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/********************************************************************\
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* Axel -- A lighter download accelerator for Linux and other Unices. *
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* *
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* Copyright 2001 Wilmer van der Gaast *
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\********************************************************************/
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/* TCP control file */
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/*
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License with
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the Debian GNU/Linux distribution in file /usr/doc/copyright/GPL;
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if not, write to the Free Software Foundation, Inc., 59 Temple Place,
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Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "axel.h"
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/* Get a TCP connection */
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int tcp_connect( char *hostname, int port, char *local_if )
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{
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struct hostent *host = NULL;
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struct sockaddr_in addr;
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struct sockaddr_in local;
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int fd;
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#ifdef DEBUG
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socklen_t i = sizeof( local );
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fprintf( stderr, "tcp_connect( %s, %i ) = ", hostname, port );
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#endif
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/* Why this loop? Because the call might return an empty record.
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At least it very rarely does, on my system... */
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for( fd = 0; fd < 5; fd ++ )
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{
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if( ( host = gethostbyname( hostname ) ) == NULL )
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return( -1 );
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if( *host->h_name ) break;
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}
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if( !host || !host->h_name || !*host->h_name )
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return( -1 );
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if( ( fd = socket( AF_INET, SOCK_STREAM, 0 ) ) == -1 )
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return( -1 );
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if( local_if && *local_if )
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{
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local.sin_family = AF_INET;
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local.sin_port = 0;
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local.sin_addr.s_addr = inet_addr( local_if );
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if( bind( fd, (struct sockaddr *) &local, sizeof( struct sockaddr_in ) ) == -1 )
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{
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close( fd );
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return( -1 );
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}
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}
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addr.sin_family = AF_INET;
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addr.sin_port = htons( port );
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addr.sin_addr = *( (struct in_addr *) host->h_addr );
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if( connect( fd, (struct sockaddr *) &addr, sizeof( struct sockaddr_in ) ) == -1 )
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{
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close( fd );
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return( -1 );
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}
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#ifdef DEBUG
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getsockname( fd, &local, &i );
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fprintf( stderr, "%i\n", ntohs( local.sin_port ) );
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#endif
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return( fd );
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}
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int get_if_ip( char *iface, char *ip )
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{
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struct ifreq ifr;
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int fd = socket( PF_INET, SOCK_DGRAM, IPPROTO_IP );
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memset( &ifr, 0, sizeof( struct ifreq ) );
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strcpy( ifr.ifr_name, iface );
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ifr.ifr_addr.sa_family = AF_INET;
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if( ioctl( fd, SIOCGIFADDR, &ifr ) == 0 )
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{
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struct sockaddr_in *x = (struct sockaddr_in *) &ifr.ifr_addr;
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strcpy( ip, inet_ntoa( x->sin_addr ) );
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return( 1 );
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}
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else
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{
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return( 0 );
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}
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}
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