1/*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2011 NetApp, 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 * 16 * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD$ 29 */ 30 31#include <sys/cdefs.h> 32__FBSDID("$FreeBSD$"); 33 34#include <sys/types.h> 35#ifndef WITHOUT_CAPSICUM 36#include <sys/capsicum.h> 37#endif 38#include <sys/select.h> 39 40#ifndef WITHOUT_CAPSICUM 41#include <capsicum_helpers.h> 42#endif 43#include <err.h> 44#include <errno.h> 45#include <stdio.h> 46#include <stdlib.h> 47#include <termios.h> 48#include <unistd.h> 49#include <stdbool.h> 50#include <sysexits.h> 51 52#include "inout.h" 53#include "pci_lpc.h" 54#include "debug.h" 55 56#define BVM_CONSOLE_PORT 0x220 57#define BVM_CONS_SIG ('b' << 8 | 'v') 58 59static struct termios tio_orig, tio_new; 60 61static void 62ttyclose(void) 63{ 64 tcsetattr(STDIN_FILENO, TCSANOW, &tio_orig); 65} 66 67static void 68ttyopen(void) 69{ 70 tcgetattr(STDIN_FILENO, &tio_orig); 71 72 cfmakeraw(&tio_new); 73 tcsetattr(STDIN_FILENO, TCSANOW, &tio_new); 74 raw_stdio = 1; 75 76 atexit(ttyclose); 77} 78 79static bool 80tty_char_available(void) 81{ 82 fd_set rfds; 83 struct timeval tv; 84 85 FD_ZERO(&rfds); 86 FD_SET(STDIN_FILENO, &rfds); 87 tv.tv_sec = 0; 88 tv.tv_usec = 0; 89 if (select(STDIN_FILENO + 1, &rfds, NULL, NULL, &tv) > 0) { 90 return (true); 91 } else { 92 return (false); 93 } 94} 95 96static int 97ttyread(void) 98{ 99 char rb; 100 101 if (tty_char_available()) { 102 read(STDIN_FILENO, &rb, 1); 103 return (rb & 0xff); 104 } else { 105 return (-1); 106 } 107} 108 109static void 110ttywrite(unsigned char wb) 111{ 112 (void) write(STDOUT_FILENO, &wb, 1); 113} 114 115static int 116console_handler(struct vmctx *ctx, int vcpu, int in, int port, int bytes, 117 uint32_t *eax, void *arg) 118{ 119 static int opened; 120#ifndef WITHOUT_CAPSICUM 121 cap_rights_t rights; 122 cap_ioctl_t cmds[] = { TIOCGETA, TIOCSETA, TIOCGWINSZ }; 123#endif 124 125 if (bytes == 2 && in) { 126 *eax = BVM_CONS_SIG; 127 return (0); 128 } 129 130 /* 131 * Guests might probe this port to look for old ISA devices 132 * using single-byte reads. Return 0xff for those. 133 */ 134 if (bytes == 1 && in) { 135 *eax = 0xff; 136 return (0); 137 } 138 139 if (bytes != 4) 140 return (-1); 141 142 if (!opened) { 143#ifndef WITHOUT_CAPSICUM 144 cap_rights_init(&rights, CAP_EVENT, CAP_IOCTL, CAP_READ, 145 CAP_WRITE); 146 if (caph_rights_limit(STDIN_FILENO, &rights) == -1) 147 errx(EX_OSERR, "Unable to apply rights for sandbox"); 148 if (caph_ioctls_limit(STDIN_FILENO, cmds, nitems(cmds)) == -1) 149 errx(EX_OSERR, "Unable to apply rights for sandbox"); 150#endif 151 ttyopen(); 152 opened = 1; 153 } 154 155 if (in) 156 *eax = ttyread(); 157 else 158 ttywrite(*eax); 159 160 return (0); 161} 162 163SYSRES_IO(BVM_CONSOLE_PORT, 4); 164 165static struct inout_port consport = { 166 "bvmcons", 167 BVM_CONSOLE_PORT, 168 1, 169 IOPORT_F_INOUT, 170 console_handler 171}; 172 173void 174init_bvmcons(void) 175{ 176 177 register_inout(&consport); 178} 179