%mode 0750
#!/usr/bin/env perl
#
# InspIRCd -- Internet Relay Chat Daemon
#
#   Copyright (C) 2015 Steven Van Acker <steven@singularity.be>
#   Copyright (C) 2015 Attila Molnar <attilamolnar@hush.com>
#   Copyright (C) 2014 Dan Parsons <dparsons@nyip.net>
#   Copyright (C) 2013-2014, 2016-2021 Sadie Powell <sadie@witchery.services>
#   Copyright (C) 2012 Robby <robby@chatbelgie.be>
#   Copyright (C) 2011 DjSlash <djslash@djslash.org>
#   Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
#   Copyright (C) 2008-2009 Robin Burchell <robin+git@viroteck.net>
#   Copyright (C) 2008 Thomas Stagner <aquanight@inspircd.org>
#   Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
#   Copyright (C) 2006 Oliver Lupton <om@inspircd.org>
#   Copyright (C) 2006 John Brooks <special@inspircd.org>
#   Copyright (C) 2005-2006, 2008-2009 Craig Edwards <brain@inspircd.org>
#   Copyright (C) 2005 Craig McLure <craig@frostycoolslug.com>
#
# This file is part of InspIRCd.  InspIRCd 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, version 2.
#
# 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, see <http://www.gnu.org/licenses/>.
#

# InspIRCd          Start up the InspIRCd Internet Relay Chat Daemon
#
# chkconfig: 2345 55 25
# description: InspIRCd -- Internet Relay Chat Daemon
#
# processname: inspircd

use strict;
use POSIX;
use Fcntl;

# From http://refspecs.linuxbase.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/iniscrptact.html
use constant {
    STATUS_EXIT_SUCCESS => 0,
    STATUS_EXIT_DEAD_WITH_PIDFILE => 1,
    STATUS_EXIT_DEAD_WITH_LOCKFILE => 2,
    STATUS_EXIT_NOT_RUNNING => 3,
    STATUS_EXIT_UNKNOWN => 4,

    GENERIC_EXIT_SUCCESS => 0,
    GENERIC_EXIT_UNSPECIFIED => 1,
    GENERIC_EXIT_INVALID_ARGUMENTS => 2,
    GENERIC_EXIT_UNIMPLEMENTED => 3,
    GENERIC_EXIT_INSUFFICIENT_PRIVILEGE => 4,
    GENERIC_EXIT_NOT_INSTALLED => 5,
    GENERIC_EXIT_NOT_CONFIGURED => 6,
    GENERIC_EXIT_NOT_RUNNING => 7
};

my $scriptpath = "@SCRIPT_DIR@";
my $confpath	=	"@CONFIG_DIR@";
my $binpath	=	"@BINARY_DIR@";
my $runtimedir = "@RUNTIME_DIR@";
my $valgrindlogpath = "@LOG_DIR@/valgrind";
my $executable	=	"inspircd";
my $version	=	"@VERSION_FULL@";
my $uid = "@UID@";

my @gdbargs = (
	'--eval-command', 'handle SIGPIPE pass nostop noprint',
	'--eval-command', 'handle SIGHUP pass nostop noprint',
	'--eval-command', 'run',
	'--args', "$binpath/$executable", qw(--nofork --nolog --debug)
);

sub expand_fragment($$) {
	my ($base, $fragment) = @_;
	if ($fragment =~ /^\//) {
		return $fragment;
	} else {
		return "$base/$fragment";
	}
}

if (!(grep { $_ eq '--runasroot' } @ARGV) && ($< == 0 || $> == 0)) {
	if ($uid !~ /^\d+$/) {
		# Named UID, look it up
		$uid = getpwnam $uid;
	}
	if (!$uid) {
		die "Cannot find a valid UID to change to";
	}
	# drop root if we were configured with an ircd UID
	$< = $uid;
	$> = $uid;
	if ($< == 0 || $> == 0) {
		die "Could not drop root: $!";
	}
}

our($pid,$pidfile);
# Lets see what they want to do.. Set the variable (Cause i'm a lazy coder)
my $arg = shift(@ARGV);
my $conf;
for my $a (@ARGV)
{
	if ($a =~ m/^--config=(.*)$/)
	{
		$conf = $1;
		last;
	}
}
if (!defined $conf) {
	$conf = expand_fragment $confpath, "inspircd.conf";
	push @ARGV, '--config='.$conf;
}

getpidfile($conf);

# System for naming script command subs:
# cmd_<name> - Normal command for use by users.
# dev_<name> - Developer commands.
# hid_<name> - Hidden commands (ie Cheese-Sandwich)
# Ideally command subs shouldn't return.

my $subname = $arg;
$subname =~ s/-/_/g;
my $sub = main->can("cmd_$subname") || main->can("dev_$subname") || main->can("hid_$subname");
if (!defined($sub))
{
	print STDERR "Invalid command or none given.\n";
	cmd_help();
	exit GENERIC_EXIT_UNIMPLEMENTED;
}
else
{
	exit $sub->(@ARGV); # Error code passed through return value
}

sub cmd_help()
{
	my @subs = grep { $_ =~ m/^(cmd|dev)_/ && defined(main->can($_)) } keys(%::);
	my @cmds = grep /^cmd_/, @subs;
	my @devs = grep /^dev_/, @subs;
	local $_;
	$_ =~ s/^(cmd|dev)_// for (@cmds, @devs);
	$_ =~ s/_/-/g for (@cmds, @devs);
	print STDERR "Usage: ./inspircd (" . join("|", @cmds) . ")\n";
	print STDERR "Developer arguments: (" . join("|", @devs) . ")\n";
	exit GENERIC_EXIT_SUCCESS;
}

sub cmd_status()
{
	if (getstatus() == 1) {
		my $pid = getprocessid();
		print "InspIRCd is running (PID: $pid)\n";
		exit STATUS_EXIT_SUCCESS;
	} else {
		print "InspIRCd is not running. (Or PID File not found)\n";
		exit STATUS_EXIT_NOT_RUNNING;
	}
}

sub cmd_rehash()
{
	if (getstatus() == 1) {
		my $pid = getprocessid();
		kill HUP => $pid;
		print "InspIRCd rehashed (pid: $pid).\n";
		exit GENERIC_EXIT_SUCCESS;
	} else {
		print "InspIRCd is not running. (Or PID File not found)\n";
		exit GENERIC_EXIT_NOT_RUNNING;
	}
}

sub cmd_cron()
{
	if (getstatus() == 0) { goto &cmd_start(@_); }
	exit GENERIC_EXIT_UNSPECIFIED;
}

sub cmd_version()
{
	print "InspIRCd version: $version\n";
	exit GENERIC_EXIT_SUCCESS;
}

sub cmd_restart(@)
{
	cmd_stop();
	unlink($pidfile) if (-e $pidfile);
	goto &cmd_start(@_);
}

sub hid_cheese_sandwich()
{
	print "Creating Cheese Sandwich..\n";
	print "Done.\n";
	exit GENERIC_EXIT_SUCCESS;
}

sub cmd_start(@)
{
	# Check to see its not 'running' already.
	if (getstatus() == 1) { print "InspIRCd is already running.\n"; exit GENERIC_EXIT_SUCCESS; }

	# If we are still alive here.. Try starting the IRCd..
	print "$binpath/$executable doesn't exist\n" and return 0 unless(-e "$binpath/$executable");
	print "$binpath/$executable is not executable\n" and return 0 unless(-f "$binpath/$executable" && -x "$binpath/$executable");

	exec "$binpath/$executable", @_;
	die "Failed to start IRCd: $!\n";
}

sub dev_debug(@)
{
	# Check to see its not 'running' already.
	if (getstatus() == 1) { print "InspIRCd is already running.\n"; return 0; }

	print "$binpath/$executable doesn't exist\n" and return 0 unless(-e "$binpath/$executable");
	print "$binpath/$executable is not executable\n" and return 0 unless(-f "$binpath/$executable" && -x "$binpath/$executable");

	# Check we have gdb
	checkgdb();

	# If we are still alive here.. Try starting the IRCd..
	exec 'gdb', @gdbargs, @_;
	die "Failed to start GDB: $!\n";
}

sub dev_screendebug(@)
{
	# Check to see its not 'running' already.
	if (getstatus() == 1) { print "InspIRCd is already running.\n"; return 0; }

	print "$binpath/$executable doesn't exist\n" and return 0 unless(-e "$binpath/$executable");

	#Check we have gdb
	checkgdb();
	checkscreen();

	# If we are still alive here.. Try starting the IRCd..
	print "Starting InspIRCd in `screen`, type `screen -r` when the ircd crashes to view the gdb output and get a backtrace.\n";
	print "Once you're inside the screen session press ^C + d to re-detach from the session\n";
	exec qw(screen -m -d gdb), @gdbargs, @_;
	die "Failed to start screen: $!\n";
}

sub dev_valdebug(@)
{
	# Check to see its not 'running' already.
	if (getstatus() == 1) { print "InspIRCd is already running.\n"; return 0; }

	print "$binpath/$executable doesn't exist\n" and return 0 unless(-e "$binpath/$executable");
	print "$binpath/$executable is not executable\n" and return 0 unless(-f "$binpath/$executable" && -x "$binpath/$executable");

	# Check we have valgrind and gdb
	checkvalgrind();
	checkgdb();

	# If we are still alive here.. Try starting the IRCd..
	# May want to do something with these args at some point: --suppressions=.inspircd.sup --gen-suppressions=yes
	# Could be useful when we want to stop it complaining about things we're sure aren't issues.
	exec qw(valgrind -v --tool=memcheck --leak-check=yes --db-attach=yes --num-callers=30), "$binpath/$executable", qw(--nofork --debug --nolog), @_;
	die "Failed to start valgrind: $!\n";
}

sub dev_valdebug_unattended(@)
{
	# NOTE: To make sure valgrind generates coredumps, set soft core limit in /etc/security/limits.conf to unlimited
	# Check to see its not 'running' already.
	if (getstatus() == 1) { print "InspIRCd is already running.\n"; return 0; }

	print "$binpath/$executable doesn't exist\n" and return 0 unless(-e "$binpath/$executable");
	print "$binpath/$executable is not executable\n" and return 0 unless(-f "$binpath/$executable" && -x "$binpath/$executable");

	# Check we have valgrind and gdb
	checkvalgrind();
	checkgdb();

	# If we are still alive here.. Try starting the IRCd..
	#
	# NOTE: Saving the debug log (redirected stdout), while useful, is a potential security risk AND one hell of a spacehog. DO NOT SAVE THIS WHERE EVERYONE HAS ACCESS!
	# Redirect stdout to /dev/null if you're worried about the security.
	#
	my $pid = fork;
	if ($pid == 0) {
		POSIX::setsid();
		-d $valgrindlogpath or mkdir $valgrindlogpath or die "Cannot create $valgrindlogpath: $!\n";
		-e "$binpath/valgrind.sup" or do { open my $f, '>', "$binpath/valgrind.sup"; };
		my $suffix = strftime("%Y%m%d-%H%M%S", localtime(time)) . ".$$";
		open STDIN, '<', '/dev/null' or die "Can't redirect STDIN to /dev/null: $!\n";
		sysopen STDOUT, "$valgrindlogpath/out.$suffix", O_WRONLY | O_CREAT | O_NOCTTY | O_APPEND, 0600 or die "Can't open $valgrindlogpath/out.$suffix: $!\n";
		sysopen STDERR, "$valgrindlogpath/valdebug.$suffix", O_WRONLY | O_CREAT | O_NOCTTY | O_APPEND, 0666 or die "Can't open $valgrindlogpath/valdebug.$suffix: $!\n";
	# May want to do something with these args at some point: --suppressions=.inspircd.sup --gen-suppressions=yes
	# Could be useful when we want to stop it complaining about things we're sure aren't issues.
		exec qw(valgrind -v --tool=memcheck --leak-check=full --show-reachable=yes --num-callers=30 --track-fds=yes),
			"--suppressions=$binpath/valgrind.sup", qw(--gen-suppressions=all),
			qw(--leak-resolution=med --time-stamp=yes --log-fd=2 --),
			"$binpath/$executable", qw(--nofork --debug --nolog), @_;
		die "Can't execute valgrind: $!\n";
	}
}

sub dev_screenvaldebug(@)
{
	# Check to see its not 'running' already.
	if (getstatus() == 1) { print "InspIRCd is already running.\n"; return 0; }

	print "$binpath/$executable doesn't exist\n" and return 0 unless(-e "$binpath/$executable");
	print "$binpath/$executable is not executable\n" and return 0 unless(-f "$binpath/$executable" && -x "$binpath/$executable");

	#Check we have gdb
	checkvalgrind();
	checkgdb();
	checkscreen();

	# If we are still alive here.. Try starting the IRCd..
	print "Starting InspIRCd in `screen`, type `screen -r` when the ircd crashes to view the valgrind and gdb output and get a backtrace.\n";
	print "Once you're inside the screen session press ^C + d to re-detach from the session\n";
	exec qw(screen -m -d valgrind -v --tool=memcheck --leak-check=yes --db-attach=yes --num-callers=30), "$binpath/$executable", qw(--nofork --debug --nolog), @_;
	die "Failed to start screen: $!\n";
}

sub cmd_stop()
{
	if (getstatus() == 0) { print "InspIRCd is not running. (Or PID File not found)\n"; return GENERIC_EXIT_SUCCESS; }
	# Get to here, we have something to kill.
	my $pid = getprocessid();
	print "Stopping InspIRCd (pid: $pid)...\n";
	my $maxwait = (`ps -o command $pid 2>/dev/null` =~ /valgrind/i) ? 90 : 15;
	kill TERM => $pid or die "Cannot terminate IRCd: $!\n";
	for (1..$maxwait) {
		sleep 1;
		if (getstatus() == 0) {
			print "InspIRCd Stopped.\n";
			return GENERIC_EXIT_SUCCESS;
		}
	}
	print "InspIRCd not dying quietly -- forcing kill\n";
	kill KILL => $pid;
	return GENERIC_EXIT_SUCCESS;
}

###
# Generic Helper Functions.
###

my %filesparsed;

sub getpidfile
{
	my ($file) = @_;
	# Before we start, do we have a PID already? (Should never occur)
	if ($pid ne "") {
		return;
	}

	# Expand any relative paths.
	$file = expand_fragment $confpath, $file;

	# Have we checked this file before?
	return if $filesparsed{$file};
	$filesparsed{$file} = 1;

	# Open the File..
	open INFILE, '<', $file or return;
	# Grab entire file contents..
	my(@lines) = <INFILE>;
	# Close the file
	close INFILE;

	# remove trailing spaces
	chomp(@lines);
	for my $i (@lines) {
		# clean it up
		$i =~ s/[^=]+=\s(.*)/\1/;
		# Does this file have a pid?
		if (($i =~ /<pid file=\"(\S+)\">/i) && ($i !~ /^#/))
		{
			# Set the PID file and return.
			$pidfile = expand_fragment $runtimedir, $1;
			return;
		}
	}


	# If we get here, NO PID FILE! -- Check for includes
	for my $i (@lines) {
		$i =~ s/[^=]+=\s(.*)/\1/;
		if (($i =~ s/\<include file=\"(.+?)\"\>//i) && ($i !~ /^#/))
		{
			# Decend into that file, and check for PIDs.. (that sounds like an STD ;/)
			getpidfile($1);
			# Was a PID found?
			if ($pidfile ne "") {
				# Yes, Return.
				return;
			}
		}
	}

	# End of includes / No includes found. Using default.
	$pidfile = $runtimedir . "/inspircd.pid";
}

sub getstatus {
	my $pid = getprocessid();
	return 0 if $pid == 0;
	return kill 0, $pid;
}


sub getprocessid {
	my $pid = 0;
	open PIDFILE, '<', $pidfile or return 0;
	while(<PIDFILE>)
	{
		/^(\d+)$/ and $pid = $1;
	}
	close PIDFILE;
	return $pid;
}

sub checkvalgrind
{
	unless(`valgrind --version`)
	{
		print "Couldn't start valgrind: $!\n";
		exit GENERIC_EXIT_UNSPECIFIED;
	}
}

sub checkgdb
{
	unless(`gdb --version`)
	{
		print "Couldn't start gdb: $!\n";
		exit GENERIC_EXIT_UNSPECIFIED;
	}
}

sub checkscreen
{
	unless(`screen --version`)
	{
		print "Couldn't start screen: $!\n";
		exit GENERIC_EXIT_UNSPECIFIED;
	}
}