quickjs-tart

quickjs-based runtime for wallet-core logic
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ares_expand_name.c (3082B)

      1 /* MIT License
      2  *
      3  * Copyright (c) 1998, 2011 Massachusetts Institute of Technology
      4  * Copyright (c) The c-ares project and its contributors
      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 
     34 #include "ares_nameser.h"
     35 
     36 ares_status_t ares_expand_name_validated(const unsigned char *encoded,
     37                                          const unsigned char *abuf, size_t alen,
     38                                          char **s, size_t *enclen,
     39                                          ares_bool_t is_hostname)
     40 {
     41   ares_status_t status;
     42   ares_buf_t   *buf = NULL;
     43   size_t        start_len;
     44 
     45   if (encoded == NULL || abuf == NULL || alen == 0 || enclen == NULL) {
     46     return ARES_EBADNAME; /* EFORMERR would be better */
     47   }
     48 
     49   if (encoded < abuf || encoded >= abuf + alen) {
     50     return ARES_EBADNAME; /* EFORMERR would be better */
     51   }
     52 
     53   *enclen = 0;
     54 
     55   /* NOTE: we allow 's' to be NULL to skip it */
     56   if (s) {
     57     *s = NULL;
     58   }
     59 
     60   buf = ares_buf_create_const(abuf, alen);
     61 
     62   if (buf == NULL) {
     63     return ARES_ENOMEM;
     64   }
     65 
     66   status = ares_buf_set_position(buf, (size_t)(encoded - abuf));
     67   if (status != ARES_SUCCESS) {
     68     goto done;
     69   }
     70 
     71   start_len = ares_buf_len(buf);
     72   status    = ares_dns_name_parse(buf, s, is_hostname);
     73   if (status != ARES_SUCCESS) {
     74     goto done;
     75   }
     76 
     77   *enclen = start_len - ares_buf_len(buf);
     78 
     79 done:
     80   ares_buf_destroy(buf);
     81   return status;
     82 }
     83 
     84 int ares_expand_name(const unsigned char *encoded, const unsigned char *abuf,
     85                      int alen, char **s, long *enclen)
     86 {
     87   /* Keep public API compatible */
     88   size_t        enclen_temp = 0;
     89   ares_status_t status;
     90 
     91   if (encoded == NULL || abuf == NULL || alen <= 0 || enclen == NULL) {
     92     return ARES_EBADNAME;
     93   }
     94 
     95   status  = ares_expand_name_validated(encoded, abuf, (size_t)alen, s,
     96                                        &enclen_temp, ARES_FALSE);
     97   *enclen = (long)enclen_temp;
     98   return (int)status;
     99 }