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 #include <stdio.h>
  26 #include <errno.h>
  27 #include <string.h>
  28 #include <stdlib.h>
  29
  30 #include <connman/ipconfig.h>
  31
  32 #include <gdhcp/gdhcp.h>
  33
  34 #include <glib.h>
  35
  36 #include "connman.h"
  37
  38 struct connman_dhcp {
  39         struct connman_network *network;
  40         dhcp_cb callback;
  41
  42         char **nameservers;
  43         char *timeserver;
  44         char *pac;
  45
  46         GDHCPClient *dhcp_client;
  47 };
  48
  49 static GHashTable *network_table;
  50
  51 static void dhcp_free(struct connman_dhcp *dhcp)
  52 {
  53         g_strfreev(dhcp->nameservers);
  54         g_free(dhcp->timeserver);
  55         g_free(dhcp->pac);
  56
  57         dhcp->nameservers = NULL;
  58         dhcp->timeserver = NULL;
  59         dhcp->pac = NULL;
  60 }
  61
  62 /**
  63  * dhcp_invalidate: Invalidate an existing DHCP lease
  64  * @dhcp: pointer to the DHCP lease to invalidate.
  65  * @callback: flag indicating whether or not to invoke the client callback
  66  *            if present.
  67  *
  68  * Invalidates an existing DHCP lease, optionally invoking the client
  69  * callback. The caller may wish to avoid the client callback invocation
  70  * when the invocation of that callback might otherwise unnecessarily upset
  71  * service state due to the IP configuration change implied by this
  72  * invalidation.
  73  */
  74 static void dhcp_invalidate(struct connman_dhcp *dhcp, connman_bool_t callback)
  75 {
  76         struct connman_service *service;
  77         struct connman_ipconfig *ipconfig;
  78         int i;
  79
  80         DBG("dhcp %p callback %u", dhcp, callback);
  81
  82         if (dhcp == NULL)
  83                 return;
  84
  85         service = __connman_service_lookup_from_network(dhcp->network);
  86         if (service == NULL)
  87                 goto out;
  88
  89         ipconfig = __connman_service_get_ip4config(service);
  90         if (ipconfig == NULL)
  91                 goto out;
  92
  93         __connman_6to4_remove(ipconfig);
  94
  95         __connman_service_set_domainname(service, NULL);
  96         __connman_service_set_pac(service, NULL);
  97         __connman_service_timeserver_remove(service, dhcp->timeserver);
  98
  99         if (dhcp->nameservers != NULL) {
 100                 for (i = 0; dhcp->nameservers[i] != NULL; i++) {
 101                         __connman_service_nameserver_remove(service,
 102                                                         dhcp->nameservers[i]);
 103                 }
 104         }
 105
 106         __connman_ipconfig_address_remove(ipconfig);
 107
 108         __connman_ipconfig_set_local(ipconfig, NULL);
 109         __connman_ipconfig_set_broadcast(ipconfig, NULL);
 110         __connman_ipconfig_set_gateway(ipconfig, NULL);
 111         __connman_ipconfig_set_prefixlen(ipconfig, 0);
 112
 113         if (dhcp->callback != NULL && callback)
 114                 dhcp->callback(dhcp->network, FALSE);
 115
 116 out:
 117         dhcp_free(dhcp);
 118 }
 119
 120 static void dhcp_valid(struct connman_dhcp *dhcp)
 121 {
 122         if (dhcp->callback != NULL)
 123                 dhcp->callback(dhcp->network, TRUE);
 124 }
 125
 126 static void no_lease_cb(GDHCPClient *dhcp_client, gpointer user_data)
 127 {
 128         struct connman_dhcp *dhcp = user_data;
 129
 130         DBG("No lease available");
 131
 132         dhcp_invalidate(dhcp, TRUE);
 133 }
 134
 135 static void lease_lost_cb(GDHCPClient *dhcp_client, gpointer user_data)
 136 {
 137         struct connman_dhcp *dhcp = user_data;
 138
 139         DBG("Lease lost");
 140
 141         dhcp_invalidate(dhcp, TRUE);
 142 }
 143
 144 static void ipv4ll_lost_cb(GDHCPClient *dhcp_client, gpointer user_data)
 145 {
 146         struct connman_dhcp *dhcp = user_data;
 147
 148         DBG("Lease lost");
 149
 150         dhcp_invalidate(dhcp, TRUE);
 151 }
 152
 153
 154 static gboolean compare_string_arrays(char **array_a, char **array_b)
 155 {
 156         int i;
 157
 158         if (array_a == NULL || array_b == NULL)
 159                 return FALSE;
 160
 161         if (g_strv_length(array_a) != g_strv_length(array_b))
 162                 return FALSE;
 163
 164         for (i = 0; array_a[i] != NULL &&
 165                              array_b[i] != NULL; i++) {
 166                 if (g_strcmp0(array_a[i], array_b[i]) != 0)
 167                         return FALSE;
 168         }
 169
 170         return TRUE;
 171 }
 172
 173 static void lease_available_cb(GDHCPClient *dhcp_client, gpointer user_data)
 174 {
 175         struct connman_dhcp *dhcp = user_data;
 176         GList *list, *option = NULL;
 177         char *address, *netmask = NULL, *gateway = NULL;
 178         const char *c_address, *c_gateway;
 179         char *domainname = NULL, *hostname = NULL;
 180         char **nameservers, *timeserver = NULL, *pac = NULL;
 181         int ns_entries;
 182         struct connman_ipconfig *ipconfig;
 183         struct connman_service *service;
 184         unsigned char prefixlen, c_prefixlen;
 185         gboolean ip_change;
 186         int i;
 187
 188         DBG("Lease available");
 189
 190         service = __connman_service_lookup_from_network(dhcp->network);
 191         if (service == NULL) {
 192                 connman_error("Can not lookup service");
 193                 return;
 194         }
 195
 196         ipconfig = __connman_service_get_ip4config(service);
 197         if (ipconfig == NULL) {
 198                 connman_error("Could not lookup ipconfig");
 199                 return;
 200         }
 201
 202         c_address = __connman_ipconfig_get_local(ipconfig);
 203         c_gateway = __connman_ipconfig_get_gateway(ipconfig);
 204         c_prefixlen = __connman_ipconfig_get_prefixlen(ipconfig);
 205
 206         address = g_dhcp_client_get_address(dhcp_client);
 207
 208         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_SUBNET);
 209         if (option != NULL)
 210                 netmask = g_strdup(option->data);
 211
 212         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_ROUTER);
 213         if (option != NULL)
 214                 gateway = g_strdup(option->data);
 215
 216         prefixlen = __connman_ipconfig_netmask_prefix_len(netmask);
 217
 218         DBG("c_address %s", c_address);
 219
 220         if (address != NULL && c_address != NULL &&
 221                                         g_strcmp0(address, c_address) != 0)
 222                 ip_change = TRUE;
 223         else if (gateway != NULL && c_gateway != NULL &&
 224                                         g_strcmp0(gateway, c_gateway) != 0)
 225                 ip_change = TRUE;
 226         else if (prefixlen != c_prefixlen)
 227                 ip_change = TRUE;
 228         else if (c_address == NULL || c_gateway == NULL)
 229                 ip_change = TRUE;
 230         else
 231                 ip_change = FALSE;
 232
 233         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_DNS_SERVER);
 234         for (ns_entries = 0, list = option; list; list = list->next)
 235                 ns_entries += 1;
 236         nameservers = g_try_new0(char *, ns_entries + 1);
 237         if (nameservers != NULL) {
 238                 for (i = 0, list = option; list; list = list->next, i++)
 239                         nameservers[i] = g_strdup(list->data);
 240                 nameservers[ns_entries] = NULL;
 241         }
 242
 243         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_DOMAIN_NAME);
 244         if (option != NULL)
 245                 domainname = g_strdup(option->data);
 246
 247         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_HOST_NAME);
 248         if (option != NULL)
 249                 hostname = g_strdup(option->data);
 250
 251         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_NTP_SERVER);
 252         if (option != NULL)
 253                 timeserver = g_strdup(option->data);
 254
 255         option = g_dhcp_client_get_option(dhcp_client, 252);
 256         if (option != NULL)
 257                 pac = g_strdup(option->data);
 258
 259         connman_ipconfig_set_method(ipconfig, CONNMAN_IPCONFIG_METHOD_DHCP);
 260
 261         if (ip_change == TRUE) {
 262                 __connman_ipconfig_set_local(ipconfig, address);
 263                 __connman_ipconfig_set_prefixlen(ipconfig, prefixlen);
 264                 __connman_ipconfig_set_gateway(ipconfig, gateway);
 265         }
 266
 267         if (compare_string_arrays(nameservers, dhcp->nameservers) == FALSE) {
 268                 if (dhcp->nameservers != NULL) {
 269                         for (i = 0; dhcp->nameservers[i] != NULL; i++) {
 270                                 __connman_service_nameserver_remove(service,
 271                                                         dhcp->nameservers[i]);
 272                         }
 273                         g_strfreev(dhcp->nameservers);
 274                 }
 275
 276                 dhcp->nameservers = nameservers;
 277
 278                 for (i = 0; dhcp->nameservers[i] != NULL; i++) {
 279                         __connman_service_nameserver_append(service,
 280                                                         dhcp->nameservers[i]);
 281                 }
 282         } else {
 283                 g_strfreev(nameservers);
 284         }
 285
 286         if (g_strcmp0(timeserver, dhcp->timeserver) != 0) {
 287                 if (dhcp->timeserver != NULL) {
 288                         __connman_service_timeserver_remove(service,
 289                                                         dhcp->timeserver);
 290                         g_free(dhcp->timeserver);
 291                 }
 292
 293                 dhcp->timeserver = timeserver;
 294
 295                 if (dhcp->timeserver != NULL)
 296                         __connman_service_timeserver_append(service,
 297                                                         dhcp->timeserver);
 298         }
 299
 300         if (g_strcmp0(pac, dhcp->pac) != 0) {
 301                 g_free(dhcp->pac);
 302                 dhcp->pac = pac;
 303
 304                 __connman_service_set_pac(service, dhcp->pac);
 305         }
 306
 307         __connman_service_set_domainname(service, domainname);
 308
 309         if (domainname != NULL)
 310                 __connman_utsname_set_domainname(domainname);
 311
 312         if (hostname != NULL)
 313                 __connman_utsname_set_hostname(hostname);
 314
 315         if (ip_change == TRUE)
 316                 dhcp_valid(dhcp);
 317
 318         __connman_6to4_probe(service);
 319
 320         g_free(address);
 321         g_free(netmask);
 322         g_free(gateway);
 323         g_free(domainname);
 324         g_free(hostname);
 325 }
 326
 327 static void ipv4ll_available_cb(GDHCPClient *dhcp_client, gpointer user_data)
 328 {
 329         struct connman_dhcp *dhcp = user_data;
 330         char *address, *netmask;
 331         struct connman_service *service;
 332         struct connman_ipconfig *ipconfig;
 333         unsigned char prefixlen;
 334
 335         DBG("IPV4LL available");
 336
 337         service = __connman_service_lookup_from_network(dhcp->network);
 338         if (service == NULL)
 339                 return;
 340
 341         ipconfig = __connman_service_get_ip4config(service);
 342         if (ipconfig == NULL)
 343                 return;
 344
 345         address = g_dhcp_client_get_address(dhcp_client);
 346         netmask = g_dhcp_client_get_netmask(dhcp_client);
 347
 348         prefixlen = __connman_ipconfig_netmask_prefix_len(netmask);
 349
 350         connman_ipconfig_set_method(ipconfig, CONNMAN_IPCONFIG_METHOD_DHCP);
 351         __connman_ipconfig_set_local(ipconfig, address);
 352         __connman_ipconfig_set_prefixlen(ipconfig, prefixlen);
 353         __connman_ipconfig_set_gateway(ipconfig, NULL);
 354
 355         dhcp_valid(dhcp);
 356
 357         g_free(address);
 358         g_free(netmask);
 359 }
 360
 361 static void dhcp_debug(const char *str, void *data)
 362 {
 363         connman_info("%s: %s\n", (const char *) data, str);
 364 }
 365
 366 static int dhcp_request(struct connman_dhcp *dhcp)
 367 {
 368         GDHCPClient *dhcp_client;
 369         GDHCPClientError error;
 370         const char *hostname;
 371         int index;
 372
 373         DBG("dhcp %p", dhcp);
 374
 375         index = connman_network_get_index(dhcp->network);
 376
 377         dhcp_client = g_dhcp_client_new(G_DHCP_IPV4, index, &error);
 378         if (error != G_DHCP_CLIENT_ERROR_NONE)
 379                 return -EINVAL;
 380
 381         if (getenv("CONNMAN_DHCP_DEBUG"))
 382                 g_dhcp_client_set_debug(dhcp_client, dhcp_debug, "DHCP");
 383
 384         hostname = connman_utsname_get_hostname();
 385         if (hostname != NULL)
 386                 g_dhcp_client_set_send(dhcp_client, G_DHCP_HOST_NAME, hostname);
 387
 388         g_dhcp_client_set_request(dhcp_client, G_DHCP_HOST_NAME);
 389         g_dhcp_client_set_request(dhcp_client, G_DHCP_SUBNET);
 390         g_dhcp_client_set_request(dhcp_client, G_DHCP_DNS_SERVER);
 391         g_dhcp_client_set_request(dhcp_client, G_DHCP_DOMAIN_NAME);
 392         g_dhcp_client_set_request(dhcp_client, G_DHCP_NTP_SERVER);
 393         g_dhcp_client_set_request(dhcp_client, G_DHCP_ROUTER);
 394         g_dhcp_client_set_request(dhcp_client, 252);
 395
 396         g_dhcp_client_register_event(dhcp_client,
 397                         G_DHCP_CLIENT_EVENT_LEASE_AVAILABLE,
 398                                                 lease_available_cb, dhcp);
 399
 400         g_dhcp_client_register_event(dhcp_client,
 401                         G_DHCP_CLIENT_EVENT_IPV4LL_AVAILABLE,
 402                                                 ipv4ll_available_cb, dhcp);
 403
 404         g_dhcp_client_register_event(dhcp_client,
 405                         G_DHCP_CLIENT_EVENT_LEASE_LOST, lease_lost_cb, dhcp);
 406
 407         g_dhcp_client_register_event(dhcp_client,
 408                         G_DHCP_CLIENT_EVENT_IPV4LL_LOST, ipv4ll_lost_cb, dhcp);
 409
 410         g_dhcp_client_register_event(dhcp_client,
 411                         G_DHCP_CLIENT_EVENT_NO_LEASE, no_lease_cb, dhcp);
 412
 413         dhcp->dhcp_client = dhcp_client;
 414
 415         return g_dhcp_client_start(dhcp_client);
 416 }
 417
 418 static int dhcp_release(struct connman_dhcp *dhcp)
 419 {
 420         DBG("dhcp %p", dhcp);
 421
 422         if (dhcp->dhcp_client == NULL)
 423                 return 0;
 424
 425         g_dhcp_client_stop(dhcp->dhcp_client);
 426         g_dhcp_client_unref(dhcp->dhcp_client);
 427
 428         dhcp->dhcp_client = NULL;
 429
 430         return 0;
 431 }
 432
 433 static void remove_network(gpointer user_data)
 434 {
 435         struct connman_dhcp *dhcp = user_data;
 436
 437         DBG("dhcp %p", dhcp);
 438
 439         dhcp_invalidate(dhcp, FALSE);
 440         dhcp_release(dhcp);
 441
 442         g_free(dhcp);
 443 }
 444
 445 int __connman_dhcp_start(struct connman_network *network, dhcp_cb callback)
 446 {
 447         struct connman_dhcp *dhcp;
 448
 449         DBG("");
 450
 451         dhcp = g_try_new0(struct connman_dhcp, 1);
 452         if (dhcp == NULL)
 453                 return -ENOMEM;
 454
 455         dhcp->network = network;
 456         dhcp->callback = callback;
 457
 458         g_hash_table_replace(network_table, network, dhcp);
 459
 460         return dhcp_request(dhcp);
 461 }
 462
 463 void __connman_dhcp_stop(struct connman_network *network)
 464 {
 465         DBG("");
 466
 467         if (network_table == NULL)
 468                 return;
 469
 470         g_hash_table_remove(network_table, network);
 471 }
 472
 473 int __connman_dhcp_init(void)
 474 {
 475         DBG("");
 476
 477         network_table = g_hash_table_new_full(g_direct_hash, g_direct_equal,
 478                                                         NULL, remove_network);
 479
 480         return 0;
 481 }
 482
 483 void __connman_dhcp_cleanup(void)
 484 {
 485         DBG("");
 486
 487         g_hash_table_destroy(network_table);
 488         network_table = NULL;
 489 }