1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1991, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #ifndef lint 33 #if 0 34 static char sccsid[] = "@(#)utils.c 8.3 (Berkeley) 4/1/94"; 35 #endif 36 #endif /* not lint */ 37 #include <sys/cdefs.h> 38 #include <sys/param.h> 39 #include <sys/acl.h> 40 #include <sys/stat.h> 41 42 #include <err.h> 43 #include <errno.h> 44 #include <fcntl.h> 45 #include <fts.h> 46 #include <limits.h> 47 #include <stdio.h> 48 #include <stdlib.h> 49 #include <sysexits.h> 50 #include <unistd.h> 51 52 #include "extern.h" 53 54 #define cp_pct(x, y) ((y == 0) ? 0 : (int)(100.0 * (x) / (y))) 55 56 /* 57 * Memory strategy threshold, in pages: if physmem is larger then this, use a 58 * large buffer. 59 */ 60 #define PHYSPAGES_THRESHOLD (32*1024) 61 62 /* Maximum buffer size in bytes - do not allow it to grow larger than this. */ 63 #define BUFSIZE_MAX (2*1024*1024) 64 65 /* 66 * Small (default) buffer size in bytes. It's inefficient for this to be 67 * smaller than MAXPHYS. 68 */ 69 #define BUFSIZE_SMALL (MAXPHYS) 70 71 /* 72 * Prompt used in -i case. 73 */ 74 #define YESNO "(y/n [n]) " 75 76 static ssize_t 77 copy_fallback(int from_fd, int to_fd) 78 { 79 static char *buf = NULL; 80 static size_t bufsize; 81 ssize_t rcount, wresid, wcount = 0; 82 char *bufp; 83 84 if (buf == NULL) { 85 if (sysconf(_SC_PHYS_PAGES) > PHYSPAGES_THRESHOLD) 86 bufsize = MIN(BUFSIZE_MAX, MAXPHYS * 8); 87 else 88 bufsize = BUFSIZE_SMALL; 89 buf = malloc(bufsize); 90 if (buf == NULL) 91 err(1, "Not enough memory"); 92 } 93 rcount = read(from_fd, buf, bufsize); 94 if (rcount <= 0) 95 return (rcount); 96 for (bufp = buf, wresid = rcount; ; bufp += wcount, wresid -= wcount) { 97 wcount = write(to_fd, bufp, wresid); 98 if (wcount <= 0) 99 break; 100 if (wcount >= (ssize_t)wresid) 101 break; 102 } 103 return (wcount < 0 ? wcount : rcount); 104 } 105 106 int 107 copy_file(const FTSENT *entp, int dne) 108 { 109 struct stat *fs; 110 ssize_t wcount; 111 off_t wtotal; 112 int ch, checkch, from_fd, rval, to_fd; 113 int use_copy_file_range = 1; 114 115 from_fd = to_fd = -1; 116 if (!lflag && !sflag && 117 (from_fd = open(entp->fts_path, O_RDONLY, 0)) == -1) { 118 warn("%s", entp->fts_path); 119 return (1); 120 } 121 122 fs = entp->fts_statp; 123 124 /* 125 * If the file exists and we're interactive, verify with the user. 126 * If the file DNE, set the mode to be the from file, minus setuid 127 * bits, modified by the umask; arguably wrong, but it makes copying 128 * executables work right and it's been that way forever. (The 129 * other choice is 666 or'ed with the execute bits on the from file 130 * modified by the umask.) 131 */ 132 if (!dne) { 133 if (nflag) { 134 if (vflag) 135 printf("%s not overwritten\n", to.p_path); 136 rval = 1; 137 goto done; 138 } else if (iflag) { 139 (void)fprintf(stderr, "overwrite %s? %s", 140 to.p_path, YESNO); 141 checkch = ch = getchar(); 142 while (ch != '\n' && ch != EOF) 143 ch = getchar(); 144 if (checkch != 'y' && checkch != 'Y') { 145 (void)fprintf(stderr, "not overwritten\n"); 146 rval = 1; 147 goto done; 148 } 149 } 150 151 if (fflag) { 152 /* remove existing destination file */ 153 (void)unlink(to.p_path); 154 dne = 1; 155 } 156 } 157 158 rval = 0; 159 160 if (lflag) { 161 if (link(entp->fts_path, to.p_path) != 0) { 162 warn("%s", to.p_path); 163 rval = 1; 164 } 165 goto done; 166 } 167 168 if (sflag) { 169 if (symlink(entp->fts_path, to.p_path) != 0) { 170 warn("%s", to.p_path); 171 rval = 1; 172 } 173 goto done; 174 } 175 176 if (!dne) { 177 /* overwrite existing destination file */ 178 to_fd = open(to.p_path, O_WRONLY | O_TRUNC, 0); 179 } else { 180 /* create new destination file */ 181 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 182 fs->st_mode & ~(S_ISUID | S_ISGID)); 183 } 184 if (to_fd == -1) { 185 warn("%s", to.p_path); 186 rval = 1; 187 goto done; 188 } 189 190 wtotal = 0; 191 do { 192 if (use_copy_file_range) { 193 wcount = copy_file_range(from_fd, NULL, 194 to_fd, NULL, SSIZE_MAX, 0); 195 if (wcount < 0 && errno == EINVAL) { 196 /* probably a non-seekable descriptor */ 197 use_copy_file_range = 0; 198 } 199 } 200 if (!use_copy_file_range) { 201 wcount = copy_fallback(from_fd, to_fd); 202 } 203 wtotal += wcount; 204 if (info) { 205 info = 0; 206 (void)fprintf(stderr, 207 "%s -> %s %3d%%\n", 208 entp->fts_path, to.p_path, 209 cp_pct(wtotal, fs->st_size)); 210 } 211 } while (wcount > 0); 212 if (wcount < 0) { 213 warn("%s", entp->fts_path); 214 rval = 1; 215 } 216 217 /* 218 * Don't remove the target even after an error. The target might 219 * not be a regular file, or its attributes might be important, 220 * or its contents might be irreplaceable. It would only be safe 221 * to remove it if we created it and its length is 0. 222 */ 223 if (pflag && setfile(fs, to_fd)) 224 rval = 1; 225 if (pflag && preserve_fd_acls(from_fd, to_fd) != 0) 226 rval = 1; 227 if (close(to_fd)) { 228 warn("%s", to.p_path); 229 rval = 1; 230 } 231 232 done: 233 if (from_fd != -1) 234 (void)close(from_fd); 235 return (rval); 236 } 237 238 int 239 copy_link(const FTSENT *p, int exists) 240 { 241 ssize_t len; 242 char llink[PATH_MAX]; 243 244 if (exists && nflag) { 245 if (vflag) 246 printf("%s not overwritten\n", to.p_path); 247 return (1); 248 } 249 if ((len = readlink(p->fts_path, llink, sizeof(llink) - 1)) == -1) { 250 warn("readlink: %s", p->fts_path); 251 return (1); 252 } 253 llink[len] = '\0'; 254 if (exists && unlink(to.p_path)) { 255 warn("unlink: %s", to.p_path); 256 return (1); 257 } 258 if (symlink(llink, to.p_path)) { 259 warn("symlink: %s", llink); 260 return (1); 261 } 262 return (pflag ? setfile(p->fts_statp, -1) : 0); 263 } 264 265 int 266 copy_fifo(struct stat *from_stat, int exists) 267 { 268 269 if (exists && nflag) { 270 if (vflag) 271 printf("%s not overwritten\n", to.p_path); 272 return (1); 273 } 274 if (exists && unlink(to.p_path)) { 275 warn("unlink: %s", to.p_path); 276 return (1); 277 } 278 if (mkfifo(to.p_path, from_stat->st_mode)) { 279 warn("mkfifo: %s", to.p_path); 280 return (1); 281 } 282 return (pflag ? setfile(from_stat, -1) : 0); 283 } 284 285 int 286 copy_special(struct stat *from_stat, int exists) 287 { 288 289 if (exists && nflag) { 290 if (vflag) 291 printf("%s not overwritten\n", to.p_path); 292 return (1); 293 } 294 if (exists && unlink(to.p_path)) { 295 warn("unlink: %s", to.p_path); 296 return (1); 297 } 298 if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) { 299 warn("mknod: %s", to.p_path); 300 return (1); 301 } 302 return (pflag ? setfile(from_stat, -1) : 0); 303 } 304 305 int 306 setfile(struct stat *fs, int fd) 307 { 308 static struct timespec tspec[2]; 309 struct stat ts; 310 int rval, gotstat, islink, fdval; 311 312 rval = 0; 313 fdval = fd != -1; 314 islink = !fdval && S_ISLNK(fs->st_mode); 315 fs->st_mode &= S_ISUID | S_ISGID | S_ISVTX | 316 S_IRWXU | S_IRWXG | S_IRWXO; 317 318 tspec[0] = fs->st_atim; 319 tspec[1] = fs->st_mtim; 320 if (fdval ? futimens(fd, tspec) : utimensat(AT_FDCWD, to.p_path, tspec, 321 islink ? AT_SYMLINK_NOFOLLOW : 0)) { 322 warn("utimensat: %s", to.p_path); 323 rval = 1; 324 } 325 if (fdval ? fstat(fd, &ts) : 326 (islink ? lstat(to.p_path, &ts) : stat(to.p_path, &ts))) 327 gotstat = 0; 328 else { 329 gotstat = 1; 330 ts.st_mode &= S_ISUID | S_ISGID | S_ISVTX | 331 S_IRWXU | S_IRWXG | S_IRWXO; 332 } 333 /* 334 * Changing the ownership probably won't succeed, unless we're root 335 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting 336 * the mode; current BSD behavior is to remove all setuid bits on 337 * chown. If chown fails, lose setuid/setgid bits. 338 */ 339 if (!gotstat || fs->st_uid != ts.st_uid || fs->st_gid != ts.st_gid) 340 if (fdval ? fchown(fd, fs->st_uid, fs->st_gid) : 341 (islink ? lchown(to.p_path, fs->st_uid, fs->st_gid) : 342 chown(to.p_path, fs->st_uid, fs->st_gid))) { 343 if (errno != EPERM) { 344 warn("chown: %s", to.p_path); 345 rval = 1; 346 } 347 fs->st_mode &= ~(S_ISUID | S_ISGID); 348 } 349 350 if (!gotstat || fs->st_mode != ts.st_mode) 351 if (fdval ? fchmod(fd, fs->st_mode) : 352 (islink ? lchmod(to.p_path, fs->st_mode) : 353 chmod(to.p_path, fs->st_mode))) { 354 warn("chmod: %s", to.p_path); 355 rval = 1; 356 } 357 358 if (!Nflag && (!gotstat || fs->st_flags != ts.st_flags)) 359 if (fdval ? 360 fchflags(fd, fs->st_flags) : 361 (islink ? lchflags(to.p_path, fs->st_flags) : 362 chflags(to.p_path, fs->st_flags))) { 363 /* 364 * NFS doesn't support chflags; ignore errors unless 365 * there's reason to believe we're losing bits. (Note, 366 * this still won't be right if the server supports 367 * flags and we were trying to *remove* flags on a file 368 * that we copied, i.e., that we didn't create.) 369 */ 370 if (errno != EOPNOTSUPP || fs->st_flags != 0) { 371 warn("chflags: %s", to.p_path); 372 rval = 1; 373 } 374 } 375 376 return (rval); 377 } 378 379 int 380 preserve_fd_acls(int source_fd, int dest_fd) 381 { 382 acl_t acl; 383 acl_type_t acl_type; 384 int acl_supported = 0, ret, trivial; 385 386 ret = fpathconf(source_fd, _PC_ACL_NFS4); 387 if (ret > 0 ) { 388 acl_supported = 1; 389 acl_type = ACL_TYPE_NFS4; 390 } else if (ret < 0 && errno != EINVAL) { 391 warn("fpathconf(..., _PC_ACL_NFS4) failed for %s", to.p_path); 392 return (1); 393 } 394 if (acl_supported == 0) { 395 ret = fpathconf(source_fd, _PC_ACL_EXTENDED); 396 if (ret > 0 ) { 397 acl_supported = 1; 398 acl_type = ACL_TYPE_ACCESS; 399 } else if (ret < 0 && errno != EINVAL) { 400 warn("fpathconf(..., _PC_ACL_EXTENDED) failed for %s", 401 to.p_path); 402 return (1); 403 } 404 } 405 if (acl_supported == 0) 406 return (0); 407 408 acl = acl_get_fd_np(source_fd, acl_type); 409 if (acl == NULL) { 410 warn("failed to get acl entries while setting %s", to.p_path); 411 return (1); 412 } 413 if (acl_is_trivial_np(acl, &trivial)) { 414 warn("acl_is_trivial() failed for %s", to.p_path); 415 acl_free(acl); 416 return (1); 417 } 418 if (trivial) { 419 acl_free(acl); 420 return (0); 421 } 422 if (acl_set_fd_np(dest_fd, acl, acl_type) < 0) { 423 warn("failed to set acl entries for %s", to.p_path); 424 acl_free(acl); 425 return (1); 426 } 427 acl_free(acl); 428 return (0); 429 } 430 431 int 432 preserve_dir_acls(struct stat *fs, char *source_dir, char *dest_dir) 433 { 434 acl_t (*aclgetf)(const char *, acl_type_t); 435 int (*aclsetf)(const char *, acl_type_t, acl_t); 436 struct acl *aclp; 437 acl_t acl; 438 acl_type_t acl_type; 439 int acl_supported = 0, ret, trivial; 440 441 ret = pathconf(source_dir, _PC_ACL_NFS4); 442 if (ret > 0) { 443 acl_supported = 1; 444 acl_type = ACL_TYPE_NFS4; 445 } else if (ret < 0 && errno != EINVAL) { 446 warn("fpathconf(..., _PC_ACL_NFS4) failed for %s", source_dir); 447 return (1); 448 } 449 if (acl_supported == 0) { 450 ret = pathconf(source_dir, _PC_ACL_EXTENDED); 451 if (ret > 0) { 452 acl_supported = 1; 453 acl_type = ACL_TYPE_ACCESS; 454 } else if (ret < 0 && errno != EINVAL) { 455 warn("fpathconf(..., _PC_ACL_EXTENDED) failed for %s", 456 source_dir); 457 return (1); 458 } 459 } 460 if (acl_supported == 0) 461 return (0); 462 463 /* 464 * If the file is a link we will not follow it. 465 */ 466 if (S_ISLNK(fs->st_mode)) { 467 aclgetf = acl_get_link_np; 468 aclsetf = acl_set_link_np; 469 } else { 470 aclgetf = acl_get_file; 471 aclsetf = acl_set_file; 472 } 473 if (acl_type == ACL_TYPE_ACCESS) { 474 /* 475 * Even if there is no ACL_TYPE_DEFAULT entry here, a zero 476 * size ACL will be returned. So it is not safe to simply 477 * check the pointer to see if the default ACL is present. 478 */ 479 acl = aclgetf(source_dir, ACL_TYPE_DEFAULT); 480 if (acl == NULL) { 481 warn("failed to get default acl entries on %s", 482 source_dir); 483 return (1); 484 } 485 aclp = &acl->ats_acl; 486 if (aclp->acl_cnt != 0 && aclsetf(dest_dir, 487 ACL_TYPE_DEFAULT, acl) < 0) { 488 warn("failed to set default acl entries on %s", 489 dest_dir); 490 acl_free(acl); 491 return (1); 492 } 493 acl_free(acl); 494 } 495 acl = aclgetf(source_dir, acl_type); 496 if (acl == NULL) { 497 warn("failed to get acl entries on %s", source_dir); 498 return (1); 499 } 500 if (acl_is_trivial_np(acl, &trivial)) { 501 warn("acl_is_trivial() failed on %s", source_dir); 502 acl_free(acl); 503 return (1); 504 } 505 if (trivial) { 506 acl_free(acl); 507 return (0); 508 } 509 if (aclsetf(dest_dir, acl_type, acl) < 0) { 510 warn("failed to set acl entries on %s", dest_dir); 511 acl_free(acl); 512 return (1); 513 } 514 acl_free(acl); 515 return (0); 516 } 517 518 void 519 usage(void) 520 { 521 522 (void)fprintf(stderr, "%s\n%s\n", 523 "usage: cp [-R [-H | -L | -P]] [-f | -i | -n] [-alpsvx] " 524 "source_file target_file", 525 " cp [-R [-H | -L | -P]] [-f | -i | -n] [-alpsvx] " 526 "source_file ... " 527 "target_directory"); 528 exit(EX_USAGE); 529 } 530