config.go

package main

import (
	"bufio"
	"crypto/rand"
	"encoding/base64"
	"io"
	"net"
	"os"
	"path/filepath"
	"strings"
	"time"

	"github.com/hawkit/btcd-demo/chaincfg"
	"github.com/hawkit/btcd-demo/peer"

	"fmt"
	"runtime"
	"sort"
	"strconv"

	"github.com/hawkit/btcd-demo/blockchain"
	"github.com/hawkit/btcd-demo/chaincfg/chainhash"
	"github.com/hawkit/btcd-demo/database"
	"github.com/hawkit/btcd-demo/mempool"

	_ "github.com/hawkit/btcd-demo/database/ffldb"

	"github.com/hawkit/btcd-demo/connmgr"

	"github.com/hawkit/btcutil-demo"
	"github.com/hawkit/go-socks/socks"
	flags "github.com/jessevdk/go-flags"
	"github.com/pkg/errors"
)

const (
	defaultConfigFilename        = "btcd.conf"
	dafaultDataDirname           = "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, sampleConfigFilename)
	defaultDataDir     = filepath.Join(defaultHomeDir, dafaultDataDirname)
	defaultLogDir      = filepath.Join(defaultHomeDir, defaultLogFilename)
	defaultRPCKeyFile  = filepath.Join(defaultHomeDir, "rpc.key")
	defaultRPCCertFile = filepath.Join(defaultHomeDir, "rpc.cert")
	knownDbTypes       = database.SupportedDrivers()
)

// 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 case to flots
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 {
	ShowVersion          bool          `short:"V" long:"version" description:"Display version information and exit"`
	ConfigFile           string        `short:"C" long:"configfile" description:"Path to configuration file"`
	DataDir              string        `short:"b" long:"datadir" description:"Directory to store data"`
	LogDir               string        `long:"logdir" description:"Directory to log output."`
	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"`
	DisableListen        bool          `long:"onlisten" description:"Disable listening for incoming connections -- NOTE: listening is automatically disable if the --connect or --proxy are used without also specifying listen interfaces via -- listen"`
	Listeners            []string      `long:"listen" description:"Add an interface/port to listen for connections(default all interface port: 8333, testnet: 18333)"`
	MaxPeers             int           `long:"maxpeers" description:"Max number of inbound and outbound peers"`
	DisableBanning       bool          `long:"nobanning" description:"Disable banning of misbehaving 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"`
	Whitelists           []string      `long:"whitelist" description:"Add an IP network or IP that will not be banned. (eg. 192.168.1.0/24 or ::1)"`
	RPCUser              string        `short:"u" long:"rpcuser" description:"Username for RPC connections"`
	RPCPass              string        `short:"p" long:"rpcpass" default-mask:"-" description:"Password for RPC connections"`
	RPCLimitUser         string        `long:"rpclimituser" description:"Username for limited RPC connections"`
	RPCLimitPass         string        `long:"rpclimitpass" default-mask:"-" description:"Password for limited RPC connections"`
	RPCListeners         []string      `long:"rpclisten" description:"Add an interface/port to listen for RPC connections(default port: 8334, testnet: 18334)"`
	RPCCert              string        `long:"rpccert" description:"File containing the certification file"`
	RPCKey               string        `long:"rpckey" description:"File containing the certificate key"`
	RPCMaxClients        int           `long:"rpcmaxclients" description:"Max number of RPC clients for standard connections"`
	RPCMaxWebsockets     int           `long:"rpcmaxwebsockets" description:"Max number of RPC websocket connections"`
	RPCMaxConcurrentReqs int           `long:"rpcmaxconcurrentreqs" description:"Max number of concurrent RPC requests that may be processed concurrently"`
	RPCQuirks            bool          `long:"rpcquirks" description:"Mirrow some JSON-RPC quirks of Bitcoin Core -- NOTE: Discouraged unless interoperability issues need to be worked around"`
	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"`
	DisableTLS           bool          `long:"notls" description:"Disable TLS for the RPC server -- NOTE: this is only allowed if the RPC server is bound to localhost"`
	DisableDNSSeed       bool          `long:"nodnsssed" description:"Disable DNS seeding for peers"`
	ExternalIPs          []string      `long:"externalip" description:"Add an ip to the list of local addresses we claim to listen on to peers"`
	Proxy                string        `long:"proxy" description:"Connect via SOCKET5 proxy (eg. 127.0.0.1:9050)"`
	ProxyUser            string        `long:"proxyuser" description:"Username for proxy server"`
	ProxyPass            string        `long:"proxypass" default-mask:"-" description:"Password for proxy server"`
	OnionProxy           string        `long:"onion" description:"Connect to tor hide services via SOCK5 proxy (eg. 127.0.0.1:9050)"`
	OnionProxyUser       string        `long:"onionuser" description:"Username for onion proxy server"`
	OnionProxyPass       string        `long:"onionpass" default-mask:"-" description:"Password for onion proxy server"`
	NoOnion              bool          `long:"noonion" description:"Disable connecting to tor hide services"`
	TorIsolation         bool          `long:"torisolation" description:"Enable Tor stream isolation by randomizing user credentials for each connection."`
	TestNet3             bool          `long:"testnet" description:"Use the test network"`
	RegressionTest       bool          `bool:"regtest" description:"Use the regression test network"`
	SimNet               bool          `long:"simnet" description:"Use the simulation test network"`
	AddCheckpoints       []string      `long:"addcheckpoint" description:"Add a custom checkpoint. Format:'<height>:<hash>'"`
	DisableCheckpoints   bool          `long:"nocheckpoint" description:"Disable built-in checkpoints. Don't do this unless you know what you're doing.'"`
	DbType               string        `long:"dbtype" description:"Database backend to use for the Block Chain."`
	Profile              string        `long:"profile" description:"Enable HTTP profiling on given port -- NOTE port must between 1024 and 65536"`
	CPUProfile           string        `long:"cpuprofile" description:"Write CPU profile to the specified file"`
	DebugLevel           string        `short:"d" long:"debuglevel" description:"Logging level for all subsystems {trace, debug, info, warn, error, critical} -- You may also specify <subsytem>=<level>, ... to se the log level for individual subsystems -- Use show to list available subsystems"`
	Upnp                 bool          `long:"upnp" description:"Use UPnP to map our listening port outside of NAT"`
	MinRelayTxFee        float64       `long:"minrelaytxfee" description:"The minimum transaction fee in BTC/kB to be considered a non-zero fee"`
	FreeTxRelayLimit     float64       `long:"limitfreerelay" description:"Limit relay of transactions with no transaction fee to the given amount in thousands of bytes per minute"`
	NoRelayPriority      bool          `long:"norelaypriority" description:"Do not require free or low-fee transaction fee to the given amount in thousands of bytes per minute"`
	TrickleInterval      time.Duration `long:"trickleinterval" description:"Minimum time between attempts to send new inventory to a new connected peer"`
	MaxOrphanTxs         int           `long:"maxorphantxs" description:"Max number of orphan transactions to keep in memory"`
	Generate             bool          `long:"generate" description:"Generate(mine) bitcoins using the CPU"`
	MiningAddrs          []string      `long:"miningaddr" description:"Add the specified payment address to the list of address to use for generated blocks -- At least one address is required if the generate option is set"`
	BlockMinSize         uint32        `long:"blockminsize" description:"Minimum block size in bytes to be used when creating a block"`
	BlockMaxSize         uint32        `long:"blockmaxsize" description:"Maximum block size in bytes to be used when creating a block"`
	BlockMinWeight       uint32        `long:"blockminweight" description:"Minimum block weight to be used when creating a block"`
	BlockMaxWeight       uint32        `long:"blockmaxweight" description:"Maximum block weight to be used when creating a block"`
	BlockPrioritySize    uint32        `long:"blockprioritySize" description:"Size in bytes for high-priority/low-free transactions when creating a block"`
	UserAgentComments    []string      `long:"uacomment" description:"Comment to add to the user agent -- See BIP 14 for more information"`
	NoPeerBloomFilters   bool          `long:"nopeerbloomfilters" description:"Disable bloom filtering support"`
	NoCFilters           bool          `long:"nocfilters" description:"Disable committed filtering(CF) support"`
	DropCfIndex          bool          `long:"dropcfindex" description:"Deletes the index used for committed filtering (CF) support from the database on start up and then exist"`
	SigCacheMaxSize      uint          `long:"sigcachemaxsize" description:"The maximum number of entries in the signature verification cache"`
	BlocksOnly           bool          `long:"blocksonly" description:"Do not accept transactions from remote peers."`
	TxIndex              bool          `long:"txindex" description:"Maintain a full hash-based transaction index which makes all transactions available via the getrawtransaction RPC"`
	DropTxIndex          bool          `long:"droptxindex" description:"Deletes the hash-based transaction index form the database on start up and then exits. "`
	AddrIndex            bool          `long:"addrindex" description:"Maintain a full address-based transaction index which makes the searchrawtransactions RPC available"`
	DropAddrIndex        bool          `long:"dropaddrindex" description:"Deletes the address-based transaction index from the database on start up and then exists."`
	RelayNonStd          bool          `long:"relaynonstd" description:"Relay non-standard transactions regardless of the default settings for the active network."`
	RejectNonStd         bool          `long:"rejectnonstd" description:"Reject non-standard transactions regardless of the default setting for the active network."`

	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)
	}
	return filepath.Clean(os.ExpandEnv(path))
}

// validateLogLevel returns whether or not logLevel is a valid debug log level.
func validateLogLevel(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 purpose
func supportedSubsystems() []string {
	// Convert the subsystemLoggers map keys to a slice
	subsytems := make([]string, 0, len(subsystemLoggers))
	for subSysId := range subsystemLoggers {
		subsytems = append(subsytems, subSysId)
	}

	// Sort the subsystems for stable display
	sort.Strings(subsytems)
	return subsytems
}

// 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 !validateLogLevel(debugLevel) {
			str := "The specified debug level [%v] is invalid"
			return fmt.Errorf(str, debugLevel)
		}

		// Change the logging level for all subsystem
		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 pari [%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 subsystems %v"
			return fmt.Errorf(str, subsysID, supportedSubsystems())
		}

		// Validate log level.
		if !validateLogLevel(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
}

// 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)
}

// removeDuplicateAddress 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 _, addr := range addrs {
		if _, ok := seen[addr]; !ok {
			seen[addr] = struct{}{}
			result = append(result, addr)
		}
	}
	return result
}

// 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 valide syntask
// ('<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 {
		cp, err := newCheckpointFromStr(cpString)
		if err != nil {
			return nil, err
		}
		checkpoints[i] = cp
	}
	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 通过配置文件，命令行选项来初始化配置
//
// 配置处理按下面的流程进行：
// 1 ) 启动时，使用默认配置
// 2 ) 预解释命令行，检查是否有另外指定的配置文件
// 3 ) 加载配置文件，并覆盖默认设置
// 4 ) 解释命令行选项，覆盖或添加新指定的配置
//

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:         defaultMaxOrphanTxSize,
		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 aws specified. Any errors aside from the
	// help message error can be ignored here since they will be caught by
	// 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 form file
	var configFileError error
	parser := newConfigParser(&cfg, &serviceOpts, flags.Default)
	if !(preCfg.RegressionTest || preCfg.SimNet) || 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 agian 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++
		activeNetParams = &simNetParams
	}
	if numNets > 1 {
		str := "%s: The testnet, regtest, segnet, and simnet params " +
			"can't be used together -- choose on of the four"
		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 action network. The set
	// configuration value takes precedence over the default value for
	// the selected network.
	relayNotStd := 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:
		relayNotStd = false
	case cfg.RelayNonStd:
		relayNotStd = true
	}
	cfg.RelayNonStd = relayNotStd

	// 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 peice 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 ratation. 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.Fprint(os.Stderr, usageMessage)
			return nil, nil, err
		}
	}

	// Don't allow ban durations that 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 address 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 name
	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 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 value
	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 {
		str := "%s: the --txindex and --droptxindex " +
			"options may no be activeted at the same time"
		err := fmt.Errorf(str, 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 {
		str := "%s: --addrindex and --droptxindex " +
			"options may not be activated at the same time " +
			"because the address index relies on the transaction index"
		err := fmt.Errorf(str, funcName)
		fmt.Fprintln(os.Stderr, err)
		fmt.Fprintln(os.Stderr, usageMessage)
		return nil, nil, err
	}

	// Check mining address 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 " +
			"address 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 address.
	cfg.Listeners = normalizeAddresses(cfg.Listeners, activeNetParams.DefaultPort)

	// Add default port to all rpc listener addresses if needed and remove
	// duplicate address
	cfg.RPCListeners = normalizeAddresses(cfg.RPCListeners, activeNetParams.rpcPort)

	// Only allow TLS to be disable if the RPC is bound to localhost
	// address
	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 " +
					"invalide: %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 adn --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 strem 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 dail 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 overriden
		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(s string, s2 string, duration 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 prevent 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
	}
	sampleConfigFile := 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
	}
	generatedPass := base64.StdEncoding.EncodeToString(randomBytes)

	src, err := os.Open(sampleConfigFile)
	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=" + generatedPass + "\n"
		}

		if _, err := dest.WriteString(line); err != nil {
			return err
		}
	}

	return nil
}