[Qemu-devel] [PATCH v5 4/4] use inet_listen()/inet_connect() to support ipv6 migration

[Amos Kong <akong@redhat.com>]

Use help functions in qemu-socket.c for tcp migration,
which already support ipv6 addresses.

For IPv6 brackets must be mandatory if you require a port.
Referencing to RFC5952, the recommended format is:

     [2312::8274]:5200

test status: Successed
listen side: qemu-kvm .... -incoming tcp:[2312::8274]:5200
client side: qemu-kvm ...
             (qemu) migrate -d tcp:[2312::8274]:5200

Signed-off-by: Amos Kong <akong@redhat.com>
---
 migration-tcp.c |   74 +++++++++++++++----------------------------------------
 1 files changed, 20 insertions(+), 54 deletions(-)

diff --git a/migration-tcp.c b/migration-tcp.c
index 35a5781..251d955 100644
--- a/migration-tcp.c
+++ b/migration-tcp.c
@@ -81,43 +81,32 @@ static void tcp_wait_for_connect(void *opaque)
 
 int tcp_start_outgoing_migration(MigrationState *s, const char *host_port)
 {
-    struct sockaddr_in addr;
-    int ret;
-
-    ret = parse_host_port(&addr, host_port);
-    if (ret < 0) {
-        return ret;
-    }
+    int err;
 
     s->get_error = socket_errno;
     s->write = socket_write;
     s->close = tcp_close;
 
-    s->fd = qemu_socket(PF_INET, SOCK_STREAM, 0);
-    if (s->fd == -1) {
-        DPRINTF("Unable to open socket");
-        return -socket_error();
-    }
-
-    socket_set_nonblock(s->fd);
+    s->fd = inet_connect(host_port, false);
+    err = -socket_error();
 
-    do {
-        ret = connect(s->fd, (struct sockaddr *)&addr, sizeof(addr));
-        if (ret == -1) {
-            ret = -socket_error();
-        }
-        if (ret == -EINPROGRESS || ret == -EWOULDBLOCK) {
-            qemu_set_fd_handler2(s->fd, NULL, NULL, tcp_wait_for_connect, s);
-            return 0;
+    if (err == -EINPROGRESS) {
+        DPRINTF("connect in progress");
+        qemu_set_fd_handler2(s->fd, NULL, NULL, tcp_wait_for_connect, s);
+#ifdef _WIN32
+    } else if (err == -WSAEALREADY || err == -WSAEINVAL) {
+        DPRINTF("connect in progress");
+        qemu_set_fd_handler2(s->fd, NULL, NULL, tcp_wait_for_connect, s);
+#endif
+    } else if (err < 0) {
+        DPRINTF("connect failed: %s\n", strerror(-err));
+        if (s->fd != -1) {
+            migrate_fd_error(s);
         }
-    } while (ret == -EINTR);
-
-    if (ret < 0) {
-        DPRINTF("connect failed\n");
-        migrate_fd_error(s);
-        return ret;
+        return err;
+    } else {
+        migrate_fd_connect(s);
     }
-    migrate_fd_connect(s);
     return 0;
 }
 
@@ -157,38 +146,15 @@ out2:
 
 int tcp_start_incoming_migration(const char *host_port)
 {
-    struct sockaddr_in addr;
-    int val;
     int s;
 
-    DPRINTF("Attempting to start an incoming migration\n");
-
-    if (parse_host_port(&addr, host_port) < 0) {
-        fprintf(stderr, "invalid host/port combination: %s\n", host_port);
-        return -EINVAL;
-    }
-
-    s = qemu_socket(PF_INET, SOCK_STREAM, 0);
-    if (s == -1) {
+    s = inet_listen(host_port, NULL, 256, SOCK_STREAM, 0);
+    if (s < 0) {
         return -socket_error();
     }
 
-    val = 1;
-    setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&val, sizeof(val));
-
-    if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) == -1) {
-        goto err;
-    }
-    if (listen(s, 1) == -1) {
-        goto err;
-    }
-
     qemu_set_fd_handler2(s, NULL, tcp_accept_incoming_migration, NULL,
                          (void *)(intptr_t)s);
 
     return 0;
-
-err:
-    close(s);
-    return -socket_error();
 }