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Presently, for each UDP packet that we process in `snownet`, we check if we have already seen this local address of ours and if not, add it to our list of host candidates. This is a safe way for ensuring that we consider all addresses that we receive data on as ones that we tell our peers that they should try and contact us on. Performance profiling has shown that hashing the socket address of each packet that is coming in is quite wasteful. We spend about 4-5% of our main thread time doing this. For comparison, decrypting packets is only about 30%. Most of the time, we will already know about this address and therefore, spending all this CPU time is completely pointless. At the same time though, we need to be sure that we do discover our local address correctly. Inspired by STUN, we therefore move this responsibility to the `allocation` module. The `allocation` module is responsible for interacting with our TURN servers and will yield server-reflexive and relay candidates as a result. It also knows, what the local address is that it received traffic on so we simply extend that to yield host candidates as well in addition to server-reflexive and relay candidates. On my local machine, this bumps us across the 3.5 Gbits/sec mark: ``` Connecting to host 172.20.0.110, port 5201 [ 5] local 100.93.174.92 port 57890 connected to 172.20.0.110 port 5201 [ ID] Interval Transfer Bitrate Retr Cwnd [ 5] 0.00-1.00 sec 319 MBytes 2.67 Gbits/sec 18 548 KBytes [ 5] 1.00-2.00 sec 413 MBytes 3.46 Gbits/sec 4 884 KBytes [ 5] 2.00-3.00 sec 417 MBytes 3.50 Gbits/sec 4 1.10 MBytes [ 5] 3.00-4.00 sec 425 MBytes 3.56 Gbits/sec 415 785 KBytes [ 5] 4.00-5.00 sec 430 MBytes 3.60 Gbits/sec 154 820 KBytes [ 5] 5.00-6.00 sec 434 MBytes 3.64 Gbits/sec 251 793 KBytes [ 5] 6.00-7.00 sec 436 MBytes 3.66 Gbits/sec 123 811 KBytes [ 5] 7.00-8.00 sec 435 MBytes 3.65 Gbits/sec 2 788 KBytes [ 5] 8.00-9.00 sec 423 MBytes 3.55 Gbits/sec 0 1.06 MBytes [ 5] 9.00-10.00 sec 433 MBytes 3.63 Gbits/sec 8 1017 KBytes - - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bitrate Retr [ 5] 0.00-20.00 sec 8.21 GBytes 3.53 Gbits/sec 1728 sender [ 5] 0.00-20.00 sec 8.21 GBytes 3.53 Gbits/sec receiver iperf Done. ```
Connlib
Firezone's connectivity library shared by all clients.
Building Connlib
You shouldn't need to build connlib directly; it's typically built as a dependency of one of the other Firezone components. See READMEs in those directories for relevant instructions.