quickjs-tart

quickjs-based runtime for wallet-core logic
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ares_parse_a_reply.c (3063B)

      1 /* MIT License
      2  *
      3  * Copyright (c) 1998 Massachusetts Institute of Technology
      4  * Copyright (c) 2019 Andrew Selivanov
      5  *
      6  * Permission is hereby granted, free of charge, to any person obtaining a copy
      7  * of this software and associated documentation files (the "Software"), to deal
      8  * in the Software without restriction, including without limitation the rights
      9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     10  * copies of the Software, and to permit persons to whom the Software is
     11  * furnished to do so, subject to the following conditions:
     12  *
     13  * The above copyright notice and this permission notice (including the next
     14  * paragraph) shall be included in all copies or substantial portions of the
     15  * Software.
     16  *
     17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
     20  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
     22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
     23  * SOFTWARE.
     24  *
     25  * SPDX-License-Identifier: MIT
     26  */
     27 
     28 #include "ares_private.h"
     29 
     30 #ifdef HAVE_NETINET_IN_H
     31 #  include <netinet/in.h>
     32 #endif
     33 #ifdef HAVE_NETDB_H
     34 #  include <netdb.h>
     35 #endif
     36 #ifdef HAVE_ARPA_INET_H
     37 #  include <arpa/inet.h>
     38 #endif
     39 
     40 #ifdef HAVE_STRINGS_H
     41 #  include <strings.h>
     42 #endif
     43 
     44 #ifdef HAVE_LIMITS_H
     45 #  include <limits.h>
     46 #endif
     47 
     48 int ares_parse_a_reply(const unsigned char *abuf, int alen,
     49                        struct hostent **host, struct ares_addrttl *addrttls,
     50                        int *naddrttls)
     51 {
     52   struct ares_addrinfo ai;
     53   char                *question_hostname = NULL;
     54   ares_status_t        status;
     55   size_t               req_naddrttls = 0;
     56   ares_dns_record_t   *dnsrec        = NULL;
     57 
     58   if (alen < 0) {
     59     return ARES_EBADRESP;
     60   }
     61 
     62   if (naddrttls) {
     63     req_naddrttls = (size_t)*naddrttls;
     64     *naddrttls    = 0;
     65   }
     66 
     67   memset(&ai, 0, sizeof(ai));
     68 
     69   status = ares_dns_parse(abuf, (size_t)alen, 0, &dnsrec);
     70   if (status != ARES_SUCCESS) {
     71     goto fail;
     72   }
     73 
     74   status = ares_parse_into_addrinfo(dnsrec, 0, 0, &ai);
     75   if (status != ARES_SUCCESS && status != ARES_ENODATA) {
     76     goto fail;
     77   }
     78 
     79   if (host != NULL) {
     80     *host  = NULL;
     81     status = ares_addrinfo2hostent(&ai, AF_INET, host);
     82     if (status != ARES_SUCCESS && status != ARES_ENODATA) {
     83       goto fail; /* LCOV_EXCL_LINE: DefensiveCoding */
     84     }
     85   }
     86 
     87   if (addrttls != NULL && req_naddrttls) {
     88     size_t temp_naddrttls = 0;
     89     ares_addrinfo2addrttl(&ai, AF_INET, req_naddrttls, addrttls, NULL,
     90                           &temp_naddrttls);
     91     *naddrttls = (int)temp_naddrttls;
     92   }
     93 
     94 
     95 fail:
     96   ares_freeaddrinfo_cnames(ai.cnames);
     97   ares_freeaddrinfo_nodes(ai.nodes);
     98   ares_free(ai.name);
     99   ares_free(question_hostname);
    100   ares_dns_record_destroy(dnsrec);
    101 
    102   if (status == ARES_EBADNAME) {
    103     status = ARES_EBADRESP;
    104   }
    105 
    106   return (int)status;
    107 }