1/* $OpenBSD: pax.c,v 1.28 2005/08/04 10:02:44 mpf Exp $ */ 2/* $NetBSD: pax.c,v 1.5 1996/03/26 23:54:20 mrg Exp $ */ 3 4/*- 5 * Copyright (c) 1992 Keith Muller. 6 * Copyright (c) 1992, 1993 7 * The Regents of the University of California. All rights reserved. 8 * 9 * This code is derived from software contributed to Berkeley by 10 * Keith Muller of the University of California, San Diego. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. 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 38static const char copyright[] = 39"@(#) Copyright (c) 1992, 1993\n\ 40 The Regents of the University of California. All rights reserved.\n"; 41#endif /* not lint */ 42 43#ifndef lint 44#if 0 45static const char sccsid[] = "@(#)pax.c 8.2 (Berkeley) 4/18/94"; 46#else 47static const char rcsid[] = "$OpenBSD: pax.c,v 1.28 2005/08/04 10:02:44 mpf Exp $"; 48#endif 49#endif /* not lint */ 50 51#include <stdio.h> 52#include <sys/types.h> 53#include <sys/param.h> 54#include <sys/stat.h> 55#include <sys/time.h> 56#include <sys/resource.h> 57#include <signal.h> 58#include <unistd.h> 59#include <stdlib.h> 60#include <string.h> 61#include <errno.h> 62#include <err.h> 63#include <fcntl.h> 64#include <paths.h> 65#include "pax.h" 66#include "extern.h" 67static int gen_init(void); 68 69/* 70 * PAX main routines, general globals and some simple start up routines 71 */ 72 73/* 74 * Variables that can be accessed by any routine within pax 75 */ 76int act = DEFOP; /* read/write/append/copy */ 77FSUB *frmt = NULL; /* archive format type */ 78int cflag; /* match all EXCEPT pattern/file */ 79int cwdfd; /* starting cwd */ 80int dflag; /* directory member match only */ 81int iflag; /* interactive file/archive rename */ 82int kflag; /* do not overwrite existing files */ 83int lflag; /* use hard links when possible */ 84int nflag; /* select first archive member match */ 85int tflag; /* restore access time after read */ 86int uflag; /* ignore older modification time files */ 87int vflag; /* produce verbose output */ 88int Dflag; /* same as uflag except inode change time */ 89int Hflag; /* follow command line symlinks (write only) */ 90int Lflag; /* follow symlinks when writing */ 91int Xflag; /* archive files with same device id only */ 92int Yflag; /* same as Dflag except after name mode */ 93int Zflag; /* same as uflag except after name mode */ 94int zeroflag; /* use \0 as pathname terminator */ 95int vfpart; /* is partial verbose output in progress */ 96int patime = 1; /* preserve file access time */ 97int pmtime = 1; /* preserve file modification times */ 98int nodirs; /* do not create directories as needed */ 99int pmode; /* preserve file mode bits */ 100int pids; /* preserve file uid/gid */ 101int rmleadslash = 0; /* remove leading '/' from pathnames */ 102int secure = 1; /* don't extract names that contain .. */ 103int exit_val; /* exit value */ 104int docrc; /* check/create file crc */ 105char *dirptr; /* destination dir in a copy */ 106char *ltmfrmt; /* -v locale time format (if any) */ 107char *argv0; /* root of argv[0] */ 108sigset_t s_mask; /* signal mask for cleanup critical sect */ 109FILE *listf; /* file pointer to print file list to */ 110char *tempfile; /* tempfile to use for mkstemp(3) */ 111char *tempbase; /* basename of tempfile to use for mkstemp(3) */ 112 113/* 114 * PAX - Portable Archive Interchange 115 * 116 * A utility to read, write, and write lists of the members of archive 117 * files and copy directory hierarchies. A variety of archive formats 118 * are supported (some are described in POSIX 1003.1 10.1): 119 * 120 * ustar - 10.1.1 extended tar interchange format 121 * cpio - 10.1.2 extended cpio interchange format 122 * tar - old BSD 4.3 tar format 123 * binary cpio - old cpio with binary header format 124 * sysVR4 cpio - with and without CRC 125 * 126 * This version is a superset of IEEE Std 1003.2b-d3 127 * 128 * Summary of Extensions to the IEEE Standard: 129 * 130 * 1 READ ENHANCEMENTS 131 * 1.1 Operations which read archives will continue to operate even when 132 * processing archives which may be damaged, truncated, or fail to meet 133 * format specs in several different ways. Damaged sections of archives 134 * are detected and avoided if possible. Attempts will be made to resync 135 * archive read operations even with badly damaged media. 136 * 1.2 Blocksize requirements are not strictly enforced on archive read. 137 * Tapes which have variable sized records can be read without errors. 138 * 1.3 The user can specify via the non-standard option flag -E if error 139 * resync operation should stop on a media error, try a specified number 140 * of times to correct, or try to correct forever. 141 * 1.4 Sparse files (lseek holes) stored on the archive (but stored with blocks 142 * of all zeros will be restored with holes appropriate for the target 143 * filesystem 144 * 1.5 The user is notified whenever something is found during archive 145 * read operations which violates spec (but the read will continue). 146 * 1.6 Multiple archive volumes can be read and may span over different 147 * archive devices 148 * 1.7 Rigidly restores all file attributes exactly as they are stored on the 149 * archive. 150 * 1.8 Modification change time ranges can be specified via multiple -T 151 * options. These allow a user to select files whose modification time 152 * lies within a specific time range. 153 * 1.9 Files can be selected based on owner (user name or uid) via one or more 154 * -U options. 155 * 1.10 Files can be selected based on group (group name or gid) via one o 156 * more -G options. 157 * 1.11 File modification time can be checked against existing file after 158 * name modification (-Z) 159 * 160 * 2 WRITE ENHANCEMENTS 161 * 2.1 Write operation will stop instead of allowing a user to create a flawed 162 * flawed archive (due to any problem). 163 * 2.2 Archives written by pax are forced to strictly conform to both the 164 * archive and pax the specific format specifications. 165 * 2.3 Blocking size and format is rigidly enforced on writes. 166 * 2.4 Formats which may exhibit header overflow problems (they have fields 167 * too small for large file systems, such as inode number storage), use 168 * routines designed to repair this problem. These techniques still 169 * conform to both pax and format specifications, but no longer truncate 170 * these fields. This removes any restrictions on using these archive 171 * formats on large file systems. 172 * 2.5 Multiple archive volumes can be written and may span over different 173 * archive devices 174 * 2.6 A archive volume record limit allows the user to specify the number 175 * of bytes stored on an archive volume. When reached the user is 176 * prompted for the next archive volume. This is specified with the 177 * non-standard -B flag. The limit is rounded up to the next blocksize. 178 * 2.7 All archive padding during write use zero filled sections. This makes 179 * it much easier to pull data out of flawed archive during read 180 * operations. 181 * 2.8 Access time reset with the -t applies to all file nodes (including 182 * directories). 183 * 2.9 Symbolic links can be followed with -L (optional in the spec). 184 * 2.10 Modification or inode change time ranges can be specified via 185 * multiple -T options. These allow a user to select files whose 186 * modification or inode change time lies within a specific time range. 187 * 2.11 Files can be selected based on owner (user name or uid) via one or more 188 * -U options. 189 * 2.12 Files can be selected based on group (group name or gid) via one o 190 * more -G options. 191 * 2.13 Symlinks which appear on the command line can be followed (without 192 * following other symlinks; -H flag) 193 * 194 * 3 COPY ENHANCEMENTS 195 * 3.1 Sparse files (lseek holes) can be copied without expanding the holes 196 * into zero filled blocks. The file copy is created with holes which are 197 * appropriate for the target filesystem 198 * 3.2 Access time as well as modification time on copied file trees can be 199 * preserved with the appropriate -p options. 200 * 3.3 Access time reset with the -t applies to all file nodes (including 201 * directories). 202 * 3.4 Symbolic links can be followed with -L (optional in the spec). 203 * 3.5 Modification or inode change time ranges can be specified via 204 * multiple -T options. These allow a user to select files whose 205 * modification or inode change time lies within a specific time range. 206 * 3.6 Files can be selected based on owner (user name or uid) via one or more 207 * -U options. 208 * 3.7 Files can be selected based on group (group name or gid) via one o 209 * more -G options. 210 * 3.8 Symlinks which appear on the command line can be followed (without 211 * following other symlinks; -H flag) 212 * 3.9 File inode change time can be checked against existing file before 213 * name modification (-D) 214 * 3.10 File inode change time can be checked against existing file after 215 * name modification (-Y) 216 * 3.11 File modification time can be checked against existing file after 217 * name modification (-Z) 218 * 219 * 4 GENERAL ENHANCEMENTS 220 * 4.1 Internal structure is designed to isolate format dependent and 221 * independent functions. Formats are selected via a format driver table. 222 * This encourages the addition of new archive formats by only having to 223 * write those routines which id, read and write the archive header. 224 */ 225 226/* 227 * main() 228 * parse options, set up and operate as specified by the user. 229 * any operational flaw will set exit_val to non-zero 230 * Return: 0 if ok, 1 otherwise 231 */ 232 233int 234main(int argc, char **argv) 235{ 236 char *tmpdir; 237 size_t tdlen; 238 239 listf = stderr; 240 /* 241 * Keep a reference to cwd, so we can always come back home. 242 */ 243 cwdfd = open(".", O_RDONLY); 244 if (cwdfd < 0) { 245 syswarn(1, errno, "Can't open current working directory."); 246 return(exit_val); 247 } 248 249 if (updatepath() == -1) 250 return exit_val; 251 /* 252 * Where should we put temporary files? 253 */ 254 if ((tmpdir = getenv("TMPDIR")) == NULL || *tmpdir == '\0') 255 tmpdir = _PATH_TMP; 256 tdlen = strlen(tmpdir); 257 while (tdlen > 0 && tmpdir[tdlen - 1] == '/') 258 tdlen--; 259 tempfile = malloc(tdlen + 1 + sizeof(_TFILE_BASE)); 260 if (tempfile == NULL) { 261 paxwarn(1, "Cannot allocate memory for temp file name."); 262 return(exit_val); 263 } 264 if (tdlen) 265 memcpy(tempfile, tmpdir, tdlen); 266 tempbase = tempfile + tdlen; 267 *tempbase++ = '/'; 268 269 /* 270 * parse options, determine operational mode, general init 271 */ 272 options(argc, argv); 273 if ((gen_init() < 0) || (tty_init() < 0)) 274 return(exit_val); 275 276 /* 277 * select a primary operation mode 278 */ 279 switch (act) { 280 case EXTRACT: 281 extract(); 282 break; 283 case ARCHIVE: 284 archive(); 285 break; 286 case APPND: 287 if (gzip_program != NULL) 288 errx(1, "can not gzip while appending"); 289 append(); 290 break; 291 case COPY: 292 copy(); 293 break; 294 default: 295 case LIST: 296 list(); 297 break; 298 } 299 return(exit_val); 300} 301 302/* 303 * sig_cleanup() 304 * when interrupted we try to do whatever delayed processing we can. 305 * This is not critical, but we really ought to limit our damage when we 306 * are aborted by the user. 307 * Return: 308 * never.... 309 */ 310 311void 312sig_cleanup(int which_sig) 313{ 314 /* XXX signal races */ 315 316 /* 317 * restore modes and times for any dirs we may have created 318 * or any dirs we may have read. Set vflag and vfpart so the user 319 * will clearly see the message on a line by itself. 320 */ 321 vflag = vfpart = 1; 322 if (which_sig == SIGXCPU) 323 paxwarn(0, "Cpu time limit reached, cleaning up."); 324 else 325 paxwarn(0, "Signal caught, cleaning up."); 326 327 ar_close(); 328 proc_dir(); 329 if (tflag) 330 atdir_end(); 331 exit(1); 332} 333 334/* 335 * gen_init() 336 * general setup routines. Not all are required, but they really help 337 * when dealing with a medium to large sized archives. 338 */ 339 340static int 341gen_init(void) 342{ 343 struct rlimit reslimit; 344 struct sigaction n_hand; 345 struct sigaction o_hand; 346 347 /* 348 * Really needed to handle large archives. We can run out of memory for 349 * internal tables really fast when we have a whole lot of files... 350 */ 351 if (getrlimit(RLIMIT_DATA , &reslimit) == 0){ 352 reslimit.rlim_cur = reslimit.rlim_max; 353 (void)setrlimit(RLIMIT_DATA , &reslimit); 354 } 355 356 /* 357 * should file size limits be waived? if the os limits us, this is 358 * needed if we want to write a large archive 359 */ 360 if (getrlimit(RLIMIT_FSIZE , &reslimit) == 0){ 361 reslimit.rlim_cur = reslimit.rlim_max; 362 (void)setrlimit(RLIMIT_FSIZE , &reslimit); 363 } 364 365 /* 366 * increase the size the stack can grow to 367 */ 368 if (getrlimit(RLIMIT_STACK , &reslimit) == 0){ 369 reslimit.rlim_cur = reslimit.rlim_max; 370 (void)setrlimit(RLIMIT_STACK , &reslimit); 371 } 372 373 /* 374 * not really needed, but doesn't hurt 375 */ 376 if (getrlimit(RLIMIT_RSS , &reslimit) == 0){ 377 reslimit.rlim_cur = reslimit.rlim_max; 378 (void)setrlimit(RLIMIT_RSS , &reslimit); 379 } 380 381 /* 382 * Handle posix locale 383 * 384 * set user defines time printing format for -v option 385 */ 386 ltmfrmt = getenv("LC_TIME"); 387 388 /* 389 * signal handling to reset stored directory times and modes. Since 390 * we deal with broken pipes via failed writes we ignore it. We also 391 * deal with any file size limit through failed writes. Cpu time 392 * limits are caught and a cleanup is forced. 393 */ 394 if ((sigemptyset(&s_mask) < 0) || (sigaddset(&s_mask, SIGTERM) < 0) || 395 (sigaddset(&s_mask,SIGINT) < 0)||(sigaddset(&s_mask,SIGHUP) < 0) || 396 (sigaddset(&s_mask,SIGPIPE) < 0)||(sigaddset(&s_mask,SIGQUIT)<0) || 397 (sigaddset(&s_mask,SIGXCPU) < 0)||(sigaddset(&s_mask,SIGXFSZ)<0)) { 398 paxwarn(1, "Unable to set up signal mask"); 399 return(-1); 400 } 401 memset(&n_hand, 0, sizeof n_hand); 402 n_hand.sa_mask = s_mask; 403 n_hand.sa_flags = 0; 404 n_hand.sa_handler = sig_cleanup; 405 406 if ((sigaction(SIGHUP, &n_hand, &o_hand) < 0) && 407 (o_hand.sa_handler == SIG_IGN) && 408 (sigaction(SIGHUP, &o_hand, &o_hand) < 0)) 409 goto out; 410 411 if ((sigaction(SIGTERM, &n_hand, &o_hand) < 0) && 412 (o_hand.sa_handler == SIG_IGN) && 413 (sigaction(SIGTERM, &o_hand, &o_hand) < 0)) 414 goto out; 415 416 if ((sigaction(SIGINT, &n_hand, &o_hand) < 0) && 417 (o_hand.sa_handler == SIG_IGN) && 418 (sigaction(SIGINT, &o_hand, &o_hand) < 0)) 419 goto out; 420 421 if ((sigaction(SIGQUIT, &n_hand, &o_hand) < 0) && 422 (o_hand.sa_handler == SIG_IGN) && 423 (sigaction(SIGQUIT, &o_hand, &o_hand) < 0)) 424 goto out; 425 426 if ((sigaction(SIGXCPU, &n_hand, &o_hand) < 0) && 427 (o_hand.sa_handler == SIG_IGN) && 428 (sigaction(SIGXCPU, &o_hand, &o_hand) < 0)) 429 goto out; 430 431 n_hand.sa_handler = SIG_IGN; 432 if ((sigaction(SIGPIPE, &n_hand, &o_hand) < 0) || 433 (sigaction(SIGXFSZ, &n_hand, &o_hand) < 0)) 434 goto out; 435 return(0); 436 437 out: 438 syswarn(1, errno, "Unable to set up signal handler"); 439 return(-1); 440} 441