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|
#!/bin/bash
#
# This is a sample /etc/dhcpc/dhcpcd.exe script.
# /etc/dhcpc/dhcpcd.exe script is executed by dhcpcd daemon
# any time it configures or shuts down interface.
# The following parameters are passed to dhcpcd.exe script:
# $1 = HostInfoFilePath, e.g "/var/lib/dhcpc/dhcpcd-eth0.info"
# $2 = "up" if interface has been configured with the same
# IP address as before reboot;
# $2 = "down" if interface has been shut down;
# $2 = "new" if interface has been configured with new IP address;
# $3 (optional) = "-d" debug flag passed if dhcpcd daemon has been
# invoked with "-d" flag
#
# This script sources /var/lib/dhcpc/dhcpcd-<interface>.info which defines
# a set of variables.
# NOTE THAT THE DATA IN SOME OF THESE VARIABLES COME FROM
# UNTRUSTED SOURCES AND ARE UNCHECKED.
# The variables in question are HOSTNAME, DOMAIN, NISDOMAIN,
# ROOTPATH DNSSEARCH and DHCPSNAME. Enough quoting is done to ensure that
# execution of this script is safe, but beware if you pass the value of any of
# these variables to another shell or perl script - there is nothing to
# stop an attacker putting dangerous characters in these variables.
#
# This is important: if noglob not set a filename expansion metachar may be
# included in one of the variables set in the info file and executed
# if that variable is used.
# Try this to see the effect:
# TEST='*'; echo $TEST
set -o noglob
# Sanity checks
if [ $# -lt 2 ]; then
logger -s -p local0.err -t dhcpcd.exe "wrong usage"
exit 1
fi
hostinfo="$1"
state="$2"
debug="$3"
# Reading HostInfo file for configuration parameters
if ! [ -f ${hostinfo} ]; then
logger -s -p local0.err -t dhcpcd.exe "No hostinfo file"
exit 1
fi
. ${hostinfo}
write_resolv_info()
{
dnsservs=${DNS//,/ }
r=""
[ "$dnsservs" != "" ] && [ "$DNSSEARCH" != "" ] && r="${r}search $DNSSEARCH
"
[ "$dnsservs" != "" ] && [ "$DNSSEARCH" == "" ] && [ "$DOMAIN" != "" ] && r="${r}search $DOMAIN
"
for serv in $dnsservs; do
r="${r}nameserver $serv
"
done
if [ -x /sbin/resolvconf ] ; then
echo -n "$r" | /sbin/resolvconf -a "$INTERFACE"
else
# set /etc/dhcpc/resolv.conf for compatiblity with older packages
echo -n "$r" >| /etc/dhcpc/resolv.conf
chmod 644 /etc/dhcpc/resolv.conf
fi
}
delete_resolv_info()
{
if [ -x /sbin/resolvconf ] ; then
/sbin/resolvconf -d "$INTERFACE"
fi
}
case ${INTERFACE} in
eth*) ;;
wlan*) ;;
*) logger -s -p local0.err -t dhcpcd.exe "wrong interface name \"${INTERFACE}\""
exit 1
;;
esac
case ${state} in
up) logger -s -p local0.info -t dhcpcd.exe "interface ${INTERFACE} has been configured with old IP=${IPADDR}"
write_resolv_info
# ==== Put your code for the case interface has been brought up with old IP address here
# ==== End
;;
new) logger -s -p local0.info -t dhcpcd.exe "interface ${INTERFACE} has been configured with new IP=${IPADDR}"
write_resolv_info
# ==== Put your code for the case interface has been brought up with new IP address here
# ==== End
;;
down) logger -s -p local0.info -t dhcpcd.exe "interface ${INTERFACE} has been brought down"
delete_resolv_info
# ==== Put your code for the case interface has been shut down here
# ==== End
;;
esac
exit 0
|