wpa_supplicant/config_file.c

   1 /*
   2  * WPA Supplicant / Configuration backend: text file
   3  * Copyright (c) 2003-2008, Jouni Malinen <j@w1.fi>
   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  * This file implements a configuration backend for text files. All the
  15  * configuration information is stored in a text file that uses a format
  16  * described in the sample configuration file, wpa_supplicant.conf.
  17  */
  18
  19 #include "includes.h"
  20
  21 #include "common.h"
  22 #include "config.h"
  23 #include "base64.h"
  24 #include "uuid.h"
  25 #include "eap_peer/eap_methods.h"
  26
  27
  28 /**
  29  * wpa_config_get_line - Read the next configuration file line
  30  * @s: Buffer for the line
  31  * @size: The buffer length
  32  * @stream: File stream to read from
  33  * @line: Pointer to a variable storing the file line number
  34  * @_pos: Buffer for the pointer to the beginning of data on the text line or
  35  * %NULL if not needed (returned value used instead)
  36  * Returns: Pointer to the beginning of data on the text line or %NULL if no
  37  * more text lines are available.
  38  *
  39  * This function reads the next non-empty line from the configuration file and
  40  * removes comments. The returned string is guaranteed to be null-terminated.
  41  */
  42 static char * wpa_config_get_line(char *s, int size, FILE *stream, int *line,
  43                                   char **_pos)
  44 {
  45         char *pos, *end, *sstart;
  46
  47         while (fgets(s, size, stream)) {
  48                 (*line)++;
  49                 s[size - 1] = '\0';
  50                 pos = s;
  51
  52                 /* Skip white space from the beginning of line. */
  53                 while (*pos == ' ' || *pos == '\t' || *pos == '\r')
  54                         pos++;
  55
  56                 /* Skip comment lines and empty lines */
  57                 if (*pos == '#' || *pos == '\n' || *pos == '\0')
  58                         continue;
  59
  60                 /*
  61                  * Remove # comments unless they are within a double quoted
  62                  * string.
  63                  */
  64                 sstart = os_strchr(pos, '"');
  65                 if (sstart)
  66                         sstart = os_strrchr(sstart + 1, '"');
  67                 if (!sstart)
  68                         sstart = pos;
  69                 end = os_strchr(sstart, '#');
  70                 if (end)
  71                         *end-- = '\0';
  72                 else
  73                         end = pos + os_strlen(pos) - 1;
  74
  75                 /* Remove trailing white space. */
  76                 while (end > pos &&
  77                        (*end == '\n' || *end == ' ' || *end == '\t' ||
  78                         *end == '\r'))
  79                         *end-- = '\0';
  80
  81                 if (*pos == '\0')
  82                         continue;
  83
  84                 if (_pos)
  85                         *_pos = pos;
  86                 return pos;
  87         }
  88
  89         if (_pos)
  90                 *_pos = NULL;
  91         return NULL;
  92 }
  93
  94
  95 static int wpa_config_validate_network(struct wpa_ssid *ssid, int line)
  96 {
  97         int errors = 0;
  98
  99         if (ssid->passphrase) {
 100                 if (ssid->psk_set) {
 101                         wpa_printf(MSG_ERROR, "Line %d: both PSK and "
 102                                    "passphrase configured.", line);
 103                         errors++;
 104                 }
 105                 wpa_config_update_psk(ssid);
 106         }
 107
 108         if ((ssid->key_mgmt & (WPA_KEY_MGMT_PSK | WPA_KEY_MGMT_FT_PSK |
 109                                WPA_KEY_MGMT_PSK_SHA256)) &&
 110             !ssid->psk_set) {
 111                 wpa_printf(MSG_ERROR, "Line %d: WPA-PSK accepted for key "
 112                            "management, but no PSK configured.", line);
 113                 errors++;
 114         }
 115
 116         if ((ssid->group_cipher & WPA_CIPHER_CCMP) &&
 117             !(ssid->pairwise_cipher & WPA_CIPHER_CCMP) &&
 118             !(ssid->pairwise_cipher & WPA_CIPHER_NONE)) {
 119                 /* Group cipher cannot be stronger than the pairwise cipher. */
 120                 wpa_printf(MSG_DEBUG, "Line %d: removed CCMP from group cipher"
 121                            " list since it was not allowed for pairwise "
 122                            "cipher", line);
 123                 ssid->group_cipher &= ~WPA_CIPHER_CCMP;
 124         }
 125
 126         return errors;
 127 }
 128
 129
 130 static struct wpa_ssid * wpa_config_read_network(FILE *f, int *line, int id)
 131 {
 132         struct wpa_ssid *ssid;
 133         int errors = 0, end = 0;
 134         char buf[256], *pos, *pos2;
 135
 136         wpa_printf(MSG_MSGDUMP, "Line: %d - start of a new network block",
 137                    *line);
 138         ssid = os_zalloc(sizeof(*ssid));
 139         if (ssid == NULL)
 140                 return NULL;
 141         ssid->id = id;
 142
 143         wpa_config_set_network_defaults(ssid);
 144
 145         while (wpa_config_get_line(buf, sizeof(buf), f, line, &pos)) {
 146                 if (os_strcmp(pos, "}") == 0) {
 147                         end = 1;
 148                         break;
 149                 }
 150
 151                 pos2 = os_strchr(pos, '=');
 152                 if (pos2 == NULL) {
 153                         wpa_printf(MSG_ERROR, "Line %d: Invalid SSID line "
 154                                    "'%s'.", *line, pos);
 155                         errors++;
 156                         continue;
 157                 }
 158
 159                 *pos2++ = '\0';
 160                 if (*pos2 == '"') {
 161                         if (os_strchr(pos2 + 1, '"') == NULL) {
 162                                 wpa_printf(MSG_ERROR, "Line %d: invalid "
 163                                            "quotation '%s'.", *line, pos2);
 164                                 errors++;
 165                                 continue;
 166                         }
 167                 }
 168
 169                 if (wpa_config_set(ssid, pos, pos2, *line) < 0)
 170                         errors++;
 171         }
 172
 173         if (!end) {
 174                 wpa_printf(MSG_ERROR, "Line %d: network block was not "
 175                            "terminated properly.", *line);
 176                 errors++;
 177         }
 178
 179         errors += wpa_config_validate_network(ssid, *line);
 180
 181         if (errors) {
 182                 wpa_config_free_ssid(ssid);
 183                 ssid = NULL;
 184         }
 185
 186         return ssid;
 187 }
 188
 189
 190 #ifndef CONFIG_NO_CONFIG_BLOBS
 191 static struct wpa_config_blob * wpa_config_read_blob(FILE *f, int *line,
 192                                                      const char *name)
 193 {
 194         struct wpa_config_blob *blob;
 195         char buf[256], *pos;
 196         unsigned char *encoded = NULL, *nencoded;
 197         int end = 0;
 198         size_t encoded_len = 0, len;
 199
 200         wpa_printf(MSG_MSGDUMP, "Line: %d - start of a new named blob '%s'",
 201                    *line, name);
 202
 203         while (wpa_config_get_line(buf, sizeof(buf), f, line, &pos)) {
 204                 if (os_strcmp(pos, "}") == 0) {
 205                         end = 1;
 206                         break;
 207                 }
 208
 209                 len = os_strlen(pos);
 210                 nencoded = os_realloc(encoded, encoded_len + len);
 211                 if (nencoded == NULL) {
 212                         wpa_printf(MSG_ERROR, "Line %d: not enough memory for "
 213                                    "blob", *line);
 214                         os_free(encoded);
 215                         return NULL;
 216                 }
 217                 encoded = nencoded;
 218                 os_memcpy(encoded + encoded_len, pos, len);
 219                 encoded_len += len;
 220         }
 221
 222         if (!end) {
 223                 wpa_printf(MSG_ERROR, "Line %d: blob was not terminated "
 224                            "properly", *line);
 225                 os_free(encoded);
 226                 return NULL;
 227         }
 228
 229         blob = os_zalloc(sizeof(*blob));
 230         if (blob == NULL) {
 231                 os_free(encoded);
 232                 return NULL;
 233         }
 234         blob->name = os_strdup(name);
 235         blob->data = base64_decode(encoded, encoded_len, &blob->len);
 236         os_free(encoded);
 237
 238         if (blob->name == NULL || blob->data == NULL) {
 239                 wpa_config_free_blob(blob);
 240                 return NULL;
 241         }
 242
 243         return blob;
 244 }
 245
 246
 247 static int wpa_config_process_blob(struct wpa_config *config, FILE *f,
 248                                    int *line, char *bname)
 249 {
 250         char *name_end;
 251         struct wpa_config_blob *blob;
 252
 253         name_end = os_strchr(bname, '=');
 254         if (name_end == NULL) {
 255                 wpa_printf(MSG_ERROR, "Line %d: no blob name terminator",
 256                            *line);
 257                 return -1;
 258         }
 259         *name_end = '\0';
 260
 261         blob = wpa_config_read_blob(f, line, bname);
 262         if (blob == NULL) {
 263                 wpa_printf(MSG_ERROR, "Line %d: failed to read blob %s",
 264                            *line, bname);
 265                 return -1;
 266         }
 267         wpa_config_set_blob(config, blob);
 268         return 0;
 269 }
 270 #endif /* CONFIG_NO_CONFIG_BLOBS */
 271
 272
 273 struct global_parse_data {
 274         char *name;
 275         int (*parser)(const struct global_parse_data *data,
 276                       struct wpa_config *config, int line, const char *value);
 277         void *param1;
 278 };
 279
 280
 281 static int wpa_config_parse_int(const struct global_parse_data *data,
 282                                 struct wpa_config *config, int line,
 283                                 const char *pos)
 284 {
 285         int *dst;
 286         dst = (int *) (((u8 *) config) + (long) data->param1);
 287         *dst = atoi(pos);
 288         wpa_printf(MSG_DEBUG, "%s=%d", data->name, *dst);
 289         return 0;
 290 }
 291
 292
 293 static int wpa_config_process_country(const struct global_parse_data *data,
 294                                       struct wpa_config *config, int line,
 295                                       const char *pos)
 296 {
 297         if (!pos[0] || !pos[1]) {
 298                 wpa_printf(MSG_DEBUG, "Invalid country set");
 299                 return -1;
 300         }
 301         config->country[0] = pos[0];
 302         config->country[1] = pos[1];
 303         wpa_printf(MSG_DEBUG, "country='%c%c'",
 304                    config->country[0], config->country[1]);
 305         return 0;
 306 }
 307
 308
 309 #ifdef CONFIG_CTRL_IFACE
 310 static int wpa_config_process_ctrl_interface(
 311         const struct global_parse_data *data, struct wpa_config *config,
 312         int line, const char *pos)
 313 {
 314         os_free(config->ctrl_interface);
 315         config->ctrl_interface = os_strdup(pos);
 316         wpa_printf(MSG_DEBUG, "ctrl_interface='%s'", config->ctrl_interface);
 317         return 0;
 318 }
 319
 320
 321 static int wpa_config_process_ctrl_interface_group(
 322         const struct global_parse_data *data, struct wpa_config *config,
 323         int line, const char *pos)
 324 {
 325         os_free(config->ctrl_interface_group);
 326         config->ctrl_interface_group = os_strdup(pos);
 327         wpa_printf(MSG_DEBUG, "ctrl_interface_group='%s' (DEPRECATED)",
 328                    config->ctrl_interface_group);
 329         return 0;
 330 }
 331 #endif /* CONFIG_CTRL_IFACE */
 332
 333
 334 static int wpa_config_process_eapol_version(
 335         const struct global_parse_data *data, struct wpa_config *config,
 336         int line, const char *pos)
 337 {
 338         config->eapol_version = atoi(pos);
 339         if (config->eapol_version < 1 || config->eapol_version > 2) {
 340                 wpa_printf(MSG_ERROR, "Line %d: Invalid EAPOL version (%d): "
 341                            "'%s'.", line, config->eapol_version, pos);
 342                 return -1;
 343         }
 344         wpa_printf(MSG_DEBUG, "eapol_version=%d", config->eapol_version);
 345         return 0;
 346 }
 347
 348
 349 #ifdef EAP_TLS_OPENSSL
 350
 351 static int wpa_config_process_opensc_engine_path(
 352         const struct global_parse_data *data, struct wpa_config *config,
 353         int line, const char *pos)
 354 {
 355         os_free(config->opensc_engine_path);
 356         config->opensc_engine_path = os_strdup(pos);
 357         wpa_printf(MSG_DEBUG, "opensc_engine_path='%s'",
 358                    config->opensc_engine_path);
 359         return 0;
 360 }
 361
 362
 363 static int wpa_config_process_pkcs11_engine_path(
 364         const struct global_parse_data *data, struct wpa_config *config,
 365         int line, const char *pos)
 366 {
 367         os_free(config->pkcs11_engine_path);
 368         config->pkcs11_engine_path = os_strdup(pos);
 369         wpa_printf(MSG_DEBUG, "pkcs11_engine_path='%s'",
 370                    config->pkcs11_engine_path);
 371         return 0;
 372 }
 373
 374
 375 static int wpa_config_process_pkcs11_module_path(
 376         const struct global_parse_data *data, struct wpa_config *config,
 377         int line, const char *pos)
 378 {
 379         os_free(config->pkcs11_module_path);
 380         config->pkcs11_module_path = os_strdup(pos);
 381         wpa_printf(MSG_DEBUG, "pkcs11_module_path='%s'",
 382                    config->pkcs11_module_path);
 383         return 0;
 384 }
 385
 386 #endif /* EAP_TLS_OPENSSL */
 387
 388
 389 static int wpa_config_process_driver_param(
 390         const struct global_parse_data *data, struct wpa_config *config,
 391         int line, const char *pos)
 392 {
 393         os_free(config->driver_param);
 394         config->driver_param = os_strdup(pos);
 395         wpa_printf(MSG_DEBUG, "driver_param='%s'", config->driver_param);
 396         return 0;
 397 }
 398
 399
 400 static int wpa_config_process_load_dynamic_eap(
 401         const struct global_parse_data *data, struct wpa_config *config,
 402         int line, const char *so)
 403 {
 404         int ret;
 405         wpa_printf(MSG_DEBUG, "load_dynamic_eap=%s", so);
 406         ret = eap_peer_method_load(so);
 407         if (ret == -2) {
 408                 wpa_printf(MSG_DEBUG, "This EAP type was already loaded - not "
 409                            "reloading.");
 410         } else if (ret) {
 411                 wpa_printf(MSG_ERROR, "Line %d: Failed to load dynamic EAP "
 412                            "method '%s'.", line, so);
 413                 return -1;
 414         }
 415
 416         return 0;
 417 }
 418
 419
 420 #ifdef CONFIG_WPS
 421
 422 static int wpa_config_process_uuid(const struct global_parse_data *data,
 423                                    struct wpa_config *config, int line,
 424                                    const char *pos)
 425 {
 426         char buf[40];
 427         if (uuid_str2bin(pos, config->uuid)) {
 428                 wpa_printf(MSG_ERROR, "Line %d: invalid UUID", line);
 429                 return -1;
 430         }
 431         uuid_bin2str(config->uuid, buf, sizeof(buf));
 432         wpa_printf(MSG_DEBUG, "uuid=%s", buf);
 433         return 0;
 434 }
 435
 436
 437 static int wpa_config_process_device_name(const struct global_parse_data *data,
 438                                           struct wpa_config *config, int line,
 439                                           const char *pos)
 440 {
 441         if (os_strlen(pos) > 32)
 442                 return -1;
 443         os_free(config->device_name);
 444         config->device_name = os_strdup(pos);
 445         wpa_printf(MSG_DEBUG, "device_name='%s'", config->device_name);
 446         return 0;
 447 }
 448
 449
 450 static int wpa_config_process_manufacturer(
 451         const struct global_parse_data *data, struct wpa_config *config,
 452         int line, const char *pos)
 453 {
 454         if (os_strlen(pos) > 64)
 455                 return -1;
 456         os_free(config->manufacturer);
 457         config->manufacturer = os_strdup(pos);
 458         wpa_printf(MSG_DEBUG, "manufacturer='%s'", config->manufacturer);
 459         return 0;
 460 }
 461
 462
 463 static int wpa_config_process_model_name(const struct global_parse_data *data,
 464                                          struct wpa_config *config, int line,
 465                                          const char *pos)
 466 {
 467         if (os_strlen(pos) > 32)
 468                 return -1;
 469         os_free(config->model_name);
 470         config->model_name = os_strdup(pos);
 471         wpa_printf(MSG_DEBUG, "model_name='%s'", config->model_name);
 472         return 0;
 473 }
 474
 475
 476 static int wpa_config_process_model_number(
 477         const struct global_parse_data *data, struct wpa_config *config,
 478         int line, const char *pos)
 479 {
 480         if (os_strlen(pos) > 32)
 481                 return -1;
 482         os_free(config->model_number);
 483         config->model_number = os_strdup(pos);
 484         wpa_printf(MSG_DEBUG, "model_number='%s'", config->model_number);
 485         return 0;
 486 }
 487
 488
 489 static int wpa_config_process_serial_number(
 490         const struct global_parse_data *data, struct wpa_config *config,
 491         int line, const char *pos)
 492 {
 493         if (os_strlen(pos) > 32)
 494                 return -1;
 495         os_free(config->serial_number);
 496         config->serial_number = os_strdup(pos);
 497         wpa_printf(MSG_DEBUG, "serial_number='%s'", config->serial_number);
 498         return 0;
 499 }
 500
 501
 502 static int wpa_config_process_device_type(const struct global_parse_data *data,
 503                                           struct wpa_config *config, int line,
 504                                           const char *pos)
 505 {
 506         os_free(config->device_type);
 507         config->device_type = os_strdup(pos);
 508         wpa_printf(MSG_DEBUG, "device_type='%s'", config->device_type);
 509         return 0;
 510 }
 511
 512
 513 static int wpa_config_process_os_version(const struct global_parse_data *data,
 514                                          struct wpa_config *config, int line,
 515                                          const char *pos)
 516 {
 517         if (hexstr2bin(pos, config->os_version, 4)) {
 518                 wpa_printf(MSG_ERROR, "Line %d: invalid os_version", line);
 519                 return -1;
 520         }
 521         wpa_printf(MSG_DEBUG, "os_version=%08x",
 522                    WPA_GET_BE32(config->os_version));
 523         return 0;
 524 }
 525
 526 #endif /* CONFIG_WPS */
 527
 528
 529 #ifdef OFFSET
 530 #undef OFFSET
 531 #endif /* OFFSET */
 532 /* OFFSET: Get offset of a variable within the wpa_config structure */
 533 #define OFFSET(v) ((void *) &((struct wpa_config *) 0)->v)
 534
 535 #define FUNC(f) #f, wpa_config_process_ ## f, OFFSET(f)
 536 #define FUNC_NO_VAR(f) #f, wpa_config_process_ ## f, 0
 537 #define INT(f) #f, wpa_config_parse_int, OFFSET(f)
 538
 539 static const struct global_parse_data global_fields[] = {
 540 #ifdef CONFIG_CTRL_IFACE
 541         { FUNC(ctrl_interface) },
 542         { FUNC(ctrl_interface_group) },
 543 #endif /* CONFIG_CTRL_IFACE */
 544         { FUNC(eapol_version) },
 545         { INT(ap_scan) },
 546         { INT(fast_reauth) },
 547 #ifdef EAP_TLS_OPENSSL
 548         { FUNC(opensc_engine_path) },
 549         { FUNC(pkcs11_engine_path) },
 550         { FUNC(pkcs11_module_path) },
 551 #endif /* EAP_TLS_OPENSSL */
 552         { FUNC(driver_param) },
 553         { INT(dot11RSNAConfigPMKLifetime) },
 554         { INT(dot11RSNAConfigPMKReauthThreshold) },
 555         { INT(dot11RSNAConfigSATimeout) },
 556 #ifndef CONFIG_NO_CONFIG_WRITE
 557         { INT(update_config) },
 558 #endif /* CONFIG_NO_CONFIG_WRITE */
 559         { FUNC_NO_VAR(load_dynamic_eap) },
 560 #ifdef CONFIG_WPS
 561         { FUNC(uuid) },
 562         { FUNC(device_name) },
 563         { FUNC(manufacturer) },
 564         { FUNC(model_name) },
 565         { FUNC(model_number) },
 566         { FUNC(serial_number) },
 567         { FUNC(device_type) },
 568         { FUNC(os_version) },
 569 #endif /* CONFIG_WPS */
 570         { FUNC(country) }
 571 };
 572
 573 #undef FUNC
 574 #undef INT
 575 #define NUM_GLOBAL_FIELDS (sizeof(global_fields) / sizeof(global_fields[0]))
 576
 577
 578 static int wpa_config_process_global(struct wpa_config *config, char *pos,
 579                                      int line)
 580 {
 581         size_t i;
 582         int ret = 0;
 583
 584         for (i = 0; i < NUM_GLOBAL_FIELDS; i++) {
 585                 const struct global_parse_data *field = &global_fields[i];
 586                 size_t flen = os_strlen(field->name);
 587                 if (os_strncmp(pos, field->name, flen) != 0 ||
 588                     pos[flen] != '=')
 589                         continue;
 590
 591                 if (field->parser(field, config, line, pos + flen + 1)) {
 592                         wpa_printf(MSG_ERROR, "Line %d: failed to "
 593                                    "parse '%s'.", line, pos);
 594                         ret = -1;
 595                 }
 596                 break;
 597         }
 598         if (i == NUM_GLOBAL_FIELDS) {
 599                 wpa_printf(MSG_ERROR, "Line %d: unknown global field '%s'.",
 600                            line, pos);
 601                 ret = -1;
 602         }
 603
 604         return ret;
 605 }
 606
 607
 608 struct wpa_config * wpa_config_read(const char *name)
 609 {
 610         FILE *f;
 611         char buf[256], *pos;
 612         int errors = 0, line = 0;
 613         struct wpa_ssid *ssid, *tail = NULL, *head = NULL;
 614         struct wpa_config *config;
 615         int id = 0;
 616
 617         config = wpa_config_alloc_empty(NULL, NULL);
 618         if (config == NULL)
 619                 return NULL;
 620         wpa_printf(MSG_DEBUG, "Reading configuration file '%s'", name);
 621         f = fopen(name, "r");
 622         if (f == NULL) {
 623                 os_free(config);
 624                 return NULL;
 625         }
 626
 627         while (wpa_config_get_line(buf, sizeof(buf), f, &line, &pos)) {
 628                 if (os_strcmp(pos, "network={") == 0) {
 629                         ssid = wpa_config_read_network(f, &line, id++);
 630                         if (ssid == NULL) {
 631                                 wpa_printf(MSG_ERROR, "Line %d: failed to "
 632                                            "parse network block.", line);
 633                                 errors++;
 634                                 continue;
 635                         }
 636                         if (head == NULL) {
 637                                 head = tail = ssid;
 638                         } else {
 639                                 tail->next = ssid;
 640                                 tail = ssid;
 641                         }
 642                         if (wpa_config_add_prio_network(config, ssid)) {
 643                                 wpa_printf(MSG_ERROR, "Line %d: failed to add "
 644                                            "network block to priority list.",
 645                                            line);
 646                                 errors++;
 647                                 continue;
 648                         }
 649 #ifndef CONFIG_NO_CONFIG_BLOBS
 650                 } else if (os_strncmp(pos, "blob-base64-", 12) == 0) {
 651                         if (wpa_config_process_blob(config, f, &line, pos + 12)
 652                             < 0) {
 653                                 errors++;
 654                                 continue;
 655                         }
 656 #endif /* CONFIG_NO_CONFIG_BLOBS */
 657                 } else if (wpa_config_process_global(config, pos, line) < 0) {
 658                         wpa_printf(MSG_ERROR, "Line %d: Invalid configuration "
 659                                    "line '%s'.", line, pos);
 660                         errors++;
 661                         continue;
 662                 }
 663         }
 664
 665         fclose(f);
 666
 667         config->ssid = head;
 668         wpa_config_debug_dump_networks(config);
 669
 670         if (errors) {
 671                 wpa_config_free(config);
 672                 config = NULL;
 673                 head = NULL;
 674         }
 675
 676         return config;
 677 }
 678
 679
 680 #ifndef CONFIG_NO_CONFIG_WRITE
 681
 682 static void write_str(FILE *f, const char *field, struct wpa_ssid *ssid)
 683 {
 684         char *value = wpa_config_get(ssid, field);
 685         if (value == NULL)
 686                 return;
 687         fprintf(f, "\t%s=%s\n", field, value);
 688         os_free(value);
 689 }
 690
 691
 692 static void write_int(FILE *f, const char *field, int value, int def)
 693 {
 694         if (value == def)
 695                 return;
 696         fprintf(f, "\t%s=%d\n", field, value);
 697 }
 698
 699
 700 static void write_bssid(FILE *f, struct wpa_ssid *ssid)
 701 {
 702         char *value = wpa_config_get(ssid, "bssid");
 703         if (value == NULL)
 704                 return;
 705         fprintf(f, "\tbssid=%s\n", value);
 706         os_free(value);
 707 }
 708
 709
 710 static void write_psk(FILE *f, struct wpa_ssid *ssid)
 711 {
 712         char *value = wpa_config_get(ssid, "psk");
 713         if (value == NULL)
 714                 return;
 715         fprintf(f, "\tpsk=%s\n", value);
 716         os_free(value);
 717 }
 718
 719
 720 static void write_proto(FILE *f, struct wpa_ssid *ssid)
 721 {
 722         char *value;
 723
 724         if (ssid->proto == DEFAULT_PROTO)
 725                 return;
 726
 727         value = wpa_config_get(ssid, "proto");
 728         if (value == NULL)
 729                 return;
 730         if (value[0])
 731                 fprintf(f, "\tproto=%s\n", value);
 732         os_free(value);
 733 }
 734
 735
 736 static void write_key_mgmt(FILE *f, struct wpa_ssid *ssid)
 737 {
 738         char *value;
 739
 740         if (ssid->key_mgmt == DEFAULT_KEY_MGMT)
 741                 return;
 742
 743         value = wpa_config_get(ssid, "key_mgmt");
 744         if (value == NULL)
 745                 return;
 746         if (value[0])
 747                 fprintf(f, "\tkey_mgmt=%s\n", value);
 748         os_free(value);
 749 }
 750
 751
 752 static void write_pairwise(FILE *f, struct wpa_ssid *ssid)
 753 {
 754         char *value;
 755
 756         if (ssid->pairwise_cipher == DEFAULT_PAIRWISE)
 757                 return;
 758
 759         value = wpa_config_get(ssid, "pairwise");
 760         if (value == NULL)
 761                 return;
 762         if (value[0])
 763                 fprintf(f, "\tpairwise=%s\n", value);
 764         os_free(value);
 765 }
 766
 767
 768 static void write_group(FILE *f, struct wpa_ssid *ssid)
 769 {
 770         char *value;
 771
 772         if (ssid->group_cipher == DEFAULT_GROUP)
 773                 return;
 774
 775         value = wpa_config_get(ssid, "group");
 776         if (value == NULL)
 777                 return;
 778         if (value[0])
 779                 fprintf(f, "\tgroup=%s\n", value);
 780         os_free(value);
 781 }
 782
 783
 784 static void write_auth_alg(FILE *f, struct wpa_ssid *ssid)
 785 {
 786         char *value;
 787
 788         if (ssid->auth_alg == 0)
 789                 return;
 790
 791         value = wpa_config_get(ssid, "auth_alg");
 792         if (value == NULL)
 793                 return;
 794         if (value[0])
 795                 fprintf(f, "\tauth_alg=%s\n", value);
 796         os_free(value);
 797 }
 798
 799
 800 #ifdef IEEE8021X_EAPOL
 801 static void write_eap(FILE *f, struct wpa_ssid *ssid)
 802 {
 803         char *value;
 804
 805         value = wpa_config_get(ssid, "eap");
 806         if (value == NULL)
 807                 return;
 808
 809         if (value[0])
 810                 fprintf(f, "\teap=%s\n", value);
 811         os_free(value);
 812 }
 813 #endif /* IEEE8021X_EAPOL */
 814
 815
 816 static void write_wep_key(FILE *f, int idx, struct wpa_ssid *ssid)
 817 {
 818         char field[20], *value;
 819         int res;
 820
 821         res = os_snprintf(field, sizeof(field), "wep_key%d", idx);
 822         if (res < 0 || (size_t) res >= sizeof(field))
 823                 return;
 824         value = wpa_config_get(ssid, field);
 825         if (value) {
 826                 fprintf(f, "\t%s=%s\n", field, value);
 827                 os_free(value);
 828         }
 829 }
 830
 831
 832 static void wpa_config_write_network(FILE *f, struct wpa_ssid *ssid)
 833 {
 834         int i;
 835
 836 #define STR(t) write_str(f, #t, ssid)
 837 #define INT(t) write_int(f, #t, ssid->t, 0)
 838 #define INTe(t) write_int(f, #t, ssid->eap.t, 0)
 839 #define INT_DEF(t, def) write_int(f, #t, ssid->t, def)
 840 #define INT_DEFe(t, def) write_int(f, #t, ssid->eap.t, def)
 841
 842         STR(ssid);
 843         INT(scan_ssid);
 844         write_bssid(f, ssid);
 845         write_psk(f, ssid);
 846         write_proto(f, ssid);
 847         write_key_mgmt(f, ssid);
 848         write_pairwise(f, ssid);
 849         write_group(f, ssid);
 850         write_auth_alg(f, ssid);
 851 #ifdef IEEE8021X_EAPOL
 852         write_eap(f, ssid);
 853         STR(identity);
 854         STR(anonymous_identity);
 855         STR(password);
 856         STR(ca_cert);
 857         STR(ca_path);
 858         STR(client_cert);
 859         STR(private_key);
 860         STR(private_key_passwd);
 861         STR(dh_file);
 862         STR(subject_match);
 863         STR(altsubject_match);
 864         STR(ca_cert2);
 865         STR(ca_path2);
 866         STR(client_cert2);
 867         STR(private_key2);
 868         STR(private_key2_passwd);
 869         STR(dh_file2);
 870         STR(subject_match2);
 871         STR(altsubject_match2);
 872         STR(phase1);
 873         STR(phase2);
 874         STR(pcsc);
 875         STR(pin);
 876         STR(engine_id);
 877         STR(key_id);
 878         STR(cert_id);
 879         STR(ca_cert_id);
 880         STR(key2_id);
 881         STR(pin2);
 882         STR(engine2_id);
 883         STR(cert2_id);
 884         STR(ca_cert2_id);
 885         INTe(engine);
 886         INTe(engine2);
 887         INT_DEF(eapol_flags, DEFAULT_EAPOL_FLAGS);
 888 #endif /* IEEE8021X_EAPOL */
 889         for (i = 0; i < 4; i++)
 890                 write_wep_key(f, i, ssid);
 891         INT(wep_tx_keyidx);
 892         INT(priority);
 893 #ifdef IEEE8021X_EAPOL
 894         INT_DEF(eap_workaround, DEFAULT_EAP_WORKAROUND);
 895         STR(pac_file);
 896         INT_DEFe(fragment_size, DEFAULT_FRAGMENT_SIZE);
 897 #endif /* IEEE8021X_EAPOL */
 898         INT(mode);
 899         INT(proactive_key_caching);
 900         INT(disabled);
 901         INT(peerkey);
 902 #ifdef CONFIG_IEEE80211W
 903         INT(ieee80211w);
 904 #endif /* CONFIG_IEEE80211W */
 905         STR(id_str);
 906
 907 #undef STR
 908 #undef INT
 909 #undef INT_DEF
 910 }
 911
 912
 913 #ifndef CONFIG_NO_CONFIG_BLOBS
 914 static int wpa_config_write_blob(FILE *f, struct wpa_config_blob *blob)
 915 {
 916         unsigned char *encoded;
 917
 918         encoded = base64_encode(blob->data, blob->len, NULL);
 919         if (encoded == NULL)
 920                 return -1;
 921
 922         fprintf(f, "\nblob-base64-%s={\n%s}\n", blob->name, encoded);
 923         os_free(encoded);
 924         return 0;
 925 }
 926 #endif /* CONFIG_NO_CONFIG_BLOBS */
 927
 928
 929 static void wpa_config_write_global(FILE *f, struct wpa_config *config)
 930 {
 931 #ifdef CONFIG_CTRL_IFACE
 932         if (config->ctrl_interface)
 933                 fprintf(f, "ctrl_interface=%s\n", config->ctrl_interface);
 934         if (config->ctrl_interface_group)
 935                 fprintf(f, "ctrl_interface_group=%s\n",
 936                         config->ctrl_interface_group);
 937 #endif /* CONFIG_CTRL_IFACE */
 938         if (config->eapol_version != DEFAULT_EAPOL_VERSION)
 939                 fprintf(f, "eapol_version=%d\n", config->eapol_version);
 940         if (config->ap_scan != DEFAULT_AP_SCAN)
 941                 fprintf(f, "ap_scan=%d\n", config->ap_scan);
 942         if (config->fast_reauth != DEFAULT_FAST_REAUTH)
 943                 fprintf(f, "fast_reauth=%d\n", config->fast_reauth);
 944 #ifdef EAP_TLS_OPENSSL
 945         if (config->opensc_engine_path)
 946                 fprintf(f, "opensc_engine_path=%s\n",
 947                         config->opensc_engine_path);
 948         if (config->pkcs11_engine_path)
 949                 fprintf(f, "pkcs11_engine_path=%s\n",
 950                         config->pkcs11_engine_path);
 951         if (config->pkcs11_module_path)
 952                 fprintf(f, "pkcs11_module_path=%s\n",
 953                         config->pkcs11_module_path);
 954 #endif /* EAP_TLS_OPENSSL */
 955         if (config->driver_param)
 956                 fprintf(f, "driver_param=%s\n", config->driver_param);
 957         if (config->dot11RSNAConfigPMKLifetime)
 958                 fprintf(f, "dot11RSNAConfigPMKLifetime=%d\n",
 959                         config->dot11RSNAConfigPMKLifetime);
 960         if (config->dot11RSNAConfigPMKReauthThreshold)
 961                 fprintf(f, "dot11RSNAConfigPMKReauthThreshold=%d\n",
 962                         config->dot11RSNAConfigPMKReauthThreshold);
 963         if (config->dot11RSNAConfigSATimeout)
 964                 fprintf(f, "dot11RSNAConfigSATimeout=%d\n",
 965                         config->dot11RSNAConfigSATimeout);
 966         if (config->update_config)
 967                 fprintf(f, "update_config=%d\n", config->update_config);
 968 #ifdef CONFIG_WPS
 969         if (is_nil_uuid(config->uuid)) {
 970                 char buf[40];
 971                 uuid_bin2str(config->uuid, buf, sizeof(buf));
 972                 fprintf(f, "uuid=%s\n", buf);
 973         }
 974         if (config->device_name)
 975                 fprintf(f, "device_name=%s\n", config->device_name);
 976         if (config->manufacturer)
 977                 fprintf(f, "manufacturer=%s\n", config->manufacturer);
 978         if (config->model_name)
 979                 fprintf(f, "model_name=%s\n", config->model_name);
 980         if (config->model_number)
 981                 fprintf(f, "model_number=%s\n", config->model_number);
 982         if (config->serial_number)
 983                 fprintf(f, "serial_number=%s\n", config->serial_number);
 984         if (config->device_type)
 985                 fprintf(f, "device_type=%s\n", config->device_type);
 986         if (config->os_version)
 987                 fprintf(f, "os_version=%08x\n",
 988                         WPA_GET_BE32(config->os_version));
 989 #endif /* CONFIG_WPS */
 990         if (config->country[0] && config->country[1]) {
 991                 fprintf(f, "country=%c%c\n",
 992                         config->country[0], config->country[1]);
 993         }
 994 }
 995
 996 #endif /* CONFIG_NO_CONFIG_WRITE */
 997
 998
 999 int wpa_config_write(const char *name, struct wpa_config *config)
1000 {
1001 #ifndef CONFIG_NO_CONFIG_WRITE
1002         FILE *f;
1003         struct wpa_ssid *ssid;
1004 #ifndef CONFIG_NO_CONFIG_BLOBS
1005         struct wpa_config_blob *blob;
1006 #endif /* CONFIG_NO_CONFIG_BLOBS */
1007         int ret = 0;
1008
1009         wpa_printf(MSG_DEBUG, "Writing configuration file '%s'", name);
1010
1011         f = fopen(name, "w");
1012         if (f == NULL) {
1013                 wpa_printf(MSG_DEBUG, "Failed to open '%s' for writing", name);
1014                 return -1;
1015         }
1016
1017         wpa_config_write_global(f, config);
1018
1019         for (ssid = config->ssid; ssid; ssid = ssid->next) {
1020                 if (ssid->key_mgmt == WPA_KEY_MGMT_WPS)
1021                         continue; /* do not save temporary WPS networks */
1022                 fprintf(f, "\nnetwork={\n");
1023                 wpa_config_write_network(f, ssid);
1024                 fprintf(f, "}\n");
1025         }
1026
1027 #ifndef CONFIG_NO_CONFIG_BLOBS
1028         for (blob = config->blobs; blob; blob = blob->next) {
1029                 ret = wpa_config_write_blob(f, blob);
1030                 if (ret)
1031                         break;
1032         }
1033 #endif /* CONFIG_NO_CONFIG_BLOBS */
1034
1035         fclose(f);
1036
1037         wpa_printf(MSG_DEBUG, "Configuration file '%s' written %ssuccessfully",
1038                    name, ret ? "un" : "");
1039         return ret;
1040 #else /* CONFIG_NO_CONFIG_WRITE */
1041         return -1;
1042 #endif /* CONFIG_NO_CONFIG_WRITE */
1043 }