874 lines
20 KiB
C
874 lines
20 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 <netinet/in.h> /* struct in_addr */
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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 "crypto.h"
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#include "net.h"
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#include "peer-io.h"
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#include "ratecontrol.h"
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#include "trevent.h"
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#include "utils.h"
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#define IO_TIMEOUT_SECS 8
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/**
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***
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**/
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#define dbgmsg( io, ... ) \
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tr_deepLog( __FILE__, __LINE__, tr_peerIoGetAddrStr( io ), __VA_ARGS__ )
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struct tr_bandwidth
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{
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unsigned int isUnlimited : 1;
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size_t bytesUsed;
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size_t bytesLeft;
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};
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struct tr_peerIo
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{
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unsigned int isEncrypted : 1;
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unsigned int isIncoming : 1;
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unsigned int peerIdIsSet : 1;
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unsigned int extendedProtocolSupported : 1;
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unsigned int fastPeersSupported : 1;
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uint8_t encryptionMode;
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uint8_t timeout;
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uint16_t 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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struct in_addr in_addr;
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struct bufferevent * bufev;
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struct evbuffer * output;
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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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struct tr_bandwidth bandwidth[2];
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tr_ratecontrol * speedometer[2];
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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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adjustOutputBuffer( tr_peerIo * io )
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{
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struct evbuffer * live = EVBUFFER_OUTPUT( io->bufev );
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if( io->bandwidth[TR_UP].isUnlimited )
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{
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bufferevent_write_buffer( io->bufev, io->output );
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}
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else if( io->bandwidth[TR_UP].bytesLeft > EVBUFFER_LENGTH( live ) )
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{
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/* there's free space in bufev's output buffer;
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try to fill it up */
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const size_t desiredLength = io->bandwidth[TR_UP].bytesLeft;
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const size_t under = desiredLength - EVBUFFER_LENGTH( live );
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const size_t n = MIN( under, EVBUFFER_LENGTH( io->output ) );
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bufferevent_write( io->bufev, EVBUFFER_DATA( io->output ), n );
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evbuffer_drain( io->output, n );
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}
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else if( io->bandwidth[TR_UP].bytesLeft < EVBUFFER_LENGTH( live ) )
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{
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/* bufev's output buffer exceeds our bandwidth allocation;
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move the excess out of bufev so it can't be sent yet */
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const size_t desiredLength = io->bandwidth[TR_UP].bytesLeft;
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const size_t over = EVBUFFER_LENGTH( live ) - desiredLength;
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struct evbuffer * buf = evbuffer_new( );
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evbuffer_add( buf, EVBUFFER_DATA( live ) + desiredLength, over );
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evbuffer_add_buffer( buf, io->output );
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evbuffer_free( io->output );
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io->output = buf;
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EVBUFFER_LENGTH( live ) = desiredLength;
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}
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else if( EVBUFFER_LENGTH( live ) )
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{
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bufferevent_enable( io->bufev, EV_WRITE );
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}
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io->bufferSize[TR_UP] = EVBUFFER_LENGTH( live );
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dbgmsg( io, "after adjusting the output buffer, its size is now %zu",
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io->bufferSize[TR_UP] );
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}
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static void
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adjustInputBuffer( tr_peerIo * io )
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{
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if( io->bandwidth[TR_DOWN].isUnlimited )
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{
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dbgmsg( io, "unlimited reading..." );
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bufferevent_setwatermark( io->bufev, EV_READ, 0, 0 );
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bufferevent_enable( io->bufev, EV_READ );
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}
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else
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{
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const size_t n = io->bandwidth[TR_DOWN].bytesLeft;
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if( n == 0 )
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{
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dbgmsg( io, "disabling reads because we've hit our limit" );
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bufferevent_disable( io->bufev, EV_READ );
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}
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else
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{
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dbgmsg( io, "enabling reading of %zu more bytes", n );
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bufferevent_setwatermark( io->bufev, EV_READ, 0, n );
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bufferevent_enable( io->bufev, EV_READ );
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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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didWriteWrapper( struct bufferevent * e,
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void * vio )
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{
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tr_peerIo * io = vio;
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const size_t len = EVBUFFER_LENGTH( EVBUFFER_OUTPUT( e ) );
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dbgmsg( io, "didWrite... io->outputBufferSize was %zu, is now %zu",
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io->bufferSize[TR_UP], len );
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if( len < io->bufferSize[TR_UP] )
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{
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const size_t n = io->bufferSize[TR_UP] - len;
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struct tr_bandwidth * b = &io->bandwidth[TR_UP];
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b->bytesLeft -= MIN( b->bytesLeft, (size_t)n );
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b->bytesUsed += n;
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tr_rcTransferred( io->speedometer[TR_UP], n );
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dbgmsg( io,
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"wrote %zu bytes to peer... upload bytesLeft is now %zu",
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n,
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b->bytesLeft );
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}
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adjustOutputBuffer( io );
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if( io->didWrite )
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io->didWrite( e, io->userData );
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}
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static void
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canReadWrapper( struct bufferevent * e,
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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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const size_t len = EVBUFFER_LENGTH( EVBUFFER_INPUT( e ) );
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dbgmsg( io, "canRead" );
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/* if the input buffer has grown, record the bytes that were read */
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if( len > io->bufferSize[TR_DOWN] )
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{
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const size_t n = len - io->bufferSize[TR_DOWN];
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struct tr_bandwidth * b = io->bandwidth + TR_DOWN;
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b->bytesLeft -= MIN( b->bytesLeft, (size_t)n );
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b->bytesUsed += n;
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tr_rcTransferred( io->speedometer[TR_DOWN], n );
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dbgmsg( io,
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"%zu new input bytes. bytesUsed is %zu, bytesLeft is %zu",
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n, b->bytesUsed,
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b->bytesLeft );
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adjustInputBuffer( io );
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}
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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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const int ret = io->canRead( e, io->userData );
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switch( ret )
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{
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case READ_NOW:
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if( EVBUFFER_LENGTH( e->input ) )
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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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if( !err )
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io->bufferSize[TR_DOWN] = EVBUFFER_LENGTH( EVBUFFER_INPUT( e ) );
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}
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static void
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gotErrorWrapper( struct bufferevent * e,
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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( e, 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->bufev = bufferevent_new( io->socket,
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canReadWrapper,
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didWriteWrapper,
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gotErrorWrapper,
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io );
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/* tell libevent to call didWriteWrapper after every write,
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* not just when the write buffer is empty */
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bufferevent_setwatermark( io->bufev, EV_WRITE, INT_MAX, 0 );
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bufferevent_settimeout( io->bufev, io->timeout, io->timeout );
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bufferevent_enable( io->bufev, EV_READ | EV_WRITE );
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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 struct in_addr * in_addr,
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uint16_t 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->crypto = tr_cryptoNew( torrentHash, isIncoming );
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io->session = session;
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io->in_addr = *in_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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io->output = evbuffer_new( );
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io->bandwidth[TR_UP].isUnlimited = 1;
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io->bandwidth[TR_DOWN].isUnlimited = 1;
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io->speedometer[TR_UP] = tr_rcInit( );
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io->speedometer[TR_DOWN] = tr_rcInit( );
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bufevNew( 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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const struct in_addr * in_addr,
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uint16_t port,
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int socket )
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{
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assert( session );
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assert( in_addr );
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assert( socket >= 0 );
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return tr_peerIoNew( session, in_addr, port,
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NULL, 1,
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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 struct in_addr * in_addr,
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int 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( in_addr );
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assert( port >= 0 );
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assert( torrentHash );
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socket = tr_netOpenTCP( in_addr, port, 0 );
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return socket < 0
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? NULL
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: tr_peerIoNew( session, in_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_rcClose( io->speedometer[TR_DOWN] );
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tr_rcClose( io->speedometer[TR_UP] );
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evbuffer_free( io->output );
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bufferevent_free( io->bufev );
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tr_netClose( io->socket );
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tr_cryptoFree( io->crypto );
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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( io );
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assert( io->session );
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return io->session;
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}
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const struct in_addr*
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tr_peerIoGetAddress( const tr_peerIo * io,
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uint16_t * port )
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{
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assert( io );
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if( port )
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*port = io->port;
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return &io->in_addr;
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}
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const char*
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tr_peerIoAddrStr( const struct in_addr * addr,
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uint16_t port )
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{
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static char buf[512];
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tr_snprintf( buf, sizeof( buf ), "%s:%u", inet_ntoa( *addr ),
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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->in_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( io->bufev->input ) )
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canReadWrapper( io->bufev, 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->in_addr, io->port, 0 );
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if( io->socket >= 0 )
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{
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tr_netSetTOS( io->socket, io->session->peerSocketTOS );
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bufferevent_free( io->bufev );
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bufevNew( io );
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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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bufferevent_settimeout( io->bufev, io->timeout, io->timeout );
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bufferevent_enable( io->bufev, 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( 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( 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( 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( 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( 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_peerIoEnableLTEP( tr_peerIo * io,
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int flag )
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{
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assert( io );
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assert( flag == 0 || flag == 1 );
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io->extendedProtocolSupported = flag;
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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( io );
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assert( flag == 0 || flag == 1 );
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io->fastPeersSupported = 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( io );
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return io->extendedProtocolSupported;
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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( io );
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return io->fastPeersSupported;
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}
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/**
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***
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**/
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size_t
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tr_peerIoGetBandwidthUsed( const tr_peerIo * io,
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tr_direction direction )
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{
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assert( io );
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assert( direction == TR_UP || direction == TR_DOWN );
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return io->bandwidth[direction].bytesUsed;
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}
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size_t
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tr_peerIoGetBandwidthLeft( const tr_peerIo * io,
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tr_direction direction )
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{
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assert( io );
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assert( direction == TR_UP || direction == TR_DOWN );
|
|
return io->bandwidth[direction].bytesLeft;
|
|
}
|
|
|
|
size_t
|
|
tr_peerIoGetWriteBufferSpace( const tr_peerIo * io )
|
|
{
|
|
const size_t desiredBufferLen = 4096;
|
|
const size_t currentLiveLen =
|
|
EVBUFFER_LENGTH( EVBUFFER_OUTPUT( io->bufev ) );
|
|
|
|
const size_t desiredLiveLen = tr_peerIoGetBandwidthLeft( io, TR_UP );
|
|
const size_t currentLbufLen = EVBUFFER_LENGTH( io->output );
|
|
|
|
const size_t desiredLen = desiredBufferLen + desiredLiveLen;
|
|
const size_t currentLen = currentLiveLen + currentLbufLen;
|
|
|
|
size_t freeSpace = 0;
|
|
|
|
if( desiredLen > currentLen )
|
|
freeSpace = desiredLen - currentLen;
|
|
else
|
|
freeSpace = 0;
|
|
|
|
return freeSpace;
|
|
}
|
|
|
|
void
|
|
tr_peerIoSetBandwidth( tr_peerIo * io,
|
|
tr_direction direction,
|
|
size_t bytesLeft )
|
|
{
|
|
struct tr_bandwidth * b;
|
|
|
|
assert( io );
|
|
assert( direction == TR_UP || direction == TR_DOWN );
|
|
|
|
b = io->bandwidth + direction;
|
|
b->isUnlimited = 0;
|
|
b->bytesUsed = 0;
|
|
b->bytesLeft = bytesLeft;
|
|
|
|
adjustOutputBuffer( io );
|
|
adjustInputBuffer( io );
|
|
}
|
|
|
|
void
|
|
tr_peerIoSetBandwidthUnlimited( tr_peerIo * io,
|
|
tr_direction direction )
|
|
{
|
|
struct tr_bandwidth * b;
|
|
|
|
assert( io );
|
|
assert( direction == TR_UP || direction == TR_DOWN );
|
|
|
|
b = io->bandwidth + direction;
|
|
b->isUnlimited = 1;
|
|
b->bytesUsed = 0;
|
|
b->bytesLeft = 0;
|
|
|
|
adjustInputBuffer( io );
|
|
adjustOutputBuffer( io );
|
|
}
|
|
|
|
double
|
|
tr_peerIoGetRateToClient( const tr_peerIo * io )
|
|
{
|
|
return tr_rcRate( io->speedometer[TR_DOWN] );
|
|
}
|
|
|
|
double
|
|
tr_peerIoGetRateToPeer( const tr_peerIo * io )
|
|
{
|
|
return tr_rcRate( io->speedometer[TR_UP] );
|
|
}
|
|
|
|
/**
|
|
***
|
|
**/
|
|
|
|
tr_crypto*
|
|
tr_peerIoGetCrypto( tr_peerIo * c )
|
|
{
|
|
return c->crypto;
|
|
}
|
|
|
|
void
|
|
tr_peerIoSetEncryption( tr_peerIo * io,
|
|
int encryptionMode )
|
|
{
|
|
assert( 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;
|
|
}
|
|
|
|
/**
|
|
***
|
|
**/
|
|
|
|
int
|
|
tr_peerIoWantsBandwidth( const tr_peerIo * io,
|
|
tr_direction direction )
|
|
{
|
|
assert( direction == TR_UP || direction == TR_DOWN );
|
|
|
|
if( direction == TR_DOWN )
|
|
{
|
|
return TRUE; /* FIXME -- is there a good way to test for this? */
|
|
}
|
|
else
|
|
{
|
|
return EVBUFFER_LENGTH( EVBUFFER_OUTPUT( io->bufev ) )
|
|
|| EVBUFFER_LENGTH( io->output );
|
|
}
|
|
}
|
|
|
|
void
|
|
tr_peerIoWrite( tr_peerIo * io,
|
|
const void * writeme,
|
|
size_t writemeLen )
|
|
{
|
|
assert( tr_amInEventThread( io->session ) );
|
|
dbgmsg( io, "adding %zu bytes into io->output", writemeLen );
|
|
|
|
if( io->bandwidth[TR_UP].isUnlimited )
|
|
bufferevent_write( io->bufev, writeme, writemeLen );
|
|
else
|
|
evbuffer_add( io->output, writeme, writemeLen );
|
|
|
|
adjustOutputBuffer( io );
|
|
}
|
|
|
|
void
|
|
tr_peerIoWriteBuf( tr_peerIo * io,
|
|
struct evbuffer * buf )
|
|
{
|
|
const size_t n = EVBUFFER_LENGTH( buf );
|
|
|
|
tr_peerIoWrite( io, EVBUFFER_DATA( buf ), n );
|
|
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;
|
|
}
|
|
|