From: Marek Vavruša <mvavrusa@cloudflare.com>
Date: Fri, 6 Apr 2018 05:48:51 +0000 (-0700)
Subject: add bindings for the checkout layer
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b63dd9a413e6f88d45d6c1d2155f2780dba3e8a4;p=thirdparty%2Fknot-resolver.git

add bindings for the checkout layer

This one was missing from the current bindings. The checkout layer
runs when the worker attempts to send a DNS query to given upstream
when the address is already determined. The layer can add EDNS options
or update outbound query, or block particular addresses / protocol.
---

diff --git a/lib/resolve.c b/lib/resolve.c
index af1f317f2..fd0312a5e 100644
--- a/lib/resolve.c
+++ b/lib/resolve.c
@@ -1537,7 +1537,9 @@ int kr_resolve_checkout(struct kr_request *request, struct sockaddr *src,
 	}
 	struct kr_query *qry = array_tail(rplan->pending);
 
-	/* Run the checkout layers and cancel on failure. */
+	/* Run the checkout layers and cancel on failure.
+	 * The checkout layer doesn't persist the state, so canceled subrequests
+	 * don't affect the resolution or rest of the processing. */
 	int state = request->state;
 	ITERATE_LAYERS(request, qry, checkout, packet, dst, type);
 	if (request->state == KR_STATE_FAIL) {