mirror of
https://github.com/e1732a364fed/v2ray_simple.git
synced 2025-10-14 13:03:45 +08:00
407 lines
8.9 KiB
Go
407 lines
8.9 KiB
Go
package vless
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import (
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"bytes"
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"encoding/binary"
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"errors"
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"fmt"
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"io"
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"log"
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"net"
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"net/url"
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"sync"
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"time"
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"unsafe"
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"github.com/hahahrfool/v2ray_simple/netLayer"
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"github.com/hahahrfool/v2ray_simple/proxy"
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"github.com/hahahrfool/v2ray_simple/utils"
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)
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func init() {
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proxy.RegisterServer(Name, &ServerCreator{})
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}
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//实现 proxy.UserServer 以及 tlsLayer.UserHaser
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type Server struct {
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proxy.ProxyCommonStruct
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userHashes map[[16]byte]*proxy.V2rayUser
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userCRUMFURS map[[16]byte]*CRUMFURS
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mux4Hashes sync.RWMutex
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}
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type ServerCreator struct{}
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func (_ ServerCreator) NewServer(lc *proxy.ListenConf) (proxy.Server, error) {
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uuidStr := lc.Uuid
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id, err := proxy.NewV2rayUser(uuidStr)
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if err != nil {
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return nil, err
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}
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s := &Server{
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userHashes: make(map[[16]byte]*proxy.V2rayUser),
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userCRUMFURS: make(map[[16]byte]*CRUMFURS),
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}
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s.addV2User(id)
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return s, nil
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}
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func (_ ServerCreator) NewServerFromURL(u *url.URL) (proxy.Server, error) {
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return NewServer(u)
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}
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func NewServer(url *url.URL) (proxy.Server, error) {
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addr := url.Host
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uuidStr := url.User.Username()
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id, err := proxy.NewV2rayUser(uuidStr)
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if err != nil {
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return nil, err
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}
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s := &Server{
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ProxyCommonStruct: proxy.ProxyCommonStruct{Addr: addr},
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userHashes: make(map[[16]byte]*proxy.V2rayUser),
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userCRUMFURS: make(map[[16]byte]*CRUMFURS),
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}
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s.ProxyCommonStruct.InitFromUrl(url)
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s.addV2User(id)
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return s, nil
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}
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func (s *Server) CanFallback() bool {
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return true
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}
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func (s *Server) addV2User(u *proxy.V2rayUser) {
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s.userHashes[*u] = u
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}
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func (s *Server) AddV2User(u *proxy.V2rayUser) {
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s.mux4Hashes.Lock()
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s.userHashes[*u] = u
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s.mux4Hashes.Unlock()
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}
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func (s *Server) DelV2User(u *proxy.V2rayUser) {
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s.mux4Hashes.RLock()
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hasu := s.userHashes[*u]
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if hasu == nil {
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s.mux4Hashes.RUnlock()
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return
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}
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s.mux4Hashes.Lock()
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delete(s.userHashes, *u)
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s.mux4Hashes.Unlock()
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}
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func (s *Server) GetUserByBytes(bs []byte) proxy.User {
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if len(bs) < 16 {
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return nil
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}
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thisUUIDBytes := *(*[16]byte)(unsafe.Pointer(&bs[0]))
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if s.userHashes[thisUUIDBytes] != nil {
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return proxy.V2rayUser(thisUUIDBytes)
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}
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return nil
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}
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func (s *Server) HasUserByBytes(bs []byte) bool {
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if len(bs) < 16 {
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return false
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}
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if s.userHashes[*(*[16]byte)(unsafe.Pointer(&bs[0]))] != nil {
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return true
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}
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return false
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}
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func (s *Server) UserBytesLen() int {
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return 16
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}
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func (s *Server) GetUserByStr(str string) proxy.User {
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u, e := utils.StrToUUID(str)
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if e != nil {
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return nil
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}
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return s.GetUserByBytes(u[:])
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}
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func (s *Server) Name() string { return Name }
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// 返回的bytes.Buffer 是用于 回落使用的，内含了整个读取的数据;不回落时不要使用该Buffer
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func (s *Server) Handshake(underlay net.Conn) (io.ReadWriter, *netLayer.Addr, error) {
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if err := underlay.SetReadDeadline(time.Now().Add(time.Second * 4)); err != nil {
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return nil, nil, err
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}
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defer underlay.SetReadDeadline(time.Time{})
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//这里我们本 不用再创建一个buffer来缓存数据，因为tls包本身就是有缓存的，所以一点一点读就行，tcp本身系统也是有缓存的
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// 因此v1.0.3以及更老版本都是直接一段一段read的。
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//但是，因为需要支持fallback技术，所以还是要 进行缓存
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readbs := utils.GetBytes(utils.StandardBytesLength)
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//var auth [17]byte
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wholeReadLen, err := underlay.Read(readbs)
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if err != nil {
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return nil, nil, utils.NewDataErr("read err", err, wholeReadLen)
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}
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if wholeReadLen < 17 {
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//根据下面回答，HTTP的最小长度恰好是16字节，但是是0.9版本。1.0是18字节，1.1还要更长。总之我们可以直接不返回fallback地址
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//https://stackoverflow.com/questions/25047905/http-request-minimum-size-in-bytes/25065089
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return nil, nil, utils.NewDataErr("fallback, msg too short", nil, wholeReadLen)
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}
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readbuf := bytes.NewBuffer(readbs[:wholeReadLen])
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var returnErr error
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goto realPart
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errorPart:
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//所返回的buffer必须包含所有数据，而Buffer不支持回退，所以只能重新New
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return nil, nil, &utils.ErrFirstBuffer{
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Err: returnErr,
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First: bytes.NewBuffer(readbs[:wholeReadLen]),
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}
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realPart:
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//这部分过程可以参照 v2ray的 proxy/vless/encoding/encoding.go DecodeRequestHeader 方法
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//see https://github.com/v2fly/v2ray-core/blob/master/proxy/vless/inbound/inbound.go
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auth := readbuf.Next(17)
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version := auth[0]
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if version > 1 {
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returnErr = utils.NewDataErr("Vless invalid version ", nil, version)
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goto errorPart
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}
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idBytes := auth[1:17]
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s.mux4Hashes.RLock()
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thisUUIDBytes := *(*[16]byte)(unsafe.Pointer(&idBytes[0])) //下面crumfurs也有用到
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if user := s.userHashes[thisUUIDBytes]; user != nil {
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s.mux4Hashes.RUnlock()
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} else {
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s.mux4Hashes.RUnlock()
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returnErr = errors.New("invalid user")
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goto errorPart
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}
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if version == 0 {
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addonLenByte, err := readbuf.ReadByte()
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if err != nil {
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return nil, nil, err //凡是和的层Read相关的错误，一律不再返回Fallback信息，因为连接已然不可用
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}
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if addonLenByte != 0 {
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//v2ray的vless中没有对应的任何处理。
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//v2ray 的 vless 虽然有一个没用的Flow，但是 EncodeBodyAddons里根本没向里写任何数据。所以理论上正常这部分始终应该为0
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if utils.CanLogWarn() {
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log.Println("potential illegal client", addonLenByte)
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}
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//读一下然后直接舍弃
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/*
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tmpBuf := utils.GetBytes(int(addonLenByte))
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underlay.Read(tmpBuf)
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utils.PutBytes(tmpBuf)
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*/
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if tmpbs := readbuf.Next(int(addonLenByte)); len(tmpbs) != int(addonLenByte) {
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return nil, nil, errors.New("vless short read in addon")
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}
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}
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}
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commandByte, err := readbuf.ReadByte()
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if err != nil {
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returnErr = errors.New("fallback, reason 2")
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goto errorPart
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}
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addr := &netLayer.Addr{}
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switch commandByte {
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case CmdMux: //实际目前verysimple 暂时还未实现mux，先这么写
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addr.Port = 0
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addr.Name = "v1.mux.cool"
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case Cmd_CRUMFURS:
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if version != 1 {
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returnErr = errors.New("在vless的vesion不为1时使用了 CRUMFURS 命令")
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goto errorPart
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}
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_, err = underlay.Write([]byte{CRUMFURS_ESTABLISHED})
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if err != nil {
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returnErr = utils.NewErr("write to crumfurs err", err)
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goto errorPart
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}
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addr.Name = CRUMFURS_Established_Str // 使用这个特殊的办法来告诉调用者，预留了 CRUMFURS 信道，防止其关闭上层连接导致 CRUMFURS 信道 被关闭。
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theCRUMFURS := &CRUMFURS{
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Conn: underlay,
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}
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s.mux4Hashes.Lock()
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s.userCRUMFURS[thisUUIDBytes] = theCRUMFURS
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s.mux4Hashes.Unlock()
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return nil, addr, nil
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case CmdTCP, CmdUDP:
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portbs := readbuf.Next(2)
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if err != nil || len(portbs) != 2 {
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returnErr = errors.New("fallback, reason 3")
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goto errorPart
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}
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addr.Port = int(binary.BigEndian.Uint16(portbs))
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if commandByte == CmdUDP {
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addr.Network = "udp"
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}
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var ip_or_domain_bytesLength byte = 0
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addrTypeByte, err := readbuf.ReadByte()
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if err != nil {
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returnErr = errors.New("fallback, reason 4")
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goto errorPart
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}
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switch addrTypeByte {
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case netLayer.AtypIP4:
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ip_or_domain_bytesLength = net.IPv4len
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addr.IP = utils.GetBytes(net.IPv4len)
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case netLayer.AtypDomain:
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// 解码域名的长度
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domainNameLenByte, err := readbuf.ReadByte()
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if err != nil {
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returnErr = errors.New("fallback, reason 5")
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goto errorPart
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}
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ip_or_domain_bytesLength = domainNameLenByte
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case netLayer.AtypIP6:
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ip_or_domain_bytesLength = net.IPv6len
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addr.IP = utils.GetBytes(net.IPv6len)
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default:
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returnErr = fmt.Errorf("unknown address type %v", addrTypeByte)
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goto errorPart
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}
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ip_or_domain := utils.GetBytes(int(ip_or_domain_bytesLength))
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_, err = readbuf.Read(ip_or_domain)
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if err != nil {
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return nil, nil, errors.New("fallback, reason 6")
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}
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if addr.IP != nil {
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copy(addr.IP, ip_or_domain)
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} else {
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addr.Name = string(ip_or_domain)
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}
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utils.PutBytes(ip_or_domain)
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default:
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returnErr = errors.New("invalid vless command")
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goto errorPart
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}
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return &UserConn{
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Conn: underlay,
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optionalReader: io.MultiReader(readbuf, underlay),
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remainFirstBufLen: readbuf.Len(),
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uuid: thisUUIDBytes,
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version: int(version),
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isUDP: addr.IsUDP(),
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underlayIsBasic: netLayer.IsBasicConn(underlay),
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isServerEnd: true,
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}, addr, nil
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}
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func (s *Server) Get_CRUMFURS(id string) *CRUMFURS {
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bs, err := utils.StrToUUID(id)
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if err != nil {
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return nil
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}
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return s.userCRUMFURS[bs]
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}
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type CRUMFURS struct {
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net.Conn
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hasAdvancedLayer bool //在用ws或grpc时，这个开关保持打开
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}
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func (c *CRUMFURS) WriteUDPResponse(a *net.UDPAddr, b []byte) (err error) {
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atype := netLayer.AtypIP4
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if len(a.IP) > 4 {
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atype = netLayer.AtypIP6
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}
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buf := utils.GetBuf()
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buf.WriteByte(atype)
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buf.Write(a.IP)
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buf.WriteByte(byte(int16(a.Port) >> 8))
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buf.WriteByte(byte(int16(a.Port) << 8 >> 8))
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if !c.hasAdvancedLayer {
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lb := int16(len(b))
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buf.WriteByte(byte(lb >> 8))
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buf.WriteByte(byte(lb << 8 >> 8))
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}
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buf.Write(b)
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_, err = c.Write(buf.Bytes())
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utils.PutBuf(buf)
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return
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}
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