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Annotation of src/usr.bin/rdist/isexec.c, Revision 1.9

1.9     ! guenther    1: /*     $OpenBSD: isexec.c,v 1.8 2009/10/27 23:59:42 deraadt Exp $      */
1.3       deraadt     2:
1.1       dm          3: /*
                      4:  * Copyright (c) 1983 Regents of the University of California.
                      5:  * All rights reserved.
                      6:  *
                      7:  * Redistribution and use in source and binary forms, with or without
                      8:  * modification, are permitted provided that the following conditions
                      9:  * are met:
                     10:  * 1. Redistributions of source code must retain the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer.
                     12:  * 2. Redistributions in binary form must reproduce the above copyright
                     13:  *    notice, this list of conditions and the following disclaimer in the
                     14:  *    documentation and/or other materials provided with the distribution.
1.7       millert    15:  * 3. Neither the name of the University nor the names of its contributors
1.1       dm         16:  *    may be used to endorse or promote products derived from this software
                     17:  *    without specific prior written permission.
                     18:  *
                     19:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     20:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     21:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     22:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     23:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     24:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     25:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     26:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     27:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     28:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     29:  * SUCH DAMAGE.
                     30:  */
1.6       millert    31:
                     32: #include "defs.h"
1.1       dm         33:
1.5       millert    34: #include <elf_abi.h>
1.1       dm         35:
                     36: /*
1.9     ! guenther   37:  * Determine whether 'file' is a binary executable or not.
1.1       dm         38:  */
1.6       millert    39: int
                     40: isexec(char *file, struct stat *statp)
1.1       dm         41: {
1.9     ! guenther   42:        Elf32_Ehdr hdr;
1.1       dm         43:        int fd, r;
                     44:
                     45:        /*
                     46:         * Must be a regular file that has some executable mode bit on
                     47:         */
                     48:        if (!S_ISREG(statp->st_mode) ||
                     49:            !(statp->st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)))
                     50:                return(FALSE);
                     51:
                     52:        if ((fd = open(file, O_RDONLY, 0)) < 0)
                     53:                return(FALSE);
                     54:
1.9     ! guenther   55:        r = read(fd, &hdr, sizeof(hdr)) == sizeof(hdr) &&
        !            56:            IS_ELF(hdr) && hdr.e_type == ET_EXEC;
        !            57:        close(fd);
        !            58:
        !            59:        return (r);
1.1       dm         60: }