JosiahWI commented on code in PR #9767:
URL: https://github.com/apache/trafficserver/pull/9767#discussion_r1238421948
##########
iocore/net/TLSSNISupport.cc:
##########
@@ -64,8 +67,12 @@ TLSSNISupport::perform_sni_action()
}
SNIConfig::scoped_config params;
- if (const auto &actions = params->get({servername,
std::strlen(servername)}); !actions.first) {
- Debug("ssl_sni", "%s not available in the map", servername);
+ // should always work in this context of SSL action callbacks
+ SSLNetVConnection *ssl_vc{dynamic_cast<SSLNetVConnection *>(this)};
Review Comment:
I took a look this, and I think it might be time to refactor.
```cpp
class SSLNetVConnection : public UnixNetVConnection,
public ALPNSupport,
public TLSSessionResumptionSupport,
public TLSSNISupport,
public TLSEarlyDataSupport,
public TLSTunnelSupport,
public TLSCertSwitchSupport,
public TLSBasicSupport
```
This is where we obtain the TLSSNIConfig:
```cpp
TLSSNISupport *
TLSSNISupport::getInstance(SSL *ssl)
{
return static_cast<TLSSNISupport *>(SSL_get_ex_data(ssl, _ex_data_index));
}
```
and SSLUtils.cc does the actual calls to perform SNI actions, on the
`TLSSNISupport` object it got from this... apparently some global data stored
using OpenSSL? Am I reading that right?
So there's no `SSLNetVConnection` in sight. The only way we can obtain it is
to `dynamic_cast`. You're not the only person who's wrinkled his nose at this:
```cpp
// TODO: change design to avoid this dynamic_cast
auto ssl_vc = dynamic_cast<SSLNetVConnection *>(snis);
```
@masaori335 put in this TODO, maybe he's thought some about how to do this.
I suggest we aim to do the design change in a separate PR, as it will probably
be nontrivial.
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