Home | History | Annotate | Line # | Download | only in kern
      1  1.20  christos /*	$NetBSD: tty_bsdpty.c,v 1.20 2014/04/04 18:11:58 christos Exp $	*/
      2   1.1  christos 
      3   1.1  christos /*-
      4   1.1  christos  * Copyright (c) 2004 The NetBSD Foundation, Inc.
      5   1.1  christos  * All rights reserved.
      6   1.1  christos  *
      7   1.1  christos  * Redistribution and use in source and binary forms, with or without
      8   1.1  christos  * modification, are permitted provided that the following conditions
      9   1.1  christos  * are met:
     10   1.1  christos  * 1. Redistributions of source code must retain the above copyright
     11   1.1  christos  *    notice, this list of conditions and the following disclaimer.
     12   1.1  christos  * 2. Redistributions in binary form must reproduce the above copyright
     13   1.1  christos  *    notice, this list of conditions and the following disclaimer in the
     14   1.1  christos  *    documentation and/or other materials provided with the distribution.
     15   1.1  christos  *
     16   1.1  christos  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     17   1.1  christos  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     18   1.1  christos  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     19   1.1  christos  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     20   1.1  christos  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     21   1.1  christos  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     22   1.1  christos  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     23   1.1  christos  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     24   1.1  christos  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     25   1.1  christos  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     26   1.1  christos  * POSSIBILITY OF SUCH DAMAGE.
     27   1.1  christos  */
     28   1.1  christos 
     29   1.1  christos #include <sys/cdefs.h>
     30  1.20  christos __KERNEL_RCSID(0, "$NetBSD: tty_bsdpty.c,v 1.20 2014/04/04 18:11:58 christos Exp $");
     31   1.1  christos 
     32   1.1  christos #include "opt_ptm.h"
     33   1.1  christos 
     34  1.19  christos #ifndef NO_DEV_PTM
     35   1.1  christos #ifdef COMPAT_BSDPTY
     36   1.1  christos /* bsd tty implementation for pty multiplexor driver /dev/ptm{,x} */
     37   1.1  christos 
     38   1.1  christos #include <sys/param.h>
     39   1.1  christos #include <sys/systm.h>
     40   1.1  christos #include <sys/ioctl.h>
     41   1.5  christos #include <sys/lwp.h>
     42   1.1  christos #include <sys/tty.h>
     43   1.1  christos #include <sys/stat.h>
     44   1.1  christos #include <sys/file.h>
     45   1.1  christos #include <sys/uio.h>
     46   1.1  christos #include <sys/kernel.h>
     47   1.1  christos #include <sys/vnode.h>
     48   1.1  christos #include <sys/namei.h>
     49   1.1  christos #include <sys/signalvar.h>
     50   1.1  christos #include <sys/filedesc.h>
     51   1.1  christos #include <sys/conf.h>
     52   1.1  christos #include <sys/poll.h>
     53   1.1  christos #include <sys/pty.h>
     54   1.8      elad #include <sys/kauth.h>
     55   1.1  christos 
     56   1.1  christos /*
     57   1.1  christos  * pts == /dev/tty[pqrs]?
     58   1.1  christos  * ptc == /dev/pty[pqrs]?
     59   1.1  christos  */
     60   1.1  christos 
     61   1.2  christos /*
     62   1.2  christos  * All this hard-coding is really evil.
     63   1.2  christos  */
     64   1.3     perry #define TTY_GID		4
     65   1.2  christos #define TTY_PERM	(S_IRUSR|S_IWUSR|S_IWGRP)
     66   1.1  christos #define TTY_TEMPLATE	"/dev/XtyXX"
     67   1.1  christos #define TTY_NAMESIZE	sizeof(TTY_TEMPLATE)
     68   1.1  christos #define TTY_LETTERS	"pqrstuvwxyzPQRST"
     69   1.1  christos #define TTY_OLD_SUFFIX  "0123456789abcdef"
     70   1.1  christos #define TTY_NEW_SUFFIX  "ghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
     71   1.1  christos 
     72  1.19  christos static int pty_makename(struct mount *, struct lwp *, char *, size_t, dev_t,
     73   1.7  christos     char);
     74  1.19  christos static int pty_allocvp(struct mount *, struct lwp *, struct vnode **,
     75   1.1  christos     dev_t, char);
     76  1.19  christos static void pty_getvattr(struct mount *, struct lwp *, struct vattr *);
     77  1.20  christos static int pty__getmp(struct lwp *, struct mount **);
     78   1.1  christos 
     79   1.1  christos struct ptm_pty ptm_bsdpty = {
     80   1.1  christos 	pty_allocvp,
     81   1.1  christos 	pty_makename,
     82   1.2  christos 	pty_getvattr,
     83  1.20  christos 	pty__getmp,
     84   1.1  christos };
     85   1.1  christos 
     86   1.1  christos static int
     87   1.1  christos /*ARGSUSED*/
     88  1.19  christos pty_makename(struct mount *mp, struct lwp *l, char *bf,
     89  1.10  christos     size_t bufsiz, dev_t dev, char c)
     90   1.1  christos {
     91   1.1  christos 	size_t nt;
     92   1.1  christos 	dev_t minor = minor(dev);
     93   1.6  christos 	const char *suffix;
     94   1.6  christos 
     95   1.1  christos 	if (bufsiz < TTY_NAMESIZE)
     96   1.1  christos 		return EINVAL;
     97   1.6  christos 
     98   1.4  christos 	(void)memcpy(bf, TTY_TEMPLATE, TTY_NAMESIZE);
     99   1.1  christos 
    100   1.1  christos 	if (minor < 256) {
    101   1.6  christos 		suffix = TTY_OLD_SUFFIX;
    102   1.1  christos 		nt = sizeof(TTY_OLD_SUFFIX) - 1;
    103   1.1  christos 	} else {
    104   1.1  christos 		minor -= 256;
    105   1.6  christos 		suffix = TTY_NEW_SUFFIX;
    106   1.6  christos 		nt = sizeof(TTY_NEW_SUFFIX) - 1;
    107   1.1  christos 	}
    108   1.6  christos 
    109   1.6  christos 	bf[5] = c;
    110   1.6  christos 	bf[8] = TTY_LETTERS[minor / nt];
    111   1.6  christos 	bf[9] = suffix[minor % nt];
    112   1.1  christos 	return 0;
    113   1.1  christos }
    114   1.1  christos 
    115   1.1  christos 
    116   1.1  christos static int
    117   1.1  christos /*ARGSUSED*/
    118  1.19  christos pty_allocvp(struct mount *mp, struct lwp *l, struct vnode **vp, dev_t dev,
    119   1.1  christos     char ms)
    120   1.1  christos {
    121   1.1  christos 	int error;
    122  1.17  dholland 	struct pathbuf *pb;
    123   1.1  christos 	struct nameidata nd;
    124   1.1  christos 	char name[TTY_NAMESIZE];
    125   1.1  christos 
    126  1.19  christos 	error = pty_makename(NULL, l, name, sizeof(name), dev, ms);
    127   1.1  christos 	if (error)
    128   1.1  christos 		return error;
    129   1.1  christos 
    130  1.17  dholland 	pb = pathbuf_create(name);
    131  1.17  dholland 	if (pb == NULL) {
    132  1.17  dholland 		return ENOMEM;
    133  1.17  dholland 	}
    134  1.17  dholland 
    135  1.17  dholland 	NDINIT(&nd, LOOKUP, NOFOLLOW|LOCKLEAF, pb);
    136  1.17  dholland 	if ((error = namei(&nd)) != 0) {
    137  1.17  dholland 		pathbuf_destroy(pb);
    138   1.1  christos 		return error;
    139  1.17  dholland 	}
    140   1.1  christos 	*vp = nd.ni_vp;
    141  1.17  dholland 	pathbuf_destroy(pb);
    142   1.1  christos 	return 0;
    143   1.1  christos }
    144   1.2  christos 
    145   1.2  christos 
    146   1.2  christos static void
    147   1.2  christos /*ARGSUSED*/
    148  1.19  christos pty_getvattr(struct mount *mp, struct lwp *l, struct vattr *vattr)
    149   1.2  christos {
    150  1.16     pooka 	vattr_null(vattr);
    151   1.2  christos 	/* get real uid */
    152   1.9        ad 	vattr->va_uid = kauth_cred_getuid(l->l_cred);
    153   1.2  christos 	vattr->va_gid = TTY_GID;
    154   1.2  christos 	vattr->va_mode = TTY_PERM;
    155   1.2  christos }
    156  1.20  christos 
    157  1.20  christos static int
    158  1.20  christos pty__getmp(struct lwp *l __unused, struct mount **mpp)
    159  1.20  christos {
    160  1.20  christos 	*mpp = 0;
    161  1.20  christos 	return 0;
    162  1.20  christos }
    163  1.20  christos 
    164  1.19  christos #endif /* COMPAT_BSDPTY */
    165  1.19  christos #endif /* NO_DEV_PTM */
    166