1 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 2 * All rights reserved. 3 * 4 * This package is an SSL implementation written 5 * by Eric Young (eay (at) 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 (at) 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 (at) 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 (at) 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 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 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 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 } 141 142 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 } 145 146 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 } 149 150 char *BUF_strdup(const char *buf) { 151 if (buf == NULL) { 152 return NULL; 153 } 154 155 return BUF_strndup(buf, strlen(buf)); 156 } 157 158 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 } 169 170 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 } 196 197 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 } 211 212 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 } 219 220 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
