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Connection problem with secured WebSocket on embedded linux

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  • S Offline
    S Offline
    simon_brizard
    wrote on 1 Sept 2017, 09:16 last edited by
    #1

    Hello,

    I have a problem on an application developed on an embedded linux. This application creates a WebSocket server, which is then, used on a WebApp. The version of Qt used is 5.4.1 (We are about to migrate to 5.6.2, but it is not planned for the moment).

    Everything works fine, until I switched on a SSL WebSocket server. Now, with the secured WebSocket, when I try to connect with an IPhone 4S with Chrome, the connection to the WebSocket fails. That's the first problem.

    But the second problem is the one which is really problematic : After the failed connection done with the IPhone, the WebSocket server refuses all the others connections. Only the re-creation of the object QWebSocketServer() can solve the problem (this is not a solution....).

    I have investigated the problem in order to see what is wrong. First of all, after the failed connection, the command "netstat -a" shows that the Receive Queue of the socket increases progressively. It seems to not be unstacked anymore (See the port 9475) :

    ~ # netstat -a
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State
tcp        0      0 0.0.0.0:9474            0.0.0.0:*               LISTEN
tcp       24      0 0.0.0.0:9475            0.0.0.0:*               LISTEN
tcp        0      0 0.0.0.0:www             0.0.0.0:*               LISTEN
tcp        0      0 0.0.0.0:domain          0.0.0.0:*               LISTEN
tcp        0      0 0.0.0.0:ssh             0.0.0.0:*               LISTEN
tcp        0      0 0.0.0.0:https           0.0.0.0:*               LISTEN
tcp        0      0 192.168.86.14:ssh       192.168.86.26:49049     ESTABLISHED
tcp      518      0 192.168.86.14:9475      192.168.86.10:48750     CLOSE_WAIT
tcp      518      0 192.168.86.14:9475      192.168.86.10:48556     CLOSE_WAIT
tcp      518      0 192.168.43.30:9475      192.168.43.186:37746    CLOSE_WAIT
tcp      518      0 192.168.86.14:9475      192.168.86.10:48550     CLOSE_WAIT
tcp      518      0 192.168.43.30:9475      192.168.43.186:38254    CLOSE_WAIT
tcp      518      0 192.168.86.14:9475      192.168.86.10:48534     CLOSE_WAIT
tcp      518      0 192.168.86.14:9475      192.168.86.10:48734     CLOSE_WAIT
tcp      518      0 192.168.86.14:9475      192.168.86.10:48668     CLOSE_WAIT
tcp      518      0 192.168.86.14:9475      192.168.86.10:48674     CLOSE_WAIT
tcp      518      0 192.168.86.14:9475      192.168.86.10:48632     CLOSE_WAIT
tcp      518      0 192.168.43.30:9475      192.168.43.186:37576    CLOSE_WAIT
tcp      518      0 192.168.86.14:9475      192.168.86.10:48590     CLOSE_WAIT
tcp      518      0 192.168.86.14:9475      192.168.86.10:48562     CLOSE_WAIT
tcp      518      0 192.168.43.30:9475      192.168.43.186:38094    CLOSE_WAIT
tcp      181      0 192.168.43.30:9475      192.168.43.100:60188    CLOSE_WAIT
tcp      518      0 192.168.86.14:9475      192.168.86.10:48720     CLOSE_WAIT
tcp      518      0 192.168.86.14:9475      192.168.86.10:48570     CLOSE_WAIT
tcp      518      0 192.168.86.14:9475      192.168.86.10:48726     CLOSE_WAIT
tcp        0      0 192.168.43.30:9475      192.168.43.100:59923    ESTABLISHED
tcp      518      0 192.168.86.14:9475      192.168.86.10:48582     CLOSE_WAIT
tcp      518      0 192.168.43.30:9475      192.168.43.186:37910    CLOSE_WAIT
tcp      518      0 192.168.86.14:9475      192.168.86.10:48576     CLOSE_WAIT
tcp        0      0 192.168.86.14:ssh       192.168.86.10:32777     ESTABLISHED
tcp      518      0 192.168.43.30:9475      192.168.43.186:38586    CLOSE_WAIT
tcp      518      0 192.168.43.30:9475      192.168.43.186:38428    CLOSE_WAIT
tcp      518      0 192.168.86.14:9475      192.168.86.10:48664     CLOSE_WAIT
netstat: /proc/net/tcp6: No such file or directory
udp        0      0 0.0.0.0:34356           0.0.0.0:*
udp        0      0 0.0.0.0:domain          0.0.0.0:*
udp        0      0 0.0.0.0:bootps          0.0.0.0:*
udp        0      0 0.0.0.0:46804           0.0.0.0:*
udp        0      0 0.0.0.0:5353            0.0.0.0:*
netstat: /proc/net/udp6: No such file or directory
netstat: /proc/net/raw6: No such file or directory
Active UNIX domain sockets (servers and established)
Proto RefCnt Flags       Type       State         I-Node Path
unix  2      [ ACC ]     STREAM     LISTENING        809 /tmp/var/run/avahi-daemon/socket
unix  2      [ ]         DGRAM                       600 /var/run/wpa_supplicant/wlan0
unix  12     [ ]         DGRAM                       219 /dev/log
unix  2      [ ]         DGRAM                      1206
unix  2      [ ]         DGRAM                      1181
unix  2      [ ]         DGRAM                      1102
unix  2      [ ]         DGRAM                       919
unix  2      [ ]         DGRAM                       896
unix  2      [ ]         DGRAM                       859
unix  2      [ ]         DGRAM                       821
unix  2      [ ]         DGRAM                       805
unix  2      [ ]         DGRAM                       788
unix  2      [ ]         DGRAM                       689

    Next, I tried to activate the logs in QSslSocket class and QSslSocketBackendPrivate class, in order to see what is wrong. Here are the logs :
    When I succeed in connecting to the Secured WebSocket (for example, with my PC) :

    QSslSocket::QSslSocket( QObject(0x0)  ), this = 0x234608
QSslSocket::setSocketDescriptor( 17 , QAbstractSocket::ConnectedState , OpenMode( "ReadOnly|WriteOnly" ) )
QSslSocket::_q_stateChangedSlot( QAbstractSocket::ConnectedState )
QSslSocket::startServerEncryption()
QSslSocketBackendPrivate::transmit: testing encryption
QSslSocketBackendPrivate::transmit: encryption not done yet
QSslSocket::_q_readyReadSlot() - 517 bytes available
QSslSocketBackendPrivate::transmit: read 517 encrypted bytes from the socket
QSslSocketBackendPrivate::transmit: testing encryption
QSslSocketBackendPrivate::transmit: encryption not done yet
QSslSocketBackendPrivate::transmit: wrote 2090 encrypted bytes to the socket 2090 actual.
QSslSocketBackendPrivate::transmit: testing encryption
QSslSocketBackendPrivate::transmit: encryption not done yet
QSslSocketBackendPrivate::transmit: testing encryption
QSslSocketBackendPrivate::transmit: encryption not done yet
QSslSocket::_q_bytesWrittenSlot( 2090 )
QSslSocket::_q_readyReadSlot() - 126 bytes available
QSslSocketBackendPrivate::transmit: read 126 encrypted bytes from the socket
QSslSocketBackendPrivate::transmit: testing encryption
onNewConnection event
manage one pending connection
Is socket contains data : 
QSslSocketBackendPrivate::transmit: encryption established
QSslSocketBackendPrivate::transmit: wrote 242 encrypted bytes to the socket 242 actual.
QSslSocket::_q_bytesWrittenSlot( 242 )
QSslSocket::_q_errorSlot( QAbstractSocket::RemoteHostClosedError )
	state = QAbstractSocket::ConnectedState
	errorString = "Unknown error"
QSslSocket::_q_stateChangedSlot( QAbstractSocket::ClosingState )
QSslSocket::_q_stateChangedSlot( QAbstractSocket::UnconnectedState )
QSslSocket::_q_disconnectedSlot()
	state = QAbstractSocket::UnconnectedState
QSslSocket::QSslSocket( QObject(0x0)  ), this = 0x240bd0
QSslSocket::setSocketDescriptor( 17 , QAbstractSocket::ConnectedState , OpenMode( "ReadOnly|WriteOnly" ) )
QSslSocket::_q_stateChangedSlot( QAbstractSocket::ConnectedState )
QSslSocket::startServerEncryption()
QSslSocketBackendPrivate::transmit: testing encryption
QSslSocketBackendPrivate::transmit: encryption not done yet
QSslSocket::_q_readyReadSlot() - 517 bytes available
QSslSocketBackendPrivate::transmit: read 517 encrypted bytes from the socket
QSslSocketBackendPrivate::transmit: testing encryption
QSslSocketBackendPrivate::transmit: encryption not done yet
QSslSocketBackendPrivate::transmit: wrote 2090 encrypted bytes to the socket 2090 actual.
QSslSocketBackendPrivate::transmit: testing encryption
QSslSocketBackendPrivate::transmit: encryption not done yet
QSslSocketBackendPrivate::transmit: testing encryption
QSslSocketBackendPrivate::transmit: encryption not done yet
QSslSocket::_q_bytesWrittenSlot( 2090 )
QSslSocket::_q_readyReadSlot() - 126 bytes available
QSslSocketBackendPrivate::transmit: read 126 encrypted bytes from the socket
QSslSocketBackendPrivate::transmit: testing encryption

    When I try to connect with the IPhone :

    QSslSocket::QSslSocket( QObject(0x0)  ), this = 0x233158
QSslSocket::setSocketDescriptor( 17 , QAbstractSocket::ConnectedState , OpenMode( "ReadOnly|WriteOnly" ) )
QSslSocket::_q_stateChangedSlot( QAbstractSocket::ConnectedState )
QSslSocket::startServerEncryption()
QSslSocketBackendPrivate::transmit: testing encryption
QSslSocketBackendPrivate::transmit: encryption not done yet
QSslSocket::_q_readyReadSlot() - 180 bytes available
QSslSocketBackendPrivate::transmit: read 180 encrypted bytes from the socket
QSslSocketBackendPrivate::transmit: testing encryption
QSslSocketBackendPrivate::transmit: encryption not done yet
QSslSocketBackendPrivate::transmit: wrote 2118 encrypted bytes to the socket 2118 actual.
QSslSocketBackendPrivate::transmit: testing encryption
QSslSocketBackendPrivate::transmit: encryption not done yet
QSslSocketBackendPrivate::transmit: testing encryption
QSslSocketBackendPrivate::transmit: encryption not done yet
QSslSocket::_q_bytesWrittenSlot( 2118 )
QSslSocket::_q_errorSlot( QAbstractSocket::RemoteHostClosedError )
	state = QAbstractSocket::ConnectedState
	errorString = "Unknown error"
QSslSocket::_q_stateChangedSlot( QAbstractSocket::ClosingState )
QSslSocket::_q_stateChangedSlot( QAbstractSocket::UnconnectedState )
QSslSocket::_q_disconnectedSlot()
	state = QAbstractSocket::UnconnectedState

    And after that, there is no log anymore when I try to connect with my PC, and the Received Queue of the secured WebSocket increase progressively...

    I don't know what to check. Do you have any hints in order to debug these two issues ?

    1 Reply Last reply
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    • S Offline
      S Offline
      simon_brizard
      wrote on 6 Sept 2017, 07:44 last edited by
      #2

      Hello,

      I have tried with the version 5.6.2 of Qt, but the behaviour is the same. Anyone can help me ?

      Thanks a lot.

      Best regards,

      Simon Brizard

      1 Reply Last reply
      0
      • SGaistS Offline
        SGaistS Offline
        SGaist
        Lifetime Qt Champion
        wrote on 6 Sept 2017, 20:46 last edited by
        #3

        Hi and welcome to devnet,

        Looks like there's something low level going on. I'd recommend bringing that question to the interest mailing list. You'll find there Qt's developers/maintainers. This forum is more user oriented.

        Interested in AI ? www.idiap.ch
        Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

        1 Reply Last reply
        0
        • KutyusK Offline
          KutyusK Offline
          Kutyus
          wrote on 31 Dec 2020, 10:42 last edited by
          #4

          Hi!

          The same problem occurred to me in 5.11.3 framework, maybe there is a solution to it?

          1 Reply Last reply
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