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      1 
      2 /* Copyright 1998 by the Massachusetts Institute of Technology.
      3  * Copyright (C) 2004-2010 by Daniel Stenberg
      4  *
      5  * Permission to use, copy, modify, and distribute this
      6  * software and its documentation for any purpose and without
      7  * fee is hereby granted, provided that the above copyright
      8  * notice appear in all copies and that both that copyright
      9  * notice and this permission notice appear in supporting
     10  * documentation, and that the name of M.I.T. not be used in
     11  * advertising or publicity pertaining to distribution of the
     12  * software without specific, written prior permission.
     13  * M.I.T. makes no representations about the suitability of
     14  * this software for any purpose.  It is provided "as is"
     15  * without express or implied warranty.
     16  */
     17 
     18 #include "ares_setup.h"
     19 #include <assert.h>
     20 #include <stdlib.h>
     21 #include "ares.h"
     22 #include "ares_private.h"
     23 
     24 void ares_destroy_options(struct ares_options *options)
     25 {
     26   int i;
     27 
     28   if(options->servers)
     29     free(options->servers);
     30   for (i = 0; i < options->ndomains; i++)
     31     free(options->domains[i]);
     32   free(options->domains);
     33   if(options->sortlist)
     34     free(options->sortlist);
     35   free(options->lookups);
     36 }
     37 
     38 void ares_destroy(ares_channel channel)
     39 {
     40   int i;
     41   struct query *query;
     42   struct list_node* list_head;
     43   struct list_node* list_node;
     44 
     45   if (!channel)
     46     return;
     47 
     48   list_head = &(channel->all_queries);
     49   for (list_node = list_head->next; list_node != list_head; )
     50     {
     51       query = list_node->data;
     52       list_node = list_node->next;  /* since we're deleting the query */
     53       query->callback(query->arg, ARES_EDESTRUCTION, 0, NULL, 0);
     54       ares__free_query(query);
     55     }
     56 #ifndef NDEBUG
     57   /* Freeing the query should remove it from all the lists in which it sits,
     58    * so all query lists should be empty now.
     59    */
     60   assert(ares__is_list_empty(&(channel->all_queries)));
     61   for (i = 0; i < ARES_QID_TABLE_SIZE; i++)
     62     {
     63       assert(ares__is_list_empty(&(channel->queries_by_qid[i])));
     64     }
     65   for (i = 0; i < ARES_TIMEOUT_TABLE_SIZE; i++)
     66     {
     67       assert(ares__is_list_empty(&(channel->queries_by_timeout[i])));
     68     }
     69 #endif
     70 
     71   ares__destroy_servers_state(channel);
     72 
     73   if (channel->domains) {
     74     for (i = 0; i < channel->ndomains; i++)
     75       free(channel->domains[i]);
     76     free(channel->domains);
     77   }
     78 
     79   if(channel->sortlist)
     80     free(channel->sortlist);
     81 
     82   if (channel->lookups)
     83     free(channel->lookups);
     84 
     85   free(channel);
     86 }
     87 
     88 void ares__destroy_servers_state(ares_channel channel)
     89 {
     90   struct server_state *server;
     91   int i;
     92 
     93   if (channel->servers)
     94     {
     95       for (i = 0; i < channel->nservers; i++)
     96         {
     97           server = &channel->servers[i];
     98           ares__close_sockets(channel, server);
     99           assert(ares__is_list_empty(&server->queries_to_server));
    100         }
    101       free(channel->servers);
    102       channel->servers = NULL;
    103     }
    104   channel->nservers = -1;
    105 }
    106