#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);

  }