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/* $OpenBSD: ttyflags.c,v 1.16 2021/10/24 21:24:22 deraadt Exp $ */
/* $NetBSD: ttyflags.c,v 1.8 1996/04/09 05:20:30 cgd Exp $ */
/*
* Copyright (c) 1996 Theo de Raadt
* Copyright (c) 1994 Christopher G. Demetriou
* 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 Christopher G. Demetriou.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
#include <sys/types.h>
#include <sys/ioctl.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ttyent.h>
#include <unistd.h>
int all(int);
int ttys(char **, int);
int ttyflags(struct ttyent *, int);
void usage(void);
int nflag, vflag;
/*
* Ttyflags sets the device-specific tty flags, based on the contents
* of /etc/ttys. It can either set all of the ttys' flags, or set
* the flags of the ttys specified on the command line.
*/
int
main(int argc, char *argv[])
{
int aflag, ch, rval, pflag = 0;
aflag = nflag = vflag = 0;
while ((ch = getopt(argc, argv, "panv")) != -1)
switch (ch) {
case 'a':
aflag = 1;
break;
case 'n': /* undocumented */
nflag = 1;
break;
case 'p':
pflag = 1;
break;
case 'v':
vflag = 1;
break;
case '?':
default:
usage();
}
argc -= optind;
argv += optind;
if (aflag && argc != 0)
usage();
if (setttyent() == 0)
err(1, "setttyent");
if (aflag)
rval = all(pflag);
else
rval = ttys(argv, pflag);
if (endttyent() == 0)
warn("endttyent");
exit(rval);
}
/*
* Change all /etc/ttys entries' flags.
*/
int
all(int print)
{
struct ttyent *tep;
int rval;
rval = 0;
for (tep = getttyent(); tep != NULL; tep = getttyent()) {
/* pseudo-tty ignore TIOCSFLAGS, so don't bother */
if (tep->ty_type == NULL ||
strcmp(tep->ty_type, "network") == 0)
continue;
if (ttyflags(tep, print))
rval = 1;
}
return (rval);
}
/*
* Change the specified ttys' flags.
*/
int
ttys(char **ttylist, int print)
{
struct ttyent *tep;
int rval;
rval = 0;
for (; *ttylist != NULL; ttylist++) {
tep = getttynam(*ttylist);
if (tep == NULL) {
warnx("couldn't find an entry in %s for \"%s\"",
_PATH_TTYS, *ttylist);
rval = 1;
continue;
}
if (ttyflags(tep, print))
rval = 1;
}
return (rval);
}
/*
* Actually do the work; find out what the new flags value should be,
* open the device, and change the flags.
*/
int
ttyflags(struct ttyent *tep, int print)
{
int fd, flags = 0, rval = 0, st, sep = 0;
char path[PATH_MAX];
char strflags[256];
st = tep->ty_status;
strflags[0] = '\0';
/* Find the full device path name. */
(void)snprintf(path, sizeof path, "%s%s", _PATH_DEV, tep->ty_name);
if (print == 0) {
/* Convert ttyent.h flags into ioctl flags. */
if (st & TTY_LOCAL) {
flags |= TIOCFLAG_CLOCAL;
(void)strlcat(strflags, "local", sizeof strflags);
sep++;
}
if (st & TTY_RTSCTS) {
flags |= TIOCFLAG_CRTSCTS;
if (sep++)
(void)strlcat(strflags, "|", sizeof strflags);
(void)strlcat(strflags, "rtscts", sizeof strflags);
}
if (st & TTY_SOFTCAR) {
flags |= TIOCFLAG_SOFTCAR;
if (sep++)
(void)strlcat(strflags, "|", sizeof strflags);
(void)strlcat(strflags, "softcar", sizeof strflags);
}
if (st & TTY_MDMBUF) {
flags |= TIOCFLAG_MDMBUF;
if (sep++)
(void)strlcat(strflags, "|", sizeof strflags);
(void)strlcat(strflags, "mdmbuf", sizeof strflags);
}
if (vflag)
printf("%s setting flags to: %s\n", path, strflags);
}
if (nflag)
return (0);
/* Open the device NON-BLOCKING, set the flags, and close it. */
if ((fd = open(path, O_RDONLY | O_NONBLOCK)) == -1) {
if (!(errno == ENXIO ||
(errno == ENOENT && (st & TTY_ON) == 0)))
rval = 1;
if (vflag)
warn("open %s", path);
return (rval);
}
if (print == 0) {
if (ioctl(fd, TIOCSFLAGS, &flags) == -1)
if (errno != ENOTTY || vflag) {
warn("TIOCSFLAGS on %s", path);
rval = (errno != ENOTTY);
}
} else {
if (ioctl(fd, TIOCGFLAGS, &flags) == -1)
if (errno != ENOTTY || vflag) {
warn("TIOCGFLAGS on %s", path);
rval = (errno != ENOTTY);
}
if (flags & TIOCFLAG_CLOCAL) {
(void)strlcat(strflags, "local", sizeof strflags);
sep++;
}
if (flags & TIOCFLAG_CRTSCTS) {
if (sep++)
(void)strlcat(strflags, "|", sizeof strflags);
(void)strlcat(strflags, "rtscts", sizeof strflags);
}
if (flags & TIOCFLAG_SOFTCAR) {
if (sep++)
(void)strlcat(strflags, "|", sizeof strflags);
(void)strlcat(strflags, "softcar", sizeof strflags);
}
if (flags & TIOCFLAG_MDMBUF) {
if (sep++)
(void)strlcat(strflags, "|", sizeof strflags);
(void)strlcat(strflags, "mdmbuf", sizeof strflags);
}
printf("%s flags are: %s\n", path, strflags);
}
if (close(fd) == -1) {
warn("close %s", path);
return (1);
}
return (rval);
}
/*
* Print usage information when a bogus set of arguments is given.
*/
void
usage(void)
{
(void)fprintf(stderr, "usage: ttyflags [-pv] [-a | tty ...]\n");
exit(1);
}
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