Gilad Arnold | 968bf19 | 2015-07-17 00:23:30 -0700 | [diff] [blame] | 1 | |
| 2 | /* Copyright (C) 2009-2010 by Daniel Stenberg |
| 3 | * |
| 4 | * Permission to use, copy, modify, and distribute this |
| 5 | * software and its documentation for any purpose and without |
| 6 | * fee is hereby granted, provided that the above copyright |
| 7 | * notice appear in all copies and that both that copyright |
| 8 | * notice and this permission notice appear in supporting |
| 9 | * documentation, and that the name of M.I.T. not be used in |
| 10 | * advertising or publicity pertaining to distribution of the |
| 11 | * software without specific, written prior permission. |
| 12 | * M.I.T. makes no representations about the suitability of |
| 13 | * this software for any purpose. It is provided "as is" |
| 14 | * without express or implied warranty. |
| 15 | */ |
| 16 | |
| 17 | |
| 18 | #include "ares_setup.h" |
| 19 | |
| 20 | #include <stddef.h> |
| 21 | |
| 22 | #include "ares.h" |
| 23 | #include "ares_data.h" |
| 24 | #include "ares_private.h" |
| 25 | |
| 26 | |
| 27 | /* |
| 28 | ** ares_free_data() - c-ares external API function. |
| 29 | ** |
| 30 | ** This function must be used by the application to free data memory that |
| 31 | ** has been internally allocated by some c-ares function and for which a |
| 32 | ** pointer has already been returned to the calling application. The list |
| 33 | ** of c-ares functions returning pointers that must be free'ed using this |
| 34 | ** function is: |
| 35 | ** |
| 36 | ** ares_get_servers() |
| 37 | ** ares_parse_srv_reply() |
| 38 | ** ares_parse_txt_reply() |
| 39 | */ |
| 40 | |
| 41 | void ares_free_data(void *dataptr) |
| 42 | { |
| 43 | struct ares_data *ptr; |
| 44 | |
| 45 | if (!dataptr) |
| 46 | return; |
| 47 | |
| 48 | #ifdef __INTEL_COMPILER |
| 49 | # pragma warning(push) |
| 50 | # pragma warning(disable:1684) |
| 51 | /* 1684: conversion from pointer to same-sized integral type */ |
| 52 | #endif |
| 53 | |
| 54 | ptr = (void *)((char *)dataptr - offsetof(struct ares_data, data)); |
| 55 | |
| 56 | #ifdef __INTEL_COMPILER |
| 57 | # pragma warning(pop) |
| 58 | #endif |
| 59 | |
| 60 | if (ptr->mark != ARES_DATATYPE_MARK) |
| 61 | return; |
| 62 | |
| 63 | switch (ptr->type) |
| 64 | { |
| 65 | case ARES_DATATYPE_MX_REPLY: |
| 66 | |
| 67 | if (ptr->data.mx_reply.next) |
| 68 | ares_free_data(ptr->data.mx_reply.next); |
| 69 | if (ptr->data.mx_reply.host) |
| 70 | free(ptr->data.mx_reply.host); |
| 71 | break; |
| 72 | |
| 73 | case ARES_DATATYPE_SRV_REPLY: |
| 74 | |
| 75 | if (ptr->data.srv_reply.next) |
| 76 | ares_free_data(ptr->data.srv_reply.next); |
| 77 | if (ptr->data.srv_reply.host) |
| 78 | free(ptr->data.srv_reply.host); |
| 79 | break; |
| 80 | |
| 81 | case ARES_DATATYPE_TXT_REPLY: |
| 82 | |
| 83 | if (ptr->data.txt_reply.next) |
| 84 | ares_free_data(ptr->data.txt_reply.next); |
| 85 | if (ptr->data.txt_reply.txt) |
| 86 | free(ptr->data.txt_reply.txt); |
| 87 | break; |
| 88 | |
| 89 | case ARES_DATATYPE_ADDR_NODE: |
| 90 | |
| 91 | if (ptr->data.addr_node.next) |
| 92 | ares_free_data(ptr->data.addr_node.next); |
| 93 | break; |
| 94 | |
| 95 | default: |
| 96 | return; |
| 97 | } |
| 98 | |
| 99 | free(ptr); |
| 100 | } |
| 101 | |
| 102 | |
| 103 | /* |
| 104 | ** ares_malloc_data() - c-ares internal helper function. |
| 105 | ** |
| 106 | ** This function allocates memory for a c-ares private ares_data struct |
| 107 | ** for the specified ares_datatype, initializes c-ares private fields |
| 108 | ** and zero initializes those which later might be used from the public |
| 109 | ** API. It returns an interior pointer which can be passed by c-ares |
| 110 | ** functions to the calling application, and that must be free'ed using |
| 111 | ** c-ares external API function ares_free_data(). |
| 112 | */ |
| 113 | |
| 114 | void *ares_malloc_data(ares_datatype type) |
| 115 | { |
| 116 | struct ares_data *ptr; |
| 117 | |
| 118 | ptr = malloc(sizeof(struct ares_data)); |
| 119 | if (!ptr) |
| 120 | return NULL; |
| 121 | |
| 122 | switch (type) |
| 123 | { |
| 124 | case ARES_DATATYPE_MX_REPLY: |
| 125 | ptr->data.mx_reply.next = NULL; |
| 126 | ptr->data.mx_reply.host = NULL; |
| 127 | ptr->data.mx_reply.priority = 0; |
| 128 | break; |
| 129 | |
| 130 | case ARES_DATATYPE_SRV_REPLY: |
| 131 | ptr->data.srv_reply.next = NULL; |
| 132 | ptr->data.srv_reply.host = NULL; |
| 133 | ptr->data.srv_reply.priority = 0; |
| 134 | ptr->data.srv_reply.weight = 0; |
| 135 | ptr->data.srv_reply.port = 0; |
| 136 | break; |
| 137 | |
| 138 | case ARES_DATATYPE_TXT_REPLY: |
| 139 | ptr->data.txt_reply.next = NULL; |
| 140 | ptr->data.txt_reply.txt = NULL; |
| 141 | ptr->data.txt_reply.length = 0; |
| 142 | break; |
| 143 | |
| 144 | case ARES_DATATYPE_ADDR_NODE: |
| 145 | ptr->data.addr_node.next = NULL; |
| 146 | ptr->data.addr_node.family = 0; |
| 147 | memset(&ptr->data.addr_node.addrV6, 0, |
| 148 | sizeof(ptr->data.addr_node.addrV6)); |
| 149 | break; |
| 150 | |
| 151 | default: |
| 152 | free(ptr); |
| 153 | return NULL; |
| 154 | } |
| 155 | |
| 156 | ptr->mark = ARES_DATATYPE_MARK; |
| 157 | ptr->type = type; |
| 158 | |
| 159 | return &ptr->data; |
| 160 | } |
| 161 | |
| 162 | |
| 163 | /* |
| 164 | ** ares_get_datatype() - c-ares internal helper function. |
| 165 | ** |
| 166 | ** This function returns the ares_datatype of the data stored in a |
| 167 | ** private ares_data struct when given the public API pointer. |
| 168 | */ |
| 169 | |
| 170 | ares_datatype ares_get_datatype(void * dataptr) |
| 171 | { |
| 172 | struct ares_data *ptr; |
| 173 | |
| 174 | #ifdef __INTEL_COMPILER |
| 175 | # pragma warning(push) |
| 176 | # pragma warning(disable:1684) |
| 177 | /* 1684: conversion from pointer to same-sized integral type */ |
| 178 | #endif |
| 179 | |
| 180 | ptr = (void *)((char *)dataptr - offsetof(struct ares_data, data)); |
| 181 | |
| 182 | #ifdef __INTEL_COMPILER |
| 183 | # pragma warning(pop) |
| 184 | #endif |
| 185 | |
| 186 | if (ptr->mark == ARES_DATATYPE_MARK) |
| 187 | return ptr->type; |
| 188 | |
| 189 | return ARES_DATATYPE_UNKNOWN; |
| 190 | } |