dazibao/src/node.h

// Define constants

#ifndef NODE_H
#define NODE_H

#include <stdlib.h>
#include <time.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>

#include "tlv.h"
#include "hash.h"

// On which port do we listen to
#define LISTEN_PORT 1212

// The node ID
#define NODE_ID 42675882021843277

// The number of neighbours
// The neighbour table has 15 entries
#define NEIGHBOUR_MAX 15

/* la table de voisins, qui est indexée par adresses de socket (des paires (IP, Port)),
 * et dont chaque entrée contient un booléen indiquant si le pair est permanent
 * (configuré au lancement) ou transitoire, et la date de dernière réception d’un
 * paquet de la part de ce pair ;
*/
typedef struct neighbour_peer {
    struct in6_addr ip;
    short port;
    char is_temporary;
    struct timeval last_seen;
} neighbour_peer;

// The strucuture to hold the messages
/* It's a list of triplets, (Li,Si,Di)
 * Li : The Node ID of the publisher 64 bits
 * Si : the sequence number 16 bits
 * Di : the data of the message 192 bytes
*/

typedef struct pub_data {
	unsigned char length;
    long id;
    short seqno;
    char *data;
} pub_data;

// General list
typedef struct list {
	void *data;
	void *next;
} list;

// Static variables
static list *data_list;
static list *neighbour_list;

// TODO

// fonctions signatures
void listen_for_packets();

int check_header(char * received_datagram[], int len, struct packet pack);

int validate_tlvs(struct packet * pack, struct tlv_list * tlv_l);

int update_neighbours();

int work_with_tlvs(struct packet received_packet, char * data_from_packet[], struct sockaddr_in6 sender);

void add_tlv(packet *packet, tlv *tlv, char type);

int send_packet();

/* Prend un tlv, et construit un paquet pour ensuite l'envoyer à la liste
 * des paires.
 * Retourne -1 en cas d'échec, 0 en cas de succès.
 */
int send_tlv(struct tlv, struct sockaddr_in6 * sender_list[], int sender_list_size);

// threaded functions

void t_ask_for_more_peers();

void t_update_neighbours();

void t_get_network_state();

// Helper functions
int len_list(list *l);

neighbour_peer *get_random_neighbour();

#endif