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113 lines
3.9 KiB
113 lines
3.9 KiB
#!/usr/bin/python
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# -*- coding: utf-8 -*-
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# Copyright (c) 2014 clowwindy
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in
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# all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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# SOFTWARE.
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import socket
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import struct
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import logging
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def inet_ntop(family, ipstr):
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if family == socket.AF_INET:
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return socket.inet_ntoa(ipstr)
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elif family == socket.AF_INET6:
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v6addr = ':'.join(('%02X%02X' % (ord(i), ord(j)))
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for i, j in zip(ipstr[::2], ipstr[1::2]))
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return v6addr
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def inet_pton(family, addr):
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if family == socket.AF_INET:
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return socket.inet_aton(addr)
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elif family == socket.AF_INET6:
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if '.' in addr: # a v4 addr
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v4addr = addr[addr.rindex(':') + 1:]
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v4addr = socket.inet_aton(v4addr)
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v4addr = map(lambda x: ('%02X' % ord(x)), v4addr)
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v4addr.insert(2, ':')
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newaddr = addr[:addr.rindex(':') + 1] + ''.join(v4addr)
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return inet_pton(family, newaddr)
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dbyts = [0] * 8 # 8 groups
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grps = addr.split(':')
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for i, v in enumerate(grps):
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if v:
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dbyts[i] = int(v, 16)
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else:
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for j, w in enumerate(grps[::-1]):
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if w:
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dbyts[7 - j] = int(w, 16)
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else:
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break
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break
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return ''.join((chr(i // 256) + chr(i % 256)) for i in dbyts)
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else:
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raise RuntimeError("What family?")
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if not hasattr(socket, 'inet_pton'):
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socket.inet_pton = inet_pton
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if not hasattr(socket, 'inet_ntop'):
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socket.inet_ntop = inet_ntop
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ADDRTYPE_IPV4 = 1
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ADDRTYPE_IPV6 = 4
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ADDRTYPE_HOST = 3
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def parse_header(data):
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addrtype = ord(data[0])
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dest_addr = None
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dest_port = None
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header_length = 0
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if addrtype == ADDRTYPE_IPV4:
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if len(data) >= 7:
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dest_addr = socket.inet_ntoa(data[1:5])
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dest_port = struct.unpack('>H', data[5:7])[0]
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header_length = 7
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else:
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logging.warn('header is too short')
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elif addrtype == ADDRTYPE_HOST:
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if len(data) > 2:
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addrlen = ord(data[1])
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if len(data) >= 2 + addrlen:
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dest_addr = data[2:2 + addrlen]
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dest_port = struct.unpack('>H', data[2 + addrlen:4 +
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addrlen])[0]
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header_length = 4 + addrlen
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else:
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logging.warn('header is too short')
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else:
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logging.warn('header is too short')
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elif addrtype == ADDRTYPE_IPV6:
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if len(data) >= 19:
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dest_addr = socket.inet_ntop(socket.AF_INET6, data[1:17])
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dest_port = struct.unpack('>H', data[17:19])[0]
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header_length = 19
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else:
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logging.warn('header is too short')
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else:
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logging.warn('unsupported addrtype %d, maybe wrong password' % addrtype)
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if dest_addr is None:
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return None
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return addrtype, dest_addr, dest_port, header_length
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