/* crypto/err/err_def.c */
/* 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) 1998-2001 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 <stdio.h>
#include <stdarg.h>
#include <string.h>
#include "cryptlib.h"
#include <openssl/lhash.h>
#include <openssl/crypto.h>
#include <openssl/buffer.h>
#include <openssl/bio.h>
#include <openssl/err.h>

#define err_clear_data(p,i) \
        do { \
        if (((p)->err_data[i] != NULL) && \
                (p)->err_data_flags[i] & ERR_TXT_MALLOCED) \
                {  \
                OPENSSL_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_load_strings(int lib, ERR_STRING_DATA *str);

static void ERR_STATE_free(ERR_STATE *s);

/* Define the predeclared (but externally opaque) "ERR_FNS" type */
struct st_ERR_FNS {
    /* Works on the "error_hash" string table */
    LHASH *(*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 *(*cb_thread_get) (int create);
    void (*cb_thread_release) (LHASH **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 *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 *int_thread_get(int create);
static void int_thread_release(LHASH **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 *int_error_hash = NULL;
static LHASH *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 err_hash(ERR_STRING_DATA *a); */
static unsigned long err_hash(const void *a_void);
/* static int err_cmp(ERR_STRING_DATA *a, ERR_STRING_DATA *b); */
static int err_cmp(const void *a_void, const void *b_void);
/* static unsigned long pid_hash(ERR_STATE *pid); */
static unsigned long pid_hash(const void *pid_void);
/* static int pid_cmp(ERR_STATE *a,ERR_STATE *pid); */
static int pid_cmp(const void *a_void, const void *pid_void);

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

static LHASH *int_err_get(int create)
{
    LHASH *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_new(err_hash, err_cmp);
        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_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 *hash;

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

    CRYPTO_r_lock(CRYPTO_LOCK_ERR);
    p = (ERR_STRING_DATA *)lh_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 *hash;

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

    CRYPTO_w_lock(CRYPTO_LOCK_ERR);
    p = (ERR_STRING_DATA *)lh_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 *hash;

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

    CRYPTO_w_lock(CRYPTO_LOCK_ERR);
    p = (ERR_STRING_DATA *)lh_delete(hash, d);
    CRYPTO_w_unlock(CRYPTO_LOCK_ERR);

    return p;
}

static LHASH *int_thread_get(int create)
{
    LHASH *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_new(pid_hash, pid_cmp);
        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 **hash)
{
    int i;

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

    i = CRYPTO_add(&int_thread_hash_references, -1, CRYPTO_LOCK_ERR);

#ifdef REF_PRINT
    fprintf(stderr, "%4d:%s\n", int_thread_hash_references, "ERR");
#endif
    if (i > 0)
        return;
#ifdef REF_CHECK
    if (i < 0) {
        fprintf(stderr, "int_thread_release, bad reference count\n");
        abort();                /* ok */
    }
#endif
    *hash = NULL;
}

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

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

    CRYPTO_r_lock(CRYPTO_LOCK_ERR);
    p = (ERR_STATE *)lh_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 *hash;

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

    CRYPTO_w_lock(CRYPTO_LOCK_ERR);
    p = (ERR_STATE *)lh_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 *hash;

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

    CRYPTO_w_lock(CRYPTO_LOCK_ERR);
    p = (ERR_STATE *)lh_delete(hash, d);
    /* make sure we don't leak memory */
    if (int_thread_hash_references == 1
        && int_thread_hash && (lh_num_items(int_thread_hash) == 0)) {
        lh_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;
}

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);
    }
    OPENSSL_free(s);
}

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_fns_check();
    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) ();
}

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

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

void ERR_release_err_state_table(LHASH **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);
}

/* static unsigned long err_hash(ERR_STRING_DATA *a) */
static unsigned long err_hash(const void *a_void)
{
    unsigned long ret, l;

    l = ((const ERR_STRING_DATA *)a_void)->error;
    ret = l ^ ERR_GET_LIB(l) ^ ERR_GET_FUNC(l);
    return (ret ^ ret % 19 * 13);
}

/* static int err_cmp(ERR_STRING_DATA *a, ERR_STRING_DATA *b) */
static int err_cmp(const void *a_void, const void *b_void)
{
    return ((int)(((const ERR_STRING_DATA *)a_void)->error -
                  ((const ERR_STRING_DATA *)b_void)->error));
}

/* static unsigned long pid_hash(ERR_STATE *a) */
static unsigned long pid_hash(const void *a_void)
{
    return (((const ERR_STATE *)a_void)->pid * 13);
}

/* static int pid_cmp(ERR_STATE *a, ERR_STATE *b) */
static int pid_cmp(const void *a_void, const void *b_void)
{
    return ((int)((long)((const ERR_STATE *)a_void)->pid -
                  (long)((const ERR_STATE *)b_void)->pid));
}

#ifdef OPENSSL_FIPS
static void int_err_remove_state(unsigned long pid)
#else
void ERR_remove_state(unsigned long pid)
#endif
{
    ERR_STATE tmp;

    err_fns_check();
    if (pid == 0)
        pid = (unsigned long)CRYPTO_thread_id();
    tmp.pid = pid;
    /*
     * thread_del_item automatically destroys the LHASH if the number of
     * items reaches zero.
     */
    ERRFN(thread_del_item) (&tmp);
}

#ifdef OPENSSL_FIPS
static ERR_STATE *int_err_get_state(void)
#else
ERR_STATE *ERR_get_state(void)
#endif
{
    static ERR_STATE fallback;
    ERR_STATE *ret, tmp, *tmpp = NULL;
    int i;
    unsigned long pid;

    err_fns_check();
    pid = (unsigned long)CRYPTO_thread_id();
    tmp.pid = pid;
    ret = ERRFN(thread_get_item) (&tmp);

    /* ret == the error state, if NULL, make a new one */
    if (ret == NULL) {
        ret = (ERR_STATE *)OPENSSL_malloc(sizeof(ERR_STATE));
        if (ret == NULL)
            return (&fallback);
        ret->pid = pid;
        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;
}

#ifdef OPENSSL_FIPS
void int_ERR_lib_init(void)
{
    int_ERR_set_state_func(int_err_get_state, int_err_remove_state);
}
#endif

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