qapi2texi: Fix up output around #optional
[qemu.git] / migration / socket.c
1 /*
2 * QEMU live migration via socket
3 *
4 * Copyright Red Hat, Inc. 2009-2016
5 *
6 * Authors:
7 * Chris Lalancette <clalance@redhat.com>
8 * Daniel P. Berrange <berrange@redhat.com>
9 *
10 * This work is licensed under the terms of the GNU GPL, version 2. See
11 * the COPYING file in the top-level directory.
12 *
13 * Contributions after 2012-01-13 are licensed under the terms of the
14 * GNU GPL, version 2 or (at your option) any later version.
15 */
16
17 #include "qemu/osdep.h"
18
19 #include "qemu-common.h"
20 #include "qemu/error-report.h"
21 #include "qapi/error.h"
22 #include "migration/migration.h"
23 #include "migration/qemu-file.h"
24 #include "io/channel-socket.h"
25 #include "trace.h"
26
27
28 static SocketAddress *tcp_build_address(const char *host_port, Error **errp)
29 {
30 InetSocketAddress *iaddr = inet_parse(host_port, errp);
31 SocketAddress *saddr;
32
33 if (!iaddr) {
34 return NULL;
35 }
36
37 saddr = g_new0(SocketAddress, 1);
38 saddr->type = SOCKET_ADDRESS_KIND_INET;
39 saddr->u.inet.data = iaddr;
40
41 return saddr;
42 }
43
44
45 static SocketAddress *unix_build_address(const char *path)
46 {
47 SocketAddress *saddr;
48
49 saddr = g_new0(SocketAddress, 1);
50 saddr->type = SOCKET_ADDRESS_KIND_UNIX;
51 saddr->u.q_unix.data = g_new0(UnixSocketAddress, 1);
52 saddr->u.q_unix.data->path = g_strdup(path);
53
54 return saddr;
55 }
56
57
58 struct SocketConnectData {
59 MigrationState *s;
60 char *hostname;
61 };
62
63 static void socket_connect_data_free(void *opaque)
64 {
65 struct SocketConnectData *data = opaque;
66 if (!data) {
67 return;
68 }
69 g_free(data->hostname);
70 g_free(data);
71 }
72
73 static void socket_outgoing_migration(QIOTask *task,
74 gpointer opaque)
75 {
76 struct SocketConnectData *data = opaque;
77 QIOChannel *sioc = QIO_CHANNEL(qio_task_get_source(task));
78 Error *err = NULL;
79
80 if (qio_task_propagate_error(task, &err)) {
81 trace_migration_socket_outgoing_error(error_get_pretty(err));
82 data->s->to_dst_file = NULL;
83 migrate_fd_error(data->s, err);
84 error_free(err);
85 } else {
86 trace_migration_socket_outgoing_connected(data->hostname);
87 migration_channel_connect(data->s, sioc, data->hostname);
88 }
89 object_unref(OBJECT(sioc));
90 }
91
92 static void socket_start_outgoing_migration(MigrationState *s,
93 SocketAddress *saddr,
94 Error **errp)
95 {
96 QIOChannelSocket *sioc = qio_channel_socket_new();
97 struct SocketConnectData *data = g_new0(struct SocketConnectData, 1);
98
99 data->s = s;
100 if (saddr->type == SOCKET_ADDRESS_KIND_INET) {
101 data->hostname = g_strdup(saddr->u.inet.data->host);
102 }
103
104 qio_channel_set_name(QIO_CHANNEL(sioc), "migration-socket-outgoing");
105 qio_channel_socket_connect_async(sioc,
106 saddr,
107 socket_outgoing_migration,
108 data,
109 socket_connect_data_free);
110 qapi_free_SocketAddress(saddr);
111 }
112
113 void tcp_start_outgoing_migration(MigrationState *s,
114 const char *host_port,
115 Error **errp)
116 {
117 Error *err = NULL;
118 SocketAddress *saddr = tcp_build_address(host_port, &err);
119 if (!err) {
120 socket_start_outgoing_migration(s, saddr, &err);
121 }
122 error_propagate(errp, err);
123 }
124
125 void unix_start_outgoing_migration(MigrationState *s,
126 const char *path,
127 Error **errp)
128 {
129 SocketAddress *saddr = unix_build_address(path);
130 socket_start_outgoing_migration(s, saddr, errp);
131 }
132
133
134 static gboolean socket_accept_incoming_migration(QIOChannel *ioc,
135 GIOCondition condition,
136 gpointer opaque)
137 {
138 QIOChannelSocket *sioc;
139 Error *err = NULL;
140
141 sioc = qio_channel_socket_accept(QIO_CHANNEL_SOCKET(ioc),
142 &err);
143 if (!sioc) {
144 error_report("could not accept migration connection (%s)",
145 error_get_pretty(err));
146 goto out;
147 }
148
149 trace_migration_socket_incoming_accepted();
150
151 qio_channel_set_name(QIO_CHANNEL(sioc), "migration-socket-incoming");
152 migration_channel_process_incoming(migrate_get_current(),
153 QIO_CHANNEL(sioc));
154 object_unref(OBJECT(sioc));
155
156 out:
157 /* Close listening socket as its no longer needed */
158 qio_channel_close(ioc, NULL);
159 return FALSE; /* unregister */
160 }
161
162
163 static void socket_start_incoming_migration(SocketAddress *saddr,
164 Error **errp)
165 {
166 QIOChannelSocket *listen_ioc = qio_channel_socket_new();
167
168 qio_channel_set_name(QIO_CHANNEL(listen_ioc),
169 "migration-socket-listener");
170
171 if (qio_channel_socket_listen_sync(listen_ioc, saddr, errp) < 0) {
172 object_unref(OBJECT(listen_ioc));
173 qapi_free_SocketAddress(saddr);
174 return;
175 }
176
177 qio_channel_add_watch(QIO_CHANNEL(listen_ioc),
178 G_IO_IN,
179 socket_accept_incoming_migration,
180 listen_ioc,
181 (GDestroyNotify)object_unref);
182 qapi_free_SocketAddress(saddr);
183 }
184
185 void tcp_start_incoming_migration(const char *host_port, Error **errp)
186 {
187 Error *err = NULL;
188 SocketAddress *saddr = tcp_build_address(host_port, &err);
189 if (!err) {
190 socket_start_incoming_migration(saddr, &err);
191 }
192 error_propagate(errp, err);
193 }
194
195 void unix_start_incoming_migration(const char *path, Error **errp)
196 {
197 SocketAddress *saddr = unix_build_address(path);
198 socket_start_incoming_migration(saddr, errp);
199 }