/* command.c Author: Pekka Riikonen Copyright (C) 1997 - 2000 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. */ /* $Id$ */ #include "serverincludes.h" #include "server_internal.h" static int silc_server_is_registered(SilcServer server, SilcSocketConnection sock, SilcServerCommandContext cmd, SilcCommand command); static void silc_server_command_send_status_reply(SilcServerCommandContext cmd, SilcCommand command, SilcCommandStatus status); static void silc_server_command_send_status_data(SilcServerCommandContext cmd, SilcCommand command, SilcCommandStatus status, unsigned int arg_type, unsigned char *arg, unsigned int arg_len); static void silc_server_command_free(SilcServerCommandContext cmd); void silc_server_command_send_names(SilcServer server, SilcSocketConnection sock, SilcChannelEntry channel); /* Server command list. */ SilcServerCommand silc_command_list[] = { SILC_SERVER_CMD(whois, WHOIS, SILC_CF_LAG | SILC_CF_REG), SILC_SERVER_CMD(whowas, WHOWAS, SILC_CF_LAG | SILC_CF_REG), SILC_SERVER_CMD(identify, IDENTIFY, SILC_CF_LAG | SILC_CF_REG), SILC_SERVER_CMD(nick, NICK, SILC_CF_LAG | SILC_CF_REG), SILC_SERVER_CMD(list, LIST, SILC_CF_LAG | SILC_CF_REG), SILC_SERVER_CMD(topic, TOPIC, SILC_CF_LAG | SILC_CF_REG), SILC_SERVER_CMD(invite, INVITE, SILC_CF_LAG | SILC_CF_REG), SILC_SERVER_CMD(quit, QUIT, SILC_CF_LAG | SILC_CF_REG), SILC_SERVER_CMD(kill, KILL, SILC_CF_LAG | SILC_CF_REG | SILC_CF_OPER), SILC_SERVER_CMD(info, INFO, SILC_CF_LAG | SILC_CF_REG), SILC_SERVER_CMD(connect, CONNECT, SILC_CF_LAG | SILC_CF_REG | SILC_CF_OPER), SILC_SERVER_CMD(ping, PING, SILC_CF_LAG | SILC_CF_REG), SILC_SERVER_CMD(oper, OPER, SILC_CF_LAG | SILC_CF_REG | SILC_CF_OPER), SILC_SERVER_CMD(join, JOIN, SILC_CF_LAG | SILC_CF_REG), SILC_SERVER_CMD(motd, MOTD, SILC_CF_LAG | SILC_CF_REG), SILC_SERVER_CMD(umode, UMODE, SILC_CF_LAG | SILC_CF_REG), SILC_SERVER_CMD(cmode, CMODE, SILC_CF_LAG | SILC_CF_REG), SILC_SERVER_CMD(cumode, CUMODE, SILC_CF_LAG | SILC_CF_REG), SILC_SERVER_CMD(kick, KICK, SILC_CF_LAG | SILC_CF_REG), SILC_SERVER_CMD(restart, RESTART, SILC_CF_LAG | SILC_CF_REG | SILC_CF_OPER), SILC_SERVER_CMD(close, CLOSE, SILC_CF_LAG | SILC_CF_REG | SILC_CF_OPER), SILC_SERVER_CMD(die, DIE, SILC_CF_LAG | SILC_CF_REG | SILC_CF_OPER), SILC_SERVER_CMD(silcoper, SILCOPER, SILC_CF_LAG | SILC_CF_REG | SILC_CF_SILC_OPER), SILC_SERVER_CMD(leave, LEAVE, SILC_CF_LAG | SILC_CF_REG), SILC_SERVER_CMD(names, NAMES, SILC_CF_LAG | SILC_CF_REG), { NULL, 0 }, }; #define SILC_SERVER_COMMAND_CHECK_ARGC(command, context, min, max) \ do { \ unsigned int _argc = silc_argument_get_arg_num(cmd->args); \ \ SILC_LOG_DEBUG(("Start")); \ \ if (_argc < min) { \ silc_server_command_send_status_reply(cmd, command, \ SILC_STATUS_ERR_NOT_ENOUGH_PARAMS); \ silc_server_command_free(cmd); \ return; \ } \ if (_argc > max) { \ silc_server_command_send_status_reply(cmd, command, \ SILC_STATUS_ERR_TOO_MANY_PARAMS); \ silc_server_command_free(cmd); \ return; \ } \ } while(0) /* Returns TRUE if the connection is registered. Unregistered connections usually cannot send commands hence the check. */ static int silc_server_is_registered(SilcServer server, SilcSocketConnection sock, SilcServerCommandContext cmd, SilcCommand command) { SilcIDListData idata = (SilcIDListData)sock->user_data; if (idata->registered) return TRUE; silc_server_command_send_status_reply(cmd, command, SILC_STATUS_ERR_NOT_REGISTERED); silc_server_command_free(cmd); return FALSE; } /* Processes received command packet. */ void silc_server_command_process(SilcServer server, SilcSocketConnection sock, SilcPacketContext *packet) { SilcServerCommandContext ctx; SilcServerCommand *cmd; #if 0 /* XXX allow commands in but do not execute them more than once per two seconds. */ /* Check whether it is allowed for this connection to execute any command. */ if (sock->type == SILC_SOCKET_TYPE_CLIENT) { time_t curtime; SilcClientEntry client = (SilcClientEntry)sock->user_data; if (!client) return; /* Allow only one command executed in 2 seconds. */ curtime = time(NULL); if (client->last_command && (curtime - client->last_command) < 2) return; /* Update access time */ client->last_command = curtime; } #endif /* Allocate command context. This must be free'd by the command routine receiving it. */ ctx = silc_calloc(1, sizeof(*ctx)); ctx->server = server; ctx->sock = sock; ctx->packet = silc_packet_context_dup(packet); /* Save original packet */ /* Parse the command payload in the packet */ ctx->payload = silc_command_payload_parse(packet->buffer); if (!ctx->payload) { SILC_LOG_ERROR(("Bad command payload, packet dropped")); silc_buffer_free(packet->buffer); silc_packet_context_free(packet); silc_free(ctx); return; } ctx->args = silc_command_get_args(ctx->payload); /* Execute command. If this fails the packet is dropped. */ for (cmd = silc_command_list; cmd->cb; cmd++) if (cmd->cmd == silc_command_get(ctx->payload)) { if (!(cmd->flags & SILC_CF_REG)) { cmd->cb(ctx); break; } if (silc_server_is_registered(server, sock, ctx, cmd->cmd)) { cmd->cb(ctx); break; } } if (cmd == NULL) { SILC_LOG_ERROR(("Unknown command, packet dropped")); silc_server_command_free(ctx); return; } } /* Add new pending command to be executed when reply to a command has been received. The `reply_cmd' is the command that will call the `callback' with `context' when reply has been received. If `ident' is non-zero the `callback' will be executed when received reply with command identifier `ident'. */ void silc_server_command_pending(SilcServer server, SilcCommand reply_cmd, unsigned short ident, SilcCommandCb callback, void *context) { SilcServerCommandPending *reply; reply = silc_calloc(1, sizeof(*reply)); reply->reply_cmd = reply_cmd; reply->ident = ident; reply->context = context; reply->callback = callback; silc_dlist_add(server->pending_commands, reply); } /* Deletes pending command by reply command type. */ void silc_server_command_pending_del(SilcServer server, SilcCommand reply_cmd, unsigned short ident) { SilcServerCommandPending *r; silc_dlist_start(server->pending_commands); while ((r = silc_dlist_get(server->pending_commands)) != SILC_LIST_END) { if (r->reply_cmd == reply_cmd && r->ident == ident) { silc_dlist_del(server->pending_commands, r); break; } } } /* Checks for pending commands and marks callbacks to be called from the command reply function. Returns TRUE if there were pending command. */ int silc_server_command_pending_check(SilcServer server, SilcServerCommandReplyContext ctx, SilcCommand command, unsigned short ident) { SilcServerCommandPending *r; silc_dlist_start(server->pending_commands); while ((r = silc_dlist_get(server->pending_commands)) != SILC_LIST_END) { if (r->reply_cmd == command && r->ident == ident) { ctx->context = r->context; ctx->callback = r->callback; ctx->ident = ident; return TRUE; } } return FALSE; } /* Free's the command context allocated before executing the command */ static void silc_server_command_free(SilcServerCommandContext cmd) { if (cmd) { if (cmd->payload) silc_command_free_payload(cmd->payload); if (cmd->packet) silc_packet_context_free(cmd->packet); silc_free(cmd); } } /* Sends simple status message as command reply packet */ static void silc_server_command_send_status_reply(SilcServerCommandContext cmd, SilcCommand command, SilcCommandStatus status) { SilcBuffer buffer; SILC_LOG_DEBUG(("Sending command status %d", status)); buffer = silc_command_reply_payload_encode_va(command, status, 0, 0); silc_server_packet_send(cmd->server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0, buffer->data, buffer->len, FALSE); silc_buffer_free(buffer); } /* Sends command status reply with one extra argument. The argument type must be sent as argument. */ static void silc_server_command_send_status_data(SilcServerCommandContext cmd, SilcCommand command, SilcCommandStatus status, unsigned int arg_type, unsigned char *arg, unsigned int arg_len) { SilcBuffer buffer; SILC_LOG_DEBUG(("Sending command status %d", status)); buffer = silc_command_reply_payload_encode_va(command, status, 0, 1, arg_type, arg, arg_len); silc_server_packet_send(cmd->server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0, buffer->data, buffer->len, FALSE); silc_buffer_free(buffer); } /****************************************************************************** WHOIS Functions ******************************************************************************/ static int silc_server_command_whois_parse(SilcServerCommandContext cmd, SilcClientID **client_id, char **nickname, char **server_name, int *count) { unsigned char *tmp; unsigned int len; unsigned int argc = silc_argument_get_arg_num(cmd->args); /* If client ID is in the command it must be used instead of nickname */ tmp = silc_argument_get_arg_type(cmd->args, 2, &len); if (!tmp) { /* No ID, get the nickname@server string and parse it. */ tmp = silc_argument_get_arg_type(cmd->args, 1, NULL); if (tmp) { if (strchr(tmp, '@')) { len = strcspn(tmp, "@"); *nickname = silc_calloc(len + 1, sizeof(char)); memcpy(*nickname, tmp, len); *server_name = silc_calloc(strlen(tmp) - len, sizeof(char)); memcpy(*server_name, tmp + len + 1, strlen(tmp) - len - 1); } else { *nickname = strdup(tmp); } } else { silc_server_command_send_status_reply(cmd, SILC_COMMAND_WHOIS, SILC_STATUS_ERR_NOT_ENOUGH_PARAMS); return FALSE; } } else { /* Command includes ID, use that */ *client_id = silc_id_payload_parse_id(tmp, len); } /* Get the max count of reply messages allowed */ if (argc == 3) { tmp = silc_argument_get_arg_type(cmd->args, 3, NULL); if (!tmp) { silc_server_command_send_status_reply(cmd, SILC_COMMAND_WHOIS, SILC_STATUS_ERR_TOO_MANY_PARAMS); if (*nickname) silc_free(*nickname); if (*server_name) silc_free(*server_name); return FALSE; } *count = atoi(tmp); } return TRUE; } static char silc_server_command_whois_check(SilcServerCommandContext cmd, SilcClientEntry *clients, unsigned int clients_count) { SilcServer server = cmd->server; int i; SilcClientEntry entry; for (i = 0; i < clients_count; i++) { entry = clients[i]; if (!entry->nickname || !entry->username || !entry->userinfo) { SilcBuffer tmpbuf; unsigned short old_ident; old_ident = silc_command_get_ident(cmd->payload); silc_command_set_ident(cmd->payload, silc_rng_get_rn16(server->rng)); tmpbuf = silc_command_payload_encode_payload(cmd->payload); /* Send WHOIS command */ silc_server_packet_send(server, entry->router->connection, SILC_PACKET_COMMAND, cmd->packet->flags, tmpbuf->data, tmpbuf->len, TRUE); /* Reprocess this packet after received reply */ silc_server_command_pending(server, SILC_COMMAND_WHOIS, silc_command_get_ident(cmd->payload), silc_server_command_whois, (void *)cmd); cmd->pending = TRUE; silc_command_set_ident(cmd->payload, old_ident); silc_buffer_free(tmpbuf); return FALSE; } } return TRUE; } static void silc_server_command_whois_send_reply(SilcServerCommandContext cmd, SilcClientEntry *clients, unsigned int clients_count) { SilcServer server = cmd->server; char *tmp; int i, count = 0, len; SilcBuffer packet, idp; SilcClientEntry entry; SilcCommandStatus status; unsigned short ident = silc_command_get_ident(cmd->payload); status = SILC_STATUS_OK; if (clients_count > 1) status = SILC_STATUS_LIST_START; for (i = 0; i < clients_count; i++) { entry = clients[i]; if (count && i - 1 == count) break; if (clients_count > 2) status = SILC_STATUS_LIST_ITEM; if (clients_count > 1 && i == clients_count - 1) status = SILC_STATUS_LIST_END; /* Send WHOIS reply */ idp = silc_id_payload_encode(entry->id, SILC_ID_CLIENT); tmp = silc_argument_get_first_arg(cmd->args, NULL); /* XXX */ { char nh[256], uh[256]; unsigned char idle[4]; SilcSocketConnection hsock; memset(uh, 0, sizeof(uh)); memset(nh, 0, sizeof(nh)); strncat(nh, entry->nickname, strlen(entry->nickname)); if (!strchr(entry->nickname, '@')) { strncat(nh, "@", 1); len = entry->router ? strlen(entry->router->server_name) : strlen(server->server_name); strncat(nh, entry->router ? entry->router->server_name : server->server_name, len); } strncat(uh, entry->username, strlen(entry->username)); if (!strchr(entry->username, '@')) { strncat(uh, "@", 1); hsock = (SilcSocketConnection)entry->connection; len = strlen(hsock->hostname); strncat(uh, hsock->hostname, len); } SILC_PUT32_MSB((time(NULL) - entry->data.last_receive), idle); /* XXX */ if (entry->userinfo) packet = silc_command_reply_payload_encode_va(SILC_COMMAND_WHOIS, status, ident, 5, 2, idp->data, idp->len, 3, nh, strlen(nh), 4, uh, strlen(uh), 5, entry->userinfo, strlen(entry->userinfo), 7, idle, 4); else packet = silc_command_reply_payload_encode_va(SILC_COMMAND_WHOIS, status, ident, 4, 2, idp->data, idp->len, 3, nh, strlen(nh), 4, uh, strlen(uh), 7, idle, 4); } silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0, packet->data, packet->len, FALSE); silc_buffer_free(packet); silc_buffer_free(idp); } } static int silc_server_command_whois_from_client(SilcServerCommandContext cmd) { SilcServer server = cmd->server; char *nick = NULL, *server_name = NULL; int count = 0, clients_count; SilcClientID *client_id = NULL; SilcClientEntry *clients = NULL, entry; int ret = 0; /* Parse the whois request */ if (!silc_server_command_whois_parse(cmd, &client_id, &nick, &server_name, &count)) return 0; /* Protocol dictates that we must always send the received WHOIS request to our router if we are normal server, so let's do it now unless we are standalone. We will not send any replies to the client until we have received reply from the router. */ if (server->server_type == SILC_SERVER && !cmd->pending && !server->standalone) { SilcBuffer tmpbuf; unsigned short old_ident; old_ident = silc_command_get_ident(cmd->payload); silc_command_set_ident(cmd->payload, silc_rng_get_rn16(server->rng)); tmpbuf = silc_command_payload_encode_payload(cmd->payload); /* Send WHOIS command to our router */ silc_server_packet_send(server, (SilcSocketConnection) server->router->connection, SILC_PACKET_COMMAND, cmd->packet->flags, tmpbuf->data, tmpbuf->len, TRUE); /* Reprocess this packet after received reply from router */ silc_server_command_pending(server, SILC_COMMAND_WHOIS, silc_command_get_ident(cmd->payload), silc_server_command_whois, (void *)cmd); cmd->pending = TRUE; silc_command_set_ident(cmd->payload, old_ident); silc_buffer_free(tmpbuf); ret = -1; goto out; } /* We are ready to process the command request. Let's search for the requested client and send reply to the requesting client. */ /* Get all clients matching that ID or nickname from local list */ if (client_id) { entry = silc_idlist_find_client_by_id(server->local_list, client_id, NULL); if (entry) { clients = silc_calloc(1, sizeof(*clients)); clients[0] = entry; clients_count = 1; } } else { clients = silc_idlist_get_clients_by_nickname(server->local_list, nick, server_name, &clients_count); } /* Check global list as well */ if (!clients) { if (client_id) { entry = silc_idlist_find_client_by_id(server->global_list, client_id, NULL); if (entry) { clients = silc_calloc(1, sizeof(*clients)); clients[0] = entry; clients_count = 1; } } else { clients = silc_idlist_get_clients_by_nickname(server->global_list, nick, server_name, &clients_count); } } if (!clients) { /* Such a client really does not exist in the SILC network. */ silc_server_command_send_status_data(cmd, SILC_COMMAND_WHOIS, SILC_STATUS_ERR_NO_SUCH_NICK, 3, nick, strlen(nick)); goto out; } /* Router always finds the client entry if it exists in the SILC network. However, it might be incomplete entry and does not include all the mandatory fields that WHOIS command reply requires. Check for these and make query from the server who owns the client if some fields are missing. */ if (server->server_type == SILC_ROUTER && !silc_server_command_whois_check(cmd, clients, clients_count)) { ret = -1; goto out; } /* Send the command reply to the client */ silc_server_command_whois_send_reply(cmd, clients, clients_count); out: if (clients) silc_free(clients); if (client_id) silc_free(client_id); if (nick) silc_free(nick); if (server_name) silc_free(server_name); return ret; } static int silc_server_command_whois_from_server(SilcServerCommandContext cmd) { SilcServer server = cmd->server; char *nick = NULL, *server_name = NULL; int count = 0, clients_count; SilcClientID *client_id = NULL; SilcClientEntry *clients = NULL, entry; int ret = 0; /* Parse the whois request */ if (!silc_server_command_whois_parse(cmd, &client_id, &nick, &server_name, &count)) return 0; /* Process the command request. Let's search for the requested client and send reply to the requesting server. */ if (client_id) { entry = silc_idlist_find_client_by_id(server->local_list, client_id, NULL); if (entry) { clients = silc_calloc(1, sizeof(*clients)); clients[0] = entry; clients_count = 1; } } else { clients = silc_idlist_get_clients_by_nickname(server->local_list, nick, server_name, &clients_count); if (!clients) clients = silc_idlist_get_clients_by_hash(server->local_list, nick, server->md5hash, &clients_count); } /* If we are router we will check our global list as well. */ if (!clients && server->server_type == SILC_ROUTER) { if (client_id) { entry = silc_idlist_find_client_by_id(server->global_list, client_id, NULL); if (entry) { clients = silc_calloc(1, sizeof(*clients)); clients[0] = entry; clients_count = 1; } } else { clients = silc_idlist_get_clients_by_nickname(server->global_list, nick, server_name, &clients_count); if (!clients) clients = silc_idlist_get_clients_by_hash(server->global_list, nick, server->md5hash, &clients_count); } } if (!clients) { /* Such a client really does not exist in the SILC network. */ silc_server_command_send_status_data(cmd, SILC_COMMAND_WHOIS, SILC_STATUS_ERR_NO_SUCH_NICK, 3, nick, strlen(nick)); goto out; } /* Router always finds the client entry if it exists in the SILC network. However, it might be incomplete entry and does not include all the mandatory fields that WHOIS command reply requires. Check for these and make query from the server who owns the client if some fields are missing. */ if (!cmd->pending && server->server_type == SILC_ROUTER && !silc_server_command_whois_check(cmd, clients, clients_count)) { ret = -1; goto out; } /* Send the command reply to the client */ silc_server_command_whois_send_reply(cmd, clients, clients_count); out: if (clients) silc_free(clients); if (client_id) silc_free(client_id); if (nick) silc_free(nick); if (server_name) silc_free(server_name); return ret; } /* Server side of command WHOIS. Processes user's query and sends found results as command replies back to the client. */ SILC_SERVER_CMD_FUNC(whois) { SilcServerCommandContext cmd = (SilcServerCommandContext)context; int ret; SILC_SERVER_COMMAND_CHECK_ARGC(SILC_COMMAND_WHOIS, cmd, 1, 3); if (cmd->sock->type == SILC_SOCKET_TYPE_CLIENT) ret = silc_server_command_whois_from_client(cmd); else ret = silc_server_command_whois_from_server(cmd); if (!ret) silc_server_command_free(cmd); } SILC_SERVER_CMD_FUNC(whowas) { } /****************************************************************************** IDENTIFY Functions ******************************************************************************/ static int silc_server_command_identify_parse(SilcServerCommandContext cmd, SilcClientID **client_id, char **nickname, char **server_name, int *count) { unsigned char *tmp; unsigned int len; unsigned int argc = silc_argument_get_arg_num(cmd->args); /* If client ID is in the command it must be used instead of nickname */ tmp = silc_argument_get_arg_type(cmd->args, 2, &len); if (!tmp) { /* No ID, get the nickname@server string and parse it. */ tmp = silc_argument_get_arg_type(cmd->args, 1, NULL); if (tmp) { if (strchr(tmp, '@')) { len = strcspn(tmp, "@"); *nickname = silc_calloc(len + 1, sizeof(char)); memcpy(*nickname, tmp, len); *server_name = silc_calloc(strlen(tmp) - len, sizeof(char)); memcpy(*server_name, tmp + len + 1, strlen(tmp) - len - 1); } else { *nickname = strdup(tmp); } } else { silc_server_command_send_status_reply(cmd, SILC_COMMAND_IDENTIFY, SILC_STATUS_ERR_NOT_ENOUGH_PARAMS); return FALSE; } } else { /* Command includes ID, use that */ *client_id = silc_id_payload_parse_id(tmp, len); } /* Get the max count of reply messages allowed */ if (argc == 3) { tmp = silc_argument_get_arg_type(cmd->args, 3, NULL); if (!tmp) { silc_server_command_send_status_reply(cmd, SILC_COMMAND_IDENTIFY, SILC_STATUS_ERR_TOO_MANY_PARAMS); if (*nickname) silc_free(*nickname); if (*server_name) silc_free(*server_name); return FALSE; } *count = atoi(tmp); } return TRUE; } static void silc_server_command_identify_send_reply(SilcServerCommandContext cmd, SilcClientEntry *clients, unsigned int clients_count) { SilcServer server = cmd->server; char *tmp; int i, count = 0, len; SilcBuffer packet, idp; SilcClientEntry entry; SilcCommandStatus status; unsigned short ident = silc_command_get_ident(cmd->payload); status = SILC_STATUS_OK; if (clients_count > 1) status = SILC_STATUS_LIST_START; for (i = 0; i < clients_count; i++) { entry = clients[i]; if (count && i - 1 == count) break; if (clients_count > 2) status = SILC_STATUS_LIST_ITEM; if (clients_count > 1 && i == clients_count - 1) status = SILC_STATUS_LIST_END; /* Send IDENTIFY reply */ idp = silc_id_payload_encode(entry->id, SILC_ID_CLIENT); tmp = silc_argument_get_first_arg(cmd->args, NULL); /* XXX */ { char nh[256], uh[256]; SilcSocketConnection hsock; memset(uh, 0, sizeof(uh)); memset(nh, 0, sizeof(nh)); strncat(nh, entry->nickname, strlen(entry->nickname)); if (!strchr(entry->nickname, '@')) { strncat(nh, "@", 1); len = entry->router ? strlen(entry->router->server_name) : strlen(server->server_name); strncat(nh, entry->router ? entry->router->server_name : server->server_name, len); } if (!entry->username) { packet = silc_command_reply_payload_encode_va(SILC_COMMAND_IDENTIFY, SILC_STATUS_OK, ident, 2, 2, idp->data, idp->len, 3, nh, strlen(nh)); } else { strncat(uh, entry->username, strlen(entry->username)); if (!strchr(entry->username, '@')) { strncat(uh, "@", 1); hsock = (SilcSocketConnection)entry->connection; len = strlen(hsock->hostname); strncat(uh, hsock->hostname, len); } packet = silc_command_reply_payload_encode_va(SILC_COMMAND_IDENTIFY, SILC_STATUS_OK, ident, 3, 2, idp->data, idp->len, 3, nh, strlen(nh), 4, uh, strlen(uh)); } silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0, packet->data, packet->len, FALSE); silc_buffer_free(packet); silc_buffer_free(idp); } } } static int silc_server_command_identify_from_client(SilcServerCommandContext cmd) { SilcServer server = cmd->server; char *nick = NULL, *server_name = NULL; int count = 0, clients_count; SilcClientID *client_id = NULL; SilcClientEntry *clients = NULL, entry; int ret = 0; /* Parse the IDENTIFY request */ if (!silc_server_command_identify_parse(cmd, &client_id, &nick, &server_name, &count)) return 0; /* Protocol dictates that we must always send the received IDENTIFY request to our router if we are normal server, so let's do it now unless we are standalone. We will not send any replies to the client until we have received reply from the router. */ if (server->server_type == SILC_SERVER && !cmd->pending && !server->standalone) { SilcBuffer tmpbuf; unsigned short old_ident; old_ident = silc_command_get_ident(cmd->payload); silc_command_set_ident(cmd->payload, silc_rng_get_rn16(server->rng)); tmpbuf = silc_command_payload_encode_payload(cmd->payload); /* Send IDENTIFY command to our router */ silc_server_packet_send(server, (SilcSocketConnection) server->router->connection, SILC_PACKET_COMMAND, cmd->packet->flags, tmpbuf->data, tmpbuf->len, TRUE); /* Reprocess this packet after received reply from router */ silc_server_command_pending(server, SILC_COMMAND_IDENTIFY, silc_command_get_ident(cmd->payload), silc_server_command_identify, (void *)cmd); cmd->pending = TRUE; silc_command_set_ident(cmd->payload, old_ident); silc_buffer_free(tmpbuf); ret = -1; goto out; } /* We are ready to process the command request. Let's search for the requested client and send reply to the requesting client. */ /* Get all clients matching that ID or nickname from local list */ if (client_id) { entry = silc_idlist_find_client_by_id(server->local_list, client_id, NULL); if (entry) { clients = silc_calloc(1, sizeof(*clients)); clients[0] = entry; clients_count = 1; } } else { clients = silc_idlist_get_clients_by_nickname(server->local_list, nick, server_name, &clients_count); } /* Check global list as well */ if (!clients) { if (client_id) { entry = silc_idlist_find_client_by_id(server->global_list, client_id, NULL); if (entry) { clients = silc_calloc(1, sizeof(*clients)); clients[0] = entry; clients_count = 1; } } else { clients = silc_idlist_get_clients_by_nickname(server->global_list, nick, server_name, &clients_count); } } if (!clients) { /* Such a client really does not exist in the SILC network. */ silc_server_command_send_status_data(cmd, SILC_COMMAND_IDENTIFY, SILC_STATUS_ERR_NO_SUCH_NICK, 3, nick, strlen(nick)); goto out; } /* Send the command reply to the client */ silc_server_command_identify_send_reply(cmd, clients, clients_count); out: if (clients) silc_free(clients); if (client_id) silc_free(client_id); if (nick) silc_free(nick); if (server_name) silc_free(server_name); return ret; } static int silc_server_command_identify_from_server(SilcServerCommandContext cmd) { SilcServer server = cmd->server; char *nick = NULL, *server_name = NULL; int count = 0, clients_count; SilcClientID *client_id = NULL; SilcClientEntry *clients = NULL, entry; int ret = 0; /* Parse the IDENTIFY request */ if (!silc_server_command_identify_parse(cmd, &client_id, &nick, &server_name, &count)) return 0; /* Process the command request. Let's search for the requested client and send reply to the requesting server. */ if (client_id) { entry = silc_idlist_find_client_by_id(server->local_list, client_id, NULL); if (entry) { clients = silc_calloc(1, sizeof(*clients)); clients[0] = entry; clients_count = 1; } } else { clients = silc_idlist_get_clients_by_nickname(server->local_list, nick, server_name, &clients_count); if (!clients) clients = silc_idlist_get_clients_by_hash(server->local_list, nick, server->md5hash, &clients_count); } /* If we are router we will check our global list as well. */ if (!clients && server->server_type == SILC_ROUTER) { if (client_id) { entry = silc_idlist_find_client_by_id(server->global_list, client_id, NULL); if (entry) { clients = silc_calloc(1, sizeof(*clients)); clients[0] = entry; clients_count = 1; } } else { clients = silc_idlist_get_clients_by_nickname(server->global_list, nick, server_name, &clients_count); if (!clients) clients = silc_idlist_get_clients_by_hash(server->global_list, nick, server->md5hash, &clients_count); } } if (!clients) { /* Such a client really does not exist in the SILC network. */ silc_server_command_send_status_data(cmd, SILC_COMMAND_IDENTIFY, SILC_STATUS_ERR_NO_SUCH_NICK, 3, nick, strlen(nick)); goto out; } /* Send the command reply to the client */ silc_server_command_identify_send_reply(cmd, clients, clients_count); out: if (clients) silc_free(clients); if (client_id) silc_free(client_id); if (nick) silc_free(nick); if (server_name) silc_free(server_name); return ret; } SILC_SERVER_CMD_FUNC(identify) { SilcServerCommandContext cmd = (SilcServerCommandContext)context; int ret; SILC_SERVER_COMMAND_CHECK_ARGC(SILC_COMMAND_IDENTIFY, cmd, 1, 3); if (cmd->sock->type == SILC_SOCKET_TYPE_CLIENT) ret = silc_server_command_identify_from_client(cmd); else ret = silc_server_command_identify_from_server(cmd); if (!ret) silc_server_command_free(cmd); } /* Checks string for bad characters and returns TRUE if they are found. */ static int silc_server_command_bad_chars(char *nick) { if (strchr(nick, '\\')) return TRUE; if (strchr(nick, '\"')) return TRUE; if (strchr(nick, '´')) return TRUE; if (strchr(nick, '`')) return TRUE; if (strchr(nick, '\'')) return TRUE; if (strchr(nick, '*')) return TRUE; if (strchr(nick, '/')) return TRUE; if (strchr(nick, '@')) return TRUE; return FALSE; } /* Server side of command NICK. Sets nickname for user. Setting nickname causes generation of a new client ID for the client. The new client ID is sent to the client after changing the nickname. */ SILC_SERVER_CMD_FUNC(nick) { SilcServerCommandContext cmd = (SilcServerCommandContext)context; SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data; SilcServer server = cmd->server; SilcBuffer packet, nidp, oidp; SilcClientID *new_id; char *nick; SILC_SERVER_COMMAND_CHECK_ARGC(SILC_COMMAND_NICK, cmd, 1, 1); /* Check nickname */ nick = silc_argument_get_arg_type(cmd->args, 1, NULL); if (silc_server_command_bad_chars(nick) == TRUE) { silc_server_command_send_status_reply(cmd, SILC_COMMAND_NICK, SILC_STATUS_ERR_BAD_NICKNAME); goto out; } /* Create new Client ID */ silc_id_create_client_id(cmd->server->id, cmd->server->rng, cmd->server->md5hash, nick, &new_id); /* Send notify about nickname change to our router. We send the new ID and ask to replace it with the old one. If we are router the packet is broadcasted. */ if (!cmd->server->standalone) silc_server_send_replace_id(server, server->router->connection, server->server_type == SILC_SERVER ? FALSE : TRUE, client->id, SILC_ID_CLIENT, SILC_ID_CLIENT_LEN, new_id, SILC_ID_CLIENT, SILC_ID_CLIENT_LEN); /* Remove old cache entry */ silc_idcache_del_by_id(server->local_list->clients, SILC_ID_CLIENT, client->id); oidp = silc_id_payload_encode(client->id, SILC_ID_CLIENT); /* Free old ID */ if (client->id) { memset(client->id, 0, SILC_ID_CLIENT_LEN); silc_free(client->id); } /* Save the nickname as this client is our local client */ if (client->nickname) silc_free(client->nickname); client->nickname = strdup(nick); client->id = new_id; /* Update client cache */ silc_idcache_add(server->local_list->clients, client->nickname, SILC_ID_CLIENT, client->id, (void *)client, TRUE); nidp = silc_id_payload_encode(client->id, SILC_ID_CLIENT); /* Send NICK_CHANGE notify */ silc_server_send_notify_on_channels(server, client, SILC_NOTIFY_TYPE_NICK_CHANGE, 2, oidp->data, oidp->len, nidp->data, nidp->len); /* Send the new Client ID as reply command back to client */ packet = silc_command_reply_payload_encode_va(SILC_COMMAND_NICK, SILC_STATUS_OK, 0, 1, 2, nidp->data, nidp->len); silc_server_packet_send(cmd->server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0, packet->data, packet->len, FALSE); silc_buffer_free(packet); silc_buffer_free(nidp); silc_buffer_free(oidp); out: silc_server_command_free(cmd); } SILC_SERVER_CMD_FUNC(list) { } /* Server side of TOPIC command. Sets topic for channel and/or returns current topic to client. */ SILC_SERVER_CMD_FUNC(topic) { SilcServerCommandContext cmd = (SilcServerCommandContext)context; SilcServer server = cmd->server; SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data; SilcChannelID *channel_id; SilcChannelEntry channel; SilcChannelClientEntry chl; SilcBuffer packet, idp; unsigned char *tmp; unsigned int argc, tmp_len; SILC_SERVER_COMMAND_CHECK_ARGC(SILC_COMMAND_TOPIC, cmd, 1, 2); argc = silc_argument_get_arg_num(cmd->args); /* Get Channel ID */ tmp = silc_argument_get_arg_type(cmd->args, 1, &tmp_len); if (!tmp) { silc_server_command_send_status_reply(cmd, SILC_COMMAND_TOPIC, SILC_STATUS_ERR_NO_CHANNEL_ID); goto out; } channel_id = silc_id_payload_parse_id(tmp, tmp_len); /* Check whether the channel exists */ channel = silc_idlist_find_channel_by_id(server->local_list, channel_id, NULL); if (!channel) { silc_server_command_send_status_reply(cmd, SILC_COMMAND_TOPIC, SILC_STATUS_ERR_NO_SUCH_CHANNEL); goto out; } if (argc > 1) { /* Get the topic */ tmp = silc_argument_get_arg_type(cmd->args, 2, NULL); if (!tmp) { silc_server_command_send_status_reply(cmd, SILC_COMMAND_TOPIC, SILC_STATUS_ERR_NOT_ENOUGH_PARAMS); goto out; } if (strlen(tmp) > 256) { silc_server_command_send_status_reply(cmd, SILC_COMMAND_TOPIC, SILC_STATUS_ERR_NOT_ENOUGH_PARAMS); goto out; } /* See whether has rights to change topic */ silc_list_start(channel->user_list); while ((chl = silc_list_get(channel->user_list)) != SILC_LIST_END) { if (chl->client == client) { if (chl->mode == SILC_CHANNEL_UMODE_NONE) { silc_server_command_send_status_reply(cmd, SILC_COMMAND_TOPIC, SILC_STATUS_ERR_NO_CHANNEL_PRIV); goto out; } else { break; } } } /* Set the topic for channel */ if (channel->topic) silc_free(channel->topic); channel->topic = strdup(tmp); idp = silc_id_payload_encode(client->id, SILC_ID_CLIENT); /* Send notify about topic change to all clients on the channel */ silc_server_send_notify_to_channel(server, channel, TRUE, SILC_NOTIFY_TYPE_TOPIC_SET, 2, idp->data, idp->len, channel->topic, strlen(channel->topic)); silc_buffer_free(idp); } /* Send the topic to client as reply packet */ idp = silc_id_payload_encode(channel_id, SILC_ID_CHANNEL); if (channel->topic) packet = silc_command_reply_payload_encode_va(SILC_COMMAND_TOPIC, SILC_STATUS_OK, 0, 2, 2, idp->data, idp->len, 3, channel->topic, strlen(channel->topic)); else packet = silc_command_reply_payload_encode_va(SILC_COMMAND_TOPIC, SILC_STATUS_OK, 0, 1, 2, idp->data, idp->len); silc_server_packet_send(cmd->server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0, packet->data, packet->len, FALSE); silc_buffer_free(packet); silc_buffer_free(idp); silc_free(channel_id); out: silc_server_command_free(cmd); } /* Server side of INVITE command. Invites some client to join some channel. */ SILC_SERVER_CMD_FUNC(invite) { SilcServerCommandContext cmd = (SilcServerCommandContext)context; SilcServer server = cmd->server; SilcSocketConnection sock = cmd->sock, dest_sock; SilcClientEntry sender, dest; SilcClientID *dest_id; SilcChannelEntry channel; SilcChannelID *channel_id; SilcBuffer sidp; unsigned char *tmp; unsigned int len; SILC_SERVER_COMMAND_CHECK_ARGC(SILC_COMMAND_INVITE, cmd, 1, 2); /* Get destination ID */ tmp = silc_argument_get_arg_type(cmd->args, 1, &len); if (!tmp) { silc_server_command_send_status_reply(cmd, SILC_COMMAND_INVITE, SILC_STATUS_ERR_NO_CLIENT_ID); goto out; } dest_id = silc_id_payload_parse_id(tmp, len); /* Get Channel ID */ tmp = silc_argument_get_arg_type(cmd->args, 2, &len); if (!tmp) { silc_server_command_send_status_reply(cmd, SILC_COMMAND_INVITE, SILC_STATUS_ERR_NO_CHANNEL_ID); goto out; } channel_id = silc_id_payload_parse_id(tmp, len); /* Check whether the channel exists */ channel = silc_idlist_find_channel_by_id(server->local_list, channel_id, NULL); if (!channel) { silc_server_command_send_status_reply(cmd, SILC_COMMAND_INVITE, SILC_STATUS_ERR_NO_SUCH_CHANNEL); goto out; } /* Check whether the sender of this command is on the channel. */ sender = (SilcClientEntry)sock->user_data; if (!silc_server_client_on_channel(sender, channel)) { silc_server_command_send_status_reply(cmd, SILC_COMMAND_INVITE, SILC_STATUS_ERR_NOT_ON_CHANNEL); goto out; } /* Check whether the channel is invite-only channel. If yes then the sender of this command must be at least channel operator. */ if (channel->mode & SILC_CHANNEL_MODE_INVITE) { SilcChannelClientEntry chl; silc_list_start(channel->user_list); while ((chl = silc_list_get(channel->user_list)) != SILC_LIST_END) if (chl->client == sender) { if (chl->mode == SILC_CHANNEL_UMODE_NONE) { silc_server_command_send_status_reply(cmd, SILC_COMMAND_INVITE, SILC_STATUS_ERR_NO_CHANNEL_PRIV); goto out; } break; } } /* Find the connection data for the destination. If it is local we will send it directly otherwise we will send it to router for routing. */ dest = silc_idlist_find_client_by_id(server->local_list, dest_id, NULL); if (dest) dest_sock = (SilcSocketConnection)dest->connection; else dest_sock = silc_server_route_get(server, dest_id, SILC_ID_CLIENT); /* Check whether the requested client is already on the channel. */ /* XXX if we are normal server we don't know about global clients on the channel thus we must request it (NAMES command), check from local cache as well. */ if (silc_server_client_on_channel(dest, channel)) { silc_server_command_send_status_reply(cmd, SILC_COMMAND_INVITE, SILC_STATUS_ERR_USER_ON_CHANNEL); goto out; } sidp = silc_id_payload_encode(sender->id, SILC_ID_CLIENT); /* Send notify to the client that is invited to the channel */ silc_server_send_notify_dest(server, dest_sock, dest_id, SILC_ID_CLIENT, SILC_NOTIFY_TYPE_INVITE, 2, sidp->data, sidp->len, tmp, len); /* Send command reply */ silc_server_command_send_status_reply(cmd, SILC_COMMAND_INVITE, SILC_STATUS_OK); silc_buffer_free(sidp); out: silc_server_command_free(cmd); } /* Quits connection to client. This gets called if client won't close the connection even when it has issued QUIT command. */ SILC_TASK_CALLBACK(silc_server_command_quit_cb) { SilcServer server = (SilcServer)context; SilcSocketConnection sock = server->sockets[fd]; /* Free all client specific data, such as client entry and entires on channels this client may be on. */ silc_server_free_sock_user_data(server, sock); /* Close the connection on our side */ silc_server_close_connection(server, sock); } /* Quits SILC session. This is the normal way to disconnect client. */ SILC_SERVER_CMD_FUNC(quit) { SilcServerCommandContext cmd = (SilcServerCommandContext)context; SilcServer server = cmd->server; SilcSocketConnection sock = cmd->sock; SILC_LOG_DEBUG(("Start")); /* We quit the connection with little timeout */ silc_task_register(server->timeout_queue, sock->sock, silc_server_command_quit_cb, server, 0, 300000, SILC_TASK_TIMEOUT, SILC_TASK_PRI_LOW); silc_server_command_free(cmd); } SILC_SERVER_CMD_FUNC(kill) { } /* Server side of command INFO. This sends information about us to the client. If client requested specific server we will send the command to that server. */ SILC_SERVER_CMD_FUNC(info) { SilcServerCommandContext cmd = (SilcServerCommandContext)context; SilcServer server = cmd->server; SilcBuffer packet, idp; unsigned int argc; char info_string[256], *dest_server; SILC_SERVER_COMMAND_CHECK_ARGC(SILC_COMMAND_INFO, cmd, 1, 1); /* Get server name */ dest_server = silc_argument_get_arg_type(cmd->args, 1, NULL); if (!dest_server) { silc_server_command_send_status_reply(cmd, SILC_COMMAND_INFO, SILC_STATUS_ERR_NO_SUCH_SERVER); goto out; } if (!strncasecmp(dest_server, server->server_name, strlen(dest_server))) { /* Send our reply */ memset(info_string, 0, sizeof(info_string)); snprintf(info_string, sizeof(info_string), "location: %s server: %s admin: %s <%s>", server->config->admin_info->location, server->config->admin_info->server_type, server->config->admin_info->admin_name, server->config->admin_info->admin_email); idp = silc_id_payload_encode(server->id, SILC_ID_SERVER); packet = silc_command_reply_payload_encode_va(SILC_COMMAND_INFO, SILC_STATUS_OK, 0, 2, 2, idp->data, idp->len, 3, info_string, strlen(info_string)); silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0, packet->data, packet->len, FALSE); silc_buffer_free(packet); silc_buffer_free(idp); } else { /* Send this command to the requested server */ if (server->server_type == SILC_SERVER && !server->standalone) { } if (server->server_type == SILC_ROUTER) { } } out: silc_server_command_free(cmd); } SILC_SERVER_CMD_FUNC(connect) { } /* Server side of command PING. This just replies to the ping. */ SILC_SERVER_CMD_FUNC(ping) { SilcServerCommandContext cmd = (SilcServerCommandContext)context; SilcServer server = cmd->server; SilcServerID *id; unsigned int len; unsigned char *tmp; SILC_SERVER_COMMAND_CHECK_ARGC(SILC_COMMAND_INFO, cmd, 1, 2); /* Get Server ID */ tmp = silc_argument_get_arg_type(cmd->args, 1, &len); if (!tmp) { silc_server_command_send_status_reply(cmd, SILC_COMMAND_PING, SILC_STATUS_ERR_NO_SERVER_ID); goto out; } id = silc_id_str2id(tmp, SILC_ID_SERVER); if (!id) goto out; if (!SILC_ID_SERVER_COMPARE(id, server->id)) { /* Send our reply */ silc_server_command_send_status_reply(cmd, SILC_COMMAND_PING, SILC_STATUS_OK); } else { silc_server_command_send_status_reply(cmd, SILC_COMMAND_PING, SILC_STATUS_ERR_NO_SUCH_SERVER); goto out; } silc_free(id); out: silc_server_command_free(cmd); } SILC_SERVER_CMD_FUNC(oper) { } typedef struct { char *channel_name; char *nickname; char *username; char *hostname; SilcChannelEntry channel; SilcServer server; SilcClientEntry client; } JoinInternalContext; SILC_TASK_CALLBACK(silc_server_command_join_notify) { JoinInternalContext *ctx = (JoinInternalContext *)context; if (ctx->channel->key && ctx->channel->key_len) { SilcBuffer clidp; clidp = silc_id_payload_encode(ctx->client->id, SILC_ID_CLIENT); silc_server_send_notify_to_channel(ctx->server, ctx->channel, FALSE, SILC_NOTIFY_TYPE_JOIN, 1, clidp->data, clidp->len); #if 0 /* Send NEW_CHANNEL_USER packet to primary route */ silc_server_send_new_channel_user(server, server->router->connection, server->server_type == SILC_SERVER ? FALSE : TRUE, channel->id, SILC_ID_CHANNEL_LEN, client->id, SILC_ID_CLIENT_LEN); #endif /* Send NAMES command reply to the joined channel so the user sees who is currently on the channel. */ silc_server_command_send_names(ctx->server, ctx->client->connection, ctx->channel); silc_buffer_free(clidp); silc_free(ctx); } else { silc_task_register(ctx->server->timeout_queue, fd, silc_server_command_join_notify, context, 0, 200000, SILC_TASK_TIMEOUT, SILC_TASK_PRI_LOW); } } /* Assembles NAMES command and executes it. This is called when client joins to a channel and we wan't to send NAMES command reply to the client. */ void silc_server_command_send_names(SilcServer server, SilcSocketConnection sock, SilcChannelEntry channel) { SilcServerCommandContext cmd; SilcBuffer buffer, idp; idp = silc_id_payload_encode(channel->id, SILC_ID_CHANNEL); buffer = silc_command_payload_encode_va(SILC_COMMAND_NAMES, 0, 1, 1, idp->data, idp->len); cmd = silc_calloc(1, sizeof(*cmd)); cmd->payload = silc_command_payload_parse(buffer); cmd->args = silc_command_get_args(cmd->payload); cmd->server = server; cmd->sock = sock; cmd->pending = FALSE; silc_server_command_names((void *)cmd); silc_free(buffer); silc_free(idp); } /* Internal routine that is called after router has replied to server's JOIN command it forwarded to the router. The route has joined and possibly creaetd the channel. This function adds the client to the channel's user list. */ SILC_SERVER_CMD_FUNC(add_to_channel) { SilcServerCommandContext cmd = (SilcServerCommandContext)context; SilcServer server = cmd->server; SilcClientEntry client; SilcChannelEntry channel; SilcChannelClientEntry chl; char *channel_name; /* Get channel name */ channel_name = silc_argument_get_arg_type(cmd->args, 1, NULL); /* Get client entry */ client = (SilcClientEntry)cmd->sock->user_data; /* Get channel entry */ channel = silc_idlist_find_channel_by_name(server->local_list, channel_name, NULL); if (channel) { /* Join the client to the channel by adding it to channel's user list. Add also the channel to client entry's channels list for fast cross- referencing. */ chl = silc_calloc(1, sizeof(*chl)); //chl->mode = SILC_CHANNEL_UMODE_CHANOP | SILC_CHANNEL_UMODE_CHANFO; chl->client = client; chl->channel = channel; silc_list_add(channel->user_list, chl); silc_list_add(client->channels, chl); } silc_server_command_free(cmd); } /* Internal routine to join channel. The channel sent to this function has been either created or resolved from ID lists. This joins the sent client to the channel. */ static void silc_server_command_join_channel(SilcServer server, SilcServerCommandContext cmd, SilcChannelEntry channel, int created, unsigned int umode) { SilcSocketConnection sock = cmd->sock; unsigned char *tmp; unsigned int tmp_len; unsigned char *passphrase = NULL, mode[4]; SilcClientEntry client; SilcChannelClientEntry chl; SilcBuffer reply, chidp, clidp; if (!channel) return; /* Get passphrase */ tmp = silc_argument_get_arg_type(cmd->args, 2, &tmp_len); if (tmp) { passphrase = silc_calloc(tmp_len, sizeof(*passphrase)); memcpy(passphrase, tmp, tmp_len); } /* * Check channel modes */ /* Check invite list if channel is invite-only channel */ if (channel->mode & SILC_CHANNEL_MODE_INVITE) { if (channel->mode & SILC_CHANNEL_MODE_INVITE_LIST) { /* Invite list is specified. Check whether client is invited in the list. If not, then check whether it has been invited otherwise. */ } else { /* XXX client must be invited to be able to join the channel */ } } /* Check ban list if set */ if (channel->mode & SILC_CHANNEL_MODE_BAN) { } /* Check the channel passphrase if set. */ if (channel->mode & SILC_CHANNEL_MODE_PASSPHRASE) { if (!passphrase || memcmp(channel->mode_data.passphrase, passphrase, strlen(channel->mode_data.passphrase))) { silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN, SILC_STATUS_ERR_BAD_PASSWORD); goto out; } } /* Check user count limit if set. */ if (channel->mode & SILC_CHANNEL_MODE_ULIMIT) { if (silc_list_count(channel->user_list) + 1 > channel->mode_data.user_limit) { silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN, SILC_STATUS_ERR_CHANNEL_IS_FULL); goto out; } } /* * Client is allowed to join to the channel. Make it happen. */ /* If the JOIN request was forwarded to us we will make a bit slower query to get the client pointer. Otherwise, we get the client pointer real easy. */ if (cmd->packet->flags & SILC_PACKET_FLAG_FORWARDED) { void *id = silc_id_str2id(cmd->packet->src_id, cmd->packet->src_id_type); client = silc_idlist_find_client_by_id(server->local_list, id, NULL); if (!client) { /* XXX */ SILC_LOG_ERROR(("Forwarded join command did not find the client who " "wanted to join the channel")); goto out; } silc_free(id); } else { client = (SilcClientEntry)sock->user_data; } /* Check whether the client already is on the channel */ if (silc_server_client_on_channel(client, channel)) { silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN, SILC_STATUS_ERR_USER_ON_CHANNEL); goto out; } /* Generate new channel key as protocol dictates */ if (!created) silc_server_create_channel_key(server, channel, 0); /* Join the client to the channel by adding it to channel's user list. Add also the channel to client entry's channels list for fast cross- referencing. */ chl = silc_calloc(1, sizeof(*chl)); chl->mode = umode; chl->client = client; chl->channel = channel; silc_list_add(channel->user_list, chl); silc_list_add(client->channels, chl); /* Encode Client ID Payload of the original client who wants to join */ clidp = silc_id_payload_encode(client->id, SILC_ID_CLIENT); /* Encode command reply packet */ chidp = silc_id_payload_encode(channel->id, SILC_ID_CHANNEL); SILC_PUT32_MSB(channel->mode, mode); if (!channel->topic) { reply = silc_command_reply_payload_encode_va(SILC_COMMAND_JOIN, SILC_STATUS_OK, 0, 3, 2, channel->channel_name, strlen(channel->channel_name), 3, chidp->data, chidp->len, 4, mode, 4); } else { reply = silc_command_reply_payload_encode_va(SILC_COMMAND_JOIN, SILC_STATUS_OK, 0, 4, 2, channel->channel_name, strlen(channel->channel_name), 3, chidp->data, chidp->len, 4, mode, 4, 5, channel->topic, strlen(channel->topic)); } if (server->server_type == SILC_ROUTER && cmd->packet->flags & SILC_PACKET_FLAG_FORWARDED) { /* We are router and server has forwarded this command to us. Send all replys to the server. */ void *tmpid; /* Send command reply destined to the original client */ tmpid = silc_id_str2id(cmd->packet->src_id, cmd->packet->src_id_type); silc_server_packet_send_dest(cmd->server, sock, SILC_PACKET_COMMAND_REPLY, 0, tmpid, cmd->packet->src_id_type, reply->data, reply->len, FALSE); /* Distribute new channel key to local cell and local clients. */ silc_server_send_channel_key(server, channel, FALSE); /* Distribute JOIN notify into the cell for everbody on the channel */ silc_server_send_notify_to_channel(server, channel, FALSE, SILC_NOTIFY_TYPE_JOIN, 1, clidp->data, clidp->len); /* Broadcast NEW_CHANNEL_USER packet to primary route */ silc_server_send_new_channel_user(server, server->router->connection, TRUE, channel->id, SILC_ID_CHANNEL_LEN, client->id, SILC_ID_CLIENT_LEN); silc_free(tmpid); } else { /* Client sent the command. Send all replies directly to the client. */ /* Send command reply */ silc_server_packet_send(server, sock, SILC_PACKET_COMMAND_REPLY, 0, reply->data, reply->len, FALSE); /* Send the channel key. Channel key is sent before any other packet to the channel. */ silc_server_send_channel_key(server, channel, server->standalone ? FALSE : TRUE); /* Send JOIN notify to locally connected clients on the channel */ silc_server_send_notify_to_channel(server, channel, FALSE, SILC_NOTIFY_TYPE_JOIN, 1, clidp->data, clidp->len); /* Send NEW_CHANNEL_USER packet to our primary router */ if (!server->standalone) silc_server_send_new_channel_user(server, server->router->connection, FALSE, channel->id, SILC_ID_CHANNEL_LEN, client->id, SILC_ID_CLIENT_LEN); /* Send NAMES command reply to the joined channel so the user sees who is currently on the channel. */ silc_server_command_send_names(server, sock, channel); } silc_buffer_free(reply); silc_buffer_free(clidp); silc_buffer_free(chidp); out: if (passphrase) silc_free(passphrase); } /* Server side of command JOIN. Joins client into requested channel. If the channel does not exist it will be created. */ SILC_SERVER_CMD_FUNC(join) { SilcServerCommandContext cmd = (SilcServerCommandContext)context; SilcServer server = cmd->server; int tmp_len; char *tmp, *channel_name = NULL, *cipher = NULL; SilcChannelEntry channel; unsigned int umode = 0; int created = FALSE; SILC_SERVER_COMMAND_CHECK_ARGC(SILC_COMMAND_JOIN, cmd, 1, 3); /* Get channel name */ tmp = silc_argument_get_arg_type(cmd->args, 1, &tmp_len); if (!tmp) { silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN, SILC_STATUS_ERR_NOT_ENOUGH_PARAMS); goto out; } channel_name = tmp; if (silc_server_command_bad_chars(channel_name) == TRUE) { silc_server_command_send_status_reply(cmd, SILC_COMMAND_JOIN, SILC_STATUS_ERR_BAD_CHANNEL); silc_free(channel_name); goto out; } /* Get cipher name */ cipher = silc_argument_get_arg_type(cmd->args, 3, NULL); /* See if the channel exists */ channel = silc_idlist_find_channel_by_name(server->local_list, channel_name, NULL); if (!channel) { /* Channel not found */ /* If we are standalone server we don't have a router, we just create the channel by ourselves. */ if (server->standalone) { channel = silc_server_create_new_channel(server, server->id, cipher, channel_name); umode |= SILC_CHANNEL_UMODE_CHANOP; umode |= SILC_CHANNEL_UMODE_CHANFO; created = TRUE; } else { /* The channel does not exist on our server. If we are normal server we will send JOIN command to our router which will handle the joining procedure (either creates the channel if it doesn't exist or joins the client to it). */ if (server->server_type == SILC_SERVER) { /* Forward the original JOIN command to the router */ silc_buffer_push(cmd->packet->buffer, cmd->packet->buffer->data - cmd->packet->buffer->head); silc_server_packet_forward(server, (SilcSocketConnection) server->router->connection, cmd->packet->buffer->data, cmd->packet->buffer->len, TRUE); /* Register handler that will be called after the router has replied to us. We will add the client to the new channel in this callback function. Will be called from JOIN command reply. */ silc_server_command_pending(server, SILC_COMMAND_JOIN, ++server->router->data.cmd_ident, silc_server_command_add_to_channel, context); return; } /* We are router and the channel does not seem exist so we will check our global list as well for the channel. */ channel = silc_idlist_find_channel_by_name(server->global_list, channel_name, NULL); if (!channel) { /* Channel really does not exist, create it */ channel = silc_server_create_new_channel(server, server->id, cipher, channel_name); umode |= SILC_CHANNEL_UMODE_CHANOP; umode |= SILC_CHANNEL_UMODE_CHANFO; created = TRUE; } } } /* Join to the channel */ silc_server_command_join_channel(server, cmd, channel, created, umode); out: silc_server_command_free(cmd); } /* Server side of command MOTD. Sends server's current "message of the day" to the client. */ SILC_SERVER_CMD_FUNC(motd) { SilcServerCommandContext cmd = (SilcServerCommandContext)context; SilcServer server = cmd->server; char *motd; int motd_len; SILC_SERVER_COMMAND_CHECK_ARGC(SILC_COMMAND_MOTD, cmd, 1, 2); /* XXX show currently only our motd */ if (server->config && server->config->motd && server->config->motd->motd_file) { /* Send motd */ motd = silc_file_read(server->config->motd->motd_file, &motd_len); if (!motd) goto out; motd[motd_len] = 0; silc_server_command_send_status_data(cmd, SILC_COMMAND_MOTD, SILC_STATUS_OK, 2, motd, motd_len); goto out; } else { /* No motd */ silc_server_command_send_status_reply(cmd, SILC_COMMAND_MOTD, SILC_STATUS_OK); } out: silc_server_command_free(cmd); } SILC_SERVER_CMD_FUNC(umode) { } /* Checks that client has rights to add or remove channel modes. If any of the checks fails FALSE is returned. */ int silc_server_check_cmode_rights(SilcChannelEntry channel, SilcChannelClientEntry client, unsigned int mode) { int is_op = client->mode & SILC_CHANNEL_UMODE_CHANOP; int is_fo = client->mode & SILC_CHANNEL_UMODE_CHANFO; /* Check whether has rights to change anything */ if (!is_op && !is_fo) return FALSE; /* Check whether has rights to change everything */ if (is_op && is_fo) return TRUE; /* We know that client is channel operator, check that they are not changing anything that requires channel founder rights. Rest of the modes are available automatically for channel operator. */ if (mode & SILC_CHANNEL_MODE_PRIVKEY) { if (is_op && !is_fo) return FALSE; } else { if (channel->mode & SILC_CHANNEL_MODE_PRIVKEY) { if (is_op && !is_fo) return FALSE; } } if (mode & SILC_CHANNEL_MODE_PASSPHRASE) { if (is_op && !is_fo) return FALSE; } else { if (channel->mode & SILC_CHANNEL_MODE_PASSPHRASE) { if (is_op && !is_fo) return FALSE; } } if (mode & SILC_CHANNEL_MODE_CIPHER) { if (is_op && !is_fo) return FALSE; } else { if (channel->mode & SILC_CHANNEL_MODE_CIPHER) { if (is_op && !is_fo) return FALSE; } } return TRUE; } /* Server side command of CMODE. Changes channel mode */ SILC_SERVER_CMD_FUNC(cmode) { SilcServerCommandContext cmd = (SilcServerCommandContext)context; SilcServer server = cmd->server; SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data; SilcChannelID *channel_id; SilcChannelEntry channel; SilcChannelClientEntry chl; SilcBuffer packet, cidp; unsigned char *tmp, *tmp_id, *tmp_mask; unsigned int argc, mode_mask, tmp_len, tmp_len2; SILC_LOG_DEBUG(("Start")); argc = silc_argument_get_arg_num(cmd->args); if (argc < 2) { silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE, SILC_STATUS_ERR_NOT_ENOUGH_PARAMS); goto out; } if (argc > 8) { silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE, SILC_STATUS_ERR_TOO_MANY_PARAMS); goto out; } /* Get Channel ID */ tmp_id = silc_argument_get_arg_type(cmd->args, 1, &tmp_len2); if (!tmp_id) { silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE, SILC_STATUS_ERR_NO_CHANNEL_ID); goto out; } channel_id = silc_id_payload_parse_id(tmp_id, tmp_len2); /* Get the channel mode mask */ tmp_mask = silc_argument_get_arg_type(cmd->args, 2, &tmp_len); if (!tmp_mask) { silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE, SILC_STATUS_ERR_NOT_ENOUGH_PARAMS); goto out; } SILC_GET32_MSB(mode_mask, tmp_mask); /* Get channel entry */ channel = silc_idlist_find_channel_by_id(server->local_list, channel_id, NULL); if (!channel) { silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE, SILC_STATUS_ERR_NO_SUCH_CHANNEL); goto out; } /* Check whether this client is on the channel */ if (!silc_server_client_on_channel(client, channel)) { silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE, SILC_STATUS_ERR_NOT_ON_CHANNEL); goto out; } /* 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) break; /* Check that client has rights to change any requested channel modes */ if (!silc_server_check_cmode_rights(channel, chl, mode_mask)) { silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE, SILC_STATUS_ERR_NO_CHANNEL_PRIV); goto out; } /* * Check the modes. Modes that requires nothing special operation are * not checked here. */ if (mode_mask & SILC_CHANNEL_MODE_PRIVKEY) { /* Channel uses private keys to protect traffic. Client(s) has set the key locally they want to use, server does not know that key. */ /* Nothing interesting to do here now */ } else { if (channel->mode & SILC_CHANNEL_MODE_PRIVKEY) { /* The mode is removed and we need to generate and distribute new channel key. Clients are not using private channel keys anymore after this. */ /* XXX Duplicated code, make own function for this!! LEAVE uses this as well */ /* Re-generate channel key */ silc_server_create_channel_key(server, channel, 0); /* Encode channel key payload to be distributed on the channel */ packet = silc_channel_key_payload_encode(tmp_len2, tmp_id, strlen(channel->channel_key-> cipher->name), channel->channel_key->cipher->name, channel->key_len / 8, channel->key); /* If we are normal server then we will send it to our router. If we are router we will send it to all local servers that has clients on the channel */ if (server->server_type == SILC_SERVER) { if (!server->standalone) silc_server_packet_send(server, cmd->server->router->connection, SILC_PACKET_CHANNEL_KEY, 0, packet->data, packet->len, TRUE); } else { } /* Send to locally connected clients on the channel */ silc_server_packet_send_local_channel(server, channel, SILC_PACKET_CHANNEL_KEY, 0, packet->data, packet->len, FALSE); silc_buffer_free(packet); } } if (mode_mask & SILC_CHANNEL_MODE_ULIMIT) { /* User limit is set on channel */ unsigned int user_limit; /* Get user limit */ tmp = silc_argument_get_arg_type(cmd->args, 3, NULL); if (!tmp) { if (!(channel->mode & SILC_CHANNEL_MODE_ULIMIT)) { silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE, SILC_STATUS_ERR_NOT_ENOUGH_PARAMS); goto out; } } else { SILC_GET32_MSB(user_limit, tmp); channel->mode_data.user_limit = user_limit; } } else { if (channel->mode & SILC_CHANNEL_MODE_ULIMIT) /* User limit mode is unset. Remove user limit */ channel->mode_data.user_limit = 0; } if (mode_mask & SILC_CHANNEL_MODE_PASSPHRASE) { if (!(channel->mode & SILC_CHANNEL_MODE_PASSPHRASE)) { /* Passphrase has been set to channel */ /* Get the passphrase */ tmp = silc_argument_get_arg_type(cmd->args, 4, NULL); if (!tmp) { silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE, SILC_STATUS_ERR_NOT_ENOUGH_PARAMS); goto out; } /* Save the passphrase */ channel->mode_data.passphrase = strdup(tmp); } } else { if (channel->mode & SILC_CHANNEL_MODE_PASSPHRASE) { /* Passphrase mode is unset. remove the passphrase */ if (channel->mode_data.passphrase) { silc_free(channel->mode_data.passphrase); channel->mode_data.passphrase = NULL; } } } if (mode_mask & SILC_CHANNEL_MODE_BAN) { if (!(channel->mode & SILC_CHANNEL_MODE_BAN)) { /* Ban list is specified for channel */ /* Get ban list */ tmp = silc_argument_get_arg_type(cmd->args, 5, NULL); if (!tmp) { silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE, SILC_STATUS_ERR_NOT_ENOUGH_PARAMS); goto out; } /* XXX check that channel founder is not banned */ /* Save the ban list */ channel->mode_data.ban_list = strdup(tmp); } } else { if (channel->mode & SILC_CHANNEL_MODE_BAN) { /* Ban mode is unset. Remove the entire ban list */ if (channel->mode_data.ban_list) { silc_free(channel->mode_data.ban_list); channel->mode_data.ban_list = NULL; } } } if (mode_mask & SILC_CHANNEL_MODE_INVITE_LIST) { if (!(channel->mode & SILC_CHANNEL_MODE_INVITE_LIST)) { /* Invite list is specified for channel */ /* Get invite list */ tmp = silc_argument_get_arg_type(cmd->args, 6, NULL); if (!tmp) { silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE, SILC_STATUS_ERR_NOT_ENOUGH_PARAMS); goto out; } /* Save the invite linst */ channel->mode_data.invite_list = strdup(tmp); } } else { if (channel->mode & SILC_CHANNEL_MODE_INVITE_LIST) { /* Invite list mode is unset. Remove the entire invite list */ if (channel->mode_data.invite_list) { silc_free(channel->mode_data.invite_list); channel->mode_data.invite_list = NULL; } } } if (mode_mask & SILC_CHANNEL_MODE_CIPHER) { if (!(channel->mode & SILC_CHANNEL_MODE_CIPHER)) { /* Cipher to use protect the traffic */ unsigned int key_len = 128; char *cp; /* Get cipher */ tmp = silc_argument_get_arg_type(cmd->args, 8, NULL); if (!tmp) { silc_server_command_send_status_reply(cmd, SILC_COMMAND_CMODE, SILC_STATUS_ERR_NOT_ENOUGH_PARAMS); goto out; } cp = strchr(tmp, ':'); if (cp) { key_len = atoi(cp); *cp = '\0'; } /* XXX Duplicated code, make own function for this!! */ /* Delete old cipher and allocate the new one */ silc_cipher_free(channel->channel_key); silc_cipher_alloc(tmp, &channel->channel_key); key_len /= 8; if (key_len > 32) key_len = 32; /* Re-generate channel key */ silc_server_create_channel_key(server, channel, key_len); /* Encode channel key payload to be distributed on the channel */ packet = silc_channel_key_payload_encode(tmp_len2, tmp_id, strlen(channel->channel_key-> cipher->name), channel->channel_key->cipher->name, channel->key_len / 8, channel->key); /* If we are normal server then we will send it to our router. If we are router we will send it to all local servers that has clients on the channel */ if (server->server_type == SILC_SERVER) { if (!server->standalone) silc_server_packet_send(server, cmd->server->router->connection, SILC_PACKET_CHANNEL_KEY, 0, packet->data, packet->len, TRUE); } else { } /* Send to locally connected clients on the channel */ silc_server_packet_send_local_channel(server, channel, SILC_PACKET_CHANNEL_KEY, 0, packet->data, packet->len, FALSE); silc_buffer_free(packet); } } else { if (channel->mode & SILC_CHANNEL_MODE_CIPHER) { /* Cipher mode is unset. Remove the cipher and revert back to default cipher */ if (channel->mode_data.cipher) { silc_free(channel->mode_data.cipher); channel->mode_data.cipher = NULL; channel->mode_data.key_len = 0; } /* Generate new cipher and key for the channel */ /* XXX Duplicated code, make own function for this!! */ /* Delete old cipher and allocate default one */ silc_cipher_free(channel->channel_key); if (!channel->cipher) silc_cipher_alloc("twofish", &channel->channel_key); else silc_cipher_alloc(channel->cipher, &channel->channel_key); /* Re-generate channel key */ silc_server_create_channel_key(server, channel, 0); /* Encode channel key payload to be distributed on the channel */ packet = silc_channel_key_payload_encode(tmp_len2, tmp_id, strlen(channel->channel_key-> cipher->name), channel->channel_key->cipher->name, channel->key_len / 8, channel->key); /* If we are normal server then we will send it to our router. If we are router we will send it to all local servers that has clients on the channel */ if (server->server_type == SILC_SERVER) { if (!server->standalone) silc_server_packet_send(server, cmd->server->router->connection, SILC_PACKET_CHANNEL_KEY, 0, packet->data, packet->len, TRUE); } else { } /* Send to locally connected clients on the channel */ silc_server_packet_send_local_channel(server, channel, SILC_PACKET_CHANNEL_KEY, 0, packet->data, packet->len, FALSE); silc_buffer_free(packet); } } /* Finally, set the mode */ channel->mode = mode_mask; /* Send CMODE_CHANGE notify */ cidp = silc_id_payload_encode(client->id, SILC_ID_CLIENT); silc_server_send_notify_to_channel(server, channel, TRUE, SILC_NOTIFY_TYPE_CMODE_CHANGE, 2, cidp->data, cidp->len, tmp_mask, tmp_len); silc_free(cidp); /* Send command reply to sender */ packet = silc_command_reply_payload_encode_va(SILC_COMMAND_CMODE, SILC_STATUS_OK, 0, 1, 2, tmp_mask, 4); silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0, packet->data, packet->len, FALSE); silc_buffer_free(packet); silc_free(channel_id); out: silc_server_command_free(cmd); } /* Server side of CUMODE command. Changes client's mode on a channel. */ SILC_SERVER_CMD_FUNC(cumode) { SilcServerCommandContext cmd = (SilcServerCommandContext)context; SilcServer server = cmd->server; SilcClientEntry client = (SilcClientEntry)cmd->sock->user_data; SilcChannelID *channel_id; SilcClientID *client_id; SilcChannelEntry channel; SilcClientEntry target_client; SilcChannelClientEntry chl; SilcBuffer packet, idp; unsigned char *tmp_id, *tmp_mask; unsigned int target_mask, sender_mask, tmp_len; int notify = FALSE; SILC_SERVER_COMMAND_CHECK_ARGC(SILC_COMMAND_CUMODE, cmd, 3, 3); /* Get Channel ID */ tmp_id = silc_argument_get_arg_type(cmd->args, 1, &tmp_len); if (!tmp_id) { silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE, SILC_STATUS_ERR_NO_CHANNEL_ID); goto out; } channel_id = silc_id_payload_parse_id(tmp_id, tmp_len); /* Get channel entry */ channel = silc_idlist_find_channel_by_id(server->local_list, channel_id, NULL); if (!channel) { silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE, SILC_STATUS_ERR_NO_SUCH_CHANNEL); goto out; } /* Check whether sender is on the channel */ if (!silc_server_client_on_channel(client, channel)) { silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE, SILC_STATUS_ERR_NOT_ON_CHANNEL); goto out; } /* Check that client has rights to change other's rights */ silc_list_start(channel->user_list); while ((chl = silc_list_get(channel->user_list)) != SILC_LIST_END) { if (chl->client == client) { if (!(chl->mode & SILC_CHANNEL_UMODE_CHANFO) && !(chl->mode & SILC_CHANNEL_UMODE_CHANOP)) { silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE, SILC_STATUS_ERR_NO_CHANNEL_PRIV); goto out; } sender_mask = chl->mode; break; } } /* Get the target client's channel mode mask */ tmp_mask = silc_argument_get_arg_type(cmd->args, 2, NULL); if (!tmp_mask) { silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE, SILC_STATUS_ERR_NOT_ENOUGH_PARAMS); goto out; } SILC_GET32_MSB(target_mask, tmp_mask); /* Get target Client ID */ tmp_id = silc_argument_get_arg_type(cmd->args, 3, &tmp_len); if (!tmp_id) { silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE, SILC_STATUS_ERR_NO_CHANNEL_ID); goto out; } client_id = silc_id_payload_parse_id(tmp_id, tmp_len); /* Get target client's entry */ target_client = silc_idlist_find_client_by_id(server->local_list, client_id, NULL); if (!target_client) { /* XXX If target client is not one of mine send to primary route */ } /* Check whether target client is on the channel */ if (!silc_server_client_on_channel(target_client, channel)) { silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE, SILC_STATUS_ERR_USER_NOT_ON_CHANNEL); goto out; } /* 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 == target_client) break; /* * Change the mode */ /* If the target client is founder, no one else can change their mode but themselves. */ if (chl->mode & SILC_CHANNEL_UMODE_CHANFO && chl->client != target_client) { silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE, SILC_STATUS_ERR_NOT_YOU); goto out; } if (target_mask & SILC_CHANNEL_UMODE_CHANFO) { /* Cannot promote anyone to channel founder */ silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE, SILC_STATUS_ERR_NOT_YOU); goto out; } else { if (chl->mode & SILC_CHANNEL_UMODE_CHANFO) { if (target_client == client) { /* Remove channel founder rights from itself */ chl->mode &= ~SILC_CHANNEL_UMODE_CHANFO; notify = TRUE; } else { silc_server_command_send_status_reply(cmd, SILC_COMMAND_CUMODE, SILC_STATUS_ERR_NOT_YOU); goto out; } } } if (target_mask & SILC_CHANNEL_UMODE_CHANOP) { /* Promote to operator */ if (!(chl->mode & SILC_CHANNEL_UMODE_CHANOP)) { chl->mode |= SILC_CHANNEL_UMODE_CHANOP; notify = TRUE; } } else { if (chl->mode & SILC_CHANNEL_UMODE_CHANOP) { /* Demote to normal user */ chl->mode &= ~SILC_CHANNEL_UMODE_CHANOP; notify = TRUE; } } /* Send notify to channel, notify only if mode was actually changed. */ if (notify) { idp = silc_id_payload_encode(client->id, SILC_ID_CLIENT); silc_server_send_notify_to_channel(server, channel, TRUE, SILC_NOTIFY_TYPE_CUMODE_CHANGE, 3, idp->data, idp->len, tmp_mask, 4, tmp_id, tmp_len); silc_buffer_free(idp); } /* Send command reply to sender */ packet = silc_command_reply_payload_encode_va(SILC_COMMAND_CUMODE, SILC_STATUS_OK, 0, 2, 2, tmp_mask, 4, 3, tmp_id, tmp_len); silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0, packet->data, packet->len, FALSE); silc_buffer_free(packet); silc_free(channel_id); silc_free(client_id); out: silc_server_command_free(cmd); } /* Server side of KICK command. Kicks client out of channel. */ SILC_SERVER_CMD_FUNC(kick) { } SILC_SERVER_CMD_FUNC(restart) { } SILC_SERVER_CMD_FUNC(close) { } SILC_SERVER_CMD_FUNC(die) { } SILC_SERVER_CMD_FUNC(silcoper) { } /* Server side command of LEAVE. Removes client from a channel. */ SILC_SERVER_CMD_FUNC(leave) { SilcServerCommandContext cmd = (SilcServerCommandContext)context; SilcServer server = cmd->server; SilcSocketConnection sock = cmd->sock; SilcClientEntry id_entry = (SilcClientEntry)cmd->sock->user_data; SilcChannelID *id; SilcChannelEntry channel; SilcBuffer packet; unsigned int i, len; unsigned char *tmp; SILC_SERVER_COMMAND_CHECK_ARGC(SILC_COMMAND_LEAVE, cmd, 1, 2); /* Get Channel ID */ tmp = silc_argument_get_arg_type(cmd->args, 1, &len); if (!tmp) { silc_server_command_send_status_reply(cmd, SILC_COMMAND_LEAVE, SILC_STATUS_ERR_NO_CHANNEL_ID); goto out; } id = silc_id_payload_parse_id(tmp, len); /* Get channel entry */ channel = silc_idlist_find_channel_by_id(server->local_list, id, NULL); if (!channel) { silc_server_command_send_status_reply(cmd, SILC_COMMAND_LEAVE, SILC_STATUS_ERR_NO_SUCH_CHANNEL); goto out; } /* Check whether this client is on the channel */ if (!silc_server_client_on_channel(id_entry, channel)) { silc_server_command_send_status_reply(cmd, SILC_COMMAND_LEAVE, SILC_STATUS_ERR_NOT_ON_CHANNEL); goto out; } /* Notify routers that they should remove this client from their list of clients on the channel. */ if (!server->standalone) silc_server_send_remove_channel_user(server, server->router->connection, server->server_type == SILC_ROUTER ? TRUE : FALSE, id_entry->id, id); /* Remove client from channel */ i = silc_server_remove_from_one_channel(server, sock, channel, id_entry, TRUE); silc_server_command_send_status_reply(cmd, SILC_COMMAND_LEAVE, SILC_STATUS_OK); /* If the channel does not exist anymore we won't send anything */ if (!i) goto out; /* Re-generate channel key */ silc_server_create_channel_key(server, channel, 0); /* Encode channel key payload to be distributed on the channel */ packet = silc_channel_key_payload_encode(len, tmp, strlen(channel->channel_key->cipher->name), channel->channel_key->cipher->name, channel->key_len / 8, channel->key); /* If we are normal server then we will send it to our router. If we are router we will send it to all local servers that has clients on the channel */ if (server->server_type == SILC_SERVER) { if (!server->standalone) silc_server_packet_send(server, cmd->server->router->connection, SILC_PACKET_CHANNEL_KEY, 0, packet->data, packet->len, TRUE); } else { } /* Send to locally connected clients on the channel */ silc_server_packet_send_local_channel(server, channel, SILC_PACKET_CHANNEL_KEY, 0, packet->data, packet->len, FALSE); silc_buffer_free(packet); silc_free(id); out: silc_server_command_free(cmd); } /* Server side of command NAMES. Resolves clients and their names currently joined on the requested channel. The name list is sent back to the client. */ SILC_SERVER_CMD_FUNC(names) { SilcServerCommandContext cmd = (SilcServerCommandContext)context; SilcServer server = cmd->server; SilcChannelEntry channel; SilcChannelClientEntry chl; SilcChannelID *id; SilcBuffer packet; unsigned int i, len, len2, tmp_len; unsigned char *tmp; char *name_list = NULL, *n; SilcBuffer client_id_list; SilcBuffer client_mode_list; SILC_SERVER_COMMAND_CHECK_ARGC(SILC_COMMAND_NAMES, cmd, 1, 2); /* Get Channel ID */ tmp = silc_argument_get_arg_type(cmd->args, 1, &tmp_len); if (!tmp) { silc_server_command_send_status_reply(cmd, SILC_COMMAND_LEAVE, SILC_STATUS_ERR_NO_CHANNEL_ID); goto out; } id = silc_id_payload_parse_id(tmp, tmp_len); /* Check whether the channel exists. If we are normal server and the channel does not exist we will send this same command to our router which will know if the channel exists. */ channel = silc_idlist_find_channel_by_id(server->local_list, id, NULL); if (!channel) { if (server->server_type == SILC_SERVER && !server->standalone) { /* XXX Send names command */ cmd->pending = TRUE; silc_server_command_pending(server, SILC_COMMAND_NAMES, 0, silc_server_command_names, context); return; } silc_server_command_send_status_reply(cmd, SILC_COMMAND_INVITE, SILC_STATUS_ERR_NO_SUCH_CHANNEL); goto out; } /* Assemble the name list now */ name_list = NULL; len = 0; silc_list_start(channel->user_list); i = 0; while ((chl = silc_list_get(channel->user_list)) != SILC_LIST_END) { n = chl->client->nickname; if (n) { len2 = strlen(n); len += len2; name_list = silc_realloc(name_list, sizeof(*name_list) * (len + 1)); memcpy(name_list + (len - len2), n, len2); name_list[len] = 0; if (i == silc_list_count(channel->user_list) - 1) break; memcpy(name_list + len, ",", 1); len++; i++; } } if (!name_list) name_list = ""; /* Assemble the Client ID list now */ client_id_list = silc_buffer_alloc((SILC_ID_CLIENT_LEN + 4) * silc_list_count(channel->user_list)); silc_buffer_pull_tail(client_id_list, SILC_BUFFER_END(client_id_list)); silc_list_start(channel->user_list); while ((chl = silc_list_get(channel->user_list)) != SILC_LIST_END) { SilcBuffer idp; idp = silc_id_payload_encode(chl->client->id, SILC_ID_CLIENT); silc_buffer_format(client_id_list, SILC_STR_UI_XNSTRING(idp->data, idp->len), SILC_STR_END); silc_buffer_pull(client_id_list, idp->len); silc_buffer_free(idp); } silc_buffer_push(client_id_list, client_id_list->data - client_id_list->head); /* Assemble mode list */ client_mode_list = silc_buffer_alloc(4 * silc_list_count(channel->user_list)); silc_buffer_pull_tail(client_mode_list, SILC_BUFFER_END(client_mode_list)); silc_list_start(channel->user_list); while ((chl = silc_list_get(channel->user_list)) != SILC_LIST_END) { SILC_PUT32_MSB(chl->mode, client_mode_list->data); silc_buffer_pull(client_mode_list, 4); } silc_buffer_push(client_mode_list, client_mode_list->data - client_mode_list->head); /* Send reply */ packet = silc_command_reply_payload_encode_va(SILC_COMMAND_NAMES, SILC_STATUS_OK, 0, 4, 2, tmp, tmp_len, 3, name_list, strlen(name_list), 4, client_id_list->data, client_id_list->len, 5, client_mode_list->data, client_mode_list->len); silc_server_packet_send(server, cmd->sock, SILC_PACKET_COMMAND_REPLY, 0, packet->data, packet->len, FALSE); silc_buffer_free(packet); silc_free(name_list); silc_buffer_free(client_id_list); silc_buffer_free(client_mode_list); silc_free(id); out: silc_server_command_free(cmd); }