1 /* $OpenBSD: utils.c,v 1.26 2004/12/10 10:23:30 jmc Exp $ */
2 /* $NetBSD: utils.c,v 1.6 1997/02/26 14:40:51 cgd Exp $ */
3
4 /*-
5 * Copyright (c) 1991, 1993, 1994
6 * The Regents of the University of California. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 #ifndef lint
34 #if 0
35 static char sccsid[] = "@(#)utils.c 8.3 (Berkeley) 4/1/94";
36 #else
37 static char rcsid[] = "$OpenBSD: utils.c,v 1.26 2004/12/10 10:23:30 jmc Exp $";
38 #endif
39 #endif /* not lint */
40
41 #include <sys/param.h>
42 #include <sys/stat.h>
43 #include <sys/mman.h>
44 #include <sys/time.h>
45
46 #include <err.h>
47 #include <errno.h>
48 #include <fcntl.h>
49 #include <fts.h>
50 #include <stdio.h>
51 #include <stdlib.h>
52 #include <string.h>
53 #include <unistd.h>
54
55 #include "extern.h"
56
57 int
copy_file(FTSENT * entp,int dne)58 copy_file(FTSENT *entp, int dne)
59 {
60 static char buf[MAXBSIZE];
61 struct stat to_stat, *fs;
62 int ch, checkch, from_fd, rcount, rval, to_fd, wcount;
63 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED
64 char *p;
65 #endif
66
67 if ((from_fd = open(entp->fts_path, O_RDONLY, 0)) == -1) {
68 warn("%s", entp->fts_path);
69 return (1);
70 }
71
72 fs = entp->fts_statp;
73
74 /*
75 * In -f (force) mode, we always unlink the destination first
76 * if it exists. Note that -i and -f are mutually exclusive.
77 */
78 if (!dne && fflag)
79 (void)unlink(to.p_path);
80
81 /*
82 * If the file exists and we're interactive, verify with the user.
83 * If the file DNE, set the mode to be the from file, minus setuid
84 * bits, modified by the umask; arguably wrong, but it makes copying
85 * executables work right and it's been that way forever. (The
86 * other choice is 666 or'ed with the execute bits on the from file
87 * modified by the umask.)
88 */
89 if (!dne && !fflag) {
90 if (iflag) {
91 (void)fprintf(stderr, "overwrite %s? ", to.p_path);
92 checkch = ch = getchar();
93 while (ch != '\n' && ch != EOF)
94 ch = getchar();
95 if (checkch != 'y' && checkch != 'Y') {
96 (void)close(from_fd);
97 return (0);
98 }
99 }
100 to_fd = open(to.p_path, O_WRONLY | O_TRUNC, 0);
101 } else
102 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT,
103 fs->st_mode & ~(S_ISTXT | S_ISUID | S_ISGID));
104
105 if (to_fd == -1) {
106 warn("%s", to.p_path);
107 (void)close(from_fd);
108 return (1);
109 }
110
111 rval = 0;
112
113 /*
114 * Mmap and write if less than 8M (the limit is so we don't totally
115 * trash memory on big files. This is really a minor hack, but it
116 * wins some CPU back.
117 */
118 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED
119 if (fs->st_size <= 8 * 1048576) {
120 if ((p = mmap(NULL, (size_t)fs->st_size, PROT_READ,
121 MAP_FILE|MAP_SHARED, from_fd, (off_t)0)) == MAP_FAILED) {
122 warn("mmap: %s", entp->fts_path);
123 rval = 1;
124 } else {
125 madvise(p, fs->st_size, MADV_SEQUENTIAL);
126 if (write(to_fd, p, fs->st_size) != fs->st_size) {
127 warn("%s", to.p_path);
128 rval = 1;
129 }
130 /* Some systems don't unmap on close(2). */
131 if (munmap(p, fs->st_size) < 0) {
132 warn("%s", entp->fts_path);
133 rval = 1;
134 }
135 }
136 } else
137 #endif
138 {
139 while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) {
140 wcount = write(to_fd, buf, rcount);
141 if (rcount != wcount || wcount == -1) {
142 warn("%s", to.p_path);
143 rval = 1;
144 break;
145 }
146 }
147 if (rcount < 0) {
148 warn("%s", entp->fts_path);
149 rval = 1;
150 }
151 }
152
153 if (rval == 1) {
154 (void)close(from_fd);
155 (void)close(to_fd);
156 return (1);
157 }
158
159 if (pflag && setfile(fs, to_fd))
160 rval = 1;
161 /*
162 * If the source was setuid or setgid, lose the bits unless the
163 * copy is owned by the same user and group.
164 */
165 #define RETAINBITS \
166 (S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO)
167 else if (fs->st_mode & (S_ISUID | S_ISGID) && fs->st_uid == myuid) {
168 if (fstat(to_fd, &to_stat)) {
169 warn("%s", to.p_path);
170 rval = 1;
171 } else if (fs->st_gid == to_stat.st_gid &&
172 fchmod(to_fd, fs->st_mode & RETAINBITS & ~myumask)) {
173 warn("%s", to.p_path);
174 rval = 1;
175 }
176 }
177 (void)close(from_fd);
178 if (close(to_fd)) {
179 warn("%s", to.p_path);
180 rval = 1;
181 }
182 return (rval);
183 }
184
185 int
copy_link(FTSENT * p,int exists)186 copy_link(FTSENT *p, int exists)
187 {
188 int len;
189 char link[MAXPATHLEN];
190
191 if ((len = readlink(p->fts_path, link, sizeof(link)-1)) == -1) {
192 warn("readlink: %s", p->fts_path);
193 return (1);
194 }
195 link[len] = '\0';
196 if (exists && unlink(to.p_path)) {
197 warn("unlink: %s", to.p_path);
198 return (1);
199 }
200 if (symlink(link, to.p_path)) {
201 warn("symlink: %s", link);
202 return (1);
203 }
204 return (pflag ? setlink(p->fts_statp) : 0);
205 }
206
207 int
copy_fifo(struct stat * from_stat,int exists)208 copy_fifo(struct stat *from_stat, int exists)
209 {
210 if (exists && unlink(to.p_path)) {
211 warn("unlink: %s", to.p_path);
212 return (1);
213 }
214 if (mkfifo(to.p_path, from_stat->st_mode)) {
215 warn("mkfifo: %s", to.p_path);
216 return (1);
217 }
218 return (pflag ? setfile(from_stat, 0) : 0);
219 }
220
221 int
copy_special(struct stat * from_stat,int exists)222 copy_special(struct stat *from_stat, int exists)
223 {
224 if (exists && unlink(to.p_path)) {
225 warn("unlink: %s", to.p_path);
226 return (1);
227 }
228 if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) {
229 warn("mknod: %s", to.p_path);
230 return (1);
231 }
232 return (pflag ? setfile(from_stat, 0) : 0);
233 }
234
235
236 int
setfile(struct stat * fs,int fd)237 setfile(struct stat *fs, int fd)
238 {
239 static struct timeval tv[2];
240 int rval;
241
242 rval = 0;
243 fs->st_mode &= S_ISTXT | S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO;
244
245 TIMESPEC_TO_TIMEVAL(&tv[0], &fs->st_atimespec);
246 TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtimespec);
247 if (utimes(to.p_path, tv)) {
248 warn("utimes: %s", to.p_path);
249 rval = 1;
250 }
251 /*
252 * Changing the ownership probably won't succeed, unless we're root
253 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting
254 * the mode; current BSD behavior is to remove all setuid bits on
255 * chown. If chown fails, lose setuid/setgid bits.
256 */
257 if (fd ? fchown(fd, fs->st_uid, fs->st_gid) :
258 chown(to.p_path, fs->st_uid, fs->st_gid)) {
259 if (errno != EPERM) {
260 warn("chown: %s", to.p_path);
261 rval = 1;
262 }
263 fs->st_mode &= ~(S_ISTXT | S_ISUID | S_ISGID);
264 }
265 if (fd ? fchmod(fd, fs->st_mode) : chmod(to.p_path, fs->st_mode)) {
266 warn("chown: %s", to.p_path);
267 rval = 1;
268 }
269
270 /*
271 * XXX
272 * NFS doesn't support chflags; ignore errors unless there's reason
273 * to believe we're losing bits. (Note, this still won't be right
274 * if the server supports flags and we were trying to *remove* flags
275 * on a file that we copied, i.e., that we didn't create.)
276 */
277 errno = 0;
278 if (fd ? fchflags(fd, fs->st_flags) : chflags(to.p_path, fs->st_flags))
279 if (errno != EOPNOTSUPP || fs->st_flags != 0) {
280 warn("chflags: %s", to.p_path);
281 rval = 1;
282 }
283 return (rval);
284 }
285
286
287 int
setlink(struct stat * fs)288 setlink(struct stat *fs)
289 {
290
291 if (lchown(to.p_path, fs->st_uid, fs->st_gid)) {
292 if (errno != EPERM) {
293 warn("lchown: %s", to.p_path);
294 return (1);
295 }
296 }
297 return (0);
298 }
299
300
301 void
usage(void)302 usage(void)
303 {
304 (void)fprintf(stderr,
305 "usage: %s [-fip] [-R [-H | -L | -P]] source_file target_file\n", __progname);
306 (void)fprintf(stderr,
307 " %s [-fip] [-R [-H | -L | -P]] source_file ... target_directory\n",
308 __progname);
309 exit(1);
310 }
311