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use std::net::SocketAddrV4;
use tracing::{debug, trace};
use crate::{
MutableItem, Node,
common::{
GetImmutableResponseArguments, GetMutableResponseArguments, GetPeersResponseArguments,
GetSignedPeersResponseArguments, Id, Message, NoMoreRecentValueResponseArguments,
NoValuesResponseArguments, RequestTypeSpecific, ResponseSpecific, SignedAnnounce,
messages::MessageType, validate_immutable,
},
core::{Response, supports_signed_peers},
};
use super::Core;
impl Core {
pub(crate) fn handle_response(
&mut self,
from: SocketAddrV4,
message: Message,
) -> Option<(Id, Response)> {
// If someone claims to be readonly, then let's not store anything even if they respond.
if message.read_only {
return None;
};
// If the response looks like a Ping response, check StoreQueries for the transaction_id.
if let Some(query) = self
.put_queries
.values_mut()
.find(|query| query.inflight(message.transaction_id))
{
match message.message_type {
MessageType::Response(ResponseSpecific::Ping(_)) => {
// Mark storage at that node as a success.
query.success();
}
MessageType::Error(error) => query.error(error),
_ => {}
};
return None;
}
let mut should_add_node = false;
let author_id = message.get_author_id();
let from_version = message.version.to_owned();
// Get corresponding query for message.transaction_id
if let Some(query) = self
.iterative_queries
.values_mut()
.find(|query| query.inflight(message.transaction_id))
{
// KrpcSocket would not give us a response from the wrong address for the transaction_id
should_add_node = true;
if let Some(nodes) = message.get_closer_nodes() {
for node in nodes {
query.add_candidate(node.clone());
}
}
if let Some((responder_id, token)) = message.get_token() {
query.add_responding_node(Node::new_with_token(responder_id, from, token.into()));
}
if let Some(proposed_ip) = message.requester_ip {
query.add_address_vote(proposed_ip);
}
let target = query.target();
match message.message_type {
MessageType::Response(ResponseSpecific::GetPeers(GetPeersResponseArguments {
values,
..
})) => {
let response = Response::Peers(values);
query.response(from, response.clone());
return Some((target, response));
}
MessageType::Response(ResponseSpecific::GetSignedPeers(
GetSignedPeersResponseArguments {
responder_id,
peers,
..
},
)) => {
let mut verified_peers = vec![];
let mut malicious = false;
for (k, t, sig) in peers {
if let Ok(peer) = SignedAnnounce::from_dht_response(&target, &k, t, &sig) {
verified_peers.push(peer);
} else {
malicious = true;
break;
}
}
if malicious {
debug!(
?from,
?responder_id,
?from_version,
"Invalid signed announce record"
);
should_add_node = false;
} else {
let response = Response::SignedPeers(verified_peers);
query.response(from, response.clone());
return Some((target, response));
}
}
MessageType::Response(ResponseSpecific::GetImmutable(
GetImmutableResponseArguments {
v, responder_id, ..
},
)) => {
if validate_immutable(&v, query.target()) {
let response = Response::Immutable(v);
query.response(from, response.clone());
return Some((target, response));
}
let target = query.target();
debug!(
?v,
?target,
?responder_id,
?from,
?from_version,
"Invalid immutable value"
);
}
MessageType::Response(ResponseSpecific::GetMutable(
GetMutableResponseArguments {
v,
seq,
sig,
k,
responder_id,
..
},
)) => {
let salt = match query.request.request_type.clone() {
RequestTypeSpecific::GetValue(args) => args.salt,
_ => None,
};
let target = query.target();
match MutableItem::from_dht_message(query.target(), &k, v, seq, &sig, salt) {
Ok(item) => {
let response = Response::Mutable(item);
query.response(from, response.clone());
return Some((target, response));
}
Err(error) => {
debug!(
?error,
?from,
?responder_id,
?from_version,
"Invalid mutable record"
);
}
}
}
MessageType::Response(ResponseSpecific::NoMoreRecentValue(
NoMoreRecentValueResponseArguments {
seq, responder_id, ..
},
)) => {
trace!(
target= ?query.target(),
salt= ?match query.request.request_type.clone() {
RequestTypeSpecific::GetValue(args) => args.salt,
_ => None,
},
?seq,
?from,
?responder_id,
?from_version,
"No more recent value"
);
}
MessageType::Response(ResponseSpecific::NoValues(NoValuesResponseArguments {
responder_id,
..
})) => {
trace!(
target= ?query.target(),
salt= ?match query.request.request_type.clone() {
RequestTypeSpecific::GetValue(args) => args.salt,
_ => None,
},
?from,
?responder_id,
?from_version ,
"No values"
);
}
MessageType::Error(error) => {
debug!(?error, ?from_version, "Get query got error response");
}
// Ping response is already handled in add_node()
// FindNode response is already handled in query.add_candidate()
// Requests are handled elsewhere
MessageType::Response(ResponseSpecific::Ping(_))
| MessageType::Response(ResponseSpecific::FindNode(_))
| MessageType::Request(_) => {}
};
};
if should_add_node {
// Add a node to our routing table on any expected incoming response.
if let Some(id) = author_id {
self.routing_table.add(Node::new(id, from));
if supports_signed_peers(message.version) {
self.signed_peers_routing_table.add(Node::new(id, from));
}
}
}
None
}
}