ares_data.c (4934B)
1 /* MIT License 2 * 3 * Copyright (c) 2009 Daniel Stenberg 4 * 5 * Permission is hereby granted, free of charge, to any person obtaining a copy 6 * of this software and associated documentation files (the "Software"), to deal 7 * in the Software without restriction, including without limitation the rights 8 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 * copies of the Software, and to permit persons to whom the Software is 10 * furnished to do so, subject to the following conditions: 11 * 12 * The above copyright notice and this permission notice (including the next 13 * paragraph) shall be included in all copies or substantial portions of the 14 * Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 22 * SOFTWARE. 23 * 24 * SPDX-License-Identifier: MIT 25 */ 26 27 #include "ares_private.h" 28 #include <stddef.h> 29 #include <assert.h> 30 #include "ares_data.h" 31 32 /* 33 ** ares_free_data() - c-ares external API function. 34 ** 35 ** This function must be used by the application to free data memory that 36 ** has been internally allocated by some c-ares function and for which a 37 ** pointer has already been returned to the calling application. The list 38 ** of c-ares functions returning pointers that must be free'ed using this 39 ** function is: 40 ** 41 ** ares_get_servers() 42 ** ares_parse_srv_reply() 43 ** ares_parse_txt_reply() 44 */ 45 46 void ares_free_data(void *dataptr) 47 { 48 while (dataptr != NULL) { 49 struct ares_data *ptr; 50 void *next_data = NULL; 51 52 #ifdef __INTEL_COMPILER 53 # pragma warning(push) 54 # pragma warning(disable : 1684) 55 /* 1684: conversion from pointer to same-sized integral type */ 56 #endif 57 58 ptr = (void *)((char *)dataptr - offsetof(struct ares_data, data)); 59 60 #ifdef __INTEL_COMPILER 61 # pragma warning(pop) 62 #endif 63 64 if (ptr->mark != ARES_DATATYPE_MARK) { 65 return; 66 } 67 68 switch (ptr->type) { 69 case ARES_DATATYPE_MX_REPLY: 70 next_data = ptr->data.mx_reply.next; 71 ares_free(ptr->data.mx_reply.host); 72 break; 73 74 case ARES_DATATYPE_SRV_REPLY: 75 next_data = ptr->data.srv_reply.next; 76 ares_free(ptr->data.srv_reply.host); 77 break; 78 79 case ARES_DATATYPE_URI_REPLY: 80 next_data = ptr->data.uri_reply.next; 81 ares_free(ptr->data.uri_reply.uri); 82 break; 83 84 case ARES_DATATYPE_TXT_REPLY: 85 case ARES_DATATYPE_TXT_EXT: 86 next_data = ptr->data.txt_reply.next; 87 ares_free(ptr->data.txt_reply.txt); 88 break; 89 90 case ARES_DATATYPE_ADDR_NODE: 91 next_data = ptr->data.addr_node.next; 92 break; 93 94 case ARES_DATATYPE_ADDR_PORT_NODE: 95 next_data = ptr->data.addr_port_node.next; 96 break; 97 98 case ARES_DATATYPE_NAPTR_REPLY: 99 next_data = ptr->data.naptr_reply.next; 100 ares_free(ptr->data.naptr_reply.flags); 101 ares_free(ptr->data.naptr_reply.service); 102 ares_free(ptr->data.naptr_reply.regexp); 103 ares_free(ptr->data.naptr_reply.replacement); 104 break; 105 106 case ARES_DATATYPE_SOA_REPLY: 107 ares_free(ptr->data.soa_reply.nsname); 108 ares_free(ptr->data.soa_reply.hostmaster); 109 break; 110 111 case ARES_DATATYPE_CAA_REPLY: 112 next_data = ptr->data.caa_reply.next; 113 ares_free(ptr->data.caa_reply.property); 114 ares_free(ptr->data.caa_reply.value); 115 break; 116 117 default: 118 return; 119 } 120 121 ares_free(ptr); 122 dataptr = next_data; 123 } 124 } 125 126 /* 127 ** ares_malloc_data() - c-ares internal helper function. 128 ** 129 ** This function allocates memory for a c-ares private ares_data struct 130 ** for the specified ares_datatype, initializes c-ares private fields 131 ** and zero initializes those which later might be used from the public 132 ** API. It returns an interior pointer which can be passed by c-ares 133 ** functions to the calling application, and that must be free'ed using 134 ** c-ares external API function ares_free_data(). 135 */ 136 137 void *ares_malloc_data(ares_datatype type) 138 { 139 struct ares_data *ptr; 140 141 ptr = ares_malloc_zero(sizeof(*ptr)); 142 if (!ptr) { 143 return NULL; 144 } 145 146 switch (type) { 147 case ARES_DATATYPE_MX_REPLY: 148 case ARES_DATATYPE_SRV_REPLY: 149 case ARES_DATATYPE_URI_REPLY: 150 case ARES_DATATYPE_TXT_EXT: 151 case ARES_DATATYPE_TXT_REPLY: 152 case ARES_DATATYPE_CAA_REPLY: 153 case ARES_DATATYPE_ADDR_NODE: 154 case ARES_DATATYPE_ADDR_PORT_NODE: 155 case ARES_DATATYPE_NAPTR_REPLY: 156 case ARES_DATATYPE_SOA_REPLY: 157 break; 158 159 default: 160 ares_free(ptr); 161 return NULL; 162 } 163 164 ptr->mark = ARES_DATATYPE_MARK; 165 ptr->type = type; 166 167 return &ptr->data; 168 }