git.maemo.org Git - connman/blob - 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 <stdio.h>
  27 #include <errno.h>
  28 #include <fcntl.h>
  29 #include <unistd.h>
  30 #include <string.h>
  31 #include <sys/stat.h>
  32
  33 #include "connman.h"
  34
  35 struct entry_data {
  36         struct connman_resolver *resolver;
  37         char *interface;
  38         char *domain;
  39         char *server;
  40 };
  41
  42 static GSList *entry_list = NULL;
  43 static GSList *resolver_list = NULL;
  44
  45 static void remove_entries(GSList *entries)
  46 {
  47         GSList *list;
  48
  49         for (list = entries; list; list = list->next) {
  50                 struct entry_data *entry = list->data;
  51                 struct connman_resolver *resolver = entry->resolver;
  52
  53                 entry_list = g_slist_remove(entry_list, entry);
  54
  55                 if (resolver->remove)
  56                         resolver->remove(entry->interface, entry->domain,
  57                                                                 entry->server);
  58
  59                 g_free(entry->server);
  60                 g_free(entry->domain);
  61                 g_free(entry->interface);
  62                 g_free(entry);
  63         }
  64
  65         g_slist_free(entries);
  66 }
  67
  68 static gint compare_priority(gconstpointer a, gconstpointer b)
  69 {
  70         const struct connman_resolver *resolver1 = a;
  71         const struct connman_resolver *resolver2 = b;
  72
  73         return resolver2->priority - resolver1->priority;
  74 }
  75
  76 /**
  77  * connman_resolver_register:
  78  * @resolver: resolver module
  79  *
  80  * Register a new resolver module
  81  *
  82  * Returns: %0 on success
  83  */
  84 int connman_resolver_register(struct connman_resolver *resolver)
  85 {
  86         GSList *list;
  87
  88         DBG("resolver %p name %s", resolver, resolver->name);
  89
  90         resolver_list = g_slist_insert_sorted(resolver_list, resolver,
  91                                                         compare_priority);
  92
  93         if (resolver->append == NULL)
  94                 return 0;
  95
  96         for (list = entry_list; list; list = list->next) {
  97                 struct entry_data *entry = list->data;
  98
  99                 if (entry->resolver)
 100                         continue;
 101
 102                 if (resolver->append(entry->interface, entry->domain,
 103                                                         entry->server) == 0)
 104                         entry->resolver = resolver;
 105         }
 106
 107         return 0;
 108 }
 109
 110 /**
 111  * connman_resolver_unregister:
 112  * @resolver: resolver module
 113  *
 114  * Remove a previously registered resolver module
 115  */
 116 void connman_resolver_unregister(struct connman_resolver *resolver)
 117 {
 118         GSList *list, *matches = NULL;
 119
 120         DBG("resolver %p name %s", resolver, resolver->name);
 121
 122         resolver_list = g_slist_remove(resolver_list, resolver);
 123
 124         for (list = entry_list; list; list = list->next) {
 125                 struct entry_data *entry = list->data;
 126
 127                 if (entry->resolver != resolver)
 128                         continue;
 129
 130                 matches = g_slist_append(matches, entry);
 131         }
 132
 133         remove_entries(matches);
 134 }
 135
 136 /**
 137  * connman_resolver_append:
 138  * @interface: network interface
 139  * @domain: domain limitation
 140  * @server: server address
 141  *
 142  * Append resolver server address to current list
 143  */
 144 int connman_resolver_append(const char *interface, const char *domain,
 145                                                         const char *server)
 146 {
 147         struct entry_data *entry;
 148         GSList *list;
 149
 150         DBG("interface %s domain %s server %s", interface, domain, server);
 151
 152         entry = g_try_new0(struct entry_data, 1);
 153         if (entry == NULL)
 154                 return -ENOMEM;
 155
 156         entry->interface = g_strdup(interface);
 157         entry->domain = g_strdup(domain);
 158         entry->server = g_strdup(server);
 159
 160         entry_list = g_slist_append(entry_list, entry);
 161
 162         for (list = resolver_list; list; list = list->next) {
 163                 struct connman_resolver *resolver = list->data;
 164
 165                 if (resolver->append == NULL)
 166                         continue;
 167
 168                 if (resolver->append(interface, domain, server) == 0) {
 169                         entry->resolver = resolver;
 170                         break;
 171                 }
 172         }
 173
 174         return 0;
 175 }
 176
 177 /**
 178  * connman_resolver_remove_all:
 179  * @interface: network interface
 180  *
 181  * Remove all resolver server address for the specified interface
 182  */
 183 int connman_resolver_remove_all(const char *interface)
 184 {
 185         GSList *list, *matches = NULL;
 186
 187         DBG("interface %s", interface);
 188
 189         for (list = entry_list; list; list = list->next) {
 190                 struct entry_data *entry = list->data;
 191
 192                 if (g_str_equal(entry->interface, interface) == FALSE)
 193                         continue;
 194
 195                 matches = g_slist_append(matches, entry);
 196         }
 197
 198         remove_entries(matches);
 199
 200         return 0;
 201 }
 202
 203 static int selftest_append(const char *interface, const char *domain,
 204                                                         const char *server)
 205 {
 206         DBG("server %s", server);
 207
 208         return 0;
 209 }
 210
 211 static int selftest_remove(const char *interface, const char *domain,
 212                                                         const char *server)
 213 {
 214         DBG("server %s", server);
 215
 216         return 0;
 217 }
 218
 219 static struct connman_resolver selftest_resolver = {
 220         .name     = "selftest",
 221         .priority = CONNMAN_RESOLVER_PRIORITY_HIGH + 42,
 222         .append   = selftest_append,
 223         .remove   = selftest_remove,
 224 };
 225
 226 int __connman_resolver_selftest(void)
 227 {
 228         connman_resolver_append("wlan0", "lwn.net", "192.168.0.1");
 229
 230         connman_resolver_register(&selftest_resolver);
 231
 232         connman_resolver_append("eth0", "moblin.org", "192.168.42.1");
 233         connman_resolver_append("wlan0", "lwn.net", "192.168.0.2");
 234
 235         connman_resolver_remove_all("wlan0");
 236
 237         connman_resolver_unregister(&selftest_resolver);
 238
 239         return 0;
 240 }
 241
 242 static int resolvfile_append(const char *interface, const char *domain,
 243                                                         const char *server)
 244 {
 245         char *cmd;
 246         int fd, len, err;
 247
 248         DBG("interface %s server %s", interface, server);
 249
 250         fd = open("/etc/resolv.conf", O_RDWR | O_CREAT,
 251                                         S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
 252         if (fd < 0)
 253                 return -errno;
 254
 255         err = ftruncate(fd, 0);
 256
 257         cmd = g_strdup_printf("# Generated by Connection Manager\n"
 258                                                 "domain localdomain\n"
 259                                                 "search localdomain\n"
 260                                                 "nameserver %s\n", server);
 261
 262         len = write(fd, cmd, strlen(cmd));
 263
 264         g_free(cmd);
 265
 266         close(fd);
 267
 268         return 0;
 269 }
 270
 271 static int resolvfile_remove(const char *interface, const char *domain,
 272                                                         const char *server)
 273 {
 274         DBG("interface %s server %s", interface, server);
 275
 276         return 0;
 277 }
 278
 279 static struct connman_resolver resolvfile_resolver = {
 280         .name           = "resolvfile",
 281         .priority       = CONNMAN_RESOLVER_PRIORITY_LOW,
 282         .append         = resolvfile_append,
 283         .remove         = resolvfile_remove,
 284 };
 285
 286 int __connman_resolver_init(void)
 287 {
 288         DBG("");
 289
 290         return connman_resolver_register(&resolvfile_resolver);
 291 }
 292
 293 void __connman_resolver_cleanup(void)
 294 {
 295         DBG("");
 296
 297         connman_resolver_unregister(&resolvfile_resolver);
 298 }