migration: convert tcp socket protocol to use QIOChannel

Drop the current TCP socket migration driver and extend
the new generic socket driver to cope with the TCP address
format

Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Message-Id: <1461751518-12128-15-git-send-email-berrange@redhat.com>
Signed-off-by: Amit Shah <amit.shah@redhat.com>

migration/Makefile.objs

-common-obj-y += migration.o tcp.o socket.o
+common-obj-y += migration.o socket.o
 common-obj-y += vmstate.o
 common-obj-y += qemu-file.o qemu-file-buf.o qemu-file-unix.o qemu-file-stdio.o
 common-obj-y += qemu-file-channel.o

migration/socket.c

@@ -25,6 +25,23 @@
 #include "trace.h"
 
 
+static SocketAddress *tcp_build_address(const char *host_port, Error **errp)
+{
+    InetSocketAddress *iaddr = inet_parse(host_port, errp);
+    SocketAddress *saddr;
+
+    if (!iaddr) {
+        return NULL;
+    }
+
+    saddr = g_new0(SocketAddress, 1);
+    saddr->type = SOCKET_ADDRESS_KIND_INET;
+    saddr->u.inet.data = iaddr;
+
+    return saddr;
+}
+
+
 static SocketAddress *unix_build_address(const char *path)
 {
     SocketAddress *saddr;
@@ -69,6 +86,14 @@ static void socket_start_outgoing_migration(MigrationState *s,
     qapi_free_SocketAddress(saddr);
 }
 
+void tcp_start_outgoing_migration(MigrationState *s,
+                                  const char *host_port,
+                                  Error **errp)
+{
+    SocketAddress *saddr = tcp_build_address(host_port, errp);
+    socket_start_outgoing_migration(s, saddr, errp);
+}
+
 void unix_start_outgoing_migration(MigrationState *s,
                                    const char *path,
                                    Error **errp)
@@ -125,6 +150,12 @@ static void socket_start_incoming_migration(SocketAddress *saddr,
     qapi_free_SocketAddress(saddr);
 }
 
+void tcp_start_incoming_migration(const char *host_port, Error **errp)
+{
+    SocketAddress *saddr = tcp_build_address(host_port, errp);
+    socket_start_incoming_migration(saddr, errp);
+}
+
 void unix_start_incoming_migration(const char *path, Error **errp)
 {
     SocketAddress *saddr = unix_build_address(path);

migration/tcp.c

-/*
- * QEMU live migration
- *
- * Copyright IBM, Corp. 2008
- *
- * Authors:
- *  Anthony Liguori   <aliguori@us.ibm.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 "qemu/sockets.h"
-#include "migration/migration.h"
-#include "migration/qemu-file.h"
-#include "block/block.h"
-#include "qemu/main-loop.h"
-
-//#define DEBUG_MIGRATION_TCP
-
-#ifdef DEBUG_MIGRATION_TCP
-#define DPRINTF(fmt, ...) \
-    do { printf("migration-tcp: " fmt, ## __VA_ARGS__); } while (0)
-#else
-#define DPRINTF(fmt, ...) \
-    do { } while (0)
-#endif
-
-static void tcp_wait_for_connect(int fd, Error *err, void *opaque)
-{
-    MigrationState *s = opaque;
-
-    if (fd < 0) {
-        DPRINTF("migrate connect error: %s\n", error_get_pretty(err));
-        s->to_dst_file = NULL;
-        migrate_fd_error(s, err);
-    } else {
-        DPRINTF("migrate connect success\n");
-        s->to_dst_file = qemu_fopen_socket(fd, "wb");
-        migrate_fd_connect(s);
-    }
-}
-
-void tcp_start_outgoing_migration(MigrationState *s, const char *host_port, Error **errp)
-{
-    inet_nonblocking_connect(host_port, tcp_wait_for_connect, s, errp);
-}
-
-static void tcp_accept_incoming_migration(void *opaque)
-{
-    struct sockaddr_in addr;
-    socklen_t addrlen = sizeof(addr);
-    int s = (intptr_t)opaque;
-    QEMUFile *f;
-    int c;
-
-    do {
-        c = qemu_accept(s, (struct sockaddr *)&addr, &addrlen);
-    } while (c < 0 && errno == EINTR);
-    qemu_set_fd_handler(s, NULL, NULL, NULL);
-    closesocket(s);
-
-    DPRINTF("accepted migration\n");
-
-    if (c < 0) {
-        error_report("could not accept migration connection (%s)",
-                     strerror(errno));
-        return;
-    }
-
-    f = qemu_fopen_socket(c, "rb");
-    if (f == NULL) {
-        error_report("could not qemu_fopen socket");
-        goto out;
-    }
-
-    process_incoming_migration(f);
-    return;
-
-out:
-    closesocket(c);
-}
-
-void tcp_start_incoming_migration(const char *host_port, Error **errp)
-{
-    int s;
-
-    s = inet_listen(host_port, NULL, 256, SOCK_STREAM, 0, errp);
-    if (s < 0) {
-        return;
-    }
-
-    qemu_set_fd_handler(s, tcp_accept_incoming_migration, NULL,
-                        (void *)(intptr_t)s);
-}