diff options
| -rw-r--r-- | com32/lib/Makefile | 1 | ||||
| -rw-r--r-- | com32/lib/syslinux/pxe_dns.c | 70 |
2 files changed, 71 insertions, 0 deletions
diff --git a/com32/lib/Makefile b/com32/lib/Makefile index ff5887b0..9c0a1130 100644 --- a/com32/lib/Makefile +++ b/com32/lib/Makefile @@ -108,6 +108,7 @@ LIBOBJS = \ syslinux/initramfs_archive.o \ \ syslinux/pxe_get_cached.o syslinux/pxe_get_nic.o \ + syslinux/pxe_dns.o \ \ syslinux/adv.o syslinux/advwrite.o syslinux/getadv.o \ syslinux/setadv.o \ diff --git a/com32/lib/syslinux/pxe_dns.c b/com32/lib/syslinux/pxe_dns.c new file mode 100644 index 00000000..9ab95137 --- /dev/null +++ b/com32/lib/syslinux/pxe_dns.c @@ -0,0 +1,70 @@ +/* ----------------------------------------------------------------------- * + * + * 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) +{ + com32sys_t regs; + union { + unsigned char b[4]; + uint32_t ip; + } q; + + /* 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; + + memset(®s, 0, sizeof regs); + regs.eax.w[0] = 0x0010; + regs.es = SEG(__com32.cs_bounce); + regs.ebx.w[0] = OFFS(__com32.cs_bounce); + + strcpy((char *)__com32.cs_bounce, hostname); + + __intcall(0x22, ®s, ®s); + + if (regs.eflags.l & EFLAGS_CF) + return 0; + + return regs.eax.l; +} |