elf_rand.c revision 260684
1260684Skaiw/*- 2260684Skaiw * Copyright (c) 2006,2008 Joseph Koshy 3260684Skaiw * All rights reserved. 4260684Skaiw * 5260684Skaiw * Redistribution and use in source and binary forms, with or without 6260684Skaiw * modification, are permitted provided that the following conditions 7260684Skaiw * are met: 8260684Skaiw * 1. Redistributions of source code must retain the above copyright 9260684Skaiw * notice, this list of conditions and the following disclaimer. 10260684Skaiw * 2. Redistributions in binary form must reproduce the above copyright 11260684Skaiw * notice, this list of conditions and the following disclaimer in the 12260684Skaiw * documentation and/or other materials provided with the distribution. 13260684Skaiw * 14260684Skaiw * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15260684Skaiw * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16260684Skaiw * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17260684Skaiw * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18260684Skaiw * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19260684Skaiw * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20260684Skaiw * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21260684Skaiw * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22260684Skaiw * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23260684Skaiw * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24260684Skaiw * SUCH DAMAGE. 25260684Skaiw */ 26260684Skaiw 27260684Skaiw#include <sys/cdefs.h> 28260684Skaiw 29260684Skaiw#include <ar.h> 30260684Skaiw#include <libelf.h> 31260684Skaiw 32260684Skaiw#include "_libelf.h" 33260684Skaiw 34260684SkaiwELFTC_VCSID("$Id: elf_rand.c 2225 2011-11-26 18:55:54Z jkoshy $"); 35260684Skaiw 36260684Skaiwoff_t 37260684Skaiwelf_rand(Elf *ar, off_t offset) 38260684Skaiw{ 39260684Skaiw struct ar_hdr *arh; 40260684Skaiw 41260684Skaiw if (ar == NULL || ar->e_kind != ELF_K_AR || 42260684Skaiw (offset & 1) || offset < SARMAG || 43260684Skaiw offset + sizeof(struct ar_hdr) >= ar->e_rawsize) { 44260684Skaiw LIBELF_SET_ERROR(ARGUMENT, 0); 45260684Skaiw return 0; 46260684Skaiw } 47260684Skaiw 48260684Skaiw arh = (struct ar_hdr *) (ar->e_rawfile + offset); 49260684Skaiw 50260684Skaiw /* a too simple sanity check */ 51260684Skaiw if (arh->ar_fmag[0] != '`' || arh->ar_fmag[1] != '\n') { 52260684Skaiw LIBELF_SET_ERROR(ARCHIVE, 0); 53260684Skaiw return 0; 54260684Skaiw } 55260684Skaiw 56260684Skaiw ar->e_u.e_ar.e_next = offset; 57260684Skaiw 58260684Skaiw return (offset); 59260684Skaiw} 60