bss_rtcp.c revision 306195 
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/*-
60 * Written by David L. Jones <jonesd@kcgl1.eng.ohio-state.edu>
61 * Date:   22-JUL-1996
62 * Revised: 25-SEP-1997         Update for 0.8.1, BIO_CTRL_SET -> BIO_C_SET_FD
63 */
64/* VMS */
65#include <stdio.h>
66#include <stdlib.h>
67#include <string.h>
68#include <errno.h>
69#include "cryptlib.h"
70#include <openssl/bio.h>
71
72#include <iodef.h>              /* VMS IO$_ definitions */
73#include <starlet.h>
74
75typedef unsigned short io_channel;
76/*************************************************************************/
77struct io_status {
78    short status, count;
79    long flags;
80};
81
82/* Should have member alignment inhibited */
83struct rpc_msg {
84    /* 'A'-app data. 'R'-remote client 'G'-global */
85    char channel;
86    /* 'G'-get, 'P'-put, 'C'-confirm, 'X'-close */
87    char function;
88    /* Amount of data returned or max to return */
89    unsigned short int length;
90    /* variable data */
91    char data[4092];
92};
93#define RPC_HDR_SIZE (sizeof(struct rpc_msg) - 4092)
94
95struct rpc_ctx {
96    int filled, pos;
97    struct rpc_msg msg;
98};
99
100static int rtcp_write(BIO *h, const char *buf, int num);
101static int rtcp_read(BIO *h, char *buf, int size);
102static int rtcp_puts(BIO *h, const char *str);
103static int rtcp_gets(BIO *h, char *str, int size);
104static long rtcp_ctrl(BIO *h, int cmd, long arg1, void *arg2);
105static int rtcp_new(BIO *h);
106static int rtcp_free(BIO *data);
107
108static BIO_METHOD rtcp_method = {
109    BIO_TYPE_FD,
110    "RTCP",
111    rtcp_write,
112    rtcp_read,
113    rtcp_puts,
114    rtcp_gets,
115    rtcp_ctrl,
116    rtcp_new,
117    rtcp_free,
118    NULL,
119};
120
121BIO_METHOD *BIO_s_rtcp(void)
122{
123    return (&rtcp_method);
124}
125
126/*****************************************************************************/
127/*
128 * Decnet I/O routines.
129 */
130
131#ifdef __DECC
132# pragma message save
133# pragma message disable DOLLARID
134#endif
135
136static int get(io_channel chan, char *buffer, int maxlen, int *length)
137{
138    int status;
139    struct io_status iosb;
140    status = sys$qiow(0, chan, IO$_READVBLK, &iosb, 0, 0,
141                      buffer, maxlen, 0, 0, 0, 0);
142    if ((status & 1) == 1)
143        status = iosb.status;
144    if ((status & 1) == 1)
145        *length = iosb.count;
146    return status;
147}
148
149static int put(io_channel chan, char *buffer, int length)
150{
151    int status;
152    struct io_status iosb;
153    status = sys$qiow(0, chan, IO$_WRITEVBLK, &iosb, 0, 0,
154                      buffer, length, 0, 0, 0, 0);
155    if ((status & 1) == 1)
156        status = iosb.status;
157    return status;
158}
159
160#ifdef __DECC
161# pragma message restore
162#endif
163
164/***************************************************************************/
165
166static int rtcp_new(BIO *bi)
167{
168    struct rpc_ctx *ctx;
169    bi->init = 1;
170    bi->num = 0;
171    bi->flags = 0;
172    bi->ptr = OPENSSL_malloc(sizeof(struct rpc_ctx));
173    if (bi->ptr == NULL)
174        return (0);
175    ctx = (struct rpc_ctx *)bi->ptr;
176    ctx->filled = 0;
177    ctx->pos = 0;
178    return (1);
179}
180
181static int rtcp_free(BIO *a)
182{
183    if (a == NULL)
184        return (0);
185    if (a->ptr)
186        OPENSSL_free(a->ptr);
187    a->ptr = NULL;
188    return (1);
189}
190
191static int rtcp_read(BIO *b, char *out, int outl)
192{
193    int status, length;
194    struct rpc_ctx *ctx;
195    /*
196     * read data, return existing.
197     */
198    ctx = (struct rpc_ctx *)b->ptr;
199    if (ctx->pos < ctx->filled) {
200        length = ctx->filled - ctx->pos;
201        if (length > outl)
202            length = outl;
203        memmove(out, &ctx->msg.data[ctx->pos], length);
204        ctx->pos += length;
205        return length;
206    }
207    /*
208     * Requst more data from R channel.
209     */
210    ctx->msg.channel = 'R';
211    ctx->msg.function = 'G';
212    ctx->msg.length = sizeof(ctx->msg.data);
213    status = put(b->num, (char *)&ctx->msg, RPC_HDR_SIZE);
214    if ((status & 1) == 0) {
215        return -1;
216    }
217    /*
218     * Read.
219     */
220    ctx->pos = ctx->filled = 0;
221    status = get(b->num, (char *)&ctx->msg, sizeof(ctx->msg), &length);
222    if ((status & 1) == 0)
223        length = -1;
224    if (ctx->msg.channel != 'R' || ctx->msg.function != 'C') {
225        length = -1;
226    }
227    ctx->filled = length - RPC_HDR_SIZE;
228
229    if (ctx->pos < ctx->filled) {
230        length = ctx->filled - ctx->pos;
231        if (length > outl)
232            length = outl;
233        memmove(out, ctx->msg.data, length);
234        ctx->pos += length;
235        return length;
236    }
237
238    return length;
239}
240
241static int rtcp_write(BIO *b, const char *in, int inl)
242{
243    int status, i, segment, length;
244    struct rpc_ctx *ctx;
245    /*
246     * Output data, send in chunks no larger that sizeof(ctx->msg.data).
247     */
248    ctx = (struct rpc_ctx *)b->ptr;
249    for (i = 0; i < inl; i += segment) {
250        segment = inl - i;
251        if (segment > sizeof(ctx->msg.data))
252            segment = sizeof(ctx->msg.data);
253        ctx->msg.channel = 'R';
254        ctx->msg.function = 'P';
255        ctx->msg.length = segment;
256        memmove(ctx->msg.data, &in[i], segment);
257        status = put(b->num, (char *)&ctx->msg, segment + RPC_HDR_SIZE);
258        if ((status & 1) == 0) {
259            i = -1;
260            break;
261        }
262
263        status = get(b->num, (char *)&ctx->msg, sizeof(ctx->msg), &length);
264        if (((status & 1) == 0) || (length < RPC_HDR_SIZE)) {
265            i = -1;
266            break;
267        }
268        if ((ctx->msg.channel != 'R') || (ctx->msg.function != 'C')) {
269            printf("unexpected response when confirming put %c %c\n",
270                   ctx->msg.channel, ctx->msg.function);
271
272        }
273    }
274    return (i);
275}
276
277static long rtcp_ctrl(BIO *b, int cmd, long num, void *ptr)
278{
279    long ret = 1;
280
281    switch (cmd) {
282    case BIO_CTRL_RESET:
283    case BIO_CTRL_EOF:
284        ret = 1;
285        break;
286    case BIO_C_SET_FD:
287        b->num = num;
288        ret = 1;
289        break;
290    case BIO_CTRL_SET_CLOSE:
291    case BIO_CTRL_FLUSH:
292    case BIO_CTRL_DUP:
293        ret = 1;
294        break;
295    case BIO_CTRL_GET_CLOSE:
296    case BIO_CTRL_INFO:
297    case BIO_CTRL_GET:
298    case BIO_CTRL_PENDING:
299    case BIO_CTRL_WPENDING:
300    default:
301        ret = 0;
302        break;
303    }
304    return (ret);
305}
306
307static int rtcp_gets(BIO *bp, char *buf, int size)
308{
309    return (0);
310}
311
312static int rtcp_puts(BIO *bp, const char *str)
313{
314    int length;
315    if (str == NULL)
316        return (0);
317    length = strlen(str);
318    if (length == 0)
319        return (0);
320    return rtcp_write(bp, str, length);
321}
322