/*
* 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
# define OSSL_TRACE_CATEGORY_PROVIDER 19
# define OSSL_TRACE_CATEGORY_QUERY 20
# define OSSL_TRACE_CATEGORY_NUM 21
/* 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
