580 lines
12 KiB
C
580 lines
12 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 <string.h>
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#include <stdio.h>
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#include <unistd.h>
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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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#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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/* arbitrary */
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#define TR_RDBUF (1024*8)
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/**
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***
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**/
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struct tr_extensions
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{
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unsigned int extendedProtocolSupported : 1;
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unsigned int fastPeersSupported : 1;
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};
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struct tr_peerIo
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{
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struct tr_handle * handle;
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struct in_addr in_addr;
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int port;
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int socket;
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int encryptionMode;
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int timeout;
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struct bufferevent * bufev;
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uint8_t peerId[20];
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tr_extensions extensions;
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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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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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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 bufferevent * e, void * userData )
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{
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tr_peerIo * c = (tr_peerIo *) userData;
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if( c->didWrite != NULL )
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(*c->didWrite)( e, c->userData );
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}
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static void
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canReadWrapper( struct bufferevent * e, void * userData )
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{
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int done = 0;
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tr_peerIo * c = userData;
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tr_handle * handle = c->handle;
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if( c->canRead == NULL )
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return;
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tr_globalLock( handle );
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while( !done )
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{
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const int ret = (*c->canRead)( e, c->userData );
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switch( ret )
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{
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case READ_AGAIN:
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if( EVBUFFER_LENGTH( e->input ) )
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continue;
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case READ_MORE:
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case READ_DONE:
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done = 1;
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}
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}
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tr_globalUnlock( handle );
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}
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static void
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gotErrorWrapper( struct bufferevent * e, short what, void * userData )
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{
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tr_peerIo * c = userData;
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if( c->gotError != NULL )
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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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void bufferevent_setwatermark(struct bufferevent *, short, size_t, size_t);
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static tr_peerIo*
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tr_peerIoNew( struct tr_handle * handle,
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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 * c;
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c = tr_new0( tr_peerIo, 1 );
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c->crypto = tr_cryptoNew( torrentHash, isIncoming );
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c->handle = handle;
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c->in_addr = *in_addr;
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c->port = port;
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c->socket = socket;
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c->isIncoming = isIncoming ? 1 : 0;
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c->timeout = IO_TIMEOUT_SECS;
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c->bufev = bufferevent_new( c->socket,
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canReadWrapper,
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didWriteWrapper,
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gotErrorWrapper,
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c );
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bufferevent_settimeout( c->bufev, c->timeout, c->timeout );
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bufferevent_enable( c->bufev, EV_READ|EV_WRITE );
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bufferevent_setwatermark( c->bufev, EV_READ, 0, TR_RDBUF );
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return c;
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}
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tr_peerIo*
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tr_peerIoNewIncoming( struct tr_handle * handle,
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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( handle != NULL );
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assert( in_addr != NULL );
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assert( socket >= 0 );
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return tr_peerIoNew( handle, 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( struct tr_handle * handle,
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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( handle != NULL );
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assert( in_addr != NULL );
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assert( port >= 0 );
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assert( torrentHash != NULL );
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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( handle, 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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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 != NULL )
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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->handle, io_dtor, io );
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}
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}
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tr_handle*
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tr_peerIoGetHandle( tr_peerIo * io )
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{
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assert( io != NULL );
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assert( io->handle != NULL );
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return io->handle;
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}
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const struct in_addr*
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tr_peerIoGetAddress( const tr_peerIo * io, uint16_t * port )
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{
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assert( io != NULL );
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if( port != NULL )
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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, uint16_t port )
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{
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static char buf[512];
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snprintf( buf, sizeof(buf), "%s:%u", inet_ntoa( *addr ), (unsigned int)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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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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bufferevent_free( io->bufev );
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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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bufferevent_settimeout( io->bufev, io->timeout, io->timeout );
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bufferevent_enable( io->bufev, EV_READ|EV_WRITE );
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bufferevent_setwatermark( io->bufev, EV_READ, 0, TR_RDBUF );
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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, 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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}
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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 != NULL );
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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 != NULL );
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assert( io->crypto != NULL );
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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 != NULL );
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assert( io->crypto != NULL );
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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 != NULL );
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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 != NULL );
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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, int flag )
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{
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assert( io != NULL );
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assert( flag==0 || flag==1 );
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io->extensions.extendedProtocolSupported = flag;
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}
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void
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tr_peerIoEnableFEXT( tr_peerIo * io, int flag )
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{
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assert( io != NULL );
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assert( flag==0 || flag==1 );
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io->extensions.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 != NULL );
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return io->extensions.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 != NULL );
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return io->extensions.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_peerIoWriteBytesWaiting( const tr_peerIo * io )
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{
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return EVBUFFER_LENGTH( EVBUFFER_OUTPUT( io->bufev ) );
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}
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void
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tr_peerIoWrite( tr_peerIo * io,
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const void * writeme,
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int writeme_len )
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{
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assert( tr_amInEventThread( io->handle ) );
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bufferevent_write( io->bufev, writeme, writeme_len );
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}
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void
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tr_peerIoWriteBuf( tr_peerIo * io,
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struct evbuffer * buf )
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{
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const size_t n = EVBUFFER_LENGTH( buf );
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tr_peerIoWrite( io, EVBUFFER_DATA(buf), n );
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evbuffer_drain( buf, n );
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}
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/**
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***
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**/
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tr_crypto*
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tr_peerIoGetCrypto( tr_peerIo * c )
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{
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return c->crypto;
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}
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void
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tr_peerIoSetEncryption( tr_peerIo * io,
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int encryptionMode )
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{
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assert( io != NULL );
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assert( encryptionMode==PEER_ENCRYPTION_NONE || encryptionMode==PEER_ENCRYPTION_RC4 );
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io->encryptionMode = encryptionMode;
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}
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int
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tr_peerIoIsEncrypted( const tr_peerIo * io )
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{
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return io!=NULL && io->encryptionMode==PEER_ENCRYPTION_RC4;
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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_peerIoWriteBytes( tr_peerIo * io,
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struct evbuffer * outbuf,
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const void * bytes,
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size_t byteCount )
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{
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uint8_t * tmp;
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switch( io->encryptionMode )
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{
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case PEER_ENCRYPTION_NONE:
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evbuffer_add( outbuf, bytes, byteCount );
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break;
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case PEER_ENCRYPTION_RC4:
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tmp = tr_new( uint8_t, byteCount );
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tr_cryptoEncrypt( io->crypto, byteCount, bytes, tmp );
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evbuffer_add( outbuf, tmp, byteCount );
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tr_free( tmp );
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break;
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default:
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assert( 0 );
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}
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}
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void
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tr_peerIoWriteUint8( tr_peerIo * io,
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struct evbuffer * outbuf,
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uint8_t writeme )
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{
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tr_peerIoWriteBytes( io, outbuf, &writeme, sizeof(uint8_t) );
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}
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void
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tr_peerIoWriteUint16( tr_peerIo * io,
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struct evbuffer * outbuf,
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uint16_t writeme )
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{
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uint16_t tmp = htons( writeme );
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tr_peerIoWriteBytes( io, outbuf, &tmp, sizeof(uint16_t) );
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}
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void
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tr_peerIoWriteUint32( tr_peerIo * io,
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struct evbuffer * outbuf,
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uint32_t writeme )
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{
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uint32_t tmp = htonl( writeme );
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tr_peerIoWriteBytes( io, outbuf, &tmp, sizeof(uint32_t) );
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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_peerIoReadBytes( tr_peerIo * io,
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struct evbuffer * inbuf,
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void * bytes,
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size_t byteCount )
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{
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assert( EVBUFFER_LENGTH( inbuf ) >= byteCount );
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switch( io->encryptionMode )
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{
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case PEER_ENCRYPTION_NONE:
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evbuffer_remove( inbuf, bytes, byteCount );
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break;
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case PEER_ENCRYPTION_RC4:
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evbuffer_remove( inbuf, bytes, byteCount );
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tr_cryptoDecrypt( io->crypto, byteCount, bytes, bytes );
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break;
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default:
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assert( 0 );
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}
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}
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void
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tr_peerIoReadUint8( tr_peerIo * io,
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struct evbuffer * inbuf,
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uint8_t * setme )
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{
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tr_peerIoReadBytes( io, inbuf, setme, sizeof(uint8_t) );
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}
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void
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tr_peerIoReadUint16( tr_peerIo * io,
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struct evbuffer * inbuf,
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uint16_t * setme )
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{
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uint16_t tmp;
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tr_peerIoReadBytes( io, inbuf, &tmp, sizeof(uint16_t) );
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*setme = ntohs( tmp );
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}
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void
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tr_peerIoReadUint32( tr_peerIo * io,
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struct evbuffer * inbuf,
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uint32_t * setme )
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{
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uint32_t tmp;
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tr_peerIoReadBytes( io, inbuf, &tmp, sizeof(uint32_t) );
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*setme = ntohl( tmp );
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}
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void
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tr_peerIoDrain( tr_peerIo * io,
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struct evbuffer * inbuf,
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size_t byteCount )
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{
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uint8_t * tmp = tr_new( uint8_t, byteCount );
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tr_peerIoReadBytes( io, inbuf, tmp, byteCount );
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tr_free( tmp );
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}
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