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jblitzar
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github-python-corpus

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self.options = {}
try:
self.lookups = 0
if not spf:
spf = self.dns_spf(self.d)
if self.verbose: self.log("top",self.d,spf)
if self.libspf_local and spf:
spf = insert_libspf_local_policy(
spf, self.libspf_local)
rc = self.check1(spf, self.d, 0)
if self.perm_error:
# lax processing encountered a permerror, but continued
self.perm_error.ext = rc
raise self.perm_error
return rc
except TempError as x:
self.prob = x.msg
if x.mech:
self.mech.append(x.mech)
return ('temperror', 451, 'SPF Temporary Error: ' + str(x))
except PermError as x:
if not self.perm_error:
self.perm_error = x
self.prob = x.msg
if x.mech:
self.mech.append(x.mech)
# Pre-Lentczner draft treats this as an unknown result
# and equivalent to no SPF record.
return ('permerror', 550, 'SPF Permanent Error: ' + str(x))
def check1(self, spf, domain, recursion):
# spf rfc: 3.7 Processing Limits
#
if recursion > MAX_RECURSION:
# This should never happen in strict mode
# because of the other limits we check,
# so if it does, there is something wrong with
# our code. It is not a PermError because there is not
# necessarily anything wrong with the SPF record.
if self.strict:
raise AssertionError('Too many levels of recursion')
# As an extended result, however, it should be
# a PermError.
raise PermError('Too many levels of recursion')
try:
try:
tmp, self.d = self.d, domain
return self.check0(spf, recursion)
finally:
self.d = tmp
except AmbiguityWarning as x:
self.prob = x.msg
if x.mech:
self.mech.append(x.mech)
return ('ambiguous', 000, 'SPF Ambiguity Warning: %s' % x)
def note_error(self, *msg):
if self.strict:
raise PermError(*msg)
# if lax mode, note error and continue
if not self.perm_error:
try:
raise PermError(*msg)
except PermError as x:
# FIXME: keep a list of errors for even friendlier diagnostics.
self.perm_error = x
return self.perm_error
def expand_domain(self,arg):
"validate and expand domain-spec"
# any trailing dot was removed by expand()
if RE_TOPLAB.split(arg)[-1]:
raise PermError('Invalid domain found (use FQDN)', arg)
return self.expand(arg)
def validate_mechanism(self, mech):
"""Parse and validate a mechanism.
Returns mech,m,arg,cidrlength,result
Examples:
>>> q = query(s='strong-bad@email.example.com.',
... h='mx.example.org', i='192.0.2.3')
>>> q.validate_mechanism('A')
('A', 'a', 'email.example.com', 32, 'pass')
>>> q = query(s='strong-bad@email.example.com',
... h='mx.example.org', i='192.0.2.3')
>>> q.validate_mechanism('A//64')
('A//64', 'a', 'email.example.com', 32, 'pass')
>>> q.validate_mechanism('A/24//64')
('A/24//64', 'a', 'email.example.com', 24, 'pass')
>>> q.validate_mechanism('?mx:%{d}/27')
('?mx:%{d}/27', 'mx', 'email.example.com', 27, 'neutral')
>>> try: q.validate_mechanism('ip4:1.2.3.4/247')
... except PermError as x: print(x)