-DSOCKS_HOST_TEST and -DSOCKS_PORT_TEST for testing

[emdee-is]

The ctest suite has never been run under a proxy. Could you add SOCKS_HOST_TEST and SOCKS_PORT_TEST for testing in auto_tests/auto_test_support.c - should be straightforward.

(And rename USE_IPV6 to USE_IPV6_TESTS while you're in there.)

[emdee-is]

Settable from CMakeCache.txt would be nice so you don't have to recompile the library, or is that defacto already the case?

[Green-Sky]

there needs to be another way. There is a proxy specific test, that tests the proxy functionality. If you think it is missing coverage, that test should be expanded instead.

[emdee-is]

Can you point me to the "proxy specific test, that tests the proxy functionality."? if it does what I'm asking here, I'll close this issue, but I can't see anything real in being in the ctests if it doesn't have a proxy server running during the tests.

I think you're right: there needs to be another way. Turns out there is and iphy showed me how to spin up a VM with ipv6.disable=1 in Docker and then run tests using in Docker under qemu. But there is work to be done get apt to use the proxy.

I tried to pull things altogeter on #2473

[Green-Sky]

https://github.com/TokTok/c-toxcore/blob/master/auto_tests/proxy_test.c

does not look exhaustive, but it is there.

edit: this explains why it is not run on your machine:

c-toxcore/CMakeLists.txt

Lines 125 to 128 in 24b5472

	if (AUTOTEST)
	option(NON_HERMETIC_TESTS "Whether to build and run tests that depend on an internet connection" OFF)
	option(PROXY_TEST "Enable proxy test (needs HTTP/SOCKS5 proxy on port 8080/8081)" OFF)
	endif()

[emdee-is]

Thanks - I've run it in the past, but came to the conclusion that a single call to tox_add_tcp_relay is a test of whether that call works and that's it. I don't think that is a test of whether the program connected to the network and the proxy works.

In real life I find that tox_add_tcp_relay always returns true, even if the SOCKS proxy is not connected to the internet (wifi down). My toxygen code randomly picks 6 BS nodes and tox_add_tcp_relay them all, and then checks dht_connected, repeated every 5? seconds for up to 120? seconds. It's very rare to get the dht_connected in less than 30 seconds, more normal would be 45.

Check what tox_add_tcp_relay and if it ever fails, but AFAIK this is a test of minimal use. The testing case over SOCKS gets harder for things like group_join; there on a fresh group, it's more like 45 minutes, and more likely to have a code failure than tox_add_tcp_relay as it changes often.

[emdee-is]

While you're doing the socks flags, -DUSE_UDP_TEST should be added too, to make sure it's not evading tcp.

[emdee-is]

Regarding https://github.com/TokTok/c-toxcore/blob/master/auto_tests/proxy_test.c I wrote in #2469 (comment)

but came to the conclusion that a single call to tox_add_tcp_relay is a test of whether that call works and that's it. I don't think that is a test of whether the program connected to the network and the proxy works.

Looking at the code to tox_add_tcp_relay in tox.c, as long as the relay host resolves, it doesn't even look for failure from add_tcp_relay:

        add_tcp_relay(tox->m->net_crypto, &root[i], public_key);

which is what I see in practice.

In the testsuite case it will never fail because the nodes it tests against are on localhost, which will always resolve. In other words, Tox's test of a tcp SOCKS proxy will always pass.

PS: Dear Santa: A version of add_tcp_relay that loops through a set of tcp nodes and loops until dht_connected is true is very high on my wish list.

[emdee-is]

@Green-Sky now that the IPV6 problem has been fixed (thanks), I can see that the one-and-only proxy ctest never tests Tox behind a firewalling proxy and the one-and-only proxy ctest test always fails. It has to fail: it starts a socks proxy written in go that is behind a firewall with no information on the outside-of-ctesrt proxy IP:port. So there is no testing of a proxy in Tox that's firewalled - at all. Note that Tox does not yet support corporate proxies #1682

There's a blindspot in the project by relying on ctest. If the project supported Python bindings TokTok/py-toxcore-c#78 (comment) then it would be easier to use a proxy-aware testrunner written in Python: https://git.plastiras.org/emdee/toxygen_wrapper/src/branch/main/src/tox_wrapper/tests/tests_wrapper.py

[Green-Sky]

"proxy behind a firewall" - can you explain what that even means?

the proxy test requires the test-proxy executable as parameter, which is started as an extra thread and provides both http and socks5 for the localhost test.

the get back the the "firewalled" point, no where here should any traffic leave the system. (they dont bootstrap off the internet, but agains each other).

also worth mentioning: the cmake/ctest proxy test does not work, as it does not supply the needed proxy executable as cli argument.

c-toxcore/auto_tests/BUILD.bazel

Lines 32 to 34 in e202341

	extra_args = {
	"proxy_test": ["$(location //c-toxcore/other/proxy)"],
	}

[emdee-is]

"proxy behind a firewall" - can you explain what that even means?

I run a Tor proxy and I also run firewall rules that's what I call "proxy behind a firewall" . I could run a proxy without a firewall. The proxy test assumes there is no firewall.

the proxy test requires the test-proxy executable as parameter, which is started as an extra thread and provides both http and socks5 for the localhost test.

I could run the proxy test without being behind a firewall.

the get back the the "firewalled" point, no where here should any traffic leave the system. (they dont bootstrap off the internet, but agains each other).

The proxy test assumes there is _no firewall against the proxy.

also worth mentioning: the cmake/ctest proxy test does not work, as it does not supply the needed proxy executable as cli argument.

I missed that. But if you look in the Dockerfiles I think I saw it compiling a SOCKS proxy written in go and uses that. But that still assumes there is no firewall against the proxy. So it may work in a CI setup, and fail in the ctesting I was talking about which is me testing the "proxy test behind a firewall".

Of course it is an expected failure as I didn't provide it with the go compiled proxy :-,( so I'll go back to disabling that test, or provide it that proxy.

So back to the original feature request: my theory is that if we add -DSOCKS_HOST_TEST and -DSOCKS_PORT_TEST for testing
to the ToxOptions then the tests would run over the SOCKS proxy.
Then we could get the results of all of the ctests "behind a firewall".

[Green-Sky]

I don't get it. A firewall is setup at a network boundary. But the proxy test has no network boundaries, so a firewall would not come close the any traffic happening at the testcase...

the proxy test sets up tox1, which has udp and tcp enabled (not bootstrapped)
tox2 is also a "regular" node with udp and tcp enabled. It is bootstrapped off of tox1.
tox3 is tcp only and uses the http proxy to bootstrap off of tox1.
tox4 is the same as tox3 but using the socks proxy.

everything is happening localhost, how would a firewall against a proxy work here? and what would it do?