From: Hans Dedecker <dedeckeh@gmail.com>
Date: Wed, 12 Oct 2016 08:33:16 +0000 (+0200)
Subject: dnsmasq: Multiple dnsmasq instances support
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=a35f9bbc43c3da06eed042f80dc09e8c1da681b4;p=openwrt%2Fstaging%2Fthess.git

dnsmasq: Multiple dnsmasq instances support

Adds support in uci for configuring multiple dnsmasq instances via
multiple dnsmasq sections.
The uci sections host, boot, mac, tag, vendorclass, userclass,
circuitid, ... will refer to a dnsmasq instance via the instance
parameter defined in the section; if the instance parameter is
not specified backwards compatibility is preserved.

Start/Stopping a dnsmasq instance can be achieved by passing the
dnsmasq instance name as argument to start/stop via the init script.

Multiple dnsmasq instances is usefull in scenarios where you want to
bind a dnsmasq instance to an interface in order to isolate networks.

This patch is a rework of a multiple dnsmasq instance patch by Daniel Dickinson

Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>
---

diff --git a/package/network/services/dnsmasq/files/dnsmasq.init b/package/network/services/dnsmasq/files/dnsmasq.init
index 69c375c395..6f5ccfeae4 100644
--- a/package/network/services/dnsmasq/files/dnsmasq.init
+++ b/package/network/services/dnsmasq/files/dnsmasq.init
@@ -6,18 +6,15 @@ START=19
 USE_PROCD=1
 PROG=/usr/sbin/dnsmasq
 
-DNS_SERVERS=""
-DOMAIN=""
-
 ADD_LOCAL_DOMAIN=1
 ADD_LOCAL_HOSTNAME=1
 
-CONFIGFILE="/var/etc/dnsmasq.conf"
-CONFIGFILE_TMP="/var/etc/dnsmasq.conf.$$"
-HOSTFILE="/tmp/hosts/dhcp"
+BASECONFIGFILE="/var/etc/dnsmasq.conf"
+BASEHOSTFILE="/tmp/hosts/dhcp"
+BASETIMESTAMPFILE="/etc/dnsmasq.time"
 TRUSTANCHORSFILE="/usr/share/dnsmasq/trust-anchors.conf"
-TIMESTAMPFILE="/etc/dnsmasq.time"
 TIMEVALIDFILE="/var/state/dnsmasqsec"
+BASEDHCPSTAMPFILE="/var/run/dnsmasq"
 
 xappend() {
 	local value="$1"
@@ -59,7 +56,7 @@ dhcp_calc() {
 
 dhcp_check() {
 	local ifname="$1"
-	local stamp="/var/run/dnsmasq.$ifname.dhcp"
+	local stamp="${BASEDHCPSTAMPFILE_CFG}.${ifname}.dhcp"
 	local rv=0
 
 	[ -s "$stamp" ] && return $(cat "$stamp")
@@ -140,135 +137,14 @@ append_pxe_service() {
 	xappend "--pxe-service=$1"
 }
 
-dnsmasq() {
-	local cfg="$1"
-	append_bool "$cfg" authoritative "--dhcp-authoritative"
-	append_bool "$cfg" nodaemon "--no-daemon"
-	append_bool "$cfg" domainneeded "--domain-needed"
-	append_bool "$cfg" filterwin2k "--filterwin2k"
-	append_bool "$cfg" nohosts "--no-hosts"
-	append_bool "$cfg" nonegcache "--no-negcache"
-	append_bool "$cfg" strictorder "--strict-order"
-	append_bool "$cfg" logqueries "--log-queries=extra"
-	append_bool "$cfg" noresolv "--no-resolv"
-	append_bool "$cfg" localise_queries "--localise-queries"
-	append_bool "$cfg" readethers "--read-ethers"
-	append_bool "$cfg" dbus "--enable-dbus"
-	append_bool "$cfg" boguspriv "--bogus-priv"
-	append_bool "$cfg" expandhosts "--expand-hosts"
-	config_get tftp_root "$cfg" "tftp_root"
-	[ -d "$tftp_root" ] && append_bool "$cfg" enable_tftp "--enable-tftp"
-	append_bool "$cfg" tftp_no_fail "--tftp-no-fail"
-	append_bool "$cfg" nonwildcard "--bind-dynamic"
-	append_bool "$cfg" fqdn "--dhcp-fqdn"
-	append_bool "$cfg" proxydnssec "--proxy-dnssec"
-	append_bool "$cfg" localservice "--local-service"
-	append_bool "$cfg" quietdhcp "--quiet-dhcp"
-	append_bool "$cfg" sequential_ip "--dhcp-sequential-ip"
-	append_bool "$cfg" allservers "--all-servers"
-	append_bool "$cfg" noping "--no-ping"
+filter_dnsmasq() {
+	local cfg="$1" func="$2" match_cfg="$3" found_cfg
 
-	append_parm "$cfg" dhcpscript "--dhcp-script"
-	append_parm "$cfg" cachesize "--cache-size"
-	append_parm "$cfg" dnsforwardmax "--dns-forward-max"
-	append_parm "$cfg" port "--port"
-	append_parm "$cfg" ednspacket_max "--edns-packet-max"
-	append_parm "$cfg" dhcpleasemax "--dhcp-lease-max"
-	append_parm "$cfg" "queryport" "--query-port"
-	append_parm "$cfg" "minport" "--min-port"
-	append_parm "$cfg" "maxport" "--max-port"
-	append_parm "$cfg" "domain" "--domain"
-	append_parm "$cfg" "local" "--server"
-	config_list_foreach "$cfg" "server" append_server
-	config_list_foreach "$cfg" "address" append_address
-	config_list_foreach "$cfg" "ipset" append_ipset
-	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 "$cfg" "leasefile" "--dhcp-leasefile" "/tmp/dhcp.leases"
-	append_parm "$cfg" "resolvfile" "--resolv-file" "/tmp/resolv.conf.auto"
-	append_parm "$cfg" "serversfile" "--servers-file"
-	append_parm "$cfg" "tftp_root" "--tftp-root"
-	append_parm "$cfg" "dhcp_boot" "--dhcp-boot"
-	append_parm "$cfg" "local_ttl" "--local-ttl"
-	append_parm "$cfg" "pxe_prompt" "--pxe-prompt"
-	config_list_foreach "$cfg" "pxe_service" append_pxe_service
-	config_get DOMAIN "$cfg" domain
-
-	config_get_bool ADD_LOCAL_DOMAIN "$cfg" add_local_domain 1
-	config_get_bool ADD_LOCAL_HOSTNAME "$cfg" add_local_hostname 1
-
-	config_get_bool readethers "$cfg" readethers
-	[ "$readethers" = "1" -a \! -e "/etc/ethers" ] && touch /etc/ethers
-
-	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 "$resolvfile"
+	# use entry when no instance entry set, or if it matches
+	config_get found_cfg "$cfg" "instance"
+	if [ -z "$found_cfg" -o "$found_cfg" = "$match_cfg" ]; then
+		$func $cfg
 	fi
-
-	config_get hostsfile "$cfg" dhcphostsfile
-	[ -e "$hostsfile" ] && xappend "--dhcp-hostsfile=$hostsfile"
-
-	local rebind
-	config_get_bool rebind "$cfg" rebind_protection 1
-	[ $rebind -gt 0 ] && {
-		log_once \
-			"DNS rebinding protection is active," \
-			"will discard upstream RFC1918 responses!"
-		xappend "--stop-dns-rebind"
-
-		local rebind_localhost
-		config_get_bool rebind_localhost "$cfg" rebind_localhost 0
-		[ $rebind_localhost -gt 0 ] && {
-			log_once "Allowing 127.0.0.0/8 responses"
-			xappend "--rebind-localhost-ok"
-		}
-
-		append_rebind_domain() {
-			log_once "Allowing RFC1918 responses for domain $1"
-			xappend "--rebind-domain-ok=$1"
-		}
-
-		config_list_foreach "$cfg" rebind_domain append_rebind_domain
-	}
-
-	config_get_bool dnssec "$cfg" dnssec 0
-	[ "$dnssec" -gt 0 ] && {
-		xappend "--conf-file=$TRUSTANCHORSFILE"
-		xappend "--dnssec"
-		[ -x /etc/init.d/sysntpd ] && {
-			/etc/init.d/sysntpd enabled
-			[ "$?" -ne 0 -o "$(uci_get system.ntp.enabled)" = "1" ] && {
-				[ -f "$TIMEVALIDFILE" ] || xappend "--dnssec-no-timecheck"
-			}
-		}
-		append_bool "$cfg" dnsseccheckunsigned "--dnssec-check-unsigned"
-	}
-
-	dhcp_option_add "$cfg" "" 0
-
-	xappend "--dhcp-broadcast=tag:needs-broadcast"
-
-	mkdir -p /tmp/hosts /tmp/dnsmasq.d
-	xappend "--addn-hosts=/tmp/hosts"
-	xappend "--conf-dir=/tmp/dnsmasq.d"
-	xappend "--user=dnsmasq"
-	xappend "--group=dnsmasq"
-
-	echo >> $CONFIGFILE_TMP
-
-	config_get_bool enable_tftp "$cfg" enable_tftp 0
-	[ "$enable_tftp" -gt 0 ] && {
-		config_get tftp_root "$cfg" tftp_root
-		append EXTRA_MOUNT $tftp_root
-	}
 }
 
 dhcp_subscrid_add() {
@@ -635,30 +511,27 @@ dhcp_relay_add() {
 	fi
 }
 
-service_triggers()
-{
-	procd_add_reload_trigger "dhcp"
-	procd_add_raw_trigger "interface.*" 2000 /etc/init.d/dnsmasq reload
-}
-
-boot()
+dnsmasq_start()
 {
-	BOOT=1
-	start "$@"
-}
+	local cfg="$1" disabled
 
-start_service() {
-	[ -n "$BOOT" ] && return
+	config_get_bool disabled "$cfg" disabled 0
+	[ "$disabled" -gt 0 ] && return 0
 
-	include /lib/functions
-
-	config_load dhcp
+	# reset list of DOMAINS and DNS servers (for each dnsmasq instance)
+	DNS_SERVERS=""
+	DOMAIN=""
+	CONFIGFILE="${BASECONFIGFILE}.${cfg}"
+	CONFIGFILE_TMP="${CONFIGFILE}.$$"
+	HOSTFILE="${BASEHOSTFILE}.${cfg}"
+	TIMESTAMPFILE="${BASETIMESTAMPFILE}.${cfg}"
+	BASEDHCPSTAMPFILE_CFG="${BASEDHCPSTAMPFILE}.${cfg}"
 
 	# before we can call xappend
 	mkdir -p /var/run/dnsmasq/
 	mkdir -p $(dirname $CONFIGFILE)
+	mkdir -p $(dirname $HOSTFILE)
 	mkdir -p /var/lib/misc
-	touch /tmp/dhcp.leases
 	chown dnsmasq:dnsmasq /var/run/dnsmasq
 
 	[ -f "$TIMESTAMPFILE" ] && rm -f "$TIMESTAMPFILE"
@@ -673,22 +546,152 @@ start_service() {
 
 	$PROG --version | grep -osqE "^Compile time options:.* DHCPv6( |$)" && DHCPv6CAPABLE=1 || DHCPv6CAPABLE=0
 
-	args=""
-	config_foreach dnsmasq dnsmasq
-	config_foreach dhcp_host_add host
+	append_bool "$cfg" authoritative "--dhcp-authoritative"
+	append_bool "$cfg" nodaemon "--no-daemon"
+	append_bool "$cfg" domainneeded "--domain-needed"
+	append_bool "$cfg" filterwin2k "--filterwin2k"
+	append_bool "$cfg" nohosts "--no-hosts"
+	append_bool "$cfg" nonegcache "--no-negcache"
+	append_bool "$cfg" strictorder "--strict-order"
+	append_bool "$cfg" logqueries "--log-queries=extra"
+	append_bool "$cfg" noresolv "--no-resolv"
+	append_bool "$cfg" localise_queries "--localise-queries"
+	append_bool "$cfg" readethers "--read-ethers"
+	append_bool "$cfg" dbus "--enable-dbus"
+	append_bool "$cfg" boguspriv "--bogus-priv"
+	append_bool "$cfg" expandhosts "--expand-hosts"
+	config_get tftp_root "$cfg" "tftp_root"
+	[ -d "$tftp_root" ] && append_bool "$cfg" enable_tftp "--enable-tftp"
+	append_bool "$cfg" tftp_no_fail "--tftp-no-fail"
+	append_bool "$cfg" nonwildcard "--bind-dynamic"
+	append_bool "$cfg" fqdn "--dhcp-fqdn"
+	append_bool "$cfg" proxydnssec "--proxy-dnssec"
+	append_bool "$cfg" localservice "--local-service"
+	append_bool "$cfg" quietdhcp "--quiet-dhcp"
+	append_bool "$cfg" sequential_ip "--dhcp-sequential-ip"
+	append_bool "$cfg" allservers "--all-servers"
+	append_bool "$cfg" noping "--no-ping"
+
+	append_parm "$cfg" dhcpscript "--dhcp-script"
+	append_parm "$cfg" cachesize "--cache-size"
+	append_parm "$cfg" dnsforwardmax "--dns-forward-max"
+	append_parm "$cfg" port "--port"
+	append_parm "$cfg" ednspacket_max "--edns-packet-max"
+	append_parm "$cfg" dhcpleasemax "--dhcp-lease-max"
+	append_parm "$cfg" "queryport" "--query-port"
+	append_parm "$cfg" "minport" "--min-port"
+	append_parm "$cfg" "maxport" "--max-port"
+	append_parm "$cfg" "domain" "--domain"
+	append_parm "$cfg" "local" "--server"
+	config_list_foreach "$cfg" "server" append_server
+	config_list_foreach "$cfg" "address" append_address
+	config_list_foreach "$cfg" "ipset" append_ipset
+	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 "$cfg" "leasefile" "--dhcp-leasefile" "/tmp/dhcp.leases"
+	append_parm "$cfg" "resolvfile" "--resolv-file" "/tmp/resolv.conf.auto"
+	append_parm "$cfg" "serversfile" "--servers-file"
+	append_parm "$cfg" "tftp_root" "--tftp-root"
+	append_parm "$cfg" "dhcp_boot" "--dhcp-boot"
+	append_parm "$cfg" "local_ttl" "--local-ttl"
+	append_parm "$cfg" "pxe_prompt" "--pxe-prompt"
+	config_list_foreach "$cfg" "pxe_service" append_pxe_service
+	config_get DOMAIN "$cfg" domain
+
+	config_get_bool ADD_LOCAL_DOMAIN "$cfg" add_local_domain 1
+	config_get_bool ADD_LOCAL_HOSTNAME "$cfg" add_local_hostname 1
+
+	config_get_bool readethers "$cfg" readethers
+	[ "$readethers" = "1" -a \! -e "/etc/ethers" ] && touch /etc/ethers
+
+	config_get resolvfile $cfg resolvfile
+	config_get dhcpscript $cfg dhcpscript
+
+	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"
+
+	local rebind
+	config_get_bool rebind "$cfg" rebind_protection 1
+	[ $rebind -gt 0 ] && {
+		log_once \
+			"DNS rebinding protection is active," \
+			"will discard upstream RFC1918 responses!"
+		xappend "--stop-dns-rebind"
+
+		local rebind_localhost
+		config_get_bool rebind_localhost "$cfg" rebind_localhost 0
+		[ $rebind_localhost -gt 0 ] && {
+			log_once "Allowing 127.0.0.0/8 responses"
+			xappend "--rebind-localhost-ok"
+		}
+
+		append_rebind_domain() {
+			log_once "Allowing RFC1918 responses for domain $1"
+			xappend "--rebind-domain-ok=$1"
+		}
+
+		config_list_foreach "$cfg" rebind_domain append_rebind_domain
+	}
+
+	config_get_bool dnssec "$cfg" dnssec 0
+	[ "$dnssec" -gt 0 ] && {
+		xappend "--conf-file=$TRUSTANCHORSFILE"
+		xappend "--dnssec"
+		[ -x /etc/init.d/sysntpd ] && {
+			/etc/init.d/sysntpd enabled
+			[ "$?" -ne 0 -o "$(uci_get system.ntp.enabled)" = "1" ] && {
+				[ -f "$TIMEVALIDFILE" ] || xappend "--dnssec-no-timecheck"
+			}
+		}
+		append_bool "$cfg" dnsseccheckunsigned "--dnssec-check-unsigned"
+	}
+
+	dhcp_option_add "$cfg" "" 0
+
+	xappend "--dhcp-broadcast=tag:needs-broadcast"
+
+	xappend "--addn-hosts=$HOSTFILE"
+
+	config_get dnsmasqconfdir "$cfg" confdir "/tmp/dnsmasq.d"
+	[ ! -d "$dnsmasqconfdir" ] && mkdir -p $dnsmasqconfdir
+	xappend "--conf-dir=$dnsmasqconfdir"
+	xappend "--user=dnsmasq"
+	xappend "--group=dnsmasq"
+	echo >> $CONFIGFILE_TMP
+
+	config_get_bool enable_tftp "$cfg" enable_tftp 0
+	[ "$enable_tftp" -gt 0 ] && {
+		config_get tftp_root "$cfg" tftp_root
+		append EXTRA_MOUNT $tftp_root
+	}
+
+	config_foreach filter_dnsmasq host dhcp_host_add "$cfg"
 	echo >> $CONFIGFILE_TMP
-	config_foreach dhcp_boot_add boot
-	config_foreach dhcp_mac_add mac
-	config_foreach dhcp_tag_add tag
-	config_foreach dhcp_vendorclass_add vendorclass
-	config_foreach dhcp_userclass_add userclass
-	config_foreach dhcp_circuitid_add circuitid
-	config_foreach dhcp_remoteid_add remoteid
-	config_foreach dhcp_subscrid_add subscrid
-	config_foreach dhcp_match_add match
-	config_foreach dhcp_domain_add domain
-	config_foreach dhcp_hostrecord_add hostrecord
-	config_foreach dhcp_relay_add relay
+	config_foreach filter_dnsmasq boot dhcp_boot_add "$cfg"
+	config_foreach filter_dnsmasq mac dhcp_mac_add "$cfg"
+	config_foreach filter_dnsmasq tag dhcp_tag_add "$cfg"
+	config_foreach filter_dnsmasq vendorclass dhcp_vendorclass_add "$cfg"
+	config_foreach filter_dnsmasq userclass dhcp_userclass_add "$cfg"
+	config_foreach filter_dnsmasq circuitid dhcp_circuitid_add "$cfg"
+	config_foreach filter_dnsmasq remoteid dhcp_remoteid_add "$cfg"
+	config_foreach filter_dnsmasq subscrid dhcp_subscrid_add "$cfg"
+	config_foreach filter_dnsmasq match dhcp_match_add "$cfg"
+	config_foreach filter_dnsmasq domain dhcp_domain_add "$cfg"
+	config_foreach filter_dnsmasq hostrecord dhcp_hostrecord_add "$cfg"
+	config_foreach filter_dnsmasq relay dhcp_relay_add "$cfg"
 
 	# add own hostname
 	[ $ADD_LOCAL_HOSTNAME -eq 1 ] && {
@@ -712,50 +715,132 @@ start_service() {
 	}
 
 	echo >> $CONFIGFILE_TMP
-	config_foreach dhcp_srv_add srvhost
-	config_foreach dhcp_mx_add mxhost
+	config_foreach filter_dnsmasq srvhost dhcp_srv_add "$cfg"
+	config_foreach filter_dnsmasq mxhost dhcp_mx_add "$cfg"
 	echo >> $CONFIGFILE_TMP
 
 	config_get odhcpd_is_active odhcpd maindhcp
 	if [ "$odhcpd_is_active" != "1" ]; then
-		config_foreach dhcp_add dhcp
+		config_foreach filter_dnsmasq dhcp dhcp_add "$cfg"
 	fi
 
 	echo >> $CONFIGFILE_TMP
-	config_foreach dhcp_cname_add cname
+	config_foreach filter_dnsmasq cname dhcp_cname_add "$cfg"
+	echo >> $CONFIGFILE_TMP
+
 	echo >> $CONFIGFILE_TMP
 	mv -f $CONFIGFILE_TMP $CONFIGFILE
 
-	rm -f /tmp/resolv.conf
-	[ $ADD_LOCAL_DOMAIN -eq 1 ] && [ -n "$DOMAIN" ] && {
-		echo "search $DOMAIN" >> /tmp/resolv.conf
+	[ "$resolvfile" = "/tmp/resolv.conf.auto" ] && {
+		rm -f /tmp/resolv.conf
+		[ $ADD_LOCAL_DOMAIN -eq 1 ] && [ -n "$DOMAIN" ] && {
+			echo "search $DOMAIN" >> /tmp/resolv.conf
+		}
+		DNS_SERVERS="$DNS_SERVERS 127.0.0.1"
+		for DNS_SERVER in $DNS_SERVERS ; do
+			echo "nameserver $DNS_SERVER" >> /tmp/resolv.conf
+		done
 	}
-	DNS_SERVERS="$DNS_SERVERS 127.0.0.1"
-	for DNS_SERVER in $DNS_SERVERS ; do
-		echo "nameserver $DNS_SERVER" >> /tmp/resolv.conf
-	done
 
-	procd_open_instance
-	procd_set_param command $PROG -C $CONFIGFILE -k -x /var/run/dnsmasq/dnsmasq.pid
+	procd_open_instance $cfg
+	procd_set_param command $PROG -C $CONFIGFILE -k -x /var/run/dnsmasq/dnsmasq."${cfg}".pid
 	procd_set_param file $CONFIGFILE
 	procd_set_param respawn
 
+	local dnsmasqconffile="/etc/dnsmasq.${cfg}.conf"
+	if [ ! -r "$dnsmasqconffile" ]; then
+		dnsmasqconffile=/etc/dnsmasq.conf
+	fi
+
 	procd_add_jail dnsmasq ubus log
-	procd_add_jail_mount $CONFIGFILE $TRUSTANCHORSFILE $HOSTFILE /etc/passwd /etc/group /etc/TZ /dev/null /dev/urandom /etc/dnsmasq.conf /tmp/dnsmasq.d /tmp/resolv.conf.auto /etc/hosts /etc/ethers $EXTRA_MOUNT
-	procd_add_jail_mount_rw /var/run/dnsmasq/ /tmp/dhcp.leases
+	procd_add_jail_mount $CONFIGFILE $TRUSTANCHORSFILE $HOSTFILE /etc/passwd /etc/group /etc/TZ /dev/null /dev/urandom $dnsmasqconffile $dnsmasqconfdir $resolvfile $dhcpscript /etc/hosts /etc/ethers $EXTRA_MOUNT
+	procd_add_jail_mount_rw /var/run/dnsmasq/ $leasefile
 
 	procd_close_instance
 }
 
+dnsmasq_stop()
+{
+	local cfg="$1"
+
+	config_get resolvfile "$cfg" "resolvfile"
+
+	#relink /tmp/resolve.conf only for main instance
+	[ "$resolvfile" = "/tmp/resolv.conf.auto" ] && {
+		[ -f /tmp/resolv.conf ] && {
+			rm -f /tmp/resolv.conf
+			ln -s "$resolvfile" /tmp/resolv.conf
+		}
+	}
+
+	rm -f ${BASEDHCPSTAMPFILE}.${cfg}.*.dhcp
+}
+
+service_triggers()
+{
+	procd_add_reload_trigger "dhcp"
+	procd_add_raw_trigger "interface.*" 2000 /etc/init.d/dnsmasq reload
+}
+
+boot()
+{
+	BOOT=1
+	start "$@"
+}
+
+start_service() {
+	local instance="$1"
+	local instance_found=0
+
+	[ -n "$BOOT" ] && return
+
+	. /lib/functions/network.sh
+
+	config_cb() {
+		local type="$1"
+		local name="$2"
+		if [ "$type" = "dnsmasq" ]; then
+			if [ -n "$instance" -a "$instance" = "$name" ]; then
+				instance_found=1
+			fi
+		fi
+	}
+
+	config_load dhcp
+
+	if [ -n "$instance" ]; then
+		[ "$instance_found" -gt 0 ] || return
+		dnsmasq_start "$instance"
+	else
+		config_foreach dnsmasq_start dnsmasq
+	fi
+}
+
 reload_service() {
 	rc_procd start_service "$@"
 	return 0
 }
 
 stop_service() {
-	[ -f /tmp/resolv.conf ] && {
-		rm -f /tmp/resolv.conf
-		ln -s /tmp/resolv.conf.auto /tmp/resolv.conf
+	local instance="$1"
+	local instance_found=0
+
+	config_cb() {
+		local type="$1"
+		local name="$2"
+		if [ "$type" = "dnsmasq" ]; then
+			if [ -n "$instance" -a "$instance" = "$name" ]; then
+				instance_found=1
+			fi
+		fi
 	}
-	rm -f /var/run/dnsmasq.*.dhcp
+
+	config_load dhcp
+
+	if [ -n "$instance" ]; then
+		[ "$instance_found" -gt 0 ] || return
+		dnsmasq_stop "$instance"
+	else
+		config_foreach dnsmasq_stop dnsmasq
+	fi
 }