From 61dc6720867b17adbf0b58d53723e082a7193115 Mon Sep 17 00:00:00 2001
From: Alexander Sulfrian <alexander@sulfrian.net>
Date: Fri, 11 Jan 2013 04:05:57 +0100
Subject: allways print performance data (even on WARNING or CRITICAL)

---
 net_if | 54 +++++++++++++++++++++++++++++++++++++++++++-----------
 1 file changed, 43 insertions(+), 11 deletions(-)

diff --git a/net_if b/net_if
index 265ad80..6f25770 100755
--- a/net_if
+++ b/net_if
@@ -105,7 +105,9 @@ sub get_if_stats ($) {
 #     nagios status code
 #     additional message
 #     interface statistics
-sub print_stats ($) {
+sub print_stats ($$$) {
+    my $status = shift;
+    my $msg = shift;
     my $stats = shift;
     my ($count, $perfdata);
 
@@ -117,26 +119,56 @@ sub print_stats ($) {
         }
     }
 
-    msg('ok', "$count interfaces |$perfdata");
+    msg($status, "$count interfaces$msg |$perfdata");
 }
 
+# This function generate a nagios status code and an additional
+# message, based on the counts of the interfaces, that are down
+# or does not exist.
+#
+# parameter:
+#     list of down interfaces
+#     list of interfaces, that does not exists
+# returns:
+#     (status, msg) for nagios
+sub get_status ($$) {
+    my $down = shift;
+    my $error = shift;
+    my ($status, $msg) = ('ok', '');
+
+    # Order matters! LAST MATCH WINS.
+    if (@$down) {
+        # Chech whether some interfaces are down and we have to
+        # issue a warning.
+        my $count = @$down;
+        $down = join ", ", @$down;
+
+        $status = 'warn';
+        $msg = ", $count interface(s) are down ($down)";
+    }
 
-my ($interfaces, $down, $error) = get_if_status(@ARGV);
+    if (@$error) {
+        # Chech whether some interface or interface group, specified
+        # on the command line, does not exists and we should return a
+        # critical error.
+        my $count = @$error;
+        $error = join ", ", @$error;
 
-if (@$error) {
-    $error = join ", ", @$error;
-    msg('crit', "Some interfaces does not exists: $error");
-}
+        $status = 'crit';
+        $msg = ", $count interface(s) does not exists ($error)";
+    }
 
-if (@$down) {
-    $down = join ", ", @$down;
-    msg('warn', "Some interfaces are down: $down");
+    return ($status, $msg);
 }
 
+
+my ($interfaces, $down, $error) = get_if_status(@ARGV);
+my ($status, $msg) = get_status($down, $error);
+
 my $stats = {};
 for my $if (@$interfaces) {
     $stats->{$if} = get_if_stats($if);
 }
 
-print_stats($stats);
+print_stats($status, $msg, $stats);
 msg('crit', "End of script");
-- 
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