src/test/test_channelpadding.c

   1 /* Copyright (c) 2016-2018, The Tor Project, Inc. */
   2 /* See LICENSE for licensing information */
   3
   4 #define TOR_CHANNEL_INTERNAL_
   5 #define MAINLOOP_PRIVATE
   6 #define NETWORKSTATUS_PRIVATE
   7 #define TOR_TIMERS_PRIVATE
   8 #include "core/or/or.h"
   9 #include "test/test.h"
  10 #include "lib/testsupport/testsupport.h"
  11 #include "core/mainloop/connection.h"
  12 #include "core/or/connection_or.h"
  13 #include "core/or/channel.h"
  14 #include "core/or/channeltls.h"
  15 #include "core/or/channelpadding.h"
  16 #include "lib/evloop/compat_libevent.h"
  17 #include "app/config/config.h"
  18 #include "lib/time/compat_time.h"
  19 #include "core/mainloop/mainloop.h"
  20 #include "feature/nodelist/networkstatus.h"
  21 #include "test/log_test_helpers.h"
  22 #include "lib/tls/tortls.h"
  23 #include "lib/evloop/timers.h"
  24 #include "lib/container/buffers.h"
  25
  26 #include "core/or/cell_st.h"
  27 #include "feature/nodelist/networkstatus_st.h"
  28 #include "core/or/or_connection_st.h"
  29 #include "feature/nodelist/routerstatus_st.h"
  30
  31 int channelpadding_get_netflow_inactive_timeout_ms(channel_t *chan);
  32 int64_t channelpadding_compute_time_until_pad_for_netflow(channel_t *chan);
  33 int channelpadding_send_disable_command(channel_t*);
  34 int channelpadding_find_timerslot(channel_t *chan);
  35
  36 void test_channelpadding_timers(void *arg);
  37 void test_channelpadding_consensus(void *arg);
  38 void test_channelpadding_negotiation(void *arg);
  39 void test_channelpadding_decide_to_pad_channel(void *arg);
  40 void test_channelpadding_killonehop(void *arg);
  41
  42 void dummy_nop_timer(void);
  43
  44 #define NSEC_PER_MSEC (1000*1000)
  45
  46 /* Thing to cast to fake tor_tls_t * to appease assert_connection_ok() */
  47 static int fake_tortls = 0; /* Bleh... */
  48
  49 static int dont_stop_libevent = 0;
  50
  51 // From test_channel.c
  52 channel_t * new_fake_channel(void);
  53 void free_fake_channel(channel_t*);
  54
  55 static int
  56 mock_channel_has_queued_writes(channel_t *chan)
  57 {
  58   (void)chan;
  59   return 0;
  60 }
  61
  62 static int tried_to_write_cell = 0;
  63
  64 static channel_t *relay1_relay2;
  65 static channel_t *relay2_relay1;
  66 static channel_t *relay3_client;
  67 static channel_t *client_relay3;
  68
  69 static int
  70 mock_channel_write_cell_relay2(channel_t *chan, cell_t *cell)
  71 {
  72   (void)chan;
  73   tried_to_write_cell++;
  74   channel_tls_handle_cell(cell, ((channel_tls_t*)relay1_relay2)->conn);
  75   tor_libevent_exit_loop_after_callback(tor_libevent_get_base());
  76   return 0;
  77 }
  78
  79 static int
  80 mock_channel_write_cell_relay1(channel_t *chan, cell_t *cell)
  81 {
  82   (void)chan;
  83   tried_to_write_cell++;
  84   channel_tls_handle_cell(cell, ((channel_tls_t*)relay2_relay1)->conn);
  85   tor_libevent_exit_loop_after_callback(tor_libevent_get_base());
  86   return 0;
  87 }
  88
  89 static int
  90 mock_channel_write_cell_relay3(channel_t *chan, cell_t *cell)
  91 {
  92   (void)chan;
  93   tried_to_write_cell++;
  94   channel_tls_handle_cell(cell, ((channel_tls_t*)client_relay3)->conn);
  95   tor_libevent_exit_loop_after_callback(tor_libevent_get_base());
  96   return 0;
  97 }
  98
  99 static int
 100 mock_channel_write_cell_client(channel_t *chan, cell_t *cell)
 101 {
 102   (void)chan;
 103   tried_to_write_cell++;
 104   channel_tls_handle_cell(cell, ((channel_tls_t*)relay3_client)->conn);
 105   tor_libevent_exit_loop_after_callback(tor_libevent_get_base());
 106   return 0;
 107 }
 108
 109 static int
 110 mock_channel_write_cell(channel_t *chan, cell_t *cell)
 111 {
 112   tried_to_write_cell++;
 113   channel_tls_handle_cell(cell, ((channel_tls_t*)chan)->conn);
 114   if (!dont_stop_libevent)
 115     tor_libevent_exit_loop_after_callback(tor_libevent_get_base());
 116   return 0;
 117 }
 118
 119 static void
 120 setup_fake_connection_for_channel(channel_tls_t *chan)
 121 {
 122   or_connection_t *conn = (or_connection_t*)connection_new(CONN_TYPE_OR,
 123                                                            AF_INET);
 124
 125   conn->base_.conn_array_index = smartlist_len(connection_array);
 126   smartlist_add(connection_array, conn);
 127
 128   conn->chan = chan;
 129   chan->conn = conn;
 130
 131   conn->base_.magic = OR_CONNECTION_MAGIC;
 132   conn->base_.state = OR_CONN_STATE_OPEN;
 133   conn->base_.type = CONN_TYPE_OR;
 134   conn->base_.socket_family = AF_INET;
 135   conn->base_.address = tor_strdup("<fake>");
 136
 137   conn->base_.port = 4242;
 138
 139   conn->tls = (tor_tls_t *)((void *)(&fake_tortls));
 140
 141   conn->link_proto = MIN_LINK_PROTO_FOR_CHANNEL_PADDING;
 142
 143   connection_or_set_canonical(conn, 1);
 144 }
 145
 146 static channel_tls_t *
 147 new_fake_channeltls(uint8_t id)
 148 {
 149   channel_tls_t *chan = tor_realloc(new_fake_channel(), sizeof(channel_tls_t));
 150   chan->base_.magic = TLS_CHAN_MAGIC;
 151   setup_fake_connection_for_channel(chan);
 152   chan->base_.channel_usage = CHANNEL_USED_FOR_FULL_CIRCS;
 153   chan->base_.has_queued_writes = mock_channel_has_queued_writes;
 154   chan->base_.write_cell = mock_channel_write_cell;
 155   chan->base_.padding_enabled = 1;
 156
 157   chan->base_.identity_digest[0] = id;
 158   channel_register(&chan->base_);
 159
 160   return chan;
 161 }
 162
 163 static void
 164 free_fake_channeltls(channel_tls_t *chan)
 165 {
 166   channel_unregister(&chan->base_);
 167
 168   tor_free(((channel_tls_t*)chan)->conn->base_.address);
 169   buf_free(((channel_tls_t*)chan)->conn->base_.inbuf);
 170   buf_free(((channel_tls_t*)chan)->conn->base_.outbuf);
 171   tor_free(((channel_tls_t*)chan)->conn);
 172
 173   timer_free(chan->base_.padding_timer);
 174   channel_handle_free(chan->base_.timer_handle);
 175   channel_handles_clear(&chan->base_);
 176
 177   free_fake_channel(&chan->base_);
 178
 179   return;
 180 }
 181
 182 static void
 183 setup_mock_consensus(void)
 184 {
 185   current_md_consensus = current_ns_consensus
 186         = tor_malloc_zero(sizeof(networkstatus_t));
 187   current_md_consensus->net_params = smartlist_new();
 188   current_md_consensus->routerstatus_list = smartlist_new();
 189   channelpadding_new_consensus_params(current_md_consensus);
 190 }
 191
 192 static void
 193 free_mock_consensus(void)
 194 {
 195   SMARTLIST_FOREACH(current_md_consensus->routerstatus_list, void *, r,
 196                     tor_free(r));
 197   smartlist_free(current_md_consensus->routerstatus_list);
 198   smartlist_free(current_ns_consensus->net_params);
 199   tor_free(current_ns_consensus);
 200 }
 201
 202 static void
 203 setup_mock_network(void)
 204 {
 205   routerstatus_t *relay;
 206   if (!connection_array)
 207     connection_array = smartlist_new();
 208
 209   relay1_relay2 = (channel_t*)new_fake_channeltls(2);
 210   relay1_relay2->write_cell = mock_channel_write_cell_relay1;
 211   channel_timestamp_active(relay1_relay2);
 212   relay = tor_malloc_zero(sizeof(routerstatus_t));
 213   relay->identity_digest[0] = 1;
 214   smartlist_add(current_md_consensus->routerstatus_list, relay);
 215
 216   relay2_relay1 = (channel_t*)new_fake_channeltls(1);
 217   relay2_relay1->write_cell = mock_channel_write_cell_relay2;
 218   channel_timestamp_active(relay2_relay1);
 219   relay = tor_malloc_zero(sizeof(routerstatus_t));
 220   relay->identity_digest[0] = 2;
 221   smartlist_add(current_md_consensus->routerstatus_list, relay);
 222
 223   relay3_client = (channel_t*)new_fake_channeltls(0);
 224   relay3_client->write_cell = mock_channel_write_cell_relay3;
 225   relay3_client->is_client = 1;
 226   channel_timestamp_active(relay3_client);
 227   relay = tor_malloc_zero(sizeof(routerstatus_t));
 228   relay->identity_digest[0] = 3;
 229   smartlist_add(current_md_consensus->routerstatus_list, relay);
 230
 231   client_relay3 = (channel_t*)new_fake_channeltls(3);
 232   client_relay3->write_cell = mock_channel_write_cell_client;
 233   channel_timestamp_active(client_relay3);
 234
 235   channel_do_open_actions(relay1_relay2);
 236   channel_do_open_actions(relay2_relay1);
 237   channel_do_open_actions(relay3_client);
 238   channel_do_open_actions(client_relay3);
 239 }
 240
 241 static void
 242 free_mock_network(void)
 243 {
 244   free_fake_channeltls((channel_tls_t*)relay1_relay2);
 245   free_fake_channeltls((channel_tls_t*)relay2_relay1);
 246   free_fake_channeltls((channel_tls_t*)relay3_client);
 247   free_fake_channeltls((channel_tls_t*)client_relay3);
 248
 249   smartlist_free(connection_array);
 250 }
 251
 252 static void
 253 dummy_timer_cb(tor_timer_t *t, void *arg, const monotime_t *now_mono)
 254 {
 255   (void)t; (void)arg; (void)now_mono;
 256   tor_libevent_exit_loop_after_callback(tor_libevent_get_base());
 257   return;
 258 }
 259
 260 // This hack adds a dummy timer so that the libevent base loop
 261 // actually returns when we don't expect any timers to fire. Otherwise,
 262 // the global_timer_event gets scheduled an hour from now, and the
 263 // base loop never returns.
 264 void
 265 dummy_nop_timer(void)
 266 {
 267   tor_timer_t *dummy_timer = timer_new(dummy_timer_cb, NULL);
 268   struct timeval timeout;
 269   timeout.tv_sec = 1;
 270   timeout.tv_usec = 0;
 271
 272   timer_schedule(dummy_timer, &timeout);
 273
 274   tor_libevent_run_event_loop(tor_libevent_get_base(), 0);
 275
 276   timer_free(dummy_timer);
 277 }
 278
 279 #define CHANNELPADDING_MAX_TIMERS 25
 280 #define CHANNELS_TO_TEST (CHANNELPADDING_MAX_TIMERS*4)
 281 /**
 282  * Tests to ensure that we handle more than the max number of pending
 283  * timers properly.
 284  */
 285 void
 286 test_channelpadding_timers(void *arg)
 287 {
 288   channelpadding_decision_t decision;
 289   channel_t *chans[CHANNELS_TO_TEST];
 290   (void)arg;
 291
 292   tor_libevent_postfork();
 293
 294   if (!connection_array)
 295     connection_array = smartlist_new();
 296
 297   monotime_init();
 298   monotime_enable_test_mocking();
 299   uint64_t nsec_mock = 1;
 300   monotime_set_mock_time_nsec(nsec_mock);
 301   monotime_coarse_set_mock_time_nsec(nsec_mock);
 302
 303   timers_initialize();
 304   channelpadding_new_consensus_params(NULL);
 305
 306   for (int i = 0; i < CHANNELS_TO_TEST; i++) {
 307     chans[i] = (channel_t*)new_fake_channeltls(0);
 308     channel_timestamp_active(chans[i]);
 309   }
 310
 311   for (int j = 0; j < 2; j++) {
 312     tried_to_write_cell = 0;
 313     int i = 0;
 314
 315     monotime_coarse_t now;
 316     monotime_coarse_get(&now);
 317
 318     /* This loop fills our timerslot array with timers of increasing time
 319      * until they fire */
 320     for (; i < CHANNELPADDING_MAX_TIMERS; i++) {
 321       monotime_coarse_add_msec(&chans[i]->next_padding_time,
 322                         &now, 10 + i*4);
 323       decision = channelpadding_decide_to_pad_channel(chans[i]);
 324       tt_int_op(decision, OP_EQ, CHANNELPADDING_PADDING_SCHEDULED);
 325       tt_assert(chans[i]->pending_padding_callback);
 326       tt_int_op(tried_to_write_cell, OP_EQ, 0);
 327     }
 328
 329     /* This loop should add timers to the first position in the timerslot
 330      * array, since its timeout is before all other timers. */
 331     for (; i < CHANNELS_TO_TEST/3; i++) {
 332       monotime_coarse_add_msec(&chans[i]->next_padding_time,
 333                         &now, 1);
 334       decision = channelpadding_decide_to_pad_channel(chans[i]);
 335       tt_int_op(decision, OP_EQ, CHANNELPADDING_PADDING_SCHEDULED);
 336       tt_assert(chans[i]->pending_padding_callback);
 337       tt_int_op(tried_to_write_cell, OP_EQ, 0);
 338     }
 339
 340     /* This loop should add timers to our existing lists in a weak
 341      * pseudorandom pattern.  It ensures that the lists can grow with multiple
 342      * timers in them. */
 343     for (; i < CHANNELS_TO_TEST/2; i++) {
 344       monotime_coarse_add_msec(&chans[i]->next_padding_time,
 345                         &now, 10 + i*3 % CHANNELPADDING_MAX_TIMERS);
 346       decision = channelpadding_decide_to_pad_channel(chans[i]);
 347       tt_int_op(decision, OP_EQ, CHANNELPADDING_PADDING_SCHEDULED);
 348       tt_assert(chans[i]->pending_padding_callback);
 349       tt_int_op(tried_to_write_cell, OP_EQ, 0);
 350     }
 351
 352     /* This loop should add timers to the last position in the timerslot
 353      * array, since its timeout is after all other timers. */
 354     for (; i < CHANNELS_TO_TEST; i++) {
 355       monotime_coarse_add_msec(&chans[i]->next_padding_time,
 356                                &now, 500 + i % CHANNELPADDING_MAX_TIMERS);
 357       decision = channelpadding_decide_to_pad_channel(chans[i]);
 358       tt_int_op(decision, OP_EQ, CHANNELPADDING_PADDING_SCHEDULED);
 359       tt_assert(chans[i]->pending_padding_callback);
 360       tt_int_op(tried_to_write_cell, OP_EQ, 0);
 361     }
 362
 363     // Wait for the timers and then kill the event loop.
 364     nsec_mock += 1001 * NSEC_PER_MSEC;
 365     monotime_coarse_set_mock_time_nsec(nsec_mock);
 366     monotime_set_mock_time_nsec(nsec_mock);
 367     timers_run_pending();
 368
 369     tt_int_op(tried_to_write_cell, OP_EQ, CHANNELS_TO_TEST);
 370
 371     // Test that we have no pending callbacks and all empty slots now
 372     for (i = 0; i < CHANNELS_TO_TEST; i++) {
 373       tt_assert(!chans[i]->pending_padding_callback);
 374     }
 375   }
 376
 377  done:
 378   for (int i = 0; i < CHANNELS_TO_TEST; i++) {
 379     free_fake_channeltls((channel_tls_t*)chans[i]);
 380   }
 381   smartlist_free(connection_array);
 382
 383   timers_shutdown();
 384   monotime_disable_test_mocking();
 385   channel_free_all();
 386
 387   return;
 388 }
 389
 390 void
 391 test_channelpadding_killonehop(void *arg)
 392 {
 393   channelpadding_decision_t decision;
 394   int64_t new_time;
 395   (void)arg;
 396   tor_libevent_postfork();
 397
 398   routerstatus_t *relay = tor_malloc_zero(sizeof(routerstatus_t));
 399   monotime_init();
 400   monotime_enable_test_mocking();
 401   monotime_set_mock_time_nsec(1);
 402   monotime_coarse_set_mock_time_nsec(1);
 403   new_time = 1;
 404
 405   timers_initialize();
 406   setup_mock_consensus();
 407   setup_mock_network();
 408
 409   /* Do we disable padding if rsos is enabled, and the consensus says don't
 410    * pad?  */
 411
 412   monotime_coarse_t now;
 413   monotime_coarse_get(&now);
 414
 415   // First, test that padding works if either is enabled
 416   smartlist_clear(current_md_consensus->net_params);
 417   channelpadding_new_consensus_params(current_md_consensus);
 418
 419   relay3_client->padding_enabled = 1;
 420   client_relay3->padding_enabled = 1;
 421
 422   tried_to_write_cell = 0;
 423   get_options_mutable()->ORPort_set = 0;
 424   get_options_mutable()->HiddenServiceSingleHopMode = 1;
 425   get_options_mutable()->HiddenServiceNonAnonymousMode = 1;
 426
 427   monotime_coarse_add_msec(&client_relay3->next_padding_time, &now, 100);
 428   decision = channelpadding_decide_to_pad_channel(client_relay3);
 429   tt_int_op(decision, OP_EQ, CHANNELPADDING_PADDING_SCHEDULED);
 430   tt_assert(client_relay3->pending_padding_callback);
 431   tt_int_op(tried_to_write_cell, OP_EQ, 0);
 432
 433   decision = channelpadding_decide_to_pad_channel(client_relay3);
 434   tt_int_op(decision, OP_EQ, CHANNELPADDING_PADDING_ALREADY_SCHEDULED);
 435
 436   // Wait for the timer
 437   new_time += 101 * NSEC_PER_MSEC;
 438   monotime_coarse_set_mock_time_nsec(new_time);
 439   monotime_set_mock_time_nsec(new_time);
 440   monotime_coarse_get(&now);
 441   timers_run_pending();
 442   tt_int_op(tried_to_write_cell, OP_EQ, 1);
 443   tt_assert(!client_relay3->pending_padding_callback);
 444
 445   // Then test disabling each via consensus param
 446   smartlist_add(current_md_consensus->net_params,
 447                 (void*)"nf_pad_single_onion=0");
 448   channelpadding_new_consensus_params(current_md_consensus);
 449
 450   // Before the client tries to pad, the relay will still pad:
 451   tried_to_write_cell = 0;
 452   monotime_coarse_add_msec(&relay3_client->next_padding_time, &now, 100);
 453   get_options_mutable()->ORPort_set = 1;
 454   get_options_mutable()->HiddenServiceSingleHopMode = 0;
 455   get_options_mutable()->HiddenServiceNonAnonymousMode = 0;
 456   decision = channelpadding_decide_to_pad_channel(relay3_client);
 457   tt_int_op(decision, OP_EQ, CHANNELPADDING_PADDING_SCHEDULED);
 458   tt_assert(relay3_client->pending_padding_callback);
 459
 460   // Wait for the timer
 461   new_time += 101 * NSEC_PER_MSEC;
 462   monotime_coarse_set_mock_time_nsec(new_time);
 463   monotime_set_mock_time_nsec(new_time);
 464   monotime_coarse_get(&now);
 465   timers_run_pending();
 466   tt_int_op(tried_to_write_cell, OP_EQ, 1);
 467   tt_assert(!client_relay3->pending_padding_callback);
 468
 469   // Test client side (it should stop immediately)
 470   get_options_mutable()->HiddenServiceSingleHopMode = 1;
 471   get_options_mutable()->HiddenServiceNonAnonymousMode = 1;
 472   /* For the relay to receive the negotiate: */
 473   get_options_mutable()->ORPort_set = 1;
 474   decision = channelpadding_decide_to_pad_channel(client_relay3);
 475   tt_int_op(decision, OP_EQ, CHANNELPADDING_WONTPAD);
 476   tt_assert(!client_relay3->pending_padding_callback);
 477
 478   // Test relay side (it should have gotten the negotiation to disable)
 479   get_options_mutable()->ORPort_set = 1;
 480   get_options_mutable()->HiddenServiceSingleHopMode = 0;
 481   get_options_mutable()->HiddenServiceNonAnonymousMode = 0;
 482   tt_int_op(channelpadding_decide_to_pad_channel(relay3_client), OP_EQ,
 483       CHANNELPADDING_WONTPAD);
 484   tt_assert(!relay3_client->padding_enabled);
 485
 486  done:
 487   free_mock_consensus();
 488   free_mock_network();
 489   tor_free(relay);
 490
 491   timers_shutdown();
 492   monotime_disable_test_mocking();
 493   channel_free_all();
 494 }
 495
 496 void
 497 test_channelpadding_consensus(void *arg)
 498 {
 499   channelpadding_decision_t decision;
 500   or_options_t *options = get_options_mutable();
 501   int64_t val;
 502   int64_t new_time;
 503   (void)arg;
 504
 505   tor_libevent_postfork();
 506
 507   /*
 508    * Params tested:
 509    *   nf_pad_before_usage
 510    *   nf_pad_relays
 511    *   nf_ito_low
 512    *   nf_ito_high
 513    *
 514    * Plan:
 515    * 1. Padding can be completely disabled via consensus
 516    * 2. Negotiation can't re-enable consensus-disabled padding
 517    * 3. Negotiation can't increase padding from relays beyond
 518    *    consensus defaults
 519    * 4. Relay-to-relay padding can be enabled/disabled in consensus
 520    * 5. Can enable/disable padding before actually using a connection
 521    * 6. Can we control circ and TLS conn lifetime from the consensus?
 522    */
 523   channel_t *chan;
 524   routerstatus_t *relay = tor_malloc_zero(sizeof(routerstatus_t));
 525   monotime_enable_test_mocking();
 526   monotime_set_mock_time_nsec(1);
 527   monotime_coarse_set_mock_time_nsec(1);
 528   new_time = 1;
 529   monotime_coarse_t now;
 530   monotime_coarse_get(&now);
 531   timers_initialize();
 532
 533   if (!connection_array)
 534     connection_array = smartlist_new();
 535   chan = (channel_t*)new_fake_channeltls(0);
 536   channel_timestamp_active(chan);
 537
 538   setup_mock_consensus();
 539
 540   get_options_mutable()->ORPort_set = 1;
 541
 542   /* Test 1: Padding can be completely disabled via consensus */
 543   tried_to_write_cell = 0;
 544   monotime_coarse_add_msec(&chan->next_padding_time, &now, 100);
 545   decision = channelpadding_decide_to_pad_channel(chan);
 546   tt_int_op(decision, OP_EQ, CHANNELPADDING_PADDING_SCHEDULED);
 547   tt_assert(chan->pending_padding_callback);
 548   tt_int_op(tried_to_write_cell, OP_EQ, 0);
 549
 550   decision = channelpadding_decide_to_pad_channel(chan);
 551   tt_int_op(decision, OP_EQ, CHANNELPADDING_PADDING_ALREADY_SCHEDULED);
 552
 553   // Wait for the timer
 554   new_time += 101*NSEC_PER_MSEC;
 555   monotime_coarse_set_mock_time_nsec(new_time);
 556   monotime_set_mock_time_nsec(new_time);
 557   monotime_coarse_get(&now);
 558   timers_run_pending();
 559   tt_int_op(tried_to_write_cell, OP_EQ, 1);
 560   tt_assert(!chan->pending_padding_callback);
 561
 562   smartlist_add(current_md_consensus->net_params,
 563                 (void*)"nf_ito_low=0");
 564   smartlist_add(current_md_consensus->net_params,
 565                 (void*)"nf_ito_high=0");
 566   get_options_mutable()->ConnectionPadding = 1;
 567   channelpadding_new_consensus_params(current_md_consensus);
 568
 569   decision = channelpadding_decide_to_pad_channel(chan);
 570   tt_int_op(decision, OP_EQ, CHANNELPADDING_WONTPAD);
 571   tt_assert(!chan->pending_padding_callback);
 572   val = channelpadding_get_netflow_inactive_timeout_ms(chan);
 573   tt_i64_op(val, OP_EQ, 0);
 574   val = channelpadding_compute_time_until_pad_for_netflow(chan);
 575   tt_i64_op(val, OP_EQ, -2);
 576
 577   /* Test 2: Negotiation can't re-enable consensus-disabled padding */
 578   channelpadding_send_enable_command(chan, 100, 200);
 579   tried_to_write_cell = 0;
 580   decision = channelpadding_decide_to_pad_channel(chan);
 581   tt_int_op(decision, OP_EQ, CHANNELPADDING_WONTPAD);
 582   tt_assert(!chan->pending_padding_callback);
 583   val = channelpadding_get_netflow_inactive_timeout_ms(chan);
 584   tt_i64_op(val, OP_EQ, 0);
 585   val = channelpadding_compute_time_until_pad_for_netflow(chan);
 586   tt_i64_op(val, OP_EQ, -2);
 587   tt_assert(monotime_coarse_is_zero(&chan->next_padding_time));
 588
 589   smartlist_clear(current_md_consensus->net_params);
 590
 591   /* Test 3: Negotiation can't increase padding from relays beyond consensus
 592    * values */
 593   smartlist_add(current_md_consensus->net_params,
 594                 (void*)"nf_ito_low=100");
 595   smartlist_add(current_md_consensus->net_params,
 596                 (void*)"nf_ito_high=200");
 597   channelpadding_new_consensus_params(current_md_consensus);
 598
 599   tried_to_write_cell = 0;
 600   monotime_coarse_add_msec(&chan->next_padding_time, &now, 100);
 601   decision = channelpadding_decide_to_pad_channel(chan);
 602   tt_int_op(decision, OP_EQ, CHANNELPADDING_PADDING_SCHEDULED);
 603   tt_assert(chan->pending_padding_callback);
 604   tt_int_op(tried_to_write_cell, OP_EQ, 0);
 605   val = channelpadding_get_netflow_inactive_timeout_ms(chan);
 606   tt_i64_op(val, OP_GE, 100);
 607   tt_i64_op(val, OP_LE, 200);
 608   val = channelpadding_compute_time_until_pad_for_netflow(chan);
 609   tt_i64_op(val, OP_LE, 200);
 610
 611   // Wait for the timer
 612   new_time += 201*NSEC_PER_MSEC;
 613   monotime_set_mock_time_nsec(new_time);
 614   monotime_coarse_set_mock_time_nsec(new_time);
 615   monotime_coarse_get(&now);
 616   timers_run_pending();
 617   tt_int_op(tried_to_write_cell, OP_EQ, 1);
 618   tt_assert(!chan->pending_padding_callback);
 619
 620   smartlist_clear(current_md_consensus->net_params);
 621   smartlist_add(current_md_consensus->net_params,
 622                 (void*)"nf_ito_low=1500");
 623   smartlist_add(current_md_consensus->net_params,
 624                 (void*)"nf_ito_high=4500");
 625   channelpadding_new_consensus_params(current_md_consensus);
 626
 627   channelpadding_send_enable_command(chan, 100, 200);
 628   tried_to_write_cell = 0;
 629   decision = channelpadding_decide_to_pad_channel(chan);
 630   tt_int_op(decision, OP_EQ, CHANNELPADDING_PADLATER);
 631   tt_assert(!chan->pending_padding_callback);
 632   val = channelpadding_get_netflow_inactive_timeout_ms(chan);
 633   tt_i64_op(val, OP_GE, 1500);
 634   tt_i64_op(val, OP_LE, 4500);
 635   val = channelpadding_compute_time_until_pad_for_netflow(chan);
 636   tt_i64_op(val, OP_LE, 4500);
 637
 638   /* Test 4: Relay-to-relay padding can be enabled/disabled in consensus */
 639   /* Make this channel a relay's channel */
 640   memcpy(relay->identity_digest,
 641           ((channel_tls_t *)chan)->conn->identity_digest, DIGEST_LEN);
 642   smartlist_add(current_md_consensus->routerstatus_list, relay);
 643   relay = NULL; /* Prevent double-free */
 644
 645   tried_to_write_cell = 0;
 646   decision = channelpadding_decide_to_pad_channel(chan);
 647   tt_int_op(decision, OP_EQ, CHANNELPADDING_WONTPAD);
 648   tt_assert(!chan->pending_padding_callback);
 649
 650   smartlist_add(current_md_consensus->net_params,
 651                 (void*)"nf_pad_relays=1");
 652   channelpadding_new_consensus_params(current_md_consensus);
 653
 654   decision = channelpadding_decide_to_pad_channel(chan);
 655   tt_int_op(decision, OP_EQ, CHANNELPADDING_PADLATER);
 656   tt_assert(!chan->pending_padding_callback);
 657   val = channelpadding_get_netflow_inactive_timeout_ms(chan);
 658   tt_i64_op(val, OP_GE, 1500);
 659   tt_i64_op(val, OP_LE, 4500);
 660   val = channelpadding_compute_time_until_pad_for_netflow(chan);
 661   tt_i64_op(val, OP_LE, 4500);
 662
 663   /* Test 5: If we disable padding before channel usage, does that work? */
 664   smartlist_add(current_md_consensus->net_params,
 665                 (void*)"nf_pad_before_usage=0");
 666   channelpadding_new_consensus_params(current_md_consensus);
 667   tried_to_write_cell = 0;
 668   decision = channelpadding_decide_to_pad_channel(chan);
 669   tt_int_op(decision, OP_EQ, CHANNELPADDING_WONTPAD);
 670   tt_assert(!chan->pending_padding_callback);
 671
 672   /* Test 6: Can we control circ and TLS conn lifetime from the consensus? */
 673   val = channelpadding_get_channel_idle_timeout(NULL, 0);
 674   tt_i64_op(val, OP_GE, 180);
 675   tt_i64_op(val, OP_LE, 180+90);
 676   val = channelpadding_get_channel_idle_timeout(chan, 0);
 677   tt_i64_op(val, OP_GE, 180);
 678   tt_i64_op(val, OP_LE, 180+90);
 679   options->ReducedConnectionPadding = 1;
 680   val = channelpadding_get_channel_idle_timeout(chan, 0);
 681   tt_i64_op(val, OP_GE, 180/2);
 682   tt_i64_op(val, OP_LE, (180+90)/2);
 683
 684   options->ReducedConnectionPadding = 0;
 685   options->ORPort_set = 1;
 686   smartlist_add(current_md_consensus->net_params,
 687                 (void*)"nf_conntimeout_relays=600");
 688   channelpadding_new_consensus_params(current_md_consensus);
 689   val = channelpadding_get_channel_idle_timeout(chan, 1);
 690   tt_i64_op(val, OP_GE, 450);
 691   tt_i64_op(val, OP_LE, 750);
 692
 693   val = channelpadding_get_circuits_available_timeout();
 694   tt_i64_op(val, OP_GE, 30*60);
 695   tt_i64_op(val, OP_LE, 30*60*2);
 696
 697   options->ReducedConnectionPadding = 1;
 698   smartlist_add(current_md_consensus->net_params,
 699                 (void*)"nf_conntimeout_clients=600");
 700   channelpadding_new_consensus_params(current_md_consensus);
 701   val = channelpadding_get_circuits_available_timeout();
 702   tt_i64_op(val, OP_GE, 600/2);
 703   tt_i64_op(val, OP_LE, 600*2/2);
 704
 705   options->ReducedConnectionPadding = 0;
 706   options->CircuitsAvailableTimeout = 24*60*60;
 707   val = channelpadding_get_circuits_available_timeout();
 708   tt_i64_op(val, OP_GE, 24*60*60);
 709   tt_i64_op(val, OP_LE, 24*60*60*2);
 710
 711  done:
 712   tor_free(relay);
 713
 714   free_mock_consensus();
 715   free_fake_channeltls((channel_tls_t*)chan);
 716   smartlist_free(connection_array);
 717
 718   timers_shutdown();
 719   monotime_disable_test_mocking();
 720   channel_free_all();
 721
 722   return;
 723 }
 724
 725 void
 726 test_channelpadding_negotiation(void *arg)
 727 {
 728   channelpadding_negotiate_t disable;
 729   cell_t cell;
 730   channelpadding_decision_t decision;
 731   int val;
 732   (void)arg;
 733
 734   /* Plan:
 735    * 1. Clients reject negotiation, relays accept it.
 736    *    * Bridges accept negotiation from their clients,
 737    *      but not from relays.
 738    * 2. Torrc options can override client-side negotiation
 739    * 3. Test a version issue in channelpadidng cell
 740    * 4. Test channelpadding_reduced_padding
 741    */
 742   monotime_init();
 743   monotime_enable_test_mocking();
 744   monotime_set_mock_time_nsec(1);
 745   monotime_coarse_set_mock_time_nsec(1);
 746   timers_initialize();
 747   setup_mock_consensus();
 748   setup_mock_network();
 749
 750   /* Test case #1: Do the right things ignore negotiation? */
 751   /* relay-to-client case: */
 752   channelpadding_send_disable_command(relay3_client);
 753   tt_assert(client_relay3->padding_enabled);
 754
 755   /* client-to-relay case: */
 756   get_options_mutable()->ORPort_set = 1;
 757   channelpadding_disable_padding_on_channel(client_relay3);
 758   tt_int_op(channelpadding_decide_to_pad_channel(relay3_client), OP_EQ,
 759       CHANNELPADDING_WONTPAD);
 760   tt_assert(!relay3_client->padding_enabled);
 761   relay3_client->padding_enabled = 1;
 762   client_relay3->padding_enabled = 1;
 763
 764   /* Bridge case from relay */
 765   get_options_mutable()->BridgeRelay = 1;
 766   channelpadding_disable_padding_on_channel(relay2_relay1);
 767   tt_assert(relay1_relay2->padding_enabled);
 768
 769   /* Bridge case from client */
 770   channelpadding_disable_padding_on_channel(client_relay3);
 771   tt_assert(!relay3_client->padding_enabled);
 772   tt_int_op(channelpadding_decide_to_pad_channel(relay3_client), OP_EQ,
 773       CHANNELPADDING_WONTPAD);
 774   relay3_client->padding_enabled = 1;
 775   client_relay3->padding_enabled = 1;
 776   get_options_mutable()->BridgeRelay = 0;
 777   get_options_mutable()->ORPort_set = 0;
 778
 779   /* Test case #2: Torrc options */
 780   /* ConnectionPadding auto; Relay doesn't support us */
 781   ((channel_tls_t*)relay3_client)->conn->link_proto = 4;
 782   relay3_client->padding_enabled = 0;
 783   tried_to_write_cell = 0;
 784   decision = channelpadding_decide_to_pad_channel(relay3_client);
 785   tt_int_op(decision, OP_EQ, CHANNELPADDING_WONTPAD);
 786   tt_assert(!relay3_client->pending_padding_callback);
 787   tt_int_op(tried_to_write_cell, OP_EQ, 0);
 788   ((channel_tls_t*)relay3_client)->conn->link_proto = 5;
 789   relay3_client->padding_enabled = 1;
 790
 791   /* ConnectionPadding 1; Relay doesn't support us */
 792   get_options_mutable()->ConnectionPadding = 1;
 793   tried_to_write_cell = 0;
 794   decision = channelpadding_decide_to_pad_channel(client_relay3);
 795   tt_int_op(decision, OP_EQ, CHANNELPADDING_PADLATER);
 796   tt_assert(!client_relay3->pending_padding_callback);
 797   tt_int_op(tried_to_write_cell, OP_EQ, 0);
 798   get_options_mutable()->ConnectionPadding = 0;
 799
 800   /* Test case #3: Test a version issue in channelpadding cell */
 801   get_options_mutable()->ORPort_set = 1;
 802   client_relay3->padding_enabled = 1;
 803   relay3_client->padding_enabled = 1;
 804   memset(&cell, 0, sizeof(cell_t));
 805   memset(&disable, 0, sizeof(channelpadding_negotiate_t));
 806   cell.command = CELL_PADDING_NEGOTIATE;
 807
 808   channelpadding_negotiate_set_command(&disable, CHANNELPADDING_COMMAND_STOP);
 809   disable.version = 1;
 810   channelpadding_negotiate_encode(cell.payload, CELL_PAYLOAD_SIZE, &disable);
 811   client_relay3->write_cell(client_relay3, &cell);
 812   tt_assert(relay3_client->padding_enabled);
 813   tt_int_op(channelpadding_update_padding_for_channel(client_relay3, &disable),
 814           OP_EQ, -1);
 815   tt_assert(client_relay3->padding_enabled);
 816
 817   disable.version = 0;
 818   channelpadding_negotiate_encode(cell.payload, CELL_PAYLOAD_SIZE, &disable);
 819   client_relay3->write_cell(client_relay3, &cell);
 820   tt_assert(!relay3_client->padding_enabled);
 821
 822   /* Test case 4: Reducing padding actually reduces it */
 823   relay3_client->padding_enabled = 1;
 824   client_relay3->padding_enabled = 1;
 825
 826   decision = channelpadding_decide_to_pad_channel(relay3_client);
 827   tt_int_op(decision, OP_EQ, CHANNELPADDING_PADLATER);
 828
 829   channelpadding_reduce_padding_on_channel(client_relay3);
 830
 831   tried_to_write_cell = 0;
 832   decision = channelpadding_decide_to_pad_channel(relay3_client);
 833   tt_int_op(decision, OP_EQ, CHANNELPADDING_WONTPAD);
 834
 835   get_options_mutable()->ORPort_set = 0;
 836   decision = channelpadding_decide_to_pad_channel(client_relay3);
 837   tt_int_op(decision, OP_EQ, CHANNELPADDING_PADLATER);
 838
 839   tt_assert(!client_relay3->pending_padding_callback);
 840   val = channelpadding_get_netflow_inactive_timeout_ms(client_relay3);
 841   tt_int_op(val, OP_GE, 9000);
 842   tt_int_op(val, OP_LE, 14000);
 843   int64_t val64 =
 844     channelpadding_compute_time_until_pad_for_netflow(client_relay3);
 845   tt_i64_op(val64, OP_LE, 14000);
 846
 847  done:
 848   free_mock_network();
 849   free_mock_consensus();
 850
 851   timers_shutdown();
 852   monotime_disable_test_mocking();
 853   channel_free_all();
 854
 855   return;
 856 }
 857
 858 void
 859 test_channelpadding_decide_to_pad_channel(void *arg)
 860 {
 861   channelpadding_decision_t decision;
 862   /**
 863    * Test case plan:
 864    *
 865    * 1. Channel that has "sent a packet" before the timeout.
 866    *    + We should decide to pad later
 867    * 2. Channel that has not "sent a packet" before the timeout:
 868    * 2a. Not within 1.1s of the timeout.
 869    *    + We should decide to pad later
 870    * 2b. Within 1.1s of the timemout.
 871    *    + We should schedule padding
 872    *    + We should get feedback that we wrote a cell
 873    * 2c. Within 0.1s of the timeout.
 874    *    + We should schedule padding
 875    *    + We should get feedback that we wrote a cell
 876    * 2d. Channel that asks to pad while timeout is scheduled
 877    *    + We should schedule padding
 878    *    + We should get feedback that we wrote a cell
 879    * 2e. 0s of the timeout
 880    *    + We should send padding immediately
 881    *    + We should get feedback that we wrote a cell
 882    * 2f. <0s of the timeout
 883    *    + We should send padding immediately
 884    *    + We should get feedback that we wrote a cell
 885    * 3. Channel that sends a packet while timeout is scheduled
 886    *    + We should not get feedback that we wrote a cell
 887    * 4. Channel that closes while timeout is scheduled
 888    *    + We should not get feedback that we wrote a cell
 889    * 5. Make sure the channel still would work if repaired
 890    *    + We should be able to schedule padding and resend
 891    * 6. Channel is not used for full circuits
 892    * 7. Channel that disappears while timeout is scheduled
 893    *    + We should not send padding
 894    */
 895   channel_t *chan;
 896   int64_t new_time;
 897   if (!connection_array)
 898     connection_array = smartlist_new();
 899   (void)arg;
 900
 901   tor_libevent_postfork();
 902
 903   monotime_init();
 904   monotime_enable_test_mocking();
 905   monotime_set_mock_time_nsec(1);
 906   monotime_coarse_set_mock_time_nsec(1);
 907   new_time = 1;
 908   monotime_coarse_t now;
 909   monotime_coarse_get(&now);
 910   timers_initialize();
 911   setup_full_capture_of_logs(LOG_WARN);
 912   channelpadding_new_consensus_params(NULL);
 913
 914   chan = (channel_t*)new_fake_channeltls(0);
 915   channel_timestamp_active(chan);
 916
 917   /* Test case #1: Channel that has "sent a packet" before the timeout. */
 918   tried_to_write_cell = 0;
 919   decision = channelpadding_decide_to_pad_channel(chan);
 920   tt_int_op(decision, OP_EQ, CHANNELPADDING_PADLATER);
 921   tt_assert(!chan->pending_padding_callback);
 922   tt_int_op(tried_to_write_cell, OP_EQ, 0);
 923
 924   /* Test case #2a: > 1.1s until timeout */
 925   tried_to_write_cell = 0;
 926   monotime_coarse_add_msec(&chan->next_padding_time, &now, 1200);
 927   decision = channelpadding_decide_to_pad_channel(chan);
 928   tt_int_op(decision, OP_EQ, CHANNELPADDING_PADLATER);
 929   tt_assert(!chan->pending_padding_callback);
 930   tt_int_op(tried_to_write_cell, OP_EQ, 0);
 931
 932   /* Test case #2b: >= 1.0s until timeout */
 933   tried_to_write_cell = 0;
 934   monotime_coarse_add_msec(&chan->next_padding_time, &now, 1000);
 935   decision = channelpadding_decide_to_pad_channel(chan);
 936   tt_int_op(decision, OP_EQ, CHANNELPADDING_PADDING_SCHEDULED);
 937   tt_assert(chan->pending_padding_callback);
 938   tt_int_op(tried_to_write_cell, OP_EQ, 0);
 939
 940   // Set up a timer for the <0 case below.
 941   monotime_coarse_t now_minus_100s;
 942   monotime_coarse_add_msec(&now_minus_100s, &now, 900);
 943   // Wait for the timer from case #2b
 944   new_time += 1000*NSEC_PER_MSEC;
 945   monotime_set_mock_time_nsec(new_time);
 946   monotime_coarse_set_mock_time_nsec(new_time);
 947   monotime_coarse_get(&now);
 948   timers_run_pending();
 949   tt_int_op(tried_to_write_cell, OP_EQ, 1);
 950   tt_assert(!chan->pending_padding_callback);
 951
 952   /* Test case #2c: > 0.1s until timeout */
 953   tried_to_write_cell = 0;
 954   monotime_coarse_add_msec(&chan->next_padding_time, &now, 100);
 955   decision = channelpadding_decide_to_pad_channel(chan);
 956   tt_int_op(decision, OP_EQ, CHANNELPADDING_PADDING_SCHEDULED);
 957   tt_assert(chan->pending_padding_callback);
 958   tt_int_op(tried_to_write_cell, OP_EQ, 0);
 959
 960   /* Test case #2d: Channel that asks to pad while timeout is scheduled */
 961   decision = channelpadding_decide_to_pad_channel(chan);
 962   tt_int_op(decision, OP_EQ, CHANNELPADDING_PADDING_ALREADY_SCHEDULED);
 963
 964   // Wait for the timer
 965   new_time += 101*NSEC_PER_MSEC;
 966   monotime_coarse_set_mock_time_nsec(new_time);
 967   monotime_set_mock_time_nsec(new_time);
 968   monotime_coarse_get(&now);
 969   timers_run_pending();
 970   tt_int_op(tried_to_write_cell, OP_EQ, 1);
 971   tt_assert(!chan->pending_padding_callback);
 972
 973   /* Test case #2e: 0s until timeout */
 974   tried_to_write_cell = 0;
 975   monotime_coarse_add_msec(&chan->next_padding_time, &now, 0);
 976   decision = channelpadding_decide_to_pad_channel(chan);
 977   tt_int_op(decision, OP_EQ, CHANNELPADDING_PADDING_SENT);
 978   tt_int_op(tried_to_write_cell, OP_EQ, 1);
 979   tt_assert(!chan->pending_padding_callback);
 980
 981   /* Test case #2f: <0s until timeout */
 982   tried_to_write_cell = 0;
 983   monotime_coarse_add_msec(&chan->next_padding_time, &now_minus_100s, 0);
 984   decision = channelpadding_decide_to_pad_channel(chan);
 985   tt_int_op(decision, OP_EQ, CHANNELPADDING_PADDING_SENT);
 986   tt_int_op(tried_to_write_cell, OP_EQ, 1);
 987   tt_assert(!chan->pending_padding_callback);
 988
 989   /* Test case #3: Channel that sends a packet while timeout is scheduled */
 990   tried_to_write_cell = 0;
 991   monotime_coarse_add_msec(&chan->next_padding_time, &now, 100);
 992   decision = channelpadding_decide_to_pad_channel(chan);
 993   tt_int_op(decision, OP_EQ, CHANNELPADDING_PADDING_SCHEDULED);
 994   tt_int_op(tried_to_write_cell, OP_EQ, 0);
 995   tt_assert(chan->pending_padding_callback);
 996
 997   // Pretend the channel sent a packet
 998   channel_timestamp_active(chan);
 999
1000   // We don't expect any timer callbacks here. Make a dummy one to be sure.
1001   // Wait for the timer
1002   new_time += 101*NSEC_PER_MSEC;
1003   monotime_coarse_set_mock_time_nsec(new_time);
1004   monotime_set_mock_time_nsec(new_time);
1005   monotime_coarse_get(&now);
1006   timers_run_pending();
1007
1008   tt_int_op(tried_to_write_cell, OP_EQ, 0);
1009   tt_assert(!chan->pending_padding_callback);
1010
1011   /* Test case #4: Channel that closes while a timeout is scheduled */
1012   tried_to_write_cell = 0;
1013   monotime_coarse_add_msec(&chan->next_padding_time, &now, 100);
1014   decision = channelpadding_decide_to_pad_channel(chan);
1015   tt_int_op(decision, OP_EQ, CHANNELPADDING_PADDING_SCHEDULED);
1016   tt_int_op(tried_to_write_cell, OP_EQ, 0);
1017   tt_assert(chan->pending_padding_callback);
1018
1019   // Pretend the channel is temporarily down
1020   chan->state = CHANNEL_STATE_MAINT;
1021
1022   // We don't expect any timer callbacks here. Make a dummy one to be sure.
1023   new_time += 101*NSEC_PER_MSEC;
1024   monotime_coarse_set_mock_time_nsec(new_time);
1025   monotime_set_mock_time_nsec(new_time);
1026   monotime_coarse_get(&now);
1027   timers_run_pending();
1028
1029   tt_int_op(tried_to_write_cell, OP_EQ, 0);
1030   tt_assert(!chan->pending_padding_callback);
1031   chan->state = CHANNEL_STATE_OPEN;
1032
1033   /* Test case #5: Make sure previous test case didn't break everything */
1034   tried_to_write_cell = 0;
1035   monotime_coarse_add_msec(&chan->next_padding_time, &now, 100);
1036   decision = channelpadding_decide_to_pad_channel(chan);
1037   tt_int_op(decision, OP_EQ, CHANNELPADDING_PADDING_SCHEDULED);
1038   tt_assert(chan->pending_padding_callback);
1039   tt_int_op(tried_to_write_cell, OP_EQ, 0);
1040
1041   // Wait for the timer
1042   new_time += 101*NSEC_PER_MSEC;
1043   monotime_coarse_set_mock_time_nsec(new_time);
1044   monotime_set_mock_time_nsec(new_time);
1045   monotime_coarse_get(&now);
1046   timers_run_pending();
1047
1048   tt_int_op(tried_to_write_cell, OP_EQ, 1);
1049   tt_assert(!chan->pending_padding_callback);
1050
1051   /* Test case #6. Channel is not used for full circuits */
1052   chan->channel_usage = CHANNEL_USED_NOT_USED_FOR_FULL_CIRCS;
1053   decision = channelpadding_decide_to_pad_channel(chan);
1054   tt_int_op(decision, OP_EQ, CHANNELPADDING_WONTPAD);
1055   tt_assert(!chan->pending_padding_callback);
1056   chan->channel_usage = CHANNEL_USED_FOR_FULL_CIRCS;
1057
1058   /* Test case #7. Channel is closed while timeout is scheduled.
1059    *
1060    * NOTE: This test deliberately breaks the channel callback mechanism.
1061    * It must be last.
1062    */
1063   tried_to_write_cell = 0;
1064   monotime_coarse_add_msec(&chan->next_padding_time, &now, 100);
1065   decision = channelpadding_decide_to_pad_channel(chan);
1066   tt_int_op(decision, OP_EQ, CHANNELPADDING_PADDING_SCHEDULED);
1067   tt_int_op(tried_to_write_cell, OP_EQ, 0);
1068   tt_assert(chan->pending_padding_callback);
1069
1070   // Close the connection while the timer is scheduled
1071   free_fake_channeltls((channel_tls_t*)chan);
1072
1073   // We don't expect any timer callbacks here. Make a dummy one to be sure.
1074   new_time = 101*NSEC_PER_MSEC;
1075   monotime_coarse_set_mock_time_nsec(new_time);
1076   monotime_set_mock_time_nsec(new_time);
1077   monotime_coarse_get(&now);
1078   timers_run_pending();
1079
1080   tt_int_op(tried_to_write_cell, OP_EQ, 0);
1081
1082  done:
1083   smartlist_free(connection_array);
1084
1085   teardown_capture_of_logs();
1086   monotime_disable_test_mocking();
1087   timers_shutdown();
1088   channel_free_all();
1089
1090   return;
1091 }
1092
1093 #define TEST_CHANNELPADDING(name, flags) \
1094     { #name, test_##name, (flags), NULL, NULL }
1095
1096 struct testcase_t channelpadding_tests[] = {
1097   //TEST_CHANNELPADDING(channelpadding_decide_to_pad_channel, 0),
1098   TEST_CHANNELPADDING(channelpadding_decide_to_pad_channel, TT_FORK),
1099   TEST_CHANNELPADDING(channelpadding_negotiation, TT_FORK),
1100   TEST_CHANNELPADDING(channelpadding_consensus, TT_FORK),
1101   TEST_CHANNELPADDING(channelpadding_killonehop, TT_FORK),
1102   TEST_CHANNELPADDING(channelpadding_timers, TT_FORK),
1103   END_OF_TESTCASES
1104 };