GNUnet  0.11.x
gnunet-service-nse.c
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1 /*
2  This file is part of GNUnet.
3  Copyright (C) 2009, 2010, 2011, 2012, 2013, 2016 GNUnet e.V.
4 
5  GNUnet is free software: you can redistribute it and/or modify it
6  under the terms of the GNU Affero General Public License as published
7  by the Free Software Foundation, either version 3 of the License,
8  or (at your option) any later version.
9 
10  GNUnet is distributed in the hope that it will be useful, but
11  WITHOUT ANY WARRANTY; without even the implied warranty of
12  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13  Affero General Public License for more details.
14 
15  You should have received a copy of the GNU Affero General Public License
16  along with this program. If not, see <http://www.gnu.org/licenses/>.
17 
18  SPDX-License-Identifier: AGPL3.0-or-later
19  */
20 
38 #include "platform.h"
39 #include <math.h>
40 #include "gnunet_util_lib.h"
41 #include "gnunet_constants.h"
42 #include "gnunet_protocols.h"
43 #include "gnunet_signatures.h"
45 #include "gnunet_core_service.h"
46 #include "gnunet_nse_service.h"
47 #if ENABLE_NSE_HISTOGRAM
49 #endif
50 #include "nse.h"
51 #include <gcrypt.h>
52 
53 
58 #define USE_RANDOM_DELAYS GNUNET_YES
59 
63 #define DEBUG_NSE GNUNET_NO
64 
68 #define HISTORY_SIZE 64
69 
74 #define NSE_PRIORITY \
75  (GNUNET_MQ_PRIO_BACKGROUND | GNUNET_MQ_PREF_UNRELIABLE \
76  | GNUNET_MQ_PREF_CORK_ALLOWED)
77 
78 #if FREEBSD
79 #define log2(a) (log (a) / log (2))
80 #endif
81 
85 static unsigned long long nse_work_required;
86 
91 
96 
97 #if ENABLE_NSE_HISTOGRAM
98 
102 struct GNUNET_CLIENT_TestHandle *logger_test;
103 
107 static struct GNUNET_TESTBED_LOGGER_Handle *lh;
108 
112 static struct GNUNET_BIO_WriteHandle *histogram;
113 
114 #endif
115 
116 
121 {
126 
130  const struct GNUNET_PeerIdentity *id;
131 
136 
143 
144 #if ENABLE_NSE_HISTOGRAM
145 
148  unsigned int received_messages;
149 
153  unsigned int transmitted_messages;
154 
158  unsigned int last_transmitted_size;
159 #endif
160 };
161 
162 
164 
171 {
175  struct GNUNET_MessageHeader header;
176 
180  uint32_t hop_count GNUNET_PACKED;
181 
186 
191  struct GNUNET_TIME_AbsoluteNBO timestamp;
192 
199 
203  struct GNUNET_PeerIdentity origin;
204 
208  uint64_t proof_of_work GNUNET_PACKED;
209 
214 };
216 
220 static const struct GNUNET_CONFIGURATION_Handle *cfg;
221 
226 
231 
236 
241 static double current_size_estimate;
242 
247 static double current_std_dev = NAN;
248 
252 static uint32_t hop_count_max;
253 
258 
263 
267 static unsigned int estimate_index;
268 
272 static unsigned int estimate_count;
273 
278 
283 
288 
293 
298 
303 
308 
312 static uint64_t my_proof;
313 
314 
321 static void
323 {
324  double mean;
325  double sum;
326  double std_dev;
327  double variance;
328  double val;
329  double nsize;
330 
331 #define WEST 1
332  /* Weighted incremental algorithm for stddev according to West (1979) */
333 #if WEST
334  double sumweight;
335  double weight;
336  double q;
337  double r;
338  double temp;
339 
340  mean = 0.0;
341  sum = 0.0;
342  sumweight = 0.0;
343  variance = 0.0;
344  for (unsigned int i = 0; i < estimate_count; i++)
345  {
346  unsigned int j = (estimate_index - i + HISTORY_SIZE) % HISTORY_SIZE;
347 
348  val = htonl (size_estimate_messages[j].matching_bits);
349  weight = estimate_count + 1 - i;
350 
351  temp = weight + sumweight;
352  q = val - mean;
353  r = q * weight / temp;
354  mean += r;
355  sum += sumweight * q * r;
356  sumweight = temp;
357  }
358  if (estimate_count > 0)
359  variance = (sum / sumweight) * estimate_count / (estimate_count - 1.0);
360 #else
361  /* trivial version for debugging */
362  double vsq;
363 
364  /* non-weighted trivial version */
365  sum = 0.0;
366  vsq = 0.0;
367  variance = 0.0;
368  mean = 0.0;
369 
370  for (unsigned int i = 0; i < estimate_count; i++)
371  {
372  unsigned int j = (estimate_index - i + HISTORY_SIZE) % HISTORY_SIZE;
373 
374  val = htonl (size_estimate_messages[j].matching_bits);
375  sum += val;
376  vsq += val * val;
377  }
378  if (0 != estimate_count)
379  {
380  mean = sum / estimate_count;
381  variance = (vsq - mean * sum)
382  / (estimate_count - 1.0); // terrible for numerical stability...
383  }
384 #endif
385  if (variance >= 0)
386  std_dev = sqrt (variance);
387  else
388  std_dev = variance; /* must be infinity due to estimate_count == 0 */
389  current_std_dev = std_dev;
390  current_size_estimate = mean;
391 
392  em->header.size = htons (sizeof(struct GNUNET_NSE_ClientMessage));
394  em->reserved = htonl (0);
396  {
397  double se = mean - 0.332747;
398  unsigned int j = GNUNET_CONTAINER_multipeermap_size (peers);
399  if (0 == j)
400  j = 1; /* Avoid log2(0); can only happen if CORE didn't report
401  connection to self yet */
402  nsize = log2 (j);
403  em->size_estimate = GNUNET_hton_double (GNUNET_MAX (se, nsize));
404  em->std_deviation = GNUNET_hton_double (std_dev);
405  GNUNET_STATISTICS_set (stats,
406  "# nodes in the network (estimate)",
407  (uint64_t) pow (2, GNUNET_MAX (se, nsize)),
408  GNUNET_NO);
409  }
410 }
411 
412 
422 static void
423 handle_start (void *cls, const struct GNUNET_MessageHeader *message)
424 {
425  struct GNUNET_SERVICE_Client *client = cls;
426  struct GNUNET_MQ_Handle *mq;
427  struct GNUNET_NSE_ClientMessage em;
428  struct GNUNET_MQ_Envelope *env;
429 
430  (void) message;
431  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received START message from client\n");
432  mq = GNUNET_SERVICE_client_get_mq (client);
435  env = GNUNET_MQ_msg_copy (&em.header);
436  GNUNET_MQ_send (mq, env);
438 }
439 
440 
447 static double
449 {
450  /* Calculated as: S + f/2 - (f / pi) * (atan(x - p')) */
451  // S is next_timestamp (ignored in return value)
452  // f is frequency (gnunet_nse_interval)
453  // x is matching_bits
454  // p' is current_size_estimate
455  return ((double) gnunet_nse_interval.rel_value_us / (double) 2.0)
457  * atan (matching_bits - current_size_estimate));
458 }
459 
460 
467 static struct GNUNET_TIME_Relative
469 {
470 #if USE_RANDOM_DELAYS
471  struct GNUNET_TIME_Relative ret;
472  uint32_t i;
473  double d;
474 
476  i = (uint32_t) (d / (double) (hop_count_max + 1));
477  ret.rel_value_us = i;
479  "Randomizing flood using latencies up to %s\n",
481  ret.rel_value_us =
483  return ret;
484 #else
485  return GNUNET_TIME_UNIT_ZERO;
486 #endif
487 }
488 
489 
497 static void
498 pow_hash (const void *buf, size_t buf_len, struct GNUNET_HashCode *result)
499 {
500  GNUNET_break (
501  0 == gcry_kdf_derive (buf,
502  buf_len,
503  GCRY_KDF_SCRYPT,
504  1 /* subalgo */,
505  "gnunet-proof-of-work",
506  strlen ("gnunet-proof-of-work"),
507  2 /* iterations; keep cost of individual op small */,
508  sizeof(struct GNUNET_HashCode),
509  result));
510 }
511 
512 
520 static uint32_t
522  const struct GNUNET_PeerIdentity *id)
523 {
524  struct GNUNET_HashCode timestamp_hash;
525  struct GNUNET_HashCode pid_hash;
526 
527  GNUNET_CRYPTO_hash (&timestamp.abs_value_us,
528  sizeof(timestamp.abs_value_us),
529  &timestamp_hash);
530  GNUNET_CRYPTO_hash (id, sizeof(struct GNUNET_PeerIdentity), &pid_hash);
531  return GNUNET_CRYPTO_hash_matching_bits (&timestamp_hash, &pid_hash);
532 }
533 
534 
543 static struct GNUNET_TIME_Relative
544 get_transmit_delay (int round_offset)
545 {
546  struct GNUNET_TIME_Relative ret;
547  struct GNUNET_TIME_Absolute tgt;
548  double dist_delay;
549  uint32_t matching_bits;
550 
551  switch (round_offset)
552  {
553  case -1:
554  /* previous round is randomized between 0 and 50 ms */
555 #if USE_RANDOM_DELAYS
556  ret.rel_value_us =
558 #else
559  ret = GNUNET_TIME_UNIT_ZERO;
560 #endif
562  "Transmitting previous round behind schedule in %s\n",
564  return ret;
565 
566  case 0:
567  /* current round is based on best-known matching_bits */
568  matching_bits =
569  ntohl (size_estimate_messages[estimate_index].matching_bits);
570  dist_delay = get_matching_bits_delay (matching_bits);
571  dist_delay += get_delay_randomization (matching_bits).rel_value_us;
572  ret.rel_value_us = (uint64_t) dist_delay;
574  "For round %s, delay for %u matching bits is %s\n",
576  (unsigned int) matching_bits,
578  /* now consider round start time and add delay to it */
581  }
582  GNUNET_break (0);
584 }
585 
586 
592 static void
593 transmit_task_cb (void *cls)
594 {
595  struct NSEPeerEntry *peer_entry = cls;
596  unsigned int idx;
597  struct GNUNET_MQ_Envelope *env;
598 
599  peer_entry->transmit_task = NULL;
600  idx = estimate_index;
601  if (GNUNET_NO == peer_entry->previous_round)
602  {
603  idx = (idx + HISTORY_SIZE - 1) % HISTORY_SIZE;
604  peer_entry->previous_round = GNUNET_YES;
605  peer_entry->transmit_task =
608  peer_entry);
609  }
610  if ((0 == ntohl (size_estimate_messages[idx].hop_count)) &&
611  (NULL != proof_task))
612  {
614  "# flood messages not generated (no proof yet)",
615  1,
616  GNUNET_NO);
617  return;
618  }
619  if (0 == ntohs (size_estimate_messages[idx].header.size))
620  {
622  "# flood messages not generated (lack of history)",
623  1,
624  GNUNET_NO);
625  return;
626  }
628  "In round %s, sending to `%s' estimate with %u bits\n",
631  size_estimate_messages[idx].timestamp)),
632  GNUNET_i2s (peer_entry->id),
633  (unsigned int) ntohl (size_estimate_messages[idx].matching_bits));
634  if (0 == ntohl (size_estimate_messages[idx].hop_count))
635  GNUNET_STATISTICS_update (stats, "# flood messages started", 1, GNUNET_NO);
637  "# flood messages transmitted",
638  1,
639  GNUNET_NO);
640 #if ENABLE_NSE_HISTOGRAM
641  peer_entry->transmitted_messages++;
642  peer_entry->last_transmitted_size =
643  ntohl (size_estimate_messages[idx].matching_bits);
644 #endif
645  env = GNUNET_MQ_msg_copy (&size_estimate_messages[idx].header);
646  GNUNET_MQ_send (peer_entry->mq, env);
647 }
648 
649 
656 static void
658 {
659  struct GNUNET_NSE_ClientMessage em;
660 
663 }
664 
665 
673 static void
674 setup_flood_message (unsigned int slot, struct GNUNET_TIME_Absolute ts)
675 {
676  struct GNUNET_NSE_FloodMessage *fm;
677  uint32_t matching_bits;
678 
679  matching_bits = get_matching_bits (ts, &my_identity);
680  fm = &size_estimate_messages[slot];
681  fm->header.size = htons (sizeof(struct GNUNET_NSE_FloodMessage));
683  fm->hop_count = htonl (0);
685  fm->purpose.size =
686  htonl (sizeof(struct GNUNET_NSE_FloodMessage)
687  - sizeof(struct GNUNET_MessageHeader) - sizeof(uint32_t)
688  - sizeof(struct GNUNET_CRYPTO_EddsaSignature));
689  fm->matching_bits = htonl (matching_bits);
691  fm->origin = my_identity;
692  fm->proof_of_work = my_proof;
693  if (nse_work_required > 0)
695  &fm->purpose,
696  &fm->signature));
697  else
698  memset (&fm->signature, 0, sizeof(fm->signature));
699 }
700 
701 
711 static int
713  const struct GNUNET_PeerIdentity *key,
714  void *value)
715 {
716  struct NSEPeerEntry *peer_entry = value;
717  struct GNUNET_TIME_Relative delay;
718 
719  (void) cls;
720  (void) key;
721  if (NULL != peer_entry->transmit_task)
722  {
724  peer_entry->previous_round = GNUNET_NO;
725  }
726 #if ENABLE_NSE_HISTOGRAM
727  if (peer_entry->received_messages > 1)
729  "# extra messages",
730  peer_entry->received_messages - 1,
731  GNUNET_NO);
732  peer_entry->transmitted_messages = 0;
733  peer_entry->last_transmitted_size = 0;
734  peer_entry->received_messages = 0;
735 #endif
736  delay =
737  get_transmit_delay ((GNUNET_NO == peer_entry->previous_round) ? -1 : 0);
738  peer_entry->transmit_task =
739  GNUNET_SCHEDULER_add_delayed (delay, &transmit_task_cb, peer_entry);
740  return GNUNET_OK;
741 }
742 
743 
749 static void
751 {
752  struct GNUNET_TIME_Relative offset;
753 
754  (void) cls;
755  flood_task = NULL;
757  if (0 != offset.rel_value_us)
758  {
759  /* somehow run early, delay more */
760  flood_task =
762  return;
763  }
766  estimate_count++;
773  ntohl (next_message.matching_bits)))
774  {
775  /* we received a message for this round way early, use it! */
778  htonl (1 + ntohl (next_message.hop_count));
779  }
780  else
782  next_message.matching_bits = htonl (0); /* reset for 'next' round */
783  hop_count_max = 0;
784  for (unsigned int i = 0; i < HISTORY_SIZE; i++)
785  hop_count_max =
786  GNUNET_MAX (ntohl (size_estimate_messages[i].hop_count), hop_count_max);
788  flood_task =
790 }
791 
792 
799 static unsigned int
801 {
802  unsigned int hash_count;
803 
804  hash_count = 0;
805  while (0 == GNUNET_CRYPTO_hash_get_bit (hash, hash_count))
806  hash_count++;
807  return hash_count;
808 }
809 
810 
819 static int
821  uint64_t val)
822 {
823  char buf[sizeof(struct GNUNET_CRYPTO_EddsaPublicKey)
824  + sizeof(val)] GNUNET_ALIGN;
825  struct GNUNET_HashCode result;
826 
827  GNUNET_memcpy (buf, &val, sizeof(val));
828  GNUNET_memcpy (&buf[sizeof(val)],
829  pkey,
830  sizeof(struct GNUNET_CRYPTO_EddsaPublicKey));
831  pow_hash (buf, sizeof(buf), &result);
832  return (count_leading_zeroes (&result) >= nse_work_required) ? GNUNET_YES
833  : GNUNET_NO;
834 }
835 
836 
840 static void
842 {
843  char *proof;
844 
845  if (GNUNET_OK !=
846  GNUNET_CONFIGURATION_get_value_filename (cfg, "NSE", "PROOFFILE", &proof))
847  return;
848  if (sizeof(my_proof) != GNUNET_DISK_fn_write (proof,
849  &my_proof,
850  sizeof(my_proof),
854  GNUNET_free (proof);
855 }
856 
857 
863 static void
864 find_proof (void *cls)
865 {
866 #define ROUND_SIZE 10
867  uint64_t counter;
868  char buf[sizeof(struct GNUNET_CRYPTO_EddsaPublicKey)
869  + sizeof(uint64_t)] GNUNET_ALIGN;
870  struct GNUNET_HashCode result;
871  unsigned int i;
872 
873  (void) cls;
874  proof_task = NULL;
875  GNUNET_memcpy (&buf[sizeof(uint64_t)],
876  &my_identity,
877  sizeof(struct GNUNET_PeerIdentity));
878  i = 0;
879  counter = my_proof;
880  while ((counter != UINT64_MAX) && (i < ROUND_SIZE))
881  {
882  GNUNET_memcpy (buf, &counter, sizeof(uint64_t));
883  pow_hash (buf, sizeof(buf), &result);
884  if (nse_work_required <= count_leading_zeroes (&result))
885  {
886  my_proof = counter;
888  "Proof of work found: %llu!\n",
889  (unsigned long long) GNUNET_ntohll (counter));
890  write_proof ();
892  return;
893  }
894  counter++;
895  i++;
896  }
897  if (my_proof / (100 * ROUND_SIZE) < counter / (100 * ROUND_SIZE))
898  {
900  "Testing proofs currently at %llu\n",
901  (unsigned long long) counter);
902  /* remember progress every 100 rounds */
903  my_proof = counter;
904  write_proof ();
905  }
906  else
907  {
908  my_proof = counter;
909  }
910  proof_task =
913  &find_proof,
914  NULL);
915 }
916 
917 
927 static int
928 verify_message_crypto (const struct GNUNET_NSE_FloodMessage *incoming_flood)
929 {
930  if (GNUNET_YES != check_proof_of_work (&incoming_flood->origin.public_key,
931  incoming_flood->proof_of_work))
932  {
934  "Proof of work invalid: %llu!\n",
935  (unsigned long long) GNUNET_ntohll (
936  incoming_flood->proof_of_work));
937  GNUNET_break_op (0);
938  return GNUNET_NO;
939  }
940  if ((nse_work_required > 0) &&
941  (GNUNET_OK !=
943  &incoming_flood->purpose,
944  &incoming_flood->signature,
945  &incoming_flood->origin.public_key)))
946  {
947  GNUNET_break_op (0);
948  return GNUNET_NO;
949  }
950  return GNUNET_YES;
951 }
952 
953 
963 static int
965  const struct GNUNET_PeerIdentity *key,
966  void *value)
967 {
968  struct NSEPeerEntry *exclude = cls;
969  struct NSEPeerEntry *peer_entry = value;
970  struct GNUNET_TIME_Relative delay;
971 
972  (void) key;
973  if (peer_entry == exclude)
974  return GNUNET_OK; /* trigger of the update */
975  if (GNUNET_NO == peer_entry->previous_round)
976  {
977  /* still stuck in previous round, no point to update, check that
978  * we are active here though... */
979  if (NULL == peer_entry->transmit_task)
980  {
981  GNUNET_break (0);
982  }
983  return GNUNET_OK;
984  }
985  if (NULL != peer_entry->transmit_task)
986  {
988  peer_entry->transmit_task = NULL;
989  }
990  delay = get_transmit_delay (0);
991  peer_entry->transmit_task =
992  GNUNET_SCHEDULER_add_delayed (delay, &transmit_task_cb, peer_entry);
993  return GNUNET_OK;
994 }
995 
996 
1003 static void
1005  const struct GNUNET_NSE_FloodMessage *incoming_flood)
1006 {
1007  struct NSEPeerEntry *peer_entry = cls;
1008  struct GNUNET_TIME_Absolute ts;
1009  uint32_t matching_bits;
1010  unsigned int idx;
1011 
1012 #if ENABLE_NSE_HISTOGRAM
1013  {
1014  uint64_t t;
1015 
1017  if (NULL != lh)
1018  GNUNET_TESTBED_LOGGER_write (lh, &t, sizeof(uint64_t));
1019  if (NULL != histogram)
1020  GNUNET_BIO_write_int64 (histogram, t);
1021  }
1022 #endif
1023  GNUNET_STATISTICS_update (stats, "# flood messages received", 1, GNUNET_NO);
1024  matching_bits = ntohl (incoming_flood->matching_bits);
1025 #if DEBUG_NSE
1026  {
1027  char origin[5];
1028  char pred[5];
1029  struct GNUNET_PeerIdentity os;
1030 
1031  GNUNET_snprintf (origin,
1032  sizeof(origin),
1033  "%s",
1034  GNUNET_i2s (&incoming_flood->origin));
1035  GNUNET_snprintf (pred, sizeof(pred), "%s", GNUNET_i2s (peer_entry->id));
1037  "Flood at %s from `%s' via `%s' at `%s' with bits %u\n",
1039  GNUNET_TIME_absolute_ntoh (incoming_flood->timestamp)),
1040  origin,
1041  pred,
1043  (unsigned int) matching_bits);
1044  }
1045 #endif
1046 
1047 #if ENABLE_NSE_HISTOGRAM
1048  peer_entry->received_messages++;
1049  if ((peer_entry->transmitted_messages > 0) &&
1050  (peer_entry->last_transmitted_size >= matching_bits) )
1051  GNUNET_STATISTICS_update (stats, "# cross messages", 1, GNUNET_NO);
1052 #endif
1053 
1054  ts = GNUNET_TIME_absolute_ntoh (incoming_flood->timestamp);
1056  idx = estimate_index;
1057  else if (ts.abs_value_us ==
1059  idx = (estimate_index + HISTORY_SIZE - 1) % HISTORY_SIZE;
1060  else if (ts.abs_value_us == next_timestamp.abs_value_us)
1061  {
1062  if (matching_bits <= ntohl (next_message.matching_bits))
1063  return; /* ignore, simply too early/late */
1064  if (GNUNET_YES != verify_message_crypto (incoming_flood))
1065  {
1067  "Peer %s is likely ill-configured!\n",
1068  GNUNET_i2s (peer_entry->id));
1069  GNUNET_break_op (0);
1070  return;
1071  }
1072  next_message = *incoming_flood;
1073  return;
1074  }
1075  else
1076  {
1077  GNUNET_STATISTICS_update (stats,
1078  "# flood messages discarded (clock skew too large)",
1079  1,
1080  GNUNET_NO);
1081  return;
1082  }
1083  if (0 == (GNUNET_memcmp (peer_entry->id, &my_identity)))
1084  {
1085  /* send to self, update our own estimate IF this also comes from us! */
1086  if (0 == GNUNET_memcmp (&incoming_flood->origin, &my_identity))
1088  return;
1089  }
1090  if (matching_bits == ntohl (size_estimate_messages[idx].matching_bits))
1091  {
1092  /* Cancel transmission in the other direction, as this peer clearly has
1093  up-to-date information already. Even if we didn't talk to this peer in
1094  the previous round, we should no longer send it stale information as it
1095  told us about the current round! */
1096  peer_entry->previous_round = GNUNET_YES;
1097  if (idx != estimate_index)
1098  {
1099  /* do not transmit information for the previous round to this peer
1100  anymore (but allow current round) */
1101  return;
1102  }
1103  /* got up-to-date information for current round, cancel transmission to
1104  * this peer altogether */
1105  if (NULL != peer_entry->transmit_task)
1106  {
1107  GNUNET_SCHEDULER_cancel (peer_entry->transmit_task);
1108  peer_entry->transmit_task = NULL;
1109  }
1110  return;
1111  }
1112  if (matching_bits < ntohl (size_estimate_messages[idx].matching_bits))
1113  {
1114  if ((idx < estimate_index) && (peer_entry->previous_round == GNUNET_YES))
1115  {
1116  peer_entry->previous_round = GNUNET_NO;
1117  }
1118  /* push back our result now, that peer is spreading bad information... */
1119  if (NULL != peer_entry->transmit_task)
1120  GNUNET_SCHEDULER_cancel (peer_entry->transmit_task);
1121  peer_entry->transmit_task =
1123  /* Not closer than our most recent message, no need to do work here */
1124  GNUNET_STATISTICS_update (stats,
1125  "# flood messages ignored (had closer already)",
1126  1,
1127  GNUNET_NO);
1128  return;
1129  }
1130  if (GNUNET_YES != verify_message_crypto (incoming_flood))
1131  {
1132  GNUNET_break_op (0);
1133  return;
1134  }
1135  GNUNET_assert (matching_bits >
1136  ntohl (size_estimate_messages[idx].matching_bits));
1137  /* Cancel transmission in the other direction, as this peer clearly has
1138  * up-to-date information already.
1139  */
1140  peer_entry->previous_round = GNUNET_YES;
1141  if (idx == estimate_index)
1142  {
1143  /* cancel any activity for current round */
1144  if (NULL != peer_entry->transmit_task)
1145  {
1146  GNUNET_SCHEDULER_cancel (peer_entry->transmit_task);
1147  peer_entry->transmit_task = NULL;
1148  }
1149  }
1150  size_estimate_messages[idx] = *incoming_flood;
1152  htonl (ntohl (incoming_flood->hop_count) + 1);
1153  hop_count_max =
1154  GNUNET_MAX (ntohl (incoming_flood->hop_count) + 1, hop_count_max);
1155  GNUNET_STATISTICS_set (stats,
1156  "# estimated network diameter",
1157  hop_count_max,
1158  GNUNET_NO);
1159 
1160  /* have a new, better size estimate, inform clients */
1162 
1163  /* flood to rest */
1166  peer_entry);
1167 }
1168 
1169 
1177 static void *
1179  const struct GNUNET_PeerIdentity *peer,
1180  struct GNUNET_MQ_Handle *mq)
1181 {
1182  struct NSEPeerEntry *peer_entry;
1183 
1184  (void) cls;
1186  "Peer `%s' connected to us\n",
1187  GNUNET_i2s (peer));
1188  /* set our default transmission options */
1190  /* create our peer entry for this peer */
1191  peer_entry = GNUNET_new (struct NSEPeerEntry);
1192  peer_entry->id = peer;
1193  peer_entry->mq = mq;
1196  peers,
1197  peer_entry->id,
1198  peer_entry,
1200  peer_entry->transmit_task =
1203  peer_entry);
1204  GNUNET_STATISTICS_update (stats, "# peers connected", 1, GNUNET_NO);
1205  return peer_entry;
1206 }
1207 
1208 
1217 static void
1219  const struct GNUNET_PeerIdentity *peer,
1220  void *internal_cls)
1221 {
1222  struct NSEPeerEntry *pos = internal_cls;
1223 
1224  (void) cls;
1226  "Peer `%s' disconnected from us\n",
1227  GNUNET_i2s (peer));
1229  GNUNET_CONTAINER_multipeermap_remove (peers, peer, pos));
1230  if (NULL != pos->transmit_task)
1231  {
1233  pos->transmit_task = NULL;
1234  }
1235  GNUNET_free (pos);
1236  GNUNET_STATISTICS_update (stats, "# peers connected", -1, GNUNET_NO);
1237 }
1238 
1239 
1240 #if ENABLE_NSE_HISTOGRAM
1241 
1248 static void
1249 flush_comp_cb (void *cls, size_t size)
1250 {
1251  (void) cls;
1252  (void) size;
1254  lh = NULL;
1255 }
1256 
1257 
1258 #endif
1259 
1260 
1266 static void
1267 shutdown_task (void *cls)
1268 {
1269  (void) cls;
1270  if (NULL != flood_task)
1271  {
1272  GNUNET_SCHEDULER_cancel (flood_task);
1273  flood_task = NULL;
1274  }
1275  if (NULL != proof_task)
1276  {
1277  GNUNET_SCHEDULER_cancel (proof_task);
1278  proof_task = NULL;
1279  write_proof (); /* remember progress */
1280  }
1281  if (NULL != nc)
1282  {
1284  nc = NULL;
1285  }
1286  if (NULL != core_api)
1287  {
1288  GNUNET_CORE_disconnect (core_api);
1289  core_api = NULL;
1290  }
1291  if (NULL != stats)
1292  {
1294  stats = NULL;
1295  }
1296  if (NULL != peers)
1297  {
1299  peers = NULL;
1300  }
1301  if (NULL != my_private_key)
1302  {
1303  GNUNET_free (my_private_key);
1304  my_private_key = NULL;
1305  }
1306 #if ENABLE_NSE_HISTOGRAM
1307  if (NULL != logger_test)
1308  {
1309  GNUNET_CLIENT_service_test_cancel (logger_test);
1310  logger_test = NULL;
1311  }
1312  if (NULL != lh)
1313  {
1314  GNUNET_TESTBED_LOGGER_flush (lh, &flush_comp_cb, NULL);
1315  }
1316  if (NULL != histogram)
1317  {
1318  GNUNET_BIO_write_close (histogram);
1319  histogram = NULL;
1320  }
1321 #endif
1322 }
1323 
1324 
1331 static void
1332 core_init (void *cls, const struct GNUNET_PeerIdentity *identity)
1333 {
1334  struct GNUNET_TIME_Absolute now;
1335  struct GNUNET_TIME_Absolute prev_time;
1336 
1337  (void) cls;
1338  if (NULL == identity)
1339  {
1340  GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Connection to core FAILED!\n");
1342  return;
1343  }
1344  GNUNET_assert (0 == GNUNET_memcmp (&my_identity, identity));
1345  now = GNUNET_TIME_absolute_get ();
1349  next_timestamp =
1352  estimate_count = 0;
1354  {
1355  int idx = (estimate_index + HISTORY_SIZE - 1) % HISTORY_SIZE;
1356  prev_time.abs_value_us =
1358  setup_flood_message (idx, prev_time);
1360  estimate_count++;
1361  }
1362  flood_task =
1364 }
1365 
1366 
1367 #if ENABLE_NSE_HISTOGRAM
1368 
1376 static void
1377 status_cb (void *cls, int status)
1378 {
1379  (void) cls;
1380  logger_test = NULL;
1381  if (GNUNET_YES != status)
1382  {
1383  GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Testbed logger not running\n");
1384  return;
1385  }
1386  if (NULL == (lh = GNUNET_TESTBED_LOGGER_connect (cfg)))
1387  {
1389  "Cannot connect to the testbed logger. Exiting.\n");
1391  }
1392 }
1393 
1394 
1395 #endif
1396 
1397 
1405 static void
1406 run (void *cls,
1407  const struct GNUNET_CONFIGURATION_Handle *c,
1409 {
1410  struct GNUNET_MQ_MessageHandler core_handlers[] =
1411  { GNUNET_MQ_hd_fixed_size (p2p_estimate,
1413  struct GNUNET_NSE_FloodMessage,
1414  NULL),
1415  GNUNET_MQ_handler_end () };
1416  char *proof;
1418 
1419  (void) cls;
1420  (void) service;
1421  cfg = c;
1423  "NSE",
1424  "INTERVAL",
1426  {
1429  return;
1430  }
1432  "NSE",
1433  "WORKDELAY",
1434  &proof_find_delay))
1435  {
1436  GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR, "NSE", "WORKDELAY");
1438  return;
1439  }
1441  "NSE",
1442  "WORKBITS",
1444  {
1447  return;
1448  }
1449  if (nse_work_required >= sizeof(struct GNUNET_HashCode) * 8)
1450  {
1452  "NSE",
1453  "WORKBITS",
1454  _ ("Value is too large.\n"));
1456  return;
1457  }
1458 
1459 #if ENABLE_NSE_HISTOGRAM
1460  {
1461  char *histogram_dir;
1462  char *histogram_fn;
1463 
1465  "NSE",
1466  "HISTOGRAM_DIR",
1467  &histogram_dir))
1468  {
1469  GNUNET_assert (
1470  0 < GNUNET_asprintf (&histogram_fn, "%s/timestamps", histogram_dir));
1471  GNUNET_free (histogram_dir);
1472  histogram = GNUNET_BIO_write_open (histogram_fn);
1473  if (NULL == histogram)
1475  "Unable to open histogram file `%s'\n",
1476  histogram_fn);
1477  GNUNET_free (histogram_fn);
1478  }
1479  logger_test = GNUNET_CLIENT_service_test ("testbed-logger",
1480  cfg,
1482  &status_cb,
1483  NULL);
1484  }
1485 #endif
1486 
1489  GNUNET_assert (NULL != pk);
1490  my_private_key = pk;
1492  if (GNUNET_OK !=
1493  GNUNET_CONFIGURATION_get_value_filename (cfg, "NSE", "PROOFFILE", &proof))
1494  {
1495  GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR, "NSE", "PROOFFILE");
1496  GNUNET_free (my_private_key);
1497  my_private_key = NULL;
1499  return;
1500  }
1501  if ((GNUNET_YES != GNUNET_DISK_file_test (proof)) ||
1502  (sizeof(my_proof) !=
1503  GNUNET_DISK_fn_read (proof, &my_proof, sizeof(my_proof))))
1504  my_proof = 0;
1505  GNUNET_free (proof);
1506  proof_task =
1508  &find_proof,
1509  NULL);
1510 
1513  /* Connect to core service and register core handlers */
1514  core_api =
1515  GNUNET_CORE_connect (cfg, /* Main configuration */
1516  NULL, /* Closure passed to functions */
1517  &core_init, /* Call core_init once connected */
1518  &handle_core_connect, /* Handle connects */
1519  &handle_core_disconnect, /* Handle disconnects */
1520  core_handlers); /* Register these handlers */
1521  if (NULL == core_api)
1522  {
1524  return;
1525  }
1526  stats = GNUNET_STATISTICS_create ("nse", cfg);
1527 }
1528 
1529 
1538 static void *
1540  struct GNUNET_SERVICE_Client *c,
1541  struct GNUNET_MQ_Handle *mq)
1542 {
1543  (void) cls;
1544  (void) mq;
1545  return c;
1546 }
1547 
1548 
1556 static void
1558  struct GNUNET_SERVICE_Client *c,
1559  void *internal_cls)
1560 {
1561  (void) cls;
1562  GNUNET_assert (c == internal_cls);
1563 }
1564 
1565 
1569 GNUNET_SERVICE_MAIN ("nse",
1571  &run,
1574  NULL,
1577  struct GNUNET_MessageHeader,
1578  NULL),
1580 
1581 
1582 #if defined(LINUX) && defined(__GLIBC__)
1583 #include <malloc.h>
1584 
1588 void __attribute__ ((constructor))
1589 GNUNET_ARM_memory_init ()
1590 {
1591  mallopt (M_TRIM_THRESHOLD, 4 * 1024);
1592  mallopt (M_TOP_PAD, 1 * 1024);
1593  malloc_trim (0);
1594 }
1595 
1596 
1597 #endif
1598 
1599 
1600 /* end of gnunet-service-nse.c */
#define GNUNET_MESSAGE_TYPE_NSE_START
client->service message indicating start
int GNUNET_DISK_file_test(const char *fil)
Check that fil corresponds to a filename (of a file that exists and that is not a directory)...
Definition: disk.c:544
static struct GNUNET_SERVICE_Handle * service
Handle to our service instance.
struct GNUNET_MQ_Envelope * GNUNET_MQ_msg_copy(const struct GNUNET_MessageHeader *hdr)
Create a new envelope by copying an existing message.
Definition: mq.c:653
The notification context is the key datastructure for a convenience API used for transmission of noti...
Definition: nc.c:75
static struct GNUNET_CRYPTO_EddsaPrivateKey * pk
Private key of this peer.
int previous_round
Did we receive or send a message about the previous round to this peer yet? GNUNET_YES if the previou...
int GNUNET_CONFIGURATION_get_value_time(const struct GNUNET_CONFIGURATION_Handle *cfg, const char *section, const char *option, struct GNUNET_TIME_Relative *time)
Get a configuration value that should be a relative time.
struct GNUNET_TIME_Absolute GNUNET_TIME_absolute_ntoh(struct GNUNET_TIME_AbsoluteNBO a)
Convert absolute time from network byte order.
Definition: time.c:673
static void shutdown_task(void *cls)
Task run during shutdown.
int GNUNET_CONFIGURATION_get_value_number(const struct GNUNET_CONFIGURATION_Handle *cfg, const char *section, const char *option, unsigned long long *number)
Get a configuration value that should be a number.
uint64_t rel_value_us
The actual value.
static struct GNUNET_TIME_Relative get_transmit_delay(int round_offset)
Get the transmission delay that should be applied for a particular round.
static char * pkey
Public key of the zone to look in, in ASCII.
static int update_flood_times(void *cls, const struct GNUNET_PeerIdentity *key, void *value)
Update transmissions for the given peer for the current round based on updated proximity information...
const struct GNUNET_PeerIdentity * id
What is the identity of the peer?
static struct GNUNET_TIME_Relative proof_find_delay
Interval between proof find runs.
Context for the core service connection.
Definition: core_api.c:77
uint32_t purpose
What does this signature vouch for? This must contain a GNUNET_SIGNATURE_PURPOSE_XXX constant (from g...
static void handle_core_disconnect(void *cls, const struct GNUNET_PeerIdentity *peer, void *internal_cls)
Method called whenever a peer disconnects.
Handle to a service.
Definition: service.c:116
int GNUNET_snprintf(char *buf, size_t size, const char *format,...)
Like snprintf, just aborts if the buffer is of insufficient size.
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_delayed_with_priority(struct GNUNET_TIME_Relative delay, enum GNUNET_SCHEDULER_Priority priority, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run with a specified delay.
Definition: scheduler.c:1183
struct GNUNET_MQ_Handle * GNUNET_SERVICE_client_get_mq(struct GNUNET_SERVICE_Client *c)
Obtain the message queue of c.
Definition: service.c:2437
struct GNUNET_TIME_AbsoluteNBO timestamp
Timestamp at which the server received the message.
Definition: nse.h:57
uint64_t GNUNET_CRYPTO_random_u64(enum GNUNET_CRYPTO_Quality mode, uint64_t max)
Random on unsigned 64-bit values.
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_shutdown(GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run on shutdown, that is when a CTRL-C signal is received, or when GNUNET_SCHEDULER_shutdown() is being invoked.
Definition: scheduler.c:1300
struct GNUNET_STATISTICS_Handle * GNUNET_STATISTICS_create(const char *subsystem, const struct GNUNET_CONFIGURATION_Handle *cfg)
Get handle for the statistics service.
static int start
Set if we are to start default services (including ARM).
Definition: gnunet-arm.c:39
static struct GNUNET_CONTAINER_MultiPeerMap * peers
Map of all connected peers.
unsigned int GNUNET_CRYPTO_hash_matching_bits(const struct GNUNET_HashCode *first, const struct GNUNET_HashCode *second)
Determine how many low order bits match in two struct GNUNET_HashCodes.
Definition: crypto_hash.c:272
static struct GNUNET_SCHEDULER_Task * proof_task
Task scheduled to compute our proof.
uint32_t GNUNET_CRYPTO_random_u32(enum GNUNET_CRYPTO_Quality mode, uint32_t i)
Produce a random value.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
#define GNUNET_MESSAGE_TYPE_NSE_P2P_FLOOD
P2P message sent from nearest peer.
int GNUNET_BIO_write_int64(struct GNUNET_BIO_WriteHandle *h, int64_t i)
Write an (u)int64_t.
Definition: bio.c:599
#define GNUNET_TIME_UNIT_SECONDS
One second.
struct GNUNET_TESTBED_LOGGER_Handle * GNUNET_TESTBED_LOGGER_connect(const struct GNUNET_CONFIGURATION_Handle *cfg)
Connect to the testbed logger service.
static struct GNUNET_SCHEDULER_Task * flood_task
Task scheduled to update our flood message for the next round.
struct GNUNET_MessageHeader header
Type: GNUNET_MESSAGE_TYPE_NSE_ESTIMATE.
Definition: nse.h:47
uint32_t matching_bits
Number of matching bits between the hash of timestamp and the initiator&#39;s public key.
static struct GNUNET_NSE_FloodMessage next_message
Message for the next round, if we got any.
int GNUNET_CRYPTO_eddsa_sign(const struct GNUNET_CRYPTO_EddsaPrivateKey *priv, const struct GNUNET_CRYPTO_EccSignaturePurpose *purpose, struct GNUNET_CRYPTO_EddsaSignature *sig)
EdDSA sign a given block.
Definition: crypto_ecc.c:987
Network size estimate sent from the service to clients.
Definition: nse.h:42
#define GNUNET_memcpy(dst, src, n)
Call memcpy() but check for n being 0 first.
#define GNUNET_MQ_hd_fixed_size(name, code, str, ctx)
static int ret
Return value of the commandline.
Definition: gnunet-abd.c:81
static int schedule_current_round(void *cls, const struct GNUNET_PeerIdentity *key, void *value)
Schedule transmission for the given peer for the current round based on what we know about the desire...
int GNUNET_CONTAINER_multipeermap_remove(struct GNUNET_CONTAINER_MultiPeerMap *map, const struct GNUNET_PeerIdentity *key, const void *value)
Remove the given key-value pair from the map.
#define GNUNET_NO
Definition: gnunet_common.h:78
#define HISTORY_SIZE
Over how many values do we calculate the weighted average?
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:75
struct GNUNET_TIME_Absolute GNUNET_TIME_absolute_add(struct GNUNET_TIME_Absolute start, struct GNUNET_TIME_Relative duration)
Add a given relative duration to the given start time.
Definition: time.c:395
#define GNUNET_new(type)
Allocate a struct or union of the given type.
void GNUNET_log_config_invalid(enum GNUNET_ErrorType kind, const char *section, const char *option, const char *required)
Log error message about invalid configuration option value.
static struct GNUNET_SCHEDULER_Task * t
Main task.
uint16_t size
The length of the struct (in bytes, including the length field itself), in big-endian format...
static struct GNUNET_PeerIdentity my_identity
The peer identity of this peer.
#define GNUNET_MESSAGE_TYPE_NSE_ESTIMATE
service->client message indicating
void GNUNET_STATISTICS_destroy(struct GNUNET_STATISTICS_Handle *h, int sync_first)
Destroy a handle (free all state associated with it).
void GNUNET_STATISTICS_update(struct GNUNET_STATISTICS_Handle *handle, const char *name, int64_t delta, int make_persistent)
Set statistic value for the peer.
struct GNUNET_CONTAINER_MultiPeerMap * GNUNET_CONTAINER_multipeermap_create(unsigned int len, int do_not_copy_keys)
Create a multi peer map (hash map for public keys of peers).
void GNUNET_SCHEDULER_shutdown(void)
Request the shutdown of a scheduler.
Definition: scheduler.c:526
static struct GNUNET_TIME_Relative gnunet_nse_interval
Interval for sending network size estimation flood requests.
Handle for the service.
static void run(void *cls, const struct GNUNET_CONFIGURATION_Handle *c, struct GNUNET_SERVICE_Handle *service)
Handle network size estimate clients.
static unsigned long long nse_work_required
Amount of work required (W-bit collisions) for NSE proofs, in collision-bits.
Time for absolute time used by GNUnet, in microseconds and in network byte order. ...
void GNUNET_notification_context_add(struct GNUNET_NotificationContext *nc, struct GNUNET_MQ_Handle *mq)
Add a subscriber to the notification context.
Definition: nc.c:160
uint64_t abs_value_us
The actual value.
ssize_t GNUNET_DISK_fn_write(const char *fn, const void *buffer, size_t n, enum GNUNET_DISK_AccessPermissions mode)
Write a buffer to a file.
Definition: disk.c:880
static void * client_connect_cb(void *cls, struct GNUNET_SERVICE_Client *c, struct GNUNET_MQ_Handle *mq)
Callback called when a client connects to the service.
#define GNUNET_break(cond)
Use this for internal assertion violations that are not fatal (can be handled) but should not occur...
#define GNUNET_NETWORK_STRUCT_BEGIN
Define as empty, GNUNET_PACKED should suffice, but this won&#39;t work on W32.
static void transmit_task_cb(void *cls)
Task that triggers a NSE P2P transmission.
void GNUNET_CONTAINER_multipeermap_destroy(struct GNUNET_CONTAINER_MultiPeerMap *map)
Destroy a hash map.
GNUNET_SERVICE_MAIN("nse", GNUNET_SERVICE_OPTION_NONE, &run, &client_connect_cb, &client_disconnect_cb, NULL, GNUNET_MQ_hd_fixed_size(start, GNUNET_MESSAGE_TYPE_NSE_START, struct GNUNET_MessageHeader, NULL), GNUNET_MQ_handler_end())
Define "main" method using service macro.
#define _(String)
GNU gettext support macro.
Definition: platform.h:181
Handle to a client that is connected to a service.
Definition: service.c:250
static void client_disconnect_cb(void *cls, struct GNUNET_SERVICE_Client *c, void *internal_cls)
Callback called when a client disconnected from the service.
static void write_proof()
Write our current proof to disk.
header of what an ECC signature signs this must be followed by "size - 8" bytes of the actual signed ...
static struct GNUNET_TIME_Relative get_delay_randomization(uint32_t matching_bits)
What delay randomization should we apply for a given number of matching bits?
int GNUNET_asprintf(char **buf, const char *format,...)
Like asprintf, just portable.
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_delayed(struct GNUNET_TIME_Relative delay, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run with a specified delay.
Definition: scheduler.c:1253
uint16_t type
The type of the message (GNUNET_MESSAGE_TYPE_XXXX), in big-endian format.
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_with_priority(enum GNUNET_SCHEDULER_Priority prio, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run with a specified priority.
Definition: scheduler.c:1207
static uint32_t hop_count_max
Current hop counter estimate (estimate for network diameter).
int GNUNET_CRYPTO_eddsa_verify(uint32_t purpose, const struct GNUNET_CRYPTO_EccSignaturePurpose *validate, const struct GNUNET_CRYPTO_EddsaSignature *sig, const struct GNUNET_CRYPTO_EddsaPublicKey *pub)
Verify EdDSA signature.
Definition: crypto_ecc.c:1114
struct GNUNET_CRYPTO_EddsaSignature signature
Signature (over range specified in purpose).
void GNUNET_log_config_missing(enum GNUNET_ErrorType kind, const char *section, const char *option)
Log error message about missing configuration option.
static char * value
Value of the record to add/remove.
static uint64_t proof
Definition: gnunet-scrypt.c:41
Network size estimate reply; sent when "this" peer&#39;s timer has run out before receiving a valid reply...
#define GNUNET_log_strerror_file(level, cmd, filename)
Log an error message at log-level &#39;level&#39; that indicates a failure of the command &#39;cmd&#39; with the mess...
#define GNUNET_break_op(cond)
Use this for assertion violations caused by other peers (i.e.
void GNUNET_CRYPTO_hash(const void *block, size_t size, struct GNUNET_HashCode *ret)
Compute hash of a given block.
Definition: crypto_hash.c:48
double std_deviation
The standard deviation (rounded down to the nearest integer) of size estimations. ...
Definition: nse.h:69
#define GNUNET_MAX(a, b)
Definition: gnunet_common.h:82
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_now(GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run as soon as possible.
Definition: scheduler.c:1280
static uint32_t get_matching_bits(struct GNUNET_TIME_Absolute timestamp, const struct GNUNET_PeerIdentity *id)
Get the number of matching bits that the given timestamp has to the given peer ID.
const char * GNUNET_STRINGS_relative_time_to_string(struct GNUNET_TIME_Relative delta, int do_round)
Give relative time in human-readable fancy format.
Definition: strings.c:687
static void find_proof(void *cls)
Find our proof of work.
static unsigned int estimate_index
Index of most recent estimate.
static double current_size_estimate
The current network size estimate.
uint16_t status
See PRISM_STATUS_*-constants.
static struct GNUNET_NotificationContext * nc
Notification context, simplifies client broadcasts.
static char buf[2048]
static int result
Global testing status.
#define GNUNET_TIME_UNIT_FOREVER_REL
Constant used to specify "forever".
static struct GNUNET_NSE_FloodMessage size_estimate_messages[64]
Array of recent size estimate messages.
Handle for buffered writing.
Definition: bio.c:379
uint32_t size
How many bytes does this signature sign? (including this purpose header); in network byte order (!)...
Internal representation of the hash map.
struct GNUNET_PeerIdentity origin
Public key of the originator.
void GNUNET_STATISTICS_set(struct GNUNET_STATISTICS_Handle *handle, const char *name, uint64_t value, int make_persistent)
Set statistic value for the peer.
A 512-bit hashcode.
struct GNUNET_CRYPTO_EccSignaturePurpose purpose
Purpose.
Message handler for a specific message type.
struct GNUNET_TIME_Absolute GNUNET_TIME_absolute_get(void)
Get the current time.
Definition: time.c:118
static void pow_hash(const void *buf, size_t buf_len, struct GNUNET_HashCode *result)
Calculate the &#39;proof-of-work&#39; hash (an expensive hash).
static double get_matching_bits_delay(uint32_t matching_bits)
How long should we delay a message to go the given number of matching bits?
#define NSE_PRIORITY
Message priority to use.
static struct GNUNET_REVOCATION_Query * q
Handle for revocation query.
Run when otherwise idle.
static struct GNUNET_IDENTITY_Handle * identity
Which namespace do we publish to? NULL if we do not publish to a namespace.
static struct GNUNET_STATISTICS_Handle * stats
Handle to the statistics service.
There must only be one value per key; storing a value should fail if a value under the same key alrea...
static void handle_p2p_estimate(void *cls, const struct GNUNET_NSE_FloodMessage *incoming_flood)
Core handler for size estimate flooding messages.
struct GNUNET_TESTBED_Peer * peer
The peer associated with this model.
struct GNUNET_HashCode key
The key used in the DHT.
static unsigned int size
Size of the "table".
Definition: peer.c:67
uint64_t proof_of_work
Proof of work, causing leading zeros when hashed with pkey.
int GNUNET_CRYPTO_hash_get_bit(const struct GNUNET_HashCode *code, unsigned int bit)
Obtain a bit from a hashcode.
Definition: crypto_hash.c:251
struct GNUNET_CORE_Handle * GNUNET_CORE_connect(const struct GNUNET_CONFIGURATION_Handle *cfg, void *cls, GNUNET_CORE_StartupCallback init, GNUNET_CORE_ConnectEventHandler connects, GNUNET_CORE_DisconnectEventHandler disconnects, const struct GNUNET_MQ_MessageHandler *handlers)
Connect to the core service.
Definition: core_api.c:692
void GNUNET_CORE_disconnect(struct GNUNET_CORE_Handle *handle)
Disconnect from the core service.
Definition: core_api.c:730
struct GNUNET_MQ_Envelope * env
Definition: 005.c:1
static double current_std_dev
The standard deviation of the last HISTORY_SIZE network size estimates.
static void setup_estimate_message(struct GNUNET_NSE_ClientMessage *em)
Initialize a message to clients with the current network size estimate.
static unsigned int count_leading_zeroes(const struct GNUNET_HashCode *hash)
Count the leading zeroes in hash.
struct GNUNET_SCHEDULER_Task * transmit_task
Task scheduled to send message to this peer.
static void update_network_size_estimate()
We&#39;ve sent on our flood message or one that we received which was validated and closer than ours...
double size_estimate
The current estimated network size.
Definition: nse.h:62
#define ROUND_SIZE
int GNUNET_BIO_write_close(struct GNUNET_BIO_WriteHandle *h)
Close an open file for writing.
Definition: bio.c:438
#define GNUNET_TIME_UNIT_ZERO
Relative time zero.
#define GNUNET_memcmp(a, b)
Compare memory in a and b, where both must be of the same pointer type.
an ECC signature using EdDSA.
void GNUNET_CRYPTO_eddsa_key_get_public(const struct GNUNET_CRYPTO_EddsaPrivateKey *priv, struct GNUNET_CRYPTO_EddsaPublicKey *pub)
Extract the public key for the given private key.
Definition: crypto_ecc.c:270
static struct GNUNET_CORE_Handle * core_api
Handle to the core service.
struct GNUNET_MessageHeader header
Type: GNUNET_MESSAGE_TYPE_NSE_P2P_FLOOD.
struct GNUNET_NotificationContext * GNUNET_notification_context_create(unsigned int queue_length)
Create a new notification context.
Definition: nc.c:121
static void * handle_core_connect(void *cls, const struct GNUNET_PeerIdentity *peer, struct GNUNET_MQ_Handle *mq)
Method called whenever a peer connects.
Handle to a message queue.
Definition: mq.c:85
struct GNUNET_TIME_AbsoluteNBO timestamp
The current timestamp value (which all peers should agree on).
int GNUNET_CONTAINER_multipeermap_put(struct GNUNET_CONTAINER_MultiPeerMap *map, const struct GNUNET_PeerIdentity *key, void *value, enum GNUNET_CONTAINER_MultiHashMapOption opt)
Store a key-value pair in the map.
#define GNUNET_NETWORK_STRUCT_END
Define as empty, GNUNET_PACKED should suffice, but this won&#39;t work on W32;.
Private ECC key encoded for transmission.
int GNUNET_CONTAINER_multipeermap_iterate(struct GNUNET_CONTAINER_MultiPeerMap *map, GNUNET_CONTAINER_PeerMapIterator it, void *it_cls)
Iterate over all entries in the map.
void GNUNET_MQ_set_options(struct GNUNET_MQ_Handle *mq, enum GNUNET_MQ_PriorityPreferences pp)
Set application-specific options for this queue.
Definition: mq.c:1066
void GNUNET_notification_context_broadcast(struct GNUNET_NotificationContext *nc, const struct GNUNET_MessageHeader *msg, int can_drop)
Send a message to all subscribers of this context.
Definition: nc.c:189
enum RadiotapType __attribute__
The identity of the host (wraps the signing key of the peer).
Connection handle for the logger service.
static struct GNUNET_CRYPTO_EddsaPrivateKey * my_private_key
The private key of this peer.
struct GNUNET_MQ_Handle * mq
Core handle for sending messages to this peer.
#define GNUNET_PACKED
gcc-ism to get packed structs.
static unsigned int estimate_count
Number of valid entries in the history.
configuration data
Definition: configuration.c:85
struct GNUNET_BIO_WriteHandle * GNUNET_BIO_write_open(const char *fn)
Open a file for writing.
Definition: bio.c:410
static struct GNUNET_TIME_Absolute next_timestamp
The next major time.
static int check_proof_of_work(const struct GNUNET_CRYPTO_EddsaPublicKey *pkey, uint64_t val)
Check whether the given public key and integer are a valid proof of work.
static uint64_t my_proof
Proof of work for this peer.
static struct GNUNET_TIME_Absolute current_timestamp
The current major time.
#define GNUNET_log(kind,...)
Entry in list of pending tasks.
Definition: scheduler.c:134
uint32_t hop_count
Number of hops this message has taken so far.
#define GNUNET_SIGNATURE_PURPOSE_NSE_SEND
Signature of a network size estimate message.
Common type definitions for the network size estimation service and API.
int GNUNET_CONFIGURATION_get_value_filename(const struct GNUNET_CONFIGURATION_Handle *cfg, const char *section, const char *option, char **value)
Get a configuration value that should be the name of a file or directory.
void GNUNET_TESTBED_LOGGER_write(struct GNUNET_TESTBED_LOGGER_Handle *h, const void *data, size_t size)
Send data to be logged to the logger service.
static void handle_start(void *cls, const struct GNUNET_MessageHeader *message)
Handler for START message from client, triggers an immediate current network estimate notification...
struct GNUNET_CRYPTO_EddsaPrivateKey * GNUNET_CRYPTO_eddsa_key_create_from_configuration(const struct GNUNET_CONFIGURATION_Handle *cfg)
Create a new private key by reading our peer&#39;s key from the file specified in the configuration...
struct GNUNET_TIME_Relative GNUNET_TIME_absolute_get_remaining(struct GNUNET_TIME_Absolute future)
Given a timestamp in the future, how much time remains until then?
Definition: time.c:331
Header for all communications.
Time for absolute times used by GNUnet, in microseconds.
static void core_init(void *cls, const struct GNUNET_PeerIdentity *identity)
Called on core init/fail.
#define GNUNET_YES
Definition: gnunet_common.h:77
void GNUNET_notification_context_destroy(struct GNUNET_NotificationContext *nc)
Destroy the context, force disconnect for all subscribers.
Definition: nc.c:137
void GNUNET_MQ_send(struct GNUNET_MQ_Handle *mq, struct GNUNET_MQ_Envelope *ev)
Send a message with the given message queue.
Definition: mq.c:353
void GNUNET_TESTBED_LOGGER_flush(struct GNUNET_TESTBED_LOGGER_Handle *h, GNUNET_TESTBED_LOGGER_FlushCompletion cb, void *cb_cls)
Flush the buffered data to the logger service.
unsigned int GNUNET_CONTAINER_multipeermap_size(const struct GNUNET_CONTAINER_MultiPeerMap *map)
Get the number of key-value pairs in the map.
const char * GNUNET_STRINGS_absolute_time_to_string(struct GNUNET_TIME_Absolute t)
Like asctime, except for GNUnet time.
Definition: strings.c:742
static unsigned long long matching_bits
Number of matching bits required for revocation.
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_at(struct GNUNET_TIME_Absolute at, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run at the specified time.
Definition: scheduler.c:1230
struct GNUNET_TIME_AbsoluteNBO GNUNET_TIME_absolute_hton(struct GNUNET_TIME_Absolute a)
Convert absolute time to network byte order.
Definition: time.c:657
const char * GNUNET_i2s(const struct GNUNET_PeerIdentity *pid)
Convert a peer identity to a string (for printing debug messages).
void GNUNET_SERVICE_client_continue(struct GNUNET_SERVICE_Client *c)
Continue receiving further messages from the given client.
Definition: service.c:2243
void GNUNET_TESTBED_LOGGER_disconnect(struct GNUNET_TESTBED_LOGGER_Handle *h)
Disconnect from the logger service.
static int verify_message_crypto(const struct GNUNET_NSE_FloodMessage *incoming_flood)
An incoming flood message has been received which claims to have more bits matching than any we know ...
#define GNUNET_MQ_handler_end()
End-marker for the handlers array.
static void update_flood_message(void *cls)
Update our flood message to be sent (and our timestamps).
No good quality of the operation is needed (i.e., random numbers can be pseudo-random).
double GNUNET_hton_double(double d)
Convert double to network byte order.
Definition: common_endian.c:66
static void setup_flood_message(unsigned int slot, struct GNUNET_TIME_Absolute ts)
Setup a flood message in our history array at the given slot offset for the given timestamp...
ssize_t GNUNET_DISK_fn_read(const char *fn, void *result, size_t len)
Read the contents of a binary file into a buffer.
Definition: disk.c:794
uint64_t GNUNET_ntohll(uint64_t n)
Convert unsigned 64-bit integer to host byte order.
Definition: common_endian.c:48
uint32_t reserved
For alignment.
Definition: nse.h:52
#define GNUNET_free(ptr)
Wrapper around free.
Time for relative time used by GNUnet, in microseconds.
static GNUNET_NETWORK_STRUCT_END const struct GNUNET_CONFIGURATION_Handle * cfg
Handle to our current configuration.
Per-peer information.
struct GNUNET_CRYPTO_EddsaPublicKey public_key
void * GNUNET_SCHEDULER_cancel(struct GNUNET_SCHEDULER_Task *task)
Cancel the task with the specified identifier.
Definition: scheduler.c:966
Public ECC key (always for curve Ed25519) encoded in a format suitable for network transmission and E...