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/* libguestfs
* Copyright (C) 2009-2020 Red Hat Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/un.h> /* sockaddr_un */
#include <string.h>
#include <libintl.h>
#include "guestfs.h"
#include "guestfs-internal.h"
#include "guestfs_protocol.h"
/* Alternate backend: instead of launching the appliance,
* connect to an existing unix socket.
*/
static int
launch_unix (guestfs_h *g, void *datav, const char *sockpath)
{
int r, daemon_sock = -1;
struct sockaddr_un addr;
uint32_t size;
void *buf = NULL;
if (g->hv_params) {
error (g, _("cannot set hv parameters with the 'unix:' backend"));
return -1;
}
if (strlen (sockpath) > UNIX_PATH_MAX-1) {
error (g, _("socket filename too long (more than %d characters): %s"),
UNIX_PATH_MAX-1, sockpath);
return -1;
}
debug (g, "connecting to %s", sockpath);
daemon_sock = socket (AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC, 0);
if (daemon_sock == -1) {
perrorf (g, "socket");
return -1;
}
addr.sun_family = AF_UNIX;
strncpy (addr.sun_path, sockpath, UNIX_PATH_MAX);
addr.sun_path[UNIX_PATH_MAX-1] = '\0';
g->state = LAUNCHING;
if (connect (daemon_sock, (struct sockaddr *) &addr, sizeof addr) == -1) {
perrorf (g, "bind");
goto cleanup;
}
g->conn = guestfs_int_new_conn_socket_connected (g, daemon_sock, -1);
if (!g->conn)
goto cleanup;
/* g->conn now owns this socket. */
daemon_sock = -1;
r = guestfs_int_recv_from_daemon (g, &size, &buf);
free (buf);
if (r == -1) goto cleanup;
if (size != GUESTFS_LAUNCH_FLAG) {
error (g, _("guestfs_launch failed, unexpected initial message from guestfsd"));
goto cleanup;
}
debug (g, "connected");
if (g->state != READY) {
error (g, _("contacted guestfsd, but state != READY"));
goto cleanup;
}
return 0;
cleanup:
if (daemon_sock >= 0)
close (daemon_sock);
if (g->conn) {
g->conn->ops->free_connection (g, g->conn);
g->conn = NULL;
}
return -1;
}
static int
shutdown_unix (guestfs_h *g, void *datav, int check_for_errors)
{
/* Merely closing g->daemon_sock is sufficient and that is already done
* in the calling code.
*/
return 0;
}
static struct backend_ops backend_unix_ops = {
.data_size = 0,
.launch = launch_unix,
.shutdown = shutdown_unix,
};
void
guestfs_int_init_unix_backend (void)
{
guestfs_int_register_backend ("unix", &backend_unix_ops);
}
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