unbound/services/outbound_list.c

   1 /*
   2  * services/outbound_list.c - keep list of outbound serviced queries.
   3  *
   4  * Copyright (c) 2007, NLnet Labs. All rights reserved.
   5  *
   6  * This software is open source.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * Redistributions of source code must retain the above copyright notice,
  13  * this list of conditions and the following disclaimer.
  14  *
  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  *
  19  * Neither the name of the NLNET LABS nor the names of its contributors may
  20  * be used to endorse or promote products derived from this software without
  21  * specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  24  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  25  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  26  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  27  * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  28  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
  29  * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  30  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  */
  35
  36 /**
  37  * \file
  38  *
  39  * This file contains functions to help a module keep track of the
  40  * queries it has outstanding to authoritative servers.
  41  */
  42 #include "config.h"
  43 #include <sys/time.h>
  44 #include "services/outbound_list.h"
  45 #include "services/outside_network.h"
  46
  47 void
  48 outbound_list_init(struct outbound_list* list)
  49 {
  50         list->first = NULL;
  51 }
  52
  53 void
  54 outbound_list_clear(struct outbound_list* list)
  55 {
  56         struct outbound_entry *p, *np;
  57         p = list->first;
  58         while(p) {
  59                 np = p->next;
  60                 outnet_serviced_query_stop(p->qsent, p);
  61                 /* in region, no free needed */
  62                 p = np;
  63         }
  64         outbound_list_init(list);
  65 }
  66
  67 void
  68 outbound_list_insert(struct outbound_list* list, struct outbound_entry* e)
  69 {
  70         if(list->first)
  71                 list->first->prev = e;
  72         e->next = list->first;
  73         e->prev = NULL;
  74         list->first = e;
  75 }
  76
  77 void
  78 outbound_list_remove(struct outbound_list* list, struct outbound_entry* e)
  79 {
  80         if(!e)
  81                 return;
  82         outnet_serviced_query_stop(e->qsent, e);
  83         if(e->next)
  84                 e->next->prev = e->prev;
  85         if(e->prev)
  86                 e->prev->next = e->next;
  87         else    list->first = e->next;
  88         /* in region, no free needed */
  89 }