/* ssl/ssl_task.c */

/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)

 * All rights reserved.

 *

 * This package is an SSL implementation written

 * by Eric Young (eay@cryptsoft.com).

 * The implementation was written so as to conform with Netscapes SSL.

 * 

 * This library is free for commercial and non-commercial use as long as

 * the following conditions are aheared to.  The following conditions

 * apply to all code found in this distribution, be it the RC4, RSA,

 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation

 * included with this distribution is covered by the same copyright terms

 * except that the holder is Tim Hudson (tjh@cryptsoft.com).

 * 

 * Copyright remains Eric Young's, and as such any Copyright notices in

 * the code are not to be removed.

 * If this package is used in a product, Eric Young should be given attribution

 * as the author of the parts of the library used.

 * This can be in the form of a textual message at program startup or

 * in documentation (online or textual) provided with the package.

 * 

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. All advertising materials mentioning features or use of this software

 *    must display the following acknowledgement:

 *    "This product includes cryptographic software written by

 *     Eric Young (eay@cryptsoft.com)"

 *    The word 'cryptographic' can be left out if the rouines from the library

 *    being used are not cryptographic related :-).

 * 4. If you include any Windows specific code (or a derivative thereof) from 

 *    the apps directory (application code) you must include an acknowledgement:

 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"

 * 

 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 * 

 * The licence and distribution terms for any publically available version or

 * derivative of this code cannot be changed.  i.e. this code cannot simply be

 * copied and put under another distribution licence

 * [including the GNU Public Licence.]

 */

/* VMS */

/*

 * DECnet object for servicing SSL.  We accept the inbound and speak a

 * simple protocol for multiplexing the 2 data streams (application and

 * ssl data) over this logical link.

 *

 * Logical names:

 *    SSL_CIPHER	Defines a list of cipher specifications the server

 *			will support in order of preference.

 *    SSL_SERVER_CERTIFICATE

 *			Points to PEM (privacy enhanced mail) file that

 *			contains the server certificate and private password.

 *    SYS$NET		Logical created by netserver.exe as hook for completing

 *			DECnet logical link.

 *

 * Each NSP message sent over the DECnet link has the following structure:

 *    struct rpc_msg { 

 *      char channel;

 *      char function;

 *      short length;

 *      char data[MAX_DATA];

 *    } msg;

 *

 * The channel field designates the virtual data stream this message applies

 * to and is one of:

 *   A - Application data (payload).

 *   R - Remote client connection that initiated the SSL connection.  Encrypted

 *       data is sent over this connection.

 *   G - General data, reserved for future use.

 *

 * The data streams are half-duplex read/write and have following functions:

 *   G - Get, requests that up to msg.length bytes of data be returned.  The

 *       data is returned in the next 'C' function response that matches the

 *       requesting channel.

 *   P - Put, requests that the first msg.length bytes of msg.data be appended

 *       to the designated stream.

 *   C - Confirms a get or put.  Every get and put will get a confirm response,

 *       you cannot initiate another function on a channel until the previous

 *       operation has been confirmed.

 *

 *  The 2 channels may interleave their operations, for example:

 *        Server msg           Client msg

 *         A, Get, 4092          ---->

 *                               <----  R, get, 4092

 *         R, Confirm, {hello}   ---->

 *                               <----  R, put, {srv hello}

 *         R, Confirm, 0         ---->

 *                               .		(SSL handshake completed)

 *                               .              (read first app data).

 *                               <----  A, confirm, {http data}

 *         A, Put, {http data}   ---->

 *                               <----  A, confirm, 0

 *

 *  The length field is not permitted to be larger that 4092 bytes.

 *

 * Author: Dave Jones

 * Date:   22-JUL-1996

 */

#include <stdlib.h>

#include <stdio.h>

#include <iodef.h>		/* VMS IO$_ definitions */

#include <descrip.h>		/* VMS string descriptors */

extern int SYS$QIOW(), SYS$ASSIGN();

int LIB$INIT_TIMER(), LIB$SHOW_TIMER();

#include <string.h>		/* from ssltest.c */

#include <errno.h>

#include "e_os.h"

#include <openssl/buffer.h>

#include <openssl/x509.h>

#include <openssl/ssl.h>

#include <openssl/err.h>

int MS_CALLBACK verify_callback(int ok, X509 *xs, X509 *xi, int depth,

	int error);

BIO *bio_err=NULL;

BIO *bio_stdout=NULL;

BIO_METHOD *BIO_s_rtcp();

static char *cipher=NULL;

int verbose=1;

#ifdef FIONBIO

static int s_nbio=0;

#endif

#define TEST_SERVER_CERT "SSL_SERVER_CERTIFICATE"

/*************************************************************************/

struct rpc_msg {		/* Should have member alignment inhibited */

   char channel;		/* 'A'-app data. 'R'-remote client 'G'-global */

   char function;		/* 'G'-get, 'P'-put, 'C'-confirm, 'X'-close */

   unsigned short int length;	/* Amount of data returned or max to return */

   char data[4092];		/* variable data */

};

#define RPC_HDR_SIZE (sizeof(struct rpc_msg) - 4092)

static $DESCRIPTOR(sysnet, "SYS$NET");

typedef unsigned short io_channel;

struct io_status {

    unsigned short status;

    unsigned short count;

    unsigned long stsval;

};

int doit(io_channel chan, SSL_CTX *s_ctx );

/*****************************************************************************/

/* Decnet I/O routines.

 */

static int get ( io_channel chan, char *buffer, int maxlen, int *length )

{

    int status;

    struct io_status iosb;

    status = SYS$QIOW ( 0, chan, IO$_READVBLK, &iosb, 0, 0,

	buffer, maxlen, 0, 0, 0, 0 );

    if ( (status&1) == 1 ) status = iosb.status;

    if ( (status&1) == 1 ) *length = iosb.count;

    return status;

}

static int put ( io_channel chan, char *buffer, int length )

{

    int status;

    struct io_status iosb;

    status = SYS$QIOW ( 0, chan, IO$_WRITEVBLK, &iosb, 0, 0,

	buffer, length, 0, 0, 0, 0 );

    if ( (status&1) == 1 ) status = iosb.status;

    return status;

}

/***************************************************************************/

/* Handle operations on the 'G' channel.

 */

static int general_request ( io_channel chan, struct rpc_msg *msg, int length )

{

    return 48;

}

/***************************************************************************/

int main ( int argc, char **argv )

{

    int status, length;

    io_channel chan;

    struct rpc_msg msg;

	char *CApath=NULL,*CAfile=NULL;

	int badop=0;

	int ret=1;

	int client_auth=0;

	int server_auth=0;

	SSL_CTX *s_ctx=NULL;

    /*

     * Confirm logical link with initiating client.

     */

    LIB$INIT_TIMER();

    status = SYS$ASSIGN ( &sysnet, &chan, 0, 0, 0 );

    printf("status of assign to SYS$NET: %d\n", status );

    /*

     * Initialize standard out and error files.

     */

	if (bio_err == NULL)

		if ((bio_err=BIO_new(BIO_s_file())) != NULL)

			BIO_set_fp(bio_err,stderr,BIO_NOCLOSE);

	if (bio_stdout == NULL)

		if ((bio_stdout=BIO_new(BIO_s_file())) != NULL)

			BIO_set_fp(bio_stdout,stdout,BIO_NOCLOSE);

    /*

     * get the preferred cipher list and other initialization

     */

	if (cipher == NULL) cipher=getenv("SSL_CIPHER");

	printf("cipher list: %s\n", cipher ? cipher : "{undefined}" );

	SSL_load_error_strings();

	OpenSSL_add_all_algorithms();

/* DRM, this was the original, but there is no such thing as SSLv2()

	s_ctx=SSL_CTX_new(SSLv2());

*/

	s_ctx=SSL_CTX_new(SSLv2_server_method());

	if (s_ctx == NULL) goto end;

	SSL_CTX_use_certificate_file(s_ctx,TEST_SERVER_CERT,SSL_FILETYPE_PEM);

	SSL_CTX_use_RSAPrivateKey_file(s_ctx,TEST_SERVER_CERT,SSL_FILETYPE_PEM);

	printf("Loaded server certificate: '%s'\n", TEST_SERVER_CERT );

    /*

     * Take commands from client until bad status.

     */

    LIB$SHOW_TIMER();

    status = doit ( chan, s_ctx );

    LIB$SHOW_TIMER();

    /*

     * do final cleanup and exit.

     */

end:

	if (s_ctx != NULL) SSL_CTX_free(s_ctx);

    LIB$SHOW_TIMER();

    return 1;

}

int doit(io_channel chan, SSL_CTX *s_ctx )

{

    int status, length, link_state;

     struct rpc_msg msg;

	SSL *s_ssl=NULL;

	BIO *c_to_s=NULL;

	BIO *s_to_c=NULL;

	BIO *c_bio=NULL;

	BIO *s_bio=NULL;

	int i;

	int done=0;

	s_ssl=SSL_new(s_ctx);

	if (s_ssl == NULL) goto err;

	c_to_s=BIO_new(BIO_s_rtcp());

	s_to_c=BIO_new(BIO_s_rtcp());

	if ((s_to_c == NULL) || (c_to_s == NULL)) goto err;

/* original, DRM 24-SEP-1997

	BIO_set_fd ( c_to_s, "", chan );

	BIO_set_fd ( s_to_c, "", chan );

*/

	BIO_set_fd ( c_to_s, 0, chan );

	BIO_set_fd ( s_to_c, 0, chan );

	c_bio=BIO_new(BIO_f_ssl());

	s_bio=BIO_new(BIO_f_ssl());

	if ((c_bio == NULL) || (s_bio == NULL)) goto err;

	SSL_set_accept_state(s_ssl);

	SSL_set_bio(s_ssl,c_to_s,s_to_c);

	BIO_set_ssl(s_bio,s_ssl,BIO_CLOSE);

	/* We can always do writes */

	printf("Begin doit main loop\n");

	/*

	 * Link states: 0-idle, 1-read pending, 2-write pending, 3-closed.

	 */

	for (link_state = 0; link_state < 3; ) {

	    /*

	     * Wait for remote end to request data action on A channel.

	     */

	    while ( link_state == 0 ) {

		status = get ( chan, (char *) &msg, sizeof(msg), &length );

		if ( (status&1) == 0 ) {

		    printf("Error in main loop get: %d\n", status );

		    link_state = 3;

		    break;

		}

	   	if ( length < RPC_HDR_SIZE ) {

		    printf("Error in main loop get size: %d\n", length );

		    break;

		    link_state = 3;

		}

	   	if ( msg.channel != 'A' ) {

		    printf("Error in main loop, unexpected channel: %c\n", 

			msg.channel );

		    break;

		    link_state = 3;

		}

		if ( msg.function == 'G' ) {

		    link_state = 1;

		} else if ( msg.function == 'P' ) {

		    link_state = 2;	/* write pending */

		} else if ( msg.function == 'X' ) {

		    link_state = 3;

		} else {

		    link_state = 3;

		}

	    }

	    if ( link_state == 1 ) {

		i = BIO_read ( s_bio, msg.data, msg.length );

		if ( i < 0 ) link_state = 3;

		else {

		    msg.channel = 'A';

		    msg.function = 'C';		/* confirm */

		    msg.length = i;

		    status = put ( chan, (char *) &msg, i+RPC_HDR_SIZE );

		    if ( (status&1) == 0 ) break;

		    link_state = 0;

		}

	    } else if ( link_state == 2 ) {

		i = BIO_write ( s_bio, msg.data, msg.length );

		if ( i < 0 ) link_state = 3;

		else {

		    msg.channel = 'A';

		    msg.function = 'C';		/* confirm */

		    msg.length = 0;

		    status = put ( chan, (char *) &msg, RPC_HDR_SIZE );

		    if ( (status&1) == 0 ) break;

		    link_state = 0;

		}

	    }

	}

	fprintf(stdout,"DONE\n");

err:

	/* We have to set the BIO's to NULL otherwise they will be

	 * free()ed twice.  Once when th s_ssl is SSL_free()ed and

	 * again when c_ssl is SSL_free()ed.

	 * This is a hack required because s_ssl and c_ssl are sharing the same

	 * BIO structure and SSL_set_bio() and SSL_free() automatically

	 * BIO_free non NULL entries.

	 * You should not normally do this or be required to do this */

	s_ssl->rbio=NULL;

	s_ssl->wbio=NULL;

	if (c_to_s != NULL) BIO_free(c_to_s);

	if (s_to_c != NULL) BIO_free(s_to_c);

	if (c_bio != NULL) BIO_free(c_bio);

	if (s_bio != NULL) BIO_free(s_bio);

	return(0);

}