apps/silcd/packet_send.c

   1 /*
   2
   3   packet_send.c
   4
   5   Author: Pekka Riikonen <priikone@silcnet.org>
   6
   7   Copyright (C) 1997 - 2002 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                              SilcUInt32 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                                   SilcUInt32 data_len,
 137                                   bool force_send)
 138 {
 139   SilcPacketContext packetdata;
 140   const SilcBufferStruct packet;
 141   SilcIDListData idata = (SilcIDListData)sock->user_data;
 142   SilcCipher cipher = NULL;
 143   SilcHmac hmac = NULL;
 144   SilcUInt32 sequence = 0;
 145   unsigned char *dst_id_data = NULL;
 146   SilcUInt32 dst_id_len = 0;
 147   int block_len = 0;
 148
 149   /* If disconnecting, ignore the data */
 150   if (SILC_IS_DISCONNECTING(sock))
 151     return;
 152
 153   /* If entry is disabled do not sent anything. */
 154   if (idata && idata->status & SILC_IDLIST_STATUS_DISABLED)
 155     return;
 156
 157   SILC_LOG_DEBUG(("Sending packet, type %d", type));
 158
 159   if (dst_id) {
 160     dst_id_data = silc_id_id2str(dst_id, dst_id_type);
 161     dst_id_len = silc_id_get_len(dst_id, dst_id_type);
 162   }
 163
 164   if (idata) {
 165     cipher = idata->send_key;
 166     hmac = idata->hmac_send;
 167     sequence = idata->psn_send++;
 168     block_len = silc_cipher_get_block_len(cipher);
 169   }
 170
 171   /* Set the packet context pointers */
 172   packetdata.type = type;
 173   packetdata.flags = flags;
 174   packetdata.src_id = silc_id_id2str(server->id, server->id_type);
 175   packetdata.src_id_len = silc_id_get_len(server->id, server->id_type);
 176   packetdata.src_id_type = server->id_type;
 177   packetdata.dst_id = dst_id_data;
 178   packetdata.dst_id_len = dst_id_len;
 179   packetdata.dst_id_type = dst_id_type;
 180   data_len = SILC_PACKET_DATALEN(data_len, (SILC_PACKET_HEADER_LEN +
 181                                             packetdata.src_id_len +
 182                                             packetdata.dst_id_len));
 183   packetdata.truelen = data_len + SILC_PACKET_HEADER_LEN +
 184     packetdata.src_id_len + dst_id_len;
 185   packetdata.padlen = SILC_PACKET_PADLEN(packetdata.truelen, block_len);
 186
 187   /* Create the outgoing packet */
 188   if (!silc_packet_assemble(&packetdata, NULL, cipher, hmac, sock,
 189                             data, data_len, (const SilcBuffer)&packet)) {
 190     SILC_LOG_ERROR(("Cannot assemble packet"));
 191     goto out;
 192   }
 193
 194   /* Encrypt the packet */
 195   silc_packet_encrypt(cipher, hmac, sequence, (SilcBuffer)&packet, packet.len);
 196
 197   SILC_LOG_HEXDUMP(("Outgoing packet (%d), len %d", sequence, packet.len),
 198                    packet.data, packet.len);
 199
 200   /* Now actually send the packet */
 201   silc_server_packet_send_real(server, sock, force_send);
 202
 203  out:
 204   if (packetdata.src_id)
 205     silc_free(packetdata.src_id);
 206   if (packetdata.dst_id)
 207     silc_free(packetdata.dst_id);
 208 }
 209
 210 /* Assembles a new packet to be sent out to network. This doesn't actually
 211    send the packet but creates the packet and fills the outgoing data
 212    buffer and marks the packet ready to be sent to network. However, If
 213    argument force_send is TRUE the packet is sent immediately and not put
 214    to queue. Normal case is that the packet is not sent immediately.
 215    The source and destination information is sent as argument for this
 216    function. */
 217
 218 void silc_server_packet_send_srcdest(SilcServer server,
 219                                      SilcSocketConnection sock,
 220                                      SilcPacketType type,
 221                                      SilcPacketFlags flags,
 222                                      void *src_id,
 223                                      SilcIdType src_id_type,
 224                                      void *dst_id,
 225                                      SilcIdType dst_id_type,
 226                                      unsigned char *data,
 227                                      SilcUInt32 data_len,
 228                                      bool force_send)
 229 {
 230   SilcPacketContext packetdata;
 231   const SilcBufferStruct packet;
 232   SilcIDListData idata;
 233   SilcCipher cipher = NULL;
 234   SilcHmac hmac = NULL;
 235   SilcUInt32 sequence = 0;
 236   unsigned char *dst_id_data = NULL;
 237   SilcUInt32 dst_id_len = 0;
 238   unsigned char *src_id_data = NULL;
 239   SilcUInt32 src_id_len = 0;
 240   int block_len = 0;
 241
 242   SILC_LOG_DEBUG(("Sending packet, type %d", type));
 243
 244   /* Get data used in the packet sending, keys and stuff */
 245   idata = (SilcIDListData)sock->user_data;
 246
 247   if (dst_id) {
 248     dst_id_data = silc_id_id2str(dst_id, dst_id_type);
 249     dst_id_len = silc_id_get_len(dst_id, dst_id_type);
 250   }
 251
 252   if (src_id) {
 253     src_id_data = silc_id_id2str(src_id, src_id_type);
 254     src_id_len = silc_id_get_len(src_id, src_id_type);
 255   }
 256
 257   if (idata) {
 258     cipher = idata->send_key;
 259     hmac = idata->hmac_send;
 260     sequence = idata->psn_send++;
 261     block_len = silc_cipher_get_block_len(cipher);
 262   }
 263
 264   /* Set the packet context pointers */
 265   packetdata.type = type;
 266   packetdata.flags = flags;
 267   packetdata.src_id = src_id_data;
 268   packetdata.src_id_len = src_id_len;
 269   packetdata.src_id_type = src_id_type;
 270   packetdata.dst_id = dst_id_data;
 271   packetdata.dst_id_len = dst_id_len;
 272   packetdata.dst_id_type = dst_id_type;
 273   data_len = SILC_PACKET_DATALEN(data_len, (SILC_PACKET_HEADER_LEN +
 274                                             packetdata.src_id_len +
 275                                             dst_id_len));
 276   packetdata.truelen = data_len + SILC_PACKET_HEADER_LEN +
 277     packetdata.src_id_len + dst_id_len;
 278   packetdata.padlen = SILC_PACKET_PADLEN(packetdata.truelen, block_len);
 279
 280   /* Create the outgoing packet */
 281   if (!silc_packet_assemble(&packetdata, NULL, cipher, hmac, sock, data,
 282                             data_len, (const SilcBuffer)&packet)) {
 283     SILC_LOG_ERROR(("Cannot assemble packe"));
 284     goto out;
 285   }
 286
 287   /* Encrypt the packet */
 288   silc_packet_encrypt(cipher, hmac, sequence, (SilcBuffer)&packet, packet.len);
 289
 290   SILC_LOG_HEXDUMP(("Outgoing packet (%d), len %d", sequence, packet.len),
 291                    packet.data, packet.len);
 292
 293   /* Now actually send the packet */
 294   silc_server_packet_send_real(server, sock, force_send);
 295
 296  out:
 297   if (packetdata.src_id)
 298     silc_free(packetdata.src_id);
 299   if (packetdata.dst_id)
 300     silc_free(packetdata.dst_id);
 301 }
 302
 303 /* Broadcast received packet to our primary route. This function is used
 304    by router to further route received broadcast packet. It is expected
 305    that the broadcast flag from the packet is checked before calling this
 306    function. This does not test or set the broadcast flag. */
 307
 308 void silc_server_packet_broadcast(SilcServer server,
 309                                   SilcSocketConnection sock,
 310                                   SilcPacketContext *packet)
 311 {
 312   SilcBuffer buffer = packet->buffer;
 313   SilcIDListData idata;
 314   void *id;
 315
 316   SILC_LOG_DEBUG(("Broadcasting received broadcast packet"));
 317
 318   /* If the packet is originated from our primary route we are
 319      not allowed to send the packet. */
 320   id = silc_id_str2id(packet->src_id, packet->src_id_len, packet->src_id_type);
 321   if (id && !SILC_ID_SERVER_COMPARE(id, server->router->id)) {
 322     const SilcBufferStruct p;
 323
 324     idata = (SilcIDListData)sock->user_data;
 325
 326     silc_buffer_push(buffer, buffer->data - buffer->head);
 327     if (!silc_packet_send_prepare(sock, 0, 0, buffer->len, idata->hmac_send,
 328                                   (const SilcBuffer)&p)) {
 329       SILC_LOG_ERROR(("Cannot send packet"));
 330       silc_free(id);
 331       return;
 332     }
 333     silc_buffer_put((SilcBuffer)&p, buffer->data, buffer->len);
 334     silc_packet_encrypt(idata->send_key, idata->hmac_send, idata->psn_send++,
 335                         (SilcBuffer)&p, p.len);
 336
 337     SILC_LOG_HEXDUMP(("Broadcasted packet (%d), len %d", idata->psn_send - 1,
 338                       p.len), p.data, p.len);
 339
 340     /* Now actually send the packet */
 341     silc_server_packet_send_real(server, sock, TRUE);
 342     silc_free(id);
 343     return;
 344   }
 345
 346   SILC_LOG_DEBUG(("Will not broadcast to primary route since it is the "
 347                   "original sender of this packet"));
 348   silc_free(id);
 349 }
 350
 351 /* Routes received packet to `sock'. This is used to route the packets that
 352    router receives but are not destined to it. */
 353
 354 void silc_server_packet_route(SilcServer server,
 355                               SilcSocketConnection sock,
 356                               SilcPacketContext *packet)
 357 {
 358   SilcBuffer buffer = packet->buffer;
 359   const SilcBufferStruct p;
 360   SilcIDListData idata;
 361
 362   SILC_LOG_DEBUG(("Routing received packet"));
 363
 364   idata = (SilcIDListData)sock->user_data;
 365
 366   silc_buffer_push(buffer, buffer->data - buffer->head);
 367   if (!silc_packet_send_prepare(sock, 0, 0, buffer->len, idata->hmac_send,
 368                                 (const SilcBuffer)&p)) {
 369     SILC_LOG_ERROR(("Cannot send packet"));
 370     return;
 371   }
 372   silc_buffer_put((SilcBuffer)&p, buffer->data, buffer->len);
 373   silc_packet_encrypt(idata->send_key, idata->hmac_send, idata->psn_send++,
 374                       (SilcBuffer)&p, p.len);
 375
 376   SILC_LOG_HEXDUMP(("Routed packet (%d), len %d", idata->psn_send - 1,
 377                    p.len), p.data, p.len);
 378
 379   /* Now actually send the packet */
 380   silc_server_packet_send_real(server, sock, TRUE);
 381 }
 382
 383 /* This routine can be used to send a packet to table of clients provided
 384    in `clients'. If `route' is FALSE the packet is routed only to local
 385    clients (for server locally connected, and for router local cell). */
 386
 387 void silc_server_packet_send_clients(SilcServer server,
 388                                      SilcClientEntry *clients,
 389                                      SilcUInt32 clients_count,
 390                                      SilcPacketType type,
 391                                      SilcPacketFlags flags,
 392                                      bool route,
 393                                      unsigned char *data,
 394                                      SilcUInt32 data_len,
 395                                      bool force_send)
 396 {
 397   SilcSocketConnection sock = NULL;
 398   SilcClientEntry client = NULL;
 399   SilcServerEntry *routed = NULL;
 400   SilcUInt32 routed_count = 0;
 401   bool gone = FALSE;
 402   int i, k;
 403
 404   SILC_LOG_DEBUG(("Sending packet to list of clients"));
 405
 406   /* Send to all clients in table */
 407   for (i = 0; i < clients_count; i++) {
 408     client = clients[i];
 409
 410     /* If client has router set it is not locally connected client and
 411        we will route the message to the router set in the client. Though,
 412        send locally connected server in all cases. */
 413     if (server->server_type == SILC_ROUTER && client->router &&
 414         ((!route && client->router->router == server->id_entry) || route)) {
 415
 416       /* Check if we have sent the packet to this route already */
 417       for (k = 0; k < routed_count; k++)
 418         if (routed[k] == client->router)
 419           break;
 420       if (k < routed_count)
 421         continue;
 422
 423       /* Route only once to router */
 424       sock = (SilcSocketConnection)client->router->connection;
 425       if (sock->type == SILC_SOCKET_TYPE_ROUTER) {
 426         if (gone)
 427           continue;
 428         gone = TRUE;
 429       }
 430
 431       /* Send the packet */
 432       silc_server_packet_send_dest(server, sock, type, flags,
 433                                    client->router->id, SILC_ID_SERVER,
 434                                    data, data_len, force_send);
 435
 436       /* Mark this route routed already */
 437       routed = silc_realloc(routed, sizeof(*routed) * (routed_count + 1));
 438       routed[routed_count++] = client->router;
 439       continue;
 440     }
 441
 442     if (client->router)
 443       continue;
 444
 445     /* Send to locally connected client */
 446     sock = (SilcSocketConnection)client->connection;
 447     if (!sock)
 448       continue;
 449
 450     silc_server_packet_send_dest(server, sock, type, flags,
 451                                  client->id, SILC_ID_CLIENT,
 452                                  data, data_len, force_send);
 453   }
 454
 455   silc_free(routed);
 456 }
 457
 458 /* Internal routine to actually create the channel packet and send it
 459    to network. This is common function in channel message sending. If
 460    `channel_message' is TRUE this encrypts the message as it is strictly
 461    a channel message. If FALSE normal encryption process is used. */
 462
 463 static void
 464 silc_server_packet_send_to_channel_real(SilcServer server,
 465                                         SilcSocketConnection sock,
 466                                         SilcPacketContext *packet,
 467                                         SilcCipher cipher,
 468                                         SilcHmac hmac,
 469                                         SilcUInt32 sequence,
 470                                         unsigned char *data,
 471                                         SilcUInt32 data_len,
 472                                         bool channel_message,
 473                                         bool force_send)
 474 {
 475   int block_len;
 476   const SilcBufferStruct p;
 477
 478   if (!sock)
 479     return;
 480
 481   data_len = SILC_PACKET_DATALEN(data_len, (SILC_PACKET_HEADER_LEN +
 482                                             packet->src_id_len +
 483                                             packet->dst_id_len));
 484   packet->truelen = data_len + SILC_PACKET_HEADER_LEN +
 485     packet->src_id_len + packet->dst_id_len;
 486
 487   block_len = cipher ? silc_cipher_get_block_len(cipher) : 0;
 488   if (channel_message)
 489     packet->padlen = SILC_PACKET_PADLEN((SILC_PACKET_HEADER_LEN +
 490                                          packet->src_id_len +
 491                                          packet->dst_id_len), block_len);
 492   else
 493     packet->padlen = SILC_PACKET_PADLEN(packet->truelen, block_len);
 494
 495   /* Put the data to buffer, assemble and encrypt the packet. The packet
 496      is encrypted with normal session key shared with the client, unless
 497      the `channel_message' is TRUE. */
 498   if (!silc_packet_assemble(packet, NULL, cipher, hmac, sock, data,
 499                             data_len, (const SilcBuffer)&p)) {
 500     SILC_LOG_ERROR(("Cannot assemble packet"));
 501     return;
 502   }
 503
 504   if (channel_message)
 505     silc_packet_encrypt(cipher, hmac, sequence, (SilcBuffer)&p,
 506                         SILC_PACKET_HEADER_LEN + packet->src_id_len +
 507                         packet->dst_id_len + packet->padlen);
 508   else
 509     silc_packet_encrypt(cipher, hmac, sequence, (SilcBuffer)&p, p.len);
 510
 511   SILC_LOG_HEXDUMP(("Channel packet (%d), len %d", sequence, p.len),
 512                    p.data, p.len);
 513
 514   /* Now actually send the packet */
 515   silc_server_packet_send_real(server, sock, force_send);
 516 }
 517
 518 /* This routine is used by the server to send packets to channel. The
 519    packet sent with this function is distributed to all clients on
 520    the channel. Usually this is used to send notify messages to the
 521    channel, things like notify about new user joining to the channel.
 522    If `route' is FALSE then the packet is sent only locally and will not
 523    be routed anywhere (for router locally means cell wide). If `sender'
 524    is provided then the packet is not sent to that connection since it
 525    originally came from it. If `send_to_clients' is FALSE then the
 526    packet is not sent clients, only servers. */
 527
 528 void silc_server_packet_send_to_channel(SilcServer server,
 529                                         SilcSocketConnection sender,
 530                                         SilcChannelEntry channel,
 531                                         SilcPacketType type,
 532                                         bool route,
 533                                         unsigned char *data,
 534                                         SilcUInt32 data_len,
 535                                         bool force_send)
 536 {
 537   SilcSocketConnection sock = NULL;
 538   SilcPacketContext packetdata;
 539   SilcClientEntry client = NULL;
 540   SilcServerEntry *routed = NULL;
 541   SilcChannelClientEntry chl;
 542   SilcHashTableList htl;
 543   SilcIDListData idata;
 544   SilcUInt32 routed_count = 0;
 545   bool gone = FALSE;
 546   int k;
 547
 548   /* This doesn't send channel message packets */
 549   assert(type != SILC_PACKET_CHANNEL_MESSAGE);
 550
 551   SILC_LOG_DEBUG(("Sending packet to channel"));
 552
 553   /* Set the packet context pointers. */
 554   packetdata.flags = 0;
 555   packetdata.type = type;
 556   packetdata.src_id = silc_id_id2str(server->id, SILC_ID_SERVER);
 557   packetdata.src_id_len = silc_id_get_len(server->id, SILC_ID_SERVER);
 558   packetdata.src_id_type = SILC_ID_SERVER;
 559   packetdata.dst_id = silc_id_id2str(channel->id, SILC_ID_CHANNEL);
 560   packetdata.dst_id_len = silc_id_get_len(channel->id, SILC_ID_CHANNEL);
 561   packetdata.dst_id_type = SILC_ID_CHANNEL;
 562
 563   /* If there are global users in the channel we will send the message
 564      first to our router for further routing. */
 565   if (route && server->server_type != SILC_ROUTER && !server->standalone &&
 566       channel->global_users) {
 567     SilcServerEntry router;
 568
 569     /* Get data used in packet header encryption, keys and stuff. */
 570     router = server->router;
 571     sock = (SilcSocketConnection)router->connection;
 572     idata = (SilcIDListData)router;
 573
 574     if (sock != sender) {
 575       SILC_LOG_DEBUG(("Sending packet to router for routing"));
 576
 577       silc_server_packet_send_to_channel_real(server, sock, &packetdata,
 578                                               idata->send_key,
 579                                               idata->hmac_send,
 580                                               idata->psn_send++,
 581                                               data, data_len, FALSE,
 582                                               force_send);
 583     }
 584   }
 585
 586   routed = silc_calloc(silc_hash_table_count(channel->user_list),
 587                        sizeof(*routed));
 588
 589   /* Send the message to clients on the channel's client list. */
 590   silc_hash_table_list(channel->user_list, &htl);
 591   while (silc_hash_table_get(&htl, NULL, (void *)&chl)) {
 592     client = chl->client;
 593     if (!client)
 594       continue;
 595
 596     /* If client has router set it is not locally connected client and
 597        we will route the message to the router set in the client. Though,
 598        send locally connected server in all cases. */
 599     if (server->server_type == SILC_ROUTER && client->router &&
 600         ((!route && client->router->router == server->id_entry) || route)) {
 601
 602       /* Check if we have sent the packet to this route already */
 603       for (k = 0; k < routed_count; k++)
 604         if (routed[k] == client->router)
 605           break;
 606       if (k < routed_count)
 607         continue;
 608
 609       /* Get data used in packet header encryption, keys and stuff. */
 610       sock = (SilcSocketConnection)client->router->connection;
 611       idata = (SilcIDListData)client->router;
 612
 613       if (sender && sock == sender)
 614         continue;
 615
 616       /* Route only once to router. Protocol prohibits sending channel
 617          messages to more than one router. */
 618       if (sock->type == SILC_SOCKET_TYPE_ROUTER) {
 619         if (gone)
 620           continue;
 621         gone = TRUE;
 622       }
 623
 624       /* Send the packet */
 625       silc_server_packet_send_to_channel_real(server, sock, &packetdata,
 626                                               idata->send_key,
 627                                               idata->hmac_send,
 628                                               idata->psn_send++,
 629                                               data, data_len, FALSE,
 630                                               force_send);
 631
 632       /* Mark this route routed already */
 633       routed[routed_count++] = client->router;
 634       continue;
 635     }
 636
 637     if (client->router)
 638       continue;
 639
 640     /* Send to locally connected client */
 641
 642     /* Get data used in packet header encryption, keys and stuff. */
 643     sock = (SilcSocketConnection)client->connection;
 644     idata = (SilcIDListData)client;
 645
 646     if (!sock || (sender && sock == sender))
 647       continue;
 648
 649     /* Send the packet */
 650     silc_server_packet_send_to_channel_real(server, sock, &packetdata,
 651                                             idata->send_key,
 652                                             idata->hmac_send,
 653                                             idata->psn_send++,
 654                                             data, data_len, FALSE,
 655                                             force_send);
 656   }
 657
 658   silc_hash_table_list_reset(&htl);
 659   silc_free(routed);
 660   silc_free(packetdata.src_id);
 661   silc_free(packetdata.dst_id);
 662 }
 663
 664 /* This checks whether the relayed packet came from router. If it did
 665    then we'll need to encrypt it with the channel key. This is called
 666    from the silc_server_packet_relay_to_channel. */
 667
 668 static bool
 669 silc_server_packet_relay_to_channel_encrypt(SilcServer server,
 670                                             SilcSocketConnection sock,
 671                                             SilcChannelEntry channel,
 672                                             unsigned char *data,
 673                                             unsigned int data_len)
 674 {
 675   /* If we are router and the packet came from router and private key
 676      has not been set for the channel then we must encrypt the packet
 677      as it was decrypted with the session key shared between us and the
 678      router which sent it. This is so, because cells does not share the
 679      same channel key. */
 680   if (server->server_type == SILC_ROUTER &&
 681       sock->type == SILC_SOCKET_TYPE_ROUTER &&
 682       !(channel->mode & SILC_CHANNEL_MODE_PRIVKEY) &&
 683       channel->channel_key) {
 684     SilcUInt32 mac_len = silc_hmac_len(channel->hmac);
 685     SilcUInt32 iv_len = silc_cipher_get_block_len(channel->channel_key);
 686     unsigned char iv[SILC_CIPHER_MAX_IV_SIZE];
 687
 688     if (data_len <= mac_len + iv_len) {
 689       SILC_LOG_WARNING(("Corrupted channel message, cannot relay it"));
 690       return FALSE;
 691     }
 692
 693     memcpy(iv, data + (data_len - iv_len), iv_len);
 694     silc_channel_message_payload_encrypt(data, data_len - iv_len - mac_len,
 695                                          data_len, iv, iv_len,
 696                                          channel->channel_key, channel->hmac);
 697   }
 698
 699   return TRUE;
 700 }
 701
 702 /* This routine is explicitly used to relay messages to some channel.
 703    Packets sent with this function we have received earlier and are
 704    totally encrypted. This just sends the packet to all clients on
 705    the channel. If the sender of the packet is someone on the channel
 706    the message will not be sent to that client. The SILC Packet header
 707    is encrypted with the session key shared between us and the client.
 708    MAC is also computed before encrypting the header. Rest of the
 709    packet will be untouched. */
 710
 711 void silc_server_packet_relay_to_channel(SilcServer server,
 712                                          SilcSocketConnection sender_sock,
 713                                          SilcChannelEntry channel,
 714                                          void *sender_id,
 715                                          SilcIdType sender_type,
 716                                          SilcClientEntry sender_entry,
 717                                          unsigned char *data,
 718                                          SilcUInt32 data_len,
 719                                          bool force_send)
 720 {
 721   SilcSocketConnection sock = NULL;
 722   SilcPacketContext packetdata;
 723   SilcClientEntry client = NULL;
 724   SilcServerEntry *routed = NULL;
 725   SilcChannelClientEntry chl, chl_sender;
 726   SilcUInt32 routed_count = 0;
 727   SilcIDListData idata;
 728   SilcHashTableList htl;
 729   bool gone = FALSE;
 730   int k;
 731
 732   SILC_LOG_DEBUG(("Relaying packet to channel"));
 733
 734   if (!silc_server_client_on_channel(sender_entry, channel, &chl_sender))
 735     return;
 736
 737   /* This encrypts the packet, if needed. It will be encrypted if
 738      it came from the router thus it needs to be encrypted with the
 739      channel key. If the channel key does not exist, then we know we
 740      don't have a single local user on the channel. */
 741   if (!silc_server_packet_relay_to_channel_encrypt(server, sender_sock,
 742                                                    channel, data,
 743                                                    data_len))
 744     return;
 745
 746   /* Set the packet context pointers. */
 747   packetdata.flags = 0;
 748   packetdata.type = SILC_PACKET_CHANNEL_MESSAGE;
 749   packetdata.src_id = silc_id_id2str(sender_id, sender_type);
 750   packetdata.src_id_len = silc_id_get_len(sender_id, sender_type);
 751   packetdata.src_id_type = sender_type;
 752   packetdata.dst_id = silc_id_id2str(channel->id, SILC_ID_CHANNEL);
 753   packetdata.dst_id_len = silc_id_get_len(channel->id, SILC_ID_CHANNEL);
 754   packetdata.dst_id_type = SILC_ID_CHANNEL;
 755
 756   /* If there are global users in the channel we will send the message
 757      first to our router for further routing. */
 758   if (server->server_type != SILC_ROUTER && !server->standalone &&
 759       channel->global_users) {
 760     SilcServerEntry router = server->router;
 761
 762     /* Check that the sender is not our router. */
 763     if (sender_sock != (SilcSocketConnection)router->connection) {
 764
 765       /* Get data used in packet header encryption, keys and stuff. */
 766       sock = (SilcSocketConnection)router->connection;
 767       idata = (SilcIDListData)router;
 768
 769       SILC_LOG_DEBUG(("Sending channel message to router for routing"));
 770
 771       silc_server_packet_send_to_channel_real(server, sock, &packetdata,
 772                                               idata->send_key,
 773                                               idata->hmac_send,
 774                                               idata->psn_send++,
 775                                               data, data_len, TRUE,
 776                                               force_send);
 777     }
 778   }
 779
 780   routed = silc_calloc(silc_hash_table_count(channel->user_list),
 781                        sizeof(*routed));
 782
 783   /* Assure we won't route the message back to the sender's way. */
 784   if (sender_entry->router)
 785     routed[routed_count++] = sender_entry->router;
 786
 787   /* Send the message to clients on the channel's client list. */
 788   silc_hash_table_list(channel->user_list, &htl);
 789   while (silc_hash_table_get(&htl, NULL, (void *)&chl)) {
 790     client = chl->client;
 791     if (!client || client == sender_entry)
 792       continue;
 793
 794     /* Check whether message sending is blocked */
 795     if (chl->mode & SILC_CHANNEL_UMODE_BLOCK_MESSAGES)
 796       continue;
 797     if (chl->mode & SILC_CHANNEL_UMODE_BLOCK_MESSAGES_USERS &&
 798         !(chl_sender->mode & SILC_CHANNEL_UMODE_CHANOP) &&
 799         !(chl_sender->mode & SILC_CHANNEL_UMODE_CHANFO))
 800       continue;
 801     if (chl->mode & SILC_CHANNEL_UMODE_BLOCK_MESSAGES_ROBOTS &&
 802         sender_entry->mode & SILC_UMODE_ROBOT)
 803       continue;
 804
 805     /* If the client has set router it means that it is not locally
 806        connected client and we will route the packet further. */
 807     if (server->server_type == SILC_ROUTER && client->router) {
 808
 809       /* Check if we have sent the packet to this route already */
 810       for (k = 0; k < routed_count; k++)
 811         if (routed[k] == client->router)
 812           break;
 813       if (k < routed_count)
 814         continue;
 815
 816       /* Get data used in packet header encryption, keys and stuff. */
 817       sock = (SilcSocketConnection)client->router->connection;
 818       idata = (SilcIDListData)client->router;
 819
 820       /* Check if the sender socket is the same as this client's router
 821          socket. */
 822       if (sender_sock && sock == sender_sock)
 823         continue;
 824
 825       SILC_LOG_DEBUG(("Relaying packet to client ID(%s) %s (%s)",
 826                       silc_id_render(client->id, SILC_ID_CLIENT),
 827                       sock->hostname, sock->ip));
 828
 829       /* Mark this route routed already. */
 830       routed[routed_count++] = client->router;
 831
 832       if (sock->type == SILC_SOCKET_TYPE_ROUTER) {
 833         /* The remote connection is router then we'll decrypt the
 834            channel message and re-encrypt it with the session key shared
 835            between us and the remote router. This is done because the
 836            channel keys are cell specific and we have different channel
 837            key than the remote router has. */
 838
 839         /* Route only once to router. Protocol prohibits sending channel
 840            messages to more than one router. */
 841         if (gone)
 842           continue;
 843         gone = TRUE;
 844
 845         SILC_LOG_DEBUG(("Remote is router, encrypt with session key"));
 846
 847         /* If private key mode is not set then decrypt the packet
 848            and re-encrypt it */
 849         if (!(channel->mode & SILC_CHANNEL_MODE_PRIVKEY) &&
 850             channel->channel_key) {
 851           unsigned char tmp[SILC_PACKET_MAX_LEN];
 852
 853           if (data_len > SILC_PACKET_MAX_LEN)
 854             data_len = SILC_PACKET_MAX_LEN;
 855           memcpy(tmp, data, data_len);
 856
 857           /* Decrypt the channel message (we don't check the MAC) */
 858           silc_channel_message_payload_decrypt(tmp, data_len,
 859                                                channel->channel_key, NULL);
 860
 861           /* Now re-encrypt and send it to the router */
 862           silc_server_packet_send_srcdest(server, sock,
 863                                           SILC_PACKET_CHANNEL_MESSAGE, 0,
 864                                           sender_id, sender_type,
 865                                           channel->id, SILC_ID_CHANNEL,
 866                                           tmp, data_len, force_send);
 867         } else {
 868           /* Private key mode is set, we don't have the channel key, so
 869              just re-encrypt the entire packet and send it to the router. */
 870           silc_server_packet_send_srcdest(server, sock,
 871                                           SILC_PACKET_CHANNEL_MESSAGE, 0,
 872                                           sender_id, sender_type,
 873                                           channel->id, SILC_ID_CHANNEL,
 874                                           data, data_len, force_send);
 875         }
 876       } else {
 877         /* Send the packet to normal server */
 878         silc_server_packet_send_to_channel_real(server, sock, &packetdata,
 879                                                 idata->send_key,
 880                                                 idata->hmac_send,
 881                                                 idata->psn_send++,
 882                                                 data, data_len, TRUE,
 883                                                 force_send);
 884       }
 885
 886       continue;
 887     }
 888
 889     if (client->router)
 890       continue;
 891
 892     /* Get data used in packet header encryption, keys and stuff. */
 893     sock = (SilcSocketConnection)client->connection;
 894     idata = (SilcIDListData)client;
 895
 896     if (!sock || (sender_sock && sock == sender_sock))
 897       continue;
 898
 899     SILC_LOG_DEBUG(("Sending packet to client ID(%s) %s (%s)",
 900                     silc_id_render(client->id, SILC_ID_CLIENT),
 901                     sock->hostname, sock->ip));
 902
 903     /* Send the packet */
 904     silc_server_packet_send_to_channel_real(server, sock, &packetdata,
 905                                             idata->send_key,
 906                                             idata->hmac_send,
 907                                             idata->psn_send++,
 908                                             data, data_len, TRUE,
 909                                             force_send);
 910   }
 911
 912   silc_hash_table_list_reset(&htl);
 913   silc_free(routed);
 914   silc_free(packetdata.src_id);
 915   silc_free(packetdata.dst_id);
 916 }
 917
 918 /* This function is used to send packets strictly to all local clients
 919    on a particular channel.  This is used for example to distribute new
 920    channel key to all our locally connected clients on the channel.
 921    The packets are always encrypted with the session key shared between
 922    the client, this means these are not _to the channel_ but _to the client_
 923    on the channel. */
 924
 925 void silc_server_packet_send_local_channel(SilcServer server,
 926                                            SilcChannelEntry channel,
 927                                            SilcPacketType type,
 928                                            SilcPacketFlags flags,
 929                                            unsigned char *data,
 930                                            SilcUInt32 data_len,
 931                                            bool force_send)
 932 {
 933   SilcChannelClientEntry chl;
 934   SilcHashTableList htl;
 935   SilcSocketConnection sock = NULL;
 936
 937   SILC_LOG_DEBUG(("Start"));
 938
 939   /* Send the message to clients on the channel's client list. */
 940   silc_hash_table_list(channel->user_list, &htl);
 941   while (silc_hash_table_get(&htl, NULL, (void *)&chl)) {
 942     if (chl->client && !chl->client->router) {
 943       sock = (SilcSocketConnection)chl->client->connection;
 944
 945       /* Send the packet to the client */
 946       silc_server_packet_send_dest(server, sock, type, flags, chl->client->id,
 947                                    SILC_ID_CLIENT, data, data_len,
 948                                    force_send);
 949     }
 950   }
 951   silc_hash_table_list_reset(&htl);
 952 }
 953
 954 /* Routine used to send (relay, route) private messages to some destination.
 955    If the private message key does not exist then the message is re-encrypted,
 956    otherwise we just pass it along. This really is not used to send new
 957    private messages (as server does not send them) but to relay received
 958    private messages. */
 959
 960 void silc_server_send_private_message(SilcServer server,
 961                                       SilcSocketConnection dst_sock,
 962                                       SilcCipher cipher,
 963                                       SilcHmac hmac,
 964                                       SilcUInt32 sequence,
 965                                       SilcPacketContext *packet)
 966 {
 967   SilcBuffer buffer = packet->buffer;
 968   const SilcBufferStruct p;
 969
 970   silc_buffer_push(buffer, SILC_PACKET_HEADER_LEN + packet->src_id_len
 971                    + packet->dst_id_len + packet->padlen);
 972   if (!silc_packet_send_prepare(dst_sock, 0, 0, buffer->len, hmac,
 973                                 (const SilcBuffer)&p)) {
 974     SILC_LOG_ERROR(("Cannot send packet"));
 975     return;
 976   }
 977   silc_buffer_put((SilcBuffer)&p, buffer->data, buffer->len);
 978
 979   /* Re-encrypt and send if private messge key does not exist */
 980   if (!(packet->flags & SILC_PACKET_FLAG_PRIVMSG_KEY)) {
 981     /* Re-encrypt packet */
 982     silc_packet_encrypt(cipher, hmac, sequence, (SilcBuffer)&p, buffer->len);
 983   } else {
 984     /* Key exist so encrypt just header and send it */
 985     silc_packet_encrypt(cipher, hmac, sequence, (SilcBuffer)&p,
 986                         SILC_PACKET_HEADER_LEN + packet->src_id_len +
 987                         packet->dst_id_len + packet->padlen);
 988   }
 989
 990   /* Send the packet */
 991   silc_server_packet_send_real(server, dst_sock, FALSE);
 992 }
 993
 994 /* Sends current motd to client */
 995
 996 void silc_server_send_motd(SilcServer server,
 997                            SilcSocketConnection sock)
 998 {
 999   char *motd, *motd_file = NULL;
1000   SilcUInt32 motd_len;
1001
1002   if (server->config)
1003     motd_file = server->config->server_info->motd_file;
1004
1005   if (motd_file) {
1006     motd = silc_file_readfile(motd_file, &motd_len);
1007     if (!motd)
1008       return;
1009
1010     silc_server_send_notify(server, sock, FALSE, SILC_NOTIFY_TYPE_MOTD, 1,
1011                             motd, motd_len);
1012     silc_free(motd);
1013   }
1014 }
1015
1016 /* Sends error message. Error messages may or may not have any
1017    implications. */
1018
1019 void silc_server_send_error(SilcServer server,
1020                             SilcSocketConnection sock,
1021                             const char *fmt, ...)
1022 {
1023   va_list ap;
1024   unsigned char buf[4096];
1025
1026   memset(buf, 0, sizeof(buf));
1027   va_start(ap, fmt);
1028   vsprintf(buf, fmt, ap);
1029   va_end(ap);
1030
1031   silc_server_packet_send(server, sock, SILC_PACKET_ERROR, 0,
1032                           buf, strlen(buf), FALSE);
1033 }
1034
1035 /* Sends notify message. If format is TRUE the variable arguments are
1036    formatted and the formatted string is sent as argument payload. If it is
1037    FALSE then each argument is sent as separate argument and their format
1038    in the argument list must be { argument data, argument length }. */
1039
1040 void silc_server_send_notify(SilcServer server,
1041                              SilcSocketConnection sock,
1042                              bool broadcast,
1043                              SilcNotifyType type,
1044                              SilcUInt32 argc, ...)
1045 {
1046   va_list ap;
1047   SilcBuffer packet;
1048
1049   va_start(ap, argc);
1050
1051   packet = silc_notify_payload_encode(type, argc, ap);
1052   silc_server_packet_send(server, sock, SILC_PACKET_NOTIFY,
1053                           broadcast ? SILC_PACKET_FLAG_BROADCAST : 0,
1054                           packet->data, packet->len, FALSE);
1055
1056   /* Send to backup routers if this is being broadcasted to primary
1057      router. */
1058   if (server->router && server->router->connection &&
1059       sock == server->router->connection && broadcast)
1060     silc_server_backup_send(server, NULL, SILC_PACKET_NOTIFY, 0,
1061                             packet->data, packet->len, FALSE, TRUE);
1062
1063   silc_buffer_free(packet);
1064   va_end(ap);
1065 }
1066
1067 /* Sends notify message and gets the arguments from the `args' Argument
1068    Payloads. */
1069
1070 void silc_server_send_notify_args(SilcServer server,
1071                                   SilcSocketConnection sock,
1072                                   bool broadcast,
1073                                   SilcNotifyType type,
1074                                   SilcUInt32 argc,
1075                                   SilcBuffer args)
1076 {
1077   SilcBuffer packet;
1078
1079   packet = silc_notify_payload_encode_args(type, argc, args);
1080   silc_server_packet_send(server, sock, SILC_PACKET_NOTIFY,
1081                           broadcast ? SILC_PACKET_FLAG_BROADCAST : 0,
1082                           packet->data, packet->len, FALSE);
1083   silc_buffer_free(packet);
1084 }
1085
1086 /* Send CHANNEL_CHANGE notify type. This tells the receiver to replace the
1087    `old_id' with the `new_id'. */
1088
1089 void silc_server_send_notify_channel_change(SilcServer server,
1090                                             SilcSocketConnection sock,
1091                                             bool broadcast,
1092                                             SilcChannelID *old_id,
1093                                             SilcChannelID *new_id)
1094 {
1095   SilcBuffer idp1, idp2;
1096
1097   idp1 = silc_id_payload_encode((void *)old_id, SILC_ID_CHANNEL);
1098   idp2 = silc_id_payload_encode((void *)new_id, SILC_ID_CHANNEL);
1099
1100   silc_server_send_notify(server, sock, broadcast,
1101                           SILC_NOTIFY_TYPE_CHANNEL_CHANGE,
1102                           2, idp1->data, idp1->len, idp2->data, idp2->len);
1103   silc_buffer_free(idp1);
1104   silc_buffer_free(idp2);
1105 }
1106
1107 /* Send NICK_CHANGE notify type. This tells the receiver to replace the
1108    `old_id' with the `new_id'. */
1109
1110 void silc_server_send_notify_nick_change(SilcServer server,
1111                                          SilcSocketConnection sock,
1112                                          bool broadcast,
1113                                          SilcClientID *old_id,
1114                                          SilcClientID *new_id,
1115                                          const char *nickname)
1116 {
1117   SilcBuffer idp1, idp2;
1118
1119   idp1 = silc_id_payload_encode((void *)old_id, SILC_ID_CLIENT);
1120   idp2 = silc_id_payload_encode((void *)new_id, SILC_ID_CLIENT);
1121
1122   silc_server_send_notify(server, sock, broadcast,
1123                           SILC_NOTIFY_TYPE_NICK_CHANGE,
1124                           3, idp1->data, idp1->len, idp2->data, idp2->len,
1125                           nickname, nickname ? strlen(nickname) : 0);
1126   silc_buffer_free(idp1);
1127   silc_buffer_free(idp2);
1128 }
1129
1130 /* Sends JOIN notify type. This tells that new client by `client_id' ID
1131    has joined to the `channel'. */
1132
1133 void silc_server_send_notify_join(SilcServer server,
1134                                   SilcSocketConnection sock,
1135                                   bool broadcast,
1136                                   SilcChannelEntry channel,
1137                                   SilcClientID *client_id)
1138 {
1139   SilcBuffer idp1, idp2;
1140
1141   idp1 = silc_id_payload_encode((void *)client_id, SILC_ID_CLIENT);
1142   idp2 = silc_id_payload_encode((void *)channel->id, SILC_ID_CHANNEL);
1143   silc_server_send_notify(server, sock, broadcast, SILC_NOTIFY_TYPE_JOIN,
1144                           2, idp1->data, idp1->len,
1145                           idp2->data, idp2->len);
1146   silc_buffer_free(idp1);
1147   silc_buffer_free(idp2);
1148 }
1149
1150 /* Sends LEAVE notify type. This tells that `client_id' has left the
1151    `channel'. The Notify packet is always destined to the channel. */
1152
1153 void silc_server_send_notify_leave(SilcServer server,
1154                                    SilcSocketConnection sock,
1155                                    bool broadcast,
1156                                    SilcChannelEntry channel,
1157                                    SilcClientID *client_id)
1158 {
1159   SilcBuffer idp;
1160
1161   idp = silc_id_payload_encode((void *)client_id, SILC_ID_CLIENT);
1162   silc_server_send_notify_dest(server, sock, broadcast, (void *)channel->id,
1163                                SILC_ID_CHANNEL, SILC_NOTIFY_TYPE_LEAVE,
1164                                1, idp->data, idp->len);
1165   silc_buffer_free(idp);
1166 }
1167
1168 /* Sends CMODE_CHANGE notify type. This tells that `client_id' changed the
1169    `channel' mode to `mode. The Notify packet is always destined to
1170    the channel. */
1171
1172 void silc_server_send_notify_cmode(SilcServer server,
1173                                    SilcSocketConnection sock,
1174                                    bool broadcast,
1175                                    SilcChannelEntry channel,
1176                                    SilcUInt32 mode_mask,
1177                                    void *id, SilcIdType id_type,
1178                                    const char *cipher, const char *hmac,
1179                                    const char *passphrase,
1180                                    SilcPublicKey founder_key)
1181 {
1182   SilcBuffer idp;
1183   unsigned char mode[4], *key = NULL;
1184   SilcUInt32 key_len = 0;
1185
1186   idp = silc_id_payload_encode((void *)id, id_type);
1187   SILC_PUT32_MSB(mode_mask, mode);
1188   if (founder_key)
1189     key = silc_pkcs_public_key_encode(founder_key, &key_len);
1190
1191   silc_server_send_notify_dest(server, sock, broadcast, (void *)channel->id,
1192                                SILC_ID_CHANNEL, SILC_NOTIFY_TYPE_CMODE_CHANGE,
1193                                5, idp->data, idp->len,
1194                                mode, 4,
1195                                cipher, cipher ? strlen(cipher) : 0,
1196                                hmac, hmac ? strlen(hmac) : 0,
1197                                passphrase, passphrase ?
1198                                strlen(passphrase) : 0,
1199                                key, key_len);
1200   silc_free(key);
1201   silc_buffer_free(idp);
1202 }
1203
1204 /* Sends CUMODE_CHANGE notify type. This tells that `id' changed the
1205    `target' client's mode on `channel'. The notify packet is always
1206    destined to the channel. */
1207
1208 void silc_server_send_notify_cumode(SilcServer server,
1209                                     SilcSocketConnection sock,
1210                                     bool broadcast,
1211                                     SilcChannelEntry channel,
1212                                     SilcUInt32 mode_mask,
1213                                     void *id, SilcIdType id_type,
1214                                     SilcClientID *target)
1215 {
1216   SilcBuffer idp1, idp2;
1217   unsigned char mode[4];
1218
1219   idp1 = silc_id_payload_encode((void *)id, id_type);
1220   idp2 = silc_id_payload_encode((void *)target, SILC_ID_CLIENT);
1221   SILC_PUT32_MSB(mode_mask, mode);
1222
1223   silc_server_send_notify_dest(server, sock, broadcast, (void *)channel->id,
1224                                SILC_ID_CHANNEL,
1225                                SILC_NOTIFY_TYPE_CUMODE_CHANGE, 3,
1226                                idp1->data, idp1->len,
1227                                mode, 4,
1228                                idp2->data, idp2->len);
1229   silc_buffer_free(idp1);
1230   silc_buffer_free(idp2);
1231 }
1232
1233 /* Sends SIGNOFF notify type. This tells that `client_id' client has
1234    left SILC network. This function is used only between server and router
1235    traffic. This is not used to send the notify to the channel for
1236    client. The `message may be NULL. */
1237
1238 void silc_server_send_notify_signoff(SilcServer server,
1239                                      SilcSocketConnection sock,
1240                                      bool broadcast,
1241                                      SilcClientID *client_id,
1242                                      const char *message)
1243 {
1244   SilcBuffer idp;
1245
1246   idp = silc_id_payload_encode((void *)client_id, SILC_ID_CLIENT);
1247   silc_server_send_notify(server, sock, broadcast,
1248                           SILC_NOTIFY_TYPE_SIGNOFF,
1249                           message ? 2 : 1, idp->data, idp->len,
1250                           message, message ? strlen(message): 0);
1251   silc_buffer_free(idp);
1252 }
1253
1254 /* Sends TOPIC_SET notify type. This tells that `id' changed
1255    the `channel's topic to `topic'. The Notify packet is always destined
1256    to the channel. This function is used to send the topic set notifies
1257    between routers. */
1258
1259 void silc_server_send_notify_topic_set(SilcServer server,
1260                                        SilcSocketConnection sock,
1261                                        bool broadcast,
1262                                        SilcChannelEntry channel,
1263                                        void *id, SilcIdType id_type,
1264                                        char *topic)
1265 {
1266   SilcBuffer idp;
1267
1268   idp = silc_id_payload_encode(id, id_type);
1269   silc_server_send_notify_dest(server, sock, broadcast,
1270                                (void *)channel->id, SILC_ID_CHANNEL,
1271                                SILC_NOTIFY_TYPE_TOPIC_SET,
1272                                topic ? 2 : 1,
1273                                idp->data, idp->len,
1274                                topic, topic ? strlen(topic) : 0);
1275   silc_buffer_free(idp);
1276 }
1277
1278 /* Send KICKED notify type. This tells that the `client_id' on `channel'
1279    was kicked off the channel.  The `comment' may indicate the reason
1280    for the kicking. This function is used only between server and router
1281    traffic. */
1282
1283 void silc_server_send_notify_kicked(SilcServer server,
1284                                     SilcSocketConnection sock,
1285                                     bool broadcast,
1286                                     SilcChannelEntry channel,
1287                                     SilcClientID *client_id,
1288                                     SilcClientID *kicker,
1289                                     char *comment)
1290 {
1291   SilcBuffer idp1;
1292   SilcBuffer idp2;
1293
1294   idp1 = silc_id_payload_encode((void *)client_id, SILC_ID_CLIENT);
1295   idp2 = silc_id_payload_encode((void *)kicker, SILC_ID_CLIENT);
1296   silc_server_send_notify_dest(server, sock, broadcast, (void *)channel->id,
1297                                SILC_ID_CHANNEL, SILC_NOTIFY_TYPE_KICKED, 3,
1298                                idp1->data, idp1->len,
1299                                comment, comment ? strlen(comment) : 0,
1300                                idp2->data, idp2->len);
1301   silc_buffer_free(idp1);
1302   silc_buffer_free(idp2);
1303 }
1304
1305 /* Send KILLED notify type. This tells that the `client_id' client was
1306    killed from the network.  The `comment' may indicate the reason
1307    for the killing. */
1308
1309 void silc_server_send_notify_killed(SilcServer server,
1310                                     SilcSocketConnection sock,
1311                                     bool broadcast,
1312                                     SilcClientID *client_id,
1313                                     const char *comment,
1314                                     void *killer, SilcIdType killer_type)
1315 {
1316   SilcBuffer idp1;
1317   SilcBuffer idp2;
1318
1319   idp1 = silc_id_payload_encode(client_id, SILC_ID_CLIENT);
1320   idp2 = silc_id_payload_encode(killer, killer_type);
1321   silc_server_send_notify_dest(server, sock, broadcast, (void *)client_id,
1322                                SILC_ID_CLIENT, SILC_NOTIFY_TYPE_KILLED,
1323                                3, idp1->data, idp1->len,
1324                                comment, comment ? strlen(comment) : 0,
1325                                idp2->data, idp2->len);
1326   silc_buffer_free(idp1);
1327   silc_buffer_free(idp2);
1328 }
1329
1330 /* Sends UMODE_CHANGE notify type. This tells that `client_id' client's
1331    user mode in the SILC Network was changed. This function is used to
1332    send the packet between routers as broadcast packet. */
1333
1334 void silc_server_send_notify_umode(SilcServer server,
1335                                    SilcSocketConnection sock,
1336                                    bool broadcast,
1337                                    SilcClientID *client_id,
1338                                    SilcUInt32 mode_mask)
1339 {
1340   SilcBuffer idp;
1341   unsigned char mode[4];
1342
1343   idp = silc_id_payload_encode((void *)client_id, SILC_ID_CLIENT);
1344   SILC_PUT32_MSB(mode_mask, mode);
1345
1346   silc_server_send_notify(server, sock, broadcast,
1347                           SILC_NOTIFY_TYPE_UMODE_CHANGE, 2,
1348                           idp->data, idp->len,
1349                           mode, 4);
1350   silc_buffer_free(idp);
1351 }
1352
1353 /* Sends BAN notify type. This tells that ban has been either `add'ed
1354    or `del'eted on the `channel. This function is used to send the packet
1355    between routers as broadcast packet. */
1356
1357 void silc_server_send_notify_ban(SilcServer server,
1358                                  SilcSocketConnection sock,
1359                                  bool broadcast,
1360                                  SilcChannelEntry channel,
1361                                  char *add, char *del)
1362 {
1363   SilcBuffer idp;
1364
1365   idp = silc_id_payload_encode((void *)channel->id, SILC_ID_CHANNEL);
1366   silc_server_send_notify(server, sock, broadcast,
1367                           SILC_NOTIFY_TYPE_BAN, 3,
1368                           idp->data, idp->len,
1369                           add, add ? strlen(add) : 0,
1370                           del, del ? strlen(del) : 0);
1371   silc_buffer_free(idp);
1372 }
1373
1374 /* Sends INVITE notify type. This tells that invite has been either `add'ed
1375    or `del'eted on the `channel.  The sender of the invite is the `client_id'.
1376    This function is used to send the packet between routers as broadcast
1377    packet. */
1378
1379 void silc_server_send_notify_invite(SilcServer server,
1380                                     SilcSocketConnection sock,
1381                                     bool broadcast,
1382                                     SilcChannelEntry channel,
1383                                     SilcClientID *client_id,
1384                                     char *add, char *del)
1385 {
1386   SilcBuffer idp, idp2;
1387
1388   idp = silc_id_payload_encode((void *)channel->id, SILC_ID_CHANNEL);
1389   idp2 = silc_id_payload_encode((void *)client_id, SILC_ID_CLIENT);
1390   silc_server_send_notify(server, sock, broadcast,
1391                           SILC_NOTIFY_TYPE_INVITE, 5,
1392                           idp->data, idp->len,
1393                           channel->channel_name, strlen(channel->channel_name),
1394                           idp2->data, idp2->len,
1395                           add, add ? strlen(add) : 0,
1396                           del, del ? strlen(del) : 0);
1397   silc_buffer_free(idp);
1398   silc_buffer_free(idp2);
1399 }
1400
1401 /* Sends WATCH notify type. This tells that the `client' was watched and
1402    its status in the network has changed. */
1403
1404 void silc_server_send_notify_watch(SilcServer server,
1405                                    SilcSocketConnection sock,
1406                                    SilcClientEntry watcher,
1407                                    SilcClientEntry client,
1408                                    const char *nickname,
1409                                    SilcNotifyType type)
1410 {
1411   SilcBuffer idp;
1412   unsigned char mode[4], n[2];
1413
1414   idp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
1415   SILC_PUT16_MSB(type, n);
1416   SILC_PUT32_MSB(client->mode, mode);
1417   silc_server_send_notify_dest(server, sock, FALSE, watcher->id,
1418                                SILC_ID_CLIENT, SILC_NOTIFY_TYPE_WATCH,
1419                                4, idp->data, idp->len,
1420                                nickname, strlen(nickname),
1421                                mode, sizeof(mode),
1422                                type != SILC_NOTIFY_TYPE_NONE ?
1423                                n : NULL, sizeof(n));
1424   silc_buffer_free(idp);
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                                   SilcUInt32 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                                         SilcUInt32 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                                          SilcUInt32 argc, ...)
1490 {
1491   int k;
1492   SilcSocketConnection sock = NULL;
1493   SilcPacketContext packetdata;
1494   SilcClientEntry c;
1495   SilcClientEntry *sent_clients = NULL;
1496   SilcUInt32 sent_clients_count = 0;
1497   SilcServerEntry *routed = NULL;
1498   SilcUInt32 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   SilcUInt32 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         if (!sock)
1600           continue;
1601
1602         packetdata.dst_id = silc_id_id2str(c->id, SILC_ID_CLIENT);
1603         packetdata.dst_id_len = silc_id_get_len(c->id, SILC_ID_CLIENT);
1604         packetdata.dst_id_type = SILC_ID_CLIENT;
1605
1606         /* Send the packet */
1607         silc_server_packet_send_to_channel_real(server, sock, &packetdata,
1608                                                 idata->send_key,
1609                                                 idata->hmac_send,
1610                                                 idata->psn_send++,
1611                                                 data, data_len, FALSE,
1612                                                 force_send);
1613
1614         silc_free(packetdata.dst_id);
1615
1616         /* Make sure that we send the notify only once per client. */
1617         sent_clients = silc_realloc(sent_clients, sizeof(*sent_clients) *
1618                                     (sent_clients_count + 1));
1619         sent_clients[sent_clients_count++] = c;
1620       }
1621     }
1622     silc_hash_table_list_reset(&htl2);
1623   }
1624
1625   silc_hash_table_list_reset(&htl);
1626   silc_free(routed);
1627   silc_free(sent_clients);
1628   silc_free(packetdata.src_id);
1629   silc_buffer_free(packet);
1630   va_end(ap);
1631 }
1632
1633 /* Sends New ID Payload to remote end. The packet is used to distribute
1634    information about new registered clients, servers, channel etc. usually
1635    to routers so that they can keep these information up to date.
1636    If the argument `broadcast' is TRUE then the packet is sent as
1637    broadcast packet. */
1638
1639 void silc_server_send_new_id(SilcServer server,
1640                              SilcSocketConnection sock,
1641                              bool broadcast,
1642                              void *id, SilcIdType id_type,
1643                              SilcUInt32 id_len)
1644 {
1645   SilcBuffer idp;
1646
1647   SILC_LOG_DEBUG(("Start"));
1648
1649   idp = silc_id_payload_encode(id, id_type);
1650   silc_server_packet_send(server, sock, SILC_PACKET_NEW_ID,
1651                           broadcast ? SILC_PACKET_FLAG_BROADCAST : 0,
1652                           idp->data, idp->len, FALSE);
1653
1654   /* Send to backup routers if this is being broadcasted to primary
1655      router. */
1656   if (server->router && server->router->connection &&
1657       sock == server->router->connection && broadcast)
1658     silc_server_backup_send(server, NULL, SILC_PACKET_NEW_ID, 0,
1659                             idp->data, idp->len, FALSE, TRUE);
1660
1661   silc_buffer_free(idp);
1662 }
1663
1664 /* Send New Channel Payload to notify about newly created channel in the
1665    SILC network. Router uses this to notify other routers in the network
1666    about new channel. This packet is broadcasted by router. */
1667
1668 void silc_server_send_new_channel(SilcServer server,
1669                                   SilcSocketConnection sock,
1670                                   bool broadcast,
1671                                   char *channel_name,
1672                                   void *channel_id,
1673                                   SilcUInt32 channel_id_len,
1674                                   SilcUInt32 mode)
1675 {
1676   SilcBuffer packet;
1677   unsigned char *cid;
1678   SilcUInt32 name_len = strlen(channel_name);
1679
1680   SILC_LOG_DEBUG(("Start"));
1681
1682   cid = silc_id_id2str(channel_id, SILC_ID_CHANNEL);
1683   if (!cid)
1684     return;
1685
1686   /* Encode the channel payload */
1687   packet = silc_channel_payload_encode(channel_name, name_len,
1688                                        cid, channel_id_len, mode);
1689
1690   silc_server_packet_send(server, sock, SILC_PACKET_NEW_CHANNEL,
1691                           broadcast ? SILC_PACKET_FLAG_BROADCAST : 0,
1692                           packet->data, packet->len, FALSE);
1693
1694   /* Send to backup routers if this is being broadcasted to primary
1695      router. */
1696   if (server->server_type == SILC_ROUTER &&
1697       server->router && server->router->connection &&
1698       sock == server->router->connection && broadcast)
1699     silc_server_backup_send(server, NULL, SILC_PACKET_NEW_CHANNEL, 0,
1700                             packet->data, packet->len, FALSE, TRUE);
1701
1702   silc_free(cid);
1703   silc_buffer_free(packet);
1704 }
1705
1706 /* Send Channel Key payload to distribute the new channel key. Normal server
1707    sends this to router when new client joins to existing channel. Router
1708    sends this to the local server who sent the join command in case where
1709    the channel did not exist yet. Both normal and router servers uses this
1710    also to send this to locally connected clients on the channel. This
1711    must not be broadcasted packet. Routers do not send this to each other.
1712    If `sender is provided then the packet is not sent to that connection since
1713    it originally came from it. */
1714
1715 void silc_server_send_channel_key(SilcServer server,
1716                                   SilcSocketConnection sender,
1717                                   SilcChannelEntry channel,
1718                                   unsigned char route)
1719 {
1720   SilcBuffer packet;
1721   unsigned char *chid;
1722   SilcUInt32 tmp_len;
1723
1724   SILC_LOG_DEBUG(("Sending key to channel %s", channel->channel_name));
1725
1726   chid = silc_id_id2str(channel->id, SILC_ID_CHANNEL);
1727   if (!chid)
1728     return;
1729
1730   /* Encode channel key packet */
1731   tmp_len = strlen(channel->channel_key->cipher->name);
1732   packet = silc_channel_key_payload_encode(silc_id_get_len(channel->id,
1733                                                            SILC_ID_CHANNEL),
1734                                            chid, tmp_len,
1735                                            channel->channel_key->cipher->name,
1736                                            channel->key_len / 8, channel->key);
1737   silc_server_packet_send_to_channel(server, sender, channel,
1738                                      SILC_PACKET_CHANNEL_KEY,
1739                                      route, packet->data, packet->len,
1740                                      FALSE);
1741   silc_buffer_free(packet);
1742   silc_free(chid);
1743 }
1744
1745 /* Generic function to send any command. The arguments must be sent already
1746    encoded into correct form in correct order. */
1747
1748 void silc_server_send_command(SilcServer server,
1749                               SilcSocketConnection sock,
1750                               SilcCommand command,
1751                               SilcUInt16 ident,
1752                               SilcUInt32 argc, ...)
1753 {
1754   SilcBuffer packet;
1755   va_list ap;
1756
1757   va_start(ap, argc);
1758
1759   packet = silc_command_payload_encode_vap(command, ident, argc, ap);
1760   silc_server_packet_send(server, sock, SILC_PACKET_COMMAND, 0,
1761                           packet->data, packet->len, TRUE);
1762   silc_buffer_free(packet);
1763   va_end(ap);
1764 }
1765
1766 /* Generic function to send any command reply. The arguments must be sent
1767    already encoded into correct form in correct order. */
1768
1769 void silc_server_send_command_reply(SilcServer server,
1770                                     SilcSocketConnection sock,
1771                                     SilcCommand command,
1772                                     SilcStatus status,
1773                                     SilcStatus error,
1774                                     SilcUInt16 ident,
1775                                     SilcUInt32 argc, ...)
1776 {
1777   SilcBuffer packet;
1778   va_list ap;
1779
1780   va_start(ap, argc);
1781
1782   packet = silc_command_reply_payload_encode_vap(command, status, error,
1783                                                  ident, argc, ap);
1784   silc_server_packet_send(server, sock, SILC_PACKET_COMMAND_REPLY, 0,
1785                           packet->data, packet->len, TRUE);
1786   silc_buffer_free(packet);
1787   va_end(ap);
1788 }
1789
1790 /* Generic function to send any command reply. The arguments must be sent
1791    already encoded into correct form in correct order. */
1792
1793 void silc_server_send_dest_command_reply(SilcServer server,
1794                                          SilcSocketConnection sock,
1795                                          void *dst_id,
1796                                          SilcIdType dst_id_type,
1797                                          SilcCommand command,
1798                                          SilcStatus status,
1799                                          SilcStatus error,
1800                                          SilcUInt16 ident,
1801                                          SilcUInt32 argc, ...)
1802 {
1803   SilcBuffer packet;
1804   va_list ap;
1805
1806   va_start(ap, argc);
1807
1808   packet = silc_command_reply_payload_encode_vap(command, status, error,
1809                                                  ident, argc, ap);
1810   silc_server_packet_send_dest(server, sock, SILC_PACKET_COMMAND_REPLY, 0,
1811                                dst_id, dst_id_type, packet->data,
1812                                packet->len, TRUE);
1813   silc_buffer_free(packet);
1814   va_end(ap);
1815 }
1816
1817 /* Send the heartbeat packet. */
1818
1819 void silc_server_send_heartbeat(SilcServer server,
1820                                 SilcSocketConnection sock)
1821 {
1822   silc_server_packet_send(server, sock, SILC_PACKET_HEARTBEAT, 0,
1823                           NULL, 0, FALSE);
1824 }
1825
1826 /* Generic function to relay packet we've received. This is used to relay
1827    packets to a client but generally can be used to other purposes as well. */
1828
1829 void silc_server_relay_packet(SilcServer server,
1830                               SilcSocketConnection dst_sock,
1831                               SilcCipher cipher,
1832                               SilcHmac hmac,
1833                               SilcUInt32 sequence,
1834                               SilcPacketContext *packet,
1835                               bool force_send)
1836 {
1837   const SilcBufferStruct p;
1838
1839   silc_buffer_push(packet->buffer, SILC_PACKET_HEADER_LEN + packet->src_id_len
1840                    + packet->dst_id_len + packet->padlen);
1841   if (!silc_packet_send_prepare(dst_sock, 0, 0, packet->buffer->len, hmac,
1842                                 (const SilcBuffer)&p)) {
1843     SILC_LOG_ERROR(("Cannot send packet"));
1844     return;
1845   }
1846   silc_buffer_put((SilcBuffer)&p, packet->buffer->data, packet->buffer->len);
1847
1848   /* Re-encrypt packet */
1849   silc_packet_encrypt(cipher, hmac, sequence, (SilcBuffer)&p, p.len);
1850
1851   /* Send the packet */
1852   silc_server_packet_send_real(server, dst_sock, force_send);
1853
1854   silc_buffer_pull(packet->buffer, SILC_PACKET_HEADER_LEN + packet->src_id_len
1855                    + packet->dst_id_len + packet->padlen);
1856 }
1857
1858 /* Routine used to send the connection authentication packet. */
1859
1860 void silc_server_send_connection_auth_request(SilcServer server,
1861                                               SilcSocketConnection sock,
1862                                               SilcUInt16 conn_type,
1863                                               SilcAuthMethod auth_meth)
1864 {
1865   SilcBuffer packet;
1866
1867   packet = silc_buffer_alloc(4);
1868   silc_buffer_pull_tail(packet, SILC_BUFFER_END(packet));
1869   silc_buffer_format(packet,
1870                      SILC_STR_UI_SHORT(conn_type),
1871                      SILC_STR_UI_SHORT(auth_meth),
1872                      SILC_STR_END);
1873
1874   silc_server_packet_send(server, sock, SILC_PACKET_CONNECTION_AUTH_REQUEST,
1875                           0, packet->data, packet->len, FALSE);
1876   silc_buffer_free(packet);
1877 }
1878
1879 /* Purge the outgoing packet queue to the network if there is data. This
1880    function can be used to empty the packet queue. It is guaranteed that
1881    after this function returns the outgoing data queue is empty. */
1882
1883 void silc_server_packet_queue_purge(SilcServer server,
1884                                     SilcSocketConnection sock)
1885 {
1886   if (sock && SILC_IS_OUTBUF_PENDING(sock) &&
1887       (SILC_IS_DISCONNECTED(sock) == FALSE)) {
1888     server->stat.packets_sent++;
1889     silc_packet_send(sock, TRUE);
1890     SILC_SET_CONNECTION_FOR_INPUT(server->schedule, sock->sock);
1891     SILC_UNSET_OUTBUF_PENDING(sock);
1892     silc_buffer_clear(sock->outbuf);
1893   }
1894 }