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controlsvc.go
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controlsvc.go
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//go:build !no_controlsvc
// +build !no_controlsvc
package controlsvc
import (
"context"
"crypto/tls"
"encoding/json"
"fmt"
"io"
"io/fs"
"net"
"os"
"reflect"
"runtime"
"strings"
"sync"
"time"
"github.com/ansible/receptor/pkg/logger"
"github.com/ansible/receptor/pkg/netceptor"
"github.com/ansible/receptor/pkg/utils"
"github.com/ghjm/cmdline"
)
const (
normalCloseError = "normal close"
writeControlServiceError = "Write error in control service"
)
type Copier interface {
Copy(dst io.Writer, src io.Reader) (written int64, err error)
}
type SocketConnIO struct{}
func (s *SocketConnIO) Copy(dst io.Writer, src io.Reader) (written int64, err error) {
return io.Copy(dst, src)
}
type NetceptorForControlsvc interface {
ListenAndAdvertise(service string, tlscfg *tls.Config, tags map[string]string) (*netceptor.Listener, error)
NetceptorForControlCommand
}
type Utiler interface {
BridgeConns(c1 io.ReadWriteCloser, c1Name string, c2 io.ReadWriteCloser, c2Name string, logger *logger.ReceptorLogger)
UnixSocketListen(filename string, permissions fs.FileMode) (net.Listener, *utils.FLock, error)
}
type Util struct{}
func (u *Util) BridgeConns(c1 io.ReadWriteCloser, c1Name string, c2 io.ReadWriteCloser, c2Name string, logger *logger.ReceptorLogger) {
utils.BridgeConns(c1, c1Name, c2, c2Name, logger)
}
func (u *Util) UnixSocketListen(filename string, permissions fs.FileMode) (net.Listener, *utils.FLock, error) {
return utils.UnixSocketListen(filename, permissions)
}
type Neter interface {
Listen(network string, address string) (net.Listener, error)
}
type Net struct{}
func (n *Net) Listen(network string, address string) (net.Listener, error) {
return net.Listen(network, address)
}
type Tlser interface {
NewListener(inner net.Listener, config *tls.Config) net.Listener
}
type TLS struct{}
func (t *TLS) NewListener(inner net.Listener, config *tls.Config) net.Listener {
return tls.NewListener(inner, config)
}
// SockControl implements the ControlFuncOperations interface that is passed back to control functions.
type SockControl struct {
conn net.Conn
}
func NewSockControl(conn net.Conn) *SockControl {
return &SockControl{
conn: conn,
}
}
func (s *SockControl) RemoteAddr() net.Addr {
return s.conn.RemoteAddr()
}
// WriteMessage attempts to write a message to a connection.
func (s *SockControl) WriteMessage(message string) error {
if message != "" {
_, err := s.conn.Write([]byte(message))
if err != nil {
return err
}
}
return nil
}
// BridgeConn bridges the socket to another socket.
func (s *SockControl) BridgeConn(message string, bc io.ReadWriteCloser, bcName string, logger *logger.ReceptorLogger, utils Utiler) error {
if err := s.WriteMessage(message); err != nil {
return err
}
utils.BridgeConns(s.conn, "control service", bc, bcName, logger)
return nil
}
// ReadFromConn copies from the socket to an io.Writer, until EOF.
func (s *SockControl) ReadFromConn(message string, out io.Writer, io Copier) error {
if err := s.WriteMessage(message); err != nil {
return err
}
if _, err := io.Copy(out, s.conn); err != nil {
return err
}
return nil
}
// WriteToConn writes an initial string, and then messages to a channel, to the connection.
func (s *SockControl) WriteToConn(message string, in chan []byte) error {
if err := s.WriteMessage(message); err != nil {
return err
}
for bytes := range in {
_, err := s.conn.Write(bytes)
if err != nil {
return err
}
}
return nil
}
func (s *SockControl) Close() error {
return s.conn.Close()
}
// Server is an instance of a control service.
type Server struct {
nc NetceptorForControlsvc
controlFuncLock sync.RWMutex
controlTypes map[string]ControlCommandType
serverUtils Utiler
serverNet Neter
serverTLS Tlser
}
// New returns a new instance of a control service.
func New(stdServices bool, nc NetceptorForControlsvc) *Server {
s := &Server{
nc: nc,
controlFuncLock: sync.RWMutex{},
controlTypes: make(map[string]ControlCommandType),
serverUtils: &Util{},
serverNet: &Net{},
serverTLS: &TLS{},
}
if stdServices {
s.controlTypes["ping"] = &PingCommandType{}
s.controlTypes["status"] = &StatusCommandType{}
s.controlTypes["connect"] = &ConnectCommandType{}
s.controlTypes["traceroute"] = &TracerouteCommandType{}
s.controlTypes["reload"] = &ReloadCommandType{}
}
return s
}
func (s *Server) SetServerUtils(u Utiler) {
s.serverUtils = u
}
func (s *Server) SetServerNet(n Neter) {
s.serverNet = n
}
func (s *Server) SetServerTLS(t Tlser) {
s.serverTLS = t
}
// MainInstance is the global instance of the control service instantiated by the command-line main() function.
var MainInstance *Server
// AddControlFunc registers a function that can be used from a control socket.
func (s *Server) AddControlFunc(name string, cType ControlCommandType) error {
s.controlFuncLock.Lock()
defer s.controlFuncLock.Unlock()
if _, ok := s.controlTypes[name]; ok {
return fmt.Errorf("control function named %s already exists", name)
}
s.controlTypes[name] = cType
return nil
}
func errorNormal(nc NetceptorForControlsvc, logMessage string, err error) bool {
if err == nil {
return false
}
if !strings.HasSuffix(err.Error(), normalCloseError) {
nc.GetLogger().Error("%s: %s\n", logMessage, err)
}
return true
}
func writeToConnWithLog(conn net.Conn, nc NetceptorForControlsvc, writeMessage string, logMessage string) bool {
_, err := conn.Write([]byte(writeMessage))
return errorNormal(nc, logMessage, err)
}
// RunControlSession runs the server protocol on the given connection.
func (s *Server) RunControlSession(conn net.Conn) {
s.nc.GetLogger().Debug("Client connected to control service %s\n", conn.RemoteAddr().String())
defer func() {
s.nc.GetLogger().Debug("Client disconnected from control service %s\n", conn.RemoteAddr().String())
if conn != nil {
err := conn.Close()
if err != nil {
s.nc.GetLogger().Warning("Could not close connection: %s\n", err)
}
}
}()
writeMsg := fmt.Sprintf("Receptor Control, node %s\n", s.nc.NodeID())
logMsg := "Could not write in control service"
if writeToConnWithLog(conn, s.nc, writeMsg, logMsg) {
return
}
done := false
for !done {
// Inefficiently read one line from the socket - we can't use bufio
// because we cannot read ahead beyond the newline character
cmdBytes := make([]byte, 0)
buf := make([]byte, 1)
for {
n, err := conn.Read(buf)
if err == io.EOF {
s.nc.GetLogger().Debug("Control service closed\n")
done = true
break
} else if err != nil {
if !strings.HasSuffix(err.Error(), normalCloseError) {
s.nc.GetLogger().Warning("Could not read in control service: %s\n", err)
}
return
}
if n == 1 {
if buf[0] == '\r' {
continue
} else if buf[0] == '\n' {
break
}
cmdBytes = append(cmdBytes, buf[0])
}
}
if len(cmdBytes) == 0 {
continue
}
var cmd string
var params string
var jsonData map[string]interface{}
if cmdBytes[0] == '{' {
err := json.Unmarshal(cmdBytes, &jsonData)
if err == nil {
cmdIf, ok := jsonData["command"]
if ok {
cmd, ok = cmdIf.(string)
if !ok {
err = fmt.Errorf("command must be a string")
}
} else {
err = fmt.Errorf("JSON did not contain a command")
}
}
if err != nil {
writeMsg := fmt.Sprintf("ERROR: %s\n", err)
if writeToConnWithLog(conn, s.nc, writeMsg, writeControlServiceError) {
return
}
}
} else {
tokens := strings.SplitN(string(cmdBytes), " ", 2)
if len(tokens) > 0 {
cmd = strings.ToLower(tokens[0])
if len(tokens) > 1 {
params = tokens[1]
}
}
}
s.controlFuncLock.RLock()
var ct ControlCommandType
for f := range s.controlTypes {
if f == cmd {
ct = s.controlTypes[f]
break
}
}
s.controlFuncLock.RUnlock()
if ct != nil {
cfo := NewSockControl(conn)
var cfr map[string]interface{}
var cc ControlCommand
var err error
if jsonData == nil {
cc, err = ct.InitFromString(params)
} else {
cc, err = ct.InitFromJSON(jsonData)
}
if err == nil {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
cfr, err = cc.ControlFunc(ctx, s.nc, cfo)
}
if err != nil {
errorNormal(s.nc, "", err)
writeMsg := fmt.Sprintf("ERROR: %s\n", err)
if writeToConnWithLog(conn, s.nc, writeMsg, writeControlServiceError) {
return
}
} else if cfr != nil {
rbytes, err := json.Marshal(cfr)
if err != nil {
writeMsg := fmt.Sprintf("ERROR: could not convert response to JSON: %s\n", err)
if writeToConnWithLog(conn, s.nc, writeMsg, writeControlServiceError) {
return
}
}
rbytes = append(rbytes, '\n')
writeMsg := string(rbytes)
if writeToConnWithLog(conn, s.nc, writeMsg, writeControlServiceError) {
return
}
}
} else {
writeMsg := "ERROR: Unknown command\n"
if writeToConnWithLog(conn, s.nc, writeMsg, writeControlServiceError) {
return
}
}
}
}
func (s *Server) ConnectionListener(ctx context.Context, listener net.Listener) {
for {
if ctx.Err() != nil {
return
}
conn, err := listener.Accept()
if err != nil {
if !strings.HasSuffix(err.Error(), normalCloseError) {
s.nc.GetLogger().Error("Error accepting connection: %s\n", err)
}
continue
}
go s.SetupConnection(conn)
}
}
func (s *Server) SetupConnection(conn net.Conn) {
defer conn.Close()
tlsConn, ok := conn.(*tls.Conn)
if ok {
// Explicitly run server TLS handshake so we can deal with timeout and errors here
err := conn.SetDeadline(time.Now().Add(10 * time.Second))
if err != nil {
s.nc.GetLogger().Error("Error setting timeout: %s. Closing socket.\n", err)
return
}
err = tlsConn.Handshake()
if err != nil {
s.nc.GetLogger().Error("TLS handshake error: %s. Closing socket.\n", err)
return
}
err = conn.SetDeadline(time.Time{})
if err != nil {
s.nc.GetLogger().Error("Error clearing timeout: %s. Closing socket.\n", err)
return
}
}
s.RunControlSession(conn)
}
// RunControlSvc runs the main accept loop of the control service.
func (s *Server) RunControlSvc(ctx context.Context, service string, tlscfg *tls.Config,
unixSocket string, unixSocketPermissions os.FileMode, tcpListen string, tcptls *tls.Config,
) error {
var uli net.Listener
var lock *utils.FLock
var err error
if unixSocket != "" {
uli, lock, err = s.serverUtils.UnixSocketListen(unixSocket, unixSocketPermissions)
if err != nil {
return fmt.Errorf("error opening Unix socket: %s", err)
}
} else {
uli = nil
}
var tli net.Listener
if tcpListen != "" {
var listenAddr string
if strings.Contains(tcpListen, ":") {
listenAddr = tcpListen
} else {
listenAddr = fmt.Sprintf("0.0.0.0:%s", tcpListen)
}
tli, err = s.serverNet.Listen("tcp", listenAddr)
if err != nil {
return fmt.Errorf("error listening on TCP socket: %s", err)
}
if tcptls != nil {
tli = s.serverTLS.NewListener(tli, tcptls)
}
} else {
tli = nil
}
var li *netceptor.Listener
if service != "" {
li, err = s.nc.ListenAndAdvertise(service, tlscfg, map[string]string{
"type": "Control Service",
})
if err != nil {
return fmt.Errorf("error opening Unix socket: %s", err)
}
} else {
li = nil
}
if uli == nil && tli == nil && li == nil {
return fmt.Errorf("no listeners specified")
}
s.nc.GetLogger().Info("Running control service %s\n", service)
go func() {
<-ctx.Done()
if uli != nil {
_ = uli.Close()
_ = lock.Unlock()
}
if li != nil {
_ = li.Close()
}
if tli != nil {
_ = tli.Close()
}
}()
for _, listener := range []net.Listener{uli, tli, li} {
if listener == nil || reflect.ValueOf(listener).IsNil() {
continue
}
go s.ConnectionListener(ctx, listener)
}
return nil
}
// **************************************************************************
// Command line
// **************************************************************************
// cmdlineConfigWindows is the cmdline configuration object for a control service on Windows.
type cmdlineConfigWindows struct {
Service string `description:"Receptor service name to listen on" default:"control"`
TLS string `description:"Name of TLS server config for the Receptor listener"`
TCPListen string `description:"Local TCP port or host:port to bind to the control service"`
TCPTLS string `description:"Name of TLS server config for the TCP listener"`
}
// cmdlineConfigUnix is the cmdline configuration object for a control service on Unix.
type cmdlineConfigUnix struct {
Service string `description:"Receptor service name to listen on" default:"control"`
Filename string `description:"Specifies the filename of a local Unix socket to bind to the service."`
Permissions int `description:"Socket file permissions" default:"0600"`
TLS string `description:"Name of TLS server config for the Receptor listener"`
TCPListen string `description:"Local TCP port or host:port to bind to the control service"`
TCPTLS string `description:"Name of TLS server config for the TCP listener"`
}
// Run runs the action.
func (cfg cmdlineConfigUnix) Run() error {
if cfg.TLS != "" && cfg.TCPListen != "" && cfg.TCPTLS == "" {
netceptor.MainInstance.Logger.Warning("Control service %s has TLS configured on the Receptor listener but not the TCP listener.", cfg.Service)
}
tlscfg, err := netceptor.MainInstance.GetServerTLSConfig(cfg.TLS)
if err != nil {
return err
}
var tcptls *tls.Config
if cfg.TCPListen != "" {
tcptls, err = netceptor.MainInstance.GetServerTLSConfig(cfg.TCPTLS)
if err != nil {
return err
}
}
err = MainInstance.RunControlSvc(context.Background(), cfg.Service, tlscfg, cfg.Filename,
os.FileMode(cfg.Permissions), cfg.TCPListen, tcptls)
if err != nil {
return err
}
return nil
}
// Run runs the action.
func (cfg cmdlineConfigWindows) Run() error {
return cmdlineConfigUnix{
Service: cfg.Service,
TLS: cfg.TLS,
TCPListen: cfg.TCPListen,
TCPTLS: cfg.TCPTLS,
}.Run()
}
func init() {
if runtime.GOOS == "windows" {
cmdline.RegisterConfigTypeForApp("receptor-control-service",
"control-service", "Runs a control service", cmdlineConfigWindows{})
} else {
cmdline.RegisterConfigTypeForApp("receptor-control-service",
"control-service", "Runs a control service", cmdlineConfigUnix{})
}
}