migration/socket.c

   1 /*
   2  * QEMU live migration via Unix Domain Sockets
   3  *
   4  * Copyright Red Hat, Inc. 2009-2016
   5  *
   6  * Authors:
   7  *  Chris Lalancette <[email protected]>
   8  *  Daniel P. Berrange <[email protected]>
   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(Object *src,
  74                                       Error *err,
  75                                       gpointer opaque)
  76 {
  77     struct SocketConnectData *data = opaque;
  78     QIOChannel *sioc = QIO_CHANNEL(src);
  79
  80     if (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     } else {
  85         trace_migration_socket_outgoing_connected(data->hostname);
  86         migration_channel_connect(data->s, sioc, data->hostname);
  87     }
  88     object_unref(src);
  89 }
  90
  91 static void socket_start_outgoing_migration(MigrationState *s,
  92                                             SocketAddress *saddr,
  93                                             Error **errp)
  94 {
  95     QIOChannelSocket *sioc = qio_channel_socket_new();
  96     struct SocketConnectData *data = g_new0(struct SocketConnectData, 1);
  97     data->s = s;
  98     if (saddr->type == SOCKET_ADDRESS_KIND_INET) {
  99         data->hostname = g_strdup(saddr->u.inet.data->host);
 100     }
 101     qio_channel_socket_connect_async(sioc,
 102                                      saddr,
 103                                      socket_outgoing_migration,
 104                                      data,
 105                                      socket_connect_data_free);
 106     qapi_free_SocketAddress(saddr);
 107 }
 108
 109 void tcp_start_outgoing_migration(MigrationState *s,
 110                                   const char *host_port,
 111                                   Error **errp)
 112 {
 113     SocketAddress *saddr = tcp_build_address(host_port, errp);
 114     socket_start_outgoing_migration(s, saddr, errp);
 115 }
 116
 117 void unix_start_outgoing_migration(MigrationState *s,
 118                                    const char *path,
 119                                    Error **errp)
 120 {
 121     SocketAddress *saddr = unix_build_address(path);
 122     socket_start_outgoing_migration(s, saddr, errp);
 123 }
 124
 125
 126 static gboolean socket_accept_incoming_migration(QIOChannel *ioc,
 127                                                  GIOCondition condition,
 128                                                  gpointer opaque)
 129 {
 130     QIOChannelSocket *sioc;
 131     Error *err = NULL;
 132
 133     sioc = qio_channel_socket_accept(QIO_CHANNEL_SOCKET(ioc),
 134                                      &err);
 135     if (!sioc) {
 136         error_report("could not accept migration connection (%s)",
 137                      error_get_pretty(err));
 138         goto out;
 139     }
 140
 141     trace_migration_socket_incoming_accepted();
 142
 143     migration_channel_process_incoming(migrate_get_current(),
 144                                        QIO_CHANNEL(sioc));
 145     object_unref(OBJECT(sioc));
 146
 147 out:
 148     /* Close listening socket as its no longer needed */
 149     qio_channel_close(ioc, NULL);
 150     return FALSE; /* unregister */
 151 }
 152
 153
 154 static void socket_start_incoming_migration(SocketAddress *saddr,
 155                                             Error **errp)
 156 {
 157     QIOChannelSocket *listen_ioc = qio_channel_socket_new();
 158
 159     if (qio_channel_socket_listen_sync(listen_ioc, saddr, errp) < 0) {
 160         object_unref(OBJECT(listen_ioc));
 161         qapi_free_SocketAddress(saddr);
 162         return;
 163     }
 164
 165     qio_channel_add_watch(QIO_CHANNEL(listen_ioc),
 166                           G_IO_IN,
 167                           socket_accept_incoming_migration,
 168                           listen_ioc,
 169                           (GDestroyNotify)object_unref);
 170     qapi_free_SocketAddress(saddr);
 171 }
 172
 173 void tcp_start_incoming_migration(const char *host_port, Error **errp)
 174 {
 175     SocketAddress *saddr = tcp_build_address(host_port, errp);
 176     socket_start_incoming_migration(saddr, errp);
 177 }
 178
 179 void unix_start_incoming_migration(const char *path, Error **errp)
 180 {
 181     SocketAddress *saddr = unix_build_address(path);
 182     socket_start_incoming_migration(saddr, errp);
 183 }