If a valid escape (\n, \s, or \\) is found, increment the pointer
marking the start of the next search so we don't start looking at the
escaped character. The old behaviour was a problem for messages
containing slashes -- the escaped slash would be looked at in the next
pass and so the following character would be treated as an escape,
causing the message to be dropped for having "an invalid ADC escape".
uhub did not have this security bug since the hub did not advertise support for the
UCMD extension, but the message was still correctly relayed as specified in the
protocol specification.
However, this commit adds support for the UCMD extension, but only to the extent
that uhub will advertise it and uhub will also drop any such CMD message
generated by a client and will (currently) never issues a CMD message by itself.
GnuTLS sends a handshake with SSL 3.0 (0x0300) in the outer packet, but
mentions TLS 1.2 (0x0303) in the Client Hello. There's no real need for
uhub to validate these fields, as OpenSSL should do that itself already.
Just use the version mentioned in Client Hello for logging output.
It's not called anywhere yet.
Also reorder some typedefs, rename the ip check functions and add
struct {hub,plugin}_user parameter to on_check_ip_late(). Not sure where
to insert a call to that...
A struct plugin_hub_internals was falsely casted to struct
plugin_callback_data. This caused the contained commands list pointer to point to
a struct hub_info and commands->size took the value of a pointer to a struct
net_connection. Since size is increased/decreased every time an item is
added to/removed from the list, this resulted in some funny crashes.
This fix is a little dirty as it exports some internals.
Assuming the argument definition "?xy", it was previously not possible
to specify only x. Also, the syntax will now be shown as "[x [y]]"
instead of "[x] [y]".
