mirror of
https://github.com/transmission/transmission
synced 2024-12-25 17:17:31 +00:00
d717248e75
Previously we made sure to include stdbool.h (via transmission.h) before utp.h, since the latter used 'bool' without defining it. The new snapshot defines it unconditionally in non-C++ code, so now we need to include it first.
1324 lines
34 KiB
C
1324 lines
34 KiB
C
/*
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* This file Copyright (C) Mnemosyne LLC
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*
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* This file is licensed by the GPL version 2. Works owned by the
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* Transmission project are granted a special exemption to clause 2(b)
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* so that the bulk of its code can remain under the MIT license.
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* This exemption does not extend to derived works not owned by
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* the Transmission project.
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*
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* $Id$
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*/
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#include <assert.h>
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#include <errno.h>
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#include <string.h>
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#include <event2/event.h>
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#include <event2/buffer.h>
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#include <event2/bufferevent.h>
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#include <libutp/utp.h>
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#include "transmission.h"
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#include "session.h"
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#include "bandwidth.h"
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#include "crypto.h"
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#include "net.h"
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#include "peer-common.h" /* MAX_BLOCK_SIZE */
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#include "peer-io.h"
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#include "trevent.h" /* tr_runInEventThread() */
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#include "tr-utp.h"
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#include "utils.h"
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#ifdef WIN32
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#define EAGAIN WSAEWOULDBLOCK
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#define EINTR WSAEINTR
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#define EINPROGRESS WSAEINPROGRESS
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#define EPIPE WSAECONNRESET
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#endif
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/* The amount of read bufferring that we allow for uTP sockets. */
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#define UTP_READ_BUFFER_SIZE (256 * 1024)
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static size_t
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guessPacketOverhead( size_t d )
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{
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/**
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* http://sd.wareonearth.com/~phil/net/overhead/
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*
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* TCP over Ethernet:
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* Assuming no header compression (e.g. not PPP)
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* Add 20 IPv4 header or 40 IPv6 header (no options)
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* Add 20 TCP header
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* Add 12 bytes optional TCP timestamps
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* Max TCP Payload data rates over ethernet are thus:
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* (1500-40)/(38+1500) = 94.9285 % IPv4, minimal headers
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* (1500-52)/(38+1500) = 94.1482 % IPv4, TCP timestamps
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* (1500-52)/(42+1500) = 93.9040 % 802.1q, IPv4, TCP timestamps
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* (1500-60)/(38+1500) = 93.6281 % IPv6, minimal headers
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* (1500-72)/(38+1500) = 92.8479 % IPv6, TCP timestamps
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* (1500-72)/(42+1500) = 92.6070 % 802.1q, IPv6, ICP timestamps
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*/
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const double assumed_payload_data_rate = 94.0;
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return (unsigned int)( d * ( 100.0 / assumed_payload_data_rate ) - d );
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}
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/**
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***
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**/
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#define dbgmsg( io, ... ) \
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do { \
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if( tr_deepLoggingIsActive( ) ) \
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tr_deepLog( __FILE__, __LINE__, tr_peerIoGetAddrStr( io ), __VA_ARGS__ ); \
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} while( 0 )
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/**
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***
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**/
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struct tr_datatype
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{
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struct tr_datatype * next;
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size_t length;
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bool isPieceData;
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};
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static struct tr_datatype * datatype_pool = NULL;
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static const struct tr_datatype TR_DATATYPE_INIT = { NULL, 0, false };
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static struct tr_datatype *
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datatype_new( void )
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{
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struct tr_datatype * ret;
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if( datatype_pool == NULL )
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ret = tr_new( struct tr_datatype, 1 );
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else {
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ret = datatype_pool;
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datatype_pool = datatype_pool->next;
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}
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*ret = TR_DATATYPE_INIT;
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return ret;
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}
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static void
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datatype_free( struct tr_datatype * datatype )
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{
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datatype->next = datatype_pool;
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datatype_pool = datatype;
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}
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static void
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peer_io_pull_datatype( tr_peerIo * io )
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{
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struct tr_datatype * tmp;
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if(( tmp = io->outbuf_datatypes ))
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{
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io->outbuf_datatypes = tmp->next;
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datatype_free( tmp );
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}
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}
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static void
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peer_io_push_datatype( tr_peerIo * io, struct tr_datatype * datatype )
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{
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struct tr_datatype * tmp;
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if(( tmp = io->outbuf_datatypes )) {
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while( tmp->next != NULL )
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tmp = tmp->next;
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tmp->next = datatype;
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} else {
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io->outbuf_datatypes = datatype;
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}
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}
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/***
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****
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***/
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static void
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didWriteWrapper( tr_peerIo * io, unsigned int bytes_transferred )
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{
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while( bytes_transferred && tr_isPeerIo( io ) )
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{
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struct tr_datatype * next = io->outbuf_datatypes;
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const unsigned int payload = MIN( next->length, bytes_transferred );
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/* For uTP sockets, the overhead is computed in utp_on_overhead. */
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const unsigned int overhead =
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io->socket ? guessPacketOverhead( payload ) : 0;
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const uint64_t now = tr_time_msec( );
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tr_bandwidthUsed( &io->bandwidth, TR_UP, payload, next->isPieceData, now );
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if( overhead > 0 )
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tr_bandwidthUsed( &io->bandwidth, TR_UP, overhead, false, now );
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if( io->didWrite )
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io->didWrite( io, payload, next->isPieceData, io->userData );
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if( tr_isPeerIo( io ) )
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{
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bytes_transferred -= payload;
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next->length -= payload;
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if( !next->length )
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peer_io_pull_datatype( io );
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}
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}
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}
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static void
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canReadWrapper( tr_peerIo * io )
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{
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bool err = 0;
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bool done = 0;
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tr_session * session;
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dbgmsg( io, "canRead" );
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tr_peerIoRef( io );
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session = io->session;
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/* try to consume the input buffer */
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if( io->canRead )
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{
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const uint64_t now = tr_time_msec( );
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tr_sessionLock( session );
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while( !done && !err )
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{
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size_t piece = 0;
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const size_t oldLen = evbuffer_get_length( io->inbuf );
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const int ret = io->canRead( io, io->userData, &piece );
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const size_t used = oldLen - evbuffer_get_length( io->inbuf );
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const unsigned int overhead = guessPacketOverhead( used );
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if( piece || (piece!=used) )
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{
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if( piece )
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tr_bandwidthUsed( &io->bandwidth, TR_DOWN, piece, true, now );
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if( used != piece )
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tr_bandwidthUsed( &io->bandwidth, TR_DOWN, used - piece, false, now );
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}
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if( overhead > 0 )
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tr_bandwidthUsed( &io->bandwidth, TR_UP, overhead, false, now );
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switch( ret )
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{
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case READ_NOW:
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if( evbuffer_get_length( io->inbuf ) )
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continue;
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done = 1;
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break;
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case READ_LATER:
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done = 1;
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break;
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case READ_ERR:
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err = 1;
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break;
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}
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assert( tr_isPeerIo( io ) );
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}
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tr_sessionUnlock( session );
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}
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tr_peerIoUnref( io );
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}
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static void
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event_read_cb( int fd, short event UNUSED, void * vio )
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{
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int res;
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int e;
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tr_peerIo * io = vio;
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/* Limit the input buffer to 256K, so it doesn't grow too large */
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unsigned int howmuch;
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unsigned int curlen;
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const tr_direction dir = TR_DOWN;
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const unsigned int max = 256 * 1024;
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assert( tr_isPeerIo( io ) );
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assert( io->socket >= 0 );
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io->pendingEvents &= ~EV_READ;
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curlen = evbuffer_get_length( io->inbuf );
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howmuch = curlen >= max ? 0 : max - curlen;
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howmuch = tr_bandwidthClamp( &io->bandwidth, TR_DOWN, howmuch );
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dbgmsg( io, "libevent says this peer is ready to read" );
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/* if we don't have any bandwidth left, stop reading */
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if( howmuch < 1 ) {
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tr_peerIoSetEnabled( io, dir, false );
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return;
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}
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EVUTIL_SET_SOCKET_ERROR( 0 );
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res = evbuffer_read( io->inbuf, fd, (int)howmuch );
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e = EVUTIL_SOCKET_ERROR( );
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if( res > 0 )
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{
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tr_peerIoSetEnabled( io, dir, true );
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/* Invoke the user callback - must always be called last */
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canReadWrapper( io );
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}
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else
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{
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char errstr[512];
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short what = BEV_EVENT_READING;
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if( res == 0 ) /* EOF */
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what |= BEV_EVENT_EOF;
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else if( res == -1 ) {
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if( e == EAGAIN || e == EINTR ) {
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tr_peerIoSetEnabled( io, dir, true );
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return;
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}
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what |= BEV_EVENT_ERROR;
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}
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dbgmsg( io, "event_read_cb got an error. res is %d, what is %hd, errno is %d (%s)",
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res, what, e, tr_net_strerror( errstr, sizeof( errstr ), e ) );
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if( io->gotError != NULL )
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io->gotError( io, what, io->userData );
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}
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}
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static int
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tr_evbuffer_write( tr_peerIo * io, int fd, size_t howmuch )
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{
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int e;
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int n;
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char errstr[256];
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EVUTIL_SET_SOCKET_ERROR( 0 );
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n = evbuffer_write_atmost( io->outbuf, fd, howmuch );
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e = EVUTIL_SOCKET_ERROR( );
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dbgmsg( io, "wrote %d to peer (%s)", n, (n==-1?tr_net_strerror(errstr,sizeof(errstr),e):"") );
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return n;
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}
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static void
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event_write_cb( int fd, short event UNUSED, void * vio )
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{
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int res = 0;
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int e;
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short what = BEV_EVENT_WRITING;
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tr_peerIo * io = vio;
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size_t howmuch;
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const tr_direction dir = TR_UP;
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char errstr[1024];
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assert( tr_isPeerIo( io ) );
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assert( io->socket >= 0 );
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io->pendingEvents &= ~EV_WRITE;
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dbgmsg( io, "libevent says this peer is ready to write" );
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/* Write as much as possible, since the socket is non-blocking, write() will
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* return if it can't write any more data without blocking */
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howmuch = tr_bandwidthClamp( &io->bandwidth, dir, evbuffer_get_length( io->outbuf ) );
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/* if we don't have any bandwidth left, stop writing */
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if( howmuch < 1 ) {
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tr_peerIoSetEnabled( io, dir, false );
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return;
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}
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EVUTIL_SET_SOCKET_ERROR( 0 );
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res = tr_evbuffer_write( io, fd, howmuch );
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e = EVUTIL_SOCKET_ERROR( );
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if (res == -1) {
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if (!e || e == EAGAIN || e == EINTR || e == EINPROGRESS)
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goto reschedule;
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/* error case */
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what |= BEV_EVENT_ERROR;
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} else if (res == 0) {
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/* eof case */
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what |= BEV_EVENT_EOF;
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}
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if (res <= 0)
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goto error;
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if( evbuffer_get_length( io->outbuf ) )
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tr_peerIoSetEnabled( io, dir, true );
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didWriteWrapper( io, res );
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return;
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reschedule:
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if( evbuffer_get_length( io->outbuf ) )
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tr_peerIoSetEnabled( io, dir, true );
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return;
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error:
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tr_net_strerror( errstr, sizeof( errstr ), e );
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dbgmsg( io, "event_write_cb got an error. res is %d, what is %hd, errno is %d (%s)", res, what, e, errstr );
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if( io->gotError != NULL )
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io->gotError( io, what, io->userData );
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}
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/**
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***
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**/
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static void
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maybeSetCongestionAlgorithm( int socket, const char * algorithm )
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{
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if( algorithm && *algorithm )
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{
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const int rc = tr_netSetCongestionControl( socket, algorithm );
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if( rc < 0 )
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tr_ninf( "Net", "Can't set congestion control algorithm '%s': %s",
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algorithm, tr_strerror( errno ));
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}
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}
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#ifdef WITH_UTP
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/* UTP callbacks */
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static void
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utp_on_read(void *closure, const unsigned char *buf, size_t buflen)
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{
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int rc;
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tr_peerIo *io = closure;
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assert( tr_isPeerIo( io ) );
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rc = evbuffer_add( io->inbuf, buf, buflen );
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dbgmsg( io, "utp_on_read got %zu bytes", buflen );
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if( rc < 0 ) {
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tr_nerr( "UTP", "On read evbuffer_add" );
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return;
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}
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tr_peerIoSetEnabled( io, TR_DOWN, true );
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canReadWrapper( io );
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}
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static void
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utp_on_write(void *closure, unsigned char *buf, size_t buflen)
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{
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int rc;
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tr_peerIo *io = closure;
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assert( tr_isPeerIo( io ) );
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rc = evbuffer_remove( io->outbuf, buf, buflen );
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dbgmsg( io, "utp_on_write sending %zu bytes... evbuffer_remove returned %d", buflen, rc );
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assert( rc == (int)buflen ); /* if this fails, we've corrupted our bookkeeping somewhere */
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if( rc < (long)buflen ) {
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tr_nerr( "UTP", "Short write: %d < %ld", rc, (long)buflen);
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}
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didWriteWrapper( io, buflen );
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}
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static size_t
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utp_get_rb_size(void *closure)
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{
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size_t bytes;
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tr_peerIo *io = closure;
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assert( tr_isPeerIo( io ) );
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bytes = tr_bandwidthClamp( &io->bandwidth, TR_DOWN, UTP_READ_BUFFER_SIZE );
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dbgmsg( io, "utp_get_rb_size is saying it's ready to read %zu bytes", bytes );
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return UTP_READ_BUFFER_SIZE - bytes;
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}
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static void
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utp_on_state_change(void *closure, int state)
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{
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tr_peerIo *io = closure;
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assert( tr_isPeerIo( io ) );
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if( state == UTP_STATE_CONNECT ) {
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dbgmsg( io, "utp_on_state_change -- changed to connected" );
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io->utpSupported = true;
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} else if( state == UTP_STATE_WRITABLE ) {
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dbgmsg( io, "utp_on_state_change -- changed to writable" );
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} else if( state == UTP_STATE_EOF ) {
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if( io->gotError )
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io->gotError( io, BEV_EVENT_EOF, io->userData );
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} else if( state == UTP_STATE_DESTROYING ) {
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tr_nerr( "UTP", "Impossible state UTP_STATE_DESTROYING" );
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return;
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} else {
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tr_nerr( "UTP", "Unknown state %d", state );
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}
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}
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|
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static void
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utp_on_error(void *closure, int errcode)
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{
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tr_peerIo *io = closure;
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assert( tr_isPeerIo( io ) );
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dbgmsg( io, "utp_on_error -- errcode is %d", errcode );
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if( io->gotError ) {
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errno = errcode;
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io->gotError( io, BEV_EVENT_ERROR, io->userData );
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}
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}
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static void
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utp_on_overhead(void *closure, bool send, size_t count, int type UNUSED)
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{
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tr_peerIo *io = closure;
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assert( tr_isPeerIo( io ) );
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dbgmsg( io, "utp_on_overhead -- count is %zu", count );
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tr_bandwidthUsed( &io->bandwidth, send ? TR_UP : TR_DOWN,
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count, false, tr_time_msec() );
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}
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|
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static struct UTPFunctionTable utp_function_table = {
|
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.on_read = utp_on_read,
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.on_write = utp_on_write,
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.get_rb_size = utp_get_rb_size,
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.on_state = utp_on_state_change,
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.on_error = utp_on_error,
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.on_overhead = utp_on_overhead
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};
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/* Dummy UTP callbacks. */
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/* We switch a UTP socket to use these after the associated peerIo has been
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destroyed -- see io_dtor. */
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|
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static void
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dummy_read( void * closure UNUSED, const unsigned char *buf UNUSED, size_t buflen UNUSED )
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{
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/* This cannot happen, as far as I'm aware. */
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tr_nerr( "UTP", "On_read called on closed socket" );
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|
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}
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|
|
static void
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dummy_write(void * closure UNUSED, unsigned char *buf, size_t buflen)
|
|
{
|
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/* This can very well happen if we've shut down a peer connection that
|
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had unflushed buffers. Complain and send zeroes. */
|
|
tr_ndbg( "UTP", "On_write called on closed socket" );
|
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memset( buf, 0, buflen );
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}
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|
|
|
static size_t
|
|
dummy_get_rb_size( void * closure UNUSED )
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
dummy_on_state_change(void * closure UNUSED, int state UNUSED )
|
|
{
|
|
return;
|
|
}
|
|
|
|
static void
|
|
dummy_on_error( void * closure UNUSED, int errcode UNUSED )
|
|
{
|
|
return;
|
|
}
|
|
|
|
static void
|
|
dummy_on_overhead( void *closure UNUSED, bool send UNUSED, size_t count UNUSED, int type UNUSED )
|
|
{
|
|
return;
|
|
}
|
|
|
|
static struct UTPFunctionTable dummy_utp_function_table = {
|
|
.on_read = dummy_read,
|
|
.on_write = dummy_write,
|
|
.get_rb_size = dummy_get_rb_size,
|
|
.on_state = dummy_on_state_change,
|
|
.on_error = dummy_on_error,
|
|
.on_overhead = dummy_on_overhead
|
|
};
|
|
|
|
#endif /* #ifdef WITH_UTP */
|
|
|
|
static tr_peerIo*
|
|
tr_peerIoNew( tr_session * session,
|
|
tr_bandwidth * parent,
|
|
const tr_address * addr,
|
|
tr_port port,
|
|
const uint8_t * torrentHash,
|
|
bool isIncoming,
|
|
bool isSeed,
|
|
int socket,
|
|
struct UTPSocket * utp_socket)
|
|
{
|
|
tr_peerIo * io;
|
|
|
|
assert( session != NULL );
|
|
assert( session->events != NULL );
|
|
assert( tr_isBool( isIncoming ) );
|
|
assert( tr_isBool( isSeed ) );
|
|
assert( tr_amInEventThread( session ) );
|
|
assert( (socket < 0) == (utp_socket != NULL) );
|
|
#ifndef WITH_UTP
|
|
assert( socket >= 0 );
|
|
#endif
|
|
|
|
if( socket >= 0 ) {
|
|
tr_netSetTOS( socket, session->peerSocketTOS );
|
|
maybeSetCongestionAlgorithm( socket, session->peer_congestion_algorithm );
|
|
}
|
|
|
|
io = tr_new0( tr_peerIo, 1 );
|
|
io->magicNumber = PEER_IO_MAGIC_NUMBER;
|
|
io->refCount = 1;
|
|
tr_cryptoConstruct( &io->crypto, torrentHash, isIncoming );
|
|
io->session = session;
|
|
io->addr = *addr;
|
|
io->isSeed = isSeed;
|
|
io->port = port;
|
|
io->socket = socket;
|
|
io->utp_socket = utp_socket;
|
|
io->isIncoming = isIncoming != 0;
|
|
io->timeCreated = tr_time( );
|
|
io->inbuf = evbuffer_new( );
|
|
io->outbuf = evbuffer_new( );
|
|
tr_bandwidthConstruct( &io->bandwidth, session, parent );
|
|
tr_bandwidthSetPeer( &io->bandwidth, io );
|
|
dbgmsg( io, "bandwidth is %p; its parent is %p", &io->bandwidth, parent );
|
|
dbgmsg( io, "socket is %d, utp_socket is %p", socket, utp_socket );
|
|
|
|
if( io->socket >= 0 ) {
|
|
io->event_read = event_new( session->event_base,
|
|
io->socket, EV_READ, event_read_cb, io );
|
|
io->event_write = event_new( session->event_base,
|
|
io->socket, EV_WRITE, event_write_cb, io );
|
|
}
|
|
#ifdef WITH_UTP
|
|
else {
|
|
UTP_SetSockopt( utp_socket, SO_RCVBUF, UTP_READ_BUFFER_SIZE );
|
|
dbgmsg( io, "%s", "calling UTP_SetCallbacks &utp_function_table" );
|
|
UTP_SetCallbacks( utp_socket,
|
|
&utp_function_table,
|
|
io );
|
|
if( !isIncoming ) {
|
|
dbgmsg( io, "%s", "calling UTP_Connect" );
|
|
UTP_Connect( utp_socket );
|
|
}
|
|
}
|
|
#endif
|
|
|
|
return io;
|
|
}
|
|
|
|
tr_peerIo*
|
|
tr_peerIoNewIncoming( tr_session * session,
|
|
tr_bandwidth * parent,
|
|
const tr_address * addr,
|
|
tr_port port,
|
|
int fd,
|
|
struct UTPSocket * utp_socket )
|
|
{
|
|
assert( session );
|
|
assert( tr_address_is_valid( addr ) );
|
|
|
|
return tr_peerIoNew( session, parent, addr, port, NULL, true, false,
|
|
fd, utp_socket );
|
|
}
|
|
|
|
tr_peerIo*
|
|
tr_peerIoNewOutgoing( tr_session * session,
|
|
tr_bandwidth * parent,
|
|
const tr_address * addr,
|
|
tr_port port,
|
|
const uint8_t * torrentHash,
|
|
bool isSeed,
|
|
bool utp )
|
|
{
|
|
int fd = -1;
|
|
struct UTPSocket * utp_socket = NULL;
|
|
|
|
assert( session );
|
|
assert( tr_address_is_valid( addr ) );
|
|
assert( torrentHash );
|
|
|
|
if( utp )
|
|
utp_socket = tr_netOpenPeerUTPSocket( session, addr, port, isSeed );
|
|
|
|
if( !utp_socket ) {
|
|
fd = tr_netOpenPeerSocket( session, addr, port, isSeed );
|
|
dbgmsg( NULL, "tr_netOpenPeerSocket returned fd %d", fd );
|
|
}
|
|
|
|
if( fd < 0 && utp_socket == NULL )
|
|
return NULL;
|
|
|
|
return tr_peerIoNew( session, parent, addr, port,
|
|
torrentHash, false, isSeed, fd, utp_socket );
|
|
}
|
|
|
|
/***
|
|
****
|
|
***/
|
|
|
|
static void
|
|
event_enable( tr_peerIo * io, short event )
|
|
{
|
|
assert( tr_amInEventThread( io->session ) );
|
|
assert( io->session != NULL );
|
|
assert( io->session->events != NULL );
|
|
|
|
if( io->socket < 0 )
|
|
return;
|
|
|
|
assert( io->session->events != NULL );
|
|
assert( event_initialized( io->event_read ) );
|
|
assert( event_initialized( io->event_write ) );
|
|
|
|
if( ( event & EV_READ ) && ! ( io->pendingEvents & EV_READ ) )
|
|
{
|
|
dbgmsg( io, "enabling libevent ready-to-read polling" );
|
|
event_add( io->event_read, NULL );
|
|
io->pendingEvents |= EV_READ;
|
|
}
|
|
|
|
if( ( event & EV_WRITE ) && ! ( io->pendingEvents & EV_WRITE ) )
|
|
{
|
|
dbgmsg( io, "enabling libevent ready-to-write polling" );
|
|
event_add( io->event_write, NULL );
|
|
io->pendingEvents |= EV_WRITE;
|
|
}
|
|
}
|
|
|
|
static void
|
|
event_disable( struct tr_peerIo * io, short event )
|
|
{
|
|
assert( tr_amInEventThread( io->session ) );
|
|
assert( io->session != NULL );
|
|
|
|
if( io->socket < 0 )
|
|
return;
|
|
|
|
assert( io->session->events != NULL );
|
|
assert( event_initialized( io->event_read ) );
|
|
assert( event_initialized( io->event_write ) );
|
|
|
|
if( ( event & EV_READ ) && ( io->pendingEvents & EV_READ ) )
|
|
{
|
|
dbgmsg( io, "disabling libevent ready-to-read polling" );
|
|
event_del( io->event_read );
|
|
io->pendingEvents &= ~EV_READ;
|
|
}
|
|
|
|
if( ( event & EV_WRITE ) && ( io->pendingEvents & EV_WRITE ) )
|
|
{
|
|
dbgmsg( io, "disabling libevent ready-to-write polling" );
|
|
event_del( io->event_write );
|
|
io->pendingEvents &= ~EV_WRITE;
|
|
}
|
|
}
|
|
|
|
void
|
|
tr_peerIoSetEnabled( tr_peerIo * io,
|
|
tr_direction dir,
|
|
bool isEnabled )
|
|
{
|
|
const short event = dir == TR_UP ? EV_WRITE : EV_READ;
|
|
|
|
assert( tr_isPeerIo( io ) );
|
|
assert( tr_isDirection( dir ) );
|
|
assert( tr_amInEventThread( io->session ) );
|
|
assert( io->session->events != NULL );
|
|
|
|
if( isEnabled )
|
|
event_enable( io, event );
|
|
else
|
|
event_disable( io, event );
|
|
}
|
|
|
|
/***
|
|
****
|
|
***/
|
|
static void
|
|
io_close_socket( tr_peerIo * io )
|
|
{
|
|
if( io->socket >= 0 ) {
|
|
tr_netClose( io->session, io->socket );
|
|
io->socket = -1;
|
|
}
|
|
|
|
if( io->event_read != NULL) {
|
|
event_free( io->event_read );
|
|
io->event_read = NULL;
|
|
}
|
|
|
|
if( io->event_write != NULL) {
|
|
event_free( io->event_write );
|
|
io->event_write = NULL;
|
|
}
|
|
|
|
#ifdef WITH_UTP
|
|
if( io->utp_socket ) {
|
|
UTP_SetCallbacks( io->utp_socket,
|
|
&dummy_utp_function_table,
|
|
NULL );
|
|
UTP_Close( io->utp_socket );
|
|
|
|
io->utp_socket = NULL;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static void
|
|
io_dtor( void * vio )
|
|
{
|
|
tr_peerIo * io = vio;
|
|
|
|
assert( tr_isPeerIo( io ) );
|
|
assert( tr_amInEventThread( io->session ) );
|
|
assert( io->session->events != NULL );
|
|
|
|
dbgmsg( io, "in tr_peerIo destructor" );
|
|
event_disable( io, EV_READ | EV_WRITE );
|
|
tr_bandwidthDestruct( &io->bandwidth );
|
|
evbuffer_free( io->outbuf );
|
|
evbuffer_free( io->inbuf );
|
|
io_close_socket( io );
|
|
tr_cryptoDestruct( &io->crypto );
|
|
|
|
while( io->outbuf_datatypes != NULL )
|
|
peer_io_pull_datatype( io );
|
|
|
|
memset( io, ~0, sizeof( tr_peerIo ) );
|
|
tr_free( io );
|
|
}
|
|
|
|
static void
|
|
tr_peerIoFree( tr_peerIo * io )
|
|
{
|
|
if( io )
|
|
{
|
|
dbgmsg( io, "in tr_peerIoFree" );
|
|
io->canRead = NULL;
|
|
io->didWrite = NULL;
|
|
io->gotError = NULL;
|
|
tr_runInEventThread( io->session, io_dtor, io );
|
|
}
|
|
}
|
|
|
|
void
|
|
tr_peerIoRefImpl( const char * file, int line, tr_peerIo * io )
|
|
{
|
|
assert( tr_isPeerIo( io ) );
|
|
|
|
dbgmsg( io, "%s:%d is incrementing the IO's refcount from %d to %d",
|
|
file, line, io->refCount, io->refCount+1 );
|
|
|
|
++io->refCount;
|
|
}
|
|
|
|
void
|
|
tr_peerIoUnrefImpl( const char * file, int line, tr_peerIo * io )
|
|
{
|
|
assert( tr_isPeerIo( io ) );
|
|
|
|
dbgmsg( io, "%s:%d is decrementing the IO's refcount from %d to %d",
|
|
file, line, io->refCount, io->refCount-1 );
|
|
|
|
if( !--io->refCount )
|
|
tr_peerIoFree( io );
|
|
}
|
|
|
|
const tr_address*
|
|
tr_peerIoGetAddress( const tr_peerIo * io, tr_port * port )
|
|
{
|
|
assert( tr_isPeerIo( io ) );
|
|
|
|
if( port )
|
|
*port = io->port;
|
|
|
|
return &io->addr;
|
|
}
|
|
|
|
const char*
|
|
tr_peerIoAddrStr( const tr_address * addr, tr_port port )
|
|
{
|
|
static char buf[512];
|
|
tr_snprintf( buf, sizeof( buf ), "[%s]:%u", tr_address_to_string( addr ), ntohs( port ) );
|
|
return buf;
|
|
}
|
|
|
|
const char* tr_peerIoGetAddrStr( const tr_peerIo * io )
|
|
{
|
|
return tr_isPeerIo( io ) ? tr_peerIoAddrStr( &io->addr, io->port ) : "error";
|
|
}
|
|
|
|
void
|
|
tr_peerIoSetIOFuncs( tr_peerIo * io,
|
|
tr_can_read_cb readcb,
|
|
tr_did_write_cb writecb,
|
|
tr_net_error_cb errcb,
|
|
void * userData )
|
|
{
|
|
io->canRead = readcb;
|
|
io->didWrite = writecb;
|
|
io->gotError = errcb;
|
|
io->userData = userData;
|
|
}
|
|
|
|
void
|
|
tr_peerIoClear( tr_peerIo * io )
|
|
{
|
|
tr_peerIoSetIOFuncs( io, NULL, NULL, NULL, NULL );
|
|
tr_peerIoSetEnabled( io, TR_UP, false );
|
|
tr_peerIoSetEnabled( io, TR_DOWN, false );
|
|
}
|
|
|
|
int
|
|
tr_peerIoReconnect( tr_peerIo * io )
|
|
{
|
|
short int pendingEvents;
|
|
tr_session * session;
|
|
|
|
assert( tr_isPeerIo( io ) );
|
|
assert( !tr_peerIoIsIncoming( io ) );
|
|
|
|
session = tr_peerIoGetSession( io );
|
|
|
|
pendingEvents = io->pendingEvents;
|
|
event_disable( io, EV_READ | EV_WRITE );
|
|
|
|
io_close_socket( io );
|
|
|
|
io->socket = tr_netOpenPeerSocket( session, &io->addr, io->port, io->isSeed );
|
|
io->event_read = event_new( session->event_base, io->socket, EV_READ, event_read_cb, io );
|
|
io->event_write = event_new( session->event_base, io->socket, EV_WRITE, event_write_cb, io );
|
|
|
|
if( io->socket >= 0 )
|
|
{
|
|
event_enable( io, pendingEvents );
|
|
tr_netSetTOS( io->socket, session->peerSocketTOS );
|
|
maybeSetCongestionAlgorithm( io->socket, session->peer_congestion_algorithm );
|
|
return 0;
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
/**
|
|
***
|
|
**/
|
|
|
|
void
|
|
tr_peerIoSetTorrentHash( tr_peerIo * io,
|
|
const uint8_t * hash )
|
|
{
|
|
assert( tr_isPeerIo( io ) );
|
|
|
|
tr_cryptoSetTorrentHash( &io->crypto, hash );
|
|
}
|
|
|
|
const uint8_t*
|
|
tr_peerIoGetTorrentHash( tr_peerIo * io )
|
|
{
|
|
assert( tr_isPeerIo( io ) );
|
|
|
|
return tr_cryptoGetTorrentHash( &io->crypto );
|
|
}
|
|
|
|
int
|
|
tr_peerIoHasTorrentHash( const tr_peerIo * io )
|
|
{
|
|
assert( tr_isPeerIo( io ) );
|
|
|
|
return tr_cryptoHasTorrentHash( &io->crypto );
|
|
}
|
|
|
|
/**
|
|
***
|
|
**/
|
|
|
|
void
|
|
tr_peerIoSetPeersId( tr_peerIo * io, const uint8_t * peer_id )
|
|
{
|
|
assert( tr_isPeerIo( io ) );
|
|
|
|
if( ( io->peerIdIsSet = peer_id != NULL ) )
|
|
memcpy( io->peerId, peer_id, 20 );
|
|
else
|
|
memset( io->peerId, 0, 20 );
|
|
}
|
|
|
|
/**
|
|
***
|
|
**/
|
|
|
|
static unsigned int
|
|
getDesiredOutputBufferSize( const tr_peerIo * io, uint64_t now )
|
|
{
|
|
/* this is all kind of arbitrary, but what seems to work well is
|
|
* being large enough to hold the next 20 seconds' worth of input,
|
|
* or a few blocks, whichever is bigger.
|
|
* It's okay to tweak this as needed */
|
|
const unsigned int currentSpeed_Bps = tr_bandwidthGetPieceSpeed_Bps( &io->bandwidth, now, TR_UP );
|
|
const unsigned int period = 15u; /* arbitrary */
|
|
/* the 3 is arbitrary; the .5 is to leave room for messages */
|
|
static const unsigned int ceiling = (unsigned int)( MAX_BLOCK_SIZE * 3.5 );
|
|
return MAX( ceiling, currentSpeed_Bps*period );
|
|
}
|
|
|
|
size_t
|
|
tr_peerIoGetWriteBufferSpace( const tr_peerIo * io, uint64_t now )
|
|
{
|
|
const size_t desiredLen = getDesiredOutputBufferSize( io, now );
|
|
const size_t currentLen = evbuffer_get_length( io->outbuf );
|
|
size_t freeSpace = 0;
|
|
|
|
if( desiredLen > currentLen )
|
|
freeSpace = desiredLen - currentLen;
|
|
|
|
return freeSpace;
|
|
}
|
|
|
|
/**
|
|
***
|
|
**/
|
|
|
|
void
|
|
tr_peerIoSetEncryption( tr_peerIo * io, tr_encryption_type encryption_type )
|
|
{
|
|
assert( tr_isPeerIo( io ) );
|
|
assert( encryption_type == PEER_ENCRYPTION_NONE
|
|
|| encryption_type == PEER_ENCRYPTION_RC4 );
|
|
|
|
io->encryption_type = encryption_type;
|
|
}
|
|
|
|
/**
|
|
***
|
|
**/
|
|
|
|
static void
|
|
addDatatype( tr_peerIo * io, size_t byteCount, bool isPieceData )
|
|
{
|
|
struct tr_datatype * d;
|
|
d = datatype_new( );
|
|
d->isPieceData = isPieceData != 0;
|
|
d->length = byteCount;
|
|
peer_io_push_datatype( io, d );
|
|
}
|
|
|
|
static void
|
|
maybeEncryptBuffer( tr_peerIo * io, struct evbuffer * buf )
|
|
{
|
|
if( io->encryption_type == PEER_ENCRYPTION_RC4 )
|
|
{
|
|
struct evbuffer_ptr pos;
|
|
struct evbuffer_iovec iovec;
|
|
evbuffer_ptr_set( buf, &pos, 0, EVBUFFER_PTR_SET );
|
|
do {
|
|
evbuffer_peek( buf, -1, &pos, &iovec, 1 );
|
|
tr_cryptoEncrypt( &io->crypto, iovec.iov_len, iovec.iov_base, iovec.iov_base );
|
|
} while( !evbuffer_ptr_set( buf, &pos, iovec.iov_len, EVBUFFER_PTR_ADD ) );
|
|
}
|
|
}
|
|
|
|
void
|
|
tr_peerIoWriteBuf( tr_peerIo * io, struct evbuffer * buf, bool isPieceData )
|
|
{
|
|
const size_t byteCount = evbuffer_get_length( buf );
|
|
maybeEncryptBuffer( io, buf );
|
|
evbuffer_add_buffer( io->outbuf, buf );
|
|
addDatatype( io, byteCount, isPieceData );
|
|
}
|
|
|
|
void
|
|
tr_peerIoWriteBytes( tr_peerIo * io, const void * bytes, size_t byteCount, bool isPieceData )
|
|
{
|
|
struct evbuffer_iovec iovec;
|
|
evbuffer_reserve_space( io->outbuf, byteCount, &iovec, 1 );
|
|
|
|
iovec.iov_len = byteCount;
|
|
if( io->encryption_type == PEER_ENCRYPTION_RC4 )
|
|
tr_cryptoEncrypt( &io->crypto, iovec.iov_len, bytes, iovec.iov_base );
|
|
else
|
|
memcpy( iovec.iov_base, bytes, iovec.iov_len );
|
|
evbuffer_commit_space( io->outbuf, &iovec, 1 );
|
|
|
|
addDatatype( io, byteCount, isPieceData );
|
|
}
|
|
|
|
/***
|
|
****
|
|
***/
|
|
|
|
void
|
|
evbuffer_add_uint8( struct evbuffer * outbuf, uint8_t byte )
|
|
{
|
|
evbuffer_add( outbuf, &byte, 1 );
|
|
}
|
|
|
|
void
|
|
evbuffer_add_uint16( struct evbuffer * outbuf, uint16_t addme_hs )
|
|
{
|
|
const uint16_t ns = htons( addme_hs );
|
|
evbuffer_add( outbuf, &ns, sizeof( ns ) );
|
|
}
|
|
|
|
void
|
|
evbuffer_add_uint32( struct evbuffer * outbuf, uint32_t addme_hl )
|
|
{
|
|
const uint32_t nl = htonl( addme_hl );
|
|
evbuffer_add( outbuf, &nl, sizeof( nl ) );
|
|
}
|
|
|
|
void
|
|
evbuffer_add_uint64( struct evbuffer * outbuf, uint64_t addme_hll )
|
|
{
|
|
const uint64_t nll = tr_htonll( addme_hll );
|
|
evbuffer_add( outbuf, &nll, sizeof( nll ) );
|
|
}
|
|
|
|
/***
|
|
****
|
|
***/
|
|
|
|
void
|
|
tr_peerIoReadBytesToBuf( tr_peerIo * io, struct evbuffer * inbuf, struct evbuffer * outbuf, size_t byteCount )
|
|
{
|
|
struct evbuffer * tmp;
|
|
const size_t old_length = evbuffer_get_length( outbuf );
|
|
|
|
assert( tr_isPeerIo( io ) );
|
|
assert( evbuffer_get_length( inbuf ) >= byteCount );
|
|
|
|
/* append it to outbuf */
|
|
tmp = evbuffer_new( );
|
|
evbuffer_remove_buffer( inbuf, tmp, byteCount );
|
|
evbuffer_add_buffer( outbuf, tmp );
|
|
evbuffer_free( tmp );
|
|
|
|
/* decrypt if needed */
|
|
if( io->encryption_type == PEER_ENCRYPTION_RC4 ) {
|
|
struct evbuffer_ptr pos;
|
|
struct evbuffer_iovec iovec;
|
|
evbuffer_ptr_set( outbuf, &pos, old_length, EVBUFFER_PTR_SET );
|
|
do {
|
|
evbuffer_peek( outbuf, byteCount, &pos, &iovec, 1 );
|
|
tr_cryptoDecrypt( &io->crypto, iovec.iov_len, iovec.iov_base, iovec.iov_base );
|
|
byteCount -= iovec.iov_len;
|
|
} while( !evbuffer_ptr_set( outbuf, &pos, iovec.iov_len, EVBUFFER_PTR_ADD ) );
|
|
}
|
|
}
|
|
|
|
void
|
|
tr_peerIoReadBytes( tr_peerIo * io, struct evbuffer * inbuf, void * bytes, size_t byteCount )
|
|
{
|
|
assert( tr_isPeerIo( io ) );
|
|
assert( evbuffer_get_length( inbuf ) >= byteCount );
|
|
|
|
switch( io->encryption_type )
|
|
{
|
|
case PEER_ENCRYPTION_NONE:
|
|
evbuffer_remove( inbuf, bytes, byteCount );
|
|
break;
|
|
|
|
case PEER_ENCRYPTION_RC4:
|
|
evbuffer_remove( inbuf, bytes, byteCount );
|
|
tr_cryptoDecrypt( &io->crypto, byteCount, bytes, bytes );
|
|
break;
|
|
|
|
default:
|
|
assert( 0 );
|
|
}
|
|
}
|
|
|
|
void
|
|
tr_peerIoReadUint16( tr_peerIo * io,
|
|
struct evbuffer * inbuf,
|
|
uint16_t * setme )
|
|
{
|
|
uint16_t tmp;
|
|
tr_peerIoReadBytes( io, inbuf, &tmp, sizeof( uint16_t ) );
|
|
*setme = ntohs( tmp );
|
|
}
|
|
|
|
void tr_peerIoReadUint32( tr_peerIo * io,
|
|
struct evbuffer * inbuf,
|
|
uint32_t * setme )
|
|
{
|
|
uint32_t tmp;
|
|
tr_peerIoReadBytes( io, inbuf, &tmp, sizeof( uint32_t ) );
|
|
*setme = ntohl( tmp );
|
|
}
|
|
|
|
void
|
|
tr_peerIoDrain( tr_peerIo * io,
|
|
struct evbuffer * inbuf,
|
|
size_t byteCount )
|
|
{
|
|
char buf[4096];
|
|
const size_t buflen = sizeof( buf );
|
|
|
|
while( byteCount > 0 )
|
|
{
|
|
const size_t thisPass = MIN( byteCount, buflen );
|
|
tr_peerIoReadBytes( io, inbuf, buf, thisPass );
|
|
byteCount -= thisPass;
|
|
}
|
|
}
|
|
|
|
/***
|
|
****
|
|
***/
|
|
|
|
static int
|
|
tr_peerIoTryRead( tr_peerIo * io, size_t howmuch )
|
|
{
|
|
int res = 0;
|
|
|
|
if(( howmuch = tr_bandwidthClamp( &io->bandwidth, TR_DOWN, howmuch )))
|
|
{
|
|
if( io->utp_socket != NULL ) /* utp peer connection */
|
|
{
|
|
/* UTP_RBDrained notifies libutp that your read buffer is emtpy.
|
|
* It opens up the congestion window by sending an ACK (soonish)
|
|
* if one was not going to be sent. */
|
|
if( evbuffer_get_length( io->inbuf ) == 0 )
|
|
UTP_RBDrained( io->utp_socket );
|
|
}
|
|
else /* tcp peer connection */
|
|
{
|
|
int e;
|
|
|
|
EVUTIL_SET_SOCKET_ERROR( 0 );
|
|
res = evbuffer_read( io->inbuf, io->socket, (int)howmuch );
|
|
e = EVUTIL_SOCKET_ERROR( );
|
|
|
|
dbgmsg( io, "read %d from peer (%s)", res, (res==-1?tr_strerror(e):"") );
|
|
|
|
if( evbuffer_get_length( io->inbuf ) )
|
|
canReadWrapper( io );
|
|
|
|
if( ( res <= 0 ) && ( io->gotError ) && ( e != EAGAIN ) && ( e != EINTR ) && ( e != EINPROGRESS ) )
|
|
{
|
|
char errstr[512];
|
|
short what = BEV_EVENT_READING | BEV_EVENT_ERROR;
|
|
if( res == 0 )
|
|
what |= BEV_EVENT_EOF;
|
|
dbgmsg( io, "tr_peerIoTryRead got an error. res is %d, what is %hd, errno is %d (%s)",
|
|
res, what, e, tr_net_strerror( errstr, sizeof( errstr ), e ) );
|
|
io->gotError( io, what, io->userData );
|
|
}
|
|
}
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
static int
|
|
tr_peerIoTryWrite( tr_peerIo * io, size_t howmuch )
|
|
{
|
|
int n = 0;
|
|
const size_t old_len = evbuffer_get_length( io->outbuf );
|
|
dbgmsg( io, "in tr_peerIoTryWrite %zu", howmuch );
|
|
|
|
if( howmuch > old_len )
|
|
howmuch = old_len;
|
|
|
|
if(( howmuch = tr_bandwidthClamp( &io->bandwidth, TR_UP, howmuch )))
|
|
{
|
|
if( io->utp_socket != NULL ) /* utp peer connection */
|
|
{
|
|
const size_t old_len = evbuffer_get_length( io->outbuf );
|
|
UTP_Write( io->utp_socket, howmuch );
|
|
n = old_len - evbuffer_get_length( io->outbuf );
|
|
}
|
|
else
|
|
{
|
|
int e;
|
|
|
|
EVUTIL_SET_SOCKET_ERROR( 0 );
|
|
n = tr_evbuffer_write( io, io->socket, howmuch );
|
|
e = EVUTIL_SOCKET_ERROR( );
|
|
|
|
if( n > 0 )
|
|
didWriteWrapper( io, n );
|
|
|
|
if( ( n < 0 ) && ( io->gotError ) && e && ( e != EPIPE ) && ( e != EAGAIN ) && ( e != EINTR ) && ( e != EINPROGRESS ) )
|
|
{
|
|
char errstr[512];
|
|
const short what = BEV_EVENT_WRITING | BEV_EVENT_ERROR;
|
|
|
|
dbgmsg( io, "tr_peerIoTryWrite got an error. res is %d, what is %hd, errno is %d (%s)",
|
|
n, what, e, tr_net_strerror( errstr, sizeof( errstr ), e ) );
|
|
|
|
if( io->gotError != NULL )
|
|
io->gotError( io, what, io->userData );
|
|
}
|
|
}
|
|
}
|
|
|
|
return n;
|
|
}
|
|
|
|
int
|
|
tr_peerIoFlush( tr_peerIo * io, tr_direction dir, size_t limit )
|
|
{
|
|
int bytesUsed = 0;
|
|
|
|
assert( tr_isPeerIo( io ) );
|
|
assert( tr_isDirection( dir ) );
|
|
|
|
if( dir == TR_DOWN )
|
|
bytesUsed = tr_peerIoTryRead( io, limit );
|
|
else
|
|
bytesUsed = tr_peerIoTryWrite( io, limit );
|
|
|
|
dbgmsg( io, "flushing peer-io, direction %d, limit %zu, bytesUsed %d", (int)dir, limit, bytesUsed );
|
|
return bytesUsed;
|
|
}
|
|
|
|
int
|
|
tr_peerIoFlushOutgoingProtocolMsgs( tr_peerIo * io )
|
|
{
|
|
size_t byteCount = 0;
|
|
const struct tr_datatype * it;
|
|
|
|
/* count up how many bytes are used by non-piece-data messages
|
|
at the front of our outbound queue */
|
|
for( it=io->outbuf_datatypes; it!=NULL; it=it->next )
|
|
if( it->isPieceData )
|
|
break;
|
|
else
|
|
byteCount += it->length;
|
|
|
|
return tr_peerIoFlush( io, TR_UP, byteCount );
|
|
}
|