1/*-
2 * Copyright (c) 1982, 1986, 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)tty_tty.c 8.2 (Berkeley) 9/23/93
| 1/*-
2 * Copyright (c) 1982, 1986, 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)tty_tty.c 8.2 (Berkeley) 9/23/93
|
48#include <sys/kernel.h>
49#ifdef DEVFS
50#include <sys/devfsext.h>
51#endif /*DEVFS*/
52
53static d_open_t cttyopen;
54static d_read_t cttyread;
55static d_write_t cttywrite;
56static d_ioctl_t cttyioctl;
57static d_select_t cttyselect;
58
59#define CDEV_MAJOR 1
60/* Don't make static, fdesc_vnops uses this. */
61struct cdevsw ctty_cdevsw =
62 { cttyopen, nullclose, cttyread, cttywrite, /*1*/
63 cttyioctl, nullstop, nullreset, nodevtotty,/* tty */
64 cttyselect, nommap, NULL, "ctty", NULL, -1 };
65
66
67#define cttyvp(p) ((p)->p_flag & P_CONTROLT ? (p)->p_session->s_ttyvp : NULL)
68
69/*ARGSUSED*/
70static int
71cttyopen(dev, flag, mode, p)
72 dev_t dev;
73 int flag, mode;
74 struct proc *p;
75{
76 struct vnode *ttyvp = cttyvp(p);
77 int error;
78
79 if (ttyvp == NULL)
80 return (ENXIO);
81 vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY, p);
82#ifdef PARANOID
83 /*
84 * Since group is tty and mode is 620 on most terminal lines
85 * and since sessions protect terminals from processes outside
86 * your session, this check is probably no longer necessary.
87 * Since it inhibits setuid root programs that later switch
88 * to another user from accessing /dev/tty, we have decided
89 * to delete this test. (mckusick 5/93)
90 */
91 error = VOP_ACCESS(ttyvp,
92 (flag&FREAD ? VREAD : 0) | (flag&FWRITE ? VWRITE : 0), p->p_ucred, p);
93 if (!error)
94#endif /* PARANOID */
95 error = VOP_OPEN(ttyvp, flag, NOCRED, p);
96 VOP_UNLOCK(ttyvp, 0, p);
97 return (error);
98}
99
100/*ARGSUSED*/
101static int
102cttyread(dev, uio, flag)
103 dev_t dev;
104 struct uio *uio;
105 int flag;
106{
107 struct proc *p = uio->uio_procp;
108 register struct vnode *ttyvp = cttyvp(p);
109 int error;
110
111 if (ttyvp == NULL)
112 return (EIO);
113 vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY, p);
114 error = VOP_READ(ttyvp, uio, flag, NOCRED);
115 VOP_UNLOCK(ttyvp, 0, p);
116 return (error);
117}
118
119/*ARGSUSED*/
120static int
121cttywrite(dev, uio, flag)
122 dev_t dev;
123 struct uio *uio;
124 int flag;
125{
126 struct proc *p = uio->uio_procp;
127 struct vnode *ttyvp = cttyvp(uio->uio_procp);
128 int error;
129
130 if (ttyvp == NULL)
131 return (EIO);
132 vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY, p);
133 error = VOP_WRITE(ttyvp, uio, flag, NOCRED);
134 VOP_UNLOCK(ttyvp, 0, p);
135 return (error);
136}
137
138/*ARGSUSED*/
139static int
140cttyioctl(dev, cmd, addr, flag, p)
141 dev_t dev;
142 int cmd;
143 caddr_t addr;
144 int flag;
145 struct proc *p;
146{
147 struct vnode *ttyvp = cttyvp(p);
148
149 if (ttyvp == NULL)
150 return (EIO);
151 if (cmd == TIOCSCTTY) /* don't allow controlling tty to be set */
152 return EINVAL; /* to controlling tty -- infinite recursion */
153 if (cmd == TIOCNOTTY) {
154 if (!SESS_LEADER(p)) {
155 p->p_flag &= ~P_CONTROLT;
156 return (0);
157 } else
158 return (EINVAL);
159 }
160 return (VOP_IOCTL(ttyvp, cmd, addr, flag, NOCRED, p));
161}
162
163/*ARGSUSED*/
164static int
165cttyselect(dev, flag, p)
166 dev_t dev;
167 int flag;
168 struct proc *p;
169{
170 struct vnode *ttyvp = cttyvp(p);
171
172 if (ttyvp == NULL)
173 return (1); /* try operation to get EOF/failure */
174 return (VOP_SELECT(ttyvp, flag, FREAD|FWRITE, NOCRED, p));
175}
176
177static ctty_devsw_installed = 0;
178#ifdef DEVFS
179static void *ctty_devfs_token;
180#endif
181
182static void
183ctty_drvinit(void *unused)
184{
185 dev_t dev;
186
187 if( ! ctty_devsw_installed ) {
188 dev = makedev(CDEV_MAJOR,0);
189 cdevsw_add(&dev,&ctty_cdevsw,NULL);
190 ctty_devsw_installed = 1;
191#ifdef DEVFS
192 ctty_devfs_token =
193 devfs_add_devswf(&ctty_cdevsw, 0, DV_CHR, 0, 0,
194 0666, "tty");
195#endif
196 }
197}
198
199SYSINIT(cttydev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,ctty_drvinit,NULL)
| 48#include <sys/kernel.h>
49#ifdef DEVFS
50#include <sys/devfsext.h>
51#endif /*DEVFS*/
52
53static d_open_t cttyopen;
54static d_read_t cttyread;
55static d_write_t cttywrite;
56static d_ioctl_t cttyioctl;
57static d_select_t cttyselect;
58
59#define CDEV_MAJOR 1
60/* Don't make static, fdesc_vnops uses this. */
61struct cdevsw ctty_cdevsw =
62 { cttyopen, nullclose, cttyread, cttywrite, /*1*/
63 cttyioctl, nullstop, nullreset, nodevtotty,/* tty */
64 cttyselect, nommap, NULL, "ctty", NULL, -1 };
65
66
67#define cttyvp(p) ((p)->p_flag & P_CONTROLT ? (p)->p_session->s_ttyvp : NULL)
68
69/*ARGSUSED*/
70static int
71cttyopen(dev, flag, mode, p)
72 dev_t dev;
73 int flag, mode;
74 struct proc *p;
75{
76 struct vnode *ttyvp = cttyvp(p);
77 int error;
78
79 if (ttyvp == NULL)
80 return (ENXIO);
81 vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY, p);
82#ifdef PARANOID
83 /*
84 * Since group is tty and mode is 620 on most terminal lines
85 * and since sessions protect terminals from processes outside
86 * your session, this check is probably no longer necessary.
87 * Since it inhibits setuid root programs that later switch
88 * to another user from accessing /dev/tty, we have decided
89 * to delete this test. (mckusick 5/93)
90 */
91 error = VOP_ACCESS(ttyvp,
92 (flag&FREAD ? VREAD : 0) | (flag&FWRITE ? VWRITE : 0), p->p_ucred, p);
93 if (!error)
94#endif /* PARANOID */
95 error = VOP_OPEN(ttyvp, flag, NOCRED, p);
96 VOP_UNLOCK(ttyvp, 0, p);
97 return (error);
98}
99
100/*ARGSUSED*/
101static int
102cttyread(dev, uio, flag)
103 dev_t dev;
104 struct uio *uio;
105 int flag;
106{
107 struct proc *p = uio->uio_procp;
108 register struct vnode *ttyvp = cttyvp(p);
109 int error;
110
111 if (ttyvp == NULL)
112 return (EIO);
113 vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY, p);
114 error = VOP_READ(ttyvp, uio, flag, NOCRED);
115 VOP_UNLOCK(ttyvp, 0, p);
116 return (error);
117}
118
119/*ARGSUSED*/
120static int
121cttywrite(dev, uio, flag)
122 dev_t dev;
123 struct uio *uio;
124 int flag;
125{
126 struct proc *p = uio->uio_procp;
127 struct vnode *ttyvp = cttyvp(uio->uio_procp);
128 int error;
129
130 if (ttyvp == NULL)
131 return (EIO);
132 vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY, p);
133 error = VOP_WRITE(ttyvp, uio, flag, NOCRED);
134 VOP_UNLOCK(ttyvp, 0, p);
135 return (error);
136}
137
138/*ARGSUSED*/
139static int
140cttyioctl(dev, cmd, addr, flag, p)
141 dev_t dev;
142 int cmd;
143 caddr_t addr;
144 int flag;
145 struct proc *p;
146{
147 struct vnode *ttyvp = cttyvp(p);
148
149 if (ttyvp == NULL)
150 return (EIO);
151 if (cmd == TIOCSCTTY) /* don't allow controlling tty to be set */
152 return EINVAL; /* to controlling tty -- infinite recursion */
153 if (cmd == TIOCNOTTY) {
154 if (!SESS_LEADER(p)) {
155 p->p_flag &= ~P_CONTROLT;
156 return (0);
157 } else
158 return (EINVAL);
159 }
160 return (VOP_IOCTL(ttyvp, cmd, addr, flag, NOCRED, p));
161}
162
163/*ARGSUSED*/
164static int
165cttyselect(dev, flag, p)
166 dev_t dev;
167 int flag;
168 struct proc *p;
169{
170 struct vnode *ttyvp = cttyvp(p);
171
172 if (ttyvp == NULL)
173 return (1); /* try operation to get EOF/failure */
174 return (VOP_SELECT(ttyvp, flag, FREAD|FWRITE, NOCRED, p));
175}
176
177static ctty_devsw_installed = 0;
178#ifdef DEVFS
179static void *ctty_devfs_token;
180#endif
181
182static void
183ctty_drvinit(void *unused)
184{
185 dev_t dev;
186
187 if( ! ctty_devsw_installed ) {
188 dev = makedev(CDEV_MAJOR,0);
189 cdevsw_add(&dev,&ctty_cdevsw,NULL);
190 ctty_devsw_installed = 1;
191#ifdef DEVFS
192 ctty_devfs_token =
193 devfs_add_devswf(&ctty_cdevsw, 0, DV_CHR, 0, 0,
194 0666, "tty");
195#endif
196 }
197}
198
199SYSINIT(cttydev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,ctty_drvinit,NULL)
|