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
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
|
use std::collections::HashSet;
use std::sync::{Arc, RwLock, RwLockReadGuard};
use anyhow::Result;
use async_trait::async_trait;
use serde::{Deserialize, Serialize};
use crate::locks::RwLockExt;
use crate::transport::EncodedMessage;
use crate::transport::{MessageHandler, ParsedMessage, Transport};
#[derive(Debug, Clone, Default, Serialize, Deserialize)]
pub(crate) struct FirewallRules {
/// Messages from these peers are dropped before the application sees them.
#[serde(default)]
pub(crate) inbound: HashSet<String>,
/// Messages to these peers are silently dropped, like a lossy network.
#[serde(default)]
pub(crate) outbound: HashSet<String>,
}
/// Uses a std lock: checks are tiny and the guard is never held across an await.
#[derive(Default)]
pub(crate) struct Firewall {
rules: RwLock<FirewallRules>,
}
impl Firewall {
fn read(&self) -> RwLockReadGuard<'_, FirewallRules> {
self.rules.read_or_recover()
}
pub(crate) fn rules(&self) -> FirewallRules {
self.read().clone()
}
pub(crate) fn set_rules(&self, rules: FirewallRules) {
*self.rules.write_or_recover() = rules;
}
pub(crate) fn blocks_inbound(&self, peer: &str) -> bool {
self.read().inbound.contains(peer)
}
pub(crate) fn blocks_outbound(&self, peer: &str) -> bool {
self.read().outbound.contains(peer)
}
}
pub(crate) struct FirewallTransport {
inner: Arc<dyn Transport>,
firewall: Arc<Firewall>,
}
impl FirewallTransport {
pub(crate) fn new(inner: Arc<dyn Transport>, firewall: Arc<Firewall>) -> Self {
Self { inner, firewall }
}
}
#[async_trait]
impl Transport for FirewallTransport {
fn local_id(&self) -> &str {
self.inner.local_id()
}
fn is_peer_id(&self, id: &str) -> bool {
self.inner.is_peer_id(id)
}
fn delivery_limit(&self) -> std::time::Duration {
self.inner.delivery_limit()
}
fn local_addresses(&self) -> Vec<String> {
self.inner.local_addresses()
}
fn addresses_of(&self, peer: &str) -> Vec<String> {
self.inner.addresses_of(peer)
}
fn learn_addresses(&self, peer: &str, addresses: &[String]) {
self.inner.learn_addresses(peer, addresses)
}
fn can_reach(&self, peer: &str) -> bool {
self.inner.can_reach(peer)
}
fn discovered_seeds(&self) -> Vec<String> {
self.inner.discovered_seeds()
}
fn transports(&self) -> Vec<String> {
self.inner.transports()
}
async fn resolve_seed(&self, seed: &str) -> Result<String> {
self.inner.resolve_seed(seed).await
}
fn encode(&self, peer: &str, message: &ParsedMessage) -> Result<EncodedMessage> {
self.inner.encode(peer, message)
}
async fn send_encoded(&self, message: &EncodedMessage) -> Result<()> {
if self.firewall.blocks_outbound(&message.peer) {
tracing::trace!(peer = %message.peer, "Firewall dropped outbound message");
return Ok(());
}
self.inner.send_encoded(message).await
}
async fn start_consumer(&self, handler: MessageHandler) -> Result<()> {
let firewall = Arc::clone(&self.firewall);
self.inner
.start_consumer(Box::new(move |sender, message, payload_len| {
if firewall.blocks_inbound(&sender) {
tracing::trace!(peer = %sender, "Firewall dropped inbound message");
return Box::pin(async { Ok(()) });
}
handler(sender, message, payload_len)
}))
.await
}
async fn wait_for_exit(&self) -> std::io::Result<std::process::ExitStatus> {
self.inner.wait_for_exit().await
}
}
|
