/* crypto/bio/bss_rtcp.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.]

 */

/* Written by David L. Jones <jonesd@kcgl1.eng.ohio-state.edu>

 * Date:   22-JUL-1996

 * Revised: 25-SEP-1997		Update for 0.8.1, BIO_CTRL_SET -> BIO_C_SET_FD

 */

/* VMS */

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <errno.h>

#include "cryptlib.h"

#include <openssl/bio.h>

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

#include <starlet.h>

typedef unsigned short io_channel;

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

struct io_status { short status, count; long flags; };

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)

struct rpc_ctx {

    int filled, pos;

    struct rpc_msg msg;

};

static int rtcp_write(BIO *h,const char *buf,int num);

static int rtcp_read(BIO *h,char *buf,int size);

static int rtcp_puts(BIO *h,const char *str);

static int rtcp_gets(BIO *h,char *str,int size);

static long rtcp_ctrl(BIO *h,int cmd,long arg1,void *arg2);

static int rtcp_new(BIO *h);

static int rtcp_free(BIO *data);

static BIO_METHOD rtcp_method=

	{

	BIO_TYPE_FD,

	"RTCP",

	rtcp_write,

	rtcp_read,

	rtcp_puts,

	rtcp_gets,

	rtcp_ctrl,

	rtcp_new,

	rtcp_free,

	NULL,

	};

BIO_METHOD *BIO_s_rtcp(void)

	{

	return(&rtcp_method);

	}

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

/* Decnet I/O routines.

 */

#ifdef __DECC

#pragma message save

#pragma message disable DOLLARID

#endif

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;

}

#ifdef __DECC

#pragma message restore

#endif

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

static int rtcp_new(BIO *bi)

{

    struct rpc_ctx *ctx;

	bi->init=1;

	bi->num=0;

	bi->flags = 0;

	bi->ptr=OPENSSL_malloc(sizeof(struct rpc_ctx));

	ctx = (struct rpc_ctx *) bi->ptr;

	ctx->filled = 0;

	ctx->pos = 0;

	return(1);

}

static int rtcp_free(BIO *a)

{

	if (a == NULL) return(0);

	if ( a->ptr ) OPENSSL_free ( a->ptr );

	a->ptr = NULL;

	return(1);

}

static int rtcp_read(BIO *b, char *out, int outl)

{

    int status, length;

    struct rpc_ctx *ctx;

    /*

     * read data, return existing.

     */

    ctx = (struct rpc_ctx *) b->ptr;

    if ( ctx->pos < ctx->filled ) {

	length = ctx->filled - ctx->pos;

	if ( length > outl ) length = outl;

	memmove ( out, &ctx->msg.data[ctx->pos], length );

	ctx->pos += length;

	return length;

    }

    /*

     * Requst more data from R channel.

     */

    ctx->msg.channel = 'R';

    ctx->msg.function = 'G';

    ctx->msg.length = sizeof(ctx->msg.data);

    status = put ( b->num, (char *) &ctx->msg, RPC_HDR_SIZE );

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

	return -1;

    }

    /*

     * Read.

     */

    ctx->pos = ctx->filled = 0;

    status = get ( b->num, (char *) &ctx->msg, sizeof(ctx->msg), &length );

    if ( (status&1) == 0 ) length = -1;

    if ( ctx->msg.channel != 'R' || ctx->msg.function != 'C' ) {

	length = -1;

    }

    ctx->filled = length - RPC_HDR_SIZE;

    if ( ctx->pos < ctx->filled ) {

	length = ctx->filled - ctx->pos;

	if ( length > outl ) length = outl;

	memmove ( out, ctx->msg.data, length );

	ctx->pos += length;

	return length;

    }

    return length;

}

static int rtcp_write(BIO *b, const char *in, int inl)

{

    int status, i, segment, length;

    struct rpc_ctx *ctx;

    /*

     * Output data, send in chunks no larger that sizeof(ctx->msg.data).

     */

    ctx = (struct rpc_ctx *) b->ptr;

    for ( i = 0; i < inl; i += segment ) {

	segment = inl - i;

	if ( segment > sizeof(ctx->msg.data) ) segment = sizeof(ctx->msg.data);

	ctx->msg.channel = 'R';

	ctx->msg.function = 'P';

	ctx->msg.length = segment;

	memmove ( ctx->msg.data, &in[i], segment );

	status = put ( b->num, (char *) &ctx->msg, segment + RPC_HDR_SIZE );

	if ((status&1) == 0 ) { i = -1; break; }

	status = get ( b->num, (char *) &ctx->msg, sizeof(ctx->msg), &length );

	if ( ((status&1) == 0) || (length < RPC_HDR_SIZE) ) { i = -1; break; }

	if ( (ctx->msg.channel != 'R') || (ctx->msg.function != 'C') ) {

	   printf("unexpected response when confirming put %c %c\n",

		ctx->msg.channel, ctx->msg.function );

	}

    }

    return(i);

}

static long rtcp_ctrl(BIO *b, int cmd, long num, void *ptr)

	{

	long ret=1;

	switch (cmd)

		{

	case BIO_CTRL_RESET:

	case BIO_CTRL_EOF:

		ret = 1;

		break;

	case BIO_C_SET_FD:

		b->num = num;

		ret = 1;

	 	break;

	case BIO_CTRL_SET_CLOSE:

	case BIO_CTRL_FLUSH:

	case BIO_CTRL_DUP:

		ret=1;

		break;

	case BIO_CTRL_GET_CLOSE:

	case BIO_CTRL_INFO:

	case BIO_CTRL_GET:

	case BIO_CTRL_PENDING:

	case BIO_CTRL_WPENDING:

	default:

		ret=0;

		break;

		}

	return(ret);

	}

static int rtcp_gets(BIO *bp, char *buf, int size)

	{

	return(0);

	}

static int rtcp_puts(BIO *bp, const char *str)

{

    int length;

    if (str == NULL) return(0);

    length = strlen ( str );

    if ( length == 0 ) return (0);

    return rtcp_write ( bp,str, length );

}