qapi/monitor: allow VNC display id in set/expire_password

It is possible to specify more than one VNC server on the command line,
either with an explicit ID or the auto-generated ones à la "default",
"vnc2", "vnc3", ...

It is not possible to change the password on one of these extra VNC
displays though. Fix this by adding a "display" parameter to the
"set_password" and "expire_password" QMP and HMP commands.

For HMP, the display is specified using the "-d" value flag.

For QMP, the schema is updated to explicitly express the supported
variants of the commands with protocol-discriminated unions.

Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
[FE: update "Since: " from 6.2 to 7.0
     make @connected a common member of @SetPasswordOptions]
Signed-off-by: Fabian Ebner <f.ebner@proxmox.com>
Message-Id: <20220225084949.35746-4-f.ebner@proxmox.com>
Acked-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

2 files changed, 42 insertions, 32 deletions

diff --git a/monitor/hmp-cmds.c b/monitor/hmp-cmds.c
index ff78741b75..634968498b 100644
--- a/monitor/hmp-cmds.c
+++ b/monitor/hmp-cmds.c
@@ -1396,24 +1396,33 @@ void hmp_set_password(Monitor *mon, const QDict *qdict)
 {
     const char *protocol  = qdict_get_str(qdict, "protocol");
     const char *password  = qdict_get_str(qdict, "password");
+    const char *display = qdict_get_try_str(qdict, "display");
     const char *connected = qdict_get_try_str(qdict, "connected");
     Error *err = NULL;
-    DisplayProtocol proto;
-    SetPasswordAction conn;
 
-    proto = qapi_enum_parse(&DisplayProtocol_lookup, protocol,
-                            DISPLAY_PROTOCOL_VNC, &err);
+    SetPasswordOptions opts = {
+        .password = (char *)password,
+        .has_connected = !!connected,
+    };
+
+    opts.connected = qapi_enum_parse(&SetPasswordAction_lookup, connected,
+                                     SET_PASSWORD_ACTION_KEEP, &err);
     if (err) {
         goto out;
     }
 
-    conn = qapi_enum_parse(&SetPasswordAction_lookup, connected,
-                           SET_PASSWORD_ACTION_KEEP, &err);
+    opts.protocol = qapi_enum_parse(&DisplayProtocol_lookup, protocol,
+                                    DISPLAY_PROTOCOL_VNC, &err);
     if (err) {
         goto out;
     }
 
-    qmp_set_password(proto, password, !!connected, conn, &err);
+    if (opts.protocol == DISPLAY_PROTOCOL_VNC) {
+        opts.u.vnc.has_display = !!display;
+        opts.u.vnc.display = (char *)display;
+    }
+
+    qmp_set_password(&opts, &err);
 
 out:
     hmp_handle_error(mon, err);
@@ -1423,16 +1432,25 @@ void hmp_expire_password(Monitor *mon, const QDict *qdict)
 {
     const char *protocol  = qdict_get_str(qdict, "protocol");
     const char *whenstr = qdict_get_str(qdict, "time");
+    const char *display = qdict_get_try_str(qdict, "display");
     Error *err = NULL;
-    DisplayProtocol proto;
 
-    proto = qapi_enum_parse(&DisplayProtocol_lookup, protocol,
-                            DISPLAY_PROTOCOL_VNC, &err);
+    ExpirePasswordOptions opts = {
+        .time = (char *)whenstr,
+    };
+
+    opts.protocol = qapi_enum_parse(&DisplayProtocol_lookup, protocol,
+                                    DISPLAY_PROTOCOL_VNC, &err);
     if (err) {
         goto out;
     }
 
-    qmp_expire_password(proto, whenstr, &err);
+    if (opts.protocol == DISPLAY_PROTOCOL_VNC) {
+        opts.u.vnc.has_display = !!display;
+        opts.u.vnc.display = (char *)display;
+    }
+
+    qmp_expire_password(&opts, &err);
 
 out:
     hmp_handle_error(mon, err);
diff --git a/monitor/qmp-cmds.c b/monitor/qmp-cmds.c
index b6e8b57fcc..df97582dd4 100644
--- a/monitor/qmp-cmds.c
+++ b/monitor/qmp-cmds.c
@@ -168,35 +168,27 @@ void qmp_system_wakeup(Error **errp)
     qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER, errp);
 }
 
-void qmp_set_password(DisplayProtocol protocol, const char *password,
-                      bool has_connected, SetPasswordAction connected,
-                      Error **errp)
+void qmp_set_password(SetPasswordOptions *opts, Error **errp)
 {
-    int disconnect_if_connected = 0;
-    int fail_if_connected = 0;
     int rc;
 
-    if (has_connected) {
-        fail_if_connected = connected == SET_PASSWORD_ACTION_FAIL;
-        disconnect_if_connected = connected == SET_PASSWORD_ACTION_DISCONNECT;
-    }
-
-    if (protocol == DISPLAY_PROTOCOL_SPICE) {
+    if (opts->protocol == DISPLAY_PROTOCOL_SPICE) {
         if (!qemu_using_spice(errp)) {
             return;
         }
-        rc = qemu_spice.set_passwd(password, fail_if_connected,
-                                   disconnect_if_connected);
+        rc = qemu_spice.set_passwd(opts->password,
+                opts->connected == SET_PASSWORD_ACTION_FAIL,
+                opts->connected == SET_PASSWORD_ACTION_DISCONNECT);
     } else {
-        assert(protocol == DISPLAY_PROTOCOL_VNC);
-        if (fail_if_connected || disconnect_if_connected) {
+        assert(opts->protocol == DISPLAY_PROTOCOL_VNC);
+        if (opts->connected != SET_PASSWORD_ACTION_KEEP) {
             /* vnc supports "connected=keep" only */
             error_setg(errp, QERR_INVALID_PARAMETER, "connected");
             return;
         }
         /* Note that setting an empty password will not disable login through
          * this interface. */
-        rc = vnc_display_password(NULL, password);
+        rc = vnc_display_password(opts->u.vnc.display, opts->password);
     }
 
     if (rc != 0) {
@@ -204,11 +196,11 @@ void qmp_set_password(DisplayProtocol protocol, const char *password,
     }
 }
 
-void qmp_expire_password(DisplayProtocol protocol, const char *whenstr,
-                         Error **errp)
+void qmp_expire_password(ExpirePasswordOptions *opts, Error **errp)
 {
     time_t when;
     int rc;
+    const char *whenstr = opts->time;
 
     if (strcmp(whenstr, "now") == 0) {
         when = 0;
@@ -220,14 +212,14 @@ void qmp_expire_password(DisplayProtocol protocol, const char *whenstr,
         when = strtoull(whenstr, NULL, 10);
     }
 
-    if (protocol == DISPLAY_PROTOCOL_SPICE) {
+    if (opts->protocol == DISPLAY_PROTOCOL_SPICE) {
         if (!qemu_using_spice(errp)) {
             return;
         }
         rc = qemu_spice.set_pw_expire(when);
     } else {
-        assert(protocol == DISPLAY_PROTOCOL_VNC);
-        rc = vnc_display_pw_expire(NULL, when);
+        assert(opts->protocol == DISPLAY_PROTOCOL_VNC);
+        rc = vnc_display_pw_expire(opts->u.vnc.display, when);
     }
 
     if (rc != 0) {