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
13 #include <openssl/bio.h>
14 #include <openssl/crypto.h>
15 #include <openssl/trace.h>
16 #include "internal/bio.h"
17 #include "internal/nelem.h"
18 #include "internal/cryptlib_int.h"
20 #include "e_os.h" /* strcasecmp for Windows */
22 #ifndef OPENSSL_NO_TRACE
24 static CRYPTO_RWLOCK *trace_lock = NULL;
26 static const BIO *current_channel = NULL;
29 * INTERNAL TRACE CHANNEL IMPLEMENTATION
31 * For our own flexibility, all trace categories are associated with a
32 * BIO sink object, also called the trace channel. Instead of a BIO object,
33 * the application can also provide a callback function, in which case an
34 * internal trace channel is attached, which simply calls the registered
37 static int trace_write(BIO *b, const char *buf,
38 size_t num, size_t *written);
39 static int trace_puts(BIO *b, const char *str);
40 static long trace_ctrl(BIO *channel, int cmd, long argl, void *argp);
41 static int trace_free(BIO *b);
43 static const BIO_METHOD trace_method = {
52 trace_ctrl, /* ctrl */
54 trace_free, /* free */
55 NULL, /* callback_ctrl */
58 struct trace_data_st {
59 OSSL_trace_cb callback;
64 static int trace_write(BIO *channel,
65 const char *buf, size_t num, size_t *written)
67 struct trace_data_st *ctx = BIO_get_data(channel);
68 size_t cnt = ctx->callback(buf, num, ctx->category, OSSL_TRACE_CTRL_WRITE,
75 static int trace_puts(BIO *channel, const char *str)
79 if (trace_write(channel, str, strlen(str), &written))
85 static long trace_ctrl(BIO *channel, int cmd, long argl, void *argp)
87 struct trace_data_st *ctx = BIO_get_data(channel);
90 case OSSL_TRACE_CTRL_BEGIN:
91 case OSSL_TRACE_CTRL_END:
92 /* We know that the callback is likely to return 0 here */
93 ctx->callback("", 0, ctx->category, cmd, ctx->data);
98 return -2; /* Unsupported */
101 static int trace_free(BIO *channel)
105 OPENSSL_free(BIO_get_data(channel));
114 /* Helper struct and macro to get name string to number mapping */
115 struct trace_category_st {
116 const char * const name;
119 #define TRACE_CATEGORY_(name) { #name, OSSL_TRACE_CATEGORY_##name }
121 static const struct trace_category_st trace_categories[] = {
122 TRACE_CATEGORY_(ALL),
123 TRACE_CATEGORY_(TRACE),
124 TRACE_CATEGORY_(INIT),
125 TRACE_CATEGORY_(TLS),
126 TRACE_CATEGORY_(TLS_CIPHER),
127 TRACE_CATEGORY_(CONF),
128 TRACE_CATEGORY_(ENGINE_TABLE),
129 TRACE_CATEGORY_(ENGINE_REF_COUNT),
130 TRACE_CATEGORY_(PKCS5V2),
131 TRACE_CATEGORY_(PKCS12_KEYGEN),
132 TRACE_CATEGORY_(PKCS12_DECRYPT),
133 TRACE_CATEGORY_(X509V3_POLICY),
134 TRACE_CATEGORY_(BN_CTX),
135 TRACE_CATEGORY_(PROV),
136 TRACE_CATEGORY_(FETCH),
139 const char *OSSL_trace_get_category_name(int num)
143 for (i = 0; i < OSSL_NELEM(trace_categories); i++)
144 if (trace_categories[i].num == num)
145 return trace_categories[i].name;
146 return NULL; /* not found */
149 int OSSL_trace_get_category_num(const char *name)
153 for (i = 0; i < OSSL_NELEM(trace_categories); i++)
154 if (strcasecmp(name, trace_categories[i].name) == 0)
155 return trace_categories[i].num;
156 return -1; /* not found */
159 #ifndef OPENSSL_NO_TRACE
161 /* We use one trace channel for each trace category */
163 enum { SIMPLE_CHANNEL, CALLBACK_CHANNEL } type;
167 } trace_channels[OSSL_TRACE_CATEGORY_NUM] = {
168 { 0, NULL, NULL, NULL },
173 #ifndef OPENSSL_NO_TRACE
181 static int trace_attach_cb(int category, int type, const void *data)
185 OSSL_TRACE2(TRACE, "Attach channel %p to category '%s'\n",
186 data, trace_categories[category].name);
189 OSSL_TRACE2(TRACE, "Attach prefix \"%s\" to category '%s'\n",
190 (const char *)data, trace_categories[category].name);
193 OSSL_TRACE2(TRACE, "Attach suffix \"%s\" to category '%s'\n",
194 (const char *)data, trace_categories[category].name);
196 default: /* No clue */
202 static int trace_detach_cb(int category, int type, const void *data)
206 OSSL_TRACE2(TRACE, "Detach channel %p from category '%s'\n",
207 data, trace_categories[category].name);
210 OSSL_TRACE2(TRACE, "Detach prefix \"%s\" from category '%s'\n",
211 (const char *)data, trace_categories[category].name);
214 OSSL_TRACE2(TRACE, "Detach suffix \"%s\" from category '%s'\n",
215 (const char *)data, trace_categories[category].name);
217 default: /* No clue */
223 static int set_trace_data(int category, int type, BIO **channel,
224 const char **prefix, const char **suffix,
225 int (*attach_cb)(int, int, const void *),
226 int (*detach_cb)(int, int, const void *))
228 BIO *curr_channel = NULL;
229 char *curr_prefix = NULL;
230 char *curr_suffix = NULL;
232 /* Ensure ossl_trace_init() is called */
233 OPENSSL_init_crypto(0, NULL);
235 curr_channel = trace_channels[category].bio;
236 curr_prefix = trace_channels[category].prefix;
237 curr_suffix = trace_channels[category].suffix;
239 /* Make sure to run the detach callback first on all data */
240 if (prefix != NULL && curr_prefix != NULL) {
241 detach_cb(category, PREFIX, curr_prefix);
244 if (suffix != NULL && curr_suffix != NULL) {
245 detach_cb(category, SUFFIX, curr_suffix);
248 if (channel != NULL && curr_channel != NULL) {
249 detach_cb(category, CHANNEL, curr_channel);
252 /* After detach callbacks are done, clear data where appropriate */
253 if (prefix != NULL && curr_prefix != NULL) {
254 OPENSSL_free(curr_prefix);
255 trace_channels[category].prefix = NULL;
258 if (suffix != NULL && curr_suffix != NULL) {
259 OPENSSL_free(curr_suffix);
260 trace_channels[category].suffix = NULL;
263 if (channel != NULL && curr_channel != NULL) {
264 BIO_free(curr_channel);
265 trace_channels[category].type = 0;
266 trace_channels[category].bio = NULL;
269 /* Before running callbacks are done, set new data where appropriate */
270 if (channel != NULL && *channel != NULL) {
271 trace_channels[category].type = type;
272 trace_channels[category].bio = *channel;
275 if (prefix != NULL && *prefix != NULL) {
276 if ((curr_prefix = OPENSSL_strdup(*prefix)) == NULL)
278 trace_channels[category].prefix = curr_prefix;
281 if (suffix != NULL && *suffix != NULL) {
282 if ((curr_suffix = OPENSSL_strdup(*suffix)) == NULL)
284 trace_channels[category].suffix = curr_suffix;
287 /* Finally, run the attach callback on the new data */
288 if (channel != NULL && *channel != NULL) {
289 attach_cb(category, CHANNEL, *channel);
292 if (prefix != NULL && *prefix != NULL) {
293 attach_cb(category, PREFIX, *prefix);
296 if (suffix != NULL && *suffix != NULL) {
297 attach_cb(category, SUFFIX, *suffix);
304 int ossl_trace_init(void)
306 #ifndef OPENSSL_NO_TRACE
307 trace_lock = CRYPTO_THREAD_lock_new();
308 if (trace_lock == NULL)
315 void ossl_trace_cleanup(void)
317 #ifndef OPENSSL_NO_TRACE
320 const char *prefix = NULL;
321 const char *suffix = NULL;
323 for (category = 0; category < OSSL_TRACE_CATEGORY_NUM; category++) {
324 /* We force the TRACE category to be treated last */
325 if (category == OSSL_TRACE_CATEGORY_TRACE)
327 set_trace_data(category, 0, &channel, &prefix, &suffix,
328 trace_attach_cb, trace_detach_cb);
330 set_trace_data(OSSL_TRACE_CATEGORY_TRACE, 0, &channel,
332 trace_attach_cb, trace_detach_cb);
333 CRYPTO_THREAD_lock_free(trace_lock);
337 int OSSL_trace_set_channel(int category, BIO *channel)
339 #ifndef OPENSSL_NO_TRACE
340 if (category >= 0 && category < OSSL_TRACE_CATEGORY_NUM)
341 return set_trace_data(category, SIMPLE_CHANNEL, &channel, NULL, NULL,
342 trace_attach_cb, trace_detach_cb);
347 #ifndef OPENSSL_NO_TRACE
348 static int trace_attach_w_callback_cb(int category, int type, const void *data)
353 "Attach channel %p to category '%s' (with callback)\n",
354 data, trace_categories[category].name);
357 OSSL_TRACE2(TRACE, "Attach prefix \"%s\" to category '%s'\n",
358 (const char *)data, trace_categories[category].name);
361 OSSL_TRACE2(TRACE, "Attach suffix \"%s\" to category '%s'\n",
362 (const char *)data, trace_categories[category].name);
364 default: /* No clue */
371 int OSSL_trace_set_callback(int category, OSSL_trace_cb callback, void *data)
373 #ifndef OPENSSL_NO_TRACE
375 struct trace_data_st *trace_data = NULL;
377 if (category < 0 || category >= OSSL_TRACE_CATEGORY_NUM)
380 if (callback != NULL) {
381 if ((channel = BIO_new(&trace_method)) == NULL
383 OPENSSL_zalloc(sizeof(struct trace_data_st))) == NULL)
386 trace_data->callback = callback;
387 trace_data->category = category;
388 trace_data->data = data;
390 BIO_set_data(channel, trace_data);
393 if (!set_trace_data(category, CALLBACK_CHANNEL, &channel, NULL, NULL,
394 trace_attach_w_callback_cb, trace_detach_cb))
401 OPENSSL_free(trace_data);
407 int OSSL_trace_set_prefix(int category, const char *prefix)
409 #ifndef OPENSSL_NO_TRACE
410 if (category >= 0 && category < OSSL_TRACE_CATEGORY_NUM)
411 return set_trace_data(category, 0, NULL, &prefix, NULL,
412 trace_attach_cb, trace_detach_cb);
417 int OSSL_trace_set_suffix(int category, const char *suffix)
419 #ifndef OPENSSL_NO_TRACE
420 if (category >= 0 && category < OSSL_TRACE_CATEGORY_NUM)
421 return set_trace_data(category, 0, NULL, NULL, &suffix,
422 trace_attach_cb, trace_detach_cb);
427 #ifndef OPENSSL_NO_TRACE
428 static int ossl_trace_get_category(int category)
430 if (category < 0 || category >= OSSL_TRACE_CATEGORY_NUM)
432 if (trace_channels[category].bio != NULL)
434 return OSSL_TRACE_CATEGORY_ALL;
438 int OSSL_trace_enabled(int category)
441 #ifndef OPENSSL_NO_TRACE
442 category = ossl_trace_get_category(category);
444 ret = trace_channels[category].bio != NULL;
449 BIO *OSSL_trace_begin(int category)
452 #ifndef OPENSSL_NO_TRACE
455 category = ossl_trace_get_category(category);
459 channel = trace_channels[category].bio;
460 prefix = trace_channels[category].prefix;
462 if (channel != NULL) {
463 CRYPTO_THREAD_write_lock(trace_lock);
464 current_channel = channel;
465 switch (trace_channels[category].type) {
467 if (prefix != NULL) {
468 (void)BIO_puts(channel, prefix);
469 (void)BIO_puts(channel, "\n");
472 case CALLBACK_CHANNEL:
473 (void)BIO_ctrl(channel, OSSL_TRACE_CTRL_BEGIN,
474 prefix == NULL ? 0 : strlen(prefix), prefix);
482 void OSSL_trace_end(int category, BIO * channel)
484 #ifndef OPENSSL_NO_TRACE
487 category = ossl_trace_get_category(category);
488 suffix = trace_channels[category].suffix;
490 && ossl_assert(channel == current_channel)) {
491 (void)BIO_flush(channel);
492 switch (trace_channels[category].type) {
494 if (suffix != NULL) {
495 (void)BIO_puts(channel, suffix);
496 (void)BIO_puts(channel, "\n");
499 case CALLBACK_CHANNEL:
500 (void)BIO_ctrl(channel, OSSL_TRACE_CTRL_END,
501 suffix == NULL ? 0 : strlen(suffix), suffix);
504 current_channel = NULL;
505 CRYPTO_THREAD_unlock(trace_lock);