Here is a first shot at a pyparsing parser for these lines:
from pyparsing import *
SET,POLICY,ID,FROM,TO,NAT,SRC,DST,IP,PORT,SCHEDULE,LOG,PERMIT,ALLOW,DENY =
map(CaselessKeyword,
"SET,POLICY,ID,FROM,TO,NAT,SRC,DST,IP,PORT,SCHEDULE,LOG,PERMIT,ALLOW,DENY".split(','))
integer = Word(nums)
ipAddr = Combine(integer + ('.'+integer)*3)
quotedString.setParseAction(removeQuotes)
logParser = (SET + POLICY + ID + integer("id") +
FROM + quotedString("from_") +
TO + quotedString("to_") + quotedString("service"))
I run this with:
for line in """
1- set policy id 1000 from "Untrust" to "Trust" "Any" "1.1.1.1" "HTTP" nat dst
ip 10.10.10.10 port 8000 permit log
2- set policy id 5000 from "Trust" to "Untrust" "Any" "microsoft.com" "HTTP"
nat src permit schedule "14August2014" log
3- set policy id 7000 from "Trust" to "Untrust" "Users" "Any" "ANY" nat src
dip-id 4 permit log
4- set policy id 7000 from "Trust" to "Untrust" "servers" "Any" "ANY" deny
""".splitlines():
line = line.strip()
if not line: continue
print (integer + '-' + logParser).parseString(line).dump()
print
Getting:
['1', '-', 'SET', 'POLICY', 'ID', '1000', 'FROM', 'Untrust', 'TO', 'Trust',
'Any']
- from_: Untrust
- id: 1000
- service: Any
- to_: Trust
['2', '-', 'SET', 'POLICY', 'ID', '5000', 'FROM', 'Trust', 'TO', 'Untrust',
'Any']
- from_: Trust
- id: 5000
- service: Any
- to_: Untrust
['3', '-', 'SET', 'POLICY', 'ID', '7000', 'FROM', 'Trust', 'TO', 'Untrust',
'Users']
- from_: Trust
- id: 7000
- service: Users
- to_: Untrust
['4', '-', 'SET', 'POLICY', 'ID', '7000', 'FROM', 'Trust', 'TO', 'Untrust',
'servers']
- from_: Trust
- id: 7000
- service: servers
- to_: Untrust
Pyparsing adds Optional classes so that you can include expressions for pieces
that might be missing like "... + Optional(NAT + (SRC | DST)) + ..."
-- Paul
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