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Use a deterministic PRNG in test_circuit_timeout()
I'd prefer not to do this for randomized tests, but as things stand with this test, it produces nondeterministic test coverage. Closes ticket 25995; bugfix on 0.2.2.2-alpha when this test was introduced.
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changes/ticket25995
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changes/ticket25995
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o Minor bugfixes (tests):
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- While running the circuit_timeout test, fix the PRNG to a deterministic
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AES stream, so that the test coverage from this test will itself be
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deterministic. Fixes bug 25995; bugfix on 0.2.2.2-alpha.
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@ -349,6 +349,18 @@ test_onion_queues(void *arg)
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tor_free(onionskin);
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}
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static crypto_cipher_t *crypto_rand_aes_cipher = NULL;
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// Mock replacement for crypto_rand: Generates bytes from a provided AES_CTR
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// cipher in <b>crypto_rand_aes_cipher</b>.
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static void
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crypto_rand_deterministic_aes(char *out, size_t n)
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{
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tor_assert(crypto_rand_aes_cipher);
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memset(out, 0, n);
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crypto_cipher_crypt_inplace(crypto_rand_aes_cipher, out, n);
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}
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static void
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test_circuit_timeout(void *arg)
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{
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@ -378,6 +390,11 @@ test_circuit_timeout(void *arg)
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state = or_state_new();
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// Use a deterministic RNG here, or else we'll get nondeterministic
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// coverage in some of the circuitstats functions.
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MOCK(crypto_rand, crypto_rand_deterministic_aes);
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crypto_rand_aes_cipher = crypto_cipher_new("xyzzyplughplover");
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circuitbuild_running_unit_tests();
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#define timeout0 (build_time_t)(30*1000.0)
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initial.Xm = 3000;
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@ -512,6 +529,8 @@ test_circuit_timeout(void *arg)
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circuit_build_times_free_timeouts(&final);
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or_state_free(state);
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teardown_periodic_events();
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UNMOCK(crypto_rand);
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crypto_cipher_free(crypto_rand_aes_cipher);
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}
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/** Test encoding and parsing of rendezvous service descriptors. */
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