check_openvpn: Update to 20160803

check_openvpn/check_openvpn

@@ -1,10 +1,11 @@
-#! /usr/bin/python
+#!/usr/bin/env python
 
-# Check if an OpenVPN server runs on a given UDP port.
+# Check if an OpenVPN server runs on a given UDP or TCP port.
 #
 # Copyright 2013 Roland Wolters
+# Copyright 2016 Alarig Le Lay
 #
-# Version 20151106
+# Version 20160803
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -26,6 +27,7 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 import os
+import sys
 import time
 import hmac
 import hashlib
@@ -37,12 +39,15 @@ import binascii
 HMAC_CLIENT_KEY_START = 192
 BUFFER_SIZE = 1024
 
+ALGORITHMS_AVAILABLE = hashlib.algorithms_available \
+    if hasattr(hashlib, "algorithms_available") else hashlib.algorithms
+
 def ok(msg):
-    print 'OK: %s' % msg
+    print('OK: %s' % msg)
     return 0
 
 def critical(msg):
-    print 'CRIT: %s' % msg
+    print('CRIT: %s' % msg)
     return 2
 
 def buildpacket(tcp, key, digestmod):
@@ -55,14 +60,14 @@ def buildpacket(tcp, key, digestmod):
         h = hmac.new(key, digestmod=digestmod)
         h.update(struct.pack('>I', packet)) # packet id
         h.update(struct.pack('>I', ts)) # net time
-        h.update('\x38') # type
+        h.update(b'\x38') # type
         h.update(session) # session id
         h.update(struct.pack('>B', 0)) # message packet id array length
         h.update(struct.pack('>I', 0)) # message packet id
 
     # packet
-    result = ''
+    result = b''
-    result += '\x38' # type
+    result += b'\x38' # type
     result += session # session id
     if key: result += h.digest() # hmac
     result += struct.pack('>I', packet) # packet id
@@ -74,12 +79,18 @@ def buildpacket(tcp, key, digestmod):
 
 def checkserver(host, port, tcp, timeout, key, digest):
     packet = buildpacket(tcp, key, digest)
-    if tcp: checkserver_tcp(host, port, timeout, packet)
+    check = checkserver_tcp if tcp else checkserver_udp
-    else: checkserver_udp(host, port, timeout, packet)
+    return check(host, port, timeout, packet)
 
 def checkserver_udp(host, port, timeout, packet):
-    s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+    # thanks to glucas for the idea
+    try:
+        af, socktype, proto, canonname, sa = socket.getaddrinfo(host, port, \
+            socket.AF_UNSPEC, socket.SOCK_DGRAM)[0]
+        s = socket.socket(af, socktype, proto)
         s.settimeout(timeout)
+    except socket.error:
+        return critical('Unable to create UDP socket')
 
     try:
         s.sendto(packet, (host, port))
@@ -92,8 +103,13 @@ def checkserver_udp(host, port, timeout, packet):
         s.close()
 
 def checkserver_tcp(host, port, timeout, packet):
-    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+    try:
+        af, socktype, proto, canonname, sa = socket.getaddrinfo(host, port, \
+            socket.AF_UNSPEC, socket.SOCK_STREAM)[0]
+        s = socket.socket(af, socktype, proto)
         s.settimeout(timeout)
+    except socket.error:
+        return critical('Unable to create TCP socket')
 
     try:
         s.connect((host, port))
@@ -121,20 +137,20 @@ def readkey(path):
     key = key[index_start:index_end].replace('\n', '').replace('\r', '')
     return key
 
-def optionsparser(args=None):
+def optionsparser(argv=None):
     parser = argparse.ArgumentParser()
-    parser.add_argument('-p', '--port', help='set port number (default is %%default)', type=int, dest='port', default='1194')
+    parser.add_argument('-p', '--port', help='set port number (default is %(default)d)', type=int, default=1194)
     parser.add_argument('-t', '--tcp', help='use tcp instead of udp', action='store_true')
-    parser.add_argument('--timeout', help='set timeout (default is %%default)', type=int, default='5')
+    parser.add_argument('--timeout', help='set timeout (default is %(default)d)', type=int, default=5)
-    parser.add_argument('--digest', help='set HMAC digest (default is %%default)', type=str, default='sha1')
+    parser.add_argument('--digest', help='set HMAC digest (default is "%(default)s")', default='sha1')
     parser.add_argument('--digest-size', help='set HMAC digest size', type=int)
-    parser.add_argument('--digest-key', help='set HMAC key', type=str, default=None)
+    parser.add_argument('--digest-key', help='set HMAC key')
-    parser.add_argument('--tls-auth', help='set tls-auth file', type=str, default=None)
+    parser.add_argument('--tls-auth', help='set tls-auth file')
-    parser.add_argument('host', type=str, help='the OpenVPN host name or ip')
+    parser.add_argument('host', help='the OpenVPN host name or IP')
-    return parser.parse_args(args)
+    return parser.parse_args(argv)
 
-def main():
+def main(argv=None):
-    args = optionsparser()
+    args = optionsparser(argv)
 
     if args.digest_size and args.digest_size < 0:
         critical('digest size must be positive')
@@ -146,7 +162,7 @@ def main():
     digest_size = args.digest_size
 
     digest = digest.lower()
-    if digest not in hashlib.algorithms:
+    if digest not in ALGORITHMS_AVAILABLE:
         return critical('digest not available')
     try:
         digest = getattr(hashlib, digest)
@@ -166,4 +182,5 @@ def main():
     return checkserver(args.host, args.port, args.tcp, args.timeout, key, digest)
 
 if __name__ == '__main__':
-    main()
+    code = main()
+    sys.exit(code)

check_openvpn/control

@@ -1,6 +1,6 @@
 Homepage: https://raw.github.com/liquidat/nagios-icinga-checks/master/check_openvpn
 Watch: https://raw.github.com/liquidat/nagios-icinga-checks/master/check_openvpn Version\ ([0-9.]+)
 Recommends: libpython-stdlib
-Version: 20151106
+Version: 20160803
 Uploaders: Jan Wagner <waja@cyconet.org>
 Description: plugin to check if an OpenVPN server runs on a given port