/* Copyright (C) 2009-2013 by Daniel Stenberg

 *

 * Permission to use, copy, modify, and distribute this

 * software and its documentation for any purpose and without

 * fee is hereby granted, provided that the above copyright

 * notice appear in all copies and that both that copyright

 * notice and this permission notice appear in supporting

 * documentation, and that the name of M.I.T. not be used in

 * advertising or publicity pertaining to distribution of the

 * software without specific, written prior permission.

 * M.I.T. makes no representations about the suitability of

 * this software for any purpose.  It is provided "as is"

 * without express or implied warranty.

 */

#include "ares_setup.h"

#include <stddef.h>

#include "ares.h"

#include "ares_data.h"

#include "ares_private.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)

{

  struct ares_data *ptr;

  if (!dataptr)

    return;

#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:

        if (ptr->data.mx_reply.next)

          ares_free_data(ptr->data.mx_reply.next);

        if (ptr->data.mx_reply.host)

          ares_free(ptr->data.mx_reply.host);

        break;

      case ARES_DATATYPE_SRV_REPLY:

        if (ptr->data.srv_reply.next)

          ares_free_data(ptr->data.srv_reply.next);

        if (ptr->data.srv_reply.host)

          ares_free(ptr->data.srv_reply.host);

        break;

      case ARES_DATATYPE_TXT_REPLY:

      case ARES_DATATYPE_TXT_EXT:

        if (ptr->data.txt_reply.next)

          ares_free_data(ptr->data.txt_reply.next);

        if (ptr->data.txt_reply.txt)

          ares_free(ptr->data.txt_reply.txt);

        break;

      case ARES_DATATYPE_ADDR_NODE:

        if (ptr->data.addr_node.next)

          ares_free_data(ptr->data.addr_node.next);

        break;

      case ARES_DATATYPE_ADDR_PORT_NODE:

        if (ptr->data.addr_port_node.next)

          ares_free_data(ptr->data.addr_port_node.next);

        break;

      case ARES_DATATYPE_NAPTR_REPLY:

        if (ptr->data.naptr_reply.next)

          ares_free_data(ptr->data.naptr_reply.next);

        if (ptr->data.naptr_reply.flags)

          ares_free(ptr->data.naptr_reply.flags);

        if (ptr->data.naptr_reply.service)

          ares_free(ptr->data.naptr_reply.service);

        if (ptr->data.naptr_reply.regexp)

          ares_free(ptr->data.naptr_reply.regexp);

        if (ptr->data.naptr_reply.replacement)

          ares_free(ptr->data.naptr_reply.replacement);

        break;

      case ARES_DATATYPE_SOA_REPLY:

        if (ptr->data.soa_reply.nsname)

          ares_free(ptr->data.soa_reply.nsname);

        if (ptr->data.soa_reply.hostmaster)

          ares_free(ptr->data.soa_reply.hostmaster);

	break;

      default:

        return;

    }

  ares_free(ptr);

}

/*

** 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(sizeof(struct ares_data));

  if (!ptr)

    return NULL;

  switch (type)

    {

      case ARES_DATATYPE_MX_REPLY:

        ptr->data.mx_reply.next = NULL;

        ptr->data.mx_reply.host = NULL;

        ptr->data.mx_reply.priority = 0;

        break;

      case ARES_DATATYPE_SRV_REPLY:

        ptr->data.srv_reply.next = NULL;

        ptr->data.srv_reply.host = NULL;

        ptr->data.srv_reply.priority = 0;

        ptr->data.srv_reply.weight = 0;

        ptr->data.srv_reply.port = 0;

        break;

      case ARES_DATATYPE_TXT_EXT:

        ptr->data.txt_ext.record_start = 0;

        /* FALLTHROUGH */

      case ARES_DATATYPE_TXT_REPLY:

        ptr->data.txt_reply.next = NULL;

        ptr->data.txt_reply.txt = NULL;

        ptr->data.txt_reply.length = 0;

        break;

      case ARES_DATATYPE_ADDR_NODE:

        ptr->data.addr_node.next = NULL;

        ptr->data.addr_node.family = 0;

        memset(&ptr->data.addr_node.addrV6, 0,

               sizeof(ptr->data.addr_node.addrV6));

        break;

      case ARES_DATATYPE_ADDR_PORT_NODE:

        ptr->data.addr_port_node.next = NULL;

        ptr->data.addr_port_node.family = 0;

        ptr->data.addr_port_node.udp_port = 0;

        ptr->data.addr_port_node.tcp_port = 0;

        memset(&ptr->data.addr_port_node.addrV6, 0,

               sizeof(ptr->data.addr_port_node.addrV6));

        break;

      case ARES_DATATYPE_NAPTR_REPLY:

        ptr->data.naptr_reply.next = NULL;

        ptr->data.naptr_reply.flags = NULL;

        ptr->data.naptr_reply.service = NULL;

        ptr->data.naptr_reply.regexp = NULL;

        ptr->data.naptr_reply.replacement = NULL;

        ptr->data.naptr_reply.order = 0;

        ptr->data.naptr_reply.preference = 0;

        break;

      case ARES_DATATYPE_SOA_REPLY:

        ptr->data.soa_reply.nsname = NULL;

        ptr->data.soa_reply.hostmaster = NULL;

        ptr->data.soa_reply.serial = 0;

        ptr->data.soa_reply.refresh = 0;

        ptr->data.soa_reply.retry = 0;

        ptr->data.soa_reply.expire = 0;

        ptr->data.soa_reply.minttl = 0;

	break;

      default:

        ares_free(ptr);

        return NULL;

    }

  ptr->mark = ARES_DATATYPE_MARK;

  ptr->type = type;

  return &ptr->data;

}