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icinga2/lib/base/application.cpp

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/******************************************************************************
* Icinga 2 *
* Copyright (C) 2012-2018 Icinga Development Team (https://www.icinga.com/) *
* *
* 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-ti.cpp"
#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/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>
#include <thread>
#ifdef __linux__
#include <sys/prctl.h>
#endif /* __linux__ */
#ifdef _WIN32
#include <windows.h>
#endif /* _WIN32 */
#ifdef HAVE_SYSTEMD
#include <systemd/sd-daemon.h>
#endif /* HAVE_SYSTEMD */
using namespace icinga;
REGISTER_TYPE(Application);
boost::signals2::signal<void ()> Application::OnReopenLogs;
Application::Ptr Application::m_Instance = nullptr;
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;
double Application::m_MainTime;
bool Application::m_ScriptDebuggerEnabled = false;
double Application::m_LastReloadFailed;
/**
* Constructor for the Application class.
*/
void Application::OnConfigLoaded()
{
m_PidFile = nullptr;
ASSERT(m_Instance == nullptr);
m_Instance = this;
}
/**
* Destructor for the application class.
*/
void Application::Stop(bool runtimeRemoved)
{
m_ShuttingDown = true;
#ifdef _WIN32
WSACleanup();
#endif /* _WIN32 */
ClosePidFile(true);
ObjectImpl<Application>::Stop(runtimeRemoved);
}
Application::~Application()
{
m_Instance = nullptr;
}
void Application::Exit(int rc)
{
std::cout.flush();
std::cerr.flush();
for (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()
{
#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()));
}
#else /* _WIN32 */
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
sa.sa_handler = SIG_IGN;
sigaction(SIGPIPE, &sa, nullptr);
#endif /* _WIN32 */
Loader::ExecuteDeferredInitializers();
/* Make sure the thread pool gets initialized. */
GetTP().Start();
/* Make sure the timer thread gets initialized. */
Timer::Initialize();
}
void Application::UninitializeBase()
{
Timer::Uninitialize();
GetTP().Stop();
}
/**
* Retrieves a pointer to the application singleton object.
*
* @returns The application object.
*/
Application::Ptr Application::GetInstance()
{
return m_Instance;
}
void Application::SetResourceLimits()
{
#ifdef __linux__
rlimit rl;
# ifdef RLIMIT_NOFILE
rlim_t fileLimit = GetConst("RLimitFiles");
if (fileLimit != 0) {
if (fileLimit < GetDefaultRLimitFiles()) {
Log(LogWarning, "Application")
<< "The user-specified value for RLimitFiles cannot be smaller than the default value (" << GetDefaultRLimitFiles() << "). Using the default value instead.";
fileLimit = GetDefaultRLimitFiles();
}
rl.rlim_cur = fileLimit;
rl.rlim_max = rl.rlim_cur;
if (setrlimit(RLIMIT_NOFILE, &rl) < 0)
Log(LogWarning, "Application")
<< "Failed to adjust resource limit for open file handles (RLIMIT_NOFILE) with error \"" << strerror(errno) << "\"";
# 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
rlim_t processLimit = GetConst("RLimitProcesses");
if (processLimit != 0) {
if (processLimit < GetDefaultRLimitProcesses()) {
Log(LogWarning, "Application")
<< "The user-specified value for RLimitProcesses cannot be smaller than the default value (" << GetDefaultRLimitProcesses() << "). Using the default value instead.";
processLimit = GetDefaultRLimitProcesses();
}
rl.rlim_cur = processLimit;
rl.rlim_max = rl.rlim_cur;
if (setrlimit(RLIMIT_NPROC, &rl) < 0)
Log(LogWarning, "Application")
<< "Failed adjust resource limit for number of processes (RLIMIT_NPROC) with error \"" << strerror(errno) << "\"";
# 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;
}
rlim_t stackLimit;
stackLimit = GetConst("RLimitStack");
if (stackLimit != 0) {
if (stackLimit < GetDefaultRLimitStack()) {
Log(LogWarning, "Application")
<< "The user-specified value for RLimitStack cannot be smaller than the default value (" << GetDefaultRLimitStack() << "). Using the default value instead.";
stackLimit = GetDefaultRLimitStack();
}
if (set_stack_rlimit)
rl.rlim_cur = stackLimit;
else
rl.rlim_cur = rl.rlim_max;
if (setrlimit(RLIMIT_STACK, &rl) < 0)
Log(LogWarning, "Application")
<< "Failed adjust resource limit for stack size (RLIMIT_STACK) with error \"" << strerror(errno) << "\"";
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] = nullptr;
(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()
{
return m_ArgC;
}
void Application::SetArgC(int argc)
{
m_ArgC = argc;
}
char **Application::GetArgV()
{
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()
{
#ifdef HAVE_SYSTEMD
sd_notify(0, "READY=1");
#endif /* HAVE_SYSTEMD */
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;
#ifdef HAVE_SYSTEMD
sd_notify(0, "WATCHDOG=1");
#endif /* HAVE_SYSTEMD */
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
#ifdef HAVE_SYSTEMD
sd_notify(0, "RELOADING=1");
#endif /* HAVE_SYSTEMD */
// are we already restarting? ignore request if we already are
if (l_Restarting)
goto mainloop;
l_Restarting = true;
m_ReloadProcess = StartReloadProcess();
goto mainloop;
}
#ifdef HAVE_SYSTEMD
sd_notify(0, "STOPPING=1");
#endif /* HAVE_SYSTEMD */
Log(LogInformation, "Application", "Shutting down...");
ConfigObject::StopObjects();
Application::GetInstance()->OnShutdown();
UninitializeBase();
}
bool Application::IsShuttingDown()
{
return m_ShuttingDown;
}
void Application::OnShutdown()
{
/* Nothing to do here. */
}
static void ReloadProcessCallbackInternal(const ProcessResult& pr)
{
if (pr.ExitStatus != 0) {
Application::SetLastReloadFailed(Utility::GetTime());
Log(LogCritical, "Application", "Found error in config: reloading aborted");
}
#ifdef _WIN32
else
Application::Exit(7); /* keep this exit code in sync with icinga-app */
#endif /* _WIN32 */
}
static void ReloadProcessCallback(const ProcessResult& pr)
{
l_Restarting = false;
std::thread t(std::bind(&ReloadProcessCallbackInternal, pr));
t.detach();
}
pid_t Application::StartReloadProcess()
{
Log(LogInformation, "Application", "Got reload command: Starting new instance.");
// prepare arguments
ArrayData args;
args.push_back(GetExePath(m_ArgV[0]));
for (int i=1; i < Application::GetArgC(); i++) {
if (std::string(Application::GetArgV()[i]) != "--reload-internal")
args.push_back(Application::GetArgV()[i]);
else
i++; // the next parameter after --reload-internal is the pid, remove that too
}
#ifndef _WIN32
args.push_back("--reload-internal");
args.push_back(Convert::ToString(Utility::GetPid()));
#else /* _WIN32 */
args.push_back("--validate");
#endif /* _WIN32 */
Process::Ptr process = new Process(Process::PrepareCommand(new Array(std::move(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()
{
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()
{
m_RequestRestart = true;
}
/**
* Signals the application to reopen log files during the
* next execution of the event loop.
*/
void Application::RequestReopenLogs()
{
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))) {
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) {
std::vector<String> paths = String(pathEnv).Split(":");
bool foundPath = false;
for (const 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)) {
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(nullptr, FullExePath, sizeof(FullExePath)))
BOOST_THROW_EXCEPTION(win32_error()
<< boost::errinfo_api_function("GetModuleFileName")
<< errinfo_win32_error(GetLastError()));
return FullExePath;
#endif /* _WIN32 */
}
/**
* Display version and path information.
*/
void Application::DisplayInfoMessage(std::ostream& os, bool skipVersion)
{
/* icinga-app prints its own version information, stack traces need it here. */
if (!skipVersion)
os << " Application version: " << GetAppVersion() << "\n\n";
os << "System information:\n"
<< " Platform: " << Utility::GetPlatformName() << "\n"
<< " Platform version: " << Utility::GetPlatformVersion() << "\n"
<< " Kernel: " << Utility::GetPlatformKernel() << "\n"
<< " Kernel version: " << Utility::GetPlatformKernelVersion() << "\n"
<< " Architecture: " << Utility::GetPlatformArchitecture() << "\n";
os << "\nBuild information:\n"
<< " Compiler: " << ScriptGlobal::Get("BuildCompilerName") << " " << ScriptGlobal::Get("BuildCompilerVersion") << "\n"
<< " Build host: " << ScriptGlobal::Get("BuildHostName") << "\n";
os << "\nApplication information:\n"
<< "\nGeneral paths:\n"
<< " Config directory: " << GetConst("ConfigDir") << "\n"
<< " Data directory: " << GetConst("DataDir") << "\n"
<< " Log directory: " << GetConst("LogDir") << "\n"
<< " Cache directory: " << GetConst("CacheDir") << "\n"
<< " Spool directory: " << GetConst("SpoolDir") << "\n"
<< " Run directory: " << GetConst("InitRunDir") << "\n"
<< "\nOld paths (deprecated):\n"
<< " Installation root: " << GetConst("PrefixDir") << "\n"
<< " Sysconf directory: " << GetConst("SysconfDir") << "\n"
<< " Run directory (base): " << GetConst("RunDir") << "\n"
<< " Local state directory: " << GetConst("LocalStateDir") << "\n"
<< "\nInternal paths:\n"
<< " Package data directory: " << GetConst("PkgDataDir") << "\n"
<< " State path: " << GetConst("StatePath") << "\n"
<< " Modified attributes path: " << GetConst("ModAttrPath") << "\n"
<< " Objects path: " << GetConst("ObjectsPath") << "\n"
<< " Vars path: " << GetConst("VarsPath") << "\n"
<< " PID path: " << GetConst("PidPath") << "\n";
}
/**
* 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://github.com/Icinga/icinga2 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()
{
return GetConst("LogDir") + "/crash/report." + Convert::ToString(Utility::GetTime());
}
void Application::AttachDebugger(const String& filename, bool interactive)
{
#ifndef _WIN32
#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) {
if (!interactive) {
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 **argv;
char *my_pid_str = strdup(my_pid.CStr());
if (interactive) {
const char *uargv[] = {
"gdb",
"-p",
my_pid_str,
nullptr
};
argv = const_cast<char **>(uargv);
(void) execvp(argv[0], argv);
} else {
const char *uargv[] = {
"gdb",
"--batch",
"-p",
my_pid_str,
"-ex",
"thread apply all bt full",
"-ex",
"detach",
"-ex",
"quit",
nullptr
};
argv = const_cast<char **>(uargv);
(void) execvp(argv[0], 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 __ */
#else /* _WIN32 */
DebugBreak();
#endif /* _WIN32 */
}
#ifndef _WIN32
/**
* 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, nullptr);
Application::Ptr instance = Application::GetInstance();
if (!instance)
return;
instance->RequestShutdown();
}
#endif /* _WIN32 */
/**
* 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 SIGUSR2. Hands over PID to child and commits suicide
*
* @param - The signal number.
*/
void Application::SigUsr2Handler(int)
{
Log(LogInformation, "Application", "Reload requested, letting new process take over.");
#ifdef HAVE_SYSTEMD
sd_notifyf(0, "MAINPID=%lu", (unsigned long) m_ReloadProcess);
#endif /* HAVE_SYSTEMD */
/* Write the PID of the new process to the pidfile before this
* process exits to keep systemd happy.
*/
Application::Ptr instance = GetInstance();
try {
instance->UpdatePidFile(GetConst("PidPath"), m_ReloadProcess);
} catch (const std::exception&) {
/* abort restart */
Log(LogCritical, "Application", "Cannot update PID file. Aborting restart operation.");
return;
}
instance->ClosePidFile(false);
Exit(0);
}
/**
* 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, nullptr);
#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();
String dirName = Utility::DirName(fname);
if (!Utility::PathExists(dirName)) {
#ifndef _WIN32
if (mkdir(dirName.CStr(), 0700) < 0 && errno != EEXIST) {
#else /*_ WIN32 */
if (mkdir(dirName.CStr()) < 0 && errno != EEXIST) {
#endif /* _WIN32 */
std::cerr << "Could not create directory '" << dirName << "': Error " << errno << ", " << strerror(errno) << "\n";
}
}
bool interactive_debugger = Convert::ToBool(ScriptGlobal::Get("AttachDebugger"));
if (!interactive_debugger) {
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);
ofs << "\n";
ofs.close();
} else {
Log(LogCritical, "Application", "Icinga 2 has terminated unexpectedly. Attaching debugger...");
}
AttachDebugger(fname, interactive_debugger);
}
#ifdef _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(nullptr, FALSE);
return TRUE;
}
bool Application::IsProcessElevated() {
BOOL fIsElevated = FALSE;
DWORD dwError = ERROR_SUCCESS;
HANDLE hToken = nullptr;
if (!OpenProcessToken(GetCurrentProcess(), TOKEN_QUERY, &hToken))
dwError = GetLastError();
else {
TOKEN_ELEVATION elevation;
DWORD dwSize;
if (!GetTokenInformation(hToken, TokenElevation, &elevation, sizeof(elevation), &dwSize))
dwError = GetLastError();
else
fIsElevated = elevation.TokenIsElevated;
}
if (hToken) {
CloseHandle(hToken);
hToken = nullptr;
}
if (ERROR_SUCCESS != dwError) {
LPSTR mBuf = nullptr;
if (!FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
nullptr, dwError, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), mBuf, 0, nullptr))
BOOST_THROW_EXCEPTION(std::runtime_error("Failed to format error message, last error was: " + dwError));
else
BOOST_THROW_EXCEPTION(std::runtime_error(mBuf));
}
return fIsElevated;
}
#endif /* _WIN32 */
/**
* Handler for unhandled exceptions.
*/
void Application::ExceptionHandler()
{
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, nullptr);
#endif /* _WIN32 */
String fname = GetCrashReportFilename();
String dirName = Utility::DirName(fname);
if (!Utility::PathExists(dirName)) {
#ifndef _WIN32
if (mkdir(dirName.CStr(), 0700) < 0 && errno != EEXIST) {
#else /*_ WIN32 */
if (mkdir(dirName.CStr()) < 0 && errno != EEXIST) {
#endif /* _WIN32 */
std::cerr << "Could not create directory '" << dirName << "': Error " << errno << ", " << strerror(errno) << "\n";
}
}
bool interactive_debugger = Convert::ToBool(ScriptGlobal::Get("AttachDebugger"));
if (!interactive_debugger) {
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();
}
AttachDebugger(fname, interactive_debugger);
abort();
}
#ifdef _WIN32
LONG CALLBACK Application::SEHUnhandledExceptionFilter(PEXCEPTION_POINTERS exi)
{
if (l_InExceptionHandler)
return EXCEPTION_CONTINUE_SEARCH;
l_InExceptionHandler = true;
String fname = GetCrashReportFilename();
String dirName = Utility::DirName(fname);
if (!Utility::PathExists(dirName)) {
#ifndef _WIN32
if (mkdir(dirName.CStr(), 0700) < 0 && errno != EEXIST) {
#else /*_ WIN32 */
if (mkdir(dirName.CStr()) < 0 && errno != EEXIST) {
#endif /* _WIN32 */
std::cerr << "Could not create directory '" << dirName << "': Error " << errno << ", " << strerror(errno) << "\n";
}
}
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()
{
std::set_terminate(&Application::ExceptionHandler);
#ifndef _WIN32
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
sa.sa_handler = &Application::SigAbrtHandler;
sigaction(SIGABRT, &sa, nullptr);
#else /* _WIN32 */
SetUnhandledExceptionFilter(&Application::SEHUnhandledExceptionFilter);
#endif /* _WIN32 */
}
/**
* Runs the application.
*
* @returns The application's exit code.
*/
int Application::Run()
{
#ifndef _WIN32
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
sa.sa_handler = &Application::SigIntTermHandler;
sigaction(SIGINT, &sa, nullptr);
sigaction(SIGTERM, &sa, nullptr);
sa.sa_handler = &Application::SigUsr1Handler;
sigaction(SIGUSR1, &sa, nullptr);
sa.sa_handler = &Application::SigUsr2Handler;
sigaction(SIGUSR2, &sa, nullptr);
#else /* _WIN32 */
SetConsoleCtrlHandler(&Application::CtrlHandler, TRUE);
#endif /* _WIN32 */
try {
UpdatePidFile(GetConst("PidPath"));
} catch (const std::exception&) {
Log(LogCritical, "Application")
<< "Cannot update PID file '" << GetConst("PidPath") << "'. Aborting.";
return EXIT_FAILURE;
}
SetMainTime(Utility::GetTime());
return Main();
}
void Application::UpdatePidFile(const String& filename)
{
UpdatePidFile(filename, Utility::GetPid());
}
/**
* 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)
{
ObjectLock olock(this);
if (m_PidFile)
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)
m_PidFile = fopen(filename.CStr(), "w");
if (!m_PidFile) {
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)
{
ObjectLock olock(this);
if (m_PidFile) {
if (unlink) {
String pidpath = GetConst("PidPath");
::unlink(pidpath.CStr());
}
fclose(m_PidFile);
}
m_PidFile = nullptr;
}
/**
* 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)
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;
}
/**
* Declares a const with ScriptGlobal
*
* @param name The const name.
* @param value The new value.
*/
void Application::DeclareConst(const String& name, const Value& value)
{
if (!ScriptGlobal::Exists(name))
ScriptGlobal::Set(name, value);
}
/**
* Returns the value of a const from ScriptGlobal
*
* @param name The const name.
*/
Value Application::GetConst(const String& name)
{
return GetConst(name, Empty);
}
/**
* Returns the value of a const from ScriptGlobal with default value
*
* @param name The const name.
* @param def The default value.
*/
Value Application::GetConst(const String& name, Value defaultValue)
{
return ScriptGlobal::Get(name, &defaultValue);
}
int Application::GetDefaultRLimitFiles()
{
return 16 * 1024;
}
int Application::GetDefaultRLimitProcesses()
{
return 16 * 1024;
}
int Application::GetDefaultRLimitStack()
{
return 256 * 1024;
}
/**
* Retrieves the concurrency level.
*
* @returns The concurrency level.
*/
int Application::GetConcurrency()
{
Value defaultConcurrency = std::thread::hardware_concurrency();
return ScriptGlobal::Get("Concurrency", &defaultConcurrency);
}
/**
* Sets the max concurrent checks.
*
* @param maxChecks The new limit.
*/
void Application::SetMaxConcurrentChecks(int maxChecks)
{
ScriptGlobal::Set("MaxConcurrentChecks", maxChecks);
}
/**
* Retrieves the max concurrent checks.
*
* @returns The max number of concurrent checks.
*/
int Application::GetMaxConcurrentChecks()
{
Value defaultMaxConcurrentChecks = GetDefaultMaxConcurrentChecks();
return ScriptGlobal::Get("MaxConcurrentChecks", &defaultMaxConcurrentChecks);
}
/**
* Retrieves the default value for max concurrent checks.
*
* @returns The default max number of concurrent checks.
*/
int Application::GetDefaultMaxConcurrentChecks()
{
return 512;
}
/**
* Returns the global thread pool.
*
* @returns The global thread pool.
*/
ThreadPool& Application::GetTP()
{
static ThreadPool tp;
return tp;
}
double Application::GetStartTime()
{
return m_StartTime;
}
void Application::SetStartTime(double ts)
{
m_StartTime = ts;
}
double Application::GetMainTime()
{
return m_MainTime;
}
void Application::SetMainTime(double ts)
{
m_MainTime = ts;
}
bool Application::GetScriptDebuggerEnabled()
{
return m_ScriptDebuggerEnabled;
}
void Application::SetScriptDebuggerEnabled(bool enabled)
{
m_ScriptDebuggerEnabled = enabled;
}
double Application::GetLastReloadFailed()
{
return m_LastReloadFailed;
}
void Application::SetLastReloadFailed(double ts)
{
m_LastReloadFailed = ts;
}
void Application::ValidateName(const Lazy<String>& lvalue, const ValidationUtils& utils)
{
ObjectImpl<Application>::ValidateName(lvalue, utils);
if (lvalue() != "app")
BOOST_THROW_EXCEPTION(ValidationError(this, { "name" }, "Application object must be named 'app'."));
}
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