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 #include "../internal.h" 65 66 67 BUF_MEM *BUF_MEM_new(void) { 68 BUF_MEM *ret; 69 70 ret = OPENSSL_malloc(sizeof(BUF_MEM)); 71 if (ret == NULL) { 72 OPENSSL_PUT_ERROR(BUF, ERR_R_MALLOC_FAILURE); 73 return NULL; 74 } 75 76 OPENSSL_memset(ret, 0, sizeof(BUF_MEM)); 77 return ret; 78 } 79 80 void BUF_MEM_free(BUF_MEM *buf) { 81 if (buf == NULL) { 82 return; 83 } 84 85 OPENSSL_free(buf->data); 86 OPENSSL_free(buf); 87 } 88 89 int BUF_MEM_reserve(BUF_MEM *buf, size_t cap) { 90 if (buf->max >= cap) { 91 return 1; 92 } 93 94 size_t n = cap + 3; 95 if (n < cap) { 96 // overflow 97 OPENSSL_PUT_ERROR(BUF, ERR_R_MALLOC_FAILURE); 98 return 0; 99 } 100 n = n / 3; 101 size_t alloc_size = n * 4; 102 if (alloc_size / 4 != n) { 103 // overflow 104 OPENSSL_PUT_ERROR(BUF, ERR_R_MALLOC_FAILURE); 105 return 0; 106 } 107 108 char *new_buf = OPENSSL_realloc(buf->data, alloc_size); 109 if (new_buf == NULL) { 110 OPENSSL_PUT_ERROR(BUF, ERR_R_MALLOC_FAILURE); 111 return 0; 112 } 113 114 buf->data = new_buf; 115 buf->max = alloc_size; 116 return 1; 117 } 118 119 size_t BUF_MEM_grow(BUF_MEM *buf, size_t len) { 120 if (!BUF_MEM_reserve(buf, len)) { 121 return 0; 122 } 123 if (buf->length < len) { 124 OPENSSL_memset(&buf->data[buf->length], 0, len - buf->length); 125 } 126 buf->length = len; 127 return len; 128 } 129 130 size_t BUF_MEM_grow_clean(BUF_MEM *buf, size_t len) { 131 return BUF_MEM_grow(buf, len); 132 } 133 134 int BUF_MEM_append(BUF_MEM *buf, const void *in, size_t len) { 135 size_t new_len = buf->length + len; 136 if (new_len < len) { 137 OPENSSL_PUT_ERROR(BUF, ERR_R_OVERFLOW); 138 return 0; 139 } 140 if (!BUF_MEM_reserve(buf, new_len)) { 141 return 0; 142 } 143 OPENSSL_memcpy(buf->data + buf->length, in, len); 144 buf->length = new_len; 145 return 1; 146 } 147 148 char *BUF_strdup(const char *str) { 149 if (str == NULL) { 150 return NULL; 151 } 152 153 return BUF_strndup(str, strlen(str)); 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 *str, size_t size) { 169 char *ret; 170 size_t alloc_size; 171 172 if (str == NULL) { 173 return NULL; 174 } 175 176 size = BUF_strnlen(str, size); 177 178 alloc_size = size + 1; 179 if (alloc_size < size) { 180 // overflow 181 OPENSSL_PUT_ERROR(BUF, ERR_R_MALLOC_FAILURE); 182 return NULL; 183 } 184 ret = OPENSSL_malloc(alloc_size); 185 if (ret == NULL) { 186 OPENSSL_PUT_ERROR(BUF, ERR_R_MALLOC_FAILURE); 187 return NULL; 188 } 189 190 OPENSSL_memcpy(ret, str, size); 191 ret[size] = '\0'; 192 return ret; 193 } 194 195 size_t BUF_strlcpy(char *dst, const char *src, size_t dst_size) { 196 size_t l = 0; 197 198 for (; dst_size > 1 && *src; dst_size--) { 199 *dst++ = *src++; 200 l++; 201 } 202 203 if (dst_size) { 204 *dst = 0; 205 } 206 207 return l + strlen(src); 208 } 209 210 size_t BUF_strlcat(char *dst, const char *src, size_t dst_size) { 211 size_t l = 0; 212 for (; dst_size > 0 && *dst; dst_size--, dst++) { 213 l++; 214 } 215 return l + BUF_strlcpy(dst, src, dst_size); 216 } 217 218 void *BUF_memdup(const void *data, size_t size) { 219 if (size == 0) { 220 return NULL; 221 } 222 223 void *ret = OPENSSL_malloc(size); 224 if (ret == NULL) { 225 OPENSSL_PUT_ERROR(BUF, ERR_R_MALLOC_FAILURE); 226 return NULL; 227 } 228 229 OPENSSL_memcpy(ret, data, size); 230 return ret; 231 } 232
