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 int 61 copy_file(const FTSENT *entp, int dne) 62 { 63 static char buf[MAXBSIZE]; 64 struct stat *fs; 65 ssize_t wcount; 66 size_t wresid; 67 off_t wtotal; 68 int ch, checkch, from_fd = 0, rcount, rval, to_fd = 0; 69 char *bufp; 70 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 71 char *p; 72 #endif 73 74 if ((from_fd = open(entp->fts_path, O_RDONLY, 0)) == -1) { 75 warn("%s", entp->fts_path); 76 return (1); 77 } 78 79 fs = entp->fts_statp; 80 81 /* 82 * If the file exists and we're interactive, verify with the user. 83 * If the file DNE, set the mode to be the from file, minus setuid 84 * bits, modified by the umask; arguably wrong, but it makes copying 85 * executables work right and it's been that way forever. (The 86 * other choice is 666 or'ed with the execute bits on the from file 87 * modified by the umask.) 88 */ 89 if (!dne) { 90 #define YESNO "(y/n [n]) " 91 if (nflag) { 92 if (vflag) 93 printf("%s not overwritten\n", to.p_path); 94 (void)close(from_fd); 95 return (0); 96 } else if (iflag) { 97 (void)fprintf(stderr, "overwrite %s? %s", 98 to.p_path, YESNO); 99 checkch = ch = getchar(); 100 while (ch != '\n' && ch != EOF) 101 ch = getchar(); 102 if (checkch != 'y' && checkch != 'Y') { 103 (void)close(from_fd); 104 (void)fprintf(stderr, "not overwritten\n"); 105 return (1); 106 } 107 } 108 109 if (fflag) { 110 /* remove existing destination file name, 111 * create a new file */ 112 (void)unlink(to.p_path); 113 if (!lflag) 114 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 115 fs->st_mode & ~(S_ISUID | S_ISGID)); 116 } else { 117 if (!lflag) 118 /* overwrite existing destination file name */ 119 to_fd = open(to.p_path, O_WRONLY | O_TRUNC, 0); 120 } 121 } else { 122 if (!lflag) 123 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 124 fs->st_mode & ~(S_ISUID | S_ISGID)); 125 } 126 127 if (to_fd == -1) { 128 warn("%s", to.p_path); 129 (void)close(from_fd); 130 return (1); 131 } 132 133 rval = 0; 134 135 if (!lflag) { 136 /* 137 * Mmap and write if less than 8M (the limit is so we don't totally 138 * trash memory on big files. This is really a minor hack, but it 139 * wins some CPU back. 140 * Some filesystems, such as smbnetfs, don't support mmap, 141 * so this is a best-effort attempt. 142 */ 143 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 144 if (S_ISREG(fs->st_mode) && fs->st_size > 0 && 145 fs->st_size <= 8 * 1024 * 1024 && 146 (p = mmap(NULL, (size_t)fs->st_size, PROT_READ, 147 MAP_SHARED, from_fd, (off_t)0)) != MAP_FAILED) { 148 wtotal = 0; 149 for (bufp = p, wresid = fs->st_size; ; 150 bufp += wcount, wresid -= (size_t)wcount) { 151 wcount = write(to_fd, bufp, wresid); 152 if (wcount <= 0) 153 break; 154 wtotal += wcount; 155 if (info) { 156 info = 0; 157 (void)fprintf(stderr, 158 "%s -> %s %3d%%\n", 159 entp->fts_path, to.p_path, 160 cp_pct(wtotal, fs->st_size)); 161 } 162 if (wcount >= (ssize_t)wresid) 163 break; 164 } 165 if (wcount != (ssize_t)wresid) { 166 warn("%s", to.p_path); 167 rval = 1; 168 } 169 /* Some systems don't unmap on close(2). */ 170 if (munmap(p, fs->st_size) < 0) { 171 warn("%s", entp->fts_path); 172 rval = 1; 173 } 174 } else 175 #endif 176 { 177 wtotal = 0; 178 while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) { 179 for (bufp = buf, wresid = rcount; ; 180 bufp += wcount, wresid -= wcount) { 181 wcount = write(to_fd, bufp, wresid); 182 if (wcount <= 0) 183 break; 184 wtotal += wcount; 185 if (info) { 186 info = 0; 187 (void)fprintf(stderr, 188 "%s -> %s %3d%%\n", 189 entp->fts_path, to.p_path, 190 cp_pct(wtotal, fs->st_size)); 191 } 192 if (wcount >= (ssize_t)wresid) 193 break; 194 } 195 if (wcount != (ssize_t)wresid) { 196 warn("%s", to.p_path); 197 rval = 1; 198 break; 199 } 200 } 201 if (rcount < 0) { 202 warn("%s", entp->fts_path); 203 rval = 1; 204 } 205 } 206 } else { 207 if (link(entp->fts_path, to.p_path)) { 208 warn("%s", to.p_path); 209 rval = 1; 210 } 211 } 212 213 /* 214 * Don't remove the target even after an error. The target might 215 * not be a regular file, or its attributes might be important, 216 * or its contents might be irreplaceable. It would only be safe 217 * to remove it if we created it and its length is 0. 218 */ 219 220 if (!lflag) { 221 if (pflag && setfile(fs, to_fd)) 222 rval = 1; 223 if (pflag && preserve_fd_acls(from_fd, to_fd) != 0) 224 rval = 1; 225 if (close(to_fd)) { 226 warn("%s", to.p_path); 227 rval = 1; 228 } 229 } 230 231 (void)close(from_fd); 232 233 return (rval); 234 } 235 236 int 237 copy_link(const FTSENT *p, int exists) 238 { 239 int len; 240 char llink[PATH_MAX]; 241 242 if ((len = readlink(p->fts_path, llink, sizeof(llink) - 1)) == -1) { 243 warn("readlink: %s", p->fts_path); 244 return (1); 245 } 246 llink[len] = '\0'; 247 if (exists && unlink(to.p_path)) { 248 warn("unlink: %s", to.p_path); 249 return (1); 250 } 251 if (symlink(llink, to.p_path)) { 252 warn("symlink: %s", llink); 253 return (1); 254 } 255 return (pflag ? setfile(p->fts_statp, -1) : 0); 256 } 257 258 int 259 copy_fifo(struct stat *from_stat, int exists) 260 { 261 if (exists && unlink(to.p_path)) { 262 warn("unlink: %s", to.p_path); 263 return (1); 264 } 265 if (mkfifo(to.p_path, from_stat->st_mode)) { 266 warn("mkfifo: %s", to.p_path); 267 return (1); 268 } 269 return (pflag ? setfile(from_stat, -1) : 0); 270 } 271 272 int 273 copy_special(struct stat *from_stat, int exists) 274 { 275 if (exists && unlink(to.p_path)) { 276 warn("unlink: %s", to.p_path); 277 return (1); 278 } 279 if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) { 280 warn("mknod: %s", to.p_path); 281 return (1); 282 } 283 return (pflag ? setfile(from_stat, -1) : 0); 284 } 285 286 int 287 setfile(struct stat *fs, int fd) 288 { 289 static struct timeval tv[2]; 290 struct stat ts; 291 int rval, gotstat, islink, fdval; 292 293 rval = 0; 294 fdval = fd != -1; 295 islink = !fdval && S_ISLNK(fs->st_mode); 296 fs->st_mode &= S_ISUID | S_ISGID | S_ISVTX | 297 S_IRWXU | S_IRWXG | S_IRWXO; 298 299 TIMESPEC_TO_TIMEVAL(&tv[0], &fs->st_atimespec); 300 TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtimespec); 301 if (islink ? lutimes(to.p_path, tv) : utimes(to.p_path, tv)) { 302 warn("%sutimes: %s", islink ? "l" : "", to.p_path); 303 rval = 1; 304 } 305 if (fdval ? fstat(fd, &ts) : 306 (islink ? lstat(to.p_path, &ts) : stat(to.p_path, &ts))) 307 gotstat = 0; 308 else { 309 gotstat = 1; 310 ts.st_mode &= S_ISUID | S_ISGID | S_ISVTX | 311 S_IRWXU | S_IRWXG | S_IRWXO; 312 } 313 /* 314 * Changing the ownership probably won't succeed, unless we're root 315 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting 316 * the mode; current BSD behavior is to remove all setuid bits on 317 * chown. If chown fails, lose setuid/setgid bits. 318 */ 319 if (!gotstat || fs->st_uid != ts.st_uid || fs->st_gid != ts.st_gid) 320 if (fdval ? fchown(fd, fs->st_uid, fs->st_gid) : 321 (islink ? lchown(to.p_path, fs->st_uid, fs->st_gid) : 322 chown(to.p_path, fs->st_uid, fs->st_gid))) { 323 if (errno != EPERM) { 324 warn("chown: %s", to.p_path); 325 rval = 1; 326 } 327 fs->st_mode &= ~(S_ISUID | S_ISGID); 328 } 329 330 if (!gotstat || fs->st_mode != ts.st_mode) 331 if (fdval ? fchmod(fd, fs->st_mode) : 332 (islink ? lchmod(to.p_path, fs->st_mode) : 333 chmod(to.p_path, fs->st_mode))) { 334 warn("chmod: %s", to.p_path); 335 rval = 1; 336 } 337 338 if (!gotstat || fs->st_flags != ts.st_flags) 339 if (fdval ? 340 fchflags(fd, fs->st_flags) : 341 (islink ? (errno = ENOSYS) : 342 chflags(to.p_path, fs->st_flags))) { 343 warn("chflags: %s", to.p_path); 344 rval = 1; 345 } 346 347 return (rval); 348 } 349 350 int 351 preserve_fd_acls(int source_fd, int dest_fd) 352 { 353 struct acl *aclp; 354 acl_t acl; 355 356 if (fpathconf(source_fd, _PC_ACL_EXTENDED) != 1 || 357 fpathconf(dest_fd, _PC_ACL_EXTENDED) != 1) 358 return (0); 359 acl = acl_get_fd(source_fd); 360 if (acl == NULL) { 361 warn("failed to get acl entries while setting %s", to.p_path); 362 return (1); 363 } 364 aclp = &acl->ats_acl; 365 if (aclp->acl_cnt == 3) 366 return (0); 367 if (acl_set_fd(dest_fd, acl) < 0) { 368 warn("failed to set acl entries for %s", to.p_path); 369 return (1); 370 } 371 return (0); 372 } 373 374 int 375 preserve_dir_acls(struct stat *fs, char *source_dir, char *dest_dir) 376 { 377 acl_t (*aclgetf)(const char *, acl_type_t); 378 int (*aclsetf)(const char *, acl_type_t, acl_t); 379 struct acl *aclp; 380 acl_t acl; 381 382 if (pathconf(source_dir, _PC_ACL_EXTENDED) != 1 || 383 pathconf(dest_dir, _PC_ACL_EXTENDED) != 1) 384 return (0); 385 /* 386 * If the file is a link we will not follow it 387 */ 388 if (S_ISLNK(fs->st_mode)) { 389 aclgetf = acl_get_link_np; 390 aclsetf = acl_set_link_np; 391 } else { 392 aclgetf = acl_get_file; 393 aclsetf = acl_set_file; 394 } 395 /* 396 * Even if there is no ACL_TYPE_DEFAULT entry here, a zero 397 * size ACL will be returned. So it is not safe to simply 398 * check the pointer to see if the default ACL is present. 399 */ 400 acl = aclgetf(source_dir, ACL_TYPE_DEFAULT); 401 if (acl == NULL) { 402 warn("failed to get default acl entries on %s", 403 source_dir); 404 return (1); 405 } 406 aclp = &acl->ats_acl; 407 if (aclp->acl_cnt != 0 && aclsetf(dest_dir, 408 ACL_TYPE_DEFAULT, acl) < 0) { 409 warn("failed to set default acl entries on %s", 410 dest_dir); 411 return (1); 412 } 413 acl = aclgetf(source_dir, ACL_TYPE_ACCESS); 414 if (acl == NULL) { 415 warn("failed to get acl entries on %s", source_dir); 416 return (1); 417 } 418 aclp = &acl->ats_acl; 419 if (aclsetf(dest_dir, ACL_TYPE_ACCESS, acl) < 0) { 420 warn("failed to set acl entries on %s", dest_dir); 421 return (1); 422 } 423 return (0); 424 } 425 426 void 427 usage(void) 428 { 429 430 (void)fprintf(stderr, "%s\n%s\n", 431 "usage: cp [-R [-H | -L | -P]] [-f | -i | -n] [-alpv] source_file target_file", 432 " cp [-R [-H | -L | -P]] [-f | -i | -n] [-alpv] source_file ... " 433 "target_directory"); 434 exit(EX_USAGE); 435 } 436