/* DNSBL 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 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/>. */

#require dns
#require match_cidr

#pragma regex push +extended

func match_dnsbl(string address, string zone, string range)
    returns number
do
    string rbl_ip
    if %range = 'ANY'
        set rbl_ip '127.0.0.0/8'
    else
        set rbl_ip %range
        if not %range matches '^([0-9]{1,3}\.){3}[0-9]{1,3}$'
            return 0
        fi
    fi

    if not (%address matches '^([0-9]{1,3}\.){3}[0-9]{1,3}$'
             and %address != %range)
        return 0
    fi

    if %address matches
       '^([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})$'
        if match_cidr (resolve ("\4.\3.\2.\1", %zone), %rbl_ip)
            return 1
        else
            return 0
        fi
    fi
    # never reached
done

#pragma regex pop