df3c1316b0
Portability: Thanks to Juergen Lock, libarchive now compiles cleanly
on Linux. Along the way, I cleaned up a lot of error return codes and
reorganized some code to simplify conditional compilation of certain
sections.
Bug fixes:
* pax format now actually stores filenames that are 101-154
characters long.
* pax format now allows newline characters in extended attributes
(this fixes a long-standing bug in ACL handling)
* mtime/atime are now restored for directories
* directory list is now sorted prior to fix-up to permit
correct restore of non-writable dir heirarchies
434 lines
12 KiB
C
434 lines
12 KiB
C
/*-
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* Copyright (c) 2003-2004 Tim Kientzle
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer
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* in this position and unchanged.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "archive_platform.h"
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__FBSDID("$FreeBSD$");
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#include <sys/stat.h>
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#ifdef HAVE_DMALLOC
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#include <dmalloc.h>
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#endif
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "archive.h"
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#include "archive_entry.h"
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#include "archive_private.h"
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/* Constants are chosen so that 'term & 15' is number of termination bytes */
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#define TERM_BYTES(n) ((n) & 15)
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#define OCTAL_TERM_SPACE_NULL 0x12
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#define OCTAL_TERM_NULL_SPACE 0x22
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#define OCTAL_TERM_NULL 0x31
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#define OCTAL_TERM_SPACE 0x41
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#define OCTAL_TERM_NONE 0x50
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struct ustar {
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uint64_t entry_bytes_remaining;
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uint64_t entry_padding;
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char written;
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};
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/*
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* Define structure of POSIX 'ustar' tar header.
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*/
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struct archive_entry_header_ustar {
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char name[100];
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char mode[8];
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char uid[8];
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char gid[8];
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char size[12];
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char mtime[12];
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char checksum[8];
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char typeflag[1];
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char linkname[100];
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char magic[6]; /* For POSIX: "ustar\0" */
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char version[2]; /* For POSIX: "00" */
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char uname[32];
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char gname[32];
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char devmajor[8];
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char devminor[8];
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char prefix[155];
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};
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static int archive_write_ustar_data(struct archive *a, const void *buff,
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size_t s);
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static int archive_write_ustar_finish(struct archive *);
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static int archive_write_ustar_finish_entry(struct archive *);
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static int archive_write_ustar_header(struct archive *,
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struct archive_entry *entry);
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static int format_octal(int64_t, char *, int, int term);
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static int64_t format_octal_recursive(int64_t, char *, int);
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static int write_nulls(struct archive *a, size_t);
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/*
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* Set output format to 'ustar' format.
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*/
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int
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archive_write_set_format_ustar(struct archive *a)
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{
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struct ustar *ustar;
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/* If someone else was already registered, unregister them. */
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if (a->format_finish != NULL)
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(a->format_finish)(a);
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ustar = malloc(sizeof(*ustar));
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if (ustar == NULL) {
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archive_set_error(a, ENOMEM, "Can't allocate ustar data");
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return (ARCHIVE_FATAL);
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}
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memset(ustar, 0, sizeof(*ustar));
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a->format_data = ustar;
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a->pad_uncompressed = 1; /* Mimic gtar in this respect. */
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a->format_write_header = archive_write_ustar_header;
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a->format_write_data = archive_write_ustar_data;
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a->format_finish = archive_write_ustar_finish;
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a->format_finish_entry = archive_write_ustar_finish_entry;
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a->archive_format = ARCHIVE_FORMAT_TAR_USTAR;
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a->archive_format_name = "POSIX ustar";
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return (ARCHIVE_OK);
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}
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static int
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archive_write_ustar_header(struct archive *a, struct archive_entry *entry)
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{
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char buff[512];
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int ret;
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struct ustar *ustar;
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ustar = a->format_data;
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ustar->written = 1;
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/* Only regular files (not hardlinks) have data. */
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if (archive_entry_hardlink(entry) != NULL ||
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archive_entry_symlink(entry) != NULL ||
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!S_ISREG(archive_entry_mode(entry)))
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archive_entry_set_size(entry, 0);
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ret = __archive_write_format_header_ustar(a, buff, entry);
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if (ret != ARCHIVE_OK)
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return (ret);
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ret = (a->compression_write)(a, buff, 512);
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if (ret < 512)
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return (ARCHIVE_FATAL);
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ustar->entry_bytes_remaining = archive_entry_size(entry);
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ustar->entry_padding = 0x1ff & (- ustar->entry_bytes_remaining);
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return (ARCHIVE_OK);
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}
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/*
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* Format a basic 512-byte "ustar" header.
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*
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* Returns -1 if format failed (due to field overflow).
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* Note that this always formats as much of the header as possible.
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*
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* This is exported so that other 'tar' formats can use it.
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*/
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int
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__archive_write_format_header_ustar(struct archive *a, char buff[512],
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struct archive_entry *entry)
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{
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unsigned int checksum;
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struct archive_entry_header_ustar *h;
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int i, ret;
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const char *p, *pp;
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const struct stat *st;
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ret = 0;
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memset(buff, 0, 512);
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h = (struct archive_entry_header_ustar *)buff;
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/*
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* Because the block is already null-filled, and strings
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* are allowed to exactly fill their destination (without null),
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* I use memcpy(dest, src, strlen()) here a lot to copy strings.
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*/
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pp = archive_entry_pathname(entry);
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if (strlen(pp) <= sizeof(h->name))
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memcpy(h->name, pp, strlen(pp));
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else {
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/* Store in two pieces, splitting at a '/'. */
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p = strchr(pp + strlen(pp) - sizeof(h->name) - 1, '/');
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/*
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* If there is no path separator, or the prefix or
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* remaining name are too large, return an error.
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*/
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if (!p) {
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archive_set_error(a, ENAMETOOLONG,
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"Pathname too long");
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ret = ARCHIVE_WARN;
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} else if (p > pp + sizeof(h->prefix)) {
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archive_set_error(a, ENAMETOOLONG,
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"Pathname too long");
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ret = ARCHIVE_WARN;
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} else {
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/* Copy prefix and remainder to appropriate places */
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memcpy(h->prefix, pp, p - pp);
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memcpy(h->name, p + 1, pp + strlen(pp) - p - 1);
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}
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}
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p = archive_entry_hardlink(entry);
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if(p == NULL)
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p = archive_entry_symlink(entry);
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if (p != NULL && p[0] != '\0') {
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if (strlen(p) > sizeof(h->linkname)) {
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archive_set_error(a, ENAMETOOLONG,
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"Link contents too long");
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ret = ARCHIVE_WARN;
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} else
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memcpy(h->linkname, p, strlen(p));
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}
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p = archive_entry_uname(entry);
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if (p != NULL && p[0] != '\0') {
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if (strlen(p) > sizeof(h->uname)) {
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archive_set_error(a, ARCHIVE_ERRNO_MISC,
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"Username too long");
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ret = ARCHIVE_WARN;
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} else
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memcpy(h->uname, p, strlen(p));
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}
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p = archive_entry_gname(entry);
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if (p != NULL && p[0] != '\0') {
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if (strlen(p) > sizeof(h->gname)) {
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archive_set_error(a, ARCHIVE_ERRNO_MISC,
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"Group name too long");
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ret = ARCHIVE_WARN;
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} else
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memcpy(h->gname, p, strlen(p));
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}
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st = archive_entry_stat(entry);
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if (format_octal(st->st_mode & 07777, h->mode, sizeof(h->mode),
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OCTAL_TERM_SPACE_NULL)) {
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archive_set_error(a, ERANGE, "Numeric mode too large");
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ret = ARCHIVE_WARN;
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}
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if (format_octal(st->st_uid, h->uid, sizeof(h->uid),
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OCTAL_TERM_SPACE_NULL)) {
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archive_set_error(a, ERANGE, "Numeric user ID too large");
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ret = ARCHIVE_WARN;
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}
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if (format_octal(st->st_gid, h->gid, sizeof(h->gid),
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OCTAL_TERM_SPACE_NULL)) {
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archive_set_error(a, ERANGE, "Numeric group ID too large");
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ret = ARCHIVE_WARN;
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}
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if (format_octal(st->st_size, h->size,
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sizeof(h->size), OCTAL_TERM_SPACE)) {
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archive_set_error(a, ERANGE, "File size too large");
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ret = ARCHIVE_WARN;
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}
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if (format_octal(st->st_mtime, h->mtime,
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sizeof(h->mtime), OCTAL_TERM_SPACE)) {
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archive_set_error(a, ERANGE,
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"File modification time too large");
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ret = ARCHIVE_WARN;
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}
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if (S_ISBLK(st->st_mode) || S_ISCHR(st->st_mode)) {
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if (format_octal(major(st->st_rdev), h->devmajor,
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sizeof(h->devmajor), OCTAL_TERM_SPACE_NULL)) {
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archive_set_error(a, ERANGE,
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"Major device number too large");
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ret = ARCHIVE_WARN;
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}
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if (format_octal(minor(st->st_rdev), h->devminor,
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sizeof(h->devminor), OCTAL_TERM_SPACE_NULL)) {
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archive_set_error(a, ERANGE,
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"Minor device number too large");
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ret = ARCHIVE_WARN;
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}
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} else {
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format_octal(0, h->devmajor, sizeof(h->devmajor),
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OCTAL_TERM_SPACE_NULL);
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format_octal(0, h->devminor, sizeof(h->devminor),
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OCTAL_TERM_SPACE_NULL);
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}
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if (archive_entry_tartype(entry) >= 0) {
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h->typeflag[0] = archive_entry_tartype(entry);
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} else if (archive_entry_hardlink(entry) != NULL) {
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h->typeflag[0] = '1';
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} else {
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switch (st->st_mode & S_IFMT) {
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case S_IFREG: h->typeflag[0] = '0' ; break;
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case S_IFLNK: h->typeflag[0] = '2' ; break;
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case S_IFCHR: h->typeflag[0] = '3' ; break;
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case S_IFBLK: h->typeflag[0] = '4' ; break;
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case S_IFDIR: h->typeflag[0] = '5' ; break;
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case S_IFIFO: h->typeflag[0] = '6' ; break;
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case S_IFSOCK:
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archive_set_error(a, ARCHIVE_ERRNO_FILE_FORMAT,
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"tar format cannot archive socket");
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ret = ARCHIVE_WARN;
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break;
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default:
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archive_set_error(a, ARCHIVE_ERRNO_FILE_FORMAT,
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"tar format cannot archive this");
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ret = ARCHIVE_WARN;
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}
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}
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memcpy(h->magic, "ustar\0", 6);
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memcpy(h->version, "00", 2);
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memcpy(h->checksum, " ", 8);
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checksum = 0;
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for (i = 0; i < 512; i++)
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checksum += 255 & (unsigned int)buff[i];
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if (format_octal(checksum, h->checksum,
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sizeof(h->checksum), OCTAL_TERM_NULL_SPACE)) {
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archive_set_error(a, ERANGE,
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"Checksum too large (Internal error; this can't happen)");
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ret = ARCHIVE_WARN;
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}
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return (ret);
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}
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/*
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* Format a number into the specified field.
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*/
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static int
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format_octal(int64_t v, char *p, int s, int term)
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{
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/* POSIX specifies that all numeric values are unsigned. */
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int64_t max;
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int digits, ret;
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digits = s - TERM_BYTES(term);
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max = (((int64_t)1) << (digits * 3)) - 1;
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if (v >= 0 && v <= max) {
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format_octal_recursive(v, p, digits);
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ret = 0;
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} else {
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format_octal_recursive(max, p, digits);
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ret = -1;
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}
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switch (term) {
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case OCTAL_TERM_SPACE_NULL:
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p[s-2] = 0x20;
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/* fall through */
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case OCTAL_TERM_NULL:
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p[s-1] = 0;
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break;
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case OCTAL_TERM_NULL_SPACE:
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p[s-2] = 0;
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/* fall through */
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case OCTAL_TERM_SPACE:
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p[s-1] = 0x20;
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break;
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}
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return (ret);
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}
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static int64_t
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format_octal_recursive(int64_t v, char *p, int s)
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{
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if (s == 0)
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return (v);
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v = format_octal_recursive(v, p+1, s-1);
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*p = '0' + (v & 7);
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return (v >>= 3);
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}
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static int
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archive_write_ustar_finish(struct archive *a)
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{
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struct ustar *ustar;
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ustar = a->format_data;
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/*
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* Suppress end-of-archive if nothing else was ever written.
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* This fixes a problem where setting one format, then another ends up
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* attempting to write a gratuitous end-of-archive marker.
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*/
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if (ustar->written && a->compression_write != NULL)
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if (write_nulls(a, 512*2) < 512*2)
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return (ARCHIVE_FATAL);
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free(a->format_data);
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a->format_data = NULL;
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return (ARCHIVE_OK);
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}
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static int
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archive_write_ustar_finish_entry(struct archive *a)
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{
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struct ustar *ustar;
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int ret;
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ustar = a->format_data;
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ret = write_nulls(a,
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ustar->entry_bytes_remaining + ustar->entry_padding);
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ustar->entry_bytes_remaining = ustar->entry_padding = 0;
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return (ret);
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}
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static int
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write_nulls(struct archive *a, size_t padding)
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{
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int ret, to_write;
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while (padding > 0) {
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to_write = padding < a->null_length ? padding : a->null_length;
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ret = (a->compression_write)(a, a->nulls, to_write);
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if (ret < to_write) return (-1);
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padding -= to_write;
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}
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return (0);
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}
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static int
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archive_write_ustar_data(struct archive *a, const void *buff, size_t s)
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{
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struct ustar *ustar;
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int ret;
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ustar = a->format_data;
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if (s > ustar->entry_bytes_remaining)
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s = ustar->entry_bytes_remaining;
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ret = (a->compression_write)(a, buff, s);
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ustar->entry_bytes_remaining -= s;
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return (ret);
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}
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