freebsd-skq/usr.sbin/bhyve/consport.c
Marcelo Araujo abfa3c39e7 Use capsicum_helpers(3) that allow us to simplify the code and its functions
will return success when the kernel is built without support of
the capability mode.

It is important to note, that I'm taking a more conservative approach
with these changes and it will be done in small steps.

Reviewed by:	jhb
MFC after:	6 weeks
Differential Revision:	https://reviews.freebsd.org/D18744
2019-01-16 00:39:23 +00:00

177 lines
3.8 KiB
C

/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2011 NetApp, Inc.
* 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.
*
* THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``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 NETAPP, INC 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.
*
* $FreeBSD$
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#ifndef WITHOUT_CAPSICUM
#include <sys/capsicum.h>
#endif
#include <sys/select.h>
#ifndef WITHOUT_CAPSICUM
#include <capsicum_helpers.h>
#endif
#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <termios.h>
#include <unistd.h>
#include <stdbool.h>
#include <sysexits.h>
#include "inout.h"
#include "pci_lpc.h"
#define BVM_CONSOLE_PORT 0x220
#define BVM_CONS_SIG ('b' << 8 | 'v')
static struct termios tio_orig, tio_new;
static void
ttyclose(void)
{
tcsetattr(STDIN_FILENO, TCSANOW, &tio_orig);
}
static void
ttyopen(void)
{
tcgetattr(STDIN_FILENO, &tio_orig);
cfmakeraw(&tio_new);
tcsetattr(STDIN_FILENO, TCSANOW, &tio_new);
atexit(ttyclose);
}
static bool
tty_char_available(void)
{
fd_set rfds;
struct timeval tv;
FD_ZERO(&rfds);
FD_SET(STDIN_FILENO, &rfds);
tv.tv_sec = 0;
tv.tv_usec = 0;
if (select(STDIN_FILENO + 1, &rfds, NULL, NULL, &tv) > 0) {
return (true);
} else {
return (false);
}
}
static int
ttyread(void)
{
char rb;
if (tty_char_available()) {
read(STDIN_FILENO, &rb, 1);
return (rb & 0xff);
} else {
return (-1);
}
}
static void
ttywrite(unsigned char wb)
{
(void) write(STDOUT_FILENO, &wb, 1);
}
static int
console_handler(struct vmctx *ctx, int vcpu, int in, int port, int bytes,
uint32_t *eax, void *arg)
{
static int opened;
#ifndef WITHOUT_CAPSICUM
cap_rights_t rights;
cap_ioctl_t cmds[] = { TIOCGETA, TIOCSETA, TIOCGWINSZ };
#endif
if (bytes == 2 && in) {
*eax = BVM_CONS_SIG;
return (0);
}
/*
* Guests might probe this port to look for old ISA devices
* using single-byte reads. Return 0xff for those.
*/
if (bytes == 1 && in) {
*eax = 0xff;
return (0);
}
if (bytes != 4)
return (-1);
if (!opened) {
#ifndef WITHOUT_CAPSICUM
cap_rights_init(&rights, CAP_EVENT, CAP_IOCTL, CAP_READ,
CAP_WRITE);
if (caph_rights_limit(STDIN_FILENO, &rights) == -1)
errx(EX_OSERR, "Unable to apply rights for sandbox");
if (caph_ioctls_limit(STDIN_FILENO, cmds, nitems(cmds)) == -1)
errx(EX_OSERR, "Unable to apply rights for sandbox");
#endif
ttyopen();
opened = 1;
}
if (in)
*eax = ttyread();
else
ttywrite(*eax);
return (0);
}
SYSRES_IO(BVM_CONSOLE_PORT, 4);
static struct inout_port consport = {
"bvmcons",
BVM_CONSOLE_PORT,
1,
IOPORT_F_INOUT,
console_handler
};
void
init_bvmcons(void)
{
register_inout(&consport);
}