Add tests using custom snmp agent

Only multi-line string test for now (regression test), counter rollover
tests planed with my snmp_counters_new branch.

NB: 64bit counters are broken in NetSNMP::agent from NetSNMP version 5.4.1
    and lower, but might come in handy one day

1 files changed, 101 insertions, 0 deletions

diff --git a/plugins/tests/check_snmp_agent.pl b/plugins/tests/check_snmp_agent.pl
new file mode 100644
index 00000000..d1ff6d00
--- /dev/null
+++ b/plugins/tests/check_snmp_agent.pl
@@ -0,0 +1,101 @@
+#! /usr/bin/perl -w -I ..
+#
+# Subagent for testing check_snmp
+#
+
+#use strict; # Doesn't work
+use NetSNMP::OID qw(:all);
+use NetSNMP::agent;
+use NetSNMP::ASN qw(ASN_OCTET_STR ASN_COUNTER ASN_COUNTER64 ASN_INTEGER ASN_INTEGER64 ASN_UNSIGNED ASN_UNSIGNED64);
+#use Math::Int64 qw(uint64); # Skip that module whie we don't need it
+sub uint64 { return $_ }
+
+if (!$agent) {
+        print "This program must run as an embedded NetSNMP agent\n";
+        exit 1;
+}
+
+my $baseoid = '.1.3.6.1.4.1.8072.3.2.67';
+# Next are arrays of indexes (Type, initial value and increments)
+# Undef miltipliers are randomized
+my $multiline = "Cisco Internetwork Operating System Software
+IOS (tm) Catalyst 4000 L3 Switch Software (cat4000-I9K91S-M), Version
+12.2(20)EWA, RELEASE SOFTWARE (fc1)
+Technical Support: http://www.cisco.com/techsupport
+Copyright (c) 1986-2004 by cisco Systems, Inc.
+";
+my @fields = (ASN_OCTET_STR, ASN_UNSIGNED, ASN_UNSIGNED, ASN_COUNTER, ASN_COUNTER64, ASN_UNSIGNED);
+my @values = ($multiline, 4294965296, 1000, 4294965296, uint64("18446744073709351616"), int(rand(2**32)));
+my @incrts = (undef, 1000, -500, 1000, 100000, undef);
+
+# Number of elements in our OID
+my $oidelts;
+{
+        my @oid = split(/\./, $baseoid);
+        $oidelts = scalar(@oid);
+}
+
+my $regoid = new NetSNMP::OID($baseoid);
+$agent->register('check_snmp_agent', $regoid, \&my_snmp_handler);
+
+sub my_snmp_handler {
+        my ($handler, $registration_info, $request_info, $requests) = @_;
+        
+        for (my $request = $requests; $request; $request = $request->next) {
+                my $oid = $request->getOID();
+                my $index;
+                my $next_index;
+
+                # Validate the OID
+                my @numarray = $oid->to_array();
+                if (@numarray != $oidelts) {
+                        if ($request_info->getMode() == MODE_GETNEXT && @numarray == ($oidelts - 1)) {
+                                # GETNEXT for the base oid; set it to the first index
+                                push(@numarray, 0);
+                                $next_index = 0;
+                        } else {
+                                # We got a request for the base OID or with extra elements
+                                $request->setError($request_info, SNMP_ERR_NOERROR);
+                                next;
+                        }
+                }
+
+                $index = pop(@numarray);
+                if ($index >= scalar(@fields)) {
+                        # Index is out of bounds
+                        $request->setError($request_info, SNMP_ERR_NOERROR);
+                        next;
+                }
+
+                # Handle the request
+                if ($request_info->getMode() == MODE_GETNEXT) {
+                        if (++$index >= scalar(@fields)) {
+                                # Index will grow out of bounds
+                                $request->setError($request_info, SNMP_ERR_NOERROR);
+                                next;
+                        }
+                        $index = (defined($next_index) ? $next_index : $index);
+                        $request->setOID("$baseoid.$index");
+                } elsif ($request_info->getMode() != MODE_GET) {
+                        # Everything else is write-related modes
+                        $request->setError($request_info, SNMP_ERR_READONLY);
+                        next;
+                }
+
+                # Set the response... setValue is a bit touchy about the data type, but accepts plain strings.
+                my $value = sprintf("%s", $values[$index]);
+                $request->setValue($fields[$index], $value);
+
+                # And update the value
+                if (defined($incrts[$index])) {
+                        $values[$index] += $incrts[$index];
+                } elsif ($fields[$index] != ASN_OCTET_STR) {
+                        my $minus = int(rand(2))*-1;
+                        $minus = 1 unless ($minus);
+                        my $exp = 32;
+                        $exp = 64 if ($fields[$index]  == ASN_COUNTER64 || $fields[$index] == ASN_INTEGER64 || $fields[$index] == ASN_UNSIGNED64);
+                        $values[$index] = int(rand(2**$exp));
+                }
+        }
+}
+