Return to isexec.c CVS log

Up to [local] / src / usr.bin / rdist

rcsid[] and sccsid[] and copyright[] are essentially unmaintained (and
unmaintainable).  these days, people use source.  these id's do not provide
any benefit, and do hurt the small install media
(the 33,000 line diff is essentially mechanical)
ok with the idea millert, ok dms

/*	$OpenBSD: isexec.c,v 1.8 2009/10/27 23:59:42 deraadt Exp $	*/

/*
 * Copyright (c) 1983 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include "defs.h"

static int _isexec(int);

#if	EXE_TYPE == EXE_AOUT
/*
 * BSD style A.OUT
 */
#include <a.out.h>

static int
_isexec(int fd)
{
	struct exec ehdr;

	if ((read(fd, &ehdr, sizeof(ehdr)) == sizeof(ehdr)) && 
	    !N_BADMAG(ehdr))
		return(TRUE);
	else
		return(FALSE);
}
#endif /* EXE_AOUT */


#if	EXE_TYPE == EXE_ELF_AND_COFF || EXE_TYPE == EXE_ELF
/*
 * Elf
 */
#include <elf_abi.h>
#define ISELF(h)	(h.e_type == ET_EXEC)
#endif	/* EXE_ELF_AND_COFF || EXE_ELF */

#if 	EXE_TYPE == EXE_ELF_AND_COFF || EXE_TYPE == EXE_COFF

/*
 * COFF
 */
#if defined(FILEHDR_H)
#include FILEHDR_H
#endif	/* FILEHDR_H */

#if !defined(ISCOFF)

/*
 * Stupid AIX
 */
#if defined(U802WRMAGIC) && defined(U802ROMAGIC) && defined(U802TOCMAGIC)
#define ISCOFF(x) (((x)==U802WRMAGIC) || ((x)==U802TOCMAGIC) || \
		   ((x)==U802TOCMAGIC))
#endif	/* U802... */
/*
 * Stupid Umax4.3
 */
#if 	defined(NS32GMAGIC) || defined(NS32SMAGIC)
#define ISCOFF(x) (((x)==NS32GMAGIC) || ((x)==NS32SMAGIC))
#endif 	/* NS32 ... */

#endif	/* ISCOFF */

#endif /* EXE_TYPE == EXE_ELF_AND_COFF || EXE_TYPE == EXE_COFF */

#if	EXE_TYPE == EXE_ELF_AND_COFF
/*
 * ELF and COFF
 */
typedef union {
    struct filehdr 	coffhdr;
    Elf32_Ehdr 		elfhdr;
} hdr_t;
#endif	/* EXE_TYPE == EXE_ELF_AND_COFF */

#if	EXE_TYPE == EXE_ELF
/*
 * Elf
 */
typedef Elf32_Ehdr 	hdr_t;
#endif	/* EXE_TYPE == EXE_ELF */

#if	EXE_TYPE == EXE_COFF
/*
 * COFF
 */

#if	defined(FILEHDR_H)
#include FILEHDR_H
#endif	/* FILEHDR_H */

typedef struct filehdr 	hdr_t;
#endif	/* EXE_TYPE == EXE_COFF */

#if	EXE_TYPE == EXE_ELF_AND_COFF || EXE_TYPE == EXE_ELF || EXE_TYPE == EXE_COFF
/*
 * System V style COFF and System V R4 style ELF
 */
static int
_isexec(int fd)
{
	hdr_t hdr;

	if (read(fd, &hdr, sizeof(hdr)) == sizeof(hdr)) {
#if EXE_TYPE == EXE_ELF_AND_COFF
	    if (ISELF(hdr.elfhdr) || ISCOFF(hdr.coffhdr.f_magic))
		return(TRUE);
#endif
#if EXE_TYPE == EXE_ELF
	    if (ISELF(hdr))
		return(TRUE);
#endif
#if EXE_TYPE == EXE_COFF
	    if (ISCOFF(hdr.f_magic))
		return(TRUE);
#endif
	}

	return(FALSE);
}
#endif /* EXE_ELF_AND_COFF */


#if	EXE_TYPE == EXE_MACHO
/*
 * Mach-O format
 */

#if	defined(NEXTSTEP) && NEXTSTEP >= 3
#	include <mach-o/loader.h>
#else
#	include <sys/loader.h>
#endif	/* NEXTSTEP */

#ifndef MH_CIGAM
#define MH_CIGAM  	0xcefaedfe
#endif
#ifndef FAT_MAGIC
#define FAT_MAGIC 	0xcafebabe
#endif
#ifndef FAT_CIGAM
#define FAT_CIGAM 	0xbebafeca
#endif

static int
_isexec(int fd)
{
	struct mach_header ehdr;

	if ((read(fd, &ehdr, sizeof(ehdr)) == sizeof(ehdr)) && 
	    (ehdr.magic == MH_MAGIC || ehdr.magic == MH_CIGAM ||
	     ehdr.magic == FAT_MAGIC || ehdr.magic == FAT_CIGAM))
		return(TRUE);
	else
		return(FALSE);
}
#endif /* EXE_COFF */


#if	EXE_TYPE == EXE_HPEXEC
/*
 * HP 9000 executable format
 */

#ifdef hp9000s300

#include <a.out.h>
#define header exec
#define ISEXEC(a) ((a.file_type)==EXEC_MAGIC || (a.file_type)==SHARE_MAGIC || \
		   (a.file_type)==DEMAND_MAGIC)

#else	/* ! hp9000s300 */

#define ISEXEC(a) ((a)==EXEC_MAGIC || (a)==SHARE_MAGIC || (a)==DEMAND_MAGIC)
#include <filehdr.h>

#endif	/* hp9000s300 */

static int
_isexec(int fd)
{
	struct header ehdr;

	if ((read(fd, &ehdr, sizeof(ehdr)) == sizeof(ehdr)) &&
	    ISEXEC(ehdr.a_magic))
		return(TRUE);
	else
		return(FALSE);
}
#endif	/* EXE_HPEXEC */


#if	!defined(EXE_TYPE)
/*
 * Fake _isexec() call for unknown executable formats.
 */
static int
_isexec(int fd)
{
	return(FALSE);
}
#endif	/* !defined(EXE_TYPE) */

/*
 * Determine whether 'file' is an executable or not.
 */
int
isexec(char *file, struct stat *statp)
{
	int fd, r;

	/*
	 * Must be a regular file that has some executable mode bit on
	 */
	if (!S_ISREG(statp->st_mode) ||
	    !(statp->st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)))
		return(FALSE);

	if ((fd = open(file, O_RDONLY, 0)) < 0)
		return(FALSE);
	r = _isexec(fd);
	(void) close(fd);

	return(r);
}