/
client.go
255 lines (217 loc) · 5.54 KB
/
client.go
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package client
import (
"bytes"
"crypto/rand"
"encoding/base64"
"errors"
"github.com/flynn/noise"
"github.com/jc-lab/sipc/go/sipc_error"
"github.com/jc-lab/sipc/go/sipc_proto"
"github.com/jc-lab/sipc/go/transport"
"github.com/jc-lab/sipc/go/util"
"google.golang.org/protobuf/proto"
"io"
"net"
"time"
)
type State int
const (
kStateIdle State = 1 + iota
kStateHandshake
kStateEstablished
kStateClosed
)
type SipcClient struct {
io.ReadWriteCloser
connectInfo sipc_proto.ConnectInfo
HandshakeTimeout time.Duration
localStaticKey noise.DHKey
state State
transport transport.Transport
connection net.Conn
handshakeState *noise.HandshakeState
handshakeCh chan error
csServer *noise.CipherState
csClient *noise.CipherState
readBuffer *bytes.Buffer
}
func NewSipcClient(connectInfo string) (*SipcClient, error) {
return NewSipcClientWithAllowRemote(connectInfo, false)
}
func NewSipcClientWithAllowRemote(connectInfo string, allowRemote bool) (*SipcClient, error) {
client := &SipcClient{
HandshakeTimeout: time.Second * 60,
state: kStateIdle,
readBuffer: bytes.NewBuffer(make([]byte, 1024)),
}
localStaticKey, err := noise.DH25519.GenerateKeypair(rand.Reader)
if err != nil {
return nil, err
}
client.localStaticKey = localStaticKey
connectInfoBinary, err := base64.URLEncoding.DecodeString(connectInfo)
if err != nil {
return nil, err
}
err = proto.Unmarshal(connectInfoBinary, &client.connectInfo)
if err != nil {
return nil, err
}
if client.connectInfo.TransportType == sipc_proto.TransportType_kTcp {
if !allowRemote {
return nil, errors.New("remote connection not allowed")
}
}
return client, nil
}
func (client *SipcClient) IsConnected() bool {
return client.state == kStateEstablished
}
func (client *SipcClient) IsClosed() bool {
return client.state == kStateClosed
}
func (client *SipcClient) Start() error {
var err error
if client.transport == nil {
var t transport.Transport
if client.connectInfo.TransportType == sipc_proto.TransportType_kTcp {
t = transport.NewTcpTransport()
} else {
t, err = transport.NewTransport(client.connectInfo.TransportType)
if err != nil {
return err
}
}
client.transport = t
}
client.handshakeCh = make(chan error, 1)
conn, err := client.transport.Connect(client.connectInfo.TransportAddress)
if err != nil {
return err
}
client.state = kStateHandshake
client.connection = conn
cs := noise.NewCipherSuite(noise.DH25519, noise.CipherChaChaPoly, noise.HashSHA256)
//localKeyPair, err := cs.GenerateKeypair(rand.Reader)
//if err != nil {
// return err
//}
handshakeState, err := noise.NewHandshakeState(noise.Config{
CipherSuite: cs,
Random: rand.Reader,
Pattern: noise.HandshakeXK,
Initiator: true,
StaticKeypair: client.localStaticKey,
PeerStatic: client.connectInfo.PublicKey,
})
if err != nil {
return err
}
client.handshakeState = handshakeState
clientHello := &sipc_proto.ClientHelloPayload{
ConnectionId: client.connectInfo.ConnectionId,
}
handshakeResultCheck := func(payload []byte, cs1 *noise.CipherState, cs2 *noise.CipherState, err error) ([]byte, int) {
if err != nil {
client.handshakeCh <- err
return nil, -1
}
if cs1 != nil || cs2 != nil {
client.csServer = cs2
client.csClient = cs1
client.state = kStateEstablished
client.readBuffer.Reset()
client.handshakeCh <- nil
return payload, 1
}
return payload, 0
}
go func() {
writeBuf, err := proto.Marshal(clientHello)
if err != nil {
client.handshakeCh <- err
return
}
for {
payload, cs1, cs2, err := handshakeState.WriteMessage(nil, writeBuf)
writeBuf = nil
if err == nil && payload != nil {
err = util.WritePacket(conn, payload)
}
payload, complete := handshakeResultCheck(payload, cs1, cs2, err)
if complete != 0 {
break
}
readBuf, err := util.ReadPacket(conn)
if err != nil {
client.handshakeCh <- err
break
}
if len(readBuf) <= 0 {
client.handshakeCh <- errors.New("connection closed")
break
}
payload, complete = handshakeResultCheck(handshakeState.ReadMessage(nil, readBuf))
if complete != 0 {
break
}
}
}()
select {
case res := <-client.handshakeCh:
return res
case <-time.After(client.HandshakeTimeout):
return sipc_error.HANDSHAKE_TIMEOUT
}
}
func (client *SipcClient) Read(p []byte) (int, error) {
if client.state != kStateEstablished {
return -1, sipc_error.NOT_CONNECTED
}
n, err := util.BufferedRead(client.readBuffer, p, func() ([]byte, error) {
buf, err := util.ReadPacket(client.connection)
if err != nil {
return nil, err
}
return client.csServer.Decrypt(nil, nil, buf)
})
if err != nil {
client.onInactive(err)
}
return n, err
}
func (client *SipcClient) Write(p []byte) (n int, err error) {
if client.state != kStateEstablished {
return -1, sipc_error.NOT_CONNECTED
}
ct, err := client.csClient.Encrypt(nil, nil, p)
if err != nil {
return 0, err
}
err = util.WritePacket(client.connection, ct)
if err != nil {
return 0, err
}
return len(p), nil
}
func (client *SipcClient) closeObject() {
client.state = kStateClosed
}
func (client *SipcClient) Close() error {
if client.state != kStateEstablished {
return sipc_error.NOT_CONNECTED
}
client.closeObject()
return client.connection.Close()
}
func (client *SipcClient) onInactive(cause error) {
client.connection = nil
client.csServer = nil
client.csClient = nil
if client.connectInfo.AllowReconnect {
client.state = kStateIdle
_ = client.Start()
} else {
client.closeObject()
}
}