freebsd-dev/usr.bin/xinstall/xinstall.c

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/*
* Copyright (c) 1987, 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 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.
*/
#ifndef lint
static const char copyright[] =
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"@(#) Copyright (c) 1987, 1993\n\
The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#if 0
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#ifndef lint
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static char sccsid[] = "@(#)xinstall.c 8.1 (Berkeley) 7/21/93";
#endif /* not lint */
#endif
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#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
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#include <sys/param.h>
#include <sys/mman.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/wait.h>
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#include <ctype.h>
#include <err.h>
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#include <errno.h>
#include <fcntl.h>
#include <grp.h>
#include <paths.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
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#include <sysexits.h>
#include <unistd.h>
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/* Bootstrap aid - this doesn't exist in most older releases */
#ifndef MAP_FAILED
#define MAP_FAILED ((void *)-1) /* from <sys/mman.h> */
#endif
#define MAX_CMP_SIZE (16 * 1024 * 1024)
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#define DIRECTORY 0x01 /* Tell install it's a directory. */
#define SETFLAGS 0x02 /* Tell install to set flags. */
#define NOCHANGEBITS (UF_IMMUTABLE | UF_APPEND | SF_IMMUTABLE | SF_APPEND)
#define BACKUP_SUFFIX ".old"
struct passwd *pp;
struct group *gp;
gid_t gid;
uid_t uid;
int dobackup, docompare, dodir, dopreserve, dostrip, nommap, safecopy, verbose;
mode_t mode = S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH;
const char *suffix = BACKUP_SUFFIX;
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void copy(int, const char *, int, const char *, off_t);
int compare(int, const char *, size_t, int, const char *, size_t);
int create_newfile(const char *, int, struct stat *);
int create_tempfile(const char *, char *, size_t);
void install(const char *, const char *, u_long, u_int);
void install_dir(char *);
u_long numeric_id(const char *, const char *);
void strip(const char *);
int trymmap(int);
void usage(void);
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int
main(int argc, char *argv[])
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{
struct stat from_sb, to_sb;
mode_t *set;
u_long fset;
int ch, no_target;
u_int iflags;
char *flags;
const char *group, *owner, *to_name;
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iflags = 0;
group = owner = NULL;
while ((ch = getopt(argc, argv, "B:bCcdf:g:Mm:o:pSsv")) != -1)
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switch((char)ch) {
case 'B':
suffix = optarg;
/* FALLTHROUGH */
case 'b':
dobackup = 1;
break;
case 'C':
docompare = 1;
break;
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case 'c':
/* For backwards compatibility. */
break;
case 'd':
dodir = 1;
break;
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case 'f':
flags = optarg;
if (strtofflags(&flags, &fset, NULL))
errx(EX_USAGE, "%s: invalid flag", flags);
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iflags |= SETFLAGS;
break;
case 'g':
group = optarg;
break;
case 'M':
nommap = 1;
break;
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case 'm':
if (!(set = setmode(optarg)))
errx(EX_USAGE, "invalid file mode: %s",
optarg);
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mode = getmode(set, 0);
free(set);
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break;
case 'o':
owner = optarg;
break;
case 'p':
docompare = dopreserve = 1;
break;
case 'S':
safecopy = 1;
break;
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case 's':
dostrip = 1;
break;
case 'v':
verbose = 1;
break;
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case '?':
default:
usage();
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}
argc -= optind;
argv += optind;
/* some options make no sense when creating directories */
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if (dostrip && dodir) {
warnx("-d and -s may not be specified together");
usage();
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}
/* must have at least two arguments, except when creating directories */
if (argc == 0 || (argc == 1 && !dodir))
usage();
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/* need to make a temp copy so we can compare stripped version */
if (docompare && dostrip)
safecopy = 1;
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/* get group and owner id's */
if (group != NULL) {
if ((gp = getgrnam(group)) != NULL)
gid = gp->gr_gid;
else
gid = (gid_t)numeric_id(group, "group");
} else
gid = (gid_t)-1;
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if (owner != NULL) {
if ((pp = getpwnam(owner)) != NULL)
uid = pp->pw_uid;
else
uid = (uid_t)numeric_id(owner, "user");
} else
uid = (uid_t)-1;
if (dodir) {
for (; *argv != NULL; ++argv)
install_dir(*argv);
exit(EX_OK);
/* NOTREACHED */
}
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no_target = stat(to_name = argv[argc - 1], &to_sb);
if (!no_target && S_ISDIR(to_sb.st_mode)) {
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for (; *argv != to_name; ++argv)
install(*argv, to_name, fset, iflags | DIRECTORY);
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exit(EX_OK);
/* NOTREACHED */
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}
/* can't do file1 file2 directory/file */
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if (argc != 2) {
warnx("wrong number or types of arguments");
usage();
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}
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if (!no_target) {
if (stat(*argv, &from_sb))
err(EX_OSERR, "%s", *argv);
if (!S_ISREG(to_sb.st_mode)) {
errno = EFTYPE;
err(EX_OSERR, "%s", to_name);
}
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if (to_sb.st_dev == from_sb.st_dev &&
to_sb.st_ino == from_sb.st_ino)
errx(EX_USAGE,
"%s and %s are the same file", *argv, to_name);
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}
install(*argv, to_name, fset, iflags);
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exit(EX_OK);
/* NOTREACHED */
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}
u_long
numeric_id(const char *name, const char *type)
{
u_long val;
char *ep;
/*
* XXX
* We know that uid_t's and gid_t's are unsigned longs.
*/
errno = 0;
val = strtoul(name, &ep, 10);
if (errno)
err(EX_NOUSER, "%s", name);
if (*ep != '\0')
errx(EX_NOUSER, "unknown %s %s", type, name);
return (val);
}
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/*
* install --
* build a path name and install the file
*/
void
install(const char *from_name, const char *to_name, u_long fset, u_int flags)
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{
struct stat from_sb, temp_sb, to_sb;
struct timeval tvb[2];
int devnull, files_match, from_fd, serrno, target;
int tempcopy, temp_fd, to_fd;
char backup[MAXPATHLEN], *p, pathbuf[MAXPATHLEN], tempfile[MAXPATHLEN];
files_match = 0;
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/* If try to install NULL file to a directory, fails. */
if (flags & DIRECTORY || strcmp(from_name, _PATH_DEVNULL)) {
if (stat(from_name, &from_sb))
err(EX_OSERR, "%s", from_name);
if (!S_ISREG(from_sb.st_mode)) {
errno = EFTYPE;
err(EX_OSERR, "%s", from_name);
}
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/* Build the target path. */
if (flags & DIRECTORY) {
(void)snprintf(pathbuf, sizeof(pathbuf), "%s/%s",
to_name,
(p = strrchr(from_name, '/')) ? ++p : from_name);
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to_name = pathbuf;
}
devnull = 0;
} else {
devnull = 1;
}
target = stat(to_name, &to_sb) == 0;
/* Only install to regular files. */
if (target && !S_ISREG(to_sb.st_mode)) {
errno = EFTYPE;
warn("%s", to_name);
return;
}
/* Only copy safe if the target exists. */
tempcopy = safecopy && target;
if (!devnull && (from_fd = open(from_name, O_RDONLY, 0)) < 0)
err(EX_OSERR, "%s", from_name);
/* If we don't strip, we can compare first. */
if (docompare && !dostrip && target) {
if ((to_fd = open(to_name, O_RDONLY, 0)) < 0)
err(EX_OSERR, "%s", to_name);
if (devnull)
files_match = to_sb.st_size == 0;
else
files_match = !(compare(from_fd, from_name,
(size_t)from_sb.st_size, to_fd,
to_name, (size_t)to_sb.st_size));
/* Close "to" file unless we match. */
if (!files_match)
(void)close(to_fd);
}
if (!files_match) {
if (tempcopy) {
to_fd = create_tempfile(to_name, tempfile,
sizeof(tempfile));
if (to_fd < 0)
err(EX_OSERR, "%s", tempfile);
} else {
if ((to_fd = create_newfile(to_name, target,
&to_sb)) < 0)
err(EX_OSERR, "%s", to_name);
if (verbose)
(void)printf("install: %s -> %s\n",
from_name, to_name);
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}
if (!devnull)
copy(from_fd, from_name, to_fd,
tempcopy ? tempfile : to_name, from_sb.st_size);
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}
if (dostrip) {
strip(tempcopy ? tempfile : to_name);
/*
* Re-open our fd on the target, in case we used a strip
* that does not work in-place -- like GNU binutils strip.
*/
close(to_fd);
to_fd = open(tempcopy ? tempfile : to_name, O_RDONLY, 0);
if (to_fd < 0)
err(EX_OSERR, "stripping %s", to_name);
}
/*
* Compare the stripped temp file with the target.
*/
if (docompare && dostrip && target) {
temp_fd = to_fd;
/* Re-open to_fd using the real target name. */
if ((to_fd = open(to_name, O_RDONLY, 0)) < 0)
err(EX_OSERR, "%s", to_name);
if (fstat(temp_fd, &temp_sb)) {
serrno = errno;
(void)unlink(tempfile);
errno = serrno;
err(EX_OSERR, "%s", tempfile);
}
if (compare(temp_fd, tempfile, (size_t)temp_sb.st_size, to_fd,
to_name, (size_t)to_sb.st_size) == 0) {
/*
* If target has more than one link we need to
* replace it in order to snap the extra links.
* Need to preserve target file times, though.
*/
if (to_sb.st_nlink != 1) {
tvb[0].tv_sec = to_sb.st_atime;
tvb[0].tv_usec = 0;
tvb[1].tv_sec = to_sb.st_mtime;
tvb[1].tv_usec = 0;
(void)utimes(tempfile, tvb);
} else {
files_match = 1;
(void)unlink(tempfile);
}
(void) close(temp_fd);
}
}
/*
* Move the new file into place if doing a safe copy
* and the files are different (or just not compared).
*/
if (tempcopy && !files_match) {
/* Try to turn off the immutable bits. */
if (to_sb.st_flags & NOCHANGEBITS)
(void)chflags(to_name, to_sb.st_flags & ~NOCHANGEBITS);
if (dobackup) {
if ((size_t)snprintf(backup, MAXPATHLEN, "%s%s", to_name,
suffix) != strlen(to_name) + strlen(suffix)) {
unlink(tempfile);
errx(EX_OSERR, "%s: backup filename too long",
to_name);
}
if (verbose)
(void)printf("install: %s -> %s\n", to_name, backup);
if (rename(to_name, backup) < 0) {
serrno = errno;
unlink(tempfile);
errno = serrno;
err(EX_OSERR, "rename: %s to %s", to_name,
backup);
}
}
if (verbose)
(void)printf("install: %s -> %s\n", from_name, to_name);
if (rename(tempfile, to_name) < 0) {
serrno = errno;
unlink(tempfile);
errno = serrno;
err(EX_OSERR, "rename: %s to %s",
tempfile, to_name);
}
/* Re-open to_fd so we aren't hosed by the rename(2). */
(void) close(to_fd);
if ((to_fd = open(to_name, O_RDONLY, 0)) < 0)
err(EX_OSERR, "%s", to_name);
}
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/*
* Preserve the timestamp of the source file if necessary.
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*/
if (dopreserve && !files_match && !devnull) {
tvb[0].tv_sec = from_sb.st_atime;
tvb[0].tv_usec = 0;
tvb[1].tv_sec = from_sb.st_mtime;
tvb[1].tv_usec = 0;
(void)utimes(to_name, tvb);
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}
if (fstat(to_fd, &to_sb) == -1) {
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serrno = errno;
(void)unlink(to_name);
errno = serrno;
err(EX_OSERR, "%s", to_name);
}
/*
* Set owner, group, mode for target; do the chown first,
* chown may lose the setuid bits.
*/
if ((gid != (gid_t)-1 && gid != to_sb.st_gid) ||
(uid != (uid_t)-1 && uid != to_sb.st_uid) ||
(mode != (to_sb.st_mode & ALLPERMS))) {
/* Try to turn off the immutable bits. */
if (to_sb.st_flags & NOCHANGEBITS)
(void)fchflags(to_fd, to_sb.st_flags & ~NOCHANGEBITS);
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}
if ((gid != (gid_t)-1 && gid != to_sb.st_gid) ||
(uid != (uid_t)-1 && uid != to_sb.st_uid))
if (fchown(to_fd, uid, gid) == -1) {
serrno = errno;
(void)unlink(to_name);
errno = serrno;
err(EX_OSERR,"%s: chown/chgrp", to_name);
}
if (mode != (to_sb.st_mode & ALLPERMS))
if (fchmod(to_fd, mode)) {
serrno = errno;
(void)unlink(to_name);
errno = serrno;
err(EX_OSERR, "%s: chmod", to_name);
}
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/*
* If provided a set of flags, set them, otherwise, preserve the
* flags, except for the dump flag.
* NFS does not support flags. Ignore EOPNOTSUPP flags if we're just
* trying to turn off UF_NODUMP. If we're trying to set real flags,
* then warn if the the fs doesn't support it, otherwise fail.
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*/
if (!devnull && (flags & SETFLAGS ||
(from_sb.st_flags & ~UF_NODUMP) != to_sb.st_flags) &&
fchflags(to_fd,
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flags & SETFLAGS ? fset : from_sb.st_flags & ~UF_NODUMP)) {
if (flags & SETFLAGS) {
if (errno == EOPNOTSUPP)
warn("%s: chflags", to_name);
else {
serrno = errno;
(void)unlink(to_name);
errno = serrno;
err(EX_OSERR, "%s: chflags", to_name);
}
}
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}
(void)close(to_fd);
if (!devnull)
(void)close(from_fd);
}
/*
* compare --
* compare two files; non-zero means files differ
*/
int
compare(int from_fd, const char *from_name __unused, size_t from_len,
int to_fd, const char *to_name __unused, size_t to_len)
{
char *p, *q;
int rv;
int done_compare;
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rv = 0;
if (from_len != to_len)
return 1;
if (from_len <= MAX_CMP_SIZE) {
done_compare = 0;
if (trymmap(from_fd) && trymmap(to_fd)) {
p = mmap(NULL, from_len, PROT_READ, MAP_SHARED, from_fd, (off_t)0);
if (p == (char *)MAP_FAILED)
goto out;
q = mmap(NULL, from_len, PROT_READ, MAP_SHARED, to_fd, (off_t)0);
if (q == (char *)MAP_FAILED) {
munmap(p, from_len);
goto out;
}
rv = memcmp(p, q, from_len);
munmap(p, from_len);
munmap(q, from_len);
done_compare = 1;
}
out:
if (!done_compare) {
char buf1[MAXBSIZE];
char buf2[MAXBSIZE];
int n1, n2;
rv = 0;
lseek(from_fd, 0, SEEK_SET);
lseek(to_fd, 0, SEEK_SET);
while (rv == 0) {
n1 = read(from_fd, buf1, sizeof(buf1));
if (n1 == 0)
break; /* EOF */
else if (n1 > 0) {
n2 = read(to_fd, buf2, n1);
if (n2 == n1)
rv = memcmp(buf1, buf2, n1);
else
rv = 1; /* out of sync */
} else
rv = 1; /* read failure */
}
lseek(from_fd, 0, SEEK_SET);
lseek(to_fd, 0, SEEK_SET);
}
} else
rv = 1; /* don't bother in this case */
return rv;
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}
/*
* create_tempfile --
* create a temporary file based on path and open it
*/
int
create_tempfile(const char *path, char *temp, size_t tsize)
{
char *p;
(void)strncpy(temp, path, tsize);
temp[tsize - 1] = '\0';
if ((p = strrchr(temp, '/')) != NULL)
p++;
else
p = temp;
(void)strncpy(p, "INS@XXXX", &temp[tsize - 1] - p);
temp[tsize - 1] = '\0';
return (mkstemp(temp));
}
/*
* create_newfile --
* create a new file, overwriting an existing one if necessary
*/
int
create_newfile(const char *path, int target, struct stat *sbp)
{
char backup[MAXPATHLEN];
int saved_errno = 0;
int newfd;
if (target) {
/*
* Unlink now... avoid ETXTBSY errors later. Try to turn
* off the append/immutable bits -- if we fail, go ahead,
* it might work.
*/
if (sbp->st_flags & NOCHANGEBITS)
(void)chflags(path, sbp->st_flags & ~NOCHANGEBITS);
if (dobackup) {
if ((size_t)snprintf(backup, MAXPATHLEN, "%s%s",
path, suffix) != strlen(path) + strlen(suffix))
errx(EX_OSERR, "%s: backup filename too long",
path);
(void)snprintf(backup, MAXPATHLEN, "%s%s",
path, suffix);
if (verbose)
(void)printf("install: %s -> %s\n",
path, backup);
if (rename(path, backup) < 0)
err(EX_OSERR, "rename: %s to %s", path, backup);
} else
if (unlink(path) < 0)
saved_errno = errno;
}
newfd = open(path, O_CREAT | O_RDWR | O_TRUNC, S_IRUSR | S_IWUSR);
if (newfd < 0 && saved_errno != 0)
errno = saved_errno;
return newfd;
}
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/*
* copy --
* copy from one file to another
*/
void
copy(int from_fd, const char *from_name, int to_fd, const char *to_name,
off_t size)
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{
int nr, nw;
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int serrno;
char *p, buf[MAXBSIZE];
int done_copy;
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/* Rewind file descriptors. */
if (lseek(from_fd, (off_t)0, SEEK_SET) == (off_t)-1)
err(EX_OSERR, "lseek: %s", from_name);
if (lseek(to_fd, (off_t)0, SEEK_SET) == (off_t)-1)
err(EX_OSERR, "lseek: %s", to_name);
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/*
* Mmap and write if less than 8M (the limit is so we don't totally
* trash memory on big files. This is really a minor hack, but it
* wins some CPU back.
*/
done_copy = 0;
if (size <= 8 * 1048576 && trymmap(from_fd) &&
(p = mmap(NULL, (size_t)size, PROT_READ, MAP_SHARED,
from_fd, (off_t)0)) != (char *)MAP_FAILED) {
if ((nw = write(to_fd, p, size)) != size) {
serrno = errno;
(void)unlink(to_name);
errno = nw > 0 ? EIO : serrno;
err(EX_OSERR, "%s", to_name);
}
done_copy = 1;
}
if (!done_copy) {
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while ((nr = read(from_fd, buf, sizeof(buf))) > 0)
if ((nw = write(to_fd, buf, nr)) != nr) {
serrno = errno;
(void)unlink(to_name);
errno = nw > 0 ? EIO : serrno;
err(EX_OSERR, "%s", to_name);
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}
if (nr != 0) {
serrno = errno;
(void)unlink(to_name);
errno = serrno;
err(EX_OSERR, "%s", from_name);
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}
}
}
/*
* strip --
* use strip(1) to strip the target file
*/
void
strip(const char *to_name)
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{
const char *stripbin;
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int serrno, status;
switch (fork()) {
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case -1:
serrno = errno;
(void)unlink(to_name);
errno = serrno;
err(EX_TEMPFAIL, "fork");
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case 0:
stripbin = getenv("STRIPBIN");
if (stripbin == NULL)
stripbin = "strip";
execlp(stripbin, stripbin, to_name, (char *)NULL);
err(EX_OSERR, "exec(%s)", stripbin);
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default:
if (wait(&status) == -1 || status) {
serrno = errno;
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(void)unlink(to_name);
errc(EX_SOFTWARE, serrno, "wait");
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/* NOTREACHED */
}
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}
}
/*
* install_dir --
* build directory heirarchy
*/
void
install_dir(char *path)
{
char *p;
struct stat sb;
int ch;
for (p = path;; ++p)
if (!*p || (p != path && *p == '/')) {
ch = *p;
*p = '\0';
if (stat(path, &sb)) {
if (errno != ENOENT || mkdir(path, 0755) < 0) {
err(EX_OSERR, "mkdir %s", path);
/* NOTREACHED */
} else if (verbose)
(void)printf("install: mkdir %s\n",
path);
} else if (!S_ISDIR(sb.st_mode))
errx(EX_OSERR, "%s exists but is not a directory", path);
if (!(*p = ch))
break;
}
if ((gid != (gid_t)-1 || uid != (uid_t)-1) && chown(path, uid, gid))
warn("chown %u:%u %s", uid, gid, path);
if (chmod(path, mode))
warn("chmod %o %s", mode, path);
}
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/*
* usage --
* print a usage message and die
*/
void
usage()
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{
(void)fprintf(stderr,
"usage: install [-bCcpSsv] [-B suffix] [-f flags] [-g group] [-m mode]\n"
" [-o owner] file1 file2\n"
" install [-bCcpSsv] [-B suffix] [-f flags] [-g group] [-m mode]\n"
" [-o owner] file1 ... fileN directory\n"
" install -d [-v] [-g group] [-m mode] [-o owner] directory ...\n");
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exit(EX_USAGE);
/* NOTREACHED */
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}
/*
* trymmap --
* return true (1) if mmap should be tried, false (0) if not.
*/
int
trymmap(int fd)
{
/*
* The ifdef is for bootstrapping - f_fstypename doesn't exist in
* pre-Lite2-merge systems.
*/
#ifdef MFSNAMELEN
struct statfs stfs;
if (nommap || fstatfs(fd, &stfs) != 0)
return (0);
if (strcmp(stfs.f_fstypename, "ufs") == 0 ||
strcmp(stfs.f_fstypename, "cd9660") == 0)
return (1);
#endif
return (0);
}