[Qt-creator] Downloading Kate Highlighter Definitions

[Eike Ziller]

> On Sep 24, 2018, at 20:12, Jochen Becher <jochen_becher at gmx.de> wrote:
> 
> Hi,
> 
> QtCreator says "SSL is not supported". But I have packages libssl1.0.0,
> libssl1.1 and openssl installed on Ubuntu 18.04. Anything I miss?

As far as I remember the issue basically boils down to:
If Qt doesn’t find the _exact_ versions of libssl/crypto that Qt was compiled against (includes patch level), it first tries to find libssl/crypto without any version number in the file name, and then it loads the highest libssl/crypto that is on the system, even if Qt was compiled against 1.0 and 1.0 is installed on the system.

Code is in http://code.qt.io/cgit/qt/qtbase.git/tree/src/network/ssl/qsslsocket_openssl_symbols.cpp#n748 (loadOpenSsl)
A workaround for you could be to create symlinks libssl.so / libcrypto.so to your 1.0 libs.

> Why doesn't Qt or QtCreator deliver their own packages if finding a
> system install is difficult?

It is not really that difficult, it is just broken in Qt ;) https://bugreports.qt.io/browse/QTBUG-68971
Qt could also just try loading all libraries in order newest to oldest, and just take whatever succeeds loading…

When we start shipping OpenSSL we start being responsible for security issues in it.

But what we should do is better reporting to the user, and possibly asking the user if we should fall back to trying http in that case.

Br, Eike

> 
> System Information:
> 
> qt.network.ssl: QSslSocket: cannot resolve CRYPTO_num_locks
> qt.network.ssl: QSslSocket: cannot resolve CRYPTO_set_id_callback
> qt.network.ssl: QSslSocket: cannot resolve CRYPTO_set_locking_callback
> qt.network.ssl: QSslSocket: cannot resolve ERR_free_strings
> qt.network.ssl: QSslSocket: cannot resolve EVP_CIPHER_CTX_cleanup
> qt.network.ssl: QSslSocket: cannot resolve EVP_CIPHER_CTX_init
> qt.network.ssl: QSslSocket: cannot resolve sk_new_null
> qt.network.ssl: QSslSocket: cannot resolve sk_push
> qt.network.ssl: QSslSocket: cannot resolve sk_free
> qt.network.ssl: QSslSocket: cannot resolve sk_num
> qt.network.ssl: QSslSocket: cannot resolve sk_pop_free
> qt.network.ssl: QSslSocket: cannot resolve sk_value
> qt.network.ssl: QSslSocket: cannot resolve SSL_library_init
> qt.network.ssl: QSslSocket: cannot resolve SSL_load_error_strings
> qt.network.ssl: QSslSocket: cannot resolve SSL_get_ex_new_index
> qt.network.ssl: QSslSocket: cannot resolve SSLv3_client_method
> qt.network.ssl: QSslSocket: cannot resolve SSLv23_client_method
> qt.network.ssl: QSslSocket: cannot resolve SSLv3_server_method
> qt.network.ssl: QSslSocket: cannot resolve SSLv23_server_method
> qt.network.ssl: QSslSocket: cannot resolve X509_STORE_CTX_get_chain
> qt.network.ssl: QSslSocket: cannot resolve
> OPENSSL_add_all_algorithms_noconf
> qt.network.ssl: QSslSocket: cannot resolve
> OPENSSL_add_all_algorithms_conf
> qt.network.ssl: QSslSocket: cannot resolve SSLeay
> qt.network.ssl: Incompatible version of OpenSSL
> 
> Regards, Jochen
> 
> 
> Am Montag, den 24.09.2018, 06:52 +0000 schrieb Eike Ziller:
>>> On 21. Sep 2018, at 20:19, Jochen Becher <jochen_becher at gmx.de>
>>> wrote:
>>> 
>>> Hi,
>>> 
>>> Downloading Kate Highlighter definitions fails for me in Qt Creator
>>> 4.7.0. I get an error dialog: "Error connection to server" / "Not
>>> possible to retrieve data.".
>>> 
>>> I checked the URL that is used (at least what my source code from
>>> git/master says: "https://www.kate-editor.org/syntax/update-5.60.xm
>>> l")
>>> and it seems to be fine.
>>> 
>>> Known Issue?
>> 
>> My guess:
>> Since it’s trying to use https, Qt needs to find OpenSSL (on
>> Lin/Win). Qt’s method for finding that is not failsafe (to say the
>> least), and it also isn’t made easy with the various incompatible
>> versions of it.
>> I think Help > System Information from Qt Creator’s menu should show
>> you some information about if and what SSL library is found.
>> 
>> -- 
>> Eike Ziller
>> Principal Software Engineer
>> 
>> The Qt Company GmbH
>> Rudower Chaussee 13
>> D-12489 Berlin
>> eike.ziller at qt.io
>> http://qt.io
>> Geschäftsführer: Mika Pälsi,
>> Juha Varelius, Mika Harjuaho
>> Sitz der Gesellschaft: Berlin, Registergericht: Amtsgericht
>> Charlottenburg, HRB 144331 B
>> 

-- 
Eike Ziller
Principal Software Engineer

The Qt Company GmbH
Rudower Chaussee 13
D-12489 Berlin
eike.ziller at qt.io
http://qt.io
Geschäftsführer: Mika Pälsi,
Juha Varelius, Mika Harjuaho
Sitz der Gesellschaft: Berlin, Registergericht: Amtsgericht Charlottenburg, HRB 144331 B