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 *
buf(const char * p,size_t s)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
intarg(const char * p,size_t s)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
usdump(void * p)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
main(int argc,char * argv[])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