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config.go
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// Copyright (c) 2013-2017 The btcsuite developers
// Copyright (c) 2015-2016 The Decred developers
// Copyright (C) 2015-2020 The Lightning Network Developers
package lnd
import (
"errors"
"fmt"
"io/ioutil"
"net"
"os"
"os/user"
"path"
"path/filepath"
"regexp"
"strconv"
"strings"
"time"
"github.com/btcsuite/btcutil"
flags "github.com/jessevdk/go-flags"
"github.com/lightningnetwork/lnd/autopilot"
"github.com/lightningnetwork/lnd/build"
"github.com/lightningnetwork/lnd/chanbackup"
"github.com/lightningnetwork/lnd/channeldb"
"github.com/lightningnetwork/lnd/discovery"
"github.com/lightningnetwork/lnd/htlcswitch"
"github.com/lightningnetwork/lnd/htlcswitch/hodl"
"github.com/lightningnetwork/lnd/lncfg"
"github.com/lightningnetwork/lnd/lnrpc/routerrpc"
"github.com/lightningnetwork/lnd/lnrpc/signrpc"
"github.com/lightningnetwork/lnd/routing"
"github.com/lightningnetwork/lnd/tor"
)
const (
defaultDataDirname = "data"
defaultChainSubDirname = "chain"
defaultGraphSubDirname = "graph"
defaultTowerSubDirname = "watchtower"
defaultTLSCertFilename = "tls.cert"
defaultTLSKeyFilename = "tls.key"
defaultAdminMacFilename = "admin.macaroon"
defaultReadMacFilename = "readonly.macaroon"
defaultInvoiceMacFilename = "invoice.macaroon"
defaultLogLevel = "info"
defaultLogDirname = "logs"
defaultLogFilename = "lnd.log"
defaultRPCPort = 10009
defaultRESTPort = 8080
defaultPeerPort = 9735
defaultRPCHost = "localhost"
defaultNoSeedBackup = false
defaultPaymentsExpirationGracePeriod = time.Duration(0)
defaultTrickleDelay = 90 * 1000
defaultChanStatusSampleInterval = time.Minute
defaultChanEnableTimeout = 19 * time.Minute
defaultChanDisableTimeout = 20 * time.Minute
defaultMaxLogFiles = 3
defaultMaxLogFileSize = 10
defaultMinBackoff = time.Second
defaultMaxBackoff = time.Hour
defaultTorSOCKSPort = 9050
defaultTorDNSHost = "soa.nodes.lightning.directory"
defaultTorDNSPort = 53
defaultTorControlPort = 9051
defaultTorV2PrivateKeyFilename = "v2_onion_private_key"
defaultTorV3PrivateKeyFilename = "v3_onion_private_key"
// minTimeLockDelta is the minimum timelock we require for incoming
// HTLCs on our channels.
minTimeLockDelta = 4
// defaultAcceptorTimeout is the time after which an RPCAcceptor will time
// out and return false if it hasn't yet received a response.
defaultAcceptorTimeout = 15 * time.Second
defaultAlias = ""
defaultColor = "#3399FF"
// defaultZkMode is whether we start zkLND as a regular LND node, or as
// a zkLND mode running zkChannels.
defaultZkMode = true
)
var (
// DefaultLndDir is the default directory where lnd tries to find its
// configuration file and store its data. This is a directory in the
// user's application data, for example:
// C:\Users\<username>\AppData\Local\Lnd on Windows
// ~/.lnd on Linux
// ~/Library/Application Support/Lnd on MacOS
DefaultLndDir = btcutil.AppDataDir("lnd", false)
// DefaultConfigFile is the default full path of lnd's configuration
// file.
DefaultConfigFile = filepath.Join(DefaultLndDir, lncfg.DefaultConfigFilename)
defaultDataDir = filepath.Join(DefaultLndDir, defaultDataDirname)
defaultLogDir = filepath.Join(DefaultLndDir, defaultLogDirname)
defaultTowerDir = filepath.Join(defaultDataDir, defaultTowerSubDirname)
defaultTLSCertPath = filepath.Join(DefaultLndDir, defaultTLSCertFilename)
defaultTLSKeyPath = filepath.Join(DefaultLndDir, defaultTLSKeyFilename)
defaultBtcdDir = btcutil.AppDataDir("btcd", false)
defaultBtcdRPCCertFile = filepath.Join(defaultBtcdDir, "rpc.cert")
defaultLtcdDir = btcutil.AppDataDir("ltcd", false)
defaultLtcdRPCCertFile = filepath.Join(defaultLtcdDir, "rpc.cert")
defaultBitcoindDir = btcutil.AppDataDir("bitcoin", false)
defaultLitecoindDir = btcutil.AppDataDir("litecoin", false)
defaultTorSOCKS = net.JoinHostPort("localhost", strconv.Itoa(defaultTorSOCKSPort))
defaultTorDNS = net.JoinHostPort(defaultTorDNSHost, strconv.Itoa(defaultTorDNSPort))
defaultTorControl = net.JoinHostPort("localhost", strconv.Itoa(defaultTorControlPort))
// bitcoindEsimateModes defines all the legal values for bitcoind's
// estimatesmartfee RPC call.
defaultBitcoindEstimateMode = "CONSERVATIVE"
bitcoindEstimateModes = [2]string{"ECONOMICAL", defaultBitcoindEstimateMode}
)
// Config defines the configuration options for lnd.
//
// See LoadConfig for further details regarding the configuration
// loading+parsing process.
type Config struct {
ShowVersion bool `short:"V" long:"version" description:"Display version information and exit"`
LndDir string `long:"lnddir" description:"The base directory that contains lnd's data, logs, configuration file, etc."`
ConfigFile string `short:"C" long:"configfile" description:"Path to configuration file"`
DataDir string `short:"b" long:"datadir" description:"The directory to store lnd's data within"`
SyncFreelist bool `long:"sync-freelist" description:"Whether the databases used within lnd should sync their freelist to disk. This is disabled by default resulting in improved memory performance during operation, but with an increase in startup time."`
TLSCertPath string `long:"tlscertpath" description:"Path to write the TLS certificate for lnd's RPC and REST services"`
TLSKeyPath string `long:"tlskeypath" description:"Path to write the TLS private key for lnd's RPC and REST services"`
TLSExtraIPs []string `long:"tlsextraip" description:"Adds an extra ip to the generated certificate"`
TLSExtraDomains []string `long:"tlsextradomain" description:"Adds an extra domain to the generated certificate"`
TLSAutoRefresh bool `long:"tlsautorefresh" description:"Re-generate TLS certificate and key if the IPs or domains are changed"`
NoMacaroons bool `long:"no-macaroons" description:"Disable macaroon authentication"`
AdminMacPath string `long:"adminmacaroonpath" description:"Path to write the admin macaroon for lnd's RPC and REST services if it doesn't exist"`
ReadMacPath string `long:"readonlymacaroonpath" description:"Path to write the read-only macaroon for lnd's RPC and REST services if it doesn't exist"`
InvoiceMacPath string `long:"invoicemacaroonpath" description:"Path to the invoice-only macaroon for lnd's RPC and REST services if it doesn't exist"`
LogDir string `long:"logdir" description:"Directory to log output."`
MaxLogFiles int `long:"maxlogfiles" description:"Maximum logfiles to keep (0 for no rotation)"`
MaxLogFileSize int `long:"maxlogfilesize" description:"Maximum logfile size in MB"`
AcceptorTimeout time.Duration `long:"acceptortimeout" description:"Time after which an RPCAcceptor will time out and return false if it hasn't yet received a response"`
// We'll parse these 'raw' string arguments into real net.Addrs in the
// loadConfig function. We need to expose the 'raw' strings so the
// command line library can access them.
// Only the parsed net.Addrs should be used!
RawRPCListeners []string `long:"rpclisten" description:"Add an interface/port/socket to listen for RPC connections"`
RawRESTListeners []string `long:"restlisten" description:"Add an interface/port/socket to listen for REST connections"`
RawListeners []string `long:"listen" description:"Add an interface/port to listen for peer connections"`
RawExternalIPs []string `long:"externalip" description:"Add an ip:port to the list of local addresses we claim to listen on to peers. If a port is not specified, the default (9735) will be used regardless of other parameters"`
RPCListeners []net.Addr
RESTListeners []net.Addr
Listeners []net.Addr
ExternalIPs []net.Addr
DisableListen bool `long:"nolisten" description:"Disable listening for incoming peer connections"`
DisableRest bool `long:"norest" description:"Disable REST API"`
NAT bool `long:"nat" description:"Toggle NAT traversal support (using either UPnP or NAT-PMP) to automatically advertise your external IP address to the network -- NOTE this does not support devices behind multiple NATs"`
MinBackoff time.Duration `long:"minbackoff" description:"Shortest backoff when reconnecting to persistent peers. Valid time units are {s, m, h}."`
MaxBackoff time.Duration `long:"maxbackoff" description:"Longest backoff when reconnecting to persistent peers. Valid time units are {s, m, h}."`
DebugLevel string `short:"d" long:"debuglevel" description:"Logging level for all subsystems {trace, debug, info, warn, error, critical} -- You may also specify <subsystem>=<level>,<subsystem2>=<level>,... to set the log level for individual subsystems -- Use show to list available subsystems"`
CPUProfile string `long:"cpuprofile" description:"Write CPU profile to the specified file"`
Profile string `long:"profile" description:"Enable HTTP profiling on given port -- NOTE port must be between 1024 and 65535"`
UnsafeDisconnect bool `long:"unsafe-disconnect" description:"DEPRECATED: Allows the rpcserver to intentionally disconnect from peers with open channels. THIS FLAG WILL BE REMOVED IN 0.10.0"`
UnsafeReplay bool `long:"unsafe-replay" description:"Causes a link to replay the adds on its commitment txn after starting up, this enables testing of the sphinx replay logic."`
MaxPendingChannels int `long:"maxpendingchannels" description:"The maximum number of incoming pending channels permitted per peer."`
BackupFilePath string `long:"backupfilepath" description:"The target location of the channel backup file"`
Bitcoin *lncfg.Chain `group:"Bitcoin" namespace:"bitcoin"`
BtcdMode *lncfg.Btcd `group:"btcd" namespace:"btcd"`
BitcoindMode *lncfg.Bitcoind `group:"bitcoind" namespace:"bitcoind"`
NeutrinoMode *lncfg.Neutrino `group:"neutrino" namespace:"neutrino"`
Litecoin *lncfg.Chain `group:"Litecoin" namespace:"litecoin"`
LtcdMode *lncfg.Btcd `group:"ltcd" namespace:"ltcd"`
LitecoindMode *lncfg.Bitcoind `group:"litecoind" namespace:"litecoind"`
Autopilot *lncfg.AutoPilot `group:"Autopilot" namespace:"autopilot"`
Tor *lncfg.Tor `group:"Tor" namespace:"tor"`
SubRPCServers *subRPCServerConfigs `group:"subrpc"`
Hodl *hodl.Config `group:"hodl" namespace:"hodl"`
NoNetBootstrap bool `long:"nobootstrap" description:"If true, then automatic network bootstrapping will not be attempted."`
NoSeedBackup bool `long:"noseedbackup" description:"If true, NO SEED WILL BE EXPOSED AND THE WALLET WILL BE ENCRYPTED USING THE DEFAULT PASSPHRASE -- EVER. THIS FLAG IS ONLY FOR TESTING AND IS BEING DEPRECATED."`
PaymentsExpirationGracePeriod time.Duration `long:"payments-expiration-grace-period" description:"A period to wait before force closing channels with outgoing htlcs that have timed-out and are a result of this node initiated payments."`
TrickleDelay int `long:"trickledelay" description:"Time in milliseconds between each release of announcements to the network"`
ChanEnableTimeout time.Duration `long:"chan-enable-timeout" description:"The duration that a peer connection must be stable before attempting to send a channel update to reenable or cancel a pending disables of the peer's channels on the network."`
ChanDisableTimeout time.Duration `long:"chan-disable-timeout" description:"The duration that must elapse after first detecting that an already active channel is actually inactive and sending channel update disabling it to the network. The pending disable can be canceled if the peer reconnects and becomes stable for chan-enable-timeout before the disable update is sent."`
ChanStatusSampleInterval time.Duration `long:"chan-status-sample-interval" description:"The polling interval between attempts to detect if an active channel has become inactive due to its peer going offline."`
Alias string `long:"alias" description:"The node alias. Used as a moniker by peers and intelligence services"`
Color string `long:"color" description:"The color of the node in hex format (i.e. '#3399FF'). Used to customize node appearance in intelligence services"`
MinChanSize int64 `long:"minchansize" description:"The smallest channel size (in satoshis) that we should accept. Incoming channels smaller than this will be rejected"`
NumGraphSyncPeers int `long:"numgraphsyncpeers" description:"The number of peers that we should receive new graph updates from. This option can be tuned to save bandwidth for light clients or routing nodes."`
HistoricalSyncInterval time.Duration `long:"historicalsyncinterval" description:"The polling interval between historical graph sync attempts. Each historical graph sync attempt ensures we reconcile with the remote peer's graph from the genesis block."`
IgnoreHistoricalGossipFilters bool `long:"ignore-historical-gossip-filters" description:"If true, will not reply with historical data that matches the range specified by a remote peer's gossip_timestamp_filter. Doing so will result in lower memory and bandwidth requirements."`
RejectPush bool `long:"rejectpush" description:"If true, lnd will not accept channel opening requests with non-zero push amounts. This should prevent accidental pushes to merchant nodes."`
RejectHTLC bool `long:"rejecthtlc" description:"If true, lnd will not forward any HTLCs that are meant as onward payments. This option will still allow lnd to send HTLCs and receive HTLCs but lnd won't be used as a hop."`
StaggerInitialReconnect bool `long:"stagger-initial-reconnect" description:"If true, will apply a randomized staggering between 0s and 30s when reconnecting to persistent peers on startup. The first 10 reconnections will be attempted instantly, regardless of the flag's value"`
MaxOutgoingCltvExpiry uint32 `long:"max-cltv-expiry" description:"The maximum number of blocks funds could be locked up for when forwarding payments."`
MaxChannelFeeAllocation float64 `long:"max-channel-fee-allocation" description:"The maximum percentage of total funds that can be allocated to a channel's commitment fee. This only applies for the initiator of the channel. Valid values are within [0.1, 1]."`
DryRunMigration bool `long:"dry-run-migration" description:"If true, lnd will abort committing a migration if it would otherwise have been successful. This leaves the database unmodified, and still compatible with the previously active version of lnd."`
net tor.Net
EnableUpfrontShutdown bool `long:"enable-upfront-shutdown" description:"If true, option upfront shutdown script will be enabled. If peers that we open channels with support this feature, we will automatically set the script to which cooperative closes should be paid out to on channel open. This offers the partial protection of a channel peer disconnecting from us if cooperative close is attempted with a different script."`
AcceptKeySend bool `long:"accept-keysend" description:"If true, spontaneous payments through keysend will be accepted. [experimental]"`
Routing *routing.Conf `group:"routing" namespace:"routing"`
Workers *lncfg.Workers `group:"workers" namespace:"workers"`
Caches *lncfg.Caches `group:"caches" namespace:"caches"`
Prometheus lncfg.Prometheus `group:"prometheus" namespace:"prometheus"`
WtClient *lncfg.WtClient `group:"wtclient" namespace:"wtclient"`
Watchtower *lncfg.Watchtower `group:"watchtower" namespace:"watchtower"`
ProtocolOptions *lncfg.ProtocolOptions `group:"protocol" namespace:"protocol"`
AllowCircularRoute bool `long:"allow-circular-route" description:"If true, our node will allow htlc forwards that arrive and depart on the same channel."`
DB *lncfg.DB `group:"db" namespace:"db"`
// registeredChains keeps track of all chains that have been registered
// with the daemon.
registeredChains *chainRegistry
// ########### ln-mpc ###########
zkMode bool `long:"zkmode" description:"If true, the node will load as a zkLND Node. If false, it'll run as a regular LND node."`
ZkMerchant bool `long:"zkmerchant" description:"If true, the node initialize as a merchant. Otherwise it'll initialize as a customer"`
selfDelay int16 `long:"selfdelay" description:"the number of blocks to wait before a closing transaction output to self can be claimed by the broadcaster."`
minFee int64 `long:"minfee" description:"Minimum allowed tx fee for closing transactions."`
maxFee int64 `long:"maxfee" description:"Maximum allowed tx fee for closing transactions."`
valCpfp int64 `long:"valcpfp" description:"The value in satoshis of the child (aka anchor) output in closing transaction."`
balMinCust int64 `long:"balmincust" description:"The minimum allowed customer balance in satoshis."`
balMinMerch int64 `long:"balminmerch" description:"The minimum allowed merchant balance in satoshis."`
// ########### ln-mpc ###########
// networkDir is the path to the directory of the currently active
// network. This path will hold the files related to each different
// network.
networkDir string
}
// DefaultConfig returns all default values for the Config struct.
func DefaultConfig() Config {
return Config{
LndDir: DefaultLndDir,
ConfigFile: DefaultConfigFile,
DataDir: defaultDataDir,
DebugLevel: defaultLogLevel,
TLSCertPath: defaultTLSCertPath,
TLSKeyPath: defaultTLSKeyPath,
LogDir: defaultLogDir,
MaxLogFiles: defaultMaxLogFiles,
MaxLogFileSize: defaultMaxLogFileSize,
AcceptorTimeout: defaultAcceptorTimeout,
Bitcoin: &lncfg.Chain{
MinHTLCIn: defaultBitcoinMinHTLCInMSat,
MinHTLCOut: defaultBitcoinMinHTLCOutMSat,
BaseFee: DefaultBitcoinBaseFeeMSat,
FeeRate: DefaultBitcoinFeeRate,
TimeLockDelta: DefaultBitcoinTimeLockDelta,
Node: "btcd",
},
BtcdMode: &lncfg.Btcd{
Dir: defaultBtcdDir,
RPCHost: defaultRPCHost,
RPCCert: defaultBtcdRPCCertFile,
},
BitcoindMode: &lncfg.Bitcoind{
Dir: defaultBitcoindDir,
RPCHost: defaultRPCHost,
EstimateMode: defaultBitcoindEstimateMode,
},
Litecoin: &lncfg.Chain{
MinHTLCIn: defaultLitecoinMinHTLCInMSat,
MinHTLCOut: defaultLitecoinMinHTLCOutMSat,
BaseFee: defaultLitecoinBaseFeeMSat,
FeeRate: defaultLitecoinFeeRate,
TimeLockDelta: defaultLitecoinTimeLockDelta,
Node: "ltcd",
},
LtcdMode: &lncfg.Btcd{
Dir: defaultLtcdDir,
RPCHost: defaultRPCHost,
RPCCert: defaultLtcdRPCCertFile,
},
LitecoindMode: &lncfg.Bitcoind{
Dir: defaultLitecoindDir,
RPCHost: defaultRPCHost,
EstimateMode: defaultBitcoindEstimateMode,
},
UnsafeDisconnect: true,
MaxPendingChannels: lncfg.DefaultMaxPendingChannels,
NoSeedBackup: defaultNoSeedBackup,
MinBackoff: defaultMinBackoff,
MaxBackoff: defaultMaxBackoff,
SubRPCServers: &subRPCServerConfigs{
SignRPC: &signrpc.Config{},
RouterRPC: routerrpc.DefaultConfig(),
},
Autopilot: &lncfg.AutoPilot{
MaxChannels: 5,
Allocation: 0.6,
MinChannelSize: int64(minChanFundingSize),
MaxChannelSize: int64(MaxFundingAmount),
MinConfs: 1,
ConfTarget: autopilot.DefaultConfTarget,
Heuristic: map[string]float64{
"preferential": 1.0,
},
},
PaymentsExpirationGracePeriod: defaultPaymentsExpirationGracePeriod,
TrickleDelay: defaultTrickleDelay,
ChanStatusSampleInterval: defaultChanStatusSampleInterval,
ChanEnableTimeout: defaultChanEnableTimeout,
ChanDisableTimeout: defaultChanDisableTimeout,
Alias: defaultAlias,
Color: defaultColor,
MinChanSize: int64(minChanFundingSize),
NumGraphSyncPeers: defaultMinPeers,
HistoricalSyncInterval: discovery.DefaultHistoricalSyncInterval,
Tor: &lncfg.Tor{
SOCKS: defaultTorSOCKS,
DNS: defaultTorDNS,
Control: defaultTorControl,
},
net: &tor.ClearNet{},
Workers: &lncfg.Workers{
Read: lncfg.DefaultReadWorkers,
Write: lncfg.DefaultWriteWorkers,
Sig: lncfg.DefaultSigWorkers,
},
Caches: &lncfg.Caches{
RejectCacheSize: channeldb.DefaultRejectCacheSize,
ChannelCacheSize: channeldb.DefaultChannelCacheSize,
},
Prometheus: lncfg.DefaultPrometheus(),
Watchtower: &lncfg.Watchtower{
TowerDir: defaultTowerDir,
},
MaxOutgoingCltvExpiry: htlcswitch.DefaultMaxOutgoingCltvExpiry,
MaxChannelFeeAllocation: htlcswitch.DefaultMaxLinkFeeAllocation,
DB: lncfg.DefaultDB(),
registeredChains: newChainRegistry(),
zkMode: defaultZkMode,
selfDelay: lncfg.SelfDelay,
minFee: lncfg.MinFee,
maxFee: lncfg.MaxFee,
valCpfp: lncfg.ValCpfp,
balMinCust: lncfg.BalMinCust,
balMinMerch: lncfg.BalMinMerch,
}
}
// LoadConfig initializes and parses the config using a config file and command
// line options.
//
// The configuration proceeds as follows:
// 1) Start with a default config with sane settings
// 2) Pre-parse the command line to check for an alternative config file
// 3) Load configuration file overwriting defaults with any specified options
// 4) Parse CLI options and overwrite/add any specified options
func LoadConfig() (*Config, error) {
// Pre-parse the command line options to pick up an alternative config
// file.
preCfg := DefaultConfig()
if _, err := flags.Parse(&preCfg); err != nil {
return nil, err
}
// Show the version and exit if the version flag was specified.
appName := filepath.Base(os.Args[0])
appName = strings.TrimSuffix(appName, filepath.Ext(appName))
usageMessage := fmt.Sprintf("Use %s -h to show usage", appName)
if preCfg.ShowVersion {
fmt.Println(appName, "version", build.Version(),
"commit="+build.Commit)
os.Exit(0)
}
// If the config file path has not been modified by the user, then we'll
// use the default config file path. However, if the user has modified
// their lnddir, then we should assume they intend to use the config
// file within it.
configFileDir := CleanAndExpandPath(preCfg.LndDir)
configFilePath := CleanAndExpandPath(preCfg.ConfigFile)
if configFileDir != DefaultLndDir {
if configFilePath == DefaultConfigFile {
configFilePath = filepath.Join(
configFileDir, lncfg.DefaultConfigFilename,
)
}
}
// Next, load any additional configuration options from the file.
var configFileError error
cfg := preCfg
if err := flags.IniParse(configFilePath, &cfg); err != nil {
// If it's a parsing related error, then we'll return
// immediately, otherwise we can proceed as possibly the config
// file doesn't exist which is OK.
if _, ok := err.(*flags.IniError); ok {
return nil, err
}
configFileError = err
}
// Finally, parse the remaining command line options again to ensure
// they take precedence.
if _, err := flags.Parse(&cfg); err != nil {
return nil, err
}
// Make sure everything we just loaded makes sense.
cleanCfg, err := ValidateConfig(cfg, usageMessage)
if err != nil {
return nil, err
}
// Warn about missing config file only after all other configuration is
// done. This prevents the warning on help messages and invalid
// options. Note this should go directly before the return.
if configFileError != nil {
ltndLog.Warnf("%v", configFileError)
}
return cleanCfg, nil
}
// ValidateConfig check the given configuration to be sane. This makes sure no
// illegal values or combination of values are set. All file system paths are
// normalized. The cleaned up config is returned on success.
func ValidateConfig(cfg Config, usageMessage string) (*Config, error) {
// If the provided lnd directory is not the default, we'll modify the
// path to all of the files and directories that will live within it.
lndDir := CleanAndExpandPath(cfg.LndDir)
if lndDir != DefaultLndDir {
cfg.DataDir = filepath.Join(lndDir, defaultDataDirname)
cfg.TLSCertPath = filepath.Join(lndDir, defaultTLSCertFilename)
cfg.TLSKeyPath = filepath.Join(lndDir, defaultTLSKeyFilename)
cfg.LogDir = filepath.Join(lndDir, defaultLogDirname)
// If the watchtower's directory is set to the default, i.e. the
// user has not requested a different location, we'll move the
// location to be relative to the specified lnd directory.
if cfg.Watchtower.TowerDir == defaultTowerDir {
cfg.Watchtower.TowerDir =
filepath.Join(cfg.DataDir, defaultTowerSubDirname)
}
}
// Create the lnd directory if it doesn't already exist.
funcName := "loadConfig"
if err := os.MkdirAll(lndDir, 0700); err != nil {
// Show a nicer error message if it's because a symlink is
// linked to a directory that does not exist (probably because
// it's not mounted).
if e, ok := err.(*os.PathError); ok && os.IsExist(err) {
if link, lerr := os.Readlink(e.Path); lerr == nil {
str := "is symlink %s -> %s mounted?"
err = fmt.Errorf(str, e.Path, link)
}
}
str := "%s: Failed to create lnd directory: %v"
err := fmt.Errorf(str, funcName, err)
_, _ = fmt.Fprintln(os.Stderr, err)
return nil, err
}
// As soon as we're done parsing configuration options, ensure all paths
// to directories and files are cleaned and expanded before attempting
// to use them later on.
cfg.DataDir = CleanAndExpandPath(cfg.DataDir)
cfg.TLSCertPath = CleanAndExpandPath(cfg.TLSCertPath)
cfg.TLSKeyPath = CleanAndExpandPath(cfg.TLSKeyPath)
cfg.AdminMacPath = CleanAndExpandPath(cfg.AdminMacPath)
cfg.ReadMacPath = CleanAndExpandPath(cfg.ReadMacPath)
cfg.InvoiceMacPath = CleanAndExpandPath(cfg.InvoiceMacPath)
cfg.LogDir = CleanAndExpandPath(cfg.LogDir)
cfg.BtcdMode.Dir = CleanAndExpandPath(cfg.BtcdMode.Dir)
cfg.LtcdMode.Dir = CleanAndExpandPath(cfg.LtcdMode.Dir)
cfg.BitcoindMode.Dir = CleanAndExpandPath(cfg.BitcoindMode.Dir)
cfg.LitecoindMode.Dir = CleanAndExpandPath(cfg.LitecoindMode.Dir)
cfg.Tor.PrivateKeyPath = CleanAndExpandPath(cfg.Tor.PrivateKeyPath)
cfg.Tor.WatchtowerKeyPath = CleanAndExpandPath(cfg.Tor.WatchtowerKeyPath)
cfg.Watchtower.TowerDir = CleanAndExpandPath(cfg.Watchtower.TowerDir)
// Ensure that the user didn't attempt to specify negative values for
// any of the autopilot params.
if cfg.Autopilot.MaxChannels < 0 {
str := "%s: autopilot.maxchannels must be non-negative"
err := fmt.Errorf(str, funcName)
_, _ = fmt.Fprintln(os.Stderr, err)
return nil, err
}
if cfg.Autopilot.Allocation < 0 {
str := "%s: autopilot.allocation must be non-negative"
err := fmt.Errorf(str, funcName)
_, _ = fmt.Fprintln(os.Stderr, err)
return nil, err
}
if cfg.Autopilot.MinChannelSize < 0 {
str := "%s: autopilot.minchansize must be non-negative"
err := fmt.Errorf(str, funcName)
_, _ = fmt.Fprintln(os.Stderr, err)
return nil, err
}
if cfg.Autopilot.MaxChannelSize < 0 {
str := "%s: autopilot.maxchansize must be non-negative"
err := fmt.Errorf(str, funcName)
_, _ = fmt.Fprintln(os.Stderr, err)
return nil, err
}
if cfg.Autopilot.MinConfs < 0 {
str := "%s: autopilot.minconfs must be non-negative"
err := fmt.Errorf(str, funcName)
_, _ = fmt.Fprintln(os.Stderr, err)
return nil, err
}
if cfg.Autopilot.ConfTarget < 1 {
str := "%s: autopilot.conftarget must be positive"
err := fmt.Errorf(str, funcName)
_, _ = fmt.Fprintln(os.Stderr, err)
return nil, err
}
// Ensure that the specified values for the min and max channel size
// don't are within the bounds of the normal chan size constraints.
if cfg.Autopilot.MinChannelSize < int64(minChanFundingSize) {
cfg.Autopilot.MinChannelSize = int64(minChanFundingSize)
}
if cfg.Autopilot.MaxChannelSize > int64(MaxFundingAmount) {
cfg.Autopilot.MaxChannelSize = int64(MaxFundingAmount)
}
if _, err := validateAtplCfg(cfg.Autopilot); err != nil {
return nil, err
}
// Ensure a valid max channel fee allocation was set.
if cfg.MaxChannelFeeAllocation <= 0 || cfg.MaxChannelFeeAllocation > 1 {
return nil, fmt.Errorf("invalid max channel fee allocation: "+
"%v, must be within (0, 1]",
cfg.MaxChannelFeeAllocation)
}
// Validate the Tor config parameters.
socks, err := lncfg.ParseAddressString(
cfg.Tor.SOCKS, strconv.Itoa(defaultTorSOCKSPort),
cfg.net.ResolveTCPAddr,
)
if err != nil {
return nil, err
}
cfg.Tor.SOCKS = socks.String()
// We'll only attempt to normalize and resolve the DNS host if it hasn't
// changed, as it doesn't need to be done for the default.
if cfg.Tor.DNS != defaultTorDNS {
dns, err := lncfg.ParseAddressString(
cfg.Tor.DNS, strconv.Itoa(defaultTorDNSPort),
cfg.net.ResolveTCPAddr,
)
if err != nil {
return nil, err
}
cfg.Tor.DNS = dns.String()
}
control, err := lncfg.ParseAddressString(
cfg.Tor.Control, strconv.Itoa(defaultTorControlPort),
cfg.net.ResolveTCPAddr,
)
if err != nil {
return nil, err
}
cfg.Tor.Control = control.String()
// Ensure that tor socks host:port is not equal to tor control
// host:port. This would lead to lnd not starting up properly.
if cfg.Tor.SOCKS == cfg.Tor.Control {
str := "%s: tor.socks and tor.control can not use " +
"the same host:port"
return nil, fmt.Errorf(str, funcName)
}
switch {
case cfg.Tor.V2 && cfg.Tor.V3:
return nil, errors.New("either tor.v2 or tor.v3 can be set, " +
"but not both")
case cfg.DisableListen && (cfg.Tor.V2 || cfg.Tor.V3):
return nil, errors.New("listening must be enabled when " +
"enabling inbound connections over Tor")
}
if cfg.Tor.PrivateKeyPath == "" {
switch {
case cfg.Tor.V2:
cfg.Tor.PrivateKeyPath = filepath.Join(
lndDir, defaultTorV2PrivateKeyFilename,
)
case cfg.Tor.V3:
cfg.Tor.PrivateKeyPath = filepath.Join(
lndDir, defaultTorV3PrivateKeyFilename,
)
}
}
if cfg.Tor.WatchtowerKeyPath == "" {
switch {
case cfg.Tor.V2:
cfg.Tor.WatchtowerKeyPath = filepath.Join(
cfg.Watchtower.TowerDir, defaultTorV2PrivateKeyFilename,
)
case cfg.Tor.V3:
cfg.Tor.WatchtowerKeyPath = filepath.Join(
cfg.Watchtower.TowerDir, defaultTorV3PrivateKeyFilename,
)
}
}
// Set up the network-related functions that will be used throughout
// the daemon. We use the standard Go "net" package functions by
// default. If we should be proxying all traffic through Tor, then
// we'll use the Tor proxy specific functions in order to avoid leaking
// our real information.
if cfg.Tor.Active {
cfg.net = &tor.ProxyNet{
SOCKS: cfg.Tor.SOCKS,
DNS: cfg.Tor.DNS,
StreamIsolation: cfg.Tor.StreamIsolation,
}
}
if cfg.DisableListen && cfg.NAT {
return nil, errors.New("NAT traversal cannot be used when " +
"listening is disabled")
}
// Determine the active chain configuration and its parameters.
switch {
// At this moment, multiple active chains are not supported.
case cfg.Litecoin.Active && cfg.Bitcoin.Active:
str := "%s: Currently both Bitcoin and Litecoin cannot be " +
"active together"
return nil, fmt.Errorf(str, funcName)
// Either Bitcoin must be active, or Litecoin must be active.
// Otherwise, we don't know which chain we're on.
case !cfg.Bitcoin.Active && !cfg.Litecoin.Active:
return nil, fmt.Errorf("%s: either bitcoin.active or "+
"litecoin.active must be set to 1 (true)", funcName)
case cfg.Litecoin.Active:
if cfg.Litecoin.TimeLockDelta < minTimeLockDelta {
return nil, fmt.Errorf("timelockdelta must be at least %v",
minTimeLockDelta)
}
// Multiple networks can't be selected simultaneously. Count
// number of network flags passed; assign active network params
// while we're at it.
numNets := 0
var ltcParams litecoinNetParams
if cfg.Litecoin.MainNet {
numNets++
ltcParams = litecoinMainNetParams
}
if cfg.Litecoin.TestNet3 {
numNets++
ltcParams = litecoinTestNetParams
}
if cfg.Litecoin.RegTest {
numNets++
ltcParams = litecoinRegTestNetParams
}
if cfg.Litecoin.SimNet {
numNets++
ltcParams = litecoinSimNetParams
}
if numNets > 1 {
str := "%s: The mainnet, testnet, and simnet params " +
"can't be used together -- choose one of the " +
"three"
err := fmt.Errorf(str, funcName)
return nil, err
}
// The target network must be provided, otherwise, we won't
// know how to initialize the daemon.
if numNets == 0 {
str := "%s: either --litecoin.mainnet, or " +
"litecoin.testnet must be specified"
err := fmt.Errorf(str, funcName)
return nil, err
}
// The litecoin chain is the current active chain. However
// throughout the codebase we required chaincfg.Params. So as a
// temporary hack, we'll mutate the default net params for
// bitcoin with the litecoin specific information.
applyLitecoinParams(&activeNetParams, <cParams)
switch cfg.Litecoin.Node {
case "ltcd":
err := parseRPCParams(cfg.Litecoin, cfg.LtcdMode,
litecoinChain, funcName)
if err != nil {
err := fmt.Errorf("unable to load RPC "+
"credentials for ltcd: %v", err)
return nil, err
}
case "litecoind":
if cfg.Litecoin.SimNet {
return nil, fmt.Errorf("%s: litecoind does not "+
"support simnet", funcName)
}
err := parseRPCParams(cfg.Litecoin, cfg.LitecoindMode,
litecoinChain, funcName)
if err != nil {
err := fmt.Errorf("unable to load RPC "+
"credentials for litecoind: %v", err)
return nil, err
}
default:
str := "%s: only ltcd and litecoind mode supported for " +
"litecoin at this time"
return nil, fmt.Errorf(str, funcName)
}
cfg.Litecoin.ChainDir = filepath.Join(cfg.DataDir,
defaultChainSubDirname,
litecoinChain.String())
// Finally we'll register the litecoin chain as our current
// primary chain.
cfg.registeredChains.RegisterPrimaryChain(litecoinChain)
MaxFundingAmount = maxLtcFundingAmount
MaxPaymentMSat = maxLtcPaymentMSat
case cfg.Bitcoin.Active:
// Multiple networks can't be selected simultaneously. Count
// number of network flags passed; assign active network params
// while we're at it.
numNets := 0
if cfg.Bitcoin.MainNet {
numNets++
activeNetParams = bitcoinMainNetParams
}
if cfg.Bitcoin.TestNet3 {
numNets++
activeNetParams = bitcoinTestNetParams
}
if cfg.Bitcoin.RegTest {
numNets++
activeNetParams = bitcoinRegTestNetParams
}
if cfg.Bitcoin.SimNet {
numNets++
activeNetParams = bitcoinSimNetParams
}
if numNets > 1 {
str := "%s: The mainnet, testnet, regtest, and " +
"simnet params can't be used together -- " +
"choose one of the four"
err := fmt.Errorf(str, funcName)
return nil, err
}
// The target network must be provided, otherwise, we won't
// know how to initialize the daemon.
if numNets == 0 {
str := "%s: either --bitcoin.mainnet, or " +
"bitcoin.testnet, bitcoin.simnet, or bitcoin.regtest " +
"must be specified"
err := fmt.Errorf(str, funcName)
return nil, err
}
if cfg.Bitcoin.TimeLockDelta < minTimeLockDelta {
return nil, fmt.Errorf("timelockdelta must be at least %v",
minTimeLockDelta)
}
switch cfg.Bitcoin.Node {
case "btcd":
err := parseRPCParams(
cfg.Bitcoin, cfg.BtcdMode, bitcoinChain, funcName,
)
if err != nil {
err := fmt.Errorf("unable to load RPC "+
"credentials for btcd: %v", err)
return nil, err
}
case "bitcoind":
if cfg.Bitcoin.SimNet {
return nil, fmt.Errorf("%s: bitcoind does not "+
"support simnet", funcName)
}
err := parseRPCParams(
cfg.Bitcoin, cfg.BitcoindMode, bitcoinChain, funcName,
)
if err != nil {
err := fmt.Errorf("unable to load RPC "+
"credentials for bitcoind: %v", err)
return nil, err
}
case "neutrino":
// No need to get RPC parameters.
default:
str := "%s: only btcd, bitcoind, and neutrino mode " +
"supported for bitcoin at this time"
return nil, fmt.Errorf(str, funcName)
}
cfg.Bitcoin.ChainDir = filepath.Join(cfg.DataDir,
defaultChainSubDirname,
bitcoinChain.String())
// Finally we'll register the bitcoin chain as our current
// primary chain.
cfg.registeredChains.RegisterPrimaryChain(bitcoinChain)
}
// Ensure that the user didn't attempt to specify negative values for
// any of the autopilot params.
if cfg.Autopilot.MaxChannels < 0 {
str := "%s: autopilot.maxchannels must be non-negative"
err := fmt.Errorf(str, funcName)
_, _ = fmt.Fprintln(os.Stderr, err)
return nil, err
}
if cfg.Autopilot.Allocation < 0 {
str := "%s: autopilot.allocation must be non-negative"
err := fmt.Errorf(str, funcName)
_, _ = fmt.Fprintln(os.Stderr, err)
return nil, err
}
if cfg.Autopilot.MinChannelSize < 0 {
str := "%s: autopilot.minchansize must be non-negative"
err := fmt.Errorf(str, funcName)
_, _ = fmt.Fprintln(os.Stderr, err)
return nil, err
}
if cfg.Autopilot.MaxChannelSize < 0 {
str := "%s: autopilot.maxchansize must be non-negative"
err := fmt.Errorf(str, funcName)
_, _ = fmt.Fprintln(os.Stderr, err)
return nil, err
}
// Ensure that the specified values for the min and max channel size
// don't are within the bounds of the normal chan size constraints.
if cfg.Autopilot.MinChannelSize < int64(minChanFundingSize) {
cfg.Autopilot.MinChannelSize = int64(minChanFundingSize)
}
if cfg.Autopilot.MaxChannelSize > int64(MaxFundingAmount) {
cfg.Autopilot.MaxChannelSize = int64(MaxFundingAmount)
}
// Validate profile port number.
if cfg.Profile != "" {
profilePort, err := strconv.Atoi(cfg.Profile)
if err != nil || profilePort < 1024 || profilePort > 65535 {
str := "%s: The profile port must be between 1024 and 65535"
err := fmt.Errorf(str, funcName)
_, _ = fmt.Fprintln(os.Stderr, err)
_, _ = fmt.Fprintln(os.Stderr, usageMessage)
return nil, err
}
}
// We'll now construct the network directory which will be where we
// store all the data specific to this chain/network.
cfg.networkDir = filepath.Join(
cfg.DataDir, defaultChainSubDirname,
cfg.registeredChains.PrimaryChain().String(),
normalizeNetwork(activeNetParams.Name),
)
// If a custom macaroon directory wasn't specified and the data
// directory has changed from the default path, then we'll also update
// the path for the macaroons to be generated.
if cfg.AdminMacPath == "" {
cfg.AdminMacPath = filepath.Join(
cfg.networkDir, defaultAdminMacFilename,
)
}
if cfg.ReadMacPath == "" {
cfg.ReadMacPath = filepath.Join(
cfg.networkDir, defaultReadMacFilename,
)
}
if cfg.InvoiceMacPath == "" {
cfg.InvoiceMacPath = filepath.Join(
cfg.networkDir, defaultInvoiceMacFilename,
)
}
// Similarly, if a custom back up file path wasn't specified, then
// we'll update the file location to match our set network directory.
if cfg.BackupFilePath == "" {
cfg.BackupFilePath = filepath.Join(
cfg.networkDir, chanbackup.DefaultBackupFileName,
)
}
// Append the network type to the log directory so it is "namespaced"
// per network in the same fashion as the data directory.
cfg.LogDir = filepath.Join(cfg.LogDir,
cfg.registeredChains.PrimaryChain().String(),
normalizeNetwork(activeNetParams.Name))
// Special show command to list supported subsystems and exit.
if cfg.DebugLevel == "show" {
fmt.Println("Supported subsystems",
RootLogWriter.SupportedSubsystems())
os.Exit(0)
}
// Initialize logging at the default logging level.
err = RootLogWriter.InitLogRotator(
filepath.Join(cfg.LogDir, defaultLogFilename),
cfg.MaxLogFileSize, cfg.MaxLogFiles,
)
if err != nil {
str := "%s: log rotation setup failed: %v"
err = fmt.Errorf(str, funcName, err.Error())
_, _ = fmt.Fprintln(os.Stderr, err)
return nil, err
}
// Parse, validate, and set debug log level(s).
err = build.ParseAndSetDebugLevels(cfg.DebugLevel, RootLogWriter)
if err != nil {
err = fmt.Errorf("%s: %v", funcName, err.Error())
_, _ = fmt.Fprintln(os.Stderr, err)
_, _ = fmt.Fprintln(os.Stderr, usageMessage)
return nil, err
}
// At least one RPCListener is required. So listen on localhost per
// default.
if len(cfg.RawRPCListeners) == 0 {
addr := fmt.Sprintf("localhost:%d", defaultRPCPort)
cfg.RawRPCListeners = append(cfg.RawRPCListeners, addr)
}
// Listen on localhost if no REST listeners were specified.
if len(cfg.RawRESTListeners) == 0 {
addr := fmt.Sprintf("localhost:%d", defaultRESTPort)
cfg.RawRESTListeners = append(cfg.RawRESTListeners, addr)
}