UDP - ECHO - CLIENTE

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

#define PORT 8080
#define MAX_SIZE 100

// Driver code
int main() {
    int sockfd;
    char msg[MAX_SIZE];
    struct sockaddr_in servaddr;

    sockfd = socket(AF_INET, SOCK_DGRAM, 0);

    memset(&servaddr, 0, sizeof(servaddr));

    servaddr.sin_family = AF_INET;
    servaddr.sin_port = htons(PORT);
    servaddr.sin_addr.s_addr = INADDR_ANY;

    int n, len = sizeof(servaddr);;

    while(1){
      printf("Enter message:\n");
      memset(&msg, 0, sizeof msg);
      fgets(msg, MAX_SIZE, stdin);
      n = strlen(msg);
      msg[n-1] = '\0';
      sendto(sockfd, (char*) msg, MAX_SIZE, MSG_CONFIRM, (struct sockaddr *) &servaddr, len);
      if(msg[0] == '#') break;
      recvfrom(sockfd, (char*) msg, MAX_SIZE, MSG_WAITALL, (struct sockaddr *) &servaddr, (socklen_t *) &len);
      printf("Received and sent: %s\n", msg);
    }

    close(sockfd);
    return 0;
}