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[tor-commits] [tor/master] Add test to explicitly check state lengths and token counts.
commit e8a1f241783878a242ebb153119af06631fe7cdb
Author: Mike Perry <mikeperry-git@xxxxxxxxxxxxxx>
Date: Wed May 15 03:45:03 2019 +0000
Add test to explicitly check state lengths and token counts.
Our other tests tested state lengths against padding packets, and token counts
against non-padding packets. This test checks state lengths against
non-padding packets (and also padding packets too), and checks token counts
against padding packets (and also non-padding packets too).
The next three commits are needed to make this test pass (it found 3 bugs).
Yay?
---
src/test/test_circuitpadding.c | 180 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 180 insertions(+)
diff --git a/src/test/test_circuitpadding.c b/src/test/test_circuitpadding.c
index b19bbcc94..b2ae659a6 100644
--- a/src/test/test_circuitpadding.c
+++ b/src/test/test_circuitpadding.c
@@ -55,6 +55,7 @@ void test_circuitpadding_conditions(void *arg);
void test_circuitpadding_serialize(void *arg);
void test_circuitpadding_rtt(void *arg);
void test_circuitpadding_tokens(void *arg);
+void test_circuitpadding_state_length(void *arg);
static void
simulate_single_hop_extend(circuit_t *client, circuit_t *mid_relay,
@@ -1644,6 +1645,55 @@ simulate_single_hop_extend(circuit_t *client, circuit_t *mid_relay,
}
static circpad_machine_spec_t *
+helper_create_length_machine(void)
+{
+ circpad_machine_spec_t *ret =
+ tor_malloc_zero(sizeof(circpad_machine_spec_t));
+
+ /* Start, burst */
+ circpad_machine_states_init(ret, 2);
+
+ ret->states[CIRCPAD_STATE_START].
+ next_state[CIRCPAD_EVENT_PADDING_SENT] = CIRCPAD_STATE_BURST;
+
+ ret->states[CIRCPAD_STATE_BURST].
+ next_state[CIRCPAD_EVENT_PADDING_SENT] = CIRCPAD_STATE_BURST;
+
+ ret->states[CIRCPAD_STATE_BURST].
+ next_state[CIRCPAD_EVENT_LENGTH_COUNT] = CIRCPAD_STATE_END;
+
+ ret->states[CIRCPAD_STATE_BURST].
+ next_state[CIRCPAD_EVENT_BINS_EMPTY] = CIRCPAD_STATE_END;
+
+ /* No token removal.. end via state_length only */
+ ret->states[CIRCPAD_STATE_BURST].token_removal =
+ CIRCPAD_TOKEN_REMOVAL_NONE;
+
+ /* Let's have this one end after 12 packets */
+ ret->states[CIRCPAD_STATE_BURST].length_dist.type = CIRCPAD_DIST_UNIFORM;
+ ret->states[CIRCPAD_STATE_BURST].length_dist.param1 = 12;
+ ret->states[CIRCPAD_STATE_BURST].length_dist.param2 = 13;
+ ret->states[CIRCPAD_STATE_BURST].max_length = 12;
+
+ ret->states[CIRCPAD_STATE_BURST].histogram_len = 4;
+
+ ret->states[CIRCPAD_STATE_BURST].histogram_edges[0] = 0;
+ ret->states[CIRCPAD_STATE_BURST].histogram_edges[1] = 1;
+ ret->states[CIRCPAD_STATE_BURST].histogram_edges[2] = 1000000;
+ ret->states[CIRCPAD_STATE_BURST].histogram_edges[3] = 10000000;
+
+ ret->states[CIRCPAD_STATE_BURST].histogram[0] = 0;
+ ret->states[CIRCPAD_STATE_BURST].histogram[1] = 0;
+ ret->states[CIRCPAD_STATE_BURST].histogram[2] = 6;
+
+ ret->states[CIRCPAD_STATE_BURST].histogram_total_tokens = 6;
+ ret->states[CIRCPAD_STATE_BURST].use_rtt_estimate = 0;
+ ret->states[CIRCPAD_STATE_BURST].length_includes_nonpadding = 0;
+
+ return ret;
+}
+
+static circpad_machine_spec_t *
helper_create_conditional_machine(void)
{
circpad_machine_spec_t *ret =
@@ -1739,6 +1789,135 @@ helper_create_conditional_machines(void)
}
void
+test_circuitpadding_state_length(void *arg)
+{
+ /**
+ * Test plan:
+ * * Explicitly test that with no token removal enabled, we hit
+ * the state length limit due to either padding, or non-padding.
+ * * Repeat test with an arbitrary token removal strategy, and
+ * verify that if we run out of tokens due to padding before we
+ * hit the state length, we still go to state end (all our
+ * token removal tests only test nonpadding token removal).
+ */
+ int64_t actual_mocked_monotime_start;
+ (void)arg;
+ MOCK(circuitmux_attach_circuit, circuitmux_attach_circuit_mock);
+ MOCK(circpad_send_command_to_hop, circpad_send_command_to_hop_mock);
+
+ nodes_init();
+ dummy_channel.cmux = circuitmux_alloc();
+ relay_side = TO_CIRCUIT(new_fake_orcirc(&dummy_channel,
+ &dummy_channel));
+ client_side = TO_CIRCUIT(origin_circuit_new());
+ relay_side->purpose = CIRCUIT_PURPOSE_OR;
+ client_side->purpose = CIRCUIT_PURPOSE_C_GENERAL;
+
+ monotime_init();
+ monotime_enable_test_mocking();
+ actual_mocked_monotime_start = MONOTIME_MOCK_START;
+ monotime_set_mock_time_nsec(actual_mocked_monotime_start);
+ monotime_coarse_set_mock_time_nsec(actual_mocked_monotime_start);
+ curr_mocked_time = actual_mocked_monotime_start;
+
+ /* This is needed so that we are not considered to be dormant */
+ note_user_activity(20);
+
+ timers_initialize();
+ circpad_machine_spec_t *client_machine =
+ helper_create_length_machine();
+
+ MOCK(circuit_package_relay_cell,
+ circuit_package_relay_cell_mock);
+ MOCK(node_get_by_id,
+ node_get_by_id_mock);
+
+ client_side->padding_machine[0] = client_machine;
+ client_side->padding_info[0] =
+ circpad_circuit_machineinfo_new(client_side, 0);
+ circpad_machine_runtime_t *mi = client_side->padding_info[0];
+
+ circpad_cell_event_padding_sent(client_side);
+ tt_int_op(mi->state_length, OP_EQ, 12);
+ tt_ptr_op(mi->histogram, OP_EQ, NULL);
+
+ /* Verify that non-padding does not change our state length */
+ circpad_cell_event_nonpadding_sent(client_side);
+ tt_int_op(mi->state_length, OP_EQ, 12);
+
+ /* verify that sending padding changes our state length */
+ for (uint64_t i = mi->state_length-1; i > 0; i--) {
+ circpad_send_padding_cell_for_callback(mi);
+ tt_int_op(mi->state_length, OP_EQ, i);
+ }
+ circpad_send_padding_cell_for_callback(mi);
+
+ tt_int_op(mi->state_length, OP_EQ, -1);
+ tt_int_op(mi->current_state, OP_EQ, CIRCPAD_STATE_END);
+
+ /* Restart machine */
+ mi->current_state = CIRCPAD_STATE_START;
+
+ /* Now, count nonpadding as part of the state length */
+ client_machine->states[CIRCPAD_STATE_BURST].length_includes_nonpadding = 1;
+
+ circpad_cell_event_padding_sent(client_side);
+ tt_int_op(mi->state_length, OP_EQ, 12);
+
+ /* Verify that non-padding does change our state length now */
+ for (uint64_t i = mi->state_length-1; i > 0; i--) {
+ circpad_cell_event_nonpadding_sent(client_side);
+ tt_int_op(mi->state_length, OP_EQ, i);
+ }
+
+ circpad_cell_event_nonpadding_sent(client_side);
+ tt_int_op(mi->state_length, OP_EQ, -1);
+ tt_int_op(mi->current_state, OP_EQ, CIRCPAD_STATE_END);
+
+ /* Now, just test token removal when we send padding */
+ client_machine->states[CIRCPAD_STATE_BURST].token_removal =
+ CIRCPAD_TOKEN_REMOVAL_EXACT;
+
+ /* Restart machine */
+ mi->current_state = CIRCPAD_STATE_START;
+ circpad_cell_event_padding_sent(client_side);
+ tt_int_op(mi->state_length, OP_EQ, 12);
+ tt_ptr_op(mi->histogram, OP_NE, NULL);
+ tt_int_op(mi->chosen_bin, OP_EQ, 2);
+
+ /* verify that sending padding changes our state length and
+ * our histogram now */
+ for (uint32_t i = mi->histogram[2]-1; i > 0; i--) {
+ circpad_send_padding_cell_for_callback(mi);
+ tt_int_op(mi->chosen_bin, OP_EQ, 2);
+ tt_int_op(mi->histogram[2], OP_EQ, i);
+ }
+
+ tt_int_op(mi->state_length, OP_EQ, 7);
+ tt_int_op(mi->histogram[2], OP_EQ, 1);
+
+ circpad_send_padding_cell_for_callback(mi);
+ tt_int_op(mi->current_state, OP_EQ, CIRCPAD_STATE_END);
+
+ done:
+ tor_free(client_machine->states);
+ tor_free(client_machine);
+
+ free_fake_origin_circuit(TO_ORIGIN_CIRCUIT(client_side));
+ free_fake_orcirc(relay_side);
+
+ circuitmux_detach_all_circuits(dummy_channel.cmux, NULL);
+ circuitmux_free(dummy_channel.cmux);
+ timers_shutdown();
+ monotime_disable_test_mocking();
+ UNMOCK(circuit_package_relay_cell);
+ UNMOCK(circuitmux_attach_circuit);
+ UNMOCK(node_get_by_id);
+
+ return;
+}
+
+void
test_circuitpadding_conditions(void *arg)
{
/**
@@ -2556,6 +2735,7 @@ test_circuitpadding_reduce_disable(void *arg)
struct testcase_t circuitpadding_tests[] = {
TEST_CIRCUITPADDING(circuitpadding_tokens, TT_FORK),
+ TEST_CIRCUITPADDING(circuitpadding_state_length, TT_FORK),
TEST_CIRCUITPADDING(circuitpadding_negotiation, TT_FORK),
TEST_CIRCUITPADDING(circuitpadding_wronghop, TT_FORK),
/** Disabled unstable test until #29298 is implemented (see #29122) */
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