read.c revision 346901
1/*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2007 Kai Wang 5 * Copyright (c) 2007 Tim Kientzle 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer 13 * in this position and unchanged. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30#include <sys/cdefs.h> 31__FBSDID("$FreeBSD: stable/11/usr.bin/ar/read.c 346901 2019-04-29 18:28:34Z emaste $"); 32 33#include <sys/queue.h> 34#include <sys/stat.h> 35#include <archive.h> 36#include <archive_entry.h> 37#include <errno.h> 38#include <libgen.h> 39#include <stdio.h> 40#include <string.h> 41#include <sysexits.h> 42 43#include "ar.h" 44 45static void read_archive(struct bsdar *bsdar, char mode); 46 47void 48ar_mode_p(struct bsdar *bsdar) 49{ 50 51 read_archive(bsdar, 'p'); 52} 53 54void 55ar_mode_t(struct bsdar *bsdar) 56{ 57 58 read_archive(bsdar, 't'); 59} 60 61void 62ar_mode_x(struct bsdar *bsdar) 63{ 64 65 read_archive(bsdar, 'x'); 66} 67 68/* 69 * Handle read modes: 'x', 't' and 'p'. 70 */ 71static void 72read_archive(struct bsdar *bsdar, char mode) 73{ 74 struct archive *a; 75 struct archive_entry *entry; 76 struct stat sb; 77 struct tm *tp; 78 const char *bname; 79 const char *name; 80 mode_t md; 81 size_t size; 82 time_t mtime; 83 uid_t uid; 84 gid_t gid; 85 char **av; 86 char buf[25]; 87 char find; 88 int flags, r, i; 89 90 if ((a = archive_read_new()) == NULL) 91 bsdar_errc(bsdar, EX_SOFTWARE, 0, "archive_read_new failed"); 92 archive_read_support_format_ar(a); 93 AC(archive_read_open_filename(a, bsdar->filename, DEF_BLKSZ)); 94 95 for (;;) { 96 r = archive_read_next_header(a, &entry); 97 if (r == ARCHIVE_WARN || r == ARCHIVE_RETRY || 98 r == ARCHIVE_FATAL) 99 bsdar_warnc(bsdar, archive_errno(a), "%s", 100 archive_error_string(a)); 101 if (r == ARCHIVE_EOF || r == ARCHIVE_FATAL) 102 break; 103 if (r == ARCHIVE_RETRY) { 104 bsdar_warnc(bsdar, 0, "Retrying..."); 105 continue; 106 } 107 108 if ((name = archive_entry_pathname(entry)) == NULL) 109 break; 110 111 /* Skip pseudo members. */ 112 if (strcmp(name, "/") == 0 || strcmp(name, "//") == 0) 113 continue; 114 115 if (bsdar->argc > 0) { 116 find = 0; 117 for(i = 0; i < bsdar->argc; i++) { 118 av = &bsdar->argv[i]; 119 if (*av == NULL) 120 continue; 121 if ((bname = basename(*av)) == NULL) 122 bsdar_errc(bsdar, EX_SOFTWARE, errno, 123 "basename failed"); 124 if (strcmp(bname, name) != 0) 125 continue; 126 127 *av = NULL; 128 find = 1; 129 break; 130 } 131 if (!find) 132 continue; 133 } 134 135 if (mode == 't') { 136 if (bsdar->options & AR_V) { 137 md = archive_entry_mode(entry); 138 uid = archive_entry_uid(entry); 139 gid = archive_entry_gid(entry); 140 size = archive_entry_size(entry); 141 mtime = archive_entry_mtime(entry); 142 (void)strmode(md, buf); 143 (void)fprintf(stdout, "%s %6d/%-6d %8ju ", 144 buf + 1, uid, gid, (uintmax_t)size); 145 tp = localtime(&mtime); 146 (void)strftime(buf, sizeof(buf), 147 "%b %e %H:%M %Y", tp); 148 (void)fprintf(stdout, "%s %s", buf, name); 149 } else 150 (void)fprintf(stdout, "%s", name); 151 r = archive_read_data_skip(a); 152 if (r == ARCHIVE_WARN || r == ARCHIVE_RETRY || 153 r == ARCHIVE_FATAL) { 154 (void)fprintf(stdout, "\n"); 155 bsdar_warnc(bsdar, archive_errno(a), "%s", 156 archive_error_string(a)); 157 } 158 159 if (r == ARCHIVE_FATAL) 160 break; 161 162 (void)fprintf(stdout, "\n"); 163 } else { 164 /* mode == 'x' || mode = 'p' */ 165 if (mode == 'p') { 166 if (bsdar->options & AR_V) { 167 (void)fprintf(stdout, "\n<%s>\n\n", 168 name); 169 fflush(stdout); 170 } 171 r = archive_read_data_into_fd(a, 1); 172 } else { 173 /* mode == 'x' */ 174 if (stat(name, &sb) != 0) { 175 if (errno != ENOENT) { 176 bsdar_warnc(bsdar, 0, 177 "stat %s failed", 178 bsdar->filename); 179 continue; 180 } 181 } else { 182 /* stat success, file exist */ 183 if (bsdar->options & AR_CC) 184 continue; 185 if (bsdar->options & AR_U && 186 archive_entry_mtime(entry) <= 187 sb.st_mtime) 188 continue; 189 } 190 191 if (bsdar->options & AR_V) 192 (void)fprintf(stdout, "x - %s\n", name); 193 /* Disallow absolute paths. */ 194 if (name[0] == '/') { 195 bsdar_warnc(bsdar, 0, 196 "Absolute path '%s'", name); 197 continue; 198 } 199 /* Basic path security flags. */ 200 flags = ARCHIVE_EXTRACT_SECURE_SYMLINKS | 201 ARCHIVE_EXTRACT_SECURE_NODOTDOT; 202 if (bsdar->options & AR_O) 203 flags |= ARCHIVE_EXTRACT_TIME; 204 205 r = archive_read_extract(a, entry, flags); 206 } 207 208 if (r) 209 bsdar_warnc(bsdar, archive_errno(a), "%s", 210 archive_error_string(a)); 211 } 212 } 213 AC(archive_read_close(a)); 214 AC(archive_read_free(a)); 215} 216