cpdir.c revision 287084 
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: stable/10/usr.sbin/pw/cpdir.c 287084 2015-08-23 21:42:27Z 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#include "pwupd.h"
41
42void
43copymkdir(int rootfd, char const * dir, int skelfd, mode_t mode, uid_t uid,
44    gid_t gid, int flags)
45{
46	char		*p, lnk[MAXPATHLEN], copybuf[4096];
47	int		len, homefd, srcfd, destfd;
48	ssize_t		sz;
49	struct stat     st;
50	struct dirent  *e;
51	DIR		*d;
52
53	if (*dir == '/')
54		dir++;
55
56	if (mkdirat(rootfd, dir, mode) != 0 && errno != EEXIST) {
57		warn("mkdir(%s)", dir);
58		return;
59	}
60	fchownat(rootfd, dir, uid, gid, AT_SYMLINK_NOFOLLOW);
61	if (flags > 0)
62		chflagsat(rootfd, dir, flags, AT_SYMLINK_NOFOLLOW);
63
64	if (skelfd == -1)
65		return;
66
67	homefd = openat(rootfd, dir, O_DIRECTORY);
68	if ((d = fdopendir(skelfd)) == NULL) {
69		close(skelfd);
70		close(homefd);
71		return;
72	}
73
74	while ((e = readdir(d)) != NULL) {
75		if (strcmp(e->d_name, ".") == 0 || strcmp(e->d_name, "..") == 0)
76			continue;
77
78		p = e->d_name;
79		if (fstatat(skelfd, p, &st, AT_SYMLINK_NOFOLLOW) == -1)
80			continue;
81
82		if (strncmp(p, "dot.", 4) == 0)	/* Conversion */
83			p += 3;
84
85		if (S_ISDIR(st.st_mode)) {
86			copymkdir(homefd, p, openat(skelfd, e->d_name, O_DIRECTORY),
87			    st.st_mode & _DEF_DIRMODE, uid, gid, st.st_flags);
88			continue;
89		}
90
91		if (S_ISLNK(st.st_mode) &&
92		    (len = readlinkat(skelfd, e->d_name, lnk, sizeof(lnk) -1))
93		    != -1) {
94			lnk[len] = '\0';
95			symlinkat(lnk, homefd, p);
96			fchownat(homefd, p, uid, gid, AT_SYMLINK_NOFOLLOW);
97			continue;
98		}
99
100		if (!S_ISREG(st.st_mode))
101			continue;
102
103		if ((srcfd = openat(skelfd, e->d_name, O_RDONLY)) == -1)
104			continue;
105		destfd = openat(homefd, p, O_RDWR | O_CREAT | O_EXCL,
106		    st.st_mode);
107		if (destfd == -1) {
108			close(srcfd);
109			continue;
110		}
111
112		while ((sz = read(srcfd, copybuf, sizeof(copybuf))) > 0)
113			write(destfd, copybuf, sz);
114
115		close(srcfd);
116		/*
117		 * Propagate special filesystem flags
118		 */
119		fchown(destfd, uid, gid);
120		fchflags(destfd, st.st_flags);
121		close(destfd);
122	}
123	closedir(d);
124}
125