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