/***************************************************************************** * netutils.c: various network functions ***************************************************************************** * Copyright (C) 1999, 2000, 2001 VideoLAN * $Id: netutils.c,v 1.41 2001/11/12 04:12:38 sam Exp $ * * Authors: Vincent Seguin <seguin@via.ecp.fr> * Benoit Steiner <benny@via.ecp.fr> * Henri Fallon <henri@videolan.org> * Xavier Marchesini <xav@via.ecp.fr> * * 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., 59 Temple Place - Suite 330, Boston, MA 02111, USA. *****************************************************************************/ /***************************************************************************** * Preamble *****************************************************************************/ #include "defs.h" #include <stdlib.h> /* free(), realloc(), atoi() */ #include <errno.h> /* errno() */ #include <string.h> /* memset() */ #ifdef STRNCASECMP_IN_STRINGS_H # include <strings.h> #endif #ifdef HAVE_UNISTD_H #include <unistd.h> /* gethostname() */ #elif defined( _MSC_VER ) && defined( _WIN32 ) #include <io.h> #endif #if !defined( _MSC_VER ) #include <sys/time.h> /* gettimeofday */ #endif #if !defined( WIN32 ) #include <netdb.h> /* gethostbyname() */ #include <netinet/in.h> /* BSD: struct in_addr */ #include <sys/socket.h> /* BSD: struct sockaddr */ #endif #ifdef HAVE_ARPA_INET_H #include <arpa/inet.h> /* inet_ntoa(), inet_aton() */ #endif #ifdef SYS_LINUX #include <sys/ioctl.h> /* ioctl() */ #endif #if defined( WIN32 ) /* tools to get the MAC adress from */ #include <windows.h> /* the interface under Windows */ #include <stdio.h> #endif #ifdef HAVE_NET_IF_H #include <net/if.h> /* interface (arch-dependent) */ #endif #ifdef HAVE_SYS_SOCKIO_H #include <sys/sockio.h> #endif #include "config.h" #include "common.h" #include "mtime.h" #include "threads.h" #include "main.h" #include "intf_msg.h" #include "intf_playlist.h" #include "netutils.h" /***************************************************************************** * input_channel_t: channel library data ***************************************************************************** * Store global channel library data. * The part of the code concerning the channel changing process is unstable * as it depends on the VideoLAN channel server, which isn't frozen for * the time being. *****************************************************************************/ typedef struct input_channel_s { int i_channel; /* current channel number */ mtime_t last_change; /* last change date */ } input_channel_t; /***************************************************************************** * Local prototypes *****************************************************************************/ static int GetMacAddress ( int i_fd, char *psz_mac ); #ifdef WIN32 static int GetAdapterInfo ( int i_adapter, char *psz_string ); #endif /***************************************************************************** * network_BuildLocalAddr : fill a sockaddr_in structure for local binding *****************************************************************************/ int network_BuildLocalAddr( struct sockaddr_in * p_socket, int i_port, char * psz_broadcast ) { char psz_hostname[INPUT_MAX_SOURCE_LENGTH]; struct hostent * p_hostent; #if defined( SYS_BEOS ) intf_ErrMsg( "error: channel changing is not yet supported under BeOS" ); return( 1 ); #endif /* Reset struct */ memset( p_socket, 0, sizeof( struct sockaddr_in ) ); p_socket->sin_family = AF_INET; /* family */ p_socket->sin_port = htons( i_port ); if( psz_broadcast == NULL ) { /* Try to get our own IP */ if( gethostname( psz_hostname, sizeof(psz_hostname) ) ) { intf_ErrMsg( "BuildLocalAddr : unable to resolve local name : %s", strerror( errno ) ); return( -1 ); } } else { /* I didn't manage to make INADDR_ANYT work, even with setsockopt * so, as it's kludgy to try and determine the broadcast addr * it is passed as an argument in the command line */ strncpy( psz_hostname, psz_broadcast, INPUT_MAX_SOURCE_LENGTH ); } /* Try to convert address directly from in_addr - this will work if * psz_in_addr is dotted decimal. */ #ifdef HAVE_ARPA_INET_H if( !inet_aton( psz_hostname, &p_socket->sin_addr) ) #else if( (p_socket->sin_addr.s_addr = inet_addr( psz_hostname )) == -1 ) #endif { /* We have a fqdn, try to find its address */ if ( (p_hostent = gethostbyname( psz_hostname )) == NULL ) { intf_ErrMsg( "BuildLocalAddr: unknown host %s", psz_hostname ); return( -1 ); } /* Copy the first address of the host in the socket address */ memcpy( &p_socket->sin_addr, p_hostent->h_addr_list[0], p_hostent->h_length ); } return( 0 ); } /***************************************************************************** * network_BuildRemoteAddr : fill a sockaddr_in structure for remote host *****************************************************************************/ int network_BuildRemoteAddr( struct sockaddr_in * p_socket, char * psz_server ) { struct hostent * p_hostent; #if defined( SYS_BEOS ) intf_ErrMsg( "error: channel changing is not yet supported under BeOS" ); return( 1 ); #endif /* Reset structure */ memset( p_socket, 0, sizeof( struct sockaddr_in ) ); p_socket->sin_family = AF_INET; /* family */ p_socket->sin_port = htons( 0 ); /* This is for remote end */ /* Try to convert address directly from in_addr - this will work if * psz_in_addr is dotted decimal. */ #ifdef HAVE_ARPA_INET_H if( !inet_aton( psz_server, &p_socket->sin_addr) ) #else if( (p_socket->sin_addr.s_addr = inet_addr( psz_server )) == -1 ) #endif { /* We have a fqdn, try to find its address */ if ( (p_hostent = gethostbyname(psz_server)) == NULL ) { intf_ErrMsg( "BuildRemoteAddr: unknown host %s", psz_server ); return( -1 ); } /* Copy the first address of the host in the socket address */ memcpy( &p_socket->sin_addr, p_hostent->h_addr_list[0], p_hostent->h_length ); } return( 0 ); } /***************************************************************************** * network_ChannelCreate: initialize global channel method data ***************************************************************************** * Initialize channel input method global data. This function should be called * once before any input thread is created or any call to other * input_Channel*() function is attempted. *****************************************************************************/ int network_ChannelCreate( void ) { #if defined( SYS_LINUX ) || defined( WIN32 ) /* Allocate structure */ p_main->p_channel = malloc( sizeof( input_channel_t ) ); if( p_main->p_channel == NULL ) { intf_ErrMsg( "network error: could not create channel bank" ); return( -1 ); } /* Initialize structure */ p_main->p_channel->i_channel = 0; p_main->p_channel->last_change = 0; intf_WarnMsg( 2, "network: channels initialized" ); return( 0 ); #else intf_ErrMsg( "network error : channels not supported on this platform" ); return( 1 ); #endif } /***************************************************************************** * network_ChannelJoin: join a channel ***************************************************************************** * This function will try to join a channel. If the relevant interface is * already on the good channel, nothing will be done. Else, and if possible * (if the interface is not locked), the channel server will be contacted * and a change will be requested. The function will block until the change * is effective. Note that once a channel is no more used, its interface * should be unlocked using input_ChannelLeave(). * Non 0 will be returned in case of error. *****************************************************************************/ int network_ChannelJoin( int i_channel ) { #if defined( SYS_LINUX ) || defined( WIN32 ) #define VLCS_VERSION 12 #define MESSAGE_LENGTH 80 char psz_mess[ MESSAGE_LENGTH ]; char psz_mac[ 40 ]; int i_fd, i_dummy, i_port; char *psz_vlcs; struct sockaddr_in sa_server; struct sockaddr_in sa_client; struct timeval delay; fd_set fds; if( !main_GetIntVariable( INPUT_NETWORK_CHANNEL_VAR, INPUT_NETWORK_CHANNEL_DEFAULT ) ) { intf_ErrMsg( "network: channels disabled, to enable them, use the" "--channels option" ); return -1; } /* If last change is too recent, wait a while */ if( mdate() - p_main->p_channel->last_change < INPUT_CHANNEL_CHANGE_DELAY ) { intf_WarnMsg( 2, "network: waiting before changing channel" ); /* XXX Isn't this completely brain-damaged ??? -- Sam */ mwait( p_main->p_channel->last_change + INPUT_CHANNEL_CHANGE_DELAY ); } /* Initializing the socket */ i_fd = socket( AF_INET, SOCK_DGRAM, 0 ); /* Getting information about the channel server */ psz_vlcs = main_GetPszVariable( INPUT_CHANNEL_SERVER_VAR, INPUT_CHANNEL_SERVER_DEFAULT ); i_port = main_GetIntVariable( INPUT_CHANNEL_PORT_VAR, INPUT_CHANNEL_PORT_DEFAULT ); intf_WarnMsg( 6, "network: vlcs '%s', port %d", psz_vlcs, i_port ); memset( &sa_client, 0x00, sizeof(struct sockaddr_in) ); memset( &sa_server, 0x00, sizeof(struct sockaddr_in) ); sa_client.sin_family = AF_INET; sa_server.sin_family = AF_INET; sa_client.sin_port = htons( 4312 ); sa_server.sin_port = htons( i_port ); sa_client.sin_addr.s_addr = INADDR_ANY; #ifdef HAVE_ARPA_INET_H inet_aton( psz_vlcs, &sa_server.sin_addr ); #else sa_server.sin_addr.s_addr = inet_addr( psz_vlcs ); #endif /* Bind the socket */ i_dummy = bind( i_fd, (struct sockaddr *)(&sa_client), sizeof(struct sockaddr) ); if ( i_dummy ) { intf_ErrMsg( "network: unable to bind vlcs socket: %i", i_dummy ); return -1; } /* Look for the interface MAC address */ if( GetMacAddress( i_fd, psz_mac ) ) { intf_ErrMsg( "network error: failed getting MAC address" ); return -1; } intf_WarnMsg( 6, "network: MAC address is %s", psz_mac ); /* Build the message */ sprintf( psz_mess, "%d %u %lu %s \n", i_channel, VLCS_VERSION, (unsigned long)(mdate() / (unsigned long long)1000000), psz_mac ); /* Send the message */ sendto( i_fd, psz_mess, MESSAGE_LENGTH, 0, (struct sockaddr *)(&sa_server), sizeof(struct sockaddr) ); intf_WarnMsg( 2, "network: attempting to join channel %d", i_channel ); /* We have changed channels ! (or at least, we tried) */ p_main->p_channel->last_change = mdate(); p_main->p_channel->i_channel = i_channel; /* Wait 5 sec for an answer from the server */ delay.tv_sec = 5; delay.tv_usec = 0; FD_ZERO( &fds ); FD_SET( i_fd, &fds ); i_dummy = select( i_fd + 1, &fds, NULL, NULL, &delay ); switch( i_dummy ) { case 0: intf_ErrMsg( "network error: no answer from vlcs" ); close( i_fd ); return -1; break; case -1: intf_ErrMsg( "network error: error while listening to vlcs" ); close( i_fd ); return -1; break; } i_dummy = sizeof( struct sockaddr ); recvfrom( i_fd, psz_mess, MESSAGE_LENGTH, 0, (struct sockaddr *)(&sa_client), &i_dummy); psz_mess[ MESSAGE_LENGTH - 1 ] = 0; if( !strncasecmp( psz_mess, "E: ", 3 ) ) { intf_ErrMsg( "network error: vlcs said '%s'", psz_mess + 3 ); close( i_fd ); return -1; } else if( !strncasecmp( psz_mess, "I: ", 3 ) ) { intf_WarnMsg( 2, "network info: vlcs said '%s'", psz_mess + 3 ); } else /* We got something to play ! FIXME: not very nice */ { # define p_item \ (&p_main->p_playlist->p_item[ p_main->p_playlist->i_index + 1]) vlc_mutex_lock( &p_main->p_playlist->change_lock ); free( p_item->psz_name ); p_item->psz_name = strdup( psz_mess ); vlc_mutex_unlock( &p_main->p_playlist->change_lock ); } /* Close the socket and return nicely */ close( i_fd ); return 0; #else intf_ErrMsg( "network error: channels not supported on this platform" ); return NULL; #endif } /* Following functions are local */ /***************************************************************************** * GetMacAddress: extract the MAC Address *****************************************************************************/ static int GetMacAddress( int i_fd, char *psz_mac ) { #if defined( SYS_LINUX ) struct ifreq interface; int i_ret; /* * Looking for information about the eth0 interface */ interface.ifr_addr.sa_family = AF_INET; strcpy( interface.ifr_name, main_GetPszVariable( INPUT_IFACE_VAR, INPUT_IFACE_DEFAULT ) ); i_ret = ioctl( i_fd, SIOCGIFHWADDR, &interface ); if( i_ret ) { intf_ErrMsg( "network error: ioctl SIOCGIFHWADDR failed" ); return( i_ret ); } sprintf( psz_mac, "%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x", interface.ifr_hwaddr.sa_data[0] & 0xff, interface.ifr_hwaddr.sa_data[1] & 0xff, interface.ifr_hwaddr.sa_data[2] & 0xff, interface.ifr_hwaddr.sa_data[3] & 0xff, interface.ifr_hwaddr.sa_data[4] & 0xff, interface.ifr_hwaddr.sa_data[5] & 0xff ); return( 0 ); #elif defined( WIN32 ) int i, i_ret = -1; /* Get adapter list - support for more than one adapter */ LANA_ENUM AdapterList; NCB Ncb; intf_WarnMsg( 2, "network: looking for MAC address" ); memset( &Ncb, 0, sizeof( NCB ) ); Ncb.ncb_command = NCBENUM; Ncb.ncb_buffer = (unsigned char *)&AdapterList; Ncb.ncb_length = sizeof( AdapterList ); Netbios( &Ncb ); /* Get all of the local ethernet addresses */ for ( i = 0; i < AdapterList.length ; ++i ) { if ( GetAdapterInfo ( AdapterList.lana[ i ], psz_mac ) == 0 ) { i_ret = 0; } } return( i_ret ); #else return( -1); #endif } #ifdef WIN32 /***************************************************************************** * GetAdapterInfo : gets some informations about the interface using NETBIOS *****************************************************************************/ static int GetAdapterInfo( int i_adapter, char *psz_string ) { struct ASTAT { ADAPTER_STATUS adapt; NAME_BUFFER psz_name[30]; } Adapter; /* Reset the LAN adapter so that we can begin querying it */ NCB Ncb; memset( &Ncb, 0, sizeof ( Ncb ) ); Ncb.ncb_command = NCBRESET; Ncb.ncb_lana_num = i_adapter; if( Netbios( &Ncb ) != NRC_GOODRET ) { intf_ErrMsg( "network error: reset returned %i", Ncb.ncb_retcode ); return -1; } /* Prepare to get the adapter status block */ memset( &Ncb, 0, sizeof( Ncb ) ) ; /* Initialization */ Ncb.ncb_command = NCBASTAT; Ncb.ncb_lana_num = i_adapter; strcpy( (char *)Ncb.ncb_callname, "*" ); memset( &Adapter, 0, sizeof ( Adapter ) ); Ncb.ncb_buffer = ( unsigned char * ) &Adapter; Ncb.ncb_length = sizeof ( Adapter ); /* Get the adapter's info and, if this works, return it in standard, * colon-delimited form. */ if ( Netbios( &Ncb ) == 0 ) { sprintf ( psz_string, "%02X:%02X:%02X:%02X:%02X:%02X", (int) ( Adapter.adapt.adapter_address[0] ), (int) ( Adapter.adapt.adapter_address[1] ), (int) ( Adapter.adapt.adapter_address[2] ), (int) ( Adapter.adapt.adapter_address[3] ), (int) ( Adapter.adapt.adapter_address[4] ), (int) ( Adapter.adapt.adapter_address[5] ) ); intf_WarnMsg( 2, "network: found MAC address %s", psz_string ); return 0; } else { intf_ErrMsg( "network error: ASTAT returned %i", Ncb.ncb_retcode ); return -1; } } #endif /* WIN32 */