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
BUF_MEM_new(void)65 BUF_MEM *BUF_MEM_new(void) {
66 BUF_MEM *ret;
67
68 ret = OPENSSL_malloc(sizeof(BUF_MEM));
69 if (ret == NULL) {
70 OPENSSL_PUT_ERROR(BUF, ERR_R_MALLOC_FAILURE);
71 return NULL;
72 }
73
74 memset(ret, 0, sizeof(BUF_MEM));
75 return ret;
76 }
77
BUF_MEM_free(BUF_MEM * buf)78 void BUF_MEM_free(BUF_MEM *buf) {
79 if (buf == NULL) {
80 return;
81 }
82
83 if (buf->data != NULL) {
84 OPENSSL_cleanse(buf->data, buf->max);
85 OPENSSL_free(buf->data);
86 }
87
88 OPENSSL_free(buf);
89 }
90
buf_mem_reserve(BUF_MEM * buf,size_t cap,int clean)91 static int buf_mem_reserve(BUF_MEM *buf, size_t cap, int clean) {
92 if (buf->max >= cap) {
93 return 1;
94 }
95
96 size_t n = cap + 3;
97 if (n < cap) {
98 /* overflow */
99 OPENSSL_PUT_ERROR(BUF, ERR_R_MALLOC_FAILURE);
100 return 0;
101 }
102 n = n / 3;
103 size_t alloc_size = n * 4;
104 if (alloc_size / 4 != n) {
105 /* overflow */
106 OPENSSL_PUT_ERROR(BUF, ERR_R_MALLOC_FAILURE);
107 return 0;
108 }
109
110 char *new_buf;
111 if (buf->data == NULL) {
112 new_buf = OPENSSL_malloc(alloc_size);
113 } else {
114 if (clean) {
115 new_buf = OPENSSL_realloc_clean(buf->data, buf->max, alloc_size);
116 } else {
117 new_buf = OPENSSL_realloc(buf->data, alloc_size);
118 }
119 }
120
121 if (new_buf == NULL) {
122 OPENSSL_PUT_ERROR(BUF, ERR_R_MALLOC_FAILURE);
123 return 0;
124 }
125
126 buf->data = new_buf;
127 buf->max = alloc_size;
128 return 1;
129 }
130
BUF_MEM_reserve(BUF_MEM * buf,size_t cap)131 int BUF_MEM_reserve(BUF_MEM *buf, size_t cap) {
132 return buf_mem_reserve(buf, cap, 0 /* don't clear old buffer contents. */);
133 }
134
buf_mem_grow(BUF_MEM * buf,size_t len,int clean)135 static size_t buf_mem_grow(BUF_MEM *buf, size_t len, int clean) {
136 if (!buf_mem_reserve(buf, len, clean)) {
137 return 0;
138 }
139 if (buf->length < len) {
140 memset(&buf->data[buf->length], 0, len - buf->length);
141 }
142 buf->length = len;
143 return len;
144 }
145
BUF_MEM_grow(BUF_MEM * buf,size_t len)146 size_t BUF_MEM_grow(BUF_MEM *buf, size_t len) {
147 return buf_mem_grow(buf, len, 0 /* don't clear old buffer contents. */);
148 }
149
BUF_MEM_grow_clean(BUF_MEM * buf,size_t len)150 size_t BUF_MEM_grow_clean(BUF_MEM *buf, size_t len) {
151 return buf_mem_grow(buf, len, 1 /* clear old buffer contents. */);
152 }
153
BUF_strdup(const char * buf)154 char *BUF_strdup(const char *buf) {
155 if (buf == NULL) {
156 return NULL;
157 }
158
159 return BUF_strndup(buf, strlen(buf));
160 }
161
BUF_strnlen(const char * str,size_t max_len)162 size_t BUF_strnlen(const char *str, size_t max_len) {
163 size_t i;
164
165 for (i = 0; i < max_len; i++) {
166 if (str[i] == 0) {
167 break;
168 }
169 }
170
171 return i;
172 }
173
BUF_strndup(const char * buf,size_t size)174 char *BUF_strndup(const char *buf, size_t size) {
175 char *ret;
176 size_t alloc_size;
177
178 if (buf == NULL) {
179 return NULL;
180 }
181
182 size = BUF_strnlen(buf, size);
183
184 alloc_size = size + 1;
185 if (alloc_size < size) {
186 /* overflow */
187 OPENSSL_PUT_ERROR(BUF, ERR_R_MALLOC_FAILURE);
188 return NULL;
189 }
190 ret = OPENSSL_malloc(alloc_size);
191 if (ret == NULL) {
192 OPENSSL_PUT_ERROR(BUF, ERR_R_MALLOC_FAILURE);
193 return NULL;
194 }
195
196 memcpy(ret, buf, size);
197 ret[size] = '\0';
198 return ret;
199 }
200
BUF_strlcpy(char * dst,const char * src,size_t dst_size)201 size_t BUF_strlcpy(char *dst, const char *src, size_t dst_size) {
202 size_t l = 0;
203
204 for (; dst_size > 1 && *src; dst_size--) {
205 *dst++ = *src++;
206 l++;
207 }
208
209 if (dst_size) {
210 *dst = 0;
211 }
212
213 return l + strlen(src);
214 }
215
BUF_strlcat(char * dst,const char * src,size_t dst_size)216 size_t BUF_strlcat(char *dst, const char *src, size_t dst_size) {
217 size_t l = 0;
218 for (; dst_size > 0 && *dst; dst_size--, dst++) {
219 l++;
220 }
221 return l + BUF_strlcpy(dst, src, dst_size);
222 }
223
BUF_memdup(const void * data,size_t dst_size)224 void *BUF_memdup(const void *data, size_t dst_size) {
225 void *ret;
226
227 if (dst_size == 0) {
228 return NULL;
229 }
230
231 ret = OPENSSL_malloc(dst_size);
232 if (ret == NULL) {
233 OPENSSL_PUT_ERROR(BUF, ERR_R_MALLOC_FAILURE);
234 return NULL;
235 }
236
237 memcpy(ret, data, dst_size);
238 return ret;
239 }
240