src/dhcp.c

   1 /*
   2  *
   3  *  Connection Manager
   4  *
   5  *  Copyright (C) 2007-2010  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 <glib.h>
  27
  28 #include "connman.h"
  29
  30 struct connman_dhcp {
  31         gint refcount;
  32         int index;
  33         enum connman_dhcp_state state;
  34
  35         struct connman_element *element;
  36
  37         struct connman_dhcp_driver *driver;
  38         void *driver_data;
  39 };
  40
  41 /**
  42  * connman_dhcp_ref:
  43  * @dhcp: DHCP structure
  44  *
  45  * Increase reference counter of DHCP
  46  */
  47 struct connman_dhcp *connman_dhcp_ref(struct connman_dhcp *dhcp)
  48 {
  49         g_atomic_int_inc(&dhcp->refcount);
  50
  51         return dhcp;
  52 }
  53
  54 /**
  55  * connman_dhcp_unref:
  56  * @dhcp: DHCP structure
  57  *
  58  * Decrease reference counter of DHCP
  59  */
  60 void connman_dhcp_unref(struct connman_dhcp *dhcp)
  61 {
  62         if (g_atomic_int_dec_and_test(&dhcp->refcount) == TRUE)
  63                 g_free(dhcp);
  64 }
  65
  66 /**
  67  * connman_dhcp_get_index:
  68  * @dhcp: DHCP structure
  69  *
  70  * Get network index of DHCP
  71  */
  72 int connman_dhcp_get_index(struct connman_dhcp *dhcp)
  73 {
  74         return dhcp->index;
  75 }
  76
  77 /**
  78  * connman_dhcp_get_interface:
  79  * @dhcp: DHCP structure
  80  *
  81  * Get network interface of DHCP
  82  */
  83 char *connman_dhcp_get_interface(struct connman_dhcp *dhcp)
  84 {
  85         return connman_inet_ifname(dhcp->index);
  86 }
  87
  88 /**
  89  * connman_dhcp_set_value:
  90  * @dhcp: DHCP structure
  91  * @key: unique identifier
  92  * @value: string value
  93  *
  94  * Set string value for specific key
  95  */
  96 void connman_dhcp_set_value(struct connman_dhcp *dhcp,
  97                                         const char *key, const char *value)
  98 {
  99         char **nameservers;
 100
 101         if (g_strcmp0(key, "Address") == 0) {
 102                 g_free(dhcp->element->ipv4.address);
 103                 dhcp->element->ipv4.address = g_strdup(value);
 104         } else if (g_strcmp0(key, "Netmask") == 0) {
 105                 g_free(dhcp->element->ipv4.netmask);
 106                 dhcp->element->ipv4.netmask = g_strdup(value);
 107         } else if (g_strcmp0(key, "Gateway") == 0) {
 108                 g_free(dhcp->element->ipv4.gateway);
 109                 dhcp->element->ipv4.gateway = g_strdup(value);
 110         } else if (g_strcmp0(key, "Network") == 0) {
 111                 g_free(dhcp->element->ipv4.network);
 112                 dhcp->element->ipv4.network = g_strdup(value);
 113         } else if (g_strcmp0(key, "Broadcast") == 0) {
 114                 g_free(dhcp->element->ipv4.broadcast);
 115                 dhcp->element->ipv4.broadcast = g_strdup(value);
 116         } else if (g_strcmp0(key, "Nameserver") == 0) {
 117                 g_free(dhcp->element->ipv4.nameserver);
 118                 nameservers = g_strsplit_set(value, " ", 0);
 119                 /* FIXME: The ipv4 structure can only hold one nameserver, so
 120                  * we are only able to pass along the first nameserver sent by
 121                  * the DHCP server.  If this situation changes, we should
 122                  * retain all of them.
 123                  */
 124                 dhcp->element->ipv4.nameserver = g_strdup(nameservers[0]);
 125                 g_strfreev(nameservers);
 126         } else if (g_strcmp0(key, "Domainname") == 0) {
 127                 __connman_utsname_set_domainname(value);
 128         } else if (g_strcmp0(key, "Hostname") == 0) {
 129                 __connman_utsname_set_hostname(value);
 130         } else if (g_strcmp0(key, "Timeserver") == 0) {
 131                 g_free(dhcp->element->ipv4.timeserver);
 132                 dhcp->element->ipv4.timeserver = g_strdup(value);
 133         } else if (g_strcmp0(key, "MTU") == 0) {
 134         } else if (g_strcmp0(key, "PAC") == 0) {
 135                 connman_info("PAC configuration %s", value);
 136
 137                 g_free(dhcp->element->ipv4.pac);
 138                 dhcp->element->ipv4.pac = g_strdup(value);
 139         }
 140 }
 141
 142 /**
 143  * connman_dhcp_bound:
 144  * @dhcp: DHCP structure
 145  *
 146  * Report successful bound of the interface
 147  */
 148 void connman_dhcp_bound(struct connman_dhcp *dhcp)
 149 {
 150         struct connman_element *element;
 151
 152         DBG("dhcp %p", dhcp);
 153
 154         element = connman_element_create(NULL);
 155         if (element == NULL)
 156                 return;
 157
 158         element->type = CONNMAN_ELEMENT_TYPE_IPV4;
 159         element->index = dhcp->index;
 160
 161         connman_element_update(dhcp->element);
 162
 163         if (connman_element_register(element, dhcp->element) < 0)
 164                 connman_element_unref(element);
 165 }
 166
 167 /**
 168  * connman_dhcp_renew:
 169  * @dhcp: DHCP structure
 170  *
 171  * Report successful renew of the interface
 172  */
 173 void connman_dhcp_renew(struct connman_dhcp *dhcp)
 174 {
 175         DBG("dhcp %p", dhcp);
 176
 177         connman_element_update(dhcp->element);
 178 }
 179
 180 /**
 181  * connman_dhcp_fail:
 182  * @dhcp: DHCP structure
 183  *
 184  * Report DHCP failure of the interface
 185  */
 186 void connman_dhcp_fail(struct connman_dhcp *dhcp)
 187 {
 188         DBG("dhcp %p", dhcp);
 189
 190         connman_element_set_error(dhcp->element,
 191                                         CONNMAN_ELEMENT_ERROR_FAILED);
 192 }
 193
 194 /**
 195  * connman_dhcp_get_data:
 196  * @dhcp: DHCP structure
 197  *
 198  * Get private DHCP data pointer
 199  */
 200 void *connman_dhcp_get_data(struct connman_dhcp *dhcp)
 201 {
 202         return dhcp->driver_data;
 203 }
 204
 205 /**
 206  * connman_dhcp_set_data:
 207  * @dhcp: DHCP structure
 208  * @data: data pointer
 209  *
 210  * Set private DHCP data pointer
 211  */
 212 void connman_dhcp_set_data(struct connman_dhcp *dhcp, void *data)
 213 {
 214         dhcp->driver_data = data;
 215 }
 216
 217 static GSList *driver_list = NULL;
 218
 219 static gint compare_priority(gconstpointer a, gconstpointer b)
 220 {
 221         const struct connman_dhcp_driver *driver1 = a;
 222         const struct connman_dhcp_driver *driver2 = b;
 223
 224         return driver2->priority - driver1->priority;
 225 }
 226
 227 /**
 228  * connman_dhcp_driver_register:
 229  * @driver: DHCP driver definition
 230  *
 231  * Register a new DHCP driver
 232  *
 233  * Returns: %0 on success
 234  */
 235 int connman_dhcp_driver_register(struct connman_dhcp_driver *driver)
 236 {
 237         DBG("driver %p name %s", driver, driver->name);
 238
 239         driver_list = g_slist_insert_sorted(driver_list, driver,
 240                                                         compare_priority);
 241
 242         return 0;
 243 }
 244
 245 /**
 246  * connman_dhcp_driver_unregister:
 247  * @driver: DHCP driver definition
 248  *
 249  * Remove a previously registered DHCP driver
 250  */
 251 void connman_dhcp_driver_unregister(struct connman_dhcp_driver *driver)
 252 {
 253         DBG("driver %p name %s", driver, driver->name);
 254
 255         driver_list = g_slist_remove(driver_list, driver);
 256 }
 257
 258 static int dhcp_probe(struct connman_element *element)
 259 {
 260         struct connman_dhcp *dhcp;
 261         GSList *list;
 262
 263         DBG("element %p name %s", element, element->name);
 264
 265         dhcp = g_try_new0(struct connman_dhcp, 1);
 266         if (dhcp == NULL)
 267                 return -ENOMEM;
 268
 269         dhcp->refcount = 1;
 270         dhcp->index = element->index;
 271         dhcp->state = CONNMAN_DHCP_STATE_IDLE;
 272
 273         dhcp->element = element;
 274
 275         connman_element_set_data(element, dhcp);
 276
 277         for (list = driver_list; list; list = list->next) {
 278                 struct connman_dhcp_driver *driver = list->data;
 279
 280                 DBG("driver %p name %s", driver, driver->name);
 281
 282                 if (driver->request(dhcp) == 0) {
 283                         dhcp->driver = driver;
 284                         break;
 285                 }
 286         }
 287
 288         if (dhcp->driver == NULL) {
 289                 connman_dhcp_unref(dhcp);
 290                 return -ENOENT;
 291         }
 292
 293         return 0;
 294 }
 295
 296 static void dhcp_remove(struct connman_element *element)
 297 {
 298         struct connman_dhcp *dhcp = connman_element_get_data(element);
 299
 300         DBG("element %p name %s", element, element->name);
 301
 302         connman_element_set_data(element, NULL);
 303
 304         if (dhcp->driver) {
 305                 dhcp->driver->release(dhcp);
 306                 dhcp->driver = NULL;
 307         }
 308
 309         connman_dhcp_unref(dhcp);
 310 }
 311
 312 static void dhcp_change(struct connman_element *element)
 313 {
 314         DBG("element %p name %s", element, element->name);
 315
 316         if (element->state == CONNMAN_ELEMENT_STATE_ERROR)
 317                 connman_element_set_error(element->parent,
 318                                         CONNMAN_ELEMENT_ERROR_DHCP_FAILED);
 319 }
 320
 321 static struct connman_driver dhcp_driver = {
 322         .name           = "dhcp",
 323         .type           = CONNMAN_ELEMENT_TYPE_DHCP,
 324         .priority       = CONNMAN_DRIVER_PRIORITY_LOW,
 325         .probe          = dhcp_probe,
 326         .remove         = dhcp_remove,
 327         .change         = dhcp_change,
 328 };
 329
 330 int __connman_dhcp_init(void)
 331 {
 332         return connman_driver_register(&dhcp_driver);
 333 }
 334
 335 void __connman_dhcp_cleanup(void)
 336 {
 337         connman_driver_unregister(&dhcp_driver);
 338 }