[sslh] Add ALPN protocol based probe

[moparisthebest]

Hello again,

This time I'm back with an ALPN probe patch, posted on github here:
https://github.com/yrutschle/sslh/pull/74

This again pulls code from sniproxy[1] like the last patch, but modifies
it even more, and adds support for ALPN probes. Now alpn/sni as a name
mean exactly the same thing, use the same probe, and support the same
options, that is sni_hostnames and/or alpn_protocols, if both are
defined they BOTH must match. sniproxy isn't currently planning on
supporting an AND like that, so that's one more thing sslh will have the
advantage in. :)

With the new structure an SNI hostname is never malloc'd either (no
malloc during probe at all, actually), so there is a speedup there.

Let me know if this needs anything else to be included!

Thanks,
moparisthebest

[1]: https://github.com/dlundquist/sniproxy/blob/alpn/src/tls.c
-------------- next part --------------
A non-text attachment was scrubbed...
Name: 0001-Add-ALPN-protocol-based-probe.patch
Type: text/x-patch
Size: 19622 bytes
Desc: not available
URL: <http://rutschle.net/pipermail/sslh/attachments/20151216/949e8316/attachment-0001.bin>