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btcd
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btcd/config.go

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// Copyright (c) 2013-2017 The btcsuite developers
// Use of this source code is governed by an ISC
// license that can be found in the LICENSE file.
package main
import (
"bufio"
"crypto/rand"
"encoding/base64"
"encoding/hex"
"errors"
"fmt"
"io"
"net"
"os"
"path/filepath"
"runtime"
"sort"
"strconv"
"strings"
"time"
"github.com/btcsuite/btcd/blockchain"
"github.com/btcsuite/btcd/chaincfg"
"github.com/btcsuite/btcd/chaincfg/chainhash"
"github.com/btcsuite/btcd/connmgr"
"github.com/btcsuite/btcd/database"
_ "github.com/btcsuite/btcd/database/ffldb"
"github.com/btcsuite/btcd/mempool"
"github.com/btcsuite/btcd/peer"
"github.com/btcsuite/btcd/wire"
"github.com/btcsuite/btcutil"
"github.com/btcsuite/go-socks/socks"
flags "github.com/jessevdk/go-flags"
)
const (
defaultConfigFilename = "btcd.conf"
defaultDataDirname = "data"
defaultLogLevel = "info"
defaultLogDirname = "logs"
defaultLogFilename = "btcd.log"
defaultMaxPeers = 125
defaultBanDuration = time.Hour * 24
defaultBanThreshold = 100
defaultConnectTimeout = time.Second * 30
defaultMaxRPCClients = 10
defaultMaxRPCWebsockets = 25
defaultMaxRPCConcurrentReqs = 20
defaultDbType = "ffldb"
defaultFreeTxRelayLimit = 15.0
defaultTrickleInterval = peer.DefaultTrickleInterval
defaultBlockMinSize = 0
defaultBlockMaxSize = 750000
defaultBlockMinWeight = 0
defaultBlockMaxWeight = 3000000
blockMaxSizeMin = 1000
blockMaxSizeMax = blockchain.MaxBlockBaseSize - 1000
blockMaxWeightMin = 4000
blockMaxWeightMax = blockchain.MaxBlockWeight - 4000
defaultGenerate = false
defaultMaxOrphanTransactions = 100
defaultMaxOrphanTxSize = 100000
defaultSigCacheMaxSize = 100000
sampleConfigFilename = "sample-btcd.conf"
defaultTxIndex = false
defaultAddrIndex = false
)
var (
defaultHomeDir = btcutil.AppDataDir("btcd", false)
defaultConfigFile = filepath.Join(defaultHomeDir, defaultConfigFilename)
defaultDataDir = filepath.Join(defaultHomeDir, defaultDataDirname)
knownDbTypes = database.SupportedDrivers()
defaultRPCKeyFile = filepath.Join(defaultHomeDir, "rpc.key")
defaultRPCCertFile = filepath.Join(defaultHomeDir, "rpc.cert")
defaultLogDir = filepath.Join(defaultHomeDir, defaultLogDirname)
)
// runServiceCommand is only set to a real function on Windows. It is used
// to parse and execute service commands specified via the -s flag.
var runServiceCommand func(string) error
// minUint32 is a helper function to return the minimum of two uint32s.
// This avoids a math import and the need to cast to floats.
func minUint32(a, b uint32) uint32 {
if a < b {
return a
}
return b
}
// config defines the configuration options for btcd.
//
// See loadConfig for details on the configuration load process.
type config struct {
AddCheckpoints []string `long:"addcheckpoint" description:"Add a custom checkpoint. Format: '<height>:<hash>'"`
AddPeers []string `short:"a" long:"addpeer" description:"Add a peer to connect with at startup"`
AddrIndex bool `long:"addrindex" description:"Maintain a full address-based transaction index which makes the searchrawtransactions RPC available"`
AgentBlacklist []string `long:"agentblacklist" description:"A comma separated list of user-agent substrings which will cause btcd to reject any peers whose user-agent contains any of the blacklisted substrings."`
AgentWhitelist []string `long:"agentwhitelist" description:"A comma separated list of user-agent substrings which will cause btcd to require all peers' user-agents to contain one of the whitelisted substrings. The blacklist is applied before the blacklist, and an empty whitelist will allow all agents that do not fail the blacklist."`
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."`
BlockMaxSize uint32 `long:"blockmaxsize" description:"Maximum block size in bytes to be used when creating a block"`
BlockMinSize uint32 `long:"blockminsize" description:"Mininum block size in bytes to be used when creating a block"`
BlockMaxWeight uint32 `long:"blockmaxweight" description:"Maximum block weight to be used when creating a block"`
BlockMinWeight uint32 `long:"blockminweight" description:"Mininum block weight to be used when creating a block"`
BlockPrioritySize uint32 `long:"blockprioritysize" description:"Size in bytes for high-priority/low-fee transactions when creating a block"`
BlocksOnly bool `long:"blocksonly" description:"Do not accept transactions from remote peers."`
ConfigFile string `short:"C" long:"configfile" description:"Path to configuration file"`
ConnectPeers []string `long:"connect" description:"Connect only to the specified peers at startup"`
CPUProfile string `long:"cpuprofile" description:"Write CPU profile to the specified file"`
DataDir string `short:"b" long:"datadir" description:"Directory to store data"`
DbType string `long:"dbtype" description:"Database backend to use for the Block Chain"`
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"`
DropAddrIndex bool `long:"dropaddrindex" description:"Deletes the address-based transaction index from the database on start up and then exits."`
DropCfIndex bool `long:"dropcfindex" description:"Deletes the index used for committed filtering (CF) support from the database on start up and then exits."`
DropTxIndex bool `long:"droptxindex" description:"Deletes the hash-based transaction index from the database on start up and then exits."`
ExternalIPs []string `long:"externalip" description:"Add an ip to the list of local addresses we claim to listen on to peers"`
Generate bool `long:"generate" description:"Generate (mine) bitcoins using the CPU"`
FreeTxRelayLimit float64 `long:"limitfreerelay" description:"Limit relay of transactions with no transaction fee to the given amount in thousands of bytes per minute"`
Listeners []string `long:"listen" description:"Add an interface/port to listen for connections (default all interfaces port: 8333, testnet: 18333)"`
LogDir string `long:"logdir" description:"Directory to log output."`
MaxOrphanTxs int `long:"maxorphantx" description:"Max number of orphan transactions to keep in memory"`
MaxPeers int `long:"maxpeers" description:"Max number of inbound and outbound peers"`
MiningAddrs []string `long:"miningaddr" description:"Add the specified payment address to the list of addresses to use for generated blocks -- At least one address is required if the generate option is set"`
MinRelayTxFee float64 `long:"minrelaytxfee" description:"The minimum transaction fee in BTC/kB to be considered a non-zero fee."`
DisableBanning bool `long:"nobanning" description:"Disable banning of misbehaving peers"`
NoCFilters bool `long:"nocfilters" description:"Disable committed filtering (CF) support"`
DisableCheckpoints bool `long:"nocheckpoints" description:"Disable built-in checkpoints. Don't do this unless you know what you're doing."`
DisableDNSSeed bool `long:"nodnsseed" description:"Disable DNS seeding for peers"`
DisableListen bool `long:"nolisten" description:"Disable listening for incoming connections -- NOTE: Listening is automatically disabled if the --connect or --proxy options are used without also specifying listen interfaces via --listen"`
NoOnion bool `long:"noonion" description:"Disable connecting to tor hidden services"`
NoPeerBloomFilters bool `long:"nopeerbloomfilters" description:"Disable bloom filtering support"`
NoRelayPriority bool `long:"norelaypriority" description:"Do not require free or low-fee transactions to have high priority for relaying"`
NoWinService bool `long:"nowinservice" description:"Do not start as a background service on Windows -- NOTE: This flag only works on the command line, not in the config file"`
DisableRPC bool `long:"norpc" description:"Disable built-in RPC server -- NOTE: The RPC server is disabled by default if no rpcuser/rpcpass or rpclimituser/rpclimitpass is specified"`
DisableStallHandler bool `long:"nostalldetect" description:"Disables the stall handler system for each peer, useful in simnet/regtest integration tests frameworks"`
DisableTLS bool `long:"notls" description:"Disable TLS for the RPC server -- NOTE: This is only allowed if the RPC server is bound to localhost"`
OnionProxy string `long:"onion" description:"Connect to tor hidden services via SOCKS5 proxy (eg. 127.0.0.1:9050)"`
OnionProxyPass string `long:"onionpass" default-mask:"-" description:"Password for onion proxy server"`
OnionProxyUser string `long:"onionuser" description:"Username for onion proxy server"`
Profile string `long:"profile" description:"Enable HTTP profiling on given port -- NOTE port must be between 1024 and 65536"`
Proxy string `long:"proxy" description:"Connect via SOCKS5 proxy (eg. 127.0.0.1:9050)"`
ProxyPass string `long:"proxypass" default-mask:"-" description:"Password for proxy server"`
ProxyUser string `long:"proxyuser" description:"Username for proxy server"`
RegressionTest bool `long:"regtest" description:"Use the regression test network"`
RejectNonStd bool `long:"rejectnonstd" description:"Reject non-standard transactions regardless of the default settings for the active network."`
RejectReplacement bool `long:"rejectreplacement" description:"Reject transactions that attempt to replace existing transactions within the mempool through the Replace-By-Fee (RBF) signaling policy."`
RelayNonStd bool `long:"relaynonstd" description:"Relay non-standard transactions regardless of the default settings for the active network."`
RPCCert string `long:"rpccert" description:"File containing the certificate file"`
RPCKey string `long:"rpckey" description:"File containing the certificate key"`
RPCLimitPass string `long:"rpclimitpass" default-mask:"-" description:"Password for limited RPC connections"`
RPCLimitUser string `long:"rpclimituser" description:"Username for limited RPC connections"`
RPCListeners []string `long:"rpclisten" description:"Add an interface/port to listen for RPC connections (default port: 8334, testnet: 18334)"`
RPCMaxClients int `long:"rpcmaxclients" description:"Max number of RPC clients for standard connections"`
RPCMaxConcurrentReqs int `long:"rpcmaxconcurrentreqs" description:"Max number of concurrent RPC requests that may be processed concurrently"`
RPCMaxWebsockets int `long:"rpcmaxwebsockets" description:"Max number of RPC websocket connections"`
RPCQuirks bool `long:"rpcquirks" description:"Mirror some JSON-RPC quirks of Bitcoin Core -- NOTE: Discouraged unless interoperability issues need to be worked around"`
RPCPass string `short:"P" long:"rpcpass" default-mask:"-" description:"Password for RPC connections"`
RPCUser string `short:"u" long:"rpcuser" description:"Username for RPC connections"`
SigCacheMaxSize uint `long:"sigcachemaxsize" description:"The maximum number of entries in the signature verification cache"`
SimNet bool `long:"simnet" description:"Use the simulation test network"`
SigNet bool `long:"signet" description:"Use the signet test network"`
SigNetChallenge string `long:"signetchallenge" description:"Connect to a custom signet network defined by this challenge instead of using the global default signet test network -- Can be specified multiple times"`
SigNetSeedNode []string `long:"signetseednode" description:"Specify a seed node for the signet network instead of using the global default signet network seed nodes"`
TestNet3 bool `long:"testnet" description:"Use the test network"`
TorIsolation bool `long:"torisolation" description:"Enable Tor stream isolation by randomizing user credentials for each connection."`
TrickleInterval time.Duration `long:"trickleinterval" description:"Minimum time between attempts to send new inventory to a connected peer"`
TxIndex bool `long:"txindex" description:"Maintain a full hash-based transaction index which makes all transactions available via the getrawtransaction RPC"`
UserAgentComments []string `long:"uacomment" description:"Comment to add to the user agent -- See BIP 14 for more information."`
Upnp bool `long:"upnp" description:"Use UPnP to map our listening port outside of NAT"`
ShowVersion bool `short:"V" long:"version" description:"Display version information and exit"`
Whitelists []string `long:"whitelist" description:"Add an IP network or IP that will not be banned. (eg. 192.168.1.0/24 or ::1)"`
lookup func(string) ([]net.IP, error)
oniondial func(string, string, time.Duration) (net.Conn, error)
dial func(string, string, time.Duration) (net.Conn, error)
addCheckpoints []chaincfg.Checkpoint
miningAddrs []btcutil.Address
minRelayTxFee btcutil.Amount
whitelists []*net.IPNet
}
// serviceOptions defines the configuration options for the daemon as a service on
// Windows.
type serviceOptions struct {
ServiceCommand string `short:"s" long:"service" description:"Service command {install, remove, start, stop}"`
}
// 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(defaultHomeDir)
path = strings.Replace(path, "~", homeDir, 1)
}
// NOTE: The os.ExpandEnv doesn't work with Windows-style %VARIABLE%,
// but they variables can still be expanded via POSIX-style $VARIABLE.
return filepath.Clean(os.ExpandEnv(path))
}
// 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
}
// 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
}
// validDbType returns whether or not dbType is a supported database type.
func validDbType(dbType string) bool {
for _, knownType := range knownDbTypes {
if dbType == knownType {
return true
}
}
return false
}
// removeDuplicateAddresses returns a new slice with all duplicate entries in
// addrs removed.
func removeDuplicateAddresses(addrs []string) []string {
result := make([]string, 0, len(addrs))
seen := map[string]struct{}{}
for _, val := range addrs {
if _, ok := seen[val]; !ok {
result = append(result, val)
seen[val] = struct{}{}
}
}
return result
}
// normalizeAddress returns addr with the passed default port appended if
// there is not already a port specified.
func normalizeAddress(addr, defaultPort string) string {
_, _, err := net.SplitHostPort(addr)
if err != nil {
return net.JoinHostPort(addr, defaultPort)
}
return addr
}
// normalizeAddresses returns a new slice with all the passed peer addresses
// normalized with the given default port, and all duplicates removed.
func normalizeAddresses(addrs []string, defaultPort string) []string {
for i, addr := range addrs {
addrs[i] = normalizeAddress(addr, defaultPort)
}
return removeDuplicateAddresses(addrs)
}
// newCheckpointFromStr parses checkpoints in the '<height>:<hash>' format.
func newCheckpointFromStr(checkpoint string) (chaincfg.Checkpoint, error) {
parts := strings.Split(checkpoint, ":")
if len(parts) != 2 {
return chaincfg.Checkpoint{}, fmt.Errorf("unable to parse "+
"checkpoint %q -- use the syntax <height>:<hash>",
checkpoint)
}
height, err := strconv.ParseInt(parts[0], 10, 32)
if err != nil {
return chaincfg.Checkpoint{}, fmt.Errorf("unable to parse "+
"checkpoint %q due to malformed height", checkpoint)
}
if len(parts[1]) == 0 {
return chaincfg.Checkpoint{}, fmt.Errorf("unable to parse "+
"checkpoint %q due to missing hash", checkpoint)
}
hash, err := chainhash.NewHashFromStr(parts[1])
if err != nil {
return chaincfg.Checkpoint{}, fmt.Errorf("unable to parse "+
"checkpoint %q due to malformed hash", checkpoint)
}
return chaincfg.Checkpoint{
Height: int32(height),
Hash: hash,
}, nil
}
// parseCheckpoints checks the checkpoint strings for valid syntax
// ('<height>:<hash>') and parses them to chaincfg.Checkpoint instances.
func parseCheckpoints(checkpointStrings []string) ([]chaincfg.Checkpoint, error) {
if len(checkpointStrings) == 0 {
return nil, nil
}
checkpoints := make([]chaincfg.Checkpoint, len(checkpointStrings))
for i, cpString := range checkpointStrings {
checkpoint, err := newCheckpointFromStr(cpString)
if err != nil {
return nil, err
}
checkpoints[i] = checkpoint
}
return checkpoints, nil
}
// filesExists reports whether the named file or directory exists.
func fileExists(name string) bool {
if _, err := os.Stat(name); err != nil {
if os.IsNotExist(err) {
return false
}
}
return true
}
// newConfigParser returns a new command line flags parser.
func newConfigParser(cfg *config, so *serviceOptions, options flags.Options) *flags.Parser {
parser := flags.NewParser(cfg, options)
if runtime.GOOS == "windows" {
parser.AddGroup("Service Options", "Service Options", so)
}
return parser
}
// 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
//
// The above results in btcd functioning properly without any config settings
// while still allowing the user to override settings with config files and
// command line options. Command line options always take precedence.
func loadConfig() (*config, []string, error) {
// Default config.
cfg := config{
ConfigFile: defaultConfigFile,
DebugLevel: defaultLogLevel,
MaxPeers: defaultMaxPeers,
BanDuration: defaultBanDuration,
BanThreshold: defaultBanThreshold,
RPCMaxClients: defaultMaxRPCClients,
RPCMaxWebsockets: defaultMaxRPCWebsockets,
RPCMaxConcurrentReqs: defaultMaxRPCConcurrentReqs,
DataDir: defaultDataDir,
LogDir: defaultLogDir,
DbType: defaultDbType,
RPCKey: defaultRPCKeyFile,
RPCCert: defaultRPCCertFile,
MinRelayTxFee: mempool.DefaultMinRelayTxFee.ToBTC(),
FreeTxRelayLimit: defaultFreeTxRelayLimit,
TrickleInterval: defaultTrickleInterval,
BlockMinSize: defaultBlockMinSize,
BlockMaxSize: defaultBlockMaxSize,
BlockMinWeight: defaultBlockMinWeight,
BlockMaxWeight: defaultBlockMaxWeight,
BlockPrioritySize: mempool.DefaultBlockPrioritySize,
MaxOrphanTxs: defaultMaxOrphanTransactions,
SigCacheMaxSize: defaultSigCacheMaxSize,
Generate: defaultGenerate,
TxIndex: defaultTxIndex,
AddrIndex: defaultAddrIndex,
}
// Service options which are only added on Windows.
serviceOpts := serviceOptions{}
// Pre-parse the command line options to see if an alternative config
// file or the version flag was specified. Any errors aside from the
// help message error can be ignored here since they will be caught by
// the final parse below.
preCfg := cfg
preParser := newConfigParser(&preCfg, &serviceOpts, flags.HelpFlag)
_, err := preParser.Parse()
if err != nil {
if e, ok := err.(*flags.Error); ok && e.Type == flags.ErrHelp {
fmt.Fprintln(os.Stderr, err)
return nil, 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)
}
// Perform service command and exit if specified. Invalid service
// commands show an appropriate error. Only runs on Windows since
// the runServiceCommand function will be nil when not on Windows.
if serviceOpts.ServiceCommand != "" && runServiceCommand != nil {
err := runServiceCommand(serviceOpts.ServiceCommand)
if err != nil {
fmt.Fprintln(os.Stderr, err)
}
os.Exit(0)
}
// Load additional config from file.
var configFileError error
parser := newConfigParser(&cfg, &serviceOpts, flags.Default)
if !(preCfg.RegressionTest || preCfg.SimNet || preCfg.SigNet) ||
preCfg.ConfigFile != defaultConfigFile {
if _, err := os.Stat(preCfg.ConfigFile); os.IsNotExist(err) {
err := createDefaultConfigFile(preCfg.ConfigFile)
if err != nil {
fmt.Fprintf(os.Stderr, "Error creating a "+
"default config file: %v\n", err)
}
}
err := flags.NewIniParser(parser).ParseFile(preCfg.ConfigFile)
if err != nil {
if _, ok := err.(*os.PathError); !ok {
fmt.Fprintf(os.Stderr, "Error parsing config "+
"file: %v\n", err)
fmt.Fprintln(os.Stderr, usageMessage)
return nil, nil, err
}
configFileError = err
}
}
// Don't add peers from the config file when in regression test mode.
if preCfg.RegressionTest && len(cfg.AddPeers) > 0 {
cfg.AddPeers = nil
}
// Parse command line options again to ensure they take precedence.
remainingArgs, err := parser.Parse()
if err != nil {
if e, ok := err.(*flags.Error); !ok || e.Type != flags.ErrHelp {
fmt.Fprintln(os.Stderr, usageMessage)
}
return nil, nil, err
}
// Create the home directory if it doesn't already exist.
funcName := "loadConfig"
err = os.MkdirAll(defaultHomeDir, 0700)
if 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, nil, err
}
// Multiple networks can't be selected simultaneously.
numNets := 0
// Count number of network flags passed; assign active network params
// while we're at it
if cfg.TestNet3 {
numNets++
activeNetParams = &testNet3Params
}
if cfg.RegressionTest {
numNets++
activeNetParams = &regressionNetParams
}
if cfg.SimNet {
numNets++
// Also disable dns seeding on the simulation test network.
activeNetParams = &simNetParams
cfg.DisableDNSSeed = true
}
if cfg.SigNet {
numNets++
activeNetParams = &sigNetParams
// Let the user overwrite the default signet parameters. The
// challenge defines the actual signet network to join and the
// seed nodes are needed for network discovery.
sigNetChallenge := chaincfg.DefaultSignetChallenge
sigNetSeeds := chaincfg.DefaultSignetDNSSeeds
if cfg.SigNetChallenge != "" {
challenge, err := hex.DecodeString(cfg.SigNetChallenge)
if err != nil {
str := "%s: Invalid signet challenge, hex " +
"decode failed: %v"
err := fmt.Errorf(str, funcName, err)
fmt.Fprintln(os.Stderr, err)
fmt.Fprintln(os.Stderr, usageMessage)
return nil, nil, err
}
sigNetChallenge = challenge
}
if len(cfg.SigNetSeedNode) > 0 {
sigNetSeeds = make(
[]chaincfg.DNSSeed, len(cfg.SigNetSeedNode),
)
for idx, seed := range cfg.SigNetSeedNode {
sigNetSeeds[idx] = chaincfg.DNSSeed{
Host: seed,
HasFiltering: false,
}
}
}
chainParams := chaincfg.CustomSignetParams(
sigNetChallenge, sigNetSeeds,
)
activeNetParams.Params = &chainParams
}
if numNets > 1 {
str := "%s: The testnet, regtest, segnet, signet and simnet " +
"params can't be used together -- choose one of the " +
"five"
err := fmt.Errorf(str, funcName)
fmt.Fprintln(os.Stderr, err)
fmt.Fprintln(os.Stderr, usageMessage)
return nil, nil, err
}
// If mainnet is active, then we won't allow the stall handler to be
// disabled.
if activeNetParams.Params.Net == wire.MainNet && cfg.DisableStallHandler {
str := "%s: stall handler cannot be disabled on mainnet"
err := fmt.Errorf(str, funcName)
fmt.Fprintln(os.Stderr, err)
fmt.Fprintln(os.Stderr, usageMessage)
return nil, nil, err
}
// Set the default policy for relaying non-standard transactions
// according to the default of the active network. The set
// configuration value takes precedence over the default value for the
// selected network.
relayNonStd := activeNetParams.RelayNonStdTxs
switch {
case cfg.RelayNonStd && cfg.RejectNonStd:
str := "%s: rejectnonstd and relaynonstd cannot be used " +
"together -- choose only one"
err := fmt.Errorf(str, funcName)
fmt.Fprintln(os.Stderr, err)
fmt.Fprintln(os.Stderr, usageMessage)
return nil, nil, err
case cfg.RejectNonStd:
relayNonStd = false
case cfg.RelayNonStd:
relayNonStd = true
}
cfg.RelayNonStd = relayNonStd
// 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.
cfg.DataDir = cleanAndExpandPath(cfg.DataDir)
cfg.DataDir = filepath.Join(cfg.DataDir, netName(activeNetParams))
// 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, netName(activeNetParams))
// Special show command to list supported subsystems and exit.
if cfg.DebugLevel == "show" {
fmt.Println("Supported subsystems", supportedSubsystems())
os.Exit(0)
}
// Initialize log rotation. After log rotation has been initialized, the
// logger variables may be used.
initLogRotator(filepath.Join(cfg.LogDir, defaultLogFilename))
// 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, nil, err
}
// Validate database type.
if !validDbType(cfg.DbType) {
str := "%s: The specified database type [%v] is invalid -- " +
"supported types %v"
err := fmt.Errorf(str, funcName, cfg.DbType, knownDbTypes)
fmt.Fprintln(os.Stderr, err)
fmt.Fprintln(os.Stderr, usageMessage)
return nil, nil, err
}
// 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, nil, err
}
}
// Don't allow ban durations that are too short.
if cfg.BanDuration < time.Second {
str := "%s: The banduration option may not be less than 1s -- parsed [%v]"
err := fmt.Errorf(str, funcName, cfg.BanDuration)
fmt.Fprintln(os.Stderr, err)
fmt.Fprintln(os.Stderr, usageMessage)
return nil, nil, err
}
// Validate any given whitelisted IP addresses and networks.
if len(cfg.Whitelists) > 0 {
var ip net.IP
cfg.whitelists = make([]*net.IPNet, 0, len(cfg.Whitelists))
for _, addr := range cfg.Whitelists {
_, ipnet, err := net.ParseCIDR(addr)
if err != nil {
ip = net.ParseIP(addr)
if ip == nil {
str := "%s: The whitelist value of '%s' is invalid"
err = fmt.Errorf(str, funcName, addr)
fmt.Fprintln(os.Stderr, err)
fmt.Fprintln(os.Stderr, usageMessage)
return nil, nil, err
}
var bits int
if ip.To4() == nil {
// IPv6
bits = 128
} else {
bits = 32
}
ipnet = &net.IPNet{
IP: ip,
Mask: net.CIDRMask(bits, bits),
}
}
cfg.whitelists = append(cfg.whitelists, ipnet)
}
}
// --addPeer and --connect do not mix.
if len(cfg.AddPeers) > 0 && len(cfg.ConnectPeers) > 0 {
str := "%s: the --addpeer and --connect options can not be " +
"mixed"
err := fmt.Errorf(str, funcName)
fmt.Fprintln(os.Stderr, err)
fmt.Fprintln(os.Stderr, usageMessage)
return nil, nil, err
}
// --proxy or --connect without --listen disables listening.
if (cfg.Proxy != "" || len(cfg.ConnectPeers) > 0) &&
len(cfg.Listeners) == 0 {
cfg.DisableListen = true
}
// Connect means no DNS seeding.
if len(cfg.ConnectPeers) > 0 {
cfg.DisableDNSSeed = true
}
// Add the default listener if none were specified. The default
// listener is all addresses on the listen port for the network
// we are to connect to.
if len(cfg.Listeners) == 0 {
cfg.Listeners = []string{
net.JoinHostPort("", activeNetParams.DefaultPort),
}
}
// Check to make sure limited and admin users don't have the same username
if cfg.RPCUser == cfg.RPCLimitUser && cfg.RPCUser != "" {
str := "%s: --rpcuser and --rpclimituser must not specify the " +
"same username"
err := fmt.Errorf(str, funcName)
fmt.Fprintln(os.Stderr, err)
fmt.Fprintln(os.Stderr, usageMessage)
return nil, nil, err
}
// Check to make sure limited and admin users don't have the same password
if cfg.RPCPass == cfg.RPCLimitPass && cfg.RPCPass != "" {
str := "%s: --rpcpass and --rpclimitpass must not specify the " +
"same password"
err := fmt.Errorf(str, funcName)
fmt.Fprintln(os.Stderr, err)
fmt.Fprintln(os.Stderr, usageMessage)
return nil, nil, err
}
// The RPC server is disabled if no username or password is provided.
if (cfg.RPCUser == "" || cfg.RPCPass == "") &&
(cfg.RPCLimitUser == "" || cfg.RPCLimitPass == "") {
cfg.DisableRPC = true
}
if cfg.DisableRPC {
btcdLog.Infof("RPC service is disabled")
}
// Default RPC to listen on localhost only.
if !cfg.DisableRPC && len(cfg.RPCListeners) == 0 {
addrs, err := net.LookupHost("localhost")
if err != nil {
return nil, nil, err
}
cfg.RPCListeners = make([]string, 0, len(addrs))
for _, addr := range addrs {
addr = net.JoinHostPort(addr, activeNetParams.rpcPort)
cfg.RPCListeners = append(cfg.RPCListeners, addr)
}
}
if cfg.RPCMaxConcurrentReqs < 0 {
str := "%s: The rpcmaxwebsocketconcurrentrequests option may " +
"not be less than 0 -- parsed [%d]"
err := fmt.Errorf(str, funcName, cfg.RPCMaxConcurrentReqs)
fmt.Fprintln(os.Stderr, err)
fmt.Fprintln(os.Stderr, usageMessage)
return nil, nil, err
}
// Validate the the minrelaytxfee.
cfg.minRelayTxFee, err = btcutil.NewAmount(cfg.MinRelayTxFee)
if err != nil {
str := "%s: invalid minrelaytxfee: %v"
err := fmt.Errorf(str, funcName, err)
fmt.Fprintln(os.Stderr, err)
fmt.Fprintln(os.Stderr, usageMessage)
return nil, nil, err
}
// Limit the max block size to a sane value.
if cfg.BlockMaxSize < blockMaxSizeMin || cfg.BlockMaxSize >
blockMaxSizeMax {
str := "%s: The blockmaxsize option must be in between %d " +
"and %d -- parsed [%d]"
err := fmt.Errorf(str, funcName, blockMaxSizeMin,
blockMaxSizeMax, cfg.BlockMaxSize)
fmt.Fprintln(os.Stderr, err)
fmt.Fprintln(os.Stderr, usageMessage)
return nil, nil, err
}
// Limit the max block weight to a sane value.
if cfg.BlockMaxWeight < blockMaxWeightMin ||
cfg.BlockMaxWeight > blockMaxWeightMax {
str := "%s: The blockmaxweight option must be in between %d " +
"and %d -- parsed [%d]"
err := fmt.Errorf(str, funcName, blockMaxWeightMin,
blockMaxWeightMax, cfg.BlockMaxWeight)
fmt.Fprintln(os.Stderr, err)
fmt.Fprintln(os.Stderr, usageMessage)
return nil, nil, err
}
// Limit the max orphan count to a sane vlue.
if cfg.MaxOrphanTxs < 0 {
str := "%s: The maxorphantx option may not be less than 0 " +
"-- parsed [%d]"
err := fmt.Errorf(str, funcName, cfg.MaxOrphanTxs)
fmt.Fprintln(os.Stderr, err)
fmt.Fprintln(os.Stderr, usageMessage)
return nil, nil, err
}
// Limit the block priority and minimum block sizes to max block size.
cfg.BlockPrioritySize = minUint32(cfg.BlockPrioritySize, cfg.BlockMaxSize)
cfg.BlockMinSize = minUint32(cfg.BlockMinSize, cfg.BlockMaxSize)
cfg.BlockMinWeight = minUint32(cfg.BlockMinWeight, cfg.BlockMaxWeight)
switch {
// If the max block size isn't set, but the max weight is, then we'll
// set the limit for the max block size to a safe limit so weight takes
// precedence.
case cfg.BlockMaxSize == defaultBlockMaxSize &&
cfg.BlockMaxWeight != defaultBlockMaxWeight:
cfg.BlockMaxSize = blockchain.MaxBlockBaseSize - 1000
// If the max block weight isn't set, but the block size is, then we'll
// scale the set weight accordingly based on the max block size value.
case cfg.BlockMaxSize != defaultBlockMaxSize &&
cfg.BlockMaxWeight == defaultBlockMaxWeight:
cfg.BlockMaxWeight = cfg.BlockMaxSize * blockchain.WitnessScaleFactor
}
// Look for illegal characters in the user agent comments.
for _, uaComment := range cfg.UserAgentComments {
if strings.ContainsAny(uaComment, "/:()") {
err := fmt.Errorf("%s: The following characters must not "+
"appear in user agent comments: '/', ':', '(', ')'",
funcName)
fmt.Fprintln(os.Stderr, err)
fmt.Fprintln(os.Stderr, usageMessage)
return nil, nil, err
}
}
// --txindex and --droptxindex do not mix.
if cfg.TxIndex && cfg.DropTxIndex {
err := fmt.Errorf("%s: the --txindex and --droptxindex "+
"options may not be activated at the same time",
funcName)
fmt.Fprintln(os.Stderr, err)
fmt.Fprintln(os.Stderr, usageMessage)
return nil, nil, err
}
// --addrindex and --dropaddrindex do not mix.
if cfg.AddrIndex && cfg.DropAddrIndex {
err := fmt.Errorf("%s: the --addrindex and --dropaddrindex "+
"options may not be activated at the same time",
funcName)
fmt.Fprintln(os.Stderr, err)
fmt.Fprintln(os.Stderr, usageMessage)
return nil, nil, err
}
// --addrindex and --droptxindex do not mix.
if cfg.AddrIndex && cfg.DropTxIndex {
err := fmt.Errorf("%s: the --addrindex and --droptxindex "+
"options may not be activated at the same time "+
"because the address index relies on the transaction "+
"index",
funcName)
fmt.Fprintln(os.Stderr, err)
fmt.Fprintln(os.Stderr, usageMessage)
return nil, nil, err
}
// Check mining addresses are valid and saved parsed versions.
cfg.miningAddrs = make([]btcutil.Address, 0, len(cfg.MiningAddrs))
for _, strAddr := range cfg.MiningAddrs {
addr, err := btcutil.DecodeAddress(strAddr, activeNetParams.Params)
if err != nil {
str := "%s: mining address '%s' failed to decode: %v"
err := fmt.Errorf(str, funcName, strAddr, err)
fmt.Fprintln(os.Stderr, err)
fmt.Fprintln(os.Stderr, usageMessage)
return nil, nil, err
}
if !addr.IsForNet(activeNetParams.Params) {
str := "%s: mining address '%s' is on the wrong network"
err := fmt.Errorf(str, funcName, strAddr)
fmt.Fprintln(os.Stderr, err)
fmt.Fprintln(os.Stderr, usageMessage)
return nil, nil, err
}
cfg.miningAddrs = append(cfg.miningAddrs, addr)
}
// Ensure there is at least one mining address when the generate flag is
// set.
if cfg.Generate && len(cfg.MiningAddrs) == 0 {
str := "%s: the generate flag is set, but there are no mining " +
"addresses specified "
err := fmt.Errorf(str, funcName)
fmt.Fprintln(os.Stderr, err)
fmt.Fprintln(os.Stderr, usageMessage)
return nil, nil, err
}
// Add default port to all listener addresses if needed and remove
// duplicate addresses.
cfg.Listeners = normalizeAddresses(cfg.Listeners,
activeNetParams.DefaultPort)
// Add default port to all rpc listener addresses if needed and remove
// duplicate addresses.
cfg.RPCListeners = normalizeAddresses(cfg.RPCListeners,
activeNetParams.rpcPort)
// Only allow TLS to be disabled if the RPC is bound to localhost
// addresses.
if !cfg.DisableRPC && cfg.DisableTLS {
allowedTLSListeners := map[string]struct{}{
"localhost": {},
"127.0.0.1": {},
"::1": {},
}
for _, addr := range cfg.RPCListeners {
host, _, err := net.SplitHostPort(addr)
if err != nil {
str := "%s: RPC listen interface '%s' is " +
"invalid: %v"
err := fmt.Errorf(str, funcName, addr, err)
fmt.Fprintln(os.Stderr, err)
fmt.Fprintln(os.Stderr, usageMessage)
return nil, nil, err
}
if _, ok := allowedTLSListeners[host]; !ok {
str := "%s: the --notls option may not be used " +
"when binding RPC to non localhost " +
"addresses: %s"
err := fmt.Errorf(str, funcName, addr)
fmt.Fprintln(os.Stderr, err)
fmt.Fprintln(os.Stderr, usageMessage)
return nil, nil, err
}
}
}
// Add default port to all added peer addresses if needed and remove
// duplicate addresses.
cfg.AddPeers = normalizeAddresses(cfg.AddPeers,
activeNetParams.DefaultPort)
cfg.ConnectPeers = normalizeAddresses(cfg.ConnectPeers,
activeNetParams.DefaultPort)
// --noonion and --onion do not mix.
if cfg.NoOnion && cfg.OnionProxy != "" {
err := fmt.Errorf("%s: the --noonion and --onion options may "+
"not be activated at the same time", funcName)
fmt.Fprintln(os.Stderr, err)
fmt.Fprintln(os.Stderr, usageMessage)
return nil, nil, err
}
// Check the checkpoints for syntax errors.
cfg.addCheckpoints, err = parseCheckpoints(cfg.AddCheckpoints)
if err != nil {
str := "%s: Error parsing checkpoints: %v"
err := fmt.Errorf(str, funcName, err)
fmt.Fprintln(os.Stderr, err)
fmt.Fprintln(os.Stderr, usageMessage)
return nil, nil, err
}
// Tor stream isolation requires either proxy or onion proxy to be set.
if cfg.TorIsolation && cfg.Proxy == "" && cfg.OnionProxy == "" {
str := "%s: Tor stream isolation requires either proxy or " +
"onionproxy to be set"
err := fmt.Errorf(str, funcName)
fmt.Fprintln(os.Stderr, err)
fmt.Fprintln(os.Stderr, usageMessage)
return nil, nil, err
}
// Setup dial and DNS resolution (lookup) functions depending on the
// specified options. The default is to use the standard
// net.DialTimeout function as well as the system DNS resolver. When a
// proxy is specified, the dial function is set to the proxy specific
// dial function and the lookup is set to use tor (unless --noonion is
// specified in which case the system DNS resolver is used).
cfg.dial = net.DialTimeout
cfg.lookup = net.LookupIP
if cfg.Proxy != "" {
_, _, err := net.SplitHostPort(cfg.Proxy)
if err != nil {
str := "%s: Proxy address '%s' is invalid: %v"
err := fmt.Errorf(str, funcName, cfg.Proxy, err)
fmt.Fprintln(os.Stderr, err)
fmt.Fprintln(os.Stderr, usageMessage)
return nil, nil, err
}
// Tor isolation flag means proxy credentials will be overridden
// unless there is also an onion proxy configured in which case
// that one will be overridden.
torIsolation := false
if cfg.TorIsolation && cfg.OnionProxy == "" &&
(cfg.ProxyUser != "" || cfg.ProxyPass != "") {
torIsolation = true
fmt.Fprintln(os.Stderr, "Tor isolation set -- "+
"overriding specified proxy user credentials")
}
proxy := &socks.Proxy{
Addr: cfg.Proxy,
Username: cfg.ProxyUser,
Password: cfg.ProxyPass,
TorIsolation: torIsolation,
}
cfg.dial = proxy.DialTimeout
// Treat the proxy as tor and perform DNS resolution through it
// unless the --noonion flag is set or there is an
// onion-specific proxy configured.
if !cfg.NoOnion && cfg.OnionProxy == "" {
cfg.lookup = func(host string) ([]net.IP, error) {
return connmgr.TorLookupIP(host, cfg.Proxy)
}
}
}
// Setup onion address dial function depending on the specified options.
// The default is to use the same dial function selected above. However,
// when an onion-specific proxy is specified, the onion address dial
// function is set to use the onion-specific proxy while leaving the
// normal dial function as selected above. This allows .onion address
// traffic to be routed through a different proxy than normal traffic.
if cfg.OnionProxy != "" {
_, _, err := net.SplitHostPort(cfg.OnionProxy)
if err != nil {
str := "%s: Onion proxy address '%s' is invalid: %v"
err := fmt.Errorf(str, funcName, cfg.OnionProxy, err)
fmt.Fprintln(os.Stderr, err)
fmt.Fprintln(os.Stderr, usageMessage)
return nil, nil, err
}
// Tor isolation flag means onion proxy credentials will be
// overridden.
if cfg.TorIsolation &&
(cfg.OnionProxyUser != "" || cfg.OnionProxyPass != "") {
fmt.Fprintln(os.Stderr, "Tor isolation set -- "+
"overriding specified onionproxy user "+
"credentials ")
}
cfg.oniondial = func(network, addr string, timeout time.Duration) (net.Conn, error) {
proxy := &socks.Proxy{
Addr: cfg.OnionProxy,
Username: cfg.OnionProxyUser,
Password: cfg.OnionProxyPass,
TorIsolation: cfg.TorIsolation,
}
return proxy.DialTimeout(network, addr, timeout)
}
// When configured in bridge mode (both --onion and --proxy are
// configured), it means that the proxy configured by --proxy is
// not a tor proxy, so override the DNS resolution to use the
// onion-specific proxy.
if cfg.Proxy != "" {
cfg.lookup = func(host string) ([]net.IP, error) {
return connmgr.TorLookupIP(host, cfg.OnionProxy)
}
}
} else {
cfg.oniondial = cfg.dial
}
// Specifying --noonion means the onion address dial function results in
// an error.
if cfg.NoOnion {
cfg.oniondial = func(a, b string, t time.Duration) (net.Conn, error) {
return nil, errors.New("tor has been disabled")
}
}
// 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 {
btcdLog.Warnf("%v", configFileError)
}
return &cfg, remainingArgs, nil
}
// createDefaultConfig copies the file sample-btcd.conf to the given destination path,
// and populates it with some randomly generated RPC username and password.
func createDefaultConfigFile(destinationPath string) error {
// Create the destination directory if it does not exists
err := os.MkdirAll(filepath.Dir(destinationPath), 0700)
if err != nil {
return err
}
// We assume sample config file path is same as binary
path, err := filepath.Abs(filepath.Dir(os.Args[0]))
if err != nil {
return err
}
sampleConfigPath := filepath.Join(path, sampleConfigFilename)
// We generate a random user and password
randomBytes := make([]byte, 20)
_, err = rand.Read(randomBytes)
if err != nil {
return err
}
generatedRPCUser := base64.StdEncoding.EncodeToString(randomBytes)
_, err = rand.Read(randomBytes)
if err != nil {
return err
}
generatedRPCPass := base64.StdEncoding.EncodeToString(randomBytes)
src, err := os.Open(sampleConfigPath)
if err != nil {
return err
}
defer src.Close()
dest, err := os.OpenFile(destinationPath,
os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0600)
if err != nil {
return err
}
defer dest.Close()
// We copy every line from the sample config file to the destination,
// only replacing the two lines for rpcuser and rpcpass
reader := bufio.NewReader(src)
for err != io.EOF {
var line string
line, err = reader.ReadString('\n')
if err != nil && err != io.EOF {
return err
}
if strings.Contains(line, "rpcuser=") {
line = "rpcuser=" + generatedRPCUser + "\n"
} else if strings.Contains(line, "rpcpass=") {
line = "rpcpass=" + generatedRPCPass + "\n"
}
if _, err := dest.WriteString(line); err != nil {
return err
}
}
return nil
}
// btcdDial connects to the address on the named network using the appropriate
// dial function depending on the address and configuration options. For
// example, .onion addresses will be dialed using the onion specific proxy if
// one was specified, but will otherwise use the normal dial function (which
// could itself use a proxy or not).
func btcdDial(addr net.Addr) (net.Conn, error) {
if strings.Contains(addr.String(), ".onion:") {
return cfg.oniondial(addr.Network(), addr.String(),
defaultConnectTimeout)
}
return cfg.dial(addr.Network(), addr.String(), defaultConnectTimeout)
}
// btcdLookup resolves the IP of the given host using the correct DNS lookup
// function depending on the configuration options. For example, addresses will
// be resolved using tor when the --proxy flag was specified unless --noonion
// was also specified in which case the normal system DNS resolver will be used.
//
// Any attempt to resolve a tor address (.onion) will return an error since they
// are not intended to be resolved outside of the tor proxy.
func btcdLookup(host string) ([]net.IP, error) {
if strings.HasSuffix(host, ".onion") {
return nil, fmt.Errorf("attempt to resolve tor address %s", host)
}
return cfg.lookup(host)
}
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