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       SilcChannelClientEntry chl2 = NULL;
 518
 519       /* If the mode is channel founder and we already find a client
 520          to have that mode on the channel we will enforce the sender
 521          to change the channel founder mode away. There can be only one
 522          channel founder on the channel. */
 523       if (server->server_type == SILC_ROUTER &&
 524           mode & SILC_CHANNEL_UMODE_CHANFO &&
 525           chl->mode & SILC_CHANNEL_UMODE_CHANFO) {
 526         silc_server_send_notify_cumode(server, sock, FALSE, channel,
 527                                        (mode & (~SILC_CHANNEL_UMODE_CHANFO)),
 528                                        server->id, SILC_ID_SERVER,
 529                                        client->id);
 530         silc_free(channel_id);
 531
 532         /* Change the mode back if we changed it */
 533         if (chl2)
 534           chl2->mode &= ~SILC_CHANNEL_UMODE_CHANFO;
 535         goto out;
 536       }
 537
 538       if (chl->client == client) {
 539         /* Change the mode */
 540         chl->mode = mode;
 541         if (!(mode & SILC_CHANNEL_UMODE_CHANFO))
 542           break;
 543
 544         chl2 = chl;
 545       }
 546     }
 547
 548     /* Send the same notify to the channel */
 549     silc_server_packet_send_to_channel(server, sock, channel, packet->type,
 550                                        FALSE, packet->buffer->data,
 551                                        packet->buffer->len, FALSE);
 552     silc_free(channel_id);
 553     break;
 554
 555   case SILC_NOTIFY_TYPE_INVITE:
 556
 557     if (packet->dst_id_type == SILC_ID_CLIENT)
 558       goto out;
 559
 560     SILC_LOG_DEBUG(("INVITE notify"));
 561
 562     /* Get Channel ID */
 563     tmp = silc_argument_get_arg_type(args, 1, &tmp_len);
 564     if (!tmp)
 565       goto out;
 566     channel_id = silc_id_payload_parse_id(tmp, tmp_len);
 567     if (!channel_id)
 568       goto out;
 569
 570     /* Get channel entry */
 571     channel = silc_idlist_find_channel_by_id(server->global_list,
 572                                              channel_id, NULL);
 573     if (!channel) {
 574       channel = silc_idlist_find_channel_by_id(server->local_list,
 575                                                channel_id, NULL);
 576       if (!channel) {
 577         silc_free(channel_id);
 578         goto out;
 579       }
 580     }
 581     silc_free(channel_id);
 582
 583     /* Get the added invite */
 584     tmp = silc_argument_get_arg_type(args, 3, &tmp_len);
 585     if (tmp) {
 586       if (!channel->invite_list)
 587         channel->invite_list = silc_calloc(tmp_len + 2,
 588                                            sizeof(*channel->invite_list));
 589       else
 590         channel->invite_list = silc_realloc(channel->invite_list,
 591                                             sizeof(*channel->invite_list) *
 592                                             (tmp_len +
 593                                              strlen(channel->invite_list) +
 594                                              2));
 595       if (tmp[tmp_len - 1] == ',')
 596         tmp[tmp_len - 1] = '\0';
 597
 598       strncat(channel->invite_list, tmp, tmp_len);
 599       strncat(channel->invite_list, ",", 1);
 600     }
 601
 602     /* Get the deleted invite */
 603     tmp = silc_argument_get_arg_type(args, 4, &tmp_len);
 604     if (tmp && channel->invite_list) {
 605       char *start, *end, *n;
 606
 607       if (!strncmp(channel->invite_list, tmp,
 608                    strlen(channel->invite_list) - 1)) {
 609         silc_free(channel->invite_list);
 610         channel->invite_list = NULL;
 611       } else {
 612         start = strstr(channel->invite_list, tmp);
 613         if (start && strlen(start) >= tmp_len) {
 614           end = start + tmp_len;
 615           n = silc_calloc(strlen(channel->invite_list) - tmp_len, sizeof(*n));
 616           strncat(n, channel->invite_list, start - channel->invite_list);
 617           strncat(n, end + 1, ((channel->invite_list +
 618                                 strlen(channel->invite_list)) - end) - 1);
 619           silc_free(channel->invite_list);
 620           channel->invite_list = n;
 621         }
 622       }
 623     }
 624
 625     break;
 626
 627   case SILC_NOTIFY_TYPE_CHANNEL_CHANGE:
 628     /*
 629      * Distribute to the local clients on the channel and change the
 630      * channel ID.
 631      */
 632
 633     SILC_LOG_DEBUG(("CHANNEL CHANGE"));
 634
 635     if (sock->type != SILC_SOCKET_TYPE_ROUTER)
 636       break;
 637
 638     /* Get the old Channel ID */
 639     tmp = silc_argument_get_arg_type(args, 1, &tmp_len);
 640     if (!tmp)
 641       goto out;
 642     channel_id = silc_id_payload_parse_id(tmp, tmp_len);
 643     if (!channel_id)
 644       goto out;
 645
 646     /* Get the channel entry */
 647     channel = silc_idlist_find_channel_by_id(server->global_list,
 648                                              channel_id, NULL);
 649     if (!channel) {
 650       channel = silc_idlist_find_channel_by_id(server->local_list,
 651                                                channel_id, NULL);
 652       if (!channel) {
 653         silc_free(channel_id);
 654         goto out;
 655       }
 656     }
 657
 658     /* Send the notify to the channel */
 659     silc_server_packet_send_to_channel(server, sock, channel, packet->type,
 660                                        FALSE, packet->buffer->data,
 661                                        packet->buffer->len, FALSE);
 662
 663     /* Get the new Channel ID */
 664     tmp = silc_argument_get_arg_type(args, 2, &tmp_len);
 665     if (!tmp)
 666       goto out;
 667     channel_id2 = silc_id_payload_parse_id(tmp, tmp_len);
 668     if (!channel_id2)
 669       goto out;
 670
 671     SILC_LOG_DEBUG(("Old Channel ID id(%s)",
 672                     silc_id_render(channel_id, SILC_ID_CHANNEL)));
 673     SILC_LOG_DEBUG(("New Channel ID id(%s)",
 674                     silc_id_render(channel_id2, SILC_ID_CHANNEL)));
 675
 676     /* Replace the Channel ID */
 677     if (!silc_idlist_replace_channel_id(server->global_list, channel_id,
 678                                         channel_id2))
 679       if (!silc_idlist_replace_channel_id(server->local_list, channel_id,
 680                                           channel_id2)) {
 681         silc_free(channel_id2);
 682         channel_id2 = NULL;
 683       }
 684
 685     if (channel_id2) {
 686       SilcBuffer users = NULL, users_modes = NULL;
 687
 688       /* Re-announce our clients on the channel as the ID has changed now */
 689       silc_server_announce_get_channel_users(server, channel, &users,
 690                                              &users_modes);
 691       if (users) {
 692         silc_buffer_push(users, users->data - users->head);
 693         silc_server_packet_send(server, sock,
 694                                 SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
 695                                 users->data, users->len, FALSE);
 696         silc_buffer_free(users);
 697       }
 698       if (users_modes) {
 699         silc_buffer_push(users_modes, users_modes->data - users_modes->head);
 700         silc_server_packet_send(server, sock,
 701                                 SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
 702                                 users_modes->data, users_modes->len, FALSE);
 703         silc_buffer_free(users_modes);
 704       }
 705     }
 706
 707     silc_free(channel_id);
 708
 709     break;
 710
 711   case SILC_NOTIFY_TYPE_SERVER_SIGNOFF:
 712     /*
 713      * Remove the server entry and all clients that this server owns.
 714      */
 715
 716     SILC_LOG_DEBUG(("SERVER SIGNOFF notify"));
 717
 718     /* Get Server ID */
 719     tmp = silc_argument_get_arg_type(args, 1, &tmp_len);
 720     if (!tmp)
 721       goto out;
 722     server_id = silc_id_payload_parse_id(tmp, tmp_len);
 723     if (!server_id)
 724       goto out;
 725
 726     /* Get server entry */
 727     server_entry = silc_idlist_find_server_by_id(server->global_list,
 728                                                  server_id, NULL);
 729     if (!server_entry) {
 730       server_entry = silc_idlist_find_server_by_id(server->local_list,
 731                                                    server_id, NULL);
 732       if (!server_entry) {
 733         silc_free(server_id);
 734         goto out;
 735       }
 736     }
 737     silc_free(server_id);
 738
 739     /* Free all client entries that this server owns as they will
 740        become invalid now as well. */
 741     silc_server_remove_clients_by_server(server, server_entry, TRUE);
 742
 743     /* Remove the server entry */
 744     if (!silc_idlist_del_server(server->global_list, server_entry))
 745       silc_idlist_del_server(server->local_list, server_entry);
 746
 747     /* XXX update statistics */
 748
 749     break;
 750
 751   case SILC_NOTIFY_TYPE_KICKED:
 752     /*
 753      * Distribute the notify to local clients on the channel
 754      */
 755
 756     SILC_LOG_DEBUG(("KICKED notify"));
 757
 758     channel_id = silc_id_str2id(packet->dst_id, packet->dst_id_len,
 759                                 packet->dst_id_type);
 760     if (!channel_id)
 761       goto out;
 762
 763     /* Get channel entry */
 764     channel = silc_idlist_find_channel_by_id(server->global_list,
 765                                              channel_id, NULL);
 766     if (!channel) {
 767       channel = silc_idlist_find_channel_by_id(server->local_list,
 768                                                channel_id, NULL);
 769       if (!channel) {
 770         silc_free(channel_id);
 771         goto out;
 772       }
 773     }
 774     silc_free(channel_id);
 775
 776     /* Get client ID */
 777     tmp = silc_argument_get_arg_type(args, 1, &tmp_len);
 778     if (!tmp)
 779       goto out;
 780     client_id = silc_id_payload_parse_id(tmp, tmp_len);
 781     if (!client_id)
 782       goto out;
 783
 784     /* Send to channel */
 785     silc_server_packet_send_to_channel(server, sock, channel, packet->type,
 786                                        FALSE, packet->buffer->data,
 787                                        packet->buffer->len, FALSE);
 788
 789     /* If the the client is not in local list we check global list */
 790     client = silc_idlist_find_client_by_id(server->global_list,
 791                                            client_id, NULL);
 792     if (!client) {
 793       client = silc_idlist_find_client_by_id(server->local_list,
 794                                              client_id, NULL);
 795       if (!client) {
 796         silc_free(client_id);
 797         goto out;
 798       }
 799     }
 800
 801     /* Remove the client from channel */
 802     silc_server_remove_from_one_channel(server, sock, channel, client, FALSE);
 803
 804     break;
 805
 806   case SILC_NOTIFY_TYPE_KILLED:
 807     {
 808       /*
 809        * Distribute the notify to local clients on channels
 810        */
 811       unsigned char *id;
 812       uint32 id_len;
 813
 814       SILC_LOG_DEBUG(("KILLED notify"));
 815
 816       /* Get client ID */
 817       id = silc_argument_get_arg_type(args, 1, &id_len);
 818       if (!id)
 819         goto out;
 820       client_id = silc_id_payload_parse_id(id, id_len);
 821       if (!client_id)
 822         goto out;
 823
 824       /* If the the client is not in local list we check global list */
 825       client = silc_idlist_find_client_by_id(server->global_list,
 826                                              client_id, NULL);
 827       if (!client) {
 828         client = silc_idlist_find_client_by_id(server->local_list,
 829                                                client_id, NULL);
 830         if (!client) {
 831           silc_free(client_id);
 832           goto out;
 833         }
 834       }
 835       silc_free(client_id);
 836
 837       /* If the client is one of ours, then close the connection to the
 838          client now. This removes the client from all channels as well. */
 839       if (packet->dst_id_type == SILC_ID_CLIENT && client->data.registered &&
 840           client->connection) {
 841         sock = client->connection;
 842         silc_server_free_client_data(server, NULL, client, FALSE, NULL);
 843         silc_server_close_connection(server, sock);
 844         break;
 845       }
 846
 847       /* Get comment */
 848       tmp = silc_argument_get_arg_type(args, 2, &tmp_len);
 849       if (tmp_len > 128)
 850         tmp = NULL;
 851
 852       /* Send the notify to local clients on the channels except to the
 853          client who is killed. */
 854       silc_server_send_notify_on_channels(server, client, client,
 855                                           SILC_NOTIFY_TYPE_KILLED,
 856                                           tmp ? 2 : 1,
 857                                           id, id_len,
 858                                           tmp, tmp_len);
 859
 860       /* Remove the client from all channels */
 861       silc_server_remove_from_channels(server, NULL, client, FALSE, NULL,
 862                                        FALSE);
 863
 864       break;
 865     }
 866
 867   case SILC_NOTIFY_TYPE_UMODE_CHANGE:
 868     /*
 869      * Save the mode of the client.
 870      */
 871
 872     SILC_LOG_DEBUG(("UMODE_CHANGE notify"));
 873
 874     /* Get client ID */
 875     tmp = silc_argument_get_arg_type(args, 1, &tmp_len);
 876     if (!tmp)
 877       goto out;
 878     client_id = silc_id_payload_parse_id(tmp, tmp_len);
 879     if (!client_id)
 880       goto out;
 881
 882     /* Get client entry */
 883     client = silc_idlist_find_client_by_id(server->global_list,
 884                                            client_id, NULL);
 885     if (!client) {
 886       client = silc_idlist_find_client_by_id(server->local_list,
 887                                              client_id, NULL);
 888       if (!client) {
 889         silc_free(client_id);
 890         goto out;
 891       }
 892     }
 893     silc_free(client_id);
 894
 895     /* Get the mode */
 896     tmp = silc_argument_get_arg_type(args, 2, &tmp_len);
 897     if (!tmp)
 898       goto out;
 899
 900     /* Save the mode */
 901     SILC_GET32_MSB(client->mode, tmp);
 902
 903     break;
 904
 905   case SILC_NOTIFY_TYPE_BAN:
 906     /*
 907      * Save the ban
 908      */
 909
 910     SILC_LOG_DEBUG(("BAN notify"));
 911
 912     /* Get Channel ID */
 913     tmp = silc_argument_get_arg_type(args, 1, &tmp_len);
 914     if (!tmp)
 915       goto out;
 916     channel_id = silc_id_payload_parse_id(tmp, tmp_len);
 917     if (!channel_id)
 918       goto out;
 919
 920     /* Get channel entry */
 921     channel = silc_idlist_find_channel_by_id(server->global_list,
 922                                              channel_id, NULL);
 923     if (!channel) {
 924       channel = silc_idlist_find_channel_by_id(server->local_list,
 925                                                channel_id, NULL);
 926       if (!channel) {
 927         silc_free(channel_id);
 928         goto out;
 929       }
 930     }
 931     silc_free(channel_id);
 932
 933     /* Get the new ban and add it to the ban list */
 934     tmp = silc_argument_get_arg_type(args, 2, &tmp_len);
 935     if (tmp) {
 936       if (!channel->ban_list)
 937         channel->ban_list = silc_calloc(tmp_len + 2,
 938                                         sizeof(*channel->ban_list));
 939       else
 940         channel->ban_list = silc_realloc(channel->ban_list,
 941                                          sizeof(*channel->ban_list) *
 942                                          (tmp_len +
 943                                           strlen(channel->ban_list) + 2));
 944       strncat(channel->ban_list, tmp, tmp_len);
 945       strncat(channel->ban_list, ",", 1);
 946     }
 947
 948     /* Get the ban to be removed and remove it from the list */
 949     tmp = silc_argument_get_arg_type(args, 3, &tmp_len);
 950     if (tmp && channel->ban_list) {
 951       char *start, *end, *n;
 952
 953       if (!strcmp(channel->ban_list, tmp)) {
 954         silc_free(channel->ban_list);
 955         channel->ban_list = NULL;
 956       } else {
 957         start = strstr(channel->ban_list, tmp);
 958         if (start && strlen(start) >= tmp_len) {
 959           end = start + tmp_len;
 960           n = silc_calloc(strlen(channel->ban_list) - tmp_len, sizeof(*n));
 961           strncat(n, channel->ban_list, start - channel->ban_list);
 962           strncat(n, end + 1, ((channel->ban_list +
 963                                 strlen(channel->ban_list)) - end) - 1);
 964           silc_free(channel->ban_list);
 965           channel->ban_list = n;
 966         }
 967       }
 968     }
 969
 970     break;
 971
 972     /* Ignore rest of the notify types for now */
 973   case SILC_NOTIFY_TYPE_NONE:
 974   case SILC_NOTIFY_TYPE_MOTD:
 975     break;
 976   default:
 977     break;
 978   }
 979
 980  out:
 981   silc_notify_payload_free(payload);
 982 }
 983
 984 void silc_server_notify_list(SilcServer server,
 985                              SilcSocketConnection sock,
 986                              SilcPacketContext *packet)
 987 {
 988   SilcPacketContext *new;
 989   SilcBuffer buffer;
 990   uint16 len;
 991
 992   SILC_LOG_DEBUG(("Processing Notify List"));
 993
 994   if (sock->type == SILC_SOCKET_TYPE_CLIENT ||
 995       packet->src_id_type != SILC_ID_SERVER)
 996     return;
 997
 998   /* Make copy of the original packet context, except for the actual
 999      data buffer, which we will here now fetch from the original buffer. */
1000   new = silc_packet_context_alloc();
1001   new->type = SILC_PACKET_NOTIFY;
1002   new->flags = packet->flags;
1003   new->src_id = packet->src_id;
1004   new->src_id_len = packet->src_id_len;
1005   new->src_id_type = packet->src_id_type;
1006   new->dst_id = packet->dst_id;
1007   new->dst_id_len = packet->dst_id_len;
1008   new->dst_id_type = packet->dst_id_type;
1009
1010   buffer = silc_buffer_alloc(1024);
1011   new->buffer = buffer;
1012
1013   while (packet->buffer->len) {
1014     SILC_GET16_MSB(len, packet->buffer->data + 2);
1015     if (len > packet->buffer->len)
1016       break;
1017
1018     if (len > buffer->truelen) {
1019       silc_buffer_free(buffer);
1020       buffer = silc_buffer_alloc(1024 + len);
1021     }
1022
1023     silc_buffer_pull_tail(buffer, len);
1024     silc_buffer_put(buffer, packet->buffer->data, len);
1025
1026     /* Process the Notify */
1027     silc_server_notify(server, sock, new);
1028
1029     silc_buffer_push_tail(buffer, len);
1030     silc_buffer_pull(packet->buffer, len);
1031   }
1032
1033   silc_buffer_free(buffer);
1034   silc_free(new);
1035 }
1036
1037 /* Received private message. This resolves the destination of the message
1038    and sends the packet. This is used by both server and router.  If the
1039    destination is our locally connected client this sends the packet to
1040    the client. This may also send the message for further routing if
1041    the destination is not in our server (or router). */
1042
1043 void silc_server_private_message(SilcServer server,
1044                                  SilcSocketConnection sock,
1045                                  SilcPacketContext *packet)
1046 {
1047   SilcSocketConnection dst_sock;
1048   SilcIDListData idata;
1049
1050   SILC_LOG_DEBUG(("Start"));
1051
1052   if (packet->src_id_type != SILC_ID_CLIENT ||
1053       packet->dst_id_type != SILC_ID_CLIENT)
1054     return;
1055
1056   if (!packet->dst_id)
1057     return;
1058
1059   /* Get the route to the client */
1060   dst_sock = silc_server_get_client_route(server, packet->dst_id,
1061                                           packet->dst_id_len, NULL, &idata);
1062   if (!dst_sock)
1063     return;
1064
1065   /* Send the private message */
1066   silc_server_send_private_message(server, dst_sock, idata->send_key,
1067                                    idata->hmac_send, packet);
1068 }
1069
1070 /* Received private message key packet.. This packet is never for us. It is to
1071    the client in the packet's destination ID. Sending of this sort of packet
1072    equals sending private message, ie. it is sent point to point from
1073    one client to another. */
1074
1075 void silc_server_private_message_key(SilcServer server,
1076                                      SilcSocketConnection sock,
1077                                      SilcPacketContext *packet)
1078 {
1079   SilcSocketConnection dst_sock;
1080   SilcIDListData idata;
1081
1082   SILC_LOG_DEBUG(("Start"));
1083
1084   if (packet->src_id_type != SILC_ID_CLIENT ||
1085       packet->dst_id_type != SILC_ID_CLIENT)
1086     return;
1087
1088   if (!packet->dst_id)
1089     return;
1090
1091   /* Get the route to the client */
1092   dst_sock = silc_server_get_client_route(server, packet->dst_id,
1093                                           packet->dst_id_len, NULL, &idata);
1094   if (!dst_sock)
1095     return;
1096
1097   /* Relay the packet */
1098   silc_server_relay_packet(server, dst_sock, idata->send_key,
1099                            idata->hmac_send, packet, FALSE);
1100 }
1101
1102 /* Processes incoming command reply packet. The command reply packet may
1103    be destined to one of our clients or it may directly for us. We will
1104    call the command reply routine after processing the packet. */
1105
1106 void silc_server_command_reply(SilcServer server,
1107                                SilcSocketConnection sock,
1108                                SilcPacketContext *packet)
1109 {
1110   SilcBuffer buffer = packet->buffer;
1111   SilcClientEntry client = NULL;
1112   SilcSocketConnection dst_sock;
1113   SilcIDListData idata;
1114   SilcClientID *id = NULL;
1115
1116   SILC_LOG_DEBUG(("Start"));
1117
1118   /* Source must be server or router */
1119   if (packet->src_id_type != SILC_ID_SERVER &&
1120       sock->type != SILC_SOCKET_TYPE_ROUTER)
1121     return;
1122
1123   if (packet->dst_id_type == SILC_ID_CHANNEL)
1124     return;
1125
1126   if (packet->dst_id_type == SILC_ID_CLIENT) {
1127     /* Destination must be one of ours */
1128     id = silc_id_str2id(packet->dst_id, packet->dst_id_len, SILC_ID_CLIENT);
1129     if (!id)
1130       return;
1131     client = silc_idlist_find_client_by_id(server->local_list, id, NULL);
1132     if (!client) {
1133       SILC_LOG_ERROR(("Cannot process command reply to unknown client"));
1134       silc_free(id);
1135       return;
1136     }
1137   }
1138
1139   if (packet->dst_id_type == SILC_ID_SERVER) {
1140     /* For now this must be for us */
1141     if (memcmp(packet->dst_id, server->id_string, packet->dst_id_len)) {
1142       SILC_LOG_ERROR(("Cannot process command reply to unknown server"));
1143       return;
1144     }
1145   }
1146
1147   /* Execute command reply locally for the command */
1148   silc_server_command_reply_process(server, sock, buffer);
1149
1150   if (packet->dst_id_type == SILC_ID_CLIENT && client && id) {
1151     /* Relay the packet to the client */
1152
1153     dst_sock = (SilcSocketConnection)client->connection;
1154     silc_buffer_push(buffer, SILC_PACKET_HEADER_LEN + packet->src_id_len
1155                      + packet->dst_id_len + packet->padlen);
1156
1157     silc_packet_send_prepare(dst_sock, 0, 0, buffer->len);
1158     silc_buffer_put(dst_sock->outbuf, buffer->data, buffer->len);
1159
1160     idata = (SilcIDListData)client;
1161
1162     /* Encrypt packet */
1163     silc_packet_encrypt(idata->send_key, idata->hmac_send, dst_sock->outbuf,
1164                         buffer->len);
1165
1166     /* Send the packet */
1167     silc_server_packet_send_real(server, dst_sock, TRUE);
1168
1169     silc_free(id);
1170   }
1171 }
1172
1173 /* Process received channel message. The message can be originated from
1174    client or server. */
1175
1176 void silc_server_channel_message(SilcServer server,
1177                                  SilcSocketConnection sock,
1178                                  SilcPacketContext *packet)
1179 {
1180   SilcChannelEntry channel = NULL;
1181   SilcChannelClientEntry chl;
1182   SilcChannelID *id = NULL;
1183   void *sender = NULL;
1184   void *sender_entry = NULL;
1185
1186   SILC_LOG_DEBUG(("Processing channel message"));
1187
1188   /* Sanity checks */
1189   if (packet->dst_id_type != SILC_ID_CHANNEL) {
1190     SILC_LOG_DEBUG(("Received bad message for channel, dropped"));
1191     goto out;
1192   }
1193
1194   /* Find channel entry */
1195   id = silc_id_str2id(packet->dst_id, packet->dst_id_len, SILC_ID_CHANNEL);
1196   if (!id)
1197     goto out;
1198   channel = silc_idlist_find_channel_by_id(server->local_list, id, NULL);
1199   if (!channel) {
1200     channel = silc_idlist_find_channel_by_id(server->global_list, id, NULL);
1201     if (!channel) {
1202       SILC_LOG_DEBUG(("Could not find channel"));
1203       goto out;
1204     }
1205   }
1206
1207   /* See that this client is on the channel. If the message is coming
1208      from router we won't do the check as the message is from client that
1209      we don't know about. Also, if the original sender is not client
1210      (as it can be server as well) we don't do the check. */
1211   sender = silc_id_str2id(packet->src_id, packet->src_id_len,
1212                           packet->src_id_type);
1213   if (!sender)
1214     goto out;
1215   if (packet->src_id_type == SILC_ID_CLIENT) {
1216     silc_list_start(channel->user_list);
1217     while ((chl = silc_list_get(channel->user_list)) != SILC_LIST_END) {
1218       if (chl->client && SILC_ID_CLIENT_COMPARE(chl->client->id, sender)) {
1219         sender_entry = chl->client;
1220         break;
1221       }
1222     }
1223     if (chl == SILC_LIST_END) {
1224       SILC_LOG_DEBUG(("Client not on channel"));
1225       goto out;
1226     }
1227   }
1228
1229   /* Distribute the packet to our local clients. This will send the
1230      packet for further routing as well, if needed. */
1231   silc_server_packet_relay_to_channel(server, sock, channel, sender,
1232                                       packet->src_id_type, sender_entry,
1233                                       packet->buffer->data,
1234                                       packet->buffer->len, FALSE);
1235
1236  out:
1237   if (sender)
1238     silc_free(sender);
1239   if (id)
1240     silc_free(id);
1241 }
1242
1243 /* Received channel key packet. We distribute the key to all of our locally
1244    connected clients on the channel. */
1245
1246 void silc_server_channel_key(SilcServer server,
1247                              SilcSocketConnection sock,
1248                              SilcPacketContext *packet)
1249 {
1250   SilcBuffer buffer = packet->buffer;
1251   SilcChannelEntry channel;
1252
1253   if (packet->src_id_type != SILC_ID_SERVER ||
1254       (server->server_type == SILC_ROUTER &&
1255        sock->type == SILC_SOCKET_TYPE_ROUTER))
1256     return;
1257
1258   /* Save the channel key */
1259   channel = silc_server_save_channel_key(server, buffer, NULL);
1260   if (!channel)
1261     return;
1262
1263   /* Distribute the key to everybody who is on the channel. If we are router
1264      we will also send it to locally connected servers. */
1265   silc_server_send_channel_key(server, sock, channel, FALSE);
1266 }
1267
1268 /* Received New Client packet and processes it.  Creates Client ID for the
1269    client. Client becomes registered after calling this functions. */
1270
1271 SilcClientEntry silc_server_new_client(SilcServer server,
1272                                        SilcSocketConnection sock,
1273                                        SilcPacketContext *packet)
1274 {
1275   SilcBuffer buffer = packet->buffer;
1276   SilcClientEntry client;
1277   SilcClientID *client_id;
1278   SilcBuffer reply;
1279   SilcIDListData idata;
1280   char *username = NULL, *realname = NULL, *id_string;
1281   uint32 id_len;
1282   int ret;
1283
1284   SILC_LOG_DEBUG(("Creating new client"));
1285
1286   if (sock->type != SILC_SOCKET_TYPE_CLIENT)
1287     return NULL;
1288
1289   /* Take client entry */
1290   client = (SilcClientEntry)sock->user_data;
1291   idata = (SilcIDListData)client;
1292
1293   /* Remove the old cache entry */
1294   silc_idcache_del_by_context(server->local_list->clients, client);
1295
1296   /* Parse incoming packet */
1297   ret = silc_buffer_unformat(buffer,
1298                              SILC_STR_UI16_STRING_ALLOC(&username),
1299                              SILC_STR_UI16_STRING_ALLOC(&realname),
1300                              SILC_STR_END);
1301   if (ret == -1) {
1302     if (username)
1303       silc_free(username);
1304     if (realname)
1305       silc_free(realname);
1306     silc_server_disconnect_remote(server, sock, "Server closed connection: "
1307                                   "Incomplete client information");
1308     return NULL;
1309   }
1310
1311   if (!username) {
1312     silc_free(username);
1313     if (realname)
1314       silc_free(realname);
1315     silc_server_disconnect_remote(server, sock, "Server closed connection: "
1316                                   "Incomplete client information");
1317     return NULL;
1318   }
1319
1320   /* Create Client ID */
1321   silc_id_create_client_id(server->id, server->rng, server->md5hash,
1322                            username, &client_id);
1323
1324   if (strlen(username) > 128)
1325     username[127] = '\0';
1326
1327   /* Update client entry */
1328   idata->registered = TRUE;
1329   client->nickname = strdup(username);
1330   client->username = username;
1331   client->userinfo = realname ? realname : strdup(" ");
1332   client->id = client_id;
1333   id_len = silc_id_get_len(client_id, SILC_ID_CLIENT);
1334
1335   /* Add the client again to the ID cache */
1336   silc_idcache_add(server->local_list->clients, client->nickname,
1337                    strlen(client->nickname), client_id, client, FALSE);
1338
1339   /* Notify our router about new client on the SILC network */
1340   if (!server->standalone)
1341     silc_server_send_new_id(server, (SilcSocketConnection)
1342                             server->router->connection,
1343                             server->server_type == SILC_ROUTER ? TRUE : FALSE,
1344                             client->id, SILC_ID_CLIENT, id_len);
1345
1346   /* Send the new client ID to the client. */
1347   id_string = silc_id_id2str(client->id, SILC_ID_CLIENT);
1348   reply = silc_buffer_alloc(2 + 2 + id_len);
1349   silc_buffer_pull_tail(reply, SILC_BUFFER_END(reply));
1350   silc_buffer_format(reply,
1351                      SILC_STR_UI_SHORT(SILC_ID_CLIENT),
1352                      SILC_STR_UI_SHORT(id_len),
1353                      SILC_STR_UI_XNSTRING(id_string, id_len),
1354                      SILC_STR_END);
1355   silc_server_packet_send(server, sock, SILC_PACKET_NEW_ID, 0,
1356                           reply->data, reply->len, FALSE);
1357   silc_free(id_string);
1358   silc_buffer_free(reply);
1359
1360   /* Send some nice info to the client */
1361   SILC_SERVER_SEND_NOTIFY(server, sock, SILC_NOTIFY_TYPE_NONE,
1362                           ("Welcome to the SILC Network %s@%s",
1363                            username, sock->hostname));
1364   SILC_SERVER_SEND_NOTIFY(server, sock, SILC_NOTIFY_TYPE_NONE,
1365                           ("Your host is %s, running version %s",
1366                            server->config->server_info->server_name,
1367                            server_version));
1368   if (server->server_type == SILC_ROUTER) {
1369     SILC_SERVER_SEND_NOTIFY(server, sock, SILC_NOTIFY_TYPE_NONE,
1370                             ("There are %d clients on %d servers in SILC "
1371                              "Network", server->stat.clients,
1372                              server->stat.servers + 1));
1373     SILC_SERVER_SEND_NOTIFY(server, sock, SILC_NOTIFY_TYPE_NONE,
1374                             ("There are %d clients on %d server in our cell",
1375                              server->stat.cell_clients,
1376                              server->stat.cell_servers + 1));
1377     SILC_SERVER_SEND_NOTIFY(server, sock, SILC_NOTIFY_TYPE_NONE,
1378                             ("I have %d clients, %d channels, %d servers and "
1379                              "%d routers",
1380                              server->stat.my_clients,
1381                              server->stat.my_channels,
1382                              server->stat.my_servers,
1383                              server->stat.my_routers));
1384     SILC_SERVER_SEND_NOTIFY(server, sock, SILC_NOTIFY_TYPE_NONE,
1385                             ("%d server operators and %d router operators "
1386                              "online",
1387                              server->stat.my_server_ops,
1388                              server->stat.my_router_ops));
1389   } else {
1390     SILC_SERVER_SEND_NOTIFY(server, sock, SILC_NOTIFY_TYPE_NONE,
1391                             ("I have %d clients and %d channels formed",
1392                              server->stat.my_clients,
1393                              server->stat.my_channels));
1394     SILC_SERVER_SEND_NOTIFY(server, sock, SILC_NOTIFY_TYPE_NONE,
1395                             ("%d operators online",
1396                              server->stat.my_server_ops));
1397   }
1398   SILC_SERVER_SEND_NOTIFY(server, sock, SILC_NOTIFY_TYPE_NONE,
1399                           ("Your connection is secured with %s cipher, "
1400                            "key length %d bits",
1401                            idata->send_key->cipher->name,
1402                            idata->send_key->cipher->key_len));
1403   SILC_SERVER_SEND_NOTIFY(server, sock, SILC_NOTIFY_TYPE_NONE,
1404                           ("Your current nickname is %s",
1405                            client->nickname));
1406
1407   /* Send motd */
1408   silc_server_send_motd(server, sock);
1409
1410   return client;
1411 }
1412
1413 /* Create new server. This processes received New Server packet and
1414    saves the received Server ID. The server is our locally connected
1415    server thus we save all the information and save it to local list.
1416    This funtion can be used by both normal server and router server.
1417    If normal server uses this it means that its router has connected
1418    to the server. If router uses this it means that one of the cell's
1419    servers is connected to the router. */
1420
1421 SilcServerEntry silc_server_new_server(SilcServer server,
1422                                        SilcSocketConnection sock,
1423                                        SilcPacketContext *packet)
1424 {
1425   SilcBuffer buffer = packet->buffer;
1426   SilcServerEntry new_server;
1427   SilcServerID *server_id;
1428   SilcIDListData idata;
1429   unsigned char *server_name, *id_string;
1430   uint16 id_len, name_len;
1431   int ret;
1432
1433   SILC_LOG_DEBUG(("Creating new server"));
1434
1435   if (sock->type != SILC_SOCKET_TYPE_SERVER &&
1436       sock->type != SILC_SOCKET_TYPE_ROUTER)
1437     return NULL;
1438
1439   /* Take server entry */
1440   new_server = (SilcServerEntry)sock->user_data;
1441   idata = (SilcIDListData)new_server;
1442
1443   /* Remove the old cache entry */
1444   silc_idcache_del_by_context(server->local_list->servers, new_server);
1445
1446   /* Parse the incoming packet */
1447   ret = silc_buffer_unformat(buffer,
1448                              SILC_STR_UI16_NSTRING_ALLOC(&id_string, &id_len),
1449                              SILC_STR_UI16_NSTRING_ALLOC(&server_name,
1450                                                          &name_len),
1451                              SILC_STR_END);
1452   if (ret == -1) {
1453     if (id_string)
1454       silc_free(id_string);
1455     if (server_name)
1456       silc_free(server_name);
1457     return NULL;
1458   }
1459
1460   if (id_len > buffer->len) {
1461     silc_free(id_string);
1462     silc_free(server_name);
1463     return NULL;
1464   }
1465
1466   if (name_len > 256)
1467     server_name[255] = '\0';
1468
1469   /* Get Server ID */
1470   server_id = silc_id_str2id(id_string, id_len, SILC_ID_SERVER);
1471   if (!server_id) {
1472     silc_free(id_string);
1473     silc_free(server_name);
1474     return NULL;
1475   }
1476   silc_free(id_string);
1477
1478   /* Update server entry */
1479   idata->registered = TRUE;
1480   new_server->server_name = server_name;
1481   new_server->id = server_id;
1482
1483   /* Add again the entry to the ID cache. */
1484   silc_idcache_add(server->local_list->servers, server_name,
1485                    strlen(server_name), server_id, server, FALSE);
1486
1487   /* Distribute the information about new server in the SILC network
1488      to our router. If we are normal server we won't send anything
1489      since this connection must be our router connection. */
1490   if (server->server_type == SILC_ROUTER && !server->standalone &&
1491       server->router->connection != sock)
1492     silc_server_send_new_id(server, server->router->connection,
1493                             TRUE, new_server->id, SILC_ID_SERVER,
1494                             silc_id_get_len(server_id, SILC_ID_SERVER));
1495
1496   if (server->server_type == SILC_ROUTER)
1497     server->stat.cell_servers++;
1498
1499   return new_server;
1500 }
1501
1502 /* Processes incoming New ID packet. New ID Payload is used to distribute
1503    information about newly registered clients and servers. */
1504
1505 static void silc_server_new_id_real(SilcServer server,
1506                                     SilcSocketConnection sock,
1507                                     SilcPacketContext *packet,
1508                                     int broadcast)
1509 {
1510   SilcBuffer buffer = packet->buffer;
1511   SilcIDList id_list;
1512   SilcServerEntry router;
1513   SilcSocketConnection router_sock;
1514   SilcIDPayload idp;
1515   SilcIdType id_type;
1516   unsigned char *hash = NULL;
1517   void *id;
1518
1519   SILC_LOG_DEBUG(("Processing new ID"));
1520
1521   if (sock->type == SILC_SOCKET_TYPE_CLIENT ||
1522       server->server_type == SILC_SERVER ||
1523       packet->src_id_type != SILC_ID_SERVER)
1524     return;
1525
1526   idp = silc_id_payload_parse(buffer);
1527   if (!idp)
1528     return;
1529
1530   id_type = silc_id_payload_get_type(idp);
1531
1532   /* Normal server cannot have other normal server connections */
1533   if (id_type == SILC_ID_SERVER && sock->type == SILC_SOCKET_TYPE_SERVER)
1534     goto out;
1535
1536   id = silc_id_payload_get_id(idp);
1537   if (!id)
1538     goto out;
1539
1540   /* If the sender of this packet is server and we are router we need to
1541      broadcast this packet to other routers in the network. */
1542   if (broadcast && !server->standalone && server->server_type == SILC_ROUTER &&
1543       sock->type == SILC_SOCKET_TYPE_SERVER &&
1544       !(packet->flags & SILC_PACKET_FLAG_BROADCAST)) {
1545     SILC_LOG_DEBUG(("Broadcasting received New ID packet"));
1546     silc_server_packet_send(server, server->router->connection,
1547                             packet->type,
1548                             packet->flags | SILC_PACKET_FLAG_BROADCAST,
1549                             buffer->data, buffer->len, FALSE);
1550   }
1551
1552   if (sock->type == SILC_SOCKET_TYPE_SERVER)
1553     id_list = server->local_list;
1554   else
1555     id_list = server->global_list;
1556
1557   /* If the packet is coming from server then use the sender as the
1558      origin of the the packet. If it came from router then check the real
1559      sender of the packet and use that as the origin. */
1560   if (sock->type == SILC_SOCKET_TYPE_SERVER) {
1561     router_sock = sock;
1562     router = sock->user_data;
1563   } else {
1564     void *sender_id = silc_id_str2id(packet->src_id, packet->src_id_len,
1565                                      packet->src_id_type);
1566     router = silc_idlist_find_server_by_id(server->global_list,
1567                                            sender_id, NULL);
1568     if (!router)
1569       router = silc_idlist_find_server_by_id(server->local_list,
1570                                              sender_id, NULL);
1571     silc_free(sender_id);
1572     if (!router)
1573       goto out;
1574     router_sock = sock;
1575   }
1576
1577   switch(id_type) {
1578   case SILC_ID_CLIENT:
1579     {
1580       SilcClientEntry entry;
1581
1582       SILC_LOG_DEBUG(("New client id(%s) from [%s] %s",
1583                       silc_id_render(id, SILC_ID_CLIENT),
1584                       sock->type == SILC_SOCKET_TYPE_SERVER ?
1585                       "Server" : "Router", sock->hostname));
1586
1587       /* As a router we keep information of all global information in our
1588          global list. Cell wide information however is kept in the local
1589          list. The client is put to global list and we will take the hash
1590          value of the Client ID and save it to the ID Cache system for fast
1591          searching in the future. */
1592       hash = silc_calloc(sizeof(((SilcClientID *)id)->hash),
1593                          sizeof(unsigned char));
1594       memcpy(hash, ((SilcClientID *)id)->hash,
1595              sizeof(((SilcClientID *)id)->hash));
1596       entry = silc_idlist_add_client(id_list, hash,
1597                                      sizeof(((SilcClientID *)id)->hash),
1598                                      NULL, NULL, id, router, NULL);
1599       entry->nickname = NULL;
1600       entry->data.registered = TRUE;
1601
1602       if (sock->type == SILC_SOCKET_TYPE_SERVER)
1603         server->stat.cell_clients++;
1604       server->stat.clients++;
1605     }
1606     break;
1607
1608   case SILC_ID_SERVER:
1609     /* If the ID is mine, ignore it. */
1610     if (SILC_ID_SERVER_COMPARE(id, server->id)) {
1611       SILC_LOG_DEBUG(("Ignoring my own ID as new ID"));
1612       break;
1613     }
1614
1615     SILC_LOG_DEBUG(("New server id(%s) from [%s] %s",
1616                     silc_id_render(id, SILC_ID_SERVER),
1617                     sock->type == SILC_SOCKET_TYPE_SERVER ?
1618                     "Server" : "Router", sock->hostname));
1619
1620     /* As a router we keep information of all global information in our global
1621        list. Cell wide information however is kept in the local list. */
1622     silc_idlist_add_server(id_list, NULL, 0, id, router, router_sock);
1623
1624     if (sock->type == SILC_SOCKET_TYPE_SERVER)
1625       server->stat.cell_servers++;
1626     server->stat.servers++;
1627     break;
1628
1629   case SILC_ID_CHANNEL:
1630     SILC_LOG_ERROR(("Channel cannot be registered with NEW_ID packet"));
1631     break;
1632
1633   default:
1634     break;
1635   }
1636
1637  out:
1638   silc_id_payload_free(idp);
1639 }
1640
1641
1642 /* Processes incoming New ID packet. New ID Payload is used to distribute
1643    information about newly registered clients and servers. */
1644
1645 void silc_server_new_id(SilcServer server, SilcSocketConnection sock,
1646                         SilcPacketContext *packet)
1647 {
1648   silc_server_new_id_real(server, sock, packet, TRUE);
1649 }
1650
1651 /* Receoved New Id List packet, list of New ID payloads inside one
1652    packet. Process the New ID payloads one by one. */
1653
1654 void silc_server_new_id_list(SilcServer server, SilcSocketConnection sock,
1655                              SilcPacketContext *packet)
1656 {
1657   SilcPacketContext *new_id;
1658   SilcBuffer idp;
1659   uint16 id_len;
1660
1661   SILC_LOG_DEBUG(("Processing New ID List"));
1662
1663   if (sock->type == SILC_SOCKET_TYPE_CLIENT ||
1664       packet->src_id_type != SILC_ID_SERVER)
1665     return;
1666
1667   /* If the sender of this packet is server and we are router we need to
1668      broadcast this packet to other routers in the network. Broadcast
1669      this list packet instead of multiple New ID packets. */
1670   if (!server->standalone && server->server_type == SILC_ROUTER &&
1671       sock->type == SILC_SOCKET_TYPE_SERVER &&
1672       !(packet->flags & SILC_PACKET_FLAG_BROADCAST)) {
1673     SILC_LOG_DEBUG(("Broadcasting received New ID List packet"));
1674     silc_server_packet_send(server, server->router->connection,
1675                             packet->type,
1676                             packet->flags | SILC_PACKET_FLAG_BROADCAST,
1677                             packet->buffer->data, packet->buffer->len, FALSE);
1678   }
1679
1680   /* Make copy of the original packet context, except for the actual
1681      data buffer, which we will here now fetch from the original buffer. */
1682   new_id = silc_packet_context_alloc();
1683   new_id->type = SILC_PACKET_NEW_ID;
1684   new_id->flags = packet->flags;
1685   new_id->src_id = packet->src_id;
1686   new_id->src_id_len = packet->src_id_len;
1687   new_id->src_id_type = packet->src_id_type;
1688   new_id->dst_id = packet->dst_id;
1689   new_id->dst_id_len = packet->dst_id_len;
1690   new_id->dst_id_type = packet->dst_id_type;
1691
1692   idp = silc_buffer_alloc(256);
1693   new_id->buffer = idp;
1694
1695   while (packet->buffer->len) {
1696     SILC_GET16_MSB(id_len, packet->buffer->data + 2);
1697     if ((id_len > packet->buffer->len) ||
1698         (id_len > idp->truelen))
1699       break;
1700
1701     silc_buffer_pull_tail(idp, 4 + id_len);
1702     silc_buffer_put(idp, packet->buffer->data, 4 + id_len);
1703
1704     /* Process the New ID */
1705     silc_server_new_id_real(server, sock, new_id, FALSE);
1706
1707     silc_buffer_push_tail(idp, 4 + id_len);
1708     silc_buffer_pull(packet->buffer, 4 + id_len);
1709   }
1710
1711   silc_buffer_free(idp);
1712   silc_free(new_id);
1713 }
1714
1715 /* Received New Channel packet. Information about new channels in the
1716    network are distributed using this packet. Save the information about
1717    the new channel. This usually comes from router but also normal server
1718    can send this to notify channels it has when it connects to us. */
1719
1720 void silc_server_new_channel(SilcServer server,
1721                              SilcSocketConnection sock,
1722                              SilcPacketContext *packet)
1723 {
1724   SilcChannelPayload payload;
1725   SilcChannelID *channel_id;
1726   char *channel_name;
1727   uint32 name_len;
1728   unsigned char *id;
1729   uint32 id_len;
1730   uint32 mode;
1731
1732   SILC_LOG_DEBUG(("Processing New Channel"));
1733
1734   if (sock->type == SILC_SOCKET_TYPE_CLIENT ||
1735       packet->src_id_type != SILC_ID_SERVER ||
1736       server->server_type == SILC_SERVER)
1737     return;
1738
1739   /* Parse the channel payload */
1740   payload = silc_channel_payload_parse(packet->buffer);
1741   if (!payload)
1742     return;
1743
1744   /* Get the channel ID */
1745   channel_id = silc_channel_get_id_parse(payload);
1746   if (!channel_id) {
1747     silc_channel_payload_free(payload);
1748     return;
1749   }
1750
1751   channel_name = silc_channel_get_name(payload, &name_len);
1752   if (name_len > 256)
1753     channel_name[255] = '\0';
1754
1755   id = silc_channel_get_id(payload, &id_len);
1756
1757   if (sock->type == SILC_SOCKET_TYPE_ROUTER) {
1758     /* Add the server to global list as it is coming from router. It
1759        cannot be our own channel as it is coming from router. */
1760
1761     SILC_LOG_DEBUG(("New channel id(%s) from [Router] %s",
1762                     silc_id_render(channel_id, SILC_ID_CHANNEL),
1763                     sock->hostname));
1764
1765     silc_idlist_add_channel(server->global_list, strdup(channel_name),
1766                             0, channel_id, server->router->connection,
1767                             NULL, NULL);
1768
1769     server->stat.channels++;
1770   } else {
1771     /* The channel is coming from our server, thus it is in our cell
1772        we will add it to our local list. */
1773     SilcChannelEntry channel;
1774     SilcBuffer chk;
1775
1776     SILC_LOG_DEBUG(("New channel id(%s) from [Server] %s",
1777                     silc_id_render(channel_id, SILC_ID_CHANNEL),
1778                     sock->hostname));
1779
1780     /* Check that we don't already have this channel */
1781     channel = silc_idlist_find_channel_by_name(server->local_list,
1782                                                channel_name, NULL);
1783     if (!channel)
1784       channel = silc_idlist_find_channel_by_name(server->global_list,
1785                                                  channel_name, NULL);
1786
1787     /* If the channel does not exist, then create it. We create the channel
1788        with the channel ID provided by the server. This creates a new
1789        key to the channel as well that we will send to the server. */
1790     if (!channel) {
1791       channel = silc_server_create_new_channel_with_id(server, NULL, NULL,
1792                                                        channel_name,
1793                                                        channel_id, FALSE);
1794       if (!channel) {
1795         silc_channel_payload_free(payload);
1796         silc_free(channel_id);
1797         return;
1798       }
1799
1800       /* Send the new channel key to the server */
1801       chk = silc_channel_key_payload_encode(id_len, id,
1802                                             strlen(channel->channel_key->
1803                                                    cipher->name),
1804                                             channel->channel_key->cipher->name,
1805                                             channel->key_len / 8,
1806                                             channel->key);
1807       silc_server_packet_send(server, sock, SILC_PACKET_CHANNEL_KEY, 0,
1808                               chk->data, chk->len, FALSE);
1809       silc_buffer_free(chk);
1810
1811     } else {
1812       /* The channel exist by that name, check whether the ID's match.
1813          If they don't then we'll force the server to use the ID we have.
1814          We also create a new key for the channel. */
1815       SilcBuffer users = NULL, users_modes = NULL;
1816
1817       if (!channel->id)
1818         channel_id = silc_id_dup(channel_id, SILC_ID_CHANNEL);
1819
1820       if (!SILC_ID_CHANNEL_COMPARE(channel_id, channel->id)) {
1821         /* They don't match, send CHANNEL_CHANGE notify to the server to
1822            force the ID change. */
1823         SILC_LOG_DEBUG(("Forcing the server to change Channel ID"));
1824         silc_server_send_notify_channel_change(server, sock, FALSE,
1825                                                channel_id, channel->id);
1826       }
1827
1828       /* If the mode is different from what we have then enforce the
1829          mode change. */
1830       mode = silc_channel_get_mode(payload);
1831       if (channel->mode != mode) {
1832         SILC_LOG_DEBUG(("Forcing the server to change channel mode"));
1833         silc_server_send_notify_cmode(server, sock, FALSE, channel,
1834                                       channel->mode, server->id,
1835                                       SILC_ID_SERVER,
1836                                       channel->cipher, channel->hmac_name);
1837       }
1838
1839       /* Create new key for the channel and send it to the server and
1840          everybody else possibly on the channel. */
1841
1842       if (!(channel->mode & SILC_CHANNEL_MODE_PRIVKEY)) {
1843         silc_server_create_channel_key(server, channel, 0);
1844
1845         /* Send to the channel */
1846         silc_server_send_channel_key(server, sock, channel, FALSE);
1847         id = silc_id_id2str(channel->id, SILC_ID_CHANNEL);
1848         id_len = SILC_ID_CHANNEL_LEN;
1849
1850         /* Send to the server */
1851         chk = silc_channel_key_payload_encode(id_len, id,
1852                                               strlen(channel->channel_key->
1853                                                      cipher->name),
1854                                               channel->channel_key->
1855                                               cipher->name,
1856                                               channel->key_len / 8,
1857                                               channel->key);
1858         silc_server_packet_send(server, sock, SILC_PACKET_CHANNEL_KEY, 0,
1859                                 chk->data, chk->len, FALSE);
1860         silc_buffer_free(chk);
1861         silc_free(id);
1862       }
1863
1864       silc_free(channel_id);
1865
1866       /* Since the channel is coming from server and we also know about it
1867          then send the JOIN notify to the server so that it see's our
1868          users on the channel "joining" the channel. */
1869       silc_server_announce_get_channel_users(server, channel, &users,
1870                                              &users_modes);
1871       if (users) {
1872         silc_buffer_push(users, users->data - users->head);
1873         silc_server_packet_send(server, sock,
1874                                 SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
1875                                 users->data, users->len, FALSE);
1876         silc_buffer_free(users);
1877       }
1878       if (users_modes) {
1879         silc_buffer_push(users_modes, users_modes->data - users_modes->head);
1880         silc_server_packet_send(server, sock,
1881                                 SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
1882                                 users_modes->data, users_modes->len, FALSE);
1883         silc_buffer_free(users_modes);
1884       }
1885     }
1886   }
1887
1888   silc_channel_payload_free(payload);
1889 }
1890
1891 /* Received New Channel List packet, list of New Channel List payloads inside
1892    one packet. Process the New Channel payloads one by one. */
1893
1894 void silc_server_new_channel_list(SilcServer server,
1895                                   SilcSocketConnection sock,
1896                                   SilcPacketContext *packet)
1897 {
1898   SilcPacketContext *new;
1899   SilcBuffer buffer;
1900   uint16 len1, len2;
1901
1902   SILC_LOG_DEBUG(("Processing New Channel List"));
1903
1904   if (sock->type == SILC_SOCKET_TYPE_CLIENT ||
1905       packet->src_id_type != SILC_ID_SERVER ||
1906       server->server_type == SILC_SERVER)
1907     return;
1908
1909   /* If the sender of this packet is server and we are router we need to
1910      broadcast this packet to other routers in the network. Broadcast
1911      this list packet instead of multiple New Channel packets. */
1912   if (!server->standalone && server->server_type == SILC_ROUTER &&
1913       sock->type == SILC_SOCKET_TYPE_SERVER &&
1914       !(packet->flags & SILC_PACKET_FLAG_BROADCAST)) {
1915     SILC_LOG_DEBUG(("Broadcasting received New Channel List packet"));
1916     silc_server_packet_send(server, server->router->connection,
1917                             packet->type,
1918                             packet->flags | SILC_PACKET_FLAG_BROADCAST,
1919                             packet->buffer->data, packet->buffer->len, FALSE);
1920   }
1921
1922   /* Make copy of the original packet context, except for the actual
1923      data buffer, which we will here now fetch from the original buffer. */
1924   new = silc_packet_context_alloc();
1925   new->type = SILC_PACKET_NEW_CHANNEL;
1926   new->flags = packet->flags;
1927   new->src_id = packet->src_id;
1928   new->src_id_len = packet->src_id_len;
1929   new->src_id_type = packet->src_id_type;
1930   new->dst_id = packet->dst_id;
1931   new->dst_id_len = packet->dst_id_len;
1932   new->dst_id_type = packet->dst_id_type;
1933
1934   buffer = silc_buffer_alloc(512);
1935   new->buffer = buffer;
1936
1937   while (packet->buffer->len) {
1938     SILC_GET16_MSB(len1, packet->buffer->data);
1939     if ((len1 > packet->buffer->len) ||
1940         (len1 > buffer->truelen))
1941       break;
1942
1943     SILC_GET16_MSB(len2, packet->buffer->data + 2 + len1);
1944     if ((len2 > packet->buffer->len) ||
1945         (len2 > buffer->truelen))
1946       break;
1947
1948     silc_buffer_pull_tail(buffer, 8 + len1 + len2);
1949     silc_buffer_put(buffer, packet->buffer->data, 8 + len1 + len2);
1950
1951     /* Process the New Channel */
1952     silc_server_new_channel(server, sock, new);
1953
1954     silc_buffer_push_tail(buffer, 8 + len1 + len2);
1955     silc_buffer_pull(packet->buffer, 8 + len1 + len2);
1956   }
1957
1958   silc_buffer_free(buffer);
1959   silc_free(new);
1960 }
1961
1962 /* Received key agreement packet. This packet is never for us. It is to
1963    the client in the packet's destination ID. Sending of this sort of packet
1964    equals sending private message, ie. it is sent point to point from
1965    one client to another. */
1966
1967 void silc_server_key_agreement(SilcServer server,
1968                                SilcSocketConnection sock,
1969                                SilcPacketContext *packet)
1970 {
1971   SilcSocketConnection dst_sock;
1972   SilcIDListData idata;
1973
1974   SILC_LOG_DEBUG(("Start"));
1975
1976   if (packet->src_id_type != SILC_ID_CLIENT ||
1977       packet->dst_id_type != SILC_ID_CLIENT)
1978     return;
1979
1980   if (!packet->dst_id)
1981     return;
1982
1983   /* Get the route to the client */
1984   dst_sock = silc_server_get_client_route(server, packet->dst_id,
1985                                           packet->dst_id_len, NULL, &idata);
1986   if (!dst_sock)
1987     return;
1988
1989   /* Relay the packet */
1990   silc_server_relay_packet(server, dst_sock, idata->send_key,
1991                            idata->hmac_send, packet, FALSE);
1992 }
1993
1994 /* Received connection auth request packet that is used during connection
1995    phase to resolve the mandatory authentication method.  This packet can
1996    actually be received at anytime but usually it is used only during
1997    the connection authentication phase. Now, protocol says that this packet
1998    can come from client or server, however, we support only this coming
1999    from client and expect that server's always knows what authentication
2000    method to use. */
2001
2002 void silc_server_connection_auth_request(SilcServer server,
2003                                          SilcSocketConnection sock,
2004                                          SilcPacketContext *packet)
2005 {
2006   SilcServerConfigSectionClientConnection *client = NULL;
2007   uint16 conn_type;
2008   int ret;
2009   SilcAuthMethod auth_meth;
2010
2011   SILC_LOG_DEBUG(("Start"));
2012
2013   if (packet->src_id_type && packet->src_id_type != SILC_ID_CLIENT)
2014     return;
2015
2016   /* Parse the payload */
2017   ret = silc_buffer_unformat(packet->buffer,
2018                              SILC_STR_UI_SHORT(&conn_type),
2019                              SILC_STR_UI_SHORT(NULL),
2020                              SILC_STR_END);
2021   if (ret == -1)
2022     return;
2023
2024   if (conn_type != SILC_SOCKET_TYPE_CLIENT)
2025     return;
2026
2027   /* Get the authentication method for the client */
2028   auth_meth = SILC_AUTH_NONE;
2029   client = silc_server_config_find_client_conn(server->config,
2030                                                sock->ip,
2031                                                sock->port);
2032   if (!client)
2033     client = silc_server_config_find_client_conn(server->config,
2034                                                  sock->hostname,
2035                                                  sock->port);
2036   if (client)
2037     auth_meth = client->auth_meth;
2038
2039   /* Send it back to the client */
2040   silc_server_send_connection_auth_request(server, sock,
2041                                            conn_type,
2042                                            auth_meth);
2043 }
2044
2045 /* Received REKEY packet. The sender of the packet wants to regenerate
2046    its session keys. This starts the REKEY protocol. */
2047
2048 void silc_server_rekey(SilcServer server,
2049                        SilcSocketConnection sock,
2050                        SilcPacketContext *packet)
2051 {
2052   SilcProtocol protocol;
2053   SilcServerRekeyInternalContext *proto_ctx;
2054   SilcIDListData idata = (SilcIDListData)sock->user_data;
2055
2056   SILC_LOG_DEBUG(("Start"));
2057
2058   /* Allocate internal protocol context. This is sent as context
2059      to the protocol. */
2060   proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
2061   proto_ctx->server = (void *)server;
2062   proto_ctx->sock = sock;
2063   proto_ctx->responder = TRUE;
2064   proto_ctx->pfs = idata->rekey->pfs;
2065
2066   /* Perform rekey protocol. Will call the final callback after the
2067      protocol is over. */
2068   silc_protocol_alloc(SILC_PROTOCOL_SERVER_REKEY,
2069                       &protocol, proto_ctx, silc_server_rekey_final);
2070   sock->protocol = protocol;
2071
2072   if (proto_ctx->pfs == FALSE)
2073     /* Run the protocol */
2074     protocol->execute(server->timeout_queue, 0, protocol, sock->sock, 0, 0);
2075 }