external/bsd/libarchive/dist/libarchive/archive_write.c

   1 /*-
   2  * Copyright (c) 2003-2007 Tim Kientzle
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
  15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  17  * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
  18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "archive_platform.h"
  27 __FBSDID("$FreeBSD: head/lib/libarchive/archive_write.c 201099 2009-12-28 03:03:00Z kientzle $");
  28
  29 /*
  30  * This file contains the "essential" portions of the write API, that
  31  * is, stuff that will essentially always be used by any client that
  32  * actually needs to write a archive.  Optional pieces have been, as
  33  * far as possible, separated out into separate files to reduce
  34  * needlessly bloating statically-linked clients.
  35  */
  36
  37 #ifdef HAVE_SYS_WAIT_H
  38 #include <sys/wait.h>
  39 #endif
  40 #ifdef HAVE_LIMITS_H
  41 #include <limits.h>
  42 #endif
  43 #include <stdio.h>
  44 #ifdef HAVE_STDLIB_H
  45 #include <stdlib.h>
  46 #endif
  47 #ifdef HAVE_STRING_H
  48 #include <string.h>
  49 #endif
  50 #include <time.h>
  51 #ifdef HAVE_UNISTD_H
  52 #include <unistd.h>
  53 #endif
  54
  55 #include "archive.h"
  56 #include "archive_entry.h"
  57 #include "archive_private.h"
  58 #include "archive_write_private.h"
  59
  60 static struct archive_vtable *archive_write_vtable(void);
  61
  62 static int      _archive_write_close(struct archive *);
  63 static int      _archive_write_finish(struct archive *);
  64 static int      _archive_write_header(struct archive *, struct archive_entry *);
  65 static int      _archive_write_finish_entry(struct archive *);
  66 static ssize_t  _archive_write_data(struct archive *, const void *, size_t);
  67
  68 static struct archive_vtable *
  69 archive_write_vtable(void)
  70 {
  71         static struct archive_vtable av;
  72         static int inited = 0;
  73
  74         if (!inited) {
  75                 av.archive_close = _archive_write_close;
  76                 av.archive_finish = _archive_write_finish;
  77                 av.archive_write_header = _archive_write_header;
  78                 av.archive_write_finish_entry = _archive_write_finish_entry;
  79                 av.archive_write_data = _archive_write_data;
  80         }
  81         return (&av);
  82 }
  83
  84 /*
  85  * Allocate, initialize and return an archive object.
  86  */
  87 struct archive *
  88 archive_write_new(void)
  89 {
  90         struct archive_write *a;
  91         unsigned char *nulls;
  92
  93         a = (struct archive_write *)malloc(sizeof(*a));
  94         if (a == NULL)
  95                 return (NULL);
  96         memset(a, 0, sizeof(*a));
  97         a->archive.magic = ARCHIVE_WRITE_MAGIC;
  98         a->archive.state = ARCHIVE_STATE_NEW;
  99         a->archive.vtable = archive_write_vtable();
 100         /*
 101          * The value 10240 here matches the traditional tar default,
 102          * but is otherwise arbitrary.
 103          * TODO: Set the default block size from the format selected.
 104          */
 105         a->bytes_per_block = 10240;
 106         a->bytes_in_last_block = -1;    /* Default */
 107
 108         /* Initialize a block of nulls for padding purposes. */
 109         a->null_length = 1024;
 110         nulls = (unsigned char *)malloc(a->null_length);
 111         if (nulls == NULL) {
 112                 free(a);
 113                 return (NULL);
 114         }
 115         memset(nulls, 0, a->null_length);
 116         a->nulls = nulls;
 117         /*
 118          * Set default compression, but don't set a default format.
 119          * Were we to set a default format here, we would force every
 120          * client to link in support for that format, even if they didn't
 121          * ever use it.
 122          */
 123         archive_write_set_compression_none(&a->archive);
 124         return (&a->archive);
 125 }
 126
 127 /*
 128  * Set write options for the format. Returns 0 if successful.
 129  */
 130 int
 131 archive_write_set_format_options(struct archive *_a, const char *s)
 132 {
 133         struct archive_write *a = (struct archive_write *)_a;
 134         char key[64], val[64];
 135         int len, r, ret = ARCHIVE_OK;
 136
 137         __archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
 138             ARCHIVE_STATE_NEW, "archive_write_set_format_options");
 139         archive_clear_error(&a->archive);
 140
 141         if (s == NULL || *s == '\0')
 142                 return (ARCHIVE_OK);
 143         if (a->format_options == NULL)
 144                 /* This format does not support option. */
 145                 return (ARCHIVE_OK);
 146
 147         while ((len = __archive_parse_options(s, a->format_name,
 148             sizeof(key), key, sizeof(val), val)) > 0) {
 149                 if (val[0] == '\0')
 150                         r = a->format_options(a, key, NULL);
 151                 else
 152                         r = a->format_options(a, key, val);
 153                 if (r == ARCHIVE_FATAL)
 154                         return (r);
 155                 if (r < ARCHIVE_OK) { /* This key was not handled. */
 156                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
 157                             "Unsupported option ``%s''", key);
 158                         ret = ARCHIVE_WARN;
 159                 }
 160                 s += len;
 161         }
 162         if (len < 0) {
 163                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
 164                     "Malformed options string.");
 165                 return (ARCHIVE_WARN);
 166         }
 167         return (ret);
 168 }
 169
 170 /*
 171  * Set write options for the compressor. Returns 0 if successful.
 172  */
 173 int
 174 archive_write_set_compressor_options(struct archive *_a, const char *s)
 175 {
 176         struct archive_write *a = (struct archive_write *)_a;
 177         char key[64], val[64];
 178         int len, r;
 179         int ret = ARCHIVE_OK;
 180
 181         __archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
 182             ARCHIVE_STATE_NEW, "archive_write_set_compressor_options");
 183         archive_clear_error(&a->archive);
 184
 185         if (s == NULL || *s == '\0')
 186                 return (ARCHIVE_OK);
 187         if (a->compressor.options == NULL) {
 188                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
 189                     "Unsupported option ``%s''", s);
 190                 /* This compressor does not support option. */
 191                 return (ARCHIVE_WARN);
 192         }
 193
 194         while ((len = __archive_parse_options(s, a->archive.compression_name,
 195             sizeof(key), key, sizeof(val), val)) > 0) {
 196                 if (val[0] == '\0')
 197                         r = a->compressor.options(a, key, NULL);
 198                 else
 199                         r = a->compressor.options(a, key, val);
 200                 if (r == ARCHIVE_FATAL)
 201                         return (r);
 202                 if (r < ARCHIVE_OK) {
 203                         archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
 204                             "Unsupported option ``%s''", key);
 205                         ret = ARCHIVE_WARN;
 206                 }
 207                 s += len;
 208         }
 209         if (len < 0) {
 210                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
 211                     "Illegal format options.");
 212                 return (ARCHIVE_WARN);
 213         }
 214         return (ret);
 215 }
 216
 217 /*
 218  * Set write options for the format and the compressor. Returns 0 if successful.
 219  */
 220 int
 221 archive_write_set_options(struct archive *_a, const char *s)
 222 {
 223         int r1, r2;
 224
 225         r1 = archive_write_set_format_options(_a, s);
 226         if (r1 < ARCHIVE_WARN)
 227                 return (r1);
 228         r2 = archive_write_set_compressor_options(_a, s);
 229         if (r2 < ARCHIVE_WARN)
 230                 return (r2);
 231         if (r1 == ARCHIVE_WARN && r2 == ARCHIVE_WARN)
 232                 return (ARCHIVE_WARN);
 233         return (ARCHIVE_OK);
 234 }
 235
 236 /*
 237  * Set the block size.  Returns 0 if successful.
 238  */
 239 int
 240 archive_write_set_bytes_per_block(struct archive *_a, int bytes_per_block)
 241 {
 242         struct archive_write *a = (struct archive_write *)_a;
 243         __archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
 244             ARCHIVE_STATE_NEW, "archive_write_set_bytes_per_block");
 245         a->bytes_per_block = bytes_per_block;
 246         return (ARCHIVE_OK);
 247 }
 248
 249 /*
 250  * Get the current block size.  -1 if it has never been set.
 251  */
 252 int
 253 archive_write_get_bytes_per_block(struct archive *_a)
 254 {
 255         struct archive_write *a = (struct archive_write *)_a;
 256         __archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
 257             ARCHIVE_STATE_ANY, "archive_write_get_bytes_per_block");
 258         return (a->bytes_per_block);
 259 }
 260
 261 /*
 262  * Set the size for the last block.
 263  * Returns 0 if successful.
 264  */
 265 int
 266 archive_write_set_bytes_in_last_block(struct archive *_a, int bytes)
 267 {
 268         struct archive_write *a = (struct archive_write *)_a;
 269         __archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
 270             ARCHIVE_STATE_ANY, "archive_write_set_bytes_in_last_block");
 271         a->bytes_in_last_block = bytes;
 272         return (ARCHIVE_OK);
 273 }
 274
 275 /*
 276  * Return the value set above.  -1 indicates it has not been set.
 277  */
 278 int
 279 archive_write_get_bytes_in_last_block(struct archive *_a)
 280 {
 281         struct archive_write *a = (struct archive_write *)_a;
 282         __archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
 283             ARCHIVE_STATE_ANY, "archive_write_get_bytes_in_last_block");
 284         return (a->bytes_in_last_block);
 285 }
 286
 287
 288 /*
 289  * dev/ino of a file to be rejected.  Used to prevent adding
 290  * an archive to itself recursively.
 291  */
 292 int
 293 archive_write_set_skip_file(struct archive *_a, dev_t d, ino_t i)
 294 {
 295         struct archive_write *a = (struct archive_write *)_a;
 296         __archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
 297             ARCHIVE_STATE_ANY, "archive_write_set_skip_file");
 298         a->skip_file_dev = d;
 299         a->skip_file_ino = i;
 300         return (ARCHIVE_OK);
 301 }
 302
 303
 304 /*
 305  * Open the archive using the current settings.
 306  */
 307 int
 308 archive_write_open(struct archive *_a, void *client_data,
 309     archive_open_callback *opener, archive_write_callback *writer,
 310     archive_close_callback *closer)
 311 {
 312         struct archive_write *a = (struct archive_write *)_a;
 313         int ret;
 314
 315         __archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
 316             ARCHIVE_STATE_NEW, "archive_write_open");
 317         archive_clear_error(&a->archive);
 318         a->archive.state = ARCHIVE_STATE_HEADER;
 319         a->client_data = client_data;
 320         a->client_writer = writer;
 321         a->client_opener = opener;
 322         a->client_closer = closer;
 323         ret = (a->compressor.init)(a);
 324         if (a->format_init && ret == ARCHIVE_OK)
 325                 ret = (a->format_init)(a);
 326         return (ret);
 327 }
 328
 329
 330 /*
 331  * Close out the archive.
 332  *
 333  * Be careful: user might just call write_new and then write_finish.
 334  * Don't assume we actually wrote anything or performed any non-trivial
 335  * initialization.
 336  */
 337 static int
 338 _archive_write_close(struct archive *_a)
 339 {
 340         struct archive_write *a = (struct archive_write *)_a;
 341         int r = ARCHIVE_OK, r1 = ARCHIVE_OK;
 342
 343         __archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
 344             ARCHIVE_STATE_ANY, "archive_write_close");
 345
 346         /* Finish the last entry. */
 347         if (a->archive.state & ARCHIVE_STATE_DATA)
 348                 r = ((a->format_finish_entry)(a));
 349
 350         /* Finish off the archive. */
 351         if (a->format_finish != NULL) {
 352                 r1 = (a->format_finish)(a);
 353                 if (r1 < r)
 354                         r = r1;
 355         }
 356
 357         /* Release format resources. */
 358         if (a->format_destroy != NULL) {
 359                 r1 = (a->format_destroy)(a);
 360                 if (r1 < r)
 361                         r = r1;
 362         }
 363
 364         /* Finish the compression and close the stream. */
 365         if (a->compressor.finish != NULL) {
 366                 r1 = (a->compressor.finish)(a);
 367                 if (r1 < r)
 368                         r = r1;
 369         }
 370
 371         /* Close out the client stream. */
 372         if (a->client_closer != NULL) {
 373                 r1 = (a->client_closer)(&a->archive, a->client_data);
 374                 if (r1 < r)
 375                         r = r1;
 376         }
 377
 378         a->archive.state = ARCHIVE_STATE_CLOSED;
 379         return (r);
 380 }
 381
 382 /*
 383  * Destroy the archive structure.
 384  */
 385 static int
 386 _archive_write_finish(struct archive *_a)
 387 {
 388         struct archive_write *a = (struct archive_write *)_a;
 389         int r = ARCHIVE_OK;
 390
 391         __archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
 392             ARCHIVE_STATE_ANY, "archive_write_finish");
 393         if (a->archive.state != ARCHIVE_STATE_CLOSED)
 394                 r = archive_write_close(&a->archive);
 395
 396         /* Release various dynamic buffers. */
 397         free((void *)(uintptr_t)(const void *)a->nulls);
 398         archive_string_free(&a->archive.error_string);
 399         a->archive.magic = 0;
 400         free(a);
 401         return (r);
 402 }
 403
 404 /*
 405  * Write the appropriate header.
 406  */
 407 static int
 408 _archive_write_header(struct archive *_a, struct archive_entry *entry)
 409 {
 410         struct archive_write *a = (struct archive_write *)_a;
 411         int ret, r2;
 412
 413         __archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
 414             ARCHIVE_STATE_DATA | ARCHIVE_STATE_HEADER, "archive_write_header");
 415         archive_clear_error(&a->archive);
 416
 417         /* In particular, "retry" and "fatal" get returned immediately. */
 418         ret = archive_write_finish_entry(&a->archive);
 419         if (ret < ARCHIVE_OK && ret != ARCHIVE_WARN)
 420                 return (ret);
 421
 422         if (a->skip_file_dev != 0 &&
 423             archive_entry_dev(entry) == a->skip_file_dev &&
 424             a->skip_file_ino != 0 &&
 425             archive_entry_ino64(entry) == a->skip_file_ino) {
 426                 archive_set_error(&a->archive, 0,
 427                     "Can't add archive to itself");
 428                 return (ARCHIVE_FAILED);
 429         }
 430
 431         /* Format and write header. */
 432         r2 = ((a->format_write_header)(a, entry));
 433         if (r2 < ret)
 434                 ret = r2;
 435
 436         a->archive.state = ARCHIVE_STATE_DATA;
 437         return (ret);
 438 }
 439
 440 static int
 441 _archive_write_finish_entry(struct archive *_a)
 442 {
 443         struct archive_write *a = (struct archive_write *)_a;
 444         int ret = ARCHIVE_OK;
 445
 446         __archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
 447             ARCHIVE_STATE_HEADER | ARCHIVE_STATE_DATA,
 448             "archive_write_finish_entry");
 449         if (a->archive.state & ARCHIVE_STATE_DATA)
 450                 ret = (a->format_finish_entry)(a);
 451         a->archive.state = ARCHIVE_STATE_HEADER;
 452         return (ret);
 453 }
 454
 455 /*
 456  * Note that the compressor is responsible for blocking.
 457  */
 458 static ssize_t
 459 _archive_write_data(struct archive *_a, const void *buff, size_t s)
 460 {
 461         struct archive_write *a = (struct archive_write *)_a;
 462         __archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
 463             ARCHIVE_STATE_DATA, "archive_write_data");
 464         archive_clear_error(&a->archive);
 465         return ((a->format_write_data)(a, buff, s));
 466 }