build tlvs #NOT FINISHED#

src/node.c

@@ -175,21 +175,33 @@ void work_with_tlvs(char *data, short packet_len){
                 pos += tlv_len + 2;
                 break;
             case 2:
-                // We received a neighbour request so a neighbor tlv has to be sent
+                // We received a neighbour request so a random neighbor tlv has to be sent
                 tlv_len = data[pos+1];
                 pos += tlv_len + 2;
 
-                // NOT FINISHED - Where are ip and seqno stored?
-                build_neighbour(&tmp_tlv, ip, seqno);
+                // Send a neighbour tlv
+                neighbour_peer *random = get_random_neighbour();
+                build_neighbour(&tmp_tlv, random->ip, random->port);
+
                 // NOT FINISHED - What packet is it added to?
                 add_tlv(packet, &tmp_tlv, 3);
                 break;
             case 3:
                 // We received a neighbour tlv so a tlv network hash is sent to that address
+            	neighbour* cur_tlv = ((neighbour*) data) + pos;
+            	struct in6_addr ip = cur_tlv->ip;
+				short port = cur_tlv->port;
+
                 tlv_len = data[pos+1];
                 pos += tlv_len + 2;
 
-                tlv.neighbour = (neighbour*) (data + pos);
+                // Build network hash
+                unsigned char hash[16];
+                hash_network(neighbour_list, hash);
+                build_network_hash(&tmp_tlv, hash);
+                
+                // NOT FINISHED - What packet is it added to?
+                add_tlv(packet, &tmp_tlv, 4);
                 break;
             case 4:
                 // We reveived a network hash tlv so  
@@ -274,6 +286,36 @@ void work_with_tlvs(struct tlvs_list receivied_tlvs){
                 // we store the entry in our data table.
 }
 
+// Get list length
+int len_list(list *l) {
+	int len = 0;
+	list *tmp = l;
+
+	while(tmp != NULL) {
+		tmp = tmp->next;
+		len++;
+	}
+
+	return len;
+}
+
+// Get a random neighbour
+neighbour_peer *get_random_neighbour() {
+	// Get a random number
+    time_t t;
+    srand((unsigned) time(&t));
+    int n = rand() % len_list(neighbour_list);
+
+    // Get nth neighbour
+    list *tmp = neighbour_list;
+    
+    for(int i=0; i<n; i++) {
+    	tmp = tmp->next;
+    }
+
+    return (neighbour_peer*) tmp->data;
+}
+
 int main(int argc, const char *argv[]) {
     int cont = 1;
 

src/node.h

@@ -4,6 +4,7 @@
 #define NODE_H
 
 #include <stdlib.h>
+#include <time.h>
 #include <stdio.h>
 #include <sys/types.h>
 #include <sys/socket.h>
@@ -55,7 +56,7 @@ typedef struct list {
 	void *next;	
 } list;
 
-// static lists
+// Static variables
 static list *data_list; 
 static list *neighbour_list;
 
@@ -83,8 +84,8 @@ void t_update_neighbours();
 void t_get_network_state();
 
 // Helper functions
-char * hash();
+int len_list(list *l);
 
-short * get_seq_no(short s, int n);
+neighbour_peer *get_random_neighbour();
 
 #endif

src/tlv.h

@@ -1,10 +1,11 @@
+#ifndef TLV_H
+#define TLV_H
+
 #include <sys/socket.h>
 #include <netinet/in.h>
 #include <stdlib.h>
 #include "parser.h"
-
-#ifndef TLV_H
-#define TLV_H
+#include "hash.h"
 
 #define LEN_NEIGHBOUR_REQ 0
 #define LEN_NEIGHBOUR 18
@@ -115,7 +116,7 @@ int build_tlv(tlv *tlv, cmd_token token);
 int build_pad1(tlv *tlv);
 int build_padn(tlv *tlv, size_t len);
 int build_neighbour_req(tlv *tlv);
-int build_neighbour(tlv *tlv, struct in6_addr ip, short seqno);
+int build_neighbour(tlv *tlv, struct in6_addr ip, short port);
 int build_network_hash(tlv *tlv, char *network_hash);
 int build_network_state_req(tlv *tlv);
 int build_node_hash(tlv *tlv, long node_id, short seqno, char *node_hash);