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#!/usr/bin/tclsh
#
# This file is part of SAUCE, a very picky anti-spam receiver-SMTP.
# SAUCE is Copyright (C) 1997-2003 Ian Jackson
#
# 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#
# $Id: firewall.tcl,v 1.6 2003/09/20 18:22:59 ian Exp $
# usage: .../firewall <chain> <target> -- [<ip-address> ...]
# invoked by SAUCE from userv using with-lock
set ipchains ipchains
set iptables iptables
set chain [lindex $argv 0]
set target [lindex $argv 1]
if {"[lindex $argv 2]" != "--"} { error "bad delimiter" }
set addrs [lrange $argv 3 end]
if {[file exists /proc/net/ip_tables_names]} {
set ipspongs $iptables
if {![string compare $target DENY]} { set target DROP }
} else {
set ipspongs $ipchains
if {![string compare $target DROP]} { set target DENY }
}
set lchan [open |[list $ipspongs -n -L $chain] r]
set ix 0
while {[gets $lchan l] >= 0} {
if {[regexp {^Chain \w+ \(.*\)\:?$} $l] || \
[regexp {^target\s+prot\s+opt\s+source\s+destination} $l]} {
} elseif {[regexp \
{^\w+\s+\w+\s+\-+\s+([.0-9]+)\s+0\.0\.0\.0/0(?:\s+n/a)?\s*$}\
$l dummy b_now_this]} {
set b_now($b_now_this) [incr ix]
} else {
error "unknown $l"
}
}
close $lchan
foreach a $addrs {
if {![regexp {^(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})$} $a ma]} {
error "bad address $a"
}
set b_want($ma) 1
}
proc modify_chain {what addr} {
global ipspongs chain target
set cmd [list $ipspongs $what $chain -j $target -s $addr]
puts $cmd
lappend cmd >@ stderr 2>@ stderr
eval exec $cmd
}
foreach x [array names b_now] {
if {[info exists b_want($x)]} continue
modify_chain -D $x
}
foreach x [array names b_want] {
if {[info exists b_now($x)]} continue
modify_chain -A $x
}
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