1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (C) 1996
5 *	David L. Nugent.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
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 DAVID L. NUGENT AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL DAVID L. NUGENT OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <dirent.h>
30#include <err.h>
31#include <errno.h>
32#include <fcntl.h>
33#include <string.h>
34#include <unistd.h>
35
36#include "pw.h"
37
38void
39copymkdir(int rootfd, char const * dir, int skelfd, mode_t mode, uid_t uid,
40    gid_t gid, int flags)
41{
42	char		*p, lnk[MAXPATHLEN], copybuf[4096];
43	int		len, homefd, srcfd, destfd;
44	ssize_t		sz;
45	struct stat     st;
46	struct dirent  *e;
47	DIR		*d;
48
49	if (*dir == '/')
50		dir++;
51
52	if (mkdirat(rootfd, dir, mode) != 0 && errno != EEXIST) {
53		warn("mkdir(%s)", dir);
54		return;
55	}
56	fchownat(rootfd, dir, uid, gid, AT_SYMLINK_NOFOLLOW);
57	if (flags > 0)
58		chflagsat(rootfd, dir, flags, AT_SYMLINK_NOFOLLOW);
59
60	if (skelfd == -1)
61		return;
62
63	homefd = openat(rootfd, dir, O_DIRECTORY);
64	if ((d = fdopendir(skelfd)) == NULL) {
65		close(skelfd);
66		close(homefd);
67		return;
68	}
69
70	while ((e = readdir(d)) != NULL) {
71		if (strcmp(e->d_name, ".") == 0 || strcmp(e->d_name, "..") == 0)
72			continue;
73
74		p = e->d_name;
75		if (fstatat(skelfd, p, &st, AT_SYMLINK_NOFOLLOW) == -1)
76			continue;
77
78		if (strncmp(p, "dot.", 4) == 0)	/* Conversion */
79			p += 3;
80
81		if (S_ISDIR(st.st_mode)) {
82			copymkdir(homefd, p, openat(skelfd, e->d_name, O_DIRECTORY),
83			    st.st_mode & _DEF_DIRMODE, uid, gid, st.st_flags);
84			continue;
85		}
86
87		if (S_ISLNK(st.st_mode) &&
88		    (len = readlinkat(skelfd, e->d_name, lnk, sizeof(lnk) -1))
89		    != -1) {
90			lnk[len] = '\0';
91			symlinkat(lnk, homefd, p);
92			fchownat(homefd, p, uid, gid, AT_SYMLINK_NOFOLLOW);
93			continue;
94		}
95
96		if (!S_ISREG(st.st_mode))
97			continue;
98
99		if ((srcfd = openat(skelfd, e->d_name, O_RDONLY)) == -1)
100			continue;
101		destfd = openat(homefd, p, O_RDWR | O_CREAT | O_EXCL,
102		    st.st_mode);
103		if (destfd == -1) {
104			close(srcfd);
105			continue;
106		}
107
108		while ((sz = read(srcfd, copybuf, sizeof(copybuf))) > 0)
109			write(destfd, copybuf, sz);
110
111		close(srcfd);
112		/*
113		 * Propagate special filesystem flags
114		 */
115		fchown(destfd, uid, gid);
116		fchflags(destfd, st.st_flags);
117		close(destfd);
118	}
119	closedir(d);
120}
121