在 Python3 中創建一個帶有網站阻止的 DNS 服務器？
[英]Create a DNS Server in Python3 with website blocking?
問題描述
我可以使用阻止/重定向某些網站 URL 的 python3 創建一個 DNS 服務器嗎？ 我曾嘗試使用 dnslib，但似乎無法阻止 URL。
我正在嘗試創建一個可以在 DNS 級別阻止網站的程序，我知道 pi-hole 但我想創建自己的。
到目前為止我的代碼（修改后的示例代碼）：
# -*- coding: utf-8 -*-
"""
InterceptResolver - proxy requests to upstream server
(optionally intercepting)
"""
from __future__ import print_function
import binascii,copy,socket,struct,sys
from dnslib import DNSRecord,RR,QTYPE,RCODE,parse_time
from dnslib.server import DNSServer,DNSHandler,BaseResolver,DNSLogger
from dnslib.label import DNSLabel
class InterceptResolver(BaseResolver):
"""
Intercepting resolver
Proxy requests to upstream server optionally intercepting requests
matching local records
"""
def __init__(self,address,port,ttl,intercept,skip,nxdomain,forward,all_qtypes,timeout=0):
"""
address/port - upstream server
ttl - default ttl for intercept records
intercept - list of wildcard RRs to respond to (zone format)
skip - list of wildcard labels to skip
nxdomain - list of wildcard labels to return NXDOMAIN
forward - list of wildcard labels to forward
all_qtypes - intercept all qtypes if qname matches.
timeout - timeout for upstream server(s)
"""
self.address = address
self.port = port
self.ttl = parse_time(ttl)
self.skip = skip
self.nxdomain = nxdomain
self.forward = []
for i in forward:
qname, _, upstream = i.partition(':')
upstream_ip, _, upstream_port = upstream.partition(':')
self.forward.append((qname, upstream_ip, int(upstream_port or '53')))
self.all_qtypes = all_qtypes
self.timeout = timeout
self.zone = []
for i in intercept:
if i == '-':
i = sys.stdin.read()
for rr in RR.fromZone(i,ttl=self.ttl):
self.zone.append((rr.rname,QTYPE[rr.rtype],rr))
def resolve(self,request,handler):
matched = False
reply = request.reply()
qname = request.q.qname
qtype = QTYPE[request.q.qtype]
# Try to resolve locally unless on skip list
if not any([qname.matchGlob(s) for s in self.skip]):
for name,rtype,rr in self.zone:
if qname.matchGlob(name):
if qtype in (rtype,'ANY','CNAME'):
a = copy.copy(rr)
a.rname = qname
reply.add_answer(a)
matched = True
# Check for NXDOMAIN
if any([qname.matchGlob(s) for s in self.nxdomain]):
reply.header.rcode = getattr(RCODE,'NXDOMAIN')
return reply
if matched and self.all_qtypes:
return reply
# Otherwise proxy, first checking forwards, then to upstream.
upstream, upstream_port = self.address,self.port
if not any([qname.matchGlob(s) for s in self.skip]):
for name, ip, port in self.forward:
if qname.matchGlob(name):
upstream, upstream_port = ip, port
if not reply.rr:
try:
if handler.protocol == 'udp':
proxy_r = request.send(upstream,upstream_port,
timeout=self.timeout)
else:
proxy_r = request.send(upstream,upstream_port,
tcp=True,timeout=self.timeout)
reply = DNSRecord.parse(proxy_r)
except socket.timeout:
reply.header.rcode = getattr(RCODE,'SERVFAIL')
return reply
if __name__ == '__main__':
import argparse,sys,time
p = argparse.ArgumentParser(description="DNS Intercept Proxy")
p.add_argument("--port","-p",type=int,default=53,
metavar="<port>",
help="Local proxy port (default:53)")
p.add_argument("--address","-a",default="",
metavar="<address>",
help="Local proxy listen address (default:all)")
p.add_argument("--upstream","-u",default="8.8.8.8:53",
metavar="<dns server:port>",
help="Upstream DNS server:port (default:8.8.8.8:53)")
p.add_argument("--intercept","-i",action="append",
metavar="<zone record>",
help="Intercept requests matching zone record (glob) ('-' for stdin)")
p.add_argument("--skip","-s",action="append",
metavar="<label>",
help="Don't intercept matching label (glob)")
p.add_argument("--nxdomain","-x",action="append",
metavar="<label>",
help="Return NXDOMAIN (glob)")
p.add_argument("--forward","-f",action="append",
metavar="<label:dns server:port>",
help="forward requests matching label (glob) to dns server")
p.add_argument("--ttl","-t",default="60s",
metavar="<ttl>",
help="Intercept TTL (default: 60s)")
p.add_argument("--timeout","-o",type=float,default=5,
metavar="<timeout>",
help="Upstream timeout (default: 5s)")
p.add_argument("--all-qtypes",action='store_true',default=False,
help="Return an empty response if qname matches, but qtype doesn't")
p.add_argument("--log",default="request,reply,truncated,error",
help="Log hooks to enable (default: +request,+reply,+truncated,+error,-recv,-send,-data)")
p.add_argument("--log-prefix",action='store_true',default=False,
help="Log prefix (timestamp/handler/resolver) (default: False)")
args = p.parse_args()
args.dns,_,args.dns_port = args.upstream.partition(':')
args.dns_port = int(args.dns_port or 53)
tcpEnabled = True
resolver = InterceptResolver(args.dns,
args.dns_port,
args.ttl,
args.intercept or [],
args.skip or [],
args.nxdomain or [],
args.forward or [],
args.all_qtypes,
args.timeout)
logger = DNSLogger(args.log,args.log_prefix)
print("Starting Intercept Proxy (%s:%d -> %s:%d) [%s]" % (
args.address or "*",args.port,
args.dns,args.dns_port,
"UDP/TCP" if tcpEnabled else "UDP"))
for rr in resolver.zone:
print(" | ",rr[2].toZone(),sep="")
if resolver.nxdomain:
print(" NXDOMAIN:",", ".join(resolver.nxdomain))
if resolver.skip:
print(" Skipping:",", ".join(resolver.skip))
if resolver.forward:
print(" Forwarding:")
for i in resolver.forward:
print(" | ","%s:%s:%s" % i,sep="")
DNSHandler.log = {
#'log_request', # DNS Request
#'log_reply', # DNS Response
#'log_truncated', # Truncated
#'log_error', # Decoding error
}
udp_server = DNSServer(resolver,
port=args.port,
address=args.address,
logger=logger)
udp_server.start_thread()
if tcpEnabled:
tcp_server = DNSServer(resolver,
port=args.port,
address=args.address,
tcp=True,
logger=logger)
tcp_server.start_thread()
while udp_server.isAlive():
time.sleep(1)
#print(DNSHandler.log)
#print("LOG START")
print(logger.currentLog)
#print("LOG END")
我還在 dnslib 庫中稍微修改了 server.py 文件：
# -*- coding: utf-8 -*-
"""
DNS server framework - intended to simplify creation of custom resolvers.
Comprises the following components:
DNSServer - socketserver wrapper (in most cases you should just
need to pass this an appropriate resolver instance
and start in either foreground/background)
DNSHandler - handler instantiated by DNSServer to handle requests
The 'handle' method deals with the sending/receiving
packets (handling TCP length prefix) and delegates
the protocol handling to 'get_reply'. This decodes
packet, hands off a DNSRecord to the Resolver instance,
and encodes the returned DNSRecord.
In most cases you dont need to change DNSHandler unless
you need to get hold of the raw protocol data in the
Resolver
DNSLogger - The class provides a default set of logging functions for
the various stages of the request handled by a DNSServer
instance which are enabled/disabled by flags in the 'log'
class variable.
Resolver - Instance implementing a 'resolve' method that receives
the decodes request packet and returns a response.
To implement a custom resolver in most cases all you need
is to implement this interface.
Note that there is only a single instance of the Resolver
so need to be careful about thread-safety and blocking
The following examples use the server framework:
fixedresolver.py - Simple resolver which will respond to all
requests with a fixed response
zoneresolver.py - Resolver which will take a standard zone
file input
shellresolver.py - Example of a dynamic resolver
proxy.py - DNS proxy
intercept.py - Intercepting DNS proxy
>>> resolver = BaseResolver()
>>> logger = DNSLogger(prefix=False)
>>> server = DNSServer(resolver,port=8053,address="localhost",logger=logger)
>>> server.start_thread()
>>> q = DNSRecord.question("abc.def")
>>> a = q.send("localhost",8053)
Request: [...] (udp) / 'abc.def.' (A)
Reply: [...] (udp) / 'abc.def.' (A) / NXDOMAIN
>>> print(DNSRecord.parse(a))
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: ...
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;abc.def. IN A
>>> server.stop()
>>> class TestResolver:
... def resolve(self,request,handler):
... reply = request.reply()
... reply.add_answer(*RR.fromZone("abc.def. 60 A 1.2.3.4"))
... return reply
>>> resolver = TestResolver()
>>> server = DNSServer(resolver,port=8053,address="localhost",logger=logger,tcp=True)
>>> server.start_thread()
>>> a = q.send("localhost",8053,tcp=True)
Request: [...] (tcp) / 'abc.def.' (A)
Reply: [...] (tcp) / 'abc.def.' (A) / RRs: A
>>> print(DNSRecord.parse(a))
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: ...
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;abc.def. IN A
;; ANSWER SECTION:
abc.def. 60 IN A 1.2.3.4
>>> server.stop()
"""
from __future__ import print_function
import binascii,socket,struct,threading,time
try:
import socketserver
except ImportError:
import SocketServer as socketserver
from dnslib import DNSRecord,DNSError,QTYPE,RCODE,RR
class BaseResolver(object):
"""
Base resolver implementation. Provides 'resolve' method which is
called by DNSHandler with the decode request (DNSRecord instance)
and returns a DNSRecord instance as reply.
In most cases you should be able to create a custom resolver by
just replacing the resolve method with appropriate resolver code for
application (see fixedresolver/zoneresolver/shellresolver for
examples)
Note that a single instance is used by all DNSHandler instances so
need to consider blocking & thread safety.
"""
def resolve(self,request,handler):
"""
Example resolver - respond to all requests with NXDOMAIN
"""
reply = request.reply()
reply.header.rcode = getattr(RCODE,'NXDOMAIN')
return reply
class DNSHandler(socketserver.BaseRequestHandler):
"""
Handler for socketserver. Transparently handles both TCP/UDP requests
(TCP requests have length prepended) and hands off lookup to resolver
instance specified in <SocketServer>.resolver
"""
udplen = 0 # Max udp packet length (0 = ignore)
def handle(self):
if self.server.socket_type == socket.SOCK_STREAM:
self.protocol = 'tcp'
data = self.request.recv(8192)
if len(data) < 2:
self.server.logger.log_error(self,"Request Truncated")
return
length = struct.unpack("!H",bytes(data[:2]))[0]
while len(data) - 2 < length:
new_data = self.request.recv(8192)
if not new_data:
break
data += new_data
data = data[2:]
else:
self.protocol = 'udp'
data,connection = self.request
self.server.logger.log_recv(self,data)
try:
rdata = self.get_reply(data)
self.server.logger.log_send(self,rdata)
if self.protocol == 'tcp':
rdata = struct.pack("!H",len(rdata)) + rdata
self.request.sendall(rdata)
else:
connection.sendto(rdata,self.client_address)
except DNSError as e:
self.server.logger.log_error(self,e)
def get_reply(self,data):
request = DNSRecord.parse(data)
self.server.logger.log_request(self,request)
resolver = self.server.resolver
reply = resolver.resolve(request,self)
self.server.logger.log_reply(self,reply)
if self.protocol == 'udp':
rdata = reply.pack()
if self.udplen and len(rdata) > self.udplen:
truncated_reply = reply.truncate()
rdata = truncated_reply.pack()
self.server.logger.log_truncated(self,truncated_reply)
else:
rdata = reply.pack()
return rdata
class DNSLogger:
"""
The class provides a default set of logging functions for the various
stages of the request handled by a DNSServer instance which are
enabled/disabled by flags in the 'log' class variable.
To customise logging create an object which implements the DNSLogger
interface and pass instance to DNSServer.
The methods which the logger instance must implement are:
log_recv - Raw packet received
log_send - Raw packet sent
log_request - DNS Request
log_reply - DNS Response
log_truncated - Truncated
log_error - Decoding error
log_data - Dump full request/response
"""
def __init__(self,log="",prefix=True,verbose=False):
"""
Selectively enable log hooks depending on log argument
(comma separated list of hooks to enable/disable)
- If empty enable default log hooks
- If entry starts with '+' (eg. +send,+recv) enable hook
- If entry starts with '-' (eg. -data) disable hook
- If entry doesn't start with +/- replace defaults
Prefix argument enables/disables log prefix
"""
self.verbose = verbose
self.currentLog = []
default = ["request","reply","truncated","error"]
log = log.split(",") if log else []
enabled = set([ s for s in log if s[0] not in '+-'] or default)
[ enabled.add(l[1:]) for l in log if l.startswith('+') ]
[ enabled.discard(l[1:]) for l in log if l.startswith('-') ]
for l in ['log_recv','log_send','log_request','log_reply',
'log_truncated','log_error','log_data']:
if l[4:] not in enabled:
setattr(self,l,self.log_pass)
self.prefix = prefix
def log_pass(self,*args):
pass
def log_prefix(self,handler):
if self.prefix:
return "%s [%s:%s] " % (time.strftime("%Y-%m-%d %X"),
handler.__class__.__name__,
handler.server.resolver.__class__.__name__)
else:
return ""
def log_recv(self,handler,data):
log = "%sReceived: [%s:%d] (%s) <%d> : %s" % (
self.log_prefix(handler),
handler.client_address[0],
handler.client_address[1],
handler.protocol,
len(data),
binascii.hexlify(data))
self.currentLog.append(log)
if self.verbose:
print(log)
def log_send(self,handler,data):
log = "%sSent: [%s:%d] (%s) <%d> : %s" % (
self.log_prefix(handler),
handler.client_address[0],
handler.client_address[1],
handler.protocol,
len(data),
binascii.hexlify(data))
self.currentLog.append(log)
if self.verbose:
print(log)
def log_request(self,handler,request):
log = "%sRequest: [%s:%d] (%s) / '%s' (%s)" % (
self.log_prefix(handler),
handler.client_address[0],
handler.client_address[1],
handler.protocol,
request.q.qname,
QTYPE[request.q.qtype])
self.currentLog.append(log)
if self.verbose:
print(log)
self.log_data(request)
def log_reply(self,handler,reply):
if reply.header.rcode == RCODE.NOERROR:
log = "%sReply: [%s:%d] (%s) / '%s' (%s) / RRs: %s" % (
self.log_prefix(handler),
handler.client_address[0],
handler.client_address[1],
handler.protocol,
reply.q.qname,
QTYPE[reply.q.qtype],
",".join([QTYPE[a.rtype] for a in reply.rr]))
else:
log = "%sReply: [%s:%d] (%s) / '%s' (%s) / %s" % (
self.log_prefix(handler),
handler.client_address[0],
handler.client_address[1],
handler.protocol,
reply.q.qname,
QTYPE[reply.q.qtype],
RCODE[reply.header.rcode])
self.currentLog.append(log)
if self.verbose:
print(log)
self.log_data(reply)
def log_truncated(self,handler,reply):
log = "%sTruncated Reply: [%s:%d] (%s) / '%s' (%s) / RRs: %s" % (
self.log_prefix(handler),
handler.client_address[0],
handler.client_address[1],
handler.protocol,
reply.q.qname,
QTYPE[reply.q.qtype],
",".join([QTYPE[a.rtype] for a in reply.rr]))
self.currentLog.append(log)
if self.verbose:
print(log)
self.log_data(reply)
def log_error(self,handler,e):
log = "%sInvalid Request: [%s:%d] (%s) :: %s" % (
self.log_prefix(handler),
handler.client_address[0],
handler.client_address[1],
handler.protocol,
e)
self.currentLog.append(log)
if self.verbose:
print(log)
def log_data(self,dnsobj):
print("\n",dnsobj.toZone(" "),"\n",sep="")
self.dataLog = str("\n" + str(dnsobj.toZone(" ")) + "\n" + str(sep=""))
class UDPServer(socketserver.ThreadingMixIn,socketserver.UDPServer):
allow_reuse_address = True
class TCPServer(socketserver.ThreadingMixIn,socketserver.TCPServer):
allow_reuse_address = True
class DNSServer(object):
"""
Convenience wrapper for socketserver instance allowing
either UDP/TCP server to be started in blocking more
or as a background thread.
Processing is delegated to custom resolver (instance) and
optionally custom logger (instance), handler (class), and
server (class)
In most cases only a custom resolver instance is required
(and possibly logger)
"""
def __init__(self,resolver,
address="",
port=53,
tcp=False,
logger=None,
handler=DNSHandler,
server=None):
"""
resolver: resolver instance
address: listen address (default: "")
port: listen port (default: 53)
tcp: UDP (false) / TCP (true) (default: False)
logger: logger instance (default: DNSLogger)
handler: handler class (default: DNSHandler)
server: socketserver class (default: UDPServer/TCPServer)
"""
if not server:
if tcp:
server = TCPServer
else:
server = UDPServer
self.server = server((address,port),handler)
self.server.resolver = resolver
self.server.logger = logger or DNSLogger()
def start(self):
self.server.serve_forever()
def start_thread(self):
self.thread = threading.Thread(target=self.server.serve_forever)
self.thread.daemon = True
self.thread.start()
def stop(self):
self.server.shutdown()
def isAlive(self):
return self.thread.is_alive()
if __name__ == "__main__":
import doctest,sys
sys.exit(0 if doctest.testmod(optionflags=doctest.ELLIPSIS).failed == 0 else 1)
1 個解決方案
解決方案1
0 已采納 2021-01-02 10:42:59
我通過在攔截類本身中添加一個 if 語句並在 if 語句為真時將 DNS 重定向到 0.0.0.0 來做到這一點的。 我知道可以優化此代碼並且可以刪除其中的某些部分。
# -*- coding: utf-8 -*-
"""
InterceptResolver - proxy requests to upstream server
(optionally intercepting)
"""
from __future__ import print_function
import binascii,copy,socket,struct,sys
from dnslib import DNSRecord,RR,QTYPE,RCODE,parse_time
from dnslib.server import DNSServer,DNSHandler,BaseResolver,DNSLogger
from dnslib.label import DNSLabel
# Custom DNSLogger class with variable verbose setting
class variableVerboseDNSLogger(DNSLogger):
"""
The class provides a default set of logging functions for the various
stages of the request handled by a DNSServer instance which are
enabled/disabled by flags in the 'log' class variable.
To customise logging create an object which implements the DNSLogger
interface and pass instance to DNSServer.
The methods which the logger instance must implement are:
log_recv - Raw packet received
log_send - Raw packet sent
log_request - DNS Request
log_reply - DNS Response
log_truncated - Truncated
log_error - Decoding error
log_data - Dump full request/response
"""
def __init__(self,log="",prefix=True,verbose=False,logToList=False):
"""
Selectively enable log hooks depending on log argument
(comma separated list of hooks to enable/disable)
- If empty enable default log hooks
- If entry starts with '+' (eg. +send,+recv) enable hook
- If entry starts with '-' (eg. -data) disable hook
- If entry doesn't start with +/- replace defaults
Prefix argument enables/disables log prefix
"""
self.verbose = verbose
self.logToList = logToList
self.currentLog = []
default = ["request","reply","truncated","error"]
log = log.split(",") if log else []
enabled = set([ s for s in log if s[0] not in '+-'] or default)
[ enabled.add(l[1:]) for l in log if l.startswith('+') ]
[ enabled.discard(l[1:]) for l in log if l.startswith('-') ]
for l in ['log_recv','log_send','log_request','log_reply',
'log_truncated','log_error','log_data']:
if l[4:] not in enabled:
setattr(self,l,self.log_pass)
self.prefix = prefix
def log_pass(self,*args):
pass
def log_prefix(self,handler):
if self.prefix:
return "%s [%s:%s] " % (time.strftime("%Y-%m-%d %X"),
handler.__class__.__name__,
handler.server.resolver.__class__.__name__)
else:
return ""
def log_recv(self,handler,data):
log = "%sReceived: [%s:%d] (%s) <%d> : %s" % (
self.log_prefix(handler),
handler.client_address[0],
handler.client_address[1],
handler.protocol,
len(data),
binascii.hexlify(data))
if self.verbose:
print(log)
if self.logToList:
self.currentLog.append(log)
def log_send(self,handler,data):
log = "%sSent: [%s:%d] (%s) <%d> : %s" % (
self.log_prefix(handler),
handler.client_address[0],
handler.client_address[1],
handler.protocol,
len(data),
binascii.hexlify(data))
if self.verbose:
print(log)
if self.logToList:
self.currentLog.append(log)
def log_request(self,handler,request):
log = "%sRequest: [%s:%d] (%s) / '%s' (%s)" % (
self.log_prefix(handler),
handler.client_address[0],
handler.client_address[1],
handler.protocol,
request.q.qname,
QTYPE[request.q.qtype])
if self.verbose:
print(log)
if self.logToList:
self.currentLog.append(log)
self.log_data(request)
def log_reply(self,handler,reply):
if reply.header.rcode == RCODE.NOERROR:
log = "%sReply: [%s:%d] (%s) / '%s' (%s) / RRs: %s" % (
self.log_prefix(handler),
handler.client_address[0],
handler.client_address[1],
handler.protocol,
reply.q.qname,
QTYPE[reply.q.qtype],
",".join([QTYPE[a.rtype] for a in reply.rr]))
else:
log = "%sReply: [%s:%d] (%s) / '%s' (%s) / %s" % (
self.log_prefix(handler),
handler.client_address[0],
handler.client_address[1],
handler.protocol,
reply.q.qname,
QTYPE[reply.q.qtype],
RCODE[reply.header.rcode])
if self.verbose:
print(log)
if self.logToList:
self.currentLog.append(log)
self.log_data(reply)
def log_truncated(self,handler,reply):
log = "%sTruncated Reply: [%s:%d] (%s) / '%s' (%s) / RRs: %s" % (
self.log_prefix(handler),
handler.client_address[0],
handler.client_address[1],
handler.protocol,
reply.q.qname,
QTYPE[reply.q.qtype],
",".join([QTYPE[a.rtype] for a in reply.rr]))
if self.verbose:
print(log)
if self.logToList:
self.currentLog.append(log)
self.log_data(reply)
def log_error(self,handler,e):
log = "%sInvalid Request: [%s:%d] (%s) :: %s" % (
self.log_prefix(handler),
handler.client_address[0],
handler.client_address[1],
handler.protocol,
e)
if self.verbose:
print(log)
if self.logToList:
self.currentLog.append(log)
def log_data(self,dnsobj):
print("\n",dnsobj.toZone(" "),"\n",sep="")
self.dataLog = str("\n" + str(dnsobj.toZone(" ")) + "\n" + str(sep=""))
class InterceptResolver(BaseResolver):
"""
Intercepting resolver
Proxy requests to upstream server optionally intercepting requests
matching local records
"""
def __init__(self,address,port,ttl,intercept,skip,nxdomain,forward,all_qtypes,timeout=0):
"""
address/port - upstream server
ttl - default ttl for intercept records
intercept - list of wildcard RRs to respond to (zone format)
skip - list of wildcard labels to skip
nxdomain - list of wildcard labels to return NXDOMAIN
forward - list of wildcard labels to forward
all_qtypes - intercept all qtypes if qname matches.
timeout - timeout for upstream server(s)
"""
self.address = address
self.port = port
self.ttl = parse_time(ttl)
self.skip = skip
self.nxdomain = nxdomain
self.forward = []
for i in forward:
qname, _, upstream = i.partition(':')
upstream_ip, _, upstream_port = upstream.partition(':')
self.forward.append((qname, upstream_ip, int(upstream_port or '53')))
self.all_qtypes = all_qtypes
self.timeout = timeout
self.zone = []
for i in intercept:
if i == '-':
i = sys.stdin.read()
for rr in RR.fromZone(i,ttl=self.ttl):
self.zone.append((rr.rname,QTYPE[rr.rtype],rr))
def resolve(self,request,handler):
matched = False
reply = request.reply()
qname = request.q.qname
qtype = QTYPE[request.q.qtype]
# Check for NXDOMAIN
print("QNAME label= " + str(qname) + "\n")
# Send to to upstream
upstream, upstream_port = self.address,self.port
if not reply.rr:
try:
if handler.protocol == 'udp':
proxy_r = request.send(upstream,upstream_port,
timeout=self.timeout)
else:
proxy_r = request.send(upstream,upstream_port,
tcp=True,timeout=self.timeout)
reply = DNSRecord.parse(proxy_r)
# Detects if URL is the one below
if(qname == "google.com."):
# Returns generic IP address
print("REPLY = " + str(reply))
reply = request.reply()
reply.add_answer(". A 0.0.0.0")
print("REPLY = " + str(reply))
except socket.timeout:
reply.header.rcode = getattr(RCODE,'SERVFAIL')
return reply
if __name__ == '__main__':
import argparse,sys,time
# Most of these don't do anything so dont use them
p = argparse.ArgumentParser(description="DNS Intercept Proxy, please ignore arguments and run it")
p.add_argument("--intercept","-i",action="append",
metavar="<zone record>",
help="Intercept requests matching zone record (glob) ('-' for stdin)")
p.add_argument("--skip","-s",action="append",
metavar="<label>",
help="Don't intercept matching label (glob)")
p.add_argument("--nxdomain","-x",action="append",
metavar="<label>",
help="Return NXDOMAIN (glob)")
p.add_argument("--forward","-f",action="append",
metavar="<label:dns server:port>",
help="forward requests matching label (glob) to dns server")
p.add_argument("--ttl","-t",default="60s",
metavar="<ttl>",
help="Intercept TTL (default: 60s)")
p.add_argument("--timeout","-o",type=float,default=5,
metavar="<timeout>",
help="Upstream timeout (default: 5s)")
p.add_argument("--all-qtypes",action='store_true',default=False,
help="Return an empty response if qname matches, but qtype doesn't")
p.add_argument("--log",default="request,reply,truncated,error",
help="Log hooks to enable (default: +request,+reply,+truncated,+error,-recv,-send,-data)")
p.add_argument("--log-prefix",action='store_true',default=False,
help="Log prefix (timestamp/handler/resolver) (default: False)")
args = p.parse_args()
#'args.dns,_,args.dns_port = args.upstream.partition(':')
#args.dns_port = int(args.dns_port or 53)
tcpEnabled = True
externalDNS = "***.***.***.***"
port = 53
externalDNSPort = 53
resolver = InterceptResolver(address = externalDNS,
port = externalDNSPort,
ttl = "60s",
intercept = args.intercept or [],
skip = args.skip or [],
nxdomain = args.nxdomain or [],
forward = args.forward or [],
all_qtypes = args.all_qtypes,
timeout = args.timeout)
logger = variableVerboseDNSLogger(log = args.log,
prefix = args.log_prefix,
verbose = False,
logToList = True)
print("Starting Intercept Proxy (%s:%d -> %s:%d) [%s]" % (
externalDNS or "*",port,
externalDNS,externalDNSPort,
"UDP/TCP" if tcpEnabled else "UDP"))
for rr in resolver.zone:
print(" | ",rr[2].toZone(),sep="")
if resolver.nxdomain:
print(" NXDOMAIN:",", ".join(resolver.nxdomain))
if resolver.skip:
print(" Skipping:",", ".join(resolver.skip))
if resolver.forward:
print(" Forwarding:")
for i in resolver.forward:
print(" | ","%s:%s:%s" % i,sep="")
DNSHandler.log = {
#'log_request', # DNS Request
#'log_reply', # DNS Response
#'log_truncated', # Truncated
#'log_error', # Decoding error
}
udp_server = DNSServer(resolver,
port=port,
address="",
logger=logger)
udp_server.start_thread()
if tcpEnabled:
tcp_server = DNSServer(resolver,
port=port,
address="",
tcp=True,
logger=logger)
tcp_server.start_thread()
while udp_server.isAlive():
time.sleep(1)
#print(DNSHandler.log)
#print("LOG START")
#print(logger.currentLog)
logger.currentLog = []
#print("LOG END")
我正在嘗試使用python3為我的wordpress網站創建一個搜尋器
[英]I'm trying to create a crawler for my wordpress website using python3
Python2 -> Python3 套接字在 python2 中是非阻塞的，但在 python3 中阻塞時間更長
[英]Python2 -> Python3 Socket is non-blocking in python2, but blocks longer in python3
Python3隊列：什么時候可以等待無超時的阻塞返回None？
[英]Python3 queue: When can a blocking wait with no timeout return None?
聲明:本站的技術帖子網頁，遵循CC BY-SA 4.0協議，如果您需要轉載，請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.
相關問題
python3 DNS域阻止腳本
Python3 創建守護進程
SMTP 服務器與python3
我正在嘗試使用python3為我的wordpress網站創建一個搜尋器
Python2 -> Python3 套接字在 python2 中是非阻塞的，但在 python3 中阻塞時間更長
Python3隊列：什么時候可以等待無超時的阻塞返回None？
Pycryptodome Python3 RSA.importKey阻止/掛起
Python3非阻塞輸入或殺死線程
Python3以阻塞模式讀取字符設備
使用 Python3 和 Matplotlib 創建 animation
相關標簽