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|
#!/usr/bin/perl -w
# ##############################################################################
# a simple IRC bot which dispatches messages received via local domain sockets
# ##############################################################################
use strict;
use File::Basename;
BEGIN {
unshift @INC, dirname($0);
}
my $VERSION = '0.2';
my $running = 1;
# Read a configuration file
# The arg can be a relative or full path, or
# it can be a file located somewhere in @INC.
sub ReadCfg
{
my $file = $_[0];
our $err;
{ # Put config data into a separate namespace
package CFG;
# Process the contents of the config file
my $rc = do($file);
# Check for errors
if ($@) {
$::err = "ERROR: Failure compiling '$file' - $@";
} elsif (! defined($rc)) {
$::err = "ERROR: Failure reading '$file' - $!";
} elsif (! $rc) {
$::err = "ERROR: Failure processing '$file'";
}
}
return ($err);
}
# Get our configuration information
if (my $err = ReadCfg('/etc/nagios_nsa.cfg')) {
print(STDERR $err, "\n");
exit(1);
}
use POSIX qw(setsid);
use IO::Socket;
use Net::IRC;
sub new {
my $self = {
socket => undef,
irc => undef,
conn => undef
};
return bless($self, __PACKAGE__);
}
sub daemonize {
my $self = shift;
my $pid;
chdir '/' or die "Can't chdir to /: $!";
open STDIN, '/dev/null' or die "Can't read /dev/null: $!";
open STDOUT, '>/dev/null' or die "Can't write to /dev/null: $!";
defined ($pid = fork) or die "Can't fork: $!";
if ($pid && $CFG::Nsa{'pidfile'}) { # write pid of child
open PID, ">$CFG::Nsa{'pidfile'}" or die "Can't open pid file: $!";
print PID $pid;
close PID;
}
exit if $pid;
setsid or die "Can't start a new session: $!";
#open STDERR, '>&STDOUT' or die "Can't dup stdout: $!";
}
sub run {
my $self = shift;
$self->{irc}->do_one_loop();
}
sub shutdown {
my $sig = shift;
print STDERR "Received SIG$sig, shutting down...\n";
$running = 0;
}
sub socket_has_data {
my $self = shift;
$self->{socket}->recv(my $data, 1024);
$self->{conn}->privmsg($CFG::Nsa{'channel'}, $data);
}
sub irc_on_connect {
my $self = shift;
print STDERR "Joining channel '$CFG::Nsa{'channel'}'...\n";
$self->join($CFG::Nsa{'channel'});
}
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
my $bot = &new;
if (-e $CFG::Nsa{'socket'}) {
die "Socket '$CFG::Nsa{'socket'}' exists!\n";
}
$bot->{socket} = IO::Socket::UNIX->new (
Local => $CFG::Nsa{'socket'},
Type => SOCK_DGRAM,
Listen => 5
) || die "Can't create socket '$CFG::Nsa{'socket'}'!\n";
$SIG{INT} = $SIG{TERM} = \&shutdown;
$bot->daemonize();
$bot->{irc} = new Net::IRC;
$bot->{conn} = $bot->{irc}->newconn (
Server => $CFG::Nsa{'server'},
Port => $CFG::Nsa{'port'},
Nick => $CFG::Nsa{'nickname'},
Username => $CFG::Nsa{'nickname'},
Password => $CFG::Nsa{'password'},
Ircname => $CFG::Nsa{'realname'} . " (NSA $VERSION)",
) || die "Can't connect to server '$CFG::Nsa{'server'}'!\n";
$bot->{conn}->add_global_handler(376, \&irc_on_connect);
$bot->{conn}->add_global_handler('nomotd', \&irc_on_connect);
$bot->{irc}->addfh($bot->{socket}, \&socket_has_data, 'r', $bot);
while ($running) {
$bot->run();
}
close($bot->{socket});
unlink($CFG::Nsa{'socket'});
exit(0);
1;
__END__
|
