SecBSD
/
src
2
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
src/sbin/restore/dirs.c

741 lines
18 KiB
C
Raw Permalink Blame History

/* $OpenBSD: dirs.c,v 1.43 2024/01/09 03:16:00 guenther Exp $ */
/* $NetBSD: dirs.c,v 1.26 1997/07/01 05:37:49 lukem Exp $ */
/*
* Copyright (c) 1983, 1993
* The Regents of the University of California. All rights reserved.
* (c) UNIX System Laboratories, Inc.
* All or some portions of this file are derived from material licensed
* to the University of California by American Telephone and Telegraph
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
* the permission of UNIX System Laboratories, Inc.
*
* 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.
* 3. 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.
*/
#include <sys/stat.h>
#include <sys/time.h>
#include <ufs/ffs/fs.h>
#include <ufs/ufs/dinode.h>
#include <ufs/ufs/dir.h>
#include <protocols/dumprestore.h>
#include <endian.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>
#include "restore.h"
#include "extern.h"
/*
* Symbol table of directories read from tape.
*/
#define HASHSIZE 1000
#define INOHASH(val) (val % HASHSIZE)
struct inotab {
struct inotab *t_next;
ino_t t_ino;
int32_t t_seekpt;
int32_t t_size;
};
static struct inotab *inotab[HASHSIZE];
/*
* Information retained about directories.
*/
struct modeinfo {
ino_t ino;
struct timespec ctimep[2];
struct timespec mtimep[2];
mode_t mode;
uid_t uid;
gid_t gid;
u_int flags;
};
/*
* Definitions for library routines operating on directories.
*/
#undef DIRBLKSIZ
#define DIRBLKSIZ 1024
struct rstdirdesc {
int dd_fd;
int32_t dd_loc;
int32_t dd_size;
char dd_buf[DIRBLKSIZ];
};
/*
* Global variables for this file.
*/
static long seekpt;
static FILE *df, *mf;
static RST_DIR *dirp;
static char dirfile[PATH_MAX] = "#"; /* No file */
static char modefile[PATH_MAX] = "#"; /* No file */
static char dot[2] = "."; /* So it can be modified */
/*
* Format of old style directories.
*/
#define ODIRSIZ 14
struct odirect {
u_short d_ino;
char d_name[ODIRSIZ];
};
static struct inotab *allocinotab(FILE *, struct context *, long);
static void dcvt(struct odirect *, struct direct *);
static void flushent(void);
static struct inotab *inotablookup(ino_t);
static RST_DIR *opendirfile(const char *);
static void putdir(char *, size_t);
static void putent(struct direct *);
static void rst_seekdir(RST_DIR *, long, long);
static long rst_telldir(RST_DIR *);
static struct direct *searchdir(ino_t, char *);
/*
* Extract directory contents, building up a directory structure
* on disk for extraction by name.
* If genmode is requested, save mode, owner, and times for all
* directories on the tape.
*/
void
extractdirs(int genmode)
{
int i;
struct inotab *itp;
struct direct nulldir;
int fd;
Vprintf(stdout, "Extract directories from tape\n");
(void)snprintf(dirfile, sizeof(dirfile), "%s/rstdir%lld", tmpdir,
(long long)dumpdate);
if (command != 'r' && command != 'R') {
strlcat(dirfile, "-XXXXXXXXXX", sizeof(dirfile));
fd = mkstemp(dirfile);
} else
fd = open(dirfile, O_RDWR|O_CREAT|O_EXCL, 0666);
if (fd == -1 || (df = fdopen(fd, "w")) == NULL) {
int saved_errno = errno;
if (fd != -1)
close(fd);
errc(1, saved_errno,
"cannot create directory temporary %s", dirfile);
}
if (genmode != 0) {
(void)snprintf(modefile, sizeof(modefile), "%s/rstmode%lld",
tmpdir, (long long)dumpdate);
if (command != 'r' && command != 'R') {
strlcat(modefile, "-XXXXXXXXXX", sizeof(modefile));
fd = mkstemp(modefile);
} else
fd = open(modefile, O_RDWR|O_CREAT|O_EXCL, 0666);
if (fd == -1 || (mf = fdopen(fd, "w")) == NULL) {
int saved_errno = errno;
if (fd != -1)
close(fd);
errc(1, saved_errno,
"cannot create modefile %s", modefile);
}
}
nulldir.d_ino = 0;
nulldir.d_type = DT_DIR;
nulldir.d_namlen = 1;
nulldir.d_name[0] = '/';
nulldir.d_name[1] = '\0';
nulldir.d_reclen = DIRSIZ(&nulldir);
for (;;) {
curfile.name = "<directory file - name unknown>";
curfile.action = USING;
if (curfile.mode == 0 || (curfile.mode & IFMT) != IFDIR) {
(void)fclose(df);
dirp = opendirfile(dirfile);
if (dirp == NULL)
warn("opendirfile");
if (mf != NULL)
(void)fclose(mf);
i = dirlookup(dot);
if (i == 0)
panic("Root directory is not on tape\n");
return;
}
itp = allocinotab(mf, &curfile, seekpt);
getfile(putdir, xtrnull);
putent(&nulldir);
flushent();
itp->t_size = seekpt - itp->t_seekpt;
}
}
/*
* skip over all the directories on the tape
*/
void
skipdirs(void)
{
while (curfile.ino && (curfile.mode & IFMT) == IFDIR) {
skipfile();
}
}
/*
* Recursively find names and inumbers of all files in subtree
* pname and pass them off to be processed.
*/
void
treescan(char *pname, ino_t ino, long (*todo)(char *, ino_t, int))
{
struct inotab *itp;
struct direct *dp;
size_t namelen;
long bpt;
char locname[PATH_MAX + 1];
itp = inotablookup(ino);
if (itp == NULL) {
/*
* Pname is name of a simple file or an unchanged directory.
*/
(void)(*todo)(pname, ino, LEAF);
return;
}
/*
* Pname is a dumped directory name.
*/
if ((*todo)(pname, ino, NODE) == FAIL)
return;
/*
* begin search through the directory
* skipping over "." and ".."
*/
namelen = strlcpy(locname, pname, sizeof(locname));
if (namelen >= sizeof(locname) - 1)
namelen = sizeof(locname) - 2;
locname[namelen++] = '/';
locname[namelen] = '\0';
rst_seekdir(dirp, itp->t_seekpt, itp->t_seekpt);
dp = rst_readdir(dirp); /* "." */
if (dp != NULL && strcmp(dp->d_name, ".") == 0)
dp = rst_readdir(dirp); /* ".." */
else
fprintf(stderr, "Warning: `.' missing from directory %s\n",
pname);
if (dp != NULL && strcmp(dp->d_name, "..") == 0)
dp = rst_readdir(dirp); /* first real entry */
else
fprintf(stderr, "Warning: `..' missing from directory %s\n",
pname);
bpt = rst_telldir(dirp);
/*
* a zero inode signals end of directory
*/
while (dp != NULL) {
locname[namelen] = '\0';
if (namelen + dp->d_namlen >= sizeof(locname)) {
fprintf(stderr, "%s%s: name exceeds %zd char\n",
locname, dp->d_name, sizeof(locname) - 1);
} else {
(void)strlcat(locname, dp->d_name, sizeof(locname));
treescan(locname, dp->d_ino, todo);
rst_seekdir(dirp, bpt, itp->t_seekpt);
}
dp = rst_readdir(dirp);
bpt = rst_telldir(dirp);
}
}
/*
* Lookup a pathname which is always assumed to start from the ROOTINO.
*/
struct direct *
pathsearch(const char *pathname)
{
ino_t ino;
struct direct *dp;
char *path, *name, buffer[PATH_MAX];
strlcpy(buffer, pathname, sizeof buffer);
path = buffer;
ino = ROOTINO;
while (*path == '/')
path++;
dp = NULL;
while ((name = strsep(&path, "/")) != NULL && *name != '\0') {
if ((dp = searchdir(ino, name)) == NULL)
return (NULL);
ino = dp->d_ino;
}
return (dp);
}
/*
* Lookup the requested name in directory inum.
* Return its inode number if found, zero if it does not exist.
*/
static struct direct *
searchdir(ino_t inum, char *name)
{
struct direct *dp;
struct inotab *itp;
int len;
itp = inotablookup(inum);
if (itp == NULL)
return (NULL);
rst_seekdir(dirp, itp->t_seekpt, itp->t_seekpt);
len = strlen(name);
do {
dp = rst_readdir(dirp);
if (dp == NULL)
return (NULL);
} while (dp->d_namlen != len || strncmp(dp->d_name, name, len) != 0);
return (dp);
}
/*
* Put the directory entries in the directory file
*/
static void
putdir(char *buf, size_t size)
{
struct direct cvtbuf;
struct odirect *odp;
struct odirect *eodp;
struct direct *dp;
size_t loc, i;
if (cvtflag) {
eodp = (struct odirect *)&buf[size];
for (odp = (struct odirect *)buf; odp < eodp; odp++)
if (odp->d_ino != 0) {
dcvt(odp, &cvtbuf);
putent(&cvtbuf);
}
} else {
for (loc = 0; loc < size; ) {
dp = (struct direct *)(buf + loc);
if (Bcvt) {
dp->d_ino = swap32(dp->d_ino);
dp->d_reclen = swap16(dp->d_reclen);
}
if (oldinofmt && dp->d_ino != 0) {
# if BYTE_ORDER == BIG_ENDIAN
if (Bcvt)
dp->d_namlen = dp->d_type;
# else
if (!Bcvt)
dp->d_namlen = dp->d_type;
# endif
dp->d_type = DT_UNKNOWN;
}
i = DIRBLKSIZ - (loc & (DIRBLKSIZ - 1));
if ((dp->d_reclen & 0x3) != 0 ||
dp->d_reclen > i ||
dp->d_reclen < DIRSIZ(dp) ||
dp->d_namlen > NAME_MAX) {
Vprintf(stdout, "Mangled directory: ");
if ((dp->d_reclen & 0x3) != 0)
Vprintf(stdout,
"reclen not multiple of 4 ");
if (dp->d_reclen < DIRSIZ(dp))
Vprintf(stdout,
"reclen less than DIRSIZ (%u < %u) ",
(unsigned)dp->d_reclen,
(unsigned)DIRSIZ(dp));
if (dp->d_namlen > NAME_MAX)
Vprintf(stdout,
"reclen name too big (%u > %u) ",
(unsigned)dp->d_namlen, NAME_MAX);
Vprintf(stdout, "\n");
loc += i;
continue;
}
loc += dp->d_reclen;
if (dp->d_ino != 0) {
putent(dp);
}
}
}
}
/*
* These variables are "local" to the following two functions.
*/
char dirbuf[DIRBLKSIZ];
long dirloc = 0;
long prev = 0;
/*
* add a new directory entry to a file.
*/
static void
putent(struct direct *dp)
{
dp->d_reclen = DIRSIZ(dp);
if (dirloc + dp->d_reclen > DIRBLKSIZ) {
((struct direct *)(dirbuf + prev))->d_reclen =
DIRBLKSIZ - prev;
(void)fwrite(dirbuf, 1, DIRBLKSIZ, df);
dirloc = 0;
}
memcpy(dirbuf + dirloc, dp, dp->d_reclen);
prev = dirloc;
dirloc += dp->d_reclen;
}
/*
* flush out a directory that is finished.
*/
static void
flushent(void)
{
((struct direct *)(dirbuf + prev))->d_reclen = DIRBLKSIZ - prev;
(void)fwrite(dirbuf, dirloc, 1, df);
seekpt = ftell(df);
dirloc = 0;
}
static void
dcvt(struct odirect *odp, struct direct *ndp)
{
memset(ndp, 0, sizeof *ndp);
if (Bcvt)
ndp->d_ino = swap16(odp->d_ino);
else
ndp->d_ino = odp->d_ino;
ndp->d_type = DT_UNKNOWN;
(void)strncpy(ndp->d_name, odp->d_name, ODIRSIZ);
ndp->d_namlen = strlen(ndp->d_name);
ndp->d_reclen = DIRSIZ(ndp);
}
/*
* Seek to an entry in a directory.
* Only values returned by rst_telldir should be passed to rst_seekdir.
* This routine handles many directories in a single file.
* It takes the base of the directory in the file, plus
* the desired seek offset into it.
*/
static void
rst_seekdir(RST_DIR *dirp, long loc, long base)
{
if (loc == rst_telldir(dirp))
return;
loc -= base;
if (loc < 0)
fprintf(stderr, "bad seek pointer to rst_seekdir %ld\n", loc);
(void)lseek(dirp->dd_fd, base + (loc & ~(DIRBLKSIZ - 1)), SEEK_SET);
dirp->dd_loc = loc & (DIRBLKSIZ - 1);
if (dirp->dd_loc != 0)
dirp->dd_size = read(dirp->dd_fd, dirp->dd_buf, DIRBLKSIZ);
}
/*
* get next entry in a directory.
*/
struct direct *
rst_readdir(RST_DIR *dirp)
{
struct direct *dp;
for (;;) {
if (dirp->dd_loc == 0) {
dirp->dd_size = read(dirp->dd_fd, dirp->dd_buf,
DIRBLKSIZ);
if (dirp->dd_size <= 0) {
Dprintf(stderr, "error reading directory\n");
return (NULL);
}
}
if (dirp->dd_loc >= dirp->dd_size) {
dirp->dd_loc = 0;
continue;
}
dp = (struct direct *)(dirp->dd_buf + dirp->dd_loc);
if (dp->d_reclen == 0 ||
dp->d_reclen > DIRBLKSIZ + 1 - dirp->dd_loc) {
Dprintf(stderr, "corrupted directory: bad reclen %d\n",
dp->d_reclen);
return (NULL);
}
dirp->dd_loc += dp->d_reclen;
if (dp->d_ino == 0 && strcmp(dp->d_name, "/") == 0)
return (NULL);
if (dp->d_ino >= maxino) {
Dprintf(stderr, "corrupted directory: bad inum %llu\n",
(unsigned long long)dp->d_ino);
continue;
}
return (dp);
}
}
/*
* Simulate the opening of a directory
*/
RST_DIR *
rst_opendir(const char *name)
{
struct inotab *itp;
RST_DIR *dirp;
ino_t ino;
if ((ino = dirlookup(name)) > 0 &&
(itp = inotablookup(ino)) != NULL) {
dirp = opendirfile(dirfile);
rst_seekdir(dirp, itp->t_seekpt, itp->t_seekpt);
return (dirp);
}
return (NULL);
}
/*
* In our case, there is nothing to do when closing a directory.
*/
void
rst_closedir(RST_DIR *dirp)
{
(void)close(dirp->dd_fd);
free(dirp);
return;
}
/*
* Simulate finding the current offset in the directory.
*/
static long
rst_telldir(RST_DIR *dirp)
{
return ((long)lseek(dirp->dd_fd,
(off_t)0, SEEK_CUR) - dirp->dd_size + dirp->dd_loc);
}
/*
* Open a directory file.
*/
static RST_DIR *
opendirfile(const char *name)
{
RST_DIR *dirp;
int fd;
if ((fd = open(name, O_RDONLY)) == -1)
return (NULL);
if ((dirp = malloc(sizeof(RST_DIR))) == NULL) {
(void)close(fd);
return (NULL);
}
dirp->dd_fd = fd;
dirp->dd_loc = 0;
return (dirp);
}
/*
* Set the mode, owner, and times for all new or changed directories
*/
void
setdirmodes(int flags)
{
FILE *mf;
struct modeinfo node;
struct entry *ep;
char *cp;
Vprintf(stdout, "Set directory mode, owner, and times.\n");
if (command == 'r' || command == 'R')
(void)snprintf(modefile, sizeof(modefile), "%s/rstmode%lld",
tmpdir, (long long)dumpdate);
if (modefile[0] == '#') {
panic("modefile not defined\n");
fputs("directory mode, owner, and times not set\n", stderr);
return;
}
mf = fopen(modefile, "r");
if (mf == NULL) {
warn("fopen");
fprintf(stderr, "cannot open mode file %s\n", modefile);
fprintf(stderr, "directory mode, owner, and times not set\n");
return;
}
clearerr(mf);
for (;;) {
(void)fread((char *)&node, 1, sizeof(struct modeinfo), mf);
if (feof(mf))
break;
ep = lookupino(node.ino);
if (command == 'i' || command == 'x') {
if (ep == NULL)
continue;
if ((flags & FORCE) == 0 && ep->e_flags & EXISTED) {
ep->e_flags &= ~NEW;
continue;
}
if (node.ino == ROOTINO &&
reply("set owner/mode for '.'") == FAIL)
continue;
}
if (ep == NULL) {
panic("cannot find directory inode %llu\n",
(unsigned long long)node.ino);
} else {
if (!Nflag) {
cp = myname(ep);
(void)chown(cp, node.uid, node.gid);
(void)chmod(cp, node.mode);
(void)chflags(cp, node.flags);
(void)utimensat(AT_FDCWD, cp, node.ctimep, 0);
(void)utimensat(AT_FDCWD, cp, node.mtimep, 0);
}
ep->e_flags &= ~NEW;
}
}
if (ferror(mf))
panic("error setting directory modes\n");
(void)fclose(mf);
}
/*
* Generate a literal copy of a directory.
*/
int
genliteraldir(char *name, ino_t ino)
{
struct inotab *itp;
int ofile, dp, i, size;
char buf[BUFSIZ];
itp = inotablookup(ino);
if (itp == NULL)
panic("Cannot find directory inode %llu named %s\n",
(unsigned long long)ino, name);
if ((ofile = open(name, O_WRONLY | O_CREAT | O_TRUNC, 0666)) == -1) {
warn("%s: cannot create file", name);
return (FAIL);
}
rst_seekdir(dirp, itp->t_seekpt, itp->t_seekpt);
dp = dup(dirp->dd_fd);
for (i = itp->t_size; i > 0; i -= BUFSIZ) {
size = i < BUFSIZ ? i : BUFSIZ;
if (read(dp, buf, size) == -1)
err(1, "read error extracting inode %llu, name %s",
(unsigned long long)curfile.ino, curfile.name);
xtrfile(buf, size);
}
(void)close(dp);
(void)close(ofile);
return (GOOD);
}
/*
* Determine the type of an inode
*/
int
inodetype(ino_t ino)
{
struct inotab *itp;
itp = inotablookup(ino);
if (itp == NULL)
return (LEAF);
return (NODE);
}
/*
* Allocate and initialize a directory inode entry.
* If requested, save its pertinent mode, owner, and time info.
*/
static struct inotab *
allocinotab(FILE *mf, struct context *ctxp, long seekpt)
{
struct inotab *itp;
struct modeinfo node;
itp = calloc(1, sizeof(struct inotab));
if (itp == NULL)
panic("no memory directory table\n");
itp->t_next = inotab[INOHASH(ctxp->ino)];
inotab[INOHASH(ctxp->ino)] = itp;
itp->t_ino = ctxp->ino;
itp->t_seekpt = seekpt;
if (mf == NULL)
return (itp);
node.ino = ctxp->ino;
node.mtimep[0].tv_sec = ctxp->atime_sec;
node.mtimep[0].tv_nsec = ctxp->atime_nsec;
node.mtimep[1].tv_sec = ctxp->mtime_sec;
node.mtimep[1].tv_nsec = ctxp->mtime_nsec;
node.ctimep[0].tv_sec = ctxp->atime_sec;
node.ctimep[0].tv_nsec = ctxp->atime_nsec;
node.ctimep[1].tv_sec = ctxp->birthtime_sec;
node.ctimep[1].tv_nsec = ctxp->birthtime_nsec;
node.mode = ctxp->mode;
node.flags = ctxp->file_flags;
node.uid = ctxp->uid;
node.gid = ctxp->gid;
(void)fwrite((char *)&node, 1, sizeof(struct modeinfo), mf);
return (itp);
}
/*
* Look up an inode in the table of directories
*/
static struct inotab *
inotablookup(ino_t ino)
{
struct inotab *itp;
for (itp = inotab[INOHASH(ino)]; itp != NULL; itp = itp->t_next)
if (itp->t_ino == ino)
return (itp);
return (NULL);
}
/*
* Clean up and exit
*/
void
cleanup(void)
{
closemt();
if (modefile[0] != '#')
(void)unlink(modefile);
if (dirfile[0] != '#')
(void)unlink(dirfile);
}
Reference in New Issue View Git Blame Copy Permalink