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   void *sender_entry = NULL;
1152
1153   SILC_LOG_DEBUG(("Processing channel message"));
1154
1155   /* Sanity checks */
1156   if (packet->dst_id_type != SILC_ID_CHANNEL) {
1157     SILC_LOG_DEBUG(("Received bad message for channel, dropped"));
1158     goto out;
1159   }
1160
1161   /* Find channel entry */
1162   id = silc_id_str2id(packet->dst_id, packet->dst_id_len, SILC_ID_CHANNEL);
1163   if (!id)
1164     goto out;
1165   channel = silc_idlist_find_channel_by_id(server->local_list, id, NULL);
1166   if (!channel) {
1167     channel = silc_idlist_find_channel_by_id(server->global_list, id, NULL);
1168     if (!channel) {
1169       SILC_LOG_DEBUG(("Could not find channel"));
1170       goto out;
1171     }
1172   }
1173
1174   /* See that this client is on the channel. If the message is coming
1175      from router we won't do the check as the message is from client that
1176      we don't know about. Also, if the original sender is not client
1177      (as it can be server as well) we don't do the check. */
1178   sender = silc_id_str2id(packet->src_id, packet->src_id_len,
1179                           packet->src_id_type);
1180   if (!sender)
1181     goto out;
1182   if (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         sender_entry = chl->client;
1187         break;
1188       }
1189     }
1190     if (chl == SILC_LIST_END) {
1191       SILC_LOG_DEBUG(("Client not on channel"));
1192       goto out;
1193     }
1194   }
1195
1196   /* Distribute the packet to our local clients. This will send the
1197      packet for further routing as well, if needed. */
1198   silc_server_packet_relay_to_channel(server, sock, channel, sender,
1199                                       packet->src_id_type, sender_entry,
1200                                       packet->buffer->data,
1201                                       packet->buffer->len, FALSE);
1202
1203  out:
1204   if (sender)
1205     silc_free(sender);
1206   if (id)
1207     silc_free(id);
1208 }
1209
1210 /* Received channel key packet. We distribute the key to all of our locally
1211    connected clients on the channel. */
1212
1213 void silc_server_channel_key(SilcServer server,
1214                              SilcSocketConnection sock,
1215                              SilcPacketContext *packet)
1216 {
1217   SilcBuffer buffer = packet->buffer;
1218   SilcChannelEntry channel;
1219
1220   if (packet->src_id_type != SILC_ID_SERVER ||
1221       (server->server_type == SILC_ROUTER &&
1222        sock->type == SILC_SOCKET_TYPE_ROUTER))
1223     return;
1224
1225   /* Save the channel key */
1226   channel = silc_server_save_channel_key(server, buffer, NULL);
1227   if (!channel)
1228     return;
1229
1230   /* Distribute the key to everybody who is on the channel. If we are router
1231      we will also send it to locally connected servers. */
1232   silc_server_send_channel_key(server, sock, channel, FALSE);
1233 }
1234
1235 /* Received New Client packet and processes it.  Creates Client ID for the
1236    client. Client becomes registered after calling this functions. */
1237
1238 SilcClientEntry silc_server_new_client(SilcServer server,
1239                                        SilcSocketConnection sock,
1240                                        SilcPacketContext *packet)
1241 {
1242   SilcBuffer buffer = packet->buffer;
1243   SilcClientEntry client;
1244   SilcIDCacheEntry cache;
1245   SilcClientID *client_id;
1246   SilcBuffer reply;
1247   SilcIDListData idata;
1248   char *username = NULL, *realname = NULL, *id_string;
1249   int ret;
1250
1251   SILC_LOG_DEBUG(("Creating new client"));
1252
1253   if (sock->type != SILC_SOCKET_TYPE_CLIENT)
1254     return NULL;
1255
1256   /* Take client entry */
1257   client = (SilcClientEntry)sock->user_data;
1258   idata = (SilcIDListData)client;
1259
1260   /* Fetch the old client cache entry so that we can update it. */
1261   if (!silc_idcache_find_by_context(server->local_list->clients,
1262                                     sock->user_data, &cache)) {
1263     SILC_LOG_ERROR(("Lost client's cache entry - bad thing"));
1264     silc_server_disconnect_remote(server, sock, "Server closed connection: "
1265                                   "Unknown client");
1266     return NULL;
1267   }
1268
1269   /* Parse incoming packet */
1270   ret = silc_buffer_unformat(buffer,
1271                              SILC_STR_UI16_STRING_ALLOC(&username),
1272                              SILC_STR_UI16_STRING_ALLOC(&realname),
1273                              SILC_STR_END);
1274   if (ret == -1) {
1275     if (username)
1276       silc_free(username);
1277     if (realname)
1278       silc_free(realname);
1279     silc_server_disconnect_remote(server, sock, "Server closed connection: "
1280                                   "Incomplete client information");
1281     return NULL;
1282   }
1283
1284   if (!username) {
1285     silc_free(username);
1286     if (realname)
1287       silc_free(realname);
1288     silc_server_disconnect_remote(server, sock, "Server closed connection: "
1289                                   "Incomplete client information");
1290     return NULL;
1291   }
1292
1293   /* Create Client ID */
1294   silc_id_create_client_id(server->id, server->rng, server->md5hash,
1295                            username, &client_id);
1296
1297   if (strlen(username) > 128)
1298     username[127] = '\0';
1299
1300   /* Update client entry */
1301   idata->registered = TRUE;
1302   client->nickname = strdup(username);
1303   client->username = username;
1304   client->userinfo = realname ? realname : strdup(" ");
1305   client->id = client_id;
1306
1307   /* Update the cache entry */
1308   cache->id = (void *)client_id;
1309   cache->type = SILC_ID_CLIENT;
1310   cache->data = username;
1311   cache->data_len = strlen(username);
1312   silc_idcache_sort_by_data(server->local_list->clients);
1313
1314   /* Notify our router about new client on the SILC network */
1315   if (!server->standalone)
1316     silc_server_send_new_id(server, (SilcSocketConnection)
1317                             server->router->connection,
1318                             server->server_type == SILC_ROUTER ? TRUE : FALSE,
1319                             client->id, SILC_ID_CLIENT, SILC_ID_CLIENT_LEN);
1320
1321   /* Send the new client ID to the client. */
1322   id_string = silc_id_id2str(client->id, SILC_ID_CLIENT);
1323   reply = silc_buffer_alloc(2 + 2 + SILC_ID_CLIENT_LEN);
1324   silc_buffer_pull_tail(reply, SILC_BUFFER_END(reply));
1325   silc_buffer_format(reply,
1326                      SILC_STR_UI_SHORT(SILC_ID_CLIENT),
1327                      SILC_STR_UI_SHORT(SILC_ID_CLIENT_LEN),
1328                      SILC_STR_UI_XNSTRING(id_string, SILC_ID_CLIENT_LEN),
1329                      SILC_STR_END);
1330   silc_server_packet_send(server, sock, SILC_PACKET_NEW_ID, 0,
1331                           reply->data, reply->len, FALSE);
1332   silc_free(id_string);
1333   silc_buffer_free(reply);
1334
1335   /* Send some nice info to the client */
1336   SILC_SERVER_SEND_NOTIFY(server, sock, SILC_NOTIFY_TYPE_NONE,
1337                           ("Welcome to the SILC Network %s@%s",
1338                            username, sock->hostname));
1339   SILC_SERVER_SEND_NOTIFY(server, sock, SILC_NOTIFY_TYPE_NONE,
1340                           ("Your host is %s, running version %s",
1341                            server->config->server_info->server_name,
1342                            server_version));
1343   if (server->server_type == SILC_ROUTER) {
1344     SILC_SERVER_SEND_NOTIFY(server, sock, SILC_NOTIFY_TYPE_NONE,
1345                             ("There are %d clients on %d servers in SILC "
1346                              "Network", server->stat.clients,
1347                              server->stat.servers + 1));
1348     SILC_SERVER_SEND_NOTIFY(server, sock, SILC_NOTIFY_TYPE_NONE,
1349                             ("There are %d clients on %d server in our cell",
1350                              server->stat.cell_clients,
1351                              server->stat.cell_servers + 1));
1352     SILC_SERVER_SEND_NOTIFY(server, sock, SILC_NOTIFY_TYPE_NONE,
1353                             ("I have %d clients, %d channels, %d servers and "
1354                              "%d routers",
1355                              server->stat.my_clients,
1356                              server->stat.my_channels,
1357                              server->stat.my_servers,
1358                              server->stat.my_routers));
1359     SILC_SERVER_SEND_NOTIFY(server, sock, SILC_NOTIFY_TYPE_NONE,
1360                             ("%d server operators and %d router operators "
1361                              "online",
1362                              server->stat.my_server_ops,
1363                              server->stat.my_router_ops));
1364   } else {
1365     SILC_SERVER_SEND_NOTIFY(server, sock, SILC_NOTIFY_TYPE_NONE,
1366                             ("I have %d clients and %d channels formed",
1367                              server->stat.my_clients,
1368                              server->stat.my_channels));
1369     SILC_SERVER_SEND_NOTIFY(server, sock, SILC_NOTIFY_TYPE_NONE,
1370                             ("%d operators online",
1371                              server->stat.my_server_ops));
1372   }
1373   SILC_SERVER_SEND_NOTIFY(server, sock, SILC_NOTIFY_TYPE_NONE,
1374                           ("Your connection is secured with %s cipher, "
1375                            "key length %d bits",
1376                            idata->send_key->cipher->name,
1377                            idata->send_key->cipher->key_len));
1378   SILC_SERVER_SEND_NOTIFY(server, sock, SILC_NOTIFY_TYPE_NONE,
1379                           ("Your current nickname is %s",
1380                            client->nickname));
1381
1382   /* Send motd */
1383   silc_server_send_motd(server, sock);
1384
1385   return client;
1386 }
1387
1388 /* Create new server. This processes received New Server packet and
1389    saves the received Server ID. The server is our locally connected
1390    server thus we save all the information and save it to local list.
1391    This funtion can be used by both normal server and router server.
1392    If normal server uses this it means that its router has connected
1393    to the server. If router uses this it means that one of the cell's
1394    servers is connected to the router. */
1395
1396 SilcServerEntry silc_server_new_server(SilcServer server,
1397                                        SilcSocketConnection sock,
1398                                        SilcPacketContext *packet)
1399 {
1400   SilcBuffer buffer = packet->buffer;
1401   SilcServerEntry new_server;
1402   SilcIDCacheEntry cache;
1403   SilcServerID *server_id;
1404   SilcIDListData idata;
1405   unsigned char *server_name, *id_string;
1406   uint16 id_len, name_len;
1407   int ret;
1408
1409   SILC_LOG_DEBUG(("Creating new server"));
1410
1411   if (sock->type != SILC_SOCKET_TYPE_SERVER &&
1412       sock->type != SILC_SOCKET_TYPE_ROUTER)
1413     return NULL;
1414
1415   /* Take server entry */
1416   new_server = (SilcServerEntry)sock->user_data;
1417   idata = (SilcIDListData)new_server;
1418
1419   /* Fetch the old server cache entry so that we can update it. */
1420   if (!silc_idcache_find_by_context(server->local_list->servers,
1421                                     sock->user_data, &cache)) {
1422     SILC_LOG_ERROR(("Lost server's cache entry - bad thing"));
1423     return NULL;
1424   }
1425
1426   /* Parse the incoming packet */
1427   ret = silc_buffer_unformat(buffer,
1428                              SILC_STR_UI16_NSTRING_ALLOC(&id_string, &id_len),
1429                              SILC_STR_UI16_NSTRING_ALLOC(&server_name,
1430                                                          &name_len),
1431                              SILC_STR_END);
1432   if (ret == -1) {
1433     if (id_string)
1434       silc_free(id_string);
1435     if (server_name)
1436       silc_free(server_name);
1437     return NULL;
1438   }
1439
1440   if (id_len > buffer->len) {
1441     silc_free(id_string);
1442     silc_free(server_name);
1443     return NULL;
1444   }
1445
1446   if (name_len > 256)
1447     server_name[255] = '\0';
1448
1449   /* Get Server ID */
1450   server_id = silc_id_str2id(id_string, id_len, SILC_ID_SERVER);
1451   if (!server_id) {
1452     silc_free(id_string);
1453     silc_free(server_name);
1454     return NULL;
1455   }
1456   silc_free(id_string);
1457
1458   /* Update client entry */
1459   idata->registered = TRUE;
1460   new_server->server_name = server_name;
1461   new_server->id = server_id;
1462
1463   /* Update the cache entry */
1464   cache->id = (void *)server_id;
1465   cache->type = SILC_ID_SERVER;
1466   cache->data = server_name;
1467   cache->data_len = strlen(server_name);
1468   silc_idcache_sort_by_data(server->local_list->servers);
1469
1470   /* Distribute the information about new server in the SILC network
1471      to our router. If we are normal server we won't send anything
1472      since this connection must be our router connection. */
1473   if (server->server_type == SILC_ROUTER && !server->standalone &&
1474       server->router->connection != sock)
1475     silc_server_send_new_id(server, server->router->connection,
1476                             TRUE, new_server->id, SILC_ID_SERVER,
1477                             SILC_ID_SERVER_LEN);
1478
1479   if (server->server_type == SILC_ROUTER)
1480     server->stat.cell_servers++;
1481
1482   return new_server;
1483 }
1484
1485 /* Processes incoming New ID packet. New ID Payload is used to distribute
1486    information about newly registered clients and servers. */
1487
1488 static void silc_server_new_id_real(SilcServer server,
1489                                     SilcSocketConnection sock,
1490                                     SilcPacketContext *packet,
1491                                     int broadcast)
1492 {
1493   SilcBuffer buffer = packet->buffer;
1494   SilcIDList id_list;
1495   SilcServerEntry router;
1496   SilcSocketConnection router_sock;
1497   SilcIDPayload idp;
1498   SilcIdType id_type;
1499   unsigned char *hash = NULL;
1500   void *id;
1501
1502   SILC_LOG_DEBUG(("Processing new ID"));
1503
1504   if (sock->type == SILC_SOCKET_TYPE_CLIENT ||
1505       server->server_type == SILC_SERVER ||
1506       packet->src_id_type != SILC_ID_SERVER)
1507     return;
1508
1509   idp = silc_id_payload_parse(buffer);
1510   if (!idp)
1511     return;
1512
1513   id_type = silc_id_payload_get_type(idp);
1514
1515   /* Normal server cannot have other normal server connections */
1516   if (id_type == SILC_ID_SERVER && sock->type == SILC_SOCKET_TYPE_SERVER)
1517     goto out;
1518
1519   id = silc_id_payload_get_id(idp);
1520   if (!id)
1521     goto out;
1522
1523   /* If the sender of this packet is server and we are router we need to
1524      broadcast this packet to other routers in the network. */
1525   if (broadcast && !server->standalone && server->server_type == SILC_ROUTER &&
1526       sock->type == SILC_SOCKET_TYPE_SERVER &&
1527       !(packet->flags & SILC_PACKET_FLAG_BROADCAST)) {
1528     SILC_LOG_DEBUG(("Broadcasting received New ID packet"));
1529     silc_server_packet_send(server, server->router->connection,
1530                             packet->type,
1531                             packet->flags | SILC_PACKET_FLAG_BROADCAST,
1532                             buffer->data, buffer->len, FALSE);
1533   }
1534
1535   if (sock->type == SILC_SOCKET_TYPE_SERVER)
1536     id_list = server->local_list;
1537   else
1538     id_list = server->global_list;
1539
1540   /* If the packet is coming from router then use the sender as the
1541      origin of the the packet. If it came from router then check the real
1542      sender of the packet and use that as he origin. */
1543   if (sock->type == SILC_SOCKET_TYPE_SERVER) {
1544     router_sock = sock;
1545     router = sock->user_data;
1546   } else {
1547     void *sender_id = silc_id_str2id(packet->src_id, packet->src_id_len,
1548                                      packet->src_id_type);
1549     router = silc_idlist_find_server_by_id(server->global_list,
1550                                            sender_id, NULL);
1551     if (!router)
1552       router = silc_idlist_find_server_by_id(server->local_list,
1553                                              sender_id, NULL);
1554     assert(router != NULL);
1555     router_sock = sock;
1556     silc_free(sender_id);
1557   }
1558
1559   switch(id_type) {
1560   case SILC_ID_CLIENT:
1561     {
1562       SilcClientEntry entry;
1563
1564       SILC_LOG_DEBUG(("New client id(%s) from [%s] %s",
1565                       silc_id_render(id, SILC_ID_CLIENT),
1566                       sock->type == SILC_SOCKET_TYPE_SERVER ?
1567                       "Server" : "Router", sock->hostname));
1568
1569       /* As a router we keep information of all global information in our
1570          global list. Cell wide information however is kept in the local
1571          list. The client is put to global list and we will take the hash
1572          value of the Client ID and save it to the ID Cache system for fast
1573          searching in the future. */
1574       hash = silc_calloc(sizeof(((SilcClientID *)id)->hash),
1575                          sizeof(unsigned char));
1576       memcpy(hash, ((SilcClientID *)id)->hash,
1577              sizeof(((SilcClientID *)id)->hash));
1578       entry = silc_idlist_add_client(id_list, hash,
1579                                      sizeof(((SilcClientID *)id)->hash),
1580                                      NULL, NULL, id, router, NULL);
1581       entry->nickname = NULL;
1582       entry->data.registered = TRUE;
1583
1584       if (sock->type == SILC_SOCKET_TYPE_SERVER)
1585         server->stat.cell_clients++;
1586       server->stat.clients++;
1587     }
1588     break;
1589
1590   case SILC_ID_SERVER:
1591     /* If the ID is mine, ignore it. */
1592     if (!SILC_ID_SERVER_COMPARE(id, server->id)) {
1593       SILC_LOG_DEBUG(("Ignoring my own ID as new ID"));
1594       break;
1595     }
1596
1597     SILC_LOG_DEBUG(("New server id(%s) from [%s] %s",
1598                     silc_id_render(id, SILC_ID_SERVER),
1599                     sock->type == SILC_SOCKET_TYPE_SERVER ?
1600                     "Server" : "Router", sock->hostname));
1601
1602     /* As a router we keep information of all global information in our global
1603        list. Cell wide information however is kept in the local list. */
1604     silc_idlist_add_server(id_list, NULL, 0, id, router, router_sock);
1605
1606     if (sock->type == SILC_SOCKET_TYPE_SERVER)
1607       server->stat.cell_servers++;
1608     server->stat.servers++;
1609     break;
1610
1611   case SILC_ID_CHANNEL:
1612     SILC_LOG_ERROR(("Channel cannot be registered with NEW_ID packet"));
1613     break;
1614
1615   default:
1616     break;
1617   }
1618
1619  out:
1620   silc_id_payload_free(idp);
1621 }
1622
1623
1624 /* Processes incoming New ID packet. New ID Payload is used to distribute
1625    information about newly registered clients and servers. */
1626
1627 void silc_server_new_id(SilcServer server, SilcSocketConnection sock,
1628                         SilcPacketContext *packet)
1629 {
1630   silc_server_new_id_real(server, sock, packet, TRUE);
1631 }
1632
1633 /* Receoved New Id List packet, list of New ID payloads inside one
1634    packet. Process the New ID payloads one by one. */
1635
1636 void silc_server_new_id_list(SilcServer server, SilcSocketConnection sock,
1637                              SilcPacketContext *packet)
1638 {
1639   SilcPacketContext *new_id;
1640   SilcBuffer idp;
1641   uint16 id_len;
1642
1643   SILC_LOG_DEBUG(("Processing New ID List"));
1644
1645   if (sock->type == SILC_SOCKET_TYPE_CLIENT ||
1646       packet->src_id_type != SILC_ID_SERVER)
1647     return;
1648
1649   /* If the sender of this packet is server and we are router we need to
1650      broadcast this packet to other routers in the network. Broadcast
1651      this list packet instead of multiple New ID packets. */
1652   if (!server->standalone && server->server_type == SILC_ROUTER &&
1653       sock->type == SILC_SOCKET_TYPE_SERVER &&
1654       !(packet->flags & SILC_PACKET_FLAG_BROADCAST)) {
1655     SILC_LOG_DEBUG(("Broadcasting received New ID List packet"));
1656     silc_server_packet_send(server, server->router->connection,
1657                             packet->type,
1658                             packet->flags | SILC_PACKET_FLAG_BROADCAST,
1659                             packet->buffer->data, packet->buffer->len, FALSE);
1660   }
1661
1662   /* Make copy of the original packet context, except for the actual
1663      data buffer, which we will here now fetch from the original buffer. */
1664   new_id = silc_packet_context_alloc();
1665   new_id->type = SILC_PACKET_NEW_ID;
1666   new_id->flags = packet->flags;
1667   new_id->src_id = packet->src_id;
1668   new_id->src_id_len = packet->src_id_len;
1669   new_id->src_id_type = packet->src_id_type;
1670   new_id->dst_id = packet->dst_id;
1671   new_id->dst_id_len = packet->dst_id_len;
1672   new_id->dst_id_type = packet->dst_id_type;
1673
1674   idp = silc_buffer_alloc(256);
1675   new_id->buffer = idp;
1676
1677   while (packet->buffer->len) {
1678     SILC_GET16_MSB(id_len, packet->buffer->data + 2);
1679     if ((id_len > packet->buffer->len) ||
1680         (id_len > idp->truelen))
1681       break;
1682
1683     silc_buffer_pull_tail(idp, 4 + id_len);
1684     silc_buffer_put(idp, packet->buffer->data, 4 + id_len);
1685
1686     /* Process the New ID */
1687     silc_server_new_id_real(server, sock, new_id, FALSE);
1688
1689     silc_buffer_push_tail(idp, 4 + id_len);
1690     silc_buffer_pull(packet->buffer, 4 + id_len);
1691   }
1692
1693   silc_buffer_free(idp);
1694   silc_free(new_id);
1695 }
1696
1697 /* Received New Channel packet. Information about new channels in the
1698    network are distributed using this packet. Save the information about
1699    the new channel. This usually comes from router but also normal server
1700    can send this to notify channels it has when it connects to us. */
1701
1702 void silc_server_new_channel(SilcServer server,
1703                              SilcSocketConnection sock,
1704                              SilcPacketContext *packet)
1705 {
1706   SilcChannelPayload payload;
1707   SilcChannelID *channel_id;
1708   char *channel_name;
1709   uint32 name_len;
1710   unsigned char *id;
1711   uint32 id_len;
1712   uint32 mode;
1713
1714   SILC_LOG_DEBUG(("Processing New Channel"));
1715
1716   if (sock->type == SILC_SOCKET_TYPE_CLIENT ||
1717       packet->src_id_type != SILC_ID_SERVER ||
1718       server->server_type == SILC_SERVER)
1719     return;
1720
1721   /* Parse the channel payload */
1722   payload = silc_channel_payload_parse(packet->buffer);
1723   if (!payload)
1724     return;
1725
1726   /* Get the channel ID */
1727   channel_id = silc_channel_get_id_parse(payload);
1728   if (!channel_id) {
1729     silc_channel_payload_free(payload);
1730     return;
1731   }
1732
1733   channel_name = silc_channel_get_name(payload, &name_len);
1734   if (name_len > 256)
1735     channel_name[255] = '\0';
1736
1737   id = silc_channel_get_id(payload, &id_len);
1738
1739   if (sock->type == SILC_SOCKET_TYPE_ROUTER) {
1740     /* Add the server to global list as it is coming from router. It
1741        cannot be our own channel as it is coming from router. */
1742
1743     SILC_LOG_DEBUG(("New channel id(%s) from [Router] %s",
1744                     silc_id_render(channel_id, SILC_ID_CHANNEL),
1745                     sock->hostname));
1746
1747     silc_idlist_add_channel(server->global_list, strdup(channel_name),
1748                             0, channel_id, server->router->connection,
1749                             NULL, NULL);
1750
1751     server->stat.channels++;
1752   } else {
1753     /* The channel is coming from our server, thus it is in our cell
1754        we will add it to our local list. */
1755     SilcChannelEntry channel;
1756     SilcBuffer chk;
1757
1758     SILC_LOG_DEBUG(("New channel id(%s) from [Server] %s",
1759                     silc_id_render(channel_id, SILC_ID_CHANNEL),
1760                     sock->hostname));
1761
1762     /* Check that we don't already have this channel */
1763     channel = silc_idlist_find_channel_by_name(server->local_list,
1764                                                channel_name, NULL);
1765     if (!channel)
1766       channel = silc_idlist_find_channel_by_name(server->global_list,
1767                                                  channel_name, NULL);
1768
1769     /* If the channel does not exist, then create it. We create the channel
1770        with the channel ID provided by the server. This creates a new
1771        key to the channel as well that we will send to the server. */
1772     if (!channel) {
1773       channel = silc_server_create_new_channel_with_id(server, NULL, NULL,
1774                                                        channel_name,
1775                                                        channel_id, FALSE);
1776       if (!channel) {
1777         silc_channel_payload_free(payload);
1778         silc_free(channel_id);
1779         return;
1780       }
1781
1782       /* Send the new channel key to the server */
1783       chk = silc_channel_key_payload_encode(id_len, id,
1784                                             strlen(channel->channel_key->
1785                                                    cipher->name),
1786                                             channel->channel_key->cipher->name,
1787                                             channel->key_len / 8,
1788                                             channel->key);
1789       silc_server_packet_send(server, sock, SILC_PACKET_CHANNEL_KEY, 0,
1790                               chk->data, chk->len, FALSE);
1791       silc_buffer_free(chk);
1792
1793     } else {
1794       /* The channel exist by that name, check whether the ID's match.
1795          If they don't then we'll force the server to use the ID we have.
1796          We also create a new key for the channel. */
1797       SilcBuffer users = NULL;
1798
1799       if (!channel->id)
1800         channel_id = silc_id_dup(channel_id, SILC_ID_CHANNEL);
1801
1802       if (SILC_ID_CHANNEL_COMPARE(channel_id, channel->id)) {
1803         /* They don't match, send CHANNEL_CHANGE notify to the server to
1804            force the ID change. */
1805         SILC_LOG_DEBUG(("Forcing the server to change Channel ID"));
1806         silc_server_send_notify_channel_change(server, sock, FALSE,
1807                                                channel_id,
1808                                                channel->id,
1809                                                SILC_ID_CHANNEL_LEN);
1810       }
1811
1812       /* If the mode is different from what we have then enforce the
1813          mode change. */
1814       mode = silc_channel_get_mode(payload);
1815       if (channel->mode != mode) {
1816         SILC_LOG_DEBUG(("Forcing the server to change channel mode"));
1817         silc_server_send_notify_cmode(server, sock, FALSE, channel,
1818                                       channel->mode, server->id,
1819                                       SILC_ID_SERVER, SILC_ID_SERVER_LEN,
1820                                       channel->cipher, channel->hmac_name);
1821       }
1822
1823       /* Create new key for the channel and send it to the server and
1824          everybody else possibly on the channel. */
1825
1826       if (!(channel->mode & SILC_CHANNEL_MODE_PRIVKEY)) {
1827         silc_server_create_channel_key(server, channel, 0);
1828
1829         /* Send to the channel */
1830         silc_server_send_channel_key(server, sock, channel, FALSE);
1831         id = silc_id_id2str(channel->id, SILC_ID_CHANNEL);
1832         id_len = SILC_ID_CHANNEL_LEN;
1833
1834         /* Send to the server */
1835         chk = silc_channel_key_payload_encode(id_len, id,
1836                                               strlen(channel->channel_key->
1837                                                      cipher->name),
1838                                               channel->channel_key->
1839                                               cipher->name,
1840                                               channel->key_len / 8,
1841                                               channel->key);
1842         silc_server_packet_send(server, sock, SILC_PACKET_CHANNEL_KEY, 0,
1843                                 chk->data, chk->len, FALSE);
1844         silc_buffer_free(chk);
1845         silc_free(id);
1846       }
1847
1848       silc_free(channel_id);
1849
1850       /* Since the channel is coming from server and we also know about it
1851          then send the JOIN notify to the server so that it see's our
1852          users on the channel "joining" the channel. */
1853       silc_server_announce_get_channel_users(server, channel, &users);
1854       if (users) {
1855         silc_buffer_push(users, users->data - users->head);
1856         silc_server_packet_send(server, sock,
1857                                 SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
1858                                 users->data, users->len, FALSE);
1859         silc_buffer_free(users);
1860       }
1861     }
1862   }
1863
1864   silc_channel_payload_free(payload);
1865 }
1866
1867 /* Received New Channel List packet, list of New Channel List payloads inside
1868    one packet. Process the New Channel payloads one by one. */
1869
1870 void silc_server_new_channel_list(SilcServer server,
1871                                   SilcSocketConnection sock,
1872                                   SilcPacketContext *packet)
1873 {
1874   SilcPacketContext *new;
1875   SilcBuffer buffer;
1876   uint16 len1, len2;
1877
1878   SILC_LOG_DEBUG(("Processing New Channel List"));
1879
1880   if (sock->type == SILC_SOCKET_TYPE_CLIENT ||
1881       packet->src_id_type != SILC_ID_SERVER ||
1882       server->server_type == SILC_SERVER)
1883     return;
1884
1885   /* If the sender of this packet is server and we are router we need to
1886      broadcast this packet to other routers in the network. Broadcast
1887      this list packet instead of multiple New Channel packets. */
1888   if (!server->standalone && server->server_type == SILC_ROUTER &&
1889       sock->type == SILC_SOCKET_TYPE_SERVER &&
1890       !(packet->flags & SILC_PACKET_FLAG_BROADCAST)) {
1891     SILC_LOG_DEBUG(("Broadcasting received New Channel List packet"));
1892     silc_server_packet_send(server, server->router->connection,
1893                             packet->type,
1894                             packet->flags | SILC_PACKET_FLAG_BROADCAST,
1895                             packet->buffer->data, packet->buffer->len, FALSE);
1896   }
1897
1898   /* Make copy of the original packet context, except for the actual
1899      data buffer, which we will here now fetch from the original buffer. */
1900   new = silc_packet_context_alloc();
1901   new->type = SILC_PACKET_NEW_CHANNEL;
1902   new->flags = packet->flags;
1903   new->src_id = packet->src_id;
1904   new->src_id_len = packet->src_id_len;
1905   new->src_id_type = packet->src_id_type;
1906   new->dst_id = packet->dst_id;
1907   new->dst_id_len = packet->dst_id_len;
1908   new->dst_id_type = packet->dst_id_type;
1909
1910   buffer = silc_buffer_alloc(512);
1911   new->buffer = buffer;
1912
1913   while (packet->buffer->len) {
1914     SILC_GET16_MSB(len1, packet->buffer->data);
1915     if ((len1 > packet->buffer->len) ||
1916         (len1 > buffer->truelen))
1917       break;
1918
1919     SILC_GET16_MSB(len2, packet->buffer->data + 2 + len1);
1920     if ((len2 > packet->buffer->len) ||
1921         (len2 > buffer->truelen))
1922       break;
1923
1924     silc_buffer_pull_tail(buffer, 8 + len1 + len2);
1925     silc_buffer_put(buffer, packet->buffer->data, 8 + len1 + len2);
1926
1927     /* Process the New Channel */
1928     silc_server_new_channel(server, sock, new);
1929
1930     silc_buffer_push_tail(buffer, 8 + len1 + len2);
1931     silc_buffer_pull(packet->buffer, 8 + len1 + len2);
1932   }
1933
1934   silc_buffer_free(buffer);
1935   silc_free(new);
1936 }
1937
1938 /* Received key agreement packet. This packet is never for us. It is to
1939    the client in the packet's destination ID. Sending of this sort of packet
1940    equals sending private message, ie. it is sent point to point from
1941    one client to another. */
1942
1943 void silc_server_key_agreement(SilcServer server,
1944                                SilcSocketConnection sock,
1945                                SilcPacketContext *packet)
1946 {
1947   SilcSocketConnection dst_sock;
1948   SilcIDListData idata;
1949
1950   SILC_LOG_DEBUG(("Start"));
1951
1952   if (packet->src_id_type != SILC_ID_CLIENT ||
1953       packet->dst_id_type != SILC_ID_CLIENT)
1954     return;
1955
1956   if (!packet->dst_id)
1957     return;
1958
1959   /* Get the route to the client */
1960   dst_sock = silc_server_get_client_route(server, packet->dst_id,
1961                                           packet->dst_id_len, NULL, &idata);
1962   if (!dst_sock)
1963     return;
1964
1965   /* Relay the packet */
1966   silc_server_relay_packet(server, dst_sock, idata->send_key,
1967                            idata->hmac_send, packet, FALSE);
1968 }
1969
1970 /* Received connection auth request packet that is used during connection
1971    phase to resolve the mandatory authentication method.  This packet can
1972    actually be received at anytime but usually it is used only during
1973    the connection authentication phase. Now, protocol says that this packet
1974    can come from client or server, however, we support only this coming
1975    from client and expect that server's always knows what authentication
1976    method to use. */
1977
1978 void silc_server_connection_auth_request(SilcServer server,
1979                                          SilcSocketConnection sock,
1980                                          SilcPacketContext *packet)
1981 {
1982   SilcServerConfigSectionClientConnection *client = NULL;
1983   uint16 conn_type;
1984   int ret;
1985   SilcAuthMethod auth_meth;
1986
1987   SILC_LOG_DEBUG(("Start"));
1988
1989   if (packet->src_id_type && packet->src_id_type != SILC_ID_CLIENT)
1990     return;
1991
1992   /* Parse the payload */
1993   ret = silc_buffer_unformat(packet->buffer,
1994                              SILC_STR_UI_SHORT(&conn_type),
1995                              SILC_STR_UI_SHORT(NULL),
1996                              SILC_STR_END);
1997   if (ret == -1)
1998     return;
1999
2000   if (conn_type != SILC_SOCKET_TYPE_CLIENT)
2001     return;
2002
2003   /* Get the authentication method for the client */
2004   auth_meth = SILC_AUTH_NONE;
2005   client = silc_server_config_find_client_conn(server->config,
2006                                                sock->ip,
2007                                                sock->port);
2008   if (!client)
2009     client = silc_server_config_find_client_conn(server->config,
2010                                                  sock->hostname,
2011                                                  sock->port);
2012   if (client)
2013     auth_meth = client->auth_meth;
2014
2015   /* Send it back to the client */
2016   silc_server_send_connection_auth_request(server, sock,
2017                                            conn_type,
2018                                            auth_meth);
2019 }
2020
2021 /* Received REKEY packet. The sender of the packet wants to regenerate
2022    its session keys. This starts the REKEY protocol. */
2023
2024 void silc_server_rekey(SilcServer server,
2025                        SilcSocketConnection sock,
2026                        SilcPacketContext *packet)
2027 {
2028   SilcProtocol protocol;
2029   SilcServerRekeyInternalContext *proto_ctx;
2030   SilcIDListData idata = (SilcIDListData)sock->user_data;
2031
2032   SILC_LOG_DEBUG(("Start"));
2033
2034   /* Allocate internal protocol context. This is sent as context
2035      to the protocol. */
2036   proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
2037   proto_ctx->server = (void *)server;
2038   proto_ctx->sock = sock;
2039   proto_ctx->responder = TRUE;
2040   proto_ctx->pfs = idata->rekey->pfs;
2041
2042   /* Perform rekey protocol. Will call the final callback after the
2043      protocol is over. */
2044   silc_protocol_alloc(SILC_PROTOCOL_SERVER_REKEY,
2045                       &protocol, proto_ctx, silc_server_rekey_final);
2046   sock->protocol = protocol;
2047
2048   if (proto_ctx->pfs == FALSE)
2049     /* Run the protocol */
2050     protocol->execute(server->timeout_queue, 0, protocol, sock->sock, 0, 0);
2051 }