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vdr-plugin-iptv
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vdr-plugin-iptv/protocolhttp.c

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/*
* protocolhttp.c: IPTV plugin for the Video Disk Recorder
*
* See the README file for copyright information and how to reach the author.
*
* $Id: protocolhttp.c,v 1.9 2007/09/29 16:21:05 rahrenbe Exp $
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <vdr/device.h>
#include "common.h"
#include "config.h"
#include "protocolhttp.h"
cIptvProtocolHttp::cIptvProtocolHttp()
: streamPort(3000),
socketDesc(-1),
readBufferLen(TS_SIZE * IptvConfig.GetReadBufferTsCount()),
isActive(false)
{
debug("cIptvProtocolHttp::cIptvProtocolHttp()\n");
streamAddr = strdup("");
streamPath = strdup("/");
// Allocate receive buffer
readBuffer = MALLOC(unsigned char, readBufferLen);
if (!readBuffer)
error("ERROR: MALLOC() failed in ProtocolHttp()");
}
cIptvProtocolHttp::~cIptvProtocolHttp()
{
debug("cIptvProtocolHttp::~cIptvProtocolHttp()\n");
// Close the socket
Close();
// Free allocated memory
free(streamPath);
free(streamAddr);
free(readBuffer);
}
bool cIptvProtocolHttp::OpenSocket(const int Port)
{
debug("cIptvProtocolHttp::OpenSocket()\n");
// If socket is there already and it is bound to a different port, it must
// be closed first
if (Port != streamPort) {
debug("cIptvProtocolHttp::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_STREAM, 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;
}
// Create default socket
memset(&sockAddr, '\0', sizeof(sockAddr));
sockAddr.sin_family = AF_INET;
sockAddr.sin_port = htons(Port);
sockAddr.sin_addr.s_addr = htonl(INADDR_ANY);
// Update stream port
streamPort = Port;
}
return true;
}
void cIptvProtocolHttp::CloseSocket(void)
{
debug("cIptvProtocolHttp::CloseSocket()\n");
// Check if socket exists
if (socketDesc >= 0) {
close(socketDesc);
socketDesc = -1;
}
}
bool cIptvProtocolHttp::Connect(void)
{
debug("cIptvProtocolHttp::Connect()\n");
// Check that stream address is valid
if (!isActive && !isempty(streamAddr) && !isempty(streamPath)) {
// Ensure that socket is valid
OpenSocket(streamPort);
// First try only the IP address
sockAddr.sin_addr.s_addr = inet_addr(streamAddr);
if (sockAddr.sin_addr.s_addr == INADDR_NONE) {
debug("Cannot convert %s directly to internet address\n", streamAddr);
// It may be a host name, get the name
struct hostent *host;
host = gethostbyname(streamAddr);
if (!host) {
error("%s is not valid address\n", streamAddr);
char tmp[64];
error("ERROR: %s", strerror_r(h_errno, tmp, sizeof(tmp)));
return false;
}
sockAddr.sin_addr.s_addr = inet_addr(*host->h_addr_list);
}
int err = connect(socketDesc, (struct sockaddr*)&sockAddr,
sizeof(sockAddr));
// Non-blocking sockets always report in-progress error when connected
if (err < 0 && errno != EINPROGRESS) {
char tmp[64];
error("ERROR: Connect(): %s", strerror_r(errno, tmp, sizeof(tmp)));
CloseSocket();
return false;
}
// Select on the socket completion
struct timeval tv;
tv.tv_sec = 1;
tv.tv_usec = 0;
// Use select to check socket writability
fd_set wfds;
FD_ZERO(&wfds);
FD_SET(socketDesc, &wfds);
int retval = select(socketDesc + 1, NULL, &wfds, NULL, &tv);
// Check if error
if (retval < 0) {
char tmp[64];
error("ERROR: select(): %s", strerror_r(errno, tmp, sizeof(tmp)));
return -1;
}
// Select has returned. Get socket errors if there are any
int socketStatus = 0;
socklen_t len = sizeof(socketStatus);
getsockopt(socketDesc, SOL_SOCKET, SO_ERROR, &socketStatus, &len);
// If not any errors, then socket must be ready and connected
if (socketStatus != 0) {
error("Cannot connect to %s\n", streamAddr);
char tmp[64];
error("ERROR: %s", strerror_r(socketStatus, tmp, sizeof(tmp)));
CloseSocket();
return false;
}
// Formulate and send HTTP request
char buffer[256];
memset(buffer, '\0', sizeof(buffer));
snprintf(buffer, sizeof(buffer),
"GET %s HTTP/1.1\r\n"
"Host: %s\r\n"
"User-Agent: vdr-iptv\r\n"
"Range: bytes=0-\r\n"
"Connection: Close\r\n"
"\r\n", streamPath, streamAddr);
//debug("Sending http request: %s\n", buffer);
err = send(socketDesc, buffer, strlen(buffer), 0);
if (err < 0) {
char tmp[64];
error("ERROR: send(): %s", strerror_r(errno, tmp, sizeof(tmp)));
CloseSocket();
return false;
}
// Now process headers
if (!ProcessHeaders()) {
CloseSocket();
return false;
}
// Update active flag
isActive = true;
}
return true;
}
bool cIptvProtocolHttp::Disconnect(void)
{
debug("cIptvProtocolHttp::Disconnect()\n");
// Check that stream address is valid
if (isActive) {
// Close the socket
CloseSocket();
// Update active flag
isActive = false;
}
return true;
}
bool cIptvProtocolHttp::GetHeaderLine(char* dest, unsigned int destLen,
unsigned int &recvLen)
{
debug("cIptvProtocolHttp::GetHeaderLine()\n");
bool linefeed = false;
bool newline = false;
char buf[256];
char *bufptr = buf;
memset(buf, '\0', sizeof(buf));
recvLen = 0;
while (!newline || !linefeed) {
socklen_t addrlen = sizeof(sockAddr);
// Set argument point to read buffer
// 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 false;
}
// Check if data available
else if (retval) {
int retval = recvfrom(socketDesc, bufptr, 1, MSG_DONTWAIT,
(struct sockaddr *)&sockAddr, &addrlen);
if (retval <= 0)
return false;
// Parsing end conditions, if line ends with \r\n
if (linefeed && *bufptr == '\n')
newline = true;
// First occurrence of \r seen
else if (*bufptr == '\r')
linefeed = true;
// Saw just data or \r without \n
else {
linefeed = false;
++recvLen;
}
++bufptr;
// Check that buffers won't be exceeded
if (recvLen >= sizeof(buf) || recvLen >= destLen) {
error("Header wouldn't fit into buffer\n");
return false;
}
}
else {
error("No HTTP response received\n");
return false;
}
}
memcpy(dest, buf, recvLen);
return true;
}
bool cIptvProtocolHttp::ProcessHeaders(void)
{
debug("cIptvProtocolHttp::ProcessHeaders()\n");
unsigned int lineLength = 0;
int response = 0;
bool responseFound = false;
char buf[256];
while (!responseFound || lineLength != 0) {
memset(buf, '\0', sizeof(buf));
if (!GetHeaderLine(buf, sizeof(buf), lineLength))
return false;
if (!responseFound && sscanf(buf, "HTTP/1.%*i %i ",&response) != 1) {
error("Expected HTTP header not found\n");
continue;
}
else
responseFound = true;
if (response != 200) {
error("ERROR: %s\n", buf);
return false;
}
}
return true;
}
int cIptvProtocolHttp::Read(unsigned char* *BufferAddr)
{
//debug("cIptvProtocolHttp::Read()\n");
socklen_t addrlen = sizeof(sockAddr);
// Set argument point to read buffer
*BufferAddr = readBuffer;
// 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, readBuffer, readBufferLen, MSG_DONTWAIT,
(struct sockaddr *)&sockAddr, &addrlen);
}
return 0;
}
bool cIptvProtocolHttp::Open(void)
{
debug("cIptvProtocolHttp::Open(): streamAddr=%s\n", streamAddr);
// Connect the socket
return Connect();
}
bool cIptvProtocolHttp::Close(void)
{
debug("cIptvProtocolHttp::Close(): streamAddr=%s\n", streamAddr);
// Disconnect the current stream
Disconnect();
return true;
}
bool cIptvProtocolHttp::Set(const char* Address, const int Port)
{
debug("cIptvProtocolHttp::Set(): %s:%d\n", Address, Port);
if (!isempty(Address)) {
// Disconnect the current socket
Disconnect();
// Update stream address, path and port
streamAddr = strcpyrealloc(streamAddr, Address);
char *path = strstr(streamAddr, "/");
if (path) {
streamPath = strcpyrealloc(streamPath, path);
*path = 0;
}
else
streamPath = strcpyrealloc(streamPath, "/");
streamPort = Port;
debug("iptv://%s:%d%s\n", streamAddr, streamPort, streamPath);
// Re-connect the socket
Connect();
}
return true;
}
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