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                 connman_info("Timeserver %s", value);
 138
 139                 g_free(dhcp->element->ipv4.timeserver);
 140                 dhcp->element->ipv4.timeserver = g_strdup(value);
 141         } else if (g_strcmp0(key, "MTU") == 0) {
 142         } else if (g_strcmp0(key, "PAC") == 0) {
 143                 connman_info("PAC configuration %s", value);
 144
 145                 g_free(dhcp->element->ipv4.pac);
 146                 dhcp->element->ipv4.pac = g_strdup(value);
 147         }
 148 }
 149
 150 /**
 151  * connman_dhcp_bound:
 152  * @dhcp: DHCP structure
 153  *
 154  * Report successful bound of the interface
 155  */
 156 void connman_dhcp_bound(struct connman_dhcp *dhcp)
 157 {
 158         struct connman_element *element;
 159
 160         DBG("dhcp %p", dhcp);
 161
 162         element = connman_element_create(NULL);
 163         if (element == NULL)
 164                 return;
 165
 166         element->type = CONNMAN_ELEMENT_TYPE_IPV4;
 167         element->index = dhcp->index;
 168
 169         connman_element_update(dhcp->element);
 170
 171         if (connman_element_register(element, dhcp->element) < 0)
 172                 connman_element_unref(element);
 173 }
 174
 175 /**
 176  * connman_dhcp_renew:
 177  * @dhcp: DHCP structure
 178  *
 179  * Report successful renew of the interface
 180  */
 181 void connman_dhcp_renew(struct connman_dhcp *dhcp)
 182 {
 183         DBG("dhcp %p", dhcp);
 184
 185         connman_element_update(dhcp->element);
 186 }
 187
 188 /**
 189  * connman_dhcp_fail:
 190  * @dhcp: DHCP structure
 191  *
 192  * Report DHCP failure of the interface
 193  */
 194 void connman_dhcp_fail(struct connman_dhcp *dhcp)
 195 {
 196         DBG("dhcp %p", dhcp);
 197
 198         connman_element_set_error(dhcp->element,
 199                                         CONNMAN_ELEMENT_ERROR_FAILED);
 200 }
 201
 202 /**
 203  * connman_dhcp_get_data:
 204  * @dhcp: DHCP structure
 205  *
 206  * Get private DHCP data pointer
 207  */
 208 void *connman_dhcp_get_data(struct connman_dhcp *dhcp)
 209 {
 210         return dhcp->driver_data;
 211 }
 212
 213 /**
 214  * connman_dhcp_set_data:
 215  * @dhcp: DHCP structure
 216  * @data: data pointer
 217  *
 218  * Set private DHCP data pointer
 219  */
 220 void connman_dhcp_set_data(struct connman_dhcp *dhcp, void *data)
 221 {
 222         dhcp->driver_data = data;
 223 }
 224
 225 static GSList *driver_list = NULL;
 226
 227 static gint compare_priority(gconstpointer a, gconstpointer b)
 228 {
 229         const struct connman_dhcp_driver *driver1 = a;
 230         const struct connman_dhcp_driver *driver2 = b;
 231
 232         return driver2->priority - driver1->priority;
 233 }
 234
 235 /**
 236  * connman_dhcp_driver_register:
 237  * @driver: DHCP driver definition
 238  *
 239  * Register a new DHCP driver
 240  *
 241  * Returns: %0 on success
 242  */
 243 int connman_dhcp_driver_register(struct connman_dhcp_driver *driver)
 244 {
 245         DBG("driver %p name %s", driver, driver->name);
 246
 247         driver_list = g_slist_insert_sorted(driver_list, driver,
 248                                                         compare_priority);
 249
 250         return 0;
 251 }
 252
 253 /**
 254  * connman_dhcp_driver_unregister:
 255  * @driver: DHCP driver definition
 256  *
 257  * Remove a previously registered DHCP driver
 258  */
 259 void connman_dhcp_driver_unregister(struct connman_dhcp_driver *driver)
 260 {
 261         DBG("driver %p name %s", driver, driver->name);
 262
 263         driver_list = g_slist_remove(driver_list, driver);
 264 }
 265
 266 static int dhcp_probe(struct connman_element *element)
 267 {
 268         struct connman_dhcp *dhcp;
 269         GSList *list;
 270
 271         DBG("element %p name %s", element, element->name);
 272
 273         dhcp = g_try_new0(struct connman_dhcp, 1);
 274         if (dhcp == NULL)
 275                 return -ENOMEM;
 276
 277         dhcp->refcount = 1;
 278         dhcp->index = element->index;
 279         dhcp->state = CONNMAN_DHCP_STATE_IDLE;
 280
 281         dhcp->element = element;
 282
 283         connman_element_set_data(element, dhcp);
 284
 285         for (list = driver_list; list; list = list->next) {
 286                 struct connman_dhcp_driver *driver = list->data;
 287
 288                 DBG("driver %p name %s", driver, driver->name);
 289
 290                 if (driver->request(dhcp) == 0) {
 291                         dhcp->driver = driver;
 292                         break;
 293                 }
 294         }
 295
 296         if (dhcp->driver == NULL) {
 297                 connman_dhcp_unref(dhcp);
 298                 return -ENOENT;
 299         }
 300
 301         return 0;
 302 }
 303
 304 static void dhcp_remove(struct connman_element *element)
 305 {
 306         struct connman_dhcp *dhcp = connman_element_get_data(element);
 307
 308         DBG("element %p name %s", element, element->name);
 309
 310         connman_element_set_data(element, NULL);
 311
 312         if (dhcp->driver) {
 313                 dhcp->driver->release(dhcp);
 314                 dhcp->driver = NULL;
 315         }
 316
 317         connman_dhcp_unref(dhcp);
 318 }
 319
 320 static void dhcp_change(struct connman_element *element)
 321 {
 322         DBG("element %p name %s", element, element->name);
 323
 324         if (element->state == CONNMAN_ELEMENT_STATE_ERROR)
 325                 connman_element_set_error(element->parent,
 326                                         CONNMAN_ELEMENT_ERROR_DHCP_FAILED);
 327 }
 328
 329 static struct connman_driver dhcp_driver = {
 330         .name           = "dhcp",
 331         .type           = CONNMAN_ELEMENT_TYPE_DHCP,
 332         .priority       = CONNMAN_DRIVER_PRIORITY_LOW,
 333         .probe          = dhcp_probe,
 334         .remove         = dhcp_remove,
 335         .change         = dhcp_change,
 336 };
 337
 338 int __connman_dhcp_init(void)
 339 {
 340         return connman_driver_register(&dhcp_driver);
 341 }
 342
 343 void __connman_dhcp_cleanup(void)
 344 {
 345         connman_driver_unregister(&dhcp_driver);
 346 }