server.c

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

#define PORT 8080
#define BUFFER_SIZE 1024

int main() {
    int server_fd, client_fd;
    struct sockaddr_in server_addr, client_addr;
    char buffer[BUFFER_SIZE];
    socklen_t addr_len = sizeof(client_addr);

    // Create socket
    if ((server_fd = socket(AF_INET, SOCK_STREAM, 0)) == 0) {
        perror("Socket failed");
        exit(EXIT_FAILURE);
    }

    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
    if (bind(server_fd, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0) {
        perror("Bind failed");
        exit(EXIT_FAILURE);
    }

    // Listen for incoming connections
    if (listen(server_fd, 3) < 0) {
        perror("Listen failed");
        exit(EXIT_FAILURE);
    }
    printf("Waiting for connections on port %d...\n", PORT);

    // Accept a client connection
    if ((client_fd = accept(server_fd, (struct sockaddr *)&client_addr, &addr_len)) < 0) {
        perror("Accept failed");
        exit(EXIT_FAILURE);
    }

    printf("Client connected\n");

    // Communication loop
    while (1) {
        memset(buffer, 0, sizeof(buffer));
        
        // Receive message from client
        int n = recv(client_fd, buffer, sizeof(buffer), 0);
        if (n <= 0) {
            printf("Client disconnected or error occurred\n");
            break;
        }
        printf("Client: %s\n", buffer);
        
        // Send response to client
        printf("Enter your response: ");
        fgets(buffer, sizeof(buffer), stdin);
        send(client_fd, buffer, strlen(buffer), 0);
    }

    // Close the socket
    close(client_fd);
    close(server_fd);
    return 0;
}