Пример #1
0
/*
 * gethostbyname_thread() resolves a name and then exits.
 */
static unsigned int CURL_STDCALL gethostbyname_thread (void *arg)
{
  struct thread_sync_data *tsd = (struct thread_sync_data *)arg;
  struct thread_data *td = tsd->td;

  tsd->res = Curl_ipv4_resolve_r(tsd->hostname, tsd->port);

  if(!tsd->res) {
    tsd->sock_error = SOCKERRNO;
    if(tsd->sock_error == 0)
      tsd->sock_error = RESOLVER_ENOMEM;
  }

  Curl_mutex_acquire(tsd->mtx);
  if(tsd->done) {
    /* too late, gotta clean up the mess */
    Curl_mutex_release(tsd->mtx);
    destroy_thread_sync_data(tsd);
    free(td);
  }
  else {
    tsd->done = 1;
    Curl_mutex_release(tsd->mtx);
  }

  return 0;
}
Пример #2
0
/*
 * destroy_async_data() cleans up async resolver data and thread handle.
 */
static void destroy_async_data (struct Curl_async *async)
{
  if(async->os_specific) {
    struct thread_data *td = (struct thread_data*) async->os_specific;
    int done;

    /*
     * if the thread is still blocking in the resolve syscall, detach it and
     * let the thread do the cleanup...
     */
    Curl_mutex_acquire(td->tsd.mtx);
    done = td->tsd.done;
    td->tsd.done = 1;
    Curl_mutex_release(td->tsd.mtx);

    if(!done) {
      Curl_thread_destroy(td->thread_hnd);
    }
    else {
      if(td->thread_hnd != curl_thread_t_null)
        Curl_thread_join(&td->thread_hnd);

      destroy_thread_sync_data(&td->tsd);

      free(async->os_specific);
    }
  }
  async->os_specific = NULL;

  free(async->hostname);
  async->hostname = NULL;
}
Пример #3
0
/*
 * getaddrinfo_thread() resolves a name and then exits.
 *
 * For builds without ARES, but with ENABLE_IPV6, create a resolver thread
 * and wait on it.
 */
static unsigned int CURL_STDCALL getaddrinfo_thread (void *arg)
{
  struct thread_sync_data *tsd = (struct thread_sync_data*)arg;
  struct thread_data *td = tsd->td;
  char service[12];
  int rc;

  snprintf(service, sizeof(service), "%d", tsd->port);

  rc = Curl_getaddrinfo_ex(tsd->hostname, service, &tsd->hints, &tsd->res);

  if(rc != 0) {
    tsd->sock_error = SOCKERRNO?SOCKERRNO:rc;
    if(tsd->sock_error == 0)
      tsd->sock_error = RESOLVER_ENOMEM;
  }
  else {
    Curl_addrinfo_set_port(tsd->res, tsd->port);
  }

  Curl_mutex_acquire(tsd->mtx);
  if(tsd->done) {
    /* too late, gotta clean up the mess */
    Curl_mutex_release(tsd->mtx);
    destroy_thread_sync_data(tsd);
    free(td);
  }
  else {
    tsd->done = 1;
    Curl_mutex_release(tsd->mtx);
  }

  return 0;
}
Пример #4
0
/*
 * Curl_is_resolved() is called repeatedly to check if a previous name resolve
 * request has completed. It should also make sure to time-out if the
 * operation seems to take too long.
 */
CURLcode Curl_is_resolved(struct connectdata *conn,
                          struct Curl_dns_entry **entry)
{
  struct SessionHandle *data = conn->data;
  struct thread_data   *td = (struct thread_data*) conn->async.os_specific;
  int done = 0;
 
  *entry = NULL;

  if (!td) {
    DEBUGASSERT(td);
    return CURLE_COULDNT_RESOLVE_HOST;
  }

  Curl_mutex_acquire(td->tsd.mtx);
  done = td->tsd.done;
  Curl_mutex_release(td->tsd.mtx);

  if (done) { 
    getaddrinfo_complete(conn);
    if (td->poll_interval != 0)
        Curl_expire(conn->data, 0);
    Curl_destroy_thread_data(&conn->async);

    if(!conn->async.dns) {
      failf(data, "Could not resolve host: %s; %s",
            conn->host.name, Curl_strerror(conn, conn->async.status));
      return CURLE_COULDNT_RESOLVE_HOST;
    }
    *entry = conn->async.dns;
  } else {
    /* poll for name lookup done with exponential backoff up to 250ms */
    int elapsed;

    elapsed = Curl_tvdiff(Curl_tvnow(), data->progress.t_startsingle);
    if (elapsed < 0) {
      elapsed = 0;
    }

    if (td->poll_interval == 0) {
      /* Start at 1ms poll interval */
      td->poll_interval = 1;
    } else if (elapsed >= td->interval_end) {
      /* Back-off exponentially if last interval expired  */
      td->poll_interval *= 2;
    }

    if (td->poll_interval > 250)
      td->poll_interval = 250;

    td->interval_end = elapsed + td->poll_interval;

    Curl_expire(conn->data, td->poll_interval);
  }

  return CURLE_OK;
}
Пример #5
0
/*
 * Curl_resolver_is_resolved() is called repeatedly to check if a previous
 * name resolve request has completed. It should also make sure to time-out if
 * the operation seems to take too long.
 */
CURLcode Curl_resolver_is_resolved(struct connectdata *conn,
                                   struct Curl_dns_entry **entry)
{
  struct Curl_easy *data = conn->data;
  struct thread_data   *td = (struct thread_data*) conn->async.os_specific;
  int done = 0;

  *entry = NULL;

  if(!td) {
    DEBUGASSERT(td);
    return CURLE_COULDNT_RESOLVE_HOST;
  }

  Curl_mutex_acquire(td->tsd.mtx);
  done = td->tsd.done;
  Curl_mutex_release(td->tsd.mtx);

  if(done) {
    getaddrinfo_complete(conn);

    if(!conn->async.dns) {
      CURLcode result = resolver_error(conn);
      destroy_async_data(&conn->async);
      return result;
    }
    destroy_async_data(&conn->async);
    *entry = conn->async.dns;
  }
  else {
    /* poll for name lookup done with exponential backoff up to 250ms */
    timediff_t elapsed = Curl_timediff(Curl_now(),
                                       data->progress.t_startsingle);
    if(elapsed < 0)
      elapsed = 0;

    if(td->poll_interval == 0)
      /* Start at 1ms poll interval */
      td->poll_interval = 1;
    else if(elapsed >= td->interval_end)
      /* Back-off exponentially if last interval expired  */
      td->poll_interval *= 2;

    if(td->poll_interval > 250)
      td->poll_interval = 250;

    td->interval_end = elapsed + td->poll_interval;
    Curl_expire(conn->data, td->poll_interval, EXPIRE_ASYNC_NAME);
  }

  return CURLE_OK;
}
Пример #6
0
/*
 * gethostbyname_thread() resolves a name and then exits.
 */
static unsigned int CURL_STDCALL gethostbyname_thread (void *arg)
{
  struct thread_sync_data *tsd = (struct thread_sync_data *)arg;

  tsd->res = Curl_ipv4_resolve_r(tsd->hostname, tsd->port);

  if(!tsd->res) {
    tsd->sock_error = SOCKERRNO;
    if(tsd->sock_error == 0)
      tsd->sock_error = RESOLVER_ENOMEM;
  }

  Curl_mutex_acquire(tsd->mtx);
  tsd->done = 1;
  Curl_mutex_release(tsd->mtx);

  return 0;
}
Пример #7
0
/*
 * getaddrinfo_thread() resolves a name and then exits.
 *
 * For builds without ARES, but with ENABLE_IPV6, create a resolver thread
 * and wait on it.
 */
static unsigned int CURL_STDCALL getaddrinfo_thread (void *arg)
{
  struct thread_sync_data *tsd = (struct thread_sync_data*)arg;
  char   service [NI_MAXSERV];
  int rc;

  snprintf(service, sizeof(service), "%d", tsd->port);

  rc = Curl_getaddrinfo_ex(tsd->hostname, service, &tsd->hints, &tsd->res);

  if(rc != 0) {
    tsd->sock_error = SOCKERRNO?SOCKERRNO:rc;
    if(tsd->sock_error == 0)
      tsd->sock_error = RESOLVER_ENOMEM;
  }

  Curl_mutex_acquire(tsd->mtx);
  tsd->done = 1;
  Curl_mutex_release(tsd->mtx);

  return 0;
}