1/*-
2 * Copyright (C) 1996
3 *	David L. Nugent.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY DAVID L. NUGENT AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL DAVID L. NUGENT OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#ifndef lint
28static const char rcsid[] =
29  "$FreeBSD: releng/11.0/usr.sbin/pw/cpdir.c 297290 2016-03-26 11:41:35Z bapt $";
30#endif /* not lint */
31
32#include <dirent.h>
33#include <err.h>
34#include <errno.h>
35#include <fcntl.h>
36#include <string.h>
37#include <unistd.h>
38
39#include "pw.h"
40
41void
42copymkdir(int rootfd, char const * dir, int skelfd, mode_t mode, uid_t uid,
43    gid_t gid, int flags)
44{
45	char		*p, lnk[MAXPATHLEN], copybuf[4096];
46	int		len, homefd, srcfd, destfd;
47	ssize_t		sz;
48	struct stat     st;
49	struct dirent  *e;
50	DIR		*d;
51
52	if (*dir == '/')
53		dir++;
54
55	if (mkdirat(rootfd, dir, mode) != 0 && errno != EEXIST) {
56		warn("mkdir(%s)", dir);
57		return;
58	}
59	fchownat(rootfd, dir, uid, gid, AT_SYMLINK_NOFOLLOW);
60	if (flags > 0)
61		chflagsat(rootfd, dir, flags, AT_SYMLINK_NOFOLLOW);
62
63	if (skelfd == -1)
64		return;
65
66	homefd = openat(rootfd, dir, O_DIRECTORY);
67	if ((d = fdopendir(skelfd)) == NULL) {
68		close(skelfd);
69		close(homefd);
70		return;
71	}
72
73	while ((e = readdir(d)) != NULL) {
74		if (strcmp(e->d_name, ".") == 0 || strcmp(e->d_name, "..") == 0)
75			continue;
76
77		p = e->d_name;
78		if (fstatat(skelfd, p, &st, AT_SYMLINK_NOFOLLOW) == -1)
79			continue;
80
81		if (strncmp(p, "dot.", 4) == 0)	/* Conversion */
82			p += 3;
83
84		if (S_ISDIR(st.st_mode)) {
85			copymkdir(homefd, p, openat(skelfd, e->d_name, O_DIRECTORY),
86			    st.st_mode & _DEF_DIRMODE, uid, gid, st.st_flags);
87			continue;
88		}
89
90		if (S_ISLNK(st.st_mode) &&
91		    (len = readlinkat(skelfd, e->d_name, lnk, sizeof(lnk) -1))
92		    != -1) {
93			lnk[len] = '\0';
94			symlinkat(lnk, homefd, p);
95			fchownat(homefd, p, uid, gid, AT_SYMLINK_NOFOLLOW);
96			continue;
97		}
98
99		if (!S_ISREG(st.st_mode))
100			continue;
101
102		if ((srcfd = openat(skelfd, e->d_name, O_RDONLY)) == -1)
103			continue;
104		destfd = openat(homefd, p, O_RDWR | O_CREAT | O_EXCL,
105		    st.st_mode);
106		if (destfd == -1) {
107			close(srcfd);
108			continue;
109		}
110
111		while ((sz = read(srcfd, copybuf, sizeof(copybuf))) > 0)
112			write(destfd, copybuf, sz);
113
114		close(srcfd);
115		/*
116		 * Propagate special filesystem flags
117		 */
118		fchown(destfd, uid, gid);
119		fchflags(destfd, st.st_flags);
120		close(destfd);
121	}
122	closedir(d);
123}
124