Pull request 2100: v0.107.42-rc

Squashed commit of the following:

commit 284190f748345c7556e60b67f051ec5f6f080948
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Wed Dec 6 19:36:00 2023 +0300

    all: sync with master; upd chlog

internal/next/dnssvc/config.go

@@ -0,0 +1,35 @@
+package dnssvc
+
+import (
+	"net/netip"
+	"time"
+)
+
+// Config is the AdGuard Home DNS service configuration structure.
+//
+// TODO(a.garipov): Add timeout for incoming requests.
+type Config struct {
+	// Addresses are the addresses on which to serve plain DNS queries.
+	Addresses []netip.AddrPort
+
+	// BootstrapServers are the addresses of DNS servers used for bootstrapping
+	// the upstream DNS server addresses.
+	BootstrapServers []string
+
+	// UpstreamServers are the upstream DNS server addresses to use.
+	UpstreamServers []string
+
+	// DNS64Prefixes is a slice of NAT64 prefixes to be used for DNS64.  See
+	// also [Config.UseDNS64].
+	DNS64Prefixes []netip.Prefix
+
+	// UpstreamTimeout is the timeout for upstream requests.
+	UpstreamTimeout time.Duration
+
+	// BootstrapPreferIPv6, if true, instructs the bootstrapper to prefer IPv6
+	// addresses to IPv4 ones when bootstrapping.
+	BootstrapPreferIPv6 bool
+
+	// UseDNS64, if true, enables DNS64 protection for incoming requests.
+	UseDNS64 bool
+}