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/* MIT License
*
* Copyright (c) 2009 Daniel Stenberg
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* SPDX-License-Identifier: MIT
*/
#include "ares_private.h"
#include <stddef.h>
#include <assert.h>
#include "ares_data.h"
/*
** ares_free_data() - c-ares external API function.
**
** This function must be used by the application to free data memory that
** has been internally allocated by some c-ares function and for which a
** pointer has already been returned to the calling application. The list
** of c-ares functions returning pointers that must be free'ed using this
** function is:
**
** ares_get_servers()
** ares_parse_srv_reply()
** ares_parse_txt_reply()
*/
void ares_free_data(void *dataptr)
{
while (dataptr != NULL) {
struct ares_data *ptr;
void *next_data = NULL;
#ifdef __INTEL_COMPILER
# pragma warning(push)
# pragma warning(disable : 1684)
/* 1684: conversion from pointer to same-sized integral type */
#endif
ptr = (void *)((char *)dataptr - offsetof(struct ares_data, data));
#ifdef __INTEL_COMPILER
# pragma warning(pop)
#endif
if (ptr->mark != ARES_DATATYPE_MARK) {
return;
}
switch (ptr->type) {
case ARES_DATATYPE_MX_REPLY:
next_data = ptr->data.mx_reply.next;
ares_free(ptr->data.mx_reply.host);
break;
case ARES_DATATYPE_SRV_REPLY:
next_data = ptr->data.srv_reply.next;
ares_free(ptr->data.srv_reply.host);
break;
case ARES_DATATYPE_URI_REPLY:
next_data = ptr->data.uri_reply.next;
ares_free(ptr->data.uri_reply.uri);
break;
case ARES_DATATYPE_TXT_REPLY:
case ARES_DATATYPE_TXT_EXT:
next_data = ptr->data.txt_reply.next;
ares_free(ptr->data.txt_reply.txt);
break;
case ARES_DATATYPE_ADDR_NODE:
next_data = ptr->data.addr_node.next;
break;
case ARES_DATATYPE_ADDR_PORT_NODE:
next_data = ptr->data.addr_port_node.next;
break;
case ARES_DATATYPE_NAPTR_REPLY:
next_data = ptr->data.naptr_reply.next;
ares_free(ptr->data.naptr_reply.flags);
ares_free(ptr->data.naptr_reply.service);
ares_free(ptr->data.naptr_reply.regexp);
ares_free(ptr->data.naptr_reply.replacement);
break;
case ARES_DATATYPE_SOA_REPLY:
ares_free(ptr->data.soa_reply.nsname);
ares_free(ptr->data.soa_reply.hostmaster);
break;
case ARES_DATATYPE_CAA_REPLY:
next_data = ptr->data.caa_reply.next;
ares_free(ptr->data.caa_reply.property);
ares_free(ptr->data.caa_reply.value);
break;
default:
return;
}
ares_free(ptr);
dataptr = next_data;
}
}
/*
** ares_malloc_data() - c-ares internal helper function.
**
** This function allocates memory for a c-ares private ares_data struct
** for the specified ares_datatype, initializes c-ares private fields
** and zero initializes those which later might be used from the public
** API. It returns an interior pointer which can be passed by c-ares
** functions to the calling application, and that must be free'ed using
** c-ares external API function ares_free_data().
*/
void *ares_malloc_data(ares_datatype type)
{
struct ares_data *ptr;
ptr = ares_malloc_zero(sizeof(*ptr));
if (!ptr) {
return NULL;
}
switch (type) {
case ARES_DATATYPE_MX_REPLY:
case ARES_DATATYPE_SRV_REPLY:
case ARES_DATATYPE_URI_REPLY:
case ARES_DATATYPE_TXT_EXT:
case ARES_DATATYPE_TXT_REPLY:
case ARES_DATATYPE_CAA_REPLY:
case ARES_DATATYPE_ADDR_NODE:
case ARES_DATATYPE_ADDR_PORT_NODE:
case ARES_DATATYPE_NAPTR_REPLY:
case ARES_DATATYPE_SOA_REPLY:
break;
default:
ares_free(ptr);
return NULL;
}
ptr->mark = ARES_DATATYPE_MARK;
ptr->type = type;
return &ptr->data;
}
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