2020-03-13 13:43:22 +00:00
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/*
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* MbedTLS SSL context deserializer from base64 code
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*
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* Copyright (C) 2006-2020, ARM Limited, All Rights Reserved
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* This file is part of mbed TLS (https://tls.mbed.org)
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*/
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2020-03-13 15:26:08 +00:00
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#include <stdio.h>
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#include <stdlib.h>
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2020-03-16 13:05:22 +00:00
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#include <stdint.h>
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2020-03-13 15:26:08 +00:00
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#include <stdarg.h>
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#include <string.h>
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/*
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* This program version
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*/
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#define PROG_NAME "ssl_base64_dump"
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#define VER_MAJOR 0
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#define VER_MINOR 1
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/*
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* Global values
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*/
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FILE *b64_file = NULL; /* file with base64 codes to deserialize */
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char debug = 0; /* flag for debug messages */
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/*
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* Basic printing functions
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*/
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void print_version( )
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{
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printf( "%s v%d.%d\n", PROG_NAME, VER_MAJOR, VER_MINOR );
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}
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void print_usage( )
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{
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print_version();
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printf(
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"Usage:\n"
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"\t-f path - Path to the file with base64 code\n"
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"\t-v - Show version\n"
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"\t-h - Show this usage\n"
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"\t-d - Print more information\n"
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"\n"
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);
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}
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void printf_dbg( const char *str, ... )
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{
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if( debug )
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{
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va_list args;
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va_start( args, str );
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printf( "debug: " );
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vprintf( str, args );
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fflush( stdout );
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va_end( args );
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}
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}
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void printf_err( const char *str, ... )
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{
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va_list args;
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va_start( args, str );
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fprintf( stderr, "ERROR: " );
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vfprintf( stderr, str, args );
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fflush( stderr );
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va_end( args );
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}
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/*
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* Exit from the program in case of error
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*/
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void error_exit()
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{
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if( NULL != b64_file )
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{
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fclose( b64_file );
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}
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exit( -1 );
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}
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/*
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* This function takes the input arguments of this program
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*/
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void parse_arguments( int argc, char *argv[] )
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{
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int i = 1;
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if( argc < 2 )
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{
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print_usage();
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error_exit();
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}
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while( i < argc )
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{
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if( strcmp( argv[i], "-d" ) == 0 )
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{
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debug = 1;
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}
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else if( strcmp( argv[i], "-h" ) == 0 )
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{
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print_usage();
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}
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else if( strcmp( argv[i], "-v" ) == 0 )
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{
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print_version();
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}
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else if( strcmp( argv[i], "-f" ) == 0 )
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{
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if( ++i >= argc )
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{
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printf_err( "File path is empty\n" );
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error_exit();
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}
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if( ( b64_file = fopen( argv[i], "r" ) ) == NULL )
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{
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printf_err( "Cannot find file \"%s\"\n", argv[i] );
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error_exit();
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}
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}
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else
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{
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print_usage();
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error_exit();
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}
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i++;
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}
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}
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2020-03-16 13:05:22 +00:00
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/*
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* Read next base64 code from the 'b64_file'. The 'b64_file' must be opened
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* previously. After each call to this function, the internal file position
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* indicator of the global b64_file is advanced.
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*
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* /p b64 buffer for input data
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* /p max_len the maximum number of bytes to write
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*
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* \retval number of bytes written in to the b64 buffer or 0 in case no more
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* data was found
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*/
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size_t read_next_b64_code( char *b64, const size_t max_len )
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{
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size_t len = 0;
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uint32_t missed = 0;
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char pad = 0;
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char c = 0;
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while( EOF != c )
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{
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char c_valid = 0;
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c = (char) fgetc( b64_file );
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if( pad == 1 )
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{
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if( c == '=' )
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{
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c_valid = 1;
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pad = 2;
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}
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}
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else if( ( c >= 'A' && c <= 'Z' ) ||
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( c >= 'a' && c <= 'z' ) ||
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( c >= '0' && c <= '9' ) ||
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c == '+' || c == '/' )
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{
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c_valid = 1;
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}
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else if( c == '=' )
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{
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c_valid = 1;
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pad = 1;
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}
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else if( c == '-' )
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{
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c = '+';
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c_valid = 1;
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}
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else if( c == '_' )
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{
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c = '/';
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c_valid = 1;
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}
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if( c_valid )
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{
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if( len < max_len )
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{
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b64[ len++ ] = c;
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}
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else
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{
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missed++;
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}
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}
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else if( len > 0 )
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{
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if( missed > 0 )
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{
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printf_err( "Buffer for the base64 code is too small. Missed %u characters\n", missed );
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}
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return len;
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}
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}
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printf_dbg( "End of file\n" );
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return 0;
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}
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2020-03-13 13:43:22 +00:00
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int main( int argc, char *argv[] )
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{
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2020-03-16 13:05:22 +00:00
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enum { B64BUF_LEN = 4 * 1024 };
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char b64[ B64BUF_LEN ];
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2020-03-13 15:26:08 +00:00
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parse_arguments( argc, argv );
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2020-03-13 13:43:22 +00:00
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2020-03-16 13:05:22 +00:00
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while( NULL != b64_file )
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{
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size_t len = read_next_b64_code( b64, B64BUF_LEN );
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if( len > 0)
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{
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/* TODO: deserializing */
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}
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else
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{
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fclose( b64_file );
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b64_file = NULL;
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}
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}
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2020-03-13 13:43:22 +00:00
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return 0;
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}
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