sample_server.c

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

#define PORT 8889
#define BUFFER_SIZE 1024
#define TIMEOUT_SECONDS 5

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

    // Create socket
    if ((server_fd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
        perror("Socket creation failed");
        exit(EXIT_FAILURE);
    }

    // Prepare the server address structure
    server_addr.sin_family = AF_INET;
    server_addr.sin_addr.s_addr = INADDR_ANY;
    server_addr.sin_port = htons(PORT);

    // Bind socket to address
    if (bind(server_fd, (struct sockaddr *)&server_addr, sizeof(server_addr)) == -1) {
        perror("Bind failed");
        exit(EXIT_FAILURE);
    }

    // Listen for connections
    if (listen(server_fd, 5) == -1) {
        perror("Listen failed");
        exit(EXIT_FAILURE);
    }

    printf("Server listening on port %d\n", PORT);

    while (1) {
        // Accept incoming connection
        if ((client_socket = accept(server_fd, (struct sockaddr *)&client_addr, &addr_len)) == -1) {
            perror("Accept failed");
            exit(EXIT_FAILURE);
        }

        // Set timeout for the socket
        struct timeval timeout;
        timeout.tv_sec = TIMEOUT_SECONDS;
        timeout.tv_usec = 0;
        if (setsockopt(client_socket, SOL_SOCKET, SO_RCVTIMEO, (const char *)&timeout, sizeof(timeout)) == -1) {
            perror("Set socket timeout failed");
            exit(EXIT_FAILURE);
        }

        printf("Connection accepted from %s:%d\n", inet_ntoa(client_addr.sin_addr), ntohs(client_addr.sin_port));

        // Read data from client
        ssize_t bytes_received = recv(client_socket, buffer, BUFFER_SIZE, 0);
        if (bytes_received == -1) {
            perror("Receive error");
            close(client_socket);
            continue;
        } else if (bytes_received == 0) {
            printf("Client disconnected\n");
            close(client_socket);
            continue;
        }

        // Process received data
        printf("Received data from client: %.*s\n", (int)bytes_received, buffer);

        // Send response back to client
        const char *response = "Server received your message";
        send(client_socket, response, strlen(response), 0);

        // close(client_socket);
    }

    return 0;
}