1 /* ----------------------------------------------------------------------- * 2 * 3 * Copyright 2010 Intel Corporation; author: H. Peter Anvin 4 * 5 * Permission is hereby granted, free of charge, to any person 6 * obtaining a copy of this software and associated documentation 7 * files (the "Software"), to deal in the Software without 8 * restriction, including without limitation the rights to use, 9 * copy, modify, merge, publish, distribute, sublicense, and/or 10 * sell copies of the Software, and to permit persons to whom 11 * the Software is furnished to do so, subject to the following 12 * conditions: 13 * 14 * The above copyright notice and this permission notice shall 15 * be included in all copies or substantial portions of the Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 18 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES 19 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 20 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT 21 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 22 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 23 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 24 * OTHER DEALINGS IN THE SOFTWARE. 25 * 26 * ----------------------------------------------------------------------- */ 27 28 /* 29 * pxe_dns.c 30 * 31 * Resolve a hostname via DNS 32 */ 33 34 #include <stdio.h> 35 #include <stdlib.h> 36 #include <stdint.h> 37 #include <string.h> 38 #include <com32.h> 39 40 #include <syslinux/pxe.h> 41 42 /* Returns the status code from PXE (0 on success), 43 or -1 on invocation failure */ 44 uint32_t pxe_dns(const char *hostname) 45 { 46 union { 47 unsigned char b[4]; 48 uint32_t ip; 49 } q; 50 char *lm_hostname; 51 uint32_t status; 52 53 /* Is this a dot-quad? */ 54 if (sscanf(hostname, "%hhu.%hhu.%hhu.%hhu", 55 &q.b[0], &q.b[1], &q.b[2], &q.b[3]) == 4) 56 return q.ip; 57 58 lm_hostname = lstrdup(hostname); 59 if (!lm_hostname) 60 return 0; 61 62 status = dns_resolv(lm_hostname); 63 64 lfree(lm_hostname); 65 66 return status; 67 } 68
