5 Author: Pekka Riikonen <priikone@poseidon.pspt.fi>
7 Copyright (C) 1997 - 2001 Pekka Riikonen
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.
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.
21 * Server packet routines to send packets.
25 #include "serverincludes.h"
26 #include "server_internal.h"
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. */
32 int silc_server_packet_send_real(SilcServer server,
33 SilcSocketConnection sock,
39 ret = silc_packet_send(sock, force_send);
43 /* Mark that there is some outgoing data available for this connection.
44 This call sets the connection both for input and output (the input
45 is set always and this call keeps the input setting, actually).
46 Actual data sending is performed by silc_server_packet_process. */
47 SILC_SET_CONNECTION_FOR_OUTPUT(sock->sock);
49 /* Mark to socket that data is pending in outgoing buffer. This flag
50 is needed if new data is added to the buffer before the earlier
51 put data is sent to the network. */
52 SILC_SET_OUTBUF_PENDING(sock);
57 /* Assembles a new packet to be sent out to network. This doesn't actually
58 send the packet but creates the packet and fills the outgoing data
59 buffer and marks the packet ready to be sent to network. However, If
60 argument force_send is TRUE the packet is sent immediately and not put
61 to queue. Normal case is that the packet is not sent immediately. */
63 void silc_server_packet_send(SilcServer server,
64 SilcSocketConnection sock,
66 SilcPacketFlags flags,
68 unsigned int data_len,
72 SilcIdType dst_id_type = SILC_ID_NONE;
77 /* Get data used in the packet sending, keys and stuff */
79 case SILC_SOCKET_TYPE_CLIENT:
80 dst_id = ((SilcClientEntry)sock->user_data)->id;
81 dst_id_type = SILC_ID_CLIENT;
83 case SILC_SOCKET_TYPE_SERVER:
84 case SILC_SOCKET_TYPE_ROUTER:
85 dst_id = ((SilcServerEntry)sock->user_data)->id;
86 dst_id_type = SILC_ID_SERVER;
92 silc_server_packet_send_dest(server, sock, type, flags, dst_id,
93 dst_id_type, data, data_len, force_send);
96 /* Assembles a new packet to be sent out to network. This doesn't actually
97 send the packet but creates the packet and fills the outgoing data
98 buffer and marks the packet ready to be sent to network. However, If
99 argument force_send is TRUE the packet is sent immediately and not put
100 to queue. Normal case is that the packet is not sent immediately.
101 Destination information is sent as argument for this function. */
103 void silc_server_packet_send_dest(SilcServer server,
104 SilcSocketConnection sock,
106 SilcPacketFlags flags,
108 SilcIdType dst_id_type,
110 unsigned int data_len,
113 SilcPacketContext packetdata;
114 SilcIDListData idata;
115 SilcCipher cipher = NULL;
116 SilcHmac hmac = NULL;
117 unsigned char *dst_id_data = NULL;
118 unsigned int dst_id_len = 0;
120 SILC_LOG_DEBUG(("Sending packet, type %d", type));
122 /* Get data used in the packet sending, keys and stuff */
123 idata = (SilcIDListData)sock->user_data;
126 dst_id_data = silc_id_id2str(dst_id, dst_id_type);
127 dst_id_len = silc_id_get_len(dst_id_type);
130 /* Set the packet context pointers */
131 packetdata.type = type;
132 packetdata.flags = flags;
133 packetdata.src_id = silc_id_id2str(server->id, server->id_type);
134 packetdata.src_id_len = SILC_ID_SERVER_LEN;
135 packetdata.src_id_type = server->id_type;
136 packetdata.dst_id = dst_id_data;
137 packetdata.dst_id_len = dst_id_len;
138 packetdata.dst_id_type = dst_id_type;
139 packetdata.truelen = data_len + SILC_PACKET_HEADER_LEN +
140 packetdata.src_id_len + dst_id_len;
141 packetdata.padlen = SILC_PACKET_PADLEN(packetdata.truelen);
143 /* Prepare outgoing data buffer for packet sending */
144 silc_packet_send_prepare(sock,
145 SILC_PACKET_HEADER_LEN +
146 packetdata.src_id_len +
147 packetdata.dst_id_len,
151 SILC_LOG_DEBUG(("Putting data to outgoing buffer, len %d", data_len));
153 packetdata.buffer = sock->outbuf;
155 /* Put the data to the buffer */
156 if (data && data_len)
157 silc_buffer_put(sock->outbuf, data, data_len);
159 /* Create the outgoing packet */
160 silc_packet_assemble(&packetdata);
163 cipher = idata->send_key;
167 /* Encrypt the packet */
168 silc_packet_encrypt(cipher, hmac, sock->outbuf, sock->outbuf->len);
170 SILC_LOG_HEXDUMP(("Outgoing packet, len %d", sock->outbuf->len),
171 sock->outbuf->data, sock->outbuf->len);
173 /* Now actually send the packet */
174 silc_server_packet_send_real(server, sock, force_send);
176 if (packetdata.src_id)
177 silc_free(packetdata.src_id);
178 if (packetdata.dst_id)
179 silc_free(packetdata.dst_id);
182 /* Assembles a new packet to be sent out to network. This doesn't actually
183 send the packet but creates the packet and fills the outgoing data
184 buffer and marks the packet ready to be sent to network. However, If
185 argument force_send is TRUE the packet is sent immediately and not put
186 to queue. Normal case is that the packet is not sent immediately.
187 The source and destination information is sent as argument for this
190 void silc_server_packet_send_srcdest(SilcServer server,
191 SilcSocketConnection sock,
193 SilcPacketFlags flags,
195 SilcIdType src_id_type,
197 SilcIdType dst_id_type,
199 unsigned int data_len,
202 SilcPacketContext packetdata;
203 SilcIDListData idata;
204 SilcCipher cipher = NULL;
205 SilcHmac hmac = NULL;
206 unsigned char *dst_id_data = NULL;
207 unsigned int dst_id_len = 0;
208 unsigned char *src_id_data = NULL;
209 unsigned int src_id_len = 0;
211 SILC_LOG_DEBUG(("Sending packet, type %d", type));
213 /* Get data used in the packet sending, keys and stuff */
214 idata = (SilcIDListData)sock->user_data;
217 dst_id_data = silc_id_id2str(dst_id, dst_id_type);
218 dst_id_len = silc_id_get_len(dst_id_type);
222 src_id_data = silc_id_id2str(src_id, src_id_type);
223 src_id_len = silc_id_get_len(src_id_type);
226 /* Set the packet context pointers */
227 packetdata.type = type;
228 packetdata.flags = flags;
229 packetdata.src_id = src_id_data;
230 packetdata.src_id_len = src_id_len;
231 packetdata.src_id_type = src_id_type;
232 packetdata.dst_id = dst_id_data;
233 packetdata.dst_id_len = dst_id_len;
234 packetdata.dst_id_type = dst_id_type;
235 packetdata.truelen = data_len + SILC_PACKET_HEADER_LEN +
236 packetdata.src_id_len + dst_id_len;
237 packetdata.padlen = SILC_PACKET_PADLEN(packetdata.truelen);
239 /* Prepare outgoing data buffer for packet sending */
240 silc_packet_send_prepare(sock,
241 SILC_PACKET_HEADER_LEN +
242 packetdata.src_id_len +
243 packetdata.dst_id_len,
247 SILC_LOG_DEBUG(("Putting data to outgoing buffer, len %d", data_len));
249 packetdata.buffer = sock->outbuf;
251 /* Put the data to the buffer */
252 if (data && data_len)
253 silc_buffer_put(sock->outbuf, data, data_len);
255 /* Create the outgoing packet */
256 silc_packet_assemble(&packetdata);
259 cipher = idata->send_key;
263 /* Encrypt the packet */
264 silc_packet_encrypt(cipher, hmac, sock->outbuf, sock->outbuf->len);
266 SILC_LOG_HEXDUMP(("Outgoing packet, len %d", sock->outbuf->len),
267 sock->outbuf->data, sock->outbuf->len);
269 /* Now actually send the packet */
270 silc_server_packet_send_real(server, sock, force_send);
272 if (packetdata.src_id)
273 silc_free(packetdata.src_id);
274 if (packetdata.dst_id)
275 silc_free(packetdata.dst_id);
278 /* Broadcast received packet to our primary route. This function is used
279 by router to further route received broadcast packet. It is expected
280 that the broadcast flag from the packet is checked before calling this
281 function. This does not test or set the broadcast flag. */
283 void silc_server_packet_broadcast(SilcServer server,
284 SilcSocketConnection sock,
285 SilcPacketContext *packet)
287 SilcBuffer buffer = packet->buffer;
288 SilcIDListData idata;
291 SILC_LOG_DEBUG(("Broadcasting received broadcast packet"));
293 /* If the packet is originated from our primary route we are
294 not allowed to send the packet. */
295 id = silc_id_str2id(packet->src_id, packet->src_id_len, packet->src_id_type);
296 if (id && SILC_ID_SERVER_COMPARE(id, server->router->id)) {
297 idata = (SilcIDListData)sock->user_data;
299 silc_buffer_push(buffer, buffer->data - buffer->head);
300 silc_packet_send_prepare(sock, 0, 0, buffer->len);
301 silc_buffer_put(sock->outbuf, buffer->data, buffer->len);
302 silc_packet_encrypt(idata->send_key, idata->hmac,
303 sock->outbuf, sock->outbuf->len);
305 SILC_LOG_HEXDUMP(("Broadcasted packet, len %d", sock->outbuf->len),
306 sock->outbuf->data, sock->outbuf->len);
308 /* Now actually send the packet */
309 silc_server_packet_send_real(server, sock, TRUE);
314 SILC_LOG_DEBUG(("Will not broadcast to primary route since it is the "
315 "original sender of this packet"));
319 /* Routes received packet to `sock'. This is used to route the packets that
320 router receives but are not destined to it. */
322 void silc_server_packet_route(SilcServer server,
323 SilcSocketConnection sock,
324 SilcPacketContext *packet)
326 SilcBuffer buffer = packet->buffer;
327 SilcIDListData idata;
329 SILC_LOG_DEBUG(("Routing received packet"));
331 idata = (SilcIDListData)sock->user_data;
333 silc_buffer_push(buffer, buffer->data - buffer->head);
334 silc_packet_send_prepare(sock, 0, 0, buffer->len);
335 silc_buffer_put(sock->outbuf, buffer->data, buffer->len);
336 silc_packet_encrypt(idata->send_key, idata->hmac,
337 sock->outbuf, sock->outbuf->len);
339 SILC_LOG_HEXDUMP(("Routed packet, len %d", sock->outbuf->len),
340 sock->outbuf->data, sock->outbuf->len);
342 /* Now actually send the packet */
343 silc_server_packet_send_real(server, sock, TRUE);
346 /* Internal routine to actually create the channel packet and send it
347 to network. This is common function in channel message sending. If
348 `channel_message' is TRUE this encrypts the message as it is strictly
349 a channel message. If FALSE normal encryption process is used. */
352 silc_server_packet_send_to_channel_real(SilcServer server,
353 SilcSocketConnection sock,
354 SilcPacketContext *packet,
358 unsigned int data_len,
362 packet->truelen = data_len + SILC_PACKET_HEADER_LEN +
363 packet->src_id_len + packet->dst_id_len;
365 /* Prepare outgoing data buffer for packet sending */
366 silc_packet_send_prepare(sock,
367 SILC_PACKET_HEADER_LEN +
373 packet->buffer = sock->outbuf;
375 /* Put the data to buffer, assemble and encrypt the packet. The packet
376 is encrypted with normal session key shared with the client. */
377 silc_buffer_put(sock->outbuf, data, data_len);
378 silc_packet_assemble(packet);
380 silc_packet_encrypt(cipher, hmac, sock->outbuf, SILC_PACKET_HEADER_LEN +
381 packet->src_id_len + packet->dst_id_len +
384 silc_packet_encrypt(cipher, hmac, sock->outbuf, sock->outbuf->len);
386 SILC_LOG_HEXDUMP(("Channel packet, len %d", sock->outbuf->len),
387 sock->outbuf->data, sock->outbuf->len);
389 /* Now actually send the packet */
390 silc_server_packet_send_real(server, sock, force_send);
393 /* This routine is used by the server to send packets to channel. The
394 packet sent with this function is distributed to all clients on
395 the channel. Usually this is used to send notify messages to the
396 channel, things like notify about new user joining to the channel.
397 If `route' is FALSE then the packet is sent only locally and will not
398 be routed anywhere (for router locally means cell wide). If `sender'
399 is provided then the packet is not sent to that connection since it
400 originally came from it. */
402 void silc_server_packet_send_to_channel(SilcServer server,
403 SilcSocketConnection sender,
404 SilcChannelEntry channel,
408 unsigned int data_len,
411 SilcSocketConnection sock = NULL;
412 SilcPacketContext packetdata;
413 SilcClientEntry client = NULL;
414 SilcServerEntry *routed = NULL;
415 SilcChannelClientEntry chl;
416 SilcIDListData idata;
417 unsigned int routed_count = 0;
419 /* This doesn't send channel message packets */
420 if (type == SILC_PACKET_CHANNEL_MESSAGE)
423 SILC_LOG_DEBUG(("Sending packet to channel"));
425 /* Set the packet context pointers. */
426 packetdata.flags = 0;
427 packetdata.type = type;
428 packetdata.src_id = silc_id_id2str(server->id, SILC_ID_SERVER);
429 packetdata.src_id_len = SILC_ID_SERVER_LEN;
430 packetdata.src_id_type = SILC_ID_SERVER;
431 packetdata.dst_id = silc_id_id2str(channel->id, SILC_ID_CHANNEL);
432 packetdata.dst_id_len = SILC_ID_CHANNEL_LEN;
433 packetdata.dst_id_type = SILC_ID_CHANNEL;
434 packetdata.truelen = data_len + SILC_PACKET_HEADER_LEN +
435 packetdata.src_id_len + packetdata.dst_id_len;
436 packetdata.padlen = SILC_PACKET_PADLEN(packetdata.truelen);
438 /* If there are global users in the channel we will send the message
439 first to our router for further routing. */
440 if (route && server->server_type == SILC_SERVER && !server->standalone &&
441 channel->global_users) {
442 SilcServerEntry router;
444 /* Get data used in packet header encryption, keys and stuff. */
445 router = server->router;
446 sock = (SilcSocketConnection)router->connection;
447 idata = (SilcIDListData)router;
449 if (sock != sender) {
450 SILC_LOG_DEBUG(("Sending channel message to router for routing"));
452 silc_server_packet_send_to_channel_real(server, sock, &packetdata,
453 idata->send_key, idata->hmac,
454 data, data_len, FALSE,
459 /* Send the message to clients on the channel's client list. */
460 silc_list_start(channel->user_list);
461 while ((chl = silc_list_get(channel->user_list)) != SILC_LIST_END) {
462 client = chl->client;
464 /* If client has router set it is not locally connected client and
465 we will route the message to the router set in the client. Though,
466 send locally connected server in all cases. */
467 if (server->server_type == SILC_ROUTER && client && client->router &&
468 ((!route && client->router->router == server->id_entry) || route)) {
471 /* Check if we have sent the packet to this route already */
472 for (k = 0; k < routed_count; k++)
473 if (routed[k] == client->router)
475 if (k < routed_count)
478 /* Get data used in packet header encryption, keys and stuff. */
479 sock = (SilcSocketConnection)client->router->connection;
480 idata = (SilcIDListData)client->router;
482 if (sender && sock == sender)
485 /* Send the packet */
486 silc_server_packet_send_to_channel_real(server, sock, &packetdata,
487 idata->send_key, idata->hmac,
488 data, data_len, FALSE,
491 /* We want to make sure that the packet is routed to same router
492 only once. Mark this route as sent route. */
494 routed = silc_realloc(routed, sizeof(*routed) * (k + 1));
495 routed[k] = client->router;
501 if (client && client->router)
504 /* Send to locally connected client */
507 /* Get data used in packet header encryption, keys and stuff. */
508 sock = (SilcSocketConnection)client->connection;
509 idata = (SilcIDListData)client;
511 if (sender && sock == sender)
514 /* Send the packet */
515 silc_server_packet_send_to_channel_real(server, sock, &packetdata,
516 idata->send_key, idata->hmac,
517 data, data_len, FALSE,
524 silc_free(packetdata.src_id);
525 silc_free(packetdata.dst_id);
528 /* This routine is explicitly used to relay messages to some channel.
529 Packets sent with this function we have received earlier and are
530 totally encrypted. This just sends the packet to all clients on
531 the channel. If the sender of the packet is someone on the channel
532 the message will not be sent to that client. The SILC Packet header
533 is encrypted with the session key shared between us and the client.
534 MAC is also computed before encrypting the header. Rest of the
535 packet will be untouched. */
537 void silc_server_packet_relay_to_channel(SilcServer server,
538 SilcSocketConnection sender_sock,
539 SilcChannelEntry channel,
541 SilcIdType sender_type,
543 unsigned int data_len,
547 SilcSocketConnection sock = NULL;
548 SilcPacketContext packetdata;
549 SilcClientEntry client = NULL;
550 SilcServerEntry *routed = NULL;
551 SilcChannelClientEntry chl;
552 unsigned int routed_count = 0;
553 SilcIDListData idata;
555 SILC_LOG_DEBUG(("Relaying packet to channel"));
557 /* Set the packet context pointers. */
558 packetdata.flags = 0;
559 packetdata.type = SILC_PACKET_CHANNEL_MESSAGE;
560 packetdata.src_id = silc_id_id2str(sender, sender_type);
561 packetdata.src_id_len = silc_id_get_len(sender_type);
562 packetdata.src_id_type = sender_type;
563 packetdata.dst_id = silc_id_id2str(channel->id, SILC_ID_CHANNEL);
564 packetdata.dst_id_len = SILC_ID_CHANNEL_LEN;
565 packetdata.dst_id_type = SILC_ID_CHANNEL;
566 packetdata.padlen = SILC_PACKET_PADLEN((SILC_PACKET_HEADER_LEN +
567 packetdata.src_id_len +
568 packetdata.dst_id_len));
570 /* If there are global users in the channel we will send the message
571 first to our router for further routing. */
572 if (server->server_type == SILC_SERVER && !server->standalone &&
573 channel->global_users) {
574 SilcServerEntry router;
576 router = server->router;
578 /* Check that the sender is not our router. */
579 if (sender_sock != (SilcSocketConnection)router->connection) {
581 /* Get data used in packet header encryption, keys and stuff. */
582 sock = (SilcSocketConnection)router->connection;
583 idata = (SilcIDListData)router;
585 SILC_LOG_DEBUG(("Sending channel message to router for routing"));
587 silc_server_packet_send_to_channel_real(server, sock, &packetdata,
588 idata->send_key, idata->hmac,
589 data, data_len, TRUE,
594 /* Send the message to clients on the channel's client list. */
595 silc_list_start(channel->user_list);
596 while ((chl = silc_list_get(channel->user_list)) != SILC_LIST_END) {
597 client = chl->client;
601 /* If sender is one on the channel do not send it the packet. */
602 if (!found && !SILC_ID_CLIENT_COMPARE(client->id, sender)) {
607 /* If the client has set router it means that it is not locally
608 connected client and we will route the packet further. */
609 if (server->server_type == SILC_ROUTER && client->router) {
612 /* Sender maybe server as well so we want to make sure that
613 we won't send the message to the server it came from. */
614 if (!found && !SILC_ID_SERVER_COMPARE(client->router->id, sender)) {
619 /* Check if we have sent the packet to this route already */
620 for (k = 0; k < routed_count; k++)
621 if (routed[k] == client->router)
623 if (k < routed_count)
626 /* Get data used in packet header encryption, keys and stuff. */
627 sock = (SilcSocketConnection)client->router->connection;
628 idata = (SilcIDListData)client->router;
630 if (sender_sock && sock == sender_sock)
633 SILC_LOG_DEBUG(("Relaying packet to client ID(%s) %s (%s)",
634 silc_id_render(client->id, SILC_ID_CLIENT),
635 sock->hostname, sock->ip));
637 /* We want to make sure that the packet is routed to same router
638 only once. Mark this route as sent route. */
640 routed = silc_realloc(routed, sizeof(*routed) * (k + 1));
641 routed[k] = client->router;
644 /* If the remote connection is router then we'll decrypt the
645 channel message and re-encrypt it with the session key shared
646 between us and the remote router. This is done because the
647 channel keys are cell specific and we have different channel
648 key than the remote router has. */
649 if (sock->type == SILC_SOCKET_TYPE_ROUTER) {
651 /* If private key mode is not set then decrypt the packet
653 if (!(channel->mode & SILC_CHANNEL_MODE_PRIVKEY)) {
654 unsigned char *tmp = silc_calloc(data_len, sizeof(*data));
655 memcpy(tmp, data, data_len);
657 /* Decrypt the channel message (we don't check the MAC) */
658 if (!silc_channel_message_payload_decrypt(tmp, data_len,
659 channel->channel_key,
661 memset(tmp, 0, data_len);
666 /* Now re-encrypt and send it to the router */
667 silc_server_packet_send_srcdest(server, sock,
668 SILC_PACKET_CHANNEL_MESSAGE, 0,
670 channel->id, SILC_ID_CHANNEL,
671 tmp, data_len, force_send);
673 /* Free the copy of the channel message */
674 memset(tmp, 0, data_len);
677 /* Private key mode is set, we don't have the channel key, so
678 just re-encrypt the entire packet and send it to the router. */
679 silc_server_packet_send_dest(server, sock,
680 SILC_PACKET_CHANNEL_MESSAGE, 0,
681 channel->id, SILC_ID_CHANNEL,
682 data, data_len, force_send);
687 /* Send the packet (to normal server) */
688 silc_server_packet_send_to_channel_real(server, sock, &packetdata,
689 idata->send_key, idata->hmac,
690 data, data_len, TRUE,
696 if (client && client->router)
699 /* Get data used in packet header encryption, keys and stuff. */
700 sock = (SilcSocketConnection)client->connection;
701 idata = (SilcIDListData)client;
703 if (sender_sock && sock == sender_sock)
706 SILC_LOG_DEBUG(("Sending packet to client ID(%s) %s (%s)",
707 silc_id_render(client->id, SILC_ID_CLIENT),
708 sock->hostname, sock->ip));
710 /* Send the packet */
711 silc_server_packet_send_to_channel_real(server, sock, &packetdata,
712 idata->send_key, idata->hmac,
713 data, data_len, TRUE,
718 silc_free(packetdata.src_id);
719 silc_free(packetdata.dst_id);
722 /* This function is used to send packets strictly to all local clients
723 on a particular channel. This is used for example to distribute new
724 channel key to all our locally connected clients on the channel.
725 The packets are always encrypted with the session key shared between
726 the client, this means these are not _to the channel_ but _to the client_
729 void silc_server_packet_send_local_channel(SilcServer server,
730 SilcChannelEntry channel,
732 SilcPacketFlags flags,
734 unsigned int data_len,
737 SilcChannelClientEntry chl;
738 SilcSocketConnection sock = NULL;
740 SILC_LOG_DEBUG(("Start"));
742 /* Send the message to clients on the channel's client list. */
743 silc_list_start(channel->user_list);
744 while ((chl = silc_list_get(channel->user_list)) != SILC_LIST_END) {
745 if (chl->client && !chl->client->router) {
746 sock = (SilcSocketConnection)chl->client->connection;
748 /* Send the packet to the client */
749 silc_server_packet_send_dest(server, sock, type, flags, chl->client->id,
750 SILC_ID_CLIENT, data, data_len,
756 /* Routine used to send (relay, route) private messages to some destination.
757 If the private message key does not exist then the message is re-encrypted,
758 otherwise we just pass it along. This really is not used to send new
759 private messages (as server does not send them) but to relay received
762 void silc_server_send_private_message(SilcServer server,
763 SilcSocketConnection dst_sock,
766 SilcPacketContext *packet)
768 SilcBuffer buffer = packet->buffer;
770 /* Re-encrypt and send if private messge key does not exist */
771 if ((packet->flags & SILC_PACKET_FLAG_PRIVMSG_KEY) == FALSE) {
773 silc_buffer_push(buffer, SILC_PACKET_HEADER_LEN + packet->src_id_len
774 + packet->dst_id_len + packet->padlen);
775 silc_packet_send_prepare(dst_sock, 0, 0, buffer->len);
776 silc_buffer_put(dst_sock->outbuf, buffer->data, buffer->len);
778 /* Re-encrypt packet */
779 silc_packet_encrypt(cipher, hmac, dst_sock->outbuf, buffer->len);
781 /* Send the packet */
782 silc_server_packet_send_real(server, dst_sock, FALSE);
785 /* Key exist so just send it */
786 silc_buffer_push(buffer, SILC_PACKET_HEADER_LEN + packet->src_id_len
787 + packet->dst_id_len + packet->padlen);
788 silc_packet_send_prepare(dst_sock, 0, 0, buffer->len);
789 silc_buffer_put(dst_sock->outbuf, buffer->data, buffer->len);
790 silc_server_packet_send_real(server, dst_sock, FALSE);
794 /* Sends current motd to client */
796 void silc_server_send_motd(SilcServer server,
797 SilcSocketConnection sock)
802 if (server->config && server->config->motd &&
803 server->config->motd->motd_file) {
805 motd = silc_file_read(server->config->motd->motd_file, &motd_len);
809 silc_server_send_notify(server, sock, FALSE, SILC_NOTIFY_TYPE_MOTD, 1,
815 /* Sends error message. Error messages may or may not have any
818 void silc_server_send_error(SilcServer server,
819 SilcSocketConnection sock,
820 const char *fmt, ...)
823 unsigned char buf[4096];
825 memset(buf, 0, sizeof(buf));
827 vsprintf(buf, fmt, ap);
830 silc_server_packet_send(server, sock, SILC_PACKET_ERROR, 0,
831 buf, strlen(buf), FALSE);
834 /* Sends notify message. If format is TRUE the variable arguments are
835 formatted and the formatted string is sent as argument payload. If it is
836 FALSE then each argument is sent as separate argument and their format
837 in the argument list must be { argument data, argument length }. */
839 void silc_server_send_notify(SilcServer server,
840 SilcSocketConnection sock,
843 unsigned int argc, ...)
850 packet = silc_notify_payload_encode(type, argc, ap);
851 silc_server_packet_send(server, sock, SILC_PACKET_NOTIFY, 0,
852 packet->data, packet->len, FALSE);
853 silc_buffer_free(packet);
856 /* Send CHANNEL_CHANGE notify type. This tells the receiver to replace the
857 `old_id' with the `new_id'. */
859 void silc_server_send_notify_channel_change(SilcServer server,
860 SilcSocketConnection sock,
862 SilcChannelID *old_id,
863 SilcChannelID *new_id,
866 SilcBuffer idp1, idp2;
868 idp1 = silc_id_payload_encode((void *)old_id, SILC_ID_CHANNEL);
869 idp2 = silc_id_payload_encode((void *)new_id, SILC_ID_CHANNEL);
871 silc_server_send_notify(server, sock, broadcast,
872 SILC_NOTIFY_TYPE_CHANNEL_CHANGE,
873 2, idp1->data, idp1->len, idp2->data, idp2->len);
874 silc_buffer_free(idp1);
875 silc_buffer_free(idp2);
878 /* Send NICK_CHANGE notify type. This tells the receiver to replace the
879 `old_id' with the `new_id'. */
881 void silc_server_send_notify_nick_change(SilcServer server,
882 SilcSocketConnection sock,
884 SilcClientID *old_id,
885 SilcClientID *new_id,
888 SilcBuffer idp1, idp2;
890 idp1 = silc_id_payload_encode((void *)old_id, SILC_ID_CLIENT);
891 idp2 = silc_id_payload_encode((void *)new_id, SILC_ID_CLIENT);
893 silc_server_send_notify(server, sock, broadcast,
894 SILC_NOTIFY_TYPE_NICK_CHANGE,
895 2, idp1->data, idp1->len, idp2->data, idp2->len);
896 silc_buffer_free(idp1);
897 silc_buffer_free(idp2);
900 /* Sends JOIN notify type. This tells that new client by `client_id' ID
901 has joined to the `channel'. */
903 void silc_server_send_notify_join(SilcServer server,
904 SilcSocketConnection sock,
906 SilcChannelEntry channel,
907 SilcClientID *client_id,
908 unsigned int client_id_len)
910 SilcBuffer idp1, idp2;
912 idp1 = silc_id_payload_encode((void *)client_id, SILC_ID_CLIENT);
913 idp2 = silc_id_payload_encode((void *)channel->id, SILC_ID_CHANNEL);
914 silc_server_send_notify(server, sock, broadcast, SILC_NOTIFY_TYPE_JOIN,
915 2, idp1->data, idp1->len,
916 idp2->data, idp2->len);
917 silc_buffer_free(idp1);
918 silc_buffer_free(idp2);
921 /* Sends LEAVE notify type. This tells that `client_id' has left the
922 `channel'. The Notify packet is always destined to the channel. */
924 void silc_server_send_notify_leave(SilcServer server,
925 SilcSocketConnection sock,
927 SilcChannelEntry channel,
928 SilcClientID *client_id,
929 unsigned int client_id_len)
933 idp = silc_id_payload_encode((void *)client_id, SILC_ID_CLIENT);
934 silc_server_send_notify_dest(server, sock, broadcast, (void *)channel->id,
935 SILC_ID_CHANNEL, SILC_NOTIFY_TYPE_LEAVE,
936 1, idp->data, idp->len);
937 silc_buffer_free(idp);
940 /* Sends CMODE_CHANGE notify type. This tells that `client_id' changed the
941 `channel' mode to `mode. The Notify packet is always destined to
944 void silc_server_send_notify_cmode(SilcServer server,
945 SilcSocketConnection sock,
947 SilcChannelEntry channel,
948 unsigned int mode_mask,
949 SilcClientID *client_id,
950 unsigned int client_id_len,
951 char *cipher, char *hmac)
954 unsigned char mode[4];
956 idp = silc_id_payload_encode((void *)client_id, SILC_ID_CLIENT);
957 SILC_PUT32_MSB(mode_mask, mode);
959 silc_server_send_notify_dest(server, sock, broadcast, (void *)channel->id,
960 SILC_ID_CHANNEL, SILC_NOTIFY_TYPE_CMODE_CHANGE,
961 4, idp->data, idp->len,
963 cipher, cipher ? strlen(cipher) : 0,
964 hmac, hmac ? strlen(hmac) : 0);
965 silc_buffer_free(idp);
968 /* Sends CUMODE_CHANGE notify type. This tells that `client_id' changed the
969 `target' client's mode on `channel'. The Notify packet is always
970 destined to the channel. */
972 void silc_server_send_notify_cumode(SilcServer server,
973 SilcSocketConnection sock,
975 SilcChannelEntry channel,
976 unsigned int mode_mask,
977 SilcClientID *client_id,
978 unsigned int client_id_len,
979 SilcClientID *target,
980 unsigned int target_len)
982 SilcBuffer idp1, idp2;
983 unsigned char mode[4];
985 idp1 = silc_id_payload_encode((void *)client_id, SILC_ID_CLIENT);
986 idp2 = silc_id_payload_encode((void *)target, SILC_ID_CLIENT);
987 SILC_PUT32_MSB(mode_mask, mode);
989 silc_server_send_notify_dest(server, sock, broadcast, (void *)channel->id,
991 SILC_NOTIFY_TYPE_CUMODE_CHANGE, 3,
992 idp1->data, idp1->len,
994 idp2->data, idp2->len);
995 silc_buffer_free(idp1);
996 silc_buffer_free(idp2);
999 /* Sends SIGNOFF notify type. This tells that `client_id' client has
1000 left SILC network. This function is used only between server and router
1001 traffic. This is not used to send the notify to the channel for
1002 client. The `message may be NULL. */
1004 void silc_server_send_notify_signoff(SilcServer server,
1005 SilcSocketConnection sock,
1007 SilcClientID *client_id,
1008 unsigned int client_id_len,
1013 idp = silc_id_payload_encode((void *)client_id, SILC_ID_CLIENT);
1014 silc_server_send_notify(server, sock, broadcast,
1015 SILC_NOTIFY_TYPE_SIGNOFF,
1016 message ? 2 : 1, idp->data, idp->len,
1017 message, message ? strlen(message): 0);
1018 silc_buffer_free(idp);
1021 /* Sends SERVER_SIGNOFF notify type. This tells that `server_id' server
1022 has quit SILC network. */
1024 void silc_server_send_notify_server_signoff(SilcServer server,
1025 SilcSocketConnection sock,
1027 SilcServerID *server_id,
1028 unsigned int server_id_len)
1032 idp = silc_id_payload_encode((void *)server_id, SILC_ID_SERVER);
1033 silc_server_send_notify(server, sock, broadcast,
1034 SILC_NOTIFY_TYPE_SERVER_SIGNOFF,
1035 1, idp->data, idp->len);
1036 silc_buffer_free(idp);
1039 /* Sends TOPIC_SET notify type. This tells that `client_id' changed
1040 the `channel's topic to `topic'. The Notify packet is always destined
1041 to the channel. This function is used to send the topic set notifies
1044 void silc_server_send_notify_topic_set(SilcServer server,
1045 SilcSocketConnection sock,
1047 SilcChannelEntry channel,
1048 SilcClientID *client_id,
1049 unsigned int client_id_len,
1054 idp = silc_id_payload_encode((void *)client_id, SILC_ID_CLIENT);
1055 silc_server_send_notify(server, sock, broadcast,
1056 SILC_NOTIFY_TYPE_SERVER_SIGNOFF,
1058 idp->data, idp->len,
1059 topic, topic ? strlen(topic) : 0);
1060 silc_buffer_free(idp);
1063 /* Send KICKED notify type. This tells that the `client_id' on `channel'
1064 was kicked off the channel. The `comment' may indicate the reason
1065 for the kicking. This function is used only between server and router
1068 void silc_server_send_notify_kicked(SilcServer server,
1069 SilcSocketConnection sock,
1071 SilcChannelEntry channel,
1072 SilcClientID *client_id,
1073 unsigned int client_id_len,
1078 idp = silc_id_payload_encode((void *)client_id, SILC_ID_CLIENT);
1079 silc_server_send_notify_dest(server, sock, broadcast, (void *)channel->id,
1080 SILC_ID_CHANNEL, SILC_NOTIFY_TYPE_KICKED,
1081 comment ? 2 : 1, idp->data, idp->len,
1082 comment, comment ? strlen(comment) : 0);
1083 silc_buffer_free(idp);
1086 /* Send KILLED notify type. This tells that the `client_id' client was
1087 killed from the network. The `comment' may indicate the reason
1090 void silc_server_send_notify_killed(SilcServer server,
1091 SilcSocketConnection sock,
1093 SilcClientID *client_id,
1094 unsigned int client_id_len,
1099 idp = silc_id_payload_encode((void *)client_id, SILC_ID_CLIENT);
1100 silc_server_send_notify_dest(server, sock, broadcast, (void *)client_id,
1101 SILC_ID_CLIENT, SILC_NOTIFY_TYPE_KILLED,
1102 comment ? 2 : 1, idp->data, idp->len,
1103 comment, comment ? strlen(comment) : 0);
1104 silc_buffer_free(idp);
1107 /* Sends UMODE_CHANGE notify type. This tells that `client_id' client's
1108 user mode in the SILC Network was changed. This function is used to
1109 send the packet between routers as broadcast packet. */
1111 void silc_server_send_notify_umode(SilcServer server,
1112 SilcSocketConnection sock,
1114 SilcClientID *client_id,
1115 unsigned int client_id_len,
1116 unsigned int mode_mask)
1119 unsigned char mode[4];
1121 idp = silc_id_payload_encode((void *)client_id, SILC_ID_CLIENT);
1122 SILC_PUT32_MSB(mode_mask, mode);
1124 silc_server_send_notify(server, sock, broadcast,
1125 SILC_NOTIFY_TYPE_UMODE_CHANGE, 2,
1126 idp->data, idp->len,
1128 silc_buffer_free(idp);
1131 /* Sends BAN notify type. This tells that ban has been either `add'ed
1132 or `del'eted on the `channel. This function is used to send the packet
1133 between routers as broadcast packet. */
1135 void silc_server_send_notify_ban(SilcServer server,
1136 SilcSocketConnection sock,
1138 SilcChannelEntry channel,
1139 char *add, char *del)
1143 idp = silc_id_payload_encode((void *)channel->id, SILC_ID_CHANNEL);
1144 silc_server_send_notify(server, sock, broadcast,
1145 SILC_NOTIFY_TYPE_BAN, 3,
1146 idp->data, idp->len,
1147 add, add ? strlen(add) : 0,
1148 del, del ? strlen(del) : 0);
1149 silc_buffer_free(idp);
1152 /* Sends INVITE notify type. This tells that invite has been either `add'ed
1153 or `del'eted on the `channel. The sender of the invite is the `client_id'.
1154 This function is used to send the packet between routers as broadcast
1157 void silc_server_send_notify_invite(SilcServer server,
1158 SilcSocketConnection sock,
1160 SilcChannelEntry channel,
1161 SilcClientID *client_id,
1162 unsigned int client_id_len,
1163 char *add, char *del)
1165 SilcBuffer idp, idp2;
1167 idp = silc_id_payload_encode((void *)channel->id, SILC_ID_CHANNEL);
1168 idp2 = silc_id_payload_encode((void *)client_id, SILC_ID_CLIENT);
1169 silc_server_send_notify(server, sock, broadcast,
1170 SILC_NOTIFY_TYPE_INVITE, 5,
1171 idp->data, idp->len,
1172 channel->channel_name, strlen(channel->channel_name),
1173 idp2->data, idp2->len,
1174 add, add ? strlen(add) : 0,
1175 del, del ? strlen(del) : 0);
1176 silc_buffer_free(idp);
1177 silc_buffer_free(idp2);
1180 /* Sends notify message destined to specific entity. */
1182 void silc_server_send_notify_dest(SilcServer server,
1183 SilcSocketConnection sock,
1186 SilcIdType dest_id_type,
1187 SilcNotifyType type,
1188 unsigned int argc, ...)
1195 packet = silc_notify_payload_encode(type, argc, ap);
1196 silc_server_packet_send_dest(server, sock, SILC_PACKET_NOTIFY, 0,
1197 dest_id, dest_id_type,
1198 packet->data, packet->len, FALSE);
1199 silc_buffer_free(packet);
1202 /* Sends notify message to a channel. The notify message sent is
1203 distributed to all clients on the channel. If `route_notify' is TRUE
1204 then the notify may be routed to primary route or to some other routers.
1205 If FALSE it is assured that the notify is sent only locally. If `sender'
1206 is provided then the packet is not sent to that connection since it
1207 originally came from it. */
1209 void silc_server_send_notify_to_channel(SilcServer server,
1210 SilcSocketConnection sender,
1211 SilcChannelEntry channel,
1212 unsigned char route_notify,
1213 SilcNotifyType type,
1214 unsigned int argc, ...)
1221 packet = silc_notify_payload_encode(type, argc, ap);
1222 silc_server_packet_send_to_channel(server, sender, channel,
1223 SILC_PACKET_NOTIFY, route_notify,
1224 packet->data, packet->len, FALSE);
1225 silc_buffer_free(packet);
1228 /* Send notify message to all channels the client has joined. It is quaranteed
1229 that the message is sent only once to a client (ie. if a client is joined
1230 on two same channel it will receive only one notify message). Also, this
1231 sends only to local clients (locally connected if we are server, and to
1232 local servers if we are router). If `sender' is provided the packet is
1233 not sent to that client at all. */
1235 void silc_server_send_notify_on_channels(SilcServer server,
1236 SilcClientEntry sender,
1237 SilcClientEntry client,
1238 SilcNotifyType type,
1239 unsigned int argc, ...)
1242 SilcSocketConnection sock = NULL;
1243 SilcPacketContext packetdata;
1245 SilcClientEntry *sent_clients = NULL;
1246 unsigned int sent_clients_count = 0;
1247 SilcServerEntry *routed = NULL;
1248 unsigned int routed_count = 0;
1249 SilcChannelEntry channel;
1250 SilcChannelClientEntry chl, chl2;
1251 SilcIDListData idata;
1253 unsigned char *data;
1254 unsigned int data_len;
1255 int force_send = FALSE;
1258 SILC_LOG_DEBUG(("Start"));
1260 if (!silc_list_count(client->channels))
1264 packet = silc_notify_payload_encode(type, argc, ap);
1265 data = packet->data;
1266 data_len = packet->len;
1268 /* Set the packet context pointers. */
1269 packetdata.flags = 0;
1270 packetdata.type = SILC_PACKET_NOTIFY;
1271 packetdata.src_id = silc_id_id2str(server->id, SILC_ID_SERVER);
1272 packetdata.src_id_len = SILC_ID_SERVER_LEN;
1273 packetdata.src_id_type = SILC_ID_SERVER;
1275 silc_list_start(client->channels);
1276 while ((chl = silc_list_get(client->channels)) != SILC_LIST_END) {
1277 channel = chl->channel;
1279 /* Send the message to all clients on the channel's client list. */
1280 silc_list_start(channel->user_list);
1281 while ((chl2 = silc_list_get(channel->user_list)) != SILC_LIST_END) {
1284 if (sender && c == sender)
1287 /* Check if we have sent the packet to this client already */
1288 for (k = 0; k < sent_clients_count; k++)
1289 if (sent_clients[k] == c)
1291 if (k < sent_clients_count)
1294 /* If we are router and if this client has router set it is not
1295 locally connected client and we will route the message to the
1296 router set in the client. */
1297 if (c && c->router && server->server_type == SILC_ROUTER) {
1298 /* Check if we have sent the packet to this route already */
1299 for (k = 0; k < routed_count; k++)
1300 if (routed[k] == c->router)
1302 if (k < routed_count)
1305 /* Get data used in packet header encryption, keys and stuff. */
1306 sock = (SilcSocketConnection)c->router->connection;
1307 idata = (SilcIDListData)c->router;
1309 packetdata.dst_id = silc_id_id2str(c->router->id, SILC_ID_SERVER);
1310 packetdata.dst_id_len = SILC_ID_SERVER_LEN;
1311 packetdata.dst_id_type = SILC_ID_SERVER;
1312 packetdata.truelen = data_len + SILC_PACKET_HEADER_LEN +
1313 packetdata.src_id_len + packetdata.dst_id_len;
1314 packetdata.padlen = SILC_PACKET_PADLEN(packetdata.truelen);
1316 /* Send the packet */
1317 silc_server_packet_send_to_channel_real(server, sock, &packetdata,
1318 idata->send_key, idata->hmac,
1319 data, data_len, FALSE,
1322 silc_free(packetdata.dst_id);
1324 /* We want to make sure that the packet is routed to same router
1325 only once. Mark this route as sent route. */
1327 routed = silc_realloc(routed, sizeof(*routed) * (k + 1));
1328 routed[k] = c->router;
1337 /* Send to locally connected client */
1340 /* Get data used in packet header encryption, keys and stuff. */
1341 sock = (SilcSocketConnection)c->connection;
1342 idata = (SilcIDListData)c;
1344 packetdata.dst_id = silc_id_id2str(c->id, SILC_ID_CLIENT);
1345 packetdata.dst_id_len = SILC_ID_CLIENT_LEN;
1346 packetdata.dst_id_type = SILC_ID_CLIENT;
1347 packetdata.truelen = data_len + SILC_PACKET_HEADER_LEN +
1348 packetdata.src_id_len + packetdata.dst_id_len;
1349 packetdata.padlen = SILC_PACKET_PADLEN(packetdata.truelen);
1351 /* Send the packet */
1352 silc_server_packet_send_to_channel_real(server, sock, &packetdata,
1353 idata->send_key, idata->hmac,
1354 data, data_len, FALSE,
1357 silc_free(packetdata.dst_id);
1359 /* Make sure that we send the notify only once per client. */
1360 sent_clients = silc_realloc(sent_clients, sizeof(*sent_clients) *
1361 (sent_clients_count + 1));
1362 sent_clients[sent_clients_count] = c;
1363 sent_clients_count++;
1370 if (sent_clients_count)
1371 silc_free(sent_clients);
1372 silc_free(packetdata.src_id);
1375 /* Sends New ID Payload to remote end. The packet is used to distribute
1376 information about new registered clients, servers, channel etc. usually
1377 to routers so that they can keep these information up to date.
1378 If the argument `broadcast' is TRUE then the packet is sent as
1379 broadcast packet. */
1381 void silc_server_send_new_id(SilcServer server,
1382 SilcSocketConnection sock,
1384 void *id, SilcIdType id_type,
1385 unsigned int id_len)
1389 SILC_LOG_DEBUG(("Start"));
1391 idp = silc_id_payload_encode(id, id_type);
1392 silc_server_packet_send(server, sock, SILC_PACKET_NEW_ID,
1393 broadcast ? SILC_PACKET_FLAG_BROADCAST : 0,
1394 idp->data, idp->len, FALSE);
1395 silc_buffer_free(idp);
1398 /* Send New Channel Payload to notify about newly created channel in the
1399 SILC network. Normal server nevers sends this packet. Router uses this
1400 to notify other routers in the network about new channel. This packet
1403 void silc_server_send_new_channel(SilcServer server,
1404 SilcSocketConnection sock,
1408 unsigned int channel_id_len,
1413 unsigned int name_len = strlen(channel_name);
1415 SILC_LOG_DEBUG(("Start"));
1417 cid = silc_id_id2str(channel_id, SILC_ID_CHANNEL);
1421 /* Encode the channel payload */
1422 packet = silc_channel_payload_encode(channel_name, name_len,
1423 cid, channel_id_len, mode);
1425 silc_server_packet_send(server, sock, SILC_PACKET_NEW_CHANNEL,
1426 broadcast ? SILC_PACKET_FLAG_BROADCAST : 0,
1427 packet->data, packet->len, FALSE);
1430 silc_buffer_free(packet);
1433 /* Send Channel Key payload to distribute the new channel key. Normal server
1434 sends this to router when new client joins to existing channel. Router
1435 sends this to the local server who sent the join command in case where
1436 the channel did not exist yet. Both normal and router servers uses this
1437 also to send this to locally connected clients on the channel. This
1438 must not be broadcasted packet. Routers do not send this to each other.
1439 If `sender is provided then the packet is not sent to that connection since
1440 it originally came from it. */
1442 void silc_server_send_channel_key(SilcServer server,
1443 SilcSocketConnection sender,
1444 SilcChannelEntry channel,
1445 unsigned char route)
1448 unsigned char *chid;
1449 unsigned int tmp_len;
1451 SILC_LOG_DEBUG(("Start"));
1453 chid = silc_id_id2str(channel->id, SILC_ID_CHANNEL);
1457 /* Encode channel key packet */
1458 tmp_len = strlen(channel->channel_key->cipher->name);
1459 packet = silc_channel_key_payload_encode(SILC_ID_CHANNEL_LEN, chid, tmp_len,
1460 channel->channel_key->cipher->name,
1461 channel->key_len / 8, channel->key);
1463 silc_server_packet_send_to_channel(server, sender, channel,
1464 SILC_PACKET_CHANNEL_KEY,
1465 route, packet->data, packet->len, FALSE);
1466 silc_buffer_free(packet);
1470 /* Generic function to send any command. The arguments must be sent already
1471 encoded into correct form in correct order. */
1473 void silc_server_send_command(SilcServer server,
1474 SilcSocketConnection sock,
1475 SilcCommand command,
1476 unsigned int argc, ...)
1483 packet = silc_command_payload_encode_vap(command, 0, argc, ap);
1484 silc_server_packet_send(server, sock, SILC_PACKET_COMMAND, 0,
1485 packet->data, packet->len, TRUE);
1486 silc_buffer_free(packet);
1489 /* Send the heartbeat packet. */
1491 void silc_server_send_heartbeat(SilcServer server,
1492 SilcSocketConnection sock)
1494 silc_server_packet_send(server, sock, SILC_PACKET_HEARTBEAT, 0,
1498 /* Generic function to relay packet we've received. This is used to relay
1499 packets to a client but generally can be used to other purposes as well. */
1501 void silc_server_relay_packet(SilcServer server,
1502 SilcSocketConnection dst_sock,
1505 SilcPacketContext *packet,
1508 silc_buffer_push(packet->buffer, SILC_PACKET_HEADER_LEN + packet->src_id_len
1509 + packet->dst_id_len + packet->padlen);
1511 silc_packet_send_prepare(dst_sock, 0, 0, packet->buffer->len);
1512 silc_buffer_put(dst_sock->outbuf, packet->buffer->data, packet->buffer->len);
1514 /* Re-encrypt packet */
1515 silc_packet_encrypt(cipher, hmac, dst_sock->outbuf, packet->buffer->len);
1517 /* Send the packet */
1518 silc_server_packet_send_real(server, dst_sock, force_send);
1520 silc_buffer_pull(packet->buffer, SILC_PACKET_HEADER_LEN + packet->src_id_len
1521 + packet->dst_id_len + packet->padlen);