1 /* $OpenBSD: bf_buff.c,v 1.22 2015/07/19 01:18:17 beck Exp $ */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
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).
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.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
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)"
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
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.]
63 #include <openssl/bio.h>
64 #include <openssl/err.h>
66 static int buffer_write(BIO *h, const char *buf, int num);
67 static int buffer_read(BIO *h, char *buf, int size);
68 static int buffer_puts(BIO *h, const char *str);
69 static int buffer_gets(BIO *h, char *str, int size);
70 static long buffer_ctrl(BIO *h, int cmd, long arg1, void *arg2);
71 static int buffer_new(BIO *h);
72 static int buffer_free(BIO *data);
73 static long buffer_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp);
74 #define DEFAULT_BUFFER_SIZE 4096
76 static BIO_METHOD methods_buffer = {
77 .type = BIO_TYPE_BUFFER,
79 .bwrite = buffer_write,
85 .destroy = buffer_free,
86 .callback_ctrl = buffer_callback_ctrl
92 return (&methods_buffer);
98 BIO_F_BUFFER_CTX *ctx;
100 ctx = malloc(sizeof(BIO_F_BUFFER_CTX));
103 ctx->ibuf = malloc(DEFAULT_BUFFER_SIZE);
104 if (ctx->ibuf == NULL) {
108 ctx->obuf = malloc(DEFAULT_BUFFER_SIZE);
109 if (ctx->obuf == NULL) {
114 ctx->ibuf_size = DEFAULT_BUFFER_SIZE;
115 ctx->obuf_size = DEFAULT_BUFFER_SIZE;
122 bi->ptr = (char *)ctx;
134 b = (BIO_F_BUFFER_CTX *)a->ptr;
145 buffer_read(BIO *b, char *out, int outl)
148 BIO_F_BUFFER_CTX *ctx;
152 ctx = (BIO_F_BUFFER_CTX *)b->ptr;
154 if ((ctx == NULL) || (b->next_bio == NULL))
157 BIO_clear_retry_flags(b);
161 /* If there is stuff left over, grab it */
165 memcpy(out, &(ctx->ibuf[ctx->ibuf_off]), i);
175 /* We may have done a partial read. try to do more.
176 * We have nothing in the buffer.
177 * If we get an error and have read some data, just return it
178 * and let them retry to get the error again.
179 * copy direct to parent address space */
180 if (outl > ctx->ibuf_size) {
182 i = BIO_read(b->next_bio, out, outl);
184 BIO_copy_next_retry(b);
186 return ((num > 0) ? num : i);
199 /* we are going to be doing some buffering */
200 i = BIO_read(b->next_bio, ctx->ibuf, ctx->ibuf_size);
202 BIO_copy_next_retry(b);
204 return ((num > 0) ? num : i);
211 /* Lets re-read using ourselves :-) */
216 buffer_write(BIO *b, const char *in, int inl)
219 BIO_F_BUFFER_CTX *ctx;
221 if ((in == NULL) || (inl <= 0))
223 ctx = (BIO_F_BUFFER_CTX *)b->ptr;
224 if ((ctx == NULL) || (b->next_bio == NULL))
227 BIO_clear_retry_flags(b);
229 i = ctx->obuf_size - (ctx->obuf_len + ctx->obuf_off);
230 /* add to buffer and return */
232 memcpy(&(ctx->obuf[ctx->obuf_off + ctx->obuf_len]), in, inl);
233 ctx->obuf_len += inl;
237 /* stuff already in buffer, so add to it first, then flush */
238 if (ctx->obuf_len != 0) {
239 if (i > 0) /* lets fill it up if we can */
241 memcpy(&(ctx->obuf[ctx->obuf_off + ctx->obuf_len]), in, i);
247 /* we now have a full buffer needing flushing */
249 i = BIO_write(b->next_bio, &(ctx->obuf[ctx->obuf_off]),
252 BIO_copy_next_retry(b);
255 return ((num > 0) ? num : i);
261 if (ctx->obuf_len == 0)
265 /* we only get here if the buffer has been flushed and we
266 * still have stuff to write */
269 /* we now have inl bytes to write */
270 while (inl >= ctx->obuf_size) {
271 i = BIO_write(b->next_bio, in, inl);
273 BIO_copy_next_retry(b);
275 return ((num > 0) ? num : i);
286 /* copy the rest into the buffer since we have only a small
292 buffer_ctrl(BIO *b, int cmd, long num, void *ptr)
295 BIO_F_BUFFER_CTX *ctx;
301 ctx = (BIO_F_BUFFER_CTX *)b->ptr;
309 if (b->next_bio == NULL)
311 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
314 ret = (long)ctx->obuf_len;
316 case BIO_C_GET_BUFF_NUM_LINES:
319 for (i = 0; i < ctx->ibuf_len; i++) {
320 if (p1[ctx->ibuf_off + i] == '\n')
324 case BIO_CTRL_WPENDING:
325 ret = (long)ctx->obuf_len;
327 if (b->next_bio == NULL)
329 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
332 case BIO_CTRL_PENDING:
333 ret = (long)ctx->ibuf_len;
335 if (b->next_bio == NULL)
337 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
340 case BIO_C_SET_BUFF_READ_DATA:
341 if (num > ctx->ibuf_size) {
349 ctx->ibuf_len = (int)num;
350 memcpy(ctx->ibuf, ptr, num);
353 case BIO_C_SET_BUFF_SIZE:
358 obs = ctx->obuf_size;
360 else /* if (*ip == 1) */
362 ibs = ctx->ibuf_size;
371 if ((ibs > DEFAULT_BUFFER_SIZE) && (ibs != ctx->ibuf_size)) {
376 if ((obs > DEFAULT_BUFFER_SIZE) && (obs != ctx->obuf_size)) {
384 if (ctx->ibuf != p1) {
389 ctx->ibuf_size = ibs;
391 if (ctx->obuf != p2) {
396 ctx->obuf_size = obs;
399 case BIO_C_DO_STATE_MACHINE:
400 if (b->next_bio == NULL)
402 BIO_clear_retry_flags(b);
403 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
404 BIO_copy_next_retry(b);
408 if (b->next_bio == NULL)
410 if (ctx->obuf_len <= 0) {
411 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
416 BIO_clear_retry_flags(b);
417 if (ctx->obuf_len > 0) {
418 r = BIO_write(b->next_bio,
419 &(ctx->obuf[ctx->obuf_off]),
421 BIO_copy_next_retry(b);
432 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
436 if (!BIO_set_read_buffer_size(dbio, ctx->ibuf_size) ||
437 !BIO_set_write_buffer_size(dbio, ctx->obuf_size))
441 if (b->next_bio == NULL)
443 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
448 BIOerr(BIO_F_BUFFER_CTRL, ERR_R_MALLOC_FAILURE);
453 buffer_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
457 if (b->next_bio == NULL)
461 ret = BIO_callback_ctrl(b->next_bio, cmd, fp);
468 buffer_gets(BIO *b, char *buf, int size)
470 BIO_F_BUFFER_CTX *ctx;
471 int num = 0, i, flag;
474 ctx = (BIO_F_BUFFER_CTX *)b->ptr;
475 size--; /* reserve space for a '\0' */
476 BIO_clear_retry_flags(b);
479 if (ctx->ibuf_len > 0) {
480 p = &(ctx->ibuf[ctx->ibuf_off]);
482 for (i = 0; (i < ctx->ibuf_len) && (i < size); i++) {
494 if (flag || size == 0) {
499 else /* read another chunk */
501 i = BIO_read(b->next_bio, ctx->ibuf, ctx->ibuf_size);
503 BIO_copy_next_retry(b);
506 return ((num > 0) ? num : i);
517 buffer_puts(BIO *b, const char *str)
519 return (buffer_write(b, str, strlen(str)));