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/* MIT License
*
* Copyright (c) 1998 Massachusetts Institute of Technology
* Copyright (c) The c-ares project and its contributors
*
* 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"
#ifdef HAVE_NETINET_IN_H
# include <netinet/in.h>
#endif
#include "ares_nameser.h"
/* Simply decodes a length-encoded character string. The first byte of the
* input is the length of the string to be returned and the bytes thereafter
* are the characters of the string. The returned result will be NULL
* terminated.
*/
ares_status_t ares_expand_string_ex(const unsigned char *encoded,
const unsigned char *abuf, size_t alen,
unsigned char **s, size_t *enclen)
{
ares_status_t status;
ares_buf_t *buf = NULL;
size_t start_len;
size_t len = 0;
if (encoded == NULL || abuf == NULL || alen == 0 || enclen == NULL) {
return ARES_EBADSTR; /* EFORMERR would be better */
}
if (encoded < abuf || encoded >= abuf + alen) {
return ARES_EBADSTR; /* EFORMERR would be better */
}
*enclen = 0;
/* NOTE: we allow 's' to be NULL to skip it */
if (s) {
*s = NULL;
}
buf = ares_buf_create_const(abuf, alen);
if (buf == NULL) {
return ARES_ENOMEM;
}
status = ares_buf_set_position(buf, (size_t)(encoded - abuf));
if (status != ARES_SUCCESS) {
goto done;
}
start_len = ares_buf_len(buf);
status = ares_buf_parse_dns_binstr(buf, ares_buf_len(buf), s, &len);
/* hrm, no way to pass back 'len' with the prototype */
if (status != ARES_SUCCESS) {
goto done;
}
*enclen = start_len - ares_buf_len(buf);
done:
ares_buf_destroy(buf);
if (status == ARES_EBADNAME || status == ARES_EBADRESP) {
status = ARES_EBADSTR;
}
return status;
}
int ares_expand_string(const unsigned char *encoded, const unsigned char *abuf,
int alen, unsigned char **s, long *enclen)
{
ares_status_t status;
size_t temp_enclen = 0;
if (encoded == NULL || abuf == NULL || alen <= 0 || enclen == NULL) {
return ARES_EBADRESP;
}
status = ares_expand_string_ex(encoded, abuf, (size_t)alen, s, &temp_enclen);
*enclen = (long)temp_enclen;
return (int)status;
}
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