1/* ----------------------------------------------------------------------- * 2 * 3 * Copyright 2007-2008 H. Peter Anvin - All Rights Reserved 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_get_cached.c 30 * 31 * PXE call "get cached info" 32 */ 33 34#include <stdlib.h> 35#include <stdint.h> 36#include <string.h> 37#include <com32.h> 38 39#include <syslinux/pxe.h> 40 41/* Returns the status code from PXE (0 on success), 42 or -1 on invocation failure */ 43int pxe_get_cached_info(int level, void **buf, size_t * len) 44{ 45 const int max_dhcp_packet = 2048; 46 t_PXENV_GET_CACHED_INFO *gci; 47 void *bbuf, *nbuf; 48 int err; 49 50 gci = lmalloc(sizeof *gci + max_dhcp_packet); 51 if (!gci) 52 return -1; 53 54 bbuf = &gci[1]; 55 56 gci->Status = PXENV_STATUS_FAILURE; 57 gci->PacketType = level; 58 gci->BufferSize = gci->BufferLimit = max_dhcp_packet; 59 gci->Buffer.seg = SEG(bbuf); 60 gci->Buffer.offs = OFFS(bbuf); 61 62 err = pxe_call(PXENV_GET_CACHED_INFO, gci); 63 64 if (err) { 65 err = -1; 66 goto exit; 67 } 68 69 if (gci->Status) { 70 err = gci->Status; 71 goto exit; 72 } 73 74 nbuf = malloc(gci->BufferSize); 75 if (!nbuf) { 76 err = -1; 77 goto exit; 78 } 79 80 memcpy(nbuf, bbuf, gci->BufferSize); 81 82 *buf = nbuf; 83 *len = gci->BufferSize; 84 err = 0; 85 86exit: 87 lfree(gci); 88 return err; 89} 90