QSslSocketPrivate (SecureTransport) - add ALPN support

Starting from iOS 11.0 (SDK) Apple has exposed two new functions:
SSLSetALPNProtocols and SSLCopyALPNProtocols. This allows us to
negotiate http/2 (and any other application layer protocol) via TLS on
iOS. Unlike OpenSSL, SecureTransport's version is very limited - we
have to compare protocols manually after the SSL handshake has
finished. Still, this is better than nothing. These two functions are
also declared in macOS SDK starting from 10.13, but unfortunately the
symbols are missing and for now this feature is only enabled on iOS.

Change-Id: I3ed2f287bfa864f8aca0c231171e804f7d6b8016
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>

0 files changed, 0 insertions, 0 deletions