HGKeeper

Implement SNI support for the gnutls SSL plugin.
release-2.x.y
2019-12-16, Mihai Moldovan

6dba8046e1b1

Implement SNI support for the gnutls SSL plugin.

Note that gnutls is picky in regard to what it accepts as the server name - it
MUST be a domain name. IP addresses are not supported according to the
documentation.

Hence, filter out IP addresses and hope that whatever is not recognized as
such an address is actually a domain name. This will probably fail for more
exotic addresses (especially in IPv6 realm), but wiring up a full-blown parser
is too much effort and SSL plugins are not part of purple-3 anyway.

Fixes #17300

/** @page cipher-signals Cipher Signals

@signals

@signal cipher-added

@signal cipher-removed

@endsignals

@see cipher.h

<hr>

@signaldef cipher-added

@signalproto

void (*cipher_added)(PurpleCipher *cipher);

@endsignalproto

@signaldesc

Emitted when a cipher is added.

@param cipher The cipher that was added.

@endsignaldef

@signaldef cipher-removed

@signalproto

void (*cipher_removed)(PurpleCipher *cipher);

@endsignalproto

@signaldesc

Emitted when a cipher is removed.

@param cipher The cipher that was removed.

@endsignaldef

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