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construct/construct/construct.cc

367 lines
8.3 KiB
C++

// Matrix Construct
//
// Copyright (C) Matrix Construct Developers, Authors & Contributors
// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice is present in all copies. The
// full license for this software is available in the LICENSE file.
#include <ircd/ircd.h>
#include <ircd/asio.h>
#include <RB_INC_SYS_RESOURCE_H
#include "lgetopt.h"
#include "construct.h"
namespace fs = ircd::fs;
static void sigfd_handler(const boost::system::error_code &, int) noexcept;
static bool startup_checks();
static void enable_coredumps();
static void print_version();
const char *const fatalerrstr
{R"(
***
*** A fatal error has occurred. Please contact the developer with the message below.
*** Create a coredump by reproducing the error using the -debug command-line option.
***
%s
)"};
const char *const usererrstr
{R"(
***
*** A fatal startup error has occurred. Please fix the problem to continue. ***
***
%s
)"};
bool printversion;
bool cmdline;
const char *configfile;
const char *execute;
lgetopt opts[] =
{
{ "help", nullptr, lgetopt::USAGE, "Print this text" },
{ "version", &printversion, lgetopt::BOOL, "Print version and exit" },
{ "configfile", &configfile, lgetopt::STRING, "File to use for ircd.conf" },
{ "debug", &ircd::debugmode, lgetopt::BOOL, "Enable options for debugging" },
{ "console", &cmdline, lgetopt::BOOL, "Drop to a command line immediately after startup" },
{ "execute", &execute, lgetopt::STRING, "Execute command lines immediately after startup" },
{ "nolisten", &ircd::nolisten, lgetopt::BOOL, "Normal execution but without listening sockets" },
{ "noautomod", &ircd::noautomod, lgetopt::BOOL, "Normal execution but without autoloading modules" },
{ "checkdb", &ircd::checkdb, lgetopt::BOOL, "Perform complete checks of databases when opening" },
{ "pitrecdb", &ircd::pitrecdb, lgetopt::BOOL, "Allow Point-In-Time-Recover if DB reports corruption after crash" },
{ "nojs", &ircd::nojs, lgetopt::BOOL, "Disable SpiderMonkey JS subsystem from initializing. (noop when not available)." },
{ nullptr, nullptr, lgetopt::STRING, nullptr },
};
std::unique_ptr<boost::asio::io_context> ios
{
// Having trouble with static dtor in clang so this has tp be dynamic
std::make_unique<boost::asio::io_context>()
};
boost::asio::signal_set sigs
{
*ios
};
int main(int argc, char *const *argv)
try
{
umask(077); // better safe than sorry --SRB
parseargs(&argc, &argv, opts);
if(!startup_checks())
return 1;
// cores are not dumped without consent of the user to maintain the privacy
// of cryptographic key material in memory at the time of the crash.
if(RB_DEBUG_LEVEL || ircd::debugmode)
enable_coredumps();
if(printversion)
{
print_version();
return 0;
}
// Determine the configuration file from either the user's command line
// argument or fall back to the default.
const std::string confpath
{
configfile?: ""
};
// Associates libircd with our io_context and posts the initial routines
// to that io_context. Execution of IRCd will then occur during ios::run()
ircd::init(*ios, confpath);
// libircd does no signal handling (or at least none that you ever have to
// care about); reaction to all signals happens out here instead. Handling
// is done properly through the io_context which registers the handler for
// the platform and then safely posts the received signal to the io_context
// event loop. This means we lose the true instant hardware-interrupt gratitude
// of signals but with the benefit of unconditional safety and cross-
// platformness with windows etc.
sigs.add(SIGHUP);
sigs.add(SIGINT);
sigs.add(SIGQUIT);
sigs.add(SIGTERM);
sigs.add(SIGUSR1);
sigs.async_wait(sigfd_handler);
// Because we registered signal handlers with the io_context, ios->run()
// is now shared between those handlers and libircd. This means the run()
// won't return even if we call ircd::quit(). We use the callback to then
// cancel the handlers so run() can return and the program can exit.
const ircd::runlevel_changed handler{[]
(const auto &runlevel)
{
switch(runlevel)
{
case ircd::runlevel::HALT:
case ircd::runlevel::FAULT:
sigs.cancel();
break;
default:
break;
}
}};
// If the user wants to immediately drop to a command line without having to
// send a ctrl-c for it, that is provided here.
if(cmdline)
console_spawn();
if(execute)
console_execute({execute});
// Execution.
// Blocks until a clean exit from a quit() or an exception comes out of it.
ios->run();
}
catch(const ircd::user_error &e)
{
if(ircd::debugmode)
throw;
fprintf(stderr, usererrstr, e.what());
return EXIT_FAILURE;
}
catch(const std::exception &e)
{
if(ircd::debugmode)
throw;
/*
* Why EXIT_FAILURE here?
* Because if ircd_die_cb() is called it's because of a fatal
* error inside libcharybdis, and we don't know how to handle the
* exception, so it is logical to return a FAILURE exit code here.
* --nenolod
*
* left the comment but the code is gone -jzk
*/
fprintf(stderr, fatalerrstr, e.what());
return EXIT_FAILURE;
}
void
print_version()
{
printf("VERSION :%s\n",
RB_VERSION);
#ifdef CUSTOM_BRANDING
printf("VERSION :based on %s-%s\n",
PACKAGE_NAME,
PACKAGE_VERSION);
#endif
}
bool
startup_checks()
try
{
#ifndef _WIN32
if(geteuid() == 0)
throw ircd::error("Don't run ircd as root!!!");
#endif
fs::chdir(fs::get(fs::PREFIX));
return true;
}
catch(const std::exception &e)
{
fprintf(stderr, usererrstr, e.what());
return false;
}
void
#ifdef HAVE_SYS_RESOURCE_H
enable_coredumps()
try
{
//
// Setup corefile size immediately after boot -kre
//
rlimit rlim; // resource limits
ircd::syscall(getrlimit, RLIMIT_CORE, &rlim);
// Set corefilesize to maximum
rlim.rlim_cur = rlim.rlim_max;
ircd::syscall(setrlimit, RLIMIT_CORE, &rlim);
}
catch(const std::exception &e)
{
std::cerr << "Failed to adjust rlimit: " << e.what() << std::endl;
}
#else
enable_coredumps()
{
}
#endif
static void handle_quit();
static void handle_interruption();
static void handle_hangup();
static void handle_usr1();
static void handle(const int &signum);
void
sigfd_handler(const boost::system::error_code &ec,
int signum)
noexcept
{
switch(ec.value())
{
using namespace boost::system::errc;
case success:
break;
case operation_canceled:
console_cancel();
return;
default:
console_cancel();
throw std::runtime_error(ec.message());
}
handle(signum);
switch(ircd::runlevel)
{
case ircd::runlevel::QUIT:
case ircd::runlevel::FAULT:
return;
default:
sigs.async_wait(sigfd_handler);
}
}
void
handle(const int &signum)
{
switch(signum)
{
case SIGINT: return handle_interruption();
case SIGHUP: return handle_hangup();
case SIGQUIT: return handle_quit();
case SIGTERM: return handle_quit();
case SIGUSR1: return handle_usr1();
}
}
void
handle_quit()
try
{
console_cancel();
ircd::quit();
}
catch(const std::exception &e)
{
ircd::log::error
{
"SIGQUIT handler: %s", e.what()
};
}
void
handle_hangup()
try
{
console_hangup();
}
catch(const std::exception &e)
{
ircd::log::error
{
"SIGHUP handler: %s", e.what()
};
}
void
handle_interruption()
try
{
if(console_active)
console_cancel();
else
console_spawn();
}
catch(const std::exception &e)
{
ircd::log::error
{
"SIGINT handler: %s", e.what()
};
}
void
handle_usr1()
try
{
// Spawning the context that follows this branch and doing a rehash
// when not in a stable state like runlevel::RUN will just make a mess
// so any signal received is just dropped and the user can try again.
if(ircd::runlevel != ircd::runlevel::RUN)
{
ircd::log::warning
{
"Not rehashing conf from SIGUSR1 in runlevel %s",
reflect(ircd::runlevel)
};
return;
}
// This signal handler (though not a *real* signal handler) is still
// running on the main async stack and not an ircd::ctx. The rehash
// function does a lot of IO so it requires an ircd::ctx.
ircd::context{[]
{
ircd::m::import<void ()> rehash_conf
{
"s_conf", "rehash_conf"
};
rehash_conf();
}};
}
catch(const std::exception &e)
{
ircd::log::error
{
"SIGUSR1 handler: %s", e.what()
};
}