Require explicit seeds for `Simulation` and `SimulatedEnvironment` to
ensure reproducible test results.
Also:
- Drop packets in `FakeUdpSocket` when the receive queue is full to
prevent unbounded memory growth during stress tests.
- Improve synchronization in `Simulation::run_until` by adding a timeout
to the barrier wait, preventing hangs if a runner is unregistered.
This test ensures that multiple priority packets added to a
`TCP_Connection` while the socket is busy are correctly queued in the
linked list without dropping intermediate packets.
Specifically, it protects against regressions where updating the tail
pointer incorrectly (e.g., using the head pointer as a base for append)
would result in data loss. This was identified as a risk in PR #2387.
Move core networking types and the Network interface to net, and the
standard OS socket implementation to os_network. Update network to use
these new abstractions.
- Add `MpscQueue` for thread-safe task scheduling.
- Add `ToxRunner` to execute Tox instances in dedicated threads.
- Update `Simulation` to coordinate time steps across multiple runners using a synchronization barrier.
- Refactor `FakeMemory` and `FakeClock` to be thread-safe.
- Update `tox_network` helpers and tests to utilize the threaded runner infrastructure.
Introduces a new testing support library 'testing/support' that provides
a clean, modular, and fully deterministic environment for testing
toxcore components.
Replaces the use of the platform-specific `Network_Addr` in the public
`Network_Funcs` interface with the platform-independent `IP_Port`
struct, allowing higher-level abstractions (like simulated networks for
testing) to interact with the network layer without needing to depend on
or mock low-level OS socket headers.
Allows clients to prevent leaking IP addresses through DNS lookups. This
option, together with disabling Tox UDP, entirely prevents any UDP
packets being sent by toxcore.
It makes no sense to include it in the public API as clients can't make
any meaningful use of it via public API, it can only be used if one also
includes other internal/private headers that we don't install.
It's used only in the testing code, which has access to the internal
headers.
Fixes#2739, at least to some degree. I decided against moving things to
a separate `tox_testing.h` and leaving only things in `tox_private.h`
that we are fine with clients using, as otherwise `tox_lock()` /
`tox_unlock()` would have to be moved out of `tox_private.h` to
somewhere else, but `tox_private.h` actually sounds like the right place
for them, naming-wise. So perhaps it's fine if we have things in
`tox_private.h` that we don't want clients to use.
These programs link against libsodium, which already provides bin-to-hex
and hex-to-bin conversion functions. Removing the misc_tools dependency
shaves ~30KiB (in some cases 10%) off Windows static binaries using it.
Sparse checks it. This is neater than using a struct, which has some
slightly weird syntax at times. This also reduces the risk of someone
adding another struct member.
These are more convenient and safer than the manual vtables we have in
the fuzzer support code. We can override individual member functions,
and C++ will take care of correctly casting and offsetting this-pointers
when needed.
So we don't need to write so many edge case tests ourselves for things
like parsers, which really don't need those manual tests, as long as we
can check for some properties like "can output the parsed data and it'll
be the same as the input".
