/*
* Copyright (c) 1987 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
char copyright[] =
"@(#) Copyright (c) 1987 Regents of the University of California.\n\
All rights reserved.\n";
#endif /* not lint */
#ifndef lint
/*static char sccsid[] = "from: @(#)vipw.c 5.16 (Berkeley) 3/3/91";*/
static char rcsid[] = "vipw.c,v 1.1.1.1 1995/02/22 19:09:25 faith Exp";
#endif /* not lint */
#include <sys/types.h>
#include <sys/stat.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/param.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <sys/resource.h>
#include <sys/file.h>
#include <signal.h>
#include <fcntl.h>
#include <errno.h>
#include <paths.h>
#include <unistd.h>
#include "pathnames.h"
char *progname = "vipw";
void pw_error __P((char *, int, int));
copyfile(from, to)
register int from, to;
{
register int nr, nw, off;
char buf[8*1024];
while ((nr = read(from, buf, sizeof(buf))) > 0)
for (off = 0; off < nr; nr -= nw, off += nw)
if ((nw = write(to, buf + off, nr)) < 0)
pw_error(_PATH_PTMP, 1, 1);
if (nr < 0)
pw_error(_PATH_PASSWD, 1, 1);
}
void
pw_init()
{
struct rlimit rlim;
/* Unlimited resource limits. */
rlim.rlim_cur = rlim.rlim_max = RLIM_INFINITY;
(void)setrlimit(RLIMIT_CPU, &rlim);
(void)setrlimit(RLIMIT_FSIZE, &rlim);
(void)setrlimit(RLIMIT_STACK, &rlim);
(void)setrlimit(RLIMIT_DATA, &rlim);
(void)setrlimit(RLIMIT_RSS, &rlim);
/* Don't drop core (not really necessary, but GP's). */
rlim.rlim_cur = rlim.rlim_max = 0;
(void)setrlimit(RLIMIT_CORE, &rlim);
/* Turn off signals. */
(void)signal(SIGALRM, SIG_IGN);
(void)signal(SIGHUP, SIG_IGN);
(void)signal(SIGINT, SIG_IGN);
(void)signal(SIGPIPE, SIG_IGN);
(void)signal(SIGQUIT, SIG_IGN);
(void)signal(SIGTERM, SIG_IGN);
(void)signal(SIGTSTP, SIG_IGN);
(void)signal(SIGTTOU, SIG_IGN);
/* Create with exact permissions. */
(void)umask(0);
}
int
pw_lock()
{
static char path[MAXPATHLEN] = _PATH_PTMP;
int lockfd, fd, ret;
char *p;
/*
* If the password file doesn't exist, the system is hosed.
* Might as well try to build one. Set the close-on-exec bit so
* that users can't get at the encrypted passwords while editing.
* Open should allow flock'ing the file; see 4.4BSD. XXX
*/
lockfd = open(_PATH_PASSWD, O_RDONLY, 0);
if (lockfd < 0) {
(void)fprintf(stderr, "%s: %s: %s\n",
progname, _PATH_PASSWD, strerror(errno));
exit(1);
}
if (flock(lockfd, LOCK_EX|LOCK_NB)) {
(void)fprintf(stderr,
"%s: the password file is busy.\n", progname);
exit(1);
}
if ((fd = open(_PATH_PTMPTMP, O_WRONLY|O_CREAT, 0644)) == -1) {
(void)fprintf(stderr,
"%s: %s: %s\n", progname, _PATH_PTMPTMP, strerror(errno));
exit(1);
}
ret = link(_PATH_PTMPTMP, _PATH_PTMP);
(void)unlink(_PATH_PTMPTMP);
if (ret == -1) {
if (errno == EEXIST)
(void)fprintf(stderr,
"%s: the password file is busy\n", progname);
else
(void)fprintf(stderr, "%s: can't link %s: %s\n", progname,
_PATH_PTMP, strerror(errno));
exit(1);
}
copyfile(lockfd, fd);
(void)close(lockfd);
(void)close(fd);
return(1);
}
void
pw_unlock()
{
(void)unlink(_PATH_PASSWD);
if (link(_PATH_PTMP, _PATH_PASSWD) == -1) {
(void)fprintf(stderr,
"%s: can't unlock %s: %s (your changes are still in %s)\n",
progname, _PATH_PASSWD, strerror(errno), _PATH_PTMP);
exit(1);
}
(void)unlink(_PATH_PTMP);
}
void
pw_edit(notsetuid)
int notsetuid;
{
int pstat;
pid_t pid;
char *p, *editor;
if (!(editor = getenv("EDITOR")))
editor = _PATH_VI;
if ((p = strrchr(editor, '/')) != NULL)
++p;
else
p = editor;
if (!(pid = vfork())) {
if (notsetuid) {
(void)setgid(getgid());
(void)setuid(getuid());
}
execlp(editor, p, _PATH_PTMP, NULL);
_exit(1);
}
for (;;) {
pid = waitpid(pid, &pstat, WUNTRACED);
if (WIFSTOPPED(pstat)) {
/* the editor suspended, so suspend us as well */
kill(getpid(), SIGSTOP);
kill(pid, SIGCONT);
} else {
break;
}
}
if (pid == -1 || !WIFEXITED(pstat) || WEXITSTATUS(pstat) != 0)
pw_error(editor, 1, 1);
}
void
pw_error(name, err, eval)
char *name;
int err, eval;
{
int sverrno;
if (err) {
sverrno = errno;
(void)fprintf(stderr, "%s: ", progname);
if (name)
(void)fprintf(stderr, "%s: ", name);
(void)fprintf(stderr, "%s\n", strerror(sverrno));
}
(void)fprintf(stderr,
"%s: %s unchanged\n", progname, _PATH_PASSWD);
(void)unlink(_PATH_PTMP);
exit(eval);
}
main()
{
register int pfd, tfd;
struct stat begin, end;
pw_init();
pw_lock();
if (stat(_PATH_PTMP, &begin))
pw_error(_PATH_PTMP, 1, 1);
pw_edit(0);
if (stat(_PATH_PTMP, &end))
pw_error(_PATH_PTMP, 1, 1);
if (begin.st_mtime == end.st_mtime) {
(void)fprintf(stderr, "vipw: no changes made\n");
pw_error((char *)NULL, 0, 0);
}
pw_unlock();
exit(0);
}
