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/aghnet/net.go

@@ -10,9 +10,11 @@ import (
 	"net"
 	"net/netip"
 	"net/url"
+	"strings"
 	"syscall"
 
 	"github.com/AdguardTeam/AdGuardHome/internal/aghos"
+	"github.com/AdguardTeam/dnsproxy/upstream"
 	"github.com/AdguardTeam/golibs/errors"
 	"github.com/AdguardTeam/golibs/log"
 )
@@ -307,6 +309,50 @@ func ParseAddrPort(s string, defaultPort uint16) (ipp netip.AddrPort, err error)
 	return ipp, nil
 }
 
+// ParseSubnet parses s either as a CIDR prefix itself, or as an IP address,
+// returning the corresponding single-IP CIDR prefix.
+//
+// TODO(e.burkov):  Taken from dnsproxy, move to golibs.
+func ParseSubnet(s string) (p netip.Prefix, err error) {
+	if strings.Contains(s, "/") {
+		p, err = netip.ParsePrefix(s)
+		if err != nil {
+			return netip.Prefix{}, err
+		}
+	} else {
+		var ip netip.Addr
+		ip, err = netip.ParseAddr(s)
+		if err != nil {
+			return netip.Prefix{}, err
+		}
+
+		p = netip.PrefixFrom(ip, ip.BitLen())
+	}
+
+	return p, nil
+}
+
+// ParseBootstraps returns the slice of upstream resolvers parsed from addrs.
+// It additionally returns the closers for each resolver, that should be closed
+// after use.
+func ParseBootstraps(
+	addrs []string,
+	opts *upstream.Options,
+) (boots []*upstream.UpstreamResolver, err error) {
+	boots = make([]*upstream.UpstreamResolver, 0, len(boots))
+	for i, b := range addrs {
+		var r *upstream.UpstreamResolver
+		r, err = upstream.NewUpstreamResolver(b, opts)
+		if err != nil {
+			return nil, fmt.Errorf("bootstrap at index %d: %w", i, err)
+		}
+
+		boots = append(boots, r)
+	}
+
+	return boots, nil
+}
+
 // BroadcastFromPref calculates the broadcast IP address for p.
 func BroadcastFromPref(p netip.Prefix) (bc netip.Addr) {
 	bc = p.Addr().Unmap()