training_repo/udp/client_udp.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>

#define PORT 8080
#define BUFFER_SIZE 1024

void main()
{
    int sock_value;
    char buffer[BUFFER_SIZE];
    struct sockaddr_in server_addr={0};
    socklen_t server_len = sizeof(server_addr);

    //Create UDP socket
    if ((sock_value = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
    {
        perror("Socket creation failed");
        exit(EXIT_FAILURE);
    }
    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(PORT);
    // Convert IP address from text to binary form
    if (inet_pton(AF_INET, "127.0.0.1", &server_addr.sin_addr) <= 0)
    {
        perror("Invalid address / Address not supported");
        close(sock_value);
        exit(EXIT_FAILURE);
     }
    printf("Enter a message to send to the server: ");
    fgets(buffer, sizeof(buffer), stdin);

    // Remove trailing newline character from fgets
     buffer[strcspn(buffer, "\n")] = '\0';
    //
      // Send message to the server
      sendto(sock_value, (const char *)buffer, strlen(buffer), MSG_CONFIRM, (const struct sockaddr *)&server_addr, server_len);
      printf("Message sent to server: %s\n", buffer);
    //receive
    int n = recvfrom(sock_value, (char *)buffer, BUFFER_SIZE, MSG_WAITALL, (struct sockaddr *)&server_addr, &server_len);
    buffer[n] = '\0';  // Null-terminate the received data
     printf("Server responded with message length: %s\n", buffer);
    //
     //Close the socket
    close(sock_value);

}