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 * @(#) Copyright (c) 1992, 1993 The Regents of the University of California. All rights reserved. 38 * @(#)pax.c 8.2 (Berkeley) 4/18/94 39 * $FreeBSD: src/bin/pax/pax.c,v 1.13.2.4 2002/11/07 15:29:53 imp Exp $ 40 * $DragonFly: src/bin/pax/pax.c,v 1.6 2006/09/27 21:58:08 pavalos Exp $ 41 */ 42 43 #include <sys/types.h> 44 #include <sys/stat.h> 45 #include <sys/time.h> 46 #include <sys/resource.h> 47 #include <err.h> 48 #include <errno.h> 49 #include <fcntl.h> 50 #include <locale.h> 51 #include <paths.h> 52 #include <signal.h> 53 #include <stdio.h> 54 #include <stdlib.h> 55 #include <string.h> 56 #include <unistd.h> 57 #include "pax.h" 58 #include "extern.h" 59 static int gen_init (void); 60 61 /* 62 * PAX main routines, general globals and some simple start up routines 63 */ 64 65 /* 66 * Variables that can be accessed by any routine within pax 67 */ 68 int act = DEFOP; /* read/write/append/copy */ 69 FSUB *frmt = NULL; /* archive format type */ 70 int cflag; /* match all EXCEPT pattern/file */ 71 int cwdfd; /* starting cwd */ 72 int dflag; /* directory member match only */ 73 int iflag; /* interactive file/archive rename */ 74 int kflag; /* do not overwrite existing files */ 75 int lflag; /* use hard links when possible */ 76 int nflag; /* select first archive member match */ 77 int tflag; /* restore access time after read */ 78 int uflag; /* ignore older modification time files */ 79 int vflag; /* produce verbose output */ 80 int Dflag; /* same as uflag except inode change time */ 81 int Hflag; /* follow command line symlinks (write only) */ 82 int Lflag; /* follow symlinks when writing */ 83 int Xflag; /* archive files with same device id only */ 84 int Yflag; /* same as Dflag except after name mode */ 85 int Zflag; /* same as uflag except after name mode */ 86 int vfpart; /* is partial verbose output in progress */ 87 int patime = 1; /* preserve file access time */ 88 int pmtime = 1; /* preserve file modification times */ 89 int nodirs; /* do not create directories as needed */ 90 int pmode; /* preserve file mode bits */ 91 int pids; /* preserve file uid/gid */ 92 int rmleadslash = 0; /* remove leading '/' from pathnames */ 93 int exit_val; /* exit value */ 94 int docrc; /* check/create file crc */ 95 char *dirptr; /* destination dir in a copy */ 96 char *argv0; /* root of argv[0] */ 97 sigset_t s_mask; /* signal mask for cleanup critical sect */ 98 FILE *listf; /* file pointer to print file list to */ 99 char *tempfile; /* tempfile to use for mkstemp(3) */ 100 char *tempbase; /* basename of tempfile to use for mkstemp(3) */ 101 102 /* 103 * PAX - Portable Archive Interchange 104 * 105 * A utility to read, write, and write lists of the members of archive 106 * files and copy directory hierarchies. A variety of archive formats 107 * are supported (some are described in POSIX 1003.1 10.1): 108 * 109 * ustar - 10.1.1 extended tar interchange format 110 * cpio - 10.1.2 extended cpio interchange format 111 * tar - old BSD 4.3 tar format 112 * binary cpio - old cpio with binary header format 113 * sysVR4 cpio - with and without CRC 114 * 115 * This version is a superset of IEEE Std 1003.2b-d3 116 * 117 * Summary of Extensions to the IEEE Standard: 118 * 119 * 1 READ ENHANCEMENTS 120 * 1.1 Operations which read archives will continue to operate even when 121 * processing archives which may be damaged, truncated, or fail to meet 122 * format specs in several different ways. Damaged sections of archives 123 * are detected and avoided if possible. Attempts will be made to resync 124 * archive read operations even with badly damaged media. 125 * 1.2 Blocksize requirements are not strictly enforced on archive read. 126 * Tapes which have variable sized records can be read without errors. 127 * 1.3 The user can specify via the non-standard option flag -E if error 128 * resync operation should stop on a media error, try a specified number 129 * of times to correct, or try to correct forever. 130 * 1.4 Sparse files (lseek holes) stored on the archive (but stored with blocks 131 * of all zeros will be restored with holes appropriate for the target 132 * filesystem 133 * 1.5 The user is notified whenever something is found during archive 134 * read operations which violates spec (but the read will continue). 135 * 1.6 Multiple archive volumes can be read and may span over different 136 * archive devices 137 * 1.7 Rigidly restores all file attributes exactly as they are stored on the 138 * archive. 139 * 1.8 Modification change time ranges can be specified via multiple -T 140 * options. These allow a user to select files whose modification time 141 * lies within a specific time range. 142 * 1.9 Files can be selected based on owner (user name or uid) via one or more 143 * -U options. 144 * 1.10 Files can be selected based on group (group name or gid) via one o 145 * more -G options. 146 * 1.11 File modification time can be checked against existing file after 147 * name modification (-Z) 148 * 149 * 2 WRITE ENHANCEMENTS 150 * 2.1 Write operation will stop instead of allowing a user to create a flawed 151 * flawed archive (due to any problem). 152 * 2.2 Archives written by pax are forced to strictly conform to both the 153 * archive and pax the specific format specifications. 154 * 2.3 Blocking size and format is rigidly enforced on writes. 155 * 2.4 Formats which may exhibit header overflow problems (they have fields 156 * too small for large file systems, such as inode number storage), use 157 * routines designed to repair this problem. These techniques still 158 * conform to both pax and format specifications, but no longer truncate 159 * these fields. This removes any restrictions on using these archive 160 * formats on large file systems. 161 * 2.5 Multiple archive volumes can be written and may span over different 162 * archive devices 163 * 2.6 A archive volume record limit allows the user to specify the number 164 * of bytes stored on an archive volume. When reached the user is 165 * prompted for the next archive volume. This is specified with the 166 * non-standard -B flag. The limit is rounded up to the next blocksize. 167 * 2.7 All archive padding during write use zero filled sections. This makes 168 * it much easier to pull data out of flawed archive during read 169 * operations. 170 * 2.8 Access time reset with the -t applies to all file nodes (including 171 * directories). 172 * 2.9 Symbolic links can be followed with -L (optional in the spec). 173 * 2.10 Modification or inode change time ranges can be specified via 174 * multiple -T options. These allow a user to select files whose 175 * modification or inode change time lies within a specific time range. 176 * 2.11 Files can be selected based on owner (user name or uid) via one or more 177 * -U options. 178 * 2.12 Files can be selected based on group (group name or gid) via one o 179 * more -G options. 180 * 2.13 Symlinks which appear on the command line can be followed (without 181 * following other symlinks; -H flag) 182 * 183 * 3 COPY ENHANCEMENTS 184 * 3.1 Sparse files (lseek holes) can be copied without expanding the holes 185 * into zero filled blocks. The file copy is created with holes which are 186 * appropriate for the target filesystem 187 * 3.2 Access time as well as modification time on copied file trees can be 188 * preserved with the appropriate -p options. 189 * 3.3 Access time reset with the -t applies to all file nodes (including 190 * directories). 191 * 3.4 Symbolic links can be followed with -L (optional in the spec). 192 * 3.5 Modification or inode change time ranges can be specified via 193 * multiple -T options. These allow a user to select files whose 194 * modification or inode change time lies within a specific time range. 195 * 3.6 Files can be selected based on owner (user name or uid) via one or more 196 * -U options. 197 * 3.7 Files can be selected based on group (group name or gid) via one o 198 * more -G options. 199 * 3.8 Symlinks which appear on the command line can be followed (without 200 * following other symlinks; -H flag) 201 * 3.9 File inode change time can be checked against existing file before 202 * name modification (-D) 203 * 3.10 File inode change time can be checked against existing file after 204 * name modification (-Y) 205 * 3.11 File modification time can be checked against existing file after 206 * name modification (-Z) 207 * 208 * 4 GENERAL ENHANCEMENTS 209 * 4.1 Internal structure is designed to isolate format dependent and 210 * independent functions. Formats are selected via a format driver table. 211 * This encourages the addition of new archive formats by only having to 212 * write those routines which id, read and write the archive header. 213 */ 214 215 /* 216 * main() 217 * parse options, set up and operate as specified by the user. 218 * any operational flaw will set exit_val to non-zero 219 * Return: 0 if ok, 1 otherwise 220 */ 221 222 int 223 main(int argc, char **argv) 224 { 225 char *tmpdir; 226 size_t tdlen; 227 228 setlocale(LC_ALL, ""); 229 listf = stderr; 230 /* 231 * Keep a reference to cwd, so we can always come back home. 232 */ 233 cwdfd = open(".", O_RDONLY); 234 if (cwdfd < 0) { 235 syswarn(0, errno, "Can't open current working directory."); 236 return(exit_val); 237 } 238 239 /* 240 * Where should we put temporary files? 241 */ 242 if ((tmpdir = getenv("TMPDIR")) == NULL || *tmpdir == '\0') 243 tmpdir = _PATH_TMP; 244 tdlen = strlen(tmpdir); 245 while(tdlen > 0 && tmpdir[tdlen - 1] == '/') 246 tdlen--; 247 tempfile = malloc(tdlen + 1 + sizeof(_TFILE_BASE)); 248 if (tempfile == NULL) { 249 paxwarn(1, "Cannot allocate memory for temp file name."); 250 return(exit_val); 251 } 252 if (tdlen) 253 memcpy(tempfile, tmpdir, tdlen); 254 tempbase = tempfile + tdlen; 255 *tempbase++ = '/'; 256 257 /* 258 * parse options, determine operational mode, general init 259 */ 260 options(argc, argv); 261 if ((gen_init() < 0) || (tty_init() < 0)) 262 return(exit_val); 263 264 /* 265 * select a primary operation mode 266 */ 267 switch(act) { 268 case EXTRACT: 269 extract(); 270 break; 271 case ARCHIVE: 272 archive(); 273 break; 274 case APPND: 275 if (gzip_program != NULL) 276 err(1, "can not gzip while appending"); 277 append(); 278 break; 279 case COPY: 280 copy(); 281 break; 282 default: 283 case LIST: 284 list(); 285 break; 286 } 287 return(exit_val); 288 } 289 290 /* 291 * sig_cleanup() 292 * when interrupted we try to do whatever delayed processing we can. 293 * This is not critical, but we really ought to limit our damage when we 294 * are aborted by the user. 295 * Return: 296 * never.... 297 */ 298 299 void 300 sig_cleanup(int which_sig) 301 { 302 /* 303 * restore modes and times for any dirs we may have created 304 * or any dirs we may have read. Set vflag and vfpart so the user 305 * will clearly see the message on a line by itself. 306 */ 307 vflag = vfpart = 1; 308 if (which_sig == SIGXCPU) 309 paxwarn(0, "Cpu time limit reached, cleaning up."); 310 else 311 paxwarn(0, "Signal caught, cleaning up."); 312 313 ar_close(); 314 proc_dir(); 315 if (tflag) 316 atdir_end(); 317 exit(1); 318 } 319 320 /* 321 * gen_init() 322 * general setup routines. Not all are required, but they really help 323 * when dealing with a medium to large sized archives. 324 */ 325 326 static int 327 gen_init(void) 328 { 329 struct rlimit reslimit; 330 struct sigaction n_hand; 331 struct sigaction o_hand; 332 333 /* 334 * Really needed to handle large archives. We can run out of memory for 335 * internal tables really fast when we have a whole lot of files... 336 */ 337 if (getrlimit(RLIMIT_DATA , &reslimit) == 0){ 338 reslimit.rlim_cur = reslimit.rlim_max; 339 setrlimit(RLIMIT_DATA , &reslimit); 340 } 341 342 /* 343 * should file size limits be waived? if the os limits us, this is 344 * needed if we want to write a large archive 345 */ 346 if (getrlimit(RLIMIT_FSIZE , &reslimit) == 0){ 347 reslimit.rlim_cur = reslimit.rlim_max; 348 setrlimit(RLIMIT_FSIZE , &reslimit); 349 } 350 351 /* 352 * increase the size the stack can grow to 353 */ 354 if (getrlimit(RLIMIT_STACK , &reslimit) == 0){ 355 reslimit.rlim_cur = reslimit.rlim_max; 356 setrlimit(RLIMIT_STACK , &reslimit); 357 } 358 359 /* 360 * not really needed, but doesn't hurt 361 */ 362 if (getrlimit(RLIMIT_RSS , &reslimit) == 0){ 363 reslimit.rlim_cur = reslimit.rlim_max; 364 setrlimit(RLIMIT_RSS , &reslimit); 365 } 366 367 /* 368 * signal handling to reset stored directory times and modes. Since 369 * we deal with broken pipes via failed writes we ignore it. We also 370 * deal with any file size limit through failed writes. Cpu time 371 * limits are caught and a cleanup is forced. 372 */ 373 if ((sigemptyset(&s_mask) < 0) || (sigaddset(&s_mask, SIGTERM) < 0) || 374 (sigaddset(&s_mask,SIGINT) < 0)||(sigaddset(&s_mask,SIGHUP) < 0) || 375 (sigaddset(&s_mask,SIGPIPE) < 0)||(sigaddset(&s_mask,SIGQUIT)<0) || 376 (sigaddset(&s_mask,SIGXCPU) < 0)||(sigaddset(&s_mask,SIGXFSZ)<0)) { 377 paxwarn(1, "Unable to set up signal mask"); 378 return(-1); 379 } 380 memset(&n_hand, 0, sizeof n_hand); 381 n_hand.sa_mask = s_mask; 382 n_hand.sa_flags = 0; 383 n_hand.sa_handler = sig_cleanup; 384 385 if ((sigaction(SIGHUP, &n_hand, &o_hand) < 0) && 386 (o_hand.sa_handler == SIG_IGN) && 387 (sigaction(SIGHUP, &o_hand, &o_hand) < 0)) 388 goto out; 389 390 if ((sigaction(SIGTERM, &n_hand, &o_hand) < 0) && 391 (o_hand.sa_handler == SIG_IGN) && 392 (sigaction(SIGTERM, &o_hand, &o_hand) < 0)) 393 goto out; 394 395 if ((sigaction(SIGINT, &n_hand, &o_hand) < 0) && 396 (o_hand.sa_handler == SIG_IGN) && 397 (sigaction(SIGINT, &o_hand, &o_hand) < 0)) 398 goto out; 399 400 if ((sigaction(SIGQUIT, &n_hand, &o_hand) < 0) && 401 (o_hand.sa_handler == SIG_IGN) && 402 (sigaction(SIGQUIT, &o_hand, &o_hand) < 0)) 403 goto out; 404 405 if ((sigaction(SIGXCPU, &n_hand, &o_hand) < 0) && 406 (o_hand.sa_handler == SIG_IGN) && 407 (sigaction(SIGXCPU, &o_hand, &o_hand) < 0)) 408 goto out; 409 410 n_hand.sa_handler = SIG_IGN; 411 if ((sigaction(SIGPIPE, &n_hand, &o_hand) < 0) || 412 (sigaction(SIGXFSZ, &n_hand, &o_hand) < 0)) 413 goto out; 414 return(0); 415 416 out: 417 syswarn(1, errno, "Unable to set up signal handler"); 418 return(-1); 419 } 420