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/* $OpenBSD: tty_tty.c,v 1.33 2024/09/30 12:32:26 claudio Exp $ */
/* $NetBSD: tty_tty.c,v 1.13 1996/03/30 22:24:46 christos Exp $ */
/*-
* Copyright (c) 1982, 1986, 1991, 1993
* The 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. 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.
*
* @(#)tty_tty.c 8.2 (Berkeley) 9/23/93
*/
/*
* Indirect driver for controlling tty.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/tty.h>
#include <sys/vnode.h>
#include <sys/lock.h>
#include <sys/fcntl.h>
#define cttyvp(p) \
((p)->p_p->ps_flags & PS_CONTROLT ? \
(p)->p_p->ps_session->s_ttyvp : NULL)
int
cttyopen(dev_t dev, int flag, int mode, struct proc *p)
{
struct vnode *ttyvp = cttyvp(p);
int error;
if (ttyvp == NULL)
return (ENXIO);
vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY);
error = VOP_OPEN(ttyvp, flag, NOCRED, p);
VOP_UNLOCK(ttyvp);
return (error);
}
int
cttyread(dev_t dev, struct uio *uio, int flag)
{
struct vnode *ttyvp = cttyvp(uio->uio_procp);
int error;
if (ttyvp == NULL)
return (EIO);
vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY);
error = VOP_READ(ttyvp, uio, flag, NOCRED);
VOP_UNLOCK(ttyvp);
return (error);
}
int
cttywrite(dev_t dev, struct uio *uio, int flag)
{
struct vnode *ttyvp = cttyvp(uio->uio_procp);
int error;
if (ttyvp == NULL)
return (EIO);
vn_lock(ttyvp, LK_EXCLUSIVE | LK_RETRY);
error = VOP_WRITE(ttyvp, uio, flag, NOCRED);
VOP_UNLOCK(ttyvp);
return (error);
}
int
cttyioctl(dev_t dev, u_long cmd, caddr_t addr, int flag, struct proc *p)
{
struct vnode *ttyvp = cttyvp(p);
struct session *sess;
int error, secs;
if (ttyvp == NULL)
return (EIO);
if (cmd == TIOCSCTTY) /* XXX */
return (EINVAL);
if (cmd == TIOCNOTTY) {
if (!SESS_LEADER(p->p_p)) {
atomic_clearbits_int(&p->p_p->ps_flags, PS_CONTROLT);
return (0);
} else
return (EINVAL);
}
switch (cmd) {
case TIOCSETVERAUTH:
if ((error = suser(p)))
return error;
secs = *(int *)addr;
if (secs < 1 || secs > 3600)
return EINVAL;
sess = p->p_p->ps_pgrp->pg_session;
sess->s_verauthuid = p->p_ucred->cr_ruid;
sess->s_verauthppid = p->p_p->ps_ppid;
timeout_add_sec(&sess->s_verauthto, secs);
return 0;
case TIOCCLRVERAUTH:
sess = p->p_p->ps_pgrp->pg_session;
timeout_del(&sess->s_verauthto);
zapverauth(sess);
return 0;
case TIOCCHKVERAUTH:
/*
* It's not clear when or what these checks are for.
* How can we reach this code with a different ruid?
* The ppid check is also more porous than desired.
* Nevertheless, the checks reflect the original intention;
* namely, that it be the same user using the same shell.
*/
sess = p->p_p->ps_pgrp->pg_session;
if (sess->s_verauthuid == p->p_ucred->cr_ruid &&
sess->s_verauthppid == p->p_p->ps_ppid)
return 0;
return EPERM;
}
return (VOP_IOCTL(ttyvp, cmd, addr, flag, NOCRED, p));
}
int
cttykqfilter(dev_t dev, struct knote *kn)
{
struct vnode *ttyvp = cttyvp(curproc);
if (ttyvp == NULL) {
if (kn->kn_flags & (__EV_POLL | __EV_SELECT))
return (seltrue_kqfilter(dev, kn));
return (ENXIO);
}
return (VOP_KQFILTER(ttyvp, FREAD|FWRITE, kn));
}
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