106 lines
3.1 KiB
Python
106 lines
3.1 KiB
Python
# dnsupdate.py
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# Updates a dynamic dns-record using a TSIG key.
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class dnsvalues:
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def __init__(self):
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self.domain = "lubcke.se"
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self.keyname = "lubcke.se."
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self.keysecret = "ZGhNJ05b8ThmHOXhJvkvMw=="
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self.ttl = 60
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def get_ipaddress():
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# Connects to the dns server to determine which ip address
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# this host connects from
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import urllib
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remote = opener = urllib.FancyURLopener({})
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f = opener.open("http://www.wahlberg.se/~fredrik/ip.php")
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ip = f.read().strip()
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return ip
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def main():
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from optparse import OptionParser
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import sys
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# Define option parameters
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usage = "usage: %prog [-n] hostname [-i] ip adress [OPTIONS]"
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parser = OptionParser(usage)
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parser.add_option("-d", "--domain",
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type="string",
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help="Name of the domain to update")
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parser.add_option("-i", "--ipaddress",
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type="string",
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help="IP-address of the host [auto detected]")
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parser.add_option("-k", "--keyname",
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type="string",
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help="Name of the TSIG key")
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parser.add_option("-n", "--name",
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type="string",
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help="Name of the host to update")
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parser.add_option("-p", "--password",
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type="string",
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help="The TSIG key")
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parser.add_option("-t", "--ttl",
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type="int",
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help="TTL in seconds")
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(options, args) = parser.parse_args()
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if options.ipaddress:
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msg.ipaddress = options.ipaddress
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else:
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msg.ipaddress = get_ipaddress()
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if options.domain:
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msg.domain = options.domain
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if options.keyname:
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msg.keyname = options.keyname
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if options.password:
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msg.keysecret = options.password
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if options.ttl:
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msg.ttl = options.ttl
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if not options.name:
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print "A hostname is required for operation.\nEnter '%s -h' for usage information" % sys.argv[0]
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return
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else:
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msg.hostname = options.name
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update()
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def update():
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import dns.query
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import dns.tsigkeyring
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import dns.update
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import re
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import string
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# The update function connects to the dns server
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# Sanity check incoming data
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#global hostname, ipaddress, ttl
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msg.hostname = string.replace(msg.hostname, "."+msg.domain, '')
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if not re.search('^[12]?[0-9]?[0-9](\.[12]?[0-9]?[0-9]){3}$', msg.ipaddress):
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print "Invalid ip address '%s'" % msg.ipaddress
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return
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# The name of the key and the secret
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keyring = dns.tsigkeyring.from_text({
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msg.keyname: msg.keysecret
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})
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# dns.update.Update(name of domain, keyring, keyname)
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update = dns.update.Update(msg.domain, keyring=keyring, keyname=msg.keyname)
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# update.replace(hostname, ttl, record-type, new ip)
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update.replace(msg.hostname, msg.ttl, 'a', msg.ipaddress)
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# doit, servername
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response = dns.query.tcp(update, 'nic.wahlberg.se')
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# Verify response
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if response.rcode() == 0:
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print "Host '%s.%s' has been added with ip address %s" % (msg.hostname, msg.domain, msg.ipaddress)
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else:
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print "An error has occurred, the server returned:\n%s" % response
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if __name__=="__main__":
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msg = dnsvalues()
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main() |