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