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/* Cached SPF interface.
Copyright (C) 2007-2011, 2015-2016 Sergey Poznyakoff
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
module 'spf'.
require 'safedb'
#pragma regex push +extended +icase
set spf_database "%__statedir__/spf.db"
set spf_negative_ttl interval("1 day")
const None 0
const Neutral 1
const Pass 2
const Fail 3
const SoftFail 4
const TempError 5
const PermError 6
func spf_status_string(number code) returns string
do
switch code
do
case None: return "None"
case Neutral: return "Neutral"
case Pass: return "Pass"
case Fail: return "Fail"
case SoftFail: return "SoftFail"
case TempError: return "TempError"
case PermError: return "PermError"
done
return "UNKNOWN (%code)"
done
static func __spf_msgid()
returns string
do
if macro_defined("i")
return getmacro("i") . ": "
else
return ""
fi
done
static func __spf_get_cache(string ip, string domain, string sender)
returns number
do
string record safedbget(spf_database, "%ip-%domain-%sender")
number timestamp
number ttl
number result
if record = ""
set result -1
elif record matches '([^ ]+) ([^ ]+) <(.*)> <(.*)>'
set timestamp \1
if time() >= timestamp
echo __spf_msgid() . "CLEARING record %record"
set result -1
else
set result \2
set spf_mechanism \3
set spf_explanation \4
fi
else
echo __spf_msgid() . "ERROR: Malformed DB line: %record"
set result -1
fi
return result
done
static func __spf_put_cache(number result, string ip, string domain,
string sender)
do
safedbput(spf_database, "%ip-%domain-%sender",
(time() + spf_ttl) .
" %result <%spf_mechanism> <%spf_explanation>")
done
static func __spf_log(number cached, number result,
string ip, string domain, string sender)
do
string logmsg "SPF check_host(%ip, %domain, %sender) = " .
spf_status_string(result)
if cached
set logmsg "%logmsg [CACHED]"
fi
if spf_mechanism != ""
set logmsg "%logmsg; matching mechanism \"%spf_mechanism\""
fi
if spf_explanation != ""
set logmsg "%logmsg; %spf_explanation"
fi
echo __spf_msgid() . logmsg
done
func check_host(string ip, string domain, string sender, string helo)
returns number
do
number cached 0
number result __spf_get_cache(ip, domain, sender)
if result == -1
set result spf_check_host(ip, domain, sender, helo, ehlo_domain)
if result = None
set spf_ttl spf_negative_ttl
fi
__spf_put_cache(result, ip, domain, sender)
else
set cached 1
fi
__spf_log(cached, result, ip, domain, sender)
return result
done
#pragma regex pop
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