From: Ralph Ronnquist <ralph.ronnquist@gmail.com>
Date: Tue, 23 Feb 2021 04:22:24 +0000 (+1100)
Subject: added dhclient control option
X-Git-Tag: 0.3.3~2
X-Git-Url: https://git.rrq.au/?a=commitdiff_plain;h=746fe0f6034ead5765d08ce4b12f0945f7b7e5de;p=rrq%2Frrqnet.git

added dhclient control option
---

diff --git a/rrqnet-ifupdown.sh b/rrqnet-ifupdown.sh
index 336c46d..6658929 100755
--- a/rrqnet-ifupdown.sh
+++ b/rrqnet-ifupdown.sh
@@ -24,6 +24,7 @@
 # rrqnet_options <options>
 # rrqnet_log <level> <pathname>
 # rrqnet_bridge <bridge>
+# rrqnet_dhcp <options>
 
 : ${RRQDAEMON:=/usr/local/sbin/rrqnet}
 : ${NAME:=rrqnet-${IFACE}}
@@ -41,6 +42,29 @@ configure_tap_up() {
 	grep -q "state UP" || ip link set dev $IFACE up
 }
 
+############################################################
+## DHCP support
+: ${LEASES:=/var/lib/dhcp/dhclient.$IFACE.leases}
+: ${DHCPARGS:="-4 -cf /dev/null"}
+: ${PIDFILE:=/var/run/dhclient.$IFACE}
+
+#function
+start_dhclient() {
+    shift 1
+    [ -z "$*" ] || DHCPARGS="$*"
+    /sbin/dhclient -pf $PIDFILE $DHCPARGS -lf $LEASES $IFACE
+}
+
+#function
+stop_dhclient() {
+    shift 1
+    [ -z "$*" ] || DHCPARGS="$*"
+    /sbin/dhclient -x -pf $PIDFILE $DHCPARGS -lf $LEASES $IFACE 2>/dev/null
+}
+
+############################################################
+## The action functions
+
 #function
 start_cable_pre_up() {
     configure_tap_up || return 1
@@ -48,26 +72,49 @@ start_cable_pre_up() {
     [ -z "$IF_RRQNET_NICE" ] || \
         RRQDAEMON="/usr/bin/nice -n $IF_RRQNET_NICE $RRQDAEMON"
     if [ -z "$IF_RRQNET_LOG" ] ; then
-	daemon -U -r -n $NAME -- \
+	daemon -U -r -a 10 -n $NAME -- \
 	       $RRQDAEMON $IF_RRQNET_OPTIONS \
 	       -t $IFACE $IF_RRQNET_PORT $IF_RRQNET_REMOTE
     else
-	daemon -U -r -n $NAME -E "${IF_RRQNET_LOG#* }" -- \
+	daemon -U -r -a 10 -n $NAME -E "${IF_RRQNET_LOG#* }" -- \
 	       $RRQDAEMON ${IF_RRQNET_LOG%% *} $IF_RRQNET_OPTIONS \
 	       -t $IFACE $IF_RRQNET_PORT $IF_RRQNET_REMOTE
     fi
 }
 
+#function
+start_cable_post_up() {
+    case "$IF_RRQNET_DHCP" in
+	dhclient*)
+	    start_dhclient IF_RRQNET_DHCP
+	    ;;
+	*)
+	    : # no or unkown dhcp option
+	    ;;
+    esac
+}
+
+#function
+stop_cable_pre_down() {
+    case "$IF_RRQNET_DHCP" in
+	dhclient*)
+	    stop_dhclient $IF_RRQNET_DHCP
+	    ;;
+	*)
+	    : # no or unkown dhcp option
+	    ;;
+    esac
+}
+
 #function
 stop_cable_post_down() {
     daemon -n $NAME --stop
 }
 
 # main script body
-
 case "$MODE-$PHASE" in
     start-pre-up) start_cable_pre_up ;;
-    start-post-up) : ;;
-    stop-pre-down) : ;;
+    start-post-up) start_cable_post_up ;;
+    stop-pre-down) stop_cable_pre_down ;;
     stop-post-down) stop_cable_post_down ;;
 esac
diff --git a/rrqnet-ifupdown.sh.8.adoc b/rrqnet-ifupdown.sh.8.adoc
index 98d1210..536cbc7 100644
--- a/rrqnet-ifupdown.sh.8.adoc
+++ b/rrqnet-ifupdown.sh.8.adoc
@@ -10,8 +10,9 @@ ifup and ifdown
 
 SYNOPSIS
 --------
- ln -s /etc/rrqnet/ifupdown.sh /etc/network/if-post-down.d/rrqnet
- ln -s /etc/rrqnet/ifupdown.sh /etc/network/if-pre-up.d/rrqnet
+ for HOOKD in down post-down pre-up up ; do
+     ln -s /etc/rrqnet/ifupdown.sh /etc/network/if-$HOOKD.d/rrqnet
+ done
 
 DESCRIPTION
 -----------
@@ -78,6 +79,20 @@ made a "port" of the nominated preceding +bridge+ interface. The same
 things is achieved by including the +tap+ in the +bridge_ports+ list
 of the bridge, provided that the +tap+ is created before the bridge.
 
+*rrqnet_dhcp* _method args_::
+
+This IFACE option is used for attaching a DHCP client to the
+interface. The +method+ identifies the DHCP client method, and
+currently only the +dhclient+ method is defined, which is run as
+follows:
++
+----
+dhclient -pf $PIDFILE $DHCPARGS -lf $LEASES $IFACE
+----
++
+The given +args+ if non-empty replaces +$DHCPARGS+, which by default
+are "-4 -cf /dev/null". Refer to the +dhclient+ man page for details.
+
 EXAMPLES
 --------
 
@@ -117,14 +132,20 @@ tunnel traffic. The tunnel packets will have a UDP header in addition
 to the orignal packet, which means that packets grow with some 28/48
 (ipv4/6) bytes.
 
+
 SEE ALSO
 --------
 
- *brctl(8)* - ethernet bridge administration
- *daemon(1)* - turns other processes into daemons
- *interfaces(5)* - network interface configuration for ifup and ifdown
- *rrqnet(8)* - packet tunneling over UDP, multiple channels
- 
+*brctl(8)* - ethernet bridge administration
+
+*daemon(1)* - turns other processes into daemons
+
+*dhclient(8)* - Dynamic Host Configuration Protocol Client
+
+*interfaces(5)* - network interface configuration for ifup and ifdown
+
+*rrqnet(8)* - packet tunneling over UDP, multiple channels
+
 AUTHOR
 ------
 Ralph Rönnquist <ralph.ronnquist@gmail.com>