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-rw-r--r--src/lib/libcrypto/bio/bf_buff.c511
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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/* crypto/bio/bf_buff.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#include <stdio.h>
60#include <errno.h>
61#include "cryptlib.h"
62#include <openssl/bio.h>
63#include <openssl/evp.h>
64
65static int buffer_write(BIO *h, const char *buf,int num);
66static int buffer_read(BIO *h, char *buf, int size);
67static int buffer_puts(BIO *h, const char *str);
68static int buffer_gets(BIO *h, char *str, int size);
69static long buffer_ctrl(BIO *h, int cmd, long arg1, void *arg2);
70static int buffer_new(BIO *h);
71static int buffer_free(BIO *data);
72static long buffer_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp);
73#define DEFAULT_BUFFER_SIZE 4096
74
75static BIO_METHOD methods_buffer=
76 {
77 BIO_TYPE_BUFFER,
78 "buffer",
79 buffer_write,
80 buffer_read,
81 buffer_puts,
82 buffer_gets,
83 buffer_ctrl,
84 buffer_new,
85 buffer_free,
86 buffer_callback_ctrl,
87 };
88
89BIO_METHOD *BIO_f_buffer(void)
90 {
91 return(&methods_buffer);
92 }
93
94static int buffer_new(BIO *bi)
95 {
96 BIO_F_BUFFER_CTX *ctx;
97
98 ctx=(BIO_F_BUFFER_CTX *)OPENSSL_malloc(sizeof(BIO_F_BUFFER_CTX));
99 if (ctx == NULL) return(0);
100 ctx->ibuf=(char *)OPENSSL_malloc(DEFAULT_BUFFER_SIZE);
101 if (ctx->ibuf == NULL) { OPENSSL_free(ctx); return(0); }
102 ctx->obuf=(char *)OPENSSL_malloc(DEFAULT_BUFFER_SIZE);
103 if (ctx->obuf == NULL) { OPENSSL_free(ctx->ibuf); OPENSSL_free(ctx); return(0); }
104 ctx->ibuf_size=DEFAULT_BUFFER_SIZE;
105 ctx->obuf_size=DEFAULT_BUFFER_SIZE;
106 ctx->ibuf_len=0;
107 ctx->ibuf_off=0;
108 ctx->obuf_len=0;
109 ctx->obuf_off=0;
110
111 bi->init=1;
112 bi->ptr=(char *)ctx;
113 bi->flags=0;
114 return(1);
115 }
116
117static int buffer_free(BIO *a)
118 {
119 BIO_F_BUFFER_CTX *b;
120
121 if (a == NULL) return(0);
122 b=(BIO_F_BUFFER_CTX *)a->ptr;
123 if (b->ibuf != NULL) OPENSSL_free(b->ibuf);
124 if (b->obuf != NULL) OPENSSL_free(b->obuf);
125 OPENSSL_free(a->ptr);
126 a->ptr=NULL;
127 a->init=0;
128 a->flags=0;
129 return(1);
130 }
131
132static int buffer_read(BIO *b, char *out, int outl)
133 {
134 int i,num=0;
135 BIO_F_BUFFER_CTX *ctx;
136
137 if (out == NULL) return(0);
138 ctx=(BIO_F_BUFFER_CTX *)b->ptr;
139
140 if ((ctx == NULL) || (b->next_bio == NULL)) return(0);
141 num=0;
142 BIO_clear_retry_flags(b);
143
144start:
145 i=ctx->ibuf_len;
146 /* If there is stuff left over, grab it */
147 if (i != 0)
148 {
149 if (i > outl) i=outl;
150 memcpy(out,&(ctx->ibuf[ctx->ibuf_off]),i);
151 ctx->ibuf_off+=i;
152 ctx->ibuf_len-=i;
153 num+=i;
154 if (outl == i) return(num);
155 outl-=i;
156 out+=i;
157 }
158
159 /* We may have done a partial read. try to do more.
160 * We have nothing in the buffer.
161 * If we get an error and have read some data, just return it
162 * and let them retry to get the error again.
163 * copy direct to parent address space */
164 if (outl > ctx->ibuf_size)
165 {
166 for (;;)
167 {
168 i=BIO_read(b->next_bio,out,outl);
169 if (i <= 0)
170 {
171 BIO_copy_next_retry(b);
172 if (i < 0) return((num > 0)?num:i);
173 if (i == 0) return(num);
174 }
175 num+=i;
176 if (outl == i) return(num);
177 out+=i;
178 outl-=i;
179 }
180 }
181 /* else */
182
183 /* we are going to be doing some buffering */
184 i=BIO_read(b->next_bio,ctx->ibuf,ctx->ibuf_size);
185 if (i <= 0)
186 {
187 BIO_copy_next_retry(b);
188 if (i < 0) return((num > 0)?num:i);
189 if (i == 0) return(num);
190 }
191 ctx->ibuf_off=0;
192 ctx->ibuf_len=i;
193
194 /* Lets re-read using ourselves :-) */
195 goto start;
196 }
197
198static int buffer_write(BIO *b, const char *in, int inl)
199 {
200 int i,num=0;
201 BIO_F_BUFFER_CTX *ctx;
202
203 if ((in == NULL) || (inl <= 0)) return(0);
204 ctx=(BIO_F_BUFFER_CTX *)b->ptr;
205 if ((ctx == NULL) || (b->next_bio == NULL)) return(0);
206
207 BIO_clear_retry_flags(b);
208start:
209 i=ctx->obuf_size-(ctx->obuf_len+ctx->obuf_off);
210 /* add to buffer and return */
211 if (i >= inl)
212 {
213 memcpy(&(ctx->obuf[ctx->obuf_len]),in,inl);
214 ctx->obuf_len+=inl;
215 return(num+inl);
216 }
217 /* else */
218 /* stuff already in buffer, so add to it first, then flush */
219 if (ctx->obuf_len != 0)
220 {
221 if (i > 0) /* lets fill it up if we can */
222 {
223 memcpy(&(ctx->obuf[ctx->obuf_len]),in,i);
224 in+=i;
225 inl-=i;
226 num+=i;
227 ctx->obuf_len+=i;
228 }
229 /* we now have a full buffer needing flushing */
230 for (;;)
231 {
232 i=BIO_write(b->next_bio,&(ctx->obuf[ctx->obuf_off]),
233 ctx->obuf_len);
234 if (i <= 0)
235 {
236 BIO_copy_next_retry(b);
237
238 if (i < 0) return((num > 0)?num:i);
239 if (i == 0) return(num);
240 }
241 ctx->obuf_off+=i;
242 ctx->obuf_len-=i;
243 if (ctx->obuf_len == 0) break;
244 }
245 }
246 /* we only get here if the buffer has been flushed and we
247 * still have stuff to write */
248 ctx->obuf_off=0;
249
250 /* we now have inl bytes to write */
251 while (inl >= ctx->obuf_size)
252 {
253 i=BIO_write(b->next_bio,in,inl);
254 if (i <= 0)
255 {
256 BIO_copy_next_retry(b);
257 if (i < 0) return((num > 0)?num:i);
258 if (i == 0) return(num);
259 }
260 num+=i;
261 in+=i;
262 inl-=i;
263 if (inl == 0) return(num);
264 }
265
266 /* copy the rest into the buffer since we have only a small
267 * amount left */
268 goto start;
269 }
270
271static long buffer_ctrl(BIO *b, int cmd, long num, void *ptr)
272 {
273 BIO *dbio;
274 BIO_F_BUFFER_CTX *ctx;
275 long ret=1;
276 char *p1,*p2;
277 int r,i,*ip;
278 int ibs,obs;
279
280 ctx=(BIO_F_BUFFER_CTX *)b->ptr;
281
282 switch (cmd)
283 {
284 case BIO_CTRL_RESET:
285 ctx->ibuf_off=0;
286 ctx->ibuf_len=0;
287 ctx->obuf_off=0;
288 ctx->obuf_len=0;
289 if (b->next_bio == NULL) return(0);
290 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
291 break;
292 case BIO_CTRL_INFO:
293 ret=(long)ctx->obuf_len;
294 break;
295 case BIO_C_GET_BUFF_NUM_LINES:
296 ret=0;
297 p1=ctx->ibuf;
298 for (i=ctx->ibuf_off; i<ctx->ibuf_len; i++)
299 {
300 if (p1[i] == '\n') ret++;
301 }
302 break;
303 case BIO_CTRL_WPENDING:
304 ret=(long)ctx->obuf_len;
305 if (ret == 0)
306 {
307 if (b->next_bio == NULL) return(0);
308 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
309 }
310 break;
311 case BIO_CTRL_PENDING:
312 ret=(long)ctx->ibuf_len;
313 if (ret == 0)
314 {
315 if (b->next_bio == NULL) return(0);
316 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
317 }
318 break;
319 case BIO_C_SET_BUFF_READ_DATA:
320 if (num > ctx->ibuf_size)
321 {
322 p1=OPENSSL_malloc((int)num);
323 if (p1 == NULL) goto malloc_error;
324 if (ctx->ibuf != NULL) OPENSSL_free(ctx->ibuf);
325 ctx->ibuf=p1;
326 }
327 ctx->ibuf_off=0;
328 ctx->ibuf_len=(int)num;
329 memcpy(ctx->ibuf,ptr,(int)num);
330 ret=1;
331 break;
332 case BIO_C_SET_BUFF_SIZE:
333 if (ptr != NULL)
334 {
335 ip=(int *)ptr;
336 if (*ip == 0)
337 {
338 ibs=(int)num;
339 obs=ctx->obuf_size;
340 }
341 else /* if (*ip == 1) */
342 {
343 ibs=ctx->ibuf_size;
344 obs=(int)num;
345 }
346 }
347 else
348 {
349 ibs=(int)num;
350 obs=(int)num;
351 }
352 p1=ctx->ibuf;
353 p2=ctx->obuf;
354 if ((ibs > DEFAULT_BUFFER_SIZE) && (ibs != ctx->ibuf_size))
355 {
356 p1=(char *)OPENSSL_malloc((int)num);
357 if (p1 == NULL) goto malloc_error;
358 }
359 if ((obs > DEFAULT_BUFFER_SIZE) && (obs != ctx->obuf_size))
360 {
361 p2=(char *)OPENSSL_malloc((int)num);
362 if (p2 == NULL)
363 {
364 if (p1 != ctx->ibuf) OPENSSL_free(p1);
365 goto malloc_error;
366 }
367 }
368 if (ctx->ibuf != p1)
369 {
370 OPENSSL_free(ctx->ibuf);
371 ctx->ibuf=p1;
372 ctx->ibuf_off=0;
373 ctx->ibuf_len=0;
374 ctx->ibuf_size=ibs;
375 }
376 if (ctx->obuf != p2)
377 {
378 OPENSSL_free(ctx->obuf);
379 ctx->obuf=p2;
380 ctx->obuf_off=0;
381 ctx->obuf_len=0;
382 ctx->obuf_size=obs;
383 }
384 break;
385 case BIO_C_DO_STATE_MACHINE:
386 if (b->next_bio == NULL) return(0);
387 BIO_clear_retry_flags(b);
388 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
389 BIO_copy_next_retry(b);
390 break;
391
392 case BIO_CTRL_FLUSH:
393 if (b->next_bio == NULL) return(0);
394 if (ctx->obuf_len <= 0)
395 {
396 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
397 break;
398 }
399
400 for (;;)
401 {
402 BIO_clear_retry_flags(b);
403 if (ctx->obuf_len > ctx->obuf_off)
404 {
405 r=BIO_write(b->next_bio,
406 &(ctx->obuf[ctx->obuf_off]),
407 ctx->obuf_len-ctx->obuf_off);
408#if 0
409fprintf(stderr,"FLUSH [%3d] %3d -> %3d\n",ctx->obuf_off,ctx->obuf_len-ctx->obuf_off,r);
410#endif
411 BIO_copy_next_retry(b);
412 if (r <= 0) return((long)r);
413 ctx->obuf_off+=r;
414 }
415 else
416 {
417 ctx->obuf_len=0;
418 ctx->obuf_off=0;
419 ret=1;
420 break;
421 }
422 }
423 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
424 break;
425 case BIO_CTRL_DUP:
426 dbio=(BIO *)ptr;
427 if ( !BIO_set_read_buffer_size(dbio,ctx->ibuf_size) ||
428 !BIO_set_write_buffer_size(dbio,ctx->obuf_size))
429 ret=0;
430 break;
431 default:
432 if (b->next_bio == NULL) return(0);
433 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
434 break;
435 }
436 return(ret);
437malloc_error:
438 BIOerr(BIO_F_BUFFER_CTRL,ERR_R_MALLOC_FAILURE);
439 return(0);
440 }
441
442static long buffer_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
443 {
444 long ret=1;
445
446 if (b->next_bio == NULL) return(0);
447 switch (cmd)
448 {
449 default:
450 ret=BIO_callback_ctrl(b->next_bio,cmd,fp);
451 break;
452 }
453 return(ret);
454 }
455
456static int buffer_gets(BIO *b, char *buf, int size)
457 {
458 BIO_F_BUFFER_CTX *ctx;
459 int num=0,i,flag;
460 char *p;
461
462 ctx=(BIO_F_BUFFER_CTX *)b->ptr;
463 size--; /* reserve space for a '\0' */
464 BIO_clear_retry_flags(b);
465
466 for (;;)
467 {
468 if (ctx->ibuf_len > 0)
469 {
470 p= &(ctx->ibuf[ctx->ibuf_off]);
471 flag=0;
472 for (i=0; (i<ctx->ibuf_len) && (i<size); i++)
473 {
474 *(buf++)=p[i];
475 if (p[i] == '\n')
476 {
477 flag=1;
478 i++;
479 break;
480 }
481 }
482 num+=i;
483 size-=i;
484 ctx->ibuf_len-=i;
485 ctx->ibuf_off+=i;
486 if ((flag) || (i == size))
487 {
488 *buf='\0';
489 return(num);
490 }
491 }
492 else /* read another chunk */
493 {
494 i=BIO_read(b->next_bio,ctx->ibuf,ctx->ibuf_size);
495 if (i <= 0)
496 {
497 BIO_copy_next_retry(b);
498 if (i < 0) return((num > 0)?num:i);
499 if (i == 0) return(num);
500 }
501 ctx->ibuf_len=i;
502 ctx->ibuf_off=0;
503 }
504 }
505 }
506
507static int buffer_puts(BIO *b, const char *str)
508 {
509 return(buffer_write(b,str,strlen(str)));
510 }
511
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