mirror of https://gogs.blitter.com/RLabs/xs
Converted xsnet Read() ctrlStatOp logic to switch
This commit is contained in:
Russ Magee
parent
667328a91c
commit
b2e43f4bad
39
xsnet/net.go
39
xsnet/net.go
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@ -1195,6 +1195,7 @@ func (hc Conn) Read(b []byte) (n int, err error) {
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var hmacIn [HMAC_CHK_SZ]uint8
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var payloadLen uint32
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//------------- Read ctrl/status opcode --------------------
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// Read ctrl/status opcode (CSOHmacInvalid on hmac mismatch)
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err = binary.Read(*hc.c, binary.BigEndian, &ctrlStatOp)
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if err != nil {
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@ -1215,7 +1216,9 @@ func (hc Conn) Read(b []byte) (n int, err error) {
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hc.Close()
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return 0, errors.New("** ALERT - remote end detected HMAC mismatch - possible channel tampering **")
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}
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//----------------------------------------------------------
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//------------------ Read HMAC len ------------------------
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// Read the hmac and payload len first
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err = binary.Read(*hc.c, binary.BigEndian, &hmacIn)
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if err != nil {
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@ -1230,7 +1233,9 @@ func (hc Conn) Read(b []byte) (n int, err error) {
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logger.LogDebug(etxt)
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return 0, errors.New(etxt)
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}
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//----------------------------------------------------------
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//------------------ Read Payload len ---------------------
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err = binary.Read(*hc.c, binary.BigEndian, &payloadLen)
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if err != nil {
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if err.Error() == "EOF" {
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@ -1244,6 +1249,7 @@ func (hc Conn) Read(b []byte) (n int, err error) {
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logger.LogDebug(etxt)
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return 0, errors.New(etxt)
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}
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//----------------------------------------------------------
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if payloadLen > MAX_PAYLOAD_LEN {
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logger.LogDebug(fmt.Sprintf("[Insane payloadLen:%v]\n", payloadLen))
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@ -1251,6 +1257,7 @@ func (hc Conn) Read(b []byte) (n int, err error) {
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return 1, errors.New("Insane payloadLen")
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}
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//-------------------- Read Payload ------------------------
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var payloadBytes = make([]byte, payloadLen)
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n, err = io.ReadFull(*hc.c, payloadBytes)
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if err != nil {
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@ -1265,12 +1272,14 @@ func (hc Conn) Read(b []byte) (n int, err error) {
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logger.LogDebug(etxt)
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return 0, errors.New(etxt)
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}
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//----------------------------------------------------------
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if hc.logCipherText {
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log.Printf(" <:ctext:\r\n%s\r\n", hex.Dump(payloadBytes[:n]))
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}
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//fmt.Printf(" <:ctext:\r\n%s\r\n", hex.Dump(payloadBytes[:n]))
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//---------------- Verify Payload via HMAC -----------------
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hc.rm.Write(payloadBytes) // Calc hmac on received data
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hTmp := hc.rm.Sum(nil)[0:HMAC_CHK_SZ]
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//log.Printf("<%04x) HMAC:(i)%s (c)%02x\r\n", decryptN, hex.EncodeToString([]byte(hmacIn[0:])), hTmp)
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@ -1280,7 +1289,9 @@ func (hc Conn) Read(b []byte) (n int, err error) {
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logger.LogDebug(fmt.Sprintln("** ALERT - detected HMAC mismatch, possible channel tampering **"))
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_, _ = (*hc.c).Write([]byte{CSOHmacInvalid})
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}
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//----------------------------------------------------------
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//------------------- Decrypt Payload ----------------------
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db := bytes.NewBuffer(payloadBytes[:n]) //copying payloadBytes to db
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// The StreamReader acts like a pipe, decrypting
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// whatever is available and forwarding the result
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@ -1289,6 +1300,7 @@ func (hc Conn) Read(b []byte) (n int, err error) {
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// The caller isn't necessarily reading the full payload so we need
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// to decrypt to an intermediate buffer, draining it on demand of caller
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decryptN, err := rs.Read(payloadBytes)
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//----------------------------------------------------------
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if hc.logPlainText {
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log.Printf(" <:ptext:\r\n%s\r\n", hex.Dump(payloadBytes[:n]))
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@ -1297,6 +1309,7 @@ func (hc Conn) Read(b []byte) (n int, err error) {
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log.Println("xsnet.Read():", err)
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//panic(err)
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} else {
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//------------ Discard Padding ---------------------
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// Padding: Read padSide, padLen, (padding | d) or (d | padding)
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padSide := payloadBytes[0]
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padLen := payloadBytes[1]
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@ -1307,15 +1320,17 @@ func (hc Conn) Read(b []byte) (n int, err error) {
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} else {
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payloadBytes = payloadBytes[0 : len(payloadBytes)-int(padLen)]
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}
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//--------------------------------------------------
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switch ctrlStatOp {
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case CSOChaff:
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// Throw away pkt if it's chaff (ie., caller to Read() won't see this data)
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if ctrlStatOp == CSOChaff {
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log.Printf("[Chaff pkt, discarded (len %d)]\n", decryptN)
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} else if ctrlStatOp == CSOTermSize {
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case CSOTermSize:
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fmt.Sscanf(string(payloadBytes), "%d %d", &hc.Rows, &hc.Cols)
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log.Printf("[TermSize pkt: rows %v cols %v]\n", hc.Rows, hc.Cols)
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hc.WinCh <- WinSize{hc.Rows, hc.Cols}
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} else if ctrlStatOp == CSOExitStatus {
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case CSOExitStatus:
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if len(payloadBytes) > 0 {
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hc.SetStatus(CSOType(binary.BigEndian.Uint32(payloadBytes)))
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} else {
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@ -1323,7 +1338,7 @@ func (hc Conn) Read(b []byte) (n int, err error) {
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hc.SetStatus(CSETruncCSO)
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}
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hc.Close()
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} else if ctrlStatOp == CSOTunSetup {
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case CSOTunSetup:
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// server side tunnel setup in response to client
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lport := binary.BigEndian.Uint16(payloadBytes[0:2])
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rport := binary.BigEndian.Uint16(payloadBytes[2:4])
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@ -1335,7 +1350,7 @@ func (hc Conn) Read(b []byte) (n int, err error) {
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logger.LogDebug(fmt.Sprintf("[Server] Got CSOTunSetup [%d:%d]", lport, rport))
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}
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(*hc.tuns)[rport].Ctl <- 'd' // Dial() rport
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} else if ctrlStatOp == CSOTunSetupAck {
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case CSOTunSetupAck:
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lport := binary.BigEndian.Uint16(payloadBytes[0:2])
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rport := binary.BigEndian.Uint16(payloadBytes[2:4])
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if _, ok := (*hc.tuns)[rport]; !ok {
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@ -1346,7 +1361,7 @@ func (hc Conn) Read(b []byte) (n int, err error) {
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logger.LogDebug(fmt.Sprintf("[Client] Got CSOTunSetupAck [%d:%d]", lport, rport))
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}
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(*hc.tuns)[rport].Ctl <- 'a' // Listen() for lport connection
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} else if ctrlStatOp == CSOTunRefused {
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case CSOTunRefused:
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// client side receiving CSOTunRefused means the remote side
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// could not dial() rport. So we cannot yet listen()
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// for client-side on lport.
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@ -1358,7 +1373,7 @@ func (hc Conn) Read(b []byte) (n int, err error) {
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} else {
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logger.LogDebug(fmt.Sprintf("[Client] CSOTunRefused on already-closed tun [%d:%d]", lport, rport))
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}
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} else if ctrlStatOp == CSOTunDisconn {
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case CSOTunDisconn:
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// server side's rport has disconnected (server lost)
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lport := binary.BigEndian.Uint16(payloadBytes[0:2])
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rport := binary.BigEndian.Uint16(payloadBytes[2:4])
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@ -1368,7 +1383,7 @@ func (hc Conn) Read(b []byte) (n int, err error) {
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} else {
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logger.LogDebug(fmt.Sprintf("[Client] CSOTunDisconn on already-closed tun [%d:%d]", lport, rport))
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}
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} else if ctrlStatOp == CSOTunHangup {
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case CSOTunHangup:
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// client side's lport has hung up
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lport := binary.BigEndian.Uint16(payloadBytes[0:2])
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rport := binary.BigEndian.Uint16(payloadBytes[2:4])
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@ -1378,7 +1393,7 @@ func (hc Conn) Read(b []byte) (n int, err error) {
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} else {
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logger.LogDebug(fmt.Sprintf("[Server] CSOTunHangup to already-closed tun [%d:%d]", lport, rport))
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}
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} else if ctrlStatOp == CSOTunData {
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case CSOTunData:
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lport := binary.BigEndian.Uint16(payloadBytes[0:2])
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rport := binary.BigEndian.Uint16(payloadBytes[2:4])
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//fmt.Printf("[Got CSOTunData: [lport %d:rport %d] data:%v\n", lport, rport, payloadBytes[4:])
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@ -1391,7 +1406,7 @@ func (hc Conn) Read(b []byte) (n int, err error) {
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} else {
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logger.LogDebug(fmt.Sprintf("[Attempt to write data to closed tun [%d:%d]", lport, rport))
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}
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} else if ctrlStatOp == CSOTunKeepAlive {
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case CSOTunKeepAlive:
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// client side has sent keepalive for tunnels -- if client
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// dies or exits unexpectedly the absence of this will
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// let the server know to hang up on Dial()ed server rports.
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@ -1402,9 +1417,9 @@ func (hc Conn) Read(b []byte) (n int, err error) {
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t.KeepAlive = 0
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hc.Unlock()
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}
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} else if ctrlStatOp == CSONone {
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case CSONone:
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hc.dBuf.Write(payloadBytes)
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} else {
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default:
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logger.LogDebug(fmt.Sprintf("[Unknown CSOType:%d]", ctrlStatOp))
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}
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}
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