From d7631dc39bb8b790c0a53b4954c960ee329446d5 Mon Sep 17 00:00:00 2001
From: Jason Volk <jason@zemos.net>
Date: Sun, 24 Mar 2019 20:47:15 -0700
Subject: [PATCH] ircd::server: Skip DNS resolution on IP literals.

---
 ircd/server.cc | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/ircd/server.cc b/ircd/server.cc
index a04f26075..eee589734 100644
--- a/ircd/server.cc
+++ b/ircd/server.cc
@@ -975,6 +975,16 @@ ircd::server::peer::resolve(const hostport &hostport,
 			"Unsupported DNS question type '%u' for resolve", opts.qtype
 		};
 
+	// Skip DNS resolution for IP literals
+	if(rfc3986::valid(std::nothrow, rfc3986::parser::ip_address, host(hostport)))
+	{
+		this->remote = {host(hostport), port(hostport)};
+		open_opts.ipport = this->remote;
+		open_opts.hostport = hostport;
+		open_links();
+		return;
+	}
+
 	auto handler
 	{
 		opts.qtype == 33?