gtphub: add to debian build

diff --git a/debian/control b/debian/control
index 2447d29..53b6908 100644
--- a/debian/control
+++ b/debian/control
@@ -50,6 +50,12 @@  Depends: ${shlibs:Depends}, ${misc:Depends}
 Description: Osmocom Base Station Controller Network Address Translation
  Network address translation for BSC.
 
+Package: osmocom-gtphub
+Architecture: any
+Depends: ${shlibs:Depends}, ${misc:Depends}
+Description: Osmocom GTP hub
+ Proxy for comms between SGSN and GGSN.
+
 Package: osmocom-bsc-dbg
 Architecture: any
 Section: debug
@@ -105,3 +111,11 @@  Priority: extra
 Depends: osmocom-bsc-nat (= ${binary:Version}), ${misc:Depends}
 Description: Debug symbols for the OpenBSC Network Address Translation
  Make debugging possible
+
+Package: osmocom-gtphub-dbg
+Architecture: any
+Section: debug
+Priority: extra
+Depends: osmocom-gtphub (= ${binary:Version}), ${misc:Depends}
+Description: Debug symbols for Osmocom GTP hub
+ Make debugging possible
diff --git a/debian/osmocom-gtphub.default b/debian/osmocom-gtphub.default
new file mode 100644
index 0000000..6af82da
--- /dev/null
+++ b/debian/osmocom-gtphub.default
@@ -0,0 +1,2 @@ 
+CONFIG_FILE="/etc/osmocom/osmo-gtphub.cfg"
+
diff --git a/debian/osmocom-gtphub.examples b/debian/osmocom-gtphub.examples
new file mode 100644
index 0000000..48c2dc0
--- /dev/null
+++ b/debian/osmocom-gtphub.examples
@@ -0,0 +1 @@ 
+openbsc/doc/examples/osmo-gtphub
diff --git a/debian/osmocom-gtphub.init b/debian/osmocom-gtphub.init
new file mode 100755
index 0000000..4dc67b3
--- /dev/null
+++ b/debian/osmocom-gtphub.init
@@ -0,0 +1,150 @@ 
+#!/bin/sh
+### BEGIN INIT INFO
+# Provides:          osmo-gtphub
+# Required-Start:    $network $local_fs
+# Required-Stop:
+# Default-Start:     2 3 4 5
+# Default-Stop:      0 1 6
+# Short-Description: Osmocom GTP hub
+# Description:       Osmocom GTP hub
+### END INIT INFO
+
+# Author: Neels Hofmeyr <nhofmeyr@sysmocom.de>
+
+# PATH should only include /usr/* if it runs after the mountnfs.sh script
+PATH=/sbin:/usr/sbin:/bin:/usr/bin
+NAME=osmo-gtphub                         # Introduce the short server's name here
+DESC="Osmocom GTP hub"                   # Introduce a short description here
+DAEMON=/usr/bin/osmo-gtphub              # Introduce the server's location here
+SCRIPTNAME=/etc/init.d/osmocom-gtphub
+
+# Exit if the package is not installed
+[ -x $DAEMON ] || exit 0
+
+# Read configuration variable file if it is present
+[ -r /etc/default/osmocom-gtphub ] && . /etc/default/osmocom-gtphub
+
+# Load the VERBOSE setting and other rcS variables
+. /lib/init/vars.sh
+
+# Define LSB log_* functions.
+# Depend on lsb-base (>= 3.0-6) to ensure that this file is present.
+. /lib/lsb/init-functions
+
+DAEMON_ARGS="$DAEMON_ARGS -D -c $CONFIG_FILE"
+
+#
+# Function that starts the daemon/service
+#
+do_start()
+{
+	# Return
+	#   0 if daemon has been started
+	#   1 if daemon was already running
+	#   2 if daemon could not be started
+	start-stop-daemon --start --quiet --exec $DAEMON --test > /dev/null \
+		|| return 1
+	start-stop-daemon --start --quiet --exec $DAEMON -- \
+		$DAEMON_ARGS \
+		|| return 2
+	# Add code here, if necessary, that waits for the process to be ready
+	# to handle requests from services started subsequently which depend
+	# on this one.  As a last resort, sleep for some time.
+}
+
+#
+# Function that stops the daemon/service
+#
+do_stop()
+{
+	# Return
+	#   0 if daemon has been stopped
+	#   1 if daemon was already stopped
+	#   2 if daemon could not be stopped
+	#   other if a failure occurred
+	start-stop-daemon --stop --quiet --retry=TERM/30/KILL/5 --name $NAME
+	RETVAL="$?"
+	[ "$RETVAL" = 2 ] && return 2
+	# Wait for children to finish too if this is a daemon that forks
+	# and if the daemon is only ever run from this initscript.
+	# If the above conditions are not satisfied then add some other code
+	# that waits for the process to drop all resources that could be
+	# needed by services started subsequently.  A last resort is to
+	# sleep for some time.
+	start-stop-daemon --stop --quiet --oknodo --retry=0/30/KILL/5 --exec $DAEMON
+	[ "$?" = 2 ] && return 2
+	return "$RETVAL"
+}
+
+#
+# Function that sends a SIGHUP to the daemon/service
+#
+do_reload() {
+	#
+	# If the daemon can reload its configuration without
+	# restarting (for example, when it is sent a SIGHUP),
+	# then implement that here.
+	#
+	start-stop-daemon --stop --signal 1 --quiet $PIDFILE --name $NAME
+	return 0
+}
+
+case "$1" in
+  start)
+    [ "$VERBOSE" != no ] && log_daemon_msg "Starting $DESC " "$NAME"
+    do_start
+    case "$?" in
+		0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
+		2) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
+	esac
+  ;;
+  stop)
+	[ "$VERBOSE" != no ] && log_daemon_msg "Stopping $DESC" "$NAME"
+	do_stop
+	case "$?" in
+		0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
+		2) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
+	esac
+	;;
+  status)
+       status_of_proc "$DAEMON" "$NAME" && exit 0 || exit $?
+       ;;
+  #reload|force-reload)
+	#
+	# If do_reload() is not implemented then leave this commented out
+	# and leave 'force-reload' as an alias for 'restart'.
+	#
+	#log_daemon_msg "Reloading $DESC" "$NAME"
+	#do_reload
+	#log_end_msg $?
+	#;;
+  restart|force-reload)
+	#
+	# If the "reload" option is implemented then remove the
+	# 'force-reload' alias
+	#
+	log_daemon_msg "Restarting $DESC" "$NAME"
+	do_stop
+	case "$?" in
+	  0|1)
+		do_start
+		case "$?" in
+			0) log_end_msg 0 ;;
+			1) log_end_msg 1 ;; # Old process is still running
+			*) log_end_msg 1 ;; # Failed to start
+		esac
+		;;
+	  *)
+		# Failed to stop
+		log_end_msg 1
+		;;
+	esac
+	;;
+  *)
+	#echo "Usage: $SCRIPTNAME {start|stop|restart|reload|force-reload}" >&2
+	echo "Usage: $SCRIPTNAME {start|stop|status|restart|force-reload}" >&2
+	exit 3
+	;;
+esac
+
+:
diff --git a/debian/osmocom-gtphub.install b/debian/osmocom-gtphub.install
new file mode 100644
index 0000000..908c1a5
--- /dev/null
+++ b/debian/osmocom-gtphub.install
@@ -0,0 +1 @@ 
+/usr/bin/osmo-gtphub
diff --git a/debian/rules b/debian/rules
index 8047b79..62518d9 100755
--- a/debian/rules
+++ b/debian/rules
@@ -34,6 +34,7 @@  override_dh_strip:
 	dh_strip -posmocom-sgsn --dbg-package=osmocom-sgsn-dbg
 	dh_strip -posmocom-gbproxy --dbg-package=osmocom-gbproxy-dbg
 	dh_strip -posmocom-bsc-nat --dbg-package=osmocom-bsc-nat-dbg
+	dh_strip -posmocom-gtphub --dbg-package=osmocom-gtphub-dbg
 
 override_dh_auto_configure:
 	echo $(VERSION) > openbsc/.tarball-version
diff --git a/openbsc/doc/examples/osmo-gtphub/osmo-gtphub.cfg b/openbsc/doc/examples/osmo-gtphub/osmo-gtphub.cfg
new file mode 100644
index 0000000..c9bb4cf
--- /dev/null
+++ b/openbsc/doc/examples/osmo-gtphub/osmo-gtphub.cfg
@@ -0,0 +1,23 @@ 
+!
+! Osmocom gtphub configuration
+!
+
+line vty
+ no login
+
+gtphub
+ ! Local addresses to listen on and send from, each on standard ports
+ ! 2123 and 2152. Setting these addresses is mandatory.
+ bind-to-sgsns 127.0.0.1
+ bind-to-ggsns 127.0.0.2
+
+ ! Local nonstandard ports or separate IPs:
+ !bind-to-sgsns ctrl 127.0.0.1 2342 user 127.0.0.1 4223
+
+ ! Proxy: unconditionally direct all traffic to...
+ !ggsn-proxy 127.0.0.3
+ !sgsn-proxy 127.0.0.4
+
+ ! Proxy with nonstandard ports or separate IPs:
+ !ggsn-proxy ctrl 127.0.0.3 2123 user 127.0.0.5 2152
+