xref: /freebsd/usr.bin/ar/read.c (revision ebacd8013fe5f7fdf9f6a5b286f6680dd2891036)
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 <assert.h>
38 #include <errno.h>
39 #include <libgen.h>
40 #include <stdio.h>
41 #include <stdlib.h>
42 #include <string.h>
43 
44 #include "ar.h"
45 
46 /*
47  * Handle read modes: 'x', 't' and 'p'.
48  */
49 int
50 ar_read_archive(struct bsdar *bsdar, int mode, FILE *out)
51 {
52 	struct archive		 *a;
53 	struct archive_entry	 *entry;
54 	struct stat		  sb;
55 	struct tm		 *tp;
56 	const char		 *bname;
57 	const char		 *name;
58 	mode_t			  md;
59 	size_t			  size;
60 	time_t			  mtime;
61 	uid_t			  uid;
62 	gid_t			  gid;
63 	char			**av;
64 	char			  buf[25];
65 	char			  find;
66 	int			  exitcode, flags, r, i;
67 
68 	assert(mode == 'p' || mode == 't' || mode == 'x');
69 
70 	if ((a = archive_read_new()) == NULL)
71 		bsdar_errc(bsdar, 0, "archive_read_new failed");
72 	archive_read_support_format_ar(a);
73 	AC(archive_read_open_filename(a, bsdar->filename, DEF_BLKSZ));
74 
75 	exitcode = EXIT_SUCCESS;
76 
77 	for (;;) {
78 		r = archive_read_next_header(a, &entry);
79 		if (r == ARCHIVE_WARN || r == ARCHIVE_RETRY ||
80 		    r == ARCHIVE_FATAL)
81 			bsdar_warnc(bsdar, archive_errno(a), "%s",
82 			    archive_error_string(a));
83 		if (r == ARCHIVE_EOF || r == ARCHIVE_FATAL)
84 			break;
85 		if (r == ARCHIVE_RETRY) {
86 			bsdar_warnc(bsdar, 0, "Retrying...");
87 			continue;
88 		}
89 
90 		if ((name = archive_entry_pathname(entry)) == NULL)
91 			break;
92 
93 		/* Skip pseudo members. */
94 		if (strcmp(name, "/") == 0 || strcmp(name, "//") == 0 ||
95 		    strcmp(name, "/SYM64/") == 0)
96 			continue;
97 
98 		if (bsdar->argc > 0) {
99 			find = 0;
100 			for(i = 0; i < bsdar->argc; i++) {
101 				av = &bsdar->argv[i];
102 				if (*av == NULL)
103 					continue;
104 				if ((bname = basename(*av)) == NULL)
105 					bsdar_errc(bsdar, errno,
106 					    "basename failed");
107 				if (strcmp(bname, name) != 0)
108 					continue;
109 
110 				*av = NULL;
111 				find = 1;
112 				break;
113 			}
114 			if (!find)
115 				continue;
116 		}
117 
118 		if (mode == 't') {
119 			if (bsdar->options & AR_V) {
120 				md = archive_entry_mode(entry);
121 				uid = archive_entry_uid(entry);
122 				gid = archive_entry_gid(entry);
123 				size = archive_entry_size(entry);
124 				mtime = archive_entry_mtime(entry);
125 				(void)strmode(md, buf);
126 				(void)fprintf(out, "%s %6d/%-6d %8ju ",
127 				    buf + 1, uid, gid, (uintmax_t)size);
128 				tp = localtime(&mtime);
129 				(void)strftime(buf, sizeof(buf),
130 				    "%b %e %H:%M %Y", tp);
131 				(void)fprintf(out, "%s %s", buf, name);
132 			} else
133 				(void)fprintf(out, "%s", name);
134 			r = archive_read_data_skip(a);
135 			if (r == ARCHIVE_WARN || r == ARCHIVE_RETRY ||
136 			    r == ARCHIVE_FATAL) {
137 				(void)fprintf(out, "\n");
138 				bsdar_warnc(bsdar, archive_errno(a), "%s",
139 				    archive_error_string(a));
140 			}
141 
142 			if (r == ARCHIVE_FATAL)
143 				break;
144 
145 			(void)fprintf(out, "\n");
146 		} else {
147 			/* mode == 'x' || mode = 'p' */
148 			if (mode == 'p') {
149 				if (bsdar->options & AR_V) {
150 					(void)fprintf(out, "\n<%s>\n\n",
151 					    name);
152 					fflush(out);
153 				}
154 				r = archive_read_data_into_fd(a, 1);
155 			} else {
156 				/* mode == 'x' */
157 				if (stat(name, &sb) != 0) {
158 					if (errno != ENOENT) {
159 						bsdar_warnc(bsdar, 0,
160 						    "stat %s failed",
161 						    bsdar->filename);
162 						continue;
163 					}
164 				} else {
165 					/* stat success, file exist */
166 					if (bsdar->options & AR_CC)
167 						continue;
168 					if (bsdar->options & AR_U &&
169 					    archive_entry_mtime(entry) <=
170 					    sb.st_mtime)
171 						continue;
172 				}
173 
174 				if (bsdar->options & AR_V)
175 					(void)fprintf(out, "x - %s\n", name);
176 				/* Disallow absolute paths. */
177 				if (name[0] == '/') {
178 					bsdar_warnc(bsdar, 0,
179 					    "Absolute path '%s'", name);
180 					continue;
181 				}
182 				/* Basic path security flags. */
183 				flags = ARCHIVE_EXTRACT_SECURE_SYMLINKS |
184 				    ARCHIVE_EXTRACT_SECURE_NODOTDOT;
185 				if (bsdar->options & AR_O)
186 					flags |= ARCHIVE_EXTRACT_TIME;
187 
188 				r = archive_read_extract(a, entry, flags);
189 			}
190 
191 			if (r) {
192 				bsdar_warnc(bsdar, archive_errno(a), "%s",
193 				    archive_error_string(a));
194 				exitcode = EXIT_FAILURE;
195 			}
196 		}
197 	}
198 
199 	if (r == ARCHIVE_FATAL)
200 		exitcode = EXIT_FAILURE;
201 
202 	AC(archive_read_close(a));
203 	AC(archive_read_free(a));
204 
205 	return (exitcode);
206 }
207