/* 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);
}