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# Microsoft Azure Linux Agent
#
# Copyright 2014 Microsoft Corporation
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# Requires Python 2.4+ and Openssl 1.0+
import crypt
import random
import string
import struct
import xml.dom.minidom as minidom
import sys
from distutils.version import LooseVersion
def parse_doc(xml_text):
"""
Parse xml document from string
"""
#The minidom lib has some issue with unicode in python2.
#Encode the string into utf-8 first
xml_text = xml_text.encode('utf-8')
return minidom.parseString(xml_text)
def findall(root, tag, namespace=None):
"""
Get all nodes by tag and namespace under Node root.
"""
if root is None:
return []
if namespace is None:
return root.getElementsByTagName(tag)
else:
return root.getElementsByTagNameNS(namespace, tag)
def find(root, tag, namespace=None):
"""
Get first node by tag and namespace under Node root.
"""
nodes = findall(root, tag, namespace=namespace)
if nodes is not None and len(nodes) >= 1:
return nodes[0]
else:
return None
def gettext(node):
"""
Get node text
"""
if node is None:
return None
for child in node.childNodes:
if child.nodeType == child.TEXT_NODE:
return child.data
return None
def findtext(root, tag, namespace=None):
"""
Get text of node by tag and namespace under Node root.
"""
node = find(root, tag, namespace=namespace)
return gettext(node)
def getattrib(node, attr_name):
"""
Get attribute of xml node
"""
if node is not None:
return node.getAttribute(attr_name)
else:
return None
def unpack(buf, offset, range):
"""
Unpack bytes into python values.
"""
result = 0
for i in range:
result = (result << 8) | str_to_ord(buf[offset + i])
return result
def unpack_little_endian(buf, offset, length):
"""
Unpack little endian bytes into python values.
"""
return unpack(buf, offset, list(range(length - 1, -1, -1)))
def unpack_big_endian(buf, offset, length):
"""
Unpack big endian bytes into python values.
"""
return unpack(buf, offset, list(range(0, length)))
def hex_dump3(buf, offset, length):
"""
Dump range of buf in formatted hex.
"""
return ''.join(['%02X' % str_to_ord(char) for char in buf[offset:offset + length]])
def hex_dump2(buf):
"""
Dump buf in formatted hex.
"""
return hex_dump3(buf, 0, len(buf))
def is_in_range(a, low, high):
"""
Return True if 'a' in 'low' <= a >= 'high'
"""
return (a >= low and a <= high)
def is_printable(ch):
"""
Return True if character is displayable.
"""
return (is_in_range(ch, str_to_ord('A'), str_to_ord('Z'))
or is_in_range(ch, str_to_ord('a'), str_to_ord('z'))
or is_in_range(ch, str_to_ord('0'), str_to_ord('9')))
def hex_dump(buffer, size):
"""
Return Hex formated dump of a 'buffer' of 'size'.
"""
if size < 0:
size = len(buffer)
result = ""
for i in range(0, size):
if (i % 16) == 0:
result += "%06X: " % i
byte = buffer[i]
if type(byte) == str:
byte = ord(byte.decode('latin1'))
result += "%02X " % byte
if (i & 15) == 7:
result += " "
if ((i + 1) % 16) == 0 or (i + 1) == size:
j = i
while ((j + 1) % 16) != 0:
result += " "
if (j & 7) == 7:
result += " "
j += 1
result += " "
for j in range(i - (i % 16), i + 1):
byte=buffer[j]
if type(byte) == str:
byte = str_to_ord(byte.decode('latin1'))
k = '.'
if is_printable(byte):
k = chr(byte)
result += k
if (i + 1) != size:
result += "\n"
return result
def str_to_ord(a):
"""
Allows indexing into a string or an array of integers transparently.
Generic utility function.
"""
if type(a) == type(b'') or type(a) == type(u''):
a = ord(a)
return a
def compare_bytes(a, b, start, length):
for offset in range(start, start + length):
if str_to_ord(a[offset]) != str_to_ord(b[offset]):
return False
return True
def int_to_ip4_addr(a):
"""
Build DHCP request string.
"""
return "%u.%u.%u.%u" % ((a >> 24) & 0xFF,
(a >> 16) & 0xFF,
(a >> 8) & 0xFF,
(a) & 0xFF)
def hexstr_to_bytearray(a):
"""
Return hex string packed into a binary struct.
"""
b = b""
for c in range(0, len(a) // 2):
b += struct.pack("B", int(a[c * 2:c * 2 + 2], 16))
return b
def set_ssh_config(config, name, val):
notfound = True
for i in range(0, len(config)):
if config[i].startswith(name):
config[i] = "{0} {1}".format(name, val)
notfound = False
elif config[i].startswith("Match"):
#Match block must be put in the end of sshd config
break
if notfound:
config.insert(i, "{0} {1}".format(name, val))
return config
def remove_bom(c):
if str_to_ord(c[0]) > 128 and str_to_ord(c[1]) > 128 and \
str_to_ord(c[2]) > 128:
c = c[3:]
return c
def gen_password_hash(password, crypt_id, salt_len):
collection = string.ascii_letters + string.digits
salt = ''.join(random.choice(collection) for _ in range(salt_len))
salt = "${0}${1}".format(crypt_id, salt)
return crypt.crypt(password, salt)
Version = LooseVersion
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