1 /* 2 * Copyright (c) 1988, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * David Hitz of Auspex Systems Inc. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #ifndef lint 38 static char copyright[] = 39 "@(#) Copyright (c) 1988, 1993, 1994\n\ 40 The Regents of the University of California. All rights reserved.\n"; 41 #endif /* not lint */ 42 43 #ifndef lint 44 /*static char sccsid[] = "from: @(#)cp.c 8.2 (Berkeley) 4/1/94";*/ 45 static char *rcsid = "$Id: cp.c,v 1.10 1994/09/22 09:24:40 mycroft Exp $"; 46 #endif /* not lint */ 47 48 /* 49 * Cp copies source files to target files. 50 * 51 * The global PATH_T structure "to" always contains the path to the 52 * current target file. Since fts(3) does not change directories, 53 * this path can be either absolute or dot-relative. 54 * 55 * The basic algorithm is to initialize "to" and use fts(3) to traverse 56 * the file hierarchy rooted in the argument list. A trivial case is the 57 * case of 'cp file1 file2'. The more interesting case is the case of 58 * 'cp file1 file2 ... fileN dir' where the hierarchy is traversed and the 59 * path (relative to the root of the traversal) is appended to dir (stored 60 * in "to") to form the final target path. 61 */ 62 63 #include <sys/param.h> 64 #include <sys/stat.h> 65 #include <sys/mman.h> 66 #include <sys/time.h> 67 68 #include <dirent.h> 69 #include <err.h> 70 #include <errno.h> 71 #include <fcntl.h> 72 #include <fts.h> 73 #include <stdio.h> 74 #include <stdlib.h> 75 #include <string.h> 76 #include <unistd.h> 77 78 #include "extern.h" 79 80 #define STRIP_TRAILING_SLASH(p) { \ 81 while ((p).p_end > (p).p_path && (p).p_end[-1] == '/') \ 82 *--(p).p_end = 0; \ 83 } 84 85 PATH_T to = { to.p_path, "" }; 86 87 uid_t myuid; 88 int Rflag, iflag, pflag, rflag; 89 int myumask; 90 91 enum op { FILE_TO_FILE, FILE_TO_DIR, DIR_TO_DNE }; 92 93 int copy __P((char *[], enum op, int)); 94 int mastercmp __P((const FTSENT **, const FTSENT **)); 95 96 int 97 main(argc, argv) 98 int argc; 99 char *argv[]; 100 { 101 struct stat to_stat, tmp_stat; 102 enum op type; 103 int Hflag, Lflag, Pflag, ch, fts_options, r; 104 char *target; 105 106 Hflag = Lflag = Pflag = Rflag = 0; 107 while ((ch = getopt(argc, argv, "HLPRfipr")) != EOF) 108 switch (ch) { 109 case 'H': 110 Hflag = 1; 111 Lflag = Pflag = 0; 112 break; 113 case 'L': 114 Lflag = 1; 115 Hflag = Pflag = 0; 116 break; 117 case 'P': 118 Pflag = 1; 119 Hflag = Lflag = 0; 120 break; 121 case 'R': 122 Rflag = 1; 123 break; 124 case 'f': 125 iflag = 0; 126 break; 127 case 'i': 128 iflag = isatty(fileno(stdin)); 129 break; 130 case 'p': 131 pflag = 1; 132 break; 133 case 'r': 134 rflag = 1; 135 break; 136 case '?': 137 default: 138 usage(); 139 break; 140 } 141 argc -= optind; 142 argv += optind; 143 144 if (argc < 2) 145 usage(); 146 147 fts_options = FTS_NOCHDIR | FTS_PHYSICAL; 148 if (rflag) { 149 if (Rflag) 150 errx(1, 151 "the -R and -r options may not be specified together."); 152 if (Hflag || Lflag || Pflag) 153 errx(1, 154 "the -H, -L, and -P options may not be specified with the -r option."); 155 fts_options &= ~FTS_PHYSICAL; 156 fts_options |= FTS_LOGICAL; 157 } 158 if (Rflag) { 159 if (Hflag) 160 fts_options |= FTS_COMFOLLOW; 161 if (Lflag) { 162 fts_options &= ~FTS_PHYSICAL; 163 fts_options |= FTS_LOGICAL; 164 } 165 } else { 166 fts_options &= ~FTS_PHYSICAL; 167 fts_options |= FTS_LOGICAL; 168 } 169 170 myuid = getuid(); 171 172 /* Copy the umask for explicit mode setting. */ 173 myumask = umask(0); 174 (void)umask(myumask); 175 176 /* Save the target base in "to". */ 177 target = argv[--argc]; 178 if (strlen(target) > MAXPATHLEN) 179 errx(1, "%s: name too long", target); 180 (void)strcpy(to.p_path, target); 181 to.p_end = to.p_path + strlen(to.p_path); 182 if (to.p_path == to.p_end) { 183 *to.p_end++ = '.'; 184 *to.p_end = 0; 185 } 186 STRIP_TRAILING_SLASH(to); 187 to.target_end = to.p_end; 188 189 /* Set end of argument list for fts(3). */ 190 argv[argc] = NULL; 191 192 /* 193 * Cp has two distinct cases: 194 * 195 * cp [-R] source target 196 * cp [-R] source1 ... sourceN directory 197 * 198 * In both cases, source can be either a file or a directory. 199 * 200 * In (1), the target becomes a copy of the source. That is, if the 201 * source is a file, the target will be a file, and likewise for 202 * directories. 203 * 204 * In (2), the real target is not directory, but "directory/source". 205 */ 206 r = stat(to.p_path, &to_stat); 207 if (r == -1 && errno != ENOENT) 208 err(1, "%s", to.p_path); 209 if (r == -1 || !S_ISDIR(to_stat.st_mode)) { 210 /* 211 * Case (1). Target is not a directory. 212 */ 213 if (argc > 1) { 214 usage(); 215 exit(1); 216 } 217 /* 218 * Need to detect the case: 219 * cp -R dir foo 220 * Where dir is a directory and foo does not exist, where 221 * we want pathname concatenations turned on but not for 222 * the initial mkdir(). 223 */ 224 if (r == -1) { 225 if (rflag || (Rflag && (Lflag || Hflag))) 226 stat(*argv, &tmp_stat); 227 else 228 lstat(*argv, &tmp_stat); 229 230 if (S_ISDIR(tmp_stat.st_mode) && (Rflag || rflag)) 231 type = DIR_TO_DNE; 232 else 233 type = FILE_TO_FILE; 234 } else 235 type = FILE_TO_FILE; 236 } else 237 /* 238 * Case (2). Target is a directory. 239 */ 240 type = FILE_TO_DIR; 241 242 exit (copy(argv, type, fts_options)); 243 } 244 245 int 246 copy(argv, type, fts_options) 247 char *argv[]; 248 enum op type; 249 int fts_options; 250 { 251 struct stat to_stat; 252 FTS *ftsp; 253 FTSENT *curr; 254 int base, dne, nlen, rval; 255 char *p; 256 257 if ((ftsp = fts_open(argv, fts_options, mastercmp)) == NULL) 258 err(1, NULL); 259 for (rval = 0; (curr = fts_read(ftsp)) != NULL;) { 260 switch (curr->fts_info) { 261 case FTS_NS: 262 case FTS_ERR: 263 warnx("%s: %s", 264 curr->fts_path, strerror(curr->fts_errno)); 265 rval = 1; 266 continue; 267 case FTS_DC: /* Warn, continue. */ 268 warnx("%s: directory causes a cycle", curr->fts_path); 269 rval = 1; 270 continue; 271 case FTS_DP: /* Ignore, continue. */ 272 continue; 273 } 274 275 /* 276 * If we are in case (2) or (3) above, we need to append the 277 * source name to the target name. 278 */ 279 if (type != FILE_TO_FILE) { 280 if ((curr->fts_namelen + 281 to.target_end - to.p_path + 1) > MAXPATHLEN) { 282 warnx("%s/%s: name too long (not copied)", 283 to.p_path, curr->fts_name); 284 rval = 1; 285 continue; 286 } 287 288 /* 289 * Need to remember the roots of traversals to create 290 * correct pathnames. If there's a directory being 291 * copied to a non-existent directory, e.g. 292 * cp -R a/dir noexist 293 * the resulting path name should be noexist/foo, not 294 * noexist/dir/foo (where foo is a file in dir), which 295 * is the case where the target exists. 296 * 297 * Also, check for "..". This is for correct path 298 * concatentation for paths ending in "..", e.g. 299 * cp -R .. /tmp 300 * Paths ending in ".." are changed to ".". This is 301 * tricky, but seems the easiest way to fix the problem. 302 * 303 * XXX 304 * Since the first level MUST be FTS_ROOTLEVEL, base 305 * is always initialized. 306 */ 307 if (curr->fts_level == FTS_ROOTLEVEL) 308 if (type != DIR_TO_DNE) { 309 p = strrchr(curr->fts_path, '/'); 310 base = (p == NULL) ? 0 : 311 (int)(p - curr->fts_path + 1); 312 313 if (!strcmp(&curr->fts_path[base], 314 "..")) 315 base += 1; 316 } else 317 base = curr->fts_pathlen; 318 319 if (to.target_end[-1] != '/') { 320 *to.target_end = '/'; 321 *(to.target_end + 1) = 0; 322 } 323 p = &curr->fts_path[base]; 324 nlen = curr->fts_pathlen - base; 325 326 (void)strncat(to.target_end + 1, p, nlen); 327 to.p_end = to.target_end + nlen + 1; 328 *to.p_end = 0; 329 STRIP_TRAILING_SLASH(to); 330 } 331 332 /* Not an error but need to remember it happened */ 333 if (stat(to.p_path, &to_stat) == -1) 334 dne = 1; 335 else { 336 if (to_stat.st_dev == curr->fts_statp->st_dev && 337 to_stat.st_ino == curr->fts_statp->st_ino) { 338 warnx("%s and %s are identical (not copied).", 339 to.p_path, curr->fts_path); 340 rval = 1; 341 if (S_ISDIR(curr->fts_statp->st_mode)) 342 (void)fts_set(ftsp, curr, FTS_SKIP); 343 continue; 344 } 345 if (!S_ISDIR(curr->fts_statp->st_mode) && 346 S_ISDIR(to_stat.st_mode)) { 347 warnx("cannot overwrite directory %s with non-directory %s.", 348 to.p_path, curr->fts_path); 349 rval = 1; 350 continue; 351 } 352 dne = 0; 353 } 354 355 switch (curr->fts_statp->st_mode & S_IFMT) { 356 case S_IFLNK: 357 if (copy_link(curr, !dne)) 358 rval = 1; 359 break; 360 case S_IFDIR: 361 if (!Rflag && !rflag) { 362 warnx("%s is a directory (not copied).", 363 curr->fts_path); 364 (void)fts_set(ftsp, curr, FTS_SKIP); 365 rval = 1; 366 break; 367 } 368 /* 369 * If the directory doesn't exist, create the new 370 * one with the from file mode plus owner RWX bits, 371 * modified by the umask. Trade-off between being 372 * able to write the directory (if from directory is 373 * 555) and not causing a permissions race. If the 374 * umask blocks owner writes, we fail.. 375 */ 376 if (dne) { 377 if (mkdir(to.p_path, 378 curr->fts_statp->st_mode | S_IRWXU) < 0) 379 err(1, "%s", to.p_path); 380 } else if (!S_ISDIR(to_stat.st_mode)) { 381 errno = ENOTDIR; 382 err(1, "%s: %s", to.p_path); 383 } 384 /* 385 * If not -p and directory didn't exist, set it to be 386 * the same as the from directory, umodified by the 387 * umask; arguably wrong, but it's been that way 388 * forever. 389 */ 390 if (pflag && setfile(curr->fts_statp, 0)) 391 rval = 1; 392 else if (dne) 393 (void)chmod(to.p_path, 394 curr->fts_statp->st_mode); 395 break; 396 case S_IFBLK: 397 case S_IFCHR: 398 if (Rflag) { 399 if (copy_special(curr->fts_statp, !dne)) 400 rval = 1; 401 } else 402 if (copy_file(curr, dne)) 403 rval = 1; 404 break; 405 case S_IFIFO: 406 if (Rflag) 407 if (copy_fifo(curr->fts_statp, !dne)) 408 rval = 1; 409 else 410 if (copy_file(curr, dne)) 411 rval = 1; 412 break; 413 default: 414 if (copy_file(curr, dne)) 415 rval = 1; 416 break; 417 } 418 } 419 if (errno) 420 err(1, "fts_read"); 421 return (rval); 422 } 423 424 /* 425 * mastercmp -- 426 * The comparison function for the copy order. The order is to copy 427 * non-directory files before directory files. The reason for this 428 * is because files tend to be in the same cylinder group as their 429 * parent directory, whereas directories tend not to be. Copying the 430 * files first reduces seeking. 431 */ 432 int 433 mastercmp(a, b) 434 const FTSENT **a, **b; 435 { 436 int a_info, b_info; 437 438 a_info = (*a)->fts_info; 439 if (a_info == FTS_ERR || a_info == FTS_NS || a_info == FTS_DNR) 440 return (0); 441 b_info = (*b)->fts_info; 442 if (b_info == FTS_ERR || b_info == FTS_NS || b_info == FTS_DNR) 443 return (0); 444 if (a_info == FTS_D) 445 return (-1); 446 if (b_info == FTS_D) 447 return (1); 448 return (0); 449 } 450