include/mbedtls/debug.h

/**
 * \file debug.h
 *
 * \brief Functions for controlling and providing debug output from the library.
 */
/*
 *  Copyright The Mbed TLS Contributors
 *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
 */
#ifndef MBEDTLS_DEBUG_H
#define MBEDTLS_DEBUG_H

#include "mbedtls/build_info.h"

#include "mbedtls/ssl.h"

#if defined(MBEDTLS_ECP_C)
#include "mbedtls/ecp.h"
#endif

#if defined(MBEDTLS_DEBUG_C)

#define MBEDTLS_DEBUG_STRIP_PARENS(...)   __VA_ARGS__

#define MBEDTLS_SSL_DEBUG_MSG(level, args)                    \
    mbedtls_debug_print_msg(ssl, level, __FILE__, __LINE__,    \
                            MBEDTLS_DEBUG_STRIP_PARENS args)

#define MBEDTLS_SSL_DEBUG_RET(level, text, ret)                \
    mbedtls_debug_print_ret(ssl, level, __FILE__, __LINE__, text, ret)

#define MBEDTLS_SSL_DEBUG_BUF(level, text, buf, len)           \
    mbedtls_debug_print_buf(ssl, level, __FILE__, __LINE__, text, buf, len)

#if defined(MBEDTLS_BIGNUM_C)
#define MBEDTLS_SSL_DEBUG_MPI(level, text, X)                  \
    mbedtls_debug_print_mpi(ssl, level, __FILE__, __LINE__, text, X)
#endif

#if defined(MBEDTLS_ECP_C)
#define MBEDTLS_SSL_DEBUG_ECP(level, text, X)                  \
    mbedtls_debug_print_ecp(ssl, level, __FILE__, __LINE__, text, X)
#endif

#if defined(MBEDTLS_X509_CRT_PARSE_C)
#if !defined(MBEDTLS_X509_REMOVE_INFO)
#define MBEDTLS_SSL_DEBUG_CRT(level, text, crt)                \
    mbedtls_debug_print_crt(ssl, level, __FILE__, __LINE__, text, crt)
#else
#define MBEDTLS_SSL_DEBUG_CRT(level, text, crt)       do { } while (0)
#endif /* MBEDTLS_X509_REMOVE_INFO */
#endif /* MBEDTLS_X509_CRT_PARSE_C */

#if defined(MBEDTLS_ECDH_C)
#define MBEDTLS_SSL_DEBUG_ECDH(level, ecdh, attr)               \
    mbedtls_debug_printf_ecdh(ssl, level, __FILE__, __LINE__, ecdh, attr)
#endif

#else /* MBEDTLS_DEBUG_C */

#define MBEDTLS_SSL_DEBUG_MSG(level, args)            do { } while (0)
#define MBEDTLS_SSL_DEBUG_RET(level, text, ret)       do { } while (0)
#define MBEDTLS_SSL_DEBUG_BUF(level, text, buf, len)  do { } while (0)
#define MBEDTLS_SSL_DEBUG_MPI(level, text, X)         do { } while (0)
#define MBEDTLS_SSL_DEBUG_ECP(level, text, X)         do { } while (0)
#define MBEDTLS_SSL_DEBUG_CRT(level, text, crt)       do { } while (0)
#define MBEDTLS_SSL_DEBUG_ECDH(level, ecdh, attr)     do { } while (0)

#endif /* MBEDTLS_DEBUG_C */

/**
 * \def MBEDTLS_PRINTF_ATTRIBUTE
 *
 * Mark a function as having printf attributes, and thus enable checking
 * via -wFormat and other flags. This does nothing on builds with compilers
 * that do not support the format attribute
 *
 * Module:  library/debug.c
 * Caller:
 *
 * This module provides debugging functions.
 */
#if defined(__has_attribute)
#if __has_attribute(format)
#if defined(__MINGW32__) && __USE_MINGW_ANSI_STDIO == 1
#define MBEDTLS_PRINTF_ATTRIBUTE(string_index, first_to_check)    \
    __attribute__((__format__(gnu_printf, string_index, first_to_check)))
#else /* defined(__MINGW32__) && __USE_MINGW_ANSI_STDIO == 1 */
#define MBEDTLS_PRINTF_ATTRIBUTE(string_index, first_to_check)    \
    __attribute__((format(printf, string_index, first_to_check)))
#endif
#else /* __has_attribute(format) */
#define MBEDTLS_PRINTF_ATTRIBUTE(string_index, first_to_check)
#endif /* __has_attribute(format) */
#else /* defined(__has_attribute) */
#define MBEDTLS_PRINTF_ATTRIBUTE(string_index, first_to_check)
#endif

/**
 * \def MBEDTLS_PRINTF_SIZET
 *
 * MBEDTLS_PRINTF_xxx: Due to issues with older window compilers
 * and MinGW we need to define the printf specifier for size_t
 * and long long per platform.
 *
 * Module:  library/debug.c
 * Caller:
 *
 * This module provides debugging functions.
 */
#if (defined(__MINGW32__) && __USE_MINGW_ANSI_STDIO == 0) || (defined(_MSC_VER) && _MSC_VER < 1800)
   #include <inttypes.h>
   #define MBEDTLS_PRINTF_SIZET     PRIuPTR
   #define MBEDTLS_PRINTF_LONGLONG  "I64d"
#else \
    /* (defined(__MINGW32__)  && __USE_MINGW_ANSI_STDIO == 0) || (defined(_MSC_VER) && _MSC_VER < 1800) */
   #define MBEDTLS_PRINTF_SIZET     "zu"
   #define MBEDTLS_PRINTF_LONGLONG  "lld"
#endif \
    /* (defined(__MINGW32__)  && __USE_MINGW_ANSI_STDIO == 0) || (defined(_MSC_VER) && _MSC_VER < 1800) */

#if !defined(MBEDTLS_PRINTF_MS_TIME)
#define MBEDTLS_PRINTF_MS_TIME PRId64
#endif /* MBEDTLS_PRINTF_MS_TIME */

#ifdef __cplusplus
extern "C" {
#endif

/**
 * \brief   Set the threshold error level to handle globally all debug output.
 *          Debug messages that have a level over the threshold value are
 *          discarded.
 *          (Default value: 0 = No debug )
 *
 * \param threshold     threshold level of messages to filter on. Messages at a
 *                      higher level will be discarded.
 *                          - Debug levels
 *                              - 0 No debug
 *                              - 1 Error
 *                              - 2 State change
 *                              - 3 Informational
 *                              - 4 Verbose
 */
void mbedtls_debug_set_threshold(int threshold);

/**
 * \brief    Print a message to the debug output. This function is always used
 *          through the MBEDTLS_SSL_DEBUG_MSG() macro, which supplies the ssl
 *          context, file and line number parameters.
 *
 * \param ssl       SSL context
 * \param level     error level of the debug message
 * \param file      file the message has occurred in
 * \param line      line number the message has occurred at
 * \param format    format specifier, in printf format
 * \param ...       variables used by the format specifier
 *
 * \attention       This function is intended for INTERNAL usage within the
 *                  library only.
 */
void mbedtls_debug_print_msg(const mbedtls_ssl_context *ssl, int level,
                             const char *file, int line,
                             const char *format, ...) MBEDTLS_PRINTF_ATTRIBUTE(5, 6);

/**
 * \brief   Print the return value of a function to the debug output. This
 *          function is always used through the MBEDTLS_SSL_DEBUG_RET() macro,
 *          which supplies the ssl context, file and line number parameters.
 *
 * \param ssl       SSL context
 * \param level     error level of the debug message
 * \param file      file the error has occurred in
 * \param line      line number the error has occurred in
 * \param text      the name of the function that returned the error
 * \param ret       the return code value
 *
 * \attention       This function is intended for INTERNAL usage within the
 *                  library only.
 */
void mbedtls_debug_print_ret(const mbedtls_ssl_context *ssl, int level,
                             const char *file, int line,
                             const char *text, int ret);

/**
 * \brief   Output a buffer of size len bytes to the debug output. This function
 *          is always used through the MBEDTLS_SSL_DEBUG_BUF() macro,
 *          which supplies the ssl context, file and line number parameters.
 *
 * \param ssl       SSL context
 * \param level     error level of the debug message
 * \param file      file the error has occurred in
 * \param line      line number the error has occurred in
 * \param text      a name or label for the buffer being dumped. Normally the
 *                  variable or buffer name
 * \param buf       the buffer to be outputted
 * \param len       length of the buffer
 *
 * \attention       This function is intended for INTERNAL usage within the
 *                  library only.
 */
void mbedtls_debug_print_buf(const mbedtls_ssl_context *ssl, int level,
                             const char *file, int line, const char *text,
                             const unsigned char *buf, size_t len);

#if defined(MBEDTLS_BIGNUM_C)
/**
 * \brief   Print a MPI variable to the debug output. This function is always
 *          used through the MBEDTLS_SSL_DEBUG_MPI() macro, which supplies the
 *          ssl context, file and line number parameters.
 *
 * \param ssl       SSL context
 * \param level     error level of the debug message
 * \param file      file the error has occurred in
 * \param line      line number the error has occurred in
 * \param text      a name or label for the MPI being output. Normally the
 *                  variable name
 * \param X         the MPI variable
 *
 * \attention       This function is intended for INTERNAL usage within the
 *                  library only.
 */
void mbedtls_debug_print_mpi(const mbedtls_ssl_context *ssl, int level,
                             const char *file, int line,
                             const char *text, const mbedtls_mpi *X);
#endif

#if defined(MBEDTLS_ECP_C)
/**
 * \brief   Print an ECP point to the debug output. This function is always
 *          used through the MBEDTLS_SSL_DEBUG_ECP() macro, which supplies the
 *          ssl context, file and line number parameters.
 *
 * \param ssl       SSL context
 * \param level     error level of the debug message
 * \param file      file the error has occurred in
 * \param line      line number the error has occurred in
 * \param text      a name or label for the ECP point being output. Normally the
 *                  variable name
 * \param X         the ECP point
 *
 * \attention       This function is intended for INTERNAL usage within the
 *                  library only.
 */
void mbedtls_debug_print_ecp(const mbedtls_ssl_context *ssl, int level,
                             const char *file, int line,
                             const char *text, const mbedtls_ecp_point *X);
#endif

#if defined(MBEDTLS_X509_CRT_PARSE_C) && !defined(MBEDTLS_X509_REMOVE_INFO)
/**
 * \brief   Print a X.509 certificate structure to the debug output. This
 *          function is always used through the MBEDTLS_SSL_DEBUG_CRT() macro,
 *          which supplies the ssl context, file and line number parameters.
 *
 * \param ssl       SSL context
 * \param level     error level of the debug message
 * \param file      file the error has occurred in
 * \param line      line number the error has occurred in
 * \param text      a name or label for the certificate being output
 * \param crt       X.509 certificate structure
 *
 * \attention       This function is intended for INTERNAL usage within the
 *                  library only.
 */
void mbedtls_debug_print_crt(const mbedtls_ssl_context *ssl, int level,
                             const char *file, int line,
                             const char *text, const mbedtls_x509_crt *crt);
#endif

/* Note: the MBEDTLS_ECDH_C guard here is mandatory because this debug function
         only works for the built-in implementation. */
#if defined(MBEDTLS_KEY_EXCHANGE_SOME_ECDH_OR_ECDHE_ANY_ENABLED) && \
    defined(MBEDTLS_ECDH_C)
typedef enum {
    MBEDTLS_DEBUG_ECDH_Q,
    MBEDTLS_DEBUG_ECDH_QP,
    MBEDTLS_DEBUG_ECDH_Z,
} mbedtls_debug_ecdh_attr;

/**
 * \brief   Print a field of the ECDH structure in the SSL context to the debug
 *          output. This function is always used through the
 *          MBEDTLS_SSL_DEBUG_ECDH() macro, which supplies the ssl context, file
 *          and line number parameters.
 *
 * \param ssl       SSL context
 * \param level     error level of the debug message
 * \param file      file the error has occurred in
 * \param line      line number the error has occurred in
 * \param ecdh      the ECDH context
 * \param attr      the identifier of the attribute being output
 *
 * \attention       This function is intended for INTERNAL usage within the
 *                  library only.
 */
void mbedtls_debug_printf_ecdh(const mbedtls_ssl_context *ssl, int level,
                               const char *file, int line,
                               const mbedtls_ecdh_context *ecdh,
                               mbedtls_debug_ecdh_attr attr);
#endif /* MBEDTLS_KEY_EXCHANGE_SOME_ECDH_OR_ECDHE_ANY_ENABLED &&
          MBEDTLS_ECDH_C */

#ifdef __cplusplus
}
#endif

#endif /* debug.h */