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NetBSD/sbin/restore/dirs.c

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/* $NetBSD: dirs.c,v 1.48 2009/04/07 12:38:12 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/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)dirs.c 8.7 (Berkeley) 5/1/95";
#else
__RCSID("$NetBSD: dirs.c,v 1.48 2009/04/07 12:38:12 lukem Exp $");
#endif
#endif /* not lint */
#include <sys/param.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <ufs/ufs/dinode.h>
#include <ufs/ufs/dir.h>
#include <ufs/ffs/fs.h>
#include <protocols/dumprestore.h>
#include <err.h>
#include <errno.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <machine/endian.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 timeval ctimep[2];
struct timeval mtimep[2];
mode_t mode;
uid_t uid;
gid_t gid;
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;
static RST_DIR *dirp;
static char dirfile[MAXPATHLEN] = "#"; /* No file */
static char modefile[MAXPATHLEN] = "#"; /* 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 *, long);
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)
{
FILE *mf;
int i, dfd, mfd;
struct inotab *itp;
struct direct nulldir;
mf = NULL;
vprintf(stdout, "Extract directories from tape\n");
(void) snprintf(dirfile, sizeof(dirfile), "%s/rstdir%d",
tmpdir, (int)dumpdate);
if (command != 'r' && command != 'R') {
(void) snprintf(dirfile, sizeof(dirfile), "%s/rstdir%d-XXXXXX",
tmpdir, (int)dumpdate);
if ((dfd = mkstemp(dirfile)) == -1)
err(1, "cannot mkstemp temporary file %s", dirfile);
df = fdopen(dfd, "w");
}
else
df = fopen(dirfile, "w");
if (df == NULL)
err(1, "cannot open temporary file %s", dirfile);
if (genmode != 0) {
(void) snprintf(modefile, sizeof(modefile), "%s/rstmode%d",
tmpdir, (int)dumpdate);
if (command != 'r' && command != 'R') {
(void) snprintf(modefile, sizeof(modefile),
"%s/rstmode%d-XXXXXX", tmpdir, (int)dumpdate);
if ((mfd = mkstemp(modefile)) == -1)
err(1, "cannot mkstemp temporary file %s",
modefile);
mf = fdopen(mfd, "w");
}
else
mf = fopen(modefile, "w");
if (mf == NULL)
err(1, "cannot open temporary file %s", modefile);
}
nulldir.d_ino = 0;
nulldir.d_type = DT_DIR;
nulldir.d_namlen = 1;
(void) strcpy(nulldir.d_name, "/");
nulldir.d_reclen = DIRSIZ(0, &nulldir, 0);
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)
fprintf(stderr, "opendirfile: %s\n",
strerror(errno));
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(const char *pname, ino_t ino, long (*todo)(const char *, ino_t, int))
{
struct inotab *itp;
struct direct *dp;
size_t namelen;
long bpt;
char locname[MAXPATHLEN + 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 ".."
*/
(void) snprintf(locname, sizeof(locname), "%s/", pname);
namelen = strlen(locname);
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 %lu char\n",
locname, dp->d_name, (u_long)(sizeof(locname) - 1));
} else {
(void) strncat(locname, dp->d_name, (int)dp->d_namlen);
locname[namelen + dp->d_namlen] = '\0';
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[MAXPATHLEN];
strcpy(buffer, pathname);
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, long size)
{
struct direct cvtbuf;
struct odirect *odp;
struct odirect *eodp;
struct direct *dp;
long 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 = bswap32(dp->d_ino);
dp->d_reclen = bswap16(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(0, dp, 0) /* ||
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(0, dp, 0))
vprintf(stdout,
"reclen less than DIRSIZ (%d < %lu) ",
dp->d_reclen, (u_long)DIRSIZ(0, dp, 0));
#if 0 /* dp->d_namlen is a uint8_t, always < NAME_MAX */
if (dp->d_namlen > NAME_MAX)
vprintf(stdout,
"reclen name too big (%d > %d) ",
dp->d_namlen, NAME_MAX);
#endif
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(0, dp, 0);
if (dirloc + dp->d_reclen > DIRBLKSIZ) {
((struct direct *)(dirbuf + prev))->d_reclen =
DIRBLKSIZ - prev;
(void) fwrite(dirbuf, 1, DIRBLKSIZ, df);
dirloc = 0;
}
memmove(dirbuf + dirloc, dp, (long)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, (int)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 = bswap16(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(0, ndp, 0);
}
/*
* 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 *rdirp, long loc, long base)
{
if (loc == rst_telldir(rdirp))
return;
loc -= base;
if (loc < 0)
fprintf(stderr, "bad seek pointer to rst_seekdir %d\n",
(int)loc);
(void) lseek(rdirp->dd_fd, base + (loc & ~(DIRBLKSIZ - 1)), SEEK_SET);
rdirp->dd_loc = loc & (DIRBLKSIZ - 1);
if (rdirp->dd_loc != 0)
rdirp->dd_size = read(rdirp->dd_fd, rdirp->dd_buf, DIRBLKSIZ);
}
/*
* get next entry in a directory.
*/
struct direct *
rst_readdir(RST_DIR *rdirp)
{
struct direct *dp;
for (;;) {
if (rdirp->dd_loc == 0) {
rdirp->dd_size = read(rdirp->dd_fd, rdirp->dd_buf,
DIRBLKSIZ);
if (rdirp->dd_size <= 0) {
dprintf(stderr, "error reading directory\n");
return (NULL);
}
}
if (rdirp->dd_loc >= rdirp->dd_size) {
rdirp->dd_loc = 0;
continue;
}
dp = (struct direct *)(rdirp->dd_buf + rdirp->dd_loc);
if (dp->d_reclen == 0 ||
dp->d_reclen > DIRBLKSIZ + 1 - rdirp->dd_loc) {
dprintf(stderr, "corrupted directory: bad reclen %d\n",
dp->d_reclen);
return (NULL);
}
rdirp->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 %d\n",
dp->d_ino);
continue;
}
return (dp);
}
}
/*
* Simulate the opening of a directory
*/
RST_DIR *
rst_opendir(const char *name)
{
struct inotab *itp;
RST_DIR *rdirp;
ino_t ino;
if ((ino = dirlookup(name)) > 0 &&
(itp = inotablookup(ino)) != NULL) {
rdirp = opendirfile(dirfile);
rst_seekdir(rdirp, itp->t_seekpt, itp->t_seekpt);
return (rdirp);
}
return (NULL);
}
/*
* In our case, there is nothing to do when closing a directory.
*/
void
rst_closedir(RST_DIR *rdirp)
{
(void)close(rdirp->dd_fd);
free(rdirp);
return;
}
/*
* Simulate finding the current offset in the directory.
*/
static long
rst_telldir(RST_DIR *rdirp)
{
return ((long)lseek(rdirp->dd_fd,
(off_t)0, SEEK_CUR) - rdirp->dd_size + rdirp->dd_loc);
}
/*
* Open a directory file.
*/
static RST_DIR *
opendirfile(const char *name)
{
RST_DIR *rdirp;
int fd;
if ((fd = open(name, O_RDONLY)) == -1)
return (NULL);
if ((rdirp = malloc(sizeof(RST_DIR))) == NULL) {
(void)close(fd);
return (NULL);
}
rdirp->dd_fd = fd;
rdirp->dd_loc = 0;
return (rdirp);
}
/*
* 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%d",
tmpdir, (int)dumpdate);
if (modefile[0] == '#') {
panic("modefile not defined\n");
fprintf(stderr, "directory mode, owner, and times not set\n");
return;
}
mf = fopen(modefile, "r");
if (mf == NULL) {
fprintf(stderr, "fopen: %s\n", strerror(errno));
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 && dotflag == 0)
continue;
}
if (ep == NULL) {
panic("cannot find directory inode %llu\n",
(unsigned long long)node.ino);
} else {
if (!Nflag) {
cp = myname(ep);
(void) utimes(cp, node.ctimep);
(void) utimes(cp, node.mtimep);
(void) chown(cp, node.uid, node.gid);
(void) chmod(cp, node.mode);
if (Mtreefile) {
writemtree(cp, "dir",
node.uid, node.gid, node.mode,
node.flags);
} else
(void) chflags(cp, node.flags);
}
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(const 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)) < 0) {
fprintf(stderr, "%s: ", name);
(void) fflush(stderr);
fprintf(stderr, "cannot create file: %s\n", strerror(errno));
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, (int) size) == -1) {
fprintf(stderr,
"write error extracting inode %llu, name %s\n",
(unsigned long long)curfile.ino, curfile.name);
fprintf(stderr, "read: %s\n", strerror(errno));
exit(1);
}
if (!Nflag && write(ofile, buf, (int) size) == -1) {
fprintf(stderr,
"write error extracting inode %llu, name %s\n",
(unsigned long long)curfile.ino, curfile.name);
fprintf(stderr, "write: %s\n", strerror(errno));
exit(1);
}
}
(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 aseekpt)
{
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 = aseekpt;
if (mf == NULL)
return (itp);
node.ino = ctxp->ino;
node.mtimep[0].tv_sec = ctxp->atime_sec;
node.mtimep[0].tv_usec = ctxp->atime_nsec / 1000;
node.mtimep[1].tv_sec = ctxp->mtime_sec;
node.mtimep[1].tv_usec = ctxp->mtime_nsec / 1000;
node.ctimep[0].tv_sec = ctxp->atime_sec;
node.ctimep[0].tv_usec = ctxp->atime_nsec / 1000;
node.ctimep[1].tv_sec = ctxp->birthtime_sec;
node.ctimep[1].tv_usec = ctxp->birthtime_nsec / 1000;
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);
}
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