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
64static int mem_write(BIO *h, const char *buf, int num);
65static int mem_read(BIO *h, char *buf, int size);
66static int mem_puts(BIO *h, const char *str);
67static int mem_gets(BIO *h, char *str, int size);
68static long mem_ctrl(BIO *h, int cmd, long arg1, void *arg2);
69static int mem_new(BIO *h);
70static int mem_free(BIO *data);
71static 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
88BIO_METHOD *BIO_s_mem(void)
89	{
90	return(&mem_method);
91	}
92
93BIO *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
115static 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
128static 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
145static 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
169static 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;
193end:
194	return(ret);
195	}
196
197static 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
274static 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
310static 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	}
319
320