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/* Copyright 1998 by the Massachusetts Institute of Technology.
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* Copyright (C) 2009 by Jakub Hrozek <jhrozek@redhat.com>
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*
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* Permission to use, copy, modify, and distribute this
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* software and its documentation for any purpose and without
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* fee is hereby granted, provided that the above copyright
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* notice appear in all copies and that both that copyright
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* notice and this permission notice appear in supporting
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* documentation, and that the name of M.I.T. not be used in
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* advertising or publicity pertaining to distribution of the
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* software without specific, written prior permission.
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* M.I.T. makes no representations about the suitability of
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* this software for any purpose. It is provided "as is"
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* without express or implied warranty.
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*/
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#include "ares_setup.h"
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#ifdef HAVE_NETINET_IN_H
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# include <netinet/in.h>
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#endif
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#ifdef HAVE_NETDB_H
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# include <netdb.h>
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#endif
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#ifdef HAVE_ARPA_INET_H
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# include <arpa/inet.h>
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#endif
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#ifdef HAVE_ARPA_NAMESER_H
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# include <arpa/nameser.h>
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#else
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# include "nameser.h"
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#endif
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#ifdef HAVE_ARPA_NAMESER_COMPAT_H
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# include <arpa/nameser_compat.h>
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#endif
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#ifdef HAVE_STRINGS_H
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# include <strings.h>
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#endif
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#include "ares.h"
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#include "ares_dns.h"
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#include "ares_data.h"
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#include "ares_private.h"
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static int
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ares__parse_txt_reply (const unsigned char *abuf, int alen,
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int ex, void **txt_out)
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{
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size_t substr_len;
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unsigned int qdcount, ancount, i;
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const unsigned char *aptr;
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const unsigned char *strptr;
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int status, rr_type, rr_class, rr_len;
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long len;
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char *hostname = NULL, *rr_name = NULL;
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struct ares_txt_ext *txt_head = NULL;
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struct ares_txt_ext *txt_last = NULL;
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struct ares_txt_ext *txt_curr;
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/* Set *txt_out to NULL for all failure cases. */
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*txt_out = NULL;
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/* Give up if abuf doesn't have room for a header. */
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if (alen < HFIXEDSZ)
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return ARES_EBADRESP;
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/* Fetch the question and answer count from the header. */
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qdcount = DNS_HEADER_QDCOUNT (abuf);
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ancount = DNS_HEADER_ANCOUNT (abuf);
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if (qdcount != 1)
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return ARES_EBADRESP;
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if (ancount == 0)
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return ARES_ENODATA;
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/* Expand the name from the question, and skip past the question. */
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aptr = abuf + HFIXEDSZ;
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status = ares_expand_name (aptr, abuf, alen, &hostname, &len;;
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if (status != ARES_SUCCESS)
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return status;
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if (aptr + len + QFIXEDSZ > abuf + alen)
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{
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ares_free (hostname);
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return ARES_EBADRESP;
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}
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aptr += len + QFIXEDSZ;
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/* Examine each answer resource record (RR) in turn. */
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for (i = 0; i < ancount; i++)
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{
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/* Decode the RR up to the data field. */
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status = ares_expand_name (aptr, abuf, alen, &rr_name, &len;;
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if (status != ARES_SUCCESS)
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{
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break;
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}
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aptr += len;
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if (aptr + RRFIXEDSZ > abuf + alen)
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{
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status = ARES_EBADRESP;
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break;
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}
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rr_type = DNS_RR_TYPE (aptr);
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rr_class = DNS_RR_CLASS (aptr);
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rr_len = DNS_RR_LEN (aptr);
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aptr += RRFIXEDSZ;
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if (aptr + rr_len > abuf + alen)
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{
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status = ARES_EBADRESP;
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break;
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}
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/* Check if we are really looking at a TXT record */
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if (rr_class == C_IN && rr_type == T_TXT)
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{
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/*
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* There may be multiple substrings in a single TXT record. Each
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* substring may be up to 255 characters in length, with a
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* "length byte" indicating the size of the substring payload.
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* RDATA contains both the length-bytes and payloads of all
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* substrings contained therein.
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*/
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strptr = aptr;
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while (strptr < (aptr + rr_len))
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{
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substr_len = (unsigned char)*strptr;
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if (strptr + substr_len + 1 > aptr + rr_len)
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{
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status = ARES_EBADRESP;
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break;
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}
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/* Allocate storage for this TXT answer appending it to the list */
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txt_curr = ares_malloc_data(ex ? ARES_DATATYPE_TXT_EXT :
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ARES_DATATYPE_TXT_REPLY);
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if (!txt_curr)
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{
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status = ARES_ENOMEM;
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break;
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}
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if (txt_last)
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{
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txt_last->next = txt_curr;
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}
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else
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{
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txt_head = txt_curr;
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}
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txt_last = txt_curr;
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if (ex)
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txt_curr->record_start = (strptr == aptr);
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txt_curr->length = substr_len;
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txt_curr->txt = ares_malloc (substr_len + 1/* Including null byte */);
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if (txt_curr->txt == NULL)
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{
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status = ARES_ENOMEM;
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break;
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}
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++strptr;
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memcpy ((char *) txt_curr->txt, strptr, substr_len);
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/* Make sure we NULL-terminate */
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txt_curr->txt[substr_len] = 0;
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strptr += substr_len;
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}
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}
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/* Propagate any failures */
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if (status != ARES_SUCCESS)
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{
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break;
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}
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/* Don't lose memory in the next iteration */
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ares_free (rr_name);
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rr_name = NULL;
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/* Move on to the next record */
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aptr += rr_len;
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}
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if (hostname)
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ares_free (hostname);
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if (rr_name)
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ares_free (rr_name);
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/* clean up on error */
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if (status != ARES_SUCCESS)
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{
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if (txt_head)
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ares_free_data (txt_head);
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return status;
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}
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/* everything looks fine, return the data */
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*txt_out = txt_head;
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return ARES_SUCCESS;
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}
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int
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ares_parse_txt_reply (const unsigned char *abuf, int alen,
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struct ares_txt_reply **txt_out)
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{
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return ares__parse_txt_reply(abuf, alen, 0, (void **) txt_out);
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}
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int
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ares_parse_txt_reply_ext (const unsigned char *abuf, int alen,
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struct ares_txt_ext **txt_out)
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{
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return ares__parse_txt_reply(abuf, alen, 1, (void **) txt_out);
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}
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