1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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#ifndef lint
30static const char rcsid[] =
31  "$FreeBSD$";
32#endif /* not lint */
33
34#include <dirent.h>
35#include <err.h>
36#include <errno.h>
37#include <fcntl.h>
38#include <string.h>
39#include <unistd.h>
40
41#include "pw.h"
42
43void
44copymkdir(int rootfd, char const * dir, int skelfd, mode_t mode, uid_t uid,
45    gid_t gid, int flags)
46{
47	char		*p, lnk[MAXPATHLEN], copybuf[4096];
48	int		len, homefd, srcfd, destfd;
49	ssize_t		sz;
50	struct stat     st;
51	struct dirent  *e;
52	DIR		*d;
53
54	if (*dir == '/')
55		dir++;
56
57	if (mkdirat(rootfd, dir, mode) != 0 && errno != EEXIST) {
58		warn("mkdir(%s)", dir);
59		return;
60	}
61	fchownat(rootfd, dir, uid, gid, AT_SYMLINK_NOFOLLOW);
62	if (flags > 0)
63		chflagsat(rootfd, dir, flags, AT_SYMLINK_NOFOLLOW);
64
65	if (skelfd == -1)
66		return;
67
68	homefd = openat(rootfd, dir, O_DIRECTORY);
69	if ((d = fdopendir(skelfd)) == NULL) {
70		close(skelfd);
71		close(homefd);
72		return;
73	}
74
75	while ((e = readdir(d)) != NULL) {
76		if (strcmp(e->d_name, ".") == 0 || strcmp(e->d_name, "..") == 0)
77			continue;
78
79		p = e->d_name;
80		if (fstatat(skelfd, p, &st, AT_SYMLINK_NOFOLLOW) == -1)
81			continue;
82
83		if (strncmp(p, "dot.", 4) == 0)	/* Conversion */
84			p += 3;
85
86		if (S_ISDIR(st.st_mode)) {
87			copymkdir(homefd, p, openat(skelfd, e->d_name, O_DIRECTORY),
88			    st.st_mode & _DEF_DIRMODE, uid, gid, st.st_flags);
89			continue;
90		}
91
92		if (S_ISLNK(st.st_mode) &&
93		    (len = readlinkat(skelfd, e->d_name, lnk, sizeof(lnk) -1))
94		    != -1) {
95			lnk[len] = '\0';
96			symlinkat(lnk, homefd, p);
97			fchownat(homefd, p, uid, gid, AT_SYMLINK_NOFOLLOW);
98			continue;
99		}
100
101		if (!S_ISREG(st.st_mode))
102			continue;
103
104		if ((srcfd = openat(skelfd, e->d_name, O_RDONLY)) == -1)
105			continue;
106		destfd = openat(homefd, p, O_RDWR | O_CREAT | O_EXCL,
107		    st.st_mode);
108		if (destfd == -1) {
109			close(srcfd);
110			continue;
111		}
112
113		while ((sz = read(srcfd, copybuf, sizeof(copybuf))) > 0)
114			write(destfd, copybuf, sz);
115
116		close(srcfd);
117		/*
118		 * Propagate special filesystem flags
119		 */
120		fchown(destfd, uid, gid);
121		fchflags(destfd, st.st_flags);
122		close(destfd);
123	}
124	closedir(d);
125}
126