apps/silcd/packet_send.c

   1 /*
   2
   3   packet_send.c
   4
   5   Author: Pekka Riikonen <priikone@silcnet.org>
   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 send packets.
  22  */
  23 /* $Id$ */
  24
  25 #include "serverincludes.h"
  26 #include "server_internal.h"
  27
  28 /* Routine that sends packet or marks packet to be sent. This is used
  29    directly only in special cases. Normal cases should use
  30    silc_server_packet_send. Returns < 0 error. */
  31
  32 int silc_server_packet_send_real(SilcServer server,
  33                                  SilcSocketConnection sock,
  34                                  bool force_send)
  35 {
  36   int ret;
  37
  38   /* If disconnecting, ignore the data */
  39   if (SILC_IS_DISCONNECTING(sock))
  40     return -1;
  41
  42   /* If rekey protocol is active we must assure that all packets are
  43      sent through packet queue. */
  44   if (SILC_SERVER_IS_REKEY(sock))
  45     force_send = FALSE;
  46
  47   /* If outbound data is already pending do not force send */
  48   if (SILC_IS_OUTBUF_PENDING(sock))
  49     force_send = FALSE;
  50
  51   /* Send the packet */
  52   ret = silc_packet_send(sock, force_send);
  53   if (ret != -2)
  54     return ret;
  55
  56   /* Mark that there is some outgoing data available for this connection.
  57      This call sets the connection both for input and output (the input
  58      is set always and this call keeps the input setting, actually).
  59      Actual data sending is performed by silc_server_packet_process. */
  60   SILC_SET_CONNECTION_FOR_OUTPUT(server->schedule, sock->sock);
  61
  62   /* Mark to socket that data is pending in outgoing buffer. This flag
  63      is needed if new data is added to the buffer before the earlier
  64      put data is sent to the network. */
  65   SILC_SET_OUTBUF_PENDING(sock);
  66
  67   return 0;
  68 }
  69
  70 /* Assembles a new packet to be sent out to network. This doesn't actually
  71    send the packet but creates the packet and fills the outgoing data
  72    buffer and marks the packet ready to be sent to network. However, If
  73    argument force_send is TRUE the packet is sent immediately and not put
  74    to queue. Normal case is that the packet is not sent immediately. */
  75
  76 void silc_server_packet_send(SilcServer server,
  77                              SilcSocketConnection sock,
  78                              SilcPacketType type,
  79                              SilcPacketFlags flags,
  80                              unsigned char *data,
  81                              uint32 data_len,
  82                              bool force_send)
  83 {
  84   void *dst_id = NULL;
  85   SilcIdType dst_id_type = SILC_ID_NONE;
  86   SilcIDListData idata = (SilcIDListData)sock->user_data;
  87
  88   if (!sock)
  89     return;
  90
  91   /* If disconnecting, ignore the data */
  92   if (SILC_IS_DISCONNECTING(sock))
  93     return;
  94
  95   /* If entry is disabled do not sent anything. */
  96   if (idata && idata->status & SILC_IDLIST_STATUS_DISABLED)
  97     return;
  98
  99   /* Get data used in the packet sending, keys and stuff */
 100   switch(sock->type) {
 101   case SILC_SOCKET_TYPE_CLIENT:
 102     if (sock->user_data) {
 103       dst_id = ((SilcClientEntry)sock->user_data)->id;
 104       dst_id_type = SILC_ID_CLIENT;
 105     }
 106     break;
 107   case SILC_SOCKET_TYPE_SERVER:
 108   case SILC_SOCKET_TYPE_ROUTER:
 109     if (sock->user_data) {
 110       dst_id = ((SilcServerEntry)sock->user_data)->id;
 111       dst_id_type = SILC_ID_SERVER;
 112     }
 113     break;
 114   default:
 115     break;
 116   }
 117
 118   silc_server_packet_send_dest(server, sock, type, flags, dst_id,
 119                                dst_id_type, data, data_len, force_send);
 120 }
 121
 122 /* Assembles a new packet to be sent out to network. This doesn't actually
 123    send the packet but creates the packet and fills the outgoing data
 124    buffer and marks the packet ready to be sent to network. However, If
 125    argument force_send is TRUE the packet is sent immediately and not put
 126    to queue. Normal case is that the packet is not sent immediately.
 127    Destination information is sent as argument for this function. */
 128
 129 void silc_server_packet_send_dest(SilcServer server,
 130                                   SilcSocketConnection sock,
 131                                   SilcPacketType type,
 132                                   SilcPacketFlags flags,
 133                                   void *dst_id,
 134                                   SilcIdType dst_id_type,
 135                                   unsigned char *data,
 136                                   uint32 data_len,
 137                                   bool force_send)
 138 {
 139   SilcPacketContext packetdata;
 140   SilcIDListData idata = (SilcIDListData)sock->user_data;
 141   SilcCipher cipher = NULL;
 142   SilcHmac hmac = NULL;
 143   uint32 sequence = 0;
 144   unsigned char *dst_id_data = NULL;
 145   uint32 dst_id_len = 0;
 146   int block_len = 0;
 147
 148   /* If disconnecting, ignore the data */
 149   if (SILC_IS_DISCONNECTING(sock))
 150     return;
 151
 152   /* If entry is disabled do not sent anything. */
 153   if (idata && idata->status & SILC_IDLIST_STATUS_DISABLED)
 154     return;
 155
 156   SILC_LOG_DEBUG(("Sending packet, type %d", type));
 157
 158   if (dst_id) {
 159     dst_id_data = silc_id_id2str(dst_id, dst_id_type);
 160     dst_id_len = silc_id_get_len(dst_id, dst_id_type);
 161   }
 162
 163   if (idata) {
 164     cipher = idata->send_key;
 165     hmac = idata->hmac_send;
 166     sequence = idata->psn_send++;
 167     block_len = silc_cipher_get_block_len(cipher);
 168   }
 169
 170   /* Set the packet context pointers */
 171   packetdata.type = type;
 172   packetdata.flags = flags;
 173   packetdata.src_id = silc_id_id2str(server->id, server->id_type);
 174   packetdata.src_id_len = silc_id_get_len(server->id, server->id_type);
 175   packetdata.src_id_type = server->id_type;
 176   packetdata.dst_id = dst_id_data;
 177   packetdata.dst_id_len = dst_id_len;
 178   packetdata.dst_id_type = dst_id_type;
 179   packetdata.truelen = data_len + SILC_PACKET_HEADER_LEN +
 180     packetdata.src_id_len + dst_id_len;
 181   packetdata.padlen = SILC_PACKET_PADLEN(packetdata.truelen, block_len);
 182
 183   /* Prepare outgoing data buffer for packet sending */
 184   silc_packet_send_prepare(sock,
 185                            SILC_PACKET_HEADER_LEN +
 186                            packetdata.src_id_len +
 187                            packetdata.dst_id_len,
 188                            packetdata.padlen,
 189                            data_len);
 190
 191   SILC_LOG_DEBUG(("Putting data to outgoing buffer, len %d", data_len));
 192
 193   packetdata.buffer = sock->outbuf;
 194
 195   /* Put the data to the buffer */
 196   if (data && data_len)
 197     silc_buffer_put(sock->outbuf, data, data_len);
 198
 199   /* Create the outgoing packet */
 200   silc_packet_assemble(&packetdata, cipher);
 201
 202   /* Encrypt the packet */
 203   silc_packet_encrypt(cipher, hmac, sequence, sock->outbuf, sock->outbuf->len);
 204
 205   SILC_LOG_HEXDUMP(("Outgoing packet (%d), len %d", sequence,
 206                     sock->outbuf->len),
 207                    sock->outbuf->data, sock->outbuf->len);
 208
 209   /* Now actually send the packet */
 210   silc_server_packet_send_real(server, sock, force_send);
 211
 212   if (packetdata.src_id)
 213     silc_free(packetdata.src_id);
 214   if (packetdata.dst_id)
 215     silc_free(packetdata.dst_id);
 216 }
 217
 218 /* Assembles a new packet to be sent out to network. This doesn't actually
 219    send the packet but creates the packet and fills the outgoing data
 220    buffer and marks the packet ready to be sent to network. However, If
 221    argument force_send is TRUE the packet is sent immediately and not put
 222    to queue. Normal case is that the packet is not sent immediately.
 223    The source and destination information is sent as argument for this
 224    function. */
 225
 226 void silc_server_packet_send_srcdest(SilcServer server,
 227                                      SilcSocketConnection sock,
 228                                      SilcPacketType type,
 229                                      SilcPacketFlags flags,
 230                                      void *src_id,
 231                                      SilcIdType src_id_type,
 232                                      void *dst_id,
 233                                      SilcIdType dst_id_type,
 234                                      unsigned char *data,
 235                                      uint32 data_len,
 236                                      bool force_send)
 237 {
 238   SilcPacketContext packetdata;
 239   SilcIDListData idata;
 240   SilcCipher cipher = NULL;
 241   SilcHmac hmac = NULL;
 242   uint32 sequence = 0;
 243   unsigned char *dst_id_data = NULL;
 244   uint32 dst_id_len = 0;
 245   unsigned char *src_id_data = NULL;
 246   uint32 src_id_len = 0;
 247   int block_len = 0;
 248
 249   SILC_LOG_DEBUG(("Sending packet, type %d", type));
 250
 251   /* Get data used in the packet sending, keys and stuff */
 252   idata = (SilcIDListData)sock->user_data;
 253
 254   if (dst_id) {
 255     dst_id_data = silc_id_id2str(dst_id, dst_id_type);
 256     dst_id_len = silc_id_get_len(dst_id, dst_id_type);
 257   }
 258
 259   if (src_id) {
 260     src_id_data = silc_id_id2str(src_id, src_id_type);
 261     src_id_len = silc_id_get_len(src_id, src_id_type);
 262   }
 263
 264   if (idata) {
 265     cipher = idata->send_key;
 266     hmac = idata->hmac_send;
 267     sequence = idata->psn_send++;
 268     block_len = silc_cipher_get_block_len(cipher);
 269   }
 270
 271   /* Set the packet context pointers */
 272   packetdata.type = type;
 273   packetdata.flags = flags;
 274   packetdata.src_id = src_id_data;
 275   packetdata.src_id_len = src_id_len;
 276   packetdata.src_id_type = src_id_type;
 277   packetdata.dst_id = dst_id_data;
 278   packetdata.dst_id_len = dst_id_len;
 279   packetdata.dst_id_type = dst_id_type;
 280   packetdata.truelen = data_len + SILC_PACKET_HEADER_LEN +
 281     packetdata.src_id_len + dst_id_len;
 282   packetdata.padlen = SILC_PACKET_PADLEN(packetdata.truelen, block_len);
 283
 284   /* Prepare outgoing data buffer for packet sending */
 285   silc_packet_send_prepare(sock,
 286                            SILC_PACKET_HEADER_LEN +
 287                            packetdata.src_id_len +
 288                            packetdata.dst_id_len,
 289                            packetdata.padlen,
 290                            data_len);
 291
 292   SILC_LOG_DEBUG(("Putting data to outgoing buffer, len %d", data_len));
 293
 294   packetdata.buffer = sock->outbuf;
 295
 296   /* Put the data to the buffer */
 297   if (data && data_len)
 298     silc_buffer_put(sock->outbuf, data, data_len);
 299
 300   /* Create the outgoing packet */
 301   silc_packet_assemble(&packetdata, cipher);
 302
 303   /* Encrypt the packet */
 304   silc_packet_encrypt(cipher, hmac, sequence, sock->outbuf, sock->outbuf->len);
 305
 306   SILC_LOG_HEXDUMP(("Outgoing packet (%d), len %d", sequence,
 307                     sock->outbuf->len),
 308                    sock->outbuf->data, sock->outbuf->len);
 309
 310   /* Now actually send the packet */
 311   silc_server_packet_send_real(server, sock, force_send);
 312
 313   if (packetdata.src_id)
 314     silc_free(packetdata.src_id);
 315   if (packetdata.dst_id)
 316     silc_free(packetdata.dst_id);
 317 }
 318
 319 /* Broadcast received packet to our primary route. This function is used
 320    by router to further route received broadcast packet. It is expected
 321    that the broadcast flag from the packet is checked before calling this
 322    function. This does not test or set the broadcast flag. */
 323
 324 void silc_server_packet_broadcast(SilcServer server,
 325                                   SilcSocketConnection sock,
 326                                   SilcPacketContext *packet)
 327 {
 328   SilcBuffer buffer = packet->buffer;
 329   SilcIDListData idata;
 330   void *id;
 331
 332   SILC_LOG_DEBUG(("Broadcasting received broadcast packet"));
 333
 334   /* If the packet is originated from our primary route we are
 335      not allowed to send the packet. */
 336   id = silc_id_str2id(packet->src_id, packet->src_id_len, packet->src_id_type);
 337   if (id && !SILC_ID_SERVER_COMPARE(id, server->router->id)) {
 338     idata = (SilcIDListData)sock->user_data;
 339
 340     silc_buffer_push(buffer, buffer->data - buffer->head);
 341     silc_packet_send_prepare(sock, 0, 0, buffer->len);
 342     silc_buffer_put(sock->outbuf, buffer->data, buffer->len);
 343     silc_packet_encrypt(idata->send_key, idata->hmac_send, idata->psn_send++,
 344                         sock->outbuf, sock->outbuf->len);
 345
 346     SILC_LOG_HEXDUMP(("Broadcasted packet (%d), len %d", idata->psn_send - 1,
 347                       sock->outbuf->len),
 348                      sock->outbuf->data, sock->outbuf->len);
 349
 350     /* Now actually send the packet */
 351     silc_server_packet_send_real(server, sock, TRUE);
 352     silc_free(id);
 353     return;
 354   }
 355
 356   SILC_LOG_DEBUG(("Will not broadcast to primary route since it is the "
 357                   "original sender of this packet"));
 358   silc_free(id);
 359 }
 360
 361 /* Routes received packet to `sock'. This is used to route the packets that
 362    router receives but are not destined to it. */
 363
 364 void silc_server_packet_route(SilcServer server,
 365                               SilcSocketConnection sock,
 366                               SilcPacketContext *packet)
 367 {
 368   SilcBuffer buffer = packet->buffer;
 369   SilcIDListData idata;
 370
 371   SILC_LOG_DEBUG(("Routing received packet"));
 372
 373   idata = (SilcIDListData)sock->user_data;
 374
 375   silc_buffer_push(buffer, buffer->data - buffer->head);
 376   silc_packet_send_prepare(sock, 0, 0, buffer->len);
 377   silc_buffer_put(sock->outbuf, buffer->data, buffer->len);
 378   silc_packet_encrypt(idata->send_key, idata->hmac_send, idata->psn_send++,
 379                       sock->outbuf, sock->outbuf->len);
 380
 381   SILC_LOG_HEXDUMP(("Routed packet (%d), len %d", idata->psn_send - 1,
 382                     sock->outbuf->len),
 383                    sock->outbuf->data, sock->outbuf->len);
 384
 385   /* Now actually send the packet */
 386   silc_server_packet_send_real(server, sock, TRUE);
 387 }
 388
 389 /* This routine can be used to send a packet to table of clients provided
 390    in `clients'. If `route' is FALSE the packet is routed only to local
 391    clients (for server locally connected, and for router local cell). */
 392
 393 void silc_server_packet_send_clients(SilcServer server,
 394                                      SilcClientEntry *clients,
 395                                      uint32 clients_count,
 396                                      SilcPacketType type,
 397                                      SilcPacketFlags flags,
 398                                      bool route,
 399                                      unsigned char *data,
 400                                      uint32 data_len,
 401                                      bool force_send)
 402 {
 403   SilcSocketConnection sock = NULL;
 404   SilcClientEntry client = NULL;
 405   SilcServerEntry *routed = NULL;
 406   uint32 routed_count = 0;
 407   bool gone = FALSE;
 408   int i, k;
 409
 410   SILC_LOG_DEBUG(("Sending packet to list of clients"));
 411
 412   /* Send to all clients in table */
 413   for (i = 0; i < clients_count; i++) {
 414     client = clients[i];
 415
 416     /* If client has router set it is not locally connected client and
 417        we will route the message to the router set in the client. Though,
 418        send locally connected server in all cases. */
 419     if (server->server_type == SILC_ROUTER && client->router &&
 420         ((!route && client->router->router == server->id_entry) || route)) {
 421
 422       /* Check if we have sent the packet to this route already */
 423       for (k = 0; k < routed_count; k++)
 424         if (routed[k] == client->router)
 425           break;
 426       if (k < routed_count)
 427         continue;
 428
 429       /* Route only once to router */
 430       sock = (SilcSocketConnection)client->router->connection;
 431       if (sock->type == SILC_SOCKET_TYPE_ROUTER) {
 432         if (gone)
 433           continue;
 434         gone = TRUE;
 435       }
 436
 437       /* Send the packet */
 438       silc_server_packet_send_dest(server, sock, type, flags,
 439                                    client->router->id, SILC_ID_SERVER,
 440                                    data, data_len, force_send);
 441
 442       /* Mark this route routed already */
 443       routed = silc_realloc(routed, sizeof(*routed) * (routed_count + 1));
 444       routed[routed_count++] = client->router;
 445       continue;
 446     }
 447
 448     if (client->router)
 449       continue;
 450
 451     /* Send to locally connected client */
 452     sock = (SilcSocketConnection)client->connection;
 453     silc_server_packet_send_dest(server, sock, type, flags,
 454                                  client->id, SILC_ID_CLIENT,
 455                                  data, data_len, force_send);
 456   }
 457
 458   silc_free(routed);
 459 }
 460
 461 /* Internal routine to actually create the channel packet and send it
 462    to network. This is common function in channel message sending. If
 463    `channel_message' is TRUE this encrypts the message as it is strictly
 464    a channel message. If FALSE normal encryption process is used. */
 465
 466 static void
 467 silc_server_packet_send_to_channel_real(SilcServer server,
 468                                         SilcSocketConnection sock,
 469                                         SilcPacketContext *packet,
 470                                         SilcCipher cipher,
 471                                         SilcHmac hmac,
 472                                         uint32 sequence,
 473                                         unsigned char *data,
 474                                         uint32 data_len,
 475                                         bool channel_message,
 476                                         bool force_send)
 477 {
 478   int block_len;
 479
 480   if (!sock)
 481     return;
 482
 483   packet->truelen = data_len + SILC_PACKET_HEADER_LEN +
 484     packet->src_id_len + packet->dst_id_len;
 485
 486   block_len = cipher ? silc_cipher_get_block_len(cipher) : 0;
 487   if (channel_message)
 488     packet->padlen = SILC_PACKET_PADLEN((SILC_PACKET_HEADER_LEN +
 489                                          packet->src_id_len +
 490                                          packet->dst_id_len), block_len);
 491   else
 492     packet->padlen = SILC_PACKET_PADLEN(packet->truelen, block_len);
 493
 494   /* Prepare outgoing data buffer for packet sending */
 495   silc_packet_send_prepare(sock,
 496                            SILC_PACKET_HEADER_LEN +
 497                            packet->src_id_len +
 498                            packet->dst_id_len,
 499                            packet->padlen,
 500                            data_len);
 501
 502   packet->buffer = sock->outbuf;
 503
 504   /* Put the data to buffer, assemble and encrypt the packet. The packet
 505      is encrypted with normal session key shared with the client, unless
 506      the `channel_message' is TRUE. */
 507   silc_buffer_put(sock->outbuf, data, data_len);
 508   silc_packet_assemble(packet, cipher);
 509   if (channel_message)
 510     silc_packet_encrypt(cipher, hmac, sequence, sock->outbuf,
 511                         SILC_PACKET_HEADER_LEN + packet->src_id_len +
 512                         packet->dst_id_len + packet->padlen);
 513   else
 514     silc_packet_encrypt(cipher, hmac, sequence, sock->outbuf,
 515                         sock->outbuf->len);
 516
 517   SILC_LOG_HEXDUMP(("Channel packet (%d), len %d", sequence,
 518                     sock->outbuf->len),
 519                    sock->outbuf->data, sock->outbuf->len);
 520
 521   /* Now actually send the packet */
 522   silc_server_packet_send_real(server, sock, force_send);
 523 }
 524
 525 /* This routine is used by the server to send packets to channel. The
 526    packet sent with this function is distributed to all clients on
 527    the channel. Usually this is used to send notify messages to the
 528    channel, things like notify about new user joining to the channel.
 529    If `route' is FALSE then the packet is sent only locally and will not
 530    be routed anywhere (for router locally means cell wide). If `sender'
 531    is provided then the packet is not sent to that connection since it
 532    originally came from it. If `send_to_clients' is FALSE then the
 533    packet is not sent clients, only servers. */
 534
 535 void silc_server_packet_send_to_channel(SilcServer server,
 536                                         SilcSocketConnection sender,
 537                                         SilcChannelEntry channel,
 538                                         SilcPacketType type,
 539                                         bool route,
 540                                         unsigned char *data,
 541                                         uint32 data_len,
 542                                         bool force_send)
 543 {
 544   SilcSocketConnection sock = NULL;
 545   SilcPacketContext packetdata;
 546   SilcClientEntry client = NULL;
 547   SilcServerEntry *routed = NULL;
 548   SilcChannelClientEntry chl;
 549   SilcHashTableList htl;
 550   SilcIDListData idata;
 551   uint32 routed_count = 0;
 552   bool gone = FALSE;
 553   int k;
 554
 555   /* This doesn't send channel message packets */
 556   assert(type != SILC_PACKET_CHANNEL_MESSAGE);
 557
 558   SILC_LOG_DEBUG(("Sending packet to channel"));
 559
 560   /* Set the packet context pointers. */
 561   packetdata.flags = 0;
 562   packetdata.type = type;
 563   packetdata.src_id = silc_id_id2str(server->id, SILC_ID_SERVER);
 564   packetdata.src_id_len = silc_id_get_len(server->id, SILC_ID_SERVER);
 565   packetdata.src_id_type = SILC_ID_SERVER;
 566   packetdata.dst_id = silc_id_id2str(channel->id, SILC_ID_CHANNEL);
 567   packetdata.dst_id_len = silc_id_get_len(channel->id, SILC_ID_CHANNEL);
 568   packetdata.dst_id_type = SILC_ID_CHANNEL;
 569
 570   /* If there are global users in the channel we will send the message
 571      first to our router for further routing. */
 572   if (route && server->server_type != SILC_ROUTER && !server->standalone &&
 573       channel->global_users) {
 574     SilcServerEntry router;
 575
 576     /* Get data used in packet header encryption, keys and stuff. */
 577     router = server->router;
 578     sock = (SilcSocketConnection)router->connection;
 579     idata = (SilcIDListData)router;
 580
 581     if (sock != sender) {
 582       SILC_LOG_DEBUG(("Sending packet to router for routing"));
 583
 584       silc_server_packet_send_to_channel_real(server, sock, &packetdata,
 585                                               idata->send_key,
 586                                               idata->hmac_send,
 587                                               idata->psn_send++,
 588                                               data, data_len, FALSE,
 589                                               force_send);
 590     }
 591   }
 592
 593   routed = silc_calloc(silc_hash_table_count(channel->user_list),
 594                        sizeof(*routed));
 595
 596   /* Send the message to clients on the channel's client list. */
 597   silc_hash_table_list(channel->user_list, &htl);
 598   while (silc_hash_table_get(&htl, NULL, (void *)&chl)) {
 599     client = chl->client;
 600     if (!client)
 601       continue;
 602
 603     /* If client has router set it is not locally connected client and
 604        we will route the message to the router set in the client. Though,
 605        send locally connected server in all cases. */
 606     if (server->server_type == SILC_ROUTER && client->router &&
 607         ((!route && client->router->router == server->id_entry) || route)) {
 608
 609       /* Check if we have sent the packet to this route already */
 610       for (k = 0; k < routed_count; k++)
 611         if (routed[k] == client->router)
 612           break;
 613       if (k < routed_count)
 614         continue;
 615
 616       /* Get data used in packet header encryption, keys and stuff. */
 617       sock = (SilcSocketConnection)client->router->connection;
 618       idata = (SilcIDListData)client->router;
 619
 620       if (sender && sock == sender)
 621         continue;
 622
 623       /* Route only once to router */
 624       if (sock->type == SILC_SOCKET_TYPE_ROUTER) {
 625         if (gone)
 626           continue;
 627         gone = TRUE;
 628       }
 629
 630       /* Send the packet */
 631       silc_server_packet_send_to_channel_real(server, sock, &packetdata,
 632                                               idata->send_key,
 633                                               idata->hmac_send,
 634                                               idata->psn_send++,
 635                                               data, data_len, FALSE,
 636                                               force_send);
 637
 638       /* Mark this route routed already */
 639       routed[routed_count++] = client->router;
 640       continue;
 641     }
 642
 643     if (client->router)
 644       continue;
 645
 646     /* Send to locally connected client */
 647
 648     /* Get data used in packet header encryption, keys and stuff. */
 649     sock = (SilcSocketConnection)client->connection;
 650     idata = (SilcIDListData)client;
 651
 652     if (sender && sock == sender)
 653       continue;
 654
 655     /* Send the packet */
 656     silc_server_packet_send_to_channel_real(server, sock, &packetdata,
 657                                             idata->send_key,
 658                                             idata->hmac_send,
 659                                             idata->psn_send++,
 660                                             data, data_len, FALSE,
 661                                             force_send);
 662   }
 663
 664   silc_hash_table_list_reset(&htl);
 665   silc_free(routed);
 666   silc_free(packetdata.src_id);
 667   silc_free(packetdata.dst_id);
 668 }
 669
 670 /* This checks whether the relayed packet came from router. If it did
 671    then we'll need to encrypt it with the channel key. This is called
 672    from the silc_server_packet_relay_to_channel. */
 673
 674 static bool
 675 silc_server_packet_relay_to_channel_encrypt(SilcServer server,
 676                                             SilcSocketConnection sock,
 677                                             SilcChannelEntry channel,
 678                                             unsigned char *data,
 679                                             unsigned int data_len)
 680 {
 681   /* If we are router and the packet came from router and private key
 682      has not been set for the channel then we must encrypt the packet
 683      as it was decrypted with the session key shared between us and the
 684      router which sent it. This is so, because cells does not share the
 685      same channel key. */
 686   if (server->server_type == SILC_ROUTER &&
 687       sock->type == SILC_SOCKET_TYPE_ROUTER &&
 688       !(channel->mode & SILC_CHANNEL_MODE_PRIVKEY) &&
 689       channel->channel_key) {
 690     SilcBuffer chp;
 691     uint32 iv_len, i;
 692     uint16 dlen, flags;
 693
 694     iv_len = silc_cipher_get_block_len(channel->channel_key);
 695     if (channel->iv[0] == '\0')
 696       for (i = 0; i < iv_len; i++) channel->iv[i] =
 697                                      silc_rng_get_byte(server->rng);
 698     else
 699       silc_hash_make(server->md5hash, channel->iv, iv_len, channel->iv);
 700
 701     /* Encode new payload. This encrypts it also. */
 702     SILC_GET16_MSB(flags, data);
 703     SILC_GET16_MSB(dlen, data + 2);
 704
 705     if (dlen > data_len) {
 706       SILC_LOG_WARNING(("Corrupted channel message, cannot relay it"));
 707       return FALSE;
 708     }
 709
 710     chp = silc_channel_message_payload_encode(flags, dlen, data + 4,
 711                                               iv_len, channel->iv,
 712                                               channel->channel_key,
 713                                               channel->hmac);
 714     memcpy(data, chp->data, chp->len);
 715     silc_buffer_free(chp);
 716   }
 717
 718   return TRUE;
 719 }
 720
 721 /* This routine is explicitly used to relay messages to some channel.
 722    Packets sent with this function we have received earlier and are
 723    totally encrypted. This just sends the packet to all clients on
 724    the channel. If the sender of the packet is someone on the channel
 725    the message will not be sent to that client. The SILC Packet header
 726    is encrypted with the session key shared between us and the client.
 727    MAC is also computed before encrypting the header. Rest of the
 728    packet will be untouched. */
 729
 730 void silc_server_packet_relay_to_channel(SilcServer server,
 731                                          SilcSocketConnection sender_sock,
 732                                          SilcChannelEntry channel,
 733                                          void *sender,
 734                                          SilcIdType sender_type,
 735                                          void *sender_entry,
 736                                          unsigned char *data,
 737                                          uint32 data_len,
 738                                          bool force_send)
 739 {
 740   bool found = FALSE;
 741   SilcSocketConnection sock = NULL;
 742   SilcPacketContext packetdata;
 743   SilcClientEntry client = NULL;
 744   SilcServerEntry *routed = NULL;
 745   SilcChannelClientEntry chl;
 746   uint32 routed_count = 0;
 747   SilcIDListData idata;
 748   SilcHashTableList htl;
 749   bool gone = FALSE;
 750   int k;
 751
 752   SILC_LOG_DEBUG(("Relaying packet to channel"));
 753
 754   /* This encrypts the packet, if needed. It will be encrypted if
 755      it came from the router thus it needs to be encrypted with the
 756      channel key. If the channel key does not exist, then we know we
 757      don't have a single local user on the channel. */
 758   if (!silc_server_packet_relay_to_channel_encrypt(server, sender_sock,
 759                                                    channel, data,
 760                                                    data_len))
 761     return;
 762
 763   /* Set the packet context pointers. */
 764   packetdata.flags = 0;
 765   packetdata.type = SILC_PACKET_CHANNEL_MESSAGE;
 766   packetdata.src_id = silc_id_id2str(sender, sender_type);
 767   packetdata.src_id_len = silc_id_get_len(sender, sender_type);
 768   packetdata.src_id_type = sender_type;
 769   packetdata.dst_id = silc_id_id2str(channel->id, SILC_ID_CHANNEL);
 770   packetdata.dst_id_len = silc_id_get_len(channel->id, SILC_ID_CHANNEL);
 771   packetdata.dst_id_type = SILC_ID_CHANNEL;
 772
 773   /* If there are global users in the channel we will send the message
 774      first to our router for further routing. */
 775   if (server->server_type != SILC_ROUTER && !server->standalone &&
 776       channel->global_users) {
 777     SilcServerEntry router = server->router;
 778
 779     /* Check that the sender is not our router. */
 780     if (sender_sock != (SilcSocketConnection)router->connection) {
 781
 782       /* Get data used in packet header encryption, keys and stuff. */
 783       sock = (SilcSocketConnection)router->connection;
 784       idata = (SilcIDListData)router;
 785
 786       SILC_LOG_DEBUG(("Sending channel message to router for routing"));
 787
 788       silc_server_packet_send_to_channel_real(server, sock, &packetdata,
 789                                               idata->send_key,
 790                                               idata->hmac_send,
 791                                               idata->psn_send++,
 792                                               data, data_len, TRUE,
 793                                               force_send);
 794     }
 795   }
 796
 797   routed = silc_calloc(silc_hash_table_count(channel->user_list),
 798                        sizeof(*routed));
 799
 800   /* Mark that to the route the original sender if from is not routed */
 801   if (sender_type == SILC_ID_CLIENT) {
 802     client = (SilcClientEntry)sender_entry;
 803     if (client->router) {
 804       routed[routed_count++] = client->router;
 805       SILC_LOG_DEBUG(("************* router %s",
 806                       silc_id_render(client->router->id, SILC_ID_SERVER)));
 807     }
 808   }
 809
 810   /* Send the message to clients on the channel's client list. */
 811   silc_hash_table_list(channel->user_list, &htl);
 812   while (silc_hash_table_get(&htl, NULL, (void *)&chl)) {
 813     client = chl->client;
 814     if (!client)
 815       continue;
 816
 817     /* Do not send to the sender */
 818     if (!found && client == sender_entry) {
 819       found = TRUE;
 820       continue;
 821     }
 822
 823     /* If the client has set router it means that it is not locally
 824        connected client and we will route the packet further. */
 825     if (server->server_type == SILC_ROUTER && client->router) {
 826
 827       /* Sender maybe server as well so we want to make sure that
 828          we won't send the message to the server it came from. */
 829       if (!found && SILC_ID_SERVER_COMPARE(client->router->id, sender)) {
 830         found = TRUE;
 831         routed[routed_count++] = client->router;
 832         continue;
 833       }
 834
 835       /* Check if we have sent the packet to this route already */
 836       for (k = 0; k < routed_count; k++)
 837         if (routed[k] == client->router)
 838           break;
 839       if (k < routed_count)
 840         continue;
 841
 842       /* Get data used in packet header encryption, keys and stuff. */
 843       sock = (SilcSocketConnection)client->router->connection;
 844       idata = (SilcIDListData)client->router;
 845
 846       /* Do not send to the sender. Check first whether the true
 847          sender's router is same as this client's router. Also check
 848          if the sender socket is the same as this client's router
 849          socket. */
 850       if (sender_entry &&
 851           ((SilcClientEntry)sender_entry)->router == client->router)
 852         continue;
 853       if (sender_sock && sock == sender_sock)
 854         continue;
 855
 856       SILC_LOG_DEBUG(("Relaying packet to client ID(%s) %s (%s)",
 857                       silc_id_render(client->id, SILC_ID_CLIENT),
 858                       sock->hostname, sock->ip));
 859
 860       /* Mark this route routed already. */
 861       routed[routed_count++] = client->router;
 862
 863       /* If the remote connection is router then we'll decrypt the
 864          channel message and re-encrypt it with the session key shared
 865          between us and the remote router. This is done because the
 866          channel keys are cell specific and we have different channel
 867          key than the remote router has. */
 868       if (sock->type == SILC_SOCKET_TYPE_ROUTER) {
 869         if (gone)
 870           continue;
 871
 872         SILC_LOG_DEBUG(("Remote is router, encrypt with session key"));
 873         gone = TRUE;
 874
 875         /* If private key mode is not set then decrypt the packet
 876            and re-encrypt it */
 877         if (!(channel->mode & SILC_CHANNEL_MODE_PRIVKEY)) {
 878           unsigned char *tmp = silc_memdup(data, data_len);
 879
 880           /* Decrypt the channel message (we don't check the MAC) */
 881           if (channel->channel_key &&
 882               !silc_channel_message_payload_decrypt(tmp, data_len,
 883                                                     channel->channel_key,
 884                                                     NULL)) {
 885             memset(tmp, 0, data_len);
 886             silc_free(tmp);
 887             continue;
 888           }
 889
 890           /* Now re-encrypt and send it to the router */
 891           silc_server_packet_send_srcdest(server, sock,
 892                                           SILC_PACKET_CHANNEL_MESSAGE, 0,
 893                                           sender, sender_type,
 894                                           channel->id, SILC_ID_CHANNEL,
 895                                           tmp, data_len, force_send);
 896
 897           /* Free the copy of the channel message */
 898           memset(tmp, 0, data_len);
 899           silc_free(tmp);
 900         } else {
 901           /* Private key mode is set, we don't have the channel key, so
 902              just re-encrypt the entire packet and send it to the router. */
 903           silc_server_packet_send_srcdest(server, sock,
 904                                           SILC_PACKET_CHANNEL_MESSAGE, 0,
 905                                           sender, sender_type,
 906                                           channel->id, SILC_ID_CHANNEL,
 907                                           data, data_len, force_send);
 908         }
 909         continue;
 910       }
 911
 912       /* Send the packet (to normal server) */
 913       silc_server_packet_send_to_channel_real(server, sock, &packetdata,
 914                                               idata->send_key,
 915                                               idata->hmac_send,
 916                                               idata->psn_send++,
 917                                               data, data_len, TRUE,
 918                                               force_send);
 919
 920       continue;
 921     }
 922
 923     if (client->router)
 924       continue;
 925
 926     /* Get data used in packet header encryption, keys and stuff. */
 927     sock = (SilcSocketConnection)client->connection;
 928     idata = (SilcIDListData)client;
 929
 930     if (sender_sock && sock == sender_sock)
 931       continue;
 932
 933     SILC_LOG_DEBUG(("Sending packet to client ID(%s) %s (%s)",
 934                     silc_id_render(client->id, SILC_ID_CLIENT),
 935                     sock->hostname, sock->ip));
 936
 937     /* Send the packet */
 938     silc_server_packet_send_to_channel_real(server, sock, &packetdata,
 939                                             idata->send_key,
 940                                             idata->hmac_send,
 941                                             idata->psn_send++,
 942                                             data, data_len, TRUE,
 943                                             force_send);
 944   }
 945
 946   silc_hash_table_list_reset(&htl);
 947   silc_free(routed);
 948   silc_free(packetdata.src_id);
 949   silc_free(packetdata.dst_id);
 950 }
 951
 952 /* This function is used to send packets strictly to all local clients
 953    on a particular channel.  This is used for example to distribute new
 954    channel key to all our locally connected clients on the channel.
 955    The packets are always encrypted with the session key shared between
 956    the client, this means these are not _to the channel_ but _to the client_
 957    on the channel. */
 958
 959 void silc_server_packet_send_local_channel(SilcServer server,
 960                                            SilcChannelEntry channel,
 961                                            SilcPacketType type,
 962                                            SilcPacketFlags flags,
 963                                            unsigned char *data,
 964                                            uint32 data_len,
 965                                            bool force_send)
 966 {
 967   SilcChannelClientEntry chl;
 968   SilcHashTableList htl;
 969   SilcSocketConnection sock = NULL;
 970
 971   SILC_LOG_DEBUG(("Start"));
 972
 973   /* Send the message to clients on the channel's client list. */
 974   silc_hash_table_list(channel->user_list, &htl);
 975   while (silc_hash_table_get(&htl, NULL, (void *)&chl)) {
 976     if (chl->client && !chl->client->router) {
 977       sock = (SilcSocketConnection)chl->client->connection;
 978
 979       /* Send the packet to the client */
 980       silc_server_packet_send_dest(server, sock, type, flags, chl->client->id,
 981                                    SILC_ID_CLIENT, data, data_len,
 982                                    force_send);
 983     }
 984   }
 985   silc_hash_table_list_reset(&htl);
 986 }
 987
 988 /* Routine used to send (relay, route) private messages to some destination.
 989    If the private message key does not exist then the message is re-encrypted,
 990    otherwise we just pass it along. This really is not used to send new
 991    private messages (as server does not send them) but to relay received
 992    private messages. */
 993
 994 void silc_server_send_private_message(SilcServer server,
 995                                       SilcSocketConnection dst_sock,
 996                                       SilcCipher cipher,
 997                                       SilcHmac hmac,
 998                                       uint32 sequence,
 999                                       SilcPacketContext *packet)
1000 {
1001   SilcBuffer buffer = packet->buffer;
1002
1003   /* Re-encrypt and send if private messge key does not exist */
1004   if (!(packet->flags & SILC_PACKET_FLAG_PRIVMSG_KEY)) {
1005
1006     silc_buffer_push(buffer, SILC_PACKET_HEADER_LEN + packet->src_id_len
1007                      + packet->dst_id_len + packet->padlen);
1008     silc_packet_send_prepare(dst_sock, 0, 0, buffer->len);
1009     silc_buffer_put(dst_sock->outbuf, buffer->data, buffer->len);
1010
1011     /* Re-encrypt packet */
1012     silc_packet_encrypt(cipher, hmac, sequence, dst_sock->outbuf, buffer->len);
1013
1014     /* Send the packet */
1015     silc_server_packet_send_real(server, dst_sock, FALSE);
1016
1017   } else {
1018     /* Key exist so encrypt just header and send it */
1019     silc_buffer_push(buffer, SILC_PACKET_HEADER_LEN + packet->src_id_len
1020                      + packet->dst_id_len + packet->padlen);
1021     silc_packet_send_prepare(dst_sock, 0, 0, buffer->len);
1022     silc_buffer_put(dst_sock->outbuf, buffer->data, buffer->len);
1023
1024     /* Encrypt header */
1025     silc_packet_encrypt(cipher, hmac, sequence, dst_sock->outbuf,
1026                         SILC_PACKET_HEADER_LEN + packet->src_id_len +
1027                         packet->dst_id_len + packet->padlen);
1028
1029     silc_server_packet_send_real(server, dst_sock, FALSE);
1030   }
1031 }
1032
1033 /* Sends current motd to client */
1034
1035 void silc_server_send_motd(SilcServer server,
1036                            SilcSocketConnection sock)
1037 {
1038   char *motd, *motd_file = NULL;
1039   uint32 motd_len;
1040
1041   if (server->config)
1042     motd_file = server->config->server_info->motd_file;
1043
1044   if (motd_file) {
1045     motd = silc_file_readfile(motd_file, &motd_len);
1046     if (!motd)
1047       return;
1048
1049     silc_server_send_notify(server, sock, FALSE, SILC_NOTIFY_TYPE_MOTD, 1,
1050                             motd, motd_len);
1051     silc_free(motd);
1052   }
1053 }
1054
1055 /* Sends error message. Error messages may or may not have any
1056    implications. */
1057
1058 void silc_server_send_error(SilcServer server,
1059                             SilcSocketConnection sock,
1060                             const char *fmt, ...)
1061 {
1062   va_list ap;
1063   unsigned char buf[4096];
1064
1065   memset(buf, 0, sizeof(buf));
1066   va_start(ap, fmt);
1067   vsprintf(buf, fmt, ap);
1068   va_end(ap);
1069
1070   silc_server_packet_send(server, sock, SILC_PACKET_ERROR, 0,
1071                           buf, strlen(buf), FALSE);
1072 }
1073
1074 /* Sends notify message. If format is TRUE the variable arguments are
1075    formatted and the formatted string is sent as argument payload. If it is
1076    FALSE then each argument is sent as separate argument and their format
1077    in the argument list must be { argument data, argument length }. */
1078
1079 void silc_server_send_notify(SilcServer server,
1080                              SilcSocketConnection sock,
1081                              bool broadcast,
1082                              SilcNotifyType type,
1083                              uint32 argc, ...)
1084 {
1085   va_list ap;
1086   SilcBuffer packet;
1087
1088   va_start(ap, argc);
1089
1090   packet = silc_notify_payload_encode(type, argc, ap);
1091   silc_server_packet_send(server, sock, SILC_PACKET_NOTIFY,
1092                           broadcast ? SILC_PACKET_FLAG_BROADCAST : 0,
1093                           packet->data, packet->len, FALSE);
1094
1095   /* Send to backup routers if this is being broadcasted to primary
1096      router. */
1097   if (server->router && server->router->connection &&
1098       sock == server->router->connection && broadcast)
1099     silc_server_backup_send(server, NULL, SILC_PACKET_NOTIFY, 0,
1100                             packet->data, packet->len, FALSE, TRUE);
1101
1102   silc_buffer_free(packet);
1103   va_end(ap);
1104 }
1105
1106 /* Sends notify message and gets the arguments from the `args' Argument
1107    Payloads. */
1108
1109 void silc_server_send_notify_args(SilcServer server,
1110                                   SilcSocketConnection sock,
1111                                   bool broadcast,
1112                                   SilcNotifyType type,
1113                                   uint32 argc,
1114                                   SilcBuffer args)
1115 {
1116   SilcBuffer packet;
1117
1118   packet = silc_notify_payload_encode_args(type, argc, args);
1119   silc_server_packet_send(server, sock, SILC_PACKET_NOTIFY,
1120                           broadcast ? SILC_PACKET_FLAG_BROADCAST : 0,
1121                           packet->data, packet->len, FALSE);
1122   silc_buffer_free(packet);
1123 }
1124
1125 /* Send CHANNEL_CHANGE notify type. This tells the receiver to replace the
1126    `old_id' with the `new_id'. */
1127
1128 void silc_server_send_notify_channel_change(SilcServer server,
1129                                             SilcSocketConnection sock,
1130                                             bool broadcast,
1131                                             SilcChannelID *old_id,
1132                                             SilcChannelID *new_id)
1133 {
1134   SilcBuffer idp1, idp2;
1135
1136   idp1 = silc_id_payload_encode((void *)old_id, SILC_ID_CHANNEL);
1137   idp2 = silc_id_payload_encode((void *)new_id, SILC_ID_CHANNEL);
1138
1139   silc_server_send_notify(server, sock, broadcast,
1140                           SILC_NOTIFY_TYPE_CHANNEL_CHANGE,
1141                           2, idp1->data, idp1->len, idp2->data, idp2->len);
1142   silc_buffer_free(idp1);
1143   silc_buffer_free(idp2);
1144 }
1145
1146 /* Send NICK_CHANGE notify type. This tells the receiver to replace the
1147    `old_id' with the `new_id'. */
1148
1149 void silc_server_send_notify_nick_change(SilcServer server,
1150                                          SilcSocketConnection sock,
1151                                          bool broadcast,
1152                                          SilcClientID *old_id,
1153                                          SilcClientID *new_id)
1154 {
1155   SilcBuffer idp1, idp2;
1156
1157   idp1 = silc_id_payload_encode((void *)old_id, SILC_ID_CLIENT);
1158   idp2 = silc_id_payload_encode((void *)new_id, SILC_ID_CLIENT);
1159
1160   silc_server_send_notify(server, sock, broadcast,
1161                           SILC_NOTIFY_TYPE_NICK_CHANGE,
1162                           2, idp1->data, idp1->len, idp2->data, idp2->len);
1163   silc_buffer_free(idp1);
1164   silc_buffer_free(idp2);
1165 }
1166
1167 /* Sends JOIN notify type. This tells that new client by `client_id' ID
1168    has joined to the `channel'. */
1169
1170 void silc_server_send_notify_join(SilcServer server,
1171                                   SilcSocketConnection sock,
1172                                   bool broadcast,
1173                                   SilcChannelEntry channel,
1174                                   SilcClientID *client_id)
1175 {
1176   SilcBuffer idp1, idp2;
1177
1178   idp1 = silc_id_payload_encode((void *)client_id, SILC_ID_CLIENT);
1179   idp2 = silc_id_payload_encode((void *)channel->id, SILC_ID_CHANNEL);
1180   silc_server_send_notify(server, sock, broadcast, SILC_NOTIFY_TYPE_JOIN,
1181                           2, idp1->data, idp1->len,
1182                           idp2->data, idp2->len);
1183   silc_buffer_free(idp1);
1184   silc_buffer_free(idp2);
1185 }
1186
1187 /* Sends LEAVE notify type. This tells that `client_id' has left the
1188    `channel'. The Notify packet is always destined to the channel. */
1189
1190 void silc_server_send_notify_leave(SilcServer server,
1191                                    SilcSocketConnection sock,
1192                                    bool broadcast,
1193                                    SilcChannelEntry channel,
1194                                    SilcClientID *client_id)
1195 {
1196   SilcBuffer idp;
1197
1198   idp = silc_id_payload_encode((void *)client_id, SILC_ID_CLIENT);
1199   silc_server_send_notify_dest(server, sock, broadcast, (void *)channel->id,
1200                                SILC_ID_CHANNEL, SILC_NOTIFY_TYPE_LEAVE,
1201                                1, idp->data, idp->len);
1202   silc_buffer_free(idp);
1203 }
1204
1205 /* Sends CMODE_CHANGE notify type. This tells that `client_id' changed the
1206    `channel' mode to `mode. The Notify packet is always destined to
1207    the channel. */
1208
1209 void silc_server_send_notify_cmode(SilcServer server,
1210                                    SilcSocketConnection sock,
1211                                    bool broadcast,
1212                                    SilcChannelEntry channel,
1213                                    uint32 mode_mask,
1214                                    void *id, SilcIdType id_type,
1215                                    char *cipher, char *hmac,
1216                                    char *passphrase)
1217 {
1218   SilcBuffer idp;
1219   unsigned char mode[4];
1220
1221   idp = silc_id_payload_encode((void *)id, id_type);
1222   SILC_PUT32_MSB(mode_mask, mode);
1223
1224   silc_server_send_notify_dest(server, sock, broadcast, (void *)channel->id,
1225                                SILC_ID_CHANNEL, SILC_NOTIFY_TYPE_CMODE_CHANGE,
1226                                5, idp->data, idp->len,
1227                                mode, 4,
1228                                cipher, cipher ? strlen(cipher) : 0,
1229                                hmac, hmac ? strlen(hmac) : 0,
1230                                passphrase, passphrase ?
1231                                strlen(passphrase) : 0);
1232   silc_buffer_free(idp);
1233 }
1234
1235 /* Sends CUMODE_CHANGE notify type. This tells that `client_id' changed the
1236    `target' client's mode on `channel'. The notify packet is always
1237    destined to the channel. */
1238
1239 void silc_server_send_notify_cumode(SilcServer server,
1240                                     SilcSocketConnection sock,
1241                                     bool broadcast,
1242                                     SilcChannelEntry channel,
1243                                     uint32 mode_mask,
1244                                     void *id, SilcIdType id_type,
1245                                     SilcClientID *target)
1246 {
1247   SilcBuffer idp1, idp2;
1248   unsigned char mode[4];
1249
1250   idp1 = silc_id_payload_encode((void *)id, id_type);
1251   idp2 = silc_id_payload_encode((void *)target, SILC_ID_CLIENT);
1252   SILC_PUT32_MSB(mode_mask, mode);
1253
1254   silc_server_send_notify_dest(server, sock, broadcast, (void *)channel->id,
1255                                SILC_ID_CHANNEL,
1256                                SILC_NOTIFY_TYPE_CUMODE_CHANGE, 3,
1257                                idp1->data, idp1->len,
1258                                mode, 4,
1259                                idp2->data, idp2->len);
1260   silc_buffer_free(idp1);
1261   silc_buffer_free(idp2);
1262 }
1263
1264 /* Sends SIGNOFF notify type. This tells that `client_id' client has
1265    left SILC network. This function is used only between server and router
1266    traffic. This is not used to send the notify to the channel for
1267    client. The `message may be NULL. */
1268
1269 void silc_server_send_notify_signoff(SilcServer server,
1270                                      SilcSocketConnection sock,
1271                                      bool broadcast,
1272                                      SilcClientID *client_id,
1273                                      const char *message)
1274 {
1275   SilcBuffer idp;
1276
1277   idp = silc_id_payload_encode((void *)client_id, SILC_ID_CLIENT);
1278   silc_server_send_notify(server, sock, broadcast,
1279                           SILC_NOTIFY_TYPE_SIGNOFF,
1280                           message ? 2 : 1, idp->data, idp->len,
1281                           message, message ? strlen(message): 0);
1282   silc_buffer_free(idp);
1283 }
1284
1285 /* Sends TOPIC_SET notify type. This tells that `id' changed
1286    the `channel's topic to `topic'. The Notify packet is always destined
1287    to the channel. This function is used to send the topic set notifies
1288    between routers. */
1289
1290 void silc_server_send_notify_topic_set(SilcServer server,
1291                                        SilcSocketConnection sock,
1292                                        bool broadcast,
1293                                        SilcChannelEntry channel,
1294                                        void *id, SilcIdType id_type,
1295                                        char *topic)
1296 {
1297   SilcBuffer idp;
1298
1299   idp = silc_id_payload_encode(id, id_type);
1300   silc_server_send_notify_dest(server, sock, broadcast,
1301                                (void *)channel->id, SILC_ID_CHANNEL,
1302                                SILC_NOTIFY_TYPE_TOPIC_SET,
1303                                topic ? 2 : 1,
1304                                idp->data, idp->len,
1305                                topic, topic ? strlen(topic) : 0);
1306   silc_buffer_free(idp);
1307 }
1308
1309 /* Send KICKED notify type. This tells that the `client_id' on `channel'
1310    was kicked off the channel.  The `comment' may indicate the reason
1311    for the kicking. This function is used only between server and router
1312    traffic. */
1313
1314 void silc_server_send_notify_kicked(SilcServer server,
1315                                     SilcSocketConnection sock,
1316                                     bool broadcast,
1317                                     SilcChannelEntry channel,
1318                                     SilcClientID *client_id,
1319                                     SilcClientID *kicker,
1320                                     char *comment)
1321 {
1322   SilcBuffer idp1;
1323   SilcBuffer idp2;
1324
1325   idp1 = silc_id_payload_encode((void *)client_id, SILC_ID_CLIENT);
1326   idp2 = silc_id_payload_encode((void *)kicker, SILC_ID_CLIENT);
1327   silc_server_send_notify_dest(server, sock, broadcast, (void *)channel->id,
1328                                SILC_ID_CHANNEL, SILC_NOTIFY_TYPE_KICKED, 3,
1329                                idp1->data, idp1->len,
1330                                comment, comment ? strlen(comment) : 0,
1331                                idp2->data, idp2->len);
1332   silc_buffer_free(idp1);
1333   silc_buffer_free(idp2);
1334 }
1335
1336 /* Send KILLED notify type. This tells that the `client_id' client was
1337    killed from the network.  The `comment' may indicate the reason
1338    for the killing. */
1339
1340 void silc_server_send_notify_killed(SilcServer server,
1341                                     SilcSocketConnection sock,
1342                                     bool broadcast,
1343                                     SilcClientID *client_id,
1344                                     char *comment)
1345 {
1346   SilcBuffer idp;
1347
1348   idp = silc_id_payload_encode((void *)client_id, SILC_ID_CLIENT);
1349   silc_server_send_notify_dest(server, sock, broadcast, (void *)client_id,
1350                                SILC_ID_CLIENT, SILC_NOTIFY_TYPE_KILLED,
1351                                comment ? 2 : 1, idp->data, idp->len,
1352                                comment, comment ? strlen(comment) : 0);
1353   silc_buffer_free(idp);
1354 }
1355
1356 /* Sends UMODE_CHANGE notify type. This tells that `client_id' client's
1357    user mode in the SILC Network was changed. This function is used to
1358    send the packet between routers as broadcast packet. */
1359
1360 void silc_server_send_notify_umode(SilcServer server,
1361                                    SilcSocketConnection sock,
1362                                    bool broadcast,
1363                                    SilcClientID *client_id,
1364                                    uint32 mode_mask)
1365 {
1366   SilcBuffer idp;
1367   unsigned char mode[4];
1368
1369   idp = silc_id_payload_encode((void *)client_id, SILC_ID_CLIENT);
1370   SILC_PUT32_MSB(mode_mask, mode);
1371
1372   silc_server_send_notify(server, sock, broadcast,
1373                           SILC_NOTIFY_TYPE_UMODE_CHANGE, 2,
1374                           idp->data, idp->len,
1375                           mode, 4);
1376   silc_buffer_free(idp);
1377 }
1378
1379 /* Sends BAN notify type. This tells that ban has been either `add'ed
1380    or `del'eted on the `channel. This function is used to send the packet
1381    between routers as broadcast packet. */
1382
1383 void silc_server_send_notify_ban(SilcServer server,
1384                                  SilcSocketConnection sock,
1385                                  bool broadcast,
1386                                  SilcChannelEntry channel,
1387                                  char *add, char *del)
1388 {
1389   SilcBuffer idp;
1390
1391   idp = silc_id_payload_encode((void *)channel->id, SILC_ID_CHANNEL);
1392   silc_server_send_notify(server, sock, broadcast,
1393                           SILC_NOTIFY_TYPE_BAN, 3,
1394                           idp->data, idp->len,
1395                           add, add ? strlen(add) : 0,
1396                           del, del ? strlen(del) : 0);
1397   silc_buffer_free(idp);
1398 }
1399
1400 /* Sends INVITE notify type. This tells that invite has been either `add'ed
1401    or `del'eted on the `channel.  The sender of the invite is the `client_id'.
1402    This function is used to send the packet between routers as broadcast
1403    packet. */
1404
1405 void silc_server_send_notify_invite(SilcServer server,
1406                                     SilcSocketConnection sock,
1407                                     bool broadcast,
1408                                     SilcChannelEntry channel,
1409                                     SilcClientID *client_id,
1410                                     char *add, char *del)
1411 {
1412   SilcBuffer idp, idp2;
1413
1414   idp = silc_id_payload_encode((void *)channel->id, SILC_ID_CHANNEL);
1415   idp2 = silc_id_payload_encode((void *)client_id, SILC_ID_CLIENT);
1416   silc_server_send_notify(server, sock, broadcast,
1417                           SILC_NOTIFY_TYPE_INVITE, 5,
1418                           idp->data, idp->len,
1419                           channel->channel_name, strlen(channel->channel_name),
1420                           idp2->data, idp2->len,
1421                           add, add ? strlen(add) : 0,
1422                           del, del ? strlen(del) : 0);
1423   silc_buffer_free(idp);
1424   silc_buffer_free(idp2);
1425 }
1426
1427 /* Sends notify message destined to specific entity. */
1428
1429 void silc_server_send_notify_dest(SilcServer server,
1430                                   SilcSocketConnection sock,
1431                                   bool broadcast,
1432                                   void *dest_id,
1433                                   SilcIdType dest_id_type,
1434                                   SilcNotifyType type,
1435                                   uint32 argc, ...)
1436 {
1437   va_list ap;
1438   SilcBuffer packet;
1439
1440   va_start(ap, argc);
1441
1442   packet = silc_notify_payload_encode(type, argc, ap);
1443   silc_server_packet_send_dest(server, sock, SILC_PACKET_NOTIFY,
1444                                broadcast ? SILC_PACKET_FLAG_BROADCAST : 0,
1445                                dest_id, dest_id_type,
1446                                packet->data, packet->len, FALSE);
1447   silc_buffer_free(packet);
1448   va_end(ap);
1449 }
1450
1451 /* Sends notify message to a channel. The notify message sent is
1452    distributed to all clients on the channel. If `route_notify' is TRUE
1453    then the notify may be routed to primary route or to some other routers.
1454    If FALSE it is assured that the notify is sent only locally. If `sender'
1455    is provided then the packet is not sent to that connection since it
1456    originally came from it. */
1457
1458 void silc_server_send_notify_to_channel(SilcServer server,
1459                                         SilcSocketConnection sender,
1460                                         SilcChannelEntry channel,
1461                                         bool route_notify,
1462                                         SilcNotifyType type,
1463                                         uint32 argc, ...)
1464 {
1465   va_list ap;
1466   SilcBuffer packet;
1467
1468   va_start(ap, argc);
1469
1470   packet = silc_notify_payload_encode(type, argc, ap);
1471   silc_server_packet_send_to_channel(server, sender, channel,
1472                                      SILC_PACKET_NOTIFY, route_notify,
1473                                      packet->data, packet->len, FALSE);
1474   silc_buffer_free(packet);
1475   va_end(ap);
1476 }
1477
1478 /* Send notify message to all channels the client has joined. It is quaranteed
1479    that the message is sent only once to a client (ie. if a client is joined
1480    on two same channel it will receive only one notify message). Also, this
1481    sends only to local clients (locally connected if we are server, and to
1482    local servers if we are router). If `sender' is provided the packet is
1483    not sent to that client at all. */
1484
1485 void silc_server_send_notify_on_channels(SilcServer server,
1486                                          SilcClientEntry sender,
1487                                          SilcClientEntry client,
1488                                          SilcNotifyType type,
1489                                          uint32 argc, ...)
1490 {
1491   int k;
1492   SilcSocketConnection sock = NULL;
1493   SilcPacketContext packetdata;
1494   SilcClientEntry c;
1495   SilcClientEntry *sent_clients = NULL;
1496   uint32 sent_clients_count = 0;
1497   SilcServerEntry *routed = NULL;
1498   uint32 routed_count = 0;
1499   SilcHashTableList htl, htl2;
1500   SilcChannelEntry channel;
1501   SilcChannelClientEntry chl, chl2;
1502   SilcIDListData idata;
1503   SilcBuffer packet;
1504   unsigned char *data;
1505   uint32 data_len;
1506   bool force_send = FALSE;
1507   va_list ap;
1508
1509   SILC_LOG_DEBUG(("Start"));
1510
1511   if (!silc_hash_table_count(client->channels))
1512     return;
1513
1514   va_start(ap, argc);
1515   packet = silc_notify_payload_encode(type, argc, ap);
1516   data = packet->data;
1517   data_len = packet->len;
1518
1519   /* Set the packet context pointers. */
1520   packetdata.flags = 0;
1521   packetdata.type = SILC_PACKET_NOTIFY;
1522   packetdata.src_id = silc_id_id2str(server->id, SILC_ID_SERVER);
1523   packetdata.src_id_len = silc_id_get_len(server->id, SILC_ID_SERVER);
1524   packetdata.src_id_type = SILC_ID_SERVER;
1525
1526   silc_hash_table_list(client->channels, &htl);
1527   while (silc_hash_table_get(&htl, NULL, (void *)&chl)) {
1528     channel = chl->channel;
1529
1530     /* Send the message to all clients on the channel's client list. */
1531     silc_hash_table_list(channel->user_list, &htl2);
1532     while (silc_hash_table_get(&htl2, NULL, (void *)&chl2)) {
1533       c = chl2->client;
1534
1535       if (sender && c == sender)
1536         continue;
1537
1538       /* Check if we have sent the packet to this client already */
1539       for (k = 0; k < sent_clients_count; k++)
1540         if (sent_clients[k] == c)
1541           break;
1542       if (k < sent_clients_count)
1543         continue;
1544
1545       /* If we are router and if this client has router set it is not
1546          locally connected client and we will route the message to the
1547          router set in the client. */
1548       if (c && c->router && server->server_type == SILC_ROUTER) {
1549         /* Check if we have sent the packet to this route already */
1550         for (k = 0; k < routed_count; k++)
1551           if (routed[k] == c->router)
1552             break;
1553         if (k < routed_count)
1554           continue;
1555
1556         /* Get data used in packet header encryption, keys and stuff. */
1557         sock = (SilcSocketConnection)c->router->connection;
1558         idata = (SilcIDListData)c->router;
1559
1560         {
1561           SILC_LOG_DEBUG(("*****************"));
1562           SILC_LOG_DEBUG(("client->router->id %s",
1563                           silc_id_render(c->router->id, SILC_ID_SERVER)));
1564           SILC_LOG_DEBUG(("client->router->connection->user_data->id %s",
1565                           silc_id_render(((SilcServerEntry)sock->user_data)->id, SILC_ID_SERVER)));
1566         }
1567
1568         packetdata.dst_id = silc_id_id2str(c->router->id, SILC_ID_SERVER);
1569         packetdata.dst_id_len = silc_id_get_len(c->router->id, SILC_ID_SERVER);
1570         packetdata.dst_id_type = SILC_ID_SERVER;
1571
1572         /* Send the packet */
1573         silc_server_packet_send_to_channel_real(server, sock, &packetdata,
1574                                                 idata->send_key,
1575                                                 idata->hmac_send,
1576                                                 idata->psn_send++,
1577                                                 data, data_len, FALSE,
1578                                                 force_send);
1579
1580         silc_free(packetdata.dst_id);
1581
1582         /* We want to make sure that the packet is routed to same router
1583            only once. Mark this route as sent route. */
1584         routed = silc_realloc(routed, sizeof(*routed) * (routed_count + 1));
1585         routed[routed_count++] = c->router;
1586         continue;
1587       }
1588
1589       if (c && c->router)
1590         continue;
1591
1592       /* Send to locally connected client */
1593       if (c) {
1594
1595         /* Get data used in packet header encryption, keys and stuff. */
1596         sock = (SilcSocketConnection)c->connection;
1597         idata = (SilcIDListData)c;
1598
1599         packetdata.dst_id = silc_id_id2str(c->id, SILC_ID_CLIENT);
1600         packetdata.dst_id_len = silc_id_get_len(c->id, SILC_ID_CLIENT);
1601         packetdata.dst_id_type = SILC_ID_CLIENT;
1602
1603         /* Send the packet */
1604         silc_server_packet_send_to_channel_real(server, sock, &packetdata,
1605                                                 idata->send_key,
1606                                                 idata->hmac_send,
1607                                                 idata->psn_send++,
1608                                                 data, data_len, FALSE,
1609                                                 force_send);
1610
1611         silc_free(packetdata.dst_id);
1612
1613         /* Make sure that we send the notify only once per client. */
1614         sent_clients = silc_realloc(sent_clients, sizeof(*sent_clients) *
1615                                     (sent_clients_count + 1));
1616         sent_clients[sent_clients_count++] = c;
1617       }
1618     }
1619     silc_hash_table_list_reset(&htl2);
1620   }
1621
1622   silc_hash_table_list_reset(&htl);
1623   silc_free(routed);
1624   silc_free(sent_clients);
1625   silc_free(packetdata.src_id);
1626   silc_buffer_free(packet);
1627   va_end(ap);
1628 }
1629
1630 /* Sends New ID Payload to remote end. The packet is used to distribute
1631    information about new registered clients, servers, channel etc. usually
1632    to routers so that they can keep these information up to date.
1633    If the argument `broadcast' is TRUE then the packet is sent as
1634    broadcast packet. */
1635
1636 void silc_server_send_new_id(SilcServer server,
1637                              SilcSocketConnection sock,
1638                              bool broadcast,
1639                              void *id, SilcIdType id_type,
1640                              uint32 id_len)
1641 {
1642   SilcBuffer idp;
1643
1644   SILC_LOG_DEBUG(("Start"));
1645
1646   idp = silc_id_payload_encode(id, id_type);
1647   silc_server_packet_send(server, sock, SILC_PACKET_NEW_ID,
1648                           broadcast ? SILC_PACKET_FLAG_BROADCAST : 0,
1649                           idp->data, idp->len, FALSE);
1650
1651   /* Send to backup routers if this is being broadcasted to primary
1652      router. */
1653   if (server->router && server->router->connection &&
1654       sock == server->router->connection && broadcast)
1655     silc_server_backup_send(server, NULL, SILC_PACKET_NEW_ID, 0,
1656                             idp->data, idp->len, FALSE, TRUE);
1657
1658   silc_buffer_free(idp);
1659 }
1660
1661 /* Send New Channel Payload to notify about newly created channel in the
1662    SILC network. Router uses this to notify other routers in the network
1663    about new channel. This packet is broadcasted by router. */
1664
1665 void silc_server_send_new_channel(SilcServer server,
1666                                   SilcSocketConnection sock,
1667                                   bool broadcast,
1668                                   char *channel_name,
1669                                   void *channel_id,
1670                                   uint32 channel_id_len,
1671                                   uint32 mode)
1672 {
1673   SilcBuffer packet;
1674   unsigned char *cid;
1675   uint32 name_len = strlen(channel_name);
1676
1677   SILC_LOG_DEBUG(("Start"));
1678
1679   cid = silc_id_id2str(channel_id, SILC_ID_CHANNEL);
1680   if (!cid)
1681     return;
1682
1683   /* Encode the channel payload */
1684   packet = silc_channel_payload_encode(channel_name, name_len,
1685                                        cid, channel_id_len, mode);
1686
1687   silc_server_packet_send(server, sock, SILC_PACKET_NEW_CHANNEL,
1688                           broadcast ? SILC_PACKET_FLAG_BROADCAST : 0,
1689                           packet->data, packet->len, FALSE);
1690
1691   /* Send to backup routers if this is being broadcasted to primary
1692      router. */
1693   if (server->server_type == SILC_ROUTER &&
1694       server->router && server->router->connection &&
1695       sock == server->router->connection && broadcast)
1696     silc_server_backup_send(server, NULL, SILC_PACKET_NEW_CHANNEL, 0,
1697                             packet->data, packet->len, FALSE, TRUE);
1698
1699   silc_free(cid);
1700   silc_buffer_free(packet);
1701 }
1702
1703 /* Send Channel Key payload to distribute the new channel key. Normal server
1704    sends this to router when new client joins to existing channel. Router
1705    sends this to the local server who sent the join command in case where
1706    the channel did not exist yet. Both normal and router servers uses this
1707    also to send this to locally connected clients on the channel. This
1708    must not be broadcasted packet. Routers do not send this to each other.
1709    If `sender is provided then the packet is not sent to that connection since
1710    it originally came from it. */
1711
1712 void silc_server_send_channel_key(SilcServer server,
1713                                   SilcSocketConnection sender,
1714                                   SilcChannelEntry channel,
1715                                   unsigned char route)
1716 {
1717   SilcBuffer packet;
1718   unsigned char *chid;
1719   uint32 tmp_len;
1720
1721   SILC_LOG_DEBUG(("Sending key to channel %s", channel->channel_name));
1722
1723   chid = silc_id_id2str(channel->id, SILC_ID_CHANNEL);
1724   if (!chid)
1725     return;
1726
1727   /* Encode channel key packet */
1728   tmp_len = strlen(channel->channel_key->cipher->name);
1729   packet = silc_channel_key_payload_encode(silc_id_get_len(channel->id,
1730                                                            SILC_ID_CHANNEL),
1731                                            chid, tmp_len,
1732                                            channel->channel_key->cipher->name,
1733                                            channel->key_len / 8, channel->key);
1734   silc_server_packet_send_to_channel(server, sender, channel,
1735                                      SILC_PACKET_CHANNEL_KEY,
1736                                      route, packet->data, packet->len,
1737                                      FALSE);
1738   silc_buffer_free(packet);
1739   silc_free(chid);
1740 }
1741
1742 /* Generic function to send any command. The arguments must be sent already
1743    encoded into correct form in correct order. */
1744
1745 void silc_server_send_command(SilcServer server,
1746                               SilcSocketConnection sock,
1747                               SilcCommand command,
1748                               uint16 ident,
1749                               uint32 argc, ...)
1750 {
1751   SilcBuffer packet;
1752   va_list ap;
1753
1754   va_start(ap, argc);
1755
1756   packet = silc_command_payload_encode_vap(command, ident, argc, ap);
1757   silc_server_packet_send(server, sock, SILC_PACKET_COMMAND, 0,
1758                           packet->data, packet->len, TRUE);
1759   silc_buffer_free(packet);
1760   va_end(ap);
1761 }
1762
1763 /* Generic function to send any command reply. The arguments must be sent
1764    already encoded into correct form in correct order. */
1765
1766 void silc_server_send_command_reply(SilcServer server,
1767                                     SilcSocketConnection sock,
1768                                     SilcCommand command,
1769                                     SilcCommandStatus status,
1770                                     uint16 ident,
1771                                     uint32 argc, ...)
1772 {
1773   SilcBuffer packet;
1774   va_list ap;
1775
1776   va_start(ap, argc);
1777
1778   packet = silc_command_reply_payload_encode_vap(command, status, ident,
1779                                                  argc, ap);
1780   silc_server_packet_send(server, sock, SILC_PACKET_COMMAND_REPLY, 0,
1781                           packet->data, packet->len, TRUE);
1782   silc_buffer_free(packet);
1783   va_end(ap);
1784 }
1785
1786 /* Generic function to send any command reply. The arguments must be sent
1787    already encoded into correct form in correct order. */
1788
1789 void silc_server_send_dest_command_reply(SilcServer server,
1790                                          SilcSocketConnection sock,
1791                                          void *dst_id,
1792                                          SilcIdType dst_id_type,
1793                                          SilcCommand command,
1794                                          SilcCommandStatus status,
1795                                          uint16 ident,
1796                                          uint32 argc, ...)
1797 {
1798   SilcBuffer packet;
1799   va_list ap;
1800
1801   va_start(ap, argc);
1802
1803   packet = silc_command_reply_payload_encode_vap(command, status, ident,
1804                                                  argc, ap);
1805   silc_server_packet_send_dest(server, sock, SILC_PACKET_COMMAND_REPLY, 0,
1806                                dst_id, dst_id_type, packet->data,
1807                                packet->len, TRUE);
1808   silc_buffer_free(packet);
1809   va_end(ap);
1810 }
1811
1812 /* Send the heartbeat packet. */
1813
1814 void silc_server_send_heartbeat(SilcServer server,
1815                                 SilcSocketConnection sock)
1816 {
1817   silc_server_packet_send(server, sock, SILC_PACKET_HEARTBEAT, 0,
1818                           NULL, 0, FALSE);
1819 }
1820
1821 /* Generic function to relay packet we've received. This is used to relay
1822    packets to a client but generally can be used to other purposes as well. */
1823
1824 void silc_server_relay_packet(SilcServer server,
1825                               SilcSocketConnection dst_sock,
1826                               SilcCipher cipher,
1827                               SilcHmac hmac,
1828                               uint32 sequence,
1829                               SilcPacketContext *packet,
1830                               bool force_send)
1831 {
1832   silc_buffer_push(packet->buffer, SILC_PACKET_HEADER_LEN + packet->src_id_len
1833                    + packet->dst_id_len + packet->padlen);
1834
1835   silc_packet_send_prepare(dst_sock, 0, 0, packet->buffer->len);
1836   silc_buffer_put(dst_sock->outbuf, packet->buffer->data, packet->buffer->len);
1837
1838   /* Re-encrypt packet */
1839   silc_packet_encrypt(cipher, hmac, sequence, dst_sock->outbuf,
1840                       packet->buffer->len);
1841
1842   /* Send the packet */
1843   silc_server_packet_send_real(server, dst_sock, force_send);
1844
1845   silc_buffer_pull(packet->buffer, SILC_PACKET_HEADER_LEN + packet->src_id_len
1846                    + packet->dst_id_len + packet->padlen);
1847 }
1848
1849 /* Routine used to send the connection authentication packet. */
1850
1851 void silc_server_send_connection_auth_request(SilcServer server,
1852                                               SilcSocketConnection sock,
1853                                               uint16 conn_type,
1854                                               SilcAuthMethod auth_meth)
1855 {
1856   SilcBuffer packet;
1857
1858   packet = silc_buffer_alloc(4);
1859   silc_buffer_pull_tail(packet, SILC_BUFFER_END(packet));
1860   silc_buffer_format(packet,
1861                      SILC_STR_UI_SHORT(conn_type),
1862                      SILC_STR_UI_SHORT(auth_meth),
1863                      SILC_STR_END);
1864
1865   silc_server_packet_send(server, sock, SILC_PACKET_CONNECTION_AUTH_REQUEST,
1866                           0, packet->data, packet->len, FALSE);
1867   silc_buffer_free(packet);
1868 }
1869
1870 /* Purge the outgoing packet queue to the network if there is data. This
1871    function can be used to empty the packet queue. It is guaranteed that
1872    after this function returns the outgoing data queue is empty. */
1873
1874 void silc_server_packet_queue_purge(SilcServer server,
1875                                     SilcSocketConnection sock)
1876 {
1877   if (sock && SILC_IS_OUTBUF_PENDING(sock) &&
1878       (SILC_IS_DISCONNECTED(sock) == FALSE)) {
1879     server->stat.packets_sent++;
1880
1881     if (sock->outbuf->data - sock->outbuf->head)
1882       silc_buffer_push(sock->outbuf, sock->outbuf->data - sock->outbuf->head);
1883
1884     silc_packet_send(sock, TRUE);
1885
1886     SILC_SET_CONNECTION_FOR_INPUT(server->schedule, sock->sock);
1887     SILC_UNSET_OUTBUF_PENDING(sock);
1888     silc_buffer_clear(sock->outbuf);
1889   }
1890 }