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vdr-plugin-iptv/protocolext.c

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/*
* protocolext.c: IPTV plugin for the Video Disk Recorder
*
* See the README file for copyright information and how to reach the author.
*
*/
#include <sys/wait.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <fcntl.h>
#include <unistd.h>
#include <vdr/device.h>
#include <vdr/plugin.h>
#include "common.h"
#include "config.h"
#include "protocolext.h"
cIptvProtocolExt::cIptvProtocolExt()
: pid(-1),
scriptFile(""),
scriptParameter(0)
{
debug("cIptvProtocolExt::cIptvProtocolExt()\n");
}
cIptvProtocolExt::~cIptvProtocolExt()
{
debug("cIptvProtocolExt::~cIptvProtocolExt()\n");
// Drop the socket connection
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cIptvProtocolExt::Close();
}
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void cIptvProtocolExt::ExecuteScript(void)
{
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debug("cIptvProtocolExt::ExecuteScript()\n");
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// Check if already executing
if (isActive || isempty(scriptFile))
return;
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if (pid > 0) {
error("Cannot execute script!");
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return;
}
// Let's fork
ERROR_IF_RET((pid = fork()) == -1, "fork()", return);
// Check if child process
if (pid == 0) {
// Close all dup'ed filedescriptors
int MaxPossibleFileDescriptors = getdtablesize();
for (int i = STDERR_FILENO + 1; i < MaxPossibleFileDescriptors; i++)
close(i);
// Execute the external script
cString cmd = cString::sprintf("%s %d %d", *scriptFile, scriptParameter, socketPort);
debug("cIptvProtocolExt::ExecuteScript(child): %s\n", *cmd);
if (execl("/bin/bash", "sh", "-c", *cmd, (char *)NULL) == -1) {
error("Script execution failed: %s", *cmd);
_exit(-1);
}
_exit(0);
}
else {
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debug("cIptvProtocolExt::ExecuteScript(): pid=%d\n", pid);
}
}
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void cIptvProtocolExt::TerminateScript(void)
{
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debug("cIptvProtocolExt::TerminateScript(): pid=%d\n", pid);
if (!isActive || isempty(scriptFile))
return;
if (pid > 0) {
const unsigned int timeoutms = 100;
unsigned int waitms = 0;
siginfo_t waitStatus;
bool waitOver = false;
// signal and wait for termination
int retval = kill(pid, SIGINT);
ERROR_IF_RET(retval < 0, "kill()", waitOver = true);
while (!waitOver) {
retval = 0;
waitms += timeoutms;
if ((waitms % 2000) == 0) {
error("Script '%s' won't terminate - killing it!", *scriptFile);
kill(pid, SIGKILL);
}
// Clear wait status to make sure child exit status is accessible
memset(&waitStatus, '\0', sizeof(waitStatus));
// Wait for child termination
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retval = waitid(P_PID, pid, &waitStatus, (WNOHANG | WEXITED));
ERROR_IF_RET(retval < 0, "waitid()", waitOver = true);
// These are the acceptable conditions under which child exit is
// regarded as successful
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if (!retval && waitStatus.si_pid && (waitStatus.si_pid == pid) &&
((waitStatus.si_code == CLD_EXITED) || (waitStatus.si_code == CLD_KILLED))) {
debug("Child (%d) exited as expected\n", pid);
waitOver = true;
}
// Unsuccessful wait, avoid busy looping
if (!waitOver)
cCondWait::SleepMs(timeoutms);
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}
pid = -1;
}
}
bool cIptvProtocolExt::Open(void)
{
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debug("cIptvProtocolExt::Open()\n");
// Reject empty script files
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if (!strlen(*scriptFile))
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return false;
// Create the listening socket
OpenSocket(socketPort);
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// Execute the external script
ExecuteScript();
isActive = true;
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return true;
}
bool cIptvProtocolExt::Close(void)
{
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debug("cIptvProtocolExt::Close()\n");
// Terminate the external script
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TerminateScript();
isActive = false;
// Close the socket
CloseSocket();
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return true;
}
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int cIptvProtocolExt::Read(unsigned char* BufferAddr, unsigned int BufferLen)
{
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return cIptvUdpSocket::Read(BufferAddr, BufferLen);
}
bool cIptvProtocolExt::Set(const char* Location, const int Parameter, const int Index)
{
debug("cIptvProtocolExt::Set(): Location=%s Parameter=%d Index=%d\n", Location, Parameter, Index);
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if (!isempty(Location)) {
struct stat stbuf;
// Update script file and parameter
scriptFile = cString::sprintf("%s/%s", IptvConfig.GetConfigDirectory(), Location);
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if ((stat(*scriptFile, &stbuf) != 0) || (strstr(*scriptFile, "..") != 0)) {
error("Non-existent or relative path script '%s'", *scriptFile);
return false;
}
scriptParameter = Parameter;
// Update listen port
socketPort = IptvConfig.GetExtProtocolBasePort() + Index;
}
return true;
}
cString cIptvProtocolExt::GetInformation(void)
{
//debug("cIptvProtocolExt::GetInformation()");
return cString::sprintf("ext://%s:%d", *scriptFile, scriptParameter);
}