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 */
47int
48ar_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