Add default gw check

git-svn-id: svn+ssh://asteria.noreply.org/svn/weaselutils/trunk@105 bc3d92e2-beff-0310-a7cd-cc87d7ac0ede

1 files changed, 49 insertions, 0 deletions

diff --git a/nagios-check-default-gw b/nagios-check-default-gw
new file mode 100755
index 0000000..88b3ef0
--- /dev/null
+++ b/nagios-check-default-gw
@@ -0,0 +1,49 @@
+#!/usr/bin/ruby
+
+require 'optparse'
+
+NAGIOS_STATUS = { :OK => 0, :WARNING => 1, :CRITICAL => 2, :UNKNOWN => -1 };
+@verbose = 0;
+@additional_nameservers = []
+
+def show_help(parser, code=0, io=STDOUT)
+  program_name = File.basename($0, '.*')
+  io.puts "Usage: #{program_name} [options]"
+  io.puts parser.summarize
+  exit(code)
+end
+ARGV.options do |opts|
+        opts.on_tail("-h", "--help" , "Display this help screen")                { show_help(opts) }
+        opts.parse!
+end
+show_help(ARGV.options, 1, STDERR) if ARGV.length > 0
+
+unless File.executable?('/sbin/ip')
+	puts "/sbin/ip is not executable"
+	exit NAGIOS_STATUS[:UNKNOWN]
+end
+
+ip_output = nil
+IO.popen("-") do |f|
+	unless f  # child
+		begin
+			exec('/sbin/ip', 'route', 'show', '0.0.0.0/0')
+		rescue => e
+			puts "Cannot exec ip: "+e.message
+			exit 1
+		end
+	end
+	ip_output = f.readlines
+end
+
+if $? != 0
+	puts "Child exited with non-zero exit code(%d): %s"%[$? >> 8, ip_output]
+else
+	if ip_output.length > 0
+		puts "OK: %s" % [ip_output.join(' ')]
+		exit NAGIOS_STATUS[:OK]
+	else
+		puts "CRITICAL: no default route found."
+		exit NAGIOS_STATUS[:CRITICAL]
+	end
+end