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 /* -*- 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/. */

 /*

 Modified version of nr_socket_local, adapted for NSPR

 */

 /* 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 code from nICEr and nrappkit.

 nICEr copyright:

 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.

 nrappkit copyright:

    Copyright (C) 2001-2003, Network Resonance, Inc.

    Copyright (C) 2006, Network Resonance, Inc.

    All Rights Reserved

    Redistribution and use in source and binary forms, with or without

    modification, are permitted provided that the following conditions

    are met:

    1. Redistributions of source code must retain the above copyright

       notice, this list of conditions and the following disclaimer.

    2. 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.

    3. Neither the name of Network Resonance, Inc. nor the name of any

       contributors to this software 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.

    ekr@rtfm.com  Thu Dec 20 20:14:49 2001

 */

 #include <csi_platform.h>

 #include <stdio.h>

 #include <string.h>

 #include <sys/types.h>

 #include <assert.h>

 #include <errno.h>

 #include "nspr.h"

 #include "prerror.h"

 #include "prio.h"

 #include "prnetdb.h"

 #include "mozilla/net/DNS.h"

 #include "nsCOMPtr.h"

 #include "nsASocketHandler.h"

 #include "nsISocketTransportService.h"

 #include "nsNetCID.h"

 #include "nsISupportsImpl.h"

 #include "nsServiceManagerUtils.h"

 #include "nsComponentManagerUtils.h"

 #include "nsXPCOM.h"

 #include "nsXULAppAPI.h"

 #include "runnable_utils.h"

 extern "C" {

 #include "nr_api.h"

 #include "async_wait.h"

 #include "nr_socket.h"

 #include "nr_socket_local.h"

 #include "stun_hint.h"

 }

 #include "nr_socket_prsock.h"

 #include "simpletokenbucket.h"

 // Implement the nsISupports ref counting

 namespace mozilla {

 // NrSocketBase implementation

 // async_event APIs

 int NrSocketBase::async_wait(int how, NR_async_cb cb, void *cb_arg,

                              char *function, int line) {

   uint16_t flag;

   switch (how) {

     case NR_ASYNC_WAIT_READ:

       flag = PR_POLL_READ;

       break;

     case NR_ASYNC_WAIT_WRITE:

       flag = PR_POLL_WRITE;

       break;

     default:

       return R_BAD_ARGS;

   }

   cbs_[how] = cb;

   cb_args_[how] = cb_arg;

   poll_flags_ |= flag;

   return 0;

 }

 int NrSocketBase::cancel(int how) {

   uint16_t flag;

   switch (how) {

     case NR_ASYNC_WAIT_READ:

       flag = PR_POLL_READ;

       break;

     case NR_ASYNC_WAIT_WRITE:

       flag = PR_POLL_WRITE;

       break;

     default:

       return R_BAD_ARGS;

   }

   poll_flags_ &= ~flag;

   return 0;

 }

 void NrSocketBase::fire_callback(int how) {

   // This can't happen unless we are armed because we only set

   // the flags if we are armed

   MOZ_ASSERT(cbs_[how]);

   // Now cancel so that we need to be re-armed. Note that

   // the re-arming probably happens in the callback we are

   // about to fire.

   cancel(how);

   cbs_[how](this, how, cb_args_[how]);

 }

 // NrSocket implementation

 NS_IMPL_ISUPPORTS0(NrSocket)

 // The nsASocket callbacks

 void NrSocket::OnSocketReady(PRFileDesc *fd, int16_t outflags) {

   if (outflags & PR_POLL_READ)

     fire_callback(NR_ASYNC_WAIT_READ);

   if (outflags & PR_POLL_WRITE)

     fire_callback(NR_ASYNC_WAIT_WRITE);

 }

 void NrSocket::OnSocketDetached(PRFileDesc *fd) {

   ;  // TODO: Log?

 }

 void NrSocket::IsLocal(bool *aIsLocal) {

   // TODO(jesup): better check? Does it matter? (likely no)

   *aIsLocal = false;

 }

 // async_event APIs

 int NrSocket::async_wait(int how, NR_async_cb cb, void *cb_arg,

                          char *function, int line) {

   int r = NrSocketBase::async_wait(how, cb, cb_arg, function, line);

   if (!r) {

     mPollFlags = poll_flags();

   }

   return r;

 }

 int NrSocket::cancel(int how) {

   int r = NrSocketBase::cancel(how);

   if (!r) {

     mPollFlags = poll_flags();

   }

   return r;

 }

 // Helper functions for addresses

 static int nr_transport_addr_to_praddr(nr_transport_addr *addr,

   PRNetAddr *naddr)

   {

     int _status;

     memset(naddr, 0, sizeof(*naddr));

     switch(addr->protocol){

       case IPPROTO_TCP:

         break;

       case IPPROTO_UDP:

         break;

       default:

         ABORT(R_BAD_ARGS);

     }

     switch(addr->ip_version){

       case NR_IPV4:

         naddr->inet.family = PR_AF_INET;

         naddr->inet.port = addr->u.addr4.sin_port;

         naddr->inet.ip = addr->u.addr4.sin_addr.s_addr;

         break;

       case NR_IPV6:

 #if 0

         naddr->ipv6.family = PR_AF_INET6;

         naddr->ipv6.port = addr->u.addr6.sin6_port;

 #ifdef LINUX

         memcpy(naddr->ipv6.ip._S6_un._S6_u8,

                &addr->u.addr6.sin6_addr.__in6_u.__u6_addr8, 16);

 #else

         memcpy(naddr->ipv6.ip._S6_un._S6_u8,

                &addr->u.addr6.sin6_addr.__u6_addr.__u6_addr8, 16);

 #endif

 #else

         // TODO: make IPv6 work

         ABORT(R_INTERNAL);

 #endif

         break;

       default:

         ABORT(R_BAD_ARGS);

     }

     _status = 0;

   abort:

     return(_status);

   }

 //XXX schien@mozilla.com: copy from PRNetAddrToNetAddr,

 // should be removed after fix the link error in signaling_unittests

 static int praddr_to_netaddr(const PRNetAddr *prAddr, net::NetAddr *addr)

 {

   int _status;

   switch (prAddr->raw.family) {

     case PR_AF_INET:

       addr->inet.family = AF_INET;

       addr->inet.port = prAddr->inet.port;

       addr->inet.ip = prAddr->inet.ip;

       break;

     case PR_AF_INET6:

       addr->inet6.family = AF_INET6;

       addr->inet6.port = prAddr->ipv6.port;

       addr->inet6.flowinfo = prAddr->ipv6.flowinfo;

       memcpy(&addr->inet6.ip, &prAddr->ipv6.ip, sizeof(addr->inet6.ip.u8));

       addr->inet6.scope_id = prAddr->ipv6.scope_id;

       break;

     default:

       MOZ_ASSERT(false);

       ABORT(R_BAD_ARGS);

   }

   _status = 0;

 abort:

   return(_status);

 }

 static int nr_transport_addr_to_netaddr(nr_transport_addr *addr,

   net::NetAddr *naddr)

 {

   int r, _status;

   PRNetAddr praddr;

   if((r = nr_transport_addr_to_praddr(addr, &praddr))) {

     ABORT(r);

   }

   if((r = praddr_to_netaddr(&praddr, naddr))) {

     ABORT(r);

   }

   _status = 0;

 abort:

   return(_status);

 }

 int nr_netaddr_to_transport_addr(const net::NetAddr *netaddr,

                                  nr_transport_addr *addr, int protocol)

   {

     int _status;

     int r;

     switch(netaddr->raw.family) {

       case AF_INET:

         if ((r = nr_ip4_port_to_transport_addr(ntohl(netaddr->inet.ip),

                                                ntohs(netaddr->inet.port),

                                                protocol, addr)))

           ABORT(r);

         break;

       case AF_INET6:

         ABORT(R_BAD_ARGS);

       default:

         MOZ_ASSERT(false);

         ABORT(R_BAD_ARGS);

     }

     _status=0;

   abort:

     return(_status);

   }

 int nr_praddr_to_transport_addr(const PRNetAddr *praddr,

                                 nr_transport_addr *addr, int protocol,

                                 int keep)

   {

     int _status;

     int r;

     struct sockaddr_in ip4;

     switch(praddr->raw.family) {

       case PR_AF_INET:

         ip4.sin_family = PF_INET;

         ip4.sin_addr.s_addr = praddr->inet.ip;

         ip4.sin_port = praddr->inet.port;

         if ((r = nr_sockaddr_to_transport_addr((sockaddr *)&ip4,

                                                sizeof(ip4),

                                                protocol, keep,

                                                addr)))

           ABORT(r);

         break;

       case PR_AF_INET6:

 #if 0

         r = nr_sockaddr_to_transport_addr((sockaddr *)&praddr->raw,

           sizeof(struct sockaddr_in6),IPPROTO_UDP,keep,addr);

         break;

 #endif

         ABORT(R_BAD_ARGS);

       default:

         MOZ_ASSERT(false);

         ABORT(R_BAD_ARGS);

     }

     _status=0;

  abort:

     return(_status);

   }

 /*

  * nr_transport_addr_get_addrstring_and_port

  * convert nr_transport_addr to IP address string and port number

  */

 int nr_transport_addr_get_addrstring_and_port(nr_transport_addr *addr,

                                               nsACString *host, int32_t *port) {

   int r, _status;

   char addr_string[64];

   // We cannot directly use |nr_transport_addr.as_string| because it contains

   // more than ip address, therefore, we need to explicity convert it

   // from |nr_transport_addr_get_addrstring|.

   if ((r=nr_transport_addr_get_addrstring(addr, addr_string, sizeof(addr_string)))) {

     ABORT(r);

   }

   if ((r=nr_transport_addr_get_port(addr, port))) {

     ABORT(r);

   }

   *host = addr_string;

   _status=0;

 abort:

   return(_status);

 }

 // nr_socket APIs (as member functions)

 int NrSocket::create(nr_transport_addr *addr) {

   int r,_status;

   PRStatus status;

   PRNetAddr naddr;

   nsresult rv;

   nsCOMPtr<nsISocketTransportService> stservice =

       do_GetService(NS_SOCKETTRANSPORTSERVICE_CONTRACTID, &rv);

   if (!NS_SUCCEEDED(rv)) {

     ABORT(R_INTERNAL);

   }

   if((r=nr_transport_addr_to_praddr(addr, &naddr)))

     ABORT(r);

   switch (addr->protocol) {

     case IPPROTO_UDP:

       if (!(fd_ = PR_NewUDPSocket())) {

         r_log(LOG_GENERIC,LOG_CRIT,"Couldn't create socket");

         ABORT(R_INTERNAL);

       }

       break;

     case IPPROTO_TCP:

       if (!(fd_ = PR_NewTCPSocket())) {

         r_log(LOG_GENERIC,LOG_CRIT,"Couldn't create socket");

         ABORT(R_INTERNAL);

       }

       break;

     default:

       ABORT(R_INTERNAL);

   }

   status = PR_Bind(fd_, &naddr);

   if (status != PR_SUCCESS) {

     r_log(LOG_GENERIC,LOG_CRIT,"Couldn't bind socket to address %s",

           addr->as_string);

     ABORT(R_INTERNAL);

   }

   r_log(LOG_GENERIC,LOG_DEBUG,"Creating socket %p with addr %s",

         fd_, addr->as_string);

   nr_transport_addr_copy(&my_addr_,addr);

   /* If we have a wildcard port, patch up the addr */

   if(nr_transport_addr_is_wildcard(addr)){

     status = PR_GetSockName(fd_, &naddr);

     if (status != PR_SUCCESS){

       r_log(LOG_GENERIC, LOG_CRIT, "Couldn't get sock name for socket");

       ABORT(R_INTERNAL);

     }

     if((r=nr_praddr_to_transport_addr(&naddr,&my_addr_,addr->protocol,1)))

       ABORT(r);

   }

   // Set nonblocking

   PRSocketOptionData option;

   option.option = PR_SockOpt_Nonblocking;

   option.value.non_blocking = PR_TRUE;

   status = PR_SetSocketOption(fd_, &option);

   if (status != PR_SUCCESS) {

     r_log(LOG_GENERIC, LOG_CRIT, "Couldn't make socket nonblocking");

     ABORT(R_INTERNAL);

   }

   // Remember our thread.

   ststhread_ = do_QueryInterface(stservice, &rv);

   if (!NS_SUCCEEDED(rv))

     ABORT(R_INTERNAL);

   // Finally, register with the STS

   rv = stservice->AttachSocket(fd_, this);

   if (!NS_SUCCEEDED(rv)) {

     ABORT(R_INTERNAL);

   }

   _status = 0;

 abort:

   return(_status);

 }

 // This should be called on the STS thread.

 int NrSocket::sendto(const void *msg, size_t len,

                      int flags, nr_transport_addr *to) {

   ASSERT_ON_THREAD(ststhread_);

   int r,_status;

   PRNetAddr naddr;

   int32_t status;

   if ((r=nr_transport_addr_to_praddr(to, &naddr)))

     ABORT(r);

   if(fd_==nullptr)

     ABORT(R_EOD);

   if (nr_is_stun_request_message((UCHAR*)msg, len)) {

     // Global rate limiting for stun requests, to mitigate the ice hammer DoS

     // (see http://tools.ietf.org/html/draft-thomson-mmusic-ice-webrtc)

     // Tolerate rate of 8k/sec, for one second.

     static SimpleTokenBucket burst(8192*1, 8192);

     // Tolerate rate of 3.6k/sec over twenty seconds.

     static SimpleTokenBucket sustained(3686*20, 3686);

     // Check number of tokens in each bucket.

     if (burst.getTokens(UINT32_MAX) < len ||

         sustained.getTokens(UINT32_MAX) < len) {

       r_log(LOG_GENERIC, LOG_ERR,

                  "Global rate limit for STUN requests exceeded.");

       MOZ_ASSERT(false,

                  "Global rate limit for STUN requests exceeded. Go bug "

                  "bcampen@mozilla.com if you weren't intentionally spamming "

                  "ICE candidates, or don't know what that means.");

       ABORT(R_WOULDBLOCK);

     }

     // Take len tokens from both buckets.

     // (not threadsafe, but no problem since this is only called from STS)

     burst.getTokens(len);

     sustained.getTokens(len);

   }

   // TODO: Convert flags?

   status = PR_SendTo(fd_, msg, len, flags, &naddr, PR_INTERVAL_NO_WAIT);

   if (status < 0 || (size_t)status != len) {

     if (PR_GetError() == PR_WOULD_BLOCK_ERROR)

       ABORT(R_WOULDBLOCK);

     r_log(LOG_GENERIC, LOG_INFO, "Error in sendto %s", to->as_string);

     ABORT(R_IO_ERROR);

   }

   _status=0;

 abort:

   return(_status);

 }

 int NrSocket::recvfrom(void * buf, size_t maxlen,

                        size_t *len, int flags,

                        nr_transport_addr *from) {

   ASSERT_ON_THREAD(ststhread_);

   int r,_status;

   PRNetAddr nfrom;

   int32_t status;

   status = PR_RecvFrom(fd_, buf, maxlen, flags, &nfrom, PR_INTERVAL_NO_WAIT);

   if (status <= 0) {

     r_log(LOG_GENERIC,LOG_ERR,"Error in recvfrom");

     ABORT(R_IO_ERROR);

   }

   *len=status;

   if((r=nr_praddr_to_transport_addr(&nfrom,from,my_addr_.protocol,0)))

     ABORT(r);

   //r_log(LOG_GENERIC,LOG_DEBUG,"Read %d bytes from %s",*len,addr->as_string);

   _status=0;

 abort:

   return(_status);

 }

 int NrSocket::getaddr(nr_transport_addr *addrp) {

   ASSERT_ON_THREAD(ststhread_);

   return nr_transport_addr_copy(addrp, &my_addr_);

 }

 // Close the socket so that the STS will detach and then kill it

 void NrSocket::close() {

   ASSERT_ON_THREAD(ststhread_);

   mCondition = NS_BASE_STREAM_CLOSED;

 }

 int NrSocket::connect(nr_transport_addr *addr) {

   ASSERT_ON_THREAD(ststhread_);

   int r,_status;

   PRNetAddr naddr;

   int32_t status;

   if ((r=nr_transport_addr_to_praddr(addr, &naddr)))

     ABORT(r);

   if(!fd_)

     ABORT(R_EOD);

   // Note: this just means we tried to connect, not that we

   // are actually live.

   connect_invoked_ = true;

   status = PR_Connect(fd_, &naddr, PR_INTERVAL_NO_WAIT);

   if (status != PR_SUCCESS) {

     if (PR_GetError() == PR_IN_PROGRESS_ERROR)

       ABORT(R_WOULDBLOCK);

     ABORT(R_IO_ERROR);

   }

   _status=0;

 abort:

   return(_status);

 }

 int NrSocket::write(const void *msg, size_t len, size_t *written) {

   ASSERT_ON_THREAD(ststhread_);

   int _status;

   int32_t status;

   if (!connect_invoked_)

     ABORT(R_FAILED);

   status = PR_Write(fd_, msg, len);

   if (status < 0) {

     if (PR_GetError() == PR_WOULD_BLOCK_ERROR)

       ABORT(R_WOULDBLOCK);

     ABORT(R_IO_ERROR);

   }

   *written = status;

   _status=0;

 abort:

   return _status;

 }

 int NrSocket::read(void* buf, size_t maxlen, size_t *len) {

   ASSERT_ON_THREAD(ststhread_);

   int _status;

   int32_t status;

   if (!connect_invoked_)

     ABORT(R_FAILED);

   status = PR_Read(fd_, buf, maxlen);

   if (status < 0) {

     if (PR_GetError() == PR_WOULD_BLOCK_ERROR)

       ABORT(R_WOULDBLOCK);

     ABORT(R_IO_ERROR);

   }

   if (status == 0)

     ABORT(R_EOD);

   *len = (size_t)status;  // Guaranteed to be > 0

   _status = 0;

 abort:

   return(_status);

 }

 // NrSocketIpc Implementation

 NS_IMPL_ISUPPORTS(NrSocketIpc, nsIUDPSocketInternal)

 NrSocketIpc::NrSocketIpc(const nsCOMPtr<nsIEventTarget> &main_thread)

     : err_(false),

       state_(NR_INIT),

       main_thread_(main_thread),

       monitor_("NrSocketIpc") {

 }

 // IUDPSocketInternal interfaces

 // callback while error happened in UDP socket operation

 NS_IMETHODIMP NrSocketIpc::CallListenerError(const nsACString &type,

                                              const nsACString &message,

                                              const nsACString &filename,

                                              uint32_t line_number,

                                              uint32_t column_number) {

   ASSERT_ON_THREAD(main_thread_);

   MOZ_ASSERT(type.EqualsLiteral("onerror"));

   r_log(LOG_GENERIC, LOG_ERR, "UDP socket error:%s at %s:%d:%d",

         message.BeginReading(), filename.BeginReading(),

         line_number, column_number);

   ReentrantMonitorAutoEnter mon(monitor_);

   err_ = true;

   monitor_.NotifyAll();

   return NS_OK;

 }

 // callback while receiving UDP packet

 NS_IMETHODIMP NrSocketIpc::CallListenerReceivedData(const nsACString &type,

                                                     const nsACString &host,

                                                     uint16_t port, uint8_t *data,

                                                     uint32_t data_length) {

   ASSERT_ON_THREAD(main_thread_);

   MOZ_ASSERT(type.EqualsLiteral("ondata"));

   PRNetAddr addr;

   memset(&addr, 0, sizeof(addr));

   {

     ReentrantMonitorAutoEnter mon(monitor_);

     if (PR_SUCCESS != PR_StringToNetAddr(host.BeginReading(), &addr)) {

       err_ = true;

       MOZ_ASSERT(false, "Failed to convert remote host to PRNetAddr");

       return NS_OK;

     }

     // Use PR_IpAddrNull to avoid address being reset to 0.

     if (PR_SUCCESS != PR_SetNetAddr(PR_IpAddrNull, addr.raw.family, port, &addr)) {

       err_ = true;

       MOZ_ASSERT(false, "Failed to set port in PRNetAddr");

       return NS_OK;

     }

   }

   nsAutoPtr<DataBuffer> buf(new DataBuffer(data, data_length));

   RefPtr<nr_udp_message> msg(new nr_udp_message(addr, buf));

   RUN_ON_THREAD(sts_thread_,

                 mozilla::WrapRunnable(nsRefPtr<NrSocketIpc>(this),

                                       &NrSocketIpc::recv_callback_s,

                                       msg),

                 NS_DISPATCH_NORMAL);

   return NS_OK;

 }

 // callback while UDP socket is opened or closed

 NS_IMETHODIMP NrSocketIpc::CallListenerVoid(const nsACString &type) {

   ASSERT_ON_THREAD(main_thread_);

   if (type.EqualsLiteral("onopen")) {

     ReentrantMonitorAutoEnter mon(monitor_);

     uint16_t port;

     if (NS_FAILED(socket_child_->GetLocalPort(&port))) {

       err_ = true;

       MOZ_ASSERT(false, "Failed to get local port");

       return NS_OK;

     }

     nsAutoCString address;

     if(NS_FAILED(socket_child_->GetLocalAddress(address))) {

       err_ = true;

       MOZ_ASSERT(false, "Failed to get local address");

       return NS_OK;

     }

     PRNetAddr praddr;

     if (PR_SUCCESS != PR_InitializeNetAddr(PR_IpAddrAny, port, &praddr)) {

       err_ = true;

       MOZ_ASSERT(false, "Failed to set port in PRNetAddr");

       return NS_OK;

     }

     if (PR_SUCCESS != PR_StringToNetAddr(address.BeginReading(), &praddr)) {

       err_ = true;

       MOZ_ASSERT(false, "Failed to convert local host to PRNetAddr");

       return NS_OK;

     }

     nr_transport_addr expected_addr;

     if(nr_transport_addr_copy(&expected_addr, &my_addr_)) {

       err_ = true;

       MOZ_ASSERT(false, "Failed to copy my_addr_");

     }

     if (nr_praddr_to_transport_addr(&praddr, &my_addr_, IPPROTO_UDP, 1)) {

       err_ = true;

       MOZ_ASSERT(false, "Failed to copy local host to my_addr_");

     }

     if (nr_transport_addr_cmp(&expected_addr, &my_addr_,

                               NR_TRANSPORT_ADDR_CMP_MODE_ADDR)) {

       err_ = true;

       MOZ_ASSERT(false, "Address of opened socket is not expected");

     }

     mon.NotifyAll();

   } else if (type.EqualsLiteral("onclose")) {

     // Already handled in UpdateReadyState, nothing to do here

   } else {

     MOZ_ASSERT(false, "Received unexpected event");

   }

   return NS_OK;

 }

 // callback while UDP packet is sent

 NS_IMETHODIMP NrSocketIpc::CallListenerSent(const nsACString &type,

                                             nsresult result) {

   ASSERT_ON_THREAD(main_thread_);

   MOZ_ASSERT(type.EqualsLiteral("onsent"));

   if (NS_FAILED(result)) {

     ReentrantMonitorAutoEnter mon(monitor_);

     err_ = true;

   }

   return NS_OK;

 }

 // callback for state update after every socket operation

 NS_IMETHODIMP NrSocketIpc::UpdateReadyState(const nsACString &readyState) {

   ASSERT_ON_THREAD(main_thread_);

   ReentrantMonitorAutoEnter mon(monitor_);

   if (readyState.EqualsLiteral("closed")) {

     MOZ_ASSERT(state_ == NR_CONNECTED || state_ == NR_CLOSING);

     state_ = NR_CLOSED;

   }

   return NS_OK;

 }

 // nr_socket public APIs

 int NrSocketIpc::create(nr_transport_addr *addr) {

   ASSERT_ON_THREAD(sts_thread_);

   int r, _status;

   nsresult rv;

   int32_t port;

   nsCString host;

   ReentrantMonitorAutoEnter mon(monitor_);

   if (state_ != NR_INIT) {

     ABORT(R_INTERNAL);

   }

   sts_thread_ = do_GetService(NS_SOCKETTRANSPORTSERVICE_CONTRACTID, &rv);

   if (NS_FAILED(rv)) {

     MOZ_ASSERT(false, "Failed to get STS thread");

     ABORT(R_INTERNAL);

   }

   if ((r=nr_transport_addr_get_addrstring_and_port(addr, &host, &port))) {

     ABORT(r);

   }

   // wildcard address will be resolved at NrSocketIpc::CallListenerVoid

   if ((r=nr_transport_addr_copy(&my_addr_, addr))) {

     ABORT(r);

   }

   state_ = NR_CONNECTING;

   RUN_ON_THREAD(main_thread_,

                 mozilla::WrapRunnable(nsRefPtr<NrSocketIpc>(this),

                                       &NrSocketIpc::create_m,

                                       host, static_cast<uint16_t>(port)),

                 NS_DISPATCH_NORMAL);

   // Wait until socket creation complete.

   mon.Wait();

   if (err_) {

     ABORT(R_INTERNAL);

   }

   state_ = NR_CONNECTED;

   _status = 0;

 abort:

   return(_status);

 }

 int NrSocketIpc::sendto(const void *msg, size_t len, int flags,

                         nr_transport_addr *to) {

   ASSERT_ON_THREAD(sts_thread_);

   ReentrantMonitorAutoEnter mon(monitor_);

   //If send err happened before, simply return the error.

   if (err_) {

     return R_IO_ERROR;

   }

   if (!socket_child_) {

     return R_EOD;

   }

   if (state_ != NR_CONNECTED) {

     return R_INTERNAL;

   }

   int r;

   net::NetAddr addr;

   if ((r=nr_transport_addr_to_netaddr(to, &addr))) {

     return r;

   }

   nsAutoPtr<DataBuffer> buf(new DataBuffer(static_cast<const uint8_t*>(msg), len));

   RUN_ON_THREAD(main_thread_,

                 mozilla::WrapRunnable(nsRefPtr<NrSocketIpc>(this),

                                       &NrSocketIpc::sendto_m,

                                       addr, buf),

                 NS_DISPATCH_NORMAL);

   return 0;

 }

 void NrSocketIpc::close() {

   ASSERT_ON_THREAD(sts_thread_);

   ReentrantMonitorAutoEnter mon(monitor_);

   state_ = NR_CLOSING;

   RUN_ON_THREAD(main_thread_,

                 mozilla::WrapRunnable(nsRefPtr<NrSocketIpc>(this),

                                       &NrSocketIpc::close_m),

                 NS_DISPATCH_NORMAL);

   //remove all enqueued messages

   std::queue<RefPtr<nr_udp_message> > empty;

   std::swap(received_msgs_, empty);

 }

 int NrSocketIpc::recvfrom(void *buf, size_t maxlen, size_t *len, int flags,

                           nr_transport_addr *from) {

   ASSERT_ON_THREAD(sts_thread_);

   ReentrantMonitorAutoEnter mon(monitor_);

   int r, _status;

   uint32_t consumed_len;

   *len = 0;

   if (state_ != NR_CONNECTED) {

     ABORT(R_INTERNAL);

   }

   if (received_msgs_.empty()) {

     ABORT(R_WOULDBLOCK);

   }

   {

     RefPtr<nr_udp_message> msg(received_msgs_.front());

     received_msgs_.pop();

     if ((r=nr_praddr_to_transport_addr(&msg->from, from, IPPROTO_UDP, 0))) {

       err_ = true;

       MOZ_ASSERT(false, "Get bogus address for received UDP packet");

       ABORT(r);

     }

     consumed_len = std::min(maxlen, msg->data->len());

     if (consumed_len < msg->data->len()) {

       r_log(LOG_GENERIC, LOG_DEBUG, "Partial received UDP packet will be discard");

     }

     memcpy(buf, msg->data->data(), consumed_len);

     *len = consumed_len;

   }

   _status = 0;

 abort:

   return(_status);

 }

 int NrSocketIpc::getaddr(nr_transport_addr *addrp) {

   ASSERT_ON_THREAD(sts_thread_);

   ReentrantMonitorAutoEnter mon(monitor_);

   if (state_ != NR_CONNECTED) {

     return R_INTERNAL;

   }

   return nr_transport_addr_copy(addrp, &my_addr_);

 }

 int NrSocketIpc::connect(nr_transport_addr *addr) {

   MOZ_ASSERT(false);

   return R_INTERNAL;

 }

 int NrSocketIpc::write(const void *msg, size_t len, size_t *written) {

   MOZ_ASSERT(false);

   return R_INTERNAL;

 }

 int NrSocketIpc::read(void* buf, size_t maxlen, size_t *len) {

   MOZ_ASSERT(false);

   return R_INTERNAL;

 }

 // Main thread executors

 void NrSocketIpc::create_m(const nsACString &host, const uint16_t port) {

   ASSERT_ON_THREAD(main_thread_);

   ReentrantMonitorAutoEnter mon(monitor_);

   nsresult rv;

   socket_child_ = do_CreateInstance("@mozilla.org/udp-socket-child;1", &rv);

   if (NS_FAILED(rv)) {

     err_ = true;

     MOZ_ASSERT(false, "Failed to create UDPSocketChild");

   }

   socket_child_->SetFilterName(nsCString("stun"));

   if (NS_FAILED(socket_child_->Bind(this, host, port))) {

     err_ = true;

     MOZ_ASSERT(false, "Failed to create UDP socket");

   }

 }

 void NrSocketIpc::sendto_m(const net::NetAddr &addr, nsAutoPtr<DataBuffer> buf) {

   ASSERT_ON_THREAD(main_thread_);

   MOZ_ASSERT(socket_child_);

   ReentrantMonitorAutoEnter mon(monitor_);

   if (NS_FAILED(socket_child_->SendWithAddress(&addr,

                                                buf->data(),

                                                buf->len()))) {

     err_ = true;

   }

 }

 void NrSocketIpc::close_m() {

   ASSERT_ON_THREAD(main_thread_);

   if (socket_child_) {

     socket_child_->Close();

     socket_child_ = nullptr;

   }

 }

 void NrSocketIpc::recv_callback_s(RefPtr<nr_udp_message> msg) {

   ASSERT_ON_THREAD(sts_thread_);

   {

     ReentrantMonitorAutoEnter mon(monitor_);

     if (state_ != NR_CONNECTED) {

       return;

     }

   }

   //enqueue received message

   received_msgs_.push(msg);

   if ((poll_flags() & PR_POLL_READ)) {

     fire_callback(NR_ASYNC_WAIT_READ);

   }

 }

 }  // close namespace

 using namespace mozilla;

 // Bridge to the nr_socket interface

 static int nr_socket_local_destroy(void **objp);

 static int nr_socket_local_sendto(void *obj,const void *msg, size_t len,

                                   int flags, nr_transport_addr *to);

 static int nr_socket_local_recvfrom(void *obj,void * restrict buf,

   size_t maxlen, size_t *len, int flags, nr_transport_addr *from);

 static int nr_socket_local_getfd(void *obj, NR_SOCKET *fd);

 static int nr_socket_local_getaddr(void *obj, nr_transport_addr *addrp);

 static int nr_socket_local_close(void *obj);

 static int nr_socket_local_connect(void *sock, nr_transport_addr *addr);

 static int nr_socket_local_write(void *obj,const void *msg, size_t len,

                                  size_t *written);

 static int nr_socket_local_read(void *obj,void * restrict buf, size_t maxlen,

                                 size_t *len);

 static nr_socket_vtbl nr_socket_local_vtbl={

   1,

   nr_socket_local_destroy,

   nr_socket_local_sendto,

   nr_socket_local_recvfrom,

   nr_socket_local_getfd,

   nr_socket_local_getaddr,

   nr_socket_local_connect,

   nr_socket_local_write,

   nr_socket_local_read,

   nr_socket_local_close

 };

 int nr_socket_local_create(nr_transport_addr *addr, nr_socket **sockp) {

   NrSocketBase *sock = nullptr;

   // create IPC bridge for content process

   if (XRE_GetProcessType() == GeckoProcessType_Default) {

     sock = new NrSocket();

   } else {

     nsCOMPtr<nsIThread> main_thread;

     NS_GetMainThread(getter_AddRefs(main_thread));

     sock = new NrSocketIpc(main_thread.get());

   }

   int r, _status;

   r = sock->create(addr);

   if (r)

     ABORT(r);

   r = nr_socket_create_int(static_cast<void *>(sock),

                            sock->vtbl(), sockp);

   if (r)

     ABORT(r);

   // Add a reference so that we can delete it in destroy()

   sock->AddRef();

   _status = 0;

 abort:

   if (_status) {

     delete sock;

   }

   return _status;

 }

 static int nr_socket_local_destroy(void **objp) {

   if(!objp || !*objp)

     return 0;

   NrSocketBase *sock = static_cast<NrSocketBase *>(*objp);

   *objp=0;

   sock->close();  // Signal STS that we want not to listen

   sock->Release();  // Decrement the ref count

   return 0;

 }

 static int nr_socket_local_sendto(void *obj,const void *msg, size_t len,

                                   int flags, nr_transport_addr *addr) {

   NrSocketBase *sock = static_cast<NrSocketBase *>(obj);

   return sock->sendto(msg, len, flags, addr);

 }

 static int nr_socket_local_recvfrom(void *obj,void * restrict buf,

                                     size_t maxlen, size_t *len, int flags,

                                     nr_transport_addr *addr) {

   NrSocketBase *sock = static_cast<NrSocketBase *>(obj);

   return sock->recvfrom(buf, maxlen, len, flags, addr);

 }

 static int nr_socket_local_getfd(void *obj, NR_SOCKET *fd) {

   NrSocketBase *sock = static_cast<NrSocketBase *>(obj);

   *fd = sock;

   return 0;

 }

 static int nr_socket_local_getaddr(void *obj, nr_transport_addr *addrp) {

   NrSocketBase *sock = static_cast<NrSocketBase *>(obj);

   return sock->getaddr(addrp);

 }

 static int nr_socket_local_close(void *obj) {

   NrSocketBase *sock = static_cast<NrSocketBase *>(obj);

   sock->close();

   return 0;

 }

 static int nr_socket_local_write(void *obj, const void *msg, size_t len,

                                  size_t *written) {

   NrSocket *sock = static_cast<NrSocket *>(obj);

   return sock->write(msg, len, written);

 }

 static int nr_socket_local_read(void *obj, void * restrict buf, size_t maxlen,

                                 size_t *len) {

   NrSocket *sock = static_cast<NrSocket *>(obj);

   return sock->read(buf, maxlen, len);

 }

 static int nr_socket_local_connect(void *obj, nr_transport_addr *addr) {

   NrSocket *sock = static_cast<NrSocket *>(obj);

   return sock->connect(addr);

 }

 // Implement async api

 int NR_async_wait(NR_SOCKET sock, int how, NR_async_cb cb,void *cb_arg,

                   char *function,int line) {

   NrSocketBase *s = static_cast<NrSocketBase *>(sock);

   return s->async_wait(how, cb, cb_arg, function, line);

 }

 int NR_async_cancel(NR_SOCKET sock,int how) {

   NrSocketBase *s = static_cast<NrSocketBase *>(sock);

   return s->cancel(how);

 }

 nr_socket_vtbl* NrSocketBase::vtbl() {

   return &nr_socket_local_vtbl;

 }