The Tor Browser: netwerk/base/src/nsSocketTransport2.cpp@6474c204b198 (annotated)

netwerk/base/src/nsSocketTransport2.cpp@6474c204b198 (annotated)

netwerk/base/src/nsSocketTransport2.cpp

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
 /* vim:set ts=4 sw=4 et cindent: */
 /* 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/. */
 #ifdef MOZ_LOGGING
 #define FORCE_PR_LOG
 #endif
 #include "nsSocketTransport2.h"
 #include "mozilla/Attributes.h"
 #include "nsIOService.h"
 #include "nsStreamUtils.h"
 #include "nsNetSegmentUtils.h"
 #include "nsNetAddr.h"
 #include "nsTransportUtils.h"
 #include "nsProxyInfo.h"
 #include "nsNetCID.h"
 #include "nsNetUtil.h"
 #include "nsAutoPtr.h"
 #include "nsCOMPtr.h"
 #include "plstr.h"
 #include "prerr.h"
 #include "NetworkActivityMonitor.h"
 #include "mozilla/VisualEventTracer.h"
 #include "nsThreadUtils.h"
 #include "nsISocketProviderService.h"
 #include "nsISocketProvider.h"
 #include "nsISSLSocketControl.h"
 #include "nsINSSErrorsService.h"
 #include "nsIPipe.h"
 #include "nsIProgrammingLanguage.h"
 #include "nsIClassInfoImpl.h"
 #include "nsURLHelper.h"
 #include "nsIDNSService.h"
 #include "nsIDNSRecord.h"
 #include "nsICancelable.h"
 #include <algorithm>
 #include "nsPrintfCString.h"
 #if defined(XP_WIN)
 #include "nsNativeConnectionHelper.h"
 #endif
 /* Following inclusions required for keepalive config not supported by NSPR. */
 #include "private/pprio.h"
 #if defined(XP_WIN)
 #include <winsock2.h>
 #include <mstcpip.h>
 #elif defined(XP_UNIX)
 #include <errno.h>
 #include <netinet/tcp.h>
 #endif
 /* End keepalive config inclusions. */
 using namespace mozilla;
 using namespace mozilla::net;
 //-----------------------------------------------------------------------------
 static NS_DEFINE_CID(kSocketProviderServiceCID, NS_SOCKETPROVIDERSERVICE_CID);
 static NS_DEFINE_CID(kDNSServiceCID, NS_DNSSERVICE_CID);
 //-----------------------------------------------------------------------------
 class nsSocketEvent : public nsRunnable
 {
 public:
     nsSocketEvent(nsSocketTransport *transport, uint32_t type,
                   nsresult status = NS_OK, nsISupports *param = nullptr)
         : mTransport(transport)
         , mType(type)
         , mStatus(status)
         , mParam(param)
     {}
     NS_IMETHOD Run()
     {
         mTransport->OnSocketEvent(mType, mStatus, mParam);
         return NS_OK;
     }
 private:
     nsRefPtr<nsSocketTransport> mTransport;
     uint32_t              mType;
     nsresult              mStatus;
     nsCOMPtr<nsISupports> mParam;
 };
 //-----------------------------------------------------------------------------
 //#define TEST_CONNECT_ERRORS
 #ifdef TEST_CONNECT_ERRORS
 #include <stdlib.h>
 static PRErrorCode RandomizeConnectError(PRErrorCode code)
 {
     //
     // To test out these errors, load http://www.yahoo.com/.  It should load
     // correctly despite the random occurrence of these errors.
     //
     int n = rand();
     if (n > RAND_MAX/2) {
         struct {
             PRErrorCode err_code;
             const char *err_name;
         }
         errors[] = {
             //
             // These errors should be recoverable provided there is another
             // IP address in mDNSRecord.
             //
             { PR_CONNECT_REFUSED_ERROR, "PR_CONNECT_REFUSED_ERROR" },
             { PR_CONNECT_TIMEOUT_ERROR, "PR_CONNECT_TIMEOUT_ERROR" },
             //
             // This error will cause this socket transport to error out;
             // however, if the consumer is HTTP, then the HTTP transaction
             // should be restarted when this error occurs.
             //
             { PR_CONNECT_RESET_ERROR, "PR_CONNECT_RESET_ERROR" },
         };
         n = n % (sizeof(errors)/sizeof(errors[0]));
         code = errors[n].err_code;
         SOCKET_LOG(("simulating NSPR error %d [%s]\n", code, errors[n].err_name));
     }
     return code;
 }
 #endif
 //-----------------------------------------------------------------------------
 static bool
 IsNSSErrorCode(PRErrorCode code)
 {
   return
     ((code >= nsINSSErrorsService::NSS_SEC_ERROR_BASE) &&
       (code < nsINSSErrorsService::NSS_SEC_ERROR_LIMIT))
     ||
     ((code >= nsINSSErrorsService::NSS_SSL_ERROR_BASE) &&
       (code < nsINSSErrorsService::NSS_SSL_ERROR_LIMIT));
 }
 // this logic is duplicated from the implementation of
 // nsINSSErrorsService::getXPCOMFromNSSError
 // It might have been better to implement that interface here...
 static nsresult
 GetXPCOMFromNSSError(PRErrorCode code)
 {
     // XXX Don't make up nsresults, it's supposed to be an enum (bug 778113)
     return (nsresult)NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_SECURITY,
                                                -1 * code);
 }
 nsresult
 ErrorAccordingToNSPR(PRErrorCode errorCode)
 {
     nsresult rv = NS_ERROR_FAILURE;
     switch (errorCode) {
     case PR_WOULD_BLOCK_ERROR:
         rv = NS_BASE_STREAM_WOULD_BLOCK;
         break;
     case PR_CONNECT_ABORTED_ERROR:
     case PR_CONNECT_RESET_ERROR:
         rv = NS_ERROR_NET_RESET;
         break;
     case PR_END_OF_FILE_ERROR: // XXX document this correlation
         rv = NS_ERROR_NET_INTERRUPT;
         break;
     case PR_CONNECT_REFUSED_ERROR:
     // We lump the following NSPR codes in with PR_CONNECT_REFUSED_ERROR. We
     // could get better diagnostics by adding distinct XPCOM error codes for
     // each of these, but there are a lot of places in Gecko that check
     // specifically for NS_ERROR_CONNECTION_REFUSED, all of which would need to
     // be checked.
     case PR_NETWORK_UNREACHABLE_ERROR:
     case PR_HOST_UNREACHABLE_ERROR:
     case PR_ADDRESS_NOT_AVAILABLE_ERROR:
     // Treat EACCES as a soft error since (at least on Linux) connect() returns
     // EACCES when an IPv6 connection is blocked by a firewall. See bug 270784.
     case PR_NO_ACCESS_RIGHTS_ERROR:
         rv = NS_ERROR_CONNECTION_REFUSED;
         break;
     case PR_ADDRESS_NOT_SUPPORTED_ERROR:
         rv = NS_ERROR_SOCKET_ADDRESS_NOT_SUPPORTED;
         break;
     case PR_IO_TIMEOUT_ERROR:
     case PR_CONNECT_TIMEOUT_ERROR:
         rv = NS_ERROR_NET_TIMEOUT;
         break;
     case PR_OUT_OF_MEMORY_ERROR:
     // These really indicate that the descriptor table filled up, or that the
     // kernel ran out of network buffers - but nobody really cares which part of
     // the system ran out of memory.
     case PR_PROC_DESC_TABLE_FULL_ERROR:
     case PR_SYS_DESC_TABLE_FULL_ERROR:
     case PR_INSUFFICIENT_RESOURCES_ERROR:
         rv = NS_ERROR_OUT_OF_MEMORY;
         break;
     case PR_ADDRESS_IN_USE_ERROR:
         rv = NS_ERROR_SOCKET_ADDRESS_IN_USE;
         break;
     // These filename-related errors can arise when using Unix-domain sockets.
     case PR_FILE_NOT_FOUND_ERROR:
         rv = NS_ERROR_FILE_NOT_FOUND;
         break;
     case PR_IS_DIRECTORY_ERROR:
         rv = NS_ERROR_FILE_IS_DIRECTORY;
         break;
     case PR_LOOP_ERROR:
         rv = NS_ERROR_FILE_UNRESOLVABLE_SYMLINK;
         break;
     case PR_NAME_TOO_LONG_ERROR:
         rv = NS_ERROR_FILE_NAME_TOO_LONG;
         break;
     case PR_NO_DEVICE_SPACE_ERROR:
         rv = NS_ERROR_FILE_NO_DEVICE_SPACE;
         break;
     case PR_NOT_DIRECTORY_ERROR:
         rv = NS_ERROR_FILE_NOT_DIRECTORY;
         break;
     case PR_READ_ONLY_FILESYSTEM_ERROR:
         rv = NS_ERROR_FILE_READ_ONLY;
         break;
     default:
         if (IsNSSErrorCode(errorCode))
             rv = GetXPCOMFromNSSError(errorCode);
         break;
     // NSPR's socket code can return these, but they're not worth breaking out
     // into their own error codes, distinct from NS_ERROR_FAILURE:
     //
     // PR_BAD_DESCRIPTOR_ERROR
     // PR_INVALID_ARGUMENT_ERROR
     // PR_NOT_SOCKET_ERROR
     // PR_NOT_TCP_SOCKET_ERROR
     //   These would indicate a bug internal to the component.
     //
     // PR_PROTOCOL_NOT_SUPPORTED_ERROR
     //   This means that we can't use the given "protocol" (like
     //   IPPROTO_TCP or IPPROTO_UDP) with a socket of the given type. As
     //   above, this indicates an internal bug.
     //
     // PR_IS_CONNECTED_ERROR
     //   This indicates that we've applied a system call like 'bind' or
     //   'connect' to a socket that is already connected. The socket
     //   components manage each file descriptor's state, and in some cases
     //   handle this error result internally. We shouldn't be returning
     //   this to our callers.
     //
     // PR_IO_ERROR
     //   This is so vague that NS_ERROR_FAILURE is just as good.
     }
     SOCKET_LOG(("ErrorAccordingToNSPR [in=%d out=%x]\n", errorCode, rv));
     return rv;
 }
 //-----------------------------------------------------------------------------
 // socket input stream impl
 //-----------------------------------------------------------------------------
 nsSocketInputStream::nsSocketInputStream(nsSocketTransport *trans)
     : mTransport(trans)
     , mReaderRefCnt(0)
     , mCondition(NS_OK)
     , mCallbackFlags(0)
     , mByteCount(0)
 {
 }
 nsSocketInputStream::~nsSocketInputStream()
 {
 }
 // called on the socket transport thread...
 //
 //   condition : failure code if socket has been closed
 //
 void
 nsSocketInputStream::OnSocketReady(nsresult condition)
 {
     SOCKET_LOG(("nsSocketInputStream::OnSocketReady [this=%p cond=%x]\n",
         this, condition));
     NS_ASSERTION(PR_GetCurrentThread() == gSocketThread, "wrong thread");
     nsCOMPtr<nsIInputStreamCallback> callback;
     {
         MutexAutoLock lock(mTransport->mLock);
         // update condition, but be careful not to erase an already
         // existing error condition.
         if (NS_SUCCEEDED(mCondition))
             mCondition = condition;
         // ignore event if only waiting for closure and not closed.
         if (NS_FAILED(mCondition) || !(mCallbackFlags & WAIT_CLOSURE_ONLY)) {
             callback = mCallback;
             mCallback = nullptr;
             mCallbackFlags = 0;
         }
     }
     if (callback)
         callback->OnInputStreamReady(this);
 }
 NS_IMPL_QUERY_INTERFACE(nsSocketInputStream,
                         nsIInputStream,
                         nsIAsyncInputStream)
 NS_IMETHODIMP_(MozExternalRefCountType)
 nsSocketInputStream::AddRef()
 {
     ++mReaderRefCnt;
     return mTransport->AddRef();
 }
 NS_IMETHODIMP_(MozExternalRefCountType)
 nsSocketInputStream::Release()
 {
     if (--mReaderRefCnt == 0)
         Close();
     return mTransport->Release();
 }
 NS_IMETHODIMP
 nsSocketInputStream::Close()
 {
     return CloseWithStatus(NS_BASE_STREAM_CLOSED);
 }
 NS_IMETHODIMP
 nsSocketInputStream::Available(uint64_t *avail)
 {
     SOCKET_LOG(("nsSocketInputStream::Available [this=%p]\n", this));
     *avail = 0;
     PRFileDesc *fd;
     {
         MutexAutoLock lock(mTransport->mLock);
         if (NS_FAILED(mCondition))
             return mCondition;
         fd = mTransport->GetFD_Locked();
         if (!fd)
             return NS_OK;
     }
     // cannot hold lock while calling NSPR.  (worried about the fact that PSM
     // synchronously proxies notifications over to the UI thread, which could
     // mistakenly try to re-enter this code.)
     int32_t n = PR_Available(fd);
     // PSM does not implement PR_Available() so do a best approximation of it
     // with MSG_PEEK
     if ((n == -1) && (PR_GetError() == PR_NOT_IMPLEMENTED_ERROR)) {
         char c;
         n = PR_Recv(fd, &c, 1, PR_MSG_PEEK, 0);
         SOCKET_LOG(("nsSocketInputStream::Available [this=%p] "
                     "using PEEK backup n=%d]\n", this, n));
     }
     nsresult rv;
     {
         MutexAutoLock lock(mTransport->mLock);
         mTransport->ReleaseFD_Locked(fd);
         if (n >= 0)
             *avail = n;
         else {
             PRErrorCode code = PR_GetError();
             if (code == PR_WOULD_BLOCK_ERROR)
                 return NS_OK;
             mCondition = ErrorAccordingToNSPR(code);
         }
         rv = mCondition;
     }
     if (NS_FAILED(rv))
         mTransport->OnInputClosed(rv);
     return rv;
 }
 NS_IMETHODIMP
 nsSocketInputStream::Read(char *buf, uint32_t count, uint32_t *countRead)
 {
     SOCKET_LOG(("nsSocketInputStream::Read [this=%p count=%u]\n", this, count));
     *countRead = 0;
     PRFileDesc* fd = nullptr;
     {
         MutexAutoLock lock(mTransport->mLock);
         if (NS_FAILED(mCondition))
             return (mCondition == NS_BASE_STREAM_CLOSED) ? NS_OK : mCondition;
         fd = mTransport->GetFD_Locked();
         if (!fd)
             return NS_BASE_STREAM_WOULD_BLOCK;
     }
     SOCKET_LOG(("  calling PR_Read [count=%u]\n", count));
     // cannot hold lock while calling NSPR.  (worried about the fact that PSM
     // synchronously proxies notifications over to the UI thread, which could
     // mistakenly try to re-enter this code.)
     int32_t n = PR_Read(fd, buf, count);
     SOCKET_LOG(("  PR_Read returned [n=%d]\n", n));
     nsresult rv = NS_OK;
     {
         MutexAutoLock lock(mTransport->mLock);
 #ifdef ENABLE_SOCKET_TRACING
         if (n > 0)
             mTransport->TraceInBuf(buf, n);
 #endif
         mTransport->ReleaseFD_Locked(fd);
         if (n > 0)
             mByteCount += (*countRead = n);
         else if (n < 0) {
             PRErrorCode code = PR_GetError();
             if (code == PR_WOULD_BLOCK_ERROR)
                 return NS_BASE_STREAM_WOULD_BLOCK;
             mCondition = ErrorAccordingToNSPR(code);
         }
         rv = mCondition;
     }
     if (NS_FAILED(rv))
         mTransport->OnInputClosed(rv);
     // only send this notification if we have indeed read some data.
     // see bug 196827 for an example of why this is important.
     if (n > 0)
         mTransport->SendStatus(NS_NET_STATUS_RECEIVING_FROM);
     return rv;
 }
 NS_IMETHODIMP
 nsSocketInputStream::ReadSegments(nsWriteSegmentFun writer, void *closure,
                                   uint32_t count, uint32_t *countRead)
 {
     // socket stream is unbuffered
     return NS_ERROR_NOT_IMPLEMENTED;
 }
 NS_IMETHODIMP
 nsSocketInputStream::IsNonBlocking(bool *nonblocking)
 {
     *nonblocking = true;
     return NS_OK;
 }
 NS_IMETHODIMP
 nsSocketInputStream::CloseWithStatus(nsresult reason)
 {
     SOCKET_LOG(("nsSocketInputStream::CloseWithStatus [this=%p reason=%x]\n", this, reason));
     // may be called from any thread
     nsresult rv;
     {
         MutexAutoLock lock(mTransport->mLock);
         if (NS_SUCCEEDED(mCondition))
             rv = mCondition = reason;
         else
             rv = NS_OK;
     }
     if (NS_FAILED(rv))
         mTransport->OnInputClosed(rv);
     return NS_OK;
 }
 NS_IMETHODIMP
 nsSocketInputStream::AsyncWait(nsIInputStreamCallback *callback,
                                uint32_t flags,
                                uint32_t amount,
                                nsIEventTarget *target)
 {
     SOCKET_LOG(("nsSocketInputStream::AsyncWait [this=%p]\n", this));
     bool hasError = false;
     {
         MutexAutoLock lock(mTransport->mLock);
         if (callback && target) {
             //
             // build event proxy
             //
             mCallback = NS_NewInputStreamReadyEvent(callback, target);
         }
         else
             mCallback = callback;
         mCallbackFlags = flags;
         hasError = NS_FAILED(mCondition);
     } // unlock mTransport->mLock
     if (hasError) {
         // OnSocketEvent will call OnInputStreamReady with an error code after
         // going through the event loop. We do this because most socket callers
         // do not expect AsyncWait() to synchronously execute the OnInputStreamReady
         // callback.
         mTransport->PostEvent(nsSocketTransport::MSG_INPUT_PENDING);
     } else {
         mTransport->OnInputPending();
     }
     return NS_OK;
 }
 //-----------------------------------------------------------------------------
 // socket output stream impl
 //-----------------------------------------------------------------------------
 nsSocketOutputStream::nsSocketOutputStream(nsSocketTransport *trans)
     : mTransport(trans)
     , mWriterRefCnt(0)
     , mCondition(NS_OK)
     , mCallbackFlags(0)
     , mByteCount(0)
 {
 }
 nsSocketOutputStream::~nsSocketOutputStream()
 {
 }
 // called on the socket transport thread...
 //
 //   condition : failure code if socket has been closed
 //
 void
 nsSocketOutputStream::OnSocketReady(nsresult condition)
 {
     SOCKET_LOG(("nsSocketOutputStream::OnSocketReady [this=%p cond=%x]\n",
         this, condition));
     NS_ASSERTION(PR_GetCurrentThread() == gSocketThread, "wrong thread");
     nsCOMPtr<nsIOutputStreamCallback> callback;
     {
         MutexAutoLock lock(mTransport->mLock);
         // update condition, but be careful not to erase an already
         // existing error condition.
         if (NS_SUCCEEDED(mCondition))
             mCondition = condition;
         // ignore event if only waiting for closure and not closed.
         if (NS_FAILED(mCondition) || !(mCallbackFlags & WAIT_CLOSURE_ONLY)) {
             callback = mCallback;
             mCallback = nullptr;
             mCallbackFlags = 0;
         }
     }
     if (callback)
         callback->OnOutputStreamReady(this);
 }
 NS_IMPL_QUERY_INTERFACE(nsSocketOutputStream,
                         nsIOutputStream,
                         nsIAsyncOutputStream)
 NS_IMETHODIMP_(MozExternalRefCountType)
 nsSocketOutputStream::AddRef()
 {
     ++mWriterRefCnt;
     return mTransport->AddRef();
 }
 NS_IMETHODIMP_(MozExternalRefCountType)
 nsSocketOutputStream::Release()
 {
     if (--mWriterRefCnt == 0)
         Close();
     return mTransport->Release();
 }
 NS_IMETHODIMP
 nsSocketOutputStream::Close()
 {
     return CloseWithStatus(NS_BASE_STREAM_CLOSED);
 }
 NS_IMETHODIMP
 nsSocketOutputStream::Flush()
 {
     return NS_OK;
 }
 NS_IMETHODIMP
 nsSocketOutputStream::Write(const char *buf, uint32_t count, uint32_t *countWritten)
 {
     SOCKET_LOG(("nsSocketOutputStream::Write [this=%p count=%u]\n", this, count));
     *countWritten = 0;
     // A write of 0 bytes can be used to force the initial SSL handshake, so do
     // not reject that.
     PRFileDesc* fd = nullptr;
     {
         MutexAutoLock lock(mTransport->mLock);
         if (NS_FAILED(mCondition))
             return mCondition;
         fd = mTransport->GetFD_Locked();
         if (!fd)
             return NS_BASE_STREAM_WOULD_BLOCK;
     }
     SOCKET_LOG(("  calling PR_Write [count=%u]\n", count));
     // cannot hold lock while calling NSPR.  (worried about the fact that PSM
     // synchronously proxies notifications over to the UI thread, which could
     // mistakenly try to re-enter this code.)
     int32_t n = PR_Write(fd, buf, count);
     SOCKET_LOG(("  PR_Write returned [n=%d]\n", n));
     nsresult rv = NS_OK;
     {
         MutexAutoLock lock(mTransport->mLock);
 #ifdef ENABLE_SOCKET_TRACING
         if (n > 0)
             mTransport->TraceOutBuf(buf, n);
 #endif
         mTransport->ReleaseFD_Locked(fd);
         if (n > 0)
             mByteCount += (*countWritten = n);
         else if (n < 0) {
             PRErrorCode code = PR_GetError();
             if (code == PR_WOULD_BLOCK_ERROR)
                 return NS_BASE_STREAM_WOULD_BLOCK;
             mCondition = ErrorAccordingToNSPR(code);
         }
         rv = mCondition;
     }
     if (NS_FAILED(rv))
         mTransport->OnOutputClosed(rv);
     // only send this notification if we have indeed written some data.
     // see bug 196827 for an example of why this is important.
     if (n > 0)
         mTransport->SendStatus(NS_NET_STATUS_SENDING_TO);
     return rv;
 }
 NS_IMETHODIMP
 nsSocketOutputStream::WriteSegments(nsReadSegmentFun reader, void *closure,
                                     uint32_t count, uint32_t *countRead)
 {
     // socket stream is unbuffered
     return NS_ERROR_NOT_IMPLEMENTED;
 }
 NS_METHOD
 nsSocketOutputStream::WriteFromSegments(nsIInputStream *input,
                                         void *closure,
                                         const char *fromSegment,
                                         uint32_t offset,
                                         uint32_t count,
                                         uint32_t *countRead)
 {
     nsSocketOutputStream *self = (nsSocketOutputStream *) closure;
     return self->Write(fromSegment, count, countRead);
 }
 NS_IMETHODIMP
 nsSocketOutputStream::WriteFrom(nsIInputStream *stream, uint32_t count, uint32_t *countRead)
 {
     return stream->ReadSegments(WriteFromSegments, this, count, countRead);
 }
 NS_IMETHODIMP
 nsSocketOutputStream::IsNonBlocking(bool *nonblocking)
 {
     *nonblocking = true;
     return NS_OK;
 }
 NS_IMETHODIMP
 nsSocketOutputStream::CloseWithStatus(nsresult reason)
 {
     SOCKET_LOG(("nsSocketOutputStream::CloseWithStatus [this=%p reason=%x]\n", this, reason));
     // may be called from any thread
     nsresult rv;
     {
         MutexAutoLock lock(mTransport->mLock);
         if (NS_SUCCEEDED(mCondition))
             rv = mCondition = reason;
         else
             rv = NS_OK;
     }
     if (NS_FAILED(rv))
         mTransport->OnOutputClosed(rv);
     return NS_OK;
 }
 NS_IMETHODIMP
 nsSocketOutputStream::AsyncWait(nsIOutputStreamCallback *callback,
                                 uint32_t flags,
                                 uint32_t amount,
                                 nsIEventTarget *target)
 {
     SOCKET_LOG(("nsSocketOutputStream::AsyncWait [this=%p]\n", this));
     {
         MutexAutoLock lock(mTransport->mLock);
         if (callback && target) {
             //
             // build event proxy
             //
             mCallback = NS_NewOutputStreamReadyEvent(callback, target);
         }
         else
             mCallback = callback;
         mCallbackFlags = flags;
     }
     mTransport->OnOutputPending();
     return NS_OK;
 }
 //-----------------------------------------------------------------------------
 // socket transport impl
 //-----------------------------------------------------------------------------
 nsSocketTransport::nsSocketTransport()
     : mTypes(nullptr)
     , mTypeCount(0)
     , mPort(0)
     , mHttpsProxy(false)
     , mProxyUse(false)
     , mProxyTransparent(false)
     , mProxyTransparentResolvesHost(false)
     , mConnectionFlags(0)
     , mState(STATE_CLOSED)
     , mAttached(false)
     , mInputClosed(true)
     , mOutputClosed(true)
     , mResolving(false)
     , mNetAddrIsSet(false)
     , mLock("nsSocketTransport.mLock")
     , mFD(MOZ_THIS_IN_INITIALIZER_LIST())
     , mFDref(0)
     , mFDconnected(false)
     , mSocketTransportService(gSocketTransportService)
     , mInput(MOZ_THIS_IN_INITIALIZER_LIST())
     , mOutput(MOZ_THIS_IN_INITIALIZER_LIST())
     , mQoSBits(0x00)
     , mKeepaliveEnabled(false)
     , mKeepaliveIdleTimeS(-1)
     , mKeepaliveRetryIntervalS(-1)
     , mKeepaliveProbeCount(-1)
 {
     SOCKET_LOG(("creating nsSocketTransport @%p\n", this));
     mTimeouts[TIMEOUT_CONNECT]    = UINT16_MAX; // no timeout
     mTimeouts[TIMEOUT_READ_WRITE] = UINT16_MAX; // no timeout
 }
 nsSocketTransport::~nsSocketTransport()
 {
     SOCKET_LOG(("destroying nsSocketTransport @%p\n", this));
     // cleanup socket type info
     if (mTypes) {
         uint32_t i;
         for (i=0; i<mTypeCount; ++i)
             PL_strfree(mTypes[i]);
         free(mTypes);
     }
 }
 nsresult
 nsSocketTransport::Init(const char **types, uint32_t typeCount,
                         const nsACString &host, uint16_t port,
                         nsIProxyInfo *givenProxyInfo)
 {
     MOZ_EVENT_TRACER_NAME_OBJECT(this, host.BeginReading());
     nsCOMPtr<nsProxyInfo> proxyInfo;
     if (givenProxyInfo) {
         proxyInfo = do_QueryInterface(givenProxyInfo);
         NS_ENSURE_ARG(proxyInfo);
     }
     // init socket type info
     mPort = port;
     mHost = host;
     const char *proxyType = nullptr;
     if (proxyInfo) {
         mProxyInfo = proxyInfo;
         // grab proxy type (looking for "socks" for example)
         proxyType = proxyInfo->Type();
         if (proxyType && (strcmp(proxyType, "http") == 0 ||
                           strcmp(proxyType, "direct") == 0 ||
                           strcmp(proxyType, "unknown") == 0))
             proxyType = nullptr;
         mProxyUse = true;
         // check that we don't have a proxyInfo without proxy
         nsCString proxyHost;
         proxyInfo->GetHost(proxyHost);
         if (!proxyType || proxyHost.IsEmpty()) {
             mProxyUse = false;
         }
     }
     SOCKET_LOG(("nsSocketTransport::Init [this=%x host=%s:%hu proxy=%s]\n",
         this, mHost.get(), mPort, mProxyUse ? "yes" : "no"));
     // include proxy type as a socket type if proxy type is not "http"
     mTypeCount = typeCount + (proxyType != nullptr);
     if (!mTypeCount)
         return NS_OK;
     // if we have socket types, then the socket provider service had
     // better exist!
     nsresult rv;
     nsCOMPtr<nsISocketProviderService> spserv =
         do_GetService(kSocketProviderServiceCID, &rv);
     if (NS_FAILED(rv)) return rv;
     mTypes = (char **) malloc(mTypeCount * sizeof(char *));
     if (!mTypes)
         return NS_ERROR_OUT_OF_MEMORY;
     // now verify that each socket type has a registered socket provider.
     for (uint32_t i = 0, type = 0; i < mTypeCount; ++i) {
         // store socket types
         if (i == 0 && proxyType)
             mTypes[i] = PL_strdup(proxyType);
         else
             mTypes[i] = PL_strdup(types[type++]);
         if (!mTypes[i]) {
             mTypeCount = i;
             return NS_ERROR_OUT_OF_MEMORY;
         }
         nsCOMPtr<nsISocketProvider> provider;
         rv = spserv->GetSocketProvider(mTypes[i], getter_AddRefs(provider));
         if (NS_FAILED(rv)) {
             NS_WARNING("no registered socket provider");
             return rv;
         }
         // note if socket type corresponds to a transparent proxy
         // XXX don't hardcode SOCKS here (use proxy info's flags instead).
         if ((strcmp(mTypes[i], "socks") == 0) ||
             (strcmp(mTypes[i], "socks4") == 0)) {
             mProxyTransparent = true;
             if (proxyInfo->Flags() & nsIProxyInfo::TRANSPARENT_PROXY_RESOLVES_HOST) {
                 // we want the SOCKS layer to send the hostname
                 // and port to the proxy and let it do the DNS.
                 mProxyTransparentResolvesHost = true;
             }
         }
     }
     return NS_OK;
 }
 nsresult
 nsSocketTransport::InitWithFilename(const char *filename)
 {
 #if defined(XP_UNIX)
     size_t filenameLength = strlen(filename);
     if (filenameLength > sizeof(mNetAddr.local.path) - 1)
         return NS_ERROR_FILE_NAME_TOO_LONG;
     mHost.Assign(filename);
     mPort = 0;
     mTypeCount = 0;
     mNetAddr.local.family = AF_LOCAL;
     memcpy(mNetAddr.local.path, filename, filenameLength);
     mNetAddr.local.path[filenameLength] = '\0';
     mNetAddrIsSet = true;
     return NS_OK;
 #else
     return NS_ERROR_SOCKET_ADDRESS_NOT_SUPPORTED;
 #endif
 }
 nsresult
 nsSocketTransport::InitWithConnectedSocket(PRFileDesc *fd, const NetAddr *addr)
 {
     NS_ASSERTION(!mFD.IsInitialized(), "already initialized");
     char buf[kNetAddrMaxCStrBufSize];
     NetAddrToString(addr, buf, sizeof(buf));
     mHost.Assign(buf);
     uint16_t port;
     if (addr->raw.family == AF_INET)
         port = addr->inet.port;
     else if (addr->raw.family == AF_INET6)
         port = addr->inet6.port;
     else
         port = 0;
     mPort = ntohs(port);
     memcpy(&mNetAddr, addr, sizeof(NetAddr));
     mPollFlags = (PR_POLL_READ | PR_POLL_WRITE | PR_POLL_EXCEPT);
     mPollTimeout = mTimeouts[TIMEOUT_READ_WRITE];
     mState = STATE_TRANSFERRING;
     mNetAddrIsSet = true;
     {
         MutexAutoLock lock(mLock);
         mFD = fd;
         mFDref = 1;
         mFDconnected = 1;
     }
     // make sure new socket is non-blocking
     PRSocketOptionData opt;
     opt.option = PR_SockOpt_Nonblocking;
     opt.value.non_blocking = true;
     PR_SetSocketOption(fd, &opt);
     SOCKET_LOG(("nsSocketTransport::InitWithConnectedSocket [this=%p addr=%s:%hu]\n",
         this, mHost.get(), mPort));
     // jump to InitiateSocket to get ourselves attached to the STS poll list.
     return PostEvent(MSG_RETRY_INIT_SOCKET);
 }
 nsresult
 nsSocketTransport::PostEvent(uint32_t type, nsresult status, nsISupports *param)
 {
     SOCKET_LOG(("nsSocketTransport::PostEvent [this=%p type=%u status=%x param=%p]\n",
         this, type, status, param));
     nsCOMPtr<nsIRunnable> event = new nsSocketEvent(this, type, status, param);
     if (!event)
         return NS_ERROR_OUT_OF_MEMORY;
     return mSocketTransportService->Dispatch(event, NS_DISPATCH_NORMAL);
 }
 void
 nsSocketTransport::SendStatus(nsresult status)
 {
     SOCKET_LOG(("nsSocketTransport::SendStatus [this=%p status=%x]\n", this, status));
     nsCOMPtr<nsITransportEventSink> sink;
     uint64_t progress;
     {
         MutexAutoLock lock(mLock);
         sink = mEventSink;
         switch (status) {
         case NS_NET_STATUS_SENDING_TO:
             progress = mOutput.ByteCount();
             break;
         case NS_NET_STATUS_RECEIVING_FROM:
             progress = mInput.ByteCount();
             break;
         default:
             progress = 0;
             break;
         }
     }
     if (sink)
         sink->OnTransportStatus(this, status, progress, UINT64_MAX);
 }
 nsresult
 nsSocketTransport::ResolveHost()
 {
     SOCKET_LOG(("nsSocketTransport::ResolveHost [this=%p %s:%d%s]\n",
                 this, SocketHost().get(), SocketPort(),
                 mConnectionFlags & nsSocketTransport::BYPASS_CACHE ?
                 " bypass cache" : ""));
     nsresult rv;
     if (mProxyUse) {
         if (!mProxyTransparent || mProxyTransparentResolvesHost) {
 #if defined(XP_UNIX)
             NS_ABORT_IF_FALSE(!mNetAddrIsSet || mNetAddr.raw.family != AF_LOCAL,
                               "Unix domain sockets can't be used with proxies");
 #endif
             // When not resolving mHost locally, we still want to ensure that
             // it only contains valid characters.  See bug 304904 for details.
             if (!net_IsValidHostName(mHost))
                 return NS_ERROR_UNKNOWN_HOST;
         }
         if (mProxyTransparentResolvesHost) {
             // Name resolution is done on the server side.  Just pretend
             // client resolution is complete, this will get picked up later.
             // since we don't need to do DNS now, we bypass the resolving
             // step by initializing mNetAddr to an empty address, but we
             // must keep the port. The SOCKS IO layer will use the hostname
             // we send it when it's created, rather than the empty address
             // we send with the connect call.
             mState = STATE_RESOLVING;
             mNetAddr.raw.family = AF_INET;
             mNetAddr.inet.port = htons(SocketPort());
             mNetAddr.inet.ip = htonl(INADDR_ANY);
             return PostEvent(MSG_DNS_LOOKUP_COMPLETE, NS_OK, nullptr);
         }
     }
     nsCOMPtr<nsIDNSService> dns = do_GetService(kDNSServiceCID, &rv);
     if (NS_FAILED(rv)) return rv;
     mResolving = true;
     uint32_t dnsFlags = 0;
     if (mConnectionFlags & nsSocketTransport::BYPASS_CACHE)
         dnsFlags = nsIDNSService::RESOLVE_BYPASS_CACHE;
     if (mConnectionFlags & nsSocketTransport::DISABLE_IPV6)
         dnsFlags |= nsIDNSService::RESOLVE_DISABLE_IPV6;
     if (mConnectionFlags & nsSocketTransport::DISABLE_IPV4)
         dnsFlags |= nsIDNSService::RESOLVE_DISABLE_IPV4;
     NS_ASSERTION(!(dnsFlags & nsIDNSService::RESOLVE_DISABLE_IPV6) ||
                  !(dnsFlags & nsIDNSService::RESOLVE_DISABLE_IPV4),
                  "Setting both RESOLVE_DISABLE_IPV6 and RESOLVE_DISABLE_IPV4");
     SendStatus(NS_NET_STATUS_RESOLVING_HOST);
     rv = dns->AsyncResolve(SocketHost(), dnsFlags, this, nullptr,
                            getter_AddRefs(mDNSRequest));
     if (NS_SUCCEEDED(rv)) {
         SOCKET_LOG(("  advancing to STATE_RESOLVING\n"));
         mState = STATE_RESOLVING;
     }
     return rv;
 }
 nsresult
 nsSocketTransport::BuildSocket(PRFileDesc *&fd, bool &proxyTransparent, bool &usingSSL)
 {
     SOCKET_LOG(("nsSocketTransport::BuildSocket [this=%p]\n", this));
     nsresult rv;
     proxyTransparent = false;
     usingSSL = false;
     if (mTypeCount == 0) {
         fd = PR_OpenTCPSocket(mNetAddr.raw.family);
         rv = fd ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
     }
     else {
 #if defined(XP_UNIX)
         NS_ABORT_IF_FALSE(!mNetAddrIsSet || mNetAddr.raw.family != AF_LOCAL,
                           "Unix domain sockets can't be used with socket types");
 #endif
         fd = nullptr;
         nsCOMPtr<nsISocketProviderService> spserv =
             do_GetService(kSocketProviderServiceCID, &rv);
         if (NS_FAILED(rv)) return rv;
         const char *host       = mHost.get();
         int32_t     port       = (int32_t) mPort;
         uint32_t    proxyFlags = 0;
         nsCOMPtr<nsIProxyInfo> proxy = mProxyInfo;
         uint32_t i;
         for (i=0; i<mTypeCount; ++i) {
             nsCOMPtr<nsISocketProvider> provider;
             SOCKET_LOG(("  pushing io layer [%u:%s]\n", i, mTypes[i]));
             rv = spserv->GetSocketProvider(mTypes[i], getter_AddRefs(provider));
             if (NS_FAILED(rv))
                 break;
             if (mProxyTransparentResolvesHost)
                 proxyFlags |= nsISocketProvider::PROXY_RESOLVES_HOST;
             if (mConnectionFlags & nsISocketTransport::ANONYMOUS_CONNECT)
                 proxyFlags |= nsISocketProvider::ANONYMOUS_CONNECT;
             if (mConnectionFlags & nsISocketTransport::NO_PERMANENT_STORAGE)
                 proxyFlags |= nsISocketProvider::NO_PERMANENT_STORAGE;
             nsCOMPtr<nsISupports> secinfo;
             if (i == 0) {
                 // if this is the first type, we'll want the
                 // service to allocate a new socket
                 nsCString proxyHost;
                 GetHost(proxyHost);
                 int32_t proxyPort;
                 GetPort(&proxyPort);
                 rv = provider->NewSocket(mNetAddr.raw.family,
                                          mHttpsProxy ? proxyHost.get() : host,
                                          mHttpsProxy ? proxyPort : port,
                                          proxy,
                                          proxyFlags, &fd,
                                          getter_AddRefs(secinfo));
                 if (NS_SUCCEEDED(rv) && !fd) {
                     NS_NOTREACHED("NewSocket succeeded but failed to create a PRFileDesc");
                     rv = NS_ERROR_UNEXPECTED;
                 }
             }
             else {
                 // the socket has already been allocated,
                 // so we just want the service to add itself
                 // to the stack (such as pushing an io layer)
                 rv = provider->AddToSocket(mNetAddr.raw.family,
                                            host, port, proxy,
                                            proxyFlags, fd,
                                            getter_AddRefs(secinfo));
             }
             // proxyFlags = 0; not used below this point...
             if (NS_FAILED(rv))
                 break;
             // if the service was ssl or starttls, we want to hold onto the socket info
             bool isSSL = (strcmp(mTypes[i], "ssl") == 0);
             if (isSSL || (strcmp(mTypes[i], "starttls") == 0)) {
                 // remember security info and give notification callbacks to PSM...
                 nsCOMPtr<nsIInterfaceRequestor> callbacks;
                 {
                     MutexAutoLock lock(mLock);
                     mSecInfo = secinfo;
                     callbacks = mCallbacks;
                     SOCKET_LOG(("  [secinfo=%x callbacks=%x]\n", mSecInfo.get(), mCallbacks.get()));
                 }
                 // don't call into PSM while holding mLock!!
                 nsCOMPtr<nsISSLSocketControl> secCtrl(do_QueryInterface(secinfo));
                 if (secCtrl)
                     secCtrl->SetNotificationCallbacks(callbacks);
                 // remember if socket type is SSL so we can ProxyStartSSL if need be.
                 usingSSL = isSSL;
             }
             else if ((strcmp(mTypes[i], "socks") == 0) ||
                      (strcmp(mTypes[i], "socks4") == 0)) {
                 // since socks is transparent, any layers above
                 // it do not have to worry about proxy stuff
                 proxy = nullptr;
                 proxyTransparent = true;
             }
         }
         if (NS_FAILED(rv)) {
             SOCKET_LOG(("  error pushing io layer [%u:%s rv=%x]\n", i, mTypes[i], rv));
             if (fd)
                 PR_Close(fd);
         }
     }
     return rv;
 }
 nsresult
 nsSocketTransport::InitiateSocket()
 {
     SOCKET_LOG(("nsSocketTransport::InitiateSocket [this=%p]\n", this));
     static bool crashOnNonLocalConnections = !!getenv("MOZ_DISABLE_NONLOCAL_CONNECTIONS");
     nsresult rv;
     bool isLocal;
     IsLocal(&isLocal);
     if (gIOService->IsOffline()) {
         if (!isLocal)
             return NS_ERROR_OFFLINE;
     } else if (!isLocal) {
         if (NS_SUCCEEDED(mCondition) &&
             crashOnNonLocalConnections &&
             !(IsIPAddrAny(&mNetAddr) || IsIPAddrLocal(&mNetAddr))) {
             nsAutoCString ipaddr;
             nsRefPtr<nsNetAddr> netaddr = new nsNetAddr(&mNetAddr);
             netaddr->GetAddress(ipaddr);
             fprintf_stderr(stderr,
                            "FATAL ERROR: Non-local network connections are disabled and a connection "
                            "attempt to %s (%s) was made.\nYou should only access hostnames "
                            "available via the test networking proxy (if running mochitests) "
                            "or from a test-specific httpd.js server (if running xpcshell tests). "
                            "Browser services should be disabled or redirected to a local server.\n",
                            mHost.get(), ipaddr.get());
             MOZ_CRASH("Attempting to connect to non-local address!");
         }
     }
     // Hosts/Proxy Hosts that are Local IP Literals should not be speculatively
     // connected - Bug 853423.
     if (mConnectionFlags & nsISocketTransport::DISABLE_RFC1918 &&
         IsIPAddrLocal(&mNetAddr)) {
 #ifdef PR_LOGGING
         if (SOCKET_LOG_ENABLED()) {
             nsAutoCString netAddrCString;
             netAddrCString.SetCapacity(kIPv6CStrBufSize);
             if (!NetAddrToString(&mNetAddr,
                                  netAddrCString.BeginWriting(),
                                  kIPv6CStrBufSize))
                 netAddrCString = NS_LITERAL_CSTRING("<IP-to-string failed>");
             nsCString proxyHost;
             GetHost(proxyHost);
             int32_t proxyPort;
             GetPort(&proxyPort);
             SOCKET_LOG(("nsSocketTransport::InitiateSocket skipping "
                         "speculative connection for host [%s:%d] proxy "
                         "[%s:%d] with Local IP address [%s]",
                         mHost.get(), mPort, proxyHost.get(), proxyPort,
                         netAddrCString.get()));
         }
 #endif
         return NS_ERROR_CONNECTION_REFUSED;
     }
     //
     // find out if it is going to be ok to attach another socket to the STS.
     // if not then we have to wait for the STS to tell us that it is ok.
     // the notification is asynchronous, which means that when we could be
     // in a race to call AttachSocket once notified.  for this reason, when
     // we get notified, we just re-enter this function.  as a result, we are
     // sure to ask again before calling AttachSocket.  in this way we deal
     // with the race condition.  though it isn't the most elegant solution,
     // it is far simpler than trying to build a system that would guarantee
     // FIFO ordering (which wouldn't even be that valuable IMO).  see bug
     // 194402 for more info.
     //
     if (!mSocketTransportService->CanAttachSocket()) {
         nsCOMPtr<nsIRunnable> event =
                 new nsSocketEvent(this, MSG_RETRY_INIT_SOCKET);
         if (!event)
             return NS_ERROR_OUT_OF_MEMORY;
         return mSocketTransportService->NotifyWhenCanAttachSocket(event);
     }
     //
     // if we already have a connected socket, then just attach and return.
     //
     if (mFD.IsInitialized()) {
         rv = mSocketTransportService->AttachSocket(mFD, this);
         if (NS_SUCCEEDED(rv))
             mAttached = true;
         return rv;
     }
     //
     // create new socket fd, push io layers, etc.
     //
     PRFileDesc *fd;
     bool proxyTransparent;
     bool usingSSL;
     rv = BuildSocket(fd, proxyTransparent, usingSSL);
     if (NS_FAILED(rv)) {
         SOCKET_LOG(("  BuildSocket failed [rv=%x]\n", rv));
         return rv;
     }
     // Attach network activity monitor
     mozilla::net::NetworkActivityMonitor::AttachIOLayer(fd);
     PRStatus status;
     // Make the socket non-blocking...
     PRSocketOptionData opt;
     opt.option = PR_SockOpt_Nonblocking;
     opt.value.non_blocking = true;
     status = PR_SetSocketOption(fd, &opt);
     NS_ASSERTION(status == PR_SUCCESS, "unable to make socket non-blocking");
     // disable the nagle algorithm - if we rely on it to coalesce writes into
     // full packets the final packet of a multi segment POST/PUT or pipeline
     // sequence is delayed a full rtt
     opt.option = PR_SockOpt_NoDelay;
     opt.value.no_delay = true;
     PR_SetSocketOption(fd, &opt);
     // if the network.tcp.sendbuffer preference is set, use it to size SO_SNDBUF
     // The Windows default of 8KB is too small and as of vista sp1, autotuning
     // only applies to receive window
     int32_t sndBufferSize;
     mSocketTransportService->GetSendBufferSize(&sndBufferSize);
     if (sndBufferSize > 0) {
         opt.option = PR_SockOpt_SendBufferSize;
         opt.value.send_buffer_size = sndBufferSize;
         PR_SetSocketOption(fd, &opt);
     }
     if (mQoSBits) {
         opt.option = PR_SockOpt_IpTypeOfService;
         opt.value.tos = mQoSBits;
         PR_SetSocketOption(fd, &opt);
     }
     // inform socket transport about this newly created socket...
     rv = mSocketTransportService->AttachSocket(fd, this);
     if (NS_FAILED(rv)) {
         PR_Close(fd);
         return rv;
     }
     mAttached = true;
     // assign mFD so that we can properly handle OnSocketDetached before we've
     // established a connection.
     {
         MutexAutoLock lock(mLock);
         mFD = fd;
         mFDref = 1;
         mFDconnected = false;
     }
     SOCKET_LOG(("  advancing to STATE_CONNECTING\n"));
     mState = STATE_CONNECTING;
     mPollTimeout = mTimeouts[TIMEOUT_CONNECT];
     SendStatus(NS_NET_STATUS_CONNECTING_TO);
 #if defined(PR_LOGGING)
     if (SOCKET_LOG_ENABLED()) {
         char buf[kNetAddrMaxCStrBufSize];
         NetAddrToString(&mNetAddr, buf, sizeof(buf));
         SOCKET_LOG(("  trying address: %s\n", buf));
     }
 #endif
     //
     // Initiate the connect() to the host...
     //
     PRNetAddr prAddr;
     NetAddrToPRNetAddr(&mNetAddr, &prAddr);
     MOZ_EVENT_TRACER_EXEC(this, "net::tcp::connect");
     status = PR_Connect(fd, &prAddr, NS_SOCKET_CONNECT_TIMEOUT);
     if (status == PR_SUCCESS) {
         //
         // we are connected!
         //
         OnSocketConnected();
     }
     else {
         PRErrorCode code = PR_GetError();
 #if defined(TEST_CONNECT_ERRORS)
         code = RandomizeConnectError(code);
 #endif
         //
         // If the PR_Connect(...) would block, then poll for a connection.
         //
         if ((PR_WOULD_BLOCK_ERROR == code) || (PR_IN_PROGRESS_ERROR == code))
             mPollFlags = (PR_POLL_EXCEPT | PR_POLL_WRITE);
         //
         // If the socket is already connected, then return success...
         //
         else if (PR_IS_CONNECTED_ERROR == code) {
             //
             // we are connected!
             //
             OnSocketConnected();
             if (mSecInfo && mProxyUse && proxyTransparent && usingSSL) {
                 // if the connection phase is finished, and the ssl layer has
                 // been pushed, and we were proxying (transparently; ie. nothing
                 // has to happen in the protocol layer above us), it's time for
                 // the ssl to start doing it's thing.
                 nsCOMPtr<nsISSLSocketControl> secCtrl =
                     do_QueryInterface(mSecInfo);
                 if (secCtrl) {
                     SOCKET_LOG(("  calling ProxyStartSSL()\n"));
                     secCtrl->ProxyStartSSL();
                 }
                 // XXX what if we were forced to poll on the socket for a successful
                 // connection... wouldn't we need to call ProxyStartSSL after a call
                 // to PR_ConnectContinue indicates that we are connected?
                 //
                 // XXX this appears to be what the old socket transport did.  why
                 // isn't this broken?
             }
         }
         //
         // A SOCKS request was rejected; get the actual error code from
         // the OS error
         //
         else if (PR_UNKNOWN_ERROR == code &&
                  mProxyUse && mProxyTransparent) {
             code = PR_GetOSError();
             rv = ErrorAccordingToNSPR(code);
         }
         //
         // The connection was refused...
         //
         else {
             rv = ErrorAccordingToNSPR(code);
             if (rv == NS_ERROR_CONNECTION_REFUSED && mProxyUse)
                 rv = NS_ERROR_PROXY_CONNECTION_REFUSED;
         }
     }
     return rv;
 }
 bool
 nsSocketTransport::RecoverFromError()
 {
     NS_ASSERTION(NS_FAILED(mCondition), "there should be something wrong");
     SOCKET_LOG(("nsSocketTransport::RecoverFromError [this=%p state=%x cond=%x]\n",
         this, mState, mCondition));
 #if defined(XP_UNIX)
     // Unix domain connections don't have multiple addresses to try,
     // so the recovery techniques here don't apply.
     if (mNetAddrIsSet && mNetAddr.raw.family == AF_LOCAL)
         return false;
 #endif
     // can only recover from errors in these states
     if (mState != STATE_RESOLVING && mState != STATE_CONNECTING)
         return false;
     nsresult rv;
     // OK to check this outside mLock
     NS_ASSERTION(!mFDconnected, "socket should not be connected");
     // all connection failures need to be reported to DNS so that the next
     // time we will use a different address if available.
     if (mState == STATE_CONNECTING && mDNSRecord) {
         mDNSRecord->ReportUnusable(SocketPort());
     }
     // can only recover from these errors
     if (mCondition != NS_ERROR_CONNECTION_REFUSED &&
         mCondition != NS_ERROR_PROXY_CONNECTION_REFUSED &&
         mCondition != NS_ERROR_NET_TIMEOUT &&
         mCondition != NS_ERROR_UNKNOWN_HOST &&
         mCondition != NS_ERROR_UNKNOWN_PROXY_HOST)
         return false;
     bool tryAgain = false;
     if (mConnectionFlags & (DISABLE_IPV6 | DISABLE_IPV4) &&
         mCondition == NS_ERROR_UNKNOWN_HOST &&
         mState == STATE_RESOLVING &&
         !mProxyTransparentResolvesHost) {
         SOCKET_LOG(("  trying lookup again with both ipv4/ipv6 enabled\n"));
         mConnectionFlags &= ~(DISABLE_IPV6 | DISABLE_IPV4);
         tryAgain = true;
     }
     // try next ip address only if past the resolver stage...
     if (mState == STATE_CONNECTING && mDNSRecord) {
         nsresult rv = mDNSRecord->GetNextAddr(SocketPort(), &mNetAddr);
         if (NS_SUCCEEDED(rv)) {
             SOCKET_LOG(("  trying again with next ip address\n"));
             tryAgain = true;
         }
         else if (mConnectionFlags & (DISABLE_IPV6 | DISABLE_IPV4)) {
             // Drop state to closed.  This will trigger new round of DNS
             // resolving bellow.
             // XXX Could be optimized to only switch the flags to save duplicate
             // connection attempts.
             SOCKET_LOG(("  failed to connect all ipv4-only or ipv6-only hosts,"
                         " trying lookup/connect again with both ipv4/ipv6\n"));
             mState = STATE_CLOSED;
             mConnectionFlags &= ~(DISABLE_IPV6 | DISABLE_IPV4);
             tryAgain = true;
         }
     }
 #if defined(XP_WIN)
     // If not trying next address, try to make a connection using dialup.
     // Retry if that connection is made.
     if (!tryAgain) {
         bool autodialEnabled;
         mSocketTransportService->GetAutodialEnabled(&autodialEnabled);
         if (autodialEnabled) {
           tryAgain = nsNativeConnectionHelper::OnConnectionFailed(
                        NS_ConvertUTF8toUTF16(SocketHost()).get());
 	    }
     }
 #endif
     // prepare to try again.
     if (tryAgain) {
         uint32_t msg;
         if (mState == STATE_CONNECTING) {
             mState = STATE_RESOLVING;
             msg = MSG_DNS_LOOKUP_COMPLETE;
         }
         else {
             mState = STATE_CLOSED;
             msg = MSG_ENSURE_CONNECT;
         }
         rv = PostEvent(msg, NS_OK);
         if (NS_FAILED(rv))
             tryAgain = false;
     }
     return tryAgain;
 }
 // called on the socket thread only
 void
 nsSocketTransport::OnMsgInputClosed(nsresult reason)
 {
     SOCKET_LOG(("nsSocketTransport::OnMsgInputClosed [this=%p reason=%x]\n",
         this, reason));
     NS_ASSERTION(PR_GetCurrentThread() == gSocketThread, "wrong thread");
     mInputClosed = true;
     // check if event should affect entire transport
     if (NS_FAILED(reason) && (reason != NS_BASE_STREAM_CLOSED))
         mCondition = reason;                // XXX except if NS_FAILED(mCondition), right??
     else if (mOutputClosed)
         mCondition = NS_BASE_STREAM_CLOSED; // XXX except if NS_FAILED(mCondition), right??
     else {
         if (mState == STATE_TRANSFERRING)
             mPollFlags &= ~PR_POLL_READ;
         mInput.OnSocketReady(reason);
     }
 }
 // called on the socket thread only
 void
 nsSocketTransport::OnMsgOutputClosed(nsresult reason)
 {
     SOCKET_LOG(("nsSocketTransport::OnMsgOutputClosed [this=%p reason=%x]\n",
         this, reason));
     NS_ASSERTION(PR_GetCurrentThread() == gSocketThread, "wrong thread");
     mOutputClosed = true;
     // check if event should affect entire transport
     if (NS_FAILED(reason) && (reason != NS_BASE_STREAM_CLOSED))
         mCondition = reason;                // XXX except if NS_FAILED(mCondition), right??
     else if (mInputClosed)
         mCondition = NS_BASE_STREAM_CLOSED; // XXX except if NS_FAILED(mCondition), right??
     else {
         if (mState == STATE_TRANSFERRING)
             mPollFlags &= ~PR_POLL_WRITE;
         mOutput.OnSocketReady(reason);
     }
 }
 void
 nsSocketTransport::OnSocketConnected()
 {
     SOCKET_LOG(("  advancing to STATE_TRANSFERRING\n"));
     mPollFlags = (PR_POLL_READ | PR_POLL_WRITE | PR_POLL_EXCEPT);
     mPollTimeout = mTimeouts[TIMEOUT_READ_WRITE];
     mState = STATE_TRANSFERRING;
     // Set the mNetAddrIsSet flag only when state has reached TRANSFERRING
     // because we need to make sure its value does not change due to failover
     mNetAddrIsSet = true;
     // assign mFD (must do this within the transport lock), but take care not
     // to trample over mFDref if mFD is already set.
     {
         MutexAutoLock lock(mLock);
         NS_ASSERTION(mFD.IsInitialized(), "no socket");
         NS_ASSERTION(mFDref == 1, "wrong socket ref count");
         mFDconnected = true;
     }
     // Ensure keepalive is configured correctly if previously enabled.
     if (mKeepaliveEnabled) {
         nsresult rv = SetKeepaliveEnabledInternal(true);
         if (NS_WARN_IF(NS_FAILED(rv))) {
             SOCKET_LOG(("  SetKeepaliveEnabledInternal failed rv[0x%x]", rv));
         }
     }
     MOZ_EVENT_TRACER_DONE(this, "net::tcp::connect");
     SendStatus(NS_NET_STATUS_CONNECTED_TO);
 }
 PRFileDesc *
 nsSocketTransport::GetFD_Locked()
 {
     mLock.AssertCurrentThreadOwns();
     // mFD is not available to the streams while disconnected.
     if (!mFDconnected)
         return nullptr;
     if (mFD.IsInitialized())
         mFDref++;
     return mFD;
 }
 class ThunkPRClose : public nsRunnable
 {
 public:
   ThunkPRClose(PRFileDesc *fd) : mFD(fd) {}
   NS_IMETHOD Run()
   {
     PR_Close(mFD);
     return NS_OK;
   }
 private:
   PRFileDesc *mFD;
 };
 void
 STS_PRCloseOnSocketTransport(PRFileDesc *fd)
 {
   if (gSocketTransportService) {
     // Can't PR_Close() a socket off STS thread. Thunk it to STS to die
     // FIX - Should use RUN_ON_THREAD once it's generally available
     // RUN_ON_THREAD(gSocketThread,WrapRunnableNM(&PR_Close, mFD);
     gSocketTransportService->Dispatch(new ThunkPRClose(fd), NS_DISPATCH_NORMAL);
   } else {
     // something horrible has happened
     NS_ASSERTION(gSocketTransportService, "No STS service");
   }
 }
 void
 nsSocketTransport::ReleaseFD_Locked(PRFileDesc *fd)
 {
     mLock.AssertCurrentThreadOwns();
     NS_ASSERTION(mFD == fd, "wrong fd");
     SOCKET_LOG(("JIMB: ReleaseFD_Locked: mFDref = %d\n", mFDref));
     if (--mFDref == 0) {
         if (PR_GetCurrentThread() == gSocketThread) {
             SOCKET_LOG(("nsSocketTransport: calling PR_Close [this=%p]\n", this));
             PR_Close(mFD);
         } else {
             // Can't PR_Close() a socket off STS thread. Thunk it to STS to die
             STS_PRCloseOnSocketTransport(mFD);
         }
         mFD = nullptr;
     }
 }
 //-----------------------------------------------------------------------------
 // socket event handler impl
 void
 nsSocketTransport::OnSocketEvent(uint32_t type, nsresult status, nsISupports *param)
 {
     SOCKET_LOG(("nsSocketTransport::OnSocketEvent [this=%p type=%u status=%x param=%p]\n",
         this, type, status, param));
     if (NS_FAILED(mCondition)) {
         // block event since we're apparently already dead.
         SOCKET_LOG(("  blocking event [condition=%x]\n", mCondition));
         //
         // notify input/output streams in case either has a pending notify.
         //
         mInput.OnSocketReady(mCondition);
         mOutput.OnSocketReady(mCondition);
         return;
     }
     switch (type) {
     case MSG_ENSURE_CONNECT:
         SOCKET_LOG(("  MSG_ENSURE_CONNECT\n"));
         //
         // ensure that we have created a socket, attached it, and have a
         // connection.
         //
         if (mState == STATE_CLOSED) {
             // Unix domain sockets are ready to connect; mNetAddr is all we
             // need. Internet address families require a DNS lookup (or possibly
             // several) before we can connect.
 #if defined(XP_UNIX)
             if (mNetAddrIsSet && mNetAddr.raw.family == AF_LOCAL)
                 mCondition = InitiateSocket();
             else
 #endif
                 mCondition = ResolveHost();
         } else {
             SOCKET_LOG(("  ignoring redundant event\n"));
         }
         break;
     case MSG_DNS_LOOKUP_COMPLETE:
         if (mDNSRequest)  // only send this if we actually resolved anything
             SendStatus(NS_NET_STATUS_RESOLVED_HOST);
         SOCKET_LOG(("  MSG_DNS_LOOKUP_COMPLETE\n"));
         mDNSRequest = 0;
         if (param) {
             mDNSRecord = static_cast<nsIDNSRecord *>(param);
             mDNSRecord->GetNextAddr(SocketPort(), &mNetAddr);
         }
         // status contains DNS lookup status
         if (NS_FAILED(status)) {
             // When using a HTTP proxy, NS_ERROR_UNKNOWN_HOST means the HTTP
             // proxy host is not found, so we fixup the error code.
             // For SOCKS proxies (mProxyTransparent == true), the socket
             // transport resolves the real host here, so there's no fixup
             // (see bug 226943).
             if (status == NS_ERROR_UNKNOWN_HOST && !mProxyTransparent &&
                 mProxyUse)
                 mCondition = NS_ERROR_UNKNOWN_PROXY_HOST;
             else
                 mCondition = status;
         }
         else if (mState == STATE_RESOLVING)
             mCondition = InitiateSocket();
         break;
     case MSG_RETRY_INIT_SOCKET:
         mCondition = InitiateSocket();
         break;
     case MSG_INPUT_CLOSED:
         SOCKET_LOG(("  MSG_INPUT_CLOSED\n"));
         OnMsgInputClosed(status);
         break;
     case MSG_INPUT_PENDING:
         SOCKET_LOG(("  MSG_INPUT_PENDING\n"));
         OnMsgInputPending();
         break;
     case MSG_OUTPUT_CLOSED:
         SOCKET_LOG(("  MSG_OUTPUT_CLOSED\n"));
         OnMsgOutputClosed(status);
         break;
     case MSG_OUTPUT_PENDING:
         SOCKET_LOG(("  MSG_OUTPUT_PENDING\n"));
         OnMsgOutputPending();
         break;
     case MSG_TIMEOUT_CHANGED:
         SOCKET_LOG(("  MSG_TIMEOUT_CHANGED\n"));
         mPollTimeout = mTimeouts[(mState == STATE_TRANSFERRING)
           ? TIMEOUT_READ_WRITE : TIMEOUT_CONNECT];
         break;
     default:
         SOCKET_LOG(("  unhandled event!\n"));
     }
     if (NS_FAILED(mCondition)) {
         SOCKET_LOG(("  after event [this=%p cond=%x]\n", this, mCondition));
         if (!mAttached) // need to process this error ourselves...
             OnSocketDetached(nullptr);
     }
     else if (mPollFlags == PR_POLL_EXCEPT)
         mPollFlags = 0; // make idle
 }
 //-----------------------------------------------------------------------------
 // socket handler impl
 void
 nsSocketTransport::OnSocketReady(PRFileDesc *fd, int16_t outFlags)
 {
     SOCKET_LOG(("nsSocketTransport::OnSocketReady [this=%p outFlags=%hd]\n",
         this, outFlags));
     if (outFlags == -1) {
         SOCKET_LOG(("socket timeout expired\n"));
         mCondition = NS_ERROR_NET_TIMEOUT;
         return;
     }
     if (mState == STATE_TRANSFERRING) {
         // if waiting to write and socket is writable or hit an exception.
         if ((mPollFlags & PR_POLL_WRITE) && (outFlags & ~PR_POLL_READ)) {
             // assume that we won't need to poll any longer (the stream will
             // request that we poll again if it is still pending).
             mPollFlags &= ~PR_POLL_WRITE;
             mOutput.OnSocketReady(NS_OK);
         }
         // if waiting to read and socket is readable or hit an exception.
         if ((mPollFlags & PR_POLL_READ) && (outFlags & ~PR_POLL_WRITE)) {
             // assume that we won't need to poll any longer (the stream will
             // request that we poll again if it is still pending).
             mPollFlags &= ~PR_POLL_READ;
             mInput.OnSocketReady(NS_OK);
         }
         // Update poll timeout in case it was changed
         mPollTimeout = mTimeouts[TIMEOUT_READ_WRITE];
     }
 //STATE_SENDINGGET: handshake proceeded to state "sent connect"
 //one more poll to OnSocketReady will trigger the get request, and state STATE_SENTGET
 //STATE_SENTGET: continue and finish handshake
     else if (mState == STATE_SENDINGGET) {
         if ((mPollFlags & PR_POLL_WRITE) && (outFlags & ~PR_POLL_READ)) {
             mOutput.OnSocketReady(NS_OK);
         }
         mPollTimeout = mTimeouts[TIMEOUT_READ_WRITE];
         mState = STATE_SENTGET;
     }
     else if (mState == STATE_CONNECTING || mState == STATE_SENTGET) {
         PRStatus status = PR_ConnectContinue(fd, outFlags);
         if (status == PR_SUCCESS && mState == STATE_CONNECTING) {
             OnSocketConnected();
             mState = STATE_SENDINGGET;
         }
         else if (status == PR_SUCCESS && mState == STATE_SENTGET) {
             //
             // we are connected!
             //
             OnSocketConnected();
         }
         else {
             PRErrorCode code = PR_GetError();
 #if defined(TEST_CONNECT_ERRORS)
             code = RandomizeConnectError(code);
 #endif
             //
             // If the connect is still not ready, then continue polling...
             //
             if ((PR_WOULD_BLOCK_ERROR == code) || (PR_IN_PROGRESS_ERROR == code)) {
                 // Set up the select flags for connect...
                 mPollFlags = (PR_POLL_EXCEPT | PR_POLL_WRITE);
                 // Update poll timeout in case it was changed
                 mPollTimeout = mTimeouts[TIMEOUT_CONNECT];
             }
             //
             // The SOCKS proxy rejected our request. Find out why.
             //
             else if (PR_UNKNOWN_ERROR == code &&
                      mProxyUse && mProxyTransparent) {
                 code = PR_GetOSError();
                 mCondition = ErrorAccordingToNSPR(code);
             }
             else {
                 //
                 // else, the connection failed...
                 //
                 mCondition = ErrorAccordingToNSPR(code);
                 if (mCondition == NS_ERROR_CONNECTION_REFUSED && mProxyUse)
                     mCondition = NS_ERROR_PROXY_CONNECTION_REFUSED;
                 SOCKET_LOG(("  connection failed! [reason=%x]\n", mCondition));
             }
         }
     }
     else {
         NS_ERROR("unexpected socket state");
         mCondition = NS_ERROR_UNEXPECTED;
     }
     if (mPollFlags == PR_POLL_EXCEPT)
         mPollFlags = 0; // make idle
 }
 // called on the socket thread only
 void
 nsSocketTransport::OnSocketDetached(PRFileDesc *fd)
 {
     SOCKET_LOG(("nsSocketTransport::OnSocketDetached [this=%p cond=%x]\n",
         this, mCondition));
     NS_ASSERTION(PR_GetCurrentThread() == gSocketThread, "wrong thread");
     // if we didn't initiate this detach, then be sure to pass an error
     // condition up to our consumers.  (e.g., STS is shutting down.)
     if (NS_SUCCEEDED(mCondition)) {
         if (gIOService->IsOffline()) {
           mCondition = NS_ERROR_OFFLINE;
         }
         else {
           mCondition = NS_ERROR_ABORT;
         }
     }
     if (RecoverFromError())
         mCondition = NS_OK;
     else {
         mState = STATE_CLOSED;
         // make sure there isn't any pending DNS request
         if (mDNSRequest) {
             mDNSRequest->Cancel(NS_ERROR_ABORT);
             mDNSRequest = 0;
         }
         //
         // notify input/output streams
         //
         mInput.OnSocketReady(mCondition);
         mOutput.OnSocketReady(mCondition);
     }
     // break any potential reference cycle between the security info object
     // and ourselves by resetting its notification callbacks object.  see
     // bug 285991 for details.
     nsCOMPtr<nsISSLSocketControl> secCtrl = do_QueryInterface(mSecInfo);
     if (secCtrl)
         secCtrl->SetNotificationCallbacks(nullptr);
     // finally, release our reference to the socket (must do this within
     // the transport lock) possibly closing the socket. Also release our
     // listeners to break potential refcount cycles.
     // We should be careful not to release mEventSink and mCallbacks while
     // we're locked, because releasing it might require acquiring the lock
     // again, so we just null out mEventSink and mCallbacks while we're
     // holding the lock, and let the stack based objects' destuctors take
     // care of destroying it if needed.
     nsCOMPtr<nsIInterfaceRequestor> ourCallbacks;
     nsCOMPtr<nsITransportEventSink> ourEventSink;
     {
         MutexAutoLock lock(mLock);
         if (mFD.IsInitialized()) {
             ReleaseFD_Locked(mFD);
             // flag mFD as unusable; this prevents other consumers from
             // acquiring a reference to mFD.
             mFDconnected = false;
         }
         // We must release mCallbacks and mEventSink to avoid memory leak
         // but only when RecoverFromError() above failed. Otherwise we lose
         // link with UI and security callbacks on next connection attempt
         // round. That would lead e.g. to a broken certificate exception page.
         if (NS_FAILED(mCondition)) {
             mCallbacks.swap(ourCallbacks);
             mEventSink.swap(ourEventSink);
         }
     }
 }
 void
 nsSocketTransport::IsLocal(bool *aIsLocal)
 {
     {
         MutexAutoLock lock(mLock);
 #if defined(XP_UNIX)
         // Unix-domain sockets are always local.
         if (mNetAddr.raw.family == PR_AF_LOCAL)
         {
             *aIsLocal = true;
             return;
         }
 #endif
         *aIsLocal = IsLoopBackAddress(&mNetAddr);
     }
 }
 //-----------------------------------------------------------------------------
 // xpcom api
 NS_IMPL_ISUPPORTS(nsSocketTransport,
                   nsISocketTransport,
                   nsITransport,
                   nsIDNSListener,
                   nsIClassInfo)
 NS_IMPL_CI_INTERFACE_GETTER(nsSocketTransport,
                             nsISocketTransport,
                             nsITransport,
                             nsIDNSListener)
 NS_IMETHODIMP
 nsSocketTransport::OpenInputStream(uint32_t flags,
                                    uint32_t segsize,
                                    uint32_t segcount,
                                    nsIInputStream **result)
 {
     SOCKET_LOG(("nsSocketTransport::OpenInputStream [this=%p flags=%x]\n",
         this, flags));
     NS_ENSURE_TRUE(!mInput.IsReferenced(), NS_ERROR_UNEXPECTED);
     nsresult rv;
     nsCOMPtr<nsIAsyncInputStream> pipeIn;
     if (!(flags & OPEN_UNBUFFERED) || (flags & OPEN_BLOCKING)) {
         // XXX if the caller wants blocking, then the caller also gets buffered!
         //bool openBuffered = !(flags & OPEN_UNBUFFERED);
         bool openBlocking =  (flags & OPEN_BLOCKING);
         net_ResolveSegmentParams(segsize, segcount);
         // create a pipe
         nsCOMPtr<nsIAsyncOutputStream> pipeOut;
         rv = NS_NewPipe2(getter_AddRefs(pipeIn), getter_AddRefs(pipeOut),
                          !openBlocking, true, segsize, segcount);
         if (NS_FAILED(rv)) return rv;
         // async copy from socket to pipe
         rv = NS_AsyncCopy(&mInput, pipeOut, mSocketTransportService,
                           NS_ASYNCCOPY_VIA_WRITESEGMENTS, segsize);
         if (NS_FAILED(rv)) return rv;
         *result = pipeIn;
     }
     else
         *result = &mInput;
     // flag input stream as open
     mInputClosed = false;
     rv = PostEvent(MSG_ENSURE_CONNECT);
     if (NS_FAILED(rv)) return rv;
     NS_ADDREF(*result);
     return NS_OK;
 }
 NS_IMETHODIMP
 nsSocketTransport::OpenOutputStream(uint32_t flags,
                                     uint32_t segsize,
                                     uint32_t segcount,
                                     nsIOutputStream **result)
 {
     SOCKET_LOG(("nsSocketTransport::OpenOutputStream [this=%p flags=%x]\n",
         this, flags));
     NS_ENSURE_TRUE(!mOutput.IsReferenced(), NS_ERROR_UNEXPECTED);
     nsresult rv;
     nsCOMPtr<nsIAsyncOutputStream> pipeOut;
     if (!(flags & OPEN_UNBUFFERED) || (flags & OPEN_BLOCKING)) {
         // XXX if the caller wants blocking, then the caller also gets buffered!
         //bool openBuffered = !(flags & OPEN_UNBUFFERED);
         bool openBlocking =  (flags & OPEN_BLOCKING);
         net_ResolveSegmentParams(segsize, segcount);
         // create a pipe
         nsCOMPtr<nsIAsyncInputStream> pipeIn;
         rv = NS_NewPipe2(getter_AddRefs(pipeIn), getter_AddRefs(pipeOut),
                          true, !openBlocking, segsize, segcount);
         if (NS_FAILED(rv)) return rv;
         // async copy from socket to pipe
         rv = NS_AsyncCopy(pipeIn, &mOutput, mSocketTransportService,
                           NS_ASYNCCOPY_VIA_READSEGMENTS, segsize);
         if (NS_FAILED(rv)) return rv;
         *result = pipeOut;
     }
     else
         *result = &mOutput;
     // flag output stream as open
     mOutputClosed = false;
     rv = PostEvent(MSG_ENSURE_CONNECT);
     if (NS_FAILED(rv)) return rv;
     NS_ADDREF(*result);
     return NS_OK;
 }
 NS_IMETHODIMP
 nsSocketTransport::Close(nsresult reason)
 {
     if (NS_SUCCEEDED(reason))
         reason = NS_BASE_STREAM_CLOSED;
     mInput.CloseWithStatus(reason);
     mOutput.CloseWithStatus(reason);
     return NS_OK;
 }
 NS_IMETHODIMP
 nsSocketTransport::GetSecurityInfo(nsISupports **secinfo)
 {
     MutexAutoLock lock(mLock);
     NS_IF_ADDREF(*secinfo = mSecInfo);
     return NS_OK;
 }
 NS_IMETHODIMP
 nsSocketTransport::GetSecurityCallbacks(nsIInterfaceRequestor **callbacks)
 {
     MutexAutoLock lock(mLock);
     NS_IF_ADDREF(*callbacks = mCallbacks);
     return NS_OK;
 }
 NS_IMETHODIMP
 nsSocketTransport::SetSecurityCallbacks(nsIInterfaceRequestor *callbacks)
 {
     nsCOMPtr<nsIInterfaceRequestor> threadsafeCallbacks;
     NS_NewNotificationCallbacksAggregation(callbacks, nullptr,
                                            NS_GetCurrentThread(),
                                            getter_AddRefs(threadsafeCallbacks));
     nsCOMPtr<nsISupports> secinfo;
     {
         MutexAutoLock lock(mLock);
         mCallbacks = threadsafeCallbacks;
         SOCKET_LOG(("Reset callbacks for secinfo=%p callbacks=%p\n",
                     mSecInfo.get(), mCallbacks.get()));
         secinfo = mSecInfo;
     }
     // don't call into PSM while holding mLock!!
     nsCOMPtr<nsISSLSocketControl> secCtrl(do_QueryInterface(secinfo));
     if (secCtrl)
         secCtrl->SetNotificationCallbacks(threadsafeCallbacks);
     return NS_OK;
 }
 NS_IMETHODIMP
 nsSocketTransport::SetEventSink(nsITransportEventSink *sink,
                                 nsIEventTarget *target)
 {
     nsCOMPtr<nsITransportEventSink> temp;
     if (target) {
         nsresult rv = net_NewTransportEventSinkProxy(getter_AddRefs(temp),
                                                      sink, target);
         if (NS_FAILED(rv))
             return rv;
         sink = temp.get();
     }
     MutexAutoLock lock(mLock);
     mEventSink = sink;
     return NS_OK;
 }
 NS_IMETHODIMP
 nsSocketTransport::IsAlive(bool *result)
 {
     *result = false;
     nsresult conditionWhileLocked = NS_OK;
     PRFileDescAutoLock fd(this, &conditionWhileLocked);
     if (NS_FAILED(conditionWhileLocked) || !fd.IsInitialized()) {
         return NS_OK;
     }
     // XXX do some idle-time based checks??
     char c;
     int32_t rval = PR_Recv(fd, &c, 1, PR_MSG_PEEK, 0);
     if ((rval > 0) || (rval < 0 && PR_GetError() == PR_WOULD_BLOCK_ERROR))
         *result = true;
     return NS_OK;
 }
 NS_IMETHODIMP
 nsSocketTransport::GetHost(nsACString &host)
 {
     host = SocketHost();
     return NS_OK;
 }
 NS_IMETHODIMP
 nsSocketTransport::GetPort(int32_t *port)
 {
     *port = (int32_t) SocketPort();
     return NS_OK;
 }
 const nsCString &
 nsSocketTransport::SocketHost()
 {
   if (mProxyInfo && !mProxyTransparent) {
     if (mProxyHostCache.IsEmpty()) {
       mProxyInfo->GetHost(mProxyHostCache);
     }
     return mProxyHostCache;
   }
   else
     return mHost;
 }
 uint16_t
 nsSocketTransport::SocketPort()
 {
   if (mProxyInfo && !mProxyTransparent) {
     int32_t result;
     mProxyInfo->GetPort(&result);
     return (uint16_t) result;
   }
   else
     return mPort;
 }
 NS_IMETHODIMP
 nsSocketTransport::GetPeerAddr(NetAddr *addr)
 {
     // once we are in the connected state, mNetAddr will not change.
     // so if we can verify that we are in the connected state, then
     // we can freely access mNetAddr from any thread without being
     // inside a critical section.
     if (!mNetAddrIsSet) {
         SOCKET_LOG(("nsSocketTransport::GetPeerAddr [this=%p state=%d] "
                     "NOT_AVAILABLE because not yet connected.", this, mState));
         return NS_ERROR_NOT_AVAILABLE;
     }
     memcpy(addr, &mNetAddr, sizeof(NetAddr));
     return NS_OK;
 }
 NS_IMETHODIMP
 nsSocketTransport::GetSelfAddr(NetAddr *addr)
 {
     // we must not call any PR methods on our file descriptor
     // while holding mLock since those methods might re-enter
     // socket transport code.
     PRFileDescAutoLock fd(this);
     if (!fd.IsInitialized()) {
         return NS_ERROR_NOT_CONNECTED;
     }
     PRNetAddr prAddr;
     // NSPR doesn't tell us the socket address's length (as provided by
     // the 'getsockname' system call), so we can't distinguish between
     // named, unnamed, and abstract Unix domain socket names. (Server
     // sockets are never unnamed, obviously, but client sockets can use
     // any kind of address.) Clear prAddr first, so that the path for
     // unnamed and abstract addresses will at least be reliably empty,
     // and not garbage for unnamed sockets.
     memset(&prAddr, 0, sizeof(prAddr));
     nsresult rv =
         (PR_GetSockName(fd, &prAddr) == PR_SUCCESS) ? NS_OK : NS_ERROR_FAILURE;
     PRNetAddrToNetAddr(&prAddr, addr);
     return rv;
 }
 /* nsINetAddr getScriptablePeerAddr (); */
 NS_IMETHODIMP
 nsSocketTransport::GetScriptablePeerAddr(nsINetAddr * *addr)
 {
     NetAddr rawAddr;
     nsresult rv;
     rv = GetPeerAddr(&rawAddr);
     if (NS_FAILED(rv))
         return rv;
     NS_ADDREF(*addr = new nsNetAddr(&rawAddr));
     return NS_OK;
 }
 /* nsINetAddr getScriptableSelfAddr (); */
 NS_IMETHODIMP
 nsSocketTransport::GetScriptableSelfAddr(nsINetAddr * *addr)
 {
     NetAddr rawAddr;
     nsresult rv;
     rv = GetSelfAddr(&rawAddr);
     if (NS_FAILED(rv))
         return rv;
     NS_ADDREF(*addr = new nsNetAddr(&rawAddr));
     return NS_OK;
 }
 NS_IMETHODIMP
 nsSocketTransport::GetTimeout(uint32_t type, uint32_t *value)
 {
     NS_ENSURE_ARG_MAX(type, nsISocketTransport::TIMEOUT_READ_WRITE);
     *value = (uint32_t) mTimeouts[type];
     return NS_OK;
 }
 NS_IMETHODIMP
 nsSocketTransport::SetTimeout(uint32_t type, uint32_t value)
 {
     NS_ENSURE_ARG_MAX(type, nsISocketTransport::TIMEOUT_READ_WRITE);
     // truncate overly large timeout values.
     mTimeouts[type] = (uint16_t) std::min<uint32_t>(value, UINT16_MAX);
     PostEvent(MSG_TIMEOUT_CHANGED);
     return NS_OK;
 }
 NS_IMETHODIMP
 nsSocketTransport::SetQoSBits(uint8_t aQoSBits)
 {
     // Don't do any checking here of bits.  Why?  Because as of RFC-4594
     // several different Class Selector and Assured Forwarding values
     // have been defined, but that isn't to say more won't be added later.
     // In that case, any checking would be an impediment to interoperating
     // with newer QoS definitions.
     mQoSBits = aQoSBits;
     return NS_OK;
 }
 NS_IMETHODIMP
 nsSocketTransport::GetQoSBits(uint8_t *aQoSBits)
 {
     *aQoSBits = mQoSBits;
     return NS_OK;
 }
 NS_IMETHODIMP
 nsSocketTransport::GetRecvBufferSize(uint32_t *aSize)
 {
     PRFileDescAutoLock fd(this);
     if (!fd.IsInitialized())
         return NS_ERROR_NOT_CONNECTED;
     nsresult rv = NS_OK;
     PRSocketOptionData opt;
     opt.option = PR_SockOpt_RecvBufferSize;
     if (PR_GetSocketOption(fd, &opt) == PR_SUCCESS)
         *aSize = opt.value.recv_buffer_size;
     else
         rv = NS_ERROR_FAILURE;
     return rv;
 }
 NS_IMETHODIMP
 nsSocketTransport::GetSendBufferSize(uint32_t *aSize)
 {
     PRFileDescAutoLock fd(this);
     if (!fd.IsInitialized())
         return NS_ERROR_NOT_CONNECTED;
     nsresult rv = NS_OK;
     PRSocketOptionData opt;
     opt.option = PR_SockOpt_SendBufferSize;
     if (PR_GetSocketOption(fd, &opt) == PR_SUCCESS)
         *aSize = opt.value.send_buffer_size;
     else
         rv = NS_ERROR_FAILURE;
     return rv;
 }
 NS_IMETHODIMP
 nsSocketTransport::SetRecvBufferSize(uint32_t aSize)
 {
     PRFileDescAutoLock fd(this);
     if (!fd.IsInitialized())
         return NS_ERROR_NOT_CONNECTED;
     nsresult rv = NS_OK;
     PRSocketOptionData opt;
     opt.option = PR_SockOpt_RecvBufferSize;
     opt.value.recv_buffer_size = aSize;
     if (PR_SetSocketOption(fd, &opt) != PR_SUCCESS)
         rv = NS_ERROR_FAILURE;
     return rv;
 }
 NS_IMETHODIMP
 nsSocketTransport::SetSendBufferSize(uint32_t aSize)
 {
     PRFileDescAutoLock fd(this);
     if (!fd.IsInitialized())
         return NS_ERROR_NOT_CONNECTED;
     nsresult rv = NS_OK;
     PRSocketOptionData opt;
     opt.option = PR_SockOpt_SendBufferSize;
     opt.value.send_buffer_size = aSize;
     if (PR_SetSocketOption(fd, &opt) != PR_SUCCESS)
         rv = NS_ERROR_FAILURE;
     return rv;
 }
 NS_IMETHODIMP
 nsSocketTransport::OnLookupComplete(nsICancelable *request,
                                     nsIDNSRecord  *rec,
                                     nsresult       status)
 {
     // flag host lookup complete for the benefit of the ResolveHost method.
     mResolving = false;
     MOZ_EVENT_TRACER_WAIT(this, "net::tcp::connect");
     nsresult rv = PostEvent(MSG_DNS_LOOKUP_COMPLETE, status, rec);
     // if posting a message fails, then we should assume that the socket
     // transport has been shutdown.  this should never happen!  if it does
     // it means that the socket transport service was shutdown before the
     // DNS service.
     if (NS_FAILED(rv))
         NS_WARNING("unable to post DNS lookup complete message");
     return NS_OK;
 }
 NS_IMETHODIMP
 nsSocketTransport::GetInterfaces(uint32_t *count, nsIID * **array)
 {
     return NS_CI_INTERFACE_GETTER_NAME(nsSocketTransport)(count, array);
 }
 NS_IMETHODIMP
 nsSocketTransport::GetHelperForLanguage(uint32_t language, nsISupports **_retval)
 {
     *_retval = nullptr;
     return NS_OK;
 }
 NS_IMETHODIMP
 nsSocketTransport::GetContractID(char * *aContractID)
 {
     *aContractID = nullptr;
     return NS_OK;
 }
 NS_IMETHODIMP
 nsSocketTransport::GetClassDescription(char * *aClassDescription)
 {
     *aClassDescription = nullptr;
     return NS_OK;
 }
 NS_IMETHODIMP
 nsSocketTransport::GetClassID(nsCID * *aClassID)
 {
     *aClassID = nullptr;
     return NS_OK;
 }
 NS_IMETHODIMP
 nsSocketTransport::GetImplementationLanguage(uint32_t *aImplementationLanguage)
 {
     *aImplementationLanguage = nsIProgrammingLanguage::CPLUSPLUS;
     return NS_OK;
 }
 NS_IMETHODIMP
 nsSocketTransport::GetFlags(uint32_t *aFlags)
 {
     *aFlags = nsIClassInfo::THREADSAFE;
     return NS_OK;
 }
 NS_IMETHODIMP
 nsSocketTransport::GetClassIDNoAlloc(nsCID *aClassIDNoAlloc)
 {
     return NS_ERROR_NOT_AVAILABLE;
 }
 NS_IMETHODIMP
 nsSocketTransport::GetConnectionFlags(uint32_t *value)
 {
     *value = mConnectionFlags;
     return NS_OK;
 }
 NS_IMETHODIMP
 nsSocketTransport::SetConnectionFlags(uint32_t value)
 {
     mConnectionFlags = value;
     mIsPrivate = value & nsISocketTransport::NO_PERMANENT_STORAGE;
     return NS_OK;
 }
 void
 nsSocketTransport::OnKeepaliveEnabledPrefChange(bool aEnabled)
 {
     MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread, "wrong thread");
     // The global pref toggles keepalive as a system feature; it only affects
     // an individual socket if keepalive has been specifically enabled for it.
     // So, ensure keepalive is configured correctly if previously enabled.
     if (mKeepaliveEnabled) {
         nsresult rv = SetKeepaliveEnabledInternal(aEnabled);
         if (NS_WARN_IF(NS_FAILED(rv))) {
             SOCKET_LOG(("  SetKeepaliveEnabledInternal [%s] failed rv[0x%x]",
                         aEnabled ? "enable" : "disable", rv));
         }
     }
 }
 nsresult
 nsSocketTransport::SetKeepaliveEnabledInternal(bool aEnable)
 {
     MOZ_ASSERT(mKeepaliveIdleTimeS > 0 &&
                mKeepaliveIdleTimeS <= kMaxTCPKeepIdle);
     MOZ_ASSERT(mKeepaliveRetryIntervalS > 0 &&
                mKeepaliveRetryIntervalS <= kMaxTCPKeepIntvl);
     MOZ_ASSERT(mKeepaliveProbeCount > 0 &&
                mKeepaliveProbeCount <= kMaxTCPKeepCount);
     PRFileDescAutoLock fd(this);
     if (NS_WARN_IF(!fd.IsInitialized())) {
         return NS_ERROR_NOT_INITIALIZED;
     }
     // Only enable if keepalives are globally enabled, but ensure other
     // options are set correctly on the fd.
     bool enable = aEnable && mSocketTransportService->IsKeepaliveEnabled();
     nsresult rv = fd.SetKeepaliveVals(enable,
                                       mKeepaliveIdleTimeS,
                                       mKeepaliveRetryIntervalS,
                                       mKeepaliveProbeCount);
     if (NS_WARN_IF(NS_FAILED(rv))) {
         SOCKET_LOG(("  SetKeepaliveVals failed rv[0x%x]", rv));
         return rv;
     }
     rv = fd.SetKeepaliveEnabled(enable);
     if (NS_WARN_IF(NS_FAILED(rv))) {
         SOCKET_LOG(("  SetKeepaliveEnabled failed rv[0x%x]", rv));
         return rv;
     }
     return NS_OK;
 }
 NS_IMETHODIMP
 nsSocketTransport::GetKeepaliveEnabled(bool *aResult)
 {
     MOZ_ASSERT(aResult);
     *aResult = mKeepaliveEnabled;
     return NS_OK;
 }
 nsresult
 nsSocketTransport::EnsureKeepaliveValsAreInitialized()
 {
     nsresult rv = NS_OK;
     int32_t val = -1;
     if (mKeepaliveIdleTimeS == -1) {
         rv = mSocketTransportService->GetKeepaliveIdleTime(&val);
         if (NS_WARN_IF(NS_FAILED(rv))) {
             return rv;
         }
         mKeepaliveIdleTimeS = val;
     }
     if (mKeepaliveRetryIntervalS == -1) {
         rv = mSocketTransportService->GetKeepaliveRetryInterval(&val);
         if (NS_WARN_IF(NS_FAILED(rv))) {
             return rv;
         }
         mKeepaliveRetryIntervalS = val;
     }
     if (mKeepaliveProbeCount == -1) {
         rv = mSocketTransportService->GetKeepaliveProbeCount(&val);
         if (NS_WARN_IF(NS_FAILED(rv))) {
             return rv;
         }
         mKeepaliveProbeCount = val;
     }
     return NS_OK;
 }
 NS_IMETHODIMP
 nsSocketTransport::SetKeepaliveEnabled(bool aEnable)
 {
 #if defined(XP_WIN) || defined(XP_UNIX) || defined(XP_MACOSX)
     MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread, "wrong thread");
     if (aEnable == mKeepaliveEnabled) {
         SOCKET_LOG(("nsSocketTransport::SetKeepaliveEnabled [%p] already %s.",
                     this, aEnable ? "enabled" : "disabled"));
         return NS_OK;
     }
     nsresult rv = NS_OK;
     if (aEnable) {
         rv = EnsureKeepaliveValsAreInitialized();
         if (NS_WARN_IF(NS_FAILED(rv))) {
             SOCKET_LOG(("  SetKeepaliveEnabled [%p] "
                         "error [0x%x] initializing keepalive vals",
                         this, rv));
             return rv;
         }
     }
     SOCKET_LOG(("nsSocketTransport::SetKeepaliveEnabled [%p] "
                 "%s, idle time[%ds] retry interval[%ds] packet count[%d]: "
                 "globally %s.",
                 this, aEnable ? "enabled" : "disabled",
                 mKeepaliveIdleTimeS, mKeepaliveRetryIntervalS,
                 mKeepaliveProbeCount,
                 mSocketTransportService->IsKeepaliveEnabled() ?
                 "enabled" : "disabled"));
     // Set mKeepaliveEnabled here so that state is maintained; it is possible
     // that we're in between fds, e.g. the 1st IP address failed, so we're about
     // to retry on a 2nd from the DNS record.
     mKeepaliveEnabled = aEnable;
     rv = SetKeepaliveEnabledInternal(aEnable);
     if (NS_WARN_IF(NS_FAILED(rv))) {
         SOCKET_LOG(("  SetKeepaliveEnabledInternal failed rv[0x%x]", rv));
         return rv;
     }
     return NS_OK;
 #else /* !(defined(XP_WIN) || defined(XP_UNIX) || defined(XP_MACOSX)) */
     SOCKET_LOG(("nsSocketTransport::SetKeepaliveEnabled unsupported platform"));
     return NS_ERROR_NOT_IMPLEMENTED;
 #endif
 }
 NS_IMETHODIMP
 nsSocketTransport::SetKeepaliveVals(int32_t aIdleTime,
                                     int32_t aRetryInterval)
 {
 #if defined(XP_WIN) || defined(XP_UNIX) || defined(XP_MACOSX)
     MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread, "wrong thread");
     if (NS_WARN_IF(aIdleTime <= 0 || kMaxTCPKeepIdle < aIdleTime)) {
         return NS_ERROR_INVALID_ARG;
     }
     if (NS_WARN_IF(aRetryInterval <= 0 ||
                    kMaxTCPKeepIntvl < aRetryInterval)) {
         return NS_ERROR_INVALID_ARG;
     }
     if (aIdleTime == mKeepaliveIdleTimeS &&
         aRetryInterval == mKeepaliveRetryIntervalS) {
         SOCKET_LOG(("nsSocketTransport::SetKeepaliveVals [%p] idle time "
                     "already %ds and retry interval already %ds.",
                     this, mKeepaliveIdleTimeS,
                     mKeepaliveRetryIntervalS));
         return NS_OK;
     }
     mKeepaliveIdleTimeS = aIdleTime;
     mKeepaliveRetryIntervalS = aRetryInterval;
     nsresult rv = NS_OK;
     if (mKeepaliveProbeCount == -1) {
         int32_t val = -1;
         nsresult rv = mSocketTransportService->GetKeepaliveProbeCount(&val);
         if (NS_WARN_IF(NS_FAILED(rv))) {
             return rv;
         }
         mKeepaliveProbeCount = val;
     }
     SOCKET_LOG(("nsSocketTransport::SetKeepaliveVals [%p] "
                 "keepalive %s, idle time[%ds] retry interval[%ds] "
                 "packet count[%d]",
                 this, mKeepaliveEnabled ? "enabled" : "disabled",
                 mKeepaliveIdleTimeS, mKeepaliveRetryIntervalS,
                 mKeepaliveProbeCount));
     PRFileDescAutoLock fd(this);
     if (NS_WARN_IF(!fd.IsInitialized())) {
         return NS_ERROR_NULL_POINTER;
     }
     rv = fd.SetKeepaliveVals(mKeepaliveEnabled,
                              mKeepaliveIdleTimeS,
                              mKeepaliveRetryIntervalS,
                              mKeepaliveProbeCount);
     if (NS_WARN_IF(NS_FAILED(rv))) {
         return rv;
     }
     return NS_OK;
 #else
     SOCKET_LOG(("nsSocketTransport::SetKeepaliveVals unsupported platform"));
     return NS_ERROR_NOT_IMPLEMENTED;
 #endif
 }
 #ifdef ENABLE_SOCKET_TRACING
 #include <stdio.h>
 #include <ctype.h>
 #include "prenv.h"
 static void
 DumpBytesToFile(const char *path, const char *header, const char *buf, int32_t n)
 {
     FILE *fp = fopen(path, "a");
     fprintf(fp, "\n%s [%d bytes]\n", header, n);
     const unsigned char *p;
     while (n) {
         p = (const unsigned char *) buf;
         int32_t i, row_max = std::min(16, n);
         for (i = 0; i < row_max; ++i)
             fprintf(fp, "%02x  ", *p++);
         for (i = row_max; i < 16; ++i)
             fprintf(fp, "    ");
         p = (const unsigned char *) buf;
         for (i = 0; i < row_max; ++i, ++p) {
             if (isprint(*p))
                 fprintf(fp, "%c", *p);
             else
                 fprintf(fp, ".");
         }
         fprintf(fp, "\n");
         buf += row_max;
         n -= row_max;
     }
     fprintf(fp, "\n");
     fclose(fp);
 }
 void
 nsSocketTransport::TraceInBuf(const char *buf, int32_t n)
 {
     char *val = PR_GetEnv("NECKO_SOCKET_TRACE_LOG");
     if (!val || !*val)
         return;
     nsAutoCString header;
     header.Assign(NS_LITERAL_CSTRING("Reading from: ") + mHost);
     header.Append(':');
     header.AppendInt(mPort);
     DumpBytesToFile(val, header.get(), buf, n);
 }
 void
 nsSocketTransport::TraceOutBuf(const char *buf, int32_t n)
 {
     char *val = PR_GetEnv("NECKO_SOCKET_TRACE_LOG");
     if (!val || !*val)
         return;
     nsAutoCString header;
     header.Assign(NS_LITERAL_CSTRING("Writing to: ") + mHost);
     header.Append(':');
     header.AppendInt(mPort);
     DumpBytesToFile(val, header.get(), buf, n);
 }
 #endif
 static void LogNSPRError(const char* aPrefix, const void *aObjPtr)
 {
 #if defined(PR_LOGGING) && defined(DEBUG)
     PRErrorCode errCode = PR_GetError();
     int errLen = PR_GetErrorTextLength();
     nsAutoCString errStr;
     if (errLen > 0) {
         errStr.SetLength(errLen);
         PR_GetErrorText(errStr.BeginWriting());
     }
     NS_WARNING(nsPrintfCString(
                "%s [%p] NSPR error[0x%x] %s.",
                aPrefix ? aPrefix : "nsSocketTransport", aObjPtr, errCode,
                errLen > 0 ? errStr.BeginReading() : "<no error text>").get());
 #endif
 }
 nsresult
 nsSocketTransport::PRFileDescAutoLock::SetKeepaliveEnabled(bool aEnable)
 {
     MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread, "wrong thread");
     MOZ_ASSERT(!(aEnable && !gSocketTransportService->IsKeepaliveEnabled()),
                "Cannot enable keepalive if global pref is disabled!");
     if (aEnable && !gSocketTransportService->IsKeepaliveEnabled()) {
         return NS_ERROR_ILLEGAL_VALUE;
     }
     PRSocketOptionData opt;
     opt.option = PR_SockOpt_Keepalive;
     opt.value.keep_alive = aEnable;
     PRStatus status = PR_SetSocketOption(mFd, &opt);
     if (NS_WARN_IF(status != PR_SUCCESS)) {
         LogNSPRError("nsSocketTransport::PRFileDescAutoLock::SetKeepaliveEnabled",
                      mSocketTransport);
         return ErrorAccordingToNSPR(PR_GetError());
     }
     return NS_OK;
 }
 static void LogOSError(const char *aPrefix, const void *aObjPtr)
 {
 #if defined(PR_LOGGING) && defined(DEBUG)
     MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread, "wrong thread");
 #ifdef XP_WIN
     DWORD errCode = WSAGetLastError();
     LPVOID errMessage;
     FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
                   FORMAT_MESSAGE_FROM_SYSTEM |
                   FORMAT_MESSAGE_IGNORE_INSERTS,
                   NULL,
                   errCode,
                   MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
                   (LPTSTR) &errMessage,
 , NULL);
 #else
     int errCode = errno;
     char *errMessage = strerror(errno);
 #endif
     NS_WARNING(nsPrintfCString(
                "%s [%p] OS error[0x%x] %s",
                aPrefix ? aPrefix : "nsSocketTransport", aObjPtr, errCode,
                errMessage ? errMessage : "<no error text>").get());
 #ifdef XP_WIN
     LocalFree(errMessage);
 #endif
 #endif
 }
 /* XXX PR_SetSockOpt does not support setting keepalive values, so native
  * handles and platform specific apis (setsockopt, WSAIOCtl) are used in this
  * file. Requires inclusion of NSPR private/pprio.h, and platform headers.
  */
 nsresult
 nsSocketTransport::PRFileDescAutoLock::SetKeepaliveVals(bool aEnabled,
                                                         int aIdleTime,
                                                         int aRetryInterval,
                                                         int aProbeCount)
 {
 #if defined(XP_WIN) || defined(XP_UNIX) || defined(XP_MACOSX)
     MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread, "wrong thread");
     if (NS_WARN_IF(aIdleTime <= 0 || kMaxTCPKeepIdle < aIdleTime)) {
         return NS_ERROR_INVALID_ARG;
     }
     if (NS_WARN_IF(aRetryInterval <= 0 ||
                    kMaxTCPKeepIntvl < aRetryInterval)) {
         return NS_ERROR_INVALID_ARG;
     }
     if (NS_WARN_IF(aProbeCount <= 0 || kMaxTCPKeepCount < aProbeCount)) {
         return NS_ERROR_INVALID_ARG;
     }
     PROsfd sock = PR_FileDesc2NativeHandle(mFd);
     if (NS_WARN_IF(sock == -1)) {
         LogNSPRError("nsSocketTransport::PRFileDescAutoLock::SetKeepaliveVals",
                      mSocketTransport);
         return ErrorAccordingToNSPR(PR_GetError());
     }
 #endif
 #if defined(XP_WIN)
     // Windows allows idle time and retry interval to be set; NOT ping count.
     struct tcp_keepalive keepalive_vals = {
         (int)aEnabled,
         // Windows uses msec.
         aIdleTime * 1000,
         aRetryInterval * 1000
     };
     DWORD bytes_returned;
     int err = WSAIoctl(sock, SIO_KEEPALIVE_VALS, &keepalive_vals,
                        sizeof(keepalive_vals), NULL, 0, &bytes_returned, NULL,
                        NULL);
     if (NS_WARN_IF(err)) {
         LogOSError("nsSocketTransport WSAIoctl failed", mSocketTransport);
         return NS_ERROR_UNEXPECTED;
     }
     return NS_OK;
 #elif defined(XP_MACOSX)
     // OS X uses sec; only supports idle time being set.
     int err = setsockopt(sock, IPPROTO_TCP, TCP_KEEPALIVE,
                          &aIdleTime, sizeof(aIdleTime));
     if (NS_WARN_IF(err)) {
         LogOSError("nsSocketTransport Failed setting TCP_KEEPALIVE",
                    mSocketTransport);
         return NS_ERROR_UNEXPECTED;
     }
     return NS_OK;
 #elif defined(XP_UNIX)
     // Not all *nix OSes support the following setsockopt() options
     // ... but we assume they are supported in the Android kernel;
     // build errors will tell us if they are not.
 #if defined(ANDROID) || defined(TCP_KEEPIDLE)
     // Idle time until first keepalive probe; interval between ack'd probes; seconds.
     int err = setsockopt(sock, IPPROTO_TCP, TCP_KEEPIDLE,
                          &aIdleTime, sizeof(aIdleTime));
     if (NS_WARN_IF(err)) {
         LogOSError("nsSocketTransport Failed setting TCP_KEEPIDLE",
                    mSocketTransport);
         return NS_ERROR_UNEXPECTED;
     }
 #endif
 #if defined(ANDROID) || defined(TCP_KEEPINTVL)
     // Interval between unack'd keepalive probes; seconds.
     err = setsockopt(sock, IPPROTO_TCP, TCP_KEEPINTVL,
                         &aRetryInterval, sizeof(aRetryInterval));
     if (NS_WARN_IF(err)) {
         LogOSError("nsSocketTransport Failed setting TCP_KEEPINTVL",
                    mSocketTransport);
         return NS_ERROR_UNEXPECTED;
     }
 #endif
 #if defined(ANDROID) || defined(TCP_KEEPCNT)
     // Number of unack'd keepalive probes before connection times out.
     err = setsockopt(sock, IPPROTO_TCP, TCP_KEEPCNT,
                      &aProbeCount, sizeof(aProbeCount));
     if (NS_WARN_IF(err)) {
         LogOSError("nsSocketTransport Failed setting TCP_KEEPCNT",
                    mSocketTransport);
         return NS_ERROR_UNEXPECTED;
     }
 #endif
     return NS_OK;
 #else
     MOZ_ASSERT(false, "nsSocketTransport::PRFileDescAutoLock::SetKeepaliveVals "
                "called on unsupported platform!");
     return NS_ERROR_UNEXPECTED;
 #endif
 }

The Tor Browser / annotate

netwerk/base/src/nsSocketTransport2.cpp@6474c204b198 (annotated)

netwerk/base/src/nsSocketTransport2.cpp