g10,agent: Support CONFIRM for --delete-key.

* agent/call-pinentry.c (agent_get_confirmation): Add call of
pinentry_loopback_confirm.
(agent_popup_message_start): Likewise.
(agent_popup_message_stop): Return if it's loopback mode.
* agent/command.c (pinentry_loopback_confirm): New.

* g10/call-agent.c (default_inq_cb): Support "CONFIRM" inquery
when PINENTRY_MODE_LOOPBACK mode.
(confirm_status_cb): New.
(agent_delete_key): Supply confirm_status_cb to set the description
string for confirmation.

--

In the Assuan communication, we introduce new interaction:

    [gpg]                            [gpg-agent]
            --- CMD: PKDECRYPT -->
            <-- STATUS: SETDESC "..."
            <-- STATUS: SETOK "..."
            <-- STATUS: SETNOTOK "..."
            <-- INQUERY: CONFIRM 0/1 (0 for display, 1 for user query)
	    --- INQUERY-result: -->
	    <-- RESULT: ...

GnuPG-bug-id: 3465
Signed-off-by: NIIBE Yutaka <[email protected]>

1 files changed, 15 insertions, 1 deletions

diff --git a/agent/call-pinentry.c b/agent/call-pinentry.c
index 487b21e81..c2105cd6e 100644
--- a/agent/call-pinentry.c
+++ b/agent/call-pinentry.c
@@ -1391,6 +1391,9 @@ agent_get_confirmation (ctrl_t ctrl,
       if (ctrl->pinentry_mode == PINENTRY_MODE_CANCEL)
         return gpg_error (GPG_ERR_CANCELED);
 
+      if (ctrl->pinentry_mode == PINENTRY_MODE_LOOPBACK)
+        return pinentry_loopback_confirm (ctrl, desc, 1, ok, notok);
+
       return gpg_error (GPG_ERR_NO_PIN_ENTRY);
     }
 
@@ -1486,7 +1489,15 @@ agent_popup_message_start (ctrl_t ctrl, const char *desc, const char *ok_btn)
   int err;
 
   if (ctrl->pinentry_mode != PINENTRY_MODE_ASK)
-    return gpg_error (GPG_ERR_CANCELED);
+    {
+      if (ctrl->pinentry_mode == PINENTRY_MODE_CANCEL)
+        return gpg_error (GPG_ERR_CANCELED);
+
+      if (ctrl->pinentry_mode == PINENTRY_MODE_LOOPBACK)
+        return pinentry_loopback_confirm (ctrl, desc, 0, ok_btn, NULL);
+
+      return gpg_error (GPG_ERR_NO_PIN_ENTRY);
+    }
 
   rc = start_pinentry (ctrl);
   if (rc)
@@ -1537,6 +1548,9 @@ agent_popup_message_stop (ctrl_t ctrl)
 
   (void)ctrl;
 
+  if (ctrl->pinentry_mode == PINENTRY_MODE_LOOPBACK)
+    return;
+
   if (!popup_tid || !entry_ctx)
     {
       log_debug ("agent_popup_message_stop called with no active popup\n");