diff options
Diffstat (limited to 'contrib/syslinux-4.02/com32/lib/syslinux/pxe_dns.c')
-rw-r--r-- | contrib/syslinux-4.02/com32/lib/syslinux/pxe_dns.c | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/com32/lib/syslinux/pxe_dns.c b/contrib/syslinux-4.02/com32/lib/syslinux/pxe_dns.c new file mode 100644 index 0000000..6620396 --- /dev/null +++ b/contrib/syslinux-4.02/com32/lib/syslinux/pxe_dns.c @@ -0,0 +1,75 @@ +/* ----------------------------------------------------------------------- * + * + * 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; + char *lm_hostname; + + /* 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; + + memset(®s, 0, sizeof regs); + regs.eax.w[0] = 0x0010; + regs.es = SEG(lm_hostname); + /* regs.ebx.w[0] = OFFS(lm_hostname); */ + + __intcall(0x22, ®s, ®s); + + lfree(lm_hostname); + + if (regs.eflags.l & EFLAGS_CF) + return 0; + + return regs.eax.l; +} |