Use new lwIP netif facility for tftp_rom

LwIP can be used without libc or its plugin libraries.

Fix #36

run/tftp_rom.run

@@ -39,6 +39,7 @@ append config {
 		<service name="ROM"/>
 		<service name="SIGNAL"/>
 	</parent-provides>
+	<default caps="256"/>
 	<default-route>
 		<any-service> <parent/> <any-child/> </any-service>
 	</default-route>}
@@ -57,18 +58,21 @@ append config {
 	<start name="tftp_rom">
 		<resource name="RAM" quantum="32M"/>
 		<provides> <service name="ROM"/> </provides>
-		<config verbose="yes">
+		<config verbose="yes" dhcp="yes">
 			<libc stdout="/log" stderr="/log">
 				<vfs> <log/> </vfs>
 			</libc>
-			<policy label_prefix="init" ip="10.0.2.2" port="69"
+			<default-policy label_prefix="init" ip="10.0.2.2" port="69"
 			         dir="/genode" timeout="10"/>
 		</config>	
 	</start>
 	<start name="init">
-		<exit propagate="yes"/>
 		<resource name="RAM" quantum="6M"/>
 		<route>
+			<service name="ROM" unscoped_label="ld.lib.so">
+				<parent/> </service>
+			<service name="ROM" label_suffix="ld.lib.so">
+				<parent/> </service>
 			<any-service>
 				<child name="tftp_rom"/>
 				<parent/>
@@ -88,6 +92,7 @@ append config {
 			<default-route>
 				<any-service> <parent/> </any-service>
 			</default-route>
+			<default caps="256"/>
 			<start name="test-libc">
 				<resource name="RAM" quantum="4M"/>
 				<config>

src/server/tftp_rom/component.cc

@@ -21,17 +21,18 @@
 #include <base/attached_rom_dataspace.h>
 #include <base/heap.h>
 #include <root/component.h>
-#include <libc/component.h>
+#include <base/component.h>
 #include <util/list.h>
 #include <util/string.h>
 #include <util/endian.h>
 
-/* lwIP raw API */
+/* LwIP includes */
-#include <lwip/genode.h>
 #include <lwip/api.h>
 #include <lwip/inet.h>
 #include <lwip/udp.h>
 #include <lwip/init.h>
+#include <lwip/genode_init.h>
+#include <lwip/nic_netif.h>
 
 
 namespace Tftp_rom {
@@ -48,11 +49,11 @@ namespace Tftp_rom {
 }
 
 
-extern "C" void rrq_cb(void *arg, udp_pcb *upcb, pbuf *pbuf,
+extern "C" void rrq_cb(void *arg, struct udp_pcb *pcb, struct pbuf *p,
-                       ip_addr_t *addr, Genode::uint16_t port);
+                       const ip_addr_t *addr, u16_t port);
 
-extern "C" void data_cb(void *arg, udp_pcb *upcb, pbuf *pbuf,
+extern "C" void data_cb(void *arg, struct udp_pcb *pcb, struct pbuf *p,
-                        ip_addr_t *addr, Genode::uint16_t port);
+                        const ip_addr_t *addr, u16_t port);
 
 
 class Tftp_rom::Session_component :
@@ -185,7 +186,7 @@ class Tftp_rom::Session_component :
 			udp_send(_pcb, ack);
 		}
 
-		void first_response(pbuf *data, ip_addr_t *addr, uint16_t port)
+		void first_response(pbuf *data, ip_addr_t const *addr, uint16_t port)
 		{
 			/*
 			 * we now know the port the server will use,
@@ -325,8 +326,8 @@ class Tftp_rom::Session_component :
  ********************/
 
 
-extern "C" void rrq_cb(void *arg, udp_pcb *upcb, pbuf *data,
+extern "C" void rrq_cb(void *arg, struct udp_pcb *pcb, struct pbuf *data,
-                       ip_addr_t *addr, Genode::uint16_t port)
+                       const ip_addr_t *addr, u16_t port)
 {
 	Tftp_rom::Session_component *session = (Tftp_rom::Session_component*)arg;
 
@@ -347,7 +348,7 @@ extern "C" void rrq_cb(void *arg, udp_pcb *upcb, pbuf *data,
 
 
 extern "C" void data_cb(void *arg, udp_pcb *upcb, pbuf *data,
-                        ip_addr_t *addr, Genode::uint16_t port)
+                        ip_addr_t const *addr, Genode::uint16_t port)
 {
 	Tftp_rom::Session_component *session = (Tftp_rom::Session_component*)arg;
 	if (session->add_block(data)) return;
@@ -365,6 +366,11 @@ class Tftp_rom::Root : public Genode::Root_component<Session_component>
 		Genode::Env                    &_env;
 		Genode::Attached_rom_dataspace  _config_rom { _env, "config" };
 
+		/**
+		 * LwIP connection to Nic service
+		 */
+		Lwip::Nic_netif _netif { _env, *md_alloc(), _config_rom.xml() };
+
 		class Timeout_dispatcher : Genode::Thread, Genode::Lock
 		{
 			private:
@@ -456,6 +462,9 @@ class Tftp_rom::Root : public Genode::Root_component<Session_component>
 
 		Session_component *_create_session(const char *args) override
 		{
+			while (!_netif.ready())
+				_env.ep().wait_and_dispatch_one_io_signal();
+
 			Session_component *session;
 
 			_config_rom.update();
@@ -531,9 +540,14 @@ class Tftp_rom::Root : public Genode::Root_component<Session_component>
 };
 
 
-void Libc::Component::construct(Libc::Env &env )
+void Component::construct(Genode::Env &env)
 {
-	static Genode::Sliced_heap sliced_heap(env.ram(), env.rm());
+	env.exec_static_constructors();
-	static Tftp_rom::Root root(env, sliced_heap);
-}
 
+	static Genode::Heap heap(env.ram(), env.rm());
+	static Timer::Connection timer(env, "lwip");
+
+	Lwip::genode_init(heap, timer);
+
+	static Tftp_rom::Root root(env, heap);
+}

src/server/tftp_rom/target.mk

@@ -1,5 +1,5 @@
 TARGET = tftp_rom
 SRC_CC = component.cc
-LIBS   = base lwip libc libc_lwip libc_lwip_nic_dhcp
+LIBS   = base lwip
 
 CC_CXX_WARN_STRICT =