apps/silcd/packet_receive.c

   1 /*
   2
   3   packet_receive.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 /*
  21  * Server packet routines to handle received packets.
  22  */
  23 /* $Id$ */
  24
  25 #include "serverincludes.h"
  26 #include "server_internal.h"
  27
  28 extern char *server_version;
  29
  30 /* Received notify packet. Server can receive notify packets from router.
  31    Server then relays the notify messages to clients if needed. */
  32
  33 void silc_server_notify(SilcServer server,
  34                         SilcSocketConnection sock,
  35                         SilcPacketContext *packet)
  36 {
  37   SilcNotifyPayload payload;
  38   SilcNotifyType type;
  39   SilcArgumentPayload args;
  40   SilcChannelID *channel_id, *channel_id2;
  41   SilcClientID *client_id, *client_id2;
  42   SilcServerID *server_id;
  43   SilcChannelEntry channel;
  44   SilcClientEntry client;
  45   SilcServerEntry server_entry;
  46   SilcChannelClientEntry chl;
  47   SilcIDCacheEntry cache;
  48   uint32 mode;
  49   unsigned char *tmp;
  50   uint32 tmp_len;
  51
  52   SILC_LOG_DEBUG(("Start"));
  53
  54   if (sock->type == SILC_SOCKET_TYPE_CLIENT ||
  55       packet->src_id_type != SILC_ID_SERVER)
  56     return;
  57
  58   if (!packet->dst_id)
  59     return;
  60
  61   /* If the packet is destined directly to a client then relay the packet
  62      before processing it. */
  63   if (packet->dst_id_type == SILC_ID_CLIENT) {
  64     SilcIDListData idata;
  65     SilcSocketConnection dst_sock;
  66
  67     /* Get the route to the client */
  68     dst_sock = silc_server_get_client_route(server, packet->dst_id,
  69                                             packet->dst_id_len, NULL, &idata);
  70     if (dst_sock)
  71       /* Relay the packet */
  72       silc_server_relay_packet(server, dst_sock, idata->send_key,
  73                                idata->hmac_receive, packet, TRUE);
  74   }
  75
  76   /* If we are router and this packet is not already broadcast packet
  77      we will broadcast it. The sending socket really cannot be router or
  78      the router is buggy. If this packet is coming from router then it must
  79      have the broadcast flag set already and we won't do anything. */
  80   if (!server->standalone && server->server_type == SILC_ROUTER &&
  81       sock->type == SILC_SOCKET_TYPE_SERVER &&
  82       !(packet->flags & SILC_PACKET_FLAG_BROADCAST)) {
  83     SILC_LOG_DEBUG(("Broadcasting received Notify packet"));
  84     silc_server_packet_send(server, server->router->connection, packet->type,
  85                             packet->flags | SILC_PACKET_FLAG_BROADCAST,
  86                             packet->buffer->data, packet->buffer->len, FALSE);
  87   }
  88
  89   payload = silc_notify_payload_parse(packet->buffer);
  90   if (!payload)
  91     return;
  92
  93   type = silc_notify_get_type(payload);
  94   args = silc_notify_get_args(payload);
  95   if (!args)
  96     goto out;
  97
  98   switch(type) {
  99   case SILC_NOTIFY_TYPE_JOIN:
 100     /*
 101      * Distribute the notify to local clients on the channel
 102      */
 103     SILC_LOG_DEBUG(("JOIN notify"));
 104
 105     /* Get Channel ID */
 106     tmp = silc_argument_get_arg_type(args, 2, &tmp_len);
 107     if (!tmp)
 108       goto out;
 109     channel_id = silc_id_payload_parse_id(tmp, tmp_len);
 110     if (!channel_id)
 111       goto out;
 112
 113     /* Get channel entry */
 114     channel = silc_idlist_find_channel_by_id(server->global_list,
 115                                              channel_id, NULL);
 116     if (!channel) {
 117       channel = silc_idlist_find_channel_by_id(server->local_list,
 118                                                channel_id, NULL);
 119       if (!channel) {
 120         silc_free(channel_id);
 121         goto out;
 122       }
 123     }
 124     silc_free(channel_id);
 125
 126     /* Get client ID */
 127     tmp = silc_argument_get_arg_type(args, 1, &tmp_len);
 128     if (!tmp)
 129       goto out;
 130     client_id = silc_id_payload_parse_id(tmp, tmp_len);
 131     if (!client_id)
 132       goto out;
 133
 134     /* Send to channel */
 135     silc_server_packet_send_to_channel(server, sock, channel, packet->type,
 136                                        FALSE, packet->buffer->data,
 137                                        packet->buffer->len, FALSE);
 138
 139     /* If the the client is not in local list we check global list (ie. the
 140        channel will be global channel) and if it does not exist then create
 141        entry for the client. */
 142     client = silc_idlist_find_client_by_id(server->global_list,
 143                                            client_id, NULL);
 144     if (!client) {
 145       client = silc_idlist_find_client_by_id(server->local_list,
 146                                              client_id, NULL);
 147       if (!client) {
 148         /* If router did not find the client the it is bogus */
 149         if (server->server_type == SILC_ROUTER)
 150           goto out;
 151
 152         client =
 153           silc_idlist_add_client(server->global_list, NULL, 0, NULL, NULL,
 154                                  silc_id_dup(client_id, SILC_ID_CLIENT),
 155                                  sock->user_data, NULL);
 156         if (!client) {
 157           silc_free(client_id);
 158           goto out;
 159         }
 160
 161         client->data.registered = TRUE;
 162       }
 163     }
 164
 165     /* Do not add client to channel if it is there already */
 166     if (silc_server_client_on_channel(client, channel))
 167       break;
 168
 169     if (server->server_type == SILC_SERVER &&
 170         sock->type == SILC_SOCKET_TYPE_ROUTER)
 171       /* The channel is global now */
 172       channel->global_users = TRUE;
 173
 174     /* JOIN the global client to the channel (local clients (if router
 175        created the channel) is joined in the pending JOIN command). */
 176     chl = silc_calloc(1, sizeof(*chl));
 177     chl->client = client;
 178     chl->channel = channel;
 179     silc_list_add(channel->user_list, chl);
 180     silc_list_add(client->channels, chl);
 181     silc_free(client_id);
 182
 183     break;
 184
 185   case SILC_NOTIFY_TYPE_LEAVE:
 186     /*
 187      * Distribute the notify to local clients on the channel
 188      */
 189     SILC_LOG_DEBUG(("LEAVE notify"));
 190
 191     channel_id = silc_id_str2id(packet->dst_id, packet->dst_id_len,
 192                                 packet->dst_id_type);
 193     if (!channel_id)
 194       goto out;
 195
 196     /* Get channel entry */
 197     channel = silc_idlist_find_channel_by_id(server->global_list,
 198                                              channel_id, NULL);
 199     if (!channel) {
 200       channel = silc_idlist_find_channel_by_id(server->local_list,
 201                                                channel_id, NULL);
 202       if (!channel) {
 203         silc_free(channel_id);
 204         goto out;
 205       }
 206     }
 207
 208     /* Get client ID */
 209     tmp = silc_argument_get_arg_type(args, 1, &tmp_len);
 210     if (!tmp) {
 211       silc_free(channel_id);
 212       goto out;
 213     }
 214     client_id = silc_id_payload_parse_id(tmp, tmp_len);
 215     if (!client_id) {
 216       silc_free(channel_id);
 217       goto out;
 218     }
 219
 220     /* Send to channel */
 221     silc_server_packet_send_to_channel(server, sock, channel, packet->type,
 222                                        FALSE, packet->buffer->data,
 223                                        packet->buffer->len, FALSE);
 224
 225     /* Get client entry */
 226     client = silc_idlist_find_client_by_id(server->global_list,
 227                                            client_id, NULL);
 228     if (!client) {
 229       client = silc_idlist_find_client_by_id(server->local_list,
 230                                              client_id, NULL);
 231       if (!client) {
 232         silc_free(client_id);
 233         silc_free(channel_id);
 234         goto out;
 235       }
 236     }
 237     silc_free(client_id);
 238
 239     /* Remove the user from channel */
 240     silc_server_remove_from_one_channel(server, sock, channel, client, FALSE);
 241     break;
 242
 243   case SILC_NOTIFY_TYPE_SIGNOFF:
 244     /*
 245      * Distribute the notify to local clients on the channel
 246      */
 247     SILC_LOG_DEBUG(("SIGNOFF notify"));
 248
 249     /* Get client ID */
 250     tmp = silc_argument_get_arg_type(args, 1, &tmp_len);
 251     if (!tmp)
 252       goto out;
 253     client_id = silc_id_payload_parse_id(tmp, tmp_len);
 254     if (!client_id)
 255       goto out;
 256
 257     /* Get client entry */
 258     client = silc_idlist_find_client_by_id(server->global_list,
 259                                            client_id, &cache);
 260     if (!client) {
 261       client = silc_idlist_find_client_by_id(server->local_list,
 262                                              client_id, &cache);
 263       if (!client) {
 264         silc_free(client_id);
 265         goto out;
 266       }
 267     }
 268     silc_free(client_id);
 269
 270     /* Get signoff message */
 271     tmp = silc_argument_get_arg_type(args, 2, &tmp_len);
 272     if (tmp_len > 128)
 273       tmp = NULL;
 274
 275     /* Remove the client from all channels. */
 276     silc_server_remove_from_channels(server, NULL, client, TRUE, tmp, FALSE);
 277
 278     client->data.registered = FALSE;
 279     cache->expire = SILC_ID_CACHE_EXPIRE_DEF;
 280     break;
 281
 282   case SILC_NOTIFY_TYPE_TOPIC_SET:
 283     /*
 284      * Distribute the notify to local clients on the channel
 285      */
 286
 287     SILC_LOG_DEBUG(("TOPIC SET notify"));
 288
 289     channel_id = silc_id_str2id(packet->dst_id, packet->dst_id_len,
 290                                 packet->dst_id_type);
 291     if (!channel_id)
 292       goto out;
 293
 294     /* Get channel entry */
 295     channel = silc_idlist_find_channel_by_id(server->global_list,
 296                                              channel_id, NULL);
 297     if (!channel) {
 298       channel = silc_idlist_find_channel_by_id(server->local_list,
 299                                                channel_id, NULL);
 300       if (!channel) {
 301         silc_free(channel_id);
 302         goto out;
 303       }
 304     }
 305
 306     /* Get the topic */
 307     tmp = silc_argument_get_arg_type(args, 2, &tmp_len);
 308     if (!tmp) {
 309       silc_free(channel_id);
 310       goto out;
 311     }
 312
 313     if (channel->topic)
 314       silc_free(channel->topic);
 315     channel->topic = silc_calloc(tmp_len, sizeof(*channel->topic));
 316     memcpy(channel->topic, tmp, tmp_len);
 317
 318     /* Send the same notify to the channel */
 319     silc_server_packet_send_to_channel(server, sock, channel, packet->type,
 320                                        FALSE, packet->buffer->data,
 321                                        packet->buffer->len, FALSE);
 322     silc_free(channel_id);
 323     break;
 324
 325   case SILC_NOTIFY_TYPE_NICK_CHANGE:
 326     {
 327       /*
 328        * Distribute the notify to local clients on the channel
 329        */
 330       unsigned char *id, *id2;
 331
 332       SILC_LOG_DEBUG(("NICK CHANGE notify"));
 333
 334       /* Get old client ID */
 335       id = silc_argument_get_arg_type(args, 1, &tmp_len);
 336       if (!id)
 337         goto out;
 338       client_id = silc_id_payload_parse_id(id, tmp_len);
 339       if (!client_id)
 340         goto out;
 341
 342       /* Get new client ID */
 343       id2 = silc_argument_get_arg_type(args, 2, &tmp_len);
 344       if (!id2)
 345         goto out;
 346       client_id2 = silc_id_payload_parse_id(id2, tmp_len);
 347       if (!client_id2)
 348         goto out;
 349
 350       SILC_LOG_DEBUG(("Old Client ID id(%s)",
 351                       silc_id_render(client_id, SILC_ID_CLIENT)));
 352       SILC_LOG_DEBUG(("New Client ID id(%s)",
 353                       silc_id_render(client_id2, SILC_ID_CLIENT)));
 354
 355       /* Replace the Client ID */
 356       client = silc_idlist_replace_client_id(server->global_list, client_id,
 357                                              client_id2);
 358       if (!client)
 359         client = silc_idlist_replace_client_id(server->local_list, client_id,
 360                                                client_id2);
 361
 362       if (client) {
 363         /* The nickname is not valid anymore, set it NULL. This causes that
 364            the nickname will be queried if someone wants to know it. */
 365         if (client->nickname)
 366           silc_free(client->nickname);
 367         client->nickname = NULL;
 368
 369         /* Send the NICK_CHANGE notify type to local clients on the channels
 370            this client is joined to. */
 371         silc_server_send_notify_on_channels(server, NULL, client,
 372                                             SILC_NOTIFY_TYPE_NICK_CHANGE, 2,
 373                                             id, tmp_len,
 374                                             id2, tmp_len);
 375       }
 376
 377       silc_free(client_id);
 378       if (!client)
 379         silc_free(client_id2);
 380       break;
 381     }
 382
 383   case SILC_NOTIFY_TYPE_CMODE_CHANGE:
 384     /*
 385      * Distribute the notify to local clients on the channel
 386      */
 387
 388     SILC_LOG_DEBUG(("CMODE CHANGE notify"));
 389
 390     channel_id = silc_id_str2id(packet->dst_id, packet->dst_id_len,
 391                                 packet->dst_id_type);
 392     if (!channel_id)
 393       goto out;
 394
 395     /* Get channel entry */
 396     channel = silc_idlist_find_channel_by_id(server->global_list,
 397                                              channel_id, NULL);
 398     if (!channel) {
 399       channel = silc_idlist_find_channel_by_id(server->local_list,
 400                                                channel_id, NULL);
 401       if (!channel) {
 402         silc_free(channel_id);
 403         goto out;
 404       }
 405     }
 406
 407     /* Send the same notify to the channel */
 408     silc_server_packet_send_to_channel(server, sock, channel, packet->type,
 409                                        FALSE, packet->buffer->data,
 410                                        packet->buffer->len, FALSE);
 411
 412     /* Get the mode */
 413     tmp = silc_argument_get_arg_type(args, 2, &tmp_len);
 414     if (!tmp) {
 415       silc_free(channel_id);
 416       goto out;
 417     }
 418
 419     SILC_GET32_MSB(mode, tmp);
 420
 421     /* If the channel had private keys set and the mode was removed then
 422        we must re-generate and re-distribute a new channel key */
 423     if (channel->mode & SILC_CHANNEL_MODE_PRIVKEY &&
 424         !(mode & SILC_CHANNEL_MODE_PRIVKEY)) {
 425       /* Re-generate channel key */
 426       silc_server_create_channel_key(server, channel, 0);
 427
 428       /* Send the channel key. This sends it to our local clients and if
 429          we are normal server to our router as well. */
 430       silc_server_send_channel_key(server, NULL, channel,
 431                                    server->server_type == SILC_ROUTER ?
 432                                    FALSE : !server->standalone);
 433     }
 434
 435     /* Change mode */
 436     channel->mode = mode;
 437     silc_free(channel_id);
 438
 439     /* Get the hmac */
 440     tmp = silc_argument_get_arg_type(args, 4, &tmp_len);
 441     if (tmp) {
 442       unsigned char hash[32];
 443
 444       if (channel->hmac)
 445         silc_hmac_free(channel->hmac);
 446       if (!silc_hmac_alloc(tmp, NULL, &channel->hmac))
 447         goto out;
 448
 449       /* Set the HMAC key out of current channel key. The client must do
 450          this locally. */
 451       silc_hash_make(channel->hmac->hash, channel->key, channel->key_len / 8,
 452                      hash);
 453       silc_hmac_set_key(channel->hmac, hash,
 454                         silc_hash_len(channel->hmac->hash));
 455       memset(hash, 0, sizeof(hash));
 456     }
 457
 458     break;
 459
 460   case SILC_NOTIFY_TYPE_CUMODE_CHANGE:
 461     /*
 462      * Distribute the notify to local clients on the channel
 463      */
 464
 465     SILC_LOG_DEBUG(("CUMODE CHANGE notify"));
 466
 467     channel_id = silc_id_str2id(packet->dst_id, packet->dst_id_len,
 468                                 packet->dst_id_type);
 469     if (!channel_id)
 470       goto out;
 471
 472     /* Get channel entry */
 473     channel = silc_idlist_find_channel_by_id(server->global_list,
 474                                              channel_id, NULL);
 475     if (!channel) {
 476       channel = silc_idlist_find_channel_by_id(server->local_list,
 477                                                channel_id, NULL);
 478       if (!channel) {
 479         silc_free(channel_id);
 480         goto out;
 481       }
 482     }
 483
 484     /* Get the mode */
 485     tmp = silc_argument_get_arg_type(args, 2, &tmp_len);
 486     if (!tmp) {
 487       silc_free(channel_id);
 488       goto out;
 489     }
 490
 491     SILC_GET32_MSB(mode, tmp);
 492
 493     /* Get target client */
 494     tmp = silc_argument_get_arg_type(args, 3, &tmp_len);
 495     if (!tmp)
 496       goto out;
 497     client_id = silc_id_payload_parse_id(tmp, tmp_len);
 498     if (!client_id)
 499       goto out;
 500
 501     /* Get client entry */
 502     client = silc_idlist_find_client_by_id(server->global_list,
 503                                            client_id, NULL);
 504     if (!client) {
 505       client = silc_idlist_find_client_by_id(server->local_list,
 506                                              client_id, NULL);
 507       if (!client) {
 508         silc_free(client_id);
 509         goto out;
 510       }
 511     }
 512     silc_free(client_id);
 513
 514     /* Get entry to the channel user list */
 515     silc_list_start(channel->user_list);
 516     while ((chl = silc_list_get(channel->user_list)) != SILC_LIST_END)
 517       if (chl->client == client) {
 518         /* Change the mode */
 519         chl->mode = mode;
 520         break;
 521       }
 522
 523     /* Send the same notify to the channel */
 524     silc_server_packet_send_to_channel(server, sock, channel, packet->type,
 525                                        FALSE, packet->buffer->data,
 526                                        packet->buffer->len, FALSE);
 527     silc_free(channel_id);
 528     break;
 529
 530   case SILC_NOTIFY_TYPE_INVITE:
 531
 532     if (packet->dst_id_type == SILC_ID_CLIENT)
 533       goto out;
 534
 535     SILC_LOG_DEBUG(("INVITE notify"));
 536
 537     /* Get Channel ID */
 538     tmp = silc_argument_get_arg_type(args, 1, &tmp_len);
 539     if (!tmp)
 540       goto out;
 541     channel_id = silc_id_payload_parse_id(tmp, tmp_len);
 542     if (!channel_id)
 543       goto out;
 544
 545     /* Get channel entry */
 546     channel = silc_idlist_find_channel_by_id(server->global_list,
 547                                              channel_id, NULL);
 548     if (!channel) {
 549       channel = silc_idlist_find_channel_by_id(server->local_list,
 550                                                channel_id, NULL);
 551       if (!channel) {
 552         silc_free(channel_id);
 553         goto out;
 554       }
 555     }
 556     silc_free(channel_id);
 557
 558     /* Get the added invite */
 559     tmp = silc_argument_get_arg_type(args, 3, &tmp_len);
 560     if (tmp) {
 561       if (!channel->invite_list)
 562         channel->invite_list = silc_calloc(tmp_len + 2,
 563                                            sizeof(*channel->invite_list));
 564       else
 565         channel->invite_list = silc_realloc(channel->invite_list,
 566                                             sizeof(*channel->invite_list) *
 567                                             (tmp_len +
 568                                              strlen(channel->invite_list) +
 569                                              2));
 570       if (tmp[tmp_len - 1] == ',')
 571         tmp[tmp_len - 1] = '\0';
 572
 573       strncat(channel->invite_list, tmp, tmp_len);
 574       strncat(channel->invite_list, ",", 1);
 575     }
 576
 577     /* Get the deleted invite */
 578     tmp = silc_argument_get_arg_type(args, 4, &tmp_len);
 579     if (tmp && channel->invite_list) {
 580       char *start, *end, *n;
 581
 582       if (!strncmp(channel->invite_list, tmp,
 583                    strlen(channel->invite_list) - 1)) {
 584         silc_free(channel->invite_list);
 585         channel->invite_list = NULL;
 586       } else {
 587         start = strstr(channel->invite_list, tmp);
 588         if (start && strlen(start) >= tmp_len) {
 589           end = start + tmp_len;
 590           n = silc_calloc(strlen(channel->invite_list) - tmp_len, sizeof(*n));
 591           strncat(n, channel->invite_list, start - channel->invite_list);
 592           strncat(n, end + 1, ((channel->invite_list +
 593                                 strlen(channel->invite_list)) - end) - 1);
 594           silc_free(channel->invite_list);
 595           channel->invite_list = n;
 596         }
 597       }
 598     }
 599
 600     break;
 601
 602   case SILC_NOTIFY_TYPE_CHANNEL_CHANGE:
 603     /*
 604      * Distribute to the local clients on the channel and change the
 605      * channel ID.
 606      */
 607
 608     SILC_LOG_DEBUG(("CHANNEL CHANGE"));
 609
 610     if (sock->type != SILC_SOCKET_TYPE_ROUTER)
 611       break;
 612
 613     /* Get the old Channel ID */
 614     tmp = silc_argument_get_arg_type(args, 1, &tmp_len);
 615     if (!tmp)
 616       goto out;
 617     channel_id = silc_id_payload_parse_id(tmp, tmp_len);
 618     if (!channel_id)
 619       goto out;
 620
 621     /* Get the channel entry */
 622     channel = silc_idlist_find_channel_by_id(server->global_list,
 623                                              channel_id, NULL);
 624     if (!channel) {
 625       channel = silc_idlist_find_channel_by_id(server->local_list,
 626                                                channel_id, NULL);
 627       if (!channel) {
 628         silc_free(channel_id);
 629         goto out;
 630       }
 631     }
 632
 633     /* Send the notify to the channel */
 634     silc_server_packet_send_to_channel(server, sock, channel, packet->type,
 635                                        FALSE, packet->buffer->data,
 636                                        packet->buffer->len, FALSE);
 637
 638     /* Get the new Channel ID */
 639     tmp = silc_argument_get_arg_type(args, 2, &tmp_len);
 640     if (!tmp)
 641       goto out;
 642     channel_id2 = silc_id_payload_parse_id(tmp, tmp_len);
 643     if (!channel_id2)
 644       goto out;
 645
 646     SILC_LOG_DEBUG(("Old Channel ID id(%s)",
 647                     silc_id_render(channel_id, SILC_ID_CHANNEL)));
 648     SILC_LOG_DEBUG(("New Channel ID id(%s)",
 649                     silc_id_render(channel_id2, SILC_ID_CHANNEL)));
 650
 651     /* Replace the Channel ID */
 652     if (!silc_idlist_replace_channel_id(server->global_list, channel_id,
 653                                         channel_id2))
 654       if (!silc_idlist_replace_channel_id(server->local_list, channel_id,
 655                                           channel_id2)) {
 656         silc_free(channel_id2);
 657         channel_id2 = NULL;
 658       }
 659
 660     if (channel_id2) {
 661       SilcBuffer users = NULL;
 662
 663       /* Re-announce our clients on the channel as the ID has changed now */
 664       silc_server_announce_get_channel_users(server, channel, &users);
 665       if (users) {
 666         silc_buffer_push(users, users->data - users->head);
 667         silc_server_packet_send(server, sock,
 668                                 SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
 669                                 users->data, users->len, FALSE);
 670         silc_buffer_free(users);
 671       }
 672     }
 673
 674     silc_free(channel_id);
 675
 676     break;
 677
 678   case SILC_NOTIFY_TYPE_SERVER_SIGNOFF:
 679     /*
 680      * Remove the server entry and all clients that this server owns.
 681      */
 682
 683     SILC_LOG_DEBUG(("SERVER SIGNOFF notify"));
 684
 685     /* Get Server ID */
 686     tmp = silc_argument_get_arg_type(args, 1, &tmp_len);
 687     if (!tmp)
 688       goto out;
 689     server_id = silc_id_payload_parse_id(tmp, tmp_len);
 690     if (!server_id)
 691       goto out;
 692
 693     /* Get server entry */
 694     server_entry = silc_idlist_find_server_by_id(server->global_list,
 695                                                  server_id, NULL);
 696     if (!server_entry) {
 697       server_entry = silc_idlist_find_server_by_id(server->local_list,
 698                                                    server_id, NULL);
 699       if (!server_entry) {
 700         silc_free(server_id);
 701         goto out;
 702       }
 703     }
 704     silc_free(server_id);
 705
 706     /* Free all client entries that this server owns as they will
 707        become invalid now as well. */
 708     silc_server_remove_clients_by_server(server, server_entry, TRUE);
 709
 710     /* Remove the server entry */
 711     if (!silc_idlist_del_server(server->global_list, server_entry))
 712       silc_idlist_del_server(server->local_list, server_entry);
 713
 714     /* XXX update statistics */
 715
 716     break;
 717
 718   case SILC_NOTIFY_TYPE_KICKED:
 719     /*
 720      * Distribute the notify to local clients on the channel
 721      */
 722
 723     SILC_LOG_DEBUG(("KICKED notify"));
 724
 725     channel_id = silc_id_str2id(packet->dst_id, packet->dst_id_len,
 726                                 packet->dst_id_type);
 727     if (!channel_id)
 728       goto out;
 729
 730     /* Get channel entry */
 731     channel = silc_idlist_find_channel_by_id(server->global_list,
 732                                              channel_id, NULL);
 733     if (!channel) {
 734       channel = silc_idlist_find_channel_by_id(server->local_list,
 735                                                channel_id, NULL);
 736       if (!channel) {
 737         silc_free(channel_id);
 738         goto out;
 739       }
 740     }
 741     silc_free(channel_id);
 742
 743     /* Get client ID */
 744     tmp = silc_argument_get_arg_type(args, 1, &tmp_len);
 745     if (!tmp)
 746       goto out;
 747     client_id = silc_id_payload_parse_id(tmp, tmp_len);
 748     if (!client_id)
 749       goto out;
 750
 751     /* Send to channel */
 752     silc_server_packet_send_to_channel(server, sock, channel, packet->type,
 753                                        FALSE, packet->buffer->data,
 754                                        packet->buffer->len, FALSE);
 755
 756     /* If the the client is not in local list we check global list */
 757     client = silc_idlist_find_client_by_id(server->global_list,
 758                                            client_id, NULL);
 759     if (!client) {
 760       client = silc_idlist_find_client_by_id(server->local_list,
 761                                              client_id, NULL);
 762       if (!client) {
 763         silc_free(client_id);
 764         goto out;
 765       }
 766     }
 767
 768     /* Remove the client from channel */
 769     silc_server_remove_from_one_channel(server, sock, channel, client, FALSE);
 770
 771     break;
 772
 773   case SILC_NOTIFY_TYPE_KILLED:
 774     {
 775       /*
 776        * Distribute the notify to local clients on channels
 777        */
 778       unsigned char *id;
 779       uint32 id_len;
 780
 781       SILC_LOG_DEBUG(("KILLED notify"));
 782
 783       /* Get client ID */
 784       id = silc_argument_get_arg_type(args, 1, &id_len);
 785       if (!id)
 786         goto out;
 787       client_id = silc_id_payload_parse_id(id, id_len);
 788       if (!client_id)
 789         goto out;
 790
 791       /* If the the client is not in local list we check global list */
 792       client = silc_idlist_find_client_by_id(server->global_list,
 793                                              client_id, NULL);
 794       if (!client) {
 795         client = silc_idlist_find_client_by_id(server->local_list,
 796                                                client_id, NULL);
 797         if (!client) {
 798           silc_free(client_id);
 799           goto out;
 800         }
 801       }
 802       silc_free(client_id);
 803
 804       /* If the client is one of ours, then close the connection to the
 805          client now. This removes the client from all channels as well. */
 806       if (packet->dst_id_type == SILC_ID_CLIENT && client->data.registered &&
 807           client->connection) {
 808         sock = client->connection;
 809         silc_server_free_client_data(server, NULL, client, FALSE, NULL);
 810         silc_server_close_connection(server, sock);
 811         break;
 812       }
 813
 814       /* Get comment */
 815       tmp = silc_argument_get_arg_type(args, 2, &tmp_len);
 816       if (tmp_len > 128)
 817         tmp = NULL;
 818
 819       /* Send the notify to local clients on the channels except to the
 820          client who is killed. */
 821       silc_server_send_notify_on_channels(server, client, client,
 822                                           SILC_NOTIFY_TYPE_KILLED,
 823                                           tmp ? 2 : 1,
 824                                           id, id_len,
 825                                           tmp, tmp_len);
 826
 827       /* Remove the client from all channels */
 828       silc_server_remove_from_channels(server, NULL, client, FALSE, NULL,
 829                                        FALSE);
 830
 831       break;
 832     }
 833
 834   case SILC_NOTIFY_TYPE_UMODE_CHANGE:
 835     /*
 836      * Save the mode of the client.
 837      */
 838
 839     SILC_LOG_DEBUG(("UMODE_CHANGE notify"));
 840
 841     /* Get client ID */
 842     tmp = silc_argument_get_arg_type(args, 1, &tmp_len);
 843     if (!tmp)
 844       goto out;
 845     client_id = silc_id_payload_parse_id(tmp, tmp_len);
 846     if (!client_id)
 847       goto out;
 848
 849     /* Get client entry */
 850     client = silc_idlist_find_client_by_id(server->global_list,
 851                                            client_id, NULL);
 852     if (!client) {
 853       client = silc_idlist_find_client_by_id(server->local_list,
 854                                              client_id, NULL);
 855       if (!client) {
 856         silc_free(client_id);
 857         goto out;
 858       }
 859     }
 860     silc_free(client_id);
 861
 862     /* Get the mode */
 863     tmp = silc_argument_get_arg_type(args, 2, &tmp_len);
 864     if (!tmp)
 865       goto out;
 866
 867     /* Save the mode */
 868     SILC_GET32_MSB(client->mode, tmp);
 869
 870     break;
 871
 872   case SILC_NOTIFY_TYPE_BAN:
 873     /*
 874      * Save the ban
 875      */
 876
 877     SILC_LOG_DEBUG(("BAN notify"));
 878
 879     /* Get Channel ID */
 880     tmp = silc_argument_get_arg_type(args, 1, &tmp_len);
 881     if (!tmp)
 882       goto out;
 883     channel_id = silc_id_payload_parse_id(tmp, tmp_len);
 884     if (!channel_id)
 885       goto out;
 886
 887     /* Get channel entry */
 888     channel = silc_idlist_find_channel_by_id(server->global_list,
 889                                              channel_id, NULL);
 890     if (!channel) {
 891       channel = silc_idlist_find_channel_by_id(server->local_list,
 892                                                channel_id, NULL);
 893       if (!channel) {
 894         silc_free(channel_id);
 895         goto out;
 896       }
 897     }
 898     silc_free(channel_id);
 899
 900     /* Get the new ban and add it to the ban list */
 901     tmp = silc_argument_get_arg_type(args, 2, &tmp_len);
 902     if (tmp) {
 903       if (!channel->ban_list)
 904         channel->ban_list = silc_calloc(tmp_len + 2,
 905                                         sizeof(*channel->ban_list));
 906       else
 907         channel->ban_list = silc_realloc(channel->ban_list,
 908                                          sizeof(*channel->ban_list) *
 909                                          (tmp_len +
 910                                           strlen(channel->ban_list) + 2));
 911       strncat(channel->ban_list, tmp, tmp_len);
 912       strncat(channel->ban_list, ",", 1);
 913     }
 914
 915     /* Get the ban to be removed and remove it from the list */
 916     tmp = silc_argument_get_arg_type(args, 3, &tmp_len);
 917     if (tmp && channel->ban_list) {
 918       char *start, *end, *n;
 919
 920       if (!strcmp(channel->ban_list, tmp)) {
 921         silc_free(channel->ban_list);
 922         channel->ban_list = NULL;
 923       } else {
 924         start = strstr(channel->ban_list, tmp);
 925         if (start && strlen(start) >= tmp_len) {
 926           end = start + tmp_len;
 927           n = silc_calloc(strlen(channel->ban_list) - tmp_len, sizeof(*n));
 928           strncat(n, channel->ban_list, start - channel->ban_list);
 929           strncat(n, end + 1, ((channel->ban_list +
 930                                 strlen(channel->ban_list)) - end) - 1);
 931           silc_free(channel->ban_list);
 932           channel->ban_list = n;
 933         }
 934       }
 935     }
 936
 937     break;
 938
 939     /* Ignore rest of the notify types for now */
 940   case SILC_NOTIFY_TYPE_NONE:
 941   case SILC_NOTIFY_TYPE_MOTD:
 942     break;
 943   default:
 944     break;
 945   }
 946
 947  out:
 948   silc_notify_payload_free(payload);
 949 }
 950
 951 void silc_server_notify_list(SilcServer server,
 952                              SilcSocketConnection sock,
 953                              SilcPacketContext *packet)
 954 {
 955   SilcPacketContext *new;
 956   SilcBuffer buffer;
 957   uint16 len;
 958
 959   SILC_LOG_DEBUG(("Processing New Notify List"));
 960
 961   if (sock->type == SILC_SOCKET_TYPE_CLIENT ||
 962       packet->src_id_type != SILC_ID_SERVER)
 963     return;
 964
 965   /* Make copy of the original packet context, except for the actual
 966      data buffer, which we will here now fetch from the original buffer. */
 967   new = silc_packet_context_alloc();
 968   new->type = SILC_PACKET_NOTIFY;
 969   new->flags = packet->flags;
 970   new->src_id = packet->src_id;
 971   new->src_id_len = packet->src_id_len;
 972   new->src_id_type = packet->src_id_type;
 973   new->dst_id = packet->dst_id;
 974   new->dst_id_len = packet->dst_id_len;
 975   new->dst_id_type = packet->dst_id_type;
 976
 977   buffer = silc_buffer_alloc(1024);
 978   new->buffer = buffer;
 979
 980   while (packet->buffer->len) {
 981     SILC_GET16_MSB(len, packet->buffer->data + 2);
 982     if (len > packet->buffer->len)
 983       break;
 984
 985     if (len > buffer->truelen) {
 986       silc_buffer_free(buffer);
 987       buffer = silc_buffer_alloc(1024 + len);
 988     }
 989
 990     silc_buffer_pull_tail(buffer, len);
 991     silc_buffer_put(buffer, packet->buffer->data, len);
 992
 993     /* Process the Notify */
 994     silc_server_notify(server, sock, new);
 995
 996     silc_buffer_push_tail(buffer, len);
 997     silc_buffer_pull(packet->buffer, len);
 998   }
 999
1000   silc_buffer_free(buffer);
1001   silc_free(new);
1002 }
1003
1004 /* Received private message. This resolves the destination of the message
1005    and sends the packet. This is used by both server and router.  If the
1006    destination is our locally connected client this sends the packet to
1007    the client. This may also send the message for further routing if
1008    the destination is not in our server (or router). */
1009
1010 void silc_server_private_message(SilcServer server,
1011                                  SilcSocketConnection sock,
1012                                  SilcPacketContext *packet)
1013 {
1014   SilcSocketConnection dst_sock;
1015   SilcIDListData idata;
1016
1017   SILC_LOG_DEBUG(("Start"));
1018
1019   if (packet->src_id_type != SILC_ID_CLIENT ||
1020       packet->dst_id_type != SILC_ID_CLIENT)
1021     return;
1022
1023   if (!packet->dst_id)
1024     return;
1025
1026   /* Get the route to the client */
1027   dst_sock = silc_server_get_client_route(server, packet->dst_id,
1028                                           packet->dst_id_len, NULL, &idata);
1029   if (!dst_sock)
1030     return;
1031
1032   /* Send the private message */
1033   silc_server_send_private_message(server, dst_sock, idata->send_key,
1034                                    idata->hmac_send, packet);
1035 }
1036
1037 /* Received private message key packet.. This packet is never for us. It is to
1038    the client in the packet's destination ID. Sending of this sort of packet
1039    equals sending private message, ie. it is sent point to point from
1040    one client to another. */
1041
1042 void silc_server_private_message_key(SilcServer server,
1043                                      SilcSocketConnection sock,
1044                                      SilcPacketContext *packet)
1045 {
1046   SilcSocketConnection dst_sock;
1047   SilcIDListData idata;
1048
1049   SILC_LOG_DEBUG(("Start"));
1050
1051   if (packet->src_id_type != SILC_ID_CLIENT ||
1052       packet->dst_id_type != SILC_ID_CLIENT)
1053     return;
1054
1055   if (!packet->dst_id)
1056     return;
1057
1058   /* Get the route to the client */
1059   dst_sock = silc_server_get_client_route(server, packet->dst_id,
1060                                           packet->dst_id_len, NULL, &idata);
1061   if (!dst_sock)
1062     return;
1063
1064   /* Relay the packet */
1065   silc_server_relay_packet(server, dst_sock, idata->send_key,
1066                            idata->hmac_send, packet, FALSE);
1067 }
1068
1069 /* Processes incoming command reply packet. The command reply packet may
1070    be destined to one of our clients or it may directly for us. We will
1071    call the command reply routine after processing the packet. */
1072
1073 void silc_server_command_reply(SilcServer server,
1074                                SilcSocketConnection sock,
1075                                SilcPacketContext *packet)
1076 {
1077   SilcBuffer buffer = packet->buffer;
1078   SilcClientEntry client = NULL;
1079   SilcSocketConnection dst_sock;
1080   SilcIDListData idata;
1081   SilcClientID *id = NULL;
1082
1083   SILC_LOG_DEBUG(("Start"));
1084
1085   /* Source must be server or router */
1086   if (packet->src_id_type != SILC_ID_SERVER &&
1087       sock->type != SILC_SOCKET_TYPE_ROUTER)
1088     return;
1089
1090   if (packet->dst_id_type == SILC_ID_CHANNEL)
1091     return;
1092
1093   if (packet->dst_id_type == SILC_ID_CLIENT) {
1094     /* Destination must be one of ours */
1095     id = silc_id_str2id(packet->dst_id, packet->dst_id_len, SILC_ID_CLIENT);
1096     if (!id)
1097       return;
1098     client = silc_idlist_find_client_by_id(server->local_list, id, NULL);
1099     if (!client) {
1100       SILC_LOG_ERROR(("Cannot process command reply to unknown client"));
1101       silc_free(id);
1102       return;
1103     }
1104   }
1105
1106   if (packet->dst_id_type == SILC_ID_SERVER) {
1107     /* For now this must be for us */
1108     if (SILC_ID_SERVER_COMPARE(packet->dst_id, server->id_string)) {
1109       SILC_LOG_ERROR(("Cannot process command reply to unknown server"));
1110       return;
1111     }
1112   }
1113
1114   /* Execute command reply locally for the command */
1115   silc_server_command_reply_process(server, sock, buffer);
1116
1117   if (packet->dst_id_type == SILC_ID_CLIENT && client && id) {
1118     /* Relay the packet to the client */
1119
1120     dst_sock = (SilcSocketConnection)client->connection;
1121     silc_buffer_push(buffer, SILC_PACKET_HEADER_LEN + packet->src_id_len
1122                      + packet->dst_id_len + packet->padlen);
1123
1124     silc_packet_send_prepare(dst_sock, 0, 0, buffer->len);
1125     silc_buffer_put(dst_sock->outbuf, buffer->data, buffer->len);
1126
1127     idata = (SilcIDListData)client;
1128
1129     /* Encrypt packet */
1130     silc_packet_encrypt(idata->send_key, idata->hmac_send, dst_sock->outbuf,
1131                         buffer->len);
1132
1133     /* Send the packet */
1134     silc_server_packet_send_real(server, dst_sock, TRUE);
1135
1136     silc_free(id);
1137   }
1138 }
1139
1140 /* Process received channel message. The message can be originated from
1141    client or server. */
1142
1143 void silc_server_channel_message(SilcServer server,
1144                                  SilcSocketConnection sock,
1145                                  SilcPacketContext *packet)
1146 {
1147   SilcChannelEntry channel = NULL;
1148   SilcChannelClientEntry chl;
1149   SilcChannelID *id = NULL;
1150   void *sender = NULL;
1151
1152   SILC_LOG_DEBUG(("Processing channel message"));
1153
1154   /* Sanity checks */
1155   if (packet->dst_id_type != SILC_ID_CHANNEL) {
1156     SILC_LOG_DEBUG(("Received bad message for channel, dropped"));
1157     goto out;
1158   }
1159
1160   /* Find channel entry */
1161   id = silc_id_str2id(packet->dst_id, packet->dst_id_len, SILC_ID_CHANNEL);
1162   if (!id)
1163     goto out;
1164   channel = silc_idlist_find_channel_by_id(server->local_list, id, NULL);
1165   if (!channel) {
1166     channel = silc_idlist_find_channel_by_id(server->global_list, id, NULL);
1167     if (!channel) {
1168       SILC_LOG_DEBUG(("Could not find channel"));
1169       goto out;
1170     }
1171   }
1172
1173   /* See that this client is on the channel. If the message is coming
1174      from router we won't do the check as the message is from client that
1175      we don't know about. Also, if the original sender is not client
1176      (as it can be server as well) we don't do the check. */
1177   sender = silc_id_str2id(packet->src_id, packet->src_id_len,
1178                           packet->src_id_type);
1179   if (!sender)
1180     goto out;
1181   if (sock->type != SILC_SOCKET_TYPE_ROUTER &&
1182       packet->src_id_type == SILC_ID_CLIENT) {
1183     silc_list_start(channel->user_list);
1184     while ((chl = silc_list_get(channel->user_list)) != SILC_LIST_END) {
1185       if (chl->client && !SILC_ID_CLIENT_COMPARE(chl->client->id, sender))
1186         break;
1187     }
1188     if (chl == SILC_LIST_END) {
1189       SILC_LOG_DEBUG(("Client not on channel"));
1190       goto out;
1191     }
1192   }
1193
1194
1195   /* Distribute the packet to our local clients. This will send the
1196      packet for further routing as well, if needed. */
1197   silc_server_packet_relay_to_channel(server, sock, channel, sender,
1198                                       packet->src_id_type,
1199                                       packet->buffer->data,
1200                                       packet->buffer->len, FALSE);
1201
1202  out:
1203   if (sender)
1204     silc_free(sender);
1205   if (id)
1206     silc_free(id);
1207 }
1208
1209 /* Received channel key packet. We distribute the key to all of our locally
1210    connected clients on the channel. */
1211
1212 void silc_server_channel_key(SilcServer server,
1213                              SilcSocketConnection sock,
1214                              SilcPacketContext *packet)
1215 {
1216   SilcBuffer buffer = packet->buffer;
1217   SilcChannelEntry channel;
1218
1219   if (packet->src_id_type != SILC_ID_SERVER ||
1220       (server->server_type == SILC_ROUTER &&
1221        sock->type == SILC_SOCKET_TYPE_ROUTER))
1222     return;
1223
1224   /* Save the channel key */
1225   channel = silc_server_save_channel_key(server, buffer, NULL);
1226   if (!channel)
1227     return;
1228
1229   /* Distribute the key to everybody who is on the channel. If we are router
1230      we will also send it to locally connected servers. */
1231   silc_server_send_channel_key(server, sock, channel, FALSE);
1232 }
1233
1234 /* Received New Client packet and processes it.  Creates Client ID for the
1235    client. Client becomes registered after calling this functions. */
1236
1237 SilcClientEntry silc_server_new_client(SilcServer server,
1238                                        SilcSocketConnection sock,
1239                                        SilcPacketContext *packet)
1240 {
1241   SilcBuffer buffer = packet->buffer;
1242   SilcClientEntry client;
1243   SilcIDCacheEntry cache;
1244   SilcClientID *client_id;
1245   SilcBuffer reply;
1246   SilcIDListData idata;
1247   char *username = NULL, *realname = NULL, *id_string;
1248   int ret;
1249
1250   SILC_LOG_DEBUG(("Creating new client"));
1251
1252   if (sock->type != SILC_SOCKET_TYPE_CLIENT)
1253     return NULL;
1254
1255   /* Take client entry */
1256   client = (SilcClientEntry)sock->user_data;
1257   idata = (SilcIDListData)client;
1258
1259   /* Fetch the old client cache entry so that we can update it. */
1260   if (!silc_idcache_find_by_context(server->local_list->clients,
1261                                     sock->user_data, &cache)) {
1262     SILC_LOG_ERROR(("Lost client's cache entry - bad thing"));
1263     silc_server_disconnect_remote(server, sock, "Server closed connection: "
1264                                   "Unknown client");
1265     return NULL;
1266   }
1267
1268   /* Parse incoming packet */
1269   ret = silc_buffer_unformat(buffer,
1270                              SILC_STR_UI16_STRING_ALLOC(&username),
1271                              SILC_STR_UI16_STRING_ALLOC(&realname),
1272                              SILC_STR_END);
1273   if (ret == -1) {
1274     if (username)
1275       silc_free(username);
1276     if (realname)
1277       silc_free(realname);
1278     silc_server_disconnect_remote(server, sock, "Server closed connection: "
1279                                   "Incomplete client information");
1280     return NULL;
1281   }
1282
1283   if (!username) {
1284     silc_free(username);
1285     if (realname)
1286       silc_free(realname);
1287     silc_server_disconnect_remote(server, sock, "Server closed connection: "
1288                                   "Incomplete client information");
1289     return NULL;
1290   }
1291
1292   /* Create Client ID */
1293   silc_id_create_client_id(server->id, server->rng, server->md5hash,
1294                            username, &client_id);
1295
1296   if (strlen(username) > 128)
1297     username[127] = '\0';
1298
1299   /* Update client entry */
1300   idata->registered = TRUE;
1301   client->nickname = strdup(username);
1302   client->username = username;
1303   client->userinfo = realname ? realname : strdup(" ");
1304   client->id = client_id;
1305
1306   /* Update the cache entry */
1307   cache->id = (void *)client_id;
1308   cache->type = SILC_ID_CLIENT;
1309   cache->data = username;
1310   cache->data_len = strlen(username);
1311   silc_idcache_sort_by_data(server->local_list->clients);
1312
1313   /* Notify our router about new client on the SILC network */
1314   if (!server->standalone)
1315     silc_server_send_new_id(server, (SilcSocketConnection)
1316                             server->router->connection,
1317                             server->server_type == SILC_ROUTER ? TRUE : FALSE,
1318                             client->id, SILC_ID_CLIENT, SILC_ID_CLIENT_LEN);
1319
1320   /* Send the new client ID to the client. */
1321   id_string = silc_id_id2str(client->id, SILC_ID_CLIENT);
1322   reply = silc_buffer_alloc(2 + 2 + SILC_ID_CLIENT_LEN);
1323   silc_buffer_pull_tail(reply, SILC_BUFFER_END(reply));
1324   silc_buffer_format(reply,
1325                      SILC_STR_UI_SHORT(SILC_ID_CLIENT),
1326                      SILC_STR_UI_SHORT(SILC_ID_CLIENT_LEN),
1327                      SILC_STR_UI_XNSTRING(id_string, SILC_ID_CLIENT_LEN),
1328                      SILC_STR_END);
1329   silc_server_packet_send(server, sock, SILC_PACKET_NEW_ID, 0,
1330                           reply->data, reply->len, FALSE);
1331   silc_free(id_string);
1332   silc_buffer_free(reply);
1333
1334   /* Send some nice info to the client */
1335   SILC_SERVER_SEND_NOTIFY(server, sock, SILC_NOTIFY_TYPE_NONE,
1336                           ("Welcome to the SILC Network %s@%s",
1337                            username, sock->hostname));
1338   SILC_SERVER_SEND_NOTIFY(server, sock, SILC_NOTIFY_TYPE_NONE,
1339                           ("Your host is %s, running version %s",
1340                            server->config->server_info->server_name,
1341                            server_version));
1342   if (server->server_type == SILC_ROUTER) {
1343     SILC_SERVER_SEND_NOTIFY(server, sock, SILC_NOTIFY_TYPE_NONE,
1344                             ("There are %d clients on %d servers in SILC "
1345                              "Network", server->stat.clients,
1346                              server->stat.servers + 1));
1347     SILC_SERVER_SEND_NOTIFY(server, sock, SILC_NOTIFY_TYPE_NONE,
1348                             ("There are %d clients on %d server in our cell",
1349                              server->stat.cell_clients,
1350                              server->stat.cell_servers + 1));
1351     SILC_SERVER_SEND_NOTIFY(server, sock, SILC_NOTIFY_TYPE_NONE,
1352                             ("I have %d clients, %d channels, %d servers and "
1353                              "%d routers",
1354                              server->stat.my_clients,
1355                              server->stat.my_channels,
1356                              server->stat.my_servers,
1357                              server->stat.my_routers));
1358     SILC_SERVER_SEND_NOTIFY(server, sock, SILC_NOTIFY_TYPE_NONE,
1359                             ("%d server operators and %d router operators "
1360                              "online",
1361                              server->stat.my_server_ops,
1362                              server->stat.my_router_ops));
1363   } else {
1364     SILC_SERVER_SEND_NOTIFY(server, sock, SILC_NOTIFY_TYPE_NONE,
1365                             ("I have %d clients and %d channels formed",
1366                              server->stat.my_clients,
1367                              server->stat.my_channels));
1368     SILC_SERVER_SEND_NOTIFY(server, sock, SILC_NOTIFY_TYPE_NONE,
1369                             ("%d operators online",
1370                              server->stat.my_server_ops));
1371   }
1372   SILC_SERVER_SEND_NOTIFY(server, sock, SILC_NOTIFY_TYPE_NONE,
1373                           ("Your connection is secured with %s cipher, "
1374                            "key length %d bits",
1375                            idata->send_key->cipher->name,
1376                            idata->send_key->cipher->key_len));
1377   SILC_SERVER_SEND_NOTIFY(server, sock, SILC_NOTIFY_TYPE_NONE,
1378                           ("Your current nickname is %s",
1379                            client->nickname));
1380
1381   /* Send motd */
1382   silc_server_send_motd(server, sock);
1383
1384   return client;
1385 }
1386
1387 /* Create new server. This processes received New Server packet and
1388    saves the received Server ID. The server is our locally connected
1389    server thus we save all the information and save it to local list.
1390    This funtion can be used by both normal server and router server.
1391    If normal server uses this it means that its router has connected
1392    to the server. If router uses this it means that one of the cell's
1393    servers is connected to the router. */
1394
1395 SilcServerEntry silc_server_new_server(SilcServer server,
1396                                        SilcSocketConnection sock,
1397                                        SilcPacketContext *packet)
1398 {
1399   SilcBuffer buffer = packet->buffer;
1400   SilcServerEntry new_server;
1401   SilcIDCacheEntry cache;
1402   SilcServerID *server_id;
1403   SilcIDListData idata;
1404   unsigned char *server_name, *id_string;
1405   uint16 id_len, name_len;
1406   int ret;
1407
1408   SILC_LOG_DEBUG(("Creating new server"));
1409
1410   if (sock->type != SILC_SOCKET_TYPE_SERVER &&
1411       sock->type != SILC_SOCKET_TYPE_ROUTER)
1412     return NULL;
1413
1414   /* Take server entry */
1415   new_server = (SilcServerEntry)sock->user_data;
1416   idata = (SilcIDListData)new_server;
1417
1418   /* Fetch the old server cache entry so that we can update it. */
1419   if (!silc_idcache_find_by_context(server->local_list->servers,
1420                                     sock->user_data, &cache)) {
1421     SILC_LOG_ERROR(("Lost server's cache entry - bad thing"));
1422     return NULL;
1423   }
1424
1425   /* Parse the incoming packet */
1426   ret = silc_buffer_unformat(buffer,
1427                              SILC_STR_UI16_NSTRING_ALLOC(&id_string, &id_len),
1428                              SILC_STR_UI16_NSTRING_ALLOC(&server_name,
1429                                                          &name_len),
1430                              SILC_STR_END);
1431   if (ret == -1) {
1432     if (id_string)
1433       silc_free(id_string);
1434     if (server_name)
1435       silc_free(server_name);
1436     return NULL;
1437   }
1438
1439   if (id_len > buffer->len) {
1440     silc_free(id_string);
1441     silc_free(server_name);
1442     return NULL;
1443   }
1444
1445   if (name_len > 256)
1446     server_name[255] = '\0';
1447
1448   /* Get Server ID */
1449   server_id = silc_id_str2id(id_string, id_len, SILC_ID_SERVER);
1450   if (!server_id) {
1451     silc_free(id_string);
1452     silc_free(server_name);
1453     return NULL;
1454   }
1455   silc_free(id_string);
1456
1457   /* Update client entry */
1458   idata->registered = TRUE;
1459   new_server->server_name = server_name;
1460   new_server->id = server_id;
1461
1462   /* Update the cache entry */
1463   cache->id = (void *)server_id;
1464   cache->type = SILC_ID_SERVER;
1465   cache->data = server_name;
1466   cache->data_len = strlen(server_name);
1467   silc_idcache_sort_by_data(server->local_list->servers);
1468
1469   /* Distribute the information about new server in the SILC network
1470      to our router. If we are normal server we won't send anything
1471      since this connection must be our router connection. */
1472   if (server->server_type == SILC_ROUTER && !server->standalone &&
1473       server->router->connection != sock)
1474     silc_server_send_new_id(server, server->router->connection,
1475                             TRUE, new_server->id, SILC_ID_SERVER,
1476                             SILC_ID_SERVER_LEN);
1477
1478   if (server->server_type == SILC_ROUTER)
1479     server->stat.cell_servers++;
1480
1481   return new_server;
1482 }
1483
1484 /* Processes incoming New ID packet. New ID Payload is used to distribute
1485    information about newly registered clients and servers. */
1486
1487 static void silc_server_new_id_real(SilcServer server,
1488                                     SilcSocketConnection sock,
1489                                     SilcPacketContext *packet,
1490                                     int broadcast)
1491 {
1492   SilcBuffer buffer = packet->buffer;
1493   SilcIDList id_list;
1494   SilcServerEntry router;
1495   SilcSocketConnection router_sock;
1496   SilcIDPayload idp;
1497   SilcIdType id_type;
1498   unsigned char *hash = NULL;
1499   void *id;
1500
1501   SILC_LOG_DEBUG(("Processing new ID"));
1502
1503   if (sock->type == SILC_SOCKET_TYPE_CLIENT ||
1504       server->server_type == SILC_SERVER ||
1505       packet->src_id_type != SILC_ID_SERVER)
1506     return;
1507
1508   idp = silc_id_payload_parse(buffer);
1509   if (!idp)
1510     return;
1511
1512   id_type = silc_id_payload_get_type(idp);
1513
1514   /* Normal server cannot have other normal server connections */
1515   if (id_type == SILC_ID_SERVER && sock->type == SILC_SOCKET_TYPE_SERVER)
1516     goto out;
1517
1518   id = silc_id_payload_get_id(idp);
1519   if (!id)
1520     goto out;
1521
1522   /* If the sender of this packet is server and we are router we need to
1523      broadcast this packet to other routers in the network. */
1524   if (broadcast && !server->standalone && server->server_type == SILC_ROUTER &&
1525       sock->type == SILC_SOCKET_TYPE_SERVER &&
1526       !(packet->flags & SILC_PACKET_FLAG_BROADCAST)) {
1527     SILC_LOG_DEBUG(("Broadcasting received New ID packet"));
1528     silc_server_packet_send(server, server->router->connection,
1529                             packet->type,
1530                             packet->flags | SILC_PACKET_FLAG_BROADCAST,
1531                             buffer->data, buffer->len, FALSE);
1532   }
1533
1534   if (sock->type == SILC_SOCKET_TYPE_SERVER)
1535     id_list = server->local_list;
1536   else
1537     id_list = server->global_list;
1538
1539   router_sock = sock;
1540   router = sock->user_data;
1541
1542   switch(id_type) {
1543   case SILC_ID_CLIENT:
1544     {
1545       SilcClientEntry entry;
1546
1547       SILC_LOG_DEBUG(("New client id(%s) from [%s] %s",
1548                       silc_id_render(id, SILC_ID_CLIENT),
1549                       sock->type == SILC_SOCKET_TYPE_SERVER ?
1550                       "Server" : "Router", sock->hostname));
1551
1552       /* As a router we keep information of all global information in our
1553          global list. Cell wide information however is kept in the local
1554          list. The client is put to global list and we will take the hash
1555          value of the Client ID and save it to the ID Cache system for fast
1556          searching in the future. */
1557       hash = silc_calloc(sizeof(((SilcClientID *)id)->hash),
1558                          sizeof(unsigned char));
1559       memcpy(hash, ((SilcClientID *)id)->hash,
1560              sizeof(((SilcClientID *)id)->hash));
1561       entry = silc_idlist_add_client(id_list, hash,
1562                                      sizeof(((SilcClientID *)id)->hash),
1563                                      NULL, NULL, id, router, NULL);
1564       entry->nickname = NULL;
1565       entry->data.registered = TRUE;
1566
1567       if (sock->type == SILC_SOCKET_TYPE_SERVER)
1568         server->stat.cell_clients++;
1569       server->stat.clients++;
1570     }
1571     break;
1572
1573   case SILC_ID_SERVER:
1574     /* If the ID is mine, ignore it. */
1575     if (!SILC_ID_SERVER_COMPARE(id, server->id)) {
1576       SILC_LOG_DEBUG(("Ignoring my own ID as new ID"));
1577       break;
1578     }
1579
1580     SILC_LOG_DEBUG(("New server id(%s) from [%s] %s",
1581                     silc_id_render(id, SILC_ID_SERVER),
1582                     sock->type == SILC_SOCKET_TYPE_SERVER ?
1583                     "Server" : "Router", sock->hostname));
1584
1585     /* As a router we keep information of all global information in our global
1586        list. Cell wide information however is kept in the local list. */
1587     silc_idlist_add_server(id_list, NULL, 0, id, router, router_sock);
1588
1589     if (sock->type == SILC_SOCKET_TYPE_SERVER)
1590       server->stat.cell_servers++;
1591     server->stat.servers++;
1592     break;
1593
1594   case SILC_ID_CHANNEL:
1595     SILC_LOG_ERROR(("Channel cannot be registered with NEW_ID packet"));
1596     break;
1597
1598   default:
1599     break;
1600   }
1601
1602  out:
1603   silc_id_payload_free(idp);
1604 }
1605
1606
1607 /* Processes incoming New ID packet. New ID Payload is used to distribute
1608    information about newly registered clients and servers. */
1609
1610 void silc_server_new_id(SilcServer server, SilcSocketConnection sock,
1611                         SilcPacketContext *packet)
1612 {
1613   silc_server_new_id_real(server, sock, packet, TRUE);
1614 }
1615
1616 /* Receoved New Id List packet, list of New ID payloads inside one
1617    packet. Process the New ID payloads one by one. */
1618
1619 void silc_server_new_id_list(SilcServer server, SilcSocketConnection sock,
1620                              SilcPacketContext *packet)
1621 {
1622   SilcPacketContext *new_id;
1623   SilcBuffer idp;
1624   uint16 id_len;
1625
1626   SILC_LOG_DEBUG(("Processing New ID List"));
1627
1628   if (sock->type == SILC_SOCKET_TYPE_CLIENT ||
1629       packet->src_id_type != SILC_ID_SERVER)
1630     return;
1631
1632   /* If the sender of this packet is server and we are router we need to
1633      broadcast this packet to other routers in the network. Broadcast
1634      this list packet instead of multiple New ID packets. */
1635   if (!server->standalone && server->server_type == SILC_ROUTER &&
1636       sock->type == SILC_SOCKET_TYPE_SERVER &&
1637       !(packet->flags & SILC_PACKET_FLAG_BROADCAST)) {
1638     SILC_LOG_DEBUG(("Broadcasting received New ID List packet"));
1639     silc_server_packet_send(server, server->router->connection,
1640                             packet->type,
1641                             packet->flags | SILC_PACKET_FLAG_BROADCAST,
1642                             packet->buffer->data, packet->buffer->len, FALSE);
1643   }
1644
1645   /* Make copy of the original packet context, except for the actual
1646      data buffer, which we will here now fetch from the original buffer. */
1647   new_id = silc_packet_context_alloc();
1648   new_id->type = SILC_PACKET_NEW_ID;
1649   new_id->flags = packet->flags;
1650   new_id->src_id = packet->src_id;
1651   new_id->src_id_len = packet->src_id_len;
1652   new_id->src_id_type = packet->src_id_type;
1653   new_id->dst_id = packet->dst_id;
1654   new_id->dst_id_len = packet->dst_id_len;
1655   new_id->dst_id_type = packet->dst_id_type;
1656
1657   idp = silc_buffer_alloc(256);
1658   new_id->buffer = idp;
1659
1660   while (packet->buffer->len) {
1661     SILC_GET16_MSB(id_len, packet->buffer->data + 2);
1662     if ((id_len > packet->buffer->len) ||
1663         (id_len > idp->truelen))
1664       break;
1665
1666     silc_buffer_pull_tail(idp, 4 + id_len);
1667     silc_buffer_put(idp, packet->buffer->data, 4 + id_len);
1668
1669     /* Process the New ID */
1670     silc_server_new_id_real(server, sock, new_id, FALSE);
1671
1672     silc_buffer_push_tail(idp, 4 + id_len);
1673     silc_buffer_pull(packet->buffer, 4 + id_len);
1674   }
1675
1676   silc_buffer_free(idp);
1677   silc_free(new_id);
1678 }
1679
1680 /* Received New Channel packet. Information about new channels in the
1681    network are distributed using this packet. Save the information about
1682    the new channel. This usually comes from router but also normal server
1683    can send this to notify channels it has when it connects to us. */
1684
1685 void silc_server_new_channel(SilcServer server,
1686                              SilcSocketConnection sock,
1687                              SilcPacketContext *packet)
1688 {
1689   SilcChannelPayload payload;
1690   SilcChannelID *channel_id;
1691   char *channel_name;
1692   uint32 name_len;
1693   unsigned char *id;
1694   uint32 id_len;
1695   uint32 mode;
1696
1697   SILC_LOG_DEBUG(("Processing New Channel"));
1698
1699   if (sock->type == SILC_SOCKET_TYPE_CLIENT ||
1700       packet->src_id_type != SILC_ID_SERVER ||
1701       server->server_type == SILC_SERVER)
1702     return;
1703
1704   /* Parse the channel payload */
1705   payload = silc_channel_payload_parse(packet->buffer);
1706   if (!payload)
1707     return;
1708
1709   /* Get the channel ID */
1710   channel_id = silc_channel_get_id_parse(payload);
1711   if (!channel_id) {
1712     silc_channel_payload_free(payload);
1713     return;
1714   }
1715
1716   channel_name = silc_channel_get_name(payload, &name_len);
1717   if (name_len > 256)
1718     channel_name[255] = '\0';
1719
1720   id = silc_channel_get_id(payload, &id_len);
1721
1722   if (sock->type == SILC_SOCKET_TYPE_ROUTER) {
1723     /* Add the server to global list as it is coming from router. It
1724        cannot be our own channel as it is coming from router. */
1725
1726     SILC_LOG_DEBUG(("New channel id(%s) from [Router] %s",
1727                     silc_id_render(channel_id, SILC_ID_CHANNEL),
1728                     sock->hostname));
1729
1730     silc_idlist_add_channel(server->global_list, strdup(channel_name),
1731                             0, channel_id, server->router->connection,
1732                             NULL, NULL);
1733
1734     server->stat.channels++;
1735   } else {
1736     /* The channel is coming from our server, thus it is in our cell
1737        we will add it to our local list. */
1738     SilcChannelEntry channel;
1739     SilcBuffer chk;
1740
1741     SILC_LOG_DEBUG(("New channel id(%s) from [Server] %s",
1742                     silc_id_render(channel_id, SILC_ID_CHANNEL),
1743                     sock->hostname));
1744
1745     /* Check that we don't already have this channel */
1746     channel = silc_idlist_find_channel_by_name(server->local_list,
1747                                                channel_name, NULL);
1748     if (!channel)
1749       channel = silc_idlist_find_channel_by_name(server->global_list,
1750                                                  channel_name, NULL);
1751
1752     /* If the channel does not exist, then create it. We create the channel
1753        with the channel ID provided by the server. This creates a new
1754        key to the channel as well that we will send to the server. */
1755     if (!channel) {
1756       channel = silc_server_create_new_channel_with_id(server, NULL, NULL,
1757                                                        channel_name,
1758                                                        channel_id, FALSE);
1759       if (!channel) {
1760         silc_channel_payload_free(payload);
1761         silc_free(channel_id);
1762         return;
1763       }
1764
1765       /* Send the new channel key to the server */
1766       chk = silc_channel_key_payload_encode(id_len, id,
1767                                             strlen(channel->channel_key->
1768                                                    cipher->name),
1769                                             channel->channel_key->cipher->name,
1770                                             channel->key_len / 8,
1771                                             channel->key);
1772       silc_server_packet_send(server, sock, SILC_PACKET_CHANNEL_KEY, 0,
1773                               chk->data, chk->len, FALSE);
1774       silc_buffer_free(chk);
1775
1776     } else {
1777       /* The channel exist by that name, check whether the ID's match.
1778          If they don't then we'll force the server to use the ID we have.
1779          We also create a new key for the channel. */
1780       SilcBuffer users = NULL;
1781
1782       if (!channel->id)
1783         channel_id = silc_id_dup(channel_id, SILC_ID_CHANNEL);
1784
1785       if (SILC_ID_CHANNEL_COMPARE(channel_id, channel->id)) {
1786         /* They don't match, send CHANNEL_CHANGE notify to the server to
1787            force the ID change. */
1788         SILC_LOG_DEBUG(("Forcing the server to change Channel ID"));
1789         silc_server_send_notify_channel_change(server, sock, FALSE,
1790                                                channel_id,
1791                                                channel->id,
1792                                                SILC_ID_CHANNEL_LEN);
1793       }
1794
1795       /* If the mode is different from what we have then enforce the
1796          mode change. */
1797       mode = silc_channel_get_mode(payload);
1798       if (channel->mode != mode) {
1799         SILC_LOG_DEBUG(("Forcing the server to change channel mode"));
1800         silc_server_send_notify_cmode(server, sock, FALSE, channel,
1801                                       channel->mode, server->id,
1802                                       SILC_ID_SERVER, SILC_ID_SERVER_LEN,
1803                                       channel->cipher, channel->hmac_name);
1804       }
1805
1806       /* Create new key for the channel and send it to the server and
1807          everybody else possibly on the channel. */
1808
1809       if (!(channel->mode & SILC_CHANNEL_MODE_PRIVKEY)) {
1810         silc_server_create_channel_key(server, channel, 0);
1811
1812         /* Send to the channel */
1813         silc_server_send_channel_key(server, sock, channel, FALSE);
1814         id = silc_id_id2str(channel->id, SILC_ID_CHANNEL);
1815         id_len = SILC_ID_CHANNEL_LEN;
1816
1817         /* Send to the server */
1818         chk = silc_channel_key_payload_encode(id_len, id,
1819                                               strlen(channel->channel_key->
1820                                                      cipher->name),
1821                                               channel->channel_key->
1822                                               cipher->name,
1823                                               channel->key_len / 8,
1824                                               channel->key);
1825         silc_server_packet_send(server, sock, SILC_PACKET_CHANNEL_KEY, 0,
1826                                 chk->data, chk->len, FALSE);
1827         silc_buffer_free(chk);
1828         silc_free(id);
1829       }
1830
1831       silc_free(channel_id);
1832
1833       /* Since the channel is coming from server and we also know about it
1834          then send the JOIN notify to the server so that it see's our
1835          users on the channel "joining" the channel. */
1836       silc_server_announce_get_channel_users(server, channel, &users);
1837       if (users) {
1838         silc_buffer_push(users, users->data - users->head);
1839         silc_server_packet_send(server, sock,
1840                                 SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
1841                                 users->data, users->len, FALSE);
1842         silc_buffer_free(users);
1843       }
1844     }
1845   }
1846
1847   silc_channel_payload_free(payload);
1848 }
1849
1850 /* Received New Channel List packet, list of New Channel List payloads inside
1851    one packet. Process the New Channel payloads one by one. */
1852
1853 void silc_server_new_channel_list(SilcServer server,
1854                                   SilcSocketConnection sock,
1855                                   SilcPacketContext *packet)
1856 {
1857   SilcPacketContext *new;
1858   SilcBuffer buffer;
1859   uint16 len1, len2;
1860
1861   SILC_LOG_DEBUG(("Processing New Channel List"));
1862
1863   if (sock->type == SILC_SOCKET_TYPE_CLIENT ||
1864       packet->src_id_type != SILC_ID_SERVER ||
1865       server->server_type == SILC_SERVER)
1866     return;
1867
1868   /* If the sender of this packet is server and we are router we need to
1869      broadcast this packet to other routers in the network. Broadcast
1870      this list packet instead of multiple New Channel packets. */
1871   if (!server->standalone && server->server_type == SILC_ROUTER &&
1872       sock->type == SILC_SOCKET_TYPE_SERVER &&
1873       !(packet->flags & SILC_PACKET_FLAG_BROADCAST)) {
1874     SILC_LOG_DEBUG(("Broadcasting received New Channel List packet"));
1875     silc_server_packet_send(server, server->router->connection,
1876                             packet->type,
1877                             packet->flags | SILC_PACKET_FLAG_BROADCAST,
1878                             packet->buffer->data, packet->buffer->len, FALSE);
1879   }
1880
1881   /* Make copy of the original packet context, except for the actual
1882      data buffer, which we will here now fetch from the original buffer. */
1883   new = silc_packet_context_alloc();
1884   new->type = SILC_PACKET_NEW_CHANNEL;
1885   new->flags = packet->flags;
1886   new->src_id = packet->src_id;
1887   new->src_id_len = packet->src_id_len;
1888   new->src_id_type = packet->src_id_type;
1889   new->dst_id = packet->dst_id;
1890   new->dst_id_len = packet->dst_id_len;
1891   new->dst_id_type = packet->dst_id_type;
1892
1893   buffer = silc_buffer_alloc(512);
1894   new->buffer = buffer;
1895
1896   while (packet->buffer->len) {
1897     SILC_GET16_MSB(len1, packet->buffer->data);
1898     if ((len1 > packet->buffer->len) ||
1899         (len1 > buffer->truelen))
1900       break;
1901
1902     SILC_GET16_MSB(len2, packet->buffer->data + 2 + len1);
1903     if ((len2 > packet->buffer->len) ||
1904         (len2 > buffer->truelen))
1905       break;
1906
1907     silc_buffer_pull_tail(buffer, 8 + len1 + len2);
1908     silc_buffer_put(buffer, packet->buffer->data, 8 + len1 + len2);
1909
1910     /* Process the New Channel */
1911     silc_server_new_channel(server, sock, new);
1912
1913     silc_buffer_push_tail(buffer, 8 + len1 + len2);
1914     silc_buffer_pull(packet->buffer, 8 + len1 + len2);
1915   }
1916
1917   silc_buffer_free(buffer);
1918   silc_free(new);
1919 }
1920
1921 /* Received key agreement packet. This packet is never for us. It is to
1922    the client in the packet's destination ID. Sending of this sort of packet
1923    equals sending private message, ie. it is sent point to point from
1924    one client to another. */
1925
1926 void silc_server_key_agreement(SilcServer server,
1927                                SilcSocketConnection sock,
1928                                SilcPacketContext *packet)
1929 {
1930   SilcSocketConnection dst_sock;
1931   SilcIDListData idata;
1932
1933   SILC_LOG_DEBUG(("Start"));
1934
1935   if (packet->src_id_type != SILC_ID_CLIENT ||
1936       packet->dst_id_type != SILC_ID_CLIENT)
1937     return;
1938
1939   if (!packet->dst_id)
1940     return;
1941
1942   /* Get the route to the client */
1943   dst_sock = silc_server_get_client_route(server, packet->dst_id,
1944                                           packet->dst_id_len, NULL, &idata);
1945   if (!dst_sock)
1946     return;
1947
1948   /* Relay the packet */
1949   silc_server_relay_packet(server, dst_sock, idata->send_key,
1950                            idata->hmac_send, packet, FALSE);
1951 }
1952
1953 /* Received connection auth request packet that is used during connection
1954    phase to resolve the mandatory authentication method.  This packet can
1955    actually be received at anytime but usually it is used only during
1956    the connection authentication phase. Now, protocol says that this packet
1957    can come from client or server, however, we support only this coming
1958    from client and expect that server's always knows what authentication
1959    method to use. */
1960
1961 void silc_server_connection_auth_request(SilcServer server,
1962                                          SilcSocketConnection sock,
1963                                          SilcPacketContext *packet)
1964 {
1965   SilcServerConfigSectionClientConnection *client = NULL;
1966   uint16 conn_type;
1967   int ret;
1968   SilcAuthMethod auth_meth;
1969
1970   SILC_LOG_DEBUG(("Start"));
1971
1972   if (packet->src_id_type && packet->src_id_type != SILC_ID_CLIENT)
1973     return;
1974
1975   /* Parse the payload */
1976   ret = silc_buffer_unformat(packet->buffer,
1977                              SILC_STR_UI_SHORT(&conn_type),
1978                              SILC_STR_UI_SHORT(NULL),
1979                              SILC_STR_END);
1980   if (ret == -1)
1981     return;
1982
1983   if (conn_type != SILC_SOCKET_TYPE_CLIENT)
1984     return;
1985
1986   /* Get the authentication method for the client */
1987   auth_meth = SILC_AUTH_NONE;
1988   client = silc_server_config_find_client_conn(server->config,
1989                                                sock->ip,
1990                                                sock->port);
1991   if (!client)
1992     client = silc_server_config_find_client_conn(server->config,
1993                                                  sock->hostname,
1994                                                  sock->port);
1995   if (client)
1996     auth_meth = client->auth_meth;
1997
1998   /* Send it back to the client */
1999   silc_server_send_connection_auth_request(server, sock,
2000                                            conn_type,
2001                                            auth_meth);
2002 }
2003
2004 /* Received REKEY packet. The sender of the packet wants to regenerate
2005    its session keys. This starts the REKEY protocol. */
2006
2007 void silc_server_rekey(SilcServer server,
2008                        SilcSocketConnection sock,
2009                        SilcPacketContext *packet)
2010 {
2011   SilcProtocol protocol;
2012   SilcServerRekeyInternalContext *proto_ctx;
2013   SilcIDListData idata = (SilcIDListData)sock->user_data;
2014
2015   SILC_LOG_DEBUG(("Start"));
2016
2017   /* Allocate internal protocol context. This is sent as context
2018      to the protocol. */
2019   proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
2020   proto_ctx->server = (void *)server;
2021   proto_ctx->sock = sock;
2022   proto_ctx->responder = TRUE;
2023   proto_ctx->pfs = idata->rekey->pfs;
2024
2025   /* Perform rekey protocol. Will call the final callback after the
2026      protocol is over. */
2027   silc_protocol_alloc(SILC_PROTOCOL_SERVER_REKEY,
2028                       &protocol, proto_ctx, silc_server_rekey_final);
2029   sock->protocol = protocol;
2030
2031   if (proto_ctx->pfs == FALSE)
2032     /* Run the protocol */
2033     protocol->execute(server->timeout_queue, 0, protocol, sock->sock, 0, 0);
2034 }