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65 lines
2.4 KiB
65 lines
2.4 KiB
11 years ago
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#!/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 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 == 1:
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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 == 3:
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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 == 4:
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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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