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#!/usr/bin/perl
######################################################################
### Sample CGI script using the Perl 5 SNMP Module
###
### This script can be used as a CGI script with an HTTP Daemon, to
### allow asking SNMP queries from a World-Wide Web client.
###
######################################################################
### When called with an empty QUERY_STRING environment variable, a
### form is generated that lets the user fill in a host and community
### name. When the filled-in form is submitted, the script will be
### called again, this time with parameters passed through
### $QUERY_STRING. It will make an SNMP query to the selected
### host/community and return the results as an HTML document
### containing an HTML 3 table which shows the names and values of
### some MIB variable instances.
######################################################################
require 5;
use lib qw(/home/leinen/perl/SNMP_Session-0.96/lib /home/leinen/perl/SNMP_Session-0.96/blib/lib);
use SNMP_Session;
use BER;
use CGI qw(:standard start_table end_table :debug);
use strict;
sub init_oids ();
sub query_to_html_response ($$);
sub snmp_get ($@);
sub write_query_form ();
sub html_error_message ($$);
sub html_quote ($ );
my @allowed_hosts=qw(localhost ::1 127.0.0.1);
my %allowed_hosts;
my $community_file_name = "/home/leinen/snmp/.zxc";
my $ipv4_only_p = 0;
my $home_url = "http://www.switch.ch/misc/leinen/snmp/perl/";
my (%ugly_oids, %pretty_oids);
foreach (@allowed_hosts) { $allowed_hosts{$_} = 1; }
my $q = new CGI;
if (!defined ($q) || !defined $q->param ('hostname')) {
write_query_form ();
} else {
init_oids ();
if (! exists ($allowed_hosts{$q->param ('hostname')})) {
print (header ());
html_error_message ("parsing the query",
"Illegal hostname ".$q->param ('hostname'));
} else {
query_to_html_response ($q->param ('hostname'),
$q->param ('community'));
}
}
1;
sub init_oids ()
{
%ugly_oids = qw(sysDescr.0 1.3.6.1.2.1.1.1.0
sysLocation.0 1.3.6.1.2.1.1.6.0
);
foreach (keys %ugly_oids) {
$ugly_oids{$_} = encode_oid (split (/\./, $ugly_oids{$_}));
$pretty_oids{$ugly_oids{$_}} = $_;
}
}
sub query_to_html_response ($$)
{
my ($hostname, $community) = @_;
my $session;
if ($community eq 'public'
&& -r $community_file_name) {
open (COMM, $community_file_name);
$community = <COMM>;
chomp $community;
close COMM;
}
print (header (),
start_html ("Perl SNMP Module Test"),
h1 ("SNMP query to "
.html_quote ($community)
.'@'
.html_quote ($hostname)),
hr ());
srand();
eval { $session = SNMPv2c_Session->open ($hostname, $community, 161,
undef, undef, undef, undef,
$ipv4_only_p) };
html_error_message ("opening SNMP session", $SNMP_Session::errmsg), return 0
unless defined $session;
html_error_message ("opening SNMP session", $@), return 0 if $@;
eval { snmp_get ($session, qw(sysDescr.0 sysLocation.0)) };
html_error_message ("executing SNMP query", $@), return 0 if $@;
$session->close ();
print (end_html ());
1;
}
sub snmp_get ($@)
{
my($session, @oids) = @_;
my($response, $bindings, $binding, $value, $oid);
grep ($_ = $ugly_oids{$_}, @oids);
if ($session->get_request_response (@oids)) {
$response = $session->pdu_buffer;
($bindings) = $session->decode_get_response ($response);
print (start_table({border=>'1'}));
while ($bindings ne '') {
($binding,$bindings) = decode_sequence ($bindings);
($oid,$value) = decode_by_template ($binding, "%O%@");
print Tr(th ({align=>'right'},
$pretty_oids{$oid}),
td ({align=>'left'},
html_quote (pretty_print ($value))));
}
print (end_table ());
1;
} else {
die "No response received.\n";
}
}
sub write_query_form ()
{
my $first_p = 1;
my $options = join
("\n",
map ({my $res = $q->option ({-selected=>$first_p, -value=>$_}, $_);
$first_p = 0;
$res;}
@allowed_hosts));
print (header (),
start_html ("Perl SNMP Module Test"),
h1 ("Perl SNMP Module Test"),
p ("This is a sample application of an ",
a ({href => $home_url}, "SNMP Module"),
"(version ${SNMP_Session::VERSION}) for Perl 5."),
hr (),
$q->start_form (-method=>'GET'),
"Host name:\n",
Select ({name => 'hostname'},
$options), "\n",
"Community name:\n",
Select ({name => 'community'},
option ({value => 'public'},
"public")),
br (), "\n",
input ({type => 'submit',
value => "Send request"}), "\n",
input ({type => 'reset',
value => "Clear"}), "\n",
$q->end_form (),
hr (), "\n",
address (a ({href=>"http://www.switch.ch/misc/leinen/"},
"Simon Leinen <simon\@switch.ch>")), "\n",
end_html (), "\n");
}
sub html_error_message ($$)
{
my($context, $errmsg) = @_;
print ($q->h2 ("SNMP Error"), hr (),
p ("While ",$context,", the following error occurred:"),
pre (html_quote($errmsg)),
end_html ());
}
sub html_quote ($ ) {
local ($_) = @_;
return $_ unless /[<>&]/;
s/&/&/g;
s/</</g;
s/>/>/g;
$_;
}
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