utils.c revision 1.2 1 /*-
2 * Copyright (c) 1991, 1993, 1994
3 * The Regents of the University of California. 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 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34 #ifndef lint
35 /*static char sccsid[] = "from: @(#)utils.c 8.3 (Berkeley) 4/1/94";*/
36 static char *rcsid = "$Id: utils.c,v 1.2 1994/09/22 09:24:43 mycroft Exp $";
37 #endif /* not lint */
38
39 #include <sys/param.h>
40 #include <sys/stat.h>
41 #include <sys/mman.h>
42 #include <sys/time.h>
43
44 #include <err.h>
45 #include <errno.h>
46 #include <fcntl.h>
47 #include <fts.h>
48 #include <stdio.h>
49 #include <stdlib.h>
50 #include <string.h>
51 #include <unistd.h>
52
53 #include "extern.h"
54
55 int
56 copy_file(entp, dne)
57 FTSENT *entp;
58 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 * If the file exists and we're interactive, verify with the user.
76 * If the file DNE, set the mode to be the from file, minus setuid
77 * bits, modified by the umask; arguably wrong, but it makes copying
78 * executables work right and it's been that way forever. (The
79 * other choice is 666 or'ed with the execute bits on the from file
80 * modified by the umask.)
81 */
82 if (!dne) {
83 if (iflag) {
84 (void)fprintf(stderr, "overwrite %s? ", to.p_path);
85 checkch = ch = getchar();
86 while (ch != '\n' && ch != EOF)
87 ch = getchar();
88 if (checkch != 'y' && checkch != 'Y') {
89 (void)close(from_fd);
90 return (0);
91 }
92 }
93 to_fd = open(to.p_path, O_WRONLY | O_TRUNC, 0);
94 } else
95 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT,
96 fs->st_mode & ~(S_ISUID | S_ISGID));
97
98 if (to_fd == -1) {
99 warn("%s", to.p_path);
100 (void)close(from_fd);
101 return (1);;
102 }
103
104 rval = 0;
105
106 /*
107 * Mmap and write if less than 8M (the limit is so we don't totally
108 * trash memory on big files. This is really a minor hack, but it
109 * wins some CPU back.
110 */
111 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED
112 if (fs->st_size <= 8 * 1048576) {
113 if ((p = mmap(NULL, (size_t)fs->st_size, PROT_READ,
114 0, from_fd, (off_t)0)) == (char *)-1) {
115 warn("%s", entp->fts_path);
116 rval = 1;
117 } else {
118 if (write(to_fd, p, fs->st_size) != fs->st_size) {
119 warn("%s", to.p_path);
120 rval = 1;
121 }
122 /* Some systems don't unmap on close(2). */
123 if (munmap(p, fs->st_size) < 0) {
124 warn("%s", entp->fts_path);
125 rval = 1;
126 }
127 }
128 } else
129 #endif
130 {
131 while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) {
132 wcount = write(to_fd, buf, rcount);
133 if (rcount != wcount || wcount == -1) {
134 warn("%s", to.p_path);
135 rval = 1;
136 break;
137 }
138 }
139 if (rcount < 0) {
140 warn("%s", entp->fts_path);
141 rval = 1;
142 }
143 }
144
145 /* If the copy went bad, lose the file. */
146 if (rval == 1) {
147 (void)unlink(to.p_path);
148 (void)close(from_fd);
149 (void)close(to_fd);
150 return (1);
151 }
152
153 if (pflag && setfile(fs, to_fd))
154 rval = 1;
155 /*
156 * If the source was setuid or setgid, lose the bits unless the
157 * copy is owned by the same user and group.
158 */
159 #define RETAINBITS \
160 (S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO)
161 else if (fs->st_mode & (S_ISUID | S_ISGID) && fs->st_uid == myuid)
162 if (fstat(to_fd, &to_stat)) {
163 warn("%s", to.p_path);
164 rval = 1;
165 } else if (fs->st_gid == to_stat.st_gid &&
166 fchmod(to_fd, fs->st_mode & RETAINBITS & ~myumask)) {
167 warn("%s", to.p_path);
168 rval = 1;
169 }
170 (void)close(from_fd);
171 if (close(to_fd)) {
172 warn("%s", to.p_path);
173 rval = 1;
174 }
175 return (rval);
176 }
177
178 int
179 copy_link(p, exists)
180 FTSENT *p;
181 int exists;
182 {
183 int len;
184 char link[MAXPATHLEN];
185
186 if ((len = readlink(p->fts_path, link, sizeof(link))) == -1) {
187 warn("readlink: %s", p->fts_path);
188 return (1);
189 }
190 link[len] = '\0';
191 if (exists && unlink(to.p_path)) {
192 warn("unlink: %s", to.p_path);
193 return (1);
194 }
195 if (symlink(link, to.p_path)) {
196 warn("symlink: %s", link);
197 return (1);
198 }
199 return (0);
200 }
201
202 int
203 copy_fifo(from_stat, exists)
204 struct stat *from_stat;
205 int exists;
206 {
207 if (exists && unlink(to.p_path)) {
208 warn("unlink: %s", to.p_path);
209 return (1);
210 }
211 if (mkfifo(to.p_path, from_stat->st_mode)) {
212 warn("mkfifo: %s", to.p_path);
213 return (1);
214 }
215 return (pflag ? setfile(from_stat, 0) : 0);
216 }
217
218 int
219 copy_special(from_stat, exists)
220 struct stat *from_stat;
221 int exists;
222 {
223 if (exists && unlink(to.p_path)) {
224 warn("unlink: %s", to.p_path);
225 return (1);
226 }
227 if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) {
228 warn("mknod: %s", to.p_path);
229 return (1);
230 }
231 return (pflag ? setfile(from_stat, 0) : 0);
232 }
233
234
235 int
236 setfile(fs, fd)
237 register struct stat *fs;
238 int fd;
239 {
240 static struct timeval tv[2];
241 int rval;
242
243 rval = 0;
244 fs->st_mode &= S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO;
245
246 TIMESPEC_TO_TIMEVAL(&tv[0], &fs->st_atimespec);
247 TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtimespec);
248 if (utimes(to.p_path, tv)) {
249 warn("utimes: %s", to.p_path);
250 rval = 1;
251 }
252 /*
253 * Changing the ownership probably won't succeed, unless we're root
254 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting
255 * the mode; current BSD behavior is to remove all setuid bits on
256 * chown. If chown fails, lose setuid/setgid bits.
257 */
258 if (fd ? fchown(fd, fs->st_uid, fs->st_gid) :
259 chown(to.p_path, fs->st_uid, fs->st_gid)) {
260 if (errno != EPERM) {
261 warn("chown: %s", to.p_path);
262 rval = 1;
263 }
264 fs->st_mode &= ~(S_ISUID | S_ISGID);
265 }
266 if (fd ? fchmod(fd, fs->st_mode) : chmod(to.p_path, fs->st_mode)) {
267 warn("chown: %s", to.p_path);
268 rval = 1;
269 }
270
271 if (fd ?
272 fchflags(fd, fs->st_flags) : chflags(to.p_path, fs->st_flags)) {
273 warn("chflags: %s", to.p_path);
274 rval = 1;
275 }
276 return (rval);
277 }
278
279 void
280 usage()
281 {
282 (void)fprintf(stderr, "%s\n%s\n",
283 "usage: cp [-R [-H | -L | -P] [-fip] src target",
284 " cp [-R [-H | -L | -P] [-fip] src1 ... srcN directory");
285 exit(1);
286 }
287