lokinet/daemon/dns.cpp

#include <getopt.h>
#include <signal.h>
#include <stdio.h> /* fprintf, printf */
#include <unistd.h>

#include <llarp/logic.h>
#include "dnsd.hpp"
#include "ev.hpp"
#include "logger.hpp"
#include "net.hpp"

#include <thread>  // for multithreaded version
#include <vector>

bool done = false;

void
handle_signal(int sig)
{
  printf("got SIGINT\n");
  done = true;
}

sockaddr *
hookChecker(std::string name)
{
  llarp::LogInfo("Hooked ", name);
  return nullptr;
}

// FIXME: make configurable
#define SERVER "8.8.8.8"
#define PORT 53

int
main(int argc, char *argv[])
{
  int code = 1;
  llarp::LogInfo("Starting up server");

  // llarp::SetLogLevel(llarp::eLogDebug);

  if(1)
  {
    // libev version
    llarp_ev_loop *netloop   = nullptr;
    llarp_threadpool *worker = nullptr;
    llarp_logic *logic       = nullptr;

    llarp_ev_loop_alloc(&netloop);

    // configure main netloop
    struct dnsd_context dnsd;
    if(!llarp_dnsd_init(&dnsd, netloop, "*", 1053, SERVER, PORT))
    {
      // llarp::LogError("failed to initialize dns subsystem");
      llarp::LogError("Couldnt init dns daemon");
      return 0;
    }
    // Configure intercept
    dnsd.intercept = &hookChecker;

    // singlethreaded
    if(0)
    {
      llarp::LogInfo("singlethread start");
      worker = llarp_init_same_process_threadpool();
      logic  = llarp_init_single_process_logic(worker);
      llarp_ev_loop_run_single_process(netloop, worker, logic);
      llarp::LogInfo("singlethread end");
    }
    else
    {
      uint num_llarpworkers = 2;
      uint num_nethreads    = 8;
      llarp::LogInfo("multithreaded start with ", num_llarpworkers,
                     " llarp-workers and ", num_nethreads, " networkers");
      // create workers
      worker     = llarp_init_threadpool(num_llarpworkers, "llarp-worker");
      logic      = llarp_init_logic();
      auto netio = netloop;
      std::vector< std::thread > netio_threads;
      while(num_nethreads--)
      {
        netio_threads.emplace_back([netio]() { llarp_ev_loop_run(netio); });
#if(__APPLE__ && __MACH__)

#elif(__FreeBSD__)
        pthread_set_name_np(netio_threads.back().native_handle(),
                            "llarp-netio");
#else
        pthread_setname_np(netio_threads.back().native_handle(), "llarp-netio");
#endif
      }
      llarp_logic_mainloop(logic);
      llarp::LogInfo("multithreaded end");
    }
    llarp_ev_loop_free(&netloop);
  }
  else
  {
    struct sockaddr_in m_address;
    int m_sockfd;

    m_sockfd                  = socket(AF_INET, SOCK_DGRAM, 0);
    m_address.sin_family      = AF_INET;
    m_address.sin_addr.s_addr = INADDR_ANY;
    m_address.sin_port        = htons(1053);
    int rbind                 = bind(m_sockfd, (struct sockaddr *)&m_address,
                     sizeof(struct sockaddr_in));

    if(rbind != 0)
    {
      llarp::LogError("Could not bind: ", strerror(errno));
      return 0;
    }

    const size_t BUFFER_SIZE = 1024;
    char buffer[BUFFER_SIZE];  // 1024 is buffer size
    struct sockaddr_in clientAddress;
    socklen_t addrLen = sizeof(struct sockaddr_in);

    struct timeval tv;
    tv.tv_sec  = 0;
    tv.tv_usec = 100 * 1000;  // 1 sec
    if(setsockopt(m_sockfd, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv)) < 0)
    {
      perror("Error");
    }

    signal(SIGINT, handle_signal);
    while(!done)
    {
      // sigint quits after next packet
      int nbytes = recvfrom(m_sockfd, buffer, BUFFER_SIZE, 0,
                            (struct sockaddr *)&clientAddress, &addrLen);
      if(nbytes == -1)
        continue;
      llarp::LogInfo("Received Bytes ", nbytes);

      raw_handle_recvfrom(&m_sockfd, (const struct sockaddr *)&clientAddress,
                          buffer, nbytes);
    }
  }

  return code;
}