http_c.c

#include <netinet/in.h>
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <unistd.h>

int main() {
  // Step 1: Create the socket
  int server_fd = socket(AF_INET, SOCK_STREAM, 0);

  // Step 2: Bind the socket to an IP and port
  struct sockaddr_in address;
  address.sin_family = AF_INET;
  address.sin_addr.s_addr = inet_addr("127.0.0.1");
  address.sin_port = htons(8080);
  bind(server_fd, (struct sockaddr *)&address, sizeof(address));

  // Step 3: Listen for incoming connections
  listen(server_fd, 3);

  printf("Server is running and listening on port 8080...\n");

  while (1) { // Infinite loop to keep accepting new connections
    // Step 4: Accept an incoming connection (Three-way handshake happens here)
    int addrlen = sizeof(address);
    int new_socket =
        accept(server_fd, (struct sockaddr *)&address, (socklen_t *)&addrlen);

    if (new_socket < 0) {
      perror("Failed to accept connection");
      continue;
    }

    printf("Connection accepted.\n");

    // Step 5: Handle data transfer
    char buffer[1024] = {0};
    read(new_socket, buffer, 1024);         // Read data from client
    printf("Client message: %s\n", buffer); // Print client's message

    // Respond to the client
    char *response = "Hello from server!";
    write(new_socket, response, strlen(response));

    // Step 6: Close the client connection (Four-way handshake)
    close(new_socket); // Close the socket for this client
    printf("Connection closed.\n");
  }

  // Close the listening socket (this part will never be reached in the current
  // loop)
  close(server_fd);

  return 0;
}