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 <openssl/mem.h>
60 #include <openssl/err.h>
61
62
BUF_MEM_new(void)63 BUF_MEM *BUF_MEM_new(void) {
64 BUF_MEM *ret;
65
66 ret = OPENSSL_malloc(sizeof(BUF_MEM));
67 if (ret == NULL) {
68 OPENSSL_PUT_ERROR(BUF, BUF_MEM_new, ERR_R_MALLOC_FAILURE);
69 return NULL;
70 }
71
72 memset(ret, 0, sizeof(BUF_MEM));
73 return ret;
74 }
75
BUF_MEM_free(BUF_MEM * buf)76 void BUF_MEM_free(BUF_MEM *buf) {
77 if (buf == NULL) {
78 return;
79 }
80
81 if (buf->data != NULL) {
82 OPENSSL_cleanse(buf->data, buf->max);
83 OPENSSL_free(buf->data);
84 }
85
86 OPENSSL_free(buf);
87 }
88
buf_mem_grow(BUF_MEM * buf,size_t len,char clean)89 static size_t buf_mem_grow(BUF_MEM *buf, size_t len, char clean) {
90 char *new_buf;
91 size_t n, alloc_size;
92
93 if (buf->length >= len) {
94 buf->length = len;
95 return len;
96 }
97 if (buf->max >= len) {
98 memset(&buf->data[buf->length], 0, len - buf->length);
99 buf->length = len;
100 return len;
101 }
102
103 n = len + 3;
104 if (n < len) {
105 /* overflow */
106 OPENSSL_PUT_ERROR(BUF, buf_mem_grow, ERR_R_MALLOC_FAILURE);
107 return 0;
108 }
109 n = n / 3;
110 alloc_size = n * 4;
111 if (alloc_size / 4 != n) {
112 /* overflow */
113 OPENSSL_PUT_ERROR(BUF, buf_mem_grow, ERR_R_MALLOC_FAILURE);
114 return 0;
115 }
116
117 if (buf->data == NULL) {
118 new_buf = OPENSSL_malloc(alloc_size);
119 } else {
120 if (clean) {
121 new_buf = OPENSSL_realloc_clean(buf->data, buf->max, alloc_size);
122 } else {
123 new_buf = OPENSSL_realloc(buf->data, alloc_size);
124 }
125 }
126
127 if (new_buf == NULL) {
128 OPENSSL_PUT_ERROR(BUF, buf_mem_grow, ERR_R_MALLOC_FAILURE);
129 len = 0;
130 } else {
131 buf->data = new_buf;
132 buf->max = alloc_size;
133 memset(&buf->data[buf->length], 0, len - buf->length);
134 buf->length = len;
135 }
136
137 return len;
138 }
139
BUF_MEM_grow(BUF_MEM * buf,size_t len)140 size_t BUF_MEM_grow(BUF_MEM *buf, size_t len) {
141 return buf_mem_grow(buf, len, 0 /* don't clear old buffer contents. */);
142 }
143
BUF_MEM_grow_clean(BUF_MEM * buf,size_t len)144 size_t BUF_MEM_grow_clean(BUF_MEM *buf, size_t len) {
145 return buf_mem_grow(buf, len, 1 /* clear old buffer contents. */);
146 }
147
BUF_strdup(const char * buf)148 char *BUF_strdup(const char *buf) {
149 if (buf == NULL) {
150 return NULL;
151 }
152
153 return BUF_strndup(buf, strlen(buf));
154 }
155
BUF_strnlen(const char * str,size_t max_len)156 size_t BUF_strnlen(const char *str, size_t max_len) {
157 size_t i;
158
159 for (i = 0; i < max_len; i++) {
160 if (str[i] == 0) {
161 break;
162 }
163 }
164
165 return i;
166 }
167
BUF_strndup(const char * buf,size_t size)168 char *BUF_strndup(const char *buf, size_t size) {
169 char *ret;
170 size_t alloc_size;
171
172 if (buf == NULL) {
173 return NULL;
174 }
175
176 size = BUF_strnlen(buf, size);
177
178 alloc_size = size + 1;
179 if (alloc_size < size) {
180 /* overflow */
181 OPENSSL_PUT_ERROR(BUF, BUF_strndup, ERR_R_MALLOC_FAILURE);
182 return NULL;
183 }
184 ret = OPENSSL_malloc(alloc_size);
185 if (ret == NULL) {
186 OPENSSL_PUT_ERROR(BUF, BUF_strndup, ERR_R_MALLOC_FAILURE);
187 return NULL;
188 }
189
190 BUF_strlcpy(ret, buf, alloc_size);
191 return ret;
192 }
193
BUF_strlcpy(char * dst,const char * src,size_t dst_size)194 size_t BUF_strlcpy(char *dst, const char *src, size_t dst_size) {
195 size_t l = 0;
196
197 for (; dst_size > 1 && *src; dst_size--) {
198 *dst++ = *src++;
199 l++;
200 }
201
202 if (dst_size) {
203 *dst = 0;
204 }
205
206 return l + strlen(src);
207 }
208
BUF_strlcat(char * dst,const char * src,size_t dst_size)209 size_t BUF_strlcat(char *dst, const char *src, size_t dst_size) {
210 size_t l = 0;
211 for (; dst_size > 0 && *dst; dst_size--, dst++) {
212 l++;
213 }
214 return l + BUF_strlcpy(dst, src, dst_size);
215 }
216
BUF_memdup(const void * data,size_t dst_size)217 void *BUF_memdup(const void *data, size_t dst_size) {
218 void *ret;
219
220 if (data == NULL) {
221 return NULL;
222 }
223
224 ret = OPENSSL_malloc(dst_size);
225 if (ret == NULL) {
226 OPENSSL_PUT_ERROR(BUF, BUF_memdup, ERR_R_MALLOC_FAILURE);
227 return NULL;
228 }
229
230 memcpy(ret, data, dst_size);
231 return ret;
232 }
233