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 * $Id: ftree.c,v 1.3 1995/05/30 00:06:57 rgrimes Exp $ 38 */ 39 40 #ifndef lint 41 static char sccsid[] = "@(#)ftree.c 8.2 (Berkeley) 4/18/94"; 42 #endif /* not lint */ 43 44 #include <sys/types.h> 45 #include <sys/time.h> 46 #include <sys/stat.h> 47 #include <sys/param.h> 48 #include <unistd.h> 49 #include <string.h> 50 #include <stdio.h> 51 #include <errno.h> 52 #include <stdlib.h> 53 #include <fts.h> 54 #include "pax.h" 55 #include "ftree.h" 56 #include "extern.h" 57 58 /* 59 * routines to interface with the fts library function. 60 * 61 * file args supplied to pax are stored on a single linked list (of type FTREE) 62 * and given to fts to be processed one at a time. pax "selects" files from 63 * the expansion of each arg into the corresponding file tree (if the arg is a 64 * directory, otherwise the node itself is just passed to pax). The selection 65 * is modified by the -n and -u flags. The user is informed when a specific 66 * file arg does not generate any selected files. -n keeps expanding the file 67 * tree arg until one of its files is selected, then skips to the next file 68 * arg. when the user does not supply the file trees as command line args to 69 * pax, they are read from stdin 70 */ 71 72 static FTS *ftsp = NULL; /* curent FTS handle */ 73 static int ftsopts; /* options to be used on fts_open */ 74 static char *farray[2]; /* array for passing each arg to fts */ 75 static FTREE *fthead = NULL; /* head of linked list of file args */ 76 static FTREE *fttail = NULL; /* tail of linked list of file args */ 77 static FTREE *ftcur = NULL; /* current file arg being processed */ 78 static FTSENT *ftent = NULL; /* current file tree entry */ 79 static int ftree_skip; /* when set skip to next file arg */ 80 81 static int ftree_arg __P((void)); 82 83 /* 84 * ftree_start() 85 * initialize the options passed to fts_open() during this run of pax 86 * options are based on the selection of pax options by the user 87 * fts_start() also calls fts_arg() to open the first valid file arg. We 88 * also attempt to reset directory access times when -t (tflag) is set. 89 * Return: 90 * 0 if there is at least one valid file arg to process, -1 otherwise 91 */ 92 93 #if __STDC__ 94 int 95 ftree_start(void) 96 #else 97 int 98 ftree_start() 99 #endif 100 { 101 /* 102 * set up the operation mode of fts, open the first file arg. We must 103 * use FTS_NOCHDIR, as the user may have to open multiple archives and 104 * if fts did a chdir off into the boondocks, we may create an archive 105 * volume in an place where the user did not expect to. 106 */ 107 ftsopts = FTS_NOCHDIR; 108 109 /* 110 * optional user flags that effect file traversal 111 * -H command line symlink follow only (half follow) 112 * -L follow sylinks (logical) 113 * -P do not follow sylinks (physical). This is the default. 114 * -X do not cross over mount points 115 * -t preserve access times on files read. 116 * -n select only the first member of a file tree when a match is found 117 * -d do not extract subtrees rooted at a directory arg. 118 */ 119 if (Lflag) 120 ftsopts |= FTS_LOGICAL; 121 else 122 ftsopts |= FTS_PHYSICAL; 123 if (Hflag) 124 # ifdef NET2_FTS 125 warn(0, "The -H flag is not supported on this version"); 126 # else 127 ftsopts |= FTS_COMFOLLOW; 128 # endif 129 if (Xflag) 130 ftsopts |= FTS_XDEV; 131 132 if ((fthead == NULL) && ((farray[0] = malloc(PAXPATHLEN+2)) == NULL)) { 133 warn(1, "Unable to allocate memory for file name buffer"); 134 return(-1); 135 } 136 137 if (ftree_arg() < 0) 138 return(-1); 139 if (tflag && (atdir_start() < 0)) 140 return(-1); 141 return(0); 142 } 143 144 /* 145 * ftree_add() 146 * add the arg to the linked list of files to process. Each will be 147 * processed by fts one at a time 148 * Return: 149 * 0 if added to the linked list, -1 if failed 150 */ 151 152 #if __STDC__ 153 int 154 ftree_add(register char *str) 155 #else 156 int 157 ftree_add(str) 158 register char *str; 159 #endif 160 { 161 register FTREE *ft; 162 register int len; 163 164 /* 165 * simple check for bad args 166 */ 167 if ((str == NULL) || (*str == '\0')) { 168 warn(0, "Invalid file name arguement"); 169 return(-1); 170 } 171 172 /* 173 * allocate FTREE node and add to the end of the linked list (args are 174 * processed in the same order they were passed to pax). Get rid of any 175 * trailing / the user may pass us. (watch out for / by itself). 176 */ 177 if ((ft = (FTREE *)malloc(sizeof(FTREE))) == NULL) { 178 warn(0, "Unable to allocate memory for filename"); 179 return(-1); 180 } 181 182 if (((len = strlen(str) - 1) > 0) && (str[len] == '/')) 183 str[len] = '\0'; 184 ft->fname = str; 185 ft->refcnt = 0; 186 ft->fow = NULL; 187 if (fthead == NULL) { 188 fttail = fthead = ft; 189 return(0); 190 } 191 fttail->fow = ft; 192 fttail = ft; 193 return(0); 194 } 195 196 /* 197 * ftree_sel() 198 * this entry has been selected by pax. bump up reference count and handle 199 * -n and -d processing. 200 */ 201 202 #if __STDC__ 203 void 204 ftree_sel(register ARCHD *arcn) 205 #else 206 void 207 ftree_sel(arcn) 208 register ARCHD *arcn; 209 #endif 210 { 211 /* 212 * set reference bit for this pattern. This linked list is only used 213 * when file trees are supplied pax as args. The list is not used when 214 * the trees are read from stdin. 215 */ 216 if (ftcur != NULL) 217 ftcur->refcnt = 1; 218 219 /* 220 * if -n we are done with this arg, force a skip to the next arg when 221 * pax asks for the next file in next_file(). 222 * if -d we tell fts only to match the directory (if the arg is a dir) 223 * and not the entire file tree rooted at that point. 224 */ 225 if (nflag) 226 ftree_skip = 1; 227 228 if (!dflag || (arcn->type != PAX_DIR)) 229 return; 230 231 if (ftent != NULL) 232 (void)fts_set(ftsp, ftent, FTS_SKIP); 233 } 234 235 /* 236 * ftree_chk() 237 * called at end on pax execution. Prints all those file args that did not 238 * have a selected member (reference count still 0) 239 */ 240 241 #if __STDC__ 242 void 243 ftree_chk(void) 244 #else 245 void 246 ftree_chk() 247 #endif 248 { 249 register FTREE *ft; 250 register int wban = 0; 251 252 /* 253 * make sure all dir access times were reset. 254 */ 255 if (tflag) 256 atdir_end(); 257 258 /* 259 * walk down list and check reference count. Print out those members 260 * that never had a match 261 */ 262 for (ft = fthead; ft != NULL; ft = ft->fow) { 263 if (ft->refcnt > 0) 264 continue; 265 if (wban == 0) { 266 warn(1,"WARNING! These file names were not selected:"); 267 ++wban; 268 } 269 (void)fprintf(stderr, "%s\n", ft->fname); 270 } 271 } 272 273 /* 274 * ftree_arg() 275 * Get the next file arg for fts to process. Can be from either the linked 276 * list or read from stdin when the user did not them as args to pax. Each 277 * arg is processed until the first successful fts_open(). 278 * Return: 279 * 0 when the next arg is ready to go, -1 if out of file args (or EOF on 280 * stdin). 281 */ 282 283 #if __STDC__ 284 static int 285 ftree_arg(void) 286 #else 287 static int 288 ftree_arg() 289 #endif 290 { 291 register char *pt; 292 293 /* 294 * close off the current file tree 295 */ 296 if (ftsp != NULL) { 297 (void)fts_close(ftsp); 298 ftsp = NULL; 299 } 300 301 /* 302 * keep looping until we get a valid file tree to process. Stop when we 303 * reach the end of the list (or get an eof on stdin) 304 */ 305 for(;;) { 306 if (fthead == NULL) { 307 /* 308 * the user didn't supply any args, get the file trees 309 * to process from stdin; 310 */ 311 if (fgets(farray[0], PAXPATHLEN+1, stdin) == NULL) 312 return(-1); 313 if ((pt = strchr(farray[0], '\n')) != NULL) 314 *pt = '\0'; 315 } else { 316 /* 317 * the user supplied the file args as arguements to pax 318 */ 319 if (ftcur == NULL) 320 ftcur = fthead; 321 else if ((ftcur = ftcur->fow) == NULL) 322 return(-1); 323 farray[0] = ftcur->fname; 324 } 325 326 /* 327 * watch it, fts wants the file arg stored in a array of char 328 * ptrs, with the last one a null. we use a two element array 329 * and set farray[0] to point at the buffer with the file name 330 * in it. We cannnot pass all the file args to fts at one shot 331 * as we need to keep a handle on which file arg generates what 332 * files (the -n and -d flags need this). If the open is 333 * successful, return a 0. 334 */ 335 if ((ftsp = fts_open(farray, ftsopts, NULL)) != NULL) 336 break; 337 } 338 return(0); 339 } 340 341 /* 342 * next_file() 343 * supplies the next file to process in the supplied archd structure. 344 * Return: 345 * 0 when contents of arcn have been set with the next file, -1 when done. 346 */ 347 348 #if __STDC__ 349 int 350 next_file(register ARCHD *arcn) 351 #else 352 int 353 next_file(arcn) 354 register ARCHD *arcn; 355 #endif 356 { 357 register int cnt; 358 time_t atime; 359 time_t mtime; 360 361 /* 362 * ftree_sel() might have set the ftree_skip flag if the user has the 363 * -n option and a file was selected from this file arg tree. (-n says 364 * only one member is matched for each pattern) ftree_skip being 1 365 * forces us to go to the next arg now. 366 */ 367 if (ftree_skip) { 368 /* 369 * clear and go to next arg 370 */ 371 ftree_skip = 0; 372 if (ftree_arg() < 0) 373 return(-1); 374 } 375 376 /* 377 * loop until we get a valid file to process 378 */ 379 for(;;) { 380 if ((ftent = fts_read(ftsp)) == NULL) { 381 /* 382 * out of files in this tree, go to next arg, if none 383 * we are done 384 */ 385 if (ftree_arg() < 0) 386 return(-1); 387 continue; 388 } 389 390 /* 391 * handle each type of fts_read() flag 392 */ 393 switch(ftent->fts_info) { 394 case FTS_D: 395 case FTS_DEFAULT: 396 case FTS_F: 397 case FTS_SL: 398 case FTS_SLNONE: 399 /* 400 * these are all ok 401 */ 402 break; 403 case FTS_DP: 404 /* 405 * already saw this directory. If the user wants file 406 * access times reset, we use this to restore the 407 * access time for this directory since this is the 408 * last time we will see it in this file subtree 409 * remember to force the time (this is -t on a read 410 * directory, not a created directory). 411 */ 412 # ifdef NET2_FTS 413 if (!tflag || (get_atdir(ftent->fts_statb.st_dev, 414 ftent->fts_statb.st_ino, &mtime, &atime) < 0)) 415 # else 416 if (!tflag || (get_atdir(ftent->fts_statp->st_dev, 417 ftent->fts_statp->st_ino, &mtime, &atime) < 0)) 418 # endif 419 continue; 420 set_ftime(ftent->fts_path, mtime, atime, 1); 421 continue; 422 case FTS_DC: 423 /* 424 * fts claims a file system cycle 425 */ 426 warn(1,"File system cycle found at %s",ftent->fts_path); 427 continue; 428 case FTS_DNR: 429 # ifdef NET2_FTS 430 syswarn(1, errno, 431 # else 432 syswarn(1, ftent->fts_errno, 433 # endif 434 "Unable to read directory %s", ftent->fts_path); 435 continue; 436 case FTS_ERR: 437 # ifdef NET2_FTS 438 syswarn(1, errno, 439 # else 440 syswarn(1, ftent->fts_errno, 441 # endif 442 "File system traversal error"); 443 continue; 444 case FTS_NS: 445 case FTS_NSOK: 446 # ifdef NET2_FTS 447 syswarn(1, errno, 448 # else 449 syswarn(1, ftent->fts_errno, 450 # endif 451 "Unable to access %s", ftent->fts_path); 452 continue; 453 } 454 455 /* 456 * ok got a file tree node to process. copy info into arcn 457 * structure (initialize as required) 458 */ 459 arcn->skip = 0; 460 arcn->pad = 0; 461 arcn->ln_nlen = 0; 462 arcn->ln_name[0] = '\0'; 463 # ifdef NET2_FTS 464 arcn->sb = ftent->fts_statb; 465 # else 466 arcn->sb = *(ftent->fts_statp); 467 # endif 468 469 /* 470 * file type based set up and copy into the arcn struct 471 * SIDE NOTE: 472 * we try to reset the access time on all files and directories 473 * we may read when the -t flag is specified. files are reset 474 * when we close them after copying. we reset the directories 475 * when we are done with their file tree (we also clean up at 476 * end in case we cut short a file tree traversal). However 477 * there is no way to reset access times on symlinks. 478 */ 479 switch(S_IFMT & arcn->sb.st_mode) { 480 case S_IFDIR: 481 arcn->type = PAX_DIR; 482 if (!tflag) 483 break; 484 add_atdir(ftent->fts_path, arcn->sb.st_dev, 485 arcn->sb.st_ino, arcn->sb.st_mtime, 486 arcn->sb.st_atime); 487 break; 488 case S_IFCHR: 489 arcn->type = PAX_CHR; 490 break; 491 case S_IFBLK: 492 arcn->type = PAX_BLK; 493 break; 494 case S_IFREG: 495 /* 496 * only regular files with have data to store on the 497 * archive. all others will store a zero length skip. 498 * the skip field is used by pax for actual data it has 499 * to read (or skip over). 500 */ 501 arcn->type = PAX_REG; 502 arcn->skip = arcn->sb.st_size; 503 break; 504 case S_IFLNK: 505 arcn->type = PAX_SLK; 506 /* 507 * have to read the symlink path from the file 508 */ 509 if ((cnt = readlink(ftent->fts_path, arcn->ln_name, 510 PAXPATHLEN)) < 0) { 511 syswarn(1, errno, "Unable to read symlink %s", 512 ftent->fts_path); 513 continue; 514 } 515 /* 516 * set link name length, watch out readlink does not 517 * allways null terminate the link path 518 */ 519 arcn->ln_name[cnt] = '\0'; 520 arcn->ln_nlen = cnt; 521 break; 522 case S_IFSOCK: 523 /* 524 * under BSD storing a socket is senseless but we will 525 * let the format specific write function make the 526 * decision of what to do with it. 527 */ 528 arcn->type = PAX_SCK; 529 break; 530 case S_IFIFO: 531 arcn->type = PAX_FIF; 532 break; 533 } 534 break; 535 } 536 537 /* 538 * copy file name, set file name length 539 */ 540 arcn->nlen = l_strncpy(arcn->name, ftent->fts_path, PAXPATHLEN+1); 541 arcn->name[arcn->nlen] = '\0'; 542 arcn->org_name = ftent->fts_path; 543 return(0); 544 } 545