func PipeThenClose(src, dst net.Conn, is_res bool, host string, user user.User) {
var pipeBuf = leakybuf.NewLeakyBuf(nBuf, bufSize)
defer dst.Close()
buf := pipeBuf.Get()
// defer pipeBuf.Put(buf)
var size int
for {
SetReadTimeout(src)
n, err := src.Read(buf)
// read may return EOF with n > 0
// should always process n > 0 bytes before handling error
if n > 0 {
size, err = dst.Write(buf[0:n])
if is_res {
err = storage.IncrSize(user, size)
if err != nil {
Log.Error(err)
}
Log.Debug(fmt.Sprintf("[port-%d] store size: %d", user.GetPort(), size))
}
if err != nil {
Log.Debug("write:", err)
break
}
}
if err != nil || n == 0 {
// Always "use of closed network connection", but no easy way to
// identify this specific error. So just leave the error along for now.
// More info here: https://code.google.com/p/go/issues/detail?id=4373
break
}
}
return
}
func runWithCustomMethod(user user.User) {
// port, password string, Cipher *ss.Cipher
port := strconv.Itoa(user.GetPort())
// 检测端口是否已存在
_, ok := passwdManager.get(port)
// 如果存在
if ok {
return
}
password := user.GetPasswd()
ln, err := net.Listen("tcp", ":"+port)
if err != nil {
Log.Error(fmt.Sprintf("error listening port %v: %v\n", port, err))
// os.Exit(1)
return
}
passwdManager.add(port, password, ln)
cipher, err, auth := user.GetCipher()
if err != nil {
return
}
Log.Info(fmt.Sprintf("server listening port %v ...\n", port))
for {
conn, err := ln.Accept()
if err != nil {
// listener maybe closed to update password
Log.Debug(fmt.Sprintf("accept error: %v\n", err))
return
}
// Creating cipher upon first connection.
if cipher == nil {
Log.Debug("creating cipher for port:", port)
method := user.GetMethod()
if strings.HasSuffix(method, "-auth") {
method = method[:len(method)-5]
auth = true
} else {
auth = false
}
cipher, err = ss.NewCipher(method, password)
if err != nil {
Log.Error(fmt.Sprintf("Error generating cipher for port: %s %v\n", port, err))
conn.Close()
continue
}
}
go handleConnection(user, ss.NewConn(conn, cipher.Copy()), auth)
}
}
func showConn(raw_req_header, raw_res_header []byte, host string, user user.User, size int, is_http bool) {
if size == 0 {
Log.Error(fmt.Sprintf("[port-%d] Error: request %s cancel", user.GetPort(), host))
return
}
if is_http {
req, _ := http.ReadRequest(bufio.NewReader(bytes.NewReader(raw_req_header)))
if req == nil {
lines := bytes.SplitN(raw_req_header, []byte(" "), 2)
Log.Debug(fmt.Sprintf("%s http://%s/ \"Unknow\" HTTP/1.1 unknow user-port: %d size: %d\n", lines[0], host, user.GetPort(), size))
return
}
res, _ := http.ReadResponse(bufio.NewReader(bytes.NewReader(raw_res_header)), req)
statusCode := 200
if res != nil {
statusCode = res.StatusCode
}
Log.Debug(fmt.Sprintf("%s http://%s%s \"%s\" %s %d user-port: %d size: %d\n", req.Method, req.Host, req.URL.String(), req.Header.Get("user-agent"), req.Proto, statusCode, user.GetPort(), size))
} else {
Log.Debug(fmt.Sprintf("CONNECT %s \"NONE\" NONE NONE user-port: %d size: %d\n", host, user.GetPort(), size))
}
}
func PipeThenCloseOta(src *ss.Conn, dst net.Conn, is_res bool, host string, user user.User) {
const (
dataLenLen = 2
hmacSha1Len = 10
idxData0 = dataLenLen + hmacSha1Len
)
defer func() {
dst.Close()
}()
var pipeBuf = leakybuf.NewLeakyBuf(nBuf, bufSize)
buf := pipeBuf.Get()
// sometimes it have to fill large block
for i := 1; ; i += 1 {
SetReadTimeout(src)
n, err := io.ReadFull(src, buf[:dataLenLen+hmacSha1Len])
if err != nil {
if err == io.EOF {
break
}
Log.Debug(fmt.Sprintf("conn=%p #%v read header error n=%v: %v", src, i, n, err))
break
}
dataLen := binary.BigEndian.Uint16(buf[:dataLenLen])
expectedHmacSha1 := buf[dataLenLen:idxData0]
var dataBuf []byte
if len(buf) < int(idxData0+dataLen) {
dataBuf = make([]byte, dataLen)
} else {
dataBuf = buf[idxData0 : idxData0+dataLen]
}
if n, err := io.ReadFull(src, dataBuf); err != nil {
if err == io.EOF {
break
}
Log.Debug(fmt.Sprintf("conn=%p #%v read data error n=%v: %v", src, i, n, err))
break
}
chunkIdBytes := make([]byte, 4)
chunkId := src.GetAndIncrChunkId()
binary.BigEndian.PutUint32(chunkIdBytes, chunkId)
actualHmacSha1 := ss.HmacSha1(append(src.GetIv(), chunkIdBytes...), dataBuf)
if !bytes.Equal(expectedHmacSha1, actualHmacSha1) {
Log.Debug(fmt.Sprintf("conn=%p #%v read data hmac-sha1 mismatch, iv=%v chunkId=%v src=%v dst=%v len=%v expeced=%v actual=%v", src, i, src.GetIv(), chunkId, src.RemoteAddr(), dst.RemoteAddr(), dataLen, expectedHmacSha1, actualHmacSha1))
break
}
if n, err := dst.Write(dataBuf); err != nil {
Log.Debug(fmt.Sprintf("conn=%p #%v write data error n=%v: %v", dst, i, n, err))
break
}
if is_res {
err := storage.IncrSize(user, n)
if err != nil {
Log.Error(err)
}
Log.Debug(fmt.Sprintf("[port-%d] store size: %d", user.GetPort(), n))
}
}
return
}
func handleConnection(user user.User, conn *ss.Conn, auth bool) {
var host string
connCnt++ // this maybe not accurate, but should be enough
if connCnt-nextLogConnCnt >= 0 {
// XXX There's no xadd in the atomic package, so it's difficult to log
// the message only once with low cost. Also note nextLogConnCnt maybe
// added twice for current peak connection number level.
Log.Debug("Number of client connections reaches %d\n", nextLogConnCnt)
nextLogConnCnt += logCntDelta
}
// function arguments are always evaluated, so surround debug statement
// with if statement
Log.Debug(fmt.Sprintf("new client %s->%s\n", conn.RemoteAddr().String(), conn.LocalAddr()))
closed := false
defer func() {
if ssdebug {
Log.Debug(fmt.Sprintf("closed pipe %s<->%s\n", conn.RemoteAddr(), host))
}
connCnt--
if !closed {
conn.Close()
}
}()
host, res_size, ota, err := getRequest(conn, auth)
if err != nil {
Log.Error("error getting request", conn.RemoteAddr(), conn.LocalAddr(), err)
return
}
Log.Info(fmt.Sprintf("[port-%d]connecting %s ", user.GetPort(), host))
remote, err := net.Dial("tcp", host)
if err != nil {
if ne, ok := err.(*net.OpError); ok && (ne.Err == syscall.EMFILE || ne.Err == syscall.ENFILE) {
// log too many open file error
// EMFILE is process reaches open file limits, ENFILE is system limit
Log.Error("dial error:", err)
} else {
Log.Error("error connecting to:", host, err)
}
return
}
defer func() {
if !closed {
remote.Close()
}
}()
// debug conn info
Log.Debug(fmt.Sprintf("%d conn debug: local addr: %s | remote addr: %s network: %s ", user.GetPort(),
conn.LocalAddr().String(), conn.RemoteAddr().String(), conn.RemoteAddr().Network()))
err = storage.IncrSize(user, res_size)
if err != nil {
Log.Error(err)
return
}
err = storage.MarkUserOnline(user)
if err != nil {
Log.Error(err)
return
}
Log.Debug(fmt.Sprintf("[port-%d] store size: %d", user.GetPort(), res_size))
Log.Info(fmt.Sprintf("piping %s<->%s ota=%v connOta=%v", conn.RemoteAddr(), host, ota, conn.IsOta()))
if ota {
go PipeThenCloseOta(conn, remote, false, host, user)
} else {
go PipeThenClose(conn, remote, false, host, user)
}
PipeThenClose(remote, conn, true, host, user)
closed = true
return
}