/
config_listen.go
345 lines (285 loc) · 6.46 KB
/
config_listen.go
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package mainutil
import (
"bytes"
"context"
"crypto/tls"
"encoding/json"
"errors"
"net"
"strings"
"github.com/chronos-tachyon/roxy/internal/constants"
"github.com/chronos-tachyon/roxy/internal/misc"
"github.com/chronos-tachyon/roxy/lib/roxyutil"
)
// ListenConfig represents the configuration for a net.Listener socket with
// optional TLS.
type ListenConfig struct {
Enabled bool
Network string
Address string
TLS TLSServerConfig
}
// ListenConfigJSON represents the JSON doppelgänger of an ListenConfig.
type ListenConfigJSON struct {
Network string `json:"network"`
Address string `json:"address"`
TLS *TLSServerConfigJSON `json:"tls,omitempty"`
}
// AppendTo appends the string representation to the given Builder.
func (cfg ListenConfig) AppendTo(out *strings.Builder) {
out.WriteString(cfg.Address)
if cfg.Network != constants.NetTCP {
out.WriteString(";net=")
out.WriteString(cfg.Network)
}
if cfg.TLS.Enabled {
out.WriteString(";tls=")
cfg.TLS.AppendTo(out)
}
}
// String returns the string representation.
func (cfg ListenConfig) String() string {
if !cfg.Enabled {
return ""
}
var buf strings.Builder
buf.Grow(64)
cfg.AppendTo(&buf)
return buf.String()
}
// MarshalJSON fulfills json.Marshaler.
func (cfg ListenConfig) MarshalJSON() ([]byte, error) {
if !cfg.Enabled {
return constants.NullBytes, nil
}
return json.Marshal(cfg.ToJSON())
}
// ToJSON converts the object to its JSON doppelgänger.
func (cfg ListenConfig) ToJSON() *ListenConfigJSON {
if !cfg.Enabled {
return nil
}
return &ListenConfigJSON{
Network: cfg.Network,
Address: escapeListenAddress(cfg.Address),
TLS: cfg.TLS.ToJSON(),
}
}
// Parse parses the string representation.
func (cfg *ListenConfig) Parse(str string) error {
if cfg == nil {
panic(errors.New("*ListenConfig is nil"))
}
wantZero := true
defer func() {
if wantZero {
*cfg = ListenConfig{}
}
}()
if str == "" || str == constants.NullString {
return nil
}
err := misc.StrictUnmarshalJSON([]byte(str), cfg)
if err == nil {
wantZero = false
return nil
}
cfg.Enabled = true
pieces := strings.Split(str, ";")
cfg.Address = pieces[0]
for _, item := range pieces[1:] {
optName, optValue, optComplete, err := splitOption(item)
if err != nil {
return err
}
optErr := OptionError{
Name: optName,
Value: optValue,
Complete: optComplete,
}
switch optName {
case optionNet:
fallthrough
case optionNetwork:
cfg.Network = optValue
case optionTLS:
err = cfg.TLS.Parse(optValue)
if err != nil {
optErr.Err = err
return optErr
}
default:
optErr.Err = UnknownOptionError{}
return optErr
}
}
err = cfg.PostProcess()
if err != nil {
return err
}
wantZero = false
return nil
}
// UnmarshalJSON fulfills json.Unmarshaler.
func (cfg *ListenConfig) UnmarshalJSON(raw []byte) error {
if cfg == nil {
panic(errors.New("*ListenConfig is nil"))
}
wantZero := true
defer func() {
if wantZero {
*cfg = ListenConfig{}
}
}()
if bytes.Equal(raw, constants.NullBytes) {
return nil
}
var alt *ListenConfigJSON
err := misc.StrictUnmarshalJSON(raw, &alt)
if err != nil {
return err
}
err = cfg.FromJSON(alt)
if err != nil {
return err
}
err = cfg.PostProcess()
if err != nil {
return err
}
wantZero = false
return nil
}
// FromJSON converts the object's JSON doppelgänger into the object.
func (cfg *ListenConfig) FromJSON(alt *ListenConfigJSON) error {
if cfg == nil {
panic(errors.New("*ListenConfig is nil"))
}
if alt == nil {
*cfg = ListenConfig{}
return nil
}
*cfg = ListenConfig{
Enabled: true,
Network: alt.Network,
Address: unescapeListenAddress(alt.Address),
}
err := cfg.TLS.FromJSON(alt.TLS)
if err != nil {
return err
}
return nil
}
// PostProcess performs data integrity checks and input post-processing.
func (cfg *ListenConfig) PostProcess() error {
if cfg == nil {
panic(errors.New("*ListenConfig is nil"))
}
if !cfg.Enabled {
*cfg = ListenConfig{}
return nil
}
err := cfg.TLS.PostProcess()
if err != nil {
return err
}
if cfg.Address == "" {
return roxyutil.StructFieldError{
Field: "ListenConfig.Address",
Value: cfg.Address,
Err: roxyutil.ErrExpectNonEmpty,
}
}
maybeUnix := (cfg.Network == constants.NetEmpty) || constants.IsNetUnix(cfg.Network)
if maybeUnix {
if cfg.Address[0] == '/' || cfg.Address[0] == '\x00' {
if cfg.Network == constants.NetEmpty {
cfg.Network = constants.NetUnix
}
} else if cfg.Address[0] == '@' {
cfg.Address = "\x00" + cfg.Address[1:]
if cfg.Network == constants.NetEmpty {
cfg.Network = constants.NetUnix
}
} else if cfg.Network != constants.NetEmpty || strings.Contains(cfg.Address, "/") {
abs, err := roxyutil.PathAbs(cfg.Address)
if err != nil {
return err
}
cfg.Address = abs
if cfg.Network == constants.NetEmpty {
cfg.Network = constants.NetUnix
}
}
}
if cfg.Network == constants.NetEmpty {
cfg.Network = constants.NetTCP
}
return nil
}
// Listen creates the configured net.Listener.
func (cfg ListenConfig) Listen(ctx context.Context) (net.Listener, error) {
if !cfg.Enabled {
return newDummyListener(), nil
}
tlsConfig, err := cfg.TLS.MakeTLS()
if err != nil {
return nil, err
}
var l net.Listener
l, err = net.Listen(cfg.Network, cfg.Address)
if err != nil {
return nil, err
}
if tlsConfig != nil {
l = tls.NewListener(l, tlsConfig)
}
return l, nil
}
// ListenNoTLS creates the configured net.Listener. TLS handshaking is not
// added automatically.
func (cfg ListenConfig) ListenNoTLS(ctx context.Context) (net.Listener, error) {
if !cfg.Enabled {
return newDummyListener(), nil
}
l, err := net.Listen(cfg.Network, cfg.Address)
if err != nil {
return nil, err
}
return l, nil
}
func escapeListenAddress(addr string) string {
if addr != "" && addr[0] == '\x00' {
return "@" + addr[1:]
}
return addr
}
func unescapeListenAddress(addr string) string {
if addr != "" && addr[0] == '@' {
return "\x00" + addr[1:]
}
return addr
}
// type dummyListener {{{
type dummyListener struct {
ch chan struct{}
}
func newDummyListener() net.Listener {
return dummyListener{ch: make(chan struct{})}
}
func (l dummyListener) Addr() net.Addr {
return &net.TCPAddr{
IP: net.ParseIP("127.0.0.1"),
Port: 0,
}
}
func (l dummyListener) Accept() (net.Conn, error) {
<-l.ch
return nil, net.ErrClosed
}
func (l dummyListener) Close() error {
close(l.ch)
return nil
}
var _ net.Listener = dummyListener{}
// }}}