1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
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 #include <sys/queue.h>
32 #include <sys/stat.h>
33 #include <archive.h>
34 #include <archive_entry.h>
35 #include <assert.h>
36 #include <errno.h>
37 #include <libgen.h>
38 #include <stdio.h>
39 #include <stdlib.h>
40 #include <string.h>
41
42 #include "ar.h"
43
44 /*
45 * Handle read modes: 'x', 't' and 'p'.
46 */
47 int
ar_read_archive(struct bsdar * bsdar,int mode,FILE * out)48 ar_read_archive(struct bsdar *bsdar, int mode, FILE *out)
49 {
50 struct archive *a;
51 struct archive_entry *entry;
52 struct stat sb;
53 struct tm *tp;
54 const char *bname;
55 const char *name;
56 mode_t md;
57 size_t size;
58 time_t mtime;
59 uid_t uid;
60 gid_t gid;
61 char **av;
62 char buf[25];
63 char find;
64 int exitcode, flags, r, i;
65
66 assert(mode == 'p' || mode == 't' || mode == 'x');
67
68 if ((a = archive_read_new()) == NULL)
69 bsdar_errc(bsdar, 0, "archive_read_new failed");
70 archive_read_support_format_ar(a);
71 AC(archive_read_open_filename(a, bsdar->filename, DEF_BLKSZ));
72
73 exitcode = EXIT_SUCCESS;
74
75 for (;;) {
76 r = archive_read_next_header(a, &entry);
77 if (r == ARCHIVE_WARN || r == ARCHIVE_RETRY ||
78 r == ARCHIVE_FATAL)
79 bsdar_warnc(bsdar, archive_errno(a), "%s",
80 archive_error_string(a));
81 if (r == ARCHIVE_EOF || r == ARCHIVE_FATAL)
82 break;
83 if (r == ARCHIVE_RETRY) {
84 bsdar_warnc(bsdar, 0, "Retrying...");
85 continue;
86 }
87
88 if ((name = archive_entry_pathname(entry)) == NULL)
89 break;
90
91 /* Skip pseudo members. */
92 if (strcmp(name, "/") == 0 || strcmp(name, "//") == 0 ||
93 strcmp(name, "/SYM64/") == 0)
94 continue;
95
96 if (bsdar->argc > 0) {
97 find = 0;
98 for(i = 0; i < bsdar->argc; i++) {
99 av = &bsdar->argv[i];
100 if (*av == NULL)
101 continue;
102 if ((bname = basename(*av)) == NULL)
103 bsdar_errc(bsdar, errno,
104 "basename failed");
105 if (strcmp(bname, name) != 0)
106 continue;
107
108 *av = NULL;
109 find = 1;
110 break;
111 }
112 if (!find)
113 continue;
114 }
115
116 if (mode == 't') {
117 if (bsdar->options & AR_V) {
118 md = archive_entry_mode(entry);
119 uid = archive_entry_uid(entry);
120 gid = archive_entry_gid(entry);
121 size = archive_entry_size(entry);
122 mtime = archive_entry_mtime(entry);
123 (void)strmode(md, buf);
124 (void)fprintf(out, "%s %6d/%-6d %8ju ",
125 buf + 1, uid, gid, (uintmax_t)size);
126 tp = localtime(&mtime);
127 (void)strftime(buf, sizeof(buf),
128 "%b %e %H:%M %Y", tp);
129 (void)fprintf(out, "%s %s", buf, name);
130 } else
131 (void)fprintf(out, "%s", name);
132 r = archive_read_data_skip(a);
133 if (r == ARCHIVE_WARN || r == ARCHIVE_RETRY ||
134 r == ARCHIVE_FATAL) {
135 (void)fprintf(out, "\n");
136 bsdar_warnc(bsdar, archive_errno(a), "%s",
137 archive_error_string(a));
138 }
139
140 if (r == ARCHIVE_FATAL)
141 break;
142
143 (void)fprintf(out, "\n");
144 } else {
145 /* mode == 'x' || mode = 'p' */
146 if (mode == 'p') {
147 if (bsdar->options & AR_V) {
148 (void)fprintf(out, "\n<%s>\n\n",
149 name);
150 fflush(out);
151 }
152 r = archive_read_data_into_fd(a, 1);
153 } else {
154 /* mode == 'x' */
155 if (stat(name, &sb) != 0) {
156 if (errno != ENOENT) {
157 bsdar_warnc(bsdar, 0,
158 "stat %s failed",
159 bsdar->filename);
160 continue;
161 }
162 } else {
163 /* stat success, file exist */
164 if (bsdar->options & AR_CC)
165 continue;
166 if (bsdar->options & AR_U &&
167 archive_entry_mtime(entry) <=
168 sb.st_mtime)
169 continue;
170 }
171
172 if (bsdar->options & AR_V)
173 (void)fprintf(out, "x - %s\n", name);
174 /* Disallow absolute paths. */
175 if (name[0] == '/') {
176 bsdar_warnc(bsdar, 0,
177 "Absolute path '%s'", name);
178 continue;
179 }
180 /* Basic path security flags. */
181 flags = ARCHIVE_EXTRACT_SECURE_SYMLINKS |
182 ARCHIVE_EXTRACT_SECURE_NODOTDOT;
183 if (bsdar->options & AR_O)
184 flags |= ARCHIVE_EXTRACT_TIME;
185
186 r = archive_read_extract(a, entry, flags);
187 }
188
189 if (r) {
190 bsdar_warnc(bsdar, archive_errno(a), "%s",
191 archive_error_string(a));
192 exitcode = EXIT_FAILURE;
193 }
194 }
195 }
196
197 if (r == ARCHIVE_FATAL)
198 exitcode = EXIT_FAILURE;
199
200 AC(archive_read_close(a));
201 AC(archive_read_free(a));
202
203 return (exitcode);
204 }
205