bss_rtcp.c revision 68651 
1/* crypto/bio/bss_rtcp.c */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to.  The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 *    notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 *    notice, this list of conditions and the following disclaimer in the
30 *    documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 *    must display the following acknowledgement:
33 *    "This product includes cryptographic software written by
34 *     Eric Young (eay@cryptsoft.com)"
35 *    The word 'cryptographic' can be left out if the rouines from the library
36 *    being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 *    the apps directory (application code) you must include an acknowledgement:
39 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed.  i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58
59/* Written by David L. Jones <jonesd@kcgl1.eng.ohio-state.edu>
60 * Date:   22-JUL-1996
61 * Revised: 25-SEP-1997		Update for 0.8.1, BIO_CTRL_SET -> BIO_C_SET_FD
62 */
63/* VMS */
64#include <stdio.h>
65#include <stdlib.h>
66#include <string.h>
67#include <errno.h>
68#include "cryptlib.h"
69#include <openssl/bio.h>
70
71#include <iodef.h>		/* VMS IO$_ definitions */
72#include <starlet.h>
73
74typedef unsigned short io_channel;
75/*************************************************************************/
76struct io_status { short status, count; long flags; };
77
78struct rpc_msg {		/* Should have member alignment inhibited */
79   char channel;		/* 'A'-app data. 'R'-remote client 'G'-global */
80   char function;		/* 'G'-get, 'P'-put, 'C'-confirm, 'X'-close */
81   unsigned short int length;	/* Amount of data returned or max to return */
82   char data[4092];		/* variable data */
83};
84#define RPC_HDR_SIZE (sizeof(struct rpc_msg) - 4092)
85
86struct rpc_ctx {
87    int filled, pos;
88    struct rpc_msg msg;
89};
90
91static int rtcp_write(BIO *h,const char *buf,int num);
92static int rtcp_read(BIO *h,char *buf,int size);
93static int rtcp_puts(BIO *h,const char *str);
94static int rtcp_gets(BIO *h,char *str,int size);
95static long rtcp_ctrl(BIO *h,int cmd,long arg1,void *arg2);
96static int rtcp_new(BIO *h);
97static int rtcp_free(BIO *data);
98
99static BIO_METHOD rtcp_method=
100	{
101	BIO_TYPE_FD,
102	"RTCP",
103	rtcp_write,
104	rtcp_read,
105	rtcp_puts,
106	rtcp_gets,
107	rtcp_ctrl,
108	rtcp_new,
109	rtcp_free,
110	NULL,
111	};
112
113BIO_METHOD *BIO_s_rtcp(void)
114	{
115	return(&rtcp_method);
116	}
117/*****************************************************************************/
118/* Decnet I/O routines.
119 */
120
121#ifdef __DECC
122#pragma message save
123#pragma message disable DOLLARID
124#endif
125
126static int get ( io_channel chan, char *buffer, int maxlen, int *length )
127{
128    int status;
129    struct io_status iosb;
130    status = sys$qiow ( 0, chan, IO$_READVBLK, &iosb, 0, 0,
131	buffer, maxlen, 0, 0, 0, 0 );
132    if ( (status&1) == 1 ) status = iosb.status;
133    if ( (status&1) == 1 ) *length = iosb.count;
134    return status;
135}
136
137static int put ( io_channel chan, char *buffer, int length )
138{
139    int status;
140    struct io_status iosb;
141    status = sys$qiow ( 0, chan, IO$_WRITEVBLK, &iosb, 0, 0,
142	buffer, length, 0, 0, 0, 0 );
143    if ( (status&1) == 1 ) status = iosb.status;
144    return status;
145}
146
147#ifdef __DECC
148#pragma message restore
149#endif
150
151/***************************************************************************/
152
153static int rtcp_new(BIO *bi)
154{
155    struct rpc_ctx *ctx;
156	bi->init=1;
157	bi->num=0;
158	bi->flags = 0;
159	bi->ptr=OPENSSL_malloc(sizeof(struct rpc_ctx));
160	ctx = (struct rpc_ctx *) bi->ptr;
161	ctx->filled = 0;
162	ctx->pos = 0;
163	return(1);
164}
165
166static int rtcp_free(BIO *a)
167{
168	if (a == NULL) return(0);
169	if ( a->ptr ) OPENSSL_free ( a->ptr );
170	a->ptr = NULL;
171	return(1);
172}
173
174static int rtcp_read(BIO *b, char *out, int outl)
175{
176    int status, length;
177    struct rpc_ctx *ctx;
178    /*
179     * read data, return existing.
180     */
181    ctx = (struct rpc_ctx *) b->ptr;
182    if ( ctx->pos < ctx->filled ) {
183	length = ctx->filled - ctx->pos;
184	if ( length > outl ) length = outl;
185	memmove ( out, &ctx->msg.data[ctx->pos], length );
186	ctx->pos += length;
187	return length;
188    }
189    /*
190     * Requst more data from R channel.
191     */
192    ctx->msg.channel = 'R';
193    ctx->msg.function = 'G';
194    ctx->msg.length = sizeof(ctx->msg.data);
195    status = put ( b->num, (char *) &ctx->msg, RPC_HDR_SIZE );
196    if ( (status&1) == 0 ) {
197	return -1;
198    }
199    /*
200     * Read.
201     */
202    ctx->pos = ctx->filled = 0;
203    status = get ( b->num, (char *) &ctx->msg, sizeof(ctx->msg), &length );
204    if ( (status&1) == 0 ) length = -1;
205    if ( ctx->msg.channel != 'R' || ctx->msg.function != 'C' ) {
206	length = -1;
207    }
208    ctx->filled = length - RPC_HDR_SIZE;
209
210    if ( ctx->pos < ctx->filled ) {
211	length = ctx->filled - ctx->pos;
212	if ( length > outl ) length = outl;
213	memmove ( out, ctx->msg.data, length );
214	ctx->pos += length;
215	return length;
216    }
217
218    return length;
219}
220
221static int rtcp_write(BIO *b, const char *in, int inl)
222{
223    int status, i, segment, length;
224    struct rpc_ctx *ctx;
225    /*
226     * Output data, send in chunks no larger that sizeof(ctx->msg.data).
227     */
228    ctx = (struct rpc_ctx *) b->ptr;
229    for ( i = 0; i < inl; i += segment ) {
230	segment = inl - i;
231	if ( segment > sizeof(ctx->msg.data) ) segment = sizeof(ctx->msg.data);
232	ctx->msg.channel = 'R';
233	ctx->msg.function = 'P';
234	ctx->msg.length = segment;
235	memmove ( ctx->msg.data, &in[i], segment );
236	status = put ( b->num, (char *) &ctx->msg, segment + RPC_HDR_SIZE );
237	if ((status&1) == 0 ) { i = -1; break; }
238
239	status = get ( b->num, (char *) &ctx->msg, sizeof(ctx->msg), &length );
240	if ( ((status&1) == 0) || (length < RPC_HDR_SIZE) ) { i = -1; break; }
241	if ( (ctx->msg.channel != 'R') || (ctx->msg.function != 'C') ) {
242	   printf("unexpected response when confirming put %c %c\n",
243		ctx->msg.channel, ctx->msg.function );
244
245	}
246    }
247    return(i);
248}
249
250static long rtcp_ctrl(BIO *b, int cmd, long num, void *ptr)
251	{
252	long ret=1;
253
254	switch (cmd)
255		{
256	case BIO_CTRL_RESET:
257	case BIO_CTRL_EOF:
258		ret = 1;
259		break;
260	case BIO_C_SET_FD:
261		b->num = num;
262		ret = 1;
263	 	break;
264	case BIO_CTRL_SET_CLOSE:
265	case BIO_CTRL_FLUSH:
266	case BIO_CTRL_DUP:
267		ret=1;
268		break;
269	case BIO_CTRL_GET_CLOSE:
270	case BIO_CTRL_INFO:
271	case BIO_CTRL_GET:
272	case BIO_CTRL_PENDING:
273	case BIO_CTRL_WPENDING:
274	default:
275		ret=0;
276		break;
277		}
278	return(ret);
279	}
280
281static int rtcp_gets(BIO *bp, char *buf, int size)
282	{
283	return(0);
284	}
285
286static int rtcp_puts(BIO *bp, const char *str)
287{
288    int length;
289    if (str == NULL) return(0);
290    length = strlen ( str );
291    if ( length == 0 ) return (0);
292    return rtcp_write ( bp,str, length );
293}
294
295