1 /*-
2 * Copyright (c) 2007 Kai Wang
3 * Copyright (c) 2007 Tim Kientzle
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer
11 * in this position and unchanged.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #include <sys/queue.h>
29 #include <sys/stat.h>
30
31 #include <archive.h>
32 #include <archive_entry.h>
33 #include <assert.h>
34 #include <errno.h>
35 #include <libgen.h>
36 #include <stdio.h>
37 #include <stdlib.h>
38 #include <string.h>
39
40 #include "ar.h"
41
42 ELFTC_VCSID("$Id: read.c 3629 2018-09-30 19:26:28Z jkoshy $");
43
44 /*
45 * Handle read modes: 'x', 't' and 'p'.
46 *
47 * Returns EXIT_SUCCESS if all operations completed successfully or returns
48 * EXIT_FAILURE otherwise.
49 */
50 int
ar_read_archive(struct bsdar * bsdar,int mode)51 ar_read_archive(struct bsdar *bsdar, int mode)
52 {
53 FILE *out;
54 struct archive *a;
55 struct archive_entry *entry;
56 struct stat sb;
57 struct tm *tp;
58 const char *bname;
59 const char *name;
60 mode_t md;
61 size_t size;
62 time_t mtime;
63 uid_t uid;
64 gid_t gid;
65 char **av;
66 char buf[25];
67 int found;
68 int exitcode, i, flags, r;
69
70 assert(mode == 'p' || mode == 't' || mode == 'x');
71
72 if ((a = archive_read_new()) == NULL)
73 bsdar_errc(bsdar, 0, "archive_read_new failed");
74 archive_read_support_format_ar(a);
75 AC(archive_read_open_filename(a, bsdar->filename, DEF_BLKSZ));
76
77 exitcode = EXIT_SUCCESS;
78 out = bsdar->output;
79
80 for (;;) {
81 r = archive_read_next_header(a, &entry);
82 if (r == ARCHIVE_WARN || r == ARCHIVE_RETRY ||
83 r == ARCHIVE_FATAL)
84 bsdar_warnc(bsdar, 0, "%s", archive_error_string(a));
85 if (r == ARCHIVE_EOF || r == ARCHIVE_FATAL)
86 break;
87 if (r == ARCHIVE_RETRY) {
88 bsdar_warnc(bsdar, 0, "Retrying...");
89 continue;
90 }
91
92 if (archive_format(a) == ARCHIVE_FORMAT_AR_BSD)
93 bsdar->options |= AR_BSD;
94 else
95 bsdar->options &= ~AR_BSD;
96
97 if ((name = archive_entry_pathname(entry)) == NULL)
98 break;
99
100 /* Skip pseudo members. */
101 if (bsdar_is_pseudomember(bsdar, name))
102 continue;
103
104 /* The ar(5) format only supports 'leaf' file names. */
105 if (strchr(name, '/')) {
106 bsdar_warnc(bsdar, 0, "ignoring entry: %s",
107 name);
108 continue;
109 }
110
111 /*
112 * If we had been given a list of file names to process, check
113 * that the current entry is present in this list.
114 */
115 if (bsdar->argc > 0) {
116 found = 0;
117 for(i = 0; i < bsdar->argc; i++) {
118 av = &bsdar->argv[i];
119 if (*av == NULL)
120 continue;
121 /*
122 * Per POSIX, only the basename of a file
123 * argument should be compared.
124 */
125 if ((bname = basename(*av)) == NULL)
126 bsdar_errc(bsdar, errno,
127 "basename failed");
128 if (strcmp(bname, name) != 0)
129 continue;
130
131 *av = NULL;
132 found = 1;
133 break;
134 }
135 if (!found)
136 continue;
137 }
138
139 if (mode == 't') {
140 if (bsdar->options & AR_V) {
141 md = archive_entry_mode(entry);
142 uid = archive_entry_uid(entry);
143 gid = archive_entry_gid(entry);
144 size = archive_entry_size(entry);
145 mtime = archive_entry_mtime(entry);
146 (void)fprintf(out, "%s %6d/%-6d %8ju ",
147 bsdar_strmode(md) + 1, uid, gid,
148 (uintmax_t)size);
149 tp = localtime(&mtime);
150 (void)strftime(buf, sizeof(buf),
151 "%b %e %H:%M %Y", tp);
152 (void)fprintf(out, "%s %s", buf, name);
153 } else
154 (void)fprintf(out, "%s", name);
155 r = archive_read_data_skip(a);
156 if (r == ARCHIVE_WARN || r == ARCHIVE_RETRY ||
157 r == ARCHIVE_FATAL) {
158 (void)fprintf(out, "\n");
159 bsdar_warnc(bsdar, 0, "%s",
160 archive_error_string(a));
161 }
162
163 if (r == ARCHIVE_FATAL)
164 break;
165
166 (void)fprintf(out, "\n");
167 } else {
168 /* mode == 'x' || mode = 'p' */
169 if (mode == 'p') {
170 if (bsdar->options & AR_V) {
171 (void)fprintf(out, "\n<%s>\n\n",
172 name);
173 fflush(out);
174 }
175 r = archive_read_data_into_fd(a, fileno(out));
176 } else {
177 /* mode == 'x' */
178 if (stat(name, &sb) != 0) {
179 if (errno != ENOENT) {
180 bsdar_warnc(bsdar, errno,
181 "stat %s failed",
182 bsdar->filename);
183 continue;
184 }
185 } else {
186 /* stat success, file exist */
187 if (bsdar->options & AR_CC)
188 continue;
189 if (bsdar->options & AR_U &&
190 archive_entry_mtime(entry) <=
191 sb.st_mtime)
192 continue;
193 }
194
195 if (bsdar->options & AR_V)
196 (void)fprintf(out, "x - %s\n", name);
197 /* Basic path security flags. */
198 flags = ARCHIVE_EXTRACT_SECURE_SYMLINKS |
199 ARCHIVE_EXTRACT_SECURE_NODOTDOT;
200 if (bsdar->options & AR_O)
201 flags |= ARCHIVE_EXTRACT_TIME;
202
203 r = archive_read_extract(a, entry, flags);
204 }
205
206 if (r) {
207 bsdar_warnc(bsdar, 0, "%s",
208 archive_error_string(a));
209 exitcode = EXIT_FAILURE;
210 }
211 }
212 }
213
214 if (r == ARCHIVE_FATAL)
215 exitcode = EXIT_FAILURE;
216
217 AC(archive_read_close(a));
218 ACV(archive_read_free(a));
219
220 return (exitcode);
221 }
222