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crate::ix!();
impl PeerManager {
pub fn process_getaddr_message(self: Arc<Self>,
peer: &mut Option<Peer>,
pfrom: &mut AmoWriteGuard<Box<dyn NodeInterface>>,
msg_type: &str,
recv: &mut DataStream,
time_received: &OffsetDateTime /* micros */,
interrupt_msg_proc: &AtomicBool) {
let mut peer = peer.as_mut().unwrap();
// This asymmetric behavior for inbound
// and outbound connections was introduced
// to prevent a fingerprinting attack: an
// attacker can send specific fake
// addresses to users' AddrMan and later
// request them by sending getaddr
// messages.
//
// Making nodes which are behind NAT and
// can only make outgoing connections
// ignore the getaddr message mitigates
// the attack.
if !pfrom.is_inbound_conn() {
log_print!(
LogFlags::NET,
"Ignoring \"getaddr\" from %s connection. peer=%d\n",
pfrom.connection_type_as_string(),
pfrom.get_id()
);
return;
}
// Since this must be an inbound
// connection, SetupAddressRelay will
// never fail.
assume!(
self.clone()
.setup_address_relay(&***pfrom, &mut peer)
);
// Only send one GetAddr response per
// connection to reduce resource waste and
// discourage addr stamping of INV
// announcements.
if peer.getaddr_recvd {
log_print!(
LogFlags::NET,
"Ignoring repeated \"getaddr\". peer=%d\n",
pfrom.get_id()
);
return;
}
peer.getaddr_recvd = true;
peer.addrs_to_send.lock().clear();
let mut addr: Vec<Address> = vec![];
if pfrom.has_permission(NetPermissionFlags::Addr) {
addr = self.connman.get().get_addresses(
MAX_ADDR_TO_SEND,
MAX_PCT_ADDR_TO_SEND,
/* network */ None
);
} else {
addr = self.connman.get_mut().get_addresses_with_requestor(
pfrom,
MAX_ADDR_TO_SEND,
MAX_PCT_ADDR_TO_SEND
);
}
let mut insecure_rand = FastRandomContext::default();
for addr in addr.iter() {
peer.push_address(
addr,
&mut insecure_rand
);
}
}
}