/* This software was written by Dirk Engling It is considered beerware. Prost. Skol. Cheers or whatever. $id$ */ #ifndef OT_LIVESYNC_H__ #define OT_LIVESYNC_H__ #include "io.h" #include "trackerlogic.h" /* Syncing is done as udp packets in the multicast domain 224.0.42.5 port 9696 Each tracker should join the multicast group and send its live sync packets to that group, using a ttl of 1 Format of all sync packets is straight forward, packet type determines which kind of packet this is: 0x0000 0x04 id of tracker instance 0x0004 0x04 packet type ######## ######## PEER SYNC PROTOCOL ######## ######## Each tracker instance accumulates announce requests until its buffer is full or a timeout is reached. Then it broadcasts its live sync packer: packet type SYNC_LIVE4 [ 0x0008 0x14 info_hash 0x001c 0x04 peer's ipv4 address 0x0020 0x02 peer's port 0x0024 0x02 peer flags v1 ( SEEDING = 0x80, COMPLETE = 0x40, STOPPED = 0x20 ) ]* packet type SYNC_LIVE6 [ 0x0008 0x14 info_hash 0x001c 0x10 peer's ipv6 address 0x002c 0x02 peer's port 0x002e 0x02 peer flags v1 ( SEEDING = 0x80, COMPLETE = 0x40, STOPPED = 0x20 ) ]* */ #ifdef WANT_SYNC_LIVE #define LIVESYNC_PORT 9696 void livesync_init(); void livesync_deinit(); /* Join multicast group for listening and create sending socket */ void livesync_bind_mcast( char *ip, uint16_t port ); /* Inform live sync about whats going on. */ void livesync_tell( struct ot_workstruct *ws ); /* Tickle the live sync module from time to time, so no events get stuck when there's not enough traffic to fill udp packets fast enough */ void livesync_ticker( ); /* Handle an incoming live sync packet */ void handle_livesync( const int64 sock ); #else /* If no syncing is required, save calling code from #ifdef constructions */ #define livesync_deinit() #define livesync_init() #define livesync_ticker() #define handle_livesync(a) #endif #endif