1/*- 2 * Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies). 3 * Author: Jonas Gastal <jgastal@profusion.mobi> 4 * Copyright (c) 2011-2012 Michihiro NAKAJIMA 5 * 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29#include "archive_platform.h" 30__FBSDID("$FreeBSD: head/lib/libarchive/archive_write_set_format_gnu_tar.c 191579 2009-04-27 18:35:03Z gastal $"); 31 32 33#ifdef HAVE_ERRNO_H 34#include <errno.h> 35#endif 36#include <stdio.h> 37#ifdef HAVE_STDLIB_H 38#include <stdlib.h> 39#endif 40#ifdef HAVE_STRING_H 41#include <string.h> 42#endif 43 44#include "archive.h" 45#include "archive_entry.h" 46#include "archive_entry_locale.h" 47#include "archive_private.h" 48#include "archive_write_private.h" 49#include "archive_write_set_format_private.h" 50 51struct gnutar { 52 uint64_t entry_bytes_remaining; 53 uint64_t entry_padding; 54 const char * linkname; 55 size_t linkname_length; 56 const char * pathname; 57 size_t pathname_length; 58 const char * uname; 59 size_t uname_length; 60 const char * gname; 61 size_t gname_length; 62 struct archive_string_conv *opt_sconv; 63 struct archive_string_conv *sconv_default; 64 int init_default_conversion; 65}; 66 67/* 68 * Define structure of GNU tar header. 69 */ 70#define GNUTAR_name_offset 0 71#define GNUTAR_name_size 100 72#define GNUTAR_mode_offset 100 73#define GNUTAR_mode_size 7 74#define GNUTAR_mode_max_size 8 75#define GNUTAR_uid_offset 108 76#define GNUTAR_uid_size 7 77#define GNUTAR_uid_max_size 8 78#define GNUTAR_gid_offset 116 79#define GNUTAR_gid_size 7 80#define GNUTAR_gid_max_size 8 81#define GNUTAR_size_offset 124 82#define GNUTAR_size_size 11 83#define GNUTAR_size_max_size 12 84#define GNUTAR_mtime_offset 136 85#define GNUTAR_mtime_size 11 86#define GNUTAR_mtime_max_size 11 87#define GNUTAR_checksum_offset 148 88#define GNUTAR_checksum_size 8 89#define GNUTAR_typeflag_offset 156 90#define GNUTAR_typeflag_size 1 91#define GNUTAR_linkname_offset 157 92#define GNUTAR_linkname_size 100 93#define GNUTAR_magic_offset 257 94#define GNUTAR_magic_size 6 95#define GNUTAR_version_offset 263 96#define GNUTAR_version_size 2 97#define GNUTAR_uname_offset 265 98#define GNUTAR_uname_size 32 99#define GNUTAR_gname_offset 297 100#define GNUTAR_gname_size 32 101#define GNUTAR_rdevmajor_offset 329 102#define GNUTAR_rdevmajor_size 6 103#define GNUTAR_rdevmajor_max_size 8 104#define GNUTAR_rdevminor_offset 337 105#define GNUTAR_rdevminor_size 6 106#define GNUTAR_rdevminor_max_size 8 107 108/* 109 * A filled-in copy of the header for initialization. 110 */ 111static const char template_header[] = { 112 /* name: 100 bytes */ 113 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 114 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 115 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 116 0,0,0,0, 117 /* Mode, null termination: 8 bytes */ 118 '0','0','0','0','0','0', '0','\0', 119 /* uid, null termination: 8 bytes */ 120 '0','0','0','0','0','0', '0','\0', 121 /* gid, null termination: 8 bytes */ 122 '0','0','0','0','0','0', '0','\0', 123 /* size, space termination: 12 bytes */ 124 '0','0','0','0','0','0','0','0','0','0','0', '\0', 125 /* mtime, space termination: 12 bytes */ 126 '0','0','0','0','0','0','0','0','0','0','0', '\0', 127 /* Initial checksum value: 8 spaces */ 128 ' ',' ',' ',' ',' ',' ',' ',' ', 129 /* Typeflag: 1 byte */ 130 '0', /* '0' = regular file */ 131 /* Linkname: 100 bytes */ 132 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 133 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 134 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 135 0,0,0,0, 136 /* Magic: 8 bytes */ 137 'u','s','t','a','r',' ', ' ','\0', 138 /* Uname: 32 bytes */ 139 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 140 /* Gname: 32 bytes */ 141 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 142 /* rdevmajor + null padding: 8 bytes */ 143 '\0','\0','\0','\0','\0','\0', '\0','\0', 144 /* rdevminor + null padding: 8 bytes */ 145 '\0','\0','\0','\0','\0','\0', '\0','\0', 146 /* Padding: 167 bytes */ 147 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 148 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 149 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 150 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 151 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 152 0,0,0,0,0,0,0 153}; 154 155static int archive_write_gnutar_options(struct archive_write *, 156 const char *, const char *); 157static int archive_format_gnutar_header(struct archive_write *, char h[512], 158 struct archive_entry *, int tartype); 159static int archive_write_gnutar_header(struct archive_write *, 160 struct archive_entry *entry); 161static ssize_t archive_write_gnutar_data(struct archive_write *a, const void *buff, 162 size_t s); 163static int archive_write_gnutar_free(struct archive_write *); 164static int archive_write_gnutar_close(struct archive_write *); 165static int archive_write_gnutar_finish_entry(struct archive_write *); 166static int format_256(int64_t, char *, int); 167static int format_number(int64_t, char *, int size, int maxsize); 168static int format_octal(int64_t, char *, int); 169 170/* 171 * Set output format to 'GNU tar' format. 172 */ 173int 174archive_write_set_format_gnutar(struct archive *_a) 175{ 176 struct archive_write *a = (struct archive_write *)_a; 177 struct gnutar *gnutar; 178 179 gnutar = (struct gnutar *)calloc(1, sizeof(*gnutar)); 180 if (gnutar == NULL) { 181 archive_set_error(&a->archive, ENOMEM, 182 "Can't allocate gnutar data"); 183 return (ARCHIVE_FATAL); 184 } 185 a->format_data = gnutar; 186 a->format_name = "gnutar"; 187 a->format_options = archive_write_gnutar_options; 188 a->format_write_header = archive_write_gnutar_header; 189 a->format_write_data = archive_write_gnutar_data; 190 a->format_close = archive_write_gnutar_close; 191 a->format_free = archive_write_gnutar_free; 192 a->format_finish_entry = archive_write_gnutar_finish_entry; 193 a->archive.archive_format = ARCHIVE_FORMAT_TAR_GNUTAR; 194 a->archive.archive_format_name = "GNU tar"; 195 return (ARCHIVE_OK); 196} 197 198static int 199archive_write_gnutar_options(struct archive_write *a, const char *key, 200 const char *val) 201{ 202 struct gnutar *gnutar = (struct gnutar *)a->format_data; 203 int ret = ARCHIVE_FAILED; 204 205 if (strcmp(key, "hdrcharset") == 0) { 206 if (val == NULL || val[0] == 0) 207 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 208 "%s: hdrcharset option needs a character-set name", 209 a->format_name); 210 else { 211 gnutar->opt_sconv = archive_string_conversion_to_charset( 212 &a->archive, val, 0); 213 if (gnutar->opt_sconv != NULL) 214 ret = ARCHIVE_OK; 215 else 216 ret = ARCHIVE_FATAL; 217 } 218 return (ret); 219 } 220 221 /* Note: The "warn" return is just to inform the options 222 * supervisor that we didn't handle it. It will generate 223 * a suitable error if no one used this option. */ 224 return (ARCHIVE_WARN); 225} 226 227static int 228archive_write_gnutar_close(struct archive_write *a) 229{ 230 return (__archive_write_nulls(a, 512*2)); 231} 232 233static int 234archive_write_gnutar_free(struct archive_write *a) 235{ 236 struct gnutar *gnutar; 237 238 gnutar = (struct gnutar *)a->format_data; 239 free(gnutar); 240 a->format_data = NULL; 241 return (ARCHIVE_OK); 242} 243 244static int 245archive_write_gnutar_finish_entry(struct archive_write *a) 246{ 247 struct gnutar *gnutar; 248 int ret; 249 250 gnutar = (struct gnutar *)a->format_data; 251 ret = __archive_write_nulls(a, (size_t) 252 (gnutar->entry_bytes_remaining + gnutar->entry_padding)); 253 gnutar->entry_bytes_remaining = gnutar->entry_padding = 0; 254 return (ret); 255} 256 257static ssize_t 258archive_write_gnutar_data(struct archive_write *a, const void *buff, size_t s) 259{ 260 struct gnutar *gnutar; 261 int ret; 262 263 gnutar = (struct gnutar *)a->format_data; 264 if (s > gnutar->entry_bytes_remaining) 265 s = (size_t)gnutar->entry_bytes_remaining; 266 ret = __archive_write_output(a, buff, s); 267 gnutar->entry_bytes_remaining -= s; 268 if (ret != ARCHIVE_OK) 269 return (ret); 270 return (s); 271} 272 273static int 274archive_write_gnutar_header(struct archive_write *a, 275 struct archive_entry *entry) 276{ 277 char buff[512]; 278 int r, ret, ret2 = ARCHIVE_OK; 279 int tartype; 280 struct gnutar *gnutar; 281 struct archive_string_conv *sconv; 282 struct archive_entry *entry_main; 283 284 gnutar = (struct gnutar *)a->format_data; 285 286 /* Setup default string conversion. */ 287 if (gnutar->opt_sconv == NULL) { 288 if (!gnutar->init_default_conversion) { 289 gnutar->sconv_default = 290 archive_string_default_conversion_for_write( 291 &(a->archive)); 292 gnutar->init_default_conversion = 1; 293 } 294 sconv = gnutar->sconv_default; 295 } else 296 sconv = gnutar->opt_sconv; 297 298 /* Only regular files (not hardlinks) have data. */ 299 if (archive_entry_hardlink(entry) != NULL || 300 archive_entry_symlink(entry) != NULL || 301 !(archive_entry_filetype(entry) == AE_IFREG)) 302 archive_entry_set_size(entry, 0); 303 304 if (AE_IFDIR == archive_entry_filetype(entry)) { 305 const char *p; 306 size_t path_length; 307 /* 308 * Ensure a trailing '/'. Modify the entry so 309 * the client sees the change. 310 */ 311#if defined(_WIN32) && !defined(__CYGWIN__) 312 const wchar_t *wp; 313 314 wp = archive_entry_pathname_w(entry); 315 if (wp != NULL && wp[wcslen(wp) -1] != L'/') { 316 struct archive_wstring ws; 317 318 archive_string_init(&ws); 319 path_length = wcslen(wp); 320 if (archive_wstring_ensure(&ws, 321 path_length + 2) == NULL) { 322 archive_set_error(&a->archive, ENOMEM, 323 "Can't allocate ustar data"); 324 archive_wstring_free(&ws); 325 return(ARCHIVE_FATAL); 326 } 327 /* Should we keep '\' ? */ 328 if (wp[path_length -1] == L'\\') 329 path_length--; 330 archive_wstrncpy(&ws, wp, path_length); 331 archive_wstrappend_wchar(&ws, L'/'); 332 archive_entry_copy_pathname_w(entry, ws.s); 333 archive_wstring_free(&ws); 334 p = NULL; 335 } else 336#endif 337 p = archive_entry_pathname(entry); 338 /* 339 * On Windows, this is a backup operation just in 340 * case getting WCS failed. On POSIX, this is a 341 * normal operation. 342 */ 343 if (p != NULL && p[0] != '\0' && p[strlen(p) - 1] != '/') { 344 struct archive_string as; 345 346 archive_string_init(&as); 347 path_length = strlen(p); 348 if (archive_string_ensure(&as, 349 path_length + 2) == NULL) { 350 archive_set_error(&a->archive, ENOMEM, 351 "Can't allocate ustar data"); 352 archive_string_free(&as); 353 return(ARCHIVE_FATAL); 354 } 355#if defined(_WIN32) && !defined(__CYGWIN__) 356 /* NOTE: This might break the pathname 357 * if the current code page is CP932 and 358 * the pathname includes a character '\' 359 * as a part of its multibyte pathname. */ 360 if (p[strlen(p) -1] == '\\') 361 path_length--; 362 else 363#endif 364 archive_strncpy(&as, p, path_length); 365 archive_strappend_char(&as, '/'); 366 archive_entry_copy_pathname(entry, as.s); 367 archive_string_free(&as); 368 } 369 } 370 371#if defined(_WIN32) && !defined(__CYGWIN__) 372 /* Make sure the path separators in pathname, hardlink and symlink 373 * are all slash '/', not the Windows path separator '\'. */ 374 entry_main = __la_win_entry_in_posix_pathseparator(entry); 375 if (entry_main == NULL) { 376 archive_set_error(&a->archive, ENOMEM, 377 "Can't allocate ustar data"); 378 return(ARCHIVE_FATAL); 379 } 380 if (entry != entry_main) 381 entry = entry_main; 382 else 383 entry_main = NULL; 384#else 385 entry_main = NULL; 386#endif 387 r = archive_entry_pathname_l(entry, &(gnutar->pathname), 388 &(gnutar->pathname_length), sconv); 389 if (r != 0) { 390 if (errno == ENOMEM) { 391 archive_set_error(&a->archive, ENOMEM, 392 "Can't allocate memory for Pathame"); 393 ret = ARCHIVE_FATAL; 394 goto exit_write_header; 395 } 396 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 397 "Can't translate pathname '%s' to %s", 398 archive_entry_pathname(entry), 399 archive_string_conversion_charset_name(sconv)); 400 ret2 = ARCHIVE_WARN; 401 } 402 r = archive_entry_uname_l(entry, &(gnutar->uname), 403 &(gnutar->uname_length), sconv); 404 if (r != 0) { 405 if (errno == ENOMEM) { 406 archive_set_error(&a->archive, ENOMEM, 407 "Can't allocate memory for Uname"); 408 ret = ARCHIVE_FATAL; 409 goto exit_write_header; 410 } 411 archive_set_error(&a->archive, 412 ARCHIVE_ERRNO_FILE_FORMAT, 413 "Can't translate uname '%s' to %s", 414 archive_entry_uname(entry), 415 archive_string_conversion_charset_name(sconv)); 416 ret2 = ARCHIVE_WARN; 417 } 418 r = archive_entry_gname_l(entry, &(gnutar->gname), 419 &(gnutar->gname_length), sconv); 420 if (r != 0) { 421 if (errno == ENOMEM) { 422 archive_set_error(&a->archive, ENOMEM, 423 "Can't allocate memory for Gname"); 424 ret = ARCHIVE_FATAL; 425 goto exit_write_header; 426 } 427 archive_set_error(&a->archive, 428 ARCHIVE_ERRNO_FILE_FORMAT, 429 "Can't translate gname '%s' to %s", 430 archive_entry_gname(entry), 431 archive_string_conversion_charset_name(sconv)); 432 ret2 = ARCHIVE_WARN; 433 } 434 435 /* If linkname is longer than 100 chars we need to add a 'K' header. */ 436 r = archive_entry_hardlink_l(entry, &(gnutar->linkname), 437 &(gnutar->linkname_length), sconv); 438 if (r != 0) { 439 if (errno == ENOMEM) { 440 archive_set_error(&a->archive, ENOMEM, 441 "Can't allocate memory for Linkname"); 442 ret = ARCHIVE_FATAL; 443 goto exit_write_header; 444 } 445 archive_set_error(&a->archive, 446 ARCHIVE_ERRNO_FILE_FORMAT, 447 "Can't translate linkname '%s' to %s", 448 archive_entry_hardlink(entry), 449 archive_string_conversion_charset_name(sconv)); 450 ret2 = ARCHIVE_WARN; 451 } 452 if (gnutar->linkname_length == 0) { 453 r = archive_entry_symlink_l(entry, &(gnutar->linkname), 454 &(gnutar->linkname_length), sconv); 455 if (r != 0) { 456 if (errno == ENOMEM) { 457 archive_set_error(&a->archive, ENOMEM, 458 "Can't allocate memory for Linkname"); 459 ret = ARCHIVE_FATAL; 460 goto exit_write_header; 461 } 462 archive_set_error(&a->archive, 463 ARCHIVE_ERRNO_FILE_FORMAT, 464 "Can't translate linkname '%s' to %s", 465 archive_entry_hardlink(entry), 466 archive_string_conversion_charset_name(sconv)); 467 ret2 = ARCHIVE_WARN; 468 } 469 } 470 if (gnutar->linkname_length > GNUTAR_linkname_size) { 471 size_t length = gnutar->linkname_length + 1; 472 struct archive_entry *temp = archive_entry_new2(&a->archive); 473 474 /* Uname/gname here don't really matter since no one reads them; 475 * these are the values that GNU tar happens to use on FreeBSD. */ 476 archive_entry_set_uname(temp, "root"); 477 archive_entry_set_gname(temp, "wheel"); 478 479 archive_entry_set_pathname(temp, "././@LongLink"); 480 archive_entry_set_size(temp, length); 481 ret = archive_format_gnutar_header(a, buff, temp, 'K'); 482 archive_entry_free(temp); 483 if (ret < ARCHIVE_WARN) 484 goto exit_write_header; 485 ret = __archive_write_output(a, buff, 512); 486 if (ret < ARCHIVE_WARN) 487 goto exit_write_header; 488 /* Write name and trailing null byte. */ 489 ret = __archive_write_output(a, gnutar->linkname, length); 490 if (ret < ARCHIVE_WARN) 491 goto exit_write_header; 492 /* Pad to 512 bytes */ 493 ret = __archive_write_nulls(a, 0x1ff & (-(ssize_t)length)); 494 if (ret < ARCHIVE_WARN) 495 goto exit_write_header; 496 } 497 498 /* If pathname is longer than 100 chars we need to add an 'L' header. */ 499 if (gnutar->pathname_length > GNUTAR_name_size) { 500 const char *pathname = gnutar->pathname; 501 size_t length = gnutar->pathname_length + 1; 502 struct archive_entry *temp = archive_entry_new2(&a->archive); 503 504 /* Uname/gname here don't really matter since no one reads them; 505 * these are the values that GNU tar happens to use on FreeBSD. */ 506 archive_entry_set_uname(temp, "root"); 507 archive_entry_set_gname(temp, "wheel"); 508 509 archive_entry_set_pathname(temp, "././@LongLink"); 510 archive_entry_set_size(temp, length); 511 ret = archive_format_gnutar_header(a, buff, temp, 'L'); 512 archive_entry_free(temp); 513 if (ret < ARCHIVE_WARN) 514 goto exit_write_header; 515 ret = __archive_write_output(a, buff, 512); 516 if(ret < ARCHIVE_WARN) 517 goto exit_write_header; 518 /* Write pathname + trailing null byte. */ 519 ret = __archive_write_output(a, pathname, length); 520 if(ret < ARCHIVE_WARN) 521 goto exit_write_header; 522 /* Pad to multiple of 512 bytes. */ 523 ret = __archive_write_nulls(a, 0x1ff & (-(ssize_t)length)); 524 if (ret < ARCHIVE_WARN) 525 goto exit_write_header; 526 } 527 528 if (archive_entry_hardlink(entry) != NULL) { 529 tartype = '1'; 530 } else 531 switch (archive_entry_filetype(entry)) { 532 case AE_IFREG: tartype = '0' ; break; 533 case AE_IFLNK: tartype = '2' ; break; 534 case AE_IFCHR: tartype = '3' ; break; 535 case AE_IFBLK: tartype = '4' ; break; 536 case AE_IFDIR: tartype = '5' ; break; 537 case AE_IFIFO: tartype = '6' ; break; 538 default: /* AE_IFSOCK and unknown */ 539 __archive_write_entry_filetype_unsupported( 540 &a->archive, entry, "gnutar"); 541 ret = ARCHIVE_FAILED; 542 goto exit_write_header; 543 } 544 545 ret = archive_format_gnutar_header(a, buff, entry, tartype); 546 if (ret < ARCHIVE_WARN) 547 goto exit_write_header; 548 if (ret2 < ret) 549 ret = ret2; 550 ret2 = __archive_write_output(a, buff, 512); 551 if (ret2 < ARCHIVE_WARN) { 552 ret = ret2; 553 goto exit_write_header; 554 } 555 if (ret2 < ret) 556 ret = ret2; 557 558 gnutar->entry_bytes_remaining = archive_entry_size(entry); 559 gnutar->entry_padding = 0x1ff & (-(int64_t)gnutar->entry_bytes_remaining); 560exit_write_header: 561 archive_entry_free(entry_main); 562 return (ret); 563} 564 565static int 566archive_format_gnutar_header(struct archive_write *a, char h[512], 567 struct archive_entry *entry, int tartype) 568{ 569 unsigned int checksum; 570 int i, ret; 571 size_t copy_length; 572 const char *p; 573 struct gnutar *gnutar; 574 575 gnutar = (struct gnutar *)a->format_data; 576 577 ret = 0; 578 579 /* 580 * The "template header" already includes the signature, 581 * various end-of-field markers, and other required elements. 582 */ 583 memcpy(h, &template_header, 512); 584 585 /* 586 * Because the block is already null-filled, and strings 587 * are allowed to exactly fill their destination (without null), 588 * I use memcpy(dest, src, strlen()) here a lot to copy strings. 589 */ 590 591 if (tartype == 'K' || tartype == 'L') { 592 p = archive_entry_pathname(entry); 593 copy_length = strlen(p); 594 } else { 595 p = gnutar->pathname; 596 copy_length = gnutar->pathname_length; 597 } 598 if (copy_length > GNUTAR_name_size) 599 copy_length = GNUTAR_name_size; 600 memcpy(h + GNUTAR_name_offset, p, copy_length); 601 602 if ((copy_length = gnutar->linkname_length) > 0) { 603 if (copy_length > GNUTAR_linkname_size) 604 copy_length = GNUTAR_linkname_size; 605 memcpy(h + GNUTAR_linkname_offset, gnutar->linkname, 606 copy_length); 607 } 608 609 /* TODO: How does GNU tar handle unames longer than GNUTAR_uname_size? */ 610 if (tartype == 'K' || tartype == 'L') { 611 p = archive_entry_uname(entry); 612 copy_length = strlen(p); 613 } else { 614 p = gnutar->uname; 615 copy_length = gnutar->uname_length; 616 } 617 if (copy_length > 0) { 618 if (copy_length > GNUTAR_uname_size) 619 copy_length = GNUTAR_uname_size; 620 memcpy(h + GNUTAR_uname_offset, p, copy_length); 621 } 622 623 /* TODO: How does GNU tar handle gnames longer than GNUTAR_gname_size? */ 624 if (tartype == 'K' || tartype == 'L') { 625 p = archive_entry_gname(entry); 626 copy_length = strlen(p); 627 } else { 628 p = gnutar->gname; 629 copy_length = gnutar->gname_length; 630 } 631 if (copy_length > 0) { 632 if (strlen(p) > GNUTAR_gname_size) 633 copy_length = GNUTAR_gname_size; 634 memcpy(h + GNUTAR_gname_offset, p, copy_length); 635 } 636 637 /* By truncating the mode here, we ensure it always fits. */ 638 format_octal(archive_entry_mode(entry) & 07777, 639 h + GNUTAR_mode_offset, GNUTAR_mode_size); 640 641 /* GNU tar supports base-256 here, so should never overflow. */ 642 if (format_number(archive_entry_uid(entry), h + GNUTAR_uid_offset, 643 GNUTAR_uid_size, GNUTAR_uid_max_size)) { 644 archive_set_error(&a->archive, ERANGE, 645 "Numeric user ID %jd too large", 646 (intmax_t)archive_entry_uid(entry)); 647 ret = ARCHIVE_FAILED; 648 } 649 650 /* GNU tar supports base-256 here, so should never overflow. */ 651 if (format_number(archive_entry_gid(entry), h + GNUTAR_gid_offset, 652 GNUTAR_gid_size, GNUTAR_gid_max_size)) { 653 archive_set_error(&a->archive, ERANGE, 654 "Numeric group ID %jd too large", 655 (intmax_t)archive_entry_gid(entry)); 656 ret = ARCHIVE_FAILED; 657 } 658 659 /* GNU tar supports base-256 here, so should never overflow. */ 660 if (format_number(archive_entry_size(entry), h + GNUTAR_size_offset, 661 GNUTAR_size_size, GNUTAR_size_max_size)) { 662 archive_set_error(&a->archive, ERANGE, 663 "File size out of range"); 664 ret = ARCHIVE_FAILED; 665 } 666 667 /* Shouldn't overflow before 2106, since mtime field is 33 bits. */ 668 format_octal(archive_entry_mtime(entry), 669 h + GNUTAR_mtime_offset, GNUTAR_mtime_size); 670 671 if (archive_entry_filetype(entry) == AE_IFBLK 672 || archive_entry_filetype(entry) == AE_IFCHR) { 673 if (format_octal(archive_entry_rdevmajor(entry), 674 h + GNUTAR_rdevmajor_offset, 675 GNUTAR_rdevmajor_size)) { 676 archive_set_error(&a->archive, ERANGE, 677 "Major device number too large"); 678 ret = ARCHIVE_FAILED; 679 } 680 681 if (format_octal(archive_entry_rdevminor(entry), 682 h + GNUTAR_rdevminor_offset, 683 GNUTAR_rdevminor_size)) { 684 archive_set_error(&a->archive, ERANGE, 685 "Minor device number too large"); 686 ret = ARCHIVE_FAILED; 687 } 688 } 689 690 h[GNUTAR_typeflag_offset] = tartype; 691 692 checksum = 0; 693 for (i = 0; i < 512; i++) 694 checksum += 255 & (unsigned int)h[i]; 695 h[GNUTAR_checksum_offset + 6] = '\0'; /* Can't be pre-set in the template. */ 696 /* h[GNUTAR_checksum_offset + 7] = ' '; */ /* This is pre-set in the template. */ 697 format_octal(checksum, h + GNUTAR_checksum_offset, 6); 698 return (ret); 699} 700 701/* 702 * Format a number into a field, falling back to base-256 if necessary. 703 */ 704static int 705format_number(int64_t v, char *p, int s, int maxsize) 706{ 707 int64_t limit = ((int64_t)1 << (s*3)); 708 709 if (v < limit) 710 return (format_octal(v, p, s)); 711 return (format_256(v, p, maxsize)); 712} 713 714/* 715 * Format a number into the specified field using base-256. 716 */ 717static int 718format_256(int64_t v, char *p, int s) 719{ 720 p += s; 721 while (s-- > 0) { 722 *--p = (char)(v & 0xff); 723 v >>= 8; 724 } 725 *p |= 0x80; /* Set the base-256 marker bit. */ 726 return (0); 727} 728 729/* 730 * Format a number into the specified field using octal. 731 */ 732static int 733format_octal(int64_t v, char *p, int s) 734{ 735 int len = s; 736 737 /* Octal values can't be negative, so use 0. */ 738 if (v < 0) 739 v = 0; 740 741 p += s; /* Start at the end and work backwards. */ 742 while (s-- > 0) { 743 *--p = (char)('0' + (v & 7)); 744 v >>= 3; 745 } 746 747 if (v == 0) 748 return (0); 749 750 /* If it overflowed, fill field with max value. */ 751 while (len-- > 0) 752 *p++ = '7'; 753 754 return (-1); 755} 756