dhcp: fork in background

tinc-up

@@ -68,14 +68,24 @@ set_ip() {
   fi
 }
 
+start_dhclient() {
+  local interface=$1
+  if [[ "$OSTYPE" == "linux-gnu"  ]]; then
+    dhclient -nw "$interface"
+  elif [[ "$OSTYPE" == "freebsd"* ]]; then
+    dhclient -b "$interface"
+  else
+    nohup setsid dhclient "$interface" >/dev/null 2>&1
+  fi
+}
+
 start_dhcp() {
   local interface=$1
   if has dhcpcd; then
-    dhcpcd "$interface"
+    dhcpcd -b -n "$interface"
   elif has dhclient; then
-    dhclient "$interface"
-  elif [[ "$OSTYPE" == "darwin"* ]]; then # TODO
-    untested
+    start_dhclient "$interface"
+  elif [[ "$OSTYPE" == "darwin"* ]]; then # TODO untested
     ipconfig set "$interface" DHCP
   else
     die "no suitable dhcp program found, need dhcpcd or dhclient"