programs/ssl/ssl_client2.c - security/mbedtls - Rivoreo Source Code Repositories

 /*
  *  SSL client with certificate authentication
  *
  *  Copyright (C) 2006-2010, 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

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

 #include "polarssl/config.h"

 #include "polarssl/net.h"
 #include "polarssl/ssl.h"
 #include "polarssl/havege.h"
 #include "polarssl/certs.h"
 #include "polarssl/x509.h"

 #define DFL_SERVER_NAME         "localhost"
 #define DFL_SERVER_PORT         4433
 #define DFL_REQUEST_PAGE        "/"
 #define DFL_DEBUG_LEVEL         0
 #define DFL_CA_FILE             ""
 #define DFL_CRT_FILE            ""
 #define DFL_KEY_FILE            ""
 #define DFL_FORCE_CIPHER        0

 #define GET_REQUEST "GET %s HTTP/1.0\r\n\r\n"

 /*
  * global options
  */
 struct options
 {
     char *server_name;          /* hostname of the server (client only)     */
     int server_port;            /* port on which the ssl service runs       */
     int debug_level;            /* level of debugging                       */
     char *request_page;         /* page on server to request                */
     char *ca_file;              /* the file with the CA certificate(s)      */
     char *crt_file;             /* the file with the client certificate     */
     char *key_file;             /* the file with the client key             */
     int force_ciphersuite[2];   /* protocol/ciphersuite to use, or all      */
 } opt;

 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_FS_IO)
 #define USAGE_IO \
     "    ca_file=%%s          default: \"\" (pre-loaded)\n" \
     "    crt_file=%%s         default: \"\" (pre-loaded)\n" \
     "    key_file=%%s         default: \"\" (pre-loaded)\n"
 #else
 #define USAGE_IO \
     "    No file operations available (POLARSSL_FS_IO not defined)\n"
 #endif /* POLARSSL_FS_IO */

 #define USAGE \
     "\n usage: ssl_client2 param=<>...\n"                   \
     "\n acceptable parameters:\n"                           \
     "    server_name=%%s      default: localhost\n"         \
     "    server_port=%%d      default: 4433\n"              \
     "    debug_level=%%d      default: 0 (disabled)\n"      \
     USAGE_IO                                                \
     "    request_page=%%s     default: \".\"\n"             \
     "    force_ciphersuite=<name>    default: all enabled\n"\
     " acceptable ciphersuite names:\n"

 #if !defined(POLARSSL_BIGNUM_C) || !defined(POLARSSL_HAVEGE_C) ||   \
     !defined(POLARSSL_SSL_TLS_C) || !defined(POLARSSL_SSL_CLI_C) || \
     !defined(POLARSSL_NET_C) || !defined(POLARSSL_RSA_C)
 int main( void )
 {
     printf("POLARSSL_BIGNUM_C and/or POLARSSL_HAVEGE_C and/or "
            "POLARSSL_SSL_TLS_C and/or POLARSSL_SSL_CLI_C and/or "
            "POLARSSL_NET_C and/or POLARSSL_RSA_C not defined.\n");
     return( 0 );
 }
 #else
 int main( int argc, char *argv[] )
 {
     int ret = 0, len, server_fd;
     unsigned char buf[1024];
     havege_state hs;
     ssl_context ssl;
     ssl_session ssn;
     x509_cert cacert;
     x509_cert clicert;
     rsa_context rsa;
     int i;
     size_t j, n;
     char *p, *q;
     const int *list;

     /*
      * Make sure memory references are valid.
      */
     server_fd = 0;
     memset( &ssn, 0, sizeof( ssl_session ) );
     memset( &ssl, 0, sizeof( ssl_context ) );
     memset( &cacert, 0, sizeof( x509_cert ) );
     memset( &clicert, 0, sizeof( x509_cert ) );
     memset( &rsa, 0, sizeof( rsa_context ) );

     if( argc == 0 )
     {
     usage:
         printf( USAGE );

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

     opt.server_name         = DFL_SERVER_NAME;
     opt.server_port         = DFL_SERVER_PORT;
     opt.debug_level         = DFL_DEBUG_LEVEL;
     opt.request_page        = DFL_REQUEST_PAGE;
     opt.ca_file             = DFL_CA_FILE;
     opt.crt_file            = DFL_CRT_FILE;
     opt.key_file            = DFL_KEY_FILE;
     opt.force_ciphersuite[0]= DFL_FORCE_CIPHER;

     for( i = 1; i < argc; i++ )
     {
         n = strlen( argv[i] );

         for( j = 0; j < n; j++ )
         {
             if( argv[i][j] >= 'A' && argv[i][j] <= 'Z' )
                 argv[i][j] |= 0x20;
         }

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

         if( strcmp( p, "server_name" ) == 0 )
             opt.server_name = q;
         else 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, "request_page" ) == 0 )
             opt.request_page = q;
         else if( strcmp( p, "ca_file" ) == 0 )
             opt.ca_file = 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, "force_ciphersuite" ) == 0 )
         {
             opt.force_ciphersuite[0] = -1;

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

             if( opt.force_ciphersuite[0] <= 0 )
                 goto usage;

             opt.force_ciphersuite[1] = 0;
         }
         else
             goto usage;
     }

     /*
      * 0. Initialize the RNG and the session data
      */
     havege_init( &hs );

     /*
      * 1.1. Load the trusted CA
      */
     printf( "\n  . Loading the CA root certificate ..." );
     fflush( stdout );

 #if defined(POLARSSL_FS_IO)
     if( strlen( opt.ca_file ) )
         ret = x509parse_crtfile( &cacert, opt.ca_file );
     else
 #endif
 #if defined(POLARSSL_CERTS_C)
         ret = x509parse_crt( &cacert, (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 %d\n\n", ret );
         goto exit;
     }

     printf( " ok\n" );

     /*
      * 1.2. Load own certificate and private key
      *
      * (can be skipped if client authentication is not required)
      */
     printf( "  . Loading the client cert. and key..." );
     fflush( stdout );

 #if defined(POLARSSL_FS_IO)
     if( strlen( opt.crt_file ) )
         ret = x509parse_crtfile( &clicert, opt.crt_file );
     else
 #endif
 #if defined(POLARSSL_CERTS_C)
         ret = x509parse_crt( &clicert, (unsigned char *) test_cli_crt,
                 strlen( test_cli_crt ) );
 #else
     {
         ret = 1;
         printf("POLARSSL_CERTS_C not defined.");
     }
 #endif
     if( ret != 0 )
     {
         printf( " failed\n  !  x509parse_crt returned %d\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, (unsigned char *) test_cli_key,
                 strlen( test_cli_key ), NULL, 0 );
 #else
     {
         ret = 1;
         printf("POLARSSL_CERTS_C not defined.");
     }
 #endif
     if( ret != 0 )
     {
         printf( " failed\n  !  x509parse_key returned %d\n\n", ret );
         goto exit;
     }

     printf( " ok\n" );

     /*
      * 2. Start the connection
      */
     printf( "  . Connecting to tcp/%s/%-4d...", opt.server_name,
                                                 opt.server_port );
     fflush( stdout );

     if( ( ret = net_connect( &server_fd, opt.server_name,
                                          opt.server_port ) ) != 0 )
     {
         printf( " failed\n  ! net_connect returned %d\n\n", ret );
         goto exit;
     }

     printf( " ok\n" );

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

     havege_init( &hs );

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

     printf( " ok\n" );

     ssl_set_endpoint( &ssl, SSL_IS_CLIENT );
     ssl_set_authmode( &ssl, SSL_VERIFY_OPTIONAL );

     ssl_set_rng( &ssl, havege_rand, &hs );
     ssl_set_dbg( &ssl, my_debug, stdout );
     ssl_set_bio( &ssl, net_recv, &server_fd,
                        net_send, &server_fd );

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

     ssl_set_session( &ssl, 1, 600, &ssn );

     ssl_set_ca_chain( &ssl, &cacert, NULL, opt.server_name );
     ssl_set_own_cert( &ssl, &clicert, &rsa );

     ssl_set_hostname( &ssl, opt.server_name );

     /*
      * 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 %d\n\n", ret );
             goto exit;
         }
     }

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

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

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

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

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

         if( ( ret & BADCERT_CN_MISMATCH ) != 0 )
             printf( "  ! CN mismatch (expected CN=%s)\n", opt.server_name );

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

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

     printf( "  . Peer certificate information    ...\n" );
     x509parse_cert_info( (char *) buf, sizeof( buf ) - 1, "      ", ssl.peer_cert );
     printf( "%s\n", buf );

     /*
      * 6. Write the GET request
      */
     printf( "  > Write to server:" );
     fflush( stdout );

     len = sprintf( (char *) buf, GET_REQUEST, opt.request_page );

     while( ( ret = ssl_write( &ssl, buf, len ) ) <= 0 )
     {
         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", len, (char *) buf );

     /*
      * 7. Read the HTTP response
      */
     printf( "  < Read from server:" );
     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 == POLARSSL_ERR_SSL_PEER_CLOSE_NOTIFY )
             break;

         if( ret < 0 )
         {
             printf( "failed\n  ! ssl_read returned %d\n\n", ret );
             break;
         }

         if( ret == 0 )
         {
             printf("\n\nEOF\n\n");
             break;
         }

         len = ret;
         printf( " %d bytes read\n\n%s", len, (char *) buf );
     }
     while( 1 );

     ssl_close_notify( &ssl );

 exit:

     if( server_fd )
         net_close( server_fd );
     x509_free( &clicert );
     x509_free( &cacert );
     rsa_free( &rsa );
     ssl_free( &ssl );

     memset( &ssl, 0, sizeof( ssl ) );

 #ifdef WIN32
     printf( "  + Press Enter to exit this program.\n" );
     fflush( stdout ); getchar();
 #endif

     return( ret );
 }
 #endif /* POLARSSL_BIGNUM_C && POLARSSL_HAVEGE_C && POLARSSL_SSL_TLS_C &&
           POLARSSL_SSL_CLI_C && POLARSSL_NET_C && POLARSSL_RSA_C */
	/*
	* SSL client with certificate authentication
	*
	* Copyright (C) 2006-2010, 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

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

	#include "polarssl/config.h"

	#include "polarssl/net.h"
	#include "polarssl/ssl.h"
	#include "polarssl/havege.h"
	#include "polarssl/certs.h"
	#include "polarssl/x509.h"

	#define DFL_SERVER_NAME "localhost"
	#define DFL_SERVER_PORT 4433
	#define DFL_REQUEST_PAGE "/"
	#define DFL_DEBUG_LEVEL 0
	#define DFL_CA_FILE ""
	#define DFL_CRT_FILE ""
	#define DFL_KEY_FILE ""
	#define DFL_FORCE_CIPHER 0

	#define GET_REQUEST "GET %s HTTP/1.0\r\n\r\n"

	/*
	* global options
	*/
	struct options
	{
	char server_name; / hostname of the server (client only) */
	int server_port; /* port on which the ssl service runs */
	int debug_level; /* level of debugging */
	char request_page; / page on server to request */
	char ca_file; / the file with the CA certificate(s) */
	char crt_file; / the file with the client certificate */
	char key_file; / the file with the client key */
	int force_ciphersuite[2]; /* protocol/ciphersuite to use, or all */
	} opt;

	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_FS_IO)
	#define USAGE_IO \
	" ca_file=%%s default: \"\" (pre-loaded)\n" \
	" crt_file=%%s default: \"\" (pre-loaded)\n" \
	" key_file=%%s default: \"\" (pre-loaded)\n"
	#else
	#define USAGE_IO \
	" No file operations available (POLARSSL_FS_IO not defined)\n"
	#endif /* POLARSSL_FS_IO */

	#define USAGE \
	"\n usage: ssl_client2 param=<>...\n" \
	"\n acceptable parameters:\n" \
	" server_name=%%s default: localhost\n" \
	" server_port=%%d default: 4433\n" \
	" debug_level=%%d default: 0 (disabled)\n" \
	USAGE_IO \
	" request_page=%%s default: \".\"\n" \
	" force_ciphersuite=<name> default: all enabled\n"\
	" acceptable ciphersuite names:\n"

	#if !defined(POLARSSL_BIGNUM_C) \|\| !defined(POLARSSL_HAVEGE_C) \|\| \
	!defined(POLARSSL_SSL_TLS_C) \|\| !defined(POLARSSL_SSL_CLI_C) \|\| \
	!defined(POLARSSL_NET_C) \|\| !defined(POLARSSL_RSA_C)
	int main( void )
	{
	printf("POLARSSL_BIGNUM_C and/or POLARSSL_HAVEGE_C and/or "
	"POLARSSL_SSL_TLS_C and/or POLARSSL_SSL_CLI_C and/or "
	"POLARSSL_NET_C and/or POLARSSL_RSA_C not defined.\n");
	return( 0 );
	}
	#else
	int main( int argc, char *argv[] )
	{
	int ret = 0, len, server_fd;
	unsigned char buf[1024];
	havege_state hs;
	ssl_context ssl;
	ssl_session ssn;
	x509_cert cacert;
	x509_cert clicert;
	rsa_context rsa;
	int i;
	size_t j, n;
	char p, q;
	const int *list;

	/*
	* Make sure memory references are valid.
	*/
	server_fd = 0;
	memset( &ssn, 0, sizeof( ssl_session ) );
	memset( &ssl, 0, sizeof( ssl_context ) );
	memset( &cacert, 0, sizeof( x509_cert ) );
	memset( &clicert, 0, sizeof( x509_cert ) );
	memset( &rsa, 0, sizeof( rsa_context ) );

	if( argc == 0 )
	{
	usage:
	printf( USAGE );

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

	opt.server_name = DFL_SERVER_NAME;
	opt.server_port = DFL_SERVER_PORT;
	opt.debug_level = DFL_DEBUG_LEVEL;
	opt.request_page = DFL_REQUEST_PAGE;
	opt.ca_file = DFL_CA_FILE;
	opt.crt_file = DFL_CRT_FILE;
	opt.key_file = DFL_KEY_FILE;
	opt.force_ciphersuite[0]= DFL_FORCE_CIPHER;

	for( i = 1; i < argc; i++ )
	{
	n = strlen( argv[i] );

	for( j = 0; j < n; j++ )
	{
	if( argv[i][j] >= 'A' && argv[i][j] <= 'Z' )
	argv[i][j] \|= 0x20;
	}

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

	if( strcmp( p, "server_name" ) == 0 )
	opt.server_name = q;
	else 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, "request_page" ) == 0 )
	opt.request_page = q;
	else if( strcmp( p, "ca_file" ) == 0 )
	opt.ca_file = 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, "force_ciphersuite" ) == 0 )
	{
	opt.force_ciphersuite[0] = -1;

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

	if( opt.force_ciphersuite[0] <= 0 )
	goto usage;

	opt.force_ciphersuite[1] = 0;
	}
	else
	goto usage;
	}

	/*
	* 0. Initialize the RNG and the session data
	*/
	havege_init( &hs );

	/*
	* 1.1. Load the trusted CA
	*/
	printf( "\n . Loading the CA root certificate ..." );
	fflush( stdout );

	#if defined(POLARSSL_FS_IO)
	if( strlen( opt.ca_file ) )
	ret = x509parse_crtfile( &cacert, opt.ca_file );
	else
	#endif
	#if defined(POLARSSL_CERTS_C)
	ret = x509parse_crt( &cacert, (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 %d\n\n", ret );
	goto exit;
	}

	printf( " ok\n" );

	/*
	* 1.2. Load own certificate and private key
	*
	* (can be skipped if client authentication is not required)
	*/
	printf( " . Loading the client cert. and key..." );
	fflush( stdout );

	#if defined(POLARSSL_FS_IO)
	if( strlen( opt.crt_file ) )
	ret = x509parse_crtfile( &clicert, opt.crt_file );
	else
	#endif
	#if defined(POLARSSL_CERTS_C)
	ret = x509parse_crt( &clicert, (unsigned char *) test_cli_crt,
	strlen( test_cli_crt ) );
	#else
	{
	ret = 1;
	printf("POLARSSL_CERTS_C not defined.");
	}
	#endif
	if( ret != 0 )
	{
	printf( " failed\n ! x509parse_crt returned %d\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, (unsigned char *) test_cli_key,
	strlen( test_cli_key ), NULL, 0 );
	#else
	{
	ret = 1;
	printf("POLARSSL_CERTS_C not defined.");
	}
	#endif
	if( ret != 0 )
	{
	printf( " failed\n ! x509parse_key returned %d\n\n", ret );
	goto exit;
	}

	printf( " ok\n" );

	/*
	* 2. Start the connection
	*/
	printf( " . Connecting to tcp/%s/%-4d...", opt.server_name,
	opt.server_port );
	fflush( stdout );

	if( ( ret = net_connect( &server_fd, opt.server_name,
	opt.server_port ) ) != 0 )
	{
	printf( " failed\n ! net_connect returned %d\n\n", ret );
	goto exit;
	}

	printf( " ok\n" );

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

	havege_init( &hs );

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

	printf( " ok\n" );

	ssl_set_endpoint( &ssl, SSL_IS_CLIENT );
	ssl_set_authmode( &ssl, SSL_VERIFY_OPTIONAL );

	ssl_set_rng( &ssl, havege_rand, &hs );
	ssl_set_dbg( &ssl, my_debug, stdout );
	ssl_set_bio( &ssl, net_recv, &server_fd,
	net_send, &server_fd );

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

	ssl_set_session( &ssl, 1, 600, &ssn );

	ssl_set_ca_chain( &ssl, &cacert, NULL, opt.server_name );
	ssl_set_own_cert( &ssl, &clicert, &rsa );

	ssl_set_hostname( &ssl, opt.server_name );

	/*
	* 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 %d\n\n", ret );
	goto exit;
	}
	}

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

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

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

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

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

	if( ( ret & BADCERT_CN_MISMATCH ) != 0 )
	printf( " ! CN mismatch (expected CN=%s)\n", opt.server_name );

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

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

	printf( " . Peer certificate information ...\n" );
	x509parse_cert_info( (char *) buf, sizeof( buf ) - 1, " ", ssl.peer_cert );
	printf( "%s\n", buf );

	/*
	* 6. Write the GET request
	*/
	printf( " > Write to server:" );
	fflush( stdout );

	len = sprintf( (char *) buf, GET_REQUEST, opt.request_page );

	while( ( ret = ssl_write( &ssl, buf, len ) ) <= 0 )
	{
	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", len, (char *) buf );

	/*
	* 7. Read the HTTP response
	*/
	printf( " < Read from server:" );
	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 == POLARSSL_ERR_SSL_PEER_CLOSE_NOTIFY )
	break;

	if( ret < 0 )
	{
	printf( "failed\n ! ssl_read returned %d\n\n", ret );
	break;
	}

	if( ret == 0 )
	{
	printf("\n\nEOF\n\n");
	break;
	}

	len = ret;
	printf( " %d bytes read\n\n%s", len, (char *) buf );
	}
	while( 1 );

	ssl_close_notify( &ssl );

	exit:

	if( server_fd )
	net_close( server_fd );
	x509_free( &clicert );
	x509_free( &cacert );
	rsa_free( &rsa );
	ssl_free( &ssl );

	memset( &ssl, 0, sizeof( ssl ) );

	#ifdef WIN32
	printf( " + Press Enter to exit this program.\n" );
	fflush( stdout ); getchar();
	#endif

	return( ret );
	}
	#endif /* POLARSSL_BIGNUM_C && POLARSSL_HAVEGE_C && POLARSSL_SSL_TLS_C &&
	POLARSSL_SSL_CLI_C && POLARSSL_NET_C && POLARSSL_RSA_C */