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/*

 *  Debugging routines

 *

 *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved

 *  SPDX-License-Identifier: GPL-2.0

 *

 *  This program is free software; you can redistribute it and/or modify

 *  it under the terms of the GNU General Public License as published by

 *  the Free Software Foundation; either version 2 of the License, or

 *  (at your option) any later version.

 *

 *  This program is distributed in the hope that it will be useful,

 *  but WITHOUT ANY WARRANTY; without even the implied warranty of

 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 *  GNU General Public License for more details.

 *

 *  You should have received a copy of the GNU General Public License along

 *  with this program; if not, write to the Free Software Foundation, Inc.,

 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 *  This file is part of mbed TLS (https://tls.mbed.org)

 */

#if !defined(MBEDTLS_CONFIG_FILE)

#include "mbedtls/config.h"

#else

#include MBEDTLS_CONFIG_FILE

#endif

#if defined(MBEDTLS_DEBUG_C)

#if defined(MBEDTLS_PLATFORM_C)

#include "mbedtls/platform.h"

#else

#include 

#define mbedtls_calloc      calloc

#define mbedtls_free        free

#define mbedtls_time_t      time_t

#define mbedtls_snprintf    snprintf

#endif

#include "mbedtls/debug.h"

#include 

#include 

#include 

#if ( defined(__ARMCC_VERSION) || defined(_MSC_VER) ) && \

    !defined(inline) && !defined(__cplusplus)

#define inline __inline

#endif

#define DEBUG_BUF_SIZE      512

static int debug_threshold = 0;

void mbedtls_debug_set_threshold( int threshold )

{

    debug_threshold = threshold;

}

/*

 * All calls to f_dbg must be made via this function

 */

static inline void debug_send_line( const mbedtls_ssl_context *ssl, int level,

                                    const char *file, int line,

                                    const char *str )

{

    /*

     * If in a threaded environment, we need a thread identifier.

     * Since there is no portable way to get one, use the address of the ssl

     * context instead, as it shouldn't be shared between threads.

     */

#if defined(MBEDTLS_THREADING_C)

    char idstr[20 + DEBUG_BUF_SIZE]; /* 0x + 16 nibbles + ': ' */

    mbedtls_snprintf( idstr, sizeof( idstr ), "%p: %s", (void*)ssl, str );

    ssl->conf->f_dbg( ssl->conf->p_dbg, level, file, line, idstr );

#else

    ssl->conf->f_dbg( ssl->conf->p_dbg, level, file, line, str );

#endif

}

void mbedtls_debug_print_msg( const mbedtls_ssl_context *ssl, int level,

                              const char *file, int line,

                              const char *format, ... )

{

    va_list argp;

    char str[DEBUG_BUF_SIZE];

    int ret;

    if( NULL == ssl              ||

        NULL == ssl->conf        ||

        NULL == ssl->conf->f_dbg ||

        level > debug_threshold )

    {

        return;

    }

    va_start( argp, format );

#if defined(_WIN32)

#if defined(_TRUNCATE) && !defined(__MINGW32__)

    ret = _vsnprintf_s( str, DEBUG_BUF_SIZE, _TRUNCATE, format, argp );

#else

    ret = _vsnprintf( str, DEBUG_BUF_SIZE, format, argp );

    if( ret < 0 || (size_t) ret == DEBUG_BUF_SIZE )

    {

        str[DEBUG_BUF_SIZE-1] = '\0';

        ret = -1;

    }

#endif

#else

    ret = vsnprintf( str, DEBUG_BUF_SIZE, format, argp );

#endif

    va_end( argp );

    if( ret >= 0 && ret < DEBUG_BUF_SIZE - 1 )

    {

        str[ret]     = '\n';

        str[ret + 1] = '\0';

    }

    debug_send_line( ssl, level, file, line, str );

}

void mbedtls_debug_print_ret( const mbedtls_ssl_context *ssl, int level,

                      const char *file, int line,

                      const char *text, int ret )

{

    char str[DEBUG_BUF_SIZE];

    if( NULL == ssl              ||

        NULL == ssl->conf        ||

        NULL == ssl->conf->f_dbg ||

        level > debug_threshold )

    {

        return;

    }

    /*

     * With non-blocking I/O and examples that just retry immediately,

     * the logs would be quickly flooded with WANT_READ, so ignore that.

     * Don't ignore WANT_WRITE however, since is is usually rare.

     */

    if( ret == MBEDTLS_ERR_SSL_WANT_READ )

        return;

    mbedtls_snprintf( str, sizeof( str ), "%s() returned %d (-0x%04x)\n",

              text, ret, -ret );

    debug_send_line( ssl, level, file, line, str );

}

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 )

{

    char str[DEBUG_BUF_SIZE];

    char txt[17];

    size_t i, idx = 0;

    if( NULL == ssl              ||

        NULL == ssl->conf        ||

        NULL == ssl->conf->f_dbg ||

        level > debug_threshold )

    {

        return;

    }

    mbedtls_snprintf( str + idx, sizeof( str ) - idx, "dumping '%s' (%u bytes)\n",

              text, (unsigned int) len );

    debug_send_line( ssl, level, file, line, str );

    idx = 0;

    memset( txt, 0, sizeof( txt ) );

    for( i = 0; i < len; i++ )

    {

        if( i >= 4096 )

            break;

        if( i % 16 == 0 )

        {

            if( i > 0 )

            {

                mbedtls_snprintf( str + idx, sizeof( str ) - idx, "  %s\n", txt );

                debug_send_line( ssl, level, file, line, str );

                idx = 0;

                memset( txt, 0, sizeof( txt ) );

            }

            idx += mbedtls_snprintf( str + idx, sizeof( str ) - idx, "%04x: ",

                             (unsigned int) i );

        }

        idx += mbedtls_snprintf( str + idx, sizeof( str ) - idx, " %02x",

                         (unsigned int) buf[i] );

        txt[i % 16] = ( buf[i] > 31 && buf[i] < 127 ) ? buf[i] : '.' ;

    }

    if( len > 0 )

    {

        for( /* i = i */; i % 16 != 0; i++ )

            idx += mbedtls_snprintf( str + idx, sizeof( str ) - idx, "   " );

        mbedtls_snprintf( str + idx, sizeof( str ) - idx, "  %s\n", txt );

        debug_send_line( ssl, level, file, line, str );

    }

}

#if defined(MBEDTLS_ECP_C)

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 )

{

    char str[DEBUG_BUF_SIZE];

    if( NULL == ssl              ||

        NULL == ssl->conf        ||

        NULL == ssl->conf->f_dbg ||

        level > debug_threshold )

    {

        return;

    }

    mbedtls_snprintf( str, sizeof( str ), "%s(X)", text );

    mbedtls_debug_print_mpi( ssl, level, file, line, str, &X->X );

    mbedtls_snprintf( str, sizeof( str ), "%s(Y)", text );

    mbedtls_debug_print_mpi( ssl, level, file, line, str, &X->Y );

}

#endif /* MBEDTLS_ECP_C */

#if defined(MBEDTLS_BIGNUM_C)

void mbedtls_debug_print_mpi( const mbedtls_ssl_context *ssl, int level,

                      const char *file, int line,

                      const char *text, const mbedtls_mpi *X )

{

    char str[DEBUG_BUF_SIZE];

    int j, k, zeros = 1;

    size_t i, n, idx = 0;

    if( NULL == ssl              ||

        NULL == ssl->conf        ||

        NULL == ssl->conf->f_dbg ||

        NULL == X                ||

        level > debug_threshold )

    {

        return;

    }

    for( n = X->n - 1; n > 0; n-- )

        if( X->p[n] != 0 )

            break;

    for( j = ( sizeof(mbedtls_mpi_uint) << 3 ) - 1; j >= 0; j-- )

        if( ( ( X->p[n] >> j ) & 1 ) != 0 )

            break;

    mbedtls_snprintf( str + idx, sizeof( str ) - idx, "value of '%s' (%d bits) is:\n",

              text, (int) ( ( n * ( sizeof(mbedtls_mpi_uint) << 3 ) ) + j + 1 ) );

    debug_send_line( ssl, level, file, line, str );

    idx = 0;

    for( i = n + 1, j = 0; i > 0; i-- )

    {

        if( zeros && X->p[i - 1] == 0 )

            continue;

        for( k = sizeof( mbedtls_mpi_uint ) - 1; k >= 0; k-- )

        {

            if( zeros && ( ( X->p[i - 1] >> ( k << 3 ) ) & 0xFF ) == 0 )

                continue;

            else

                zeros = 0;

            if( j % 16 == 0 )

            {

                if( j > 0 )

                {

                    mbedtls_snprintf( str + idx, sizeof( str ) - idx, "\n" );

                    debug_send_line( ssl, level, file, line, str );

                    idx = 0;

                }

            }

            idx += mbedtls_snprintf( str + idx, sizeof( str ) - idx, " %02x", (unsigned int)

                             ( X->p[i - 1] >> ( k << 3 ) ) & 0xFF );

            j++;

        }

    }

    if( zeros == 1 )

        idx += mbedtls_snprintf( str + idx, sizeof( str ) - idx, " 00" );

    mbedtls_snprintf( str + idx, sizeof( str ) - idx, "\n" );

    debug_send_line( ssl, level, file, line, str );

}

#endif /* MBEDTLS_BIGNUM_C */

#if defined(MBEDTLS_X509_CRT_PARSE_C)

static void debug_print_pk( const mbedtls_ssl_context *ssl, int level,

                            const char *file, int line,

                            const char *text, const mbedtls_pk_context *pk )

{

    size_t i;

    mbedtls_pk_debug_item items[MBEDTLS_PK_DEBUG_MAX_ITEMS];

    char name[16];

    memset( items, 0, sizeof( items ) );

    if( mbedtls_pk_debug( pk, items ) != 0 )

    {

        debug_send_line( ssl, level, file, line,

                          "invalid PK context\n" );

        return;

    }

    for( i = 0; i < MBEDTLS_PK_DEBUG_MAX_ITEMS; i++ )

    {

        if( items[i].type == MBEDTLS_PK_DEBUG_NONE )

            return;

        mbedtls_snprintf( name, sizeof( name ), "%s%s", text, items[i].name );

        name[sizeof( name ) - 1] = '\0';

        if( items[i].type == MBEDTLS_PK_DEBUG_MPI )

            mbedtls_debug_print_mpi( ssl, level, file, line, name, items[i].value );

        else

#if defined(MBEDTLS_ECP_C)

        if( items[i].type == MBEDTLS_PK_DEBUG_ECP )

            mbedtls_debug_print_ecp( ssl, level, file, line, name, items[i].value );

        else

#endif

            debug_send_line( ssl, level, file, line,

                              "should not happen\n" );

    }

}

static void debug_print_line_by_line( const mbedtls_ssl_context *ssl, int level,

                                      const char *file, int line, const char *text )

{

    char str[DEBUG_BUF_SIZE];

    const char *start, *cur;

    start = text;

    for( cur = text; *cur != '\0'; cur++ )

    {

        if( *cur == '\n' )

        {

            size_t len = cur - start + 1;

            if( len > DEBUG_BUF_SIZE - 1 )

                len = DEBUG_BUF_SIZE - 1;

            memcpy( str, start, len );

            str[len] = '\0';

            debug_send_line( ssl, level, file, line, str );

            start = cur + 1;

        }

    }

}

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 )

{

    char str[DEBUG_BUF_SIZE];

    int i = 0;

    if( NULL == ssl              ||

        NULL == ssl->conf        ||

        NULL == ssl->conf->f_dbg ||

        NULL == crt              ||

        level > debug_threshold )

    {

        return;

    }

    while( crt != NULL )

    {

        char buf[1024];

        mbedtls_snprintf( str, sizeof( str ), "%s #%d:\n", text, ++i );

        debug_send_line( ssl, level, file, line, str );

        mbedtls_x509_crt_info( buf, sizeof( buf ) - 1, "", crt );

        debug_print_line_by_line( ssl, level, file, line, buf );

        debug_print_pk( ssl, level, file, line, "crt->", &crt->pk );

        crt = crt->next;

    }

}

#endif /* MBEDTLS_X509_CRT_PARSE_C */

#if defined(MBEDTLS_ECDH_C)

static void mbedtls_debug_printf_ecdh_internal( const mbedtls_ssl_context *ssl,

                                                int level, const char *file,

                                                int line,

                                                const mbedtls_ecdh_context *ecdh,

                                                mbedtls_debug_ecdh_attr attr )

{

#if defined(MBEDTLS_ECDH_LEGACY_CONTEXT)

    const mbedtls_ecdh_context* ctx = ecdh;

#else

    const mbedtls_ecdh_context_mbed* ctx = &ecdh->ctx.mbed_ecdh;

#endif

    switch( attr )

    {

        case MBEDTLS_DEBUG_ECDH_Q:

            mbedtls_debug_print_ecp( ssl, level, file, line, "ECDH: Q",

                                     &ctx->Q );

            break;

        case MBEDTLS_DEBUG_ECDH_QP:

            mbedtls_debug_print_ecp( ssl, level, file, line, "ECDH: Qp",

                                     &ctx->Qp );

            break;

        case MBEDTLS_DEBUG_ECDH_Z:

            mbedtls_debug_print_mpi( ssl, level, file, line, "ECDH: z",

                                     &ctx->z );

            break;

        default:

            break;

    }

}

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 )

{

#if defined(MBEDTLS_ECDH_LEGACY_CONTEXT)

    mbedtls_debug_printf_ecdh_internal( ssl, level, file, line, ecdh, attr );

#else

    switch( ecdh->var )

    {

        default:

            mbedtls_debug_printf_ecdh_internal( ssl, level, file, line, ecdh,

                                                attr );

    }

#endif

}

#endif /* MBEDTLS_ECDH_C */

#endif /* MBEDTLS_DEBUG_C */