qdevices/qnetd-dpd-timer.c

   1 /*
   2  * Copyright (c) 2015-2016 Red Hat, Inc.
   3  *
   4  * All rights reserved.
   5  *
   6  * Author: Jan Friesse (jfriesse@redhat.com)
   7  *
   8  * This software licensed under BSD license, the text of which follows:
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions are met:
  12  *
  13  * - Redistributions of source code must retain the above copyright notice,
  14  *   this list of conditions and the following disclaimer.
  15  * - Redistributions in binary form must reproduce the above copyright notice,
  16  *   this list of conditions and the following disclaimer in the documentation
  17  *   and/or other materials provided with the distribution.
  18  * - Neither the name of the Red Hat, Inc. nor the names of its
  19  *   contributors may be used to endorse or promote products derived from this
  20  *   software without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  23  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  26  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  32  * THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include "log.h"
  36 #include "qnetd-dpd-timer.h"
  37
  38 static int
  39 qnetd_dpd_timer_cb(void *data1, void *data2)
  40 {
  41         struct qnetd_instance *instance;
  42         struct qnetd_client *client;
  43
  44         instance = (struct qnetd_instance *)data1;
  45
  46         TAILQ_FOREACH(client, &instance->clients, entries) {
  47                 if (!client->init_received) {
  48                         continue;
  49                 }
  50
  51                 client->dpd_time_since_last_check += instance->advanced_settings->dpd_interval;
  52
  53                 if (client->dpd_time_since_last_check > (client->heartbeat_interval * 2)) {
  54                         if (!client->dpd_msg_received_since_last_check) {
  55                                 log(LOG_WARNING, "Client %s doesn't sent any message during "
  56                                     "%"PRIu32"ms. Disconnecting",
  57                                     client->addr_str, client->dpd_time_since_last_check);
  58
  59                                 client->schedule_disconnect = 1;
  60                         } else {
  61                                 client->dpd_time_since_last_check = 0;
  62                                 client->dpd_msg_received_since_last_check = 0;
  63                         }
  64                 }
  65         }
  66
  67         return (-1);
  68 }
  69
  70 int
  71 qnetd_dpd_timer_init(struct qnetd_instance *instance)
  72 {
  73
  74         if (!instance->advanced_settings->dpd_enabled) {
  75                 return (0);
  76         }
  77
  78         instance->dpd_timer = timer_list_add(&instance->main_timer_list,
  79             instance->advanced_settings->dpd_interval,
  80             qnetd_dpd_timer_cb, (void *)instance, NULL);
  81         if (instance->dpd_timer == NULL) {
  82                 log(LOG_ERR, "Can't initialize dpd timer");
  83
  84                 return (-1);
  85         }
  86
  87         return (0);
  88 }
  89
  90 void
  91 qnetd_dpd_timer_destroy(struct qnetd_instance *instance)
  92 {
  93
  94         if (instance->dpd_timer != NULL) {
  95                 timer_list_delete(&instance->main_timer_list, instance->dpd_timer);
  96                 instance->dpd_timer = NULL;
  97         }
  98 }