/usr/lib/python2.7/dist-packages/twisted/names/tap.py is in python-twisted-names 14.0.2-3.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 | # -*- test-case-name: twisted.names.test.test_tap -*-
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
Domain Name Server
"""
import os, traceback
from twisted.python import usage
from twisted.names import dns
from twisted.application import internet, service
from twisted.names import server
from twisted.names import authority
from twisted.names import secondary
class Options(usage.Options):
optParameters = [
["interface", "i", "", "The interface to which to bind"],
["port", "p", "53", "The port on which to listen"],
["resolv-conf", None, None,
"Override location of resolv.conf (implies --recursive)"],
["hosts-file", None, None, "Perform lookups with a hosts file"],
]
optFlags = [
["cache", "c", "Enable record caching"],
["recursive", "r", "Perform recursive lookups"],
["verbose", "v", "Log verbosely"],
]
compData = usage.Completions(
optActions={"interface" : usage.CompleteNetInterfaces()}
)
zones = None
zonefiles = None
def __init__(self):
usage.Options.__init__(self)
self['verbose'] = 0
self.bindfiles = []
self.zonefiles = []
self.secondaries = []
def opt_pyzone(self, filename):
"""Specify the filename of a Python syntax zone definition"""
if not os.path.exists(filename):
raise usage.UsageError(filename + ": No such file")
self.zonefiles.append(filename)
def opt_bindzone(self, filename):
"""Specify the filename of a BIND9 syntax zone definition"""
if not os.path.exists(filename):
raise usage.UsageError(filename + ": No such file")
self.bindfiles.append(filename)
def opt_secondary(self, ip_domain):
"""Act as secondary for the specified domain, performing
zone transfers from the specified IP (IP/domain)
"""
args = ip_domain.split('/', 1)
if len(args) != 2:
raise usage.UsageError("Argument must be of the form IP[:port]/domain")
address = args[0].split(':')
if len(address) == 1:
address = (address[0], dns.PORT)
else:
try:
port = int(address[1])
except ValueError:
raise usage.UsageError(
"Specify an integer port number, not %r" % (address[1],))
address = (address[0], port)
self.secondaries.append((address, [args[1]]))
def opt_verbose(self):
"""Increment verbosity level"""
self['verbose'] += 1
def postOptions(self):
if self['resolv-conf']:
self['recursive'] = True
self.svcs = []
self.zones = []
for f in self.zonefiles:
try:
self.zones.append(authority.PySourceAuthority(f))
except Exception:
traceback.print_exc()
raise usage.UsageError("Invalid syntax in " + f)
for f in self.bindfiles:
try:
self.zones.append(authority.BindAuthority(f))
except Exception:
traceback.print_exc()
raise usage.UsageError("Invalid syntax in " + f)
for f in self.secondaries:
svc = secondary.SecondaryAuthorityService.fromServerAddressAndDomains(*f)
self.svcs.append(svc)
self.zones.append(self.svcs[-1].getAuthority())
try:
self['port'] = int(self['port'])
except ValueError:
raise usage.UsageError("Invalid port: %r" % (self['port'],))
def _buildResolvers(config):
"""
Build DNS resolver instances in an order which leaves recursive
resolving as a last resort.
@type config: L{Options} instance
@param config: Parsed command-line configuration
@return: Two-item tuple of a list of cache resovers and a list of client
resolvers
"""
from twisted.names import client, cache, hosts
ca, cl = [], []
if config['cache']:
ca.append(cache.CacheResolver(verbose=config['verbose']))
if config['hosts-file']:
cl.append(hosts.Resolver(file=config['hosts-file']))
if config['recursive']:
cl.append(client.createResolver(resolvconf=config['resolv-conf']))
return ca, cl
def makeService(config):
ca, cl = _buildResolvers(config)
f = server.DNSServerFactory(config.zones, ca, cl, config['verbose'])
p = dns.DNSDatagramProtocol(f)
f.noisy = 0
ret = service.MultiService()
for (klass, arg) in [(internet.TCPServer, f), (internet.UDPServer, p)]:
s = klass(config['port'], arg, interface=config['interface'])
s.setServiceParent(ret)
for svc in config.svcs:
svc.setServiceParent(ret)
return ret
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