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/***************************************************************************\
* *
* BitlBee - An IRC to IM gateway *
* Utility functions for file transfer *
* *
* Copyright 2008 Uli Meis <a.sporto+bee@gmail.com> *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License along *
* with this program; if not, write to the Free Software Foundation, Inc., *
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. *
* *
\***************************************************************************/
#define BITLBEE_CORE
#include "bitlbee.h"
#include <poll.h>
#include <netinet/tcp.h>
#include "lib/ftutil.h"
#define ASSERTSOCKOP(op, msg) \
if( (op) == -1 ) {\
g_snprintf( errmsg, sizeof( errmsg ), msg ": %s", strerror( errno ) ); \
return -1; }
/*
* Creates a listening socket and returns it in saddr_ptr.
*/
int ft_listen( struct sockaddr_storage *saddr_ptr, char *host, char *port, int copy_fd, int for_bitlbee_client, char **errptr )
{
int fd, gret, saddrlen;
struct addrinfo hints, *rp;
socklen_t ssize = sizeof( struct sockaddr_storage );
struct sockaddr_storage saddrs, *saddr = &saddrs;
static char errmsg[1024];
char *ftlisten = global.conf->ft_listen;
if( errptr )
*errptr = errmsg;
strcpy( port, "0" );
/* Format is <IP-A>[:<Port-A>];<IP-B>[:<Port-B>] where
* A is for connections with the bitlbee client (DCC)
* and B is for connections with IM peers.
*/
if( ftlisten )
{
char *scolon = strchr( ftlisten, ';' );
char *colon;
if( scolon )
{
if( for_bitlbee_client )
{
*scolon = '\0';
strncpy( host, ftlisten, HOST_NAME_MAX );
*scolon = ';';
}
else
{
strncpy( host, scolon + 1, HOST_NAME_MAX );
}
}
else
{
strncpy( host, ftlisten, HOST_NAME_MAX );
}
if( ( colon = strchr( host, ':' ) ) )
{
*colon = '\0';
strncpy( port, colon + 1, 5 );
}
}
else if( copy_fd >= 0 && getsockname( copy_fd, (struct sockaddr*) &saddrs, &ssize ) == 0 &&
( saddrs.ss_family == AF_INET || saddrs.ss_family == AF_INET6 ) &&
getnameinfo( (struct sockaddr*) &saddrs, ssize, host, HOST_NAME_MAX,
NULL, 0, NI_NUMERICHOST ) == 0 )
{
/* We just took our local address on copy_fd, which is likely to be a
sensible address from which we can do a file transfer now - the
most sensible we can get easily. */
}
else
{
ASSERTSOCKOP( gethostname( host, HOST_NAME_MAX + 1 ), "gethostname()" );
}
memset( &hints, 0, sizeof( struct addrinfo ) );
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_NUMERICSERV;
if ( ( gret = getaddrinfo( host, port, &hints, &rp ) ) != 0 )
{
sprintf( errmsg, "getaddrinfo() failed: %s", gai_strerror( gret ) );
return -1;
}
saddrlen = rp->ai_addrlen;
memcpy( saddr, rp->ai_addr, saddrlen );
freeaddrinfo( rp );
ASSERTSOCKOP( fd = socket( saddr->ss_family, SOCK_STREAM, 0 ), "Opening socket" );
ASSERTSOCKOP( bind( fd, ( struct sockaddr *)saddr, saddrlen ), "Binding socket" );
ASSERTSOCKOP( listen( fd, 1 ), "Making socket listen" );
if ( !inet_ntop( saddr->ss_family, saddr->ss_family == AF_INET ?
( void * )&( ( struct sockaddr_in * ) saddr )->sin_addr.s_addr :
( void * )&( ( struct sockaddr_in6 * ) saddr )->sin6_addr.s6_addr,
host, HOST_NAME_MAX ) )
{
strcpy( errmsg, "inet_ntop failed on listening socket" );
return -1;
}
ssize = sizeof( struct sockaddr_storage );
ASSERTSOCKOP( getsockname( fd, ( struct sockaddr *)saddr, &ssize ), "Getting socket name" );
if( saddr->ss_family == AF_INET )
g_snprintf( port, 6, "%d", ntohs( ( (struct sockaddr_in *) saddr )->sin_port ) );
else
g_snprintf( port, 6, "%d", ntohs( ( (struct sockaddr_in6 *) saddr )->sin6_port ) );
if( saddr_ptr )
memcpy( saddr_ptr, saddr, saddrlen );
/* I hate static-length strings.. */
host[HOST_NAME_MAX] = '\0';
port[5] = '\0';
return fd;
}
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