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-rw-r--r--src/lib/libcrypto/bio/bf_buff.c520
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diff --git a/src/lib/libcrypto/bio/bf_buff.c b/src/lib/libcrypto/bio/bf_buff.c
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1/* $OpenBSD: bf_buff.c,v 1.23 2015/07/19 18:29:31 miod Exp $ */
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#include <errno.h>
60#include <stdio.h>
61#include <string.h>
62
63#include <openssl/bio.h>
64#include <openssl/err.h>
65
66static int buffer_write(BIO *h, const char *buf, int num);
67static int buffer_read(BIO *h, char *buf, int size);
68static int buffer_puts(BIO *h, const char *str);
69static int buffer_gets(BIO *h, char *str, int size);
70static long buffer_ctrl(BIO *h, int cmd, long arg1, void *arg2);
71static int buffer_new(BIO *h);
72static int buffer_free(BIO *data);
73static long buffer_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp);
74#define DEFAULT_BUFFER_SIZE 4096
75
76static BIO_METHOD methods_buffer = {
77 .type = BIO_TYPE_BUFFER,
78 .name = "buffer",
79 .bwrite = buffer_write,
80 .bread = buffer_read,
81 .bputs = buffer_puts,
82 .bgets = buffer_gets,
83 .ctrl = buffer_ctrl,
84 .create = buffer_new,
85 .destroy = buffer_free,
86 .callback_ctrl = buffer_callback_ctrl
87};
88
89BIO_METHOD *
90BIO_f_buffer(void)
91{
92 return (&methods_buffer);
93}
94
95static int
96buffer_new(BIO *bi)
97{
98 BIO_F_BUFFER_CTX *ctx;
99
100 ctx = malloc(sizeof(BIO_F_BUFFER_CTX));
101 if (ctx == NULL)
102 return (0);
103 ctx->ibuf = malloc(DEFAULT_BUFFER_SIZE);
104 if (ctx->ibuf == NULL) {
105 free(ctx);
106 return (0);
107 }
108 ctx->obuf = malloc(DEFAULT_BUFFER_SIZE);
109 if (ctx->obuf == NULL) {
110 free(ctx->ibuf);
111 free(ctx);
112 return (0);
113 }
114 ctx->ibuf_size = DEFAULT_BUFFER_SIZE;
115 ctx->obuf_size = DEFAULT_BUFFER_SIZE;
116 ctx->ibuf_len = 0;
117 ctx->ibuf_off = 0;
118 ctx->obuf_len = 0;
119 ctx->obuf_off = 0;
120
121 bi->init = 1;
122 bi->ptr = (char *)ctx;
123 bi->flags = 0;
124 return (1);
125}
126
127static int
128buffer_free(BIO *a)
129{
130 BIO_F_BUFFER_CTX *b;
131
132 if (a == NULL)
133 return (0);
134 b = (BIO_F_BUFFER_CTX *)a->ptr;
135 free(b->ibuf);
136 free(b->obuf);
137 free(a->ptr);
138 a->ptr = NULL;
139 a->init = 0;
140 a->flags = 0;
141 return (1);
142}
143
144static int
145buffer_read(BIO *b, char *out, int outl)
146{
147 int i, num = 0;
148 BIO_F_BUFFER_CTX *ctx;
149
150 if (out == NULL)
151 return (0);
152 ctx = (BIO_F_BUFFER_CTX *)b->ptr;
153
154 if ((ctx == NULL) || (b->next_bio == NULL))
155 return (0);
156 num = 0;
157 BIO_clear_retry_flags(b);
158
159start:
160 i = ctx->ibuf_len;
161 /* If there is stuff left over, grab it */
162 if (i != 0) {
163 if (i > outl)
164 i = outl;
165 memcpy(out, &(ctx->ibuf[ctx->ibuf_off]), i);
166 ctx->ibuf_off += i;
167 ctx->ibuf_len -= i;
168 num += i;
169 if (outl == i)
170 return (num);
171 outl -= i;
172 out += i;
173 }
174
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) {
181 for (;;) {
182 i = BIO_read(b->next_bio, out, outl);
183 if (i <= 0) {
184 BIO_copy_next_retry(b);
185 if (i < 0)
186 return ((num > 0) ? num : i);
187 if (i == 0)
188 return (num);
189 }
190 num += i;
191 if (outl == i)
192 return (num);
193 out += i;
194 outl -= i;
195 }
196 }
197 /* else */
198
199 /* we are going to be doing some buffering */
200 i = BIO_read(b->next_bio, ctx->ibuf, ctx->ibuf_size);
201 if (i <= 0) {
202 BIO_copy_next_retry(b);
203 if (i < 0)
204 return ((num > 0) ? num : i);
205 if (i == 0)
206 return (num);
207 }
208 ctx->ibuf_off = 0;
209 ctx->ibuf_len = i;
210
211 /* Lets re-read using ourselves :-) */
212 goto start;
213}
214
215static int
216buffer_write(BIO *b, const char *in, int inl)
217{
218 int i, num = 0;
219 BIO_F_BUFFER_CTX *ctx;
220
221 if ((in == NULL) || (inl <= 0))
222 return (0);
223 ctx = (BIO_F_BUFFER_CTX *)b->ptr;
224 if ((ctx == NULL) || (b->next_bio == NULL))
225 return (0);
226
227 BIO_clear_retry_flags(b);
228start:
229 i = ctx->obuf_size - (ctx->obuf_len + ctx->obuf_off);
230 /* add to buffer and return */
231 if (i >= inl) {
232 memcpy(&(ctx->obuf[ctx->obuf_off + ctx->obuf_len]), in, inl);
233 ctx->obuf_len += inl;
234 return (num + inl);
235 }
236 /* else */
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 */
240 {
241 memcpy(&(ctx->obuf[ctx->obuf_off + ctx->obuf_len]), in, i);
242 in += i;
243 inl -= i;
244 num += i;
245 ctx->obuf_len += i;
246 }
247 /* we now have a full buffer needing flushing */
248 for (;;) {
249 i = BIO_write(b->next_bio, &(ctx->obuf[ctx->obuf_off]),
250 ctx->obuf_len);
251 if (i <= 0) {
252 BIO_copy_next_retry(b);
253
254 if (i < 0)
255 return ((num > 0) ? num : i);
256 if (i == 0)
257 return (num);
258 }
259 ctx->obuf_off += i;
260 ctx->obuf_len -= i;
261 if (ctx->obuf_len == 0)
262 break;
263 }
264 }
265 /* we only get here if the buffer has been flushed and we
266 * still have stuff to write */
267 ctx->obuf_off = 0;
268
269 /* we now have inl bytes to write */
270 while (inl >= ctx->obuf_size) {
271 i = BIO_write(b->next_bio, in, inl);
272 if (i <= 0) {
273 BIO_copy_next_retry(b);
274 if (i < 0)
275 return ((num > 0) ? num : i);
276 if (i == 0)
277 return (num);
278 }
279 num += i;
280 in += i;
281 inl -= i;
282 if (inl == 0)
283 return (num);
284 }
285
286 /* copy the rest into the buffer since we have only a small
287 * amount left */
288 goto start;
289}
290
291static long
292buffer_ctrl(BIO *b, int cmd, long num, void *ptr)
293{
294 BIO *dbio;
295 BIO_F_BUFFER_CTX *ctx;
296 long ret = 1;
297 char *p1, *p2;
298 int r, i, *ip;
299 int ibs, obs;
300
301 ctx = (BIO_F_BUFFER_CTX *)b->ptr;
302
303 switch (cmd) {
304 case BIO_CTRL_RESET:
305 ctx->ibuf_off = 0;
306 ctx->ibuf_len = 0;
307 ctx->obuf_off = 0;
308 ctx->obuf_len = 0;
309 if (b->next_bio == NULL)
310 return (0);
311 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
312 break;
313 case BIO_CTRL_INFO:
314 ret = (long)ctx->obuf_len;
315 break;
316 case BIO_C_GET_BUFF_NUM_LINES:
317 ret = 0;
318 p1 = ctx->ibuf;
319 for (i = 0; i < ctx->ibuf_len; i++) {
320 if (p1[ctx->ibuf_off + i] == '\n')
321 ret++;
322 }
323 break;
324 case BIO_CTRL_WPENDING:
325 ret = (long)ctx->obuf_len;
326 if (ret == 0) {
327 if (b->next_bio == NULL)
328 return (0);
329 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
330 }
331 break;
332 case BIO_CTRL_PENDING:
333 ret = (long)ctx->ibuf_len;
334 if (ret == 0) {
335 if (b->next_bio == NULL)
336 return (0);
337 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
338 }
339 break;
340 case BIO_C_SET_BUFF_READ_DATA:
341 if (num > ctx->ibuf_size) {
342 p1 = malloc(num);
343 if (p1 == NULL)
344 goto malloc_error;
345 free(ctx->ibuf);
346 ctx->ibuf = p1;
347 }
348 ctx->ibuf_off = 0;
349 ctx->ibuf_len = (int)num;
350 memcpy(ctx->ibuf, ptr, num);
351 ret = 1;
352 break;
353 case BIO_C_SET_BUFF_SIZE:
354 if (ptr != NULL) {
355 ip = (int *)ptr;
356 if (*ip == 0) {
357 ibs = (int)num;
358 obs = ctx->obuf_size;
359 }
360 else /* if (*ip == 1) */
361 {
362 ibs = ctx->ibuf_size;
363 obs = (int)num;
364 }
365 } else {
366 ibs = (int)num;
367 obs = (int)num;
368 }
369 p1 = ctx->ibuf;
370 p2 = ctx->obuf;
371 if ((ibs > DEFAULT_BUFFER_SIZE) && (ibs != ctx->ibuf_size)) {
372 p1 = malloc(num);
373 if (p1 == NULL)
374 goto malloc_error;
375 }
376 if ((obs > DEFAULT_BUFFER_SIZE) && (obs != ctx->obuf_size)) {
377 p2 = malloc(num);
378 if (p2 == NULL) {
379 if (p1 != ctx->ibuf)
380 free(p1);
381 goto malloc_error;
382 }
383 }
384 if (ctx->ibuf != p1) {
385 free(ctx->ibuf);
386 ctx->ibuf = p1;
387 ctx->ibuf_off = 0;
388 ctx->ibuf_len = 0;
389 ctx->ibuf_size = ibs;
390 }
391 if (ctx->obuf != p2) {
392 free(ctx->obuf);
393 ctx->obuf = p2;
394 ctx->obuf_off = 0;
395 ctx->obuf_len = 0;
396 ctx->obuf_size = obs;
397 }
398 break;
399 case BIO_C_DO_STATE_MACHINE:
400 if (b->next_bio == NULL)
401 return (0);
402 BIO_clear_retry_flags(b);
403 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
404 BIO_copy_next_retry(b);
405 break;
406
407 case BIO_CTRL_FLUSH:
408 if (b->next_bio == NULL)
409 return (0);
410 if (ctx->obuf_len <= 0) {
411 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
412 break;
413 }
414
415 for (;;) {
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]),
420 ctx->obuf_len);
421 BIO_copy_next_retry(b);
422 if (r <= 0)
423 return ((long)r);
424 ctx->obuf_off += r;
425 ctx->obuf_len -= r;
426 } else {
427 ctx->obuf_len = 0;
428 ctx->obuf_off = 0;
429 break;
430 }
431 }
432 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
433 break;
434 case BIO_CTRL_DUP:
435 dbio = (BIO *)ptr;
436 if (!BIO_set_read_buffer_size(dbio, ctx->ibuf_size) ||
437 !BIO_set_write_buffer_size(dbio, ctx->obuf_size))
438 ret = 0;
439 break;
440 default:
441 if (b->next_bio == NULL)
442 return (0);
443 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
444 break;
445 }
446 return (ret);
447malloc_error:
448 BIOerr(BIO_F_BUFFER_CTRL, ERR_R_MALLOC_FAILURE);
449 return (0);
450}
451
452static long
453buffer_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
454{
455 long ret = 1;
456
457 if (b->next_bio == NULL)
458 return (0);
459 switch (cmd) {
460 default:
461 ret = BIO_callback_ctrl(b->next_bio, cmd, fp);
462 break;
463 }
464 return (ret);
465}
466
467static int
468buffer_gets(BIO *b, char *buf, int size)
469{
470 BIO_F_BUFFER_CTX *ctx;
471 int num = 0, i, flag;
472 char *p;
473
474 ctx = (BIO_F_BUFFER_CTX *)b->ptr;
475 size--; /* reserve space for a '\0' */
476 BIO_clear_retry_flags(b);
477
478 for (;;) {
479 if (ctx->ibuf_len > 0) {
480 p = &(ctx->ibuf[ctx->ibuf_off]);
481 flag = 0;
482 for (i = 0; (i < ctx->ibuf_len) && (i < size); i++) {
483 *(buf++) = p[i];
484 if (p[i] == '\n') {
485 flag = 1;
486 i++;
487 break;
488 }
489 }
490 num += i;
491 size -= i;
492 ctx->ibuf_len -= i;
493 ctx->ibuf_off += i;
494 if (flag || size == 0) {
495 *buf = '\0';
496 return (num);
497 }
498 }
499 else /* read another chunk */
500 {
501 i = BIO_read(b->next_bio, ctx->ibuf, ctx->ibuf_size);
502 if (i <= 0) {
503 BIO_copy_next_retry(b);
504 *buf = '\0';
505 if (i < 0)
506 return ((num > 0) ? num : i);
507 if (i == 0)
508 return (num);
509 }
510 ctx->ibuf_len = i;
511 ctx->ibuf_off = 0;
512 }
513 }
514}
515
516static int
517buffer_puts(BIO *b, const char *str)
518{
519 return (buffer_write(b, str, strlen(str)));
520}
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