cpdir.c revision 285430 
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: head/usr.sbin/pw/cpdir.c 285430 2015-07-12 20:29:51Z bapt $";
30#endif /* not lint */
31
32#include <err.h>
33#include <errno.h>
34#include <fcntl.h>
35#include <stdio.h>
36#include <string.h>
37#include <stdlib.h>
38#include <unistd.h>
39#include <sys/types.h>
40#include <sys/stat.h>
41#include <sys/param.h>
42#include <dirent.h>
43
44#include "pw.h"
45#include "pwupd.h"
46
47void
48copymkdir(int rootfd, char const * dir, int skelfd, mode_t mode, uid_t uid,
49    gid_t gid, int flags)
50{
51	char		*p, lnk[MAXPATHLEN], copybuf[4096];
52	int		len, homefd, srcfd, destfd;
53	ssize_t		sz;
54	struct stat     st;
55	struct dirent  *e;
56	DIR		*d;
57
58	if (*dir == '/')
59		dir++;
60
61	if (mkdirat(rootfd, dir, mode) != 0 && errno != EEXIST) {
62		warn("mkdir(%s)", dir);
63		return;
64	}
65	fchownat(rootfd, dir, uid, gid, AT_SYMLINK_NOFOLLOW);
66	if (flags > 0)
67		chflagsat(rootfd, dir, flags, AT_SYMLINK_NOFOLLOW);
68
69	if (skelfd == -1)
70		return;
71
72	homefd = openat(rootfd, dir, O_DIRECTORY);
73	if ((d = fdopendir(skelfd)) == NULL) {
74		close(skelfd);
75		close(homefd);
76		return;
77	}
78
79	while ((e = readdir(d)) != NULL) {
80		if (strcmp(e->d_name, ".") == 0 || strcmp(e->d_name, "..") == 0)
81			continue;
82
83		p = e->d_name;
84		if (fstatat(skelfd, p, &st, AT_SYMLINK_NOFOLLOW) == -1)
85			continue;
86
87		if (strncmp(p, "dot.", 4) == 0)	/* Conversion */
88			p += 3;
89
90		if (S_ISDIR(st.st_mode)) {
91			copymkdir(homefd, p, openat(skelfd, e->d_name, O_DIRECTORY),
92			    st.st_mode & _DEF_DIRMODE, uid, gid, st.st_flags);
93			continue;
94		}
95
96		if (S_ISLNK(st.st_mode) &&
97		    (len = readlinkat(skelfd, e->d_name, lnk, sizeof(lnk) -1))
98		    != -1) {
99			lnk[len] = '\0';
100			symlinkat(lnk, homefd, p);
101			fchownat(homefd, p, uid, gid, AT_SYMLINK_NOFOLLOW);
102			continue;
103		}
104
105		if (!S_ISREG(st.st_mode))
106			continue;
107
108		if ((srcfd = openat(skelfd, e->d_name, O_RDONLY)) == -1)
109			continue;
110		destfd = openat(homefd, p, O_RDWR | O_CREAT | O_EXCL,
111		    st.st_mode);
112		if (destfd == -1) {
113			close(srcfd);
114			continue;
115		}
116
117		while ((sz = read(srcfd, copybuf, sizeof(copybuf))) > 0)
118			write(destfd, copybuf, sz);
119
120		close(srcfd);
121		/*
122		 * Propagate special filesystem flags
123		 */
124		fchown(destfd, uid, gid);
125		fchflags(destfd, st.st_flags);
126		close(destfd);
127	}
128	closedir(d);
129}
130