64 lines
2.2 KiB
C
64 lines
2.2 KiB
C
/* $OpenBSD: isexec.c,v 1.13 2021/10/24 21:24:17 deraadt Exp $ */
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/*
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* Copyright (c) 1983 Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/types.h>
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#include <elf.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include "client.h"
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/*
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* Determine whether 'file' is a binary executable or not.
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*/
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int
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isexec(char *file, struct stat *statp)
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{
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Elf32_Ehdr hdr;
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int fd, r;
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/*
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* Must be a regular file that has some executable mode bit on
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*/
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if (!S_ISREG(statp->st_mode) ||
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!(statp->st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)))
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return(FALSE);
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if ((fd = open(file, O_RDONLY)) == -1)
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return(FALSE);
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r = read(fd, &hdr, sizeof(hdr)) == sizeof(hdr) &&
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IS_ELF(hdr) && hdr.e_type == ET_EXEC;
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close(fd);
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return (r);
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}
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