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LibDNS: Make DNS packet parsing fallible

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Previously, a DNS packet containing an invalid name would be returned
with an empty name. With this change, an error is returned if any error
is encountered during parsing.
This commit is contained in:
Tim Ledbetter 2023-11-13 22:36:34 +00:00 • committed by Andreas Kling
parent 95d62822bf
commit 1793f51bc6
8 changed files with 29 additions and 40 deletions
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16
Userland/Services/LookupServer/MulticastDNS.cpp
View file

@ -56,13 +56,7 @@ MulticastDNS::MulticastDNS(Core::EventReceiver* parent)
ErrorOr<void> MulticastDNS::handle_packet()
{
auto buffer = TRY(receive(1024));
auto optional_packet = Packet::from_raw_packet(buffer);
if (!optional_packet.has_value()) {
dbgln("Got an invalid mDNS packet");
return {};
}
auto& packet = optional_packet.value();
auto packet = TRY(Packet::from_raw_packet(buffer));
if (packet.is_query())
handle_query(packet);
return {};
@ -175,12 +169,12 @@ ErrorOr<Vector<Answer>> MulticastDNS::lookup(Name const& name, RecordType record
auto buffer = TRY(receive(1024));
if (buffer.is_empty())
return Vector<Answer> {};
auto optional_packet = Packet::from_raw_packet(buffer);
if (!optional_packet.has_value()) {
dbgln("Got an invalid mDNS packet");
auto packet_or_error = Packet::from_raw_packet(buffer);
if (packet_or_error.is_error()) {
dbgln("Got an invalid mDNS packet: {}", packet_or_error.release_error());
continue;
}
auto& packet = optional_packet.value();
auto packet = packet_or_error.release_value();
if (packet.is_query())
continue;