Renamed a name and password to hostname and keysecret

Added -u option to refer to a webpage where the machines ip can be verified
Enabled comments in the config file
Minor error message changes

dnsupdate.py

@@ -3,13 +3,13 @@
 # Updates a dynamic dns-record using a TSIG key.
 
 
-def checkerror(msg):
+def checkerror(msg, show=""):
   # Determine if there are any errors reported
   if len(msg['error']) > 0:
-    if not msg.has_key('quiet'):
+    if show and not msg.has_key('quiet'):
       for error in msg['error']:
         print "Error: %s" % error
-      print "Use -h for help"
+      print "Use -h option for help"
     return 1
   else:
     return 0
@@ -19,11 +19,14 @@ def checkerror(msg):
 def get_ipaddress():
   # Connect to a remote server to determine which ip address
   # this host connects from
+  import re
   import urllib
   remote = opener = urllib.FancyURLopener({})
   try:
-    f = opener.open("http://www.wahlberg.se/~fredrik/ip.php")
+    f = opener.open(msg['ipurl'])
-    ip = f.read().strip()
+    page = f.read()
+    res = re.search('[12]?[0-9]?[0-9](\.[12]?[0-9]?[0-9]){3}', page)
+    ip = res.group()
     return ip
   except:
     msg['error'].append("Could not determine ip address automatically,\n       use -i switch to enter manually")
@@ -53,15 +56,18 @@ def getparams(msg):
   parser.add_option("-k", "--keyname", 
                     type="string",
                     help="Name of the TSIG key")
-  parser.add_option("-n", "--name", 
+  parser.add_option("-n", "--hostname", 
                     type="string",
                     help="Hostname of local machine")
-  parser.add_option("-p", "--password", 
-                    type="string",
-                    help="TSIG key")
   parser.add_option("-q", "--quiet", 
                     action="store_true",
                     help="Quit mode")
+  parser.add_option("-s", "--keysecret", 
+                    type="string",
+                    help="TSIG key")
+  parser.add_option("-u", "--ipurl", 
+                    type="string",
+                    help="URL to ip server")
   parser.add_option("-t", "--ttl", 
                     type="int",
                     help="TTL in seconds")
@@ -78,25 +84,24 @@ def getparams(msg):
   base_params = ['delete',
                  'domain',
                  'force',
+                 'hostname',
                  'keyname',
+                 'keysecret',
                  'quiet',
-                  'ttl']
+                 'ttl',
+                 'ipurl']
 
   for param in base_params:
     if eval('options.' + param):
       msg[param] = eval('options.' + param)
 
-  # These parameters have other names than their keys, stupid...      
+  # These parameters needs special handling
   if options.ipaddress:
     msg['ipaddress'] = options.ipaddress
   else:
     ip = get_ipaddress()
     if ip:
       msg['ipaddress'] = ip
-  if options.name:
-    msg['hostname'] = options.name
-  if options.password:
-    msg['keysecret'] = options.password
 
   return msg
 
@@ -117,7 +122,11 @@ def readcfg(msg):
     cfgfile = open(msg['cfgfile'], 'r')
 
   for line in cfgfile.readlines():
+    line = line.strip()
+    if line.find("#", 0, 1) == 0:
+      continue
     (key, value) = line.split('\t', 1)
+    if not value.strip().lower() == "false":
       msg[key] = value.strip()
   
   cfgfile.close()
@@ -149,7 +158,7 @@ def update(msg):
   try: 
     response = dns.query.tcp(update, '217.78.32.198')
   except:
-    msg['error'].append("An error has occurred, check your keyname and password.")
+    msg['error'].append("An error has occurred, check your keyname and keysecret.")
     return 
   
   # Verify response
@@ -208,16 +217,19 @@ if __name__=="__main__":
 
   getparams(msg)
   validate(msg)
+  
+  err = checkerror(msg)
+  if err == 0:
     if not msg.has_key('force'):
       verify_ip(msg)
 
   err = checkerror(msg)
-
   if err == 0:
     update(msg)
     checkerror(msg)
     if err == 0:
       sys.exit(0)
 
+  err = checkerror(msg, show="errors")
   sys.exit(1)