1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
|
//! Declares a type to configure new streams.
use tor_cell::relaycell::msg::{BeginFlags, IpVersionPreference};
/// A set of preferences used to declare how a new stream should be opened.
#[derive(Clone, Debug, Default)]
pub struct StreamParameters {
/// Preferred IP version to use.
ip_version: IpVersionPreference,
/// True if we are requesting an optimistic stream.
optimistic: bool,
/// True if we are suppressing hostnames
suppress_hostname: bool,
/// True if we are suppressing flags.
suppress_begin_flags: bool,
}
impl StreamParameters {
/// Create a new [`StreamParameters`] using default settings.
pub fn new() -> Self {
Self::default()
}
/// Configure this `StreamParameters` to include no flags in any
/// `BEGIN` message it generates.
///
/// This is used to implement onion services. It may make other
/// operations inoperable.
pub fn suppress_begin_flags(&mut self) -> &mut Self {
self.suppress_begin_flags = true;
self
}
/// Configure this `StreamParameters` to suppress hostnames in the
/// BEGIN messages.
///
/// This is used to implement onion services. It will make other
/// kinds of connections not work.
pub fn suppress_hostname(&mut self) -> &mut Self {
self.suppress_hostname = true;
self
}
/// Configure which IP version (IPv4 or IPv6) you'd like to request,
/// if you're connecting to a hostname.
///
/// The default is to allow either version, but to prefer IPv4.
pub fn ip_version(&mut self, preference: IpVersionPreference) -> &mut Self {
self.ip_version = preference;
self
}
/// Configure whether the stream should be opened "optimistically."
///
/// By default, streams are not "optimistic". When you call
/// [`ClientCirc::begin_stream()`](crate::client::ClientTunnel::begin_stream),
/// the function won't give you a stream until the exit node has
/// confirmed that it has successfully opened a connection to your
/// target address. It's safer to wait in this way, but it is slower:
/// it takes an entire round trip to get your confirmation.
///
/// If a stream _is_ configured to be "optimistic", then
/// `ClientCirc::begin_stream()` will return the stream
/// immediately, without waiting for an answer from the exit. You
/// can start sending data on the stream right away, though of
/// course this data will be lost if the connection is not
/// actually successful.
pub fn optimistic(&mut self, optimistic: bool) -> &mut Self {
self.optimistic = optimistic;
self
}
/// Crate-internal: Return true if the stream is optimistic.
pub(crate) fn is_optimistic(&self) -> bool {
self.optimistic
}
/// Crate-internal: Get a set of [`BeginFlags`] for this stream.
pub(crate) fn begin_flags(&self) -> BeginFlags {
if self.suppress_begin_flags {
0.into()
} else {
self.ip_version.into()
}
}
/// Crate-internal: Return true if we are suppressing hostnames.
pub(crate) fn suppressing_hostname(&self) -> bool {
self.suppress_hostname
}
}
|
