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trace.h
/* * 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 /* Count of available categories. */ # define OSSL_TRACE_CATEGORY_NUM 18 /* 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)) # ifdef __cplusplus } # endif #endif
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