wpa_supplicant/config_file.c

   1 /*
   2  * WPA Supplicant / Configuration backend: text file
   3  * Copyright (c) 2003-2012, Jouni Malinen <j@w1.fi>
   4  *
   5  * This software may be distributed under the terms of the BSD license.
   6  * See README for more details.
   7  *
   8  * This file implements a configuration backend for text files. All the
   9  * configuration information is stored in a text file that uses a format
  10  * described in the sample configuration file, wpa_supplicant.conf.
  11  */
  12
  13 #include "includes.h"
  14
  15 #include "common.h"
  16 #include "config.h"
  17 #include "base64.h"
  18 #include "uuid.h"
  19 #include "p2p/p2p.h"
  20
  21
  22 /**
  23  * wpa_config_get_line - Read the next configuration file line
  24  * @s: Buffer for the line
  25  * @size: The buffer length
  26  * @stream: File stream to read from
  27  * @line: Pointer to a variable storing the file line number
  28  * @_pos: Buffer for the pointer to the beginning of data on the text line or
  29  * %NULL if not needed (returned value used instead)
  30  * Returns: Pointer to the beginning of data on the text line or %NULL if no
  31  * more text lines are available.
  32  *
  33  * This function reads the next non-empty line from the configuration file and
  34  * removes comments. The returned string is guaranteed to be null-terminated.
  35  */
  36 static char * wpa_config_get_line(char *s, int size, FILE *stream, int *line,
  37                                   char **_pos)
  38 {
  39         char *pos, *end, *sstart;
  40
  41         while (fgets(s, size, stream)) {
  42                 (*line)++;
  43                 s[size - 1] = '\0';
  44                 pos = s;
  45
  46                 /* Skip white space from the beginning of line. */
  47                 while (*pos == ' ' || *pos == '\t' || *pos == '\r')
  48                         pos++;
  49
  50                 /* Skip comment lines and empty lines */
  51                 if (*pos == '#' || *pos == '\n' || *pos == '\0')
  52                         continue;
  53
  54                 /*
  55                  * Remove # comments unless they are within a double quoted
  56                  * string.
  57                  */
  58                 sstart = os_strchr(pos, '"');
  59                 if (sstart)
  60                         sstart = os_strrchr(sstart + 1, '"');
  61                 if (!sstart)
  62                         sstart = pos;
  63                 end = os_strchr(sstart, '#');
  64                 if (end)
  65                         *end-- = '\0';
  66                 else
  67                         end = pos + os_strlen(pos) - 1;
  68
  69                 /* Remove trailing white space. */
  70                 while (end > pos &&
  71                        (*end == '\n' || *end == ' ' || *end == '\t' ||
  72                         *end == '\r'))
  73                         *end-- = '\0';
  74
  75                 if (*pos == '\0')
  76                         continue;
  77
  78                 if (_pos)
  79                         *_pos = pos;
  80                 return pos;
  81         }
  82
  83         if (_pos)
  84                 *_pos = NULL;
  85         return NULL;
  86 }
  87
  88
  89 static int wpa_config_validate_network(struct wpa_ssid *ssid, int line)
  90 {
  91         int errors = 0;
  92
  93         if (ssid->passphrase) {
  94                 if (ssid->psk_set) {
  95                         wpa_printf(MSG_ERROR, "Line %d: both PSK and "
  96                                    "passphrase configured.", line);
  97                         errors++;
  98                 }
  99                 wpa_config_update_psk(ssid);
 100         }
 101
 102         if (wpa_key_mgmt_wpa_psk(ssid->key_mgmt) && !ssid->psk_set) {
 103                 wpa_printf(MSG_ERROR, "Line %d: WPA-PSK accepted for key "
 104                            "management, but no PSK configured.", line);
 105                 errors++;
 106         }
 107
 108         if ((ssid->group_cipher & WPA_CIPHER_CCMP) &&
 109             !(ssid->pairwise_cipher & WPA_CIPHER_CCMP) &&
 110             !(ssid->pairwise_cipher & WPA_CIPHER_NONE)) {
 111                 /* Group cipher cannot be stronger than the pairwise cipher. */
 112                 wpa_printf(MSG_DEBUG, "Line %d: removed CCMP from group cipher"
 113                            " list since it was not allowed for pairwise "
 114                            "cipher", line);
 115                 ssid->group_cipher &= ~WPA_CIPHER_CCMP;
 116         }
 117
 118         return errors;
 119 }
 120
 121
 122 static struct wpa_ssid * wpa_config_read_network(FILE *f, int *line, int id)
 123 {
 124         struct wpa_ssid *ssid;
 125         int errors = 0, end = 0;
 126         char buf[256], *pos, *pos2;
 127
 128         wpa_printf(MSG_MSGDUMP, "Line: %d - start of a new network block",
 129                    *line);
 130         ssid = os_zalloc(sizeof(*ssid));
 131         if (ssid == NULL)
 132                 return NULL;
 133         ssid->id = id;
 134
 135         wpa_config_set_network_defaults(ssid);
 136
 137         while (wpa_config_get_line(buf, sizeof(buf), f, line, &pos)) {
 138                 if (os_strcmp(pos, "}") == 0) {
 139                         end = 1;
 140                         break;
 141                 }
 142
 143                 pos2 = os_strchr(pos, '=');
 144                 if (pos2 == NULL) {
 145                         wpa_printf(MSG_ERROR, "Line %d: Invalid SSID line "
 146                                    "'%s'.", *line, pos);
 147                         errors++;
 148                         continue;
 149                 }
 150
 151                 *pos2++ = '\0';
 152                 if (*pos2 == '"') {
 153                         if (os_strchr(pos2 + 1, '"') == NULL) {
 154                                 wpa_printf(MSG_ERROR, "Line %d: invalid "
 155                                            "quotation '%s'.", *line, pos2);
 156                                 errors++;
 157                                 continue;
 158                         }
 159                 }
 160
 161                 if (wpa_config_set(ssid, pos, pos2, *line) < 0)
 162                         errors++;
 163         }
 164
 165         if (!end) {
 166                 wpa_printf(MSG_ERROR, "Line %d: network block was not "
 167                            "terminated properly.", *line);
 168                 errors++;
 169         }
 170
 171         errors += wpa_config_validate_network(ssid, *line);
 172
 173         if (errors) {
 174                 wpa_config_free_ssid(ssid);
 175                 ssid = NULL;
 176         }
 177
 178         return ssid;
 179 }
 180
 181
 182 static struct wpa_cred * wpa_config_read_cred(FILE *f, int *line, int id)
 183 {
 184         struct wpa_cred *cred;
 185         int errors = 0, end = 0;
 186         char buf[256], *pos, *pos2;
 187
 188         wpa_printf(MSG_MSGDUMP, "Line: %d - start of a new cred block", *line);
 189         cred = os_zalloc(sizeof(*cred));
 190         if (cred == NULL)
 191                 return NULL;
 192         cred->id = id;
 193
 194         while (wpa_config_get_line(buf, sizeof(buf), f, line, &pos)) {
 195                 if (os_strcmp(pos, "}") == 0) {
 196                         end = 1;
 197                         break;
 198                 }
 199
 200                 pos2 = os_strchr(pos, '=');
 201                 if (pos2 == NULL) {
 202                         wpa_printf(MSG_ERROR, "Line %d: Invalid cred line "
 203                                    "'%s'.", *line, pos);
 204                         errors++;
 205                         continue;
 206                 }
 207
 208                 *pos2++ = '\0';
 209                 if (*pos2 == '"') {
 210                         if (os_strchr(pos2 + 1, '"') == NULL) {
 211                                 wpa_printf(MSG_ERROR, "Line %d: invalid "
 212                                            "quotation '%s'.", *line, pos2);
 213                                 errors++;
 214                                 continue;
 215                         }
 216                 }
 217
 218                 if (wpa_config_set_cred(cred, pos, pos2, *line) < 0)
 219                         errors++;
 220         }
 221
 222         if (!end) {
 223                 wpa_printf(MSG_ERROR, "Line %d: cred block was not "
 224                            "terminated properly.", *line);
 225                 errors++;
 226         }
 227
 228         if (errors) {
 229                 wpa_config_free_cred(cred);
 230                 cred = NULL;
 231         }
 232
 233         return cred;
 234 }
 235
 236
 237 #ifndef CONFIG_NO_CONFIG_BLOBS
 238 static struct wpa_config_blob * wpa_config_read_blob(FILE *f, int *line,
 239                                                      const char *name)
 240 {
 241         struct wpa_config_blob *blob;
 242         char buf[256], *pos;
 243         unsigned char *encoded = NULL, *nencoded;
 244         int end = 0;
 245         size_t encoded_len = 0, len;
 246
 247         wpa_printf(MSG_MSGDUMP, "Line: %d - start of a new named blob '%s'",
 248                    *line, name);
 249
 250         while (wpa_config_get_line(buf, sizeof(buf), f, line, &pos)) {
 251                 if (os_strcmp(pos, "}") == 0) {
 252                         end = 1;
 253                         break;
 254                 }
 255
 256                 len = os_strlen(pos);
 257                 nencoded = os_realloc(encoded, encoded_len + len);
 258                 if (nencoded == NULL) {
 259                         wpa_printf(MSG_ERROR, "Line %d: not enough memory for "
 260                                    "blob", *line);
 261                         os_free(encoded);
 262                         return NULL;
 263                 }
 264                 encoded = nencoded;
 265                 os_memcpy(encoded + encoded_len, pos, len);
 266                 encoded_len += len;
 267         }
 268
 269         if (!end) {
 270                 wpa_printf(MSG_ERROR, "Line %d: blob was not terminated "
 271                            "properly", *line);
 272                 os_free(encoded);
 273                 return NULL;
 274         }
 275
 276         blob = os_zalloc(sizeof(*blob));
 277         if (blob == NULL) {
 278                 os_free(encoded);
 279                 return NULL;
 280         }
 281         blob->name = os_strdup(name);
 282         blob->data = base64_decode(encoded, encoded_len, &blob->len);
 283         os_free(encoded);
 284
 285         if (blob->name == NULL || blob->data == NULL) {
 286                 wpa_config_free_blob(blob);
 287                 return NULL;
 288         }
 289
 290         return blob;
 291 }
 292
 293
 294 static int wpa_config_process_blob(struct wpa_config *config, FILE *f,
 295                                    int *line, char *bname)
 296 {
 297         char *name_end;
 298         struct wpa_config_blob *blob;
 299
 300         name_end = os_strchr(bname, '=');
 301         if (name_end == NULL) {
 302                 wpa_printf(MSG_ERROR, "Line %d: no blob name terminator",
 303                            *line);
 304                 return -1;
 305         }
 306         *name_end = '\0';
 307
 308         blob = wpa_config_read_blob(f, line, bname);
 309         if (blob == NULL) {
 310                 wpa_printf(MSG_ERROR, "Line %d: failed to read blob %s",
 311                            *line, bname);
 312                 return -1;
 313         }
 314         wpa_config_set_blob(config, blob);
 315         return 0;
 316 }
 317 #endif /* CONFIG_NO_CONFIG_BLOBS */
 318
 319
 320 struct wpa_config * wpa_config_read(const char *name)
 321 {
 322         FILE *f;
 323         char buf[256], *pos;
 324         int errors = 0, line = 0;
 325         struct wpa_ssid *ssid, *tail = NULL, *head = NULL;
 326         struct wpa_cred *cred, *cred_tail = NULL, *cred_head = NULL;
 327         struct wpa_config *config;
 328         int id = 0;
 329         int cred_id = 0;
 330
 331         config = wpa_config_alloc_empty(NULL, NULL);
 332         if (config == NULL)
 333                 return NULL;
 334         wpa_printf(MSG_DEBUG, "Reading configuration file '%s'", name);
 335         f = fopen(name, "r");
 336         if (f == NULL) {
 337                 os_free(config);
 338                 return NULL;
 339         }
 340
 341         while (wpa_config_get_line(buf, sizeof(buf), f, &line, &pos)) {
 342                 if (os_strcmp(pos, "network={") == 0) {
 343                         ssid = wpa_config_read_network(f, &line, id++);
 344                         if (ssid == NULL) {
 345                                 wpa_printf(MSG_ERROR, "Line %d: failed to "
 346                                            "parse network block.", line);
 347                                 errors++;
 348                                 continue;
 349                         }
 350                         if (head == NULL) {
 351                                 head = tail = ssid;
 352                         } else {
 353                                 tail->next = ssid;
 354                                 tail = ssid;
 355                         }
 356                         if (wpa_config_add_prio_network(config, ssid)) {
 357                                 wpa_printf(MSG_ERROR, "Line %d: failed to add "
 358                                            "network block to priority list.",
 359                                            line);
 360                                 errors++;
 361                                 continue;
 362                         }
 363                 } else if (os_strcmp(pos, "cred={") == 0) {
 364                         cred = wpa_config_read_cred(f, &line, cred_id++);
 365                         if (cred == NULL) {
 366                                 wpa_printf(MSG_ERROR, "Line %d: failed to "
 367                                            "parse cred block.", line);
 368                                 errors++;
 369                                 continue;
 370                         }
 371                         if (cred_head == NULL) {
 372                                 cred_head = cred_tail = cred;
 373                         } else {
 374                                 cred_tail->next = cred;
 375                                 cred_tail = cred;
 376                         }
 377 #ifndef CONFIG_NO_CONFIG_BLOBS
 378                 } else if (os_strncmp(pos, "blob-base64-", 12) == 0) {
 379                         if (wpa_config_process_blob(config, f, &line, pos + 12)
 380                             < 0) {
 381                                 errors++;
 382                                 continue;
 383                         }
 384 #endif /* CONFIG_NO_CONFIG_BLOBS */
 385                 } else if (wpa_config_process_global(config, pos, line) < 0) {
 386                         wpa_printf(MSG_ERROR, "Line %d: Invalid configuration "
 387                                    "line '%s'.", line, pos);
 388                         errors++;
 389                         continue;
 390                 }
 391         }
 392
 393         fclose(f);
 394
 395         config->ssid = head;
 396         wpa_config_debug_dump_networks(config);
 397         config->cred = cred_head;
 398
 399 #ifndef WPA_IGNORE_CONFIG_ERRORS
 400         if (errors) {
 401                 wpa_config_free(config);
 402                 config = NULL;
 403                 head = NULL;
 404         }
 405 #endif /* WPA_IGNORE_CONFIG_ERRORS */
 406
 407         return config;
 408 }
 409
 410
 411 #ifndef CONFIG_NO_CONFIG_WRITE
 412
 413 static void write_str(FILE *f, const char *field, struct wpa_ssid *ssid)
 414 {
 415         char *value = wpa_config_get(ssid, field);
 416         if (value == NULL)
 417                 return;
 418         fprintf(f, "\t%s=%s\n", field, value);
 419         os_free(value);
 420 }
 421
 422
 423 static void write_int(FILE *f, const char *field, int value, int def)
 424 {
 425         if (value == def)
 426                 return;
 427         fprintf(f, "\t%s=%d\n", field, value);
 428 }
 429
 430
 431 static void write_bssid(FILE *f, struct wpa_ssid *ssid)
 432 {
 433         char *value = wpa_config_get(ssid, "bssid");
 434         if (value == NULL)
 435                 return;
 436         fprintf(f, "\tbssid=%s\n", value);
 437         os_free(value);
 438 }
 439
 440
 441 static void write_psk(FILE *f, struct wpa_ssid *ssid)
 442 {
 443         char *value = wpa_config_get(ssid, "psk");
 444         if (value == NULL)
 445                 return;
 446         fprintf(f, "\tpsk=%s\n", value);
 447         os_free(value);
 448 }
 449
 450
 451 static void write_proto(FILE *f, struct wpa_ssid *ssid)
 452 {
 453         char *value;
 454
 455         if (ssid->proto == DEFAULT_PROTO)
 456                 return;
 457
 458         value = wpa_config_get(ssid, "proto");
 459         if (value == NULL)
 460                 return;
 461         if (value[0])
 462                 fprintf(f, "\tproto=%s\n", value);
 463         os_free(value);
 464 }
 465
 466
 467 static void write_key_mgmt(FILE *f, struct wpa_ssid *ssid)
 468 {
 469         char *value;
 470
 471         if (ssid->key_mgmt == DEFAULT_KEY_MGMT)
 472                 return;
 473
 474         value = wpa_config_get(ssid, "key_mgmt");
 475         if (value == NULL)
 476                 return;
 477         if (value[0])
 478                 fprintf(f, "\tkey_mgmt=%s\n", value);
 479         os_free(value);
 480 }
 481
 482
 483 static void write_pairwise(FILE *f, struct wpa_ssid *ssid)
 484 {
 485         char *value;
 486
 487         if (ssid->pairwise_cipher == DEFAULT_PAIRWISE)
 488                 return;
 489
 490         value = wpa_config_get(ssid, "pairwise");
 491         if (value == NULL)
 492                 return;
 493         if (value[0])
 494                 fprintf(f, "\tpairwise=%s\n", value);
 495         os_free(value);
 496 }
 497
 498
 499 static void write_group(FILE *f, struct wpa_ssid *ssid)
 500 {
 501         char *value;
 502
 503         if (ssid->group_cipher == DEFAULT_GROUP)
 504                 return;
 505
 506         value = wpa_config_get(ssid, "group");
 507         if (value == NULL)
 508                 return;
 509         if (value[0])
 510                 fprintf(f, "\tgroup=%s\n", value);
 511         os_free(value);
 512 }
 513
 514
 515 static void write_auth_alg(FILE *f, struct wpa_ssid *ssid)
 516 {
 517         char *value;
 518
 519         if (ssid->auth_alg == 0)
 520                 return;
 521
 522         value = wpa_config_get(ssid, "auth_alg");
 523         if (value == NULL)
 524                 return;
 525         if (value[0])
 526                 fprintf(f, "\tauth_alg=%s\n", value);
 527         os_free(value);
 528 }
 529
 530
 531 #ifdef IEEE8021X_EAPOL
 532 static void write_eap(FILE *f, struct wpa_ssid *ssid)
 533 {
 534         char *value;
 535
 536         value = wpa_config_get(ssid, "eap");
 537         if (value == NULL)
 538                 return;
 539
 540         if (value[0])
 541                 fprintf(f, "\teap=%s\n", value);
 542         os_free(value);
 543 }
 544 #endif /* IEEE8021X_EAPOL */
 545
 546
 547 static void write_wep_key(FILE *f, int idx, struct wpa_ssid *ssid)
 548 {
 549         char field[20], *value;
 550         int res;
 551
 552         res = os_snprintf(field, sizeof(field), "wep_key%d", idx);
 553         if (res < 0 || (size_t) res >= sizeof(field))
 554                 return;
 555         value = wpa_config_get(ssid, field);
 556         if (value) {
 557                 fprintf(f, "\t%s=%s\n", field, value);
 558                 os_free(value);
 559         }
 560 }
 561
 562
 563 #ifdef CONFIG_P2P
 564 static void write_p2p_client_list(FILE *f, struct wpa_ssid *ssid)
 565 {
 566         char *value = wpa_config_get(ssid, "p2p_client_list");
 567         if (value == NULL)
 568                 return;
 569         fprintf(f, "\tp2p_client_list=%s\n", value);
 570         os_free(value);
 571 }
 572 #endif /* CONFIG_P2P */
 573
 574
 575 static void wpa_config_write_network(FILE *f, struct wpa_ssid *ssid)
 576 {
 577         int i;
 578
 579 #define STR(t) write_str(f, #t, ssid)
 580 #define INT(t) write_int(f, #t, ssid->t, 0)
 581 #define INTe(t) write_int(f, #t, ssid->eap.t, 0)
 582 #define INT_DEF(t, def) write_int(f, #t, ssid->t, def)
 583 #define INT_DEFe(t, def) write_int(f, #t, ssid->eap.t, def)
 584
 585         STR(ssid);
 586         INT(scan_ssid);
 587         write_bssid(f, ssid);
 588         write_psk(f, ssid);
 589         write_proto(f, ssid);
 590         write_key_mgmt(f, ssid);
 591         INT_DEF(bg_scan_period, DEFAULT_BG_SCAN_PERIOD);
 592         write_pairwise(f, ssid);
 593         write_group(f, ssid);
 594         write_auth_alg(f, ssid);
 595         STR(bgscan);
 596 #ifdef IEEE8021X_EAPOL
 597         write_eap(f, ssid);
 598         STR(identity);
 599         STR(anonymous_identity);
 600         STR(password);
 601         STR(ca_cert);
 602         STR(ca_path);
 603         STR(client_cert);
 604         STR(private_key);
 605         STR(private_key_passwd);
 606         STR(dh_file);
 607         STR(subject_match);
 608         STR(altsubject_match);
 609         STR(ca_cert2);
 610         STR(ca_path2);
 611         STR(client_cert2);
 612         STR(private_key2);
 613         STR(private_key2_passwd);
 614         STR(dh_file2);
 615         STR(subject_match2);
 616         STR(altsubject_match2);
 617         STR(phase1);
 618         STR(phase2);
 619         STR(pcsc);
 620         STR(pin);
 621         STR(engine_id);
 622         STR(key_id);
 623         STR(cert_id);
 624         STR(ca_cert_id);
 625         STR(key2_id);
 626         STR(pin2);
 627         STR(engine2_id);
 628         STR(cert2_id);
 629         STR(ca_cert2_id);
 630         INTe(engine);
 631         INTe(engine2);
 632         INT_DEF(eapol_flags, DEFAULT_EAPOL_FLAGS);
 633 #endif /* IEEE8021X_EAPOL */
 634         for (i = 0; i < 4; i++)
 635                 write_wep_key(f, i, ssid);
 636         INT(wep_tx_keyidx);
 637         INT(priority);
 638 #ifdef IEEE8021X_EAPOL
 639         INT_DEF(eap_workaround, DEFAULT_EAP_WORKAROUND);
 640         STR(pac_file);
 641         INT_DEFe(fragment_size, DEFAULT_FRAGMENT_SIZE);
 642 #endif /* IEEE8021X_EAPOL */
 643         INT(mode);
 644         INT(proactive_key_caching);
 645         INT(disabled);
 646         INT(peerkey);
 647 #ifdef CONFIG_IEEE80211W
 648         INT(ieee80211w);
 649 #endif /* CONFIG_IEEE80211W */
 650         STR(id_str);
 651 #ifdef CONFIG_P2P
 652         write_p2p_client_list(f, ssid);
 653 #endif /* CONFIG_P2P */
 654
 655 #undef STR
 656 #undef INT
 657 #undef INT_DEF
 658 }
 659
 660
 661 static void wpa_config_write_cred(FILE *f, struct wpa_cred *cred)
 662 {
 663         if (cred->priority)
 664                 fprintf(f, "\tpriority=%d\n", cred->priority);
 665         if (cred->pcsc)
 666                 fprintf(f, "\tpcsc=%d\n", cred->pcsc);
 667         if (cred->realm)
 668                 fprintf(f, "\trealm=\"%s\"\n", cred->realm);
 669         if (cred->username)
 670                 fprintf(f, "\tusername=\"%s\"\n", cred->username);
 671         if (cred->password)
 672                 fprintf(f, "\tpassword=\"%s\"\n", cred->password);
 673         if (cred->ca_cert)
 674                 fprintf(f, "\tca_cert=\"%s\"\n", cred->ca_cert);
 675         if (cred->imsi)
 676                 fprintf(f, "\timsi=\"%s\"\n", cred->imsi);
 677         if (cred->milenage)
 678                 fprintf(f, "\tmilenage=\"%s\"\n", cred->milenage);
 679         if (cred->domain)
 680                 fprintf(f, "\tdomain=\"%s\"\n", cred->domain);
 681 }
 682
 683
 684 #ifndef CONFIG_NO_CONFIG_BLOBS
 685 static int wpa_config_write_blob(FILE *f, struct wpa_config_blob *blob)
 686 {
 687         unsigned char *encoded;
 688
 689         encoded = base64_encode(blob->data, blob->len, NULL);
 690         if (encoded == NULL)
 691                 return -1;
 692
 693         fprintf(f, "\nblob-base64-%s={\n%s}\n", blob->name, encoded);
 694         os_free(encoded);
 695         return 0;
 696 }
 697 #endif /* CONFIG_NO_CONFIG_BLOBS */
 698
 699
 700 static void wpa_config_write_global(FILE *f, struct wpa_config *config)
 701 {
 702 #ifdef CONFIG_CTRL_IFACE
 703         if (config->ctrl_interface)
 704                 fprintf(f, "ctrl_interface=%s\n", config->ctrl_interface);
 705         if (config->ctrl_interface_group)
 706                 fprintf(f, "ctrl_interface_group=%s\n",
 707                         config->ctrl_interface_group);
 708 #endif /* CONFIG_CTRL_IFACE */
 709         if (config->eapol_version != DEFAULT_EAPOL_VERSION)
 710                 fprintf(f, "eapol_version=%d\n", config->eapol_version);
 711         if (config->ap_scan != DEFAULT_AP_SCAN)
 712                 fprintf(f, "ap_scan=%d\n", config->ap_scan);
 713         if (config->disable_scan_offload)
 714                 fprintf(f, "disable_scan_offload=%d\n",
 715                         config->disable_scan_offload);
 716         if (config->fast_reauth != DEFAULT_FAST_REAUTH)
 717                 fprintf(f, "fast_reauth=%d\n", config->fast_reauth);
 718         if (config->opensc_engine_path)
 719                 fprintf(f, "opensc_engine_path=%s\n",
 720                         config->opensc_engine_path);
 721         if (config->pkcs11_engine_path)
 722                 fprintf(f, "pkcs11_engine_path=%s\n",
 723                         config->pkcs11_engine_path);
 724         if (config->pkcs11_module_path)
 725                 fprintf(f, "pkcs11_module_path=%s\n",
 726                         config->pkcs11_module_path);
 727         if (config->pcsc_reader)
 728                 fprintf(f, "pcsc_reader=%s\n", config->pcsc_reader);
 729         if (config->pcsc_pin)
 730                 fprintf(f, "pcsc_pin=%s\n", config->pcsc_pin);
 731         if (config->driver_param)
 732                 fprintf(f, "driver_param=%s\n", config->driver_param);
 733         if (config->dot11RSNAConfigPMKLifetime)
 734                 fprintf(f, "dot11RSNAConfigPMKLifetime=%d\n",
 735                         config->dot11RSNAConfigPMKLifetime);
 736         if (config->dot11RSNAConfigPMKReauthThreshold)
 737                 fprintf(f, "dot11RSNAConfigPMKReauthThreshold=%d\n",
 738                         config->dot11RSNAConfigPMKReauthThreshold);
 739         if (config->dot11RSNAConfigSATimeout)
 740                 fprintf(f, "dot11RSNAConfigSATimeout=%d\n",
 741                         config->dot11RSNAConfigSATimeout);
 742         if (config->update_config)
 743                 fprintf(f, "update_config=%d\n", config->update_config);
 744 #ifdef CONFIG_WPS
 745         if (!is_nil_uuid(config->uuid)) {
 746                 char buf[40];
 747                 uuid_bin2str(config->uuid, buf, sizeof(buf));
 748                 fprintf(f, "uuid=%s\n", buf);
 749         }
 750         if (config->device_name)
 751                 fprintf(f, "device_name=%s\n", config->device_name);
 752         if (config->manufacturer)
 753                 fprintf(f, "manufacturer=%s\n", config->manufacturer);
 754         if (config->model_name)
 755                 fprintf(f, "model_name=%s\n", config->model_name);
 756         if (config->model_number)
 757                 fprintf(f, "model_number=%s\n", config->model_number);
 758         if (config->serial_number)
 759                 fprintf(f, "serial_number=%s\n", config->serial_number);
 760         {
 761                 char _buf[WPS_DEV_TYPE_BUFSIZE], *buf;
 762                 buf = wps_dev_type_bin2str(config->device_type,
 763                                            _buf, sizeof(_buf));
 764                 if (os_strcmp(buf, "0-00000000-0") != 0)
 765                         fprintf(f, "device_type=%s\n", buf);
 766         }
 767         if (WPA_GET_BE32(config->os_version))
 768                 fprintf(f, "os_version=%08x\n",
 769                         WPA_GET_BE32(config->os_version));
 770         if (config->config_methods)
 771                 fprintf(f, "config_methods=%s\n", config->config_methods);
 772         if (config->wps_cred_processing)
 773                 fprintf(f, "wps_cred_processing=%d\n",
 774                         config->wps_cred_processing);
 775         if (config->wps_vendor_ext_m1) {
 776                 int i, len = wpabuf_len(config->wps_vendor_ext_m1);
 777                 const u8 *p = wpabuf_head_u8(config->wps_vendor_ext_m1);
 778                 if (len > 0) {
 779                         fprintf(f, "wps_vendor_ext_m1=");
 780                         for (i = 0; i < len; i++)
 781                                 fprintf(f, "%02x", *p++);
 782                         fprintf(f, "\n");
 783                 }
 784         }
 785 #endif /* CONFIG_WPS */
 786 #ifdef CONFIG_P2P
 787         if (config->p2p_listen_reg_class)
 788                 fprintf(f, "p2p_listen_reg_class=%u\n",
 789                         config->p2p_listen_reg_class);
 790         if (config->p2p_listen_channel)
 791                 fprintf(f, "p2p_listen_channel=%u\n",
 792                         config->p2p_listen_channel);
 793         if (config->p2p_oper_reg_class)
 794                 fprintf(f, "p2p_oper_reg_class=%u\n",
 795                         config->p2p_oper_reg_class);
 796         if (config->p2p_oper_channel)
 797                 fprintf(f, "p2p_oper_channel=%u\n", config->p2p_oper_channel);
 798         if (config->p2p_go_intent != DEFAULT_P2P_GO_INTENT)
 799                 fprintf(f, "p2p_go_intent=%u\n", config->p2p_go_intent);
 800         if (config->p2p_ssid_postfix)
 801                 fprintf(f, "p2p_ssid_postfix=%s\n", config->p2p_ssid_postfix);
 802         if (config->persistent_reconnect)
 803                 fprintf(f, "persistent_reconnect=%u\n",
 804                         config->persistent_reconnect);
 805         if (config->p2p_intra_bss != DEFAULT_P2P_INTRA_BSS)
 806                 fprintf(f, "p2p_intra_bss=%u\n", config->p2p_intra_bss);
 807         if (config->p2p_group_idle)
 808                 fprintf(f, "p2p_group_idle=%u\n", config->p2p_group_idle);
 809         if (config->p2p_pref_chan) {
 810                 unsigned int i;
 811                 fprintf(f, "p2p_pref_chan=");
 812                 for (i = 0; i < config->num_p2p_pref_chan; i++) {
 813                         fprintf(f, "%s%u:%u", i > 0 ? "," : "",
 814                                 config->p2p_pref_chan[i].op_class,
 815                                 config->p2p_pref_chan[i].chan);
 816                 }
 817                 fprintf(f, "\n");
 818         }
 819 #endif /* CONFIG_P2P */
 820         if (config->country[0] && config->country[1]) {
 821                 fprintf(f, "country=%c%c\n",
 822                         config->country[0], config->country[1]);
 823         }
 824         if (config->bss_max_count != DEFAULT_BSS_MAX_COUNT)
 825                 fprintf(f, "bss_max_count=%u\n", config->bss_max_count);
 826         if (config->bss_expiration_age != DEFAULT_BSS_EXPIRATION_AGE)
 827                 fprintf(f, "bss_expiration_age=%u\n",
 828                         config->bss_expiration_age);
 829         if (config->bss_expiration_scan_count !=
 830             DEFAULT_BSS_EXPIRATION_SCAN_COUNT)
 831                 fprintf(f, "bss_expiration_scan_count=%u\n",
 832                         config->bss_expiration_scan_count);
 833         if (config->filter_ssids)
 834                 fprintf(f, "filter_ssids=%d\n", config->filter_ssids);
 835         if (config->max_num_sta != DEFAULT_MAX_NUM_STA)
 836                 fprintf(f, "max_num_sta=%u\n", config->max_num_sta);
 837         if (config->disassoc_low_ack)
 838                 fprintf(f, "disassoc_low_ack=%u\n", config->disassoc_low_ack);
 839 #ifdef CONFIG_HS20
 840         if (config->hs20)
 841                 fprintf(f, "hs20=1\n");
 842 #endif /* CONFIG_HS20 */
 843 #ifdef CONFIG_INTERWORKING
 844         if (config->interworking)
 845                 fprintf(f, "interworking=%u\n", config->interworking);
 846         if (!is_zero_ether_addr(config->hessid))
 847                 fprintf(f, "hessid=" MACSTR "\n", MAC2STR(config->hessid));
 848         if (config->access_network_type != DEFAULT_ACCESS_NETWORK_TYPE)
 849                 fprintf(f, "access_network_type=%d\n",
 850                         config->access_network_type);
 851 #endif /* CONFIG_INTERWORKING */
 852         if (config->pbc_in_m1)
 853                 fprintf(f, "pbc_in_m1=%u\n", config->pbc_in_m1);
 854 }
 855
 856 #endif /* CONFIG_NO_CONFIG_WRITE */
 857
 858
 859 int wpa_config_write(const char *name, struct wpa_config *config)
 860 {
 861 #ifndef CONFIG_NO_CONFIG_WRITE
 862         FILE *f;
 863         struct wpa_ssid *ssid;
 864         struct wpa_cred *cred;
 865 #ifndef CONFIG_NO_CONFIG_BLOBS
 866         struct wpa_config_blob *blob;
 867 #endif /* CONFIG_NO_CONFIG_BLOBS */
 868         int ret = 0;
 869
 870         wpa_printf(MSG_DEBUG, "Writing configuration file '%s'", name);
 871
 872         f = fopen(name, "w");
 873         if (f == NULL) {
 874                 wpa_printf(MSG_DEBUG, "Failed to open '%s' for writing", name);
 875                 return -1;
 876         }
 877
 878         wpa_config_write_global(f, config);
 879
 880         for (cred = config->cred; cred; cred = cred->next) {
 881                 fprintf(f, "\ncred={\n");
 882                 wpa_config_write_cred(f, cred);
 883                 fprintf(f, "}\n");
 884         }
 885
 886         for (ssid = config->ssid; ssid; ssid = ssid->next) {
 887                 if (ssid->key_mgmt == WPA_KEY_MGMT_WPS || ssid->temporary)
 888                         continue; /* do not save temporary networks */
 889                 if (wpa_key_mgmt_wpa_psk(ssid->key_mgmt) && !ssid->psk_set &&
 890                     !ssid->passphrase)
 891                         continue; /* do not save invalid network */
 892                 fprintf(f, "\nnetwork={\n");
 893                 wpa_config_write_network(f, ssid);
 894                 fprintf(f, "}\n");
 895         }
 896
 897 #ifndef CONFIG_NO_CONFIG_BLOBS
 898         for (blob = config->blobs; blob; blob = blob->next) {
 899                 ret = wpa_config_write_blob(f, blob);
 900                 if (ret)
 901                         break;
 902         }
 903 #endif /* CONFIG_NO_CONFIG_BLOBS */
 904
 905         fclose(f);
 906
 907         wpa_printf(MSG_DEBUG, "Configuration file '%s' written %ssuccessfully",
 908                    name, ret ? "un" : "");
 909         return ret;
 910 #else /* CONFIG_NO_CONFIG_WRITE */
 911         return -1;
 912 #endif /* CONFIG_NO_CONFIG_WRITE */
 913 }