/* apps/asn1pars.c */

/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)

 * All rights reserved.

 *

 * This package is an SSL implementation written

 * by Eric Young (eay@cryptsoft.com).

 * The implementation was written so as to conform with Netscapes SSL.

 * 

 * This library is free for commercial and non-commercial use as long as

 * the following conditions are aheared to.  The following conditions

 * apply to all code found in this distribution, be it the RC4, RSA,

 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation

 * included with this distribution is covered by the same copyright terms

 * except that the holder is Tim Hudson (tjh@cryptsoft.com).

 * 

 * Copyright remains Eric Young's, and as such any Copyright notices in

 * the code are not to be removed.

 * If this package is used in a product, Eric Young should be given attribution

 * as the author of the parts of the library used.

 * This can be in the form of a textual message at program startup or

 * in documentation (online or textual) provided with the package.

 * 

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. All advertising materials mentioning features or use of this software

 *    must display the following acknowledgement:

 *    "This product includes cryptographic software written by

 *     Eric Young (eay@cryptsoft.com)"

 *    The word 'cryptographic' can be left out if the rouines from the library

 *    being used are not cryptographic related :-).

 * 4. If you include any Windows specific code (or a derivative thereof) from 

 *    the apps directory (application code) you must include an acknowledgement:

 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"

 * 

 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 * 

 * The licence and distribution terms for any publically available version or

 * derivative of this code cannot be changed.  i.e. this code cannot simply be

 * copied and put under another distribution licence

 * [including the GNU Public Licence.]

 */

/* A nice addition from Dr Stephen Henson <shenson@bigfoot.com> to 

 * add the -strparse option which parses nested binary structures

 */

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include "apps.h"

#include <openssl/err.h>

#include <openssl/evp.h>

#include <openssl/x509.h>

#include <openssl/pem.h>

/* -inform arg	- input format - default PEM (DER or PEM)

 * -in arg	- input file - default stdin

 * -i		- indent the details by depth

 * -offset	- where in the file to start

 * -length	- how many bytes to use

 * -oid file	- extra oid description file

 */

#undef PROG

#define PROG	asn1parse_main

int MAIN(int, char **);

static int do_generate(BIO *bio, char *genstr, char *genconf, BUF_MEM *buf);

int MAIN(int argc, char **argv)

	{

	int i,badops=0,offset=0,ret=1,j;

	unsigned int length=0;

	long num,tmplen;

	BIO *in=NULL,*out=NULL,*b64=NULL, *derout = NULL;

	int informat,indent=0, noout = 0, dump = 0;

	char *infile=NULL,*str=NULL,*prog,*oidfile=NULL, *derfile=NULL;

	char *genstr=NULL, *genconf=NULL;

	unsigned char *tmpbuf;

	const unsigned char *ctmpbuf;

	BUF_MEM *buf=NULL;

	STACK *osk=NULL;

	ASN1_TYPE *at=NULL;

	informat=FORMAT_PEM;

	apps_startup();

	if (bio_err == NULL)

		if ((bio_err=BIO_new(BIO_s_file())) != NULL)

			BIO_set_fp(bio_err,stderr,BIO_NOCLOSE|BIO_FP_TEXT);

	if (!load_config(bio_err, NULL))

		goto end;

	prog=argv[0];

	argc--;

	argv++;

	if ((osk=sk_new_null()) == NULL)

		{

		BIO_printf(bio_err,"Memory allocation failure\n");

		goto end;

		}

	while (argc >= 1)

		{

		if 	(strcmp(*argv,"-inform") == 0)

			{

			if (--argc < 1) goto bad;

			informat=str2fmt(*(++argv));

			}

		else if (strcmp(*argv,"-in") == 0)

			{

			if (--argc < 1) goto bad;

			infile= *(++argv);

			}

		else if (strcmp(*argv,"-out") == 0)

			{

			if (--argc < 1) goto bad;

			derfile= *(++argv);

			}

		else if (strcmp(*argv,"-i") == 0)

			{

			indent=1;

			}

		else if (strcmp(*argv,"-noout") == 0) noout = 1;

		else if (strcmp(*argv,"-oid") == 0)

			{

			if (--argc < 1) goto bad;

			oidfile= *(++argv);

			}

		else if (strcmp(*argv,"-offset") == 0)

			{

			if (--argc < 1) goto bad;

			offset= atoi(*(++argv));

			}

		else if (strcmp(*argv,"-length") == 0)

			{

			if (--argc < 1) goto bad;

			length= atoi(*(++argv));

			if (length == 0) goto bad;

			}

		else if (strcmp(*argv,"-dump") == 0)

			{

			dump= -1;

			}

		else if (strcmp(*argv,"-dlimit") == 0)

			{

			if (--argc < 1) goto bad;

			dump= atoi(*(++argv));

			if (dump <= 0) goto bad;

			}

		else if (strcmp(*argv,"-strparse") == 0)

			{

			if (--argc < 1) goto bad;

			sk_push(osk,*(++argv));

			}

		else if (strcmp(*argv,"-genstr") == 0)

			{

			if (--argc < 1) goto bad;

			genstr= *(++argv);

			}

		else if (strcmp(*argv,"-genconf") == 0)

			{

			if (--argc < 1) goto bad;

			genconf= *(++argv);

			}

		else

			{

			BIO_printf(bio_err,"unknown option %s\n",*argv);

			badops=1;

			break;

			}

		argc--;

		argv++;

		}

	if (badops)

		{

bad:

		BIO_printf(bio_err,"%s [options] <infile\n",prog);

		BIO_printf(bio_err,"where options are\n");

		BIO_printf(bio_err," -inform arg   input format - one of DER PEM\n");

		BIO_printf(bio_err," -in arg       input file\n");

		BIO_printf(bio_err," -out arg      output file (output format is always DER\n");

		BIO_printf(bio_err," -noout arg    don't produce any output\n");

		BIO_printf(bio_err," -offset arg   offset into file\n");

		BIO_printf(bio_err," -length arg   length of section in file\n");

		BIO_printf(bio_err," -i            indent entries\n");

		BIO_printf(bio_err," -dump         dump unknown data in hex form\n");

		BIO_printf(bio_err," -dlimit arg   dump the first arg bytes of unknown data in hex form\n");

		BIO_printf(bio_err," -oid file     file of extra oid definitions\n");

		BIO_printf(bio_err," -strparse offset\n");

		BIO_printf(bio_err,"               a series of these can be used to 'dig' into multiple\n");

		BIO_printf(bio_err,"               ASN1 blob wrappings\n");

		BIO_printf(bio_err," -genstr str   string to generate ASN1 structure from\n");

		BIO_printf(bio_err," -genconf file file to generate ASN1 structure from\n");

		goto end;

		}

	ERR_load_crypto_strings();

	in=BIO_new(BIO_s_file());

	out=BIO_new(BIO_s_file());

	if ((in == NULL) || (out == NULL))

		{

		ERR_print_errors(bio_err);

		goto end;

		}

	BIO_set_fp(out,stdout,BIO_NOCLOSE|BIO_FP_TEXT);

#ifdef OPENSSL_SYS_VMS

	{

	BIO *tmpbio = BIO_new(BIO_f_linebuffer());

	out = BIO_push(tmpbio, out);

	}

#endif

	if (oidfile != NULL)

		{

		if (BIO_read_filename(in,oidfile) <= 0)

			{

			BIO_printf(bio_err,"problems opening %s\n",oidfile);

			ERR_print_errors(bio_err);

			goto end;

			}

		OBJ_create_objects(in);

		}

	if (infile == NULL)

		BIO_set_fp(in,stdin,BIO_NOCLOSE);

	else

		{

		if (BIO_read_filename(in,infile) <= 0)

			{

			perror(infile);

			goto end;

			}

		}

	if (derfile) {

		if(!(derout = BIO_new_file(derfile, "wb"))) {

			BIO_printf(bio_err,"problems opening %s\n",derfile);

			ERR_print_errors(bio_err);

			goto end;

		}

	}

	if ((buf=BUF_MEM_new()) == NULL) goto end;

	if (!BUF_MEM_grow(buf,BUFSIZ*8)) goto end; /* Pre-allocate :-) */

	if (genstr || genconf)

		{

		num = do_generate(bio_err, genstr, genconf, buf);

		if (num < 0)

			{

			ERR_print_errors(bio_err);

			goto end;

			}

		}

	else

		{

		if (informat == FORMAT_PEM)

			{

			BIO *tmp;

			if ((b64=BIO_new(BIO_f_base64())) == NULL)

				goto end;

			BIO_push(b64,in);

			tmp=in;

			in=b64;

			b64=tmp;

			}

		num=0;

		for (;;)

			{

			if (!BUF_MEM_grow(buf,(int)num+BUFSIZ)) goto end;

			i=BIO_read(in,&(buf->data[num]),BUFSIZ);

			if (i <= 0) break;

			num+=i;

			}

		}

	str=buf->data;

	/* If any structs to parse go through in sequence */

	if (sk_num(osk))

		{

		tmpbuf=(unsigned char *)str;

		tmplen=num;

		for (i=0; i<sk_num(osk); i++)

			{

			ASN1_TYPE *atmp;

			int typ;

			j=atoi(sk_value(osk,i));

			if (j == 0)

				{

				BIO_printf(bio_err,"'%s' is an invalid number\n",sk_value(osk,i));

				continue;

				}

			tmpbuf+=j;

			tmplen-=j;

			atmp = at;

			ctmpbuf = tmpbuf;

			at = d2i_ASN1_TYPE(NULL,&ctmpbuf,tmplen);

			ASN1_TYPE_free(atmp);

			if(!at)

				{

				BIO_printf(bio_err,"Error parsing structure\n");

				ERR_print_errors(bio_err);

				goto end;

				}

			typ = ASN1_TYPE_get(at);

			if ((typ == V_ASN1_OBJECT)

				|| (typ == V_ASN1_NULL))

				{

				BIO_printf(bio_err, "Can't parse %s type\n",

					typ == V_ASN1_NULL ? "NULL" : "OBJECT");

				ERR_print_errors(bio_err);

				goto end;

				}

			/* hmm... this is a little evil but it works */

			tmpbuf=at->value.asn1_string->data;

			tmplen=at->value.asn1_string->length;

			}

		str=(char *)tmpbuf;

		num=tmplen;

		}

	if (offset >= num)

		{

		BIO_printf(bio_err, "Error: offset too large\n");

		goto end;

		}

	num -= offset;

	if ((length == 0) || ((long)length > num)) length=(unsigned int)num;

	if(derout) {

		if(BIO_write(derout, str + offset, length) != (int)length) {

			BIO_printf(bio_err, "Error writing output\n");

			ERR_print_errors(bio_err);

			goto end;

		}

	}

	if (!noout &&

	    !ASN1_parse_dump(out,(unsigned char *)&(str[offset]),length,

		    indent,dump))

		{

		ERR_print_errors(bio_err);

		goto end;

		}

	ret=0;

end:

	BIO_free(derout);

	if (in != NULL) BIO_free(in);

	if (out != NULL) BIO_free_all(out);

	if (b64 != NULL) BIO_free(b64);

	if (ret != 0)

		ERR_print_errors(bio_err);

	if (buf != NULL) BUF_MEM_free(buf);

	if (at != NULL) ASN1_TYPE_free(at);

	if (osk != NULL) sk_free(osk);

	OBJ_cleanup();

	apps_shutdown();

	OPENSSL_EXIT(ret);

	}

static int do_generate(BIO *bio, char *genstr, char *genconf, BUF_MEM *buf)

	{

	CONF *cnf = NULL;

	int len;

	long errline;

	unsigned char *p;

	ASN1_TYPE *atyp = NULL;

	if (genconf)

		{

		cnf = NCONF_new(NULL);

		if (!NCONF_load(cnf, genconf, &errline))

			goto conferr;

		if (!genstr)

			genstr = NCONF_get_string(cnf, "default", "asn1");

		if (!genstr)

			{

			BIO_printf(bio, "Can't find 'asn1' in '%s'\n", genconf);

			goto err;

			}

		}

	atyp = ASN1_generate_nconf(genstr, cnf);

	NCONF_free(cnf);

	if (!atyp)

		return -1;

	len = i2d_ASN1_TYPE(atyp, NULL);

	if (len <= 0)

		goto err;

	if (!BUF_MEM_grow(buf,len))

		goto err;

	p=(unsigned char *)buf->data;

	i2d_ASN1_TYPE(atyp, &p);

	ASN1_TYPE_free(atyp);

	return len;

	conferr:

	if (errline > 0)

		BIO_printf(bio, "Error on line %ld of config file '%s'\n",

							errline, genconf);

	else

		BIO_printf(bio, "Error loading config file '%s'\n", genconf);

	err:

	NCONF_free(cnf);

	ASN1_TYPE_free(atyp);

	return -1;

	}