rtpproxy: add iface translation to init

rtpproxy expects IPs as parameters. Lots of OpenWrt devices use
connections where the IP is dynamically assigned. This commit adds shell
functions to convert an iface like 'wan' to an IP address before adding
the parameter to the rtpproxy command line.

Explanation is provided in /etc/config/rtpproxy. Some whitespace issues
were also fixed.

Signed-off-by: Sebastian Kemper <sebastian_ml@gmx.net>

net/rtpproxy/Makefile

@@ -10,7 +10,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=rtpproxy
 PKG_VERSION:=2.1.0-20170914
-PKG_RELEASE:=2
+PKG_RELEASE:=3
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL:=https://github.com/sippy/rtpproxy.git

net/rtpproxy/files/rtpproxy.config

@@ -2,7 +2,7 @@ config rtpproxy global
 	option enabled 0						# 0 - disabled, 1 - enabled
 
 config instance 'site1'
-        option socket 'udp:127.0.0.1:7723'				# socket
+	option socket 'udp:127.0.0.1:7723'				# socket
 	option ipaddr '127.0.0.1'					# IPv4 address
 	option ip6addr '2001:0db8:0000:0000:0000:0000:1428:57ab'	# IPv6 address
 	option user 'nobody'						# userid to run rtpproxy instance from
@@ -10,9 +10,13 @@ config instance 'site1'
 	option opts ''							# additional options for rtpproxy instance
 
 config instance 'site2'
-        option socket 'udp:127.0.0.1:7724'
+	option socket 'udp:127.0.0.1:7724'
-	option ipaddr '192.168.1.1'
+	option ipaddr 'lan/wan'						# Bridge mode. 'lan' and 'wan' will be
-	option log_level 'DBUG'
+	option user 'nobody'						# translated to IPv4 addresses by init
+	option log_level 'DBUG'						# script. Handy if using dynamic IPs. Can
+	option opts ''							# also be used with single interfaces.
+									# Translation for both 'ipaddr' and
+									# 'ip6addr' supported.
 
 config rtpproxy 'hotplug'
 	#option interface 'wan'						# uncomment to enable hotplug

net/rtpproxy/files/rtpproxy.init

@@ -28,6 +28,48 @@ run_instance() {
 	$LOGGER instance $2 has started
 }
 
+check_ip() {
+	local tmp_addr
+
+	if [ "$1" = "ipaddr" ]; then
+		network_get_ipaddr tmp_addr "$2" || tmp_addr="$2"
+	else
+		network_get_ipaddr6 tmp_addr "$2" || tmp_addr="$2"
+	fi
+
+	echo "$tmp_addr"
+}
+
+check_ipaddr() {
+	local value="$1"
+	local type="$2"
+	local param="$3"
+	local one two
+
+	[ -z "$value" ] && {
+		$LOG_ERR empty $type entry
+		exit 1
+	}
+
+	# Bail if more than 1 slash.
+	[ $(echo "$value" | awk -F "/" '{print NF-1}') -gt 1 ] && {
+		$LOG_ERR init script does not understand $type entry \""$value"\"
+		exit 1
+	}
+
+	IFS="/" read one two << EOF
+$value
+EOF
+
+	one="$(check_ip "$type" "$one")"
+	if [ -n "$two" ]; then
+		two="$(check_ip "$type" "$two")"
+		rtpproxy_options=$rtpproxy_options" $param $one/$two"
+	else
+		rtpproxy_options=$rtpproxy_options" $param $one"
+	fi
+}
+
 check_param() {
 	local param="$1"
 	local value="$2"
@@ -62,13 +104,14 @@ handle_instance() {
 	config_get log_level	"$site" log_level
 
 	check_param "-s" "$socket"
-	check_param "-l" "$ipaddr"
-	check_param "-6" "$ip6addr"
 	check_param "-u" "$user"	"nobody"
 	check_param "-d" "$log_level"	"DBUG"
 
 	check_special_param "$opts"
 
+	[ -n "$ipaddr" ]	&& check_ipaddr "$ipaddr"	ipaddr	'-l'
+	[ -n "$ip6addr" ]	&& check_ipaddr "$ip6addr"	ip6addr	'-6'
+
 	run_instance "$rtpproxy_options" "$site"
 }
 
@@ -80,6 +123,7 @@ start_service() {
 	config_get_bool enabled global enabled 0
 
 	if [ "$enabled" -eq 1 ]; then
+		. /lib/functions/network.sh
 		config_foreach handle_instance instance
 	else
 		$LOG_ERR service not enabled