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faulty module
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@andreas-marschke
andreas-marschke committed Jan 7, 2013
1 parent 27c3f50 commit 849c25e
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189 changes: 182 additions & 7 deletions lib/Nagios/NRPE/Client.pm
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Original file line number Diff line number Diff line change
Expand Up @@ -26,15 +26,190 @@ our $VERSION = '';

use 5.010_000;

use Moose;
use String::CRC32;
use Data::Dumper;
use Carp;
use IO::Socket;
use IO::Socket::INET;
use constant {
# packet version identifier
NRPE_PACKET_VERSION_3 => 3,
NRPE_PACKET_VERSION_2 => 2,
NRPE_PACKET_VERSION_1 => 1,

# id code for queries and responses to queries
QUERY_PACKET => 1,
RESPONSE_PACKET => 2,
# max amount of data we'll send in one query/response
MAX_PACKETBUFFER_LENGTH => 1024,
MAX_COMMAND_ARGUMENTS => 16,
NRPE_HELLO_COMMAND => "_NRPE_CHECK",
DEFAULT_SOCKET_TIMEOUT => 10,
DEFAULT_CONNECTION_TIMEOUT => 300,

# /* service state return codes */
STATE_UNKNOWN => 3,
STATE_CRITICAL => 2,
STATE_WARNING => 1,
STATE_OK => 0
};

sub new {
my ($class,%hash) = @_;
my $self = {};
$self->{host} = delete $hash{host} || "localhost";
$self->{port} = delete $hash{port} || 5666;
$self->{timeout} = delete $hash{timeout} || 30;
$self->{arglist} = delete $hash{arglist} || [];
$self->{check} = delete $hash{check} || "";
$self->{ssl} = delete $hash{ssl} || 5666;

bless $self,$class;

}

sub run {
my $self = shift;
my ($packet_version, # Version of NRPE
$packet_type, # Clients = QUERY = 1, Server = RESPONSE = 2
$crc32_value,
$result_code, # \x00 on querys
$buffer # buffer text consisting of the check name and its adjacent arguments max 1024 bytes
);

$packet_version = pack('n',NRPE_PACKET_VERSION_2);
$packet_type = pack('n',QUERY_PACKET);
$result_code = pack('n',2324);

$buffer = pack('a[1024]',$self->{check});

my $packet = $packet_version.$packet_type."\x00\x00\x00\x00".$result_code.$buffer."\x00\x00";

$crc32_value = ~$self->_crc32($packet);
my $packed_crc = pack ( "N", $crc32_value);

$packet = $packet_version.$packet_type.$packed_crc.$result_code.$buffer."\x00\x00";

my $socket = IO::Socket::INET->new(PeerAddr => $self->{host},
PeerPort => $self->{port},
Proto => 'tcp',
Type => SOCK_STREAM) or croak "ERROR: $@ \n";

print $socket $packet;
my $response = "";
while (<$socket>) {
$self->packet_dump($_);
}
close($socket);

}

# These functions are derived from http://www.stic-online.de/stic/html/nrpe-generic.html
# Copyright (C) 2006, 2007 STIC GmbH, http://www.stic-online.de
# Licensed under GPLv2

sub _crc32 {
my $crc;
my $len;
my $i;
my $index;
my @args;
my ($arg) = @_;
my @crc_table =(
0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419,
0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4,
0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07,
0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856,
0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4,
0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3,
0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a,
0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599,
0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190,
0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f,
0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e,
0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed,
0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3,
0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a,
0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5,
0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010,
0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17,
0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6,
0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615,
0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344,
0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a,
0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1,
0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c,
0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef,
0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe,
0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31,
0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c,
0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b,
0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1,
0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278,
0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7,
0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66,
0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605,
0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8,
0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b,
0x2d02ef8d
);

$crc = 0xffffffff;
$len = length($arg);
@args = unpack "c*", $arg;
for ($i = 0; $i < $len; $i++) {
$index = ($crc ^ $args[$i]) & 0xff;
$crc = $crc_table[$index] ^ (($crc >> 8) & 0x00ffffff);
}
return $crc;
}

sub packet_dump {
my $self = shift;
my $packet = shift;
my ($i, $k, $dump, $l, $ascii, $c);

for ( $i = 0; $i < length ( $packet ); $i+=16 ) {
$l = $i+16;
if ( $l > length ( $packet) ) {
$l = length($packet);
}
$dump = sprintf ( "%04d - %04d: ", $i, $l );
$ascii = "";
for ( $k = $i; $k < $l; $k++ ) {
$c = ( ord ( substr ( $packet, $k, 1 ) ) );
$dump .= sprintf ( "%02x ", $c );
if (( $c >= 32 ) && ( $c <= 126 )) {
$ascii .= chr ( $c );
} else {
$ascii .= ".";
}
}
for ( $k = 0; $k < ( $i + 16 - $l ); $k++ ) {
$dump .= " ";
}
print( "packet_dump() ".$dump." [".$ascii."]\n" );
}
}

has 'check' => ( is => 'rw' , isa => 'Str');
has 'host' => ( is => 'rw' , isa => 'Str');

1;




__PACKAGE__->meta->make_immutable;
no Moose;
1;
14 changes: 9 additions & 5 deletions share/nrpe-testing.pl
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Original file line number Diff line number Diff line change
Expand Up @@ -39,20 +39,19 @@

my $command = "check_users";

#Hex: 00 02 00 01
# Packet data
$packet_version = pack('n',NRPE_PACKET_VERSION_2);
$packet_type = pack('n',QUERY_PACKET);
#Hex:
$result_code = pack('n',2324);
$buffer = pack('a[1024]',$command);

my $packet = $packet_version.$packet_type."\x00\x00\x00\x00".$result_code.$buffer."\x00\x00";

$crc32_value = ~_crc32($packet);
my $packed_crc = pack ( "N", $crc32_value);

$packet = $packet_version.$packet_type.$packed_crc.$result_code.$buffer."\x00\x00";

packet_dump($packet);

my $socket = IO::Socket::INET->new(PeerAddr => '10.0.0.47',
PeerPort => '5666',
Proto => 'tcp',
Expand All @@ -61,7 +60,12 @@
print $socket $packet;

while (<$socket>) {
packet_dump($_);
my ($packet_version,$packet_type,$crc32,$result_code,$buffer) = unpack('nnNna*',$_);
print "Packet Version: $packet_version\n";
print "Packet Type: $packet_type\n";
print "CRC32 Checksum: $crc32\n";
print "Result_code: $result_code\n";
print "Buffer: $buffer\n";
}

close($socket);
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Binary file added share/nrpe_packet.png
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