| File: | src/bin/pax/ar_io.c |
| Warning: | line 646, column 4 Value stored to 'res' is never read |
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| 1 | /* $OpenBSD: ar_io.c,v 1.63 2019/06/28 13:34:59 deraadt Exp $ */ |
| 2 | /* $NetBSD: ar_io.c,v 1.5 1996/03/26 23:54:13 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 | #include <sys/types.h> |
| 38 | #include <sys/stat.h> |
| 39 | #include <sys/ioctl.h> |
| 40 | #include <sys/mtio.h> |
| 41 | #include <sys/wait.h> |
| 42 | #include <err.h> |
| 43 | #include <errno(*__errno()).h> |
| 44 | #include <fcntl.h> |
| 45 | #include <signal.h> |
| 46 | #include <stdio.h> |
| 47 | #include <stdlib.h> |
| 48 | #include <string.h> |
| 49 | #include <unistd.h> |
| 50 | |
| 51 | #include "pax.h" |
| 52 | #include "extern.h" |
| 53 | |
| 54 | /* |
| 55 | * Routines which deal directly with the archive I/O device/file. |
| 56 | */ |
| 57 | |
| 58 | #define DMOD0666 0666 /* default mode of created archives */ |
| 59 | #define EXT_MODE0x0000 O_RDONLY0x0000 /* open mode for list/extract */ |
| 60 | #define AR_MODE(0x0001 | 0x0200 | 0x0400) (O_WRONLY0x0001 | O_CREAT0x0200 | O_TRUNC0x0400) /* mode for archive */ |
| 61 | #define APP_MODE0x0002 O_RDWR0x0002 /* mode for append */ |
| 62 | #define STDO"<STDOUT>" "<STDOUT>" /* pseudo name for stdout */ |
| 63 | #define STDN"<STDIN>" "<STDIN>" /* pseudo name for stdin */ |
| 64 | static int arfd = -1; /* archive file descriptor */ |
| 65 | static int artyp = ISREG0; /* archive type: file/FIFO/tape */ |
| 66 | static int arvol = 1; /* archive volume number */ |
| 67 | static int lstrval = -1; /* return value from last i/o */ |
| 68 | static int io_ok; /* i/o worked on volume after resync */ |
| 69 | static int did_io; /* did i/o ever occur on volume? */ |
| 70 | static int done; /* set via tty termination */ |
| 71 | static struct stat arsb; /* stat of archive device at open */ |
| 72 | static int invld_rec; /* tape has out of spec record size */ |
| 73 | static int wr_trail = 1; /* trailer was rewritten in append */ |
| 74 | static int can_unlnk = 0; /* do we unlink null archives? */ |
| 75 | const char *arcname; /* printable name of archive */ |
| 76 | const char *gzip_program; /* name of gzip program */ |
| 77 | static pid_t zpid = -1; /* pid of child process */ |
| 78 | int force_one_volume; /* 1 if we ignore volume changes */ |
| 79 | |
| 80 | static int get_phys(void); |
| 81 | extern sigset_t s_mask; |
| 82 | static void ar_start_gzip(int, const char *, int); |
| 83 | |
| 84 | /* |
| 85 | * ar_open() |
| 86 | * Opens the next archive volume. Determines the type of the device and |
| 87 | * sets up block sizes as required by the archive device and the format. |
| 88 | * Note: we may be called with name == NULL on the first open only. |
| 89 | * Return: |
| 90 | * -1 on failure, 0 otherwise |
| 91 | */ |
| 92 | |
| 93 | int |
| 94 | ar_open(const char *name) |
| 95 | { |
| 96 | struct mtget mb; |
| 97 | |
| 98 | if (arfd != -1) |
| 99 | (void)close(arfd); |
| 100 | arfd = -1; |
| 101 | can_unlnk = did_io = io_ok = invld_rec = 0; |
| 102 | artyp = ISREG0; |
| 103 | flcnt = 0; |
| 104 | |
| 105 | /* |
| 106 | * open based on overall operation mode |
| 107 | */ |
| 108 | switch (act) { |
| 109 | case LIST0: |
| 110 | case EXTRACT1: |
| 111 | if (name == NULL((void *)0)) { |
| 112 | arfd = STDIN_FILENO0; |
| 113 | arcname = STDN"<STDIN>"; |
| 114 | } else if ((arfd = open(name, EXT_MODE0x0000, DMOD0666)) == -1) |
| 115 | syswarn(1, errno(*__errno()), "Failed open to read on %s", name); |
| 116 | if (arfd != -1 && gzip_program != NULL((void *)0)) |
| 117 | ar_start_gzip(arfd, gzip_program, 0); |
| 118 | break; |
| 119 | case ARCHIVE2: |
| 120 | if (name == NULL((void *)0)) { |
| 121 | arfd = STDOUT_FILENO1; |
| 122 | arcname = STDO"<STDOUT>"; |
| 123 | } else if ((arfd = open(name, AR_MODE(0x0001 | 0x0200 | 0x0400), DMOD0666)) == -1) |
| 124 | syswarn(1, errno(*__errno()), "Failed open to write on %s", name); |
| 125 | else |
| 126 | can_unlnk = 1; |
| 127 | if (arfd != -1 && gzip_program != NULL((void *)0)) |
| 128 | ar_start_gzip(arfd, gzip_program, 1); |
| 129 | break; |
| 130 | case APPND3: |
| 131 | if (name == NULL((void *)0)) { |
| 132 | arfd = STDOUT_FILENO1; |
| 133 | arcname = STDO"<STDOUT>"; |
| 134 | } else if ((arfd = open(name, APP_MODE0x0002, DMOD0666)) == -1) |
| 135 | syswarn(1, errno(*__errno()), "Failed open to read/write on %s", |
| 136 | name); |
| 137 | break; |
| 138 | case COPY4: |
| 139 | /* |
| 140 | * arfd not used in COPY mode |
| 141 | */ |
| 142 | arcname = "<NONE>"; |
| 143 | lstrval = 1; |
| 144 | return(0); |
| 145 | } |
| 146 | if (arfd < 0) |
| 147 | return(-1); |
| 148 | |
| 149 | if (chdname != NULL((void *)0)) |
| 150 | if (chdir(chdname) == -1) { |
| 151 | syswarn(1, errno(*__errno()), "Failed chdir to %s", chdname); |
| 152 | return(-1); |
| 153 | } |
| 154 | /* |
| 155 | * set up is based on device type |
| 156 | */ |
| 157 | if (fstat(arfd, &arsb) == -1) { |
| 158 | syswarn(1, errno(*__errno()), "Failed stat on %s", arcname); |
| 159 | (void)close(arfd); |
| 160 | arfd = -1; |
| 161 | can_unlnk = 0; |
| 162 | return(-1); |
| 163 | } |
| 164 | if (S_ISDIR(arsb.st_mode)((arsb.st_mode & 0170000) == 0040000)) { |
| 165 | paxwarn(0, "Cannot write an archive on top of a directory %s", |
| 166 | arcname); |
| 167 | (void)close(arfd); |
| 168 | arfd = -1; |
| 169 | can_unlnk = 0; |
| 170 | return(-1); |
| 171 | } |
| 172 | |
| 173 | if (S_ISCHR(arsb.st_mode)((arsb.st_mode & 0170000) == 0020000)) |
| 174 | artyp = ioctl(arfd, MTIOCGET((unsigned long)0x40000000 | ((sizeof(struct mtget) & 0x1fff ) << 16) | ((('m')) << 8) | ((2))), &mb) ? ISCHR1 : ISTAPE3; |
| 175 | else if (S_ISBLK(arsb.st_mode)((arsb.st_mode & 0170000) == 0060000)) |
| 176 | artyp = ISBLK2; |
| 177 | else if ((lseek(arfd, 0, SEEK_CUR1) == -1) && (errno(*__errno()) == ESPIPE29)) |
| 178 | artyp = ISPIPE4; |
| 179 | else |
| 180 | artyp = ISREG0; |
| 181 | |
| 182 | /* |
| 183 | * make sure beyond any doubt that we can unlink only regular files |
| 184 | * we created |
| 185 | */ |
| 186 | if (artyp != ISREG0) |
| 187 | can_unlnk = 0; |
| 188 | /* |
| 189 | * if we are writing, we are done |
| 190 | */ |
| 191 | if (act == ARCHIVE2) { |
| 192 | blksz = rdblksz = wrblksz; |
| 193 | lstrval = 1; |
| 194 | return(0); |
| 195 | } |
| 196 | |
| 197 | /* |
| 198 | * set default blksz on read. APPNDs writes rdblksz on the last volume |
| 199 | * On all new archive volumes, we shift to wrblksz (if the user |
| 200 | * specified one, otherwise we will continue to use rdblksz). We |
| 201 | * must set blocksize based on what kind of device the archive is |
| 202 | * stored. |
| 203 | */ |
| 204 | switch (artyp) { |
| 205 | case ISTAPE3: |
| 206 | /* |
| 207 | * Tape drives come in at least two flavors. Those that support |
| 208 | * variable sized records and those that have fixed sized |
| 209 | * records. They must be treated differently. For tape drives |
| 210 | * that support variable sized records, we must make large |
| 211 | * reads to make sure we get the entire record, otherwise we |
| 212 | * will just get the first part of the record (up to size we |
| 213 | * asked). Tapes with fixed sized records may or may not return |
| 214 | * multiple records in a single read. We really do not care |
| 215 | * what the physical record size is UNLESS we are going to |
| 216 | * append. (We will need the physical block size to rewrite |
| 217 | * the trailer). Only when we are appending do we go to the |
| 218 | * effort to figure out the true PHYSICAL record size. |
| 219 | */ |
| 220 | blksz = rdblksz = MAXBLK64512; |
| 221 | break; |
| 222 | case ISPIPE4: |
| 223 | case ISBLK2: |
| 224 | case ISCHR1: |
| 225 | /* |
| 226 | * Blocksize is not a major issue with these devices (but must |
| 227 | * be kept a multiple of 512). If the user specified a write |
| 228 | * block size, we use that to read. Under append, we must |
| 229 | * always keep blksz == rdblksz. Otherwise we go ahead and use |
| 230 | * the device optimal blocksize as (and if) returned by stat |
| 231 | * and if it is within pax specs. |
| 232 | */ |
| 233 | if ((act == APPND3) && wrblksz) { |
| 234 | blksz = rdblksz = wrblksz; |
| 235 | break; |
| 236 | } |
| 237 | |
| 238 | if ((arsb.st_blksize > 0) && (arsb.st_blksize < MAXBLK64512) && |
| 239 | ((arsb.st_blksize % BLKMULT512) == 0)) |
| 240 | rdblksz = arsb.st_blksize; |
| 241 | else |
| 242 | rdblksz = DEVBLK8192; |
| 243 | /* |
| 244 | * For performance go for large reads when we can without harm |
| 245 | */ |
| 246 | if ((act == APPND3) || (artyp == ISCHR1)) |
| 247 | blksz = rdblksz; |
| 248 | else |
| 249 | blksz = MAXBLK64512; |
| 250 | break; |
| 251 | case ISREG0: |
| 252 | /* |
| 253 | * if the user specified wrblksz works, use it. Under appends |
| 254 | * we must always keep blksz == rdblksz |
| 255 | */ |
| 256 | if ((act == APPND3) && wrblksz && ((arsb.st_size%wrblksz)==0)){ |
| 257 | blksz = rdblksz = wrblksz; |
| 258 | break; |
| 259 | } |
| 260 | /* |
| 261 | * See if we can find the blocking factor from the file size |
| 262 | */ |
| 263 | for (rdblksz = MAXBLK64512; rdblksz > 0; rdblksz -= BLKMULT512) |
| 264 | if ((arsb.st_size % rdblksz) == 0) |
| 265 | break; |
| 266 | /* |
| 267 | * When we cannot find a match, we may have a flawed archive. |
| 268 | */ |
| 269 | if (rdblksz <= 0) |
| 270 | rdblksz = FILEBLK10240; |
| 271 | /* |
| 272 | * for performance go for large reads when we can |
| 273 | */ |
| 274 | if (act == APPND3) |
| 275 | blksz = rdblksz; |
| 276 | else |
| 277 | blksz = MAXBLK64512; |
| 278 | break; |
| 279 | default: |
| 280 | /* |
| 281 | * should never happen, worst case, slow... |
| 282 | */ |
| 283 | blksz = rdblksz = BLKMULT512; |
| 284 | break; |
| 285 | } |
| 286 | lstrval = 1; |
| 287 | return(0); |
| 288 | } |
| 289 | |
| 290 | /* |
| 291 | * ar_close(int int_sig) |
| 292 | * closes archive device, increments volume number, and prints i/o summary |
| 293 | * If in_sig is set we're in a signal handler and can't flush stdio. |
| 294 | */ |
| 295 | void |
| 296 | ar_close(int in_sig) |
| 297 | { |
| 298 | int status; |
| 299 | |
| 300 | if (arfd < 0) { |
| 301 | did_io = io_ok = flcnt = 0; |
| 302 | return; |
| 303 | } |
| 304 | if (!in_sig) |
| 305 | fflush(listf); |
| 306 | |
| 307 | /* |
| 308 | * Close archive file. This may take a LONG while on tapes (we may be |
| 309 | * forced to wait for the rewind to complete) so tell the user what is |
| 310 | * going on (this avoids the user hitting control-c thinking pax is |
| 311 | * broken). |
| 312 | */ |
| 313 | if (vflag && (artyp == ISTAPE3)) { |
| 314 | (void)dprintf(listfd, |
| 315 | "%s%s: Waiting for tape drive close to complete...", |
| 316 | vfpart ? "\n" : "", argv0); |
| 317 | } |
| 318 | |
| 319 | /* |
| 320 | * if nothing was written to the archive (and we created it), we remove |
| 321 | * it |
| 322 | */ |
| 323 | if (can_unlnk && (fstat(arfd, &arsb) == 0) && (S_ISREG(arsb.st_mode)((arsb.st_mode & 0170000) == 0100000)) && |
| 324 | (arsb.st_size == 0)) { |
| 325 | (void)unlink(arcname); |
| 326 | can_unlnk = 0; |
| 327 | } |
| 328 | |
| 329 | /* |
| 330 | * for a quick extract/list, pax frequently exits before the child |
| 331 | * process is done |
| 332 | */ |
| 333 | if ((act == LIST0 || act == EXTRACT1) && nflag && zpid > 0) { |
| 334 | kill(zpid, SIGINT2); |
| 335 | zpid = -1; |
| 336 | } |
| 337 | |
| 338 | (void)close(arfd); |
| 339 | |
| 340 | /* Do not exit before child to ensure data integrity */ |
| 341 | if (zpid > 0) { |
| 342 | waitpid(zpid, &status, 0); |
| 343 | if (!WIFEXITED(status)(((status) & 0177) == 0) || WEXITSTATUS(status)(int)(((unsigned)(status) >> 8) & 0xff)) |
| 344 | exit_val = 1; |
| 345 | } |
| 346 | |
| 347 | |
| 348 | if (vflag && (artyp == ISTAPE3)) { |
| 349 | (void)write(listfd, "done.\n", sizeof("done.\n")-1); |
| 350 | vfpart = 0; |
| 351 | } |
| 352 | arfd = -1; |
| 353 | |
| 354 | if (!io_ok && !did_io) { |
| 355 | flcnt = 0; |
| 356 | return; |
| 357 | } |
| 358 | did_io = io_ok = 0; |
| 359 | |
| 360 | /* |
| 361 | * The volume number is only increased when the last device has data |
| 362 | * and we have already determined the archive format. |
| 363 | */ |
| 364 | if (frmt != NULL((void *)0)) |
| 365 | ++arvol; |
| 366 | |
| 367 | if (!vflag) { |
| 368 | flcnt = 0; |
| 369 | return; |
| 370 | } |
| 371 | |
| 372 | /* |
| 373 | * Print out a summary of I/O for this archive volume. |
| 374 | */ |
| 375 | if (vfpart) { |
| 376 | (void)write(listfd, "\n", 1); |
| 377 | vfpart = 0; |
| 378 | } |
| 379 | |
| 380 | /* |
| 381 | * If we have not determined the format yet, we just say how many bytes |
| 382 | * we have skipped over looking for a header to id. there is no way we |
| 383 | * could have written anything yet. |
| 384 | */ |
| 385 | if (frmt == NULL((void *)0)) { |
| 386 | (void)dprintf(listfd, |
| 387 | "%s: unknown format, %llu bytes skipped.\n", argv0, rdcnt); |
| 388 | flcnt = 0; |
| 389 | return; |
| 390 | } |
| 391 | |
| 392 | if (op_mode == OP_PAX) |
| 393 | (void)dprintf(listfd, "%s: %s vol %d, %lu files," |
| 394 | " %llu bytes read, %llu bytes written.\n", |
| 395 | argv0, frmt->name, arvol-1, flcnt, rdcnt, wrcnt); |
| 396 | #ifndef NOCPIO |
| 397 | else if (op_mode == OP_CPIO) |
| 398 | (void)dprintf(listfd, "%llu blocks\n", |
| 399 | (rdcnt ? rdcnt : wrcnt) / 5120); |
| 400 | #endif /* !NOCPIO */ |
| 401 | flcnt = 0; |
| 402 | } |
| 403 | |
| 404 | /* |
| 405 | * ar_drain() |
| 406 | * drain any archive format independent padding from an archive read |
| 407 | * from a socket or a pipe. This is to prevent the process on the |
| 408 | * other side of the pipe from getting a SIGPIPE (pax will stop |
| 409 | * reading an archive once a format dependent trailer is detected). |
| 410 | */ |
| 411 | void |
| 412 | ar_drain(void) |
| 413 | { |
| 414 | int res; |
| 415 | char drbuf[MAXBLK64512]; |
| 416 | |
| 417 | /* |
| 418 | * we only drain from a pipe/socket. Other devices can be closed |
| 419 | * without reading up to end of file. We sure hope that pipe is closed |
| 420 | * on the other side so we will get an EOF. |
| 421 | */ |
| 422 | if ((artyp != ISPIPE4) || (lstrval <= 0)) |
| 423 | return; |
| 424 | |
| 425 | /* |
| 426 | * keep reading until pipe is drained |
| 427 | */ |
| 428 | while ((res = read(arfd, drbuf, sizeof(drbuf))) > 0) |
| 429 | continue; |
| 430 | lstrval = res; |
| 431 | } |
| 432 | |
| 433 | /* |
| 434 | * ar_set_wr() |
| 435 | * Set up device right before switching from read to write in an append. |
| 436 | * device dependent code (if required) to do this should be added here. |
| 437 | * For all archive devices we are already positioned at the place we want |
| 438 | * to start writing when this routine is called. |
| 439 | * Return: |
| 440 | * 0 if all ready to write, -1 otherwise |
| 441 | */ |
| 442 | |
| 443 | int |
| 444 | ar_set_wr(void) |
| 445 | { |
| 446 | off_t cpos; |
| 447 | |
| 448 | /* |
| 449 | * we must make sure the trailer is rewritten on append, ar_next() |
| 450 | * will stop us if the archive containing the trailer was not written |
| 451 | */ |
| 452 | wr_trail = 0; |
| 453 | |
| 454 | /* |
| 455 | * Add any device dependent code as required here |
| 456 | */ |
| 457 | if (artyp != ISREG0) |
| 458 | return(0); |
| 459 | /* |
| 460 | * Ok we have an archive in a regular file. If we were rewriting a |
| 461 | * file, we must get rid of all the stuff after the current offset |
| 462 | * (it was not written by pax). |
| 463 | */ |
| 464 | if (((cpos = lseek(arfd, 0, SEEK_CUR1)) < 0) || |
| 465 | (ftruncate(arfd, cpos) == -1)) { |
| 466 | syswarn(1, errno(*__errno()), "Unable to truncate archive file"); |
| 467 | return(-1); |
| 468 | } |
| 469 | return(0); |
| 470 | } |
| 471 | |
| 472 | /* |
| 473 | * ar_app_ok() |
| 474 | * check if the last volume in the archive allows appends. We cannot check |
| 475 | * this until we are ready to write since there is no spec that says all |
| 476 | * volumes in a single archive have to be of the same type... |
| 477 | * Return: |
| 478 | * 0 if we can append, -1 otherwise. |
| 479 | */ |
| 480 | |
| 481 | int |
| 482 | ar_app_ok(void) |
| 483 | { |
| 484 | if (artyp == ISPIPE4) { |
| 485 | paxwarn(1, "Cannot append to an archive obtained from a pipe."); |
| 486 | return(-1); |
| 487 | } |
| 488 | |
| 489 | if (!invld_rec) |
| 490 | return(0); |
| 491 | paxwarn(1,"Cannot append, device record size %d does not support %s spec", |
| 492 | rdblksz, argv0); |
| 493 | return(-1); |
| 494 | } |
| 495 | |
| 496 | /* |
| 497 | * ar_read() |
| 498 | * read up to a specified number of bytes from the archive into the |
| 499 | * supplied buffer. When dealing with tapes we may not always be able to |
| 500 | * read what we want. |
| 501 | * Return: |
| 502 | * Number of bytes in buffer. 0 for end of file, -1 for a read error. |
| 503 | */ |
| 504 | |
| 505 | int |
| 506 | ar_read(char *buf, int cnt) |
| 507 | { |
| 508 | int res = 0; |
| 509 | |
| 510 | /* |
| 511 | * if last i/o was in error, no more reads until reset or new volume |
| 512 | */ |
| 513 | if (lstrval <= 0) |
| 514 | return(lstrval); |
| 515 | |
| 516 | /* |
| 517 | * how we read must be based on device type |
| 518 | */ |
| 519 | switch (artyp) { |
| 520 | case ISTAPE3: |
| 521 | if ((res = read(arfd, buf, cnt)) > 0) { |
| 522 | /* |
| 523 | * CAUTION: tape systems may not always return the same |
| 524 | * sized records so we leave blksz == MAXBLK. The |
| 525 | * physical record size that a tape drive supports is |
| 526 | * very hard to determine in a uniform and portable |
| 527 | * manner. |
| 528 | */ |
| 529 | io_ok = 1; |
| 530 | if (res != rdblksz) { |
| 531 | /* |
| 532 | * Record size changed. If this happens on |
| 533 | * any record after the first, we probably have |
| 534 | * a tape drive which has a fixed record size |
| 535 | * (we are getting multiple records in a single |
| 536 | * read). Watch out for record blocking that |
| 537 | * violates pax spec (must be a multiple of |
| 538 | * BLKMULT). |
| 539 | */ |
| 540 | rdblksz = res; |
| 541 | if (rdblksz % BLKMULT512) |
| 542 | invld_rec = 1; |
| 543 | } |
| 544 | return(res); |
| 545 | } |
| 546 | break; |
| 547 | case ISREG0: |
| 548 | case ISBLK2: |
| 549 | case ISCHR1: |
| 550 | case ISPIPE4: |
| 551 | default: |
| 552 | /* |
| 553 | * Files are so easy to deal with. These other things cannot |
| 554 | * be trusted at all. So when we are dealing with character |
| 555 | * devices and pipes we just take what they have ready for us |
| 556 | * and return. Trying to do anything else with them runs the |
| 557 | * risk of failure. |
| 558 | */ |
| 559 | if ((res = read(arfd, buf, cnt)) > 0) { |
| 560 | io_ok = 1; |
| 561 | return(res); |
| 562 | } |
| 563 | break; |
| 564 | } |
| 565 | |
| 566 | /* |
| 567 | * We are in trouble at this point, something is broken... |
| 568 | */ |
| 569 | lstrval = res; |
| 570 | if (res < 0) |
| 571 | syswarn(1, errno(*__errno()), "Failed read on archive volume %d", arvol); |
| 572 | else |
| 573 | paxwarn(0, "End of archive volume %d reached", arvol); |
| 574 | return(res); |
| 575 | } |
| 576 | |
| 577 | /* |
| 578 | * ar_write() |
| 579 | * Write a specified number of bytes in supplied buffer to the archive |
| 580 | * device so it appears as a single "block". Deals with errors and tries |
| 581 | * to recover when faced with short writes. |
| 582 | * Return: |
| 583 | * Number of bytes written. 0 indicates end of volume reached and with no |
| 584 | * flaws (as best that can be detected). A -1 indicates an unrecoverable |
| 585 | * error in the archive occurred. |
| 586 | */ |
| 587 | |
| 588 | int |
| 589 | ar_write(char *buf, int bsz) |
| 590 | { |
| 591 | ssize_t res; |
| 592 | off_t cpos; |
| 593 | |
| 594 | /* |
| 595 | * do not allow pax to create a "bad" archive. Once a write fails on |
| 596 | * an archive volume prevent further writes to it. |
| 597 | */ |
| 598 | if (lstrval <= 0) |
| 599 | return(lstrval); |
| 600 | |
| 601 | if ((res = write(arfd, buf, bsz)) == bsz) { |
| 602 | wr_trail = 1; |
| 603 | io_ok = 1; |
| 604 | return(bsz); |
| 605 | } |
| 606 | /* |
| 607 | * write broke, see what we can do with it. We try to send any partial |
| 608 | * writes that may violate pax spec to the next archive volume. |
| 609 | */ |
| 610 | if (res == -1) |
| 611 | lstrval = res; |
| 612 | else |
| 613 | lstrval = 0; |
| 614 | |
| 615 | switch (artyp) { |
| 616 | case ISREG0: |
| 617 | if ((res > 0) && (res % BLKMULT512)) { |
| 618 | /* |
| 619 | * try to fix up partial writes which are not BLKMULT |
| 620 | * in size by forcing the runt record to next archive |
| 621 | * volume |
| 622 | */ |
| 623 | if ((cpos = lseek(arfd, 0, SEEK_CUR1)) == -1) |
| 624 | break; |
| 625 | cpos -= res; |
| 626 | if (ftruncate(arfd, cpos) == -1) |
| 627 | break; |
| 628 | res = lstrval = 0; |
| 629 | break; |
| 630 | } |
| 631 | if (res >= 0) |
| 632 | break; |
| 633 | /* |
| 634 | * if file is out of space, handle it like a return of 0 |
| 635 | */ |
| 636 | if ((errno(*__errno()) == ENOSPC28) || (errno(*__errno()) == EFBIG27) || (errno(*__errno()) == EDQUOT69)) |
| 637 | res = lstrval = 0; |
| 638 | break; |
| 639 | case ISTAPE3: |
| 640 | case ISCHR1: |
| 641 | case ISBLK2: |
| 642 | if (res >= 0) |
| 643 | break; |
| 644 | if (errno(*__errno()) == EACCES13) { |
| 645 | paxwarn(0, "Write failed, archive is write protected."); |
| 646 | res = lstrval = 0; |
Value stored to 'res' is never read | |
| 647 | return(0); |
| 648 | } |
| 649 | /* |
| 650 | * see if we reached the end of media, if so force a change to |
| 651 | * the next volume |
| 652 | */ |
| 653 | if ((errno(*__errno()) == ENOSPC28) || (errno(*__errno()) == EIO5) || (errno(*__errno()) == ENXIO6)) |
| 654 | res = lstrval = 0; |
| 655 | break; |
| 656 | case ISPIPE4: |
| 657 | default: |
| 658 | /* |
| 659 | * we cannot fix errors to these devices |
| 660 | */ |
| 661 | break; |
| 662 | } |
| 663 | |
| 664 | /* |
| 665 | * Better tell the user the bad news... |
| 666 | * if this is a block aligned archive format, we may have a bad archive |
| 667 | * if the format wants the header to start at a BLKMULT boundary. While |
| 668 | * we can deal with the mis-aligned data, it violates spec and other |
| 669 | * archive readers will likely fail. if the format is not block |
| 670 | * aligned, the user may be lucky (and the archive is ok). |
| 671 | */ |
| 672 | if (res >= 0) { |
| 673 | if (res > 0) |
| 674 | wr_trail = 1; |
| 675 | io_ok = 1; |
| 676 | } |
| 677 | |
| 678 | /* |
| 679 | * If we were trying to rewrite the trailer and it didn't work, we |
| 680 | * must quit right away. |
| 681 | */ |
| 682 | if (!wr_trail && (res <= 0)) { |
| 683 | paxwarn(1,"Unable to append, trailer re-write failed. Quitting."); |
| 684 | return(res); |
| 685 | } |
| 686 | |
| 687 | if (res == 0) |
| 688 | paxwarn(0, "End of archive volume %d reached", arvol); |
| 689 | else if (res < 0) |
| 690 | syswarn(1, errno(*__errno()), "Failed write to archive volume: %d", arvol); |
| 691 | else if (!frmt->blkalgn || ((res % frmt->blkalgn) == 0)) |
| 692 | paxwarn(0,"WARNING: partial archive write. Archive MAY BE FLAWED"); |
| 693 | else |
| 694 | paxwarn(1,"WARNING: partial archive write. Archive IS FLAWED"); |
| 695 | return(res); |
| 696 | } |
| 697 | |
| 698 | /* |
| 699 | * ar_rdsync() |
| 700 | * Try to move past a bad spot on a flawed archive as needed to continue |
| 701 | * I/O. Clears error flags to allow I/O to continue. |
| 702 | * Return: |
| 703 | * 0 when ok to try i/o again, -1 otherwise. |
| 704 | */ |
| 705 | |
| 706 | int |
| 707 | ar_rdsync(void) |
| 708 | { |
| 709 | long fsbz; |
| 710 | off_t cpos; |
| 711 | off_t mpos; |
| 712 | struct mtop mb; |
| 713 | |
| 714 | /* |
| 715 | * Fail resync attempts at user request (done) or if this is going to be |
| 716 | * an update/append to a existing archive. if last i/o hit media end, |
| 717 | * we need to go to the next volume not try a resync |
| 718 | */ |
| 719 | if ((done > 0) || (lstrval == 0)) |
| 720 | return(-1); |
| 721 | |
| 722 | if ((act == APPND3) || (act == ARCHIVE2)) { |
| 723 | paxwarn(1, "Cannot allow updates to an archive with flaws."); |
| 724 | return(-1); |
| 725 | } |
| 726 | if (io_ok) |
| 727 | did_io = 1; |
| 728 | |
| 729 | switch (artyp) { |
| 730 | case ISTAPE3: |
| 731 | /* |
| 732 | * if the last i/o was a successful data transfer, we assume |
| 733 | * the fault is just a bad record on the tape that we are now |
| 734 | * past. If we did not get any data since the last resync try |
| 735 | * to move the tape forward one PHYSICAL record past any |
| 736 | * damaged tape section. Some tape drives are stubborn and need |
| 737 | * to be pushed. |
| 738 | */ |
| 739 | if (io_ok) { |
| 740 | io_ok = 0; |
| 741 | lstrval = 1; |
| 742 | break; |
| 743 | } |
| 744 | mb.mt_op = MTFSR3; |
| 745 | mb.mt_count = 1; |
| 746 | if (ioctl(arfd, MTIOCTOP((unsigned long)0x80000000 | ((sizeof(struct mtop) & 0x1fff ) << 16) | ((('m')) << 8) | ((1))), &mb) == -1) |
| 747 | break; |
| 748 | lstrval = 1; |
| 749 | break; |
| 750 | case ISREG0: |
| 751 | case ISCHR1: |
| 752 | case ISBLK2: |
| 753 | /* |
| 754 | * try to step over the bad part of the device. |
| 755 | */ |
| 756 | io_ok = 0; |
| 757 | if (((fsbz = arsb.st_blksize) <= 0) || (artyp != ISREG0)) |
| 758 | fsbz = BLKMULT512; |
| 759 | if ((cpos = lseek(arfd, 0, SEEK_CUR1)) == -1) |
| 760 | break; |
| 761 | mpos = fsbz - (cpos % fsbz); |
| 762 | if (lseek(arfd, mpos, SEEK_CUR1) == -1) |
| 763 | break; |
| 764 | lstrval = 1; |
| 765 | break; |
| 766 | case ISPIPE4: |
| 767 | default: |
| 768 | /* |
| 769 | * cannot recover on these archive device types |
| 770 | */ |
| 771 | io_ok = 0; |
| 772 | break; |
| 773 | } |
| 774 | if (lstrval <= 0) { |
| 775 | paxwarn(1, "Unable to recover from an archive read failure."); |
| 776 | return(-1); |
| 777 | } |
| 778 | paxwarn(0, "Attempting to recover from an archive read failure."); |
| 779 | return(0); |
| 780 | } |
| 781 | |
| 782 | /* |
| 783 | * ar_fow() |
| 784 | * Move the I/O position within the archive forward the specified number of |
| 785 | * bytes as supported by the device. If we cannot move the requested |
| 786 | * number of bytes, return the actual number of bytes moved in skipped. |
| 787 | * Return: |
| 788 | * 0 if moved the requested distance, -1 on complete failure, 1 on |
| 789 | * partial move (the amount moved is in skipped) |
| 790 | */ |
| 791 | |
| 792 | int |
| 793 | ar_fow(off_t sksz, off_t *skipped) |
| 794 | { |
| 795 | off_t cpos; |
| 796 | off_t mpos; |
| 797 | |
| 798 | *skipped = 0; |
| 799 | if (sksz <= 0) |
| 800 | return(0); |
| 801 | |
| 802 | /* |
| 803 | * we cannot move forward at EOF or error |
| 804 | */ |
| 805 | if (lstrval <= 0) |
| 806 | return(lstrval); |
| 807 | |
| 808 | /* |
| 809 | * Safer to read forward on devices where it is hard to find the end of |
| 810 | * the media without reading to it. With tapes we cannot be sure of the |
| 811 | * number of physical blocks to skip (we do not know physical block |
| 812 | * size at this point), so we must only read forward on tapes! |
| 813 | */ |
| 814 | if (artyp != ISREG0) |
| 815 | return(0); |
| 816 | |
| 817 | /* |
| 818 | * figure out where we are in the archive |
| 819 | */ |
| 820 | if ((cpos = lseek(arfd, 0, SEEK_CUR1)) >= 0) { |
| 821 | /* |
| 822 | * we can be asked to move farther than there are bytes in this |
| 823 | * volume, if so, just go to file end and let normal buf_fill() |
| 824 | * deal with the end of file (it will go to next volume by |
| 825 | * itself) |
| 826 | */ |
| 827 | if ((mpos = cpos + sksz) > arsb.st_size) { |
| 828 | *skipped = arsb.st_size - cpos; |
| 829 | mpos = arsb.st_size; |
| 830 | } else |
| 831 | *skipped = sksz; |
| 832 | if (lseek(arfd, mpos, SEEK_SET0) >= 0) |
| 833 | return(0); |
| 834 | } |
| 835 | syswarn(1, errno(*__errno()), "Forward positioning operation on archive failed"); |
| 836 | lstrval = -1; |
| 837 | return(-1); |
| 838 | } |
| 839 | |
| 840 | /* |
| 841 | * ar_rev() |
| 842 | * move the i/o position within the archive backwards the specified byte |
| 843 | * count as supported by the device. With tapes drives we RESET rdblksz to |
| 844 | * the PHYSICAL blocksize. |
| 845 | * NOTE: We should only be called to move backwards so we can rewrite the |
| 846 | * last records (the trailer) of an archive (APPEND). |
| 847 | * Return: |
| 848 | * 0 if moved the requested distance, -1 on complete failure |
| 849 | */ |
| 850 | |
| 851 | int |
| 852 | ar_rev(off_t sksz) |
| 853 | { |
| 854 | off_t cpos; |
| 855 | struct mtop mb; |
| 856 | int phyblk; |
| 857 | |
| 858 | /* |
| 859 | * make sure we do not have try to reverse on a flawed archive |
| 860 | */ |
| 861 | if (lstrval < 0) |
| 862 | return(lstrval); |
| 863 | |
| 864 | switch (artyp) { |
| 865 | case ISPIPE4: |
| 866 | if (sksz <= 0) |
| 867 | break; |
| 868 | /* |
| 869 | * cannot go backwards on these critters |
| 870 | */ |
| 871 | paxwarn(1, "Reverse positioning on pipes is not supported."); |
| 872 | lstrval = -1; |
| 873 | return(-1); |
| 874 | case ISREG0: |
| 875 | case ISBLK2: |
| 876 | case ISCHR1: |
| 877 | default: |
| 878 | if (sksz <= 0) |
| 879 | break; |
| 880 | |
| 881 | /* |
| 882 | * For things other than files, backwards movement has a very |
| 883 | * high probability of failure as we really do not know the |
| 884 | * true attributes of the device we are talking to (the device |
| 885 | * may not even have the ability to lseek() in any direction). |
| 886 | * First we figure out where we are in the archive. |
| 887 | */ |
| 888 | if ((cpos = lseek(arfd, 0, SEEK_CUR1)) == -1) { |
| 889 | syswarn(1, errno(*__errno()), |
| 890 | "Unable to obtain current archive byte offset"); |
| 891 | lstrval = -1; |
| 892 | return(-1); |
| 893 | } |
| 894 | |
| 895 | /* |
| 896 | * we may try to go backwards past the start when the archive |
| 897 | * is only a single record. If this happens and we are on a |
| 898 | * multi-volume archive, we need to go to the end of the |
| 899 | * previous volume and continue our movement backwards from |
| 900 | * there. |
| 901 | */ |
| 902 | if ((cpos -= sksz) < 0) { |
| 903 | if (arvol > 1) { |
| 904 | /* |
| 905 | * this should never happen |
| 906 | */ |
| 907 | paxwarn(1,"Reverse position on previous volume."); |
| 908 | lstrval = -1; |
| 909 | return(-1); |
| 910 | } |
| 911 | cpos = 0; |
| 912 | } |
| 913 | if (lseek(arfd, cpos, SEEK_SET0) == -1) { |
| 914 | syswarn(1, errno(*__errno()), "Unable to seek archive backwards"); |
| 915 | lstrval = -1; |
| 916 | return(-1); |
| 917 | } |
| 918 | break; |
| 919 | case ISTAPE3: |
| 920 | /* |
| 921 | * Calculate and move the proper number of PHYSICAL tape |
| 922 | * blocks. If the sksz is not an even multiple of the physical |
| 923 | * tape size, we cannot do the move (this should never happen). |
| 924 | * (We also cannot handle trailers spread over two vols.) |
| 925 | * get_phys() also makes sure we are in front of the filemark. |
| 926 | */ |
| 927 | if ((phyblk = get_phys()) <= 0) { |
| 928 | lstrval = -1; |
| 929 | return(-1); |
| 930 | } |
| 931 | |
| 932 | /* |
| 933 | * make sure future tape reads only go by physical tape block |
| 934 | * size (set rdblksz to the real size). |
| 935 | */ |
| 936 | rdblksz = phyblk; |
| 937 | |
| 938 | /* |
| 939 | * if no movement is required, just return (we must be after |
| 940 | * get_phys() so the physical blocksize is properly set) |
| 941 | */ |
| 942 | if (sksz <= 0) |
| 943 | break; |
| 944 | |
| 945 | /* |
| 946 | * ok we have to move. Make sure the tape drive can do it. |
| 947 | */ |
| 948 | if (sksz % phyblk) { |
| 949 | paxwarn(1, |
| 950 | "Tape drive unable to backspace requested amount"); |
| 951 | lstrval = -1; |
| 952 | return(-1); |
| 953 | } |
| 954 | |
| 955 | /* |
| 956 | * move backwards the requested number of bytes |
| 957 | */ |
| 958 | mb.mt_op = MTBSR4; |
| 959 | mb.mt_count = sksz/phyblk; |
| 960 | if (ioctl(arfd, MTIOCTOP((unsigned long)0x80000000 | ((sizeof(struct mtop) & 0x1fff ) << 16) | ((('m')) << 8) | ((1))), &mb) == -1) { |
| 961 | syswarn(1,errno(*__errno()), "Unable to backspace tape %d blocks.", |
| 962 | mb.mt_count); |
| 963 | lstrval = -1; |
| 964 | return(-1); |
| 965 | } |
| 966 | break; |
| 967 | } |
| 968 | lstrval = 1; |
| 969 | return(0); |
| 970 | } |
| 971 | |
| 972 | /* |
| 973 | * get_phys() |
| 974 | * Determine the physical block size on a tape drive. We need the physical |
| 975 | * block size so we know how many bytes we skip over when we move with |
| 976 | * mtio commands. We also make sure we are BEFORE THE TAPE FILEMARK when |
| 977 | * return. |
| 978 | * This is one really SLOW routine... |
| 979 | * Return: |
| 980 | * physical block size if ok (ok > 0), -1 otherwise |
| 981 | */ |
| 982 | |
| 983 | static int |
| 984 | get_phys(void) |
| 985 | { |
| 986 | int padsz = 0; |
| 987 | int res; |
| 988 | int phyblk; |
| 989 | struct mtop mb; |
| 990 | char scbuf[MAXBLK64512]; |
| 991 | |
| 992 | /* |
| 993 | * move to the file mark, and then back up one record and read it. |
| 994 | * this should tell us the physical record size the tape is using. |
| 995 | */ |
| 996 | if (lstrval == 1) { |
| 997 | /* |
| 998 | * we know we are at file mark when we get back a 0 from |
| 999 | * read() |
| 1000 | */ |
| 1001 | while ((res = read(arfd, scbuf, sizeof(scbuf))) > 0) |
| 1002 | padsz += res; |
| 1003 | if (res == -1) { |
| 1004 | syswarn(1, errno(*__errno()), "Unable to locate tape filemark."); |
| 1005 | return(-1); |
| 1006 | } |
| 1007 | } |
| 1008 | |
| 1009 | /* |
| 1010 | * move backwards over the file mark so we are at the end of the |
| 1011 | * last record. |
| 1012 | */ |
| 1013 | mb.mt_op = MTBSF2; |
| 1014 | mb.mt_count = 1; |
| 1015 | if (ioctl(arfd, MTIOCTOP((unsigned long)0x80000000 | ((sizeof(struct mtop) & 0x1fff ) << 16) | ((('m')) << 8) | ((1))), &mb) == -1) { |
| 1016 | syswarn(1, errno(*__errno()), "Unable to backspace over tape filemark."); |
| 1017 | return(-1); |
| 1018 | } |
| 1019 | |
| 1020 | /* |
| 1021 | * move backwards so we are in front of the last record and read it to |
| 1022 | * get physical tape blocksize. |
| 1023 | */ |
| 1024 | mb.mt_op = MTBSR4; |
| 1025 | mb.mt_count = 1; |
| 1026 | if (ioctl(arfd, MTIOCTOP((unsigned long)0x80000000 | ((sizeof(struct mtop) & 0x1fff ) << 16) | ((('m')) << 8) | ((1))), &mb) == -1) { |
| 1027 | syswarn(1, errno(*__errno()), "Unable to backspace over last tape block."); |
| 1028 | return(-1); |
| 1029 | } |
| 1030 | if ((phyblk = read(arfd, scbuf, sizeof(scbuf))) <= 0) { |
| 1031 | syswarn(1, errno(*__errno()), "Cannot determine archive tape blocksize."); |
| 1032 | return(-1); |
| 1033 | } |
| 1034 | |
| 1035 | /* |
| 1036 | * read forward to the file mark, then back up in front of the filemark |
| 1037 | * (this is a bit paranoid, but should be safe to do). |
| 1038 | */ |
| 1039 | while ((res = read(arfd, scbuf, sizeof(scbuf))) > 0) |
| 1040 | continue; |
| 1041 | if (res == -1) { |
| 1042 | syswarn(1, errno(*__errno()), "Unable to locate tape filemark."); |
| 1043 | return(-1); |
| 1044 | } |
| 1045 | mb.mt_op = MTBSF2; |
| 1046 | mb.mt_count = 1; |
| 1047 | if (ioctl(arfd, MTIOCTOP((unsigned long)0x80000000 | ((sizeof(struct mtop) & 0x1fff ) << 16) | ((('m')) << 8) | ((1))), &mb) == -1) { |
| 1048 | syswarn(1, errno(*__errno()), "Unable to backspace over tape filemark."); |
| 1049 | return(-1); |
| 1050 | } |
| 1051 | |
| 1052 | /* |
| 1053 | * set lstrval so we know that the filemark has not been seen |
| 1054 | */ |
| 1055 | lstrval = 1; |
| 1056 | |
| 1057 | /* |
| 1058 | * return if there was no padding |
| 1059 | */ |
| 1060 | if (padsz == 0) |
| 1061 | return(phyblk); |
| 1062 | |
| 1063 | /* |
| 1064 | * make sure we can move backwards over the padding. (this should |
| 1065 | * never fail). |
| 1066 | */ |
| 1067 | if (padsz % phyblk) { |
| 1068 | paxwarn(1, "Tape drive unable to backspace requested amount"); |
| 1069 | return(-1); |
| 1070 | } |
| 1071 | |
| 1072 | /* |
| 1073 | * move backwards over the padding so the head is where it was when |
| 1074 | * we were first called (if required). |
| 1075 | */ |
| 1076 | mb.mt_op = MTBSR4; |
| 1077 | mb.mt_count = padsz/phyblk; |
| 1078 | if (ioctl(arfd, MTIOCTOP((unsigned long)0x80000000 | ((sizeof(struct mtop) & 0x1fff ) << 16) | ((('m')) << 8) | ((1))), &mb) == -1) { |
| 1079 | syswarn(1,errno(*__errno()),"Unable to backspace tape over %d pad blocks", |
| 1080 | mb.mt_count); |
| 1081 | return(-1); |
| 1082 | } |
| 1083 | return(phyblk); |
| 1084 | } |
| 1085 | |
| 1086 | /* |
| 1087 | * ar_next() |
| 1088 | * prompts the user for the next volume in this archive. For some devices |
| 1089 | * we may allow the media to be changed. Otherwise a new archive is |
| 1090 | * prompted for. By pax spec, if there is no controlling tty or an eof is |
| 1091 | * read on tty input, we must quit pax. |
| 1092 | * Return: |
| 1093 | * 0 when ready to continue, -1 when all done |
| 1094 | */ |
| 1095 | |
| 1096 | int |
| 1097 | ar_next(void) |
| 1098 | { |
| 1099 | char buf[PAXPATHLEN3072+2]; |
| 1100 | static int freeit = 0; |
| 1101 | sigset_t o_mask; |
| 1102 | |
| 1103 | /* |
| 1104 | * WE MUST CLOSE THE DEVICE. A lot of devices must see last close, (so |
| 1105 | * things like writing EOF etc will be done) (Watch out ar_close() can |
| 1106 | * also be called via a signal handler, so we must prevent a race. |
| 1107 | */ |
| 1108 | if (sigprocmask(SIG_BLOCK1, &s_mask, &o_mask) == -1) |
| 1109 | syswarn(0, errno(*__errno()), "Unable to set signal mask"); |
| 1110 | ar_close(0); |
| 1111 | if (sigprocmask(SIG_SETMASK3, &o_mask, NULL((void *)0)) == -1) |
| 1112 | syswarn(0, errno(*__errno()), "Unable to restore signal mask"); |
| 1113 | |
| 1114 | if (done || !wr_trail || force_one_volume || op_mode == OP_TAR) |
| 1115 | return(-1); |
| 1116 | |
| 1117 | tty_prnt("\nATTENTION! %s archive volume change required.\n", argv0); |
| 1118 | |
| 1119 | /* |
| 1120 | * if i/o is on stdin or stdout, we cannot reopen it (we do not know |
| 1121 | * the name), the user will be forced to type it in. |
| 1122 | */ |
| 1123 | if (strcmp(arcname, STDO"<STDOUT>") && strcmp(arcname, STDN"<STDIN>") && (artyp != ISREG0) |
| 1124 | && (artyp != ISPIPE4)) { |
| 1125 | if (artyp == ISTAPE3) { |
| 1126 | tty_prnt("%s ready for archive tape volume: %d\n", |
| 1127 | arcname, arvol); |
| 1128 | tty_prnt("Load the NEXT TAPE on the tape drive"); |
| 1129 | } else { |
| 1130 | tty_prnt("%s ready for archive volume: %d\n", |
| 1131 | arcname, arvol); |
| 1132 | tty_prnt("Load the NEXT STORAGE MEDIA (if required)"); |
| 1133 | } |
| 1134 | |
| 1135 | if ((act == ARCHIVE2) || (act == APPND3)) |
| 1136 | tty_prnt(" and make sure it is WRITE ENABLED.\n"); |
| 1137 | else |
| 1138 | tty_prnt("\n"); |
| 1139 | |
| 1140 | for (;;) { |
| 1141 | tty_prnt("Type \"y\" to continue, \".\" to quit %s,", |
| 1142 | argv0); |
| 1143 | tty_prnt(" or \"s\" to switch to new device.\nIf you"); |
| 1144 | tty_prnt(" cannot change storage media, type \"s\"\n"); |
| 1145 | tty_prnt("Is the device ready and online? > "); |
| 1146 | |
| 1147 | if ((tty_read(buf,sizeof(buf))<0) || !strcmp(buf,".")){ |
| 1148 | done = 1; |
| 1149 | lstrval = -1; |
| 1150 | tty_prnt("Quitting %s!\n", argv0); |
| 1151 | vfpart = 0; |
| 1152 | return(-1); |
| 1153 | } |
| 1154 | |
| 1155 | if ((buf[0] == '\0') || (buf[1] != '\0')) { |
| 1156 | tty_prnt("%s unknown command, try again\n",buf); |
| 1157 | continue; |
| 1158 | } |
| 1159 | |
| 1160 | switch (buf[0]) { |
| 1161 | case 'y': |
| 1162 | case 'Y': |
| 1163 | /* |
| 1164 | * we are to continue with the same device |
| 1165 | */ |
| 1166 | if (ar_open(arcname) >= 0) |
| 1167 | return(0); |
| 1168 | tty_prnt("Cannot re-open %s, try again\n", |
| 1169 | arcname); |
| 1170 | continue; |
| 1171 | case 's': |
| 1172 | case 'S': |
| 1173 | /* |
| 1174 | * user wants to open a different device |
| 1175 | */ |
| 1176 | tty_prnt("Switching to a different archive\n"); |
| 1177 | break; |
| 1178 | default: |
| 1179 | tty_prnt("%s unknown command, try again\n",buf); |
| 1180 | continue; |
| 1181 | } |
| 1182 | break; |
| 1183 | } |
| 1184 | } else |
| 1185 | tty_prnt("Ready for archive volume: %d\n", arvol); |
| 1186 | |
| 1187 | /* |
| 1188 | * have to go to a different archive |
| 1189 | */ |
| 1190 | for (;;) { |
| 1191 | tty_prnt("Input archive name or \".\" to quit %s.\n", argv0); |
| 1192 | tty_prnt("Archive name > "); |
| 1193 | |
| 1194 | if ((tty_read(buf, sizeof(buf)) < 0) || !strcmp(buf, ".")) { |
| 1195 | done = 1; |
| 1196 | lstrval = -1; |
| 1197 | tty_prnt("Quitting %s!\n", argv0); |
| 1198 | vfpart = 0; |
| 1199 | return(-1); |
| 1200 | } |
| 1201 | if (buf[0] == '\0') { |
| 1202 | tty_prnt("Empty file name, try again\n"); |
| 1203 | continue; |
| 1204 | } |
| 1205 | if (!strcmp(buf, "..")) { |
| 1206 | tty_prnt("Illegal file name: .. try again\n"); |
| 1207 | continue; |
| 1208 | } |
| 1209 | if (strlen(buf) > PAXPATHLEN3072) { |
| 1210 | tty_prnt("File name too long, try again\n"); |
| 1211 | continue; |
| 1212 | } |
| 1213 | |
| 1214 | /* |
| 1215 | * try to open new archive |
| 1216 | */ |
| 1217 | if (ar_open(buf) >= 0) { |
| 1218 | if (freeit) { |
| 1219 | free((char *)arcname); |
| 1220 | freeit = 0; |
| 1221 | } |
| 1222 | if ((arcname = strdup(buf)) == NULL((void *)0)) { |
| 1223 | done = 1; |
| 1224 | lstrval = -1; |
| 1225 | paxwarn(0, "Cannot save archive name."); |
| 1226 | return(-1); |
| 1227 | } |
| 1228 | freeit = 1; |
| 1229 | break; |
| 1230 | } |
| 1231 | tty_prnt("Cannot open %s, try again\n", buf); |
| 1232 | continue; |
| 1233 | } |
| 1234 | return(0); |
| 1235 | } |
| 1236 | |
| 1237 | /* |
| 1238 | * ar_start_gzip() |
| 1239 | * starts the gzip compression/decompression process as a child, using magic |
| 1240 | * to keep the fd the same in the calling function (parent). |
| 1241 | */ |
| 1242 | void |
| 1243 | ar_start_gzip(int fd, const char *path, int wr) |
| 1244 | { |
| 1245 | int fds[2]; |
| 1246 | const char *gzip_flags; |
| 1247 | |
| 1248 | if (pipe(fds) == -1) |
| 1249 | err(1, "could not pipe"); |
| 1250 | zpid = fork(); |
| 1251 | if (zpid == -1) |
| 1252 | err(1, "could not fork"); |
| 1253 | |
| 1254 | /* parent */ |
| 1255 | if (zpid) { |
| 1256 | if (wr) |
| 1257 | dup2(fds[1], fd); |
| 1258 | else |
| 1259 | dup2(fds[0], fd); |
| 1260 | close(fds[0]); |
| 1261 | close(fds[1]); |
| 1262 | |
| 1263 | if (pmode == 0 || (act != EXTRACT1 && act != COPY4)) { |
| 1264 | if (pledge("stdio rpath wpath cpath fattr dpath getpw proc tape", |
| 1265 | NULL((void *)0)) == -1) |
| 1266 | err(1, "pledge"); |
| 1267 | } |
| 1268 | } else { |
| 1269 | if (wr) { |
| 1270 | dup2(fds[0], STDIN_FILENO0); |
| 1271 | dup2(fd, STDOUT_FILENO1); |
| 1272 | gzip_flags = "-c"; |
| 1273 | } else { |
| 1274 | dup2(fds[1], STDOUT_FILENO1); |
| 1275 | dup2(fd, STDIN_FILENO0); |
| 1276 | gzip_flags = "-dc"; |
| 1277 | } |
| 1278 | close(fds[0]); |
| 1279 | close(fds[1]); |
| 1280 | |
| 1281 | /* System compressors are more likely to use pledge(2) */ |
| 1282 | putenv("PATH=/usr/bin:/usr/local/bin"); |
| 1283 | |
| 1284 | if (execlp(path, path, gzip_flags, (char *)NULL((void *)0)) == -1) |
| 1285 | err(1, "could not exec %s", path); |
| 1286 | /* NOTREACHED */ |
| 1287 | } |
| 1288 | } |