/* $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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #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 = ""; 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); }