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 * 4. 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 #ifndef lint 31 #if 0 32 static char sccsid[] = "@(#)utils.c 8.3 (Berkeley) 4/1/94"; 33 #endif 34 #endif /* not lint */ 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include <sys/types.h> 39 #include <sys/acl.h> 40 #include <sys/param.h> 41 #include <sys/stat.h> 42 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 43 #include <sys/mman.h> 44 #endif 45 46 #include <err.h> 47 #include <errno.h> 48 #include <fcntl.h> 49 #include <fts.h> 50 #include <limits.h> 51 #include <stdio.h> 52 #include <stdlib.h> 53 #include <sysexits.h> 54 #include <unistd.h> 55 56 #include "extern.h" 57 58 #define cp_pct(x, y) ((y == 0) ? 0 : (int)(100.0 * (x) / (y))) 59 60 /* Memory strategy threshold, in pages: if physmem is larger then this, use a 61 * large buffer */ 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 /* Small (default) buffer size in bytes. It's inefficient for this to be 68 * smaller than MAXPHYS */ 69 #define BUFSIZE_SMALL (MAXPHYS) 70 71 int 72 copy_file(const FTSENT *entp, int dne) 73 { 74 static char *buf = NULL; 75 static size_t bufsize; 76 struct stat *fs; 77 ssize_t wcount; 78 size_t wresid; 79 off_t wtotal; 80 int ch, checkch, from_fd = 0, rcount, rval, to_fd = 0; 81 char *bufp; 82 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 83 char *p; 84 #endif 85 86 if ((from_fd = open(entp->fts_path, O_RDONLY, 0)) == -1) { 87 warn("%s", entp->fts_path); 88 return (1); 89 } 90 91 fs = entp->fts_statp; 92 93 /* 94 * If the file exists and we're interactive, verify with the user. 95 * If the file DNE, set the mode to be the from file, minus setuid 96 * bits, modified by the umask; arguably wrong, but it makes copying 97 * executables work right and it's been that way forever. (The 98 * other choice is 666 or'ed with the execute bits on the from file 99 * modified by the umask.) 100 */ 101 if (!dne) { 102 #define YESNO "(y/n [n]) " 103 if (nflag) { 104 if (vflag) 105 printf("%s not overwritten\n", to.p_path); 106 (void)close(from_fd); 107 return (1); 108 } else if (iflag) { 109 (void)fprintf(stderr, "overwrite %s? %s", 110 to.p_path, YESNO); 111 checkch = ch = getchar(); 112 while (ch != '\n' && ch != EOF) 113 ch = getchar(); 114 if (checkch != 'y' && checkch != 'Y') { 115 (void)close(from_fd); 116 (void)fprintf(stderr, "not overwritten\n"); 117 return (1); 118 } 119 } 120 121 if (fflag) { 122 /* remove existing destination file name, 123 * create a new file */ 124 (void)unlink(to.p_path); 125 if (!lflag) 126 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 127 fs->st_mode & ~(S_ISUID | S_ISGID)); 128 } else { 129 if (!lflag) 130 /* overwrite existing destination file name */ 131 to_fd = open(to.p_path, O_WRONLY | O_TRUNC, 0); 132 } 133 } else { 134 if (!lflag) 135 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 136 fs->st_mode & ~(S_ISUID | S_ISGID)); 137 } 138 139 if (to_fd == -1) { 140 warn("%s", to.p_path); 141 (void)close(from_fd); 142 return (1); 143 } 144 145 rval = 0; 146 147 if (!lflag) { 148 /* 149 * Mmap and write if less than 8M (the limit is so we don't totally 150 * trash memory on big files. This is really a minor hack, but it 151 * wins some CPU back. 152 * Some filesystems, such as smbnetfs, don't support mmap, 153 * so this is a best-effort attempt. 154 */ 155 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 156 if (S_ISREG(fs->st_mode) && fs->st_size > 0 && 157 fs->st_size <= 8 * 1024 * 1024 && 158 (p = mmap(NULL, (size_t)fs->st_size, PROT_READ, 159 MAP_SHARED, from_fd, (off_t)0)) != MAP_FAILED) { 160 wtotal = 0; 161 for (bufp = p, wresid = fs->st_size; ; 162 bufp += wcount, wresid -= (size_t)wcount) { 163 wcount = write(to_fd, bufp, wresid); 164 if (wcount <= 0) 165 break; 166 wtotal += wcount; 167 if (info) { 168 info = 0; 169 (void)fprintf(stderr, 170 "%s -> %s %3d%%\n", 171 entp->fts_path, to.p_path, 172 cp_pct(wtotal, fs->st_size)); 173 } 174 if (wcount >= (ssize_t)wresid) 175 break; 176 } 177 if (wcount != (ssize_t)wresid) { 178 warn("%s", to.p_path); 179 rval = 1; 180 } 181 /* Some systems don't unmap on close(2). */ 182 if (munmap(p, fs->st_size) < 0) { 183 warn("%s", entp->fts_path); 184 rval = 1; 185 } 186 } else 187 #endif 188 { 189 if (buf == NULL) { 190 /* 191 * Note that buf and bufsize are static. If 192 * malloc() fails, it will fail at the start 193 * and not copy only some files. 194 */ 195 if (sysconf(_SC_PHYS_PAGES) > 196 PHYSPAGES_THRESHOLD) 197 bufsize = MIN(BUFSIZE_MAX, MAXPHYS * 8); 198 else 199 bufsize = BUFSIZE_SMALL; 200 buf = malloc(bufsize); 201 if (buf == NULL) 202 err(1, "Not enough memory"); 203 } 204 wtotal = 0; 205 while ((rcount = read(from_fd, buf, bufsize)) > 0) { 206 for (bufp = buf, wresid = rcount; ; 207 bufp += wcount, wresid -= wcount) { 208 wcount = write(to_fd, bufp, wresid); 209 if (wcount <= 0) 210 break; 211 wtotal += wcount; 212 if (info) { 213 info = 0; 214 (void)fprintf(stderr, 215 "%s -> %s %3d%%\n", 216 entp->fts_path, to.p_path, 217 cp_pct(wtotal, fs->st_size)); 218 } 219 if (wcount >= (ssize_t)wresid) 220 break; 221 } 222 if (wcount != (ssize_t)wresid) { 223 warn("%s", to.p_path); 224 rval = 1; 225 break; 226 } 227 } 228 if (rcount < 0) { 229 warn("%s", entp->fts_path); 230 rval = 1; 231 } 232 } 233 } else { 234 if (link(entp->fts_path, to.p_path)) { 235 warn("%s", to.p_path); 236 rval = 1; 237 } 238 } 239 240 /* 241 * Don't remove the target even after an error. The target might 242 * not be a regular file, or its attributes might be important, 243 * or its contents might be irreplaceable. It would only be safe 244 * to remove it if we created it and its length is 0. 245 */ 246 247 if (!lflag) { 248 if (pflag && setfile(fs, to_fd)) 249 rval = 1; 250 if (pflag && preserve_fd_acls(from_fd, to_fd) != 0) 251 rval = 1; 252 if (close(to_fd)) { 253 warn("%s", to.p_path); 254 rval = 1; 255 } 256 } 257 258 (void)close(from_fd); 259 260 return (rval); 261 } 262 263 int 264 copy_link(const FTSENT *p, int exists) 265 { 266 int len; 267 char llink[PATH_MAX]; 268 269 if (exists && nflag) { 270 if (vflag) 271 printf("%s not overwritten\n", to.p_path); 272 return (1); 273 } 274 if ((len = readlink(p->fts_path, llink, sizeof(llink) - 1)) == -1) { 275 warn("readlink: %s", p->fts_path); 276 return (1); 277 } 278 llink[len] = '\0'; 279 if (exists && unlink(to.p_path)) { 280 warn("unlink: %s", to.p_path); 281 return (1); 282 } 283 if (symlink(llink, to.p_path)) { 284 warn("symlink: %s", llink); 285 return (1); 286 } 287 return (pflag ? setfile(p->fts_statp, -1) : 0); 288 } 289 290 int 291 copy_fifo(struct stat *from_stat, int exists) 292 { 293 294 if (exists && nflag) { 295 if (vflag) 296 printf("%s not overwritten\n", to.p_path); 297 return (1); 298 } 299 if (exists && unlink(to.p_path)) { 300 warn("unlink: %s", to.p_path); 301 return (1); 302 } 303 if (mkfifo(to.p_path, from_stat->st_mode)) { 304 warn("mkfifo: %s", to.p_path); 305 return (1); 306 } 307 return (pflag ? setfile(from_stat, -1) : 0); 308 } 309 310 int 311 copy_special(struct stat *from_stat, int exists) 312 { 313 314 if (exists && nflag) { 315 if (vflag) 316 printf("%s not overwritten\n", to.p_path); 317 return (1); 318 } 319 if (exists && unlink(to.p_path)) { 320 warn("unlink: %s", to.p_path); 321 return (1); 322 } 323 if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) { 324 warn("mknod: %s", to.p_path); 325 return (1); 326 } 327 return (pflag ? setfile(from_stat, -1) : 0); 328 } 329 330 int 331 setfile(struct stat *fs, int fd) 332 { 333 static struct timeval tv[2]; 334 struct stat ts; 335 int rval, gotstat, islink, fdval; 336 337 rval = 0; 338 fdval = fd != -1; 339 islink = !fdval && S_ISLNK(fs->st_mode); 340 fs->st_mode &= S_ISUID | S_ISGID | S_ISVTX | 341 S_IRWXU | S_IRWXG | S_IRWXO; 342 343 TIMESPEC_TO_TIMEVAL(&tv[0], &fs->st_atim); 344 TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtim); 345 if (islink ? lutimes(to.p_path, tv) : utimes(to.p_path, tv)) { 346 warn("%sutimes: %s", islink ? "l" : "", to.p_path); 347 rval = 1; 348 } 349 if (fdval ? fstat(fd, &ts) : 350 (islink ? lstat(to.p_path, &ts) : stat(to.p_path, &ts))) 351 gotstat = 0; 352 else { 353 gotstat = 1; 354 ts.st_mode &= S_ISUID | S_ISGID | S_ISVTX | 355 S_IRWXU | S_IRWXG | S_IRWXO; 356 } 357 /* 358 * Changing the ownership probably won't succeed, unless we're root 359 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting 360 * the mode; current BSD behavior is to remove all setuid bits on 361 * chown. If chown fails, lose setuid/setgid bits. 362 */ 363 if (!gotstat || fs->st_uid != ts.st_uid || fs->st_gid != ts.st_gid) 364 if (fdval ? fchown(fd, fs->st_uid, fs->st_gid) : 365 (islink ? lchown(to.p_path, fs->st_uid, fs->st_gid) : 366 chown(to.p_path, fs->st_uid, fs->st_gid))) { 367 if (errno != EPERM) { 368 warn("chown: %s", to.p_path); 369 rval = 1; 370 } 371 fs->st_mode &= ~(S_ISUID | S_ISGID); 372 } 373 374 if (!gotstat || fs->st_mode != ts.st_mode) 375 if (fdval ? fchmod(fd, fs->st_mode) : 376 (islink ? lchmod(to.p_path, fs->st_mode) : 377 chmod(to.p_path, fs->st_mode))) { 378 warn("chmod: %s", to.p_path); 379 rval = 1; 380 } 381 382 if (!gotstat || fs->st_flags != ts.st_flags) 383 if (fdval ? 384 fchflags(fd, fs->st_flags) : 385 (islink ? lchflags(to.p_path, fs->st_flags) : 386 chflags(to.p_path, fs->st_flags))) { 387 warn("chflags: %s", to.p_path); 388 rval = 1; 389 } 390 391 return (rval); 392 } 393 394 int 395 preserve_fd_acls(int source_fd, int dest_fd) 396 { 397 acl_t acl; 398 acl_type_t acl_type; 399 int acl_supported = 0, ret, trivial; 400 401 ret = fpathconf(source_fd, _PC_ACL_NFS4); 402 if (ret > 0 ) { 403 acl_supported = 1; 404 acl_type = ACL_TYPE_NFS4; 405 } else if (ret < 0 && errno != EINVAL) { 406 warn("fpathconf(..., _PC_ACL_NFS4) failed for %s", to.p_path); 407 return (1); 408 } 409 if (acl_supported == 0) { 410 ret = fpathconf(source_fd, _PC_ACL_EXTENDED); 411 if (ret > 0 ) { 412 acl_supported = 1; 413 acl_type = ACL_TYPE_ACCESS; 414 } else if (ret < 0 && errno != EINVAL) { 415 warn("fpathconf(..., _PC_ACL_EXTENDED) failed for %s", 416 to.p_path); 417 return (1); 418 } 419 } 420 if (acl_supported == 0) 421 return (0); 422 423 acl = acl_get_fd_np(source_fd, acl_type); 424 if (acl == NULL) { 425 warn("failed to get acl entries while setting %s", to.p_path); 426 return (1); 427 } 428 if (acl_is_trivial_np(acl, &trivial)) { 429 warn("acl_is_trivial() failed for %s", to.p_path); 430 acl_free(acl); 431 return (1); 432 } 433 if (trivial) { 434 acl_free(acl); 435 return (0); 436 } 437 if (acl_set_fd_np(dest_fd, acl, acl_type) < 0) { 438 warn("failed to set acl entries for %s", to.p_path); 439 acl_free(acl); 440 return (1); 441 } 442 acl_free(acl); 443 return (0); 444 } 445 446 int 447 preserve_dir_acls(struct stat *fs, char *source_dir, char *dest_dir) 448 { 449 acl_t (*aclgetf)(const char *, acl_type_t); 450 int (*aclsetf)(const char *, acl_type_t, acl_t); 451 struct acl *aclp; 452 acl_t acl; 453 acl_type_t acl_type; 454 int acl_supported = 0, ret, trivial; 455 456 ret = pathconf(source_dir, _PC_ACL_NFS4); 457 if (ret > 0) { 458 acl_supported = 1; 459 acl_type = ACL_TYPE_NFS4; 460 } else if (ret < 0 && errno != EINVAL) { 461 warn("fpathconf(..., _PC_ACL_NFS4) failed for %s", source_dir); 462 return (1); 463 } 464 if (acl_supported == 0) { 465 ret = pathconf(source_dir, _PC_ACL_EXTENDED); 466 if (ret > 0) { 467 acl_supported = 1; 468 acl_type = ACL_TYPE_ACCESS; 469 } else if (ret < 0 && errno != EINVAL) { 470 warn("fpathconf(..., _PC_ACL_EXTENDED) failed for %s", 471 source_dir); 472 return (1); 473 } 474 } 475 if (acl_supported == 0) 476 return (0); 477 478 /* 479 * If the file is a link we will not follow it 480 */ 481 if (S_ISLNK(fs->st_mode)) { 482 aclgetf = acl_get_link_np; 483 aclsetf = acl_set_link_np; 484 } else { 485 aclgetf = acl_get_file; 486 aclsetf = acl_set_file; 487 } 488 if (acl_type == ACL_TYPE_ACCESS) { 489 /* 490 * Even if there is no ACL_TYPE_DEFAULT entry here, a zero 491 * size ACL will be returned. So it is not safe to simply 492 * check the pointer to see if the default ACL is present. 493 */ 494 acl = aclgetf(source_dir, ACL_TYPE_DEFAULT); 495 if (acl == NULL) { 496 warn("failed to get default acl entries on %s", 497 source_dir); 498 return (1); 499 } 500 aclp = &acl->ats_acl; 501 if (aclp->acl_cnt != 0 && aclsetf(dest_dir, 502 ACL_TYPE_DEFAULT, acl) < 0) { 503 warn("failed to set default acl entries on %s", 504 dest_dir); 505 acl_free(acl); 506 return (1); 507 } 508 acl_free(acl); 509 } 510 acl = aclgetf(source_dir, acl_type); 511 if (acl == NULL) { 512 warn("failed to get acl entries on %s", source_dir); 513 return (1); 514 } 515 if (acl_is_trivial_np(acl, &trivial)) { 516 warn("acl_is_trivial() failed on %s", source_dir); 517 acl_free(acl); 518 return (1); 519 } 520 if (trivial) { 521 acl_free(acl); 522 return (0); 523 } 524 if (aclsetf(dest_dir, acl_type, acl) < 0) { 525 warn("failed to set acl entries on %s", dest_dir); 526 acl_free(acl); 527 return (1); 528 } 529 acl_free(acl); 530 return (0); 531 } 532 533 void 534 usage(void) 535 { 536 537 (void)fprintf(stderr, "%s\n%s\n", 538 "usage: cp [-R [-H | -L | -P]] [-f | -i | -n] [-alpvx] source_file target_file", 539 " cp [-R [-H | -L | -P]] [-f | -i | -n] [-alpvx] source_file ... " 540 "target_directory"); 541 exit(EX_USAGE); 542 } 543