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DNS_File-Transfer
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Added very basic upload

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master
Simon Moser vor 3 Jahren
Ursprung 3d65e69770
Commit 5f028a37bb
Es konnte kein GPG-Schlüssel zu dieser Signatur gefunden werden
GPG-Schlüssel-ID: 83765B895FF2CFC6
1 geänderte Dateien mit 142 neuen und 175 gelöschten Zeilen
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111
server
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@ -1,5 +1,4 @@
#!/usr/bin/env /usr/bin/python
# Why don't people use shebangs anymore. It's muppetry I say
# -*- coding: utf-8 -*-
"""
@ -7,22 +6,19 @@
to all requests
"""
from __future__ import print_function
import copy
import os
import os.path
import base64
import time
from dnslib import RR, QTYPE, TXT, CLASS, RCODE
from dnslib import RR, QTYPE, TXT
from dnslib.server import DNSServer, DNSHandler, BaseResolver, DNSLogger
from dnslib.label import DNSLabel
class FileResolver(BaseResolver):
"""
Respond with fixed response to all requests
"""
def __init__(self, directory, domain):
self.filelist = []
self.domain = domain
@ -31,12 +27,11 @@ class FileResolver(BaseResolver):
self.cache = {}
if directory:
if not os.path.isdir(directory):
print("Directory " + directory + " doesn't exist")
print(f"Directory {directory} doesn't exist")
exit()
def getcache(self, path):
cooked=""
pname=os.path.basename(path);
pname = os.path.basename(path)
if pname in self.cache:
# it's in the cache - so lets just read it from the cache
print("Taking from cache")
@ -67,27 +62,25 @@ class FileResolver(BaseResolver):
del self.cache[key]
def resolve(self, request, handler):
type=QTYPE[request.q.qtype]
qry_type = QTYPE[request.q.qtype]
name = request.q.qname
reply = request.reply()
if type == "TXT":
# Check for Chaos stuff first
if request.q.qclass == CLASS.CH:
if name == "version.bind":
reply.add_answer(*RR.fromZone('version.bind 60 CH TXT "Uninvited Guest 0.3"'))
if name == "authors.bind":
reply.add_answer(*RR.fromZone('authors.bind 60 CH TXT "David Lodge"'))
reply.add_answer(*RR.fromZone('authors.bind 60 CH TXT "Ian Williams"'))
if not reply.rr:
reply.header.rcode = RCODE.NXDOMAIN
# First check domain is at the end of the name
if not name.matchSuffix(self.domain):
reply.add_answer(RR(name, QTYPE.TXT, ttl=self.ttl, rdata=TXT("Domain not found")))
return reply
# Request method for uploads
if qry_type == "SRV":
with open('/tmp/dns-srv.log', 'w') as f:
f.write(name.stripSuffix(self.domain))
reply.add_answer(RR(name, QTYPE.SRV, ttl=self.ttl, rdata=TXT("accepted")))
# Request method for downloads
if qry_type == "TXT":
# Format is filename.count.domain for count
# First check domain is at the end of the name
if not name.matchSuffix(self.domain):
reply.add_answer(RR(name, QTYPE.TXT, ttl=self.ttl,
rdata=TXT("Domain not found")))
reply.add_answer(RR(name, QTYPE.TXT, ttl=self.ttl, rdata=TXT("Domain not found")))
return reply
# Now look whether we're looking for a count or a part
@ -96,22 +89,20 @@ class FileResolver(BaseResolver):
pname = '.'.join(parts[:-2])
path = self.directory + "/" + pname
if not os.path.isfile(path):
reply.add_answer(RR(name, QTYPE.TXT, ttl=self.ttl,
rdata=TXT("File not found")))
reply.add_answer(RR(name, QTYPE.TXT, ttl=self.ttl, rdata=TXT("File not found")))
return reply
# work out the count mathematically
# First work out the base64 size
l=os.path.getsize(path)
l=(4*l)/3
length = os.path.getsize(path)
length = (4 * length) / 3
# And padding
l+=(l%4)
length += (length % 4)
# Finally divide into number of 254 byte chunks
chunks=(l/254)
chunks = (length / 254)
if ''.join(parts[-2:-1]) == "count":
reply.add_answer(RR(name, QTYPE.TXT, ttl=self.ttl,
rdata=TXT(str(chunks))))
reply.add_answer(RR(name, QTYPE.TXT, ttl=self.ttl, rdata=TXT(str(chunks))))
return reply
if ''.join(parts[-2:-1]).isdigit():
@ -119,8 +110,7 @@ class FileResolver(BaseResolver):
# lets base64 the file
chunk = int(''.join(parts[-2:-1]))
if chunk > chunks or chunk < 0:
reply.add_answer(RR(name, QTYPE.TXT, ttl=self.ttl,
rdata=TXT("Chunk out of range")))
reply.add_answer(RR(name, QTYPE.TXT, ttl=self.ttl, rdata=TXT("Chunk out of range")))
return reply
# It's actually trying to read the file, so let's cache it in memory
cooked = self.getcache(path)
@ -128,66 +118,43 @@ class FileResolver(BaseResolver):
# Now lets just grab the chunk
start = chunk * 254
txtr = cooked[start:start + 254]
reply.add_answer(RR(name, QTYPE.TXT, ttl=self.ttl,
rdata=TXT(txtr)))
reply.add_answer(RR(name, QTYPE.TXT, ttl=self.ttl, rdata=TXT(txtr)))
return reply
# Replace labels with request label
return reply
if __name__ == '__main__':
import argparse,sys,time
if __name__ == '__main__':
import argparse
import time
p = argparse.ArgumentParser(description="Fixed DNS Resolver")
p.add_argument("--directory","-r",
metavar="<directory>",
help="Directory to pull files from")
p.add_argument("--domain","-d",
metavar="<domain>",
help="Domain we're working in")
p.add_argument("--port","-p",type=int,default=53,
metavar="<port>",
help="Server port (default:53)")
p.add_argument("--address","-a",default="",
metavar="<address>",
help="Listen address (default:all)")
p.add_argument("--udplen","-u",type=int,default=0,
metavar="<udplen>",
help="Max UDP packet length (default:0)")
p.add_argument("--tcp",action='store_true',default=False,
help="TCP server (default: UDP only)")
p.add_argument("--directory", "-r", metavar="<directory>", help="Directory to pull files from")
p.add_argument("--domain", "-d", metavar="<domain>", help="Domain we're working in")
p.add_argument("--port", "-p", type=int, default=53, metavar="<port>", help="Server port (default:53)")
p.add_argument("--address", "-a", default="", metavar="<address>", help="Listen address (default:all)")
p.add_argument("--udplen", "-u", type=int, default=0, metavar="<udplen>", help="Max UDP packet length (default:0)")
p.add_argument("--tcp", action='store_true', default=False, help="TCP server (default: UDP only)")
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)")
help="Log hooks (default: +request,+reply,+truncated,+error,-recv,-send,-data)")
p.add_argument("--log-prefix", action='store_true', default=False, help="Log prefix (default: False)")
args = p.parse_args()
resolver = FileResolver(args.directory, args.domain)
logger = DNSLogger(args.log, args.log_prefix)
print("Starting File Resolver (%s:%d) [%s]" % (
args.address or "*",
args.port,
"UDP/TCP" if args.tcp else "UDP"))
print(f"Starting File Resolver ({args.address or '*'}:{args.port}) [{'UDP/TCP' if args.tcp else 'UDP'}]")
if args.udplen:
DNSHandler.udplen = args.udplen
udp_server = DNSServer(resolver,
port=args.port,
address=args.address,
logger=logger)
udp_server = DNSServer(resolver, port=args.port, address=args.address, logger=logger)
udp_server.start_thread()
if args.tcp:
tcp_server = DNSServer(resolver,
port=args.port,
address=args.address,
tcp=True,
logger=logger)
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)

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