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/*
* Copyright (c) 2018 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.
*/
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.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);
}
void
fido_log_init(void)
{
logging = 1;
log_handler = log_on_stderr;
}
void
fido_log_debug(const char *fmt, ...)
{
char line[LINELEN];
va_list ap;
int r;
if (!logging || log_handler == NULL)
return;
va_start(ap, fmt);
r = vsnprintf(line, sizeof(line) - 1, fmt, ap);
va_end(ap);
if (r < 0 || (size_t)r >= sizeof(line) - 1)
return;
strlcat(line, "\n", sizeof(line));
log_handler(line);
}
void
fido_log_xxd(const void *buf, size_t count)
{
const uint8_t *ptr = buf;
char row[XXDROW];
char xxd[XXDLEN];
if (!logging || log_handler == NULL || count == 0)
return;
*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_set_log_handler(fido_log_handler_t *handler)
{
if (handler != NULL)
log_handler = handler;
}
#endif /* !FIDO_NO_DIAGNOSTIC */
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