64 lines
2.1 KiB
Python
64 lines
2.1 KiB
Python
import dns
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import dns.query
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import dns.update
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import dns.rdataclass
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import dns.rdatatype
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import dns.rdtypes.IN.A
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import dns.tsigkeyring
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import dns.rcode
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import threading
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from logger import Logger
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class LocalDnsHandlerException(Exception):
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def __init__(self, msg):
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Exception.__init__(self, msg)
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class DnsHandler(threading.Thread):
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def __init__(self, msgQueue, tsigKey, nsAddress, ttl):
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threading.Thread.__init__(self)
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self.msgQueue = msgQueue
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self.nsAddress = nsAddress
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self.ttl = ttl
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self.keyring = dns.tsigkeyring.from_text(tsigKey)
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self.setDaemon(True)
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def run(self):
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while(True):
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msg = self.msgQueue.get()
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if msg.address != msg.addressInDns:
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try:
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self.deleteARR(msg.dynid, msg.name, msg.zone, msg.addressInDns)
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self.insertARR(msg.dynid, msg.name, msg.zone, msg.address)
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Logger.log("Update: %s, %s.%s, %s -> %s" %
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(msg.dynid, msg.name, msg.zone, msg.addressInDns, msg.address))
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msg.addressInDns = msg.address
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except Exception, e:
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Logger.log("Failure for %s when updating DNS: %s" % (str(msg), str(e)))
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def insertARR(self, dynid, name, zone, address):
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# send A-RR insertion for ip to DNS server
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rr = dns.rdtypes.IN.A.A(dns.rdataclass.IN, dns.rdatatype.A, address)
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u = dns.update.Update(zone, keyring=self.keyring)
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u.add(name, self.ttl, rr)
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r = dns.query.tcp(u, self.nsAddress)
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rc = r.rcode()
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if rc != 0:
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raise LocalDnsHandlerException("failure when inserting: %d, %s" % (rc, dns.rcode.to_text(rc)))
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def deleteARR(self, dynid, name, zone, address):
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# send A-RR deletion for ip to DNS server
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rr = dns.rdtypes.IN.A.A(dns.rdataclass.IN, dns.rdatatype.A, address)
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u = dns.update.Update(zone, keyring=self.keyring)
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u.delete(name, rr)
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r = dns.query.tcp(u, self.nsAddress)
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rc = r.rcode()
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if rc != 0:
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raise LocalDnsHandlerException("failure when deleting: %d, %s" % (rc, dns.rcode.to_text(rc)))
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