DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Header

Mercurial (31ec81b5d7bb)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this file,
 * You can obtain one at http://mozilla.org/MPL/2.0/. */

#include <stdio.h>
#include <stdlib.h>
#if !defined(__Userspace_os_Windows)
#include <arpa/inet.h>
#endif
// usrsctp.h expects to have errno definitions prior to its inclusion.
#include <errno.h>

#define SCTP_DEBUG 1
#define SCTP_STDINT_INCLUDE <stdint.h>

#ifdef _MSC_VER
// Disable "warning C4200: nonstandard extension used : zero-sized array in
//          struct/union"
// ...which the third-party file usrsctp.h runs afoul of.
#pragma warning(push)
#pragma warning(disable:4200)
#endif

#include "usrsctp.h"

#ifdef _MSC_VER
#pragma warning(pop)
#endif

#include "DataChannelLog.h"

#include "nsServiceManagerUtils.h"
#include "nsIObserverService.h"
#include "nsIObserver.h"
#include "mozilla/Services.h"
#include "nsThreadUtils.h"
#include "nsAutoPtr.h"
#include "nsNetUtil.h"
#include "mozilla/StaticPtr.h"
#ifdef MOZ_PEERCONNECTION
#include "mtransport/runnable_utils.h"
#endif

#define DATACHANNEL_LOG(args) LOG(args)
#include "DataChannel.h"
#include "DataChannelProtocol.h"

#ifdef PR_LOGGING
PRLogModuleInfo*
GetDataChannelLog()
{
  static PRLogModuleInfo* sLog;
  if (!sLog)
    sLog = PR_NewLogModule("DataChannel");
  return sLog;
}

PRLogModuleInfo*
GetSCTPLog()
{
  static PRLogModuleInfo* sLog;
  if (!sLog)
    sLog = PR_NewLogModule("SCTP");
  return sLog;
}
#endif

// Let us turn on and off important assertions in non-debug builds
#ifdef DEBUG
#define ASSERT_WEBRTC(x) MOZ_ASSERT((x))
#elif defined(MOZ_WEBRTC_ASSERT_ALWAYS)
#define ASSERT_WEBRTC(x) do { if (!(x)) { MOZ_CRASH(); } } while (0)
#endif

static bool sctp_initialized;

namespace mozilla {

class DataChannelShutdown;
StaticRefPtr<DataChannelShutdown> gDataChannelShutdown;

class DataChannelShutdown : public nsIObserver
{
public:
  // This needs to be tied to some form object that is guaranteed to be
  // around (singleton likely) unless we want to shutdown sctp whenever
  // we're not using it (and in which case we'd keep a refcnt'd object
  // ref'd by each DataChannelConnection to release the SCTP usrlib via
  // sctp_finish)

  NS_DECL_ISUPPORTS

  DataChannelShutdown() {}

  void Init()
    {
      nsCOMPtr<nsIObserverService> observerService =
        mozilla::services::GetObserverService();
      if (!observerService)
        return;

      nsresult rv = observerService->AddObserver(this,
                                                 "profile-change-net-teardown",
                                                 false);
      MOZ_ASSERT(rv == NS_OK);
      (void) rv;
    }

  virtual ~DataChannelShutdown()
    {
      nsCOMPtr<nsIObserverService> observerService =
        mozilla::services::GetObserverService();
      if (observerService)
        observerService->RemoveObserver(this, "profile-change-net-teardown");
    }

  NS_IMETHODIMP Observe(nsISupports* aSubject, const char* aTopic,
                        const PRUnichar* aData) {
    if (strcmp(aTopic, "profile-change-net-teardown") == 0) {
      LOG(("Shutting down SCTP"));
      if (sctp_initialized) {
        usrsctp_finish();
        sctp_initialized = false;
      }
      nsCOMPtr<nsIObserverService> observerService =
        mozilla::services::GetObserverService();
      if (!observerService)
        return NS_ERROR_FAILURE;

      nsresult rv = observerService->RemoveObserver(this,
                                                    "profile-change-net-teardown");
      MOZ_ASSERT(rv == NS_OK);
      (void) rv;

      nsRefPtr<DataChannelShutdown> kungFuDeathGrip(this);
      gDataChannelShutdown = nullptr;
    }
    return NS_OK;
  }
};

NS_IMPL_ISUPPORTS1(DataChannelShutdown, nsIObserver);


BufferedMsg::BufferedMsg(struct sctp_sendv_spa &spa, const char *data,
                         uint32_t length) : mLength(length)
{
  mSpa = new sctp_sendv_spa;
  *mSpa = spa;
  char *tmp = new char[length]; // infallible malloc!
  memcpy(tmp, data, length);
  mData = tmp;
}

BufferedMsg::~BufferedMsg()
{
  delete mSpa;
  delete mData;
}

static int
receive_cb(struct socket* sock, union sctp_sockstore addr,
           void *data, size_t datalen,
           struct sctp_rcvinfo rcv, int flags, void *ulp_info)
{
  DataChannelConnection *connection = static_cast<DataChannelConnection*>(ulp_info);
  return connection->ReceiveCallback(sock, data, datalen, rcv, flags);
}

#ifdef PR_LOGGING
static void
debug_printf(const char *format, ...)
{
  va_list ap;
  char buffer[1024];

  if (PR_LOG_TEST(GetSCTPLog(), PR_LOG_ALWAYS)) {
    va_start(ap, format);
#ifdef _WIN32
    if (vsnprintf_s(buffer, sizeof(buffer), _TRUNCATE, format, ap) > 0) {
#else
    if (vsnprintf(buffer, sizeof(buffer), format, ap) > 0) {
#endif
      PR_LogPrint("%s", buffer);
    }
    va_end(ap);
  }
}
#endif

DataChannelConnection::DataChannelConnection(DataConnectionListener *listener) :
   mLock("netwerk::sctp::DataChannelConnection")
{
  mState = CLOSED;
  mSocket = nullptr;
  mMasterSocket = nullptr;
  mListener = listener->asWeakPtr();
  mLocalPort = 0;
  mRemotePort = 0;
  mDeferTimeout = 10;
  mTimerRunning = false;
  LOG(("Constructor DataChannelConnection=%p, listener=%p", this, mListener.get()));
}

DataChannelConnection::~DataChannelConnection()
{
  LOG(("Deleting DataChannelConnection %p", (void *) this));
  // This may die on the MainThread, or on the STS thread
  ASSERT_WEBRTC(mState == CLOSED);
  MOZ_ASSERT(!mMasterSocket);
  MOZ_ASSERT(mPending.GetSize() == 0);

  // Already disconnected from sigslot/mTransportFlow
  // TransportFlows must be released from the STS thread
  if (mTransportFlow && !IsSTSThread()) {
    ASSERT_WEBRTC(mSTS);
    RUN_ON_THREAD(mSTS, WrapRunnableNM(ReleaseTransportFlow, mTransportFlow.forget()),
                  NS_DISPATCH_NORMAL);
  }
}

void
DataChannelConnection::Destroy()
{
  // Though it's probably ok to do this and close the sockets;
  // if we really want it to do true clean shutdowns it can
  // create a dependant Internal object that would remain around
  // until the network shut down the association or timed out.
  LOG(("Destroying DataChannelConnection %p", (void *) this));
  ASSERT_WEBRTC(NS_IsMainThread());
  CloseAll();

  MutexAutoLock lock(mLock);
  // If we had a pending reset, we aren't waiting for it - clear the list so
  // we can deregister this DataChannelConnection without leaking.
  ClearResets();

  MOZ_ASSERT(mSTS);
  ASSERT_WEBRTC(NS_IsMainThread());
  // Finish Destroy on STS thread to avoid bug 876167 - once that's fixed,
  // the usrsctp_close() calls can move back here (and just proxy the
  // disconnect_all())
  RUN_ON_THREAD(mSTS, WrapRunnable(nsRefPtr<DataChannelConnection>(this),
                                   &DataChannelConnection::DestroyOnSTS,
                                   mSocket, mMasterSocket),
                NS_DISPATCH_NORMAL);

  // These will be released on STS
  mSocket = nullptr;
  mMasterSocket = nullptr; // also a flag that we've Destroyed this connection

  // Must do this in Destroy() since we may then delete this object
  if (mUsingDtls) {
    usrsctp_deregister_address(static_cast<void *>(this));
    LOG(("Deregistered %p from the SCTP stack.", static_cast<void *>(this)));
  }

  // We can't get any more new callbacks from the SCTP library
  // All existing callbacks have refs to DataChannelConnection

  // nsDOMDataChannel objects have refs to DataChannels that have refs to us
}

void DataChannelConnection::DestroyOnSTS(struct socket *aMasterSocket,
                                         struct socket *aSocket)
{
  if (aSocket && aSocket != aMasterSocket)
    usrsctp_close(aSocket);
  if (aMasterSocket)
    usrsctp_close(aMasterSocket);

  disconnect_all();
}

NS_IMPL_ISUPPORTS1(DataChannelConnection,
                   nsITimerCallback)

bool
DataChannelConnection::Init(unsigned short aPort, uint16_t aNumStreams, bool aUsingDtls)
{
  struct sctp_initmsg initmsg;
  struct sctp_udpencaps encaps;
  struct sctp_assoc_value av;
  struct sctp_event event;
  socklen_t len;

  uint16_t event_types[] = {SCTP_ASSOC_CHANGE,
                            SCTP_PEER_ADDR_CHANGE,
                            SCTP_REMOTE_ERROR,
                            SCTP_SHUTDOWN_EVENT,
                            SCTP_ADAPTATION_INDICATION,
                            SCTP_SEND_FAILED_EVENT,
                            SCTP_STREAM_RESET_EVENT,
                            SCTP_STREAM_CHANGE_EVENT};
  {
    ASSERT_WEBRTC(NS_IsMainThread());

    // MutexAutoLock lock(mLock); Not needed since we're on mainthread always
    if (!sctp_initialized) {
      if (aUsingDtls) {
        LOG(("sctp_init(DTLS)"));
#ifdef MOZ_PEERCONNECTION
        usrsctp_init(0,
                     DataChannelConnection::SctpDtlsOutput,
#ifdef PR_LOGGING
                     debug_printf
#else
                     nullptr
#endif
                    );
#else
        NS_ASSERTION(!aUsingDtls, "Trying to use SCTP/DTLS without mtransport");
#endif
      } else {
        LOG(("sctp_init(%u)", aPort));
        usrsctp_init(aPort,
                     nullptr,
#ifdef PR_LOGGING
                     debug_printf
#else
                     nullptr
#endif
                    );
      }

#ifdef PR_LOGGING
      // Set logging to SCTP:PR_LOG_DEBUG to get SCTP debugs
      if (PR_LOG_TEST(GetSCTPLog(), PR_LOG_ALWAYS)) {
        usrsctp_sysctl_set_sctp_debug_on(SCTP_DEBUG_ALL);
      }
#endif
      usrsctp_sysctl_set_sctp_blackhole(2);
      // ECN is currently not supported by the Firefox code
      usrsctp_sysctl_set_sctp_ecn_enable(0);
      sctp_initialized = true;

      gDataChannelShutdown = new DataChannelShutdown();
      gDataChannelShutdown->Init();
    }
  }

  // XXX FIX! make this a global we get once
  // Find the STS thread
  nsresult rv;
  mSTS = do_GetService(NS_SOCKETTRANSPORTSERVICE_CONTRACTID, &rv);
  MOZ_ASSERT(NS_SUCCEEDED(rv));

  // Open sctp with a callback
  if ((mMasterSocket = usrsctp_socket(
         aUsingDtls ? AF_CONN : AF_INET,
         SOCK_STREAM, IPPROTO_SCTP, receive_cb, nullptr, 0, this)) == nullptr) {
    return false;
  }

  // Make non-blocking for bind/connect.  SCTP over UDP defaults to non-blocking
  // in associations for normal IO
  if (usrsctp_set_non_blocking(mMasterSocket, 1) < 0) {
    LOG(("Couldn't set non_blocking on SCTP socket"));
    // We can't handle connect() safely if it will block, not that this will
    // even happen.
    goto error_cleanup;
  }

  // Make sure when we close the socket, make sure it doesn't call us back again!
  // This would cause it try to use an invalid DataChannelConnection pointer
  struct linger l;
  l.l_onoff = 1;
  l.l_linger = 0;
  if (usrsctp_setsockopt(mMasterSocket, SOL_SOCKET, SO_LINGER,
                         (const void *)&l, (socklen_t)sizeof(struct linger)) < 0) {
    LOG(("Couldn't set SO_LINGER on SCTP socket"));
    // unsafe to allow it to continue if this fails
    goto error_cleanup;
  }

  // XXX Consider disabling this when we add proper SDP negotiation.
  // We may want to leave enabled for supporting 'cloning' of SDP offers, which
  // implies re-use of the same pseudo-port number, or forcing a renegotiation.
  {
    uint32_t on = 1;
    if (usrsctp_setsockopt(mMasterSocket, IPPROTO_SCTP, SCTP_REUSE_PORT,
                           (const void *)&on, (socklen_t)sizeof(on)) < 0) {
      LOG(("Couldn't set SCTP_REUSE_PORT on SCTP socket"));
    }
  }

  if (!aUsingDtls) {
    memset(&encaps, 0, sizeof(encaps));
    encaps.sue_address.ss_family = AF_INET;
    encaps.sue_port = htons(aPort);
    if (usrsctp_setsockopt(mMasterSocket, IPPROTO_SCTP, SCTP_REMOTE_UDP_ENCAPS_PORT,
                           (const void*)&encaps,
                           (socklen_t)sizeof(struct sctp_udpencaps)) < 0) {
      LOG(("*** failed encaps errno %d", errno));
      goto error_cleanup;
    }
    LOG(("SCTP encapsulation local port %d", aPort));
  }

  av.assoc_id = SCTP_ALL_ASSOC;
  av.assoc_value = SCTP_ENABLE_RESET_STREAM_REQ | SCTP_ENABLE_CHANGE_ASSOC_REQ;
  if (usrsctp_setsockopt(mMasterSocket, IPPROTO_SCTP, SCTP_ENABLE_STREAM_RESET, &av,
                         (socklen_t)sizeof(struct sctp_assoc_value)) < 0) {
    LOG(("*** failed enable stream reset errno %d", errno));
    goto error_cleanup;
  }

  /* Enable the events of interest. */
  memset(&event, 0, sizeof(event));
  event.se_assoc_id = SCTP_ALL_ASSOC;
  event.se_on = 1;
  for (uint32_t i = 0; i < sizeof(event_types)/sizeof(event_types[0]); ++i) {
    event.se_type = event_types[i];
    if (usrsctp_setsockopt(mMasterSocket, IPPROTO_SCTP, SCTP_EVENT, &event, sizeof(event)) < 0) {
      LOG(("*** failed setsockopt SCTP_EVENT errno %d", errno));
      goto error_cleanup;
    }
  }

  // Update number of streams
  mStreams.AppendElements(aNumStreams);
  for (uint32_t i = 0; i < aNumStreams; ++i) {
    mStreams[i] = nullptr;
  }
  memset(&initmsg, 0, sizeof(initmsg));
  len = sizeof(initmsg);
  if (usrsctp_getsockopt(mMasterSocket, IPPROTO_SCTP, SCTP_INITMSG, &initmsg, &len) < 0) {
    LOG(("*** failed getsockopt SCTP_INITMSG"));
    goto error_cleanup;
  }
  LOG(("Setting number of SCTP streams to %u, was %u/%u", aNumStreams,
       initmsg.sinit_num_ostreams, initmsg.sinit_max_instreams));
  initmsg.sinit_num_ostreams  = aNumStreams;
  initmsg.sinit_max_instreams = MAX_NUM_STREAMS;
  if (usrsctp_setsockopt(mMasterSocket, IPPROTO_SCTP, SCTP_INITMSG, &initmsg,
                         (socklen_t)sizeof(initmsg)) < 0) {
    LOG(("*** failed setsockopt SCTP_INITMSG, errno %d", errno));
    goto error_cleanup;
  }

  mSocket = nullptr;
  if (aUsingDtls) {
    mUsingDtls = true;
    usrsctp_register_address(static_cast<void *>(this));
    LOG(("Registered %p within the SCTP stack.", static_cast<void *>(this)));
  } else {
    mUsingDtls = false;
  }
  return true;

error_cleanup:
  usrsctp_close(mMasterSocket);
  mMasterSocket = nullptr;
  mUsingDtls = false;
  return false;
}

void
DataChannelConnection::StartDefer()
{
  nsresult rv;
  if (!NS_IsMainThread()) {
    NS_DispatchToMainThread(new DataChannelOnMessageAvailable(
                            DataChannelOnMessageAvailable::START_DEFER,
                            this, (DataChannel *) nullptr));
    return;
  }

  ASSERT_WEBRTC(NS_IsMainThread());
  if (!mDeferredTimer) {
    mDeferredTimer = do_CreateInstance("@mozilla.org/timer;1", &rv);
    MOZ_ASSERT(mDeferredTimer);
  }

  if (!mTimerRunning) {
    rv = mDeferredTimer->InitWithCallback(this, mDeferTimeout,
                                          nsITimer::TYPE_ONE_SHOT);
    NS_ENSURE_TRUE_VOID(rv == NS_OK);

    mTimerRunning = true;
  }
}

// nsITimerCallback

NS_IMETHODIMP
DataChannelConnection::Notify(nsITimer *timer)
{
  ASSERT_WEBRTC(NS_IsMainThread());
  LOG(("%s: %p [%p] (%dms), sending deferred messages", __FUNCTION__, this, timer, mDeferTimeout));

  if (timer == mDeferredTimer) {
    if (SendDeferredMessages()) {
      // Still blocked
      // we don't need a lock, since this must be main thread...
      nsresult rv = mDeferredTimer->InitWithCallback(this, mDeferTimeout,
                                                     nsITimer::TYPE_ONE_SHOT);
      if (NS_FAILED(rv)) {
        LOG(("%s: cannot initialize open timer", __FUNCTION__));
        // XXX and do....?
        return rv;
      }
      mTimerRunning = true;
    } else {
      LOG(("Turned off deferred send timer"));
      mTimerRunning = false;
    }
  }
  return NS_OK;
}

#ifdef MOZ_PEERCONNECTION
void
DataChannelConnection::SetEvenOdd()
{
  ASSERT_WEBRTC(IsSTSThread());

  TransportLayerDtls *dtls = static_cast<TransportLayerDtls *>(
      mTransportFlow->GetLayer(TransportLayerDtls::ID()));
  MOZ_ASSERT(dtls);  // DTLS is mandatory
  mAllocateEven = (dtls->role() == TransportLayerDtls::CLIENT);
}

bool
DataChannelConnection::ConnectViaTransportFlow(TransportFlow *aFlow, uint16_t localport, uint16_t remoteport)
{
  LOG(("Connect DTLS local %u, remote %u", localport, remoteport));

  NS_PRECONDITION(mMasterSocket, "SCTP wasn't initialized before ConnectViaTransportFlow!");
  NS_ENSURE_TRUE(aFlow, false);

  mTransportFlow = aFlow;
  mLocalPort = localport;
  mRemotePort = remoteport;
  mState = CONNECTING;

  RUN_ON_THREAD(mSTS, WrapRunnable(nsRefPtr<DataChannelConnection>(this),
                                   &DataChannelConnection::SetSignals),
                NS_DISPATCH_NORMAL);
  return true;
}

void
DataChannelConnection::SetSignals()
{
  ASSERT_WEBRTC(IsSTSThread());
  ASSERT_WEBRTC(mTransportFlow);
  LOG(("Setting transport signals, state: %d", mTransportFlow->state()));
  mTransportFlow->SignalPacketReceived.connect(this, &DataChannelConnection::SctpDtlsInput);
  // SignalStateChange() doesn't call you with the initial state
  mTransportFlow->SignalStateChange.connect(this, &DataChannelConnection::CompleteConnect);
  CompleteConnect(mTransportFlow, mTransportFlow->state());
}

void
DataChannelConnection::CompleteConnect(TransportFlow *flow, TransportLayer::State state)
{
  LOG(("Data transport state: %d", state));
  MutexAutoLock lock(mLock);
  ASSERT_WEBRTC(IsSTSThread());
  // We should abort connection on TS_ERROR.
  // Note however that the association will also fail (perhaps with a delay) and
  // notify us in that way
  if (state != TransportLayer::TS_OPEN || !mMasterSocket)
    return;

  struct sockaddr_conn addr;
  memset(&addr, 0, sizeof(addr));
  addr.sconn_family = AF_CONN;
#if defined(__Userspace_os_Darwin)
  addr.sconn_len = sizeof(addr);
#endif
  addr.sconn_port = htons(mLocalPort);
  addr.sconn_addr = static_cast<void *>(this);

  LOG(("Calling usrsctp_bind"));
  int r = usrsctp_bind(mMasterSocket, reinterpret_cast<struct sockaddr *>(&addr),
                       sizeof(addr));
  if (r < 0) {
    LOG(("usrsctp_bind failed: %d", r));
  } else {
    // This is the remote addr
    addr.sconn_port = htons(mRemotePort);
    LOG(("Calling usrsctp_connect"));
    r = usrsctp_connect(mMasterSocket, reinterpret_cast<struct sockaddr *>(&addr),
                        sizeof(addr));
    if (r < 0) {
      if (errno == EINPROGRESS) {
        // non-blocking
        return;
      } else {
        LOG(("usrsctp_connect failed: %d", errno));
        mState = CLOSED;
      }
    } else {
      // We set Even/Odd and fire ON_CONNECTION via SCTP_COMM_UP when we get that
      // This also avoids issues with calling TransportFlow stuff on Mainthread
      return;
    }
  }
  // Note: currently this doesn't actually notify the application
  NS_DispatchToMainThread(new DataChannelOnMessageAvailable(
                            DataChannelOnMessageAvailable::ON_CONNECTION,
                            this, false));
  return;
}

// Process any pending Opens
void
DataChannelConnection::ProcessQueuedOpens()
{
  // The nsDeque holds channels with an AddRef applied.  Another reference
  // (may) be held by the DOMDataChannel, unless it's been GC'd.  No other
  // references should exist.

  // Can't copy nsDeque's.  Move into temp array since any that fail will
  // go back to mPending
  nsDeque temp;
  DataChannel *temp_channel; // really already_AddRefed<>
  while (nullptr != (temp_channel = static_cast<DataChannel *>(mPending.PopFront()))) {
    temp.Push(static_cast<void *>(temp_channel));
  }

  nsRefPtr<DataChannel> channel;
  // All these entries have an AddRef(); make that explicit now via the dont_AddRef()
  while (nullptr != (channel = dont_AddRef(static_cast<DataChannel *>(temp.PopFront())))) {
    if (channel->mFlags & DATA_CHANNEL_FLAGS_FINISH_OPEN) {
      LOG(("Processing queued open for %p (%u)", channel.get(), channel->mStream));
      channel->mFlags &= ~DATA_CHANNEL_FLAGS_FINISH_OPEN;
      // OpenFinish returns a reference itself, so we need to take it can Release it
      channel = OpenFinish(channel.forget()); // may reset the flag and re-push
    } else {
      NS_ASSERTION(false, "How did a DataChannel get queued without the FINISH_OPEN flag?");
    }
  }

}
void
DataChannelConnection::SctpDtlsInput(TransportFlow *flow,
                                     const unsigned char *data, size_t len)
{
#ifdef PR_LOGGING
  if (PR_LOG_TEST(GetSCTPLog(), PR_LOG_DEBUG)) {
    char *buf;

    if ((buf = usrsctp_dumppacket((void *)data, len, SCTP_DUMP_INBOUND)) != NULL) {
      PR_LogPrint("%s", buf);
      usrsctp_freedumpbuffer(buf);
    }
  }
#endif
  // Pass the data to SCTP
  usrsctp_conninput(static_cast<void *>(this), data, len, 0);
}

int
DataChannelConnection::SendPacket(const unsigned char *data, size_t len, bool release)
{
  //LOG(("%p: SCTP/DTLS sent %ld bytes", this, len));
  int res = mTransportFlow->SendPacket(data, len) < 0 ? 1 : 0;
  if (release)
    delete data;
  return res;
}

/* static */
int
DataChannelConnection::SctpDtlsOutput(void *addr, void *buffer, size_t length,
                                      uint8_t tos, uint8_t set_df)
{
  DataChannelConnection *peer = static_cast<DataChannelConnection *>(addr);
  int res;

#ifdef PR_LOGGING
  if (PR_LOG_TEST(GetSCTPLog(), PR_LOG_DEBUG)) {
    char *buf;

    if ((buf = usrsctp_dumppacket(buffer, length, SCTP_DUMP_OUTBOUND)) != NULL) {
      PR_LogPrint("%s", buf);
      usrsctp_freedumpbuffer(buf);
    }
  }
#endif
  // We're async proxying even if on the STSThread because this is called
  // with internal SCTP locks held in some cases (such as in usrsctp_connect()).
  // SCTP has an option for Apple, on IP connections only, to release at least
  // one of the locks before calling a packet output routine; with changes to
  // the underlying SCTP stack this might remove the need to use an async proxy.
  if (0 /*peer->IsSTSThread()*/) {
    res = peer->SendPacket(static_cast<unsigned char *>(buffer), length, false);
  } else {
    unsigned char *data = new unsigned char[length];
    memcpy(data, buffer, length);
    res = -1;
    // XXX It might be worthwhile to add an assertion against the thread
    // somehow getting into the DataChannel/SCTP code again, as
    // DISPATCH_SYNC is not fully blocking.  This may be tricky, as it
    // needs to be a per-thread check, not a global.
    peer->mSTS->Dispatch(WrapRunnable(
                           nsRefPtr<DataChannelConnection>(peer),
                           &DataChannelConnection::SendPacket, data, length, true),
                         NS_DISPATCH_NORMAL);
    res = 0; // cheat!  Packets can always be dropped later anyways
  }
  return res;
}
#endif

#ifdef ALLOW_DIRECT_SCTP_LISTEN_CONNECT
// listen for incoming associations
// Blocks! - Don't call this from main thread!

#error This code will not work as-is since SetEvenOdd() runs on Mainthread

bool
DataChannelConnection::Listen(unsigned short port)
{
  struct sockaddr_in addr;
  socklen_t addr_len;

  NS_WARN_IF_FALSE(!NS_IsMainThread(), "Blocks, do not call from main thread!!!");

  /* Acting as the 'server' */
  memset((void *)&addr, 0, sizeof(addr));
#ifdef HAVE_SIN_LEN
  addr.sin_len = sizeof(struct sockaddr_in);
#endif
  addr.sin_family = AF_INET;
  addr.sin_port = htons(port);
  addr.sin_addr.s_addr = htonl(INADDR_ANY);
  LOG(("Waiting for connections on port %u", ntohs(addr.sin_port)));
  mState = CONNECTING;
  if (usrsctp_bind(mMasterSocket, reinterpret_cast<struct sockaddr *>(&addr), sizeof(struct sockaddr_in)) < 0) {
    LOG(("***Failed userspace_bind"));
    return false;
  }
  if (usrsctp_listen(mMasterSocket, 1) < 0) {
    LOG(("***Failed userspace_listen"));
    return false;
  }

  LOG(("Accepting connection"));
  addr_len = 0;
  if ((mSocket = usrsctp_accept(mMasterSocket, nullptr, &addr_len)) == nullptr) {
    LOG(("***Failed accept"));
    return false;
  }
  mState = OPEN;

  struct linger l;
  l.l_onoff = 1;
  l.l_linger = 0;
  if (usrsctp_setsockopt(mSocket, SOL_SOCKET, SO_LINGER,
                         (const void *)&l, (socklen_t)sizeof(struct linger)) < 0) {
    LOG(("Couldn't set SO_LINGER on SCTP socket"));
  }

  SetEvenOdd();

  // Notify Connection open
  // XXX We need to make sure connection sticks around until the message is delivered
  LOG(("%s: sending ON_CONNECTION for %p", __FUNCTION__, this));
  NS_DispatchToMainThread(new DataChannelOnMessageAvailable(
                            DataChannelOnMessageAvailable::ON_CONNECTION,
                            this, (DataChannel *) nullptr));
  return true;
}

// Blocks! - Don't call this from main thread!
bool
DataChannelConnection::Connect(const char *addr, unsigned short port)
{
  struct sockaddr_in addr4;
  struct sockaddr_in6 addr6;

  NS_WARN_IF_FALSE(!NS_IsMainThread(), "Blocks, do not call from main thread!!!");

  /* Acting as the connector */
  LOG(("Connecting to %s, port %u", addr, port));
  memset((void *)&addr4, 0, sizeof(struct sockaddr_in));
  memset((void *)&addr6, 0, sizeof(struct sockaddr_in6));
#ifdef HAVE_SIN_LEN
  addr4.sin_len = sizeof(struct sockaddr_in);
#endif
#ifdef HAVE_SIN6_LEN
  addr6.sin6_len = sizeof(struct sockaddr_in6);
#endif
  addr4.sin_family = AF_INET;
  addr6.sin6_family = AF_INET6;
  addr4.sin_port = htons(port);
  addr6.sin6_port = htons(port);
  mState = CONNECTING;

#if !defined(__Userspace_os_Windows)
  if (inet_pton(AF_INET6, addr, &addr6.sin6_addr) == 1) {
    if (usrsctp_connect(mMasterSocket, reinterpret_cast<struct sockaddr *>(&addr6), sizeof(struct sockaddr_in6)) < 0) {
      LOG(("*** Failed userspace_connect"));
      return false;
    }
  } else if (inet_pton(AF_INET, addr, &addr4.sin_addr) == 1) {
    if (usrsctp_connect(mMasterSocket, reinterpret_cast<struct sockaddr *>(&addr4), sizeof(struct sockaddr_in)) < 0) {
      LOG(("*** Failed userspace_connect"));
      return false;
    }
  } else {
    LOG(("*** Illegal destination address."));
  }
#else
  {
    struct sockaddr_storage ss;
    int sslen = sizeof(ss);

    if (!WSAStringToAddressA(const_cast<char *>(addr), AF_INET6, nullptr, (struct sockaddr*)&ss, &sslen)) {
      addr6.sin6_addr = (reinterpret_cast<struct sockaddr_in6 *>(&ss))->sin6_addr;
      if (usrsctp_connect(mMasterSocket, reinterpret_cast<struct sockaddr *>(&addr6), sizeof(struct sockaddr_in6)) < 0) {
        LOG(("*** Failed userspace_connect"));
        return false;
      }
    } else if (!WSAStringToAddressA(const_cast<char *>(addr), AF_INET, nullptr, (struct sockaddr*)&ss, &sslen)) {
      addr4.sin_addr = (reinterpret_cast<struct sockaddr_in *>(&ss))->sin_addr;
      if (usrsctp_connect(mMasterSocket, reinterpret_cast<struct sockaddr *>(&addr4), sizeof(struct sockaddr_in)) < 0) {
        LOG(("*** Failed userspace_connect"));
        return false;
      }
    } else {
      LOG(("*** Illegal destination address."));
    }
  }
#endif

  mSocket = mMasterSocket;

  LOG(("connect() succeeded!  Entering connected mode"));
  mState = OPEN;

  SetEvenOdd();

  // Notify Connection open
  // XXX We need to make sure connection sticks around until the message is delivered
  LOG(("%s: sending ON_CONNECTION for %p", __FUNCTION__, this));
  NS_DispatchToMainThread(new DataChannelOnMessageAvailable(
                            DataChannelOnMessageAvailable::ON_CONNECTION,
                            this, (DataChannel *) nullptr));
  return true;
}
#endif

DataChannel *
DataChannelConnection::FindChannelByStream(uint16_t streamOut)
{
  return mStreams.SafeElementAt(streamOut);
}

uint16_t
DataChannelConnection::FindFreeStream()
{
  uint32_t i, j, limit;

  limit = mStreams.Length();
  if (limit > MAX_NUM_STREAMS)
    limit = MAX_NUM_STREAMS;

  for (i = (mAllocateEven ? 0 : 1); i < limit; i += 2) {
    if (!mStreams[i]) {
      // Verify it's not still in the process of closing
      for (j = 0; j < mStreamsResetting.Length(); ++j) {
        if (mStreamsResetting[j] == i) {
          break;
        }
      }
      if (j == mStreamsResetting.Length())
        break;
    }
  }
  if (i >= limit) {
    return INVALID_STREAM;
  }
  return i;
}

bool
DataChannelConnection::RequestMoreStreams(int32_t aNeeded)
{
  struct sctp_status status;
  struct sctp_add_streams sas;
  uint32_t outStreamsNeeded;
  socklen_t len;

  if (aNeeded + mStreams.Length() > MAX_NUM_STREAMS)
    aNeeded = MAX_NUM_STREAMS - mStreams.Length();
  if (aNeeded <= 0)
    return false;

  len = (socklen_t)sizeof(struct sctp_status);
  if (usrsctp_getsockopt(mMasterSocket, IPPROTO_SCTP, SCTP_STATUS, &status, &len) < 0) {
    LOG(("***failed: getsockopt SCTP_STATUS"));
    return false;
  }
  outStreamsNeeded = aNeeded; // number to add

  memset(&sas, 0, sizeof(struct sctp_add_streams));
  sas.sas_instrms = 0;
  sas.sas_outstrms = (uint16_t)outStreamsNeeded; /* XXX error handling */
  // Doesn't block, we get an event when it succeeds or fails
  if (usrsctp_setsockopt(mMasterSocket, IPPROTO_SCTP, SCTP_ADD_STREAMS, &sas,
                         (socklen_t) sizeof(struct sctp_add_streams)) < 0) {
    if (errno == EALREADY)
      return true;

    LOG(("***failed: setsockopt ADD errno=%d", errno));
    return false;
  }
  LOG(("Requested %u more streams", outStreamsNeeded));
  return true;
}

int32_t
DataChannelConnection::SendControlMessage(void *msg, uint32_t len, uint16_t stream)
{
  struct sctp_sndinfo sndinfo;

  // Note: Main-thread IO, but doesn't block
  memset(&sndinfo, 0, sizeof(struct sctp_sndinfo));
  sndinfo.snd_sid = stream;
  sndinfo.snd_ppid = htonl(DATA_CHANNEL_PPID_CONTROL);
  if (usrsctp_sendv(mSocket, msg, len, nullptr, 0,
                    &sndinfo, (socklen_t)sizeof(struct sctp_sndinfo),
                    SCTP_SENDV_SNDINFO, 0) < 0) {
    //LOG(("***failed: sctp_sendv")); don't log because errno is a return!
    return (0);
  }
  return (1);
}

int32_t
DataChannelConnection::SendOpenRequestMessage(const nsACString& label,
                                              const nsACString& protocol,
                                              uint16_t stream, bool unordered,
                                              uint16_t prPolicy, uint32_t prValue)
{
  int label_len = label.Length(); // not including nul
  int proto_len = protocol.Length(); // not including nul
  struct rtcweb_datachannel_open_request *req =
    (struct rtcweb_datachannel_open_request*) moz_xmalloc((sizeof(*req)-1) + label_len + proto_len);
   // careful - request includes 1 char label

  memset(req, 0, sizeof(struct rtcweb_datachannel_open_request));
  req->msg_type = DATA_CHANNEL_OPEN_REQUEST;
  switch (prPolicy) {
  case SCTP_PR_SCTP_NONE:
    req->channel_type = DATA_CHANNEL_RELIABLE;
    break;
  case SCTP_PR_SCTP_TTL:
    req->channel_type = DATA_CHANNEL_PARTIAL_RELIABLE_TIMED;
    break;
  case SCTP_PR_SCTP_RTX:
    req->channel_type = DATA_CHANNEL_PARTIAL_RELIABLE_REXMIT;
    break;
  default:
    // FIX! need to set errno!  Or make all these SendXxxx() funcs return 0 or errno!
    moz_free(req);
    return (0);
  }
  if (unordered) {
    // Per the current types, all differ by 0x80 between ordered and unordered
    req->channel_type |= 0x80; // NOTE: be careful if new types are added in the future
  }

  req->reliability_param = htonl(prValue);
  req->priority = htons(0); /* XXX: add support */
  req->label_length = htons(label_len);
  req->protocol_length = htons(proto_len);
  memcpy(&req->label[0], PromiseFlatCString(label).get(), label_len);
  memcpy(&req->label[label_len], PromiseFlatCString(protocol).get(), proto_len);

  // sizeof(*req) already includes +1 byte for label, need nul for both strings
  int32_t result = SendControlMessage(req, (sizeof(*req)-1) + label_len + proto_len, stream);

  moz_free(req);
  return result;
}

// XXX This should use a separate thread (outbound queue) which should
// select() to know when to *try* to send data to the socket again.
// Alternatively, it can use a timeout, but that's guaranteed to be wrong
// (just not sure in what direction).  We could re-implement NSPR's
// PR_POLL_WRITE/etc handling... with a lot of work.

// Better yet, use the SCTP stack's notifications on buffer state to avoid
// filling the SCTP's buffers.

// returns if we're still blocked or not
bool
DataChannelConnection::SendDeferredMessages()
{
  uint32_t i;
  nsRefPtr<DataChannel> channel; // we may null out the refs to this
  bool still_blocked = false;
  bool sent = false;

  // This may block while something is modifying channels, but should not block for IO
  MutexAutoLock lock(mLock);

  // XXX For total fairness, on a still_blocked we'd start next time at the
  // same index.  Sorry, not going to bother for now.
  for (i = 0; i < mStreams.Length(); ++i) {
    channel = mStreams[i];
    if (!channel)
      continue;

    // Only one of these should be set....
    if (channel->mFlags & DATA_CHANNEL_FLAGS_SEND_REQ) {
      if (SendOpenRequestMessage(channel->mLabel, channel->mProtocol,
                                 channel->mStream,
                                 channel->mFlags & DATA_CHANNEL_FLAGS_OUT_OF_ORDER_ALLOWED,
                                 channel->mPrPolicy, channel->mPrValue)) {
        channel->mFlags &= ~DATA_CHANNEL_FLAGS_SEND_REQ;
        sent = true;
      } else {
        if (errno == EAGAIN || errno == EWOULDBLOCK) {
          still_blocked = true;
        } else {
          // Close the channel, inform the user
          mStreams[channel->mStream] = nullptr;
          channel->mState = CLOSED;
          // Don't need to reset; we didn't open it
          NS_DispatchToMainThread(new DataChannelOnMessageAvailable(
                                    DataChannelOnMessageAvailable::ON_CHANNEL_CLOSED, this,
                                    channel));
        }
      }
    }
    if (still_blocked)
      break;

    if (channel->mFlags & DATA_CHANNEL_FLAGS_SEND_DATA) {
      bool failed_send = false;
      int32_t result;

      if (channel->mState == CLOSED || channel->mState == CLOSING) {
        channel->mBufferedData.Clear();
      }
      while (!channel->mBufferedData.IsEmpty() &&
             !failed_send) {
        struct sctp_sendv_spa *spa = channel->mBufferedData[0]->mSpa;
        const char *data           = channel->mBufferedData[0]->mData;
        uint32_t len               = channel->mBufferedData[0]->mLength;

        // SCTP will return EMSGSIZE if the message is bigger than the buffer
        // size (or EAGAIN if there isn't space)
        if ((result = usrsctp_sendv(mSocket, data, len,
                                    nullptr, 0,
                                    (void *)spa, (socklen_t)sizeof(struct sctp_sendv_spa),
                                    SCTP_SENDV_SPA,
                                    0) < 0)) {
          if (errno == EAGAIN || errno == EWOULDBLOCK) {
            // leave queued for resend
            failed_send = true;
            LOG(("queue full again when resending %d bytes (%d)", len, result));
          } else {
            LOG(("error %d re-sending string", errno));
            failed_send = true;
          }
        } else {
          LOG(("Resent buffer of %d bytes (%d)", len, result));
          sent = true;
          channel->mBufferedData.RemoveElementAt(0);
        }
      }
      if (channel->mBufferedData.IsEmpty())
        channel->mFlags &= ~DATA_CHANNEL_FLAGS_SEND_DATA;
      else
        still_blocked = true;
    }
    if (still_blocked)
      break;
  }

  if (!still_blocked) {
    // mDeferTimeout becomes an estimate of how long we need to wait next time we block
    return false;
  }
  // adjust time?  More time for next wait if we didn't send anything, less if did
  // Pretty crude, but better than nothing; just to keep CPU use down
  if (!sent && mDeferTimeout < 50)
    mDeferTimeout++;
  else if (sent && mDeferTimeout > 10)
    mDeferTimeout--;

  return true;
}

void
DataChannelConnection::HandleOpenRequestMessage(const struct rtcweb_datachannel_open_request *req,
                                                size_t length,
                                                uint16_t stream)
{
  nsRefPtr<DataChannel> channel;
  uint32_t prValue;
  uint16_t prPolicy;
  uint32_t flags;

  mLock.AssertCurrentThreadOwns();

  if (length != (sizeof(*req) - 1) + ntohs(req->label_length) + ntohs(req->protocol_length)) {
    LOG(("Inconsistent length: %u, should be %u", length,
         (sizeof(*req) - 1) + ntohs(req->label_length) + ntohs(req->protocol_length)));
    if (length < (sizeof(*req) - 1) + ntohs(req->label_length) + ntohs(req->protocol_length))
      return;
  }

  switch (req->channel_type) {
    case DATA_CHANNEL_RELIABLE:
    case DATA_CHANNEL_RELIABLE_UNORDERED:
      prPolicy = SCTP_PR_SCTP_NONE;
      break;
    case DATA_CHANNEL_PARTIAL_RELIABLE_REXMIT:
    case DATA_CHANNEL_PARTIAL_RELIABLE_REXMIT_UNORDERED:
      prPolicy = SCTP_PR_SCTP_RTX;
      break;
    case DATA_CHANNEL_PARTIAL_RELIABLE_TIMED:
    case DATA_CHANNEL_PARTIAL_RELIABLE_TIMED_UNORDERED:
      prPolicy = SCTP_PR_SCTP_TTL;
      break;
    default:
      /* XXX error handling */
      return;
  }
  prValue = ntohl(req->reliability_param);
  flags = (req->channel_type & 0x80) ? DATA_CHANNEL_FLAGS_OUT_OF_ORDER_ALLOWED : 0;

  if ((channel = FindChannelByStream(stream))) {
    if (!(channel->mFlags & DATA_CHANNEL_FLAGS_EXTERNAL_NEGOTIATED)) {
      LOG(("ERROR: HandleOpenRequestMessage: channel for stream %u is in state %d instead of CLOSED.",
           stream, channel->mState));
     /* XXX: some error handling */
    } else {
      LOG(("Open for externally negotiated channel %u", stream));
      // XXX should also check protocol, maybe label
      if (prPolicy != channel->mPrPolicy ||
          prValue != channel->mPrValue ||
          flags != (channel->mFlags & DATA_CHANNEL_FLAGS_OUT_OF_ORDER_ALLOWED))
      {
        LOG(("WARNING: external negotiation mismatch with OpenRequest:"
             "channel %u, policy %u/%u, value %u/%u, flags %x/%x",
             stream, prPolicy, channel->mPrPolicy,
             prValue, channel->mPrValue, flags, channel->mFlags));
      }
    }
    return;
  }

  nsCString label(nsDependentCSubstring(&req->label[0], ntohs(req->label_length)));
  nsCString protocol(nsDependentCSubstring(&req->label[ntohs(req->label_length)],
                                           ntohs(req->protocol_length)));

  channel = new DataChannel(this,
                            stream,
                            DataChannel::CONNECTING,
                            label,
                            protocol,
                            prPolicy, prValue,
                            flags,
                            nullptr, nullptr);
  mStreams[stream] = channel;

  channel->mState = DataChannel::WAITING_TO_OPEN;

  LOG(("%s: sending ON_CHANNEL_CREATED for %s/%s: %u", __FUNCTION__,
       channel->mLabel.get(), channel->mProtocol.get(), stream));
  NS_DispatchToMainThread(new DataChannelOnMessageAvailable(
                            DataChannelOnMessageAvailable::ON_CHANNEL_CREATED,
                            this, channel));

  LOG(("%s: deferring sending ON_CHANNEL_OPEN for %p", __FUNCTION__, channel.get()));

  // Now process any queued data messages for the channel (which will
  // themselves likely get queued until we leave WAITING_TO_OPEN, plus any
  // more that come in before that happens)
  DeliverQueuedData(stream);
}

void
DataChannelConnection::DeliverQueuedData(uint16_t stream)
{
  mLock.AssertCurrentThreadOwns();

  uint32_t i = 0;
  while (i < mQueuedData.Length()) {
    // Careful! we may modify the array length from within the loop!
    if (mQueuedData[i]->mStream == stream) {
      LOG(("Delivering queued data for stream %u, length %u",
           stream, mQueuedData[i]->mLength));
      // Deliver the queued data
      HandleDataMessage(mQueuedData[i]->mPpid,
                        mQueuedData[i]->mData, mQueuedData[i]->mLength,
                        mQueuedData[i]->mStream);
      mQueuedData.RemoveElementAt(i);
      continue; // don't bump index since we removed the element
    }
    i++;
  }
}

void
DataChannelConnection::HandleUnknownMessage(uint32_t ppid, size_t length, uint16_t stream)
{
  /* XXX: Send an error message? */
  LOG(("unknown DataChannel message received: %u, len %ld on stream %lu", ppid, length, stream));
  // XXX Log to JS error console if possible
}

void
DataChannelConnection::HandleDataMessage(uint32_t ppid,
                                         const void *data, size_t length,
                                         uint16_t stream)
{
  DataChannel *channel;
  const char *buffer = (const char *) data;

  mLock.AssertCurrentThreadOwns();

  channel = FindChannelByStream(stream);

  // XXX A closed channel may trip this... check
  if (!channel) {
    // In the updated 0-RTT open case, the sender can send data immediately
    // after Open, and doesn't set the in-order bit (since we don't have a
    // response or ack).  Also, with external negotiation, data can come in
    // before we're told about the external negotiation.  We need to buffer
    // data until either a) Open comes in, if the ordering get messed up,
    // or b) the app tells us this channel was externally negotiated.  When
    // these occur, we deliver the data.

    // Since this is rare and non-performance, keep a single list of queued
    // data messages to deliver once the channel opens.
    LOG(("Queuing data for stream %u, length %u", stream, length));
    mQueuedData.AppendElement(new QueuedDataMessage(stream, ppid, data, length));
    return;
  }

  // XXX should this be a simple if, no warnings/debugbreaks?
  NS_ENSURE_TRUE_VOID(channel->mState != CLOSED);

  {
    nsAutoCString recvData(buffer, length);
    bool is_binary = true;

    if (ppid == DATA_CHANNEL_PPID_DOMSTRING ||
        ppid == DATA_CHANNEL_PPID_DOMSTRING_LAST) {
      is_binary = false;
    }
    if (is_binary != channel->mIsRecvBinary && !channel->mRecvBuffer.IsEmpty()) {
      NS_WARNING("DataChannel message aborted by fragment type change!");
      channel->mRecvBuffer.Truncate(0);
    }
    channel->mIsRecvBinary = is_binary;

    switch (ppid) {
      case DATA_CHANNEL_PPID_DOMSTRING:
      case DATA_CHANNEL_PPID_BINARY:
        channel->mRecvBuffer += recvData;
        LOG(("DataChannel: Partial %s message of length %lu (total %u) on channel id %u",
             is_binary ? "binary" : "string", length, channel->mRecvBuffer.Length(),
             channel->mStream));
        return; // Not ready to notify application

      case DATA_CHANNEL_PPID_DOMSTRING_LAST:
        LOG(("DataChannel: String message received of length %lu on channel %u",
             length, channel->mStream));
        if (!channel->mRecvBuffer.IsEmpty()) {
          channel->mRecvBuffer += recvData;
          LOG(("%s: sending ON_DATA (string fragmented) for %p", __FUNCTION__, channel));
          channel->SendOrQueue(new DataChannelOnMessageAvailable(
                                 DataChannelOnMessageAvailable::ON_DATA, this,
                                 channel, channel->mRecvBuffer, -1));
          channel->mRecvBuffer.Truncate(0);
          return;
        }
        // else send using recvData normally
        length = -1; // Flag for DOMString

        // WebSockets checks IsUTF8() here; we can try to deliver it
        break;

      case DATA_CHANNEL_PPID_BINARY_LAST:
        LOG(("DataChannel: Received binary message of length %lu on channel id %u",
             length, channel->mStream));
        if (!channel->mRecvBuffer.IsEmpty()) {
          channel->mRecvBuffer += recvData;
          LOG(("%s: sending ON_DATA (binary fragmented) for %p", __FUNCTION__, channel));
          channel->SendOrQueue(new DataChannelOnMessageAvailable(
                                 DataChannelOnMessageAvailable::ON_DATA, this,
                                 channel, channel->mRecvBuffer,
                                 channel->mRecvBuffer.Length()));
          channel->mRecvBuffer.Truncate(0);
          return;
        }
        // else send using recvData normally
        break;

      default:
        NS_ERROR("Unknown data PPID");
        return;
    }
    /* Notify onmessage */
    LOG(("%s: sending ON_DATA for %p", __FUNCTION__, channel));
    channel->SendOrQueue(new DataChannelOnMessageAvailable(
                           DataChannelOnMessageAvailable::ON_DATA, this,
                           channel, recvData, length));
  }
}

// Called with mLock locked!
void
DataChannelConnection::HandleMessage(const void *buffer, size_t length, uint32_t ppid, uint16_t stream)
{
  const struct rtcweb_datachannel_open_request *req;

  mLock.AssertCurrentThreadOwns();

  switch (ppid) {
    case DATA_CHANNEL_PPID_CONTROL:
      // structure includes a possibly-unused char label[1] (in a packed structure)
      NS_ENSURE_TRUE_VOID(length >= sizeof(*req) - 1);

      req = static_cast<const struct rtcweb_datachannel_open_request *>(buffer);
      switch (req->msg_type) {
        case DATA_CHANNEL_OPEN_REQUEST:
          LOG(("length %u, sizeof(*req) = %u", length, sizeof(*req)));
          NS_ENSURE_TRUE_VOID(length >= sizeof(*req));

          HandleOpenRequestMessage(req, length, stream);
          break;
        default:
          HandleUnknownMessage(ppid, length, stream);
          break;
      }
      break;
    case DATA_CHANNEL_PPID_DOMSTRING:
    case DATA_CHANNEL_PPID_DOMSTRING_LAST:
    case DATA_CHANNEL_PPID_BINARY:
    case DATA_CHANNEL_PPID_BINARY_LAST:
      HandleDataMessage(ppid, buffer, length, stream);
      break;
    default:
      LOG(("Message of length %lu, PPID %u on stream %u received.",
           length, ppid, stream));
      break;
  }
}

void
DataChannelConnection::HandleAssociationChangeEvent(const struct sctp_assoc_change *sac)
{
  uint32_t i, n;

  switch (sac->sac_state) {
  case SCTP_COMM_UP:
    LOG(("Association change: SCTP_COMM_UP"));
    if (mState == CONNECTING) {
      mSocket = mMasterSocket;
      mState = OPEN;

      SetEvenOdd();

      NS_DispatchToMainThread(new DataChannelOnMessageAvailable(
                                DataChannelOnMessageAvailable::ON_CONNECTION,
                                this, true));
      LOG(("DTLS connect() succeeded!  Entering connected mode"));

      // Open any streams pending...
      ProcessQueuedOpens();

    } else if (mState == OPEN) {
      LOG(("DataConnection Already OPEN"));
    } else {
      LOG(("Unexpected state: %d", mState));
    }
    break;
  case SCTP_COMM_LOST:
    LOG(("Association change: SCTP_COMM_LOST"));
    // This association is toast, so also close all the channels -- from mainthread!
    NS_DispatchToMainThread(new DataChannelOnMessageAvailable(
                              DataChannelOnMessageAvailable::ON_DISCONNECTED,
                              this));
    break;
  case SCTP_RESTART:
    LOG(("Association change: SCTP_RESTART"));
    break;
  case SCTP_SHUTDOWN_COMP:
    LOG(("Association change: SCTP_SHUTDOWN_COMP"));
    NS_DispatchToMainThread(new DataChannelOnMessageAvailable(
                              DataChannelOnMessageAvailable::ON_DISCONNECTED,
                              this));
    break;
  case SCTP_CANT_STR_ASSOC:
    LOG(("Association change: SCTP_CANT_STR_ASSOC"));
    break;
  default:
    LOG(("Association change: UNKNOWN"));
    break;
  }
  LOG(("Association change: streams (in/out) = (%u/%u)",
       sac->sac_inbound_streams, sac->sac_outbound_streams));

  NS_ENSURE_TRUE_VOID(sac);
  n = sac->sac_length - sizeof(*sac);
  if (((sac->sac_state == SCTP_COMM_UP) ||
        (sac->sac_state == SCTP_RESTART)) && (n > 0)) {
    for (i = 0; i < n; ++i) {
      switch (sac->sac_info[i]) {
      case SCTP_ASSOC_SUPPORTS_PR:
        LOG(("Supports: PR"));
        break;
      case SCTP_ASSOC_SUPPORTS_AUTH:
        LOG(("Supports: AUTH"));
        break;
      case SCTP_ASSOC_SUPPORTS_ASCONF:
        LOG(("Supports: ASCONF"));
        break;
      case SCTP_ASSOC_SUPPORTS_MULTIBUF:
        LOG(("Supports: MULTIBUF"));
        break;
      case SCTP_ASSOC_SUPPORTS_RE_CONFIG:
        LOG(("Supports: RE-CONFIG"));
        break;
      default:
        LOG(("Supports: UNKNOWN(0x%02x)", sac->sac_info[i]));
        break;
      }
    }
  } else if (((sac->sac_state == SCTP_COMM_LOST) ||
              (sac->sac_state == SCTP_CANT_STR_ASSOC)) && (n > 0)) {
    LOG(("Association: ABORT ="));
    for (i = 0; i < n; ++i) {
      LOG((" 0x%02x", sac->sac_info[i]));
    }
  }
  if ((sac->sac_state == SCTP_CANT_STR_ASSOC) ||
      (sac->sac_state == SCTP_SHUTDOWN_COMP) ||
      (sac->sac_state == SCTP_COMM_LOST)) {
    return;
  }
}

void
DataChannelConnection::HandlePeerAddressChangeEvent(const struct sctp_paddr_change *spc)
{
  char addr_buf[INET6_ADDRSTRLEN];
  const char *addr = "";
  struct sockaddr_in *sin;
  struct sockaddr_in6 *sin6;
#if defined(__Userspace_os_Windows)
  DWORD addr_len = INET6_ADDRSTRLEN;
#endif

  switch (spc->spc_aaddr.ss_family) {
  case AF_INET:
    sin = (struct sockaddr_in *)&spc->spc_aaddr;
#if !defined(__Userspace_os_Windows)
    addr = inet_ntop(AF_INET, &sin->sin_addr, addr_buf, INET6_ADDRSTRLEN);
#else
    if (WSAAddressToStringA((LPSOCKADDR)sin, sizeof(sin->sin_addr), nullptr,
                            addr_buf, &addr_len)) {
      return;
    }
#endif
    break;
  case AF_INET6:
    sin6 = (struct sockaddr_in6 *)&spc->spc_aaddr;
#if !defined(__Userspace_os_Windows)
    addr = inet_ntop(AF_INET6, &sin6->sin6_addr, addr_buf, INET6_ADDRSTRLEN);
#else
    if (WSAAddressToStringA((LPSOCKADDR)sin6, sizeof(sin6), nullptr,
                            addr_buf, &addr_len)) {
      return;
    }
#endif
  case AF_CONN:
    addr = "DTLS connection";
    break;
  default:
    break;
  }
  LOG(("Peer address %s is now ", addr));
  switch (spc->spc_state) {
  case SCTP_ADDR_AVAILABLE:
    LOG(("SCTP_ADDR_AVAILABLE"));
    break;
  case SCTP_ADDR_UNREACHABLE:
    LOG(("SCTP_ADDR_UNREACHABLE"));
    break;
  case SCTP_ADDR_REMOVED:
    LOG(("SCTP_ADDR_REMOVED"));
    break;
  case SCTP_ADDR_ADDED:
    LOG(("SCTP_ADDR_ADDED"));
    break;
  case SCTP_ADDR_MADE_PRIM:
    LOG(("SCTP_ADDR_MADE_PRIM"));
    break;
  case SCTP_ADDR_CONFIRMED:
    LOG(("SCTP_ADDR_CONFIRMED"));
    break;
  default:
    LOG(("UNKNOWN"));
    break;
  }
  LOG((" (error = 0x%08x).\n", spc->spc_error));
}

void
DataChannelConnection::HandleRemoteErrorEvent(const struct sctp_remote_error *sre)
{
  size_t i, n;

  n = sre->sre_length - sizeof(struct sctp_remote_error);
  LOG(("Remote Error (error = 0x%04x): ", sre->sre_error));
  for (i = 0; i < n; ++i) {
    LOG((" 0x%02x", sre-> sre_data[i]));
  }
}

void
DataChannelConnection::HandleShutdownEvent(const struct sctp_shutdown_event *sse)
{
  LOG(("Shutdown event."));
  /* XXX: notify all channels. */
  // Attempts to actually send anything will fail
}

void
DataChannelConnection::HandleAdaptationIndication(const struct sctp_adaptation_event *sai)
{
  LOG(("Adaptation indication: %x.", sai-> sai_adaptation_ind));
}

void
DataChannelConnection::HandleSendFailedEvent(const struct sctp_send_failed_event *ssfe)
{
  size_t i, n;

  if (ssfe->ssfe_flags & SCTP_DATA_UNSENT) {
    LOG(("Unsent "));
  }
   if (ssfe->ssfe_flags & SCTP_DATA_SENT) {
    LOG(("Sent "));
  }
  if (ssfe->ssfe_flags & ~(SCTP_DATA_SENT | SCTP_DATA_UNSENT)) {
    LOG(("(flags = %x) ", ssfe->ssfe_flags));
  }
  LOG(("message with PPID = %u, SID = %d, flags: 0x%04x due to error = 0x%08x",
       ntohl(ssfe->ssfe_info.snd_ppid), ssfe->ssfe_info.snd_sid,
       ssfe->ssfe_info.snd_flags, ssfe->ssfe_error));
  n = ssfe->ssfe_length - sizeof(struct sctp_send_failed_event);
  for (i = 0; i < n; ++i) {
    LOG((" 0x%02x", ssfe->ssfe_data[i]));
  }
}

void
DataChannelConnection::ClearResets()
{
  // Clear all pending resets
  if (!mStreamsResetting.IsEmpty()) {
    LOG(("Clearing resets for %d streams", mStreamsResetting.Length()));
  }

  for (uint32_t i = 0; i < mStreamsResetting.Length(); ++i) {
    nsRefPtr<DataChannel> channel;
    channel = FindChannelByStream(mStreamsResetting[i]);
    if (channel) {
      LOG(("Forgetting channel %u (%p) with pending reset",channel->mStream, channel.get()));
      mStreams[channel->mStream] = nullptr;
    }
  }
  mStreamsResetting.Clear();
}

void
DataChannelConnection::ResetOutgoingStream(uint16_t streamOut)
{
  uint32_t i;

  mLock.AssertCurrentThreadOwns();
  LOG(("Connection %p: Resetting outgoing stream %u",
       (void *) this, streamOut));
  // Rarely has more than a couple items and only for a short time
  for (i = 0; i < mStreamsResetting.Length(); ++i) {
    if (mStreamsResetting[i] == streamOut) {
      return;
    }
  }
  mStreamsResetting.AppendElement(streamOut);
}

void
DataChannelConnection::SendOutgoingStreamReset()
{
  struct sctp_reset_streams *srs;
  uint32_t i;
  size_t len;

  LOG(("Connection %p: Sending outgoing stream reset for %d streams",
       (void *) this, mStreamsResetting.Length()));
  mLock.AssertCurrentThreadOwns();
  if (mStreamsResetting.IsEmpty()) {
    LOG(("No streams to reset"));
    return;
  }
  len = sizeof(sctp_assoc_t) + (2 + mStreamsResetting.Length()) * sizeof(uint16_t);
  srs = static_cast<struct sctp_reset_streams *> (moz_xmalloc(len)); // infallible malloc
  memset(srs, 0, len);
  srs->srs_flags = SCTP_STREAM_RESET_OUTGOING;
  srs->srs_number_streams = mStreamsResetting.Length();
  for (i = 0; i < mStreamsResetting.Length(); ++i) {
    srs->srs_stream_list[i] = mStreamsResetting[i];
  }
  if (usrsctp_setsockopt(mMasterSocket, IPPROTO_SCTP, SCTP_RESET_STREAMS, srs, (socklen_t)len) < 0) {
    LOG(("***failed: setsockopt RESET, errno %d", errno));
    // if errno == EALREADY, this is normal - we can't send another reset
    // with one pending.
    // When we get an incoming reset (which may be a response to our
    // outstanding one), see if we have any pending outgoing resets and
    // send them
  } else {
    mStreamsResetting.Clear();
  }
  moz_free(srs);
}

void
DataChannelConnection::HandleStreamResetEvent(const struct sctp_stream_reset_event *strrst)
{
  uint32_t n, i;
  nsRefPtr<DataChannel> channel; // since we may null out the ref to the channel

  if (!(strrst->strreset_flags & SCTP_STREAM_RESET_DENIED) &&
      !(strrst->strreset_flags & SCTP_STREAM_RESET_FAILED)) {
    n = (strrst->strreset_length - sizeof(struct sctp_stream_reset_event)) / sizeof(uint16_t);
    for (i = 0; i < n; ++i) {
      if (strrst->strreset_flags & SCTP_STREAM_RESET_INCOMING_SSN) {
        channel = FindChannelByStream(strrst->strreset_stream_list[i]);
        if (channel) {
          // The other side closed the channel
          // We could be in three states:
          // 1. Normal state (input and output streams (OPEN)
          //    Notify application, send a RESET in response on our
          //    outbound channel.  Go to CLOSED
          // 2. We sent our own reset (CLOSING); either they crossed on the
          //    wire, or this is a response to our Reset.
          //    Go to CLOSED
          // 3. We've sent a open but haven't gotten a response yet (OPENING)
          //    I believe this is impossible, as we don't have an input stream yet.

          LOG(("Incoming: Channel %u  closed, state %d",
               channel->mStream, channel->mState));
          ASSERT_WEBRTC(channel->mState == DataChannel::OPEN ||
                        channel->mState == DataChannel::CLOSING ||
                        channel->mState == DataChannel::WAITING_TO_OPEN);
          if (channel->mState == DataChannel::OPEN ||
              channel->mState == DataChannel::WAITING_TO_OPEN) {
            ResetOutgoingStream(channel->mStream);
            SendOutgoingStreamReset();
            NS_DispatchToMainThread(new DataChannelOnMessageAvailable(
                                      DataChannelOnMessageAvailable::ON_CHANNEL_CLOSED, this,
                                      channel));
          }
          mStreams[channel->mStream] = nullptr;

          LOG(("Disconnected DataChannel %p from connection %p",
               (void *) channel.get(), (void *) channel->mConnection.get()));
          channel->Destroy();
          // At this point when we leave here, the object is a zombie held alive only by the DOM object
        } else {
          LOG(("Can't find incoming channel %d",i));
        }
      }
    }
  }

  // In case we failed to send a RESET due to having one outstanding, process any pending resets now:
  if (!mStreamsResetting.IsEmpty()) {
    LOG(("Sending %d pending resets", mStreamsResetting.Length()));
    SendOutgoingStreamReset();
  }
}

void
DataChannelConnection::HandleStreamChangeEvent(const struct sctp_stream_change_event *strchg)
{
  uint16_t stream;
  uint32_t i;
  nsRefPtr<DataChannel> channel;

  if (strchg->strchange_flags == SCTP_STREAM_CHANGE_DENIED) {
    LOG(("*** Failed increasing number of streams from %u (%u/%u)",
         mStreams.Length(),
         strchg->strchange_instrms,
         strchg->strchange_outstrms));
    // XXX FIX! notify pending opens of failure
    return;
  } else {
    if (strchg->strchange_instrms > mStreams.Length()) {
      LOG(("Other side increased streamds from %u to %u",
           mStreams.Length(), strchg->strchange_instrms));
    }
    if (strchg->strchange_outstrms > mStreams.Length()) {
      uint16_t old_len = mStreams.Length();
      LOG(("Increasing number of streams from %u to %u - adding %u (in: %u)",
           old_len,
           strchg->strchange_outstrms,
           strchg->strchange_outstrms - old_len,
           strchg->strchange_instrms));
      // make sure both are the same length
      mStreams.AppendElements(strchg->strchange_outstrms - old_len);
      LOG(("New length = %d (was %d)", mStreams.Length(), old_len));
      for (uint32_t i = old_len; i < mStreams.Length(); ++i) {
        mStreams[i] = nullptr;
      }
      // Re-process any channels waiting for streams.
      // Linear search, but we don't increase channels often and
      // the array would only get long in case of an app error normally

      // Make sure we request enough streams if there's a big jump in streams
      // Could make a more complex API for OpenXxxFinish() and avoid this loop
      int32_t num_needed = mPending.GetSize();
      LOG(("%d of %d new streams already needed", num_needed,
           strchg->strchange_outstrms - old_len));
      num_needed -= (strchg->strchange_outstrms - old_len); // number we added
      if (num_needed > 0) {
        if (num_needed < 16)
          num_needed = 16;
        LOG(("Not enough new streams, asking for %d more", num_needed));
        RequestMoreStreams(num_needed);
      }

      ProcessQueuedOpens();
    }
    // else probably not a change in # of streams
  }

  for (i = 0; i < mStreams.Length(); ++i) {
    channel = mStreams[i];
    if (!channel)
      continue;

    if ((channel->mState == CONNECTING) &&
        (channel->mStream == INVALID_STREAM)) {
      if ((strchg->strchange_flags & SCTP_STREAM_CHANGE_DENIED) ||
          (strchg->strchange_flags & SCTP_STREAM_CHANGE_FAILED)) {
        /* XXX: Signal to the other end. */
        channel->mState = CLOSED;
        NS_DispatchToMainThread(new DataChannelOnMessageAvailable(
                                  DataChannelOnMessageAvailable::ON_CHANNEL_CLOSED, this,
                                  channel));
        // maybe fire onError (bug 843625)
      } else {
        stream = FindFreeStream();
        if (stream != INVALID_STREAM) {
          channel->mStream = stream;
          mStreams[stream] = channel;
          channel->mFlags |= DATA_CHANNEL_FLAGS_SEND_REQ;
          /// XXX fix
          StartDefer();
        } else {
          /* We will not find more ... */
          break;
        }
      }
    }
  }
}


// Called with mLock locked!
void
DataChannelConnection::HandleNotification(const union sctp_notification *notif, size_t n)
{
  mLock.AssertCurrentThreadOwns();
  if (notif->sn_header.sn_length != (uint32_t)n) {
    return;
  }
  switch (notif->sn_header.sn_type) {
  case SCTP_ASSOC_CHANGE:
    HandleAssociationChangeEvent(&(notif->sn_assoc_change));
    break;
  case SCTP_PEER_ADDR_CHANGE:
    HandlePeerAddressChangeEvent(&(notif->sn_paddr_change));
    break;
  case SCTP_REMOTE_ERROR:
    HandleRemoteErrorEvent(&(notif->sn_remote_error));
    break;
  case SCTP_SHUTDOWN_EVENT:
    HandleShutdownEvent(&(notif->sn_shutdown_event));
    break;
  case SCTP_ADAPTATION_INDICATION:
    HandleAdaptationIndication(&(notif->sn_adaptation_event));
    break;
  case SCTP_PARTIAL_DELIVERY_EVENT:
    LOG(("SCTP_PARTIAL_DELIVERY_EVENT"));
    break;
  case SCTP_AUTHENTICATION_EVENT:
    LOG(("SCTP_AUTHENTICATION_EVENT"));
    break;
  case SCTP_SENDER_DRY_EVENT:
    //LOG(("SCTP_SENDER_DRY_EVENT"));
    break;
  case SCTP_NOTIFICATIONS_STOPPED_EVENT:
    LOG(("SCTP_NOTIFICATIONS_STOPPED_EVENT"));
    break;
  case SCTP_SEND_FAILED_EVENT:
    HandleSendFailedEvent(&(notif->sn_send_failed_event));
    break;
  case SCTP_STREAM_RESET_EVENT:
    HandleStreamResetEvent(&(notif->sn_strreset_event));
    break;
  case SCTP_ASSOC_RESET_EVENT:
    LOG(("SCTP_ASSOC_RESET_EVENT"));
    break;
  case SCTP_STREAM_CHANGE_EVENT:
    HandleStreamChangeEvent(&(notif->sn_strchange_event));
    break;
  default:
    LOG(("unknown SCTP event: %u", (uint32_t)notif->sn_header.sn_type));
    break;
   }
 }

int
DataChannelConnection::ReceiveCallback(struct socket* sock, void *data, size_t datalen,
                                       struct sctp_rcvinfo rcv, int32_t flags)
{
  ASSERT_WEBRTC(!NS_IsMainThread());

  if (!data) {
    usrsctp_close(sock); // SCTP has finished shutting down
  } else {
    MutexAutoLock lock(mLock);
    if (flags & MSG_NOTIFICATION) {
      HandleNotification(static_cast<union sctp_notification *>(data), datalen);
    } else {
      HandleMessage(data, datalen, ntohl(rcv.rcv_ppid), rcv.rcv_sid);
    }
  }
  // usrsctp defines the callback as returning an int, but doesn't use it
  return 1;
}

already_AddRefed<DataChannel>
DataChannelConnection::Open(const nsACString& label, const nsACString& protocol,
                            Type type, bool inOrder,
                            uint32_t prValue, DataChannelListener *aListener,
                            nsISupports *aContext, bool aExternalNegotiated,
                            uint16_t aStream)
{
  // aStream == INVALID_STREAM to have the protocol allocate
  uint16_t prPolicy = SCTP_PR_SCTP_NONE;
  uint32_t flags;

  LOG(("DC Open: label %s/%s, type %u, inorder %d, prValue %u, listener %p, context %p, external: %s, stream %u",
       PromiseFlatCString(label).get(), PromiseFlatCString(protocol).get(),
       type, inOrder, prValue, aListener, aContext,
       aExternalNegotiated ? "true" : "false", aStream));
  switch (type) {
    case DATA_CHANNEL_RELIABLE:
      prPolicy = SCTP_PR_SCTP_NONE;
      break;
    case DATA_CHANNEL_PARTIAL_RELIABLE_REXMIT:
      prPolicy = SCTP_PR_SCTP_RTX;
      break;
    case DATA_CHANNEL_PARTIAL_RELIABLE_TIMED:
      prPolicy = SCTP_PR_SCTP_TTL;
      break;
  }
  if ((prPolicy == SCTP_PR_SCTP_NONE) && (prValue != 0)) {
    return nullptr;
  }

  // Don't look past currently-negotiated streams
  if (aStream != INVALID_STREAM && aStream < mStreams.Length() && mStreams[aStream]) {
    LOG(("ERROR: external negotiation of already-open channel %u", aStream));
    // XXX How do we indicate this up to the application?  Probably the
    // caller's job, but we may need to return an error code.
    return nullptr;
  }

  flags = !inOrder ? DATA_CHANNEL_FLAGS_OUT_OF_ORDER_ALLOWED : 0;
  nsRefPtr<DataChannel> channel(new DataChannel(this,
                                                aStream,
                                                DataChannel::CONNECTING,
                                                label, protocol,
                                                type, prValue,
                                                flags,
                                                aListener, aContext));
  if (aExternalNegotiated) {
    channel->mFlags |= DATA_CHANNEL_FLAGS_EXTERNAL_NEGOTIATED;
  }

  MutexAutoLock lock(mLock); // OpenFinish assumes this
  return OpenFinish(channel.forget());
}

// Separate routine so we can also call it to finish up from pending opens
already_AddRefed<DataChannel>
DataChannelConnection::OpenFinish(already_AddRefed<DataChannel> aChannel)
{
  nsRefPtr<DataChannel> channel(aChannel); // takes the reference passed in
  // Normally 1 reference if called from ::Open(), or 2 if called from
  // ProcessQueuedOpens() unless the DOMDataChannel was gc'd
  uint16_t stream = channel->mStream;
  bool queue = false;

  mLock.AssertCurrentThreadOwns();

  // Cases we care about:
  // Pre-negotiated:
  //    Not Open:
  //      Doesn't fit:
  //         -> change initial ask or renegotiate after open
  //      -> queue open
  //    Open:
  //      Doesn't fit:
  //         -> RequestMoreStreams && queue
  //      Does fit:
  //         -> open
  // Not negotiated:
  //    Not Open:
  //      -> queue open
  //    Open:
  //      -> Try to get a stream
  //      Doesn't fit:
  //         -> RequestMoreStreams && queue
  //      Does fit:
  //         -> open
  // So the Open cases are basically the same
  // Not Open cases are simply queue for non-negotiated, and
  // either change the initial ask or possibly renegotiate after open.

  if (mState == OPEN) {
    if (stream == INVALID_STREAM) {
      stream = FindFreeStream(); // may be INVALID_STREAM if we need more
    }
    if (stream == INVALID_STREAM || stream >= mStreams.Length()) {
      // RequestMoreStreams() limits to MAX_NUM_STREAMS -- allocate extra streams
      // to avoid going back immediately for more if the ask to N, N+1, etc
      int32_t more_needed = (stream == INVALID_STREAM) ? 16 :
                            (stream-((int32_t)mStreams.Length())) + 16;
      if (!RequestMoreStreams(more_needed)) {
        // Something bad happened... we're done
        goto request_error_cleanup;
      }
      queue = true;
    }
  } else {
    // not OPEN
    if (stream != INVALID_STREAM && stream >= mStreams.Length() &&
        mState == CLOSED) {
      // Update number of streams for init message
      struct sctp_initmsg initmsg;
      socklen_t len = sizeof(initmsg);
      int32_t total_needed = stream+16;

      memset(&initmsg, 0, sizeof(initmsg));
      if (usrsctp_getsockopt(mMasterSocket, IPPROTO_SCTP, SCTP_INITMSG, &initmsg, &len) < 0) {
        LOG(("*** failed getsockopt SCTP_INITMSG"));
        goto request_error_cleanup;
      }
      LOG(("Setting number of SCTP streams to %u, was %u/%u", total_needed,
           initmsg.sinit_num_ostreams, initmsg.sinit_max_instreams));
      initmsg.sinit_num_ostreams  = total_needed;
      initmsg.sinit_max_instreams = MAX_NUM_STREAMS;
      if (usrsctp_setsockopt(mMasterSocket, IPPROTO_SCTP, SCTP_INITMSG, &initmsg,
                             (socklen_t)sizeof(initmsg)) < 0) {
        LOG(("*** failed setsockopt SCTP_INITMSG, errno %d", errno));
        goto request_error_cleanup;
      }

      int32_t old_len = mStreams.Length();
      mStreams.AppendElements(total_needed - old_len);
      for (int32_t i = old_len; i < total_needed; ++i) {
        mStreams[i] = nullptr;
      }
    }
    // else if state is CONNECTING, we'll just re-negotiate when OpenFinish
    // is called, if needed
    queue = true;
  }
  if (queue) {
    LOG(("Queuing channel %p (%u) to finish open", channel.get(), stream));
    // Also serves to mark we told the app
    channel->mFlags |= DATA_CHANNEL_FLAGS_FINISH_OPEN;
    channel->AddRef(); // we need a ref for the nsDeQue and one to return
    mPending.Push(channel);
    return channel.forget();
  }

  MOZ_ASSERT(stream != INVALID_STREAM);
  // just allocated (& OPEN), or externally negotiated
  mStreams[stream] = channel; // holds a reference
  channel->mStream = stream;

#ifdef TEST_QUEUED_DATA
  // It's painful to write a test for this...
  channel->mState = OPEN;
  channel->mReady = true;
  SendMsgInternal(channel, "Help me!", 8, DATA_CHANNEL_PPID_DOMSTRING_LAST);
#endif

  if (!(channel->mFlags & DATA_CHANNEL_FLAGS_EXTERNAL_NEGOTIATED)) {
    if (!SendOpenRequestMessage(channel->mLabel, channel->mProtocol,
                                stream,
                                !!(channel->mFlags & DATA_CHANNEL_FLAGS_OUT_OF_ORDER_ALLOWED),
                                channel->mPrPolicy, channel->mPrValue)) {
      LOG(("SendOpenRequest failed, errno = %d", errno));
      if (errno == EAGAIN || errno == EWOULDBLOCK) {
        channel->mFlags |= DATA_CHANNEL_FLAGS_SEND_REQ;
        StartDefer();

        return channel.forget();
      } else {
        if (channel->mFlags & DATA_CHANNEL_FLAGS_FINISH_OPEN) {
          // We already returned the channel to the app.
          NS_ERROR("Failed to send open request");
          NS_DispatchToMainThread(new DataChannelOnMessageAvailable(
                                    DataChannelOnMessageAvailable::ON_CHANNEL_CLOSED, this,
                                    channel));
        }
        // If we haven't returned the channel yet, it will get destroyed when we exit
        // this function.
        mStreams[stream] = nullptr;
        channel->mStream = INVALID_STREAM;
        // we'll be destroying the channel
        channel->mState = CLOSED;
        return nullptr;
      }
      /* NOTREACHED */
    }
  }
  // Either externally negotiated or we sent Open
  channel->mState = OPEN;
  channel->mReady = true;
  // FIX?  Move into DOMDataChannel?  I don't think we can send it yet here
  LOG(("%s: sending ON_CHANNEL_OPEN for %p", __FUNCTION__, channel.get()));
  NS_DispatchToMainThread(new DataChannelOnMessageAvailable(
                            DataChannelOnMessageAvailable::ON_CHANNEL_OPEN, this,
                            channel));

  return channel.forget();

request_error_cleanup:
  channel->mState = CLOSED;
  if (channel->mFlags & DATA_CHANNEL_FLAGS_FINISH_OPEN) {
    // We already returned the channel to the app.
    NS_ERROR("Failed to request more streams");
    NS_DispatchToMainThread(new DataChannelOnMessageAvailable(
                              DataChannelOnMessageAvailable::ON_CHANNEL_CLOSED, this,
                              channel));
    return channel.forget();
  }
  // we'll be destroying the channel, but it never really got set up
  // Alternative would be to RUN_ON_THREAD(channel.forget(),::Destroy,...) and
  // Dispatch it to ourselves
  return nullptr;
}

int32_t
DataChannelConnection::SendMsgInternal(DataChannel *channel, const char *data,
                                       uint32_t length, uint32_t ppid)
{
  uint16_t flags;
  struct sctp_sendv_spa spa;
  int32_t result;

  NS_ENSURE_TRUE(channel->mState == OPEN || channel->mState == CONNECTING, 0);
  NS_WARN_IF_FALSE(length > 0, "Length is 0?!");

  flags = (channel->mFlags & DATA_CHANNEL_FLAGS_OUT_OF_ORDER_ALLOWED) ? SCTP_UNORDERED : 0;

  // To avoid problems where an in-order OPEN_RESPONSE is lost and an
  // out-of-order data message "beats" it, require data to be in-order
  // until we get an ACK.
  if (channel->mState == CONNECTING) {
    flags &= ~SCTP_UNORDERED;
  }
  spa.sendv_sndinfo.snd_ppid = htonl(ppid);
  spa.sendv_sndinfo.snd_sid = channel->mStream;
  spa.sendv_sndinfo.snd_flags = flags;
  spa.sendv_sndinfo.snd_context = 0;
  spa.sendv_sndinfo.snd_assoc_id = 0;
  spa.sendv_flags = SCTP_SEND_SNDINFO_VALID;

  if (channel->mPrPolicy != SCTP_PR_SCTP_NONE) {
    spa.sendv_prinfo.pr_policy = channel->mPrPolicy;
    spa.sendv_prinfo.pr_value = channel->mPrValue;
    spa.sendv_flags |= SCTP_SEND_PRINFO_VALID;
  }

  // Note: Main-thread IO, but doesn't block!
  // XXX FIX!  to deal with heavy overruns of JS trying to pass data in
  // (more than the buffersize) queue data onto another thread to do the
  // actual sends.  See netwerk/protocol/websocket/WebSocketChannel.cpp

  // SCTP will return EMSGSIZE if the message is bigger than the buffer
  // size (or EAGAIN if there isn't space)
  if (channel->mBufferedData.IsEmpty()) {
    result = usrsctp_sendv(mSocket, data, length,
                           nullptr, 0,
                           (void *)&spa, (socklen_t)sizeof(struct sctp_sendv_spa),
                           SCTP_SENDV_SPA, 0);
    LOG(("Sent buffer (len=%u), result=%d", length, result));
  } else {
    // Fake EAGAIN if we're already buffering data
    result = -1;
    errno = EAGAIN;
  }
  if (result < 0) {
    if (errno == EAGAIN || errno == EWOULDBLOCK) {
      // queue data for resend!  And queue any further data for the stream until it is...
      BufferedMsg *buffered = new BufferedMsg(spa, data, length); // infallible malloc
      channel->mBufferedData.AppendElement(buffered); // owned by mBufferedData array
      channel->mFlags |= DATA_CHANNEL_FLAGS_SEND_DATA;
      LOG(("Queued %u buffers (len=%u)", channel->mBufferedData.Length(), length));
      StartDefer();
      return 0;
    }
    LOG(("error %d sending string", errno));
  }
  return result;
}

// Handles fragmenting binary messages
int32_t
DataChannelConnection::SendBinary(DataChannel *channel, const char *data,
                                  uint32_t len,
                                  uint32_t ppid_partial, uint32_t ppid_final)
{
  // Since there's a limit on network buffer size and no limits on message
  // size, and we don't want to use EOR mode (multiple writes for a
  // message, but all other streams are blocked until you finish sending
  // this message), we need to add application-level fragmentation of large
  // messages.  On a reliable channel, these can be simply rebuilt into a
  // large message.  On an unreliable channel, we can't and don't know how
  // long to wait, and there are no retransmissions, and no easy way to
  // tell the user "this part is missing", so on unreliable channels we
  // need to return an error if sending more bytes than the network buffers
  // can hold, and perhaps a lower number.

  // We *really* don't want to do this from main thread! - and SendMsgInternal
  // avoids blocking.
  // This MUST be reliable and in-order for the reassembly to work
  if (len > DATA_CHANNEL_MAX_BINARY_FRAGMENT &&
      channel->mPrPolicy == DATA_CHANNEL_RELIABLE &&
      !(channel->mFlags & DATA_CHANNEL_FLAGS_OUT_OF_ORDER_ALLOWED)) {
    int32_t sent=0;
    uint32_t origlen = len;
    LOG(("Sending binary message length %u in chunks", len));
    // XXX check flags for out-of-order, or force in-order for large binary messages
    while (len > 0) {
      uint32_t sendlen = PR_MIN(len, DATA_CHANNEL_MAX_BINARY_FRAGMENT);
      uint32_t ppid;
      len -= sendlen;
      ppid = len > 0 ? ppid_partial : ppid_final;
      LOG(("Send chunk of %u bytes, ppid %u", sendlen, ppid));
      // Note that these might end up being deferred and queued.
      sent += SendMsgInternal(channel, data, sendlen, ppid);
      data += sendlen;
    }
    LOG(("Sent %d buffers for %u bytes, %d sent immediately, %d buffers queued",
         (origlen+DATA_CHANNEL_MAX_BINARY_FRAGMENT-1)/DATA_CHANNEL_MAX_BINARY_FRAGMENT,
         origlen, sent,
         channel->mBufferedData.Length()));
    return sent;
  }
  NS_WARN_IF_FALSE(len <= DATA_CHANNEL_MAX_BINARY_FRAGMENT,
                   "Sending too-large data on unreliable channel!");

  // This will fail if the message is too large (default 256K)
  return SendMsgInternal(channel, data, len, ppid_final);
}

int32_t
DataChannelConnection::SendBlob(uint16_t stream, nsIInputStream *aBlob)
{
  DataChannel *channel = mStreams[stream];
  NS_ENSURE_TRUE(channel, 0);
  // Spawn a thread to send the data

  LOG(("Sending blob to stream %u", stream));

  // XXX to do this safely, we must enqueue these atomically onto the
  // output socket.  We need a sender thread(s?) to enque data into the
  // socket and to avoid main-thread IO that might block.  Even on a
  // background thread, we may not want to block on one stream's data.
  // I.e. run non-blocking and service multiple channels.

  // For now as a hack, send as a single blast of queued packets which may
  // be deferred until buffer space is available.
  nsAutoPtr<nsCString> temp(new nsCString());
  uint64_t len;
  aBlob->Available(&len);
  nsresult rv = NS_ReadInputStreamToString(aBlob, *temp, len);

  NS_ENSURE_SUCCESS(rv, 0);

  aBlob->Close();
  //aBlob->Release(); We didn't AddRef() the way WebSocket does in OutboundMessage (yet)

  // Consider if it makes sense to split the message ourselves for
  // transmission, at least on RELIABLE channels.  Sending large blobs via
  // unreliable channels requires some level of application involvement, OR
  // sending them at big, single messages, which if large will probably not
  // get through.

  // XXX For now, send as one large binary message.  We should also signal
  // (via PPID) that it's a blob.
  const char *data = temp.get()->BeginReading();
  len              = temp.get()->Length();

  return SendBinary(channel, data, len,
                    DATA_CHANNEL_PPID_BINARY, DATA_CHANNEL_PPID_BINARY_LAST);
}

int32_t
DataChannelConnection::SendMsgCommon(uint16_t stream, const nsACString &aMsg,
                                     bool isBinary)
{
  ASSERT_WEBRTC(NS_IsMainThread());
  // We really could allow this from other threads, so long as we deal with
  // asynchronosity issues with channels closing, in particular access to
  // mStreams, and issues with the association closing (access to mSocket).

  const char *data = aMsg.BeginReading();
  uint32_t len     = aMsg.Length();
  DataChannel *channel;

  LOG(("Sending %sto stream %u: %u bytes", isBinary ? "binary " : "", stream, len));
  // XXX if we want more efficiency, translate flags once at open time
  channel = mStreams[stream];
  NS_ENSURE_TRUE(channel, 0);

  if (isBinary)
    return SendBinary(channel, data, len,
                      DATA_CHANNEL_PPID_BINARY, DATA_CHANNEL_PPID_BINARY_LAST);
  return SendBinary(channel, data, len,
                    DATA_CHANNEL_PPID_DOMSTRING, DATA_CHANNEL_PPID_DOMSTRING_LAST);
}

void
DataChannelConnection::Close(DataChannel *aChannel)
{
  MutexAutoLock lock(mLock);
  CloseInt(aChannel);
}

// So we can call Close() with the lock already held
// Called from someone who holds a ref via ::Close(), or from ~DataChannel
void
DataChannelConnection::CloseInt(DataChannel *aChannel)
{
  MOZ_ASSERT(aChannel);
  nsRefPtr<DataChannel> channel(aChannel); // make sure it doesn't go away on us

  mLock.AssertCurrentThreadOwns();
  LOG(("Connection %p/Channel %p: Closing stream %u",
       channel->mConnection.get(), channel.get(), channel->mStream));
  // re-test since it may have closed before the lock was grabbed
  if (aChannel->mState == CLOSED || aChannel->mState == CLOSING) {
    LOG(("Channel already closing/closed (%u)", aChannel->mState));
    if (mState == CLOSED && channel->mStream != INVALID_STREAM) {
      // called from CloseAll()
      // we're not going to hang around waiting any more
      mStreams[channel->mStream] = nullptr;
    }
    return;
  }
  aChannel->mBufferedData.Clear();
  if (channel->mStream != INVALID_STREAM) {
    ResetOutgoingStream(channel->mStream);
    if (mState == CLOSED) { // called from CloseAll()
      // Let resets accumulate then send all at once in CloseAll()
      // we're not going to hang around waiting
      mStreams[channel->mStream] = nullptr;
    } else {
      SendOutgoingStreamReset();
    }
  }
  aChannel->mState = CLOSING;
  if (mState == CLOSED) {
    // we're not going to hang around waiting
    channel->Destroy();
  }
  // At this point when we leave here, the object is a zombie held alive only by the DOM object
}

void DataChannelConnection::CloseAll()
{
  LOG(("Closing all channels (connection %p)", (void*) this));
  // Don't need to lock here

  // Make sure no more channels will be opened
  {
    MutexAutoLock lock(mLock);
    mState = CLOSED;
  }

  // Close current channels
  // If there are runnables, they hold a strong ref and keep the channel
  // and/or connection alive (even if in a CLOSED state)
  bool closed_some = false;
  for (uint32_t i = 0; i < mStreams.Length(); ++i) {
    if (mStreams[i]) {
      mStreams[i]->Close();
      closed_some = true;
    }
  }

  // Clean up any pending opens for channels
  nsRefPtr<DataChannel> channel;
  while (nullptr != (channel = dont_AddRef(static_cast<DataChannel *>(mPending.PopFront())))) {
    LOG(("closing pending channel %p, stream %u", channel.get(), channel->mStream));
    channel->Close(); // also releases the ref on each iteration
    closed_some = true;
  }
  // It's more efficient to let the Resets queue in shutdown and then
  // SendOutgoingStreamReset() here.
  if (closed_some) {
    MutexAutoLock lock(mLock);
    SendOutgoingStreamReset();
  }
}

DataChannel::~DataChannel()
{
  // NS_ASSERTION since this is more "I think I caught all the cases that
  // can cause this" than a true kill-the-program assertion.  If this is
  // wrong, nothing bad happens.  A worst it's a leak.
  NS_ASSERTION(mState == CLOSED || mState == CLOSING, "unexpected state in ~DataChannel");
}

void
DataChannel::Close()
{
  ENSURE_DATACONNECTION;
  mConnection->Close(this);
}

// Used when disconnecting from the DataChannelConnection
void
DataChannel::Destroy()
{
  ENSURE_DATACONNECTION;

  LOG(("Destroying Data channel %u", mStream));
  MOZ_ASSERT_IF(mStream != INVALID_STREAM,
                !mConnection->FindChannelByStream(mStream));
  mStream = INVALID_STREAM;
  mState = CLOSED;
  mConnection = nullptr;
}

void
DataChannel::SetListener(DataChannelListener *aListener, nsISupports *aContext)
{
  MutexAutoLock mLock(mListenerLock);
  mContext = aContext;
  mListener = aListener;
}

// May be called from another (i.e. Main) thread!
void
DataChannel::AppReady()
{
  ENSURE_DATACONNECTION;

  MutexAutoLock lock(mConnection->mLock);

  mReady = true;
  if (mState == WAITING_TO_OPEN) {
    mState = OPEN;
    NS_DispatchToMainThread(new DataChannelOnMessageAvailable(
                              DataChannelOnMessageAvailable::ON_CHANNEL_OPEN, mConnection,
                              this));
    for (uint32_t i = 0; i < mQueuedMessages.Length(); ++i) {
      nsCOMPtr<nsIRunnable> runnable = mQueuedMessages[i];
      MOZ_ASSERT(runnable);
      NS_DispatchToMainThread(runnable);
    }
  } else {
    NS_ASSERTION(mQueuedMessages.IsEmpty(), "Shouldn't have queued messages if not WAITING_TO_OPEN");
  }
  mQueuedMessages.Clear();
  mQueuedMessages.Compact();
  // We never use it again...  We could even allocate the array in the odd
  // cases we need it.
}

uint32_t
DataChannel::GetBufferedAmount()
{
  uint32_t buffered = 0;
  for (uint32_t i = 0; i < mBufferedData.Length(); ++i) {
    buffered += mBufferedData[i]->mLength;
  }
  return buffered;
}

// Called with mLock locked!
void
DataChannel::SendOrQueue(DataChannelOnMessageAvailable *aMessage)
{
  if (!mReady &&
      (mState == CONNECTING || mState == WAITING_TO_OPEN)) {
    mQueuedMessages.AppendElement(aMessage);
  } else {
    NS_DispatchToMainThread(aMessage);
  }
}

} // namespace mozilla