1 /*- 2 * Copyright (c) 1989, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Ken Smith of The State University of New York at Buffalo. 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 #include <sys/param.h> 34 #include <sys/time.h> 35 #include <sys/wait.h> 36 #include <sys/stat.h> 37 #include <sys/mount.h> 38 39 #include <err.h> 40 #include <errno.h> 41 #include <fcntl.h> 42 #include <grp.h> 43 #include <limits.h> 44 #include <paths.h> 45 #include <pwd.h> 46 #include <signal.h> 47 #include <stdio.h> 48 #include <stdlib.h> 49 #include <string.h> 50 #include <sysexits.h> 51 #include <unistd.h> 52 53 /* Exit code for a failed exec. */ 54 #define EXEC_FAILED 127 55 56 #ifndef _PATH_RM 57 #define _PATH_RM "/bin/rm" 58 #endif 59 60 static int fflg, hflg, iflg, nflg, vflg; 61 static volatile sig_atomic_t info; 62 63 static int copy(const char *, const char *); 64 static int do_move(const char *, const char *); 65 static int fastcopy(const char *, const char *, struct stat *); 66 static void usage(void); 67 static void siginfo(int); 68 69 int 70 main(int argc, char *argv[]) 71 { 72 size_t baselen, len; 73 int rval; 74 char *p, *endp; 75 struct stat sb; 76 int ch; 77 char path[PATH_MAX]; 78 79 while ((ch = getopt(argc, argv, "fhinv")) != -1) 80 switch (ch) { 81 case 'h': 82 hflg = 1; 83 break; 84 case 'i': 85 iflg = 1; 86 fflg = nflg = 0; 87 break; 88 case 'f': 89 fflg = 1; 90 iflg = nflg = 0; 91 break; 92 case 'n': 93 nflg = 1; 94 fflg = iflg = 0; 95 break; 96 case 'v': 97 vflg = 1; 98 break; 99 default: 100 usage(); 101 } 102 argc -= optind; 103 argv += optind; 104 105 signal(SIGINFO, siginfo); 106 107 if (argc < 2) 108 usage(); 109 110 /* 111 * If the stat on the target fails or the target isn't a directory, 112 * try the move. More than 2 arguments is an error in this case. 113 */ 114 if (stat(argv[argc - 1], &sb) || !S_ISDIR(sb.st_mode)) { 115 if (argc > 2) 116 usage(); 117 exit(do_move(argv[0], argv[1])); 118 } 119 120 /* 121 * If -h was specified, treat the target as a symlink instead of 122 * directory. 123 */ 124 if (hflg) { 125 if (argc > 2) 126 usage(); 127 if (lstat(argv[1], &sb) == 0 && S_ISLNK(sb.st_mode)) 128 exit(do_move(argv[0], argv[1])); 129 } 130 131 /* It's a directory, move each file into it. */ 132 if (strlen(argv[argc - 1]) > sizeof(path) - 1) 133 errx(1, "%s: destination pathname too long", *argv); 134 strcpy(path, argv[argc - 1]); 135 baselen = strlen(path); 136 endp = &path[baselen]; 137 if (!baselen || *(endp - 1) != '/') { 138 *endp++ = '/'; 139 ++baselen; 140 } 141 for (rval = 0; --argc; ++argv) { 142 /* 143 * Find the last component of the source pathname. It 144 * may have trailing slashes. 145 */ 146 p = *argv + strlen(*argv); 147 while (p != *argv && p[-1] == '/') 148 --p; 149 while (p != *argv && p[-1] != '/') 150 --p; 151 152 if ((baselen + (len = strlen(p))) >= PATH_MAX) { 153 warnx("%s: destination pathname too long", *argv); 154 rval = 1; 155 } else { 156 memmove(endp, p, (size_t)len + 1); 157 if (do_move(*argv, path)) 158 rval = 1; 159 } 160 } 161 exit(rval); 162 } 163 164 static int 165 do_move(const char *from, const char *to) 166 { 167 struct stat sb; 168 int ask, ch, first; 169 char modep[15]; 170 171 /* 172 * Check access. If interactive and file exists, ask user if it 173 * should be replaced. Otherwise if file exists but isn't writable 174 * make sure the user wants to clobber it. 175 */ 176 if (!fflg && !access(to, F_OK)) { 177 178 /* prompt only if source exist */ 179 if (lstat(from, &sb) == -1) { 180 warn("%s", from); 181 return (1); 182 } 183 184 #define YESNO "(y/n [n]) " 185 ask = 0; 186 if (nflg) { 187 if (vflg) 188 printf("%s not overwritten\n", to); 189 return (0); 190 } else if (iflg) { 191 fprintf(stderr, "overwrite %s? %s", to, YESNO); 192 ask = 1; 193 } else if (access(to, W_OK) && !stat(to, &sb) && isatty(STDIN_FILENO)) { 194 strmode(sb.st_mode, modep); 195 fprintf(stderr, "override %s%s%s/%s for %s? %s", 196 modep + 1, modep[9] == ' ' ? "" : " ", 197 user_from_uid((unsigned long)sb.st_uid, 0), 198 group_from_gid((unsigned long)sb.st_gid, 0), to, YESNO); 199 ask = 1; 200 } 201 if (ask) { 202 first = ch = getchar(); 203 while (ch != '\n' && ch != EOF) 204 ch = getchar(); 205 if (first != 'y' && first != 'Y') { 206 fprintf(stderr, "not overwritten\n"); 207 return (0); 208 } 209 } 210 } 211 /* 212 * Rename on FreeBSD will fail with EISDIR and ENOTDIR, before failing 213 * with EXDEV. Therefore, copy() doesn't have to perform the checks 214 * specified in the Step 3 of the POSIX mv specification. 215 */ 216 if (!rename(from, to)) { 217 if (vflg) 218 printf("%s -> %s\n", from, to); 219 return (0); 220 } 221 222 if (errno == EXDEV) { 223 struct statfs sfs; 224 char path[PATH_MAX]; 225 int target_is_file = 0; 226 227 if (!lstat(to, &sb) && S_ISREG(sb.st_mode)) 228 target_is_file = 1; 229 /* 230 * If the source is a symbolic link and is on another 231 * filesystem, it can be recreated at the destination. 232 */ 233 if (lstat(from, &sb) == -1) { 234 warn("%s", from); 235 return (1); 236 } 237 /* Can't mv(1) directory into a file ever. */ 238 if (target_is_file && S_ISDIR(sb.st_mode)) { 239 warn("cannot overwrite %s with directory", to); 240 return (1); 241 } 242 if (!S_ISLNK(sb.st_mode)) { 243 /* Can't mv(1) a mount point. */ 244 if (realpath(from, path) == NULL) { 245 warn("cannot resolve %s: %s", from, path); 246 return (1); 247 } 248 if (!statfs(path, &sfs) && 249 !strcmp(path, sfs.f_mntonname)) { 250 warnx("cannot rename a mount point"); 251 return (1); 252 } 253 } 254 } else { 255 warn("rename %s to %s", from, to); 256 return (1); 257 } 258 259 /* 260 * If rename fails because we're trying to cross devices, and 261 * it's a regular file, do the copy internally; otherwise, use 262 * cp and rm. 263 */ 264 if (lstat(from, &sb)) { 265 warn("%s", from); 266 return (1); 267 } 268 return (S_ISREG(sb.st_mode) ? 269 fastcopy(from, to, &sb) : copy(from, to)); 270 } 271 272 static int 273 fastcopy(const char *from, const char *to, struct stat *sbp) 274 { 275 struct timeval tval[2]; 276 static u_int blen = MAXPHYS; 277 static char *bp = NULL; 278 mode_t oldmode; 279 int from_fd, to_fd; 280 ssize_t nread; 281 282 if ((from_fd = open(from, O_RDONLY, 0)) < 0) { 283 warn("fastcopy: open() failed (from): %s", from); 284 return (1); 285 } 286 if (bp == NULL && (bp = malloc((size_t)blen)) == NULL) { 287 warnx("malloc(%u) failed", blen); 288 return (1); 289 } 290 while ((to_fd = 291 open(to, O_CREAT | O_EXCL | O_TRUNC | O_WRONLY, 0)) < 0) { 292 if (errno == EEXIST && unlink(to) == 0) 293 continue; 294 warn("fastcopy: open() failed (to): %s", to); 295 close(from_fd); 296 return (1); 297 } 298 while ((nread = read(from_fd, bp, (size_t)blen)) > 0) 299 if (write(to_fd, bp, (size_t)nread) != nread) { 300 warn("fastcopy: write() failed: %s", to); 301 goto err; 302 } 303 if (nread < 0) { 304 warn("fastcopy: read() failed: %s", from); 305 err: if (unlink(to)) 306 warn("%s: remove", to); 307 close(from_fd); 308 close(to_fd); 309 return (1); 310 } 311 312 oldmode = sbp->st_mode & ALLPERMS; 313 if (fchown(to_fd, sbp->st_uid, sbp->st_gid)) { 314 warn("%s: set owner/group (was: %lu/%lu)", to, 315 (u_long)sbp->st_uid, (u_long)sbp->st_gid); 316 if (oldmode & (S_ISUID | S_ISGID)) { 317 warnx( 318 "%s: owner/group changed; clearing suid/sgid (mode was 0%03o)", 319 to, oldmode); 320 sbp->st_mode &= ~(S_ISUID | S_ISGID); 321 } 322 } 323 if (fchmod(to_fd, sbp->st_mode)) 324 warn("%s: set mode (was: 0%03o)", to, oldmode); 325 326 close(from_fd); 327 /* 328 * XXX 329 * NFS doesn't support chflags; ignore errors unless there's reason 330 * to believe we're losing bits. (Note, this still won't be right 331 * if the server supports flags and we were trying to *remove* flags 332 * on a file that we copied, i.e., that we didn't create.) 333 */ 334 errno = 0; 335 if (fchflags(to_fd, (u_long)sbp->st_flags)) 336 if (errno != EOPNOTSUPP || sbp->st_flags != 0) 337 warn("%s: set flags (was: 0%07o)", to, sbp->st_flags); 338 339 tval[0].tv_sec = sbp->st_atime; 340 tval[1].tv_sec = sbp->st_mtime; 341 tval[0].tv_usec = tval[1].tv_usec = 0; 342 if (utimes(to, tval)) 343 warn("%s: set times", to); 344 345 if (close(to_fd)) { 346 warn("%s", to); 347 return (1); 348 } 349 350 if (unlink(from)) { 351 warn("%s: remove", from); 352 return (1); 353 } 354 if (vflg) 355 printf("%s -> %s\n", from, to); 356 return (0); 357 } 358 359 static int 360 copy(const char *from, const char *to) 361 { 362 struct stat sb; 363 int status; 364 pid_t pid; 365 366 if (lstat(to, &sb) == 0) { 367 /* Destination path exists. */ 368 if (S_ISDIR(sb.st_mode)) { 369 if (rmdir(to) != 0) { 370 warn("rmdir %s", to); 371 return (1); 372 } 373 } else { 374 if (unlink(to) != 0) { 375 warn("unlink %s", to); 376 return (1); 377 } 378 } 379 } else if (errno != ENOENT) { 380 warn("%s", to); 381 return (1); 382 } 383 384 /* Copy source to destination. */ 385 if (!(pid = vfork())) { 386 execl(_PATH_CP, "mv", vflg ? "-PRpv" : "-PRp", "--", from, to, 387 NULL); 388 _exit(EXEC_FAILED); 389 } 390 if (waitpid(pid, &status, 0) == -1) { 391 warn("%s %s %s: waitpid", _PATH_CP, from, to); 392 return (1); 393 } 394 if (!WIFEXITED(status)) { 395 warnx("%s %s %s: did not terminate normally", 396 _PATH_CP, from, to); 397 return (1); 398 } 399 switch (WEXITSTATUS(status)) { 400 case 0: 401 break; 402 case EXEC_FAILED: 403 warnx("%s %s %s: exec failed", _PATH_CP, from, to); 404 return (1); 405 default: 406 warnx("%s %s %s: terminated with %d (non-zero) status", 407 _PATH_CP, from, to, WEXITSTATUS(status)); 408 return (1); 409 } 410 411 /* Delete the source. */ 412 if (!(pid = vfork())) { 413 execl(_PATH_RM, "mv", "-rf", "--", from, NULL); 414 _exit(EXEC_FAILED); 415 } 416 if (waitpid(pid, &status, 0) == -1) { 417 warn("%s %s: waitpid", _PATH_RM, from); 418 return (1); 419 } 420 if (!WIFEXITED(status)) { 421 warnx("%s %s: did not terminate normally", _PATH_RM, from); 422 return (1); 423 } 424 switch (WEXITSTATUS(status)) { 425 case 0: 426 break; 427 case EXEC_FAILED: 428 warnx("%s %s: exec failed", _PATH_RM, from); 429 return (1); 430 default: 431 warnx("%s %s: terminated with %d (non-zero) status", 432 _PATH_RM, from, WEXITSTATUS(status)); 433 return (1); 434 } 435 return (0); 436 } 437 438 static void 439 usage(void) 440 { 441 442 fprintf(stderr, "%s\n%s\n", 443 "usage: mv [-f | -i | -n] [-hv] source target", 444 " mv [-f | -i | -n] [-v] source ... directory"); 445 exit(EX_USAGE); 446 } 447 448 static void 449 siginfo(int notused __unused) 450 { 451 info = 1; 452 } 453