all: sync with master; upd chlog

internal/aghnet/interfaces_bsd.go

@@ -0,0 +1,38 @@
+//go:build darwin || freebsd || openbsd
+
+package aghnet
+
+import (
+	"context"
+	"net"
+	"os"
+	"syscall"
+
+	"github.com/AdguardTeam/golibs/errors"
+	"golang.org/x/sys/unix"
+)
+
+// reuseAddrCtrl is the function to be set to net.ListenConfig.Control.  It
+// configures the socket to have a reusable port binding.
+func reuseAddrCtrl(_, _ string, c syscall.RawConn) (err error) {
+	cerr := c.Control(func(fd uintptr) {
+		// TODO(e.burkov):  Consider using SO_REUSEPORT.
+		err = unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, unix.SO_REUSEADDR, 1)
+		if err != nil {
+			err = os.NewSyscallError("setsockopt", err)
+		}
+	})
+
+	err = errors.Join(err, cerr)
+
+	return errors.Annotate(err, "setting control options: %w")
+}
+
+// listenPacketReusable announces on the local network address additionally
+// configuring the socket to have a reusable binding.
+func listenPacketReusable(_, network, address string) (c net.PacketConn, err error) {
+	var lc net.ListenConfig
+	lc.Control = reuseAddrCtrl
+
+	return lc.ListenPacket(context.Background(), network, address)
+}