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/*
* Copyright 2017-2025 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <string.h>
#include <openssl/opensslconf.h>
#include <openssl/trace.h>
#include "apps.h"
#include "../testutil.h"
#ifndef OPENSSL_NO_TRACE
typedef struct tracedata_st {
BIO *bio;
unsigned int ingroup:1;
} tracedata;
static size_t internal_trace_cb(const char *buf, size_t cnt,
int category, int cmd, void *vdata)
{
int ret = 0;
tracedata *trace_data = vdata;
char buffer[256], *hex;
CRYPTO_THREAD_ID tid;
switch (cmd) {
case OSSL_TRACE_CTRL_BEGIN:
trace_data->ingroup = 1;
tid = CRYPTO_THREAD_get_current_id();
hex = OPENSSL_buf2hexstr((const unsigned char *)&tid, sizeof(tid));
BIO_snprintf(buffer, sizeof(buffer), "TRACE[%s]:%s: ",
hex, OSSL_trace_get_category_name(category));
OPENSSL_free(hex);
BIO_set_prefix(trace_data->bio, buffer);
break;
case OSSL_TRACE_CTRL_WRITE:
ret = BIO_write(trace_data->bio, buf, cnt);
break;
case OSSL_TRACE_CTRL_END:
trace_data->ingroup = 0;
BIO_set_prefix(trace_data->bio, NULL);
break;
}
return ret < 0 ? 0 : ret;
}
DEFINE_STACK_OF(tracedata)
static STACK_OF(tracedata) *trace_data_stack;
static void tracedata_free(tracedata *data)
{
BIO_free_all(data->bio);
OPENSSL_free(data);
}
static STACK_OF(tracedata) *trace_data_stack;
static void cleanup_trace(void)
{
sk_tracedata_pop_free(trace_data_stack, tracedata_free);
}
static void setup_trace_category(int category)
{
BIO *channel;
tracedata *trace_data;
BIO *bio = NULL;
if (OSSL_trace_enabled(category))
return;
bio = BIO_new(BIO_f_prefix());
channel = BIO_push(bio,
BIO_new_fp(stderr, BIO_NOCLOSE | BIO_FP_TEXT));
trace_data = OPENSSL_zalloc(sizeof(*trace_data));
if (trace_data == NULL
|| bio == NULL
|| (trace_data->bio = channel) == NULL
|| OSSL_trace_set_callback(category, internal_trace_cb,
trace_data) == 0
|| sk_tracedata_push(trace_data_stack, trace_data) == 0) {
fprintf(stderr,
"warning: unable to setup trace callback for category '%s'.\n",
OSSL_trace_get_category_name(category));
OPENSSL_free(trace_data);
OSSL_trace_set_callback(category, NULL, NULL);
BIO_free_all(channel);
}
}
static void setup_trace(const char *str)
{
char *val;
/*
* We add this handler as early as possible to ensure it's executed
* as late as possible, i.e. after the TRACE code has done its cleanup
* (which happens last in OPENSSL_cleanup).
*/
atexit(cleanup_trace);
trace_data_stack = sk_tracedata_new_null();
val = OPENSSL_strdup(str);
if (val != NULL) {
char *valp = val;
char *item;
for (valp = val; (item = strtok(valp, ",")) != NULL; valp = NULL) {
int category = OSSL_trace_get_category_num(item);
if (category == OSSL_TRACE_CATEGORY_ALL) {
while (++category < OSSL_TRACE_CATEGORY_NUM)
setup_trace_category(category);
break;
} else if (category > 0) {
setup_trace_category(category);
} else {
fprintf(stderr,
"warning: unknown trace category: '%s'.\n", item);
}
}
}
OPENSSL_free(val);
}
#endif /* OPENSSL_NO_TRACE */
int global_init(void)
{
#ifndef OPENSSL_NO_TRACE
setup_trace(getenv("OPENSSL_TRACE"));
#endif
return 1;
}
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