You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
96 lines
2.8 KiB
96 lines
2.8 KiB
9 years ago
|
/*
|
||
|
|
Copyright (c) 2012-2013 Martin Sustrik All rights reserved.
|
||
|
|
|
||
|
|
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 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.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "dns.h"
|
||
|
|
|
||
|
|
#include "../../utils/err.h"
|
||
|
|
|
||
|
|
#include <string.h>
|
||
|
|
|
||
|
|
int nn_dns_check_hostname (const char *name, size_t namelen)
|
||
|
|
{
|
||
|
|
int labelsz;
|
||
|
|
|
||
|
|
/* There has to be at least one label in the hostname.
|
||
|
|
Additionally, hostnames are up to 255 characters long. */
|
||
|
|
if (namelen < 1 || namelen > 255)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
/* Hyphen can't be used as a first character of the hostname. */
|
||
|
|
if (*name == '-')
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
labelsz = 0;
|
||
|
|
while (1) {
|
||
|
|
|
||
|
|
/* End of the hostname. */
|
||
|
|
if (namelen == 0) {
|
||
|
|
|
||
|
|
/* The last label cannot be empty. */
|
||
|
|
if (labelsz == 0)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
/* Success! */
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* End of a label. */
|
||
|
|
if (*name == '.') {
|
||
|
|
|
||
|
|
/* The old label cannot be empty. */
|
||
|
|
if (labelsz == 0)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
/* Start new label. */
|
||
|
|
labelsz = 0;
|
||
|
|
++name;
|
||
|
|
--namelen;
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Valid character. */
|
||
|
|
if ((*name >= 'a' && *name <= 'z') ||
|
||
|
|
(*name >= 'A' && *name <= 'Z') ||
|
||
|
|
(*name >= '0' && *name <= '9') ||
|
||
|
|
*name == '-') {
|
||
|
|
++name;
|
||
|
|
--namelen;
|
||
|
|
++labelsz;
|
||
|
|
|
||
|
|
/* Labels longer than 63 charcters are not permitted. */
|
||
|
|
if (labelsz > 63)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Invalid character. */
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
#if defined NN_HAVE_GETADDRINFO_A && !defined NN_DISABLE_GETADDRINFO_A
|
||
|
|
#include "dns_getaddrinfo_a.c"
|
||
|
|
#else
|
||
|
|
#include "dns_getaddrinfo.c"
|
||
|
|
#endif
|