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 const 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 #if 0 45 static char sccsid[] = "@(#)cp.c 8.2 (Berkeley) 4/1/94"; 46 #endif 47 static const char rcsid[] = 48 "$Id: cp.c,v 1.18 1999/04/25 21:13:32 imp Exp $"; 49 #endif /* not lint */ 50 51 /* 52 * Cp copies source files to target files. 53 * 54 * The global PATH_T structure "to" always contains the path to the 55 * current target file. Since fts(3) does not change directories, 56 * this path can be either absolute or dot-relative. 57 * 58 * The basic algorithm is to initialize "to" and use fts(3) to traverse 59 * the file hierarchy rooted in the argument list. A trivial case is the 60 * case of 'cp file1 file2'. The more interesting case is the case of 61 * 'cp file1 file2 ... fileN dir' where the hierarchy is traversed and the 62 * path (relative to the root of the traversal) is appended to dir (stored 63 * in "to") to form the final target path. 64 */ 65 66 #include <sys/param.h> 67 #include <sys/stat.h> 68 69 #include <err.h> 70 #include <errno.h> 71 #include <fts.h> 72 #include <string.h> 73 #include <unistd.h> 74 75 #include "extern.h" 76 77 #define STRIP_TRAILING_SLASH(p) { \ 78 while ((p).p_end > (p).p_path + 1 && (p).p_end[-1] == '/') \ 79 *--(p).p_end = 0; \ 80 } 81 82 PATH_T to = { to.p_path, "" }; 83 84 uid_t myuid; 85 int Rflag, iflag, pflag, rflag, fflag; 86 int myumask; 87 88 enum op { FILE_TO_FILE, FILE_TO_DIR, DIR_TO_DNE }; 89 90 int copy __P((char *[], enum op, int)); 91 int mastercmp __P((const FTSENT **, const FTSENT **)); 92 93 int 94 main(argc, argv) 95 int argc; 96 char *argv[]; 97 { 98 struct stat to_stat, tmp_stat; 99 enum op type; 100 int Hflag, Lflag, Pflag, ch, fts_options, r; 101 char *target; 102 103 Hflag = Lflag = Pflag = 0; 104 while ((ch = getopt(argc, argv, "HLPRfipr")) != -1) 105 switch (ch) { 106 case 'H': 107 Hflag = 1; 108 Lflag = Pflag = 0; 109 break; 110 case 'L': 111 Lflag = 1; 112 Hflag = Pflag = 0; 113 break; 114 case 'P': 115 Pflag = 1; 116 Hflag = Lflag = 0; 117 break; 118 case 'R': 119 Rflag = 1; 120 break; 121 case 'f': 122 fflag = 1; 123 iflag = 0; 124 break; 125 case 'i': 126 iflag = 1; 127 fflag = 0; 128 break; 129 case 'p': 130 pflag = 1; 131 break; 132 case 'r': 133 rflag = 1; 134 break; 135 default: 136 usage(); 137 break; 138 } 139 argc -= optind; 140 argv += optind; 141 142 if (argc < 2) 143 usage(); 144 145 fts_options = FTS_NOCHDIR | FTS_PHYSICAL; 146 if (rflag) { 147 if (Rflag) 148 errx(1, 149 "the -R and -r options may not be specified together."); 150 if (Hflag || Lflag || Pflag) 151 errx(1, 152 "the -H, -L, and -P options may not be specified with the -r option."); 153 fts_options &= ~FTS_PHYSICAL; 154 fts_options |= FTS_LOGICAL; 155 } 156 if (Rflag) { 157 if (Hflag) 158 fts_options |= FTS_COMFOLLOW; 159 if (Lflag) { 160 fts_options &= ~FTS_PHYSICAL; 161 fts_options |= FTS_LOGICAL; 162 } 163 } else { 164 fts_options &= ~FTS_PHYSICAL; 165 fts_options |= FTS_LOGICAL; 166 } 167 168 myuid = getuid(); 169 170 /* Copy the umask for explicit mode setting. */ 171 myumask = umask(0); 172 (void)umask(myumask); 173 174 /* Save the target base in "to". */ 175 target = argv[--argc]; 176 if (strlen(target) > MAXPATHLEN) 177 errx(1, "%s: name too long", target); 178 (void)strcpy(to.p_path, target); 179 to.p_end = to.p_path + strlen(to.p_path); 180 if (to.p_path == to.p_end) { 181 *to.p_end++ = '.'; 182 *to.p_end = 0; 183 } 184 STRIP_TRAILING_SLASH(to); 185 to.target_end = to.p_end; 186 187 /* Set end of argument list for fts(3). */ 188 argv[argc] = NULL; 189 190 /* 191 * Cp has two distinct cases: 192 * 193 * cp [-R] source target 194 * cp [-R] source1 ... sourceN directory 195 * 196 * In both cases, source can be either a file or a directory. 197 * 198 * In (1), the target becomes a copy of the source. That is, if the 199 * source is a file, the target will be a file, and likewise for 200 * directories. 201 * 202 * In (2), the real target is not directory, but "directory/source". 203 */ 204 r = stat(to.p_path, &to_stat); 205 if (r == -1 && errno != ENOENT) 206 err(1, "%s", to.p_path); 207 if (r == -1 || !S_ISDIR(to_stat.st_mode)) { 208 /* 209 * Case (1). Target is not a directory. 210 */ 211 if (argc > 1) { 212 usage(); 213 exit(1); 214 } 215 /* 216 * Need to detect the case: 217 * cp -R dir foo 218 * Where dir is a directory and foo does not exist, where 219 * we want pathname concatenations turned on but not for 220 * the initial mkdir(). 221 */ 222 if (r == -1) { 223 if (rflag || (Rflag && (Lflag || Hflag))) 224 stat(*argv, &tmp_stat); 225 else 226 lstat(*argv, &tmp_stat); 227 228 if (S_ISDIR(tmp_stat.st_mode) && (Rflag || rflag)) 229 type = DIR_TO_DNE; 230 else 231 type = FILE_TO_FILE; 232 } else 233 type = FILE_TO_FILE; 234 } else 235 /* 236 * Case (2). Target is a directory. 237 */ 238 type = FILE_TO_DIR; 239 240 exit (copy(argv, type, fts_options)); 241 } 242 243 int 244 copy(argv, type, fts_options) 245 char *argv[]; 246 enum op type; 247 int fts_options; 248 { 249 struct stat to_stat; 250 FTS *ftsp; 251 FTSENT *curr; 252 int base = 0, dne, nlen, rval; 253 char *p, *target_mid; 254 255 if ((ftsp = fts_open(argv, fts_options, mastercmp)) == NULL) 256 err(1, NULL); 257 for (rval = 0; (curr = fts_read(ftsp)) != NULL;) { 258 switch (curr->fts_info) { 259 case FTS_NS: 260 case FTS_DNR: 261 case FTS_ERR: 262 warnx("%s: %s", 263 curr->fts_path, strerror(curr->fts_errno)); 264 rval = 1; 265 continue; 266 case FTS_DC: /* Warn, continue. */ 267 warnx("%s: directory causes a cycle", curr->fts_path); 268 rval = 1; 269 continue; 270 case FTS_DP: /* Ignore, continue. */ 271 continue; 272 } 273 274 /* 275 * If we are in case (2) or (3) above, we need to append the 276 * source name to the target name. 277 */ 278 if (type != FILE_TO_FILE) { 279 /* 280 * Need to remember the roots of traversals to create 281 * correct pathnames. If there's a directory being 282 * copied to a non-existent directory, e.g. 283 * cp -R a/dir noexist 284 * the resulting path name should be noexist/foo, not 285 * noexist/dir/foo (where foo is a file in dir), which 286 * is the case where the target exists. 287 * 288 * Also, check for "..". This is for correct path 289 * concatenation for paths ending in "..", e.g. 290 * cp -R .. /tmp 291 * Paths ending in ".." are changed to ".". This is 292 * tricky, but seems the easiest way to fix the problem. 293 * 294 * XXX 295 * Since the first level MUST be FTS_ROOTLEVEL, base 296 * is always initialized. 297 */ 298 if (curr->fts_level == FTS_ROOTLEVEL) { 299 if (type != DIR_TO_DNE) { 300 p = strrchr(curr->fts_path, '/'); 301 base = (p == NULL) ? 0 : 302 (int)(p - curr->fts_path + 1); 303 304 if (!strcmp(&curr->fts_path[base], 305 "..")) 306 base += 1; 307 } else 308 base = curr->fts_pathlen; 309 } 310 311 p = &curr->fts_path[base]; 312 nlen = curr->fts_pathlen - base; 313 target_mid = to.target_end; 314 if (*p != '/' && target_mid[-1] != '/') 315 *target_mid++ = '/'; 316 *target_mid = 0; 317 if (target_mid - to.p_path + nlen > MAXPATHLEN) { 318 warnx("%s%s: name too long (not copied)", 319 to.p_path, p); 320 rval = 1; 321 continue; 322 } 323 (void)strncat(target_mid, p, nlen); 324 to.p_end = target_mid + nlen; 325 *to.p_end = 0; 326 STRIP_TRAILING_SLASH(to); 327 } 328 329 /* Not an error but need to remember it happened */ 330 if (stat(to.p_path, &to_stat) == -1) 331 dne = 1; 332 else { 333 if (to_stat.st_dev == curr->fts_statp->st_dev && 334 to_stat.st_ino == curr->fts_statp->st_ino) { 335 warnx("%s and %s are identical (not copied).", 336 to.p_path, curr->fts_path); 337 rval = 1; 338 if (S_ISDIR(curr->fts_statp->st_mode)) 339 (void)fts_set(ftsp, curr, FTS_SKIP); 340 continue; 341 } 342 if (!S_ISDIR(curr->fts_statp->st_mode) && 343 S_ISDIR(to_stat.st_mode)) { 344 warnx("cannot overwrite directory %s with non-directory %s", 345 to.p_path, curr->fts_path); 346 rval = 1; 347 continue; 348 } 349 dne = 0; 350 } 351 352 switch (curr->fts_statp->st_mode & S_IFMT) { 353 case S_IFLNK: 354 if (copy_link(curr, !dne)) 355 rval = 1; 356 break; 357 case S_IFDIR: 358 if (!Rflag && !rflag) { 359 warnx("%s is a directory (not copied).", 360 curr->fts_path); 361 (void)fts_set(ftsp, curr, FTS_SKIP); 362 rval = 1; 363 break; 364 } 365 /* 366 * If the directory doesn't exist, create the new 367 * one with the from file mode plus owner RWX bits, 368 * modified by the umask. Trade-off between being 369 * able to write the directory (if from directory is 370 * 555) and not causing a permissions race. If the 371 * umask blocks owner writes, we fail.. 372 */ 373 if (dne) { 374 if (mkdir(to.p_path, 375 curr->fts_statp->st_mode | S_IRWXU) < 0) 376 err(1, "%s", to.p_path); 377 } else if (!S_ISDIR(to_stat.st_mode)) { 378 errno = ENOTDIR; 379 err(1, "%s", to.p_path); 380 } 381 /* 382 * If not -p and directory didn't exist, set it to be 383 * the same as the from directory, umodified by the 384 * umask; arguably wrong, but it's been that way 385 * forever. 386 */ 387 if (pflag && setfile(curr->fts_statp, 0)) 388 rval = 1; 389 else if (dne) 390 (void)chmod(to.p_path, 391 curr->fts_statp->st_mode); 392 break; 393 case S_IFBLK: 394 case S_IFCHR: 395 if (Rflag) { 396 if (copy_special(curr->fts_statp, !dne)) 397 rval = 1; 398 } else { 399 if (copy_file(curr, dne)) 400 rval = 1; 401 } 402 break; 403 case S_IFIFO: 404 if (Rflag) { 405 if (copy_fifo(curr->fts_statp, !dne)) 406 rval = 1; 407 } else { 408 if (copy_file(curr, dne)) 409 rval = 1; 410 } 411 break; 412 default: 413 if (copy_file(curr, dne)) 414 rval = 1; 415 break; 416 } 417 } 418 if (errno) 419 err(1, "fts_read"); 420 return (rval); 421 } 422 423 /* 424 * mastercmp -- 425 * The comparison function for the copy order. The order is to copy 426 * non-directory files before directory files. The reason for this 427 * is because files tend to be in the same cylinder group as their 428 * parent directory, whereas directories tend not to be. Copying the 429 * files first reduces seeking. 430 */ 431 int 432 mastercmp(a, b) 433 const FTSENT **a, **b; 434 { 435 int a_info, b_info; 436 437 a_info = (*a)->fts_info; 438 if (a_info == FTS_ERR || a_info == FTS_NS || a_info == FTS_DNR) 439 return (0); 440 b_info = (*b)->fts_info; 441 if (b_info == FTS_ERR || b_info == FTS_NS || b_info == FTS_DNR) 442 return (0); 443 if (a_info == FTS_D) 444 return (-1); 445 if (b_info == FTS_D) 446 return (1); 447 return (0); 448 } 449