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