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config.go
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config.go
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// Copyright (c) 2013-2015 The btcsuite developers
// Copyright (c) 2015-2017 The Decred developers
// Copyright (c) 2018-2020 The Hcd developers
// Use of this source code is governed by an ISC
// license that can be found in the LICENSE file.
package main
import (
"fmt"
"io/ioutil"
"net"
"os"
"path/filepath"
"regexp"
"strings"
"github.com/coolsnady/hcd/dcrjson"
"github.com/coolsnady/hcutil"
flags "github.com/jessevdk/go-flags"
)
const (
// unusableFlags are the command usage flags which this utility are not
// able to use. In particular it doesn't support websockets and
// consequently notifications.
unusableFlags = dcrjson.UFWebsocketOnly | dcrjson.UFNotification
)
var (
dcrdHomeDir = hcutil.AppDataDir("hcd", false)
hcctlHomeDir = hcutil.AppDataDir("hcctl", false)
dcrwalletHomeDir = hcutil.AppDataDir("hcwallet", false)
defaultConfigFile = filepath.Join(hcctlHomeDir, "hcctl.conf")
defaultRPCServer = "localhost"
defaultWalletRPCServer = "localhost"
defaultRPCCertFile = filepath.Join(dcrdHomeDir, "rpc.cert")
defaultWalletCertFile = filepath.Join(dcrwalletHomeDir, "rpc.cert")
)
// listCommands categorizes and lists all of the usable commands along with
// their one-line usage.
func listCommands() {
const (
categoryChain uint8 = iota
categoryWallet
numCategories
)
// Get a list of registered commands and categorize and filter them.
cmdMethods := dcrjson.RegisteredCmdMethods()
categorized := make([][]string, numCategories)
for _, method := range cmdMethods {
flags, err := dcrjson.MethodUsageFlags(method)
if err != nil {
// This should never happen since the method was just
// returned from the package, but be safe.
continue
}
// Skip the commands that aren't usable from this utility.
if flags&unusableFlags != 0 {
continue
}
usage, err := dcrjson.MethodUsageText(method)
if err != nil {
// This should never happen since the method was just
// returned from the package, but be safe.
continue
}
// Categorize the command based on the usage flags.
category := categoryChain
if flags&dcrjson.UFWalletOnly != 0 {
category = categoryWallet
}
categorized[category] = append(categorized[category], usage)
}
// Display the command according to their categories.
categoryTitles := make([]string, numCategories)
categoryTitles[categoryChain] = "Chain Server Commands:"
categoryTitles[categoryWallet] = "Wallet Server Commands (--wallet):"
for category := uint8(0); category < numCategories; category++ {
fmt.Println(categoryTitles[category])
for _, usage := range categorized[category] {
fmt.Println(usage)
}
fmt.Println()
}
}
// config defines the configuration options for hcctl.
//
// See loadConfig for details on the configuration load process.
type config struct {
ShowVersion bool `short:"V" long:"version" description:"Display version information and exit"`
ListCommands bool `short:"l" long:"listcommands" description:"List all of the supported commands and exit"`
ConfigFile string `short:"C" long:"configfile" description:"Path to configuration file"`
RPCUser string `short:"u" long:"rpcuser" description:"RPC username"`
RPCPassword string `short:"P" long:"rpcpass" default-mask:"-" description:"RPC password"`
RPCServer string `short:"s" long:"rpcserver" description:"RPC server to connect to"`
WalletRPCServer string `short:"w" long:"walletrpcserver" description:"Wallet RPC server to connect to"`
RPCCert string `short:"c" long:"rpccert" description:"RPC server certificate chain for validation"`
PrintJSON bool `short:"j" long:"json" description:"Print json messages sent and received"`
NoTLS bool `long:"notls" description:"Disable TLS"`
Proxy string `long:"proxy" description:"Connect via SOCKS5 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"`
TestNet bool `long:"testnet" description:"Connect to testnet"`
SimNet bool `long:"simnet" description:"Connect to the simulation test network"`
TLSSkipVerify bool `long:"skipverify" description:"Do not verify tls certificates (not recommended!)"`
Wallet bool `long:"wallet" description:"Connect to wallet"`
}
// normalizeAddress returns addr with the passed default port appended if
// there is not already a port specified.
func normalizeAddress(addr string, useTestNet, useSimNet, useWallet bool) string {
_, _, err := net.SplitHostPort(addr)
if err != nil {
var defaultPort string
switch {
case useTestNet:
if useWallet {
defaultPort = "12010"
} else {
defaultPort = "12009"
}
case useSimNet:
if useWallet {
defaultPort = "13010"
} else {
defaultPort = "13009"
}
default:
if useWallet {
defaultPort = "14010"
} else {
defaultPort = "14009"
}
}
return net.JoinHostPort(addr, defaultPort)
}
return addr
}
// cleanAndExpandPath expands environement 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(hcctlHomeDir)
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))
}
// 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
}
// 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 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,
RPCServer: defaultRPCServer,
RPCCert: defaultRPCCertFile,
WalletRPCServer: defaultWalletRPCServer,
}
// Pre-parse the command line options to see if an alternative config
// file, the version flag, or the list commands 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 := flags.NewParser(&preCfg, flags.HelpFlag)
_, err := preParser.Parse()
if err != nil {
if e, ok := err.(*flags.Error); ok && e.Type != flags.ErrHelp {
fmt.Fprintln(os.Stderr, err)
fmt.Fprintln(os.Stderr, "")
fmt.Fprintln(os.Stderr, "The special parameter `-` "+
"indicates that a parameter should be read "+
"from the\nnext unread line from standard input.")
os.Exit(1)
} else if ok && e.Type == flags.ErrHelp {
fmt.Fprintln(os.Stdout, err)
fmt.Fprintln(os.Stdout, "")
fmt.Fprintln(os.Stdout, "The special parameter `-` "+
"indicates that a parameter should be read "+
"from the\nnext unread line from standard input.")
os.Exit(0)
}
}
// 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 options", appName)
if preCfg.ShowVersion {
fmt.Println(appName, "version", version())
os.Exit(0)
}
// Show the available commands and exit if the associated flag was
// specified.
if preCfg.ListCommands {
listCommands()
os.Exit(0)
}
if !fileExists(preCfg.ConfigFile) {
err := createDefaultConfigFile(preCfg.ConfigFile)
if err != nil {
fmt.Fprintf(os.Stderr, "Error creating a default config file: %v\n", err)
}
}
// Load additional config from file.
parser := flags.NewParser(&cfg, flags.Default)
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
}
}
// 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
}
// Multiple networks can't be selected simultaneously.
numNets := 0
if cfg.TestNet {
numNets++
}
if cfg.SimNet {
numNets++
}
if numNets > 1 {
str := "%s: the testnet and simnet params can't be used " +
"together -- choose one of the two"
err := fmt.Errorf(str, "loadConfig")
fmt.Fprintln(os.Stderr, err)
return nil, nil, err
}
// Override the RPC certificate if the --wallet flag was specified and
// the user did not specify one.
if cfg.Wallet && cfg.RPCCert == defaultRPCCertFile {
cfg.RPCCert = defaultWalletCertFile
}
// When the --wallet flag is specified, use the walletrpcserver port
// if specified.
if cfg.Wallet && cfg.WalletRPCServer != defaultWalletRPCServer {
cfg.RPCServer = cfg.WalletRPCServer
}
// Handle environment variable expansion in the RPC certificate path.
cfg.RPCCert = cleanAndExpandPath(cfg.RPCCert)
// Add default port to RPC server based on --testnet and --wallet flags
// if needed.
cfg.RPCServer = normalizeAddress(cfg.RPCServer, cfg.TestNet,
cfg.SimNet, cfg.Wallet)
return &cfg, remainingArgs, nil
}
// createDefaultConfig creates a basic config file at the given destination path.
// For this it tries to read the hcd config file at its default path, and extract
// the RPC user and password from it.
func createDefaultConfigFile(destinationPath string) error {
// Nothing to do when there is no existing hcd conf file at the default
// path to extract the details from.
dcrdConfigPath := filepath.Join(dcrdHomeDir, "hcd.conf")
if !fileExists(dcrdConfigPath) {
return nil
}
// Read hcd.conf from its default path
dcrdConfigFile, err := os.Open(dcrdConfigPath)
if err != nil {
return err
}
defer dcrdConfigFile.Close()
content, err := ioutil.ReadAll(dcrdConfigFile)
if err != nil {
return err
}
// Extract the rpcuser
rpcUserRegexp, err := regexp.Compile(`(?m)^\s*rpcuser=([^\s]+)`)
if err != nil {
return err
}
userSubmatches := rpcUserRegexp.FindSubmatch(content)
if userSubmatches == nil {
// No user found, nothing to do
return nil
}
// Extract the rpcpass
rpcPassRegexp, err := regexp.Compile(`(?m)^\s*rpcpass=([^\s]+)`)
if err != nil {
return err
}
passSubmatches := rpcPassRegexp.FindSubmatch(content)
if passSubmatches == nil {
// No password found, nothing to do
return nil
}
// Create the destination directory if it does not exists
err = os.MkdirAll(filepath.Dir(destinationPath), 0700)
if err != nil {
return err
}
// Create the destination file and write the rpcuser and rpcpass to it
dest, err := os.OpenFile(destinationPath,
os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0600)
if err != nil {
return err
}
defer dest.Close()
dest.WriteString(fmt.Sprintf("rpcuser=%s\nrpcpass=%s",
string(userSubmatches[1]), string(passSubmatches[1])))
return nil
}