Callback Example

DB Interface Module User's Guide
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10.6 Callback Example

The following code snippet enables the Sybase Open Client Access Module to use external login authentication. It has a database callback class, UserSybDatabaseCallbackImp, which only redefines the producer method produceConnCallback() to create a new instance of the connection callback class, UserSybConnCallbackImp.

The Connection Callback class, UserSybConnCallbackImp, only redefines the preConnect() callback method to clear the username and password and set various login authentication properties.

This example does not provide an instance of the connection callback class in the method RWDBDatabase::connection(), as it is created from the connCallback() producer method in the UserSybDatabaseCallbackImp class.

/////////////////////////////////////////////////////////////////////
//
// UserSybConnCallbackImp
//
/////////////////////////////////////////////////////////////////////
class UserSybConnCallbackImp : public RWDBConnCallbackImp {
public:
    // Callbacks
    virtual void preConnect();
};


void
UserSybConnCallbackImp::preConnect()
{
    RWDBSybCtLibSystemHandle* sybCtSysH =
            (RWDBSybCtLibSystemHandle*)systemHandle();
    CS_CONNECTION* cs_conn = sybCtSysH->csconn();

    // Clear username and password
    ct_con_props(cs_conn, CS_CLEAR, CS_USERNAME,
                     NULL, CS_UNUSED, (CS_INT *)NULL);
    ct_con_props(cs_conn, CS_CLEAR, CS_PASSWORD,
                     NULL, CS_UNUSED, (CS_INT *)NULL);

    // Apply security services
    CS_BOOL boolval = CS_TRUE;
    ct_con_props(cs_conn, CS_SET, CS_SEC_NETWORKAUTH,
                     &boolval, CS_UNUSED, NULL);
    ct_con_props(cs_conn, CS_SET, CS_SEC_MUTUALAUTH,
                     &boolval, CS_UNUSED, NULL);
    ct_con_props(cs_conn, CS_SET, CS_SEC_CONFIDENTIALITY,
                     &boolval, CS_UNUSED, NULL);
    ct_con_props(cs_conn, CS_SET, CS_SEC_INTEGRITY,
                     &boolval, CS_UNUSED, NULL);
    ct_con_props(cs_conn, CS_SET, CS_SEC_DETECTREPLAY,
                     &boolval, CS_UNUSED, NULL);
    ct_con_props(cs_conn, CS_SET, CS_SEC_DETECTSEQ,
                     &boolval, CS_UNUSED, NULL);
}



/////////////////////////////////////////////////////////////////////
//
// UserSybDatabaseCallbackImp
//
/////////////////////////////////////////////////////////////////////
class UserSybDatabaseCallbackImp : public RWDBDatabaseCallbackImp {
public:
    // Connection callback producer
    virtual RWDBConnCallback produceConnCallback();
};


RWDBConnCallback
UserSybDatabaseCallbackImp::produceConnCallback()
{
    return RWDBCONNCALLBACK(UserSybConnCallbackImp);
}



/////////////////////////////////////////////////////////////////////
//
// main
//
/////////////////////////////////////////////////////////////////////
int main()
{
    RWDBDatabase db = RWDBManager::database(
            "ctl8015d.dll", "server", "", "", "",
            RWDBDATABASECALLBACK(UserSybDatabaseCallbackImp));
    RWDBConnection conn = db.connection();

    return 0;
}

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