src/p2p/p2p_parse.c

   1 /*
   2  * P2P - IE parser
   3  * Copyright (c) 2009-2010, Atheros Communications
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * Alternatively, this software may be distributed under the terms of BSD
  10  * license.
  11  *
  12  * See README and COPYING for more details.
  13  */
  14
  15 #include "includes.h"
  16
  17 #include "common.h"
  18 #include "common/ieee802_11_defs.h"
  19 #include "common/ieee802_11_common.h"
  20 #include "wps/wps_i.h"
  21 #include "p2p_i.h"
  22
  23
  24 static int p2p_parse_attribute(u8 id, const u8 *data, u16 len,
  25                                struct p2p_message *msg)
  26 {
  27         const u8 *pos;
  28         size_t i, nlen;
  29         char devtype[WPS_DEV_TYPE_BUFSIZE];
  30
  31         switch (id) {
  32         case P2P_ATTR_CAPABILITY:
  33                 if (len < 2) {
  34                         wpa_printf(MSG_DEBUG, "P2P: Too short Capability "
  35                                    "attribute (length %d)", len);
  36                         return -1;
  37                 }
  38                 msg->capability = data;
  39                 wpa_printf(MSG_DEBUG, "P2P: * Device Capability %02x "
  40                            "Group Capability %02x",
  41                            data[0], data[1]);
  42                 break;
  43         case P2P_ATTR_DEVICE_ID:
  44                 if (len < ETH_ALEN) {
  45                         wpa_printf(MSG_DEBUG, "P2P: Too short Device ID "
  46                                    "attribute (length %d)", len);
  47                         return -1;
  48                 }
  49                 msg->device_id = data;
  50                 wpa_printf(MSG_DEBUG, "P2P: * Device ID " MACSTR,
  51                            MAC2STR(msg->device_id));
  52                 break;
  53         case P2P_ATTR_GROUP_OWNER_INTENT:
  54                 if (len < 1) {
  55                         wpa_printf(MSG_DEBUG, "P2P: Too short GO Intent "
  56                                    "attribute (length %d)", len);
  57                         return -1;
  58                 }
  59                 msg->go_intent = data;
  60                 wpa_printf(MSG_DEBUG, "P2P: * GO Intent: Intent %u "
  61                            "Tie breaker %u", data[0] >> 1, data[0] & 0x01);
  62                 break;
  63         case P2P_ATTR_STATUS:
  64                 if (len < 1) {
  65                         wpa_printf(MSG_DEBUG, "P2P: Too short Status "
  66                                    "attribute (length %d)", len);
  67                         return -1;
  68                 }
  69                 msg->status = data;
  70                 wpa_printf(MSG_DEBUG, "P2P: * Status: %d", data[0]);
  71                 break;
  72         case P2P_ATTR_LISTEN_CHANNEL:
  73                 if (len == 0) {
  74                         wpa_printf(MSG_DEBUG, "P2P: * Listen Channel: Ignore "
  75                                    "null channel");
  76                         break;
  77                 }
  78                 if (len < 5) {
  79                         wpa_printf(MSG_DEBUG, "P2P: Too short Listen Channel "
  80                                    "attribute (length %d)", len);
  81                         return -1;
  82                 }
  83                 msg->listen_channel = data;
  84                 wpa_printf(MSG_DEBUG, "P2P: * Listen Channel: "
  85                            "Country %c%c(0x%02x) Regulatory "
  86                            "Class %d Channel Number %d", data[0], data[1],
  87                            data[2], data[3], data[4]);
  88                 break;
  89         case P2P_ATTR_OPERATING_CHANNEL:
  90                 if (len == 0) {
  91                         wpa_printf(MSG_DEBUG, "P2P: * Operating Channel: "
  92                                    "Ignore null channel");
  93                         break;
  94                 }
  95                 if (len < 5) {
  96                         wpa_printf(MSG_DEBUG, "P2P: Too short Operating "
  97                                    "Channel attribute (length %d)", len);
  98                         return -1;
  99                 }
 100                 msg->operating_channel = data;
 101                 wpa_printf(MSG_DEBUG, "P2P: * Operating Channel: "
 102                            "Country %c%c(0x%02x) Regulatory "
 103                            "Class %d Channel Number %d", data[0], data[1],
 104                            data[2], data[3], data[4]);
 105                 break;
 106         case P2P_ATTR_CHANNEL_LIST:
 107                 if (len < 3) {
 108                         wpa_printf(MSG_DEBUG, "P2P: Too short Channel List "
 109                                    "attribute (length %d)", len);
 110                         return -1;
 111                 }
 112                 msg->channel_list = data;
 113                 msg->channel_list_len = len;
 114                 wpa_printf(MSG_DEBUG, "P2P: * Channel List: Country String "
 115                            "'%c%c(0x%02x)'", data[0], data[1], data[2]);
 116                 wpa_hexdump(MSG_MSGDUMP, "P2P: Channel List",
 117                             msg->channel_list, msg->channel_list_len);
 118                 break;
 119         case P2P_ATTR_GROUP_INFO:
 120                 msg->group_info = data;
 121                 msg->group_info_len = len;
 122                 wpa_printf(MSG_DEBUG, "P2P: * Group Info");
 123                 break;
 124         case P2P_ATTR_DEVICE_INFO:
 125                 if (len < ETH_ALEN + 2 + 8 + 1) {
 126                         wpa_printf(MSG_DEBUG, "P2P: Too short Device Info "
 127                                    "attribute (length %d)", len);
 128                         return -1;
 129                 }
 130                 msg->p2p_device_info = data;
 131                 msg->p2p_device_info_len = len;
 132                 pos = data;
 133                 msg->p2p_device_addr = pos;
 134                 pos += ETH_ALEN;
 135                 msg->config_methods = WPA_GET_BE16(pos);
 136                 pos += 2;
 137                 msg->pri_dev_type = pos;
 138                 pos += 8;
 139                 msg->num_sec_dev_types = *pos++;
 140                 if (msg->num_sec_dev_types * 8 > data + len - pos) {
 141                         wpa_printf(MSG_DEBUG, "P2P: Device Info underflow");
 142                         return -1;
 143                 }
 144                 pos += msg->num_sec_dev_types * 8;
 145                 if (data + len - pos < 4) {
 146                         wpa_printf(MSG_DEBUG, "P2P: Invalid Device Name "
 147                                    "length %d", (int) (data + len - pos));
 148                         return -1;
 149                 }
 150                 if (WPA_GET_BE16(pos) != ATTR_DEV_NAME) {
 151                         wpa_hexdump(MSG_DEBUG, "P2P: Unexpected Device Name "
 152                                     "header", pos, 4);
 153                         return -1;
 154                 }
 155                 pos += 2;
 156                 nlen = WPA_GET_BE16(pos);
 157                 pos += 2;
 158                 if (data + len - pos < (int) nlen || nlen > 32) {
 159                         wpa_printf(MSG_DEBUG, "P2P: Invalid Device Name "
 160                                    "length %d (buf len %d)", (int) nlen,
 161                                    (int) (data + len - pos));
 162                         return -1;
 163                 }
 164                 os_memcpy(msg->device_name, pos, nlen);
 165                 for (i = 0; i < nlen; i++) {
 166                         if (msg->device_name[i] == '\0')
 167                                 break;
 168                         if (msg->device_name[i] < 32)
 169                                 msg->device_name[i] = '_';
 170                 }
 171                 wpa_printf(MSG_DEBUG, "P2P: * Device Info: addr " MACSTR
 172                            " primary device type %s device name '%s' "
 173                            "config methods 0x%x",
 174                            MAC2STR(msg->p2p_device_addr),
 175                            wps_dev_type_bin2str(msg->pri_dev_type, devtype,
 176                                                 sizeof(devtype)),
 177                            msg->device_name, msg->config_methods);
 178                 break;
 179         case P2P_ATTR_CONFIGURATION_TIMEOUT:
 180                 if (len < 2) {
 181                         wpa_printf(MSG_DEBUG, "P2P: Too short Configuration "
 182                                    "Timeout attribute (length %d)", len);
 183                         return -1;
 184                 }
 185                 msg->config_timeout = data;
 186                 wpa_printf(MSG_DEBUG, "P2P: * Configuration Timeout");
 187                 break;
 188         case P2P_ATTR_INTENDED_INTERFACE_ADDR:
 189                 if (len < ETH_ALEN) {
 190                         wpa_printf(MSG_DEBUG, "P2P: Too short Intended P2P "
 191                                    "Interface Address attribute (length %d)",
 192                                    len);
 193                         return -1;
 194                 }
 195                 msg->intended_addr = data;
 196                 wpa_printf(MSG_DEBUG, "P2P: * Intended P2P Interface Address: "
 197                            MACSTR, MAC2STR(msg->intended_addr));
 198                 break;
 199         case P2P_ATTR_GROUP_BSSID:
 200                 if (len < ETH_ALEN) {
 201                         wpa_printf(MSG_DEBUG, "P2P: Too short P2P Group BSSID "
 202                                    "attribute (length %d)", len);
 203                         return -1;
 204                 }
 205                 msg->group_bssid = data;
 206                 wpa_printf(MSG_DEBUG, "P2P: * P2P Group BSSID: " MACSTR,
 207                            MAC2STR(msg->group_bssid));
 208                 break;
 209         case P2P_ATTR_GROUP_ID:
 210                 if (len < ETH_ALEN || len > ETH_ALEN + 32) {
 211                         wpa_printf(MSG_DEBUG, "P2P: Invalid P2P Group ID "
 212                                    "attribute length %d", len);
 213                         return -1;
 214                 }
 215                 msg->group_id = data;
 216                 msg->group_id_len = len;
 217                 wpa_printf(MSG_DEBUG, "P2P: * P2P Group ID: Device Address "
 218                            MACSTR, MAC2STR(msg->group_id));
 219                 wpa_hexdump_ascii(MSG_DEBUG, "P2P: * P2P Group ID: SSID",
 220                                   msg->group_id + ETH_ALEN,
 221                                   msg->group_id_len - ETH_ALEN);
 222                 break;
 223         case P2P_ATTR_INVITATION_FLAGS:
 224                 if (len < 1) {
 225                         wpa_printf(MSG_DEBUG, "P2P: Too short Invitation "
 226                                    "Flag attribute (length %d)", len);
 227                         return -1;
 228                 }
 229                 msg->invitation_flags = data;
 230                 wpa_printf(MSG_DEBUG, "P2P: * Invitation Flags: bitmap 0x%x",
 231                            data[0]);
 232                 break;
 233         case P2P_ATTR_MANAGEABILITY:
 234                 if (len < 1) {
 235                         wpa_printf(MSG_DEBUG, "P2P: Too short Manageability "
 236                                    "attribute (length %d)", len);
 237                         return -1;
 238                 }
 239                 msg->manageability = data;
 240                 wpa_printf(MSG_DEBUG, "P2P: * Manageability: bitmap 0x%x",
 241                            data[0]);
 242                 break;
 243         case P2P_ATTR_NOTICE_OF_ABSENCE:
 244                 if (len < 2) {
 245                         wpa_printf(MSG_DEBUG, "P2P: Too short Notice of "
 246                                    "Absence attribute (length %d)", len);
 247                         return -1;
 248                 }
 249                 msg->noa = data;
 250                 msg->noa_len = len;
 251                 wpa_printf(MSG_DEBUG, "P2P: * Notice of Absence");
 252                 break;
 253         case P2P_ATTR_EXT_LISTEN_TIMING:
 254                 if (len < 4) {
 255                         wpa_printf(MSG_DEBUG, "P2P: Too short Extended Listen "
 256                                    "Timing attribute (length %d)", len);
 257                         return -1;
 258                 }
 259                 msg->ext_listen_timing = data;
 260                 wpa_printf(MSG_DEBUG, "P2P: * Extended Listen Timing "
 261                            "(period %u msec  interval %u msec)",
 262                            WPA_GET_LE16(msg->ext_listen_timing),
 263                            WPA_GET_LE16(msg->ext_listen_timing + 2));
 264                 break;
 265         case P2P_ATTR_MINOR_REASON_CODE:
 266                 if (len < 1) {
 267                         wpa_printf(MSG_DEBUG, "P2P: Too short Minor Reason "
 268                                    "Code attribute (length %d)", len);
 269                         return -1;
 270                 }
 271                 msg->minor_reason_code = data;
 272                 wpa_printf(MSG_DEBUG, "P2P: * Minor Reason Code: %u",
 273                            *msg->minor_reason_code);
 274                 break;
 275         default:
 276                 wpa_printf(MSG_DEBUG, "P2P: Skipped unknown attribute %d "
 277                            "(length %d)", id, len);
 278                 break;
 279         }
 280
 281         return 0;
 282 }
 283
 284
 285 /**
 286  * p2p_parse_p2p_ie - Parse P2P IE
 287  * @buf: Concatenated P2P IE(s) payload
 288  * @msg: Buffer for returning parsed attributes
 289  * Returns: 0 on success, -1 on failure
 290  *
 291  * Note: Caller is responsible for clearing the msg data structure before
 292  * calling this function.
 293  */
 294 int p2p_parse_p2p_ie(const struct wpabuf *buf, struct p2p_message *msg)
 295 {
 296         const u8 *pos = wpabuf_head_u8(buf);
 297         const u8 *end = pos + wpabuf_len(buf);
 298
 299         wpa_printf(MSG_DEBUG, "P2P: Parsing P2P IE");
 300
 301         while (pos < end) {
 302                 u16 attr_len;
 303                 if (pos + 2 >= end) {
 304                         wpa_printf(MSG_DEBUG, "P2P: Invalid P2P attribute");
 305                         return -1;
 306                 }
 307                 attr_len = WPA_GET_LE16(pos + 1);
 308                 wpa_printf(MSG_DEBUG, "P2P: Attribute %d length %u",
 309                            pos[0], attr_len);
 310                 if (pos + 3 + attr_len > end) {
 311                         wpa_printf(MSG_DEBUG, "P2P: Attribute underflow "
 312                                    "(len=%u left=%d)",
 313                                    attr_len, (int) (end - pos - 3));
 314                         wpa_hexdump(MSG_MSGDUMP, "P2P: Data", pos, end - pos);
 315                         return -1;
 316                 }
 317                 if (p2p_parse_attribute(pos[0], pos + 3, attr_len, msg))
 318                         return -1;
 319                 pos += 3 + attr_len;
 320         }
 321
 322         return 0;
 323 }
 324
 325
 326 static int p2p_parse_wps_ie(const struct wpabuf *buf, struct p2p_message *msg)
 327 {
 328         struct wps_parse_attr attr;
 329
 330         wpa_printf(MSG_DEBUG, "P2P: Parsing WPS IE");
 331         if (wps_parse_msg(buf, &attr))
 332                 return -1;
 333         if (attr.dev_name && attr.dev_name_len < sizeof(msg->device_name) &&
 334             !msg->device_name[0])
 335                 os_memcpy(msg->device_name, attr.dev_name, attr.dev_name_len);
 336         if (attr.config_methods) {
 337                 msg->wps_config_methods =
 338                         WPA_GET_BE16(attr.config_methods);
 339                 wpa_printf(MSG_DEBUG, "P2P: Config Methods (WPS): 0x%x",
 340                            msg->wps_config_methods);
 341         }
 342         if (attr.dev_password_id) {
 343                 msg->dev_password_id = WPA_GET_BE16(attr.dev_password_id);
 344                 wpa_printf(MSG_DEBUG, "P2P: Device Password ID: %d",
 345                            msg->dev_password_id);
 346         }
 347         if (attr.primary_dev_type) {
 348                 char devtype[WPS_DEV_TYPE_BUFSIZE];
 349                 msg->wps_pri_dev_type = attr.primary_dev_type;
 350                 wpa_printf(MSG_DEBUG, "P2P: Primary Device Type (WPS): %s",
 351                            wps_dev_type_bin2str(msg->wps_pri_dev_type, devtype,
 352                                                 sizeof(devtype)));
 353         }
 354
 355         return 0;
 356 }
 357
 358
 359 /**
 360  * p2p_parse_ies - Parse P2P message IEs (both WPS and P2P IE)
 361  * @data: IEs from the message
 362  * @len: Length of data buffer in octets
 363  * @msg: Buffer for returning parsed attributes
 364  * Returns: 0 on success, -1 on failure
 365  *
 366  * Note: Caller is responsible for clearing the msg data structure before
 367  * calling this function.
 368  *
 369  * Note: Caller must free temporary memory allocations by calling
 370  * p2p_parse_free() when the parsed data is not needed anymore.
 371  */
 372 int p2p_parse_ies(const u8 *data, size_t len, struct p2p_message *msg)
 373 {
 374         struct ieee802_11_elems elems;
 375
 376         ieee802_11_parse_elems(data, len, &elems, 0);
 377         if (elems.ds_params && elems.ds_params_len >= 1)
 378                 msg->ds_params = elems.ds_params;
 379         if (elems.ssid)
 380                 msg->ssid = elems.ssid - 2;
 381
 382         msg->wps_attributes = ieee802_11_vendor_ie_concat(data, len,
 383                                                           WPS_DEV_OUI_WFA);
 384         if (msg->wps_attributes &&
 385             p2p_parse_wps_ie(msg->wps_attributes, msg)) {
 386                 p2p_parse_free(msg);
 387                 return -1;
 388         }
 389
 390         msg->p2p_attributes = ieee802_11_vendor_ie_concat(data, len,
 391                                                           P2P_IE_VENDOR_TYPE);
 392         if (msg->p2p_attributes &&
 393             p2p_parse_p2p_ie(msg->p2p_attributes, msg)) {
 394                 wpa_printf(MSG_DEBUG, "P2P: Failed to parse P2P IE data");
 395                 if (msg->p2p_attributes)
 396                         wpa_hexdump_buf(MSG_MSGDUMP, "P2P: P2P IE data",
 397                                         msg->p2p_attributes);
 398                 p2p_parse_free(msg);
 399                 return -1;
 400         }
 401
 402         return 0;
 403 }
 404
 405
 406 /**
 407  * p2p_parse - Parse a P2P Action frame contents
 408  * @data: Action frame payload after Category and Code fields
 409  * @len: Length of data buffer in octets
 410  * @msg: Buffer for returning parsed attributes
 411  * Returns: 0 on success, -1 on failure
 412  *
 413  * Note: Caller must free temporary memory allocations by calling
 414  * p2p_parse_free() when the parsed data is not needed anymore.
 415  */
 416 int p2p_parse(const u8 *data, size_t len, struct p2p_message *msg)
 417 {
 418         os_memset(msg, 0, sizeof(*msg));
 419         wpa_printf(MSG_DEBUG, "P2P: Parsing the received message");
 420         if (len < 1) {
 421                 wpa_printf(MSG_DEBUG, "P2P: No Dialog Token in the message");
 422                 return -1;
 423         }
 424         msg->dialog_token = data[0];
 425         wpa_printf(MSG_DEBUG, "P2P: * Dialog Token: %d", msg->dialog_token);
 426
 427         return p2p_parse_ies(data + 1, len - 1, msg);
 428 }
 429
 430
 431 /**
 432  * p2p_parse_free - Free temporary data from P2P parsing
 433  * @msg: Parsed attributes
 434  */
 435 void p2p_parse_free(struct p2p_message *msg)
 436 {
 437         wpabuf_free(msg->p2p_attributes);
 438         msg->p2p_attributes = NULL;
 439         wpabuf_free(msg->wps_attributes);
 440         msg->wps_attributes = NULL;
 441 }
 442
 443
 444 int p2p_group_info_parse(const u8 *gi, size_t gi_len,
 445                          struct p2p_group_info *info)
 446 {
 447         const u8 *g, *gend;
 448
 449         os_memset(info, 0, sizeof(*info));
 450         if (gi == NULL)
 451                 return 0;
 452
 453         g = gi;
 454         gend = gi + gi_len;
 455         while (g < gend) {
 456                 struct p2p_client_info *cli;
 457                 const u8 *t, *cend;
 458                 int count;
 459
 460                 cli = &info->client[info->num_clients];
 461                 cend = g + 1 + g[0];
 462                 if (cend > gend)
 463                         return -1; /* invalid data */
 464                 /* g at start of P2P Client Info Descriptor */
 465                 /* t at Device Capability Bitmap */
 466                 t = g + 1 + 2 * ETH_ALEN;
 467                 if (t > cend)
 468                         return -1; /* invalid data */
 469                 cli->p2p_device_addr = g + 1;
 470                 cli->p2p_interface_addr = g + 1 + ETH_ALEN;
 471                 cli->dev_capab = t[0];
 472
 473                 if (t + 1 + 2 + 8 + 1 > cend)
 474                         return -1; /* invalid data */
 475
 476                 cli->config_methods = WPA_GET_BE16(&t[1]);
 477                 cli->pri_dev_type = &t[3];
 478
 479                 t += 1 + 2 + 8;
 480                 /* t at Number of Secondary Device Types */
 481                 cli->num_sec_dev_types = *t++;
 482                 if (t + 8 * cli->num_sec_dev_types > cend)
 483                         return -1; /* invalid data */
 484                 cli->sec_dev_types = t;
 485                 t += 8 * cli->num_sec_dev_types;
 486
 487                 /* t at Device Name in WPS TLV format */
 488                 if (t + 2 + 2 > cend)
 489                         return -1; /* invalid data */
 490                 if (WPA_GET_BE16(t) != ATTR_DEV_NAME)
 491                         return -1; /* invalid Device Name TLV */
 492                 t += 2;
 493                 count = WPA_GET_BE16(t);
 494                 t += 2;
 495                 if (count > cend - t)
 496                         return -1; /* invalid Device Name TLV */
 497                 if (count >= 32)
 498                         count = 32;
 499                 cli->dev_name = (const char *) t;
 500                 cli->dev_name_len = count;
 501
 502                 g = cend;
 503
 504                 info->num_clients++;
 505                 if (info->num_clients == P2P_MAX_GROUP_ENTRIES)
 506                         return -1;
 507         }
 508
 509         return 0;
 510 }
 511
 512
 513 static int p2p_group_info_text(const u8 *gi, size_t gi_len, char *buf,
 514                                char *end)
 515 {
 516         char *pos = buf;
 517         int ret;
 518         struct p2p_group_info info;
 519         unsigned int i;
 520
 521         if (p2p_group_info_parse(gi, gi_len, &info) < 0)
 522                 return 0;
 523
 524         for (i = 0; i < info.num_clients; i++) {
 525                 struct p2p_client_info *cli;
 526                 char name[33];
 527                 char devtype[WPS_DEV_TYPE_BUFSIZE];
 528                 u8 s;
 529                 int count;
 530
 531                 cli = &info.client[i];
 532                 ret = os_snprintf(pos, end - pos, "p2p_group_client: "
 533                                   "dev=" MACSTR " iface=" MACSTR,
 534                                   MAC2STR(cli->p2p_device_addr),
 535                                   MAC2STR(cli->p2p_interface_addr));
 536                 if (ret < 0 || ret >= end - pos)
 537                         return pos - buf;
 538                 pos += ret;
 539
 540                 ret = os_snprintf(pos, end - pos,
 541                                   " dev_capab=0x%x config_methods=0x%x "
 542                                   "dev_type=%s",
 543                                   cli->dev_capab, cli->config_methods,
 544                                   wps_dev_type_bin2str(cli->pri_dev_type,
 545                                                        devtype,
 546                                                        sizeof(devtype)));
 547                 if (ret < 0 || ret >= end - pos)
 548                         return pos - buf;
 549                 pos += ret;
 550
 551                 for (s = 0; s < cli->num_sec_dev_types; s++) {
 552                         ret = os_snprintf(pos, end - pos, " dev_type=%s",
 553                                           wps_dev_type_bin2str(
 554                                                   &cli->sec_dev_types[s * 8],
 555                                                   devtype, sizeof(devtype)));
 556                         if (ret < 0 || ret >= end - pos)
 557                                 return pos - buf;
 558                         pos += ret;
 559                 }
 560
 561                 os_memcpy(name, cli->dev_name, cli->dev_name_len);
 562                 name[cli->dev_name_len] = '\0';
 563                 count = (int) cli->dev_name_len - 1;
 564                 while (count >= 0) {
 565                         if (name[count] < 32)
 566                                 name[count] = '_';
 567                         count--;
 568                 }
 569
 570                 ret = os_snprintf(pos, end - pos, " dev_name='%s'\n", name);
 571                 if (ret < 0 || ret >= end - pos)
 572                         return pos - buf;
 573                 pos += ret;
 574         }
 575
 576         return pos - buf;
 577 }
 578
 579
 580 /**
 581  * p2p_attr_text - Build text format description of P2P IE attributes
 582  * @data: P2P IE contents
 583  * @buf: Buffer for returning text
 584  * @end: Pointer to the end of the buf area
 585  * Returns: Number of octets written to the buffer or -1 on faikure
 586  *
 587  * This function can be used to parse P2P IE contents into text format
 588  * field=value lines.
 589  */
 590 int p2p_attr_text(struct wpabuf *data, char *buf, char *end)
 591 {
 592         struct p2p_message msg;
 593         char *pos = buf;
 594         int ret;
 595
 596         os_memset(&msg, 0, sizeof(msg));
 597         if (p2p_parse_p2p_ie(data, &msg))
 598                 return -1;
 599
 600         if (msg.capability) {
 601                 ret = os_snprintf(pos, end - pos,
 602                                   "p2p_dev_capab=0x%x\n"
 603                                   "p2p_group_capab=0x%x\n",
 604                                   msg.capability[0], msg.capability[1]);
 605                 if (ret < 0 || ret >= end - pos)
 606                         return pos - buf;
 607                 pos += ret;
 608         }
 609
 610         if (msg.pri_dev_type) {
 611                 char devtype[WPS_DEV_TYPE_BUFSIZE];
 612                 ret = os_snprintf(pos, end - pos,
 613                                   "p2p_primary_device_type=%s\n",
 614                                   wps_dev_type_bin2str(msg.pri_dev_type,
 615                                                        devtype,
 616                                                        sizeof(devtype)));
 617                 if (ret < 0 || ret >= end - pos)
 618                         return pos - buf;
 619                 pos += ret;
 620         }
 621
 622         ret = os_snprintf(pos, end - pos, "p2p_device_name=%s\n",
 623                           msg.device_name);
 624         if (ret < 0 || ret >= end - pos)
 625                 return pos - buf;
 626         pos += ret;
 627
 628         if (msg.p2p_device_addr) {
 629                 ret = os_snprintf(pos, end - pos, "p2p_device_addr=" MACSTR
 630                                   "\n",
 631                                   MAC2STR(msg.p2p_device_addr));
 632                 if (ret < 0 || ret >= end - pos)
 633                         return pos - buf;
 634                 pos += ret;
 635         }
 636
 637         ret = os_snprintf(pos, end - pos, "p2p_config_methods=0x%x\n",
 638                           msg.config_methods);
 639         if (ret < 0 || ret >= end - pos)
 640                 return pos - buf;
 641         pos += ret;
 642
 643         ret = p2p_group_info_text(msg.group_info, msg.group_info_len,
 644                                   pos, end);
 645         if (ret < 0)
 646                 return pos - buf;
 647         pos += ret;
 648
 649         return pos - buf;
 650 }
 651
 652
 653 u8 p2p_get_group_capab(const struct wpabuf *p2p_ie)
 654 {
 655         struct p2p_message msg;
 656
 657         os_memset(&msg, 0, sizeof(msg));
 658         if (p2p_parse_p2p_ie(p2p_ie, &msg))
 659                 return 0;
 660
 661         if (!msg.capability)
 662                 return 0;
 663
 664         return msg.capability[1];
 665 }
 666
 667
 668 const u8 * p2p_get_go_dev_addr(const struct wpabuf *p2p_ie)
 669 {
 670         struct p2p_message msg;
 671
 672         os_memset(&msg, 0, sizeof(msg));
 673         if (p2p_parse_p2p_ie(p2p_ie, &msg))
 674                 return NULL;
 675
 676         if (msg.p2p_device_addr)
 677                 return msg.p2p_device_addr;
 678         if (msg.device_id)
 679                 return msg.device_id;
 680
 681         return NULL;
 682 }