1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
4 * This package is an SSL implementation written
5 * by Eric Young (eay@cryptsoft.com).
6 * The implementation was written so as to conform with Netscapes SSL.
8 * This library is free for commercial and non-commercial use as long as
9 * the following conditions are aheared to. The following conditions
10 * apply to all code found in this distribution, be it the RC4, RSA,
11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
12 * included with this distribution is covered by the same copyright terms
13 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 * Copyright remains Eric Young's, and as such any Copyright notices in
16 * the code are not to be removed.
17 * If this package is used in a product, Eric Young should be given attribution
18 * as the author of the parts of the library used.
19 * This can be in the form of a textual message at program startup or
20 * in documentation (online or textual) provided with the package.
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
25 * 1. Redistributions of source code must retain the copyright
26 * notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 * notice, this list of conditions and the following disclaimer in the
29 * documentation and/or other materials provided with the distribution.
30 * 3. All advertising materials mentioning features or use of this software
31 * must display the following acknowledgement:
32 * "This product includes cryptographic software written by
33 * Eric Young (eay@cryptsoft.com)"
34 * The word 'cryptographic' can be left out if the rouines from the library
35 * being used are not cryptographic related :-).
36 * 4. If you include any Windows specific code (or a derivative thereof) from
37 * the apps directory (application code) you must include an acknowledgement:
38 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
52 * The licence and distribution terms for any publically available version or
53 * derivative of this code cannot be changed. i.e. this code cannot simply be
54 * copied and put under another distribution licence
55 * [including the GNU Public Licence.]
61 #include "internal/cryptlib.h"
63 static int mem_write(BIO *h, const char *buf, int num);
64 static int mem_read(BIO *h, char *buf, int size);
65 static int mem_puts(BIO *h, const char *str);
66 static int mem_gets(BIO *h, char *str, int size);
67 static long mem_ctrl(BIO *h, int cmd, long arg1, void *arg2);
68 static int mem_new(BIO *h);
69 static int secmem_new(BIO *h);
70 static int mem_free(BIO *data);
71 static int mem_buf_free(BIO *data, int free_all);
72 static int mem_buf_sync(BIO *h);
74 static const BIO_METHOD mem_method = {
87 static const BIO_METHOD secmem_method = {
89 "secure memory buffer",
100 /* BIO memory stores buffer and read pointer */
101 typedef struct bio_buf_mem_st {
102 struct buf_mem_st *buf; /* allocated buffer */
103 struct buf_mem_st *readp; /* read pointer */
107 * bio->num is used to hold the value to return on 'empty', if it is 0,
108 * should_retry is not set
111 const BIO_METHOD *BIO_s_mem(void)
113 return (&mem_method);
116 const BIO_METHOD *BIO_s_secmem(void)
118 return(&secmem_method);
121 BIO *BIO_new_mem_buf(const void *buf, int len)
129 BIOerr(BIO_F_BIO_NEW_MEM_BUF, BIO_R_NULL_PARAMETER);
132 sz = (len < 0) ? strlen(buf) : (size_t)len;
133 if ((ret = BIO_new(BIO_s_mem())) == NULL)
135 bb = (BIO_BUF_MEM *)ret->ptr;
137 /* Cast away const and trust in the MEM_RDONLY flag. */
138 b->data = (void *)buf;
141 *bb->readp = *bb->buf;
142 ret->flags |= BIO_FLAGS_MEM_RDONLY;
143 /* Since this is static data retrying wont help */
148 static int mem_init(BIO *bi, unsigned long flags)
150 BIO_BUF_MEM *bb = OPENSSL_zalloc(sizeof(*bb));
154 if ((bb->buf = BUF_MEM_new_ex(flags)) == NULL) {
158 if ((bb->readp = OPENSSL_zalloc(sizeof(*bb->readp))) == NULL) {
159 BUF_MEM_free(bb->buf);
163 *bb->readp = *bb->buf;
167 bi->ptr = (char *)bb;
171 static int mem_new(BIO *bi)
173 return (mem_init(bi, 0L));
176 static int secmem_new(BIO *bi)
178 return (mem_init(bi, BUF_MEM_FLAG_SECURE));
181 static int mem_free(BIO *a)
183 return (mem_buf_free(a, 1));
186 static int mem_buf_free(BIO *a, int free_all)
191 if ((a->init) && (a->ptr != NULL)) {
193 BIO_BUF_MEM *bb = (BIO_BUF_MEM *)a->ptr;
197 if (a->flags & BIO_FLAGS_MEM_RDONLY)
201 OPENSSL_free(bb->readp);
212 * Reallocate memory buffer if read pointer differs
214 static int mem_buf_sync(BIO *b)
216 if((b != NULL) && (b->init) && (b->ptr != NULL)) {
217 BIO_BUF_MEM *bbm = (BIO_BUF_MEM *)b->ptr;
219 if(bbm->readp->data != bbm->buf->data) {
220 memmove(bbm->buf->data, bbm->readp->data, bbm->readp->length);
221 bbm->buf->length = bbm->readp->length;
222 bbm->readp->data = bbm->buf->data;
228 static int mem_read(BIO *b, char *out, int outl)
231 BIO_BUF_MEM *bbm = (BIO_BUF_MEM *)b->ptr;
232 BUF_MEM *bm = bbm->readp;
234 BIO_clear_retry_flags(b);
235 ret = (outl >= 0 && (size_t)outl > bm->length) ? (int)bm->length : outl;
236 if ((out != NULL) && (ret > 0)) {
237 memcpy(out, bm->data, ret);
240 } else if (bm->length == 0) {
243 BIO_set_retry_read(b);
248 static int mem_write(BIO *b, const char *in, int inl)
252 BIO_BUF_MEM *bbm = (BIO_BUF_MEM *)b->ptr;
255 BIOerr(BIO_F_MEM_WRITE, BIO_R_NULL_PARAMETER);
258 if (b->flags & BIO_FLAGS_MEM_RDONLY) {
259 BIOerr(BIO_F_MEM_WRITE, BIO_R_WRITE_TO_READ_ONLY_BIO);
262 BIO_clear_retry_flags(b);
263 blen = bbm->readp->length;
265 if (BUF_MEM_grow_clean(bbm->buf, blen + inl) == 0)
267 memcpy(bbm->buf->data + blen, in, inl);
268 *bbm->readp = *bbm->buf;
274 static long mem_ctrl(BIO *b, int cmd, long num, void *ptr)
278 BIO_BUF_MEM *bbm = (BIO_BUF_MEM *)b->ptr;
284 if (bm->data != NULL) {
285 /* For read only case reset to the start again */
286 if ((b->flags & BIO_FLAGS_MEM_RDONLY) || (b->flags & BIO_FLAGS_NONCLEAR_RST)) {
287 bm->length = bm->max;
289 memset(bm->data, 0, bm->max);
292 *bbm->readp = *bbm->buf;
297 ret = (long)(bm->length == 0);
299 case BIO_C_SET_BUF_MEM_EOF_RETURN:
304 ret = (long)bm->length;
307 *pptr = (char *)&(bm->data[0]);
310 case BIO_C_SET_BUF_MEM:
312 b->shutdown = (int)num;
314 *bbm->readp = *bbm->buf;
317 case BIO_C_GET_BUF_MEM_PTR:
325 case BIO_CTRL_GET_CLOSE:
326 ret = (long)b->shutdown;
328 case BIO_CTRL_SET_CLOSE:
329 b->shutdown = (int)num;
331 case BIO_CTRL_WPENDING:
334 case BIO_CTRL_PENDING:
336 ret = (long)bm->length;
351 static int mem_gets(BIO *bp, char *buf, int size)
356 BIO_BUF_MEM *bbm = (BIO_BUF_MEM *)bp->ptr;
357 BUF_MEM *bm = bbm->readp;
359 BIO_clear_retry_flags(bp);
368 for (i = 0; i < j; i++) {
376 * i is now the max num of bytes to copy, either j or up to
377 * and including the first newline
380 i = mem_read(bp, buf, i);
387 static int mem_puts(BIO *bp, const char *str)
392 ret = mem_write(bp, str, n);
393 /* memory semantics is that it will always work */