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#!/usr/bin/env python
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"""
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Copyright (c) 2006-2024 sqlmap developers (https://sqlmap.org/)
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See the file 'LICENSE' for copying permission
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"""
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from __future__ import division
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import binascii
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import functools
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import math
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import os
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import random
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import re
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import sys
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import time
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import uuid
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class WichmannHill(random.Random):
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"""
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Reference: https://svn.python.org/projects/python/trunk/Lib/random.py
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"""
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VERSION = 1 # used by getstate/setstate
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def seed(self, a=None):
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"""Initialize internal state from hashable object.
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None or no argument seeds from current time or from an operating
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system specific randomness source if available.
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If a is not None or an int or long, hash(a) is used instead.
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If a is an int or long, a is used directly. Distinct values between
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0 and 27814431486575L inclusive are guaranteed to yield distinct
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internal states (this guarantee is specific to the default
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Wichmann-Hill generator).
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"""
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if a is None:
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try:
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a = int(binascii.hexlify(os.urandom(16)), 16)
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except NotImplementedError:
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a = int(time.time() * 256) # use fractional seconds
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if not isinstance(a, int):
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a = hash(a)
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a, x = divmod(a, 30268)
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a, y = divmod(a, 30306)
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a, z = divmod(a, 30322)
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self._seed = int(x) + 1, int(y) + 1, int(z) + 1
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self.gauss_next = None
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def random(self):
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"""Get the next random number in the range [0.0, 1.0)."""
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# Wichman-Hill random number generator.
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#
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# Wichmann, B. A. & Hill, I. D. (1982)
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# Algorithm AS 183:
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# An efficient and portable pseudo-random number generator
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# Applied Statistics 31 (1982) 188-190
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#
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# see also:
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# Correction to Algorithm AS 183
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# Applied Statistics 33 (1984) 123
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#
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# McLeod, A. I. (1985)
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# A remark on Algorithm AS 183
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# Applied Statistics 34 (1985),198-200
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# This part is thread-unsafe:
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# BEGIN CRITICAL SECTION
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x, y, z = self._seed
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x = (171 * x) % 30269
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y = (172 * y) % 30307
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z = (170 * z) % 30323
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self._seed = x, y, z
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# END CRITICAL SECTION
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# Note: on a platform using IEEE-754 double arithmetic, this can
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# never return 0.0 (asserted by Tim; proof too long for a comment).
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return (x / 30269.0 + y / 30307.0 + z / 30323.0) % 1.0
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def getstate(self):
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"""Return internal state; can be passed to setstate() later."""
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return self.VERSION, self._seed, self.gauss_next
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def setstate(self, state):
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"""Restore internal state from object returned by getstate()."""
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version = state[0]
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if version == 1:
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version, self._seed, self.gauss_next = state
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else:
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raise ValueError("state with version %s passed to "
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"Random.setstate() of version %s" %
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(version, self.VERSION))
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def jumpahead(self, n):
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"""Act as if n calls to random() were made, but quickly.
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n is an int, greater than or equal to 0.
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Example use: If you have 2 threads and know that each will
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consume no more than a million random numbers, create two Random
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objects r1 and r2, then do
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r2.setstate(r1.getstate())
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r2.jumpahead(1000000)
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Then r1 and r2 will use guaranteed-disjoint segments of the full
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period.
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"""
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if n < 0:
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raise ValueError("n must be >= 0")
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x, y, z = self._seed
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x = int(x * pow(171, n, 30269)) % 30269
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y = int(y * pow(172, n, 30307)) % 30307
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z = int(z * pow(170, n, 30323)) % 30323
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self._seed = x, y, z
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def __whseed(self, x=0, y=0, z=0):
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"""Set the Wichmann-Hill seed from (x, y, z).
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These must be integers in the range [0, 256).
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"""
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if not type(x) == type(y) == type(z) == int:
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raise TypeError('seeds must be integers')
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if not (0 <= x < 256 and 0 <= y < 256 and 0 <= z < 256):
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raise ValueError('seeds must be in range(0, 256)')
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if 0 == x == y == z:
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# Initialize from current time
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t = int(time.time() * 256)
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t = int((t & 0xffffff) ^ (t >> 24))
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t, x = divmod(t, 256)
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t, y = divmod(t, 256)
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t, z = divmod(t, 256)
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# Zero is a poor seed, so substitute 1
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self._seed = (x or 1, y or 1, z or 1)
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self.gauss_next = None
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def whseed(self, a=None):
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"""Seed from hashable object's hash code.
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None or no argument seeds from current time. It is not guaranteed
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that objects with distinct hash codes lead to distinct internal
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states.
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This is obsolete, provided for compatibility with the seed routine
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used prior to Python 2.1. Use the .seed() method instead.
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"""
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if a is None:
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self.__whseed()
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return
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a = hash(a)
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a, x = divmod(a, 256)
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a, y = divmod(a, 256)
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a, z = divmod(a, 256)
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x = (x + a) % 256 or 1
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y = (y + a) % 256 or 1
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z = (z + a) % 256 or 1
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self.__whseed(x, y, z)
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def patchHeaders(headers):
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# 如果headers不为空且没有headers属性
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if headers is not None and not hasattr(headers, "headers"):
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# 如果headers是字典类型
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if isinstance(headers, dict):
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# 定义一个类，继承自字典
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class _(dict):
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# 重写__getitem__方法，将key转换为小写后进行比较
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def __getitem__(self, key):
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for key_ in self:
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if key_.lower() == key.lower():
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return super(_, self).__getitem__(key_)
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raise KeyError(key)
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# 重写get方法，如果key不存在，返回默认值
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def get(self, key, default=None):
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try:
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return self[key]
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except KeyError:
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return default
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# 将headers转换为_类
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headers = _(headers)
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# 将headers转换为字符串列表
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headers.headers = ["%s: %s\r\n" % (header, headers[header]) for header in headers]
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return headers
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def cmp(a, b):
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"""
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>>> cmp("a", "b")
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-1
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>>> cmp(2, 1)
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1
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"""
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# 如果a小于b，返回-1
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if a < b:
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return -1
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# 如果a大于b，返回1
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elif a > b:
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return 1
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# 如果a等于b，返回0
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else:
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return 0
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# Reference: https://github.com/urllib3/urllib3/blob/master/src/urllib3/filepost.py
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def choose_boundary():
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"""
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>>> len(choose_boundary()) == 32
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True
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"""
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# 定义一个空字符串
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retval = ""
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# 尝试生成一个32位的随机字符串
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try:
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retval = uuid.uuid4().hex
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# 如果uuid模块不存在，则使用random模块生成32位的随机字符串
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except AttributeError:
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retval = "".join(random.sample("0123456789abcdef", 1)[0] for _ in xrange(32))
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# 返回生成的32位随机字符串
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return retval
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# Reference: http://python3porting.com/differences.html
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def round(x, d=0):
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"""
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>>> round(2.0)
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2.0
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>>> round(2.5)
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3.0
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"""
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p = 10 ** d
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if x > 0:
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return float(math.floor((x * p) + 0.5)) / p
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else:
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return float(math.ceil((x * p) - 0.5)) / p
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# Reference: https://code.activestate.com/recipes/576653-convert-a-cmp-function-to-a-key-function/
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def cmp_to_key(mycmp):
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"""Convert a cmp= function into a key= function"""
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class K(object):
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__slots__ = ['obj']
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def __init__(self, obj, *args):
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self.obj = obj
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def __lt__(self, other):
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"""小于号比较"""
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return mycmp(self.obj, other.obj) < 0
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def __gt__(self, other):
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"""大于号比较"""
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return mycmp(self.obj, other.obj) > 0
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def __eq__(self, other):
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"""等于号比较"""
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return mycmp(self.obj, other.obj) == 0
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def __le__(self, other):
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"""小于等于号比较"""
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return mycmp(self.obj, other.obj) <= 0
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def __ge__(self, other):
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"""大于等于号比较"""
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return mycmp(self.obj, other.obj) >= 0
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def __ne__(self, other):
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"""不等于号比较"""
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return mycmp(self.obj, other.obj) != 0
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def __hash__(self):
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"""哈希函数"""
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raise TypeError('hash not implemented')
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return K
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# Note: patch for Python 2.6
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if not hasattr(functools, "cmp_to_key"):
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# 如果functools模块中没有cmp_to_key函数，则定义cmp_to_key函数
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functools.cmp_to_key = cmp_to_key
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if sys.version_info >= (3, 0):
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# 如果Python版本大于等于3.0，则将xrange函数替换为range函数
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xrange = range
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# 将buffer函数替换为memoryview函数
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buffer = memoryview
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else:
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# 如果Python版本小于3.0，则保持xrange和buffer函数不变
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xrange = xrange
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buffer = buffer
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def LooseVersion(version):
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"""
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>>> LooseVersion("1.0") == LooseVersion("1.0")
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True
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>>> LooseVersion("1.0.1") > LooseVersion("1.0")
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True
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>>> LooseVersion("1.0.1-") == LooseVersion("1.0.1")
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True
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>>> LooseVersion("1.0.11") < LooseVersion("1.0.111")
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True
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>>> LooseVersion("foobar") > LooseVersion("1.0")
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False
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>>> LooseVersion("1.0") > LooseVersion("foobar")
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False
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>>> LooseVersion("3.22-mysql") == LooseVersion("3.22-mysql-ubuntu0.3")
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True
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>>> LooseVersion("8.0.22-0ubuntu0.20.04.2")
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8.000022
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"""
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# 使用正则表达式匹配版本号
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match = re.search(r"\A(\d[\d.]*)", version or "")
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if match:
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# 如果匹配成功，则将result初始化为0
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result = 0
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# 获取匹配到的第一个分组
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value = match.group(1)
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# 将权重初始化为1.0
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weight = 1.0
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# 将value去掉首尾的.，并按.分割成多个部分
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for part in value.strip('.').split('.'):
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# 如果部分是数字，则将其转换为整数，并乘以权重，加到result中
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if part.isdigit():
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result += int(part) * weight
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# 将权重乘以0.001
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weight *= 1e-3
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else:
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# 如果匹配不成功，则将result设置为NaN
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result = float("NaN")
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# 返回result
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return result
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