mirror of https://github.com/guggero/chantools
Add dumpbackup command
Oliver Gugger
4 years ago
parent
ffa06a0598
commit
8f2c8db310
@ -0,0 +1,58 @@
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package chantools
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import (
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"net"
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"github.com/btcsuite/btcutil"
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"github.com/davecgh/go-spew/spew"
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"github.com/lightningnetwork/lnd/chanbackup"
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"github.com/lightningnetwork/lnd/lnwire"
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)
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type dumpMulti struct {
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Version chanbackup.MultiBackupVersion
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StaticBackups []dumpSingle
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}
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// dumpSingle is the information we want to dump from an lnd channel backup.
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// See `chanbackup.Single` for information about the fields.
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type dumpSingle struct {
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Version chanbackup.SingleBackupVersion
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IsInitiator bool
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ChainHash string
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FundingOutpoint string
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ShortChannelID lnwire.ShortChannelID
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RemoteNodePub string
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Addresses []net.Addr
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Capacity btcutil.Amount
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LocalChanCfg dumpChanCfg
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RemoteChanCfg dumpChanCfg
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ShaChainRootDesc dumpDescriptor
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}
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func dumpChannelBackup(multi *chanbackup.Multi) error {
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dumpSingles := make([]dumpSingle, len(multi.StaticBackups))
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for idx, single := range multi.StaticBackups {
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dumpSingles[idx] = dumpSingle{
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Version: single.Version,
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IsInitiator: single.IsInitiator,
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ChainHash: single.ChainHash.String(),
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FundingOutpoint: single.FundingOutpoint.String(),
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ShortChannelID: single.ShortChannelID,
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RemoteNodePub: pubKeyToString(single.RemoteNodePub),
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Addresses: single.Addresses,
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Capacity: single.Capacity,
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LocalChanCfg: toDumpChanCfg(single.LocalChanCfg),
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RemoteChanCfg: toDumpChanCfg(single.RemoteChanCfg),
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ShaChainRootDesc: toDumpDescriptor(
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single.ShaChainRootDesc,
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),
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}
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}
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spew.Dump(dumpMulti{
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Version: multi.Version,
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StaticBackups: dumpSingles,
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})
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return nil
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}
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@ -0,0 +1,57 @@
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package chantools
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import (
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"encoding/hex"
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"fmt"
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"github.com/btcsuite/btcd/btcec"
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"github.com/lightningnetwork/lnd/channeldb"
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"github.com/lightningnetwork/lnd/keychain"
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)
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const (
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lndInternalDerivationPath = "m/1017'/0'/%d'/0/%d"
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)
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// dumpChanCfg is the information we want to dump from a channel configuration.
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// See `channeldb.ChannelConfig` for more information about the fields.
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type dumpChanCfg struct {
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channeldb.ChannelConstraints
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MultiSigKey dumpDescriptor
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RevocationBasePoint dumpDescriptor
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PaymentBasePoint dumpDescriptor
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DelayBasePoint dumpDescriptor
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HtlcBasePoint dumpDescriptor
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}
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type dumpDescriptor struct {
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Path string
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Pubkey string
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}
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func toDumpChanCfg(cfg channeldb.ChannelConfig) dumpChanCfg {
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return dumpChanCfg{
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ChannelConstraints: cfg.ChannelConstraints,
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MultiSigKey: toDumpDescriptor(cfg.MultiSigKey),
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RevocationBasePoint: toDumpDescriptor(cfg.RevocationBasePoint),
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PaymentBasePoint: toDumpDescriptor(cfg.PaymentBasePoint),
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DelayBasePoint: toDumpDescriptor(cfg.DelayBasePoint),
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HtlcBasePoint: toDumpDescriptor(cfg.HtlcBasePoint),
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}
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}
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func toDumpDescriptor(desc keychain.KeyDescriptor) dumpDescriptor {
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return dumpDescriptor{
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Path: fmt.Sprintf(
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lndInternalDerivationPath, desc.Family, desc.Index,
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),
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Pubkey: pubKeyToString(desc.PubKey),
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}
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}
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func pubKeyToString(pubkey *btcec.PublicKey) string {
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if pubkey == nil {
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return "<nil>"
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}
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return hex.EncodeToString(pubkey.SerializeCompressed())
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}
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@ -0,0 +1,66 @@
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package chantools
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import (
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"github.com/btcsuite/btcd/chaincfg"
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"github.com/btcsuite/btcutil/hdkeychain"
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"github.com/lightningnetwork/lnd/keychain"
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)
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const (
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hardenedKeyStart = uint32(hdkeychain.HardenedKeyStart)
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)
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func deriveChildren(key *hdkeychain.ExtendedKey, path []uint32) (
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*hdkeychain.ExtendedKey, error) {
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var (
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currentKey = key
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err error
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)
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for _, pathPart := range path {
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currentKey, err = currentKey.Child(pathPart)
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if err != nil {
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return nil, err
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}
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}
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return currentKey, nil
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}
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type channelBackupEncryptionRing struct {
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extendedKey *hdkeychain.ExtendedKey
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chainParams *chaincfg.Params
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}
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func (r *channelBackupEncryptionRing) DeriveNextKey(_ keychain.KeyFamily) (
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keychain.KeyDescriptor, error) {
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return keychain.KeyDescriptor{}, nil
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}
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func (r *channelBackupEncryptionRing) DeriveKey(keyLoc keychain.KeyLocator) (
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keychain.KeyDescriptor, error) {
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var empty = keychain.KeyDescriptor{}
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keyBackup, err := deriveChildren(r.extendedKey, []uint32{
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hardenedKeyStart + uint32(keychain.BIP0043Purpose),
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hardenedKeyStart + r.chainParams.HDCoinType,
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hardenedKeyStart + uint32(keyLoc.Family),
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0,
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keyLoc.Index,
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})
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if err != nil {
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return empty, err
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}
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backupPubKey, err := keyBackup.ECPubKey()
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if err != nil {
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return empty, err
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}
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return keychain.KeyDescriptor{
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KeyLocator: keychain.KeyLocator{
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Family: keyLoc.Family,
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Index: keyLoc.Index,
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},
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PubKey: backupPubKey,
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}, nil
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}
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