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