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95 lines
2.8 KiB
95 lines
2.8 KiB
/*
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Copyright (c) 2012-2013 Martin Sustrik All rights reserved.
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"),
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to deal in the Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute, sublicense,
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and/or sell copies of the Software, and to permit persons to whom
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the Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included
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in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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IN THE SOFTWARE.
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*/
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#include "dns.h"
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#include "../../utils/err.h"
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#include <string.h>
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int nn_dns_check_hostname (const char *name, size_t namelen)
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{
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int labelsz;
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/* There has to be at least one label in the hostname.
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Additionally, hostnames are up to 255 characters long. */
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if (namelen < 1 || namelen > 255)
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return -EINVAL;
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/* Hyphen can't be used as a first character of the hostname. */
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if (*name == '-')
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return -EINVAL;
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labelsz = 0;
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while (1) {
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/* End of the hostname. */
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if (namelen == 0) {
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/* The last label cannot be empty. */
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if (labelsz == 0)
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return -EINVAL;
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/* Success! */
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return 0;
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}
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/* End of a label. */
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if (*name == '.') {
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/* The old label cannot be empty. */
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if (labelsz == 0)
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return -EINVAL;
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/* Start new label. */
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labelsz = 0;
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++name;
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--namelen;
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continue;
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}
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/* Valid character. */
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if ((*name >= 'a' && *name <= 'z') ||
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(*name >= 'A' && *name <= 'Z') ||
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(*name >= '0' && *name <= '9') ||
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*name == '-') {
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++name;
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--namelen;
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++labelsz;
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/* Labels longer than 63 charcters are not permitted. */
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if (labelsz > 63)
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return -EINVAL;
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continue;
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}
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/* Invalid character. */
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return -EINVAL;
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}
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}
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#if defined NN_HAVE_GETADDRINFO_A && !defined NN_DISABLE_GETADDRINFO_A
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#include "dns_getaddrinfo_a.c"
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#else
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#include "dns_getaddrinfo.c"
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#endif
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