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run.go
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run.go
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package main
import (
"io"
"log"
"net/http"
"net/url"
"os"
"path/filepath"
"strings"
"sync"
"time"
"github.com/go-compile/localrelay"
"github.com/kardianos/service"
"github.com/naoina/toml"
"github.com/pkg/errors"
"golang.org/x/net/proxy"
)
var (
// activeRelays is a list of relays being ran
activeRelays map[string]*localrelay.Relay
activeRelaysM sync.Mutex
// logDescriptors is a list of relay name to file descriptor
// this is used when shutting down.
logDescriptors map[string]*io.Closer
forkIdentifier = "exec.signal-forked-process-true"
// configDirSuffix is prepended with the user's home dir.
// This is where the relay configs are stored.
configDirSuffix = "localrelay/"
ErrInvalidRelayName = errors.New("invalid relay name")
)
func init() {
activeRelays = make(map[string]*localrelay.Relay, 3)
logDescriptors = make(map[string]*io.Closer, 3)
}
func runRelays(opt *options, i int, cmd []string) error {
home := configSystemDir()
relayPaths := make([]string, 0, len(cmd[i+1:]))
// Read all relay config files and decode them
relays := make([]Relay, 0, len(cmd[i+1:]))
for _, file := range cmd[i+1:] {
// if @ used as prefix grab the file from the user profile's
// config location
if strings.HasPrefix(file, "@") {
file = filepath.Join(home, configDirSuffix, file[1:])
}
file, err := filepath.Abs(file)
if err != nil {
return err
}
relay, err := readRelayConfig(file)
if err != nil {
return err
}
relays = append(relays, *relay)
// append path here so we validate the config first before sending to
// service.
relayPaths = append(relayPaths, file)
}
if len(relays) == 0 {
Println("[WARN] No relay configs provided.")
return nil
}
Printf("Loaded: %d relays\n", len(relays))
// if detach is enable fork process and start daemon
if opt.detach {
if !runningAsRoot() {
Println("Elevated privileges required to run in background.")
return nil
}
running, err := daemonService.Status()
if err != nil {
return errors.Wrap(err, "fetching service status")
}
if running != service.StatusRunning {
Println("[Info] Service not running.")
if err := daemonService.Start(); err != nil {
log.Fatalf("[Error] Failed to start service: %s\n", err)
}
Println("[Info] Service has been started.")
// wait for process to launch
time.Sleep(time.Millisecond * 50)
}
return serviceRun(relayPaths)
}
return launchRelays(relays, true)
}
func launchRelays(relays []Relay, wait bool) error {
// TODO: listen for sigterm signal and softly shutdown
wg := sync.WaitGroup{}
for i := range relays {
r := relays[i]
if !validateName(r.Name) {
return ErrInvalidRelayName
}
Printf("[Info] [Relay:%d] Starting %q on %q\n", i+1, r.Name, r.Host)
if r.Proxy.Host != "" && strings.ToLower(r.Proxy.Protocol) != "socks5" {
Printf("[Warn] Proxy type %q not supported.\n", r.Proxy.Protocol)
return nil
}
w := os.Stdout
if r.Logging != "stdout" {
Printf("[Info] [Relay:%s] Log output writing to: %q\n", r.Name, r.Logging)
f, err := os.OpenFile(r.Logging, os.O_APPEND|os.O_WRONLY|os.O_CREATE, 0644)
if err != nil {
return err
}
addLogDescriptor(f, r.Name)
w = f
}
relay := localrelay.New(r.Name, r.Host, r.Destination, w)
for index, proto := range r.ProtocolSwitch {
if len(proto) == 0 {
continue
}
relay.SetProtocolSwitch(index, proto)
}
switch r.Kind {
case localrelay.ProxyTCP, localrelay.ProxyFailOverTCP, localrelay.ProxyUDP:
// If proxy enabled
if r.Proxy.Host != "" && strings.ToLower(r.Proxy.Protocol) == "socks5" {
auth := &proxy.Auth{
User: r.Proxy.Username,
Password: r.Proxy.Password,
}
// If auth not set make it nil
if r.Proxy.Username == "" {
auth = nil
}
prox, err := proxy.SOCKS5("tcp", r.Proxy.Host, auth, nil)
if err != nil {
panic(err)
}
relay.SetProxy(&prox)
}
if r.Kind == localrelay.ProxyFailOverTCP {
relay.SetFailOverTCP()
relay.DisableProxy(r.ProxyIgnore...)
}
addRelay(relay)
wg.Add(1)
go func(relay *localrelay.Relay) {
if err := relay.ListenServe(); err != nil {
log.Println("[Error] ", err)
}
removeRelay(relay.Name)
removeLogDescriptor(r.Name)
wg.Done()
}(relay)
case localrelay.ProxyHTTP, localrelay.ProxyHTTPS:
// Convert the relay from the default: TCP to a HTTP server
err := relay.SetHTTP(http.Server{
// Middle ware can be set here
Handler: localrelay.HandleHTTP(relay),
ReadTimeout: time.Second * 60,
WriteTimeout: time.Second * 60,
IdleTimeout: time.Second * 120,
})
if err != nil {
panic(err)
}
if relay.ProxyType == localrelay.ProxyHTTPS {
// Set TLS certificates & make relay HTTPS
relay.SetTLS(r.Certificate, r.Key)
}
// If proxy enabled
if r.Proxy.Host != "" && strings.ToLower(r.Proxy.Protocol) == "socks5" {
userinfo := url.UserPassword(r.Proxy.Username, r.Proxy.Password)
prox, err := url.Parse(r.Proxy.Protocol + "://" + r.Proxy.Host)
if err != nil {
panic(err)
}
if len(r.Proxy.Username) != 0 {
prox.User = userinfo
}
relay.SetClient(&http.Client{
Transport: &http.Transport{
Proxy: http.ProxyURL(prox),
},
Timeout: time.Second * 120,
})
}
addRelay(relay)
wg.Add(1)
go func(relay *localrelay.Relay) {
if err := relay.ListenServe(); err != nil {
log.Println("[Error] ", err)
}
removeRelay(relay.Name)
removeLogDescriptor(r.Name)
wg.Done()
}(relay)
}
}
if wait {
wg.Wait()
Println("[Info] All relays closed.")
}
return nil
}
func addRelay(r *localrelay.Relay) {
activeRelaysM.Lock()
activeRelays[r.Name] = r
activeRelaysM.Unlock()
}
func removeRelay(name string) {
activeRelaysM.Lock()
delete(activeRelays, name)
activeRelaysM.Unlock()
}
func addLogDescriptor(c io.Closer, name string) {
activeRelaysM.Lock()
logDescriptors[name] = &c
activeRelaysM.Unlock()
}
func removeLogDescriptor(name string) {
activeRelaysM.Lock()
delete(logDescriptors, name)
activeRelaysM.Unlock()
}
func closeLogDescriptors() {
activeRelaysM.Lock()
for _, c := range logDescriptors {
closer := *c
closer.Close()
}
activeRelaysM.Unlock()
}
func isRunning(relay string) bool {
activeRelaysM.Lock()
defer activeRelaysM.Unlock()
_, found := activeRelays[relay]
return found
}
func runningRelays() []*localrelay.Relay {
activeRelaysM.Lock()
relays := make([]*localrelay.Relay, 0, len(activeRelays))
for _, r := range activeRelays {
relays = append(relays, r)
}
activeRelaysM.Unlock()
return relays
}
func closeDescriptor(path string) error {
activeRelaysM.Lock()
defer activeRelaysM.Unlock()
closer := *logDescriptors[path]
return closer.Close()
}
// runningRelaysCopy makes a copy instead of returning the
// pointers
func runningRelaysCopy() []localrelay.Relay {
activeRelaysM.Lock()
relays := make([]localrelay.Relay, 0, len(activeRelays))
for _, r := range activeRelays {
relays = append(relays, *r)
}
activeRelaysM.Unlock()
return relays
}
func readRelayConfig(file string) (*Relay, error) {
f, err := os.Open(file)
if err != nil {
return nil, errors.Wrapf(err, "file:%q", file)
}
defer f.Close()
var relay Relay
if err := toml.NewDecoder(f).Decode(&relay); err != nil {
return nil, errors.Wrapf(err, "file:%q", file)
}
return &relay, nil
}