training_repo/udp/server_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 socket_value;
    char message[BUFFER_SIZE];
    struct sockaddr_in server_addr={0};
    struct sockaddr_in client_addr;
    socklen_t client_len = sizeof(client_addr);
    // socket creation
    if((socket_value=socket(AF_INET,SOCK_DGRAM,0)) <0)
    {
        perror("server socket creation error");
        exit(EXIT_FAILURE);
    }
    //server addr speciifications
    server_addr.sin_family = AF_INET;
    server_addr.sin_addr.s_addr = INADDR_ANY;
    server_addr.sin_port = htons(PORT);
    // bind the socket to the port in server
    if(bind(socket_value,(struct sockaddr*)&server_addr,sizeof(server_addr))<0)
    {
        perror("bind fail");
        close(socket_value);
        exit(EXIT_FAILURE);
    }
    printf("server is listening on port\n");
    // receive message from client..
    while(1)
    {
        int len=recvfrom(socket_value, (char *)message, BUFFER_SIZE, MSG_WAITALL, (struct sockaddr *)&client_addr, &client_len); 
    message[len]='\0';
    printf("%s/n",message);
     // Send the length of the received message back to the client
     int message_length = strlen(message);
     snprintf(message, sizeof(message), "%d", message_length);  // Convert length to string
     sendto(socket_value, (const char *)message, strlen(message), MSG_CONFIRM, (const struct sockaddr *)&client_addr, client_len);
     printf("Sent message length to client: %d\n", message_length);
    }
    close(socket_value);


}