1 /* $NetBSD: tty_bsdpty.c,v 1.4 2005/05/29 22:24:15 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 2004 The NetBSD Foundation, Inc. 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 by the NetBSD 18 * Foundation, Inc. and its contributors. 19 * 4. Neither the name of The NetBSD Foundation nor the names of its 20 * contributors may be used to endorse or promote products derived 21 * from this software without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 24 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 25 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 26 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 27 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 33 * POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 __KERNEL_RCSID(0, "$NetBSD: tty_bsdpty.c,v 1.4 2005/05/29 22:24:15 christos Exp $"); 38 39 #include "opt_ptm.h" 40 41 #ifdef COMPAT_BSDPTY 42 /* bsd tty implementation for pty multiplexor driver /dev/ptm{,x} */ 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/ioctl.h> 47 #include <sys/proc.h> 48 #include <sys/tty.h> 49 #include <sys/stat.h> 50 #include <sys/file.h> 51 #include <sys/uio.h> 52 #include <sys/kernel.h> 53 #include <sys/vnode.h> 54 #include <sys/namei.h> 55 #include <sys/signalvar.h> 56 #include <sys/uio.h> 57 #include <sys/filedesc.h> 58 #include <sys/conf.h> 59 #include <sys/poll.h> 60 #include <sys/malloc.h> 61 #include <sys/pty.h> 62 63 /* 64 * pts == /dev/tty[pqrs]? 65 * ptc == /dev/pty[pqrs]? 66 */ 67 68 /* 69 * All this hard-coding is really evil. 70 */ 71 #define TTY_GID 4 72 #define TTY_PERM (S_IRUSR|S_IWUSR|S_IWGRP) 73 #define TTY_TEMPLATE "/dev/XtyXX" 74 #define TTY_NAMESIZE sizeof(TTY_TEMPLATE) 75 #define TTY_LETTERS "pqrstuvwxyzPQRST" 76 #define TTY_OLD_SUFFIX "0123456789abcdef" 77 #define TTY_NEW_SUFFIX "ghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ" 78 79 static int pty_makename(struct ptm_pty *, char *, size_t, dev_t, char); 80 static int pty_allocvp(struct ptm_pty *, struct proc *, struct vnode **, 81 dev_t, char); 82 static void pty_getvattr(struct ptm_pty *, struct proc *, struct vattr *); 83 84 struct ptm_pty ptm_bsdpty = { 85 pty_allocvp, 86 pty_makename, 87 pty_getvattr, 88 NULL 89 }; 90 91 static int 92 /*ARGSUSED*/ 93 pty_makename(struct ptm_pty *ptm, char *bf, size_t bufsiz, dev_t dev, char c) 94 { 95 size_t nt; 96 dev_t minor = minor(dev); 97 if (bufsiz < TTY_NAMESIZE) 98 return EINVAL; 99 (void)memcpy(bf, TTY_TEMPLATE, TTY_NAMESIZE); 100 101 bf[5] = c; 102 103 if (minor < 256) { 104 nt = sizeof(TTY_OLD_SUFFIX) - 1; 105 bf[8] = TTY_LETTERS[minor / nt]; 106 bf[9] = TTY_OLD_SUFFIX[minor % nt]; 107 } else { 108 minor -= 256; 109 nt = sizeof(TTY_NEW_SUFFIX) - sizeof(TTY_OLD_SUFFIX); 110 bf[8] = TTY_LETTERS[minor / nt]; 111 bf[9] = TTY_NEW_SUFFIX[minor % nt]; 112 } 113 return 0; 114 } 115 116 117 static int 118 /*ARGSUSED*/ 119 pty_allocvp(struct ptm_pty *ptm, struct proc *p, struct vnode **vp, dev_t dev, 120 char ms) 121 { 122 int error; 123 struct nameidata nd; 124 char name[TTY_NAMESIZE]; 125 126 error = (*ptm->makename)(ptm, name, sizeof(name), dev, ms); 127 if (error) 128 return error; 129 130 NDINIT(&nd, LOOKUP, NOFOLLOW|LOCKLEAF, UIO_SYSSPACE, name, p); 131 if ((error = namei(&nd)) != 0) 132 return error; 133 *vp = nd.ni_vp; 134 return 0; 135 } 136 137 138 static void 139 /*ARGSUSED*/ 140 pty_getvattr(struct ptm_pty *ptm, struct proc *p, struct vattr *vattr) 141 { 142 VATTR_NULL(vattr); 143 /* get real uid */ 144 vattr->va_uid = p->p_cred->p_ruid; 145 vattr->va_gid = TTY_GID; 146 vattr->va_mode = TTY_PERM; 147 } 148 #endif 149