/* $NetBSD: ttyflags.c,v 1.19 2014/05/04 20:43:30 mrg Exp $ */

/*
 * 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 for the
 *          NetBSD Project.  See http://www.NetBSD.org/ for
 *          information about NetBSD.
 * 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.
 * 
 * <<Id: LICENSE,v 1.2 2000/06/14 15:57:33 cgd Exp>>
 */

#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1994\
 Christopher G. Demetriou.  All rights reserved.");
#endif /* not lint */

#ifndef lint
__RCSID("$NetBSD: ttyflags.c,v 1.19 2014/05/04 20:43:30 mrg Exp $");
#endif /* not lint */

#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>

static int change_all(void);
static int change_ttyflags(struct ttyent *);
static int change_ttys(char **);
__dead static void usage(void);

static 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;

        aflag = nflag = vflag = 0;
        while ((ch = getopt(argc, argv, "anv")) != -1)
                switch (ch) {
                case 'a':
                        aflag = 1;
                        break;
                case 'n':               /* undocumented */
                        nflag = 1;
                        break;
                case 'v':
                        vflag = 1;
                        break;
                case '?':
                default:
                        usage();
                }
        argc -= optind;
        argv += optind;

        if (aflag && argc != 0)
                usage();

        rval = 0;

        if (setttyent() == 0)
                err(1, "setttyent");

        if (aflag)
                rval = change_all();
        else
                rval = change_ttys(argv);

        if (endttyent() == 0)
                warn("endttyent");

        exit(rval);
}

/*
 * Change all /etc/ttys entries' flags.
 */
static int
change_all(void)
{
        struct ttyent *tep;
        int rval;

        rval = 0;
        for (tep = getttyent(); tep != NULL; tep = getttyent())
                if (change_ttyflags(tep))
                        rval = 1;
        return (rval);
}

/*
 * Change the specified ttys' flags.
 */
static int
change_ttys(char **ttylist)
{
        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 (change_ttyflags(tep))
                        rval = 1;
        }
        return (rval);
}


/*
 * Actually do the work; find out what the new flags value should be,
 * open the device, and change the flags.
 */
static int
change_ttyflags(struct ttyent *tep)
{
        int fd, flags, rval, st, sep;
        char path[PATH_MAX];
        char strflags[256];

        st = tep->ty_status;
        sep = flags = rval = 0;
        strflags[0] = '\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_DTRCTS) {
                flags |= TIOCFLAG_CDTRCTS;
                if (sep++)
                        (void)strlcat(strflags, "|", sizeof(strflags));
                (void)strlcat(strflags, "dtrcts", 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 (strflags[0] == '\0')
                (void)strlcpy(strflags, "none", sizeof(strflags));

        /* Find the full device path name. */
        (void)snprintf(path, sizeof path, "%s%s", _PATH_DEV, tep->ty_name);

        if (vflag)
                warnx("setting flags on %s to %s", path, strflags);
        if (nflag)
                return (0);

        /* Open the device NON-BLOCKING, set the flags, and close it. */
        if ((fd = open(path, O_RDWR | O_NONBLOCK, 0)) == -1) {
                if (!(errno == ENXIO ||
                      (errno == ENOENT && (st & TTY_ON) == 0)))
                        rval = 1;
                if (rval || vflag)
                        warn("open %s", path);
                return (rval);
        }
        if (ioctl(fd, TIOCSFLAGS, &flags) == -1)
                if (errno != ENOTTY || vflag) {
                        warn("TIOCSFLAGS on %s", path);
                        rval = (errno != ENOTTY);
                }
        if (close(fd) == -1) {
                warn("close %s", path);
                return (1);
        }
        return (rval);
}

/*
 * Print usage information when a bogus set of arguments is given.
 */
static void
usage(void)
{
        (void)fprintf(stderr, "usage: ttyflags [-v] [-a | tty ... ]\n");
        exit(1);
}