payload: limit the number of possible addresses

pkg/network/payload/address.go

@@ -10,6 +10,10 @@ import (
 	"github.com/nspcc-dev/neo-go/pkg/network/capability"
 )
 
+// MaxAddrsCount is the maximum number of addresses that could be packed into
+// one payload.
+const MaxAddrsCount = 200
+
 // AddressAndTime payload.
 type AddressAndTime struct {
 	Timestamp    uint32
@@ -75,7 +79,7 @@ func NewAddressList(n int) *AddressList {
 
 // DecodeBinary implements Serializable interface.
 func (p *AddressList) DecodeBinary(br *io.BinReader) {
-	br.ReadArray(&p.Addrs)
+	br.ReadArray(&p.Addrs, MaxAddrsCount)
 }
 
 // EncodeBinary implements Serializable interface.

pkg/network/server.go

@@ -29,7 +29,6 @@ const (
 	defaultAttemptConnPeers = 20
 	defaultMaxPeers         = 100
 	maxBlockBatch           = 200
-	maxAddrsToSend          = 200
 	minPoolCount            = 30
 )
 
@@ -690,8 +689,8 @@ func (s *Server) handleAddrCmd(p Peer, addrs *payload.AddressList) error {
 // handleGetAddrCmd sends to the peer some good addresses that we know of.
 func (s *Server) handleGetAddrCmd(p Peer) error {
 	addrs := s.discovery.GoodPeers()
-	if len(addrs) > maxAddrsToSend {
-		addrs = addrs[:maxAddrsToSend]
+	if len(addrs) > payload.MaxAddrsCount {
+		addrs = addrs[:payload.MaxAddrsCount]
 	}
 	alist := payload.NewAddressList(len(addrs))
 	ts := time.Now()