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freebsd-nq/lib/libarchive/archive_entry.c
Tim Kientzle 236d2801ad Support extracting entries with pathnames longer than PATH_MAX. In 
testing, I've archived and restored dir trees with ~1MB pathnames.
Most formats, of course, have much smaller limits.
2005-03-13 02:53:42 +00:00

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/*-
* Copyright (c) 2003-2004 Tim Kientzle
* 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("$FreeBSD$");
#include <sys/stat.h>
#include <sys/types.h>
#ifdef HAVE_EXT2FS_EXT2_FS_H
#include <ext2fs/ext2_fs.h> /* for Linux file flags */
#endif
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
#include "archive.h"
#include "archive_entry.h"
#undef max
#define max(a, b) ((a)>(b)?(a):(b))
/*
* Handle wide character (i.e., Unicode) and non-wide character
* strings transparently.
*
*/
struct aes {
const char *aes_mbs;
char *aes_mbs_alloc;
const wchar_t *aes_wcs;
wchar_t *aes_wcs_alloc;
};
struct ae_acl {
struct ae_acl *next;
int type; /* E.g., access or default */
int tag; /* E.g., user/group/other/mask */
int permset; /* r/w/x bits */
int id; /* uid/gid for user/group */
struct aes name; /* uname/gname */
};
static void aes_clean(struct aes *);
static void aes_copy(struct aes *dest, struct aes *src);
static const char * aes_get_mbs(struct aes *);
static const wchar_t * aes_get_wcs(struct aes *);
static void aes_set_mbs(struct aes *, const char *mbs);
static void aes_copy_mbs(struct aes *, const char *mbs);
/* static void aes_set_wcs(struct aes *, const wchar_t *wcs); */
static void aes_copy_wcs(struct aes *, const wchar_t *wcs);
static char * ae_fflagstostr(unsigned long bitset, unsigned long bitclear);
static const wchar_t *ae_wcstofflags(const wchar_t *stringp,
unsigned long *setp, unsigned long *clrp);
static void append_entry_w(wchar_t **wp, const wchar_t *prefix, int tag,
const wchar_t *wname, int perm, int id);
static void append_id_w(wchar_t **wp, int id);
static int acl_special(struct archive_entry *entry,
int type, int permset, int tag);
static struct ae_acl *acl_new_entry(struct archive_entry *entry,
int type, int permset, int tag, int id);
static void next_field_w(const wchar_t **wp, const wchar_t **start,
const wchar_t **end, wchar_t *sep);
static int prefix_w(const wchar_t *start, const wchar_t *end,
const wchar_t *test);
/*
* Description of an archive entry.
*
* Basically, this is a "struct stat" with a few text fields added in.
*
* TODO: Add "comment", "charset", and possibly other entries
* that are supported by "pax interchange" format. However, GNU, ustar,
* cpio, and other variants don't support these features, so they're not an
* excruciatingly high priority right now.
*
* TODO: "pax interchange" format allows essentially arbitrary
* key/value attributes to be attached to any entry. Supporting
* such extensions may make this library useful for special
* applications (e.g., a package manager could attach special
* package-management attributes to each entry). There are tricky
* API issues involved, so this is not going to happen until
* there's a real demand for it.
*
* TODO: Design a good API for handling sparse files.
*/
struct archive_entry {
/*
* Note that ae_stat.st_mode & S_IFMT can be 0!
*
* This occurs when the actual file type of the object is not
* in the archive. For example, 'tar' archives store
* hardlinks without marking the type of the underlying
* object.
*/
struct stat ae_stat;
/*
* Use aes here so that we get transparent mbs<->wcs conversions.
*/
struct aes ae_fflags_text; /* Text fflags per fflagstostr(3) */
unsigned long ae_fflags_set; /* Bitmap fflags */
unsigned long ae_fflags_clear;
struct aes ae_gname; /* Name of owning group */
struct aes ae_hardlink; /* Name of target for hardlink */
struct aes ae_pathname; /* Name of entry */
struct aes ae_symlink; /* symlink contents */
struct aes ae_uname; /* Name of owner */
struct ae_acl *acl_head;
struct ae_acl *acl_p;
int acl_state; /* See acl_next for details. */
wchar_t *acl_text_w;
};
static void
aes_clean(struct aes *aes)
{
if (aes->aes_mbs_alloc) {
free(aes->aes_mbs_alloc);
aes->aes_mbs_alloc = NULL;
}
if (aes->aes_wcs_alloc) {
free(aes->aes_wcs_alloc);
aes->aes_wcs_alloc = NULL;
}
memset(aes, 0, sizeof(*aes));
}
static void
aes_copy(struct aes *dest, struct aes *src)
{
*dest = *src;
if (src->aes_mbs != NULL) {
dest->aes_mbs_alloc = strdup(src->aes_mbs);
dest->aes_mbs = dest->aes_mbs_alloc;
}
if (src->aes_wcs != NULL) {
dest->aes_wcs_alloc = malloc((wcslen(src->aes_wcs) + 1)
* sizeof(wchar_t));
dest->aes_wcs = dest->aes_wcs_alloc;
wcscpy(dest->aes_wcs_alloc, src->aes_wcs);
}
}
static const char *
aes_get_mbs(struct aes *aes)
{
if (aes->aes_mbs == NULL && aes->aes_wcs != NULL) {
/*
* XXX Need to estimate the number of byte in the
* multi-byte form. Assume that, on average, wcs
* chars encode to no more than 3 bytes. There must
* be a better way... XXX
*/
int mbs_length = wcslen(aes->aes_wcs) * 3 + 64;
aes->aes_mbs_alloc = malloc(mbs_length);
aes->aes_mbs = aes->aes_mbs_alloc;
wcstombs(aes->aes_mbs_alloc, aes->aes_wcs, mbs_length - 1);
aes->aes_mbs_alloc[mbs_length - 1] = 0;
}
return (aes->aes_mbs);
}
static const wchar_t *
aes_get_wcs(struct aes *aes)
{
if (aes->aes_wcs == NULL && aes->aes_mbs != NULL) {
/*
* No single byte will be more than one wide character,
* so this length estimate will always be big enough.
*/
int wcs_length = strlen(aes->aes_mbs);
aes->aes_wcs_alloc
= malloc((wcs_length + 1) * sizeof(wchar_t));
aes->aes_wcs = aes->aes_wcs_alloc;
mbstowcs(aes->aes_wcs_alloc, aes->aes_mbs, wcs_length);
aes->aes_wcs_alloc[wcs_length] = 0;
}
return (aes->aes_wcs);
}
static void
aes_set_mbs(struct aes *aes, const char *mbs)
{
if (aes->aes_mbs_alloc) {
free(aes->aes_mbs_alloc);
aes->aes_mbs_alloc = NULL;
}
if (aes->aes_wcs_alloc) {
free(aes->aes_wcs_alloc);
aes->aes_wcs_alloc = NULL;
}
aes->aes_mbs = mbs;
aes->aes_wcs = NULL;
}
static void
aes_copy_mbs(struct aes *aes, const char *mbs)
{
if (aes->aes_mbs_alloc) {
free(aes->aes_mbs_alloc);
aes->aes_mbs_alloc = NULL;
}
if (aes->aes_wcs_alloc) {
free(aes->aes_wcs_alloc);
aes->aes_wcs_alloc = NULL;
}
aes->aes_mbs_alloc = malloc((strlen(mbs) + 1) * sizeof(char));
strcpy(aes->aes_mbs_alloc, mbs);
aes->aes_mbs = aes->aes_mbs_alloc;
aes->aes_wcs = NULL;
}
#if 0
static void
aes_set_wcs(struct aes *aes, const wchar_t *wcs)
{
if (aes->aes_mbs_alloc) {
free(aes->aes_mbs_alloc);
aes->aes_mbs_alloc = NULL;
}
if (aes->aes_wcs_alloc) {
free(aes->aes_wcs_alloc);
aes->aes_wcs_alloc = NULL;
}
aes->aes_mbs = NULL;
aes->aes_wcs = wcs;
}
#endif
static void
aes_copy_wcs(struct aes *aes, const wchar_t *wcs)
{
if (aes->aes_mbs_alloc) {
free(aes->aes_mbs_alloc);
aes->aes_mbs_alloc = NULL;
}
if (aes->aes_wcs_alloc) {
free(aes->aes_wcs_alloc);
aes->aes_wcs_alloc = NULL;
}
aes->aes_mbs = NULL;
aes->aes_wcs_alloc = malloc((wcslen(wcs) + 1) * sizeof(wchar_t));
wcscpy(aes->aes_wcs_alloc, wcs);
aes->aes_wcs = aes->aes_wcs_alloc;
}
struct archive_entry *
archive_entry_clear(struct archive_entry *entry)
{
aes_clean(&entry->ae_fflags_text);
aes_clean(&entry->ae_gname);
aes_clean(&entry->ae_hardlink);
aes_clean(&entry->ae_pathname);
aes_clean(&entry->ae_symlink);
aes_clean(&entry->ae_uname);
archive_entry_acl_clear(entry);
memset(entry, 0, sizeof(*entry));
return entry;
}
struct archive_entry *
archive_entry_clone(struct archive_entry *entry)
{
struct archive_entry *entry2;
/* Allocate new structure and copy over all of the fields. */
entry2 = malloc(sizeof(*entry2));
if(entry2 == NULL)
return (NULL);
memset(entry2, 0, sizeof(*entry2));
entry2->ae_stat = entry->ae_stat;
entry2->ae_fflags_set = entry->ae_fflags_set;
entry2->ae_fflags_clear = entry->ae_fflags_clear;
aes_copy(&entry2->ae_fflags_text, &entry->ae_fflags_text);
aes_copy(&entry2->ae_gname, &entry->ae_gname);
aes_copy(&entry2->ae_hardlink, &entry->ae_hardlink);
aes_copy(&entry2->ae_pathname, &entry->ae_pathname);
aes_copy(&entry2->ae_symlink, &entry->ae_symlink);
aes_copy(&entry2->ae_uname, &entry->ae_uname);
/* XXX TODO: Copy ACL data over as well. XXX */
return (entry2);
}
void
archive_entry_free(struct archive_entry *entry)
{
archive_entry_clear(entry);
free(entry);
}
struct archive_entry *
archive_entry_new(void)
{
struct archive_entry *entry;
entry = malloc(sizeof(*entry));
if(entry == NULL)
return (NULL);
memset(entry, 0, sizeof(*entry));
return (entry);
}
/*
* Functions for reading fields from an archive_entry.
*/
time_t
archive_entry_atime(struct archive_entry *entry)
{
return (entry->ae_stat.st_atime);
}
long
archive_entry_atime_nsec(struct archive_entry *entry)
{
(void)entry; /* entry can be unused here. */
return (ARCHIVE_STAT_ATIME_NANOS(&entry->ae_stat));
}
dev_t
archive_entry_dev(struct archive_entry *entry)
{
return (entry->ae_stat.st_dev);
}
void
archive_entry_fflags(struct archive_entry *entry,
unsigned long *set, unsigned long *clear)
{
*set = entry->ae_fflags_set;
*clear = entry->ae_fflags_clear;
}
/*
* Note: if text was provided, this just returns that text. If you
* really need the text to be rebuilt in a canonical form, set the
* text, ask for the bitmaps, then set the bitmaps. (Setting the
* bitmaps clears any stored text.) This design is deliberate: if
* we're editing archives, we don't want to discard flags just because
* they aren't supported on the current system. The bitmap<->text
* conversions are platform-specific (see below).
*/
const char *
archive_entry_fflags_text(struct archive_entry *entry)
{
const char *f;
char *p;
f = aes_get_mbs(&entry->ae_fflags_text);
if (f != NULL)
return (f);
if (entry->ae_fflags_set == 0 && entry->ae_fflags_clear == 0)
return (NULL);
p = ae_fflagstostr(entry->ae_fflags_set, entry->ae_fflags_clear);
if (p == NULL)
return (NULL);
aes_copy_mbs(&entry->ae_fflags_text, p);
free(p);
f = aes_get_mbs(&entry->ae_fflags_text);
return (f);
}
gid_t
archive_entry_gid(struct archive_entry *entry)
{
return (entry->ae_stat.st_gid);
}
const char *
archive_entry_gname(struct archive_entry *entry)
{
return (aes_get_mbs(&entry->ae_gname));
}
const char *
archive_entry_hardlink(struct archive_entry *entry)
{
return (aes_get_mbs(&entry->ae_hardlink));
}
ino_t
archive_entry_ino(struct archive_entry *entry)
{
return (entry->ae_stat.st_ino);
}
mode_t
archive_entry_mode(struct archive_entry *entry)
{
return (entry->ae_stat.st_mode);
}
time_t
archive_entry_mtime(struct archive_entry *entry)
{
return (entry->ae_stat.st_mtime);
}
long
archive_entry_mtime_nsec(struct archive_entry *entry)
{
(void)entry; /* entry can be unused here. */
return (ARCHIVE_STAT_MTIME_NANOS(&entry->ae_stat));
}
const char *
archive_entry_pathname(struct archive_entry *entry)
{
return (aes_get_mbs(&entry->ae_pathname));
}
const wchar_t *
archive_entry_pathname_w(struct archive_entry *entry)
{
return (aes_get_wcs(&entry->ae_pathname));
}
dev_t
archive_entry_rdev(struct archive_entry *entry)
{
return (entry->ae_stat.st_rdev);
}
dev_t
archive_entry_rdevmajor(struct archive_entry *entry)
{
return (major(entry->ae_stat.st_rdev));
}
dev_t
archive_entry_rdevminor(struct archive_entry *entry)
{
return (minor(entry->ae_stat.st_rdev));
}
int64_t
archive_entry_size(struct archive_entry *entry)
{
return (entry->ae_stat.st_size);
}
const struct stat *
archive_entry_stat(struct archive_entry *entry)
{
return (&entry->ae_stat);
}
const char *
archive_entry_symlink(struct archive_entry *entry)
{
return (aes_get_mbs(&entry->ae_symlink));
}
uid_t
archive_entry_uid(struct archive_entry *entry)
{
return (entry->ae_stat.st_uid);
}
const char *
archive_entry_uname(struct archive_entry *entry)
{
return (aes_get_mbs(&entry->ae_uname));
}
/*
* Functions to set archive_entry properties.
*/
/*
* Note "copy" not "set" here. The "set" functions that accept a pointer
* only store the pointer; they don't copy the underlying object.
*/
void
archive_entry_copy_stat(struct archive_entry *entry, const struct stat *st)
{
entry->ae_stat = *st;
}
void
archive_entry_set_fflags(struct archive_entry *entry,
unsigned long set, unsigned long clear)
{
aes_clean(&entry->ae_fflags_text);
entry->ae_fflags_set = set;
entry->ae_fflags_clear = clear;
}
const wchar_t *
archive_entry_copy_fflags_text_w(struct archive_entry *entry,
const wchar_t *flags)
{
aes_copy_wcs(&entry->ae_fflags_text, flags);
return (ae_wcstofflags(flags,
&entry->ae_fflags_set, &entry->ae_fflags_clear));
}
void
archive_entry_set_gid(struct archive_entry *entry, gid_t g)
{
entry->ae_stat.st_gid = g;
}
void
archive_entry_set_gname(struct archive_entry *entry, const char *name)
{
aes_set_mbs(&entry->ae_gname, name);
}
void
archive_entry_copy_gname_w(struct archive_entry *entry, const wchar_t *name)
{
aes_copy_wcs(&entry->ae_gname, name);
}
void
archive_entry_set_hardlink(struct archive_entry *entry, const char *target)
{
aes_set_mbs(&entry->ae_hardlink, target);
}
void
archive_entry_copy_hardlink(struct archive_entry *entry, const char *target)
{
aes_copy_mbs(&entry->ae_hardlink, target);
}
void
archive_entry_copy_hardlink_w(struct archive_entry *entry, const wchar_t *target)
{
aes_copy_wcs(&entry->ae_hardlink, target);
}
/* Set symlink if symlink is already set, else set hardlink. */
void
archive_entry_set_link(struct archive_entry *entry, const char *target)
{
if (entry->ae_symlink.aes_mbs != NULL ||
entry->ae_symlink.aes_wcs != NULL)
aes_set_mbs(&entry->ae_symlink, target);
aes_set_mbs(&entry->ae_hardlink, target);
}
void
archive_entry_set_mode(struct archive_entry *entry, mode_t m)
{
entry->ae_stat.st_mode = m;
}
void
archive_entry_set_mtime(struct archive_entry *entry, time_t m, long ns)
{
entry->ae_stat.st_mtime = m;
ARCHIVE_STAT_SET_MTIME_NANOS(&entry->ae_stat, ns);
}
void
archive_entry_set_pathname(struct archive_entry *entry, const char *name)
{
aes_set_mbs(&entry->ae_pathname, name);
}
void
archive_entry_copy_pathname(struct archive_entry *entry, const char *name)
{
aes_copy_mbs(&entry->ae_pathname, name);
}
void
archive_entry_copy_pathname_w(struct archive_entry *entry, const wchar_t *name)
{
aes_copy_wcs(&entry->ae_pathname, name);
}
void
archive_entry_set_rdevmajor(struct archive_entry *entry, dev_t m)
{
dev_t d;
d = entry->ae_stat.st_rdev;
entry->ae_stat.st_rdev = makedev(major(m), minor(d));
}
void
archive_entry_set_rdevminor(struct archive_entry *entry, dev_t m)
{
dev_t d;
d = entry->ae_stat.st_rdev;
entry->ae_stat.st_rdev = makedev(major(d), minor(m));
}
void
archive_entry_set_size(struct archive_entry *entry, int64_t s)
{
entry->ae_stat.st_size = s;
}
void
archive_entry_set_symlink(struct archive_entry *entry, const char *linkname)
{
aes_set_mbs(&entry->ae_symlink, linkname);
}
void
archive_entry_copy_symlink_w(struct archive_entry *entry, const wchar_t *linkname)
{
aes_copy_wcs(&entry->ae_symlink, linkname);
}
void
archive_entry_set_uid(struct archive_entry *entry, uid_t u)
{
entry->ae_stat.st_uid = u;
}
void
archive_entry_set_uname(struct archive_entry *entry, const char *name)
{
aes_set_mbs(&entry->ae_uname, name);
}
void
archive_entry_copy_uname_w(struct archive_entry *entry, const wchar_t *name)
{
aes_copy_wcs(&entry->ae_uname, name);
}
/*
* ACL management. The following would, of course, be a lot simpler
* if: 1) the last draft of POSIX.1e were a really thorough and
* complete standard that addressed the needs of ACL archiving and 2)
* everyone followed it faithfully. Alas, neither is true, so the
* following is a lot more complex than might seem necessary to the
* uninitiated.
*/
void
archive_entry_acl_clear(struct archive_entry *entry)
{
struct ae_acl *ap;
while (entry->acl_head != NULL) {
ap = entry->acl_head->next;
aes_clean(&entry->acl_head->name);
free(entry->acl_head);
entry->acl_head = ap;
}
if (entry->acl_text_w != NULL) {
free(entry->acl_text_w);
entry->acl_text_w = NULL;
}
entry->acl_p = NULL;
entry->acl_state = 0; /* Not counting. */
}
/*
* Add a single ACL entry to the internal list of ACL data.
*/
void
archive_entry_acl_add_entry(struct archive_entry *entry,
int type, int permset, int tag, int id, const char *name)
{
struct ae_acl *ap;
if (acl_special(entry, type, permset, tag) == 0)
return;
ap = acl_new_entry(entry, type, permset, tag, id);
if (ap == NULL) {
/* XXX Error XXX */
return;
}
if (name != NULL && *name != '\0')
aes_copy_mbs(&ap->name, name);
else
aes_clean(&ap->name);
}
/*
* As above, but with a wide-character name.
*/
void
archive_entry_acl_add_entry_w(struct archive_entry *entry,
int type, int permset, int tag, int id, const wchar_t *name)
{
struct ae_acl *ap;
if (acl_special(entry, type, permset, tag) == 0)
return;
ap = acl_new_entry(entry, type, permset, tag, id);
if (ap == NULL) {
/* XXX Error XXX */
return;
}
if (name != NULL && *name != L'\0')
aes_copy_wcs(&ap->name, name);
else
aes_clean(&ap->name);
}
/*
* If this ACL entry is part of the standard POSIX permissions set,
* store the permissions in the stat structure and return zero.
*/
static int
acl_special(struct archive_entry *entry, int type, int permset, int tag)
{
if (type == ARCHIVE_ENTRY_ACL_TYPE_ACCESS) {
switch (tag) {
case ARCHIVE_ENTRY_ACL_USER_OBJ:
entry->ae_stat.st_mode &= ~0700;
entry->ae_stat.st_mode |= (permset & 7) << 6;
return (0);
case ARCHIVE_ENTRY_ACL_GROUP_OBJ:
entry->ae_stat.st_mode &= ~0070;
entry->ae_stat.st_mode |= (permset & 7) << 3;
return (0);
case ARCHIVE_ENTRY_ACL_OTHER:
entry->ae_stat.st_mode &= ~0007;
entry->ae_stat.st_mode |= permset & 7;
return (0);
}
}
return (1);
}
/*
* Allocate and populate a new ACL entry with everything but the
* name.
*/
static struct ae_acl *
acl_new_entry(struct archive_entry *entry,
int type, int permset, int tag, int id)
{
struct ae_acl *ap;
if (type != ARCHIVE_ENTRY_ACL_TYPE_ACCESS &&
type != ARCHIVE_ENTRY_ACL_TYPE_DEFAULT)
return (NULL);
if (entry->acl_text_w != NULL) {
free(entry->acl_text_w);
entry->acl_text_w = NULL;
}
/* XXX TODO: More sanity-checks on the arguments XXX */
/* If there's a matching entry already in the list, overwrite it. */
for (ap = entry->acl_head; ap != NULL; ap = ap->next) {
if (ap->type == type && ap->tag == tag && ap->id == id) {
ap->permset = permset;
return (ap);
}
}
/* Add a new entry to the list. */
ap = malloc(sizeof(*ap));
memset(ap, 0, sizeof(*ap));
ap->next = entry->acl_head;
entry->acl_head = ap;
ap->type = type;
ap->tag = tag;
ap->id = id;
ap->permset = permset;
return (ap);
}
/*
* Return a count of entries matching "want_type".
*/
int
archive_entry_acl_count(struct archive_entry *entry, int want_type)
{
int count;
struct ae_acl *ap;
count = 0;
ap = entry->acl_head;
while (ap != NULL) {
if ((ap->type & want_type) != 0)
count++;
ap = ap->next;
}
if (count > 0 && ((want_type & ARCHIVE_ENTRY_ACL_TYPE_ACCESS) != 0))
count += 3;
return (count);
}
/*
* Prepare for reading entries from the ACL data. Returns a count
* of entries matching "want_type", or zero if there are no
* non-extended ACL entries of that type.
*/
int
archive_entry_acl_reset(struct archive_entry *entry, int want_type)
{
int count, cutoff;
count = archive_entry_acl_count(entry, want_type);
/*
* If the only entries are the three standard ones,
* then don't return any ACL data. (In this case,
* client can just use chmod(2) to set permissions.)
*/
if ((want_type & ARCHIVE_ENTRY_ACL_TYPE_ACCESS) != 0)
cutoff = 3;
else
cutoff = 0;
if (count > cutoff)
entry->acl_state = ARCHIVE_ENTRY_ACL_USER_OBJ;
else
entry->acl_state = 0;
entry->acl_p = entry->acl_head;
return (count);
}
/*
* Return the next ACL entry in the list. Fake entries for the
* standard permissions and include them in the returned list.
*/
int
archive_entry_acl_next(struct archive_entry *entry, int want_type, int *type,
int *permset, int *tag, int *id, const char **name)
{
*name = NULL;
*id = -1;
/*
* The acl_state is either zero (no entries available), -1
* (reading from list), or an entry type (retrieve that type
* from ae_stat.st_mode).
*/
if (entry->acl_state == 0)
return (ARCHIVE_WARN);
/* The first three access entries are special. */
if ((want_type & ARCHIVE_ENTRY_ACL_TYPE_ACCESS) != 0) {
switch (entry->acl_state) {
case ARCHIVE_ENTRY_ACL_USER_OBJ:
*permset = (entry->ae_stat.st_mode >> 6) & 7;
*type = ARCHIVE_ENTRY_ACL_TYPE_ACCESS;
*tag = ARCHIVE_ENTRY_ACL_USER_OBJ;
entry->acl_state = ARCHIVE_ENTRY_ACL_GROUP_OBJ;
return (ARCHIVE_OK);
case ARCHIVE_ENTRY_ACL_GROUP_OBJ:
*permset = (entry->ae_stat.st_mode >> 3) & 7;
*type = ARCHIVE_ENTRY_ACL_TYPE_ACCESS;
*tag = ARCHIVE_ENTRY_ACL_GROUP_OBJ;
entry->acl_state = ARCHIVE_ENTRY_ACL_OTHER;
return (ARCHIVE_OK);
case ARCHIVE_ENTRY_ACL_OTHER:
*permset = entry->ae_stat.st_mode & 7;
*type = ARCHIVE_ENTRY_ACL_TYPE_ACCESS;
*tag = ARCHIVE_ENTRY_ACL_OTHER;
entry->acl_state = -1;
entry->acl_p = entry->acl_head;
return (ARCHIVE_OK);
default:
break;
}
}
while (entry->acl_p != NULL && (entry->acl_p->type & want_type) == 0)
entry->acl_p = entry->acl_p->next;
if (entry->acl_p == NULL) {
entry->acl_state = 0;
return (ARCHIVE_WARN);
}
*type = entry->acl_p->type;
*permset = entry->acl_p->permset;
*tag = entry->acl_p->tag;
*id = entry->acl_p->id;
*name = aes_get_mbs(&entry->acl_p->name);
entry->acl_p = entry->acl_p->next;
return (ARCHIVE_OK);
}
/*
* Generate a text version of the ACL. The flags parameter controls
* the style of the generated ACL.
*/
const wchar_t *
archive_entry_acl_text_w(struct archive_entry *entry, int flags)
{
int count;
int length;
const wchar_t *wname;
const wchar_t *prefix;
wchar_t separator;
struct ae_acl *ap;
int id;
wchar_t *wp;
if (entry->acl_text_w != NULL) {
free (entry->acl_text_w);
entry->acl_text_w = NULL;
}
separator = L',';
count = 0;
length = 0;
ap = entry->acl_head;
while (ap != NULL) {
if ((ap->type & flags) != 0) {
count++;
if ((flags & ARCHIVE_ENTRY_ACL_STYLE_MARK_DEFAULT) &&
(ap->type & ARCHIVE_ENTRY_ACL_TYPE_DEFAULT))
length += 8; /* "default:" */
length += 5; /* tag name */
length += 1; /* colon */
wname = aes_get_wcs(&ap->name);
if (wname != NULL)
length += wcslen(wname);
length ++; /* colon */
length += 3; /* rwx */
length += 1; /* colon */
length += max(sizeof(uid_t),sizeof(gid_t)) * 3 + 1;
length ++; /* newline */
}
ap = ap->next;
}
if (count > 0 && ((flags & ARCHIVE_ENTRY_ACL_TYPE_ACCESS) != 0)) {
length += 10; /* "user::rwx\n" */
length += 11; /* "group::rwx\n" */
length += 11; /* "other::rwx\n" */
}
if (count == 0)
return (NULL);
/* Now, allocate the string and actually populate it. */
wp = entry->acl_text_w = malloc(length * sizeof(wchar_t));
count = 0;
if ((flags & ARCHIVE_ENTRY_ACL_TYPE_ACCESS) != 0) {
append_entry_w(&wp, NULL, ARCHIVE_ENTRY_ACL_USER_OBJ, NULL,
entry->ae_stat.st_mode & 0700, -1);
*wp++ = ',';
append_entry_w(&wp, NULL, ARCHIVE_ENTRY_ACL_GROUP_OBJ, NULL,
entry->ae_stat.st_mode & 0070, -1);
*wp++ = ',';
append_entry_w(&wp, NULL, ARCHIVE_ENTRY_ACL_OTHER, NULL,
entry->ae_stat.st_mode & 0007, -1);
count += 3;
ap = entry->acl_head;
while (ap != NULL) {
if ((ap->type & ARCHIVE_ENTRY_ACL_TYPE_ACCESS) != 0) {
wname = aes_get_wcs(&ap->name);
*wp++ = separator;
if (flags & ARCHIVE_ENTRY_ACL_STYLE_EXTRA_ID)
id = ap->id;
else
id = -1;
append_entry_w(&wp, NULL, ap->tag, wname,
ap->permset, id);
count++;
}
ap = ap->next;
}
}
if ((flags & ARCHIVE_ENTRY_ACL_TYPE_DEFAULT) != 0) {
if (flags & ARCHIVE_ENTRY_ACL_STYLE_MARK_DEFAULT)
prefix = L"default:";
else
prefix = NULL;
ap = entry->acl_head;
count = 0;
while (ap != NULL) {
if ((ap->type & ARCHIVE_ENTRY_ACL_TYPE_DEFAULT) != 0) {
wname = aes_get_wcs(&ap->name);
if (count > 0)
*wp++ = separator;
if (flags & ARCHIVE_ENTRY_ACL_STYLE_EXTRA_ID)
id = ap->id;
else
id = -1;
append_entry_w(&wp, prefix, ap->tag,
wname, ap->permset, id);
count ++;
}
ap = ap->next;
}
}
return (entry->acl_text_w);
}
static void
append_id_w(wchar_t **wp, int id)
{
if (id > 9)
append_id_w(wp, id / 10);
*(*wp)++ = L"0123456789"[id % 10];
}
static void
append_entry_w(wchar_t **wp, const wchar_t *prefix, int tag,
const wchar_t *wname, int perm, int id)
{
if (prefix != NULL) {
wcscpy(*wp, prefix);
*wp += wcslen(*wp);
}
switch (tag) {
case ARCHIVE_ENTRY_ACL_USER_OBJ:
wname = NULL;
id = -1;
/* FALL THROUGH */
case ARCHIVE_ENTRY_ACL_USER:
wcscpy(*wp, L"user");
break;
case ARCHIVE_ENTRY_ACL_GROUP_OBJ:
wname = NULL;
id = -1;
/* FALL THROUGH */
case ARCHIVE_ENTRY_ACL_GROUP:
wcscpy(*wp, L"group");
break;
case ARCHIVE_ENTRY_ACL_MASK:
wcscpy(*wp, L"mask");
wname = NULL;
id = -1;
break;
case ARCHIVE_ENTRY_ACL_OTHER:
wcscpy(*wp, L"other");
wname = NULL;
id = -1;
break;
}
*wp += wcslen(*wp);
*(*wp)++ = L':';
if (wname != NULL) {
wcscpy(*wp, wname);
*wp += wcslen(*wp);
}
*(*wp)++ = L':';
*(*wp)++ = (perm & 0444) ? L'r' : L'-';
*(*wp)++ = (perm & 0222) ? L'w' : L'-';
*(*wp)++ = (perm & 0111) ? L'x' : L'-';
if (id != -1) {
*(*wp)++ = L':';
append_id_w(wp, id);
}
**wp = L'\0';
}
/*
* Parse a textual ACL. This automatically recognizes and supports
* extensions described above. The 'type' argument is used to
* indicate the type that should be used for any entries not
* explicitly marked as "default:".
*/
int
__archive_entry_acl_parse_w(struct archive_entry *entry,
const wchar_t *text, int default_type)
{
int type, tag, permset, id;
const wchar_t *start, *end;
const wchar_t *name_start, *name_end;
wchar_t sep;
wchar_t *namebuff;
int namebuff_length;
name_start = name_end = NULL;
namebuff = NULL;
namebuff_length = 0;
while (text != NULL && *text != L'\0') {
next_field_w(&text, &start, &end, &sep);
if (sep != L':')
goto fail;
/*
* Solaris extension: "defaultuser::rwx" is the
* default ACL corresponding to "user::rwx", etc.
*/
if (end-start > 7 && wmemcmp(start, L"default", 7) == 0) {
type = ARCHIVE_ENTRY_ACL_TYPE_DEFAULT;
start += 7;
} else
type = default_type;
if (prefix_w(start, end, L"user")) {
next_field_w(&text, &start, &end, &sep);
if (sep != L':')
goto fail;
if (end > start) {
tag = ARCHIVE_ENTRY_ACL_USER;
name_start = start;
name_end = end;
} else
tag = ARCHIVE_ENTRY_ACL_USER_OBJ;
} else if (prefix_w(start, end, L"group")) {
next_field_w(&text, &start, &end, &sep);
if (sep != L':')
goto fail;
if (end > start) {
tag = ARCHIVE_ENTRY_ACL_GROUP;
name_start = start;
name_end = end;
} else
tag = ARCHIVE_ENTRY_ACL_GROUP_OBJ;
} else if (prefix_w(start, end, L"other")) {
next_field_w(&text, &start, &end, &sep);
if (sep != L':')
goto fail;
if (end > start)
goto fail;
tag = ARCHIVE_ENTRY_ACL_OTHER;
} else if (prefix_w(start, end, L"mask")) {
next_field_w(&text, &start, &end, &sep);
if (sep != L':')
goto fail;
if (end > start)
goto fail;
tag = ARCHIVE_ENTRY_ACL_MASK;
} else
goto fail;
next_field_w(&text, &start, &end, &sep);
permset = 0;
while (start < end) {
switch (*start++) {
case 'r': case 'R':
permset |= ARCHIVE_ENTRY_ACL_READ;
break;
case 'w': case 'W':
permset |= ARCHIVE_ENTRY_ACL_WRITE;
break;
case 'x': case 'X':
permset |= ARCHIVE_ENTRY_ACL_EXECUTE;
break;
case '-':
break;
default:
goto fail;
}
}
/*
* Support star-compatible numeric UID/GID extension.
* This extension adds a ":" followed by the numeric
* ID so that "group:groupname:rwx", for example,
* becomes "group:groupname:rwx:999", where 999 is the
* numeric GID. This extension makes it possible, for
* example, to correctly restore ACLs on a system that
* might have a damaged passwd file or be disconnected
* from a central NIS server. This extension is compatible
* with POSIX.1e draft 17.
*/
if (sep == L':' && (tag == ARCHIVE_ENTRY_ACL_USER ||
tag == ARCHIVE_ENTRY_ACL_GROUP)) {
next_field_w(&text, &start, &end, &sep);
id = 0;
while (start < end && *start >= '0' && *start <= '9') {
if (id > (INT_MAX / 10))
id = INT_MAX;
else {
id *= 10;
id += *start - '0';
start++;
}
}
} else
id = -1; /* No id specified. */
/* Skip any additional entries. */
while (sep == L':') {
next_field_w(&text, &start, &end, &sep);
}
/* Add entry to the internal list. */
if (name_end == name_start) {
archive_entry_acl_add_entry_w(entry, type, permset,
tag, id, NULL);
} else {
if (namebuff_length <= name_end - name_start) {
if (namebuff != NULL)
free(namebuff);
namebuff_length = name_end - name_start + 256;
namebuff =
malloc(namebuff_length * sizeof(wchar_t));
}
wmemcpy(namebuff, name_start, name_end - name_start);
namebuff[name_end - name_start] = L'\0';
archive_entry_acl_add_entry_w(entry, type,
permset, tag, id, namebuff);
}
}
if (namebuff != NULL)
free(namebuff);
return (ARCHIVE_OK);
fail:
if (namebuff != NULL)
free(namebuff);
return (ARCHIVE_WARN);
}
/*
* Match "[:whitespace:]*(.*)[:whitespace:]*[:,\n]". *wp is updated
* to point to just after the separator. *start points to the first
* character of the matched text and *end just after the last
* character of the matched identifier. In particular *end - *start
* is the length of the field body, not including leading or trailing
* whitespace.
*/
static void
next_field_w(const wchar_t **wp, const wchar_t **start,
const wchar_t **end, wchar_t *sep)
{
/* Skip leading whitespace to find start of field. */
while (**wp == L' ' || **wp == L'\t' || **wp == L'\n') {
(*wp)++;
}
*start = *wp;
/* Scan for the separator. */
while (**wp != L'\0' && **wp != L',' && **wp != L':' &&
**wp != L'\n') {
(*wp)++;
}
*sep = **wp;
/* Trim trailing whitespace to locate end of field. */
*end = *wp - 1;
while (**end == L' ' || **end == L'\t' || **end == L'\n') {
(*end)--;
}
(*end)++;
/* Adjust scanner location. */
if (**wp != L'\0')
(*wp)++;
}
static int
prefix_w(const wchar_t *start, const wchar_t *end, const wchar_t *test)
{
if (start == end)
return (0);
if (*start++ != *test++)
return (0);
while (start < end && *start++ == *test++)
;
if (start < end)
return (0);
return (1);
}
/*
* Following code is modified from UC Berkeley sources, and
* is subject to the following copyright notice.
*/
/*-
* Copyright (c) 1993
* The Regents of the University of California. 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.
* 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.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
*/
static struct flag {
const char *name;
const wchar_t *wname;
unsigned long set;
unsigned long clear;
} flags[] = {
/* Preferred (shorter) names per flag first, all prefixed by "no" */
#ifdef SF_APPEND
{ "nosappnd", L"nosappnd", SF_APPEND, 0 },
{ "nosappend", L"nosappend", SF_APPEND, 0 },
#endif
#ifdef EXT2_APPEND_FL /* 'a' */
{ "nosappnd", L"nosappnd", EXT2_APPEND_FL, 0 },
{ "nosappend", L"nosappend", EXT2_APPEND_FL, 0 },
#endif
#ifdef SF_ARCHIVED
{ "noarch", L"noarch", SF_ARCHIVED, 0 },
{ "noarchived", L"noarchived", SF_ARCHIVED, 0 },
#endif
#ifdef SF_IMMUTABLE
{ "noschg", L"noschg", SF_IMMUTABLE, 0 },
{ "noschange", L"noschange", SF_IMMUTABLE, 0 },
{ "nosimmutable", L"nosimmutable", SF_IMMUTABLE, 0 },
#endif
#ifdef EXT2_IMMUTABLE_FL /* 'i' */
{ "noschg", L"noschg", EXT2_IMMUTABLE_FL, 0 },
{ "noschange", L"noschange", EXT2_IMMUTABLE_FL, 0 },
{ "nosimmutable", L"nosimmutable", EXT2_IMMUTABLE_FL, 0 },
#endif
#ifdef SF_NOUNLINK
{ "nosunlnk", L"nosunlnk", SF_NOUNLINK, 0 },
{ "nosunlink", L"nosunlink", SF_NOUNLINK, 0 },
#endif
#ifdef SF_SNAPSHOT
{ "nosnapshot", L"nosnapshot", SF_SNAPSHOT, 0 },
#endif
#ifdef UF_APPEND
{ "nouappnd", L"nouappnd", UF_APPEND, 0 },
{ "nouappend", L"nouappend", UF_APPEND, 0 },
#endif
#ifdef UF_IMMUTABLE
{ "nouchg", L"nouchg", UF_IMMUTABLE, 0 },
{ "nouchange", L"nouchange", UF_IMMUTABLE, 0 },
{ "nouimmutable", L"nouimmutable", UF_IMMUTABLE, 0 },
#endif
#ifdef UF_NODUMP
{ "nodump", L"nodump", 0, UF_NODUMP},
#endif
#ifdef EXT2_NODUMP_FL /* 'd' */
{ "nodump", L"nodump", 0, EXT2_NODUMP_FL},
#endif
#ifdef UF_OPAQUE
{ "noopaque", L"noopaque", UF_OPAQUE, 0 },
#endif
#ifdef UF_NOUNLINK
{ "nouunlnk", L"nouunlnk", UF_NOUNLINK, 0 },
{ "nouunlink", L"nouunlink", UF_NOUNLINK, 0 },
#endif
#ifdef EXT2_COMPR_FL /* 'c' */
{ "nocompress", L"nocompress", EXT2_COMPR_FL, 0 },
#endif
#ifdef EXT2_NOATIME_FL /* 'A' */
{ "noatime", L"noatime", 0, EXT2_NOATIME_FL},
#endif
{ NULL, NULL, 0, 0 }
};
/*
* fflagstostr --
* Convert file flags to a comma-separated string. If no flags
* are set, return the empty string.
*/
char *
ae_fflagstostr(unsigned long bitset, unsigned long bitclear)
{
char *string, *dp;
const char *sp;
unsigned long bits;
struct flag *flag;
int length;
bits = bitset | bitclear;
length = 0;
for (flag = flags; flag->name != NULL; flag++)
if (bits & (flag->set | flag->clear)) {
length += strlen(flag->name) + 1;
bits &= ~(flag->set | flag->clear);
}
if (length == 0)
return (NULL);
string = malloc(length);
if (string == NULL)
return (NULL);
dp = string;
for (flag = flags; flag->name != NULL; flag++) {
if (bitset & flag->set || bitclear & flag->clear) {
sp = flag->name + 2;
} else if (bitset & flag->clear || bitclear & flag->set) {
sp = flag->name;
} else
continue;
bitset &= ~(flag->set | flag->clear);
bitclear &= ~(flag->set | flag->clear);
if (dp > string)
*dp++ = ',';
while ((*dp++ = *sp++) != '\0')
;
dp--;
}
*dp = '\0';
return (string);
}
/*
* wcstofflags --
* Take string of arguments and return file flags. This
* version works a little differently than strtofflags(3).
* In particular, it always tests every token, skipping any
* unrecognized tokens. It returns a pointer to the first
* unrecognized token, or NULL if every token was recognized.
* This version is also const-correct and does not modify the
* provided string.
*/
const wchar_t *
ae_wcstofflags(const wchar_t *s, unsigned long *setp, unsigned long *clrp)
{
const wchar_t *start, *end;
struct flag *flag;
unsigned long set, clear;
const wchar_t *failed;
set = clear = 0;
start = s;
failed = NULL;
/* Find start of first token. */
while (*start == L'\t' || *start == L' ' || *start == L',')
start++;
while (*start != L'\0') {
/* Locate end of token. */
end = start;
while (*end != L'\0' && *end != L'\t' &&
*end != L' ' && *end != L',')
end++;
for (flag = flags; flag->wname != NULL; flag++) {
if (wmemcmp(start, flag->wname, end - start) == 0) {
/* Matched "noXXXX", so reverse the sense. */
clear |= flag->set;
set |= flag->clear;
break;
} else if (wmemcmp(start, flag->wname + 2, end - start)
== 0) {
/* Matched "XXXX", so don't reverse. */
set |= flag->set;
clear |= flag->clear;
break;
}
}
/* Ignore unknown flag names. */
if (flag->wname == NULL && failed == NULL)
failed = start;
/* Find start of next token. */
start = end;
while (*start == L'\t' || *start == L' ' || *start == L',')
start++;
}
if (setp)
*setp = set;
if (clrp)
*clrp = clear;
/* Return location of first failure. */
return (failed);
}
#ifdef TEST
#include <stdio.h>
int
main(int argc, char **argv)
{
struct archive_entry *entry = archive_entry_new();
unsigned long set, clear;
const wchar_t *remainder;
remainder = archive_entry_copy_fflags_text_w(entry, L"nosappnd dump archive,,,,,,,");
archive_entry_fflags(entry, &set, &clear);
wprintf(L"set=0x%lX clear=0x%lX remainder='%ls'\n", set, clear, remainder);
wprintf(L"new flags='%s'\n", archive_entry_fflags_text(entry));
return (0);
}
#endif
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