c - client server xarentek

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

#define PORT 8080
#define MAXLEN 255
void die(char *error);
void handleClient(int sd, struct sockaddr *sa, int length);
int main(int argc, char const *argv[]) {
    int master_d;


    struct sockaddr_in bind_ip_port, client_ip_port;
    int bind_ip_port_length = sizeof(bind_ip_port);
    int client_ip_port_length = sizeof(client_ip_port);


    master_d = socket(AF_INET, SOCK_DGRAM, 0); // socket descriptor

    if (master_d < 0) {
        die("Could not connect \n");
    }
    printf("Connected !\n");

    if (master_d < 0) die("Socket error");
    printf("Socket() ok\n");


    bind_ip_port.sin_family = AF_INET;
    bind_ip_port.sin_addr.s_addr = inet_addr("127.0.0.1");
    bind_ip_port.sin_port = htons(PORT);

    //fare bind

    if(bind(master_d, (struct sockaddr *) &bind_ip_port, bind_ip_port_length) < 0) {
        die("Could not bind ! \n");
    }
    printf("Bind successful !\n");

    while(1){
        handleClient(master_d, (struct sockaddr *)&client_ip_port, client_ip_port_length);
    }

    close(master_d);

    return 0;


}


void handleClient(int sd, struct sockaddr *sa, int length) {

    char sendbuff[MAXLEN], recvbuff[MAXLEN];
    memset(sendbuff, 0, MAXLEN);
    memset(recvbuff, 0, MAXLEN);

    int bytesrecvd = recvfrom(sd, recvbuff, MAXLEN, 0 , sa, &length);
    if(bytesrecvd <= 0) die("Could not receive ! \n");

    printf("Bytes received ! \n");

    strcpy(sendbuff,recvbuff);

    int bytesent = sendto(sd, sendbuff, MAXLEN, 0 , sa ,length);

    if(bytesent <= 0){
        die("Could not reply to client !\n");
    }

    printf("Replied to client with %d bytes\n",bytesent);
    printf("%s\n",sendbuff);



}


void die(char * error){
    fprintf(stderr , "%s.\n", error);
    exit(1);
}




#######


client
############


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

#define PORT 8080
#define MAXLEN 255
void die(char *error);

int main(int argc, char const *argv[])
{
   int master_d;
   char sendbuff[MAXLEN], recvbuff[MAXLEN];

   struct sockaddr_in server_ip_port;
   int server_ip_port_length = sizeof(server_ip_port);

   memset(sendbuff, 0 , MAXLEN);
   memset(recvbuff, 0 , MAXLEN);

   master_d = socket(AF_INET, SOCK_DGRAM, 0); // socket descriptor

   if(master_d < 0){
       die("Could not connect \n");
   }
   printf("Connected !");

   if(master_d < 0) die ("Socket error");
   printf("Socket() ok\n");

   printf("Inserisci Stringa");
   gets(sendbuff);

   server_ip_port.sin_family = AF_INET;
   server_ip_port.sin_addr.s_addr = inet_addr("127.0.0.1");
   server_ip_port.sin_port = htons(PORT);


   int bytesent = sendto(master_d , sendbuff , MAXLEN, 0 , (struct sockaddr *) &server_ip_port, server_ip_port_length);

   if(bytesent < 0) {
       die("Could not send any bytes !");

   }
   printf("Bytes sent %d \n",bytesent);

   int bytesrecvd = recvfrom(master_d, recvbuff , MAXLEN , 0, (struct sockaddr *)&server_ip_port, &server_ip_port_length);

   if(bytesrecvd < 0) {
       die("Could not receive any bytes");
   }
   printf("Received %d bytes\n", bytesrecvd);

   printf("%s\n",recvbuff);
   close(master_d);
   return 0;

}


void die(char * error){
    fprintf(stderr , "%s.\n", error);
    exit(1);
}