release/renew dhcp before start/before stop

tinc-down

@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+has() {
+  command -v "$1" >/dev/null 2>&1
+}
+
+stop_dhclient() {
+  local interface="$1"
+  local pid_file="/var/run/dhclient.${interface}.pid"
+  if [[ "$OSTYPE" == "linux-gnu" ]]; then
+    dhclient -r -x
+  elif [[ -f "$pid_file" ]
+    kill "$(< $pid_file)"
+  fi
+}
+
+if has dhcpcd; then
+ dhcpcd -k "$INTERFACE"
+elif has dhclient; then
+ stop_dhcpclient "$INTERFACE"
+elif [[ "$OSTYPE" == "darwin"* ]]; then # TODO untested
+  ipconfig set "$interface" NONE
+fi
+exit 0
+

tinc-up

@@ -67,6 +67,7 @@ set_ip() {
 start_dhclient() {
   local interface=$1
   if [[ "$OSTYPE" == "linux-gnu"  ]]; then
+    dhclient -x
     dhclient -nw "$interface"
   elif [[ "$OSTYPE" == "freebsd"* ]]; then
     dhclient -b "$interface"