src/dhcp.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 <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         if (g_strcmp0(key, "Address") == 0) {
 100                 g_free(dhcp->element->ipv4.address);
 101                 dhcp->element->ipv4.address = g_strdup(value);
 102         } else if (g_strcmp0(key, "Netmask") == 0) {
 103                 g_free(dhcp->element->ipv4.netmask);
 104                 dhcp->element->ipv4.netmask = g_strdup(value);
 105         } else if (g_strcmp0(key, "Gateway") == 0) {
 106                 g_free(dhcp->element->ipv4.gateway);
 107                 dhcp->element->ipv4.gateway = g_strdup(value);
 108         } else if (g_strcmp0(key, "Network") == 0) {
 109                 g_free(dhcp->element->ipv4.network);
 110                 dhcp->element->ipv4.network = g_strdup(value);
 111         } else if (g_strcmp0(key, "Broadcast") == 0) {
 112                 g_free(dhcp->element->ipv4.broadcast);
 113                 dhcp->element->ipv4.broadcast = g_strdup(value);
 114         } else if (g_strcmp0(key, "Nameserver") == 0) {
 115                 g_free(dhcp->element->ipv4.nameserver);
 116                 dhcp->element->ipv4.nameserver = g_strdup(value);
 117         }
 118 }
 119
 120 /**
 121  * connman_dhcp_bound:
 122  * @dhcp: DHCP structure
 123  *
 124  * Report successful bound of the interface
 125  */
 126 void connman_dhcp_bound(struct connman_dhcp *dhcp)
 127 {
 128         struct connman_element *element;
 129
 130         DBG("dhcp %p", dhcp);
 131
 132         element = connman_element_create(NULL);
 133         if (element == NULL)
 134                 return;
 135
 136         element->type = CONNMAN_ELEMENT_TYPE_IPV4;
 137         element->index = dhcp->index;
 138
 139         connman_element_update(dhcp->element);
 140
 141         if (connman_element_register(element, dhcp->element) < 0)
 142                 connman_element_unref(element);
 143 }
 144
 145 /**
 146  * connman_dhcp_renew:
 147  * @dhcp: DHCP structure
 148  *
 149  * Report successful renew of the interface
 150  */
 151 void connman_dhcp_renew(struct connman_dhcp *dhcp)
 152 {
 153         DBG("dhcp %p", dhcp);
 154
 155         connman_element_update(dhcp->element);
 156 }
 157
 158 /**
 159  * connman_dhcp_fail:
 160  * @dhcp: DHCP structure
 161  *
 162  * Report DHCP failure of the interface
 163  */
 164 void connman_dhcp_fail(struct connman_dhcp *dhcp)
 165 {
 166         DBG("dhcp %p", dhcp);
 167
 168         connman_element_set_error(dhcp->element,
 169                                         CONNMAN_ELEMENT_ERROR_FAILED);
 170 }
 171
 172 static GSList *driver_list = NULL;
 173
 174 static gint compare_priority(gconstpointer a, gconstpointer b)
 175 {
 176         const struct connman_dhcp_driver *driver1 = a;
 177         const struct connman_dhcp_driver *driver2 = b;
 178
 179         return driver2->priority - driver1->priority;
 180 }
 181
 182 /**
 183  * connman_dhcp_driver_register:
 184  * @driver: DHCP driver definition
 185  *
 186  * Register a new DHCP driver
 187  *
 188  * Returns: %0 on success
 189  */
 190 int connman_dhcp_driver_register(struct connman_dhcp_driver *driver)
 191 {
 192         DBG("driver %p name %s", driver, driver->name);
 193
 194         driver_list = g_slist_insert_sorted(driver_list, driver,
 195                                                         compare_priority);
 196
 197         return 0;
 198 }
 199
 200 /**
 201  * connman_dhcp_driver_unregister:
 202  * @driver: DHCP driver definition
 203  *
 204  * Remove a previously registered DHCP driver
 205  */
 206 void connman_dhcp_driver_unregister(struct connman_dhcp_driver *driver)
 207 {
 208         DBG("driver %p name %s", driver, driver->name);
 209
 210         driver_list = g_slist_remove(driver_list, driver);
 211 }
 212
 213 static int dhcp_probe(struct connman_element *element)
 214 {
 215         struct connman_dhcp *dhcp;
 216         GSList *list;
 217
 218         DBG("element %p name %s", element, element->name);
 219
 220         dhcp = g_try_new0(struct connman_dhcp, 1);
 221         if (dhcp == NULL)
 222                 return -ENOMEM;
 223
 224         dhcp->refcount = 1;
 225         dhcp->index = element->index;
 226         dhcp->state = CONNMAN_DHCP_STATE_IDLE;
 227
 228         dhcp->element = element;
 229
 230         connman_element_set_data(element, dhcp);
 231
 232         for (list = driver_list; list; list = list->next) {
 233                 struct connman_dhcp_driver *driver = list->data;
 234
 235                 DBG("driver %p name %s", driver, driver->name);
 236
 237                 if (driver->request(dhcp) == 0) {
 238                         dhcp->driver = driver;
 239                         break;
 240                 }
 241         }
 242
 243         if (dhcp->driver == NULL) {
 244                 connman_dhcp_unref(dhcp);
 245                 return -ENOENT;
 246         }
 247
 248         return 0;
 249 }
 250
 251 static void dhcp_remove(struct connman_element *element)
 252 {
 253         struct connman_dhcp *dhcp = connman_element_get_data(element);
 254
 255         DBG("element %p name %s", element, element->name);
 256
 257         connman_element_set_data(element, NULL);
 258
 259         if (dhcp->driver) {
 260                 dhcp->driver->release(dhcp);
 261                 dhcp->driver = NULL;
 262         }
 263
 264         connman_dhcp_unref(dhcp);
 265 }
 266
 267 static void dhcp_change(struct connman_element *element)
 268 {
 269         DBG("element %p name %s", element, element->name);
 270
 271         if (element->state == CONNMAN_ELEMENT_STATE_ERROR)
 272                 connman_element_set_error(element->parent,
 273                                         CONNMAN_ELEMENT_ERROR_DHCP_FAILED);
 274 }
 275
 276 static struct connman_driver dhcp_driver = {
 277         .name           = "dhcp",
 278         .type           = CONNMAN_ELEMENT_TYPE_DHCP,
 279         .priority       = CONNMAN_DRIVER_PRIORITY_LOW,
 280         .probe          = dhcp_probe,
 281         .remove         = dhcp_remove,
 282         .change         = dhcp_change,
 283 };
 284
 285 int __connman_dhcp_init(void)
 286 {
 287         return connman_driver_register(&dhcp_driver);
 288 }
 289
 290 void __connman_dhcp_cleanup(void)
 291 {
 292         connman_driver_unregister(&dhcp_driver);
 293 }