1 /*****************************************************************************
2 * netutils.c: various network functions
3 *****************************************************************************
4 * Copyright (C) 1999, 2000, 2001 VideoLAN
5 * $Id: netutils.c,v 1.29 2001/05/07 04:42:42 sam 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 <stdlib.h> /* free(), realloc(), atoi() */
32 #include <errno.h> /* errno() */
33 #include <string.h> /* bzero(), bcopy() */
34 #include <unistd.h> /* gethostname() */
35 #include <sys/time.h> /* gettimeofday */
38 #include <netdb.h> /* gethostbyname() */
39 #include <netinet/in.h> /* BSD: struct in_addr */
40 #include <sys/socket.h> /* BSD: struct sockaddr */
43 #ifdef HAVE_ARPA_INET_H
44 #include <arpa/inet.h> /* inet_ntoa(), inet_aton() */
48 #include <sys/ioctl.h> /* ioctl() */
52 #include <net/if.h> /* interface (arch-dependent) */
55 #ifdef HAVE_SYS_SOCKIO_H
56 #include <sys/sockio.h>
71 /*****************************************************************************
72 * input_channel_t: channel library data
73 *****************************************************************************
74 * Store global channel library data.
75 * The part of the code concerning the channel changing process is unstable
76 * as it depends on the VideoLAN channel server, which isn't frozen for
78 *****************************************************************************/
79 typedef struct input_channel_s
81 int i_channel_id; /* current channel number */
82 mtime_t last_change; /* last change date */
86 /*****************************************************************************
87 * network_BuildLocalAddr : fill a sockaddr_in structure for local binding
88 *****************************************************************************/
89 int network_BuildLocalAddr( struct sockaddr_in * p_socket, int i_port,
90 char * psz_broadcast )
92 char psz_hostname[INPUT_MAX_SOURCE_LENGTH];
93 struct hostent * p_hostent;
96 memset( p_socket, 0, sizeof( struct sockaddr_in ) );
97 p_socket->sin_family = AF_INET; /* family */
98 p_socket->sin_port = htons( i_port );
99 if( psz_broadcast == NULL )
101 /* Try to get our own IP */
102 if( gethostname( psz_hostname, sizeof(psz_hostname) ) )
104 intf_ErrMsg( "BuildLocalAddr : unable to resolve local name : %s",
112 /* I didn't manage to make INADDR_ANYT work, even with setsockopt
113 * so, as it's kludgy to try and determine the broadcast addr
114 * it is passed as an argument in the command line */
115 strncpy( psz_hostname, psz_broadcast, INPUT_MAX_SOURCE_LENGTH );
118 /* Try to convert address directly from in_addr - this will work if
119 * psz_in_addr is dotted decimal. */
120 #ifdef HAVE_ARPA_INET_H
121 if( !inet_aton( psz_hostname, &p_socket->sin_addr) )
123 if( (p_socket->sin_addr.s_addr = inet_addr( psz_hostname )) == -1 )
126 /* We have a fqdn, try to find its address */
127 if ( (p_hostent = gethostbyname( psz_hostname )) == NULL )
129 intf_ErrMsg( "BuildLocalAddr: unknown host %s", psz_hostname );
133 /* Copy the first address of the host in the socket address */
134 memcpy( &p_socket->sin_addr, p_hostent->h_addr_list[0],
135 p_hostent->h_length );
140 /*****************************************************************************
141 * network_BuildRemoteAddr : fill a sockaddr_in structure for remote host
142 *****************************************************************************/
143 int network_BuildRemoteAddr( struct sockaddr_in * p_socket, char * psz_server )
145 struct hostent * p_hostent;
147 /* Reset structure */
148 memset( p_socket, 0, sizeof( struct sockaddr_in ) );
149 p_socket->sin_family = AF_INET; /* family */
150 p_socket->sin_port = htons( 0 ); /* This is for remote end */
152 /* Try to convert address directly from in_addr - this will work if
153 * psz_in_addr is dotted decimal. */
155 #ifdef HAVE_ARPA_INET_H
156 if( !inet_aton( psz_server, &p_socket->sin_addr) )
158 if( (p_socket->sin_addr.s_addr = inet_addr( psz_server )) == -1 )
161 /* We have a fqdn, try to find its address */
162 if ( (p_hostent = gethostbyname(psz_server)) == NULL )
164 intf_ErrMsg( "BuildRemoteAddr: unknown host %s",
169 /* Copy the first address of the host in the socket address */
170 memcpy( &p_socket->sin_addr, p_hostent->h_addr_list[0],
171 p_hostent->h_length );
176 /*****************************************************************************
177 * network_ChannelCreate: initialize global channel method data
178 *****************************************************************************
179 * Initialize channel input method global data. This function should be called
180 * once before any input thread is created or any call to other
181 * input_Channel*() function is attempted.
182 *****************************************************************************/
183 int network_ChannelCreate( void )
185 /* Even when BSD are supported, BeOS is not likely to be supported, so
186 * I prefer to put it apart */
187 #if defined( SYS_BEOS )
188 intf_ErrMsg( "error: channel changing is not yet supported under BeOS" );
191 #elif defined( SYS_LINUX )
192 /* FIXME : channels handling only work for linux */
193 /* Allocate structure */
194 p_main->p_channel = malloc( sizeof( input_channel_t ) );
195 if( p_main->p_channel == NULL )
197 intf_ErrMsg("error: %s\n", strerror(ENOMEM));
201 /* Initialize structure */
202 p_main->p_channel->i_channel_id = 0;
203 p_main->p_channel->last_change = 0;
205 intf_Msg("Channels initialized\n");
209 intf_ErrMsg( "error : channel changing only works with linux yest" );
215 /*****************************************************************************
216 * network_ChannelJoin: join a channel
217 *****************************************************************************
218 * This function will try to join a channel. If the relevant interface is
219 * already on the good channel, nothing will be done. Else, and if possible
220 * (if the interface is not locked), the channel server will be contacted
221 * and a change will be requested. The function will block until the change
222 * is effective. Note that once a channel is no more used, it's interface
223 * should be unlocked using input_ChannelLeave().
224 * Non 0 will be returned in case of error.
225 *****************************************************************************/
226 int network_ChannelJoin( int i_channel_id )
228 /* I still prefer to put BeOS a bit apart */
229 #if defined( SYS_BEOS )
230 intf_ErrMsg( "Channels are not yet supported under BeOS" );
233 #elif defined( SYS_LINUX )
236 struct ifreq s_interface;
237 struct sockaddr_in sa_server;
238 struct sockaddr_in sa_client;
239 unsigned int i_version = 12;
241 char i_mess_length = 80;
242 struct timeval * p_date_cl;
243 struct timeval s_time;
244 long unsigned int i_date;
250 if( ! p_main->b_channels )
252 intf_ErrMsg( "Channels disabled. To enable them, use the --channels"
257 intf_DbgMsg( "ChannelJoin : %d", i_channel_id );
258 /* If last change is too recent, wait a while */
259 if( mdate() - p_main->p_channel->last_change < INPUT_CHANNEL_CHANGE_DELAY )
261 intf_Msg( "Waiting before changing channel...\n" );
262 mwait( p_main->p_channel->last_change + INPUT_CHANNEL_CHANGE_DELAY );
264 p_main->p_channel->last_change = mdate();
265 p_main->p_channel->i_channel_id = i_channel_id;
267 intf_Msg( "Joining channel %d\n", i_channel_id );
270 * Looking for information about the eth0 interface
272 s_interface.ifr_addr.sa_family = AF_INET;
273 strcpy( s_interface.ifr_name, INPUT_IFACE_DEFAULT );
277 * Initialysing the socket
279 i_socket_cl=socket( AF_INET, SOCK_DGRAM, 0 );
283 * Getting the server's information
285 bzero( &sa_server, sizeof(struct sockaddr_in) );
286 sa_server.sin_family = AF_INET;
287 sa_server.sin_port = htons( INPUT_CHANNEL_PORT_DEFAULT );
288 inet_aton( INPUT_CHANNEL_SERVER_DEFAULT, &(sa_server.sin_addr) );
291 * Looking for the interface MAC address
293 ioctl( i_socket_cl, SIOCGIFHWADDR, &s_interface );
295 "CHANNELSERVER: macaddr == %2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x\n",
296 s_interface.ifr_hwaddr.sa_data[0] & 0xff,
297 s_interface.ifr_hwaddr.sa_data[1] & 0xff,
298 s_interface.ifr_hwaddr.sa_data[2] & 0xff,
299 s_interface.ifr_hwaddr.sa_data[3] & 0xff,
300 s_interface.ifr_hwaddr.sa_data[4] & 0xff,
301 s_interface.ifr_hwaddr.sa_data[5] & 0xff );
304 * Getting date of the client
306 p_date_cl=malloc( sizeof(struct timeval) );
307 if( p_date_cl == NULL )
309 intf_ErrMsg( "CHANNELSERVER: unable to allocate memory\n" );
310 /* return VS_R_MEMORY;*/
314 if ( gettimeofday( p_date_cl, 0 ) == -1 )
318 i_date = p_date_cl->tv_sec;
320 intf_DbgMsg( "CHANNELSERVER: date %lu\n", i_date );
324 * Build of the message
326 sprintf( psz_mess, "%d %u %lu %2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x \n",
327 i_channel_id, i_version, i_date,
328 s_interface.ifr_hwaddr.sa_data[0] & 0xff,
329 s_interface.ifr_hwaddr.sa_data[1] & 0xff,
330 s_interface.ifr_hwaddr.sa_data[2] & 0xff,
331 s_interface.ifr_hwaddr.sa_data[3] & 0xff,
332 s_interface.ifr_hwaddr.sa_data[4] & 0xff,
333 s_interface.ifr_hwaddr.sa_data[5] & 0xff );
335 intf_DbgMsg( "CHANNELSERVER: The message is %s\n", psz_mess );
340 bzero( &sa_client, sizeof(struct sockaddr_in) );
341 sa_client.sin_family = AF_INET;
342 sa_client.sin_port = htons(4312);
343 sa_client.sin_addr.s_addr = INADDR_ANY;
344 i_fromlen = sizeof( struct sockaddr );
345 i_rc = bind( i_socket_cl, (struct sockaddr *)(&sa_client),\
346 sizeof(struct sockaddr) );
349 intf_ErrMsg( "CHANNELSERVER: Unable to bind socket:%u\n", i_rc );
350 /* TODO put CS_R_BIND in types.h*/
351 /* return CS_R_SOCKET;*/
359 sendto( i_socket_cl, psz_mess, i_mess_length, 0, \
360 (struct sockaddr *)(&sa_server), \
361 sizeof(struct sockaddr) );
364 * Waiting 5 sec for one answer from the server
369 FD_SET( i_socket_cl, &s_rfds );
370 i_nbanswer = select( i_socket_cl+1, &s_rfds, NULL, NULL, &s_time );
371 if( i_nbanswer == 0 )
373 intf_DbgMsg( "CHANNELSERVER: no answer\n" );
375 else if( i_nbanswer == -1 )
377 intf_DbgMsg( "CHANNELSERVER: Unable to receive the answer\n ");
381 recvfrom( i_socket_cl, &i_answer, sizeof(char), 0,\
382 (struct sockaddr *)(&sa_client), &i_fromlen);
383 intf_DbgMsg( "CHANNELSERVER: the answer : %hhd\n", i_answer );
387 "CHANNELSERVER: The server failed to create the thread\n" );
389 else if( i_answer == 0 )
392 "CHANNELSERVER: The server tries to change the channel\n" );
396 intf_DbgMsg( "CHANNELSERVER: Unknown answer !\n" );
403 close( i_socket_cl );
408 intf_ErrMsg( "Channels only work under linux yet" );