programs/ssl/ssl_server2.c - security/mbedtls - Rivoreo Source Code Repositories

 /*
  *  SSL client with options
  *
  *  Copyright (C) 2006-2013, Brainspark B.V.
  *
  *  This file is part of PolarSSL (http://www.polarssl.org)
  *  Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
  *
  *  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; either version 2 of the License, or
  *  (at your option) any later version.
  *
  *  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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */

 #ifndef _CRT_SECURE_NO_DEPRECATE
 #define _CRT_SECURE_NO_DEPRECATE 1
 #endif

 #if defined(_WIN32)
 #include <windows.h>
 #endif

 #include <string.h>
 #include <stdlib.h>
 #include <stdio.h>

 #include "polarssl/config.h"

 #include "polarssl/net.h"
 #include "polarssl/ssl.h"
 #include "polarssl/entropy.h"
 #include "polarssl/ctr_drbg.h"
 #include "polarssl/certs.h"
 #include "polarssl/x509.h"
 #include "polarssl/error.h"

 #if defined(POLARSSL_SSL_CACHE_C)
 #include "polarssl/ssl_cache.h"
 #endif

 #define DFL_SERVER_PORT         4433
 #define DFL_REQUEST_PAGE        "/"
 #define DFL_DEBUG_LEVEL         0
 #define DFL_CA_FILE             ""
 #define DFL_CA_PATH             ""
 #define DFL_CRT_FILE            ""
 #define DFL_KEY_FILE            ""
 #define DFL_PSK                 ""
 #define DFL_PSK_IDENTITY        "Client_identity"
 #define DFL_FORCE_CIPHER        0
 #define DFL_RENEGOTIATION       SSL_RENEGOTIATION_ENABLED
 #define DFL_ALLOW_LEGACY        SSL_LEGACY_NO_RENEGOTIATION
 #define DFL_MIN_VERSION         -1
 #define DFL_MAX_VERSION         -1
 #define DFL_AUTH_MODE           SSL_VERIFY_OPTIONAL

 #define HTTP_RESPONSE \
     "HTTP/1.0 200 OK\r\nContent-Type: text/html\r\n\r\n" \
     "<h2>PolarSSL Test Server</h2>\r\n" \
     "<p>Successful connection using: %s</p>\r\n"

 /*
  * global options
  */
 struct options
 {
     int server_port;            /* port on which the ssl service runs       */
     int debug_level;            /* level of debugging                       */
     const char *ca_file;        /* the file with the CA certificate(s)      */
     const char *ca_path;        /* the path with the CA certificate(s) reside */
     const char *crt_file;       /* the file with the client certificate     */
     const char *key_file;       /* the file with the client key             */
     const char *psk;            /* the pre-shared key                       */
     const char *psk_identity;   /* the pre-shared key identity              */
     int force_ciphersuite[2];   /* protocol/ciphersuite to use, or all      */
     int renegotiation;          /* enable / disable renegotiation           */
     int allow_legacy;           /* allow legacy renegotiation               */
     int min_version;            /* minimum protocol version accepted        */
     int max_version;            /* maximum protocol version accepted        */
     int auth_mode;              /* verify mode for connection               */
 } opt;

 static void my_debug( void *ctx, int level, const char *str )
 {
     if( level < opt.debug_level )
     {
         fprintf( (FILE *) ctx, "%s", str );
         fflush(  (FILE *) ctx  );
     }
 }

 #if defined(POLARSSL_X509_PARSE_C)
 #if defined(POLARSSL_FS_IO)
 #define USAGE_IO \
     "    ca_file=%%s          The single file containing the top-level CA(s) you fully trust\n" \
     "                        default: \"\" (pre-loaded)\n" \
     "    ca_path=%%s          The path containing the top-level CA(s) you fully trust\n" \
     "                        default: \"\" (pre-loaded) (overrides ca_file)\n" \
     "    crt_file=%%s         Your own cert and chain (in bottom to top order, top may be omitted)\n" \
     "                        default: \"\" (pre-loaded)\n" \
     "    key_file=%%s         default: \"\" (pre-loaded)\n"
 #else
 #define USAGE_IO \
     "\n"                                                    \
     "    No file operations available (POLARSSL_FS_IO not defined)\n" \
     "\n"
 #endif /* POLARSSL_FS_IO */
 #else
 #define USAGE_IO ""
 #endif /* POLARSSL_X509_PARSE_C */

 #if defined(POLARSSL_KEY_EXCHANGE_PSK_ENABLED)
 #define USAGE_PSK                                                   \
     "    psk=%%s              default: \"\" (in hex, without 0x)\n" \
     "    psk_identity=%%s     default: \"Client_identity\"\n"
 #else
 #define USAGE_PSK ""
 #endif /* POLARSSL_KEY_EXCHANGE_PSK_ENABLED */

 #define USAGE \
     "\n usage: ssl_server2 param=<>...\n"                   \
     "\n acceptable parameters:\n"                           \
     "    server_port=%%d      default: 4433\n"              \
     "    debug_level=%%d      default: 0 (disabled)\n"      \
     USAGE_IO                                                \
     "    request_page=%%s     default: \".\"\n"             \
     "    renegotiation=%%d    default: 1 (enabled)\n"       \
     "    allow_legacy=%%d     default: 0 (disabled)\n"      \
     "    min_version=%%s      default: \"ssl3\"\n"          \
     "    max_version=%%s      default: \"tls1_2\"\n"        \
     "    force_version=%%s    default: \"\" (none)\n"       \
     "                        options: ssl3, tls1, tls1_1, tls1_2\n" \
     "    auth_mode=%%s        default: \"optional\"\n"      \
     "                        options: none, optional, required\n" \
     USAGE_PSK                                               \
     "\n"                                                    \
     "    force_ciphersuite=<name>    default: all enabled\n"\
     " acceptable ciphersuite names:\n"

 #if !defined(POLARSSL_ENTROPY_C) ||  \
     !defined(POLARSSL_SSL_TLS_C) || !defined(POLARSSL_SSL_SRV_C) || \
     !defined(POLARSSL_NET_C) || !defined(POLARSSL_CTR_DRBG_C)
 int main( int argc, char *argv[] )
 {
     ((void) argc);
     ((void) argv);

     printf("POLARSSL_ENTROPY_C and/or "
            "POLARSSL_SSL_TLS_C and/or POLARSSL_SSL_SRV_C and/or "
            "POLARSSL_NET_C and/or POLARSSL_CTR_DRBG_C not defined.\n");
     return( 0 );
 }
 #else
 int main( int argc, char *argv[] )
 {
     int ret = 0, len;
     int listen_fd;
     int client_fd = -1;
     unsigned char buf[1024];
 #if defined(POLARSSL_KEY_EXCHANGE_PSK_ENABLED)
     unsigned char psk[256];
     size_t psk_len = 0;
 #endif
     const char *pers = "ssl_server2";

     entropy_context entropy;
     ctr_drbg_context ctr_drbg;
     ssl_context ssl;
 #if defined(POLARSSL_X509_PARSE_C)
     x509_cert cacert;
     x509_cert srvcert;
     rsa_context rsa;
 #endif
 #if defined(POLARSSL_SSL_CACHE_C)
     ssl_cache_context cache;
 #endif

     int i;
     char *p, *q;
     const int *list;

     /*
      * Make sure memory references are valid.
      */
     listen_fd = 0;
 #if defined(POLARSSL_X509_PARSE_C)
     memset( &cacert, 0, sizeof( x509_cert ) );
     memset( &srvcert, 0, sizeof( x509_cert ) );
     memset( &rsa, 0, sizeof( rsa_context ) );
 #endif
 #if defined(POLARSSL_SSL_CACHE_C)
     ssl_cache_init( &cache );
 #endif

     if( argc == 0 )
     {
     usage:
         if( ret == 0 )
             ret = 1;

         printf( USAGE );

         list = ssl_list_ciphersuites();
         while( *list )
         {
             printf(" %-42s", ssl_get_ciphersuite_name( *list ) );
             list++;
             if( !*list )
                 break;
             printf(" %s\n", ssl_get_ciphersuite_name( *list ) );
             list++;
         }
         printf("\n");
         goto exit;
     }

     opt.server_port         = DFL_SERVER_PORT;
     opt.debug_level         = DFL_DEBUG_LEVEL;
     opt.ca_file             = DFL_CA_FILE;
     opt.ca_path             = DFL_CA_PATH;
     opt.crt_file            = DFL_CRT_FILE;
     opt.key_file            = DFL_KEY_FILE;
     opt.psk                 = DFL_PSK;
     opt.psk_identity        = DFL_PSK_IDENTITY;
     opt.force_ciphersuite[0]= DFL_FORCE_CIPHER;
     opt.renegotiation       = DFL_RENEGOTIATION;
     opt.allow_legacy        = DFL_ALLOW_LEGACY;
     opt.min_version         = DFL_MIN_VERSION;
     opt.max_version         = DFL_MAX_VERSION;
     opt.auth_mode           = DFL_AUTH_MODE;

     for( i = 1; i < argc; i++ )
     {
         p = argv[i];
         if( ( q = strchr( p, '=' ) ) == NULL )
             goto usage;
         *q++ = '\0';

         if( strcmp( p, "server_port" ) == 0 )
         {
             opt.server_port = atoi( q );
             if( opt.server_port < 1 || opt.server_port > 65535 )
                 goto usage;
         }
         else if( strcmp( p, "debug_level" ) == 0 )
         {
             opt.debug_level = atoi( q );
             if( opt.debug_level < 0 || opt.debug_level > 65535 )
                 goto usage;
         }
         else if( strcmp( p, "ca_file" ) == 0 )
             opt.ca_file = q;
         else if( strcmp( p, "ca_path" ) == 0 )
             opt.ca_path = q;
         else if( strcmp( p, "crt_file" ) == 0 )
             opt.crt_file = q;
         else if( strcmp( p, "key_file" ) == 0 )
             opt.key_file = q;
         else if( strcmp( p, "psk" ) == 0 )
             opt.psk = q;
         else if( strcmp( p, "psk_identity" ) == 0 )
             opt.psk_identity = q;
         else if( strcmp( p, "force_ciphersuite" ) == 0 )
         {
             opt.force_ciphersuite[0] = -1;

             opt.force_ciphersuite[0] = ssl_get_ciphersuite_id( q );

             if( opt.force_ciphersuite[0] <= 0 )
             {
                 ret = 2;
                 goto usage;
             }
             opt.force_ciphersuite[1] = 0;
         }
         else if( strcmp( p, "renegotiation" ) == 0 )
         {
             opt.renegotiation = (atoi( q )) ? SSL_RENEGOTIATION_ENABLED :
                                               SSL_RENEGOTIATION_DISABLED;
         }
         else if( strcmp( p, "allow_legacy" ) == 0 )
         {
             opt.allow_legacy = atoi( q );
             if( opt.allow_legacy < 0 || opt.allow_legacy > 1 )
                 goto usage;
         }
         else if( strcmp( p, "min_version" ) == 0 )
         {
             if( strcmp( q, "ssl3" ) == 0 )
                 opt.min_version = SSL_MINOR_VERSION_0;
             else if( strcmp( q, "tls1" ) == 0 )
                 opt.min_version = SSL_MINOR_VERSION_1;
             else if( strcmp( q, "tls1_1" ) == 0 )
                 opt.min_version = SSL_MINOR_VERSION_2;
             else if( strcmp( q, "tls1_2" ) == 0 )
                 opt.min_version = SSL_MINOR_VERSION_3;
             else
                 goto usage;
         }
         else if( strcmp( p, "max_version" ) == 0 )
         {
             if( strcmp( q, "ssl3" ) == 0 )
                 opt.max_version = SSL_MINOR_VERSION_0;
             else if( strcmp( q, "tls1" ) == 0 )
                 opt.max_version = SSL_MINOR_VERSION_1;
             else if( strcmp( q, "tls1_1" ) == 0 )
                 opt.max_version = SSL_MINOR_VERSION_2;
             else if( strcmp( q, "tls1_2" ) == 0 )
                 opt.max_version = SSL_MINOR_VERSION_3;
             else
                 goto usage;
         }
         else if( strcmp( p, "force_version" ) == 0 )
         {
             if( strcmp( q, "ssl3" ) == 0 )
             {
                 opt.min_version = SSL_MINOR_VERSION_0;
                 opt.max_version = SSL_MINOR_VERSION_0;
             }
             else if( strcmp( q, "tls1" ) == 0 )
             {
                 opt.min_version = SSL_MINOR_VERSION_1;
                 opt.max_version = SSL_MINOR_VERSION_1;
             }
             else if( strcmp( q, "tls1_1" ) == 0 )
             {
                 opt.min_version = SSL_MINOR_VERSION_2;
                 opt.max_version = SSL_MINOR_VERSION_2;
             }
             else if( strcmp( q, "tls1_2" ) == 0 )
             {
                 opt.min_version = SSL_MINOR_VERSION_3;
                 opt.max_version = SSL_MINOR_VERSION_3;
             }
             else
                 goto usage;
         }
         else if( strcmp( p, "auth_mode" ) == 0 )
         {
             if( strcmp( q, "none" ) == 0 )
                 opt.auth_mode = SSL_VERIFY_NONE;
             else if( strcmp( q, "optional" ) == 0 )
                 opt.auth_mode = SSL_VERIFY_OPTIONAL;
             else if( strcmp( q, "required" ) == 0 )
                 opt.auth_mode = SSL_VERIFY_REQUIRED;
             else
                 goto usage;
         }
         else
             goto usage;
     }

     if( opt.force_ciphersuite[0] > 0 )
     {
         const ssl_ciphersuite_t *ciphersuite_info;
         ciphersuite_info = ssl_ciphersuite_from_id( opt.force_ciphersuite[0] );

         if( ciphersuite_info->min_minor_ver > opt.max_version ||
             ciphersuite_info->max_minor_ver < opt.min_version )
         {
             printf("forced ciphersuite not allowed with this protocol version\n");
             ret = 2;
             goto usage;
         }
     }

 #if defined(POLARSSL_KEY_EXCHANGE_PSK_ENABLED)
     /*
      * Unhexify the pre-shared key if any is given
      */
     if( strlen( opt.psk ) )
     {
         unsigned char c;
         size_t j;

         if( strlen( opt.psk ) % 2 != 0 )
         {
             printf("pre-shared key not valid hex\n");
             goto exit;
         }

         psk_len = strlen( opt.psk ) / 2;

         for( j = 0; j < strlen( opt.psk ); j += 2 )
         {
             c = opt.psk[j];
             if( c >= '0' && c <= '9' )
                 c -= '0';
             else if( c >= 'a' && c <= 'f' )
                 c -= 'a' - 10;
             else if( c >= 'A' && c <= 'F' )
                 c -= 'A' - 10;
             else
             {
                 printf("pre-shared key not valid hex\n");
                 goto exit;
             }
             psk[ j / 2 ] = c << 4;

             c = opt.psk[j + 1];
             if( c >= '0' && c <= '9' )
                 c -= '0';
             else if( c >= 'a' && c <= 'f' )
                 c -= 'a' - 10;
             else if( c >= 'A' && c <= 'F' )
                 c -= 'A' - 10;
             else
             {
                 printf("pre-shared key not valid hex\n");
                 goto exit;
             }
             psk[ j / 2 ] |= c;
         }
     }
 #endif /* POLARSSL_KEY_EXCHANGE_PSK_ENABLED */

     /*
      * 0. Initialize the RNG and the session data
      */
     printf( "\n  . Seeding the random number generator..." );
     fflush( stdout );

     entropy_init( &entropy );
     if( ( ret = ctr_drbg_init( &ctr_drbg, entropy_func, &entropy,
                                (const unsigned char *) pers,
                                strlen( pers ) ) ) != 0 )
     {
         printf( " failed\n  ! ctr_drbg_init returned -0x%x\n", -ret );
         goto exit;
     }

     printf( " ok\n" );

 #if defined(POLARSSL_X509_PARSE_C)
     /*
      * 1.1. Load the trusted CA
      */
     printf( "  . Loading the CA root certificate ..." );
     fflush( stdout );

 #if defined(POLARSSL_FS_IO)
     if( strlen( opt.ca_path ) )
         ret = x509parse_crtpath( &cacert, opt.ca_path );
     else if( strlen( opt.ca_file ) )
         ret = x509parse_crtfile( &cacert, opt.ca_file );
     else
 #endif
 #if defined(POLARSSL_CERTS_C)
         ret = x509parse_crt( &cacert, (const unsigned char *) test_ca_crt,
                 strlen( test_ca_crt ) );
 #else
     {
         ret = 1;
         printf("POLARSSL_CERTS_C not defined.");
     }
 #endif
     if( ret < 0 )
     {
         printf( " failed\n  !  x509parse_crt returned -0x%x\n\n", -ret );
         goto exit;
     }

     printf( " ok (%d skipped)\n", ret );

     /*
      * 1.2. Load own certificate and private key
      */
     printf( "  . Loading the server cert. and key..." );
     fflush( stdout );

 #if defined(POLARSSL_FS_IO)
     if( strlen( opt.crt_file ) )
         ret = x509parse_crtfile( &srvcert, opt.crt_file );
     else
 #endif
 #if defined(POLARSSL_CERTS_C)
         ret = x509parse_crt( &srvcert, (const unsigned char *) test_srv_crt,
                 strlen( test_srv_crt ) );
 #else
     {
         ret = 1;
         printf("POLARSSL_CERTS_C not defined.");
     }
 #endif
     if( ret != 0 )
     {
         printf( " failed\n  !  x509parse_crt returned -0x%x\n\n", -ret );
         goto exit;
     }

 #if defined(POLARSSL_FS_IO)
     if( strlen( opt.key_file ) )
         ret = x509parse_keyfile( &rsa, opt.key_file, "" );
     else
 #endif
 #if defined(POLARSSL_CERTS_C)
         ret = x509parse_key( &rsa, (const unsigned char *) test_srv_key,
                 strlen( test_srv_key ), NULL, 0 );
 #else
     {
         ret = 1;
         printf("POLARSSL_CERTS_C not defined.");
     }
 #endif
     if( ret != 0 )
     {
         printf( " failed\n  !  x509parse_key returned -0x%x\n\n", -ret );
         goto exit;
     }

     printf( " ok\n" );
 #endif /* POLARSSL_X509_PARSE_C */

     /*
      * 2. Setup the listening TCP socket
      */
     printf( "  . Bind on tcp://localhost:%-4d/ ...", opt.server_port );
     fflush( stdout );

     if( ( ret = net_bind( &listen_fd, NULL, opt.server_port ) ) != 0 )
     {
         printf( " failed\n  ! net_bind returned -0x%x\n\n", -ret );
         goto exit;
     }

     printf( " ok\n" );

     /*
      * 3. Setup stuff
      */
     printf( "  . Setting up the SSL/TLS structure..." );
     fflush( stdout );

     if( ( ret = ssl_init( &ssl ) ) != 0 )
     {
         printf( " failed\n  ! ssl_init returned -0x%x\n\n", -ret );
         goto exit;
     }

     ssl_set_endpoint( &ssl, SSL_IS_SERVER );
     ssl_set_authmode( &ssl, opt.auth_mode );

     ssl_set_rng( &ssl, ctr_drbg_random, &ctr_drbg );
     ssl_set_dbg( &ssl, my_debug, stdout );

 #if defined(POLARSSL_SSL_CACHE_C)
     ssl_set_session_cache( &ssl, ssl_cache_get, &cache,
                                  ssl_cache_set, &cache );
 #endif

     if( opt.force_ciphersuite[0] != DFL_FORCE_CIPHER )
         ssl_set_ciphersuites( &ssl, opt.force_ciphersuite );

     ssl_set_renegotiation( &ssl, opt.renegotiation );
     ssl_legacy_renegotiation( &ssl, opt.allow_legacy );

 #if defined(POLARSSL_X509_PARSE_C)
     ssl_set_ca_chain( &ssl, &cacert, NULL, NULL );
     ssl_set_own_cert( &ssl, &srvcert, &rsa );
 #endif

 #if defined(POLARSSL_KEY_EXCHANGE_PSK_ENABLED)
     ssl_set_psk( &ssl, psk, psk_len, (const unsigned char *) opt.psk_identity,
                  strlen( opt.psk_identity ) );
 #endif

 #if defined(POLARSSL_DHM_C)
     /*
      * Use different group than default DHM group
      */
     ssl_set_dh_param( &ssl, POLARSSL_DHM_RFC5114_MODP_2048_P,
                             POLARSSL_DHM_RFC5114_MODP_2048_G );
 #endif

     if( opt.min_version != -1 )
         ssl_set_min_version( &ssl, SSL_MAJOR_VERSION_3, opt.min_version );

     if( opt.max_version != -1 )
         ssl_set_max_version( &ssl, SSL_MAJOR_VERSION_3, opt.max_version );

     printf( " ok\n" );

 reset:
 #ifdef POLARSSL_ERROR_C
     if( ret != 0 )
     {
         char error_buf[100];
         polarssl_strerror( ret, error_buf, 100 );
         printf("Last error was: %d - %s\n\n", ret, error_buf );
     }
 #endif

     if( client_fd != -1 )
         net_close( client_fd );

     ssl_session_reset( &ssl );

     /*
      * 3. Wait until a client connects
      */
 #if defined(_WIN32_WCE)
     {
         SHELLEXECUTEINFO sei;

         ZeroMemory( &sei, sizeof( SHELLEXECUTEINFO ) );

         sei.cbSize = sizeof( SHELLEXECUTEINFO );
         sei.fMask = 0;
         sei.hwnd = 0;
         sei.lpVerb = _T( "open" );
         sei.lpFile = _T( "https://localhost:4433/" );
         sei.lpParameters = NULL;
         sei.lpDirectory = NULL;
         sei.nShow = SW_SHOWNORMAL;

         ShellExecuteEx( &sei );
     }
 #elif defined(_WIN32)
     ShellExecute( NULL, "open", "https://localhost:4433/",
                   NULL, NULL, SW_SHOWNORMAL );
 #endif

     client_fd = -1;

     printf( "  . Waiting for a remote connection ..." );
     fflush( stdout );

     if( ( ret = net_accept( listen_fd, &client_fd, NULL ) ) != 0 )
     {
         printf( " failed\n  ! net_accept returned -0x%x\n\n", -ret );
         goto exit;
     }

     ssl_set_bio( &ssl, net_recv, &client_fd,
                        net_send, &client_fd );

     printf( " ok\n" );

     /*
      * 4. Handshake
      */
     printf( "  . Performing the SSL/TLS handshake..." );
     fflush( stdout );

     while( ( ret = ssl_handshake( &ssl ) ) != 0 )
     {
         if( ret != POLARSSL_ERR_NET_WANT_READ && ret != POLARSSL_ERR_NET_WANT_WRITE )
         {
             printf( " failed\n  ! ssl_handshake returned -0x%x\n\n", -ret );
             goto reset;
         }
     }

     printf( " ok\n    [ Ciphersuite is %s ]\n",
             ssl_get_ciphersuite( &ssl ) );

 #if defined(POLARSSL_X509_PARSE_C)
     /*
      * 5. Verify the server certificate
      */
     printf( "  . Verifying peer X.509 certificate..." );

     if( ( ret = ssl_get_verify_result( &ssl ) ) != 0 )
     {
         printf( " failed\n" );

         if( !ssl_get_peer_cert( &ssl ) )
             printf( "  ! no client certificate sent\n" );

         if( ( ret & BADCERT_EXPIRED ) != 0 )
             printf( "  ! client certificate has expired\n" );

         if( ( ret & BADCERT_REVOKED ) != 0 )
             printf( "  ! client certificate has been revoked\n" );

         if( ( ret & BADCERT_NOT_TRUSTED ) != 0 )
             printf( "  ! self-signed or not signed by a trusted CA\n" );

         printf( "\n" );
     }
     else
         printf( " ok\n" );

     if( ssl_get_peer_cert( &ssl ) )
     {
         printf( "  . Peer certificate information    ...\n" );
         x509parse_cert_info( (char *) buf, sizeof( buf ) - 1, "      ",
                              ssl_get_peer_cert( &ssl ) );
         printf( "%s\n", buf );
     }
 #endif /* POLARSSL_X509_PARSE_C */

     /*
      * 6. Read the HTTP Request
      */
     printf( "  < Read from client:" );
     fflush( stdout );

     do
     {
         len = sizeof( buf ) - 1;
         memset( buf, 0, sizeof( buf ) );
         ret = ssl_read( &ssl, buf, len );

         if( ret == POLARSSL_ERR_NET_WANT_READ || ret == POLARSSL_ERR_NET_WANT_WRITE )
             continue;

         if( ret <= 0 )
         {
             switch( ret )
             {
                 case POLARSSL_ERR_SSL_PEER_CLOSE_NOTIFY:
                     printf( " connection was closed gracefully\n" );
                     break;

                 case POLARSSL_ERR_NET_CONN_RESET:
                     printf( " connection was reset by peer\n" );
                     break;

                 default:
                     printf( " ssl_read returned -0x%x\n", -ret );
                     break;
             }

             break;
         }

         len = ret;
         printf( " %d bytes read\n\n%s", len, (char *) buf );

         if( ret > 0 )
             break;
     }
     while( 1 );

     /*
      * 7. Write the 200 Response
      */
     printf( "  > Write to client:" );
     fflush( stdout );

     len = sprintf( (char *) buf, HTTP_RESPONSE,
                    ssl_get_ciphersuite( &ssl ) );

     while( ( ret = ssl_write( &ssl, buf, len ) ) <= 0 )
     {
         if( ret == POLARSSL_ERR_NET_CONN_RESET )
         {
             printf( " failed\n  ! peer closed the connection\n\n" );
             goto reset;
         }

         if( ret != POLARSSL_ERR_NET_WANT_READ && ret != POLARSSL_ERR_NET_WANT_WRITE )
         {
             printf( " failed\n  ! ssl_write returned %d\n\n", ret );
             goto exit;
         }
     }

     len = ret;
     printf( " %d bytes written\n\n%s\n", len, (char *) buf );

     ret = 0;
     goto reset;

 exit:

 #ifdef POLARSSL_ERROR_C
     if( ret != 0 )
     {
         char error_buf[100];
         polarssl_strerror( ret, error_buf, 100 );
         printf("Last error was: -0x%X - %s\n\n", -ret, error_buf );
     }
 #endif

     net_close( client_fd );
 #if defined(POLARSSL_X509_PARSE_C)
     x509_free( &srvcert );
     x509_free( &cacert );
     rsa_free( &rsa );
 #endif

     ssl_free( &ssl );

 #if defined(POLARSSL_SSL_CACHE_C)
     ssl_cache_free( &cache );
 #endif

 #if defined(_WIN32)
     printf( "  + Press Enter to exit this program.\n" );
     fflush( stdout ); getchar();
 #endif

     return( ret );
 }
 #endif /* POLARSSL_BIGNUM_C && POLARSSL_ENTROPY_C && POLARSSL_SSL_TLS_C &&
           POLARSSL_SSL_SRV_C && POLARSSL_NET_C && POLARSSL_RSA_C &&
           POLARSSL_CTR_DRBG_C */
	/*
	* SSL client with options
	*
	* Copyright (C) 2006-2013, Brainspark B.V.
	*
	* This file is part of PolarSSL (http://www.polarssl.org)
	* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
	*
	* 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; either version 2 of the License, or
	* (at your option) any later version.
	*
	* 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
	*/

	#ifndef _CRT_SECURE_NO_DEPRECATE
	#define _CRT_SECURE_NO_DEPRECATE 1
	#endif

	#if defined(_WIN32)
	#include <windows.h>
	#endif

	#include <string.h>
	#include <stdlib.h>
	#include <stdio.h>

	#include "polarssl/config.h"

	#include "polarssl/net.h"
	#include "polarssl/ssl.h"
	#include "polarssl/entropy.h"
	#include "polarssl/ctr_drbg.h"
	#include "polarssl/certs.h"
	#include "polarssl/x509.h"
	#include "polarssl/error.h"

	#if defined(POLARSSL_SSL_CACHE_C)
	#include "polarssl/ssl_cache.h"
	#endif

	#define DFL_SERVER_PORT 4433
	#define DFL_REQUEST_PAGE "/"
	#define DFL_DEBUG_LEVEL 0
	#define DFL_CA_FILE ""
	#define DFL_CA_PATH ""
	#define DFL_CRT_FILE ""
	#define DFL_KEY_FILE ""
	#define DFL_PSK ""
	#define DFL_PSK_IDENTITY "Client_identity"
	#define DFL_FORCE_CIPHER 0
	#define DFL_RENEGOTIATION SSL_RENEGOTIATION_ENABLED
	#define DFL_ALLOW_LEGACY SSL_LEGACY_NO_RENEGOTIATION
	#define DFL_MIN_VERSION -1
	#define DFL_MAX_VERSION -1
	#define DFL_AUTH_MODE SSL_VERIFY_OPTIONAL

	#define HTTP_RESPONSE \
	"HTTP/1.0 200 OK\r\nContent-Type: text/html\r\n\r\n" \
	"<h2>PolarSSL Test Server</h2>\r\n" \
	"<p>Successful connection using: %s</p>\r\n"

	/*
	* global options
	*/
	struct options
	{
	int server_port; /* port on which the ssl service runs */
	int debug_level; /* level of debugging */
	const char ca_file; / the file with the CA certificate(s) */
	const char ca_path; / the path with the CA certificate(s) reside */
	const char crt_file; / the file with the client certificate */
	const char key_file; / the file with the client key */
	const char psk; / the pre-shared key */
	const char psk_identity; / the pre-shared key identity */
	int force_ciphersuite[2]; /* protocol/ciphersuite to use, or all */
	int renegotiation; /* enable / disable renegotiation */
	int allow_legacy; /* allow legacy renegotiation */
	int min_version; /* minimum protocol version accepted */
	int max_version; /* maximum protocol version accepted */
	int auth_mode; /* verify mode for connection */
	} opt;

	static void my_debug( void ctx, int level, const char str )
	{
	if( level < opt.debug_level )
	{
	fprintf( (FILE *) ctx, "%s", str );
	fflush( (FILE *) ctx );
	}
	}

	#if defined(POLARSSL_X509_PARSE_C)
	#if defined(POLARSSL_FS_IO)
	#define USAGE_IO \
	" ca_file=%%s The single file containing the top-level CA(s) you fully trust\n" \
	" default: \"\" (pre-loaded)\n" \
	" ca_path=%%s The path containing the top-level CA(s) you fully trust\n" \
	" default: \"\" (pre-loaded) (overrides ca_file)\n" \
	" crt_file=%%s Your own cert and chain (in bottom to top order, top may be omitted)\n" \
	" default: \"\" (pre-loaded)\n" \
	" key_file=%%s default: \"\" (pre-loaded)\n"
	#else
	#define USAGE_IO \
	"\n" \
	" No file operations available (POLARSSL_FS_IO not defined)\n" \
	"\n"
	#endif /* POLARSSL_FS_IO */
	#else
	#define USAGE_IO ""
	#endif /* POLARSSL_X509_PARSE_C */

	#if defined(POLARSSL_KEY_EXCHANGE_PSK_ENABLED)
	#define USAGE_PSK \
	" psk=%%s default: \"\" (in hex, without 0x)\n" \
	" psk_identity=%%s default: \"Client_identity\"\n"
	#else
	#define USAGE_PSK ""
	#endif /* POLARSSL_KEY_EXCHANGE_PSK_ENABLED */

	#define USAGE \
	"\n usage: ssl_server2 param=<>...\n" \
	"\n acceptable parameters:\n" \
	" server_port=%%d default: 4433\n" \
	" debug_level=%%d default: 0 (disabled)\n" \
	USAGE_IO \
	" request_page=%%s default: \".\"\n" \
	" renegotiation=%%d default: 1 (enabled)\n" \
	" allow_legacy=%%d default: 0 (disabled)\n" \
	" min_version=%%s default: \"ssl3\"\n" \
	" max_version=%%s default: \"tls1_2\"\n" \
	" force_version=%%s default: \"\" (none)\n" \
	" options: ssl3, tls1, tls1_1, tls1_2\n" \
	" auth_mode=%%s default: \"optional\"\n" \
	" options: none, optional, required\n" \
	USAGE_PSK \
	"\n" \
	" force_ciphersuite=<name> default: all enabled\n"\
	" acceptable ciphersuite names:\n"

	#if !defined(POLARSSL_ENTROPY_C) \|\| \
	!defined(POLARSSL_SSL_TLS_C) \|\| !defined(POLARSSL_SSL_SRV_C) \|\| \
	!defined(POLARSSL_NET_C) \|\| !defined(POLARSSL_CTR_DRBG_C)
	int main( int argc, char *argv[] )
	{
	((void) argc);
	((void) argv);

	printf("POLARSSL_ENTROPY_C and/or "
	"POLARSSL_SSL_TLS_C and/or POLARSSL_SSL_SRV_C and/or "
	"POLARSSL_NET_C and/or POLARSSL_CTR_DRBG_C not defined.\n");
	return( 0 );
	}
	#else
	int main( int argc, char *argv[] )
	{
	int ret = 0, len;
	int listen_fd;
	int client_fd = -1;
	unsigned char buf[1024];
	#if defined(POLARSSL_KEY_EXCHANGE_PSK_ENABLED)
	unsigned char psk[256];
	size_t psk_len = 0;
	#endif
	const char *pers = "ssl_server2";

	entropy_context entropy;
	ctr_drbg_context ctr_drbg;
	ssl_context ssl;
	#if defined(POLARSSL_X509_PARSE_C)
	x509_cert cacert;
	x509_cert srvcert;
	rsa_context rsa;
	#endif
	#if defined(POLARSSL_SSL_CACHE_C)
	ssl_cache_context cache;
	#endif

	int i;
	char p, q;
	const int *list;

	/*
	* Make sure memory references are valid.
	*/
	listen_fd = 0;
	#if defined(POLARSSL_X509_PARSE_C)
	memset( &cacert, 0, sizeof( x509_cert ) );
	memset( &srvcert, 0, sizeof( x509_cert ) );
	memset( &rsa, 0, sizeof( rsa_context ) );
	#endif
	#if defined(POLARSSL_SSL_CACHE_C)
	ssl_cache_init( &cache );
	#endif

	if( argc == 0 )
	{
	usage:
	if( ret == 0 )
	ret = 1;

	printf( USAGE );

	list = ssl_list_ciphersuites();
	while( *list )
	{
	printf(" %-42s", ssl_get_ciphersuite_name( *list ) );
	list++;
	if( !*list )
	break;
	printf(" %s\n", ssl_get_ciphersuite_name( *list ) );
	list++;
	}
	printf("\n");
	goto exit;
	}

	opt.server_port = DFL_SERVER_PORT;
	opt.debug_level = DFL_DEBUG_LEVEL;
	opt.ca_file = DFL_CA_FILE;
	opt.ca_path = DFL_CA_PATH;
	opt.crt_file = DFL_CRT_FILE;
	opt.key_file = DFL_KEY_FILE;
	opt.psk = DFL_PSK;
	opt.psk_identity = DFL_PSK_IDENTITY;
	opt.force_ciphersuite[0]= DFL_FORCE_CIPHER;
	opt.renegotiation = DFL_RENEGOTIATION;
	opt.allow_legacy = DFL_ALLOW_LEGACY;
	opt.min_version = DFL_MIN_VERSION;
	opt.max_version = DFL_MAX_VERSION;
	opt.auth_mode = DFL_AUTH_MODE;

	for( i = 1; i < argc; i++ )
	{
	p = argv[i];
	if( ( q = strchr( p, '=' ) ) == NULL )
	goto usage;
	*q++ = '\0';

	if( strcmp( p, "server_port" ) == 0 )
	{
	opt.server_port = atoi( q );
	if( opt.server_port < 1 \|\| opt.server_port > 65535 )
	goto usage;
	}
	else if( strcmp( p, "debug_level" ) == 0 )
	{
	opt.debug_level = atoi( q );
	if( opt.debug_level < 0 \|\| opt.debug_level > 65535 )
	goto usage;
	}
	else if( strcmp( p, "ca_file" ) == 0 )
	opt.ca_file = q;
	else if( strcmp( p, "ca_path" ) == 0 )
	opt.ca_path = q;
	else if( strcmp( p, "crt_file" ) == 0 )
	opt.crt_file = q;
	else if( strcmp( p, "key_file" ) == 0 )
	opt.key_file = q;
	else if( strcmp( p, "psk" ) == 0 )
	opt.psk = q;
	else if( strcmp( p, "psk_identity" ) == 0 )
	opt.psk_identity = q;
	else if( strcmp( p, "force_ciphersuite" ) == 0 )
	{
	opt.force_ciphersuite[0] = -1;

	opt.force_ciphersuite[0] = ssl_get_ciphersuite_id( q );

	if( opt.force_ciphersuite[0] <= 0 )
	{
	ret = 2;
	goto usage;
	}
	opt.force_ciphersuite[1] = 0;
	}
	else if( strcmp( p, "renegotiation" ) == 0 )
	{
	opt.renegotiation = (atoi( q )) ? SSL_RENEGOTIATION_ENABLED :
	SSL_RENEGOTIATION_DISABLED;
	}
	else if( strcmp( p, "allow_legacy" ) == 0 )
	{
	opt.allow_legacy = atoi( q );
	if( opt.allow_legacy < 0 \|\| opt.allow_legacy > 1 )
	goto usage;
	}
	else if( strcmp( p, "min_version" ) == 0 )
	{
	if( strcmp( q, "ssl3" ) == 0 )
	opt.min_version = SSL_MINOR_VERSION_0;
	else if( strcmp( q, "tls1" ) == 0 )
	opt.min_version = SSL_MINOR_VERSION_1;
	else if( strcmp( q, "tls1_1" ) == 0 )
	opt.min_version = SSL_MINOR_VERSION_2;
	else if( strcmp( q, "tls1_2" ) == 0 )
	opt.min_version = SSL_MINOR_VERSION_3;
	else
	goto usage;
	}
	else if( strcmp( p, "max_version" ) == 0 )
	{
	if( strcmp( q, "ssl3" ) == 0 )
	opt.max_version = SSL_MINOR_VERSION_0;
	else if( strcmp( q, "tls1" ) == 0 )
	opt.max_version = SSL_MINOR_VERSION_1;
	else if( strcmp( q, "tls1_1" ) == 0 )
	opt.max_version = SSL_MINOR_VERSION_2;
	else if( strcmp( q, "tls1_2" ) == 0 )
	opt.max_version = SSL_MINOR_VERSION_3;
	else
	goto usage;
	}
	else if( strcmp( p, "force_version" ) == 0 )
	{
	if( strcmp( q, "ssl3" ) == 0 )
	{
	opt.min_version = SSL_MINOR_VERSION_0;
	opt.max_version = SSL_MINOR_VERSION_0;
	}
	else if( strcmp( q, "tls1" ) == 0 )
	{
	opt.min_version = SSL_MINOR_VERSION_1;
	opt.max_version = SSL_MINOR_VERSION_1;
	}
	else if( strcmp( q, "tls1_1" ) == 0 )
	{
	opt.min_version = SSL_MINOR_VERSION_2;
	opt.max_version = SSL_MINOR_VERSION_2;
	}
	else if( strcmp( q, "tls1_2" ) == 0 )
	{
	opt.min_version = SSL_MINOR_VERSION_3;
	opt.max_version = SSL_MINOR_VERSION_3;
	}
	else
	goto usage;
	}
	else if( strcmp( p, "auth_mode" ) == 0 )
	{
	if( strcmp( q, "none" ) == 0 )
	opt.auth_mode = SSL_VERIFY_NONE;
	else if( strcmp( q, "optional" ) == 0 )
	opt.auth_mode = SSL_VERIFY_OPTIONAL;
	else if( strcmp( q, "required" ) == 0 )
	opt.auth_mode = SSL_VERIFY_REQUIRED;
	else
	goto usage;
	}
	else
	goto usage;
	}

	if( opt.force_ciphersuite[0] > 0 )
	{
	const ssl_ciphersuite_t *ciphersuite_info;
	ciphersuite_info = ssl_ciphersuite_from_id( opt.force_ciphersuite[0] );

	if( ciphersuite_info->min_minor_ver > opt.max_version \|\|
	ciphersuite_info->max_minor_ver < opt.min_version )
	{
	printf("forced ciphersuite not allowed with this protocol version\n");
	ret = 2;
	goto usage;
	}
	}

	#if defined(POLARSSL_KEY_EXCHANGE_PSK_ENABLED)
	/*
	* Unhexify the pre-shared key if any is given
	*/
	if( strlen( opt.psk ) )
	{
	unsigned char c;
	size_t j;

	if( strlen( opt.psk ) % 2 != 0 )
	{
	printf("pre-shared key not valid hex\n");
	goto exit;
	}

	psk_len = strlen( opt.psk ) / 2;

	for( j = 0; j < strlen( opt.psk ); j += 2 )
	{
	c = opt.psk[j];
	if( c >= '0' && c <= '9' )
	c -= '0';
	else if( c >= 'a' && c <= 'f' )
	c -= 'a' - 10;
	else if( c >= 'A' && c <= 'F' )
	c -= 'A' - 10;
	else
	{
	printf("pre-shared key not valid hex\n");
	goto exit;
	}
	psk[ j / 2 ] = c << 4;

	c = opt.psk[j + 1];
	if( c >= '0' && c <= '9' )
	c -= '0';
	else if( c >= 'a' && c <= 'f' )
	c -= 'a' - 10;
	else if( c >= 'A' && c <= 'F' )
	c -= 'A' - 10;
	else
	{
	printf("pre-shared key not valid hex\n");
	goto exit;
	}
	psk[ j / 2 ] \|= c;
	}
	}
	#endif /* POLARSSL_KEY_EXCHANGE_PSK_ENABLED */

	/*
	* 0. Initialize the RNG and the session data
	*/
	printf( "\n . Seeding the random number generator..." );
	fflush( stdout );

	entropy_init( &entropy );
	if( ( ret = ctr_drbg_init( &ctr_drbg, entropy_func, &entropy,
	(const unsigned char *) pers,
	strlen( pers ) ) ) != 0 )
	{
	printf( " failed\n ! ctr_drbg_init returned -0x%x\n", -ret );
	goto exit;
	}

	printf( " ok\n" );

	#if defined(POLARSSL_X509_PARSE_C)
	/*
	* 1.1. Load the trusted CA
	*/
	printf( " . Loading the CA root certificate ..." );
	fflush( stdout );

	#if defined(POLARSSL_FS_IO)
	if( strlen( opt.ca_path ) )
	ret = x509parse_crtpath( &cacert, opt.ca_path );
	else if( strlen( opt.ca_file ) )
	ret = x509parse_crtfile( &cacert, opt.ca_file );
	else
	#endif
	#if defined(POLARSSL_CERTS_C)
	ret = x509parse_crt( &cacert, (const unsigned char *) test_ca_crt,
	strlen( test_ca_crt ) );
	#else
	{
	ret = 1;
	printf("POLARSSL_CERTS_C not defined.");
	}
	#endif
	if( ret < 0 )
	{
	printf( " failed\n ! x509parse_crt returned -0x%x\n\n", -ret );
	goto exit;
	}

	printf( " ok (%d skipped)\n", ret );

	/*
	* 1.2. Load own certificate and private key
	*/
	printf( " . Loading the server cert. and key..." );
	fflush( stdout );

	#if defined(POLARSSL_FS_IO)
	if( strlen( opt.crt_file ) )
	ret = x509parse_crtfile( &srvcert, opt.crt_file );
	else
	#endif
	#if defined(POLARSSL_CERTS_C)
	ret = x509parse_crt( &srvcert, (const unsigned char *) test_srv_crt,
	strlen( test_srv_crt ) );
	#else
	{
	ret = 1;
	printf("POLARSSL_CERTS_C not defined.");
	}
	#endif
	if( ret != 0 )
	{
	printf( " failed\n ! x509parse_crt returned -0x%x\n\n", -ret );
	goto exit;
	}

	#if defined(POLARSSL_FS_IO)
	if( strlen( opt.key_file ) )
	ret = x509parse_keyfile( &rsa, opt.key_file, "" );
	else
	#endif
	#if defined(POLARSSL_CERTS_C)
	ret = x509parse_key( &rsa, (const unsigned char *) test_srv_key,
	strlen( test_srv_key ), NULL, 0 );
	#else
	{
	ret = 1;
	printf("POLARSSL_CERTS_C not defined.");
	}
	#endif
	if( ret != 0 )
	{
	printf( " failed\n ! x509parse_key returned -0x%x\n\n", -ret );
	goto exit;
	}

	printf( " ok\n" );
	#endif /* POLARSSL_X509_PARSE_C */

	/*
	* 2. Setup the listening TCP socket
	*/
	printf( " . Bind on tcp://localhost:%-4d/ ...", opt.server_port );
	fflush( stdout );

	if( ( ret = net_bind( &listen_fd, NULL, opt.server_port ) ) != 0 )
	{
	printf( " failed\n ! net_bind returned -0x%x\n\n", -ret );
	goto exit;
	}

	printf( " ok\n" );

	/*
	* 3. Setup stuff
	*/
	printf( " . Setting up the SSL/TLS structure..." );
	fflush( stdout );

	if( ( ret = ssl_init( &ssl ) ) != 0 )
	{
	printf( " failed\n ! ssl_init returned -0x%x\n\n", -ret );
	goto exit;
	}

	ssl_set_endpoint( &ssl, SSL_IS_SERVER );
	ssl_set_authmode( &ssl, opt.auth_mode );

	ssl_set_rng( &ssl, ctr_drbg_random, &ctr_drbg );
	ssl_set_dbg( &ssl, my_debug, stdout );

	#if defined(POLARSSL_SSL_CACHE_C)
	ssl_set_session_cache( &ssl, ssl_cache_get, &cache,
	ssl_cache_set, &cache );
	#endif

	if( opt.force_ciphersuite[0] != DFL_FORCE_CIPHER )
	ssl_set_ciphersuites( &ssl, opt.force_ciphersuite );

	ssl_set_renegotiation( &ssl, opt.renegotiation );
	ssl_legacy_renegotiation( &ssl, opt.allow_legacy );

	#if defined(POLARSSL_X509_PARSE_C)
	ssl_set_ca_chain( &ssl, &cacert, NULL, NULL );
	ssl_set_own_cert( &ssl, &srvcert, &rsa );
	#endif

	#if defined(POLARSSL_KEY_EXCHANGE_PSK_ENABLED)
	ssl_set_psk( &ssl, psk, psk_len, (const unsigned char *) opt.psk_identity,
	strlen( opt.psk_identity ) );
	#endif

	#if defined(POLARSSL_DHM_C)
	/*
	* Use different group than default DHM group
	*/
	ssl_set_dh_param( &ssl, POLARSSL_DHM_RFC5114_MODP_2048_P,
	POLARSSL_DHM_RFC5114_MODP_2048_G );
	#endif

	if( opt.min_version != -1 )
	ssl_set_min_version( &ssl, SSL_MAJOR_VERSION_3, opt.min_version );

	if( opt.max_version != -1 )
	ssl_set_max_version( &ssl, SSL_MAJOR_VERSION_3, opt.max_version );

	printf( " ok\n" );

	reset:
	#ifdef POLARSSL_ERROR_C
	if( ret != 0 )
	{
	char error_buf[100];
	polarssl_strerror( ret, error_buf, 100 );
	printf("Last error was: %d - %s\n\n", ret, error_buf );
	}
	#endif

	if( client_fd != -1 )
	net_close( client_fd );

	ssl_session_reset( &ssl );

	/*
	* 3. Wait until a client connects
	*/
	#if defined(_WIN32_WCE)
	{
	SHELLEXECUTEINFO sei;

	ZeroMemory( &sei, sizeof( SHELLEXECUTEINFO ) );

	sei.cbSize = sizeof( SHELLEXECUTEINFO );
	sei.fMask = 0;
	sei.hwnd = 0;
	sei.lpVerb = _T( "open" );
	sei.lpFile = _T( "https://localhost:4433/" );
	sei.lpParameters = NULL;
	sei.lpDirectory = NULL;
	sei.nShow = SW_SHOWNORMAL;

	ShellExecuteEx( &sei );
	}
	#elif defined(_WIN32)
	ShellExecute( NULL, "open", "https://localhost:4433/",
	NULL, NULL, SW_SHOWNORMAL );
	#endif

	client_fd = -1;

	printf( " . Waiting for a remote connection ..." );
	fflush( stdout );

	if( ( ret = net_accept( listen_fd, &client_fd, NULL ) ) != 0 )
	{
	printf( " failed\n ! net_accept returned -0x%x\n\n", -ret );
	goto exit;
	}

	ssl_set_bio( &ssl, net_recv, &client_fd,
	net_send, &client_fd );

	printf( " ok\n" );

	/*
	* 4. Handshake
	*/
	printf( " . Performing the SSL/TLS handshake..." );
	fflush( stdout );

	while( ( ret = ssl_handshake( &ssl ) ) != 0 )
	{
	if( ret != POLARSSL_ERR_NET_WANT_READ && ret != POLARSSL_ERR_NET_WANT_WRITE )
	{
	printf( " failed\n ! ssl_handshake returned -0x%x\n\n", -ret );
	goto reset;
	}
	}

	printf( " ok\n [ Ciphersuite is %s ]\n",
	ssl_get_ciphersuite( &ssl ) );

	#if defined(POLARSSL_X509_PARSE_C)
	/*
	* 5. Verify the server certificate
	*/
	printf( " . Verifying peer X.509 certificate..." );

	if( ( ret = ssl_get_verify_result( &ssl ) ) != 0 )
	{
	printf( " failed\n" );

	if( !ssl_get_peer_cert( &ssl ) )
	printf( " ! no client certificate sent\n" );

	if( ( ret & BADCERT_EXPIRED ) != 0 )
	printf( " ! client certificate has expired\n" );

	if( ( ret & BADCERT_REVOKED ) != 0 )
	printf( " ! client certificate has been revoked\n" );

	if( ( ret & BADCERT_NOT_TRUSTED ) != 0 )
	printf( " ! self-signed or not signed by a trusted CA\n" );

	printf( "\n" );
	}
	else
	printf( " ok\n" );

	if( ssl_get_peer_cert( &ssl ) )
	{
	printf( " . Peer certificate information ...\n" );
	x509parse_cert_info( (char *) buf, sizeof( buf ) - 1, " ",
	ssl_get_peer_cert( &ssl ) );
	printf( "%s\n", buf );
	}
	#endif /* POLARSSL_X509_PARSE_C */

	/*
	* 6. Read the HTTP Request
	*/
	printf( " < Read from client:" );
	fflush( stdout );

	do
	{
	len = sizeof( buf ) - 1;
	memset( buf, 0, sizeof( buf ) );
	ret = ssl_read( &ssl, buf, len );

	if( ret == POLARSSL_ERR_NET_WANT_READ \|\| ret == POLARSSL_ERR_NET_WANT_WRITE )
	continue;

	if( ret <= 0 )
	{
	switch( ret )
	{
	case POLARSSL_ERR_SSL_PEER_CLOSE_NOTIFY:
	printf( " connection was closed gracefully\n" );
	break;

	case POLARSSL_ERR_NET_CONN_RESET:
	printf( " connection was reset by peer\n" );
	break;

	default:
	printf( " ssl_read returned -0x%x\n", -ret );
	break;
	}

	break;
	}

	len = ret;
	printf( " %d bytes read\n\n%s", len, (char *) buf );

	if( ret > 0 )
	break;
	}
	while( 1 );

	/*
	* 7. Write the 200 Response
	*/
	printf( " > Write to client:" );
	fflush( stdout );

	len = sprintf( (char *) buf, HTTP_RESPONSE,
	ssl_get_ciphersuite( &ssl ) );

	while( ( ret = ssl_write( &ssl, buf, len ) ) <= 0 )
	{
	if( ret == POLARSSL_ERR_NET_CONN_RESET )
	{
	printf( " failed\n ! peer closed the connection\n\n" );
	goto reset;
	}

	if( ret != POLARSSL_ERR_NET_WANT_READ && ret != POLARSSL_ERR_NET_WANT_WRITE )
	{
	printf( " failed\n ! ssl_write returned %d\n\n", ret );
	goto exit;
	}
	}

	len = ret;
	printf( " %d bytes written\n\n%s\n", len, (char *) buf );

	ret = 0;
	goto reset;

	exit:

	#ifdef POLARSSL_ERROR_C
	if( ret != 0 )
	{
	char error_buf[100];
	polarssl_strerror( ret, error_buf, 100 );
	printf("Last error was: -0x%X - %s\n\n", -ret, error_buf );
	}
	#endif

	net_close( client_fd );
	#if defined(POLARSSL_X509_PARSE_C)
	x509_free( &srvcert );
	x509_free( &cacert );
	rsa_free( &rsa );
	#endif

	ssl_free( &ssl );

	#if defined(POLARSSL_SSL_CACHE_C)
	ssl_cache_free( &cache );
	#endif

	#if defined(_WIN32)
	printf( " + Press Enter to exit this program.\n" );
	fflush( stdout ); getchar();
	#endif

	return( ret );
	}
	#endif /* POLARSSL_BIGNUM_C && POLARSSL_ENTROPY_C && POLARSSL_SSL_TLS_C &&
	POLARSSL_SSL_SRV_C && POLARSSL_NET_C && POLARSSL_RSA_C &&
	POLARSSL_CTR_DRBG_C */