1 /* 2 * Copyright (c) 1997 - 2007 Kungliga Tekniska H�gskolan 3 * (Royal Institute of Technology, Stockholm, Sweden). 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * 3. Neither the name of the Institute nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include "krb5_locl.h" 35 36 RCSID("$Id: data.c 22064 2007-11-11 16:28:14Z lha $"); 37 38 /** 39 * Reset the (potentially uninitalized) krb5_data structure. 40 * 41 * @param p krb5_data to reset. 42 * 43 * @ingroup krb5 44 */ 45 46 void KRB5_LIB_FUNCTION 47 krb5_data_zero(krb5_data *p) 48 { 49 p->length = 0; 50 p->data = NULL; 51 } 52 53 /** 54 * Free the content of krb5_data structure, its ok to free a zeroed 55 * structure. When done, the structure will be zeroed. 56 * 57 * @param p krb5_data to free. 58 * 59 * @ingroup krb5 60 */ 61 62 void KRB5_LIB_FUNCTION 63 krb5_data_free(krb5_data *p) 64 { 65 if(p->data != NULL) 66 free(p->data); 67 krb5_data_zero(p); 68 } 69 70 /** 71 * Same as krb5_data_free(). 72 * 73 * @param context Kerberos 5 context. 74 * @param data krb5_data to free. 75 * 76 * @ingroup krb5 77 */ 78 79 void KRB5_LIB_FUNCTION 80 krb5_free_data_contents(krb5_context context, krb5_data *data) 81 { 82 krb5_data_free(data); 83 } 84 85 /** 86 * Free krb5_data (and its content). 87 * 88 * @param context Kerberos 5 context. 89 * @param p krb5_data to free. 90 * 91 * @ingroup krb5 92 */ 93 94 void KRB5_LIB_FUNCTION 95 krb5_free_data(krb5_context context, 96 krb5_data *p) 97 { 98 krb5_data_free(p); 99 free(p); 100 } 101 102 /** 103 * Allocate data of and krb5_data. 104 * 105 * @param p krb5_data to free. 106 * @param len size to allocate. 107 * 108 * @return Returns 0 to indicate success. Otherwise an kerberos et 109 * error code is returned. 110 * 111 * @ingroup krb5 112 */ 113 114 krb5_error_code KRB5_LIB_FUNCTION 115 krb5_data_alloc(krb5_data *p, int len) 116 { 117 p->data = malloc(len); 118 if(len && p->data == NULL) 119 return ENOMEM; 120 p->length = len; 121 return 0; 122 } 123 124 /** 125 * Grow (or shrink) the content of krb5_data to a new size. 126 * 127 * @param p krb5_data to free. 128 * @param len new size. 129 * 130 * @return Returns 0 to indicate success. Otherwise an kerberos et 131 * error code is returned. 132 * 133 * @ingroup krb5 134 */ 135 136 krb5_error_code KRB5_LIB_FUNCTION 137 krb5_data_realloc(krb5_data *p, int len) 138 { 139 void *tmp; 140 tmp = realloc(p->data, len); 141 if(len && !tmp) 142 return ENOMEM; 143 p->data = tmp; 144 p->length = len; 145 return 0; 146 } 147 148 /** 149 * Copy the data of len into the krb5_data. 150 * 151 * @param p krb5_data to copy into. 152 * @param data data to copy.. 153 * @param len new size. 154 * 155 * @return Returns 0 to indicate success. Otherwise an kerberos et 156 * error code is returned. 157 * 158 * @ingroup krb5 159 */ 160 161 krb5_error_code KRB5_LIB_FUNCTION 162 krb5_data_copy(krb5_data *p, const void *data, size_t len) 163 { 164 if (len) { 165 if(krb5_data_alloc(p, len)) 166 return ENOMEM; 167 memmove(p->data, data, len); 168 } else 169 p->data = NULL; 170 p->length = len; 171 return 0; 172 } 173 174 /** 175 * Copy the data into a newly allocated krb5_data. 176 * 177 * @param context Kerberos 5 context. 178 * @param indata the krb5_data data to copy 179 * @param outdata new krb5_date to copy too. Free with krb5_free_data(). 180 * 181 * @return Returns 0 to indicate success. Otherwise an kerberos et 182 * error code is returned. 183 * 184 * @ingroup krb5 185 */ 186 187 krb5_error_code KRB5_LIB_FUNCTION 188 krb5_copy_data(krb5_context context, 189 const krb5_data *indata, 190 krb5_data **outdata) 191 { 192 krb5_error_code ret; 193 ALLOC(*outdata, 1); 194 if(*outdata == NULL) { 195 krb5_set_error_string(context, "malloc: out of memory"); 196 return ENOMEM; 197 } 198 ret = der_copy_octet_string(indata, *outdata); 199 if(ret) { 200 krb5_clear_error_string (context); 201 free(*outdata); 202 *outdata = NULL; 203 } 204 return ret; 205 } 206 207 /** 208 * Compare to data. 209 * 210 * @param data1 krb5_data to compare 211 * @param data2 krb5_data to compare 212 * 213 * @return return the same way as memcmp(), useful when sorting. 214 * 215 * @ingroup krb5 216 */ 217 218 int KRB5_LIB_FUNCTION 219 krb5_data_cmp(const krb5_data *data1, const krb5_data *data2) 220 { 221 if (data1->length != data2->length) 222 return data1->length - data2->length; 223 return memcmp(data1->data, data2->data, data1->length); 224 } 225