/*-
* 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);
}
