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 * %sccs.include.redist.c% 10 */ 11 12 #ifndef lint 13 static char sccsid[] = "@(#)ftree.c 8.2 (Berkeley) 04/18/94"; 14 #endif /* not lint */ 15 16 #include <sys/types.h> 17 #include <sys/time.h> 18 #include <sys/stat.h> 19 #include <sys/param.h> 20 #include <unistd.h> 21 #include <string.h> 22 #include <stdio.h> 23 #include <ctype.h> 24 #include <errno.h> 25 #include <stdlib.h> 26 #include <fts.h> 27 #include "pax.h" 28 #include "ftree.h" 29 #include "extern.h" 30 31 /* 32 * routines to interface with the fts library function. 33 * 34 * file args supplied to pax are stored on a single linked list (of type FTREE) 35 * and given to fts to be processed one at a time. pax "selects" files from 36 * the expansion of each arg into the corresponding file tree (if the arg is a 37 * directory, otherwise the node itself is just passed to pax). The selection 38 * is modified by the -n and -u flags. The user is informed when a specific 39 * file arg does not generate any selected files. -n keeps expanding the file 40 * tree arg until one of its files is selected, then skips to the next file 41 * arg. when the user does not supply the file trees as command line args to 42 * pax, they are read from stdin 43 */ 44 45 static FTS *ftsp = NULL; /* curent FTS handle */ 46 static int ftsopts; /* options to be used on fts_open */ 47 static char *farray[2]; /* array for passing each arg to fts */ 48 static FTREE *fthead = NULL; /* head of linked list of file args */ 49 static FTREE *fttail = NULL; /* tail of linked list of file args */ 50 static FTREE *ftcur = NULL; /* current file arg being processed */ 51 static FTSENT *ftent = NULL; /* current file tree entry */ 52 static int ftree_skip; /* when set skip to next file arg */ 53 54 static int ftree_arg __P((void)); 55 56 /* 57 * ftree_start() 58 * initialize the options passed to fts_open() during this run of pax 59 * options are based on the selection of pax options by the user 60 * fts_start() also calls fts_arg() to open the first valid file arg. We 61 * also attempt to reset directory access times when -t (tflag) is set. 62 * Return: 63 * 0 if there is at least one valid file arg to process, -1 otherwise 64 */ 65 66 #if __STDC__ 67 int 68 ftree_start(void) 69 #else 70 int 71 ftree_start() 72 #endif 73 { 74 /* 75 * set up the operation mode of fts, open the first file arg. We must 76 * use FTS_NOCHDIR, as the user may have to open multiple archives and 77 * if fts did a chdir off into the boondocks, we may create an archive 78 * volume in an place where the user did not expect to. 79 */ 80 ftsopts = FTS_NOCHDIR; 81 82 /* 83 * optional user flags that effect file traversal 84 * -H command line symlink follow only (half follow) 85 * -L follow sylinks (logical) 86 * -P do not follow sylinks (physical). This is the default. 87 * -X do not cross over mount points 88 * -t preserve access times on files read. 89 * -n select only the first member of a file tree when a match is found 90 * -d do not extract subtrees rooted at a directory arg. 91 */ 92 if (Lflag) 93 ftsopts |= FTS_LOGICAL; 94 else 95 ftsopts |= FTS_PHYSICAL; 96 if (Hflag) 97 # ifdef NET2_FTS 98 warn(0, "The -H flag is not supported on this version"); 99 # else 100 ftsopts |= FTS_COMFOLLOW; 101 # endif 102 if (Xflag) 103 ftsopts |= FTS_XDEV; 104 105 if ((fthead == NULL) && ((farray[0] = malloc(PAXPATHLEN+2)) == NULL)) { 106 warn(1, "Unable to allocate memory for file name buffer"); 107 return(-1); 108 } 109 110 if (ftree_arg() < 0) 111 return(-1); 112 if (tflag && (atdir_start() < 0)) 113 return(-1); 114 return(0); 115 } 116 117 /* 118 * ftree_add() 119 * add the arg to the linked list of files to process. Each will be 120 * processed by fts one at a time 121 * Return: 122 * 0 if added to the linked list, -1 if failed 123 */ 124 125 #if __STDC__ 126 int 127 ftree_add(register char *str) 128 #else 129 int 130 ftree_add(str) 131 register char *str; 132 #endif 133 { 134 register FTREE *ft; 135 register int len; 136 137 /* 138 * simple check for bad args 139 */ 140 if ((str == NULL) || (*str == '\0')) { 141 warn(0, "Invalid file name arguement"); 142 return(-1); 143 } 144 145 /* 146 * allocate FTREE node and add to the end of the linked list (args are 147 * processed in the same order they were passed to pax). Get rid of any 148 * trailing / the user may pass us. (watch out for / by itself). 149 */ 150 if ((ft = (FTREE *)malloc(sizeof(FTREE))) == NULL) { 151 warn(0, "Unable to allocate memory for filename"); 152 return(-1); 153 } 154 155 if (((len = strlen(str) - 1) > 0) && (str[len] == '/')) 156 str[len] = '\0'; 157 ft->fname = str; 158 ft->refcnt = 0; 159 ft->fow = NULL; 160 if (fthead == NULL) { 161 fttail = fthead = ft; 162 return(0); 163 } 164 fttail->fow = ft; 165 fttail = ft; 166 return(0); 167 } 168 169 /* 170 * ftree_sel() 171 * this entry has been selected by pax. bump up reference count and handle 172 * -n and -d processing. 173 */ 174 175 #if __STDC__ 176 void 177 ftree_sel(register ARCHD *arcn) 178 #else 179 void 180 ftree_sel(arcn) 181 register ARCHD *arcn; 182 #endif 183 { 184 /* 185 * set reference bit for this pattern. This linked list is only used 186 * when file trees are supplied pax as args. The list is not used when 187 * the trees are read from stdin. 188 */ 189 if (ftcur != NULL) 190 ftcur->refcnt = 1; 191 192 /* 193 * if -n we are done with this arg, force a skip to the next arg when 194 * pax asks for the next file in next_file(). 195 * if -d we tell fts only to match the directory (if the arg is a dir) 196 * and not the entire file tree rooted at that point. 197 */ 198 if (nflag) 199 ftree_skip = 1; 200 201 if (!dflag || (arcn->type != PAX_DIR)) 202 return; 203 204 if (ftent != NULL) 205 (void)fts_set(ftsp, ftent, FTS_SKIP); 206 } 207 208 /* 209 * ftree_chk() 210 * called at end on pax execution. Prints all those file args that did not 211 * have a selected member (reference count still 0) 212 */ 213 214 #if __STDC__ 215 void 216 ftree_chk(void) 217 #else 218 void 219 ftree_chk() 220 #endif 221 { 222 register FTREE *ft; 223 register int wban = 0; 224 225 /* 226 * make sure all dir access times were reset. 227 */ 228 if (tflag) 229 atdir_end(); 230 231 /* 232 * walk down list and check reference count. Print out those members 233 * that never had a match 234 */ 235 for (ft = fthead; ft != NULL; ft = ft->fow) { 236 if (ft->refcnt > 0) 237 continue; 238 if (wban == 0) { 239 warn(1,"WARNING! These file names were not selected:"); 240 ++wban; 241 } 242 (void)fprintf(stderr, "%s\n", ft->fname); 243 } 244 } 245 246 /* 247 * ftree_arg() 248 * Get the next file arg for fts to process. Can be from either the linked 249 * list or read from stdin when the user did not them as args to pax. Each 250 * arg is processed until the first successful fts_open(). 251 * Return: 252 * 0 when the next arg is ready to go, -1 if out of file args (or EOF on 253 * stdin). 254 */ 255 256 #if __STDC__ 257 static int 258 ftree_arg(void) 259 #else 260 static int 261 ftree_arg() 262 #endif 263 { 264 register char *pt; 265 266 /* 267 * close off the current file tree 268 */ 269 if (ftsp != NULL) { 270 (void)fts_close(ftsp); 271 ftsp = NULL; 272 } 273 274 /* 275 * keep looping until we get a valid file tree to process. Stop when we 276 * reach the end of the list (or get an eof on stdin) 277 */ 278 for(;;) { 279 if (fthead == NULL) { 280 /* 281 * the user didn't supply any args, get the file trees 282 * to process from stdin; 283 */ 284 if (fgets(farray[0], PAXPATHLEN+1, stdin) == NULL) 285 return(-1); 286 if ((pt = strchr(farray[0], '\n')) != NULL) 287 *pt = '\0'; 288 } else { 289 /* 290 * the user supplied the file args as arguements to pax 291 */ 292 if (ftcur == NULL) 293 ftcur = fthead; 294 else if ((ftcur = ftcur->fow) == NULL) 295 return(-1); 296 farray[0] = ftcur->fname; 297 } 298 299 /* 300 * watch it, fts wants the file arg stored in a array of char 301 * ptrs, with the last one a null. we use a two element array 302 * and set farray[0] to point at the buffer with the file name 303 * in it. We cannnot pass all the file args to fts at one shot 304 * as we need to keep a handle on which file arg generates what 305 * files (the -n and -d flags need this). If the open is 306 * successful, return a 0. 307 */ 308 if ((ftsp = fts_open(farray, ftsopts, NULL)) != NULL) 309 break; 310 } 311 return(0); 312 } 313 314 /* 315 * next_file() 316 * supplies the next file to process in the supplied archd structure. 317 * Return: 318 * 0 when contents of arcn have been set with the next file, -1 when done. 319 */ 320 321 #if __STDC__ 322 int 323 next_file(register ARCHD *arcn) 324 #else 325 int 326 next_file(arcn) 327 register ARCHD *arcn; 328 #endif 329 { 330 register int cnt; 331 time_t atime; 332 time_t mtime; 333 334 /* 335 * ftree_sel() might have set the ftree_skip flag if the user has the 336 * -n option and a file was selected from this file arg tree. (-n says 337 * only one member is matched for each pattern) ftree_skip being 1 338 * forces us to go to the next arg now. 339 */ 340 if (ftree_skip) { 341 /* 342 * clear and go to next arg 343 */ 344 ftree_skip = 0; 345 if (ftree_arg() < 0) 346 return(-1); 347 } 348 349 /* 350 * loop until we get a valid file to process 351 */ 352 for(;;) { 353 if ((ftent = fts_read(ftsp)) == NULL) { 354 /* 355 * out of files in this tree, go to next arg, if none 356 * we are done 357 */ 358 if (ftree_arg() < 0) 359 return(-1); 360 continue; 361 } 362 363 /* 364 * handle each type of fts_read() flag 365 */ 366 switch(ftent->fts_info) { 367 case FTS_D: 368 case FTS_DEFAULT: 369 case FTS_F: 370 case FTS_SL: 371 case FTS_SLNONE: 372 /* 373 * these are all ok 374 */ 375 break; 376 case FTS_DP: 377 /* 378 * already saw this directory. If the user wants file 379 * access times reset, we use this to restore the 380 * access time for this directory since this is the 381 * last time we will see it in this file subtree 382 * remember to force the time (this is -t on a read 383 * directory, not a created directory). 384 */ 385 # ifdef NET2_FTS 386 if (!tflag || (get_atdir(ftent->fts_statb.st_dev, 387 ftent->fts_statb.st_ino, &mtime, &atime) < 0)) 388 # else 389 if (!tflag || (get_atdir(ftent->fts_statp->st_dev, 390 ftent->fts_statp->st_ino, &mtime, &atime) < 0)) 391 # endif 392 continue; 393 set_ftime(ftent->fts_path, mtime, atime, 1); 394 continue; 395 case FTS_DC: 396 /* 397 * fts claims a file system cycle 398 */ 399 warn(1,"File system cycle found at %s",ftent->fts_path); 400 continue; 401 case FTS_DNR: 402 # ifdef NET2_FTS 403 syswarn(1, errno, 404 # else 405 syswarn(1, ftent->fts_errno, 406 # endif 407 "Unable to read directory %s", ftent->fts_path); 408 continue; 409 case FTS_ERR: 410 # ifdef NET2_FTS 411 syswarn(1, errno, 412 # else 413 syswarn(1, ftent->fts_errno, 414 # endif 415 "File system traversal error"); 416 continue; 417 case FTS_NS: 418 case FTS_NSOK: 419 # ifdef NET2_FTS 420 syswarn(1, errno, 421 # else 422 syswarn(1, ftent->fts_errno, 423 # endif 424 "Unable to access %s", ftent->fts_path); 425 continue; 426 } 427 428 /* 429 * ok got a file tree node to process. copy info into arcn 430 * structure (initialize as required) 431 */ 432 arcn->skip = 0; 433 arcn->pad = 0; 434 arcn->ln_nlen = 0; 435 arcn->ln_name[0] = '\0'; 436 # ifdef NET2_FTS 437 arcn->sb = ftent->fts_statb; 438 # else 439 arcn->sb = *(ftent->fts_statp); 440 # endif 441 442 /* 443 * file type based set up and copy into the arcn struct 444 * SIDE NOTE: 445 * we try to reset the access time on all files and directories 446 * we may read when the -t flag is specified. files are reset 447 * when we close them after copying. we reset the directories 448 * when we are done with their file tree (we also clean up at 449 * end in case we cut short a file tree traversal). However 450 * there is no way to reset access times on symlinks. 451 */ 452 switch(S_IFMT & arcn->sb.st_mode) { 453 case S_IFDIR: 454 arcn->type = PAX_DIR; 455 if (!tflag) 456 break; 457 add_atdir(ftent->fts_path, arcn->sb.st_dev, 458 arcn->sb.st_ino, arcn->sb.st_mtime, 459 arcn->sb.st_atime); 460 break; 461 case S_IFCHR: 462 arcn->type = PAX_CHR; 463 break; 464 case S_IFBLK: 465 arcn->type = PAX_BLK; 466 break; 467 case S_IFREG: 468 /* 469 * only regular files with have data to store on the 470 * archive. all others will store a zero length skip. 471 * the skip field is used by pax for actual data it has 472 * to read (or skip over). 473 */ 474 arcn->type = PAX_REG; 475 arcn->skip = arcn->sb.st_size; 476 break; 477 case S_IFLNK: 478 arcn->type = PAX_SLK; 479 /* 480 * have to read the symlink path from the file 481 */ 482 if ((cnt = readlink(ftent->fts_path, arcn->ln_name, 483 PAXPATHLEN)) < 0) { 484 syswarn(1, errno, "Unable to read symlink %s", 485 ftent->fts_path); 486 continue; 487 } 488 /* 489 * set link name length, watch out readlink does not 490 * allways null terminate the link path 491 */ 492 arcn->ln_name[cnt] = '\0'; 493 arcn->ln_nlen = cnt; 494 break; 495 case S_IFSOCK: 496 /* 497 * under BSD storing a socket is senseless but we will 498 * let the format specific write function make the 499 * decision of what to do with it. 500 */ 501 arcn->type = PAX_SCK; 502 break; 503 case S_IFIFO: 504 arcn->type = PAX_FIF; 505 break; 506 } 507 break; 508 } 509 510 /* 511 * copy file name, set file name length 512 */ 513 arcn->nlen = l_strncpy(arcn->name, ftent->fts_path, PAXPATHLEN+1); 514 arcn->name[arcn->nlen] = '\0'; 515 arcn->org_name = ftent->fts_path; 516 return(0); 517 } 518