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. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#) Copyright (c) 1992, 1993 The Regents of the University of California. All rights reserved. 34 * @(#)pax.c 8.2 (Berkeley) 4/18/94 35 * $FreeBSD: src/bin/pax/pax.c,v 1.13.2.4 2002/11/07 15:29:53 imp Exp $ 36 * $DragonFly: src/bin/pax/pax.c,v 1.6 2006/09/27 21:58:08 pavalos Exp $ 37 */ 38 39 #include <sys/types.h> 40 #include <sys/stat.h> 41 #include <sys/time.h> 42 #include <sys/resource.h> 43 #include <err.h> 44 #include <errno.h> 45 #include <fcntl.h> 46 #include <locale.h> 47 #include <paths.h> 48 #include <signal.h> 49 #include <stdio.h> 50 #include <stdlib.h> 51 #include <string.h> 52 #include <unistd.h> 53 #include "pax.h" 54 #include "extern.h" 55 static int gen_init (void); 56 57 /* 58 * PAX main routines, general globals and some simple start up routines 59 */ 60 61 /* 62 * Variables that can be accessed by any routine within pax 63 */ 64 int act = DEFOP; /* read/write/append/copy */ 65 FSUB *frmt = NULL; /* archive format type */ 66 int cflag; /* match all EXCEPT pattern/file */ 67 int cwdfd; /* starting cwd */ 68 int dflag; /* directory member match only */ 69 int iflag; /* interactive file/archive rename */ 70 int kflag; /* do not overwrite existing files */ 71 int lflag; /* use hard links when possible */ 72 int nflag; /* select first archive member match */ 73 int tflag; /* restore access time after read */ 74 int uflag; /* ignore older modification time files */ 75 int vflag; /* produce verbose output */ 76 int Dflag; /* same as uflag except inode change time */ 77 int Hflag; /* follow command line symlinks (write only) */ 78 int Lflag; /* follow symlinks when writing */ 79 int Xflag; /* archive files with same device id only */ 80 int Yflag; /* same as Dflag except after name mode */ 81 int Zflag; /* same as uflag except after name mode */ 82 int vfpart; /* is partial verbose output in progress */ 83 int patime = 1; /* preserve file access time */ 84 int pmtime = 1; /* preserve file modification times */ 85 int nodirs; /* do not create directories as needed */ 86 int pmode; /* preserve file mode bits */ 87 int pids; /* preserve file uid/gid */ 88 int rmleadslash = 0; /* remove leading '/' from pathnames */ 89 int exit_val; /* exit value */ 90 int docrc; /* check/create file crc */ 91 char *dirptr; /* destination dir in a copy */ 92 char *argv0; /* root of argv[0] */ 93 sigset_t s_mask; /* signal mask for cleanup critical sect */ 94 FILE *listf; /* file pointer to print file list to */ 95 char *tempfile; /* tempfile to use for mkstemp(3) */ 96 char *tempbase; /* basename of tempfile to use for mkstemp(3) */ 97 98 /* 99 * PAX - Portable Archive Interchange 100 * 101 * A utility to read, write, and write lists of the members of archive 102 * files and copy directory hierarchies. A variety of archive formats 103 * are supported (some are described in POSIX 1003.1 10.1): 104 * 105 * ustar - 10.1.1 extended tar interchange format 106 * cpio - 10.1.2 extended cpio interchange format 107 * tar - old BSD 4.3 tar format 108 * binary cpio - old cpio with binary header format 109 * sysVR4 cpio - with and without CRC 110 * 111 * This version is a superset of IEEE Std 1003.2b-d3 112 * 113 * Summary of Extensions to the IEEE Standard: 114 * 115 * 1 READ ENHANCEMENTS 116 * 1.1 Operations which read archives will continue to operate even when 117 * processing archives which may be damaged, truncated, or fail to meet 118 * format specs in several different ways. Damaged sections of archives 119 * are detected and avoided if possible. Attempts will be made to resync 120 * archive read operations even with badly damaged media. 121 * 1.2 Blocksize requirements are not strictly enforced on archive read. 122 * Tapes which have variable sized records can be read without errors. 123 * 1.3 The user can specify via the non-standard option flag -E if error 124 * resync operation should stop on a media error, try a specified number 125 * of times to correct, or try to correct forever. 126 * 1.4 Sparse files (lseek holes) stored on the archive (but stored with blocks 127 * of all zeros will be restored with holes appropriate for the target 128 * filesystem 129 * 1.5 The user is notified whenever something is found during archive 130 * read operations which violates spec (but the read will continue). 131 * 1.6 Multiple archive volumes can be read and may span over different 132 * archive devices 133 * 1.7 Rigidly restores all file attributes exactly as they are stored on the 134 * archive. 135 * 1.8 Modification change time ranges can be specified via multiple -T 136 * options. These allow a user to select files whose modification time 137 * lies within a specific time range. 138 * 1.9 Files can be selected based on owner (user name or uid) via one or more 139 * -U options. 140 * 1.10 Files can be selected based on group (group name or gid) via one o 141 * more -G options. 142 * 1.11 File modification time can be checked against existing file after 143 * name modification (-Z) 144 * 145 * 2 WRITE ENHANCEMENTS 146 * 2.1 Write operation will stop instead of allowing a user to create a flawed 147 * flawed archive (due to any problem). 148 * 2.2 Archives written by pax are forced to strictly conform to both the 149 * archive and pax the specific format specifications. 150 * 2.3 Blocking size and format is rigidly enforced on writes. 151 * 2.4 Formats which may exhibit header overflow problems (they have fields 152 * too small for large file systems, such as inode number storage), use 153 * routines designed to repair this problem. These techniques still 154 * conform to both pax and format specifications, but no longer truncate 155 * these fields. This removes any restrictions on using these archive 156 * formats on large file systems. 157 * 2.5 Multiple archive volumes can be written and may span over different 158 * archive devices 159 * 2.6 A archive volume record limit allows the user to specify the number 160 * of bytes stored on an archive volume. When reached the user is 161 * prompted for the next archive volume. This is specified with the 162 * non-standard -B flag. The limit is rounded up to the next blocksize. 163 * 2.7 All archive padding during write use zero filled sections. This makes 164 * it much easier to pull data out of flawed archive during read 165 * operations. 166 * 2.8 Access time reset with the -t applies to all file nodes (including 167 * directories). 168 * 2.9 Symbolic links can be followed with -L (optional in the spec). 169 * 2.10 Modification or inode change time ranges can be specified via 170 * multiple -T options. These allow a user to select files whose 171 * modification or inode change time lies within a specific time range. 172 * 2.11 Files can be selected based on owner (user name or uid) via one or more 173 * -U options. 174 * 2.12 Files can be selected based on group (group name or gid) via one o 175 * more -G options. 176 * 2.13 Symlinks which appear on the command line can be followed (without 177 * following other symlinks; -H flag) 178 * 179 * 3 COPY ENHANCEMENTS 180 * 3.1 Sparse files (lseek holes) can be copied without expanding the holes 181 * into zero filled blocks. The file copy is created with holes which are 182 * appropriate for the target filesystem 183 * 3.2 Access time as well as modification time on copied file trees can be 184 * preserved with the appropriate -p options. 185 * 3.3 Access time reset with the -t applies to all file nodes (including 186 * directories). 187 * 3.4 Symbolic links can be followed with -L (optional in the spec). 188 * 3.5 Modification or inode change time ranges can be specified via 189 * multiple -T options. These allow a user to select files whose 190 * modification or inode change time lies within a specific time range. 191 * 3.6 Files can be selected based on owner (user name or uid) via one or more 192 * -U options. 193 * 3.7 Files can be selected based on group (group name or gid) via one o 194 * more -G options. 195 * 3.8 Symlinks which appear on the command line can be followed (without 196 * following other symlinks; -H flag) 197 * 3.9 File inode change time can be checked against existing file before 198 * name modification (-D) 199 * 3.10 File inode change time can be checked against existing file after 200 * name modification (-Y) 201 * 3.11 File modification time can be checked against existing file after 202 * name modification (-Z) 203 * 204 * 4 GENERAL ENHANCEMENTS 205 * 4.1 Internal structure is designed to isolate format dependent and 206 * independent functions. Formats are selected via a format driver table. 207 * This encourages the addition of new archive formats by only having to 208 * write those routines which id, read and write the archive header. 209 */ 210 211 /* 212 * main() 213 * parse options, set up and operate as specified by the user. 214 * any operational flaw will set exit_val to non-zero 215 * Return: 0 if ok, 1 otherwise 216 */ 217 218 int 219 main(int argc, char **argv) 220 { 221 char *tmpdir; 222 size_t tdlen; 223 224 setlocale(LC_ALL, ""); 225 listf = stderr; 226 /* 227 * Keep a reference to cwd, so we can always come back home. 228 */ 229 cwdfd = open(".", O_RDONLY); 230 if (cwdfd < 0) { 231 syswarn(0, errno, "Can't open current working directory."); 232 return(exit_val); 233 } 234 235 /* 236 * Where should we put temporary files? 237 */ 238 if ((tmpdir = getenv("TMPDIR")) == NULL || *tmpdir == '\0') 239 tmpdir = _PATH_TMP; 240 tdlen = strlen(tmpdir); 241 while(tdlen > 0 && tmpdir[tdlen - 1] == '/') 242 tdlen--; 243 tempfile = malloc(tdlen + 1 + sizeof(_TFILE_BASE)); 244 if (tempfile == NULL) { 245 paxwarn(1, "Cannot allocate memory for temp file name."); 246 return(exit_val); 247 } 248 if (tdlen) 249 memcpy(tempfile, tmpdir, tdlen); 250 tempbase = tempfile + tdlen; 251 *tempbase++ = '/'; 252 253 /* 254 * parse options, determine operational mode, general init 255 */ 256 options(argc, argv); 257 if ((gen_init() < 0) || (tty_init() < 0)) 258 return(exit_val); 259 260 /* 261 * select a primary operation mode 262 */ 263 switch(act) { 264 case EXTRACT: 265 extract(); 266 break; 267 case ARCHIVE: 268 archive(); 269 break; 270 case APPND: 271 if (gzip_program != NULL) 272 err(1, "can not gzip while appending"); 273 append(); 274 break; 275 case COPY: 276 copy(); 277 break; 278 default: 279 case LIST: 280 list(); 281 break; 282 } 283 return(exit_val); 284 } 285 286 /* 287 * sig_cleanup() 288 * when interrupted we try to do whatever delayed processing we can. 289 * This is not critical, but we really ought to limit our damage when we 290 * are aborted by the user. 291 * Return: 292 * never.... 293 */ 294 295 void 296 sig_cleanup(int which_sig) 297 { 298 /* 299 * restore modes and times for any dirs we may have created 300 * or any dirs we may have read. Set vflag and vfpart so the user 301 * will clearly see the message on a line by itself. 302 */ 303 vflag = vfpart = 1; 304 if (which_sig == SIGXCPU) 305 paxwarn(0, "Cpu time limit reached, cleaning up."); 306 else 307 paxwarn(0, "Signal caught, cleaning up."); 308 309 ar_close(); 310 proc_dir(); 311 if (tflag) 312 atdir_end(); 313 exit(1); 314 } 315 316 /* 317 * gen_init() 318 * general setup routines. Not all are required, but they really help 319 * when dealing with a medium to large sized archives. 320 */ 321 322 static int 323 gen_init(void) 324 { 325 struct rlimit reslimit; 326 struct sigaction n_hand; 327 struct sigaction o_hand; 328 329 /* 330 * Really needed to handle large archives. We can run out of memory for 331 * internal tables really fast when we have a whole lot of files... 332 */ 333 if (getrlimit(RLIMIT_DATA , &reslimit) == 0){ 334 reslimit.rlim_cur = reslimit.rlim_max; 335 setrlimit(RLIMIT_DATA , &reslimit); 336 } 337 338 /* 339 * should file size limits be waived? if the os limits us, this is 340 * needed if we want to write a large archive 341 */ 342 if (getrlimit(RLIMIT_FSIZE , &reslimit) == 0){ 343 reslimit.rlim_cur = reslimit.rlim_max; 344 setrlimit(RLIMIT_FSIZE , &reslimit); 345 } 346 347 /* 348 * increase the size the stack can grow to 349 */ 350 if (getrlimit(RLIMIT_STACK , &reslimit) == 0){ 351 reslimit.rlim_cur = reslimit.rlim_max; 352 setrlimit(RLIMIT_STACK , &reslimit); 353 } 354 355 /* 356 * not really needed, but doesn't hurt 357 */ 358 if (getrlimit(RLIMIT_RSS , &reslimit) == 0){ 359 reslimit.rlim_cur = reslimit.rlim_max; 360 setrlimit(RLIMIT_RSS , &reslimit); 361 } 362 363 /* 364 * signal handling to reset stored directory times and modes. Since 365 * we deal with broken pipes via failed writes we ignore it. We also 366 * deal with any file size limit through failed writes. Cpu time 367 * limits are caught and a cleanup is forced. 368 */ 369 if ((sigemptyset(&s_mask) < 0) || (sigaddset(&s_mask, SIGTERM) < 0) || 370 (sigaddset(&s_mask,SIGINT) < 0)||(sigaddset(&s_mask,SIGHUP) < 0) || 371 (sigaddset(&s_mask,SIGPIPE) < 0)||(sigaddset(&s_mask,SIGQUIT)<0) || 372 (sigaddset(&s_mask,SIGXCPU) < 0)||(sigaddset(&s_mask,SIGXFSZ)<0)) { 373 paxwarn(1, "Unable to set up signal mask"); 374 return(-1); 375 } 376 memset(&n_hand, 0, sizeof n_hand); 377 n_hand.sa_mask = s_mask; 378 n_hand.sa_flags = 0; 379 n_hand.sa_handler = sig_cleanup; 380 381 if ((sigaction(SIGHUP, &n_hand, &o_hand) < 0) && 382 (o_hand.sa_handler == SIG_IGN) && 383 (sigaction(SIGHUP, &o_hand, &o_hand) < 0)) 384 goto out; 385 386 if ((sigaction(SIGTERM, &n_hand, &o_hand) < 0) && 387 (o_hand.sa_handler == SIG_IGN) && 388 (sigaction(SIGTERM, &o_hand, &o_hand) < 0)) 389 goto out; 390 391 if ((sigaction(SIGINT, &n_hand, &o_hand) < 0) && 392 (o_hand.sa_handler == SIG_IGN) && 393 (sigaction(SIGINT, &o_hand, &o_hand) < 0)) 394 goto out; 395 396 if ((sigaction(SIGQUIT, &n_hand, &o_hand) < 0) && 397 (o_hand.sa_handler == SIG_IGN) && 398 (sigaction(SIGQUIT, &o_hand, &o_hand) < 0)) 399 goto out; 400 401 if ((sigaction(SIGXCPU, &n_hand, &o_hand) < 0) && 402 (o_hand.sa_handler == SIG_IGN) && 403 (sigaction(SIGXCPU, &o_hand, &o_hand) < 0)) 404 goto out; 405 406 n_hand.sa_handler = SIG_IGN; 407 if ((sigaction(SIGPIPE, &n_hand, &o_hand) < 0) || 408 (sigaction(SIGXFSZ, &n_hand, &o_hand) < 0)) 409 goto out; 410 return(0); 411 412 out: 413 syswarn(1, errno, "Unable to set up signal handler"); 414 return(-1); 415 } 416