/usr/lib/python2.7/dist-packages/framework/cxnet/common.py is in fso-frameworkd 0.10.1-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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libc, csum etc.
"""
# Copyright (c) 2008 Peter V. Saveliev
#
# This file is part of Connexion project.
#
# Connexion is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# Connexion is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Connexion; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
__all__ = [
"cx_int",
"libc",
"hdump",
"hprint",
"csum",
"csum_words",
"csum_complement",
]
from ctypes import *
from sys import maxint
if maxint == 2147483647:
cx_int = c_uint32
else:
cx_int = c_uint64
libc = CDLL("libc.so.6")
def hdump(name,msg,size=0):
"""
Dump a packet into a file
"""
if not size:
size = sizeof(msg)
fd = libc.open(name,577,384)
libc.write(fd,byref(msg),size)
libc.close(fd)
def hline(msg,size=0):
"""
Format packet into a string
"""
if not size:
size = sizeof(msg)
length = size
offset = 0
ptr = addressof(msg)
line = ""
result = ""
while offset < length:
a = c_ubyte.from_address(ptr).value
result += "%02x " % (a)
if 31 < a and a < 127:
line += chr(a)
else:
line += '.'
if offset:
if not (offset + 1) % 8:
result += ": "
if not (offset + 1) % 16:
result += "\t %s\n" % (str(line))
line = ""
offset += 1
ptr += 1
if line:
result += "\t\t\t\t %s\n" % (str(line))
return result
def hprint(msg,size=0):
"""
Dump a packet onto stdout
"""
print hline(msg,size)
class be16 (BigEndianStructure):
_fields_ = [
("c", c_uint16),
]
def csum_words(msg,l):
odd = False
if (l%2):
l -= 1
odd = True
# l is in bytes. We need 16-bit words
a = addressof(msg)
x = 0
for i in xrange(0,l,2):
c = be16.from_address(a + i)
x += c.c
if odd:
last = c_uint16(c_uint8.from_address(a + l).value << 8)
x += last.value
return x
def csum_complement(x):
x = c_uint32(x)
x1 = c_uint16.from_address(addressof(x))
x2 = c_uint16.from_address(addressof(x) + 2)
return ~c_uint16(x1.value + x2.value).value
def csum(msg,l):
##
# details: rfc 1071
# a simple description: http://www.netfor2.com/checksum.html
##
return csum_complement(csum_words(msg,l))
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