package/ssdp-responder: new package

Small (35k), and stand-alone, SSDP responder with built-in web server
(on port 1901) for serving description.xml when Windows scans for any
network devices on the LAN.  Also includes ssdp-scan (31k), similar to
the mdns-scan tool, to probe for SSDP capable devices.

Although it does not use fork(), it still fails to build on noMMU: lots
of missing function declarations, and lots of multicast-related structs
definitions, causing warnings like:

    ssdp-scan.c:57:12: warning: implicit declaration of function ‘strdup’; did you mean ‘strcmp’? [-Wimplicit-function-declaration]
    ssdp-scan.c:57:10: warning: assignment to ‘char *’ from ‘int’ makes pointer from integer without a cast [-Wint-conversion]

and errors like:

    ssdp.c:357:17: error: storage size of ‘imr’ isn’t known
    struct ip_mreq imr;
                   ^~~

Finding the root cause why those get not defined in MMU on uClibc is
quite a head-scratching, so let's just disablessdp-responder for noMMU
architectures.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
[yann.morin.1998@free.fr: extend commit log to explain noMMU state]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

DEVELOPERS

@@ -1280,6 +1280,7 @@ F:	configs/globalscale_espressobin_defconfig
 F:	board/globalscale/espressobin/
 F:	package/mg/
 F:	package/netcalc/
+F:	package/ssdp-responder/
 
 N:	Joao Pinto <jpinto@synopsys.com>
 F:	board/synopsys/vdk/

package/Config.in

@@ -2268,6 +2268,7 @@ endif
 	source "package/spice/Config.in"
 	source "package/spice-protocol/Config.in"
 	source "package/squid/Config.in"
+	source "package/ssdp-responder/Config.in"
 	source "package/sshguard/Config.in"
 	source "package/sshpass/Config.in"
 	source "package/sslh/Config.in"

package/ssdp-responder/Config.in

@@ -0,0 +1,20 @@
+config BR2_PACKAGE_SSDP_RESPONDER
+	bool "ssdp-responder"
+	depends on BR2_USE_MMU
+	help
+	  Simple Service Discovery Protocol daemon (SSDP) for networked
+	  Linux and UNIX devices. Useful in any setup, big or small, but
+	  targeted more at embedded systems that need to announce
+	  themselves to Windows systems.
+
+	  ssdpd is a stand-alone UNIX, no external dependencies but the
+	  standard C library.  It has a built-in web server for serving
+	  the UPnP XML description which Windows use to present the
+	  icon, by default an InternetGatewayDevice is announced.
+
+	  Also included is ssdp-scan, a tool similar to mdns-scan, which
+	  continuously scans for SSDP capable hosts on the network.
+	  Take care only to use for debugging since it scans the network
+	  quite aggressively.
+
+	  https://github.com/troglobit/ssdp-responder/

package/ssdp-responder/S50ssdpd

@@ -0,0 +1,42 @@
+#!/bin/sh
+
+NAME=ssdpd
+PIDFILE=/var/run/$NAME.pid
+DAEMON=/usr/sbin/$NAME
+CFGFILE=/etc/default/$NAME
+
+DAEMON_ARGS=""
+
+# Read configuration variable file if it is present
+[ -f $CFGFILE ] && . $CFGFILE
+
+start() {
+	printf 'Starting %s: ' "$NAME"
+	start-stop-daemon -S -q -p $PIDFILE -x $DAEMON -- $DAEMON_ARGS
+	[ $? = 0 ] && echo "OK" || echo "FAIL"
+}
+
+stop() {
+	printf 'Stopping %s: ' "$NAME"
+	start-stop-daemon -K -q -p $PIDFILE -x $DAEMON
+	[ $? = 0 ] && echo "OK" || echo "FAIL"
+}
+
+restart() {
+	stop
+	start
+}
+
+case "$1" in
+    start|stop|restart)
+	"$1"
+	;;
+    reload)
+	restart
+	;;
+    *)
+	echo "Usage: $0 {start|stop|restart|reload}"
+	exit 1
+esac
+
+exit $?

package/ssdp-responder/ssdp-responder.hash

@@ -0,0 +1,3 @@
+# Locally calculated
+sha256  7ae49229e7c7a55fed9e36598b12e2173eecef0fffe0a386b6a10fad30f3c79f  ssdp-responder-1.8.tar.gz
+sha256  e17dc0bc91bf499d8cca5e016c22c6d2a4770e3cc1a43756a7973375a83ddb90  LICENSE

package/ssdp-responder/ssdp-responder.mk

@@ -0,0 +1,31 @@
+################################################################################
+#
+# ssdp-responder
+#
+################################################################################
+
+SSDP_RESPONDER_VERSION = 1.8
+SSDP_RESPONDER_SITE = https://github.com/troglobit/ssdp-responder/releases/download/v$(SSDP_RESPONDER_VERSION)
+SSDP_RESPONDER_LICENSE = ISC
+SSDP_RESPONDER_LICENSE_FILES = LICENSE
+SSDP_RESPONDER_CPE_ID_VENDOR = troglobit
+SSDP_RESPONDER_DEPENDENCIES = host-pkgconf
+
+ifeq ($(BR2_PACKAGE_SYSTEMD),y)
+SSDP_RESPONDER_DEPENDENCIES += systemd
+SSDP_RESPONDER_CONF_OPTS += --with-systemd
+else
+SSDP_RESPONDER_CONF_OPTS += --without-systemd
+endif
+
+define SSDP_RESPONDER_INSTALL_INIT_SYSV
+	$(INSTALL) -D -m 0755 package/ssdp-responder/S50ssdpd \
+		$(TARGET_DIR)/etc/init.d/S50ssdpd
+endef
+
+define SSDP-RESPONDER_INSTALL_INIT_SYSTEMD
+	$(INSTALL) -D -m 644 $(@D)/ssdp-responder.service \
+		$(TARGET_DIR)/usr/lib/systemd/system/ssdp-responder.service
+endef
+
+$(eval $(autotools-package))