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102 lines
3.3 KiB
102 lines
3.3 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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/* System */ |
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#include <string.h> |
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/* Libowfat */ |
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#include "socket.h" |
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#include "io.h" |
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/* Opentracker */ |
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#include "trackerlogic.h" |
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#include "ot_udp.h" |
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#include "ot_stats.h" |
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/* UDP implementation according to http://xbtt.sourceforge.net/udp_tracker_protocol.html */ |
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void handle_udp4( int64 serversocket ) { |
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ot_peer peer; |
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ot_torrent *torrent; |
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ot_hash *hash = NULL; |
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char remoteip[4]; |
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ot_dword *inpacket = (ot_dword*)static_inbuf; |
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ot_dword *outpacket = (ot_dword*)static_outbuf; |
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ot_dword numwant, left, event; |
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ot_word port, remoteport; |
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size_t r, r_out; |
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r = socket_recv4( serversocket, static_inbuf, sizeof( static_inbuf ), remoteip, &remoteport); |
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stats_issue_event( EVENT_ACCEPT, 0, 0 ); |
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stats_issue_event( EVENT_READ, 0, r ); |
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/* Minimum udp tracker packet size, also catches error */ |
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if( r < 16 ) |
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return; |
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/* look for udp bittorrent magic id */ |
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if( (ntohl(inpacket[0]) != 0x00000417) || (ntohl(inpacket[1]) != 0x27101980) ) |
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return; |
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switch( ntohl( inpacket[2] ) ) { |
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case 0: /* This is a connect action */ |
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outpacket[0] = 0; outpacket[1] = inpacket[3]; |
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outpacket[2] = inpacket[0]; outpacket[3] = inpacket[1]; |
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socket_send4( serversocket, static_outbuf, 16, remoteip, remoteport ); |
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stats_issue_event( EVENT_CONNECT, 0, 16 ); |
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break; |
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case 1: /* This is an announce action */ |
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/* Minimum udp announce packet size */ |
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if( r < 98 ) |
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return; |
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numwant = 200; |
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/* We do only want to know, if it is zero */ |
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left = inpacket[64/4] | inpacket[68/4]; |
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event = ntohl( inpacket[80/4] ); |
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port = *(ot_word*)( static_inbuf + 96 ); |
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hash = (ot_hash*)( static_inbuf + 16 ); |
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OT_SETIP( &peer, remoteip ); |
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OT_SETPORT( &peer, &port ); |
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OT_FLAG( &peer ) = 0; |
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switch( event ) { |
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case 1: OT_FLAG( &peer ) |= PEER_FLAG_COMPLETED; break; |
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case 3: OT_FLAG( &peer ) |= PEER_FLAG_STOPPED; break; |
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default: break; |
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} |
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if( !left ) |
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OT_FLAG( &peer ) |= PEER_FLAG_SEEDING; |
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outpacket[0] = htonl( 1 ); /* announce action */ |
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outpacket[1] = inpacket[12/4]; |
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if( OT_FLAG( &peer ) & PEER_FLAG_STOPPED ) /* Peer is gone. */ |
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r = remove_peer_from_torrent( hash, &peer, static_outbuf, 0 ); |
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else { |
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torrent = add_peer_to_torrent( hash, &peer WANT_TRACKER_SYNC_PARAM( 0 ) ); |
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if( !torrent ) |
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return; /* XXX maybe send error */ |
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r = 8 + return_peers_for_torrent( hash, numwant, static_outbuf + 8, 0 ); |
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} |
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socket_send4( serversocket, static_outbuf, r, remoteip, remoteport ); |
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stats_issue_event( EVENT_ANNOUNCE, 0, r ); |
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break; |
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case 2: /* This is a scrape action */ |
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outpacket[0] = htonl( 2 ); /* scrape action */ |
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outpacket[1] = inpacket[12/4]; |
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for( r_out = 0; ( r_out * 20 < r - 16) && ( r_out <= 74 ); r_out++ ) |
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return_udp_scrape_for_torrent( (ot_hash*)( static_inbuf + 16 + 20 * r_out ), static_outbuf + 8 + 12 * r_out ); |
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socket_send4( serversocket, static_outbuf, 8 + 12 * r_out, remoteip, remoteport ); |
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stats_issue_event( EVENT_SCRAPE, 0, r ); |
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break; |
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} |
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}
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