cpdir.c revision 231654 
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 231654 2012-02-14 10:17:03Z kevlo $";
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(char const * dir, char const * skel, mode_t mode, uid_t uid, gid_t gid)
49{
50	char            src[MAXPATHLEN];
51	char            dst[MAXPATHLEN];
52	char            lnk[MAXPATHLEN];
53	int             len;
54
55	if (mkdir(dir, mode) != 0 && errno != EEXIST) {
56		warn("mkdir(%s)", dir);
57	} else {
58		int             infd, outfd;
59		struct stat     st;
60
61		static char     counter = 0;
62		static char    *copybuf = NULL;
63
64		++counter;
65		chown(dir, uid, gid);
66		if (skel != NULL && *skel != '\0') {
67			DIR            *d = opendir(skel);
68
69			if (d != NULL) {
70				struct dirent  *e;
71
72				while ((e = readdir(d)) != NULL) {
73					char           *p = e->d_name;
74
75					if (snprintf(src, sizeof(src), "%s/%s", skel, p) >= (int)sizeof(src))
76						warn("warning: pathname too long '%s/%s' (skel not copied)", skel, p);
77					else if (lstat(src, &st) == 0) {
78						if (strncmp(p, "dot.", 4) == 0)	/* Conversion */
79							p += 3;
80						if (snprintf(dst, sizeof(dst), "%s/%s", dir, p) >= (int)sizeof(dst))
81							warn("warning: path too long '%s/%s' (skel file skipped)", dir, p);
82						else {
83						    if (S_ISDIR(st.st_mode)) {	/* Recurse for this */
84							if (strcmp(e->d_name, ".") != 0 && strcmp(e->d_name, "..") != 0)
85								copymkdir(dst, src, st.st_mode & _DEF_DIRMODE, uid, gid);
86								chflags(dst, st.st_flags);	/* propagate flags */
87						    } else if (S_ISLNK(st.st_mode) && (len = readlink(src, lnk, sizeof(lnk) - 1)) != -1) {
88							lnk[len] = '\0';
89							symlink(lnk, dst);
90							lchown(dst, uid, gid);
91							/*
92							 * Note: don't propagate special attributes
93							 * but do propagate file flags
94							 */
95						    } else if (S_ISREG(st.st_mode) && (outfd = open(dst, O_RDWR | O_CREAT | O_EXCL, st.st_mode)) != -1) {
96							if ((infd = open(src, O_RDONLY)) == -1) {
97								close(outfd);
98								remove(dst);
99							} else {
100								int             b;
101
102								/*
103								 * Allocate our copy buffer if we need to
104								 */
105								if (copybuf == NULL)
106									copybuf = malloc(4096);
107								while ((b = read(infd, copybuf, 4096)) > 0)
108									write(outfd, copybuf, b);
109								close(infd);
110								/*
111								 * Propagate special filesystem flags
112								 */
113								fchown(outfd, uid, gid);
114								fchflags(outfd, st.st_flags);
115								close(outfd);
116								chown(dst, uid, gid);
117							}
118						    }
119						}
120					}
121				}
122				closedir(d);
123			}
124		}
125		if (--counter == 0 && copybuf != NULL) {
126			free(copybuf);
127			copybuf = NULL;
128		}
129	}
130}
131
132