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ghcup-hs/3rdparty/libarchive/c/archive_write_disk_windows.c

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Use libarchive instead of tar-bytestring
2020-07-04 21:33:48 +00:00
/*-
* Copyright (c) 2003-2010 Tim Kientzle
* Copyright (c) 2011-2012 Michihiro NAKAJIMA
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer
* in this position and unchanged.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "archive_platform.h"
__FBSDID("$FreeBSD$");
#if defined(_WIN32) && !defined(__CYGWIN__)
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_UTIME_H
#include <sys/utime.h>
#endif
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifdef HAVE_LIMITS_H
#include <limits.h>
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#include <winioctl.h>
/* TODO: Support Mac OS 'quarantine' feature. This is really just a
* standard tag to mark files that have been downloaded as "tainted".
* On Mac OS, we should mark the extracted files as tainted if the
* archive being read was tainted. Windows has a similar feature; we
* should investigate ways to support this generically. */
#include "archive.h"
#include "archive_acl_private.h"
#include "archive_string.h"
#include "archive_entry.h"
#include "archive_private.h"
#ifndef O_BINARY
#define O_BINARY 0
#endif
#ifndef IO_REPARSE_TAG_SYMLINK
/* Old SDKs do not provide IO_REPARSE_TAG_SYMLINK */
#define IO_REPARSE_TAG_SYMLINK 0xA000000CL
#endif
static BOOL SetFilePointerEx_perso(HANDLE hFile,
LARGE_INTEGER liDistanceToMove,
PLARGE_INTEGER lpNewFilePointer,
DWORD dwMoveMethod)
{
LARGE_INTEGER li;
li.QuadPart = liDistanceToMove.QuadPart;
li.LowPart = SetFilePointer(
hFile, li.LowPart, &li.HighPart, dwMoveMethod);
if(lpNewFilePointer) {
lpNewFilePointer->QuadPart = li.QuadPart;
}
return li.LowPart != (DWORD)-1 || GetLastError() == NO_ERROR;
}
struct fixup_entry {
struct fixup_entry *next;
struct archive_acl acl;
mode_t mode;
int64_t atime;
int64_t birthtime;
int64_t mtime;
int64_t ctime;
unsigned long atime_nanos;
unsigned long birthtime_nanos;
unsigned long mtime_nanos;
unsigned long ctime_nanos;
unsigned long fflags_set;
int fixup; /* bitmask of what needs fixing */
wchar_t *name;
};
/*
* We use a bitmask to track which operations remain to be done for
* this file. In particular, this helps us avoid unnecessary
* operations when it's possible to take care of one step as a
* side-effect of another. For example, mkdir() can specify the mode
* for the newly-created object but symlink() cannot. This means we
* can skip chmod() if mkdir() succeeded, but we must explicitly
* chmod() if we're trying to create a directory that already exists
* (mkdir() failed) or if we're restoring a symlink. Similarly, we
* need to verify UID/GID before trying to restore SUID/SGID bits;
* that verification can occur explicitly through a stat() call or
* implicitly because of a successful chown() call.
*/
#define TODO_MODE_FORCE 0x40000000
#define TODO_MODE_BASE 0x20000000
#define TODO_SUID 0x10000000
#define TODO_SUID_CHECK 0x08000000
#define TODO_SGID 0x04000000
#define TODO_SGID_CHECK 0x02000000
#define TODO_MODE (TODO_MODE_BASE|TODO_SUID|TODO_SGID)
#define TODO_TIMES ARCHIVE_EXTRACT_TIME
#define TODO_OWNER ARCHIVE_EXTRACT_OWNER
#define TODO_FFLAGS ARCHIVE_EXTRACT_FFLAGS
#define TODO_ACLS ARCHIVE_EXTRACT_ACL
#define TODO_XATTR ARCHIVE_EXTRACT_XATTR
#define TODO_MAC_METADATA ARCHIVE_EXTRACT_MAC_METADATA
struct archive_write_disk {
struct archive archive;
mode_t user_umask;
struct fixup_entry *fixup_list;
struct fixup_entry *current_fixup;
int64_t user_uid;
int skip_file_set;
int64_t skip_file_dev;
int64_t skip_file_ino;
time_t start_time;
int64_t (*lookup_gid)(void *private, const char *gname, int64_t gid);
void (*cleanup_gid)(void *private);
void *lookup_gid_data;
int64_t (*lookup_uid)(void *private, const char *uname, int64_t uid);
void (*cleanup_uid)(void *private);
void *lookup_uid_data;
/*
* Full path of last file to satisfy symlink checks.
*/
struct archive_wstring path_safe;
/*
* Cached stat data from disk for the current entry.
* If this is valid, pst points to st. Otherwise,
* pst is null.
*/
BY_HANDLE_FILE_INFORMATION st;
BY_HANDLE_FILE_INFORMATION *pst;
/* Information about the object being restored right now. */
struct archive_entry *entry; /* Entry being extracted. */
wchar_t *name; /* Name of entry, possibly edited. */
struct archive_wstring _name_data; /* backing store for 'name' */
wchar_t *tmpname; /* Temporary name */
struct archive_wstring _tmpname_data; /* backing store for 'tmpname' */
/* Tasks remaining for this object. */
int todo;
/* Tasks deferred until end-of-archive. */
int deferred;
/* Options requested by the client. */
int flags;
/* Handle for the file we're restoring. */
HANDLE fh;
/* Current offset for writing data to the file. */
int64_t offset;
/* Last offset actually written to disk. */
int64_t fd_offset;
/* Total bytes actually written to files. */
int64_t total_bytes_written;
/* Maximum size of file, -1 if unknown. */
int64_t filesize;
/* Dir we were in before this restore; only for deep paths. */
int restore_pwd;
/* Mode we should use for this entry; affected by _PERM and umask. */
mode_t mode;
/* UID/GID to use in restoring this entry. */
int64_t uid;
int64_t gid;
};
/*
* Default mode for dirs created automatically (will be modified by umask).
* Note that POSIX specifies 0777 for implicitly-created dirs, "modified
* by the process' file creation mask."
*/
#define DEFAULT_DIR_MODE 0777
/*
* Dir modes are restored in two steps: During the extraction, the permissions
* in the archive are modified to match the following limits. During
* the post-extract fixup pass, the permissions from the archive are
* applied.
*/
#define MINIMUM_DIR_MODE 0700
#define MAXIMUM_DIR_MODE 0775
static int disk_unlink(const wchar_t *);
static int disk_rmdir(const wchar_t *);
static int check_symlinks(struct archive_write_disk *);
static int create_filesystem_object(struct archive_write_disk *);
static struct fixup_entry *current_fixup(struct archive_write_disk *,
const wchar_t *pathname);
static int cleanup_pathname(struct archive_write_disk *);
static int create_dir(struct archive_write_disk *, wchar_t *);
static int create_parent_dir(struct archive_write_disk *, wchar_t *);
static int la_chmod(const wchar_t *, mode_t);
static int la_mktemp(struct archive_write_disk *);
static int older(BY_HANDLE_FILE_INFORMATION *, struct archive_entry *);
static int permissive_name_w(struct archive_write_disk *);
static int restore_entry(struct archive_write_disk *);
static int set_acls(struct archive_write_disk *, HANDLE h,
const wchar_t *, struct archive_acl *);
static int set_xattrs(struct archive_write_disk *);
static int clear_nochange_fflags(struct archive_write_disk *);
static int set_fflags(struct archive_write_disk *);
static int set_fflags_platform(const wchar_t *, unsigned long,
unsigned long);
static int set_ownership(struct archive_write_disk *);
static int set_mode(struct archive_write_disk *, int mode);
static int set_times(struct archive_write_disk *, HANDLE, int,
const wchar_t *, time_t, long, time_t, long, time_t,
long, time_t, long);
static int set_times_from_entry(struct archive_write_disk *);
static struct fixup_entry *sort_dir_list(struct fixup_entry *p);
static ssize_t write_data_block(struct archive_write_disk *,
const char *, size_t);
static struct archive_vtable *archive_write_disk_vtable(void);
static int _archive_write_disk_close(struct archive *);
static int _archive_write_disk_free(struct archive *);
static int _archive_write_disk_header(struct archive *,
struct archive_entry *);
static int64_t _archive_write_disk_filter_bytes(struct archive *, int);
static int _archive_write_disk_finish_entry(struct archive *);
static ssize_t _archive_write_disk_data(struct archive *, const void *,
size_t);
static ssize_t _archive_write_disk_data_block(struct archive *, const void *,
size_t, int64_t);
#define bhfi_dev(bhfi) ((bhfi)->dwVolumeSerialNumber)
/* Treat FileIndex as i-node. We should remove a sequence number
* which is high-16-bits of nFileIndexHigh. */
#define bhfi_ino(bhfi) \
((((int64_t)((bhfi)->nFileIndexHigh & 0x0000FFFFUL)) << 32) \
+ (bhfi)->nFileIndexLow)
#define bhfi_size(bhfi) \
((((int64_t)(bhfi)->nFileSizeHigh) << 32) + (bhfi)->nFileSizeLow)
static int
file_information(struct archive_write_disk *a, wchar_t *path,
BY_HANDLE_FILE_INFORMATION *st, mode_t *mode, int sim_lstat)
{
HANDLE h;
int r;
DWORD flag = FILE_FLAG_BACKUP_SEMANTICS;
WIN32_FIND_DATAW findData;
if (sim_lstat || mode != NULL) {
h = FindFirstFileW(path, &findData);
if (h == INVALID_HANDLE_VALUE &&
GetLastError() == ERROR_INVALID_NAME) {
wchar_t *full;
full = __la_win_permissive_name_w(path);
h = FindFirstFileW(full, &findData);
free(full);
}
if (h == INVALID_HANDLE_VALUE) {
la_dosmaperr(GetLastError());
return (-1);
}
FindClose(h);
}
/* Is symlink file ? */
if (sim_lstat &&
((findData.dwFileAttributes
& FILE_ATTRIBUTE_REPARSE_POINT) &&
(findData.dwReserved0 == IO_REPARSE_TAG_SYMLINK)))
flag |= FILE_FLAG_OPEN_REPARSE_POINT;
h = CreateFileW(a->name, 0, 0, NULL,
OPEN_EXISTING, flag, NULL);
if (h == INVALID_HANDLE_VALUE &&
GetLastError() == ERROR_INVALID_NAME) {
wchar_t *full;
full = __la_win_permissive_name_w(path);
h = CreateFileW(full, 0, 0, NULL,
OPEN_EXISTING, flag, NULL);
free(full);
}
if (h == INVALID_HANDLE_VALUE) {
la_dosmaperr(GetLastError());
return (-1);
}
r = GetFileInformationByHandle(h, st);
CloseHandle(h);
if (r == 0) {
la_dosmaperr(GetLastError());
return (-1);
}
if (mode == NULL)
return (0);
*mode = S_IRUSR | S_IRGRP | S_IROTH;
if ((st->dwFileAttributes & FILE_ATTRIBUTE_READONLY) == 0)
*mode |= S_IWUSR | S_IWGRP | S_IWOTH;
if ((st->dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
findData.dwReserved0 == IO_REPARSE_TAG_SYMLINK)
*mode |= S_IFLNK;
else if (st->dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
*mode |= S_IFDIR | S_IXUSR | S_IXGRP | S_IXOTH;
else {
const wchar_t *p;
*mode |= S_IFREG;
p = wcsrchr(path, L'.');
if (p != NULL && wcslen(p) == 4) {
switch (p[1]) {
case L'B': case L'b':
if ((p[2] == L'A' || p[2] == L'a' ) &&
(p[3] == L'T' || p[3] == L't' ))
*mode |= S_IXUSR | S_IXGRP | S_IXOTH;
break;
case L'C': case L'c':
if (((p[2] == L'M' || p[2] == L'm' ) &&
(p[3] == L'D' || p[3] == L'd' )))
*mode |= S_IXUSR | S_IXGRP | S_IXOTH;
break;
case L'E': case L'e':
if ((p[2] == L'X' || p[2] == L'x' ) &&
(p[3] == L'E' || p[3] == L'e' ))
*mode |= S_IXUSR | S_IXGRP | S_IXOTH;
break;
default:
break;
}
}
}
return (0);
}
/*
* Note: The path, for example, "aa/a/../b../c" will be converted to "aa/c"
* by GetFullPathNameW() W32 API, which __la_win_permissive_name_w uses.
* It means we cannot handle multiple dirs in one archive_entry.
* So we have to make the full-pathname in another way, which does not
* break "../" path string.
*/
static int
permissive_name_w(struct archive_write_disk *a)
{
wchar_t *wn, *wnp;
wchar_t *ws, *wsp;
DWORD l;
wnp = a->name;
if (wnp[0] == L'\\' && wnp[1] == L'\\' &&
wnp[2] == L'?' && wnp[3] == L'\\')
/* We have already a permissive name. */
return (0);
if (wnp[0] == L'\\' && wnp[1] == L'\\' &&
wnp[2] == L'.' && wnp[3] == L'\\') {
/* This is a device name */
if (((wnp[4] >= L'a' && wnp[4] <= L'z') ||
(wnp[4] >= L'A' && wnp[4] <= L'Z')) &&
wnp[5] == L':' && wnp[6] == L'\\') {
wnp[2] = L'?';/* Not device name. */
return (0);
}
}
/*
* A full-pathname starting with a drive name like "C:\abc".
*/
if (((wnp[0] >= L'a' && wnp[0] <= L'z') ||
(wnp[0] >= L'A' && wnp[0] <= L'Z')) &&
wnp[1] == L':' && wnp[2] == L'\\') {
wn = _wcsdup(wnp);
if (wn == NULL)
return (-1);
archive_wstring_ensure(&(a->_name_data), 4 + wcslen(wn) + 1);
a->name = a->_name_data.s;
/* Prepend "\\?\" */
archive_wstrncpy(&(a->_name_data), L"\\\\?\\", 4);
archive_wstrcat(&(a->_name_data), wn);
free(wn);
return (0);
}
/*
* A full-pathname pointing to a network drive
* like "\\<server-name>\<share-name>\file".
*/
if (wnp[0] == L'\\' && wnp[1] == L'\\' && wnp[2] != L'\\') {
const wchar_t *p = &wnp[2];
/* Skip server-name letters. */
while (*p != L'\\' && *p != L'\0')
++p;
if (*p == L'\\') {
const wchar_t *rp = ++p;
/* Skip share-name letters. */
while (*p != L'\\' && *p != L'\0')
++p;
if (*p == L'\\' && p != rp) {
/* Now, match patterns such as
* "\\server-name\share-name\" */
wn = _wcsdup(wnp);
if (wn == NULL)
return (-1);
archive_wstring_ensure(&(a->_name_data),
8 + wcslen(wn) + 1);
a->name = a->_name_data.s;
/* Prepend "\\?\UNC\" */
archive_wstrncpy(&(a->_name_data),
L"\\\\?\\UNC\\", 8);
archive_wstrcat(&(a->_name_data), wn+2);
free(wn);
return (0);
}
}
return (0);
}
/*
* Get current working directory.
*/
l = GetCurrentDirectoryW(0, NULL);
if (l == 0)
return (-1);
ws = malloc(l * sizeof(wchar_t));
l = GetCurrentDirectoryW(l, ws);
if (l == 0) {
free(ws);
return (-1);
}
wsp = ws;
/*
* A full-pathname starting without a drive name like "\abc".
*/
if (wnp[0] == L'\\') {
wn = _wcsdup(wnp);
if (wn == NULL)
return (-1);
archive_wstring_ensure(&(a->_name_data),
4 + 2 + wcslen(wn) + 1);
a->name = a->_name_data.s;
/* Prepend "\\?\" and drive name. */
archive_wstrncpy(&(a->_name_data), L"\\\\?\\", 4);
archive_wstrncat(&(a->_name_data), wsp, 2);
archive_wstrcat(&(a->_name_data), wn);
free(wsp);
free(wn);
return (0);
}
wn = _wcsdup(wnp);
if (wn == NULL)
return (-1);
archive_wstring_ensure(&(a->_name_data), 4 + l + 1 + wcslen(wn) + 1);
a->name = a->_name_data.s;
/* Prepend "\\?\" and drive name if not already added. */
if (l > 3 && wsp[0] == L'\\' && wsp[1] == L'\\' &&
wsp[2] == L'?' && wsp[3] == L'\\')
{
archive_wstrncpy(&(a->_name_data), wsp, l);
}
else if (l > 2 && wsp[0] == L'\\' && wsp[1] == L'\\' && wsp[2] != L'\\')
{
archive_wstrncpy(&(a->_name_data), L"\\\\?\\UNC\\", 8);
archive_wstrncat(&(a->_name_data), wsp+2, l-2);
}
else
{
archive_wstrncpy(&(a->_name_data), L"\\\\?\\", 4);
archive_wstrncat(&(a->_name_data), wsp, l);
}
archive_wstrncat(&(a->_name_data), L"\\", 1);
archive_wstrcat(&(a->_name_data), wn);
a->name = a->_name_data.s;
free(wsp);
free(wn);
return (0);
}
static int
la_chmod(const wchar_t *path, mode_t mode)
{
DWORD attr;
BOOL r;
wchar_t *fullname;
int ret = 0;
fullname = NULL;
attr = GetFileAttributesW(path);
if (attr == (DWORD)-1 &&
GetLastError() == ERROR_INVALID_NAME) {
fullname = __la_win_permissive_name_w(path);
attr = GetFileAttributesW(fullname);
}
if (attr == (DWORD)-1) {
la_dosmaperr(GetLastError());
ret = -1;
goto exit_chmode;
}
if (mode & _S_IWRITE)
attr &= ~FILE_ATTRIBUTE_READONLY;
else
attr |= FILE_ATTRIBUTE_READONLY;
if (fullname != NULL)
r = SetFileAttributesW(fullname, attr);
else
r = SetFileAttributesW(path, attr);
if (r == 0) {
la_dosmaperr(GetLastError());
ret = -1;
}
exit_chmode:
free(fullname);
return (ret);
}
static int
la_mktemp(struct archive_write_disk *a)
{
int fd;
mode_t mode;
archive_wstring_empty(&(a->_tmpname_data));
archive_wstrcpy(&(a->_tmpname_data), a->name);
archive_wstrcat(&(a->_tmpname_data), L".XXXXXX");
a->tmpname = a->_tmpname_data.s;
fd = __archive_mkstemp(a->tmpname);
if (fd == -1)
return -1;
mode = a->mode & 0777 & ~a->user_umask;
if (la_chmod(a->tmpname, mode) == -1) {
la_dosmaperr(GetLastError());
_close(fd);
return -1;
}
return (fd);
}
static void *
la_GetFunctionKernel32(const char *name)
{
static HINSTANCE lib;
static int set;
if (!set) {
set = 1;
lib = LoadLibrary(TEXT("kernel32.dll"));
}
if (lib == NULL) {
fprintf(stderr, "Can't load kernel32.dll?!\n");
exit(1);
}
return (void *)GetProcAddress(lib, name);
}
static int
la_CreateHardLinkW(wchar_t *linkname, wchar_t *target)
{
static BOOLEAN (WINAPI *f)(LPWSTR, LPWSTR, LPSECURITY_ATTRIBUTES);
static int set;
BOOL ret;
if (!set) {
set = 1;
f = la_GetFunctionKernel32("CreateHardLinkW");
}
if (!f) {
errno = ENOTSUP;
return (0);
}
ret = (*f)(linkname, target, NULL);
if (!ret) {
/* Under windows 2000, it is necessary to remove
* the "\\?\" prefix. */
#define IS_UNC(name) ((name[0] == L'U' || name[0] == L'u') && \
(name[1] == L'N' || name[1] == L'n') && \
(name[2] == L'C' || name[2] == L'c') && \
name[3] == L'\\')
if (!wcsncmp(linkname,L"\\\\?\\", 4)) {
linkname += 4;
if (IS_UNC(linkname))
linkname += 4;
}
if (!wcsncmp(target,L"\\\\?\\", 4)) {
target += 4;
if (IS_UNC(target))
target += 4;
}
#undef IS_UNC
ret = (*f)(linkname, target, NULL);
}
return (ret);
}
/*
* Create file or directory symolic link
*
* If linktype is AE_SYMLINK_TYPE_UNDEFINED (or unknown), guess linktype from
* the link target
*/
static int
la_CreateSymbolicLinkW(const wchar_t *linkname, const wchar_t *target,
int linktype) {
static BOOLEAN (WINAPI *f)(LPCWSTR, LPCWSTR, DWORD);
static int set;
wchar_t *ttarget, *p;
int len;
DWORD attrs = 0;
DWORD flags = 0;
DWORD newflags = 0;
BOOL ret = 0;
if (!set) {
set = 1;
f = la_GetFunctionKernel32("CreateSymbolicLinkW");
}
if (!f)
return (0);
len = wcslen(target);
if (len == 0) {
errno = EINVAL;
return(0);
}
/*
* When writing path targets, we need to translate slashes
* to backslashes
*/
ttarget = malloc((len + 1) * sizeof(wchar_t));
if (ttarget == NULL)
return(0);
p = ttarget;
while(*target != L'\0') {
if (*target == L'/')
*p = L'\\';
else
*p = *target;
target++;
p++;
}
*p = L'\0';
/*
* In case of undefined symlink type we guess it from the target.
* If the target equals ".", "..", ends with a backslash or a
* backslash followed by "." or ".." we assume it is a directory
* symlink. In all other cases we assume a file symlink.
*/
if (linktype != AE_SYMLINK_TYPE_FILE && (
linktype == AE_SYMLINK_TYPE_DIRECTORY ||
*(p - 1) == L'\\' || (*(p - 1) == L'.' && (
len == 1 || *(p - 2) == L'\\' || ( *(p - 2) == L'.' && (
len == 2 || *(p - 3) == L'\\')))))) {
#if defined(SYMBOLIC_LINK_FLAG_DIRECTORY)
flags |= SYMBOLIC_LINK_FLAG_DIRECTORY;
#else
flags |= 0x1;
#endif
}
#if defined(SYMBOLIC_LINK_FLAG_ALLOW_UNPRIVILEGED_CREATE)
newflags = flags | SYMBOLIC_LINK_FLAG_ALLOW_UNPRIVILEGED_CREATE;
#else
newflags = flags | 0x2;
#endif
/*
* Windows won't overwrite existing links
*/
attrs = GetFileAttributesW(linkname);
if (attrs != INVALID_FILE_ATTRIBUTES) {
if (attrs & FILE_ATTRIBUTE_DIRECTORY)
disk_rmdir(linkname);
else
disk_unlink(linkname);
}
ret = (*f)(linkname, ttarget, newflags);
/*
* Prior to Windows 10 calling CreateSymbolicLinkW() will fail
* if SYMBOLIC_LINK_FLAG_ALLOW_UNPRIVILEGED_CREATE is set
*/
if (!ret) {
ret = (*f)(linkname, ttarget, flags);
}
free(ttarget);
return (ret);
}
static int
la_ftruncate(HANDLE handle, int64_t length)
{
LARGE_INTEGER distance;
if (GetFileType(handle) != FILE_TYPE_DISK) {
errno = EBADF;
return (-1);
}
distance.QuadPart = length;
if (!SetFilePointerEx_perso(handle, distance, NULL, FILE_BEGIN)) {
la_dosmaperr(GetLastError());
return (-1);
}
if (!SetEndOfFile(handle)) {
la_dosmaperr(GetLastError());
return (-1);
}
return (0);
}
static int
lazy_stat(struct archive_write_disk *a)
{
if (a->pst != NULL) {
/* Already have stat() data available. */
return (ARCHIVE_OK);
}
if (a->fh != INVALID_HANDLE_VALUE &&
GetFileInformationByHandle(a->fh, &a->st) == 0) {
a->pst = &a->st;
return (ARCHIVE_OK);
}
/*
* XXX At this point, symlinks should not be hit, otherwise
* XXX a race occurred. Do we want to check explicitly for that?
*/
if (file_information(a, a->name, &a->st, NULL, 1) == 0) {
a->pst = &a->st;
return (ARCHIVE_OK);
}
archive_set_error(&a->archive, errno, "Couldn't stat file");
return (ARCHIVE_WARN);
}
static struct archive_vtable *
archive_write_disk_vtable(void)
{
static struct archive_vtable av;
static int inited = 0;
if (!inited) {
av.archive_close = _archive_write_disk_close;
av.archive_filter_bytes = _archive_write_disk_filter_bytes;
av.archive_free = _archive_write_disk_free;
av.archive_write_header = _archive_write_disk_header;
av.archive_write_finish_entry
= _archive_write_disk_finish_entry;
av.archive_write_data = _archive_write_disk_data;
av.archive_write_data_block = _archive_write_disk_data_block;
inited = 1;
}
return (&av);
}
static int64_t
_archive_write_disk_filter_bytes(struct archive *_a, int n)
{
struct archive_write_disk *a = (struct archive_write_disk *)_a;
(void)n; /* UNUSED */
if (n == -1 || n == 0)
return (a->total_bytes_written);
return (-1);
}
int
archive_write_disk_set_options(struct archive *_a, int flags)
{
struct archive_write_disk *a = (struct archive_write_disk *)_a;
a->flags = flags;
return (ARCHIVE_OK);
}
/*
* Extract this entry to disk.
*
* TODO: Validate hardlinks. According to the standards, we're
* supposed to check each extracted hardlink and squawk if it refers
* to a file that we didn't restore. I'm not entirely convinced this
* is a good idea, but more importantly: Is there any way to validate
* hardlinks without keeping a complete list of filenames from the
* entire archive?? Ugh.
*
*/
static int
_archive_write_disk_header(struct archive *_a, struct archive_entry *entry)
{
struct archive_write_disk *a = (struct archive_write_disk *)_a;
struct fixup_entry *fe;
int ret, r;
archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC,
ARCHIVE_STATE_HEADER | ARCHIVE_STATE_DATA,
"archive_write_disk_header");
archive_clear_error(&a->archive);
if (a->archive.state & ARCHIVE_STATE_DATA) {
r = _archive_write_disk_finish_entry(&a->archive);
if (r == ARCHIVE_FATAL)
return (r);
}
/* Set up for this particular entry. */
a->pst = NULL;
a->current_fixup = NULL;
a->deferred = 0;
archive_entry_free(a->entry);
a->entry = NULL;
a->entry = archive_entry_clone(entry);
a->fh = INVALID_HANDLE_VALUE;
a->fd_offset = 0;
a->offset = 0;
a->restore_pwd = -1;
a->uid = a->user_uid;
a->mode = archive_entry_mode(a->entry);
if (archive_entry_size_is_set(a->entry))
a->filesize = archive_entry_size(a->entry);
else
a->filesize = -1;
archive_wstrcpy(&(a->_name_data), archive_entry_pathname_w(a->entry));
a->name = a->_name_data.s;
archive_clear_error(&a->archive);
/*
* Clean up the requested path. This is necessary for correct
* dir restores; the dir restore logic otherwise gets messed
* up by nonsense like "dir/.".
*/
ret = cleanup_pathname(a);
if (ret != ARCHIVE_OK)
return (ret);
/*
* Generate a full-pathname and use it from here.
*/
if (permissive_name_w(a) < 0) {
errno = EINVAL;
return (ARCHIVE_FAILED);
}
/*
* Query the umask so we get predictable mode settings.
* This gets done on every call to _write_header in case the
* user edits their umask during the extraction for some
* reason.
*/
umask(a->user_umask = umask(0));
/* Figure out what we need to do for this entry. */
a->todo = TODO_MODE_BASE;
if (a->flags & ARCHIVE_EXTRACT_PERM) {
a->todo |= TODO_MODE_FORCE; /* Be pushy about permissions. */
/*
* SGID requires an extra "check" step because we
* cannot easily predict the GID that the system will
* assign. (Different systems assign GIDs to files
* based on a variety of criteria, including process
* credentials and the gid of the enclosing
* directory.) We can only restore the SGID bit if
* the file has the right GID, and we only know the
* GID if we either set it (see set_ownership) or if
* we've actually called stat() on the file after it
* was restored. Since there are several places at
* which we might verify the GID, we need a TODO bit
* to keep track.
*/
if (a->mode & S_ISGID)
a->todo |= TODO_SGID | TODO_SGID_CHECK;
/*
* Verifying the SUID is simpler, but can still be
* done in multiple ways, hence the separate "check" bit.
*/
if (a->mode & S_ISUID)
a->todo |= TODO_SUID | TODO_SUID_CHECK;
} else {
/*
* User didn't request full permissions, so don't
* restore SUID, SGID bits and obey umask.
*/
a->mode &= ~S_ISUID;
a->mode &= ~S_ISGID;
a->mode &= ~S_ISVTX;
a->mode &= ~a->user_umask;
}
#if 0
if (a->flags & ARCHIVE_EXTRACT_OWNER)
a->todo |= TODO_OWNER;
#endif
if (a->flags & ARCHIVE_EXTRACT_TIME)
a->todo |= TODO_TIMES;
if (a->flags & ARCHIVE_EXTRACT_ACL) {
if (archive_entry_filetype(a->entry) == AE_IFDIR)
a->deferred |= TODO_ACLS;
else
a->todo |= TODO_ACLS;
}
if (a->flags & ARCHIVE_EXTRACT_XATTR)
a->todo |= TODO_XATTR;
if (a->flags & ARCHIVE_EXTRACT_FFLAGS)
a->todo |= TODO_FFLAGS;
if (a->flags & ARCHIVE_EXTRACT_SECURE_SYMLINKS) {
ret = check_symlinks(a);
if (ret != ARCHIVE_OK)
return (ret);
}
ret = restore_entry(a);
/*
* TODO: There are rumours that some extended attributes must
* be restored before file data is written. If this is true,
* then we either need to write all extended attributes both
* before and after restoring the data, or find some rule for
* determining which must go first and which last. Due to the
* many ways people are using xattrs, this may prove to be an
* intractable problem.
*/
/*
* Fixup uses the unedited pathname from archive_entry_pathname(),
* because it is relative to the base dir and the edited path
* might be relative to some intermediate dir as a result of the
* deep restore logic.
*/
if (a->deferred & TODO_MODE) {
fe = current_fixup(a, archive_entry_pathname_w(entry));
fe->fixup |= TODO_MODE_BASE;
fe->mode = a->mode;
}
if ((a->deferred & TODO_TIMES)
&& (archive_entry_mtime_is_set(entry)
|| archive_entry_atime_is_set(entry))) {
fe = current_fixup(a, archive_entry_pathname_w(entry));
fe->mode = a->mode;
fe->fixup |= TODO_TIMES;
if (archive_entry_atime_is_set(entry)) {
fe->atime = archive_entry_atime(entry);
fe->atime_nanos = archive_entry_atime_nsec(entry);
} else {
/* If atime is unset, use start time. */
fe->atime = a->start_time;
fe->atime_nanos = 0;
}
if (archive_entry_mtime_is_set(entry)) {
fe->mtime = archive_entry_mtime(entry);
fe->mtime_nanos = archive_entry_mtime_nsec(entry);
} else {
/* If mtime is unset, use start time. */
fe->mtime = a->start_time;
fe->mtime_nanos = 0;
}
if (archive_entry_birthtime_is_set(entry)) {
fe->birthtime = archive_entry_birthtime(entry);
fe->birthtime_nanos = archive_entry_birthtime_nsec(entry);
} else {
/* If birthtime is unset, use mtime. */
fe->birthtime = fe->mtime;
fe->birthtime_nanos = fe->mtime_nanos;
}
}
if (a->deferred & TODO_ACLS) {
fe = current_fixup(a, archive_entry_pathname_w(entry));
archive_acl_copy(&fe->acl, archive_entry_acl(entry));
}
if (a->deferred & TODO_FFLAGS) {
unsigned long set, clear;
fe = current_fixup(a, archive_entry_pathname_w(entry));
archive_entry_fflags(entry, &set, &clear);
fe->fflags_set = set;
}
/*
* On Windows, A creating sparse file requires a special mark.
*/
if (a->fh != INVALID_HANDLE_VALUE &&
archive_entry_sparse_count(entry) > 0) {
int64_t base = 0, offset, length;
int i, cnt = archive_entry_sparse_reset(entry);
int sparse = 0;
for (i = 0; i < cnt; i++) {
archive_entry_sparse_next(entry, &offset, &length);
if (offset - base >= 4096) {
sparse = 1;/* we have a hole. */
break;
}
base = offset + length;
}
if (sparse) {
DWORD dmy;
/* Mark this file as sparse. */
DeviceIoControl(a->fh, FSCTL_SET_SPARSE,
NULL, 0, NULL, 0, &dmy, NULL);
}
}
/* We've created the object and are ready to pour data into it. */
if (ret >= ARCHIVE_WARN)
a->archive.state = ARCHIVE_STATE_DATA;
/*
* If it's not open, tell our client not to try writing.
* In particular, dirs, links, etc, don't get written to.
*/
if (a->fh == INVALID_HANDLE_VALUE) {
archive_entry_set_size(entry, 0);
a->filesize = 0;
}
return (ret);
}
int
archive_write_disk_set_skip_file(struct archive *_a, la_int64_t d, la_int64_t i)
{
struct archive_write_disk *a = (struct archive_write_disk *)_a;
archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC,
ARCHIVE_STATE_ANY, "archive_write_disk_set_skip_file");
a->skip_file_set = 1;
a->skip_file_dev = d;
a->skip_file_ino = i;
return (ARCHIVE_OK);
}
static ssize_t
write_data_block(struct archive_write_disk *a, const char *buff, size_t size)
{
OVERLAPPED ol;
uint64_t start_size = size;
DWORD bytes_written = 0;
ssize_t block_size = 0, bytes_to_write;
if (size == 0)
return (ARCHIVE_OK);
if (a->filesize == 0 || a->fh == INVALID_HANDLE_VALUE) {
archive_set_error(&a->archive, 0,
"Attempt to write to an empty file");
return (ARCHIVE_WARN);
}
if (a->flags & ARCHIVE_EXTRACT_SPARSE) {
/* XXX TODO XXX Is there a more appropriate choice here ? */
/* This needn't match the filesystem allocation size. */
block_size = 16*1024;
}
/* If this write would run beyond the file size, truncate it. */
if (a->filesize >= 0 && (int64_t)(a->offset + size) > a->filesize)
start_size = size = (size_t)(a->filesize - a->offset);
/* Write the data. */
while (size > 0) {
if (block_size == 0) {
bytes_to_write = size;
} else {
/* We're sparsifying the file. */
const char *p, *end;
int64_t block_end;
/* Skip leading zero bytes. */
for (p = buff, end = buff + size; p < end; ++p) {
if (*p != '\0')
break;
}
a->offset += p - buff;
size -= p - buff;
buff = p;
if (size == 0)
break;
/* Calculate next block boundary after offset. */
block_end
= (a->offset / block_size + 1) * block_size;
/* If the adjusted write would cross block boundary,
* truncate it to the block boundary. */
bytes_to_write = size;
if (a->offset + bytes_to_write > block_end)
bytes_to_write = (DWORD)(block_end - a->offset);
}
memset(&ol, 0, sizeof(ol));
ol.Offset = (DWORD)(a->offset & 0xFFFFFFFF);
ol.OffsetHigh = (DWORD)(a->offset >> 32);
if (!WriteFile(a->fh, buff, (uint32_t)bytes_to_write,
&bytes_written, &ol)) {
DWORD lasterr;
lasterr = GetLastError();
if (lasterr == ERROR_ACCESS_DENIED)
errno = EBADF;
else
la_dosmaperr(lasterr);
archive_set_error(&a->archive, errno, "Write failed");
return (ARCHIVE_WARN);
}
buff += bytes_written;
size -= bytes_written;
a->total_bytes_written += bytes_written;
a->offset += bytes_written;
a->fd_offset = a->offset;
}
return ((ssize_t)(start_size - size));
}
static ssize_t
_archive_write_disk_data_block(struct archive *_a,
const void *buff, size_t size, int64_t offset)
{
struct archive_write_disk *a = (struct archive_write_disk *)_a;
ssize_t r;
archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC,
ARCHIVE_STATE_DATA, "archive_write_data_block");
a->offset = offset;
r = write_data_block(a, buff, size);
if (r < ARCHIVE_OK)
return (r);
if ((size_t)r < size) {
archive_set_error(&a->archive, 0,
"Write request too large");
return (ARCHIVE_WARN);
}
#if ARCHIVE_VERSION_NUMBER < 3999000
return (ARCHIVE_OK);
#else
return (size);
#endif
}
static ssize_t
_archive_write_disk_data(struct archive *_a, const void *buff, size_t size)
{
struct archive_write_disk *a = (struct archive_write_disk *)_a;
archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC,
ARCHIVE_STATE_DATA, "archive_write_data");
return (write_data_block(a, buff, size));
}
static int
_archive_write_disk_finish_entry(struct archive *_a)
{
struct archive_write_disk *a = (struct archive_write_disk *)_a;
int ret = ARCHIVE_OK;
archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC,
ARCHIVE_STATE_HEADER | ARCHIVE_STATE_DATA,
"archive_write_finish_entry");
if (a->archive.state & ARCHIVE_STATE_HEADER)
return (ARCHIVE_OK);
archive_clear_error(&a->archive);
/* Pad or truncate file to the right size. */
if (a->fh == INVALID_HANDLE_VALUE) {
/* There's no file. */
} else if (a->filesize < 0) {
/* File size is unknown, so we can't set the size. */
} else if (a->fd_offset == a->filesize) {
/* Last write ended at exactly the filesize; we're done. */
/* Hopefully, this is the common case. */
} else {
if (la_ftruncate(a->fh, a->filesize) == -1) {
archive_set_error(&a->archive, errno,
"File size could not be restored");
return (ARCHIVE_FAILED);
}
}
/* Restore metadata. */
/*
* Look up the "real" UID only if we're going to need it.
* TODO: the TODO_SGID condition can be dropped here, can't it?
*/
if (a->todo & (TODO_OWNER | TODO_SUID | TODO_SGID)) {
a->uid = archive_write_disk_uid(&a->archive,
archive_entry_uname(a->entry),
archive_entry_uid(a->entry));
}
/* Look up the "real" GID only if we're going to need it. */
/* TODO: the TODO_SUID condition can be dropped here, can't it? */
if (a->todo & (TODO_OWNER | TODO_SGID | TODO_SUID)) {
a->gid = archive_write_disk_gid(&a->archive,
archive_entry_gname(a->entry),
archive_entry_gid(a->entry));
}
/*
* Restore ownership before set_mode tries to restore suid/sgid
* bits. If we set the owner, we know what it is and can skip
* a stat() call to examine the ownership of the file on disk.
*/
if (a->todo & TODO_OWNER)
ret = set_ownership(a);
/*
* set_mode must precede ACLs on systems such as Solaris and
* FreeBSD where setting the mode implicitly clears extended ACLs
*/
if (a->todo & TODO_MODE) {
int r2 = set_mode(a, a->mode);
if (r2 < ret) ret = r2;
}
/*
* Security-related extended attributes (such as
* security.capability on Linux) have to be restored last,
* since they're implicitly removed by other file changes.
*/
if (a->todo & TODO_XATTR) {
int r2 = set_xattrs(a);
if (r2 < ret) ret = r2;
}
/*
* Some flags prevent file modification; they must be restored after
* file contents are written.
*/
if (a->todo & TODO_FFLAGS) {
int r2 = set_fflags(a);
if (r2 < ret) ret = r2;
}
/*
* Time must follow most other metadata;
* otherwise atime will get changed.
*/
if (a->todo & TODO_TIMES) {
int r2 = set_times_from_entry(a);
if (r2 < ret) ret = r2;
}
/*
* ACLs must be restored after timestamps because there are
* ACLs that prevent attribute changes (including time).
*/
if (a->todo & TODO_ACLS) {
int r2 = set_acls(a, a->fh,
archive_entry_pathname_w(a->entry),
archive_entry_acl(a->entry));
if (r2 < ret) ret = r2;
}
/* If there's an fd, we can close it now. */
if (a->fh != INVALID_HANDLE_VALUE) {
CloseHandle(a->fh);
a->fh = INVALID_HANDLE_VALUE;
if (a->tmpname) {
/* Windows does not support atomic rename */
disk_unlink(a->name);
if (_wrename(a->tmpname, a->name) != 0) {
la_dosmaperr(GetLastError());
archive_set_error(&a->archive, errno,
"Failed to rename temporary file");
ret = ARCHIVE_FAILED;
disk_unlink(a->tmpname);
}
a->tmpname = NULL;
}
}
/* If there's an entry, we can release it now. */
archive_entry_free(a->entry);
a->entry = NULL;
a->archive.state = ARCHIVE_STATE_HEADER;
return (ret);
}
int
archive_write_disk_set_group_lookup(struct archive *_a,
void *private_data,
la_int64_t (*lookup_gid)(void *private, const char *gname, la_int64_t gid),
void (*cleanup_gid)(void *private))
{
struct archive_write_disk *a = (struct archive_write_disk *)_a;
archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC,
ARCHIVE_STATE_ANY, "archive_write_disk_set_group_lookup");
if (a->cleanup_gid != NULL && a->lookup_gid_data != NULL)
(a->cleanup_gid)(a->lookup_gid_data);
a->lookup_gid = lookup_gid;
a->cleanup_gid = cleanup_gid;
a->lookup_gid_data = private_data;
return (ARCHIVE_OK);
}
int
archive_write_disk_set_user_lookup(struct archive *_a,
void *private_data,
int64_t (*lookup_uid)(void *private, const char *uname, int64_t uid),
void (*cleanup_uid)(void *private))
{
struct archive_write_disk *a = (struct archive_write_disk *)_a;
archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC,
ARCHIVE_STATE_ANY, "archive_write_disk_set_user_lookup");
if (a->cleanup_uid != NULL && a->lookup_uid_data != NULL)
(a->cleanup_uid)(a->lookup_uid_data);
a->lookup_uid = lookup_uid;
a->cleanup_uid = cleanup_uid;
a->lookup_uid_data = private_data;
return (ARCHIVE_OK);
}
int64_t
archive_write_disk_gid(struct archive *_a, const char *name, la_int64_t id)
{
struct archive_write_disk *a = (struct archive_write_disk *)_a;
archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC,
ARCHIVE_STATE_ANY, "archive_write_disk_gid");
if (a->lookup_gid)
return (a->lookup_gid)(a->lookup_gid_data, name, id);
return (id);
}
int64_t
archive_write_disk_uid(struct archive *_a, const char *name, la_int64_t id)
{
struct archive_write_disk *a = (struct archive_write_disk *)_a;
archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC,
ARCHIVE_STATE_ANY, "archive_write_disk_uid");
if (a->lookup_uid)
return (a->lookup_uid)(a->lookup_uid_data, name, id);
return (id);
}
/*
* Create a new archive_write_disk object and initialize it with global state.
*/
struct archive *
archive_write_disk_new(void)
{
struct archive_write_disk *a;
a = (struct archive_write_disk *)calloc(1, sizeof(*a));
if (a == NULL)
return (NULL);
a->archive.magic = ARCHIVE_WRITE_DISK_MAGIC;
/* We're ready to write a header immediately. */
a->archive.state = ARCHIVE_STATE_HEADER;
a->archive.vtable = archive_write_disk_vtable();
a->start_time = time(NULL);
/* Query and restore the umask. */
umask(a->user_umask = umask(0));
if (archive_wstring_ensure(&a->path_safe, 512) == NULL) {
free(a);
return (NULL);
}
return (&a->archive);
}
static int
disk_unlink(const wchar_t *path)
{
wchar_t *fullname;
int r;
r = _wunlink(path);
if (r != 0 && GetLastError() == ERROR_INVALID_NAME) {
fullname = __la_win_permissive_name_w(path);
r = _wunlink(fullname);
free(fullname);
}
return (r);
}
static int
disk_rmdir(const wchar_t *path)
{
wchar_t *fullname;
int r;
r = _wrmdir(path);
if (r != 0 && GetLastError() == ERROR_INVALID_NAME) {
fullname = __la_win_permissive_name_w(path);
r = _wrmdir(fullname);
free(fullname);
}
return (r);
}
/*
* The main restore function.
*/
static int
restore_entry(struct archive_write_disk *a)
{
int ret = ARCHIVE_OK, en;
if (a->flags & ARCHIVE_EXTRACT_UNLINK && !S_ISDIR(a->mode)) {
/*
* TODO: Fix this. Apparently, there are platforms
* that still allow root to hose the entire filesystem
* by unlinking a dir. The S_ISDIR() test above
* prevents us from using unlink() here if the new
* object is a dir, but that doesn't mean the old
* object isn't a dir.
*/
if (a->flags & ARCHIVE_EXTRACT_CLEAR_NOCHANGE_FFLAGS)
(void)clear_nochange_fflags(a);
if (disk_unlink(a->name) == 0) {
/* We removed it, reset cached stat. */
a->pst = NULL;
} else if (errno == ENOENT) {
/* File didn't exist, that's just as good. */
} else if (disk_rmdir(a->name) == 0) {
/* It was a dir, but now it's gone. */
a->pst = NULL;
} else {
/* We tried, but couldn't get rid of it. */
archive_set_error(&a->archive, errno,
"Could not unlink");
return(ARCHIVE_FAILED);
}
}
/* Try creating it first; if this fails, we'll try to recover. */
en = create_filesystem_object(a);
if ((en == ENOTDIR || en == ENOENT)
&& !(a->flags & ARCHIVE_EXTRACT_NO_AUTODIR)) {
wchar_t *full;
/* If the parent dir doesn't exist, try creating it. */
create_parent_dir(a, a->name);
/* Now try to create the object again. */
full = __la_win_permissive_name_w(a->name);
if (full == NULL) {
en = EINVAL;
} else {
/* Remove multiple directories such as "a/../b../c" */
archive_wstrcpy(&(a->_name_data), full);
a->name = a->_name_data.s;
free(full);
en = create_filesystem_object(a);
}
}
if ((en == ENOENT) && (archive_entry_hardlink(a->entry) != NULL)) {
archive_set_error(&a->archive, en,
"Hard-link target '%s' does not exist.",
archive_entry_hardlink(a->entry));
return (ARCHIVE_FAILED);
}
if ((en == EISDIR || en == EEXIST)
&& (a->flags & ARCHIVE_EXTRACT_NO_OVERWRITE)) {
/* If we're not overwriting, we're done. */
if (S_ISDIR(a->mode)) {
/* Don't overwrite any settings on existing directories. */
a->todo = 0;
}
archive_entry_unset_size(a->entry);
return (ARCHIVE_OK);
}
/*
* Some platforms return EISDIR if you call
* open(O_WRONLY | O_EXCL | O_CREAT) on a directory, some
* return EEXIST. POSIX is ambiguous, requiring EISDIR
* for open(O_WRONLY) on a dir and EEXIST for open(O_EXCL | O_CREAT)
* on an existing item.
*/
if (en == EISDIR) {
/* A dir is in the way of a non-dir, rmdir it. */
if (disk_rmdir(a->name) != 0) {
archive_set_error(&a->archive, errno,
"Can't remove already-existing dir");
return (ARCHIVE_FAILED);
}
a->pst = NULL;
/* Try again. */
en = create_filesystem_object(a);
} else if (en == EEXIST) {
mode_t st_mode;
mode_t lst_mode;
BY_HANDLE_FILE_INFORMATION lst;
/*
* We know something is in the way, but we don't know what;
* we need to find out before we go any further.
*/
int r = 0;
int dirlnk = 0;
/*
* The SECURE_SYMLINK logic has already removed a
* symlink to a dir if the client wants that. So
* follow the symlink if we're creating a dir.
* If it's not a dir (or it's a broken symlink),
* then don't follow it.
*
* Windows distinguishes file and directory symlinks.
* A file symlink may erroneously point to a directory
* and a directory symlink to a file. Windows does not follow
* such symlinks. We always need both source and target
* information.
*/
r = file_information(a, a->name, &lst, &lst_mode, 1);
if (r != 0) {
archive_set_error(&a->archive, errno,
"Can't stat existing object");
return (ARCHIVE_FAILED);
} else if (S_ISLNK(lst_mode)) {
if (lst.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
dirlnk = 1;
/* In case of a symlink we need target information */
r = file_information(a, a->name, &a->st, &st_mode, 0);
if (r != 0) {
a->st = lst;
st_mode = lst_mode;
}
} else {
a->st = lst;
st_mode = lst_mode;
}
/*
* NO_OVERWRITE_NEWER doesn't apply to directories.
*/
if ((a->flags & ARCHIVE_EXTRACT_NO_OVERWRITE_NEWER)
&& !S_ISDIR(st_mode)) {
if (!older(&(a->st), a->entry)) {
archive_entry_unset_size(a->entry);
return (ARCHIVE_OK);
}
}
/* If it's our archive, we're done. */
if (a->skip_file_set &&
bhfi_dev(&a->st) == a->skip_file_dev &&
bhfi_ino(&a->st) == a->skip_file_ino) {
archive_set_error(&a->archive, 0,
"Refusing to overwrite archive");
return (ARCHIVE_FAILED);
}
if (!S_ISDIR(st_mode)) {
if (a->flags &
ARCHIVE_EXTRACT_CLEAR_NOCHANGE_FFLAGS) {
(void)clear_nochange_fflags(a);
}
if ((a->flags & ARCHIVE_EXTRACT_SAFE_WRITES) &&
S_ISREG(st_mode)) {
int fd = la_mktemp(a);
if (fd == -1) {
la_dosmaperr(GetLastError());
archive_set_error(&a->archive, errno,
"Can't create temporary file");
return (ARCHIVE_FAILED);
}
a->fh = (HANDLE)_get_osfhandle(fd);
if (a->fh == INVALID_HANDLE_VALUE) {
la_dosmaperr(GetLastError());
return (ARCHIVE_FAILED);
}
a->pst = NULL;
en = 0;
} else {
if (dirlnk) {
/* Edge case: dir symlink pointing
* to a file */
if (disk_rmdir(a->name) != 0) {
archive_set_error(&a->archive,
errno, "Can't unlink "
"directory symlink");
return (ARCHIVE_FAILED);
}
} else {
if (disk_unlink(a->name) != 0) {
/* A non-dir is in the way,
* unlink it. */
archive_set_error(&a->archive,
errno, "Can't unlink "
"already-existing object");
return (ARCHIVE_FAILED);
}
}
a->pst = NULL;
/* Try again. */
en = create_filesystem_object(a);
}
} else if (!S_ISDIR(a->mode)) {
/* A dir is in the way of a non-dir, rmdir it. */
if (a->flags & ARCHIVE_EXTRACT_CLEAR_NOCHANGE_FFLAGS)
(void)clear_nochange_fflags(a);
if (disk_rmdir(a->name) != 0) {
archive_set_error(&a->archive, errno,
"Can't remove already-existing dir");
return (ARCHIVE_FAILED);
}
/* Try again. */
en = create_filesystem_object(a);
} else {
/*
* There's a dir in the way of a dir. Don't
* waste time with rmdir()/mkdir(), just fix
* up the permissions on the existing dir.
* Note that we don't change perms on existing
* dirs unless _EXTRACT_PERM is specified.
*/
if ((a->mode != st_mode)
&& (a->todo & TODO_MODE_FORCE))
a->deferred |= (a->todo & TODO_MODE);
/* Ownership doesn't need deferred fixup. */
en = 0; /* Forget the EEXIST. */
}
}
if (en) {
/* Everything failed; give up here. */
archive_set_error(&a->archive, en, "Can't create '%ls'",
a->name);
return (ARCHIVE_FAILED);
}
a->pst = NULL; /* Cached stat data no longer valid. */
return (ret);
}
/*
* Returns 0 if creation succeeds, or else returns errno value from
* the failed system call. Note: This function should only ever perform
* a single system call.
*/
static int
create_filesystem_object(struct archive_write_disk *a)
{
/* Create the entry. */
const wchar_t *linkname;
wchar_t *fullname;
mode_t final_mode, mode;
int r;
DWORD attrs = 0;
/* We identify hard/symlinks according to the link names. */
/* Since link(2) and symlink(2) don't handle modes, we're done here. */
linkname = archive_entry_hardlink_w(a->entry);
if (linkname != NULL) {
wchar_t *linkfull, *namefull;
linkfull = __la_win_permissive_name_w(linkname);
namefull = __la_win_permissive_name_w(a->name);
if (linkfull == NULL || namefull == NULL) {
errno = EINVAL;
r = -1;
} else {
/*
* Unlinking and linking here is really not atomic,
* but doing it right, would require us to construct
* an mktemplink() function, and then use _wrename().
*/
if (a->flags & ARCHIVE_EXTRACT_SAFE_WRITES) {
attrs = GetFileAttributesW(namefull);
if (attrs != INVALID_FILE_ATTRIBUTES) {
if (attrs & FILE_ATTRIBUTE_DIRECTORY)
disk_rmdir(namefull);
else
disk_unlink(namefull);
}
}
r = la_CreateHardLinkW(namefull, linkfull);
if (r == 0) {
la_dosmaperr(GetLastError());
r = errno;
} else
r = 0;
}
/*
* New cpio and pax formats allow hardlink entries
* to carry data, so we may have to open the file
* for hardlink entries.
*
* If the hardlink was successfully created and
* the archive doesn't have carry data for it,
* consider it to be non-authoritative for meta data.
* This is consistent with GNU tar and BSD pax.
* If the hardlink does carry data, let the last
* archive entry decide ownership.
*/
if (r == 0 && a->filesize <= 0) {
a->todo = 0;
a->deferred = 0;
} else if (r == 0 && a->filesize > 0) {
a->fh = CreateFileW(namefull, GENERIC_WRITE, 0, NULL,
TRUNCATE_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
if (a->fh == INVALID_HANDLE_VALUE) {
la_dosmaperr(GetLastError());
r = errno;
}
}
free(linkfull);
free(namefull);
return (r);
}
linkname = archive_entry_symlink_w(a->entry);
if (linkname != NULL) {
/*
* Unlinking and linking here is really not atomic,
* but doing it right, would require us to construct
* an mktemplink() function, and then use _wrename().
*/
attrs = GetFileAttributesW(a->name);
if (attrs != INVALID_FILE_ATTRIBUTES) {
if (attrs & FILE_ATTRIBUTE_DIRECTORY)
disk_rmdir(a->name);
else
disk_unlink(a->name);
}
#if HAVE_SYMLINK
return symlink(linkname, a->name) ? errno : 0;
#else
errno = 0;
r = la_CreateSymbolicLinkW((const wchar_t *)a->name, linkname,
archive_entry_symlink_type(a->entry));
if (r == 0) {
if (errno == 0)
la_dosmaperr(GetLastError());
r = errno;
} else
r = 0;
return (r);
#endif
}
/*
* The remaining system calls all set permissions, so let's
* try to take advantage of that to avoid an extra chmod()
* call. (Recall that umask is set to zero right now!)
*/
/* Mode we want for the final restored object (w/o file type bits). */
final_mode = a->mode & 07777;
/*
* The mode that will actually be restored in this step. Note
* that SUID, SGID, etc, require additional work to ensure
* security, so we never restore them at this point.
*/
mode = final_mode & 0777 & ~a->user_umask;
switch (a->mode & AE_IFMT) {
default:
/* POSIX requires that we fall through here. */
/* FALLTHROUGH */
case AE_IFREG:
a->tmpname = NULL;
fullname = a->name;
/* O_WRONLY | O_CREAT | O_EXCL */
a->fh = CreateFileW(fullname, GENERIC_WRITE, 0, NULL,
CREATE_NEW, FILE_ATTRIBUTE_NORMAL, NULL);
if (a->fh == INVALID_HANDLE_VALUE &&
GetLastError() == ERROR_INVALID_NAME &&
fullname == a->name) {
fullname = __la_win_permissive_name_w(a->name);
a->fh = CreateFileW(fullname, GENERIC_WRITE, 0, NULL,
CREATE_NEW, FILE_ATTRIBUTE_NORMAL, NULL);
}
if (a->fh == INVALID_HANDLE_VALUE) {
if (GetLastError() == ERROR_ACCESS_DENIED) {
DWORD attr;
/* Simulate an errno of POSIX system. */
attr = GetFileAttributesW(fullname);
if (attr == (DWORD)-1)
la_dosmaperr(GetLastError());
else if (attr & FILE_ATTRIBUTE_DIRECTORY)
errno = EISDIR;
else
errno = EACCES;
} else
la_dosmaperr(GetLastError());
r = 1;
} else
r = 0;
if (fullname != a->name)
free(fullname);
break;
case AE_IFCHR:
case AE_IFBLK:
/* TODO: Find a better way to warn about our inability
* to restore a block device node. */
return (EINVAL);
case AE_IFDIR:
mode = (mode | MINIMUM_DIR_MODE) & MAXIMUM_DIR_MODE;
fullname = a->name;
r = CreateDirectoryW(fullname, NULL);
if (r == 0 && GetLastError() == ERROR_INVALID_NAME &&
fullname == a->name) {
fullname = __la_win_permissive_name_w(a->name);
r = CreateDirectoryW(fullname, NULL);
}
if (r != 0) {
r = 0;
/* Defer setting dir times. */
a->deferred |= (a->todo & TODO_TIMES);
a->todo &= ~TODO_TIMES;
/* Never use an immediate chmod(). */
/* We can't avoid the chmod() entirely if EXTRACT_PERM
* because of SysV SGID inheritance. */
if ((mode != final_mode)
|| (a->flags & ARCHIVE_EXTRACT_PERM))
a->deferred |= (a->todo & TODO_MODE);
a->todo &= ~TODO_MODE;
} else {
la_dosmaperr(GetLastError());
r = -1;
}
if (fullname != a->name)
free(fullname);
break;
case AE_IFIFO:
/* TODO: Find a better way to warn about our inability
* to restore a fifo. */
return (EINVAL);
}
/* All the system calls above set errno on failure. */
if (r)
return (errno);
/* If we managed to set the final mode, we've avoided a chmod(). */
if (mode == final_mode)
a->todo &= ~TODO_MODE;
return (0);
}
/*
* Cleanup function for archive_extract. Mostly, this involves processing
* the fixup list, which is used to address a number of problems:
* * Dir permissions might prevent us from restoring a file in that
* dir, so we restore the dir with minimum 0700 permissions first,
* then correct the mode at the end.
* * Similarly, the act of restoring a file touches the directory
* and changes the timestamp on the dir, so we have to touch-up dir
* timestamps at the end as well.
* * Some file flags can interfere with the restore by, for example,
* preventing the creation of hardlinks to those files.
* * Mac OS extended metadata includes ACLs, so must be deferred on dirs.
*
* Note that tar/cpio do not require that archives be in a particular
* order; there is no way to know when the last file has been restored
* within a directory, so there's no way to optimize the memory usage
* here by fixing up the directory any earlier than the
* end-of-archive.
*
* XXX TODO: Directory ACLs should be restored here, for the same
* reason we set directory perms here. XXX
*/
static int
_archive_write_disk_close(struct archive *_a)
{
struct archive_write_disk *a = (struct archive_write_disk *)_a;
struct fixup_entry *next, *p;
int ret;
archive_check_magic(&a->archive, ARCHIVE_WRITE_DISK_MAGIC,
ARCHIVE_STATE_HEADER | ARCHIVE_STATE_DATA,
"archive_write_disk_close");
ret = _archive_write_disk_finish_entry(&a->archive);
/* Sort dir list so directories are fixed up in depth-first order. */
p = sort_dir_list(a->fixup_list);
while (p != NULL) {
a->pst = NULL; /* Mark stat cache as out-of-date. */
if (p->fixup & TODO_TIMES) {
set_times(a, INVALID_HANDLE_VALUE, p->mode, p->name,
p->atime, p->atime_nanos,
p->birthtime, p->birthtime_nanos,
p->mtime, p->mtime_nanos,
p->ctime, p->ctime_nanos);
}
if (p->fixup & TODO_MODE_BASE)
la_chmod(p->name, p->mode);
if (p->fixup & TODO_ACLS)
set_acls(a, INVALID_HANDLE_VALUE, p->name, &p->acl);
if (p->fixup & TODO_FFLAGS)
set_fflags_platform(p->name, p->fflags_set, 0);
next = p->next;
archive_acl_clear(&p->acl);
free(p->name);
free(p);
p = next;
}
a->fixup_list = NULL;
return (ret);
}
static int
_archive_write_disk_free(struct archive *_a)
{
struct archive_write_disk *a;
int ret;
if (_a == NULL)
return (ARCHIVE_OK);
archive_check_magic(_a, ARCHIVE_WRITE_DISK_MAGIC,
ARCHIVE_STATE_ANY | ARCHIVE_STATE_FATAL, "archive_write_disk_free");
a = (struct archive_write_disk *)_a;
ret = _archive_write_disk_close(&a->archive);
archive_write_disk_set_group_lookup(&a->archive, NULL, NULL, NULL);
archive_write_disk_set_user_lookup(&a->archive, NULL, NULL, NULL);
archive_entry_free(a->entry);
archive_wstring_free(&a->_name_data);
archive_wstring_free(&a->_tmpname_data);
archive_string_free(&a->archive.error_string);
archive_wstring_free(&a->path_safe);
a->archive.magic = 0;
__archive_clean(&a->archive);
free(a);
return (ret);
}
/*
* Simple O(n log n) merge sort to order the fixup list. In
* particular, we want to restore dir timestamps depth-first.
*/
static struct fixup_entry *
sort_dir_list(struct fixup_entry *p)
{
struct fixup_entry *a, *b, *t;
if (p == NULL)
return (NULL);
/* A one-item list is already sorted. */
if (p->next == NULL)
return (p);
/* Step 1: split the list. */
t = p;
a = p->next->next;
while (a != NULL) {
/* Step a twice, t once. */
a = a->next;
if (a != NULL)
a = a->next;
t = t->next;
}
/* Now, t is at the mid-point, so break the list here. */
b = t->next;
t->next = NULL;
a = p;
/* Step 2: Recursively sort the two sub-lists. */
a = sort_dir_list(a);
b = sort_dir_list(b);
/* Step 3: Merge the returned lists. */
/* Pick the first element for the merged list. */
if (wcscmp(a->name, b->name) > 0) {
t = p = a;
a = a->next;
} else {
t = p = b;
b = b->next;
}
/* Always put the later element on the list first. */
while (a != NULL && b != NULL) {
if (wcscmp(a->name, b->name) > 0) {
t->next = a;
a = a->next;
} else {
t->next = b;
b = b->next;
}
t = t->next;
}
/* Only one list is non-empty, so just splice it on. */
if (a != NULL)
t->next = a;
if (b != NULL)
t->next = b;
return (p);
}
/*
* Returns a new, initialized fixup entry.
*
* TODO: Reduce the memory requirements for this list by using a tree
* structure rather than a simple list of names.
*/
static struct fixup_entry *
new_fixup(struct archive_write_disk *a, const wchar_t *pathname)
{
struct fixup_entry *fe;
fe = (struct fixup_entry *)calloc(1, sizeof(struct fixup_entry));
if (fe == NULL)
return (NULL);
fe->next = a->fixup_list;
a->fixup_list = fe;
fe->fixup = 0;
fe->name = _wcsdup(pathname);
fe->fflags_set = 0;
return (fe);
}
/*
* Returns a fixup structure for the current entry.
*/
static struct fixup_entry *
current_fixup(struct archive_write_disk *a, const wchar_t *pathname)
{
if (a->current_fixup == NULL)
a->current_fixup = new_fixup(a, pathname);
return (a->current_fixup);
}
/*
* TODO: The deep-directory support bypasses this; disable deep directory
* support if we're doing symlink checks.
*/
/*
* TODO: Someday, integrate this with the deep dir support; they both
* scan the path and both can be optimized by comparing against other
* recent paths.
*/
static int
check_symlinks(struct archive_write_disk *a)
{
wchar_t *pn, *p;
wchar_t c;
int r;
BY_HANDLE_FILE_INFORMATION st;
mode_t st_mode;
/*
* Guard against symlink tricks. Reject any archive entry whose
* destination would be altered by a symlink.
*/
/* Whatever we checked last time doesn't need to be re-checked. */
pn = a->name;
p = a->path_safe.s;
while ((*pn != '\0') && (*p == *pn))
++p, ++pn;
/* Skip leading backslashes */
while (*pn == '\\')
++pn;
c = pn[0];
/* Keep going until we've checked the entire name. */
while (pn[0] != '\0' && (pn[0] != '\\' || pn[1] != '\0')) {
/* Skip the next path element. */
while (*pn != '\0' && *pn != '\\')
++pn;
c = pn[0];
pn[0] = '\0';
/* Check that we haven't hit a symlink. */
r = file_information(a, a->name, &st, &st_mode, 1);
if (r != 0) {
/* We've hit a dir that doesn't exist; stop now. */
if (errno == ENOENT)
break;
} else if (S_ISLNK(st_mode)) {
if (c == '\0') {
/*
* Last element is a file or directory symlink.
* Remove it so we can overwrite it with the
* item being extracted.
*/
if (a->flags &
ARCHIVE_EXTRACT_CLEAR_NOCHANGE_FFLAGS) {
(void)clear_nochange_fflags(a);
}
if (st.dwFileAttributes &
FILE_ATTRIBUTE_DIRECTORY) {
r = disk_rmdir(a->name);
} else {
r = disk_unlink(a->name);
}
if (r) {
archive_set_error(&a->archive, errno,
"Could not remove symlink %ls",
a->name);
pn[0] = c;
return (ARCHIVE_FAILED);
}
a->pst = NULL;
/*
* Even if we did remove it, a warning
* is in order. The warning is silly,
* though, if we're just replacing one
* symlink with another symlink.
*/
if (!S_ISLNK(a->mode)) {
archive_set_error(&a->archive, 0,
"Removing symlink %ls",
a->name);
}
/* Symlink gone. No more problem! */
pn[0] = c;
return (0);
} else if (a->flags & ARCHIVE_EXTRACT_UNLINK) {
/* User asked us to remove problems. */
if (a->flags &
ARCHIVE_EXTRACT_CLEAR_NOCHANGE_FFLAGS) {
(void)clear_nochange_fflags(a);
}
if (st.dwFileAttributes &
FILE_ATTRIBUTE_DIRECTORY) {
r = disk_rmdir(a->name);
} else {
r = disk_unlink(a->name);
}
if (r != 0) {
archive_set_error(&a->archive, 0,
"Cannot remove intervening "
"symlink %ls", a->name);
pn[0] = c;
return (ARCHIVE_FAILED);
}
a->pst = NULL;
} else {
archive_set_error(&a->archive, 0,
"Cannot extract through symlink %ls",
a->name);
pn[0] = c;
return (ARCHIVE_FAILED);
}
}
pn[0] = c;
pn++;
}
pn[0] = c;
/* We've checked and/or cleaned the whole path, so remember it. */
archive_wstrcpy(&a->path_safe, a->name);
return (ARCHIVE_OK);
}
static int
guidword(wchar_t *p, int n)
{
int i;
for (i = 0; i < n; i++) {
if ((*p >= L'0' && *p <= L'9') ||
(*p >= L'a' && *p <= L'f') ||
(*p >= L'A' && *p <= L'F'))
p++;
else
return (-1);
}
return (0);
}
/*
* Canonicalize the pathname. In particular, this strips duplicate
* '\' characters, '.' elements, and trailing '\'. It also raises an
* error for an empty path, a trailing '..' or (if _SECURE_NODOTDOT is
* set) any '..' in the path.
*/
static int
cleanup_pathname(struct archive_write_disk *a)
{
wchar_t *dest, *src, *p, *top;
wchar_t separator = L'\0';
p = a->name;
if (*p == L'\0') {
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"Invalid empty pathname");
return (ARCHIVE_FAILED);
}
/* Replace '/' by '\' */
for (; *p != L'\0'; p++) {
if (*p == L'/')
*p = L'\\';
}
p = a->name;
/* Skip leading "\\.\" or "\\?\" or "\\?\UNC\" or
* "\\?\Volume{GUID}\"
* (absolute path prefixes used by Windows API) */
if (p[0] == L'\\' && p[1] == L'\\' &&
(p[2] == L'.' || p[2] == L'?') && p[3] == L'\\')
{
/* A path begin with "\\?\UNC\" */
if (p[2] == L'?' &&
(p[4] == L'U' || p[4] == L'u') &&
(p[5] == L'N' || p[5] == L'n') &&
(p[6] == L'C' || p[6] == L'c') &&
p[7] == L'\\')
p += 8;
/* A path begin with "\\?\Volume{GUID}\" */
else if (p[2] == L'?' &&
(p[4] == L'V' || p[4] == L'v') &&
(p[5] == L'O' || p[5] == L'o') &&
(p[6] == L'L' || p[6] == L'l') &&
(p[7] == L'U' || p[7] == L'u') &&
(p[8] == L'M' || p[8] == L'm') &&
(p[9] == L'E' || p[9] == L'e') &&
p[10] == L'{') {
if (guidword(p+11, 8) == 0 && p[19] == L'-' &&
guidword(p+20, 4) == 0 && p[24] == L'-' &&
guidword(p+25, 4) == 0 && p[29] == L'-' &&
guidword(p+30, 4) == 0 && p[34] == L'-' &&
guidword(p+35, 12) == 0 && p[47] == L'}' &&
p[48] == L'\\')
p += 49;
else
p += 4;
/* A path begin with "\\.\PhysicalDriveX" */
} else if (p[2] == L'.' &&
(p[4] == L'P' || p[4] == L'p') &&
(p[5] == L'H' || p[5] == L'h') &&
(p[6] == L'Y' || p[6] == L'y') &&
(p[7] == L'S' || p[7] == L's') &&
(p[8] == L'I' || p[8] == L'i') &&
(p[9] == L'C' || p[9] == L'c') &&
(p[9] == L'A' || p[9] == L'a') &&
(p[9] == L'L' || p[9] == L'l') &&
(p[9] == L'D' || p[9] == L'd') &&
(p[9] == L'R' || p[9] == L'r') &&
(p[9] == L'I' || p[9] == L'i') &&
(p[9] == L'V' || p[9] == L'v') &&
(p[9] == L'E' || p[9] == L'e') &&
(p[10] >= L'0' && p[10] <= L'9') &&
p[11] == L'\0') {
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"Path is a physical drive name");
return (ARCHIVE_FAILED);
} else
p += 4;
}
/* Skip leading drive letter from archives created
* on Windows. */
if (((p[0] >= L'a' && p[0] <= L'z') ||
(p[0] >= L'A' && p[0] <= L'Z')) &&
p[1] == L':') {
if (p[2] == L'\0') {
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"Path is a drive name");
return (ARCHIVE_FAILED);
}
if (p[2] == L'\\')
p += 2;
}
top = dest = src = p;
/* Rewrite the path name if its character is a unusable. */
for (; *p != L'\0'; p++) {
if (*p == L':' || *p == L'*' || *p == L'?' || *p == L'"' ||
*p == L'<' || *p == L'>' || *p == L'|')
*p = L'_';
}
/* Skip leading '\'. */
if (*src == L'\\')
separator = *src++;
/* Scan the pathname one element at a time. */
for (;;) {
/* src points to first char after '\' */
if (src[0] == L'\0') {
break;
} else if (src[0] == L'\\') {
/* Found '\\'('//'), ignore second one. */
src++;
continue;
} else if (src[0] == L'.') {
if (src[1] == L'\0') {
/* Ignore trailing '.' */
break;
} else if (src[1] == L'\\') {
/* Skip '.\'. */
src += 2;
continue;
} else if (src[1] == L'.') {
if (src[2] == L'\\' || src[2] == L'\0') {
/* Conditionally warn about '..' */
if (a->flags &
ARCHIVE_EXTRACT_SECURE_NODOTDOT) {
archive_set_error(&a->archive,
ARCHIVE_ERRNO_MISC,
"Path contains '..'");
return (ARCHIVE_FAILED);
}
}
/*
* Note: Under no circumstances do we
* remove '..' elements. In
* particular, restoring
* '\foo\..\bar\' should create the
* 'foo' dir as a side-effect.
*/
}
}
/* Copy current element, including leading '\'. */
if (separator)
*dest++ = L'\\';
while (*src != L'\0' && *src != L'\\') {
*dest++ = *src++;
}
if (*src == L'\0')
break;
/* Skip '\' separator. */
separator = *src++;
}
/*
* We've just copied zero or more path elements, not including the
* final '\'.
*/
if (dest == top) {
/*
* Nothing got copied. The path must have been something
* like '.' or '\' or './' or '/././././/./'.
*/
if (separator)
*dest++ = L'\\';
else
*dest++ = L'.';
}
/* Terminate the result. */
*dest = L'\0';
return (ARCHIVE_OK);
}
/*
* Create the parent directory of the specified path, assuming path
* is already in mutable storage.
*/
static int
create_parent_dir(struct archive_write_disk *a, wchar_t *path)
{
wchar_t *slash;
int r;
/* Remove tail element to obtain parent name. */
slash = wcsrchr(path, L'\\');
if (slash == NULL)
return (ARCHIVE_OK);
*slash = L'\0';
r = create_dir(a, path);
*slash = L'\\';
return (r);
}
/*
* Create the specified dir, recursing to create parents as necessary.
*
* Returns ARCHIVE_OK if the path exists when we're done here.
* Otherwise, returns ARCHIVE_FAILED.
* Assumes path is in mutable storage; path is unchanged on exit.
*/
static int
create_dir(struct archive_write_disk *a, wchar_t *path)
{
BY_HANDLE_FILE_INFORMATION st;
struct fixup_entry *le;
wchar_t *slash, *base, *full;
mode_t mode_final, mode, st_mode;
int r;
/* Check for special names and just skip them. */
slash = wcsrchr(path, L'\\');
if (slash == NULL)
base = path;
else
base = slash + 1;
if (base[0] == L'\0' ||
(base[0] == L'.' && base[1] == L'\0') ||
(base[0] == L'.' && base[1] == L'.' && base[2] == L'\0')) {
/* Don't bother trying to create null path, '.', or '..'. */
if (slash != NULL) {
*slash = L'\0';
r = create_dir(a, path);
*slash = L'\\';
return (r);
}
return (ARCHIVE_OK);
}
/*
* Yes, this should be stat() and not lstat(). Using lstat()
* here loses the ability to extract through symlinks. Also note
* that this should not use the a->st cache.
*/
if (file_information(a, path, &st, &st_mode, 0) == 0) {
if (S_ISDIR(st_mode))
return (ARCHIVE_OK);
if ((a->flags & ARCHIVE_EXTRACT_NO_OVERWRITE)) {
archive_set_error(&a->archive, EEXIST,
"Can't create directory '%ls'", path);
return (ARCHIVE_FAILED);
}
if (disk_unlink(path) != 0) {
archive_set_error(&a->archive, errno,
"Can't create directory '%ls': "
"Conflicting file cannot be removed",
path);
return (ARCHIVE_FAILED);
}
} else if (errno != ENOENT && errno != ENOTDIR) {
/* Stat failed? */
archive_set_error(&a->archive, errno,
"Can't test directory '%ls'", path);
return (ARCHIVE_FAILED);
} else if (slash != NULL) {
*slash = '\0';
r = create_dir(a, path);
*slash = '\\';
if (r != ARCHIVE_OK)
return (r);
}
/*
* Mode we want for the final restored directory. Per POSIX,
* implicitly-created dirs must be created obeying the umask.
* There's no mention whether this is different for privileged
* restores (which the rest of this code handles by pretending
* umask=0). I've chosen here to always obey the user's umask for
* implicit dirs, even if _EXTRACT_PERM was specified.
*/
mode_final = DEFAULT_DIR_MODE & ~a->user_umask;
/* Mode we want on disk during the restore process. */
mode = mode_final;
mode |= MINIMUM_DIR_MODE;
mode &= MAXIMUM_DIR_MODE;
/*
* Apply __la_win_permissive_name_w to path in order to
* remove '../' path string.
*/
full = __la_win_permissive_name_w(path);
if (full == NULL)
errno = EINVAL;
else if (CreateDirectoryW(full, NULL) != 0) {
if (mode != mode_final) {
le = new_fixup(a, path);
le->fixup |=TODO_MODE_BASE;
le->mode = mode_final;
}
free(full);
return (ARCHIVE_OK);
} else {
la_dosmaperr(GetLastError());
}
free(full);
/*
* Without the following check, a/b/../b/c/d fails at the
* second visit to 'b', so 'd' can't be created. Note that we
* don't add it to the fixup list here, as it's already been
* added.
*/
if (file_information(a, path, &st, &st_mode, 0) == 0 &&
S_ISDIR(st_mode))
return (ARCHIVE_OK);
archive_set_error(&a->archive, errno, "Failed to create dir '%ls'",
path);
return (ARCHIVE_FAILED);
}
/*
* Note: Although we can skip setting the user id if the desired user
* id matches the current user, we cannot skip setting the group, as
* many systems set the gid based on the containing directory. So
* we have to perform a chown syscall if we want to set the SGID
* bit. (The alternative is to stat() and then possibly chown(); it's
* more efficient to skip the stat() and just always chown().) Note
* that a successful chown() here clears the TODO_SGID_CHECK bit, which
* allows set_mode to skip the stat() check for the GID.
*/
static int
set_ownership(struct archive_write_disk *a)
{
/* unfortunately, on win32 there is no 'root' user with uid 0,
so we just have to try the chown and see if it works */
/* If we know we can't change it, don't bother trying. */
if (a->user_uid != 0 && a->user_uid != a->uid) {
archive_set_error(&a->archive, errno,
"Can't set UID=%jd", (intmax_t)a->uid);
return (ARCHIVE_WARN);
}
archive_set_error(&a->archive, errno,
"Can't set user=%jd/group=%jd for %ls",
(intmax_t)a->uid, (intmax_t)a->gid, a->name);
return (ARCHIVE_WARN);
}
static int
set_times(struct archive_write_disk *a,
HANDLE h, int mode, const wchar_t *name,
time_t atime, long atime_nanos,
time_t birthtime, long birthtime_nanos,
time_t mtime, long mtime_nanos,
time_t ctime_sec, long ctime_nanos)
{
#define EPOC_TIME ARCHIVE_LITERAL_ULL(116444736000000000)
#define WINTIME(sec, nsec) ((Int32x32To64(sec, 10000000) + EPOC_TIME)\
+ (((nsec)/1000)*10))
HANDLE hw = 0;
ULARGE_INTEGER wintm;
FILETIME *pfbtime;
FILETIME fatime, fbtime, fmtime;
(void)ctime_sec; /* UNUSED */
(void)ctime_nanos; /* UNUSED */
if (h != INVALID_HANDLE_VALUE) {
hw = NULL;
} else {
wchar_t *ws;
if (S_ISLNK(mode))
return (ARCHIVE_OK);
ws = __la_win_permissive_name_w(name);
if (ws == NULL)
goto settimes_failed;
hw = CreateFileW(ws, FILE_WRITE_ATTRIBUTES,
0, NULL, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, NULL);
free(ws);
if (hw == INVALID_HANDLE_VALUE)
goto settimes_failed;
h = hw;
}
wintm.QuadPart = WINTIME(atime, atime_nanos);
fatime.dwLowDateTime = wintm.LowPart;
fatime.dwHighDateTime = wintm.HighPart;
wintm.QuadPart = WINTIME(mtime, mtime_nanos);
fmtime.dwLowDateTime = wintm.LowPart;
fmtime.dwHighDateTime = wintm.HighPart;
/*
* SetFileTime() supports birthtime.
*/
if (birthtime > 0 || birthtime_nanos > 0) {
wintm.QuadPart = WINTIME(birthtime, birthtime_nanos);
fbtime.dwLowDateTime = wintm.LowPart;
fbtime.dwHighDateTime = wintm.HighPart;
pfbtime = &fbtime;
} else
pfbtime = NULL;
if (SetFileTime(h, pfbtime, &fatime, &fmtime) == 0)
goto settimes_failed;
CloseHandle(hw);
return (ARCHIVE_OK);
settimes_failed:
CloseHandle(hw);
archive_set_error(&a->archive, EINVAL, "Can't restore time");
return (ARCHIVE_WARN);
}
static int
set_times_from_entry(struct archive_write_disk *a)
{
time_t atime, birthtime, mtime, ctime_sec;
long atime_nsec, birthtime_nsec, mtime_nsec, ctime_nsec;
/* Suitable defaults. */
atime = birthtime = mtime = ctime_sec = a->start_time;
atime_nsec = birthtime_nsec = mtime_nsec = ctime_nsec = 0;
/* If no time was provided, we're done. */
if (!archive_entry_atime_is_set(a->entry)
&& !archive_entry_birthtime_is_set(a->entry)
&& !archive_entry_mtime_is_set(a->entry))
return (ARCHIVE_OK);
if (archive_entry_atime_is_set(a->entry)) {
atime = archive_entry_atime(a->entry);
atime_nsec = archive_entry_atime_nsec(a->entry);
}
if (archive_entry_birthtime_is_set(a->entry)) {
birthtime = archive_entry_birthtime(a->entry);
birthtime_nsec = archive_entry_birthtime_nsec(a->entry);
}
if (archive_entry_mtime_is_set(a->entry)) {
mtime = archive_entry_mtime(a->entry);
mtime_nsec = archive_entry_mtime_nsec(a->entry);
}
if (archive_entry_ctime_is_set(a->entry)) {
ctime_sec = archive_entry_ctime(a->entry);
ctime_nsec = archive_entry_ctime_nsec(a->entry);
}
return set_times(a, a->fh, a->mode, a->name,
atime, atime_nsec,
birthtime, birthtime_nsec,
mtime, mtime_nsec,
ctime_sec, ctime_nsec);
}
static int
set_mode(struct archive_write_disk *a, int mode)
{
int r = ARCHIVE_OK;
mode &= 07777; /* Strip off file type bits. */
if (a->todo & TODO_SGID_CHECK) {
/*
* If we don't know the GID is right, we must stat()
* to verify it. We can't just check the GID of this
* process, since systems sometimes set GID from
* the enclosing dir or based on ACLs.
*/
if ((r = lazy_stat(a)) != ARCHIVE_OK)
return (r);
if (0 != a->gid) {
mode &= ~ S_ISGID;
}
/* While we're here, double-check the UID. */
if (0 != a->uid
&& (a->todo & TODO_SUID)) {
mode &= ~ S_ISUID;
}
a->todo &= ~TODO_SGID_CHECK;
a->todo &= ~TODO_SUID_CHECK;
} else if (a->todo & TODO_SUID_CHECK) {
/*
* If we don't know the UID is right, we can just check
* the user, since all systems set the file UID from
* the process UID.
*/
if (a->user_uid != a->uid) {
mode &= ~ S_ISUID;
}
a->todo &= ~TODO_SUID_CHECK;
}
if (S_ISLNK(a->mode)) {
#ifdef HAVE_LCHMOD
/*
* If this is a symlink, use lchmod(). If the
* platform doesn't support lchmod(), just skip it. A
* platform that doesn't provide a way to set
* permissions on symlinks probably ignores
* permissions on symlinks, so a failure here has no
* impact.
*/
if (lchmod(a->name, mode) != 0) {
archive_set_error(&a->archive, errno,
"Can't set permissions to 0%o", (int)mode);
r = ARCHIVE_WARN;
}
#endif
} else if (!S_ISDIR(a->mode)) {
/*
* If it's not a symlink and not a dir, then use
* fchmod() or chmod(), depending on whether we have
* an fd. Dirs get their perms set during the
* post-extract fixup, which is handled elsewhere.
*/
#ifdef HAVE_FCHMOD
if (a->fd >= 0) {
if (fchmod(a->fd, mode) != 0) {
archive_set_error(&a->archive, errno,
"Can't set permissions to 0%o", (int)mode);
r = ARCHIVE_WARN;
}
} else
#endif
/* If this platform lacks fchmod(), then
* we'll just use chmod(). */
if (la_chmod(a->name, mode) != 0) {
archive_set_error(&a->archive, errno,
"Can't set permissions to 0%o", (int)mode);
r = ARCHIVE_WARN;
}
}
return (r);
}
static int set_fflags_platform(const wchar_t *name, unsigned long fflags_set,
unsigned long fflags_clear)
{
DWORD oldflags, newflags;
wchar_t *fullname;
const DWORD settable_flags =
FILE_ATTRIBUTE_ARCHIVE |
FILE_ATTRIBUTE_HIDDEN |
FILE_ATTRIBUTE_NORMAL |
FILE_ATTRIBUTE_NOT_CONTENT_INDEXED |
FILE_ATTRIBUTE_OFFLINE |
FILE_ATTRIBUTE_READONLY |
FILE_ATTRIBUTE_SYSTEM |
FILE_ATTRIBUTE_TEMPORARY;
oldflags = GetFileAttributesW(name);
if (oldflags == (DWORD)-1 &&
GetLastError() == ERROR_INVALID_NAME) {
fullname = __la_win_permissive_name_w(name);
oldflags = GetFileAttributesW(fullname);
}
if (oldflags == (DWORD)-1) {
la_dosmaperr(GetLastError());
return (ARCHIVE_WARN);
}
newflags = ((oldflags & ~fflags_clear) | fflags_set) & settable_flags;
if(SetFileAttributesW(name, newflags) == 0)
return (ARCHIVE_WARN);
return (ARCHIVE_OK);
}
static int
clear_nochange_fflags(struct archive_write_disk *a)
{
return (set_fflags_platform(a->name, 0, FILE_ATTRIBUTE_READONLY));
}
static int
set_fflags(struct archive_write_disk *a)
{
unsigned long set, clear;
if (a->todo & TODO_FFLAGS) {
archive_entry_fflags(a->entry, &set, &clear);
if (set == 0 && clear == 0)
return (ARCHIVE_OK);
return (set_fflags_platform(a->name, set, clear));
}
return (ARCHIVE_OK);
}
/* Default empty function body to satisfy mainline code. */
static int
set_acls(struct archive_write_disk *a, HANDLE h, const wchar_t *name,
struct archive_acl *acl)
{
(void)a; /* UNUSED */
(void)h; /* UNUSED */
(void)name; /* UNUSED */
(void)acl; /* UNUSED */
return (ARCHIVE_OK);
}
/*
* Restore extended attributes - stub implementation for unsupported systems
*/
static int
set_xattrs(struct archive_write_disk *a)
{
static int warning_done = 0;
/* If there aren't any extended attributes, then it's okay not
* to extract them, otherwise, issue a single warning. */
if (archive_entry_xattr_count(a->entry) != 0 && !warning_done) {
warning_done = 1;
archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
"Cannot restore extended attributes on this system");
return (ARCHIVE_WARN);
}
/* Warning was already emitted; suppress further warnings. */
return (ARCHIVE_OK);
}
static void
fileTimeToUtc(const FILETIME *filetime, time_t *t, long *ns)
{
ULARGE_INTEGER utc;
utc.HighPart = filetime->dwHighDateTime;
utc.LowPart = filetime->dwLowDateTime;
if (utc.QuadPart >= EPOC_TIME) {
utc.QuadPart -= EPOC_TIME;
/* milli seconds base */
*t = (time_t)(utc.QuadPart / 10000000);
/* nano seconds base */
*ns = (long)(utc.QuadPart % 10000000) * 100;
} else {
*t = 0;
*ns = 0;
}
}
/*
* Test if file on disk is older than entry.
*/
static int
older(BY_HANDLE_FILE_INFORMATION *st, struct archive_entry *entry)
{
time_t sec;
long nsec;
fileTimeToUtc(&st->ftLastWriteTime, &sec, &nsec);
/* First, test the seconds and return if we have a definite answer. */
/* Definitely older. */
if (sec < archive_entry_mtime(entry))
return (1);
/* Definitely younger. */
if (sec > archive_entry_mtime(entry))
return (0);
if (nsec < archive_entry_mtime_nsec(entry))
return (1);
/* Same age or newer, so not older. */
return (0);
}
#endif /* _WIN32 && !__CYGWIN__ */
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