dnsmasq: Set the default dhcp lease file and resolv file

Instead of making assumptions about the leasefile and resolv file make sure
we use what the user configures, but fall back to defaults if no configuration
is specified

Signed-off-by: Daniel Dickinson <openwrt@daniel.thecshore.com>

package/network/services/dnsmasq/files/dnsmasq.init

@@ -72,8 +72,9 @@ append_parm() {
 	local section="$1"
 	local option="$2"
 	local switch="$3"
+	local default="$4"
 	local _loctmp
-	config_get _loctmp "$section" "$option"
+	config_get _loctmp "$section" "$option" "$default"
 	[ -z "$_loctmp" ] && return 0
 	xappend "$switch=$_loctmp"
 }
@@ -157,8 +158,8 @@ dnsmasq() {
 	config_list_foreach "$cfg" "notinterface" append_notinterface
 	config_list_foreach "$cfg" "addnhosts" append_addnhosts
 	config_list_foreach "$cfg" "bogusnxdomain" append_bogusnxdomain
-	append_parm "$cfg" "leasefile" "--dhcp-leasefile"
-	append_parm "$cfg" "resolvfile" "--resolv-file"
+	append_parm "$cfg" "leasefile" "--dhcp-leasefile" "/tmp/dhcp.leases"
+	append_parm "$cfg" "resolvfile" "--resolv-file" "/tmp/resolv.conf.auto"
 	append_parm "$cfg" "serversfile" "--servers-file"
 	append_parm "$cfg" "tftp_root" "--tftp-root"
 	append_parm "$cfg" "dhcp_boot" "--dhcp-boot"
@@ -173,10 +174,17 @@ dnsmasq() {
 	config_get_bool readethers "$cfg" readethers
 	[ "$readethers" = "1" -a \! -e "/etc/ethers" ] && touch /etc/ethers
 
-	config_get leasefile $cfg leasefile
+	config_get leasefile $cfg leasefile "/tmp/dhcp.leases"
 	[ -n "$leasefile" -a \! -e "$leasefile" ] && touch "$leasefile"
 	config_get_bool cachelocal "$cfg" cachelocal 1
 
+	config_get_bool noresolv "$cfg" noresolv 0
+	if [ "$noresolv" != "1" ]; then
+		config_get resolvfile "$cfg" resolvfile "/tmp/resolv.conf.auto"
+		# So jail doesn't complain if file missing
+		[ -n "$resolvfile" -a \! -e "$resolvfile" ] && touch "$resolvfile"
+	fi
+
 	config_get hostsfile "$cfg" dhcphostsfile
 	[ -e "$hostsfile" ] && xappend "--dhcp-hostsfile=$hostsfile"