Stuart D. Gathman
85 lines
2.3 KiB
Python
85 lines
2.3 KiB
Python
try:
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from bsddb3 import db
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class DB(object):
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def open(self,fname,mode):
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if mode == 'r': flags = db.DB_RDONLY
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else: raise RuntimeException('unsupported mode')
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self.f = db.DB()
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self.f.open(fname,flags=flags)
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def __contains__(self,key):
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return not not self.f.get(key)
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def __getitem__(self,key):
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v = self.f.get(key)
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if not v: raise KeyError(key)
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return v
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def close(self):
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self.f.close()
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def dbmopen(fname,mode):
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f = DB()
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f.open(fname,mode)
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return f
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except ModuleNotFoundError: raise
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except:
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import anydbm as dbm
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dbmopen = dbm.open
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class MTAPolicy(object):
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"Get SPF policy by result from sendmail style access file."
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def __init__(self,sender,conf,access_file=None):
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if not access_file:
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access_file = conf.access_file
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self.use_nulls = conf.access_file_nulls
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try:
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self.use_colon = conf.access_file_colon
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except:
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self.use_colon = True
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self.sender = sender
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self.domain = sender.split('@')[-1].lower()
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self.acf = None
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self.access_file = access_file
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def close(self):
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if self.acf:
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self.acf.close()
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def __enter__(self):
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self.acf = None
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if self.access_file:
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try:
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self.acf = dbmopen(self.access_file,'r')
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except:
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print('%s: Cannot open for reading'%self.access_file)
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raise
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return self
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def __exit__(self,t,v,b): self.close()
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def getPolicy(self,pfx):
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acf = self.acf
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if not acf: return None
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if self.use_nulls: sfx = b'\x00'
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else: sfx = b''
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if self.use_colon:
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sep = b':'
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else:
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sep = b'!'
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pfx = pfx.encode() + sep
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try: # try with localpart@domain
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return acf[pfx + self.sender.encode() + sfx].rstrip(b'\x00').decode()
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except KeyError:
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try: # try with domain
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d = self.domain.encode()
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k = pfx + d + sfx
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while not k in acf and b'.' in d:
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# check partial domains
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d = b'.'.join(d.split(b'.')[1:])
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k = pfx + b'.' + d + sfx
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return acf[k].rstrip(b'\x00').decode()
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except KeyError:
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try: # try bare prefix
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return acf[pfx + sfx].rstrip(b'\x00').decode()
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except KeyError:
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try:
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return acf[pfx[:-1] + sfx].rstrip(b'\x00').decode()
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except KeyError:
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return None
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