1/* $NetBSD: ttyflags.c,v 1.17 2008/07/20 01:20:23 lukem Exp $ */
2
3/*
4 * Copyright (c) 1994 Christopher G. Demetriou
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 *    must display the following acknowledgement:
17 *          This product includes software developed for the
18 *          NetBSD Project.  See http://www.NetBSD.org/ for
19 *          information about NetBSD.
20 * 4. The name of the author may not be used to endorse or promote products
21 *    derived from this software without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
26 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
32 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 *
34 * <<Id: LICENSE,v 1.2 2000/06/14 15:57:33 cgd Exp>>
35 */
36
37#include <sys/cdefs.h>
38#ifndef lint
39__COPYRIGHT("@(#) Copyright (c) 1994\
40 Christopher G. Demetriou.  All rights reserved.");
41#endif /* not lint */
42
43#ifndef lint
44__RCSID("$NetBSD: ttyflags.c,v 1.17 2008/07/20 01:20:23 lukem Exp $");
45#endif /* not lint */
46
47#include <sys/types.h>
48#include <sys/ioctl.h>
49
50#include <err.h>
51#include <errno.h>
52#include <fcntl.h>
53#include <limits.h>
54#include <paths.h>
55#include <stdio.h>
56#include <stdlib.h>
57#include <string.h>
58#include <ttyent.h>
59#include <unistd.h>
60
61static int change_all(void);
62static int change_ttyflags(struct ttyent *);
63static int change_ttys(char **);
64__dead static void usage(void);
65
66static int nflag, vflag;
67
68/*
69 * Ttyflags sets the device-specific tty flags, based on the contents
70 * of /etc/ttys.  It can either set all of the ttys' flags, or set
71 * the flags of the ttys specified on the command line.
72 */
73int
74main(int argc, char *argv[])
75{
76	int aflag, ch, rval;
77
78	aflag = nflag = vflag = 0;
79	while ((ch = getopt(argc, argv, "anv")) != -1)
80		switch (ch) {
81		case 'a':
82			aflag = 1;
83			break;
84		case 'n':		/* undocumented */
85			nflag = 1;
86			break;
87		case 'v':
88			vflag = 1;
89			break;
90		case '?':
91		default:
92			usage();
93		}
94	argc -= optind;
95	argv += optind;
96
97	if (aflag && argc != 0)
98		usage();
99
100	rval = 0;
101
102	if (setttyent() == 0)
103		err(1, "setttyent");
104
105	if (aflag)
106		rval = change_all();
107	else
108		rval = change_ttys(argv);
109
110	if (endttyent() == 0)
111		warn("endttyent");
112
113	exit(rval);
114}
115
116/*
117 * Change all /etc/ttys entries' flags.
118 */
119static int
120change_all(void)
121{
122	struct ttyent *tep;
123	int rval;
124
125	rval = 0;
126	for (tep = getttyent(); tep != NULL; tep = getttyent())
127		if (change_ttyflags(tep))
128			rval = 1;
129	return (rval);
130}
131
132/*
133 * Change the specified ttys' flags.
134 */
135static int
136change_ttys(char **ttylist)
137{
138	struct ttyent *tep;
139	int rval;
140
141	rval = 0;
142	for (; *ttylist != NULL; ttylist++) {
143		tep = getttynam(*ttylist);
144		if (tep == NULL) {
145			warnx("couldn't find an entry in %s for \"%s\"",
146			    _PATH_TTYS, *ttylist);
147			rval = 1;
148			continue;
149		}
150
151		if (change_ttyflags(tep))
152			rval = 1;
153	}
154	return (rval);
155}
156
157
158/*
159 * Actually do the work; find out what the new flags value should be,
160 * open the device, and change the flags.
161 */
162static int
163change_ttyflags(struct ttyent *tep)
164{
165	int fd, flags, rval, st, sep;
166	char path[PATH_MAX];
167	char strflags[256];
168
169	st = tep->ty_status;
170	sep = flags = rval = 0;
171	strflags[0] = '\0';
172
173
174	/* Convert ttyent.h flags into ioctl flags. */
175	if (st & TTY_LOCAL) {
176		flags |= TIOCFLAG_CLOCAL;
177		(void)strlcat(strflags, "local", sizeof(strflags));
178		sep++;
179	}
180	if (st & TTY_RTSCTS) {
181		flags |= TIOCFLAG_CRTSCTS;
182		if (sep++)
183			(void)strlcat(strflags, "|", sizeof(strflags));
184		(void)strlcat(strflags, "rtscts", sizeof(strflags));
185	}
186	if (st & TTY_DTRCTS) {
187		flags |= TIOCFLAG_CDTRCTS;
188		if (sep++)
189			(void)strlcat(strflags, "|", sizeof(strflags));
190		(void)strlcat(strflags, "dtrcts", sizeof(strflags));
191	}
192	if (st & TTY_SOFTCAR) {
193		flags |= TIOCFLAG_SOFTCAR;
194		if (sep++)
195			(void)strlcat(strflags, "|", sizeof(strflags));
196		(void)strlcat(strflags, "softcar", sizeof(strflags));
197	}
198	if (st & TTY_MDMBUF) {
199		flags |= TIOCFLAG_MDMBUF;
200		if (sep++)
201			(void)strlcat(strflags, "|", sizeof(strflags));
202		(void)strlcat(strflags, "mdmbuf", sizeof(strflags));
203	}
204
205	if (strflags[0] == '\0')
206		(void)strlcpy(strflags, "none", sizeof(strflags));
207
208	/* Find the full device path name. */
209	(void)snprintf(path, sizeof path, "%s%s", _PATH_DEV, tep->ty_name);
210
211	if (vflag)
212		warnx("setting flags on %s to %s", path, strflags);
213	if (nflag)
214		return (0);
215
216	/* Open the device NON-BLOCKING, set the flags, and close it. */
217	if ((fd = open(path, O_RDONLY | O_NONBLOCK, 0)) == -1) {
218		if (!(errno == ENXIO ||
219		      (errno == ENOENT && (st & TTY_ON) == 0)))
220			rval = 1;
221		if (rval || vflag)
222			warn("open %s", path);
223		return (rval);
224	}
225	if (ioctl(fd, TIOCSFLAGS, &flags) == -1)
226		if (errno != ENOTTY || vflag) {
227			warn("TIOCSFLAGS on %s", path);
228			rval = (errno != ENOTTY);
229		}
230	if (close(fd) == -1) {
231		warn("close %s", path);
232		return (1);
233	}
234	return (rval);
235}
236
237/*
238 * Print usage information when a bogus set of arguments is given.
239 */
240static void
241usage(void)
242{
243	(void)fprintf(stderr, "usage: ttyflags [-v] [-a | tty ... ]\n");
244	exit(1);
245}
246