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dnsserver.py
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# -*- coding: utf-8 -*-
import sys, os
import random
import re
import time
import inspect
from logger import logger
sys.path.append('../lib')
from twisted.names import dns, server, client, cache, common, resolve
from twisted.python import failure
from twisted.internet import defer
typeToMethod = {
dns.A: 'lookupAddress',
dns.AAAA: 'lookupIPV6Address',
dns.A6: 'lookupAddress6',
dns.NS: 'lookupNameservers',
dns.CNAME: 'lookupCanonicalName',
dns.SOA: 'lookupAuthority',
dns.MB: 'lookupMailBox',
dns.MG: 'lookupMailGroup',
dns.MR: 'lookupMailRename',
dns.NULL: 'lookupNull',
dns.WKS: 'lookupWellKnownServices',
dns.PTR: 'lookupPointer',
dns.HINFO: 'lookupHostInfo',
dns.MINFO: 'lookupMailboxInfo',
dns.MX: 'lookupMailExchange',
dns.TXT: 'lookupText',
dns.SPF: 'lookupSenderPolicy',
dns.RP: 'lookupResponsibility',
dns.AFSDB: 'lookupAFSDatabase',
dns.SRV: 'lookupService',
dns.NAPTR: 'lookupNamingAuthorityPointer',
dns.AXFR: 'lookupZone',
dns.ALL_RECORDS: 'lookupAllRecords',
}
smartType = ('lookupAddress', 'lookupAuthority')
class FailureHandler:
def __init__(self, resolver, query, timeout, addr = None, edns = None):
self.resolver = resolver
self.query = query
self.timeout = timeout
self.addr = addr
self.edns = edns
def __call__(self, failure):
# AuthoritativeDomainErrors should halt resolution attempts
failure.trap(dns.DomainError, defer.TimeoutError, NotImplementedError)
return self.resolver(self.query, self.timeout, self.addr, self.edns)
class MapResolver(client.Resolver):
def __init__(self, Finder, Amapping, NSmapping, SOAmapping, servers):
self.Finder = Finder
self.Amapping = Amapping
self.NSmapping = NSmapping
self.SOAmapping = SOAmapping
client.Resolver.__init__(self, servers=servers)
def query(self, query, timeout = None, addr = None, edns = None):
try:
if typeToMethod[query.type] in smartType:
return self.typeToMethod[query.type](str(query.name), timeout, addr, edns)
else:
return self.typeToMethod[query.type](str(query.name), timeout)
except KeyError, e:
return defer.fail(failure.Failure(NotImplementedError(str(self.__class__) + " " + str(query.type))))
def lookupAddress(self, name, timeout = None, addr = None, edns = None):
if name in self.Amapping:
ttl = self.Amapping[name]['ttl']
def packResult( value ):
ret = []
add = []
for x in value:
ret.append(dns.RRHeader(name, dns.A, dns.IN, ttl, dns.Record_A(x, ttl), True))
if edns is not None:
if edns.rdlength > 8:
add.append(dns.RRHeader('', dns.EDNS, 4096, edns.ttl, edns.payload, True))
else:
add.append(dns.RRHeader('', dns.EDNS, 4096, 0, dns.Record_EDNS(None, 0), True))
return [ret, (), add]
result = self.Finder.FindIP(str(addr[0]), name)
#返回的IP数组乱序
random.shuffle(result)
return packResult(result)
else:
return self._lookup(name, dns.IN, dns.A, timeout)
def lookupNameservers(self, name, timeout=None):
if name in self.NSmapping:
result = self.NSmapping[name]
ttl = result['ttl']
record = re.split(ur',|\s+', result['record'])
def packResultNS(value):
ret = []
for x in value:
ret.append(dns.RRHeader(name, dns.NS, dns.IN, ttl, dns.Record_NS(x, ttl), True))
return [ret, (), ()]
return packResultNS(record)
else:
return self._lookup(name, dns.IN, dns.NS, timeout)
def lookupAuthority(self, name, timeout=None, addr = None, edns = None):
if name in self.SOAmapping:
result = self.SOAmapping[name]
add = []
def packResultSOA(value):
if edns is not None:
if edns.rdlength > 8:
add.append(dns.RRHeader('', dns.EDNS, 4096, edns.ttl, edns.payload, True))
else:
add.append(dns.RRHeader('', dns.EDNS, 4096, 0, dns.Record_EDNS(None, 0), True))
return [(dns.RRHeader(name, dns.SOA, dns.IN, value['ttl'], dns.Record_SOA(value['record'], value['email'], value['serial'], value['refresh'], value['retry'], value['expire'], value['ttl']), True),),
(),
add
]
ret = packResultSOA(result)
logger.info("SOA\t[domain: %s]\t[return: %s]\t[additional: %s]" % \
(name, result, add))
return ret
else:
return self._lookup(name, dns.IN, dns.SOA, timeout)
def lookupIPV6Address(self, name, timeout = None, addr = None):
return [(),(),()]
class SmartResolverChain(resolve.ResolverChain):
def __init__(self, resolvers):
#resolve.ResolverChain.__init__(self, resolvers)
common.ResolverBase.__init__(self)
self.resolvers = resolvers
def _lookup(self, name, cls, type, timeout, addr = None, edns = None):
q = dns.Query(name, type, cls)
#d = self.resolvers[0].query(q, timeout)
d = defer.fail(failure.Failure(dns.DomainError(name)))
for r in self.resolvers[1:]:
d = d.addErrback(
FailureHandler(r.query, q, timeout, addr, edns)
)
return d
def query(self, query, timeout = None, addr = None, edns = None):
try:
if typeToMethod[query.type] in smartType:
return self.typeToMethod[query.type](str(query.name), timeout, addr, edns)
else:
return self.typeToMethod[query.type](str(query.name), timeout)
except KeyError, e:
return defer.fail(failure.Failure(NotImplementedError(str(self.__class__) + " " + str(query.type))))
def lookupAddress(self, name, timeout = None, addr = None, edns = None):
return self._lookup(name, dns.IN, dns.A, timeout, addr, edns)
def lookupAuthority(self, name, timeout=None, addr = None, edns = None):
return self._lookup(name, dns.IN, dns.SOA, timeout, addr, edns)
def lookupIPV6Address(self, name, timeout = None, addr = None, edns = None):
return self._lookup(name, dns.IN, dns.AAAA, timeout, addr, edns)
def lookupNameservers(self, name, timeout = None, addr = None, edns = None):
return self._lookup(name, dns.IN, dns.NS, timeout, addr, edns)
class SmartDNSFactory(server.DNSServerFactory):
def handleQuery(self, message, protocol, address):
#if len(message.additional) > 0:
# print inspect.getmembers(message.additional[0]
# 可以支持多个query
query = message.queries[0]
edns = None
cliAddr = address
if query.type == 43 or typeToMethod[query.type] == 'lookupAllRecords':
return [(),(),()]
if typeToMethod[query.type] in smartType and \
len(message.additional) != 0 and \
message.additional[0].type == 41 \
and message.additional[0].rdlength > 8:
cliAddr = (message.additional[0].payload.dottedQuad(), 0)
edns = message.additional[0]
logger.info("[type: %s]\t[protocol: %s]\t[query: %s]\t[address: %s]\t[dns_server_addr: %s]\t[additional: %s]" % \
(typeToMethod[query.type], type(protocol), query, cliAddr[0], address[0], edns))
return self.resolver.query(query, addr = cliAddr, edns = edns).addCallback(
self.gotResolverResponse, protocol, message, address
).addErrback(
self.gotResolverError, protocol, message, address
)
def __init__(self, authorities = None, caches = None, clients = None, verbose = 0):
resolvers = []
if authorities is not None:
resolvers.extend(authorities)
if caches is not None:
resolvers.extend(caches)
if clients is not None:
resolvers.extend(clients)
self.canRecurse = not not clients
self.resolver = SmartResolverChain(resolvers)
self.verbose = verbose
if caches:
self.cache = caches[-1]
self.connections = []