add: initial AI support
This commit is contained in:
diSabler
693
lib/DNS/Lib.py
Normal file
693
lib/DNS/Lib.py
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@@ -0,0 +1,693 @@
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# -*- encoding: utf-8 -*-
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"""
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$Id: Lib.py,v 1.11.2.3 2007/05/22 20:27:40 customdesigned Exp $
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This file is part of the pydns project.
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Homepage: http://pydns.sourceforge.net
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This code is covered by the standard Python License.
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Library code. Largely this is packers and unpackers for various types.
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"""
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#
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#
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# See RFC 1035:
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# ------------------------------------------------------------------------
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# Network Working Group P. Mockapetris
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# Request for Comments: 1035 ISI
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# November 1987
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# Obsoletes: RFCs 882, 883, 973
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#
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# DOMAIN NAMES - IMPLEMENTATION AND SPECIFICATION
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# ------------------------------------------------------------------------
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import string, types
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import Type
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import Class
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import Opcode
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import Status
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from Base import DNSError
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class UnpackError(DNSError): pass
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class PackError(DNSError): pass
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# Low-level 16 and 32 bit integer packing and unpacking
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from struct import pack as struct_pack
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from struct import unpack as struct_unpack
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from socket import inet_ntoa, inet_aton
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def pack16bit(n):
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return struct_pack('!H', n)
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def pack32bit(n):
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return struct_pack('!L', n)
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def unpack16bit(s):
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return struct_unpack('!H', s)[0]
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def unpack32bit(s):
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return struct_unpack('!L', s)[0]
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def addr2bin(addr):
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return struct_unpack('!l', inet_aton(addr))[0]
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def bin2addr(n):
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return inet_ntoa(struct_pack('!L', n))
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# Packing class
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class Packer:
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" packer base class. supports basic byte/16bit/32bit/addr/string/name "
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def __init__(self):
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self.buf = ''
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self.index = {}
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def getbuf(self):
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return self.buf
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def addbyte(self, c):
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if len(c) != 1: raise TypeError, 'one character expected'
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self.buf = self.buf + c
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def addbytes(self, bytes):
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self.buf = self.buf + bytes
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def add16bit(self, n):
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self.buf = self.buf + pack16bit(n)
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def add32bit(self, n):
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self.buf = self.buf + pack32bit(n)
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def addaddr(self, addr):
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n = addr2bin(addr)
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self.buf = self.buf + pack32bit(n)
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def addstring(self, s):
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if len(s) > 255:
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raise ValueError, "Can't encode string of length "+ \
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"%s (> 255)"%(len(s))
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self.addbyte(chr(len(s)))
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self.addbytes(s)
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def addname(self, name):
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# Domain name packing (section 4.1.4)
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# Add a domain name to the buffer, possibly using pointers.
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# The case of the first occurrence of a name is preserved.
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# Redundant dots are ignored.
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list = []
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for label in string.splitfields(name, '.'):
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if label:
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label = label.encode('utf8')
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if len(label) > 63:
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raise PackError, 'label too long'
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list.append(label)
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keys = []
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for i in range(len(list)):
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key = string.upper(string.joinfields(list[i:], '.'))
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keys.append(key)
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if self.index.has_key(key):
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pointer = self.index[key]
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break
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else:
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i = len(list)
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pointer = None
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# Do it into temporaries first so exceptions don't
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# mess up self.index and self.buf
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buf = ''
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offset = len(self.buf)
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index = []
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for j in range(i):
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label = list[j]
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n = len(label)
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if offset + len(buf) < 0x3FFF:
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index.append((keys[j], offset + len(buf)))
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else:
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print 'DNS.Lib.Packer.addname:',
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print 'warning: pointer too big'
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buf = buf + (chr(n) + label)
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if pointer:
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buf = buf + pack16bit(pointer | 0xC000)
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else:
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buf = buf + '\0'
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self.buf = self.buf + buf
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for key, value in index:
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self.index[key] = value
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def dump(self):
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keys = self.index.keys()
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keys.sort()
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print '-'*40
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for key in keys:
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print '%20s %3d' % (key, self.index[key])
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print '-'*40
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space = 1
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for i in range(0, len(self.buf)+1, 2):
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if self.buf[i:i+2] == '**':
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if not space: print
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space = 1
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continue
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space = 0
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print '%4d' % i,
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for c in self.buf[i:i+2]:
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if ' ' < c < '\177':
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print ' %c' % c,
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else:
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print '%2d' % ord(c),
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print
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print '-'*40
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# Unpacking class
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class Unpacker:
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def __init__(self, buf):
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self.buf = buf
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self.offset = 0
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def getbyte(self):
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if self.offset >= len(self.buf):
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raise UnpackError, "Ran off end of data"
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c = self.buf[self.offset]
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self.offset = self.offset + 1
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return c
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def getbytes(self, n):
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s = self.buf[self.offset : self.offset + n]
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if len(s) != n: raise UnpackError, 'not enough data left'
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self.offset = self.offset + n
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return s
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def get16bit(self):
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return unpack16bit(self.getbytes(2))
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def get32bit(self):
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return unpack32bit(self.getbytes(4))
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def getaddr(self):
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return bin2addr(self.get32bit())
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def getstring(self):
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return self.getbytes(ord(self.getbyte()))
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def getname(self):
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# Domain name unpacking (section 4.1.4)
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c = self.getbyte()
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i = ord(c)
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if i & 0xC0 == 0xC0:
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d = self.getbyte()
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j = ord(d)
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pointer = ((i<<8) | j) & ~0xC000
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save_offset = self.offset
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try:
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self.offset = pointer
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domain = self.getname()
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finally:
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self.offset = save_offset
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return domain
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if i == 0:
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return ''
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domain = self.getbytes(i)
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remains = self.getname()
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if not remains:
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return domain
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else:
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return domain + '.' + remains
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# Test program for packin/unpacking (section 4.1.4)
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def testpacker():
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N = 2500
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R = range(N)
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import timing
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# See section 4.1.4 of RFC 1035
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timing.start()
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for i in R:
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p = Packer()
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p.addaddr('192.168.0.1')
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p.addbytes('*' * 20)
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p.addname('f.ISI.ARPA')
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p.addbytes('*' * 8)
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p.addname('Foo.F.isi.arpa')
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p.addbytes('*' * 18)
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p.addname('arpa')
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p.addbytes('*' * 26)
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p.addname('')
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timing.finish()
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print timing.milli(), "ms total for packing"
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print round(timing.milli() / i, 4), 'ms per packing'
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#p.dump()
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u = Unpacker(p.buf)
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u.getaddr()
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u.getbytes(20)
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u.getname()
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u.getbytes(8)
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u.getname()
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u.getbytes(18)
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u.getname()
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u.getbytes(26)
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u.getname()
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timing.start()
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for i in R:
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u = Unpacker(p.buf)
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res = (u.getaddr(),
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u.getbytes(20),
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u.getname(),
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u.getbytes(8),
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u.getname(),
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u.getbytes(18),
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u.getname(),
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u.getbytes(26),
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u.getname())
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timing.finish()
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print timing.milli(), "ms total for unpacking"
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print round(timing.milli() / i, 4), 'ms per unpacking'
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#for item in res: print item
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# Pack/unpack RR toplevel format (section 3.2.1)
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class RRpacker(Packer):
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def __init__(self):
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Packer.__init__(self)
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self.rdstart = None
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def addRRheader(self, name, type, klass, ttl, *rest):
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self.addname(name)
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self.add16bit(type)
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self.add16bit(klass)
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self.add32bit(ttl)
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if rest:
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if rest[1:]: raise TypeError, 'too many args'
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rdlength = rest[0]
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else:
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rdlength = 0
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self.add16bit(rdlength)
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self.rdstart = len(self.buf)
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def patchrdlength(self):
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rdlength = unpack16bit(self.buf[self.rdstart-2:self.rdstart])
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if rdlength == len(self.buf) - self.rdstart:
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return
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rdata = self.buf[self.rdstart:]
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save_buf = self.buf
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ok = 0
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try:
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self.buf = self.buf[:self.rdstart-2]
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self.add16bit(len(rdata))
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self.buf = self.buf + rdata
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ok = 1
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finally:
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if not ok: self.buf = save_buf
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def endRR(self):
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if self.rdstart is not None:
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self.patchrdlength()
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self.rdstart = None
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def getbuf(self):
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if self.rdstart is not None: self.patchrdlength()
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return Packer.getbuf(self)
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# Standard RRs (section 3.3)
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def addCNAME(self, name, klass, ttl, cname):
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self.addRRheader(name, Type.CNAME, klass, ttl)
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self.addname(cname)
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self.endRR()
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def addHINFO(self, name, klass, ttl, cpu, os):
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self.addRRheader(name, Type.HINFO, klass, ttl)
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self.addstring(cpu)
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self.addstring(os)
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self.endRR()
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def addMX(self, name, klass, ttl, preference, exchange):
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self.addRRheader(name, Type.MX, klass, ttl)
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self.add16bit(preference)
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self.addname(exchange)
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self.endRR()
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def addNS(self, name, klass, ttl, nsdname):
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self.addRRheader(name, Type.NS, klass, ttl)
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self.addname(nsdname)
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self.endRR()
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def addPTR(self, name, klass, ttl, ptrdname):
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self.addRRheader(name, Type.PTR, klass, ttl)
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self.addname(ptrdname)
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self.endRR()
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def addSOA(self, name, klass, ttl,
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mname, rname, serial, refresh, retry, expire, minimum):
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self.addRRheader(name, Type.SOA, klass, ttl)
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self.addname(mname)
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self.addname(rname)
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self.add32bit(serial)
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self.add32bit(refresh)
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self.add32bit(retry)
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self.add32bit(expire)
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self.add32bit(minimum)
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self.endRR()
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def addTXT(self, name, klass, ttl, list):
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self.addRRheader(name, Type.TXT, klass, ttl)
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if type(list) is types.StringType:
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list = [list]
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for txtdata in list:
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self.addstring(txtdata)
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self.endRR()
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# Internet specific RRs (section 3.4) -- class = IN
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def addA(self, name, klass, ttl, address):
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self.addRRheader(name, Type.A, klass, ttl)
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self.addaddr(address)
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self.endRR()
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def addWKS(self, name, ttl, address, protocol, bitmap):
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self.addRRheader(name, Type.WKS, Class.IN, ttl)
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self.addaddr(address)
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self.addbyte(chr(protocol))
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self.addbytes(bitmap)
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self.endRR()
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def addSRV(self):
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raise NotImplementedError
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def prettyTime(seconds):
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if seconds<60:
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return seconds,"%d seconds"%(seconds)
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if seconds<3600:
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return seconds,"%d minutes"%(seconds/60)
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if seconds<86400:
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return seconds,"%d hours"%(seconds/3600)
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if seconds<604800:
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return seconds,"%d days"%(seconds/86400)
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else:
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return seconds,"%d weeks"%(seconds/604800)
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class RRunpacker(Unpacker):
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def __init__(self, buf):
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Unpacker.__init__(self, buf)
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self.rdend = None
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def getRRheader(self):
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name = self.getname()
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rrtype = self.get16bit()
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klass = self.get16bit()
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ttl = self.get32bit()
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rdlength = self.get16bit()
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self.rdend = self.offset + rdlength
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return (name, rrtype, klass, ttl, rdlength)
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def endRR(self):
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if self.offset != self.rdend:
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raise UnpackError, 'end of RR not reached'
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def getCNAMEdata(self):
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return self.getname()
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def getHINFOdata(self):
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return self.getstring(), self.getstring()
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def getMXdata(self):
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return self.get16bit(), self.getname()
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def getNSdata(self):
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return self.getname()
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def getPTRdata(self):
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return self.getname()
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def getSOAdata(self):
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return self.getname(), \
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self.getname(), \
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('serial',)+(self.get32bit(),), \
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('refresh ',)+prettyTime(self.get32bit()), \
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('retry',)+prettyTime(self.get32bit()), \
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('expire',)+prettyTime(self.get32bit()), \
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('minimum',)+prettyTime(self.get32bit())
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def getTXTdata(self):
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list = []
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while self.offset != self.rdend:
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list.append(self.getstring())
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return list
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def getAdata(self):
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return self.getaddr()
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def getWKSdata(self):
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address = self.getaddr()
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protocol = ord(self.getbyte())
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bitmap = self.getbytes(self.rdend - self.offset)
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return address, protocol, bitmap
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def getSRVdata(self):
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"""
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_Service._Proto.Name TTL Class SRV Priority Weight Port Target
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"""
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priority = self.get16bit()
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weight = self.get16bit()
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port = self.get16bit()
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target = self.getname()
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#print '***priority, weight, port, target', priority, weight, port, target
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return priority, weight, port, target
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# Pack/unpack Message Header (section 4.1)
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class Hpacker(Packer):
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def addHeader(self, id, qr, opcode, aa, tc, rd, ra, z, rcode,
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qdcount, ancount, nscount, arcount):
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self.add16bit(id)
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self.add16bit((qr&1)<<15 | (opcode&0xF)<<11 | (aa&1)<<10
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| (tc&1)<<9 | (rd&1)<<8 | (ra&1)<<7
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||||
| (z&7)<<4 | (rcode&0xF))
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self.add16bit(qdcount)
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self.add16bit(ancount)
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self.add16bit(nscount)
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self.add16bit(arcount)
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class Hunpacker(Unpacker):
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def getHeader(self):
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id = self.get16bit()
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flags = self.get16bit()
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||||
qr, opcode, aa, tc, rd, ra, z, rcode = (
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(flags>>15)&1,
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(flags>>11)&0xF,
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(flags>>10)&1,
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||||
(flags>>9)&1,
|
||||
(flags>>8)&1,
|
||||
(flags>>7)&1,
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||||
(flags>>4)&7,
|
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(flags>>0)&0xF)
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||||
qdcount = self.get16bit()
|
||||
ancount = self.get16bit()
|
||||
nscount = self.get16bit()
|
||||
arcount = self.get16bit()
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||||
return (id, qr, opcode, aa, tc, rd, ra, z, rcode,
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||||
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):
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||||
def getQuestion(self):
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||||
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)
|
||||
|
||||
class DnsResult:
|
||||
|
||||
def __init__(self,u,args):
|
||||
self.header={}
|
||||
self.questions=[]
|
||||
self.answers=[]
|
||||
self.authority=[]
|
||||
self.additional=[]
|
||||
self.args=args
|
||||
self.storeM(u)
|
||||
|
||||
def show(self):
|
||||
import time
|
||||
print '; <<>> PDG.py 1.0 <<>> %s %s'%(self.args['name'],
|
||||
self.args['qtype'])
|
||||
opt=""
|
||||
if self.args['rd']:
|
||||
opt=opt+'recurs '
|
||||
h=self.header
|
||||
print ';; options: '+opt
|
||||
print ';; got answer:'
|
||||
print ';; ->>HEADER<<- opcode %s, status %s, id %d'%(
|
||||
h['opcode'],h['status'],h['id'])
|
||||
flags=filter(lambda x,h=h:h[x],('qr','aa','rd','ra','tc'))
|
||||
print ';; flags: %s; Ques: %d, Ans: %d, Auth: %d, Addit: %d'%(
|
||||
string.join(flags),h['qdcount'],h['ancount'],h['nscount'],
|
||||
h['arcount'])
|
||||
print ';; QUESTIONS:'
|
||||
for q in self.questions:
|
||||
print ';; %s, type = %s, class = %s'%(q['qname'],q['qtypestr'],
|
||||
q['qclassstr'])
|
||||
print
|
||||
print ';; ANSWERS:'
|
||||
for a in self.answers:
|
||||
print '%-20s %-6s %-6s %s'%(a['name'],`a['ttl']`,a['typename'],
|
||||
a['data'])
|
||||
print
|
||||
print ';; AUTHORITY RECORDS:'
|
||||
for a in self.authority:
|
||||
print '%-20s %-6s %-6s %s'%(a['name'],`a['ttl']`,a['typename'],
|
||||
a['data'])
|
||||
print
|
||||
print ';; ADDITIONAL RECORDS:'
|
||||
for a in self.additional:
|
||||
print '%-20s %-6s %-6s %s'%(a['name'],`a['ttl']`,a['typename'],
|
||||
a['data'])
|
||||
print
|
||||
if self.args.has_key('elapsed'):
|
||||
print ';; Total query time: %d msec'%self.args['elapsed']
|
||||
print ';; To SERVER: %s'%(self.args['server'])
|
||||
print ';; WHEN: %s'%time.ctime(time.time())
|
||||
|
||||
def storeM(self,u):
|
||||
(self.header['id'], self.header['qr'], self.header['opcode'],
|
||||
self.header['aa'], self.header['tc'], self.header['rd'],
|
||||
self.header['ra'], self.header['z'], self.header['rcode'],
|
||||
self.header['qdcount'], self.header['ancount'],
|
||||
self.header['nscount'], self.header['arcount']) = u.getHeader()
|
||||
self.header['opcodestr']=Opcode.opcodestr(self.header['opcode'])
|
||||
self.header['status']=Status.statusstr(self.header['rcode'])
|
||||
for i in range(self.header['qdcount']):
|
||||
#print 'QUESTION %d:' % i,
|
||||
self.questions.append(self.storeQ(u))
|
||||
for i in range(self.header['ancount']):
|
||||
#print 'ANSWER %d:' % i,
|
||||
self.answers.append(self.storeRR(u))
|
||||
for i in range(self.header['nscount']):
|
||||
#print 'AUTHORITY RECORD %d:' % i,
|
||||
self.authority.append(self.storeRR(u))
|
||||
for i in range(self.header['arcount']):
|
||||
#print 'ADDITIONAL RECORD %d:' % i,
|
||||
self.additional.append(self.storeRR(u))
|
||||
|
||||
def storeQ(self,u):
|
||||
q={}
|
||||
q['qname'], q['qtype'], q['qclass'] = u.getQuestion()
|
||||
q['qtypestr']=Type.typestr(q['qtype'])
|
||||
q['qclassstr']=Class.classstr(q['qclass'])
|
||||
return q
|
||||
|
||||
def storeRR(self,u):
|
||||
r={}
|
||||
r['name'],r['type'],r['class'],r['ttl'],r['rdlength'] = u.getRRheader()
|
||||
r['typename'] = Type.typestr(r['type'])
|
||||
r['classstr'] = Class.classstr(r['class'])
|
||||
#print 'name=%s, type=%d(%s), class=%d(%s), ttl=%d' \
|
||||
# % (name,
|
||||
# type, typename,
|
||||
# klass, Class.classstr(class),
|
||||
# ttl)
|
||||
mname = 'get%sdata' % r['typename']
|
||||
if hasattr(u, mname):
|
||||
r['data']=getattr(u, mname)()
|
||||
else:
|
||||
r['data']=u.getbytes(r['rdlength'])
|
||||
return r
|
||||
|
||||
def dumpQ(u):
|
||||
qname, qtype, qclass = u.getQuestion()
|
||||
print 'qname=%s, qtype=%d(%s), qclass=%d(%s)' \
|
||||
% (qname,
|
||||
qtype, Type.typestr(qtype),
|
||||
qclass, Class.classstr(qclass))
|
||||
|
||||
def dumpRR(u):
|
||||
name, type, klass, ttl, rdlength = u.getRRheader()
|
||||
typename = Type.typestr(type)
|
||||
print 'name=%s, type=%d(%s), class=%d(%s), ttl=%d' \
|
||||
% (name,
|
||||
type, typename,
|
||||
klass, Class.classstr(klass),
|
||||
ttl)
|
||||
mname = 'get%sdata' % typename
|
||||
if hasattr(u, mname):
|
||||
print ' formatted rdata:', getattr(u, mname)()
|
||||
else:
|
||||
print ' binary rdata:', u.getbytes(rdlength)
|
||||
|
||||
if __name__ == "__main__":
|
||||
testpacker()
|
||||
#
|
||||
# $Log: Lib.py,v $
|
||||
# Revision 1.11.2.3 2007/05/22 20:27:40 customdesigned
|
||||
# Fix unpacker underflow.
|
||||
#
|
||||
# Revision 1.11.2.2 2007/05/22 20:25:53 customdesigned
|
||||
# Use socket.inetntoa,inetaton.
|
||||
#
|
||||
# Revision 1.11.2.1 2007/05/22 20:20:39 customdesigned
|
||||
# Mark utf-8 encoding
|
||||
#
|
||||
# Revision 1.11 2002/03/19 13:05:02 anthonybaxter
|
||||
# converted to class based exceptions (there goes the python1.4 compatibility :)
|
||||
#
|
||||
# removed a quite gross use of 'eval()'.
|
||||
#
|
||||
# Revision 1.10 2002/03/19 12:41:33 anthonybaxter
|
||||
# tabnannied and reindented everything. 4 space indent, no tabs.
|
||||
# yay.
|
||||
#
|
||||
# Revision 1.9 2002/03/19 10:30:33 anthonybaxter
|
||||
# first round of major bits and pieces. The major stuff here (summarised
|
||||
# from my local, off-net CVS server :/ this will cause some oddities with
|
||||
# the
|
||||
#
|
||||
# tests/testPackers.py:
|
||||
# a large slab of unit tests for the packer and unpacker code in DNS.Lib
|
||||
#
|
||||
# DNS/Lib.py:
|
||||
# placeholder for addSRV.
|
||||
# added 'klass' to addA, make it the same as the other A* records.
|
||||
# made addTXT check for being passed a string, turn it into a length 1 list.
|
||||
# explicitly check for adding a string of length > 255 (prohibited).
|
||||
# a bunch of cleanups from a first pass with pychecker
|
||||
# new code for pack/unpack. the bitwise stuff uses struct, for a smallish
|
||||
# (disappointly small, actually) improvement, while addr2bin is much
|
||||
# much faster now.
|
||||
#
|
||||
# DNS/Base.py:
|
||||
# added DiscoverNameServers. This automatically does the right thing
|
||||
# on unix/ win32. No idea how MacOS handles this. *sigh*
|
||||
# Incompatible change: Don't use ParseResolvConf on non-unix, use this
|
||||
# function, instead!
|
||||
# a bunch of cleanups from a first pass with pychecker
|
||||
#
|
||||
# Revision 1.8 2001/08/09 09:08:55 anthonybaxter
|
||||
# added identifying header to top of each file
|
||||
#
|
||||
# Revision 1.7 2001/07/19 07:50:44 anthony
|
||||
# Added SRV (RFC 2782) support. Code from Michael Str�der.
|
||||
#
|
||||
# Revision 1.6 2001/07/19 07:39:18 anthony
|
||||
# 'type' -> 'rrtype' in getRRheader(). Fix from Michael Str�der.
|
||||
#
|
||||
# Revision 1.5 2001/07/19 07:34:19 anthony
|
||||
# oops. glitch in storeRR (fixed now).
|
||||
# Reported by Bastian Kleineidam and by greg lin.
|
||||
#
|
||||
# Revision 1.4 2001/07/19 07:16:42 anthony
|
||||
# Changed (opcode&0xF)<<11 to (opcode*0xF)<<11.
|
||||
# Patch from Timothy J. Miller.
|
||||
#
|
||||
# Revision 1.3 2001/07/19 06:57:07 anthony
|
||||
# cvs keywords added
|
||||
#
|
||||
#
|
||||
Reference in New Issue
Block a user