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/*
* Copyright (c) 2018-2021 Yubico AB. All rights reserved.
* Use of this source code is governed by a BSD-style
* license that can be found in the LICENSE file.
* SPDX-License-Identifier: BSD-2-Clause
*/
#undef _GNU_SOURCE /* XSI strerror_r() */
#include <stdarg.h>
#include <stdio.h>
#include "fido.h"
#ifndef FIDO_NO_DIAGNOSTIC
#define XXDLEN 32
#define XXDROW 128
#define LINELEN 256
#ifndef TLS
#define TLS
#endif
static TLS int logging;
static TLS fido_log_handler_t *log_handler;
static void
log_on_stderr(const char *str)
{
fprintf(stderr, "%s", str);
}
static void
do_log(const char *suffix, const char *fmt, va_list args)
{
char line[LINELEN], body[LINELEN];
vsnprintf(body, sizeof(body), fmt, args);
if (suffix != NULL)
snprintf(line, sizeof(line), "%.180s: %.70s\n", body, suffix);
else
snprintf(line, sizeof(line), "%.180s\n", body);
log_handler(line);
}
void
fido_log_init(void)
{
logging = 1;
log_handler = log_on_stderr;
}
void
fido_log_debug(const char *fmt, ...)
{
va_list args;
if (!logging || log_handler == NULL)
return;
va_start(args, fmt);
do_log(NULL, fmt, args);
va_end(args);
}
void
fido_log_xxd(const void *buf, size_t count, const char *fmt, ...)
{
const uint8_t *ptr = buf;
char row[XXDROW], xxd[XXDLEN];
va_list args;
if (!logging || log_handler == NULL)
return;
snprintf(row, sizeof(row), "buf=%p, len=%zu", buf, count);
va_start(args, fmt);
do_log(row, fmt, args);
va_end(args);
*row = '\0';
for (size_t i = 0; i < count; i++) {
*xxd = '\0';
if (i % 16 == 0)
snprintf(xxd, sizeof(xxd), "%04zu: %02x", i, *ptr++);
else
snprintf(xxd, sizeof(xxd), " %02x", *ptr++);
strlcat(row, xxd, sizeof(row));
if (i % 16 == 15 || i == count - 1) {
fido_log_debug("%s", row);
*row = '\0';
}
}
}
void
fido_log_error(int errnum, const char *fmt, ...)
{
char errstr[LINELEN];
va_list args;
if (!logging || log_handler == NULL)
return;
if (strerror_r(errnum, errstr, sizeof(errstr)) != 0)
snprintf(errstr, sizeof(errstr), "error %d", errnum);
va_start(args, fmt);
do_log(errstr, fmt, args);
va_end(args);
}
void
fido_set_log_handler(fido_log_handler_t *handler)
{
if (handler != NULL)
log_handler = handler;
}
#endif /* !FIDO_NO_DIAGNOSTIC */
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