/
main.go
77 lines (67 loc) · 1.95 KB
/
main.go
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// This binary is a simple rest API endpoint to calculate
// the ENR value of a node given its private key,ip address and port.
package main
import (
"crypto/ecdsa"
"encoding/hex"
"flag"
"net"
"github.com/ethereum/go-ethereum/p2p/enode"
"github.com/ethereum/go-ethereum/p2p/enr"
"github.com/libp2p/go-libp2p-core/crypto"
"github.com/prysmaticlabs/prysm/io/file"
_ "github.com/prysmaticlabs/prysm/runtime/maxprocs"
log "github.com/sirupsen/logrus"
)
var (
privateKey = flag.String("private", "", "Hex encoded Private key to use for calculation of ENR")
udpPort = flag.Int("udp-port", 0, "UDP Port to use for calculation of ENR")
tcpPort = flag.Int("tcp-port", 0, "TCP Port to use for calculation of ENR")
ipAddr = flag.String("ipAddress", "", "IP to use in calculation of ENR")
outfile = flag.String("out", "", "Filepath to write ENR")
)
func main() {
flag.Parse()
if *privateKey == "" {
log.Fatal("No private key given")
}
dst, err := hex.DecodeString(*privateKey)
if err != nil {
panic(err)
}
unmarshalledKey, err := crypto.UnmarshalSecp256k1PrivateKey(dst)
if err != nil {
panic(err)
}
ecdsaPrivKey := (*ecdsa.PrivateKey)(unmarshalledKey.(*crypto.Secp256k1PrivateKey))
if net.ParseIP(*ipAddr).To4() == nil {
log.Fatalf("Invalid ipv4 address given: %v\n", err)
}
if *udpPort == 0 {
log.Fatalf("Invalid udp port given: %v\n", err)
return
}
db, err := enode.OpenDB("")
if err != nil {
log.Fatalf("Could not open node's peer database: %v\n", err)
return
}
defer db.Close()
localNode := enode.NewLocalNode(db, ecdsaPrivKey)
ipEntry := enr.IP(net.ParseIP(*ipAddr))
udpEntry := enr.UDP(*udpPort)
localNode.Set(ipEntry)
localNode.Set(udpEntry)
if *tcpPort != 0 {
tcpEntry := enr.TCP(*tcpPort)
localNode.Set(tcpEntry)
}
log.Info(localNode.Node().String())
if *outfile != "" {
err := file.WriteFile(*outfile, []byte(localNode.Node().String()))
if err != nil {
panic(err)
}
log.Infof("Wrote to %s", *outfile)
}
}