1 /*- 2 * Copyright (c) 1992 Keith Muller. 3 * Copyright (c) 1992, 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * Keith Muller of the University of California, San Diego. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by the University of 20 * California, Berkeley and its contributors. 21 * 4. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 */ 37 38 #ifndef lint 39 #if 0 40 static char sccsid[] = "@(#)ftree.c 8.2 (Berkeley) 4/18/94"; 41 #endif 42 static const char rcsid[] = 43 "$FreeBSD$"; 44 #endif /* not lint */ 45 46 #include <sys/types.h> 47 #include <sys/time.h> 48 #include <sys/stat.h> 49 #include <unistd.h> 50 #include <string.h> 51 #include <stdio.h> 52 #include <errno.h> 53 #include <stdlib.h> 54 #include <fts.h> 55 #include "pax.h" 56 #include "ftree.h" 57 #include "extern.h" 58 59 /* 60 * routines to interface with the fts library function. 61 * 62 * file args supplied to pax are stored on a single linked list (of type FTREE) 63 * and given to fts to be processed one at a time. pax "selects" files from 64 * the expansion of each arg into the corresponding file tree (if the arg is a 65 * directory, otherwise the node itself is just passed to pax). The selection 66 * is modified by the -n and -u flags. The user is informed when a specific 67 * file arg does not generate any selected files. -n keeps expanding the file 68 * tree arg until one of its files is selected, then skips to the next file 69 * arg. when the user does not supply the file trees as command line args to 70 * pax, they are read from stdin 71 */ 72 73 static FTS *ftsp = NULL; /* current FTS handle */ 74 static int ftsopts; /* options to be used on fts_open */ 75 static char *farray[2]; /* array for passing each arg to fts */ 76 static FTREE *fthead = NULL; /* head of linked list of file args */ 77 static FTREE *fttail = NULL; /* tail of linked list of file args */ 78 static FTREE *ftcur = NULL; /* current file arg being processed */ 79 static FTSENT *ftent = NULL; /* current file tree entry */ 80 static int ftree_skip; /* when set skip to next file arg */ 81 82 static int ftree_arg __P((void)); 83 84 /* 85 * ftree_start() 86 * initialize the options passed to fts_open() during this run of pax 87 * options are based on the selection of pax options by the user 88 * fts_start() also calls fts_arg() to open the first valid file arg. We 89 * also attempt to reset directory access times when -t (tflag) is set. 90 * Return: 91 * 0 if there is at least one valid file arg to process, -1 otherwise 92 */ 93 94 #ifdef __STDC__ 95 int 96 ftree_start(void) 97 #else 98 int 99 ftree_start() 100 #endif 101 { 102 /* 103 * set up the operation mode of fts, open the first file arg. We must 104 * use FTS_NOCHDIR, as the user may have to open multiple archives and 105 * if fts did a chdir off into the boondocks, we may create an archive 106 * volume in an place where the user did not expect to. 107 */ 108 ftsopts = FTS_NOCHDIR; 109 110 /* 111 * optional user flags that effect file traversal 112 * -H command line symlink follow only (half follow) 113 * -L follow sylinks (logical) 114 * -P do not follow sylinks (physical). This is the default. 115 * -X do not cross over mount points 116 * -t preserve access times on files read. 117 * -n select only the first member of a file tree when a match is found 118 * -d do not extract subtrees rooted at a directory arg. 119 */ 120 if (Lflag) 121 ftsopts |= FTS_LOGICAL; 122 else 123 ftsopts |= FTS_PHYSICAL; 124 if (Hflag) 125 # ifdef NET2_FTS 126 paxwarn(0, "The -H flag is not supported on this version"); 127 # else 128 ftsopts |= FTS_COMFOLLOW; 129 # endif 130 if (Xflag) 131 ftsopts |= FTS_XDEV; 132 133 if ((fthead == NULL) && ((farray[0] = malloc(PAXPATHLEN+2)) == NULL)) { 134 paxwarn(1, "Unable to allocate memory for file name buffer"); 135 return(-1); 136 } 137 138 if (ftree_arg() < 0) 139 return(-1); 140 if (tflag && (atdir_start() < 0)) 141 return(-1); 142 return(0); 143 } 144 145 /* 146 * ftree_add() 147 * add the arg to the linked list of files to process. Each will be 148 * processed by fts one at a time 149 * Return: 150 * 0 if added to the linked list, -1 if failed 151 */ 152 153 #ifdef __STDC__ 154 int 155 ftree_add(register char *str, int chflg) 156 #else 157 int 158 ftree_add(str, chflg) 159 register char *str; 160 int chflg; 161 #endif 162 { 163 register FTREE *ft; 164 register int len; 165 166 /* 167 * simple check for bad args 168 */ 169 if ((str == NULL) || (*str == '\0')) { 170 paxwarn(0, "Invalid file name argument"); 171 return(-1); 172 } 173 174 /* 175 * allocate FTREE node and add to the end of the linked list (args are 176 * processed in the same order they were passed to pax). Get rid of any 177 * trailing / the user may pass us. (watch out for / by itself). 178 */ 179 if ((ft = (FTREE *)malloc(sizeof(FTREE))) == NULL) { 180 paxwarn(0, "Unable to allocate memory for filename"); 181 return(-1); 182 } 183 184 if (((len = strlen(str) - 1) > 0) && (str[len] == '/')) 185 str[len] = '\0'; 186 ft->fname = str; 187 ft->refcnt = 0; 188 ft->chflg = chflg; 189 ft->fow = NULL; 190 if (fthead == NULL) { 191 fttail = fthead = ft; 192 return(0); 193 } 194 fttail->fow = ft; 195 fttail = ft; 196 return(0); 197 } 198 199 /* 200 * ftree_sel() 201 * this entry has been selected by pax. bump up reference count and handle 202 * -n and -d processing. 203 */ 204 205 #ifdef __STDC__ 206 void 207 ftree_sel(register ARCHD *arcn) 208 #else 209 void 210 ftree_sel(arcn) 211 register ARCHD *arcn; 212 #endif 213 { 214 /* 215 * set reference bit for this pattern. This linked list is only used 216 * when file trees are supplied pax as args. The list is not used when 217 * the trees are read from stdin. 218 */ 219 if (ftcur != NULL) 220 ftcur->refcnt = 1; 221 222 /* 223 * if -n we are done with this arg, force a skip to the next arg when 224 * pax asks for the next file in next_file(). 225 * if -d we tell fts only to match the directory (if the arg is a dir) 226 * and not the entire file tree rooted at that point. 227 */ 228 if (nflag) 229 ftree_skip = 1; 230 231 if (!dflag || (arcn->type != PAX_DIR)) 232 return; 233 234 if (ftent != NULL) 235 (void)fts_set(ftsp, ftent, FTS_SKIP); 236 } 237 238 /* 239 * ftree_chk() 240 * called at end on pax execution. Prints all those file args that did not 241 * have a selected member (reference count still 0) 242 */ 243 244 #ifdef __STDC__ 245 void 246 ftree_chk(void) 247 #else 248 void 249 ftree_chk() 250 #endif 251 { 252 register FTREE *ft; 253 register int wban = 0; 254 255 /* 256 * make sure all dir access times were reset. 257 */ 258 if (tflag) 259 atdir_end(); 260 261 /* 262 * walk down list and check reference count. Print out those members 263 * that never had a match 264 */ 265 for (ft = fthead; ft != NULL; ft = ft->fow) { 266 if ((ft->refcnt > 0) || ft->chflg) 267 continue; 268 if (wban == 0) { 269 paxwarn(1,"WARNING! These file names were not selected:"); 270 ++wban; 271 } 272 (void)fprintf(stderr, "%s\n", ft->fname); 273 } 274 } 275 276 /* 277 * ftree_arg() 278 * Get the next file arg for fts to process. Can be from either the linked 279 * list or read from stdin when the user did not them as args to pax. Each 280 * arg is processed until the first successful fts_open(). 281 * Return: 282 * 0 when the next arg is ready to go, -1 if out of file args (or EOF on 283 * stdin). 284 */ 285 286 #ifdef __STDC__ 287 static int 288 ftree_arg(void) 289 #else 290 static int 291 ftree_arg() 292 #endif 293 { 294 register char *pt; 295 296 /* 297 * close off the current file tree 298 */ 299 if (ftsp != NULL) { 300 (void)fts_close(ftsp); 301 ftsp = NULL; 302 } 303 304 /* 305 * keep looping until we get a valid file tree to process. Stop when we 306 * reach the end of the list (or get an eof on stdin) 307 */ 308 for(;;) { 309 if (fthead == NULL) { 310 /* 311 * the user didn't supply any args, get the file trees 312 * to process from stdin; 313 */ 314 if (fgets(farray[0], PAXPATHLEN+1, stdin) == NULL) 315 return(-1); 316 if ((pt = strchr(farray[0], '\n')) != NULL) 317 *pt = '\0'; 318 } else { 319 /* 320 * the user supplied the file args as arguments to pax 321 */ 322 if (ftcur == NULL) 323 ftcur = fthead; 324 else if ((ftcur = ftcur->fow) == NULL) 325 return(-1); 326 if (ftcur->chflg) { 327 /* First fchdir() back... */ 328 if (fchdir(cwdfd) < 0) { 329 syswarn(1, errno, 330 "Can't fchdir to starting directory"); 331 return(-1); 332 } 333 if (chdir(ftcur->fname) < 0) { 334 syswarn(1, errno, "Can't chdir to %s", 335 ftcur->fname); 336 return(-1); 337 } 338 continue; 339 } else 340 farray[0] = ftcur->fname; 341 } 342 343 /* 344 * watch it, fts wants the file arg stored in a array of char 345 * ptrs, with the last one a null. we use a two element array 346 * and set farray[0] to point at the buffer with the file name 347 * in it. We cannot pass all the file args to fts at one shot 348 * as we need to keep a handle on which file arg generates what 349 * files (the -n and -d flags need this). If the open is 350 * successful, return a 0. 351 */ 352 if ((ftsp = fts_open(farray, ftsopts, NULL)) != NULL) 353 break; 354 } 355 return(0); 356 } 357 358 /* 359 * next_file() 360 * supplies the next file to process in the supplied archd structure. 361 * Return: 362 * 0 when contents of arcn have been set with the next file, -1 when done. 363 */ 364 365 #ifdef __STDC__ 366 int 367 next_file(register ARCHD *arcn) 368 #else 369 int 370 next_file(arcn) 371 register ARCHD *arcn; 372 #endif 373 { 374 register int cnt; 375 time_t atime; 376 time_t mtime; 377 378 /* 379 * ftree_sel() might have set the ftree_skip flag if the user has the 380 * -n option and a file was selected from this file arg tree. (-n says 381 * only one member is matched for each pattern) ftree_skip being 1 382 * forces us to go to the next arg now. 383 */ 384 if (ftree_skip) { 385 /* 386 * clear and go to next arg 387 */ 388 ftree_skip = 0; 389 if (ftree_arg() < 0) 390 return(-1); 391 } 392 393 /* 394 * loop until we get a valid file to process 395 */ 396 for(;;) { 397 if ((ftent = fts_read(ftsp)) == NULL) { 398 /* 399 * out of files in this tree, go to next arg, if none 400 * we are done 401 */ 402 if (ftree_arg() < 0) 403 return(-1); 404 continue; 405 } 406 407 /* 408 * handle each type of fts_read() flag 409 */ 410 switch(ftent->fts_info) { 411 case FTS_D: 412 case FTS_DEFAULT: 413 case FTS_F: 414 case FTS_SL: 415 case FTS_SLNONE: 416 /* 417 * these are all ok 418 */ 419 break; 420 case FTS_DP: 421 /* 422 * already saw this directory. If the user wants file 423 * access times reset, we use this to restore the 424 * access time for this directory since this is the 425 * last time we will see it in this file subtree 426 * remember to force the time (this is -t on a read 427 * directory, not a created directory). 428 */ 429 # ifdef NET2_FTS 430 if (!tflag || (get_atdir(ftent->fts_statb.st_dev, 431 ftent->fts_statb.st_ino, &mtime, &atime) < 0)) 432 # else 433 if (!tflag || (get_atdir(ftent->fts_statp->st_dev, 434 ftent->fts_statp->st_ino, &mtime, &atime) < 0)) 435 # endif 436 continue; 437 set_ftime(ftent->fts_path, mtime, atime, 1); 438 continue; 439 case FTS_DC: 440 /* 441 * fts claims a file system cycle 442 */ 443 paxwarn(1,"File system cycle found at %s",ftent->fts_path); 444 continue; 445 case FTS_DNR: 446 # ifdef NET2_FTS 447 syswarn(1, errno, 448 # else 449 syswarn(1, ftent->fts_errno, 450 # endif 451 "Unable to read directory %s", ftent->fts_path); 452 continue; 453 case FTS_ERR: 454 # ifdef NET2_FTS 455 syswarn(1, errno, 456 # else 457 syswarn(1, ftent->fts_errno, 458 # endif 459 "File system traversal error"); 460 continue; 461 case FTS_NS: 462 case FTS_NSOK: 463 # ifdef NET2_FTS 464 syswarn(1, errno, 465 # else 466 syswarn(1, ftent->fts_errno, 467 # endif 468 "Unable to access %s", ftent->fts_path); 469 continue; 470 } 471 472 /* 473 * ok got a file tree node to process. copy info into arcn 474 * structure (initialize as required) 475 */ 476 arcn->skip = 0; 477 arcn->pad = 0; 478 arcn->ln_nlen = 0; 479 arcn->ln_name[0] = '\0'; 480 # ifdef NET2_FTS 481 arcn->sb = ftent->fts_statb; 482 # else 483 arcn->sb = *(ftent->fts_statp); 484 # endif 485 486 /* 487 * file type based set up and copy into the arcn struct 488 * SIDE NOTE: 489 * we try to reset the access time on all files and directories 490 * we may read when the -t flag is specified. files are reset 491 * when we close them after copying. we reset the directories 492 * when we are done with their file tree (we also clean up at 493 * end in case we cut short a file tree traversal). However 494 * there is no way to reset access times on symlinks. 495 */ 496 switch(S_IFMT & arcn->sb.st_mode) { 497 case S_IFDIR: 498 arcn->type = PAX_DIR; 499 if (!tflag) 500 break; 501 add_atdir(ftent->fts_path, arcn->sb.st_dev, 502 arcn->sb.st_ino, arcn->sb.st_mtime, 503 arcn->sb.st_atime); 504 break; 505 case S_IFCHR: 506 arcn->type = PAX_CHR; 507 break; 508 case S_IFBLK: 509 arcn->type = PAX_BLK; 510 break; 511 case S_IFREG: 512 /* 513 * only regular files with have data to store on the 514 * archive. all others will store a zero length skip. 515 * the skip field is used by pax for actual data it has 516 * to read (or skip over). 517 */ 518 arcn->type = PAX_REG; 519 arcn->skip = arcn->sb.st_size; 520 break; 521 case S_IFLNK: 522 arcn->type = PAX_SLK; 523 /* 524 * have to read the symlink path from the file 525 */ 526 if ((cnt = readlink(ftent->fts_path, arcn->ln_name, 527 PAXPATHLEN - 1)) < 0) { 528 syswarn(1, errno, "Unable to read symlink %s", 529 ftent->fts_path); 530 continue; 531 } 532 /* 533 * set link name length, watch out readlink does not 534 * always NUL terminate the link path 535 */ 536 arcn->ln_name[cnt] = '\0'; 537 arcn->ln_nlen = cnt; 538 break; 539 case S_IFSOCK: 540 /* 541 * under BSD storing a socket is senseless but we will 542 * let the format specific write function make the 543 * decision of what to do with it. 544 */ 545 arcn->type = PAX_SCK; 546 break; 547 case S_IFIFO: 548 arcn->type = PAX_FIF; 549 break; 550 } 551 break; 552 } 553 554 /* 555 * copy file name, set file name length 556 */ 557 arcn->nlen = l_strncpy(arcn->name, ftent->fts_path, sizeof(arcn->name) - 1); 558 arcn->name[arcn->nlen] = '\0'; 559 arcn->org_name = ftent->fts_path; 560 return(0); 561 } 562