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[mdns] Split response packets if necessary. (#1877)

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* [mdns] Split response packets.

Prevent MDNS response packets becoming too large by creating
multi-packet responses. Also skip addresses that don't fit
into a TXT record or contain invalid characters.

* Update protocols/mdns/src/dns.rs

Co-authored-by: Max Inden <mail@max-inden.de>

* Refactor response packet construction.

* Update mdns changelog.

Co-authored-by: Max Inden <mail@max-inden.de>
This commit is contained in:
Roman Borschel
2020-12-08 11:47:35 +01:00
committed by GitHub
parent e665a818d7
commit 4c1657ea0f
5 changed files with 142 additions and 93 deletions
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7
protocols/mdns/src/behaviour.rs
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@ -199,13 +199,14 @@ impl NetworkBehaviour for Mdns {
MdnsPacket::Query(query) => {
// MaybeBusyMdnsService should always be Free.
if let MdnsBusyWrapper::Free(ref mut service) = self.service {
let resp = build_query_response(
for packet in build_query_response(
query.query_id(),
params.local_peer_id().clone(),
params.listened_addresses().into_iter(),
MDNS_RESPONSE_TTL,
);
service.enqueue_response(resp.unwrap());
) {
service.enqueue_response(packet)
}
} else { debug_assert!(false); }
},
MdnsPacket::Response(response) => {