重构代理解析流程，引入端口混合协议转发

server/fwd/core/auth.go

@@ -0,0 +1,136 @@
+package core
+
+import (
+	"log/slog"
+	"net"
+	"proxy-server/server/models"
+	"proxy-server/server/pkg/orm"
+	"time"
+
+	"github.com/pkg/errors"
+)
+
+type Payload struct {
+	ID uint
+}
+
+type AuthContext struct {
+	Timeout float64
+	Payload Payload
+	Meta    map[string]any
+}
+
+func CheckIp(conn net.Conn) (*AuthContext, error) {
+
+	// 获取用户地址
+	remoteAddr := conn.RemoteAddr().String()
+	remoteHost, _, err := net.SplitHostPort(remoteAddr)
+	if err != nil {
+		return nil, errors.Wrap(err, "noAuth 认证失败")
+	}
+
+	// 获取服务端口
+	localAddr := conn.LocalAddr().String()
+	_, localPort, err := net.SplitHostPort(localAddr)
+
+	// 查询权限记录
+	slog.Info("用户 " + remoteHost + " 请求连接到 " + localPort)
+	var channels []models.Channel
+	err = orm.DB.
+		Joins("INNER JOIN public.nodes n ON channels.node_id = n.id AND n.name = ?", localPort).
+		Joins("INNER JOIN public.users u ON channels.user_id = u.id").
+		Joins("INNER JOIN public.user_ips ip ON u.id = ip.user_id AND ip.ip_address = ?", remoteHost).
+		Where(&models.Channel{
+			AuthIp: true,
+		}).
+		Find(&channels).Error
+	if err != nil {
+		return nil, errors.New("查询用户权限失败")
+	}
+
+	// 记录应该只有一条
+	channel, err := orm.MaySingle(channels)
+	if err != nil {
+		return nil, errors.Wrap(err, "不在白名单内")
+	}
+
+	// 检查是否需要密码认证
+	if channel.AuthPass {
+		return nil, errors.New("需要密码认证")
+	}
+
+	// 检查权限是否过期
+	timeout := channel.Expiration.Sub(time.Now()).Seconds()
+	if timeout <= 0 {
+		return nil, errors.New("权限已过期")
+	}
+
+	return &AuthContext{
+		Timeout: timeout,
+		Payload: Payload{
+			channel.UserId,
+		},
+	}, nil
+}
+
+func CheckPass(conn net.Conn, username, password string) (*AuthContext, error) {
+
+	// 查询通道配置
+	var channel models.Channel
+	err := orm.DB.
+		Where(&models.Channel{
+			Username: username,
+			AuthPass: true,
+		}).
+		First(&channel).Error
+	if err != nil {
+		return nil, errors.Wrap(err, "用户不存在")
+	}
+
+	// 检查密码 todo 哈希
+	if channel.Password != password {
+		return nil, errors.New("密码错误")
+	}
+
+	// 检查权限是否过期
+	timeout := channel.Expiration.Sub(time.Now()).Seconds()
+	if timeout <= 0 {
+		return nil, errors.New("权限已过期")
+	}
+
+	// 如果用户设置了双验证则检查 ip 是否在白名单中
+	if channel.AuthIp {
+		slog.Debug("验证用户 ip")
+
+		// 获取用户地址
+		remoteAddr := conn.RemoteAddr().String()
+		remoteHost, _, err := net.SplitHostPort(remoteAddr)
+		if err != nil {
+			return nil, errors.Wrap(err, "无法获取连接信息")
+		}
+
+		// 查询通道配置
+
+		var ips int64
+		err = orm.DB.
+			Where(&models.UserIp{
+				UserId:    channel.UserId,
+				IpAddress: remoteHost,
+			}).
+			Count(&ips).Error
+		if err != nil {
+			return nil, errors.Wrap(err, "查询白名单失败")
+		}
+
+		if ips == 0 {
+			return nil, errors.New("不在白名单内")
+		}
+	}
+
+	return &AuthContext{
+		Timeout: timeout,
+		Payload: Payload{
+			channel.UserId,
+		},
+	}, nil
+}

server/fwd/core/conn.go

@@ -0,0 +1,67 @@
+package core
+
+import (
+	"bufio"
+	"fmt"
+	"net"
+	"time"
+)
+
+type Conn struct {
+	Conn     net.Conn
+	Reader   *bufio.Reader
+	Tag      string
+	Protocol string
+	Dest     *FwdAddr
+	Auth     *AuthContext
+}
+
+func (c Conn) Read(b []byte) (n int, err error) {
+	return c.Reader.Read(b)
+}
+
+func (c Conn) Write(b []byte) (n int, err error) {
+	return c.Conn.Write(b)
+}
+
+func (c Conn) Close() error {
+	return c.Conn.Close()
+}
+
+func (c Conn) LocalAddr() net.Addr {
+	return c.Conn.LocalAddr()
+}
+
+func (c Conn) RemoteAddr() net.Addr {
+	return c.Conn.RemoteAddr()
+}
+
+func (c Conn) SetDeadline(t time.Time) error {
+	return c.Conn.SetDeadline(t)
+}
+
+func (c Conn) SetReadDeadline(t time.Time) error {
+	return c.Conn.SetReadDeadline(t)
+}
+
+func (c Conn) SetWriteDeadline(t time.Time) error {
+	return c.Conn.SetWriteDeadline(t)
+}
+
+func (c Conn) DestAddr() net.Addr {
+	return c.Dest
+}
+
+type FwdAddr struct {
+	IP     net.IP
+	Port   int
+	Domain string
+}
+
+func (a FwdAddr) Network() string {
+	return "tcp"
+}
+
+func (a FwdAddr) String() string {
+	return fmt.Sprintf("%s:%d", a.IP, a.Port)
+}