5 Author: Pekka Riikonen <priikone@poseidon.pspt.fi>
7 Copyright (C) 1997 - 2000 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.
22 #include "clientlibincludes.h"
24 /* Static task callback prototypes */
25 SILC_TASK_CALLBACK(silc_client_connect_to_server_start);
26 SILC_TASK_CALLBACK(silc_client_connect_to_server_second);
27 SILC_TASK_CALLBACK(silc_client_connect_to_server_final);
28 SILC_TASK_CALLBACK(silc_client_packet_process);
29 SILC_TASK_CALLBACK(silc_client_packet_parse_real);
31 static void silc_client_packet_parse(SilcPacketParserContext *parser_context);
32 static void silc_client_packet_parse_type(SilcClient client,
33 SilcSocketConnection sock,
34 SilcPacketContext *packet);
36 /* Allocates new client object. This has to be done before client may
37 work. After calling this one must call silc_client_init to initialize
38 the client. The `application' is application specific user data pointer
39 and caller must free it. */
41 SilcClient silc_client_alloc(SilcClientOperations *ops, void *application)
43 SilcClient new_client;
45 new_client = silc_calloc(1, sizeof(*new_client));
46 new_client->application = application;
47 new_client->ops = ops;
52 /* Free's client object */
54 void silc_client_free(SilcClient client)
61 /* Initializes the client. This makes all the necessary steps to make
62 the client ready to be run. One must call silc_client_run to run the
65 int silc_client_init(SilcClient client)
67 SILC_LOG_DEBUG(("Initializing client"));
69 /* Initialize hash functions for client to use */
70 silc_hash_alloc("md5", &client->md5hash);
71 silc_hash_alloc("sha1", &client->sha1hash);
73 /* Initialize none cipher */
74 silc_cipher_alloc("none", &client->none_cipher);
76 /* Initialize random number generator */
77 client->rng = silc_rng_alloc();
78 silc_rng_init(client->rng);
79 silc_math_primegen_init(); /* XXX */
81 /* Register protocols */
82 silc_client_protocols_register();
84 /* Initialize the scheduler */
85 silc_schedule_init(&client->io_queue, &client->timeout_queue,
86 &client->generic_queue, 5000);
91 /* Stops the client. This is called to stop the client and thus to stop
94 void silc_client_stop(SilcClient client)
96 SILC_LOG_DEBUG(("Stopping client"));
98 /* Stop the scheduler, although it might be already stopped. This
99 doesn't hurt anyone. This removes all the tasks and task queues,
101 silc_schedule_stop();
102 silc_schedule_uninit();
104 silc_client_protocols_unregister();
106 SILC_LOG_DEBUG(("Client stopped"));
109 /* Runs the client. */
111 void silc_client_run(SilcClient client)
113 SILC_LOG_DEBUG(("Running client"));
115 /* Start the scheduler, the heart of the SILC client. When this returns
116 the program will be terminated. */
120 /* Allocates and adds new connection to the client. This adds the allocated
121 connection to the connection table and returns a pointer to it. A client
122 can have multiple connections to multiple servers. Every connection must
123 be added to the client using this function. User data `context' may
124 be sent as argument. */
126 SilcClientConnection silc_client_add_connection(SilcClient client,
131 SilcClientConnection conn;
134 conn = silc_calloc(1, sizeof(*conn));
136 /* Initialize ID caches */
137 conn->client_cache = silc_idcache_alloc(0);
138 conn->channel_cache = silc_idcache_alloc(0);
139 conn->server_cache = silc_idcache_alloc(0);
140 conn->client = client;
141 conn->remote_host = strdup(hostname);
142 conn->remote_port = port;
143 conn->context = context;
145 /* Add the connection to connections table */
146 for (i = 0; i < client->conns_count; i++)
147 if (client->conns && !client->conns[i]) {
148 client->conns[i] = conn;
152 client->conns = silc_realloc(client->conns, sizeof(*client->conns)
153 * (client->conns_count + 1));
154 client->conns[client->conns_count] = conn;
155 client->conns_count++;
160 /* Removes connection from client. */
162 void silc_client_del_connection(SilcClient client, SilcClientConnection conn)
166 for (i = 0; i < client->conns_count; i++)
167 if (client->conns[i] == conn) {
169 client->conns[i] = NULL;
173 /* Internal context for connection process. This is needed as we
174 doing asynchronous connecting. */
177 SilcClientConnection conn;
183 } SilcClientInternalConnectContext;
186 silc_client_connect_to_server_internal(SilcClientInternalConnectContext *ctx)
190 /* XXX In the future we should give up this non-blocking connect all
191 together and use threads instead. */
192 /* Create connection to server asynchronously */
193 sock = silc_net_create_connection_async(ctx->port, ctx->host);
197 /* Register task that will receive the async connect and will
199 ctx->task = silc_task_register(ctx->client->io_queue, sock,
200 silc_client_connect_to_server_start,
203 SILC_TASK_PRI_NORMAL);
204 silc_task_reset_iotype(ctx->task, SILC_TASK_WRITE);
205 silc_schedule_set_listen_fd(sock, ctx->task->iomask);
212 /* Connects to remote server. This is the main routine used to connect
213 to SILC server. Returns -1 on error and the created socket otherwise.
214 The `context' is user context that is saved into the SilcClientConnection
215 that is created after the connection is created. */
217 int silc_client_connect_to_server(SilcClient client, int port,
218 char *host, void *context)
220 SilcClientInternalConnectContext *ctx;
221 SilcClientConnection conn;
224 SILC_LOG_DEBUG(("Connecting to port %d of server %s",
227 conn = silc_client_add_connection(client, host, port, context);
229 client->ops->say(client, conn,
230 "Connecting to port %d of server %s", port, host);
232 /* Allocate internal context for connection process. This is
233 needed as we are doing async connecting. */
234 ctx = silc_calloc(1, sizeof(*ctx));
235 ctx->client = client;
237 ctx->host = strdup(host);
241 /* Do the actual connecting process */
242 sock = silc_client_connect_to_server_internal(ctx);
244 silc_client_del_connection(client, conn);
248 /* Start SILC Key Exchange (SKE) protocol to negotiate shared secret
249 key material between client and server. This function can be called
250 directly if application is performing its own connecting and does not
251 use the connecting provided by this library. */
253 int silc_client_start_key_exchange(SilcClient client,
254 SilcClientConnection conn,
257 SilcProtocol protocol;
258 SilcClientKEInternalContext *proto_ctx;
261 /* Allocate new socket connection object */
262 silc_socket_alloc(fd, SILC_SOCKET_TYPE_SERVER, (void *)conn, &conn->sock);
263 if (conn->sock == NULL) {
264 client->ops->say(client, conn,
265 "Error: Could not allocate connection socket");
269 conn->nickname = strdup(client->username);
270 conn->sock->hostname = conn->remote_host;
271 conn->sock->port = conn->remote_port;
273 /* Allocate internal Key Exchange context. This is sent to the
274 protocol as context. */
275 proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
276 proto_ctx->client = (void *)client;
277 proto_ctx->sock = conn->sock;
278 proto_ctx->rng = client->rng;
279 proto_ctx->responder = FALSE;
281 /* Perform key exchange protocol. silc_client_connect_to_server_final
282 will be called after the protocol is finished. */
283 silc_protocol_alloc(SILC_PROTOCOL_CLIENT_KEY_EXCHANGE,
284 &protocol, (void *)proto_ctx,
285 silc_client_connect_to_server_second);
287 client->ops->say(client, conn,
288 "Error: Could not start authentication protocol");
291 conn->sock->protocol = protocol;
293 /* Register the connection for network input and output. This sets
294 that scheduler will listen for incoming packets for this connection
295 and sets that outgoing packets may be sent to this connection as well.
296 However, this doesn't set the scheduler for outgoing traffic, it will
297 be set separately by calling SILC_CLIENT_SET_CONNECTION_FOR_OUTPUT,
298 later when outgoing data is available. */
299 context = (void *)client;
300 SILC_CLIENT_REGISTER_CONNECTION_FOR_IO(fd);
302 /* Execute the protocol */
303 protocol->execute(client->timeout_queue, 0, protocol, fd, 0, 0);
307 /* Start of the connection to the remote server. This is called after
308 succesful TCP/IP connection has been established to the remote host. */
310 SILC_TASK_CALLBACK(silc_client_connect_to_server_start)
312 SilcClientInternalConnectContext *ctx =
313 (SilcClientInternalConnectContext *)context;
314 SilcClient client = ctx->client;
315 SilcClientConnection conn = ctx->conn;
316 int opt, opt_len = sizeof(opt);
318 SILC_LOG_DEBUG(("Start"));
320 /* Check the socket status as it might be in error */
321 getsockopt(fd, SOL_SOCKET, SO_ERROR, &opt, &opt_len);
323 if (ctx->tries < 2) {
324 /* Connection failed but lets try again */
325 client->ops->say(client, conn, "Could not connect to server %s: %s",
326 ctx->host, strerror(opt));
327 client->ops->say(client, conn,
328 "Connecting to port %d of server %s resumed",
329 ctx->port, ctx->host);
331 /* Unregister old connection try */
332 silc_schedule_unset_listen_fd(fd);
333 silc_net_close_connection(fd);
334 silc_task_unregister(client->io_queue, ctx->task);
337 silc_client_connect_to_server_internal(ctx);
340 /* Connection failed and we won't try anymore */
341 client->ops->say(client, conn, "Could not connect to server %s: %s",
342 ctx->host, strerror(opt));
343 silc_schedule_unset_listen_fd(fd);
344 silc_net_close_connection(fd);
345 silc_task_unregister(client->io_queue, ctx->task);
348 /* Notify application of failure */
349 client->ops->connect(client, conn, FALSE);
350 silc_client_del_connection(client, conn);
355 silc_schedule_unset_listen_fd(fd);
356 silc_task_unregister(client->io_queue, ctx->task);
359 if (!silc_client_start_key_exchange(client, conn, fd)) {
360 silc_net_close_connection(fd);
361 client->ops->connect(client, conn, FALSE);
365 /* Second part of the connecting to the server. This executed
366 authentication protocol. */
368 SILC_TASK_CALLBACK(silc_client_connect_to_server_second)
370 SilcProtocol protocol = (SilcProtocol)context;
371 SilcClientKEInternalContext *ctx =
372 (SilcClientKEInternalContext *)protocol->context;
373 SilcClient client = (SilcClient)ctx->client;
374 SilcSocketConnection sock = NULL;
375 SilcClientConnAuthInternalContext *proto_ctx;
377 SILC_LOG_DEBUG(("Start"));
379 if (protocol->state == SILC_PROTOCOL_STATE_ERROR) {
380 /* Error occured during protocol */
381 SILC_LOG_DEBUG(("Error during KE protocol"));
382 silc_protocol_free(protocol);
384 silc_ske_free(ctx->ske);
386 silc_free(ctx->dest_id);
387 ctx->sock->protocol = NULL;
389 /* Notify application of failure */
390 client->ops->connect(client, ctx->sock->user_data, FALSE);
395 /* Allocate internal context for the authentication protocol. This
396 is sent as context for the protocol. */
397 proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
398 proto_ctx->client = (void *)client;
399 proto_ctx->sock = sock = ctx->sock;
400 proto_ctx->ske = ctx->ske; /* Save SKE object from previous protocol */
401 proto_ctx->dest_id_type = ctx->dest_id_type;
402 proto_ctx->dest_id = ctx->dest_id;
404 /* Resolve the authentication method to be used in this connection */
405 if (!client->ops->get_auth_method(client, sock->user_data, sock->hostname,
406 sock->port, &proto_ctx->auth_meth,
407 &proto_ctx->auth_data,
408 &proto_ctx->auth_data_len))
410 /* XXX do AUTH_REQUEST resolcing with server */
411 proto_ctx->auth_meth = SILC_PROTOCOL_CONN_AUTH_NONE;
414 /* Free old protocol as it is finished now */
415 silc_protocol_free(protocol);
417 silc_buffer_free(ctx->packet);
419 /* silc_free(ctx->keymat....); */
420 sock->protocol = NULL;
422 /* Allocate the authentication protocol. This is allocated here
423 but we won't start it yet. We will be receiving party of this
424 protocol thus we will wait that connecting party will make
426 silc_protocol_alloc(SILC_PROTOCOL_CLIENT_CONNECTION_AUTH,
427 &sock->protocol, (void *)proto_ctx,
428 silc_client_connect_to_server_final);
430 /* Execute the protocol */
431 sock->protocol->execute(client->timeout_queue, 0, sock->protocol, fd, 0, 0);
434 /* Finalizes the connection to the remote SILC server. This is called
435 after authentication protocol has been completed. This send our
436 user information to the server to receive our client ID from
439 SILC_TASK_CALLBACK(silc_client_connect_to_server_final)
441 SilcProtocol protocol = (SilcProtocol)context;
442 SilcClientConnAuthInternalContext *ctx =
443 (SilcClientConnAuthInternalContext *)protocol->context;
444 SilcClient client = (SilcClient)ctx->client;
445 SilcClientConnection conn = (SilcClientConnection)ctx->sock->user_data;
448 SILC_LOG_DEBUG(("Start"));
450 if (protocol->state == SILC_PROTOCOL_STATE_ERROR) {
451 /* Error occured during protocol */
452 SILC_LOG_DEBUG(("Error during authentication protocol"));
453 silc_protocol_free(protocol);
455 silc_free(ctx->auth_data);
457 silc_ske_free(ctx->ske);
459 silc_free(ctx->dest_id);
460 conn->sock->protocol = NULL;
462 /* Notify application of failure */
463 client->ops->connect(client, ctx->sock->user_data, FALSE);
468 /* Send NEW_CLIENT packet to the server. We will become registered
469 to the SILC network after sending this packet and we will receive
470 client ID from the server. */
471 packet = silc_buffer_alloc(2 + 2 + strlen(client->username) +
472 strlen(client->realname));
473 silc_buffer_pull_tail(packet, SILC_BUFFER_END(packet));
474 silc_buffer_format(packet,
475 SILC_STR_UI_SHORT(strlen(client->username)),
476 SILC_STR_UI_XNSTRING(client->username,
477 strlen(client->username)),
478 SILC_STR_UI_SHORT(strlen(client->realname)),
479 SILC_STR_UI_XNSTRING(client->realname,
480 strlen(client->realname)),
483 /* Send the packet */
484 silc_client_packet_send(client, ctx->sock, SILC_PACKET_NEW_CLIENT,
486 packet->data, packet->len, TRUE);
487 silc_buffer_free(packet);
489 /* Save remote ID. */
490 conn->remote_id = ctx->dest_id;
491 conn->remote_id_data = silc_id_id2str(ctx->dest_id, SILC_ID_SERVER);
492 conn->remote_id_data_len = SILC_ID_SERVER_LEN;
494 /* Notify application of successful connection */
495 client->ops->connect(client, conn, TRUE);
497 silc_protocol_free(protocol);
499 silc_free(ctx->auth_data);
501 silc_ske_free(ctx->ske);
503 silc_free(ctx->dest_id);
505 conn->sock->protocol = NULL;
508 /* Internal routine that sends packet or marks packet to be sent. This
509 is used directly only in special cases. Normal cases should use
510 silc_server_packet_send. Returns < 0 on error. */
512 static int silc_client_packet_send_real(SilcClient client,
513 SilcSocketConnection sock,
518 /* Send the packet */
519 ret = silc_packet_send(sock, force_send);
523 /* Mark that there is some outgoing data available for this connection.
524 This call sets the connection both for input and output (the input
525 is set always and this call keeps the input setting, actually).
526 Actual data sending is performed by silc_client_packet_process. */
527 SILC_CLIENT_SET_CONNECTION_FOR_OUTPUT(sock->sock);
529 /* Mark to socket that data is pending in outgoing buffer. This flag
530 is needed if new data is added to the buffer before the earlier
531 put data is sent to the network. */
532 SILC_SET_OUTBUF_PENDING(sock);
537 /* Packet processing callback. This is used to send and receive packets
538 from network. This is generic task. */
540 SILC_TASK_CALLBACK(silc_client_packet_process)
542 SilcClient client = (SilcClient)context;
543 SilcSocketConnection sock = NULL;
544 SilcClientConnection conn;
547 SILC_LOG_DEBUG(("Processing packet"));
549 SILC_CLIENT_GET_SOCK(client, fd, sock);
553 conn = (SilcClientConnection)sock->user_data;
556 if (type == SILC_TASK_WRITE) {
557 SILC_LOG_DEBUG(("Writing data to connection"));
559 if (sock->outbuf->data - sock->outbuf->head)
560 silc_buffer_push(sock->outbuf,
561 sock->outbuf->data - sock->outbuf->head);
563 ret = silc_client_packet_send_real(client, sock, TRUE);
565 /* If returned -2 could not write to connection now, will do
570 /* The packet has been sent and now it is time to set the connection
571 back to only for input. When there is again some outgoing data
572 available for this connection it will be set for output as well.
573 This call clears the output setting and sets it only for input. */
574 SILC_CLIENT_SET_CONNECTION_FOR_INPUT(fd);
575 SILC_UNSET_OUTBUF_PENDING(sock);
577 silc_buffer_clear(sock->outbuf);
581 /* Packet receiving */
582 if (type == SILC_TASK_READ) {
583 SILC_LOG_DEBUG(("Reading data from connection"));
585 /* Read data from network */
586 ret = silc_packet_receive(sock);
592 SILC_LOG_DEBUG(("Read EOF"));
594 /* If connection is disconnecting already we will finally
595 close the connection */
596 if (SILC_IS_DISCONNECTING(sock)) {
597 client->ops->disconnect(client, conn);
598 silc_client_close_connection(client, sock);
602 client->ops->say(client, conn, "Connection closed: premature EOF");
603 SILC_LOG_DEBUG(("Premature EOF from connection %d", sock->sock));
604 client->ops->disconnect(client, conn);
605 silc_client_close_connection(client, sock);
609 /* Process the packet. This will call the parser that will then
610 decrypt and parse the packet. */
611 silc_packet_receive_process(sock, conn->receive_key, conn->hmac,
612 silc_client_packet_parse, client);
616 /* Parses whole packet, received earlier. */
618 SILC_TASK_CALLBACK(silc_client_packet_parse_real)
620 SilcPacketParserContext *parse_ctx = (SilcPacketParserContext *)context;
621 SilcClient client = (SilcClient)parse_ctx->context;
622 SilcPacketContext *packet = parse_ctx->packet;
623 SilcBuffer buffer = packet->buffer;
624 SilcSocketConnection sock = parse_ctx->sock;
625 SilcClientConnection conn = (SilcClientConnection)sock->user_data;
628 SILC_LOG_DEBUG(("Start"));
630 /* Decrypt the received packet */
631 ret = silc_packet_decrypt(conn->receive_key, conn->hmac, buffer, packet);
636 /* Parse the packet. Packet type is returned. */
637 ret = silc_packet_parse(packet);
639 /* Parse the packet header in special way as this is "special"
641 ret = silc_packet_parse_special(packet);
644 if (ret == SILC_PACKET_NONE)
647 /* Parse the incoming packet type */
648 silc_client_packet_parse_type(client, sock, packet);
651 silc_buffer_clear(buffer);
653 silc_free(packet->src_id);
655 silc_free(packet->dst_id);
657 silc_free(parse_ctx);
660 /* Parser callback called by silc_packet_receive_process. Thie merely
661 registers timeout that will handle the actual parsing when appropriate. */
663 void silc_client_packet_parse(SilcPacketParserContext *parser_context)
665 SilcClient client = (SilcClient)parser_context->context;
667 /* Parse the packet */
668 silc_task_register(client->timeout_queue, parser_context->sock->sock,
669 silc_client_packet_parse_real,
670 (void *)parser_context, 0, 1,
672 SILC_TASK_PRI_NORMAL);
675 /* Parses the packet type and calls what ever routines the packet type
676 requires. This is done for all incoming packets. */
678 void silc_client_packet_parse_type(SilcClient client,
679 SilcSocketConnection sock,
680 SilcPacketContext *packet)
682 SilcBuffer buffer = packet->buffer;
683 SilcPacketType type = packet->type;
685 SILC_LOG_DEBUG(("Parsing packet type %d", type));
687 /* Parse the packet type */
689 case SILC_PACKET_DISCONNECT:
690 silc_client_disconnected_by_server(client, sock, buffer);
692 case SILC_PACKET_SUCCESS:
694 * Success received for something. For now we can have only
695 * one protocol for connection executing at once hence this
696 * success message is for whatever protocol is executing currently.
698 if (sock->protocol) {
699 sock->protocol->execute(client->timeout_queue, 0,
700 sock->protocol, sock->sock, 0, 0);
703 case SILC_PACKET_FAILURE:
705 * Failure received for some protocol. Set the protocol state to
706 * error and call the protocol callback. This fill cause error on
707 * protocol and it will call the final callback.
709 if (sock->protocol) {
710 sock->protocol->state = SILC_PROTOCOL_STATE_FAILURE;
711 sock->protocol->execute(client->timeout_queue, 0,
712 sock->protocol, sock->sock, 0, 0);
714 /* XXX We have only two protocols currently thus we know what this
715 failure indication is. */
716 if (buffer->len >= 4) {
717 unsigned int failure;
719 SILC_GET32_MSB(failure, buffer->data);
721 /* Notify application */
722 client->ops->failure(client, sock->user_data, sock->protocol,
727 case SILC_PACKET_REJECT:
730 case SILC_PACKET_NOTIFY:
732 * Received notify message
734 silc_client_notify_by_server(client, sock, packet);
737 case SILC_PACKET_ERROR:
739 * Received error message
741 silc_client_error_by_server(client, sock, buffer);
744 case SILC_PACKET_CHANNEL_MESSAGE:
746 * Received message to (from, actually) a channel
748 silc_client_channel_message(client, sock, packet);
750 case SILC_PACKET_CHANNEL_KEY:
752 * Received key for a channel. By receiving this key the client will be
753 * able to talk to the channel it has just joined. This can also be
754 * a new key for existing channel as keys expire peridiocally.
756 silc_client_receive_channel_key(client, sock, buffer);
759 case SILC_PACKET_PRIVATE_MESSAGE:
761 * Received private message
763 silc_client_private_message(client, sock, packet);
765 case SILC_PACKET_PRIVATE_MESSAGE_KEY:
767 * Received private message key
771 case SILC_PACKET_COMMAND_REPLY:
773 * Recived reply for a command
775 silc_client_command_reply_process(client, sock, packet);
778 case SILC_PACKET_KEY_EXCHANGE:
779 if (sock->protocol) {
780 SilcClientKEInternalContext *proto_ctx =
781 (SilcClientKEInternalContext *)sock->protocol->context;
783 proto_ctx->packet = buffer;
784 proto_ctx->dest_id_type = packet->src_id_type;
785 proto_ctx->dest_id = silc_id_str2id(packet->src_id, packet->src_id_type);
787 /* Let the protocol handle the packet */
788 sock->protocol->execute(client->timeout_queue, 0,
789 sock->protocol, sock->sock, 0, 0);
791 SILC_LOG_ERROR(("Received Key Exchange packet but no key exchange "
792 "protocol active, packet dropped."));
794 /* XXX Trigger KE protocol?? Rekey actually! */
798 case SILC_PACKET_KEY_EXCHANGE_1:
799 if (sock->protocol) {
802 SILC_LOG_ERROR(("Received Key Exchange 1 packet but no key exchange "
803 "protocol active, packet dropped."));
806 case SILC_PACKET_KEY_EXCHANGE_2:
807 if (sock->protocol) {
808 SilcClientKEInternalContext *proto_ctx =
809 (SilcClientKEInternalContext *)sock->protocol->context;
811 if (proto_ctx->packet)
812 silc_buffer_free(proto_ctx->packet);
814 proto_ctx->packet = buffer;
815 proto_ctx->dest_id_type = packet->src_id_type;
816 proto_ctx->dest_id = silc_id_str2id(packet->src_id, packet->src_id_type);
818 /* Let the protocol handle the packet */
819 sock->protocol->execute(client->timeout_queue, 0,
820 sock->protocol, sock->sock, 0, 0);
822 SILC_LOG_ERROR(("Received Key Exchange 2 packet but no key exchange "
823 "protocol active, packet dropped."));
827 case SILC_PACKET_NEW_ID:
830 * Received new ID from server. This packet is received at
831 * the connection to the server. New ID is also received when
832 * user changes nickname but in that case the new ID is received
833 * as command reply and not as this packet type.
837 idp = silc_id_payload_parse(buffer);
838 if (silc_id_payload_get_type(idp) != SILC_ID_CLIENT)
841 silc_client_receive_new_id(client, sock, idp);
842 silc_id_payload_free(idp);
847 SILC_LOG_DEBUG(("Incorrect packet type %d, packet dropped", type));
852 /* Sends packet. This doesn't actually send the packet instead it assembles
853 it and marks it to be sent. However, if force_send is TRUE the packet
854 is sent immediately. if dst_id, cipher and hmac are NULL those parameters
855 will be derived from sock argument. Otherwise the valid arguments sent
858 void silc_client_packet_send(SilcClient client,
859 SilcSocketConnection sock,
862 SilcIdType dst_id_type,
866 unsigned int data_len,
869 SilcPacketContext packetdata;
871 SILC_LOG_DEBUG(("Sending packet, type %d", type));
873 /* Get data used in the packet sending, keys and stuff */
874 if ((!cipher || !hmac || !dst_id) && sock->user_data) {
875 if (!cipher && ((SilcClientConnection)sock->user_data)->send_key)
876 cipher = ((SilcClientConnection)sock->user_data)->send_key;
878 if (!hmac && ((SilcClientConnection)sock->user_data)->hmac)
879 hmac = ((SilcClientConnection)sock->user_data)->hmac;
881 if (!dst_id && ((SilcClientConnection)sock->user_data)->remote_id) {
882 dst_id = ((SilcClientConnection)sock->user_data)->remote_id;
883 dst_id_type = SILC_ID_SERVER;
887 /* Set the packet context pointers */
888 packetdata.flags = 0;
889 packetdata.type = type;
890 if (((SilcClientConnection)sock->user_data)->local_id_data)
891 packetdata.src_id = ((SilcClientConnection)sock->user_data)->local_id_data;
893 packetdata.src_id = silc_calloc(SILC_ID_CLIENT_LEN, sizeof(unsigned char));
894 packetdata.src_id_len = SILC_ID_CLIENT_LEN;
895 packetdata.src_id_type = SILC_ID_CLIENT;
897 packetdata.dst_id = silc_id_id2str(dst_id, dst_id_type);
898 packetdata.dst_id_len = silc_id_get_len(dst_id_type);
899 packetdata.dst_id_type = dst_id_type;
901 packetdata.dst_id = NULL;
902 packetdata.dst_id_len = 0;
903 packetdata.dst_id_type = SILC_ID_NONE;
905 packetdata.rng = client->rng;
906 packetdata.truelen = data_len + SILC_PACKET_HEADER_LEN +
907 packetdata.src_id_len + packetdata.dst_id_len;
908 packetdata.padlen = SILC_PACKET_PADLEN(packetdata.truelen);
910 /* Prepare outgoing data buffer for packet sending */
911 silc_packet_send_prepare(sock,
912 SILC_PACKET_HEADER_LEN +
913 packetdata.src_id_len +
914 packetdata.dst_id_len,
918 SILC_LOG_DEBUG(("Putting data to outgoing buffer, len %d", data_len));
920 packetdata.buffer = sock->outbuf;
922 /* Put the data to the buffer */
923 if (data && data_len)
924 silc_buffer_put(sock->outbuf, data, data_len);
926 /* Create the outgoing packet */
927 silc_packet_assemble(&packetdata);
929 /* Encrypt the packet */
931 silc_packet_encrypt(cipher, hmac, sock->outbuf, sock->outbuf->len);
933 SILC_LOG_HEXDUMP(("Packet, len %d", sock->outbuf->len),
934 sock->outbuf->data, sock->outbuf->len);
936 /* Now actually send the packet */
937 silc_client_packet_send_real(client, sock, force_send);
940 /* Sends packet to a channel. Packet to channel is always encrypted
941 differently from "normal" packets. SILC header of the packet is
942 encrypted with the next receiver's key and the rest of the packet is
943 encrypted with the channel specific key. Padding and HMAC is computed
944 with the next receiver's key. */
946 void silc_client_packet_send_to_channel(SilcClient client,
947 SilcSocketConnection sock,
948 SilcChannelEntry channel,
950 unsigned int data_len,
954 SilcClientConnection conn = (SilcClientConnection)sock->user_data;
956 SilcPacketContext packetdata;
959 unsigned char *id_string;
961 SILC_LOG_DEBUG(("Sending packet to channel"));
963 if (!channel || !channel->key) {
964 client->ops->say(client, conn,
965 "Cannot talk to channel: key does not exist");
971 for (i = 0; i < 16; i++) channel->iv[i] = silc_rng_get_byte(client->rng);
973 silc_hash_make(client->md5hash, channel->iv, 16, channel->iv);
975 /* Encode the channel payload */
976 payload = silc_channel_payload_encode(data_len, data, 16, channel->iv,
979 client->ops->say(client, conn,
980 "Error: Could not create packet to be sent to channel");
984 /* Get data used in packet header encryption, keys and stuff. Rest
985 of the packet (the payload) is, however, encrypted with the
986 specified channel key. */
987 cipher = conn->send_key;
989 id_string = silc_id_id2str(channel->id, SILC_ID_CHANNEL);
991 /* Set the packet context pointers. The destination ID is always
992 the Channel ID of the channel. Server and router will handle the
993 distribution of the packet. */
994 packetdata.flags = 0;
995 packetdata.type = SILC_PACKET_CHANNEL_MESSAGE;
996 packetdata.src_id = conn->local_id_data;
997 packetdata.src_id_len = SILC_ID_CLIENT_LEN;
998 packetdata.src_id_type = SILC_ID_CLIENT;
999 packetdata.dst_id = id_string;
1000 packetdata.dst_id_len = SILC_ID_CHANNEL_LEN;
1001 packetdata.dst_id_type = SILC_ID_CHANNEL;
1002 packetdata.rng = client->rng;
1003 packetdata.truelen = payload->len + SILC_PACKET_HEADER_LEN +
1004 packetdata.src_id_len + packetdata.dst_id_len;
1005 packetdata.padlen = SILC_PACKET_PADLEN((SILC_PACKET_HEADER_LEN +
1006 packetdata.src_id_len +
1007 packetdata.dst_id_len));
1009 /* Prepare outgoing data buffer for packet sending */
1010 silc_packet_send_prepare(sock,
1011 SILC_PACKET_HEADER_LEN +
1012 packetdata.src_id_len +
1013 packetdata.dst_id_len,
1017 packetdata.buffer = sock->outbuf;
1019 /* Encrypt payload of the packet. This is encrypted with the channel key. */
1020 channel->channel_key->cipher->encrypt(channel->channel_key->context,
1021 payload->data, payload->data,
1022 payload->len - 16, /* -IV_LEN */
1025 /* Put the actual encrypted payload data into the buffer. */
1026 silc_buffer_put(sock->outbuf, payload->data, payload->len);
1028 /* Create the outgoing packet */
1029 silc_packet_assemble(&packetdata);
1031 /* Encrypt the header and padding of the packet. This is encrypted
1032 with normal session key shared with our server. */
1033 silc_packet_encrypt(cipher, hmac, sock->outbuf, SILC_PACKET_HEADER_LEN +
1034 packetdata.src_id_len + packetdata.dst_id_len +
1037 SILC_LOG_HEXDUMP(("Packet to channel, len %d", sock->outbuf->len),
1038 sock->outbuf->data, sock->outbuf->len);
1040 /* Now actually send the packet */
1041 silc_client_packet_send_real(client, sock, force_send);
1042 silc_buffer_free(payload);
1043 silc_free(id_string);
1046 /* Sends private message to remote client. If private message key has
1047 not been set with this client then the message will be encrypted using
1048 normal session keys. Private messages are special packets in SILC
1049 network hence we need this own function for them. This is similiar
1050 to silc_client_packet_send_to_channel except that we send private
1053 void silc_client_packet_send_private_message(SilcClient client,
1054 SilcSocketConnection sock,
1055 SilcClientEntry client_entry,
1056 unsigned char *data,
1057 unsigned int data_len,
1060 SilcClientConnection conn = (SilcClientConnection)sock->user_data;
1062 SilcPacketContext packetdata;
1063 unsigned int nick_len;
1067 SILC_LOG_DEBUG(("Sending private message"));
1069 /* Create private message payload */
1070 nick_len = strlen(conn->nickname);
1071 buffer = silc_buffer_alloc(2 + nick_len + data_len);
1072 silc_buffer_pull_tail(buffer, SILC_BUFFER_END(buffer));
1073 silc_buffer_format(buffer,
1074 SILC_STR_UI_SHORT(nick_len),
1075 SILC_STR_UI_XNSTRING(conn->nickname,
1077 SILC_STR_UI_XNSTRING(data, data_len),
1080 /* If we don't have private message specific key then private messages
1081 are just as any normal packet thus call normal packet sending. If
1082 the key exist then the encryption process is a bit different and
1083 will be done in the rest of this function. */
1084 if (!client_entry->send_key) {
1085 silc_client_packet_send(client, sock, SILC_PACKET_PRIVATE_MESSAGE,
1086 client_entry->id, SILC_ID_CLIENT, NULL, NULL,
1087 buffer->data, buffer->len, force_send);
1091 /* We have private message specific key */
1093 /* Get data used in the encryption */
1094 cipher = client_entry->send_key;
1097 /* Set the packet context pointers. */
1098 packetdata.flags = 0;
1099 packetdata.type = SILC_PACKET_PRIVATE_MESSAGE;
1100 packetdata.src_id = conn->local_id_data;
1101 packetdata.src_id_len = SILC_ID_CLIENT_LEN;
1102 packetdata.src_id_type = SILC_ID_CLIENT;
1104 packetdata.dst_id = silc_id_id2str(client_entry->id, SILC_ID_CLIENT);
1106 packetdata.dst_id = conn->local_id_data;
1107 packetdata.dst_id_len = SILC_ID_CLIENT_LEN;
1108 packetdata.dst_id_type = SILC_ID_CLIENT;
1109 packetdata.rng = client->rng;
1110 packetdata.truelen = buffer->len + SILC_PACKET_HEADER_LEN +
1111 packetdata.src_id_len + packetdata.dst_id_len;
1112 packetdata.padlen = SILC_PACKET_PADLEN((SILC_PACKET_HEADER_LEN +
1113 packetdata.src_id_len +
1114 packetdata.dst_id_len));
1116 /* Prepare outgoing data buffer for packet sending */
1117 silc_packet_send_prepare(sock,
1118 SILC_PACKET_HEADER_LEN +
1119 packetdata.src_id_len +
1120 packetdata.dst_id_len,
1124 packetdata.buffer = sock->outbuf;
1126 /* Encrypt payload of the packet. Encrypt with private message specific
1127 key if it exist, otherwise with session key. */
1128 cipher->cipher->encrypt(cipher->context, buffer->data, buffer->data,
1129 buffer->len, cipher->iv);
1131 /* Put the actual encrypted payload data into the buffer. */
1132 silc_buffer_put(sock->outbuf, buffer->data, buffer->len);
1134 /* Create the outgoing packet */
1135 silc_packet_assemble(&packetdata);
1137 /* Encrypt the header and padding of the packet. */
1138 silc_packet_encrypt(cipher, hmac, sock->outbuf, SILC_PACKET_HEADER_LEN +
1139 packetdata.src_id_len + packetdata.dst_id_len +
1142 SILC_LOG_HEXDUMP(("Private message packet, len %d", sock->outbuf->len),
1143 sock->outbuf->data, sock->outbuf->len);
1145 /* Now actually send the packet */
1146 silc_client_packet_send_real(client, sock, force_send);
1147 silc_free(packetdata.dst_id);
1153 /* Closes connection to remote end. Free's all allocated data except
1154 for some information such as nickname etc. that are valid at all time. */
1156 void silc_client_close_connection(SilcClient client,
1157 SilcSocketConnection sock)
1159 SilcClientConnection conn;
1161 /* We won't listen for this connection anymore */
1162 silc_schedule_unset_listen_fd(sock->sock);
1164 /* Unregister all tasks */
1165 silc_task_unregister_by_fd(client->io_queue, sock->sock);
1166 silc_task_unregister_by_fd(client->timeout_queue, sock->sock);
1168 /* Close the actual connection */
1169 silc_net_close_connection(sock->sock);
1171 client->ops->say(client, sock->user_data,
1172 "Closed connection to host %s", sock->hostname ?
1173 sock->hostname : sock->ip);
1175 /* Free everything */
1176 if (sock->user_data) {
1177 conn = (SilcClientConnection)sock->user_data;
1179 /* XXX Free all client entries and channel entries. */
1181 /* Clear ID caches */
1182 silc_idcache_del_all(conn->client_cache);
1183 silc_idcache_del_all(conn->channel_cache);
1186 if (conn->remote_host)
1187 silc_free(conn->remote_host);
1189 silc_free(conn->local_id);
1190 if (conn->local_id_data)
1191 silc_free(conn->local_id_data);
1193 silc_cipher_free(conn->send_key);
1194 if (conn->receive_key)
1195 silc_cipher_free(conn->receive_key);
1197 silc_hmac_free(conn->hmac);
1198 if (conn->hmac_key) {
1199 memset(conn->hmac_key, 0, conn->hmac_key_len);
1200 silc_free(conn->hmac_key);
1204 conn->remote_port = 0;
1205 conn->remote_type = 0;
1206 conn->send_key = NULL;
1207 conn->receive_key = NULL;
1209 conn->hmac_key = NULL;
1210 conn->hmac_key_len = 0;
1211 conn->local_id = NULL;
1212 conn->local_id_data = NULL;
1213 conn->remote_host = NULL;
1214 conn->current_channel = NULL;
1216 silc_client_del_connection(client, conn);
1219 if (sock->protocol) {
1220 silc_protocol_free(sock->protocol);
1221 sock->protocol = NULL;
1223 silc_socket_free(sock);
1226 /* Called when we receive disconnection packet from server. This
1227 closes our end properly and displays the reason of the disconnection
1230 void silc_client_disconnected_by_server(SilcClient client,
1231 SilcSocketConnection sock,
1236 SILC_LOG_DEBUG(("Server disconnected us, sock %d", sock->sock));
1238 msg = silc_calloc(message->len + 1, sizeof(char));
1239 memcpy(msg, message->data, message->len);
1240 client->ops->say(client, sock->user_data, msg);
1243 SILC_SET_DISCONNECTED(sock);
1244 silc_client_close_connection(client, sock);
1247 /* Received error message from server. Display it on the screen.
1248 We don't take any action what so ever of the error message. */
1250 void silc_client_error_by_server(SilcClient client,
1251 SilcSocketConnection sock,
1256 msg = silc_calloc(message->len + 1, sizeof(char));
1257 memcpy(msg, message->data, message->len);
1258 client->ops->say(client, sock->user_data, msg);
1262 /* Called when notify is received and some async operation (such as command)
1263 is required before processing the notify message. This calls again the
1264 silc_client_notify_by_server and reprocesses the original notify packet. */
1266 static void silc_client_notify_by_server_pending(void *context)
1268 SilcPacketContext *p = (SilcPacketContext *)context;
1269 silc_client_notify_by_server(p->context, p->sock, p);
1271 silc_free(p->src_id);
1273 silc_free(p->dst_id);
1274 silc_buffer_free(p->buffer);
1278 /* Received notify message from server */
1280 void silc_client_notify_by_server(SilcClient client,
1281 SilcSocketConnection sock,
1282 SilcPacketContext *packet)
1284 SilcBuffer buffer = packet->buffer;
1285 SilcClientConnection conn = (SilcClientConnection)sock->user_data;
1286 SilcNotifyPayload payload;
1287 SilcNotifyType type;
1288 SilcArgumentPayload args;
1291 SilcClientID *client_id = NULL;
1292 SilcChannelID *channel_id = NULL;
1293 SilcClientEntry client_entry;
1294 SilcClientEntry client_entry2;
1295 SilcChannelEntry channel;
1296 SilcChannelUser chu;
1297 SilcIDCacheEntry id_cache = NULL;
1299 unsigned int tmp_len, mode;
1301 payload = silc_notify_payload_parse(buffer);
1302 type = silc_notify_get_type(payload);
1303 args = silc_notify_get_args(payload);
1308 case SILC_NOTIFY_TYPE_NONE:
1309 /* Notify application */
1310 client->ops->notify(client, conn, type,
1311 silc_argument_get_arg_type(args, 1, NULL));
1314 case SILC_NOTIFY_TYPE_INVITE:
1316 * Someone invited me to a channel. Find Client and Channel entries
1317 * for the application.
1321 tmp = silc_argument_get_arg_type(args, 1, &tmp_len);
1325 client_id = silc_id_payload_parse_id(tmp, tmp_len);
1327 /* Find Client entry and if not found query it */
1328 client_entry = silc_idlist_get_client_by_id(client, conn, client_id, TRUE);
1329 if (!client_entry) {
1330 SilcPacketContext *p = silc_packet_context_dup(packet);
1331 p->context = (void *)client;
1333 silc_client_command_pending(SILC_COMMAND_WHOIS,
1334 silc_client_notify_by_server_pending, p);
1338 /* Get Channel ID */
1339 tmp = silc_argument_get_arg_type(args, 2, &tmp_len);
1343 channel_id = silc_id_payload_parse_id(tmp, tmp_len);
1345 /* XXX Will ALWAYS fail because currently we don't have way to resolve
1346 channel information for channel that we're not joined to. */
1347 /* XXX ways to fix: use (extended) LIST command, or define the channel
1348 name to the notfy type when name resolving is not mandatory. */
1349 /* Find channel entry */
1350 if (!silc_idcache_find_by_id_one(conn->channel_cache, (void *)channel_id,
1351 SILC_ID_CHANNEL, &id_cache))
1354 channel = (SilcChannelEntry)id_cache->context;
1356 /* Notify application */
1357 client->ops->notify(client, conn, type, client_entry, channel);
1360 case SILC_NOTIFY_TYPE_JOIN:
1362 * Someone has joined to a channel. Get their ID and nickname and
1363 * cache them for later use.
1367 tmp = silc_argument_get_arg_type(args, 1, &tmp_len);
1371 client_id = silc_id_payload_parse_id(tmp, tmp_len);
1373 /* Find Client entry and if not found query it */
1374 client_entry = silc_idlist_get_client_by_id(client, conn, client_id, TRUE);
1375 if (!client_entry) {
1376 SilcPacketContext *p = silc_packet_context_dup(packet);
1377 p->context = (void *)client;
1379 silc_client_command_pending(SILC_COMMAND_WHOIS,
1380 silc_client_notify_by_server_pending, p);
1384 /* Get channel entry */
1385 channel_id = silc_id_str2id(packet->dst_id, SILC_ID_CHANNEL);
1386 if (!silc_idcache_find_by_id_one(conn->channel_cache, (void *)channel_id,
1387 SILC_ID_CHANNEL, &id_cache))
1390 channel = (SilcChannelEntry)id_cache->context;
1392 /* Add client to channel */
1393 chu = silc_calloc(1, sizeof(*chu));
1394 chu->client = client_entry;
1395 silc_list_add(channel->clients, chu);
1397 /* XXX add support for multiple same nicks on same channel. Check
1400 /* Notify application. The channel entry is sent last as this notify
1401 is for channel but application don't know it from the arguments
1403 client->ops->notify(client, conn, type, client_entry, channel);
1406 case SILC_NOTIFY_TYPE_LEAVE:
1408 * Someone has left a channel. We will remove it from the channel but
1409 * we'll keep it in the cache in case we'll need it later.
1413 tmp = silc_argument_get_arg_type(args, 1, &tmp_len);
1417 client_id = silc_id_payload_parse_id(tmp, tmp_len);
1419 /* Find Client entry */
1421 silc_idlist_get_client_by_id(client, conn, client_id, FALSE);
1425 /* Get channel entry */
1426 channel_id = silc_id_str2id(packet->dst_id, SILC_ID_CHANNEL);
1427 if (!silc_idcache_find_by_id_one(conn->channel_cache, (void *)channel_id,
1428 SILC_ID_CHANNEL, &id_cache))
1431 channel = (SilcChannelEntry)id_cache->context;
1433 /* Remove client from channel */
1434 silc_list_start(channel->clients);
1435 while ((chu = silc_list_get(channel->clients)) != SILC_LIST_END) {
1436 if (chu->client == client_entry) {
1437 silc_list_del(channel->clients, chu);
1443 /* Notify application. The channel entry is sent last as this notify
1444 is for channel but application don't know it from the arguments
1446 client->ops->notify(client, conn, type, client_entry, channel);
1449 case SILC_NOTIFY_TYPE_SIGNOFF:
1451 * Someone left SILC. We'll remove it from all channels and from cache.
1455 tmp = silc_argument_get_arg_type(args, 1, &tmp_len);
1459 client_id = silc_id_payload_parse_id(tmp, tmp_len);
1461 /* Find Client entry */
1463 silc_idlist_get_client_by_id(client, conn, client_id, FALSE);
1467 /* Remove from all channels */
1468 silc_client_remove_from_channels(client, conn, client_entry);
1470 /* Remove from cache */
1471 silc_idcache_del_by_id(conn->client_cache, SILC_ID_CLIENT,
1474 /* Notify application */
1475 client->ops->notify(client, conn, type, client_entry);
1478 if (client_entry->nickname)
1479 silc_free(client_entry->nickname);
1480 if (client_entry->server)
1481 silc_free(client_entry->server);
1482 if (client_entry->id)
1483 silc_free(client_entry->id);
1484 if (client_entry->send_key)
1485 silc_cipher_free(client_entry->send_key);
1486 if (client_entry->receive_key)
1487 silc_cipher_free(client_entry->receive_key);
1490 case SILC_NOTIFY_TYPE_TOPIC_SET:
1492 * Someone set the topic on a channel.
1496 tmp = silc_argument_get_arg_type(args, 1, &tmp_len);
1500 client_id = silc_id_payload_parse_id(tmp, tmp_len);
1502 /* Find Client entry */
1504 silc_idlist_get_client_by_id(client, conn, client_id, FALSE);
1509 tmp = silc_argument_get_arg_type(args, 2, &tmp_len);
1513 /* Get channel entry */
1514 channel_id = silc_id_str2id(packet->dst_id, SILC_ID_CHANNEL);
1515 if (!silc_idcache_find_by_id_one(conn->channel_cache, (void *)channel_id,
1516 SILC_ID_CHANNEL, &id_cache))
1519 channel = (SilcChannelEntry)id_cache->context;
1521 /* Notify application. The channel entry is sent last as this notify
1522 is for channel but application don't know it from the arguments
1524 client->ops->notify(client, conn, type, client_entry, tmp, channel);
1527 case SILC_NOTIFY_TYPE_NICK_CHANGE:
1529 * Someone changed their nickname. If we don't have entry for the new
1530 * ID we will query it and return here after it's done. After we've
1531 * returned we fetch the old entry and free it and notify the
1535 /* Get new Client ID */
1536 tmp = silc_argument_get_arg_type(args, 2, &tmp_len);
1540 client_id = silc_id_payload_parse_id(tmp, tmp_len);
1543 if (!SILC_ID_CLIENT_COMPARE(client_id, conn->local_id))
1546 /* Find Client entry and if not found query it */
1548 silc_idlist_get_client_by_id(client, conn, client_id, TRUE);
1549 if (!client_entry2) {
1550 SilcPacketContext *p = silc_packet_context_dup(packet);
1551 p->context = (void *)client;
1553 silc_client_command_pending(SILC_COMMAND_WHOIS,
1554 silc_client_notify_by_server_pending, p);
1558 /* Get old Client ID */
1559 tmp = silc_argument_get_arg_type(args, 1, &tmp_len);
1563 client_id = silc_id_payload_parse_id(tmp, tmp_len);
1565 /* Find old Client entry */
1567 silc_idlist_get_client_by_id(client, conn, client_id, FALSE);
1571 /* Remove the old from cache */
1572 silc_idcache_del_by_id(conn->client_cache, SILC_ID_CLIENT,
1575 /* Replace old ID entry with new one on all channels. */
1576 silc_client_replace_from_channels(client, conn, client_entry,
1579 /* Notify application */
1580 client->ops->notify(client, conn, type, client_entry, client_entry2);
1583 if (client_entry->nickname)
1584 silc_free(client_entry->nickname);
1585 if (client_entry->server)
1586 silc_free(client_entry->server);
1587 if (client_entry->id)
1588 silc_free(client_entry->id);
1589 if (client_entry->send_key)
1590 silc_cipher_free(client_entry->send_key);
1591 if (client_entry->receive_key)
1592 silc_cipher_free(client_entry->receive_key);
1595 case SILC_NOTIFY_TYPE_CMODE_CHANGE:
1597 * Someone changed a channel mode
1601 tmp = silc_argument_get_arg_type(args, 1, &tmp_len);
1605 client_id = silc_id_payload_parse_id(tmp, tmp_len);
1607 /* Find Client entry */
1609 silc_idlist_get_client_by_id(client, conn, client_id, FALSE);
1614 tmp = silc_argument_get_arg_type(args, 2, &tmp_len);
1618 SILC_GET32_MSB(mode, tmp);
1620 /* Get channel entry */
1621 channel_id = silc_id_str2id(packet->dst_id, SILC_ID_CHANNEL);
1622 if (!silc_idcache_find_by_id_one(conn->channel_cache, (void *)channel_id,
1623 SILC_ID_CHANNEL, &id_cache))
1626 channel = (SilcChannelEntry)id_cache->context;
1628 /* Save the new mode */
1629 channel->mode = mode;
1631 /* Notify application. The channel entry is sent last as this notify
1632 is for channel but application don't know it from the arguments
1634 client->ops->notify(client, conn, type, client_entry, mode, channel);
1637 case SILC_NOTIFY_TYPE_CUMODE_CHANGE:
1639 * Someone changed user's mode on a channel
1643 tmp = silc_argument_get_arg_type(args, 1, &tmp_len);
1647 client_id = silc_id_payload_parse_id(tmp, tmp_len);
1649 /* Find Client entry */
1651 silc_idlist_get_client_by_id(client, conn, client_id, FALSE);
1656 tmp = silc_argument_get_arg_type(args, 2, &tmp_len);
1660 SILC_GET32_MSB(mode, tmp);
1662 /* Get target Client ID */
1663 tmp = silc_argument_get_arg_type(args, 3, &tmp_len);
1667 silc_free(client_id);
1668 client_id = silc_id_payload_parse_id(tmp, tmp_len);
1670 /* Find target Client entry */
1672 silc_idlist_get_client_by_id(client, conn, client_id, FALSE);
1676 /* Get channel entry */
1677 channel_id = silc_id_str2id(packet->dst_id, SILC_ID_CHANNEL);
1678 if (!silc_idcache_find_by_id_one(conn->channel_cache, (void *)channel_id,
1679 SILC_ID_CHANNEL, &id_cache))
1682 channel = (SilcChannelEntry)id_cache->context;
1685 silc_list_start(channel->clients);
1686 while ((chu = silc_list_get(channel->clients)) != SILC_LIST_END) {
1687 if (chu->client == client_entry) {
1693 /* Notify application. The channel entry is sent last as this notify
1694 is for channel but application don't know it from the arguments
1696 client->ops->notify(client, conn, type, client_entry, mode,
1697 client_entry2, channel);
1700 case SILC_NOTIFY_TYPE_MOTD:
1702 * Received Message of the day
1706 tmp = silc_argument_get_arg_type(args, 1, &tmp_len);
1710 /* Notify application */
1711 client->ops->notify(client, conn, type, tmp);
1719 silc_notify_payload_free(payload);
1721 silc_free(client_id);
1723 silc_free(channel_id);
1726 /* Processes the received new Client ID from server. Old Client ID is
1727 deleted from cache and new one is added. */
1729 void silc_client_receive_new_id(SilcClient client,
1730 SilcSocketConnection sock,
1733 SilcClientConnection conn = (SilcClientConnection)sock->user_data;
1735 /* Delete old ID from ID cache */
1736 silc_idcache_del_by_id(conn->client_cache, SILC_ID_CLIENT, conn->local_id);
1738 /* Save the new ID */
1740 silc_free(conn->local_id);
1741 if (conn->local_id_data)
1742 silc_free(conn->local_id_data);
1744 conn->local_id = silc_id_payload_get_id(idp);
1745 conn->local_id_data = silc_id_payload_get_data(idp);
1746 conn->local_id_data_len = silc_id_payload_get_len(idp);;
1748 if (!conn->local_entry)
1749 conn->local_entry = silc_calloc(1, sizeof(*conn->local_entry));
1751 conn->local_entry->nickname = conn->nickname;
1752 if (!conn->local_entry->username) {
1753 conn->local_entry->username =
1754 silc_calloc(strlen(client->username) + strlen(client->hostname) + 1,
1755 sizeof(conn->local_entry->username));
1756 sprintf(conn->local_entry->username, "%s@%s", client->username,
1759 conn->local_entry->server = strdup(conn->remote_host);
1760 conn->local_entry->id = conn->local_id;
1762 /* Put it to the ID cache */
1763 silc_idcache_add(conn->client_cache, conn->nickname, SILC_ID_CLIENT,
1764 conn->local_id, (void *)conn->local_entry, TRUE);
1767 /* Processed received Channel ID for a channel. This is called when client
1768 joins to channel and server replies with channel ID. The ID is cached. */
1770 void silc_client_new_channel_id(SilcClient client,
1771 SilcSocketConnection sock,
1773 unsigned int mode, SilcIDPayload idp)
1775 SilcClientConnection conn = (SilcClientConnection)sock->user_data;
1776 SilcChannelEntry channel;
1778 SILC_LOG_DEBUG(("New channel ID"));
1780 channel = silc_calloc(1, sizeof(*channel));
1781 channel->channel_name = channel_name;
1782 channel->id = silc_id_payload_get_id(idp);
1783 channel->mode = mode;
1784 silc_list_init(channel->clients, struct SilcChannelUserStruct, next);
1786 conn->current_channel = channel;
1788 /* Put it to the ID cache */
1789 silc_idcache_add(conn->channel_cache, channel_name, SILC_ID_CHANNEL,
1790 (void *)channel->id, (void *)channel, TRUE);
1793 /* Processes received key for channel. The received key will be used
1794 to protect the traffic on the channel for now on. Client must receive
1795 the key to the channel before talking on the channel is possible.
1796 This is the key that server has generated, this is not the channel
1797 private key, it is entirely local setting. */
1799 void silc_client_receive_channel_key(SilcClient client,
1800 SilcSocketConnection sock,
1803 unsigned char *id_string, *key, *cipher;
1804 unsigned int tmp_len;
1805 SilcClientConnection conn = (SilcClientConnection)sock->user_data;
1807 SilcIDCacheEntry id_cache = NULL;
1808 SilcChannelEntry channel;
1809 SilcChannelKeyPayload payload;
1811 SILC_LOG_DEBUG(("Received key for channel"));
1813 payload = silc_channel_key_payload_parse(packet);
1817 id_string = silc_channel_key_get_id(payload, &tmp_len);
1819 silc_channel_key_payload_free(payload);
1822 id = silc_id_payload_parse_id(id_string, tmp_len);
1825 if (!silc_idcache_find_by_id_one(conn->channel_cache, (void *)id,
1826 SILC_ID_CHANNEL, &id_cache))
1830 key = silc_channel_key_get_key(payload, &tmp_len);
1831 cipher = silc_channel_key_get_cipher(payload, NULL);
1833 channel = (SilcChannelEntry)id_cache->context;
1834 channel->key_len = tmp_len;
1835 channel->key = silc_calloc(tmp_len, sizeof(*channel->key));
1836 memcpy(channel->key, key, tmp_len);
1838 if (!silc_cipher_alloc(cipher, &channel->channel_key)) {
1839 client->ops->say(client, conn,
1840 "Cannot talk to channel: unsupported cipher %s", cipher);
1843 channel->channel_key->cipher->set_key(channel->channel_key->context,
1846 /* Client is now joined to the channel */
1847 channel->on_channel = TRUE;
1851 silc_channel_key_payload_free(payload);
1854 /* Process received message to a channel (or from a channel, really). This
1855 decrypts the channel message with channel specific key and parses the
1856 channel payload. Finally it displays the message on the screen. */
1858 void silc_client_channel_message(SilcClient client,
1859 SilcSocketConnection sock,
1860 SilcPacketContext *packet)
1862 SilcClientConnection conn = (SilcClientConnection)sock->user_data;
1863 SilcBuffer buffer = packet->buffer;
1864 SilcChannelPayload payload = NULL;
1865 SilcChannelID *id = NULL;
1866 SilcChannelEntry channel;
1867 SilcChannelUser chu;
1868 SilcIDCacheEntry id_cache = NULL;
1869 SilcClientID *client_id = NULL;
1874 if (packet->dst_id_type != SILC_ID_CHANNEL)
1877 client_id = silc_id_str2id(packet->src_id, SILC_ID_CLIENT);
1878 id = silc_id_str2id(packet->dst_id, SILC_ID_CHANNEL);
1880 /* Find the channel entry from channels on this connection */
1881 if (!silc_idcache_find_by_id_one(conn->channel_cache, (void *)id,
1882 SILC_ID_CHANNEL, &id_cache))
1885 channel = (SilcChannelEntry)id_cache->context;
1887 /* Decrypt the channel message payload. Push the IV out of the way,
1888 since it is not encrypted (after pushing buffer->tail has the IV). */
1889 silc_buffer_push_tail(buffer, 16);
1890 channel->channel_key->cipher->decrypt(channel->channel_key->context,
1891 buffer->data, buffer->data,
1892 buffer->len, buffer->tail);
1893 silc_buffer_pull_tail(buffer, 16);
1895 /* Parse the channel message payload */
1896 payload = silc_channel_payload_parse(buffer);
1901 nickname = "[unknown]";
1902 silc_list_start(channel->clients);
1903 while ((chu = silc_list_get(channel->clients)) != SILC_LIST_END) {
1904 if (!SILC_ID_CLIENT_COMPARE(chu->client->id, client_id)) {
1905 nickname = chu->client->nickname;
1910 /* Pass the message to application */
1911 client->ops->channel_message(client, conn, nickname,
1912 channel->channel_name,
1913 silc_channel_get_data(payload, NULL));
1919 silc_free(client_id);
1921 silc_channel_payload_free(payload);
1924 /* Private message received. This processes the private message and
1925 finally displays it on the screen. */
1927 void silc_client_private_message(SilcClient client,
1928 SilcSocketConnection sock,
1929 SilcPacketContext *packet)
1931 SilcClientConnection conn = (SilcClientConnection)sock->user_data;
1932 SilcBuffer buffer = packet->buffer;
1933 unsigned short nick_len;
1934 unsigned char *nickname, *message;
1937 silc_buffer_unformat(buffer,
1938 SILC_STR_UI16_NSTRING_ALLOC(&nickname, &nick_len),
1940 silc_buffer_pull(buffer, 2 + nick_len);
1942 message = silc_calloc(buffer->len + 1, sizeof(char));
1943 memcpy(message, buffer->data, buffer->len);
1945 /* Pass the private message to application */
1946 client->ops->private_message(client, conn, nickname, message);
1948 /* See if we are away (gone). If we are away we will reply to the
1949 sender with the set away message. */
1950 if (conn->away && conn->away->away) {
1951 SilcClientID *remote_id;
1952 SilcClientEntry remote_client;
1953 SilcIDCacheEntry id_cache;
1955 if (packet->src_id_type != SILC_ID_CLIENT)
1958 remote_id = silc_id_str2id(packet->src_id, SILC_ID_CLIENT);
1962 /* If it's me, ignore */
1963 if (!SILC_ID_CLIENT_COMPARE(remote_id, conn->local_id))
1966 /* Check whether we know this client already */
1967 if (!silc_idcache_find_by_id_one(conn->client_cache, remote_id,
1968 SILC_ID_CLIENT, &id_cache))
1970 /* Allocate client entry */
1971 remote_client = silc_calloc(1, sizeof(*remote_client));
1972 remote_client->id = remote_id;
1973 silc_parse_nickname(nickname, &remote_client->nickname,
1974 &remote_client->server, &remote_client->num);
1976 /* Save the client to cache */
1977 silc_idcache_add(conn->client_cache, remote_client->nickname,
1978 SILC_ID_CLIENT, remote_client->id, remote_client,
1981 silc_free(remote_id);
1982 remote_client = (SilcClientEntry)id_cache->context;
1985 /* Send the away message */
1986 silc_client_packet_send_private_message(client, sock, remote_client,
1988 strlen(conn->away->away), TRUE);
1992 memset(message, 0, buffer->len);
1994 silc_free(nickname);
1997 /* Removes a client entry from all channel it has joined. This really is
1998 a performance killer (client_entry should have pointers to channel
2001 void silc_client_remove_from_channels(SilcClient client,
2002 SilcClientConnection conn,
2003 SilcClientEntry client_entry)
2005 SilcIDCacheEntry id_cache;
2006 SilcIDCacheList list;
2007 SilcChannelEntry channel;
2008 SilcChannelUser chu;
2011 if (!silc_idcache_find_by_id(conn->channel_cache, SILC_ID_CACHE_ANY,
2012 SILC_ID_CHANNEL, &list))
2015 silc_idcache_list_first(list, &id_cache);
2016 channel = (SilcChannelEntry)id_cache->context;
2020 /* Remove client from channel */
2021 silc_list_start(channel->clients);
2022 while ((chu = silc_list_get(channel->clients)) != SILC_LIST_END) {
2023 if (chu->client == client_entry) {
2024 silc_list_del(channel->clients, chu);
2030 if (!silc_idcache_list_next(list, &id_cache))
2033 channel = (SilcChannelEntry)id_cache->context;
2036 silc_idcache_list_free(list);
2039 /* Replaces `old' client entries from all channels to `new' client entry.
2040 This can be called for example when nickname changes and old ID entry
2041 is replaced from ID cache with the new one. If the old ID entry is only
2042 updated, then this fucntion needs not to be called. */
2044 void silc_client_replace_from_channels(SilcClient client,
2045 SilcClientConnection conn,
2046 SilcClientEntry old,
2047 SilcClientEntry new)
2049 SilcIDCacheEntry id_cache;
2050 SilcIDCacheList list;
2051 SilcChannelEntry channel;
2052 SilcChannelUser chu;
2055 if (!silc_idcache_find_by_id(conn->channel_cache, SILC_ID_CACHE_ANY,
2056 SILC_ID_CHANNEL, &list))
2059 silc_idcache_list_first(list, &id_cache);
2060 channel = (SilcChannelEntry)id_cache->context;
2064 /* Replace client entry */
2065 silc_list_start(channel->clients);
2066 while ((chu = silc_list_get(channel->clients)) != SILC_LIST_END) {
2067 if (chu->client == old) {
2073 if (!silc_idcache_list_next(list, &id_cache))
2076 channel = (SilcChannelEntry)id_cache->context;
2079 silc_idcache_list_free(list);
2082 /* Parses mode mask and returns the mode as string. */
2084 char *silc_client_chmode(unsigned int mode)
2091 memset(string, 0, sizeof(string));
2093 if (mode & SILC_CHANNEL_MODE_PRIVATE)
2094 strncat(string, "p", 1);
2096 if (mode & SILC_CHANNEL_MODE_SECRET)
2097 strncat(string, "s", 1);
2099 if (mode & SILC_CHANNEL_MODE_PRIVKEY)
2100 strncat(string, "k", 1);
2102 if (mode & SILC_CHANNEL_MODE_INVITE)
2103 strncat(string, "i", 1);
2105 if (mode & SILC_CHANNEL_MODE_TOPIC)
2106 strncat(string, "t", 1);
2108 if (mode & SILC_CHANNEL_MODE_ULIMIT)
2109 strncat(string, "l", 1);
2111 if (mode & SILC_CHANNEL_MODE_PASSPHRASE)
2112 strncat(string, "a", 1);
2114 /* Rest of mode is ignored */
2116 return strdup(string);
2119 /* Parses channel user mode mask and returns te mode as string */
2121 char *silc_client_chumode(unsigned int mode)
2128 memset(string, 0, sizeof(string));
2130 if (mode & SILC_CHANNEL_UMODE_CHANFO)
2131 strncat(string, "f", 1);
2133 if (mode & SILC_CHANNEL_UMODE_CHANOP)
2134 strncat(string, "o", 1);
2136 return strdup(string);
2139 /* Parses channel user mode and returns it as special mode character. */
2141 char *silc_client_chumode_char(unsigned int mode)
2148 memset(string, 0, sizeof(string));
2150 if (mode & SILC_CHANNEL_UMODE_CHANFO)
2151 strncat(string, "*", 1);
2153 if (mode & SILC_CHANNEL_UMODE_CHANOP)
2154 strncat(string, "@", 1);
2156 return strdup(string);