And so it begins...

[thirdparty/openssl.git] / crypto / err / err.c

/* crypto/err/err.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) 1998-2006 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 <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>

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_HMAC,0,0)             ,"HMAC routines"},
{ERR_PACK(ERR_LIB_CMS,0,0)              ,"CMS 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),       "ioctlsocket"},
        {ERR_PACK(0,SYS_F_BIND,0),              "bind"},
        {ERR_PACK(0,SYS_F_LISTEN,0),            "listen"},
        {ERR_PACK(0,SYS_F_ACCEPT,0),            "accept"},
#ifdef OPENSSL_SYS_WINDOWS
        {ERR_PACK(0,SYS_F_WSASTARTUP,0),        "WSAstartup"},
#endif
        {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 *(*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);
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 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;
        }


#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 SYSerr(), which always gets an errno
 * value and never one of those 'standard' reason codes. */

static void build_SYS_str_reasons(void)
        {
        /* OPENSSL_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]);
                        char *src = strerror(i);
                        if (src != NULL)
                                {
                                strncpy(*dest, src, sizeof *dest);
                                (*dest)[sizeof *dest - 1] = '\0';
                                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) \
                {  \
                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_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);
        }

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;

#ifdef _OSD_POSIX
        /* In the BS2000-OSD POSIX subsystem, the compiler generates
         * path names in the form "*POSIX(/etc/passwd)".
         * This dirty hack strips them to something sensible.
         * @@@ We shouldn't modify a const string, though.
         */
        if (strncmp(file,"*POSIX(", sizeof("*POSIX(")-1) == 0) {
                char *end;

                /* Skip the "*POSIX(" prefix */
                file += sizeof("*POSIX(")-1;
                end = &file[strlen(file)-1];
                if (*end == ')')
                        *end = '\0';
                /* Optional: use the basename of the path only. */
                if ((end = strrchr(file, '/')) != NULL)
                        file = &end[1];
        }
#endif
        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);
        }

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[64], fsbuf[64], rsbuf[64];
        const char *ls,*fs,*rs;
        unsigned long l,f,r;

        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) 
                BIO_snprintf(lsbuf, sizeof(lsbuf), "lib(%lu)", l);
        if (fs == NULL)
                BIO_snprintf(fsbuf, sizeof(fsbuf), "func(%lu)", f);
        if (rs == NULL)
                BIO_snprintf(rsbuf, sizeof(rsbuf), "reason(%lu)", r);

        BIO_snprintf(buf, len,"error:%08lX:%s:%s:%s", e, ls?ls:lsbuf, 
                fs?fs:fsbuf, rs?rs:rsbuf);
        if (strlen(buf) == len-1)
                {
                /* 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 *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 + (unsigned long)((const ERR_STATE *)a_void)->pidptr)*13);
        }

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

void ERR_remove_state(unsigned long pid)
        {
        ERR_STATE tmp;
        void *pidptr;

        err_fns_check();
        if (pid != 0)
                pidptr = &errno;
        else
                {
                pid = CRYPTO_thread_id();
                pidptr = CRYPTO_thread_idptr();
                }
        
        tmp.pid=pid;
        tmp.pidptr=pidptr;
        /* thread_del_item automatically destroys the LHASH if the number of
         * items reaches zero. */
        ERRFN(thread_del_item)(&tmp);
        }

ERR_STATE *ERR_get_state(void)
        {
        static ERR_STATE fallback;
        ERR_STATE *ret,tmp,*tmpp=NULL;
        int i;
        unsigned long pid;
        void *pidptr;

        err_fns_check();
        pid = CRYPTO_thread_id();
        pidptr = CRYPTO_thread_idptr();
        tmp.pid = pid;
        tmp.pidptr = pidptr;
        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->pidptr=pidptr;
                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_add_error_data(int num, ...)
        {
        va_list args;
        int i,n,s;
        char *str,*p,*a;

        s=80;
        str=OPENSSL_malloc(s+1);
        if (str == NULL) return;
        str[0]='\0';

        va_start(args, num);
        n=0;
        for (i=0; i<num; i++)
                {
                a=va_arg(args, char*);
                /* ignore NULLs, thanks to Bob Beck <beck@obtuse.com> */
                if (a != NULL)
                        {
                        n+=strlen(a);
                        if (n > s)
                                {
                                s=n+20;
                                p=OPENSSL_realloc(str,s+1);
                                if (p == NULL)
                                        {
                                        OPENSSL_free(str);
                                        goto err;
                                        }
                                else
                                        str=p;
                                }
                        BUF_strlcat(str,a,(size_t)s+1);
                        }
                }
        ERR_set_error_data(str,ERR_TXT_MALLOCED|ERR_TXT_STRING);

err:
        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;
        }