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_PKCS12_KEYGEN 8
44 # define OSSL_TRACE_CATEGORY_NUM 9
46 /* Returns the trace category number for the given |name| */
47 int OSSL_trace_get_category_num(const char *name);
49 /* Returns the trace category name for the given |num| */
50 const char *OSSL_trace_get_category_name(int num);
57 * Enables tracing for the given |category| by providing a BIO sink
58 * as |channel|. If a null pointer is passed as |channel|, an existing
59 * trace channel is removed and tracing for the category is disabled.
61 * Returns 1 on success and 0 on failure
63 int OSSL_trace_set_channel(int category, BIO* channel);
66 * Attach a prefix and a suffix to the given |category|, to be printed at the
67 * beginning and at the end of each trace output group, i.e. when
68 * OSSL_trace_begin() and OSSL_trace_end() are called.
69 * If a null pointer is passed as argument, the existing prefix or suffix is
72 * They return 1 on success and 0 on failure
74 int OSSL_trace_set_prefix(int category, const char *prefix);
75 int OSSL_trace_set_suffix(int category, const char *suffix);
78 * OSSL_trace_cb is the type tracing callback provided by the application.
79 * It MUST return the number of bytes written, or 0 on error (in other words,
80 * it can never write zero bytes).
82 * The |buffer| will always contain text, which may consist of several lines.
83 * The |data| argument points to whatever data was provided by the application
84 * when registering the tracer function.
86 * The |category| number is given, as well as a |cmd| number, described below.
88 typedef size_t (*OSSL_trace_cb)(const char *buffer, size_t count,
89 int category, int cmd, void *data);
91 * Possible |cmd| numbers.
93 # define OSSL_TRACE_CTRL_BEGIN 0
94 # define OSSL_TRACE_CTRL_DURING 1
95 # define OSSL_TRACE_CTRL_END 2
98 * Enables tracing for the given |category| by creating an internal
99 * trace channel which sends the output to the given |callback|.
100 * If a null pointer is passed as callback, an existing trace channel
101 * is removed and tracing for the category is disabled.
103 * NOTE: OSSL_trace_set_channel() and OSSL_trace_set_callback() are mutually
106 * Returns 1 on success and 0 on failure
108 int OSSL_trace_set_callback(int category, OSSL_trace_cb callback, void *data);
115 * Returns 1 if tracing for the specified category is enabled, otherwise 0
117 int OSSL_trace_enabled(int category);
120 * Wrap a group of tracing output calls. OSSL_trace_begin() locks tracing and
121 * returns the trace channel associated with the given category, or NULL if no
122 * channel is associated with the category. OSSL_trace_end() unlocks tracing.
127 * if ((out = OSSL_trace_begin(category)) != NULL) {
129 * BIO_fprintf(out, ...);
131 * OSSL_trace_end(category, out);
134 * See also the convenience macros OSSL_TRACE_BEGIN and OSSL_TRACE_END below.
136 BIO *OSSL_trace_begin(int category);
137 void OSSL_trace_end(int category, BIO *channel);
140 * OSSL_TRACE* Convenience Macros
144 * When the tracing feature is disabled, these macros are defined to
145 * produce dead code, which a good compiler should eliminate.
149 * OSSL_TRACE_BEGIN, OSSL_TRACE_END - Define a Trace Group
151 * These two macros can be used to create a block which is executed only
152 * if the corresponding trace category is enabled. Inside this block, a
153 * local variable named |trc_out| is defined, which points to the channel
154 * associated with the given trace category.
156 * Usage: (using 'TLS' as an example category)
158 * OSSL_TRACE_BEGIN(TLS) {
160 * BIO_fprintf(trc_out, ... );
162 * } OSSL_TRACE_END(TLS);
165 * This expands to the following code
168 * BIO *trc_out = OSSL_trace_begin(OSSL_TRACE_CATEGORY_TLS);
169 * if (trc_out != NULL) {
171 * BIO_fprintf(trc_out, ...);
173 * OSSL_trace_end(OSSL_TRACE_CATEGORY_TLS, trc_out);
176 * The use of the inner '{...}' group and the trailing ';' is enforced
177 * by the definition of the macros in order to make the code look as much
178 * like C code as possible.
180 * Before returning from inside the trace block, it is necessary to
181 * call OSSL_TRACE_CANCEL(category).
184 # ifndef OPENSSL_NO_TRACE
186 # define OSSL_TRACE_BEGIN(category) \
188 BIO *trc_out = OSSL_trace_begin(OSSL_TRACE_CATEGORY_##category); \
192 # define OSSL_TRACE_END(category) \
193 OSSL_trace_end(OSSL_TRACE_CATEGORY_##category, trc_out); \
196 # define OSSL_TRACE_CANCEL(category) \
197 OSSL_trace_end(OSSL_TRACE_CATEGORY_##category, trc_out) \
201 # define OSSL_TRACE_BEGIN(category) \
203 BIO *trc_out = NULL; \
206 # define OSSL_TRACE_END(category) \
209 # define OSSL_TRACE_CANCEL(category) \
215 * OSSL_TRACE_ENABLED() - Check whether tracing is enabled for |category|
219 * if (OSSL_TRACE_ENABLED(TLS)) {
223 # ifndef OPENSSL_NO_TRACE
225 # define OSSL_TRACE_ENABLED(category) \
226 OSSL_trace_enabled(OSSL_TRACE_CATEGORY_##category)
230 # define OSSL_TRACE_ENABLED(category) (0)
235 * OSSL_TRACE*() - OneShot Trace Macros
237 * These macros are intended to produce a simple printf-style trace output.
238 * Unfortunately, C90 macros don't support variable arguments, so the
239 * "vararg" OSSL_TRACEV() macro has a rather weird usage pattern:
241 * OSSL_TRACEV(category, (trc_out, "format string", ...args...));
243 * Where 'channel' is the literal symbol of this name, not a variable.
244 * For that reason, it is currently not intended to be used directly,
245 * but only as helper macro for the other oneshot trace macros
246 * OSSL_TRACE(), OSSL_TRACE1(), OSSL_TRACE2(), ...
250 * OSSL_TRACE(INIT, "Hello world!\n");
251 * OSSL_TRACE1(TLS, "The answer is %d\n", 42);
252 * OSSL_TRACE2(TLS, "The ultimate question to answer %d is '%s'\n",
253 * 42, "What do you get when you multiply six by nine?");
256 # define OSSL_TRACEV(category, args) \
257 OSSL_TRACE_BEGIN(category) \
259 OSSL_TRACE_END(category)
261 # define OSSL_TRACE(category, text) \
262 OSSL_TRACEV(category, (trc_out, "%s", text))
264 # define OSSL_TRACE1(category, format, arg1) \
265 OSSL_TRACEV(category, (trc_out, format, arg1))
266 # define OSSL_TRACE2(category, format, arg1, arg2) \
267 OSSL_TRACEV(category, (trc_out, format, arg1, arg2))
268 # define OSSL_TRACE3(category, format, arg1, arg2, arg3) \
269 OSSL_TRACEV(category, (trc_out, format, arg1, arg2, arg3))
270 # define OSSL_TRACE4(category, format, arg1, arg2, arg3, arg4) \
271 OSSL_TRACEV(category, (trc_out, format, arg1, arg2, arg3, arg4))
272 # define OSSL_TRACE5(category, format, arg1, arg2, arg3, arg4, arg5) \
273 OSSL_TRACEV(category, (trc_out, format, arg1, arg2, arg3, arg4, arg5))
274 # define OSSL_TRACE6(category, format, arg1, arg2, arg3, arg4, arg5, arg6) \
275 OSSL_TRACEV(category, (trc_out, format, arg1, arg2, arg3, arg4, arg5, arg6))
276 # define OSSL_TRACE7(category, format, arg1, arg2, arg3, arg4, arg5, arg6, arg7) \
277 OSSL_TRACEV(category, (trc_out, format, arg1, arg2, arg3, arg4, arg5, arg6, arg7))
278 # define OSSL_TRACE8(category, format, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8) \
279 OSSL_TRACEV(category, (trc_out, format, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8))
280 # define OSSL_TRACE9(category, format, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8) \
281 OSSL_TRACEV(category, (trc_out, format, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9))