/* 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;

 	}