ServerScript.cpp

#include <arpa/inet.h>
#include <cstring>
#include <iostream>
#include <netinet/in.h>
#include <sys/socket.h>
#include <thread>
#include <unistd.h>

void forward_packets(const char *listen_ip, int listen_port, int buffer_size) {
  int sock;
  struct sockaddr_in listen_addr, sender_addr;
  char buffer[buffer_size];

  if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
    std::cerr << "Socket creation error" << std::endl;
    return;
  }

  memset(&listen_addr, 0, sizeof(listen_addr));
  listen_addr.sin_family = AF_INET;
  listen_addr.sin_port = htons(listen_port);
  listen_addr.sin_addr.s_addr = inet_addr(listen_ip);

  if (bind(sock, (struct sockaddr *)&listen_addr, sizeof(listen_addr)) < 0) {
    std::cerr << "Bind failed" << std::endl;
    close(sock);
    return;
  }

  std::cout << "Listening for incoming UDP packets on " << listen_ip << ":"
            << listen_port << std::endl;

  while (true) {
    socklen_t len = sizeof(sender_addr);

    ssize_t recv_len = recvfrom(sock, buffer, buffer_size, 0,
                                (struct sockaddr *)&sender_addr, &len);
    if (recv_len < 0) {
      std::cerr << "recvfrom error" << std::endl;
      break;
    }

    std::cout << "Received packet from " << inet_ntoa(sender_addr.sin_addr)
              << ":" << ntohs(sender_addr.sin_port) << std::endl;

    if (sendto(sock, buffer, recv_len, 0, (struct sockaddr *)&sender_addr,
               len) < 0) {
      std::cerr << "sendto error" << std::endl;
      break;
    }

    std::cout << "Forwarded packet back to " << inet_ntoa(sender_addr.sin_addr)
              << ":" << ntohs(sender_addr.sin_port) << std::endl;
  }

  close(sock);
}

int main() {
  const char *listenIP = "0.0.0.0";

  int voicePortListen = 55000;
  int videoPortListen = 54999;

  int voiceBufferSize = 5700;
  int videoBufferSize = 10000;

  std::thread voiceThread(forward_packets, listenIP, voicePortListen,
                          voiceBufferSize);
  std::thread videoThread(forward_packets, listenIP, videoPortListen,
                          videoBufferSize);

  voiceThread.join();
  videoThread.join();

  return 0;
}