Line data Source code
1 : /* crypto/bio/bss_mem.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 mem_write(BIO *h, const char *buf, int num);
65 : static int mem_read(BIO *h, char *buf, int size);
66 : static int mem_puts(BIO *h, const char *str);
67 : static int mem_gets(BIO *h, char *str, int size);
68 : static long mem_ctrl(BIO *h, int cmd, long arg1, void *arg2);
69 : static int mem_new(BIO *h);
70 : static int mem_free(BIO *data);
71 : static BIO_METHOD mem_method = {
72 : BIO_TYPE_MEM,
73 : "memory buffer",
74 : mem_write,
75 : mem_read,
76 : mem_puts,
77 : mem_gets,
78 : mem_ctrl,
79 : mem_new,
80 : mem_free,
81 : NULL,
82 : };
83 :
84 : /*
85 : * bio->num is used to hold the value to return on 'empty', if it is 0,
86 : * should_retry is not set
87 : */
88 :
89 2257 : BIO_METHOD *BIO_s_mem(void)
90 : {
91 2257 : return (&mem_method);
92 : }
93 :
94 1748 : BIO *BIO_new_mem_buf(void *buf, int len)
95 : {
96 : BIO *ret;
97 : BUF_MEM *b;
98 : size_t sz;
99 :
100 1748 : if (!buf) {
101 0 : BIOerr(BIO_F_BIO_NEW_MEM_BUF, BIO_R_NULL_PARAMETER);
102 0 : return NULL;
103 : }
104 1748 : sz = (len < 0) ? strlen(buf) : (size_t)len;
105 1748 : if (!(ret = BIO_new(BIO_s_mem())))
106 : return NULL;
107 1748 : b = (BUF_MEM *)ret->ptr;
108 1748 : b->data = buf;
109 1748 : b->length = sz;
110 1748 : b->max = sz;
111 1748 : ret->flags |= BIO_FLAGS_MEM_RDONLY;
112 : /* Since this is static data retrying wont help */
113 1748 : ret->num = 0;
114 1748 : return ret;
115 : }
116 :
117 4007 : static int mem_new(BIO *bi)
118 : {
119 : BUF_MEM *b;
120 :
121 4007 : if ((b = BUF_MEM_new()) == NULL)
122 : return (0);
123 4007 : bi->shutdown = 1;
124 4007 : bi->init = 1;
125 4007 : bi->num = -1;
126 4007 : bi->ptr = (char *)b;
127 4007 : return (1);
128 : }
129 :
130 4007 : static int mem_free(BIO *a)
131 : {
132 4007 : if (a == NULL)
133 : return (0);
134 4007 : if (a->shutdown) {
135 4007 : if ((a->init) && (a->ptr != NULL)) {
136 : BUF_MEM *b;
137 : b = (BUF_MEM *)a->ptr;
138 4007 : if (a->flags & BIO_FLAGS_MEM_RDONLY)
139 1748 : b->data = NULL;
140 4007 : BUF_MEM_free(b);
141 4007 : a->ptr = NULL;
142 : }
143 : }
144 : return (1);
145 : }
146 :
147 71627 : static int mem_read(BIO *b, char *out, int outl)
148 : {
149 : int ret = -1;
150 : BUF_MEM *bm;
151 :
152 71627 : bm = (BUF_MEM *)b->ptr;
153 71627 : BIO_clear_retry_flags(b);
154 71639 : ret = (outl >= 0 && (size_t)outl > bm->length) ? (int)bm->length : outl;
155 71639 : if ((out != NULL) && (ret > 0)) {
156 56134 : memcpy(out, bm->data, ret);
157 56134 : bm->length -= ret;
158 56134 : if (b->flags & BIO_FLAGS_MEM_RDONLY)
159 26662 : bm->data += ret;
160 : else {
161 29472 : memmove(&(bm->data[0]), &(bm->data[ret]), bm->length);
162 : }
163 15505 : } else if (bm->length == 0) {
164 15505 : ret = b->num;
165 15505 : if (ret != 0)
166 15505 : BIO_set_retry_read(b);
167 : }
168 71639 : return (ret);
169 : }
170 :
171 20815 : static int mem_write(BIO *b, const char *in, int inl)
172 : {
173 : int ret = -1;
174 : int blen;
175 : BUF_MEM *bm;
176 :
177 20815 : bm = (BUF_MEM *)b->ptr;
178 20815 : if (in == NULL) {
179 0 : BIOerr(BIO_F_MEM_WRITE, BIO_R_NULL_PARAMETER);
180 0 : goto end;
181 : }
182 :
183 20815 : if (b->flags & BIO_FLAGS_MEM_RDONLY) {
184 0 : BIOerr(BIO_F_MEM_WRITE, BIO_R_WRITE_TO_READ_ONLY_BIO);
185 0 : goto end;
186 : }
187 :
188 20815 : BIO_clear_retry_flags(b);
189 20815 : blen = bm->length;
190 20815 : if (BUF_MEM_grow_clean(bm, blen + inl) != (blen + inl))
191 : goto end;
192 20814 : memcpy(&(bm->data[blen]), in, inl);
193 : ret = inl;
194 : end:
195 20812 : return (ret);
196 : }
197 :
198 40244 : static long mem_ctrl(BIO *b, int cmd, long num, void *ptr)
199 : {
200 : long ret = 1;
201 : char **pptr;
202 :
203 40244 : BUF_MEM *bm = (BUF_MEM *)b->ptr;
204 :
205 40244 : switch (cmd) {
206 : case BIO_CTRL_RESET:
207 0 : if (bm->data != NULL) {
208 : /* For read only case reset to the start again */
209 0 : if (b->flags & BIO_FLAGS_MEM_RDONLY) {
210 0 : bm->data -= bm->max - bm->length;
211 0 : bm->length = bm->max;
212 : } else {
213 0 : memset(bm->data, 0, bm->max);
214 0 : bm->length = 0;
215 : }
216 : }
217 : break;
218 : case BIO_CTRL_EOF:
219 0 : ret = (long)(bm->length == 0);
220 0 : break;
221 : case BIO_C_SET_BUF_MEM_EOF_RETURN:
222 0 : b->num = (int)num;
223 0 : break;
224 : case BIO_CTRL_INFO:
225 743 : ret = (long)bm->length;
226 743 : if (ptr != NULL) {
227 : pptr = (char **)ptr;
228 743 : *pptr = (char *)&(bm->data[0]);
229 : }
230 : break;
231 : case BIO_C_SET_BUF_MEM:
232 0 : mem_free(b);
233 0 : b->shutdown = (int)num;
234 0 : b->ptr = ptr;
235 0 : break;
236 : case BIO_C_GET_BUF_MEM_PTR:
237 0 : if (ptr != NULL) {
238 : pptr = (char **)ptr;
239 0 : *pptr = (char *)bm;
240 : }
241 : break;
242 : case BIO_CTRL_GET_CLOSE:
243 0 : ret = (long)b->shutdown;
244 0 : break;
245 : case BIO_CTRL_SET_CLOSE:
246 746 : b->shutdown = (int)num;
247 746 : break;
248 :
249 : case BIO_CTRL_WPENDING:
250 : ret = 0L;
251 : break;
252 : case BIO_CTRL_PENDING:
253 36153 : ret = (long)bm->length;
254 36153 : break;
255 : case BIO_CTRL_DUP:
256 : case BIO_CTRL_FLUSH:
257 : ret = 1;
258 1110 : break;
259 : case BIO_CTRL_PUSH:
260 : case BIO_CTRL_POP:
261 : default:
262 : ret = 0;
263 : break;
264 : }
265 40244 : return (ret);
266 : }
267 :
268 27739 : static int mem_gets(BIO *bp, char *buf, int size)
269 : {
270 : int i, j;
271 : int ret = -1;
272 : char *p;
273 27739 : BUF_MEM *bm = (BUF_MEM *)bp->ptr;
274 :
275 27739 : BIO_clear_retry_flags(bp);
276 27739 : j = bm->length;
277 27739 : if ((size - 1) < j)
278 19811 : j = size - 1;
279 27739 : if (j <= 0) {
280 872 : *buf = '\0';
281 872 : return 0;
282 : }
283 26867 : p = bm->data;
284 1592787 : for (i = 0; i < j; i++) {
285 1592787 : if (p[i] == '\n') {
286 26867 : i++;
287 26867 : break;
288 : }
289 : }
290 :
291 : /*
292 : * i is now the max num of bytes to copy, either j or up to
293 : * and including the first newline
294 : */
295 :
296 26867 : i = mem_read(bp, buf, i);
297 26867 : if (i > 0)
298 26867 : buf[i] = '\0';
299 : ret = i;
300 26867 : return (ret);
301 : }
302 :
303 12 : static int mem_puts(BIO *bp, const char *str)
304 : {
305 : int n, ret;
306 :
307 12 : n = strlen(str);
308 12 : ret = mem_write(bp, str, n);
309 : /* memory semantics is that it will always work */
310 12 : return (ret);
311 : }
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