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