90 lines
2.4 KiB
C
90 lines
2.4 KiB
C
/* ----------------------------------------------------------------------- *
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*
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* Copyright 2007-2008 H. Peter Anvin - All Rights Reserved
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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_get_cached.c
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*
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* PXE call "get cached info"
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*/
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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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int pxe_get_cached_info(int level, void **buf, size_t * len)
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{
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const int max_dhcp_packet = 2048;
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t_PXENV_GET_CACHED_INFO *gci;
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void *bbuf, *nbuf;
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int err;
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gci = lmalloc(sizeof *gci + max_dhcp_packet);
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if (!gci)
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return -1;
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bbuf = &gci[1];
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gci->Status = PXENV_STATUS_FAILURE;
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gci->PacketType = level;
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gci->BufferSize = gci->BufferLimit = max_dhcp_packet;
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gci->Buffer.seg = SEG(bbuf);
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gci->Buffer.offs = OFFS(bbuf);
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err = pxe_call(PXENV_GET_CACHED_INFO, gci);
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if (err) {
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err = -1;
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goto exit;
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}
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if (gci->Status) {
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err = gci->Status;
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goto exit;
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}
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nbuf = malloc(gci->BufferSize);
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if (!nbuf) {
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err = -1;
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goto exit;
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}
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memcpy(nbuf, bbuf, gci->BufferSize);
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*buf = nbuf;
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*len = gci->BufferSize;
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err = 0;
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exit:
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lfree(gci);
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return err;
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}
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