Je dois realiser un programme qui permettrait d'envoyer des messages d'un server a un client.
Apparement ma fonction send() renvoie toujours -1 je n'arrive pas a savoir pour quoi, si vous pouviez m'aider. Voici le code du coté client.



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

#define bufLength 1024

void makeLocalSocketAdress(struct sockaddr_in *sa){
sa->sin_family =AF_INET;
sa->sin_port=htons(0); // any port or port 2222 ????? htons(atoi(argv[1]))
sa->sin_addr.s_addr = htonl(INADDR_ANY); // on local host
}

void makeRemoteSocketAdress(struct sockaddr_in *sa, char * hostname, int port) {
struct hostent *host;

if ((host= gethostbyname(hostname))==NULL){
printf("Unknown host name \n");exit(-1);
}
sa->sin_family = AF_INET ;
sa->sin_addr= *(struct in_addr *)(host->h_addr); //memcpy((char*)&(sa->sin_addr.s_addr), host->h_addr,host->h_length);
sa->sin_port = htons(port);

}

int main(int argc, char *argv[]){

int sock,port;
struct sockaddr_in serverAdress;
struct sockaddr_in clientAdress;
int addrLength=sizeof(struct sockaddr_in);
char msg[bufLength]; //message to send/receive
char * hostname=malloc(30); // server adress

extern char *optarg;
extern int optind;
int semantic=0;
int c=0;

if (argc <3){
printf("Please provide server and port number \n");exit(-1);
}
while ((c = getopt(argc, argv, "lm")) != -1) {
switch (c) {
case 'l':
semantic = 0; //0 at-least-once semantic
break;
case 'm':
semantic = 1; //1 at-most-once semantic
break;
default: printf("usage: cmd [-l][-m][adress server][port number] \n");
}
}

strcpy(hostname,argv[argc-2]); // Copy the server adress given by the client in the variable hostname
port = atoi(argv[argc-1]); // Copy the port number given by the client in the variable port
port=htons(port);

if ((sock = socket(AF_INET,SOCK_DGRAM,0))== -1){ // creation socket for internet communication domain over UDP
printf("Error creation socket\n");exit(-1);
}
makeLocalSocketAdress(&clientAdress);
if((bind(sock,(struct sockaddr*)&clientAdress,addrLength))==-1){ // bind socket
printf("Error bind socket\n");exit(-1);
}

makeRemoteSocketAdress(&serverAdress,hostname,port);
strcpy(msg,"message envoye et bien recu");
printf("message : %s \n",msg);

if (sendto(sock,msg,strlen(msg),0,(struct sockaddr *)&serverAdress,addrLength) !=0 ) {
perror("Receive 1") ;
printf("Error send to\n");}
return 0;
}

> Lire le message (5 commentaires, moyenne: 1).