text: /*
   * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
   *
   * Licensed under the OpenSSL license (the "License").  You may not use
   * this file except in compliance with the License.  You can obtain a copy
   * in the file LICENSE in the source distribution or at
   * https://www.openssl.org/source/license.html
   */
  
  /*
   * A nice addition from Dr Stephen Henson <steve@openssl.org> 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>
  
  typedef enum OPTION_choice {
      OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
      OPT_INFORM, OPT_IN, OPT_OUT, OPT_INDENT, OPT_NOOUT,
      OPT_OID, OPT_OFFSET, OPT_LENGTH, OPT_DUMP, OPT_DLIMIT,
      OPT_STRPARSE, OPT_GENSTR, OPT_GENCONF, OPT_STRICTPEM
  } OPTION_CHOICE;
  
  OPTIONS asn1parse_options[] = {
      {"help", OPT_HELP, '-', "Display this summary"},
      {"inform", OPT_INFORM, 'F', "input format - one of DER PEM"},
      {"in", OPT_IN, '<', "input file"},
      {"out", OPT_OUT, '>', "output file (output format is always DER)"},
      {"i", OPT_INDENT, 0, "indents the output"},
      {"noout", OPT_NOOUT, 0, "do not produce any output"},
      {"offset", OPT_OFFSET, 'p', "offset into file"},
      {"length", OPT_LENGTH, 'p', "length of section in file"},
      {"oid", OPT_OID, '<', "file of extra oid definitions"},
      {"dump", OPT_DUMP, 0, "unknown data in hex form"},
      {"dlimit", OPT_DLIMIT, 'p',
       "dump the first arg bytes of unknown data in hex form"},
      {"strparse", OPT_STRPARSE, 'p',
       "offset; a series of these can be used to 'dig'"},
      {OPT_MORE_STR, 0, 0, "into multiple ASN1 blob wrappings"},
      {"genstr", OPT_GENSTR, 's', "string to generate ASN1 structure from"},
      {"genconf", OPT_GENCONF, 's', "file to generate ASN1 structure from"},
      {OPT_MORE_STR, 0, 0, "(-inform  will be ignored)"},
      {"strictpem", OPT_STRICTPEM, 0,
       "do not attempt base64 decode outside PEM markers"},
      {NULL}
  };
  
  static int do_generate(char *genstr, const char *genconf, BUF_MEM *buf);
  
  int asn1parse_main(int argc, char **argv)
  {
      ASN1_TYPE *at = NULL;
      BIO *in = NULL, *b64 = NULL, *derout = NULL;
      BUF_MEM *buf = NULL;
      STACK_OF(OPENSSL_STRING) *osk = NULL;
      char *genstr = NULL, *genconf = NULL;
      char *infile = NULL, *oidfile = NULL, *derfile = NULL;
      unsigned char *str = NULL;
      char *name = NULL, *header = NULL, *prog;
      const unsigned char *ctmpbuf;
      int indent = 0, noout = 0, dump = 0, strictpem = 0, informat = FORMAT_PEM;
      int offset = 0, ret = 1, i, j;
      long num, tmplen;
      unsigned char *tmpbuf;
      unsigned int length = 0;
      OPTION_CHOICE o;
  
      prog = opt_init(argc, argv, asn1parse_options);
  
      if ((osk = sk_OPENSSL_STRING_new_null()) == NULL) {
          BIO_printf(bio_err, "%s: Memory allocation failure\n", prog);
          goto end;
      }
  
      while ((o = opt_next()) != OPT_EOF) {
          switch (o) {
          case OPT_EOF:
          case OPT_ERR:
   opthelp:
              BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
              goto end;
          case OPT_HELP:
              opt_help(asn1parse_options);
              ret = 0;
              goto end;
          case OPT_INFORM:
              if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &informat))
                  goto opthelp;
              break;
          case OPT_IN:
              infile = opt_arg();
              break;
          case OPT_OUT:
              derfile = opt_arg();
              break;
          case OPT_INDENT:
              indent = 1;
              break;
          case OPT_NOOUT:
              noout = 1;
              break;
          case OPT_OID:
              oidfile = opt_arg();
              break;
          case OPT_OFFSET:
              offset = strtol(opt_arg(), NULL, 0);
              break;
          case OPT_LENGTH:
              length = strtol(opt_arg(), NULL, 0);
              break;
          case OPT_DUMP:
              dump = -1;
              break;
          case OPT_DLIMIT:
              dump = strtol(opt_arg(), NULL, 0);
              break;
          case OPT_STRPARSE:
              sk_OPENSSL_STRING_push(osk, opt_arg());
              break;
          case OPT_GENSTR:
              genstr = opt_arg();
              break;
          case OPT_GENCONF:
              genconf = opt_arg();
              break;
          case OPT_STRICTPEM:
              strictpem = 1;
              informat = FORMAT_PEM;
              break;
          }
      }
      argc = opt_num_rest();
      if (argc != 0)
          goto opthelp;
  
      if (oidfile != NULL) {
          in = bio_open_default(oidfile, 'r', FORMAT_TEXT);
          if (in == NULL)
              goto end;
          OBJ_create_objects(in);
          BIO_free(in);
      }
  
      if ((in = bio_open_default(infile, 'r', informat)) == NULL)
          goto end;
  
      if (derfile && (derout = bio_open_default(derfile, 'w', FORMAT_ASN1)) == NULL)
          goto end;
  
      if (strictpem) {
          if (PEM_read_bio(in, &name, &header, &str, &num) !=
              1) {
              BIO_printf(bio_err, "Error reading PEM file\n");
              ERR_print_errors(bio_err);
              goto end;
          }
      } else {
  
          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(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, num + BUFSIZ))
                      goto end;
                  i = BIO_read(in, &(buf->data[num]), BUFSIZ);
                  if (i <= 0)
                      break;
                  num += i;
              }
          }
          str = (unsigned char *)buf->data;
  
      }
  
      /* If any structs to parse go through in sequence */
  
      if (sk_OPENSSL_STRING_num(osk)) {
          tmpbuf = str;
          tmplen = num;
          for (i = 0; i < sk_OPENSSL_STRING_num(osk); i++) {
              ASN1_TYPE *atmp;
              int typ;
              j = strtol(sk_OPENSSL_STRING_value(osk, i), NULL, 0);
              if (j <= 0 || j >= tmplen) {
                  BIO_printf(bio_err, "'%s' is out of range\n",
                             sk_OPENSSL_STRING_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_BOOLEAN)
                  || (typ == V_ASN1_NULL)) {
                  BIO_printf(bio_err, "Can't parse %s type\n", ASN1_tag2str(typ));
                  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 = tmpbuf;
          num = tmplen;
      }
  
      if (offset < 0 || offset >= num) {
          BIO_printf(bio_err, "Error: offset out of range\n");
          goto end;
      }
  
      num -= offset;
  
      if (length == 0 || length > (unsigned int)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(bio_out, &(str[offset]), length,
                           indent, dump)) {
          ERR_print_errors(bio_err);
          goto end;
      }
      ret = 0;
   end:
      BIO_free(derout);
      BIO_free(in);
      BIO_free(b64);
      if (ret != 0)
          ERR_print_errors(bio_err);
      BUF_MEM_free(buf);
      OPENSSL_free(name);
      OPENSSL_free(header);
      if (strictpem)
          OPENSSL_free(str);
      ASN1_TYPE_free(at);
      sk_OPENSSL_STRING_free(osk);
      return (ret);
  }
  
  static int do_generate(char *genstr, const char *genconf, BUF_MEM *buf)
  {
      CONF *cnf = NULL;
      int len;
      unsigned char *p;
      ASN1_TYPE *atyp = NULL;
  
      if (genconf) {
          if ((cnf = app_load_config(genconf)) == NULL)
              goto err;
          if (!genstr)
              genstr = NCONF_get_string(cnf, "default", "asn1");
          if (!genstr) {
              BIO_printf(bio_err, "Can't find 'asn1' in '%s'\n", genconf);
              goto err;
          }
      }
  
      atyp = ASN1_generate_nconf(genstr, cnf);
      NCONF_free(cnf);
      cnf = NULL;
  
      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;
  
   err:
      NCONF_free(cnf);
      ASN1_TYPE_free(atyp);
      return -1;
  }
  