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