589 lines
15 KiB
Python
589 lines
15 KiB
Python
|
# Domain Name Server (DNS) interface
|
||
|
|
#
|
||
|
|
# See RFC 1035:
|
||
|
|
# ------------------------------------------------------------------------
|
||
|
|
# Network Working Group P. Mockapetris
|
||
|
|
# Request for Comments: 1035 ISI
|
||
|
|
# November 1987
|
||
|
|
# Obsoletes: RFCs 882, 883, 973
|
||
|
|
#
|
||
|
|
# DOMAIN NAMES - IMPLEMENTATION AND SPECIFICATION
|
||
|
|
# ------------------------------------------------------------------------
|
||
|
|
|
||
|
|
|
||
|
|
import string
|
||
|
|
|
||
|
|
import dnstype
|
||
|
|
import dnsclass
|
||
|
|
import dnsopcode
|
||
|
|
|
||
|
|
|
||
|
|
# Low-level 16 and 32 bit integer packing and unpacking
|
||
|
|
|
||
|
|
def pack16bit(n):
|
||
|
|
return chr((n>>8)&0xFF) + chr(n&0xFF)
|
||
|
|
|
||
|
|
def pack32bit(n):
|
||
|
|
return chr((n>>24)&0xFF) + chr((n>>16)&0xFF) \
|
||
|
|
+ chr((n>>8)&0xFF) + chr(n&0xFF)
|
||
|
|
|
||
|
|
def unpack16bit(s):
|
||
|
|
return (ord(s[0])<<8) | ord(s[1])
|
||
|
|
|
||
|
|
def unpack32bit(s):
|
||
|
|
return (ord(s[0])<<24) | (ord(s[1])<<16) \
|
||
|
|
| (ord(s[2])<<8) | ord(s[3])
|
||
|
|
|
||
|
|
def addr2bin(addr):
|
||
|
|
if type(addr) == type(0):
|
||
|
|
return addr
|
||
|
|
bytes = string.splitfields(addr, '.')
|
||
|
|
if len(bytes) != 4: raise ValueError, 'bad IP address'
|
||
|
|
n = 0
|
||
|
|
for byte in bytes: n = n<<8 | string.atoi(byte)
|
||
|
|
return n
|
||
|
|
|
||
|
|
def bin2addr(n):
|
||
|
|
return '%d.%d.%d.%d' % ((n>>24)&0xFF, (n>>16)&0xFF,
|
||
|
|
(n>>8)&0xFF, n&0xFF)
|
||
|
|
|
||
|
|
|
||
|
|
# Packing class
|
||
|
|
|
||
|
|
class Packer:
|
||
|
|
def __init__(self):
|
||
|
|
self.buf = ''
|
||
|
|
self.index = {}
|
||
|
|
def getbuf(self):
|
||
|
|
return self.buf
|
||
|
|
def addbyte(self, c):
|
||
|
|
if len(c) != 1: raise TypeError, 'one character expected'
|
||
|
|
self.buf = self.buf + c
|
||
|
|
def addbytes(self, bytes):
|
||
|
|
self.buf = self.buf + bytes
|
||
|
|
def add16bit(self, n):
|
||
|
|
self.buf = self.buf + pack16bit(n)
|
||
|
|
def add32bit(self, n):
|
||
|
|
self.buf = self.buf + pack32bit(n)
|
||
|
|
def addaddr(self, addr):
|
||
|
|
n = addr2bin(addr)
|
||
|
|
self.buf = self.buf + pack32bit(n)
|
||
|
|
def addstring(self, s):
|
||
|
|
self.addbyte(chr(len(s)))
|
||
|
|
self.addbytes(s)
|
||
|
|
def addname(self, name):
|
||
|
|
# Domain name packing (section 4.1.4)
|
||
|
|
# Add a domain name to the buffer, possibly using pointers.
|
||
|
|
# The case of the first occurrence of a name is preserved.
|
||
|
|
# Redundant dots are ignored.
|
||
|
|
list = []
|
||
|
|
for label in string.splitfields(name, '.'):
|
||
|
|
if label:
|
||
|
|
if len(label) > 63:
|
||
|
|
raise PackError, 'label too long'
|
||
|
|
list.append(label)
|
||
|
|
keys = []
|
||
|
|
for i in range(len(list)):
|
||
|
|
key = string.upper(string.joinfields(list[i:], '.'))
|
||
|
|
keys.append(key)
|
||
|
|
if self.index.has_key(key):
|
||
|
|
pointer = self.index[key]
|
||
|
|
break
|
||
|
|
else:
|
||
|
|
i = len(list)
|
||
|
|
pointer = None
|
||
|
|
# Do it into temporaries first so exceptions don't
|
||
|
|
# mess up self.index and self.buf
|
||
|
|
buf = ''
|
||
|
|
offset = len(self.buf)
|
||
|
|
index = []
|
||
|
|
for j in range(i):
|
||
|
|
label = list[j]
|
||
|
|
n = len(label)
|
||
|
|
if offset + len(buf) < 0x3FFF:
|
||
|
|
index.append(keys[j], offset + len(buf))
|
||
|
|
else:
|
||
|
|
print 'dnslib.Packer.addname:',
|
||
|
|
print 'warning: pointer too big'
|
||
|
|
buf = buf + (chr(n) + label)
|
||
|
|
if pointer:
|
||
|
|
buf = buf + pack16bit(pointer | 0xC000)
|
||
|
|
else:
|
||
|
|
buf = buf + '\0'
|
||
|
|
self.buf = self.buf + buf
|
||
|
|
for key, value in index:
|
||
|
|
self.index[key] = value
|
||
|
|
def dump(self):
|
||
|
|
keys = self.index.keys()
|
||
|
|
keys.sort()
|
||
|
|
print '-'*40
|
||
|
|
for key in keys:
|
||
|
|
print '%20s %3d' % (key, self.index[key])
|
||
|
|
print '-'*40
|
||
|
|
space = 1
|
||
|
|
for i in range(0, len(self.buf)+1, 2):
|
||
|
|
if self.buf[i:i+2] == '**':
|
||
|
|
if not space: print
|
||
|
|
space = 1
|
||
|
|
continue
|
||
|
|
space = 0
|
||
|
|
print '%4d' % i,
|
||
|
|
for c in self.buf[i:i+2]:
|
||
|
|
if ' ' < c < '\177':
|
||
|
|
print ' %c' % c,
|
||
|
|
else:
|
||
|
|
print '%2d' % ord(c),
|
||
|
|
print
|
||
|
|
print '-'*40
|
||
|
|
|
||
|
|
|
||
|
|
# Unpacking class
|
||
|
|
|
||
|
|
UnpackError = 'dnslib.UnpackError' # Exception
|
||
|
|
|
||
|
|
class Unpacker:
|
||
|
|
def __init__(self, buf):
|
||
|
|
self.buf = buf
|
||
|
|
self.offset = 0
|
||
|
|
def getbyte(self):
|
||
|
|
c = self.buf[self.offset]
|
||
|
|
self.offset = self.offset + 1
|
||
|
|
return c
|
||
|
|
def getbytes(self, n):
|
||
|
|
s = self.buf[self.offset : self.offset + n]
|
||
|
|
if len(s) != n: raise UnpackError, 'not enough data left'
|
||
|
|
self.offset = self.offset + n
|
||
|
|
return s
|
||
|
|
def get16bit(self):
|
||
|
|
return unpack16bit(self.getbytes(2))
|
||
|
|
def get32bit(self):
|
||
|
|
return unpack32bit(self.getbytes(4))
|
||
|
|
def getaddr(self):
|
||
|
|
return bin2addr(self.get32bit())
|
||
|
|
def getstring(self):
|
||
|
|
return self.getbytes(ord(self.getbyte()))
|
||
|
|
def getname(self):
|
||
|
|
# Domain name unpacking (section 4.1.4)
|
||
|
|
c = self.getbyte()
|
||
|
|
i = ord(c)
|
||
|
|
if i & 0xC0 == 0xC0:
|
||
|
|
d = self.getbyte()
|
||
|
|
j = ord(d)
|
||
|
|
pointer = ((i<<8) | j) & ~0xC000
|
||
|
|
save_offset = self.offset
|
||
|
|
try:
|
||
|
|
self.offset = pointer
|
||
|
|
domain = self.getname()
|
||
|
|
finally:
|
||
|
|
self.offset = save_offset
|
||
|
|
return domain
|
||
|
|
if i == 0:
|
||
|
|
return ''
|
||
|
|
domain = self.getbytes(i)
|
||
|
|
remains = self.getname()
|
||
|
|
if not remains:
|
||
|
|
return domain
|
||
|
|
else:
|
||
|
|
return domain + '.' + remains
|
||
|
|
|
||
|
|
|
||
|
|
# Test program for packin/unpacking (section 4.1.4)
|
||
|
|
|
||
|
|
def testpacker():
|
||
|
|
N = 25
|
||
|
|
R = range(N)
|
||
|
|
import timing
|
||
|
|
# See section 4.1.4 of RFC 1035
|
||
|
|
timing.start()
|
||
|
|
for i in R:
|
||
|
|
p = Packer()
|
||
|
|
p.addbytes('*' * 20)
|
||
|
|
p.addname('f.ISI.ARPA')
|
||
|
|
p.addbytes('*' * 8)
|
||
|
|
p.addname('Foo.F.isi.arpa')
|
||
|
|
p.addbytes('*' * 18)
|
||
|
|
p.addname('arpa')
|
||
|
|
p.addbytes('*' * 26)
|
||
|
|
p.addname('')
|
||
|
|
timing.finish()
|
||
|
|
print round(timing.milli() * 0.001 / N, 3), 'seconds per packing'
|
||
|
|
p.dump()
|
||
|
|
u = Unpacker(p.buf)
|
||
|
|
u.getbytes(20)
|
||
|
|
u.getname()
|
||
|
|
u.getbytes(8)
|
||
|
|
u.getname()
|
||
|
|
u.getbytes(18)
|
||
|
|
u.getname()
|
||
|
|
u.getbytes(26)
|
||
|
|
u.getname()
|
||
|
|
timing.start()
|
||
|
|
for i in R:
|
||
|
|
u = Unpacker(p.buf)
|
||
|
|
res = (u.getbytes(20),
|
||
|
|
u.getname(),
|
||
|
|
u.getbytes(8),
|
||
|
|
u.getname(),
|
||
|
|
u.getbytes(18),
|
||
|
|
u.getname(),
|
||
|
|
u.getbytes(26),
|
||
|
|
u.getname())
|
||
|
|
timing.finish()
|
||
|
|
print round(timing.milli() * 0.001 / N, 3), 'seconds per unpacking'
|
||
|
|
for item in res: print item
|
||
|
|
|
||
|
|
|
||
|
|
# Pack/unpack RR toplevel format (section 3.2.1)
|
||
|
|
|
||
|
|
class RRpacker(Packer):
|
||
|
|
def __init__(self):
|
||
|
|
Packer.__init__(self)
|
||
|
|
self.rdstart = None
|
||
|
|
def addRRheader(self, name, type, klass, ttl, *rest):
|
||
|
|
self.addname(name)
|
||
|
|
self.add16bit(type)
|
||
|
|
self.add16bit(klass)
|
||
|
|
self.add32bit(ttl)
|
||
|
|
if rest:
|
||
|
|
if res[1:]: raise TypeError, 'too many args'
|
||
|
|
rdlength = rest[0]
|
||
|
|
else:
|
||
|
|
rdlength = 0
|
||
|
|
self.add16bit(rdlength)
|
||
|
|
self.rdstart = len(self.buf)
|
||
|
|
def patchrdlength(self):
|
||
|
|
rdlength = unpack16bit(self.buf[self.rdstart-2:self.rdstart])
|
||
|
|
if rdlength == len(self.buf) - self.rdstart:
|
||
|
|
return
|
||
|
|
rdata = self.buf[self.rdstart:]
|
||
|
|
save_buf = self.buf
|
||
|
|
ok = 0
|
||
|
|
try:
|
||
|
|
self.buf = self.buf[:self.rdstart-2]
|
||
|
|
self.add16bit(len(rdata))
|
||
|
|
self.buf = self.buf + rdata
|
||
|
|
ok = 1
|
||
|
|
finally:
|
||
|
|
if not ok: self.buf = save_buf
|
||
|
|
def endRR(self):
|
||
|
|
if self.rdstart is not None:
|
||
|
|
self.patchrdlength()
|
||
|
|
self.rdstart = None
|
||
|
|
def getbuf(self):
|
||
|
|
if self.rdstart is not None: self.patchrdlenth()
|
||
|
|
return Packer.getbuf(self)
|
||
|
|
# Standard RRs (section 3.3)
|
||
|
|
def addCNAME(self, name, klass, ttl, cname):
|
||
|
|
self.addRRheader(name, dnstype.CNAME, klass, ttl)
|
||
|
|
self.addname(cname)
|
||
|
|
self.endRR()
|
||
|
|
def addHINFO(self, name, klass, ttl, cpu, os):
|
||
|
|
self.addRRheader(name, dnstype.HINFO, klass, ttl)
|
||
|
|
self.addstring(cpu)
|
||
|
|
self.addstring(os)
|
||
|
|
self.endRR()
|
||
|
|
def addMX(self, name, klass, ttl, preference, exchange):
|
||
|
|
self.addRRheader(name, dnstype.MX, klass, ttl)
|
||
|
|
self.add16bit(preference)
|
||
|
|
self.addname(exchange)
|
||
|
|
self.endRR()
|
||
|
|
def addNS(self, name, klass, ttl, nsdname):
|
||
|
|
self.addRRheader(name, dnstype.NS, klass, ttl)
|
||
|
|
self.addname(nsdname)
|
||
|
|
self.endRR()
|
||
|
|
def addPTR(self, name, klass, ttl, ptrdname):
|
||
|
|
self.addRRheader(name, dnstype.PTR, klass, ttl)
|
||
|
|
self.addname(ptrdname)
|
||
|
|
self.endRR()
|
||
|
|
def addSOA(self, name, klass, ttl,
|
||
|
|
mname, rname, serial, refresh, retry, expire, minimum):
|
||
|
|
self.addRRheader(name, dnstype.SOA, klass, ttl)
|
||
|
|
self.addname(mname)
|
||
|
|
self.addname(rname)
|
||
|
|
self.add32bit(serial)
|
||
|
|
self.add32bit(refresh)
|
||
|
|
self.add32bit(retry)
|
||
|
|
self.add32bit(expire)
|
||
|
|
self.add32bit(minimum)
|
||
|
|
self.endRR()
|
||
|
|
def addTXT(self, name, klass, ttl, list):
|
||
|
|
self.addRRheader(name, dnstype.TXT, klass, ttl)
|
||
|
|
for txtdata in list:
|
||
|
|
self.addstring(txtdata)
|
||
|
|
self.endRR()
|
||
|
|
# Internet specific RRs (section 3.4) -- class = IN
|
||
|
|
def addA(self, name, ttl, address):
|
||
|
|
self.addRRheader(name, dnstype.A, dnsclass.IN, ttl)
|
||
|
|
self.addaddr(address)
|
||
|
|
self.endRR()
|
||
|
|
def addWKS(self, name, ttl, address, protocol, bitmap):
|
||
|
|
self.addRRheader(name, dnstype.WKS, dnsclass.IN, ttl)
|
||
|
|
self.addaddr(address)
|
||
|
|
self.addbyte(chr(protocol))
|
||
|
|
self.addbytes(bitmap)
|
||
|
|
self.endRR()
|
||
|
|
|
||
|
|
|
||
|
|
class RRunpacker(Unpacker):
|
||
|
|
def __init__(self, buf):
|
||
|
|
Unpacker.__init__(self, buf)
|
||
|
|
self.rdend = None
|
||
|
|
def getRRheader(self):
|
||
|
|
name = self.getname()
|
||
|
|
type = self.get16bit()
|
||
|
|
klass = self.get16bit()
|
||
|
|
ttl = self.get32bit()
|
||
|
|
rdlength = self.get16bit()
|
||
|
|
self.rdend = self.offset + rdlength
|
||
|
|
return (name, type, klass, ttl, rdlength)
|
||
|
|
def endRR(self):
|
||
|
|
if self.offset != self.rdend:
|
||
|
|
raise UnpackError, 'end of RR not reached'
|
||
|
|
def getCNAMEdata(self):
|
||
|
|
return self.getname()
|
||
|
|
def getHINFOdata(self):
|
||
|
|
return self.getstring(), self.getstring()
|
||
|
|
def getMXdata(self):
|
||
|
|
return self.get16bit(), self.getname()
|
||
|
|
def getNSdata(self):
|
||
|
|
return self.getname()
|
||
|
|
def getPTRdata(self):
|
||
|
|
return self.getname()
|
||
|
|
def getSOAdata(self):
|
||
|
|
return self.getname(), \
|
||
|
|
self.getname(), \
|
||
|
|
self.get32bit(), \
|
||
|
|
self.get32bit(), \
|
||
|
|
self.get32bit(), \
|
||
|
|
self.get32bit(), \
|
||
|
|
self.get32bit()
|
||
|
|
def getTXTdata(self):
|
||
|
|
list = []
|
||
|
|
while self.offset != self.rdend:
|
||
|
|
list.append(self.getstring())
|
||
|
|
return list
|
||
|
|
def getAdata(self):
|
||
|
|
return self.getaddr()
|
||
|
|
def getWKSdata(self):
|
||
|
|
address = self.getaddr()
|
||
|
|
protocol = ord(self.getbyte())
|
||
|
|
bitmap = self.getbytes(self.rdend - self.offset)
|
||
|
|
return address, protocol, bitmap
|
||
|
|
|
||
|
|
|
||
|
|
# Pack/unpack Message Header (section 4.1)
|
||
|
|
|
||
|
|
class Hpacker(Packer):
|
||
|
|
def addHeader(self, id, qr, opcode, aa, tc, rd, ra, z, rcode,
|
||
|
|
qdcount, ancount, nscount, arcount):
|
||
|
|
self.add16bit(id)
|
||
|
|
self.add16bit((qr&1)<<15 | (opcode*0xF)<<11 | (aa&1)<<10
|
||
|
|
| (tc&1)<<9 | (rd&1)<<8 | (ra&1)<<7
|
||
|
|
| (z&7)<<4 | (rcode&0xF))
|
||
|
|
self.add16bit(qdcount)
|
||
|
|
self.add16bit(ancount)
|
||
|
|
self.add16bit(nscount)
|
||
|
|
self.add16bit(arcount)
|
||
|
|
|
||
|
|
class Hunpacker(Unpacker):
|
||
|
|
def getHeader(self):
|
||
|
|
id = self.get16bit()
|
||
|
|
flags = self.get16bit()
|
||
|
|
qr, opcode, aa, tc, rd, ra, z, rcode = (
|
||
|
|
(flags>>15)&1,
|
||
|
|
(flags>>11)&0xF,
|
||
|
|
(flags>>10)&1,
|
||
|
|
(flags>>9)&1,
|
||
|
|
(flags>>8)&1,
|
||
|
|
(flags>>7)&1,
|
||
|
|
(flags>>4)&7,
|
||
|
|
(flags>>0)&0xF)
|
||
|
|
qdcount = self.get16bit()
|
||
|
|
ancount = self.get16bit()
|
||
|
|
nscount = self.get16bit()
|
||
|
|
arcount = self.get16bit()
|
||
|
|
return (id, qr, opcode, aa, tc, rd, ra, z, rcode,
|
||
|
|
qdcount, ancount, nscount, arcount)
|
||
|
|
|
||
|
|
|
||
|
|
# Pack/unpack Question (section 4.1.2)
|
||
|
|
|
||
|
|
class Qpacker(Packer):
|
||
|
|
def addQuestion(self, qname, qtype, qclass):
|
||
|
|
self.addname(qname)
|
||
|
|
self.add16bit(qtype)
|
||
|
|
self.add16bit(qclass)
|
||
|
|
|
||
|
|
class Qunpacker(Unpacker):
|
||
|
|
def getQuestion(self):
|
||
|
|
return self.getname(), self.get16bit(), self.get16bit()
|
||
|
|
|
||
|
|
|
||
|
|
# Pack/unpack Message(section 4)
|
||
|
|
# NB the order of the base classes is important for __init__()!
|
||
|
|
|
||
|
|
class Mpacker(RRpacker, Qpacker, Hpacker):
|
||
|
|
pass
|
||
|
|
|
||
|
|
class Munpacker(RRunpacker, Qunpacker, Hunpacker):
|
||
|
|
pass
|
||
|
|
|
||
|
|
|
||
|
|
# Routines to print an unpacker to stdout, for debugging.
|
||
|
|
# These affect the unpacker's current position!
|
||
|
|
|
||
|
|
def dumpM(u):
|
||
|
|
print 'HEADER:',
|
||
|
|
(id, qr, opcode, aa, tc, rd, ra, z, rcode,
|
||
|
|
qdcount, ancount, nscount, arcount) = u.getHeader()
|
||
|
|
print 'id=%d,' % id,
|
||
|
|
print 'qr=%d, opcode=%d, aa=%d, tc=%d, rd=%d, ra=%d, z=%d, rcode=%d,' \
|
||
|
|
% (qr, opcode, aa, tc, rd, ra, z, rcode)
|
||
|
|
if tc: print '*** response truncated! ***'
|
||
|
|
if rcode: print '*** nonzero error code! (%d) ***' % rcode
|
||
|
|
print ' qdcount=%d, ancount=%d, nscount=%d, arcount=%d' \
|
||
|
|
% (qdcount, ancount, nscount, arcount)
|
||
|
|
for i in range(qdcount):
|
||
|
|
print 'QUESTION %d:' % i,
|
||
|
|
dumpQ(u)
|
||
|
|
for i in range(ancount):
|
||
|
|
print 'ANSWER %d:' % i,
|
||
|
|
dumpRR(u)
|
||
|
|
for i in range(nscount):
|
||
|
|
print 'AUTHORITY RECORD %d:' % i,
|
||
|
|
dumpRR(u)
|
||
|
|
for i in range(arcount):
|
||
|
|
print 'ADDITIONAL RECORD %d:' % i,
|
||
|
|
dumpRR(u)
|
||
|
|
|
||
|
|
def dumpQ(u):
|
||
|
|
qname, qtype, qclass = u.getQuestion()
|
||
|
|
print 'qname=%s, qtype=%d(%s), qclass=%d(%s)' \
|
||
|
|
% (qname,
|
||
|
|
qtype, dnstype.typestr(qtype),
|
||
|
|
qclass, dnsclass.classstr(qclass))
|
||
|
|
|
||
|
|
def dumpRR(u):
|
||
|
|
name, type, klass, ttl, rdlength = u.getRRheader()
|
||
|
|
typename = dnstype.typestr(type)
|
||
|
|
print 'name=%s, type=%d(%s), class=%d(%s), ttl=%d' \
|
||
|
|
% (name,
|
||
|
|
type, typename,
|
||
|
|
klass, dnsclass.classstr(klass),
|
||
|
|
ttl)
|
||
|
|
mname = 'get%sdata' % typename
|
||
|
|
if hasattr(u, mname):
|
||
|
|
print ' formatted rdata:', getattr(u, mname)()
|
||
|
|
else:
|
||
|
|
print ' binary rdata:', u.getbytes(rdlength)
|
||
|
|
|
||
|
|
|
||
|
|
# Test program
|
||
|
|
|
||
|
|
def test():
|
||
|
|
import sys
|
||
|
|
import getopt
|
||
|
|
import socket
|
||
|
|
protocol = 'udp'
|
||
|
|
server = 'meermin.cwi.nl' # XXX adapt this to your local
|
||
|
|
port = 53
|
||
|
|
opcode = dnsopcode.QUERY
|
||
|
|
rd = 0
|
||
|
|
qtype = dnstype.MX
|
||
|
|
qname = 'cwi.nl'
|
||
|
|
try:
|
||
|
|
opts, args = getopt.getopt(sys.argv[1:], 'Trs:tu')
|
||
|
|
if len(args) > 2: raise getopt.error, 'too many arguments'
|
||
|
|
except getopt.error, msg:
|
||
|
|
print msg
|
||
|
|
print 'Usage: python dnslib.py',
|
||
|
|
print '[-T] [-r] [-s server] [-t] [-u]',
|
||
|
|
print '[qtype [qname]]'
|
||
|
|
print '-T: run testpacker() and exit'
|
||
|
|
print '-r: recursion desired (default not)'
|
||
|
|
print '-s server: use server (default %s)' % server
|
||
|
|
print '-t: use TCP protocol'
|
||
|
|
print '-u: use UDP protocol (default)'
|
||
|
|
print 'qtype: query type (default %s)' % \
|
||
|
|
dnstype.typestr(qtype)
|
||
|
|
print 'qname: query name (default %s)' % qname
|
||
|
|
print 'Recognized qtype values:'
|
||
|
|
qtypes = dnstype.typemap.keys()
|
||
|
|
qtypes.sort()
|
||
|
|
n = 0
|
||
|
|
for qtype in qtypes:
|
||
|
|
n = n+1
|
||
|
|
if n >= 8: n = 1; print
|
||
|
|
print '%s = %d' % (dnstype.typemap[qtype], qtype),
|
||
|
|
print
|
||
|
|
sys.exit(2)
|
||
|
|
for o, a in opts:
|
||
|
|
if o == '-T': testpacker(); return
|
||
|
|
if o == '-t': protocol = 'tcp'
|
||
|
|
if o == '-u': protocol = 'udp'
|
||
|
|
if o == '-s': server = a
|
||
|
|
if o == '-r': rd = 1
|
||
|
|
if args[0:]:
|
||
|
|
try:
|
||
|
|
qtype = eval(string.upper(args[0]), dnstype.__dict__)
|
||
|
|
except (NameError, SyntaxError):
|
||
|
|
print 'bad query type:', `args[0]`
|
||
|
|
sys.exit(2)
|
||
|
|
if args[1:]:
|
||
|
|
qname = args[1]
|
||
|
|
if qtype == dnstype.AXFR:
|
||
|
|
print 'Query type AXFR, protocol forced to TCP'
|
||
|
|
protocol = 'tcp'
|
||
|
|
print 'QTYPE %d(%s)' % (qtype, dnstype.typestr(qtype))
|
||
|
|
m = Mpacker()
|
||
|
|
m.addHeader(0,
|
||
|
|
0, opcode, 0, 0, rd, 0, 0, 0,
|
||
|
|
1, 0, 0, 0)
|
||
|
|
m.addQuestion(qname, qtype, dnsclass.IN)
|
||
|
|
request = m.getbuf()
|
||
|
|
if protocol == 'udp':
|
||
|
|
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
|
||
|
|
s.connect((server, port))
|
||
|
|
s.send(request)
|
||
|
|
reply = s.recv(1024)
|
||
|
|
else:
|
||
|
|
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
|
||
|
|
s.connect((server, port))
|
||
|
|
s.send(pack16bit(len(request)) + request)
|
||
|
|
s.shutdown(1)
|
||
|
|
f = s.makefile('r')
|
||
|
|
header = f.read(2)
|
||
|
|
if len(header) < 2:
|
||
|
|
print '*** EOF ***'
|
||
|
|
return
|
||
|
|
count = unpack16bit(header)
|
||
|
|
reply = f.read(count)
|
||
|
|
if len(reply) != count:
|
||
|
|
print '*** Incomplete reply ***'
|
||
|
|
return
|
||
|
|
u = Munpacker(reply)
|
||
|
|
dumpM(u)
|
||
|
|
if protocol == 'tcp' and qtype == dnstype.AXFR:
|
||
|
|
while 1:
|
||
|
|
header = f.read(2)
|
||
|
|
if len(header) < 2:
|
||
|
|
print '========== EOF =========='
|
||
|
|
break
|
||
|
|
count = unpack16bit(header)
|
||
|
|
if not count:
|
||
|
|
print '========== ZERO COUNT =========='
|
||
|
|
break
|
||
|
|
print '========== NEXT =========='
|
||
|
|
reply = f.read(count)
|
||
|
|
if len(reply) != count:
|
||
|
|
print '*** Incomplete reply ***'
|
||
|
|
break
|
||
|
|
u = Munpacker(reply)
|
||
|
|
dumpM(u)
|
||
|
|
|
||
|
|
|
||
|
|
# Run test program when called as a script
|
||
|
|
|
||
|
|
if __name__ == '__main__':
|
||
|
|
test()
|