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_X509V3_POLICY 9
45 # define OSSL_TRACE_CATEGORY_NUM 10
47 /* Returns the trace category number for the given |name| */
48 int OSSL_trace_get_category_num(const char *name);
50 /* Returns the trace category name for the given |num| */
51 const char *OSSL_trace_get_category_name(int num);
58 * Enables tracing for the given |category| by providing a BIO sink
59 * as |channel|. If a null pointer is passed as |channel|, an existing
60 * trace channel is removed and tracing for the category is disabled.
62 * Returns 1 on success and 0 on failure
64 int OSSL_trace_set_channel(int category, BIO* channel);
67 * Attach a prefix and a suffix to the given |category|, to be printed at the
68 * beginning and at the end of each trace output group, i.e. when
69 * OSSL_trace_begin() and OSSL_trace_end() are called.
70 * If a null pointer is passed as argument, the existing prefix or suffix is
73 * They return 1 on success and 0 on failure
75 int OSSL_trace_set_prefix(int category, const char *prefix);
76 int OSSL_trace_set_suffix(int category, const char *suffix);
79 * OSSL_trace_cb is the type tracing callback provided by the application.
80 * It MUST return the number of bytes written, or 0 on error (in other words,
81 * it can never write zero bytes).
83 * The |buffer| will always contain text, which may consist of several lines.
84 * The |data| argument points to whatever data was provided by the application
85 * when registering the tracer function.
87 * The |category| number is given, as well as a |cmd| number, described below.
89 typedef size_t (*OSSL_trace_cb)(const char *buffer, size_t count,
90 int category, int cmd, void *data);
92 * Possible |cmd| numbers.
94 # define OSSL_TRACE_CTRL_BEGIN 0
95 # define OSSL_TRACE_CTRL_DURING 1
96 # define OSSL_TRACE_CTRL_END 2
99 * Enables tracing for the given |category| by creating an internal
100 * trace channel which sends the output to the given |callback|.
101 * If a null pointer is passed as callback, an existing trace channel
102 * is removed and tracing for the category is disabled.
104 * NOTE: OSSL_trace_set_channel() and OSSL_trace_set_callback() are mutually
107 * Returns 1 on success and 0 on failure
109 int OSSL_trace_set_callback(int category, OSSL_trace_cb callback, void *data);
116 * Returns 1 if tracing for the specified category is enabled, otherwise 0
118 int OSSL_trace_enabled(int category);
121 * Wrap a group of tracing output calls. OSSL_trace_begin() locks tracing and
122 * returns the trace channel associated with the given category, or NULL if no
123 * channel is associated with the category. OSSL_trace_end() unlocks tracing.
128 * if ((out = OSSL_trace_begin(category)) != NULL) {
130 * BIO_fprintf(out, ...);
132 * OSSL_trace_end(category, out);
135 * See also the convenience macros OSSL_TRACE_BEGIN and OSSL_TRACE_END below.
137 BIO *OSSL_trace_begin(int category);
138 void OSSL_trace_end(int category, BIO *channel);
141 * OSSL_TRACE* Convenience Macros
145 * When the tracing feature is disabled, these macros are defined to
146 * produce dead code, which a good compiler should eliminate.
150 * OSSL_TRACE_BEGIN, OSSL_TRACE_END - Define a Trace Group
152 * These two macros can be used to create a block which is executed only
153 * if the corresponding trace category is enabled. Inside this block, a
154 * local variable named |trc_out| is defined, which points to the channel
155 * associated with the given trace category.
157 * Usage: (using 'TLS' as an example category)
159 * OSSL_TRACE_BEGIN(TLS) {
161 * BIO_fprintf(trc_out, ... );
163 * } OSSL_TRACE_END(TLS);
166 * This expands to the following code
169 * BIO *trc_out = OSSL_trace_begin(OSSL_TRACE_CATEGORY_TLS);
170 * if (trc_out != NULL) {
172 * BIO_fprintf(trc_out, ...);
174 * OSSL_trace_end(OSSL_TRACE_CATEGORY_TLS, trc_out);
177 * The use of the inner '{...}' group and the trailing ';' is enforced
178 * by the definition of the macros in order to make the code look as much
179 * like C code as possible.
181 * Before returning from inside the trace block, it is necessary to
182 * call OSSL_TRACE_CANCEL(category).
185 # ifndef OPENSSL_NO_TRACE
187 # define OSSL_TRACE_BEGIN(category) \
189 BIO *trc_out = OSSL_trace_begin(OSSL_TRACE_CATEGORY_##category); \
193 # define OSSL_TRACE_END(category) \
194 OSSL_trace_end(OSSL_TRACE_CATEGORY_##category, trc_out); \
197 # define OSSL_TRACE_CANCEL(category) \
198 OSSL_trace_end(OSSL_TRACE_CATEGORY_##category, trc_out) \
202 # define OSSL_TRACE_BEGIN(category) \
204 BIO *trc_out = NULL; \
207 # define OSSL_TRACE_END(category) \
210 # define OSSL_TRACE_CANCEL(category) \
216 * OSSL_TRACE_ENABLED() - Check whether tracing is enabled for |category|
220 * if (OSSL_TRACE_ENABLED(TLS)) {
224 # ifndef OPENSSL_NO_TRACE
226 # define OSSL_TRACE_ENABLED(category) \
227 OSSL_trace_enabled(OSSL_TRACE_CATEGORY_##category)
231 # define OSSL_TRACE_ENABLED(category) (0)
236 * OSSL_TRACE*() - OneShot Trace Macros
238 * These macros are intended to produce a simple printf-style trace output.
239 * Unfortunately, C90 macros don't support variable arguments, so the
240 * "vararg" OSSL_TRACEV() macro has a rather weird usage pattern:
242 * OSSL_TRACEV(category, (trc_out, "format string", ...args...));
244 * Where 'channel' is the literal symbol of this name, not a variable.
245 * For that reason, it is currently not intended to be used directly,
246 * but only as helper macro for the other oneshot trace macros
247 * OSSL_TRACE(), OSSL_TRACE1(), OSSL_TRACE2(), ...
251 * OSSL_TRACE(INIT, "Hello world!\n");
252 * OSSL_TRACE1(TLS, "The answer is %d\n", 42);
253 * OSSL_TRACE2(TLS, "The ultimate question to answer %d is '%s'\n",
254 * 42, "What do you get when you multiply six by nine?");
257 # define OSSL_TRACEV(category, args) \
258 OSSL_TRACE_BEGIN(category) \
260 OSSL_TRACE_END(category)
262 # define OSSL_TRACE(category, text) \
263 OSSL_TRACEV(category, (trc_out, "%s", text))
265 # define OSSL_TRACE1(category, format, arg1) \
266 OSSL_TRACEV(category, (trc_out, format, arg1))
267 # define OSSL_TRACE2(category, format, arg1, arg2) \
268 OSSL_TRACEV(category, (trc_out, format, arg1, arg2))
269 # define OSSL_TRACE3(category, format, arg1, arg2, arg3) \
270 OSSL_TRACEV(category, (trc_out, format, arg1, arg2, arg3))
271 # define OSSL_TRACE4(category, format, arg1, arg2, arg3, arg4) \
272 OSSL_TRACEV(category, (trc_out, format, arg1, arg2, arg3, arg4))
273 # define OSSL_TRACE5(category, format, arg1, arg2, arg3, arg4, arg5) \
274 OSSL_TRACEV(category, (trc_out, format, arg1, arg2, arg3, arg4, arg5))
275 # define OSSL_TRACE6(category, format, arg1, arg2, arg3, arg4, arg5, arg6) \
276 OSSL_TRACEV(category, (trc_out, format, arg1, arg2, arg3, arg4, arg5, arg6))
277 # define OSSL_TRACE7(category, format, arg1, arg2, arg3, arg4, arg5, arg6, arg7) \
278 OSSL_TRACEV(category, (trc_out, format, arg1, arg2, arg3, arg4, arg5, arg6, arg7))
279 # define OSSL_TRACE8(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))
281 # define OSSL_TRACE9(category, format, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8) \
282 OSSL_TRACEV(category, (trc_out, format, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9))