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/*
* QEMU live migration via Unix Domain Sockets
*
* Copyright Red Hat, Inc. 2009-2016
*
* Authors:
* Chris Lalancette <clalance@redhat.com>
* Daniel P. Berrange <berrange@redhat.com>
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*
* Contributions after 2012-01-13 are licensed under the terms of the
* GNU GPL, version 2 or (at your option) any later version.
*/
#include "qemu/osdep.h"
#include "qemu-common.h"
#include "qemu/error-report.h"
#include "qapi/error.h"
#include "migration/migration.h"
#include "migration/qemu-file.h"
#include "io/channel-socket.h"
#include "trace.h"
static SocketAddress *unix_build_address(const char *path)
{
SocketAddress *saddr;
saddr = g_new0(SocketAddress, 1);
saddr->type = SOCKET_ADDRESS_KIND_UNIX;
saddr->u.q_unix.data = g_new0(UnixSocketAddress, 1);
saddr->u.q_unix.data->path = g_strdup(path);
return saddr;
}
static void unix_outgoing_migration(Object *src,
Error *err,
gpointer opaque)
{
MigrationState *s = opaque;
QIOChannel *sioc = QIO_CHANNEL(src);
if (err) {
trace_migration_unix_outgoing_error(error_get_pretty(err));
s->to_dst_file = NULL;
migrate_fd_error(s, err);
} else {
trace_migration_unix_outgoing_connected();
migration_set_outgoing_channel(s, sioc);
}
object_unref(src);
}
void unix_start_outgoing_migration(MigrationState *s, const char *path, Error **errp)
{
SocketAddress *saddr = unix_build_address(path);
QIOChannelSocket *sioc;
sioc = qio_channel_socket_new();
qio_channel_socket_connect_async(sioc,
saddr,
unix_outgoing_migration,
s,
NULL);
qapi_free_SocketAddress(saddr);
}
static gboolean unix_accept_incoming_migration(QIOChannel *ioc,
GIOCondition condition,
gpointer opaque)
{
QIOChannelSocket *sioc;
Error *err = NULL;
sioc = qio_channel_socket_accept(QIO_CHANNEL_SOCKET(ioc),
&err);
if (!sioc) {
error_report("could not accept migration connection (%s)",
error_get_pretty(err));
goto out;
}
trace_migration_unix_incoming_accepted();
migration_set_incoming_channel(migrate_get_current(),
QIO_CHANNEL(sioc));
object_unref(OBJECT(sioc));
out:
/* Close listening socket as its no longer needed */
qio_channel_close(ioc, NULL);
return FALSE; /* unregister */
}
void unix_start_incoming_migration(const char *path, Error **errp)
{
SocketAddress *saddr = unix_build_address(path);
QIOChannelSocket *listen_ioc;
listen_ioc = qio_channel_socket_new();
if (qio_channel_socket_listen_sync(listen_ioc, saddr, errp) < 0) {
object_unref(OBJECT(listen_ioc));
qapi_free_SocketAddress(saddr);
return;
}
qio_channel_add_watch(QIO_CHANNEL(listen_ioc),
G_IO_IN,
unix_accept_incoming_migration,
listen_ioc,
(GDestroyNotify)object_unref);
qapi_free_SocketAddress(saddr);
}
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