gdhcp/client.c

   1 /*
   2  *
   3  *  DHCP client library with GLib integration
   4  *
   5  *  Copyright (C) 2009-2014  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 #define _GNU_SOURCE
  27 #include <stdio.h>
  28 #include <errno.h>
  29 #include <unistd.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32 #include <sys/ioctl.h>
  33 #include <arpa/inet.h>
  34 #include <sys/time.h>
  35 #include <resolv.h>
  36
  37 #include <netpacket/packet.h>
  38 #include <netinet/if_ether.h>
  39 #include <net/ethernet.h>
  40
  41 #include <linux/if.h>
  42 #include <linux/filter.h>
  43
  44 #include <glib.h>
  45
  46 #include "gdhcp.h"
  47 #include "common.h"
  48 #include "ipv4ll.h"
  49
  50 #define DISCOVER_TIMEOUT 5
  51 #define DISCOVER_RETRIES 6
  52
  53 #define REQUEST_TIMEOUT 5
  54 #define REQUEST_RETRIES 3
  55
  56 typedef enum _listen_mode {
  57         L_NONE,
  58         L2,
  59         L3,
  60         L_ARP,
  61 } ListenMode;
  62
  63 typedef enum _dhcp_client_state {
  64         INIT_SELECTING,
  65         REBOOTING,
  66         REQUESTING,
  67         BOUND,
  68         RENEWING,
  69         REBINDING,
  70         RELEASED,
  71         IPV4LL_PROBE,
  72         IPV4LL_ANNOUNCE,
  73         IPV4LL_MONITOR,
  74         IPV4LL_DEFEND,
  75         INFORMATION_REQ,
  76         SOLICITATION,
  77         REQUEST,
  78         CONFIRM,
  79         RENEW,
  80         REBIND,
  81         RELEASE,
  82         DECLINE,
  83 } ClientState;
  84
  85 struct _GDHCPClient {
  86         int ref_count;
  87         GDHCPType type;
  88         ClientState state;
  89         int ifindex;
  90         char *interface;
  91         uint8_t mac_address[6];
  92         uint32_t xid;
  93         uint32_t server_ip;
  94         uint32_t requested_ip;
  95         char *assigned_ip;
  96         time_t start;
  97         uint32_t lease_seconds;
  98         ListenMode listen_mode;
  99         int listener_sockfd;
 100         uint8_t retry_times;
 101         uint8_t ack_retry_times;
 102         uint8_t conflicts;
 103         guint timeout;
 104         guint t1_timeout;
 105         guint t2_timeout;
 106         guint lease_timeout;
 107         guint listener_watch;
 108         GList *require_list;
 109         GList *request_list;
 110         GHashTable *code_value_hash;
 111         GHashTable *send_value_hash;
 112         GDHCPClientEventFunc lease_available_cb;
 113         gpointer lease_available_data;
 114         GDHCPClientEventFunc ipv4ll_available_cb;
 115         gpointer ipv4ll_available_data;
 116         GDHCPClientEventFunc no_lease_cb;
 117         gpointer no_lease_data;
 118         GDHCPClientEventFunc lease_lost_cb;
 119         gpointer lease_lost_data;
 120         GDHCPClientEventFunc ipv4ll_lost_cb;
 121         gpointer ipv4ll_lost_data;
 122         GDHCPClientEventFunc address_conflict_cb;
 123         gpointer address_conflict_data;
 124         GDHCPDebugFunc debug_func;
 125         gpointer debug_data;
 126         GDHCPClientEventFunc information_req_cb;
 127         gpointer information_req_data;
 128         GDHCPClientEventFunc solicitation_cb;
 129         gpointer solicitation_data;
 130         GDHCPClientEventFunc advertise_cb;
 131         gpointer advertise_data;
 132         GDHCPClientEventFunc request_cb;
 133         gpointer request_data;
 134         GDHCPClientEventFunc renew_cb;
 135         gpointer renew_data;
 136         GDHCPClientEventFunc rebind_cb;
 137         gpointer rebind_data;
 138         GDHCPClientEventFunc release_cb;
 139         gpointer release_data;
 140         GDHCPClientEventFunc confirm_cb;
 141         gpointer confirm_data;
 142         GDHCPClientEventFunc decline_cb;
 143         gpointer decline_data;
 144         char *last_address;
 145         unsigned char *duid;
 146         int duid_len;
 147         unsigned char *server_duid;
 148         int server_duid_len;
 149         uint16_t status_code;
 150         uint32_t iaid;
 151         uint32_t T1, T2;
 152         struct in6_addr ia_na;
 153         struct in6_addr ia_ta;
 154         time_t last_request;
 155         uint32_t expire;
 156         bool retransmit;
 157         struct timeval start_time;
 158         bool request_bcast;
 159 };
 160
 161 static inline void debug(GDHCPClient *client, const char *format, ...)
 162 {
 163         char str[256];
 164         va_list ap;
 165
 166         if (!client->debug_func)
 167                 return;
 168
 169         va_start(ap, format);
 170
 171         if (vsnprintf(str, sizeof(str), format, ap) > 0)
 172                 client->debug_func(str, client->debug_data);
 173
 174         va_end(ap);
 175 }
 176
 177 /* Initialize the packet with the proper defaults */
 178 static void init_packet(GDHCPClient *dhcp_client, gpointer pkt, char type)
 179 {
 180         if (dhcp_client->type == G_DHCP_IPV6)
 181                 dhcpv6_init_header(pkt, type);
 182         else {
 183                 struct dhcp_packet *packet = pkt;
 184
 185                 dhcp_init_header(packet, type);
 186                 memcpy(packet->chaddr, dhcp_client->mac_address, 6);
 187         }
 188 }
 189
 190 static void add_request_options(GDHCPClient *dhcp_client,
 191                                 struct dhcp_packet *packet)
 192 {
 193         int len = 0;
 194         GList *list;
 195         uint8_t code;
 196         int end = dhcp_end_option(packet->options);
 197
 198         for (list = dhcp_client->request_list; list; list = list->next) {
 199                 code = (uint8_t) GPOINTER_TO_INT(list->data);
 200
 201                 packet->options[end + OPT_DATA + len] = code;
 202                 len++;
 203         }
 204
 205         if (len) {
 206                 packet->options[end + OPT_CODE] = DHCP_PARAM_REQ;
 207                 packet->options[end + OPT_LEN] = len;
 208                 packet->options[end + OPT_DATA + len] = DHCP_END;
 209         }
 210 }
 211
 212 struct hash_params {
 213         unsigned char *buf;
 214         int max_buf;
 215         unsigned char **ptr_buf;
 216 };
 217
 218 static void add_dhcpv6_binary_option(gpointer key, gpointer value,
 219                                         gpointer user_data)
 220 {
 221         uint8_t *option = value;
 222         uint16_t len;
 223         struct hash_params *params = user_data;
 224
 225         /* option[0][1] contains option code */
 226         len = option[2] << 8 | option[3];
 227
 228         if ((*params->ptr_buf + len + 2 + 2) > (params->buf + params->max_buf))
 229                 return;
 230
 231         memcpy(*params->ptr_buf, option, len + 2 + 2);
 232         (*params->ptr_buf) += len + 2 + 2;
 233 }
 234
 235 static void add_dhcpv6_send_options(GDHCPClient *dhcp_client,
 236                                 unsigned char *buf, int max_buf,
 237                                 unsigned char **ptr_buf)
 238 {
 239         struct hash_params params = {
 240                 .buf = buf,
 241                 .max_buf = max_buf,
 242                 .ptr_buf = ptr_buf
 243         };
 244
 245         if (dhcp_client->type != G_DHCP_IPV6)
 246                 return;
 247
 248         g_hash_table_foreach(dhcp_client->send_value_hash,
 249                                 add_dhcpv6_binary_option, &params);
 250
 251         *ptr_buf = *params.ptr_buf;
 252 }
 253
 254 static void copy_option(uint8_t *buf, uint16_t code, uint16_t len,
 255                         uint8_t *msg)
 256 {
 257         buf[0] = code >> 8;
 258         buf[1] = code & 0xff;
 259         buf[2] = len >> 8;
 260         buf[3] = len & 0xff;
 261         if (len > 0 && msg)
 262                 memcpy(&buf[4], msg, len);
 263 }
 264
 265 static int32_t get_time_diff(struct timeval *tv)
 266 {
 267         struct timeval now;
 268         int32_t hsec;
 269
 270         gettimeofday(&now, NULL);
 271
 272         hsec = (now.tv_sec - tv->tv_sec) * 100;
 273         hsec += (now.tv_usec - tv->tv_usec) / 10000;
 274
 275         return hsec;
 276 }
 277
 278 static void remove_timeouts(GDHCPClient *dhcp_client)
 279 {
 280
 281         if (dhcp_client->timeout > 0)
 282                 g_source_remove(dhcp_client->timeout);
 283         if (dhcp_client->t1_timeout > 0)
 284                 g_source_remove(dhcp_client->t1_timeout);
 285         if (dhcp_client->t2_timeout > 0)
 286                 g_source_remove(dhcp_client->t2_timeout);
 287         if (dhcp_client->lease_timeout > 0)
 288                 g_source_remove(dhcp_client->lease_timeout);
 289
 290         dhcp_client->timeout = 0;
 291         dhcp_client->t1_timeout = 0;
 292         dhcp_client->t2_timeout = 0;
 293         dhcp_client->lease_timeout = 0;
 294
 295 }
 296
 297 static void add_dhcpv6_request_options(GDHCPClient *dhcp_client,
 298                                 struct dhcpv6_packet *packet,
 299                                 unsigned char *buf, int max_buf,
 300                                 unsigned char **ptr_buf)
 301 {
 302         GList *list;
 303         uint16_t code, value;
 304         bool added;
 305         int32_t diff;
 306         int len;
 307
 308         if (dhcp_client->type != G_DHCP_IPV6)
 309                 return;
 310
 311         for (list = dhcp_client->request_list; list; list = list->next) {
 312                 code = (uint16_t) GPOINTER_TO_INT(list->data);
 313                 added = false;
 314
 315                 switch (code) {
 316                 case G_DHCPV6_CLIENTID:
 317                         if (!dhcp_client->duid)
 318                                 return;
 319
 320                         len = 2 + 2 + dhcp_client->duid_len;
 321                         if ((*ptr_buf + len) > (buf + max_buf)) {
 322                                 debug(dhcp_client, "Too long dhcpv6 message "
 323                                         "when writing client id option");
 324                                 return;
 325                         }
 326
 327                         copy_option(*ptr_buf, G_DHCPV6_CLIENTID,
 328                                 dhcp_client->duid_len, dhcp_client->duid);
 329                         (*ptr_buf) += len;
 330                         added = true;
 331                         break;
 332
 333                 case G_DHCPV6_SERVERID:
 334                         if (!dhcp_client->server_duid)
 335                                 break;
 336
 337                         len = 2 + 2 + dhcp_client->server_duid_len;
 338                         if ((*ptr_buf + len) > (buf + max_buf)) {
 339                                 debug(dhcp_client, "Too long dhcpv6 message "
 340                                         "when writing server id option");
 341                                 return;
 342                         }
 343
 344                         copy_option(*ptr_buf, G_DHCPV6_SERVERID,
 345                                 dhcp_client->server_duid_len,
 346                                 dhcp_client->server_duid);
 347                         (*ptr_buf) += len;
 348                         added = true;
 349                         break;
 350
 351                 case G_DHCPV6_RAPID_COMMIT:
 352                         len = 2 + 2;
 353                         if ((*ptr_buf + len) > (buf + max_buf)) {
 354                                 debug(dhcp_client, "Too long dhcpv6 message "
 355                                         "when writing rapid commit option");
 356                                 return;
 357                         }
 358
 359                         copy_option(*ptr_buf, G_DHCPV6_RAPID_COMMIT, 0, 0);
 360                         (*ptr_buf) += len;
 361                         added = true;
 362                         break;
 363
 364                 case G_DHCPV6_ORO:
 365                         break;
 366
 367                 case G_DHCPV6_ELAPSED_TIME:
 368                         if (!dhcp_client->retransmit) {
 369                                 /*
 370                                  * Initial message, elapsed time is 0.
 371                                  */
 372                                 diff = 0;
 373                         } else {
 374                                 diff = get_time_diff(&dhcp_client->start_time);
 375                                 if (diff < 0 || diff > 0xffff)
 376                                         diff = 0xffff;
 377                         }
 378
 379                         len = 2 + 2 + 2;
 380                         if ((*ptr_buf + len) > (buf + max_buf)) {
 381                                 debug(dhcp_client, "Too long dhcpv6 message "
 382                                         "when writing elapsed time option");
 383                                 return;
 384                         }
 385
 386                         value = htons((uint16_t)diff);
 387                         copy_option(*ptr_buf, G_DHCPV6_ELAPSED_TIME,
 388                                 2, (uint8_t *)&value);
 389                         (*ptr_buf) += len;
 390                         added = true;
 391                         break;
 392
 393                 case G_DHCPV6_DNS_SERVERS:
 394                         break;
 395
 396                 case G_DHCPV6_DOMAIN_LIST:
 397                         break;
 398
 399                 case G_DHCPV6_SNTP_SERVERS:
 400                         break;
 401
 402                 default:
 403                         break;
 404                 }
 405
 406                 if (added)
 407                         debug(dhcp_client, "option %d len %d added", code, len);
 408         }
 409 }
 410
 411 static void add_binary_option(gpointer key, gpointer value, gpointer user_data)
 412 {
 413         uint8_t *option = value;
 414         struct dhcp_packet *packet = user_data;
 415
 416         dhcp_add_binary_option(packet, option);
 417 }
 418
 419 static void add_send_options(GDHCPClient *dhcp_client,
 420                                 struct dhcp_packet *packet)
 421 {
 422         g_hash_table_foreach(dhcp_client->send_value_hash,
 423                                 add_binary_option, packet);
 424 }
 425
 426 /*
 427  * Return an RFC 951- and 2131-complaint BOOTP 'secs' value that
 428  * represents the number of seconds elapsed from the start of
 429  * attempting DHCP to satisfy some DHCP servers that allow for an
 430  * "authoritative" reply before responding.
 431  */
 432 static uint16_t dhcp_attempt_secs(GDHCPClient *dhcp_client)
 433 {
 434         return htons(MIN(time(NULL) - dhcp_client->start, UINT16_MAX));
 435 }
 436
 437 static int send_discover(GDHCPClient *dhcp_client, uint32_t requested)
 438 {
 439         struct dhcp_packet packet;
 440
 441         debug(dhcp_client, "sending DHCP discover request");
 442
 443         init_packet(dhcp_client, &packet, DHCPDISCOVER);
 444
 445         packet.xid = dhcp_client->xid;
 446         packet.secs = dhcp_attempt_secs(dhcp_client);
 447
 448         if (requested)
 449                 dhcp_add_option_uint32(&packet, DHCP_REQUESTED_IP, requested);
 450
 451         /* Explicitly saying that we want RFC-compliant packets helps
 452          * some buggy DHCP servers to NOT send bigger packets */
 453         dhcp_add_option_uint16(&packet, DHCP_MAX_SIZE, 576);
 454
 455         add_request_options(dhcp_client, &packet);
 456
 457         add_send_options(dhcp_client, &packet);
 458
 459         /*
 460          * If we do not get a reply to DISCOVER packet, then we try with
 461          * broadcast flag set. So first packet is sent without broadcast flag,
 462          * first retry is with broadcast flag, second retry is without it etc.
 463          * Reason is various buggy routers/AP that either eat the other or vice
 464          * versa. In the receiving side we then find out what kind of packet
 465          * the server can send.
 466          */
 467         return dhcp_send_raw_packet(&packet, INADDR_ANY, CLIENT_PORT,
 468                                 INADDR_BROADCAST, SERVER_PORT,
 469                                 MAC_BCAST_ADDR, dhcp_client->ifindex,
 470                                 dhcp_client->retry_times % 2);
 471 }
 472
 473 static int send_request(GDHCPClient *dhcp_client)
 474 {
 475         struct dhcp_packet packet;
 476
 477         debug(dhcp_client, "sending DHCP request (state %d)",
 478                 dhcp_client->state);
 479
 480         init_packet(dhcp_client, &packet, DHCPREQUEST);
 481
 482         packet.xid = dhcp_client->xid;
 483         packet.secs = dhcp_attempt_secs(dhcp_client);
 484
 485         if (dhcp_client->state == REQUESTING || dhcp_client->state == REBOOTING)
 486                 dhcp_add_option_uint32(&packet, DHCP_REQUESTED_IP,
 487                                 dhcp_client->requested_ip);
 488
 489         if (dhcp_client->state == REQUESTING)
 490                 dhcp_add_option_uint32(&packet, DHCP_SERVER_ID,
 491                                 dhcp_client->server_ip);
 492
 493         dhcp_add_option_uint16(&packet, DHCP_MAX_SIZE, 576);
 494
 495         add_request_options(dhcp_client, &packet);
 496
 497         add_send_options(dhcp_client, &packet);
 498
 499         if (dhcp_client->state == RENEWING || dhcp_client->state == REBINDING)
 500                 packet.ciaddr = htonl(dhcp_client->requested_ip);
 501
 502         if (dhcp_client->state == RENEWING)
 503                 return dhcp_send_kernel_packet(&packet,
 504                                 dhcp_client->requested_ip, CLIENT_PORT,
 505                                 dhcp_client->server_ip, SERVER_PORT);
 506
 507         return dhcp_send_raw_packet(&packet, INADDR_ANY, CLIENT_PORT,
 508                                 INADDR_BROADCAST, SERVER_PORT,
 509                                 MAC_BCAST_ADDR, dhcp_client->ifindex,
 510                                 dhcp_client->request_bcast);
 511 }
 512
 513 static int send_release(GDHCPClient *dhcp_client,
 514                         uint32_t server, uint32_t ciaddr)
 515 {
 516         struct dhcp_packet packet;
 517
 518         debug(dhcp_client, "sending DHCP release request");
 519
 520         init_packet(dhcp_client, &packet, DHCPRELEASE);
 521         packet.xid = rand();
 522         packet.ciaddr = htonl(ciaddr);
 523
 524         dhcp_add_option_uint32(&packet, DHCP_SERVER_ID, server);
 525
 526         return dhcp_send_kernel_packet(&packet, ciaddr, CLIENT_PORT,
 527                                                 server, SERVER_PORT);
 528 }
 529
 530 static gboolean ipv4ll_probe_timeout(gpointer dhcp_data);
 531 static int switch_listening_mode(GDHCPClient *dhcp_client,
 532                                         ListenMode listen_mode);
 533
 534 static gboolean send_probe_packet(gpointer dhcp_data)
 535 {
 536         GDHCPClient *dhcp_client;
 537         guint timeout;
 538
 539         dhcp_client = dhcp_data;
 540         /* if requested_ip is not valid, pick a new address*/
 541         if (dhcp_client->requested_ip == 0) {
 542                 debug(dhcp_client, "pick a new random address");
 543                 dhcp_client->requested_ip = ipv4ll_random_ip(0);
 544         }
 545
 546         debug(dhcp_client, "sending IPV4LL probe request");
 547
 548         if (dhcp_client->retry_times == 1) {
 549                 dhcp_client->state = IPV4LL_PROBE;
 550                 switch_listening_mode(dhcp_client, L_ARP);
 551         }
 552         ipv4ll_send_arp_packet(dhcp_client->mac_address, 0,
 553                         dhcp_client->requested_ip, dhcp_client->ifindex);
 554
 555         if (dhcp_client->retry_times < PROBE_NUM) {
 556                 /*add a random timeout in range of PROBE_MIN to PROBE_MAX*/
 557                 timeout = ipv4ll_random_delay_ms(PROBE_MAX-PROBE_MIN);
 558                 timeout += PROBE_MIN*1000;
 559         } else
 560                 timeout = (ANNOUNCE_WAIT * 1000);
 561
 562         dhcp_client->timeout = g_timeout_add_full(G_PRIORITY_HIGH,
 563                                                  timeout,
 564                                                  ipv4ll_probe_timeout,
 565                                                  dhcp_client,
 566                                                  NULL);
 567         return FALSE;
 568 }
 569
 570 static gboolean ipv4ll_announce_timeout(gpointer dhcp_data);
 571 static gboolean ipv4ll_defend_timeout(gpointer dhcp_data);
 572
 573 static gboolean send_announce_packet(gpointer dhcp_data)
 574 {
 575         GDHCPClient *dhcp_client;
 576
 577         dhcp_client = dhcp_data;
 578
 579         debug(dhcp_client, "sending IPV4LL announce request");
 580
 581         ipv4ll_send_arp_packet(dhcp_client->mac_address,
 582                                 dhcp_client->requested_ip,
 583                                 dhcp_client->requested_ip,
 584                                 dhcp_client->ifindex);
 585
 586         remove_timeouts(dhcp_client);
 587
 588         if (dhcp_client->state == IPV4LL_DEFEND) {
 589                 dhcp_client->timeout =
 590                         g_timeout_add_seconds_full(G_PRIORITY_HIGH,
 591                                                 DEFEND_INTERVAL,
 592                                                 ipv4ll_defend_timeout,
 593                                                 dhcp_client,
 594                                                 NULL);
 595                 return TRUE;
 596         } else
 597                 dhcp_client->timeout =
 598                         g_timeout_add_seconds_full(G_PRIORITY_HIGH,
 599                                                 ANNOUNCE_INTERVAL,
 600                                                 ipv4ll_announce_timeout,
 601                                                 dhcp_client,
 602                                                 NULL);
 603         return TRUE;
 604 }
 605
 606 static void get_interface_mac_address(int index, uint8_t *mac_address)
 607 {
 608         struct ifreq ifr;
 609         int sk, err;
 610
 611         sk = socket(PF_INET, SOCK_DGRAM | SOCK_CLOEXEC, 0);
 612         if (sk < 0) {
 613                 perror("Open socket error");
 614                 return;
 615         }
 616
 617         memset(&ifr, 0, sizeof(ifr));
 618         ifr.ifr_ifindex = index;
 619
 620         err = ioctl(sk, SIOCGIFNAME, &ifr);
 621         if (err < 0) {
 622                 perror("Get interface name error");
 623                 goto done;
 624         }
 625
 626         err = ioctl(sk, SIOCGIFHWADDR, &ifr);
 627         if (err < 0) {
 628                 perror("Get mac address error");
 629                 goto done;
 630         }
 631
 632         memcpy(mac_address, ifr.ifr_hwaddr.sa_data, 6);
 633
 634 done:
 635         close(sk);
 636 }
 637
 638 void g_dhcpv6_client_set_retransmit(GDHCPClient *dhcp_client)
 639 {
 640         if (!dhcp_client)
 641                 return;
 642
 643         dhcp_client->retransmit = true;
 644 }
 645
 646 void g_dhcpv6_client_clear_retransmit(GDHCPClient *dhcp_client)
 647 {
 648         if (!dhcp_client)
 649                 return;
 650
 651         dhcp_client->retransmit = false;
 652 }
 653
 654 int g_dhcpv6_create_duid(GDHCPDuidType duid_type, int index, int type,
 655                         unsigned char **duid, int *duid_len)
 656 {
 657         time_t duid_time;
 658
 659         switch (duid_type) {
 660         case G_DHCPV6_DUID_LLT:
 661                 *duid_len = 2 + 2 + 4 + ETH_ALEN;
 662                 *duid = g_try_malloc(*duid_len);
 663                 if (!*duid)
 664                         return -ENOMEM;
 665
 666                 (*duid)[0] = 0;
 667                 (*duid)[1] = 1;
 668                 get_interface_mac_address(index, &(*duid)[2 + 2 + 4]);
 669                 (*duid)[2] = 0;
 670                 (*duid)[3] = type;
 671                 duid_time = time(NULL) - DUID_TIME_EPOCH;
 672                 (*duid)[4] = duid_time >> 24;
 673                 (*duid)[5] = duid_time >> 16;
 674                 (*duid)[6] = duid_time >> 8;
 675                 (*duid)[7] = duid_time & 0xff;
 676                 break;
 677         case G_DHCPV6_DUID_EN:
 678                 return -EINVAL;
 679         case G_DHCPV6_DUID_LL:
 680                 *duid_len = 2 + 2 + ETH_ALEN;
 681                 *duid = g_try_malloc(*duid_len);
 682                 if (!*duid)
 683                         return -ENOMEM;
 684
 685                 (*duid)[0] = 0;
 686                 (*duid)[1] = 3;
 687                 get_interface_mac_address(index, &(*duid)[2 + 2]);
 688                 (*duid)[2] = 0;
 689                 (*duid)[3] = type;
 690                 break;
 691         }
 692
 693         return 0;
 694 }
 695
 696 static gchar *convert_to_hex(unsigned char *buf, int len)
 697 {
 698         gchar *ret = g_try_malloc(len * 2 + 1);
 699         int i;
 700
 701         for (i = 0; ret && i < len; i++)
 702                 g_snprintf(ret + i * 2, 3, "%02x", buf[i]);
 703
 704         return ret;
 705 }
 706
 707 int g_dhcpv6_client_set_duid(GDHCPClient *dhcp_client, unsigned char *duid,
 708                         int duid_len)
 709 {
 710         if (!dhcp_client || dhcp_client->type != G_DHCP_IPV6)
 711                 return -EINVAL;
 712
 713         g_free(dhcp_client->duid);
 714
 715         dhcp_client->duid = duid;
 716         dhcp_client->duid_len = duid_len;
 717
 718         if (dhcp_client->debug_func) {
 719                 gchar *hex = convert_to_hex(duid, duid_len);
 720                 debug(dhcp_client, "DUID(%d) %s", duid_len, hex);
 721                 g_free(hex);
 722         }
 723
 724         return 0;
 725 }
 726
 727 int g_dhcpv6_client_set_pd(GDHCPClient *dhcp_client, uint32_t *T1,
 728                         uint32_t *T2, GSList *prefixes)
 729 {
 730         uint8_t options[1452];
 731         unsigned int max_buf = sizeof(options);
 732         int len, count = g_slist_length(prefixes);
 733
 734         if (!dhcp_client || dhcp_client->type != G_DHCP_IPV6)
 735                 return -EINVAL;
 736
 737         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_IA_PD);
 738
 739         memset(options, 0, sizeof(options));
 740
 741         options[0] = dhcp_client->iaid >> 24;
 742         options[1] = dhcp_client->iaid >> 16;
 743         options[2] = dhcp_client->iaid >> 8;
 744         options[3] = dhcp_client->iaid;
 745
 746         if (T1) {
 747                 uint32_t t = htonl(*T1);
 748                 memcpy(&options[4], &t, 4);
 749         }
 750
 751         if (T2) {
 752                 uint32_t t = htonl(*T2);
 753                 memcpy(&options[8], &t, 4);
 754         }
 755
 756         len = 12;
 757
 758         if (count > 0) {
 759                 GSList *list;
 760
 761                 for (list = prefixes; list; list = list->next) {
 762                         GDHCPIAPrefix *prefix = list->data;
 763                         uint8_t sub_option[4+4+1+16];
 764
 765                         if ((len + 2 + 2 + sizeof(sub_option)) >= max_buf) {
 766                                 debug(dhcp_client,
 767                                         "Too long dhcpv6 message "
 768                                         "when writing IA prefix option");
 769                                 return -EINVAL;
 770                         }
 771
 772                         memset(&sub_option, 0, sizeof(sub_option));
 773
 774                         /* preferred and validity time are left zero */
 775
 776                         sub_option[8] = prefix->prefixlen;
 777                         memcpy(&sub_option[9], &prefix->prefix, 16);
 778
 779                         copy_option(&options[len], G_DHCPV6_IA_PREFIX,
 780                                 sizeof(sub_option), sub_option);
 781                         len += 2 + 2 + sizeof(sub_option);
 782                 }
 783         }
 784
 785         g_dhcpv6_client_set_send(dhcp_client, G_DHCPV6_IA_PD,
 786                                 options, len);
 787
 788         return 0;
 789 }
 790
 791 uint32_t g_dhcpv6_client_get_iaid(GDHCPClient *dhcp_client)
 792 {
 793         if (!dhcp_client || dhcp_client->type != G_DHCP_IPV6)
 794                 return 0;
 795
 796         return dhcp_client->iaid;
 797 }
 798
 799 void g_dhcpv6_client_set_iaid(GDHCPClient *dhcp_client, uint32_t iaid)
 800 {
 801         if (!dhcp_client || dhcp_client->type != G_DHCP_IPV6)
 802                 return;
 803
 804         dhcp_client->iaid = iaid;
 805 }
 806
 807 void g_dhcpv6_client_create_iaid(GDHCPClient *dhcp_client, int index,
 808                                 unsigned char *iaid)
 809 {
 810         uint8_t buf[6];
 811
 812         get_interface_mac_address(index, buf);
 813
 814         memcpy(iaid, &buf[2], 4);
 815         dhcp_client->iaid = iaid[0] << 24 |
 816                         iaid[1] << 16 | iaid[2] << 8 | iaid[3];
 817 }
 818
 819 int g_dhcpv6_client_get_timeouts(GDHCPClient *dhcp_client,
 820                                 uint32_t *T1, uint32_t *T2,
 821                                 time_t *started,
 822                                 time_t *expire)
 823 {
 824         if (!dhcp_client || dhcp_client->type != G_DHCP_IPV6)
 825                 return -EINVAL;
 826
 827         if (T1)
 828                 *T1 = dhcp_client->T1;
 829
 830         if (T2)
 831                 *T2 = dhcp_client->T2;
 832
 833         if (started)
 834                 *started = dhcp_client->last_request;
 835
 836         if (expire)
 837                 *expire = dhcp_client->last_request + dhcp_client->expire;
 838
 839         return 0;
 840 }
 841
 842 static uint8_t *create_iaaddr(GDHCPClient *dhcp_client, uint8_t *buf,
 843                                 uint16_t len)
 844 {
 845         buf[0] = 0;
 846         buf[1] = G_DHCPV6_IAADDR;
 847         buf[2] = 0;
 848         buf[3] = len;
 849         memcpy(&buf[4], &dhcp_client->ia_na, 16);
 850         memset(&buf[20], 0, 4); /* preferred */
 851         memset(&buf[24], 0, 4); /* valid */
 852         return buf;
 853 }
 854
 855 static uint8_t *append_iaaddr(GDHCPClient *dhcp_client, uint8_t *buf,
 856                         const char *address)
 857 {
 858         struct in6_addr addr;
 859
 860         if (inet_pton(AF_INET6, address, &addr) != 1)
 861                 return NULL;
 862
 863         buf[0] = 0;
 864         buf[1] = G_DHCPV6_IAADDR;
 865         buf[2] = 0;
 866         buf[3] = 24;
 867         memcpy(&buf[4], &addr, 16);
 868         memset(&buf[20], 0, 4); /* preferred */
 869         memset(&buf[24], 0, 4); /* valid */
 870         return &buf[28];
 871 }
 872
 873 static void put_iaid(GDHCPClient *dhcp_client, int index, uint8_t *buf)
 874 {
 875         uint32_t iaid;
 876
 877         iaid = g_dhcpv6_client_get_iaid(dhcp_client);
 878         if (iaid == 0) {
 879                 g_dhcpv6_client_create_iaid(dhcp_client, index, buf);
 880                 return;
 881         }
 882
 883         buf[0] = iaid >> 24;
 884         buf[1] = iaid >> 16;
 885         buf[2] = iaid >> 8;
 886         buf[3] = iaid;
 887 }
 888
 889 int g_dhcpv6_client_set_ia(GDHCPClient *dhcp_client, int index,
 890                         int code, uint32_t *T1, uint32_t *T2,
 891                         bool add_iaaddr, const char *ia_na)
 892 {
 893         if (code == G_DHCPV6_IA_TA) {
 894                 uint8_t ia_options[4];
 895
 896                 put_iaid(dhcp_client, index, ia_options);
 897
 898                 g_dhcp_client_set_request(dhcp_client, G_DHCPV6_IA_TA);
 899                 g_dhcpv6_client_set_send(dhcp_client, G_DHCPV6_IA_TA,
 900                                         ia_options, sizeof(ia_options));
 901
 902         } else if (code == G_DHCPV6_IA_NA) {
 903                 struct in6_addr addr;
 904
 905                 g_dhcp_client_set_request(dhcp_client, G_DHCPV6_IA_NA);
 906
 907                 /*
 908                  * If caller has specified the IPv6 address it wishes to
 909                  * to use (ia_na != NULL and address is valid), then send
 910                  * the address to server.
 911                  * If caller did not specify the address (ia_na == NULL) and
 912                  * if the current address is not set, then we should not send
 913                  * the address sub-option.
 914                  */
 915                 if (add_iaaddr && ((!ia_na &&
 916                         !IN6_IS_ADDR_UNSPECIFIED(&dhcp_client->ia_na))
 917                         || (ia_na &&
 918                                 inet_pton(AF_INET6, ia_na, &addr) == 1))) {
 919 #define IAADDR_LEN (16+4+4)
 920                         uint8_t ia_options[4+4+4+2+2+IAADDR_LEN];
 921
 922                         if (ia_na)
 923                                 memcpy(&dhcp_client->ia_na, &addr,
 924                                                 sizeof(struct in6_addr));
 925
 926                         put_iaid(dhcp_client, index, ia_options);
 927
 928                         if (T1) {
 929                                 ia_options[4] = *T1 >> 24;
 930                                 ia_options[5] = *T1 >> 16;
 931                                 ia_options[6] = *T1 >> 8;
 932                                 ia_options[7] = *T1;
 933                         } else
 934                                 memset(&ia_options[4], 0x00, 4);
 935
 936                         if (T2) {
 937                                 ia_options[8] = *T2 >> 24;
 938                                 ia_options[9] = *T2 >> 16;
 939                                 ia_options[10] = *T2 >> 8;
 940                                 ia_options[11] = *T2;
 941                         } else
 942                                 memset(&ia_options[8], 0x00, 4);
 943
 944                         create_iaaddr(dhcp_client, &ia_options[12],
 945                                         IAADDR_LEN);
 946
 947                         g_dhcpv6_client_set_send(dhcp_client, G_DHCPV6_IA_NA,
 948                                         ia_options, sizeof(ia_options));
 949                 } else {
 950                         uint8_t ia_options[4+4+4];
 951
 952                         put_iaid(dhcp_client, index, ia_options);
 953
 954                         memset(&ia_options[4], 0x00, 4); /* T1 (4 bytes) */
 955                         memset(&ia_options[8], 0x00, 4); /* T2 (4 bytes) */
 956
 957                         g_dhcpv6_client_set_send(dhcp_client, G_DHCPV6_IA_NA,
 958                                         ia_options, sizeof(ia_options));
 959                 }
 960
 961         } else
 962                 return -EINVAL;
 963
 964         return 0;
 965 }
 966
 967 int g_dhcpv6_client_set_ias(GDHCPClient *dhcp_client, int index,
 968                         int code, uint32_t *T1, uint32_t *T2,
 969                         GSList *addresses)
 970 {
 971         GSList *list;
 972         uint8_t *ia_options, *pos;
 973         int len, count, total_len;
 974
 975         count = g_slist_length(addresses);
 976         if (count == 0)
 977                 return -EINVAL;
 978
 979         g_dhcp_client_set_request(dhcp_client, code);
 980
 981         if (code == G_DHCPV6_IA_TA)
 982                 len = 4;         /* IAID */
 983         else if (code == G_DHCPV6_IA_NA)
 984                 len = 4 + 4 + 4; /* IAID + T1 + T2 */
 985         else
 986                 return -EINVAL;
 987
 988         total_len = len + count * (2 + 2 + 16 + 4 + 4);
 989         ia_options = g_try_malloc0(total_len);
 990         if (!ia_options)
 991                 return -ENOMEM;
 992
 993         put_iaid(dhcp_client, index, ia_options);
 994
 995         pos = &ia_options[len]; /* skip the IA_NA or IA_TA */
 996
 997         for (list = addresses; list; list = list->next) {
 998                 pos = append_iaaddr(dhcp_client, pos, list->data);
 999                 if (!pos)
1000                         break;
1001         }
1002
1003         if (code == G_DHCPV6_IA_NA) {
1004                 if (T1) {
1005                         ia_options[4] = *T1 >> 24;
1006                         ia_options[5] = *T1 >> 16;
1007                         ia_options[6] = *T1 >> 8;
1008                         ia_options[7] = *T1;
1009                 } else
1010                         memset(&ia_options[4], 0x00, 4);
1011
1012                 if (T2) {
1013                         ia_options[8] = *T2 >> 24;
1014                         ia_options[9] = *T2 >> 16;
1015                         ia_options[10] = *T2 >> 8;
1016                         ia_options[11] = *T2;
1017                 } else
1018                         memset(&ia_options[8], 0x00, 4);
1019         }
1020
1021         g_dhcpv6_client_set_send(dhcp_client, code, ia_options, total_len);
1022
1023         g_free(ia_options);
1024
1025         return 0;
1026 }
1027
1028 int g_dhcpv6_client_set_oro(GDHCPClient *dhcp_client, int args, ...)
1029 {
1030         va_list va;
1031         int i, j, len = sizeof(uint16_t) * args;
1032         uint8_t *values;
1033
1034         values = g_try_malloc(len);
1035         if (!values)
1036                 return -ENOMEM;
1037
1038         va_start(va, args);
1039         for (i = 0, j = 0; i < args; i++) {
1040                 uint16_t value = va_arg(va, int);
1041                 values[j++] = value >> 8;
1042                 values[j++] = value & 0xff;
1043         }
1044         va_end(va);
1045
1046         g_dhcpv6_client_set_send(dhcp_client, G_DHCPV6_ORO, values, len);
1047
1048         g_free(values);
1049
1050         return 0;
1051 }
1052
1053 static int send_dhcpv6_msg(GDHCPClient *dhcp_client, int type, char *msg)
1054 {
1055         struct dhcpv6_packet *packet;
1056         uint8_t buf[MAX_DHCPV6_PKT_SIZE];
1057         unsigned char *ptr;
1058         int ret, max_buf;
1059
1060         memset(buf, 0, sizeof(buf));
1061         packet = (struct dhcpv6_packet *)&buf[0];
1062         ptr = buf + sizeof(struct dhcpv6_packet);
1063
1064         init_packet(dhcp_client, packet, type);
1065
1066         if (!dhcp_client->retransmit) {
1067                 dhcp_client->xid = packet->transaction_id[0] << 16 |
1068                                 packet->transaction_id[1] << 8 |
1069                                 packet->transaction_id[2];
1070                 gettimeofday(&dhcp_client->start_time, NULL);
1071         } else {
1072                 packet->transaction_id[0] = dhcp_client->xid >> 16;
1073                 packet->transaction_id[1] = dhcp_client->xid >> 8 ;
1074                 packet->transaction_id[2] = dhcp_client->xid;
1075         }
1076
1077         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_ELAPSED_TIME);
1078
1079         debug(dhcp_client, "sending DHCPv6 %s message xid 0x%04x", msg,
1080                                                         dhcp_client->xid);
1081
1082         max_buf = MAX_DHCPV6_PKT_SIZE - sizeof(struct dhcpv6_packet);
1083
1084         add_dhcpv6_request_options(dhcp_client, packet, buf, max_buf, &ptr);
1085
1086         add_dhcpv6_send_options(dhcp_client, buf, max_buf, &ptr);
1087
1088         ret = dhcpv6_send_packet(dhcp_client->ifindex, packet, ptr - buf);
1089
1090         debug(dhcp_client, "sent %d pkt %p len %d", ret, packet, ptr - buf);
1091         return ret;
1092 }
1093
1094 static int send_solicitation(GDHCPClient *dhcp_client)
1095 {
1096         return send_dhcpv6_msg(dhcp_client, DHCPV6_SOLICIT, "solicit");
1097 }
1098
1099 static int send_dhcpv6_request(GDHCPClient *dhcp_client)
1100 {
1101         return send_dhcpv6_msg(dhcp_client, DHCPV6_REQUEST, "request");
1102 }
1103
1104 static int send_dhcpv6_confirm(GDHCPClient *dhcp_client)
1105 {
1106         return send_dhcpv6_msg(dhcp_client, DHCPV6_CONFIRM, "confirm");
1107 }
1108
1109 static int send_dhcpv6_renew(GDHCPClient *dhcp_client)
1110 {
1111         return send_dhcpv6_msg(dhcp_client, DHCPV6_RENEW, "renew");
1112 }
1113
1114 static int send_dhcpv6_rebind(GDHCPClient *dhcp_client)
1115 {
1116         return send_dhcpv6_msg(dhcp_client, DHCPV6_REBIND, "rebind");
1117 }
1118
1119 static int send_dhcpv6_decline(GDHCPClient *dhcp_client)
1120 {
1121         return send_dhcpv6_msg(dhcp_client, DHCPV6_DECLINE, "decline");
1122 }
1123
1124 static int send_dhcpv6_release(GDHCPClient *dhcp_client)
1125 {
1126         return send_dhcpv6_msg(dhcp_client, DHCPV6_RELEASE, "release");
1127 }
1128
1129 static int send_information_req(GDHCPClient *dhcp_client)
1130 {
1131         return send_dhcpv6_msg(dhcp_client, DHCPV6_INFORMATION_REQ,
1132                                 "information-req");
1133 }
1134
1135 static void remove_value(gpointer data, gpointer user_data)
1136 {
1137         char *value = data;
1138         g_free(value);
1139 }
1140
1141 static void remove_option_value(gpointer data)
1142 {
1143         GList *option_value = data;
1144
1145         g_list_foreach(option_value, remove_value, NULL);
1146         g_list_free(option_value);
1147 }
1148
1149 GDHCPClient *g_dhcp_client_new(GDHCPType type,
1150                         int ifindex, GDHCPClientError *error)
1151 {
1152         GDHCPClient *dhcp_client;
1153
1154         if (ifindex < 0) {
1155                 *error = G_DHCP_CLIENT_ERROR_INVALID_INDEX;
1156                 return NULL;
1157         }
1158
1159         dhcp_client = g_try_new0(GDHCPClient, 1);
1160         if (!dhcp_client) {
1161                 *error = G_DHCP_CLIENT_ERROR_NOMEM;
1162                 return NULL;
1163         }
1164
1165         dhcp_client->interface = get_interface_name(ifindex);
1166         if (!dhcp_client->interface) {
1167                 *error = G_DHCP_CLIENT_ERROR_INTERFACE_UNAVAILABLE;
1168                 goto error;
1169         }
1170
1171         if (!interface_is_up(ifindex)) {
1172                 *error = G_DHCP_CLIENT_ERROR_INTERFACE_DOWN;
1173                 goto error;
1174         }
1175
1176         get_interface_mac_address(ifindex, dhcp_client->mac_address);
1177
1178         dhcp_client->listener_sockfd = -1;
1179         dhcp_client->listen_mode = L_NONE;
1180         dhcp_client->ref_count = 1;
1181         dhcp_client->type = type;
1182         dhcp_client->ifindex = ifindex;
1183         dhcp_client->lease_available_cb = NULL;
1184         dhcp_client->ipv4ll_available_cb = NULL;
1185         dhcp_client->no_lease_cb = NULL;
1186         dhcp_client->lease_lost_cb = NULL;
1187         dhcp_client->ipv4ll_lost_cb = NULL;
1188         dhcp_client->address_conflict_cb = NULL;
1189         dhcp_client->listener_watch = 0;
1190         dhcp_client->retry_times = 0;
1191         dhcp_client->ack_retry_times = 0;
1192         dhcp_client->code_value_hash = g_hash_table_new_full(g_direct_hash,
1193                                 g_direct_equal, NULL, remove_option_value);
1194         dhcp_client->send_value_hash = g_hash_table_new_full(g_direct_hash,
1195                                 g_direct_equal, NULL, g_free);
1196         dhcp_client->request_list = NULL;
1197         dhcp_client->require_list = NULL;
1198         dhcp_client->duid = NULL;
1199         dhcp_client->duid_len = 0;
1200         dhcp_client->last_request = time(NULL);
1201         dhcp_client->expire = 0;
1202         dhcp_client->request_bcast = false;
1203
1204         *error = G_DHCP_CLIENT_ERROR_NONE;
1205
1206         return dhcp_client;
1207
1208 error:
1209         g_free(dhcp_client->interface);
1210         g_free(dhcp_client);
1211         return NULL;
1212 }
1213
1214 #define SERVER_AND_CLIENT_PORTS  ((67 << 16) + 68)
1215
1216 static int dhcp_l2_socket(int ifindex)
1217 {
1218         int fd;
1219         struct sockaddr_ll sock;
1220
1221         /*
1222          * Comment:
1223          *
1224          *      I've selected not to see LL header, so BPF doesn't see it, too.
1225          *      The filter may also pass non-IP and non-ARP packets, but we do
1226          *      a more complete check when receiving the message in userspace.
1227          *
1228          * and filter shamelessly stolen from:
1229          *
1230          *      http://www.flamewarmaster.de/software/dhcpclient/
1231          *
1232          * There are a few other interesting ideas on that page (look under
1233          * "Motivation").  Use of netlink events is most interesting.  Think
1234          * of various network servers listening for events and reconfiguring.
1235          * That would obsolete sending HUP signals and/or make use of restarts.
1236          *
1237          * Copyright: 2006, 2007 Stefan Rompf <sux@loplof.de>.
1238          * License: GPL v2.
1239          *
1240          * TODO: make conditional?
1241          */
1242         static const struct sock_filter filter_instr[] = {
1243                 /* check for udp */
1244                 BPF_STMT(BPF_LD|BPF_B|BPF_ABS, 9),
1245                 /* L5, L1, is UDP? */
1246                 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, IPPROTO_UDP, 2, 0),
1247                 /* ugly check for arp on ethernet-like and IPv4 */
1248                 BPF_STMT(BPF_LD|BPF_W|BPF_ABS, 2), /* L1: */
1249                 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, 0x08000604, 3, 4),/* L3, L4 */
1250                 /* skip IP header */
1251                 BPF_STMT(BPF_LDX|BPF_B|BPF_MSH, 0), /* L5: */
1252                 /* check udp source and destination ports */
1253                 BPF_STMT(BPF_LD|BPF_W|BPF_IND, 0),
1254                 /* L3, L4 */
1255                 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, SERVER_AND_CLIENT_PORTS, 0, 1),
1256                 /* returns */
1257                 BPF_STMT(BPF_RET|BPF_K, 0x0fffffff), /* L3: pass */
1258                 BPF_STMT(BPF_RET|BPF_K, 0), /* L4: reject */
1259         };
1260
1261         static const struct sock_fprog filter_prog = {
1262                 .len = sizeof(filter_instr) / sizeof(filter_instr[0]),
1263                 /* casting const away: */
1264                 .filter = (struct sock_filter *) filter_instr,
1265         };
1266
1267         fd = socket(PF_PACKET, SOCK_DGRAM | SOCK_CLOEXEC, htons(ETH_P_IP));
1268         if (fd < 0)
1269                 return -errno;
1270
1271         if (SERVER_PORT == 67 && CLIENT_PORT == 68)
1272                 /* Use only if standard ports are in use */
1273                 setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER, &filter_prog,
1274                                                         sizeof(filter_prog));
1275
1276         memset(&sock, 0, sizeof(sock));
1277         sock.sll_family = AF_PACKET;
1278         sock.sll_protocol = htons(ETH_P_IP);
1279         sock.sll_ifindex = ifindex;
1280
1281         if (bind(fd, (struct sockaddr *) &sock, sizeof(sock)) != 0) {
1282                 int err = -errno;
1283                 close(fd);
1284                 return err;
1285         }
1286
1287         return fd;
1288 }
1289
1290 static bool sanity_check(struct ip_udp_dhcp_packet *packet, int bytes)
1291 {
1292         if (packet->ip.protocol != IPPROTO_UDP)
1293                 return false;
1294
1295         if (packet->ip.version != IPVERSION)
1296                 return false;
1297
1298         if (packet->ip.ihl != sizeof(packet->ip) >> 2)
1299                 return false;
1300
1301         if (packet->udp.dest != htons(CLIENT_PORT))
1302                 return false;
1303
1304         if (ntohs(packet->udp.len) != (uint16_t)(bytes - sizeof(packet->ip)))
1305                 return false;
1306
1307         return true;
1308 }
1309
1310 static int dhcp_recv_l2_packet(struct dhcp_packet *dhcp_pkt, int fd,
1311                                 struct sockaddr_in *dst_addr)
1312 {
1313         int bytes;
1314         struct ip_udp_dhcp_packet packet;
1315         uint16_t check;
1316
1317         memset(&packet, 0, sizeof(packet));
1318
1319         bytes = read(fd, &packet, sizeof(packet));
1320         if (bytes < 0)
1321                 return -1;
1322
1323         if (bytes < (int) (sizeof(packet.ip) + sizeof(packet.udp)))
1324                 return -1;
1325
1326         if (bytes < ntohs(packet.ip.tot_len))
1327                 /* packet is bigger than sizeof(packet), we did partial read */
1328                 return -1;
1329
1330         /* ignore any extra garbage bytes */
1331         bytes = ntohs(packet.ip.tot_len);
1332
1333         if (!sanity_check(&packet, bytes))
1334                 return -1;
1335
1336         check = packet.ip.check;
1337         packet.ip.check = 0;
1338         if (check != dhcp_checksum(&packet.ip, sizeof(packet.ip)))
1339                 return -1;
1340
1341         /* verify UDP checksum. IP header has to be modified for this */
1342         memset(&packet.ip, 0, offsetof(struct iphdr, protocol));
1343         /* ip.xx fields which are not memset: protocol, check, saddr, daddr */
1344         packet.ip.tot_len = packet.udp.len; /* yes, this is needed */
1345         check = packet.udp.check;
1346         packet.udp.check = 0;
1347         if (check && check != dhcp_checksum(&packet, bytes))
1348                 return -1;
1349
1350         memcpy(dhcp_pkt, &packet.data, bytes - (sizeof(packet.ip) +
1351                                                         sizeof(packet.udp)));
1352
1353         if (dhcp_pkt->cookie != htonl(DHCP_MAGIC))
1354                 return -1;
1355
1356         dst_addr->sin_addr.s_addr = packet.ip.daddr;
1357
1358         return bytes - (sizeof(packet.ip) + sizeof(packet.udp));
1359 }
1360
1361 static void ipv4ll_start(GDHCPClient *dhcp_client)
1362 {
1363         guint timeout;
1364         int seed;
1365
1366         remove_timeouts(dhcp_client);
1367
1368         switch_listening_mode(dhcp_client, L_NONE);
1369         dhcp_client->retry_times = 0;
1370         dhcp_client->requested_ip = 0;
1371
1372         /*try to start with a based mac address ip*/
1373         seed = (dhcp_client->mac_address[4] << 8 | dhcp_client->mac_address[4]);
1374         dhcp_client->requested_ip = ipv4ll_random_ip(seed);
1375
1376         /*first wait a random delay to avoid storm of arp request on boot*/
1377         timeout = ipv4ll_random_delay_ms(PROBE_WAIT);
1378
1379         dhcp_client->retry_times++;
1380         dhcp_client->timeout = g_timeout_add_full(G_PRIORITY_HIGH,
1381                                                 timeout,
1382                                                 send_probe_packet,
1383                                                 dhcp_client,
1384                                                 NULL);
1385 }
1386
1387 static void ipv4ll_stop(GDHCPClient *dhcp_client)
1388 {
1389
1390         switch_listening_mode(dhcp_client, L_NONE);
1391
1392         remove_timeouts(dhcp_client);
1393
1394         if (dhcp_client->listener_watch > 0) {
1395                 g_source_remove(dhcp_client->listener_watch);
1396                 dhcp_client->listener_watch = 0;
1397         }
1398
1399         dhcp_client->state = IPV4LL_PROBE;
1400         dhcp_client->retry_times = 0;
1401         dhcp_client->requested_ip = 0;
1402
1403         g_free(dhcp_client->assigned_ip);
1404         dhcp_client->assigned_ip = NULL;
1405 }
1406
1407 static int ipv4ll_recv_arp_packet(GDHCPClient *dhcp_client)
1408 {
1409         int bytes;
1410         struct ether_arp arp;
1411         uint32_t ip_requested;
1412         int source_conflict;
1413         int target_conflict;
1414
1415         memset(&arp, 0, sizeof(arp));
1416         bytes = read(dhcp_client->listener_sockfd, &arp, sizeof(arp));
1417         if (bytes < 0)
1418                 return bytes;
1419
1420         if (arp.arp_op != htons(ARPOP_REPLY) &&
1421                         arp.arp_op != htons(ARPOP_REQUEST))
1422                 return -EINVAL;
1423
1424         ip_requested = htonl(dhcp_client->requested_ip);
1425         source_conflict = !memcmp(arp.arp_spa, &ip_requested,
1426                                                 sizeof(ip_requested));
1427
1428         target_conflict = !memcmp(arp.arp_tpa, &ip_requested,
1429                                 sizeof(ip_requested));
1430
1431         if (!source_conflict && !target_conflict)
1432                 return 0;
1433
1434         dhcp_client->conflicts++;
1435
1436         debug(dhcp_client, "IPV4LL conflict detected");
1437
1438         if (dhcp_client->state == IPV4LL_MONITOR) {
1439                 if (!source_conflict)
1440                         return 0;
1441                 dhcp_client->state = IPV4LL_DEFEND;
1442                 debug(dhcp_client, "DEFEND mode conflicts : %d",
1443                         dhcp_client->conflicts);
1444                 /*Try to defend with a single announce*/
1445                 send_announce_packet(dhcp_client);
1446                 return 0;
1447         }
1448
1449         if (dhcp_client->state == IPV4LL_DEFEND) {
1450                 if (!source_conflict)
1451                         return 0;
1452                 else if (dhcp_client->ipv4ll_lost_cb)
1453                         dhcp_client->ipv4ll_lost_cb(dhcp_client,
1454                                                 dhcp_client->ipv4ll_lost_data);
1455         }
1456
1457         ipv4ll_stop(dhcp_client);
1458
1459         if (dhcp_client->conflicts < MAX_CONFLICTS) {
1460                 /*restart whole state machine*/
1461                 dhcp_client->retry_times++;
1462                 dhcp_client->timeout =
1463                         g_timeout_add_full(G_PRIORITY_HIGH,
1464                                         ipv4ll_random_delay_ms(PROBE_WAIT),
1465                                         send_probe_packet,
1466                                         dhcp_client,
1467                                         NULL);
1468         }
1469         /* Here we got a lot of conflicts, RFC3927 states that we have
1470          * to wait RATE_LIMIT_INTERVAL before retrying,
1471          * but we just report failure.
1472          */
1473         else if (dhcp_client->no_lease_cb)
1474                         dhcp_client->no_lease_cb(dhcp_client,
1475                                                 dhcp_client->no_lease_data);
1476
1477         return 0;
1478 }
1479
1480 static bool check_package_owner(GDHCPClient *dhcp_client, gpointer pkt)
1481 {
1482         if (dhcp_client->type == G_DHCP_IPV6) {
1483                 struct dhcpv6_packet *packet6 = pkt;
1484                 uint32_t xid;
1485
1486                 if (!packet6)
1487                         return false;
1488
1489                 xid = packet6->transaction_id[0] << 16 |
1490                         packet6->transaction_id[1] << 8 |
1491                         packet6->transaction_id[2];
1492
1493                 if (xid != dhcp_client->xid)
1494                         return false;
1495         } else {
1496                 struct dhcp_packet *packet = pkt;
1497
1498                 if (packet->xid != dhcp_client->xid)
1499                         return false;
1500
1501                 if (packet->hlen != 6)
1502                         return false;
1503
1504                 if (memcmp(packet->chaddr, dhcp_client->mac_address, 6))
1505                         return false;
1506         }
1507
1508         return true;
1509 }
1510
1511 static void start_request(GDHCPClient *dhcp_client);
1512
1513 static gboolean request_timeout(gpointer user_data)
1514 {
1515         GDHCPClient *dhcp_client = user_data;
1516
1517         debug(dhcp_client, "request timeout (retries %d)",
1518                                         dhcp_client->retry_times);
1519
1520         dhcp_client->retry_times++;
1521
1522         start_request(dhcp_client);
1523
1524         return FALSE;
1525 }
1526
1527 static gboolean listener_event(GIOChannel *channel, GIOCondition condition,
1528                                                         gpointer user_data);
1529
1530 static int switch_listening_mode(GDHCPClient *dhcp_client,
1531                                         ListenMode listen_mode)
1532 {
1533         GIOChannel *listener_channel;
1534         int listener_sockfd;
1535
1536         if (dhcp_client->listen_mode == listen_mode)
1537                 return 0;
1538
1539         debug(dhcp_client, "switch listening mode (%d ==> %d)",
1540                                 dhcp_client->listen_mode, listen_mode);
1541
1542         if (dhcp_client->listen_mode != L_NONE) {
1543                 if (dhcp_client->listener_watch > 0)
1544                         g_source_remove(dhcp_client->listener_watch);
1545                 dhcp_client->listen_mode = L_NONE;
1546                 dhcp_client->listener_sockfd = -1;
1547                 dhcp_client->listener_watch = 0;
1548         }
1549
1550         if (listen_mode == L_NONE)
1551                 return 0;
1552
1553         if (listen_mode == L2)
1554                 listener_sockfd = dhcp_l2_socket(dhcp_client->ifindex);
1555         else if (listen_mode == L3) {
1556                 if (dhcp_client->type == G_DHCP_IPV6)
1557                         listener_sockfd = dhcp_l3_socket(DHCPV6_CLIENT_PORT,
1558                                                         dhcp_client->interface,
1559                                                         AF_INET6);
1560                 else
1561                         listener_sockfd = dhcp_l3_socket(CLIENT_PORT,
1562                                                         dhcp_client->interface,
1563                                                         AF_INET);
1564         } else if (listen_mode == L_ARP)
1565                 listener_sockfd = ipv4ll_arp_socket(dhcp_client->ifindex);
1566         else
1567                 return -EIO;
1568
1569         if (listener_sockfd < 0)
1570                 return -EIO;
1571
1572         listener_channel = g_io_channel_unix_new(listener_sockfd);
1573         if (!listener_channel) {
1574                 /* Failed to create listener channel */
1575                 close(listener_sockfd);
1576                 return -EIO;
1577         }
1578
1579         dhcp_client->listen_mode = listen_mode;
1580         dhcp_client->listener_sockfd = listener_sockfd;
1581
1582         g_io_channel_set_close_on_unref(listener_channel, TRUE);
1583         dhcp_client->listener_watch =
1584                         g_io_add_watch_full(listener_channel, G_PRIORITY_HIGH,
1585                                 G_IO_IN | G_IO_NVAL | G_IO_ERR | G_IO_HUP,
1586                                                 listener_event, dhcp_client,
1587                                                                 NULL);
1588         g_io_channel_unref(listener_channel);
1589
1590         return 0;
1591 }
1592
1593 static void start_request(GDHCPClient *dhcp_client)
1594 {
1595         debug(dhcp_client, "start request (retries %d)",
1596                                         dhcp_client->retry_times);
1597
1598         if (dhcp_client->retry_times == REQUEST_RETRIES) {
1599                 if (dhcp_client->no_lease_cb)
1600                         dhcp_client->no_lease_cb(dhcp_client,
1601                                                 dhcp_client->no_lease_data);
1602                 return;
1603         }
1604
1605         if (dhcp_client->retry_times == 0) {
1606                 dhcp_client->state = REQUESTING;
1607                 switch_listening_mode(dhcp_client, L2);
1608         }
1609
1610         send_request(dhcp_client);
1611
1612         dhcp_client->timeout = g_timeout_add_seconds_full(G_PRIORITY_HIGH,
1613                                                         REQUEST_TIMEOUT,
1614                                                         request_timeout,
1615                                                         dhcp_client,
1616                                                         NULL);
1617 }
1618
1619 static uint32_t get_lease(struct dhcp_packet *packet)
1620 {
1621         uint8_t *option;
1622         uint32_t lease_seconds;
1623
1624         option = dhcp_get_option(packet, DHCP_LEASE_TIME);
1625         if (!option)
1626                 return 3600;
1627
1628         lease_seconds = get_be32(option);
1629         /* paranoia: must not be prone to overflows */
1630         lease_seconds &= 0x0fffffff;
1631         if (lease_seconds < 10)
1632                 lease_seconds = 10;
1633
1634         return lease_seconds;
1635 }
1636
1637 static void restart_dhcp(GDHCPClient *dhcp_client, int retry_times)
1638 {
1639         debug(dhcp_client, "restart DHCP (retries %d)", retry_times);
1640
1641         remove_timeouts(dhcp_client);
1642
1643         dhcp_client->retry_times = retry_times;
1644         dhcp_client->requested_ip = 0;
1645         dhcp_client->state = INIT_SELECTING;
1646         switch_listening_mode(dhcp_client, L2);
1647
1648         g_dhcp_client_start(dhcp_client, dhcp_client->last_address);
1649 }
1650
1651 static gboolean start_expire(gpointer user_data)
1652 {
1653         GDHCPClient *dhcp_client = user_data;
1654
1655         debug(dhcp_client, "lease expired");
1656
1657         /*remove all timeouts if they are set*/
1658         remove_timeouts(dhcp_client);
1659
1660         restart_dhcp(dhcp_client, 0);
1661
1662         /* ip need to be cleared */
1663         if (dhcp_client->lease_lost_cb)
1664                 dhcp_client->lease_lost_cb(dhcp_client,
1665                                 dhcp_client->lease_lost_data);
1666
1667         return false;
1668 }
1669
1670 static gboolean continue_rebound(gpointer user_data)
1671 {
1672         GDHCPClient *dhcp_client = user_data;
1673
1674         switch_listening_mode(dhcp_client, L2);
1675         send_request(dhcp_client);
1676
1677         if (dhcp_client->t2_timeout> 0)
1678                 g_source_remove(dhcp_client->t2_timeout);
1679
1680         /*recalculate remaining rebind time*/
1681         dhcp_client->T2 >>= 1;
1682         if (dhcp_client->T2 > 60) {
1683                 dhcp_client->t2_timeout =
1684                         g_timeout_add_full(G_PRIORITY_HIGH,
1685                                         dhcp_client->T2 * 1000 + (rand() % 2000) - 1000,
1686                                         continue_rebound,
1687                                         dhcp_client,
1688                                         NULL);
1689         }
1690
1691         return FALSE;
1692 }
1693
1694 static gboolean start_rebound(gpointer user_data)
1695 {
1696         GDHCPClient *dhcp_client = user_data;
1697
1698         /*remove renew timer*/
1699         if (dhcp_client->t1_timeout > 0)
1700                 g_source_remove(dhcp_client->t1_timeout);
1701
1702         debug(dhcp_client, "start rebound");
1703         dhcp_client->state = REBINDING;
1704
1705         /*calculate total rebind time*/
1706         dhcp_client->T2 = dhcp_client->expire - dhcp_client->T2;
1707
1708         /*send the first rebound and reschedule*/
1709         continue_rebound(user_data);
1710
1711         return FALSE;
1712 }
1713
1714 static gboolean continue_renew (gpointer user_data)
1715 {
1716         GDHCPClient *dhcp_client = user_data;
1717
1718         switch_listening_mode(dhcp_client, L3);
1719         send_request(dhcp_client);
1720
1721         if (dhcp_client->t1_timeout > 0)
1722                 g_source_remove(dhcp_client->t1_timeout);
1723
1724         dhcp_client->T1 >>= 1;
1725
1726         if (dhcp_client->T1 > 60) {
1727                 dhcp_client->t1_timeout = g_timeout_add_full(G_PRIORITY_HIGH,
1728                                 dhcp_client->T1 * 1000 + (rand() % 2000) - 1000,
1729                                 continue_renew,
1730                                 dhcp_client,
1731                                 NULL);
1732         }
1733
1734         return FALSE;
1735 }
1736 static gboolean start_renew(gpointer user_data)
1737 {
1738         GDHCPClient *dhcp_client = user_data;
1739
1740         debug(dhcp_client, "start renew");
1741         dhcp_client->state = RENEWING;
1742
1743         /*calculate total renew period*/
1744         dhcp_client->T1 = dhcp_client->T2 - dhcp_client->T1;
1745
1746         /*send first renew and reschedule for half the remaining time.*/
1747         continue_renew(user_data);
1748
1749         return FALSE;
1750 }
1751
1752 static void start_bound(GDHCPClient *dhcp_client)
1753 {
1754         debug(dhcp_client, "start bound");
1755
1756         dhcp_client->state = BOUND;
1757
1758         remove_timeouts(dhcp_client);
1759
1760         /*
1761          *TODO: T1 and T2 should be set through options instead of
1762          * defaults as they are here.
1763          */
1764
1765         dhcp_client->T1 = dhcp_client->lease_seconds >> 1;
1766         dhcp_client->T2 = dhcp_client->lease_seconds * 0.875;
1767         dhcp_client->expire = dhcp_client->lease_seconds;
1768
1769         dhcp_client->t1_timeout = g_timeout_add_seconds_full(G_PRIORITY_HIGH,
1770                                         dhcp_client->T1,
1771                                         start_renew, dhcp_client,
1772                                                         NULL);
1773
1774         dhcp_client->t2_timeout = g_timeout_add_seconds_full(G_PRIORITY_HIGH,
1775                                         dhcp_client->T2,
1776                                         start_rebound, dhcp_client,
1777                                                         NULL);
1778
1779         dhcp_client->lease_timeout= g_timeout_add_seconds_full(G_PRIORITY_HIGH,
1780                                         dhcp_client->expire,
1781                                         start_expire, dhcp_client,
1782                                                         NULL);
1783 }
1784
1785 static gboolean restart_dhcp_timeout(gpointer user_data)
1786 {
1787         GDHCPClient *dhcp_client = user_data;
1788
1789         debug(dhcp_client, "restart DHCP timeout");
1790
1791         if (dhcp_client->state == REBOOTING) {
1792                 g_free(dhcp_client->last_address);
1793                 dhcp_client->last_address = NULL;
1794                 restart_dhcp(dhcp_client, 0);
1795         } else {
1796                 dhcp_client->ack_retry_times++;
1797                 restart_dhcp(dhcp_client, dhcp_client->ack_retry_times);
1798         }
1799         return FALSE;
1800 }
1801
1802 static char *get_ip(uint32_t ip)
1803 {
1804         struct in_addr addr;
1805
1806         addr.s_addr = ip;
1807
1808         return g_strdup(inet_ntoa(addr));
1809 }
1810
1811 static GList *get_option_value_list(char *value, GDHCPOptionType type)
1812 {
1813         char *pos = value;
1814         GList *list = NULL;
1815
1816         if (!pos)
1817                 return NULL;
1818
1819         if (type == OPTION_STRING)
1820                 return g_list_append(list, g_strdup(value));
1821
1822         while ((pos = strchr(pos, ' '))) {
1823                 *pos = '\0';
1824
1825                 list = g_list_append(list, g_strdup(value));
1826
1827                 value = ++pos;
1828         }
1829
1830         list = g_list_append(list, g_strdup(value));
1831
1832         return list;
1833 }
1834
1835 static inline uint32_t get_uint32(unsigned char *value)
1836 {
1837         return value[0] << 24 | value[1] << 16 |
1838                 value[2] << 8 | value[3];
1839 }
1840
1841 static inline uint16_t get_uint16(unsigned char *value)
1842 {
1843         return value[0] << 8 | value[1];
1844 }
1845
1846 static GList *add_prefix(GDHCPClient *dhcp_client, GList *list,
1847                         struct in6_addr *addr,
1848                         unsigned char prefixlen, uint32_t preferred,
1849                         uint32_t valid)
1850 {
1851         GDHCPIAPrefix *ia_prefix;
1852
1853         ia_prefix = g_try_new(GDHCPIAPrefix, 1);
1854         if (!ia_prefix)
1855                 return list;
1856
1857         if (dhcp_client->debug_func) {
1858                 char addr_str[INET6_ADDRSTRLEN + 1];
1859                 inet_ntop(AF_INET6, addr, addr_str, INET6_ADDRSTRLEN);
1860                 debug(dhcp_client, "prefix %s/%d preferred %u valid %u",
1861                         addr_str, prefixlen, preferred, valid);
1862         }
1863
1864         memcpy(&ia_prefix->prefix, addr, sizeof(struct in6_addr));
1865         ia_prefix->prefixlen = prefixlen;
1866         ia_prefix->preferred = preferred;
1867         ia_prefix->valid = valid;
1868         ia_prefix->expire = time(NULL) + valid;
1869
1870         return g_list_prepend(list, ia_prefix);
1871 }
1872
1873 static GList *get_addresses(GDHCPClient *dhcp_client,
1874                                 int code, int len,
1875                                 unsigned char *value,
1876                                 uint16_t *status)
1877 {
1878         GList *list = NULL;
1879         struct in6_addr addr;
1880         uint32_t iaid, T1 = 0, T2 = 0, preferred = 0, valid = 0;
1881         uint16_t option_len, option_code, st = 0, max_len;
1882         int addr_count = 0, prefix_count = 0, i, pos;
1883         unsigned char prefixlen;
1884         unsigned int shortest_valid = 0;
1885         uint8_t *option;
1886         char *str;
1887
1888         if (!value || len < 4)
1889                 return NULL;
1890
1891         iaid = get_uint32(&value[0]);
1892         if (dhcp_client->iaid != iaid)
1893                 return NULL;
1894
1895         if (code == G_DHCPV6_IA_NA || code == G_DHCPV6_IA_PD) {
1896                 T1 = get_uint32(&value[4]);
1897                 T2 = get_uint32(&value[8]);
1898
1899                 if (T1 > T2)
1900                         /* IA_NA: RFC 3315, 22.4 */
1901                         /* IA_PD: RFC 3633, ch 9 */
1902                         return NULL;
1903
1904                 pos = 12;
1905         } else
1906                 pos = 4;
1907
1908         if (len <= pos)
1909                 return NULL;
1910
1911         max_len = len - pos;
1912
1913         debug(dhcp_client, "header %d sub-option max len %d", pos, max_len);
1914
1915         /* We have more sub-options in this packet. */
1916         do {
1917                 option = dhcpv6_get_sub_option(&value[pos], max_len,
1918                                         &option_code, &option_len);
1919
1920                 debug(dhcp_client, "pos %d option %p code %d len %d",
1921                         pos, option, option_code, option_len);
1922
1923                 if (!option)
1924                         break;
1925
1926                 if (pos >= len)
1927                         break;
1928
1929                 switch (option_code) {
1930                 case G_DHCPV6_IAADDR:
1931                         i = 0;
1932                         memcpy(&addr, &option[0], sizeof(addr));
1933                         i += sizeof(addr);
1934                         preferred = get_uint32(&option[i]);
1935                         i += 4;
1936                         valid = get_uint32(&option[i]);
1937
1938                         addr_count++;
1939                         break;
1940
1941                 case G_DHCPV6_STATUS_CODE:
1942                         st = get_uint16(&option[0]);
1943                         debug(dhcp_client, "error code %d", st);
1944                         if (option_len > 2) {
1945                                 str = g_strndup((gchar *)&option[2],
1946                                                 option_len - 2);
1947                                 debug(dhcp_client, "error text: %s", str);
1948                                 g_free(str);
1949                         }
1950
1951                         *status = st;
1952                         break;
1953
1954                 case G_DHCPV6_IA_PREFIX:
1955                         i = 0;
1956                         preferred = get_uint32(&option[i]);
1957                         i += 4;
1958                         valid = get_uint32(&option[i]);
1959                         i += 4;
1960                         prefixlen = option[i];
1961                         i += 1;
1962                         memcpy(&addr, &option[i], sizeof(addr));
1963                         i += sizeof(addr);
1964                         if (preferred < valid) {
1965                                 /* RFC 3633, ch 10 */
1966                                 list = add_prefix(dhcp_client, list, &addr,
1967                                                 prefixlen, preferred, valid);
1968                                 if (shortest_valid > valid)
1969                                         shortest_valid = valid;
1970                                 prefix_count++;
1971                         }
1972                         break;
1973                 }
1974
1975                 pos += 2 + 2 + option_len;
1976
1977         } while (pos < len);
1978
1979         if (addr_count > 0 && st == 0) {
1980                 /* We only support one address atm */
1981                 char addr_str[INET6_ADDRSTRLEN + 1];
1982
1983                 if (preferred > valid)
1984                         /* RFC 3315, 22.6 */
1985                         return NULL;
1986
1987                 dhcp_client->T1 = T1;
1988                 dhcp_client->T2 = T2;
1989
1990                 inet_ntop(AF_INET6, &addr, addr_str, INET6_ADDRSTRLEN);
1991                 debug(dhcp_client, "address count %d addr %s T1 %u T2 %u",
1992                         addr_count, addr_str, T1, T2);
1993
1994                 list = g_list_append(list, g_strdup(addr_str));
1995
1996                 if (code == G_DHCPV6_IA_NA)
1997                         memcpy(&dhcp_client->ia_na, &addr,
1998                                                 sizeof(struct in6_addr));
1999                 else
2000                         memcpy(&dhcp_client->ia_ta, &addr,
2001                                                 sizeof(struct in6_addr));
2002
2003                 if (valid != dhcp_client->expire)
2004                         dhcp_client->expire = valid;
2005         }
2006
2007         if (prefix_count > 0 && list) {
2008                 /*
2009                  * This means we have a list of prefixes to delegate.
2010                  */
2011                 list = g_list_reverse(list);
2012
2013                 debug(dhcp_client, "prefix count %d T1 %u T2 %u",
2014                         prefix_count, T1, T2);
2015
2016                 dhcp_client->T1 = T1;
2017                 dhcp_client->T2 = T2;
2018
2019                 dhcp_client->expire = shortest_valid;
2020         }
2021
2022         if (status && *status != 0)
2023                 debug(dhcp_client, "status %d", *status);
2024
2025         return list;
2026 }
2027
2028 static GList *get_domains(int maxlen, unsigned char *value)
2029
2030 {
2031         GList *list = NULL;
2032         int pos = 0;
2033         unsigned char *c;
2034         char dns_name[NS_MAXDNAME + 1];
2035
2036         if (!value || maxlen < 3)
2037                 return NULL;
2038
2039         while (pos < maxlen) {
2040                 strncpy(dns_name, (char *)&value[pos], NS_MAXDNAME);
2041
2042                 c = (unsigned char *)dns_name;
2043                 while (c && *c) {
2044                         int jump;
2045                         jump = *c;
2046                         *c = '.';
2047                         c += jump + 1;
2048                 }
2049                 list = g_list_prepend(list, g_strdup(&dns_name[1]));
2050                 pos += (char *)c - dns_name + 1;
2051         }
2052
2053         return g_list_reverse(list);
2054 }
2055
2056 static GList *get_dhcpv6_option_value_list(GDHCPClient *dhcp_client,
2057                                         int code, int len,
2058                                         unsigned char *value,
2059                                         uint16_t *status)
2060 {
2061         GList *list = NULL;
2062         char *str;
2063         int i;
2064
2065         if (!value)
2066                 return NULL;
2067
2068         switch (code) {
2069         case G_DHCPV6_DNS_SERVERS:      /* RFC 3646, chapter 3 */
2070         case G_DHCPV6_SNTP_SERVERS:     /* RFC 4075, chapter 4 */
2071                 if (len % 16) {
2072                         debug(dhcp_client,
2073                                 "%s server list length (%d) is invalid",
2074                                 code == G_DHCPV6_DNS_SERVERS ? "DNS" : "SNTP",
2075                                 len);
2076                         return NULL;
2077                 }
2078                 for (i = 0; i < len; i += 16) {
2079
2080                         str = g_try_malloc0(INET6_ADDRSTRLEN+1);
2081                         if (!str)
2082                                 return list;
2083
2084                         if (!inet_ntop(AF_INET6, &value[i], str,
2085                                         INET6_ADDRSTRLEN))
2086                                 g_free(str);
2087                         else
2088                                 list = g_list_append(list, str);
2089                 }
2090                 break;
2091
2092         case G_DHCPV6_IA_NA:            /* RFC 3315, chapter 22.4 */
2093         case G_DHCPV6_IA_TA:            /* RFC 3315, chapter 22.5 */
2094         case G_DHCPV6_IA_PD:            /* RFC 3633, chapter 9 */
2095                 list = get_addresses(dhcp_client, code, len, value, status);
2096                 break;
2097
2098         case G_DHCPV6_DOMAIN_LIST:
2099                 list = get_domains(len, value);
2100                 break;
2101
2102         default:
2103                 break;
2104         }
2105
2106         return list;
2107 }
2108
2109 static void get_dhcpv6_request(GDHCPClient *dhcp_client,
2110                                 struct dhcpv6_packet *packet,
2111                                 uint16_t pkt_len, uint16_t *status)
2112 {
2113         GList *list, *value_list;
2114         uint8_t *option;
2115         uint16_t code;
2116         uint16_t option_len;
2117
2118         for (list = dhcp_client->request_list; list; list = list->next) {
2119                 code = (uint16_t) GPOINTER_TO_INT(list->data);
2120
2121                 option = dhcpv6_get_option(packet, pkt_len, code, &option_len,
2122                                                 NULL);
2123                 if (!option) {
2124                         g_hash_table_remove(dhcp_client->code_value_hash,
2125                                                 GINT_TO_POINTER((int) code));
2126                         continue;
2127                 }
2128
2129                 value_list = get_dhcpv6_option_value_list(dhcp_client, code,
2130                                                 option_len, option, status);
2131
2132                 debug(dhcp_client, "code %d %p len %d list %p", code, option,
2133                         option_len, value_list);
2134
2135                 if (!value_list)
2136                         g_hash_table_remove(dhcp_client->code_value_hash,
2137                                                 GINT_TO_POINTER((int) code));
2138                 else
2139                         g_hash_table_insert(dhcp_client->code_value_hash,
2140                                 GINT_TO_POINTER((int) code), value_list);
2141         }
2142 }
2143
2144 static void get_request(GDHCPClient *dhcp_client, struct dhcp_packet *packet)
2145 {
2146         GDHCPOptionType type;
2147         GList *list, *value_list;
2148         char *option_value;
2149         uint8_t *option;
2150         uint8_t code;
2151
2152         for (list = dhcp_client->request_list; list; list = list->next) {
2153                 code = (uint8_t) GPOINTER_TO_INT(list->data);
2154
2155                 option = dhcp_get_option(packet, code);
2156                 if (!option) {
2157                         g_hash_table_remove(dhcp_client->code_value_hash,
2158                                                 GINT_TO_POINTER((int) code));
2159                         continue;
2160                 }
2161
2162                 type =  dhcp_get_code_type(code);
2163
2164                 option_value = malloc_option_value_string(option, type);
2165                 if (!option_value)
2166                         g_hash_table_remove(dhcp_client->code_value_hash,
2167                                                 GINT_TO_POINTER((int) code));
2168
2169                 value_list = get_option_value_list(option_value, type);
2170
2171                 g_free(option_value);
2172
2173                 if (!value_list)
2174                         g_hash_table_remove(dhcp_client->code_value_hash,
2175                                                 GINT_TO_POINTER((int) code));
2176                 else
2177                         g_hash_table_insert(dhcp_client->code_value_hash,
2178                                 GINT_TO_POINTER((int) code), value_list);
2179         }
2180 }
2181
2182 static gboolean listener_event(GIOChannel *channel, GIOCondition condition,
2183                                                         gpointer user_data)
2184 {
2185         GDHCPClient *dhcp_client = user_data;
2186         struct sockaddr_in dst_addr = { 0 };
2187         struct dhcp_packet packet;
2188         struct dhcpv6_packet *packet6 = NULL;
2189         uint8_t *message_type = NULL, *client_id = NULL, *option,
2190                 *server_id = NULL;
2191         uint16_t option_len = 0, status = 0;
2192         uint32_t xid = 0;
2193         gpointer pkt;
2194         unsigned char buf[MAX_DHCPV6_PKT_SIZE];
2195         uint16_t pkt_len = 0;
2196         int count;
2197         int re;
2198
2199         if (condition & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
2200                 dhcp_client->listener_watch = 0;
2201                 return FALSE;
2202         }
2203
2204         if (dhcp_client->listen_mode == L_NONE)
2205                 return FALSE;
2206
2207         pkt = &packet;
2208
2209         dhcp_client->status_code = 0;
2210
2211         if (dhcp_client->listen_mode == L2) {
2212                 re = dhcp_recv_l2_packet(&packet,
2213                                         dhcp_client->listener_sockfd,
2214                                         &dst_addr);
2215                 xid = packet.xid;
2216         } else if (dhcp_client->listen_mode == L3) {
2217                 if (dhcp_client->type == G_DHCP_IPV6) {
2218                         re = dhcpv6_recv_l3_packet(&packet6, buf, sizeof(buf),
2219                                                 dhcp_client->listener_sockfd);
2220                         pkt_len = re;
2221                         pkt = packet6;
2222                         xid = packet6->transaction_id[0] << 16 |
2223                                 packet6->transaction_id[1] << 8 |
2224                                 packet6->transaction_id[2];
2225                 } else {
2226                         re = dhcp_recv_l3_packet(&packet,
2227                                                 dhcp_client->listener_sockfd);
2228                         xid = packet.xid;
2229                 }
2230         } else if (dhcp_client->listen_mode == L_ARP) {
2231                 ipv4ll_recv_arp_packet(dhcp_client);
2232                 return TRUE;
2233         } else
2234                 re = -EIO;
2235
2236         if (re < 0)
2237                 return TRUE;
2238
2239         if (!check_package_owner(dhcp_client, pkt))
2240                 return TRUE;
2241
2242         if (dhcp_client->type == G_DHCP_IPV6) {
2243                 if (!packet6)
2244                         return TRUE;
2245
2246                 count = 0;
2247                 client_id = dhcpv6_get_option(packet6, pkt_len,
2248                                 G_DHCPV6_CLIENTID, &option_len, &count);
2249
2250                 if (!client_id || count == 0 || option_len == 0 ||
2251                                 memcmp(dhcp_client->duid, client_id,
2252                                         dhcp_client->duid_len) != 0) {
2253                         debug(dhcp_client,
2254                                 "client duid error, discarding msg %p/%d/%d",
2255                                 client_id, option_len, count);
2256                         return TRUE;
2257                 }
2258
2259                 option = dhcpv6_get_option(packet6, pkt_len,
2260                                 G_DHCPV6_STATUS_CODE, &option_len, NULL);
2261                 if (option != 0 && option_len > 0) {
2262                         status = option[0]<<8 | option[1];
2263                         if (status != 0) {
2264                                 debug(dhcp_client, "error code %d", status);
2265                                 if (option_len > 2) {
2266                                         gchar *txt = g_strndup(
2267                                                 (gchar *)&option[2],
2268                                                 option_len - 2);
2269                                         debug(dhcp_client, "error text: %s",
2270                                                 txt);
2271                                         g_free(txt);
2272                                 }
2273                         }
2274                         dhcp_client->status_code = status;
2275                 }
2276         } else {
2277                 message_type = dhcp_get_option(&packet, DHCP_MESSAGE_TYPE);
2278                 if (!message_type)
2279                         return TRUE;
2280         }
2281
2282         if (!message_type && !client_id)
2283                 /* No message type / client id option, ignore package */
2284                 return TRUE;
2285
2286         debug(dhcp_client, "received DHCP packet xid 0x%04x "
2287                 "(current state %d)", ntohl(xid), dhcp_client->state);
2288
2289         switch (dhcp_client->state) {
2290         case INIT_SELECTING:
2291                 if (*message_type != DHCPOFFER)
2292                         return TRUE;
2293
2294                 remove_timeouts(dhcp_client);
2295                 dhcp_client->timeout = 0;
2296                 dhcp_client->retry_times = 0;
2297
2298                 option = dhcp_get_option(&packet, DHCP_SERVER_ID);
2299                 dhcp_client->server_ip = get_be32(option);
2300                 dhcp_client->requested_ip = ntohl(packet.yiaddr);
2301
2302                 dhcp_client->state = REQUESTING;
2303
2304                 if (dst_addr.sin_addr.s_addr == INADDR_BROADCAST)
2305                         dhcp_client->request_bcast = true;
2306                 else
2307                         dhcp_client->request_bcast = false;
2308
2309                 debug(dhcp_client, "init ip %s -> %sadding broadcast flag",
2310                         inet_ntoa(dst_addr.sin_addr),
2311                         dhcp_client->request_bcast ? "" : "not ");
2312
2313                 start_request(dhcp_client);
2314
2315                 return TRUE;
2316         case REBOOTING:
2317                 if (dst_addr.sin_addr.s_addr == INADDR_BROADCAST)
2318                         dhcp_client->request_bcast = true;
2319                 else
2320                         dhcp_client->request_bcast = false;
2321
2322                 debug(dhcp_client, "ip %s -> %sadding broadcast flag",
2323                         inet_ntoa(dst_addr.sin_addr),
2324                         dhcp_client->request_bcast ? "" : "not ");
2325                 /* fall through */
2326         case REQUESTING:
2327         case RENEWING:
2328         case REBINDING:
2329                 if (*message_type == DHCPACK) {
2330                         dhcp_client->retry_times = 0;
2331
2332                         remove_timeouts(dhcp_client);
2333
2334                         dhcp_client->lease_seconds = get_lease(&packet);
2335
2336                         get_request(dhcp_client, &packet);
2337
2338                         switch_listening_mode(dhcp_client, L_NONE);
2339
2340                         g_free(dhcp_client->assigned_ip);
2341                         dhcp_client->assigned_ip = get_ip(packet.yiaddr);
2342
2343                         if (dhcp_client->state == REBOOTING) {
2344                                 option = dhcp_get_option(&packet,
2345                                                         DHCP_SERVER_ID);
2346                                 dhcp_client->server_ip = get_be32(option);
2347                         }
2348
2349                         /* Address should be set up here */
2350                         if (dhcp_client->lease_available_cb)
2351                                 dhcp_client->lease_available_cb(dhcp_client,
2352                                         dhcp_client->lease_available_data);
2353
2354                         start_bound(dhcp_client);
2355                 } else if (*message_type == DHCPNAK) {
2356                         dhcp_client->retry_times = 0;
2357
2358                         remove_timeouts(dhcp_client);
2359
2360                         dhcp_client->timeout = g_timeout_add_seconds_full(
2361                                                         G_PRIORITY_HIGH, 3,
2362                                                         restart_dhcp_timeout,
2363                                                         dhcp_client,
2364                                                         NULL);
2365                 }
2366
2367                 break;
2368         case SOLICITATION:
2369                 if (dhcp_client->type != G_DHCP_IPV6)
2370                         return TRUE;
2371
2372                 if (packet6->message != DHCPV6_REPLY &&
2373                                 packet6->message != DHCPV6_ADVERTISE)
2374                         return TRUE;
2375
2376                 count = 0;
2377                 server_id = dhcpv6_get_option(packet6, pkt_len,
2378                                 G_DHCPV6_SERVERID, &option_len, &count);
2379                 if (!server_id || count != 1 || option_len == 0) {
2380                         /* RFC 3315, 15.10 */
2381                         debug(dhcp_client,
2382                                 "server duid error, discarding msg %p/%d/%d",
2383                                 server_id, option_len, count);
2384                         return TRUE;
2385                 }
2386                 dhcp_client->server_duid = g_try_malloc(option_len);
2387                 if (!dhcp_client->server_duid)
2388                         return TRUE;
2389                 memcpy(dhcp_client->server_duid, server_id, option_len);
2390                 dhcp_client->server_duid_len = option_len;
2391
2392                 if (packet6->message == DHCPV6_REPLY) {
2393                         uint8_t *rapid_commit;
2394                         count = 0;
2395                         option_len = 0;
2396                         rapid_commit = dhcpv6_get_option(packet6, pkt_len,
2397                                                         G_DHCPV6_RAPID_COMMIT,
2398                                                         &option_len, &count);
2399                         if (!rapid_commit || option_len == 0 ||
2400                                                                 count != 1)
2401                                 /* RFC 3315, 17.1.4 */
2402                                 return TRUE;
2403                 }
2404
2405                 switch_listening_mode(dhcp_client, L_NONE);
2406
2407                 if (dhcp_client->status_code == 0)
2408                         get_dhcpv6_request(dhcp_client, packet6, pkt_len,
2409                                         &dhcp_client->status_code);
2410
2411                 if (packet6->message == DHCPV6_ADVERTISE) {
2412                         if (dhcp_client->advertise_cb)
2413                                 dhcp_client->advertise_cb(dhcp_client,
2414                                                 dhcp_client->advertise_data);
2415                         return TRUE;
2416                 }
2417
2418                 if (dhcp_client->solicitation_cb) {
2419                         /*
2420                          * The dhcp_client might not be valid after the
2421                          * callback call so just return immediately.
2422                          */
2423                         dhcp_client->solicitation_cb(dhcp_client,
2424                                         dhcp_client->solicitation_data);
2425                         return TRUE;
2426                 }
2427                 break;
2428         case REBIND:
2429                 if (dhcp_client->type != G_DHCP_IPV6)
2430                         return TRUE;
2431
2432                 server_id = dhcpv6_get_option(packet6, pkt_len,
2433                                 G_DHCPV6_SERVERID, &option_len, &count);
2434                 if (!dhcp_client->server_duid && server_id &&
2435                                                                 count == 1) {
2436                         /*
2437                          * If we do not have server duid yet, then get it now.
2438                          * Prefix delegation renew support needs it.
2439                          */
2440                         dhcp_client->server_duid = g_try_malloc(option_len);
2441                         if (!dhcp_client->server_duid)
2442                                 return TRUE;
2443                         memcpy(dhcp_client->server_duid, server_id, option_len);
2444                         dhcp_client->server_duid_len = option_len;
2445                 }
2446                 /* fall through */
2447         case INFORMATION_REQ:
2448         case REQUEST:
2449         case RENEW:
2450         case RELEASE:
2451         case CONFIRM:
2452         case DECLINE:
2453                 if (dhcp_client->type != G_DHCP_IPV6)
2454                         return TRUE;
2455
2456                 if (packet6->message != DHCPV6_REPLY)
2457                         return TRUE;
2458
2459                 count = 0;
2460                 option_len = 0;
2461                 server_id = dhcpv6_get_option(packet6, pkt_len,
2462                                 G_DHCPV6_SERVERID, &option_len, &count);
2463                 if (!server_id || count != 1 || option_len == 0 ||
2464                                 (dhcp_client->server_duid_len > 0 &&
2465                                 memcmp(dhcp_client->server_duid, server_id,
2466                                         dhcp_client->server_duid_len) != 0)) {
2467                         /* RFC 3315, 15.10 */
2468                         debug(dhcp_client,
2469                                 "server duid error, discarding msg %p/%d/%d",
2470                                 server_id, option_len, count);
2471                         return TRUE;
2472                 }
2473
2474                 switch_listening_mode(dhcp_client, L_NONE);
2475
2476                 get_dhcpv6_request(dhcp_client, packet6, pkt_len,
2477                                                 &dhcp_client->status_code);
2478
2479                 if (dhcp_client->information_req_cb) {
2480                         /*
2481                          * The dhcp_client might not be valid after the
2482                          * callback call so just return immediately.
2483                          */
2484                         dhcp_client->information_req_cb(dhcp_client,
2485                                         dhcp_client->information_req_data);
2486                         return TRUE;
2487                 }
2488                 if (dhcp_client->request_cb) {
2489                         dhcp_client->request_cb(dhcp_client,
2490                                         dhcp_client->request_data);
2491                         return TRUE;
2492                 }
2493                 if (dhcp_client->renew_cb) {
2494                         dhcp_client->renew_cb(dhcp_client,
2495                                         dhcp_client->renew_data);
2496                         return TRUE;
2497                 }
2498                 if (dhcp_client->rebind_cb) {
2499                         dhcp_client->rebind_cb(dhcp_client,
2500                                         dhcp_client->rebind_data);
2501                         return TRUE;
2502                 }
2503                 if (dhcp_client->release_cb) {
2504                         dhcp_client->release_cb(dhcp_client,
2505                                         dhcp_client->release_data);
2506                         return TRUE;
2507                 }
2508                 if (dhcp_client->decline_cb) {
2509                         dhcp_client->decline_cb(dhcp_client,
2510                                         dhcp_client->decline_data);
2511                         return TRUE;
2512                 }
2513                 if (dhcp_client->confirm_cb) {
2514                         count = 0;
2515                         server_id = dhcpv6_get_option(packet6, pkt_len,
2516                                                 G_DHCPV6_SERVERID, &option_len,
2517                                                 &count);
2518                         if (!server_id || count != 1 ||
2519                                                         option_len == 0) {
2520                                 /* RFC 3315, 15.10 */
2521                                 debug(dhcp_client,
2522                                         "confirm server duid error, "
2523                                         "discarding msg %p/%d/%d",
2524                                         server_id, option_len, count);
2525                                 return TRUE;
2526                         }
2527                         dhcp_client->server_duid = g_try_malloc(option_len);
2528                         if (!dhcp_client->server_duid)
2529                                 return TRUE;
2530                         memcpy(dhcp_client->server_duid, server_id, option_len);
2531                         dhcp_client->server_duid_len = option_len;
2532
2533                         dhcp_client->confirm_cb(dhcp_client,
2534                                                 dhcp_client->confirm_data);
2535                         return TRUE;
2536                 }
2537                 break;
2538         default:
2539                 break;
2540         }
2541
2542         debug(dhcp_client, "processed DHCP packet (new state %d)",
2543                                                         dhcp_client->state);
2544
2545         return TRUE;
2546 }
2547
2548 static gboolean discover_timeout(gpointer user_data)
2549 {
2550         GDHCPClient *dhcp_client = user_data;
2551
2552         dhcp_client->retry_times++;
2553
2554         /*
2555          * We do not send the REQUESTED IP option if we are retrying because
2556          * if the server is non-authoritative it will ignore the request if the
2557          * option is present.
2558          */
2559         g_dhcp_client_start(dhcp_client, NULL);
2560
2561         return FALSE;
2562 }
2563
2564 static gboolean reboot_timeout(gpointer user_data)
2565 {
2566         GDHCPClient *dhcp_client = user_data;
2567         dhcp_client->retry_times = 0;
2568         dhcp_client->requested_ip = 0;
2569         dhcp_client->state = INIT_SELECTING;
2570         /*
2571          * We do not send the REQUESTED IP option because the server didn't
2572          * respond when we send DHCPREQUEST with the REQUESTED IP option in
2573          * init-reboot state
2574          */
2575         g_dhcp_client_start(dhcp_client, NULL);
2576
2577         return FALSE;
2578 }
2579
2580 static gboolean ipv4ll_defend_timeout(gpointer dhcp_data)
2581 {
2582         GDHCPClient *dhcp_client = dhcp_data;
2583
2584         debug(dhcp_client, "back to MONITOR mode");
2585
2586         dhcp_client->conflicts = 0;
2587         dhcp_client->state = IPV4LL_MONITOR;
2588
2589         return FALSE;
2590 }
2591
2592 static gboolean ipv4ll_announce_timeout(gpointer dhcp_data)
2593 {
2594         GDHCPClient *dhcp_client = dhcp_data;
2595         uint32_t ip;
2596
2597         debug(dhcp_client, "request timeout (retries %d)",
2598                dhcp_client->retry_times);
2599
2600         if (dhcp_client->retry_times != ANNOUNCE_NUM) {
2601                 dhcp_client->retry_times++;
2602                 send_announce_packet(dhcp_client);
2603                 return FALSE;
2604         }
2605
2606         ip = htonl(dhcp_client->requested_ip);
2607         debug(dhcp_client, "switching to monitor mode");
2608         dhcp_client->state = IPV4LL_MONITOR;
2609         dhcp_client->assigned_ip = get_ip(ip);
2610
2611         if (dhcp_client->ipv4ll_available_cb)
2612                 dhcp_client->ipv4ll_available_cb(dhcp_client,
2613                                         dhcp_client->ipv4ll_available_data);
2614         dhcp_client->conflicts = 0;
2615
2616         return FALSE;
2617 }
2618
2619 static gboolean ipv4ll_probe_timeout(gpointer dhcp_data)
2620 {
2621
2622         GDHCPClient *dhcp_client = dhcp_data;
2623
2624         debug(dhcp_client, "IPV4LL probe timeout (retries %d)",
2625                dhcp_client->retry_times);
2626
2627         if (dhcp_client->retry_times == PROBE_NUM) {
2628                 dhcp_client->state = IPV4LL_ANNOUNCE;
2629                 dhcp_client->retry_times = 0;
2630
2631                 dhcp_client->retry_times++;
2632                 send_announce_packet(dhcp_client);
2633                 return FALSE;
2634         }
2635         dhcp_client->retry_times++;
2636         send_probe_packet(dhcp_client);
2637
2638         return FALSE;
2639 }
2640
2641 int g_dhcp_client_start(GDHCPClient *dhcp_client, const char *last_address)
2642 {
2643         int re;
2644         uint32_t addr;
2645
2646         if (dhcp_client->type == G_DHCP_IPV6) {
2647                 if (dhcp_client->information_req_cb) {
2648                         dhcp_client->state = INFORMATION_REQ;
2649                         re = switch_listening_mode(dhcp_client, L3);
2650                         if (re != 0) {
2651                                 switch_listening_mode(dhcp_client, L_NONE);
2652                                 dhcp_client->state = 0;
2653                                 return re;
2654                         }
2655                         send_information_req(dhcp_client);
2656
2657                 } else if (dhcp_client->solicitation_cb) {
2658                         dhcp_client->state = SOLICITATION;
2659                         re = switch_listening_mode(dhcp_client, L3);
2660                         if (re != 0) {
2661                                 switch_listening_mode(dhcp_client, L_NONE);
2662                                 dhcp_client->state = 0;
2663                                 return re;
2664                         }
2665                         send_solicitation(dhcp_client);
2666
2667                 } else if (dhcp_client->request_cb) {
2668                         dhcp_client->state = REQUEST;
2669                         re = switch_listening_mode(dhcp_client, L3);
2670                         if (re != 0) {
2671                                 switch_listening_mode(dhcp_client, L_NONE);
2672                                 dhcp_client->state = 0;
2673                                 return re;
2674                         }
2675                         send_dhcpv6_request(dhcp_client);
2676
2677                 } else if (dhcp_client->confirm_cb) {
2678                         dhcp_client->state = CONFIRM;
2679                         re = switch_listening_mode(dhcp_client, L3);
2680                         if (re != 0) {
2681                                 switch_listening_mode(dhcp_client, L_NONE);
2682                                 dhcp_client->state = 0;
2683                                 return re;
2684                         }
2685                         send_dhcpv6_confirm(dhcp_client);
2686
2687                 } else if (dhcp_client->renew_cb) {
2688                         dhcp_client->state = RENEW;
2689                         re = switch_listening_mode(dhcp_client, L3);
2690                         if (re != 0) {
2691                                 switch_listening_mode(dhcp_client, L_NONE);
2692                                 dhcp_client->state = 0;
2693                                 return re;
2694                         }
2695                         send_dhcpv6_renew(dhcp_client);
2696
2697                 } else if (dhcp_client->rebind_cb) {
2698                         dhcp_client->state = REBIND;
2699                         re = switch_listening_mode(dhcp_client, L3);
2700                         if (re != 0) {
2701                                 switch_listening_mode(dhcp_client, L_NONE);
2702                                 dhcp_client->state = 0;
2703                                 return re;
2704                         }
2705                         send_dhcpv6_rebind(dhcp_client);
2706
2707                 } else if (dhcp_client->release_cb) {
2708                         dhcp_client->state = RENEW;
2709                         re = switch_listening_mode(dhcp_client, L3);
2710                         if (re != 0) {
2711                                 switch_listening_mode(dhcp_client, L_NONE);
2712                                 dhcp_client->state = 0;
2713                                 return re;
2714                         }
2715                         send_dhcpv6_release(dhcp_client);
2716                 } else if (dhcp_client->decline_cb) {
2717                         dhcp_client->state = DECLINE;
2718                         re = switch_listening_mode(dhcp_client, L3);
2719                         if (re != 0) {
2720                                 switch_listening_mode(dhcp_client, L_NONE);
2721                                 dhcp_client->state = 0;
2722                                 return re;
2723                         }
2724                         send_dhcpv6_decline(dhcp_client);
2725                 }
2726
2727                 return 0;
2728         }
2729
2730         if (dhcp_client->type == G_DHCP_IPV4LL) {
2731                 dhcp_client->state = INIT_SELECTING;
2732                 ipv4ll_start(dhcp_client);
2733                 return 0;
2734         }
2735
2736         if (dhcp_client->retry_times == DISCOVER_RETRIES) {
2737                 if (dhcp_client->no_lease_cb)
2738                         dhcp_client->no_lease_cb(dhcp_client,
2739                                                 dhcp_client->no_lease_data);
2740                 dhcp_client->retry_times = 0;
2741                 return 0;
2742         }
2743
2744         if (dhcp_client->retry_times == 0) {
2745                 g_free(dhcp_client->assigned_ip);
2746                 dhcp_client->assigned_ip = NULL;
2747
2748                 dhcp_client->state = INIT_SELECTING;
2749                 re = switch_listening_mode(dhcp_client, L2);
2750                 if (re != 0)
2751                         return re;
2752
2753                 dhcp_client->xid = rand();
2754                 dhcp_client->start = time(NULL);
2755         }
2756
2757         if (!last_address) {
2758                 addr = 0;
2759         } else {
2760                 addr = ntohl(inet_addr(last_address));
2761                 if (addr == 0xFFFFFFFF) {
2762                         addr = 0;
2763                 } else {
2764                         g_free(dhcp_client->last_address);
2765                         dhcp_client->last_address = g_strdup(last_address);
2766                 }
2767         }
2768
2769         if ((addr != 0) && (dhcp_client->type != G_DHCP_IPV4LL)) {
2770                 debug(dhcp_client, "DHCP client start with state init_reboot");
2771                 dhcp_client->requested_ip = addr;
2772                 dhcp_client->state = REBOOTING;
2773                 send_request(dhcp_client);
2774
2775                 dhcp_client->timeout = g_timeout_add_seconds_full(
2776                                                                 G_PRIORITY_HIGH,
2777                                                                 REQUEST_TIMEOUT,
2778                                                                 reboot_timeout,
2779                                                                 dhcp_client,
2780                                                                 NULL);
2781                 return 0;
2782         }
2783         send_discover(dhcp_client, addr);
2784
2785         dhcp_client->timeout = g_timeout_add_seconds_full(G_PRIORITY_HIGH,
2786                                                         DISCOVER_TIMEOUT,
2787                                                         discover_timeout,
2788                                                         dhcp_client,
2789                                                         NULL);
2790         return 0;
2791 }
2792
2793 void g_dhcp_client_stop(GDHCPClient *dhcp_client)
2794 {
2795         switch_listening_mode(dhcp_client, L_NONE);
2796
2797         if (dhcp_client->state == BOUND ||
2798                         dhcp_client->state == RENEWING ||
2799                                 dhcp_client->state == REBINDING)
2800                 send_release(dhcp_client, dhcp_client->server_ip,
2801                                         dhcp_client->requested_ip);
2802
2803         remove_timeouts(dhcp_client);
2804
2805         if (dhcp_client->listener_watch > 0) {
2806                 g_source_remove(dhcp_client->listener_watch);
2807                 dhcp_client->listener_watch = 0;
2808         }
2809
2810         dhcp_client->retry_times = 0;
2811         dhcp_client->ack_retry_times = 0;
2812
2813         dhcp_client->requested_ip = 0;
2814         dhcp_client->state = RELEASED;
2815         dhcp_client->lease_seconds = 0;
2816         dhcp_client->request_bcast = false;
2817 }
2818
2819 GList *g_dhcp_client_get_option(GDHCPClient *dhcp_client,
2820                                         unsigned char option_code)
2821 {
2822         return g_hash_table_lookup(dhcp_client->code_value_hash,
2823                                         GINT_TO_POINTER((int) option_code));
2824 }
2825
2826 void g_dhcp_client_register_event(GDHCPClient *dhcp_client,
2827                                         GDHCPClientEvent event,
2828                                         GDHCPClientEventFunc func,
2829                                                         gpointer data)
2830 {
2831         switch (event) {
2832         case G_DHCP_CLIENT_EVENT_LEASE_AVAILABLE:
2833                 dhcp_client->lease_available_cb = func;
2834                 dhcp_client->lease_available_data = data;
2835                 return;
2836         case G_DHCP_CLIENT_EVENT_IPV4LL_AVAILABLE:
2837                 if (dhcp_client->type == G_DHCP_IPV6)
2838                         return;
2839                 dhcp_client->ipv4ll_available_cb = func;
2840                 dhcp_client->ipv4ll_available_data = data;
2841                 return;
2842         case G_DHCP_CLIENT_EVENT_NO_LEASE:
2843                 dhcp_client->no_lease_cb = func;
2844                 dhcp_client->no_lease_data = data;
2845                 return;
2846         case G_DHCP_CLIENT_EVENT_LEASE_LOST:
2847                 dhcp_client->lease_lost_cb = func;
2848                 dhcp_client->lease_lost_data = data;
2849                 return;
2850         case G_DHCP_CLIENT_EVENT_IPV4LL_LOST:
2851                 if (dhcp_client->type == G_DHCP_IPV6)
2852                         return;
2853                 dhcp_client->ipv4ll_lost_cb = func;
2854                 dhcp_client->ipv4ll_lost_data = data;
2855                 return;
2856         case G_DHCP_CLIENT_EVENT_ADDRESS_CONFLICT:
2857                 dhcp_client->address_conflict_cb = func;
2858                 dhcp_client->address_conflict_data = data;
2859                 return;
2860         case G_DHCP_CLIENT_EVENT_INFORMATION_REQ:
2861                 if (dhcp_client->type != G_DHCP_IPV6)
2862                         return;
2863                 dhcp_client->information_req_cb = func;
2864                 dhcp_client->information_req_data = data;
2865                 return;
2866         case G_DHCP_CLIENT_EVENT_SOLICITATION:
2867                 if (dhcp_client->type != G_DHCP_IPV6)
2868                         return;
2869                 dhcp_client->solicitation_cb = func;
2870                 dhcp_client->solicitation_data = data;
2871                 return;
2872         case G_DHCP_CLIENT_EVENT_ADVERTISE:
2873                 if (dhcp_client->type != G_DHCP_IPV6)
2874                         return;
2875                 dhcp_client->advertise_cb = func;
2876                 dhcp_client->advertise_data = data;
2877                 return;
2878         case G_DHCP_CLIENT_EVENT_REQUEST:
2879                 if (dhcp_client->type != G_DHCP_IPV6)
2880                         return;
2881                 dhcp_client->request_cb = func;
2882                 dhcp_client->request_data = data;
2883                 return;
2884         case G_DHCP_CLIENT_EVENT_RENEW:
2885                 if (dhcp_client->type != G_DHCP_IPV6)
2886                         return;
2887                 dhcp_client->renew_cb = func;
2888                 dhcp_client->renew_data = data;
2889                 return;
2890         case G_DHCP_CLIENT_EVENT_REBIND:
2891                 if (dhcp_client->type != G_DHCP_IPV6)
2892                         return;
2893                 dhcp_client->rebind_cb = func;
2894                 dhcp_client->rebind_data = data;
2895                 return;
2896         case G_DHCP_CLIENT_EVENT_RELEASE:
2897                 if (dhcp_client->type != G_DHCP_IPV6)
2898                         return;
2899                 dhcp_client->release_cb = func;
2900                 dhcp_client->release_data = data;
2901                 return;
2902         case G_DHCP_CLIENT_EVENT_CONFIRM:
2903                 if (dhcp_client->type != G_DHCP_IPV6)
2904                         return;
2905                 dhcp_client->confirm_cb = func;
2906                 dhcp_client->confirm_data = data;
2907                 return;
2908         case G_DHCP_CLIENT_EVENT_DECLINE:
2909                 if (dhcp_client->type != G_DHCP_IPV6)
2910                         return;
2911                 dhcp_client->decline_cb = func;
2912                 dhcp_client->decline_data = data;
2913                 return;
2914         }
2915 }
2916
2917 int g_dhcp_client_get_index(GDHCPClient *dhcp_client)
2918 {
2919         return dhcp_client->ifindex;
2920 }
2921
2922 char *g_dhcp_client_get_address(GDHCPClient *dhcp_client)
2923 {
2924         return g_strdup(dhcp_client->assigned_ip);
2925 }
2926
2927 char *g_dhcp_client_get_netmask(GDHCPClient *dhcp_client)
2928 {
2929         GList *option = NULL;
2930
2931         if (dhcp_client->type == G_DHCP_IPV6)
2932                 return NULL;
2933
2934         switch (dhcp_client->state) {
2935         case IPV4LL_DEFEND:
2936         case IPV4LL_MONITOR:
2937                 return g_strdup("255.255.0.0");
2938         case BOUND:
2939         case RENEWING:
2940         case REBINDING:
2941                 option = g_dhcp_client_get_option(dhcp_client, G_DHCP_SUBNET);
2942                 if (option)
2943                         return g_strdup(option->data);
2944         case INIT_SELECTING:
2945         case REBOOTING:
2946         case REQUESTING:
2947         case RELEASED:
2948         case IPV4LL_PROBE:
2949         case IPV4LL_ANNOUNCE:
2950         case INFORMATION_REQ:
2951         case SOLICITATION:
2952         case REQUEST:
2953         case CONFIRM:
2954         case RENEW:
2955         case REBIND:
2956         case RELEASE:
2957         case DECLINE:
2958                 break;
2959         }
2960         return NULL;
2961 }
2962
2963 GDHCPClientError g_dhcp_client_set_request(GDHCPClient *dhcp_client,
2964                                                 unsigned int option_code)
2965 {
2966         if (!g_list_find(dhcp_client->request_list,
2967                                 GINT_TO_POINTER((int)option_code)))
2968                 dhcp_client->request_list = g_list_prepend(
2969                                         dhcp_client->request_list,
2970                                         (GINT_TO_POINTER((int) option_code)));
2971
2972         return G_DHCP_CLIENT_ERROR_NONE;
2973 }
2974
2975 void g_dhcp_client_clear_requests(GDHCPClient *dhcp_client)
2976 {
2977         g_list_free(dhcp_client->request_list);
2978         dhcp_client->request_list = NULL;
2979 }
2980
2981 void g_dhcp_client_clear_values(GDHCPClient *dhcp_client)
2982 {
2983         g_hash_table_remove_all(dhcp_client->send_value_hash);
2984 }
2985
2986 static uint8_t *alloc_dhcp_option(int code, const uint8_t *data, unsigned size)
2987 {
2988         uint8_t *storage;
2989
2990         storage = g_try_malloc(size + OPT_DATA);
2991         if (!storage)
2992                 return NULL;
2993
2994         storage[OPT_CODE] = code;
2995         storage[OPT_LEN] = size;
2996         memcpy(&storage[OPT_DATA], data, size);
2997
2998         return storage;
2999 }
3000
3001 static uint8_t *alloc_dhcp_data_option(int code, const uint8_t *data,
3002                                         unsigned size)
3003 {
3004         return alloc_dhcp_option(code, data, MIN(size, 255));
3005 }
3006
3007 static uint8_t *alloc_dhcp_string_option(int code, const char *str)
3008 {
3009         return alloc_dhcp_data_option(code, (const uint8_t *)str, strlen(str));
3010 }
3011
3012 GDHCPClientError g_dhcp_client_set_id(GDHCPClient *dhcp_client)
3013 {
3014         const unsigned maclen = 6;
3015         const unsigned idlen = maclen + 1;
3016         const uint8_t option_code = G_DHCP_CLIENT_ID;
3017         uint8_t idbuf[idlen];
3018         uint8_t *data_option;
3019
3020         idbuf[0] = ARPHRD_ETHER;
3021
3022         memcpy(&idbuf[1], dhcp_client->mac_address, maclen);
3023
3024         data_option = alloc_dhcp_data_option(option_code, idbuf, idlen);
3025         if (!data_option)
3026                 return G_DHCP_CLIENT_ERROR_NOMEM;
3027
3028         g_hash_table_insert(dhcp_client->send_value_hash,
3029                 GINT_TO_POINTER((int) option_code), data_option);
3030
3031         return G_DHCP_CLIENT_ERROR_NONE;
3032 }
3033
3034 /* Now only support send hostname */
3035 GDHCPClientError g_dhcp_client_set_send(GDHCPClient *dhcp_client,
3036                 unsigned char option_code, const char *option_value)
3037 {
3038         uint8_t *binary_option;
3039
3040         if (option_code == G_DHCP_HOST_NAME && option_value) {
3041                 binary_option = alloc_dhcp_string_option(option_code,
3042                                                         option_value);
3043                 if (!binary_option)
3044                         return G_DHCP_CLIENT_ERROR_NOMEM;
3045
3046                 g_hash_table_insert(dhcp_client->send_value_hash,
3047                         GINT_TO_POINTER((int) option_code), binary_option);
3048         }
3049
3050         return G_DHCP_CLIENT_ERROR_NONE;
3051 }
3052
3053 static uint8_t *alloc_dhcpv6_option(uint16_t code, uint8_t *option,
3054                                 uint16_t len)
3055 {
3056         uint8_t *storage;
3057
3058         storage = g_malloc(2 + 2 + len);
3059         if (!storage)
3060                 return NULL;
3061
3062         storage[0] = code >> 8;
3063         storage[1] = code & 0xff;
3064         storage[2] = len >> 8;
3065         storage[3] = len & 0xff;
3066         memcpy(storage + 2 + 2, option, len);
3067
3068         return storage;
3069 }
3070
3071 gboolean g_dhcpv6_client_clear_send(GDHCPClient *dhcp_client, uint16_t code)
3072 {
3073         return g_hash_table_remove(dhcp_client->send_value_hash,
3074                                 GINT_TO_POINTER((int)code));
3075 }
3076
3077 void g_dhcpv6_client_set_send(GDHCPClient *dhcp_client,
3078                                         uint16_t option_code,
3079                                         uint8_t *option_value,
3080                                         uint16_t option_len)
3081 {
3082         if (option_value) {
3083                 uint8_t *binary_option;
3084
3085                 debug(dhcp_client, "setting option %d to %p len %d",
3086                         option_code, option_value, option_len);
3087
3088                 binary_option = alloc_dhcpv6_option(option_code, option_value,
3089                                                 option_len);
3090                 if (binary_option)
3091                         g_hash_table_insert(dhcp_client->send_value_hash,
3092                                         GINT_TO_POINTER((int) option_code),
3093                                         binary_option);
3094         }
3095 }
3096
3097 void g_dhcpv6_client_reset_request(GDHCPClient *dhcp_client)
3098 {
3099         if (!dhcp_client || dhcp_client->type != G_DHCP_IPV6)
3100                 return;
3101
3102         dhcp_client->last_request = time(NULL);
3103 }
3104
3105 uint16_t g_dhcpv6_client_get_status(GDHCPClient *dhcp_client)
3106 {
3107         if (!dhcp_client || dhcp_client->type != G_DHCP_IPV6)
3108                 return 0;
3109
3110         return dhcp_client->status_code;
3111 }
3112
3113 GDHCPClient *g_dhcp_client_ref(GDHCPClient *dhcp_client)
3114 {
3115         if (!dhcp_client)
3116                 return NULL;
3117
3118         __sync_fetch_and_add(&dhcp_client->ref_count, 1);
3119
3120         return dhcp_client;
3121 }
3122
3123 void g_dhcp_client_unref(GDHCPClient *dhcp_client)
3124 {
3125         if (!dhcp_client)
3126                 return;
3127
3128         if (__sync_fetch_and_sub(&dhcp_client->ref_count, 1) != 1)
3129                 return;
3130
3131         g_dhcp_client_stop(dhcp_client);
3132
3133         g_free(dhcp_client->interface);
3134         g_free(dhcp_client->assigned_ip);
3135         g_free(dhcp_client->last_address);
3136         g_free(dhcp_client->duid);
3137         g_free(dhcp_client->server_duid);
3138
3139         g_list_free(dhcp_client->request_list);
3140         g_list_free(dhcp_client->require_list);
3141
3142         g_hash_table_destroy(dhcp_client->code_value_hash);
3143         g_hash_table_destroy(dhcp_client->send_value_hash);
3144
3145         g_free(dhcp_client);
3146 }
3147
3148 void g_dhcp_client_set_debug(GDHCPClient *dhcp_client,
3149                                 GDHCPDebugFunc func, gpointer user_data)
3150 {
3151         if (!dhcp_client)
3152                 return;
3153
3154         dhcp_client->debug_func = func;
3155         dhcp_client->debug_data = user_data;
3156 }
3157
3158 static GDHCPIAPrefix *copy_prefix(gpointer data)
3159 {
3160         GDHCPIAPrefix *copy, *prefix = data;
3161
3162         copy = g_try_new(GDHCPIAPrefix, 1);
3163         if (!copy)
3164                 return NULL;
3165
3166         memcpy(copy, prefix, sizeof(GDHCPIAPrefix));
3167
3168         return copy;
3169 }
3170
3171 GSList *g_dhcpv6_copy_prefixes(GSList *prefixes)
3172 {
3173         GSList *copy = NULL;
3174         GSList *list;
3175
3176         for (list = prefixes; list; list = list->next)
3177                 copy = g_slist_prepend(copy, copy_prefix(list->data));
3178
3179         return copy;
3180 }