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mech = None
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if not recursion: # record matching mechanism at base level
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self.mechanism = mech
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if result == 'fail':
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return (result, 550, exps[result])
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else:
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return (result, 250, exps[result])
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def check_lookups(self):
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self.lookups = self.lookups + 1
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if self.lookups > MAX_LOOKUP*4:
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raise PermError('More than %d DNS lookups'%(MAX_LOOKUP*4))
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if self.lookups > MAX_LOOKUP:
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self.note_error('Too many DNS lookups')
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def get_explanation(self, spec):
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"""Expand an explanation."""
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if spec:
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try:
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a = self.dns_txt(spec,ignore_void=True)
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if len(a) == 1:
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return str(self.expand(to_ascii(a[0]), stripdot=False))
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except PermError:
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# RFC4408 6.2/4 syntax errors cause exp= to be ignored
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if self.strict > 1:
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raise # but report in harsh mode for record checking tools
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pass
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elif self.strict > 1:
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raise PermError('Empty domain-spec on exp=')
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# RFC4408 6.2/4 empty domain spec is ignored
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# (unless you give precedence to the grammar).
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return None
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def expand(self, s, stripdot=True): # macros='slodipvh'
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"""Do SPF RFC macro expansion.
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Examples:
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>>> q = query(s='strong-bad@email.example.com',
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... h='mx.example.org', i='192.0.2.3')
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>>> q.p = 'mx.example.org'
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>>> q.r = 'example.net'
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>>> q.expand('%{d}')
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'email.example.com'
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>>> q.expand('%{d4}')
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'email.example.com'
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>>> q.expand('%{d3}')
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'email.example.com'
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>>> q.expand('%{d2}')
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'example.com'
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>>> q.expand('%{d1}')
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'com'
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>>> q.expand('%{p}')
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'mx.example.org'
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>>> q.expand('%{p2}')
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'example.org'
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>>> q.expand('%{dr}')
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'com.example.email'
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>>> q.expand('%{d2r}')
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'example.email'
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>>> q.expand('%{l}')
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'strong-bad'
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>>> q.expand('%{l-}')
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'strong.bad'
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>>> q.expand('%{lr}')
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'strong-bad'
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>>> q.expand('%{lr-}')
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'bad.strong'
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>>> q.expand('%{l1r-}')
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'strong'
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>>> q.expand('%{c}',stripdot=False)
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'192.0.2.3'
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>>> q.expand('%{r}',stripdot=False)
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'example.net'
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>>> q.expand('%{ir}.%{v}._spf.%{d2}')
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'3.2.0.192.in-addr._spf.example.com'
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>>> q.expand('%{lr-}.lp._spf.%{d2}')
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'bad.strong.lp._spf.example.com'
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>>> q.expand('%{lr-}.lp.%{ir}.%{v}._spf.%{d2}')
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'bad.strong.lp.3.2.0.192.in-addr._spf.example.com'
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