/***************************************************************************** * netutils.c: various network functions ***************************************************************************** * Copyright (C) 1999, 2000, 2001 VideoLAN * $Id: netutils.c,v 1.32 2001/05/28 02:44:39 sam Exp $ * * Authors: Vincent Seguin * Benoit Steiner * Henri Fallon * Xavier Marchesini * * 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 /* free(), realloc(), atoi() */ #include /* errno() */ #include /* memset() */ #include /* gethostname() */ #include /* gettimeofday */ #ifndef WIN32 #include /* gethostbyname() */ #include /* BSD: struct in_addr */ #include /* BSD: struct sockaddr */ #endif #ifdef HAVE_ARPA_INET_H #include /* inet_ntoa(), inet_aton() */ #endif #ifdef SYS_LINUX #include /* ioctl() */ #endif #ifdef WIN32 /* tools to get the MAC adress from */ #include /* the interface under Windows */ #include #endif #ifdef HAVE_NET_IF_H #include /* interface (arch-dependent) */ #endif #ifdef HAVE_SYS_SOCKIO_H #include #endif #include "config.h" #include "common.h" #include "mtime.h" #include "threads.h" #include "main.h" #include "intf_msg.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_socket, 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; /* 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; /* 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 ) { /* Even when BSD are supported, BeOS is not likely to be supported, so * I prefer to put it apart */ #if defined( SYS_BEOS ) intf_ErrMsg( "error: channel changing is not yet supported under BeOS" ); return( 1 ); #elif defined( SYS_LINUX ) || defined( WIN32 ) /* FIXME : channels handling only work for linux */ /* 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_Msg( "network: channels initialized" ); return( 0 ); #else intf_ErrMsg( "network error : channels not supported" ); 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, it's interface * should be unlocked using input_ChannelLeave(). * Non 0 will be returned in case of error. *****************************************************************************/ int network_ChannelJoin( int i_channel ) { /* I still prefer to put BeOS a bit apart */ #if defined( SYS_BEOS ) intf_ErrMsg( "network error: channels are not yet supported under BeOS" ); return( -1 ); #elif defined( SYS_LINUX ) || defined( WIN32 ) int i_socket; int i_fromlen; struct sockaddr_in sa_server; struct sockaddr_in sa_client; unsigned int i_version = 12; char psz_mess[ 80 ]; char psz_mac[ 40 ]; char i_mess_length = 80; unsigned long int i_date; struct timeval answer_delay; int i_nbanswer; char i_answer; fd_set fd; unsigned int i_rc; if( ! p_main->b_channels ) { intf_ErrMsg( "network: channels disabled, to enable them, use the" "--channels option" ); return( -1 ); } /* debug */ intf_DbgMsg( "network: ChannelJoin : %d", i_channel ); /* If last change is too recent, wait a while */ if( mdate() - p_main->p_channel->last_change < INPUT_CHANNEL_CHANGE_DELAY ) { intf_Msg( "network: waiting before changing channel" ); mwait( p_main->p_channel->last_change + INPUT_CHANNEL_CHANGE_DELAY ); } p_main->p_channel->last_change = mdate(); p_main->p_channel->i_channel = i_channel; intf_Msg( "network: joining channel %d", i_channel ); /* * Initializing the socket */ i_socket = socket( AF_INET, SOCK_DGRAM, 0 ); /* * Getting the server's information */ memset( &sa_server, 0x00, sizeof(struct sockaddr_in) ); sa_server.sin_family = AF_INET; sa_server.sin_port = htons( INPUT_CHANNEL_PORT_DEFAULT ); #ifdef HAVE_ARPA_INET_H if( !inet_aton( psz_server, &p_socket->sin_addr) ) #else if( (sa_server.sin_addr.s_addr = inet_addr( INPUT_CHANNEL_SERVER_DEFAULT )) == -1 ) #endif /* * Looking for the interface MAC address */ if( GetMacAddress( i_socket, psz_mac ) ) { intf_ErrMsg( "network error: failed getting MAC address" ); return( -1 ); } /* * Getting date of the client in seconds */ i_date = mdate() / 1000000; intf_DbgMsg( "vlcs: date %lu", i_date ); /* * Build of the message */ sprintf( psz_mess, "%d %u %lu %s \n", i_channel, i_version, i_date, psz_mac ); intf_DbgMsg( "vlcs: The message is %s", psz_mess ); /* * Open the socket 2 */ memset( &sa_client, 0x00, sizeof(struct sockaddr_in) ); sa_client.sin_family = AF_INET; sa_client.sin_port = htons(4312); sa_client.sin_addr.s_addr = INADDR_ANY; i_fromlen = sizeof( struct sockaddr ); i_rc = bind( i_socket, (struct sockaddr *)(&sa_client),\ sizeof(struct sockaddr) ); if ( i_rc ) { intf_ErrMsg( "vlcs: Unable to bind socket:%u ", i_rc ); /* TODO put CS_R_BIND in types.h*/ /* return CS_R_SOCKET;*/ return -1; } /* * Send the message */ sendto( i_socket, psz_mess, i_mess_length, 0, \ (struct sockaddr *)(&sa_server), \ sizeof(struct sockaddr) ); /* * Waiting 5 sec for one answer from the server */ answer_delay.tv_sec = 5; answer_delay.tv_usec = 0; FD_ZERO( &fd ); FD_SET( i_socket, &fd ); i_nbanswer = select( i_socket + 1, &fd, NULL, NULL, &answer_delay ); switch( i_nbanswer ) { case 0: intf_DbgMsg( "vlcs: no answer" ); break; case -1: intf_DbgMsg( "vlcs: unable to receive the answer "); break; default: recvfrom( i_socket, &i_answer, sizeof(char), 0,\ (struct sockaddr *)(&sa_client), &i_fromlen); intf_DbgMsg( "vlcs: the answer : %i", i_answer ); switch( i_answer ) { case -1: intf_DbgMsg( "vlcs: the server failed to create the thread" ); break; case 0: intf_DbgMsg( "vlcs: the server tries to change the channel" ); break; default: intf_DbgMsg( "vlcs: unknown answer !" ); break; } break; } /* * Close the socket */ close( i_socket ); return( 0 ); #else intf_ErrMsg( "network error: channels not supported" ); return( -1 ); #endif } /* Following functions are local */ /***************************************************************************** * GetMacAddress: extract the MAC Address *****************************************************************************/ static int GetMacAddress( int i_socket, 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, INPUT_IFACE_DEFAULT ); i_ret = ioctl( i_socket, 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 ); #elif 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 */