cpdir.c revision 168046 
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 168046 2007-03-30 13:18:52Z le $";
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 "pwupd.h"
45
46void
47copymkdir(char const * dir, char const * skel, mode_t mode, uid_t uid, gid_t gid)
48{
49	char            src[MAXPATHLEN];
50	char            dst[MAXPATHLEN];
51	char            lnk[MAXPATHLEN];
52	int             len;
53
54	if (mkdir(dir, mode) != 0 && errno != EEXIST) {
55		warn("mkdir(%s)", dir);
56	} else {
57		int             infd, outfd;
58		struct stat     st;
59
60		static char     counter = 0;
61		static char    *copybuf = NULL;
62
63		++counter;
64		chown(dir, uid, gid);
65		if (skel != NULL && *skel != '\0') {
66			DIR            *d = opendir(skel);
67
68			if (d != NULL) {
69				struct dirent  *e;
70
71				while ((e = readdir(d)) != NULL) {
72					char           *p = e->d_name;
73
74					if (snprintf(src, sizeof(src), "%s/%s", skel, p) >= (int)sizeof(src))
75						warn("warning: pathname too long '%s/%s' (skel not copied)", skel, p);
76					else if (lstat(src, &st) == 0) {
77						if (strncmp(p, "dot.", 4) == 0)	/* Conversion */
78							p += 3;
79						if (snprintf(dst, sizeof(dst), "%s/%s", dir, p) >= (int)sizeof(dst))
80							warn("warning: path too long '%s/%s' (skel file skipped)", dir, p);
81						else {
82						    if (S_ISDIR(st.st_mode)) {	/* Recurse for this */
83							if (strcmp(e->d_name, ".") != 0 && strcmp(e->d_name, "..") != 0)
84								copymkdir(dst, src, (st.st_mode & 0777), uid, gid);
85								chflags(dst, st.st_flags);	/* propogate flags */
86						    } else if (S_ISLNK(st.st_mode) && (len = readlink(src, lnk, sizeof(lnk))) != -1) {
87							lnk[len] = '\0';
88							symlink(lnk, dst);
89							lchown(dst, uid, gid);
90							/*
91							 * Note: don't propogate special attributes
92							 * but do propogate file flags
93							 */
94						    } else if (S_ISREG(st.st_mode) && (outfd = open(dst, O_RDWR | O_CREAT | O_EXCL, st.st_mode)) != -1) {
95							if ((infd = open(src, O_RDONLY)) == -1) {
96								close(outfd);
97								remove(dst);
98							} else {
99								int             b;
100
101								/*
102								 * Allocate our copy buffer if we need to
103								 */
104								if (copybuf == NULL)
105									copybuf = malloc(4096);
106								while ((b = read(infd, copybuf, 4096)) > 0)
107									write(outfd, copybuf, b);
108								close(infd);
109								/*
110								 * Propogate special filesystem flags
111								 */
112								fchown(outfd, uid, gid);
113								fchflags(outfd, st.st_flags);
114								close(outfd);
115								chown(dst, uid, gid);
116							}
117						    }
118						}
119					}
120				}
121				closedir(d);
122			}
123		}
124		if (--counter == 0 && copybuf != NULL) {
125			free(copybuf);
126			copybuf = NULL;
127		}
128	}
129}
130
131