68 lines
2.4 KiB
Plaintext
68 lines
2.4 KiB
Plaintext
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#!/bin/sh
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# sip_nat_settings: generate NAT settings for sip.conf of an Asterisk system
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# that is behind a NAT router.
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#
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# This is a script to generate sane defaults for externip and localnet
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# of sip.conf. The output should be included in the [general] section of
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# sip.conf .
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#
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# Multiple network interfaces: If you have multiple network interfaces,
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# this script will generate a 'localnet' line for each of them that has a
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# broadcast (ipv4) address, except the loopback interface (lo). You can
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# later rem-out all of those you don't need.
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#
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# Alternatively, provide a network interface as a parameter an a localnet
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# line will only be generated for its network.
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#
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# Copyright (C) 2005 by Tzafrir Cohen <tzafrir.cohen@xorcom.com>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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# see http://unix.stackexchange.com/q/22615
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externip=`dig @resolver1.opendns.com -4 myip.opendns.com A +short`
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# optional parameter: network interface to use. By default: none.
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IFACE="$1"
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OS=`uname -s`
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case "$OS" in
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Linux)
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echo "externip = $externip"
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if [ -x "${IFACE}" ]; then
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ip --brief -family inet address show scope global up dev $IFACE | awk '{print "localnet = " $3}'
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else
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ip --brief -family inet address show scope global up | awk '{print "localnet = " $3}'
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fi
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;;
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OpenBSD|FreeBSD)
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if [ "${OS}" = "FreeBSD" ]; then
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VER=`uname -r | cut -d . -f 1`
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if [ ${VER} -lt 7 ]; then
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echo "Unsupported OS"
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exit 1
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fi
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fi
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echo "externip = $externip"
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ip=`/sbin/ifconfig $IFACE | awk '/\tinet .* broadcast/{print $6}'`
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x=`/sbin/ifconfig $IFACE | awk '/\tinet .* broadcast/{print $4}'`
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printf 'localnet = %s/%u.%u.%u.%u\n' $ip $(($x>>24&0xff)) $(($x>>16&0xff)) $(($x>>8&0xff)) $(($x&0xff))
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;;
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*)
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echo >&2 "$0: Unsupported OS $OS"
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exit 1
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;;
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esac
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