src/resolver.c

   1 /*
   2  *
   3  *  Connection Manager
   4  *
   5  *  Copyright (C) 2007-2009  Intel Corporation. All rights reserved.
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License version 2 as
   9  *  published by the Free Software Foundation.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  19  *
  20  */
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include "connman.h"
  27
  28 struct entry_data {
  29         struct connman_resolver *resolver;
  30         char *interface;
  31         char *domain;
  32         char *server;
  33 };
  34
  35 static GSList *entry_list = NULL;
  36 static GSList *resolver_list = NULL;
  37
  38 static void remove_entries(GSList *entries)
  39 {
  40         GSList *list;
  41
  42         for (list = entries; list; list = list->next) {
  43                 struct entry_data *entry = list->data;
  44                 struct connman_resolver *resolver = entry->resolver;
  45
  46                 entry_list = g_slist_remove(entry_list, entry);
  47
  48                 if (resolver->remove)
  49                         resolver->remove(entry->interface, entry->domain,
  50                                                                 entry->server);
  51
  52                 g_free(entry->server);
  53                 g_free(entry->domain);
  54                 g_free(entry->interface);
  55                 g_free(entry);
  56         }
  57
  58         g_slist_free(entries);
  59 }
  60
  61 static gint compare_priority(gconstpointer a, gconstpointer b)
  62 {
  63         const struct connman_resolver *resolver1 = a;
  64         const struct connman_resolver *resolver2 = b;
  65
  66         return resolver2->priority - resolver1->priority;
  67 }
  68
  69 /**
  70  * connman_resolver_register:
  71  * @resolver: resolver module
  72  *
  73  * Register a new resolver module
  74  *
  75  * Returns: %0 on success
  76  */
  77 int connman_resolver_register(struct connman_resolver *resolver)
  78 {
  79         GSList *list;
  80
  81         DBG("resolver %p name %s", resolver, resolver->name);
  82
  83         resolver_list = g_slist_insert_sorted(resolver_list, resolver,
  84                                                         compare_priority);
  85
  86         if (resolver->append == NULL)
  87                 return 0;
  88
  89         for (list = entry_list; list; list = list->next) {
  90                 struct entry_data *entry = list->data;
  91
  92                 if (entry->resolver)
  93                         continue;
  94
  95                 if (resolver->append(entry->interface, entry->domain,
  96                                                         entry->server) == 0)
  97                         entry->resolver = resolver;
  98         }
  99
 100         return 0;
 101 }
 102
 103 /**
 104  * connman_resolver_unregister:
 105  * @resolver: resolver module
 106  *
 107  * Remove a previously registered resolver module
 108  */
 109 void connman_resolver_unregister(struct connman_resolver *resolver)
 110 {
 111         GSList *list, *matches = NULL;
 112
 113         DBG("resolver %p name %s", resolver, resolver->name);
 114
 115         resolver_list = g_slist_remove(resolver_list, resolver);
 116
 117         for (list = entry_list; list; list = list->next) {
 118                 struct entry_data *entry = list->data;
 119
 120                 if (entry->resolver != resolver)
 121                         continue;
 122
 123                 matches = g_slist_append(matches, entry);
 124         }
 125
 126         remove_entries(matches);
 127 }
 128
 129 /**
 130  * connman_resolver_append:
 131  * @interface: network interface
 132  * @domain: domain limitation
 133  * @server: server address
 134  *
 135  * Append resolver server address to current list
 136  */
 137 int connman_resolver_append(const char *interface, const char *domain,
 138                                                         const char *server)
 139 {
 140         struct entry_data *entry;
 141         GSList *list;
 142
 143         DBG("interface %s domain %s server %s", interface, domain, server);
 144
 145         entry = g_try_new0(struct entry_data, 1);
 146         if (entry == NULL)
 147                 return -ENOMEM;
 148
 149         entry->interface = g_strdup(interface);
 150         entry->domain = g_strdup(domain);
 151         entry->server = g_strdup(server);
 152
 153         entry_list = g_slist_append(entry_list, entry);
 154
 155         for (list = resolver_list; list; list = list->next) {
 156                 struct connman_resolver *resolver = list->data;
 157
 158                 if (resolver->append == NULL)
 159                         continue;
 160
 161                 if (resolver->append(interface, domain, server) == 0) {
 162                         entry->resolver = resolver;
 163                         break;
 164                 }
 165         }
 166
 167         return 0;
 168 }
 169
 170 /**
 171  * connman_resolver_remove_all:
 172  * @interface: network interface
 173  *
 174  * Remove all resolver server address for the specified interface
 175  */
 176 int connman_resolver_remove_all(const char *interface)
 177 {
 178         GSList *list, *matches = NULL;
 179
 180         DBG("interface %s", interface);
 181
 182         for (list = entry_list; list; list = list->next) {
 183                 struct entry_data *entry = list->data;
 184
 185                 if (g_str_equal(entry->interface, interface) == FALSE)
 186                         continue;
 187
 188                 matches = g_slist_append(matches, entry);
 189         }
 190
 191         remove_entries(matches);
 192
 193         return 0;
 194 }
 195
 196 static int selftest_append(const char *interface, const char *domain,
 197                                                         const char *server)
 198 {
 199         DBG("server %s", server);
 200
 201         return 0;
 202 }
 203
 204 static int selftest_remove(const char *interface, const char *domain,
 205                                                         const char *server)
 206 {
 207         DBG("server %s", server);
 208
 209         return 0;
 210 }
 211
 212 static struct connman_resolver selftest_resolver = {
 213         .name     = "selftest",
 214         .priority = CONNMAN_RESOLVER_PRIORITY_HIGH + 42,
 215         .append   = selftest_append,
 216         .remove   = selftest_remove,
 217 };
 218
 219 int __connman_resolver_selftest(void)
 220 {
 221         connman_resolver_append("wlan0", "lwn.net", "192.168.0.1");
 222
 223         connman_resolver_register(&selftest_resolver);
 224
 225         connman_resolver_append("eth0", "moblin.org", "192.168.42.1");
 226         connman_resolver_append("wlan0", "lwn.net", "192.168.0.2");
 227
 228         connman_resolver_remove_all("wlan0");
 229
 230         connman_resolver_unregister(&selftest_resolver);
 231
 232         return 0;
 233 }