icinga2/lib/cli/daemoncommand.cpp

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/******************************************************************************
* Icinga 2 *
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* Copyright (C) 2012-2015 Icinga Development Team (http://www.icinga.org) *
* *
* This program is free software; you can redistribute it and/or *
* modify it under the terms of the GNU General Public License *
* as published by the Free Software Foundation; either version 2 *
* of the License, or (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the Free Software Foundation *
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. *
******************************************************************************/
#include "cli/daemoncommand.hpp"
#include "cli/daemonutility.hpp"
#include "config/configcompiler.hpp"
#include "config/configcompilercontext.hpp"
#include "config/configitembuilder.hpp"
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#include "base/logger.hpp"
#include "base/application.hpp"
#include "base/timer.hpp"
#include "base/utility.hpp"
#include "base/exception.hpp"
#include "base/convert.hpp"
#include "base/scriptglobal.hpp"
#include "base/context.hpp"
#include "config.h"
#include <boost/program_options.hpp>
#include <boost/tuple/tuple.hpp>
#include <boost/foreach.hpp>
#include <iostream>
using namespace icinga;
namespace po = boost::program_options;
static po::variables_map g_AppParams;
REGISTER_CLICOMMAND("daemon", DaemonCommand);
#ifndef _WIN32
static void SigHupHandler(int)
{
Application::RequestRestart();
}
#endif /* _WIN32 */
static bool Daemonize(void)
{
#ifndef _WIN32
Application::GetTP().Stop();
pid_t pid = fork();
if (pid == -1) {
return false;
}
if (pid) {
// systemd requires that the pidfile of the daemon is written before the forking
// process terminates. So wait till either the forked daemon has written a pidfile or died.
int status;
int ret;
pid_t readpid;
do {
Utility::Sleep(0.1);
readpid = Application::ReadPidFile(Application::GetPidPath());
ret = waitpid(pid, &status, WNOHANG);
} while (readpid != pid && ret == 0);
if (ret == pid) {
Log(LogCritical, "cli", "The daemon could not be started. See log output for details.");
_exit(EXIT_FAILURE);
} else if (ret == -1) {
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Log(LogCritical, "cli")
<< "waitpid() failed with error code " << errno << ", \"" << Utility::FormatErrorNumber(errno) << "\"";
_exit(EXIT_FAILURE);
}
_exit(EXIT_SUCCESS);
}
Application::GetTP().Start();
#endif /* _WIN32 */
return true;
}
static bool SetDaemonIO(const String& stderrFile)
{
#ifndef _WIN32
int fdnull = open("/dev/null", O_RDWR);
if (fdnull >= 0) {
if (fdnull != 0)
dup2(fdnull, 0);
if (fdnull != 1)
dup2(fdnull, 1);
if (fdnull > 1)
close(fdnull);
}
const char *errPath = "/dev/null";
if (!stderrFile.IsEmpty())
errPath = stderrFile.CStr();
int fderr = open(errPath, O_WRONLY | O_APPEND);
if (fderr < 0 && errno == ENOENT)
fderr = open(errPath, O_CREAT | O_WRONLY | O_APPEND, 0600);
if (fderr >= 0) {
if (fderr != 2)
dup2(fderr, 2);
if (fderr > 2)
close(fderr);
}
pid_t sid = setsid();
if (sid == -1) {
return false;
}
#endif
return true;
}
/**
* Terminate another process and wait till it has ended
*
* @params target PID of the process to end
*/
static void TerminateAndWaitForEnd(pid_t target)
{
#ifndef _WIN32
// allow 30 seconds timeout
double timeout = Utility::GetTime() + 30;
int ret = kill(target, SIGTERM);
while (Utility::GetTime() < timeout && (ret == 0 || errno != ESRCH)) {
Utility::Sleep(0.1);
ret = kill(target, 0);
}
// timeout and the process still seems to live: kill it
if (ret == 0 || errno != ESRCH)
kill(target, SIGKILL);
#else
// TODO: implement this for Win32
#endif /* _WIN32 */
}
String DaemonCommand::GetDescription(void) const
{
return "Starts Icinga 2.";
}
String DaemonCommand::GetShortDescription(void) const
{
return "starts Icinga 2";
}
void DaemonCommand::InitParameters(boost::program_options::options_description& visibleDesc,
boost::program_options::options_description& hiddenDesc) const
{
visibleDesc.add_options()
("config,c", po::value<std::vector<std::string> >(), "parse a configuration file")
("no-config,z", "start without a configuration file")
("validate,C", "exit after validating the configuration")
("errorlog,e", po::value<std::string>(), "log fatal errors to the specified log file (only works in combination with --daemonize)")
#ifndef _WIN32
("daemonize,d", "detach from the controlling terminal")
#endif /* _WIN32 */
;
#ifndef _WIN32
hiddenDesc.add_options()
("reload-internal", po::value<int>(), "used internally to implement config reload: do not call manually, send SIGHUP instead");
#endif /* _WIN32 */
}
std::vector<String> DaemonCommand::GetArgumentSuggestions(const String& argument, const String& word) const
{
if (argument == "config" || argument == "errorlog")
return GetBashCompletionSuggestions("file", word);
else
return CLICommand::GetArgumentSuggestions(argument, word);
}
/**
* The entry point for the "daemon" CLI command.
*
* @returns An exit status.
*/
int DaemonCommand::Run(const po::variables_map& vm, const std::vector<std::string>& ap) const
{
if (!vm.count("validate"))
Logger::DisableTimestamp(false);
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Log(LogInformation, "cli")
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<< "Icinga application loader (version: " << Application::GetVersion()
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#ifdef I2_DEBUG
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<< "; debug"
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#endif /* I2_DEBUG */
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<< ")";
if (!vm.count("validate") && !vm.count("reload-internal")) {
pid_t runningpid = Application::ReadPidFile(Application::GetPidPath());
if (runningpid > 0) {
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Log(LogCritical, "cli")
<< "Another instance of Icinga already running with PID " << runningpid;
return EXIT_FAILURE;
}
}
std::vector<std::string> configs;
if (vm.count("config") > 0)
configs = vm["config"].as < std::vector<std::string> >() ;
else if (!vm.count("no-config"))
configs.push_back(Application::GetSysconfDir() + "/icinga2/icinga2.conf");
if (!DaemonUtility::LoadConfigFiles(configs, Application::GetObjectsPath(), Application::GetVarsPath()))
return EXIT_FAILURE;
if (vm.count("validate")) {
Log(LogInformation, "cli", "Finished validating the configuration file(s).");
return EXIT_SUCCESS;
}
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if (vm.count("reload-internal")) {
int parentpid = vm["reload-internal"].as<int>();
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Log(LogInformation, "cli")
<< "Terminating previous instance of Icinga (PID " << parentpid << ")";
TerminateAndWaitForEnd(parentpid);
Log(LogInformation, "cli", "Previous instance has ended, taking over now.");
}
if (vm.count("daemonize")) {
if (!vm.count("reload-internal")) {
// no additional fork neccessary on reload
try {
Daemonize();
} catch (std::exception&) {
Log(LogCritical, "cli", "Daemonize failed. Exiting.");
return EXIT_FAILURE;
}
}
}
// activate config only after daemonization: it starts threads and that is not compatible with fork()
if (!ConfigItem::ActivateItems()) {
Log(LogCritical, "cli", "Error activating configuration.");
return EXIT_FAILURE;
}
if (vm.count("daemonize")) {
String errorLog;
if (vm.count("errorlog"))
errorLog = vm["errorlog"].as<std::string>();
SetDaemonIO(errorLog);
Logger::DisableConsoleLog();
}
#ifndef _WIN32
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
sa.sa_handler = &SigHupHandler;
sigaction(SIGHUP, &sa, NULL);
#endif /* _WIN32 */
return Application::GetInstance()->Run();
}