RetroZilla/security/coreconf/nsinstall/nsinstall.c

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2015-10-21 05:03:22 +02:00
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is the Netscape security libraries.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1994-2000
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/*
** Netscape portable install command.
*/
#include <stdio.h> /* OSF/1 requires this before grp.h, so put it first */
#include <assert.h>
#include <fcntl.h>
#include <string.h>
#if defined(_WINDOWS)
#include <windows.h>
typedef unsigned int mode_t;
#else
#include <grp.h>
#include <pwd.h>
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#include <utime.h>
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include "pathsub.h"
#define HAVE_LCHOWN
#if defined(AIX) || defined(BSDI) || defined(HPUX) || defined(LINUX) || defined(SUNOS4) || defined(SCO) || defined(UNIXWARE) || defined(VMS) || defined(NTO) || defined(DARWIN) || defined(BEOS) || defined(__riscos__)
#undef HAVE_LCHOWN
#endif
#define HAVE_FCHMOD
#if defined(BEOS)
#undef HAVE_FCHMOD
#endif
#ifdef LINUX
#include <getopt.h>
#endif
#if defined(SCO) || defined(UNIXWARE) || defined(SNI) || defined(NCR) || defined(NEC)
#if !defined(S_ISLNK) && defined(S_IFLNK)
#define S_ISLNK(a) (((a) & S_IFMT) == S_IFLNK)
#endif
#endif
#if defined(SNI)
extern int fchmod(int fildes, mode_t mode);
#endif
#ifdef GETCWD_CANT_MALLOC
/*
* this should probably go into a utility library in case other applications
* need it.
*/
static char *
getcwd_do_malloc(char *path, int len) {
if (!path) {
path = malloc(PATH_MAX +1);
if (!path) return NULL;
}
return getcwd(path, PATH_MAX);
}
#define GETCWD getcwd_do_malloc
#else
#define GETCWD getcwd
#endif
static void
usage(void)
{
fprintf(stderr,
"usage: %s [-C cwd] [-L linkprefix] [-m mode] [-o owner] [-g group]\n"
" %*s [-DdltR] file [file ...] directory\n",
program, (int)strlen(program), "");
exit(2);
}
/* this is more-or-less equivalent to mkdir -p */
static int
mkdirs(char *path, mode_t mode)
{
char * cp;
int rv;
struct stat sb;
if (!path || !path[0])
fail("Null pointer or empty string passed to mkdirs()");
while (*path == '/' && path[1] == '/')
path++;
for (cp = strrchr(path, '/'); cp && cp != path && *(cp - 1) == '/'; cp--);
if (cp && cp != path) {
*cp = '\0';
if ((stat(path, &sb) < 0 || !S_ISDIR(sb.st_mode)) &&
mkdirs(path, mode) < 0) {
return -1;
}
*cp = '/';
}
rv = mkdir(path, mode);
if (rv) {
if (errno != EEXIST)
fail("mkdirs cannot make %s", path);
fprintf(stderr, "directory creation race: %s\n", path);
if (!stat(path, &sb) && S_ISDIR(sb.st_mode))
rv = 0;
}
return rv;
}
static uid_t
touid(char *owner)
{
struct passwd *pw;
uid_t uid;
char *cp;
if (!owner || !owner[0])
fail("Null pointer or empty string passed to touid()");
pw = getpwnam(owner);
if (pw)
return pw->pw_uid;
uid = strtol(owner, &cp, 0);
if (uid == 0 && cp == owner)
fail("cannot find uid for %s", owner);
return uid;
}
static gid_t
togid(char *group)
{
struct group *gr;
gid_t gid;
char *cp;
if (!group || !group[0])
fail("Null pointer or empty string passed to togid()");
gr = getgrnam(group);
if (gr)
return gr->gr_gid;
gid = strtol(group, &cp, 0);
if (gid == 0 && cp == group)
fail("cannot find gid for %s", group);
return gid;
}
void * const uninit = (void *)0xdeadbeef;
int
main(int argc, char **argv)
{
char * base = uninit;
char * bp = uninit;
char * cp = uninit;
char * cwd = 0;
char * group = 0;
char * linkname = 0;
char * linkprefix = 0;
char * name = uninit;
char * owner = 0;
char * todir = uninit;
char * toname = uninit;
int bnlen = -1;
int cc = 0;
int dodir = 0;
int dolink = 0;
int dorelsymlink = 0;
int dotimes = 0;
int exists = 0;
int fromfd = -1;
int len = -1;
int lplen = 0;
int onlydir = 0;
int opt = -1;
int tdlen = -1;
int tofd = -1;
int wc = -1;
mode_t mode = 0755;
uid_t uid = -1;
gid_t gid = -1;
struct stat sb;
struct stat tosb;
struct utimbuf utb;
char buf[BUFSIZ];
program = strrchr(argv[0], '/');
if (!program)
program = strrchr(argv[0], '\\');
program = program ? program+1 : argv[0];
while ((opt = getopt(argc, argv, "C:DdlL:Rm:o:g:t")) != EOF) {
switch (opt) {
case 'C': cwd = optarg; break;
case 'D': onlydir = 1; break;
case 'd': dodir = 1; break;
case 'l': dolink = 1; break;
case 'L':
linkprefix = optarg;
lplen = strlen(linkprefix);
dolink = 1;
break;
case 'R': dolink = dorelsymlink = 1; break;
case 'm':
mode = strtoul(optarg, &cp, 8);
if (mode == 0 && cp == optarg)
usage();
break;
case 'o': owner = optarg; break;
case 'g': group = optarg; break;
case 't': dotimes = 1; break;
default: usage();
}
}
argc -= optind;
argv += optind;
if (argc < 2 - onlydir)
usage();
todir = argv[argc-1];
if ((stat(todir, &sb) < 0 || !S_ISDIR(sb.st_mode)) &&
mkdirs(todir, 0777) < 0) {
fail("cannot mkdir -p %s", todir);
}
if (onlydir)
return 0;
if (!cwd) {
cwd = GETCWD(0, PATH_MAX);
if (!cwd)
fail("could not get CWD");
}
/* make sure we can get into todir. */
xchdir(todir);
todir = GETCWD(0, PATH_MAX);
if (!todir)
fail("could not get CWD in todir");
tdlen = strlen(todir);
/* back to original directory. */
xchdir(cwd);
uid = owner ? touid(owner) : -1;
gid = group ? togid(group) : -1;
while (--argc > 0) {
name = *argv++;
len = strlen(name);
base = xbasename(name);
bnlen = strlen(base);
toname = (char*)xmalloc(tdlen + 1 + bnlen + 1);
sprintf(toname, "%s/%s", todir, base);
retry:
exists = (lstat(toname, &tosb) == 0);
if (dodir) {
/* -d means create a directory, always */
if (exists && !S_ISDIR(tosb.st_mode)) {
int rv = unlink(toname);
if (rv)
fail("cannot unlink %s", toname);
exists = 0;
}
if (!exists && mkdir(toname, mode) < 0) {
/* we probably have two nsinstall programs in a race here. */
if (errno == EEXIST && !stat(toname, &sb) &&
S_ISDIR(sb.st_mode)) {
fprintf(stderr, "directory creation race: %s\n", toname);
goto retry;
}
fail("cannot make directory %s", toname);
}
if ((owner || group) && chown(toname, uid, gid) < 0)
fail("cannot change owner of %s", toname);
} else if (dolink) {
if (*name == '/') {
/* source is absolute pathname, link to it directly */
linkname = 0;
} else {
if (linkprefix) {
/* -L implies -l and prefixes names with a $cwd arg. */
len += lplen + 1;
linkname = (char*)xmalloc(len + 1);
sprintf(linkname, "%s/%s", linkprefix, name);
} else if (dorelsymlink) {
/* Symlink the relative path from todir to source name. */
linkname = (char*)xmalloc(PATH_MAX);
if (*todir == '/') {
/* todir is absolute: skip over common prefix. */
lplen = relatepaths(todir, cwd, linkname);
strcpy(linkname + lplen, name);
} else {
/* todir is named by a relative path: reverse it. */
reversepath(todir, name, len, linkname);
xchdir(cwd);
}
len = strlen(linkname);
}
name = linkname;
}
/* Check for a pre-existing symlink with identical content. */
if (exists &&
(!S_ISLNK(tosb.st_mode) ||
readlink(toname, buf, sizeof buf) != len ||
strncmp(buf, name, len) != 0)) {
int rmrv;
rmrv = (S_ISDIR(tosb.st_mode) ? rmdir : unlink)(toname);
if (rmrv < 0) {
fail("destination exists, cannot remove %s", toname);
}
exists = 0;
}
if (!exists && symlink(name, toname) < 0) {
if (errno == EEXIST) {
fprintf(stderr, "symlink creation race: %s\n", toname);
fail("symlink was attempted in working directory %s "
"from %s to %s.\n", cwd, name, toname);
goto retry;
}
diagnosePath(toname);
fail("cannot make symbolic link %s", toname);
}
#ifdef HAVE_LCHOWN
if ((owner || group) && lchown(toname, uid, gid) < 0)
fail("cannot change owner of %s", toname);
#endif
if (linkname) {
free(linkname);
linkname = 0;
}
} else {
/* Copy from name to toname, which might be the same file. */
fromfd = open(name, O_RDONLY);
if (fromfd < 0 || fstat(fromfd, &sb) < 0)
fail("cannot access %s", name);
if (exists &&
(!S_ISREG(tosb.st_mode) || access(toname, W_OK) < 0)) {
int rmrv;
rmrv = (S_ISDIR(tosb.st_mode) ? rmdir : unlink)(toname);
if (rmrv < 0) {
fail("destination exists, cannot remove %s", toname);
}
}
tofd = open(toname, O_CREAT | O_WRONLY, 0666);
if (tofd < 0)
fail("cannot create %s", toname);
bp = buf;
while ((cc = read(fromfd, bp, sizeof buf)) > 0) {
while ((wc = write(tofd, bp, cc)) > 0) {
if ((cc -= wc) == 0)
break;
bp += wc;
}
if (wc < 0)
fail("cannot write to %s", toname);
}
if (cc < 0)
fail("cannot read from %s", name);
if (ftruncate(tofd, sb.st_size) < 0)
fail("cannot truncate %s", toname);
/*
** On OpenVMS we can't chmod() until the file is closed, and we
** have to utime() last since fchown/chmod alter the timestamps.
*/
#ifndef VMS
if (dotimes) {
utb.actime = sb.st_atime;
utb.modtime = sb.st_mtime;
if (utime(toname, &utb) < 0)
fail("cannot set times of %s", toname);
}
#ifdef HAVE_FCHMOD
if (fchmod(tofd, mode) < 0)
#else
if (chmod(toname, mode) < 0)
#endif
fail("cannot change mode of %s", toname);
#endif
if ((owner || group) && fchown(tofd, uid, gid) < 0)
fail("cannot change owner of %s", toname);
/* Must check for delayed (NFS) write errors on close. */
if (close(tofd) < 0)
fail("close reports write error on %s", toname);
close(fromfd);
#ifdef VMS
if (chmod(toname, mode) < 0)
fail("cannot change mode of %s", toname);
if (dotimes) {
utb.actime = sb.st_atime;
utb.modtime = sb.st_mtime;
if (utime(toname, &utb) < 0)
fail("cannot set times of %s", toname);
}
#endif
}
free(toname);
}
free(cwd);
free(todir);
return 0;
}