1 /* $OpenBSD: mv.c,v 1.47 2021/10/24 21:24:21 deraadt Exp $ */ 2 /* $NetBSD: mv.c,v 1.9 1995/03/21 09:06:52 cgd Exp $ */ 3 4 /* 5 * Copyright (c) 1989, 1993, 1994 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * Ken Smith of The State University of New York at Buffalo. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/time.h> 37 #include <sys/wait.h> 38 #include <sys/stat.h> 39 #include <sys/mount.h> 40 41 #include <err.h> 42 #include <errno.h> 43 #include <fcntl.h> 44 #include <stdio.h> 45 #include <stdlib.h> 46 #include <string.h> 47 #include <unistd.h> 48 #include <limits.h> 49 #include <pwd.h> 50 #include <grp.h> 51 52 extern char *__progname; 53 54 int fflg, iflg, vflg; 55 int stdin_ok; 56 57 extern int cpmain(int argc, char **argv); 58 extern int rmmain(int argc, char **argv); 59 60 int mvcopy(char *, char *); 61 int do_move(char *, char *); 62 int fastcopy(char *, char *, struct stat *); 63 void usage(void); 64 65 int 66 main(int argc, char *argv[]) 67 { 68 int baselen, len, rval; 69 char *p, *endp; 70 struct stat sb; 71 int ch; 72 char path[PATH_MAX]; 73 74 while ((ch = getopt(argc, argv, "ifv")) != -1) 75 switch (ch) { 76 case 'i': 77 fflg = 0; 78 iflg = 1; 79 break; 80 case 'f': 81 iflg = 0; 82 fflg = 1; 83 break; 84 case 'v': 85 vflg = 1; 86 break; 87 default: 88 usage(); 89 } 90 argc -= optind; 91 argv += optind; 92 93 if (argc < 2) 94 usage(); 95 96 stdin_ok = isatty(STDIN_FILENO); 97 98 /* 99 * If the stat on the target fails or the target isn't a directory, 100 * try the move. More than 2 arguments is an error in this case. 101 */ 102 if (stat(argv[argc - 1], &sb) || !S_ISDIR(sb.st_mode)) { 103 if (argc > 2) 104 usage(); 105 exit(do_move(argv[0], argv[1])); 106 } 107 108 /* It's a directory, move each file into it. */ 109 if (strlcpy(path, argv[argc - 1], sizeof path) >= sizeof path) 110 errx(1, "%s: destination pathname too long", *argv); 111 baselen = strlen(path); 112 endp = &path[baselen]; 113 if (*(endp - 1) != '/') { 114 *endp++ = '/'; 115 ++baselen; 116 } 117 for (rval = 0; --argc; ++argv) { 118 char *current_arg = *argv; 119 120 /* 121 * Get the name of the file to create from 122 * the argument. This is a bit tricky because 123 * in the case of b/ we actually want b and empty 124 * string 125 */ 126 if ((p = strrchr(current_arg, '/')) == NULL) 127 p = current_arg; 128 else { 129 /* Special case foo/ */ 130 if (!*(p+1)) { 131 while (p >= current_arg && *p == '/') 132 p--; 133 134 while (p >= current_arg && *p != '/') 135 p--; 136 } 137 138 p++; 139 } 140 141 if ((baselen + (len = strlen(p))) >= PATH_MAX) { 142 warnx("%s: destination pathname too long", *argv); 143 rval = 1; 144 } else { 145 memmove(endp, p, len + 1); 146 if (do_move(current_arg, path)) 147 rval = 1; 148 } 149 } 150 exit(rval); 151 } 152 153 int 154 do_move(char *from, char *to) 155 { 156 struct stat sb, fsb; 157 char modep[15]; 158 159 /* Source path must exist (symlink is OK). */ 160 if (lstat(from, &fsb)) { 161 warn("%s", from); 162 return (1); 163 } 164 165 /* 166 * (1) If the destination path exists, the -f option is not specified 167 * and either of the following conditions are true: 168 * 169 * (a) The permissions of the destination path do not permit 170 * writing and the standard input is a terminal. 171 * (b) The -i option is specified. 172 * 173 * the mv utility shall write a prompt to standard error and 174 * read a line from standard input. If the response is not 175 * affirmative, mv shall do nothing more with the current 176 * source file... 177 */ 178 if (!fflg && !access(to, F_OK)) { 179 int ask = 1; 180 int ch, first; 181 182 if (iflg && !access(from, F_OK)) { 183 (void)fprintf(stderr, "overwrite %s? ", to); 184 } else if (stdin_ok && access(to, W_OK) && !stat(to, &sb)) { 185 strmode(sb.st_mode, modep); 186 (void)fprintf(stderr, "override %s%s%s/%s for %s? ", 187 modep + 1, modep[9] == ' ' ? "" : " ", 188 user_from_uid(sb.st_uid, 0), 189 group_from_gid(sb.st_gid, 0), to); 190 } else 191 ask = 0; 192 if (ask) { 193 first = ch = getchar(); 194 while (ch != '\n' && ch != EOF) 195 ch = getchar(); 196 if (first != 'y' && first != 'Y') 197 return (0); 198 } 199 } 200 201 /* 202 * (2) If rename() succeeds, mv shall do nothing more with the 203 * current source file. If it fails for any other reason than 204 * EXDEV, mv shall write a diagnostic message to the standard 205 * error and do nothing more with the current source file. 206 * 207 * (3) If the destination path exists, and it is a file of type 208 * directory and source_file is not a file of type directory, 209 * or it is a file not of type directory, and source file is 210 * a file of type directory, mv shall write a diagnostic 211 * message to standard error, and do nothing more with the 212 * current source file... 213 */ 214 if (!rename(from, to)) { 215 if (vflg) 216 (void)fprintf(stdout, "%s -> %s\n", from, to); 217 return (0); 218 } 219 220 if (errno != EXDEV) { 221 warn("rename %s to %s", from, to); 222 return (1); 223 } 224 225 /* Disallow moving a mount point. */ 226 if (S_ISDIR(fsb.st_mode)) { 227 struct statfs sfs; 228 char path[PATH_MAX]; 229 230 if (realpath(from, path) == NULL) { 231 warnx("cannot resolve %s", from); 232 return (1); 233 } 234 if (!statfs(path, &sfs) && !strcmp(path, sfs.f_mntonname)) { 235 warnx("cannot rename a mount point"); 236 return (1); 237 } 238 } 239 240 /* 241 * (4) If the destination path exists, mv shall attempt to remove it. 242 * If this fails for any reason, mv shall write a diagnostic 243 * message to the standard error and do nothing more with the 244 * current source file... 245 */ 246 if (!lstat(to, &sb)) { 247 if ((S_ISDIR(sb.st_mode)) ? rmdir(to) : unlink(to)) { 248 warn("can't remove %s", to); 249 return (1); 250 } 251 } 252 253 /* 254 * (5) The file hierarchy rooted in source_file shall be duplicated 255 * as a file hierarchy rooted in the destination path... 256 */ 257 return (S_ISREG(fsb.st_mode) ? 258 fastcopy(from, to, &fsb) : mvcopy(from, to)); 259 } 260 261 int 262 fastcopy(char *from, char *to, struct stat *sbp) 263 { 264 struct timespec ts[2]; 265 static u_int32_t blen; 266 static char *bp; 267 int nread, from_fd, to_fd; 268 int badchown = 0, serrno = 0; 269 270 if (!blen) { 271 blen = sbp->st_blksize; 272 if ((bp = malloc(blen)) == NULL) { 273 warn(NULL); 274 blen = 0; 275 return (1); 276 } 277 } 278 279 if ((from_fd = open(from, O_RDONLY)) == -1) { 280 warn("%s", from); 281 return (1); 282 } 283 if ((to_fd = open(to, O_CREAT | O_TRUNC | O_WRONLY, 0600)) == -1) { 284 warn("%s", to); 285 (void)close(from_fd); 286 return (1); 287 } 288 289 if (fchown(to_fd, sbp->st_uid, sbp->st_gid)) { 290 serrno = errno; 291 badchown = 1; 292 } 293 (void) fchmod(to_fd, sbp->st_mode & ~(S_ISUID|S_ISGID)); 294 295 while ((nread = read(from_fd, bp, blen)) > 0) 296 if (write(to_fd, bp, nread) != nread) { 297 warn("%s", to); 298 goto err; 299 } 300 if (nread == -1) { 301 warn("%s", from); 302 err: if (unlink(to)) 303 warn("%s: remove", to); 304 (void)close(from_fd); 305 (void)close(to_fd); 306 return (1); 307 } 308 (void)close(from_fd); 309 310 if (badchown) { 311 if ((sbp->st_mode & (S_ISUID|S_ISGID))) { 312 warnc(serrno, 313 "%s: set owner/group; not setting setuid/setgid", 314 to); 315 sbp->st_mode &= ~(S_ISUID|S_ISGID); 316 } else if (!fflg) 317 warnc(serrno, "%s: set owner/group", to); 318 } 319 if (fchmod(to_fd, sbp->st_mode)) 320 warn("%s: set mode", to); 321 322 /* 323 * XXX 324 * NFS doesn't support chflags; ignore errors unless there's reason 325 * to believe we're losing bits. (Note, this still won't be right 326 * if the server supports flags and we were trying to *remove* flags 327 * on a file that we copied, i.e., that we didn't create.) 328 */ 329 errno = 0; 330 if (fchflags(to_fd, sbp->st_flags)) 331 if (errno != EOPNOTSUPP || sbp->st_flags != 0) 332 warn("%s: set flags", to); 333 334 ts[0] = sbp->st_atim; 335 ts[1] = sbp->st_mtim; 336 if (futimens(to_fd, ts)) 337 warn("%s: set times", to); 338 339 if (close(to_fd)) { 340 warn("%s", to); 341 return (1); 342 } 343 344 if (unlink(from)) { 345 warn("%s: remove", from); 346 return (1); 347 } 348 349 if (vflg) 350 (void)fprintf(stdout, "%s -> %s\n", from, to); 351 352 return (0); 353 } 354 355 int 356 mvcopy(char *from, char *to) 357 { 358 char *argv[3]; 359 360 argv[0] = from; 361 argv[1] = to; 362 argv[2] = NULL; 363 if (cpmain(2, argv)) { 364 warn("cp failed"); 365 _exit(1); 366 } 367 368 argv[0] = from; 369 argv[1] = NULL; 370 if (rmmain(1, argv)) { 371 warn("rm failed"); 372 _exit(1); 373 } 374 375 /* 376 * XXX 377 * The external cpmain(), rmmain() approach (to avoid 378 * fork+exec) hides some of the details on what was moved. 379 * This can be improved upon during a refactor. 380 */ 381 if (vflg) 382 (void)fprintf(stdout, "%s -> %s\n", from, to); 383 384 return (0); 385 } 386 387 void 388 usage(void) 389 { 390 (void)fprintf(stderr, "usage: %s [-fiv] source target\n", __progname); 391 (void)fprintf(stderr, " %s [-fiv] source ... directory\n", 392 __progname); 393 exit(1); 394 } 395