sender.c
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#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <netdb.h>
#include <arpa/inet.h>
int initialized=0;
int sock_id;
int initializeSocketUDP(char* service)
{
struct addrinfo precisions, *resultat=NULL, *origine; // On stocke dans précisions nos besoins pour le socket, dans resultat l'adresse qui respectera les reqêtes
memset(&precisions, 0, sizeof precisions);
precisions.ai_family = AF_UNSPEC;
precisions.ai_socktype = SOCK_DGRAM;
//precisions.ai_flags = AI_PASSIVE;
if(getaddrinfo(NULL, service, &precisions, &origine)<0) { fprintf(stderr, "Erreur getaddrinfo\n"); return(-1); }
int n=0;
for(struct addrinfo* i=origine; i!=NULL && resultat==NULL; i=i->ai_next)
{
printf("%d - ", n);
if(i->ai_family==AF_INET)
{
resultat=i;
printf("Test : %d", origine->ai_addrlen);
}
printf("\n");
n++;
}
struct sockaddr_in* test=(struct sockaddr_in*)(resultat->ai_addr);
printf("Addr : %x\n", test->sin_addr.s_addr);
if((sock_id=socket(resultat->ai_family, resultat->ai_socktype, resultat->ai_protocol))<0) { fprintf(stderr, "Erreur socket\n"); return(-1); }
int val=1;
if(setsockopt(sock_id, SOL_SOCKET, SO_REUSEADDR|SO_BROADCAST, &val, sizeof(val))<0) { fprintf(stderr, "Erreur setsockopt\n"); return(-1); }
if(bind(sock_id, resultat->ai_addr, resultat->ai_addrlen)) { fprintf(stderr, "Erreur bind\n"); return(-1); }
freeaddrinfo(origine);
initialized=1;
}
int sendUDPBroadcast(char* message, int port)
{
static struct sockaddr_in addrUDP;
addrUDP.sin_family=AF_INET;
addrUDP.sin_port=(uint16_t)port;
struct in_addr tmpadd={0xffffffff};
addrUDP.sin_addr=tmpadd;
if(initialized!=1)
{
printf("Initialize via Broadcast\n");
char tmp_str[15];
sprintf(tmp_str, "%d", port);
initializeSocketUDP( tmp_str );
}
if(sendto(sock_id, message, sizeof(message), 0, (struct sockaddr*) &addrUDP, sizeof(addrUDP)) < 0) { fprintf(stderr, "Erreur sendto\n"); return(-1);}
}
int sendUDPUnicast(char* address, char* message, int port)
{
static struct sockaddr_in addrUDP;
addrUDP.sin_family=AF_INET;
addrUDP.sin_port=(uint16_t)port;
inet_aton(address, &(addrUDP.sin_addr)); // Converti l'écriture string de format a.b.c.d en format Internet
if(initialized!=1)
{
printf("Initialize via Unicast\n");
char tmp_str[15];
sprintf(tmp_str, "%d", port);
initializeSocketUDP( tmp_str );
}
if(sendto(sock_id, message, sizeof(message), 0, (struct sockaddr*) &addrUDP, sizeof(addrUDP)) < 0 ) { fprintf(stderr, "Error sendto\n"); return(-1); }
}
int main(void)
{
sendUDPBroadcast("Broadwesh", 2020);
sendUDPUnicast("255.255.255.255", "Uniwesh", 2020);
return(1);
close(sock_id);
}