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      1 /*	$NetBSD: dumptar.c,v 1.3 2016/05/30 17:34:35 dholland Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2004 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Christos Zoulas.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <stdio.h>
     33 #include <string.h>
     34 #include <stdlib.h>
     35 #include <unistd.h>
     36 #include <fcntl.h>
     37 #include <err.h>
     38 #include <assert.h>
     39 #include <sys/stat.h>
     40 #include <sys/mman.h>
     41 
     42 #include "tar.h"
     43 
     44 #define ussum(a) 1
     45 
     46 /*
     47  * Ensure null termination.
     48  */
     49 static char *
     50 buf(const char *p, size_t s)
     51 {
     52 	static char buf[1024];
     53 
     54 	assert(s < sizeof(buf));
     55 	memcpy(buf, p, s);
     56 	buf[s] = '\0';
     57 	return buf;
     58 }
     59 
     60 static int
     61 intarg(const char *p, size_t s)
     62 {
     63 	char *ep, *b = buf(p, s);
     64 	int r = (int)strtol(b, &ep, 8);
     65 	return r;
     66 }
     67 
     68 static int
     69 usdump(void *p)
     70 {
     71 	HD_USTAR *t = p;
     72 	int size = intarg(t->size, sizeof(t->size));
     73 	size = ((size + 511) / 512) * 512 + 512;
     74 
     75 	(void)fprintf(stdout, "*****\n");
     76 #define PR(a) \
     77 	(void)fprintf(stdout, #a "=%s\n", buf(t->a, sizeof(t->a)));
     78 #define IPR(a) \
     79 	(void)fprintf(stdout, #a "=%d\n", intarg(t->a, sizeof(t->a)));
     80 #define OPR(a) \
     81 	(void)fprintf(stdout, #a "=%o\n", intarg(t->a, sizeof(t->a)));
     82 	PR(name);
     83 	OPR(mode);
     84 	IPR(uid);
     85 	IPR(gid);
     86 	IPR(size);
     87 	OPR(mtime);
     88 	OPR(chksum);
     89 	(void)fprintf(stdout, "typeflag=%c\n", t->typeflag);
     90 	PR(linkname);
     91 	PR(magic);
     92 	PR(version);
     93 	PR(uname);
     94 	PR(gname);
     95 	OPR(devmajor);
     96 	OPR(devminor);
     97 	PR(prefix);
     98 	return size;
     99 }
    100 
    101 int
    102 main(int argc, char *argv[])
    103 {
    104 	int fd;
    105 	struct stat st;
    106 	char *p, *ep;
    107 
    108 	if (argc != 2) {
    109 		(void)fprintf(stderr, "Usage: %s <filename>\n", getprogname());
    110 		return 1;
    111 	}
    112 
    113 	if ((fd = open(argv[1], O_RDONLY)) == -1)
    114 		err(1, "Cannot open `%s'", argv[1]);
    115 
    116 	if (fstat(fd, &st) == -1)
    117 		err(1, "Cannot fstat `%s'", argv[1]);
    118 
    119 	if ((p = mmap(NULL, (size_t)st.st_size, PROT_READ,
    120 	    MAP_FILE|MAP_PRIVATE, fd, (off_t)0)) == MAP_FAILED)
    121 		err(1, "Cannot mmap `%s'", argv[1]);
    122 	(void)close(fd);
    123 
    124 	ep = (char *)p + (size_t)st.st_size;
    125 
    126 	for (; p < ep + sizeof(HD_USTAR);) {
    127 		if (ussum(p))
    128 			p += usdump(p);
    129 	}
    130 	return 0;
    131 }
    132