Differential D26976 Diff 82061 usr.sbin/bhyve/dbgport.c

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usr.sbin/bhyve/dbgport.c

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				/*-
				* 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/socket.h>
				#include <netinet/in.h>
				#include <netinet/tcp.h>
				#include <sys/uio.h>

				#ifndef WITHOUT_CAPSICUM
				#include <capsicum_helpers.h>
				#endif
				#include <err.h>
				#include <stdio.h>
				#include <stdlib.h>
				#include <sysexits.h>
				#include <fcntl.h>
				#include <unistd.h>
				#include <errno.h>

				#include "inout.h"
				#include "dbgport.h"
				#include "pci_lpc.h"

				#define BVM_DBG_PORT 0x224
				#define BVM_DBG_SIG ('B' << 8 \| 'V')

				static int listen_fd, conn_fd;

				static struct sockaddr_in sin;

				static int
				dbg_handler(struct vmctx *ctx, int vcpu, int in, int port, int bytes,
				uint32_t eax, void arg)
				{
				int nwritten, nread, printonce;
				int on = 1;
				char ch;

				if (bytes == 2 && in) {
				*eax = BVM_DBG_SIG;
				return (0);
				}

				if (bytes != 4)
				return (-1);

				again:
				printonce = 0;
				while (conn_fd < 0) {
				if (!printonce) {
				printf("Waiting for connection from gdb\r\n");
				printonce = 1;
				}
				conn_fd = accept4(listen_fd, NULL, NULL, SOCK_NONBLOCK);
				if (conn_fd >= 0) {
				/* Avoid EPIPE after the client drops off. */
				(void)setsockopt(conn_fd, SOL_SOCKET, SO_NOSIGPIPE,
				&on, sizeof(on));
				/* Improve latency for one byte at a time tranfers. */
				(void)setsockopt(conn_fd, IPPROTO_TCP, TCP_NODELAY,
				&on, sizeof(on));
				} else if (errno != EINTR) {
				perror("accept");
				}
				}

				if (in) {
				nread = read(conn_fd, &ch, 1);
				if (nread == -1 && errno == EAGAIN)
				*eax = -1;
				else if (nread == 1)
				*eax = ch;
				else {
				close(conn_fd);
				conn_fd = -1;
				goto again;
				}
				} else {
				ch = *eax;
				nwritten = write(conn_fd, &ch, 1);
				if (nwritten != 1) {
				close(conn_fd);
				conn_fd = -1;
				goto again;
				}
				}
				return (0);
				}

				static struct inout_port dbgport = {
				"bvmdbg",
				BVM_DBG_PORT,
				1,
				IOPORT_F_INOUT,
				dbg_handler
				};

				SYSRES_IO(BVM_DBG_PORT, 4);

				void
				init_dbgport(int sport)
				{
				int reuse;
				#ifndef WITHOUT_CAPSICUM
				cap_rights_t rights;
				#endif

				conn_fd = -1;

				if ((listen_fd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
				perror("cannot create socket");
				exit(4);
				}

				sin.sin_len = sizeof(sin);
				sin.sin_family = AF_INET;
				sin.sin_addr.s_addr = htonl(INADDR_ANY);
				sin.sin_port = htons(sport);

				reuse = 1;
				if (setsockopt(listen_fd, SOL_SOCKET, SO_REUSEADDR, &reuse,
				sizeof(reuse)) < 0) {
				perror("cannot set socket options");
				exit(4);
				}

				if (bind(listen_fd, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
				perror("cannot bind socket");
				exit(4);
				}

				if (listen(listen_fd, 1) < 0) {
				perror("cannot listen socket");
				exit(4);
				}

				#ifndef WITHOUT_CAPSICUM
				cap_rights_init(&rights, CAP_ACCEPT, CAP_READ, CAP_WRITE);
				if (caph_rights_limit(listen_fd, &rights) == -1)
				errx(EX_OSERR, "Unable to apply rights for sandbox");
				#endif

				register_inout(&dbgport);
				}