socket_server.cc

/*
   BAREOS® - Backup Archiving REcovery Open Sourced

   Copyright (C) 2000-2011 Free Software Foundation Europe e.V.
   Copyright (C) 2014-2018 Bareos GmbH & Co. KG

   This program is Free Software; you can redistribute it and/or
   modify it under the terms of version three of the GNU Affero General Public
   License as published by the Free Software Foundation and included
   in the file LICENSE.

   This program is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
   Affero General Public License for more details.

   You should have received a copy of the GNU Affero General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
   02110-1301, USA.
*/
/*
 * Kern Sibbald, October MM
 * Extracted from other source files by Marco van Wieringen, October 2014
 */
/**
 * @file
 * This file handles external connections made to the File daemon.
 */

#include "include/bareos.h"
#include "filed/filed.h"
#include "filed/filed_globals.h"
#include "filed/dir_cmd.h"
#include "filed/sd_cmds.h"
#include "lib/bsock.h"
#include "lib/bnet_server_tcp.h"
#include "lib/try_tls_handshake_as_a_server.h"
#include "lib/util.h"

namespace filedaemon {

/* Global variables */
static workq_t socket_workq;
static pthread_t tcp_server_tid;
static alist* sock_fds = NULL;

/**
 * Connection request. We accept connections either from the Director or the
 * Storage Daemon
 *
 * NOTE! We are running as a separate thread
 *
 * Send output one line at a time followed by a zero length transmission.
 * Return when the connection is terminated or there is an error.
 *
 * Basic tasks done here:
 *  - If it was a connection from an SD, call handle_stored_connection()
 *  - Otherwise it was a connection from the DIR, call
 * handle_director_connection()
 */
static void* HandleConnectionRequest(ConfigurationParser* config, void* arg)
{
  BareosSocket* bs = (BareosSocket*)arg;

  if (!TryTlsHandshakeAsAServer(bs, config)) {
    bs->signal(BNET_TERMINATE);
    bs->close();
    delete bs;
    return nullptr;
  }

  if (bs->recv() <= 0) {
    Emsg1(M_ERROR, 0, _("Connection request from %s failed.\n"), bs->who());
    Bmicrosleep(5, 0); /* make user wait 5 seconds */
    bs->signal(BNET_TERMINATE);
    bs->close();
    delete bs;
    return nullptr;
  }

  Dmsg1(110, "Conn: %s\n", bs->msg);

  /*
   * See if its a director making a connection.
   */
  char tbuf[100];
  if (bstrncmp(bs->msg, "Hello Director", 14)) {
    Dmsg1(110, "Got a DIR connection at %s\n",
          bstrftimes(tbuf, sizeof(tbuf), (utime_t)time(NULL)));
    return handle_director_connection(bs);
  }

  /*
   * See if its a storage daemon making a connection.
   */
  if (bstrncmp(bs->msg, "Hello Storage", 13)) {
    Dmsg1(110, "Got a SD connection at %s\n",
          bstrftimes(tbuf, sizeof(tbuf), (utime_t)time(NULL)));
    return handle_stored_connection(bs);
  }

  Emsg2(M_ERROR, 0, _("Invalid connection from %s. Len=%d\n"), bs->who(),
        bs->message_length);

  return nullptr;
}

void StartSocketServer(dlist* addrs)
{
  IPADDR* p;

  tcp_server_tid = pthread_self();

  /*
   * Become server, and handle requests
   */
  foreach_dlist (p, addrs) {
    Dmsg1(10, "filed: listening on port %d\n", p->GetPortHostOrder());
  }

  /*
   * Permit MaxConnections connections.
   */
  sock_fds = new alist(10, not_owned_by_alist);
  BnetThreadServerTcp(addrs, me->MaxConnections, sock_fds, &socket_workq,
                      me->nokeepalive, HandleConnectionRequest, my_config);
}

void StopSocketServer(bool wait)
{
  Dmsg0(100, "StopSocketServer\n");
  if (sock_fds) {
    BnetStopAndWaitForThreadServerTcp(tcp_server_tid);
    /*
     * before thread_servers terminates,
     * it calls cleanup_bnet_thread_server_tcp
     */
    if (wait) {
      pthread_join(tcp_server_tid, NULL);
      delete (sock_fds);
      sock_fds = NULL;
    }
  }
}
} /* namespace filedaemon */