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