2 * Copyright 2019-2021 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
10 #ifndef OPENSSL_TRACE_H
11 # define OPENSSL_TRACE_H
16 # include <openssl/bio.h>
27 * The trace messages of the OpenSSL libraries are organized into different
28 * categories. For every trace category, the application can register a separate
29 * tracer callback. When a callback is registered, a so called trace channel is
30 * created for this category. This channel consists essentially of an internal
31 * BIO which sends all trace output it receives to the registered application
34 * The ALL category can be used as a fallback category to register a single
35 * channel which receives the output from all categories. However, if the
36 * application intends to print the trace channel name in the line prefix,
37 * it is better to register channels for all categories separately.
38 * (This is how the openssl application does it.)
40 # define OSSL_TRACE_CATEGORY_ALL 0 /* The fallback */
41 # define OSSL_TRACE_CATEGORY_TRACE 1
42 # define OSSL_TRACE_CATEGORY_INIT 2
43 # define OSSL_TRACE_CATEGORY_TLS 3
44 # define OSSL_TRACE_CATEGORY_TLS_CIPHER 4
45 # define OSSL_TRACE_CATEGORY_CONF 5
46 # ifndef OPENSSL_NO_ENGINE
47 # define OSSL_TRACE_CATEGORY_ENGINE_TABLE 6
48 # define OSSL_TRACE_CATEGORY_ENGINE_REF_COUNT 7
50 # define OSSL_TRACE_CATEGORY_PKCS5V2 8
51 # define OSSL_TRACE_CATEGORY_PKCS12_KEYGEN 9
52 # define OSSL_TRACE_CATEGORY_PKCS12_DECRYPT 10
53 # define OSSL_TRACE_CATEGORY_X509V3_POLICY 11
54 # define OSSL_TRACE_CATEGORY_BN_CTX 12
55 # define OSSL_TRACE_CATEGORY_CMP 13
56 # define OSSL_TRACE_CATEGORY_STORE 14
57 # define OSSL_TRACE_CATEGORY_DECODER 15
58 # define OSSL_TRACE_CATEGORY_ENCODER 16
59 # define OSSL_TRACE_CATEGORY_REF_COUNT 17
60 /* Count of available categories. */
61 # define OSSL_TRACE_CATEGORY_NUM 18
63 /* Returns the trace category number for the given |name| */
64 int OSSL_trace_get_category_num(const char *name);
66 /* Returns the trace category name for the given |num| */
67 const char *OSSL_trace_get_category_name(int num);
74 * Enables tracing for the given |category| by providing a BIO sink
75 * as |channel|. If a null pointer is passed as |channel|, an existing
76 * trace channel is removed and tracing for the category is disabled.
78 * Returns 1 on success and 0 on failure
80 int OSSL_trace_set_channel(int category, BIO* channel);
83 * Attach a prefix and a suffix to the given |category|, to be printed at the
84 * beginning and at the end of each trace output group, i.e. when
85 * OSSL_trace_begin() and OSSL_trace_end() are called.
86 * If a null pointer is passed as argument, the existing prefix or suffix is
89 * They return 1 on success and 0 on failure
91 int OSSL_trace_set_prefix(int category, const char *prefix);
92 int OSSL_trace_set_suffix(int category, const char *suffix);
95 * OSSL_trace_cb is the type tracing callback provided by the application.
96 * It MUST return the number of bytes written, or 0 on error (in other words,
97 * it can never write zero bytes).
99 * The |buffer| will always contain text, which may consist of several lines.
100 * The |data| argument points to whatever data was provided by the application
101 * when registering the tracer function.
103 * The |category| number is given, as well as a |cmd| number, described below.
105 typedef size_t (*OSSL_trace_cb)(const char *buffer, size_t count,
106 int category, int cmd, void *data);
108 * Possible |cmd| numbers.
110 # define OSSL_TRACE_CTRL_BEGIN 0
111 # define OSSL_TRACE_CTRL_WRITE 1
112 # define OSSL_TRACE_CTRL_END 2
115 * Enables tracing for the given |category| by creating an internal
116 * trace channel which sends the output to the given |callback|.
117 * If a null pointer is passed as callback, an existing trace channel
118 * is removed and tracing for the category is disabled.
120 * NOTE: OSSL_trace_set_channel() and OSSL_trace_set_callback() are mutually
123 * Returns 1 on success and 0 on failure
125 int OSSL_trace_set_callback(int category, OSSL_trace_cb callback, void *data);
132 * Returns 1 if tracing for the specified category is enabled, otherwise 0
134 int OSSL_trace_enabled(int category);
137 * Wrap a group of tracing output calls. OSSL_trace_begin() locks tracing and
138 * returns the trace channel associated with the given category, or NULL if no
139 * channel is associated with the category. OSSL_trace_end() unlocks tracing.
144 * if ((out = OSSL_trace_begin(category)) != NULL) {
146 * BIO_fprintf(out, ...);
148 * OSSL_trace_end(category, out);
151 * See also the convenience macros OSSL_TRACE_BEGIN and OSSL_TRACE_END below.
153 BIO *OSSL_trace_begin(int category);
154 void OSSL_trace_end(int category, BIO *channel);
157 * OSSL_TRACE* Convenience Macros
161 * When the tracing feature is disabled, these macros are defined to
162 * produce dead code, which a good compiler should eliminate.
166 * OSSL_TRACE_BEGIN, OSSL_TRACE_END - Define a Trace Group
168 * These two macros can be used to create a block which is executed only
169 * if the corresponding trace category is enabled. Inside this block, a
170 * local variable named |trc_out| is defined, which points to the channel
171 * associated with the given trace category.
173 * Usage: (using 'TLS' as an example category)
175 * OSSL_TRACE_BEGIN(TLS) {
177 * BIO_fprintf(trc_out, ... );
179 * } OSSL_TRACE_END(TLS);
182 * This expands to the following code
185 * BIO *trc_out = OSSL_trace_begin(OSSL_TRACE_CATEGORY_TLS);
186 * if (trc_out != NULL) {
188 * BIO_fprintf(trc_out, ...);
190 * OSSL_trace_end(OSSL_TRACE_CATEGORY_TLS, trc_out);
193 * The use of the inner '{...}' group and the trailing ';' is enforced
194 * by the definition of the macros in order to make the code look as much
195 * like C code as possible.
197 * Before returning from inside the trace block, it is necessary to
198 * call OSSL_TRACE_CANCEL(category).
201 # if !defined OPENSSL_NO_TRACE && !defined FIPS_MODULE
203 # define OSSL_TRACE_BEGIN(category) \
205 BIO *trc_out = OSSL_trace_begin(OSSL_TRACE_CATEGORY_##category); \
209 # define OSSL_TRACE_END(category) \
210 OSSL_trace_end(OSSL_TRACE_CATEGORY_##category, trc_out); \
213 # define OSSL_TRACE_CANCEL(category) \
214 OSSL_trace_end(OSSL_TRACE_CATEGORY_##category, trc_out) \
218 # define OSSL_TRACE_BEGIN(category) \
220 BIO *trc_out = NULL; \
223 # define OSSL_TRACE_END(category) \
226 # define OSSL_TRACE_CANCEL(category) \
232 * OSSL_TRACE_ENABLED() - Check whether tracing is enabled for |category|
236 * if (OSSL_TRACE_ENABLED(TLS)) {
240 # if !defined OPENSSL_NO_TRACE && !defined FIPS_MODULE
242 # define OSSL_TRACE_ENABLED(category) \
243 OSSL_trace_enabled(OSSL_TRACE_CATEGORY_##category)
247 # define OSSL_TRACE_ENABLED(category) (0)
252 * OSSL_TRACE*() - OneShot Trace Macros
254 * These macros are intended to produce a simple printf-style trace output.
255 * Unfortunately, C90 macros don't support variable arguments, so the
256 * "vararg" OSSL_TRACEV() macro has a rather weird usage pattern:
258 * OSSL_TRACEV(category, (trc_out, "format string", ...args...));
260 * Where 'channel' is the literal symbol of this name, not a variable.
261 * For that reason, it is currently not intended to be used directly,
262 * but only as helper macro for the other oneshot trace macros
263 * OSSL_TRACE(), OSSL_TRACE1(), OSSL_TRACE2(), ...
267 * OSSL_TRACE(INIT, "Hello world!\n");
268 * OSSL_TRACE1(TLS, "The answer is %d\n", 42);
269 * OSSL_TRACE2(TLS, "The ultimate question to answer %d is '%s'\n",
270 * 42, "What do you get when you multiply six by nine?");
273 # if !defined OPENSSL_NO_TRACE && !defined FIPS_MODULE
275 # define OSSL_TRACEV(category, args) \
276 OSSL_TRACE_BEGIN(category) \
278 OSSL_TRACE_END(category)
282 # define OSSL_TRACEV(category, args) ((void)0)
286 # define OSSL_TRACE(category, text) \
287 OSSL_TRACEV(category, (trc_out, "%s", text))
289 # define OSSL_TRACE1(category, format, arg1) \
290 OSSL_TRACEV(category, (trc_out, format, arg1))
291 # define OSSL_TRACE2(category, format, arg1, arg2) \
292 OSSL_TRACEV(category, (trc_out, format, arg1, arg2))
293 # define OSSL_TRACE3(category, format, arg1, arg2, arg3) \
294 OSSL_TRACEV(category, (trc_out, format, arg1, arg2, arg3))
295 # define OSSL_TRACE4(category, format, arg1, arg2, arg3, arg4) \
296 OSSL_TRACEV(category, (trc_out, format, arg1, arg2, arg3, arg4))
297 # define OSSL_TRACE5(category, format, arg1, arg2, arg3, arg4, arg5) \
298 OSSL_TRACEV(category, (trc_out, format, arg1, arg2, arg3, arg4, arg5))
299 # define OSSL_TRACE6(category, format, arg1, arg2, arg3, arg4, arg5, arg6) \
300 OSSL_TRACEV(category, (trc_out, format, arg1, arg2, arg3, arg4, arg5, arg6))
301 # define OSSL_TRACE7(category, format, arg1, arg2, arg3, arg4, arg5, arg6, arg7) \
302 OSSL_TRACEV(category, (trc_out, format, arg1, arg2, arg3, arg4, arg5, arg6, arg7))
303 # define OSSL_TRACE8(category, format, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8) \
304 OSSL_TRACEV(category, (trc_out, format, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8))
305 # define OSSL_TRACE9(category, format, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9) \
306 OSSL_TRACEV(category, (trc_out, format, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9))