transmission/libtransmission/net.c

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/******************************************************************************
* $Id$
*
* Copyright (c) 2005-2006 Transmission authors and contributors
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*****************************************************************************/
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#ifndef WIN32
#include <netdb.h>
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#include <fcntl.h>
#endif
#include <evutil.h>
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#include "transmission.h"
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#include "fdlimit.h"
#include "net.h"
#include "platform.h"
#include "utils.h"
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void
tr_netInit( void )
{
static int initialized = FALSE;
if( !initialized )
{
#ifdef WIN32
WSADATA wsaData;
WSAStartup(MAKEWORD(2,2), &wsaData);
#endif
initialized = TRUE;
}
}
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/***********************************************************************
* DNS resolution
*
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* Synchronous "resolution": only works with character strings
* representing numbers expressed in the Internet standard `.' notation.
* Returns a non-zero value if an error occurs.
**********************************************************************/
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int tr_netResolve( const char * address, struct in_addr * addr )
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{
addr->s_addr = inet_addr( address );
return ( addr->s_addr == 0xFFFFFFFF );
}
/***********************************************************************
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* TCP/UDP sockets
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**********************************************************************/
static int
makeSocketNonBlocking( int fd )
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{
if( fd >= 0 )
{
#if defined(__BEOS__)
int flags = 1;
if( setsockopt( fd, SOL_SOCKET, SO_NONBLOCK,
&flags, sizeof( int ) ) < 0 )
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#else
if( evutil_make_socket_nonblocking( fd ) )
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#endif
{
tr_err( "Couldn't set socket to non-blocking mode (%s)",
strerror( sockerrno ) );
tr_netClose( fd );
fd = -1;
}
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}
return fd;
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}
static int
createSocket( int type, int priority )
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{
return makeSocketNonBlocking( tr_fdSocketCreate( type, priority ) );
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}
static int
tr_netOpen( const struct in_addr * addr, tr_port_t port,
int type, int priority )
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{
int s;
struct sockaddr_in sock;
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if( ( s = createSocket( type, priority ) ) < 0 )
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{
return -1;
}
memset( &sock, 0, sizeof( sock ) );
sock.sin_family = AF_INET;
sock.sin_addr.s_addr = addr->s_addr;
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sock.sin_port = port;
if( ( connect( s, (struct sockaddr *) &sock,
sizeof( struct sockaddr_in ) ) < 0 )
#ifdef WIN32
&& ( sockerrno != WSAEWOULDBLOCK )
#endif
&& ( sockerrno != EINPROGRESS ) )
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{
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tr_err( "Couldn't connect socket (%s)", strerror( sockerrno ) );
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tr_netClose( s );
return -1;
}
return s;
}
int
tr_netOpenTCP( const struct in_addr * addr, tr_port_t port, int priority )
{
return tr_netOpen( addr, port, SOCK_STREAM, priority );
}
int
tr_netOpenUDP( const struct in_addr * addr, tr_port_t port, int priority )
{
return tr_netOpen( addr, port, SOCK_DGRAM, priority );
}
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#ifdef IP_ADD_MEMBERSHIP
int tr_netMcastOpen( int port, const struct in_addr * addr )
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{
int fd;
struct ip_mreq req;
fd = tr_netBindUDP( port );
if( 0 > fd )
{
return -1;
}
memset( &req, 0, sizeof( req ) );
req.imr_multiaddr.s_addr = addr->s_addr;
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req.imr_interface.s_addr = htonl( INADDR_ANY );
if( setsockopt( fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, (char*)&req, sizeof ( req ) ) )
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{
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tr_err( "Couldn't join multicast group (%s)", strerror( sockerrno ) );
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tr_netClose( fd );
return -1;
}
return fd;
}
#else /* IP_ADD_MEMBERSHIP */
int tr_netMcastOpen( int port UNUSED, const struct in_addr * addr UNUSED )
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{
return -1;
}
#endif /* IP_ADD_MEMBERSHIP */
static int
tr_netBind( int port, int type )
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{
int s;
struct sockaddr_in sock;
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#if defined( SO_REUSEADDR ) || defined( SO_REUSEPORT )
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int optval;
#endif
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if( ( s = createSocket( type, 1 ) ) < 0 )
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{
return -1;
}
#ifdef SO_REUSEADDR
optval = 1;
setsockopt( s, SOL_SOCKET, SO_REUSEADDR, (char*)&optval, sizeof( optval ) );
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#endif
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#ifdef SO_REUSEPORT
if( SOCK_DGRAM == type )
{
optval = 1;
setsockopt( s, SOL_SOCKET, SO_REUSEPORT, &optval, sizeof( optval ) );
}
#endif
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memset( &sock, 0, sizeof( sock ) );
sock.sin_family = AF_INET;
sock.sin_addr.s_addr = INADDR_ANY;
sock.sin_port = htons( port );
if( bind( s, (struct sockaddr *) &sock,
sizeof( struct sockaddr_in ) ) )
{
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tr_err( "Couldn't bind port %d", port );
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tr_netClose( s );
return -1;
}
return s;
}
int
tr_netBindTCP( int port )
{
return tr_netBind( port, SOCK_STREAM );
}
int
tr_netBindUDP( int port )
{
return tr_netBind( port, SOCK_DGRAM );
}
int
tr_netAccept( int b, struct in_addr * addr, tr_port_t * port )
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{
return makeSocketNonBlocking( tr_fdSocketAccept( b, addr, port ) );
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}
int
tr_netSend( int s, const void * buf, int size )
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{
const int ret = send( s, buf, size, 0 );
if( ret >= 0 )
return ret;
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if( sockerrno == ENOTCONN || sockerrno == EAGAIN || sockerrno == EWOULDBLOCK )
return TR_NET_BLOCK;
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return TR_NET_CLOSE;
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}
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int tr_netRecvFrom( int s, uint8_t * buf, int size, struct sockaddr_in * addr )
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{
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socklen_t len;
int ret;
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len = ( NULL == addr ? 0 : sizeof( *addr ) );
ret = recvfrom( s, buf, size, 0, ( struct sockaddr * ) addr, &len );
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if( ret < 0 )
{
if( sockerrno == EAGAIN || sockerrno == EWOULDBLOCK )
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{
ret = TR_NET_BLOCK;
}
else
{
ret = TR_NET_CLOSE;
}
}
if( !ret )
{
ret = TR_NET_CLOSE;
}
return ret;
}
void
tr_netClose( int s )
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{
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tr_fdSocketClose( s );
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}
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void
tr_netNtop( const struct in_addr * addr, char * buf, int len )
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{
const uint8_t * cast;
cast = (const uint8_t *)addr;
snprintf( buf, len, "%hhu.%hhu.%hhu.%hhu",
cast[0], cast[1], cast[2], cast[3] );
}