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mistserver/lib/config.cpp
Erik Zandvliet dda0ea669c Fully implemented DTSC pull support
2016-05-05 16:05:12 +02:00

636 lines
21 KiB
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/// \file config.cpp
/// Contains generic functions for managing configuration.
#include "config.h"
#include "defines.h"
#include "timing.h"
#include "tinythread.h"
#include "stream.h"
#include <string.h>
#include <signal.h>
#ifdef __CYGWIN__
#include <windows.h>
#endif
#if defined(__FreeBSD__) || defined(__APPLE__) || defined(__MACH__)
#include <sys/wait.h>
#else
#include <wait.h>
#endif
#if defined(__APPLE__)
#include <mach-o/dyld.h>
#endif
#include <errno.h>
#include <iostream>
#include <signal.h>
#include <sys/types.h>
#include <unistd.h>
#include <fcntl.h>
#include <pwd.h>
#include <getopt.h>
#include <stdlib.h>
#include <fstream>
#include <dirent.h> //for getMyExec
#include "procs.h"
bool Util::Config::is_active = false;
unsigned int Util::Config::printDebugLevel = DEBUG;//
Util::Config::Config() {
//global options here
vals["debug"]["long"] = "debug";
vals["debug"]["short"] = "g";
vals["debug"]["arg"] = "integer";
vals["debug"]["help"] = "The debug level at which messages need to be printed.";
vals["debug"]["value"].append((long long)DEBUG);
}
/// Creates a new configuration manager.
Util::Config::Config(std::string cmd) {
vals.null();
long_count = 2;
vals["cmd"]["value"].append(cmd);
vals["version"]["long"] = "version";
vals["version"]["short"] = "v";
vals["version"]["help"] = "Display library and application version, then exit.";
vals["help"]["long"] = "help";
vals["help"]["short"] = "h";
vals["help"]["help"] = "Display usage and version information, then exit.";
vals["debug"]["long"] = "debug";
vals["debug"]["short"] = "g";
vals["debug"]["arg"] = "integer";
vals["debug"]["help"] = "The debug level at which messages need to be printed.";
vals["debug"]["value"].append((long long)DEBUG);
}
/// Adds an option to the configuration parser.
/// The option needs an unique name (doubles will overwrite the previous) and can contain the following in the option itself:
///\code
/// {
/// "short":"o", //The short option letter
/// "long":"onName", //The long option
/// "arg":"integer", //The type of argument, if required.
/// "value":[], //The default value(s) for this option if it is not given on the commandline.
/// "arg_num":1, //The count this value has on the commandline, after all the options have been processed.
/// "help":"Blahblahblah" //The helptext for this option.
/// }
///\endcode
void Util::Config::addOption(std::string optname, JSON::Value option) {
vals[optname] = option;
if (!vals[optname].isMember("value") && vals[optname].isMember("default")) {
vals[optname]["value"].append(vals[optname]["default"]);
vals[optname].removeMember("default");
}
long_count = 0;
jsonForEach(vals, it) {
if (it->isMember("long")) {
long_count++;
}
}
}
/// Prints a usage message to the given output.
void Util::Config::printHelp(std::ostream & output) {
unsigned int longest = 0;
std::map<long long int, std::string> args;
jsonForEach(vals, it) {
unsigned int current = 0;
if (it->isMember("long")) {
current += (*it)["long"].asString().size() + 4;
}
if (it->isMember("short")) {
current += (*it)["short"].asString().size() + 3;
}
if (current > longest) {
longest = current;
}
current = 0;
if (current > longest) {
longest = current;
}
if (it->isMember("arg_num")) {
current = it.key().size() + 3;
if (current > longest) {
longest = current;
}
args[(*it)["arg_num"].asInt()] = it.key();
}
}
output << "Usage: " << getString("cmd") << " [options]";
for (std::map<long long int, std::string>::iterator i = args.begin(); i != args.end(); i++) {
if (vals[i->second].isMember("value") && vals[i->second]["value"].size()) {
output << " [" << i->second << "]";
} else {
output << " " << i->second;
}
}
output << std::endl << std::endl;
jsonForEach(vals, it) {
std::string f;
if (it->isMember("long") || it->isMember("short")) {
if (it->isMember("long") && it->isMember("short")) {
f = "--" + (*it)["long"].asString() + ", -" + (*it)["short"].asString();
} else {
if (it->isMember("long")) {
f = "--" + (*it)["long"].asString();
}
if (it->isMember("short")) {
f = "-" + (*it)["short"].asString();
}
}
while (f.size() < longest) {
f.append(" ");
}
if (it->isMember("arg")) {
output << f << "(" << (*it)["arg"].asString() << ") " << (*it)["help"].asString() << std::endl;
} else {
output << f << (*it)["help"].asString() << std::endl;
}
}
if (it->isMember("arg_num")) {
f = it.key();
while (f.size() < longest) {
f.append(" ");
}
output << f << "(" << (*it)["arg"].asString() << ") " << (*it)["help"].asString() << std::endl;
}
}
}
/// Parses commandline arguments.
/// Calls exit if an unknown option is encountered, printing a help message.
bool Util::Config::parseArgs(int & argc, char ** & argv) {
int opt = 0;
std::string shortopts;
struct option * longOpts = (struct option *)calloc(long_count + 1, sizeof(struct option));
int long_i = 0;
int arg_count = 0;
if (vals.size()) {
jsonForEach(vals, it) {
if (it->isMember("short")) {
shortopts += (*it)["short"].asString();
if (it->isMember("arg")) {
shortopts += ":";
}
}
if (it->isMember("long")) {
longOpts[long_i].name = (*it)["long"].asStringRef().c_str();
longOpts[long_i].val = (*it)["short"].asString()[0];
if (it->isMember("arg")) {
longOpts[long_i].has_arg = 1;
}
long_i++;
}
if (it->isMember("arg_num") && !(it->isMember("value") && (*it)["value"].size())) {
if ((*it)["arg_num"].asInt() > arg_count) {
arg_count = (*it)["arg_num"].asInt();
}
}
}
}
while ((opt = getopt_long(argc, argv, shortopts.c_str(), longOpts, 0)) != -1) {
switch (opt) {
case 'h':
case '?':
printHelp(std::cout);
case 'v':
std::cout << "Version: " PACKAGE_VERSION ", release " RELEASE << std::endl;
#ifdef NOCRASHCHECK
std::cout << "- Flag: No crash check. Will not attempt to detect and kill crashed processes." << std::endl;
#endif
#ifndef SHM_ENABLED
std::cout << "- Flag: Shared memory disabled. Will use shared files in stead of shared memory as IPC method." << std::endl;
#endif
#ifdef WITH_THREADNAMES
std::cout << "- Flag: With threadnames. Debuggers will show sensible human-readable thread names." << std::endl;
#endif
/*LTS-START*/
#ifdef BIGMETA
std::cout << "- Flag: Big metadata. Enabled longer live stream durations. Breaks compatibility with DTSH files generated by versions without this flag." << std::endl;
#endif
#ifndef UPDATER
std::cout << "- Flag: Updater disabled. Server will not call back home and attempt to search for updates at regular intervals." << std::endl;
#endif
#ifdef NOAUTH
std::cout << "- Flag: No authentication. API calls do not require logging in with a valid account first. Make sure access to API port isn't public!" << std::endl;
#endif
#ifdef KILLONEXIT
std::cout << "- Flag: Kill on exit. All binaries will forcibly shut down all their children on exit. This disabled rolling restart support." << std::endl;
#endif
#ifdef STATS_DELAY
std::cout << "- Setting: Stats delay " << STATS_DELAY << ". Statistics of viewer counts are delayed by " << STATS_DELAY << " seconds as opposed to the default of 15 seconds. ";
if (STATS_DELAY > 15){
std::cout << "This makes them more accurate." << std::endl;
}else{
std::cout << "This makes them less accurate." << std::endl;
}
#endif
/*LTS-END*/
std::cout << "Built on " __DATE__ ", " __TIME__ << std::endl;
exit(1);
break;
default:
jsonForEach(vals, it) {
if (it->isMember("short") && (*it)["short"].asString()[0] == opt) {
if (it->isMember("arg")) {
(*it)["value"].append((std::string)optarg);
} else {
(*it)["value"].append((long long int)1);
}
break;
}
}
break;
}
} //commandline options parser
free(longOpts); //free the long options array
long_i = 1; //re-use long_i as an argument counter
while (optind < argc) { //parse all remaining options, ignoring anything unexpected.
jsonForEach(vals, it) {
if (it->isMember("arg_num") && (*it)["arg_num"].asInt() == long_i) {
(*it)["value"].append((std::string)argv[optind]);
break;
}
}
optind++;
long_i++;
}
if (long_i <= arg_count) {
return false;
}
printDebugLevel = getInteger("debug");
return true;
}
bool Util::Config::hasOption(const std::string & optname) {
return vals.isMember(optname);
}
/// Returns a reference to the current value of an option or default if none was set.
/// If the option does not exist, this exits the application with a return code of 37.
JSON::Value & Util::Config::getOption(std::string optname, bool asArray) {
if (!vals.isMember(optname)) {
std::cout << "Fatal error: a non-existent option '" << optname << "' was accessed." << std::endl;
exit(37);
}
if (!vals[optname].isMember("value") || !vals[optname]["value"].isArray()) {
vals[optname]["value"].append(JSON::Value());
vals[optname]["value"].shrink(0);
}
if (asArray) {
return vals[optname]["value"];
} else {
int n = vals[optname]["value"].size();
if (!n){
static JSON::Value empty = "";
return empty;
}else{
return vals[optname]["value"][n - 1];
}
}
}
/// Returns the current value of an option or default if none was set as a string.
/// Calls getOption internally.
std::string Util::Config::getString(std::string optname) {
return getOption(optname).asString();
}
/// Returns the current value of an option or default if none was set as a long long int.
/// Calls getOption internally.
long long int Util::Config::getInteger(std::string optname) {
return getOption(optname).asInt();
}
/// Returns the current value of an option or default if none was set as a bool.
/// Calls getOption internally.
bool Util::Config::getBool(std::string optname) {
return getOption(optname).asBool();
}
struct callbackData {
Socket::Connection * sock;
int (*cb)(Socket::Connection &);
};
static void callThreadCallback(void * cDataArg) {
DEBUG_MSG(DLVL_INSANE, "Thread for %p started", cDataArg);
callbackData * cData = (callbackData *)cDataArg;
cData->cb(*(cData->sock));
cData->sock->close();
delete cData->sock;
delete cData;
DEBUG_MSG(DLVL_INSANE, "Thread for %p ended", cDataArg);
}
int Util::Config::threadServer(Socket::Server & server_socket, int (*callback)(Socket::Connection &)) {
Util::Procs::socketList.insert(server_socket.getSocket());
while (is_active && server_socket.connected()) {
Socket::Connection S = server_socket.accept();
if (S.connected()) { //check if the new connection is valid
callbackData * cData = new callbackData;
cData->sock = new Socket::Connection(S);
cData->cb = callback;
//spawn a new thread for this connection
tthread::thread T(callThreadCallback, (void *)cData);
//detach it, no need to keep track of it anymore
T.detach();
DEBUG_MSG(DLVL_HIGH, "Spawned new thread for socket %i", S.getSocket());
} else {
Util::sleep(10); //sleep 10ms
}
}
Util::Procs::socketList.erase(server_socket.getSocket());
server_socket.close();
return 0;
}
int Util::Config::forkServer(Socket::Server & server_socket, int (*callback)(Socket::Connection &)) {
Util::Procs::socketList.insert(server_socket.getSocket());
while (is_active && server_socket.connected()) {
Socket::Connection S = server_socket.accept();
if (S.connected()) { //check if the new connection is valid
pid_t myid = fork();
if (myid == 0) { //if new child, start MAINHANDLER
server_socket.drop();
return callback(S);
} else { //otherwise, do nothing or output debugging text
DEBUG_MSG(DLVL_HIGH, "Forked new process %i for socket %i", (int)myid, S.getSocket());
S.drop();
}
} else {
Util::sleep(10); //sleep 10ms
}
}
Util::Procs::socketList.erase(server_socket.getSocket());
server_socket.close();
return 0;
}
int Util::Config::serveThreadedSocket(int (*callback)(Socket::Connection &)) {
Socket::Server server_socket;
if (vals.isMember("socket")) {
server_socket = Socket::Server(Util::getTmpFolder() + getString("socket"));
}
if (vals.isMember("port") && vals.isMember("interface")) {
server_socket = Socket::Server(getInteger("port"), getString("interface"), false);
}
if (!server_socket.connected()) {
DEBUG_MSG(DLVL_DEVEL, "Failure to open socket");
return 1;
}
DEBUG_MSG(DLVL_DEVEL, "Activating threaded server: %s", getString("cmd").c_str());
activate();
return threadServer(server_socket, callback);
}
int Util::Config::serveForkedSocket(int (*callback)(Socket::Connection & S)) {
Socket::Server server_socket;
if (vals.isMember("socket")) {
server_socket = Socket::Server(Util::getTmpFolder() + getString("socket"));
}
if (vals.isMember("port") && vals.isMember("interface")) {
server_socket = Socket::Server(getInteger("port"), getString("interface"), false);
}
if (!server_socket.connected()) {
DEBUG_MSG(DLVL_DEVEL, "Failure to open socket");
return 1;
}
DEBUG_MSG(DLVL_DEVEL, "Activating forked server: %s", getString("cmd").c_str());
activate();
return forkServer(server_socket, callback);
}
/// Activated the stored config. This will:
/// - Drop permissions to the stored "username", if any.
/// - Set is_active to true.
/// - Set up a signal handler to set is_active to false for the SIGINT, SIGHUP and SIGTERM signals.
void Util::Config::activate() {
if (vals.isMember("username")) {
setUser(getString("username"));
vals.removeMember("username");
}
struct sigaction new_action;
struct sigaction cur_action;
new_action.sa_sigaction = signal_handler;
sigemptyset(&new_action.sa_mask);
new_action.sa_flags = 0;
sigaction(SIGINT, &new_action, NULL);
sigaction(SIGHUP, &new_action, NULL);
sigaction(SIGTERM, &new_action, NULL);
sigaction(SIGPIPE, &new_action, NULL);
//check if a child signal handler isn't set already, if so, set it.
sigaction(SIGCHLD, 0, &cur_action);
if (cur_action.sa_handler == SIG_DFL || cur_action.sa_handler == SIG_IGN) {
sigaction(SIGCHLD, &new_action, NULL);
}
is_active = true;
}
/// Basic signal handler. Sets is_active to false if it receives
/// a SIGINT, SIGHUP or SIGTERM signal, reaps children for the SIGCHLD
/// signal, and ignores all other signals.
void Util::Config::signal_handler(int signum, siginfo_t * sigInfo, void * ignore) {
HIGH_MSG("Received signal %s (%d) from process %d", strsignal(signum), signum, sigInfo->si_pid);
switch (signum) {
case SIGINT: //these three signals will set is_active to false.
case SIGHUP:
case SIGTERM:
is_active = false;
break;
case SIGCHLD: { //when a child dies, reap it.
int status;
pid_t ret = -1;
while (ret != 0) {
ret = waitpid(-1, &status, WNOHANG);
if (ret < 0 && errno != EINTR) {
break;
}
}
break;
}
default: //other signals are ignored
break;
}
} //signal_handler
/// Adds the options from the given JSON capabilities structure.
/// Recurses into optional and required, added options as needed.
void Util::Config::addOptionsFromCapabilities(const JSON::Value & capa){
//First add the required options.
if (capa.isMember("required") && capa["required"].size()){
jsonForEachConst(capa["required"], it){
if (!it->isMember("short") || !it->isMember("option") || !it->isMember("type")){
FAIL_MSG("Incomplete required option: %s", it.key().c_str());
continue;
}
JSON::Value opt;
opt["short"] = (*it)["short"];
opt["long"] = (*it)["option"].asStringRef().substr(2);
if (it->isMember("type")){
//int, uint, debug, select, str
if ((*it)["type"].asStringRef() == "int" || (*it)["type"].asStringRef() == "uint"){
opt["arg"] = "integer";
}else{
opt["arg"] = "string";
}
}
if (it->isMember("default")){
opt["value"].append((*it)["default"]);
}
opt["help"] = (*it)["help"];
addOption(it.key(), opt);
}
}
//Then, the optionals.
if (capa.isMember("optional") && capa["optional"].size()){
jsonForEachConst(capa["optional"], it){
if (it.key() == "debug"){continue;}
if (!it->isMember("short") || !it->isMember("option") || !it->isMember("default")){
FAIL_MSG("Incomplete optional option: %s", it.key().c_str());
continue;
}
JSON::Value opt;
opt["short"] = (*it)["short"];
opt["long"] = (*it)["option"].asStringRef().substr(2);
if (it->isMember("type")){
//int, uint, debug, select, str
if ((*it)["type"].asStringRef() == "int" || (*it)["type"].asStringRef() == "uint"){
opt["arg"] = "integer";
}else{
opt["arg"] = "string";
}
}
if (it->isMember("default")){
opt["value"].append((*it)["default"]);
}
opt["help"] = (*it)["help"];
addOption(it.key(), opt);
}
}
}
/// Adds the default connector options. Also updates the capabilities structure with the default options.
/// Besides the options addBasicConnectorOptions adds, this function also adds port and interface options.
void Util::Config::addConnectorOptions(int port, JSON::Value & capabilities) {
capabilities["optional"]["port"]["name"] = "TCP port";
capabilities["optional"]["port"]["help"] = "TCP port to listen on";
capabilities["optional"]["port"]["type"] = "uint";
capabilities["optional"]["port"]["short"] = "p";
capabilities["optional"]["port"]["option"] = "--port";
capabilities["optional"]["port"]["default"] = (long long)port;
capabilities["optional"]["interface"]["name"] = "Interface";
capabilities["optional"]["interface"]["help"] = "Address of the interface to listen on";
capabilities["optional"]["interface"]["default"] = "0.0.0.0";
capabilities["optional"]["interface"]["option"] = "--interface";
capabilities["optional"]["interface"]["short"] = "i";
capabilities["optional"]["interface"]["type"] = "str";
addBasicConnectorOptions(capabilities);
} //addConnectorOptions
/// Adds the default connector options. Also updates the capabilities structure with the default options.
void Util::Config::addBasicConnectorOptions(JSON::Value & capabilities) {
capabilities["optional"]["username"]["name"] = "Username";
capabilities["optional"]["username"]["help"] = "Username to drop privileges to - default if unprovided means do not drop privileges";
capabilities["optional"]["username"]["option"] = "--username";
capabilities["optional"]["username"]["short"] = "u";
capabilities["optional"]["username"]["default"] = "root";
capabilities["optional"]["username"]["type"] = "str";
addOptionsFromCapabilities(capabilities);
JSON::Value option;
option["long"] = "json";
option["short"] = "j";
option["help"] = "Output connector info in JSON format, then exit.";
option["value"].append(0ll);
addOption("json", option);
}
/// Gets directory the current executable is stored in.
std::string Util::getMyPath() {
char mypath[500];
#ifdef __CYGWIN__
GetModuleFileName(0, mypath, 500);
#else
#ifdef __APPLE__
memset(mypath, 0, 500);
unsigned int refSize = 500;
int ret = _NSGetExecutablePath(mypath, &refSize);
#else
int ret = readlink("/proc/self/exe", mypath, 500);
if (ret != -1) {
mypath[ret] = 0;
} else {
mypath[0] = 0;
}
#endif
#endif
std::string tPath = mypath;
size_t slash = tPath.rfind('/');
if (slash == std::string::npos) {
slash = tPath.rfind('\\');
if (slash == std::string::npos) {
return "";
}
}
tPath.resize(slash + 1);
return tPath;
}
/// Gets all executables in getMyPath that start with "Mist".
void Util::getMyExec(std::deque<std::string> & execs) {
std::string path = Util::getMyPath();
#ifdef __CYGWIN__
path += "\\Mist*";
WIN32_FIND_DATA FindFileData;
HANDLE hdl = FindFirstFile(path.c_str(), &FindFileData);
while (hdl != INVALID_HANDLE_VALUE) {
execs.push_back(FindFileData.cFileName);
if (!FindNextFile(hdl, &FindFileData)) {
FindClose(hdl);
hdl = INVALID_HANDLE_VALUE;
}
}
#else
DIR * d = opendir(path.c_str());
if (!d) {
return;
}
struct dirent * dp;
do {
errno = 0;
if ((dp = readdir(d))) {
if (strncmp(dp->d_name, "Mist", 4) == 0) {
execs.push_back(dp->d_name);
}
}
} while (dp != NULL);
closedir(d);
#endif
}
/// Sets the current process' running user
void Util::setUser(std::string username) {
if (username != "root") {
struct passwd * user_info = getpwnam(username.c_str());
if (!user_info) {
DEBUG_MSG(DLVL_ERROR, "Error: could not setuid %s: could not get PID", username.c_str());
return;
} else {
if (setuid(user_info->pw_uid) != 0) {
DEBUG_MSG(DLVL_ERROR, "Error: could not setuid %s: not allowed", username.c_str());
} else {
DEBUG_MSG(DLVL_DEVEL, "Change user to %s", username.c_str());
}
}
}
}
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