2 * Copyright 2019 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
15 # include <openssl/bio.h>
26 * The trace messages of the OpenSSL libraries are organized into different
27 * categories. For every trace category, the application can register a separate
28 * tracer callback. When a callback is registered, a so called trace channel is
29 * created for this category. This channel consists essentially of an internal
30 * BIO which sends all trace output it receives to the registered application
33 * The ANY category is used as a fallback category.
35 # define OSSL_TRACE_CATEGORY_ANY 0 /* The fallback */
36 # define OSSL_TRACE_CATEGORY_INIT 1
37 # define OSSL_TRACE_CATEGORY_TLS 2
38 # define OSSL_TRACE_CATEGORY_TLS_CIPHER 3
39 # define OSSL_TRACE_CATEGORY_ENGINE_CONF 4
40 # define OSSL_TRACE_CATEGORY_ENGINE_TABLE 5
41 # define OSSL_TRACE_CATEGORY_ENGINE_REF_COUNT 6
42 # define OSSL_TRACE_CATEGORY_PKCS5V2 7
43 # define OSSL_TRACE_CATEGORY_NUM 8
45 /* Returns the trace category number for the given |name| */
46 int OSSL_trace_get_category_num(const char *name);
48 /* Returns the trace category name for the given |num| */
49 const char *OSSL_trace_get_category_name(int num);
56 * Enables tracing for the given |category| by providing a BIO sink
57 * as |channel|. If a null pointer is passed as |channel|, an existing
58 * trace channel is removed and tracing for the category is disabled.
60 * Returns 1 on success and 0 on failure
62 int OSSL_trace_set_channel(int category, BIO* channel);
65 * Attach a prefix and a suffix to the given |category|, to be printed at the
66 * beginning and at the end of each trace output group, i.e. when
67 * OSSL_trace_begin() and OSSL_trace_end() are called.
68 * If a null pointer is passed as argument, the existing prefix or suffix is
71 * They return 1 on success and 0 on failure
73 int OSSL_trace_set_prefix(int category, const char *prefix);
74 int OSSL_trace_set_suffix(int category, const char *suffix);
77 * OSSL_trace_cb is the type tracing callback provided by the application.
78 * It MUST return the number of bytes written, or 0 on error (in other words,
79 * it can never write zero bytes).
81 * The |buffer| will always contain text, which may consist of several lines.
82 * The |data| argument points to whatever data was provided by the application
83 * when registering the tracer function.
85 * The |category| number is given, as well as a |cmd| number, described below.
87 typedef size_t (*OSSL_trace_cb)(const char *buffer, size_t count,
88 int category, int cmd, void *data);
90 * Possible |cmd| numbers.
92 # define OSSL_TRACE_CTRL_BEGIN 0
93 # define OSSL_TRACE_CTRL_DURING 1
94 # define OSSL_TRACE_CTRL_END 2
97 * Enables tracing for the given |category| by creating an internal
98 * trace channel which sends the output to the given |callback|.
99 * If a null pointer is passed as callback, an existing trace channel
100 * is removed and tracing for the category is disabled.
102 * NOTE: OSSL_trace_set_channel() and OSSL_trace_set_callback() are mutually
105 * Returns 1 on success and 0 on failure
107 int OSSL_trace_set_callback(int category, OSSL_trace_cb callback, void *data);
114 * Returns 1 if tracing for the specified category is enabled, otherwise 0
116 int OSSL_trace_enabled(int category);
119 * Wrap a group of tracing output calls. OSSL_trace_begin() locks tracing and
120 * returns the trace channel associated with the given category, or NULL if no
121 * channel is associated with the category. OSSL_trace_end() unlocks tracing.
126 * if ((out = OSSL_trace_begin(category)) != NULL) {
128 * BIO_fprintf(out, ...);
130 * OSSL_trace_end(category, out);
133 * See also the convenience macros OSSL_TRACE_BEGIN and OSSL_TRACE_END below.
135 BIO *OSSL_trace_begin(int category);
136 void OSSL_trace_end(int category, BIO *channel);
139 * OSSL_TRACE* Convenience Macros
143 * When the tracing feature is disabled, these macros are defined to
144 * produce dead code, which a good compiler should eliminate.
148 * OSSL_TRACE_BEGIN, OSSL_TRACE_END - Define a Trace Group
150 * These two macros can be used to create a block which is executed only
151 * if the corresponding trace category is enabled. Inside this block, a
152 * local variable named |trc_out| is defined, which points to the channel
153 * associated with the given trace category.
155 * Usage: (using 'TLS' as an example category)
157 * OSSL_TRACE_BEGIN(TLS) {
159 * BIO_fprintf(trc_out, ... );
161 * } OSSL_TRACE_END(TLS);
164 * This expands to the following code
167 * BIO *trc_out = OSSL_trace_begin(OSSL_TRACE_CATEGORY_TLS);
168 * if (trc_out != NULL) {
170 * BIO_fprintf(trc_out, ...);
172 * OSSL_trace_end(OSSL_TRACE_CATEGORY_TLS, trc_out);
175 * The use of the inner '{...}' group and the trailing ';' is enforced
176 * by the definition of the macros in order to make the code look as much
177 * like C code as possible.
179 * Before returning from inside the trace block, it is necessary to
180 * call OSSL_TRACE_CANCEL(category).
183 # ifndef OPENSSL_NO_TRACE
185 # define OSSL_TRACE_BEGIN(category) \
187 BIO *trc_out = OSSL_trace_begin(OSSL_TRACE_CATEGORY_##category); \
191 # define OSSL_TRACE_END(category) \
192 OSSL_trace_end(OSSL_TRACE_CATEGORY_##category, trc_out); \
195 # define OSSL_TRACE_CANCEL(category) \
196 OSSL_trace_end(OSSL_TRACE_CATEGORY_##category, trc_out) \
200 # define OSSL_TRACE_BEGIN(category) \
202 BIO *trc_out = NULL; \
205 # define OSSL_TRACE_END(category) \
208 # define OSSL_TRACE_CANCEL(category) \
214 * OSSL_TRACE_ENABLED() - Check whether tracing is enabled for |category|
218 * if (OSSL_TRACE_ENABLED(TLS)) {
222 # ifndef OPENSSL_NO_TRACE
224 # define OSSL_TRACE_ENABLED(category) \
225 OSSL_trace_enabled(OSSL_TRACE_CATEGORY_##category)
229 # define OSSL_TRACE_ENABLED(category) (0)
234 * OSSL_TRACE*() - OneShot Trace Macros
236 * These macros are intended to produce a simple printf-style trace output.
237 * Unfortunately, C90 macros don't support variable arguments, so the
238 * "vararg" OSSL_TRACEV() macro has a rather weird usage pattern:
240 * OSSL_TRACEV(category, (trc_out, "format string", ...args...));
242 * Where 'channel' is the literal symbol of this name, not a variable.
243 * For that reason, it is currently not intended to be used directly,
244 * but only as helper macro for the other oneshot trace macros
245 * OSSL_TRACE(), OSSL_TRACE1(), OSSL_TRACE2(), ...
249 * OSSL_TRACE(INIT, "Hello world!\n");
250 * OSSL_TRACE1(TLS, "The answer is %d\n", 42);
251 * OSSL_TRACE2(TLS, "The ultimate question to answer %d is '%s'\n",
252 * 42, "What do you get when you multiply six by nine?");
255 # define OSSL_TRACEV(category, args) \
256 OSSL_TRACE_BEGIN(category) \
258 OSSL_TRACE_END(category)
260 # define OSSL_TRACE(category, text) \
261 OSSL_TRACEV(category, (trc_out, "%s", text))
263 # define OSSL_TRACE1(category, format, arg1) \
264 OSSL_TRACEV(category, (trc_out, format, arg1))
265 # define OSSL_TRACE2(category, format, arg1, arg2) \
266 OSSL_TRACEV(category, (trc_out, format, arg1, arg2))
267 # define OSSL_TRACE3(category, format, arg1, arg2, arg3) \
268 OSSL_TRACEV(category, (trc_out, format, arg1, arg2, arg3))
269 # define OSSL_TRACE4(category, format, arg1, arg2, arg3, arg4) \
270 OSSL_TRACEV(category, (trc_out, format, arg1, arg2, arg3, arg4))
271 # define OSSL_TRACE5(category, format, arg1, arg2, arg3, arg4, arg5) \
272 OSSL_TRACEV(category, (trc_out, format, arg1, arg2, arg3, arg4, arg5))
273 # define OSSL_TRACE6(category, format, arg1, arg2, arg3, arg4, arg5, arg6) \
274 OSSL_TRACEV(category, (trc_out, format, arg1, arg2, arg3, arg4, arg5, arg6))
275 # define OSSL_TRACE7(category, format, arg1, arg2, arg3, arg4, arg5, arg6, arg7) \
276 OSSL_TRACEV(category, (trc_out, format, arg1, arg2, arg3, arg4, arg5, arg6, arg7))
277 # define OSSL_TRACE8(category, format, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8) \
278 OSSL_TRACEV(category, (trc_out, format, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8))
279 # define OSSL_TRACE9(category, format, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8) \
280 OSSL_TRACEV(category, (trc_out, format, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9))