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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. | |
40720ce3 | 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). | |
40720ce3 | 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. | |
40720ce3 | 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 :-). | |
40720ce3 | 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)" | |
40720ce3 | 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. | |
40720ce3 | 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> | |
61 | #include "cryptlib.h" | |
ec577822 | 62 | #include <openssl/bio.h> |
d02b48c6 | 63 | |
40720ce3 | 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); |
40720ce3 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) |
40720ce3 MC |
88 | { |
89 | return (&methods_buffer); | |
90 | } | |
d02b48c6 | 91 | |
6b691a5c | 92 | static int buffer_new(BIO *bi) |
40720ce3 MC |
93 | { |
94 | BIO_F_BUFFER_CTX *ctx; | |
95 | ||
96 | ctx = (BIO_F_BUFFER_CTX *)OPENSSL_malloc(sizeof(BIO_F_BUFFER_CTX)); | |
97 | if (ctx == NULL) | |
98 | return (0); | |
99 | ctx->ibuf = (char *)OPENSSL_malloc(DEFAULT_BUFFER_SIZE); | |
100 | if (ctx->ibuf == NULL) { | |
101 | OPENSSL_free(ctx); | |
102 | return (0); | |
103 | } | |
104 | ctx->obuf = (char *)OPENSSL_malloc(DEFAULT_BUFFER_SIZE); | |
105 | if (ctx->obuf == NULL) { | |
106 | OPENSSL_free(ctx->ibuf); | |
107 | OPENSSL_free(ctx); | |
108 | return (0); | |
109 | } | |
110 | ctx->ibuf_size = DEFAULT_BUFFER_SIZE; | |
111 | ctx->obuf_size = DEFAULT_BUFFER_SIZE; | |
112 | ctx->ibuf_len = 0; | |
113 | ctx->ibuf_off = 0; | |
114 | ctx->obuf_len = 0; | |
115 | ctx->obuf_off = 0; | |
116 | ||
117 | bi->init = 1; | |
118 | bi->ptr = (char *)ctx; | |
119 | bi->flags = 0; | |
120 | return (1); | |
121 | } | |
d02b48c6 | 122 | |
6b691a5c | 123 | static int buffer_free(BIO *a) |
40720ce3 MC |
124 | { |
125 | BIO_F_BUFFER_CTX *b; | |
126 | ||
127 | if (a == NULL) | |
128 | return (0); | |
129 | b = (BIO_F_BUFFER_CTX *)a->ptr; | |
130 | if (b->ibuf != NULL) | |
131 | OPENSSL_free(b->ibuf); | |
132 | if (b->obuf != NULL) | |
133 | OPENSSL_free(b->obuf); | |
134 | OPENSSL_free(a->ptr); | |
135 | a->ptr = NULL; | |
136 | a->init = 0; | |
137 | a->flags = 0; | |
138 | return (1); | |
139 | } | |
140 | ||
6b691a5c | 141 | static int buffer_read(BIO *b, char *out, int outl) |
40720ce3 MC |
142 | { |
143 | int i, num = 0; | |
144 | BIO_F_BUFFER_CTX *ctx; | |
145 | ||
146 | if (out == NULL) | |
147 | return (0); | |
148 | ctx = (BIO_F_BUFFER_CTX *)b->ptr; | |
149 | ||
150 | if ((ctx == NULL) || (b->next_bio == NULL)) | |
151 | return (0); | |
152 | num = 0; | |
153 | BIO_clear_retry_flags(b); | |
154 | ||
155 | start: | |
156 | i = ctx->ibuf_len; | |
157 | /* If there is stuff left over, grab it */ | |
158 | if (i != 0) { | |
159 | if (i > outl) | |
160 | i = outl; | |
161 | memcpy(out, &(ctx->ibuf[ctx->ibuf_off]), i); | |
162 | ctx->ibuf_off += i; | |
163 | ctx->ibuf_len -= i; | |
164 | num += i; | |
165 | if (outl == i) | |
166 | return (num); | |
167 | outl -= i; | |
168 | out += i; | |
169 | } | |
170 | ||
171 | /* | |
172 | * We may have done a partial read. try to do more. We have nothing in | |
173 | * the buffer. If we get an error and have read some data, just return it | |
174 | * and let them retry to get the error again. copy direct to parent | |
175 | * address space | |
176 | */ | |
177 | if (outl > ctx->ibuf_size) { | |
178 | for (;;) { | |
179 | i = BIO_read(b->next_bio, out, outl); | |
180 | if (i <= 0) { | |
181 | BIO_copy_next_retry(b); | |
182 | if (i < 0) | |
183 | return ((num > 0) ? num : i); | |
184 | if (i == 0) | |
185 | return (num); | |
186 | } | |
187 | num += i; | |
188 | if (outl == i) | |
189 | return (num); | |
190 | out += i; | |
191 | outl -= i; | |
192 | } | |
193 | } | |
194 | /* else */ | |
195 | ||
196 | /* we are going to be doing some buffering */ | |
197 | i = BIO_read(b->next_bio, ctx->ibuf, ctx->ibuf_size); | |
198 | if (i <= 0) { | |
199 | BIO_copy_next_retry(b); | |
200 | if (i < 0) | |
201 | return ((num > 0) ? num : i); | |
202 | if (i == 0) | |
203 | return (num); | |
204 | } | |
205 | ctx->ibuf_off = 0; | |
206 | ctx->ibuf_len = i; | |
207 | ||
208 | /* Lets re-read using ourselves :-) */ | |
209 | goto start; | |
210 | } | |
d02b48c6 | 211 | |
0e1c0612 | 212 | static int buffer_write(BIO *b, const char *in, int inl) |
40720ce3 MC |
213 | { |
214 | int i, num = 0; | |
215 | BIO_F_BUFFER_CTX *ctx; | |
216 | ||
217 | if ((in == NULL) || (inl <= 0)) | |
218 | return (0); | |
219 | ctx = (BIO_F_BUFFER_CTX *)b->ptr; | |
220 | if ((ctx == NULL) || (b->next_bio == NULL)) | |
221 | return (0); | |
222 | ||
223 | BIO_clear_retry_flags(b); | |
224 | start: | |
225 | i = ctx->obuf_size - (ctx->obuf_len + ctx->obuf_off); | |
226 | /* add to buffer and return */ | |
227 | if (i >= inl) { | |
228 | memcpy(&(ctx->obuf[ctx->obuf_off + ctx->obuf_len]), in, inl); | |
229 | ctx->obuf_len += inl; | |
230 | return (num + inl); | |
231 | } | |
232 | /* else */ | |
233 | /* stuff already in buffer, so add to it first, then flush */ | |
234 | if (ctx->obuf_len != 0) { | |
235 | if (i > 0) { /* lets fill it up if we can */ | |
236 | memcpy(&(ctx->obuf[ctx->obuf_off + ctx->obuf_len]), in, i); | |
237 | in += i; | |
238 | inl -= i; | |
239 | num += i; | |
240 | ctx->obuf_len += i; | |
241 | } | |
242 | /* we now have a full buffer needing flushing */ | |
243 | for (;;) { | |
244 | i = BIO_write(b->next_bio, &(ctx->obuf[ctx->obuf_off]), | |
245 | ctx->obuf_len); | |
246 | if (i <= 0) { | |
247 | BIO_copy_next_retry(b); | |
248 | ||
249 | if (i < 0) | |
250 | return ((num > 0) ? num : i); | |
251 | if (i == 0) | |
252 | return (num); | |
253 | } | |
254 | ctx->obuf_off += i; | |
255 | ctx->obuf_len -= i; | |
256 | if (ctx->obuf_len == 0) | |
257 | break; | |
258 | } | |
259 | } | |
260 | /* | |
261 | * we only get here if the buffer has been flushed and we still have | |
262 | * stuff to write | |
263 | */ | |
264 | ctx->obuf_off = 0; | |
265 | ||
266 | /* we now have inl bytes to write */ | |
267 | while (inl >= ctx->obuf_size) { | |
268 | i = BIO_write(b->next_bio, in, inl); | |
269 | if (i <= 0) { | |
270 | BIO_copy_next_retry(b); | |
271 | if (i < 0) | |
272 | return ((num > 0) ? num : i); | |
273 | if (i == 0) | |
274 | return (num); | |
275 | } | |
276 | num += i; | |
277 | in += i; | |
278 | inl -= i; | |
279 | if (inl == 0) | |
280 | return (num); | |
281 | } | |
282 | ||
283 | /* | |
284 | * copy the rest into the buffer since we have only a small amount left | |
285 | */ | |
286 | goto start; | |
287 | } | |
d02b48c6 | 288 | |
0e1c0612 | 289 | static long buffer_ctrl(BIO *b, int cmd, long num, void *ptr) |
40720ce3 MC |
290 | { |
291 | BIO *dbio; | |
292 | BIO_F_BUFFER_CTX *ctx; | |
293 | long ret = 1; | |
294 | char *p1, *p2; | |
295 | int r, i, *ip; | |
296 | int ibs, obs; | |
297 | ||
298 | ctx = (BIO_F_BUFFER_CTX *)b->ptr; | |
299 | ||
300 | switch (cmd) { | |
301 | case BIO_CTRL_RESET: | |
302 | ctx->ibuf_off = 0; | |
303 | ctx->ibuf_len = 0; | |
304 | ctx->obuf_off = 0; | |
305 | ctx->obuf_len = 0; | |
306 | if (b->next_bio == NULL) | |
307 | return (0); | |
308 | ret = BIO_ctrl(b->next_bio, cmd, num, ptr); | |
309 | break; | |
310 | case BIO_CTRL_INFO: | |
311 | ret = (long)ctx->obuf_len; | |
312 | break; | |
313 | case BIO_C_GET_BUFF_NUM_LINES: | |
314 | ret = 0; | |
315 | p1 = ctx->ibuf; | |
316 | for (i = 0; i < ctx->ibuf_len; i++) { | |
317 | if (p1[ctx->ibuf_off + i] == '\n') | |
318 | ret++; | |
319 | } | |
320 | break; | |
321 | case BIO_CTRL_WPENDING: | |
322 | ret = (long)ctx->obuf_len; | |
323 | if (ret == 0) { | |
324 | if (b->next_bio == NULL) | |
325 | return (0); | |
326 | ret = BIO_ctrl(b->next_bio, cmd, num, ptr); | |
327 | } | |
328 | break; | |
329 | case BIO_CTRL_PENDING: | |
330 | ret = (long)ctx->ibuf_len; | |
331 | if (ret == 0) { | |
332 | if (b->next_bio == NULL) | |
333 | return (0); | |
334 | ret = BIO_ctrl(b->next_bio, cmd, num, ptr); | |
335 | } | |
336 | break; | |
337 | case BIO_C_SET_BUFF_READ_DATA: | |
338 | if (num > ctx->ibuf_size) { | |
339 | p1 = OPENSSL_malloc((int)num); | |
340 | if (p1 == NULL) | |
341 | goto malloc_error; | |
342 | if (ctx->ibuf != NULL) | |
343 | OPENSSL_free(ctx->ibuf); | |
344 | ctx->ibuf = p1; | |
345 | } | |
346 | ctx->ibuf_off = 0; | |
347 | ctx->ibuf_len = (int)num; | |
348 | memcpy(ctx->ibuf, ptr, (int)num); | |
349 | ret = 1; | |
350 | break; | |
351 | case BIO_C_SET_BUFF_SIZE: | |
352 | if (ptr != NULL) { | |
353 | ip = (int *)ptr; | |
354 | if (*ip == 0) { | |
355 | ibs = (int)num; | |
356 | obs = ctx->obuf_size; | |
357 | } else { /* if (*ip == 1) */ | |
358 | ||
359 | ibs = ctx->ibuf_size; | |
360 | obs = (int)num; | |
361 | } | |
362 | } else { | |
363 | ibs = (int)num; | |
364 | obs = (int)num; | |
365 | } | |
366 | p1 = ctx->ibuf; | |
367 | p2 = ctx->obuf; | |
368 | if ((ibs > DEFAULT_BUFFER_SIZE) && (ibs != ctx->ibuf_size)) { | |
369 | p1 = (char *)OPENSSL_malloc((int)num); | |
370 | if (p1 == NULL) | |
371 | goto malloc_error; | |
372 | } | |
373 | if ((obs > DEFAULT_BUFFER_SIZE) && (obs != ctx->obuf_size)) { | |
374 | p2 = (char *)OPENSSL_malloc((int)num); | |
375 | if (p2 == NULL) { | |
376 | if (p1 != ctx->ibuf) | |
377 | OPENSSL_free(p1); | |
378 | goto malloc_error; | |
379 | } | |
380 | } | |
381 | if (ctx->ibuf != p1) { | |
382 | OPENSSL_free(ctx->ibuf); | |
383 | ctx->ibuf = p1; | |
384 | ctx->ibuf_off = 0; | |
385 | ctx->ibuf_len = 0; | |
386 | ctx->ibuf_size = ibs; | |
387 | } | |
388 | if (ctx->obuf != p2) { | |
389 | OPENSSL_free(ctx->obuf); | |
390 | ctx->obuf = p2; | |
391 | ctx->obuf_off = 0; | |
392 | ctx->obuf_len = 0; | |
393 | ctx->obuf_size = obs; | |
394 | } | |
395 | break; | |
396 | case BIO_C_DO_STATE_MACHINE: | |
397 | if (b->next_bio == NULL) | |
398 | return (0); | |
399 | BIO_clear_retry_flags(b); | |
400 | ret = BIO_ctrl(b->next_bio, cmd, num, ptr); | |
401 | BIO_copy_next_retry(b); | |
402 | break; | |
403 | ||
404 | case BIO_CTRL_FLUSH: | |
405 | if (b->next_bio == NULL) | |
406 | return (0); | |
407 | if (ctx->obuf_len <= 0) { | |
408 | ret = BIO_ctrl(b->next_bio, cmd, num, ptr); | |
409 | break; | |
410 | } | |
411 | ||
412 | for (;;) { | |
413 | BIO_clear_retry_flags(b); | |
414 | if (ctx->obuf_len > 0) { | |
415 | r = BIO_write(b->next_bio, | |
416 | &(ctx->obuf[ctx->obuf_off]), ctx->obuf_len); | |
d02b48c6 | 417 | #if 0 |
40720ce3 MC |
418 | fprintf(stderr, "FLUSH [%3d] %3d -> %3d\n", ctx->obuf_off, |
419 | ctx->obuf_len, r); | |
d02b48c6 | 420 | #endif |
40720ce3 MC |
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 | ret = 1; | |
430 | break; | |
431 | } | |
432 | } | |
433 | ret = BIO_ctrl(b->next_bio, cmd, num, ptr); | |
434 | break; | |
435 | case BIO_CTRL_DUP: | |
436 | dbio = (BIO *)ptr; | |
437 | if (!BIO_set_read_buffer_size(dbio, ctx->ibuf_size) || | |
438 | !BIO_set_write_buffer_size(dbio, ctx->obuf_size)) | |
439 | ret = 0; | |
440 | break; | |
441 | default: | |
442 | if (b->next_bio == NULL) | |
443 | return (0); | |
444 | ret = BIO_ctrl(b->next_bio, cmd, num, ptr); | |
445 | break; | |
446 | } | |
447 | return (ret); | |
448 | malloc_error: | |
449 | BIOerr(BIO_F_BUFFER_CTRL, ERR_R_MALLOC_FAILURE); | |
450 | return (0); | |
451 | } | |
d02b48c6 | 452 | |
13083215 | 453 | static long buffer_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp) |
40720ce3 MC |
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 | } | |
d3442bc7 | 466 | |
6b691a5c | 467 | static int buffer_gets(BIO *b, char *buf, int size) |
40720ce3 MC |
468 | { |
469 | BIO_F_BUFFER_CTX *ctx; | |
470 | int num = 0, i, flag; | |
471 | char *p; | |
472 | ||
473 | ctx = (BIO_F_BUFFER_CTX *)b->ptr; | |
474 | size--; /* reserve space for a '\0' */ | |
475 | BIO_clear_retry_flags(b); | |
476 | ||
477 | for (;;) { | |
478 | if (ctx->ibuf_len > 0) { | |
479 | p = &(ctx->ibuf[ctx->ibuf_off]); | |
480 | flag = 0; | |
481 | for (i = 0; (i < ctx->ibuf_len) && (i < size); i++) { | |
482 | *(buf++) = p[i]; | |
483 | if (p[i] == '\n') { | |
484 | flag = 1; | |
485 | i++; | |
486 | break; | |
487 | } | |
488 | } | |
489 | num += i; | |
490 | size -= i; | |
491 | ctx->ibuf_len -= i; | |
492 | ctx->ibuf_off += i; | |
493 | if (flag || size == 0) { | |
494 | *buf = '\0'; | |
495 | return (num); | |
496 | } | |
497 | } else { /* read another chunk */ | |
498 | ||
499 | i = BIO_read(b->next_bio, ctx->ibuf, ctx->ibuf_size); | |
500 | if (i <= 0) { | |
501 | BIO_copy_next_retry(b); | |
502 | *buf = '\0'; | |
503 | if (i < 0) | |
504 | return ((num > 0) ? num : i); | |
505 | if (i == 0) | |
506 | return (num); | |
507 | } | |
508 | ctx->ibuf_len = i; | |
509 | ctx->ibuf_off = 0; | |
510 | } | |
511 | } | |
512 | } | |
d02b48c6 | 513 | |
0e1c0612 | 514 | static int buffer_puts(BIO *b, const char *str) |
40720ce3 MC |
515 | { |
516 | return (buffer_write(b, str, strlen(str))); | |
517 | } |