xref: /freebsd/usr.bin/ar/read.c (revision 62cfcf62f627e5093fb37026a6d8c98e4d2ef04c)
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  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27  * SUCH DAMAGE.
28  */
29 
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
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 
45 static void read_archive(struct bsdar *bsdar, char mode);
46 
47 void
48 ar_mode_p(struct bsdar *bsdar)
49 {
50 
51 	read_archive(bsdar, 'p');
52 }
53 
54 void
55 ar_mode_t(struct bsdar *bsdar)
56 {
57 
58 	read_archive(bsdar, 't');
59 }
60 
61 void
62 ar_mode_x(struct bsdar *bsdar)
63 {
64 
65 	read_archive(bsdar, 'x');
66 }
67 
68 /*
69  * Handle read modes: 'x', 't' and 'p'.
70  */
71 static void
72 read_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 		    strcmp(name, "/SYM64/") == 0)
114 			continue;
115 
116 		if (bsdar->argc > 0) {
117 			find = 0;
118 			for(i = 0; i < bsdar->argc; i++) {
119 				av = &bsdar->argv[i];
120 				if (*av == NULL)
121 					continue;
122 				if ((bname = basename(*av)) == NULL)
123 					bsdar_errc(bsdar, EX_SOFTWARE, errno,
124 					    "basename failed");
125 				if (strcmp(bname, name) != 0)
126 					continue;
127 
128 				*av = NULL;
129 				find = 1;
130 				break;
131 			}
132 			if (!find)
133 				continue;
134 		}
135 
136 		if (mode == 't') {
137 			if (bsdar->options & AR_V) {
138 				md = archive_entry_mode(entry);
139 				uid = archive_entry_uid(entry);
140 				gid = archive_entry_gid(entry);
141 				size = archive_entry_size(entry);
142 				mtime = archive_entry_mtime(entry);
143 				(void)strmode(md, buf);
144 				(void)fprintf(stdout, "%s %6d/%-6d %8ju ",
145 				    buf + 1, uid, gid, (uintmax_t)size);
146 				tp = localtime(&mtime);
147 				(void)strftime(buf, sizeof(buf),
148 				    "%b %e %H:%M %Y", tp);
149 				(void)fprintf(stdout, "%s %s", buf, name);
150 			} else
151 				(void)fprintf(stdout, "%s", name);
152 			r = archive_read_data_skip(a);
153 			if (r == ARCHIVE_WARN || r == ARCHIVE_RETRY ||
154 			    r == ARCHIVE_FATAL) {
155 				(void)fprintf(stdout, "\n");
156 				bsdar_warnc(bsdar, archive_errno(a), "%s",
157 				    archive_error_string(a));
158 			}
159 
160 			if (r == ARCHIVE_FATAL)
161 				break;
162 
163 			(void)fprintf(stdout, "\n");
164 		} else {
165 			/* mode == 'x' || mode = 'p' */
166 			if (mode == 'p') {
167 				if (bsdar->options & AR_V) {
168 					(void)fprintf(stdout, "\n<%s>\n\n",
169 					    name);
170 					fflush(stdout);
171 				}
172 				r = archive_read_data_into_fd(a, 1);
173 			} else {
174 				/* mode == 'x' */
175 				if (stat(name, &sb) != 0) {
176 					if (errno != ENOENT) {
177 						bsdar_warnc(bsdar, 0,
178 						    "stat %s failed",
179 						    bsdar->filename);
180 						continue;
181 					}
182 				} else {
183 					/* stat success, file exist */
184 					if (bsdar->options & AR_CC)
185 						continue;
186 					if (bsdar->options & AR_U &&
187 					    archive_entry_mtime(entry) <=
188 					    sb.st_mtime)
189 						continue;
190 				}
191 
192 				if (bsdar->options & AR_V)
193 					(void)fprintf(stdout, "x - %s\n", name);
194 				/* Disallow absolute paths. */
195 				if (name[0] == '/') {
196 					bsdar_warnc(bsdar, 0,
197 					    "Absolute path '%s'", name);
198 					continue;
199 				}
200 				/* Basic path security flags. */
201 				flags = ARCHIVE_EXTRACT_SECURE_SYMLINKS |
202 				    ARCHIVE_EXTRACT_SECURE_NODOTDOT;
203 				if (bsdar->options & AR_O)
204 					flags |= ARCHIVE_EXTRACT_TIME;
205 
206 				r = archive_read_extract(a, entry, flags);
207 			}
208 
209 			if (r)
210 				bsdar_warnc(bsdar, archive_errno(a), "%s",
211 				    archive_error_string(a));
212 		}
213 	}
214 	AC(archive_read_close(a));
215 	AC(archive_read_free(a));
216 }
217