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icinga2/lib/base/application.cpp

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/******************************************************************************
* Icinga 2 *
* 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 "base/application.hpp"
#include "base/application.tcpp"
#include "base/stacktrace.hpp"
#include "base/timer.hpp"
#include "base/logger.hpp"
#include "base/exception.hpp"
#include "base/objectlock.hpp"
#include "base/utility.hpp"
#include "base/loader.hpp"
#include "base/debug.hpp"
#include "base/type.hpp"
#include "base/convert.hpp"
#include "base/scriptglobal.hpp"
#include "base/process.hpp"
#include <boost/algorithm/string/classification.hpp>
#include <boost/foreach.hpp>
#include <boost/algorithm/string/split.hpp>
#include <boost/algorithm/string/trim.hpp>
#include <boost/exception/errinfo_api_function.hpp>
#include <boost/exception/errinfo_errno.hpp>
#include <boost/exception/errinfo_file_name.hpp>
#include <sstream>
#include <iostream>
#include <fstream>
#ifdef __linux__
#include <sys/prctl.h>
#endif /* __linux__ */
#ifdef _WIN32
#include <VersionHelpers.h>
#endif /*_WIN32*/
using namespace icinga;
REGISTER_TYPE(Application);
boost::signals2::signal<void (void)> Application::OnReopenLogs;
Application::Ptr Application::m_Instance = NULL;
bool Application::m_ShuttingDown = false;
bool Application::m_RequestRestart = false;
bool Application::m_RequestReopenLogs = false;
pid_t Application::m_ReloadProcess = 0;
static bool l_Restarting = false;
static bool l_InExceptionHandler = false;
int Application::m_ArgC;
char **Application::m_ArgV;
double Application::m_StartTime;
/**
* Constructor for the Application class.
*/
void Application::OnConfigLoaded(void)
{
m_PidFile = NULL;
ASSERT(m_Instance == NULL);
m_Instance = this;
}
/**
* Destructor for the application class.
*/
void Application::Stop(void)
{
m_ShuttingDown = true;
#ifdef _WIN32
WSACleanup();
#endif /* _WIN32 */
// Getting a shutdown-signal when a restart is in progress usually
// means that the restart succeeded and the new process wants to take
// over. Write the PID of the new process to the pidfile before this
// process exits to keep systemd happy.
if (l_Restarting) {
try {
UpdatePidFile(GetPidPath(), m_ReloadProcess);
} catch (const std::exception&) {
/* abort restart */
Log(LogCritical, "Application", "Cannot update PID file. Aborting restart operation.");
return;
}
ClosePidFile(false);
} else
ClosePidFile(true);
DynamicObject::Stop();
}
Application::~Application(void)
{
m_Instance = NULL;
}
void Application::Exit(int rc)
{
std::cout.flush();
std::cerr.flush();
BOOST_FOREACH(const Logger::Ptr& logger, Logger::GetLoggers()) {
logger->Flush();
}
UninitializeBase();
#ifdef I2_DEBUG
exit(rc);
#else /* I2_DEBUG */
_exit(rc); // Yay, our static destructors are pretty much beyond repair at this point.
#endif /* I2_DEBUG */
}
void Application::InitializeBase(void)
{
#ifdef _WIN32
/* disable GUI-based error messages for LoadLibrary() */
SetErrorMode(SEM_FAILCRITICALERRORS);
WSADATA wsaData;
if (WSAStartup(MAKEWORD(1, 1), &wsaData) != 0) {
BOOST_THROW_EXCEPTION(win32_error()
<< boost::errinfo_api_function("WSAStartup")
<< errinfo_win32_error(WSAGetLastError()));
}
#endif /* _WIN32 */
Loader::ExecuteDeferredInitializers();
/* make sure the thread pool gets initialized */
GetTP();
Timer::Initialize();
}
void Application::UninitializeBase(void)
{
Timer::Uninitialize();
GetTP().Stop();
}
/**
* Retrieves a pointer to the application singleton object.
*
* @returns The application object.
*/
Application::Ptr Application::GetInstance(void)
{
return m_Instance;
}
void Application::SetResourceLimits(void)
{
#ifdef __linux__
rlimit rl;
# ifdef RLIMIT_NOFILE
rl.rlim_cur = 16 * 1024;
rl.rlim_max = rl.rlim_cur;
if (setrlimit(RLIMIT_NOFILE, &rl) < 0)
Log(LogNotice, "Application", "Could not adjust resource limit for open file handles (RLIMIT_NOFILE)");
# else /* RLIMIT_NOFILE */
Log(LogNotice, "Application", "System does not support adjusting the resource limit for open file handles (RLIMIT_NOFILE)");
# endif /* RLIMIT_NOFILE */
# ifdef RLIMIT_NPROC
rl.rlim_cur = 16 * 1024;
rl.rlim_max = rl.rlim_cur;
if (setrlimit(RLIMIT_NPROC, &rl) < 0)
Log(LogNotice, "Application", "Could not adjust resource limit for number of processes (RLIMIT_NPROC)");
# else /* RLIMIT_NPROC */
Log(LogNotice, "Application", "System does not support adjusting the resource limit for number of processes (RLIMIT_NPROC)");
# endif /* RLIMIT_NPROC */
# ifdef RLIMIT_STACK
int argc = Application::GetArgC();
char **argv = Application::GetArgV();
bool set_stack_rlimit = true;
for (int i = 0; i < argc; i++) {
if (strcmp(argv[i], "--no-stack-rlimit") == 0) {
set_stack_rlimit = false;
break;
}
}
if (getrlimit(RLIMIT_STACK, &rl) < 0) {
Log(LogWarning, "Application", "Could not determine resource limit for stack size (RLIMIT_STACK)");
rl.rlim_max = RLIM_INFINITY;
}
if (set_stack_rlimit)
rl.rlim_cur = 256 * 1024;
else
rl.rlim_cur = rl.rlim_max;
if (setrlimit(RLIMIT_STACK, &rl) < 0)
Log(LogNotice, "Application", "Could not adjust resource limit for stack size (RLIMIT_STACK)");
else if (set_stack_rlimit) {
char **new_argv = static_cast<char **>(malloc(sizeof(char *) * (argc + 2)));
if (!new_argv) {
perror("malloc");
Exit(EXIT_FAILURE);
}
new_argv[0] = argv[0];
new_argv[1] = strdup("--no-stack-rlimit");
if (!new_argv[1]) {
perror("strdup");
exit(1);
}
for (int i = 1; i < argc; i++)
new_argv[i + 1] = argv[i];
new_argv[argc + 1] = NULL;
(void) execvp(new_argv[0], new_argv);
perror("execvp");
_exit(EXIT_FAILURE);
}
# else /* RLIMIT_STACK */
Log(LogNotice, "Application", "System does not support adjusting the resource limit for stack size (RLIMIT_STACK)");
# endif /* RLIMIT_STACK */
#endif /* __linux__ */
}
int Application::GetArgC(void)
{
return m_ArgC;
}
void Application::SetArgC(int argc)
{
m_ArgC = argc;
}
char **Application::GetArgV(void)
{
return m_ArgV;
}
void Application::SetArgV(char **argv)
{
m_ArgV = argv;
}
/**
* Processes events for registered sockets and timers and calls whatever
* handlers have been set up for these events.
*/
void Application::RunEventLoop(void)
{
Timer::Initialize();
double lastLoop = Utility::GetTime();
mainloop:
while (!m_ShuttingDown && !m_RequestRestart) {
/* Watches for changes to the system time. Adjusts timers if necessary. */
Utility::Sleep(2.5);
if (m_RequestReopenLogs) {
Log(LogNotice, "Application", "Reopening log files");
m_RequestReopenLogs = false;
OnReopenLogs();
}
double now = Utility::GetTime();
double timeDiff = lastLoop - now;
if (std::fabs(timeDiff) > 15) {
/* We made a significant jump in time. */
Log(LogInformation, "Application")
<< "We jumped "
<< (timeDiff < 0 ? "forward" : "backward")
<< " in time: " << std::fabs(timeDiff) << " seconds";
Timer::AdjustTimers(-timeDiff);
}
lastLoop = now;
}
if (m_RequestRestart) {
m_RequestRestart = false; // we are now handling the request, once is enough
// are we already restarting? ignore request if we already are
if (l_Restarting)
goto mainloop;
l_Restarting = true;
m_ReloadProcess = StartReloadProcess();
goto mainloop;
}
Log(LogInformation, "Application", "Shutting down...");
DynamicObject::StopObjects();
Application::GetInstance()->OnShutdown();
UninitializeBase();
}
void Application::OnShutdown(void)
{
/* Nothing to do here. */
}
static void ReloadProcessCallback(const ProcessResult& pr)
{
if (pr.ExitStatus != 0)
Log(LogCritical, "Application", "Found error in config: reloading aborted");
l_Restarting = false;
}
pid_t Application::StartReloadProcess(void)
{
Log(LogInformation, "Application", "Got reload command: Starting new instance.");
// prepare arguments
Array::Ptr args = new Array();
args->Add(GetExePath(m_ArgV[0]));
for (int i=1; i < Application::GetArgC(); i++) {
if (std::string(Application::GetArgV()[i]) != "--reload-internal")
args->Add(Application::GetArgV()[i]);
else
i++; // the next parameter after --reload-internal is the pid, remove that too
}
args->Add("--reload-internal");
args->Add(Convert::ToString(Utility::GetPid()));
Process::Ptr process = new Process(Process::PrepareCommand(args));
process->SetTimeout(300);
process->Run(&ReloadProcessCallback);
return process->GetPID();
}
/**
* Signals the application to shut down during the next
* execution of the event loop.
*/
void Application::RequestShutdown(void)
{
Log(LogInformation, "Application", "Received request to shut down.");
m_ShuttingDown = true;
}
/**
* Signals the application to restart during the next
* execution of the event loop.
*/
void Application::RequestRestart(void)
{
m_RequestRestart = true;
}
/**
* Signals the application to reopen log files during the
* next execution of the event loop.
*/
void Application::RequestReopenLogs(void)
{
m_RequestReopenLogs = true;
}
/**
* Retrieves the full path of the executable.
*
* @param argv0 The first command-line argument.
* @returns The path.
*/
String Application::GetExePath(const String& argv0)
{
String executablePath;
#ifndef _WIN32
char buffer[MAXPATHLEN];
if (getcwd(buffer, sizeof(buffer)) == NULL) {
BOOST_THROW_EXCEPTION(posix_error()
<< boost::errinfo_api_function("getcwd")
<< boost::errinfo_errno(errno));
}
String workingDirectory = buffer;
if (argv0[0] != '/')
executablePath = workingDirectory + "/" + argv0;
else
executablePath = argv0;
bool foundSlash = false;
for (size_t i = 0; i < argv0.GetLength(); i++) {
if (argv0[i] == '/') {
foundSlash = true;
break;
}
}
if (!foundSlash) {
const char *pathEnv = getenv("PATH");
if (pathEnv != NULL) {
std::vector<String> paths;
boost::algorithm::split(paths, pathEnv, boost::is_any_of(":"));
bool foundPath = false;
BOOST_FOREACH(String& path, paths) {
String pathTest = path + "/" + argv0;
if (access(pathTest.CStr(), X_OK) == 0) {
executablePath = pathTest;
foundPath = true;
break;
}
}
if (!foundPath) {
executablePath.Clear();
BOOST_THROW_EXCEPTION(std::runtime_error("Could not determine executable path."));
}
}
}
if (realpath(executablePath.CStr(), buffer) == NULL) {
BOOST_THROW_EXCEPTION(posix_error()
<< boost::errinfo_api_function("realpath")
<< boost::errinfo_errno(errno)
<< boost::errinfo_file_name(executablePath));
}
return buffer;
#else /* _WIN32 */
char FullExePath[MAXPATHLEN];
if (!GetModuleFileName(NULL, FullExePath, sizeof(FullExePath)))
BOOST_THROW_EXCEPTION(win32_error()
<< boost::errinfo_api_function("GetModuleFileName")
<< errinfo_win32_error(GetLastError()));
return FullExePath;
#endif /* _WIN32 */
}
#ifndef _WIN32
static String UnameHelper(char type)
{
/* Unfortunately the uname() system call doesn't support some of the
* query types we're interested in - so we're using popen() instead. */
char cmd[] = "uname -X 2>&1";
cmd[7] = type;
FILE *fp = popen(cmd, "r");
char line[1024];
std::ostringstream msgbuf;
while (fgets(line, sizeof(line), fp) != NULL)
msgbuf << line;
pclose(fp);
String result = msgbuf.str();
result.Trim();
return result;
}
int ReleaseHelper(std::string &result)
{
/* You are useing *some* distribution */
FILE *fp = popen("lsb_release -s -d 2>&1", "r");
std::ostringstream msgbuf;
if (fp != NULL) {
char line[1024];
while (fgets(line, sizeof(line), fp) != NULL)
msgbuf << line;
int status = pclose(fp);
if (WEXITSTATUS(status) == 0) {
result = msgbuf.str();
boost::trim(result);
return result.length();
}
}
/* You have systemd or Ubuntu etc. */
std::ifstream release("/etc/os-release");
std::string release_line;
if (release.is_open()) {
while (getline(release, release_line)) {
if (release_line.find("PRETTY_NAME") != std::string::npos) {
result = release_line.substr(13, release_line.length() - 14);
return result.length();
}
}
}
/* Centos < 7 */
release.close();
release.open("/etc/redhat-release");
if (release.is_open()) {
getline(release, release_line);
result = release_line;
return result.length();
}
/* sles 11 sp3, opensuse w/e */
release.close();
release.open("etc/SuSE-release");
if (release.is_open()) {
getline(release, release_line);
result = release_line;
return result.length();
}
/* Just give up */
return 0;
}
#else
static String WindowsVersionHelper()
{
//Minimum required Version, the installer/user is in the responsibility to take care of that
String winver = "Windows Vista";
if (IsWindowsVistaSP1OrGreater())
winver = "Windows Vista SP1";
if (IsWindowsVistaSP2OrGreater())
winver = "Windows Vista SP2";
if (IsWindows7OrGreater())
winver = "Windows 7";
if (IsWindows7SP1OrGreater())
winver = "Windows 7 SP1";
if (IsWindows8OrGreater())
winver = "Windows 8";
if (IsWindows8Point1OrGreater())
winver = "Windows 8.1 or greater";
if (IsWindowsServer())
winver += " (Server)";
return winver;
}
#endif /* _WIN32 */
/**
* Display version and path information.
*/
void Application::DisplayInfoMessage(std::ostream& os, bool skipVersion)
{
os << "Application information:" << "\n";
if (!skipVersion)
os << " Application version: " << GetVersion() << "\n";
os << " Installation root: " << GetPrefixDir() << "\n"
<< " Sysconf directory: " << GetSysconfDir() << "\n"
<< " Run directory: " << GetRunDir() << "\n"
<< " Local state directory: " << GetLocalStateDir() << "\n"
<< " Package data directory: " << GetPkgDataDir() << "\n"
<< " State path: " << GetStatePath() << "\n"
<< " Objects path: " << GetObjectsPath() << "\n"
<< " Vars path: " << GetVarsPath() << "\n"
<< " PID path: " << GetPidPath() << "\n";
#ifndef _WIN32
os << "\n"
<< "System information:" << "\n"
<< " Operating system: " << UnameHelper('s') << "\n"
<< " Operating system version: " << UnameHelper('r') << "\n"
<< " Architecture: " << UnameHelper('m') << "\n";
#else
os << "\n"
<< "System information:\n"
<< " Operating system: Windows\n"
<< " Operating system version: " << WindowsVersionHelper() << "\n";
#endif /* _WIN32 */
#ifdef __linux__
std::string release;
if (ReleaseHelper(release))
os << " Distribution: " << release << "\n";
#endif /* __linux__ */
}
/**
* Displays a message that tells users what to do when they encounter a bug.
*/
void Application::DisplayBugMessage(std::ostream& os)
{
os << "***" << "\n"
<< "* This would indicate a runtime problem or configuration error. If you believe this is a bug in Icinga 2" << "\n"
<< "* please submit a bug report at https://dev.icinga.org/ and include this stack trace as well as any other" << "\n"
<< "* information that might be useful in order to reproduce this problem." << "\n"
<< "***" << "\n";
}
String Application::GetCrashReportFilename(void)
{
return GetLocalStateDir() + "/log/icinga2/crash/report." + Convert::ToString(Utility::GetTime());
}
#ifndef _WIN32
void Application::GetDebuggerBacktrace(const String& filename)
{
#ifdef __linux__
prctl(PR_SET_DUMPABLE, 1);
#endif /* __linux __ */
String my_pid = Convert::ToString(Utility::GetPid());
pid_t pid = fork();
if (pid < 0) {
BOOST_THROW_EXCEPTION(posix_error()
<< boost::errinfo_api_function("fork")
<< boost::errinfo_errno(errno));
}
if (pid == 0) {
int fd = open(filename.CStr(), O_CREAT | O_RDWR | O_APPEND, 0600);
if (fd < 0) {
BOOST_THROW_EXCEPTION(posix_error()
<< boost::errinfo_api_function("open")
<< boost::errinfo_errno(errno)
<< boost::errinfo_file_name(filename));
}
if (fd != 1) {
/* redirect stdout to the file */
dup2(fd, 1);
close(fd);
}
/* redirect stderr to stdout */
if (fd != 2)
close(2);
dup2(1, 2);
char *my_pid_str = strdup(my_pid.CStr());
const char *argv[] = {
"gdb",
"--batch",
"-p",
my_pid_str,
"-ex",
"thread apply all bt full",
"-ex",
"detach",
"-ex",
"quit",
NULL
};
(void)execvp(argv[0], const_cast<char **>(argv));
perror("Failed to launch GDB");
free(my_pid_str);
_exit(0);
}
int status;
if (waitpid(pid, &status, 0) < 0) {
BOOST_THROW_EXCEPTION(posix_error()
<< boost::errinfo_api_function("waitpid")
<< boost::errinfo_errno(errno));
}
#ifdef __linux__
prctl(PR_SET_DUMPABLE, 0);
#endif /* __linux __ */
}
/**
* Signal handler for SIGINT and SIGTERM. Prepares the application for cleanly
* shutting down during the next execution of the event loop.
*
* @param - The signal number.
*/
void Application::SigIntTermHandler(int signum)
{
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
sa.sa_handler = SIG_DFL;
sigaction(signum, &sa, NULL);
Application::Ptr instance = Application::GetInstance();
if (!instance)
return;
instance->RequestShutdown();
}
/**
* Signal handler for SIGUSR1. This signal causes Icinga to re-open
* its log files and is mainly for use by logrotate.
*
* @param - The signal number.
*/
void Application::SigUsr1Handler(int)
{
RequestReopenLogs();
}
/**
* Signal handler for SIGABRT. Helps with debugging ASSERT()s.
*
* @param - The signal number.
*/
void Application::SigAbrtHandler(int)
{
#ifndef _WIN32
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
sa.sa_handler = SIG_DFL;
sigaction(SIGABRT, &sa, NULL);
#endif /* _WIN32 */
std::cerr << "Caught SIGABRT." << std::endl
<< "Current time: " << Utility::FormatDateTime("%Y-%m-%d %H:%M:%S %z", Utility::GetTime()) << std::endl
<< std::endl;
String fname = GetCrashReportFilename();
Utility::MkDir(Utility::DirName(fname), 0750);
std::ofstream ofs;
ofs.open(fname.CStr());
Log(LogCritical, "Application")
<< "Icinga 2 has terminated unexpectedly. Additional information can be found in '" << fname << "'" << "\n";
DisplayInfoMessage(ofs);
StackTrace trace;
ofs << "Stacktrace:" << "\n";
trace.Print(ofs, 1);
DisplayBugMessage(ofs);
#ifndef _WIN32
ofs << "\n";
ofs.close();
GetDebuggerBacktrace(fname);
#else /* _WIN32 */
ofs.close();
#endif /* _WIN32 */
}
#else /* _WIN32 */
/**
* Console control handler. Prepares the application for cleanly
* shutting down during the next execution of the event loop.
*/
BOOL WINAPI Application::CtrlHandler(DWORD type)
{
Application::Ptr instance = Application::GetInstance();
if (!instance)
return TRUE;
instance->RequestShutdown();
SetConsoleCtrlHandler(NULL, FALSE);
return TRUE;
}
#endif /* _WIN32 */
/**
* Handler for unhandled exceptions.
*/
void Application::ExceptionHandler(void)
{
if (l_InExceptionHandler)
for (;;)
Utility::Sleep(5);
l_InExceptionHandler = true;
#ifndef _WIN32
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
sa.sa_handler = SIG_DFL;
sigaction(SIGABRT, &sa, NULL);
#endif /* _WIN32 */
String fname = GetCrashReportFilename();
Utility::MkDir(Utility::DirName(fname), 0750);
std::ofstream ofs;
ofs.open(fname.CStr());
ofs << "Caught unhandled exception." << "\n"
<< "Current time: " << Utility::FormatDateTime("%Y-%m-%d %H:%M:%S %z", Utility::GetTime()) << "\n"
<< "\n";
DisplayInfoMessage(ofs);
try {
RethrowUncaughtException();
} catch (const std::exception& ex) {
Log(LogCritical, "Application")
<< DiagnosticInformation(ex, false) << "\n"
<< "\n"
<< "Additional information is available in '" << fname << "'" << "\n";
ofs << "\n"
<< DiagnosticInformation(ex)
<< "\n";
}
DisplayBugMessage(ofs);
ofs.close();
#ifndef _WIN32
GetDebuggerBacktrace(fname);
#endif /* _WIN32 */
abort();
}
#ifdef _WIN32
LONG CALLBACK Application::SEHUnhandledExceptionFilter(PEXCEPTION_POINTERS exi)
{
if (l_InExceptionHandler)
return EXCEPTION_CONTINUE_SEARCH;
l_InExceptionHandler = true;
String fname = GetCrashReportFilename();
Utility::MkDir(Utility::DirName(fname), 0750);
std::ofstream ofs;
ofs.open(fname.CStr());
Log(LogCritical, "Application")
<< "Icinga 2 has terminated unexpectedly. Additional information can be found in '" << fname << "'";
DisplayInfoMessage(ofs);
ofs << "Caught unhandled SEH exception." << "\n"
<< "Current time: " << Utility::FormatDateTime("%Y-%m-%d %H:%M:%S %z", Utility::GetTime()) << "\n"
<< "\n";
StackTrace trace(exi);
ofs << "Stacktrace:" << "\n";
trace.Print(ofs, 1);
DisplayBugMessage(ofs);
return EXCEPTION_CONTINUE_SEARCH;
}
#endif /* _WIN32 */
/**
* Installs the exception handlers.
*/
void Application::InstallExceptionHandlers(void)
{
std::set_terminate(&Application::ExceptionHandler);
#ifndef _WIN32
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
sa.sa_handler = &Application::SigAbrtHandler;
sigaction(SIGABRT, &sa, NULL);
#else /* _WIN32 */
SetUnhandledExceptionFilter(&Application::SEHUnhandledExceptionFilter);
#endif /* _WIN32 */
}
/**
* Runs the application.
*
* @returns The application's exit code.
*/
int Application::Run(void)
{
#ifndef _WIN32
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
sa.sa_handler = &Application::SigIntTermHandler;
sigaction(SIGINT, &sa, NULL);
sigaction(SIGTERM, &sa, NULL);
sa.sa_handler = SIG_IGN;
sigaction(SIGPIPE, &sa, NULL);
sa.sa_handler = &Application::SigUsr1Handler;
sigaction(SIGUSR1, &sa, NULL);
#else /* _WIN32 */
SetConsoleCtrlHandler(&Application::CtrlHandler, TRUE);
#endif /* _WIN32 */
try {
UpdatePidFile(GetPidPath());
} catch (const std::exception&) {
Log(LogCritical, "Application")
<< "Cannot update PID file '" << GetPidPath() << "'. Aborting.";
return EXIT_FAILURE;
}
return Main();
}
/**
* Grabs the PID file lock and updates the PID. Terminates the application
* if the PID file is already locked by another instance of the application.
*
* @param filename The name of the PID file.
* @param pid The PID to write; default is the current PID
*/
void Application::UpdatePidFile(const String& filename, pid_t pid)
{
ASSERT(!OwnsLock());
ObjectLock olock(this);
if (m_PidFile != NULL)
fclose(m_PidFile);
/* There's just no sane way of getting a file descriptor for a
* C++ ofstream which is why we're using FILEs here. */
m_PidFile = fopen(filename.CStr(), "r+");
if (m_PidFile == NULL)
m_PidFile = fopen(filename.CStr(), "w");
if (m_PidFile == NULL) {
Log(LogCritical, "Application")
<< "Could not open PID file '" << filename << "'.";
BOOST_THROW_EXCEPTION(std::runtime_error("Could not open PID file '" + filename + "'"));
}
#ifndef _WIN32
int fd = fileno(m_PidFile);
Utility::SetCloExec(fd);
struct flock lock;
lock.l_start = 0;
lock.l_len = 0;
lock.l_type = F_WRLCK;
lock.l_whence = SEEK_SET;
if (fcntl(fd, F_SETLK, &lock) < 0) {
Log(LogCritical, "Application", "Could not lock PID file. Make sure that only one instance of the application is running.");
Application::Exit(EXIT_FAILURE);
}
if (ftruncate(fd, 0) < 0) {
Log(LogCritical, "Application")
<< "ftruncate() failed with error code " << errno << ", \"" << Utility::FormatErrorNumber(errno) << "\"";
BOOST_THROW_EXCEPTION(posix_error()
<< boost::errinfo_api_function("ftruncate")
<< boost::errinfo_errno(errno));
}
#endif /* _WIN32 */
fprintf(m_PidFile, "%lu\n", (unsigned long)pid);
fflush(m_PidFile);
}
/**
* Closes the PID file. Does nothing if the PID file is not currently open.
*/
void Application::ClosePidFile(bool unlink)
{
ASSERT(!OwnsLock());
ObjectLock olock(this);
if (m_PidFile != NULL)
{
if (unlink) {
String pidpath = GetPidPath();
::unlink(pidpath.CStr());
}
fclose(m_PidFile);
}
m_PidFile = NULL;
}
/**
* Checks if another process currently owns the pidfile and read it
*
* @param filename The name of the PID file.
* @returns 0: no process owning the pidfile, pid of the process otherwise
*/
pid_t Application::ReadPidFile(const String& filename)
{
FILE *pidfile = fopen(filename.CStr(), "r");
if (pidfile == NULL)
return 0;
#ifndef _WIN32
int fd = fileno(pidfile);
struct flock lock;
lock.l_start = 0;
lock.l_len = 0;
lock.l_type = F_WRLCK;
lock.l_whence = SEEK_SET;
if (fcntl(fd, F_GETLK, &lock) < 0) {
int error = errno;
fclose(pidfile);
BOOST_THROW_EXCEPTION(posix_error()
<< boost::errinfo_api_function("fcntl")
<< boost::errinfo_errno(error));
}
if (lock.l_type == F_UNLCK) {
// nobody has locked the file: no icinga running
fclose(pidfile);
return -1;
}
#endif /* _WIN32 */
pid_t runningpid;
int res = fscanf(pidfile, "%d", &runningpid);
fclose(pidfile);
// bogus result?
if (res != 1)
return 0;
#ifdef _WIN32
HANDLE hProcess = OpenProcess(0, FALSE, runningpid);
if (!hProcess)
return 0;
CloseHandle(hProcess);
#endif /* _WIN32 */
return runningpid;
}
/**
* Retrieves the path of the installation prefix.
*
* @returns The path.
*/
String Application::GetPrefixDir(void)
{
return ScriptGlobal::Get("PrefixDir");
}
/**
* Sets the path for the installation prefix.
*
* @param path The new path.
*/
void Application::DeclarePrefixDir(const String& path)
{
if (!ScriptGlobal::Exists("PrefixDir"))
ScriptGlobal::Set("PrefixDir", path);
}
/**
* Retrives the path of the sysconf dir.
*
* @returns The path.
*/
String Application::GetSysconfDir(void)
{
return ScriptGlobal::Get("SysconfDir");
}
/**
* Sets the path of the sysconf dir.
*
* @param path The new path.
*/
void Application::DeclareSysconfDir(const String& path)
{
if (!ScriptGlobal::Exists("SysconfDir"))
ScriptGlobal::Set("SysconfDir", path);
}
/**
* Retrieves the path for the run dir.
*
* @returns The path.
*/
String Application::GetRunDir(void)
{
return ScriptGlobal::Get("RunDir");
}
/**
* Sets the path of the run dir.
*
* @param path The new path.
*/
void Application::DeclareRunDir(const String& path)
{
if (!ScriptGlobal::Exists("RunDir"))
ScriptGlobal::Set("RunDir", path);
}
/**
* Retrieves the path for the local state dir.
*
* @returns The path.
*/
String Application::GetLocalStateDir(void)
{
return ScriptGlobal::Get("LocalStateDir");
}
/**
* Sets the path for the local state dir.
*
* @param path The new path.
*/
void Application::DeclareLocalStateDir(const String& path)
{
if (!ScriptGlobal::Exists("LocalStateDir"))
ScriptGlobal::Set("LocalStateDir", path);
}
/**
* Retrieves the path for the local state dir.
*
* @returns The path.
*/
String Application::GetZonesDir(void)
{
return ScriptGlobal::Get("ZonesDir", &Empty);
}
/**
* Sets the path of the zones dir.
*
* @param path The new path.
*/
void Application::DeclareZonesDir(const String& path)
{
if (!ScriptGlobal::Exists("ZonesDir"))
ScriptGlobal::Set("ZonesDir", path);
}
/**
* Retrieves the path for the package data dir.
*
* @returns The path.
*/
String Application::GetPkgDataDir(void)
{
String defaultValue = "";
return ScriptGlobal::Get("PkgDataDir", &Empty);
}
/**
* Sets the path for the package data dir.
*
* @param path The new path.
*/
void Application::DeclarePkgDataDir(const String& path)
{
if (!ScriptGlobal::Exists("PkgDataDir"))
ScriptGlobal::Set("PkgDataDir", path);
}
/**
* Retrieves the path for the include conf dir.
*
* @returns The path.
*/
String Application::GetIncludeConfDir(void)
{
return ScriptGlobal::Get("IncludeConfDir", &Empty);
}
/**
* Sets the path for the package data dir.
*
* @param path The new path.
*/
void Application::DeclareIncludeConfDir(const String& path)
{
if (!ScriptGlobal::Exists("IncludeConfDir"))
ScriptGlobal::Set("IncludeConfDir", path);
}
/**
* Retrieves the path for the state file.
*
* @returns The path.
*/
String Application::GetStatePath(void)
{
return ScriptGlobal::Get("StatePath", &Empty);
}
/**
* Sets the path for the state file.
*
* @param path The new path.
*/
void Application::DeclareStatePath(const String& path)
{
if (!ScriptGlobal::Exists("StatePath"))
ScriptGlobal::Set("StatePath", path);
}
/**
* Retrieves the path for the objects file.
*
* @returns The path.
*/
String Application::GetObjectsPath(void)
{
return ScriptGlobal::Get("ObjectsPath", &Empty);
}
/**
* Sets the path for the objects file.
*
* @param path The new path.
*/
void Application::DeclareObjectsPath(const String& path)
{
if (!ScriptGlobal::Exists("ObjectsPath"))
ScriptGlobal::Set("ObjectsPath", path);
}
/**
* Retrieves the path for the vars file.
*
* @returns The path.
*/
String Application::GetVarsPath(void)
{
return ScriptGlobal::Get("VarsPath", &Empty);
}
/**
* Sets the path for the vars file.
*
* @param path The new path.
*/
void Application::DeclareVarsPath(const String& path)
{
if (!ScriptGlobal::Exists("VarsPath"))
ScriptGlobal::Set("VarsPath", path);
}
/**
* Retrieves the path for the PID file.
*
* @returns The path.
*/
String Application::GetPidPath(void)
{
return ScriptGlobal::Get("PidPath", &Empty);
}
/**
* Sets the path for the PID file.
*
* @param path The new path.
*/
void Application::DeclarePidPath(const String& path)
{
if (!ScriptGlobal::Exists("PidPath"))
ScriptGlobal::Set("PidPath", path);
}
/**
* Retrieves the name of the user.
*
* @returns The name.
*/
String Application::GetRunAsUser(void)
{
return ScriptGlobal::Get("RunAsUser");
}
/**
* Sets the name of the user.
*
* @param path The new user name.
*/
void Application::DeclareRunAsUser(const String& user)
{
if (!ScriptGlobal::Exists("RunAsUser"))
ScriptGlobal::Set("RunAsUser", user);
}
/**
* Retrieves the name of the group.
*
* @returns The name.
*/
String Application::GetRunAsGroup(void)
{
return ScriptGlobal::Get("RunAsGroup");
}
/**
* Sets the concurrency level.
*
* @param path The new concurrency level.
*/
void Application::DeclareConcurrency(int ncpus)
{
if (!ScriptGlobal::Exists("Concurrency"))
ScriptGlobal::Set("Concurrency", ncpus);
}
/**
* Retrieves the concurrency level.
*
* @returns The concurrency level.
*/
int Application::GetConcurrency(void)
{
Value defaultConcurrency = boost::thread::hardware_concurrency();
return ScriptGlobal::Get("Concurrency", &defaultConcurrency);
}
/**
* Sets the name of the group.
*
* @param path The new group name.
*/
void Application::DeclareRunAsGroup(const String& group)
{
if (!ScriptGlobal::Exists("RunAsGroup"))
ScriptGlobal::Set("RunAsGroup", group);
}
/**
* Returns the global thread pool.
*
* @returns The global thread pool.
*/
ThreadPool& Application::GetTP(void)
{
static ThreadPool tp;
return tp;
}
double Application::GetStartTime(void)
{
return m_StartTime;
}
void Application::SetStartTime(double ts)
{
m_StartTime = ts;
}
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