dnsmasq: configure dnsmasq via flat config file and not command-line args

Sometimes it's useful to compare the generated config file from UCI config with a hand-edited dnsmasq config file, especially if you're migrating to an OpenWRT router from something else (such as Astlinux).

Putting the generated config makes it easier to capture and diff, etc.

Signed-off-by: Philip Prindeville <philipp@redfish-solutions.com>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@31182 3c298f89-4303-0410-b956-a3cf2f4a3e73

package/dnsmasq/files/dnsmasq.init

@@ -8,6 +8,14 @@ SERVICE_USE_PID=1
 DNS_SERVERS=""
 DOMAIN=""
 
+CONFIGFILE="/var/etc/dnsmasq.conf"
+
+xappend() {
+	local value="$1"
+
+	echo "${value#--}" >> $CONFIGFILE
+}
+
 dhcp_calc() {
 	local ip="$1"
 	local res=0
@@ -27,7 +35,7 @@ append_bool() {
 	local value="$3"
 	local _loctmp
 	config_get_bool _loctmp "$section" "$option" 0
-	[ $_loctmp -gt 0 ] && append args "$value"
+	[ $_loctmp -gt 0 ] && xappend "$value"
 }
 
 append_parm() {
@@ -37,66 +45,66 @@ append_parm() {
 	local _loctmp
 	config_get _loctmp "$section" "$option"
 	[ -z "$_loctmp" ] && return 0
-	append args "$switch $_loctmp"
+	xappend "$switch=$_loctmp"
 }
 
 append_server() {
-	append args "-S $1"
+	xappend "--server=$1"
 }
 
 append_interface() {
 	local ifname=$(uci_get_state network "$1" ifname "$1")
-	append args "-i $ifname"
+	xappend "--interface=$ifname"
 }
 
 append_notinterface() {
 	local ifname=$(uci_get_state network "$1" ifname "$1")
-	append args "-I $ifname"
+	xappend "--except-interface=$ifname"
 }
 
 append_addnhosts() {
-	append args "-H $1"
+	xappend "--addn-hosts=$1"
 }
 
 append_bogusnxdomain() {
-       append args "-B $1"
+       xappend "--bogus-nxdomain=$1"
 }
 
 dnsmasq() {
 	local cfg="$1"
-	append_bool "$cfg" authoritative "-K"
+	append_bool "$cfg" authoritative "--dhcp-authoritative"
-	append_bool "$cfg" nodaemon "-d"
+	append_bool "$cfg" nodaemon "--no-daemon"
-	append_bool "$cfg" domainneeded "-D"
+	append_bool "$cfg" domainneeded "--domain-needed"
-	append_bool "$cfg" filterwin2k "-f"
+	append_bool "$cfg" filterwin2k "--filterwin2k"
-	append_bool "$cfg" nohosts "-h"
+	append_bool "$cfg" nohosts "--no-hosts"
-	append_bool "$cfg" nonegcache "-N"
+	append_bool "$cfg" nonegcache "--no-negcache"
-	append_bool "$cfg" strictorder "-o"
+	append_bool "$cfg" strictorder "--strict-order"
-	append_bool "$cfg" logqueries "-q"
+	append_bool "$cfg" logqueries "--log-queries"
-	append_bool "$cfg" noresolv "-R"
+	append_bool "$cfg" noresolv "--no-resolv"
-	append_bool "$cfg" localise_queries "-y"
+	append_bool "$cfg" localise_queries "--localise-queries"
-	append_bool "$cfg" readethers "-Z"
+	append_bool "$cfg" readethers "--read-ethers"
-	append_bool "$cfg" dbus "-1"
+	append_bool "$cfg" dbus "--enable-dbus"
-	append_bool "$cfg" boguspriv "-b"
+	append_bool "$cfg" boguspriv "--bogus-priv"
-	append_bool "$cfg" expandhosts "-E"
+	append_bool "$cfg" expandhosts "--expand-hosts"
 	append_bool "$cfg" enable_tftp "--enable-tftp"
-	append_bool "$cfg" nonwildcard "-z"
+	append_bool "$cfg" nonwildcard "--bind-interfaces"
 
-	append_parm "$cfg" dhcpscript "-6"
+	append_parm "$cfg" dhcpscript "--dhcp-script"
-	append_parm "$cfg" cachesize "-c"
+	append_parm "$cfg" cachesize "--cache-size"
-	append_parm "$cfg" dnsforwardmax "-0"
+	append_parm "$cfg" dnsforwardmax "--dns-forward-max"
-	append_parm "$cfg" port "-p"
+	append_parm "$cfg" port "--port"
-	append_parm "$cfg" ednspacket_max "-P"
+	append_parm "$cfg" ednspacket_max "--edns-packet-max"
-	append_parm "$cfg" dhcpleasemax "-X"
+	append_parm "$cfg" dhcpleasemax "--dhcp-lease-max"
-	append_parm "$cfg" "queryport" "-Q"
+	append_parm "$cfg" "queryport" "--query-port"
-	append_parm "$cfg" "domain" "-s"
+	append_parm "$cfg" "domain" "--domain"
-	append_parm "$cfg" "local" "-S"
+	append_parm "$cfg" "local" "--server"
 	config_list_foreach "$cfg" "server" append_server
 	config_list_foreach "$cfg" "interface" append_interface
 	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" "-l"
+	append_parm "$cfg" "leasefile" "--dhcp-leasefile"
-	append_parm "$cfg" "resolvfile" "-r"
+	append_parm "$cfg" "resolvfile" "--resolv-file"
 	append_parm "$cfg" "tftp_root" "--tftp-root"
 	append_parm "$cfg" "dhcp_boot" "--dhcp-boot"
 
@@ -110,7 +118,7 @@ dnsmasq() {
 	config_get_bool cachelocal "$cfg" cachelocal 1
 
 	config_get hostsfile "$cfg" dhcphostsfile
-	[ -e "$hostsfile" ] && append args "--dhcp-hostsfile=$hostsfile"
+	[ -e "$hostsfile" ] && xappend "--dhcp-hostsfile=$hostsfile"
 
 	local rebind
 	config_get_bool rebind "$cfg" rebind_protection 1
@@ -118,22 +126,24 @@ dnsmasq() {
 		logger -t dnsmasq \
 			"DNS rebinding protection is active," \
 			"will discard upstream RFC1918 responses!"
-		append args "--stop-dns-rebind"
+		xappend "--stop-dns-rebind"
 
 		local rebind_localhost
 		config_get_bool rebind_localhost "$cfg" rebind_localhost 0
 		[ $rebind_localhost -gt 0 ] && {
 			logger -t dnsmasq "Allowing 127.0.0.0/8 responses"
-			append args "--rebind-localhost-ok"
+			xappend "--rebind-localhost-ok"
 		}
 
 		append_rebind_domain() {
 			logger -t dnsmasq "Allowing RFC1918 responses for domain $1"
-			append args "--rebind-domain-ok=$1"
+			xappend "--rebind-domain-ok=$1"
 		}
 
 		config_list_foreach "$cfg" rebind_domain append_rebind_domain
 	}
+
+	echo >> $CONFIGFILE
 }
 
 dhcp_subscrid_add() {
@@ -145,7 +155,7 @@ dhcp_subscrid_add() {
 	config_get subscriberid "$cfg" subscriberid
 	[ -n "$subscriberid" ] || return 0
 
-	append args "--dhcp-subscrid=$networkid,$subscriberid"
+	xappend "--dhcp-subscrid=$networkid,$subscriberid"
 
 	dhcp_option_add "$cfg" "$networkid"
 }
@@ -159,7 +169,7 @@ dhcp_remoteid_add() {
 	config_get remoteid "$cfg" remoteid
 	[ -n "$remoteid" ] || return 0
 
-	append args "--dhcp-remoteid=$networkid,$remoteid"
+	xappend "--dhcp-remoteid=$networkid,$remoteid"
 
 	dhcp_option_add "$cfg" "$networkid"
 }
@@ -173,7 +183,7 @@ dhcp_circuitid_add() {
 	config_get circuitid "$cfg" circuitid
 	[ -n "$circuitid" ] || return 0
 
-	append args "--dhcp-circuitid=$networkid,$circuitid"
+	xappend "--dhcp-circuitid=$networkid,$circuitid"
 
 	dhcp_option_add "$cfg" "$networkid"
 }
@@ -187,7 +197,7 @@ dhcp_userclass_add() {
 	config_get userclass "$cfg" userclass
 	[ -n "$userclass" ] || return 0
 
-	append args "--dhcp-userclass=$networkid,$userclass"
+	xappend "--dhcp-userclass=$networkid,$userclass"
 
 	dhcp_option_add "$cfg" "$networkid"
 }
@@ -201,7 +211,7 @@ dhcp_vendorclass_add() {
 	config_get vendorclass "$cfg" vendorclass
 	[ -n "$vendorclass" ] || return 0
 
-	append args "--dhcp-vendorclass=$networkid,$vendorclass"
+	xappend "--dhcp-vendorclass=$networkid,$vendorclass"
 
 	dhcp_option_add "$cfg" "$networkid"
 }
@@ -221,7 +231,7 @@ dhcp_host_add() {
 	for m in $mac; do append macs "$m" ","; done
 	[ -n "$macs" ] || return 0
 
-	append args "--dhcp-host=$macs${networkid:+,net:$networkid}${ip:+,$ip}${name:+,$name}"
+	xappend "--dhcp-host=$macs${networkid:+,net:$networkid}${ip:+,$ip}${name:+,$name}"
 }
 
 dhcp_mac_add() {
@@ -233,7 +243,7 @@ dhcp_mac_add() {
 	config_get mac "$cfg" mac
 	[ -n "$mac" ] || return 0
 
-	append args "--dhcp-mac=$networkid,$mac"
+	xappend "--dhcp-mac=$networkid,$mac"
 
 	dhcp_option_add "$cfg" "$networkid"
 }
@@ -252,7 +262,7 @@ dhcp_boot_add() {
 	config_get serveraddress "$cfg" serveraddress
 	[ -n "$serveraddress" ] || return 0
 
-	append args "--dhcp-boot=${networkid:+net:$networkid,}$filename,$servername,$serveraddress"
+	xappend "--dhcp-boot=${networkid:+net:$networkid,}$filename,$servername,$serveraddress"
 
 	dhcp_option_add "$cfg" "$networkid"
 }
@@ -274,7 +284,7 @@ dhcp_add() {
 		DNS_SERVERS="$DNS_SERVERS $dnsserver"
 	}
 
-	append_bool "$cfg" ignore "-2 $ifname" && return 0
+	append_bool "$cfg" ignore "--no-dhcp-interface=$ifname" && return 0
 
 	config_get proto "$net" proto
 	[ static = "$proto" ] || return 0
@@ -306,7 +316,7 @@ dhcp_add() {
 	[ "$limit" -gt 0 ] && limit=$((limit-1))
 	eval "$(ipcalc.sh $ipaddr $netmask $start $limit)"
 	if [ "$dynamicdhcp" = "0" ]; then END="static"; fi
-	append args "--dhcp-range=$networkid,$START,$END,$NETMASK,$leasetime${options:+ $options}"
+	xappend "--dhcp-range=$networkid,$START,$END,$NETMASK,$leasetime${options:+ $options}"
 
 	dhcp_option_add "$cfg" "$networkid"
 }
@@ -317,7 +327,7 @@ dhcp_option_add() {
 
 	config_get dhcp_option "$cfg" dhcp_option
 	for o in $dhcp_option; do
-		append args "-O $networkid","$o"
+		xappend "--dhcp-option=$networkid","$o"
 	done
 
 }
@@ -341,10 +351,10 @@ dhcp_domain_add() {
 		[ "${fqdn%.*}" == "$fqdn" ] && \
 			fqdn="$fqdn${DOMAIN:+.$DOMAIN}"
 
-		append args "-A /$fqdn/$ip"
+		xappend "--address=/$fqdn/$ip"
 
 		[ -n "$raddr" ] && {
-			append args "--ptr-record=$raddr,$fqdn"
+			xappend "--ptr-record=$raddr,$fqdn"
 			raddr=""
 		}
 	done
@@ -367,7 +377,7 @@ dhcp_srv_add() {
 
 	local service="$srv,$target,$port${class:+,$class${weight:+,$weight}}"
 
-	append args "-W $service"
+	xappend "--srv-host=$service"
 }
 
 dhcp_mx_add() {
@@ -397,7 +407,7 @@ dhcp_cname_add() {
 	config_get target "$cfg" target
 	[ -n "$target" ] || return 0
 
-	append args "--cname=${cname},${target}"
+	xappend "--cname=${cname},${target}"
 }
 
 start() {
@@ -409,9 +419,20 @@ start() {
 
 	config_load dhcp
 
+	# before we can call xappend
+	mkdir -p $(dirname $CONFIGFILE)
+
+	echo "# auto-generated config file from /etc/config/dhcp" > $CONFIGFILE
+
+	# if we did this last, we could override auto-generated config
+	[ -f /etc/dnsmasq.conf ] && {
+		xappend "--conf-file=/etc/dnsmasq.conf"
+	}
+
 	args=""
 	config_foreach dnsmasq dnsmasq
 	config_foreach dhcp_host_add host
+	echo >> $CONFIGFILE
 	config_foreach dhcp_boot_add boot
 	config_foreach dhcp_mac_add mac
 	config_foreach dhcp_vendorclass_add vendorclass
@@ -420,10 +441,14 @@ start() {
 	config_foreach dhcp_remoteid_add remoteid
 	config_foreach dhcp_subscrid_add subscrid
 	config_foreach dhcp_domain_add domain
+	echo >> $CONFIGFILE
 	config_foreach dhcp_srv_add srvhost
 	config_foreach dhcp_mx_add mxhost
+	echo >> $CONFIGFILE
 	config_foreach dhcp_add dhcp
+	echo >> $CONFIGFILE
 	config_foreach dhcp_cname_add cname
+	echo >> $CONFIGFILE
 
 	# add own hostname
 	[ -z "$lanaddr" ] || {
@@ -431,7 +456,7 @@ start() {
 		dhcp_domain_add "" "${hostname:-OpenWrt}" "$lanaddr"
 	}
 
-	service_start /usr/sbin/dnsmasq $args && {
+	service_start /usr/sbin/dnsmasq -C $CONFIGFILE && {
 		rm -f /tmp/resolv.conf
 		[ -n "$DOMAIN" ] && echo "search $DOMAIN" >> /tmp/resolv.conf
 		DNS_SERVERS="$DNS_SERVERS 127.0.0.1"