From 5508e60112dad4e30300d807442c7e9795acf1fe Mon Sep 17 00:00:00 2001
From: Alexander Sulfrian <alexander@sulfrian.net>
Date: Fri, 20 Sep 2013 15:18:53 +0200
Subject: add nagios-plugin output

---
 check_snmp_switch_traffic.pl | 20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/check_snmp_switch_traffic.pl b/check_snmp_switch_traffic.pl
index be6bbcf..2b832be 100755
--- a/check_snmp_switch_traffic.pl
+++ b/check_snmp_switch_traffic.pl
@@ -21,7 +21,7 @@ sub snmp_walk($$$) {
         my $results = $session->get_next_request(
             -varbindlist => [ $oid ]
         );
-        return unless $results;
+        nagios_die($session->error()) unless $results;
     
         foreach my $result (keys %{ $results }) {
             return unless index($result, "${start}.") eq 0;
@@ -92,13 +92,20 @@ sub get_info ($$) {
             }
         }
         else {
-            print $session->error();
+            nagios_die($session->error());
         }
     }
 
     return $IFACES;
 }
 
+sub nagios_die ($) {
+    my $err = shift;
+    $err = "Unknown error" unless defined $err;
+    print "SNMP UNKNOWN - $err\n";
+    exit 3;
+}
+
 my $host;
 my $port = 161;
 my $community = 'public';
@@ -118,17 +125,18 @@ my ($session, $err) = Net::SNMP->session(
     -port => $port,
     -community => $community
 );
-die "[ERROR] $err\n" unless defined $session;
+nagios_die($err) unless defined $session;
 
 my $IFACES = get_ifaces($session);
 get_info($session, $IFACES);
+$session->close();
 
+print "SNMP OK |";
 foreach my $key (sort {$a <=> $b} keys %{ $IFACES }) {
-    printf "%s(in)=%s; %s(out)=%s; ", $IFACES->{$key}{'name'}, $IFACES->{$key}{'in'}, $IFACES->{$key}{'name'}, $IFACES->{$key}{'out'};
+    printf " %s(in)=%sc; %s(out)=%sc;", $IFACES->{$key}{'name'}, $IFACES->{$key}{'in'}, $IFACES->{$key}{'name'}, $IFACES->{$key}{'out'};
 }
 print "\n";
-
-$session->close();
+exit 0;
 
 __END__
 
-- 
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