text: /*	$NetBSD: asn1_print.c,v 1.1.1.2 2014/04/24 12:45:28 pettai Exp $	*/
  
  /*
   * Copyright (c) 1997 - 2005 Kungliga Tekniska Högskolan
   * (Royal Institute of Technology, Stockholm, Sweden).
   * All rights reserved.
   *
   * Portions Copyright (c) 2009 Apple Inc. All rights reserved.
   *
   * 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 above 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. Neither the name of the Institute nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``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 INSTITUTE 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.
   */
  
  #include "der_locl.h"
  #include <krb5/com_err.h>
  #include <sys/types.h>
  #include <sys/stat.h>
  #include <krb5/getarg.h>
  #include <err.h>
  #include <krb5/der.h>
  
  static int indent_flag = 1;
  static int inner_flag = 0;
  
  static unsigned long indefinite_form_loop;
  static unsigned long indefinite_form_loop_max = 10000;
  
  static size_t
  loop (unsigned char *buf, size_t len, int indent)
  {
      unsigned char *start_buf = buf;
  
      while (len > 0) {
  	int ret;
  	Der_class class;
  	Der_type type;
  	unsigned int tag;
  	size_t sz;
  	size_t length;
  	size_t loop_length = 0;
  	int end_tag = 0;
  	const char *tagname;
  
  	ret = der_get_tag (buf, len, &class, &type, &tag, &sz);
  	if (ret)
  	    errx (1, "der_get_tag: %s", error_message (ret));
  	if (sz > len)
  	    errx (1, "unreasonable length (%u) > %u",
  		  (unsigned)sz, (unsigned)len);
  	buf += sz;
  	len -= sz;
  	if (indent_flag) {
  	    int i;
  	    for (i = 0; i < indent; ++i)
  		printf (" ");
  	}
  	printf ("%s %s ", der_get_class_name(class), der_get_type_name(type));
  	tagname = der_get_tag_name(tag);
  	if (class == ASN1_C_UNIV && tagname != NULL)
  	    printf ("%s = ", tagname);
  	else
  	    printf ("tag %d = ", tag);
  	ret = der_get_length (buf, len, &length, &sz);
  	if (ret)
  	    errx (1, "der_get_tag: %s", error_message (ret));
  	if (sz > len)
  	    errx (1, "unreasonable tag length (%u) > %u",
  		  (unsigned)sz, (unsigned)len);
  	buf += sz;
  	len -= sz;
  	if (length == ASN1_INDEFINITE) {
  	    if ((class == ASN1_C_UNIV && type == PRIM && tag == UT_OctetString) ||
  		(class == ASN1_C_CONTEXT && type == CONS) ||
  		(class == ASN1_C_UNIV && type == CONS && tag == UT_Sequence) ||
  		(class == ASN1_C_UNIV && type == CONS && tag == UT_Set)) {
  		printf("*INDEFINITE FORM*");
  	    } else {
  		fflush(stdout);
  		errx(1, "indef form used on unsupported object");
  	    }
  	    end_tag = 1;
  	    if (indefinite_form_loop > indefinite_form_loop_max)
  		errx(1, "indefinite form used recursively more then %lu "
  		     "times, aborting", indefinite_form_loop_max);
  	    indefinite_form_loop++;
  	    length = len;
  	} else if (length > len) {
  	    printf("\n");
  	    fflush(stdout);
  	    errx (1, "unreasonable inner length (%u) > %u",
  		  (unsigned)length, (unsigned)len);
  	}
  	if (class == ASN1_C_CONTEXT || class == ASN1_C_APPL) {
  	    printf ("%lu bytes [%u]", (unsigned long)length, tag);
  	    if (type == CONS) {
  		printf("\n");
  		loop_length = loop (buf, length, indent + 2);
  	    } else {
  		printf(" IMPLICIT content\n");
  	    }
  	} else if (class == ASN1_C_UNIV) {
  	    switch (tag) {
  	    case UT_EndOfContent:
  		printf (" INDEFINITE length was %lu\n",
  			(unsigned long)(buf - start_buf));
  		break;
  	    case UT_Set :
  	    case UT_Sequence :
  		printf ("%lu bytes {\n", (unsigned long)length);
  		loop_length = loop (buf, length, indent + 2);
  		if (indent_flag) {
  		    int i;
  		    for (i = 0; i < indent; ++i)
  			printf (" ");
  		    printf ("}\n");
  		} else
  		    printf ("} indent = %d\n", indent / 2);
  		break;
  	    case UT_Integer : {
  		int val;
  
  		if (length <= sizeof(val)) {
  		    ret = der_get_integer (buf, length, &val, NULL);
  		    if (ret)
  			errx (1, "der_get_integer: %s", error_message (ret));
  		    printf ("integer %d\n", val);
  		} else {
  		    heim_integer vali;
  		    char *p;
  
  		    ret = der_get_heim_integer(buf, length, &vali, NULL);
  		    if (ret)
  			errx (1, "der_get_heim_integer: %s",
  			      error_message (ret));
  		    ret = der_print_hex_heim_integer(&vali, &p);
  		    if (ret)
  			errx (1, "der_print_hex_heim_integer: %s",
  			      error_message (ret));
  		    printf ("BIG NUM integer: length %lu %s\n",
  			    (unsigned long)length, p);
  		    free(p);
  		}
  		break;
  	    }
  	    case UT_OctetString : {
  		heim_octet_string str;
  		size_t i;
  
  		ret = der_get_octet_string (buf, length, &str, NULL);
  		if (ret)
  		    errx (1, "der_get_octet_string: %s", error_message (ret));
  		printf ("(length %lu), ", (unsigned long)length);
  
  		if (inner_flag) {
  		    Der_class class;
  		    Der_type type;
  		    unsigned int tag;
  
  		    ret = der_get_tag(str.data, str.length,
  				      &class, &type, &tag, &sz);
  		    if (ret || sz > str.length ||
  			type != CONS || tag != UT_Sequence)
  			goto just_an_octet_string;
  
  		    printf("{\n");
  		    loop (str.data, str.length, indent + 2);
  		    for (i = 0; i < indent; ++i)
  			printf (" ");
  		    printf ("}\n");
  
  		} else {
  		    unsigned char *uc;
  
  		just_an_octet_string:
  		    uc = (unsigned char *)str.data;
  		    for (i = 0; i < min(16,length); ++i)
  			printf ("%02x", uc[i]);
  		    printf ("\n");
  		}
  		free (str.data);
  		break;
  	    }
  	    case UT_IA5String :
  	    case UT_PrintableString : {
  		heim_printable_string str;
  		unsigned char *s;
  		size_t n;
  
  		memset(&str, 0, sizeof(str));
  
  		ret = der_get_printable_string (buf, length, &str, NULL);
  		if (ret)
  		    errx (1, "der_get_general_string: %s",
  			  error_message (ret));
  		s = str.data;
  		printf("\"");
  		for (n = 0; n < str.length; n++) {
  		    if (isprint((int)s[n]))
  			printf ("%c", s[n]);
  		    else
  			printf ("#%02x", s[n]);
  		}
  		printf("\"\n");
  		der_free_printable_string(&str);
  		break;
  	    }
  	    case UT_GeneralizedTime :
  	    case UT_GeneralString :
  	    case UT_VisibleString :
  	    case UT_UTF8String : {
  		heim_general_string str;
  
  		ret = der_get_general_string (buf, length, &str, NULL);
  		if (ret)
  		    errx (1, "der_get_general_string: %s",
  			  error_message (ret));
  		printf ("\"%s\"\n", str);
  		free (str);
  		break;
  	    }
  	    case UT_OID: {
  		heim_oid o;
  		char *p;
  
  		ret = der_get_oid(buf, length, &o, NULL);
  		if (ret)
  		    errx (1, "der_get_oid: %s", error_message (ret));
  		ret = der_print_heim_oid(&o, '.', &p);
  		der_free_oid(&o);
  		if (ret)
  		    errx (1, "der_print_heim_oid: %s", error_message (ret));
  		printf("%s\n", p);
  		free(p);
  
  		break;
  	    }
  	    case UT_Enumerated: {
  		int num;
  
  		ret = der_get_integer (buf, length, &num, NULL);
  		if (ret)
  		    errx (1, "der_get_enum: %s", error_message (ret));
  
  		printf("%u\n", num);
  		break;
  	    }
  	    default :
  		printf ("%lu bytes\n", (unsigned long)length);
  		break;
  	    }
  	}
  	if (end_tag) {
  	    if (loop_length == 0)
  		errx(1, "zero length INDEFINITE data ? indent = %d\n",
  		     indent / 2);
  	    if (loop_length < length)
  		length = loop_length;
  	    if (indefinite_form_loop == 0)
  		errx(1, "internal error in indefinite form loop detection");
  	    indefinite_form_loop--;
  	} else if (loop_length)
  	    errx(1, "internal error for INDEFINITE form");
  	buf += length;
  	len -= length;
      }
      return 0;
  }
  
  static int
  doit (const char *filename)
  {
      int fd = open (filename, O_RDONLY);
      struct stat sb;
      unsigned char *buf;
      size_t len;
      int ret;
  
      if(fd < 0)
  	err (1, "opening %s for read", filename);
      if (fstat (fd, &sb) < 0)
  	err (1, "stat %s", filename);
      len = sb.st_size;
      buf = emalloc (len);
      if (read (fd, buf, len) != len)
  	errx (1, "read failed");
      close (fd);
      ret = loop (buf, len, 0);
      free (buf);
      return ret;
  }
  
  
  static int version_flag;
  static int help_flag;
  struct getargs args[] = {
      { "indent", 0, arg_negative_flag, &indent_flag },
      { "inner", 0, arg_flag, &inner_flag, "try to parse inner structures of OCTET STRING" },
      { "version", 0, arg_flag, &version_flag },
      { "help", 0, arg_flag, &help_flag }
  };
  int num_args = sizeof(args) / sizeof(args[0]);
  
  static void
  usage(int code)
  {
      arg_printusage(args, num_args, NULL, "dump-file");
      exit(code);
  }
  
  int
  main(int argc, char **argv)
  {
      int optidx = 0;
  
      setprogname (argv[0]);
      initialize_asn1_error_table ();
      if(getarg(args, num_args, argc, argv, &optidx))
  	usage(1);
      if(help_flag)
  	usage(0);
      if(version_flag) {
  	print_version(NULL);
  	exit(0);
      }
      argv += optidx;
      argc -= optidx;
      if (argc != 1)
  	usage (1);
      return doit (argv[0]);
  }
  