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, 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   if (!silc_idcache_del_by_context(server->local_list->clients, client)) {
1295     SILC_LOG_ERROR(("Lost client's cache entry - bad thing"));
1296     silc_server_disconnect_remote(server, sock, "Server closed connection: "
1297                                   "Unknown client");
1298     return NULL;
1299   }
1300
1301   /* Parse incoming packet */
1302   ret = silc_buffer_unformat(buffer,
1303                              SILC_STR_UI16_STRING_ALLOC(&username),
1304                              SILC_STR_UI16_STRING_ALLOC(&realname),
1305                              SILC_STR_END);
1306   if (ret == -1) {
1307     if (username)
1308       silc_free(username);
1309     if (realname)
1310       silc_free(realname);
1311     silc_server_disconnect_remote(server, sock, "Server closed connection: "
1312                                   "Incomplete client information");
1313     return NULL;
1314   }
1315
1316   if (!username) {
1317     silc_free(username);
1318     if (realname)
1319       silc_free(realname);
1320     silc_server_disconnect_remote(server, sock, "Server closed connection: "
1321                                   "Incomplete client information");
1322     return NULL;
1323   }
1324
1325   /* Create Client ID */
1326   silc_id_create_client_id(server->id, server->rng, server->md5hash,
1327                            username, &client_id);
1328
1329   if (strlen(username) > 128)
1330     username[127] = '\0';
1331
1332   /* Update client entry */
1333   idata->registered = TRUE;
1334   client->nickname = strdup(username);
1335   client->username = username;
1336   client->userinfo = realname ? realname : strdup(" ");
1337   client->id = client_id;
1338   id_len = silc_id_get_len(client_id, SILC_ID_CLIENT);
1339
1340   /* Add the client again to the ID cache */
1341   silc_idcache_add(server->local_list->clients, client->nickname,
1342                    client_id, client, FALSE);
1343
1344   /* Notify our router about new client on the SILC network */
1345   if (!server->standalone)
1346     silc_server_send_new_id(server, (SilcSocketConnection)
1347                             server->router->connection,
1348                             server->server_type == SILC_ROUTER ? TRUE : FALSE,
1349                             client->id, SILC_ID_CLIENT, id_len);
1350
1351   /* Send the new client ID to the client. */
1352   id_string = silc_id_id2str(client->id, SILC_ID_CLIENT);
1353   reply = silc_buffer_alloc(2 + 2 + id_len);
1354   silc_buffer_pull_tail(reply, SILC_BUFFER_END(reply));
1355   silc_buffer_format(reply,
1356                      SILC_STR_UI_SHORT(SILC_ID_CLIENT),
1357                      SILC_STR_UI_SHORT(id_len),
1358                      SILC_STR_UI_XNSTRING(id_string, id_len),
1359                      SILC_STR_END);
1360   silc_server_packet_send(server, sock, SILC_PACKET_NEW_ID, 0,
1361                           reply->data, reply->len, FALSE);
1362   silc_free(id_string);
1363   silc_buffer_free(reply);
1364
1365   /* Send some nice info to the client */
1366   SILC_SERVER_SEND_NOTIFY(server, sock, SILC_NOTIFY_TYPE_NONE,
1367                           ("Welcome to the SILC Network %s@%s",
1368                            username, sock->hostname));
1369   SILC_SERVER_SEND_NOTIFY(server, sock, SILC_NOTIFY_TYPE_NONE,
1370                           ("Your host is %s, running version %s",
1371                            server->config->server_info->server_name,
1372                            server_version));
1373   if (server->server_type == SILC_ROUTER) {
1374     SILC_SERVER_SEND_NOTIFY(server, sock, SILC_NOTIFY_TYPE_NONE,
1375                             ("There are %d clients on %d servers in SILC "
1376                              "Network", server->stat.clients,
1377                              server->stat.servers + 1));
1378     SILC_SERVER_SEND_NOTIFY(server, sock, SILC_NOTIFY_TYPE_NONE,
1379                             ("There are %d clients on %d server in our cell",
1380                              server->stat.cell_clients,
1381                              server->stat.cell_servers + 1));
1382     SILC_SERVER_SEND_NOTIFY(server, sock, SILC_NOTIFY_TYPE_NONE,
1383                             ("I have %d clients, %d channels, %d servers and "
1384                              "%d routers",
1385                              server->stat.my_clients,
1386                              server->stat.my_channels,
1387                              server->stat.my_servers,
1388                              server->stat.my_routers));
1389     SILC_SERVER_SEND_NOTIFY(server, sock, SILC_NOTIFY_TYPE_NONE,
1390                             ("%d server operators and %d router operators "
1391                              "online",
1392                              server->stat.my_server_ops,
1393                              server->stat.my_router_ops));
1394   } else {
1395     SILC_SERVER_SEND_NOTIFY(server, sock, SILC_NOTIFY_TYPE_NONE,
1396                             ("I have %d clients and %d channels formed",
1397                              server->stat.my_clients,
1398                              server->stat.my_channels));
1399     SILC_SERVER_SEND_NOTIFY(server, sock, SILC_NOTIFY_TYPE_NONE,
1400                             ("%d operators online",
1401                              server->stat.my_server_ops));
1402   }
1403   SILC_SERVER_SEND_NOTIFY(server, sock, SILC_NOTIFY_TYPE_NONE,
1404                           ("Your connection is secured with %s cipher, "
1405                            "key length %d bits",
1406                            idata->send_key->cipher->name,
1407                            idata->send_key->cipher->key_len));
1408   SILC_SERVER_SEND_NOTIFY(server, sock, SILC_NOTIFY_TYPE_NONE,
1409                           ("Your current nickname is %s",
1410                            client->nickname));
1411
1412   /* Send motd */
1413   silc_server_send_motd(server, sock);
1414
1415   return client;
1416 }
1417
1418 /* Create new server. This processes received New Server packet and
1419    saves the received Server ID. The server is our locally connected
1420    server thus we save all the information and save it to local list.
1421    This funtion can be used by both normal server and router server.
1422    If normal server uses this it means that its router has connected
1423    to the server. If router uses this it means that one of the cell's
1424    servers is connected to the router. */
1425
1426 SilcServerEntry silc_server_new_server(SilcServer server,
1427                                        SilcSocketConnection sock,
1428                                        SilcPacketContext *packet)
1429 {
1430   SilcBuffer buffer = packet->buffer;
1431   SilcServerEntry new_server;
1432   SilcServerID *server_id;
1433   SilcIDListData idata;
1434   unsigned char *server_name, *id_string;
1435   uint16 id_len, name_len;
1436   int ret;
1437
1438   SILC_LOG_DEBUG(("Creating new server"));
1439
1440   if (sock->type != SILC_SOCKET_TYPE_SERVER &&
1441       sock->type != SILC_SOCKET_TYPE_ROUTER)
1442     return NULL;
1443
1444   /* Take server entry */
1445   new_server = (SilcServerEntry)sock->user_data;
1446   idata = (SilcIDListData)new_server;
1447
1448   /* Remove the old cache entry */
1449   silc_idcache_del_by_context(server->local_list->servers, new_server);
1450
1451   /* Parse the incoming packet */
1452   ret = silc_buffer_unformat(buffer,
1453                              SILC_STR_UI16_NSTRING_ALLOC(&id_string, &id_len),
1454                              SILC_STR_UI16_NSTRING_ALLOC(&server_name,
1455                                                          &name_len),
1456                              SILC_STR_END);
1457   if (ret == -1) {
1458     if (id_string)
1459       silc_free(id_string);
1460     if (server_name)
1461       silc_free(server_name);
1462     return NULL;
1463   }
1464
1465   if (id_len > buffer->len) {
1466     silc_free(id_string);
1467     silc_free(server_name);
1468     return NULL;
1469   }
1470
1471   if (name_len > 256)
1472     server_name[255] = '\0';
1473
1474   /* Get Server ID */
1475   server_id = silc_id_str2id(id_string, id_len, SILC_ID_SERVER);
1476   if (!server_id) {
1477     silc_free(id_string);
1478     silc_free(server_name);
1479     return NULL;
1480   }
1481   silc_free(id_string);
1482
1483   /* Update server entry */
1484   idata->registered = TRUE;
1485   new_server->server_name = server_name;
1486   new_server->id = server_id;
1487
1488   /* Add again the entry to the ID cache. */
1489   silc_idcache_add(server->local_list->servers, server_name, server_id,
1490                    server, FALSE);
1491
1492   /* Distribute the information about new server in the SILC network
1493      to our router. If we are normal server we won't send anything
1494      since this connection must be our router connection. */
1495   if (server->server_type == SILC_ROUTER && !server->standalone &&
1496       server->router->connection != sock)
1497     silc_server_send_new_id(server, server->router->connection,
1498                             TRUE, new_server->id, SILC_ID_SERVER,
1499                             silc_id_get_len(server_id, SILC_ID_SERVER));
1500
1501   if (server->server_type == SILC_ROUTER)
1502     server->stat.cell_servers++;
1503
1504   return new_server;
1505 }
1506
1507 /* Processes incoming New ID packet. New ID Payload is used to distribute
1508    information about newly registered clients and servers. */
1509
1510 static void silc_server_new_id_real(SilcServer server,
1511                                     SilcSocketConnection sock,
1512                                     SilcPacketContext *packet,
1513                                     int broadcast)
1514 {
1515   SilcBuffer buffer = packet->buffer;
1516   SilcIDList id_list;
1517   SilcServerEntry router;
1518   SilcSocketConnection router_sock;
1519   SilcIDPayload idp;
1520   SilcIdType id_type;
1521   void *id;
1522
1523   SILC_LOG_DEBUG(("Processing new ID"));
1524
1525   if (sock->type == SILC_SOCKET_TYPE_CLIENT ||
1526       server->server_type == SILC_SERVER ||
1527       packet->src_id_type != SILC_ID_SERVER)
1528     return;
1529
1530   idp = silc_id_payload_parse(buffer);
1531   if (!idp)
1532     return;
1533
1534   id_type = silc_id_payload_get_type(idp);
1535
1536   /* Normal server cannot have other normal server connections */
1537   if (id_type == SILC_ID_SERVER && sock->type == SILC_SOCKET_TYPE_SERVER)
1538     goto out;
1539
1540   id = silc_id_payload_get_id(idp);
1541   if (!id)
1542     goto out;
1543
1544   /* If the sender of this packet is server and we are router we need to
1545      broadcast this packet to other routers in the network. */
1546   if (broadcast && !server->standalone && server->server_type == SILC_ROUTER &&
1547       sock->type == SILC_SOCKET_TYPE_SERVER &&
1548       !(packet->flags & SILC_PACKET_FLAG_BROADCAST)) {
1549     SILC_LOG_DEBUG(("Broadcasting received New ID packet"));
1550     silc_server_packet_send(server, server->router->connection,
1551                             packet->type,
1552                             packet->flags | SILC_PACKET_FLAG_BROADCAST,
1553                             buffer->data, buffer->len, FALSE);
1554   }
1555
1556   if (sock->type == SILC_SOCKET_TYPE_SERVER)
1557     id_list = server->local_list;
1558   else
1559     id_list = server->global_list;
1560
1561   /* If the packet is coming from server then use the sender as the
1562      origin of the the packet. If it came from router then check the real
1563      sender of the packet and use that as the origin. */
1564   if (sock->type == SILC_SOCKET_TYPE_SERVER) {
1565     router_sock = sock;
1566     router = sock->user_data;
1567   } else {
1568     void *sender_id = silc_id_str2id(packet->src_id, packet->src_id_len,
1569                                      packet->src_id_type);
1570     router = silc_idlist_find_server_by_id(server->global_list,
1571                                            sender_id, NULL);
1572     if (!router)
1573       router = silc_idlist_find_server_by_id(server->local_list,
1574                                              sender_id, NULL);
1575     silc_free(sender_id);
1576     if (!router)
1577       goto out;
1578     router_sock = sock;
1579   }
1580
1581   switch(id_type) {
1582   case SILC_ID_CLIENT:
1583     {
1584       SilcClientEntry entry;
1585
1586       SILC_LOG_DEBUG(("New client id(%s) from [%s] %s",
1587                       silc_id_render(id, SILC_ID_CLIENT),
1588                       sock->type == SILC_SOCKET_TYPE_SERVER ?
1589                       "Server" : "Router", sock->hostname));
1590
1591       /* As a router we keep information of all global information in our
1592          global list. Cell wide information however is kept in the local
1593          list. */
1594       entry = silc_idlist_add_client(id_list, NULL, NULL, NULL,
1595                                      id, router, NULL);
1596       entry->nickname = NULL;
1597       entry->data.registered = TRUE;
1598
1599       if (sock->type == SILC_SOCKET_TYPE_SERVER)
1600         server->stat.cell_clients++;
1601       server->stat.clients++;
1602     }
1603     break;
1604
1605   case SILC_ID_SERVER:
1606     /* If the ID is mine, ignore it. */
1607     if (SILC_ID_SERVER_COMPARE(id, server->id)) {
1608       SILC_LOG_DEBUG(("Ignoring my own ID as new ID"));
1609       break;
1610     }
1611
1612     SILC_LOG_DEBUG(("New server id(%s) from [%s] %s",
1613                     silc_id_render(id, SILC_ID_SERVER),
1614                     sock->type == SILC_SOCKET_TYPE_SERVER ?
1615                     "Server" : "Router", sock->hostname));
1616
1617     /* As a router we keep information of all global information in our global
1618        list. Cell wide information however is kept in the local list. */
1619     silc_idlist_add_server(id_list, NULL, 0, id, router, router_sock);
1620
1621     if (sock->type == SILC_SOCKET_TYPE_SERVER)
1622       server->stat.cell_servers++;
1623     server->stat.servers++;
1624     break;
1625
1626   case SILC_ID_CHANNEL:
1627     SILC_LOG_ERROR(("Channel cannot be registered with NEW_ID packet"));
1628     break;
1629
1630   default:
1631     break;
1632   }
1633
1634  out:
1635   silc_id_payload_free(idp);
1636 }
1637
1638
1639 /* Processes incoming New ID packet. New ID Payload is used to distribute
1640    information about newly registered clients and servers. */
1641
1642 void silc_server_new_id(SilcServer server, SilcSocketConnection sock,
1643                         SilcPacketContext *packet)
1644 {
1645   silc_server_new_id_real(server, sock, packet, TRUE);
1646 }
1647
1648 /* Receoved New Id List packet, list of New ID payloads inside one
1649    packet. Process the New ID payloads one by one. */
1650
1651 void silc_server_new_id_list(SilcServer server, SilcSocketConnection sock,
1652                              SilcPacketContext *packet)
1653 {
1654   SilcPacketContext *new_id;
1655   SilcBuffer idp;
1656   uint16 id_len;
1657
1658   SILC_LOG_DEBUG(("Processing New ID List"));
1659
1660   if (sock->type == SILC_SOCKET_TYPE_CLIENT ||
1661       packet->src_id_type != SILC_ID_SERVER)
1662     return;
1663
1664   /* If the sender of this packet is server and we are router we need to
1665      broadcast this packet to other routers in the network. Broadcast
1666      this list packet instead of multiple New ID packets. */
1667   if (!server->standalone && server->server_type == SILC_ROUTER &&
1668       sock->type == SILC_SOCKET_TYPE_SERVER &&
1669       !(packet->flags & SILC_PACKET_FLAG_BROADCAST)) {
1670     SILC_LOG_DEBUG(("Broadcasting received New ID List packet"));
1671     silc_server_packet_send(server, server->router->connection,
1672                             packet->type,
1673                             packet->flags | SILC_PACKET_FLAG_BROADCAST,
1674                             packet->buffer->data, packet->buffer->len, FALSE);
1675   }
1676
1677   /* Make copy of the original packet context, except for the actual
1678      data buffer, which we will here now fetch from the original buffer. */
1679   new_id = silc_packet_context_alloc();
1680   new_id->type = SILC_PACKET_NEW_ID;
1681   new_id->flags = packet->flags;
1682   new_id->src_id = packet->src_id;
1683   new_id->src_id_len = packet->src_id_len;
1684   new_id->src_id_type = packet->src_id_type;
1685   new_id->dst_id = packet->dst_id;
1686   new_id->dst_id_len = packet->dst_id_len;
1687   new_id->dst_id_type = packet->dst_id_type;
1688
1689   idp = silc_buffer_alloc(256);
1690   new_id->buffer = idp;
1691
1692   while (packet->buffer->len) {
1693     SILC_GET16_MSB(id_len, packet->buffer->data + 2);
1694     if ((id_len > packet->buffer->len) ||
1695         (id_len > idp->truelen))
1696       break;
1697
1698     silc_buffer_pull_tail(idp, 4 + id_len);
1699     silc_buffer_put(idp, packet->buffer->data, 4 + id_len);
1700
1701     /* Process the New ID */
1702     silc_server_new_id_real(server, sock, new_id, FALSE);
1703
1704     silc_buffer_push_tail(idp, 4 + id_len);
1705     silc_buffer_pull(packet->buffer, 4 + id_len);
1706   }
1707
1708   silc_buffer_free(idp);
1709   silc_free(new_id);
1710 }
1711
1712 /* Received New Channel packet. Information about new channels in the
1713    network are distributed using this packet. Save the information about
1714    the new channel. This usually comes from router but also normal server
1715    can send this to notify channels it has when it connects to us. */
1716
1717 void silc_server_new_channel(SilcServer server,
1718                              SilcSocketConnection sock,
1719                              SilcPacketContext *packet)
1720 {
1721   SilcChannelPayload payload;
1722   SilcChannelID *channel_id;
1723   char *channel_name;
1724   uint32 name_len;
1725   unsigned char *id;
1726   uint32 id_len;
1727   uint32 mode;
1728
1729   SILC_LOG_DEBUG(("Processing New Channel"));
1730
1731   if (sock->type == SILC_SOCKET_TYPE_CLIENT ||
1732       packet->src_id_type != SILC_ID_SERVER ||
1733       server->server_type == SILC_SERVER)
1734     return;
1735
1736   /* Parse the channel payload */
1737   payload = silc_channel_payload_parse(packet->buffer);
1738   if (!payload)
1739     return;
1740
1741   /* Get the channel ID */
1742   channel_id = silc_channel_get_id_parse(payload);
1743   if (!channel_id) {
1744     silc_channel_payload_free(payload);
1745     return;
1746   }
1747
1748   channel_name = silc_channel_get_name(payload, &name_len);
1749   if (name_len > 256)
1750     channel_name[255] = '\0';
1751
1752   id = silc_channel_get_id(payload, &id_len);
1753
1754   if (sock->type == SILC_SOCKET_TYPE_ROUTER) {
1755     /* Add the server to global list as it is coming from router. It
1756        cannot be our own channel as it is coming from router. */
1757
1758     SILC_LOG_DEBUG(("New channel id(%s) from [Router] %s",
1759                     silc_id_render(channel_id, SILC_ID_CHANNEL),
1760                     sock->hostname));
1761
1762     silc_idlist_add_channel(server->global_list, strdup(channel_name),
1763                             0, channel_id, server->router->connection,
1764                             NULL, NULL);
1765
1766     server->stat.channels++;
1767   } else {
1768     /* The channel is coming from our server, thus it is in our cell
1769        we will add it to our local list. */
1770     SilcChannelEntry channel;
1771     SilcBuffer chk;
1772
1773     SILC_LOG_DEBUG(("New channel id(%s) from [Server] %s",
1774                     silc_id_render(channel_id, SILC_ID_CHANNEL),
1775                     sock->hostname));
1776
1777     /* Check that we don't already have this channel */
1778     channel = silc_idlist_find_channel_by_name(server->local_list,
1779                                                channel_name, NULL);
1780     if (!channel)
1781       channel = silc_idlist_find_channel_by_name(server->global_list,
1782                                                  channel_name, NULL);
1783
1784     /* If the channel does not exist, then create it. We create the channel
1785        with the channel ID provided by the server. This creates a new
1786        key to the channel as well that we will send to the server. */
1787     if (!channel) {
1788       channel = silc_server_create_new_channel_with_id(server, NULL, NULL,
1789                                                        channel_name,
1790                                                        channel_id, FALSE);
1791       if (!channel) {
1792         silc_channel_payload_free(payload);
1793         silc_free(channel_id);
1794         return;
1795       }
1796
1797       /* Send the new channel key to the server */
1798       chk = silc_channel_key_payload_encode(id_len, id,
1799                                             strlen(channel->channel_key->
1800                                                    cipher->name),
1801                                             channel->channel_key->cipher->name,
1802                                             channel->key_len / 8,
1803                                             channel->key);
1804       silc_server_packet_send(server, sock, SILC_PACKET_CHANNEL_KEY, 0,
1805                               chk->data, chk->len, FALSE);
1806       silc_buffer_free(chk);
1807
1808     } else {
1809       /* The channel exist by that name, check whether the ID's match.
1810          If they don't then we'll force the server to use the ID we have.
1811          We also create a new key for the channel. */
1812       SilcBuffer users = NULL, users_modes = NULL;
1813
1814       if (!channel->id)
1815         channel_id = silc_id_dup(channel_id, SILC_ID_CHANNEL);
1816
1817       if (!SILC_ID_CHANNEL_COMPARE(channel_id, channel->id)) {
1818         /* They don't match, send CHANNEL_CHANGE notify to the server to
1819            force the ID change. */
1820         SILC_LOG_DEBUG(("Forcing the server to change Channel ID"));
1821         silc_server_send_notify_channel_change(server, sock, FALSE,
1822                                                channel_id, channel->id);
1823       }
1824
1825       /* If the mode is different from what we have then enforce the
1826          mode change. */
1827       mode = silc_channel_get_mode(payload);
1828       if (channel->mode != mode) {
1829         SILC_LOG_DEBUG(("Forcing the server to change channel mode"));
1830         silc_server_send_notify_cmode(server, sock, FALSE, channel,
1831                                       channel->mode, server->id,
1832                                       SILC_ID_SERVER,
1833                                       channel->cipher, channel->hmac_name);
1834       }
1835
1836       /* Create new key for the channel and send it to the server and
1837          everybody else possibly on the channel. */
1838
1839       if (!(channel->mode & SILC_CHANNEL_MODE_PRIVKEY)) {
1840         silc_server_create_channel_key(server, channel, 0);
1841
1842         /* Send to the channel */
1843         silc_server_send_channel_key(server, sock, channel, FALSE);
1844         id = silc_id_id2str(channel->id, SILC_ID_CHANNEL);
1845         id_len = SILC_ID_CHANNEL_LEN;
1846
1847         /* Send to the server */
1848         chk = silc_channel_key_payload_encode(id_len, id,
1849                                               strlen(channel->channel_key->
1850                                                      cipher->name),
1851                                               channel->channel_key->
1852                                               cipher->name,
1853                                               channel->key_len / 8,
1854                                               channel->key);
1855         silc_server_packet_send(server, sock, SILC_PACKET_CHANNEL_KEY, 0,
1856                                 chk->data, chk->len, FALSE);
1857         silc_buffer_free(chk);
1858         silc_free(id);
1859       }
1860
1861       silc_free(channel_id);
1862
1863       /* Since the channel is coming from server and we also know about it
1864          then send the JOIN notify to the server so that it see's our
1865          users on the channel "joining" the channel. */
1866       silc_server_announce_get_channel_users(server, channel, &users,
1867                                              &users_modes);
1868       if (users) {
1869         silc_buffer_push(users, users->data - users->head);
1870         silc_server_packet_send(server, sock,
1871                                 SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
1872                                 users->data, users->len, FALSE);
1873         silc_buffer_free(users);
1874       }
1875       if (users_modes) {
1876         silc_buffer_push(users_modes, users_modes->data - users_modes->head);
1877         silc_server_packet_send(server, sock,
1878                                 SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
1879                                 users_modes->data, users_modes->len, FALSE);
1880         silc_buffer_free(users_modes);
1881       }
1882     }
1883   }
1884
1885   silc_channel_payload_free(payload);
1886 }
1887
1888 /* Received New Channel List packet, list of New Channel List payloads inside
1889    one packet. Process the New Channel payloads one by one. */
1890
1891 void silc_server_new_channel_list(SilcServer server,
1892                                   SilcSocketConnection sock,
1893                                   SilcPacketContext *packet)
1894 {
1895   SilcPacketContext *new;
1896   SilcBuffer buffer;
1897   uint16 len1, len2;
1898
1899   SILC_LOG_DEBUG(("Processing New Channel List"));
1900
1901   if (sock->type == SILC_SOCKET_TYPE_CLIENT ||
1902       packet->src_id_type != SILC_ID_SERVER ||
1903       server->server_type == SILC_SERVER)
1904     return;
1905
1906   /* If the sender of this packet is server and we are router we need to
1907      broadcast this packet to other routers in the network. Broadcast
1908      this list packet instead of multiple New Channel packets. */
1909   if (!server->standalone && server->server_type == SILC_ROUTER &&
1910       sock->type == SILC_SOCKET_TYPE_SERVER &&
1911       !(packet->flags & SILC_PACKET_FLAG_BROADCAST)) {
1912     SILC_LOG_DEBUG(("Broadcasting received New Channel List packet"));
1913     silc_server_packet_send(server, server->router->connection,
1914                             packet->type,
1915                             packet->flags | SILC_PACKET_FLAG_BROADCAST,
1916                             packet->buffer->data, packet->buffer->len, FALSE);
1917   }
1918
1919   /* Make copy of the original packet context, except for the actual
1920      data buffer, which we will here now fetch from the original buffer. */
1921   new = silc_packet_context_alloc();
1922   new->type = SILC_PACKET_NEW_CHANNEL;
1923   new->flags = packet->flags;
1924   new->src_id = packet->src_id;
1925   new->src_id_len = packet->src_id_len;
1926   new->src_id_type = packet->src_id_type;
1927   new->dst_id = packet->dst_id;
1928   new->dst_id_len = packet->dst_id_len;
1929   new->dst_id_type = packet->dst_id_type;
1930
1931   buffer = silc_buffer_alloc(512);
1932   new->buffer = buffer;
1933
1934   while (packet->buffer->len) {
1935     SILC_GET16_MSB(len1, packet->buffer->data);
1936     if ((len1 > packet->buffer->len) ||
1937         (len1 > buffer->truelen))
1938       break;
1939
1940     SILC_GET16_MSB(len2, packet->buffer->data + 2 + len1);
1941     if ((len2 > packet->buffer->len) ||
1942         (len2 > buffer->truelen))
1943       break;
1944
1945     silc_buffer_pull_tail(buffer, 8 + len1 + len2);
1946     silc_buffer_put(buffer, packet->buffer->data, 8 + len1 + len2);
1947
1948     /* Process the New Channel */
1949     silc_server_new_channel(server, sock, new);
1950
1951     silc_buffer_push_tail(buffer, 8 + len1 + len2);
1952     silc_buffer_pull(packet->buffer, 8 + len1 + len2);
1953   }
1954
1955   silc_buffer_free(buffer);
1956   silc_free(new);
1957 }
1958
1959 /* Received key agreement packet. This packet is never for us. It is to
1960    the client in the packet's destination ID. Sending of this sort of packet
1961    equals sending private message, ie. it is sent point to point from
1962    one client to another. */
1963
1964 void silc_server_key_agreement(SilcServer server,
1965                                SilcSocketConnection sock,
1966                                SilcPacketContext *packet)
1967 {
1968   SilcSocketConnection dst_sock;
1969   SilcIDListData idata;
1970
1971   SILC_LOG_DEBUG(("Start"));
1972
1973   if (packet->src_id_type != SILC_ID_CLIENT ||
1974       packet->dst_id_type != SILC_ID_CLIENT)
1975     return;
1976
1977   if (!packet->dst_id)
1978     return;
1979
1980   /* Get the route to the client */
1981   dst_sock = silc_server_get_client_route(server, packet->dst_id,
1982                                           packet->dst_id_len, NULL, &idata);
1983   if (!dst_sock)
1984     return;
1985
1986   /* Relay the packet */
1987   silc_server_relay_packet(server, dst_sock, idata->send_key,
1988                            idata->hmac_send, packet, FALSE);
1989 }
1990
1991 /* Received connection auth request packet that is used during connection
1992    phase to resolve the mandatory authentication method.  This packet can
1993    actually be received at anytime but usually it is used only during
1994    the connection authentication phase. Now, protocol says that this packet
1995    can come from client or server, however, we support only this coming
1996    from client and expect that server's always knows what authentication
1997    method to use. */
1998
1999 void silc_server_connection_auth_request(SilcServer server,
2000                                          SilcSocketConnection sock,
2001                                          SilcPacketContext *packet)
2002 {
2003   SilcServerConfigSectionClientConnection *client = NULL;
2004   uint16 conn_type;
2005   int ret;
2006   SilcAuthMethod auth_meth;
2007
2008   SILC_LOG_DEBUG(("Start"));
2009
2010   if (packet->src_id_type && packet->src_id_type != SILC_ID_CLIENT)
2011     return;
2012
2013   /* Parse the payload */
2014   ret = silc_buffer_unformat(packet->buffer,
2015                              SILC_STR_UI_SHORT(&conn_type),
2016                              SILC_STR_UI_SHORT(NULL),
2017                              SILC_STR_END);
2018   if (ret == -1)
2019     return;
2020
2021   if (conn_type != SILC_SOCKET_TYPE_CLIENT)
2022     return;
2023
2024   /* Get the authentication method for the client */
2025   auth_meth = SILC_AUTH_NONE;
2026   client = silc_server_config_find_client_conn(server->config,
2027                                                sock->ip,
2028                                                sock->port);
2029   if (!client)
2030     client = silc_server_config_find_client_conn(server->config,
2031                                                  sock->hostname,
2032                                                  sock->port);
2033   if (client)
2034     auth_meth = client->auth_meth;
2035
2036   /* Send it back to the client */
2037   silc_server_send_connection_auth_request(server, sock,
2038                                            conn_type,
2039                                            auth_meth);
2040 }
2041
2042 /* Received REKEY packet. The sender of the packet wants to regenerate
2043    its session keys. This starts the REKEY protocol. */
2044
2045 void silc_server_rekey(SilcServer server,
2046                        SilcSocketConnection sock,
2047                        SilcPacketContext *packet)
2048 {
2049   SilcProtocol protocol;
2050   SilcServerRekeyInternalContext *proto_ctx;
2051   SilcIDListData idata = (SilcIDListData)sock->user_data;
2052
2053   SILC_LOG_DEBUG(("Start"));
2054
2055   /* Allocate internal protocol context. This is sent as context
2056      to the protocol. */
2057   proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
2058   proto_ctx->server = (void *)server;
2059   proto_ctx->sock = sock;
2060   proto_ctx->responder = TRUE;
2061   proto_ctx->pfs = idata->rekey->pfs;
2062
2063   /* Perform rekey protocol. Will call the final callback after the
2064      protocol is over. */
2065   silc_protocol_alloc(SILC_PROTOCOL_SERVER_REKEY,
2066                       &protocol, proto_ctx, silc_server_rekey_final);
2067   sock->protocol = protocol;
2068
2069   if (proto_ctx->pfs == FALSE)
2070     /* Run the protocol */
2071     protocol->execute(server->timeout_queue, 0, protocol, sock->sock, 0, 0);
2072 }