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icinga2/icinga-app/icinga.cpp

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/******************************************************************************
* Icinga 2 *
* Copyright (C) 2012-2013 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 "config/configcompilercontext.h"
#include "config/configcompiler.h"
#include "config/configitembuilder.h"
#include "base/application.h"
#include "base/logger_fwd.h"
#include "base/timer.h"
#include "base/utility.h"
#include "base/exception.h"
#include "base/convert.h"
#include <boost/program_options.hpp>
#include <boost/tuple/tuple.hpp>
#include <boost/smart_ptr/make_shared.hpp>
#include <boost/foreach.hpp>
#ifndef _WIN32
# include "icinga-version.h"
# define ICINGA_VERSION VERSION ", " GIT_MESSAGE
# include <ltdl.h>
# include <sys/types.h>
# include <pwd.h>
# include <grp.h>
#endif /* _WIN32 */
using namespace icinga;
namespace po = boost::program_options;
static po::variables_map g_AppParams;
static bool LoadConfigFiles(bool validateOnly)
{
ConfigCompilerContext::GetInstance()->Reset();
BOOST_FOREACH(const String& configPath, g_AppParams["config"].as<std::vector<String> >()) {
ConfigCompiler::CompileFile(configPath);
}
String name, fragment;
BOOST_FOREACH(boost::tie(name, fragment), ConfigFragmentRegistry::GetInstance()->GetItems()) {
ConfigCompiler::CompileText(name, fragment);
}
ConfigItemBuilder::Ptr builder = boost::make_shared<ConfigItemBuilder>();
builder->SetType(Application::GetApplicationType());
builder->SetName("application");
ConfigItem::Ptr item = builder->Compile();
item->Register();
bool result = ConfigItem::ActivateItems(validateOnly);
int warnings = 0, errors = 0;
BOOST_FOREACH(const ConfigCompilerMessage& message, ConfigCompilerContext::GetInstance()->GetMessages()) {
if (message.Error) {
Log(LogCritical, "config", "Config error: " + message.Text);
errors++;
} else {
Log(LogWarning, "config", "Config warning: " + message.Text);
warnings++;
}
}
if (warnings > 0 || errors > 0) {
LogSeverity severity;
if (errors == 0)
severity = LogWarning;
else
severity = LogCritical;
Log(severity, "config", Convert::ToString(errors) + " errors, " + Convert::ToString(warnings) + " warnings.");
}
if (!result)
return false;
ConfigItem::DiscardItems();
ConfigType::DiscardTypes();
return true;
}
static void SigHupHandler(int)
{
Application::RequestRestart();
}
static bool Daemonize(const String& stderrFile)
{
#ifndef _WIN32
pid_t pid = fork();
if (pid == -1) {
return false;
}
if (pid)
exit(0);
int fdnull = open("/dev/null", O_RDWR);
if (fdnull > 0) {
if (fdnull != 0)
dup2(fdnull, 0);
if (fdnull != 1)
dup2(fdnull, 1);
if (fdnull > 2)
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;
}
/**
* Entry point for the Icinga application.
*
* @params argc Number of command line arguments.
* @params argv Command line arguments.
* @returns The application's exit status.
*/
int main(int argc, char **argv)
{
#ifndef _WIN32
LTDL_SET_PRELOADED_SYMBOLS();
#endif /* _WIN32 */
#ifndef _WIN32
lt_dlinit();
#endif /* _WIN32 */
/* Set thread title. */
Utility::SetThreadName("Main Thread", false);
/* Set command-line arguments. */
Application::SetArgC(argc);
Application::SetArgV(argv);
/* Install exception handlers to make debugging easier. */
Application::InstallExceptionHandlers();
#ifdef ICINGA_PREFIX
Application::SetPrefixDir(ICINGA_PREFIX);
#else /* ICINGA_PREFIX */
Application::SetPrefixDir(".");
#endif /* ICINGA_PREFIX */
#ifdef ICINGA_LOCALSTATEDIR
Application::SetLocalStateDir(ICINGA_LOCALSTATEDIR);
#else /* ICINGA_LOCALSTATEDIR */
Application::SetLocalStateDir("./var");
#endif /* ICINGA_LOCALSTATEDIR */
#ifdef ICINGA_PKGLIBDIR
Application::SetPkgLibDir(ICINGA_PKGLIBDIR);
#else /* ICINGA_PKGLIBDIR */
Application::SetPkgLibDir(".");
#endif /* ICINGA_PKGLIBDIR */
#ifdef ICINGA_PKGDATADIR
Application::SetPkgDataDir(ICINGA_PKGDATADIR);
#else /* ICINGA_PKGDATADIR */
Application::SetPkgDataDir(".");
#endif /* ICINGA_PKGDATADIR */
Application::SetStatePath(Application::GetLocalStateDir() + "/lib/icinga2/icinga2.state");
Application::SetPidPath(Application::GetLocalStateDir() + "/run/icinga2/icinga2.pid");
Application::SetApplicationType("IcingaApplication");
po::options_description desc("Supported options");
desc.add_options()
("help", "show this help message")
("version,V", "show version information")
("library,l", po::value<std::vector<String> >(), "load a library")
("include,I", po::value<std::vector<String> >(), "add include search directory")
("config,c", po::value<std::vector<String> >(), "parse a configuration file")
("validate,C", "exit after validating the configuration")
("debug,x", "enable debugging")
("daemonize,d", "detach from the controlling terminal")
("errorlog,e", po::value<String>(), "log fatal errors to the specified log file (only works in combination with --daemonize)")
#ifndef _WIN32
("user,u", po::value<String>(), "user to run Icinga as")
("group,g", po::value<String>(), "group to run Icinga as")
#endif
;
try {
po::store(po::parse_command_line(argc, argv, desc), g_AppParams);
} catch (const std::exception& ex) {
std::ostringstream msgbuf;
msgbuf << "Error while parsing command-line options: " << ex.what();
Log(LogCritical, "icinga-app", msgbuf.str());
return EXIT_FAILURE;
}
po::notify(g_AppParams);
#ifndef _WIN32
if (g_AppParams.count("group")) {
String group = g_AppParams["group"].as<String>();
errno = 0;
struct group *gr = getgrnam(group.CStr());
if (!gr) {
BOOST_THROW_EXCEPTION(posix_error()
<< boost::errinfo_api_function("getpwnam")
<< boost::errinfo_errno(errno));
}
if (setgid(gr->gr_gid) < 0) {
BOOST_THROW_EXCEPTION(posix_error()
<< boost::errinfo_api_function("setgid")
<< boost::errinfo_errno(errno));
}
}
if (g_AppParams.count("user")) {
String user = g_AppParams["user"].as<String>();
errno = 0;
struct passwd *pw = getpwnam(user.CStr());
if (!pw) {
BOOST_THROW_EXCEPTION(posix_error()
<< boost::errinfo_api_function("getpwnam")
<< boost::errinfo_errno(errno));
}
if (setuid(pw->pw_uid) < 0) {
BOOST_THROW_EXCEPTION(posix_error()
<< boost::errinfo_api_function("setuid")
<< boost::errinfo_errno(errno));
}
}
#endif /* _WIN32 */
if (g_AppParams.count("debug"))
Application::SetDebugging(true);
if (g_AppParams.count("help") || g_AppParams.count("version")) {
String appName = Utility::BaseName(argv[0]);
if (appName.GetLength() > 3 && appName.SubStr(0, 3) == "lt-")
appName = appName.SubStr(3, appName.GetLength() - 3);
std::cout << appName << " " << "- The Icinga 2 network monitoring daemon.";
if (g_AppParams.count("version")) {
#ifndef _WIN32
std::cout << " (Version: " << ICINGA_VERSION << ")";
#endif /* _WIN32 */
std::cout << std::endl
<< "Copyright (c) 2012-2013 Icinga Development Team (http://www.icinga.org)" << std::endl
<< "License GPLv2+: GNU GPL version 2 or later <http://gnu.org/licenses/gpl2.html>" << std::endl
<< "This is free software: you are free to change and redistribute it." << std::endl
<< "There is NO WARRANTY, to the extent permitted by law.";
}
std::cout << std::endl;
if (g_AppParams.count("version"))
return EXIT_SUCCESS;
}
if (g_AppParams.count("help")) {
std::cout << std::endl
<< desc << std::endl
<< "Report bugs at <https://dev.icinga.org/>" << std::endl
<< "Icinga home page: <http://www.icinga.org/>" << std::endl;
return EXIT_SUCCESS;
}
Log(LogInformation, "icinga-app", "Icinga application loader"
#ifndef _WIN32
" (version: " ICINGA_VERSION ")"
#endif /* _WIN32 */
);
String searchDir = Application::GetPkgLibDir();
Log(LogInformation, "base", "Adding library search dir: " + searchDir);
#ifdef _WIN32
SetDllDirectory(searchDir.CStr());
#else /* _WIN32 */
lt_dladdsearchdir(searchDir.CStr());
#endif /* _WIN32 */
(void) Utility::LoadExtensionLibrary("icinga");
if (g_AppParams.count("library")) {
BOOST_FOREACH(const String& libraryName, g_AppParams["library"].as<std::vector<String> >()) {
(void) Utility::LoadExtensionLibrary(libraryName);
}
}
ConfigCompiler::AddIncludeSearchDir(Application::GetPkgDataDir());
if (g_AppParams.count("include")) {
BOOST_FOREACH(const String& includePath, g_AppParams["include"].as<std::vector<String> >()) {
ConfigCompiler::AddIncludeSearchDir(includePath);
}
}
if (g_AppParams.count("config") == 0) {
Log(LogCritical, "icinga-app", "You need to specify at least one config file (using the --config option).");
return EXIT_FAILURE;
}
if (g_AppParams.count("daemonize")) {
String errorLog;
if (g_AppParams.count("errorlog"))
errorLog = g_AppParams["errorlog"].as<String>();
Daemonize(errorLog);
}
bool validateOnly = g_AppParams.count("validate");
if (!LoadConfigFiles(validateOnly))
return EXIT_FAILURE;
if (validateOnly) {
Log(LogInformation, "icinga-app", "Finished validating the configuration file(s).");
return EXIT_SUCCESS;
}
#ifndef _WIN32
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
sa.sa_handler = &SigHupHandler;
sigaction(SIGHUP, &sa, NULL);
#endif /* _WIN32 */
return Application::GetInstance()->Run();
}
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