crypto/err/err.c

   1 /*
   2  * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <stdio.h>
  11 #include <stdarg.h>
  12 #include <string.h>
  13 #include "internal/cryptlib_int.h"
  14 #include "internal/err.h"
  15 #include "internal/err_int.h"
  16 #include <openssl/err.h>
  17 #include <openssl/crypto.h>
  18 #include <openssl/buffer.h>
  19 #include <openssl/bio.h>
  20 #include <openssl/opensslconf.h>
  21 #include "internal/thread_once.h"
  22
  23 static int err_load_strings(const ERR_STRING_DATA *str);
  24
  25 static void ERR_STATE_free(ERR_STATE *s);
  26 #ifndef OPENSSL_NO_ERR
  27 static ERR_STRING_DATA ERR_str_libraries[] = {
  28     {ERR_PACK(ERR_LIB_NONE, 0, 0), "unknown library"},
  29     {ERR_PACK(ERR_LIB_SYS, 0, 0), "system library"},
  30     {ERR_PACK(ERR_LIB_BN, 0, 0), "bignum routines"},
  31     {ERR_PACK(ERR_LIB_RSA, 0, 0), "rsa routines"},
  32     {ERR_PACK(ERR_LIB_DH, 0, 0), "Diffie-Hellman routines"},
  33     {ERR_PACK(ERR_LIB_EVP, 0, 0), "digital envelope routines"},
  34     {ERR_PACK(ERR_LIB_BUF, 0, 0), "memory buffer routines"},
  35     {ERR_PACK(ERR_LIB_OBJ, 0, 0), "object identifier routines"},
  36     {ERR_PACK(ERR_LIB_PEM, 0, 0), "PEM routines"},
  37     {ERR_PACK(ERR_LIB_DSA, 0, 0), "dsa routines"},
  38     {ERR_PACK(ERR_LIB_X509, 0, 0), "x509 certificate routines"},
  39     {ERR_PACK(ERR_LIB_ASN1, 0, 0), "asn1 encoding routines"},
  40     {ERR_PACK(ERR_LIB_CONF, 0, 0), "configuration file routines"},
  41     {ERR_PACK(ERR_LIB_CRYPTO, 0, 0), "common libcrypto routines"},
  42     {ERR_PACK(ERR_LIB_EC, 0, 0), "elliptic curve routines"},
  43     {ERR_PACK(ERR_LIB_ECDSA, 0, 0), "ECDSA routines"},
  44     {ERR_PACK(ERR_LIB_ECDH, 0, 0), "ECDH routines"},
  45     {ERR_PACK(ERR_LIB_SSL, 0, 0), "SSL routines"},
  46     {ERR_PACK(ERR_LIB_BIO, 0, 0), "BIO routines"},
  47     {ERR_PACK(ERR_LIB_PKCS7, 0, 0), "PKCS7 routines"},
  48     {ERR_PACK(ERR_LIB_X509V3, 0, 0), "X509 V3 routines"},
  49     {ERR_PACK(ERR_LIB_PKCS12, 0, 0), "PKCS12 routines"},
  50     {ERR_PACK(ERR_LIB_RAND, 0, 0), "random number generator"},
  51     {ERR_PACK(ERR_LIB_DSO, 0, 0), "DSO support routines"},
  52     {ERR_PACK(ERR_LIB_TS, 0, 0), "time stamp routines"},
  53     {ERR_PACK(ERR_LIB_ENGINE, 0, 0), "engine routines"},
  54     {ERR_PACK(ERR_LIB_OCSP, 0, 0), "OCSP routines"},
  55     {ERR_PACK(ERR_LIB_UI, 0, 0), "UI routines"},
  56     {ERR_PACK(ERR_LIB_FIPS, 0, 0), "FIPS routines"},
  57     {ERR_PACK(ERR_LIB_CMS, 0, 0), "CMS routines"},
  58     {ERR_PACK(ERR_LIB_HMAC, 0, 0), "HMAC routines"},
  59     {ERR_PACK(ERR_LIB_CT, 0, 0), "CT routines"},
  60     {ERR_PACK(ERR_LIB_ASYNC, 0, 0), "ASYNC routines"},
  61     {ERR_PACK(ERR_LIB_KDF, 0, 0), "KDF routines"},
  62     {ERR_PACK(ERR_LIB_OSSL_STORE, 0, 0), "STORE routines"},
  63     {ERR_PACK(ERR_LIB_SM2, 0, 0), "SM2 routines"},
  64     {0, NULL},
  65 };
  66
  67 static ERR_STRING_DATA ERR_str_functs[] = {
  68     {ERR_PACK(0, SYS_F_FOPEN, 0), "fopen"},
  69     {ERR_PACK(0, SYS_F_CONNECT, 0), "connect"},
  70     {ERR_PACK(0, SYS_F_GETSERVBYNAME, 0), "getservbyname"},
  71     {ERR_PACK(0, SYS_F_SOCKET, 0), "socket"},
  72     {ERR_PACK(0, SYS_F_IOCTLSOCKET, 0), "ioctlsocket"},
  73     {ERR_PACK(0, SYS_F_BIND, 0), "bind"},
  74     {ERR_PACK(0, SYS_F_LISTEN, 0), "listen"},
  75     {ERR_PACK(0, SYS_F_ACCEPT, 0), "accept"},
  76 # ifdef OPENSSL_SYS_WINDOWS
  77     {ERR_PACK(0, SYS_F_WSASTARTUP, 0), "WSAstartup"},
  78 # endif
  79     {ERR_PACK(0, SYS_F_OPENDIR, 0), "opendir"},
  80     {ERR_PACK(0, SYS_F_FREAD, 0), "fread"},
  81     {ERR_PACK(0, SYS_F_GETADDRINFO, 0), "getaddrinfo"},
  82     {ERR_PACK(0, SYS_F_GETNAMEINFO, 0), "getnameinfo"},
  83     {ERR_PACK(0, SYS_F_SETSOCKOPT, 0), "setsockopt"},
  84     {ERR_PACK(0, SYS_F_GETSOCKOPT, 0), "getsockopt"},
  85     {ERR_PACK(0, SYS_F_GETSOCKNAME, 0), "getsockname"},
  86     {ERR_PACK(0, SYS_F_GETHOSTBYNAME, 0), "gethostbyname"},
  87     {ERR_PACK(0, SYS_F_FFLUSH, 0), "fflush"},
  88     {ERR_PACK(0, SYS_F_OPEN, 0), "open"},
  89     {ERR_PACK(0, SYS_F_CLOSE, 0), "close"},
  90     {ERR_PACK(0, SYS_F_IOCTL, 0), "ioctl"},
  91     {ERR_PACK(0, SYS_F_STAT, 0), "stat"},
  92     {ERR_PACK(0, SYS_F_FCNTL, 0), "fcntl"},
  93     {ERR_PACK(0, SYS_F_FSTAT, 0), "fstat"},
  94     {0, NULL},
  95 };
  96
  97 static ERR_STRING_DATA ERR_str_reasons[] = {
  98     {ERR_R_SYS_LIB, "system lib"},
  99     {ERR_R_BN_LIB, "BN lib"},
 100     {ERR_R_RSA_LIB, "RSA lib"},
 101     {ERR_R_DH_LIB, "DH lib"},
 102     {ERR_R_EVP_LIB, "EVP lib"},
 103     {ERR_R_BUF_LIB, "BUF lib"},
 104     {ERR_R_OBJ_LIB, "OBJ lib"},
 105     {ERR_R_PEM_LIB, "PEM lib"},
 106     {ERR_R_DSA_LIB, "DSA lib"},
 107     {ERR_R_X509_LIB, "X509 lib"},
 108     {ERR_R_ASN1_LIB, "ASN1 lib"},
 109     {ERR_R_EC_LIB, "EC lib"},
 110     {ERR_R_BIO_LIB, "BIO lib"},
 111     {ERR_R_PKCS7_LIB, "PKCS7 lib"},
 112     {ERR_R_X509V3_LIB, "X509V3 lib"},
 113     {ERR_R_ENGINE_LIB, "ENGINE lib"},
 114     {ERR_R_UI_LIB, "UI lib"},
 115     {ERR_R_OSSL_STORE_LIB, "STORE lib"},
 116     {ERR_R_ECDSA_LIB, "ECDSA lib"},
 117
 118     {ERR_R_NESTED_ASN1_ERROR, "nested asn1 error"},
 119     {ERR_R_MISSING_ASN1_EOS, "missing asn1 eos"},
 120
 121     {ERR_R_FATAL, "fatal"},
 122     {ERR_R_MALLOC_FAILURE, "malloc failure"},
 123     {ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED,
 124      "called a function you should not call"},
 125     {ERR_R_PASSED_NULL_PARAMETER, "passed a null parameter"},
 126     {ERR_R_INTERNAL_ERROR, "internal error"},
 127     {ERR_R_DISABLED, "called a function that was disabled at compile-time"},
 128     {ERR_R_INIT_FAIL, "init fail"},
 129     {ERR_R_OPERATION_FAIL, "operation fail"},
 130
 131     {0, NULL},
 132 };
 133 #endif
 134
 135 static CRYPTO_ONCE err_init = CRYPTO_ONCE_STATIC_INIT;
 136 static int set_err_thread_local;
 137 static CRYPTO_THREAD_LOCAL err_thread_local;
 138
 139 static CRYPTO_ONCE err_string_init = CRYPTO_ONCE_STATIC_INIT;
 140 static CRYPTO_RWLOCK *err_string_lock;
 141
 142 static ERR_STRING_DATA *int_err_get_item(const ERR_STRING_DATA *);
 143
 144 /*
 145  * The internal state
 146  */
 147
 148 static LHASH_OF(ERR_STRING_DATA) *int_error_hash = NULL;
 149 static int int_err_library_number = ERR_LIB_USER;
 150
 151 static unsigned long get_error_values(int inc, int top, const char **file,
 152                                       int *line, const char **data,
 153                                       int *flags);
 154
 155 static unsigned long err_string_data_hash(const ERR_STRING_DATA *a)
 156 {
 157     unsigned long ret, l;
 158
 159     l = a->error;
 160     ret = l ^ ERR_GET_LIB(l) ^ ERR_GET_FUNC(l);
 161     return (ret ^ ret % 19 * 13);
 162 }
 163
 164 static int err_string_data_cmp(const ERR_STRING_DATA *a,
 165                                const ERR_STRING_DATA *b)
 166 {
 167     if (a->error == b->error)
 168         return 0;
 169     return a->error > b->error ? 1 : -1;
 170 }
 171
 172 static ERR_STRING_DATA *int_err_get_item(const ERR_STRING_DATA *d)
 173 {
 174     ERR_STRING_DATA *p = NULL;
 175
 176     CRYPTO_THREAD_read_lock(err_string_lock);
 177     p = lh_ERR_STRING_DATA_retrieve(int_error_hash, d);
 178     CRYPTO_THREAD_unlock(err_string_lock);
 179
 180     return p;
 181 }
 182
 183 #ifndef OPENSSL_NO_ERR
 184 # define NUM_SYS_STR_REASONS 127
 185 # define LEN_SYS_STR_REASON 32
 186
 187 static ERR_STRING_DATA SYS_str_reasons[NUM_SYS_STR_REASONS + 1];
 188 /*
 189  * SYS_str_reasons is filled with copies of strerror() results at
 190  * initialization. 'errno' values up to 127 should cover all usual errors,
 191  * others will be displayed numerically by ERR_error_string. It is crucial
 192  * that we have something for each reason code that occurs in
 193  * ERR_str_reasons, or bogus reason strings will be returned for SYSerr(),
 194  * which always gets an errno value and never one of those 'standard' reason
 195  * codes.
 196  */
 197
 198 static void build_SYS_str_reasons(void)
 199 {
 200     /* OPENSSL_malloc cannot be used here, use static storage instead */
 201     static char strerror_tab[NUM_SYS_STR_REASONS][LEN_SYS_STR_REASON];
 202     static int init = 1;
 203     int i;
 204
 205     CRYPTO_THREAD_write_lock(err_string_lock);
 206     if (!init) {
 207         CRYPTO_THREAD_unlock(err_string_lock);
 208         return;
 209     }
 210
 211     for (i = 1; i <= NUM_SYS_STR_REASONS; i++) {
 212         ERR_STRING_DATA *str = &SYS_str_reasons[i - 1];
 213
 214         str->error = ERR_PACK(ERR_LIB_SYS, 0, i);
 215         if (str->string == NULL) {
 216             char (*dest)[LEN_SYS_STR_REASON] = &(strerror_tab[i - 1]);
 217             if (openssl_strerror_r(i, *dest, sizeof(*dest)))
 218                 str->string = *dest;
 219         }
 220         if (str->string == NULL)
 221             str->string = "unknown";
 222     }
 223
 224     /*
 225      * Now we still have SYS_str_reasons[NUM_SYS_STR_REASONS] = {0, NULL}, as
 226      * required by ERR_load_strings.
 227      */
 228
 229     init = 0;
 230
 231     CRYPTO_THREAD_unlock(err_string_lock);
 232     err_load_strings(SYS_str_reasons);
 233 }
 234 #endif
 235
 236 #define err_clear_data(p, i) \
 237         do { \
 238             if ((p)->err_data_flags[i] & ERR_TXT_MALLOCED) {\
 239                 OPENSSL_free((p)->err_data[i]); \
 240                 (p)->err_data[i] = NULL; \
 241             } \
 242             (p)->err_data_flags[i] = 0; \
 243         } while (0)
 244
 245 #define err_clear(p, i) \
 246         do { \
 247             err_clear_data(p, i); \
 248             (p)->err_flags[i] = 0; \
 249             (p)->err_buffer[i] = 0; \
 250             (p)->err_file[i] = NULL; \
 251             (p)->err_line[i] = -1; \
 252         } while (0)
 253
 254 static void ERR_STATE_free(ERR_STATE *s)
 255 {
 256     int i;
 257
 258     if (s == NULL)
 259         return;
 260     for (i = 0; i < ERR_NUM_ERRORS; i++) {
 261         err_clear_data(s, i);
 262     }
 263     OPENSSL_free(s);
 264 }
 265
 266 DEFINE_RUN_ONCE_STATIC(do_err_strings_init)
 267 {
 268     OPENSSL_init_crypto(0, NULL);
 269     err_string_lock = CRYPTO_THREAD_lock_new();
 270     int_error_hash = lh_ERR_STRING_DATA_new(err_string_data_hash,
 271                                             err_string_data_cmp);
 272     return err_string_lock != NULL && int_error_hash != NULL;
 273 }
 274
 275 void err_cleanup(void)
 276 {
 277     if (set_err_thread_local != 0)
 278         CRYPTO_THREAD_cleanup_local(&err_thread_local);
 279     CRYPTO_THREAD_lock_free(err_string_lock);
 280     err_string_lock = NULL;
 281     lh_ERR_STRING_DATA_free(int_error_hash);
 282     int_error_hash = NULL;
 283 }
 284
 285 /*
 286  * Legacy; pack in the library.
 287  */
 288 static void err_patch(int lib, ERR_STRING_DATA *str)
 289 {
 290     unsigned long plib = ERR_PACK(lib, 0, 0);
 291
 292     for (; str->error != 0; str++)
 293         str->error |= plib;
 294 }
 295
 296 /*
 297  * Hash in |str| error strings. Assumes the URN_ONCE was done.
 298  */
 299 static int err_load_strings(const ERR_STRING_DATA *str)
 300 {
 301     CRYPTO_THREAD_write_lock(err_string_lock);
 302     for (; str->error; str++)
 303         (void)lh_ERR_STRING_DATA_insert(int_error_hash,
 304                                        (ERR_STRING_DATA *)str);
 305     CRYPTO_THREAD_unlock(err_string_lock);
 306     return 1;
 307 }
 308
 309 int ERR_load_ERR_strings(void)
 310 {
 311 #ifndef OPENSSL_NO_ERR
 312     if (!RUN_ONCE(&err_string_init, do_err_strings_init))
 313         return 0;
 314
 315     err_load_strings(ERR_str_libraries);
 316     err_load_strings(ERR_str_reasons);
 317     err_patch(ERR_LIB_SYS, ERR_str_functs);
 318     err_load_strings(ERR_str_functs);
 319     build_SYS_str_reasons();
 320 #endif
 321     return 1;
 322 }
 323
 324 int ERR_load_strings(int lib, ERR_STRING_DATA *str)
 325 {
 326     if (ERR_load_ERR_strings() == 0)
 327         return 0;
 328
 329     err_patch(lib, str);
 330     err_load_strings(str);
 331     return 1;
 332 }
 333
 334 int ERR_load_strings_const(const ERR_STRING_DATA *str)
 335 {
 336     if (ERR_load_ERR_strings() == 0)
 337         return 0;
 338     err_load_strings(str);
 339     return 1;
 340 }
 341
 342 int ERR_unload_strings(int lib, ERR_STRING_DATA *str)
 343 {
 344     if (!RUN_ONCE(&err_string_init, do_err_strings_init))
 345         return 0;
 346
 347     CRYPTO_THREAD_write_lock(err_string_lock);
 348     /*
 349      * We don't need to ERR_PACK the lib, since that was done (to
 350      * the table) when it was loaded.
 351      */
 352     for (; str->error; str++)
 353         (void)lh_ERR_STRING_DATA_delete(int_error_hash, str);
 354     CRYPTO_THREAD_unlock(err_string_lock);
 355
 356     return 1;
 357 }
 358
 359 void err_free_strings_int(void)
 360 {
 361     if (!RUN_ONCE(&err_string_init, do_err_strings_init))
 362         return;
 363 }
 364
 365 /********************************************************/
 366
 367 void ERR_put_error(int lib, int func, int reason, const char *file, int line)
 368 {
 369     ERR_STATE *es;
 370
 371 #ifdef _OSD_POSIX
 372     /*
 373      * In the BS2000-OSD POSIX subsystem, the compiler generates path names
 374      * in the form "*POSIX(/etc/passwd)". This dirty hack strips them to
 375      * something sensible. @@@ We shouldn't modify a const string, though.
 376      */
 377     if (strncmp(file, "*POSIX(", sizeof("*POSIX(") - 1) == 0) {
 378         char *end;
 379
 380         /* Skip the "*POSIX(" prefix */
 381         file += sizeof("*POSIX(") - 1;
 382         end = &file[strlen(file) - 1];
 383         if (*end == ')')
 384             *end = '\0';
 385         /* Optional: use the basename of the path only. */
 386         if ((end = strrchr(file, '/')) != NULL)
 387             file = &end[1];
 388     }
 389 #endif
 390     es = ERR_get_state();
 391     if (es == NULL)
 392         return;
 393
 394     es->top = (es->top + 1) % ERR_NUM_ERRORS;
 395     if (es->top == es->bottom)
 396         es->bottom = (es->bottom + 1) % ERR_NUM_ERRORS;
 397     es->err_flags[es->top] = 0;
 398     es->err_buffer[es->top] = ERR_PACK(lib, func, reason);
 399     es->err_file[es->top] = file;
 400     es->err_line[es->top] = line;
 401     err_clear_data(es, es->top);
 402 }
 403
 404 void ERR_clear_error(void)
 405 {
 406     int i;
 407     ERR_STATE *es;
 408
 409     es = ERR_get_state();
 410     if (es == NULL)
 411         return;
 412
 413     for (i = 0; i < ERR_NUM_ERRORS; i++) {
 414         err_clear(es, i);
 415     }
 416     es->top = es->bottom = 0;
 417 }
 418
 419 unsigned long ERR_get_error(void)
 420 {
 421     return get_error_values(1, 0, NULL, NULL, NULL, NULL);
 422 }
 423
 424 unsigned long ERR_get_error_line(const char **file, int *line)
 425 {
 426     return get_error_values(1, 0, file, line, NULL, NULL);
 427 }
 428
 429 unsigned long ERR_get_error_line_data(const char **file, int *line,
 430                                       const char **data, int *flags)
 431 {
 432     return get_error_values(1, 0, file, line, data, flags);
 433 }
 434
 435 unsigned long ERR_peek_error(void)
 436 {
 437     return get_error_values(0, 0, NULL, NULL, NULL, NULL);
 438 }
 439
 440 unsigned long ERR_peek_error_line(const char **file, int *line)
 441 {
 442     return get_error_values(0, 0, file, line, NULL, NULL);
 443 }
 444
 445 unsigned long ERR_peek_error_line_data(const char **file, int *line,
 446                                        const char **data, int *flags)
 447 {
 448     return get_error_values(0, 0, file, line, data, flags);
 449 }
 450
 451 unsigned long ERR_peek_last_error(void)
 452 {
 453     return get_error_values(0, 1, NULL, NULL, NULL, NULL);
 454 }
 455
 456 unsigned long ERR_peek_last_error_line(const char **file, int *line)
 457 {
 458     return get_error_values(0, 1, file, line, NULL, NULL);
 459 }
 460
 461 unsigned long ERR_peek_last_error_line_data(const char **file, int *line,
 462                                             const char **data, int *flags)
 463 {
 464     return get_error_values(0, 1, file, line, data, flags);
 465 }
 466
 467 static unsigned long get_error_values(int inc, int top, const char **file,
 468                                       int *line, const char **data,
 469                                       int *flags)
 470 {
 471     int i = 0;
 472     ERR_STATE *es;
 473     unsigned long ret;
 474
 475     es = ERR_get_state();
 476     if (es == NULL)
 477         return 0;
 478
 479     if (inc && top) {
 480         if (file)
 481             *file = "";
 482         if (line)
 483             *line = 0;
 484         if (data)
 485             *data = "";
 486         if (flags)
 487             *flags = 0;
 488
 489         return ERR_R_INTERNAL_ERROR;
 490     }
 491
 492     if (es->bottom == es->top)
 493         return 0;
 494     if (top)
 495         i = es->top;            /* last error */
 496     else
 497         i = (es->bottom + 1) % ERR_NUM_ERRORS; /* first error */
 498
 499     ret = es->err_buffer[i];
 500     if (inc) {
 501         es->bottom = i;
 502         es->err_buffer[i] = 0;
 503     }
 504
 505     if (file != NULL && line != NULL) {
 506         if (es->err_file[i] == NULL) {
 507             *file = "NA";
 508             *line = 0;
 509         } else {
 510             *file = es->err_file[i];
 511             *line = es->err_line[i];
 512         }
 513     }
 514
 515     if (data == NULL) {
 516         if (inc) {
 517             err_clear_data(es, i);
 518         }
 519     } else {
 520         if (es->err_data[i] == NULL) {
 521             *data = "";
 522             if (flags != NULL)
 523                 *flags = 0;
 524         } else {
 525             *data = es->err_data[i];
 526             if (flags != NULL)
 527                 *flags = es->err_data_flags[i];
 528         }
 529     }
 530     return ret;
 531 }
 532
 533 void ERR_error_string_n(unsigned long e, char *buf, size_t len)
 534 {
 535     char lsbuf[64], fsbuf[64], rsbuf[64];
 536     const char *ls, *fs, *rs;
 537     unsigned long l, f, r;
 538
 539     if (len == 0)
 540         return;
 541
 542     l = ERR_GET_LIB(e);
 543     ls = ERR_lib_error_string(e);
 544     if (ls == NULL) {
 545         BIO_snprintf(lsbuf, sizeof(lsbuf), "lib(%lu)", l);
 546         ls = lsbuf;
 547     }
 548
 549     fs = ERR_func_error_string(e);
 550     f = ERR_GET_FUNC(e);
 551     if (fs == NULL) {
 552         BIO_snprintf(fsbuf, sizeof(fsbuf), "func(%lu)", f);
 553         fs = fsbuf;
 554     }
 555
 556     rs = ERR_reason_error_string(e);
 557     r = ERR_GET_REASON(e);
 558     if (rs == NULL) {
 559         BIO_snprintf(rsbuf, sizeof(rsbuf), "reason(%lu)", r);
 560         rs = rsbuf;
 561     }
 562
 563     BIO_snprintf(buf, len, "error:%08lX:%s:%s:%s", e, ls, fs, rs);
 564     if (strlen(buf) == len - 1) {
 565         /* Didn't fit; use a minimal format. */
 566         BIO_snprintf(buf, len, "err:%lx:%lx:%lx:%lx", e, l, f, r);
 567     }
 568 }
 569
 570 /*
 571  * ERR_error_string_n should be used instead for ret != NULL as
 572  * ERR_error_string cannot know how large the buffer is
 573  */
 574 char *ERR_error_string(unsigned long e, char *ret)
 575 {
 576     static char buf[256];
 577
 578     if (ret == NULL)
 579         ret = buf;
 580     ERR_error_string_n(e, ret, (int)sizeof(buf));
 581     return ret;
 582 }
 583
 584 const char *ERR_lib_error_string(unsigned long e)
 585 {
 586     ERR_STRING_DATA d, *p;
 587     unsigned long l;
 588
 589     if (!RUN_ONCE(&err_string_init, do_err_strings_init)) {
 590         return NULL;
 591     }
 592
 593     l = ERR_GET_LIB(e);
 594     d.error = ERR_PACK(l, 0, 0);
 595     p = int_err_get_item(&d);
 596     return ((p == NULL) ? NULL : p->string);
 597 }
 598
 599 const char *ERR_func_error_string(unsigned long e)
 600 {
 601     ERR_STRING_DATA d, *p;
 602     unsigned long l, f;
 603
 604     if (!RUN_ONCE(&err_string_init, do_err_strings_init)) {
 605         return NULL;
 606     }
 607
 608     l = ERR_GET_LIB(e);
 609     f = ERR_GET_FUNC(e);
 610     d.error = ERR_PACK(l, f, 0);
 611     p = int_err_get_item(&d);
 612     return ((p == NULL) ? NULL : p->string);
 613 }
 614
 615 const char *ERR_reason_error_string(unsigned long e)
 616 {
 617     ERR_STRING_DATA d, *p = NULL;
 618     unsigned long l, r;
 619
 620     if (!RUN_ONCE(&err_string_init, do_err_strings_init)) {
 621         return NULL;
 622     }
 623
 624     l = ERR_GET_LIB(e);
 625     r = ERR_GET_REASON(e);
 626     d.error = ERR_PACK(l, 0, r);
 627     p = int_err_get_item(&d);
 628     if (!p) {
 629         d.error = ERR_PACK(0, 0, r);
 630         p = int_err_get_item(&d);
 631     }
 632     return ((p == NULL) ? NULL : p->string);
 633 }
 634
 635 void err_delete_thread_state(void)
 636 {
 637     ERR_STATE *state = CRYPTO_THREAD_get_local(&err_thread_local);
 638     if (state == NULL)
 639         return;
 640
 641     CRYPTO_THREAD_set_local(&err_thread_local, NULL);
 642     ERR_STATE_free(state);
 643 }
 644
 645 #if OPENSSL_API_COMPAT < 0x10100000L
 646 void ERR_remove_thread_state(void *dummy)
 647 {
 648 }
 649 #endif
 650
 651 #if OPENSSL_API_COMPAT < 0x10000000L
 652 void ERR_remove_state(unsigned long pid)
 653 {
 654 }
 655 #endif
 656
 657 DEFINE_RUN_ONCE_STATIC(err_do_init)
 658 {
 659     set_err_thread_local = 1;
 660     return CRYPTO_THREAD_init_local(&err_thread_local, NULL);
 661 }
 662
 663 ERR_STATE *ERR_get_state(void)
 664 {
 665     ERR_STATE *state = NULL;
 666
 667     if (!RUN_ONCE(&err_init, err_do_init))
 668         return NULL;
 669
 670     /*
 671      * If base OPENSSL_init_crypto() hasn't been called yet, be sure to call
 672      * it now to avoid state to be doubly allocated and thereby leak memory.
 673      * Needed on any platform that doesn't define OPENSSL_USE_NODELETE.
 674      */
 675     if (!OPENSSL_init_crypto(0, NULL))
 676         return NULL;
 677
 678     state = CRYPTO_THREAD_get_local(&err_thread_local);
 679
 680     if (state == NULL) {
 681         state = OPENSSL_zalloc(sizeof(*state));
 682         if (state == NULL)
 683             return NULL;
 684
 685         if (!ossl_init_thread_start(OPENSSL_INIT_THREAD_ERR_STATE)
 686             || !CRYPTO_THREAD_set_local(&err_thread_local, state)) {
 687             ERR_STATE_free(state);
 688             return NULL;
 689         }
 690
 691         /* Ignore failures from these */
 692         OPENSSL_init_crypto(OPENSSL_INIT_LOAD_CRYPTO_STRINGS, NULL);
 693     }
 694
 695     return state;
 696 }
 697
 698 int ERR_get_next_error_library(void)
 699 {
 700     int ret;
 701
 702     if (!RUN_ONCE(&err_string_init, do_err_strings_init)) {
 703         return 0;
 704     }
 705
 706     CRYPTO_THREAD_write_lock(err_string_lock);
 707     ret = int_err_library_number++;
 708     CRYPTO_THREAD_unlock(err_string_lock);
 709     return ret;
 710 }
 711
 712 void ERR_set_error_data(char *data, int flags)
 713 {
 714     ERR_STATE *es;
 715     int i;
 716
 717     es = ERR_get_state();
 718     if (es == NULL)
 719         return;
 720
 721     i = es->top;
 722
 723     err_clear_data(es, i);
 724     es->err_data[i] = data;
 725     es->err_data_flags[i] = flags;
 726 }
 727
 728 void ERR_add_error_data(int num, ...)
 729 {
 730     va_list args;
 731     va_start(args, num);
 732     ERR_add_error_vdata(num, args);
 733     va_end(args);
 734 }
 735
 736 void ERR_add_error_vdata(int num, va_list args)
 737 {
 738     int i, n, s;
 739     char *str, *p, *a;
 740
 741     s = 80;
 742     str = OPENSSL_malloc(s + 1);
 743     if (str == NULL)
 744         return;
 745     str[0] = '\0';
 746
 747     n = 0;
 748     for (i = 0; i < num; i++) {
 749         a = va_arg(args, char *);
 750         if (a == NULL)
 751             a = "<NULL>";
 752         n += strlen(a);
 753         if (n > s) {
 754             s = n + 20;
 755             p = OPENSSL_realloc(str, s + 1);
 756             if (p == NULL) {
 757                 OPENSSL_free(str);
 758                 return;
 759             }
 760             str = p;
 761         }
 762         OPENSSL_strlcat(str, a, (size_t)s + 1);
 763     }
 764     ERR_set_error_data(str, ERR_TXT_MALLOCED | ERR_TXT_STRING);
 765 }
 766
 767 int ERR_set_mark(void)
 768 {
 769     ERR_STATE *es;
 770
 771     es = ERR_get_state();
 772     if (es == NULL)
 773         return 0;
 774
 775     if (es->bottom == es->top)
 776         return 0;
 777     es->err_flags[es->top] |= ERR_FLAG_MARK;
 778     return 1;
 779 }
 780
 781 int ERR_pop_to_mark(void)
 782 {
 783     ERR_STATE *es;
 784
 785     es = ERR_get_state();
 786     if (es == NULL)
 787         return 0;
 788
 789     while (es->bottom != es->top
 790            && (es->err_flags[es->top] & ERR_FLAG_MARK) == 0) {
 791         err_clear(es, es->top);
 792         es->top = es->top > 0 ? es->top - 1 : ERR_NUM_ERRORS - 1;
 793     }
 794
 795     if (es->bottom == es->top)
 796         return 0;
 797     es->err_flags[es->top] &= ~ERR_FLAG_MARK;
 798     return 1;
 799 }
 800
 801 int ERR_clear_last_mark(void)
 802 {
 803     ERR_STATE *es;
 804     int top;
 805
 806     es = ERR_get_state();
 807     if (es == NULL)
 808         return 0;
 809
 810     top = es->top;
 811     while (es->bottom != top
 812            && (es->err_flags[top] & ERR_FLAG_MARK) == 0) {
 813         top = top > 0 ? top - 1 : ERR_NUM_ERRORS - 1;
 814     }
 815
 816     if (es->bottom == top)
 817         return 0;
 818     es->err_flags[top] &= ~ERR_FLAG_MARK;
 819     return 1;
 820 }