From 079f520913487f557070859b6be2cb484e8441fd Mon Sep 17 00:00:00 2001
From: Alexander Sulfrian <alexander@sulfrian.net>
Date: Thu, 10 Jan 2013 01:36:49 +0100
Subject: inital commit

---
 net_if | 102 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 102 insertions(+)
 create mode 100755 net_if

diff --git a/net_if b/net_if
new file mode 100755
index 0000000..09a5b91
--- /dev/null
+++ b/net_if
@@ -0,0 +1,102 @@
+#!/usr/bin/perl -T
+
+use warnings;
+use strict;
+
+$ENV{'PATH'} = '/bin:/usr/bin:/sbin:/usr/sbin';
+delete @ENV{'IFS', 'CDPATH', 'ENV', 'BASH_ENV'};
+
+sub critical {
+    print "CRITICAL - @_\n";
+    exit 2;
+}
+
+sub warning {
+    print "WARNING - @_\n";
+    exit 1;
+}
+
+sub ok {
+    print "OK - @_\n";
+    exit 0;
+}
+
+sub get_if_status {
+    my (@up, @down, @error);
+
+    while (@_) {
+        my $if = shift @_;
+        next unless ($if =~ m/^([-\w]+)$/);
+        $if = $1;
+
+        my $pid = open(IFCONFIG, "-|");
+        die "$0: fork: $!" unless defined $pid;
+
+        if ($pid == 0) {
+            # child
+            open(STDERR, ">", "/dev/null");
+            exec("ifconfig", $if)
+        }
+
+        while (<IFCONFIG>) {
+            if ($_ =~ m/$if: flags=([0-9]+)</) {
+                if ($1 & 1) {
+                    push(@up, $if);
+                }
+                else {
+                    push (@down, $if);
+                }
+            }
+        }
+
+        close(IFCONFIG) or push(@error, $if);
+    }
+
+    return (\@up, \@down, \@error);
+}
+
+sub get_if_stats {
+    my $if = shift @_;
+    my $stats = {};
+
+    open(PFCTL, "-|", "pfctl", "-vvsI", "-i", $if);
+    while (<PFCTL>) {
+        if ($_ =~ m{In4/Pass.*Bytes: ([0-9]+)}) {
+            $stats->{'in4'} = $1;
+        }
+        elsif ($_ =~ m{Out4/Pass.*Bytes: ([0-9]+)}) {
+            $stats->{'out4'} = $1;
+        }
+        elsif ($_ =~ m{In6/Pass.*Bytes: ([0-9]+)}) {
+            $stats->{'in6'} = $1;
+        }
+        elsif ($_ =~ m{Out6/Pass.*Bytes: ([0-9]+)}) {
+            $stats->{'out6'} = $1;
+        }
+    }
+    close(PFCTL);
+
+    return $stats;
+}
+
+my ($up, $down, $error) = get_if_status(@ARGV);
+
+if (@$error) {
+    $error = join ", ", @$error;
+    critical("Some interfaces does not exists: $error");
+}
+
+if (@$down) {
+    $down = join ", ", @$down;
+    warning("Some interfaces are down: $down");
+}
+
+my $stats = {};
+while (@$up) {
+    my $if = shift @$up;
+    $stats->{$if} = get_if_stats($if);
+}
+
+use Data::Dumper;
+print Dumper $stats;
+print "\n";
-- 
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