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 /*
  * Copyright 2019-2023 The OpenSSL Project Authors. All Rights Reserved.
  *
  * Licensed under the Apache License 2.0 (the "License").  You may not use
  * this file except in compliance with the License.  You can obtain a copy
  * in the file LICENSE in the source distribution or at
  * https://www.openssl.org/source/license.html
  */
 
 #ifndef OPENSSL_TRACE_H
 # define OPENSSL_TRACE_H
 # pragma once
 
 # include <stdarg.h>
 
 # include <openssl/bio.h>
 
 # ifdef  __cplusplus
 extern "C" {
 # endif
 
 /*
  * TRACE CATEGORIES
  */
 
 /*
  * The trace messages of the OpenSSL libraries are organized into different
  * categories. For every trace category, the application can register a separate
  * tracer callback. When a callback is registered, a so called trace channel is
  * created for this category. This channel consists essentially of an internal
  * BIO which sends all trace output it receives to the registered application
  * callback.
  *
  * The ALL category can be used as a fallback category to register a single
  * channel which receives the output from all categories. However, if the
  * application intends to print the trace channel name in the line prefix,
  * it is better to register channels for all categories separately.
  * (This is how the openssl application does it.)
  */
 # define OSSL_TRACE_CATEGORY_ALL                 0 /* The fallback */
 # define OSSL_TRACE_CATEGORY_TRACE               1
 # define OSSL_TRACE_CATEGORY_INIT                2
 # define OSSL_TRACE_CATEGORY_TLS                 3
 # define OSSL_TRACE_CATEGORY_TLS_CIPHER          4
 # define OSSL_TRACE_CATEGORY_CONF                5
 # define OSSL_TRACE_CATEGORY_ENGINE_TABLE        6
 # define OSSL_TRACE_CATEGORY_ENGINE_REF_COUNT    7
 # define OSSL_TRACE_CATEGORY_PKCS5V2             8
 # define OSSL_TRACE_CATEGORY_PKCS12_KEYGEN       9
 # define OSSL_TRACE_CATEGORY_PKCS12_DECRYPT     10
 # define OSSL_TRACE_CATEGORY_X509V3_POLICY      11
 # define OSSL_TRACE_CATEGORY_BN_CTX             12
 # define OSSL_TRACE_CATEGORY_CMP                13
 # define OSSL_TRACE_CATEGORY_STORE              14
 # define OSSL_TRACE_CATEGORY_DECODER            15
 # define OSSL_TRACE_CATEGORY_ENCODER            16
 # define OSSL_TRACE_CATEGORY_REF_COUNT          17
 # define OSSL_TRACE_CATEGORY_HTTP               18
 /* Count of available categories. */
 # define OSSL_TRACE_CATEGORY_NUM                19
 /* KEEP THIS LIST IN SYNC with trace_categories[] in crypto/trace.c */
 
 /* Returns the trace category number for the given |name| */
 int OSSL_trace_get_category_num(const char *name);
 
 /* Returns the trace category name for the given |num| */
 const char *OSSL_trace_get_category_name(int num);
 
 /*
  * TRACE CONSUMERS
  */
 
 /*
  * Enables tracing for the given |category| by providing a BIO sink
  * as |channel|. If a null pointer is passed as |channel|, an existing
  * trace channel is removed and tracing for the category is disabled.
  *
  * Returns 1 on success and 0 on failure
  */
 int OSSL_trace_set_channel(int category, BIO* channel);
 
 /*
  * Attach a prefix and a suffix to the given |category|, to be printed at the
  * beginning and at the end of each trace output group, i.e. when
  * OSSL_trace_begin() and OSSL_trace_end() are called.
  * If a null pointer is passed as argument, the existing prefix or suffix is
  * removed.
  *
  * They return 1 on success and 0 on failure
  */
 int OSSL_trace_set_prefix(int category, const char *prefix);
 int OSSL_trace_set_suffix(int category, const char *suffix);
 
 /*
  * OSSL_trace_cb is the type tracing callback provided by the application.
  * It MUST return the number of bytes written, or 0 on error (in other words,
  * it can never write zero bytes).
  *
  * The |buffer| will always contain text, which may consist of several lines.
  * The |data| argument points to whatever data was provided by the application
  * when registering the tracer function.
  *
  * The |category| number is given, as well as a |cmd| number, described below.
  */
 typedef size_t (*OSSL_trace_cb)(const char *buffer, size_t count,
                                 int category, int cmd, void *data);
 /*
  * Possible |cmd| numbers.
  */
 # define OSSL_TRACE_CTRL_BEGIN  0
 # define OSSL_TRACE_CTRL_WRITE  1
 # define OSSL_TRACE_CTRL_END    2
 
 /*
  * Enables tracing for the given |category| by creating an internal
  * trace channel which sends the output to the given |callback|.
  * If a null pointer is passed as callback, an existing trace channel
  * is removed and tracing for the category is disabled.
  *
  * NOTE: OSSL_trace_set_channel() and OSSL_trace_set_callback() are mutually
  *       exclusive.
  *
  * Returns 1 on success and 0 on failure
  */
 int OSSL_trace_set_callback(int category, OSSL_trace_cb callback, void *data);
 
 /*
  * TRACE PRODUCERS
  */
 
 /*
  * Returns 1 if tracing for the specified category is enabled, otherwise 0
  */
 int OSSL_trace_enabled(int category);
 
 /*
  * Wrap a group of tracing output calls.  OSSL_trace_begin() locks tracing and
  * returns the trace channel associated with the given category, or NULL if no
  * channel is associated with the category.  OSSL_trace_end() unlocks tracing.
  *
  * Usage:
  *
  *    BIO *out;
  *    if ((out = OSSL_trace_begin(category)) != NULL) {
  *        ...
  *        BIO_fprintf(out, ...);
  *        ...
  *        OSSL_trace_end(category, out);
  *    }
  *
  * See also the convenience macros OSSL_TRACE_BEGIN and OSSL_TRACE_END below.
  */
 BIO *OSSL_trace_begin(int category);
 void OSSL_trace_end(int category, BIO *channel);
 
 /*
  * OSSL_TRACE* Convenience Macros
  */
 
 /*
  * When the tracing feature is disabled, these macros are defined to
  * produce dead code, which a good compiler should eliminate.
  */
 
 /*
  * OSSL_TRACE_BEGIN, OSSL_TRACE_END - Define a Trace Group
  *
  * These two macros can be used to create a block which is executed only
  * if the corresponding trace category is enabled. Inside this block, a
  * local variable named |trc_out| is defined, which points to the channel
  * associated with the given trace category.
  *
  * Usage: (using 'TLS' as an example category)
  *
  *     OSSL_TRACE_BEGIN(TLS) {
  *
  *         BIO_fprintf(trc_out, ... );
  *
  *     } OSSL_TRACE_END(TLS);
  *
  *
  * This expands to the following code
  *
  *     do {
  *         BIO *trc_out = OSSL_trace_begin(OSSL_TRACE_CATEGORY_TLS);
  *         if (trc_out != NULL) {
  *             ...
  *             BIO_fprintf(trc_out, ...);
  *         }
  *         OSSL_trace_end(OSSL_TRACE_CATEGORY_TLS, trc_out);
  *     } while (0);
  *
  * The use of the inner '{...}' group and the trailing ';' is enforced
  * by the definition of the macros in order to make the code look as much
  * like C code as possible.
  *
  * Before returning from inside the trace block, it is necessary to
  * call OSSL_TRACE_CANCEL(category).
  */
 
 # if !defined OPENSSL_NO_TRACE && !defined FIPS_MODULE
 
 #  define OSSL_TRACE_BEGIN(category) \
     do { \
         BIO *trc_out = OSSL_trace_begin(OSSL_TRACE_CATEGORY_##category); \
  \
         if (trc_out != NULL)
 
 #  define OSSL_TRACE_END(category) \
         OSSL_trace_end(OSSL_TRACE_CATEGORY_##category, trc_out); \
     } while (0)
 
 #  define OSSL_TRACE_CANCEL(category) \
         OSSL_trace_end(OSSL_TRACE_CATEGORY_##category, trc_out) \
 
 # else
 
 #  define OSSL_TRACE_BEGIN(category)           \
     do {                                        \
         BIO *trc_out = NULL;                    \
         if (0)
 
 #  define OSSL_TRACE_END(category)             \
     } while(0)
 
 #  define OSSL_TRACE_CANCEL(category)          \
     ((void)0)
 
 # endif
 
 /*
  * OSSL_TRACE_ENABLED() - Check whether tracing is enabled for |category|
  *
  * Usage:
  *
  *     if (OSSL_TRACE_ENABLED(TLS)) {
  *         ...
  *     }
  */
 # if !defined OPENSSL_NO_TRACE && !defined FIPS_MODULE
 
 #  define OSSL_TRACE_ENABLED(category) \
     OSSL_trace_enabled(OSSL_TRACE_CATEGORY_##category)
 
 # else
 
 #  define OSSL_TRACE_ENABLED(category) (0)
 
 # endif
 
 /*
  * OSSL_TRACE*() - OneShot Trace Macros
  *
  * These macros are intended to produce a simple printf-style trace output.
  * Unfortunately, C90 macros don't support variable arguments, so the
  * "vararg" OSSL_TRACEV() macro has a rather weird usage pattern:
  *
  *    OSSL_TRACEV(category, (trc_out, "format string", ...args...));
  *
  * Where 'channel' is the literal symbol of this name, not a variable.
  * For that reason, it is currently not intended to be used directly,
  * but only as helper macro for the other oneshot trace macros
  * OSSL_TRACE(), OSSL_TRACE1(), OSSL_TRACE2(), ...
  *
  * Usage:
  *
  *    OSSL_TRACE(INIT, "Hello world!\n");
  *    OSSL_TRACE1(TLS, "The answer is %d\n", 42);
  *    OSSL_TRACE2(TLS, "The ultimate question to answer %d is '%s'\n",
  *                42, "What do you get when you multiply six by nine?");
  */
 
 # if !defined OPENSSL_NO_TRACE && !defined FIPS_MODULE
 
 #  define OSSL_TRACEV(category, args) \
     OSSL_TRACE_BEGIN(category) \
         BIO_printf args; \
     OSSL_TRACE_END(category)
 
 # else
 
 #  define OSSL_TRACEV(category, args) ((void)0)
 
 # endif
 
 # define OSSL_TRACE(category, text) \
     OSSL_TRACEV(category, (trc_out, "%s", text))
 
 # define OSSL_TRACE1(category, format, arg1) \
     OSSL_TRACEV(category, (trc_out, format, arg1))
 # define OSSL_TRACE2(category, format, arg1, arg2) \
     OSSL_TRACEV(category, (trc_out, format, arg1, arg2))
 # define OSSL_TRACE3(category, format, arg1, arg2, arg3) \
     OSSL_TRACEV(category, (trc_out, format, arg1, arg2, arg3))
 # define OSSL_TRACE4(category, format, arg1, arg2, arg3, arg4) \
     OSSL_TRACEV(category, (trc_out, format, arg1, arg2, arg3, arg4))
 # define OSSL_TRACE5(category, format, arg1, arg2, arg3, arg4, arg5) \
     OSSL_TRACEV(category, (trc_out, format, arg1, arg2, arg3, arg4, arg5))
 # define OSSL_TRACE6(category, format, arg1, arg2, arg3, arg4, arg5, arg6) \
     OSSL_TRACEV(category, (trc_out, format, arg1, arg2, arg3, arg4, arg5, arg6))
 # define OSSL_TRACE7(category, format, arg1, arg2, arg3, arg4, arg5, arg6, arg7) \
     OSSL_TRACEV(category, (trc_out, format, arg1, arg2, arg3, arg4, arg5, arg6, arg7))
 # define OSSL_TRACE8(category, format, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8) \
     OSSL_TRACEV(category, (trc_out, format, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8))
 # define OSSL_TRACE9(category, format, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9) \
     OSSL_TRACEV(category, (trc_out, format, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9))
 
 #define OSSL_TRACE_STRING_MAX 80
 int OSSL_trace_string(BIO *out, int text, int full,
                       const unsigned char *data, size_t size);
 #define OSSL_TRACE_STRING(category, text, full, data, len) \
     OSSL_TRACE_BEGIN(category) { \
         OSSL_trace_string(trc_out, text, full, data, len);  \
     } OSSL_TRACE_END(category)
 
 # ifdef  __cplusplus
 }
 # endif
 
 #endif

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