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