include/openssl/err.h

/* 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). */

#ifndef OPENSSL_HEADER_ERR_H
#define OPENSSL_HEADER_ERR_H

#include <openssl/base.h>
#include <openssl/thread.h>
#include <openssl/lhash.h>

#if defined(__cplusplus)
extern "C" {
#endif


/* Error queue handling functions.
 *
 * Errors in OpenSSL are generally signalled by the return value of a function.
 * When a function fails it may add an entry to a per-thread error queue,
 * which is managed by the functions in this header.
 *
 * Each error contains:
 *   1) The library (i.e. ec, pem, rsa) which created it.
 *   2) A function identifier and reason code.
 *   3) The file and line number of the call that added the error.
 *   4) A pointer to some error specific data, which may be NULL.
 *
 * The library identifier, function identifier and reason code are packed in a
 * uint32_t and there exist various functions for unpacking it.
 *
 * The typical behaviour is that an error will occur deep in a call queue and
 * that code will push an error onto the error queue. As the error queue
 * unwinds, other functions will push their own errors. Thus, the "least
 * recent" error is the most specific and the other errors will provide a
 * backtrace of sorts. */


/* Startup and shutdown. */

/* ERR_load_crypto_strings initialises the error string hash with builtin
 * values. If this is not called then the string forms of errors produced by
 * the functions below will contain numeric identifiers rather than
 * human-readable strings. */
OPENSSL_EXPORT void ERR_load_crypto_strings(void);

/* ERR_free_strings frees any internal error values that have been loaded. This
 * should only be called at process shutdown. */
OPENSSL_EXPORT void ERR_free_strings(void);


/* Reading and formatting errors. */

/* ERR_get_error gets the packed error code for the least recent error and
 * removes that error from the queue. If there are no errors in the queue then
 * it returns zero. */
OPENSSL_EXPORT uint32_t ERR_get_error(void);

/* ERR_get_error_line acts like |ERR_get_error|, except that the file and line
 * number of the call that added the error are also returned. */
OPENSSL_EXPORT uint32_t ERR_get_error_line(const char **file, int *line);

/* ERR_get_error_line_data acts like |ERR_get_error_line|, but also returns the
 * error-specific data pointer and flags. The flags are a bitwise-OR of
 * |ERR_FLAG_*| values. The error-specific data is owned by the error queue
 * and the pointer becomes invalid after the next call that affects the same
 * thread's error queue. If |*flags| contains |ERR_FLAG_STRING| then |*data| is
 * human-readable. */
OPENSSL_EXPORT uint32_t ERR_get_error_line_data(const char **file, int *line,
                                                const char **data, int *flags);

/* The "peek" functions act like the |ERR_get_error| functions, above, but they
 * do not remove the error from the queue. */
OPENSSL_EXPORT uint32_t ERR_peek_error(void);
OPENSSL_EXPORT uint32_t ERR_peek_error_line(const char **file, int *line);
OPENSSL_EXPORT uint32_t ERR_peek_error_line_data(const char **file, int *line,
                                                 const char **data, int *flags);

/* The "peek last" functions act like the "peek" functions, above, except that
 * they return the most recent error. */
OPENSSL_EXPORT uint32_t ERR_peek_last_error(void);
OPENSSL_EXPORT uint32_t ERR_peek_last_error_line(const char **file, int *line);
OPENSSL_EXPORT uint32_t
    ERR_peek_last_error_line_data(const char **file, int *line,
                                  const char **data, int *flags);

/* ERR_error_string generates a human-readable string representing
 * |packed_error|, places it at |buf| (which must be at least
 * ERR_ERROR_STRING_BUF_LEN bytes long) and returns |buf|. If |buf| is NULL,
 * the error string is placed in a static buffer which is returned. (The static
 * buffer may be overridden by concurrent calls in other threads so this form
 * is deprecated.)
 *
 * The string will have the following format:
 *
 *   error:[error code]:[library name]:[function name]:[reason string]
 *
 * error code is an 8 digit hexadecimal number; library name, function name
 * and reason string are ASCII text.
 *
 * TODO(fork): remove in favour of |ERR_error_string_n|. */
OPENSSL_EXPORT char *ERR_error_string(uint32_t packed_error, char *buf);
#define ERR_ERROR_STRING_BUF_LEN 256

/* ERR_error_string_n is a variant of |ERR_error_string| that writes at most
 * len characters (including the terminating NUL) and truncates the string if
 * necessary. If |len| is greater than zero then |buf| is always NUL
 * terminated. */
OPENSSL_EXPORT void ERR_error_string_n(uint32_t packed_error, char *buf,
                                       size_t len);

/* ERR_lib_error_string returns a string representation of the library that
 * generated |packed_error|. */
OPENSSL_EXPORT const char *ERR_lib_error_string(uint32_t packed_error);

/* ERR_func_error_string returns a string representation of the function that
 * generated |packed_error|. */
OPENSSL_EXPORT const char *ERR_func_error_string(uint32_t packed_error);

/* ERR_reason_error_string returns a string representation of the reason for
 * |packed_error|. */
OPENSSL_EXPORT const char *ERR_reason_error_string(uint32_t packed_error);

/* ERR_print_errors_callback_t is the type of a function used by
 * |ERR_print_errors_cb|. It takes a pointer to a human readable string (and
 * its length) that describes an entry in the error queue. The |ctx| argument
 * is an opaque pointer given to |ERR_print_errors_cb|.
 *
 * It should return one on success or zero on error, which will stop the
 * iteration over the error queue. */
typedef int (*ERR_print_errors_callback_t)(const char *str, size_t len,
                                           void *ctx);

/* ERR_print_errors_cb calls |callback| with a string representation of each
 * error in the current thread's error queue, from the least recent to the most
 * recent error.
 *
 * The string will have the following format (which differs from
 * |ERR_error_string|):
 *
 *   [thread id]:error:[error code]:[library name]:[function name]:
 *   [reason string]:[file]:[line number]:[optional string data]
 *
 * (All in one line.)
 *
 * The callback can return one to continue the iteration or zero to stop it.
 * The |ctx| argument is an opaque value that is passed through to the
 * callback. */
OPENSSL_EXPORT void ERR_print_errors_cb(ERR_print_errors_callback_t callback,
                                        void *ctx);


/* Clearing errors. */

/* ERR_clear_error clears the error queue for the current thread. */
OPENSSL_EXPORT void ERR_clear_error(void);

/* ERR_remove_thread_state deletes the error queue for the given thread. If
 * |tid| is NULL then the error queue for the current thread is deleted. */
OPENSSL_EXPORT void ERR_remove_thread_state(const CRYPTO_THREADID *tid);


/* Custom errors. */

/* ERR_get_next_error_library returns a value suitable for passing as the
 * |library| argument to |ERR_put_error|. This is intended for code that wishes
 * to push its own, non-standard errors to the error queue. */
OPENSSL_EXPORT int ERR_get_next_error_library(void);


/* Private functions. */

/* ERR_clear_system_error clears the system's error value (i.e. errno). */
OPENSSL_EXPORT void ERR_clear_system_error(void);

/* OPENSSL_PUT_ERROR is used by OpenSSL code to add an error to the error
 * queue. */
#define OPENSSL_PUT_ERROR(library, func, reason)                         \
  ERR_put_error(ERR_LIB_##library, library##_F_##func, reason, __FILE__, \
                __LINE__)

/* OPENSSL_PUT_SYSTEM_ERROR is used by OpenSSL code to add an error from the
 * operating system to the error queue. */
/* TODO(fork): include errno. */
#define OPENSSL_PUT_SYSTEM_ERROR(func) \
  ERR_put_error(ERR_LIB_SYS, SYS_F_##func, 0, __FILE__, __LINE__);

/* ERR_put_error adds an error to the error queue, dropping the least recent
 * error if neccessary for space reasons. */
OPENSSL_EXPORT void ERR_put_error(int library, int func, int reason,
                                  const char *file, unsigned line);

/* ERR_add_error_data takes a variable number (|count|) of const char*
 * pointers, concatenates them and sets the result as the data on the most
 * recent error. */
OPENSSL_EXPORT void ERR_add_error_data(unsigned count, ...);

/* ERR_add_error_dataf takes a printf-style format and arguments, and sets the
 * result as the data on the most recent error. */
OPENSSL_EXPORT void ERR_add_error_dataf(const char *format, ...);

/* ERR_set_mark "marks" the most recent error for use with |ERR_pop_to_mark|.
 * It returns one if an error was marked and zero if there are no errors. */
OPENSSL_EXPORT int ERR_set_mark(void);

/* ERR_pop_to_mark removes errors from the most recent to the least recent
 * until (and not including) a "marked" error. It returns zero if no marked
 * error was found (and thus all errors were removed) and one otherwise. Errors
 * are marked using |ERR_set_mark|. */
OPENSSL_EXPORT int ERR_pop_to_mark(void);

struct err_error_st {
  /* file contains the filename where the error occured. */
  const char *file;
  /* data contains optional data. It must be freed with |OPENSSL_free| if
   * |flags&ERR_FLAG_MALLOCED|. */
  char *data;
  /* packed contains the error library, function and reason, as packed by
   * ERR_PACK. */
  uint32_t packed;
  /* line contains the line number where the error occured. */
  uint16_t line;
  /* flags contains a bitwise-OR of ERR_FLAG_* values. */
  uint8_t flags;
};

/* ERR_FLAG_STRING means that the |data| member is a NUL-terminated string that
 * can be printed. */
#define ERR_FLAG_STRING 1
/* ERR_TXT_STRING is provided for compatibility with code that assumes that
 * it's using OpenSSL. */
#define ERR_TXT_STRING ERR_FLAG_STRING

/* ERR_FLAG_PUBLIC_MASK is applied to the flags field before it is returned
 * from functions like |ERR_get_error_line_data|. */
#define ERR_FLAG_PUBLIC_MASK 0xf

/* The following flag values are internal and are masked when flags are
 * returned from functions like |ERR_get_error_line_data|. */

/* ERR_FLAG_MALLOCED means the the |data| member must be freed when no longer
 * needed. */
#define ERR_FLAG_MALLOCED 16
/* ERR_FLAG_MARK is used to indicate a reversion point in the queue. See
 * |ERR_pop_to_mark|. */
#define ERR_FLAG_MARK 32

/* ERR_NUM_ERRORS is the limit of the number of errors in the queue. */
#define ERR_NUM_ERRORS 16

/* ERR_STATE contains the per-thread, error queue. */
typedef struct err_state_st {
  /* tid is the identifier of the thread that owns this queue. */
  CRYPTO_THREADID tid;

  /* errors contains the ERR_NUM_ERRORS most recent errors, organised as a ring
   * buffer. */
  struct err_error_st errors[ERR_NUM_ERRORS];
  /* top contains the index one past the most recent error. If |top| equals
   * |bottom| then the queue is empty. */
  unsigned top;
  /* bottom contains the index of the last error in the queue. */
  unsigned bottom;

  /* to_free, if not NULL, contains a pointer owned by this structure that was
   * previously a |data| pointer of one of the elements of |errors|. */
  void *to_free;
} ERR_STATE;

enum {
  ERR_LIB_NONE = 1,
  ERR_LIB_SYS,
  ERR_LIB_BN,
  ERR_LIB_RSA,
  ERR_LIB_DH,
  ERR_LIB_EVP,
  ERR_LIB_BUF,
  ERR_LIB_OBJ,
  ERR_LIB_PEM,
  ERR_LIB_DSA,
  ERR_LIB_X509,
  ERR_LIB_ASN1,
  ERR_LIB_CONF,
  ERR_LIB_CRYPTO,
  ERR_LIB_EC,
  ERR_LIB_SSL,
  ERR_LIB_BIO,
  ERR_LIB_PKCS7,
  ERR_LIB_PKCS8,
  ERR_LIB_X509V3,
  ERR_LIB_RAND,
  ERR_LIB_ENGINE,
  ERR_LIB_OCSP,
  ERR_LIB_UI,
  ERR_LIB_COMP,
  ERR_LIB_ECDSA,
  ERR_LIB_ECDH,
  ERR_LIB_HMAC,
  ERR_LIB_DIGEST,
  ERR_LIB_CIPHER,
  ERR_LIB_USER,
  ERR_NUM_LIBS
};

#define ERR_R_SYS_LIB ERR_LIB_SYS
#define ERR_R_BN_LIB ERR_LIB_BN
#define ERR_R_RSA_LIB ERR_LIB_RSA
#define ERR_R_DH_LIB ERR_LIB_DH
#define ERR_R_EVP_LIB ERR_LIB_EVP
#define ERR_R_BUF_LIB ERR_LIB_BUF
#define ERR_R_OBJ_LIB ERR_LIB_OBJ
#define ERR_R_PEM_LIB ERR_LIB_PEM
#define ERR_R_DSA_LIB ERR_LIB_DSA
#define ERR_R_X509_LIB ERR_LIB_X509
#define ERR_R_ASN1_LIB ERR_LIB_ASN1
#define ERR_R_CONF_LIB ERR_LIB_CONF
#define ERR_R_CRYPTO_LIB ERR_LIB_CRYPTO
#define ERR_R_EC_LIB ERR_LIB_EC
#define ERR_R_SSL_LIB ERR_LIB_SSL
#define ERR_R_BIO_LIB ERR_LIB_BIO
#define ERR_R_PKCS7_LIB ERR_LIB_PKCS7
#define ERR_R_PKCS8_LIB ERR_LIB_PKCS8
#define ERR_R_X509V3_LIB ERR_LIB_X509V3
#define ERR_R_RAND_LIB ERR_LIB_RAND
#define ERR_R_DSO_LIB ERR_LIB_DSO
#define ERR_R_ENGINE_LIB ERR_LIB_ENGINE
#define ERR_R_OCSP_LIB ERR_LIB_OCSP
#define ERR_R_UI_LIB ERR_LIB_UI
#define ERR_R_COMP_LIB ERR_LIB_COMP
#define ERR_R_ECDSA_LIB ERR_LIB_ECDSA
#define ERR_R_ECDH_LIB ERR_LIB_ECDH
#define ERR_R_STORE_LIB ERR_LIB_STORE
#define ERR_R_FIPS_LIB ERR_LIB_FIPS
#define ERR_R_CMS_LIB ERR_LIB_CMS
#define ERR_R_TS_LIB ERR_LIB_TS
#define ERR_R_HMAC_LIB ERR_LIB_HMAC
#define ERR_R_JPAKE_LIB ERR_LIB_JPAKE
#define ERR_R_USER_LIB ERR_LIB_USER
#define ERR_R_DIGEST_LIB ERR_LIB_DIGEST
#define ERR_R_CIPHER_LIB ERR_LIB_CIPHER

/* Global reasons. */
#define ERR_R_FATAL 64
#define ERR_R_MALLOC_FAILURE (1 | ERR_R_FATAL)
#define ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED (2 | ERR_R_FATAL)
#define ERR_R_PASSED_NULL_PARAMETER (3 | ERR_R_FATAL)
#define ERR_R_INTERNAL_ERROR (4 | ERR_R_FATAL)
#define ERR_R_OVERFLOW (5 | ERR_R_FATAL)

/* System error functions */
#define SYS_F_fopen 100
#define SYS_F_fclose 101
#define SYS_F_fread 102
#define SYS_F_fwrite 103
#define SYS_F_socket 104
#define SYS_F_setsockopt 105
#define SYS_F_connect 106
#define SYS_F_getaddrinfo 107

#define ERR_PACK(lib, func, reason)                                        \
  (((((uint32_t)lib) & 0xff) << 24) | ((((uint32_t)func) & 0xfff) << 12) | \
   ((((uint32_t)reason) & 0xfff)))

#define ERR_GET_LIB(packed_error) ((int)(((packed_error) >> 24) & 0xff))
#define ERR_GET_FUNC(packed_error) ((int)(((packed_error) >> 12) & 0xfff))
#define ERR_GET_REASON(packed_error) ((int)((packed_error) & 0xfff))

/* ERR_STRING_DATA is the type of an lhash node that contains a mapping from a
 * library, function or reason code to a string representation of it. */
typedef struct err_string_data_st {
  uint32_t error;
  const char *string;
} ERR_STRING_DATA;

/* ERR_load_strings loads an array of ERR_STRING_DATA into the hash table. The
 * array must be terminated by an entry with a NULL string. */
OPENSSL_EXPORT void ERR_load_strings(const ERR_STRING_DATA *str);

/* ERR_FNS_st is a structure of function pointers that contains the actual
 * implementation of the error queue handling functions. */
struct ERR_FNS_st {
  void (*shutdown)(void);
  ERR_STRING_DATA *(*get_item)(uint32_t packed_error);
  ERR_STRING_DATA *(*set_item)(const ERR_STRING_DATA *);
  ERR_STRING_DATA *(*del_item)(uint32_t packed_error);

  /* get_state returns the ERR_STATE for the current thread. This function
   * never returns NULL. */
  ERR_STATE *(*get_state)(void);

  /* release_state returns the |ERR_STATE| for the given thread, or NULL if
   * none exists. It the return value is not NULL, it also returns ownership of
   * the |ERR_STATE| and deletes it from its data structures. */
  ERR_STATE *(*release_state)(const CRYPTO_THREADID *tid);

  /* get_next_library returns a unique value suitable for passing as the
   * |library| to error calls. It will be distinct from all built-in library
   * values. */
  int (*get_next_library)(void);
};

/* OPENSSL_DECLARE_ERROR_REASON is used by util/make_errors.h (which generates
 * the error defines) to recognise that an additional reason value is needed.
 * This is needed when the reason value is used outside of an
 * |OPENSSL_PUT_ERROR| macro. The resulting define will be
 * ${lib}_R_${reason}. */
#define OPENSSL_DECLARE_ERROR_REASON(lib, reason)

/* OPENSSL_DECLARE_ERROR_FUNCTION is used by util/make_errors.h (which
 * generates the error * defines to recognise that an additional function value
 * is needed. This is * needed when the function value is used outside of an
 * |OPENSSL_PUT_ERROR| * macro. The resulting define will be
 * ${lib}_F_${reason}. */
#define OPENSSL_DECLARE_ERROR_FUNCTION(lib, function_name)

/* ERR_load_BIO_strings does nothing.
 *
 * TODO(fork): remove. libjingle calls this. */
OPENSSL_EXPORT void ERR_load_BIO_strings(void);


#if defined(__cplusplus)
} /* extern C */
#endif

#endif /* OPENSSL_HEADER_ERR_H */