3330 {
3331   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
3332   SilcServer server = cmd->server;
3333   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
3334   SilcBuffer packet;
3335   unsigned char *tmp_mask;
3336   uint32 mask;
3337   uint16 ident = silc_command_get_ident(cmd->payload);
3338
3339   if (cmd->sock->type != SILC_SOCKET_TYPE_CLIENT)
3340     goto out;
3341
3342   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_UMODE, cmd, 2, 2);
3343
3344   /* Get the client's mode mask */
3345   tmp_mask = silc_argument_get_arg_type(cmd->args, 2, NULL);
3346   if (!tmp_mask) {
3347     silc_server_command_send_status_reply(cmd, SILC_COMMAND_UMODE,
3348                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
3349     goto out;
3350   }
3351   SILC_GET32_MSB(mask, tmp_mask);
3352
3353   /*
3354    * Change the mode
3355    */
3356
3357   if (mask & SILC_UMODE_SERVER_OPERATOR) {
3358     if (!(client->mode & SILC_UMODE_SERVER_OPERATOR)) {
3359       /* Cannot operator mode */
3360       silc_server_command_send_status_reply(cmd, SILC_COMMAND_UMODE,
3361                                             SILC_STATUS_ERR_PERM_DENIED);
3362       goto out;
3363     }
3364   } else {
3365     if (client->mode & SILC_UMODE_SERVER_OPERATOR)
3366       /* Remove the server operator rights */
3367       client->mode &= ~SILC_UMODE_SERVER_OPERATOR;
3368   }
3369
3370   if (mask & SILC_UMODE_ROUTER_OPERATOR) {
3371     if (!(client->mode & SILC_UMODE_ROUTER_OPERATOR)) {
3372       /* Cannot operator mode */
3373       silc_server_command_send_status_reply(cmd, SILC_COMMAND_UMODE,
3374                                             SILC_STATUS_ERR_PERM_DENIED);
3375       goto out;
3376     }
3377   } else {
3378     if (client->mode & SILC_UMODE_ROUTER_OPERATOR)
3379       /* Remove the router operator rights */
3380       client->mode &= ~SILC_UMODE_ROUTER_OPERATOR;
3381   }
3382
3383   if (mask & SILC_UMODE_GONE) {
3384     client->mode |= SILC_UMODE_GONE;
3385   } else {
3386     if (client->mode & SILC_UMODE_GONE)
3387       /* Remove the gone status */
3388       client->mode &= ~SILC_UMODE_GONE;
3389   }
3390
3391   /* Send UMODE change to primary router */
3392   if (!server->standalone)
3393     silc_server_send_notify_umode(server, server->router->connection, TRUE,
3394                                   client->id, client->mode);
3395
3396   /* Send command reply to sender */
3397   packet = silc_command_reply_payload_encode_va(SILC_COMMAND_UMODE,
3398                                                 SILC_STATUS_OK, ident, 1,
3399                                                 2, tmp_mask, 4);
3400   silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0,
3401                           packet->data, packet->len, FALSE);
3402   silc_buffer_free(packet);
3403
3404  out:
3405   silc_server_command_free(cmd);
3406 }
3407
3408 /* Checks that client has rights to add or remove channel modes. If any
3409    of the checks fails FALSE is returned. */
3410
3411 int silc_server_check_cmode_rights(SilcChannelEntry channel,
3412                                    SilcChannelClientEntry client,
3413                                    uint32 mode)
3414 {
3415   int is_op = client->mode & SILC_CHANNEL_UMODE_CHANOP;
3416   int is_fo = client->mode & SILC_CHANNEL_UMODE_CHANFO;
3417
3418   /* Check whether has rights to change anything */
3419   if (!is_op && !is_fo)
3420     return FALSE;
3421
3422   /* Check whether has rights to change everything */
3423   if (is_op && is_fo)
3424     return TRUE;
3425
3426   /* We know that client is channel operator, check that they are not
3427      changing anything that requires channel founder rights. Rest of the
3428      modes are available automatically for channel operator. */
3429
3430   if (mode & SILC_CHANNEL_MODE_PRIVKEY) {
3431     if (is_op && !is_fo)
3432       return FALSE;
3433   } else {
3434     if (channel->mode & SILC_CHANNEL_MODE_PRIVKEY) {
3435       if (is_op && !is_fo)
3436         return FALSE;
3437     }
3438   }
3439
3440   if (mode & SILC_CHANNEL_MODE_PASSPHRASE) {
3441     if (is_op && !is_fo)
3442       return FALSE;
3443   } else {
3444     if (channel->mode & SILC_CHANNEL_MODE_PASSPHRASE) {
3445       if (is_op && !is_fo)
3446         return FALSE;
3447     }
3448   }
3449
3450   if (mode & SILC_CHANNEL_MODE_CIPHER) {
3451     if (is_op && !is_fo)
3452       return FALSE;
3453   } else {
3454     if (channel->mode & SILC_CHANNEL_MODE_CIPHER) {
3455       if (is_op && !is_fo)
3456         return FALSE;
3457     }
3458   }
3459
3460   if (mode & SILC_CHANNEL_MODE_FOUNDER_AUTH) {
3461     if (is_op && !is_fo)
3462       return FALSE;
3463   } else {
3464     if (channel->mode & SILC_CHANNEL_MODE_FOUNDER_AUTH) {
3465       if (is_op && !is_fo)
3466         return FALSE;
3467     }
3468   }
3469
3470   return TRUE;
3471 }
3472
3473 /* Server side command of CMODE. Changes channel mode */
3474
3475 SILC_SERVER_CMD_FUNC(cmode)
3476 {
3477   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
3478   SilcServer server = cmd->server;
3479   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
3480   SilcIDListData idata = (SilcIDListData)client;
3481   SilcChannelID *channel_id;
3482   SilcChannelEntry channel;
3483   SilcChannelClientEntry chl;
3484   SilcBuffer packet, cidp;
3485   unsigned char *tmp, *tmp_id, *tmp_mask;
3486   char *cipher = NULL, *hmac = NULL;
3487   uint32 mode_mask, tmp_len, tmp_len2;
3488   uint16 ident = silc_command_get_ident(cmd->payload);
3489
3490   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_CMODE, cmd, 2, 7);
3491
3492   /* Get Channel ID */
3493   tmp_id = silc_argument_get_arg_type(cmd->args, 1, &tmp_len2);
3494   if (!tmp_id) {
3495     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3496                                           SILC_STATUS_ERR_NO_CHANNEL_ID);
3497     goto out;
3498   }
3499   channel_id = silc_id_payload_parse_id(tmp_id, tmp_len2);
3500   if (!channel_id) {
3501     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3502                                           SILC_STATUS_ERR_NO_CHANNEL_ID);
3503     goto out;
3504   }
3505
3506   /* Get the channel mode mask */
3507   tmp_mask = silc_argument_get_arg_type(cmd->args, 2, &tmp_len);
3508   if (!tmp_mask) {
3509     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3510                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
3511     goto out;
3512   }
3513   SILC_GET32_MSB(mode_mask, tmp_mask);
3514
3515   /* Get channel entry */
3516   channel = silc_idlist_find_channel_by_id(server->local_list,
3517                                            channel_id, NULL);
3518   if (!channel) {
3519     channel = silc_idlist_find_channel_by_id(server->global_list,
3520                                              channel_id, NULL);
3521     if (!channel) {
3522       silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3523                                             SILC_STATUS_ERR_NO_SUCH_CHANNEL);
3524       goto out;
3525     }
3526   }
3527
3528   /* Check whether this client is on the channel */
3529   if (!silc_server_client_on_channel(client, channel)) {
3530     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3531                                           SILC_STATUS_ERR_NOT_ON_CHANNEL);
3532     goto out;
3533   }
3534
3535   /* Get entry to the channel user list */
3536   silc_hash_table_find(channel->user_list, client, NULL, (void *)&chl);
3537
3538   /* Check that client has rights to change any requested channel modes */
3539   if (!silc_server_check_cmode_rights(channel, chl, mode_mask)) {
3540     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3541                                           SILC_STATUS_ERR_NO_CHANNEL_PRIV);
3542     goto out;
3543   }
3544
3545   /*
3546    * Check the modes. Modes that requires nothing special operation are
3547    * not checked here.
3548    */
3549
3550   if (mode_mask & SILC_CHANNEL_MODE_PRIVKEY) {
3551     /* Channel uses private keys to protect traffic. Client(s) has set the
3552        key locally they want to use, server does not know that key. */
3553     /* Nothing interesting to do here */
3554   } else {
3555     if (channel->mode & SILC_CHANNEL_MODE_PRIVKEY) {
3556       /* The mode is removed and we need to generate and distribute
3557          new channel key. Clients are not using private channel keys
3558          anymore after this. */
3559
3560       /* Re-generate channel key */
3561       if (!silc_server_create_channel_key(server, channel, 0))
3562         goto out;
3563
3564       /* Send the channel key. This sends it to our local clients and if
3565          we are normal server to our router as well. */
3566       silc_server_send_channel_key(server, NULL, channel,
3567                                    server->server_type == SILC_ROUTER ?
3568                                    FALSE : !server->standalone);
3569
3570       cipher = channel->channel_key->cipher->name;
3571       hmac = channel->hmac->hmac->name;
3572     }
3573   }
3574
3575   if (mode_mask & SILC_CHANNEL_MODE_ULIMIT) {
3576     /* User limit is set on channel */
3577     uint32 user_limit;
3578
3579     /* Get user limit */
3580     tmp = silc_argument_get_arg_type(cmd->args, 3, NULL);
3581     if (!tmp) {
3582       if (!(channel->mode & SILC_CHANNEL_MODE_ULIMIT)) {
3583         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3584                                    SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
3585         goto out;
3586       }
3587     } else {
3588       SILC_GET32_MSB(user_limit, tmp);
3589       channel->user_limit = user_limit;
3590     }
3591   } else {
3592     if (channel->mode & SILC_CHANNEL_MODE_ULIMIT)
3593       /* User limit mode is unset. Remove user limit */
3594       channel->user_limit = 0;
3595   }
3596
3597   if (mode_mask & SILC_CHANNEL_MODE_PASSPHRASE) {
3598     if (!(channel->mode & SILC_CHANNEL_MODE_PASSPHRASE)) {
3599       /* Passphrase has been set to channel */
3600
3601       /* Get the passphrase */
3602       tmp = silc_argument_get_arg_type(cmd->args, 4, NULL);
3603       if (!tmp) {
3604         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3605                                    SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
3606         goto out;
3607       }
3608
3609       /* Save the passphrase */
3610       channel->passphrase = strdup(tmp);
3611     }
3612   } else {
3613     if (channel->mode & SILC_CHANNEL_MODE_PASSPHRASE) {
3614       /* Passphrase mode is unset. remove the passphrase */
3615       if (channel->passphrase) {
3616         silc_free(channel->passphrase);
3617         channel->passphrase = NULL;
3618       }
3619     }
3620   }
3621
3622   if (mode_mask & SILC_CHANNEL_MODE_CIPHER) {
3623     if (!(channel->mode & SILC_CHANNEL_MODE_CIPHER)) {
3624       /* Cipher to use protect the traffic */
3625
3626       /* Get cipher */
3627       cipher = silc_argument_get_arg_type(cmd->args, 5, NULL);
3628       if (!cipher) {
3629         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3630                                    SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
3631         goto out;
3632       }
3633
3634       /* Delete old cipher and allocate the new one */
3635       silc_cipher_free(channel->channel_key);
3636       if (!silc_cipher_alloc(cipher, &channel->channel_key)) {
3637         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3638                                        SILC_STATUS_ERR_UNKNOWN_ALGORITHM);
3639         goto out;
3640       }
3641
3642       /* Re-generate channel key */
3643       if (!silc_server_create_channel_key(server, channel, 0))
3644         goto out;
3645
3646       /* Send the channel key. This sends it to our local clients and if
3647          we are normal server to our router as well. */
3648       silc_server_send_channel_key(server, NULL, channel,
3649                                    server->server_type == SILC_ROUTER ?
3650                                    FALSE : !server->standalone);
3651     }
3652   } else {
3653     if (channel->mode & SILC_CHANNEL_MODE_CIPHER) {
3654       /* Cipher mode is unset. Remove the cipher and revert back to
3655          default cipher */
3656       cipher = channel->cipher;
3657
3658       /* Delete old cipher and allocate default one */
3659       silc_cipher_free(channel->channel_key);
3660       if (!silc_cipher_alloc(cipher ? cipher : "aes-256-cbc",
3661                              &channel->channel_key)) {
3662         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3663                                    SILC_STATUS_ERR_UNKNOWN_ALGORITHM);
3664         goto out;
3665       }
3666
3667       /* Re-generate channel key */
3668       if (!silc_server_create_channel_key(server, channel, 0))
3669         goto out;
3670
3671       /* Send the channel key. This sends it to our local clients and if
3672          we are normal server to our router as well. */
3673       silc_server_send_channel_key(server, NULL, channel,
3674                                    server->server_type == SILC_ROUTER ?
3675                                    FALSE : !server->standalone);
3676     }
3677   }
3678
3679   if (mode_mask & SILC_CHANNEL_MODE_HMAC) {
3680     if (!(channel->mode & SILC_CHANNEL_MODE_HMAC)) {
3681       /* HMAC to use protect the traffic */
3682       unsigned char hash[32];
3683
3684       /* Get hmac */
3685       hmac = silc_argument_get_arg_type(cmd->args, 6, NULL);
3686       if (!hmac) {
3687         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3688                                    SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
3689         goto out;
3690       }
3691
3692       /* Delete old hmac and allocate the new one */
3693       silc_hmac_free(channel->hmac);
3694       if (!silc_hmac_alloc(hmac, NULL, &channel->hmac)) {
3695         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3696                                        SILC_STATUS_ERR_UNKNOWN_ALGORITHM);
3697         goto out;
3698       }
3699
3700       /* Set the HMAC key out of current channel key. The client must do
3701          this locally. */
3702       silc_hash_make(channel->hmac->hash, channel->key, channel->key_len / 8,
3703                      hash);
3704       silc_hmac_set_key(channel->hmac, hash,
3705                         silc_hash_len(channel->hmac->hash));
3706       memset(hash, 0, sizeof(hash));
3707     }
3708   } else {
3709     if (channel->mode & SILC_CHANNEL_MODE_HMAC) {
3710       /* Hmac mode is unset. Remove the hmac and revert back to
3711          default hmac */
3712       unsigned char hash[32];
3713       hmac = channel->hmac_name;
3714
3715       /* Delete old hmac and allocate default one */
3716       silc_hmac_free(channel->hmac);
3717       if (!silc_hmac_alloc(hmac ? hmac : "hmac-sha1-96", NULL,
3718                            &channel->hmac)) {
3719         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3720                                        SILC_STATUS_ERR_UNKNOWN_ALGORITHM);
3721         goto out;
3722       }
3723
3724       /* Set the HMAC key out of current channel key. The client must do
3725          this locally. */
3726       silc_hash_make(channel->hmac->hash, channel->key, channel->key_len / 8,
3727                      hash);
3728       silc_hmac_set_key(channel->hmac, hash,
3729                         silc_hash_len(channel->hmac->hash));
3730       memset(hash, 0, sizeof(hash));
3731     }
3732   }
3733
3734   if (mode_mask & SILC_CHANNEL_MODE_FOUNDER_AUTH) {
3735     if (chl->mode & SILC_CHANNEL_UMODE_CHANFO) {
3736       if (!(channel->mode & SILC_CHANNEL_MODE_FOUNDER_AUTH)) {
3737         /* Set the founder authentication */
3738         SilcAuthPayload auth;
3739
3740         tmp = silc_argument_get_arg_type(cmd->args, 7, &tmp_len);
3741         if (!tmp) {
3742           silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3743                                      SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
3744           goto out;
3745         }
3746
3747         auth = silc_auth_payload_parse(tmp, tmp_len);
3748         if (!auth) {
3749           silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3750                                      SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
3751           goto out;
3752         }
3753
3754         /* Save the public key */
3755         tmp = silc_pkcs_public_key_encode(idata->public_key, &tmp_len);
3756         silc_pkcs_public_key_decode(tmp, tmp_len, &channel->founder_key);
3757         silc_free(tmp);
3758
3759         channel->founder_method = silc_auth_get_method(auth);
3760
3761         if (channel->founder_method == SILC_AUTH_PASSWORD) {
3762           tmp = silc_auth_get_data(auth, &tmp_len);
3763           channel->founder_passwd =
3764             silc_calloc(tmp_len + 1, sizeof(*channel->founder_passwd));
3765           memcpy(channel->founder_passwd, tmp, tmp_len);
3766           channel->founder_passwd_len = tmp_len;
3767         } else {
3768           /* Verify the payload before setting the mode */
3769           if (!silc_auth_verify(auth, channel->founder_method,
3770                                 channel->founder_key, 0, idata->hash,
3771                                 client->id, SILC_ID_CLIENT)) {
3772             silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3773                                                   SILC_STATUS_ERR_AUTH_FAILED);
3774             goto out;
3775           }
3776         }
3777
3778         silc_auth_payload_free(auth);
3779       }
3780     }
3781   } else {
3782     if (chl->mode & SILC_CHANNEL_UMODE_CHANFO) {
3783       if (channel->mode & SILC_CHANNEL_MODE_FOUNDER_AUTH) {
3784         if (channel->founder_key)
3785           silc_pkcs_public_key_free(channel->founder_key);
3786         if (channel->founder_passwd) {
3787           silc_free(channel->founder_passwd);
3788           channel->founder_passwd = NULL;
3789         }
3790       }
3791     }
3792   }
3793
3794   /* Finally, set the mode */
3795   channel->mode = mode_mask;
3796
3797   /* Send CMODE_CHANGE notify */
3798   cidp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
3799   silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
3800                                      SILC_NOTIFY_TYPE_CMODE_CHANGE, 4,
3801                                      cidp->data, cidp->len,
3802                                      tmp_mask, 4,
3803                                      cipher, cipher ? strlen(cipher) : 0,
3804                                      hmac, hmac ? strlen(hmac) : 0);
3805
3806   /* Set CMODE notify type to network */
3807   if (!server->standalone)
3808     silc_server_send_notify_cmode(server, server->router->connection,
3809                                   server->server_type == SILC_ROUTER ?
3810                                   TRUE : FALSE, channel,
3811                                   mode_mask, client->id, SILC_ID_CLIENT,
3812                                   cipher, hmac);
3813
3814   /* Send command reply to sender */
3815   packet = silc_command_reply_payload_encode_va(SILC_COMMAND_CMODE,
3816                                                 SILC_STATUS_OK, ident, 2,
3817                                                 2, tmp_id, tmp_len2,
3818                                                 3, tmp_mask, 4);
3819   silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0,
3820                           packet->data, packet->len, FALSE);
3821
3822   silc_buffer_free(packet);
3823   silc_free(channel_id);
3824   silc_free(cidp);
3825
3826  out:
3827   silc_server_command_free(cmd);
3828 }
3829
3830 /* Server side of CUMODE command. Changes client's mode on a channel. */
3831
3832 SILC_SERVER_CMD_FUNC(cumode)
3833 {
3834   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
3835   SilcServer server = cmd->server;
3836   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
3837   SilcIDListData idata = (SilcIDListData)client;
3838   SilcChannelID *channel_id;
3839   SilcClientID *client_id;
3840   SilcChannelEntry channel;
3841   SilcClientEntry target_client;
3842   SilcChannelClientEntry chl;
3843   SilcBuffer packet, idp;
3844   unsigned char *tmp_id, *tmp_ch_id, *tmp_mask;
3845   uint32 target_mask, sender_mask = 0, tmp_len, tmp_ch_len;
3846   int notify = FALSE;
3847   uint16 ident = silc_command_get_ident(cmd->payload);
3848
3849   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_CUMODE, cmd, 3, 4);
3850
3851   /* Get Channel ID */
3852   tmp_ch_id = silc_argument_get_arg_type(cmd->args, 1, &tmp_ch_len);
3853   if (!tmp_ch_id) {
3854     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3855                                           SILC_STATUS_ERR_NO_CHANNEL_ID);
3856     goto out;
3857   }
3858   channel_id = silc_id_payload_parse_id(tmp_ch_id, tmp_ch_len);
3859   if (!channel_id) {
3860     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3861                                           SILC_STATUS_ERR_NO_CHANNEL_ID);
3862     goto out;
3863   }
3864
3865   /* Get channel entry */
3866   channel = silc_idlist_find_channel_by_id(server->local_list,
3867                                            channel_id, NULL);
3868   if (!channel) {
3869     channel = silc_idlist_find_channel_by_id(server->global_list,
3870                                              channel_id, NULL);
3871     if (!channel) {
3872       silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3873                                             SILC_STATUS_ERR_NO_SUCH_CHANNEL);
3874       goto out;
3875     }
3876   }
3877
3878   /* Check whether sender is on the channel */
3879   if (!silc_server_client_on_channel(client, channel)) {
3880     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3881                                           SILC_STATUS_ERR_NOT_ON_CHANNEL);
3882     goto out;
3883   }
3884
3885   /* Check that client has rights to change other's rights */
3886   silc_hash_table_find(channel->user_list, client, NULL, (void *)&chl);
3887   sender_mask = chl->mode;
3888
3889   /* Get the target client's channel mode mask */
3890   tmp_mask = silc_argument_get_arg_type(cmd->args, 2, NULL);
3891   if (!tmp_mask) {
3892     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3893                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
3894     goto out;
3895   }
3896   SILC_GET32_MSB(target_mask, tmp_mask);
3897
3898   /* Get target Client ID */
3899   tmp_id = silc_argument_get_arg_type(cmd->args, 3, &tmp_len);
3900   if (!tmp_id) {
3901     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3902                                           SILC_STATUS_ERR_NO_CLIENT_ID);
3903     goto out;
3904   }
3905   client_id = silc_id_payload_parse_id(tmp_id, tmp_len);
3906   if (!client_id) {
3907     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3908                                           SILC_STATUS_ERR_NO_CLIENT_ID);
3909     goto out;
3910   }
3911
3912   /* Get target client's entry */
3913   target_client = silc_idlist_find_client_by_id(server->local_list,
3914                                                 client_id, TRUE, NULL);
3915   if (!target_client) {
3916     target_client = silc_idlist_find_client_by_id(server->global_list,
3917                                                   client_id, TRUE, NULL);
3918   }
3919
3920   if (target_client != client &&
3921       !(sender_mask & SILC_CHANNEL_UMODE_CHANFO) &&
3922       !(sender_mask & SILC_CHANNEL_UMODE_CHANOP)) {
3923     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3924                                           SILC_STATUS_ERR_NO_CHANNEL_PRIV);
3925     goto out;
3926   }
3927
3928   /* Check whether target client is on the channel */
3929   if (target_client != client) {
3930     if (!silc_server_client_on_channel(target_client, channel)) {
3931       silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3932                                  SILC_STATUS_ERR_USER_NOT_ON_CHANNEL);
3933       goto out;
3934     }
3935
3936     /* Get entry to the channel user list */
3937     silc_hash_table_find(channel->user_list, target_client, NULL,
3938                          (void *)&chl);
3939   }
3940
3941   /*
3942    * Change the mode
3943    */
3944
3945   /* If the target client is founder, no one else can change their mode
3946      but themselves. */
3947   if (chl->mode & SILC_CHANNEL_UMODE_CHANFO && chl->client != target_client) {
3948     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3949                                           SILC_STATUS_ERR_NOT_YOU);
3950     goto out;
3951   }
3952
3953   if (target_mask & SILC_CHANNEL_UMODE_CHANFO) {
3954     /* The client tries to claim the founder rights. */
3955     unsigned char *tmp_auth;
3956     uint32 tmp_auth_len, auth_len;
3957     void *auth;
3958
3959     if (target_client != client) {
3960       silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3961                                             SILC_STATUS_ERR_NOT_YOU);
3962       goto out;
3963     }
3964
3965     if (!(channel->mode & SILC_CHANNEL_MODE_FOUNDER_AUTH) ||
3966         !channel->founder_key) {
3967       silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3968                                             SILC_STATUS_ERR_NOT_YOU);
3969       goto out;
3970     }
3971
3972     tmp_auth = silc_argument_get_arg_type(cmd->args, 4, &tmp_auth_len);
3973     if (!tmp_auth) {
3974       silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3975                                             SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
3976       goto out;
3977     }
3978
3979     auth = (channel->founder_method == SILC_AUTH_PASSWORD ?
3980             (void *)channel->founder_passwd : (void *)channel->founder_key);
3981     auth_len = (channel->founder_method == SILC_AUTH_PASSWORD ?
3982                 channel->founder_passwd_len : 0);
3983
3984     if (!silc_auth_verify_data(tmp_auth, tmp_auth_len,
3985                                channel->founder_method, auth, auth_len,
3986                                idata->hash, client->id, SILC_ID_CLIENT)) {
3987       silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3988                                             SILC_STATUS_ERR_AUTH_FAILED);
3989       goto out;
3990     }
3991
3992     sender_mask = chl->mode |= SILC_CHANNEL_UMODE_CHANFO;
3993     notify = TRUE;
3994   } else {
3995     if (chl->mode & SILC_CHANNEL_UMODE_CHANFO) {
3996       if (target_client == client) {
3997         /* Remove channel founder rights from itself */
3998         chl->mode &= ~SILC_CHANNEL_UMODE_CHANFO;
3999         notify = TRUE;
4000       } else {
4001         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
4002                                               SILC_STATUS_ERR_NOT_YOU);
4003         goto out;
4004       }
4005     }
4006   }
4007
4008   if (target_mask & SILC_CHANNEL_UMODE_CHANOP) {
4009     /* Promote to operator */
4010     if (!(chl->mode & SILC_CHANNEL_UMODE_CHANOP)) {
4011       if (!(sender_mask & SILC_CHANNEL_UMODE_CHANOP) &&
4012           !(sender_mask & SILC_CHANNEL_UMODE_CHANFO)) {
4013         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
4014                                               SILC_STATUS_ERR_NO_CHANNEL_PRIV);
4015         goto out;
4016       }
4017
4018       chl->mode |= SILC_CHANNEL_UMODE_CHANOP;
4019       notify = TRUE;
4020     }
4021   } else {
4022     if (chl->mode & SILC_CHANNEL_UMODE_CHANOP) {
4023       if (!(sender_mask & SILC_CHANNEL_UMODE_CHANOP) &&
4024           !(sender_mask & SILC_CHANNEL_UMODE_CHANFO)) {
4025         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
4026                                               SILC_STATUS_ERR_NO_CHANNEL_PRIV);
4027         goto out;
4028       }
4029
4030       /* Demote to normal user */
4031       chl->mode &= ~SILC_CHANNEL_UMODE_CHANOP;
4032       notify = TRUE;
4033     }
4034   }
4035
4036   idp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
4037   tmp_id = silc_argument_get_arg_type(cmd->args, 3, &tmp_len);
4038
4039   /* Send notify to channel, notify only if mode was actually changed. */
4040   if (notify) {
4041     silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
4042                                        SILC_NOTIFY_TYPE_CUMODE_CHANGE, 3,
4043                                        idp->data, idp->len,
4044                                        tmp_mask, 4,
4045                                        tmp_id, tmp_len);
4046
4047     /* Set CUMODE notify type to network */
4048     if (!server->standalone)
4049       silc_server_send_notify_cumode(server, server->router->connection,
4050                                      server->server_type == SILC_ROUTER ?
4051                                      TRUE : FALSE, channel,
4052                                      target_mask, client->id,
4053                                      SILC_ID_CLIENT,
4054                                      target_client->id);
4055   }
4056
4057   /* Send command reply to sender */
4058   packet = silc_command_reply_payload_encode_va(SILC_COMMAND_CUMODE,
4059                                                 SILC_STATUS_OK, ident, 3,
4060                                                 2, tmp_mask, 4,
4061                                                 3, tmp_ch_id, tmp_ch_len,
4062                                                 4, tmp_id, tmp_len);
4063   silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0,
4064                           packet->data, packet->len, FALSE);
4065
4066   silc_buffer_free(packet);
4067   silc_free(channel_id);
4068   silc_free(client_id);
4069   silc_buffer_free(idp);
4070
4071  out:
4072   silc_server_command_free(cmd);
4073 }
4074
4075 /* Server side of KICK command. Kicks client out of channel. */
4076
4077 SILC_SERVER_CMD_FUNC(kick)
4078 {
4079   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
4080   SilcServer server = cmd->server;
4081   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
4082   SilcClientEntry target_client;
4083   SilcChannelID *channel_id;
4084   SilcClientID *client_id;
4085   SilcChannelEntry channel;
4086   SilcChannelClientEntry chl;
4087   SilcBuffer idp;
4088   uint32 tmp_len;
4089   unsigned char *tmp, *comment;
4090
4091   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_LEAVE, cmd, 1, 3);
4092
4093   /* Get Channel ID */
4094   tmp = silc_argument_get_arg_type(cmd->args, 1, &tmp_len);
4095   if (!tmp) {
4096     silc_server_command_send_status_reply(cmd, SILC_COMMAND_KICK,
4097                                           SILC_STATUS_ERR_NO_CHANNEL_ID);
4098     goto out;
4099   }
4100   channel_id = silc_id_payload_parse_id(tmp, tmp_len);
4101   if (!channel_id) {
4102     silc_server_command_send_status_reply(cmd, SILC_COMMAND_KICK,
4103                                           SILC_STATUS_ERR_NO_CHANNEL_ID);
4104     goto out;
4105   }
4106
4107   /* Get channel entry */
4108   channel = silc_idlist_find_channel_by_id(server->local_list,
4109                                            channel_id, NULL);
4110   if (!channel) {
4111     channel = silc_idlist_find_channel_by_id(server->local_list,
4112                                              channel_id, NULL);
4113     if (!channel) {
4114       silc_server_command_send_status_reply(cmd, SILC_COMMAND_KICK,
4115                                             SILC_STATUS_ERR_NO_SUCH_CHANNEL);
4116       goto out;
4117     }
4118   }
4119
4120   /* Check whether sender is on the channel */
4121   if (!silc_server_client_on_channel(client, channel)) {
4122     silc_server_command_send_status_reply(cmd, SILC_COMMAND_KICK,
4123                                           SILC_STATUS_ERR_NOT_ON_CHANNEL);
4124     goto out;
4125   }
4126
4127   /* Check that the kicker is channel operator or channel founder */
4128   silc_hash_table_find(channel->user_list, client, NULL, (void *)&chl);
4129   if (chl->mode == SILC_CHANNEL_UMODE_NONE) {
4130     silc_server_command_send_status_reply(cmd, SILC_COMMAND_KICK,
4131                                           SILC_STATUS_ERR_NO_CHANNEL_PRIV);
4132     goto out;
4133   }
4134
4135   /* Get target Client ID */
4136   tmp = silc_argument_get_arg_type(cmd->args, 2, &tmp_len);
4137   if (!tmp) {
4138     silc_server_command_send_status_reply(cmd, SILC_COMMAND_KICK,
4139                                           SILC_STATUS_ERR_NO_CLIENT_ID);
4140     goto out;
4141   }
4142   client_id = silc_id_payload_parse_id(tmp, tmp_len);
4143   if (!client_id) {
4144     silc_server_command_send_status_reply(cmd, SILC_COMMAND_KICK,
4145                                           SILC_STATUS_ERR_NO_CLIENT_ID);
4146     goto out;
4147   }
4148
4149   /* Get target client's entry */
4150   target_client = silc_idlist_find_client_by_id(server->local_list,
4151                                                 client_id, TRUE, NULL);
4152   if (!target_client) {
4153     target_client = silc_idlist_find_client_by_id(server->global_list,
4154                                                   client_id, TRUE, NULL);
4155   }
4156
4157   /* Check that the target client is not channel founder. Channel founder
4158      cannot be kicked from the channel. */
4159   silc_hash_table_find(channel->user_list, target_client, NULL, (void *)&chl);
4160   if (chl->mode & SILC_CHANNEL_UMODE_CHANFO) {
4161     silc_server_command_send_status_reply(cmd, SILC_COMMAND_KICK,
4162                                           SILC_STATUS_ERR_NO_CHANNEL_FOPRIV);
4163     goto out;
4164   }
4165
4166   /* Check whether target client is on the channel */
4167   if (!silc_server_client_on_channel(target_client, channel)) {
4168     silc_server_command_send_status_reply(cmd, SILC_COMMAND_KICK,
4169                                           SILC_STATUS_ERR_USER_NOT_ON_CHANNEL);
4170     goto out;
4171   }
4172
4173   /* Get comment */
4174   tmp_len = 0;
4175   comment = silc_argument_get_arg_type(cmd->args, 3, &tmp_len);
4176   if (tmp_len > 128)
4177     comment = NULL;
4178
4179   /* Send command reply to sender */
4180   silc_server_command_send_status_reply(cmd, SILC_COMMAND_KICK,
4181                                         SILC_STATUS_OK);
4182
4183   /* Send KICKED notify to local clients on the channel */
4184   idp = silc_id_payload_encode(target_client->id, SILC_ID_CLIENT);
4185   silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
4186                                      SILC_NOTIFY_TYPE_KICKED,
4187                                      comment ? 2 : 1,
4188                                      idp->data, idp->len,
4189                                      comment, comment ? strlen(comment) : 0);
4190   silc_buffer_free(idp);
4191
4192   /* Remove the client from the channel. If the channel does not exist
4193      after removing the client then the client kicked itself off the channel
4194      and we don't have to send anything after that. */
4195   if (!silc_server_remove_from_one_channel(server, NULL, channel,
4196                                            target_client, FALSE))
4197     goto out;
4198
4199   /* Send KICKED notify to primary route */
4200   if (!server->standalone)
4201     silc_server_send_notify_kicked(server, server->router->connection,
4202                                    server->server_type == SILC_ROUTER ?
4203                                    TRUE : FALSE, channel,
4204                                    target_client->id, comment);
4205
4206   if (!(channel->mode & SILC_CHANNEL_MODE_PRIVKEY)) {
4207     /* Re-generate channel key */
4208     if (!silc_server_create_channel_key(server, channel, 0))
4209       goto out;
4210
4211     /* Send the channel key to the channel. The key of course is not sent
4212        to the client who was kicked off the channel. */
4213     silc_server_send_channel_key(server, target_client->connection, channel,
4214                                  server->server_type == SILC_ROUTER ?
4215                                  FALSE : !server->standalone);
4216   }
4217
4218  out:
4219   silc_server_command_free(cmd);
4220 }
4221
4222 /* Server side of OPER command. Client uses this comand to obtain server
4223    operator privileges to this server/router. */
4224
4225 SILC_SERVER_CMD_FUNC(oper)
4226 {
4227   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
4228   SilcServer server = cmd->server;
4229   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
4230   unsigned char *username, *auth;
4231   uint32 tmp_len;
4232   SilcServerConfigSectionAdminConnection *admin;
4233   SilcIDListData idata = (SilcIDListData)client;
4234
4235   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_OPER, cmd, 1, 2);
4236
4237   if (!client || cmd->sock->type != SILC_SOCKET_TYPE_CLIENT)
4238     goto out;
4239
4240   /* Get the username */
4241   username = silc_argument_get_arg_type(cmd->args, 1, &tmp_len);
4242   if (!username) {
4243     silc_server_command_send_status_reply(cmd, SILC_COMMAND_OPER,
4244                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
4245     goto out;
4246   }
4247
4248   /* Get the admin configuration */
4249   admin = silc_server_config_find_admin(server->config, cmd->sock->ip,
4250                                         username, client->nickname);
4251   if (!admin) {
4252     admin = silc_server_config_find_admin(server->config, cmd->sock->hostname,
4253                                           username, client->nickname);
4254     if (!admin) {
4255       silc_server_command_send_status_reply(cmd, SILC_COMMAND_OPER,
4256                                             SILC_STATUS_ERR_AUTH_FAILED);
4257       goto out;
4258     }
4259   }
4260
4261   /* Get the authentication payload */
4262   auth = silc_argument_get_arg_type(cmd->args, 2, &tmp_len);
4263   if (!auth) {
4264     silc_server_command_send_status_reply(cmd, SILC_COMMAND_OPER,
4265                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
4266     goto out;
4267   }
4268
4269   /* Verify the authentication data */
4270   if (!silc_auth_verify_data(auth, tmp_len, admin->auth_meth,
4271                              admin->auth_data, admin->auth_data_len,
4272                              idata->hash, client->id, SILC_ID_CLIENT)) {
4273     silc_server_command_send_status_reply(cmd, SILC_COMMAND_OPER,
4274                                           SILC_STATUS_ERR_AUTH_FAILED);
4275     goto out;
4276   }
4277
4278   /* Client is now server operator */
4279   client->mode |= SILC_UMODE_SERVER_OPERATOR;
4280
4281   /* Send UMODE change to primary router */
4282   if (!server->standalone)
4283     silc_server_send_notify_umode(server, server->router->connection, TRUE,
4284                                   client->id, client->mode);
4285
4286   /* Send reply to the sender */
4287   silc_server_command_send_status_reply(cmd, SILC_COMMAND_OPER,
4288                                         SILC_STATUS_OK);
4289
4290  out:
4291   silc_server_command_free(cmd);
4292 }
4293
4294 /* Server side of SILCOPER command. Client uses this comand to obtain router
4295    operator privileges to this router. */
4296
4297 SILC_SERVER_CMD_FUNC(silcoper)
4298 {
4299   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
4300   SilcServer server = cmd->server;
4301   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
4302   unsigned char *username, *auth;
4303   uint32 tmp_len;
4304   SilcServerConfigSectionAdminConnection *admin;
4305   SilcIDListData idata = (SilcIDListData)client;
4306
4307   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_SILCOPER, cmd, 1, 2);
4308
4309   if (!client || cmd->sock->type != SILC_SOCKET_TYPE_CLIENT)
4310     goto out;
4311
4312   if (server->server_type == SILC_SERVER) {
4313     silc_server_command_send_status_reply(cmd, SILC_COMMAND_SILCOPER,
4314                                           SILC_STATUS_ERR_AUTH_FAILED);
4315     goto out;
4316   }
4317
4318   /* Get the username */
4319   username = silc_argument_get_arg_type(cmd->args, 1, &tmp_len);
4320   if (!username) {
4321     silc_server_command_send_status_reply(cmd, SILC_COMMAND_SILCOPER,
4322                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
4323     goto out;
4324   }
4325
4326   /* Get the admin configuration */
4327   admin = silc_server_config_find_admin(server->config, cmd->sock->ip,
4328                                         username, client->nickname);
4329   if (!admin) {
4330     admin = silc_server_config_find_admin(server->config, cmd->sock->hostname,
4331                                           username, client->nickname);
4332     if (!admin) {
4333       silc_server_command_send_status_reply(cmd, SILC_COMMAND_SILCOPER,
4334                                             SILC_STATUS_ERR_AUTH_FAILED);
4335       goto out;
4336     }
4337   }
4338
4339   /* Get the authentication payload */
4340   auth = silc_argument_get_arg_type(cmd->args, 2, &tmp_len);
4341   if (!auth) {
4342     silc_server_command_send_status_reply(cmd, SILC_COMMAND_SILCOPER,
4343                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
4344     goto out;
4345   }
4346
4347   /* Verify the authentication data */
4348   if (!silc_auth_verify_data(auth, tmp_len, admin->auth_meth,
4349                              admin->auth_data, admin->auth_data_len,
4350                              idata->hash, client->id, SILC_ID_CLIENT)) {
4351     silc_server_command_send_status_reply(cmd, SILC_COMMAND_SILCOPER,
4352                                           SILC_STATUS_ERR_AUTH_FAILED);
4353     goto out;
4354   }
4355
4356   /* Client is now router operator */
4357   client->mode |= SILC_UMODE_ROUTER_OPERATOR;
4358
4359   /* Send UMODE change to primary router */
4360   if (!server->standalone)
4361     silc_server_send_notify_umode(server, server->router->connection, TRUE,
4362                                   client->id, client->mode);
4363
4364   /* Send reply to the sender */
4365   silc_server_command_send_status_reply(cmd, SILC_COMMAND_SILCOPER,
4366                                         SILC_STATUS_OK);
4367
4368  out:
4369   silc_server_command_free(cmd);
4370 }
4371
4372 /* Server side command of CONNECT. Connects us to the specified remote
4373    server or router. */
4374
4375 SILC_SERVER_CMD_FUNC(connect)
4376 {
4377   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
4378   SilcServer server = cmd->server;
4379   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
4380   unsigned char *tmp, *host;
4381   uint32 tmp_len;
4382   uint32 port = SILC_PORT;
4383
4384   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_CONNECT, cmd, 1, 2);
4385
4386   if (!client || cmd->sock->type != SILC_SOCKET_TYPE_CLIENT)
4387     goto out;
4388
4389   /* Check whether client has the permissions. */
4390   if (client->mode == SILC_UMODE_NONE) {
4391     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CONNECT,
4392                                           SILC_STATUS_ERR_NO_SERVER_PRIV);
4393     goto out;
4394   }
4395
4396   if (server->server_type == SILC_ROUTER &&
4397       client->mode & SILC_UMODE_SERVER_OPERATOR) {
4398     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CONNECT,
4399                                           SILC_STATUS_ERR_NO_ROUTER_PRIV);
4400     goto out;
4401   }
4402
4403   /* Get the remote server */
4404   host = silc_argument_get_arg_type(cmd->args, 1, &tmp_len);
4405   if (!host) {
4406     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CONNECT,
4407                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
4408     goto out;
4409   }
4410
4411   /* Get port */
4412   tmp = silc_argument_get_arg_type(cmd->args, 2, &tmp_len);
4413   if (tmp)
4414     SILC_GET32_MSB(port, tmp);
4415
4416   /* Create the connection. It is done with timeout and is async. */
4417   silc_server_create_connection(server, host, port);
4418
4419   /* Send reply to the sender */
4420   silc_server_command_send_status_reply(cmd, SILC_COMMAND_CONNECT,
4421                                         SILC_STATUS_OK);
4422
4423  out:
4424   silc_server_command_free(cmd);
4425 }
4426
4427 /* Server side of command BAN. This is used to manage the ban list of the
4428    channel. To add clients and remove clients from the ban list. */
4429
4430 SILC_SERVER_CMD_FUNC(ban)
4431 {
4432   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
4433   SilcServer server = cmd->server;
4434   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
4435   SilcBuffer packet;
4436   SilcChannelEntry channel;
4437   SilcChannelClientEntry chl;
4438   SilcChannelID *channel_id = NULL;
4439   unsigned char *id, *add, *del;
4440   uint32 id_len, tmp_len;
4441   uint16 ident = silc_command_get_ident(cmd->payload);
4442
4443   if (cmd->sock->type != SILC_SOCKET_TYPE_CLIENT)
4444     goto out;
4445
4446   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_BAN, cmd, 0, 3);
4447
4448   /* Get Channel ID */
4449   id = silc_argument_get_arg_type(cmd->args, 1, &id_len);
4450   if (id) {
4451     channel_id = silc_id_payload_parse_id(id, id_len);
4452     if (!channel_id) {
4453       silc_server_command_send_status_reply(cmd, SILC_COMMAND_BAN,
4454                                             SILC_STATUS_ERR_NO_CHANNEL_ID);
4455       goto out;
4456     }
4457   }
4458
4459   /* Get channel entry. The server must know about the channel since the
4460      client is expected to be on the channel. */
4461   channel = silc_idlist_find_channel_by_id(server->local_list,
4462                                            channel_id, NULL);
4463   if (!channel) {
4464     channel = silc_idlist_find_channel_by_id(server->global_list,
4465                                              channel_id, NULL);
4466     if (!channel) {
4467       silc_server_command_send_status_reply(cmd, SILC_COMMAND_BAN,
4468                                             SILC_STATUS_ERR_NO_SUCH_CHANNEL);
4469       goto out;
4470     }
4471   }
4472
4473   /* Check whether this client is on the channel */
4474   if (!silc_server_client_on_channel(client, channel)) {
4475     silc_server_command_send_status_reply(cmd, SILC_COMMAND_BAN,
4476                                           SILC_STATUS_ERR_NOT_ON_CHANNEL);
4477     goto out;
4478   }
4479
4480   /* Get entry to the channel user list */
4481   silc_hash_table_find(channel->user_list, client, NULL, (void *)&chl);
4482
4483   /* The client must be at least channel operator. */
4484   if (!(chl->mode & SILC_CHANNEL_UMODE_CHANOP)) {
4485     silc_server_command_send_status_reply(cmd, SILC_COMMAND_BAN,
4486                                           SILC_STATUS_ERR_NO_CHANNEL_PRIV);
4487     goto out;
4488   }
4489
4490   /* Get the new ban and add it to the ban list */
4491   add = silc_argument_get_arg_type(cmd->args, 2, &tmp_len);
4492   if (add) {
4493     if (!channel->ban_list)
4494       channel->ban_list = silc_calloc(tmp_len + 2, sizeof(*channel->ban_list));
4495     else
4496       channel->ban_list = silc_realloc(channel->ban_list,
4497                                        sizeof(*channel->ban_list) *
4498                                        (tmp_len +
4499                                         strlen(channel->ban_list) + 2));
4500     if (add[tmp_len - 1] == ',')
4501       add[tmp_len - 1] = '\0';
4502
4503     strncat(channel->ban_list, add, tmp_len);
4504     strncat(channel->ban_list, ",", 1);
4505   }
4506
4507   /* Get the ban to be removed and remove it from the list */
4508   del = silc_argument_get_arg_type(cmd->args, 3, &tmp_len);
4509   if (del && channel->ban_list) {
4510     char *start, *end, *n;
4511
4512     if (!strncmp(channel->ban_list, del, strlen(channel->ban_list) - 1)) {
4513       silc_free(channel->ban_list);
4514       channel->ban_list = NULL;
4515     } else {
4516       start = strstr(channel->ban_list, del);
4517       if (start && strlen(start) >= tmp_len) {
4518         end = start + tmp_len;
4519         n = silc_calloc(strlen(channel->ban_list) - tmp_len, sizeof(*n));
4520         strncat(n, channel->ban_list, start - channel->ban_list);
4521         strncat(n, end + 1, ((channel->ban_list + strlen(channel->ban_list)) -
4522                              end) - 1);
4523         silc_free(channel->ban_list);
4524         channel->ban_list = n;
4525       }
4526     }
4527   }
4528
4529   /* Send the BAN notify type to our primary router. */
4530   if (!server->standalone && (add || del))
4531     silc_server_send_notify_ban(server, server->router->connection,
4532                                 server->server_type == SILC_ROUTER ?
4533                                 TRUE : FALSE, channel, add, del);
4534
4535   /* Send the reply back to the client */
4536   if (channel->ban_list)
4537     packet =
4538       silc_command_reply_payload_encode_va(SILC_COMMAND_BAN,
4539                                            SILC_STATUS_OK, ident, 2,
4540                                            2, id, id_len,
4541                                            3, channel->ban_list,
4542                                            strlen(channel->ban_list) - 1);
4543   else
4544     packet =
4545       silc_command_reply_payload_encode_va(SILC_COMMAND_BAN,
4546                                            SILC_STATUS_OK, ident, 1,
4547                                            2, id, id_len);
4548
4549   silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0,
4550                           packet->data, packet->len, FALSE);
4551
4552   silc_buffer_free(packet);
4553
4554  out:
4555   if (channel_id)
4556     silc_free(channel_id);
4557   silc_server_command_free(cmd);
4558 }
4559
4560 /* Server side command of CLOSE. Closes connection to a specified server. */
4561
4562 SILC_SERVER_CMD_FUNC(close)
4563 {
4564   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
4565   SilcServer server = cmd->server;
4566   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
4567   SilcServerEntry server_entry;
4568   SilcSocketConnection sock;
4569   unsigned char *tmp;
4570   uint32 tmp_len;
4571   unsigned char *name;
4572   uint32 port = SILC_PORT;
4573
4574   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_CLOSE, cmd, 1, 2);
4575
4576   if (!client || cmd->sock->type != SILC_SOCKET_TYPE_CLIENT)
4577     goto out;
4578
4579   /* Check whether client has the permissions. */
4580   if (client->mode == SILC_UMODE_NONE) {
4581     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CLOSE,
4582                                           SILC_STATUS_ERR_NO_SERVER_PRIV);
4583     goto out;
4584   }
4585
4586   /* Get the remote server */
4587   name = silc_argument_get_arg_type(cmd->args, 1, &tmp_len);
4588   if (!name) {
4589     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CLOSE,
4590                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
4591     goto out;
4592   }
4593
4594   /* Get port */
4595   tmp = silc_argument_get_arg_type(cmd->args, 2, &tmp_len);
4596   if (tmp)
4597     SILC_GET32_MSB(port, tmp);
4598
4599   server_entry = silc_idlist_find_server_by_conn(server->local_list,
4600                                                  name, port, FALSE, NULL);
4601   if (!server_entry) {
4602     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CLOSE,
4603                                           SILC_STATUS_ERR_NO_SERVER_ID);
4604     goto out;
4605   }
4606
4607   /* Send reply to the sender */
4608   silc_server_command_send_status_reply(cmd, SILC_COMMAND_CLOSE,
4609                                         SILC_STATUS_OK);
4610
4611   /* Close the connection to the server */
4612   sock = (SilcSocketConnection)server_entry->connection;
4613   if (sock->user_data)
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     if (!silc_server_create_channel_key(server, channel, 0))
4720       goto out;
4721
4722     /* Send the channel key */
4723     silc_server_send_channel_key(server, NULL, channel,
4724                                  server->server_type == SILC_ROUTER ?
4725                                  FALSE : !server->standalone);
4726   }
4727
4728  out:
4729   if (id)
4730     silc_free(id);
4731   silc_server_command_free(cmd);
4732 }
4733
4734 /* Server side of command USERS. Resolves clients and their USERS currently
4735    joined on the requested channel. The list of Client ID's and their modes
4736    on the channel is sent back. */
4737
4738 SILC_SERVER_CMD_FUNC(users)
4739 {
4740   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
4741   SilcServer server = cmd->server;
4742   SilcChannelEntry channel;
4743   SilcChannelID *id = NULL;
4744   SilcBuffer packet, idp;
4745   unsigned char *channel_id;
4746   uint32 channel_id_len;
4747   SilcBuffer client_id_list;
4748   SilcBuffer client_mode_list;
4749   unsigned char lc[4];
4750   uint32 list_count = 0;
4751   uint16 ident = silc_command_get_ident(cmd->payload);
4752   char *channel_name;
4753
4754   SILC_SERVER_COMMAND_CHECK(SILC_COMMAND_USERS, cmd, 1, 2);
4755
4756   /* Get Channel ID */
4757   channel_id = silc_argument_get_arg_type(cmd->args, 1, &channel_id_len);
4758
4759   /* Get channel name */
4760   channel_name = silc_argument_get_arg_type(cmd->args, 2, NULL);
4761
4762   if (!channel_id && !channel_name) {
4763     silc_server_command_send_status_reply(cmd, SILC_COMMAND_USERS,
4764                                           SILC_STATUS_ERR_NO_CHANNEL_ID);
4765     goto out;
4766   }
4767
4768   if (channel_id) {
4769     id = silc_id_payload_parse_id(channel_id, channel_id_len);
4770     if (!id) {
4771       silc_server_command_send_status_reply(cmd, SILC_COMMAND_USERS,
4772                                             SILC_STATUS_ERR_NO_CHANNEL_ID);
4773       goto out;
4774     }
4775   }
4776
4777   /* If we are server and we don't know about this channel we will send
4778      the command to our router. If we know about the channel then we also
4779      have the list of users already. */
4780   if (id)
4781     channel = silc_idlist_find_channel_by_id(server->local_list, id, NULL);
4782   else
4783     channel = silc_idlist_find_channel_by_name(server->local_list,
4784                                                channel_name, NULL);
4785
4786   if (!channel) {
4787     if (server->server_type == SILC_SERVER && !server->standalone &&
4788         !cmd->pending) {
4789       SilcBuffer tmpbuf;
4790
4791       silc_command_set_ident(cmd->payload, silc_rng_get_rn16(server->rng));
4792       tmpbuf = silc_command_payload_encode_payload(cmd->payload);
4793
4794       /* Send USERS command */
4795       silc_server_packet_send(server, server->router->connection,
4796                               SILC_PACKET_COMMAND, cmd->packet->flags,
4797                               tmpbuf->data, tmpbuf->len, TRUE);
4798
4799       /* Reprocess this packet after received reply */
4800       silc_server_command_pending(server, SILC_COMMAND_USERS,
4801                                   silc_command_get_ident(cmd->payload),
4802                                   silc_server_command_destructor,
4803                                   silc_server_command_users,
4804                                   silc_server_command_dup(cmd));
4805       cmd->pending = TRUE;
4806       silc_command_set_ident(cmd->payload, ident);
4807
4808       silc_buffer_free(tmpbuf);
4809       silc_free(id);
4810       return;
4811     }
4812
4813     /* Check the global list as well. */
4814     if (id)
4815       channel = silc_idlist_find_channel_by_id(server->global_list, id, NULL);
4816     else
4817       channel = silc_idlist_find_channel_by_name(server->global_list,
4818                                                  channel_name, NULL);
4819     if (!channel) {
4820       /* Channel really does not exist */
4821       silc_server_command_send_status_reply(cmd, SILC_COMMAND_USERS,
4822                                             SILC_STATUS_ERR_NO_SUCH_CHANNEL);
4823       goto out;
4824     }
4825   }
4826
4827   /* If the channel is private or secret do not send anything */
4828   if (channel->mode & (SILC_CHANNEL_MODE_PRIVATE | SILC_CHANNEL_MODE_SECRET)) {
4829     silc_server_command_send_status_reply(cmd, SILC_COMMAND_USERS,
4830                                           SILC_STATUS_ERR_NO_SUCH_CHANNEL);
4831     goto out;
4832   }
4833
4834   /* Get the users list */
4835   silc_server_get_users_on_channel(server, channel, &client_id_list,
4836                                    &client_mode_list, &list_count);
4837
4838   /* List count */
4839   SILC_PUT32_MSB(list_count, lc);
4840
4841   /* Send reply */
4842   idp = silc_id_payload_encode(channel->id, SILC_ID_CHANNEL);
4843   packet = silc_command_reply_payload_encode_va(SILC_COMMAND_USERS,
4844                                                 SILC_STATUS_OK, ident, 4,
4845                                                 2, idp->data, idp->len,
4846                                                 3, lc, 4,
4847                                                 4, client_id_list->data,
4848                                                 client_id_list->len,
4849                                                 5, client_mode_list->data,
4850                                                 client_mode_list->len);
4851   silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0,
4852                           packet->data, packet->len, FALSE);
4853
4854   silc_buffer_free(idp);
4855   silc_buffer_free(packet);
4856   silc_buffer_free(client_id_list);
4857   silc_buffer_free(client_mode_list);
4858   if (id)
4859     silc_free(id);
4860
4861  out:
4862   silc_server_command_free(cmd);
4863 }
4864
4865 /* Server side of command GETKEY. This fetches the client's public key
4866    from the server where to the client is connected. */
4867
4868 SILC_SERVER_CMD_FUNC(getkey)
4869 {
4870   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
4871   SilcServer server = cmd->server;
4872   SilcBuffer packet;
4873   SilcClientEntry client;
4874   SilcServerEntry server_entry;
4875   SilcClientID *client_id = NULL;
4876   SilcServerID *server_id = NULL;
4877   SilcIDPayload idp = NULL;
4878   uint16 ident = silc_command_get_ident(cmd->payload);
4879   unsigned char *tmp;
4880   uint32 tmp_len;
4881   SilcBuffer pk;
4882   SilcIdType id_type;
4883
4884   SILC_LOG_DEBUG(("Start"));
4885
4886   tmp = silc_argument_get_arg_type(cmd->args, 1, &tmp_len);
4887   if (!tmp) {
4888     silc_server_command_send_status_reply(cmd, SILC_COMMAND_GETKEY,
4889                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
4890     goto out;
4891   }
4892   idp = silc_id_payload_parse_data(tmp, tmp_len);
4893   if (!idp) {
4894     silc_server_command_send_status_reply(cmd, SILC_COMMAND_GETKEY,
4895                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
4896     goto out;
4897   }
4898
4899   id_type = silc_id_payload_get_type(idp);
4900   if (id_type == SILC_ID_CLIENT) {
4901     client_id = silc_id_payload_get_id(idp);
4902
4903     /* If the client is not found from local list there is no chance it
4904        would be locally connected client so send the command further. */
4905     client = silc_idlist_find_client_by_id(server->local_list,
4906                                            client_id, TRUE, NULL);
4907     if (!client)
4908       client = silc_idlist_find_client_by_id(server->global_list,
4909                                              client_id, TRUE, NULL);
4910
4911     if ((!client && !cmd->pending && !server->standalone) ||
4912         (client && !client->connection && !cmd->pending &&
4913          !server->standalone) ||
4914         (client && !client->data.public_key && !cmd->pending &&
4915          !server->standalone)) {
4916       SilcBuffer tmpbuf;
4917       uint16 old_ident;
4918       SilcSocketConnection dest_sock;
4919
4920       dest_sock = silc_server_get_client_route(server, NULL, 0,
4921                                                client_id, NULL);
4922       if (!dest_sock)
4923         goto out;
4924
4925       old_ident = silc_command_get_ident(cmd->payload);
4926       silc_command_set_ident(cmd->payload, silc_rng_get_rn16(server->rng));
4927       tmpbuf = silc_command_payload_encode_payload(cmd->payload);
4928
4929       silc_server_packet_send(server, dest_sock,
4930                               SILC_PACKET_COMMAND, cmd->packet->flags,
4931                               tmpbuf->data, tmpbuf->len, TRUE);
4932
4933       /* Reprocess this packet after received reply from router */
4934       silc_server_command_pending(server, SILC_COMMAND_GETKEY,
4935                                   silc_command_get_ident(cmd->payload),
4936                                   silc_server_command_destructor,
4937                                   silc_server_command_getkey,
4938                                   silc_server_command_dup(cmd));
4939       cmd->pending = TRUE;
4940
4941       silc_command_set_ident(cmd->payload, old_ident);
4942       silc_buffer_free(tmpbuf);
4943       return;
4944     }
4945
4946     if (!client && cmd->pending) {
4947       silc_server_command_send_status_reply(cmd, SILC_COMMAND_GETKEY,
4948                                             SILC_STATUS_ERR_NO_SUCH_CLIENT_ID);
4949       goto out;
4950     }
4951
4952     /* The client is locally connected, just get the public key and
4953        send it back. */
4954     tmp = silc_pkcs_public_key_encode(client->data.public_key, &tmp_len);
4955     pk = silc_buffer_alloc(4 + tmp_len);
4956     silc_buffer_pull_tail(pk, SILC_BUFFER_END(pk));
4957     silc_buffer_format(pk,
4958                        SILC_STR_UI_SHORT(tmp_len),
4959                        SILC_STR_UI_SHORT(SILC_SKE_PK_TYPE_SILC),
4960                        SILC_STR_UI_XNSTRING(tmp, tmp_len),
4961                        SILC_STR_END);
4962     silc_free(tmp);
4963
4964   } else if (id_type == SILC_ID_SERVER) {
4965     server_id = silc_id_payload_get_id(idp);
4966
4967     /* If the server is not found from local list there is no chance it
4968        would be locally connected server so send the command further. */
4969     server_entry = silc_idlist_find_server_by_id(server->local_list,
4970                                                  server_id, TRUE, NULL);
4971     if (!server_entry)
4972       server_entry = silc_idlist_find_server_by_id(server->global_list,
4973                                                    server_id, TRUE, NULL);
4974
4975     if ((!server_entry && !cmd->pending && !server->standalone) ||
4976         (server_entry && !server_entry->connection && !cmd->pending &&
4977          !server->standalone) ||
4978         (server_entry && !server_entry->data.public_key && !cmd->pending &&
4979          !server->standalone)) {
4980       SilcBuffer tmpbuf;
4981       uint16 old_ident;
4982
4983       old_ident = silc_command_get_ident(cmd->payload);
4984       silc_command_set_ident(cmd->payload, silc_rng_get_rn16(server->rng));
4985       tmpbuf = silc_command_payload_encode_payload(cmd->payload);
4986
4987       silc_server_packet_send(server, server->router->connection,
4988                               SILC_PACKET_COMMAND, cmd->packet->flags,
4989                               tmpbuf->data, tmpbuf->len, TRUE);
4990
4991       /* Reprocess this packet after received reply from router */
4992       silc_server_command_pending(server, SILC_COMMAND_GETKEY,
4993                                   silc_command_get_ident(cmd->payload),
4994                                   silc_server_command_destructor,
4995                                   silc_server_command_getkey,
4996                                   silc_server_command_dup(cmd));
4997       cmd->pending = TRUE;
4998
4999       silc_command_set_ident(cmd->payload, old_ident);
5000       silc_buffer_free(tmpbuf);
5001       return;
5002     }
5003
5004     if (!server_entry && cmd->pending) {
5005       silc_server_command_send_status_reply(cmd, SILC_COMMAND_GETKEY,
5006                                             SILC_STATUS_ERR_NO_SUCH_SERVER_ID);
5007       goto out;
5008     }
5009
5010     /* The client is locally connected, just get the public key and
5011        send it back. */
5012     tmp = silc_pkcs_public_key_encode(server_entry->data.public_key, &tmp_len);
5013     pk = silc_buffer_alloc(4 + tmp_len);
5014     silc_buffer_pull_tail(pk, SILC_BUFFER_END(pk));
5015     silc_buffer_format(pk,
5016                        SILC_STR_UI_SHORT(tmp_len),
5017                        SILC_STR_UI_SHORT(SILC_SKE_PK_TYPE_SILC),
5018                        SILC_STR_UI_XNSTRING(tmp, tmp_len),
5019                        SILC_STR_END);
5020     silc_free(tmp);
5021   } else {
5022     goto out;
5023   }
5024
5025   tmp = silc_argument_get_arg_type(cmd->args, 1, &tmp_len);
5026   packet = silc_command_reply_payload_encode_va(SILC_COMMAND_GETKEY,
5027                                                 SILC_STATUS_OK, ident, 2,
5028                                                 2, tmp, tmp_len,
5029                                                 3, pk->data, pk->len);
5030   silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0,
5031                           packet->data, packet->len, FALSE);
5032   silc_buffer_free(packet);
5033   silc_buffer_free(pk);
5034
5035  out:
5036   if (idp)
5037     silc_id_payload_free(idp);
5038   silc_free(client_id);
5039   silc_free(server_id);
5040   silc_server_command_free(cmd);
5041 }