Stream forward on the client-side TCP connection gets set up within in
initial_client_data_handler (which also handles reading the initial
stream version byte).
Also fix a potential transmission delay because `again()` wasn't being
called when the expiry is already passed (i.e. meaning we should run
immediately).
Make stream closing with expiring connections work better. Fixes an
issue where the stream's uv_async could outlive the stream and/or
connection and segfault.
In the standalone plainquic code we triggered a retransmit when the
socket became writeable again, but that doesn't work here, so just
schedule it right away to let ngtcp2 worry about retrying.
For now we still steal buffers from uvw.
In the future I'd like to change that, but it's still uvw
work-in-progress to support custom data allocators, and so for now we
still steal data buffers from uvw.
ngtcp2 was rejecting them because we have the port when constructing,
but then it was 0 on the return packet (which ngtcp2 drops because it's
coming from an unknown/invalid path).
* wire up last of the quic stuff
* clean up udp packet generation code
* pass EndpointBase not quic tunnel for quic stuff
* add {n,h}uint16_t::FromString
* add nuint_t::FromString
* make AlignedBuffer::IsZero non constant time call for speed
Refactors how quic packets get handled: the actual tunnels now live in
tunnel.hpp's TunnelManager which holds and manages all the quic<->tcp
tunnelling. service::Endpoint now holds a TunnelManager rather than a
quic::Server. We only need one quic server, but we need a separate quic
client instance per outgoing quic tunnel, and TunnelManager handles all
that glue now.
Adds QUIC packet handling to get to the right tunnel code. This
required multiplexing incoming quic packets, as follows:
Adds a very small quic tunnel packet header of 4 bytes:
[1, SPORT, ECN] for client->server packets, where SPORT is our
source "port" (really: just a uint16_t unique quic instance
identifier)
or
[2, DPORT, ECN] for server->client packets where the DPORT is the SPORT
from above.
(This also reworks ECN bits to get properly carried over lokinet.)
We don't need a destination/source port for the server-side because
there is only ever one quic server (and we know we're going to it when
the first byte of the header is 1).
Removes the config option for quic exposing ports; a full lokinet will
simply accept anything incoming on quic and tunnel it to the requested
port on the the local endpoint IP (this handler will come in a following
commit).
Replace ConvoTags with full addresses: we need to carry the port, as
well, which the ConvoTag can't give us, so change those to more general
SockAddrs from which we can extract both the ConvoTag *and* the port.
Add a pending connection queue along with new quic-side handlers to call
when a stream becomes available (TunnelManager uses this to wire up
pending incoming conns with quic streams as streams open up).
Completely get rid of tunnel_server/tunnel_client.cpp code; it is now
moved to tunnel.hpp.
Add listen()/forget() methods in TunnelManager for setting up quic
listening sockets (for liblokinet usage).
Add open()/close() methods in TunnelManager for spinning up new quic
clients for outgoing quic connections.
They were failing to compile if output because implicit integer
promotion doesn't work for std::byte's (but rather needs an explicit
std::to_integer call).
