Added basic Local/LAN discovery.

1 files changed, 78 insertions, 0 deletions

diff --git a/core/LAN_discovery.c b/core/LAN_discovery.c
new file mode 100644
index 00000000..a19e4126
--- /dev/null
+++ b/core/LAN_discovery.c
@@ -0,0 +1,78 @@
+/* LAN_discovery.c
+ * 
+ * LAN discovery implementation.
+ * 
+ */
+
+#include "routing.h"
+
+
+/*Return the broadcast ip
+  TODO: make it return the real one, not the 255.255.255.255 one.*/
+IP broadcast_ip()
+{
+    IP ip;
+    ip.i = ~0;
+    return ip;
+}
+
+/*return 0 if ip is a LAN ip
+  return -1 if it is not */
+int LAN_ip(IP ip)
+{
+    if(ip.c[0] == 127)/* Loopback */
+    {
+        return 0;
+    }
+    if(ip.c[0] == 10)/* 10.0.0.0 to 10.255.255.255 range */
+    {
+        return 0;
+    }
+    if(ip.c[0] == 172 && ip.c[1] >= 16 && ip.c[1] <= 31)/* 172.16.0.0 to 172.31.255.255 range */
+    {
+        return 0;
+    }
+    if(ip.c[0] == 192 && ip.c[1] == 168) /* 192.168.0.0 to 192.168.255.255 range */
+    {
+        return 0;
+    }
+    if(ip.c[0] == 169 && ip.c[1] == 254 && ip.c[2] != 0 && ip.c[2] != 255)/* 169.254.1.0 to 169.254.254.255 range */
+    {
+        return 0;
+    }
+    return -1;
+}
+
+int handle_LANdiscovery(uint8_t * packet, uint32_t length, IP_Port source)
+{
+    if(LAN_ip(source.ip) == -1)
+    {
+        return 1;
+    }
+    if(length != crypto_box_PUBLICKEYBYTES + 1)
+    {
+        return 1;
+    }
+    DHT_bootstrap(source, packet + 1);
+    return 0;
+}
+
+
+int send_LANdiscovery(uint16_t port)
+{
+    uint8_t data[crypto_box_PUBLICKEYBYTES + 1];
+    data[0] = 32;
+    memcpy(data + 1, self_public_key, crypto_box_PUBLICKEYBYTES);
+    IP_Port ip_port = {broadcast_ip(), port};
+    return sendpacket(ip_port, data, 1 + crypto_box_PUBLICKEYBYTES);
+}
+
+
+int LANdiscovery_handlepacket(uint8_t * packet, uint32_t length, IP_Port source)
+{
+    if(packet[0] == 32)
+    {
+        return handle_LANdiscovery(packet, length, source);
+    }
+    return 1;
+}