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/* HELO consistency checker
Copyright (C) 2006, 2007 Jan Rafaj
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 2, 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, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
MA 02110-1301 USA */
#require is_ip
#require dns
const HELO_SUCCESS 0
const HELO_MYIP 1 # ARG is our IP address.
const HELO_IPNOMATCH 2 # ARG is an IP, but it does not match the remote
# party IP address.
const HELO_ARGNORESOLVE 3 # ARG is an IP, but it does not resolve.
const HELO_ARGNOIP 4 # ARG is in square brackets, but it is not an
# IP address.
const HELO_ARGINVALID 5 # ARG is not an IP address and does not resolve
# to one.
const HELO_MYSERVERIP 6 # ARG resolves to our server IP.
const HELO_IPMISMATCH 7 # ARG does not resolve to the remote client
# IP address
#pragma regex push +extended
func __domainof(string arg) returns string
do
if %arg matches '[^.]+\.(.*)'
return \1
else
return %arg
fi
done
func heloarg_test(string arg, string remote_ip, string local_ip)
returns number
do
string helo_arg
number heloarg_must_be_ip
set helo_arg %arg
set heloarg_must_be_ip 0
if %arg matches '^\[(.*)\]$'
set helo_arg "\1"
set heloarg_must_be_ip 1
fi
if is_ip (%helo_arg)
if (%helo_arg = %local_ip and %local_ip != %remote_ip)
# `HELO' arg may not be this server's IP
return HELO_MYIP
elif %helo_arg != %remote_ip
# `HELO' arg does not match remote server's IP
return HELO_IPNOMATCH
elif (%heloarg_must_be_ip = 0
and hostname %helo_arg = %helo_arg)
# `HELO' arg not in brackets and doesnt resolve
return HELO_ARGNORESOLVE
else
return HELO_SUCCESS
fi
elif %heloarg_must_be_ip = 1
# `HELO' arg in brackets is not an IP
return HELO_ARGNOIP
elif ismx(%helo_arg, %remote_ip)
or __domainof(hostname(%remote_ip)) = %helo_arg
return HELO_SUCCESS
elif (resolve %helo_arg = "0")
# `HELO' arg does not resolve to an IP
return HELO_ARGINVALID
elif (%helo_arg = hostname %local_ip
and %local_ip != %remote_ip)
# `HELO' arg may not be this server's hostname
return HELO_MYSERVERIP
elif (resolve %helo_arg != %remote_ip
and hostname %remote_ip != %helo_arg)
# `HELO' arg does not resolve to remote server's IP nor to its
# domain
return HELO_IPMISMATCH
else
return HELO_SUCCESS
fi
done
#pragma regex pop
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