lnd.xprv/config.go

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2015-12-26 09:09:17 +03:00
package main
import (
"fmt"
"io/ioutil"
"net"
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"os"
"path/filepath"
"regexp"
"sort"
"strconv"
"strings"
"time"
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flags "github.com/btcsuite/go-flags"
"github.com/lightningnetwork/lnd/brontide"
"github.com/lightningnetwork/lnd/lnwire"
"github.com/roasbeef/btcd/btcec"
"github.com/roasbeef/btcutil"
)
const (
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defaultConfigFilename = "lnd.conf"
defaultDataDirname = "data"
defaultLogLevel = "info"
defaultLogDirname = "logs"
defaultLogFilename = "lnd.log"
defaultRPCPort = 10009
defaultPeerPort = 5656
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defaultRPCHost = "localhost"
defaultMaxPendingChannels = 1
)
var (
lndHomeDir = btcutil.AppDataDir("lnd", false)
defaultConfigFile = filepath.Join(lndHomeDir, defaultConfigFilename)
defaultDataDir = filepath.Join(lndHomeDir, defaultDataDirname)
defaultLogDir = filepath.Join(lndHomeDir, defaultLogDirname)
btcdHomeDir = btcutil.AppDataDir("btcd", false)
defaultBtcdRPCCertFile = filepath.Join(btcdHomeDir, "rpc.cert")
ltcdHomeDir = btcutil.AppDataDir("ltcd", false)
defaultLtcdRPCCertFile = filepath.Join(ltcdHomeDir, "rpc.cert")
)
type chainConfig struct {
Active bool `long:"active" destination:"If the chain should be active or not."`
ChainDir string `long:"chaindir" description:"The directory to store the chains's data within."`
RPCHost string `long:"rpchost" description:"The daemon's rpc listening address. If a port is omitted, then the default port for the selected chain parameters will be used."`
RPCUser string `long:"rpcuser" description:"Username for RPC connections"`
RPCPass string `long:"rpcpass" default-mask:"-" description:"Password for RPC connections"`
RPCCert string `long:"rpccert" description:"File containing the daemon's certificate file"`
RawRPCCert string `long:"rawrpccert" description:"The raw bytes of the daemon's PEM-encoded certificate chain which will be used to authenticate the RPC connection."`
TestNet3 bool `long:"testnet" description:"Use the test network"`
SimNet bool `long:"simnet" description:"Use the simulation test network"`
}
type spvConfig struct {
Active bool `long:"active" destination:"If SPV mode should be active or not."`
AddPeers []string `short:"a" long:"addpeer" description:"Add a peer to connect with at startup"`
ConnectPeers []string `long:"connect" description:"Connect only to the specified peers at startup"`
MaxPeers int `long:"maxpeers" description:"Max number of inbound and outbound peers"`
BanDuration time.Duration `long:"banduration" description:"How long to ban misbehaving peers. Valid time units are {s, m, h}. Minimum 1 second"`
BanThreshold uint32 `long:"banthreshold" description:"Maximum allowed ban score before disconnecting and banning misbehaving peers."`
}
// 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"`
ConfigFile string `long:"C" long:"configfile" description:"Path to configuration file"`
DataDir string `short:"b" long:"datadir" description:"The directory to store lnd's data within"`
LogDir string `long:"logdir" description:"Directory to log output."`
Listeners []string `long:"listen" description:"Add an interface/port to listen for connections (default all interfaces port: 5656)"`
ExternalIPs []string `long:"externalip" description:"Add an ip to the list of local addresses we claim to listen on to peers"`
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"`
Profile string `long:"profile" description:"Enable HTTP profiling on given port -- NOTE port must be between 1024 and 65536"`
PeerPort int `long:"peerport" description:"The port to listen on for incoming p2p connections"`
RPCPort int `long:"rpcport" description:"The port for the rpc server"`
DebugHTLC bool `long:"debughtlc" description:"Activate the debug htlc mode. With the debug HTLC mode, all payments sent use a pre-determined R-Hash. Additionally, all HTLCs sent to a node with the debug HTLC R-Hash are immediately settled in the next available state transition."`
MaxPendingChannels int `long:"maxpendingchannels" description:"The maximum number of incoming pending channels permitted per peer."`
Litecoin *chainConfig `group:"Litecoin" namespace:"litecoin"`
Bitcoin *chainConfig `group:"Bitcoin" namespace:"bitcoin"`
SpvMode *spvConfig `group:"SPV" namespace:"spv"`
}
// 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) {
defaultCfg := config{
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ConfigFile: defaultConfigFile,
DataDir: defaultDataDir,
DebugLevel: defaultLogLevel,
LogDir: defaultLogDir,
PeerPort: defaultPeerPort,
RPCPort: defaultRPCPort,
MaxPendingChannels: defaultMaxPendingChannels,
Bitcoin: &chainConfig{
RPCHost: defaultRPCHost,
RPCCert: defaultBtcdRPCCertFile,
},
Litecoin: &chainConfig{
RPCHost: defaultRPCHost,
RPCCert: defaultLtcdRPCCertFile,
},
}
// Pre-parse the command line options to pick up an alternative config
// file.
preCfg := defaultCfg
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", version())
os.Exit(0)
}
// Create the home directory if it doesn't already exist.
funcName := "loadConfig"
if err := os.MkdirAll(lndHomeDir, 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 home directory: %v"
err := fmt.Errorf(str, funcName, err)
fmt.Fprintln(os.Stderr, err)
return nil, err
}
// Next, load any additional configuration options from the file.
cfg := defaultCfg
if err := flags.IniParse(preCfg.ConfigFile, &cfg); err != nil {
fmt.Fprintln(os.Stderr, err)
}
// Finally, parse the remaining command line options again to ensure
// they take precedence.
if _, err := flags.Parse(&cfg); err != nil {
return nil, err
}
// At this moment, multiple active chains are not supported.
if cfg.Litecoin.Active && cfg.Bitcoin.Active {
str := "%s: Currently both Bitcoin and Litecoin cannot be " +
"active together"
err := fmt.Errorf(str, funcName)
return nil, err
}
// The SPV mode implemented currently doesn't support Litecoin, so the
// two modes are incompatible.
if cfg.SpvMode.Active && cfg.Litecoin.Active {
str := "%s: The light client mode currently supported does " +
"not yet support execution on the Litecoin network"
err := fmt.Errorf(str, funcName)
return nil, err
}
if cfg.Litecoin.Active {
if cfg.Litecoin.SimNet {
str := "%s: simnet mode for litecoin not currently supported"
return nil, fmt.Errorf(str, funcName)
}
// The litecoin chain is the current active chain. However
// throuhgout the codebase we required chiancfg.Params. So as a
// temporary hack, we'll mutate the default net params for
// bitcoin with the litecoin specific informat.ion
paramCopy := bitcoinTestNetParams
applyLitecoinParams(&paramCopy)
activeNetParams = paramCopy
if !cfg.SpvMode.Active {
// Attempt to parse out the RPC credentials for the
// litecoin chain if the information wasn't specified
err := parseRPCParams(cfg.Litecoin, litecoinChain, funcName)
if err != nil {
err := fmt.Errorf("unable to load RPC credentials for "+
"ltcd: %v", err)
return nil, err
}
}
cfg.Litecoin.ChainDir = filepath.Join(cfg.DataDir, litecoinChain.String())
// Finally we'll register the litecoin chain as our current
// primary chain.
registeredChains.RegisterPrimaryChain(litecoinChain)
}
if 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.TestNet3 {
numNets++
activeNetParams = bitcoinTestNetParams
}
if cfg.Bitcoin.SimNet {
activeNetParams = bitcoinSimNetParams
}
if numNets > 1 {
str := "%s: The testnet, segnet, and simnet params can't be " +
"used together -- choose one of the three"
err := fmt.Errorf(str, funcName)
return nil, err
}
if !cfg.SpvMode.Active {
// If needed, we'll attempt to automatically configure
// the RPC control plan for the target btcd node.
err := parseRPCParams(cfg.Bitcoin, bitcoinChain, funcName)
if err != nil {
err := fmt.Errorf("unable to load RPC credentials for "+
"btcd: %v", err)
return nil, err
}
}
cfg.Bitcoin.ChainDir = filepath.Join(cfg.DataDir, bitcoinChain.String())
// Finally we'll register the bitcoin chain as our current
// primary chain.
registeredChains.RegisterPrimaryChain(bitcoinChain)
}
// 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
}
}
// Append the network type to the data directory so it is "namespaced"
// per network. In addition to the block database, there are other
// pieces of data that are saved to disk such as address manager state.
// All data is specific to a network, so namespacing the data directory
// means each individual piece of serialized data does not have to
// worry about changing names per network and such.
// TODO(roasbeef): when we go full multi-chain remove the additional
// namespacing on the target chain.
cfg.DataDir = cleanAndExpandPath(cfg.DataDir)
cfg.DataDir = filepath.Join(cfg.DataDir, activeNetParams.Name)
cfg.DataDir = filepath.Join(cfg.DataDir,
registeredChains.primaryChain.String())
// Append the network type to the log directory so it is "namespaced"
// per network in the same fashion as the data directory.
cfg.LogDir = cleanAndExpandPath(cfg.LogDir)
cfg.LogDir = filepath.Join(cfg.LogDir, activeNetParams.Name)
cfg.LogDir = filepath.Join(cfg.LogDir,
registeredChains.primaryChain.String())
// Initialize logging at the default logging level.
initSeelogLogger(filepath.Join(cfg.LogDir, defaultLogFilename))
setLogLevels(defaultLogLevel)
// Parse, validate, and set debug log level(s).
if err := parseAndSetDebugLevels(cfg.DebugLevel); err != nil {
err := fmt.Errorf("%s: %v", funcName, err.Error())
fmt.Fprintln(os.Stderr, err)
fmt.Fprintln(os.Stderr, usageMessage)
return nil, err
}
return &cfg, nil
}
// cleanAndExpandPath expands environment variables and leading ~ in the
// passed path, cleans the result, and returns it.
func cleanAndExpandPath(path string) string {
// Expand initial ~ to OS specific home directory.
if strings.HasPrefix(path, "~") {
homeDir := filepath.Dir(lndHomeDir)
path = strings.Replace(path, "~", homeDir, 1)
}
// NOTE: The os.ExpandEnv doesn't work with Windows-style %VARIABLE%,
// but the variables can still be expanded via POSIX-style $VARIABLE.
return filepath.Clean(os.ExpandEnv(path))
}
// parseAndSetDebugLevels attempts to parse the specified debug level and set
// the levels accordingly. An appropriate error is returned if anything is
// invalid.
func parseAndSetDebugLevels(debugLevel string) error {
// When the specified string doesn't have any delimters, treat it as
// the log level for all subsystems.
if !strings.Contains(debugLevel, ",") && !strings.Contains(debugLevel, "=") {
// Validate debug log level.
if !validLogLevel(debugLevel) {
str := "The specified debug level [%v] is invalid"
return fmt.Errorf(str, debugLevel)
}
// Change the logging level for all subsystems.
setLogLevels(debugLevel)
return nil
}
// Split the specified string into subsystem/level pairs while detecting
// issues and update the log levels accordingly.
for _, logLevelPair := range strings.Split(debugLevel, ",") {
if !strings.Contains(logLevelPair, "=") {
str := "The specified debug level contains an invalid " +
"subsystem/level pair [%v]"
return fmt.Errorf(str, logLevelPair)
}
// Extract the specified subsystem and log level.
fields := strings.Split(logLevelPair, "=")
subsysID, logLevel := fields[0], fields[1]
// Validate subsystem.
if _, exists := subsystemLoggers[subsysID]; !exists {
str := "The specified subsystem [%v] is invalid -- " +
"supported subsytems %v"
return fmt.Errorf(str, subsysID, supportedSubsystems())
}
// Validate log level.
if !validLogLevel(logLevel) {
str := "The specified debug level [%v] is invalid"
return fmt.Errorf(str, logLevel)
}
setLogLevel(subsysID, logLevel)
}
return nil
}
// validLogLevel returns whether or not logLevel is a valid debug log level.
func validLogLevel(logLevel string) bool {
switch logLevel {
case "trace":
fallthrough
case "debug":
fallthrough
case "info":
fallthrough
case "warn":
fallthrough
case "error":
fallthrough
case "critical":
return true
}
return false
}
// supportedSubsystems returns a sorted slice of the supported subsystems for
// logging purposes.
func supportedSubsystems() []string {
// Convert the subsystemLoggers map keys to a slice.
subsystems := make([]string, 0, len(subsystemLoggers))
for subsysID := range subsystemLoggers {
subsystems = append(subsystems, subsysID)
}
// Sort the subsystems for stable display.
sort.Strings(subsystems)
return subsystems
}
// noiseDial is a factory function which creates a connmgr compliant dialing
// function by returning a closure which includes the server's identity key.
func noiseDial(idPriv *btcec.PrivateKey) func(net.Addr) (net.Conn, error) {
return func(a net.Addr) (net.Conn, error) {
lnAddr := a.(*lnwire.NetAddress)
return brontide.Dial(idPriv, lnAddr)
}
}
func parseRPCParams(cConfig *chainConfig, net chainCode, funcName string) error {
// If the rpcuser and rpcpass paramters aren't set, then we'll attempt
// to automatically obtain the properm mcredentials for btcd and set
// them within the configuration.
if cConfig.RPCUser != "" || cConfig.RPCPass != "" {
return nil
}
// If we're in simnet mode, then the running btcd instance won't read
// the RPC credentials from the configuration. So if lnd wasn't
// specified the paramters, then we won't be able to start.
if cConfig.SimNet {
str := "%v: rpcuser and rpcpass must be set to your btcd " +
"node's RPC paramters"
return fmt.Errorf(str, funcName)
}
daemonName := "btcd"
if net == litecoinChain {
daemonName = "ltcd"
}
fmt.Println("Attempting automatic RPC configuration to " + daemonName)
homeDir := btcdHomeDir
if net == litecoinChain {
homeDir = ltcdHomeDir
}
confFile := filepath.Join(homeDir, fmt.Sprintf("%v.conf", daemonName))
rpcUser, rpcPass, err := extractRPCParams(confFile)
if err != nil {
return fmt.Errorf("unable to extract RPC "+
"credentials: %v, cannot start w/o RPC connection",
err)
}
fmt.Printf("Automatically obtained %v's RPC credentials\n", daemonName)
cConfig.RPCUser, cConfig.RPCPass = rpcUser, rpcPass
return nil
}
// extractRPCParams attempts to extract the RPC credentials for an existing
// btcd instance. The passed path is expected to be the location of btcd's
// application data directory on the target system.
func extractRPCParams(btcdConfigPath string) (string, string, error) {
// First, we'll open up the btcd configuration file found at the target
// destination.
btcdConfigFile, err := os.Open(btcdConfigPath)
if err != nil {
return "", "", err
}
defer btcdConfigFile.Close()
// With the file open extract the contents of the configuration file so
// we can attempt o locate the RPC credentials.
configContents, err := ioutil.ReadAll(btcdConfigFile)
if err != nil {
return "", "", err
}
// Attempt to locate the RPC user using a regular expression. If we
// don't have a match for our regular expression then we'll exit with
// an error.
rpcUserRegexp, err := regexp.Compile(`(?m)^\s*rpcuser=([^\s]+)`)
if err != nil {
return "", "", err
}
userSubmatches := rpcUserRegexp.FindSubmatch(configContents)
if userSubmatches == nil {
return "", "", fmt.Errorf("unable to find rpcuser in config")
}
// Similarly, we'll use another regular expression to find the set
// rpcpass (if any). If we can't find the pass, then we'll exit with an
// error.
rpcPassRegexp, err := regexp.Compile(`(?m)^\s*rpcpass=([^\s]+)`)
if err != nil {
return "", "", err
}
passSubmatches := rpcPassRegexp.FindSubmatch(configContents)
if passSubmatches == nil {
return "", "", fmt.Errorf("unable to find rpcuser in config")
}
return string(userSubmatches[1]), string(passSubmatches[1]), nil
}