dazibao/src/node.h

// Define constants

#ifndef NODE_H
#define NODE_H

#include <sys/socket.h>
#include <netinet/in.h>
#include "tlv.h"

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

// The node ID
#define NODE_ID 203242402519736214145149136169422092269247115186189140178187251487819615911212154252117172522111472481308026129190139512419121015210238252292031613214452118122204415160254

// 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 message {
    long node_id_publisher;
    short seqno;
    char *data;
} message;

// 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);

// threaded functions

void t_ask_for_more_peers();

void t_update_neighbours();

void t_get_network_state();

// Helper functions
char * hash();

short * get_seq_no(short s, int n);

#endif