94 lines
2.6 KiB
Python
94 lines
2.6 KiB
Python
import dns.query
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import dns.tsigkeyring
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import dns.update
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from optparse import OptionParser
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import re
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import string
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import sys
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# dnsupdate.py
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# Updates a dynamic dns-record using a TSIG key.
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domain = "lubcke.se"
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keyname = "lubcke.se."
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keysecret = "ZGhNJ05b8ThmHOXhJvkvMw=="
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ttl = 60
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def main():
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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")
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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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global domain, keyname, keysecret, ttl
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if options.domain:
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domain = options.domain
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if options.keyname:
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keyname = options.keyname
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if options.password:
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keysecret = options.password
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if options.ttl:
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ttl = options.ttl
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if not options.ipaddress or not options.name:
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print "IP address and hostname are 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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global hostname, ipaddress
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ipaddress = options.ipaddress
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hostname = options.name
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update()
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def update():
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# Sanity check incoming data
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global hostname, ipaddress, ttl
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hostname = string.replace(hostname, "."+domain, '')
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if not re.search('^[12]?[0-9]?[0-9](\.[12]?[0-9]?[0-9]){3}$', ipaddress):
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print "Invalid ip address '%s'" % 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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keyname: 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(domain, keyring=keyring, keyname=keyname)
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# update.replace(hostname, ttl, record-type, new ip)
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update.replace(hostname, ttl, 'a', 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" % (hostname, domain, 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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main() |