mirror of https://github.com/MidnightCommander/mc
578 lines
15 KiB
C
578 lines
15 KiB
C
/* Virtual File System: GNU Tar file system.
|
|
Copyright (C) 1995 The Free Software Foundation
|
|
|
|
Written by: 1995 Jakub Jelinek
|
|
Rewritten by: 1998 Pavel Machek
|
|
|
|
This program is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Library General Public License
|
|
as published by the Free Software Foundation; either version 2 of
|
|
the License, or (at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
License along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
|
|
|
|
/* Namespace: vfs_tarfs_ops */
|
|
|
|
#include "xdirentry.h"
|
|
#include <errno.h>
|
|
#ifdef SCO_FLAVOR
|
|
#include <sys/timeb.h> /* alex: for struct timeb definition */
|
|
#endif /* SCO_FLAVOR */
|
|
#include <time.h>
|
|
|
|
#include "utilvfs.h"
|
|
|
|
#include "../src/dialog.h" /* For MSG_ERROR */
|
|
#include "tar.h"
|
|
#include "names.h"
|
|
|
|
#define isodigit(c) ( ((c) >= '0') && ((c) <= '7') )
|
|
/*
|
|
* Quick and dirty octal conversion.
|
|
*
|
|
* Result is -1 if the field is invalid (all blank, or nonoctal).
|
|
*/
|
|
static long from_oct (int digs, char *where)
|
|
{
|
|
register long value;
|
|
|
|
while (isspace (*where)) { /* Skip spaces */
|
|
where++;
|
|
if (--digs <= 0)
|
|
return -1; /* All blank field */
|
|
}
|
|
value = 0;
|
|
while (digs > 0 && isodigit (*where)) { /* Scan till nonoctal */
|
|
value = (value << 3) | (*where++ - '0');
|
|
--digs;
|
|
}
|
|
|
|
if (digs > 0 && *where && !isspace (*where))
|
|
return -1; /* Ended on non-space/nul */
|
|
|
|
return value;
|
|
}
|
|
|
|
static struct stat hstat; /* Stat struct corresponding */
|
|
|
|
static void tar_free_archive (vfs *me, vfs_s_super *archive)
|
|
{
|
|
if (archive->u.tar.fd != -1)
|
|
mc_close(archive->u.tar.fd);
|
|
}
|
|
|
|
/* As we open one archive at a time, it is safe to have this static */
|
|
static int current_tar_position = 0;
|
|
|
|
/* Returns fd of the open tar file */
|
|
static int tar_open_archive (vfs *me, char *name, vfs_s_super *archive)
|
|
{
|
|
int result, type;
|
|
long size;
|
|
mode_t mode;
|
|
struct vfs_s_inode *root;
|
|
|
|
result = mc_open (name, O_RDONLY);
|
|
if (result == -1) {
|
|
message_2s (1, MSG_ERROR, _("Couldn't open tar archive\n%s"), name);
|
|
ERRNOR (ENOENT, -1);
|
|
}
|
|
|
|
archive->name = g_strdup (name);
|
|
mc_stat (name, &(archive->u.tar.tarstat));
|
|
archive->u.tar.fd = -1;
|
|
|
|
/* Find out the method to handle this tar file */
|
|
size = is_gunzipable (result, &type);
|
|
mc_lseek (result, 0, SEEK_SET);
|
|
if (size > 0) {
|
|
char *s;
|
|
mc_close( result );
|
|
s = g_strconcat ( archive->name, decompress_extension (type), NULL );
|
|
result = mc_open (s, O_RDONLY);
|
|
if (result == -1)
|
|
message_2s (1, MSG_ERROR, _("Couldn't open tar archive\n%s"), s);
|
|
g_free(s);
|
|
if (result == -1)
|
|
ERRNOR (ENOENT, -1);
|
|
}
|
|
|
|
archive->u.tar.fd = result;
|
|
mode = archive->u.tar.tarstat.st_mode & 07777;
|
|
if (mode & 0400) mode |= 0100;
|
|
if (mode & 0040) mode |= 0010;
|
|
if (mode & 0004) mode |= 0001;
|
|
mode |= S_IFDIR;
|
|
|
|
root = vfs_s_new_inode (me, archive, &archive->u.tar.tarstat);
|
|
root->st.st_mode = mode;
|
|
root->u.tar.data_offset = -1;
|
|
root->st.st_nlink++;
|
|
root->st.st_dev = MEDATA->rdev++;
|
|
|
|
vfs_s_add_dots (me, root, NULL);
|
|
archive->root = root;
|
|
|
|
return result;
|
|
}
|
|
|
|
static union record rec_buf;
|
|
|
|
static union record *
|
|
get_next_record (vfs_s_super *archive, int tard)
|
|
{
|
|
int n;
|
|
|
|
n = mc_read (tard, rec_buf.charptr, RECORDSIZE);
|
|
if (n != RECORDSIZE)
|
|
return NULL; /* An error has occurred */
|
|
current_tar_position += RECORDSIZE;
|
|
return &rec_buf;
|
|
}
|
|
|
|
static void skip_n_records (vfs_s_super *archive, int tard, int n)
|
|
{
|
|
mc_lseek (tard, n * RECORDSIZE, SEEK_CUR);
|
|
current_tar_position += n * RECORDSIZE;
|
|
}
|
|
|
|
static void fill_stat_from_header (vfs *me, struct stat *st, union record *header)
|
|
{
|
|
st->st_mode = from_oct (8, header->header.mode);
|
|
|
|
/* Adjust st->st_mode because there are tar-files with
|
|
* linkflag==LF_SYMLINK and S_ISLNK(mod)==0. I don't
|
|
* know about the other modes but I think I cause no new
|
|
* problem when I adjust them, too. -- Norbert.
|
|
*/
|
|
if (header->header.linkflag == LF_DIR) {
|
|
st->st_mode |= S_IFDIR;
|
|
} else if (header->header.linkflag == LF_SYMLINK) {
|
|
st->st_mode |= S_IFLNK;
|
|
} else if (header->header.linkflag == LF_CHR) {
|
|
st->st_mode |= S_IFCHR;
|
|
} else if (header->header.linkflag == LF_BLK) {
|
|
st->st_mode |= S_IFBLK;
|
|
} else if (header->header.linkflag == LF_FIFO) {
|
|
st->st_mode |= S_IFIFO;
|
|
} else
|
|
st->st_mode |= S_IFREG;
|
|
|
|
st->st_rdev = 0;
|
|
if (!strcmp (header->header.magic, TMAGIC)) {
|
|
st->st_uid = *header->header.uname ? finduid (header->header.uname) :
|
|
from_oct (8, header->header.uid);
|
|
st->st_gid = *header->header.gname ? findgid (header->header.gname) :
|
|
from_oct (8, header->header.gid);
|
|
switch (header->header.linkflag) {
|
|
case LF_BLK:
|
|
case LF_CHR:
|
|
st->st_rdev = (from_oct (8, header->header.devmajor) << 8) |
|
|
from_oct (8, header->header.devminor);
|
|
}
|
|
} else { /* Old Unix tar */
|
|
st->st_uid = from_oct (8, header->header.uid);
|
|
st->st_gid = from_oct (8, header->header.gid);
|
|
}
|
|
st->st_size = hstat.st_size;
|
|
st->st_mtime = from_oct (1 + 12, header->header.mtime);
|
|
st->st_atime = from_oct (1 + 12, header->header.atime);
|
|
st->st_ctime = from_oct (1 + 12, header->header.ctime);
|
|
}
|
|
|
|
|
|
typedef enum {
|
|
STATUS_BADCHECKSUM,
|
|
STATUS_SUCCESS,
|
|
STATUS_EOFMARK,
|
|
STATUS_EOF,
|
|
} ReadStatus;
|
|
/*
|
|
* Return 1 for success, 0 if the checksum is bad, EOF on eof,
|
|
* 2 for a record full of zeros (EOF marker).
|
|
*
|
|
*/
|
|
static ReadStatus
|
|
read_header (vfs *me, vfs_s_super *archive, int tard)
|
|
{
|
|
register int i;
|
|
register long sum, signed_sum, recsum;
|
|
register char *p;
|
|
register union record *header;
|
|
char **longp;
|
|
char *bp, *data;
|
|
int size, written;
|
|
static char *next_long_name = NULL, *next_long_link = NULL;
|
|
char *current_file_name, *current_link_name;
|
|
|
|
recurse:
|
|
|
|
header = get_next_record (archive, tard);
|
|
if (NULL == header)
|
|
return STATUS_EOF;
|
|
|
|
recsum = from_oct (8, header->header.chksum);
|
|
|
|
sum = 0; signed_sum = 0;
|
|
p = header->charptr;
|
|
for (i = sizeof (*header); --i >= 0;) {
|
|
/*
|
|
* We can't use unsigned char here because of old compilers,
|
|
* e.g. V7.
|
|
*/
|
|
signed_sum += *p;
|
|
sum += 0xFF & *p++;
|
|
}
|
|
|
|
/* Adjust checksum to count the "chksum" field as blanks. */
|
|
for (i = sizeof (header->header.chksum); --i >= 0;) {
|
|
sum -= 0xFF & header->header.chksum[i];
|
|
signed_sum -= (char) header->header.chksum[i];
|
|
}
|
|
sum += ' ' * sizeof header->header.chksum;
|
|
signed_sum += ' ' * sizeof header->header.chksum;
|
|
|
|
/*
|
|
* This is a zeroed record...whole record is 0's except
|
|
* for the 8 blanks we faked for the checksum field.
|
|
*/
|
|
if (sum == 8 * ' ')
|
|
return STATUS_EOFMARK;
|
|
|
|
if (sum != recsum && signed_sum != recsum)
|
|
return STATUS_BADCHECKSUM;
|
|
|
|
/*
|
|
* linkflag on BSDI tar (pax) always '\000'
|
|
*/
|
|
if (header->header.linkflag == '\000' &&
|
|
strlen(header->header.arch_name) &&
|
|
header->header.arch_name[strlen(header->header.arch_name) - 1] == '/')
|
|
header->header.linkflag = LF_DIR;
|
|
|
|
/*
|
|
* Good record. Decode file size and return.
|
|
*/
|
|
if (header->header.linkflag == LF_LINK || header->header.linkflag == LF_DIR)
|
|
hstat.st_size = 0; /* Links 0 size on tape */
|
|
else
|
|
hstat.st_size = from_oct (1 + 12, header->header.size);
|
|
|
|
header->header.arch_name[NAMSIZ - 1] = '\0';
|
|
if (header->header.linkflag == LF_LONGNAME
|
|
|| header->header.linkflag == LF_LONGLINK) {
|
|
longp = ((header->header.linkflag == LF_LONGNAME)
|
|
? &next_long_name
|
|
: &next_long_link);
|
|
|
|
if (*longp)
|
|
g_free (*longp);
|
|
bp = *longp = g_malloc (hstat.st_size);
|
|
|
|
for (size = hstat.st_size;
|
|
size > 0;
|
|
size -= written) {
|
|
data = get_next_record (archive, tard)->charptr;
|
|
if (data == NULL) {
|
|
message_1s (1, MSG_ERROR, _("Unexpected EOF on archive file"));
|
|
return STATUS_BADCHECKSUM;
|
|
}
|
|
written = RECORDSIZE;
|
|
if (written > size)
|
|
written = size;
|
|
|
|
bcopy (data, bp, written);
|
|
bp += written;
|
|
}
|
|
#if 0
|
|
if (hstat.st_size > 1)
|
|
bp [hstat.st_size - 1] = 0; /* just to make sure */
|
|
#endif
|
|
goto recurse;
|
|
} else {
|
|
struct stat st;
|
|
struct vfs_s_entry *entry;
|
|
struct vfs_s_inode *inode, *parent;
|
|
long data_position;
|
|
char *p, *q;
|
|
int len;
|
|
int isdir = 0;
|
|
|
|
current_file_name = (next_long_name
|
|
? next_long_name
|
|
: g_strdup (header->header.arch_name));
|
|
len = strlen (current_file_name);
|
|
if (current_file_name[len - 1] == '/') {
|
|
current_file_name[len - 1] = 0;
|
|
isdir = 1;
|
|
}
|
|
|
|
current_link_name = (next_long_link
|
|
? next_long_link
|
|
: g_strdup (header->header.arch_linkname));
|
|
len = strlen (current_link_name);
|
|
if (len > 1 && current_link_name [len - 1] == '/')
|
|
current_link_name[len - 1] = 0;
|
|
|
|
next_long_link = next_long_name = NULL;
|
|
|
|
data_position = current_tar_position;
|
|
|
|
p = strrchr (current_file_name, '/');
|
|
if (p == NULL) {
|
|
p = current_file_name;
|
|
q = current_file_name + strlen (current_file_name); /* "" */
|
|
} else {
|
|
*(p++) = 0;
|
|
q = current_file_name;
|
|
}
|
|
|
|
parent = vfs_s_find_inode (me, archive->root, q, LINK_NO_FOLLOW, FL_MKDIR);
|
|
if (parent == NULL) {
|
|
message_1s (1, MSG_ERROR, _("Inconsistent tar archive"));
|
|
return STATUS_BADCHECKSUM;
|
|
}
|
|
|
|
if (header->header.linkflag == LF_LINK) {
|
|
inode = vfs_s_find_inode (me, archive->root, current_link_name, LINK_NO_FOLLOW, 0);
|
|
if (inode == NULL) {
|
|
message_1s (1, MSG_ERROR, _("Inconsistent tar archive"));
|
|
} else {
|
|
entry = vfs_s_new_entry(me, p, inode);
|
|
vfs_s_insert_entry(me, parent, entry);
|
|
g_free (current_link_name);
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
fill_stat_from_header (me, &st, header);
|
|
inode = vfs_s_new_inode (me, archive, &st);
|
|
|
|
inode->u.tar.data_offset = data_position;
|
|
if (*current_link_name)
|
|
inode->linkname = current_link_name;
|
|
entry = vfs_s_new_entry (me, p, inode);
|
|
|
|
vfs_s_insert_entry (me, parent, entry);
|
|
g_free (current_file_name);
|
|
|
|
done:
|
|
if (header->header.isextended) {
|
|
while (get_next_record (archive, tard)->ext_hdr.isextended);
|
|
inode->u.tar.data_offset = current_tar_position;
|
|
}
|
|
return STATUS_SUCCESS;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Main loop for reading an archive.
|
|
* Returns 0 on success, -1 on error.
|
|
*/
|
|
static int open_archive (vfs *me, vfs_s_super *archive, char *name, char *op)
|
|
{
|
|
ReadStatus status = STATUS_EOFMARK; /* Initial status at start of archive */
|
|
ReadStatus prev_status;
|
|
int tard;
|
|
|
|
current_tar_position = 0;
|
|
if ((tard = tar_open_archive (me, name, archive)) == -1) /* Open for reading */
|
|
return -1;
|
|
|
|
for (;;) {
|
|
prev_status = status;
|
|
status = read_header (me, archive, tard);
|
|
|
|
|
|
switch (status) {
|
|
|
|
case STATUS_SUCCESS:
|
|
skip_n_records (archive, tard, (hstat.st_size + RECORDSIZE - 1) / RECORDSIZE);
|
|
continue;
|
|
|
|
/*
|
|
* Invalid header:
|
|
*
|
|
* If the previous header was good, tell them
|
|
* that we are skipping bad ones.
|
|
*/
|
|
case STATUS_BADCHECKSUM:
|
|
switch (prev_status){
|
|
|
|
/* Error on first record */
|
|
case STATUS_EOFMARK:
|
|
message_2s (1, MSG_ERROR, _("Hmm,...\n%s\ndoesn't look like a tar archive."), name);
|
|
/* FALL THRU */
|
|
|
|
/* Error after header rec */
|
|
case STATUS_SUCCESS:
|
|
/* Error after error */
|
|
|
|
case STATUS_BADCHECKSUM:
|
|
return -1;
|
|
|
|
case STATUS_EOF:
|
|
return 0;
|
|
}
|
|
|
|
/* Record of zeroes */
|
|
case STATUS_EOFMARK:
|
|
status = prev_status; /* If error after 0's */
|
|
/* FALL THRU */
|
|
|
|
case STATUS_EOF: /* End of archive */
|
|
break;
|
|
}
|
|
break;
|
|
};
|
|
return 0;
|
|
}
|
|
|
|
void *tar_super_check(vfs *me, char *archive_name, char *op)
|
|
{
|
|
static struct stat stat_buf;
|
|
if (mc_stat (archive_name, &stat_buf))
|
|
return NULL;
|
|
return &stat_buf;
|
|
}
|
|
|
|
int tar_super_same(vfs *me, struct vfs_s_super *parc, char *archive_name, char *op, void *cookie)
|
|
{
|
|
struct stat *archive_stat = cookie; /* stat of main archive */
|
|
|
|
if (strcmp (parc->name, archive_name)) return 0;
|
|
|
|
if (vfs_uid && (!(archive_stat->st_mode & 0004)))
|
|
if ((archive_stat->st_gid != vfs_gid) || !(archive_stat->st_mode & 0040))
|
|
if ((archive_stat->st_uid != vfs_uid) || !(archive_stat->st_mode & 0400))
|
|
return 0;
|
|
/* Has the cached archive been changed on the disk? */
|
|
if (parc->u.tar.tarstat.st_mtime < archive_stat->st_mtime) { /* Yes, reload! */
|
|
(*vfs_tarfs_ops.free) ((vfsid) parc);
|
|
vfs_rmstamp (&vfs_tarfs_ops, (vfsid) parc, 0);
|
|
return 2;
|
|
}
|
|
/* Hasn't been modified, give it a new timeout */
|
|
vfs_stamp (&vfs_tarfs_ops, (vfsid) parc);
|
|
return 1;
|
|
}
|
|
|
|
static int tar_read (void *fh, char *buffer, int count)
|
|
{
|
|
off_t begin = FH->ino->u.tar.data_offset;
|
|
int fd = FH_SUPER->u.tar.fd;
|
|
vfs *me = FH_SUPER->me;
|
|
|
|
if (mc_lseek (fd, begin + FH->pos, SEEK_SET) !=
|
|
begin + FH->pos) ERRNOR (EIO, -1);
|
|
|
|
count = MIN(count, FH->ino->st.st_size - FH->pos);
|
|
|
|
if ((count = mc_read (fd, buffer, count)) == -1) ERRNOR (errno, -1);
|
|
|
|
FH->pos += count;
|
|
return count;
|
|
}
|
|
|
|
static int tar_ungetlocalcopy (vfs *me, char *path, char *local, int has_changed)
|
|
{
|
|
/* We do just nothing. (We are read only and do not need to free local,
|
|
since it will be freed when tar archive will be freed */
|
|
/* We have to report error if file has changed */
|
|
ERRNOR (EROFS, -has_changed);
|
|
}
|
|
|
|
static int tar_fh_open (vfs *me, vfs_s_fh *fh, int flags, int mode)
|
|
{
|
|
if ((flags & O_ACCMODE) != O_RDONLY) ERRNOR (EROFS, -1);
|
|
return 0;
|
|
}
|
|
|
|
static struct vfs_s_data tarfs_data = {
|
|
NULL,
|
|
0,
|
|
0,
|
|
NULL, /* logfile */
|
|
|
|
NULL, /* init_inode */
|
|
NULL, /* free_inode */
|
|
NULL, /* init_entry */
|
|
|
|
tar_super_check,
|
|
tar_super_same,
|
|
open_archive,
|
|
tar_free_archive,
|
|
|
|
tar_fh_open, /* fh_open */
|
|
NULL, /* fh_close */
|
|
|
|
vfs_s_find_entry_tree,
|
|
NULL,
|
|
NULL
|
|
};
|
|
|
|
vfs vfs_tarfs_ops =
|
|
{
|
|
NULL, /* This is place of next pointer */
|
|
"TApe aRchiver decompressor",
|
|
0, /* flags */
|
|
"utar", /* prefix */
|
|
&tarfs_data,
|
|
0, /* errno */
|
|
NULL,
|
|
NULL,
|
|
vfs_s_fill_names,
|
|
NULL,
|
|
|
|
vfs_s_open,
|
|
vfs_s_close,
|
|
tar_read,
|
|
NULL,
|
|
|
|
vfs_s_opendir,
|
|
vfs_s_readdir,
|
|
vfs_s_closedir,
|
|
vfs_s_telldir,
|
|
vfs_s_seekdir,
|
|
|
|
vfs_s_stat,
|
|
vfs_s_lstat,
|
|
vfs_s_fstat,
|
|
|
|
NULL,
|
|
NULL,
|
|
NULL,
|
|
|
|
vfs_s_readlink,
|
|
NULL,
|
|
NULL,
|
|
NULL,
|
|
|
|
NULL,
|
|
vfs_s_chdir,
|
|
vfs_s_ferrno,
|
|
vfs_s_lseek,
|
|
NULL,
|
|
|
|
vfs_s_getid,
|
|
vfs_s_nothingisopen,
|
|
vfs_s_free,
|
|
|
|
vfs_s_getlocalcopy,
|
|
tar_ungetlocalcopy,
|
|
|
|
NULL, /* mkdir */
|
|
NULL,
|
|
NULL,
|
|
NULL
|
|
|
|
MMAPNULL
|
|
};
|