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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[] =
"@(#) Copyright (c) 1987, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
/*static char sccsid[] = "From: @(#)xinstall.c 8.1 (Berkeley) 7/21/93";*/
static const char rcsid[] =
"$Id: xinstall.c,v 1.6 1996/04/06 01:50:40 julian Exp $";
#endif /* not lint */
/*-
* Todo:
* o for -C, compare original files except in -s case.
* o for -C, don't change anything if nothing needs be changed. In
* particular, don't toggle the immutable flags just to allow null
* attribute changes and don't clear the dump flag. (I think inode
* ctimes are not updated for null attribute changes, but this is a
* bug.)
* o independent of -C, if a copy must be made, then copy to a tmpfile,
* set all attributes except the immutable flags, then rename, then
* set the immutable flags. It's annoying that the immutable flags
* defeat the atomicicity of rename - it seems that there must be
* o a window where the target is not immutable.
*/
#include <sys/param.h>
#include <sys/wait.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <grp.h>
#include <paths.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <unistd.h>
#include <utime.h>
#include "pathnames.h"
int debug, docompare, docopy, dopreserve, dostrip;
int mode = S_IRWXU|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
char *group, *owner, pathbuf[MAXPATHLEN];
char pathbuf2[MAXPATHLEN];
#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)
void copy __P((int, char *, int, char *, off_t));
int compare __P((int, const char *, int, const char *,
const struct stat *, const struct stat *));
void install __P((char *, char *, u_long, u_int));
u_long string_to_flags __P((char **, u_long *, u_long *));
void strip __P((char *));
void usage __P((void));
#define ALLOW_NUMERIC_IDS 1
#ifdef ALLOW_NUMERIC_IDS
uid_t uid;
gid_t gid;
uid_t resolve_uid __P((char *));
gid_t resolve_gid __P((char *));
u_long numeric_id __P((char *, char *));
#else
struct passwd *pp;
struct group *gp;
#endif /* ALLOW_NUMERIC_IDS */
int
main(argc, argv)
int argc;
char *argv[];
{
struct stat from_sb, to_sb;
mode_t *set;
u_long fset;
u_int iflags;
int ch, no_target;
char *flags, *to_name;
iflags = 0;
while ((ch = getopt(argc, argv, "Ccdf:g:m:o:ps")) != EOF)
switch((char)ch) {
case 'C':
docompare = docopy = 1;
break;
case 'c':
docopy = 1;
break;
case 'd':
debug++;
break;
case 'f':
flags = optarg;
if (string_to_flags(&flags, &fset, NULL))
errx(EX_USAGE, "%s: invalid flag", flags);
iflags |= SETFLAGS;
break;
case 'g':
group = optarg;
break;
case 'm':
if (!(set = setmode(optarg)))
errx(EX_USAGE, "invalid file mode: %s",
optarg);
mode = getmode(set, 0);
break;
case 'o':
owner = optarg;
break;
case 'p':
docompare = docopy = dopreserve = 1;
break;
case 's':
dostrip = 1;
break;
case '?':
default:
usage();
}
argc -= optind;
argv += optind;
if (argc < 2)
usage();
#ifdef ALLOW_NUMERIC_IDS
if (owner)
uid = resolve_uid(owner);
if (group)
gid = resolve_gid(group);
#else
/* get group and owner id's */
if (owner && !(pp = getpwnam(owner)))
errx(EX_NOUSER, "unknown user %s", owner);
if (group && !(gp = getgrnam(group)))
errx(EX_NOUSER, "unknown group %s", group);
#endif /* ALLOW_NUMERIC_IDS */
no_target = stat(to_name = argv[argc - 1], &to_sb);
if (!no_target && (to_sb.st_mode & S_IFMT) == S_IFDIR) {
for (; *argv != to_name; ++argv)
install(*argv, to_name, fset, iflags | DIRECTORY);
exit(0);
}
/* can't do file1 file2 directory/file */
if (argc != 2)
usage();
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);
}
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);
/*
* XXX - It's not at all clear why this code was here, since it completely
* duplicates code install(). The version in install() handles the -C flag
* correctly, so we'll just disable this for now.
*/
#if 0
/*
* Unlink now... avoid ETXTBSY errors later. Try and turn
* off the append/immutable bits -- if we fail, go ahead,
* it might work.
*/
if (to_sb.st_flags & NOCHANGEBITS)
(void)chflags(to_name,
to_sb.st_flags & ~(NOCHANGEBITS));
(void)unlink(to_name);
#endif
}
install(*argv, to_name, fset, iflags);
exit(0);
}
#ifdef ALLOW_NUMERIC_IDS
uid_t
resolve_uid(s)
char *s;
{
struct passwd *pw;
return ((pw = getpwnam(s)) == NULL) ?
(uid_t) numeric_id(s, "user") : pw->pw_uid;
}
gid_t
resolve_gid(s)
char *s;
{
struct group *gr;
return ((gr = getgrnam(s)) == NULL) ?
(gid_t) numeric_id(s, "group") : gr->gr_gid;
}
u_long
numeric_id(name, type)
char *name, *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);
}
#endif /* ALLOW_NUMERIC_IDS */
/*
* install --
* build a path name and install the file
*/
void
install(from_name, to_name, fset, flags)
char *from_name, *to_name;
u_long fset;
u_int flags;
{
struct stat from_sb, to_sb;
int devnull, from_fd, to_fd, serrno;
char *p, *old_to_name = 0;
if (debug >= 2 && !docompare)
fprintf(stderr, "install: invoked without -C for %s to %s\n",
from_name, to_name);
/* 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);
}
/* Build the target path. */
if (flags & DIRECTORY) {
(void)snprintf(pathbuf, sizeof(pathbuf), "%s/%s",
to_name,
(p = strrchr(from_name, '/')) ? ++p : from_name);
to_name = pathbuf;
}
devnull = 0;
} else {
from_sb.st_flags = 0; /* XXX */
devnull = 1;
}
if (docompare) {
old_to_name = to_name;
/*
* Make a new temporary file in the same file system
* (actually, in in the same directory) as the target so
* that the temporary file can be renamed to the target.
*/
snprintf(pathbuf2, sizeof pathbuf2, "%s", to_name);
p = strrchr(pathbuf2, '/');
p = (p == NULL ? pathbuf2 : p + 1);
snprintf(p, &pathbuf2[sizeof pathbuf2] - p, "INS@XXXX");
to_fd = mkstemp(pathbuf2);
if (to_fd < 0)
/* XXX should fall back to not comparing. */
err(EX_OSERR, "mkstemp: %s for %s", pathbuf2, to_name);
to_name = pathbuf2;
} else {
/*
* Unlink now... avoid errors later. Try to turn off the
* append/immutable bits -- if we fail, go ahead, it might
* work.
*/
if (stat(to_name, &to_sb) == 0 && to_sb.st_flags & NOCHANGEBITS)
(void)chflags(to_name, to_sb.st_flags & ~NOCHANGEBITS);
unlink(to_name);
/* Create target. */
to_fd = open(to_name,
O_CREAT | O_RDWR | O_TRUNC, S_IRUSR | S_IWUSR);
if (to_fd < 0)
err(EX_OSERR, "%s", to_name);
}
if (!devnull) {
if ((from_fd = open(from_name, O_RDONLY, 0)) < 0) {
serrno = errno;
(void)unlink(to_name);
errno = serrno;
err(EX_OSERR, "%s", from_name);
}
copy(from_fd, from_name, to_fd, to_name, from_sb.st_size);
(void)close(from_fd);
}
if (dostrip)
strip(to_name);
/*
* Unfortunately, because we strip the installed file and not the
* original one, it is impossible to do the comparison without
* first laboriously copying things over and then comparing.
* It may be possible to better optimize the !dostrip case, however.
* For further study.
*/
if (docompare) {
struct stat old_sb, new_sb, timestamp_sb;
int old_fd;
struct utimbuf utb;
old_fd = open(old_to_name, O_RDONLY, 0);
if (old_fd < 0 && errno == ENOENT)
goto different;
if (old_fd < 0)
err(EX_OSERR, "%s", old_to_name);
fstat(old_fd, &old_sb);
if (old_sb.st_flags & NOCHANGEBITS)
(void)fchflags(old_fd, old_sb.st_flags & ~NOCHANGEBITS);
fstat(to_fd, &new_sb);
if (compare(old_fd, old_to_name, to_fd, to_name, &old_sb,
&new_sb)) {
different:
if (debug != 0)
fprintf(stderr,
"install: renaming for %s: %s to %s\n",
from_name, to_name, old_to_name);
if (dopreserve && stat(from_name, ×tamp_sb) == 0) {
utb.actime = from_sb.st_atime;
utb.modtime = from_sb.st_mtime;
(void)utime(to_name, &utb);
}
moveit:
if (rename(to_name, old_to_name) < 0) {
serrno = errno;
unlink(to_name);
unlink(old_to_name);
errno = serrno;
err(EX_OSERR, "rename: %s to %s", to_name,
old_to_name);
}
close(old_fd);
} else {
if (old_sb.st_nlink != 1) {
/*
* Replace the target, although it hasn't
* changed, to snap the extra links. But
* preserve the target file times.
*/
if (fstat(old_fd, ×tamp_sb) == 0) {
utb.actime = timestamp_sb.st_atime;
utb.modtime = timestamp_sb.st_mtime;
(void)utime(to_name, &utb);
}
goto moveit;
}
if (unlink(to_name) < 0)
err(EX_OSERR, "unlink: %s", to_name);
close(to_fd);
to_fd = old_fd;
}
to_name = old_to_name;
}
/*
* Set owner, group, mode for target; do the chown first,
* chown may lose the setuid bits.
*/
if ((group || owner) &&
#ifdef ALLOW_NUMERIC_IDS
fchown(to_fd, owner ? uid : -1, group ? gid : -1)) {
#else
fchown(to_fd, owner ? pp->pw_uid : -1, group ? gp->gr_gid : -1)) {
#endif
serrno = errno;
(void)unlink(to_name);
errno = serrno;
err(EX_OSERR,"%s: chown/chgrp", to_name);
}
if (fchmod(to_fd, mode)) {
serrno = errno;
(void)unlink(to_name);
errno = serrno;
err(EX_OSERR, "%s: chmod", to_name);
}
/*
* If provided a set of flags, set them, otherwise, preserve the
* flags, except for the dump flag.
*/
if (fchflags(to_fd,
flags & SETFLAGS ? fset : from_sb.st_flags & ~UF_NODUMP)) {
serrno = errno;
(void)unlink(to_name);
errno = serrno;
err(EX_OSERR, "%s: chflags", to_name);
}
(void)close(to_fd);
if (!docopy && !devnull && unlink(from_name))
err(EX_OSERR, "%s", from_name);
}
/*
* compare --
* compare two files; non-zero means files differ
*/
int
compare(int from_fd, const char *from_name, int to_fd, const char *to_name,
const struct stat *from_sb, const struct stat *to_sb)
{
char *p, *q;
int rv;
size_t tsize;
if (from_sb->st_size != to_sb->st_size)
return 1;
tsize = (size_t)from_sb->st_size;
if (tsize <= 8 * 1024 * 1024) {
p = mmap(NULL, tsize, PROT_READ, 0, from_fd, (off_t)0);
if ((long)p == -1)
err(EX_OSERR, "mmap %s", from_name);
q = mmap(NULL, tsize, PROT_READ, 0, to_fd, (off_t)0);
if ((long)q == -1)
err(EX_OSERR, "mmap %s", to_name);
rv = memcmp(p, q, tsize);
munmap(p, tsize);
munmap(q, tsize);
} else {
rv = 1; /* don't bother in this case */
}
return rv;
}
/*
* copy --
* copy from one file to another
*/
void
copy(from_fd, from_name, to_fd, to_name, size)
register int from_fd, to_fd;
char *from_name, *to_name;
off_t size;
{
register int nr, nw;
int serrno;
char *p, buf[MAXBSIZE];
/*
* 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.
*/
if (size <= 8 * 1048576) {
if ((p = mmap(NULL, (size_t)size, PROT_READ,
0, from_fd, (off_t)0)) == (char *)-1)
err(EX_OSERR, "mmap %s", from_name);
if (write(to_fd, p, size) != size)
err(EX_OSERR, "%s", to_name);
} else {
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);
}
if (nr != 0) {
serrno = errno;
(void)unlink(to_name);
errno = serrno;
err(EX_OSERR, "%s", from_name);
}
}
}
/*
* strip --
* use strip(1) to strip the target file
*/
void
strip(to_name)
char *to_name;
{
int serrno, status;
switch (vfork()) {
case -1:
serrno = errno;
(void)unlink(to_name);
errno = serrno;
err(EX_TEMPFAIL, "fork");
case 0:
execl(_PATH_STRIP, "strip", to_name, NULL);
err(EX_OSERR, "exec(" _PATH_STRIP ")");
default:
if (wait(&status) == -1 || status)
(void)unlink(to_name);
}
}
/*
* usage --
* print a usage message and die
*/
void
usage()
{
(void)fprintf(stderr,
"usage: install [-Ccdps] [-f flags] [-g group] [-m mode] [-o owner] file1 file2;\n\tor file1 ... fileN directory\n");
exit(1);
}
|