Example #1
0
// Parse and validate flags.
func init() {
	// Unset localhost defaults if certificate file can not be found.
	certFileExists, err := cfgutil.FileExists(opts.RPCCertificateFile)
	if err != nil {
		fatalf("%v", err)
	}
	if !certFileExists {
		opts.RPCConnect = ""
		opts.RPCCertificateFile = ""
	}

	_, err = flags.Parse(&opts)
	if err != nil {
		os.Exit(1)
	}

	if opts.TestNet3 && opts.SimNet {
		fatalf("Multiple bitcoin networks may not be used simultaneously")
	}
	var activeNet = &netparams.MainNetParams
	if opts.TestNet3 {
		activeNet = &netparams.TestNet3Params
	} else if opts.SimNet {
		activeNet = &netparams.SimNetParams
	}

	if opts.RPCConnect == "" {
		fatalf("RPC hostname[:port] is required")
	}
	rpcConnect, err := cfgutil.NormalizeAddress(opts.RPCConnect, activeNet.RPCServerPort)
	if err != nil {
		fatalf("Invalid RPC network address `%v`: %v", opts.RPCConnect, err)
	}
	opts.RPCConnect = rpcConnect

	if opts.RPCUsername == "" {
		fatalf("RPC username is required")
	}

	certFileExists, err = cfgutil.FileExists(opts.RPCCertificateFile)
	if err != nil {
		fatalf("%v", err)
	}
	if !certFileExists {
		fatalf("RPC certificate file `%s` not found", opts.RPCCertificateFile)
	}

	if opts.FeeRate.Amount > 1e6 {
		fatalf("Fee rate `%v/kB` is exceptionally high", opts.FeeRate.Amount)
	}
	if opts.FeeRate.Amount < 1e2 {
		fatalf("Fee rate `%v/kB` is exceptionally low", opts.FeeRate.Amount)
	}
	if opts.SourceAccount == opts.DestinationAccount {
		fatalf("Source and destination accounts should not be equal")
	}
	if opts.RequiredConfirmations < 0 {
		fatalf("Required confirmations must be non-negative")
	}
}
Example #2
0
// 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 btcwallet 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{
		DebugLevel:             defaultLogLevel,
		ConfigFile:             defaultConfigFile,
		DataDir:                defaultDataDir,
		LogDir:                 defaultLogDir,
		WalletPass:             wallet.InsecurePubPassphrase,
		RPCKey:                 defaultRPCKeyFile,
		RPCCert:                defaultRPCCertFile,
		DisallowFree:           defaultDisallowFree,
		LegacyRPCMaxClients:    defaultRPCMaxClients,
		LegacyRPCMaxWebsockets: defaultRPCMaxWebsockets,
	}

	// A config file in the current directory takes precedence.
	exists, err := cfgutil.FileExists(defaultConfigFilename)
	if err != nil {
		fmt.Fprintln(os.Stderr, err)
		return nil, nil, err
	}
	if exists {
		cfg.ConfigFile = defaultConfigFile
	}

	// Pre-parse the command line options to see if an alternative config
	// file or the version flag was specified.
	preCfg := cfg
	preParser := flags.NewParser(&preCfg, flags.Default)
	_, err = preParser.Parse()
	if err != nil {
		if e, ok := err.(*flags.Error); !ok || e.Type != flags.ErrHelp {
			preParser.WriteHelp(os.Stderr)
		}
		return nil, nil, err
	}

	// Show the version and exit if the version flag was specified.
	funcName := "loadConfig"
	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)
	}

	// Load additional config from file.
	var configFileError error
	parser := flags.NewParser(&cfg, flags.Default)
	err = flags.NewIniParser(parser).ParseFile(preCfg.ConfigFile)
	if err != nil {
		if _, ok := err.(*os.PathError); !ok {
			fmt.Fprintln(os.Stderr, err)
			parser.WriteHelp(os.Stderr)
			return nil, nil, err
		}
		configFileError = err
	}

	// 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 {
			parser.WriteHelp(os.Stderr)
		}
		return nil, nil, err
	}

	// Warn about missing config file after the final command line parse
	// succeeds.  This prevents the warning on help messages and invalid
	// options.
	if configFileError != nil {
		log.Warnf("%v", configFileError)
	}

	// If an alternate data directory was specified, and paths with defaults
	// relative to the data dir are unchanged, modify each path to be
	// relative to the new data dir.
	if cfg.DataDir != defaultDataDir {
		if cfg.RPCKey == defaultRPCKeyFile {
			cfg.RPCKey = filepath.Join(cfg.DataDir, "rpc.key")
		}
		if cfg.RPCCert == defaultRPCCertFile {
			cfg.RPCCert = filepath.Join(cfg.DataDir, "rpc.cert")
		}
	}

	// Choose the active network params based on the selected network.
	// Multiple networks can't be selected simultaneously.
	numNets := 0
	if cfg.MainNet {
		activeNet = &netparams.MainNetParams
		numNets++
	}
	if cfg.SimNet {
		activeNet = &netparams.SimNetParams
		numNets++
	}
	if numNets > 1 {
		str := "%s: The mainnet and simnet params can't be used " +
			"together -- choose one"
		err := fmt.Errorf(str, "loadConfig")
		fmt.Fprintln(os.Stderr, err)
		parser.WriteHelp(os.Stderr)
		return nil, nil, err
	}

	// Append the network type to the log directory so it is "namespaced"
	// per network.
	cfg.LogDir = cleanAndExpandPath(cfg.LogDir)
	cfg.LogDir = filepath.Join(cfg.LogDir, activeNet.Params.Name)

	// Special show command to list supported subsystems and exit.
	if cfg.DebugLevel == "show" {
		fmt.Println("Supported subsystems", supportedSubsystems())
		os.Exit(0)
	}

	// Initialize logging at the default logging level.
	initSeelogLogger(filepath.Join(cfg.LogDir, defaultLogFilename))
	setLogLevels(defaultLogLevel)

	// Parse, validate, and set debug log level(s).
	if err := parseAndSetDebugLevels(cfg.DebugLevel); err != nil {
		err := fmt.Errorf("%s: %v", "loadConfig", err.Error())
		fmt.Fprintln(os.Stderr, err)
		parser.WriteHelp(os.Stderr)
		return nil, nil, err
	}

	// Exit if you try to use a simulation wallet with a standard
	// data directory.
	if cfg.DataDir == defaultDataDir && cfg.CreateTemp {
		fmt.Fprintln(os.Stderr, "Tried to create a temporary simulation "+
			"wallet, but failed to specify data directory!")
		os.Exit(0)
	}

	// Exit if you try to use a simulation wallet on anything other than
	// simnet or testnet3.
	if !cfg.SimNet && cfg.CreateTemp {
		fmt.Fprintln(os.Stderr, "Tried to create a temporary simulation "+
			"wallet for network other than simnet!")
		os.Exit(0)
	}

	// Ensure the wallet exists or create it when the create flag is set.
	netDir := networkDir(cfg.DataDir, activeNet.Params)
	dbPath := filepath.Join(netDir, walletDbName)

	if cfg.CreateTemp && cfg.Create {
		err := fmt.Errorf("The flags --create and --createtemp can not " +
			"be specified together. Use --help for more information.")
		fmt.Fprintln(os.Stderr, err)
		return nil, nil, err
	}

	dbFileExists, err := cfgutil.FileExists(dbPath)
	if err != nil {
		fmt.Fprintln(os.Stderr, err)
		return nil, nil, err
	}

	if cfg.CreateTemp {
		tempWalletExists := false

		if dbFileExists {
			str := fmt.Sprintf("The wallet already exists. Loading this " +
				"wallet instead.")
			fmt.Fprintln(os.Stdout, str)
			tempWalletExists = true
		}

		// Ensure the data directory for the network exists.
		if err := checkCreateDir(netDir); err != nil {
			fmt.Fprintln(os.Stderr, err)
			return nil, nil, err
		}

		if !tempWalletExists {
			// Perform the initial wallet creation wizard.
			if err := createSimulationWallet(&cfg); err != nil {
				fmt.Fprintln(os.Stderr, "Unable to create wallet:", err)
				return nil, nil, err
			}
		}
	} else if cfg.Create {
		// Error if the create flag is set and the wallet already
		// exists.
		if dbFileExists {
			err := fmt.Errorf("The wallet database file `%v` "+
				"already exists.", dbPath)
			fmt.Fprintln(os.Stderr, err)
			return nil, nil, err
		}

		// Ensure the data directory for the network exists.
		if err := checkCreateDir(netDir); err != nil {
			fmt.Fprintln(os.Stderr, err)
			return nil, nil, err
		}

		// Perform the initial wallet creation wizard.
		if err := createWallet(&cfg); err != nil {
			fmt.Fprintln(os.Stderr, "Unable to create wallet:", err)
			return nil, nil, err
		}

		// Created successfully, so exit now with success.
		os.Exit(0)
	} else if !dbFileExists && !cfg.NoInitialLoad {
		keystorePath := filepath.Join(netDir, keystore.Filename)
		keystoreExists, err := cfgutil.FileExists(keystorePath)
		if err != nil {
			fmt.Fprintln(os.Stderr, err)
			return nil, nil, err
		}
		if !keystoreExists {
			err = fmt.Errorf("The wallet does not exist.  Run with the " +
				"--create option to initialize and create it.")
		} else {
			err = fmt.Errorf("The wallet is in legacy format.  Run with the " +
				"--create option to import it.")
		}
		fmt.Fprintln(os.Stderr, err)
		return nil, nil, err
	}

	if cfg.RPCConnect == "" {
		cfg.RPCConnect = net.JoinHostPort("localhost", activeNet.RPCClientPort)
	}

	// Add default port to connect flag if missing.
	cfg.RPCConnect, err = cfgutil.NormalizeAddress(cfg.RPCConnect,
		activeNet.RPCClientPort)
	if err != nil {
		fmt.Fprintf(os.Stderr,
			"Invalid rpcconnect network address: %v\n", err)
		return nil, nil, err
	}

	localhostListeners := map[string]struct{}{
		"localhost": struct{}{},
		"127.0.0.1": struct{}{},
		"::1":       struct{}{},
	}
	RPCHost, _, err := net.SplitHostPort(cfg.RPCConnect)
	if err != nil {
		return nil, nil, err
	}
	if cfg.DisableClientTLS {
		if _, ok := localhostListeners[RPCHost]; !ok {
			str := "%s: the --noclienttls option may not be used " +
				"when connecting RPC to non localhost " +
				"addresses: %s"
			err := fmt.Errorf(str, funcName, cfg.RPCConnect)
			fmt.Fprintln(os.Stderr, err)
			fmt.Fprintln(os.Stderr, usageMessage)
			return nil, nil, err
		}
	} else {
		// If CAFile is unset, choose either the copy or local btcd cert.
		if cfg.CAFile == "" {
			cfg.CAFile = filepath.Join(cfg.DataDir, defaultCAFilename)

			// If the CA copy does not exist, check if we're connecting to
			// a local btcd and switch to its RPC cert if it exists.
			certExists, err := cfgutil.FileExists(cfg.CAFile)
			if err != nil {
				fmt.Fprintln(os.Stderr, err)
				return nil, nil, err
			}
			if !certExists {
				if _, ok := localhostListeners[RPCHost]; ok {
					btcdCertExists, err := cfgutil.FileExists(
						btcdHomedirCAFile)
					if err != nil {
						fmt.Fprintln(os.Stderr, err)
						return nil, nil, err
					}
					if btcdCertExists {
						cfg.CAFile = btcdHomedirCAFile
					}
				}
			}
		}
	}

	// Only set default RPC listeners when there are no listeners set for
	// the experimental RPC server.  This is required to prevent the old RPC
	// server from sharing listen addresses, since it is impossible to
	// remove defaults from go-flags slice options without assigning
	// specific behavior to a particular string.
	if len(cfg.ExperimentalRPCListeners) == 0 && len(cfg.LegacyRPCListeners) == 0 {
		addrs, err := net.LookupHost("localhost")
		if err != nil {
			return nil, nil, err
		}
		cfg.LegacyRPCListeners = make([]string, 0, len(addrs))
		for _, addr := range addrs {
			addr = net.JoinHostPort(addr, activeNet.RPCServerPort)
			cfg.LegacyRPCListeners = append(cfg.LegacyRPCListeners, addr)
		}
	}

	// Add default port to all rpc listener addresses if needed and remove
	// duplicate addresses.
	cfg.LegacyRPCListeners, err = cfgutil.NormalizeAddresses(
		cfg.LegacyRPCListeners, activeNet.RPCServerPort)
	if err != nil {
		fmt.Fprintf(os.Stderr,
			"Invalid network address in legacy RPC listeners: %v\n", err)
		return nil, nil, err
	}
	cfg.ExperimentalRPCListeners, err = cfgutil.NormalizeAddresses(
		cfg.ExperimentalRPCListeners, activeNet.RPCServerPort)
	if err != nil {
		fmt.Fprintf(os.Stderr,
			"Invalid network address in RPC listeners: %v\n", err)
		return nil, nil, err
	}

	// Both RPC servers may not listen on the same interface/port.
	if len(cfg.LegacyRPCListeners) > 0 && len(cfg.ExperimentalRPCListeners) > 0 {
		seenAddresses := make(map[string]struct{}, len(cfg.LegacyRPCListeners))
		for _, addr := range cfg.LegacyRPCListeners {
			seenAddresses[addr] = struct{}{}
		}
		for _, addr := range cfg.ExperimentalRPCListeners {
			_, seen := seenAddresses[addr]
			if seen {
				err := fmt.Errorf("Address `%s` may not be "+
					"used as a listener address for both "+
					"RPC servers", addr)
				fmt.Fprintln(os.Stderr, err)
				return nil, nil, err
			}
		}
	}

	// Only allow server TLS to be disabled if the RPC server is bound to
	// localhost addresses.
	if cfg.DisableServerTLS {
		allListeners := append(cfg.LegacyRPCListeners,
			cfg.ExperimentalRPCListeners...)
		for _, addr := range allListeners {
			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 := localhostListeners[host]; !ok {
				str := "%s: the --noservertls 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
			}
		}
	}

	// Expand environment variable and leading ~ for filepaths.
	cfg.CAFile = cleanAndExpandPath(cfg.CAFile)

	// If the btcd username or password are unset, use the same auth as for
	// the client.  The two settings were previously shared for btcd and
	// client auth, so this avoids breaking backwards compatibility while
	// allowing users to use different auth settings for btcd and wallet.
	if cfg.BtcdUsername == "" {
		cfg.BtcdUsername = cfg.Username
	}
	if cfg.BtcdPassword == "" {
		cfg.BtcdPassword = cfg.Password
	}

	return &cfg, remainingArgs, nil
}