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