0.1.0

internal/peer/peer.go

@@ -0,0 +1,102 @@
+package peer
+
+import (
+	"errors"
+	"io"
+	"log/slog"
+	"net"
+	"sync"
+
+	"github.com/shadowsocks/go-shadowsocks2/core"
+)
+
+const (
+	tcpNetwork = "tcp"
+	bufferSize = 32 * 1024 // 32KB
+)
+
+// Ошибки подключения
+var (
+	ErrNotConnected = errors.New("peer is not connected")
+)
+
+type Peer struct {
+	pubKey        string
+	connEncrypted net.Conn
+	mu            sync.Mutex
+	active        bool
+}
+
+func NewPeer(pubKey string) *Peer {
+	return &Peer{
+		pubKey: pubKey,
+		active: false,
+	}
+}
+
+func (p *Peer) Connect(ip, port string) error {
+	p.mu.Lock()
+	defer p.mu.Unlock()
+
+	if p.active {
+		return nil // Уже подключен
+	}
+
+	conn, err := net.Dial(tcpNetwork, net.JoinHostPort(ip, port))
+	if err != nil {
+		return err
+	}
+
+	cipher, err := core.PickCipher("AEAD_CHACHA20_POLY1305", []byte(p.pubKey), "")
+	if err != nil {
+		conn.Close()
+		return err
+	}
+
+	p.connEncrypted = cipher.StreamConn(conn)
+	p.active = true
+	return nil
+}
+
+func (p *Peer) Disconnect() error {
+	p.mu.Lock()
+	defer p.mu.Unlock()
+
+	if !p.active {
+		return nil
+	}
+
+	err := p.connEncrypted.Close()
+	p.active = false
+	return err
+}
+
+func (p *Peer) Start(localClient net.Conn) error {
+	if !p.active {
+		return ErrNotConnected
+	}
+
+	var wg sync.WaitGroup
+	wg.Add(2)
+
+	// Логика проксирования в обе стороны
+	go p.pipeData(localClient, p.connEncrypted, &wg)
+	go p.pipeData(p.connEncrypted, localClient, &wg)
+
+	wg.Wait()
+	return nil
+}
+
+func (p *Peer) pipeData(src, dst net.Conn, wg *sync.WaitGroup) {
+	defer wg.Done()
+
+	buf := make([]byte, bufferSize)
+	_, err := io.CopyBuffer(dst, src, buf)
+	if err != nil {
+		slog.Warn("pipe data error", slog.String("message", err.Error()))
+	}
+
+	// Закрываем соединения при завершении
+	src.Close()
+	dst.Close()
+}