/* packet_receive.c Author: Pekka Riikonen Copyright (C) 1997 - 2001 Pekka Riikonen This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. */ /* * Server packet routines to handle received packets. */ /* $Id$ */ #include "serverincludes.h" #include "server_internal.h" extern char *server_version; /* Received notify packet. Server can receive notify packets from router. Server then relays the notify messages to clients if needed. */ void silc_server_notify(SilcServer server, SilcSocketConnection sock, SilcPacketContext *packet) { SilcNotifyPayload payload; SilcNotifyType type; SilcArgumentPayload args; SilcChannelID *channel_id; SilcClientID *client_id, *client_id2; SilcChannelEntry channel; SilcClientEntry client; SilcChannelClientEntry chl; SilcIDCacheEntry cache; unsigned int mode; unsigned char *tmp; unsigned int tmp_len; SILC_LOG_DEBUG(("Start")); if (sock->type == SILC_SOCKET_TYPE_CLIENT || packet->src_id_type != SILC_ID_SERVER) return; if (!packet->dst_id) return; /* If the packet is destined directly to a client then relay the packet before processing it. */ if (packet->dst_id_type == SILC_ID_CLIENT) { SilcIDListData idata; SilcSocketConnection dst_sock; /* Get the route to the client */ dst_sock = silc_server_get_client_route(server, packet->dst_id, packet->dst_id_len, &idata); if (dst_sock) /* Relay the packet */ silc_server_relay_packet(server, dst_sock, idata->send_key, idata->hmac, packet, TRUE); } /* If we are router and this packet is not already broadcast packet we will broadcast it. The sending socket really cannot be router or the router is buggy. If this packet is coming from router then it must have the broadcast flag set already and we won't do anything. */ if (!server->standalone && server->server_type == SILC_ROUTER && sock->type == SILC_SOCKET_TYPE_SERVER && !(packet->flags & SILC_PACKET_FLAG_BROADCAST)) { SILC_LOG_DEBUG(("Broadcasting received Notify packet")); silc_server_packet_send(server, server->router->connection, packet->type, packet->flags | SILC_PACKET_FLAG_BROADCAST, packet->buffer->data, packet->buffer->len, FALSE); } payload = silc_notify_payload_parse(packet->buffer); if (!payload) return; type = silc_notify_get_type(payload); args = silc_notify_get_args(payload); if (!args) goto out; switch(type) { case SILC_NOTIFY_TYPE_JOIN: /* * Distribute the notify to local clients on the channel */ SILC_LOG_DEBUG(("JOIN notify")); /* Get Channel ID */ tmp = silc_argument_get_arg_type(args, 2, &tmp_len); if (!tmp) goto out; channel_id = silc_id_payload_parse_id(tmp, tmp_len); if (!channel_id) goto out; /* Get channel entry */ channel = silc_idlist_find_channel_by_id(server->global_list, channel_id, NULL); if (!channel) { channel = silc_idlist_find_channel_by_id(server->local_list, channel_id, NULL); if (!channel) { silc_free(channel_id); goto out; } } silc_free(channel_id); /* Get client ID */ tmp = silc_argument_get_arg_type(args, 1, &tmp_len); if (!tmp) goto out; client_id = silc_id_payload_parse_id(tmp, tmp_len); if (!client_id) goto out; /* Send to channel */ silc_server_packet_send_to_channel(server, sock, channel, packet->type, FALSE, packet->buffer->data, packet->buffer->len, FALSE); /* If the the client is not in local list we check global list (ie. the channel will be global channel) and if it does not exist then create entry for the client. */ client = silc_idlist_find_client_by_id(server->global_list, client_id, NULL); if (!client) { client = silc_idlist_find_client_by_id(server->local_list, client_id, NULL); if (!client) { /* If router did not find the client the it is bogus */ if (server->server_type == SILC_ROUTER) goto out; client = silc_idlist_add_client(server->global_list, NULL, 0, NULL, NULL, silc_id_dup(client_id, SILC_ID_CLIENT), sock->user_data, NULL); if (!client) { silc_free(client_id); goto out; } client->data.registered = TRUE; } } /* Do not add client to channel if it is there already */ if (silc_server_client_on_channel(client, channel)) break; if (server->server_type == SILC_SERVER && sock->type == SILC_SOCKET_TYPE_ROUTER) /* The channel is global now */ channel->global_users = TRUE; /* JOIN the global client to the channel (local clients (if router created the channel) is joined in the pending JOIN command). */ chl = silc_calloc(1, sizeof(*chl)); chl->client = client; chl->channel = channel; silc_list_add(channel->user_list, chl); silc_list_add(client->channels, chl); silc_free(client_id); break; case SILC_NOTIFY_TYPE_LEAVE: /* * Distribute the notify to local clients on the channel */ SILC_LOG_DEBUG(("LEAVE notify")); channel_id = silc_id_str2id(packet->dst_id, packet->dst_id_len, packet->dst_id_type); if (!channel_id) goto out; /* Get channel entry */ channel = silc_idlist_find_channel_by_id(server->global_list, channel_id, NULL); if (!channel) { channel = silc_idlist_find_channel_by_id(server->local_list, channel_id, NULL); if (!channel) { silc_free(channel_id); goto out; } } /* Get client ID */ tmp = silc_argument_get_arg_type(args, 1, &tmp_len); if (!tmp) { silc_free(channel_id); goto out; } client_id = silc_id_payload_parse_id(tmp, tmp_len); if (!client_id) { silc_free(channel_id); goto out; } /* Send to channel */ silc_server_packet_send_to_channel(server, sock, channel, packet->type, FALSE, packet->buffer->data, packet->buffer->len, FALSE); /* Get client entry */ client = silc_idlist_find_client_by_id(server->global_list, client_id, NULL); if (!client) { client = silc_idlist_find_client_by_id(server->local_list, client_id, NULL); if (!client) { silc_free(client_id); silc_free(channel_id); goto out; } } silc_free(client_id); /* Remove the user from channel */ silc_server_remove_from_one_channel(server, sock, channel, client, FALSE); break; case SILC_NOTIFY_TYPE_SIGNOFF: /* * Distribute the notify to local clients on the channel */ SILC_LOG_DEBUG(("SIGNOFF notify")); /* Get client ID */ tmp = silc_argument_get_arg_type(args, 1, &tmp_len); if (!tmp) goto out; client_id = silc_id_payload_parse_id(tmp, tmp_len); if (!client_id) goto out; /* Get client entry */ client = silc_idlist_find_client_by_id(server->global_list, client_id, &cache); if (!client) { client = silc_idlist_find_client_by_id(server->local_list, client_id, &cache); if (!client) { silc_free(client_id); goto out; } } silc_free(client_id); /* Get signoff message */ tmp = silc_argument_get_arg_type(args, 2, &tmp_len); if (tmp_len > 128) tmp = NULL; /* Remove the client from all channels */ silc_server_remove_from_channels(server, NULL, client, TRUE, tmp, TRUE); client->data.registered = FALSE; cache->expire = SILC_ID_CACHE_EXPIRE_DEF; #if 0 /* Remove the client entry */ if (!silc_idlist_del_client(server->global_list, client)) silc_idlist_del_client(server->local_list, client); #endif break; case SILC_NOTIFY_TYPE_TOPIC_SET: /* * Distribute the notify to local clients on the channel */ SILC_LOG_DEBUG(("TOPIC SET notify")); channel_id = silc_id_str2id(packet->dst_id, packet->dst_id_len, packet->dst_id_type); if (!channel_id) goto out; /* Get channel entry */ channel = silc_idlist_find_channel_by_id(server->global_list, channel_id, NULL); if (!channel) { channel = silc_idlist_find_channel_by_id(server->local_list, channel_id, NULL); if (!channel) { silc_free(channel_id); goto out; } } /* Get the topic */ tmp = silc_argument_get_arg_type(args, 2, &tmp_len); if (!tmp) { silc_free(channel_id); goto out; } if (channel->topic) silc_free(channel->topic); channel->topic = silc_calloc(tmp_len, sizeof(*channel->topic)); memcpy(channel->topic, tmp, tmp_len); /* Send the same notify to the channel */ silc_server_packet_send_to_channel(server, sock, channel, packet->type, FALSE, packet->buffer->data, packet->buffer->len, FALSE); silc_free(channel_id); break; case SILC_NOTIFY_TYPE_NICK_CHANGE: { /* * Distribute the notify to local clients on the channel */ unsigned char *id, *id2; SILC_LOG_DEBUG(("NICK CHANGE notify")); /* Get old client ID */ id = silc_argument_get_arg_type(args, 1, &tmp_len); if (!id) goto out; client_id = silc_id_payload_parse_id(id, tmp_len); if (!client_id) goto out; /* Get new client ID */ id2 = silc_argument_get_arg_type(args, 2, &tmp_len); if (!id2) goto out; client_id2 = silc_id_payload_parse_id(id2, tmp_len); if (!client_id2) goto out; SILC_LOG_DEBUG(("Old Client ID id(%s)", silc_id_render(client_id, SILC_ID_CLIENT))); SILC_LOG_DEBUG(("New Client ID id(%s)", silc_id_render(client_id2, SILC_ID_CLIENT))); /* Replace the Client ID */ client = silc_idlist_replace_client_id(server->global_list, client_id, client_id2); if (!client) client = silc_idlist_replace_client_id(server->local_list, client_id, client_id2); if (client) { /* The nickname is not valid anymore, set it NULL. This causes that the nickname will be queried if someone wants to know it. */ if (client->nickname) silc_free(client->nickname); client->nickname = NULL; /* Send the NICK_CHANGE notify type to local clients on the channels this client is joined to. */ silc_server_send_notify_on_channels(server, NULL, client, SILC_NOTIFY_TYPE_NICK_CHANGE, 2, id, tmp_len, id2, tmp_len); } silc_free(client_id); if (!client) silc_free(client_id2); break; } case SILC_NOTIFY_TYPE_CMODE_CHANGE: /* * Distribute the notify to local clients on the channel */ SILC_LOG_DEBUG(("CMODE CHANGE notify")); channel_id = silc_id_str2id(packet->dst_id, packet->dst_id_len, packet->dst_id_type); if (!channel_id) goto out; /* Get channel entry */ channel = silc_idlist_find_channel_by_id(server->global_list, channel_id, NULL); if (!channel) { channel = silc_idlist_find_channel_by_id(server->local_list, channel_id, NULL); if (!channel) { silc_free(channel_id); goto out; } } /* Send the same notify to the channel */ silc_server_packet_send_to_channel(server, sock, channel, packet->type, FALSE, packet->buffer->data, packet->buffer->len, FALSE); /* Get the mode */ tmp = silc_argument_get_arg_type(args, 2, &tmp_len); if (!tmp) { silc_free(channel_id); goto out; } SILC_GET32_MSB(mode, tmp); /* Change mode */ channel->mode = mode; silc_free(channel_id); break; case SILC_NOTIFY_TYPE_CUMODE_CHANGE: /* * Distribute the notify to local clients on the channel */ SILC_LOG_DEBUG(("CUMODE CHANGE notify")); channel_id = silc_id_str2id(packet->dst_id, packet->dst_id_len, packet->dst_id_type); if (!channel_id) goto out; /* Get channel entry */ channel = silc_idlist_find_channel_by_id(server->global_list, channel_id, NULL); if (!channel) { channel = silc_idlist_find_channel_by_id(server->local_list, channel_id, NULL); if (!channel) { silc_free(channel_id); goto out; } } /* Get the mode */ tmp = silc_argument_get_arg_type(args, 2, &tmp_len); if (!tmp) { silc_free(channel_id); goto out; } SILC_GET32_MSB(mode, tmp); /* Get target client */ tmp = silc_argument_get_arg_type(args, 3, &tmp_len); if (!tmp) goto out; client_id = silc_id_payload_parse_id(tmp, tmp_len); if (!client_id) goto out; /* Get client entry */ client = silc_idlist_find_client_by_id(server->global_list, client_id, NULL); if (!client) { client = silc_idlist_find_client_by_id(server->local_list, client_id, NULL); if (!client) { silc_free(client_id); goto out; } } silc_free(client_id); /* Get entry to the channel user list */ silc_list_start(channel->user_list); while ((chl = silc_list_get(channel->user_list)) != SILC_LIST_END) if (chl->client == client) { /* Change the mode */ chl->mode = mode; break; } /* Send the same notify to the channel */ silc_server_packet_send_to_channel(server, sock, channel, packet->type, FALSE, packet->buffer->data, packet->buffer->len, FALSE); silc_free(channel_id); break; case SILC_NOTIFY_TYPE_INVITE: SILC_LOG_DEBUG(("INVITE notify (not-impl XXX)")); break; case SILC_NOTIFY_TYPE_CHANNEL_CHANGE: SILC_LOG_DEBUG(("CHANNEL CHANGE notify (not-impl XXX)")); break; case SILC_NOTIFY_TYPE_SERVER_SIGNOFF: SILC_LOG_DEBUG(("SERVER SIGNOFF notify (not-impl XXX)")); break; case SILC_NOTIFY_TYPE_KICKED: /* * Distribute the notify to local clients on the channel */ SILC_LOG_DEBUG(("KICKED notify")); channel_id = silc_id_str2id(packet->dst_id, packet->dst_id_len, packet->dst_id_type); if (!channel_id) goto out; /* Get channel entry */ channel = silc_idlist_find_channel_by_id(server->global_list, channel_id, NULL); if (!channel) { channel = silc_idlist_find_channel_by_id(server->local_list, channel_id, NULL); if (!channel) { silc_free(channel_id); goto out; } } silc_free(channel_id); /* Get client ID */ tmp = silc_argument_get_arg_type(args, 1, &tmp_len); if (!tmp) goto out; client_id = silc_id_payload_parse_id(tmp, tmp_len); if (!client_id) goto out; /* Send to channel */ silc_server_packet_send_to_channel(server, sock, channel, packet->type, FALSE, packet->buffer->data, packet->buffer->len, FALSE); /* If the the client is not in local list we check global list */ client = silc_idlist_find_client_by_id(server->global_list, client_id, NULL); if (!client) { client = silc_idlist_find_client_by_id(server->local_list, client_id, NULL); if (!client) { silc_free(client_id); goto out; } } /* Remove the client from channel */ silc_server_remove_from_one_channel(server, sock, channel, client, FALSE); break; case SILC_NOTIFY_TYPE_KILLED: { /* * Distribute the notify to local clients on channels */ unsigned char *id; unsigned int id_len; SILC_LOG_DEBUG(("KILLED notify")); /* Get client ID */ id = silc_argument_get_arg_type(args, 1, &id_len); if (!id) goto out; client_id = silc_id_payload_parse_id(id, id_len); if (!client_id) goto out; /* If the the client is not in local list we check global list */ client = silc_idlist_find_client_by_id(server->global_list, client_id, NULL); if (!client) { client = silc_idlist_find_client_by_id(server->local_list, client_id, NULL); if (!client) { silc_free(client_id); goto out; } } silc_free(client_id); /* If the client is one of ours, then close the connection to the client now. This removes the client from all channels as well. */ if (packet->dst_id_type == SILC_ID_CLIENT && client->data.registered && client->connection) { sock = client->connection; silc_server_free_client_data(server, NULL, client, FALSE, NULL); silc_server_close_connection(server, sock); break; } /* Get comment */ tmp = silc_argument_get_arg_type(args, 2, &tmp_len); if (tmp_len > 128) tmp = NULL; /* Send the notify to local clients on the channels except to the client who is killed. */ silc_server_send_notify_on_channels(server, client, client, SILC_NOTIFY_TYPE_KILLED, tmp ? 2 : 1, id, id_len, tmp, tmp_len); /* Remove the client from all channels */ silc_server_remove_from_channels(server, NULL, client, FALSE, NULL, FALSE); break; } case SILC_NOTIFY_TYPE_UMODE_CHANGE: /* * Save the mode of the client. */ SILC_LOG_DEBUG(("UMODE_CHANGE notify")); /* Get client ID */ tmp = silc_argument_get_arg_type(args, 1, &tmp_len); if (!tmp) goto out; client_id = silc_id_payload_parse_id(tmp, tmp_len); if (!client_id) goto out; /* Get client entry */ client = silc_idlist_find_client_by_id(server->global_list, client_id, NULL); if (!client) { client = silc_idlist_find_client_by_id(server->local_list, client_id, NULL); if (!client) { silc_free(client_id); goto out; } } silc_free(client_id); /* Get the mode */ tmp = silc_argument_get_arg_type(args, 2, &tmp_len); if (!tmp) goto out; /* Save the mode */ SILC_GET32_MSB(client->mode, tmp); break; /* Ignore rest of the notify types for now */ case SILC_NOTIFY_TYPE_NONE: case SILC_NOTIFY_TYPE_MOTD: break; default: break; } out: silc_notify_payload_free(payload); } void silc_server_notify_list(SilcServer server, SilcSocketConnection sock, SilcPacketContext *packet) { SilcPacketContext *new; SilcBuffer buffer; unsigned short len; SILC_LOG_DEBUG(("Processing New Notify List")); if (sock->type == SILC_SOCKET_TYPE_CLIENT || packet->src_id_type != SILC_ID_SERVER) return; /* Make copy of the original packet context, except for the actual data buffer, which we will here now fetch from the original buffer. */ new = silc_packet_context_alloc(); new->type = SILC_PACKET_NOTIFY; new->flags = packet->flags; new->src_id = packet->src_id; new->src_id_len = packet->src_id_len; new->src_id_type = packet->src_id_type; new->dst_id = packet->dst_id; new->dst_id_len = packet->dst_id_len; new->dst_id_type = packet->dst_id_type; buffer = silc_buffer_alloc(1024); new->buffer = buffer; while (packet->buffer->len) { SILC_GET16_MSB(len, packet->buffer->data + 2); if (len > packet->buffer->len) break; if (len > buffer->truelen) { silc_buffer_free(buffer); buffer = silc_buffer_alloc(1024 + len); } silc_buffer_pull_tail(buffer, len); silc_buffer_put(buffer, packet->buffer->data, len); /* Process the Notify */ silc_server_notify(server, sock, new); silc_buffer_push_tail(buffer, len); silc_buffer_pull(packet->buffer, len); } silc_buffer_free(buffer); silc_free(new); } /* Received private message. This resolves the destination of the message and sends the packet. This is used by both server and router. If the destination is our locally connected client this sends the packet to the client. This may also send the message for further routing if the destination is not in our server (or router). */ void silc_server_private_message(SilcServer server, SilcSocketConnection sock, SilcPacketContext *packet) { SilcSocketConnection dst_sock; SilcIDListData idata; SILC_LOG_DEBUG(("Start")); if (packet->src_id_type != SILC_ID_CLIENT || packet->dst_id_type != SILC_ID_CLIENT) return; if (!packet->dst_id) return; /* Get the route to the client */ dst_sock = silc_server_get_client_route(server, packet->dst_id, packet->dst_id_len, &idata); if (!dst_sock) return; /* Send the private message */ silc_server_send_private_message(server, dst_sock, idata->send_key, idata->hmac, packet); } /* Received private message key packet.. This packet is never for us. It is to the client in the packet's destination ID. Sending of this sort of packet equals sending private message, ie. it is sent point to point from one client to another. */ void silc_server_private_message_key(SilcServer server, SilcSocketConnection sock, SilcPacketContext *packet) { SilcSocketConnection dst_sock; SilcIDListData idata; SILC_LOG_DEBUG(("Start")); if (packet->src_id_type != SILC_ID_CLIENT || packet->dst_id_type != SILC_ID_CLIENT) return; if (!packet->dst_id) return; /* Get the route to the client */ dst_sock = silc_server_get_client_route(server, packet->dst_id, packet->dst_id_len, &idata); if (!dst_sock) return; /* Relay the packet */ silc_server_relay_packet(server, dst_sock, idata->send_key, idata->hmac, packet, FALSE); } /* Processes incoming command reply packet. The command reply packet may be destined to one of our clients or it may directly for us. We will call the command reply routine after processing the packet. */ void silc_server_command_reply(SilcServer server, SilcSocketConnection sock, SilcPacketContext *packet) { SilcBuffer buffer = packet->buffer; SilcClientEntry client = NULL; SilcSocketConnection dst_sock; SilcIDListData idata; SilcClientID *id = NULL; SILC_LOG_DEBUG(("Start")); /* Source must be server or router */ if (packet->src_id_type != SILC_ID_SERVER && sock->type != SILC_SOCKET_TYPE_ROUTER) return; if (packet->dst_id_type == SILC_ID_CHANNEL) return; if (packet->dst_id_type == SILC_ID_CLIENT) { /* Destination must be one of ours */ id = silc_id_str2id(packet->dst_id, packet->dst_id_len, SILC_ID_CLIENT); if (!id) return; client = silc_idlist_find_client_by_id(server->local_list, id, NULL); if (!client) { SILC_LOG_ERROR(("Cannot process command reply to unknown client")); silc_free(id); return; } } if (packet->dst_id_type == SILC_ID_SERVER) { /* For now this must be for us */ if (SILC_ID_SERVER_COMPARE(packet->dst_id, server->id_string)) { SILC_LOG_ERROR(("Cannot process command reply to unknown server")); return; } } /* Execute command reply locally for the command */ silc_server_command_reply_process(server, sock, buffer); if (packet->dst_id_type == SILC_ID_CLIENT && client && id) { /* Relay the packet to the client */ dst_sock = (SilcSocketConnection)client->connection; silc_buffer_push(buffer, SILC_PACKET_HEADER_LEN + packet->src_id_len + packet->dst_id_len + packet->padlen); silc_packet_send_prepare(dst_sock, 0, 0, buffer->len); silc_buffer_put(dst_sock->outbuf, buffer->data, buffer->len); idata = (SilcIDListData)client; /* Encrypt packet */ silc_packet_encrypt(idata->send_key, idata->hmac, dst_sock->outbuf, buffer->len); /* Send the packet */ silc_server_packet_send_real(server, dst_sock, TRUE); silc_free(id); } } /* Process received channel message. The message can be originated from client or server. */ void silc_server_channel_message(SilcServer server, SilcSocketConnection sock, SilcPacketContext *packet) { SilcChannelEntry channel = NULL; SilcChannelClientEntry chl; SilcChannelID *id = NULL; void *sender = NULL; SILC_LOG_DEBUG(("Processing channel message")); /* Sanity checks */ if (packet->dst_id_type != SILC_ID_CHANNEL) { SILC_LOG_DEBUG(("Received bad message for channel, dropped")); goto out; } /* Find channel entry */ id = silc_id_str2id(packet->dst_id, packet->dst_id_len, SILC_ID_CHANNEL); if (!id) goto out; channel = silc_idlist_find_channel_by_id(server->local_list, id, NULL); if (!channel) { channel = silc_idlist_find_channel_by_id(server->global_list, id, NULL); if (!channel) { SILC_LOG_DEBUG(("Could not find channel")); goto out; } } /* See that this client is on the channel. If the message is coming from router we won't do the check as the message is from client that we don't know about. Also, if the original sender is not client (as it can be server as well) we don't do the check. */ sender = silc_id_str2id(packet->src_id, packet->src_id_len, packet->src_id_type); if (!sender) goto out; if (sock->type != SILC_SOCKET_TYPE_ROUTER && packet->src_id_type == SILC_ID_CLIENT) { silc_list_start(channel->user_list); while ((chl = silc_list_get(channel->user_list)) != SILC_LIST_END) { if (chl->client && !SILC_ID_CLIENT_COMPARE(chl->client->id, sender)) break; } if (chl == SILC_LIST_END) { SILC_LOG_DEBUG(("Client not on channel")); goto out; } } /* If we are router and the packet came from router and private key has not been set for the channel then we must encrypt the packet as it was decrypted with the session key shared between us and the router which sent it. This is so, because cells does not share the same channel key */ if (server->server_type == SILC_ROUTER && sock->type == SILC_SOCKET_TYPE_ROUTER && !(channel->mode & SILC_CHANNEL_MODE_PRIVKEY)) { SilcBuffer chp; unsigned int iv_len, i, data_len; iv_len = silc_cipher_get_block_len(channel->channel_key); if (channel->iv[0] == '\0') for (i = 0; i < iv_len; i++) channel->iv[i] = silc_rng_get_byte(server->rng); else silc_hash_make(server->md5hash, channel->iv, iv_len, channel->iv); /* Encode new payload. This encrypts it also. */ SILC_GET16_MSB(data_len, packet->buffer->data); chp = silc_channel_message_payload_encode(data_len, packet->buffer->data + 2, iv_len, channel->iv, channel->channel_key, channel->hmac, server->rng); silc_buffer_put(packet->buffer, chp->data, chp->len); silc_buffer_free(chp); } /* Distribute the packet to our local clients. This will send the packet for further routing as well, if needed. */ silc_server_packet_relay_to_channel(server, sock, channel, sender, packet->src_id_type, packet->buffer->data, packet->buffer->len, FALSE); out: if (sender) silc_free(sender); if (id) silc_free(id); } /* Received channel key packet. We distribute the key to all of our locally connected clients on the channel. */ void silc_server_channel_key(SilcServer server, SilcSocketConnection sock, SilcPacketContext *packet) { SilcBuffer buffer = packet->buffer; SilcChannelEntry channel; if (packet->src_id_type != SILC_ID_SERVER) return; /* Save the channel key */ channel = silc_server_save_channel_key(server, buffer, NULL); if (!channel) return; /* Distribute the key to everybody who is on the channel. If we are router we will also send it to locally connected servers. */ silc_server_send_channel_key(server, sock, channel, FALSE); } /* Received New Client packet and processes it. Creates Client ID for the client. Client becomes registered after calling this functions. */ SilcClientEntry silc_server_new_client(SilcServer server, SilcSocketConnection sock, SilcPacketContext *packet) { SilcBuffer buffer = packet->buffer; SilcClientEntry client; SilcIDCacheEntry cache; SilcClientID *client_id; SilcBuffer reply; SilcIDListData idata; char *username = NULL, *realname = NULL, *id_string; int ret; SILC_LOG_DEBUG(("Creating new client")); if (sock->type != SILC_SOCKET_TYPE_CLIENT) return NULL; /* Take client entry */ client = (SilcClientEntry)sock->user_data; idata = (SilcIDListData)client; /* Fetch the old client cache entry so that we can update it. */ if (!silc_idcache_find_by_context(server->local_list->clients, sock->user_data, &cache)) { SILC_LOG_ERROR(("Lost client's cache entry - bad thing")); return NULL; } /* Parse incoming packet */ ret = silc_buffer_unformat(buffer, SILC_STR_UI16_STRING_ALLOC(&username), SILC_STR_UI16_STRING_ALLOC(&realname), SILC_STR_END); if (ret == -1) { if (username) silc_free(username); if (realname) silc_free(realname); return NULL; } if (!username) { silc_free(username); if (realname) silc_free(realname); silc_server_disconnect_remote(server, sock, "Server closed connection: " "Incomplete client information"); return NULL; } /* Create Client ID */ silc_id_create_client_id(server->id, server->rng, server->md5hash, username, &client_id); if (strlen(username) > 128) username[127] = '\0'; /* Update client entry */ idata->registered = TRUE; client->nickname = strdup(username); client->username = username; client->userinfo = realname ? realname : strdup(" "); client->id = client_id; /* Update the cache entry */ cache->id = (void *)client_id; cache->type = SILC_ID_CLIENT; cache->data = username; silc_idcache_sort_by_data(server->local_list->clients); /* Notify our router about new client on the SILC network */ if (!server->standalone) silc_server_send_new_id(server, (SilcSocketConnection) server->router->connection, server->server_type == SILC_ROUTER ? TRUE : FALSE, client->id, SILC_ID_CLIENT, SILC_ID_CLIENT_LEN); /* Send the new client ID to the client. */ id_string = silc_id_id2str(client->id, SILC_ID_CLIENT); reply = silc_buffer_alloc(2 + 2 + SILC_ID_CLIENT_LEN); silc_buffer_pull_tail(reply, SILC_BUFFER_END(reply)); silc_buffer_format(reply, SILC_STR_UI_SHORT(SILC_ID_CLIENT), SILC_STR_UI_SHORT(SILC_ID_CLIENT_LEN), SILC_STR_UI_XNSTRING(id_string, SILC_ID_CLIENT_LEN), SILC_STR_END); silc_server_packet_send(server, sock, SILC_PACKET_NEW_ID, 0, reply->data, reply->len, FALSE); silc_free(id_string); silc_buffer_free(reply); /* Send some nice info to the client */ SILC_SERVER_SEND_NOTIFY(server, sock, SILC_NOTIFY_TYPE_NONE, ("Welcome to the SILC Network %s@%s", username, sock->hostname)); SILC_SERVER_SEND_NOTIFY(server, sock, SILC_NOTIFY_TYPE_NONE, ("Your host is %s, running version %s", server->config->server_info->server_name, server_version)); if (server->server_type == SILC_ROUTER) { SILC_SERVER_SEND_NOTIFY(server, sock, SILC_NOTIFY_TYPE_NONE, ("There are %d clients on %d servers in SILC " "Network", server->stat.clients, server->stat.servers + 1)); SILC_SERVER_SEND_NOTIFY(server, sock, SILC_NOTIFY_TYPE_NONE, ("There are %d clients on %d server in our cell", server->stat.cell_clients, server->stat.cell_servers + 1)); SILC_SERVER_SEND_NOTIFY(server, sock, SILC_NOTIFY_TYPE_NONE, ("I have %d clients, %d channels, %d servers and " "%d routers", server->stat.my_clients, server->stat.my_channels, server->stat.my_servers, server->stat.my_routers)); SILC_SERVER_SEND_NOTIFY(server, sock, SILC_NOTIFY_TYPE_NONE, ("%d server operators and %d router operators " "online", server->stat.my_server_ops, server->stat.my_router_ops)); } else { SILC_SERVER_SEND_NOTIFY(server, sock, SILC_NOTIFY_TYPE_NONE, ("I have %d clients and %d channels formed", server->stat.my_clients, server->stat.my_channels)); SILC_SERVER_SEND_NOTIFY(server, sock, SILC_NOTIFY_TYPE_NONE, ("%d operators online", server->stat.my_server_ops)); } SILC_SERVER_SEND_NOTIFY(server, sock, SILC_NOTIFY_TYPE_NONE, ("Your connection is secured with %s cipher, " "key length %d bits", idata->send_key->cipher->name, idata->send_key->cipher->key_len)); SILC_SERVER_SEND_NOTIFY(server, sock, SILC_NOTIFY_TYPE_NONE, ("Your current nickname is %s", client->nickname)); /* Send motd */ silc_server_send_motd(server, sock); return client; } /* Create new server. This processes received New Server packet and saves the received Server ID. The server is our locally connected server thus we save all the information and save it to local list. This funtion can be used by both normal server and router server. If normal server uses this it means that its router has connected to the server. If router uses this it means that one of the cell's servers is connected to the router. */ SilcServerEntry silc_server_new_server(SilcServer server, SilcSocketConnection sock, SilcPacketContext *packet) { SilcBuffer buffer = packet->buffer; SilcServerEntry new_server; SilcIDCacheEntry cache; SilcServerID *server_id; SilcIDListData idata; unsigned char *server_name, *id_string; unsigned short id_len, name_len; int ret; SILC_LOG_DEBUG(("Creating new server")); if (sock->type != SILC_SOCKET_TYPE_SERVER && sock->type != SILC_SOCKET_TYPE_ROUTER) return NULL; /* Take server entry */ new_server = (SilcServerEntry)sock->user_data; idata = (SilcIDListData)new_server; /* Fetch the old server cache entry so that we can update it. */ if (!silc_idcache_find_by_context(server->local_list->servers, sock->user_data, &cache)) { SILC_LOG_ERROR(("Lost server's cache entry - bad thing")); return NULL; } /* Parse the incoming packet */ ret = silc_buffer_unformat(buffer, SILC_STR_UI16_NSTRING_ALLOC(&id_string, &id_len), SILC_STR_UI16_NSTRING_ALLOC(&server_name, &name_len), SILC_STR_END); if (ret == -1) { if (id_string) silc_free(id_string); if (server_name) silc_free(server_name); return NULL; } if (id_len > buffer->len) { silc_free(id_string); silc_free(server_name); return NULL; } if (name_len > 256) server_name[255] = '\0'; /* Get Server ID */ server_id = silc_id_str2id(id_string, id_len, SILC_ID_SERVER); if (!server_id) { silc_free(id_string); silc_free(server_name); return NULL; } silc_free(id_string); /* Update client entry */ idata->registered = TRUE; new_server->server_name = server_name; new_server->id = server_id; /* Update the cache entry */ cache->id = (void *)server_id; cache->type = SILC_ID_SERVER; cache->data = server_name; silc_idcache_sort_by_data(server->local_list->servers); /* Distribute the information about new server in the SILC network to our router. If we are normal server we won't send anything since this connection must be our router connection. */ if (server->server_type == SILC_ROUTER && !server->standalone && server->router->connection != sock) silc_server_send_new_id(server, server->router->connection, TRUE, new_server->id, SILC_ID_SERVER, SILC_ID_SERVER_LEN); if (server->server_type == SILC_ROUTER) server->stat.cell_servers++; return new_server; } /* Processes incoming New ID packet. New ID Payload is used to distribute information about newly registered clients and servers. */ static void silc_server_new_id_real(SilcServer server, SilcSocketConnection sock, SilcPacketContext *packet, int broadcast) { SilcBuffer buffer = packet->buffer; SilcIDList id_list; SilcServerEntry router; SilcSocketConnection router_sock; SilcIDPayload idp; SilcIdType id_type; unsigned char *hash = NULL; void *id; SILC_LOG_DEBUG(("Processing new ID")); if (sock->type == SILC_SOCKET_TYPE_CLIENT || server->server_type == SILC_SERVER || packet->src_id_type != SILC_ID_SERVER) return; idp = silc_id_payload_parse(buffer); if (!idp) return; id_type = silc_id_payload_get_type(idp); /* Normal server cannot have other normal server connections */ if (id_type == SILC_ID_SERVER && sock->type == SILC_SOCKET_TYPE_SERVER) goto out; id = silc_id_payload_get_id(idp); if (!id) goto out; /* If the sender of this packet is server and we are router we need to broadcast this packet to other routers in the network. */ if (broadcast && !server->standalone && server->server_type == SILC_ROUTER && sock->type == SILC_SOCKET_TYPE_SERVER && !(packet->flags & SILC_PACKET_FLAG_BROADCAST)) { SILC_LOG_DEBUG(("Broadcasting received New ID packet")); silc_server_packet_send(server, server->router->connection, packet->type, packet->flags | SILC_PACKET_FLAG_BROADCAST, buffer->data, buffer->len, FALSE); } if (sock->type == SILC_SOCKET_TYPE_SERVER) id_list = server->local_list; else id_list = server->global_list; router_sock = sock; router = sock->user_data; switch(id_type) { case SILC_ID_CLIENT: { SilcClientEntry entry; SILC_LOG_DEBUG(("New client id(%s) from [%s] %s", silc_id_render(id, SILC_ID_CLIENT), sock->type == SILC_SOCKET_TYPE_SERVER ? "Server" : "Router", sock->hostname)); /* As a router we keep information of all global information in our global list. Cell wide information however is kept in the local list. The client is put to global list and we will take the hash value of the Client ID and save it to the ID Cache system for fast searching in the future. */ hash = silc_calloc(sizeof(((SilcClientID *)id)->hash), sizeof(unsigned char)); memcpy(hash, ((SilcClientID *)id)->hash, sizeof(((SilcClientID *)id)->hash)); entry = silc_idlist_add_client(id_list, hash, sizeof(((SilcClientID *)id)->hash), NULL, NULL, id, router, NULL); entry->nickname = NULL; entry->data.registered = TRUE; if (sock->type == SILC_SOCKET_TYPE_SERVER) server->stat.cell_clients++; server->stat.clients++; #if 0 /* XXX Adding two ID's with same IP number replaces the old entry thus gives wrong route. Thus, now disabled until figured out a better way to do this or when removed the whole thing. This could be removed because entry->router->connection gives always the most optimal route for the ID anyway (unless new routes (faster perhaps) are established after receiving this ID, this we don't know however). */ /* Add route cache for this ID */ silc_server_route_add(silc_server_route_hash( ((SilcClientID *)id)->ip.s_addr, server->id->port), ((SilcClientID *)id)->ip.s_addr, router); #endif } break; case SILC_ID_SERVER: SILC_LOG_DEBUG(("New server id(%s) from [%s] %s", silc_id_render(id, SILC_ID_SERVER), sock->type == SILC_SOCKET_TYPE_SERVER ? "Server" : "Router", sock->hostname)); /* As a router we keep information of all global information in our global list. Cell wide information however is kept in the local list. */ silc_idlist_add_server(id_list, NULL, 0, id, router, router_sock); if (sock->type == SILC_SOCKET_TYPE_SERVER) server->stat.cell_servers++; server->stat.servers++; #if 0 /* Add route cache for this ID */ silc_server_route_add(silc_server_route_hash( ((SilcServerID *)id)->ip.s_addr, ((SilcServerID *)id)->port), ((SilcServerID *)id)->ip.s_addr, router); #endif break; case SILC_ID_CHANNEL: SILC_LOG_ERROR(("Channel cannot be registered with NEW_ID packet")); break; default: break; } out: silc_id_payload_free(idp); } /* Processes incoming New ID packet. New ID Payload is used to distribute information about newly registered clients and servers. */ void silc_server_new_id(SilcServer server, SilcSocketConnection sock, SilcPacketContext *packet) { silc_server_new_id_real(server, sock, packet, TRUE); } /* Receoved New Id List packet, list of New ID payloads inside one packet. Process the New ID payloads one by one. */ void silc_server_new_id_list(SilcServer server, SilcSocketConnection sock, SilcPacketContext *packet) { SilcPacketContext *new_id; SilcBuffer idp; unsigned short id_len; SILC_LOG_DEBUG(("Processing New ID List")); if (sock->type == SILC_SOCKET_TYPE_CLIENT || packet->src_id_type != SILC_ID_SERVER) return; /* If the sender of this packet is server and we are router we need to broadcast this packet to other routers in the network. Broadcast this list packet instead of multiple New ID packets. */ if (!server->standalone && server->server_type == SILC_ROUTER && sock->type == SILC_SOCKET_TYPE_SERVER && !(packet->flags & SILC_PACKET_FLAG_BROADCAST)) { SILC_LOG_DEBUG(("Broadcasting received New ID List packet")); silc_server_packet_send(server, server->router->connection, packet->type, packet->flags | SILC_PACKET_FLAG_BROADCAST, packet->buffer->data, packet->buffer->len, FALSE); } /* Make copy of the original packet context, except for the actual data buffer, which we will here now fetch from the original buffer. */ new_id = silc_packet_context_alloc(); new_id->type = SILC_PACKET_NEW_ID; new_id->flags = packet->flags; new_id->src_id = packet->src_id; new_id->src_id_len = packet->src_id_len; new_id->src_id_type = packet->src_id_type; new_id->dst_id = packet->dst_id; new_id->dst_id_len = packet->dst_id_len; new_id->dst_id_type = packet->dst_id_type; idp = silc_buffer_alloc(256); new_id->buffer = idp; while (packet->buffer->len) { SILC_GET16_MSB(id_len, packet->buffer->data + 2); if ((id_len > packet->buffer->len) || (id_len > idp->truelen)) break; silc_buffer_pull_tail(idp, 4 + id_len); silc_buffer_put(idp, packet->buffer->data, 4 + id_len); /* Process the New ID */ silc_server_new_id_real(server, sock, new_id, FALSE); silc_buffer_push_tail(idp, 4 + id_len); silc_buffer_pull(packet->buffer, 4 + id_len); } silc_buffer_free(idp); silc_free(new_id); } /* Received New Channel packet. Information about new channels in the network are distributed using this packet. Save the information about the new channel. This usually comes from router but also normal server can send this to notify channels it has when it connects to us. */ void silc_server_new_channel(SilcServer server, SilcSocketConnection sock, SilcPacketContext *packet) { SilcChannelPayload payload; SilcChannelID *channel_id; char *channel_name; unsigned int name_len; unsigned char *id; unsigned int id_len; SILC_LOG_DEBUG(("Processing New Channel")); if (sock->type == SILC_SOCKET_TYPE_CLIENT || packet->src_id_type != SILC_ID_SERVER || server->server_type == SILC_SERVER) return; /* Parse the channel payload */ payload = silc_channel_payload_parse(packet->buffer); if (!payload) return; /* Get the channel ID */ channel_id = silc_channel_get_id_parse(payload); if (!channel_id) { silc_channel_payload_free(payload); return; } channel_name = silc_channel_get_name(payload, &name_len); if (name_len > 256) channel_name[255] = '\0'; id = silc_channel_get_id(payload, &id_len); if (sock->type == SILC_SOCKET_TYPE_ROUTER) { /* Add the server to global list as it is coming from router. It cannot be our own channel as it is coming from router. */ SILC_LOG_DEBUG(("New channel id(%s) from [Router] %s", silc_id_render(channel_id, SILC_ID_CHANNEL), sock->hostname)); silc_idlist_add_channel(server->global_list, strdup(channel_name), 0, channel_id, server->router->connection, NULL, NULL); server->stat.channels++; } else { /* The channel is coming from our server, thus it is in our cell we will add it to our local list. */ SilcChannelEntry channel; SilcBuffer chk; SILC_LOG_DEBUG(("New channel id(%s) from [Server] %s", silc_id_render(channel_id, SILC_ID_CHANNEL), sock->hostname)); /* Check that we don't already have this channel */ channel = silc_idlist_find_channel_by_name(server->local_list, channel_name, NULL); if (!channel) channel = silc_idlist_find_channel_by_name(server->global_list, channel_name, NULL); /* If the channel does not exist, then create it. We create the channel with the channel ID provided by the server. This creates a new key to the channel as well that we will send to the server. */ if (!channel) { channel = silc_server_create_new_channel_with_id(server, NULL, NULL, channel_name, channel_id, FALSE); if (!channel) { silc_channel_payload_free(payload); silc_free(channel_id); return; } /* Send the new channel key to the server */ chk = silc_channel_key_payload_encode(id_len, id, strlen(channel->channel_key-> cipher->name), channel->channel_key->cipher->name, channel->key_len / 8, channel->key); silc_server_packet_send(server, sock, SILC_PACKET_CHANNEL_KEY, 0, chk->data, chk->len, FALSE); silc_buffer_free(chk); } else { /* The channel exist by that name, check whether the ID's match. If they don't then we'll force the server to use the ID we have. We also create a new key for the channel. */ if (SILC_ID_CHANNEL_COMPARE(channel_id, channel->id)) { /* They don't match, send CHANNEL_CHANGE notify to the server to force the ID change. */ SILC_LOG_DEBUG(("Forcing the server to change Channel ID")); silc_server_send_notify_channel_change(server, sock, FALSE, channel_id, channel->id, SILC_ID_CHANNEL_LEN); } /* Create new key for the channel and send it to the server and everybody else possibly on the channel. */ silc_server_create_channel_key(server, channel, 0); /* Send to the channel */ silc_server_send_channel_key(server, sock, channel, FALSE); /* Send to the server */ chk = silc_channel_key_payload_encode(id_len, id, strlen(channel->channel_key-> cipher->name), channel->channel_key->cipher->name, channel->key_len / 8, channel->key); silc_server_packet_send(server, sock, SILC_PACKET_CHANNEL_KEY, 0, chk->data, chk->len, FALSE); silc_buffer_free(chk); silc_free(channel_id); /* Since the channel is coming from server and we also know about it then send the JOIN notify to the server so that it see's our users on the channel "joining" the channel. */ /* XXX TODO **/ } } } /* Received New Channel List packet, list of New Channel List payloads inside one packet. Process the New Channel payloads one by one. */ void silc_server_new_channel_list(SilcServer server, SilcSocketConnection sock, SilcPacketContext *packet) { SilcPacketContext *new; SilcBuffer buffer; unsigned short len1, len2; SILC_LOG_DEBUG(("Processing New Channel List")); if (sock->type == SILC_SOCKET_TYPE_CLIENT || packet->src_id_type != SILC_ID_SERVER || server->server_type == SILC_SERVER) return; /* If the sender of this packet is server and we are router we need to broadcast this packet to other routers in the network. Broadcast this list packet instead of multiple New Channel packets. */ if (!server->standalone && server->server_type == SILC_ROUTER && sock->type == SILC_SOCKET_TYPE_SERVER && !(packet->flags & SILC_PACKET_FLAG_BROADCAST)) { SILC_LOG_DEBUG(("Broadcasting received New Channel List packet")); silc_server_packet_send(server, server->router->connection, packet->type, packet->flags | SILC_PACKET_FLAG_BROADCAST, packet->buffer->data, packet->buffer->len, FALSE); } /* Make copy of the original packet context, except for the actual data buffer, which we will here now fetch from the original buffer. */ new = silc_packet_context_alloc(); new->type = SILC_PACKET_NEW_CHANNEL; new->flags = packet->flags; new->src_id = packet->src_id; new->src_id_len = packet->src_id_len; new->src_id_type = packet->src_id_type; new->dst_id = packet->dst_id; new->dst_id_len = packet->dst_id_len; new->dst_id_type = packet->dst_id_type; buffer = silc_buffer_alloc(512); new->buffer = buffer; while (packet->buffer->len) { SILC_GET16_MSB(len1, packet->buffer->data); if ((len1 > packet->buffer->len) || (len1 > buffer->truelen)) break; SILC_GET16_MSB(len2, packet->buffer->data + 2 + len1); if ((len2 > packet->buffer->len) || (len2 > buffer->truelen)) break; silc_buffer_pull_tail(buffer, 8 + len1 + len2); silc_buffer_put(buffer, packet->buffer->data, 8 + len1 + len2); /* Process the New Channel */ silc_server_new_channel(server, sock, new); silc_buffer_push_tail(buffer, 8 + len1 + len2); silc_buffer_pull(packet->buffer, 8 + len1 + len2); } silc_buffer_free(buffer); silc_free(new); } /* Received key agreement packet. This packet is never for us. It is to the client in the packet's destination ID. Sending of this sort of packet equals sending private message, ie. it is sent point to point from one client to another. */ void silc_server_key_agreement(SilcServer server, SilcSocketConnection sock, SilcPacketContext *packet) { SilcSocketConnection dst_sock; SilcIDListData idata; SILC_LOG_DEBUG(("Start")); if (packet->src_id_type != SILC_ID_CLIENT || packet->dst_id_type != SILC_ID_CLIENT) return; if (!packet->dst_id) return; /* Get the route to the client */ dst_sock = silc_server_get_client_route(server, packet->dst_id, packet->dst_id_len, &idata); if (!dst_sock) return; /* Relay the packet */ silc_server_relay_packet(server, dst_sock, idata->send_key, idata->hmac, packet, FALSE); }