166 lines
4.2 KiB
C
166 lines
4.2 KiB
C
/* $NetBSD: tty_bsdpty.c,v 1.20 2014/04/04 18:11:58 christos Exp $ */
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/*-
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* Copyright (c) 2004 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: tty_bsdpty.c,v 1.20 2014/04/04 18:11:58 christos Exp $");
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#include "opt_ptm.h"
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#ifndef NO_DEV_PTM
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#ifdef COMPAT_BSDPTY
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/* bsd tty implementation for pty multiplexor driver /dev/ptm{,x} */
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/ioctl.h>
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#include <sys/lwp.h>
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#include <sys/tty.h>
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#include <sys/stat.h>
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#include <sys/file.h>
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#include <sys/uio.h>
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#include <sys/kernel.h>
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#include <sys/vnode.h>
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#include <sys/namei.h>
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#include <sys/signalvar.h>
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#include <sys/filedesc.h>
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#include <sys/conf.h>
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#include <sys/poll.h>
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#include <sys/pty.h>
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#include <sys/kauth.h>
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/*
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* pts == /dev/tty[pqrs]?
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* ptc == /dev/pty[pqrs]?
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*/
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/*
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* All this hard-coding is really evil.
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*/
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#define TTY_GID 4
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#define TTY_PERM (S_IRUSR|S_IWUSR|S_IWGRP)
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#define TTY_TEMPLATE "/dev/XtyXX"
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#define TTY_NAMESIZE sizeof(TTY_TEMPLATE)
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#define TTY_LETTERS "pqrstuvwxyzPQRST"
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#define TTY_OLD_SUFFIX "0123456789abcdef"
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#define TTY_NEW_SUFFIX "ghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
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static int pty_makename(struct mount *, struct lwp *, char *, size_t, dev_t,
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char);
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static int pty_allocvp(struct mount *, struct lwp *, struct vnode **,
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dev_t, char);
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static void pty_getvattr(struct mount *, struct lwp *, struct vattr *);
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static int pty__getmp(struct lwp *, struct mount **);
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struct ptm_pty ptm_bsdpty = {
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pty_allocvp,
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pty_makename,
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pty_getvattr,
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pty__getmp,
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};
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static int
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/*ARGSUSED*/
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pty_makename(struct mount *mp, struct lwp *l, char *bf,
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size_t bufsiz, dev_t dev, char c)
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{
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size_t nt;
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dev_t minor = minor(dev);
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const char *suffix;
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if (bufsiz < TTY_NAMESIZE)
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return EINVAL;
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(void)memcpy(bf, TTY_TEMPLATE, TTY_NAMESIZE);
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if (minor < 256) {
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suffix = TTY_OLD_SUFFIX;
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nt = sizeof(TTY_OLD_SUFFIX) - 1;
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} else {
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minor -= 256;
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suffix = TTY_NEW_SUFFIX;
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nt = sizeof(TTY_NEW_SUFFIX) - 1;
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}
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bf[5] = c;
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bf[8] = TTY_LETTERS[minor / nt];
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bf[9] = suffix[minor % nt];
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return 0;
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}
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static int
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/*ARGSUSED*/
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pty_allocvp(struct mount *mp, struct lwp *l, struct vnode **vp, dev_t dev,
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char ms)
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{
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int error;
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struct pathbuf *pb;
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struct nameidata nd;
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char name[TTY_NAMESIZE];
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error = pty_makename(NULL, l, name, sizeof(name), dev, ms);
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if (error)
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return error;
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pb = pathbuf_create(name);
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if (pb == NULL) {
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return ENOMEM;
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}
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NDINIT(&nd, LOOKUP, NOFOLLOW|LOCKLEAF, pb);
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if ((error = namei(&nd)) != 0) {
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pathbuf_destroy(pb);
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return error;
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}
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*vp = nd.ni_vp;
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pathbuf_destroy(pb);
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return 0;
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}
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static void
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/*ARGSUSED*/
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pty_getvattr(struct mount *mp, struct lwp *l, struct vattr *vattr)
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{
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vattr_null(vattr);
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/* get real uid */
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vattr->va_uid = kauth_cred_getuid(l->l_cred);
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vattr->va_gid = TTY_GID;
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vattr->va_mode = TTY_PERM;
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}
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static int
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pty__getmp(struct lwp *l __unused, struct mount **mpp)
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{
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*mpp = 0;
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return 0;
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}
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#endif /* COMPAT_BSDPTY */
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#endif /* NO_DEV_PTM */
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