| /* ----------------------------------------------------------------------- * |
| * |
| * Copyright 2010 Intel Corporation; author: H. Peter Anvin |
| * |
| * 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. |
| * |
| * ----------------------------------------------------------------------- */ |
| |
| /* |
| * pxe_dns.c |
| * |
| * Resolve a hostname via DNS |
| */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <stdint.h> |
| #include <string.h> |
| #include <com32.h> |
| |
| #include <syslinux/pxe.h> |
| |
| /* Returns the status code from PXE (0 on success), |
| or -1 on invocation failure */ |
| uint32_t pxe_dns(const char *hostname) |
| { |
| union { |
| unsigned char b[4]; |
| uint32_t ip; |
| } q; |
| char *lm_hostname; |
| uint32_t status; |
| |
| /* Is this a dot-quad? */ |
| if (sscanf(hostname, "%hhu.%hhu.%hhu.%hhu", |
| &q.b[0], &q.b[1], &q.b[2], &q.b[3]) == 4) |
| return q.ip; |
| |
| lm_hostname = lstrdup(hostname); |
| if (!lm_hostname) |
| return 0; |
| |
| status = dns_resolv(lm_hostname); |
| |
| lfree(lm_hostname); |
| |
| return status; |
| } |