/* server_backup.h Author: Pekka Riikonen Copyright (C) 2001 - 2003, 2007 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; version 2 of the License. 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. */ #ifndef SERVER_BACKUP_H #define SERVER_BACKUP_H /* Backup resuming protocol types */ #define SILC_SERVER_BACKUP_START 1 /* Start protocol */ #define SILC_SERVER_BACKUP_CONNECTED 2 /* Connected to primary */ #define SILC_SERVER_BACKUP_ENDING 3 /* Giving up as primary */ #define SILC_SERVER_BACKUP_RESUMED 4 /* Primary is back online */ #define SILC_SERVER_BACKUP_REPLACED 20 /* Primary has been replaced */ #define SILC_SERVER_BACKUP_START_USE 21 /* Start use backup as primary */ /* Adds the `backup_server' to be one of our backup router. This can be called multiple times to set multiple backup routers. The `replacing' is the IP and port that the `backup_router' will replace if the `replacing' will become unresponsive. If `local' is TRUE then the `backup_server' is in the local cell, if FALSE it is in some other cell. */ void silc_server_backup_add(SilcServer server, SilcServerEntry backup_server, const char *ip, int port, SilcBool local); /* Returns backup router for IP and port in `server_id' or NULL if there does not exist backup router. */ SilcServerEntry silc_server_backup_get(SilcServer server, SilcServerID *server_id); /* Deletes the backup server `server_entry'. */ void silc_server_backup_del(SilcServer server, SilcServerEntry server_entry); /* Frees all data allocated for backup routers. Call this after deleting all backup routers and when new routers are added no more, for example when shutting down the server. */ void silc_server_backup_free(SilcServer server); /* Marks the IP address and port from the `server_id' as being replaced by backup router indicated by the `server'. If the router connects at a later time we can check whether it has been replaced by an backup router. */ void silc_server_backup_replaced_add(SilcServer server, SilcServerID *server_id, SilcServerEntry server_entry); /* Checks whether the IP address and port from the `server_id' has been replaced by an backup router. If it has been then this returns TRUE and the bacup router entry to the `server' pointer if non-NULL. Returns FALSE if the router is not replaced by backup router. */ SilcBool silc_server_backup_replaced_get(SilcServer server, SilcServerID *server_id, SilcServerEntry *server_entry); /* Deletes a replaced host by the set `server_entry. */ void silc_server_backup_replaced_del(SilcServer server, SilcServerEntry server_entry); /* Broadcast the received packet indicated by `packet' to all of our backup routers. All router wide information is passed using broadcast packets. That is why all backup routers need to get this data too. It is expected that the caller already knows that the `packet' is broadcast packet. */ void silc_server_backup_broadcast(SilcServer server, SilcPacketStream sender, SilcPacket packet); /* A generic routine to send data to all backup routers. If the `sender' is provided it will indicate the original sender of the packet and the packet won't be resent to that entity. The `data' is the data that will be assembled to packet context before sending. The packet will be encrypted this function. If the `force_send' is TRUE the data is sent immediately and not put to queue. If `local' is TRUE then the packet will be sent only to local backup routers inside the cell. If false the packet can go from one cell to the other. This function has no effect if there are no any backup routers. */ void silc_server_backup_send(SilcServer server, SilcServerEntry sender, SilcPacketType type, SilcPacketFlags flags, unsigned char *data, SilcUInt32 data_len, SilcBool force_send, SilcBool local); /* Same as silc_server_backup_send but sets a specific Destination ID to the packet. The Destination ID is indicated by the `dst_id' and the ID type `dst_id_type'. For example, packets destined to channels must be sent using this function. */ void silc_server_backup_send_dest(SilcServer server, SilcServerEntry sender, SilcPacketType type, SilcPacketFlags flags, void *dst_id, SilcIdType dst_id_type, unsigned char *data, SilcUInt32 data_len, SilcBool force_send, SilcBool local); /* Send the START_USE indication to remote connection. If `failure' is TRUE then this sends SILC_PACKET_FAILURE. Otherwise it sends SILC_PACKET_RESUME_ROUTER. */ void silc_server_backup_send_start_use(SilcServer server, SilcPacketStream sock, SilcBool failure); /* Send the REPLACED indication to remote router. This is send by the primary router (remote router) of the primary router that came back online. This is not sent by backup router or any other server. */ void silc_server_backup_send_replaced(SilcServer server, SilcPacketStream sock); /* Processes incoming RESUME_ROUTER packet. This can give the packet for processing to the protocol handler or allocate new protocol if start command is received. */ void silc_server_backup_resume_router(SilcServer server, SilcPacketStream sock, SilcPacket packet); /* Called when we've established connection back to our primary router when we've acting as backup router and have replaced the primary router in the cell. This function will start the backup resuming protocol. */ void silc_server_backup_connected(SilcServer server, SilcServerEntry server_entry, void *context); /* Backup resuming protocol. This protocol is executed when the primary router wants to resume its position as being primary router. */ SILC_TASK_CALLBACK(silc_server_protocol_backup); #endif /* SERVER_BACKUP_H */