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/*
* vdrdiscovery.c
*
* Simple broadcast protocol to search VDR with xineliboutput server
* from (local) network.
*
* See the main source file 'xineliboutput.c' for copyright information and
* how to reach the author.
*
* $Id: vdrdiscovery.c,v 1.2 2007-01-01 08:11:51 phintuka Exp $
*
*/
#include <stdlib.h>
#include <stdio.h>
#include <poll.h>
#include <unistd.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/un.h>
#ifdef FE_STANDALONE
# define LOG_MODULENAME "[discovery] "
#else
# define LogToSysLog 1
#endif
#define NEED_x_syslog
#include "../logdefs.h"
#include "vdrdiscovery.h"
/*
*
*/
#ifndef DISCOVERY_PORT
# define DISCOVERY_PORT 37890
#endif
/* discovery protocol strings (v1.0) */
#define DISCOVERY_1_0_HDR "VDR xineliboutput DISCOVERY 1.0" "\r\n"
#define DISCOVERY_1_0_CLI "Client: %s:%d" "\r\n"
#define DISCOVERY_1_0_SVR "Server port: %d" "\r\n"
#define DISCOVERY_1_0_VERSION "Server version: " /*vdr-" VDRVERSION "\r\n\t"*/ \
"xineliboutput-" XINELIBOUTPUT_VERSION "\r\n"
/*
*
*/
static inline int discovery_init(int port)
{
int fd_discovery = -1;
struct sockaddr_in sin;
if ((fd_discovery = socket(PF_INET, SOCK_DGRAM, 0/*IPPROTO_TCP*/)) < 0) {
LOGERR("socket() failed (UDP discovery)");
} else {
int iBroadcast = 1, iReuse = 1;
if(setsockopt(fd_discovery, SOL_SOCKET, SO_BROADCAST, &iBroadcast, sizeof(int)) < 0)
LOGERR("setsockopt(SO_BROADCAST) failed");
if(setsockopt(fd_discovery, SOL_SOCKET, SO_REUSEADDR, &iReuse, sizeof(int)) < 0)
LOGERR("setsockopt(SO_REUSEADDR) failed");
sin.sin_family = AF_INET;
sin.sin_port = htons(port);
sin.sin_addr.s_addr = htonl(INADDR_BROADCAST);
if (bind(fd_discovery, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
LOGERR("bind() failed (UDP discovery)");
} else {
return fd_discovery;
}
}
close(fd_discovery);
return -1;
}
#ifndef FE_STANDALONE
int udp_discovery_init(void)
{
return discovery_init(DISCOVERY_PORT);
}
#endif
static inline int udp_discovery_send(int fd_discovery, int port, char *msg)
{
struct sockaddr_in sin;
int len = strlen(msg);
sin.sin_family = AF_INET;
sin.sin_port = htons(port);
sin.sin_addr.s_addr = INADDR_BROADCAST;
if(len != sendto(fd_discovery, msg, len, 0,
(struct sockaddr *)&sin, sizeof(sin))) {
LOGERR("UDP broadcast send failed (discovery)");
return -1;
}
//LOGDBG("UDP broadcast send succeed (discovery)");
return 0;
}
#ifndef FE_STANDALONE
int udp_discovery_broadcast(int fd_discovery, int server_port)
{
char *msg = NULL;
int result;
asprintf(&msg,
DISCOVERY_1_0_HDR //"VDR xineliboutput DISCOVERY 1.0" "\r\n"
DISCOVERY_1_0_SVR //"Server port: %d" "\r\n"
DISCOVERY_1_0_VERSION //"Server version: xineliboutput-" XINELIBOUTPUT_VERSION "\r\n"
"\r\n",
server_port);
result = udp_discovery_send(fd_discovery, DISCOVERY_PORT, msg);
free(msg);
return result;
}
#else
static inline int udp_discovery_search(int fd_discovery, int port)
{
char *msg = NULL;
int result;
asprintf(&msg,
DISCOVERY_1_0_HDR /* "VDR xineliboutput DISCOVERY 1.0" "\r\n" */
DISCOVERY_1_0_CLI /* "Client: %s:%d" "\r\n" */
"\r\n",
"255.255.255.255",
port);
result = udp_discovery_send(fd_discovery, port, msg);
free(msg);
return result;
}
#endif
#ifdef FE_STANDALONE
static
#endif
int udp_discovery_recv(int fd_discovery, char *buf, int timeout,
struct sockaddr_in *source)
{
socklen_t sourcelen = sizeof(struct sockaddr_in);
struct pollfd pfd;
int err;
pfd.fd = fd_discovery;
pfd.events = POLLIN;
errno = 0;
err = poll(&pfd, 1, timeout);
if(err < 1) {
if(err < 0)
LOGERR("broadcast poll error");
return err;
}
memset(source, 0, sourcelen);
memset(buf, 0, DISCOVERY_MSG_MAXSIZE);
err = recvfrom(fd_discovery, buf, DISCOVERY_MSG_MAXSIZE-1, 0,
(struct sockaddr *)source, &sourcelen);
if(err <= 0)
LOGDBG("fd_discovery recvfrom() error");
return err;
}
#ifndef FE_STANDALONE
int udp_discovery_is_valid_search(const char *buf)
{
const char *id_string = DISCOVERY_1_0_HDR "Client:";
if(!strncmp(id_string, buf, strlen(id_string))) {
LOGMSG("Received valid discovery message %s", buf);
return 1;
}
LOGDBG("BROADCAST: %s", buf);
return 0;
}
#else
int udp_discovery_find_server(int *port, char *address)
{
static const char *mystring = DISCOVERY_1_0_HDR "Server port: ";
struct sockaddr_in from;
char buf[DISCOVERY_MSG_MAXSIZE];
int fd_discovery = -1;
int trycount = 0;
int err = 0;
*port = DISCOVERY_PORT;
strcpy(address, "vdr");
if((fd_discovery = discovery_init(DISCOVERY_PORT)) < 0)
return 0;
while(err >= 0 && ++trycount < 4) {
if((err = udp_discovery_search(fd_discovery, DISCOVERY_PORT) >= 0)) {
errno = 0;
while( (err = udp_discovery_recv(fd_discovery, buf, 500, &from)) > 0) {
uint32_t tmp = ntohl(from.sin_addr.s_addr);
buf[err] = 0;
LOGDBG("Reveived broadcast: %d bytes from %d.%d.%d.%d \n%s",
err,
((tmp>>24)&0xff), ((tmp>>16)&0xff),
((tmp>>8)&0xff), ((tmp)&0xff),
buf);
if(!strncmp(mystring, buf, strlen(mystring))) {
LOGDBG("Valid discovery message");
close(fd_discovery);
sprintf(address, "%d.%d.%d.%d",
((tmp>>24)&0xff), ((tmp>>16)&0xff),
((tmp>>8)&0xff), ((tmp)&0xff));
if(1 == sscanf(buf + strlen(mystring), "%d", port))
return 1;
} else {
LOGDBG("NOT valid discovery message");
}
}
}
}
/* failed */
close(fd_discovery);
return 0;
}
#endif
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