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 <openssl/mem.h> 60 #include <openssl/err.h> 61 62 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 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 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 } 139 140 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 } 143 144 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 } 147 148 char *BUF_strdup(const char *buf) { 149 if (buf == NULL) { 150 return NULL; 151 } 152 153 return BUF_strndup(buf, strlen(buf)); 154 } 155 156 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 } 167 168 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 } 193 194 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 } 208 209 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 } 216 217 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
