scd: Support "acknowledge button" feature.

* scd/apdu.c (set_prompt_cb): New member function.
(set_prompt_cb_ccid_reader): New function.
(open_ccid_reader): Initialize with set_prompt_cb_ccid_reader.
(apdu_set_prompt_cb): New.
* scd/app.c (lock_app, unlock_app): Add call to apdu_set_prompt_cb.
* ccid-driver.c (ccid_set_prompt_cb): New.
(bulk_in): Call ->prompt_cb when timer extension.
* scd/command.c (popup_prompt): New.

--

Cherry-picked master commit of:
	7a5a4c4cac8709f7c413e94cd0b40f4123baa1e5

Signed-off-by: NIIBE Yutaka <[email protected]>

1 files changed, 28 insertions, 0 deletions

diff --git a/scd/command.c b/scd/command.c
index 66d9fb971..0a9654693 100644
--- a/scd/command.c
+++ b/scd/command.c
@@ -1898,6 +1898,34 @@ send_status_direct (ctrl_t ctrl, const char *keyword, const char *args)
 }
 
 
+void
+popup_prompt (void *opaque, int on)
+{
+  ctrl_t ctrl = opaque;
+
+  if (ctrl)
+    {
+      assuan_context_t ctx = ctrl->server_local->assuan_ctx;
+
+      if (ctx)
+        {
+          const char *cmd;
+          gpg_error_t err;
+          unsigned char *value;
+          size_t valuelen;
+
+          if (on)
+            cmd = "POPUPPINPADPROMPT --ack";
+          else
+            cmd = "DISMISSPINPADPROMPT";
+          err = assuan_inquire (ctx, cmd, &value, &valuelen, 100);
+          if (!err)
+            xfree (value);
+        }
+    }
+}
+
+
 /* Helper to send the clients a status change notification.  */
 void
 send_client_notifications (app_t app, int removal)