68 lines
2.0 KiB
C
68 lines
2.0 KiB
C
/* ----------------------------------------------------------------------- *
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*
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* Copyright 2010 Intel Corporation; author: H. Peter Anvin
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use,
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* copy, modify, merge, publish, distribute, sublicense, and/or
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* 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
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* conditions:
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*
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* The above copyright notice and this permission notice shall
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* be included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* 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
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* ----------------------------------------------------------------------- */
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/*
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* pxe_dns.c
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*
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* Resolve a hostname via DNS
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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#include <com32.h>
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#include <syslinux/pxe.h>
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/* Returns the status code from PXE (0 on success),
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or -1 on invocation failure */
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uint32_t pxe_dns(const char *hostname)
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{
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union {
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unsigned char b[4];
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uint32_t ip;
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} q;
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char *lm_hostname;
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uint32_t status;
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/* Is this a dot-quad? */
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if (sscanf(hostname, "%hhu.%hhu.%hhu.%hhu",
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&q.b[0], &q.b[1], &q.b[2], &q.b[3]) == 4)
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return q.ip;
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lm_hostname = lstrdup(hostname);
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if (!lm_hostname)
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return 0;
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status = dns_resolv(lm_hostname);
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lfree(lm_hostname);
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return status;
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}
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