lnd.xprv/cmd/lncli/main.go

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// Copyright (c) 2013-2017 The btcsuite developers
// Copyright (c) 2015-2016 The Decred developers
// Copyright (C) 2015-2017 The Lightning Network Developers
package main
import (
"fmt"
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"io/ioutil"
"os"
"os/user"
"path/filepath"
"strings"
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macaroon "gopkg.in/macaroon.v2"
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"github.com/btcsuite/btcutil"
"github.com/lightningnetwork/lnd/build"
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"github.com/lightningnetwork/lnd/lncfg"
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"github.com/lightningnetwork/lnd/lnrpc"
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"github.com/lightningnetwork/lnd/macaroons"
"github.com/urfave/cli"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
)
const (
defaultDataDir = "data"
defaultChainSubDir = "chain"
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defaultTLSCertFilename = "tls.cert"
defaultMacaroonFilename = "admin.macaroon"
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defaultRPCPort = "10009"
defaultRPCHostPort = "localhost:" + defaultRPCPort
)
var (
defaultLndDir = btcutil.AppDataDir("lnd", false)
defaultTLSCertPath = filepath.Join(defaultLndDir, defaultTLSCertFilename)
// maxMsgRecvSize is the largest message our client will receive. We
// set this to ~50Mb atm.
maxMsgRecvSize = grpc.MaxCallRecvMsgSize(1 * 1024 * 1024 * 50)
)
func fatal(err error) {
fmt.Fprintf(os.Stderr, "[lncli] %v\n", err)
os.Exit(1)
}
func getWalletUnlockerClient(ctx *cli.Context) (lnrpc.WalletUnlockerClient, func()) {
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conn := getClientConn(ctx, true)
cleanUp := func() {
conn.Close()
}
return lnrpc.NewWalletUnlockerClient(conn), cleanUp
}
func getClient(ctx *cli.Context) (lnrpc.LightningClient, func()) {
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conn := getClientConn(ctx, false)
cleanUp := func() {
conn.Close()
}
return lnrpc.NewLightningClient(conn), cleanUp
}
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func getClientConn(ctx *cli.Context, skipMacaroons bool) *grpc.ClientConn {
// First, we'll parse the args from the command.
tlsCertPath, macPath, err := extractPathArgs(ctx)
if err != nil {
fatal(err)
}
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// Load the specified TLS certificate and build transport credentials
// with it.
creds, err := credentials.NewClientTLSFromFile(tlsCertPath, "")
if err != nil {
fatal(err)
}
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// Create a dial options array.
opts := []grpc.DialOption{
grpc.WithTransportCredentials(creds),
}
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// Only process macaroon credentials if --no-macaroons isn't set and
// if we're not skipping macaroon processing.
if !ctx.GlobalBool("no-macaroons") && !skipMacaroons {
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// Load the specified macaroon file.
macBytes, err := ioutil.ReadFile(macPath)
if err != nil {
fatal(fmt.Errorf("unable to read macaroon path (check "+
"the network setting!): %v", err))
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}
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mac := &macaroon.Macaroon{}
if err = mac.UnmarshalBinary(macBytes); err != nil {
fatal(fmt.Errorf("unable to decode macaroon: %v", err))
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}
macConstraints := []macaroons.Constraint{
// We add a time-based constraint to prevent replay of the
// macaroon. It's good for 60 seconds by default to make up for
// any discrepancy between client and server clocks, but leaking
// the macaroon before it becomes invalid makes it possible for
// an attacker to reuse the macaroon. In addition, the validity
// time of the macaroon is extended by the time the server clock
// is behind the client clock, or shortened by the time the
// server clock is ahead of the client clock (or invalid
// altogether if, in the latter case, this time is more than 60
// seconds).
// TODO(aakselrod): add better anti-replay protection.
macaroons.TimeoutConstraint(ctx.GlobalInt64("macaroontimeout")),
// Lock macaroon down to a specific IP address.
macaroons.IPLockConstraint(ctx.GlobalString("macaroonip")),
// ... Add more constraints if needed.
}
// Apply constraints to the macaroon.
constrainedMac, err := macaroons.AddConstraints(mac, macConstraints...)
if err != nil {
fatal(err)
}
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// Now we append the macaroon credentials to the dial options.
cred := macaroons.NewMacaroonCredential(constrainedMac)
opts = append(opts, grpc.WithPerRPCCredentials(cred))
}
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// We need to use a custom dialer so we can also connect to unix sockets
// and not just TCP addresses.
genericDialer := lncfg.ClientAddressDialer(defaultRPCPort)
opts = append(opts, grpc.WithDialer(genericDialer))
opts = append(opts, grpc.WithDefaultCallOptions(maxMsgRecvSize))
conn, err := grpc.Dial(ctx.GlobalString("rpcserver"), opts...)
if err != nil {
fatal(fmt.Errorf("unable to connect to RPC server: %v", err))
}
return conn
}
// extractPathArgs parses the TLS certificate and macaroon paths from the
// command.
func extractPathArgs(ctx *cli.Context) (string, string, error) {
// We'll start off by parsing the active chain and network. These are
// needed to determine the correct path to the macaroon when not
// specified.
chain := strings.ToLower(ctx.GlobalString("chain"))
switch chain {
case "bitcoin", "litecoin":
default:
return "", "", fmt.Errorf("unknown chain: %v", chain)
}
network := strings.ToLower(ctx.GlobalString("network"))
switch network {
case "mainnet", "testnet", "regtest", "simnet":
default:
return "", "", fmt.Errorf("unknown network: %v", network)
}
// We'll now fetch the lnddir so we can make a decision on how to
// properly read the macaroons (if needed) and also the cert. This will
// either be the default, or will have been overwritten by the end
// user.
lndDir := cleanAndExpandPath(ctx.GlobalString("lnddir"))
// If the macaroon path as been manually provided, then we'll only
// target the specified file.
var macPath string
if ctx.GlobalString("macaroonpath") != "" {
macPath = cleanAndExpandPath(ctx.GlobalString("macaroonpath"))
} else {
// Otherwise, we'll go into the path:
// lnddir/data/chain/<chain>/<network> in order to fetch the
// macaroon that we need.
macPath = filepath.Join(
lndDir, defaultDataDir, defaultChainSubDir, chain,
network, defaultMacaroonFilename,
)
}
tlsCertPath := cleanAndExpandPath(ctx.GlobalString("tlscertpath"))
// If a custom lnd directory was set, we'll also check if custom paths
// for the TLS cert and macaroon file were set as well. If not, we'll
// override their paths so they can be found within the custom lnd
// directory set. This allows us to set a custom lnd directory, along
// with custom paths to the TLS cert and macaroon file.
if lndDir != defaultLndDir {
tlsCertPath = filepath.Join(lndDir, defaultTLSCertFilename)
}
return tlsCertPath, macPath, nil
}
func main() {
app := cli.NewApp()
app.Name = "lncli"
app.Version = build.Version()
app.Usage = "control plane for your Lightning Network Daemon (lnd)"
app.Flags = []cli.Flag{
cli.StringFlag{
Name: "rpcserver",
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Value: defaultRPCHostPort,
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Usage: "host:port of ln daemon",
},
cli.StringFlag{
Name: "lnddir",
Value: defaultLndDir,
Usage: "path to lnd's base directory",
},
cli.StringFlag{
Name: "tlscertpath",
Value: defaultTLSCertPath,
Usage: "path to TLS certificate",
},
cli.StringFlag{
Name: "chain, c",
Usage: "the chain lnd is running on e.g. bitcoin",
Value: "bitcoin",
},
cli.StringFlag{
Name: "network, n",
Usage: "the network lnd is running on e.g. mainnet, " +
"testnet, etc.",
Value: "mainnet",
},
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cli.BoolFlag{
Name: "no-macaroons",
Usage: "disable macaroon authentication",
},
cli.StringFlag{
Name: "macaroonpath",
Usage: "path to macaroon file",
},
cli.Int64Flag{
Name: "macaroontimeout",
Value: 60,
Usage: "anti-replay macaroon validity time in seconds",
},
cli.StringFlag{
Name: "macaroonip",
Usage: "if set, lock macaroon to specific IP address",
},
}
app.Commands = []cli.Command{
createCommand,
unlockCommand,
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changePasswordCommand,
newAddressCommand,
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estimateFeeCommand,
sendManyCommand,
sendCoinsCommand,
listUnspentCommand,
connectCommand,
disconnectCommand,
openChannelCommand,
closeChannelCommand,
closeAllChannelsCommand,
abandonChannelCommand,
listPeersCommand,
walletBalanceCommand,
channelBalanceCommand,
getInfoCommand,
pendingChannelsCommand,
sendPaymentCommand,
payInvoiceCommand,
sendToRouteCommand,
addInvoiceCommand,
lookupInvoiceCommand,
listInvoicesCommand,
listChannelsCommand,
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closedChannelsCommand,
listPaymentsCommand,
describeGraphCommand,
getChanInfoCommand,
getNodeInfoCommand,
queryRoutesCommand,
getNetworkInfoCommand,
debugLevelCommand,
decodePayReqCommand,
listChainTxnsCommand,
stopCommand,
signMessageCommand,
verifyMessageCommand,
feeReportCommand,
updateChannelPolicyCommand,
forwardingHistoryCommand,
exportChanBackupCommand,
restoreChanBackupCommand,
}
// Add any extra autopilot commands determined by build flags.
app.Commands = append(app.Commands, autopilotCommands()...)
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app.Commands = append(app.Commands, invoicesCommands()...)
if err := app.Run(os.Args); err != nil {
fatal(err)
}
}
// cleanAndExpandPath expands environment variables and leading ~ in the
// passed path, cleans the result, and returns it.
// This function is taken from https://github.com/btcsuite/btcd
func cleanAndExpandPath(path string) string {
if path == "" {
return ""
}
// Expand initial ~ to OS specific home directory.
if strings.HasPrefix(path, "~") {
var homeDir string
user, err := user.Current()
if err == nil {
homeDir = user.HomeDir
} else {
homeDir = os.Getenv("HOME")
}
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))
}