/* 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 );

 }