Porting PicoTCP WIP

kernel/picotcp/test/examples/natbox.c

@@ -0,0 +1,31 @@
+#include "utils.h"
+#include <pico_ipv4.h>
+#include <pico_nat.h>
+
+/*** START NATBOX ***/
+void app_natbox(char *arg)
+{
+    char *dest = NULL;
+    struct pico_ip4 ipdst, pub_addr, priv_addr;
+    struct pico_ipv4_link *link;
+
+    cpy_arg(&dest, arg);
+    if (!dest) {
+        fprintf(stderr, "natbox needs the following format: natbox:dst_addr\n");
+        exit(255);
+    }
+
+    pico_string_to_ipv4(dest, &ipdst.addr);
+    link = pico_ipv4_link_get(&ipdst);
+    if (!link) {
+        fprintf(stderr, "natbox: Destination not found.\n");
+        exit(255);
+    }
+
+    pico_ipv4_nat_enable(link);
+    pico_string_to_ipv4("10.50.0.10", &pub_addr.addr);
+    pico_string_to_ipv4("10.40.0.08", &priv_addr.addr);
+    pico_ipv4_port_forward(pub_addr, short_be(5555), priv_addr, short_be(6667), PICO_PROTO_UDP, PICO_NAT_PORT_FORWARD_ADD);
+    fprintf(stderr, "natbox: started.\n");
+}
+/*** END NATBOX ***/