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annotate roundup/backends/portalocker.py @ 5204:c8bf4e9912ed

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convert classic template for csrf defense
author John Rouillard <rouilj@ieee.org>
date Sat, 18 Mar 2017 22:55:50 -0400
parents a76fbb9f5535
children 64b05e24dbd8
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 #!/usr/bin/env python
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2 #
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3 # portalocker.py - Cross-platform (posix/nt) API for flock-style file locking.
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4 #
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5 # http://code.activestate.com/recipes/65203-portalocker-cross-platform-posixnt-api-for-flock-s/
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6 #
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7 """
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8 Cross-platform (posix/nt) API for flock-style file locking.
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9
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10 Synopsis::
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11
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12 import portalocker
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13 file = open("somefile", "r+")
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14 portalocker.lock(file, portalocker.LOCK_EX)
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15 file.seek(12)
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16 file.write("foo")
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17 file.close()
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18
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19 If you know what you're doing, you may choose to::
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20
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21 portalocker.unlock(file)
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22
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23 before closing the file, but why?
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24
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25 Methods::
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26
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27 lock( file, flags )
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28 unlock( file )
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29
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30 Constants::
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31
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32 LOCK_EX
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33 LOCK_SH
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34 LOCK_NB
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35
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36 I learned the win32 technique for locking files from sample code
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37 provided by John Nielsen <nielsenjf@my-deja.com> in the documentation
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38 that accompanies the win32 modules.
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39
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40 :Author: Jonathan Feinberg <jdf@pobox.com>
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41
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42 Roundup Changes
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43 ---------------
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44 2012-11-28 (anatoly techtonik)
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45 - Ported to ctypes
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46 - Dropped support for Win95, Win98 and WinME
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47 - Added return result
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48 """
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49
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50 __docformat__ = 'restructuredtext'
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51
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52 import os
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53
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54 if os.name == 'nt':
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55 import msvcrt
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56 import ctypes
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57 from ctypes import windll
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58 from ctypes.wintypes import BOOL, DWORD, HANDLE
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59
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60 LOCK_SH = 0 # the default
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61 LOCK_NB = 0x1 # LOCKFILE_FAIL_IMMEDIATELY
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62 LOCK_EX = 0x2 # LOCKFILE_EXCLUSIVE_LOCK
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63
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64 # --- the code is taken from pyserial project ---
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65 #
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66 # detect size of ULONG_PTR
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67 def is_64bit():
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68 return ctypes.sizeof(ctypes.c_ulong) != ctypes.sizeof(ctypes.c_void_p)
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69 if is_64bit():
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70 ULONG_PTR = ctypes.c_int64
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71 else:
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72 ULONG_PTR = ctypes.c_ulong
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73 PVOID = ctypes.c_void_p
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74
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75 # --- Union inside Structure by stackoverflow:3480240 ---
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76 class _OFFSET(ctypes.Structure):
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77 _fields_ = [
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78 ('Offset', DWORD),
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79 ('OffsetHigh', DWORD)]
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80
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81 class _OFFSET_UNION(ctypes.Union):
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82 _anonymous_ = ['_offset']
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83 _fields_ = [
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84 ('_offset', _OFFSET),
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85 ('Pointer', PVOID)]
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86
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87 class OVERLAPPED(ctypes.Structure):
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88 _anonymous_ = ['_offset_union']
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89 _fields_ = [
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90 ('Internal', ULONG_PTR),
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91 ('InternalHigh', ULONG_PTR),
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92 ('_offset_union', _OFFSET_UNION),
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93 ('hEvent', HANDLE)]
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94
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95 LPOVERLAPPED = ctypes.POINTER(OVERLAPPED)
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96
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97 # --- Define function prototypes for extra safety ---
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98 LockFileEx = windll.kernel32.LockFileEx
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99 LockFileEx.restype = BOOL
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100 LockFileEx.argtypes = [HANDLE, DWORD, DWORD, DWORD, DWORD, LPOVERLAPPED]
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101 UnlockFileEx = windll.kernel32.UnlockFileEx
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102 UnlockFileEx.restype = BOOL
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103 UnlockFileEx.argtypes = [HANDLE, DWORD, DWORD, DWORD, LPOVERLAPPED]
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104
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105 elif os.name == 'posix':
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106 import fcntl
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107 LOCK_SH = fcntl.LOCK_SH # shared lock
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108 LOCK_NB = fcntl.LOCK_NB # non-blocking
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109 LOCK_EX = fcntl.LOCK_EX
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110 else:
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111 raise RuntimeError("PortaLocker only defined for nt and posix platforms")
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112
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113 if os.name == 'nt':
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114 def lock(file, flags):
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115 """ Return True on success, False otherwise """
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116 hfile = msvcrt.get_osfhandle(file.fileno())
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117 overlapped = OVERLAPPED()
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118 if LockFileEx(hfile, flags, 0, 0, 0xFFFF0000, ctypes.byref(overlapped)):
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119 return True
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120 else:
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121 return False
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122
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123 def unlock(file):
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124 hfile = msvcrt.get_osfhandle(file.fileno())
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125 overlapped = OVERLAPPED()
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126 if UnlockFileEx(hfile, 0, 0, 0xFFFF0000, ctypes.byref(overlapped)):
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127 return True
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128 else:
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129 return False
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131 elif os.name =='posix':
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132 def lock(file, flags):
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133 if fcntl.flock(file.fileno(), flags) == 0:
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134 return True
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135 else:
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136 return False
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137
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138 def unlock(file):
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139 if fcntl.flock(file.fileno(), fcntl.LOCK_UN) == 0:
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140 return True
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141 else:
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142 return False
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143
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144 if __name__ == '__main__':
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145 from time import time, strftime, localtime
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146 import sys
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147
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148 log = open('log.txt', "a+")
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149 lock(log, LOCK_EX)
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150
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151 timestamp = strftime("%m/%d/%Y %H:%M:%S\n", localtime(time()))
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152 log.write( timestamp )
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153
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154 print "Wrote lines. Hit enter to release lock."
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155 dummy = sys.stdin.readline()
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156
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157 log.close()
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158
Roundup Issue Tracker: http://roundup-tracker.org/