Proposed ip-up script

ip-up (text/plain), 1.69 KB, created by Alin Năstac (RETIRED) on 2006-02-17 09:51:59 UTC

#!/bin/bash

# this is a script which is executed after connecting the ppp interface.
# look at man pppd for details

# the followings parameters are available:
# $1 = interface-name
# $2 = tty-device
# $3 = speed
# $4 = local-IP-address
# $5 = remote-IP-address
# $6 = ipparam

#Block another instance of "ip-up_or_down $this_interface ..."
#during the execution of this script
LOCKFILE="/var/lock/updown-$1.pid"
if [ -f "${LOCKFILE}" ] ; then
	OTHERPID=$(<"${LOCKFILE}")
	if [ -n "${OTHERPID}" ]; then
		while ps -p "${OTHERPID}" -o cmd | egrep -q "/etc/ppp/ip-(up|down) $1" ; do
			sleep 1s
		done
	fi
fi
echo $$ > "${LOCKFILE}"

#Support for the new Gentoo baselayout
[ -f /sbin/functions.sh ] && source /sbin/functions.sh
if [ -x "${svclib}/net.modules.d/helpers.d/pppd-wrapper" ] &&
   [ -x "/etc/init.d/net.$1" ] ; then

	${svclib}/net.modules.d/helpers.d/pppd-wrapper up $1

elif [ "$USEPEERDNS" ]; then

	# add the server supplied DNS entries to /etc/resolv.conf
	# (taken from debian's 0000usepeerdns)

	# follow any symlink to find the real file
	REALRESOLVCONF=$(readlink --canonicalize /etc/resolv.conf)

	if [ "$REALRESOLVCONF" != "/etc/ppp/resolv.conf" ]; then

		# merge the new nameservers with the other options from the old configuration
		{
			grep --invert-match '^nameserver[[:space:]]' $REALRESOLVCONF
			cat /etc/ppp/resolv.conf
		} > $REALRESOLVCONF.tmp

		# backup the old configuration and install the new one
		cp -dpP $REALRESOLVCONF $REALRESOLVCONF.pppd-backup
		mv $REALRESOLVCONF.tmp $REALRESOLVCONF

		# correct permissions
		chmod 0644 /etc/resolv.conf
		chown root:root /etc/resolv.conf

	fi

fi

[ -f /etc/ppp/ip-up.local ] && . /etc/ppp/ip-up.local "$@"

#Remove the lock file
rm "${LOCKFILE}"