1 /*****************************************************************************
2 * netutils.c: various network functions
3 *****************************************************************************
4 * Copyright (C) 1999, 2000, 2001 VideoLAN
5 * $Id: netutils.c,v 1.27 2001/04/27 18:07:57 henri Exp $
7 * Authors: Vincent Seguin <seguin@via.ecp.fr>
8 * Benoit Steiner <benny@via.ecp.fr>
9 * Henri Fallon <henri@videolan.org>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
24 *****************************************************************************/
26 /*****************************************************************************
28 *****************************************************************************/
31 #include <netdb.h> /* gethostbyname() */
32 #include <stdlib.h> /* free(), realloc(), atoi() */
33 #include <errno.h> /* errno() */
34 #include <string.h> /* bzero(), bcopy() */
35 #include <unistd.h> /* gethostname() */
36 #include <sys/time.h> /* gettimeofday */
38 #include <netinet/in.h> /* BSD: struct in_addr */
39 #include <sys/socket.h> /* BSD: struct sockaddr */
40 #ifdef HAVE_ARPA_INET_H
41 #include <arpa/inet.h> /* inet_ntoa(), inet_aton() */
45 #include <sys/ioctl.h> /* ioctl() */
49 #include <net/if.h> /* interface (arch-dependent) */
52 #ifdef HAVE_SYS_SOCKIO_H
53 #include <sys/sockio.h>
68 /*****************************************************************************
69 * input_channel_t: channel library data
70 *****************************************************************************
71 * Store global channel library data.
72 * The part of the code concerning the channel changing process is unstable
73 * as it depends on the VideoLAN channel server, which isn't frozen for
75 *****************************************************************************/
76 typedef struct input_channel_s
78 int i_channel_id; /* current channel number */
79 mtime_t last_change; /* last change date */
83 /*****************************************************************************
84 * network_BuildLocalAddr : fill a sockaddr_in structure for local binding
85 *****************************************************************************/
86 int network_BuildLocalAddr( struct sockaddr_in * p_socket, int i_port,
87 char * psz_broadcast )
89 char psz_hostname[INPUT_MAX_SOURCE_LENGTH];
90 struct hostent * p_hostent;
93 memset( p_socket, 0, sizeof( struct sockaddr_in ) );
94 p_socket->sin_family = AF_INET; /* family */
95 p_socket->sin_port = htons( i_port );
96 if( psz_broadcast == NULL )
98 /* Try to get our own IP */
99 if( gethostname( psz_hostname, sizeof(psz_hostname) ) )
101 intf_ErrMsg( "BuildLocalAddr : unable to resolve local name : %s",
109 /* I didn't manage to make INADDR_ANYT work, even with setsockopt
110 * so, as it's kludgy to try and determine the broadcast addr
111 * it is passed as an argument in the command line */
112 strncpy( psz_hostname, psz_broadcast, INPUT_MAX_SOURCE_LENGTH );
115 /* Try to convert address directly from in_addr - this will work if
116 * psz_in_addr is dotted decimal. */
117 #ifdef HAVE_ARPA_INET_H
118 if( !inet_aton( psz_hostname, &p_socket->sin_addr) )
120 if( (p_socket->sin_addr.s_addr = inet_addr( psz_hostname )) == -1 )
123 /* We have a fqdn, try to find its address */
124 if ( (p_hostent = gethostbyname( psz_hostname )) == NULL )
126 intf_ErrMsg( "BuildLocalAddr: unknown host %s", psz_hostname );
130 /* Copy the first address of the host in the socket address */
131 memcpy( &p_socket->sin_addr, p_hostent->h_addr_list[0],
132 p_hostent->h_length );
137 /*****************************************************************************
138 * network_BuildRemoteAddr : fill a sockaddr_in structure for remote host
139 *****************************************************************************/
140 int network_BuildRemoteAddr( struct sockaddr_in * p_socket, char * psz_server )
142 struct hostent * p_hostent;
144 /* Reset structure */
145 memset( p_socket, 0, sizeof( struct sockaddr_in ) );
146 p_socket->sin_family = AF_INET; /* family */
147 p_socket->sin_port = htons( 0 ); /* This is for remote end */
149 /* Try to convert address directly from in_addr - this will work if
150 * psz_in_addr is dotted decimal. */
152 #ifdef HAVE_ARPA_INET_H
153 if( !inet_aton( psz_server, &p_socket->sin_addr) )
155 if( (p_socket->sin_addr.s_addr = inet_addr( psz_server )) == -1 )
158 /* We have a fqdn, try to find its address */
159 if ( (p_hostent = gethostbyname(psz_server)) == NULL )
161 intf_ErrMsg( "BuildRemoteAddr: unknown host %s",
166 /* Copy the first address of the host in the socket address */
167 memcpy( &p_socket->sin_addr, p_hostent->h_addr_list[0],
168 p_hostent->h_length );
173 /*****************************************************************************
174 * network_ChannelCreate: initialize global channel method data
175 *****************************************************************************
176 * Initialize channel input method global data. This function should be called
177 * once before any input thread is created or any call to other
178 * input_Channel*() function is attempted.
179 *****************************************************************************/
180 int network_ChannelCreate( void )
182 /* Even when BSD are supported, BeOS is not likely to be supported, so
183 * I prefer to put it apart */
184 #if defined( SYS_BEOS )
185 intf_ErrMsg( "error: channel changing is not yet supported under BeOS" );
188 #elif defined( SYS_LINUX )
189 /* FIXME : channels handling only work for linux */
190 /* Allocate structure */
191 p_main->p_channel = malloc( sizeof( input_channel_t ) );
192 if( p_main->p_channel == NULL )
194 intf_ErrMsg("error: %s\n", strerror(ENOMEM));
198 /* Initialize structure */
199 p_main->p_channel->i_channel_id = 0;
200 p_main->p_channel->last_change = 0;
202 intf_Msg("Channels initialized\n");
206 intf_ErrMsg( "error : channel changing only works with linux yest" );
212 /*****************************************************************************
213 * network_ChannelJoin: join a channel
214 *****************************************************************************
215 * This function will try to join a channel. If the relevant interface is
216 * already on the good channel, nothing will be done. Else, and if possible
217 * (if the interface is not locked), the channel server will be contacted
218 * and a change will be requested. The function will block until the change
219 * is effective. Note that once a channel is no more used, it's interface
220 * should be unlocked using input_ChannelLeave().
221 * Non 0 will be returned in case of error.
222 *****************************************************************************/
223 int network_ChannelJoin( int i_channel_id )
225 /* I still prefer to put BeOS a bit apart */
226 #if defined( SYS_BEOS )
227 intf_ErrMsg( "Channels are not yet supported under BeOS" );
230 #elif defined( SYS_LINUX )
233 struct ifreq s_interface;
234 struct sockaddr_in sa_server;
235 struct sockaddr_in sa_client;
236 unsigned int i_version = 12;
238 char i_mess_length = 80;
239 struct timeval * p_date_cl;
240 struct timeval s_time;
241 long unsigned int i_date;
247 if( ! p_main->b_channels )
249 intf_ErrMsg( "Channels disabled. To enable them, use the --channels"
254 intf_DbgMsg( "ChannelJoin : %d", i_channel_id );
255 /* If last change is too recent, wait a while */
256 if( mdate() - p_main->p_channel->last_change < INPUT_CHANNEL_CHANGE_DELAY )
258 intf_Msg( "Waiting before changing channel...\n" );
259 mwait( p_main->p_channel->last_change + INPUT_CHANNEL_CHANGE_DELAY );
261 p_main->p_channel->last_change = mdate();
262 p_main->p_channel->i_channel_id = i_channel_id;
264 intf_Msg( "Joining channel %d\n", i_channel_id );
267 * Looking for information about the eth0 interface
269 s_interface.ifr_addr.sa_family = AF_INET;
270 strcpy( s_interface.ifr_name, INPUT_IFACE_DEFAULT );
274 * Initialysing the socket
276 i_socket_cl=socket( AF_INET, SOCK_DGRAM, 0 );
280 * Getting the server's information
282 bzero( &sa_server, sizeof(struct sockaddr_in) );
283 sa_server.sin_family = AF_INET;
284 sa_server.sin_port = htons( INPUT_CHANNEL_PORT_DEFAULT );
285 inet_aton( INPUT_CHANNEL_SERVER_DEFAULT, &(sa_server.sin_addr) );
288 * Looking for the interface MAC address
290 ioctl( i_socket_cl, SIOCGIFHWADDR, &s_interface );
292 "CHANNELSERVER: macaddr == %2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x\n",
293 s_interface.ifr_hwaddr.sa_data[0] & 0xff,
294 s_interface.ifr_hwaddr.sa_data[1] & 0xff,
295 s_interface.ifr_hwaddr.sa_data[2] & 0xff,
296 s_interface.ifr_hwaddr.sa_data[3] & 0xff,
297 s_interface.ifr_hwaddr.sa_data[4] & 0xff,
298 s_interface.ifr_hwaddr.sa_data[5] & 0xff );
301 * Getting date of the client
303 p_date_cl=malloc( sizeof(struct timeval) );
304 if( p_date_cl == NULL )
306 intf_ErrMsg( "CHANNELSERVER: unable to allocate memory\n" );
307 /* return VS_R_MEMORY;*/
311 if ( gettimeofday( p_date_cl, 0 ) == -1 )
315 i_date = p_date_cl->tv_sec;
317 intf_DbgMsg( "CHANNELSERVER: date %lu\n", i_date );
321 * Build of the message
323 sprintf( psz_mess, "%d %u %lu %2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x \n",
324 i_channel_id, i_version, i_date,
325 s_interface.ifr_hwaddr.sa_data[0] & 0xff,
326 s_interface.ifr_hwaddr.sa_data[1] & 0xff,
327 s_interface.ifr_hwaddr.sa_data[2] & 0xff,
328 s_interface.ifr_hwaddr.sa_data[3] & 0xff,
329 s_interface.ifr_hwaddr.sa_data[4] & 0xff,
330 s_interface.ifr_hwaddr.sa_data[5] & 0xff );
332 intf_DbgMsg( "CHANNELSERVER: The message is %s\n", psz_mess );
337 bzero( &sa_client, sizeof(struct sockaddr_in) );
338 sa_client.sin_family = AF_INET;
339 sa_client.sin_port = htons(4312);
340 sa_client.sin_addr.s_addr = INADDR_ANY;
341 i_fromlen = sizeof( struct sockaddr );
342 i_rc = bind( i_socket_cl, (struct sockaddr *)(&sa_client),\
343 sizeof(struct sockaddr) );
346 intf_ErrMsg( "CHANNELSERVER: Unable to bind socket:%u\n", i_rc );
347 /* TODO put CS_R_BIND in types.h*/
348 /* return CS_R_SOCKET;*/
356 sendto( i_socket_cl, psz_mess, i_mess_length, 0, \
357 (struct sockaddr *)(&sa_server), \
358 sizeof(struct sockaddr) );
361 * Waiting 5 sec for one answer from the server
366 FD_SET( i_socket_cl, &s_rfds );
367 i_nbanswer = select( i_socket_cl+1, &s_rfds, NULL, NULL, &s_time );
368 if( i_nbanswer == 0 )
370 intf_DbgMsg( "CHANNELSERVER: no answer\n" );
372 else if( i_nbanswer == -1 )
374 intf_DbgMsg( "CHANNELSERVER: Unable to receive the answer\n ");
378 recvfrom( i_socket_cl, &i_answer, sizeof(char), 0,\
379 (struct sockaddr *)(&sa_client), &i_fromlen);
380 intf_DbgMsg( "CHANNELSERVER: the answer : %hhd\n", i_answer );
384 "CHANNELSERVER: The server failed to create the thread\n" );
386 else if( i_answer == 0 )
389 "CHANNELSERVER: The server tries to change the channel\n" );
393 intf_DbgMsg( "CHANNELSERVER: Unknown answer !\n" );
400 close( i_socket_cl );
405 intf_ErrMsg( "Channels only work under linux yet" );