The Tor Browser: media/mtransport/nricectx.cpp@97036ab72558 (annotated)

media/mtransport/nricectx.cpp@97036ab72558 (annotated)

media/mtransport/nricectx.cpp

Tue, 06 Jan 2015 21:39:09 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Tue, 06 Jan 2015 21:39:09 +0100
branch: TOR_BUG_9701
changeset 8: 97036ab72558
permissions: -rw-r--r--

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

 /* -*- 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/. */
 // Original author: ekr@rtfm.com
 // Some of this code is cut-and-pasted from nICEr. Copyright is:
 /*
 Copyright (c) 2007, Adobe Systems, Incorporated
 All rights reserved.
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are
 met:
 * Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.
 * Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.
 * Neither the name of Adobe Systems, Network Resonance nor the names of its
   contributors may be used to endorse or promote products derived from
   this software without specific prior written permission.
 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 #include <string>
 #include <vector>
 #include "logging.h"
 #include "nspr.h"
 #include "nss.h"
 #include "pk11pub.h"
 #include "plbase64.h"
 #include "nsCOMPtr.h"
 #include "nsComponentManagerUtils.h"
 #include "nsError.h"
 #include "nsIEventTarget.h"
 #include "nsNetCID.h"
 #include "nsComponentManagerUtils.h"
 #include "nsServiceManagerUtils.h"
 #include "ScopedNSSTypes.h"
 // nICEr includes
 extern "C" {
 #include "nr_api.h"
 #include "registry.h"
 #include "async_timer.h"
 #include "r_crc32.h"
 #include "r_memory.h"
 #include "ice_reg.h"
 #include "ice_util.h"
 #include "transport_addr.h"
 #include "nr_crypto.h"
 #include "nr_socket.h"
 #include "nr_socket_local.h"
 #include "stun_client_ctx.h"
 #include "stun_server_ctx.h"
 #include "ice_codeword.h"
 #include "ice_ctx.h"
 #include "ice_candidate.h"
 #include "ice_handler.h"
 }
 // Local includes
 #include "nricectx.h"
 #include "nricemediastream.h"
 #include "nr_socket_prsock.h"
 #include "nrinterfaceprioritizer.h"
 #include "rlogringbuffer.h"
 namespace mozilla {
 MOZ_MTLOG_MODULE("mtransport")
 const char kNrIceTransportUdp[] = "udp";
 const char kNrIceTransportTcp[] = "tcp";
 static bool initialized = false;
 // Implement NSPR-based crypto algorithms
 static int nr_crypto_nss_random_bytes(UCHAR *buf, int len) {
   ScopedPK11SlotInfo slot(PK11_GetInternalSlot());
   if (!slot)
     return R_INTERNAL;
   SECStatus rv = PK11_GenerateRandomOnSlot(slot, buf, len);
   if (rv != SECSuccess)
     return R_INTERNAL;
   return 0;
 }
 static int nr_crypto_nss_hmac(UCHAR *key, int keyl, UCHAR *buf, int bufl,
                               UCHAR *result) {
   CK_MECHANISM_TYPE mech = CKM_SHA_1_HMAC;
   PK11SlotInfo *slot = 0;
   MOZ_ASSERT(keyl > 0);
   SECItem keyi = { siBuffer, key, static_cast<unsigned int>(keyl)};
   PK11SymKey *skey = 0;
   PK11Context *hmac_ctx = 0;
   SECStatus status;
   unsigned int hmac_len;
   SECItem param = { siBuffer, nullptr, 0 };
   int err = R_INTERNAL;
   slot = PK11_GetInternalKeySlot();
   if (!slot)
     goto abort;
   skey = PK11_ImportSymKey(slot, mech, PK11_OriginUnwrap,
                           CKA_SIGN, &keyi, nullptr);
   if (!skey)
     goto abort;
   hmac_ctx = PK11_CreateContextBySymKey(mech, CKA_SIGN,
                                         skey, &param);
   if (!hmac_ctx)
     goto abort;
   status = PK11_DigestBegin(hmac_ctx);
   if (status != SECSuccess)
     goto abort;
   status = PK11_DigestOp(hmac_ctx, buf, bufl);
   if (status != SECSuccess)
     goto abort;
   status = PK11_DigestFinal(hmac_ctx, result, &hmac_len, 20);
   if (status != SECSuccess)
     goto abort;
   MOZ_ASSERT(hmac_len == 20);
   err = 0;
  abort:
   if(hmac_ctx) PK11_DestroyContext(hmac_ctx, PR_TRUE);
   if (skey) PK11_FreeSymKey(skey);
   if (slot) PK11_FreeSlot(slot);
   return err;
 }
 static int nr_crypto_nss_md5(UCHAR *buf, int bufl, UCHAR *result) {
   int err = R_INTERNAL;
   SECStatus rv;
   const SECHashObject *ho = HASH_GetHashObject(HASH_AlgMD5);
   MOZ_ASSERT(ho);
   if (!ho)
     goto abort;
   MOZ_ASSERT(ho->length == 16);
   rv = HASH_HashBuf(ho->type, result, buf, bufl);
   if (rv != SECSuccess)
     goto abort;
   err = 0;
 abort:
   return err;
 }
 static nr_ice_crypto_vtbl nr_ice_crypto_nss_vtbl = {
   nr_crypto_nss_random_bytes,
   nr_crypto_nss_hmac,
   nr_crypto_nss_md5
 };
 nsresult NrIceStunServer::ToNicerStunStruct(nr_ice_stun_server *server,
                                             const std::string &transport) const {
   int r;
   int transport_int;
   memset(server, 0, sizeof(nr_ice_stun_server));
   if (transport == kNrIceTransportUdp) {
     transport_int = IPPROTO_UDP;
   } else if (transport == kNrIceTransportTcp) {
     transport_int = IPPROTO_TCP;
   } else {
     MOZ_ASSERT(false);
     return NS_ERROR_FAILURE;
   }
   if (has_addr_) {
     r = nr_praddr_to_transport_addr(&addr_, &server->u.addr,
                                     transport_int, 0);
     if (r) {
       return NS_ERROR_FAILURE;
     }
     server->type=NR_ICE_STUN_SERVER_TYPE_ADDR;
   }
   else {
     MOZ_ASSERT(sizeof(server->u.dnsname.host) > host_.size());
     PL_strncpyz(server->u.dnsname.host, host_.c_str(),
                 sizeof(server->u.dnsname.host));
     server->u.dnsname.port = port_;
     server->type=NR_ICE_STUN_SERVER_TYPE_DNSNAME;
   }
   return NS_OK;
 }
 nsresult NrIceTurnServer::ToNicerTurnStruct(nr_ice_turn_server *server) const {
   memset(server, 0, sizeof(nr_ice_turn_server));
   nsresult rv = ToNicerStunStruct(&server->turn_server, transport_);
   if (NS_FAILED(rv))
     return rv;
   if (transport_ == kNrIceTransportUdp) {
     server->transport = IPPROTO_UDP;
   } else if (transport_ == kNrIceTransportTcp) {
     server->transport = IPPROTO_TCP;
   } else {
     MOZ_ASSERT(false);
     return NS_ERROR_FAILURE;
   }
   if (username_.empty())
     return NS_ERROR_INVALID_ARG;
   if (password_.empty())
     return NS_ERROR_INVALID_ARG;
   if (!(server->username=r_strdup(username_.c_str())))
     return NS_ERROR_OUT_OF_MEMORY;
   // TODO(ekr@rtfm.com): handle non-ASCII passwords somehow?
   // STUN requires they be SASLpreped, but we don't know if
   // they are at this point.
   // C++03 23.2.4, Paragraph 1 stipulates that the elements
   // in std::vector must be contiguous, and can therefore be
   // used as input to functions expecting C arrays.
   int r = r_data_create(&server->password,
                         const_cast<UCHAR *>(&password_[0]),
                         password_.size());
   if (r) {
     RFREE(server->username);
     return NS_ERROR_OUT_OF_MEMORY;
   }
   return NS_OK;
 }
 // Handler callbacks
 int NrIceCtx::select_pair(void *obj,nr_ice_media_stream *stream,
                    int component_id, nr_ice_cand_pair **potentials,
                    int potential_ct) {
   MOZ_MTLOG(ML_DEBUG, "select pair called: potential_ct = "
             << potential_ct);
   return 0;
 }
 int NrIceCtx::stream_ready(void *obj, nr_ice_media_stream *stream) {
   MOZ_MTLOG(ML_DEBUG, "stream_ready called");
   // Get the ICE ctx.
   NrIceCtx *ctx = static_cast<NrIceCtx *>(obj);
   RefPtr<NrIceMediaStream> s = ctx->FindStream(stream);
   // Streams which do not exist should never be ready.
   MOZ_ASSERT(s);
   s->Ready();
   return 0;
 }
 int NrIceCtx::stream_failed(void *obj, nr_ice_media_stream *stream) {
   MOZ_MTLOG(ML_DEBUG, "stream_failed called");
   // Get the ICE ctx
   NrIceCtx *ctx = static_cast<NrIceCtx *>(obj);
   RefPtr<NrIceMediaStream> s = ctx->FindStream(stream);
   // Streams which do not exist should never fail.
   MOZ_ASSERT(s);
   ctx->SetConnectionState(ICE_CTX_FAILED);
   s -> SignalFailed(s);
   return 0;
 }
 int NrIceCtx::ice_completed(void *obj, nr_ice_peer_ctx *pctx) {
   MOZ_MTLOG(ML_DEBUG, "ice_completed called");
   // Get the ICE ctx
   NrIceCtx *ctx = static_cast<NrIceCtx *>(obj);
   // This is called even on failed contexts.
   if (ctx->connection_state() != ICE_CTX_FAILED) {
     ctx->SetConnectionState(ICE_CTX_OPEN);
   }
   return 0;
 }
 int NrIceCtx::msg_recvd(void *obj, nr_ice_peer_ctx *pctx,
                         nr_ice_media_stream *stream, int component_id,
                         UCHAR *msg, int len) {
   // Get the ICE ctx
   NrIceCtx *ctx = static_cast<NrIceCtx *>(obj);
   RefPtr<NrIceMediaStream> s = ctx->FindStream(stream);
   // Streams which do not exist should never have packets.
   MOZ_ASSERT(s);
   s->SignalPacketReceived(s, component_id, msg, len);
   return 0;
 }
 void NrIceCtx::trickle_cb(void *arg, nr_ice_ctx *ice_ctx,
                           nr_ice_media_stream *stream,
                           int component_id,
                           nr_ice_candidate *candidate) {
   // Get the ICE ctx
   NrIceCtx *ctx = static_cast<NrIceCtx *>(arg);
   RefPtr<NrIceMediaStream> s = ctx->FindStream(stream);
   // Streams which do not exist shouldn't have candidates.
   MOZ_ASSERT(s);
   // Format the candidate.
   char candidate_str[NR_ICE_MAX_ATTRIBUTE_SIZE];
   int r = nr_ice_format_candidate_attribute(candidate, candidate_str,
                                             sizeof(candidate_str));
   MOZ_ASSERT(!r);
   if (r)
     return;
   MOZ_MTLOG(ML_INFO, "NrIceCtx(" << ctx->name_ << "): trickling candidate "
             << candidate_str);
   s->SignalCandidate(s, candidate_str);
 }
 RefPtr<NrIceCtx> NrIceCtx::Create(const std::string& name,
                                   bool offerer,
                                   bool set_interface_priorities) {
   RefPtr<NrIceCtx> ctx = new NrIceCtx(name, offerer);
   // Initialize the crypto callbacks and logging stuff
   if (!initialized) {
     NR_reg_init(NR_REG_MODE_LOCAL);
     RLogRingBuffer::CreateInstance();
     nr_crypto_vtbl = &nr_ice_crypto_nss_vtbl;
     initialized = true;
     // Set the priorites for candidate type preferences.
     // These numbers come from RFC 5245 S. 4.1.2.2
     NR_reg_set_uchar((char *)NR_ICE_REG_PREF_TYPE_SRV_RFLX, 100);
     NR_reg_set_uchar((char *)NR_ICE_REG_PREF_TYPE_PEER_RFLX, 110);
     NR_reg_set_uchar((char *)NR_ICE_REG_PREF_TYPE_HOST, 126);
     NR_reg_set_uchar((char *)NR_ICE_REG_PREF_TYPE_RELAYED, 5);
     NR_reg_set_uchar((char *)NR_ICE_REG_PREF_TYPE_RELAYED_TCP, 0);
     if (set_interface_priorities) {
       NR_reg_set_uchar((char *)"ice.pref.interface.rl0", 255);
       NR_reg_set_uchar((char *)"ice.pref.interface.wi0", 254);
       NR_reg_set_uchar((char *)"ice.pref.interface.lo0", 253);
       NR_reg_set_uchar((char *)"ice.pref.interface.en1", 252);
       NR_reg_set_uchar((char *)"ice.pref.interface.en0", 251);
       NR_reg_set_uchar((char *)"ice.pref.interface.eth0", 252);
       NR_reg_set_uchar((char *)"ice.pref.interface.eth1", 251);
       NR_reg_set_uchar((char *)"ice.pref.interface.eth2", 249);
       NR_reg_set_uchar((char *)"ice.pref.interface.ppp", 250);
       NR_reg_set_uchar((char *)"ice.pref.interface.ppp0", 249);
       NR_reg_set_uchar((char *)"ice.pref.interface.en2", 248);
       NR_reg_set_uchar((char *)"ice.pref.interface.en3", 247);
       NR_reg_set_uchar((char *)"ice.pref.interface.em0", 251);
       NR_reg_set_uchar((char *)"ice.pref.interface.em1", 252);
       NR_reg_set_uchar((char *)"ice.pref.interface.vmnet0", 240);
       NR_reg_set_uchar((char *)"ice.pref.interface.vmnet1", 241);
       NR_reg_set_uchar((char *)"ice.pref.interface.vmnet3", 239);
       NR_reg_set_uchar((char *)"ice.pref.interface.vmnet4", 238);
       NR_reg_set_uchar((char *)"ice.pref.interface.vmnet5", 237);
       NR_reg_set_uchar((char *)"ice.pref.interface.vmnet6", 236);
       NR_reg_set_uchar((char *)"ice.pref.interface.vmnet7", 235);
       NR_reg_set_uchar((char *)"ice.pref.interface.vmnet8", 234);
       NR_reg_set_uchar((char *)"ice.pref.interface.virbr0", 233);
       NR_reg_set_uchar((char *)"ice.pref.interface.wlan0", 232);
     }
     NR_reg_set_uint4((char *)"stun.client.maximum_transmits",5);
   }
   // Create the ICE context
   int r;
   UINT4 flags = offerer ? NR_ICE_CTX_FLAGS_OFFERER:
       NR_ICE_CTX_FLAGS_ANSWERER;
   flags |= NR_ICE_CTX_FLAGS_AGGRESSIVE_NOMINATION;
   r = nr_ice_ctx_create(const_cast<char *>(name.c_str()), flags,
                         &ctx->ctx_);
   if (r) {
     MOZ_MTLOG(ML_ERROR, "Couldn't create ICE ctx for '" << name << "'");
     return nullptr;
   }
 #ifdef USE_INTERFACE_PRIORITIZER
   nr_interface_prioritizer *prioritizer = CreateInterfacePrioritizer();
   if (!prioritizer) {
     MOZ_MTLOG(PR_LOG_ERROR, "Couldn't create interface prioritizer.");
     return nullptr;
   }
   r = nr_ice_ctx_set_interface_prioritizer(ctx->ctx_, prioritizer);
   if (r) {
     MOZ_MTLOG(PR_LOG_ERROR, "Couldn't set interface prioritizer.");
     return nullptr;
   }
 #endif  // USE_INTERFACE_PRIORITIZER
   if (ctx->generating_trickle()) {
     r = nr_ice_ctx_set_trickle_cb(ctx->ctx_, &NrIceCtx::trickle_cb, ctx);
     if (r) {
       MOZ_MTLOG(ML_ERROR, "Couldn't set trickle cb for '" << name << "'");
       return nullptr;
     }
   }
   // Create the handler objects
   ctx->ice_handler_vtbl_ = new nr_ice_handler_vtbl();
   ctx->ice_handler_vtbl_->select_pair = &NrIceCtx::select_pair;
   ctx->ice_handler_vtbl_->stream_ready = &NrIceCtx::stream_ready;
   ctx->ice_handler_vtbl_->stream_failed = &NrIceCtx::stream_failed;
   ctx->ice_handler_vtbl_->ice_completed = &NrIceCtx::ice_completed;
   ctx->ice_handler_vtbl_->msg_recvd = &NrIceCtx::msg_recvd;
   ctx->ice_handler_ = new nr_ice_handler();
   ctx->ice_handler_->vtbl = ctx->ice_handler_vtbl_;
   ctx->ice_handler_->obj = ctx;
   // Create the peer ctx. Because we do not support parallel forking, we
   // only have one peer ctx.
   std::string peer_name = name + ":default";
   r = nr_ice_peer_ctx_create(ctx->ctx_, ctx->ice_handler_,
                              const_cast<char *>(peer_name.c_str()),
                              &ctx->peer_);
   if (r) {
     MOZ_MTLOG(ML_ERROR, "Couldn't create ICE peer ctx for '" << name << "'");
     return nullptr;
   }
   nsresult rv;
   ctx->sts_target_ = do_GetService(NS_SOCKETTRANSPORTSERVICE_CONTRACTID, &rv);
   if (!NS_SUCCEEDED(rv))
     return nullptr;
   return ctx;
 }
 NrIceCtx::~NrIceCtx() {
   MOZ_MTLOG(ML_DEBUG, "Destroying ICE ctx '" << name_ <<"'");
   nr_ice_peer_ctx_destroy(&peer_);
   nr_ice_ctx_destroy(&ctx_);
   delete ice_handler_vtbl_;
   delete ice_handler_;
 }
 RefPtr<NrIceMediaStream>
 NrIceCtx::CreateStream(const std::string& name, int components) {
   RefPtr<NrIceMediaStream> stream =
     NrIceMediaStream::Create(this, name, components);
   streams_.push_back(stream);
   return stream;
 }
 void NrIceCtx::destroy_peer_ctx() {
   nr_ice_peer_ctx_destroy(&peer_);
 }
 nsresult NrIceCtx::SetControlling(Controlling controlling) {
   peer_->controlling = (controlling == ICE_CONTROLLING)? 1 : 0;
   MOZ_MTLOG(ML_DEBUG, "ICE ctx " << name_ << " setting controlling to" <<
             controlling);
   return NS_OK;
 }
 nsresult NrIceCtx::SetStunServers(const std::vector<NrIceStunServer>&
                                   stun_servers) {
   if (stun_servers.empty())
     return NS_OK;
   ScopedDeleteArray<nr_ice_stun_server> servers(
       new nr_ice_stun_server[stun_servers.size()]);
   for (size_t i=0; i < stun_servers.size(); ++i) {
     nsresult rv = stun_servers[i].ToNicerStunStruct(&servers[i]);
     if (NS_FAILED(rv)) {
       MOZ_MTLOG(ML_ERROR, "Couldn't set STUN server for '" << name_ << "'");
       return NS_ERROR_FAILURE;
     }
   }
   int r = nr_ice_ctx_set_stun_servers(ctx_, servers, stun_servers.size());
   if (r) {
     MOZ_MTLOG(ML_ERROR, "Couldn't set STUN server for '" << name_ << "'");
     return NS_ERROR_FAILURE;
   }
   return NS_OK;
 }
 // TODO(ekr@rtfm.com): This is just SetStunServers with s/Stun/Turn
 // Could we do a template or something?
 nsresult NrIceCtx::SetTurnServers(const std::vector<NrIceTurnServer>&
                                   turn_servers) {
   if (turn_servers.empty())
     return NS_OK;
   ScopedDeleteArray<nr_ice_turn_server> servers(
       new nr_ice_turn_server[turn_servers.size()]);
   for (size_t i=0; i < turn_servers.size(); ++i) {
     nsresult rv = turn_servers[i].ToNicerTurnStruct(&servers[i]);
     if (NS_FAILED(rv)) {
       MOZ_MTLOG(ML_ERROR, "Couldn't set TURN server for '" << name_ << "'");
       return NS_ERROR_FAILURE;
     }
   }
   int r = nr_ice_ctx_set_turn_servers(ctx_, servers, turn_servers.size());
   if (r) {
     MOZ_MTLOG(ML_ERROR, "Couldn't set TURN server for '" << name_ << "'");
     return NS_ERROR_FAILURE;
   }
   // TODO(ekr@rtfm.com): This leaks the username/password. Need to free that.
   return NS_OK;
 }
 nsresult NrIceCtx::SetResolver(nr_resolver *resolver) {
   int r = nr_ice_ctx_set_resolver(ctx_, resolver);
   if (r) {
     MOZ_MTLOG(ML_ERROR, "Couldn't set resolver for '" << name_ << "'");
     return NS_ERROR_FAILURE;
   }
   return NS_OK;
 }
 nsresult NrIceCtx::StartGathering() {
   MOZ_ASSERT(ctx_->state == ICE_CTX_INIT);
   if (ctx_->state != ICE_CTX_INIT) {
     MOZ_MTLOG(ML_ERROR, "ICE ctx in the wrong state for gathering: '"
               << name_ << "'");
     SetConnectionState(ICE_CTX_FAILED);
     return NS_ERROR_FAILURE;
   }
   int r = nr_ice_initialize(ctx_, &NrIceCtx::initialized_cb,
                             this);
   if (r && r != R_WOULDBLOCK) {
       MOZ_MTLOG(ML_ERROR, "Couldn't gather ICE candidates for '"
                 << name_ << "'");
       SetConnectionState(ICE_CTX_FAILED);
       return NS_ERROR_FAILURE;
   }
   SetGatheringState(ICE_CTX_GATHER_STARTED);
   return NS_OK;
 }
 RefPtr<NrIceMediaStream> NrIceCtx::FindStream(
     nr_ice_media_stream *stream) {
   for (size_t i=0; i<streams_.size(); ++i) {
     if (streams_[i]->stream() == stream) {
       return streams_[i];
     }
   }
   return nullptr;
 }
 std::vector<std::string> NrIceCtx::GetGlobalAttributes() {
   char **attrs = 0;
   int attrct;
   int r;
   std::vector<std::string> ret;
   r = nr_ice_get_global_attributes(ctx_, &attrs, &attrct);
   if (r) {
     MOZ_MTLOG(ML_ERROR, "Couldn't get ufrag and password for '"
               << name_ << "'");
     return ret;
   }
   for (int i=0; i<attrct; i++) {
     ret.push_back(std::string(attrs[i]));
     RFREE(attrs[i]);
   }
   RFREE(attrs);
   return ret;
 }
 nsresult NrIceCtx::ParseGlobalAttributes(std::vector<std::string> attrs) {
   std::vector<char *> attrs_in;
   for (size_t i=0; i<attrs.size(); ++i) {
     attrs_in.push_back(const_cast<char *>(attrs[i].c_str()));
   }
   int r = nr_ice_peer_ctx_parse_global_attributes(peer_,
                                                   attrs_in.size() ?
                                                   &attrs_in[0] : nullptr,
                                                   attrs_in.size());
   if (r) {
     MOZ_MTLOG(ML_ERROR, "Couldn't parse global attributes for "
               << name_ << "'");
     return NS_ERROR_FAILURE;
   }
   return NS_OK;
 }
 nsresult NrIceCtx::StartChecks() {
   int r;
   r=nr_ice_peer_ctx_pair_candidates(peer_);
   if (r) {
     MOZ_MTLOG(ML_ERROR, "Couldn't pair candidates on "
               << name_ << "'");
     SetConnectionState(ICE_CTX_FAILED);
     return NS_ERROR_FAILURE;
   }
   r = nr_ice_peer_ctx_start_checks2(peer_,1);
   if (r) {
     if (r == R_NOT_FOUND) {
       MOZ_MTLOG(ML_ERROR, "Couldn't start peer checks on "
                 << name_ << "' assuming trickle ICE");
     } else {
       MOZ_MTLOG(ML_ERROR, "Couldn't start peer checks on "
                 << name_ << "'");
       SetConnectionState(ICE_CTX_FAILED);
       return NS_ERROR_FAILURE;
     }
   } else {
     SetConnectionState(ICE_CTX_CHECKING);
   }
   return NS_OK;
 }
 void NrIceCtx::initialized_cb(NR_SOCKET s, int h, void *arg) {
   NrIceCtx *ctx = static_cast<NrIceCtx *>(arg);
   ctx->SetGatheringState(ICE_CTX_GATHER_COMPLETE);
 }
 nsresult NrIceCtx::Finalize() {
   int r = nr_ice_ctx_finalize(ctx_, peer_);
   if (r) {
     MOZ_MTLOG(ML_ERROR, "Couldn't finalize "
          << name_ << "'");
     return NS_ERROR_FAILURE;
   }
   return NS_OK;
 }
 void NrIceCtx::SetConnectionState(ConnectionState state) {
   if (state == connection_state_)
     return;
   MOZ_MTLOG(ML_INFO, "NrIceCtx(" << name_ << "): state " <<
             connection_state_ << "->" << state);
   connection_state_ = state;
   SignalConnectionStateChange(this, state);
 }
 void NrIceCtx::SetGatheringState(GatheringState state) {
   if (state == gathering_state_)
     return;
   MOZ_MTLOG(ML_DEBUG, "NrIceCtx(" << name_ << "): gathering state " <<
             gathering_state_ << "->" << state);
   gathering_state_ = state;
   SignalGatheringStateChange(this, state);
 }
 }  // close namespace
 // Reimplement nr_ice_compute_codeword to avoid copyright issues
 void nr_ice_compute_codeword(char *buf, int len,char *codeword) {
     UINT4 c;
     r_crc32(buf,len,&c);
     PL_Base64Encode(reinterpret_cast<char*>(&c), 3, codeword);
     codeword[4] = 0;
     return;
 }

The Tor Browser / annotate

media/mtransport/nricectx.cpp@97036ab72558 (annotated)

media/mtransport/nricectx.cpp