mirror of
https://github.com/transmission/transmission
synced 2024-12-27 18:18:10 +00:00
778 lines
18 KiB
C
778 lines
18 KiB
C
/*
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* This file Copyright (C) 2007-2008 Charles Kerr <charles@rebelbase.com>
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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 <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 "bandwidth.h"
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#include "crypto.h"
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#include "iobuf.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"
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#include "utils.h"
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#define MAGIC_NUMBER 206745
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#define IO_TIMEOUT_SECS 8
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static size_t
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getPacketOverhead( 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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static 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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struct tr_peerIo
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{
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tr_bool isEncrypted;
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tr_bool isIncoming;
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tr_bool peerIdIsSet;
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tr_bool extendedProtocolSupported;
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tr_bool fastExtensionSupported;
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int magicNumber;
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uint8_t encryptionMode;
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uint8_t timeout;
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tr_port port;
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int socket;
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uint8_t peerId[20];
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time_t timeCreated;
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tr_session * session;
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tr_address addr;
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struct tr_iobuf * iobuf;
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tr_list * output_datatypes; /* struct tr_datatype */
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tr_can_read_cb canRead;
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tr_did_write_cb didWrite;
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tr_net_error_cb gotError;
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void * userData;
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size_t bufferSize[2];
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tr_bandwidth * bandwidth;
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tr_crypto * crypto;
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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( struct tr_iobuf * iobuf,
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size_t bytes_transferred,
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void * vio )
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{
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tr_peerIo * io = vio;
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while( bytes_transferred )
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{
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struct tr_datatype * next = io->output_datatypes->data;
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const size_t payload = MIN( next->length, bytes_transferred );
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const size_t overhead = getPacketOverhead( 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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bytes_transferred -= payload;
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next->length -= payload;
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if( !next->length )
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tr_free( tr_list_pop_front( &io->output_datatypes ) );
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}
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if( EVBUFFER_LENGTH( tr_iobuf_output( iobuf ) ) )
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tr_iobuf_enable( io->iobuf, EV_WRITE );
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}
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static void
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canReadWrapper( struct tr_iobuf * iobuf,
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size_t bytes_transferred UNUSED,
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void * vio )
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{
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int done = 0;
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int err = 0;
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tr_peerIo * io = vio;
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tr_session * session = io->session;
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dbgmsg( io, "canRead" );
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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_globalLock( 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( tr_iobuf_input( iobuf ) );
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const int ret = io->canRead( iobuf, io->userData, &piece );
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if( ret != READ_ERR )
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{
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const size_t used = oldLen - EVBUFFER_LENGTH( tr_iobuf_input( iobuf ) );
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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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}
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switch( ret )
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{
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case READ_NOW:
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if( EVBUFFER_LENGTH( tr_iobuf_input( iobuf )))
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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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}
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tr_globalUnlock( session );
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}
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}
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static void
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gotErrorWrapper( struct tr_iobuf * iobuf,
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short what,
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void * userData )
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{
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tr_peerIo * c = userData;
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if( c->gotError )
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c->gotError( iobuf, what, c->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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bufevNew( tr_peerIo * io )
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{
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io->iobuf = tr_iobuf_new( io->session,
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io->bandwidth,
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io->socket,
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EV_READ | EV_WRITE,
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canReadWrapper,
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didWriteWrapper,
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gotErrorWrapper,
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io );
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tr_iobuf_settimeout( io->iobuf, io->timeout, io->timeout );
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}
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static int
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isPeerIo( const tr_peerIo * io )
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{
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return ( io != NULL ) && ( io->magicNumber == MAGIC_NUMBER );
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}
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static int
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isFlag( int flag )
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{
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return( ( flag == 0 ) || ( flag == 1 ) );
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}
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static tr_peerIo*
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tr_peerIoNew( tr_session * session,
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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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int isIncoming,
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int socket )
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{
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tr_peerIo * io;
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if( socket >= 0 )
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tr_netSetTOS( socket, session->peerSocketTOS );
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io = tr_new0( tr_peerIo, 1 );
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io->magicNumber = MAGIC_NUMBER;
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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->port = port;
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io->socket = socket;
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io->isIncoming = isIncoming != 0;
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io->timeout = IO_TIMEOUT_SECS;
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io->timeCreated = time( NULL );
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bufevNew( io );
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tr_peerIoSetBandwidth( io, session->bandwidth );
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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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const tr_address * addr,
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tr_port port,
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int socket )
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{
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assert( session );
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assert( addr );
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assert( socket >= 0 );
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return tr_peerIoNew( session, addr, port, NULL, 1, socket );
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}
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tr_peerIo*
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tr_peerIoNewOutgoing( tr_session * session,
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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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{
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int socket;
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assert( session );
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assert( addr );
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assert( torrentHash );
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socket = tr_netOpenTCP( session, addr, port );
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return socket < 0
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? NULL
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: tr_peerIoNew( session, addr, port, torrentHash, 0, socket );
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}
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static void
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io_dtor( void * vio )
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{
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tr_peerIo * io = vio;
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tr_peerIoSetBandwidth( io, NULL );
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tr_iobuf_free( io->iobuf );
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tr_netClose( io->socket );
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tr_cryptoFree( io->crypto );
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tr_list_free( &io->output_datatypes, tr_free );
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io->magicNumber = 0xDEAD;
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tr_free( io );
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}
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void
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tr_peerIoFree( tr_peerIo * io )
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{
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if( io )
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{
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io->canRead = NULL;
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io->didWrite = NULL;
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io->gotError = NULL;
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tr_runInEventThread( io->session, io_dtor, io );
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}
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}
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tr_session*
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tr_peerIoGetSession( tr_peerIo * io )
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{
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assert( isPeerIo( io ) );
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assert( io->session );
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return io->session;
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}
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const tr_address*
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tr_peerIoGetAddress( const tr_peerIo * io,
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tr_port * port )
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{
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assert( isPeerIo( io ) );
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if( port )
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*port = io->port;
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return &io->addr;
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}
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const char*
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tr_peerIoAddrStr( const tr_address * addr,
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tr_port port )
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{
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static char buf[512];
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if( addr->type == TR_AF_INET )
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tr_snprintf( buf, sizeof( buf ), "%s:%u", tr_ntop_non_ts( addr ), ntohs( port ) );
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else
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tr_snprintf( buf, sizeof( buf ), "[%s]:%u", tr_ntop_non_ts( addr ), ntohs( port ) );
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return buf;
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}
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const char*
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tr_peerIoGetAddrStr( const tr_peerIo * io )
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{
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return tr_peerIoAddrStr( &io->addr, io->port );
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}
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static void
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tr_peerIoTryRead( tr_peerIo * io )
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{
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if( EVBUFFER_LENGTH( tr_iobuf_input( io->iobuf )))
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(*canReadWrapper)( io->iobuf, ~0, io );
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}
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void
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tr_peerIoSetIOFuncs( tr_peerIo * io,
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tr_can_read_cb readcb,
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tr_did_write_cb writecb,
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tr_net_error_cb errcb,
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void * userData )
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{
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io->canRead = readcb;
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io->didWrite = writecb;
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io->gotError = errcb;
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io->userData = userData;
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tr_peerIoTryRead( io );
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}
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int
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tr_peerIoIsIncoming( const tr_peerIo * c )
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{
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return c->isIncoming ? 1 : 0;
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}
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int
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tr_peerIoReconnect( tr_peerIo * io )
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{
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assert( !tr_peerIoIsIncoming( io ) );
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if( io->socket >= 0 )
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tr_netClose( io->socket );
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io->socket = tr_netOpenTCP( io->session, &io->addr, io->port );
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if( io->socket >= 0 )
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{
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tr_bandwidth * bandwidth = io->bandwidth;
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tr_peerIoSetBandwidth( io, NULL );
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tr_netSetTOS( io->socket, io->session->peerSocketTOS );
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tr_iobuf_free( io->iobuf );
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bufevNew( io );
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tr_peerIoSetBandwidth( io, bandwidth );
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return 0;
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}
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return -1;
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}
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void
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tr_peerIoSetTimeoutSecs( tr_peerIo * io,
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int secs )
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{
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io->timeout = secs;
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tr_iobuf_settimeout( io->iobuf, io->timeout, io->timeout );
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tr_iobuf_enable( io->iobuf, EV_READ | EV_WRITE );
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}
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/**
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***
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**/
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void
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tr_peerIoSetTorrentHash( tr_peerIo * io,
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const uint8_t * hash )
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{
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assert( isPeerIo( io ) );
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tr_cryptoSetTorrentHash( io->crypto, hash );
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}
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const uint8_t*
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tr_peerIoGetTorrentHash( tr_peerIo * io )
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{
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assert( isPeerIo( io ) );
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assert( io->crypto );
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return tr_cryptoGetTorrentHash( io->crypto );
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}
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int
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tr_peerIoHasTorrentHash( const tr_peerIo * io )
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{
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assert( isPeerIo( io ) );
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assert( io->crypto );
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return tr_cryptoHasTorrentHash( io->crypto );
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}
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/**
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***
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**/
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void
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tr_peerIoSetPeersId( tr_peerIo * io,
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const uint8_t * peer_id )
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{
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assert( isPeerIo( io ) );
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if( ( io->peerIdIsSet = peer_id != NULL ) )
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memcpy( io->peerId, peer_id, 20 );
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else
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memset( io->peerId, 0, 20 );
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}
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const uint8_t*
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tr_peerIoGetPeersId( const tr_peerIo * io )
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{
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assert( isPeerIo( io ) );
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assert( io->peerIdIsSet );
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return io->peerId;
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}
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/**
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***
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**/
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void
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tr_peerIoEnableFEXT( tr_peerIo * io,
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int flag )
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{
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assert( isPeerIo( io ) );
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assert( isFlag( flag ) );
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dbgmsg( io, "setting FEXT support flag to %d", (flag?1:0) );
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io->fastExtensionSupported = flag;
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}
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int
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tr_peerIoSupportsFEXT( const tr_peerIo * io )
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{
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assert( isPeerIo( io ) );
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return io->fastExtensionSupported;
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}
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/**
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***
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**/
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void
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tr_peerIoEnableLTEP( tr_peerIo * io,
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int flag )
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{
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assert( isPeerIo( io ) );
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assert( isFlag( flag ) );
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dbgmsg( io, "setting LTEP support flag to %d", (flag?1:0) );
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io->extendedProtocolSupported = flag;
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}
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int
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tr_peerIoSupportsLTEP( const tr_peerIo * io )
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{
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assert( isPeerIo( io ) );
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return io->extendedProtocolSupported;
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}
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/**
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***
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**/
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static size_t
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getDesiredOutputBufferSize( const tr_peerIo * io )
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{
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/* this is all kind of arbitrary, but what seems to work well is
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* being large enough to hold the next 15 seconds' worth of input,
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* or two and a half blocks, whichever is bigger.
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* It's okay to tweak this as needed */
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const double maxBlockSize = 16 * 1024; /* 16 KiB is from BT spec */
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const double currentSpeed = tr_bandwidthGetPieceSpeed( io->bandwidth, TR_UP );
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const double period = 20; /* arbitrary */
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return MAX( maxBlockSize*2.5, currentSpeed*1024*period );
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}
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size_t
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tr_peerIoGetWriteBufferSpace( const tr_peerIo * io )
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{
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const size_t desiredLen = getDesiredOutputBufferSize( io );
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const size_t currentLen = EVBUFFER_LENGTH( tr_iobuf_output( io->iobuf ) );
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size_t freeSpace = 0;
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if( desiredLen > currentLen )
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freeSpace = desiredLen - currentLen;
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return freeSpace;
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}
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void
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tr_peerIoSetBandwidth( tr_peerIo * io,
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tr_bandwidth * bandwidth )
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{
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assert( isPeerIo( io ) );
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if( io->bandwidth )
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tr_bandwidthRemoveBuffer( io->bandwidth, io->iobuf );
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io->bandwidth = bandwidth;
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tr_iobuf_set_bandwidth( io->iobuf, bandwidth );
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if( io->bandwidth )
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tr_bandwidthAddBuffer( io->bandwidth, io->iobuf );
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tr_iobuf_enable( io->iobuf, EV_READ | EV_WRITE );
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}
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/**
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***
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**/
|
|
|
|
tr_crypto*
|
|
tr_peerIoGetCrypto( tr_peerIo * c )
|
|
{
|
|
return c->crypto;
|
|
}
|
|
|
|
void
|
|
tr_peerIoSetEncryption( tr_peerIo * io,
|
|
int encryptionMode )
|
|
{
|
|
assert( isPeerIo( io ) );
|
|
assert( encryptionMode == PEER_ENCRYPTION_NONE
|
|
|| encryptionMode == PEER_ENCRYPTION_RC4 );
|
|
|
|
io->encryptionMode = encryptionMode;
|
|
}
|
|
|
|
int
|
|
tr_peerIoIsEncrypted( const tr_peerIo * io )
|
|
{
|
|
return io != NULL && io->encryptionMode == PEER_ENCRYPTION_RC4;
|
|
}
|
|
|
|
/**
|
|
***
|
|
**/
|
|
|
|
void
|
|
tr_peerIoWrite( tr_peerIo * io,
|
|
const void * writeme,
|
|
size_t writemeLen,
|
|
int isPieceData )
|
|
{
|
|
struct tr_datatype * datatype;
|
|
assert( tr_amInEventThread( io->session ) );
|
|
dbgmsg( io, "adding %zu bytes into io->output", writemeLen );
|
|
|
|
datatype = tr_new( struct tr_datatype, 1 );
|
|
datatype->isPieceData = isPieceData != 0;
|
|
datatype->length = writemeLen;
|
|
tr_list_append( &io->output_datatypes, datatype );
|
|
|
|
evbuffer_add( tr_iobuf_output( io->iobuf ), writeme, writemeLen );
|
|
tr_iobuf_enable( io->iobuf, EV_WRITE );
|
|
}
|
|
|
|
void
|
|
tr_peerIoWriteBuf( tr_peerIo * io,
|
|
struct evbuffer * buf,
|
|
int isPieceData )
|
|
{
|
|
const size_t n = EVBUFFER_LENGTH( buf );
|
|
|
|
tr_peerIoWrite( io, EVBUFFER_DATA( buf ), n, isPieceData );
|
|
evbuffer_drain( buf, n );
|
|
}
|
|
|
|
/**
|
|
***
|
|
**/
|
|
|
|
void
|
|
tr_peerIoWriteBytes( tr_peerIo * io,
|
|
struct evbuffer * outbuf,
|
|
const void * bytes,
|
|
size_t byteCount )
|
|
{
|
|
uint8_t * tmp;
|
|
|
|
switch( io->encryptionMode )
|
|
{
|
|
case PEER_ENCRYPTION_NONE:
|
|
evbuffer_add( outbuf, bytes, byteCount );
|
|
break;
|
|
|
|
case PEER_ENCRYPTION_RC4:
|
|
tmp = tr_new( uint8_t, byteCount );
|
|
tr_cryptoEncrypt( io->crypto, byteCount, bytes, tmp );
|
|
evbuffer_add( outbuf, tmp, byteCount );
|
|
tr_free( tmp );
|
|
break;
|
|
|
|
default:
|
|
assert( 0 );
|
|
}
|
|
}
|
|
|
|
void
|
|
tr_peerIoWriteUint8( tr_peerIo * io,
|
|
struct evbuffer * outbuf,
|
|
uint8_t writeme )
|
|
{
|
|
tr_peerIoWriteBytes( io, outbuf, &writeme, sizeof( uint8_t ) );
|
|
}
|
|
|
|
void
|
|
tr_peerIoWriteUint16( tr_peerIo * io,
|
|
struct evbuffer * outbuf,
|
|
uint16_t writeme )
|
|
{
|
|
uint16_t tmp = htons( writeme );
|
|
|
|
tr_peerIoWriteBytes( io, outbuf, &tmp, sizeof( uint16_t ) );
|
|
}
|
|
|
|
void
|
|
tr_peerIoWriteUint32( tr_peerIo * io,
|
|
struct evbuffer * outbuf,
|
|
uint32_t writeme )
|
|
{
|
|
uint32_t tmp = htonl( writeme );
|
|
|
|
tr_peerIoWriteBytes( io, outbuf, &tmp, sizeof( uint32_t ) );
|
|
}
|
|
|
|
/***
|
|
****
|
|
***/
|
|
|
|
void
|
|
tr_peerIoReadBytes( tr_peerIo * io,
|
|
struct evbuffer * inbuf,
|
|
void * bytes,
|
|
size_t byteCount )
|
|
{
|
|
assert( EVBUFFER_LENGTH( inbuf ) >= byteCount );
|
|
|
|
switch( io->encryptionMode )
|
|
{
|
|
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_peerIoReadUint8( tr_peerIo * io,
|
|
struct evbuffer * inbuf,
|
|
uint8_t * setme )
|
|
{
|
|
tr_peerIoReadBytes( io, inbuf, setme, sizeof( uint8_t ) );
|
|
}
|
|
|
|
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 )
|
|
{
|
|
uint8_t * tmp = tr_new( uint8_t, byteCount );
|
|
|
|
tr_peerIoReadBytes( io, inbuf, tmp, byteCount );
|
|
tr_free( tmp );
|
|
}
|
|
|
|
int
|
|
tr_peerIoGetAge( const tr_peerIo * io )
|
|
{
|
|
return time( NULL ) - io->timeCreated;
|
|
}
|