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lampshade_impl.go
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/
lampshade_impl.go
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package chained
import (
"context"
"crypto/rsa"
"fmt"
"net"
"runtime"
"time"
buffers "github.com/getlantern/flashlight/v7/buffers"
ops "github.com/getlantern/flashlight/v7/ops"
"github.com/getlantern/common/config"
"github.com/getlantern/errors"
"github.com/getlantern/keyman"
"github.com/getlantern/lampshade"
"github.com/getlantern/netx"
)
type lampshadeImpl struct {
nopCloser
reportDialCore reportDialCoreFn
name string
addr string
dialer lampshade.Dialer
setOp func(op *ops.Op)
}
func newLampshadeImpl(name, addr string, pc *config.ProxyConfig, reportDialCore reportDialCoreFn) (proxyImpl, error) {
cert, err := keyman.LoadCertificateFromPEMBytes([]byte(pc.Cert))
if err != nil {
return nil, log.Error(errors.Wrap(err).With("addr", addr))
}
rsaPublicKey, ok := cert.X509().PublicKey.(*rsa.PublicKey)
if !ok {
return nil, errors.New("Public key is not an RSA public key!")
}
cipherCode := lampshade.Cipher(ptSettingInt(pc, fmt.Sprintf("cipher_%v", runtime.GOARCH)))
if cipherCode == 0 {
if runtime.GOARCH == "amd64" {
// On 64-bit Intel, default to AES128_GCM which is hardware accelerated
cipherCode = lampshade.AES128GCM
} else {
// default to ChaCha20Poly1305 which is fast even without hardware acceleration
cipherCode = lampshade.ChaCha20Poly1305
}
}
windowSize := ptSettingInt(pc, "windowsize")
maxPadding := ptSettingInt(pc, "maxpadding")
maxStreamsPerConn := uint16(ptSettingInt(pc, "streams"))
idleInterval, parseErr := time.ParseDuration(ptSetting(pc, "idleinterval"))
if parseErr != nil || idleInterval < 0 {
// This should be less than the server's IdleTimeout to avoid trying to use
// a connection that was just idled. The client's IdleTimeout is already set
// appropriately for this purpose, so use that.
idleInterval = IdleTimeout
log.Debugf("%s: defaulted idleinterval to %v", name, idleInterval)
}
pingInterval, parseErr := time.ParseDuration(ptSetting(pc, "pinginterval"))
if parseErr != nil || pingInterval < 0 {
pingInterval = 15 * time.Second
log.Debugf("%s: defaulted pinginterval to %v", name, pingInterval)
}
maxLiveConns := ptSettingInt(pc, "maxliveconns")
if maxLiveConns <= 0 {
maxLiveConns = 5
log.Debugf("%s: defaulted maxliveconns to %v", name, maxLiveConns)
}
redialSessionInterval, parseErr := time.ParseDuration(ptSetting(pc, "redialsessioninterval"))
if parseErr != nil || redialSessionInterval < 0 {
redialSessionInterval = 5 * time.Second
log.Debugf("%s: defaulted redialsessioninterval to %v", name, redialSessionInterval)
}
dialer := lampshade.NewDialer(&lampshade.DialerOpts{
WindowSize: windowSize,
MaxPadding: maxPadding,
MaxLiveConns: maxLiveConns,
MaxStreamsPerConn: maxStreamsPerConn,
IdleInterval: idleInterval,
PingInterval: pingInterval,
RedialSessionInterval: redialSessionInterval,
Pool: buffers.Pool,
Cipher: cipherCode,
ServerPublicKey: rsaPublicKey,
})
setOp := func(op *ops.Op) {
op.Set("ls_win", windowSize).
Set("ls_pad", maxPadding).
Set("ls_streams", int(maxStreamsPerConn)).
Set("ls_cipher", cipherCode.String())
}
return &lampshadeImpl{reportDialCore: reportDialCore, name: name, addr: addr, dialer: dialer, setOp: setOp}, nil
}
func (impl *lampshadeImpl) dialServer(op *ops.Op, ctx context.Context) (net.Conn, error) {
impl.setOp(op)
return impl.dialer.DialContext(ctx, func() (net.Conn, error) {
// note - we do not wrap the TCP connection with IdleTiming because
// lampshade cleans up after itself and won't leave excess unused
// connections hanging around.
log.Debugf("Dialing lampshade TCP connection to %v", impl.name)
return impl.reportDialCore(op, func() (net.Conn, error) {
return netx.DialContext(ctx, "tcp", impl.addr)
})
})
}