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vdr-plugin-streamdev/remux/extern.c

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#include "remux/extern.h"
#include "server/server.h"
#include "server/connection.h"
#include "server/streamer.h"
#include <vdr/channels.h>
#include <vdr/remux.h>
#include <vdr/tools.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <signal.h>
#include <unistd.h>
#include <stdlib.h>
namespace Streamdev {
#define MAXENV 63
class cTSExt: public cThread {
private:
cRingBufferLinear *m_ResultBuffer;
bool m_Active;
int m_Process;
int m_Inpipe, m_Outpipe;
protected:
virtual void Action(void);
public:
cTSExt(cRingBufferLinear *ResultBuffer, const cServerConnection *Connection, const cChannel *Channel, const cPatPmtParser *PatPmt, const int *Apids, const int *Dpids);
virtual ~cTSExt();
void Put(const uchar *Data, int Count);
};
} // namespace Streamdev
using namespace Streamdev;
cTSExt::cTSExt(cRingBufferLinear *ResultBuffer, const cServerConnection *Connection, const cChannel *Channel, const cPatPmtParser *PatPmt, const int *Apids, const int *Dpids):
m_ResultBuffer(ResultBuffer),
m_Active(false),
m_Process(-1),
m_Inpipe(0),
m_Outpipe(0)
{
int inpipe[2];
int outpipe[2];
if (pipe(inpipe) == -1) {
LOG_ERROR_STR("pipe failed");
return;
}
if (pipe(outpipe) == -1) {
LOG_ERROR_STR("pipe failed");
close(inpipe[0]);
close(inpipe[1]);
return;
}
if ((m_Process = fork()) == -1) {
LOG_ERROR_STR("fork failed");
close(inpipe[0]);
close(inpipe[1]);
close(outpipe[0]);
close(outpipe[1]);
return;
}
if (m_Process == 0) {
// child process
char *env[MAXENV + 1];
int i = 0;
#define ADDENV(x...) if (asprintf(&env[i++], x) < 0) i--
// add channel ID, name and pids to environment
if (Channel) {
ADDENV("REMUX_CHANNEL_ID=%s", *Channel->GetChannelID().ToString());
ADDENV("REMUX_CHANNEL_NAME=%s", Channel->Name());
ADDENV("REMUX_VTYPE=%d", Channel->Vtype());
if (Channel->Vpid())
ADDENV("REMUX_VPID=%d", Channel->Vpid());
if (Channel->Ppid() != Channel->Vpid())
ADDENV("REMUX_PPID=%d", Channel->Ppid());
if (Channel->Tpid())
ADDENV("REMUX_TPID=%d", Channel->Tpid());
}
else if (PatPmt) {
ADDENV("REMUX_VTYPE=%d", PatPmt->Vtype());
if (PatPmt->Vpid())
ADDENV("REMUX_VPID=%d", PatPmt->Vpid());
if (PatPmt->Ppid() != PatPmt->Vpid())
ADDENV("REMUX_PPID=%d", PatPmt->Ppid());
}
std::string buffer;
if (Apids && *Apids) {
for (const int *pid = Apids; *pid; pid++)
(buffer += (const char *) itoa(*pid)) += (*(pid + 1) ? " " : "");
ADDENV("REMUX_APID=%s", buffer.c_str());
buffer.clear();
for (const int *pid = Apids; *pid; pid++) {
int j;
if (Channel) {
for (j = 0; Channel->Apid(j) && Channel->Apid(j) != *pid; j++)
;
(buffer += Channel->Alang(j)) += (*(pid + 1) ? " " : "");
}
else if (PatPmt) {
for (j = 0; PatPmt->Apid(j) && PatPmt->Apid(j) != *pid; j++)
;
(buffer += PatPmt->Alang(j)) += (*(pid + 1) ? " " : "");
}
}
ADDENV("REMUX_ALANG=%s", buffer.c_str());
}
if (Dpids && *Dpids) {
buffer.clear();
for (const int *pid = Dpids; *pid; pid++)
(buffer += (const char *) itoa(*pid)) += (*(pid + 1) ? " " : "");
ADDENV("REMUX_DPID=%s", buffer.c_str());
buffer.clear();
for (const int *pid = Dpids; *pid; pid++) {
int j;
if (Channel) {
for (j = 0; Channel->Dpid(j) && Channel->Dpid(j) != *pid; j++)
;
(buffer += Channel->Dlang(j)) += (*(pid + 1) ? " " : "");
}
else if (PatPmt) {
for (j = 0; PatPmt->Dpid(j) && PatPmt->Dpid(j) != *pid; j++)
;
(buffer += PatPmt->Dlang(j)) += (*(pid + 1) ? " " : "");
}
}
ADDENV("REMUX_DLANG=%s", buffer.c_str());
}
if (Channel && Channel->Spid(0)) {
buffer.clear();
for (const int *pid = Channel->Spids(); *pid; pid++)
(buffer += (const char *) itoa(*pid)) += (*(pid + 1) ? " " : "");
ADDENV("REMUX_SPID=%s", buffer.c_str());
buffer.clear();
for (int j = 0; Channel->Spid(j); j++)
(buffer += Channel->Slang(j)) += (Channel->Spid(j + 1) ? " " : "");
ADDENV("REMUX_SLANG=%s", buffer.c_str());
}
else if (PatPmt && PatPmt->Spid(0)) {
buffer.clear();
for (const int *pid = PatPmt->Spids(); *pid; pid++)
(buffer += (const char *) itoa(*pid)) += (*(pid + 1) ? " " : "");
ADDENV("REMUX_SPID=%s", buffer.c_str());
buffer.clear();
for (int j = 0; PatPmt->Spid(j); j++)
(buffer += PatPmt->Slang(j)) += (PatPmt->Spid(j + 1) ? " " : "");
ADDENV("REMUX_SLANG=%s", buffer.c_str());
}
if (Connection) {
// add vars for a CGI like interface
// the following vars are not implemented:
// REMOTE_HOST, REMOTE_IDENT, REMOTE_USER
// CONTENT_TYPE, CONTENT_LENGTH,
// SCRIPT_NAME, PATH_TRANSLATED, GATEWAY_INTERFACE
ADDENV("REMOTE_ADDR=%s", Connection->RemoteIp().c_str());
ADDENV("SERVER_NAME=%s", Connection->LocalIp().c_str());
ADDENV("SERVER_PORT=%d", Connection->LocalPort());
ADDENV("SERVER_PROTOCOL=%s", Connection->Protocol());
ADDENV("SERVER_SOFTWARE=%s", VERSION);
for (tStrStrMap::const_iterator it = Connection->Headers().begin(); it != Connection->Headers().end(); ++it) {
if (i >= MAXENV) {
esyslog("streamdev-server: Too many headers for externremux.sh");
break;
}
ADDENV("%s=%s", it->first.c_str(), it->second.c_str());
}
// look for section parameters: /path;param1=value1;param2=value2/
std::string::size_type begin, end;
const static std::string PATH_INFO("PATH_INFO");
tStrStrMap::const_iterator it_pathinfo = Connection->Headers().find(PATH_INFO);
const std::string& path = it_pathinfo == Connection->Headers().end() ? "/" : it_pathinfo->second;
begin = path.find(';', 0);
begin = path.find_first_not_of(';', begin);
end = path.find_first_of(";/", begin);
while (begin != std::string::npos && path[begin] != '/') {
std::string param = path.substr(begin, end - begin);
std::string::size_type e = param.find('=');
if (i >= MAXENV) {
esyslog("streamdev-server: Too many parameters for externremux.sh");
break;
}
else if (e > 0 && e != std::string::npos) {
ADDENV("REMUX_PARAM_%s", param.c_str());
}
else
esyslog("streamdev-server: Invalid externremux.sh parameter %s", param.c_str());
begin = path.find_first_not_of(';', end);
end = path.find_first_of(";/", begin);
}
}
env[i] = NULL;
dup2(inpipe[0], STDIN_FILENO);
close(inpipe[1]);
dup2(outpipe[1], STDOUT_FILENO);
close(outpipe[0]);
int MaxPossibleFileDescriptors = getdtablesize();
for (int i = STDERR_FILENO + 1; i < MaxPossibleFileDescriptors; i++)
close(i); //close all dup'ed filedescriptors
if (setpgid(0, 0) == -1)
esyslog("streamdev-server: externremux setpgid failed: %m");
if (access(opt_remux, X_OK) == -1) {
esyslog("streamdev-server %s: %m", opt_remux);
_exit(-1);
}
if (execle("/bin/sh", "sh", "-c", opt_remux, NULL, env) == -1) {
esyslog("streamdev-server: externremux script '%s' execution failed: %m", opt_remux);
_exit(-1);
}
// should never be reached
_exit(0);
}
close(inpipe[0]);
close(outpipe[1]);
m_Inpipe = inpipe[1];
m_Outpipe = outpipe[0];
Start();
}
cTSExt::~cTSExt()
{
m_Active = false;
Cancel(3);
if (m_Process > 0) {
// close pipes
close(m_Outpipe);
close(m_Inpipe);
// signal and wait for termination
if (kill(m_Process, SIGINT) < 0) {
esyslog("streamdev-server: externremux SIGINT failed: %m");
}
else {
int i = 0;
int retval;
while ((retval = waitpid(m_Process, NULL, WNOHANG)) == 0) {
if ((++i % 20) == 0) {
esyslog("streamdev-server: externremux process won't stop - killing it");
kill(m_Process, SIGKILL);
}
cCondWait::SleepMs(100);
}
if (retval < 0)
esyslog("streamdev-server: externremux process waitpid failed: %m");
else
Dprintf("streamdev-server: externremux child (%d) exited as expected\n", m_Process);
}
m_Process = -1;
}
}
void cTSExt::Action(void)
{
m_Active = true;
while (m_Active) {
fd_set rfds;
struct timeval tv;
FD_ZERO(&rfds);
FD_SET(m_Outpipe, &rfds);
while (FD_ISSET(m_Outpipe, &rfds)) {
tv.tv_sec = 2;
tv.tv_usec = 0;
if (select(m_Outpipe + 1, &rfds, NULL, NULL, &tv) == -1) {
LOG_ERROR_STR("poll failed");
break;;
}
if (FD_ISSET(m_Outpipe, &rfds)) {
int result;
//Read returns 0 if buffer full or EOF
bool bufferFull = m_ResultBuffer->Free() <= 0; //Free may be < 0
while ((result = m_ResultBuffer->Read(m_Outpipe)) == 0 && bufferFull)
dsyslog("streamdev-server: buffer full while reading from externremux");
if (result == -1) {
if (errno != EINTR && errno != EAGAIN) {
LOG_ERROR_STR("read failed");
m_Active = false;
}
break;
}
else if (result == 0) {
esyslog("streamdev-server: EOF reading from externremux");
m_Active = false;
break;
}
}
}
}
m_Active = false;
}
void cTSExt::Put(const uchar *Data, int Count)
{
if (safe_write(m_Inpipe, Data, Count) == -1) {
LOG_ERROR_STR("write failed");
return;
}
}
cExternRemux::cExternRemux(const cServerConnection *Connection, const cChannel *Channel, const int *Apids, const int *Dpids):
m_ResultBuffer(new cRingBufferLinear(WRITERBUFSIZE)),
m_Remux(new cTSExt(m_ResultBuffer, Connection, Channel, NULL, Apids, Dpids))
{
m_ResultBuffer->SetTimeouts(500, 100);
}
cExternRemux::cExternRemux(const cServerConnection *Connection, const cPatPmtParser *PatPmt, const int *Apids, const int *Dpids):
m_ResultBuffer(new cRingBufferLinear(WRITERBUFSIZE)),
m_Remux(new cTSExt(m_ResultBuffer, Connection, NULL, PatPmt, Apids, Dpids))
{
m_ResultBuffer->SetTimeouts(500, 100);
}
cExternRemux::~cExternRemux()
{
delete m_Remux;
delete m_ResultBuffer;
}
int cExternRemux::Put(const uchar *Data, int Count)
{
m_Remux->Put(Data, Count);
return Count;
}
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