Hi was wondering if anybody understands this problem I am seeing.
I have a simple SSL client and server. Connection is fine. Communication is fine. When the client disconnects the server needs to delete the QSslSocket object, I would imagine. However when I do that the server seg faults. I don’t understand what’s going on. I expected this to be really straightforward but apparently i missing some QT (or other) concept.
Can anybody help out? Thanks
Essential server code:
void SSLServer::incomingConnection(int sd)
{
sslSocket = new SSLSocket(this);
if( sslSocket->setSocketDescriptor(sd))
{
QFile sslkeyfile(privKey_);
sslSocket->setPrivateKey(QSslKey(sslkeyfile.readAll(),QSsl::Rsa));
QFile cliCertFile(serverCert_);
sslSocket->setLocalCertificate(QSslCertificate(cliCertFile.readAll()));
QFile certFile(caCert_);
sslSocket->addCaCertificate(QSslCertificate(certFile.readAll()));
sslSocket->setPeerVerifyMode(QSslSocket::VerifyPeer);
sslSocket->setPeerVerifyDepth(1);
sslSocket->setProtocol(QSsl::SslV3);
connect(sslSocket, SIGNAL(error(QAbstractSocket::SocketError)),
this, SLOT(error_handler(QAbstractSocket::SocketError)));
connect(sslSocket, SIGNAL(sslErrors(QList<QSslError>)),
this, SLOT(ssl_error_handler(QList<QSslError>)));
connect(sslSocket, SIGNAL(encrypted()), this,
SLOT(ready()));
connect(sslSocket, SIGNAL(readyRead()), this,
SLOT(read_data_from_client()));
sslSocket->startServerEncryption();
if(!sslSocket->waitForEncrypted())
{
qDebug() << "failed to perform SSL handshake with client";
QList<QSslCertificate> caChain = sslSocket->caCertificates();
return;
}
}
}
void SSLServer::read_data_from_client()
{
QByteArray qstrbytes = sslSocket->readAll();
qDebug() << Q_FUNC_INFO << qstrbytes;
}
void SSLServer::ready()
{
QSslCertificate clientCert = sslSocket->peerCertificate();
qDebug() << clientCert.isValid();
}
void SSLServer::error_handler(QAbstractSocket::SocketError in_error)
{
qDebug() << Q_FUNC_INFO << in_error;
if(in_error == QAbstractSocket::RemoteHostClosedError)
{
delete sslSocket; //// line causes crash !!!!!!!!!!
}
}
The seg fault happens here in QT’s own QAbstractSocketPrivate::resetSocketLayer().
socketEngine is invalid, garbage pointer, But what am I supposed to do about it.
void QAbstractSocketPrivate::resetSocketLayer()
{
#if defined (QABSTRACTSOCKET_DEBUG)
qDebug("QAbstractSocketPrivate::resetSocketLayer()");
#endif
if (socketEngine) {
socketEngine->close(); //// right here crash happens!!!
socketEngine->disconnect();
delete socketEngine;
socketEngine = 0;
cachedSocketDescriptor = -1;
}
if (connectTimer)
connectTimer->stop();
if (disconnectTimer)
disconnectTimer->stop();
}
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