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/* asn1Decoding.c --- program to generate an ASN1 type from a DER coding.
* Copyright (C) 2002-2014 Free Software Foundation, Inc.
*
* This file is part of LIBTASN1.
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*
*/
#include <config.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <getopt.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <libtasn1.h>
#include "benchmark.h"
#define program_name "asn1Decoding"
static int decode (asn1_node definitions, const char *typeName, void *der,
int der_len, int benchmark, int strict);
/* This feature is available in gcc versions 2.5 and later. */
#if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 5)
#define ATTR_NO_RETRUN
#else
#define ATTR_NO_RETRUN __attribute__ ((__noreturn__))
#endif
ATTR_NO_RETRUN static void
usage (int status)
{
if (status != EXIT_SUCCESS)
fprintf (stderr, "Try `%s --help' for more information.\n", program_name);
else
{
printf ("\
Usage: %s [OPTION] DEFINITIONS ENCODED ASN1TYPE\n", program_name);
printf ("\
Decodes DER data in ENCODED file, for the ASN1TYPE element\n\
described in ASN.1 DEFINITIONS file, and print decoded structures.\n\
\n");
printf ("\
-b, --benchmark perform a benchmark on decoding\n\
-s, --strict use strict DER decoding\n\
-t, --no-time-strict use strict DER decoding but not in time fields\n\
-h, --help display this help and exit\n\
-v, --version output version information and exit\n");
printf ("Report bugs to "PACKAGE_BUGREPORT);
}
exit (status);
}
static char *read_binary_file(const char *file, size_t *l)
{
FILE *fp;
struct stat st;
char *out;
if (stat(file, &st) == -1)
{
fprintf(stderr, "Error reading file size!\n");
exit(1);
}
fp = fopen(file, "rb");
if (fp == NULL)
{
fprintf(stderr, "Error reading file!\n");
exit(1);
}
out = malloc(st.st_size+1);
if (out == NULL)
{
fprintf(stderr, "Memory error!\n");
exit(1);
}
*l = fread(out, 1, st.st_size, fp);
if ((off_t)*l != st.st_size)
{
fprintf(stderr, "Error reading contents (got: %ld, expected %ld)!\n",
(long)*l, (long)st.st_size);
exit(1);
}
out[*l] = 0;
fclose(fp);
return out;
}
int
main (int argc, char *argv[])
{
static const struct option long_options[] = {
{"help", no_argument, 0, 'h'},
{"strict", no_argument, 0, 's'},
{"no-time-strict", no_argument, 0, 't'},
{"debug", no_argument, 0, 'd'},
{"benchmark", no_argument, 0, 'b'},
{"version", no_argument, 0, 'v'},
{0, 0, 0, 0}
};
int option_index = 0;
int option_result;
char *inputFileAsnName = NULL;
char *inputFileDerName = NULL;
char *typeName = NULL;
asn1_node definitions = NULL;
char errorDescription[ASN1_MAX_ERROR_DESCRIPTION_SIZE];
int asn1_result = ASN1_SUCCESS;
unsigned char *der;
int der_len = 0, benchmark = 0;
int flags = 0, debug = 0;
/* FILE *outputFile; */
opterr = 0; /* disable error messages from getopt */
while (1)
{
option_result =
getopt_long (argc, argv, "hbdsvtc", long_options, &option_index);
if (option_result == -1)
break;
switch (option_result)
{
case 'h': /* HELP */
usage (EXIT_SUCCESS);
break;
case 'b':
benchmark = 1;
break;
case 'd':
debug = 1;
break;
case 's':
case 't':
flags |= ASN1_DECODE_FLAG_STRICT_DER;
if (option_result == 't')
flags |= ASN1_DECODE_FLAG_ALLOW_INCORRECT_TIME;
break;
case 'v': /* VERSION */
printf(program_name" "PACKAGE" " VERSION"\n");
printf("Copyright (C) 2017-2019 Free Software Foundation, Inc.\n\n");
printf("Written by Fabio Fiorina\n");
exit (0);
break;
case '?': /* UNKNOW OPTION */
fprintf (stderr,
"asn1Decoding: option '%s' not recognized or without argument.\n\n",
argv[optind - 1]);
usage (EXIT_FAILURE);
break;
default:
fprintf (stderr,
"asn1Decoding: ?? getopt returned character code Ox%x ??\n",
(unsigned)option_result);
}
}
if (optind == argc || optind == argc - 1 || optind == argc - 2)
{
fprintf (stderr, "asn1Decoding: input files or ASN.1 type "
"name missing\n");
usage (EXIT_FAILURE);
}
inputFileAsnName = strdup(argv[optind]);
inputFileDerName = strdup(argv[optind + 1]);
typeName = strdup(argv[optind + 2]);
if (!(inputFileAsnName && inputFileDerName && typeName))
{
fprintf(stderr, "allocation failed\n");
free(inputFileAsnName);
free(inputFileDerName);
free(typeName);
exit(1);
}
asn1_result =
asn1_parser2tree (inputFileAsnName, &definitions, errorDescription);
switch (asn1_result)
{
case ASN1_SUCCESS:
fprintf (stderr, "Parse: done.\n");
break;
case ASN1_FILE_NOT_FOUND:
fprintf (stderr, "asn1Decoding: FILE %s NOT FOUND\n", inputFileAsnName);
break;
case ASN1_SYNTAX_ERROR:
case ASN1_IDENTIFIER_NOT_FOUND:
case ASN1_NAME_TOO_LONG:
fprintf (stderr, "asn1Decoding: %s\n", errorDescription);
break;
default:
fprintf (stderr, "libtasn1 ERROR: %s\n", asn1_strerror (asn1_result));
}
if (asn1_result != ASN1_SUCCESS)
{
free (inputFileAsnName);
free (inputFileDerName);
free (typeName);
exit (1);
}
{
size_t tmplen;
der = (unsigned char *) read_binary_file (inputFileDerName, &tmplen);
der_len = tmplen;
}
/* read_binary_file() returns a buffer with more data than required,
* with this reallocation we ensure that memory accesses outside the
* boundaries are detected */
if (der != NULL && debug != 0)
der = realloc(der, der_len);
if (der == NULL)
{
fprintf (stderr, "asn1Decoding: could not read '%s'\n",
inputFileDerName);
asn1_delete_structure (&definitions);
free (inputFileAsnName);
free (inputFileDerName);
free (typeName);
exit (1);
}
/*****************************************/
/* ONLY FOR TEST */
/*****************************************/
/*
der_len=0;
outputFile=fopen("data.p12","w");
while(fscanf(inputFile,"%c",der+der_len) != EOF)
{
if((der_len>=0x11) && (der_len<=(0xe70)))
fprintf(outputFile,"%c",der[der_len]);
der_len++;
}
fclose(outputFile);
fclose(inputFile);
*/
if (decode (definitions, typeName, der, der_len, benchmark, flags) != ASN1_SUCCESS)
{
asn1_delete_structure (&definitions);
free (inputFileAsnName);
free (inputFileDerName);
free (typeName);
free (der);
exit (1);
}
asn1_delete_structure (&definitions);
free (der);
free (inputFileAsnName);
free (inputFileDerName);
free (typeName);
if (asn1_result != ASN1_SUCCESS)
exit (1);
exit (0);
}
static int
simple_decode (asn1_node definitions, const char *typeName, void *der,
int der_len, int benchmark, int flags)
{
int asn1_result;
asn1_node structure = NULL;
char errorDescription[ASN1_MAX_ERROR_DESCRIPTION_SIZE];
asn1_result = asn1_create_element (definitions, typeName, &structure);
/* asn1_print_structure(stdout,structure,"",ASN1_PRINT_ALL); */
if (asn1_result != ASN1_SUCCESS)
{
fprintf (stderr, "Structure creation: %s\n",
asn1_strerror (asn1_result));
asn1_delete_structure (&structure);
return asn1_result;
}
if (flags != 0)
asn1_result =
asn1_der_decoding2(&structure, der, &der_len, flags, errorDescription);
else
asn1_result =
asn1_der_decoding (&structure, der, der_len, errorDescription);
if (!benchmark)
fprintf (stderr, "\nDecoding: %s\n", asn1_strerror (asn1_result));
if (asn1_result != ASN1_SUCCESS)
{
fprintf (stderr, "asn1Decoding: %s\n", errorDescription);
asn1_delete_structure (&structure);
return asn1_result;
}
if (!benchmark)
{
fprintf (stderr, "\nDECODING RESULT:\n");
asn1_print_structure (stdout, structure, "",
ASN1_PRINT_NAME_TYPE_VALUE);
}
asn1_delete_structure (&structure);
return ASN1_SUCCESS;
}
static int
decode (asn1_node definitions, const char *typeName, void *der, int der_len,
int benchmark, int flags)
{
struct benchmark_st st;
if (benchmark == 0)
return simple_decode (definitions, typeName, der, der_len, benchmark, flags);
else
{
start_benchmark (&st);
do
{
simple_decode (definitions, typeName, der, der_len, benchmark, flags);
st.size++;
}
while (benchmark_must_finish == 0);
stop_benchmark (&st, "structures");
fprintf (stdout, "\n");
}
return ASN1_SUCCESS;
}
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