[master] Plugs a socket descriptor leak in OMAPI

Merges in rt46767.

RELNOTES

@@ -1254,6 +1254,11 @@ dhcp-users@lists.isc.org.
   to accomodate a change in behavior in BIND9 isc_heap_delete().
   [ISC-bugs #46719]
 
+- Plugged a socket descriptor leak in OMAPI, that can occur when there is
+  data pending to be written to an OMAPI connection, when the connection
+  is closed by the reader.
+  [ISc-Bugs #46767]
+
 			Changes since 4.2.0 (new features)
 
 - If a client renews before 'dhcp-cache-threshold' percent of its lease

omapip/buffer.c

@@ -565,6 +565,15 @@ isc_result_t omapi_connection_writer (omapi_object_t *h)
 			omapi_buffer_dereference (&buffer, MDL);
 		}
 	}
+
+	/* If we had data left to write when we're told to disconnect,
+	* we need recall disconnect, now that we're done writing.
+	* See rt46767. */
+	if (c->out_bytes == 0 && c->state == omapi_connection_disconnecting) {
+		omapi_disconnect (h, 1);
+		return ISC_R_SHUTTINGDOWN;
+	}
+
 	return ISC_R_SUCCESS;
 }
 

omapip/message.c

@@ -339,7 +339,7 @@ isc_result_t omapi_message_unregister (omapi_object_t *mo)
 }
 
 #ifdef DEBUG_PROTOCOL
-static const char *omapi_message_op_name(int op) {
+const char *omapi_message_op_name(int op) {
 	switch (op) {
 	case OMAPI_OP_OPEN:    return "OMAPI_OP_OPEN";
 	case OMAPI_OP_REFRESH: return "OMAPI_OP_REFRESH";