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shadowsocks.go
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shadowsocks.go
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package shadowsocks
import (
"bytes"
"context"
"fmt"
"io"
"net"
"time"
"github.com/daeuniverse/softwind/ciphers"
"github.com/daeuniverse/softwind/common"
"github.com/daeuniverse/softwind/netproxy"
"github.com/daeuniverse/softwind/protocol"
"github.com/daeuniverse/softwind/protocol/direct"
ss "github.com/daeuniverse/softwind/protocol/shadowsocks"
"github.com/e14914c0-6759-480d-be89-66b7b7676451/SweetLisa/manager"
"github.com/e14914c0-6759-480d-be89-66b7b7676451/SweetLisa/model"
"github.com/e14914c0-6759-480d-be89-66b7b7676451/SweetLisa/pkg/log"
jsoniter "github.com/json-iterator/go"
)
func init() {
manager.Register(string(protocol.ProtocolShadowsocks), New)
}
type Shadowsocks struct {
dialer manager.Dialer
arg manager.ManageArgument
masterKey []byte
cipherConf *ciphers.CipherConf
}
func New(dialer manager.Dialer, arg manager.ManageArgument) (manager.Manager, error) {
cipherConf := ciphers.AeadCiphersConf[arg.Argument.Method]
masterKey := common.EVPBytesToKey(arg.Argument.Password, cipherConf.KeyLen)
return &Shadowsocks{
dialer: dialer,
arg: arg,
masterKey: masterKey,
cipherConf: cipherConf,
}, nil
}
func (s *Shadowsocks) GetTurn(ctx context.Context, cmd protocol.MetadataCmd, body []byte) (respBody *manager.ReaderCloser, err error) {
if len(body) >= 1<<17 {
log.Trace("GetTurn(ss): to: %v, len(body): %v", net.JoinHostPort(s.arg.Host, s.arg.Port), len(body))
}
dialer := s.dialer
if dialer == nil {
dialer = &netproxy.ContextDialerConverter{
Dialer: direct.SymmetricDirect,
}
}
conn, err := dialer.DialContext(ctx, "tcp", net.JoinHostPort(s.arg.Host, s.arg.Port))
if err != nil {
return nil, err
}
crw, err := ss.NewTCPConn(conn, protocol.Metadata{
Type: protocol.MetadataTypeMsg,
Cmd: cmd,
Cipher: s.arg.Argument.Method,
IsClient: true,
}, s.masterKey, nil)
if err != nil {
conn.Close()
return nil, err
}
go func() {
<-ctx.Done()
crw.SetDeadline(time.Now())
}()
if _, err = crw.Write(body); err != nil {
crw.Close()
return nil, err
}
metadata, err := crw.ReadMetadata()
if err != nil {
crw.Close()
return nil, err
}
return &manager.ReaderCloser{Reader: io.LimitReader(crw, int64(metadata.LenMsgBody)), Closer: crw}, nil
}
func (s *Shadowsocks) Ping(ctx context.Context) (resp *model.PingResp, err error) {
respBody, err := s.GetTurn(ctx, protocol.MetadataCmdPing, []byte("ping"))
if err != nil {
return nil, err
}
defer respBody.Closer.Close()
var r model.PingResp
if err = jsoniter.NewDecoder(respBody.Reader).Decode(&r); err != nil {
return nil, err
}
return &r, nil
}
func (s *Shadowsocks) SyncPassages(ctx context.Context, passages []model.Passage) (err error) {
body, err := jsoniter.Marshal(passages)
if err != nil {
return err
}
log.Trace("SyncPassages: to: %v, len(body): %v", s.arg.Host, len(body))
respBody, err := s.GetTurn(ctx, protocol.MetadataCmdSyncPassages, body)
if err != nil {
return err
}
defer respBody.Closer.Close()
var buf = make([]byte, 2)
if _, err = io.ReadFull(respBody.Reader, buf); err != nil {
return err
}
if !bytes.Equal(buf, []byte("OK")) {
return fmt.Errorf("unexpected SyncPassages response from server: %v", string(buf))
}
return nil
}