234 lines
8.7 KiB
C++
234 lines
8.7 KiB
C++
/// \file stream.cpp
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/// Utilities for handling streams.
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <semaphore.h>
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#include "json.h"
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#include "stream.h"
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#include "procs.h"
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#include "config.h"
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#include "socket.h"
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#include "defines.h"
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#include "shared_memory.h"
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#include "dtsc.h"
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std::string Util::getTmpFolder() {
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std::string dir;
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char * tmp_char = 0;
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if (!tmp_char) {
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tmp_char = getenv("TMP");
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}
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if (!tmp_char) {
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tmp_char = getenv("TEMP");
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}
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if (!tmp_char) {
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tmp_char = getenv("TMPDIR");
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}
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if (tmp_char) {
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dir = tmp_char;
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dir += "/mist";
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} else {
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#if defined(_WIN32) || defined(_CYGWIN_)
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dir = "C:/tmp/mist";
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#else
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dir = "/tmp/mist";
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#endif
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}
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if (access(dir.c_str(), 0) != 0) {
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mkdir(dir.c_str(), S_IRWXU | S_IRWXG | S_IRWXO); //attempt to create mist folder - ignore failures
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}
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return dir + "/";
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}
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/// Filters the streamname, removing invalid characters and converting all
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/// letters to lowercase. If a '?' character is found, everything following
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/// that character is deleted. The original string is modified. If a '+' or space
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/// exists, then only the part before that is sanitized.
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void Util::sanitizeName(std::string & streamname) {
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//strip anything that isn't numbers, digits or underscores
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size_t index = streamname.find_first_of("+ ");
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if(index != std::string::npos){
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std::string preplus = streamname.substr(0,index);
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sanitizeName(preplus);
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std::string postplus = streamname.substr(index+1);
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if (postplus.find('?') != std::string::npos){
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postplus = postplus.substr(0, (postplus.find('?')));
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}
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streamname = preplus+"+"+postplus;
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return;
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}
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for (std::string::iterator i = streamname.end() - 1; i >= streamname.begin(); --i) {
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if (*i == '?') {
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streamname.erase(i, streamname.end());
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break;
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}
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if ( !isalpha( *i) && !isdigit( *i) && *i != '_' && *i != '.'){
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streamname.erase(i);
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} else {
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*i = tolower(*i);
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}
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}
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}
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/// Checks if the given streamname has an active input serving it. Returns true if this is the case.
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/// Assumes the streamname has already been through sanitizeName()!
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bool Util::streamAlive(std::string & streamname){
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IPC::semaphore playerLock(std::string("/lock_" + streamname).c_str(), O_CREAT | O_RDWR, ACCESSPERMS, 1);
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if (!playerLock.tryWait()) {
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playerLock.close();
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return true;
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}else{
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playerLock.post();
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playerLock.close();
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return false;
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}
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}
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/// Assures the input for the given stream name is active.
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/// Does stream name sanitizion first, followed by a stream name length check (<= 100 chars).
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/// Then, checks if an input is already active by running streamAlive(). If yes, aborts.
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/// If no, loads up the server configuration and attempts to start the given stream according to current config.
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/// At this point, fails and aborts if MistController isn't running.
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bool Util::startInput(std::string streamname, std::string filename, bool forkFirst) {
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sanitizeName(streamname);
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if (streamname.size() > 100){
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FAIL_MSG("Stream opening denied: %s is longer than 100 characters (%lu).", streamname.c_str(), streamname.size());
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return false;
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}
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//Check if the stream is already active.
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//If yes, don't activate again to prevent duplicate inputs.
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//It's still possible a duplicate starts anyway, this is caught in the inputs initializer.
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//Note: this uses the _whole_ stream name, including + (if any).
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//This means "test+a" and "test+b" have separate locks and do not interact with each other.
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if (streamAlive(streamname)){
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DEBUG_MSG(DLVL_MEDIUM, "Stream %s already active; continuing", streamname.c_str());
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return true;
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}
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//Attempt to load up configuration and find this stream
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IPC::sharedPage mistConfOut("!mistConfig", DEFAULT_CONF_PAGE_SIZE);
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IPC::semaphore configLock("!mistConfLock", O_CREAT | O_RDWR, ACCESSPERMS, 1);
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//Lock the config to prevent race conditions and corruption issues while reading
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configLock.wait();
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DTSC::Scan config = DTSC::Scan(mistConfOut.mapped, mistConfOut.len);
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//Abort if no config available
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if (!config){
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FAIL_MSG("Configuration not available, aborting! Is MistController running?");
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configLock.post();//unlock the config semaphore
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return false;
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}
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//Find stream base name
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std::string smp = streamname.substr(0, streamname.find_first_of("+ "));
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//check if base name (everything before + or space) exists
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DTSC::Scan stream_cfg = config.getMember("streams").getMember(smp);
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if (!stream_cfg){
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DEBUG_MSG(DLVL_HIGH, "Stream %s not configured - attempting to ignore", streamname.c_str());
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}
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//Only use configured source if not manually overridden. Abort if no config is available.
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if (!filename.size()){
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if (!stream_cfg){
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DEBUG_MSG(DLVL_MEDIUM, "Stream %s not configured, no source manually given, cannot start", streamname.c_str());
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configLock.post();//unlock the config semaphore
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return false;
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}
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filename = stream_cfg.getMember("source").asString();
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}
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//check in curConf for capabilities-inputs-<naam>-priority/source_match
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std::string player_bin;
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bool selected = false;
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long long int curPrio = -1;
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DTSC::Scan inputs = config.getMember("capabilities").getMember("inputs");
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DTSC::Scan input;
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unsigned int input_size = inputs.getSize();
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for (unsigned int i = 0; i < input_size; ++i){
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input = inputs.getIndice(i);
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//if match voor current stream && priority is hoger dan wat we al hebben
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if (curPrio < input.getMember("priority").asInt()){
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std::string source = input.getMember("source_match").asString();
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std::string front = source.substr(0,source.find('*'));
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std::string back = source.substr(source.find('*')+1);
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DEBUG_MSG(DLVL_MEDIUM, "Checking input %s: %s (%s)", inputs.getIndiceName(i).c_str(), input.getMember("name").asString().c_str(), source.c_str());
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if (filename.substr(0,front.size()) == front && filename.substr(filename.size()-back.size()) == back){
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player_bin = Util::getMyPath() + "MistIn" + input.getMember("name").asString();
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curPrio = input.getMember("priority").asInt();
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selected = true;
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}
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}
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}
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if (!selected){
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configLock.post();//unlock the config semaphore
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FAIL_MSG("No compatible input found for stream %s: %s", streamname.c_str(), filename.c_str());
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return false;
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}
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//copy the neccessary arguments to separate storage so we can unlock the config semaphore safely
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std::map<std::string, std::string> str_args;
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//check required parameters
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DTSC::Scan required = input.getMember("required");
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unsigned int req_size = required.getSize();
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for (unsigned int i = 0; i < req_size; ++i){
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std::string opt = required.getIndiceName(i);
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if (!stream_cfg.getMember(opt)){
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configLock.post();//unlock the config semaphore
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FAIL_MSG("Required parameter %s for stream %s missing", opt.c_str(), streamname.c_str());
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return false;
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}
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str_args[required.getIndice(i).getMember("option").asString()] = stream_cfg.getMember(opt).asString();
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}
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//check optional parameters
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DTSC::Scan optional = input.getMember("optional");
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unsigned int opt_size = optional.getSize();
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for (unsigned int i = 0; i < opt_size; ++i){
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std::string opt = optional.getIndiceName(i);
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DEBUG_MSG(DLVL_VERYHIGH, "Checking optional %u: %s", i, opt.c_str());
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if (stream_cfg.getMember(opt)){
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str_args[optional.getIndice(i).getMember("option").asString()] = stream_cfg.getMember(opt).asString();
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}
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}
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//finally, unlock the config semaphore
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configLock.post();
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DEBUG_MSG(DLVL_MEDIUM, "Starting %s -s %s %s", player_bin.c_str(), streamname.c_str(), filename.c_str());
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char * argv[30] = {(char *)player_bin.c_str(), (char *)"-s", (char *)streamname.c_str(), (char *)filename.c_str()};
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int argNum = 3;
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std::string debugLvl;
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if (Util::Config::printDebugLevel != DEBUG && !str_args.count("--debug")){
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debugLvl = JSON::Value((long long)Util::Config::printDebugLevel).asString();
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argv[++argNum] = (char *)"--debug";
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argv[++argNum] = (char *)debugLvl.c_str();
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}
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for (std::map<std::string, std::string>::iterator it = str_args.begin(); it != str_args.end(); ++it){
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argv[++argNum] = (char *)it->first.c_str();
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argv[++argNum] = (char *)it->second.c_str();
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}
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argv[++argNum] = (char *)0;
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int pid = 0;
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if (forkFirst){
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DEBUG_MSG(DLVL_DONTEVEN, "Forking");
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pid = fork();
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if (pid == -1) {
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FAIL_MSG("Forking process for stream %s failed: %s", streamname.c_str(), strerror(errno));
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return false;
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}
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}else{
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DEBUG_MSG(DLVL_DONTEVEN, "Not forking");
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}
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if (pid == 0){
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DEBUG_MSG(DLVL_DONTEVEN, "execvp");
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execvp(argv[0], argv);
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FAIL_MSG("Starting process %s for stream %s failed: %s", argv[0], streamname.c_str(), strerror(errno));
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_exit(42);
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}
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return true;
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}
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