[OpenWrt-Devel] [PATCH] dnsmasq: support hostid ipv6 address suffix option
Kevin Darbyshire-Bryant
kevin at darbyshire-bryant.me.uk
Tue Sep 1 16:03:10 EDT 2015
Add support for hostid dhcp config entry to dnsmasq. This allows
specification of dhcpv6 hostid suffix and works in the same way as
odhcpd.
Entries in auto generated dnsmasq.conf should conform to:
dhcp-host=mm:mm:mm:mm:mm:mm,IPv4addr,[::V6:su:ff:ix],hostname
example based on sample config/dhcp entry:
config host
option name 'Kermit'
option mac 'E0:3F:49:A1:D4:AA'
option ip '192.168.235.4'
option hostid '4'
dhcp-host=E0:3F:49:A1:D4:AA,192.168.235.4,[::00:00:00:04],Kermit
Signed-off-by: Kevin Darbyshire-Bryant <kevin at darbyshire-bryant.me.uk>
---
Proper thanks to jow_laptop for lots of help with this
.../network/services/dnsmasq/files/dnsmasq.init | 29 +++++++++++++++++++++-
1 file changed, 28 insertions(+), 1 deletion(-)
diff --git a/package/network/services/dnsmasq/files/dnsmasq.init b/package/network/services/dnsmasq/files/dnsmasq.init
index ab64e88..58c301f 100644
--- a/package/network/services/dnsmasq/files/dnsmasq.init
+++ b/package/network/services/dnsmasq/files/dnsmasq.init
@@ -23,6 +23,27 @@ xappend() {
echo "${value#--}" >> $CONFIGFILE
}
+hex_to_hostid() {
+ local var="$1"
+ local hex="${2#0x}" # strip optional "0x" prefix
+
+ if [ -n "${hex//[0-9a-fA-F]/}" ]; then
+ # is invalid hex literal
+ return 1
+ fi
+
+ # convert into host id
+ export "$var=$(
+ printf "%02x:%02x:%02x:%02x\n" \
+ $(((0x$hex >> 24) % 256)) \
+ $(((0x$hex >> 16) % 256)) \
+ $(((0x$hex >> 8) % 256)) \
+ $(( 0x$hex % 256))
+ )"
+
+ return 0
+}
+
dhcp_calc() {
local ip="$1"
local res=0
@@ -329,10 +350,16 @@ dhcp_host_add() {
config_get tag "$cfg" tag
+ config_get hostid "$cfg" hostid
+
+ if [ -n "$hostid" ]; then
+ hex_to_hostid hostid "$hostid"
+ fi
+
config_get_bool broadcast "$cfg" broadcast 0
[ "$broadcast" = "0" ] && broadcast=
- xappend "--dhcp-host=$macs${networkid:+,net:$networkid}${broadcast:+,set:needs-broadcast}${tag:+,set:$tag}${ip:+,$ip}${name:+,$name}"
+ xappend "--dhcp-host=$macs${networkid:+,net:$networkid}${broadcast:+,set:needs-broadcast}${tag:+,set:$tag}${ip:+,$ip${hostid:+,[::$hostid]}}${name:+,$name}"
}
dhcp_tag_add() {
--
1.9.1
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