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d02b48c6 | 1 | /* crypto/bio/bf_buff.c */ |
58964a49 | 2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
d02b48c6 RE |
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. | |
0f113f3e | 8 | * |
d02b48c6 RE |
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). | |
0f113f3e | 15 | * |
d02b48c6 RE |
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. | |
0f113f3e | 22 | * |
d02b48c6 RE |
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 :-). | |
0f113f3e | 37 | * 4. If you include any Windows specific code (or a derivative thereof) from |
d02b48c6 RE |
38 | * the apps directory (application code) you must include an acknowledgement: |
39 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
0f113f3e | 40 | * |
d02b48c6 RE |
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. | |
0f113f3e | 52 | * |
d02b48c6 RE |
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 <stdio.h> | |
60 | #include <errno.h> | |
b39fc560 | 61 | #include "internal/cryptlib.h" |
ec577822 | 62 | #include <openssl/bio.h> |
d02b48c6 | 63 | |
0f113f3e | 64 | static int buffer_write(BIO *h, const char *buf, int num); |
0e1c0612 UM |
65 | static int buffer_read(BIO *h, char *buf, int size); |
66 | static int buffer_puts(BIO *h, const char *str); | |
67 | static int buffer_gets(BIO *h, char *str, int size); | |
68 | static long buffer_ctrl(BIO *h, int cmd, long arg1, void *arg2); | |
d02b48c6 RE |
69 | static int buffer_new(BIO *h); |
70 | static int buffer_free(BIO *data); | |
13083215 | 71 | static long buffer_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp); |
0f113f3e MC |
72 | #define DEFAULT_BUFFER_SIZE 4096 |
73 | ||
74 | static BIO_METHOD methods_buffer = { | |
75 | BIO_TYPE_BUFFER, | |
76 | "buffer", | |
77 | buffer_write, | |
78 | buffer_read, | |
79 | buffer_puts, | |
80 | buffer_gets, | |
81 | buffer_ctrl, | |
82 | buffer_new, | |
83 | buffer_free, | |
84 | buffer_callback_ctrl, | |
85 | }; | |
d02b48c6 | 86 | |
6b691a5c | 87 | BIO_METHOD *BIO_f_buffer(void) |
0f113f3e MC |
88 | { |
89 | return (&methods_buffer); | |
90 | } | |
d02b48c6 | 91 | |
6b691a5c | 92 | static int buffer_new(BIO *bi) |
0f113f3e | 93 | { |
64b25758 | 94 | BIO_F_BUFFER_CTX *ctx = OPENSSL_zalloc(sizeof(*ctx)); |
0f113f3e | 95 | |
0f113f3e MC |
96 | if (ctx == NULL) |
97 | return (0); | |
64b25758 | 98 | ctx->ibuf_size = DEFAULT_BUFFER_SIZE; |
b196e7d9 | 99 | ctx->ibuf = OPENSSL_malloc(DEFAULT_BUFFER_SIZE); |
0f113f3e MC |
100 | if (ctx->ibuf == NULL) { |
101 | OPENSSL_free(ctx); | |
102 | return (0); | |
103 | } | |
64b25758 | 104 | ctx->obuf_size = DEFAULT_BUFFER_SIZE; |
b196e7d9 | 105 | ctx->obuf = OPENSSL_malloc(DEFAULT_BUFFER_SIZE); |
0f113f3e MC |
106 | if (ctx->obuf == NULL) { |
107 | OPENSSL_free(ctx->ibuf); | |
108 | OPENSSL_free(ctx); | |
109 | return (0); | |
110 | } | |
0f113f3e MC |
111 | |
112 | bi->init = 1; | |
113 | bi->ptr = (char *)ctx; | |
114 | bi->flags = 0; | |
115 | return (1); | |
116 | } | |
d02b48c6 | 117 | |
6b691a5c | 118 | static int buffer_free(BIO *a) |
0f113f3e MC |
119 | { |
120 | BIO_F_BUFFER_CTX *b; | |
121 | ||
122 | if (a == NULL) | |
123 | return (0); | |
124 | b = (BIO_F_BUFFER_CTX *)a->ptr; | |
b548a1f1 RS |
125 | OPENSSL_free(b->ibuf); |
126 | OPENSSL_free(b->obuf); | |
0f113f3e MC |
127 | OPENSSL_free(a->ptr); |
128 | a->ptr = NULL; | |
129 | a->init = 0; | |
130 | a->flags = 0; | |
131 | return (1); | |
132 | } | |
133 | ||
6b691a5c | 134 | static int buffer_read(BIO *b, char *out, int outl) |
0f113f3e MC |
135 | { |
136 | int i, num = 0; | |
137 | BIO_F_BUFFER_CTX *ctx; | |
138 | ||
139 | if (out == NULL) | |
140 | return (0); | |
141 | ctx = (BIO_F_BUFFER_CTX *)b->ptr; | |
142 | ||
143 | if ((ctx == NULL) || (b->next_bio == NULL)) | |
144 | return (0); | |
145 | num = 0; | |
146 | BIO_clear_retry_flags(b); | |
147 | ||
148 | start: | |
149 | i = ctx->ibuf_len; | |
150 | /* If there is stuff left over, grab it */ | |
151 | if (i != 0) { | |
152 | if (i > outl) | |
153 | i = outl; | |
154 | memcpy(out, &(ctx->ibuf[ctx->ibuf_off]), i); | |
155 | ctx->ibuf_off += i; | |
156 | ctx->ibuf_len -= i; | |
157 | num += i; | |
158 | if (outl == i) | |
159 | return (num); | |
160 | outl -= i; | |
161 | out += i; | |
162 | } | |
163 | ||
164 | /* | |
165 | * We may have done a partial read. try to do more. We have nothing in | |
166 | * the buffer. If we get an error and have read some data, just return it | |
167 | * and let them retry to get the error again. copy direct to parent | |
168 | * address space | |
169 | */ | |
170 | if (outl > ctx->ibuf_size) { | |
171 | for (;;) { | |
172 | i = BIO_read(b->next_bio, out, outl); | |
173 | if (i <= 0) { | |
174 | BIO_copy_next_retry(b); | |
175 | if (i < 0) | |
176 | return ((num > 0) ? num : i); | |
177 | if (i == 0) | |
178 | return (num); | |
179 | } | |
180 | num += i; | |
181 | if (outl == i) | |
182 | return (num); | |
183 | out += i; | |
184 | outl -= i; | |
185 | } | |
186 | } | |
187 | /* else */ | |
188 | ||
189 | /* we are going to be doing some buffering */ | |
190 | i = BIO_read(b->next_bio, ctx->ibuf, ctx->ibuf_size); | |
191 | if (i <= 0) { | |
192 | BIO_copy_next_retry(b); | |
193 | if (i < 0) | |
194 | return ((num > 0) ? num : i); | |
195 | if (i == 0) | |
196 | return (num); | |
197 | } | |
198 | ctx->ibuf_off = 0; | |
199 | ctx->ibuf_len = i; | |
200 | ||
201 | /* Lets re-read using ourselves :-) */ | |
202 | goto start; | |
203 | } | |
d02b48c6 | 204 | |
0e1c0612 | 205 | static int buffer_write(BIO *b, const char *in, int inl) |
0f113f3e MC |
206 | { |
207 | int i, num = 0; | |
208 | BIO_F_BUFFER_CTX *ctx; | |
209 | ||
210 | if ((in == NULL) || (inl <= 0)) | |
211 | return (0); | |
212 | ctx = (BIO_F_BUFFER_CTX *)b->ptr; | |
213 | if ((ctx == NULL) || (b->next_bio == NULL)) | |
214 | return (0); | |
215 | ||
216 | BIO_clear_retry_flags(b); | |
217 | start: | |
218 | i = ctx->obuf_size - (ctx->obuf_len + ctx->obuf_off); | |
219 | /* add to buffer and return */ | |
220 | if (i >= inl) { | |
221 | memcpy(&(ctx->obuf[ctx->obuf_off + ctx->obuf_len]), in, inl); | |
222 | ctx->obuf_len += inl; | |
223 | return (num + inl); | |
224 | } | |
225 | /* else */ | |
226 | /* stuff already in buffer, so add to it first, then flush */ | |
227 | if (ctx->obuf_len != 0) { | |
228 | if (i > 0) { /* lets fill it up if we can */ | |
229 | memcpy(&(ctx->obuf[ctx->obuf_off + ctx->obuf_len]), in, i); | |
230 | in += i; | |
231 | inl -= i; | |
232 | num += i; | |
233 | ctx->obuf_len += i; | |
234 | } | |
235 | /* we now have a full buffer needing flushing */ | |
236 | for (;;) { | |
237 | i = BIO_write(b->next_bio, &(ctx->obuf[ctx->obuf_off]), | |
238 | ctx->obuf_len); | |
239 | if (i <= 0) { | |
240 | BIO_copy_next_retry(b); | |
241 | ||
242 | if (i < 0) | |
243 | return ((num > 0) ? num : i); | |
244 | if (i == 0) | |
245 | return (num); | |
246 | } | |
247 | ctx->obuf_off += i; | |
248 | ctx->obuf_len -= i; | |
249 | if (ctx->obuf_len == 0) | |
250 | break; | |
251 | } | |
252 | } | |
253 | /* | |
254 | * we only get here if the buffer has been flushed and we still have | |
255 | * stuff to write | |
256 | */ | |
257 | ctx->obuf_off = 0; | |
258 | ||
259 | /* we now have inl bytes to write */ | |
260 | while (inl >= ctx->obuf_size) { | |
261 | i = BIO_write(b->next_bio, in, inl); | |
262 | if (i <= 0) { | |
263 | BIO_copy_next_retry(b); | |
264 | if (i < 0) | |
265 | return ((num > 0) ? num : i); | |
266 | if (i == 0) | |
267 | return (num); | |
268 | } | |
269 | num += i; | |
270 | in += i; | |
271 | inl -= i; | |
272 | if (inl == 0) | |
273 | return (num); | |
274 | } | |
275 | ||
276 | /* | |
277 | * copy the rest into the buffer since we have only a small amount left | |
278 | */ | |
279 | goto start; | |
280 | } | |
d02b48c6 | 281 | |
0e1c0612 | 282 | static long buffer_ctrl(BIO *b, int cmd, long num, void *ptr) |
0f113f3e MC |
283 | { |
284 | BIO *dbio; | |
285 | BIO_F_BUFFER_CTX *ctx; | |
286 | long ret = 1; | |
287 | char *p1, *p2; | |
288 | int r, i, *ip; | |
289 | int ibs, obs; | |
290 | ||
291 | ctx = (BIO_F_BUFFER_CTX *)b->ptr; | |
292 | ||
293 | switch (cmd) { | |
294 | case BIO_CTRL_RESET: | |
295 | ctx->ibuf_off = 0; | |
296 | ctx->ibuf_len = 0; | |
297 | ctx->obuf_off = 0; | |
298 | ctx->obuf_len = 0; | |
299 | if (b->next_bio == NULL) | |
300 | return (0); | |
301 | ret = BIO_ctrl(b->next_bio, cmd, num, ptr); | |
302 | break; | |
303 | case BIO_CTRL_INFO: | |
304 | ret = (long)ctx->obuf_len; | |
305 | break; | |
306 | case BIO_C_GET_BUFF_NUM_LINES: | |
307 | ret = 0; | |
308 | p1 = ctx->ibuf; | |
309 | for (i = 0; i < ctx->ibuf_len; i++) { | |
310 | if (p1[ctx->ibuf_off + i] == '\n') | |
311 | ret++; | |
312 | } | |
313 | break; | |
314 | case BIO_CTRL_WPENDING: | |
315 | ret = (long)ctx->obuf_len; | |
316 | if (ret == 0) { | |
317 | if (b->next_bio == NULL) | |
318 | return (0); | |
319 | ret = BIO_ctrl(b->next_bio, cmd, num, ptr); | |
320 | } | |
321 | break; | |
322 | case BIO_CTRL_PENDING: | |
323 | ret = (long)ctx->ibuf_len; | |
324 | if (ret == 0) { | |
325 | if (b->next_bio == NULL) | |
326 | return (0); | |
327 | ret = BIO_ctrl(b->next_bio, cmd, num, ptr); | |
328 | } | |
329 | break; | |
330 | case BIO_C_SET_BUFF_READ_DATA: | |
331 | if (num > ctx->ibuf_size) { | |
332 | p1 = OPENSSL_malloc((int)num); | |
333 | if (p1 == NULL) | |
334 | goto malloc_error; | |
b548a1f1 | 335 | OPENSSL_free(ctx->ibuf); |
0f113f3e MC |
336 | ctx->ibuf = p1; |
337 | } | |
338 | ctx->ibuf_off = 0; | |
339 | ctx->ibuf_len = (int)num; | |
340 | memcpy(ctx->ibuf, ptr, (int)num); | |
341 | ret = 1; | |
342 | break; | |
343 | case BIO_C_SET_BUFF_SIZE: | |
344 | if (ptr != NULL) { | |
345 | ip = (int *)ptr; | |
346 | if (*ip == 0) { | |
347 | ibs = (int)num; | |
348 | obs = ctx->obuf_size; | |
349 | } else { /* if (*ip == 1) */ | |
350 | ||
351 | ibs = ctx->ibuf_size; | |
352 | obs = (int)num; | |
353 | } | |
354 | } else { | |
355 | ibs = (int)num; | |
356 | obs = (int)num; | |
357 | } | |
358 | p1 = ctx->ibuf; | |
359 | p2 = ctx->obuf; | |
360 | if ((ibs > DEFAULT_BUFFER_SIZE) && (ibs != ctx->ibuf_size)) { | |
b196e7d9 | 361 | p1 = OPENSSL_malloc((int)num); |
0f113f3e MC |
362 | if (p1 == NULL) |
363 | goto malloc_error; | |
364 | } | |
365 | if ((obs > DEFAULT_BUFFER_SIZE) && (obs != ctx->obuf_size)) { | |
b196e7d9 | 366 | p2 = OPENSSL_malloc((int)num); |
0f113f3e MC |
367 | if (p2 == NULL) { |
368 | if (p1 != ctx->ibuf) | |
369 | OPENSSL_free(p1); | |
370 | goto malloc_error; | |
371 | } | |
372 | } | |
373 | if (ctx->ibuf != p1) { | |
374 | OPENSSL_free(ctx->ibuf); | |
375 | ctx->ibuf = p1; | |
376 | ctx->ibuf_off = 0; | |
377 | ctx->ibuf_len = 0; | |
378 | ctx->ibuf_size = ibs; | |
379 | } | |
380 | if (ctx->obuf != p2) { | |
381 | OPENSSL_free(ctx->obuf); | |
382 | ctx->obuf = p2; | |
383 | ctx->obuf_off = 0; | |
384 | ctx->obuf_len = 0; | |
385 | ctx->obuf_size = obs; | |
386 | } | |
387 | break; | |
388 | case BIO_C_DO_STATE_MACHINE: | |
389 | if (b->next_bio == NULL) | |
390 | return (0); | |
391 | BIO_clear_retry_flags(b); | |
392 | ret = BIO_ctrl(b->next_bio, cmd, num, ptr); | |
393 | BIO_copy_next_retry(b); | |
394 | break; | |
395 | ||
396 | case BIO_CTRL_FLUSH: | |
397 | if (b->next_bio == NULL) | |
398 | return (0); | |
399 | if (ctx->obuf_len <= 0) { | |
400 | ret = BIO_ctrl(b->next_bio, cmd, num, ptr); | |
401 | break; | |
402 | } | |
403 | ||
404 | for (;;) { | |
405 | BIO_clear_retry_flags(b); | |
406 | if (ctx->obuf_len > 0) { | |
407 | r = BIO_write(b->next_bio, | |
408 | &(ctx->obuf[ctx->obuf_off]), ctx->obuf_len); | |
0f113f3e MC |
409 | BIO_copy_next_retry(b); |
410 | if (r <= 0) | |
411 | return ((long)r); | |
412 | ctx->obuf_off += r; | |
413 | ctx->obuf_len -= r; | |
414 | } else { | |
415 | ctx->obuf_len = 0; | |
416 | ctx->obuf_off = 0; | |
417 | ret = 1; | |
418 | break; | |
419 | } | |
420 | } | |
421 | ret = BIO_ctrl(b->next_bio, cmd, num, ptr); | |
422 | break; | |
423 | case BIO_CTRL_DUP: | |
424 | dbio = (BIO *)ptr; | |
425 | if (!BIO_set_read_buffer_size(dbio, ctx->ibuf_size) || | |
426 | !BIO_set_write_buffer_size(dbio, ctx->obuf_size)) | |
427 | ret = 0; | |
428 | break; | |
429 | default: | |
430 | if (b->next_bio == NULL) | |
431 | return (0); | |
432 | ret = BIO_ctrl(b->next_bio, cmd, num, ptr); | |
433 | break; | |
434 | } | |
435 | return (ret); | |
436 | malloc_error: | |
437 | BIOerr(BIO_F_BUFFER_CTRL, ERR_R_MALLOC_FAILURE); | |
438 | return (0); | |
439 | } | |
d02b48c6 | 440 | |
13083215 | 441 | static long buffer_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp) |
0f113f3e MC |
442 | { |
443 | long ret = 1; | |
444 | ||
445 | if (b->next_bio == NULL) | |
446 | return (0); | |
447 | switch (cmd) { | |
448 | default: | |
449 | ret = BIO_callback_ctrl(b->next_bio, cmd, fp); | |
450 | break; | |
451 | } | |
452 | return (ret); | |
453 | } | |
d3442bc7 | 454 | |
6b691a5c | 455 | static int buffer_gets(BIO *b, char *buf, int size) |
0f113f3e MC |
456 | { |
457 | BIO_F_BUFFER_CTX *ctx; | |
458 | int num = 0, i, flag; | |
459 | char *p; | |
460 | ||
461 | ctx = (BIO_F_BUFFER_CTX *)b->ptr; | |
462 | size--; /* reserve space for a '\0' */ | |
463 | BIO_clear_retry_flags(b); | |
464 | ||
465 | for (;;) { | |
466 | if (ctx->ibuf_len > 0) { | |
467 | p = &(ctx->ibuf[ctx->ibuf_off]); | |
468 | flag = 0; | |
469 | for (i = 0; (i < ctx->ibuf_len) && (i < size); i++) { | |
470 | *(buf++) = p[i]; | |
471 | if (p[i] == '\n') { | |
472 | flag = 1; | |
473 | i++; | |
474 | break; | |
475 | } | |
476 | } | |
477 | num += i; | |
478 | size -= i; | |
479 | ctx->ibuf_len -= i; | |
480 | ctx->ibuf_off += i; | |
481 | if (flag || size == 0) { | |
482 | *buf = '\0'; | |
483 | return (num); | |
484 | } | |
485 | } else { /* read another chunk */ | |
486 | ||
487 | i = BIO_read(b->next_bio, ctx->ibuf, ctx->ibuf_size); | |
488 | if (i <= 0) { | |
489 | BIO_copy_next_retry(b); | |
490 | *buf = '\0'; | |
491 | if (i < 0) | |
492 | return ((num > 0) ? num : i); | |
493 | if (i == 0) | |
494 | return (num); | |
495 | } | |
496 | ctx->ibuf_len = i; | |
497 | ctx->ibuf_off = 0; | |
498 | } | |
499 | } | |
500 | } | |
d02b48c6 | 501 | |
0e1c0612 | 502 | static int buffer_puts(BIO *b, const char *str) |
0f113f3e MC |
503 | { |
504 | return (buffer_write(b, str, strlen(str))); | |
505 | } |