[PATCH 06/13] char-udp: Implement compat code for CLI QAPIfication

[Kevin Wolf <kwolf@redhat.com>]

UDP backends have a few differences between CLI and QMP. This adds
QAPI aliases and a .translate_legacy_options() implementation that
converts CLI inputs to a form that's usable for a QAPIfied --chardev.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 qapi/char.json     |  7 ++++++-
 chardev/char-udp.c | 33 +++++++++++++++++++++++++++++++++
 chardev/char.c     |  1 -
 3 files changed, 39 insertions(+), 2 deletions(-)

diff --git a/qapi/char.json b/qapi/char.json
index 1930e90e95..e1f9347044 100644
--- a/qapi/char.json
+++ b/qapi/char.json
@@ -303,7 +303,12 @@
 { 'struct': 'ChardevUdp',
   'data': { 'remote': 'SocketAddressLegacy',
             '*local': 'SocketAddressLegacy' },
-  'base': 'ChardevCommon' }
+  'base': 'ChardevCommon',
+  'aliases': [
+    { 'source': ['remote'] },
+    { 'alias': 'localaddr', 'source': ['local', 'host'] },
+    { 'alias': 'localport', 'source': ['local', 'port'] }
+  ]}
 
 ##
 # @ChardevMux:
diff --git a/chardev/char-udp.c b/chardev/char-udp.c
index 16b5dbce58..61752b1c51 100644
--- a/chardev/char-udp.c
+++ b/chardev/char-udp.c
@@ -23,9 +23,11 @@
  */
 
 #include "qemu/osdep.h"
+#include "block/qdict.h"
 #include "chardev/char.h"
 #include "io/channel-socket.h"
 #include "qapi/error.h"
+#include "qapi/qmp/qdict.h"
 #include "qemu/module.h"
 #include "qemu/option.h"
 
@@ -190,6 +192,36 @@ static void qemu_chr_parse_udp(QemuOpts *opts, ChardevBackend *backend,
     }
 }
 
+static void qemu_chr_translate_udp(QDict *args)
+{
+    QDict *remote;
+    QDict *local;
+
+    /*
+     * If "local" or "remote" are given, it's not a legacy command line.
+     * Not translating in this case saves us checking whether an alias is
+     * already given before applying defaults.
+     */
+    if (qdict_haskey(args, "local") || qdict_haskey(args, "remote")) {
+        return;
+    }
+
+    remote = qdict_new();
+    qdict_put_str(remote, "type", "inet");
+    qdict_put(args, "remote", remote);
+
+    qdict_set_default_str(args, "host", "localhost");
+
+    if (qdict_haskey(args, "localaddr") || qdict_haskey(args, "localport")) {
+        local = qdict_new();
+        qdict_put_str(local, "type", "inet");
+        qdict_put(args, "local", local);
+
+        qdict_set_default_str(args, "localaddr", "");
+        qdict_set_default_str(args, "localport", "0");
+    }
+}
+
 static void qmp_chardev_open_udp(Chardev *chr,
                                  ChardevBackend *backend,
                                  bool *be_opened,
@@ -225,6 +257,7 @@ static void char_udp_class_init(ObjectClass *oc, void *data)
     ChardevClass *cc = CHARDEV_CLASS(oc);
 
     cc->parse = qemu_chr_parse_udp;
+    cc->translate_legacy_options = qemu_chr_translate_udp;
     cc->open = qmp_chardev_open_udp;
     cc->chr_write = udp_chr_write;
     cc->chr_update_read_handler = udp_chr_update_read_handler;
diff --git a/chardev/char.c b/chardev/char.c
index 91b44e53b6..99feaae275 100644
--- a/chardev/char.c
+++ b/chardev/char.c
@@ -744,7 +744,6 @@ void qemu_chr_translate_legacy_options(QDict *args)
     /*
      * TODO:
      * All backend types: "mux"
-     * udp: defaults for "host"/"localaddr"/"localport"
      */
 }
 
-- 
2.28.0