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. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #include <sys/param.h>
31 #include <sys/stat.h>
32 #include <sys/time.h>
33 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED
34 #include <sys/mman.h>
35 #endif
36
37 #include <err.h>
38 #include <errno.h>
39 #include <fcntl.h>
40 #include <fts.h>
41 #include <limits.h>
42 #include <stdio.h>
43 #include <stdlib.h>
44 #include <sysexits.h>
45 #include <unistd.h>
46
47 #include "extern.h"
48
49 #define cp_pct(x, y) ((y == 0) ? 0 : (int)(100.0 * (x) / (y)))
50
51
52 int
copy_file(const FTSENT * entp,int dne)53 copy_file(const FTSENT *entp, int dne)
54 {
55 static char buf[MAXBSIZE];
56 struct stat *fs;
57 ssize_t wcount, rcount;
58 size_t wresid;
59 off_t wtotal;
60 int ch, checkch, from_fd = 0, rval, to_fd = 0;
61 char *bufp;
62 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED
63 char *p;
64 #endif
65
66 if ((from_fd = open(entp->fts_path, O_RDONLY, 0)) == -1) {
67 warn("%s", entp->fts_path);
68 return (1);
69 }
70
71 fs = entp->fts_statp;
72
73 /*
74 * If the file exists and we're interactive, verify with the user.
75 * If the file DNE, set the mode to be the from file, minus setuid
76 * bits, modified by the umask; arguably wrong, but it makes copying
77 * executables work right and it's been that way forever. (The
78 * other choice is 666 or'ed with the execute bits on the from file
79 * modified by the umask.)
80 */
81 if (!dne) {
82 #define YESNO "(y/n [n]) "
83 if (nflag) {
84 if (vflag)
85 printf("%s not overwritten\n", to.p_path);
86 close(from_fd);
87 return (0);
88 } else if (iflag) {
89 fprintf(stderr, "overwrite %s? %s",
90 to.p_path, YESNO);
91 checkch = ch = getchar();
92 while (ch != '\n' && ch != EOF)
93 ch = getchar();
94 if (checkch != 'y' && checkch != 'Y') {
95 close(from_fd);
96 fprintf(stderr, "not overwritten\n");
97 return (1);
98 }
99 }
100
101 if (fflag) {
102 /* remove existing destination file name,
103 * create a new file */
104 unlink(to.p_path);
105 if (!lflag)
106 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT,
107 fs->st_mode & ~(S_ISUID | S_ISGID));
108 } else {
109 if (!lflag)
110 /* overwrite existing destination file name */
111 to_fd = open(to.p_path, O_WRONLY | O_TRUNC, 0);
112 }
113 } else {
114 if (!lflag)
115 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT,
116 fs->st_mode & ~(S_ISUID | S_ISGID));
117 }
118
119 if (to_fd == -1) {
120 warn("%s", to.p_path);
121 close(from_fd);
122 return (1);
123 }
124
125 rval = 0;
126
127 if (!lflag) {
128 /*
129 * Mmap and write if less than 8M (the limit is so we don't totally
130 * trash memory on big files. This is really a minor hack, but it
131 * wins some CPU back.
132 * Some filesystems, such as smbnetfs, don't support mmap,
133 * so this is a best-effort attempt.
134 */
135 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED
136 if (S_ISREG(fs->st_mode) && fs->st_size > 0 &&
137 fs->st_size <= 8 * 1024 * 1024 &&
138 (p = mmap(NULL, (size_t)fs->st_size, PROT_READ,
139 MAP_SHARED, from_fd, (off_t)0)) != MAP_FAILED) {
140 wtotal = 0;
141 for (bufp = p, wresid = fs->st_size; ;
142 bufp += wcount, wresid -= (size_t)wcount) {
143 wcount = write(to_fd, bufp, wresid);
144 if (wcount <= 0)
145 break;
146 wtotal += wcount;
147 if (info) {
148 info = 0;
149 fprintf(stderr,
150 "%s -> %s %3d%%\n",
151 entp->fts_path, to.p_path,
152 cp_pct(wtotal, fs->st_size));
153 }
154 if (wcount >= (ssize_t)wresid)
155 break;
156 }
157 if (wcount != (ssize_t)wresid) {
158 warn("%s", to.p_path);
159 rval = 1;
160 }
161 /* Some systems don't unmap on close(2). */
162 if (munmap(p, fs->st_size) < 0) {
163 warn("%s", entp->fts_path);
164 rval = 1;
165 }
166 } else
167 #endif
168 {
169 wtotal = 0;
170 while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) {
171 for (bufp = buf, wresid = rcount; ;
172 bufp += wcount, wresid -= wcount) {
173 wcount = write(to_fd, bufp, wresid);
174 if (wcount <= 0)
175 break;
176 wtotal += wcount;
177 if (info) {
178 info = 0;
179 fprintf(stderr,
180 "%s -> %s %3d%%\n",
181 entp->fts_path, to.p_path,
182 cp_pct(wtotal, fs->st_size));
183 }
184 if (wcount >= (ssize_t)wresid)
185 break;
186 }
187 if (wcount != (ssize_t)wresid) {
188 warn("%s", to.p_path);
189 rval = 1;
190 break;
191 }
192 }
193 if (rcount < 0) {
194 warn("%s", entp->fts_path);
195 rval = 1;
196 }
197 }
198 } else {
199 if (link(entp->fts_path, to.p_path)) {
200 warn("%s", to.p_path);
201 rval = 1;
202 }
203 }
204
205 /*
206 * Don't remove the target even after an error. The target might
207 * not be a regular file, or its attributes might be important,
208 * or its contents might be irreplaceable. It would only be safe
209 * to remove it if we created it and its length is 0.
210 */
211
212 if (!lflag) {
213 if (pflag && setfile(fs, to_fd))
214 rval = 1;
215 if (close(to_fd)) {
216 warn("%s", to.p_path);
217 rval = 1;
218 }
219 }
220
221 close(from_fd);
222
223 return (rval);
224 }
225
226 int
copy_link(const FTSENT * p,int exists)227 copy_link(const FTSENT *p, int exists)
228 {
229 int len;
230 char llink[PATH_MAX];
231
232 if ((len = readlink(p->fts_path, llink, sizeof(llink) - 1)) == -1) {
233 warn("readlink: %s", p->fts_path);
234 return (1);
235 }
236 llink[len] = '\0';
237 if (exists && unlink(to.p_path)) {
238 warn("unlink: %s", to.p_path);
239 return (1);
240 }
241 if (symlink(llink, to.p_path)) {
242 warn("symlink: %s", llink);
243 return (1);
244 }
245 return (pflag ? setfile(p->fts_statp, -1) : 0);
246 }
247
248 int
copy_fifo(struct stat * from_stat,int exists)249 copy_fifo(struct stat *from_stat, int exists)
250 {
251 if (exists && unlink(to.p_path)) {
252 warn("unlink: %s", to.p_path);
253 return (1);
254 }
255 if (mkfifo(to.p_path, from_stat->st_mode)) {
256 warn("mkfifo: %s", to.p_path);
257 return (1);
258 }
259 return (pflag ? setfile(from_stat, -1) : 0);
260 }
261
262 int
copy_special(struct stat * from_stat,int exists)263 copy_special(struct stat *from_stat, int exists)
264 {
265 if (exists && unlink(to.p_path)) {
266 warn("unlink: %s", to.p_path);
267 return (1);
268 }
269 if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) {
270 warn("mknod: %s", to.p_path);
271 return (1);
272 }
273 return (pflag ? setfile(from_stat, -1) : 0);
274 }
275
276 int
setfile(struct stat * fs,int fd)277 setfile(struct stat *fs, int fd)
278 {
279 static struct timeval tv[2];
280 struct stat ts;
281 int rval, gotstat, islink, fdval;
282
283 rval = 0;
284 fdval = fd != -1;
285 islink = !fdval && S_ISLNK(fs->st_mode);
286 fs->st_mode &= S_ISUID | S_ISGID | S_ISVTX |
287 S_IRWXU | S_IRWXG | S_IRWXO;
288
289 TIMESPEC_TO_TIMEVAL(&tv[0], &fs->st_atimespec);
290 TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtimespec);
291 if (islink ? lutimes(to.p_path, tv) : utimes(to.p_path, tv)) {
292 warn("%sutimes: %s", islink ? "l" : "", to.p_path);
293 rval = 1;
294 }
295 if (fdval ? fstat(fd, &ts) :
296 (islink ? lstat(to.p_path, &ts) : stat(to.p_path, &ts)))
297 gotstat = 0;
298 else {
299 gotstat = 1;
300 ts.st_mode &= S_ISUID | S_ISGID | S_ISVTX |
301 S_IRWXU | S_IRWXG | S_IRWXO;
302 }
303 /*
304 * Changing the ownership probably won't succeed, unless we're root
305 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting
306 * the mode; current BSD behavior is to remove all setuid bits on
307 * chown. If chown fails, lose setuid/setgid bits.
308 */
309 if (!gotstat || fs->st_uid != ts.st_uid || fs->st_gid != ts.st_gid)
310 if (fdval ? fchown(fd, fs->st_uid, fs->st_gid) :
311 (islink ? lchown(to.p_path, fs->st_uid, fs->st_gid) :
312 chown(to.p_path, fs->st_uid, fs->st_gid))) {
313 if (errno != EPERM) {
314 warn("chown: %s", to.p_path);
315 rval = 1;
316 }
317 fs->st_mode &= ~(S_ISUID | S_ISGID);
318 }
319
320 if (!gotstat || fs->st_mode != ts.st_mode)
321 if (fdval ? fchmod(fd, fs->st_mode) :
322 (islink ? lchmod(to.p_path, fs->st_mode) :
323 chmod(to.p_path, fs->st_mode))) {
324 warn("chmod: %s", to.p_path);
325 rval = 1;
326 }
327
328 #ifdef _ST_FLAGS_PRESENT_
329 if (!gotstat || fs->st_flags != ts.st_flags)
330 if (fdval ?
331 fchflags(fd, fs->st_flags) :
332 (islink ? lchflags(to.p_path, fs->st_flags) :
333 chflags(to.p_path, fs->st_flags))) {
334 warn("chflags: %s", to.p_path);
335 rval = 1;
336 }
337 #endif
338
339 return (rval);
340 }
341
342 void
usage(void)343 usage(void)
344 {
345
346 fprintf(stderr, "%s\n%s\n",
347 "usage: cp [-R [-H | -L | -P]] [-f | -i | -n] [-alpvx] source_file target_file",
348 " cp [-R [-H | -L | -P]] [-f | -i | -n] [-alpvx] source_file ... "
349 "target_directory");
350 exit(EX_USAGE);
351 }
352