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

int main()
{
  /* Create a UDP server socket on port 1337 */
  int server_fd = socket(PF_INET, SOCK_DGRAM, 0);
  struct sockaddr_in server_addr;
  server_addr.sin_family = AF_INET;
  //inet_pton(AF_INET, "127.0.0.1", &server_addr.sin_addr);
  inet_pton(AF_INET, "0.0.0.0", &server_addr.sin_addr);
  server_addr.sin_port = htons(1337);
  bind(server_fd, (struct sockaddr*)&server_addr, sizeof(struct sockaddr_in));

  /* Connect the server socket */
  struct sockaddr_in connect_addr;
  connect_addr.sin_family = AF_INET;
  inet_pton(AF_INET, "127.0.0.1", &connect_addr.sin_addr);
  connect_addr.sin_port = htons(80);
  connect(server_fd, (struct sockaddr*)&connect_addr, sizeof(struct sockaddr_in));

  /* Disconnect the server socket */
  struct sockaddr disconnect_addr;
  memset(&disconnect_addr, 0, sizeof(struct sockaddr));
  disconnect_addr.sa_family = AF_UNSPEC;
  connect(server_fd, &disconnect_addr, sizeof(struct sockaddr));

  /* Create a UDP client socket, connect it to the server */
  int client_fd = socket(PF_INET, SOCK_DGRAM, 0);
  struct sockaddr_in client_addr;
  client_addr.sin_family = AF_INET;
  inet_pton(AF_INET, "127.0.0.1", &client_addr.sin_addr);
  client_addr.sin_port = htons(1337);
  connect(client_fd, (struct sockaddr*)&client_addr, sizeof(struct sockaddr_in));

  /* Send a message from the client to the server */
  char buf[8];
  send(client_fd, "hello", sizeof("hello"), 0);
  recv(server_fd, buf, sizeof(buf), 0);
  printf("%s\n", buf);

  return 0;
}