1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
2 * All rights reserved.
3 *
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.
7 *
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).
14 *
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.
21 *
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
24 * are met:
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)"
39 *
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
50 * SUCH DAMAGE.
51 *
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.] */
56
57 #include <openssl/buf.h>
58
59 #include <string.h>
60
61 #include <openssl/mem.h>
62 #include <openssl/err.h>
63
64 #include "../internal.h"
65
66
BUF_MEM_new(void)67 BUF_MEM *BUF_MEM_new(void) {
68 BUF_MEM *ret;
69
70 ret = OPENSSL_malloc(sizeof(BUF_MEM));
71 if (ret == NULL) {
72 OPENSSL_PUT_ERROR(BUF, ERR_R_MALLOC_FAILURE);
73 return NULL;
74 }
75
76 OPENSSL_memset(ret, 0, sizeof(BUF_MEM));
77 return ret;
78 }
79
BUF_MEM_free(BUF_MEM * buf)80 void BUF_MEM_free(BUF_MEM *buf) {
81 if (buf == NULL) {
82 return;
83 }
84
85 if (buf->data != NULL) {
86 OPENSSL_cleanse(buf->data, buf->max);
87 OPENSSL_free(buf->data);
88 }
89
90 OPENSSL_free(buf);
91 }
92
buf_mem_reserve(BUF_MEM * buf,size_t cap,int clean)93 static int buf_mem_reserve(BUF_MEM *buf, size_t cap, int clean) {
94 if (buf->max >= cap) {
95 return 1;
96 }
97
98 size_t n = cap + 3;
99 if (n < cap) {
100 /* overflow */
101 OPENSSL_PUT_ERROR(BUF, ERR_R_MALLOC_FAILURE);
102 return 0;
103 }
104 n = n / 3;
105 size_t alloc_size = n * 4;
106 if (alloc_size / 4 != n) {
107 /* overflow */
108 OPENSSL_PUT_ERROR(BUF, ERR_R_MALLOC_FAILURE);
109 return 0;
110 }
111
112 char *new_buf;
113 if (buf->data == NULL) {
114 new_buf = OPENSSL_malloc(alloc_size);
115 } else {
116 if (clean) {
117 new_buf = OPENSSL_realloc_clean(buf->data, buf->max, alloc_size);
118 } else {
119 new_buf = OPENSSL_realloc(buf->data, alloc_size);
120 }
121 }
122
123 if (new_buf == NULL) {
124 OPENSSL_PUT_ERROR(BUF, ERR_R_MALLOC_FAILURE);
125 return 0;
126 }
127
128 buf->data = new_buf;
129 buf->max = alloc_size;
130 return 1;
131 }
132
BUF_MEM_reserve(BUF_MEM * buf,size_t cap)133 int BUF_MEM_reserve(BUF_MEM *buf, size_t cap) {
134 return buf_mem_reserve(buf, cap, 0 /* don't clear old buffer contents. */);
135 }
136
buf_mem_grow(BUF_MEM * buf,size_t len,int clean)137 static size_t buf_mem_grow(BUF_MEM *buf, size_t len, int clean) {
138 if (!buf_mem_reserve(buf, len, clean)) {
139 return 0;
140 }
141 if (buf->length < len) {
142 OPENSSL_memset(&buf->data[buf->length], 0, len - buf->length);
143 }
144 buf->length = len;
145 return len;
146 }
147
BUF_MEM_grow(BUF_MEM * buf,size_t len)148 size_t BUF_MEM_grow(BUF_MEM *buf, size_t len) {
149 return buf_mem_grow(buf, len, 0 /* don't clear old buffer contents. */);
150 }
151
BUF_MEM_grow_clean(BUF_MEM * buf,size_t len)152 size_t BUF_MEM_grow_clean(BUF_MEM *buf, size_t len) {
153 return buf_mem_grow(buf, len, 1 /* clear old buffer contents. */);
154 }
155
BUF_strdup(const char * buf)156 char *BUF_strdup(const char *buf) {
157 if (buf == NULL) {
158 return NULL;
159 }
160
161 return BUF_strndup(buf, strlen(buf));
162 }
163
BUF_strnlen(const char * str,size_t max_len)164 size_t BUF_strnlen(const char *str, size_t max_len) {
165 size_t i;
166
167 for (i = 0; i < max_len; i++) {
168 if (str[i] == 0) {
169 break;
170 }
171 }
172
173 return i;
174 }
175
BUF_strndup(const char * buf,size_t size)176 char *BUF_strndup(const char *buf, size_t size) {
177 char *ret;
178 size_t alloc_size;
179
180 if (buf == NULL) {
181 return NULL;
182 }
183
184 size = BUF_strnlen(buf, size);
185
186 alloc_size = size + 1;
187 if (alloc_size < size) {
188 /* overflow */
189 OPENSSL_PUT_ERROR(BUF, ERR_R_MALLOC_FAILURE);
190 return NULL;
191 }
192 ret = OPENSSL_malloc(alloc_size);
193 if (ret == NULL) {
194 OPENSSL_PUT_ERROR(BUF, ERR_R_MALLOC_FAILURE);
195 return NULL;
196 }
197
198 OPENSSL_memcpy(ret, buf, size);
199 ret[size] = '\0';
200 return ret;
201 }
202
BUF_strlcpy(char * dst,const char * src,size_t dst_size)203 size_t BUF_strlcpy(char *dst, const char *src, size_t dst_size) {
204 size_t l = 0;
205
206 for (; dst_size > 1 && *src; dst_size--) {
207 *dst++ = *src++;
208 l++;
209 }
210
211 if (dst_size) {
212 *dst = 0;
213 }
214
215 return l + strlen(src);
216 }
217
BUF_strlcat(char * dst,const char * src,size_t dst_size)218 size_t BUF_strlcat(char *dst, const char *src, size_t dst_size) {
219 size_t l = 0;
220 for (; dst_size > 0 && *dst; dst_size--, dst++) {
221 l++;
222 }
223 return l + BUF_strlcpy(dst, src, dst_size);
224 }
225
BUF_memdup(const void * data,size_t dst_size)226 void *BUF_memdup(const void *data, size_t dst_size) {
227 void *ret;
228
229 if (dst_size == 0) {
230 return NULL;
231 }
232
233 ret = OPENSSL_malloc(dst_size);
234 if (ret == NULL) {
235 OPENSSL_PUT_ERROR(BUF, ERR_R_MALLOC_FAILURE);
236 return NULL;
237 }
238
239 OPENSSL_memcpy(ret, data, dst_size);
240 return ret;
241 }
242