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vdr-plugin-iptv/protocoludp.c

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2007-09-14 17:44:25 +02:00
/*
* streamer.c: IPTV plugin for the Video Disk Recorder
*
* See the README file for copyright information and how to reach the author.
*
* $Id: protocoludp.c,v 1.1 2007/09/14 15:44:25 rahrenbe Exp $
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <fcntl.h>
#include <unistd.h>
#include "common.h"
#include "protocoludp.h"
cIptvProtocolUdp::cIptvProtocolUdp()
: streamPort(1234),
socketDesc(-1),
mcastActive(false)
{
debug("cIptvProtocolUdp::cIptvProtocolUdp()\n");
streamAddr = strdup("");
}
cIptvProtocolUdp::~cIptvProtocolUdp()
{
debug("cIptvProtocolUdp::~cIptvProtocolUdp()\n");
// Drop the multicast group and close the socket
Close();
// Free allocated memory
free(streamAddr);
}
bool cIptvProtocolUdp::OpenSocket(const int Port)
{
debug("cIptvProtocolUdp::OpenSocket()\n");
// If socket is there already and it is bound to a different port, it must
// be closed first
if (Port != streamPort) {
debug("cIptvProtocolUdp::OpenSocket(): Socket tear-down\n");
CloseSocket();
}
// Bind to the socket if it is not active already
if (socketDesc < 0) {
int yes = 1;
// Create socket
socketDesc = socket(PF_INET, SOCK_DGRAM, 0);
if (socketDesc < 0) {
char tmp[64];
error("ERROR: socket(): %s", strerror_r(errno, tmp, sizeof(tmp)));
return false;
}
// Make it use non-blocking I/O to avoid stuck read calls
if (fcntl(socketDesc, F_SETFL, O_NONBLOCK)) {
char tmp[64];
error("ERROR: fcntl(): %s", strerror_r(errno, tmp, sizeof(tmp)));
CloseSocket();
return false;
}
// Allow multiple sockets to use the same PORT number
if (setsockopt(socketDesc, SOL_SOCKET, SO_REUSEADDR, &yes,
sizeof(yes)) < 0) {
char tmp[64];
error("ERROR: setsockopt(): %s", strerror_r(errno, tmp, sizeof(tmp)));
CloseSocket();
return false;
}
// Bind socket
memset(&sockAddr, '\0', sizeof(sockAddr));
sockAddr.sin_family = AF_INET;
sockAddr.sin_port = htons(Port);
sockAddr.sin_addr.s_addr = htonl(INADDR_ANY);
int err = bind(socketDesc, (struct sockaddr *)&sockAddr, sizeof(sockAddr));
if (err < 0) {
char tmp[64];
error("ERROR: bind(): %s", strerror_r(errno, tmp, sizeof(tmp)));
CloseSocket();
return false;
}
// Update stream port
streamPort = Port;
}
return true;
}
void cIptvProtocolUdp::CloseSocket(void)
{
debug("cIptvProtocolUdp::CloseSocket()\n");
// Check if socket exists
if (socketDesc >= 0) {
close(socketDesc);
socketDesc = -1;
}
}
bool cIptvProtocolUdp::JoinMulticast(void)
{
debug("cIptvProtocolUdp::JoinMulticast()\n");
// Check that stream address is valid
if (!mcastActive && !isempty(streamAddr)) {
// Ensure that socket is valid
OpenSocket(streamPort);
// Join a new multicast group
struct ip_mreq mreq;
mreq.imr_multiaddr.s_addr = inet_addr(streamAddr);
mreq.imr_interface.s_addr = htonl(INADDR_ANY);
int err = setsockopt(socketDesc, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq,
sizeof(mreq));
if (err < 0) {
char tmp[64];
error("ERROR: setsockopt(): %s", strerror_r(errno, tmp, sizeof(tmp)));
return false;
}
// Update multicasting flag
mcastActive = true;
}
return true;
}
bool cIptvProtocolUdp::DropMulticast(void)
{
debug("cIptvProtocolUdp::DropMulticast()\n");
// Check that stream address is valid
if (mcastActive && !isempty(streamAddr)) {
// Ensure that socket is valid
OpenSocket(streamPort);
// Drop the multicast group
struct ip_mreq mreq;
mreq.imr_multiaddr.s_addr = inet_addr(streamAddr);
mreq.imr_interface.s_addr = htonl(INADDR_ANY);
int err = setsockopt(socketDesc, IPPROTO_IP, IP_DROP_MEMBERSHIP, &mreq,
sizeof(mreq));
if (err < 0) {
char tmp[64];
error("ERROR: setsockopt(): %s", strerror_r(errno, tmp, sizeof(tmp)));
return false;
}
// Update multicasting flag
mcastActive = false;
}
return true;
}
int cIptvProtocolUdp::Read(unsigned char *Buffer, int Len)
{
//debug("cIptvProtocolUdp::Read()\n");
socklen_t addrlen = sizeof(sockAddr);
// Wait for data
struct timeval tv;
tv.tv_sec = 0;
tv.tv_usec = 500000;
// Use select
fd_set rfds;
FD_ZERO(&rfds);
FD_SET(socketDesc, &rfds);
int retval = select(socketDesc + 1, &rfds, NULL, NULL, &tv);
// Check if error
if (retval < 0) {
char tmp[64];
error("ERROR: select(): %s", strerror_r(errno, tmp, sizeof(tmp)));
return -1;
}
// Check if data available
else if (retval) {
// Read data from socket
return recvfrom(socketDesc, Buffer, Len, MSG_DONTWAIT,
(struct sockaddr *)&sockAddr, &addrlen);
}
return 0;
}
bool cIptvProtocolUdp::Open(void)
{
debug("cIptvProtocolUdp::Open(): streamAddr = %s\n", streamAddr);
// Join a new multicast group
JoinMulticast();
return true;
}
bool cIptvProtocolUdp::Close(void)
{
debug("cIptvProtocolUdp::Close(): streamAddr = %s\n", streamAddr);
// Drop the multicast group
DropMulticast();
// Close the socket
CloseSocket();
return true;
}
bool cIptvProtocolUdp::Set(const char* Address, const int Port)
{
debug("cIptvProtocolUdp::Set(): %s:%d\n", Address, Port);
if (!isempty(Address)) {
// Drop the multicast group
DropMulticast();
// Update stream address and port
streamAddr = strcpyrealloc(streamAddr, Address);
streamPort = Port;
// Join a new multicast group
JoinMulticast();
}
return true;
}