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|
## @package Milter.utils
# Miscellaneous functions.
#
import re
import struct
import socket
import email.errors
from email.header import decode_header
import email.base64mime
import email.utils
from fnmatch import fnmatchcase
from binascii import a2b_base64
dnsre = re.compile(r'^[a-z][-a-z\d.]+$', re.IGNORECASE)
PAT_IP4 = r'\.'.join([r'(?:\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])']*4)
ip4re = re.compile(PAT_IP4+'$')
ip6re = re.compile( '(?:%(hex4)s:){6}%(ls32)s$'
'|::(?:%(hex4)s:){5}%(ls32)s$'
'|(?:%(hex4)s)?::(?:%(hex4)s:){4}%(ls32)s$'
'|(?:(?:%(hex4)s:){0,1}%(hex4)s)?::(?:%(hex4)s:){3}%(ls32)s$'
'|(?:(?:%(hex4)s:){0,2}%(hex4)s)?::(?:%(hex4)s:){2}%(ls32)s$'
'|(?:(?:%(hex4)s:){0,3}%(hex4)s)?::%(hex4)s:%(ls32)s$'
'|(?:(?:%(hex4)s:){0,4}%(hex4)s)?::%(ls32)s$'
'|(?:(?:%(hex4)s:){0,5}%(hex4)s)?::%(hex4)s$'
'|(?:(?:%(hex4)s:){0,6}%(hex4)s)?::$'
% {
'ls32': r'(?:[0-9a-f]{1,4}:[0-9a-f]{1,4}|%s)'%PAT_IP4,
'hex4': r'[0-9a-f]{1,4}'
}, re.IGNORECASE)
# from spf.py
def addr2bin(s):
"""Convert a string IPv4 address into an unsigned integer."""
if s.find(':') >= 0:
try:
return bin2long6(inet_pton(s))
except:
raise socket.error("Invalid IP6 address: "+s)
try:
return struct.unpack("!L", socket.inet_aton(s))[0]
except socket.error:
raise socket.error("Invalid IP4 address: "+s)
def bin2long6(s):
"""Convert binary IP6 address into an unsigned Python long integer."""
h, l = struct.unpack("!QQ", s)
return h << 64 | l
if hasattr(socket,'has_ipv6') and socket.has_ipv6:
def inet_ntop(s):
return socket.inet_ntop(socket.AF_INET6,s)
def inet_pton(s):
return socket.inet_pton(socket.AF_INET6,s.strip())
else:
from pyip6 import inet_ntop, inet_pton
MASK = 0xFFFFFFFF
MASK6 = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF
def cidr(i,n,mask=MASK):
return ~(mask >> n) & mask & i
def iniplist(ipaddr,iplist):
"""Return whether ip is in cidr list
>>> iniplist('66.179.26.146',['127.0.0.1','66.179.26.128/26'])
True
>>> iniplist('127.0.0.1',['127.0.0.1','66.179.26.128/26'])
True
>>> iniplist('192.168.0.45',['192.168.0.*'])
True
>>> iniplist('4.2.2.2',['b.resolvers.Level3.net'])
True
>>> iniplist('2606:2800:220:1::',['example.com/40'])
True
>>> iniplist('4.2.2.2',['nothing.example.com'])
False
>>> iniplist('2001:610:779:0:223:6cff:fe9a:9cf3',['127.0.0.1','172.20.1.0/24','2001:610:779::/48'])
True
>>> iniplist('2G01:610:779:0:223:6cff:fe9a:9cf3',['127.0.0.1','172.20.1.0/24','2001:610:779::/48'])
Traceback (most recent call last):
...
ValueError: Invalid ip syntax:2G01:610:779:0:223:6cff:fe9a:9cf3
"""
if ip4re.match(ipaddr):
fam = socket.AF_INET
ipnum = addr2bin(ipaddr)
elif ip6re.match(ipaddr):
fam = socket.AF_INET6
ipnum = bin2long6(inet_pton(ipaddr))
else:
raise ValueError('Invalid ip syntax:'+ipaddr)
for pat in iplist:
p = pat.split('/',1)
if ip4re.match(p[0]):
if len(p) > 1:
n = int(p[1])
else:
n = 32
if cidr(addr2bin(p[0]),n) == cidr(ipnum,n):
return True
elif ip6re.match(p[0]):
if len(p) > 1:
n = int(p[1])
else:
n = 128
if cidr(bin2long6(inet_pton(p[0])),n,MASK6) == cidr(ipnum,n,MASK6):
return True
elif dnsre.match(p[0]):
try:
sfx = '/'.join(['']+p[1:])
addrlist = [r[4][0]+sfx for r in socket.getaddrinfo(p[0],25,fam)]
if iniplist(ipaddr,addrlist):
return True
except socket.gaierror: pass
elif fnmatchcase(ipaddr,pat):
return True
return False
## Split email into Fullname and address.
# This replaces <code>email.utils.parseaddr</code> but fixes
# some <a href="http://bugs.python.org/issue1025395">tricky test cases</a>.
# Additional tricky cases are still broken. Patches welcome.
#
def parseaddr(t):
"""Split email into Fullname and address.
>>> parseaddr('user@example.com')
('', 'user@example.com')
>>> parseaddr('"Full Name" <foo@example.com>')
('Full Name', 'foo@example.com')
>>> parseaddr('spam@spammer.com <foo@example.com>')
('spam@spammer.com', 'foo@example.com')
>>> parseaddr('God@heaven <@hop1.org,@hop2.net:jeff@spec.org>')
('God@heaven', 'jeff@spec.org')
>>> parseaddr('Real Name ((comment)) <addr...@example.com>')
('Real Name (comment)', 'addr...@example.com')
"""
#return email.utils.parseaddr(t)
res = email.utils.parseaddr(t)
# dirty fix for some broken cases
if not res[0]:
pos = t.find('<')
if pos > 0 and t[-1] == '>':
addrspec = t[pos+1:-1]
pos1 = addrspec.rfind(':')
if pos1 > 0:
addrspec = addrspec[pos1+1:]
return email.utils.parseaddr('"%s" <%s>' % (t[:pos].strip(),addrspec))
if not res[1]:
pos = t.find('<')
if pos > 0 and t[-1] == '>':
addrspec = t[pos+1:-1]
pos1 = addrspec.rfind(':')
if pos1 > 0:
addrspec = addrspec[pos1+1:]
return email.utils.parseaddr('%s<%s>' % (t[:pos].strip(),addrspec))
return res
## Fix email.base64mime.decode to add any missing padding
def decode(s, convert_eols=None):
if not s: return s
while len(s) % 4: s += '=' # add missing padding
dec = a2b_base64(s)
if convert_eols:
return dec.replace(CRLF, convert_eols)
return dec
email.base64mime.decode = decode
def parse_addr(t):
"""Split email into user,domain.
>>> parse_addr('user@example.com')
['user', 'example.com']
>>> parse_addr('"user@example.com"')
['user@example.com']
>>> parse_addr('"user@bar"@example.com')
['user@bar', 'example.com']
>>> parse_addr('foo')
['foo']
>>> parse_addr('@mx.example.com:user@example.com')
['user', 'example.com']
>>> parse_addr('@user@example.com')
['@user', 'example.com']
"""
if t.startswith('<') and t.endswith('>'): t = t[1:-1]
if t.startswith('"'):
if t.endswith('"'): return [t[1:-1]]
pos = t.find('"@')
if pos > 0: return [t[1:pos],t[pos+2:]]
if t.startswith('@'):
try: t = t.split(':',1)[1]
except IndexError: pass
return t.rsplit('@',1)
## Decode headers gratuitously encoded to hide the content.
# Spammers often encode headers to obscure the content from
# spam filters. This function decodes gratuitously encoded
# headers.
# @param val the raw header value
# @return the decoded value or the original raw value
def parse_header(val):
"""Decode headers gratuitously encoded to hide the content.
"""
try:
h = decode_header(val)
if not len(h) or (not h[0][1] and len(h) == 1): return val
u = []
for s,enc in h:
if enc:
try:
u.append(s.decode(enc,'replace'))
except LookupError:
u.append(s.decode())
else:
u.append(s.decode())
u = ''.join(u)
if type(u) is str: return u
for enc in ('us-ascii','iso-8859-1','utf-8'):
try:
return u.encode(enc)
except UnicodeError: continue
except UnicodeDecodeError: pass
except LookupError: pass
except ValueError: pass
except email.errors.HeaderParseError: pass
return val
|
