2 * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
13 #include "internal/cryptlib.h"
15 static int buffer_write(BIO *h, const char *buf, int num);
16 static int buffer_read(BIO *h, char *buf, int size);
17 static int buffer_puts(BIO *h, const char *str);
18 static int buffer_gets(BIO *h, char *str, int size);
19 static long buffer_ctrl(BIO *h, int cmd, long arg1, void *arg2);
20 static int buffer_new(BIO *h);
21 static int buffer_free(BIO *data);
22 static long buffer_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp);
23 #define DEFAULT_BUFFER_SIZE 4096
25 static const BIO_METHOD methods_buffer = {
28 /* TODO: Convert to new style write function */
31 /* TODO: Convert to new style read function */
42 const BIO_METHOD *BIO_f_buffer(void)
44 return (&methods_buffer);
47 static int buffer_new(BIO *bi)
49 BIO_F_BUFFER_CTX *ctx = OPENSSL_zalloc(sizeof(*ctx));
53 ctx->ibuf_size = DEFAULT_BUFFER_SIZE;
54 ctx->ibuf = OPENSSL_malloc(DEFAULT_BUFFER_SIZE);
55 if (ctx->ibuf == NULL) {
59 ctx->obuf_size = DEFAULT_BUFFER_SIZE;
60 ctx->obuf = OPENSSL_malloc(DEFAULT_BUFFER_SIZE);
61 if (ctx->obuf == NULL) {
62 OPENSSL_free(ctx->ibuf);
68 bi->ptr = (char *)ctx;
73 static int buffer_free(BIO *a)
79 b = (BIO_F_BUFFER_CTX *)a->ptr;
80 OPENSSL_free(b->ibuf);
81 OPENSSL_free(b->obuf);
89 static int buffer_read(BIO *b, char *out, int outl)
92 BIO_F_BUFFER_CTX *ctx;
96 ctx = (BIO_F_BUFFER_CTX *)b->ptr;
98 if ((ctx == NULL) || (b->next_bio == NULL))
101 BIO_clear_retry_flags(b);
105 /* If there is stuff left over, grab it */
109 memcpy(out, &(ctx->ibuf[ctx->ibuf_off]), i);
120 * We may have done a partial read. try to do more. We have nothing in
121 * the buffer. If we get an error and have read some data, just return it
122 * and let them retry to get the error again. copy direct to parent
125 if (outl > ctx->ibuf_size) {
127 i = BIO_read(b->next_bio, out, outl);
129 BIO_copy_next_retry(b);
131 return ((num > 0) ? num : i);
144 /* we are going to be doing some buffering */
145 i = BIO_read(b->next_bio, ctx->ibuf, ctx->ibuf_size);
147 BIO_copy_next_retry(b);
149 return ((num > 0) ? num : i);
156 /* Lets re-read using ourselves :-) */
160 static int buffer_write(BIO *b, const char *in, int inl)
163 BIO_F_BUFFER_CTX *ctx;
165 if ((in == NULL) || (inl <= 0))
167 ctx = (BIO_F_BUFFER_CTX *)b->ptr;
168 if ((ctx == NULL) || (b->next_bio == NULL))
171 BIO_clear_retry_flags(b);
173 i = ctx->obuf_size - (ctx->obuf_len + ctx->obuf_off);
174 /* add to buffer and return */
176 memcpy(&(ctx->obuf[ctx->obuf_off + ctx->obuf_len]), in, inl);
177 ctx->obuf_len += inl;
181 /* stuff already in buffer, so add to it first, then flush */
182 if (ctx->obuf_len != 0) {
183 if (i > 0) { /* lets fill it up if we can */
184 memcpy(&(ctx->obuf[ctx->obuf_off + ctx->obuf_len]), in, i);
190 /* we now have a full buffer needing flushing */
192 i = BIO_write(b->next_bio, &(ctx->obuf[ctx->obuf_off]),
195 BIO_copy_next_retry(b);
198 return ((num > 0) ? num : i);
204 if (ctx->obuf_len == 0)
209 * we only get here if the buffer has been flushed and we still have
214 /* we now have inl bytes to write */
215 while (inl >= ctx->obuf_size) {
216 i = BIO_write(b->next_bio, in, inl);
218 BIO_copy_next_retry(b);
220 return ((num > 0) ? num : i);
232 * copy the rest into the buffer since we have only a small amount left
237 static long buffer_ctrl(BIO *b, int cmd, long num, void *ptr)
240 BIO_F_BUFFER_CTX *ctx;
246 ctx = (BIO_F_BUFFER_CTX *)b->ptr;
254 if (b->next_bio == NULL)
256 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
259 ret = (long)ctx->obuf_len;
261 case BIO_C_GET_BUFF_NUM_LINES:
264 for (i = 0; i < ctx->ibuf_len; i++) {
265 if (p1[ctx->ibuf_off + i] == '\n')
269 case BIO_CTRL_WPENDING:
270 ret = (long)ctx->obuf_len;
272 if (b->next_bio == NULL)
274 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
277 case BIO_CTRL_PENDING:
278 ret = (long)ctx->ibuf_len;
280 if (b->next_bio == NULL)
282 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
285 case BIO_C_SET_BUFF_READ_DATA:
286 if (num > ctx->ibuf_size) {
287 p1 = OPENSSL_malloc((int)num);
290 OPENSSL_free(ctx->ibuf);
294 ctx->ibuf_len = (int)num;
295 memcpy(ctx->ibuf, ptr, (int)num);
298 case BIO_C_SET_BUFF_SIZE:
303 obs = ctx->obuf_size;
304 } else { /* if (*ip == 1) */
306 ibs = ctx->ibuf_size;
315 if ((ibs > DEFAULT_BUFFER_SIZE) && (ibs != ctx->ibuf_size)) {
316 p1 = OPENSSL_malloc((int)num);
320 if ((obs > DEFAULT_BUFFER_SIZE) && (obs != ctx->obuf_size)) {
321 p2 = OPENSSL_malloc((int)num);
328 if (ctx->ibuf != p1) {
329 OPENSSL_free(ctx->ibuf);
333 ctx->ibuf_size = ibs;
335 if (ctx->obuf != p2) {
336 OPENSSL_free(ctx->obuf);
340 ctx->obuf_size = obs;
343 case BIO_C_DO_STATE_MACHINE:
344 if (b->next_bio == NULL)
346 BIO_clear_retry_flags(b);
347 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
348 BIO_copy_next_retry(b);
352 if (b->next_bio == NULL)
354 if (ctx->obuf_len <= 0) {
355 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
360 BIO_clear_retry_flags(b);
361 if (ctx->obuf_len > 0) {
362 r = BIO_write(b->next_bio,
363 &(ctx->obuf[ctx->obuf_off]), ctx->obuf_len);
364 BIO_copy_next_retry(b);
375 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
379 if (!BIO_set_read_buffer_size(dbio, ctx->ibuf_size) ||
380 !BIO_set_write_buffer_size(dbio, ctx->obuf_size))
384 if (b->next_bio == NULL)
386 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
391 BIOerr(BIO_F_BUFFER_CTRL, ERR_R_MALLOC_FAILURE);
395 static long buffer_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
399 if (b->next_bio == NULL)
403 ret = BIO_callback_ctrl(b->next_bio, cmd, fp);
409 static int buffer_gets(BIO *b, char *buf, int size)
411 BIO_F_BUFFER_CTX *ctx;
412 int num = 0, i, flag;
415 ctx = (BIO_F_BUFFER_CTX *)b->ptr;
416 size--; /* reserve space for a '\0' */
417 BIO_clear_retry_flags(b);
420 if (ctx->ibuf_len > 0) {
421 p = &(ctx->ibuf[ctx->ibuf_off]);
423 for (i = 0; (i < ctx->ibuf_len) && (i < size); i++) {
435 if (flag || size == 0) {
439 } else { /* read another chunk */
441 i = BIO_read(b->next_bio, ctx->ibuf, ctx->ibuf_size);
443 BIO_copy_next_retry(b);
446 return ((num > 0) ? num : i);
456 static int buffer_puts(BIO *b, const char *str)
458 return (buffer_write(b, str, strlen(str)));