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                 g_free(dhcp->element->domainname);
 128                 dhcp->element->domainname = g_strdup(value);
 129
 130                 __connman_utsname_set_domainname(value);
 131         } else if (g_strcmp0(key, "Hostname") == 0) {
 132                 g_free(dhcp->element->hostname);
 133                 dhcp->element->hostname = g_strdup(value);
 134
 135                 __connman_utsname_set_hostname(value);
 136         } else if (g_strcmp0(key, "Timeserver") == 0) {
 137                 g_free(dhcp->element->ipv4.timeserver);
 138                 dhcp->element->ipv4.timeserver = g_strdup(value);
 139         } else if (g_strcmp0(key, "MTU") == 0) {
 140         } else if (g_strcmp0(key, "PAC") == 0) {
 141                 connman_info("PAC configuration %s", value);
 142
 143                 g_free(dhcp->element->ipv4.pac);
 144                 dhcp->element->ipv4.pac = g_strdup(value);
 145         }
 146 }
 147
 148 /**
 149  * connman_dhcp_bound:
 150  * @dhcp: DHCP structure
 151  *
 152  * Report successful bound of the interface
 153  */
 154 void connman_dhcp_bound(struct connman_dhcp *dhcp)
 155 {
 156         struct connman_element *element;
 157
 158         DBG("dhcp %p", dhcp);
 159
 160         element = connman_element_create(NULL);
 161         if (element == NULL)
 162                 return;
 163
 164         element->type = CONNMAN_ELEMENT_TYPE_IPV4;
 165         element->index = dhcp->index;
 166
 167         connman_element_update(dhcp->element);
 168
 169         if (connman_element_register(element, dhcp->element) < 0)
 170                 connman_element_unref(element);
 171 }
 172
 173 /**
 174  * connman_dhcp_renew:
 175  * @dhcp: DHCP structure
 176  *
 177  * Report successful renew of the interface
 178  */
 179 void connman_dhcp_renew(struct connman_dhcp *dhcp)
 180 {
 181         DBG("dhcp %p", dhcp);
 182
 183         connman_element_update(dhcp->element);
 184 }
 185
 186 /**
 187  * connman_dhcp_fail:
 188  * @dhcp: DHCP structure
 189  *
 190  * Report DHCP failure of the interface
 191  */
 192 void connman_dhcp_fail(struct connman_dhcp *dhcp)
 193 {
 194         DBG("dhcp %p", dhcp);
 195
 196         connman_element_set_error(dhcp->element,
 197                                         CONNMAN_ELEMENT_ERROR_FAILED);
 198 }
 199
 200 /**
 201  * connman_dhcp_get_data:
 202  * @dhcp: DHCP structure
 203  *
 204  * Get private DHCP data pointer
 205  */
 206 void *connman_dhcp_get_data(struct connman_dhcp *dhcp)
 207 {
 208         return dhcp->driver_data;
 209 }
 210
 211 /**
 212  * connman_dhcp_set_data:
 213  * @dhcp: DHCP structure
 214  * @data: data pointer
 215  *
 216  * Set private DHCP data pointer
 217  */
 218 void connman_dhcp_set_data(struct connman_dhcp *dhcp, void *data)
 219 {
 220         dhcp->driver_data = data;
 221 }
 222
 223 static GSList *driver_list = NULL;
 224
 225 static gint compare_priority(gconstpointer a, gconstpointer b)
 226 {
 227         const struct connman_dhcp_driver *driver1 = a;
 228         const struct connman_dhcp_driver *driver2 = b;
 229
 230         return driver2->priority - driver1->priority;
 231 }
 232
 233 /**
 234  * connman_dhcp_driver_register:
 235  * @driver: DHCP driver definition
 236  *
 237  * Register a new DHCP driver
 238  *
 239  * Returns: %0 on success
 240  */
 241 int connman_dhcp_driver_register(struct connman_dhcp_driver *driver)
 242 {
 243         DBG("driver %p name %s", driver, driver->name);
 244
 245         driver_list = g_slist_insert_sorted(driver_list, driver,
 246                                                         compare_priority);
 247
 248         return 0;
 249 }
 250
 251 /**
 252  * connman_dhcp_driver_unregister:
 253  * @driver: DHCP driver definition
 254  *
 255  * Remove a previously registered DHCP driver
 256  */
 257 void connman_dhcp_driver_unregister(struct connman_dhcp_driver *driver)
 258 {
 259         DBG("driver %p name %s", driver, driver->name);
 260
 261         driver_list = g_slist_remove(driver_list, driver);
 262 }
 263
 264 static int dhcp_probe(struct connman_element *element)
 265 {
 266         struct connman_dhcp *dhcp;
 267         GSList *list;
 268
 269         DBG("element %p name %s", element, element->name);
 270
 271         dhcp = g_try_new0(struct connman_dhcp, 1);
 272         if (dhcp == NULL)
 273                 return -ENOMEM;
 274
 275         dhcp->refcount = 1;
 276         dhcp->index = element->index;
 277         dhcp->state = CONNMAN_DHCP_STATE_IDLE;
 278
 279         dhcp->element = element;
 280
 281         connman_element_set_data(element, dhcp);
 282
 283         for (list = driver_list; list; list = list->next) {
 284                 struct connman_dhcp_driver *driver = list->data;
 285
 286                 DBG("driver %p name %s", driver, driver->name);
 287
 288                 if (driver->request(dhcp) == 0) {
 289                         dhcp->driver = driver;
 290                         break;
 291                 }
 292         }
 293
 294         if (dhcp->driver == NULL) {
 295                 connman_dhcp_unref(dhcp);
 296                 return -ENOENT;
 297         }
 298
 299         return 0;
 300 }
 301
 302 static void dhcp_remove(struct connman_element *element)
 303 {
 304         struct connman_dhcp *dhcp = connman_element_get_data(element);
 305
 306         DBG("element %p name %s", element, element->name);
 307
 308         connman_element_set_data(element, NULL);
 309
 310         if (dhcp->driver) {
 311                 dhcp->driver->release(dhcp);
 312                 dhcp->driver = NULL;
 313         }
 314
 315         connman_dhcp_unref(dhcp);
 316 }
 317
 318 static void dhcp_change(struct connman_element *element)
 319 {
 320         DBG("element %p name %s", element, element->name);
 321
 322         if (element->state == CONNMAN_ELEMENT_STATE_ERROR)
 323                 connman_element_set_error(element->parent,
 324                                         CONNMAN_ELEMENT_ERROR_DHCP_FAILED);
 325 }
 326
 327 static struct connman_driver dhcp_driver = {
 328         .name           = "dhcp",
 329         .type           = CONNMAN_ELEMENT_TYPE_DHCP,
 330         .priority       = CONNMAN_DRIVER_PRIORITY_LOW,
 331         .probe          = dhcp_probe,
 332         .remove         = dhcp_remove,
 333         .change         = dhcp_change,
 334 };
 335
 336 int __connman_dhcp_init(void)
 337 {
 338         return connman_driver_register(&dhcp_driver);
 339 }
 340
 341 void __connman_dhcp_cleanup(void)
 342 {
 343         connman_driver_unregister(&dhcp_driver);
 344 }