1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
|
#!@PERL@ -w
# Perl version of check_dns plugin which calls DNS directly instead of
# relying on nslookup (which has bugs)
#
# Copyright 2000, virCIO, LLP
#
# Revision 1.3 2002/05/07 05:35:49 sghosh
# 2nd fix for ePN
#
# Revision 1.2 2002/05/02 16:43:29 sghosh
# fix for embedded perl
#
# Revision 1.1.1.1 2002/02/28 06:43:00 egalstad
# Initial import of existing plugin code
#
# Revision 1.1 2000/08/03 20:41:12 karldebisschop
# rename to avoid conflict when installing
#
# Revision 1.1 2000/08/03 19:27:08 karldebisschop
# use Net::DNS to check name server
#
# Revision 1.1 2000/07/20 19:09:13 cwg
# All the pieces needed to use my version of check_dns.
#
#
use Getopt::Long;
use Net::DNS;
use FindBin;
use lib "$FindBin::Bin";
use utils;
my $PROGNAME = "check_netdns";
$ENV{'PATH'}='@TRUSTED_PATH@';
$ENV{'BASH_ENV'}='';
$ENV{'ENV'}='';
Getopt::Long::Configure(`bundling`);
GetOptions("V" => $opt_V, "version" => $opt_V,
"h" => $opt_h, "help" => $opt_h,
"t=i" => $opt_t, "timeout=i" => $opt_t,
"s=s" => $opt_s, "server=s" => $opt_s,
"H=s" => $opt_H, "hostname=s" => $opt_H);
# -h means display verbose help screen
if($opt_h){ print_help(); exit 0; }
# -V means display version number
if ($opt_V) { print_version(); exit 0; }
# -H means host name
$opt_H = shift unless ($opt_H);
unless ($opt_H) { print_usage(); exit -1; }
if ($opt_H &&
$opt_H =~ m/^([0-9]+.[0-9]+.[0-9]+.[0-9]+|[a-zA-Z][-a-zA-Z0]+(.[a-zA-Z][-a-zA-Z0]+)*)$/)
{
$host = $1;
} else {
print "$opt_H is not a valid host name";
exit -1;
}
# -s means server name
$opt_s = shift unless ($opt_s);
if ($opt_s) {
if ($opt_s =~ m/^([0-9]+.[0-9]+.[0-9]+.[0-9]+|[a-zA-Z][-a-zA-Z0]+(.[a-zA-Z][-a-zA-Z0]+)*)$/)
{
$server = $1;
} else {
print "$opt_s is not a valid host name";
exit -1;
}
}
# -t means timeout
my $timeout = 10 unless ($opt_t);
my $res = new Net::DNS::Resolver;
#$res->debug(1);
if ($server) {
$res->nameservers($server);
}
$res->tcp_timeout($timeout);
$SIG{ALRM} = &catch_alarm;
alarm($timeout);
$query = $res->query($host);
if ($query) {
my @answer = $query->answer;
if (@answer) {
print join(`/`, map {
$_->type . ` ` . $_->rdatastr;
} @answer);
exit 0;
} else {
print "empty answer";
exit 2;
}
}
else {
print "query failed: ", $res->errorstring, "";
exit 2;
}
sub catch_alarm {
print "query timed out";
exit 2;
}
sub print_version () {
my $arg0 = $0;
chomp $arg0;
print "$arg0 version 0.1";
}
sub print_help() {
print_version();
print "";
print "Check if a nameserver can resolve a given hostname.";
print "";
print_usage();
print "";
print "-H, --hostname=HOST";
print " The name or address you want to query";
print "-s, --server=HOST";
print " Optional DNS server you want to use for the lookup";
print "-t, --timeout=INTEGER";
print " Seconds before connection times out (default: 10)";
print "-h, --help";
print " Print detailed help";
print "-V, --version";
print " Print version numbers and license information";
}
sub print_usage () {
my $arg0 = $0;
chomp $arg0;
print "$arg0 check_dns -H host [-s server] [-t timeout]";
print "$arg0 [-h | --help]";
print "$arg0 [-V | --version]";
}
|
