/* File: report_openssl_version.c
 *
 * This file dynamically loads the OpenSSL shared image to report the
 * version string.
 *
 * It will optionally place that version string in a DCL symbol.
 *
 * Usage:  report_openssl_version <shared_image> [<dcl_symbol>]
 *
 * Copyright (C) John Malmberg
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 * SPDX-License-Identifier: ISC
 *
 */

#include <dlfcn.h>
#include <openssl/opensslv.h>
#include <openssl/crypto.h>

#include <string.h>
#include <descrip.h>
#include <libclidef.h>
#include <stsdef.h>
#include <errno.h>

unsigned long LIB$SET_SYMBOL(const struct dsc$descriptor_s *symbol,
                             const struct dsc$descriptor_s *value,
                             const unsigned long *table_type);

int main(int argc, char **argv)
{
  void *libptr;
  const char *(*ssl_version)(int t);
  const char *version;

  if(argc < 1) {
    puts("report_openssl_version filename");
    return 1;
  }

  libptr = dlopen(argv[1], 0);

  ssl_version = (const char *(*)(int))dlsym(libptr, "SSLeay_version");
  if(!ssl_version) {
    ssl_version = (const char *(*)(int))dlsym(libptr, "ssleay_version");
    if(!ssl_version) {
      ssl_version = (const char *(*)(int))dlsym(libptr, "SSLEAY_VERSION");
    }
  }

  dlclose(libptr);

  if(!ssl_version) {
    puts("Unable to lookup version of OpenSSL");
    return 1;
  }

  version = ssl_version(SSLEAY_VERSION);

  puts(version);

  /* Was a symbol argument given? */
  if(argc > 1) {
    int status;
    struct dsc$descriptor_s symbol_dsc;
    struct dsc$descriptor_s value_dsc;
    const unsigned long table_type = LIB$K_CLI_LOCAL_SYM;

    symbol_dsc.dsc$a_pointer = argv[2];
    symbol_dsc.dsc$w_length = strlen(argv[2]);
    symbol_dsc.dsc$b_dtype = DSC$K_DTYPE_T;
    symbol_dsc.dsc$b_class = DSC$K_CLASS_S;

    value_dsc.dsc$a_pointer = (char *)version; /* Cast ok */
    value_dsc.dsc$w_length = strlen(version);
    value_dsc.dsc$b_dtype = DSC$K_DTYPE_T;
    value_dsc.dsc$b_class = DSC$K_CLASS_S;

    status = LIB$SET_SYMBOL(&symbol_dsc, &value_dsc, &table_type);
    if(!$VMS_STATUS_SUCCESS(status)) {
      return status;
    }
  }

  return 0;
}