972 lines
25 KiB
C
972 lines
25 KiB
C
/*
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* This file Copyright (C) 2007-2010 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 <limits.h> /* INT_MAX */
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#include <string.h>
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#include <stdio.h>
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#include <unistd.h>
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#ifdef WIN32
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#include <winsock2.h>
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#else
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#include <arpa/inet.h> /* inet_ntoa */
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#endif
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#include <event.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 "list.h"
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#include "net.h"
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#include "peer-io.h"
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#include "trevent.h" /* tr_runInEventThread() */
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#include "utils.h"
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#define MAGIC_NUMBER 206745
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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 (size_t)( 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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struct tr_datatype
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{
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tr_bool isPieceData;
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size_t length;
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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, size_t 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->data;
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const size_t payload = MIN( next->length, bytes_transferred );
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const size_t overhead = guessPacketOverhead( payload );
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tr_bandwidthUsed( &io->bandwidth, TR_UP, payload, next->isPieceData );
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if( overhead > 0 )
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tr_bandwidthUsed( &io->bandwidth, TR_UP, overhead, FALSE );
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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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tr_list_pop_front( &io->outbuf_datatypes );
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tr_free( next );
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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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canReadWrapper( tr_peerIo * io )
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{
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tr_bool err = 0;
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tr_bool done = 0;
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tr_session * session;
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dbgmsg( io, "canRead" );
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assert( tr_isPeerIo( io ) );
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assert( tr_isSession( io->session ) );
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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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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_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_LENGTH( io->inbuf );
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assert( tr_isPeerIo( io ) );
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if( piece )
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tr_bandwidthUsed( &io->bandwidth, TR_DOWN, piece, TRUE );
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if( used != piece )
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tr_bandwidthUsed( &io->bandwidth, TR_DOWN, used - piece, FALSE );
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switch( ret )
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{
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case READ_NOW:
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if( EVBUFFER_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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/* keep the iobuf's excess capacity from growing too large */
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if( EVBUFFER_LENGTH( io->inbuf ) == 0 ) {
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evbuffer_free( io->inbuf );
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io->inbuf = evbuffer_new( );
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}
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assert( tr_isPeerIo( io ) );
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tr_peerIoUnref( io );
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}
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tr_bool
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tr_isPeerIo( const tr_peerIo * io )
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{
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return ( io != NULL )
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&& ( io->magicNumber == MAGIC_NUMBER )
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&& ( io->refCount >= 0 )
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&& ( tr_isBandwidth( &io->bandwidth ) )
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&& ( tr_isAddress( &io->addr ) );
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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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size_t howmuch;
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const tr_direction dir = TR_DOWN;
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const size_t max = 256 * 1024;
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size_t curlen;
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assert( tr_isPeerIo( io ) );
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io->hasFinishedConnecting = TRUE;
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io->pendingEvents &= ~EV_READ;
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curlen = EVBUFFER_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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errno = 0;
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res = evbuffer_read( io->inbuf, fd, howmuch );
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e = errno;
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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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short what = EVBUFFER_READ;
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if( res == 0 ) /* EOF */
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what |= EVBUFFER_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 |= EVBUFFER_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)", res, what, e, strerror( 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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struct evbuffer * buffer = io->outbuf;
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howmuch = MIN( EVBUFFER_LENGTH( buffer ), howmuch );
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errno = 0;
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#ifdef WIN32
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n = (int) send(fd, buffer->buffer, howmuch, 0 );
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#else
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n = (int) write(fd, buffer->buffer, howmuch );
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#endif
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e = errno;
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dbgmsg( io, "wrote %d to peer (%s)", n, (n==-1?strerror(e):"") );
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if( n > 0 )
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evbuffer_drain( buffer, n );
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/* keep the iobuf's excess capacity from growing too large */
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if( EVBUFFER_LENGTH( io->outbuf ) == 0 ) {
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evbuffer_free( io->outbuf );
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io->outbuf = evbuffer_new( );
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}
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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 = EVBUFFER_WRITE;
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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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assert( tr_isPeerIo( io ) );
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io->hasFinishedConnecting = TRUE;
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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_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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errno = 0;
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res = tr_evbuffer_write( io, fd, howmuch );
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e = errno;
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if (res == -1) {
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#ifndef WIN32
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/*todo. evbuffer uses WriteFile when WIN32 is set. WIN32 system calls do not
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* *set errno. thus this error checking is not portable*/
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if (e == EAGAIN || e == EINTR || e == EINPROGRESS)
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goto reschedule;
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/* error case */
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what |= EVBUFFER_ERROR;
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#else
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goto reschedule;
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#endif
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} else if (res == 0) {
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/* eof case */
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what |= EVBUFFER_EOF;
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}
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if (res <= 0)
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goto error;
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if( EVBUFFER_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_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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dbgmsg( io, "event_write_cb got an error. res is %d, what is %hd, errno is %d (%s)", res, what, e, strerror( 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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***
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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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static tr_peerIo*
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tr_peerIoNew( tr_session * session,
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tr_bandwidth * parent,
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const tr_address * addr,
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tr_port port,
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const uint8_t * torrentHash,
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tr_bool isIncoming,
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tr_bool isSeed,
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int socket )
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{
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tr_peerIo * io;
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assert( session != NULL );
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assert( session->events != NULL );
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assert( tr_isBool( isIncoming ) );
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assert( tr_isBool( isSeed ) );
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assert( tr_amInEventThread( session ) );
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if( socket >= 0 ) {
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tr_netSetTOS( socket, session->peerSocketTOS );
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maybeSetCongestionAlgorithm( socket, session->peer_congestion_algorithm );
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}
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io = tr_new0( tr_peerIo, 1 );
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io->magicNumber = MAGIC_NUMBER;
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io->refCount = 1;
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io->crypto = tr_cryptoNew( torrentHash, isIncoming );
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io->session = session;
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io->addr = *addr;
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io->isSeed = isSeed;
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io->port = port;
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io->socket = socket;
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io->isIncoming = isIncoming != 0;
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io->hasFinishedConnecting = FALSE;
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io->timeCreated = tr_time( );
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io->inbuf = evbuffer_new( );
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io->outbuf = evbuffer_new( );
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tr_bandwidthConstruct( &io->bandwidth, session, parent );
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tr_bandwidthSetPeer( &io->bandwidth, io );
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dbgmsg( io, "bandwidth is %p; its parent is %p", &io->bandwidth, parent );
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event_set( &io->event_read, io->socket, EV_READ, event_read_cb, io );
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event_set( &io->event_write, io->socket, EV_WRITE, event_write_cb, io );
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return io;
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}
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tr_peerIo*
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tr_peerIoNewIncoming( tr_session * session,
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tr_bandwidth * parent,
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const tr_address * addr,
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tr_port port,
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int fd )
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{
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assert( session );
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assert( tr_isAddress( addr ) );
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assert( fd >= 0 );
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return tr_peerIoNew( session, parent, addr, port, NULL, TRUE, FALSE, fd );
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}
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tr_peerIo*
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tr_peerIoNewOutgoing( tr_session * session,
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tr_bandwidth * parent,
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const tr_address * addr,
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tr_port port,
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const uint8_t * torrentHash,
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tr_bool isSeed )
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{
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int fd;
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|
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assert( session );
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assert( tr_isAddress( addr ) );
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assert( torrentHash );
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fd = tr_netOpenPeerSocket( session, addr, port, isSeed );
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dbgmsg( NULL, "tr_netOpenPeerSocket returned fd %d", fd );
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return fd < 0 ? NULL
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: tr_peerIoNew( session, parent, addr, port, torrentHash, FALSE, isSeed, fd );
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}
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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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event_enable( tr_peerIo * io, short event )
|
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{
|
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assert( tr_amInEventThread( io->session ) );
|
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assert( io->session != NULL );
|
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assert( io->session->events != NULL );
|
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assert( event_initialized( &io->event_read ) );
|
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assert( event_initialized( &io->event_write ) );
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|
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if( io->socket < 0 )
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return;
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if( ( event & EV_READ ) && ! ( io->pendingEvents & EV_READ ) )
|
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{
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dbgmsg( io, "enabling libevent ready-to-read polling" );
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event_add( &io->event_read, NULL );
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io->pendingEvents |= EV_READ;
|
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}
|
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|
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if( ( event & EV_WRITE ) && ! ( io->pendingEvents & EV_WRITE ) )
|
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{
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dbgmsg( io, "enabling libevent ready-to-write polling" );
|
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event_add( &io->event_write, NULL );
|
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io->pendingEvents |= EV_WRITE;
|
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}
|
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}
|
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|
|
static void
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event_disable( struct tr_peerIo * io, short event )
|
|
{
|
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assert( tr_amInEventThread( io->session ) );
|
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assert( io->session != NULL );
|
|
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 );
|
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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,
|
|
tr_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 )
|
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event_enable( io, event );
|
|
else
|
|
event_disable( io, event );
|
|
}
|
|
|
|
/***
|
|
****
|
|
***/
|
|
|
|
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 );
|
|
tr_netClose( io->session, io->socket );
|
|
tr_cryptoFree( io->crypto );
|
|
tr_list_free( &io->outbuf_datatypes, tr_free );
|
|
|
|
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];
|
|
|
|
if( addr->type == TR_AF_INET )
|
|
tr_snprintf( buf, sizeof( buf ), "%s:%u", tr_ntop_non_ts( addr ), ntohs( port ) );
|
|
else
|
|
tr_snprintf( buf, sizeof( buf ), "[%s]:%u", tr_ntop_non_ts( addr ), ntohs( port ) );
|
|
return buf;
|
|
}
|
|
|
|
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 )
|
|
{
|
|
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 );
|
|
|
|
if( io->socket >= 0 )
|
|
tr_netClose( session, io->socket );
|
|
|
|
io->socket = tr_netOpenPeerSocket( session, &io->addr, io->port, io->isSeed );
|
|
event_set( &io->event_read, io->socket, EV_READ, event_read_cb, io );
|
|
event_set( &io->event_write, 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 ) );
|
|
assert( io->crypto );
|
|
|
|
return tr_cryptoGetTorrentHash( io->crypto );
|
|
}
|
|
|
|
int
|
|
tr_peerIoHasTorrentHash( const tr_peerIo * io )
|
|
{
|
|
assert( tr_isPeerIo( io ) );
|
|
assert( io->crypto );
|
|
|
|
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 size_t
|
|
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 double maxBlockSize = 16 * 1024; /* 16 KiB is from BT spec */
|
|
const double currentSpeed = tr_bandwidthGetPieceSpeed( &io->bandwidth, now, TR_UP );
|
|
const double period = 15; /* arbitrary */
|
|
const double numBlocks = 3.5; /* the 3 is arbitrary; the .5 is to leave room for messages */
|
|
return MAX( maxBlockSize*numBlocks, currentSpeed*1024*period );
|
|
}
|
|
|
|
size_t
|
|
tr_peerIoGetWriteBufferSpace( const tr_peerIo * io, uint64_t now )
|
|
{
|
|
const size_t desiredLen = getDesiredOutputBufferSize( io, now );
|
|
const size_t currentLen = EVBUFFER_LENGTH( io->outbuf );
|
|
size_t freeSpace = 0;
|
|
|
|
if( desiredLen > currentLen )
|
|
freeSpace = desiredLen - currentLen;
|
|
|
|
return freeSpace;
|
|
}
|
|
|
|
/**
|
|
***
|
|
**/
|
|
|
|
void
|
|
tr_peerIoSetEncryption( tr_peerIo * io,
|
|
int encryptionMode )
|
|
{
|
|
assert( tr_isPeerIo( io ) );
|
|
assert( encryptionMode == PEER_ENCRYPTION_NONE
|
|
|| encryptionMode == PEER_ENCRYPTION_RC4 );
|
|
|
|
io->encryptionMode = encryptionMode;
|
|
}
|
|
|
|
/**
|
|
***
|
|
**/
|
|
|
|
void
|
|
tr_peerIoWrite( tr_peerIo * io,
|
|
const void * bytes,
|
|
size_t byteCount,
|
|
tr_bool isPieceData )
|
|
{
|
|
/* FIXME(libevent2): this implementation snould be moved to tr_peerIoWriteBuf. This function should be implemented as evbuffer_new() + evbuffer_add_reference() + a call to tr_peerIoWriteBuf() + evbuffer_free() */
|
|
struct tr_datatype * datatype;
|
|
|
|
assert( tr_amInEventThread( io->session ) );
|
|
dbgmsg( io, "adding %zu bytes into io->output", byteCount );
|
|
|
|
datatype = tr_new( struct tr_datatype, 1 );
|
|
datatype->isPieceData = isPieceData != 0;
|
|
datatype->length = byteCount;
|
|
tr_list_append( &io->outbuf_datatypes, datatype );
|
|
|
|
switch( io->encryptionMode )
|
|
{
|
|
case PEER_ENCRYPTION_RC4:
|
|
{
|
|
/* FIXME(libevent2): use evbuffer_reserve_space() and evbuffer_commit_space() instead of tmp */
|
|
void * tmp = tr_sessionGetBuffer( io->session );
|
|
const size_t tmplen = SESSION_BUFFER_SIZE;
|
|
const uint8_t * walk = bytes;
|
|
evbuffer_expand( io->outbuf, byteCount );
|
|
while( byteCount > 0 )
|
|
{
|
|
const size_t thisPass = MIN( byteCount, tmplen );
|
|
tr_cryptoEncrypt( io->crypto, thisPass, walk, tmp );
|
|
evbuffer_add( io->outbuf, tmp, thisPass );
|
|
walk += thisPass;
|
|
byteCount -= thisPass;
|
|
}
|
|
tr_sessionReleaseBuffer( io->session );
|
|
break;
|
|
}
|
|
|
|
case PEER_ENCRYPTION_NONE:
|
|
evbuffer_add( io->outbuf, bytes, byteCount );
|
|
break;
|
|
|
|
default:
|
|
assert( 0 );
|
|
break;
|
|
}
|
|
}
|
|
|
|
void
|
|
tr_peerIoWriteBuf( tr_peerIo * io,
|
|
struct evbuffer * buf,
|
|
tr_bool isPieceData )
|
|
{
|
|
/* FIXME(libevent2): loop through calls to evbuffer_get_contiguous_space() + evbuffer_drain() */
|
|
const size_t n = EVBUFFER_LENGTH( buf );
|
|
tr_peerIoWrite( io, EVBUFFER_DATA( buf ), n, isPieceData );
|
|
evbuffer_drain( buf, n );
|
|
}
|
|
|
|
/***
|
|
****
|
|
***/
|
|
|
|
void
|
|
tr_peerIoReadBytes( tr_peerIo * io,
|
|
struct evbuffer * inbuf,
|
|
void * bytes,
|
|
size_t byteCount )
|
|
{
|
|
assert( tr_isPeerIo( io ) );
|
|
/* FIXME(libevent2): use evbuffer_get_length() */
|
|
assert( EVBUFFER_LENGTH( inbuf ) >= byteCount );
|
|
|
|
switch( io->encryptionMode )
|
|
{
|
|
case PEER_ENCRYPTION_NONE:
|
|
evbuffer_remove( inbuf, bytes, byteCount );
|
|
break;
|
|
|
|
case PEER_ENCRYPTION_RC4:
|
|
/* FIXME(libevent2): loop through calls to evbuffer_get_contiguous_space() + evbuffer_drain() */
|
|
tr_cryptoDecrypt( io->crypto, byteCount, EVBUFFER_DATA(inbuf), bytes );
|
|
evbuffer_drain(inbuf, byteCount );
|
|
break;
|
|
|
|
default:
|
|
assert( 0 );
|
|
}
|
|
}
|
|
|
|
void
|
|
tr_peerIoDrain( tr_peerIo * io,
|
|
struct evbuffer * inbuf,
|
|
size_t byteCount )
|
|
{
|
|
void * buf = tr_sessionGetBuffer( io->session );
|
|
const size_t buflen = SESSION_BUFFER_SIZE;
|
|
|
|
while( byteCount > 0 )
|
|
{
|
|
const size_t thisPass = MIN( byteCount, buflen );
|
|
tr_peerIoReadBytes( io, inbuf, buf, thisPass );
|
|
byteCount -= thisPass;
|
|
}
|
|
|
|
tr_sessionReleaseBuffer( io->session );
|
|
}
|
|
|
|
/***
|
|
****
|
|
***/
|
|
|
|
static int
|
|
tr_peerIoTryRead( tr_peerIo * io, size_t howmuch )
|
|
{
|
|
int res = 0;
|
|
|
|
if(( howmuch = tr_bandwidthClamp( &io->bandwidth, TR_DOWN, howmuch )))
|
|
{
|
|
int e;
|
|
errno = 0;
|
|
res = evbuffer_read( io->inbuf, io->socket, howmuch );
|
|
e = errno;
|
|
|
|
dbgmsg( io, "read %d from peer (%s)", res, (res==-1?strerror(e):"") );
|
|
|
|
if( EVBUFFER_LENGTH( io->inbuf ) )
|
|
canReadWrapper( io );
|
|
|
|
if( ( res <= 0 ) && ( io->gotError ) && ( e != EAGAIN ) && ( e != EINTR ) && ( e != EINPROGRESS ) )
|
|
{
|
|
short what = EVBUFFER_READ | EVBUFFER_ERROR;
|
|
if( res == 0 )
|
|
what |= EVBUFFER_EOF;
|
|
dbgmsg( io, "tr_peerIoTryRead got an error. res is %d, what is %hd, errno is %d (%s)", res, what, e, strerror( e ) );
|
|
io->gotError( io, what, io->userData );
|
|
}
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
static int
|
|
tr_peerIoTryWrite( tr_peerIo * io, size_t howmuch )
|
|
{
|
|
int n = 0;
|
|
|
|
if(( howmuch = tr_bandwidthClamp( &io->bandwidth, TR_UP, howmuch )))
|
|
{
|
|
int e;
|
|
errno = 0;
|
|
n = tr_evbuffer_write( io, io->socket, howmuch );
|
|
e = errno;
|
|
|
|
if( n > 0 )
|
|
didWriteWrapper( io, n );
|
|
|
|
if( ( n < 0 ) && ( io->gotError ) && ( e != EPIPE ) && ( e != EAGAIN ) && ( e != EINTR ) && ( e != EINPROGRESS ) )
|
|
{
|
|
const short what = EVBUFFER_WRITE | EVBUFFER_ERROR;
|
|
dbgmsg( io, "tr_peerIoTryWrite got an error. res is %d, what is %hd, errno is %d (%s)", n, what, e, strerror( 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( io->hasFinishedConnecting )
|
|
{
|
|
if( dir == TR_DOWN )
|
|
bytesUsed = tr_peerIoTryRead( io, limit );
|
|
else
|
|
bytesUsed = tr_peerIoTryWrite( io, limit );
|
|
}
|
|
|
|
dbgmsg( io, "flushing peer-io, hasFinishedConnecting %d, direction %d, limit %zu, bytesUsed %d", (int)io->hasFinishedConnecting, (int)dir, limit, bytesUsed );
|
|
return bytesUsed;
|
|
}
|
|
|
|
int
|
|
tr_peerIoFlushOutgoingProtocolMsgs( tr_peerIo * io )
|
|
{
|
|
size_t byteCount = 0;
|
|
tr_list * 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 )
|
|
{
|
|
struct tr_datatype * d = it->data;
|
|
|
|
if( d->isPieceData )
|
|
break;
|
|
|
|
byteCount += d->length;
|
|
}
|
|
|
|
return tr_peerIoFlush( io, TR_UP, byteCount );
|
|
}
|