minidlna/tivo_beacon.c

/*
 * Linux/C based server for TiVo Home Media Option protocol
 *
 * Based on version 1.5.1 of
 *    "TiVo Connect Automatic Machine; Discovery Protocol Specification"
 * Based on version 1.1.0 of
 *    "TiVo Home Media Option; Music and Photos Server Protocol Specification"
 *
 * Dave Clemans, April 2003
 *
 * Copyright (C) 2003  Dave Clemans
 *
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 * 
 * See the file "COPYING" for more details.
 */
#include "config.h"
#ifdef ENABLE_TIVO
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <sys/wait.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <time.h>

#include <sys/param.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <sys/poll.h>
#include <netdb.h>

#include "tivo_beacon.h"
#include "upnpglobalvars.h"
#include "log.h"

static struct aBeacon* topBeacon = NULL;

/* OpenAndConfHTTPSocket() :
 * setup the socket used to handle incoming HTTP connections. */
int
OpenAndConfTivoBeaconSocket()
{
	int s;
	int i = 1;
	struct sockaddr_in beacon;

	if( (s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
	{
		DPRINTF(E_ERROR, L_TIVO, "socket(http): %s\n", strerror(errno));
		return -1;
	}

	if(setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i)) < 0)
	{
		DPRINTF(E_WARN, L_TIVO, "setsockopt(http, SO_REUSEADDR): %s\n", strerror(errno));
	}

	memset(&beacon, 0, sizeof(struct sockaddr_in));
	beacon.sin_family = AF_INET;
	beacon.sin_port = htons(2190);
	beacon.sin_addr.s_addr = htonl(INADDR_ANY);

	if(bind(s, (struct sockaddr *)&beacon, sizeof(struct sockaddr_in)) < 0)
	{
		DPRINTF(E_ERROR, L_TIVO, "bind(http): %s\n", strerror(errno));
		close(s);
		return -1;
	}
	i = 1;
	if(setsockopt(s, SOL_SOCKET, SO_BROADCAST, &i, sizeof(i)) < 0 )
	{
		DPRINTF(E_WARN, L_TIVO, "setsockopt(http, SO_BROADCAST): %s\n", strerror(errno));
		close(s);
		return -1;
	}

	return s;
}

/*
 * Returns the interface broadcast address to be used for beacons
 */
uint32_t getBcastAddress( void )
{
	struct ifreq        ifr;
	struct sockaddr_in *sin;
	int                 s, rval;

	s = socket( AF_INET, SOCK_DGRAM, 0 );
	if ( s < 0 )
	{
		return INADDR_BROADCAST;
	}

	strcpy( ifr.ifr_name, "eth0" );
	rval = ioctl( s, SIOCGIFBRDADDR, &ifr );
	if ( rval < 0 )
	{
		close(s);
		return INADDR_BROADCAST;
	}

	sin = (struct sockaddr_in *)&ifr.ifr_broadaddr;
	close(s);
	DPRINTF(E_DEBUG, L_TIVO, "Interface: %s broadcast addr %s \n", "eth0", inet_ntoa(sin->sin_addr) );

	return ntohl((uint32_t)(sin->sin_addr.s_addr));
}

/*
 * Send outgoing beacon to the specified address
 * This will either be a specific or broadcast address
 */
void
sendBeaconMessage(int fd, struct sockaddr_in * client, int len, int broadcast)
{
	char * mesg;
	int mesg_len;

	mesg_len = asprintf(&mesg, "TiVoConnect=1\n"
	                           "swversion=%s\n"
	                           "method=%s\n"
	                           "identity=%s\n"
	                           "machine=%s\n"
	                           "platform=pc/minidlna\n"
	                           "services=TiVoMediaServer:%d/http\n",
	                           "1.0",
	                           broadcast ? "broadcast" : "connected",
	                           uuidvalue, friendly_name, runtime_vars.port);
	DPRINTF(E_DEBUG, L_TIVO, "Sending TiVo beacon\n");
	sendto(fd, mesg, mesg_len, 0, (struct sockaddr*)client, len);
	free(mesg);
}

/*
 * Parse and save a received beacon packet from another server, or from
 * a TiVo.
 *
 * Returns true if this was a broadcast beacon msg
 */
int
rcvBeaconMessage(char * beacon)
{
	char * tivoConnect = NULL;
	char * swVersion = NULL;
	char * method = NULL;
	char * identity = NULL;
	char * machine = NULL;
	char * platform = NULL;
	char * services = NULL;
	char * cp;
	char * scp;
	char * tokptr;
	struct aBeacon * b;
	int len;
	time_t current;
	char buf[32];
	static time_t lastSummary = 0;

	cp = strtok_r( beacon, "=\r\n", &tokptr );
	while( cp != NULL )
	{
		scp = cp;
		cp = strtok_r( NULL, "=\r\n", &tokptr );
		if( strcasecmp( scp, "tivoconnect" ) == 0 )
			tivoConnect = cp;
		else if( strcasecmp( scp, "swversion" ) == 0 )
			swVersion = cp;
		else if( strcasecmp( scp, "method" ) == 0 )
			method = cp;
		else if( strcasecmp( scp, "identity" ) == 0 )
			identity = cp;
		else if( strcasecmp( scp, "machine" ) == 0 )
			machine = cp;
		else if( strcasecmp( scp, "platform" ) == 0 )
			platform = cp;
		else if( strcasecmp( scp, "services" ) == 0 )
			services = cp;
		cp = strtok_r( NULL, "=\r\n", &tokptr );
	}

	if( tivoConnect == NULL )
		return 0;

	current = time( NULL );
	for( b = topBeacon; b != NULL; b = b->next )
	{
		if( strcasecmp( machine, b->machine ) == 0 ||
		    strcasecmp( identity, b->identity ) == 0 )
		{
			break;
		}
	}
	if( b == NULL )
	{
		b = ( struct aBeacon* ) calloc( 1, sizeof( *b ) );
		b->next = NULL;

		if ( machine )
		{
			b->machine = ( char* ) malloc( strlen( machine ) + 1 );
			strcpy( b->machine, machine );
		}
		if ( identity )
		{
			b->identity = ( char* ) malloc( strlen( identity ) + 1 );
			strcpy( b->identity, identity );
		}
		if ( swVersion )
		{
			b->swversion = ( char* ) malloc( strlen( swVersion ) + 1 );
			strcpy( b->swversion, swVersion );
		}
		if ( method )
		{
			b->method = ( char* ) malloc( strlen( method ) + 1 );
			strcpy( b->method, method );
		}
		if ( platform )
		{
			b->platform = ( char* ) malloc( strlen( platform ) + 1 );
			strcpy( b->platform, platform );
		}
		if ( services )
		{
			b->services = ( char* ) malloc( strlen( services ) + 1 );
			strcpy( b->services, services );
		}

		b->next = topBeacon;
		topBeacon = b;

		printf( "Received new beacon: machine(%s) platform(%s) services(%s)\n", 
		         b->machine ? b->machine : "-",
		         b->platform ? b->platform : "-", 
		         b->services ? b->services : "-" );
	}
	b->lastSeen = current;

	if( lastSummary == 0 )
		lastSummary = current;
	if( lastSummary + 1800 < current )
	{  /* Give a summary of received server beacons every half hour or so */
		len = 0;
		for( b = topBeacon; b != NULL; b = b->next )
		{
			len += strlen( b->machine ) + 32;
		}
		scp = ( char* ) malloc( len + 128 );
		strcpy( scp, "Known servers: " );
		for( b = topBeacon; b != NULL; b = b->next )
		{
			strcat( scp, b->machine );
			sprintf( buf, "(%ld)", current - b->lastSeen );
			strcat( scp, buf );
			if( b->next != NULL )
				strcat( scp, "," );
		}
		strcat(scp, "\n");
		printf("%s\n", scp);
		free(scp);
		lastSummary = current;
	}

	if( strcasecmp( method, "broadcast" ) == 0 )
		return 1;
	return 0;
}
#endif // ENABLE_TIVO