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/* 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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