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 #define cp_pct(x,y) (int)(100.0 * (double)(x) / (double)(y)) 58 59 int 60 copy_file(const FTSENT *entp, int dne) 61 { 62 static char buf[MAXBSIZE]; 63 struct stat *fs; 64 int ch, checkch, from_fd, rcount, rval, to_fd; 65 ssize_t wcount; 66 size_t wresid; 67 size_t wtotal; 68 char *bufp; 69 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 70 char *p; 71 #endif 72 73 if ((from_fd = open(entp->fts_path, O_RDONLY, 0)) == -1) { 74 warn("%s", entp->fts_path); 75 return (1); 76 } 77 78 fs = entp->fts_statp; 79 80 /* 81 * If the file exists and we're interactive, verify with the user. 82 * If the file DNE, set the mode to be the from file, minus setuid 83 * bits, modified by the umask; arguably wrong, but it makes copying 84 * executables work right and it's been that way forever. (The 85 * other choice is 666 or'ed with the execute bits on the from file 86 * modified by the umask.) 87 */ 88 if (!dne) { 89 #define YESNO "(y/n [n]) " 90 if (nflag) { 91 if (vflag) 92 printf("%s not overwritten\n", to.p_path); 93 (void)close(from_fd); 94 return (0); 95 } else if (iflag) { 96 (void)fprintf(stderr, "overwrite %s? %s", 97 to.p_path, YESNO); 98 checkch = ch = getchar(); 99 while (ch != '\n' && ch != EOF) 100 ch = getchar(); 101 if (checkch != 'y' && checkch != 'Y') { 102 (void)close(from_fd); 103 (void)fprintf(stderr, "not overwritten\n"); 104 return (1); 105 } 106 } 107 108 if (fflag) { 109 /* remove existing destination file name, 110 * create a new file */ 111 (void)unlink(to.p_path); 112 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 113 fs->st_mode & ~(S_ISUID | S_ISGID)); 114 } else 115 /* overwrite existing destination file name */ 116 to_fd = open(to.p_path, O_WRONLY | O_TRUNC, 0); 117 } else 118 to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT, 119 fs->st_mode & ~(S_ISUID | S_ISGID)); 120 121 if (to_fd == -1) { 122 warn("%s", to.p_path); 123 (void)close(from_fd); 124 return (1); 125 } 126 127 rval = 0; 128 129 /* 130 * Mmap and write if less than 8M (the limit is so we don't totally 131 * trash memory on big files. This is really a minor hack, but it 132 * wins some CPU back. 133 */ 134 #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED 135 if (S_ISREG(fs->st_mode) && fs->st_size > 0 && 136 fs->st_size <= 8 * 1048576) { 137 if ((p = mmap(NULL, (size_t)fs->st_size, PROT_READ, 138 MAP_SHARED, from_fd, (off_t)0)) == MAP_FAILED) { 139 warn("%s", entp->fts_path); 140 rval = 1; 141 } else { 142 wtotal = 0; 143 for (bufp = p, wresid = fs->st_size; ; 144 bufp += wcount, wresid -= (size_t)wcount) { 145 wcount = write(to_fd, bufp, wresid); 146 wtotal += wcount; 147 if (info) { 148 info = 0; 149 (void)fprintf(stderr, 150 "%s -> %s %3d%%\n", 151 entp->fts_path, to.p_path, 152 cp_pct(wtotal, fs->st_size)); 153 154 } 155 if (wcount >= (ssize_t)wresid || wcount <= 0) 156 break; 157 } 158 if (wcount != (ssize_t)wresid) { 159 warn("%s", to.p_path); 160 rval = 1; 161 } 162 /* Some systems don't unmap on close(2). */ 163 if (munmap(p, fs->st_size) < 0) { 164 warn("%s", entp->fts_path); 165 rval = 1; 166 } 167 } 168 } else 169 #endif 170 { 171 wtotal = 0; 172 while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) { 173 for (bufp = buf, wresid = rcount; ; 174 bufp += wcount, wresid -= wcount) { 175 wcount = write(to_fd, bufp, wresid); 176 wtotal += wcount; 177 if (info) { 178 info = 0; 179 (void)fprintf(stderr, 180 "%s -> %s %3d%%\n", 181 entp->fts_path, to.p_path, 182 cp_pct(wtotal, fs->st_size)); 183 184 } 185 if (wcount >= (ssize_t)wresid || wcount <= 0) 186 break; 187 } 188 if (wcount != (ssize_t)wresid) { 189 warn("%s", to.p_path); 190 rval = 1; 191 break; 192 } 193 } 194 if (rcount < 0) { 195 warn("%s", entp->fts_path); 196 rval = 1; 197 } 198 } 199 200 /* 201 * Don't remove the target even after an error. The target might 202 * not be a regular file, or its attributes might be important, 203 * or its contents might be irreplaceable. It would only be safe 204 * to remove it if we created it and its length is 0. 205 */ 206 207 if (pflag && setfile(fs, to_fd)) 208 rval = 1; 209 if (pflag && preserve_fd_acls(from_fd, to_fd) != 0) 210 rval = 1; 211 (void)close(from_fd); 212 if (close(to_fd)) { 213 warn("%s", to.p_path); 214 rval = 1; 215 } 216 return (rval); 217 } 218 219 int 220 copy_link(const FTSENT *p, int exists) 221 { 222 int len; 223 char llink[PATH_MAX]; 224 225 if ((len = readlink(p->fts_path, llink, sizeof(llink) - 1)) == -1) { 226 warn("readlink: %s", p->fts_path); 227 return (1); 228 } 229 llink[len] = '\0'; 230 if (exists && unlink(to.p_path)) { 231 warn("unlink: %s", to.p_path); 232 return (1); 233 } 234 if (symlink(llink, to.p_path)) { 235 warn("symlink: %s", llink); 236 return (1); 237 } 238 return (pflag ? setfile(p->fts_statp, -1) : 0); 239 } 240 241 int 242 copy_fifo(struct stat *from_stat, int exists) 243 { 244 if (exists && unlink(to.p_path)) { 245 warn("unlink: %s", to.p_path); 246 return (1); 247 } 248 if (mkfifo(to.p_path, from_stat->st_mode)) { 249 warn("mkfifo: %s", to.p_path); 250 return (1); 251 } 252 return (pflag ? setfile(from_stat, -1) : 0); 253 } 254 255 int 256 copy_special(struct stat *from_stat, int exists) 257 { 258 if (exists && unlink(to.p_path)) { 259 warn("unlink: %s", to.p_path); 260 return (1); 261 } 262 if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) { 263 warn("mknod: %s", to.p_path); 264 return (1); 265 } 266 return (pflag ? setfile(from_stat, -1) : 0); 267 } 268 269 int 270 setfile(struct stat *fs, int fd) 271 { 272 static struct timeval tv[2]; 273 struct stat ts; 274 int rval, gotstat, islink, fdval; 275 276 rval = 0; 277 fdval = fd != -1; 278 islink = !fdval && S_ISLNK(fs->st_mode); 279 fs->st_mode &= S_ISUID | S_ISGID | S_ISVTX | 280 S_IRWXU | S_IRWXG | S_IRWXO; 281 282 TIMESPEC_TO_TIMEVAL(&tv[0], &fs->st_atimespec); 283 TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtimespec); 284 if (islink ? lutimes(to.p_path, tv) : utimes(to.p_path, tv)) { 285 warn("%sutimes: %s", islink ? "l" : "", to.p_path); 286 rval = 1; 287 } 288 if (fdval ? fstat(fd, &ts) : 289 (islink ? lstat(to.p_path, &ts) : stat(to.p_path, &ts))) 290 gotstat = 0; 291 else { 292 gotstat = 1; 293 ts.st_mode &= S_ISUID | S_ISGID | S_ISVTX | 294 S_IRWXU | S_IRWXG | S_IRWXO; 295 } 296 /* 297 * Changing the ownership probably won't succeed, unless we're root 298 * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting 299 * the mode; current BSD behavior is to remove all setuid bits on 300 * chown. If chown fails, lose setuid/setgid bits. 301 */ 302 if (!gotstat || fs->st_uid != ts.st_uid || fs->st_gid != ts.st_gid) 303 if (fdval ? fchown(fd, fs->st_uid, fs->st_gid) : 304 (islink ? lchown(to.p_path, fs->st_uid, fs->st_gid) : 305 chown(to.p_path, fs->st_uid, fs->st_gid))) { 306 if (errno != EPERM) { 307 warn("chown: %s", to.p_path); 308 rval = 1; 309 } 310 fs->st_mode &= ~(S_ISUID | S_ISGID); 311 } 312 313 if (!gotstat || fs->st_mode != ts.st_mode) 314 if (fdval ? fchmod(fd, fs->st_mode) : 315 (islink ? lchmod(to.p_path, fs->st_mode) : 316 chmod(to.p_path, fs->st_mode))) { 317 warn("chmod: %s", to.p_path); 318 rval = 1; 319 } 320 321 if (!gotstat || fs->st_flags != ts.st_flags) 322 if (fdval ? 323 fchflags(fd, fs->st_flags) : 324 (islink ? (errno = ENOSYS) : 325 chflags(to.p_path, fs->st_flags))) { 326 warn("chflags: %s", to.p_path); 327 rval = 1; 328 } 329 330 return (rval); 331 } 332 333 int 334 preserve_fd_acls(int source_fd, int dest_fd) 335 { 336 struct acl *aclp; 337 acl_t acl; 338 339 if (fpathconf(source_fd, _PC_ACL_EXTENDED) != 1 || 340 fpathconf(dest_fd, _PC_ACL_EXTENDED) != 1) 341 return (0); 342 acl = acl_get_fd(source_fd); 343 if (acl == NULL) { 344 warn("failed to get acl entries while setting %s", to.p_path); 345 return (1); 346 } 347 aclp = &acl->ats_acl; 348 if (aclp->acl_cnt == 3) 349 return (0); 350 if (acl_set_fd(dest_fd, acl) < 0) { 351 warn("failed to set acl entries for %s", to.p_path); 352 return (1); 353 } 354 return (0); 355 } 356 357 int 358 preserve_dir_acls(struct stat *fs, char *source_dir, char *dest_dir) 359 { 360 acl_t (*aclgetf)(const char *, acl_type_t); 361 int (*aclsetf)(const char *, acl_type_t, acl_t); 362 struct acl *aclp; 363 acl_t acl; 364 365 if (pathconf(source_dir, _PC_ACL_EXTENDED) != 1 || 366 pathconf(dest_dir, _PC_ACL_EXTENDED) != 1) 367 return (0); 368 /* 369 * If the file is a link we will not follow it 370 */ 371 if (S_ISLNK(fs->st_mode)) { 372 aclgetf = acl_get_link_np; 373 aclsetf = acl_set_link_np; 374 } else { 375 aclgetf = acl_get_file; 376 aclsetf = acl_set_file; 377 } 378 /* 379 * Even if there is no ACL_TYPE_DEFAULT entry here, a zero 380 * size ACL will be returned. So it is not safe to simply 381 * check the pointer to see if the default ACL is present. 382 */ 383 acl = aclgetf(source_dir, ACL_TYPE_DEFAULT); 384 if (acl == NULL) { 385 warn("failed to get default acl entries on %s", 386 source_dir); 387 return (1); 388 } 389 aclp = &acl->ats_acl; 390 if (aclp->acl_cnt != 0 && aclsetf(dest_dir, 391 ACL_TYPE_DEFAULT, acl) < 0) { 392 warn("failed to set default acl entries on %s", 393 dest_dir); 394 return (1); 395 } 396 acl = aclgetf(source_dir, ACL_TYPE_ACCESS); 397 if (acl == NULL) { 398 warn("failed to get acl entries on %s", source_dir); 399 return (1); 400 } 401 aclp = &acl->ats_acl; 402 if (aclsetf(dest_dir, ACL_TYPE_ACCESS, acl) < 0) { 403 warn("failed to set acl entries on %s", dest_dir); 404 return (1); 405 } 406 return (0); 407 } 408 409 void 410 usage(void) 411 { 412 413 (void)fprintf(stderr, "%s\n%s\n", 414 "usage: cp [-R [-H | -L | -P]] [-f | -i | -n] [-pv] source_file target_file", 415 " cp [-R [-H | -L | -P]] [-f | -i | -n] [-pv] source_file ... " 416 "target_directory"); 417 exit(EX_USAGE); 418 } 419