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