This file is indexed.

/usr/include/mysql/sslopt-case.h is in libmysqlclient-dev 5.7.21-1ubuntu1.

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The actual contents of the file can be viewed below.

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/* Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */

#if defined(HAVE_OPENSSL) && !defined(EMBEDDED_LIBRARY)

#ifndef MYSQL_CLIENT
#error This header is supposed to be used only in the client
#endif

    case OPT_SSL_MODE:
      opt_ssl_mode= find_type_or_exit(argument, &ssl_mode_typelib,
                                      opt->name);
      ssl_mode_set_explicitly= TRUE;
      break;
    case OPT_SSL_SSL:
      CLIENT_WARN_DEPRECATED("--ssl", "--ssl-mode");
      if (!opt_use_ssl_arg)
        opt_ssl_mode= SSL_MODE_DISABLED;
      else if (opt_ssl_mode < SSL_MODE_REQUIRED)
        opt_ssl_mode= SSL_MODE_REQUIRED;
      break;
    case OPT_SSL_VERIFY_SERVER_CERT:
      CLIENT_WARN_DEPRECATED("--ssl-verify-server-cert",
                             "--ssl-mode=VERIFY_IDENTITY");
      if (!opt_ssl_verify_server_cert_arg)
      {
        if (opt_ssl_mode >= SSL_MODE_VERIFY_IDENTITY)
          opt_ssl_mode= SSL_MODE_VERIFY_CA;
      }
      else
        opt_ssl_mode= SSL_MODE_VERIFY_IDENTITY;
      break;
    case OPT_SSL_CA:
    case OPT_SSL_CAPATH:
      /* Don't change ssl-mode if set explicitly. */ 
      if (!ssl_mode_set_explicitly)
        opt_ssl_mode= SSL_MODE_VERIFY_CA;
      break;
    case OPT_SSL_KEY:
    case OPT_SSL_CERT:
    case OPT_SSL_CIPHER:
    case OPT_SSL_CRL:
    case OPT_SSL_CRLPATH:
    case OPT_TLS_VERSION:
#ifdef HAVE_YASSL
      /* crl has no effect in yaSSL. */
      opt_ssl_crl= NULL;
      opt_ssl_crlpath= NULL;
#endif /* HAVE_YASSL */
      break;
#endif /* HAVE_OPENSSL */