status-go/cmd/bootnode/main.go

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// bootnode runs a bootstrap node for the Ethereum Discovery Protocol.
package main
import (
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"crypto/ecdsa"
"encoding/hex"
"flag"
"fmt"
"net"
"os"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/p2p/discv5"
)
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var (
writeAddr = flag.Bool("writeaddress", false, "write out the node's public key and quit")
listenAddr = flag.String("addr", ":30301", "listen address")
genKeyFile = flag.String("genkey", "", "generate a node key")
nodeKeyFile = flag.String("nodekey", "", "private key filename")
keydata = flag.String("keydata", "", "hex encoded private key")
verbosity = flag.Int("verbosity", int(log.LvlInfo), "log verbosity (0-9)")
vmodule = flag.String("vmodule", "", "log verbosity pattern")
nursery = bootnodes{}
nodeKey *ecdsa.PrivateKey
err error
)
type bootnodes []*discv5.Node
func (f *bootnodes) String() string {
return "discv5 nodes"
}
// Set unmarshals enode into discv5.Node.
func (f *bootnodes) Set(value string) error {
n, err := discv5.ParseNode(value)
if err != nil {
return err
}
*f = append(*f, n)
return nil
}
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func main() { // nolint: gocyclo
flag.Var(&nursery, "n", "These nodes are used to connect to the network if the table is empty and there are no known nodes in the database.")
flag.Parse()
glogger := log.NewGlogHandler(log.StreamHandler(os.Stderr, log.TerminalFormat(false)))
glogger.Verbosity(log.Lvl(*verbosity))
if err = glogger.Vmodule(*vmodule); err != nil {
log.Crit("Failed to set glog verbosity", "value", *vmodule, "err", err)
}
log.Root().SetHandler(glogger)
if len(*genKeyFile) != 0 {
log.Info("Generating key file", "path", *genKeyFile)
key, err := crypto.GenerateKey()
if err != nil {
log.Crit("unable to generate key", "error", err)
}
if err := crypto.SaveECDSA(*genKeyFile, key); err != nil {
log.Crit("unable to save key", "error", err)
}
os.Exit(0)
}
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if len(*nodeKeyFile) == 0 && len(*keydata) == 0 {
log.Crit("either `nodekey` or `keydata` must be provided")
}
if len(*nodeKeyFile) != 0 {
nodeKey, err = crypto.LoadECDSA(*nodeKeyFile)
if err != nil {
log.Crit("Failed to load ecdsa key from", "file", *nodeKeyFile, "error", err)
}
} else if len(*keydata) != 0 {
log.Warn("key will be visible in process list. should be used only for tests")
key, err := hex.DecodeString(*keydata)
if err != nil {
log.Crit("unable to decode hex", "data", keydata, "error", err)
}
nodeKey, err = crypto.ToECDSA(key)
if err != nil {
log.Crit("unable to convert decoded hex into ecdsa.PrivateKey", "data", key, "error", err)
}
}
if *writeAddr {
// we remove the first uncompressed byte since it's not used in an enode address
fmt.Printf("%x\n", crypto.FromECDSAPub(&nodeKey.PublicKey)[1:])
os.Exit(0)
}
addr, err := net.ResolveUDPAddr("udp", *listenAddr)
if err != nil {
log.Crit("Unable to resolve UDP", "address", *listenAddr, "error", err)
}
conn, err := net.ListenUDP("udp", addr)
if err != nil {
log.Crit("Unable to listen on udp", "address", addr, "error", err)
}
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tab, err := discv5.ListenUDP(nodeKey, conn, "", nil)
if err != nil {
log.Crit("Failed to create discovery v5 table:", "error", err)
}
defer tab.Close()
if err := tab.SetFallbackNodes(nursery); err != nil {
log.Crit("Failed to set fallback", "nodes", nursery, "error", err)
}
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select {}
}