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925a72628b
mbedtls/library/debug.c
Manuel Pégourié-Gonnard 925a72628b Avoid formatting debug message uselessly
2015-06-29 19:47:17 +02:00

375 lines
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C
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/*
* Debugging routines
*
* Copyright (C) 2006-2014, ARM Limited, All Rights Reserved
*
* This file is part of mbed TLS (https://tls.mbed.org)
*
* 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.
*/
#if !defined(POLARSSL_CONFIG_FILE)
#include "polarssl/config.h"
#else
#include POLARSSL_CONFIG_FILE
#endif
#if defined(POLARSSL_DEBUG_C)
#include "polarssl/debug.h"
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#if defined(_MSC_VER) && !defined(EFIX64) && !defined(EFI32)
#if !defined snprintf
#define snprintf _snprintf
#endif
#if !defined vsnprintf
#define vsnprintf _vsnprintf
#endif
#endif /* _MSC_VER */
#if defined(POLARSSL_PLATFORM_C)
#include "polarssl/platform.h"
#else
#define polarssl_snprintf snprintf
#define polarssl_malloc malloc
#define polarssl_free free
#endif
#define DEBUG_BUF_SIZE 512
static int debug_log_mode = POLARSSL_DEBUG_DFL_MODE;
int debug_threshold = 0;
void debug_set_log_mode( int log_mode )
{
debug_log_mode = log_mode;
}
void debug_set_threshold( int threshold )
{
debug_threshold = threshold;
}
char *debug_fmt( const char *format, ... )
{
va_list argp;
char *str = polarssl_malloc( DEBUG_BUF_SIZE );
if( str == NULL )
return( NULL );
va_start( argp, format );
vsnprintf( str, DEBUG_BUF_SIZE - 1, format, argp );
va_end( argp );
str[DEBUG_BUF_SIZE - 1] = '\0';
return( str );
}
void debug_print_msg_free( const ssl_context *ssl, int level,
const char *file, int line, char *text )
{
if( text != NULL )
debug_print_msg( ssl, level, file, line, text );
polarssl_free( text );
}
void debug_print_msg( const ssl_context *ssl, int level,
const char *file, int line, const char *text )
{
char str[512];
int maxlen = sizeof( str ) - 1;
if( ssl->f_dbg == NULL || level > debug_threshold )
return;
if( debug_log_mode == POLARSSL_DEBUG_LOG_RAW )
{
ssl->f_dbg( ssl->p_dbg, level, text );
return;
}
polarssl_snprintf( str, maxlen, "%s(%04d): %s\n", file, line, text );
str[maxlen] = '\0';
ssl->f_dbg( ssl->p_dbg, level, str );
}
void debug_print_ret( const ssl_context *ssl, int level,
const char *file, int line,
const char *text, int ret )
{
char str[512];
int maxlen = sizeof( str ) - 1;
size_t idx = 0;
if( ssl->f_dbg == NULL || level > debug_threshold )
return;
if( debug_log_mode == POLARSSL_DEBUG_LOG_FULL )
idx = polarssl_snprintf( str, maxlen, "%s(%04d): ", file, line );
polarssl_snprintf( str + idx, maxlen - idx, "%s() returned %d (-0x%04x)\n",
text, ret, -ret );
str[maxlen] = '\0';
ssl->f_dbg( ssl->p_dbg, level, str );
}
void debug_print_buf( const ssl_context *ssl, int level,
const char *file, int line, const char *text,
unsigned char *buf, size_t len )
{
char str[512];
char txt[17];
size_t i, maxlen = sizeof( str ) - 1, idx = 0;
if( ssl->f_dbg == NULL || level > debug_threshold )
return;
if( debug_log_mode == POLARSSL_DEBUG_LOG_FULL )
idx = polarssl_snprintf( str, maxlen, "%s(%04d): ", file, line );
polarssl_snprintf( str + idx, maxlen - idx, "dumping '%s' (%u bytes)\n",
text, (unsigned int) len );
str[maxlen] = '\0';
ssl->f_dbg( ssl->p_dbg, level, 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 )
{
polarssl_snprintf( str + idx, maxlen - idx, " %s\n", txt );
ssl->f_dbg( ssl->p_dbg, level, str );
idx = 0;
memset( txt, 0, sizeof( txt ) );
}
if( debug_log_mode == POLARSSL_DEBUG_LOG_FULL )
idx = polarssl_snprintf( str, maxlen, "%s(%04d): ", file, line );
idx += polarssl_snprintf( str + idx, maxlen - idx, "%04x: ",
(unsigned int) i );
}
idx += polarssl_snprintf( str + idx, maxlen - 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 += polarssl_snprintf( str + idx, maxlen - idx, " " );
polarssl_snprintf( str + idx, maxlen - idx, " %s\n", txt );
ssl->f_dbg( ssl->p_dbg, level, str );
}
}
#if defined(POLARSSL_ECP_C)
void debug_print_ecp( const ssl_context *ssl, int level,
const char *file, int line,
const char *text, const ecp_point *X )
{
char str[512];
int maxlen = sizeof( str ) - 1;
if( ssl->f_dbg == NULL || level > debug_threshold )
return;
polarssl_snprintf( str, maxlen, "%s(X)", text );
str[maxlen] = '\0';
debug_print_mpi( ssl, level, file, line, str, &X->X );
polarssl_snprintf( str, maxlen, "%s(Y)", text );
str[maxlen] = '\0';
debug_print_mpi( ssl, level, file, line, str, &X->Y );
}
#endif /* POLARSSL_ECP_C */
#if defined(POLARSSL_BIGNUM_C)
void debug_print_mpi( const ssl_context *ssl, int level,
const char *file, int line,
const char *text, const mpi *X )
{
char str[512];
int j, k, maxlen = sizeof( str ) - 1, zeros = 1;
size_t i, n, idx = 0;
if( ssl->f_dbg == NULL || X == NULL || level > debug_threshold )
return;
for( n = X->n - 1; n > 0; n-- )
if( X->p[n] != 0 )
break;
for( j = ( sizeof(t_uint) << 3 ) - 1; j >= 0; j-- )
if( ( ( X->p[n] >> j ) & 1 ) != 0 )
break;
if( debug_log_mode == POLARSSL_DEBUG_LOG_FULL )
idx = polarssl_snprintf( str, maxlen, "%s(%04d): ", file, line );
polarssl_snprintf( str + idx, maxlen - idx, "value of '%s' (%d bits) is:\n",
text, (int) ( ( n * ( sizeof(t_uint) << 3 ) ) + j + 1 ) );
str[maxlen] = '\0';
ssl->f_dbg( ssl->p_dbg, level, str );
idx = 0;
for( i = n + 1, j = 0; i > 0; i-- )
{
if( zeros && X->p[i - 1] == 0 )
continue;
for( k = sizeof( t_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 )
{
polarssl_snprintf( str + idx, maxlen - idx, "\n" );
ssl->f_dbg( ssl->p_dbg, level, str );
idx = 0;
}
if( debug_log_mode == POLARSSL_DEBUG_LOG_FULL )
idx = polarssl_snprintf( str, maxlen, "%s(%04d): ", file, line );
}
idx += polarssl_snprintf( str + idx, maxlen - idx, " %02x", (unsigned int)
( X->p[i - 1] >> ( k << 3 ) ) & 0xFF );
j++;
}
}
if( zeros == 1 )
{
if( debug_log_mode == POLARSSL_DEBUG_LOG_FULL )
{
idx = polarssl_snprintf( str, maxlen, "%s(%04d): ", file, line );
}
idx += polarssl_snprintf( str + idx, maxlen - idx, " 00" );
}
polarssl_snprintf( str + idx, maxlen - idx, "\n" );
ssl->f_dbg( ssl->p_dbg, level, str );
}
#endif /* POLARSSL_BIGNUM_C */
#if defined(POLARSSL_X509_CRT_PARSE_C)
static void debug_print_pk( const ssl_context *ssl, int level,
const char *file, int line,
const char *text, const pk_context *pk )
{
size_t i;
pk_debug_item items[POLARSSL_PK_DEBUG_MAX_ITEMS];
char name[16];
memset( items, 0, sizeof( items ) );
if( pk_debug( pk, items ) != 0 )
{
debug_print_msg( ssl, level, file, line, "invalid PK context" );
return;
}
for( i = 0; i < POLARSSL_PK_DEBUG_MAX_ITEMS; i++ )
{
if( items[i].type == POLARSSL_PK_DEBUG_NONE )
return;
polarssl_snprintf( name, sizeof( name ), "%s%s", text, items[i].name );
name[sizeof( name ) - 1] = '\0';
if( items[i].type == POLARSSL_PK_DEBUG_MPI )
debug_print_mpi( ssl, level, file, line, name, items[i].value );
else
#if defined(POLARSSL_ECP_C)
if( items[i].type == POLARSSL_PK_DEBUG_ECP )
debug_print_ecp( ssl, level, file, line, name, items[i].value );
else
#endif
debug_print_msg( ssl, level, file, line, "should not happen" );
}
}
void debug_print_crt( const ssl_context *ssl, int level,
const char *file, int line,
const char *text, const x509_crt *crt )
{
char str[1024], prefix[64];
int i = 0, maxlen = sizeof( prefix ) - 1, idx = 0;
if( ssl->f_dbg == NULL || crt == NULL || level > debug_threshold )
return;
if( debug_log_mode == POLARSSL_DEBUG_LOG_FULL )
{
polarssl_snprintf( prefix, maxlen, "%s(%04d): ", file, line );
prefix[maxlen] = '\0';
}
else
prefix[0] = '\0';
maxlen = sizeof( str ) - 1;
while( crt != NULL )
{
char buf[1024];
x509_crt_info( buf, sizeof( buf ) - 1, prefix, crt );
if( debug_log_mode == POLARSSL_DEBUG_LOG_FULL )
idx = polarssl_snprintf( str, maxlen, "%s(%04d): ", file, line );
polarssl_snprintf( str + idx, maxlen - idx, "%s #%d:\n%s",
text, ++i, buf );
str[maxlen] = '\0';
ssl->f_dbg( ssl->p_dbg, level, str );
debug_print_pk( ssl, level, file, line, "crt->", &crt->pk );
crt = crt->next;
}
}
#endif /* POLARSSL_X509_CRT_PARSE_C */
#endif /* POLARSSL_DEBUG_C */
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