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freebsd-dev/usr.bin/xinstall/xinstall.c
Dag-Erling Smørgrav 54d8d0fe12 xinstall: use dynamic bufsize as in cat(1) / cp(1). 
Sponsored by:	Klara, Inc.
2022-08-03 23:01:13 +02:00

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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 2012, 2013 SRI International
* 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. 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 */
#if 0
#ifndef lint
static char sccsid[] = "@(#)xinstall.c 8.1 (Berkeley) 7/21/93";
#endif /* not lint */
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/mman.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <grp.h>
#include <libgen.h>
#ifdef WITH_MD5
#include <md5.h>
#endif
#include <paths.h>
#include <pwd.h>
#ifdef WITH_RIPEMD160
#include <ripemd.h>
#endif
#include <sha.h>
#include <sha256.h>
#include <sha512.h>
#include <spawn.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <unistd.h>
#include <vis.h>
#include "mtree.h"
/*
* Memory strategy threshold, in pages: if physmem is larger then this, use a
* large buffer.
*/
#define PHYSPAGES_THRESHOLD (32*1024)
/* Maximum buffer size in bytes - do not allow it to grow larger than this. */
#define BUFSIZE_MAX (2*1024*1024)
/*
* Small (default) buffer size in bytes. It's inefficient for this to be
* smaller than MAXPHYS.
*/
#define BUFSIZE_SMALL (MAXPHYS)
/*
* We need to build xinstall during the bootstrap stage when building on a
* non-FreeBSD system. Linux does not have the st_flags and st_birthtime
* members in struct stat so we need to omit support for changing those fields.
*/
#ifdef UF_SETTABLE
#define HAVE_STRUCT_STAT_ST_FLAGS 1
#else
#define HAVE_STRUCT_STAT_ST_FLAGS 0
#endif
#define MAX_CMP_SIZE (16 * 1024 * 1024)
#define LN_ABSOLUTE 0x01
#define LN_RELATIVE 0x02
#define LN_HARD 0x04
#define LN_SYMBOLIC 0x08
#define LN_MIXED 0x10
#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"
typedef union {
#ifdef WITH_MD5
MD5_CTX MD5;
#endif
#ifdef WITH_RIPEMD160
RIPEMD160_CTX RIPEMD160;
#endif
SHA1_CTX SHA1;
SHA256_CTX SHA256;
SHA512_CTX SHA512;
} DIGEST_CTX;
static enum {
DIGEST_NONE = 0,
#ifdef WITH_MD5
DIGEST_MD5,
#endif
#ifdef WITH_RIPEMD160
DIGEST_RIPEMD160,
#endif
DIGEST_SHA1,
DIGEST_SHA256,
DIGEST_SHA512,
} digesttype = DIGEST_NONE;
extern char **environ;
static gid_t gid;
static uid_t uid;
static int dobackup, docompare, dodir, dolink, dopreserve, dostrip, dounpriv,
safecopy, verbose;
static int haveopt_f, haveopt_g, haveopt_m, haveopt_o;
static mode_t mode = S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH;
static FILE *metafp;
static const char *group, *owner;
static const char *suffix = BACKUP_SUFFIX;
static char *destdir, *digest, *fflags, *metafile, *tags;
static int compare(int, const char *, size_t, int, const char *, size_t,
char **);
static char *copy(int, const char *, int, const char *, off_t);
static int create_newfile(const char *, int, struct stat *);
static int create_tempfile(const char *, char *, size_t);
static char *quiet_mktemp(char *template);
static char *digest_file(const char *);
static void digest_init(DIGEST_CTX *);
static void digest_update(DIGEST_CTX *, const char *, size_t);
static char *digest_end(DIGEST_CTX *, char *);
static int do_link(const char *, const char *, const struct stat *);
static void do_symlink(const char *, const char *, const struct stat *);
static void makelink(const char *, const char *, const struct stat *);
static void install(const char *, const char *, u_long, u_int);
static void install_dir(char *);
static void metadata_log(const char *, const char *, struct timespec *,
const char *, const char *, off_t);
static int parseid(const char *, id_t *);
static int strip(const char *, int, const char *, char **);
static int trymmap(size_t);
static void usage(void);
int
main(int argc, char *argv[])
{
struct stat from_sb, to_sb;
mode_t *set;
u_long fset;
int ch, no_target;
u_int iflags;
char *p;
const char *to_name;
fset = 0;
iflags = 0;
group = owner = NULL;
while ((ch = getopt(argc, argv, "B:bCcD:df:g:h:l:M:m:N:o:pSsT:Uv")) !=
-1)
switch((char)ch) {
case 'B':
suffix = optarg;
/* FALLTHROUGH */
case 'b':
dobackup = 1;
break;
case 'C':
docompare = 1;
break;
case 'c':
/* For backwards compatibility. */
break;
case 'D':
destdir = optarg;
break;
case 'd':
dodir = 1;
break;
case 'f':
haveopt_f = 1;
fflags = optarg;
break;
case 'g':
haveopt_g = 1;
group = optarg;
break;
case 'h':
digest = optarg;
break;
case 'l':
for (p = optarg; *p != '\0'; p++)
switch (*p) {
case 's':
dolink &= ~(LN_HARD|LN_MIXED);
dolink |= LN_SYMBOLIC;
break;
case 'h':
dolink &= ~(LN_SYMBOLIC|LN_MIXED);
dolink |= LN_HARD;
break;
case 'm':
dolink &= ~(LN_SYMBOLIC|LN_HARD);
dolink |= LN_MIXED;
break;
case 'a':
dolink &= ~LN_RELATIVE;
dolink |= LN_ABSOLUTE;
break;
case 'r':
dolink &= ~LN_ABSOLUTE;
dolink |= LN_RELATIVE;
break;
default:
errx(1, "%c: invalid link type", *p);
/* NOTREACHED */
}
break;
case 'M':
metafile = optarg;
break;
case 'm':
haveopt_m = 1;
if (!(set = setmode(optarg)))
errx(EX_USAGE, "invalid file mode: %s",
optarg);
mode = getmode(set, 0);
free(set);
break;
case 'N':
if (!setup_getid(optarg))
err(EX_OSERR, "Unable to use user and group "
"databases in `%s'", optarg);
break;
case 'o':
haveopt_o = 1;
owner = optarg;
break;
case 'p':
docompare = dopreserve = 1;
break;
case 'S':
safecopy = 1;
break;
case 's':
dostrip = 1;
break;
case 'T':
tags = optarg;
break;
case 'U':
dounpriv = 1;
break;
case 'v':
verbose = 1;
break;
case '?':
default:
usage();
}
argc -= optind;
argv += optind;
/* some options make no sense when creating directories */
if (dostrip && dodir) {
warnx("-d and -s may not be specified together");
usage();
}
if (getenv("DONTSTRIP") != NULL) {
warnx("DONTSTRIP set - will not strip installed binaries");
dostrip = 0;
}
/* must have at least two arguments, except when creating directories */
if (argc == 0 || (argc == 1 && !dodir))
usage();
if (digest != NULL) {
if (strcmp(digest, "none") == 0) {
digesttype = DIGEST_NONE;
#ifdef WITH_MD5
} else if (strcmp(digest, "md5") == 0) {
digesttype = DIGEST_MD5;
#endif
#ifdef WITH_RIPEMD160
} else if (strcmp(digest, "rmd160") == 0) {
digesttype = DIGEST_RIPEMD160;
#endif
} else if (strcmp(digest, "sha1") == 0) {
digesttype = DIGEST_SHA1;
} else if (strcmp(digest, "sha256") == 0) {
digesttype = DIGEST_SHA256;
} else if (strcmp(digest, "sha512") == 0) {
digesttype = DIGEST_SHA512;
} else {
warnx("unknown digest `%s'", digest);
usage();
}
}
/* need to make a temp copy so we can compare stripped version */
if (docompare && dostrip)
safecopy = 1;
/* get group and owner id's */
if (group != NULL && !dounpriv) {
if (gid_from_group(group, &gid) == -1) {
id_t id;
if (!parseid(group, &id))
errx(1, "unknown group %s", group);
gid = id;
}
} else
gid = (gid_t)-1;
if (owner != NULL && !dounpriv) {
if (uid_from_user(owner, &uid) == -1) {
id_t id;
if (!parseid(owner, &id))
errx(1, "unknown user %s", owner);
uid = id;
}
} else
uid = (uid_t)-1;
if (fflags != NULL && !dounpriv) {
if (strtofflags(&fflags, &fset, NULL))
errx(EX_USAGE, "%s: invalid flag", fflags);
iflags |= SETFLAGS;
}
if (metafile != NULL) {
if ((metafp = fopen(metafile, "a")) == NULL)
warn("open %s", metafile);
} else
digesttype = DIGEST_NONE;
if (dodir) {
for (; *argv != NULL; ++argv)
install_dir(*argv);
exit(EX_OK);
/* NOTREACHED */
}
to_name = argv[argc - 1];
no_target = stat(to_name, &to_sb);
if (!no_target && S_ISDIR(to_sb.st_mode)) {
if (dolink & LN_SYMBOLIC) {
if (lstat(to_name, &to_sb) != 0)
err(EX_OSERR, "%s vanished", to_name);
if (S_ISLNK(to_sb.st_mode)) {
if (argc != 2) {
errno = ENOTDIR;
err(EX_USAGE, "%s", to_name);
}
install(*argv, to_name, fset, iflags);
exit(EX_OK);
}
}
for (; *argv != to_name; ++argv)
install(*argv, to_name, fset, iflags | DIRECTORY);
exit(EX_OK);
/* NOTREACHED */
}
/* can't do file1 file2 directory/file */
if (argc != 2) {
if (no_target)
warnx("target directory `%s' does not exist",
argv[argc - 1]);
else
warnx("target `%s' is not a directory",
argv[argc - 1]);
usage();
}
if (!no_target && !dolink) {
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);
}
install(*argv, to_name, fset, iflags);
exit(EX_OK);
/* NOTREACHED */
}
static char *
digest_file(const char *name)
{
switch (digesttype) {
#ifdef WITH_MD5
case DIGEST_MD5:
return (MD5File(name, NULL));
#endif
#ifdef WITH_RIPEMD160
case DIGEST_RIPEMD160:
return (RIPEMD160_File(name, NULL));
#endif
case DIGEST_SHA1:
return (SHA1_File(name, NULL));
case DIGEST_SHA256:
return (SHA256_File(name, NULL));
case DIGEST_SHA512:
return (SHA512_File(name, NULL));
default:
return (NULL);
}
}
static void
digest_init(DIGEST_CTX *c)
{
switch (digesttype) {
case DIGEST_NONE:
break;
#ifdef WITH_MD5
case DIGEST_MD5:
MD5Init(&(c->MD5));
break;
#endif
#ifdef WITH_RIPEMD160
case DIGEST_RIPEMD160:
RIPEMD160_Init(&(c->RIPEMD160));
break;
#endif
case DIGEST_SHA1:
SHA1_Init(&(c->SHA1));
break;
case DIGEST_SHA256:
SHA256_Init(&(c->SHA256));
break;
case DIGEST_SHA512:
SHA512_Init(&(c->SHA512));
break;
}
}
static void
digest_update(DIGEST_CTX *c, const char *data, size_t len)
{
switch (digesttype) {
case DIGEST_NONE:
break;
#ifdef WITH_MD5
case DIGEST_MD5:
MD5Update(&(c->MD5), data, len);
break;
#endif
#ifdef WITH_RIPEMD160
case DIGEST_RIPEMD160:
RIPEMD160_Update(&(c->RIPEMD160), data, len);
break;
#endif
case DIGEST_SHA1:
SHA1_Update(&(c->SHA1), data, len);
break;
case DIGEST_SHA256:
SHA256_Update(&(c->SHA256), data, len);
break;
case DIGEST_SHA512:
SHA512_Update(&(c->SHA512), data, len);
break;
}
}
static char *
digest_end(DIGEST_CTX *c, char *buf)
{
switch (digesttype) {
#ifdef WITH_MD5
case DIGEST_MD5:
return (MD5End(&(c->MD5), buf));
#endif
#ifdef WITH_RIPEMD160
case DIGEST_RIPEMD160:
return (RIPEMD160_End(&(c->RIPEMD160), buf));
#endif
case DIGEST_SHA1:
return (SHA1_End(&(c->SHA1), buf));
case DIGEST_SHA256:
return (SHA256_End(&(c->SHA256), buf));
case DIGEST_SHA512:
return (SHA512_End(&(c->SHA512), buf));
default:
return (NULL);
}
}
/*
* parseid --
* parse uid or gid from arg into id, returning non-zero if successful
*/
static int
parseid(const char *name, id_t *id)
{
char *ep;
errno = 0;
*id = (id_t)strtoul(name, &ep, 10);
if (errno || *ep != '\0')
return (0);
return (1);
}
/*
* quiet_mktemp --
* mktemp implementation used mkstemp to avoid mktemp warnings. We
* really do need mktemp semantics here as we will be creating a link.
*/
static char *
quiet_mktemp(char *template)
{
int fd;
if ((fd = mkstemp(template)) == -1)
return (NULL);
close (fd);
if (unlink(template) == -1)
err(EX_OSERR, "unlink %s", template);
return (template);
}
/*
* do_link --
* make a hard link, obeying dorename if set
* return -1 on failure
*/
static int
do_link(const char *from_name, const char *to_name,
const struct stat *target_sb)
{
char tmpl[MAXPATHLEN];
int ret;
if (safecopy && target_sb != NULL) {
(void)snprintf(tmpl, sizeof(tmpl), "%s.inst.XXXXXX", to_name);
/* This usage is safe. */
if (quiet_mktemp(tmpl) == NULL)
err(EX_OSERR, "%s: mktemp", tmpl);
ret = link(from_name, tmpl);
if (ret == 0) {
if (target_sb->st_mode & S_IFDIR && rmdir(to_name) ==
-1) {
unlink(tmpl);
err(EX_OSERR, "%s", to_name);
}
#if HAVE_STRUCT_STAT_ST_FLAGS
if (target_sb->st_flags & NOCHANGEBITS)
(void)chflags(to_name, target_sb->st_flags &
~NOCHANGEBITS);
#endif
if (verbose)
printf("install: link %s -> %s\n",
from_name, to_name);
ret = rename(tmpl, to_name);
/*
* If rename has posix semantics, then the temporary
* file may still exist when from_name and to_name point
* to the same file, so unlink it unconditionally.
*/
(void)unlink(tmpl);
}
return (ret);
} else {
if (verbose)
printf("install: link %s -> %s\n",
from_name, to_name);
return (link(from_name, to_name));
}
}
/*
* do_symlink --
* Make a symbolic link, obeying dorename if set. Exit on failure.
*/
static void
do_symlink(const char *from_name, const char *to_name,
const struct stat *target_sb)
{
char tmpl[MAXPATHLEN];
if (safecopy && target_sb != NULL) {
(void)snprintf(tmpl, sizeof(tmpl), "%s.inst.XXXXXX", to_name);
/* This usage is safe. */
if (quiet_mktemp(tmpl) == NULL)
err(EX_OSERR, "%s: mktemp", tmpl);
if (symlink(from_name, tmpl) == -1)
err(EX_OSERR, "symlink %s -> %s", from_name, tmpl);
if (target_sb->st_mode & S_IFDIR && rmdir(to_name) == -1) {
(void)unlink(tmpl);
err(EX_OSERR, "%s", to_name);
}
#if HAVE_STRUCT_STAT_ST_FLAGS
if (target_sb->st_flags & NOCHANGEBITS)
(void)chflags(to_name, target_sb->st_flags &
~NOCHANGEBITS);
#endif
if (verbose)
printf("install: symlink %s -> %s\n",
from_name, to_name);
if (rename(tmpl, to_name) == -1) {
/* Remove temporary link before exiting. */
(void)unlink(tmpl);
err(EX_OSERR, "%s: rename", to_name);
}
} else {
if (verbose)
printf("install: symlink %s -> %s\n",
from_name, to_name);
if (symlink(from_name, to_name) == -1)
err(EX_OSERR, "symlink %s -> %s", from_name, to_name);
}
}
/*
* makelink --
* make a link from source to destination
*/
static void
makelink(const char *from_name, const char *to_name,
const struct stat *target_sb)
{
char src[MAXPATHLEN], dst[MAXPATHLEN], lnk[MAXPATHLEN];
struct stat to_sb;
/* Try hard links first. */
if (dolink & (LN_HARD|LN_MIXED)) {
if (do_link(from_name, to_name, target_sb) == -1) {
if ((dolink & LN_HARD) || errno != EXDEV)
err(EX_OSERR, "link %s -> %s", from_name, to_name);
} else {
if (stat(to_name, &to_sb))
err(EX_OSERR, "%s: stat", to_name);
if (S_ISREG(to_sb.st_mode)) {
/*
* XXX: hard links to anything other than
* plain files are not metalogged
*/
int omode;
const char *oowner, *ogroup;
char *offlags;
char *dres;
/*
* XXX: use underlying perms, unless
* overridden on command line.
*/
omode = mode;
if (!haveopt_m)
mode = (to_sb.st_mode & 0777);
oowner = owner;
if (!haveopt_o)
owner = NULL;
ogroup = group;
if (!haveopt_g)
group = NULL;
offlags = fflags;
if (!haveopt_f)
fflags = NULL;
dres = digest_file(from_name);
metadata_log(to_name, "file", NULL, NULL,
dres, to_sb.st_size);
free(dres);
mode = omode;
owner = oowner;
group = ogroup;
fflags = offlags;
}
return;
}
}
/* Symbolic links. */
if (dolink & LN_ABSOLUTE) {
/* Convert source path to absolute. */
if (realpath(from_name, src) == NULL)
err(EX_OSERR, "%s: realpath", from_name);
do_symlink(src, to_name, target_sb);
/* XXX: src may point outside of destdir */
metadata_log(to_name, "link", NULL, src, NULL, 0);
return;
}
if (dolink & LN_RELATIVE) {
char *to_name_copy, *cp, *d, *ld, *ls, *s;
if (*from_name != '/') {
/* this is already a relative link */
do_symlink(from_name, to_name, target_sb);
/* XXX: from_name may point outside of destdir. */
metadata_log(to_name, "link", NULL, from_name, NULL, 0);
return;
}
/* Resolve pathnames. */
if (realpath(from_name, src) == NULL)
err(EX_OSERR, "%s: realpath", from_name);
/*
* The last component of to_name may be a symlink,
* so use realpath to resolve only the directory.
*/
to_name_copy = strdup(to_name);
if (to_name_copy == NULL)
err(EX_OSERR, "%s: strdup", to_name);
cp = dirname(to_name_copy);
if (realpath(cp, dst) == NULL)
err(EX_OSERR, "%s: realpath", cp);
/* .. and add the last component. */
if (strcmp(dst, "/") != 0) {
if (strlcat(dst, "/", sizeof(dst)) > sizeof(dst))
errx(1, "resolved pathname too long");
}
strcpy(to_name_copy, to_name);
cp = basename(to_name_copy);
if (strlcat(dst, cp, sizeof(dst)) > sizeof(dst))
errx(1, "resolved pathname too long");
free(to_name_copy);
/* Trim common path components. */
ls = ld = NULL;
for (s = src, d = dst; *s == *d; ls = s, ld = d, s++, d++)
continue;
/*
* If we didn't end after a directory separator, then we've
* falsely matched the last component. For example, if one
* invoked install -lrs /lib/foo.so /libexec/ then the source
* would terminate just after the separator while the
* destination would terminate in the middle of 'libexec',
* leading to a full directory getting falsely eaten.
*/
if ((ls != NULL && *ls != '/') || (ld != NULL && *ld != '/'))
s--, d--;
while (*s != '/')
s--, d--;
/* Count the number of directories we need to backtrack. */
for (++d, lnk[0] = '\0'; *d; d++)
if (*d == '/')
(void)strlcat(lnk, "../", sizeof(lnk));
(void)strlcat(lnk, ++s, sizeof(lnk));
do_symlink(lnk, to_name, target_sb);
/* XXX: Link may point outside of destdir. */
metadata_log(to_name, "link", NULL, lnk, NULL, 0);
return;
}
/*
* If absolute or relative was not specified, try the names the
* user provided.
*/
do_symlink(from_name, to_name, target_sb);
/* XXX: from_name may point outside of destdir. */
metadata_log(to_name, "link", NULL, from_name, NULL, 0);
}
/*
* install --
* build a path name and install the file
*/
static void
install(const char *from_name, const char *to_name, u_long fset, u_int flags)
{
struct stat from_sb, temp_sb, to_sb;
struct timespec tsb[2];
int devnull, files_match, from_fd, serrno, stripped, target;
int tempcopy, temp_fd, to_fd;
char backup[MAXPATHLEN], *p, pathbuf[MAXPATHLEN], tempfile[MAXPATHLEN];
char *digestresult;
digestresult = NULL;
files_match = stripped = 0;
from_fd = -1;
to_fd = -1;
/* If try to install NULL file to a directory, fails. */
if (flags & DIRECTORY || strcmp(from_name, _PATH_DEVNULL)) {
if (!dolink) {
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%s",
to_name,
to_name[strlen(to_name) - 1] == '/' ? "" : "/",
(p = strrchr(from_name, '/')) ? ++p : from_name);
to_name = pathbuf;
}
devnull = 0;
} else {
devnull = 1;
}
target = (lstat(to_name, &to_sb) == 0);
if (dolink) {
if (target && !safecopy) {
if (to_sb.st_mode & S_IFDIR && rmdir(to_name) == -1)
err(EX_OSERR, "%s", to_name);
#if HAVE_STRUCT_STAT_ST_FLAGS
if (to_sb.st_flags & NOCHANGEBITS)
(void)chflags(to_name,
to_sb.st_flags & ~NOCHANGEBITS);
#endif
unlink(to_name);
}
makelink(from_name, to_name, target ? &to_sb : NULL);
return;
}
if (target && !S_ISREG(to_sb.st_mode) && !S_ISLNK(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 && S_ISREG(to_sb.st_mode)) {
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, &digestresult));
/* 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);
}
if (!devnull) {
if (dostrip)
stripped = strip(tempcopy ? tempfile : to_name,
to_fd, from_name, &digestresult);
if (!stripped)
digestresult = copy(from_fd, from_name, to_fd,
tempcopy ? tempfile : to_name, from_sb.st_size);
}
}
if (dostrip) {
if (!stripped)
(void)strip(tempcopy ? tempfile : to_name, to_fd,
NULL, &digestresult);
/*
* Re-open our fd on the target, in case
* we did not strip in-place.
*/
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 && S_ISREG(to_sb.st_mode)) {
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, &digestresult)
== 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) {
tsb[0] = to_sb.st_atim;
tsb[1] = to_sb.st_mtim;
(void)utimensat(AT_FDCWD, tempfile, tsb, 0);
} else {
files_match = 1;
(void)unlink(tempfile);
}
(void) close(temp_fd);
}
} else if (dostrip)
digestresult = digest_file(tempfile);
/*
* Move the new file into place if doing a safe copy
* and the files are different (or just not compared).
*/
if (tempcopy && !files_match) {
#if HAVE_STRUCT_STAT_ST_FLAGS
/* Try to turn off the immutable bits. */
if (to_sb.st_flags & NOCHANGEBITS)
(void)chflags(to_name, to_sb.st_flags & ~NOCHANGEBITS);
#endif
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 (unlink(backup) < 0 && errno != ENOENT) {
serrno = errno;
#if HAVE_STRUCT_STAT_ST_FLAGS
if (to_sb.st_flags & NOCHANGEBITS)
(void)chflags(to_name, to_sb.st_flags);
#endif
unlink(tempfile);
errno = serrno;
err(EX_OSERR, "unlink: %s", backup);
}
if (link(to_name, backup) < 0) {
serrno = errno;
unlink(tempfile);
#if HAVE_STRUCT_STAT_ST_FLAGS
if (to_sb.st_flags & NOCHANGEBITS)
(void)chflags(to_name, to_sb.st_flags);
#endif
errno = serrno;
err(EX_OSERR, "link: %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);
}
/*
* Preserve the timestamp of the source file if necessary.
*/
if (dopreserve && !files_match && !devnull) {
tsb[0] = from_sb.st_atim;
tsb[1] = from_sb.st_mtim;
(void)utimensat(AT_FDCWD, to_name, tsb, 0);
}
if (fstat(to_fd, &to_sb) == -1) {
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 (!dounpriv && ((gid != (gid_t)-1 && gid != to_sb.st_gid) ||
(uid != (uid_t)-1 && uid != to_sb.st_uid) ||
(mode != (to_sb.st_mode & ALLPERMS)))) {
#if HAVE_STRUCT_STAT_ST_FLAGS
/* Try to turn off the immutable bits. */
if (to_sb.st_flags & NOCHANGEBITS)
(void)fchflags(to_fd, to_sb.st_flags & ~NOCHANGEBITS);
#endif
}
if (!dounpriv && ((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,
dounpriv ? mode & (S_IRWXU|S_IRWXG|S_IRWXO) : mode)) {
serrno = errno;
(void)unlink(to_name);
errno = serrno;
err(EX_OSERR, "%s: chmod", to_name);
}
}
#if HAVE_STRUCT_STAT_ST_FLAGS
/*
* 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 fs doesn't support it, otherwise fail.
*/
if (!dounpriv && !devnull && (flags & SETFLAGS ||
(from_sb.st_flags & ~UF_NODUMP) != to_sb.st_flags) &&
fchflags(to_fd,
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);
}
}
}
#endif
(void)close(to_fd);
if (!devnull)
(void)close(from_fd);
metadata_log(to_name, "file", tsb, NULL, digestresult, to_sb.st_size);
free(digestresult);
}
/*
* compare --
* Compare two files; non-zero means files differ.
* Compute digest and return its address in *dresp
* unless it points to pre-computed digest.
*/
static 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 **dresp)
{
char *p, *q;
int rv;
int do_digest, done_compare;
DIGEST_CTX ctx;
rv = 0;
if (from_len != to_len)
return 1;
do_digest = (digesttype != DIGEST_NONE && dresp != NULL &&
*dresp == NULL);
if (from_len <= MAX_CMP_SIZE) {
if (do_digest)
digest_init(&ctx);
done_compare = 0;
if (trymmap(from_len) && trymmap(to_len)) {
p = mmap(NULL, from_len, PROT_READ, MAP_SHARED,
from_fd, (off_t)0);
if (p == MAP_FAILED)
goto out;
q = mmap(NULL, from_len, PROT_READ, MAP_SHARED,
to_fd, (off_t)0);
if (q == MAP_FAILED) {
munmap(p, from_len);
goto out;
}
rv = memcmp(p, q, from_len);
if (do_digest)
digest_update(&ctx, p, from_len);
munmap(p, from_len);
munmap(q, from_len);
done_compare = 1;
}
out:
if (!done_compare) {
static char *buf, *buf1, *buf2;
static size_t bufsize;
int n1, n2;
if (buf == NULL) {
/*
* Note that buf and bufsize are static. If
* malloc() fails, it will fail at the start
* and not copy only some files.
*/
if (sysconf(_SC_PHYS_PAGES) >
PHYSPAGES_THRESHOLD)
bufsize = MIN(BUFSIZE_MAX, MAXPHYS * 8);
else
bufsize = BUFSIZE_SMALL;
buf = malloc(bufsize * 2);
if (buf == NULL)
err(1, "Not enough memory");
buf1 = buf;
buf2 = buf + bufsize;
}
rv = 0;
lseek(from_fd, 0, SEEK_SET);
lseek(to_fd, 0, SEEK_SET);
while (rv == 0) {
n1 = read(from_fd, buf1, bufsize);
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 */
if (do_digest)
digest_update(&ctx, buf1, n1);
}
lseek(from_fd, 0, SEEK_SET);
lseek(to_fd, 0, SEEK_SET);
}
} else
rv = 1; /* don't bother in this case */
if (do_digest) {
if (rv == 0)
*dresp = digest_end(&ctx, NULL);
else
(void)digest_end(&ctx, NULL);
}
return rv;
}
/*
* create_tempfile --
* create a temporary file based on path and open it
*/
static 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@XXXXXX", &temp[tsize - 1] - p);
temp[tsize - 1] = '\0';
return (mkstemp(temp));
}
/*
* create_newfile --
* create a new file, overwriting an existing one if necessary
*/
static 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 HAVE_STRUCT_STAT_ST_FLAGS
if (sbp->st_flags & NOCHANGEBITS)
(void)chflags(path, sbp->st_flags & ~NOCHANGEBITS);
#endif
if (dobackup) {
if ((size_t)snprintf(backup, MAXPATHLEN, "%s%s",
path, suffix) != strlen(path) + strlen(suffix)) {
saved_errno = errno;
#if HAVE_STRUCT_STAT_ST_FLAGS
if (sbp->st_flags & NOCHANGEBITS)
(void)chflags(path, sbp->st_flags);
#endif
errno = saved_errno;
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) {
saved_errno = errno;
#if HAVE_STRUCT_STAT_ST_FLAGS
if (sbp->st_flags & NOCHANGEBITS)
(void)chflags(path, sbp->st_flags);
#endif
errno = saved_errno;
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;
}
/*
* copy --
* copy from one file to another
*/
static char *
copy(int from_fd, const char *from_name, int to_fd, const char *to_name,
off_t size)
{
static char *buf = NULL;
static size_t bufsize;
int nr, nw;
int serrno;
char *p;
int done_copy;
DIGEST_CTX ctx;
/* 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);
digest_init(&ctx);
done_copy = 0;
if (trymmap((size_t)size) &&
(p = mmap(NULL, (size_t)size, PROT_READ, MAP_SHARED,
from_fd, (off_t)0)) != MAP_FAILED) {
nw = write(to_fd, p, size);
if (nw != size) {
serrno = errno;
(void)unlink(to_name);
if (nw >= 0) {
errx(EX_OSERR,
"short write to %s: %jd bytes written, %jd bytes asked to write",
to_name, (uintmax_t)nw, (uintmax_t)size);
} else {
errno = serrno;
err(EX_OSERR, "%s", to_name);
}
}
digest_update(&ctx, p, size);
(void)munmap(p, size);
done_copy = 1;
}
if (!done_copy) {
if (buf == NULL) {
/*
* Note that buf and bufsize are static. If
* malloc() fails, it will fail at the start
* and not copy only some files.
*/
if (sysconf(_SC_PHYS_PAGES) >
PHYSPAGES_THRESHOLD)
bufsize = MIN(BUFSIZE_MAX, MAXPHYS * 8);
else
bufsize = BUFSIZE_SMALL;
buf = malloc(bufsize);
if (buf == NULL)
err(1, "Not enough memory");
}
while ((nr = read(from_fd, buf, bufsize)) > 0) {
if ((nw = write(to_fd, buf, nr)) != nr) {
serrno = errno;
(void)unlink(to_name);
if (nw >= 0) {
errx(EX_OSERR,
"short write to %s: %jd bytes written, %jd bytes asked to write",
to_name, (uintmax_t)nw,
(uintmax_t)size);
} else {
errno = serrno;
err(EX_OSERR, "%s", to_name);
}
}
digest_update(&ctx, buf, nr);
}
if (nr != 0) {
serrno = errno;
(void)unlink(to_name);
errno = serrno;
err(EX_OSERR, "%s", from_name);
}
}
if (safecopy && fsync(to_fd) == -1) {
serrno = errno;
(void)unlink(to_name);
errno = serrno;
err(EX_OSERR, "fsync failed for %s", to_name);
}
return (digest_end(&ctx, NULL));
}
/*
* strip --
* Use strip(1) to strip the target file.
* Just invoke strip(1) on to_name if from_name is NULL, else try
* to run "strip -o to_name from_name" and return 0 on failure.
* Return 1 on success and assign result of digest_file(to_name)
* to *dresp.
*/
static int
strip(const char *to_name, int to_fd, const char *from_name, char **dresp)
{
const char *stripbin;
const char *args[5];
char *prefixed_from_name;
pid_t pid;
int error, serrno, status;
prefixed_from_name = NULL;
stripbin = getenv("STRIPBIN");
if (stripbin == NULL)
stripbin = "strip";
args[0] = stripbin;
if (from_name == NULL) {
args[1] = to_name;
args[2] = NULL;
} else {
args[1] = "-o";
args[2] = to_name;
/* Prepend './' if from_name begins with '-' */
if (from_name[0] == '-') {
if (asprintf(&prefixed_from_name, "./%s", from_name) == -1)
return (0);
args[3] = prefixed_from_name;
} else {
args[3] = from_name;
}
args[4] = NULL;
}
error = posix_spawnp(&pid, stripbin, NULL, NULL,
__DECONST(char **, args), environ);
if (error != 0) {
(void)unlink(to_name);
errc(error == EAGAIN || error == EPROCLIM || error == ENOMEM ?
EX_TEMPFAIL : EX_OSERR, error, "spawn %s", stripbin);
}
free(prefixed_from_name);
if (waitpid(pid, &status, 0) == -1) {
error = errno;
(void)unlink(to_name);
errc(EX_SOFTWARE, error, "wait");
/* NOTREACHED */
}
if (status != 0) {
if (from_name != NULL)
return (0);
(void)unlink(to_name);
errx(EX_SOFTWARE, "strip command %s failed on %s",
stripbin, to_name);
}
if (from_name != NULL && safecopy && fsync(to_fd) == -1) {
serrno = errno;
(void)unlink(to_name);
errno = serrno;
err(EX_OSERR, "fsync failed for %s", to_name);
}
if (dresp != NULL)
*dresp = digest_file(to_name);
return (1);
}
/*
* install_dir --
* build directory hierarchy
*/
static void
install_dir(char *path)
{
char *p;
struct stat sb;
int ch, tried_mkdir;
for (p = path;; ++p)
if (!*p || (p != path && *p == '/')) {
tried_mkdir = 0;
ch = *p;
*p = '\0';
again:
if (stat(path, &sb) != 0) {
if (errno != ENOENT || tried_mkdir)
err(EX_OSERR, "stat %s", path);
if (mkdir(path, 0755) < 0) {
tried_mkdir = 1;
if (errno == EEXIST)
goto again;
err(EX_OSERR, "mkdir %s", path);
}
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 (!dounpriv) {
if ((gid != (gid_t)-1 || uid != (uid_t)-1) &&
chown(path, uid, gid))
warn("chown %u:%u %s", uid, gid, path);
/* XXXBED: should we do the chmod in the dounpriv case? */
if (chmod(path, mode))
warn("chmod %o %s", mode, path);
}
metadata_log(path, "dir", NULL, NULL, NULL, 0);
}
/*
* metadata_log --
* if metafp is not NULL, output mtree(8) full path name and settings to
* metafp, to allow permissions to be set correctly by other tools,
* or to allow integrity checks to be performed.
*/
static void
metadata_log(const char *path, const char *type, struct timespec *ts,
const char *slink, const char *digestresult, off_t size)
{
static const char extra[] = { ' ', '\t', '\n', '\\', '#', '\0' };
const char *p;
char *buf;
size_t destlen;
struct flock metalog_lock;
if (!metafp)
return;
/* Buffer for strsvis(3). */
buf = (char *)malloc(4 * strlen(path) + 1);
if (buf == NULL) {
warnx("%s", strerror(ENOMEM));
return;
}
/* Lock log file. */
metalog_lock.l_start = 0;
metalog_lock.l_len = 0;
metalog_lock.l_whence = SEEK_SET;
metalog_lock.l_type = F_WRLCK;
if (fcntl(fileno(metafp), F_SETLKW, &metalog_lock) == -1) {
warn("can't lock %s", metafile);
free(buf);
return;
}
/* Remove destdir. */
p = path;
if (destdir) {
destlen = strlen(destdir);
if (strncmp(p, destdir, destlen) == 0 &&
(p[destlen] == '/' || p[destlen] == '\0'))
p += destlen;
}
while (*p && *p == '/')
p++;
strsvis(buf, p, VIS_OCTAL, extra);
p = buf;
/* Print details. */
fprintf(metafp, ".%s%s type=%s", *p ? "/" : "", p, type);
if (owner)
fprintf(metafp, " uname=%s", owner);
if (group)
fprintf(metafp, " gname=%s", group);
fprintf(metafp, " mode=%#o", mode);
if (slink) {
strsvis(buf, slink, VIS_CSTYLE, extra); /* encode link */
fprintf(metafp, " link=%s", buf);
}
if (*type == 'f') /* type=file */
fprintf(metafp, " size=%lld", (long long)size);
if (ts != NULL && dopreserve)
fprintf(metafp, " time=%lld.%09ld",
(long long)ts[1].tv_sec, ts[1].tv_nsec);
if (digestresult && digest)
fprintf(metafp, " %s=%s", digest, digestresult);
if (fflags)
fprintf(metafp, " flags=%s", fflags);
if (tags)
fprintf(metafp, " tags=%s", tags);
fputc('\n', metafp);
/* Flush line. */
fflush(metafp);
/* Unlock log file. */
metalog_lock.l_type = F_UNLCK;
if (fcntl(fileno(metafp), F_SETLKW, &metalog_lock) == -1)
warn("can't unlock %s", metafile);
free(buf);
}
/*
* usage --
* print a usage message and die
*/
static void
usage(void)
{
(void)fprintf(stderr,
"usage: install [-bCcpSsUv] [-f flags] [-g group] [-m mode] [-o owner]\n"
" [-M log] [-D dest] [-h hash] [-T tags]\n"
" [-B suffix] [-l linkflags] [-N dbdir]\n"
" file1 file2\n"
" install [-bCcpSsUv] [-f flags] [-g group] [-m mode] [-o owner]\n"
" [-M log] [-D dest] [-h hash] [-T tags]\n"
" [-B suffix] [-l linkflags] [-N dbdir]\n"
" file1 ... fileN directory\n"
" install -dU [-vU] [-g group] [-m mode] [-N dbdir] [-o owner]\n"
" [-M log] [-D dest] [-h hash] [-T tags]\n"
" directory ...\n");
exit(EX_USAGE);
/* NOTREACHED */
}
/*
* trymmap --
* return true (1) if mmap should be tried, false (0) if not.
*/
static int
trymmap(size_t filesize)
{
/*
* This function existed to skip mmap() for NFS file systems whereas
* nowadays mmap() should be perfectly safe. Nevertheless, using mmap()
* only reduces the number of system calls if we need multiple read()
* syscalls, i.e. if the file size is > MAXBSIZE. However, mmap() is
* more expensive than read() so set the threshold at 4 fewer syscalls.
* Additionally, for larger file size mmap() can significantly increase
* the number of page faults, so avoid it in that case.
*
* Note: the 8MB limit is not based on any meaningful benchmarking
* results, it is simply reusing the same value that was used before
* and also matches bin/cp.
*
* XXX: Maybe we shouldn't bother with mmap() at all, since we use
* MAXBSIZE the syscall overhead of read() shouldn't be too high?
*/
return (filesize > 4 * MAXBSIZE && filesize < 8 * 1024 * 1024);
}
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