Merge commit 'dfc115332c94a2f62058ac7f2bce7631fbd20b3d'

[unleashed/tickless.git] / lib / libcrypto / err / err.c

/* $OpenBSD: err.c,v 1.45 2017/02/20 23:21:19 beck Exp $ */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 *
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 *
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 *
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */
/* ====================================================================
 * Copyright (c) 1998-2006 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    openssl-core@openssl.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */

#include <stdarg.h>
#include <stdio.h>
#include <string.h>

#include <openssl/opensslconf.h>

#include <openssl/bio.h>
#include <openssl/buffer.h>
#include <openssl/crypto.h>
#include <openssl/err.h>
#include <openssl/lhash.h>

DECLARE_LHASH_OF(ERR_STRING_DATA);
DECLARE_LHASH_OF(ERR_STATE);

static void err_load_strings(int lib, ERR_STRING_DATA *str);

static void ERR_STATE_free(ERR_STATE *s);
#ifndef OPENSSL_NO_ERR
static ERR_STRING_DATA ERR_str_libraries[] = {
        {ERR_PACK(ERR_LIB_NONE,0,0),            "unknown library"},
        {ERR_PACK(ERR_LIB_SYS,0,0),             "system library"},
        {ERR_PACK(ERR_LIB_BN,0,0),              "bignum routines"},
        {ERR_PACK(ERR_LIB_RSA,0,0),             "rsa routines"},
        {ERR_PACK(ERR_LIB_DH,0,0),              "Diffie-Hellman routines"},
        {ERR_PACK(ERR_LIB_EVP,0,0),             "digital envelope routines"},
        {ERR_PACK(ERR_LIB_BUF,0,0),             "memory buffer routines"},
        {ERR_PACK(ERR_LIB_OBJ,0,0),             "object identifier routines"},
        {ERR_PACK(ERR_LIB_PEM,0,0),             "PEM routines"},
        {ERR_PACK(ERR_LIB_DSA,0,0),             "dsa routines"},
        {ERR_PACK(ERR_LIB_X509,0,0),            "x509 certificate routines"},
        {ERR_PACK(ERR_LIB_ASN1,0,0),            "asn1 encoding routines"},
        {ERR_PACK(ERR_LIB_CONF,0,0),            "configuration file routines"},
        {ERR_PACK(ERR_LIB_CRYPTO,0,0),          "common libcrypto routines"},
        {ERR_PACK(ERR_LIB_EC,0,0),              "elliptic curve routines"},
        {ERR_PACK(ERR_LIB_SSL,0,0),             "SSL routines"},
        {ERR_PACK(ERR_LIB_BIO,0,0),             "BIO routines"},
        {ERR_PACK(ERR_LIB_PKCS7,0,0),           "PKCS7 routines"},
        {ERR_PACK(ERR_LIB_X509V3,0,0),          "X509 V3 routines"},
        {ERR_PACK(ERR_LIB_PKCS12,0,0),          "PKCS12 routines"},
        {ERR_PACK(ERR_LIB_RAND,0,0),            "random number generator"},
        {ERR_PACK(ERR_LIB_DSO,0,0),             "DSO support routines"},
        {ERR_PACK(ERR_LIB_TS,0,0),              "time stamp routines"},
        {ERR_PACK(ERR_LIB_ENGINE,0,0),          "engine routines"},
        {ERR_PACK(ERR_LIB_OCSP,0,0),            "OCSP routines"},
        {ERR_PACK(ERR_LIB_FIPS,0,0),            "FIPS routines"},
        {ERR_PACK(ERR_LIB_CMS,0,0),             "CMS routines"},
        {ERR_PACK(ERR_LIB_HMAC,0,0),            "HMAC routines"},
        {ERR_PACK(ERR_LIB_GOST,0,0),            "GOST routines"},
        {0, NULL},
};

static ERR_STRING_DATA ERR_str_functs[] = {
        {ERR_PACK(0,SYS_F_FOPEN, 0),            "fopen"},
        {ERR_PACK(0,SYS_F_CONNECT, 0),          "connect"},
        {ERR_PACK(0,SYS_F_GETSERVBYNAME, 0),    "getservbyname"},
        {ERR_PACK(0,SYS_F_SOCKET, 0),           "socket"},
        {ERR_PACK(0,SYS_F_IOCTLSOCKET, 0),      "ioctl"},
        {ERR_PACK(0,SYS_F_BIND, 0),             "bind"},
        {ERR_PACK(0,SYS_F_LISTEN, 0),           "listen"},
        {ERR_PACK(0,SYS_F_ACCEPT, 0),           "accept"},
        {ERR_PACK(0,SYS_F_OPENDIR, 0),          "opendir"},
        {ERR_PACK(0,SYS_F_FREAD, 0),            "fread"},
        {0, NULL},
};

static ERR_STRING_DATA ERR_str_reasons[] = {
        {ERR_R_SYS_LIB,                         "system lib"},
        {ERR_R_BN_LIB,                          "BN lib"},
        {ERR_R_RSA_LIB,                         "RSA lib"},
        {ERR_R_DH_LIB,                          "DH lib"},
        {ERR_R_EVP_LIB,                         "EVP lib"},
        {ERR_R_BUF_LIB,                         "BUF lib"},
        {ERR_R_OBJ_LIB,                         "OBJ lib"},
        {ERR_R_PEM_LIB,                         "PEM lib"},
        {ERR_R_DSA_LIB,                         "DSA lib"},
        {ERR_R_X509_LIB,                        "X509 lib"},
        {ERR_R_ASN1_LIB,                        "ASN1 lib"},
        {ERR_R_CONF_LIB,                        "CONF lib"},
        {ERR_R_CRYPTO_LIB,                      "CRYPTO lib"},
        {ERR_R_EC_LIB,                          "EC lib"},
        {ERR_R_SSL_LIB,                         "SSL lib"},
        {ERR_R_BIO_LIB,                         "BIO lib"},
        {ERR_R_PKCS7_LIB,                       "PKCS7 lib"},
        {ERR_R_X509V3_LIB,                      "X509V3 lib"},
        {ERR_R_PKCS12_LIB,                      "PKCS12 lib"},
        {ERR_R_RAND_LIB,                        "RAND lib"},
        {ERR_R_DSO_LIB,                         "DSO lib"},
        {ERR_R_ENGINE_LIB,                      "ENGINE lib"},
        {ERR_R_OCSP_LIB,                        "OCSP lib"},
        {ERR_R_TS_LIB,                          "TS lib"},

        {ERR_R_NESTED_ASN1_ERROR,               "nested asn1 error"},
        {ERR_R_BAD_ASN1_OBJECT_HEADER,          "bad asn1 object header"},
        {ERR_R_BAD_GET_ASN1_OBJECT_CALL,        "bad get asn1 object call"},
        {ERR_R_EXPECTING_AN_ASN1_SEQUENCE,      "expecting an asn1 sequence"},
        {ERR_R_ASN1_LENGTH_MISMATCH,            "asn1 length mismatch"},
        {ERR_R_MISSING_ASN1_EOS,                "missing asn1 eos"},

        {ERR_R_FATAL,                           "fatal"},
        {ERR_R_MALLOC_FAILURE,                  "malloc failure"},
        {ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED,     "called a function you should not call"},
        {ERR_R_PASSED_NULL_PARAMETER,           "passed a null parameter"},
        {ERR_R_INTERNAL_ERROR,                  "internal error"},
        {ERR_R_DISABLED ,                       "called a function that was disabled at compile-time"},

        {0, NULL},
};
#endif


/* Define the predeclared (but externally opaque) "ERR_FNS" type */
struct st_ERR_FNS {
        /* Works on the "error_hash" string table */
        LHASH_OF(ERR_STRING_DATA) *(*cb_err_get)(int create);
        void (*cb_err_del)(void);
        ERR_STRING_DATA *(*cb_err_get_item)(const ERR_STRING_DATA *);
        ERR_STRING_DATA *(*cb_err_set_item)(ERR_STRING_DATA *);
        ERR_STRING_DATA *(*cb_err_del_item)(ERR_STRING_DATA *);
        /* Works on the "thread_hash" error-state table */
        LHASH_OF(ERR_STATE) *(*cb_thread_get)(int create);
        void (*cb_thread_release)(LHASH_OF(ERR_STATE) **hash);
        ERR_STATE *(*cb_thread_get_item)(const ERR_STATE *);
        ERR_STATE *(*cb_thread_set_item)(ERR_STATE *);
        void (*cb_thread_del_item)(const ERR_STATE *);
        /* Returns the next available error "library" numbers */
        int (*cb_get_next_lib)(void);
};

/* Predeclarations of the "err_defaults" functions */
static LHASH_OF(ERR_STRING_DATA) *int_err_get(int create);
static void int_err_del(void);
static ERR_STRING_DATA *int_err_get_item(const ERR_STRING_DATA *);
static ERR_STRING_DATA *int_err_set_item(ERR_STRING_DATA *);
static ERR_STRING_DATA *int_err_del_item(ERR_STRING_DATA *);
static LHASH_OF(ERR_STATE) *int_thread_get(int create);
static void int_thread_release(LHASH_OF(ERR_STATE) **hash);
static ERR_STATE *int_thread_get_item(const ERR_STATE *);
static ERR_STATE *int_thread_set_item(ERR_STATE *);
static void int_thread_del_item(const ERR_STATE *);
static int int_err_get_next_lib(void);

/* The static ERR_FNS table using these defaults functions */
static const ERR_FNS err_defaults = {
        int_err_get,
        int_err_del,
        int_err_get_item,
        int_err_set_item,
        int_err_del_item,
        int_thread_get,
        int_thread_release,
        int_thread_get_item,
        int_thread_set_item,
        int_thread_del_item,
        int_err_get_next_lib
};

/* The replacable table of ERR_FNS functions we use at run-time */
static const ERR_FNS *err_fns = NULL;

/* Eg. rather than using "err_get()", use "ERRFN(err_get)()". */
#define ERRFN(a) err_fns->cb_##a

/* The internal state used by "err_defaults" - as such, the setting, reading,
 * creating, and deleting of this data should only be permitted via the
 * "err_defaults" functions. This way, a linked module can completely defer all
 * ERR state operation (together with requisite locking) to the implementations
 * and state in the loading application. */
static LHASH_OF(ERR_STRING_DATA) *int_error_hash = NULL;
static LHASH_OF(ERR_STATE) *int_thread_hash = NULL;
static int int_thread_hash_references = 0;
static int int_err_library_number = ERR_LIB_USER;

/* Internal function that checks whether "err_fns" is set and if not, sets it to
 * the defaults. */
static void
err_fns_check(void)
{
        if (err_fns)
                return;

        CRYPTO_w_lock(CRYPTO_LOCK_ERR);
        if (!err_fns)
                err_fns = &err_defaults;
        CRYPTO_w_unlock(CRYPTO_LOCK_ERR);
}

/* API functions to get or set the underlying ERR functions. */

const ERR_FNS *
ERR_get_implementation(void)
{
        err_fns_check();
        return err_fns;
}

int
ERR_set_implementation(const ERR_FNS *fns)
{
        int ret = 0;

        CRYPTO_w_lock(CRYPTO_LOCK_ERR);
        /* It's too late if 'err_fns' is non-NULL. BTW: not much point setting
         * an error is there?! */
        if (!err_fns) {
                err_fns = fns;
                ret = 1;
        }
        CRYPTO_w_unlock(CRYPTO_LOCK_ERR);
        return ret;
}

/* These are the callbacks provided to "lh_new()" when creating the LHASH tables
 * internal to the "err_defaults" implementation. */

static unsigned long get_error_values(int inc, int top, const char **file,
    int *line, const char **data, int *flags);

/* The internal functions used in the "err_defaults" implementation */

static unsigned long
err_string_data_hash(const ERR_STRING_DATA *a)
{
        unsigned long ret, l;

        l = a->error;
        ret = l^ERR_GET_LIB(l)^ERR_GET_FUNC(l);
        return (ret^ret % 19*13);
}
static IMPLEMENT_LHASH_HASH_FN(err_string_data, ERR_STRING_DATA)

static int
err_string_data_cmp(const ERR_STRING_DATA *a, const ERR_STRING_DATA *b)
{
        return (int)(a->error - b->error);
}
static IMPLEMENT_LHASH_COMP_FN(err_string_data, ERR_STRING_DATA)

static
LHASH_OF(ERR_STRING_DATA) *int_err_get(int create)
{
        LHASH_OF(ERR_STRING_DATA) *ret = NULL;

        CRYPTO_w_lock(CRYPTO_LOCK_ERR);
        if (!int_error_hash && create) {
                CRYPTO_push_info("int_err_get (err.c)");
                int_error_hash = lh_ERR_STRING_DATA_new();
                CRYPTO_pop_info();
        }
        if (int_error_hash)
                ret = int_error_hash;
        CRYPTO_w_unlock(CRYPTO_LOCK_ERR);

        return ret;
}

static void
int_err_del(void)
{
        CRYPTO_w_lock(CRYPTO_LOCK_ERR);
        if (int_error_hash) {
                lh_ERR_STRING_DATA_free(int_error_hash);
                int_error_hash = NULL;
        }
        CRYPTO_w_unlock(CRYPTO_LOCK_ERR);
}

static ERR_STRING_DATA *
int_err_get_item(const ERR_STRING_DATA *d)
{
        ERR_STRING_DATA *p;
        LHASH_OF(ERR_STRING_DATA) *hash;

        err_fns_check();
        hash = ERRFN(err_get)(0);
        if (!hash)
                return NULL;

        CRYPTO_r_lock(CRYPTO_LOCK_ERR);
        p = lh_ERR_STRING_DATA_retrieve(hash, d);
        CRYPTO_r_unlock(CRYPTO_LOCK_ERR);

        return p;
}

static ERR_STRING_DATA *
int_err_set_item(ERR_STRING_DATA *d)
{
        ERR_STRING_DATA *p;
        LHASH_OF(ERR_STRING_DATA) *hash;

        err_fns_check();
        hash = ERRFN(err_get)(1);
        if (!hash)
                return NULL;

        CRYPTO_w_lock(CRYPTO_LOCK_ERR);
        p = lh_ERR_STRING_DATA_insert(hash, d);
        CRYPTO_w_unlock(CRYPTO_LOCK_ERR);

        return p;
}

static ERR_STRING_DATA *
int_err_del_item(ERR_STRING_DATA *d)
{
        ERR_STRING_DATA *p;
        LHASH_OF(ERR_STRING_DATA) *hash;

        err_fns_check();
        hash = ERRFN(err_get)(0);
        if (!hash)
                return NULL;

        CRYPTO_w_lock(CRYPTO_LOCK_ERR);
        p = lh_ERR_STRING_DATA_delete(hash, d);
        CRYPTO_w_unlock(CRYPTO_LOCK_ERR);

        return p;
}

static unsigned long
err_state_hash(const ERR_STATE *a)
{
        return CRYPTO_THREADID_hash(&a->tid) * 13;
}
static IMPLEMENT_LHASH_HASH_FN(err_state, ERR_STATE)

static int
err_state_cmp(const ERR_STATE *a, const ERR_STATE *b)
{
        return CRYPTO_THREADID_cmp(&a->tid, &b->tid);
}
static IMPLEMENT_LHASH_COMP_FN(err_state, ERR_STATE)

static
LHASH_OF(ERR_STATE) *int_thread_get(int create)
{
        LHASH_OF(ERR_STATE) *ret = NULL;

        CRYPTO_w_lock(CRYPTO_LOCK_ERR);
        if (!int_thread_hash && create) {
                CRYPTO_push_info("int_thread_get (err.c)");
                int_thread_hash = lh_ERR_STATE_new();
                CRYPTO_pop_info();
        }
        if (int_thread_hash) {
                int_thread_hash_references++;
                ret = int_thread_hash;
        }
        CRYPTO_w_unlock(CRYPTO_LOCK_ERR);
        return ret;
}

static void
int_thread_release(LHASH_OF(ERR_STATE) **hash)
{
        int i;

        if (hash == NULL || *hash == NULL)
                return;

        i = CRYPTO_add(&int_thread_hash_references, -1, CRYPTO_LOCK_ERR);
        if (i > 0)
                return;

        *hash = NULL;
}

static ERR_STATE *
int_thread_get_item(const ERR_STATE *d)
{
        ERR_STATE *p;
        LHASH_OF(ERR_STATE) *hash;

        err_fns_check();
        hash = ERRFN(thread_get)(0);
        if (!hash)
                return NULL;

        CRYPTO_r_lock(CRYPTO_LOCK_ERR);
        p = lh_ERR_STATE_retrieve(hash, d);
        CRYPTO_r_unlock(CRYPTO_LOCK_ERR);

        ERRFN(thread_release)(&hash);
        return p;
}

static ERR_STATE *
int_thread_set_item(ERR_STATE *d)
{
        ERR_STATE *p;
        LHASH_OF(ERR_STATE) *hash;

        err_fns_check();
        hash = ERRFN(thread_get)(1);
        if (!hash)
                return NULL;

        CRYPTO_w_lock(CRYPTO_LOCK_ERR);
        p = lh_ERR_STATE_insert(hash, d);
        CRYPTO_w_unlock(CRYPTO_LOCK_ERR);

        ERRFN(thread_release)(&hash);
        return p;
}

static void
int_thread_del_item(const ERR_STATE *d)
{
        ERR_STATE *p;
        LHASH_OF(ERR_STATE) *hash;

        err_fns_check();
        hash = ERRFN(thread_get)(0);
        if (!hash)
                return;

        CRYPTO_w_lock(CRYPTO_LOCK_ERR);
        p = lh_ERR_STATE_delete(hash, d);
        /* make sure we don't leak memory */
        if (int_thread_hash_references == 1 &&
            int_thread_hash && lh_ERR_STATE_num_items(int_thread_hash) == 0) {
                lh_ERR_STATE_free(int_thread_hash);
                int_thread_hash = NULL;
        }
        CRYPTO_w_unlock(CRYPTO_LOCK_ERR);

        ERRFN(thread_release)(&hash);
        if (p)
                ERR_STATE_free(p);
}

static int
int_err_get_next_lib(void)
{
        int ret;

        CRYPTO_w_lock(CRYPTO_LOCK_ERR);
        ret = int_err_library_number++;
        CRYPTO_w_unlock(CRYPTO_LOCK_ERR);

        return ret;
}


#ifndef OPENSSL_NO_ERR
#define NUM_SYS_STR_REASONS 127
#define LEN_SYS_STR_REASON 32

static ERR_STRING_DATA SYS_str_reasons[NUM_SYS_STR_REASONS + 1];
/* SYS_str_reasons is filled with copies of strerror() results at
 * initialization.
 * 'errno' values up to 127 should cover all usual errors,
 * others will be displayed numerically by ERR_error_string.
 * It is crucial that we have something for each reason code
 * that occurs in ERR_str_reasons, or bogus reason strings
 * will be returned for SYSerror(which always gets an errno
 * value and never one of those 'standard' reason codes. */

static void
build_SYS_str_reasons(void)
{
        /* malloc cannot be used here, use static storage instead */
        static char strerror_tab[NUM_SYS_STR_REASONS][LEN_SYS_STR_REASON];
        int i;
        static int init = 1;

        CRYPTO_r_lock(CRYPTO_LOCK_ERR);
        if (!init) {
                CRYPTO_r_unlock(CRYPTO_LOCK_ERR);
                return;
        }

        CRYPTO_r_unlock(CRYPTO_LOCK_ERR);
        CRYPTO_w_lock(CRYPTO_LOCK_ERR);
        if (!init) {
                CRYPTO_w_unlock(CRYPTO_LOCK_ERR);
                return;
        }

        for (i = 1; i <= NUM_SYS_STR_REASONS; i++) {
                ERR_STRING_DATA *str = &SYS_str_reasons[i - 1];

                str->error = (unsigned long)i;
                if (str->string == NULL) {
                        char (*dest)[LEN_SYS_STR_REASON] =
                            &(strerror_tab[i - 1]);
                        const char *src = strerror(i);
                        if (src != NULL) {
                                strlcpy(*dest, src, sizeof *dest);
                                str->string = *dest;
                        }
                }
                if (str->string == NULL)
                        str->string = "unknown";
        }

        /* Now we still have SYS_str_reasons[NUM_SYS_STR_REASONS] = {0, NULL},
         * as required by ERR_load_strings. */

        init = 0;

        CRYPTO_w_unlock(CRYPTO_LOCK_ERR);
}
#endif

#define err_clear_data(p,i) \
        do { \
                if (((p)->err_data[i] != NULL) && \
                    (p)->err_data_flags[i] & ERR_TXT_MALLOCED) { \
                        free((p)->err_data[i]); \
                        (p)->err_data[i] = NULL; \
                } \
                (p)->err_data_flags[i] = 0; \
        } while(0)

#define err_clear(p,i) \
        do { \
                (p)->err_flags[i] = 0; \
                (p)->err_buffer[i] = 0; \
                err_clear_data(p, i); \
                (p)->err_file[i] = NULL; \
                (p)->err_line[i] = -1; \
        } while(0)

static void
ERR_STATE_free(ERR_STATE *s)
{
        int i;

        if (s == NULL)
                return;

        for (i = 0; i < ERR_NUM_ERRORS; i++) {
                err_clear_data(s, i);
        }
        free(s);
}

void
ERR_load_ERR_strings(void)
{
        err_fns_check();
#ifndef OPENSSL_NO_ERR
        err_load_strings(0, ERR_str_libraries);
        err_load_strings(0, ERR_str_reasons);
        err_load_strings(ERR_LIB_SYS, ERR_str_functs);
        build_SYS_str_reasons();
        err_load_strings(ERR_LIB_SYS, SYS_str_reasons);
#endif
}

static void
err_load_strings(int lib, ERR_STRING_DATA *str)
{
        while (str->error) {
                if (lib)
                        str->error |= ERR_PACK(lib, 0, 0);
                ERRFN(err_set_item)(str);
                str++;
        }
}

void
ERR_load_strings(int lib, ERR_STRING_DATA *str)
{
        ERR_load_ERR_strings();
        err_load_strings(lib, str);
}

void
ERR_unload_strings(int lib, ERR_STRING_DATA *str)
{
        while (str->error) {
                if (lib)
                        str->error |= ERR_PACK(lib, 0, 0);
                ERRFN(err_del_item)(str);
                str++;
        }
}

void
ERR_free_strings(void)
{
        err_fns_check();
        ERRFN(err_del)();
}

/********************************************************/

void
ERR_put_error(int lib, int func, int reason, const char *file, int line)
{
        ERR_STATE *es;
        int save_errno = errno;

        es = ERR_get_state();

        es->top = (es->top + 1) % ERR_NUM_ERRORS;
        if (es->top == es->bottom)
                es->bottom = (es->bottom + 1) % ERR_NUM_ERRORS;
        es->err_flags[es->top] = 0;
        es->err_buffer[es->top] = ERR_PACK(lib, func, reason);
        es->err_file[es->top] = file;
        es->err_line[es->top] = line;
        err_clear_data(es, es->top);
        errno = save_errno;
}

void
ERR_clear_error(void)
{
        int i;
        ERR_STATE *es;

        es = ERR_get_state();

        for (i = 0; i < ERR_NUM_ERRORS; i++) {
                err_clear(es, i);
        }
        es->top = es->bottom = 0;
}


unsigned long
ERR_get_error(void)
{
        return (get_error_values(1, 0, NULL, NULL, NULL, NULL));
}

unsigned long
ERR_get_error_line(const char **file, int *line)
{
        return (get_error_values(1, 0, file, line, NULL, NULL));
}

unsigned long
ERR_get_error_line_data(const char **file, int *line,
    const char **data, int *flags)
{
        return (get_error_values(1, 0, file, line, data, flags));
}


unsigned long
ERR_peek_error(void)
{
        return (get_error_values(0, 0, NULL, NULL, NULL, NULL));
}

unsigned long
ERR_peek_error_line(const char **file, int *line)
{
        return (get_error_values(0, 0, file, line, NULL, NULL));
}

unsigned long
ERR_peek_error_line_data(const char **file, int *line,
    const char **data, int *flags)
{
        return (get_error_values(0, 0, file, line, data, flags));
}

unsigned long
ERR_peek_last_error(void)
{
        return (get_error_values(0, 1, NULL, NULL, NULL, NULL));
}

unsigned long
ERR_peek_last_error_line(const char **file, int *line)
{
        return (get_error_values(0, 1, file, line, NULL, NULL));
}

unsigned long
ERR_peek_last_error_line_data(const char **file, int *line,
    const char **data, int *flags)
{
        return (get_error_values(0, 1, file, line, data, flags));
}

static unsigned long
get_error_values(int inc, int top, const char **file, int *line,
    const char **data, int *flags)
{
        int i = 0;
        ERR_STATE *es;
        unsigned long ret;

        es = ERR_get_state();

        if (inc && top) {
                if (file)
                        *file = "";
                if (line)
                        *line = 0;
                if (data)
                        *data = "";
                if (flags)
                        *flags = 0;

                return ERR_R_INTERNAL_ERROR;
        }

        if (es->bottom == es->top)
                return 0;
        if (top)
                i = es->top;                     /* last error */
        else
                i = (es->bottom + 1) % ERR_NUM_ERRORS; /* first error */

        ret = es->err_buffer[i];
        if (inc) {
                es->bottom = i;
                es->err_buffer[i] = 0;
        }

        if ((file != NULL) && (line != NULL)) {
                if (es->err_file[i] == NULL) {
                        *file = "NA";
                        if (line != NULL)
                                *line = 0;
                } else {
                        *file = es->err_file[i];
                        if (line != NULL)
                                *line = es->err_line[i];
                }
        }

        if (data == NULL) {
                if (inc) {
                        err_clear_data(es, i);
                }
        } else {
                if (es->err_data[i] == NULL) {
                        *data = "";
                        if (flags != NULL)
                                *flags = 0;
                } else {
                        *data = es->err_data[i];
                        if (flags != NULL)
                                *flags = es->err_data_flags[i];
                }
        }
        return ret;
}

void
ERR_error_string_n(unsigned long e, char *buf, size_t len)
{
        char lsbuf[30], fsbuf[30], rsbuf[30];
        const char *ls, *fs, *rs;
        int l, f, r, ret;

        l = ERR_GET_LIB(e);
        f = ERR_GET_FUNC(e);
        r = ERR_GET_REASON(e);

        ls = ERR_lib_error_string(e);
        fs = ERR_func_error_string(e);
        rs = ERR_reason_error_string(e);

        if (ls == NULL) {
                (void) snprintf(lsbuf, sizeof(lsbuf), "lib(%d)", l);
                ls = lsbuf;
        }
        if (fs == NULL) {
                (void) snprintf(fsbuf, sizeof(fsbuf), "func(%d)", f);
                fs = fsbuf;
        }
        if (rs == NULL) {
                (void) snprintf(rsbuf, sizeof(rsbuf), "reason(%d)", r);
                rs = rsbuf;
        }

        ret = snprintf(buf, len, "error:%08lX:%s:%s:%s", e, ls, fs, rs);
        if (ret == -1)
                return; /* can't happen, and can't do better if it does */
        if (ret >= len) {
                /* output may be truncated; make sure we always have 5
                 * colon-separated fields, i.e. 4 colons ... */
#define NUM_COLONS 4
                if (len > NUM_COLONS) /* ... if possible */
                {
                        int i;
                        char *s = buf;

                        for (i = 0; i < NUM_COLONS; i++) {
                                char *colon = strchr(s, ':');
                                if (colon == NULL ||
                                    colon > &buf[len - 1] - NUM_COLONS + i) {
                                        /* set colon no. i at last possible position
                                         * (buf[len-1] is the terminating 0)*/
                                        colon = &buf[len - 1] - NUM_COLONS + i;
                                        *colon = ':';
                                }
                                s = colon + 1;
                        }
                }
        }
}

/* BAD for multi-threading: uses a local buffer if ret == NULL */
/* ERR_error_string_n should be used instead for ret != NULL
 * as ERR_error_string cannot know how large the buffer is */
char *
ERR_error_string(unsigned long e, char *ret)
{
        static char buf[256];

        if (ret == NULL)
                ret = buf;
        ERR_error_string_n(e, ret, 256);

        return ret;
}

LHASH_OF(ERR_STRING_DATA) *ERR_get_string_table(void)
{
        err_fns_check();
        return ERRFN(err_get)(0);
}

LHASH_OF(ERR_STATE) *ERR_get_err_state_table(void)
{
        err_fns_check();
        return ERRFN(thread_get)(0);
}

void
ERR_release_err_state_table(LHASH_OF(ERR_STATE) **hash)
{
        err_fns_check();
        ERRFN(thread_release)(hash);
}

const char *
ERR_lib_error_string(unsigned long e)
{
        ERR_STRING_DATA d, *p;
        unsigned long l;

        err_fns_check();
        l = ERR_GET_LIB(e);
        d.error = ERR_PACK(l, 0, 0);
        p = ERRFN(err_get_item)(&d);
        return ((p == NULL) ? NULL : p->string);
}

const char *
ERR_func_error_string(unsigned long e)
{
        ERR_STRING_DATA d, *p;
        unsigned long l, f;

        err_fns_check();
        l = ERR_GET_LIB(e);
        f = ERR_GET_FUNC(e);
        d.error = ERR_PACK(l, f, 0);
        p = ERRFN(err_get_item)(&d);
        return ((p == NULL) ? NULL : p->string);
}

const char *
ERR_reason_error_string(unsigned long e)
{
        ERR_STRING_DATA d, *p = NULL;
        unsigned long l, r;

        err_fns_check();
        l = ERR_GET_LIB(e);
        r = ERR_GET_REASON(e);
        d.error = ERR_PACK(l, 0, r);
        p = ERRFN(err_get_item)(&d);
        if (!p) {
                d.error = ERR_PACK(0, 0, r);
                p = ERRFN(err_get_item)(&d);
        }
        return ((p == NULL) ? NULL : p->string);
}

void
ERR_remove_thread_state(const CRYPTO_THREADID *id)
{
        ERR_STATE tmp;

        if (id)
                CRYPTO_THREADID_cpy(&tmp.tid, id);
        else
                CRYPTO_THREADID_current(&tmp.tid);
        err_fns_check();
        /* thread_del_item automatically destroys the LHASH if the number of
         * items reaches zero. */
        ERRFN(thread_del_item)(&tmp);
}

#ifndef OPENSSL_NO_DEPRECATED
void
ERR_remove_state(unsigned long pid)
{
        ERR_remove_thread_state(NULL);
}
#endif

ERR_STATE *
ERR_get_state(void)
{
        static ERR_STATE fallback;
        ERR_STATE *ret, tmp, *tmpp = NULL;
        int i;
        CRYPTO_THREADID tid;

        err_fns_check();
        CRYPTO_THREADID_current(&tid);
        CRYPTO_THREADID_cpy(&tmp.tid, &tid);
        ret = ERRFN(thread_get_item)(&tmp);

        /* ret == the error state, if NULL, make a new one */
        if (ret == NULL) {
                ret = malloc(sizeof(ERR_STATE));
                if (ret == NULL)
                        return (&fallback);
                CRYPTO_THREADID_cpy(&ret->tid, &tid);
                ret->top = 0;
                ret->bottom = 0;
                for (i = 0; i < ERR_NUM_ERRORS; i++) {
                        ret->err_data[i] = NULL;
                        ret->err_data_flags[i] = 0;
                }
                tmpp = ERRFN(thread_set_item)(ret);
                /* To check if insertion failed, do a get. */
                if (ERRFN(thread_get_item)(ret) != ret) {
                        ERR_STATE_free(ret); /* could not insert it */
                        return (&fallback);
                }
                /* If a race occured in this function and we came second, tmpp
                 * is the first one that we just replaced. */
                if (tmpp)
                        ERR_STATE_free(tmpp);
        }
        return ret;
}

int
ERR_get_next_error_library(void)
{
        err_fns_check();
        return ERRFN(get_next_lib)();
}

void
ERR_set_error_data(char *data, int flags)
{
        ERR_STATE *es;
        int i;

        es = ERR_get_state();

        i = es->top;
        if (i == 0)
                i = ERR_NUM_ERRORS - 1;

        err_clear_data(es, i);
        es->err_data[i] = data;
        es->err_data_flags[i] = flags;
}

void
ERR_asprintf_error_data(char * format, ...) {
        char *errbuf = NULL;
        va_list ap;
        int r;

        va_start(ap, format);
        r = vasprintf(&errbuf, format, ap);
        va_end(ap);
        if (r == -1)
                ERR_set_error_data("malloc failed", ERR_TXT_STRING);
        else
                ERR_set_error_data(errbuf, ERR_TXT_MALLOCED|ERR_TXT_STRING);
}

void
ERR_add_error_vdata(int num, va_list args)
{
        char format[129];
        char *errbuf;
        int i;

        format[0] = '\0';
        for (i = 0; i < num; i++) {
                if (strlcat(format, "%s", sizeof(format)) >= sizeof(format)) {
                        ERR_set_error_data("too many errors", ERR_TXT_STRING);
                        return;
                }
        }
        if (vasprintf(&errbuf, format, args) == -1)
                ERR_set_error_data("malloc failed", ERR_TXT_STRING);
        else
                ERR_set_error_data(errbuf, ERR_TXT_MALLOCED|ERR_TXT_STRING);
}

void
ERR_add_error_data(int num, ...)
{
        va_list args;
        va_start(args, num);
        ERR_add_error_vdata(num, args);
        va_end(args);
}

int
ERR_set_mark(void)
{
        ERR_STATE *es;

        es = ERR_get_state();

        if (es->bottom == es->top)
                return 0;
        es->err_flags[es->top] |= ERR_FLAG_MARK;
        return 1;
}

int
ERR_pop_to_mark(void)
{
        ERR_STATE *es;

        es = ERR_get_state();

        while (es->bottom != es->top &&
            (es->err_flags[es->top] & ERR_FLAG_MARK) == 0) {
                err_clear(es, es->top);
                es->top -= 1;
                if (es->top == -1)
                        es->top = ERR_NUM_ERRORS - 1;
        }

        if (es->bottom == es->top)
                return 0;
        es->err_flags[es->top]&=~ERR_FLAG_MARK;
        return 1;
}