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   packet = silc_command_reply_payload_encode_va(SILC_COMMAND_INFO,
2658                                                 SILC_STATUS_OK, ident, 3,
2659                                                 2, idp->data, idp->len,
2660                                                 3, server_name,
2661                                                 strlen(server_name),
2662                                                 4, server_info,
2663                                                 strlen(server_info));
2664   silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0,
2665                           packet->data, packet->len, FALSE);
2666
2667   silc_buffer_free(packet);
2668   silc_buffer_free(idp);
2669
2670  out:
2671   silc_server_command_free(cmd);
2672 }
2673
2674 /* Server side of command PING. This just replies to the ping. */
2675
2676 SILC_SERVER_CMD_FUNC(ping)
2677 {
2678   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
2679   SilcServer server = cmd->server;
2680   SilcServerID *id;
2681   uint32 len;
2682   unsigned char *tmp;
2683
2684   SILC_SERVER_COMMAND_CHECK_ARGC(SILC_COMMAND_INFO, cmd, 1, 2);
2685
2686   /* Get Server ID */
2687   tmp = silc_argument_get_arg_type(cmd->args, 1, &len);
2688   if (!tmp) {
2689     silc_server_command_send_status_reply(cmd, SILC_COMMAND_PING,
2690                                           SILC_STATUS_ERR_NO_SERVER_ID);
2691     goto out;
2692   }
2693   id = silc_id_str2id(tmp, len, SILC_ID_SERVER);
2694   if (!id)
2695     goto out;
2696
2697   if (SILC_ID_SERVER_COMPARE(id, server->id)) {
2698     /* Send our reply */
2699     silc_server_command_send_status_reply(cmd, SILC_COMMAND_PING,
2700                                           SILC_STATUS_OK);
2701   } else {
2702     silc_server_command_send_status_reply(cmd, SILC_COMMAND_PING,
2703                                           SILC_STATUS_ERR_NO_SUCH_SERVER);
2704     goto out;
2705   }
2706
2707   silc_free(id);
2708
2709  out:
2710   silc_server_command_free(cmd);
2711 }
2712
2713 /* Internal routine to join channel. The channel sent to this function
2714    has been either created or resolved from ID lists. This joins the sent
2715    client to the channel. */
2716
2717 static void silc_server_command_join_channel(SilcServer server,
2718                                              SilcServerCommandContext cmd,
2719                                              SilcChannelEntry channel,
2720                                              SilcClientID *client_id,
2721                                              int created,
2722                                              uint32 umode)
2723 {
2724   SilcSocketConnection sock = cmd->sock;
2725   unsigned char *tmp;
2726   uint32 tmp_len, user_count;
2727   unsigned char *passphrase = NULL, mode[4], tmp2[4], tmp3[4];
2728   SilcClientEntry client;
2729   SilcChannelClientEntry chl;
2730   SilcBuffer reply, chidp, clidp, keyp = NULL, user_list, mode_list;
2731   uint16 ident = silc_command_get_ident(cmd->payload);
2732   char check[512];
2733
2734   SILC_LOG_DEBUG(("Start"));
2735
2736   if (!channel)
2737     return;
2738
2739   /* Get the client entry */
2740   if (cmd->sock->type == SILC_SOCKET_TYPE_CLIENT) {
2741     client = (SilcClientEntry)sock->user_data;
2742   } else {
2743     client = silc_idlist_find_client_by_id(server->local_list, client_id,
2744                                            NULL);
2745     if (!client)
2746       goto out;
2747   }
2748
2749   /*
2750    * Check channel modes
2751    */
2752
2753   if (cmd->sock->type == SILC_SOCKET_TYPE_CLIENT) {
2754     strncat(check, client->nickname, strlen(client->nickname));
2755     if (!strchr(client->nickname, '@')) {
2756       strncat(check, "@", 1);
2757       strncat(check, server->server_name, strlen(server->server_name));
2758     }
2759     strncat(check, "!", 1);
2760     strncat(check, client->username, strlen(client->username));
2761     if (!strchr(client->username, '@')) {
2762       strncat(check, "@", 1);
2763       strncat(check, cmd->sock->hostname, strlen(cmd->sock->hostname));
2764     }
2765   }
2766
2767   /* Check invite list if channel is invite-only channel */
2768   if (cmd->sock->type == SILC_SOCKET_TYPE_CLIENT &&
2769       channel->mode & SILC_CHANNEL_MODE_INVITE) {
2770     if (!channel->invite_list) {
2771       silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
2772                                             SILC_STATUS_ERR_NOT_INVITED);
2773       goto out;
2774     }
2775
2776     if (!silc_string_match(channel->invite_list, check)) {
2777       silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
2778                                             SILC_STATUS_ERR_NOT_INVITED);
2779       goto out;
2780     }
2781   }
2782
2783   /* Check ban list if it exists. If the client's nickname, server,
2784      username and/or hostname is in the ban list the access to the
2785      channel is denied. */
2786   if (cmd->sock->type == SILC_SOCKET_TYPE_CLIENT && channel->ban_list) {
2787     if (silc_string_match(channel->ban_list, check)) {
2788       silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
2789                               SILC_STATUS_ERR_BANNED_FROM_CHANNEL);
2790       goto out;
2791     }
2792   }
2793
2794   /* Get passphrase */
2795   tmp = silc_argument_get_arg_type(cmd->args, 3, &tmp_len);
2796   if (tmp) {
2797     passphrase = silc_calloc(tmp_len, sizeof(*passphrase));
2798     memcpy(passphrase, tmp, tmp_len);
2799   }
2800
2801   /* Check the channel passphrase if set. */
2802   if (channel->mode & SILC_CHANNEL_MODE_PASSPHRASE) {
2803     if (!passphrase || memcmp(channel->passphrase, passphrase,
2804                               strlen(channel->passphrase))) {
2805       silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
2806                                             SILC_STATUS_ERR_BAD_PASSWORD);
2807       goto out;
2808     }
2809   }
2810
2811   /* Check user count limit if set. */
2812   if (channel->mode & SILC_CHANNEL_MODE_ULIMIT) {
2813     if (silc_hash_table_count(channel->user_list) + 1 >
2814         channel->user_limit) {
2815       silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
2816                                             SILC_STATUS_ERR_CHANNEL_IS_FULL);
2817       goto out;
2818     }
2819   }
2820
2821   /*
2822    * Client is allowed to join to the channel. Make it happen.
2823    */
2824
2825   /* Check whether the client already is on the channel */
2826   if (silc_server_client_on_channel(client, channel)) {
2827     silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
2828                                           SILC_STATUS_ERR_USER_ON_CHANNEL);
2829     goto out;
2830   }
2831
2832   /* Generate new channel key as protocol dictates */
2833   if ((!created && silc_hash_table_count(channel->user_list) > 0) ||
2834       !channel->channel_key)
2835     silc_server_create_channel_key(server, channel, 0);
2836
2837   /* Send the channel key. This is broadcasted to the channel but is not
2838      sent to the client who is joining to the channel. */
2839   if (!(channel->mode & SILC_CHANNEL_MODE_PRIVKEY))
2840     silc_server_send_channel_key(server, NULL, channel,
2841                                  server->server_type == SILC_ROUTER ?
2842                                  FALSE : !server->standalone);
2843
2844   /* Join the client to the channel by adding it to channel's user list.
2845      Add also the channel to client entry's channels list for fast cross-
2846      referencing. */
2847   chl = silc_calloc(1, sizeof(*chl));
2848   chl->mode = umode;
2849   chl->client = client;
2850   chl->channel = channel;
2851   silc_hash_table_add(channel->user_list, client, chl);
2852   silc_hash_table_add(client->channels, channel, chl);
2853
2854   /* Get users on the channel */
2855   silc_server_get_users_on_channel(server, channel, &user_list, &mode_list,
2856                                    &user_count);
2857
2858   /* Encode Client ID Payload of the original client who wants to join */
2859   clidp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
2860
2861   /* Encode command reply packet */
2862   chidp = silc_id_payload_encode(channel->id, SILC_ID_CHANNEL);
2863   SILC_PUT32_MSB(channel->mode, mode);
2864   SILC_PUT32_MSB(created, tmp2);
2865   SILC_PUT32_MSB(user_count, tmp3);
2866
2867   if (!(channel->mode & SILC_CHANNEL_MODE_PRIVKEY)) {
2868     tmp = silc_id_id2str(channel->id, SILC_ID_CHANNEL);
2869     keyp = silc_channel_key_payload_encode(SILC_ID_CHANNEL_LEN, tmp,
2870                                            strlen(channel->channel_key->
2871                                                   cipher->name),
2872                                            channel->channel_key->cipher->name,
2873                                            channel->key_len / 8, channel->key);
2874     silc_free(tmp);
2875   }
2876
2877   reply =
2878     silc_command_reply_payload_encode_va(SILC_COMMAND_JOIN,
2879                                          SILC_STATUS_OK, ident, 13,
2880                                          2, channel->channel_name,
2881                                          strlen(channel->channel_name),
2882                                          3, chidp->data, chidp->len,
2883                                          4, clidp->data, clidp->len,
2884                                          5, mode, 4,
2885                                          6, tmp2, 4,
2886                                          7, keyp ? keyp->data : NULL,
2887                                          keyp ? keyp->len : 0,
2888                                          8, channel->ban_list,
2889                                          channel->ban_list ?
2890                                          strlen(channel->ban_list) : 0,
2891                                          9, channel->invite_list,
2892                                          channel->invite_list ?
2893                                          strlen(channel->invite_list) : 0,
2894                                          10, channel->topic,
2895                                          channel->topic ?
2896                                          strlen(channel->topic) : 0,
2897                                          11, channel->hmac->hmac->name,
2898                                          strlen(channel->hmac->hmac->name),
2899                                          12, tmp3, 4,
2900                                          13, user_list->data, user_list->len,
2901                                          14, mode_list->data,
2902                                          mode_list->len);
2903
2904   /* Send command reply */
2905   silc_server_packet_send(server, sock, SILC_PACKET_COMMAND_REPLY, 0,
2906                           reply->data, reply->len, FALSE);
2907
2908   if (!cmd->pending) {
2909     /* Send JOIN notify to locally connected clients on the channel */
2910     silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
2911                                        SILC_NOTIFY_TYPE_JOIN, 2,
2912                                        clidp->data, clidp->len,
2913                                        chidp->data, chidp->len);
2914
2915     /* Send JOIN notify packet to our primary router */
2916     if (!server->standalone)
2917       silc_server_send_notify_join(server, server->router->connection,
2918                                    server->server_type == SILC_ROUTER ?
2919                                    TRUE : FALSE, channel, client->id);
2920   }
2921
2922   silc_buffer_free(reply);
2923   silc_buffer_free(clidp);
2924   silc_buffer_free(chidp);
2925   silc_buffer_free(keyp);
2926   silc_buffer_free(user_list);
2927   silc_buffer_free(mode_list);
2928
2929  out:
2930   if (passphrase)
2931     silc_free(passphrase);
2932 }
2933
2934 /* Server side of command JOIN. Joins client into requested channel. If
2935    the channel does not exist it will be created. */
2936
2937 SILC_SERVER_CMD_FUNC(join)
2938 {
2939   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
2940   SilcServer server = cmd->server;
2941   uint32 tmp_len;
2942   char *tmp, *channel_name = NULL, *cipher, *hmac;
2943   SilcChannelEntry channel;
2944   uint32 umode = 0;
2945   int created = FALSE;
2946   SilcClientID *client_id;
2947
2948   SILC_SERVER_COMMAND_CHECK_ARGC(SILC_COMMAND_JOIN, cmd, 1, 4);
2949
2950   /* Get channel name */
2951   tmp = silc_argument_get_arg_type(cmd->args, 1, &tmp_len);
2952   if (!tmp) {
2953     silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
2954                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
2955     goto out;
2956   }
2957   channel_name = tmp;
2958
2959   if (strlen(channel_name) > 256)
2960     channel_name[255] = '\0';
2961
2962   if (silc_server_command_bad_chars(channel_name) == TRUE) {
2963     silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
2964                                           SILC_STATUS_ERR_BAD_CHANNEL);
2965     silc_free(channel_name);
2966     goto out;
2967   }
2968
2969   /* Get Client ID of the client who is joining to the channel */
2970   tmp = silc_argument_get_arg_type(cmd->args, 2, &tmp_len);
2971   if (!tmp) {
2972     silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
2973                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
2974     goto out;
2975   }
2976   client_id = silc_id_payload_parse_id(tmp, tmp_len);
2977   if (!client_id) {
2978     silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
2979                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
2980     goto out;
2981   }
2982
2983   /* Get cipher and hmac name */
2984   cipher = silc_argument_get_arg_type(cmd->args, 4, NULL);
2985   hmac = silc_argument_get_arg_type(cmd->args, 5, NULL);
2986
2987   /* See if the channel exists */
2988   channel = silc_idlist_find_channel_by_name(server->local_list,
2989                                              channel_name, NULL);
2990
2991   if (cmd->sock->type == SILC_SOCKET_TYPE_CLIENT) {
2992     /* If this is coming from client the Client ID in the command packet must
2993        be same as the client's ID. */
2994     if (cmd->sock->type == SILC_SOCKET_TYPE_CLIENT) {
2995       SilcClientEntry entry = (SilcClientEntry)cmd->sock->user_data;
2996       if (!SILC_ID_CLIENT_COMPARE(entry->id, client_id)) {
2997         silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
2998                                         SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
2999         goto out;
3000       }
3001     }
3002
3003     if (!channel || !channel->id) {
3004       /* Channel not found */
3005
3006       /* If we are standalone server we don't have a router, we just create
3007          the channel by ourselves. */
3008       if (server->standalone) {
3009         channel = silc_server_create_new_channel(server, server->id, cipher,
3010                                                  hmac, channel_name, TRUE);
3011         if (!channel) {
3012           silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
3013                                      SILC_STATUS_ERR_UNKNOWN_ALGORITHM);
3014           goto out;
3015         }
3016
3017         umode = (SILC_CHANNEL_UMODE_CHANOP | SILC_CHANNEL_UMODE_CHANFO);
3018         created = TRUE;
3019
3020       } else {
3021
3022         /* The channel does not exist on our server. If we are normal server
3023            we will send JOIN command to our router which will handle the
3024            joining procedure (either creates the channel if it doesn't exist
3025            or joins the client to it). */
3026         if (server->server_type == SILC_SERVER) {
3027           SilcBuffer tmpbuf;
3028           uint16 old_ident;
3029
3030           old_ident = silc_command_get_ident(cmd->payload);
3031           silc_command_set_ident(cmd->payload, silc_rng_get_rn16(server->rng));
3032           tmpbuf = silc_command_payload_encode_payload(cmd->payload);
3033
3034           /* Send JOIN command to our router */
3035           silc_server_packet_send(server, (SilcSocketConnection)
3036                                   server->router->connection,
3037                                   SILC_PACKET_COMMAND, cmd->packet->flags,
3038                                   tmpbuf->data, tmpbuf->len, TRUE);
3039
3040           /* Reprocess this packet after received reply from router */
3041           silc_server_command_pending(server, SILC_COMMAND_JOIN,
3042                                       silc_command_get_ident(cmd->payload),
3043                                       silc_server_command_destructor,
3044                                       silc_server_command_join,
3045                                       silc_server_command_dup(cmd));
3046           cmd->pending = TRUE;
3047           return;
3048         }
3049
3050         /* We are router and the channel does not seem exist so we will check
3051            our global list as well for the channel. */
3052         channel = silc_idlist_find_channel_by_name(server->global_list,
3053                                                    channel_name, NULL);
3054         if (!channel) {
3055           /* Channel really does not exist, create it */
3056           channel = silc_server_create_new_channel(server, server->id, cipher,
3057                                                    hmac, channel_name, TRUE);
3058           if (!channel) {
3059             silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
3060                                        SILC_STATUS_ERR_UNKNOWN_ALGORITHM);
3061             goto out;
3062           }
3063
3064           umode = (SILC_CHANNEL_UMODE_CHANOP | SILC_CHANNEL_UMODE_CHANFO);
3065           created = TRUE;
3066         }
3067       }
3068     }
3069   } else {
3070     if (!channel) {
3071       /* Channel not found */
3072
3073       /* If the command came from router and/or we are normal server then
3074          something went wrong with the joining as the channel was not found.
3075          We can't do anything else but ignore this. */
3076       if (cmd->sock->type == SILC_SOCKET_TYPE_ROUTER ||
3077           server->server_type == SILC_SERVER)
3078         goto out;
3079
3080       /* We are router and the channel does not seem exist so we will check
3081          our global list as well for the channel. */
3082       channel = silc_idlist_find_channel_by_name(server->global_list,
3083                                                  channel_name, NULL);
3084       if (!channel) {
3085         /* Channel really does not exist, create it */
3086         channel = silc_server_create_new_channel(server, server->id, cipher,
3087                                                  hmac, channel_name, TRUE);
3088         if (!channel) {
3089           silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN,
3090                                        SILC_STATUS_ERR_UNKNOWN_ALGORITHM);
3091           goto out;
3092         }
3093
3094         umode = (SILC_CHANNEL_UMODE_CHANOP | SILC_CHANNEL_UMODE_CHANFO);
3095         created = TRUE;
3096       }
3097     }
3098   }
3099
3100   /* If the channel does not have global users and is also empty it means the
3101      channel was created globally (by our router) and the client will be the
3102      channel founder and operator. */
3103   if (!channel->global_users && !silc_hash_table_count(channel->user_list)) {
3104     umode = (SILC_CHANNEL_UMODE_CHANOP | SILC_CHANNEL_UMODE_CHANFO);
3105     created = TRUE;             /* Created globally by our router */
3106   }
3107
3108   /* Join to the channel */
3109   silc_server_command_join_channel(server, cmd, channel, client_id,
3110                                    created, umode);
3111
3112   silc_free(client_id);
3113
3114  out:
3115   silc_server_command_free(cmd);
3116 }
3117
3118 /* Server side of command MOTD. Sends server's current "message of the
3119    day" to the client. */
3120
3121 SILC_SERVER_CMD_FUNC(motd)
3122 {
3123   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
3124   SilcServer server = cmd->server;
3125   SilcBuffer packet, idp;
3126   char *motd, *dest_server;
3127   uint32 motd_len;
3128   uint16 ident = silc_command_get_ident(cmd->payload);
3129
3130   SILC_SERVER_COMMAND_CHECK_ARGC(SILC_COMMAND_MOTD, cmd, 1, 1);
3131
3132   /* Get server name */
3133   dest_server = silc_argument_get_arg_type(cmd->args, 1, NULL);
3134   if (!dest_server) {
3135     silc_server_command_send_status_reply(cmd, SILC_COMMAND_MOTD,
3136                                           SILC_STATUS_ERR_NO_SUCH_SERVER);
3137     goto out;
3138   }
3139
3140   if (!strncasecmp(dest_server, server->server_name, strlen(dest_server))) {
3141     /* Send our MOTD */
3142
3143     idp = silc_id_payload_encode(server->id_entry->id, SILC_ID_SERVER);
3144
3145     if (server->config && server->config->motd &&
3146         server->config->motd->motd_file) {
3147       /* Send motd */
3148       motd = silc_file_read(server->config->motd->motd_file, &motd_len);
3149       if (!motd)
3150         goto out;
3151
3152       motd[motd_len] = 0;
3153       packet = silc_command_reply_payload_encode_va(SILC_COMMAND_MOTD,
3154                                                     SILC_STATUS_OK, ident, 2,
3155                                                     2, idp, idp->len,
3156                                                     3, motd, motd_len);
3157       goto out;
3158     } else {
3159       /* No motd */
3160       packet = silc_command_reply_payload_encode_va(SILC_COMMAND_MOTD,
3161                                                     SILC_STATUS_OK, ident, 1,
3162                                                     2, idp, idp->len);
3163     }
3164
3165     silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0,
3166                             packet->data, packet->len, FALSE);
3167     silc_buffer_free(packet);
3168     silc_buffer_free(idp);
3169   } else {
3170     SilcServerEntry entry;
3171
3172     /* Check whether we have this server cached */
3173     entry = silc_idlist_find_server_by_name(server->global_list,
3174                                             dest_server, NULL);
3175     if (!entry) {
3176       entry = silc_idlist_find_server_by_name(server->local_list,
3177                                               dest_server, NULL);
3178     }
3179
3180     if (server->server_type == SILC_ROUTER && !cmd->pending &&
3181         entry && !entry->motd) {
3182       /* Send to the server */
3183       SilcBuffer tmpbuf;
3184       uint16 old_ident;
3185
3186       old_ident = silc_command_get_ident(cmd->payload);
3187       silc_command_set_ident(cmd->payload, silc_rng_get_rn16(server->rng));
3188       tmpbuf = silc_command_payload_encode_payload(cmd->payload);
3189
3190       silc_server_packet_send(server, entry->connection,
3191                               SILC_PACKET_COMMAND, cmd->packet->flags,
3192                               tmpbuf->data, tmpbuf->len, TRUE);
3193
3194       /* Reprocess this packet after received reply from router */
3195       silc_server_command_pending(server, SILC_COMMAND_MOTD,
3196                                   silc_command_get_ident(cmd->payload),
3197                                   silc_server_command_destructor,
3198                                   silc_server_command_motd,
3199                                   silc_server_command_dup(cmd));
3200       cmd->pending = TRUE;
3201       silc_command_set_ident(cmd->payload, old_ident);
3202       silc_buffer_free(tmpbuf);
3203       return;
3204     }
3205
3206     if (!entry && !cmd->pending && !server->standalone) {
3207       /* Send to the primary router */
3208       SilcBuffer tmpbuf;
3209       uint16 old_ident;
3210
3211       old_ident = silc_command_get_ident(cmd->payload);
3212       silc_command_set_ident(cmd->payload, silc_rng_get_rn16(server->rng));
3213       tmpbuf = silc_command_payload_encode_payload(cmd->payload);
3214
3215       silc_server_packet_send(server, server->router->connection,
3216                               SILC_PACKET_COMMAND, cmd->packet->flags,
3217                               tmpbuf->data, tmpbuf->len, TRUE);
3218
3219       /* Reprocess this packet after received reply from router */
3220       silc_server_command_pending(server, SILC_COMMAND_MOTD,
3221                                   silc_command_get_ident(cmd->payload),
3222                                   silc_server_command_destructor,
3223                                   silc_server_command_motd,
3224                                   silc_server_command_dup(cmd));
3225       cmd->pending = TRUE;
3226       silc_command_set_ident(cmd->payload, old_ident);
3227       silc_buffer_free(tmpbuf);
3228       return;
3229     }
3230
3231     if (!entry) {
3232       silc_server_command_send_status_reply(cmd, SILC_COMMAND_INFO,
3233                                             SILC_STATUS_ERR_NO_SUCH_SERVER);
3234       goto out;
3235     }
3236
3237     idp = silc_id_payload_encode(server->id_entry->id, SILC_ID_SERVER);
3238
3239     if (entry->motd)
3240       packet = silc_command_reply_payload_encode_va(SILC_COMMAND_MOTD,
3241                                                     SILC_STATUS_OK, ident, 2,
3242                                                     2, idp, idp->len,
3243                                                     3, entry->motd,
3244                                                     strlen(entry->motd));
3245     else
3246       packet = silc_command_reply_payload_encode_va(SILC_COMMAND_MOTD,
3247                                                     SILC_STATUS_OK, ident, 1,
3248                                                     2, idp, idp->len);
3249
3250     silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0,
3251                             packet->data, packet->len, FALSE);
3252     silc_buffer_free(packet);
3253     silc_buffer_free(idp);
3254   }
3255
3256  out:
3257   silc_server_command_free(cmd);
3258 }
3259
3260 /* Server side of command UMODE. Client can use this command to set/unset
3261    user mode. Client actually cannot set itself to be as server/router
3262    operator so this can be used only to unset the modes. */
3263
3264 SILC_SERVER_CMD_FUNC(umode)
3265 {
3266   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
3267   SilcServer server = cmd->server;
3268   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
3269   SilcBuffer packet;
3270   unsigned char *tmp_mask;
3271   uint32 mask;
3272   uint16 ident = silc_command_get_ident(cmd->payload);
3273
3274   if (cmd->sock->type != SILC_SOCKET_TYPE_CLIENT)
3275     goto out;
3276
3277   SILC_SERVER_COMMAND_CHECK_ARGC(SILC_COMMAND_UMODE, cmd, 2, 2);
3278
3279   /* Get the client's mode mask */
3280   tmp_mask = silc_argument_get_arg_type(cmd->args, 2, NULL);
3281   if (!tmp_mask) {
3282     silc_server_command_send_status_reply(cmd, SILC_COMMAND_UMODE,
3283                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
3284     goto out;
3285   }
3286   SILC_GET32_MSB(mask, tmp_mask);
3287
3288   /*
3289    * Change the mode
3290    */
3291
3292   if (mask & SILC_UMODE_SERVER_OPERATOR) {
3293     if (!(client->mode & SILC_UMODE_SERVER_OPERATOR)) {
3294       /* Cannot operator mode */
3295       silc_server_command_send_status_reply(cmd, SILC_COMMAND_UMODE,
3296                                             SILC_STATUS_ERR_PERM_DENIED);
3297       goto out;
3298     }
3299   } else {
3300     if (client->mode & SILC_UMODE_SERVER_OPERATOR)
3301       /* Remove the server operator rights */
3302       client->mode &= ~SILC_UMODE_SERVER_OPERATOR;
3303   }
3304
3305   if (mask & SILC_UMODE_ROUTER_OPERATOR) {
3306     if (!(client->mode & SILC_UMODE_ROUTER_OPERATOR)) {
3307       /* Cannot operator mode */
3308       silc_server_command_send_status_reply(cmd, SILC_COMMAND_UMODE,
3309                                             SILC_STATUS_ERR_PERM_DENIED);
3310       goto out;
3311     }
3312   } else {
3313     if (client->mode & SILC_UMODE_ROUTER_OPERATOR)
3314       /* Remove the router operator rights */
3315       client->mode &= ~SILC_UMODE_ROUTER_OPERATOR;
3316   }
3317
3318   if (mask & SILC_UMODE_GONE) {
3319     client->mode |= SILC_UMODE_GONE;
3320   } else {
3321     if (client->mode & SILC_UMODE_GONE)
3322       /* Remove the gone status */
3323       client->mode &= ~SILC_UMODE_GONE;
3324   }
3325
3326   /* Send UMODE change to primary router */
3327   if (!server->standalone)
3328     silc_server_send_notify_umode(server, server->router->connection, TRUE,
3329                                   client->id, client->mode);
3330
3331   /* Send command reply to sender */
3332   packet = silc_command_reply_payload_encode_va(SILC_COMMAND_UMODE,
3333                                                 SILC_STATUS_OK, ident, 1,
3334                                                 2, tmp_mask, 4);
3335   silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0,
3336                           packet->data, packet->len, FALSE);
3337   silc_buffer_free(packet);
3338
3339  out:
3340   silc_server_command_free(cmd);
3341 }
3342
3343 /* Checks that client has rights to add or remove channel modes. If any
3344    of the checks fails FALSE is returned. */
3345
3346 int silc_server_check_cmode_rights(SilcChannelEntry channel,
3347                                    SilcChannelClientEntry client,
3348                                    uint32 mode)
3349 {
3350   int is_op = client->mode & SILC_CHANNEL_UMODE_CHANOP;
3351   int is_fo = client->mode & SILC_CHANNEL_UMODE_CHANFO;
3352
3353   /* Check whether has rights to change anything */
3354   if (!is_op && !is_fo)
3355     return FALSE;
3356
3357   /* Check whether has rights to change everything */
3358   if (is_op && is_fo)
3359     return TRUE;
3360
3361   /* We know that client is channel operator, check that they are not
3362      changing anything that requires channel founder rights. Rest of the
3363      modes are available automatically for channel operator. */
3364
3365   if (mode & SILC_CHANNEL_MODE_PRIVKEY) {
3366     if (is_op && !is_fo)
3367       return FALSE;
3368   } else {
3369     if (channel->mode & SILC_CHANNEL_MODE_PRIVKEY) {
3370       if (is_op && !is_fo)
3371         return FALSE;
3372     }
3373   }
3374
3375   if (mode & SILC_CHANNEL_MODE_PASSPHRASE) {
3376     if (is_op && !is_fo)
3377       return FALSE;
3378   } else {
3379     if (channel->mode & SILC_CHANNEL_MODE_PASSPHRASE) {
3380       if (is_op && !is_fo)
3381         return FALSE;
3382     }
3383   }
3384
3385   if (mode & SILC_CHANNEL_MODE_CIPHER) {
3386     if (is_op && !is_fo)
3387       return FALSE;
3388   } else {
3389     if (channel->mode & SILC_CHANNEL_MODE_CIPHER) {
3390       if (is_op && !is_fo)
3391         return FALSE;
3392     }
3393   }
3394
3395   if (mode & SILC_CHANNEL_MODE_FOUNDER_AUTH) {
3396     if (is_op && !is_fo)
3397       return FALSE;
3398   } else {
3399     if (channel->mode & SILC_CHANNEL_MODE_FOUNDER_AUTH) {
3400       if (is_op && !is_fo)
3401         return FALSE;
3402     }
3403   }
3404
3405   return TRUE;
3406 }
3407
3408 /* Server side command of CMODE. Changes channel mode */
3409
3410 SILC_SERVER_CMD_FUNC(cmode)
3411 {
3412   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
3413   SilcServer server = cmd->server;
3414   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
3415   SilcIDListData idata = (SilcIDListData)client;
3416   SilcChannelID *channel_id;
3417   SilcChannelEntry channel;
3418   SilcChannelClientEntry chl;
3419   SilcBuffer packet, cidp;
3420   unsigned char *tmp, *tmp_id, *tmp_mask;
3421   char *cipher = NULL, *hmac = NULL;
3422   uint32 mode_mask, tmp_len, tmp_len2;
3423   uint16 ident = silc_command_get_ident(cmd->payload);
3424
3425   SILC_SERVER_COMMAND_CHECK_ARGC(SILC_COMMAND_CMODE, cmd, 2, 7);
3426
3427   /* Get Channel ID */
3428   tmp_id = silc_argument_get_arg_type(cmd->args, 1, &tmp_len2);
3429   if (!tmp_id) {
3430     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3431                                           SILC_STATUS_ERR_NO_CHANNEL_ID);
3432     goto out;
3433   }
3434   channel_id = silc_id_payload_parse_id(tmp_id, tmp_len2);
3435   if (!channel_id) {
3436     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3437                                           SILC_STATUS_ERR_NO_CHANNEL_ID);
3438     goto out;
3439   }
3440
3441   /* Get the channel mode mask */
3442   tmp_mask = silc_argument_get_arg_type(cmd->args, 2, &tmp_len);
3443   if (!tmp_mask) {
3444     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3445                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
3446     goto out;
3447   }
3448   SILC_GET32_MSB(mode_mask, tmp_mask);
3449
3450   /* Get channel entry */
3451   channel = silc_idlist_find_channel_by_id(server->local_list,
3452                                            channel_id, NULL);
3453   if (!channel) {
3454     channel = silc_idlist_find_channel_by_id(server->global_list,
3455                                              channel_id, NULL);
3456     if (!channel) {
3457       silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3458                                             SILC_STATUS_ERR_NO_SUCH_CHANNEL);
3459       goto out;
3460     }
3461   }
3462
3463   /* Check whether this client is on the channel */
3464   if (!silc_server_client_on_channel(client, channel)) {
3465     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3466                                           SILC_STATUS_ERR_NOT_ON_CHANNEL);
3467     goto out;
3468   }
3469
3470   /* Get entry to the channel user list */
3471   silc_hash_table_find(channel->user_list, client, NULL, (void *)&chl);
3472
3473   /* Check that client has rights to change any requested channel modes */
3474   if (!silc_server_check_cmode_rights(channel, chl, mode_mask)) {
3475     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3476                                           SILC_STATUS_ERR_NO_CHANNEL_PRIV);
3477     goto out;
3478   }
3479
3480   /*
3481    * Check the modes. Modes that requires nothing special operation are
3482    * not checked here.
3483    */
3484
3485   if (mode_mask & SILC_CHANNEL_MODE_PRIVKEY) {
3486     /* Channel uses private keys to protect traffic. Client(s) has set the
3487        key locally they want to use, server does not know that key. */
3488     /* Nothing interesting to do here */
3489   } else {
3490     if (channel->mode & SILC_CHANNEL_MODE_PRIVKEY) {
3491       /* The mode is removed and we need to generate and distribute
3492          new channel key. Clients are not using private channel keys
3493          anymore after this. */
3494
3495       /* Re-generate channel key */
3496       silc_server_create_channel_key(server, channel, 0);
3497
3498       /* Send the channel key. This sends it to our local clients and if
3499          we are normal server to our router as well. */
3500       silc_server_send_channel_key(server, NULL, channel,
3501                                    server->server_type == SILC_ROUTER ?
3502                                    FALSE : !server->standalone);
3503
3504       cipher = channel->channel_key->cipher->name;
3505       hmac = channel->hmac->hmac->name;
3506     }
3507   }
3508
3509   if (mode_mask & SILC_CHANNEL_MODE_ULIMIT) {
3510     /* User limit is set on channel */
3511     uint32 user_limit;
3512
3513     /* Get user limit */
3514     tmp = silc_argument_get_arg_type(cmd->args, 3, NULL);
3515     if (!tmp) {
3516       if (!(channel->mode & SILC_CHANNEL_MODE_ULIMIT)) {
3517         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3518                                    SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
3519         goto out;
3520       }
3521     } else {
3522       SILC_GET32_MSB(user_limit, tmp);
3523       channel->user_limit = user_limit;
3524     }
3525   } else {
3526     if (channel->mode & SILC_CHANNEL_MODE_ULIMIT)
3527       /* User limit mode is unset. Remove user limit */
3528       channel->user_limit = 0;
3529   }
3530
3531   if (mode_mask & SILC_CHANNEL_MODE_PASSPHRASE) {
3532     if (!(channel->mode & SILC_CHANNEL_MODE_PASSPHRASE)) {
3533       /* Passphrase has been set to channel */
3534
3535       /* Get the passphrase */
3536       tmp = silc_argument_get_arg_type(cmd->args, 4, NULL);
3537       if (!tmp) {
3538         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3539                                    SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
3540         goto out;
3541       }
3542
3543       /* Save the passphrase */
3544       channel->passphrase = strdup(tmp);
3545     }
3546   } else {
3547     if (channel->mode & SILC_CHANNEL_MODE_PASSPHRASE) {
3548       /* Passphrase mode is unset. remove the passphrase */
3549       if (channel->passphrase) {
3550         silc_free(channel->passphrase);
3551         channel->passphrase = NULL;
3552       }
3553     }
3554   }
3555
3556   if (mode_mask & SILC_CHANNEL_MODE_CIPHER) {
3557     if (!(channel->mode & SILC_CHANNEL_MODE_CIPHER)) {
3558       /* Cipher to use protect the traffic */
3559
3560       /* Get cipher */
3561       cipher = silc_argument_get_arg_type(cmd->args, 5, NULL);
3562       if (!cipher) {
3563         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3564                                    SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
3565         goto out;
3566       }
3567
3568       /* Delete old cipher and allocate the new one */
3569       silc_cipher_free(channel->channel_key);
3570       if (!silc_cipher_alloc(cipher, &channel->channel_key)) {
3571         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3572                                        SILC_STATUS_ERR_UNKNOWN_ALGORITHM);
3573         goto out;
3574       }
3575
3576       /* Re-generate channel key */
3577       silc_server_create_channel_key(server, channel, 0);
3578
3579       /* Send the channel key. This sends it to our local clients and if
3580          we are normal server to our router as well. */
3581       silc_server_send_channel_key(server, NULL, channel,
3582                                    server->server_type == SILC_ROUTER ?
3583                                    FALSE : !server->standalone);
3584     }
3585   } else {
3586     if (channel->mode & SILC_CHANNEL_MODE_CIPHER) {
3587       /* Cipher mode is unset. Remove the cipher and revert back to
3588          default cipher */
3589       cipher = channel->cipher;
3590
3591       /* Delete old cipher and allocate default one */
3592       silc_cipher_free(channel->channel_key);
3593       if (!silc_cipher_alloc(cipher ? cipher : "aes-256-cbc",
3594                              &channel->channel_key)) {
3595         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3596                                    SILC_STATUS_ERR_UNKNOWN_ALGORITHM);
3597         goto out;
3598       }
3599
3600       /* Re-generate channel key */
3601       silc_server_create_channel_key(server, channel, 0);
3602
3603       /* Send the channel key. This sends it to our local clients and if
3604          we are normal server to our router as well. */
3605       silc_server_send_channel_key(server, NULL, channel,
3606                                    server->server_type == SILC_ROUTER ?
3607                                    FALSE : !server->standalone);
3608     }
3609   }
3610
3611   if (mode_mask & SILC_CHANNEL_MODE_HMAC) {
3612     if (!(channel->mode & SILC_CHANNEL_MODE_HMAC)) {
3613       /* HMAC to use protect the traffic */
3614       unsigned char hash[32];
3615
3616       /* Get hmac */
3617       hmac = silc_argument_get_arg_type(cmd->args, 6, NULL);
3618       if (!hmac) {
3619         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3620                                    SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
3621         goto out;
3622       }
3623
3624       /* Delete old hmac and allocate the new one */
3625       silc_hmac_free(channel->hmac);
3626       if (!silc_hmac_alloc(hmac, NULL, &channel->hmac)) {
3627         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3628                                        SILC_STATUS_ERR_UNKNOWN_ALGORITHM);
3629         goto out;
3630       }
3631
3632       /* Set the HMAC key out of current channel key. The client must do
3633          this locally. */
3634       silc_hash_make(channel->hmac->hash, channel->key, channel->key_len / 8,
3635                      hash);
3636       silc_hmac_set_key(channel->hmac, hash,
3637                         silc_hash_len(channel->hmac->hash));
3638       memset(hash, 0, sizeof(hash));
3639     }
3640   } else {
3641     if (channel->mode & SILC_CHANNEL_MODE_HMAC) {
3642       /* Hmac mode is unset. Remove the hmac and revert back to
3643          default hmac */
3644       unsigned char hash[32];
3645       hmac = channel->hmac_name;
3646
3647       /* Delete old hmac and allocate default one */
3648       silc_hmac_free(channel->hmac);
3649       if (!silc_hmac_alloc(hmac ? hmac : "hmac-sha1-96", NULL,
3650                            &channel->hmac)) {
3651         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3652                                        SILC_STATUS_ERR_UNKNOWN_ALGORITHM);
3653         goto out;
3654       }
3655
3656       /* Set the HMAC key out of current channel key. The client must do
3657          this locally. */
3658       silc_hash_make(channel->hmac->hash, channel->key, channel->key_len / 8,
3659                      hash);
3660       silc_hmac_set_key(channel->hmac, hash,
3661                         silc_hash_len(channel->hmac->hash));
3662       memset(hash, 0, sizeof(hash));
3663     }
3664   }
3665
3666   if (mode_mask & SILC_CHANNEL_MODE_FOUNDER_AUTH) {
3667     if (chl->mode & SILC_CHANNEL_UMODE_CHANFO) {
3668       if (!(channel->mode & SILC_CHANNEL_MODE_FOUNDER_AUTH)) {
3669         /* Set the founder authentication */
3670         SilcAuthPayload auth;
3671
3672         tmp = silc_argument_get_arg_type(cmd->args, 7, &tmp_len);
3673         if (!tmp) {
3674           silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3675                                      SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
3676           goto out;
3677         }
3678
3679         auth = silc_auth_payload_parse(tmp, tmp_len);
3680         if (!auth) {
3681           silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE,
3682                                      SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
3683           goto out;
3684         }
3685
3686         /* Save the public key */
3687         tmp = silc_pkcs_public_key_encode(idata->public_key, &tmp_len);
3688         silc_pkcs_public_key_decode(tmp, tmp_len, &channel->founder_key);
3689         silc_free(tmp);
3690
3691         channel->founder_method = silc_auth_get_method(auth);
3692
3693         if (channel->founder_method == SILC_AUTH_PASSWORD) {
3694           tmp = silc_auth_get_data(auth, &tmp_len);
3695           channel->founder_passwd =
3696             silc_calloc(tmp_len + 1, sizeof(*channel->founder_passwd));
3697           memcpy(channel->founder_passwd, tmp, tmp_len);
3698           channel->founder_passwd_len = tmp_len;
3699         }
3700
3701         silc_auth_payload_free(auth);
3702       }
3703     }
3704   } else {
3705     if (chl->mode & SILC_CHANNEL_UMODE_CHANFO) {
3706       if (channel->mode & SILC_CHANNEL_MODE_FOUNDER_AUTH) {
3707         if (channel->founder_key)
3708           silc_pkcs_public_key_free(channel->founder_key);
3709         if (channel->founder_passwd) {
3710           silc_free(channel->founder_passwd);
3711           channel->founder_passwd = NULL;
3712         }
3713       }
3714     }
3715   }
3716
3717   /* Finally, set the mode */
3718   channel->mode = mode_mask;
3719
3720   /* Send CMODE_CHANGE notify */
3721   cidp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
3722   silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
3723                                      SILC_NOTIFY_TYPE_CMODE_CHANGE, 4,
3724                                      cidp->data, cidp->len,
3725                                      tmp_mask, 4,
3726                                      cipher, cipher ? strlen(cipher) : 0,
3727                                      hmac, hmac ? strlen(hmac) : 0);
3728
3729   /* Set CMODE notify type to network */
3730   if (!server->standalone)
3731     silc_server_send_notify_cmode(server, server->router->connection,
3732                                   server->server_type == SILC_ROUTER ?
3733                                   TRUE : FALSE, channel,
3734                                   mode_mask, client->id, SILC_ID_CLIENT,
3735                                   cipher, hmac);
3736
3737   /* Send command reply to sender */
3738   packet = silc_command_reply_payload_encode_va(SILC_COMMAND_CMODE,
3739                                                 SILC_STATUS_OK, ident, 1,
3740                                                 2, tmp_mask, 4);
3741   silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0,
3742                           packet->data, packet->len, FALSE);
3743
3744   silc_buffer_free(packet);
3745   silc_free(channel_id);
3746   silc_free(cidp);
3747
3748  out:
3749   silc_server_command_free(cmd);
3750 }
3751
3752 /* Server side of CUMODE command. Changes client's mode on a channel. */
3753
3754 SILC_SERVER_CMD_FUNC(cumode)
3755 {
3756   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
3757   SilcServer server = cmd->server;
3758   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
3759   SilcIDListData idata = (SilcIDListData)client;
3760   SilcChannelID *channel_id;
3761   SilcClientID *client_id;
3762   SilcChannelEntry channel;
3763   SilcClientEntry target_client;
3764   SilcChannelClientEntry chl;
3765   SilcBuffer packet, idp;
3766   unsigned char *tmp_id, *tmp_ch_id, *tmp_mask;
3767   uint32 target_mask, sender_mask = 0, tmp_len, tmp_ch_len;
3768   int notify = FALSE;
3769   uint16 ident = silc_command_get_ident(cmd->payload);
3770
3771   SILC_SERVER_COMMAND_CHECK_ARGC(SILC_COMMAND_CUMODE, cmd, 3, 4);
3772
3773   /* Get Channel ID */
3774   tmp_ch_id = silc_argument_get_arg_type(cmd->args, 1, &tmp_ch_len);
3775   if (!tmp_ch_id) {
3776     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3777                                           SILC_STATUS_ERR_NO_CHANNEL_ID);
3778     goto out;
3779   }
3780   channel_id = silc_id_payload_parse_id(tmp_ch_id, tmp_ch_len);
3781   if (!channel_id) {
3782     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3783                                           SILC_STATUS_ERR_NO_CHANNEL_ID);
3784     goto out;
3785   }
3786
3787   /* Get channel entry */
3788   channel = silc_idlist_find_channel_by_id(server->local_list,
3789                                            channel_id, NULL);
3790   if (!channel) {
3791     channel = silc_idlist_find_channel_by_id(server->global_list,
3792                                              channel_id, NULL);
3793     if (!channel) {
3794       silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3795                                             SILC_STATUS_ERR_NO_SUCH_CHANNEL);
3796       goto out;
3797     }
3798   }
3799
3800   /* Check whether sender is on the channel */
3801   if (!silc_server_client_on_channel(client, channel)) {
3802     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3803                                           SILC_STATUS_ERR_NOT_ON_CHANNEL);
3804     goto out;
3805   }
3806
3807   /* Check that client has rights to change other's rights */
3808   silc_hash_table_find(channel->user_list, client, NULL, (void *)&chl);
3809   sender_mask = chl->mode;
3810
3811   /* Get the target client's channel mode mask */
3812   tmp_mask = silc_argument_get_arg_type(cmd->args, 2, NULL);
3813   if (!tmp_mask) {
3814     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3815                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
3816     goto out;
3817   }
3818   SILC_GET32_MSB(target_mask, tmp_mask);
3819
3820   /* Get target Client ID */
3821   tmp_id = silc_argument_get_arg_type(cmd->args, 3, &tmp_len);
3822   if (!tmp_id) {
3823     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3824                                           SILC_STATUS_ERR_NO_CLIENT_ID);
3825     goto out;
3826   }
3827   client_id = silc_id_payload_parse_id(tmp_id, tmp_len);
3828   if (!client_id) {
3829     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3830                                           SILC_STATUS_ERR_NO_CLIENT_ID);
3831     goto out;
3832   }
3833
3834   /* Get target client's entry */
3835   target_client = silc_idlist_find_client_by_id(server->local_list,
3836                                                 client_id, NULL);
3837   if (!target_client) {
3838     target_client = silc_idlist_find_client_by_id(server->global_list,
3839                                                   client_id, NULL);
3840   }
3841
3842   if (target_client != client &&
3843       !(sender_mask & SILC_CHANNEL_UMODE_CHANFO) &&
3844       !(sender_mask & SILC_CHANNEL_UMODE_CHANOP)) {
3845     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3846                                           SILC_STATUS_ERR_NO_CHANNEL_PRIV);
3847     goto out;
3848   }
3849
3850   /* Check whether target client is on the channel */
3851   if (target_client != client) {
3852     if (!silc_server_client_on_channel(target_client, channel)) {
3853       silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3854                                  SILC_STATUS_ERR_USER_NOT_ON_CHANNEL);
3855       goto out;
3856     }
3857
3858     /* Get entry to the channel user list */
3859     silc_hash_table_find(channel->user_list, target_client, NULL,
3860                          (void *)&chl);
3861   }
3862
3863   /*
3864    * Change the mode
3865    */
3866
3867   /* If the target client is founder, no one else can change their mode
3868      but themselves. */
3869   if (chl->mode & SILC_CHANNEL_UMODE_CHANFO && chl->client != target_client) {
3870     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3871                                           SILC_STATUS_ERR_NOT_YOU);
3872     goto out;
3873   }
3874
3875   if (target_mask & SILC_CHANNEL_UMODE_CHANFO) {
3876     /* The client tries to claim the founder rights. */
3877     unsigned char *tmp_auth;
3878     uint32 tmp_auth_len, auth_len;
3879     void *auth;
3880
3881     if (target_client != client) {
3882       silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3883                                             SILC_STATUS_ERR_NOT_YOU);
3884       goto out;
3885     }
3886
3887     if (!(channel->mode & SILC_CHANNEL_MODE_FOUNDER_AUTH) ||
3888         !channel->founder_key) {
3889       silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3890                                             SILC_STATUS_ERR_NOT_YOU);
3891       goto out;
3892     }
3893
3894     tmp_auth = silc_argument_get_arg_type(cmd->args, 4, &tmp_auth_len);
3895     if (!tmp_auth) {
3896       silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3897                                             SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
3898       goto out;
3899     }
3900
3901     auth = (channel->founder_method == SILC_AUTH_PASSWORD ?
3902             (void *)channel->founder_passwd : (void *)channel->founder_key);
3903     auth_len = (channel->founder_method == SILC_AUTH_PASSWORD ?
3904                 channel->founder_passwd_len : 0);
3905
3906     if (!silc_auth_verify_data(tmp_auth, tmp_auth_len,
3907                                channel->founder_method, auth, auth_len,
3908                                idata->hash, client->id, SILC_ID_CLIENT)) {
3909       silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3910                                             SILC_STATUS_ERR_AUTH_FAILED);
3911       goto out;
3912     }
3913
3914     sender_mask = chl->mode |= SILC_CHANNEL_UMODE_CHANFO;
3915     notify = TRUE;
3916   } else {
3917     if (chl->mode & SILC_CHANNEL_UMODE_CHANFO) {
3918       if (target_client == client) {
3919         /* Remove channel founder rights from itself */
3920         chl->mode &= ~SILC_CHANNEL_UMODE_CHANFO;
3921         notify = TRUE;
3922       } else {
3923         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3924                                               SILC_STATUS_ERR_NOT_YOU);
3925         goto out;
3926       }
3927     }
3928   }
3929
3930   if (target_mask & SILC_CHANNEL_UMODE_CHANOP) {
3931     /* Promote to operator */
3932     if (!(chl->mode & SILC_CHANNEL_UMODE_CHANOP)) {
3933       if (!(sender_mask & SILC_CHANNEL_UMODE_CHANOP) &&
3934           !(sender_mask & SILC_CHANNEL_UMODE_CHANFO)) {
3935         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3936                                               SILC_STATUS_ERR_NO_CHANNEL_PRIV);
3937         goto out;
3938       }
3939
3940       chl->mode |= SILC_CHANNEL_UMODE_CHANOP;
3941       notify = TRUE;
3942     }
3943   } else {
3944     if (chl->mode & SILC_CHANNEL_UMODE_CHANOP) {
3945       if (!(sender_mask & SILC_CHANNEL_UMODE_CHANOP) &&
3946           !(sender_mask & SILC_CHANNEL_UMODE_CHANFO)) {
3947         silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE,
3948                                               SILC_STATUS_ERR_NO_CHANNEL_PRIV);
3949         goto out;
3950       }
3951
3952       /* Demote to normal user */
3953       chl->mode &= ~SILC_CHANNEL_UMODE_CHANOP;
3954       notify = TRUE;
3955     }
3956   }
3957
3958   idp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
3959   tmp_id = silc_argument_get_arg_type(cmd->args, 3, &tmp_len);
3960
3961   /* Send notify to channel, notify only if mode was actually changed. */
3962   if (notify) {
3963     silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
3964                                        SILC_NOTIFY_TYPE_CUMODE_CHANGE, 3,
3965                                        idp->data, idp->len,
3966                                        tmp_mask, 4,
3967                                        tmp_id, tmp_len);
3968
3969     /* Set CUMODE notify type to network */
3970     if (!server->standalone)
3971       silc_server_send_notify_cumode(server, server->router->connection,
3972                                      server->server_type == SILC_ROUTER ?
3973                                      TRUE : FALSE, channel,
3974                                      target_mask, client->id,
3975                                      SILC_ID_CLIENT,
3976                                      target_client->id);
3977   }
3978
3979   /* Send command reply to sender */
3980   packet = silc_command_reply_payload_encode_va(SILC_COMMAND_CUMODE,
3981                                                 SILC_STATUS_OK, ident, 2,
3982                                                 2, tmp_mask, 4,
3983                                                 3, tmp_id, tmp_len);
3984   silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0,
3985                           packet->data, packet->len, FALSE);
3986
3987   silc_buffer_free(packet);
3988   silc_free(channel_id);
3989   silc_free(client_id);
3990   silc_buffer_free(idp);
3991
3992  out:
3993   silc_server_command_free(cmd);
3994 }
3995
3996 /* Server side of KICK command. Kicks client out of channel. */
3997
3998 SILC_SERVER_CMD_FUNC(kick)
3999 {
4000   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
4001   SilcServer server = cmd->server;
4002   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
4003   SilcClientEntry target_client;
4004   SilcChannelID *channel_id;
4005   SilcClientID *client_id;
4006   SilcChannelEntry channel;
4007   SilcChannelClientEntry chl;
4008   SilcBuffer idp;
4009   uint32 tmp_len;
4010   unsigned char *tmp, *comment;
4011
4012   SILC_SERVER_COMMAND_CHECK_ARGC(SILC_COMMAND_LEAVE, cmd, 1, 3);
4013
4014   /* Get Channel ID */
4015   tmp = silc_argument_get_arg_type(cmd->args, 1, &tmp_len);
4016   if (!tmp) {
4017     silc_server_command_send_status_reply(cmd, SILC_COMMAND_KICK,
4018                                           SILC_STATUS_ERR_NO_CHANNEL_ID);
4019     goto out;
4020   }
4021   channel_id = silc_id_payload_parse_id(tmp, tmp_len);
4022   if (!channel_id) {
4023     silc_server_command_send_status_reply(cmd, SILC_COMMAND_KICK,
4024                                           SILC_STATUS_ERR_NO_CHANNEL_ID);
4025     goto out;
4026   }
4027
4028   /* Get channel entry */
4029   channel = silc_idlist_find_channel_by_id(server->local_list,
4030                                            channel_id, NULL);
4031   if (!channel) {
4032     channel = silc_idlist_find_channel_by_id(server->local_list,
4033                                              channel_id, NULL);
4034     if (!channel) {
4035       silc_server_command_send_status_reply(cmd, SILC_COMMAND_KICK,
4036                                             SILC_STATUS_ERR_NO_SUCH_CHANNEL);
4037       goto out;
4038     }
4039   }
4040
4041   /* Check whether sender is on the channel */
4042   if (!silc_server_client_on_channel(client, channel)) {
4043     silc_server_command_send_status_reply(cmd, SILC_COMMAND_KICK,
4044                                           SILC_STATUS_ERR_NOT_ON_CHANNEL);
4045     goto out;
4046   }
4047
4048   /* Check that the kicker is channel operator or channel founder */
4049   silc_hash_table_find(channel->user_list, client, NULL, (void *)&chl);
4050   if (chl->mode == SILC_CHANNEL_UMODE_NONE) {
4051     silc_server_command_send_status_reply(cmd, SILC_COMMAND_KICK,
4052                                           SILC_STATUS_ERR_NO_CHANNEL_PRIV);
4053     goto out;
4054   }
4055
4056   /* Get target Client ID */
4057   tmp = silc_argument_get_arg_type(cmd->args, 2, &tmp_len);
4058   if (!tmp) {
4059     silc_server_command_send_status_reply(cmd, SILC_COMMAND_KICK,
4060                                           SILC_STATUS_ERR_NO_CLIENT_ID);
4061     goto out;
4062   }
4063   client_id = silc_id_payload_parse_id(tmp, tmp_len);
4064   if (!client_id) {
4065     silc_server_command_send_status_reply(cmd, SILC_COMMAND_KICK,
4066                                           SILC_STATUS_ERR_NO_CLIENT_ID);
4067     goto out;
4068   }
4069
4070   /* Get target client's entry */
4071   target_client = silc_idlist_find_client_by_id(server->local_list,
4072                                                 client_id, NULL);
4073   if (!target_client) {
4074     target_client = silc_idlist_find_client_by_id(server->global_list,
4075                                                   client_id, NULL);
4076   }
4077
4078   /* Check that the target client is not channel founder. Channel founder
4079      cannot be kicked from the channel. */
4080   silc_hash_table_find(channel->user_list, target_client, NULL, (void *)&chl);
4081   if (chl->mode & SILC_CHANNEL_UMODE_CHANFO) {
4082     silc_server_command_send_status_reply(cmd, SILC_COMMAND_KICK,
4083                                           SILC_STATUS_ERR_NO_CHANNEL_FOPRIV);
4084     goto out;
4085   }
4086
4087   /* Check whether target client is on the channel */
4088   if (!silc_server_client_on_channel(target_client, channel)) {
4089     silc_server_command_send_status_reply(cmd, SILC_COMMAND_KICK,
4090                                           SILC_STATUS_ERR_USER_NOT_ON_CHANNEL);
4091     goto out;
4092   }
4093
4094   /* Get comment */
4095   tmp_len = 0;
4096   comment = silc_argument_get_arg_type(cmd->args, 3, &tmp_len);
4097   if (tmp_len > 128)
4098     comment = NULL;
4099
4100   /* Send command reply to sender */
4101   silc_server_command_send_status_reply(cmd, SILC_COMMAND_KICK,
4102                                         SILC_STATUS_OK);
4103
4104   /* Send KICKED notify to local clients on the channel */
4105   idp = silc_id_payload_encode(target_client->id, SILC_ID_CLIENT);
4106   silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
4107                                      SILC_NOTIFY_TYPE_KICKED,
4108                                      comment ? 2 : 1,
4109                                      idp->data, idp->len,
4110                                      comment, comment ? strlen(comment) : 0);
4111   silc_buffer_free(idp);
4112
4113   /* Remove the client from the channel. If the channel does not exist
4114      after removing the client then the client kicked itself off the channel
4115      and we don't have to send anything after that. */
4116   if (!silc_server_remove_from_one_channel(server, NULL, channel,
4117                                            target_client, FALSE))
4118     goto out;
4119
4120   /* Send KICKED notify to primary route */
4121   if (!server->standalone)
4122     silc_server_send_notify_kicked(server, server->router->connection,
4123                                    server->server_type == SILC_ROUTER ?
4124                                    TRUE : FALSE, channel,
4125                                    target_client->id, comment);
4126
4127   if (!(channel->mode & SILC_CHANNEL_MODE_PRIVKEY)) {
4128     /* Re-generate channel key */
4129     silc_server_create_channel_key(server, channel, 0);
4130
4131     /* Send the channel key to the channel. The key of course is not sent
4132        to the client who was kicked off the channel. */
4133     silc_server_send_channel_key(server, target_client->connection, channel,
4134                                  server->server_type == SILC_ROUTER ?
4135                                  FALSE : !server->standalone);
4136   }
4137
4138  out:
4139   silc_server_command_free(cmd);
4140 }
4141
4142 /* Server side of OPER command. Client uses this comand to obtain server
4143    operator privileges to this server/router. */
4144
4145 SILC_SERVER_CMD_FUNC(oper)
4146 {
4147   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
4148   SilcServer server = cmd->server;
4149   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
4150   unsigned char *username, *auth;
4151   uint32 tmp_len;
4152   SilcServerConfigSectionAdminConnection *admin;
4153   SilcIDListData idata = (SilcIDListData)client;
4154
4155   SILC_SERVER_COMMAND_CHECK_ARGC(SILC_COMMAND_OPER, cmd, 1, 2);
4156
4157   if (!client || cmd->sock->type != SILC_SOCKET_TYPE_CLIENT)
4158     goto out;
4159
4160   /* Get the username */
4161   username = silc_argument_get_arg_type(cmd->args, 1, &tmp_len);
4162   if (!username) {
4163     silc_server_command_send_status_reply(cmd, SILC_COMMAND_OPER,
4164                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
4165     goto out;
4166   }
4167
4168   /* Get the admin configuration */
4169   admin = silc_server_config_find_admin(server->config, cmd->sock->ip,
4170                                         username, client->nickname);
4171   if (!admin) {
4172     admin = silc_server_config_find_admin(server->config, cmd->sock->hostname,
4173                                           username, client->nickname);
4174     if (!admin) {
4175       silc_server_command_send_status_reply(cmd, SILC_COMMAND_OPER,
4176                                             SILC_STATUS_ERR_AUTH_FAILED);
4177       goto out;
4178     }
4179   }
4180
4181   /* Get the authentication payload */
4182   auth = silc_argument_get_arg_type(cmd->args, 2, &tmp_len);
4183   if (!auth) {
4184     silc_server_command_send_status_reply(cmd, SILC_COMMAND_OPER,
4185                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
4186     goto out;
4187   }
4188
4189   /* Verify the authentication data */
4190   if (!silc_auth_verify_data(auth, tmp_len, admin->auth_meth,
4191                              admin->auth_data, admin->auth_data_len,
4192                              idata->hash, client->id, SILC_ID_CLIENT)) {
4193     silc_server_command_send_status_reply(cmd, SILC_COMMAND_OPER,
4194                                           SILC_STATUS_ERR_AUTH_FAILED);
4195     goto out;
4196   }
4197
4198   /* Client is now server operator */
4199   client->mode |= SILC_UMODE_SERVER_OPERATOR;
4200
4201   /* Send UMODE change to primary router */
4202   if (!server->standalone)
4203     silc_server_send_notify_umode(server, server->router->connection, TRUE,
4204                                   client->id, client->mode);
4205
4206   /* Send reply to the sender */
4207   silc_server_command_send_status_reply(cmd, SILC_COMMAND_OPER,
4208                                         SILC_STATUS_OK);
4209
4210  out:
4211   silc_server_command_free(cmd);
4212 }
4213
4214 /* Server side of SILCOPER command. Client uses this comand to obtain router
4215    operator privileges to this router. */
4216
4217 SILC_SERVER_CMD_FUNC(silcoper)
4218 {
4219   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
4220   SilcServer server = cmd->server;
4221   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
4222   unsigned char *username, *auth;
4223   uint32 tmp_len;
4224   SilcServerConfigSectionAdminConnection *admin;
4225   SilcIDListData idata = (SilcIDListData)client;
4226
4227   SILC_SERVER_COMMAND_CHECK_ARGC(SILC_COMMAND_SILCOPER, cmd, 1, 2);
4228
4229   if (server->server_type == SILC_SERVER)
4230     goto out;
4231
4232   if (!client || cmd->sock->type != SILC_SOCKET_TYPE_CLIENT)
4233     goto out;
4234
4235   /* Get the username */
4236   username = silc_argument_get_arg_type(cmd->args, 1, &tmp_len);
4237   if (!username) {
4238     silc_server_command_send_status_reply(cmd, SILC_COMMAND_SILCOPER,
4239                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
4240     goto out;
4241   }
4242
4243   /* Get the admin configuration */
4244   admin = silc_server_config_find_admin(server->config, cmd->sock->ip,
4245                                         username, client->nickname);
4246   if (!admin) {
4247     admin = silc_server_config_find_admin(server->config, cmd->sock->hostname,
4248                                           username, client->nickname);
4249     if (!admin) {
4250       silc_server_command_send_status_reply(cmd, SILC_COMMAND_SILCOPER,
4251                                             SILC_STATUS_ERR_AUTH_FAILED);
4252       goto out;
4253     }
4254   }
4255
4256   /* Get the authentication payload */
4257   auth = silc_argument_get_arg_type(cmd->args, 2, &tmp_len);
4258   if (!auth) {
4259     silc_server_command_send_status_reply(cmd, SILC_COMMAND_SILCOPER,
4260                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
4261     goto out;
4262   }
4263
4264   /* Verify the authentication data */
4265   if (!silc_auth_verify_data(auth, tmp_len, admin->auth_meth,
4266                              admin->auth_data, admin->auth_data_len,
4267                              idata->hash, client->id, SILC_ID_CLIENT)) {
4268     silc_server_command_send_status_reply(cmd, SILC_COMMAND_SILCOPER,
4269                                           SILC_STATUS_ERR_AUTH_FAILED);
4270     goto out;
4271   }
4272
4273   /* Client is now router operator */
4274   client->mode |= SILC_UMODE_ROUTER_OPERATOR;
4275
4276   /* Send UMODE change to primary router */
4277   if (!server->standalone)
4278     silc_server_send_notify_umode(server, server->router->connection, TRUE,
4279                                   client->id, client->mode);
4280
4281   /* Send reply to the sender */
4282   silc_server_command_send_status_reply(cmd, SILC_COMMAND_SILCOPER,
4283                                         SILC_STATUS_OK);
4284
4285  out:
4286   silc_server_command_free(cmd);
4287 }
4288
4289 /* Server side command of CONNECT. Connects us to the specified remote
4290    server or router. */
4291
4292 SILC_SERVER_CMD_FUNC(connect)
4293 {
4294   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
4295   SilcServer server = cmd->server;
4296   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
4297   unsigned char *tmp, *host;
4298   uint32 tmp_len;
4299   uint32 port = SILC_PORT;
4300
4301   SILC_SERVER_COMMAND_CHECK_ARGC(SILC_COMMAND_CONNECT, cmd, 1, 2);
4302
4303   if (!client || cmd->sock->type != SILC_SOCKET_TYPE_CLIENT)
4304     goto out;
4305
4306   /* Check whether client has the permissions. */
4307   if (client->mode == SILC_UMODE_NONE) {
4308     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CONNECT,
4309                                           SILC_STATUS_ERR_NO_SERVER_PRIV);
4310     goto out;
4311   }
4312
4313   if (server->server_type == SILC_ROUTER &&
4314       client->mode & SILC_UMODE_SERVER_OPERATOR) {
4315     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CONNECT,
4316                                           SILC_STATUS_ERR_NO_ROUTER_PRIV);
4317     goto out;
4318   }
4319
4320   /* Get the remote server */
4321   host = silc_argument_get_arg_type(cmd->args, 1, &tmp_len);
4322   if (!host) {
4323     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CONNECT,
4324                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
4325     goto out;
4326   }
4327
4328   /* Get port */
4329   tmp = silc_argument_get_arg_type(cmd->args, 2, &tmp_len);
4330   if (tmp)
4331     SILC_GET32_MSB(port, tmp);
4332
4333   /* Create the connection. It is done with timeout and is async. */
4334   silc_server_create_connection(server, host, port);
4335
4336   /* Send reply to the sender */
4337   silc_server_command_send_status_reply(cmd, SILC_COMMAND_CONNECT,
4338                                         SILC_STATUS_OK);
4339
4340  out:
4341   silc_server_command_free(cmd);
4342 }
4343
4344 /* Server side of command BAN. This is used to manage the ban list of the
4345    channel. To add clients and remove clients from the ban list. */
4346
4347 SILC_SERVER_CMD_FUNC(ban)
4348 {
4349   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
4350   SilcServer server = cmd->server;
4351   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
4352   SilcBuffer packet;
4353   SilcChannelEntry channel;
4354   SilcChannelClientEntry chl;
4355   SilcChannelID *channel_id = NULL;
4356   unsigned char *id, *add, *del;
4357   uint32 id_len, tmp_len;
4358   uint16 ident = silc_command_get_ident(cmd->payload);
4359
4360   if (cmd->sock->type != SILC_SOCKET_TYPE_CLIENT)
4361     goto out;
4362
4363   SILC_SERVER_COMMAND_CHECK_ARGC(SILC_COMMAND_BAN, cmd, 0, 3);
4364
4365   /* Get Channel ID */
4366   id = silc_argument_get_arg_type(cmd->args, 1, &id_len);
4367   if (id) {
4368     channel_id = silc_id_payload_parse_id(id, id_len);
4369     if (!channel_id) {
4370       silc_server_command_send_status_reply(cmd, SILC_COMMAND_BAN,
4371                                             SILC_STATUS_ERR_NO_CHANNEL_ID);
4372       goto out;
4373     }
4374   }
4375
4376   /* Get channel entry. The server must know about the channel since the
4377      client is expected to be on the channel. */
4378   channel = silc_idlist_find_channel_by_id(server->local_list,
4379                                            channel_id, NULL);
4380   if (!channel) {
4381     channel = silc_idlist_find_channel_by_id(server->global_list,
4382                                              channel_id, NULL);
4383     if (!channel) {
4384       silc_server_command_send_status_reply(cmd, SILC_COMMAND_BAN,
4385                                             SILC_STATUS_ERR_NO_SUCH_CHANNEL);
4386       goto out;
4387     }
4388   }
4389
4390   /* Check whether this client is on the channel */
4391   if (!silc_server_client_on_channel(client, channel)) {
4392     silc_server_command_send_status_reply(cmd, SILC_COMMAND_BAN,
4393                                           SILC_STATUS_ERR_NOT_ON_CHANNEL);
4394     goto out;
4395   }
4396
4397   /* Get entry to the channel user list */
4398   silc_hash_table_find(channel->user_list, client, NULL, (void *)&chl);
4399
4400   /* The client must be at least channel operator. */
4401   if (!(chl->mode & SILC_CHANNEL_UMODE_CHANOP)) {
4402     silc_server_command_send_status_reply(cmd, SILC_COMMAND_BAN,
4403                                           SILC_STATUS_ERR_NO_CHANNEL_PRIV);
4404     goto out;
4405   }
4406
4407   /* Get the new ban and add it to the ban list */
4408   add = silc_argument_get_arg_type(cmd->args, 2, &tmp_len);
4409   if (add) {
4410     if (!channel->ban_list)
4411       channel->ban_list = silc_calloc(tmp_len + 2, sizeof(*channel->ban_list));
4412     else
4413       channel->ban_list = silc_realloc(channel->ban_list,
4414                                        sizeof(*channel->ban_list) *
4415                                        (tmp_len +
4416                                         strlen(channel->ban_list) + 2));
4417     if (add[tmp_len - 1] == ',')
4418       add[tmp_len - 1] = '\0';
4419
4420     strncat(channel->ban_list, add, tmp_len);
4421     strncat(channel->ban_list, ",", 1);
4422   }
4423
4424   /* Get the ban to be removed and remove it from the list */
4425   del = silc_argument_get_arg_type(cmd->args, 3, &tmp_len);
4426   if (del && channel->ban_list) {
4427     char *start, *end, *n;
4428
4429     if (!strncmp(channel->ban_list, del, strlen(channel->ban_list) - 1)) {
4430       silc_free(channel->ban_list);
4431       channel->ban_list = NULL;
4432     } else {
4433       start = strstr(channel->ban_list, del);
4434       if (start && strlen(start) >= tmp_len) {
4435         end = start + tmp_len;
4436         n = silc_calloc(strlen(channel->ban_list) - tmp_len, sizeof(*n));
4437         strncat(n, channel->ban_list, start - channel->ban_list);
4438         strncat(n, end + 1, ((channel->ban_list + strlen(channel->ban_list)) -
4439                              end) - 1);
4440         silc_free(channel->ban_list);
4441         channel->ban_list = n;
4442       }
4443     }
4444   }
4445
4446   /* Send the BAN notify type to our primary router. */
4447   if (!server->standalone && (add || del))
4448     silc_server_send_notify_ban(server, server->router->connection,
4449                                 server->server_type == SILC_ROUTER ?
4450                                 TRUE : FALSE, channel, add, del);
4451
4452   /* Send the reply back to the client */
4453   if (channel->ban_list)
4454     packet =
4455       silc_command_reply_payload_encode_va(SILC_COMMAND_BAN,
4456                                            SILC_STATUS_OK, ident, 2,
4457                                            2, id, id_len,
4458                                            3, channel->ban_list,
4459                                            strlen(channel->ban_list) - 1);
4460   else
4461     packet =
4462       silc_command_reply_payload_encode_va(SILC_COMMAND_BAN,
4463                                            SILC_STATUS_OK, ident, 1,
4464                                            2, id, id_len);
4465
4466   silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0,
4467                           packet->data, packet->len, FALSE);
4468
4469   silc_buffer_free(packet);
4470
4471  out:
4472   if (channel_id)
4473     silc_free(channel_id);
4474   silc_server_command_free(cmd);
4475 }
4476
4477 /* Server side command of CLOSE. Closes connection to a specified server. */
4478
4479 SILC_SERVER_CMD_FUNC(close)
4480 {
4481   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
4482   SilcServer server = cmd->server;
4483   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
4484   SilcServerEntry server_entry;
4485   SilcSocketConnection sock;
4486   unsigned char *tmp;
4487   uint32 tmp_len;
4488   unsigned char *name;
4489   uint32 port = SILC_PORT;
4490
4491   SILC_SERVER_COMMAND_CHECK_ARGC(SILC_COMMAND_CLOSE, cmd, 1, 2);
4492
4493   if (!client || cmd->sock->type != SILC_SOCKET_TYPE_CLIENT)
4494     goto out;
4495
4496   /* Check whether client has the permissions. */
4497   if (client->mode == SILC_UMODE_NONE) {
4498     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CLOSE,
4499                                           SILC_STATUS_ERR_NO_SERVER_PRIV);
4500     goto out;
4501   }
4502
4503   /* Get the remote server */
4504   name = silc_argument_get_arg_type(cmd->args, 1, &tmp_len);
4505   if (!name) {
4506     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CLOSE,
4507                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
4508     goto out;
4509   }
4510
4511   /* Get port */
4512   tmp = silc_argument_get_arg_type(cmd->args, 2, &tmp_len);
4513   if (tmp)
4514     SILC_GET32_MSB(port, tmp);
4515
4516   server_entry = silc_idlist_find_server_by_conn(server->local_list,
4517                                                  name, port, NULL);
4518   if (!server_entry) {
4519     silc_server_command_send_status_reply(cmd, SILC_COMMAND_CLOSE,
4520                                           SILC_STATUS_ERR_NO_SERVER_ID);
4521     goto out;
4522   }
4523
4524   /* Send reply to the sender */
4525   silc_server_command_send_status_reply(cmd, SILC_COMMAND_CLOSE,
4526                                         SILC_STATUS_OK);
4527
4528   /* Close the connection to the server */
4529   sock = (SilcSocketConnection)server_entry->connection;
4530   silc_server_free_sock_user_data(server, sock);
4531   silc_server_close_connection(server, sock);
4532
4533  out:
4534   silc_server_command_free(cmd);
4535 }
4536
4537 /* Server side command of SHUTDOWN. Shutdowns the server and closes all
4538    active connections. */
4539
4540 SILC_SERVER_CMD_FUNC(shutdown)
4541 {
4542   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
4543   SilcServer server = cmd->server;
4544   SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data;
4545
4546   SILC_SERVER_COMMAND_CHECK_ARGC(SILC_COMMAND_SHUTDOWN, cmd, 0, 0);
4547
4548   if (!client || cmd->sock->type != SILC_SOCKET_TYPE_CLIENT)
4549     goto out;
4550
4551   /* Check whether client has the permission. */
4552   if (client->mode == SILC_UMODE_NONE) {
4553     silc_server_command_send_status_reply(cmd, SILC_COMMAND_SHUTDOWN,
4554                                           SILC_STATUS_ERR_NO_SERVER_PRIV);
4555     goto out;
4556   }
4557
4558   /* Send reply to the sender */
4559   silc_server_command_send_status_reply(cmd, SILC_COMMAND_SHUTDOWN,
4560                                         SILC_STATUS_OK);
4561
4562   /* Then, gracefully, or not, bring the server down. */
4563   silc_server_stop(server);
4564   exit(0);
4565
4566  out:
4567   silc_server_command_free(cmd);
4568 }
4569
4570 /* Server side command of LEAVE. Removes client from a channel. */
4571
4572 SILC_SERVER_CMD_FUNC(leave)
4573 {
4574   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
4575   SilcServer server = cmd->server;
4576   SilcSocketConnection sock = cmd->sock;
4577   SilcClientEntry id_entry = (SilcClientEntry)cmd->sock->user_data;
4578   SilcChannelID *id = NULL;
4579   SilcChannelEntry channel;
4580   uint32 len;
4581   unsigned char *tmp;
4582
4583   SILC_SERVER_COMMAND_CHECK_ARGC(SILC_COMMAND_LEAVE, cmd, 1, 2);
4584
4585   /* Get Channel ID */
4586   tmp = silc_argument_get_arg_type(cmd->args, 1, &len);
4587   if (!tmp) {
4588     silc_server_command_send_status_reply(cmd, SILC_COMMAND_LEAVE,
4589                                           SILC_STATUS_ERR_NO_CHANNEL_ID);
4590     goto out;
4591   }
4592   id = silc_id_payload_parse_id(tmp, len);
4593   if (!id) {
4594     silc_server_command_send_status_reply(cmd, SILC_COMMAND_LEAVE,
4595                                           SILC_STATUS_ERR_NO_CHANNEL_ID);
4596     goto out;
4597   }
4598
4599   /* Get channel entry */
4600   channel = silc_idlist_find_channel_by_id(server->local_list, id, NULL);
4601   if (!channel) {
4602     channel = silc_idlist_find_channel_by_id(server->global_list, id, NULL);
4603     if (!channel) {
4604       silc_server_command_send_status_reply(cmd, SILC_COMMAND_LEAVE,
4605                                             SILC_STATUS_ERR_NO_SUCH_CHANNEL);
4606       goto out;
4607     }
4608   }
4609
4610   /* Check whether this client is on the channel */
4611   if (!silc_server_client_on_channel(id_entry, channel)) {
4612     silc_server_command_send_status_reply(cmd, SILC_COMMAND_LEAVE,
4613                                           SILC_STATUS_ERR_NOT_ON_CHANNEL);
4614     goto out;
4615   }
4616
4617   /* Notify routers that they should remove this client from their list
4618      of clients on the channel. Send LEAVE notify type. */
4619   if (!server->standalone)
4620     silc_server_send_notify_leave(server, server->router->connection,
4621                                   server->server_type == SILC_ROUTER ?
4622                                   TRUE : FALSE, channel, id_entry->id);
4623
4624   silc_server_command_send_status_reply(cmd, SILC_COMMAND_LEAVE,
4625                                         SILC_STATUS_OK);
4626
4627   /* Remove client from channel */
4628   if (!silc_server_remove_from_one_channel(server, sock, channel, id_entry,
4629                                            TRUE))
4630     /* If the channel does not exist anymore we won't send anything */
4631     goto out;
4632
4633   if (!(channel->mode & SILC_CHANNEL_MODE_PRIVKEY)) {
4634     /* Re-generate channel key */
4635     silc_server_create_channel_key(server, channel, 0);
4636
4637     /* Send the channel key */
4638     silc_server_send_channel_key(server, NULL, channel,
4639                                  server->server_type == SILC_ROUTER ?
4640                                  FALSE : !server->standalone);
4641   }
4642
4643  out:
4644   if (id)
4645     silc_free(id);
4646   silc_server_command_free(cmd);
4647 }
4648
4649 /* Server side of command USERS. Resolves clients and their USERS currently
4650    joined on the requested channel. The list of Client ID's and their modes
4651    on the channel is sent back. */
4652
4653 SILC_SERVER_CMD_FUNC(users)
4654 {
4655   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
4656   SilcServer server = cmd->server;
4657   SilcChannelEntry channel;
4658   SilcChannelID *id;
4659   SilcBuffer packet;
4660   unsigned char *channel_id;
4661   uint32 channel_id_len;
4662   SilcBuffer client_id_list;
4663   SilcBuffer client_mode_list;
4664   unsigned char lc[4];
4665   uint32 list_count = 0;
4666   uint16 ident = silc_command_get_ident(cmd->payload);
4667
4668   SILC_SERVER_COMMAND_CHECK_ARGC(SILC_COMMAND_USERS, cmd, 1, 1);
4669
4670   /* Get Channel ID */
4671   channel_id = silc_argument_get_arg_type(cmd->args, 1, &channel_id_len);
4672   if (!channel_id) {
4673     silc_server_command_send_status_reply(cmd, SILC_COMMAND_USERS,
4674                                           SILC_STATUS_ERR_NO_CHANNEL_ID);
4675     goto out;
4676   }
4677   id = silc_id_payload_parse_id(channel_id, channel_id_len);
4678   if (!id) {
4679     silc_server_command_send_status_reply(cmd, SILC_COMMAND_USERS,
4680                                           SILC_STATUS_ERR_NO_CHANNEL_ID);
4681     goto out;
4682   }
4683
4684   /* If we are server and we don't know about this channel we will send
4685      the command to our router. If we know about the channel then we also
4686      have the list of users already. */
4687   channel = silc_idlist_find_channel_by_id(server->local_list, id, NULL);
4688   if (!channel) {
4689     if (server->server_type == SILC_SERVER && !server->standalone &&
4690         !cmd->pending) {
4691       SilcBuffer tmpbuf;
4692
4693       silc_command_set_ident(cmd->payload, silc_rng_get_rn16(server->rng));
4694       tmpbuf = silc_command_payload_encode_payload(cmd->payload);
4695
4696       /* Send USERS command */
4697       silc_server_packet_send(server, server->router->connection,
4698                               SILC_PACKET_COMMAND, cmd->packet->flags,
4699                               tmpbuf->data, tmpbuf->len, TRUE);
4700
4701       /* Reprocess this packet after received reply */
4702       silc_server_command_pending(server, SILC_COMMAND_USERS,
4703                                   silc_command_get_ident(cmd->payload),
4704                                   silc_server_command_destructor,
4705                                   silc_server_command_users,
4706                                   silc_server_command_dup(cmd));
4707       cmd->pending = TRUE;
4708       silc_command_set_ident(cmd->payload, ident);
4709
4710       silc_buffer_free(tmpbuf);
4711       silc_free(id);
4712       return;
4713     }
4714
4715     /* We are router and we will check the global list as well. */
4716     channel = silc_idlist_find_channel_by_id(server->global_list, id, NULL);
4717     if (!channel) {
4718       /* Channel really does not exist */
4719       silc_server_command_send_status_reply(cmd, SILC_COMMAND_USERS,
4720                                             SILC_STATUS_ERR_NO_SUCH_CHANNEL);
4721       goto out;
4722     }
4723   }
4724
4725   /* Get the users list */
4726   silc_server_get_users_on_channel(server, channel, &client_id_list,
4727                                    &client_mode_list, &list_count);
4728
4729   /* List count */
4730   SILC_PUT32_MSB(list_count, lc);
4731
4732   /* Send reply */
4733   packet = silc_command_reply_payload_encode_va(SILC_COMMAND_USERS,
4734                                                 SILC_STATUS_OK, ident, 4,
4735                                                 2, channel_id, channel_id_len,
4736                                                 3, lc, 4,
4737                                                 4, client_id_list->data,
4738                                                 client_id_list->len,
4739                                                 5, client_mode_list->data,
4740                                                 client_mode_list->len);
4741   silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0,
4742                           packet->data, packet->len, FALSE);
4743
4744   silc_buffer_free(packet);
4745   silc_buffer_free(client_id_list);
4746   silc_buffer_free(client_mode_list);
4747   silc_free(id);
4748
4749  out:
4750   silc_server_command_free(cmd);
4751 }
4752
4753 /* Server side of command GETKEY. This fetches the client's public key
4754    from the server where to the client is connected. */
4755
4756 SILC_SERVER_CMD_FUNC(getkey)
4757 {
4758   SilcServerCommandContext cmd = (SilcServerCommandContext)context;
4759   SilcServer server = cmd->server;
4760   SilcBuffer packet;
4761   SilcClientEntry client;
4762   SilcServerEntry server_entry;
4763   SilcClientID *client_id = NULL;
4764   SilcServerID *server_id = NULL;
4765   SilcIDPayload idp = NULL;
4766   uint16 ident = silc_command_get_ident(cmd->payload);
4767   unsigned char *tmp;
4768   uint32 tmp_len;
4769   SilcBuffer pk;
4770   SilcIdType id_type;
4771
4772   SILC_LOG_DEBUG(("Start"));
4773
4774   tmp = silc_argument_get_arg_type(cmd->args, 1, &tmp_len);
4775   if (!tmp) {
4776     silc_server_command_send_status_reply(cmd, SILC_COMMAND_GETKEY,
4777                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
4778     goto out;
4779   }
4780   idp = silc_id_payload_parse_data(tmp, tmp_len);
4781   if (!idp) {
4782     silc_server_command_send_status_reply(cmd, SILC_COMMAND_GETKEY,
4783                                           SILC_STATUS_ERR_NOT_ENOUGH_PARAMS);
4784     goto out;
4785   }
4786
4787   id_type = silc_id_payload_get_type(idp);
4788   if (id_type == SILC_ID_CLIENT) {
4789     client_id = silc_id_payload_get_id(idp);
4790
4791     /* If the client is not found from local list there is no chance it
4792        would be locally connected client so send the command further. */
4793     client = silc_idlist_find_client_by_id(server->local_list,
4794                                            client_id, NULL);
4795     if (!client)
4796       client = silc_idlist_find_client_by_id(server->global_list,
4797                                              client_id, NULL);
4798
4799     if ((!client && !cmd->pending && !server->standalone) ||
4800         (client && !client->connection && !cmd->pending &&
4801          !server->standalone) ||
4802         (client && !client->data.public_key && !cmd->pending &&
4803          !server->standalone)) {
4804       SilcBuffer tmpbuf;
4805       uint16 old_ident;
4806       SilcSocketConnection dest_sock;
4807
4808       dest_sock = silc_server_get_client_route(server, NULL, 0,
4809                                                client_id, NULL);
4810       if (!dest_sock)
4811         goto out;
4812
4813       old_ident = silc_command_get_ident(cmd->payload);
4814       silc_command_set_ident(cmd->payload, silc_rng_get_rn16(server->rng));
4815       tmpbuf = silc_command_payload_encode_payload(cmd->payload);
4816
4817       silc_server_packet_send(server, dest_sock,
4818                               SILC_PACKET_COMMAND, cmd->packet->flags,
4819                               tmpbuf->data, tmpbuf->len, TRUE);
4820
4821       /* Reprocess this packet after received reply from router */
4822       silc_server_command_pending(server, SILC_COMMAND_GETKEY,
4823                                   silc_command_get_ident(cmd->payload),
4824                                   silc_server_command_destructor,
4825                                   silc_server_command_getkey,
4826                                   silc_server_command_dup(cmd));
4827       cmd->pending = TRUE;
4828
4829       silc_command_set_ident(cmd->payload, old_ident);
4830       silc_buffer_free(tmpbuf);
4831       return;
4832     }
4833
4834     if (!client && cmd->pending) {
4835       silc_server_command_send_status_reply(cmd, SILC_COMMAND_GETKEY,
4836                                             SILC_STATUS_ERR_NO_SUCH_CLIENT_ID);
4837       goto out;
4838     }
4839
4840     /* The client is locally connected, just get the public key and
4841        send it back. */
4842     tmp = silc_pkcs_public_key_encode(client->data.public_key, &tmp_len);
4843     pk = silc_buffer_alloc(4 + tmp_len);
4844     silc_buffer_pull_tail(pk, SILC_BUFFER_END(pk));
4845     silc_buffer_format(pk,
4846                        SILC_STR_UI_SHORT(tmp_len),
4847                        SILC_STR_UI_SHORT(SILC_SKE_PK_TYPE_SILC),
4848                        SILC_STR_UI_XNSTRING(tmp, tmp_len),
4849                        SILC_STR_END);
4850     silc_free(tmp);
4851
4852   } else if (id_type == SILC_ID_SERVER) {
4853     server_id = silc_id_payload_get_id(idp);
4854
4855     /* If the server is not found from local list there is no chance it
4856        would be locally connected server so send the command further. */
4857     server_entry = silc_idlist_find_server_by_id(server->local_list,
4858                                                  server_id, NULL);
4859     if (!server_entry)
4860       server_entry = silc_idlist_find_server_by_id(server->global_list,
4861                                                    server_id, NULL);
4862
4863     if ((!server_entry && !cmd->pending && !server->standalone) ||
4864         (server_entry && !server_entry->connection && !cmd->pending &&
4865          !server->standalone) ||
4866         (server_entry && !server_entry->data.public_key && !cmd->pending &&
4867          !server->standalone)) {
4868       SilcBuffer tmpbuf;
4869       uint16 old_ident;
4870
4871       old_ident = silc_command_get_ident(cmd->payload);
4872       silc_command_set_ident(cmd->payload, silc_rng_get_rn16(server->rng));
4873       tmpbuf = silc_command_payload_encode_payload(cmd->payload);
4874
4875       silc_server_packet_send(server, server->router->connection,
4876                               SILC_PACKET_COMMAND, cmd->packet->flags,
4877                               tmpbuf->data, tmpbuf->len, TRUE);
4878
4879       /* Reprocess this packet after received reply from router */
4880       silc_server_command_pending(server, SILC_COMMAND_GETKEY,
4881                                   silc_command_get_ident(cmd->payload),
4882                                   silc_server_command_destructor,
4883                                   silc_server_command_getkey,
4884                                   silc_server_command_dup(cmd));
4885       cmd->pending = TRUE;
4886
4887       silc_command_set_ident(cmd->payload, old_ident);
4888       silc_buffer_free(tmpbuf);
4889       return;
4890     }
4891
4892     if (!server_entry && cmd->pending) {
4893       silc_server_command_send_status_reply(cmd, SILC_COMMAND_GETKEY,
4894                                             SILC_STATUS_ERR_NO_SUCH_SERVER_ID);
4895       goto out;
4896     }
4897
4898     /* The client is locally connected, just get the public key and
4899        send it back. */
4900     tmp = silc_pkcs_public_key_encode(server_entry->data.public_key, &tmp_len);
4901     pk = silc_buffer_alloc(4 + tmp_len);
4902     silc_buffer_pull_tail(pk, SILC_BUFFER_END(pk));
4903     silc_buffer_format(pk,
4904                        SILC_STR_UI_SHORT(tmp_len),
4905                        SILC_STR_UI_SHORT(SILC_SKE_PK_TYPE_SILC),
4906                        SILC_STR_UI_XNSTRING(tmp, tmp_len),
4907                        SILC_STR_END);
4908     silc_free(tmp);
4909   } else {
4910     goto out;
4911   }
4912
4913   tmp = silc_argument_get_arg_type(cmd->args, 1, &tmp_len);
4914   packet = silc_command_reply_payload_encode_va(SILC_COMMAND_GETKEY,
4915                                                 SILC_STATUS_OK, ident, 2,
4916                                                 2, tmp, tmp_len,
4917                                                 3, pk->data, pk->len);
4918   silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0,
4919                           packet->data, packet->len, FALSE);
4920   silc_buffer_free(packet);
4921   silc_buffer_free(pk);
4922
4923  out:
4924   if (idp)
4925     silc_id_payload_free(idp);
4926   silc_free(client_id);
4927   silc_free(server_id);
4928   silc_server_command_free(cmd);
4929 }