93 lines
2.7 KiB
Go
93 lines
2.7 KiB
Go
// bootnode runs a bootstrap node for the Ethereum Discovery Protocol.
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package main
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import (
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"crypto/ecdsa"
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"encoding/hex"
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"flag"
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"net"
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"os"
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"github.com/ethereum/go-ethereum/crypto"
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"github.com/ethereum/go-ethereum/log"
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"github.com/ethereum/go-ethereum/p2p/discv5"
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)
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type bootnodes []*discv5.Node
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func (f *bootnodes) String() string {
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return "discv5 nodes"
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}
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// Set unmarshals enode into discv5.Node.
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func (f *bootnodes) Set(value string) error {
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n, err := discv5.ParseNode(value)
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if err != nil {
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return err
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}
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*f = append(*f, n)
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return nil
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}
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func main() {
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var (
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listenAddr = flag.String("addr", ":30301", "listen address")
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nodeKeyFile = flag.String("nodekey", "", "private key filename")
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keydata = flag.String("keydata", "", "hex encoded private key")
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verbosity = flag.Int("verbosity", int(log.LvlInfo), "log verbosity (0-9)")
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vmodule = flag.String("vmodule", "", "log verbosity pattern")
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nursery = bootnodes{}
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nodeKey *ecdsa.PrivateKey
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err error
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)
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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.")
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flag.Parse()
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glogger := log.NewGlogHandler(log.StreamHandler(os.Stderr, log.TerminalFormat(false)))
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glogger.Verbosity(log.Lvl(*verbosity))
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if err = glogger.Vmodule(*vmodule); err != nil {
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log.Crit("Failed to set glog verbosity", "value", *vmodule, "err", err)
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}
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log.Root().SetHandler(glogger)
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if len(*nodeKeyFile) == 0 && len(*keydata) == 0 {
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log.Crit("either `nodekey` or `keydata` must be provided")
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}
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if len(*nodeKeyFile) != 0 {
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nodeKey, err = crypto.LoadECDSA(*nodeKeyFile)
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if err != nil {
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log.Crit("Failed to load ecdsa key from", "file", *nodeKeyFile, "error", err)
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}
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} else if len(*keydata) != 0 {
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log.Warn("key will be visible in process list. should be used only for tests")
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key, err := hex.DecodeString(*keydata)
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if err != nil {
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log.Crit("unable to decode hex", "data", keydata, "error", err)
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}
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nodeKey, err = crypto.ToECDSA(key)
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if err != nil {
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log.Crit("unable to convert decoded hex into ecdsa.PrivateKey", "data", key, "error", err)
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}
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}
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addr, err := net.ResolveUDPAddr("udp", *listenAddr)
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if err != nil {
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log.Crit("Unable to resolve UDP", "address", *listenAddr, "error", err)
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}
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conn, err := net.ListenUDP("udp", addr)
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if err != nil {
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log.Crit("Unable to listen on udp", "address", addr, "error", err)
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}
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realaddr := conn.LocalAddr().(*net.UDPAddr)
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tab, err := discv5.ListenUDP(nodeKey, conn, realaddr, "", nil)
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if err != nil {
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log.Crit("Failed to create discovery v5 table:", "error", err)
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}
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defer tab.Close()
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if err := tab.SetFallbackNodes(nursery); err != nil {
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log.Crit("Failed to set fallback", "nodes", nursery, "error", err)
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}
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select {}
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}
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