fix: panic

README.md

@@ -3,7 +3,7 @@
 ![AppVeyor Build (with branch)](https://ci.appveyor.com/api/projects/status/github/optimism-java/shisui?branch=portal&svg=true)
 [![Discord](https://img.shields.io/badge/discord-join%20chat-blue.svg)](https://discord.gg/HBAgaHCBuY)
 
-Shisui is an [Ethereum portal client](https://github.com/ethereum/portal-network-specs) written in Go language based [go-ethereum](https://github.com/ethereum/go-ethereum) and [erigon](https://github.com/ledgerwatch/erigon).
+Shisui is an [Ethereum portal client](https://github.com/ethereum/portal-network-specs) written in Go language based on [go-ethereum](https://github.com/ethereum/go-ethereum).
 The name is inspired by Uchiha Shisui from the anime Naruto, who is renowned as "Shisui of the Body Flicker".
 
 > **Note:** Shisui is still **under heavy development** and is not yet ready for production use.
@@ -39,6 +39,19 @@ Alternatively, you can run the docker image by running
 docker run -d -p 8545:8545 -p 9009:9009/udp ghcr.io/optimism-java/shisui:latest
 ```
 
+### supported options
+
+* `--rpc.addr` HTTP-RPC server listening addr
+* `--rpc.port` HTTP-RPC server listening port(default: `8545`)
+* `--data.dir` data dir of where the data file located(default: `./`)
+* `--data.capacity` the capacity of the data stored, the unit is MB(default: `10GB`)
+* `--udp.addr` protocol UDP server listening interface(default: local ip)
+* `--udp.addr` protocol UDP server listening port(default: `9009`)
+* `--loglevel` loglevel of portal network, `1` to `5`, from `error` to `trace`(default: `1`)
+* `--private.key` private key of p2p node, hex format without `0x` prifix
+* `--bootnodes` bootnode of p2p network with ENR format
+* `--networks` portal sub networks: history, beacon, state
+
 ### Hardware Requirements
 
 Minimum:

cmd/utils/flags.go

@@ -1006,7 +1006,7 @@ Please note that --` + MetricsHTTPFlag.Name + ` must be set to start the server.
 
 	PortalPrivateKeyFlag = &cli.StringFlag{
 		Name:     "private.key",
-		Usage:    "private key of p2p node, hex format",
+		Usage:    "private key of p2p node, hex format without 0x prifix",
 		Category: flags.PortalNetworkCategory,
 	}
 

p2p/discover/portal_protocol.go

@@ -88,6 +88,8 @@ var ErrNilContentKey = errors.New("content key cannot be nil")
 
 var ContentNotFound = storage.ErrContentNotFound
 
+var ErrEmptyResp = errors.New("empty resp")
+
 var MaxDistance = hexutil.MustDecode("0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff")
 
 type ContentElement struct {
@@ -309,7 +311,11 @@ func (p *PortalProtocol) setupUDPListening() error {
 				}
 			}
 
-			p.Log.Trace("send to target data", "ip", target.IP().String(), "port", target.UDP(), "bufLength", len(buf))
+			if target == nil {
+				p.Log.Warn("not fount target node info", "ip", addr.IP.To4().String(), "port", addr.Port, "bufLength", len(buf))
+				return 0, fmt.Errorf("not found target node info")
+			}
+			p.Log.Trace("send to target data", "ip", addr.IP.To4().String(), "port", addr.Port, "bufLength", len(buf))
 			_, err := p.DiscV5.TalkRequest(target, string(portalwire.UTPNetwork), buf)
 			return len(buf), err
 		})
@@ -494,6 +500,9 @@ func (p *PortalProtocol) offer(node *enode.Node, offerRequest *OfferRequest) ([]
 
 func (p *PortalProtocol) processOffer(target *enode.Node, resp []byte, request *OfferRequest) ([]byte, error) {
 	var err error
+	if len(resp) == 0 {
+		return nil, ErrEmptyResp
+	}
 	if resp[0] != portalwire.ACCEPT {
 		return nil, fmt.Errorf("invalid accept response")
 	}
@@ -613,6 +622,10 @@ func (p *PortalProtocol) processOffer(target *enode.Node, resp []byte, request *
 }
 
 func (p *PortalProtocol) processContent(target *enode.Node, resp []byte) (byte, interface{}, error) {
+	if len(resp) == 0 {
+		return 0x00, nil, ErrEmptyResp
+	}
+
 	if resp[0] != portalwire.CONTENT {
 		return 0xff, nil, fmt.Errorf("invalid content response")
 	}
@@ -678,6 +691,10 @@ func (p *PortalProtocol) processContent(target *enode.Node, resp []byte) (byte,
 }
 
 func (p *PortalProtocol) processNodes(target *enode.Node, resp []byte, distances []uint) ([]*enode.Node, error) {
+	if len(resp) == 0 {
+		return nil, ErrEmptyResp
+	}
+
 	if resp[0] != portalwire.NODES {
 		return nil, fmt.Errorf("invalid nodes response")
 	}
@@ -731,7 +748,7 @@ func (p *PortalProtocol) filterNodes(target *enode.Node, enrs [][]byte, distance
 
 func (p *PortalProtocol) processPong(target *enode.Node, resp []byte) (*portalwire.Pong, error) {
 	if len(resp) == 0 {
-		return nil, fmt.Errorf("empty resp")
+		return nil, ErrEmptyResp
 	}
 	if resp[0] != portalwire.PONG {
 		return nil, fmt.Errorf("invalid pong response")