GNUnet  0.11.x
gnunet-communicator-udp.c
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1 /*
2  This file is part of GNUnet
3  Copyright (C) 2010-2014, 2018, 2019 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 
40 #include "platform.h"
41 #include "gnunet_util_lib.h"
42 #include "gnunet_protocols.h"
43 #include "gnunet_signatures.h"
44 #include "gnunet_constants.h"
45 #include "gnunet_nt_lib.h"
46 #include "gnunet_nat_service.h"
50 
54 #define REKEY_TIME_INTERVAL GNUNET_TIME_UNIT_DAYS
55 
59 #define PROTO_QUEUE_TIMEOUT GNUNET_TIME_UNIT_MINUTES
60 
64 #define BROADCAST_FREQUENCY GNUNET_TIME_UNIT_MINUTES
65 
69 #define INTERFACE_SCAN_FREQUENCY \
70  GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 5)
71 
76 #define ADDRESS_VALIDITY_PERIOD GNUNET_TIME_UNIT_HOURS
77 
81 #define AES_KEY_SIZE (256 / 8)
82 
86 #define AES_IV_SIZE (96 / 8)
87 
91 #define GCM_TAG_SIZE (128 / 8)
92 
102 #define KCN_THRESHOLD 92
103 
110 #define KCN_TARGET 128
111 
121 #define MAX_SQN_DELTA 160
122 
132 #define MAX_SECRETS 128
133 
138 #define REKEY_MAX_BYTES (1024LLU * 1024 * 1024 * 4LLU)
139 
144 #define COMMUNICATOR_ADDRESS_PREFIX "udp"
145 
149 #define COMMUNICATOR_CONFIG_SECTION "communicator-udp"
150 
152 
153 
160 {
165 
170 
175 
180 
186 };
187 
188 
193 struct InitialKX
194 {
199 
204  char gcm_tag[GCM_TAG_SIZE];
205 };
206 
207 
213 {
218 
222  struct GNUNET_CRYPTO_EddsaSignature sender_sig;
223 
228  struct GNUNET_TIME_AbsoluteNBO monotonic_time;
229 
230  /* followed by messages */
231 
232  /* padding may follow actual messages */
233 };
234 
235 
240 struct UDPAck
241 {
245  struct GNUNET_MessageHeader header;
246 
251  uint32_t sequence_max GNUNET_PACKED;
252 
256  struct GNUNET_HashCode cmac;
257 };
258 
259 
269 {
274 
279 
283  struct GNUNET_HashCode h_address;
284 };
285 
286 
294 {
299 
304  struct GNUNET_CRYPTO_EddsaSignature sender_sig;
305 };
306 
307 
312 struct UDPBox
313 {
322 
330  char gcm_tag[GCM_TAG_SIZE];
331 };
332 
333 
335 
339 struct SharedSecret;
340 
341 
347 {
352 
357 
366 
370  struct SharedSecret *ss;
371 
375  uint32_t sequence_number;
376 };
377 
378 
383 struct SenderAddress;
384 
389 struct ReceiverAddress;
390 
395 {
400 
405 
410 
415 
420 
425 
429  struct GNUNET_HashCode master;
430 
434  struct GNUNET_HashCode cmac;
435 
440  uint32_t sequence_used;
441 
448 
452  unsigned int active_kce_count;
453 };
454 
455 
461 {
465  struct GNUNET_PeerIdentity target;
466 
471 
476 
481 
485  struct sockaddr *address;
486 
490  socklen_t address_len;
491 
496 
500  unsigned int num_secrets;
501 
506 };
507 
508 
514 {
518  struct GNUNET_PeerIdentity target;
519 
524 
529 
535 
539  struct sockaddr *address;
540 
544  socklen_t address_len;
545 
550 
555 
560 
565 
570 
575 
579  size_t kx_mtu;
580 
584  size_t d_mtu;
585 
589  unsigned int num_secrets;
590 
595  unsigned int acks_available;
596 
601 };
602 
603 
608 {
613 
618 
623 
627  struct sockaddr *sa;
628 
632  struct sockaddr *ba;
633 
637  struct UDPBroadcast bcm;
638 
643  struct ipv6_mreq mcreq;
644 
648  socklen_t salen;
649 
653  int found;
654 };
655 
656 
661 
666 
671 
676 
681 
686 
691 
696 
701 
706 
711 
716 
721 
725 static int have_v6_socket;
726 
731 
736 
740 static const struct GNUNET_CONFIGURATION_Handle *cfg;
741 
746 
751 
755 static struct GNUNET_NAT_Handle *nat;
756 
760 static uint16_t my_port;
761 
762 
768 static void
770 {
771  if (AF_INET6 == bi->sa->sa_family)
772  {
773  /* Leave the multicast group */
775  IPPROTO_IPV6,
776  IPV6_LEAVE_GROUP,
777  &bi->mcreq,
778  sizeof(bi->mcreq)))
779  {
781  }
782  }
783  GNUNET_CONTAINER_DLL_remove (bi_head, bi_tail, bi);
785  GNUNET_free (bi->sa);
786  GNUNET_free (bi->ba);
787  GNUNET_free (bi);
788 }
789 
790 
796 static void
798 {
799  struct GNUNET_MQ_Handle *mq;
800 
802  "Disconnecting receiver for peer `%s'\n",
803  GNUNET_i2s (&receiver->target));
804  if (NULL != (mq = receiver->kx_mq))
805  {
806  receiver->kx_mq = NULL;
807  GNUNET_MQ_destroy (mq);
808  }
809  if (NULL != receiver->kx_qh)
810  {
812  receiver->kx_qh = NULL;
813  }
814  if (NULL != (mq = receiver->d_mq))
815  {
816  receiver->d_mq = NULL;
817  GNUNET_MQ_destroy (mq);
818  }
819  if (NULL != receiver->d_qh)
820  {
822  receiver->d_qh = NULL;
823  }
826  &receiver->target,
827  receiver));
828  GNUNET_assert (receiver == GNUNET_CONTAINER_heap_remove_node (receiver->hn));
829  GNUNET_STATISTICS_set (stats,
830  "# receivers active",
832  GNUNET_NO);
833  GNUNET_free (receiver->address);
834  GNUNET_free (receiver->foreign_addr);
835  GNUNET_free (receiver);
836 }
837 
838 
844 static void
846 {
847  struct SharedSecret *ss = kce->ss;
848 
849  ss->active_kce_count--;
852  &kce->kid,
853  kce));
854  GNUNET_free (kce);
855 }
856 
857 
865 static void
866 get_kid (const struct GNUNET_HashCode *msec,
867  uint32_t serial,
868  struct GNUNET_ShortHashCode *kid)
869 {
870  uint32_t sid = htonl (serial);
871 
872  GNUNET_CRYPTO_hkdf (kid,
873  sizeof(*kid),
874  GCRY_MD_SHA512,
875  GCRY_MD_SHA256,
876  &sid,
877  sizeof(sid),
878  msec,
879  sizeof(*msec),
880  "UDP-KID",
881  strlen ("UDP-KID"),
882  NULL,
883  0);
884 }
885 
886 
893 static void
894 kce_generate (struct SharedSecret *ss, uint32_t seq)
895 {
896  struct KeyCacheEntry *kce;
897 
898  GNUNET_assert (0 < seq);
899  kce = GNUNET_new (struct KeyCacheEntry);
900  kce->ss = ss;
901  kce->sequence_number = seq;
902  get_kid (&ss->master, seq, &kce->kid);
904  ss->active_kce_count++;
906  key_cache,
907  &kce->kid,
908  kce,
910  GNUNET_STATISTICS_set (stats,
911  "# KIDs active",
913  GNUNET_NO);
914 }
915 
916 
922 static void
924 {
925  struct SenderAddress *sender;
926  struct ReceiverAddress *receiver;
927  struct KeyCacheEntry *kce;
928 
929  if (NULL != (sender = ss->sender))
930  {
931  GNUNET_CONTAINER_DLL_remove (sender->ss_head, sender->ss_tail, ss);
932  sender->num_secrets--;
933  }
934  if (NULL != (receiver = ss->receiver))
935  {
936  GNUNET_CONTAINER_DLL_remove (receiver->ss_head, receiver->ss_tail, ss);
937  receiver->num_secrets--;
938  receiver->acks_available -= (ss->sequence_allowed - ss->sequence_used);
939  }
940  while (NULL != (kce = ss->kce_head))
941  kce_destroy (kce);
942  GNUNET_STATISTICS_update (stats, "# Secrets active", -1, GNUNET_NO);
943  GNUNET_STATISTICS_set (stats,
944  "# KIDs active",
946  GNUNET_NO);
947  GNUNET_free (ss);
948 }
949 
950 
957 static void
959 {
960  GNUNET_assert (
961  GNUNET_YES ==
962  GNUNET_CONTAINER_multipeermap_remove (senders, &sender->target, sender));
963  GNUNET_assert (sender == GNUNET_CONTAINER_heap_remove_node (sender->hn));
964  GNUNET_STATISTICS_set (stats,
965  "# senders active",
967  GNUNET_NO);
968  GNUNET_free (sender->address);
969  GNUNET_free (sender);
970 }
971 
972 
981 static void
982 get_iv_key (const struct GNUNET_HashCode *msec,
983  uint32_t serial,
984  char key[AES_KEY_SIZE],
985  char iv[AES_IV_SIZE])
986 {
987  uint32_t sid = htonl (serial);
988  char res[AES_KEY_SIZE + AES_IV_SIZE];
989 
990  GNUNET_CRYPTO_hkdf (res,
991  sizeof(res),
992  GCRY_MD_SHA512,
993  GCRY_MD_SHA256,
994  &sid,
995  sizeof(sid),
996  msec,
997  sizeof(*msec),
998  "UDP-IV-KEY",
999  strlen ("UDP-IV-KEY"),
1000  NULL,
1001  0);
1002  memcpy (key, res, AES_KEY_SIZE);
1003  memcpy (iv, &res[AES_KEY_SIZE], AES_IV_SIZE);
1004 }
1005 
1006 
1012 static void
1014 {
1015  sender->timeout =
1018 }
1019 
1020 
1026 static void
1028 {
1029  receiver->timeout =
1032  receiver->timeout.abs_value_us);
1033 }
1034 
1035 
1041 static void
1042 check_timeouts (void *cls)
1043 {
1044  struct GNUNET_TIME_Relative st;
1045  struct GNUNET_TIME_Relative rt;
1046  struct GNUNET_TIME_Relative delay;
1047  struct ReceiverAddress *receiver;
1048  struct SenderAddress *sender;
1049 
1050  (void) cls;
1051  timeout_task = NULL;
1053  while (NULL != (receiver = GNUNET_CONTAINER_heap_peek (receivers_heap)))
1054  {
1056  if (0 != rt.rel_value_us)
1057  break;
1059  "Receiver timed out\n");
1060  receiver_destroy (receiver);
1061  }
1063  while (NULL != (sender = GNUNET_CONTAINER_heap_peek (senders_heap)))
1064  {
1066  if (0 != st.rel_value_us)
1067  break;
1068  sender_destroy (sender);
1069  }
1070  delay = GNUNET_TIME_relative_min (rt, st);
1071  if (delay.rel_value_us < GNUNET_TIME_UNIT_FOREVER_REL.rel_value_us)
1072  timeout_task = GNUNET_SCHEDULER_add_delayed (delay, &check_timeouts, NULL);
1073 }
1074 
1075 
1081 static void
1083 {
1084  GNUNET_CRYPTO_hkdf (&ss->cmac,
1085  sizeof(ss->cmac),
1086  GCRY_MD_SHA512,
1087  GCRY_MD_SHA256,
1088  "CMAC",
1089  strlen ("CMAC"),
1090  &ss->master,
1091  sizeof(ss->master),
1092  "UDP-CMAC",
1093  strlen ("UDP-CMAC"),
1094  NULL,
1095  0);
1096 }
1097 
1098 
1107 static void
1109  const void *plaintext,
1110  size_t plaintext_len)
1111 {
1112  const struct GNUNET_MessageHeader *hdr = plaintext;
1113  const char *pos = plaintext;
1114 
1115  while (ntohs (hdr->size) < plaintext_len)
1116  {
1117  GNUNET_STATISTICS_update (stats,
1118  "# bytes given to core",
1119  ntohs (hdr->size),
1120  GNUNET_NO);
1122  "Giving %u bytes to TNG\n", ntohs (hdr->size));
1125  &sender->target,
1126  hdr,
1128  NULL /* no flow control possible */
1129  ,
1130  NULL));
1131  /* move on to next message, if any */
1132  plaintext_len -= ntohs (hdr->size);
1133  if (plaintext_len < sizeof(*hdr))
1134  break;
1135  pos += ntohs (hdr->size);
1136  hdr = (const struct GNUNET_MessageHeader *) pos;
1137  // TODO for now..., we do not actually sen >1msg or have a way of telling
1138  // if we are done
1139  break;
1140  }
1141  GNUNET_STATISTICS_update (stats,
1142  "# bytes padding discarded",
1143  plaintext_len,
1144  GNUNET_NO);
1145 }
1146 
1147 
1156 static void
1157 setup_cipher (const struct GNUNET_HashCode *msec,
1158  uint32_t serial,
1159  gcry_cipher_hd_t *cipher)
1160 {
1161  char key[AES_KEY_SIZE];
1162  char iv[AES_IV_SIZE];
1163  int rc;
1164 
1165  GNUNET_assert (0 ==
1166  gcry_cipher_open (cipher,
1167  GCRY_CIPHER_AES256 /* low level: go for speed */,
1168  GCRY_CIPHER_MODE_GCM,
1169  0 /* flags */));
1170  get_iv_key (msec, serial, key, iv);
1171  rc = gcry_cipher_setkey (*cipher, key, sizeof(key));
1172  GNUNET_assert ((0 == rc) || ((char) rc == GPG_ERR_WEAK_KEY));
1173  rc = gcry_cipher_setiv (*cipher, iv, sizeof(iv));
1174  GNUNET_assert ((0 == rc) || ((char) rc == GPG_ERR_WEAK_KEY));
1175 }
1176 
1177 
1190 static int
1191 try_decrypt (const struct SharedSecret *ss,
1192  const char tag[GCM_TAG_SIZE],
1193  uint32_t serial,
1194  const char *in_buf,
1195  size_t in_buf_size,
1196  char *out_buf)
1197 {
1198  gcry_cipher_hd_t cipher;
1199 
1200  setup_cipher (&ss->master, serial, &cipher);
1201  GNUNET_assert (
1202  0 ==
1203  gcry_cipher_decrypt (cipher, out_buf, in_buf_size, in_buf, in_buf_size));
1204  if (0 != gcry_cipher_checktag (cipher, tag, GCM_TAG_SIZE))
1205  {
1206  gcry_cipher_close (cipher);
1207  GNUNET_STATISTICS_update (stats,
1208  "# AEAD authentication failures",
1209  1,
1210  GNUNET_NO);
1211  return GNUNET_SYSERR;
1212  }
1213  gcry_cipher_close (cipher);
1214  return GNUNET_OK;
1215 }
1216 
1217 
1224 static struct SharedSecret *
1226 {
1227  struct SharedSecret *ss;
1228 
1229  ss = GNUNET_new (struct SharedSecret);
1230  GNUNET_CRYPTO_eddsa_ecdh (my_private_key, ephemeral, &ss->master);
1231  return ss;
1232 }
1233 
1234 
1242 static struct SharedSecret *
1244  struct ReceiverAddress *receiver)
1245 {
1246  struct SharedSecret *ss;
1247 
1248  ss = GNUNET_new (struct SharedSecret);
1249  GNUNET_CRYPTO_ecdh_eddsa (ephemeral,
1250  &receiver->target.public_key,
1251  &ss->master);
1252  calculate_cmac (ss);
1253  ss->receiver = receiver;
1254  GNUNET_CONTAINER_DLL_insert (receiver->ss_head, receiver->ss_tail, ss);
1255  receiver->num_secrets++;
1256  GNUNET_STATISTICS_update (stats, "# Secrets active", 1, GNUNET_NO);
1257  return ss;
1258 }
1259 
1260 
1268 static void
1270 
1271 
1282 static int
1283 handle_ack (void *cls, const struct GNUNET_PeerIdentity *pid, void *value)
1284 {
1285  const struct UDPAck *ack = cls;
1286  struct ReceiverAddress *receiver = value;
1288  "in handle ack\n");
1289 
1290  (void) pid;
1291  for (struct SharedSecret *ss = receiver->ss_head; NULL != ss; ss = ss->next)
1292  {
1293  if (0 == memcmp (&ack->cmac, &ss->cmac, sizeof(struct GNUNET_HashCode)))
1294  {
1295  uint32_t allowed;
1297  "Found matching mac\n");
1298 
1299  allowed = ntohl (ack->sequence_max);
1300 
1301  if (allowed > ss->sequence_allowed)
1302  {
1304  "%u > %u (%u)\n", allowed, ss->sequence_allowed,
1305  receiver->acks_available);
1306 
1307  receiver->acks_available += (allowed - ss->sequence_allowed);
1309  "Tell transport we have more acks!\n");
1311  receiver->d_qh,
1312  (allowed - ss->sequence_allowed),
1313  1);
1314  ss->sequence_allowed = allowed;
1315  /* move ss to head to avoid discarding it anytime soon! */
1316  GNUNET_CONTAINER_DLL_remove (receiver->ss_head, receiver->ss_tail, ss);
1317  GNUNET_CONTAINER_DLL_insert (receiver->ss_head, receiver->ss_tail, ss);
1318  }
1319  return GNUNET_NO;
1320  }
1321  }
1322  return GNUNET_YES;
1323 }
1324 
1325 
1334 static void
1336  const void *buf,
1337  size_t buf_size)
1338 {
1339  const struct GNUNET_MessageHeader *hdr =
1340  (const struct GNUNET_MessageHeader *) buf;
1341  const struct UDPAck *ack = (const struct UDPAck *) buf;
1342  uint16_t type;
1343 
1344  if (sizeof(*hdr) > buf_size)
1345  return; /* not even a header */
1346  if (ntohs (hdr->size) > buf_size)
1347  return; /* not even a header */
1348  type = ntohs (hdr->type);
1349  switch (type)
1350  {
1352  /* lookup master secret by 'cmac', then update sequence_max */
1354  &sender->target,
1355  &handle_ack,
1356  (void *) ack);
1357  /* There could be more messages after the ACK, handle those as well */
1358  buf += ntohs (hdr->size);
1359  buf_size -= ntohs (hdr->size);
1360  pass_plaintext_to_core (sender, buf, buf_size);
1361  break;
1362 
1364  /* skip padding */
1365  break;
1366 
1367  default:
1368  pass_plaintext_to_core (sender, buf, buf_size);
1369  }
1370 }
1371 
1372 
1381 static void
1383 {
1384  GNUNET_assert (NULL != ss->sender);
1385  /* drop ancient KeyCacheEntries */
1386  while ((NULL != ss->kce_head) &&
1387  (MAX_SQN_DELTA <
1389  kce_destroy (ss->kce_tail);
1390  if (ss->active_kce_count < KCN_THRESHOLD)
1391  {
1392  struct UDPAck ack;
1393 
1394  while (ss->active_kce_count < KCN_TARGET)
1395  kce_generate (ss, ++ss->sequence_allowed);
1397  ack.header.size = htons (sizeof(ack));
1398  ack.sequence_max = htonl (ss->sequence_allowed);
1399  ack.cmac = ss->cmac;
1401  "Notifying transport of UDPAck %s\n",
1402  GNUNET_i2s_full (&ss->sender->target));
1404  &ss->sender->target,
1406  &ack.header);
1407  }
1408 }
1409 
1410 
1418 static void
1419 decrypt_box (const struct UDPBox *box,
1420  size_t box_len,
1421  struct KeyCacheEntry *kce)
1422 {
1423  struct SharedSecret *ss = kce->ss;
1424  char out_buf[box_len - sizeof(*box)];
1425 
1426  GNUNET_assert (NULL != ss->sender);
1427  if (GNUNET_OK != try_decrypt (ss,
1428  box->gcm_tag,
1429  kce->sequence_number,
1430  (const char *) &box[1],
1431  sizeof(out_buf),
1432  out_buf))
1433  {
1434  GNUNET_STATISTICS_update (stats,
1435  "# Decryption failures with valid KCE",
1436  1,
1437  GNUNET_NO);
1438  kce_destroy (kce);
1439  return;
1440  }
1441  kce_destroy (kce);
1442  GNUNET_STATISTICS_update (stats,
1443  "# bytes decrypted with BOX",
1444  sizeof(out_buf),
1445  GNUNET_NO);
1446  try_handle_plaintext (ss->sender, out_buf, sizeof(out_buf));
1447  consider_ss_ack (ss);
1448 }
1449 
1450 
1454 struct SearchContext
1455 {
1459  const struct sockaddr *address;
1460 
1464  socklen_t address_len;
1465 
1470 };
1471 
1472 
1481 static int
1483  const struct GNUNET_PeerIdentity *key,
1484  void *value)
1485 {
1486  struct SearchContext *sc = cls;
1487  struct SenderAddress *sender = value;
1488 
1489  if ((sender->address_len == sc->address_len) &&
1490  (0 == memcmp (sender->address, sc->address, sender->address_len)))
1491  {
1492  sc->sender = sender;
1493  return GNUNET_NO; /* stop iterating! */
1494  }
1495  return GNUNET_YES;
1496 }
1497 
1498 
1510 static struct SenderAddress *
1512  const struct sockaddr *address,
1513  socklen_t address_len)
1514 {
1515  struct SenderAddress *sender;
1516  struct SearchContext sc = { .address = address,
1517  .address_len = address_len,
1518  .sender = NULL };
1519 
1521  target,
1523  &sc);
1524  if (NULL != sc.sender)
1525  {
1527  return sc.sender;
1528  }
1529  sender = GNUNET_new (struct SenderAddress);
1530  sender->target = *target;
1531  sender->address = GNUNET_memdup (address, address_len);
1532  sender->address_len = address_len;
1534  senders,
1535  &sender->target,
1536  sender,
1538  GNUNET_STATISTICS_set (stats,
1539  "# senders active",
1541  GNUNET_NO);
1542  sender->timeout =
1544  sender->hn = GNUNET_CONTAINER_heap_insert (senders_heap,
1545  sender,
1546  sender->timeout.abs_value_us);
1547  sender->nt = GNUNET_NT_scanner_get_type (is, address, address_len);
1548  if (NULL == timeout_task)
1549  timeout_task = GNUNET_SCHEDULER_add_now (&check_timeouts, NULL);
1550  return sender;
1551 }
1552 
1553 
1561 static int
1563  const struct UDPConfirmation *uc)
1564 {
1565  struct UdpHandshakeSignature uhs;
1566 
1568  uhs.purpose.size = htonl (sizeof(uhs));
1569  uhs.sender = uc->sender;
1570  uhs.receiver = my_identity;
1571  uhs.ephemeral = *ephemeral;
1572  uhs.monotonic_time = uc->monotonic_time;
1575  &uhs,
1576  &uc->sender_sig,
1577  &uc->sender.public_key);
1578 }
1579 
1580 
1589 static char *
1590 sockaddr_to_udpaddr_string (const struct sockaddr *address,
1591  socklen_t address_len)
1592 {
1593  char *ret;
1594 
1595  switch (address->sa_family)
1596  {
1597  case AF_INET:
1598  GNUNET_asprintf (&ret,
1599  "%s-%s",
1601  GNUNET_a2s (address, address_len));
1602  break;
1603 
1604  case AF_INET6:
1605  GNUNET_asprintf (&ret,
1606  "%s-%s",
1608  GNUNET_a2s (address, address_len));
1609  break;
1610 
1611  default:
1612  GNUNET_assert (0);
1613  }
1614  return ret;
1615 }
1616 
1617 
1623 static void
1624 sock_read (void *cls)
1625 {
1626  struct sockaddr_storage sa;
1627  socklen_t salen = sizeof(sa);
1628  char buf[UINT16_MAX];
1629  ssize_t rcvd;
1630 
1631  (void) cls;
1633  udp_sock,
1634  &sock_read,
1635  NULL);
1636  rcvd = GNUNET_NETWORK_socket_recvfrom (udp_sock,
1637  buf,
1638  sizeof(buf),
1639  (struct sockaddr *) &sa,
1640  &salen);
1641  if (-1 == rcvd)
1642  {
1644  return;
1645  }
1647  "Read %lu bytes\n", rcvd);
1648  /* first, see if it is a UDPBox */
1649  if (rcvd > sizeof(struct UDPBox))
1650  {
1651  const struct UDPBox *box;
1652  struct KeyCacheEntry *kce;
1653 
1654  box = (const struct UDPBox *) buf;
1655  kce = GNUNET_CONTAINER_multishortmap_get (key_cache, &box->kid);
1656  if (NULL != kce)
1657  {
1658  decrypt_box (box, (size_t) rcvd, kce);
1659  return;
1660  }
1661  }
1662 
1663  /* next, check if it is a broadcast */
1664  if (sizeof(struct UDPBroadcast) == rcvd)
1665  {
1666  const struct UDPBroadcast *ub;
1667  struct UdpBroadcastSignature uhs;
1668 
1669  ub = (const struct UDPBroadcast *) buf;
1671  uhs.purpose.size = htonl (sizeof(uhs));
1672  uhs.sender = ub->sender;
1673  GNUNET_CRYPTO_hash (&sa, salen, &uhs.h_address);
1674  if (GNUNET_OK ==
1676  &uhs,
1677  &ub->sender_sig,
1678  &ub->sender.public_key))
1679  {
1680  char *addr_s;
1681  enum GNUNET_NetworkType nt;
1682 
1683  addr_s =
1684  sockaddr_to_udpaddr_string ((const struct sockaddr *) &sa, salen);
1685  GNUNET_STATISTICS_update (stats, "# broadcasts received", 1, GNUNET_NO);
1686  /* use our own mechanism to determine network type */
1687  nt =
1688  GNUNET_NT_scanner_get_type (is, (const struct sockaddr *) &sa, salen);
1689  GNUNET_TRANSPORT_application_validate (ah, &ub->sender, nt, addr_s);
1690  GNUNET_free (addr_s);
1691  return;
1692  }
1693  /* continue with KX, mostly for statistics... */
1694  }
1695 
1696 
1697  /* finally, test if it is a KX */
1698  if (rcvd < sizeof(struct UDPConfirmation) + sizeof(struct InitialKX))
1699  {
1700  GNUNET_STATISTICS_update (stats,
1701  "# messages dropped (no kid, too small for KX)",
1702  1,
1703  GNUNET_NO);
1704  return;
1705  }
1707  "Got KX\n");
1708  {
1709  const struct InitialKX *kx;
1710  struct SharedSecret *ss;
1711  char pbuf[rcvd - sizeof(struct InitialKX)];
1712  const struct UDPConfirmation *uc;
1713  struct SenderAddress *sender;
1714 
1715  kx = (const struct InitialKX *) buf;
1716  ss = setup_shared_secret_dec (&kx->ephemeral);
1717  if (GNUNET_OK != try_decrypt (ss,
1718  kx->gcm_tag,
1719  0,
1720  &buf[sizeof(*kx)],
1721  sizeof(pbuf),
1722  pbuf))
1723  {
1725  "Unable to decrypt tag, dropping...\n");
1726  GNUNET_free (ss);
1728  stats,
1729  "# messages dropped (no kid, AEAD decryption failed)",
1730  1,
1731  GNUNET_NO);
1732  return;
1733  }
1734  uc = (const struct UDPConfirmation *) pbuf;
1735  if (GNUNET_OK != verify_confirmation (&kx->ephemeral, uc))
1736  {
1737  GNUNET_break_op (0);
1738  GNUNET_free (ss);
1739  GNUNET_STATISTICS_update (stats,
1740  "# messages dropped (sender signature invalid)",
1741  1,
1742  GNUNET_NO);
1743  return;
1744  }
1745  calculate_cmac (ss);
1746  sender = setup_sender (&uc->sender, (const struct sockaddr *) &sa, salen);
1747  ss->sender = sender;
1748  GNUNET_CONTAINER_DLL_insert (sender->ss_head, sender->ss_tail, ss);
1749  sender->num_secrets++;
1750  GNUNET_STATISTICS_update (stats, "# Secrets active", 1, GNUNET_NO);
1751  GNUNET_STATISTICS_update (stats,
1752  "# messages decrypted without BOX",
1753  1,
1754  GNUNET_NO);
1755  try_handle_plaintext (sender, &uc[1], sizeof(pbuf) - sizeof(*uc));
1756  consider_ss_ack (ss);
1757  if (sender->num_secrets > MAX_SECRETS)
1758  secret_destroy (sender->ss_tail);
1759  }
1760 }
1761 
1762 
1770 static struct sockaddr *
1771 udp_address_to_sockaddr (const char *bindto, socklen_t *sock_len)
1772 {
1773  struct sockaddr *in;
1774  unsigned int port;
1775  char dummy[2];
1776  char *colon;
1777  char *cp;
1778 
1779  if (1 == sscanf (bindto, "%u%1s", &port, dummy))
1780  {
1781  /* interpreting value as just a PORT number */
1782  if (port > UINT16_MAX)
1783  {
1785  "BINDTO specification `%s' invalid: value too large for port\n",
1786  bindto);
1787  return NULL;
1788  }
1789  if ((GNUNET_NO == GNUNET_NETWORK_test_pf (PF_INET6)) ||
1790  (GNUNET_YES ==
1793  "DISABLE_V6")))
1794  {
1795  struct sockaddr_in *i4;
1796 
1797  i4 = GNUNET_malloc (sizeof(struct sockaddr_in));
1798  i4->sin_family = AF_INET;
1799  i4->sin_port = htons ((uint16_t) port);
1800  *sock_len = sizeof(struct sockaddr_in);
1801  in = (struct sockaddr *) i4;
1802  }
1803  else
1804  {
1805  struct sockaddr_in6 *i6;
1806 
1807  i6 = GNUNET_malloc (sizeof(struct sockaddr_in6));
1808  i6->sin6_family = AF_INET6;
1809  i6->sin6_port = htons ((uint16_t) port);
1810  *sock_len = sizeof(struct sockaddr_in6);
1811  in = (struct sockaddr *) i6;
1812  }
1813  return in;
1814  }
1815  cp = GNUNET_strdup (bindto);
1816  colon = strrchr (cp, ':');
1817  if (NULL != colon)
1818  {
1819  /* interpet value after colon as port */
1820  *colon = '\0';
1821  colon++;
1822  if (1 == sscanf (colon, "%u%1s", &port, dummy))
1823  {
1824  /* interpreting value as just a PORT number */
1825  if (port > UINT16_MAX)
1826  {
1828  "BINDTO specification `%s' invalid: value too large for port\n",
1829  bindto);
1830  GNUNET_free (cp);
1831  return NULL;
1832  }
1833  }
1834  else
1835  {
1836  GNUNET_log (
1838  "BINDTO specification `%s' invalid: last ':' not followed by number\n",
1839  bindto);
1840  GNUNET_free (cp);
1841  return NULL;
1842  }
1843  }
1844  else
1845  {
1846  /* interpret missing port as 0, aka pick any free one */
1847  port = 0;
1848  }
1849  {
1850  /* try IPv4 */
1851  struct sockaddr_in v4;
1852  if (1 == inet_pton (AF_INET, cp, &v4.sin_addr))
1853  {
1854  v4.sin_family = AF_INET;
1855  v4.sin_port = htons ((uint16_t) port);
1856 #if HAVE_SOCKADDR_IN_SIN_LEN
1857  v4.sin_len = sizeof(struct sockaddr_in);
1858 #endif
1859  in = GNUNET_memdup (&v4, sizeof(struct sockaddr_in));
1860  *sock_len = sizeof(struct sockaddr_in);
1861  GNUNET_free (cp);
1862  return in;
1863  }
1864  }
1865  {
1866  /* try IPv6 */
1867  struct sockaddr_in6 v6;
1868  const char *start;
1869 
1870  start = cp;
1871  if (('[' == *cp) && (']' == cp[strlen (cp) - 1]))
1872  {
1873  start++; /* skip over '[' */
1874  cp[strlen (cp) - 1] = '\0'; /* eat ']' */
1875  }
1876  if (1 == inet_pton (AF_INET6, start, &v6.sin6_addr))
1877  {
1878  v6.sin6_family = AF_INET6;
1879  v6.sin6_port = htons ((uint16_t) port);
1880 #if HAVE_SOCKADDR_IN_SIN_LEN
1881  v6.sin6_len = sizeof(sizeof(struct sockaddr_in6));
1882 #endif
1883  in = GNUNET_memdup (&v6, sizeof(v6));
1884  *sock_len = sizeof(v6);
1885  GNUNET_free (cp);
1886  return in;
1887  }
1888  }
1889  /* #5528 FIXME (feature!): maybe also try getnameinfo()? */
1890  GNUNET_free (cp);
1891  return NULL;
1892 }
1893 
1894 
1902 static void
1903 do_pad (gcry_cipher_hd_t out_cipher, char *dgram, size_t pad_size)
1904 {
1905  char pad[pad_size];
1906 
1908  if (sizeof(pad) > sizeof(struct GNUNET_MessageHeader))
1909  {
1910  struct GNUNET_MessageHeader hdr =
1911  { .size = htons (sizeof(pad)),
1912  .type = htons (GNUNET_MESSAGE_TYPE_COMMUNICATOR_UDP_PAD) };
1913 
1914  memcpy (pad, &hdr, sizeof(hdr));
1915  }
1916  GNUNET_assert (
1917  0 ==
1918  gcry_cipher_encrypt (out_cipher, dgram, sizeof(pad), pad, sizeof(pad)));
1919 }
1920 
1921 
1930 static void
1932  const struct GNUNET_MessageHeader *msg,
1933  void *impl_state)
1934 {
1935  struct ReceiverAddress *receiver = impl_state;
1936  uint16_t msize = ntohs (msg->size);
1937  struct UdpHandshakeSignature uhs;
1938  struct UDPConfirmation uc;
1939  struct InitialKX kx;
1940  struct GNUNET_CRYPTO_EcdhePrivateKey epriv;
1941  char dgram[receiver->kx_mtu + sizeof(uc) + sizeof(kx)];
1942  size_t dpos;
1943  gcry_cipher_hd_t out_cipher;
1944  struct SharedSecret *ss;
1945 
1946 
1947  GNUNET_assert (mq == receiver->kx_mq);
1948  if (msize > receiver->kx_mtu)
1949  {
1950  GNUNET_break (0);
1951  receiver_destroy (receiver);
1952  return;
1953  }
1954  reschedule_receiver_timeout (receiver);
1955 
1956  /* setup key material */
1958 
1959  ss = setup_shared_secret_enc (&epriv, receiver);
1960  setup_cipher (&ss->master, 0, &out_cipher);
1961  /* compute 'uc' */
1962  uc.sender = my_identity;
1963  uc.monotonic_time =
1966  uhs.purpose.size = htonl (sizeof(uhs));
1967  uhs.sender = my_identity;
1968  uhs.receiver = receiver->target;
1970  uhs.monotonic_time = uc.monotonic_time;
1971  GNUNET_CRYPTO_eddsa_sign (my_private_key,
1972  &uhs,
1973  &uc.sender_sig);
1974  /* Leave space for kx */
1975  dpos = sizeof(kx);
1976  /* Append encrypted uc to dgram */
1977  GNUNET_assert (0 == gcry_cipher_encrypt (out_cipher,
1978  &dgram[dpos],
1979  sizeof(uc),
1980  &uc,
1981  sizeof(uc)));
1982  dpos += sizeof(uc);
1983  /* Append encrypted payload to dgram */
1984  GNUNET_assert (
1985  0 == gcry_cipher_encrypt (out_cipher, &dgram[dpos], msize, msg, msize));
1986  dpos += msize;
1987  do_pad (out_cipher, &dgram[dpos], sizeof(dgram) - dpos);
1988  /* Datagram starts with kx */
1989  kx.ephemeral = uhs.ephemeral;
1990  GNUNET_assert (
1991  0 == gcry_cipher_gettag (out_cipher, kx.gcm_tag, sizeof(kx.gcm_tag)));
1992  gcry_cipher_close (out_cipher);
1993  memcpy (dgram, &kx, sizeof(kx));
1994  if (-1 == GNUNET_NETWORK_socket_sendto (udp_sock,
1995  dgram,
1996  sizeof(dgram),
1997  receiver->address,
1998  receiver->address_len))
2001  "Sending KX to %s\n", GNUNET_a2s (receiver->address,
2002  receiver->address_len));
2004 }
2005 
2006 
2015 static void
2017  const struct GNUNET_MessageHeader *msg,
2018  void *impl_state)
2019 {
2020  struct ReceiverAddress *receiver = impl_state;
2021  uint16_t msize = ntohs (msg->size);
2022 
2023  GNUNET_assert (mq == receiver->d_mq);
2024  if ((msize > receiver->d_mtu) ||
2025  (0 == receiver->acks_available))
2026  {
2027  GNUNET_break (0);
2028  receiver_destroy (receiver);
2029  return;
2030  }
2031  reschedule_receiver_timeout (receiver);
2032 
2033  /* begin "BOX" encryption method, scan for ACKs from tail! */
2034  for (struct SharedSecret *ss = receiver->ss_tail; NULL != ss; ss = ss->prev)
2035  {
2036  if (ss->sequence_used >= ss->sequence_allowed)
2037  {
2038  continue;
2039  }
2040  char dgram[sizeof(struct UDPBox) + receiver->d_mtu];
2041  struct UDPBox *box;
2042  gcry_cipher_hd_t out_cipher;
2043  size_t dpos;
2044 
2045  box = (struct UDPBox *) dgram;
2046  ss->sequence_used++;
2047  get_kid (&ss->master, ss->sequence_used, &box->kid);
2048  setup_cipher (&ss->master, ss->sequence_used, &out_cipher);
2049  /* Append encrypted payload to dgram */
2050  dpos = sizeof(struct UDPBox);
2051  GNUNET_assert (
2052  0 == gcry_cipher_encrypt (out_cipher, &dgram[dpos], msize, msg, msize));
2053  dpos += msize;
2054  do_pad (out_cipher, &dgram[dpos], sizeof(dgram) - dpos);
2055  GNUNET_assert (0 == gcry_cipher_gettag (out_cipher,
2056  box->gcm_tag,
2057  sizeof(box->gcm_tag)));
2058  gcry_cipher_close (out_cipher);
2059  if (-1 == GNUNET_NETWORK_socket_sendto (udp_sock,
2060  dgram,
2061  sizeof(dgram),
2062  receiver->address,
2063  receiver->address_len))
2066  receiver->acks_available--;
2067  if (0 == receiver->acks_available)
2068  {
2069  /* We have no more ACKs */
2071  "No more acks\n");
2072  }
2073  return;
2074  }
2075 }
2076 
2077 
2086 static void
2087 mq_destroy_d (struct GNUNET_MQ_Handle *mq, void *impl_state)
2088 {
2089  struct ReceiverAddress *receiver = impl_state;
2091  "Default MQ destroyed\n");
2092  if (mq == receiver->d_mq)
2093  {
2094  receiver->d_mq = NULL;
2095  receiver_destroy (receiver);
2096  }
2097 }
2098 
2099 
2108 static void
2109 mq_destroy_kx (struct GNUNET_MQ_Handle *mq, void *impl_state)
2110 {
2111  struct ReceiverAddress *receiver = impl_state;
2113  "KX MQ destroyed\n");
2114  if (mq == receiver->kx_mq)
2115  {
2116  receiver->kx_mq = NULL;
2117  receiver_destroy (receiver);
2118  }
2119 }
2120 
2121 
2128 static void
2129 mq_cancel (struct GNUNET_MQ_Handle *mq, void *impl_state)
2130 {
2131  /* Cancellation is impossible with UDP; bail */
2132  GNUNET_assert (0);
2133 }
2134 
2135 
2145 static void
2146 mq_error (void *cls, enum GNUNET_MQ_Error error)
2147 {
2148  struct ReceiverAddress *receiver = cls;
2149 
2151  "MQ error in queue to %s: %d\n",
2152  GNUNET_i2s (&receiver->target),
2153  (int) error);
2154  receiver_destroy (receiver);
2155 }
2156 
2157 
2165 static void
2167 {
2168  size_t base_mtu;
2169 
2170  /*if (NULL != receiver->kx_qh)
2171  {
2172  GNUNET_TRANSPORT_communicator_mq_del (receiver->kx_qh);
2173  receiver->kx_qh = NULL;
2174  }
2175  if (NULL != receiver->d_qh)
2176  {
2177  GNUNET_TRANSPORT_communicator_mq_del (receiver->d_qh);
2178  receiver->d_qh = NULL;
2179  }*/
2180  // GNUNET_assert (NULL == receiver->mq);
2181  switch (receiver->address->sa_family)
2182  {
2183  case AF_INET:
2184  base_mtu = 1480 /* Ethernet MTU, 1500 - Ethernet header - VLAN tag */
2185  - sizeof(struct GNUNET_TUN_IPv4Header) /* 20 */
2186  - sizeof(struct GNUNET_TUN_UdpHeader) /* 8 */;
2187  break;
2188 
2189  case AF_INET6:
2190  base_mtu = 1280 /* Minimum MTU required by IPv6 */
2191  - sizeof(struct GNUNET_TUN_IPv6Header) /* 40 */
2192  - sizeof(struct GNUNET_TUN_UdpHeader) /* 8 */;
2193  break;
2194 
2195  default:
2196  GNUNET_assert (0);
2197  break;
2198  }
2199  /* MTU based on full KX messages */
2200  receiver->kx_mtu = base_mtu - sizeof(struct InitialKX) /* 48 */
2201  - sizeof(struct UDPConfirmation); /* 104 */
2202  /* MTU based on BOXed messages */
2203  receiver->d_mtu = base_mtu - sizeof(struct UDPBox);
2204 
2206  "Setting up MQs and QHs\n");
2207  /* => Effective MTU for CORE will range from 1080 (IPv6 + KX) to
2208  1404 (IPv4 + Box) bytes, depending on circumstances... */
2209  if (NULL == receiver->kx_mq)
2211  &mq_destroy_kx,
2212  &mq_cancel,
2213  receiver,
2214  NULL,
2215  &mq_error,
2216  receiver);
2217  if (NULL == receiver->d_mq)
2219  &mq_destroy_d,
2220  &mq_cancel,
2221  receiver,
2222  NULL,
2223  &mq_error,
2224  receiver);
2225 
2226  receiver->kx_qh =
2228  &receiver->target,
2229  receiver->foreign_addr,
2230  receiver->kx_mtu,
2232  0, /* Priority */
2233  receiver->nt,
2235  receiver->kx_mq);
2236  receiver->d_qh =
2238  &receiver->target,
2239  receiver->foreign_addr,
2240  receiver->d_mtu,
2241  0, /* Initialize with 0 acks */
2242  1, /* Priority */
2243  receiver->nt,
2245  receiver->d_mq);
2246 
2247 }
2248 
2249 
2268 static int
2269 mq_init (void *cls, const struct GNUNET_PeerIdentity *peer, const char *address)
2270 {
2271  struct ReceiverAddress *receiver;
2272  const char *path;
2273  struct sockaddr *in;
2274  socklen_t in_len;
2275 
2276  if (0 != strncmp (address,
2278  strlen (COMMUNICATOR_ADDRESS_PREFIX "-")))
2279  {
2280  GNUNET_break_op (0);
2281  return GNUNET_SYSERR;
2282  }
2283  path = &address[strlen (COMMUNICATOR_ADDRESS_PREFIX "-")];
2284  in = udp_address_to_sockaddr (path, &in_len);
2285 
2286  receiver = GNUNET_new (struct ReceiverAddress);
2287  receiver->address = in;
2288  receiver->address_len = in_len;
2289  receiver->target = *peer;
2290  receiver->nt = GNUNET_NT_scanner_get_type (is, in, in_len);
2292  receivers,
2293  &receiver->target,
2294  receiver,
2297  "Added %s to receivers\n",
2298  GNUNET_i2s_full (&receiver->target));
2299  receiver->timeout =
2301  receiver->hn = GNUNET_CONTAINER_heap_insert (receivers_heap,
2302  receiver,
2303  receiver->timeout.abs_value_us);
2304  GNUNET_STATISTICS_set (stats,
2305  "# receivers active",
2307  GNUNET_NO);
2308  receiver->foreign_addr =
2309  sockaddr_to_udpaddr_string (receiver->address, receiver->address_len);
2310  setup_receiver_mq (receiver);
2311  if (NULL == timeout_task)
2312  timeout_task = GNUNET_SCHEDULER_add_now (&check_timeouts, NULL);
2313  return GNUNET_OK;
2314 }
2315 
2316 
2325 static int
2327  const struct GNUNET_PeerIdentity *target,
2328  void *value)
2329 {
2330  struct ReceiverAddress *receiver = value;
2331 
2332  (void) cls;
2333  (void) target;
2334  receiver_destroy (receiver);
2335  return GNUNET_OK;
2336 }
2337 
2338 
2347 static int
2349  const struct GNUNET_PeerIdentity *target,
2350  void *value)
2351 {
2352  struct SenderAddress *sender = value;
2353 
2354  (void) cls;
2355  (void) target;
2356  sender_destroy (sender);
2357  return GNUNET_OK;
2358 }
2359 
2360 
2366 static void
2367 do_shutdown (void *cls)
2368 {
2369  if (NULL != nat)
2370  {
2371  GNUNET_NAT_unregister (nat);
2372  nat = NULL;
2373  }
2374  while (NULL != bi_head)
2375  bi_destroy (bi_head);
2376  if (NULL != broadcast_task)
2377  {
2378  GNUNET_SCHEDULER_cancel (broadcast_task);
2379  broadcast_task = NULL;
2380  }
2381  if (NULL != read_task)
2382  {
2383  GNUNET_SCHEDULER_cancel (read_task);
2384  read_task = NULL;
2385  }
2386  if (NULL != udp_sock)
2387  {
2389  udp_sock = NULL;
2390  }
2393  NULL);
2398  GNUNET_CONTAINER_heap_destroy (senders_heap);
2399  GNUNET_CONTAINER_heap_destroy (receivers_heap);
2400  if (NULL != ch)
2401  {
2403  ch = NULL;
2404  }
2405  if (NULL != ah)
2406  {
2408  ah = NULL;
2409  }
2410  if (NULL != stats)
2411  {
2413  stats = NULL;
2414  }
2415  if (NULL != my_private_key)
2416  {
2417  GNUNET_free (my_private_key);
2418  my_private_key = NULL;
2419  }
2420  if (NULL != is)
2421  {
2423  is = NULL;
2424  }
2425 }
2426 
2427 
2437 static void
2438 enc_notify_cb (void *cls,
2439  const struct GNUNET_PeerIdentity *sender,
2440  const struct GNUNET_MessageHeader *msg)
2441 {
2442  const struct UDPAck *ack;
2443 
2444  (void) cls;
2446  "Storing UDPAck received from backchannel from %s\n",
2447  GNUNET_i2s_full (sender));
2448  if ((ntohs (msg->type) != GNUNET_MESSAGE_TYPE_COMMUNICATOR_UDP_ACK) ||
2449  (ntohs (msg->size) != sizeof(struct UDPAck)))
2450  {
2451  GNUNET_break_op (0);
2452  return;
2453  }
2454  ack = (const struct UDPAck *) msg;
2456  sender,
2457  &handle_ack,
2458  (void *) ack);
2459 }
2460 
2461 
2475 static void
2476 nat_address_cb (void *cls,
2477  void **app_ctx,
2478  int add_remove,
2480  const struct sockaddr *addr,
2481  socklen_t addrlen)
2482 {
2483  char *my_addr;
2485 
2486  if (GNUNET_YES == add_remove)
2487  {
2488  enum GNUNET_NetworkType nt;
2489 
2490  GNUNET_asprintf (&my_addr,
2491  "%s-%s",
2493  GNUNET_a2s (addr, addrlen));
2494  nt = GNUNET_NT_scanner_get_type (is, addr, addrlen);
2495  ai =
2497  my_addr,
2498  nt,
2500  GNUNET_free (my_addr);
2501  *app_ctx = ai;
2502  }
2503  else
2504  {
2505  ai = *app_ctx;
2507  *app_ctx = NULL;
2508  }
2509 }
2510 
2511 
2517 static void
2518 ifc_broadcast (void *cls)
2519 {
2520  struct BroadcastInterface *bi = cls;
2521  struct GNUNET_TIME_Relative delay;
2522 
2523  delay = BROADCAST_FREQUENCY;
2524  delay.rel_value_us =
2526  bi->broadcast_task =
2528 
2529  switch (bi->sa->sa_family)
2530  {
2531  case AF_INET: {
2532  static int yes = 1;
2533  static int no = 0;
2534  ssize_t sent;
2535 
2537  SOL_SOCKET,
2538  SO_BROADCAST,
2539  &yes,
2540  sizeof(int)))
2542  sent = GNUNET_NETWORK_socket_sendto (udp_sock,
2543  &bi->bcm,
2544  sizeof(bi->bcm),
2545  bi->ba,
2546  bi->salen);
2547  if (-1 == sent)
2550  SOL_SOCKET,
2551  SO_BROADCAST,
2552  &no,
2553  sizeof(int)))
2555  break;
2556  }
2557 
2558  case AF_INET6: {
2559  ssize_t sent;
2560  struct sockaddr_in6 dst;
2561 
2562  dst.sin6_family = AF_INET6;
2563  dst.sin6_port = htons (my_port);
2564  dst.sin6_addr = bi->mcreq.ipv6mr_multiaddr;
2565  dst.sin6_scope_id = ((struct sockaddr_in6 *) bi->ba)->sin6_scope_id;
2566 
2567  sent = GNUNET_NETWORK_socket_sendto (udp_sock,
2568  &bi->bcm,
2569  sizeof(bi->bcm),
2570  (const struct sockaddr *) &dst,
2571  sizeof(dst));
2572  if (-1 == sent)
2574  break;
2575  }
2576 
2577  default:
2578  GNUNET_break (0);
2579  break;
2580  }
2581 }
2582 
2583 
2598 static int
2599 iface_proc (void *cls,
2600  const char *name,
2601  int isDefault,
2602  const struct sockaddr *addr,
2603  const struct sockaddr *broadcast_addr,
2604  const struct sockaddr *netmask,
2605  socklen_t addrlen)
2606 {
2607  struct BroadcastInterface *bi;
2608  enum GNUNET_NetworkType network;
2609  struct UdpBroadcastSignature ubs;
2610 
2611  (void) cls;
2612  (void) netmask;
2613  if (NULL == addr)
2614  return GNUNET_YES; /* need to know our address! */
2615  network = GNUNET_NT_scanner_get_type (is, addr, addrlen);
2616  if (GNUNET_NT_LOOPBACK == network)
2617  {
2618  /* Broadcasting on loopback does not make sense */
2619  return GNUNET_YES;
2620  }
2621  for (bi = bi_head; NULL != bi; bi = bi->next)
2622  {
2623  if ((bi->salen == addrlen) && (0 == memcmp (addr, bi->sa, addrlen)))
2624  {
2625  bi->found = GNUNET_YES;
2626  return GNUNET_OK;
2627  }
2628  }
2629 
2630  if ((AF_INET6 == addr->sa_family) && (NULL == broadcast_addr))
2631  return GNUNET_OK; /* broadcast_addr is required for IPv6! */
2632  if ((AF_INET6 == addr->sa_family) && (GNUNET_YES != have_v6_socket))
2633  return GNUNET_OK; /* not using IPv6 */
2634 
2635  bi = GNUNET_new (struct BroadcastInterface);
2636  bi->sa = GNUNET_memdup (addr, addrlen);
2637  if (NULL != broadcast_addr)
2638  bi->ba = GNUNET_memdup (broadcast_addr, addrlen);
2639  bi->salen = addrlen;
2640  bi->found = GNUNET_YES;
2641  bi->bcm.sender = my_identity;
2643  ubs.purpose.size = htonl (sizeof(ubs));
2644  ubs.sender = my_identity;
2645  GNUNET_CRYPTO_hash (addr, addrlen, &ubs.h_address);
2646  GNUNET_CRYPTO_eddsa_sign (my_private_key,
2647  &ubs,
2648  &bi->bcm.sender_sig);
2649  if (NULL != broadcast_addr)
2650  {
2652  GNUNET_CONTAINER_DLL_insert (bi_head, bi_tail, bi);
2653  }
2654  if ((AF_INET6 == addr->sa_family) && (NULL != broadcast_addr))
2655  {
2656  /* Create IPv6 multicast request */
2657  const struct sockaddr_in6 *s6 =
2658  (const struct sockaddr_in6 *) broadcast_addr;
2659 
2660  GNUNET_assert (
2661  1 == inet_pton (AF_INET6, "FF05::13B", &bi->mcreq.ipv6mr_multiaddr));
2662 
2663  /* http://tools.ietf.org/html/rfc2553#section-5.2:
2664  *
2665  * IPV6_JOIN_GROUP
2666  *
2667  * Join a multicast group on a specified local interface. If the
2668  * interface index is specified as 0, the kernel chooses the local
2669  * interface. For example, some kernels look up the multicast
2670  * group in the normal IPv6 routing table and using the resulting
2671  * interface; we do this for each interface, so no need to use
2672  * zero (anymore...).
2673  */bi->mcreq.ipv6mr_interface = s6->sin6_scope_id;
2674 
2675  /* Join the multicast group */
2677  IPPROTO_IPV6,
2678  IPV6_JOIN_GROUP,
2679  &bi->mcreq,
2680  sizeof(bi->mcreq)))
2681  {
2683  }
2684  }
2685  return GNUNET_OK;
2686 }
2687 
2688 
2694 static void
2695 do_broadcast (void *cls)
2696 {
2697  struct BroadcastInterface *bin;
2698 
2699  (void) cls;
2700  for (struct BroadcastInterface *bi = bi_head; NULL != bi; bi = bi->next)
2701  bi->found = GNUNET_NO;
2703  for (struct BroadcastInterface *bi = bi_head; NULL != bi; bi = bin)
2704  {
2705  bin = bi->next;
2706  if (GNUNET_NO == bi->found)
2707  bi_destroy (bi);
2708  }
2710  &do_broadcast,
2711  NULL);
2712 }
2713 
2714 
2723 static void
2724 run (void *cls,
2725  char *const *args,
2726  const char *cfgfile,
2727  const struct GNUNET_CONFIGURATION_Handle *c)
2728 {
2729  char *bindto;
2730  struct sockaddr *in;
2731  socklen_t in_len;
2732  struct sockaddr_storage in_sto;
2733  socklen_t sto_len;
2734 
2735  (void) cls;
2736  cfg = c;
2737  if (GNUNET_OK !=
2740  "BINDTO",
2741  &bindto))
2742  {
2745  "BINDTO");
2746  return;
2747  }
2748 
2749  in = udp_address_to_sockaddr (bindto, &in_len);
2750  if (NULL == in)
2751  {
2753  "Failed to setup UDP socket address with path `%s'\n",
2754  bindto);
2755  GNUNET_free (bindto);
2756  return;
2757  }
2758  udp_sock =
2759  GNUNET_NETWORK_socket_create (in->sa_family, SOCK_DGRAM, IPPROTO_UDP);
2760  if (NULL == udp_sock)
2761  {
2763  GNUNET_free (in);
2764  GNUNET_free (bindto);
2765  return;
2766  }
2767  if (AF_INET6 == in->sa_family)
2769  if (GNUNET_OK != GNUNET_NETWORK_socket_bind (udp_sock, in, in_len))
2770  {
2772  GNUNET_NETWORK_socket_close (udp_sock);
2773  udp_sock = NULL;
2774  GNUNET_free (in);
2775  GNUNET_free (bindto);
2776  return;
2777  }
2778 
2779  /* We might have bound to port 0, allowing the OS to figure it out;
2780  thus, get the real IN-address from the socket */
2781  sto_len = sizeof(in_sto);
2782  if (0 != getsockname (GNUNET_NETWORK_get_fd (udp_sock),
2783  (struct sockaddr *) &in_sto,
2784  &sto_len))
2785  {
2786  memcpy (&in_sto, in, in_len);
2787  sto_len = in_len;
2788  }
2789  GNUNET_free (in);
2790  GNUNET_free (bindto);
2791  in = (struct sockaddr *) &in_sto;
2792  in_len = sto_len;
2794  "Bound to `%s'\n",
2795  GNUNET_a2s ((const struct sockaddr *) &in_sto, sto_len));
2796  switch (in->sa_family)
2797  {
2798  case AF_INET:
2799  my_port = ntohs (((struct sockaddr_in *) in)->sin_port);
2800  break;
2801 
2802  case AF_INET6:
2803  my_port = ntohs (((struct sockaddr_in6 *) in)->sin6_port);
2804  break;
2805 
2806  default:
2807  GNUNET_break (0);
2808  my_port = 0;
2809  }
2810  stats = GNUNET_STATISTICS_create ("C-UDP", cfg);
2814  receivers_heap =
2818  is = GNUNET_NT_scanner_init ();
2820  if (NULL == my_private_key)
2821  {
2822  GNUNET_log (
2824  _ (
2825  "Transport service is lacking key configuration settings. Exiting.\n"));
2827  return;
2828  }
2830  /* start reading */
2832  udp_sock,
2833  &sock_read,
2834  NULL);
2839  &mq_init,
2840  NULL,
2841  &enc_notify_cb,
2842  NULL);
2843  if (NULL == ch)
2844  {
2845  GNUNET_break (0);
2847  return;
2848  }
2850  if (NULL == ah)
2851  {
2852  GNUNET_break (0);
2854  return;
2855  }
2856  /* start broadcasting */
2857  if (GNUNET_YES !=
2860  "DISABLE_BROADCAST"))
2861  {
2862  broadcast_task = GNUNET_SCHEDULER_add_now (&do_broadcast, NULL);
2863  }
2864  nat = GNUNET_NAT_register (cfg,
2866  IPPROTO_UDP,
2867  1 /* one address */,
2868  (const struct sockaddr **) &in,
2869  &in_len,
2870  &nat_address_cb,
2871  NULL /* FIXME: support reversal: #5529 */,
2872  NULL /* closure */);
2873 }
2874 
2875 
2883 int
2884 main (int argc, char *const *argv)
2885 {
2886  static const struct GNUNET_GETOPT_CommandLineOption options[] = {
2888  };
2889  int ret;
2890 
2891  if (GNUNET_OK != GNUNET_STRINGS_get_utf8_args (argc, argv, &argc, &argv))
2892  return 2;
2893 
2894  ret = (GNUNET_OK == GNUNET_PROGRAM_run (argc,
2895  argv,
2896  "gnunet-communicator-udp",
2897  _ ("GNUnet UDP communicator"),
2898  options,
2899  &run,
2900  NULL))
2901  ? 0
2902  : 1;
2903  GNUNET_free_nz ((void *) argv);
2904  return ret;
2905 }
2906 
2907 
2908 /* end of gnunet-communicator-udp.c */
#define GNUNET_CONTAINER_DLL_remove(head, tail, element)
Remove an element from a DLL.
static void mq_send_d(struct GNUNET_MQ_Handle *mq, const struct GNUNET_MessageHeader *msg, void *impl_state)
Signature of functions implementing the sending functionality of a message queue. ...
struct KeyCacheEntry * next
Kept in a DLL.
Handle to the interface scanner.
Definition: nt.c:110
int GNUNET_NETWORK_socket_setsockopt(struct GNUNET_NETWORK_Handle *fd, int level, int option_name, const void *option_value, socklen_t option_len)
Set socket option.
Definition: network.c:883
#define GNUNET_MESSAGE_TYPE_COMMUNICATOR_UDP_PAD
UDP communicator padding.
int GNUNET_NETWORK_get_fd(const struct GNUNET_NETWORK_Handle *desc)
Return file descriptor for this network handle.
Definition: network.c:1080
#define COMMUNICATOR_CONFIG_SECTION
Configuration section used by the communicator.
enum GNUNET_NetworkType GNUNET_NT_scanner_get_type(struct GNUNET_NT_InterfaceScanner *is, const struct sockaddr *addr, socklen_t addrlen)
Returns where the address is located: loopback, LAN or WAN.
Definition: nt.c:314
static void mq_destroy_d(struct GNUNET_MQ_Handle *mq, void *impl_state)
Signature of functions implementing the destruction of a message queue.
void GNUNET_CONTAINER_heap_update_cost(struct GNUNET_CONTAINER_HeapNode *node, GNUNET_CONTAINER_HeapCostType new_cost)
Updates the cost of any node in the tree.
static struct BroadcastInterface * bi_tail
Broadcast interface tasks.
static void consider_ss_ack(struct SharedSecret *ss)
We established a shared secret with a sender.
struct SharedSecret * ss_tail
Shared secrets we used with target, last used is tail.
Handle for active NAT registrations.
Definition: nat_api.c:71
struct GNUNET_MessageHeader header
Type is GNUNET_MESSAGE_TYPE_COMMUNICATOR_UDP_ACK.
#define BROADCAST_FREQUENCY
How often do we broadcast our presence on the LAN?
struct GNUNET_PeerIdentity sender
Identity of the inititor of the UDP connection (UDP client).
int main(int argc, char *const *argv)
The main function for the UNIX communicator.
struct KeyCacheEntry * prev
Kept in a DLL.
int found
Was this interface found in the last iface_proc() scan?
static void do_broadcast(void *cls)
Scan interfaces to broadcast our presence on the LAN.
struct GNUNET_MessageHeader * msg
Definition: 005.c:2
static struct GNUNET_TRANSPORT_ApplicationHandle * ah
Our handle to report addresses for validation to TRANSPORT.
GNUNET_NAT_AddressClass
Some addresses contain sensitive information or are not suitable for global distribution.
uint64_t rel_value_us
The actual value.
#define GNUNET_CRYPTO_eddsa_sign(priv, ps, sig)
EdDSA sign a given block.
struct GNUNET_PeerIdentity sender
Sender&#39;s peer identity.
struct KeyCacheEntry * kce_head
Kept in a DLL, sorted by sequence number.
#define GNUNET_CONTAINER_DLL_insert(head, tail, element)
Insert an element at the head of a DLL.
static uint16_t my_port
Port number to which we are actually bound.
Broadcast by peer in LAN announcing its presence.
unsigned int GNUNET_CONTAINER_multishortmap_size(const struct GNUNET_CONTAINER_MultiShortmap *map)
Get the number of key-value pairs in the map.
static struct SenderAddress * setup_sender(const struct GNUNET_PeerIdentity *target, const struct sockaddr *address, socklen_t address_len)
Create sender address for target.
#define GNUNET_MESSAGE_TYPE_COMMUNICATOR_UDP_ACK
UDP KX acknowledgement.
struct GNUNET_PeerIdentity receiver
Presumed identity of the target of the UDP connection (UDP server)
static struct GNUNET_NAT_Handle * nat
Connection to NAT service.
struct GNUNET_CONTAINER_HeapNode * GNUNET_CONTAINER_heap_insert(struct GNUNET_CONTAINER_Heap *heap, void *element, GNUNET_CONTAINER_HeapCostType cost)
Inserts a new element into the heap.
static void run(void *cls, char *const *args, const char *cfgfile, const struct GNUNET_CONFIGURATION_Handle *c)
Setup communicator and launch network interactions.
uint32_t purpose
What does this signature vouch for? This must contain a GNUNET_SIGNATURE_PURPOSE_XXX constant (from g...
char gcm_tag[(128/8)]
HMAC for the following encrypted message, using GCM.
#define KCN_TARGET
How many KCNs do we keep around after we hit the KCN_THRESHOLD? Should be larger than KCN_THRESHOLD s...
struct GNUNET_TRANSPORT_AddressIdentifier * GNUNET_TRANSPORT_communicator_address_add(struct GNUNET_TRANSPORT_CommunicatorHandle *ch, const char *address, enum GNUNET_NetworkType nt, struct GNUNET_TIME_Relative expiration)
Notify transport service about an address that this communicator provides for this peer...
static struct GNUNET_PeerIdentity my_identity
Our public key.
struct GNUNET_HashCode cmac
CMAC is used to identify master in ACKs.
static struct SharedSecret * setup_shared_secret_dec(const struct GNUNET_CRYPTO_EcdhePublicKey *ephemeral)
Setup shared secret for decryption.
GNUNET_MQ_Error
Error codes for the queue.
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:1331
char gcm_tag[(128/8)]
128-bit authentication tag for the following encrypted message, from GCM.
socklen_t address_len
Number of bytes in address.
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
struct GNUNET_CONTAINER_HeapNode * hn
Entry in sender expiration heap.
int GNUNET_STRINGS_get_utf8_args(int argc, char *const *argv, int *u8argc, char *const **u8argv)
Returns utf-8 encoded arguments.
Definition: strings.c:1457
void GNUNET_TRANSPORT_application_validate(struct GNUNET_TRANSPORT_ApplicationHandle *ch, const struct GNUNET_PeerIdentity *peer, enum GNUNET_NetworkType nt, const char *addr)
An application (or a communicator) has received a HELLO (or other address data of another peer) and w...
static struct sockaddr * udp_address_to_sockaddr(const char *bindto, socklen_t *sock_len)
Convert UDP bind specification to a struct sockaddr *
struct GNUNET_CRYPTO_EcdhePublicKey ephemeral
Ephemeral key for KX.
struct GNUNET_TIME_Absolute GNUNET_TIME_relative_to_absolute(struct GNUNET_TIME_Relative rel)
Convert relative time to an absolute time in the future.
Definition: time.c:246
static void secret_destroy(struct SharedSecret *ss)
Destroy ss and associated key cache entries.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
Bandwidth allocation API for applications to interact with.
struct GNUNET_CRYPTO_EccSignaturePurpose purpose
Purpose must be GNUNET_SIGNATURE_COMMUNICATOR_UDP_BROADCAST.
static struct GNUNET_CONTAINER_MultiShortmap * key_cache
Cache of pre-generated key IDs.
static struct BroadcastInterface * bi_head
Broadcast interface tasks.
uint32_t sequence_allowed
Up to which sequence number did the other peer allow us to use this key, or up to which number did we...
socklen_t address_len
Length of the address.
struct sockaddr * address
Address of the other peer.
int GNUNET_NETWORK_socket_bind(struct GNUNET_NETWORK_Handle *desc, const struct sockaddr *address, socklen_t address_len)
Bind a socket to a particular address.
Definition: network.c:485
static struct GNUNET_FS_UnindexContext * uc
struct GNUNET_TIME_AbsoluteNBO monotonic_time
Monotonic time of sender, to possibly help detect replay attacks (if receiver persists times by sende...
unsigned int num_secrets
Length of the DLL at ss_head.
int GNUNET_CONTAINER_multishortmap_remove(struct GNUNET_CONTAINER_MultiShortmap *map, const struct GNUNET_ShortHashCode *key, const void *value)
Remove the given key-value pair from the map.
static struct GNUNET_NT_InterfaceScanner * is
Network scanner to determine network types.
static int ret
Return value of the commandline.
Definition: gnunet-abd.c:81
struct SharedSecret * ss
Corresponding shared secret.
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.
const char * GNUNET_i2s_full(const struct GNUNET_PeerIdentity *pid)
Convert a peer identity to a string (for printing debug messages).
#define GNUNET_memdup(buf, size)
Allocate and initialize a block of memory.
int GNUNET_CRYPTO_hkdf(void *result, size_t out_len, int xtr_algo, int prf_algo, const void *xts, size_t xts_len, const void *skm, size_t skm_len,...)
Derive key.
Definition: crypto_hkdf.c:320
Standard IPv4 header.
static void kce_destroy(struct KeyCacheEntry *kce)
Free memory used by key cache entry.
#define GNUNET_new(type)
Allocate a struct or union of the given type.
Definition of a command line option.
struct SenderAddress * sender
Sender we use this shared secret with, or NULL.
void GNUNET_OS_network_interfaces_list(GNUNET_OS_NetworkInterfaceProcessor proc, void *proc_cls)
Enumerate all network interfaces.
Definition: os_network.c:396
static int iface_proc(void *cls, const char *name, int isDefault, const struct sockaddr *addr, const struct sockaddr *broadcast_addr, const struct sockaddr *netmask, socklen_t addrlen)
Callback function invoked for each interface found.
static int have_v6_socket
GNUNET_YES if udp_sock supports IPv6.
#define GCM_TAG_SIZE
Size of the GCM tag.
struct GNUNET_TIME_Absolute timeout
Timeout for this sender.
static int handle_ack(void *cls, const struct GNUNET_PeerIdentity *pid, void *value)
We received an ACK for pid.
uint16_t size
The length of the struct (in bytes, including the length field itself), in big-endian format...
Encrypted continuation of UDP initial handshake, followed by message header with payload.
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.
#define GNUNET_SIGNATURE_COMMUNICATOR_UDP_HANDSHAKE
Signature used by UDP communicator handshake.
void GNUNET_SCHEDULER_shutdown(void)
Request the shutdown of a scheduler.
Definition: scheduler.c:531
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).
Handle for the service.
#define GNUNET_CRYPTO_eddsa_verify(purp, ps, sig, pub)
Verify EdDSA signature.
#define GNUNET_strdup(a)
Wrapper around GNUNET_xstrdup_.
Time for absolute time used by GNUnet, in microseconds and in network byte order. ...
void GNUNET_TRANSPORT_application_done(struct GNUNET_TRANSPORT_ApplicationHandle *ch)
Shutdown TRANSPORT application client.
static char * sockaddr_to_udpaddr_string(const struct sockaddr *address, socklen_t address_len)
Converts address to the address string format used by this communicator in HELLOs.
uint64_t abs_value_us
The actual value.
static void reschedule_sender_timeout(struct SenderAddress *sender)
Increment sender timeout due to activity.
static void bi_destroy(struct BroadcastInterface *bi)
An interface went away, stop broadcasting on it.
GNUNET_NetworkType
Types of networks (with separate quotas) we support.
Definition: gnunet_nt_lib.h:35
#define GNUNET_break(cond)
Use this for internal assertion violations that are not fatal (can be handled) but should not occur...
uint32_t sequence_number
Sequence number used to derive this entry from master key.
"Plaintext" header at beginning of KX message.
static void setup_cipher(const struct GNUNET_HashCode *msec, uint32_t serial, gcry_cipher_hd_t *cipher)
Setup cipher based on shared secret msec and serial number serial.
struct GNUNET_GETOPT_CommandLineOption GNUNET_GETOPT_OPTION_END
Definition: 002.c:13
#define GNUNET_NETWORK_STRUCT_BEGIN
Define as empty, GNUNET_PACKED should suffice, but this won&#39;t work on W32.
void GNUNET_CONTAINER_multipeermap_destroy(struct GNUNET_CONTAINER_MultiPeerMap *map)
Destroy a hash map.
A 256-bit hashcode.
Opaque handle to the transport service for communicators.
#define _(String)
GNU gettext support macro.
Definition: platform.h:184
void GNUNET_TRANSPORT_communicator_disconnect(struct GNUNET_TRANSPORT_CommunicatorHandle *ch)
Disconnect from the transport service.
struct GNUNET_ShortHashCode kid
Key and IV identification code.
struct GNUNET_CRYPTO_EddsaSignature sender_sig
Sender&#39;s signature of type GNUNET_SIGNATURE_COMMUNICATOR_UDP_HANDSHAKE.
struct sockaddr * ba
Broadcast address to use on the interface.
header of what an ECC signature signs this must be followed by "size - 8" bytes of the actual signed ...
static void enc_notify_cb(void *cls, const struct GNUNET_PeerIdentity *sender, const struct GNUNET_MessageHeader *msg)
Function called when the transport service has received a backchannel message for this communicator (...
struct GNUNET_ShortHashCode kid
Key and IV identification code.
static void ifc_broadcast(void *cls)
Broadcast our presence on one of our interfaces.
struct SharedSecret * ss_head
Shared secrets we used with target, first used is head.
void GNUNET_TRANSPORT_communicator_mq_del(struct GNUNET_TRANSPORT_QueueHandle *qh)
Notify transport service that an MQ became unavailable due to a disconnect or timeout.
struct GNUNET_PeerIdentity target
To whom are we talking to.
struct GNUNET_TRANSPORT_QueueHandle * d_qh
handle for default queue with the ch.
#define GNUNET_log_strerror(level, cmd)
Log an error message at log-level &#39;level&#39; that indicates a failure of the command &#39;cmd&#39; with the mess...
char * foreign_addr
Address of the receiver in the human-readable format with the COMMUNICATOR_ADDRESS_PREFIX.
void GNUNET_CRYPTO_ecdhe_key_create(struct GNUNET_CRYPTO_EcdhePrivateKey *pk)
Create a new private key.
Definition: crypto_ecc.c:508
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:1269
static struct GNUNET_CONTAINER_MultiPeerMap * receivers
Receivers (map from peer identity to struct ReceiverAddress)
uint16_t type
The type of the message (GNUNET_MESSAGE_TYPE_XXXX), in big-endian format.
Pre-generated "kid" code (key and IV identification code) to quickly derive master key for a struct U...
static struct GNUNET_SCHEDULER_Task * broadcast_task
ID of master broadcast task.
uint32_t sequence_used
Up to which sequence number did we use this master already? (for encrypting only) ...
static struct GNUNET_TIME_Relative timeout
Desired timeout for the lookup (default is no timeout).
Definition: gnunet-abd.c:61
struct GNUNET_MQ_Handle * GNUNET_MQ_queue_for_callbacks(GNUNET_MQ_SendImpl send, GNUNET_MQ_DestroyImpl destroy, GNUNET_MQ_CancelImpl cancel, void *impl_state, const struct GNUNET_MQ_MessageHandler *handlers, GNUNET_MQ_ErrorHandler error_handler, void *cls)
Create a message queue for the specified handlers.
Definition: mq.c:561
void GNUNET_log_config_missing(enum GNUNET_ErrorType kind, const char *section, const char *option)
Log error message about missing configuration option.
int GNUNET_CRYPTO_eddsa_ecdh(const struct GNUNET_CRYPTO_EddsaPrivateKey *priv, const struct GNUNET_CRYPTO_EcdhePublicKey *pub, struct GNUNET_HashCode *key_material)
Derive key material from a ECDH public key and a private EdDSA key.
Definition: crypto_ecc.c:1024
static char * value
Value of the record to add/remove.
static int get_sender_delete_it(void *cls, const struct GNUNET_PeerIdentity *target, void *value)
Iterator over all senders to clean up.
static int verify_confirmation(const struct GNUNET_CRYPTO_EcdhePublicKey *ephemeral, const struct UDPConfirmation *uc)
Check signature from uc against ephemeral.
#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
struct GNUNET_HashCode master
Master shared secret.
enum GNUNET_NetworkType nt
Which network type does this queue use?
#define GNUNET_SIGNATURE_COMMUNICATOR_UDP_BROADCAST
Signature used by UDP broadcasts.
struct GNUNET_MQ_Handle * kx_mq
KX message queue we are providing for the ch.
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:1296
struct KeyCacheEntry * kce_tail
Kept in a DLL, sorted by sequence number.
#define MAX_SECRETS
How many shared master secrets do we keep around at most per sender? Should be large enough so that w...
#define AES_IV_SIZE
AES (GCM) IV size.
void * GNUNET_CONTAINER_heap_peek(const struct GNUNET_CONTAINER_Heap *heap)
Get element stored at the root of heap.
static void pass_plaintext_to_core(struct SenderAddress *sender, const void *plaintext, size_t plaintext_len)
We received plaintext_len bytes of plaintext from a sender.
struct SharedSecret * ss_tail
Shared secrets we received with target, last used is tail.
size_t kx_mtu
MTU we allowed transport for this receiver&#39;s KX queue.
static void check_timeouts(void *cls)
Task run to check #receiver_heap and #sender_heap for timeouts.
ssize_t GNUNET_NETWORK_socket_sendto(const struct GNUNET_NETWORK_Handle *desc, const void *message, size_t length, const struct sockaddr *dest_addr, socklen_t dest_len)
Send data to a particular destination (always non-blocking).
Definition: network.c:850
struct GNUNET_CRYPTO_EccSignaturePurpose purpose
Purpose must be GNUNET_SIGNATURE_COMMUNICATOR_UDP_HANDSHAKE.
static char buf[2048]
#define COMMUNICATOR_ADDRESS_PREFIX
Address prefix used by the communicator.
struct GNUNET_TRANSPORT_CommunicatorHandle * GNUNET_TRANSPORT_communicator_connect(const struct GNUNET_CONFIGURATION_Handle *cfg, const char *config_section_name, const char *addr_prefix, enum GNUNET_TRANSPORT_CommunicatorCharacteristics cc, GNUNET_TRANSPORT_CommunicatorMqInit mq_init, void *mq_init_cls, GNUNET_TRANSPORT_CommunicatorNotify notify_cb, void *notify_cb_cls)
Connect to the transport service.
int GNUNET_CONTAINER_multishortmap_put(struct GNUNET_CONTAINER_MultiShortmap *map, const struct GNUNET_ShortHashCode *key, void *value, enum GNUNET_CONTAINER_MultiHashMapOption opt)
Store a key-value pair in the map.
#define GNUNET_TIME_UNIT_FOREVER_REL
Constant used to specify "forever".
Handle to a node in a heap.
struct GNUNET_PeerIdentity sender
Identity of the inititor of the UDP broadcast.
const char * GNUNET_a2s(const struct sockaddr *addr, socklen_t addrlen)
Convert a "struct sockaddr*" (IPv4 or IPv6 address) to a string (for printing debug messages)...
static struct GNUNET_CRYPTO_EddsaPrivateKey * my_private_key
Our private key.
struct sockaddr * address
Address of the other peer.
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_CONTAINER_MultiShortmap * GNUNET_CONTAINER_multishortmap_create(unsigned int len, int do_not_copy_keys)
Create a multi peer map (hash map for public keys of peers).
Heap with the minimum cost at the root.
void GNUNET_STATISTICS_set(struct GNUNET_STATISTICS_Handle *handle, const char *name, uint64_t value, int make_persistent)
Set statistic value for the peer.
UDP message box.
void GNUNET_CONTAINER_heap_destroy(struct GNUNET_CONTAINER_Heap *heap)
Destroys the heap.
struct sockaddr * sa
Sender&#39;s address of the interface.
A 512-bit hashcode.
socklen_t salen
Number of bytes in sa.
static void mq_destroy_kx(struct GNUNET_MQ_Handle *mq, void *impl_state)
Signature of functions implementing the destruction of a message queue.
static void sock_read(void *cls)
Socket read task.
int GNUNET_CRYPTO_ecdh_eddsa(const struct GNUNET_CRYPTO_EcdhePrivateKey *priv, const struct GNUNET_CRYPTO_EddsaPublicKey *pub, struct GNUNET_HashCode *key_material)
Derive key material from a EdDSA public key and a private ECDH key.
Definition: crypto_ecc.c:1084
static void mq_cancel(struct GNUNET_MQ_Handle *mq, void *impl_state)
Implementation function that cancels the currently sent message.
static void setup_receiver_mq(struct ReceiverAddress *receiver)
Setup the MQ for the receiver.
static int res
struct SharedSecret * next
Kept in a DLL.
Information we track per receiving address we have recently been in contact with (encryption to recei...
static struct GNUNET_NAT_AUTO_Test * nt
Handle to a NAT test operation.
void GNUNET_NT_scanner_done(struct GNUNET_NT_InterfaceScanner *is)
Terminate interface scanner.
Definition: nt.c:433
size_t d_mtu
MTU we allowed transport for this receiver&#39;s default queue.
int GNUNET_CONFIGURATION_get_value_string(const struct GNUNET_CONFIGURATION_Handle *cfg, const char *section, const char *option, char **value)
Get a configuration value that should be a string.
struct GNUNET_HashCode cmac
CMAC of the base key being acknowledged.
Node in the heap.
Private ECC key encoded for transmission.
void GNUNET_NAT_unregister(struct GNUNET_NAT_Handle *nh)
Stop port redirection and public IP address detection for the given handle.
Definition: nat_api.c:692
static void try_handle_plaintext(struct SenderAddress *sender, const void *buf, size_t buf_size)
Test if we have received a valid message in plaintext.
#define GNUNET_free_nz(ptr)
Wrapper around free.
Shared secret we generated for a particular sender or receiver.
struct GNUNET_TIME_AbsoluteNBO monotonic_time
Monotonic time of sender, to possibly help detect replay attacks (if receiver persists times by sende...
void GNUNET_TRANSPORT_communicator_address_remove(struct GNUNET_TRANSPORT_AddressIdentifier *ai)
Notify transport service about an address that this communicator no longer provides for this peer...
unsigned int num_secrets
Length of the DLL at ss_head.
struct GNUNET_TIME_Relative GNUNET_TIME_relative_min(struct GNUNET_TIME_Relative t1, struct GNUNET_TIME_Relative t2)
Return the minimum of two relative time values.
Definition: time.c:272
struct GNUNET_CRYPTO_EddsaSignature sender_sig
Sender&#39;s signature of type GNUNET_SIGNATURE_COMMUNICATOR_UDP_BROADCAST.
struct GNUNET_TESTBED_Peer * peer
The peer associated with this model.
struct GNUNET_HashCode key
The key used in the DHT.
Internal representation of the hash map.
static int mq_init(void *cls, const struct GNUNET_PeerIdentity *peer, const char *address)
Function called by the transport service to initialize a message queue given address information abou...
static struct GNUNET_TRANSPORT_AddressIdentifier * ai
Handle to the operation that publishes our address.
void GNUNET_CRYPTO_ecdhe_key_get_public(const struct GNUNET_CRYPTO_EcdhePrivateKey *priv, struct GNUNET_CRYPTO_EcdhePublicKey *pub)
Extract the public key for the given private key.
Definition: crypto_ecc.c:215
static int get_receiver_delete_it(void *cls, const struct GNUNET_PeerIdentity *target, void *value)
Iterator over all receivers to clean up.
static struct GNUNET_CONTAINER_Heap * senders_heap
Expiration heap for senders (contains struct SenderAddress)
struct GNUNET_NAT_Handle * GNUNET_NAT_register(const struct GNUNET_CONFIGURATION_Handle *cfg, const char *config_section, uint8_t proto, unsigned int num_addrs, const struct sockaddr **addrs, const socklen_t *addrlens, GNUNET_NAT_AddressCallback address_callback, GNUNET_NAT_ReversalCallback reversal_callback, void *callback_cls)
Attempt to enable port redirection and detect public IP address contacting UPnP or NAT-PMP routers on...
Definition: nat_api.c:378
static struct GNUNET_MQ_Envelope * ac
Handle to current GNUNET_PEERINFO_add_peer() operation.
struct GNUNET_NT_InterfaceScanner * GNUNET_NT_scanner_init(void)
Initialize the address characterization client handle.
Definition: nt.c:412
struct GNUNET_HashCode h_address
Hash of the sender&#39;s UDP address.
static void get_kid(const struct GNUNET_HashCode *msec, uint32_t serial, struct GNUNET_ShortHashCode *kid)
Compute kid.
struct GNUNET_TRANSPORT_QueueHandle * GNUNET_TRANSPORT_communicator_mq_add(struct GNUNET_TRANSPORT_CommunicatorHandle *ch, const struct GNUNET_PeerIdentity *peer, const char *address, uint32_t mtu, uint64_t q_len, uint32_t priority, enum GNUNET_NetworkType nt, enum GNUNET_TRANSPORT_ConnectionStatus cs, struct GNUNET_MQ_Handle *mq)
Notify transport service that a MQ became available due to an "inbound" connection or because the com...
static struct GNUNET_FS_SearchContext * sc
Definition: gnunet-search.c:37
Loopback (same host).
Definition: gnunet_nt_lib.h:45
static struct GNUNET_NETWORK_Handle * udp_sock
Our socket.
static void do_pad(gcry_cipher_hd_t out_cipher, char *dgram, size_t pad_size)
Pad dgram by pad_size using out_cipher.
unsigned int active_kce_count
Number of active KCN entries.
struct SharedSecret * prev
Kept in a DLL.
struct GNUNET_TIME_Absolute GNUNET_TIME_absolute_get_monotonic(const struct GNUNET_CONFIGURATION_Handle *cfg)
Obtain the current time and make sure it is monotonically increasing.
Definition: time.c:807
static struct GNUNET_CONTAINER_MultiPeerMap * senders
Senders (map from peer identity to struct SenderAddress)
int GNUNET_TRANSPORT_communicator_receive(struct GNUNET_TRANSPORT_CommunicatorHandle *handle, const struct GNUNET_PeerIdentity *sender, const struct GNUNET_MessageHeader *msg, struct GNUNET_TIME_Relative expected_addr_validity, GNUNET_TRANSPORT_MessageCompletedCallback cb, void *cb_cls)
Notify transport service that the communicator has received a message.
struct UDPBroadcast bcm
Message we broadcast on this interface.
static void decrypt_box(const struct UDPBox *box, size_t box_len, struct KeyCacheEntry *kce)
We received a box with matching kce.
void GNUNET_CONTAINER_multishortmap_destroy(struct GNUNET_CONTAINER_MultiShortmap *map)
Destroy a hash map.
struct GNUNET_CONTAINER_Heap * GNUNET_CONTAINER_heap_create(enum GNUNET_CONTAINER_HeapOrder order)
Create a new heap.
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:193
Standard IPv6 header.
static struct GNUNET_CONTAINER_Heap * receivers_heap
Expiration heap for receivers (contains struct ReceiverAddress)
static struct in_addr dummy
Target "dummy" address of the packet we pretend to respond to.
#define KCN_THRESHOLD
If we fall below this number of available KCNs, we generate additional ACKs until we reach KCN_TARGET...
Allow multiple values with the same key.
#define GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT
After how long do we consider a connection to a peer dead if we don&#39;t receive messages from the peer...
Handle to a message queue.
Definition: mq.c:85
unsigned int acks_available
Number of BOX keys from ACKs we have currently available for this receiver.
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;.
struct GNUNET_CONTAINER_HeapNode * hn
Entry in sender expiration heap.
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.
struct GNUNET_PeerIdentity sender
Sender&#39;s identity.
uint32_t sequence_max
Sequence acknowledgement limit.
struct ipv6_mreq mcreq
If this is an IPv6 interface, this is the request we use to join/leave the group. ...
The identity of the host (wraps the signing key of the peer).
#define AES_KEY_SIZE
AES key size.
static void reschedule_receiver_timeout(struct ReceiverAddress *receiver)
Increment receiver timeout due to activity.
struct ReceiverAddress * receiver
Receiver we use this shared secret with, or NULL.
Context information to be used while searching for operation contexts.
Definition: testbed_api.c:225
static void get_iv_key(const struct GNUNET_HashCode *msec, uint32_t serial, char key[(256/8)], char iv[(96/8)])
Compute key and iv.
struct GNUNET_TRANSPORT_ApplicationHandle * GNUNET_TRANSPORT_application_init(const struct GNUNET_CONFIGURATION_Handle *cfg)
Initialize the TRANSPORT application client handle.
#define GNUNET_PACKED
gcc-ism to get packed structs.
#define GNUNET_TRANSPORT_QUEUE_LENGTH_UNLIMITED
Queue length.
static uint16_t port
Port number.
Definition: gnunet-bcd.c:82
configuration data
Definition: configuration.c:84
void * GNUNET_CONTAINER_multishortmap_get(const struct GNUNET_CONTAINER_MultiShortmap *map, const struct GNUNET_ShortHashCode *key)
Given a key find a value in the map matching the key.
socklen_t address_len
Length of the address.
const char * name
this is an outbound connection (transport initiated)
#define ADDRESS_VALIDITY_PERIOD
How long do we believe our addresses to remain up (before the other peer should revalidate).
Information we track per sender address we have recently been in contact with (we decrypt messages fr...
Signature we use to verify that the broadcast was really made by the peer that claims to have made it...
#define INTERFACE_SCAN_FREQUENCY
How often do we scan for changes to our network interfaces?
void GNUNET_TRANSPORT_communicator_notify(struct GNUNET_TRANSPORT_CommunicatorHandle *ch, const struct GNUNET_PeerIdentity *pid, const char *comm, const struct GNUNET_MessageHeader *header)
The communicator asks the transport service to route a message via a different path to another commun...
Public ECC key (always for Curve25519) encoded in a format suitable for network transmission and encr...
struct GNUNET_MQ_Handle * mq
Definition: 003.c:5
static void receiver_destroy(struct ReceiverAddress *receiver)
Destroys a receiving state due to timeout or shutdown.
#define GNUNET_log(kind,...)
UDP key acknowledgement.
Entry in list of pending tasks.
Definition: scheduler.c:134
static struct GNUNET_STATISTICS_Handle * stats
For logging statistics.
Signature we use to verify that the ephemeral key was really chosen by the specified sender...
static struct GNUNET_SCHEDULER_Task * read_task
ID of read task.
handle to a socket
Definition: network.c:52
static void nat_address_cb(void *cls, void **app_ctx, int add_remove, enum GNUNET_NAT_AddressClass ac, const struct sockaddr *addr, socklen_t addrlen)
Signature of the callback passed to GNUNET_NAT_register() for a function to call whenever our set of ...
void GNUNET_CRYPTO_random_block(enum GNUNET_CRYPTO_Quality mode, void *buffer, size_t length)
Fill block with a random values.
int GNUNET_PROGRAM_run(int argc, char *const *argv, const char *binaryName, const char *binaryHelp, const struct GNUNET_GETOPT_CommandLineOption *options, GNUNET_PROGRAM_Main task, void *task_cls)
Run a standard GNUnet command startup sequence (initialize loggers and configuration, parse options).
Definition: program.c:367
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...
static struct SharedSecret * setup_shared_secret_enc(const struct GNUNET_CRYPTO_EcdhePrivateKey *ephemeral, struct ReceiverAddress *receiver)
Setup shared secret for encryption.
struct GNUNET_SCHEDULER_Task * broadcast_task
Task for this broadcast interface.
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
static void calculate_cmac(struct SharedSecret *ss)
Calcualte cmac from master in ss.
enum GNUNET_TESTBED_UnderlayLinkModelType type
the type of this model
Header for all communications.
static int find_sender_by_address(void *cls, const struct GNUNET_PeerIdentity *key, void *value)
Find existing struct SenderAddress by matching addresses.
Time for absolute times used by GNUnet, in microseconds.
void GNUNET_MQ_destroy(struct GNUNET_MQ_Handle *mq)
Destroy the message queue.
Definition: mq.c:833
static void mq_error(void *cls, enum GNUNET_MQ_Error error)
Generic error handler, called with the appropriate error code and the same closure specified at the c...
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_read_net(struct GNUNET_TIME_Relative delay, struct GNUNET_NETWORK_Handle *rfd, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run with a specified delay or when the specified file descriptor is ready f...
Definition: scheduler.c:1517
struct SenderAddress * sender
Return value to set if we found a match.
unsigned int GNUNET_CONTAINER_multipeermap_size(const struct GNUNET_CONTAINER_MultiPeerMap *map)
Get the number of key-value pairs in the map.
#define MAX_SQN_DELTA
What is the maximum delta between KCN sequence numbers that we allow.
struct GNUNET_CRYPTO_EcdhePublicKey ephemeral
Ephemeral key used by the sender.
static struct GNUNET_TRANSPORT_CommunicatorHandle * ch
Our environment.
struct GNUNET_PeerIdentity target
To whom are we talking to.
static struct GNUNET_PeerIdentity pid
Identity of the peer we transmit to / connect to.
static void mq_send_kx(struct GNUNET_MQ_Handle *mq, const struct GNUNET_MessageHeader *msg, void *impl_state)
Signature of functions implementing the sending functionality of a message queue. ...
int GNUNET_CONFIGURATION_get_value_yesno(const struct GNUNET_CONFIGURATION_Handle *cfg, const char *section, const char *option)
Get a configuration value that should be in a set of "YES" or "NO".
ssize_t GNUNET_NETWORK_socket_recvfrom(const struct GNUNET_NETWORK_Handle *desc, void *buffer, size_t length, struct sockaddr *src_addr, socklen_t *addrlen)
Read data from a socket (always non-blocking).
Definition: network.c:754
struct GNUNET_TIME_Absolute timeout
Timeout for this receiver address.
static void kce_generate(struct SharedSecret *ss, uint32_t seq)
Setup key cache entry for sequence number seq and shared secret ss.
void * GNUNET_CONTAINER_heap_remove_node(struct GNUNET_CONTAINER_HeapNode *node)
Removes a node from the heap.
static void do_shutdown(void *cls)
Shutdown the UNIX communicator.
Interface we broadcast our presence on.
Handle to the TRANSPORT subsystem for application management.
struct GNUNET_TIME_AbsoluteNBO GNUNET_TIME_absolute_hton(struct GNUNET_TIME_Absolute a)
Convert absolute time to network byte order.
Definition: time.c:657
static char * address
GNS address for this phone.
void GNUNET_MQ_impl_send_continue(struct GNUNET_MQ_Handle *mq)
Call the send implementation for the next queued message, if any.
Definition: mq.c:495
struct GNUNET_TRANSPORT_QueueHandle * kx_qh
handle for KX queue with the ch.
const char * GNUNET_i2s(const struct GNUNET_PeerIdentity *pid)
Convert a peer identity to a string (for printing debug messages).
struct BroadcastInterface * prev
Kept in a DLL.
static const struct GNUNET_CONFIGURATION_Handle * cfg
Our configuration.
static void sender_destroy(struct SenderAddress *sender)
Functions with this signature are called whenever we need to close a sender&#39;s state due to timeout...
Handle returned to identify the internal data structure the transport API has created to manage a mes...
int GNUNET_NETWORK_socket_close(struct GNUNET_NETWORK_Handle *desc)
Close a socket.
Definition: network.c:560
int GNUNET_CONTAINER_multipeermap_get_multiple(struct GNUNET_CONTAINER_MultiPeerMap *map, const struct GNUNET_PeerIdentity *key, GNUNET_CONTAINER_PeerMapIterator it, void *it_cls)
Iterate over all entries in the map that match a particular key.
No good quality of the operation is needed (i.e., random numbers can be pseudo-random).
#define GNUNET_malloc(size)
Wrapper around malloc.
void GNUNET_TRANSPORT_communicator_mq_update(struct GNUNET_TRANSPORT_CommunicatorHandle *ch, const struct GNUNET_TRANSPORT_QueueHandle *u_qh, uint64_t q_len, uint32_t priority)
Notify transport service that an MQ was updated.
int GNUNET_NETWORK_test_pf(int pf)
Test if the given protocol family is supported by this system.
Definition: network.c:85
struct BroadcastInterface * next
Kept in a DLL.
Internal representation of an address a communicator is currently providing for the transport service...
#define GNUNET_free(ptr)
Wrapper around free.
Time for relative time used by GNUnet, in microseconds.
struct GNUNET_CRYPTO_EddsaPublicKey public_key
struct GNUNET_NETWORK_Handle * GNUNET_NETWORK_socket_create(int domain, int type, int protocol)
Create a new socket.
Definition: network.c:912
struct SharedSecret * ss_head
Shared secrets we received from target, first used is head.
static struct GNUNET_SCHEDULER_Task * timeout_task
ID of timeout task.
const struct sockaddr * address
Address we are looking for.
void * GNUNET_SCHEDULER_cancel(struct GNUNET_SCHEDULER_Task *task)
Cancel the task with the specified identifier.
Definition: scheduler.c:972
static int try_decrypt(const struct SharedSecret *ss, const char tag[(128/8)], uint32_t serial, const char *in_buf, size_t in_buf_size, char *out_buf)
Try to decrypt buf using shared secret ss and key/iv derived using serial.
struct GNUNET_MQ_Handle * d_mq
Default message queue we are providing for the ch.
enum GNUNET_NetworkType nt
Which network type does this queue use?