transmission/libtransmission/peer-io.c

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/*
* This file Copyright (C) 2007 Charles Kerr <charles@rebelbase.com>
*
* This file is licensed by the GPL version 2. Works owned by the
* Transmission project are granted a special exemption to clause 2(b)
* so that the bulk of its code can remain under the MIT license.
* This exemption does not extend to derived works not owned by
* the Transmission project.
*
* $Id$
*/
#include <assert.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <event.h>
#include "transmission.h"
#include "crypto.h"
#include "net.h"
#include "peer-io.h"
#include "ratecontrol.h"
#include "trevent.h"
#include "utils.h"
/**
***
**/
struct tr_extensions
{
unsigned int azureusProtocolSupported : 1;
unsigned int extendedProtocolSupported : 1;
unsigned int fastPeersSupported : 1;
/* unsigned int DHTSupported : 1; */
};
struct tr_peerIo
{
struct tr_handle * handle;
struct in_addr in_addr;
int port;
int socket;
int encryptionMode;
struct bufferevent * bufev;
uint8_t peerId[20];
tr_extensions extensions;
unsigned int isEncrypted : 1;
unsigned int isIncoming : 1;
unsigned int peerIdIsSet : 1;
tr_ratecontrol * rateToPeer;
tr_ratecontrol * rateToClient;
tr_can_read_cb canRead;
tr_did_write_cb didWrite;
tr_net_error_cb gotError;
void * userData;
tr_crypto * crypto;
};
/**
***
**/
static void
didWriteWrapper( struct bufferevent * e, void * userData )
{
tr_peerIo * c = (tr_peerIo *) userData;
if( c->didWrite != NULL )
(*c->didWrite)( e, c->userData );
}
static void
canReadWrapper( struct bufferevent * e, void * userData )
{
tr_peerIo * c = (tr_peerIo *) userData;
if( c->canRead == NULL )
return;
for( ;; ) {
const int ret = (*c->canRead)( e, c->userData );
switch( ret ) {
case READ_AGAIN: if( EVBUFFER_LENGTH( e->input ) ) continue; /* note fall-through */
case READ_MORE: tr_peerIoSetIOMode( c, EV_READ, 0 ); return; break;
case READ_DONE: return;
}
}
}
static void
gotErrorWrapper( struct bufferevent * e, short what, void * userData )
{
tr_peerIo * c = (tr_peerIo *) userData;
if( c->gotError != NULL )
(*c->gotError)( e, what, c->userData );
}
/**
***
**/
//static int total_io = 0;
static tr_peerIo*
tr_peerIoNew( struct tr_handle * handle,
struct in_addr * in_addr,
const uint8_t * torrentHash,
int isIncoming,
int socket )
{
tr_peerIo * c;
c = tr_new0( tr_peerIo, 1 );
c->crypto = tr_cryptoNew( torrentHash, isIncoming );
c->handle = handle;
c->in_addr = *in_addr;
c->socket = socket;
c->rateToPeer = tr_rcInit( );
c->rateToClient = tr_rcInit( );
c->isIncoming = isIncoming ? 1 : 0;
c->bufev = bufferevent_new( c->socket,
canReadWrapper,
didWriteWrapper,
gotErrorWrapper,
c );
bufferevent_enable( c->bufev, EV_READ|EV_WRITE );
return c;
}
tr_peerIo*
tr_peerIoNewIncoming( struct tr_handle * handle,
struct in_addr * in_addr,
int socket )
{
tr_peerIo * c;
assert( handle != NULL );
assert( in_addr != NULL );
assert( socket >= 0 );
c = tr_peerIoNew( handle, in_addr, NULL, 1, socket );
c->port = -1;
return c;
}
tr_peerIo*
tr_peerIoNewOutgoing( struct tr_handle * handle,
struct in_addr * in_addr,
int port,
const uint8_t * torrentHash )
{
tr_peerIo * c;
assert( handle != NULL );
assert( in_addr != NULL );
assert( port >= 0 );
assert( torrentHash != NULL );
c = tr_peerIoNew( handle, in_addr, torrentHash, 0,
tr_netOpenTCP( in_addr, port, 0 ) );
c->port = port;
return c;
}
void
tr_peerIoFree( tr_peerIo * c )
{
if( c != NULL )
{
c->canRead = NULL;
c->didWrite = NULL;
c->gotError = NULL;
tr_bufferevent_free( c->handle, c->bufev );
tr_netClose( c->socket );
tr_rcClose( c->rateToClient );
tr_rcClose( c->rateToPeer );
tr_cryptoFree( c->crypto );
tr_free( c );
}
}
tr_handle*
tr_peerIoGetHandle( tr_peerIo * io )
{
assert( io != NULL );
assert( io->handle != NULL );
return io->handle;
}
const struct in_addr*
tr_peerIoGetAddress( const tr_peerIo * io, uint16_t * port )
{
assert( io != NULL );
if( port != NULL )
*port = io->port;
return &io->in_addr;
}
const char*
tr_peerIoGetAddrStr( const tr_peerIo * io )
{
static char buf[512];
assert( io != NULL );
snprintf( buf, sizeof(buf), "%s:%u", inet_ntoa( io->in_addr ), (unsigned int)io->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;
if( EVBUFFER_LENGTH( io->bufev->input ) )
canReadWrapper( io->bufev, io );
}
void
tr_peerIoSetIOMode( tr_peerIo * c, short enable, short disable )
{
tr_setBufferEventMode( c->handle, c->bufev, enable, disable );
}
int
tr_peerIoIsIncoming( const tr_peerIo * c )
{
return c->isIncoming ? 1 : 0;
}
int
tr_peerIoReconnect( tr_peerIo * io )
{
assert( !tr_peerIoIsIncoming( io ) );
if( io->socket >= 0 )
tr_netClose( io->socket );
io->socket = tr_netOpenTCP( &io->in_addr, io->port, 0 );
if( io->socket >= 0 )
{
bufferevent_free( io->bufev );
io->bufev = bufferevent_new( io->socket,
canReadWrapper,
didWriteWrapper,
gotErrorWrapper,
io );
bufferevent_enable( io->bufev, EV_READ|EV_WRITE );
return 0;
}
return -1;
}
/**
***
**/
void
tr_peerIoSetTorrentHash( tr_peerIo * io,
const uint8_t * hash )
{
assert( io != NULL );
tr_cryptoSetTorrentHash( io->crypto, hash );
}
const uint8_t*
tr_peerIoGetTorrentHash( tr_peerIo * io )
{
assert( io != NULL );
assert( io->crypto != NULL );
return tr_cryptoGetTorrentHash( io->crypto );
}
int
tr_peerIoHasTorrentHash( const tr_peerIo * io )
{
assert( io != NULL );
assert( io->crypto != NULL );
return tr_cryptoHasTorrentHash( io->crypto );
}
/**
***
**/
void
tr_peerIoSetPeersId( tr_peerIo * io,
const uint8_t * peer_id )
{
assert( io != NULL );
if(( io->peerIdIsSet = peer_id != NULL ))
memcpy( io->peerId, peer_id, 20 );
else
memset( io->peerId, 0, 20 );
}
const uint8_t*
tr_peerIoGetPeersId( const tr_peerIo * io )
{
assert( io != NULL );
assert( io->peerIdIsSet );
return io->peerId;
}
/**
***
**/
void
tr_peerIoEnableAZMP( tr_peerIo * io, int flag )
{
assert( io != NULL );
assert( flag==0 || flag==1 );
io->extensions.azureusProtocolSupported = flag;
}
void
tr_peerIoEnableLTEP( tr_peerIo * io, int flag )
{
assert( io != NULL );
assert( flag==0 || flag==1 );
io->extensions.extendedProtocolSupported = flag;
}
void
tr_peerIoEnableFEXT( tr_peerIo * io, int flag )
{
assert( io != NULL );
assert( flag==0 || flag==1 );
io->extensions.fastPeersSupported = flag;
}
int
tr_peerIoSupportsAZMP( const tr_peerIo * io )
{
assert( io != NULL );
return io->extensions.azureusProtocolSupported;
}
int
tr_peerIoSupportsLTEP( const tr_peerIo * io )
{
assert( io != NULL );
return io->extensions.extendedProtocolSupported;
}
int
tr_peerIoSupportsFEXT( const tr_peerIo * io )
{
assert( io != NULL );
return io->extensions.fastPeersSupported;
}
/**
***
**/
size_t
tr_peerIoWriteBytesWaiting( const tr_peerIo * io )
{
return EVBUFFER_LENGTH( EVBUFFER_OUTPUT( io->bufev ) );
}
void
tr_peerIoWrite( tr_peerIo * io,
const void * writeme,
int writeme_len )
{
tr_bufferevent_write( io->handle, io->bufev, writeme, writeme_len );
tr_rcTransferred( io->rateToPeer, writeme_len );
}
void
tr_peerIoWriteBuf( tr_peerIo * io,
struct evbuffer * buf )
{
tr_peerIoWrite( io, EVBUFFER_DATA(buf), EVBUFFER_LENGTH(buf) );
evbuffer_drain( buf, ~0 );
}
/**
***
**/
tr_crypto*
tr_peerIoGetCrypto( tr_peerIo * c )
{
return c->crypto;
}
void
tr_peerIoSetEncryption( tr_peerIo * io,
int encryptionMode )
{
assert( io != NULL );
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_peerIoWriteBytes( tr_peerIo * io,
struct evbuffer * outbuf,
const void * bytes,
int byteCount )
{
uint8_t * tmp;
switch( io->encryptionMode )
{
case PEER_ENCRYPTION_NONE:
/*fprintf( stderr, "writing %d plaintext bytes to outbuf...\n", byteCount );*/
evbuffer_add( outbuf, bytes, byteCount );
break;
case PEER_ENCRYPTION_RC4:
/*fprintf( stderr, "encrypting and writing %d bytes to outbuf...\n", byteCount );*/
tmp = tr_new( uint8_t, byteCount );
tr_cryptoEncrypt( io->crypto, byteCount, bytes, tmp );
tr_bufferevent_write( io->handle, io->bufev, tmp, byteCount );
tr_free( tmp );
break;
default:
assert( 0 );
}
}
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,
int byteCount )
{
assert( (int)EVBUFFER_LENGTH( inbuf ) >= byteCount );
switch( io->encryptionMode )
{
case PEER_ENCRYPTION_NONE:
/*fprintf( stderr, "reading %d plaintext bytes from inbuf...\n", byteCount );*/
evbuffer_remove( inbuf, bytes, byteCount );
tr_rcTransferred( io->rateToClient, byteCount );
break;
case PEER_ENCRYPTION_RC4:
/*fprintf( stderr, "reading AND DECRYPTING %d bytes from inbuf...\n", byteCount );*/
evbuffer_remove( inbuf, bytes, byteCount );
tr_cryptoDecrypt( io->crypto, byteCount, bytes, bytes );
tr_rcTransferred( io->rateToClient, byteCount );
break;
default:
assert( 0 );
}
}
void
tr_peerIoReadUint16( tr_peerIo * io,
struct evbuffer * inbuf,
uint16_t * setme )
{
uint16_t tmp;
tr_peerIoReadBytes( io, inbuf, &tmp, sizeof(uint16_t) );
*setme = ntohs( tmp );
}
void
tr_peerIoReadUint32( tr_peerIo * io,
struct evbuffer * inbuf,
uint32_t * setme )
{
uint32_t tmp;
tr_peerIoReadBytes( io, inbuf, &tmp, sizeof(uint32_t) );
*setme = ntohl( tmp );
}
void
tr_peerIoDrain( tr_peerIo * io,
struct evbuffer * inbuf,
int byteCount )
{
uint8_t * tmp = tr_new( uint8_t, byteCount );
tr_peerIoReadBytes( io, inbuf, tmp, byteCount );
tr_free( tmp );
}
/**
***
**/
float
tr_peerIoGetRateToClient( const tr_peerIo * io )
{
return io==NULL ? 0.0f : tr_rcRate( io->rateToClient );
}
float
tr_peerIoGetRateToPeer( const tr_peerIo * io )
{
return io==NULL ? 0.0f : tr_rcRate( io->rateToPeer );
}