migration/tls: add support for multifd tls-handshake

Similar like migration main thread, we need to do handshake
for each multifd thread.

Signed-off-by: Chuan Zheng <zhengchuan@huawei.com>
Signed-off-by: Yan Jin <jinyan12@huawei.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <1600139042-104593-6-git-send-email-zhengchuan@huawei.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

migration/multifd.c

@@ -20,6 +20,7 @@
 #include "ram.h"
 #include "migration.h"
 #include "socket.h"
+#include "tls.h"
 #include "qemu-file.h"
 #include "trace.h"
 #include "multifd.h"
@@ -719,6 +720,77 @@ out:
     return NULL;
 }
 
+static bool multifd_channel_connect(MultiFDSendParams *p,
+                                    QIOChannel *ioc,
+                                    Error *error);
+
+static void multifd_tls_outgoing_handshake(QIOTask *task,
+                                           gpointer opaque)
+{
+    MultiFDSendParams *p = opaque;
+    QIOChannel *ioc = QIO_CHANNEL(qio_task_get_source(task));
+    Error *err = NULL;
+
+    qio_task_propagate_error(task, &err);
+    multifd_channel_connect(p, ioc, err);
+}
+
+static void multifd_tls_channel_connect(MultiFDSendParams *p,
+                                        QIOChannel *ioc,
+                                        Error **errp)
+{
+    MigrationState *s = migrate_get_current();
+    const char *hostname = p->tls_hostname;
+    QIOChannelTLS *tioc;
+
+    tioc = migration_tls_client_create(s, ioc, hostname, errp);
+    if (!tioc) {
+        return;
+    }
+
+    qio_channel_set_name(QIO_CHANNEL(tioc), "multifd-tls-outgoing");
+    qio_channel_tls_handshake(tioc,
+                              multifd_tls_outgoing_handshake,
+                              p,
+                              NULL,
+                              NULL);
+
+}
+
+static bool multifd_channel_connect(MultiFDSendParams *p,
+                                    QIOChannel *ioc,
+                                    Error *error)
+{
+    MigrationState *s = migrate_get_current();
+
+    if (!error) {
+        if (s->parameters.tls_creds &&
+            *s->parameters.tls_creds &&
+            !object_dynamic_cast(OBJECT(ioc),
+                                 TYPE_QIO_CHANNEL_TLS)) {
+            multifd_tls_channel_connect(p, ioc, &error);
+            if (!error) {
+                /*
+                 * tls_channel_connect will call back to this
+                 * function after the TLS handshake,
+                 * so we mustn't call multifd_send_thread until then
+                 */
+                return false;
+            } else {
+                return true;
+            }
+        } else {
+            /* update for tls qio channel */
+            p->c = ioc;
+            qemu_thread_create(&p->thread, p->name, multifd_send_thread, p,
+                                   QEMU_THREAD_JOINABLE);
+       }
+       return false;
+    }
+
+    return true;
+}
+
 static void multifd_new_send_channel_cleanup(MultiFDSendParams *p,
                                              QIOChannel *ioc, Error *err)
 {
@@ -749,8 +821,9 @@ static void multifd_new_send_channel_async(QIOTask *task, gpointer opaque)
         p->c = QIO_CHANNEL(sioc);
         qio_channel_set_delay(p->c, false);
         p->running = true;
-        qemu_thread_create(&p->thread, p->name, multifd_send_thread, p,
+        if (multifd_channel_connect(p, sioc, local_err)) {
-                           QEMU_THREAD_JOINABLE);
+            goto cleanup;
+        }
         return;
     }