优化项目机构和服务端协程控制逻辑
This commit is contained in:
82
server/pkg/socks5/auth.go
Normal file
82
server/pkg/socks5/auth.go
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@@ -0,0 +1,82 @@
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package socks5
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import (
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"context"
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"io"
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"log/slog"
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"proxy-server/pkg/utils"
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"slices"
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"github.com/pkg/errors"
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)
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type AuthMethod byte
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const (
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AuthVersion = byte(1)
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AuthSuccess = byte(0)
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AuthFailure = byte(1)
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NoAuth = AuthMethod(0)
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UserPassAuth = AuthMethod(2)
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NoAcceptable = byte(0xFF)
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)
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type Authenticator interface {
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Method() AuthMethod
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Authenticate(ctx context.Context, reader io.Reader, writer io.Writer) (*AuthContext, error)
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}
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// authenticate 执行认证流程
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func (server *Server) authenticate(reader io.Reader, writer io.Writer) (*AuthContext, error) {
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// 版本检查
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err := checkVersion(reader)
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if err != nil {
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return nil, err
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}
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// 获取客户端认证方式
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nAuth, err := utils.ReadByte(reader)
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if err != nil {
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return nil, err
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}
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methods, err := utils.ReadBuffer(reader, int(nAuth))
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if err != nil {
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return nil, err
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}
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// 认证客户端连接
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for _, authenticator := range server.config.AuthMethods {
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method := authenticator.Method()
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if slices.Contains(methods, byte(method)) {
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slog.Debug("使用的认证方式", method)
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_, err := writer.Write([]byte{SocksVersion, byte(method)})
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if err != nil {
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slog.Error("响应认证方式失败", err)
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return nil, err
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}
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ctx := context.WithValue(context.Background(), "service", server)
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authContext, err := authenticator.Authenticate(ctx, reader, writer)
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if err != nil {
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return nil, err
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}
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return authContext, nil
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}
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}
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// 无适用的认证方式
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_, err = writer.Write([]byte{SocksVersion, NoAcceptable})
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if err != nil {
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return nil, err
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}
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return nil, errors.New("没有适用的认证方式")
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}
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type AuthContext struct {
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Method AuthMethod
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Timeout uint
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Payload map[string]any
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}
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7
server/pkg/socks5/error.go
Normal file
7
server/pkg/socks5/error.go
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@@ -0,0 +1,7 @@
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package socks5
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type ConfigError string
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func (c ConfigError) Error() string {
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return string(c)
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}
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405
server/pkg/socks5/request.go
Normal file
405
server/pkg/socks5/request.go
Normal file
@@ -0,0 +1,405 @@
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package socks5
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import (
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"context"
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"fmt"
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"io"
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"log/slog"
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"net"
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"proxy-server/pkg/utils"
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"strconv"
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"github.com/pkg/errors"
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)
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const (
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ConnectCommand = byte(1)
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BindCommand = byte(2)
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AssociateCommand = byte(3)
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ipv4Address = byte(1)
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fqdnAddress = byte(3)
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ipv6Address = byte(4)
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)
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const (
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successReply byte = iota
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serverFailure
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ruleFailure
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networkUnreachable
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hostUnreachable
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connectionRefused
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ttlExpired
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commandNotSupported
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addrTypeNotSupported
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)
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var (
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unrecognizedAddrType = fmt.Errorf("Unrecognized address type")
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)
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// AddressRewriter is used to rewrite a destination transparently
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type AddressRewriter interface {
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Rewrite(ctx context.Context, request *Request) (context.Context, *AddrSpec)
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}
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// AddrSpec 地址
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type AddrSpec struct {
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FQDN string
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IP net.IP
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Port int
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}
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func (a AddrSpec) String() string {
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if a.FQDN != "" {
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return fmt.Sprintf("%s (%s):%d", a.FQDN, a.IP, a.Port)
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}
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return fmt.Sprintf("%s:%d", a.IP, a.Port)
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}
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// Address returns a string suitable to dial; prefer returning IP-based
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// address, fallback to FQDN
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func (a AddrSpec) Address() string {
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if 0 != len(a.IP) {
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return net.JoinHostPort(a.IP.String(), strconv.Itoa(a.Port))
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}
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return net.JoinHostPort(a.FQDN, strconv.Itoa(a.Port))
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}
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func (server *Server) request(reader io.Reader, writer io.Writer) (*Request, error) {
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// 检查版本
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err := checkVersion(reader)
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if err != nil {
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return nil, err
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}
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// 检查连接命令
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command, err := utils.ReadByte(reader)
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if err != nil {
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return nil, err
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}
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slog.Debug("客户端使用的连接指令：%v", command)
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if command != ConnectCommand && command != BindCommand && command != AssociateCommand {
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err = sendReply(writer, commandNotSupported, nil)
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if err != nil {
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return nil, err
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}
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return nil, errors.New("不支持该连接指令")
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}
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// 跳过保留字段 rsv
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_, err = utils.ReadByte(reader)
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if err != nil {
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return nil, err
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}
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// 获取目标地址
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dest, err := server.parseTarget(reader, writer)
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if err != nil {
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return nil, err
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}
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request := &Request{
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Version: SocksVersion,
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Command: command,
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DestAddr: dest,
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bufConn: reader,
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}
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return request, nil
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}
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func (server *Server) parseTarget(reader io.Reader, writer io.Writer) (*AddrSpec, error) {
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dest := &AddrSpec{}
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aTypeBuf := make([]byte, 1)
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_, err := reader.Read(aTypeBuf)
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if err != nil {
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return nil, err
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}
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switch aTypeBuf[0] {
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case ipv4Address:
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addr := make([]byte, 4)
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_, err := io.ReadFull(reader, addr)
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if err != nil {
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return nil, err
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}
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dest.IP = addr
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case ipv6Address:
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addr := make([]byte, 16)
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_, err := io.ReadFull(reader, addr)
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if err != nil {
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return nil, err
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}
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dest.IP = addr
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case fqdnAddress:
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aLenBuf := make([]byte, 1)
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_, err := reader.Read(aLenBuf)
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if err != nil {
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return nil, err
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}
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fqdnBuff := make([]byte, int(aLenBuf[0]))
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_, err = io.ReadFull(reader, fqdnBuff)
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if err != nil {
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return nil, err
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}
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dest.FQDN = string(fqdnBuff)
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// 域名解析
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addr, err := server.config.Resolver.Resolve(dest.FQDN)
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if err != nil {
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err := sendReply(writer, hostUnreachable, nil)
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if err != nil {
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return nil, fmt.Errorf("Failed to send reply: %v", err)
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}
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return nil, fmt.Errorf("Failed to resolve destination '%v': %v", dest.FQDN, err)
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}
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dest.IP = addr
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default:
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err := sendReply(writer, addrTypeNotSupported, nil)
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if err != nil {
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return nil, err
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}
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return nil, unrecognizedAddrType
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}
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portBuf := make([]byte, 2)
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_, err = io.ReadFull(reader, portBuf)
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if err != nil {
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return nil, err
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}
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dest.Port = (int(portBuf[0]) << 8) | int(portBuf[1])
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return dest, nil
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}
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// A Request represents request received by a server
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type Request struct {
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// Protocol version
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Version uint8
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// Requested command
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Command uint8
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// AuthContext provided during negotiation
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AuthContext *AuthContext
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// AddrSpec of the network that sent the request
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RemoteAddr *AddrSpec
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// AddrSpec of the desired destination
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DestAddr *AddrSpec
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// AddrSpec of the actual destination (might be affected by rewrite)
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realDestAddr *AddrSpec
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bufConn io.Reader
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}
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func (server *Server) handle(req *Request, conn net.Conn) error {
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ctx := context.Background()
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// 目标地址重写
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req.realDestAddr = req.DestAddr
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if server.config.Rewriter != nil {
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ctx, req.realDestAddr = server.config.Rewriter.Rewrite(ctx, req)
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}
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// 根据协商方法建立连接
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switch req.Command {
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case ConnectCommand:
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return server.handleConnect(ctx, conn, req)
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case BindCommand:
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return server.handleBind(ctx, conn, req)
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case AssociateCommand:
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return server.handleAssociate(ctx, conn, req)
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default:
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return fmt.Errorf("unsupported command: %v", req.Command)
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}
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}
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func (server *Server) handleConnect(ctx context.Context, conn net.Conn, req *Request) error {
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// 检查规则集约束
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server.config.Logger.Printf("检查约束规则\n")
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if ctx_, ok := server.config.Rules.Allow(ctx, req); !ok {
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if err := sendReply(conn, ruleFailure, nil); err != nil {
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return fmt.Errorf("failed to send reply: %v", err)
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}
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return fmt.Errorf("request to %v blocked by rules", req.DestAddr)
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} else {
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ctx = ctx_
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}
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slog.Info("需要向 " + req.DestAddr.Address() + " 建立连接")
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server.Conn <- ProxyData{conn, req.realDestAddr.Address()}
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return nil
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// 与目标服务器建立连接
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// server.config.Logger.Printf("与目标服务器建立连接\n")
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// dial := server.config.Dial
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// target, err := dial("tcp", req.realDestAddr.Address())
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// if err != nil {
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// msg := err.Error()
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// resp := hostUnreachable
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// if strings.Contains(msg, "refused") {
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// resp = connectionRefused
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// } else if strings.Contains(msg, "network is unreachable") {
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// resp = networkUnreachable
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// }
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//
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// err := sendReply(Conn, resp, nil)
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// if err != nil {
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// return fmt.Errorf("failed to send reply: %v", err)
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// }
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// return fmt.Errorf("request to %v failed: %v", req.DestAddr, err)
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// }
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// defer closeConnection(target)
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//
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// // 正常响应
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// slog.Info("连接成功，开始代理流量")
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//
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// local := target.LocalAddr().(*net.TCPAddr)
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// bind := AddrSpec{IP: local.IP, Port: local.Port}
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// err = sendReply(Conn, successReply, &bind)
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// if err != nil {
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// return fmt.Errorf("Failed to send reply: %v", err)
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// }
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//
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// // 配置超时时间和行为
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// timeout := req.AuthContext.Timeout
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// slog.Debug("超时时间", "timeout", timeout)
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//
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// timeoutCtx, cancel := context.WithTimeout(ctx, time.Duration(timeout)*time.Second)
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// defer cancel()
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//
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// // 代理流量
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// errChan := make(chan error, 2)
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// go func() {
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// _, err = io.Copy(target, req.bufConn)
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// errChan <- err
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// }()
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// go func() {
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// _, err = io.Copy(Conn, target)
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// errChan <- err
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// }()
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//
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// for {
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// select {
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//
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// case <-timeoutCtx.Done():
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// slog.Debug("超时断开连接")
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// // todo 根据 termination 执行不同的断开行为
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// return nil
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//
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// case err := <-errChan:
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// slog.Debug("主动断开连接")
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// if err != nil {
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// return errors.Wrap(err, "代理流量出现错误")
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// }
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// return nil
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// }
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// }
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}
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func (server *Server) handleBind(ctx context.Context, conn net.Conn, req *Request) error {
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// Check if this is allowed
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if ctx_, ok := server.config.Rules.Allow(ctx, req); !ok {
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if err := sendReply(conn, ruleFailure, nil); err != nil {
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return fmt.Errorf("Failed to send reply: %v", err)
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}
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return fmt.Errorf("Bind to %v blocked by rules", req.DestAddr)
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} else {
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ctx = ctx_
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}
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// TODO: Support bind
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if err := sendReply(conn, commandNotSupported, nil); err != nil {
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return fmt.Errorf("Failed to send reply: %v", err)
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}
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return nil
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}
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func (server *Server) handleAssociate(ctx context.Context, conn net.Conn, req *Request) error {
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// Check if this is allowed
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if ctx_, ok := server.config.Rules.Allow(ctx, req); !ok {
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if err := sendReply(conn, ruleFailure, nil); err != nil {
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return fmt.Errorf("Failed to send reply: %v", err)
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}
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return fmt.Errorf("Associate to %v blocked by rules", req.DestAddr)
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} else {
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ctx = ctx_
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}
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// TODO: Support associate
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if err := sendReply(conn, commandNotSupported, nil); err != nil {
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return fmt.Errorf("Failed to send reply: %v", err)
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}
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return nil
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}
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func sendReply(w io.Writer, resp uint8, addr *AddrSpec) error {
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var addrType uint8
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var addrBody []byte
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var addrPort uint16
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switch {
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case addr == nil:
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addrType = ipv4Address
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addrBody = []byte{0, 0, 0, 0}
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addrPort = 0
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case addr.FQDN != "":
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addrType = fqdnAddress
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addrBody = append([]byte{byte(len(addr.FQDN))}, addr.FQDN...)
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addrPort = uint16(addr.Port)
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case addr.IP.To4() != nil:
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addrType = ipv4Address
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addrBody = addr.IP.To4()
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addrPort = uint16(addr.Port)
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case addr.IP.To16() != nil:
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addrType = ipv6Address
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addrBody = addr.IP.To16()
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addrPort = uint16(addr.Port)
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default:
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return fmt.Errorf("failed to format address: %v", addr)
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}
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|
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msg := make([]byte, 6+len(addrBody))
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msg[0] = SocksVersion
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msg[1] = resp
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msg[2] = 0 // Reserved
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msg[3] = addrType
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copy(msg[4:], addrBody)
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msg[4+len(addrBody)] = byte(addrPort >> 8)
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msg[4+len(addrBody)+1] = byte(addrPort & 0xff)
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|
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_, err := w.Write(msg)
|
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return err
|
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}
|
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|
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func SendSuccess(user net.Conn, target net.Conn) {
|
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local := target.LocalAddr().(*net.TCPAddr)
|
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bind := AddrSpec{IP: local.IP, Port: local.Port}
|
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err := sendReply(user, successReply, &bind)
|
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if err != nil {
|
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slog.Error("Failed to send reply", err)
|
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}
|
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}
|
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|
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type ProxyData struct {
|
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// 用户连入的连接
|
||||
Conn net.Conn
|
||||
// 用户目标地址
|
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Dest string
|
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}
|
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|
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func (d ProxyData) Tag() string {
|
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local := d.Conn.LocalAddr()
|
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remote := d.Conn.RemoteAddr()
|
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return fmt.Sprintf("%s-%s", remote, local)
|
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}
|
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21
server/pkg/socks5/resolver.go
Normal file
21
server/pkg/socks5/resolver.go
Normal file
@@ -0,0 +1,21 @@
|
||||
package socks5
|
||||
|
||||
import (
|
||||
"net"
|
||||
)
|
||||
|
||||
// NameResolver 域名解析器
|
||||
type NameResolver interface {
|
||||
Resolve(name string) (net.IP, error)
|
||||
}
|
||||
|
||||
// DNSResolver 使用系统 dns 服务解析域名
|
||||
type DNSResolver struct{}
|
||||
|
||||
func (d DNSResolver) Resolve(name string) (net.IP, error) {
|
||||
addr, err := net.ResolveIPAddr("ip", name)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return addr.IP, err
|
||||
}
|
||||
41
server/pkg/socks5/ruleset.go
Normal file
41
server/pkg/socks5/ruleset.go
Normal file
@@ -0,0 +1,41 @@
|
||||
package socks5
|
||||
|
||||
import (
|
||||
"context"
|
||||
)
|
||||
|
||||
// RuleSet is used to provide custom rules to allow or prohibit actions
|
||||
type RuleSet interface {
|
||||
Allow(ctx context.Context, req *Request) (context.Context, bool)
|
||||
}
|
||||
|
||||
// PermitAll returns a RuleSet which allows all types of connections
|
||||
func PermitAll() RuleSet {
|
||||
return &PermitCommand{true, true, true}
|
||||
}
|
||||
|
||||
// PermitNone returns a RuleSet which disallows all types of connections
|
||||
func PermitNone() RuleSet {
|
||||
return &PermitCommand{false, false, false}
|
||||
}
|
||||
|
||||
// PermitCommand is an implementation of the RuleSet which
|
||||
// enables filtering supported commands
|
||||
type PermitCommand struct {
|
||||
EnableConnect bool
|
||||
EnableBind bool
|
||||
EnableAssociate bool
|
||||
}
|
||||
|
||||
func (p *PermitCommand) Allow(ctx context.Context, req *Request) (context.Context, bool) {
|
||||
switch req.Command {
|
||||
case ConnectCommand:
|
||||
return ctx, p.EnableConnect
|
||||
case BindCommand:
|
||||
return ctx, p.EnableBind
|
||||
case AssociateCommand:
|
||||
return ctx, p.EnableAssociate
|
||||
}
|
||||
|
||||
return ctx, false
|
||||
}
|
||||
199
server/pkg/socks5/server.go
Normal file
199
server/pkg/socks5/server.go
Normal file
@@ -0,0 +1,199 @@
|
||||
package socks5
|
||||
|
||||
import (
|
||||
"bufio"
|
||||
"errors"
|
||||
"fmt"
|
||||
"io"
|
||||
"log"
|
||||
"log/slog"
|
||||
"net"
|
||||
"os"
|
||||
"proxy-server/pkg/utils"
|
||||
"strconv"
|
||||
)
|
||||
|
||||
const (
|
||||
SocksVersion = byte(5)
|
||||
)
|
||||
|
||||
type Config struct {
|
||||
Name string
|
||||
|
||||
Host string
|
||||
Port uint16
|
||||
|
||||
// 认证方法
|
||||
AuthMethods []Authenticator
|
||||
|
||||
// 域名解析
|
||||
Resolver NameResolver
|
||||
|
||||
// 自定义认证规则
|
||||
Rules RuleSet
|
||||
|
||||
// 地址重写
|
||||
Rewriter AddressRewriter
|
||||
|
||||
// 用于 bind 和 associate
|
||||
BindIP net.IP
|
||||
|
||||
// Logger
|
||||
Logger *log.Logger
|
||||
|
||||
// 自定义连接流程
|
||||
Dial func(network, addr string) (net.Conn, error)
|
||||
}
|
||||
|
||||
type Server struct {
|
||||
config *Config
|
||||
Name string
|
||||
Port uint16
|
||||
Conn chan ProxyData
|
||||
}
|
||||
|
||||
// New 创建服务器
|
||||
func New(conf *Config) (*Server, error) {
|
||||
if len(conf.AuthMethods) == 0 {
|
||||
return nil, ConfigError("认证方法不能为空")
|
||||
}
|
||||
|
||||
if conf.Resolver == nil {
|
||||
conf.Resolver = DNSResolver{}
|
||||
}
|
||||
|
||||
if conf.Rules == nil {
|
||||
conf.Rules = PermitAll()
|
||||
}
|
||||
|
||||
if conf.Logger == nil {
|
||||
conf.Logger = log.New(os.Stdout, "", log.LstdFlags)
|
||||
}
|
||||
|
||||
if conf.Dial == nil {
|
||||
conf.Dial = func(network, addr string) (net.Conn, error) {
|
||||
return net.Dial(network, addr)
|
||||
}
|
||||
}
|
||||
|
||||
return &Server{
|
||||
config: conf,
|
||||
Name: conf.Name,
|
||||
Port: conf.Port,
|
||||
Conn: make(chan ProxyData, 100),
|
||||
}, nil
|
||||
}
|
||||
|
||||
// Run 监听端口
|
||||
func (server *Server) Run() error {
|
||||
host := server.config.Host
|
||||
port := server.config.Port
|
||||
addr := net.JoinHostPort(host, strconv.Itoa(int(port)))
|
||||
|
||||
slog.Info("启动 socks5 代理服务")
|
||||
|
||||
listener, err := net.Listen("tcp", addr)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
defer closeListener(listener)
|
||||
|
||||
slog.Info("代理服务已启动，正在监听端口 " + addr)
|
||||
|
||||
for {
|
||||
conn, err := listener.Accept()
|
||||
if err != nil {
|
||||
slog.Error("客户端连接失败", err)
|
||||
continue
|
||||
}
|
||||
|
||||
go func() {
|
||||
err := server.serve(conn)
|
||||
if err != nil {
|
||||
slog.Error("连接异常退出", err)
|
||||
}
|
||||
}()
|
||||
}
|
||||
}
|
||||
|
||||
// serve 建立连接
|
||||
func (server *Server) serve(conn net.Conn) error {
|
||||
slog.Info("收到来自" + conn.RemoteAddr().String() + "的连接")
|
||||
|
||||
reader := bufio.NewReader(conn)
|
||||
|
||||
// 认证
|
||||
slog.Debug("开始认证流程")
|
||||
authContext, err := server.authenticate(reader, conn)
|
||||
if err != nil {
|
||||
conn.Close()
|
||||
slog.Error("认证失败", err)
|
||||
return err
|
||||
} else {
|
||||
slog.Debug("认证完成")
|
||||
}
|
||||
|
||||
// 处理连接请求
|
||||
slog.Debug("处理连接请求")
|
||||
request, err := server.request(reader, conn)
|
||||
if err != nil {
|
||||
slog.Error("连接请求处理失败", err)
|
||||
return err
|
||||
} else {
|
||||
slog.Debug("连接请求处理完成")
|
||||
}
|
||||
|
||||
request.AuthContext = authContext
|
||||
client, ok := conn.RemoteAddr().(*net.TCPAddr)
|
||||
if !ok {
|
||||
return fmt.Errorf("获取客户端地址失败")
|
||||
}
|
||||
|
||||
request.RemoteAddr = &AddrSpec{
|
||||
IP: client.IP,
|
||||
Port: client.Port,
|
||||
}
|
||||
|
||||
// 处理请求
|
||||
slog.Debug("开始代理流量")
|
||||
err = server.handle(request, conn)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
// checkVersion 检查客户端版本
|
||||
func checkVersion(reader io.Reader) error {
|
||||
version, err := utils.ReadByte(reader)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
slog.Debug("客户端请求版本", "version", version)
|
||||
|
||||
if version != SocksVersion {
|
||||
return errors.New("客户端版本不兼容")
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
// closeListener 关闭监听并处理可能的错误
|
||||
func closeListener(listener net.Listener) {
|
||||
err := listener.Close()
|
||||
if err != nil {
|
||||
slog.Info("结束监听端口")
|
||||
}
|
||||
}
|
||||
|
||||
// closeConnection 关闭连接并处理可能的错误
|
||||
func closeConnection(conn net.Conn) {
|
||||
err := conn.Close()
|
||||
if err != nil {
|
||||
slog.Error("连接异常关闭", err)
|
||||
} else {
|
||||
slog.Info("已关闭来自" + conn.RemoteAddr().String() + "的连接")
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user