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 {
73 BIO_TYPE_MEM,
74 "memory buffer",
75 mem_write,
76 mem_read,
77 mem_puts,
78 mem_gets,
79 mem_ctrl,
80 mem_new,
81 mem_free,
82 NULL,
83 };
84
85 /* bio->num is used to hold the value to return on 'empty', if it is
86 * 0, should_retry is not set */
87
88 BIO_METHOD *BIO_s_mem(void)
89 {
90 return(&mem_method);
91 }
92
93 BIO *BIO_new_mem_buf(void *buf, int len)
94 {
95 BIO *ret;
96 BUF_MEM *b;
97 size_t sz;
98
99 if (!buf) {
100 BIOerr(BIO_F_BIO_NEW_MEM_BUF,BIO_R_NULL_PARAMETER);
101 return NULL;
102 }
103 sz = (len<0) ? strlen(buf) : (size_t)len;
104 if(!(ret = BIO_new(BIO_s_mem())) ) return NULL;
105 b = (BUF_MEM *)ret->ptr;
106 b->data = buf;
107 b->length = sz;
108 b->max = sz;
109 ret->flags |= BIO_FLAGS_MEM_RDONLY;
110 /* Since this is static data retrying wont help */
111 ret->num = 0;
112 return ret;
113 }
114
115 static int mem_new(BIO *bi)
116 {
117 BUF_MEM *b;
118
119 if ((b=BUF_MEM_new()) == NULL)
120 return(0);
121 bi->shutdown=1;
122 bi->init=1;
123 bi->num= -1;
124 bi->ptr=(char *)b;
125 return(1);
126 }
127
128 static int mem_free(BIO *a)
129 {
130 if (a == NULL) return(0);
131 if (a->shutdown)
132 {
133 if ((a->init) && (a->ptr != NULL))
134 {
135 BUF_MEM *b;
136 b = (BUF_MEM *)a->ptr;
137 if(a->flags & BIO_FLAGS_MEM_RDONLY) b->data = NULL;
138 BUF_MEM_free(b);
139 a->ptr=NULL;
140 }
141 }
142 return(1);
143 }
144
145 static int mem_read(BIO *b, char *out, int outl)
146 {
147 int ret= -1;
148 BUF_MEM *bm;
149
150 bm=(BUF_MEM *)b->ptr;
151 BIO_clear_retry_flags(b);
152 ret=(outl >=0 && (size_t)outl > bm->length)?(int)bm->length:outl;
153 if ((out != NULL) && (ret > 0)) {
154 memcpy(out,bm->data,ret);
155 bm->length-=ret;
156 if(b->flags & BIO_FLAGS_MEM_RDONLY) bm->data += ret;
157 else {
158 memmove(&(bm->data[0]),&(bm->data[ret]),bm->length);
159 }
160 } else if (bm->length == 0)
161 {
162 ret = b->num;
163 if (ret != 0)
164 BIO_set_retry_read(b);
165 }
166 return(ret);
167 }
168
169 static int mem_write(BIO *b, const char *in, int inl)
170 {
171 int ret= -1;
172 int blen;
173 BUF_MEM *bm;
174
175 bm=(BUF_MEM *)b->ptr;
176 if (in == NULL)
177 {
178 BIOerr(BIO_F_MEM_WRITE,BIO_R_NULL_PARAMETER);
179 goto end;
180 }
181
182 if(b->flags & BIO_FLAGS_MEM_RDONLY) {
183 BIOerr(BIO_F_MEM_WRITE,BIO_R_WRITE_TO_READ_ONLY_BIO);
184 goto end;
185 }
186
187 BIO_clear_retry_flags(b);
188 blen=bm->length;
189 if (BUF_MEM_grow_clean(bm,blen+inl) != (blen+inl))
190 goto end;
191 memcpy(&(bm->data[blen]),in,inl);
192 ret=inl;
193 end:
194 return(ret);
195 }
196
197 static long mem_ctrl(BIO *b, int cmd, long num, void *ptr)
198 {
199 long ret=1;
200 char **pptr;
201
202 BUF_MEM *bm=(BUF_MEM *)b->ptr;
203
204 switch (cmd)
205 {
206 case BIO_CTRL_RESET:
207 if (bm->data != NULL)
208 {
209 /* For read only case reset to the start again */
210 if(b->flags & BIO_FLAGS_MEM_RDONLY)
211 {
212 bm->data -= bm->max - bm->length;
213 bm->length = bm->max;
214 }
215 else
216 {
217 memset(bm->data,0,bm->max);
218 bm->length=0;
219 }
220 }
221 break;
222 case BIO_CTRL_EOF:
223 ret=(long)(bm->length == 0);
224 break;
225 case BIO_C_SET_BUF_MEM_EOF_RETURN:
226 b->num=(int)num;
227 break;
228 case BIO_CTRL_INFO:
229 ret=(long)bm->length;
230 if (ptr != NULL)
231 {
232 pptr=(char **)ptr;
233 *pptr=(char *)&(bm->data[0]);
234 }
235 break;
236 case BIO_C_SET_BUF_MEM:
237 mem_free(b);
238 b->shutdown=(int)num;
239 b->ptr=ptr;
240 break;
241 case BIO_C_GET_BUF_MEM_PTR:
242 if (ptr != NULL)
243 {
244 pptr=(char **)ptr;
245 *pptr=(char *)bm;
246 }
247 break;
248 case BIO_CTRL_GET_CLOSE:
249 ret=(long)b->shutdown;
250 break;
251 case BIO_CTRL_SET_CLOSE:
252 b->shutdown=(int)num;
253 break;
254
255 case BIO_CTRL_WPENDING:
256 ret=0L;
257 break;
258 case BIO_CTRL_PENDING:
259 ret=(long)bm->length;
260 break;
261 case BIO_CTRL_DUP:
262 case BIO_CTRL_FLUSH:
263 ret=1;
264 break;
265 case BIO_CTRL_PUSH:
266 case BIO_CTRL_POP:
267 default:
268 ret=0;
269 break;
270 }
271 return(ret);
272 }
273
274 static int mem_gets(BIO *bp, char *buf, int size)
275 {
276 int i,j;
277 int ret= -1;
278 char *p;
279 BUF_MEM *bm=(BUF_MEM *)bp->ptr;
280
281 BIO_clear_retry_flags(bp);
282 j=bm->length;
283 if ((size-1) < j) j=size-1;
284 if (j <= 0)
285 {
286 *buf='\0';
287 return 0;
288 }
289 p=bm->data;
290 for (i=0; i<j; i++)
291 {
292 if (p[i] == '\n')
293 {
294 i++;
295 break;
296 }
297 }
298
299 /*
300 * i is now the max num of bytes to copy, either j or up to
301 * and including the first newline
302 */
303
304 i=mem_read(bp,buf,i);
305 if (i > 0) buf[i]='\0';
306 ret=i;
307 return(ret);
308 }
309
310 static int mem_puts(BIO *bp, const char *str)
311 {
312 int n,ret;
313
314 n=strlen(str);
315 ret=mem_write(bp,str,n);
316 /* memory semantics is that it will always work */
317 return(ret);
318 }