Add m-esr52 at 52.6.0

1 files changed, 1015 insertions, 0 deletions

diff --git a/netwerk/base/ProxyAutoConfig.cpp b/netwerk/base/ProxyAutoConfig.cpp
new file mode 100644
index 000000000..4d7a6c1fd
--- /dev/null
+++ b/netwerk/base/ProxyAutoConfig.cpp
@@ -0,0 +1,1015 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 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/. */
+
+#include "ProxyAutoConfig.h"
+#include "nsICancelable.h"
+#include "nsIDNSListener.h"
+#include "nsIDNSRecord.h"
+#include "nsIDNSService.h"
+#include "nsThreadUtils.h"
+#include "nsIConsoleService.h"
+#include "nsIURLParser.h"
+#include "nsJSUtils.h"
+#include "jsfriendapi.h"
+#include "prnetdb.h"
+#include "nsITimer.h"
+#include "mozilla/net/DNS.h"
+#include "nsServiceManagerUtils.h"
+#include "nsNetCID.h"
+
+namespace mozilla {
+namespace net {
+
+// These are some global helper symbols the PAC format requires that we provide that
+// are initialized as part of the global javascript context used for PAC evaluations.
+// Additionally dnsResolve(host) and myIpAddress() are supplied in the same context
+// but are implemented as c++ helpers. alert(msg) is similarly defined.
+
+static const char *sPacUtils =
+  "function dnsDomainIs(host, domain) {\n"
+  "    return (host.length >= domain.length &&\n"
+  "            host.substring(host.length - domain.length) == domain);\n"
+  "}\n"
+  ""
+  "function dnsDomainLevels(host) {\n"
+  "    return host.split('.').length - 1;\n"
+  "}\n"
+  ""
+  "function convert_addr(ipchars) {\n"
+  "    var bytes = ipchars.split('.');\n"
+  "    var result = ((bytes[0] & 0xff) << 24) |\n"
+  "                 ((bytes[1] & 0xff) << 16) |\n"
+  "                 ((bytes[2] & 0xff) <<  8) |\n"
+  "                  (bytes[3] & 0xff);\n"
+  "    return result;\n"
+  "}\n"
+  ""
+  "function isInNet(ipaddr, pattern, maskstr) {\n"
+  "    var test = /^(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})$/.exec(ipaddr);\n"
+  "    if (test == null) {\n"
+  "        ipaddr = dnsResolve(ipaddr);\n"
+  "        if (ipaddr == null)\n"
+  "            return false;\n"
+  "    } else if (test[1] > 255 || test[2] > 255 || \n"
+  "               test[3] > 255 || test[4] > 255) {\n"
+  "        return false;    // not an IP address\n"
+  "    }\n"
+  "    var host = convert_addr(ipaddr);\n"
+  "    var pat  = convert_addr(pattern);\n"
+  "    var mask = convert_addr(maskstr);\n"
+  "    return ((host & mask) == (pat & mask));\n"
+  "    \n"
+  "}\n"
+  ""
+  "function isPlainHostName(host) {\n"
+  "    return (host.search('\\\\.') == -1);\n"
+  "}\n"
+  ""
+  "function isResolvable(host) {\n"
+  "    var ip = dnsResolve(host);\n"
+  "    return (ip != null);\n"
+  "}\n"
+  ""
+  "function localHostOrDomainIs(host, hostdom) {\n"
+  "    return (host == hostdom) ||\n"
+  "           (hostdom.lastIndexOf(host + '.', 0) == 0);\n"
+  "}\n"
+  ""
+  "function shExpMatch(url, pattern) {\n"
+  "   pattern = pattern.replace(/\\./g, '\\\\.');\n"
+  "   pattern = pattern.replace(/\\*/g, '.*');\n"
+  "   pattern = pattern.replace(/\\?/g, '.');\n"
+  "   var newRe = new RegExp('^'+pattern+'$');\n"
+  "   return newRe.test(url);\n"
+  "}\n"
+  ""
+  "var wdays = {SUN: 0, MON: 1, TUE: 2, WED: 3, THU: 4, FRI: 5, SAT: 6};\n"
+  "var months = {JAN: 0, FEB: 1, MAR: 2, APR: 3, MAY: 4, JUN: 5, JUL: 6, AUG: 7, SEP: 8, OCT: 9, NOV: 10, DEC: 11};\n"
+  ""
+  "function weekdayRange() {\n"
+  "    function getDay(weekday) {\n"
+  "        if (weekday in wdays) {\n"
+  "            return wdays[weekday];\n"
+  "        }\n"
+  "        return -1;\n"
+  "    }\n"
+  "    var date = new Date();\n"
+  "    var argc = arguments.length;\n"
+  "    var wday;\n"
+  "    if (argc < 1)\n"
+  "        return false;\n"
+  "    if (arguments[argc - 1] == 'GMT') {\n"
+  "        argc--;\n"
+  "        wday = date.getUTCDay();\n"
+  "    } else {\n"
+  "        wday = date.getDay();\n"
+  "    }\n"
+  "    var wd1 = getDay(arguments[0]);\n"
+  "    var wd2 = (argc == 2) ? getDay(arguments[1]) : wd1;\n"
+  "    return (wd1 == -1 || wd2 == -1) ? false\n"
+  "                                    : (wd1 <= wd2) ? (wd1 <= wday && wday <= wd2)\n"
+  "                                                   : (wd2 >= wday || wday >= wd1);\n"
+  "}\n"
+  ""
+  "function dateRange() {\n"
+  "    function getMonth(name) {\n"
+  "        if (name in months) {\n"
+  "            return months[name];\n"
+  "        }\n"
+  "        return -1;\n"
+  "    }\n"
+  "    var date = new Date();\n"
+  "    var argc = arguments.length;\n"
+  "    if (argc < 1) {\n"
+  "        return false;\n"
+  "    }\n"
+  "    var isGMT = (arguments[argc - 1] == 'GMT');\n"
+  "\n"
+  "    if (isGMT) {\n"
+  "        argc--;\n"
+  "    }\n"
+  "    // function will work even without explict handling of this case\n"
+  "    if (argc == 1) {\n"
+  "        var tmp = parseInt(arguments[0]);\n"
+  "        if (isNaN(tmp)) {\n"
+  "            return ((isGMT ? date.getUTCMonth() : date.getMonth()) ==\n"
+  "                     getMonth(arguments[0]));\n"
+  "        } else if (tmp < 32) {\n"
+  "            return ((isGMT ? date.getUTCDate() : date.getDate()) == tmp);\n"
+  "        } else { \n"
+  "            return ((isGMT ? date.getUTCFullYear() : date.getFullYear()) ==\n"
+  "                     tmp);\n"
+  "        }\n"
+  "    }\n"
+  "    var year = date.getFullYear();\n"
+  "    var date1, date2;\n"
+  "    date1 = new Date(year,  0,  1,  0,  0,  0);\n"
+  "    date2 = new Date(year, 11, 31, 23, 59, 59);\n"
+  "    var adjustMonth = false;\n"
+  "    for (var i = 0; i < (argc >> 1); i++) {\n"
+  "        var tmp = parseInt(arguments[i]);\n"
+  "        if (isNaN(tmp)) {\n"
+  "            var mon = getMonth(arguments[i]);\n"
+  "            date1.setMonth(mon);\n"
+  "        } else if (tmp < 32) {\n"
+  "            adjustMonth = (argc <= 2);\n"
+  "            date1.setDate(tmp);\n"
+  "        } else {\n"
+  "            date1.setFullYear(tmp);\n"
+  "        }\n"
+  "    }\n"
+  "    for (var i = (argc >> 1); i < argc; i++) {\n"
+  "        var tmp = parseInt(arguments[i]);\n"
+  "        if (isNaN(tmp)) {\n"
+  "            var mon = getMonth(arguments[i]);\n"
+  "            date2.setMonth(mon);\n"
+  "        } else if (tmp < 32) {\n"
+  "            date2.setDate(tmp);\n"
+  "        } else {\n"
+  "            date2.setFullYear(tmp);\n"
+  "        }\n"
+  "    }\n"
+  "    if (adjustMonth) {\n"
+  "        date1.setMonth(date.getMonth());\n"
+  "        date2.setMonth(date.getMonth());\n"
+  "    }\n"
+  "    if (isGMT) {\n"
+  "    var tmp = date;\n"
+  "        tmp.setFullYear(date.getUTCFullYear());\n"
+  "        tmp.setMonth(date.getUTCMonth());\n"
+  "        tmp.setDate(date.getUTCDate());\n"
+  "        tmp.setHours(date.getUTCHours());\n"
+  "        tmp.setMinutes(date.getUTCMinutes());\n"
+  "        tmp.setSeconds(date.getUTCSeconds());\n"
+  "        date = tmp;\n"
+  "    }\n"
+  "    return (date1 <= date2) ? (date1 <= date) && (date <= date2)\n"
+  "                            : (date2 >= date) || (date >= date1);\n"
+  "}\n"
+  ""
+  "function timeRange() {\n"
+  "    var argc = arguments.length;\n"
+  "    var date = new Date();\n"
+  "    var isGMT= false;\n"
+  ""
+  "    if (argc < 1) {\n"
+  "        return false;\n"
+  "    }\n"
+  "    if (arguments[argc - 1] == 'GMT') {\n"
+  "        isGMT = true;\n"
+  "        argc--;\n"
+  "    }\n"
+  "\n"
+  "    var hour = isGMT ? date.getUTCHours() : date.getHours();\n"
+  "    var date1, date2;\n"
+  "    date1 = new Date();\n"
+  "    date2 = new Date();\n"
+  "\n"
+  "    if (argc == 1) {\n"
+  "        return (hour == arguments[0]);\n"
+  "    } else if (argc == 2) {\n"
+  "        return ((arguments[0] <= hour) && (hour <= arguments[1]));\n"
+  "    } else {\n"
+  "        switch (argc) {\n"
+  "        case 6:\n"
+  "            date1.setSeconds(arguments[2]);\n"
+  "            date2.setSeconds(arguments[5]);\n"
+  "        case 4:\n"
+  "            var middle = argc >> 1;\n"
+  "            date1.setHours(arguments[0]);\n"
+  "            date1.setMinutes(arguments[1]);\n"
+  "            date2.setHours(arguments[middle]);\n"
+  "            date2.setMinutes(arguments[middle + 1]);\n"
+  "            if (middle == 2) {\n"
+  "                date2.setSeconds(59);\n"
+  "            }\n"
+  "            break;\n"
+  "        default:\n"
+  "          throw 'timeRange: bad number of arguments'\n"
+  "        }\n"
+  "    }\n"
+  "\n"
+  "    if (isGMT) {\n"
+  "        date.setFullYear(date.getUTCFullYear());\n"
+  "        date.setMonth(date.getUTCMonth());\n"
+  "        date.setDate(date.getUTCDate());\n"
+  "        date.setHours(date.getUTCHours());\n"
+  "        date.setMinutes(date.getUTCMinutes());\n"
+  "        date.setSeconds(date.getUTCSeconds());\n"
+  "    }\n"
+  "    return (date1 <= date2) ? (date1 <= date) && (date <= date2)\n"
+  "                            : (date2 >= date) || (date >= date1);\n"
+  "\n"
+  "}\n"
+  "";
+
+// sRunning is defined for the helper functions only while the
+// Javascript engine is running and the PAC object cannot be deleted
+// or reset.
+static uint32_t sRunningIndex = 0xdeadbeef;
+static ProxyAutoConfig *GetRunning()
+{
+  MOZ_ASSERT(sRunningIndex != 0xdeadbeef);
+  return static_cast<ProxyAutoConfig *>(PR_GetThreadPrivate(sRunningIndex));
+}
+
+static void SetRunning(ProxyAutoConfig *arg)
+{
+  MOZ_ASSERT(sRunningIndex != 0xdeadbeef);
+  PR_SetThreadPrivate(sRunningIndex, arg);
+}
+
+// The PACResolver is used for dnsResolve()
+class PACResolver final : public nsIDNSListener
+                        , public nsITimerCallback
+{
+public:
+  NS_DECL_THREADSAFE_ISUPPORTS
+
+  PACResolver()
+    : mStatus(NS_ERROR_FAILURE)
+  {
+  }
+
+  // nsIDNSListener
+  NS_IMETHOD OnLookupComplete(nsICancelable *request,
+                              nsIDNSRecord *record,
+                              nsresult status) override
+  {
+    if (mTimer) {
+      mTimer->Cancel();
+      mTimer = nullptr;
+    }
+
+    mRequest = nullptr;
+    mStatus = status;
+    mResponse = record;
+    return NS_OK;
+  }
+
+  // nsITimerCallback
+  NS_IMETHOD Notify(nsITimer *timer) override
+  {
+    if (mRequest)
+      mRequest->Cancel(NS_ERROR_NET_TIMEOUT);
+    mTimer = nullptr;
+    return NS_OK;
+  }
+
+  nsresult                mStatus;
+  nsCOMPtr<nsICancelable> mRequest;
+  nsCOMPtr<nsIDNSRecord>  mResponse;
+  nsCOMPtr<nsITimer>      mTimer;
+
+private:
+  ~PACResolver() {}
+};
+NS_IMPL_ISUPPORTS(PACResolver, nsIDNSListener, nsITimerCallback)
+
+static
+void PACLogToConsole(nsString &aMessage)
+{
+  nsCOMPtr<nsIConsoleService> consoleService =
+    do_GetService(NS_CONSOLESERVICE_CONTRACTID);
+  if (!consoleService)
+    return;
+
+  consoleService->LogStringMessage(aMessage.get());
+}
+
+// Javascript errors and warnings are logged to the main error console
+static void
+PACLogErrorOrWarning(const nsAString& aKind, JSErrorReport* aReport)
+{
+  nsString formattedMessage(NS_LITERAL_STRING("PAC Execution "));
+  formattedMessage += aKind;
+  formattedMessage += NS_LITERAL_STRING(": ");
+  if (aReport->message())
+    formattedMessage.Append(NS_ConvertUTF8toUTF16(aReport->message().c_str()));
+  formattedMessage += NS_LITERAL_STRING(" [");
+  formattedMessage.Append(aReport->linebuf(), aReport->linebufLength());
+  formattedMessage += NS_LITERAL_STRING("]");
+  PACLogToConsole(formattedMessage);
+}
+
+static void
+PACWarningReporter(JSContext* aCx, JSErrorReport* aReport)
+{
+  MOZ_ASSERT(aReport);
+  MOZ_ASSERT(JSREPORT_IS_WARNING(aReport->flags));
+
+  PACLogErrorOrWarning(NS_LITERAL_STRING("Warning"), aReport);
+}
+
+class MOZ_STACK_CLASS AutoPACErrorReporter
+{
+  JSContext* mCx;
+
+public:
+  explicit AutoPACErrorReporter(JSContext* aCx)
+    : mCx(aCx)
+  {}
+  ~AutoPACErrorReporter() {
+    if (!JS_IsExceptionPending(mCx)) {
+      return;
+    }
+    JS::RootedValue exn(mCx);
+    if (!JS_GetPendingException(mCx, &exn)) {
+      return;
+    }
+    JS_ClearPendingException(mCx);
+
+    js::ErrorReport report(mCx);
+    if (!report.init(mCx, exn, js::ErrorReport::WithSideEffects)) {
+      JS_ClearPendingException(mCx);
+      return;
+    }
+
+    PACLogErrorOrWarning(NS_LITERAL_STRING("Error"), report.report());
+  }
+};
+
+// timeout of 0 means the normal necko timeout strategy, otherwise the dns request
+// will be canceled after aTimeout milliseconds
+static
+bool PACResolve(const nsCString &aHostName, NetAddr *aNetAddr,
+                unsigned int aTimeout)
+{
+  if (!GetRunning()) {
+    NS_WARNING("PACResolve without a running ProxyAutoConfig object");
+    return false;
+  }
+
+  return GetRunning()->ResolveAddress(aHostName, aNetAddr, aTimeout);
+}
+
+ProxyAutoConfig::ProxyAutoConfig()
+  : mJSContext(nullptr)
+  , mJSNeedsSetup(false)
+  , mShutdown(false)
+  , mIncludePath(false)
+{
+  MOZ_COUNT_CTOR(ProxyAutoConfig);
+}
+
+bool
+ProxyAutoConfig::ResolveAddress(const nsCString &aHostName,
+                                NetAddr *aNetAddr,
+                                unsigned int aTimeout)
+{
+  nsCOMPtr<nsIDNSService> dns = do_GetService(NS_DNSSERVICE_CONTRACTID);
+  if (!dns)
+    return false;
+
+  RefPtr<PACResolver> helper = new PACResolver();
+
+  if (NS_FAILED(dns->AsyncResolve(aHostName,
+                                  nsIDNSService::RESOLVE_PRIORITY_MEDIUM,
+                                  helper,
+                                  NS_GetCurrentThread(),
+                                  getter_AddRefs(helper->mRequest))))
+    return false;
+
+  if (aTimeout && helper->mRequest) {
+    if (!mTimer)
+      mTimer = do_CreateInstance(NS_TIMER_CONTRACTID);
+    if (mTimer) {
+      mTimer->InitWithCallback(helper, aTimeout, nsITimer::TYPE_ONE_SHOT);
+      helper->mTimer = mTimer;
+    }
+  }
+
+  // Spin the event loop of the pac thread until lookup is complete.
+  // nsPACman is responsible for keeping a queue and only allowing
+  // one PAC execution at a time even when it is called re-entrantly.
+  while (helper->mRequest)
+    NS_ProcessNextEvent(NS_GetCurrentThread());
+
+  if (NS_FAILED(helper->mStatus) ||
+      NS_FAILED(helper->mResponse->GetNextAddr(0, aNetAddr)))
+    return false;
+  return true;
+}
+
+static
+bool PACResolveToString(const nsCString &aHostName,
+                        nsCString &aDottedDecimal,
+                        unsigned int aTimeout)
+{
+  NetAddr netAddr;
+  if (!PACResolve(aHostName, &netAddr, aTimeout))
+    return false;
+
+  char dottedDecimal[128];
+  if (!NetAddrToString(&netAddr, dottedDecimal, sizeof(dottedDecimal)))
+    return false;
+
+  aDottedDecimal.Assign(dottedDecimal);
+  return true;
+}
+
+// dnsResolve(host) javascript implementation
+static
+bool PACDnsResolve(JSContext *cx, unsigned int argc, JS::Value *vp)
+{
+  JS::CallArgs args = CallArgsFromVp(argc, vp);
+
+  if (NS_IsMainThread()) {
+    NS_WARNING("DNS Resolution From PAC on Main Thread. How did that happen?");
+    return false;
+  }
+
+  if (!args.requireAtLeast(cx, "dnsResolve", 1))
+    return false;
+
+  JS::Rooted<JSString*> arg1(cx, JS::ToString(cx, args[0]));
+  if (!arg1)
+    return false;
+
+  nsAutoJSString hostName;
+  nsAutoCString dottedDecimal;
+
+  if (!hostName.init(cx, arg1))
+    return false;
+  if (PACResolveToString(NS_ConvertUTF16toUTF8(hostName), dottedDecimal, 0)) {
+    JSString *dottedDecimalString = JS_NewStringCopyZ(cx, dottedDecimal.get());
+    if (!dottedDecimalString) {
+      return false;
+    }
+
+    args.rval().setString(dottedDecimalString);
+  }
+  else {
+    args.rval().setNull();
+  }
+
+  return true;
+}
+
+// myIpAddress() javascript implementation
+static
+bool PACMyIpAddress(JSContext *cx, unsigned int argc, JS::Value *vp)
+{
+  JS::CallArgs args = JS::CallArgsFromVp(argc, vp);
+
+  if (NS_IsMainThread()) {
+    NS_WARNING("DNS Resolution From PAC on Main Thread. How did that happen?");
+    return false;
+  }
+
+  if (!GetRunning()) {
+    NS_WARNING("PAC myIPAddress without a running ProxyAutoConfig object");
+    return false;
+  }
+
+  return GetRunning()->MyIPAddress(args);
+}
+
+// proxyAlert(msg) javascript implementation
+static
+bool PACProxyAlert(JSContext *cx, unsigned int argc, JS::Value *vp)
+{
+  JS::CallArgs args = CallArgsFromVp(argc, vp);
+
+  if (!args.requireAtLeast(cx, "alert", 1))
+    return false;
+
+  JS::Rooted<JSString*> arg1(cx, JS::ToString(cx, args[0]));
+  if (!arg1)
+    return false;
+
+  nsAutoJSString message;
+  if (!message.init(cx, arg1))
+    return false;
+
+  nsAutoString alertMessage;
+  alertMessage.SetCapacity(32 + message.Length());
+  alertMessage += NS_LITERAL_STRING("PAC-alert: ");
+  alertMessage += message;
+  PACLogToConsole(alertMessage);
+
+  args.rval().setUndefined();  /* return undefined */
+  return true;
+}
+
+static const JSFunctionSpec PACGlobalFunctions[] = {
+  JS_FS("dnsResolve", PACDnsResolve, 1, 0),
+
+  // a global "var pacUseMultihomedDNS = true;" will change behavior
+  // of myIpAddress to actively use DNS
+  JS_FS("myIpAddress", PACMyIpAddress, 0, 0),
+  JS_FS("alert", PACProxyAlert, 1, 0),
+  JS_FS_END
+};
+
+// JSContextWrapper is a c++ object that manages the context for the JS engine
+// used on the PAC thread. It is initialized and destroyed on the PAC thread.
+class JSContextWrapper
+{
+ public:
+  static JSContextWrapper *Create()
+  {
+    JSContext* cx = JS_NewContext(sContextHeapSize);
+    if (NS_WARN_IF(!cx))
+      return nullptr;
+
+    JSContextWrapper *entry = new JSContextWrapper(cx);
+    if (NS_FAILED(entry->Init())) {
+      delete entry;
+      return nullptr;
+    }
+
+    return entry;
+  }
+
+  JSContext *Context() const
+  {
+    return mContext;
+  }
+
+  JSObject *Global() const
+  {
+    return mGlobal;
+  }
+
+  ~JSContextWrapper()
+  {
+    mGlobal = nullptr;
+
+    MOZ_COUNT_DTOR(JSContextWrapper);
+
+    if (mContext) {
+      JS_DestroyContext(mContext);
+    }
+  }
+
+  void SetOK()
+  {
+    mOK = true;
+  }
+
+  bool IsOK()
+  {
+    return mOK;
+  }
+
+private:
+  static const unsigned sContextHeapSize = 4 << 20; // 4 MB
+
+  JSContext *mContext;
+  JS::PersistentRooted<JSObject*> mGlobal;
+  bool      mOK;
+
+  static const JSClass sGlobalClass;
+
+  explicit JSContextWrapper(JSContext* cx)
+    : mContext(cx), mGlobal(cx, nullptr), mOK(false)
+  {
+      MOZ_COUNT_CTOR(JSContextWrapper);
+  }
+
+  nsresult Init()
+  {
+    /*
+     * Not setting this will cause JS_CHECK_RECURSION to report false
+     * positives
+     */
+    JS_SetNativeStackQuota(mContext, 128 * sizeof(size_t) * 1024);
+
+    JS::SetWarningReporter(mContext, PACWarningReporter);
+
+    if (!JS::InitSelfHostedCode(mContext)) {
+      return NS_ERROR_OUT_OF_MEMORY;
+    }
+
+    JSAutoRequest ar(mContext);
+
+    JS::CompartmentOptions options;
+    options.creationOptions().setZone(JS::SystemZone);
+    options.behaviors().setVersion(JSVERSION_LATEST);
+    mGlobal = JS_NewGlobalObject(mContext, &sGlobalClass, nullptr,
+                                 JS::DontFireOnNewGlobalHook, options);
+    if (!mGlobal) {
+      JS_ClearPendingException(mContext);
+      return NS_ERROR_OUT_OF_MEMORY;
+    }
+    JS::Rooted<JSObject*> global(mContext, mGlobal);
+
+    JSAutoCompartment ac(mContext, global);
+    AutoPACErrorReporter aper(mContext);
+    if (!JS_InitStandardClasses(mContext, global)) {
+      return NS_ERROR_FAILURE;
+    }
+    if (!JS_DefineFunctions(mContext, global, PACGlobalFunctions)) {
+      return NS_ERROR_FAILURE;
+    }
+
+    JS_FireOnNewGlobalObject(mContext, global);
+
+    return NS_OK;
+  }
+};
+
+static const JSClassOps sJSContextWrapperGlobalClassOps = {
+  nullptr, nullptr, nullptr, nullptr,
+  nullptr, nullptr, nullptr, nullptr,
+  nullptr, nullptr, nullptr,
+  JS_GlobalObjectTraceHook
+};
+
+const JSClass JSContextWrapper::sGlobalClass = {
+  "PACResolutionThreadGlobal",
+  JSCLASS_GLOBAL_FLAGS,
+  &sJSContextWrapperGlobalClassOps
+};
+
+void
+ProxyAutoConfig::SetThreadLocalIndex(uint32_t index)
+{
+  sRunningIndex = index;
+}
+
+nsresult
+ProxyAutoConfig::Init(const nsCString &aPACURI,
+                      const nsCString &aPACScript,
+                      bool aIncludePath)
+{
+  mPACURI = aPACURI;
+  mPACScript = sPacUtils;
+  mPACScript.Append(aPACScript);
+  mIncludePath = aIncludePath;
+
+  if (!GetRunning())
+    return SetupJS();
+
+  mJSNeedsSetup = true;
+  return NS_OK;
+}
+
+nsresult
+ProxyAutoConfig::SetupJS()
+{
+  mJSNeedsSetup = false;
+  MOZ_ASSERT(!GetRunning(), "JIT is running");
+
+  delete mJSContext;
+  mJSContext = nullptr;
+
+  if (mPACScript.IsEmpty())
+    return NS_ERROR_FAILURE;
+
+  NS_GetCurrentThread()->SetCanInvokeJS(true);
+
+  mJSContext = JSContextWrapper::Create();
+  if (!mJSContext)
+    return NS_ERROR_FAILURE;
+
+  JSContext* cx = mJSContext->Context();
+  JSAutoRequest ar(cx);
+  JSAutoCompartment ac(cx, mJSContext->Global());
+  AutoPACErrorReporter aper(cx);
+
+  // check if this is a data: uri so that we don't spam the js console with
+  // huge meaningless strings. this is not on the main thread, so it can't
+  // use nsIURI scheme methods
+  bool isDataURI = nsDependentCSubstring(mPACURI, 0, 5).LowerCaseEqualsASCII("data:", 5);
+
+  SetRunning(this);
+  JS::Rooted<JSObject*> global(cx, mJSContext->Global());
+  JS::CompileOptions options(cx);
+  options.setFileAndLine(mPACURI.get(), 1);
+  JS::Rooted<JSScript*> script(cx);
+  if (!JS_CompileScript(cx, mPACScript.get(), mPACScript.Length(), options,
+                        &script) ||
+      !JS_ExecuteScript(cx, script))
+  {
+    nsString alertMessage(NS_LITERAL_STRING("PAC file failed to install from "));
+    if (isDataURI) {
+      alertMessage += NS_LITERAL_STRING("data: URI");
+    }
+    else {
+      alertMessage += NS_ConvertUTF8toUTF16(mPACURI);
+    }
+    PACLogToConsole(alertMessage);
+    SetRunning(nullptr);
+    return NS_ERROR_FAILURE;
+  }
+  SetRunning(nullptr);
+
+  mJSContext->SetOK();
+  nsString alertMessage(NS_LITERAL_STRING("PAC file installed from "));
+  if (isDataURI) {
+    alertMessage += NS_LITERAL_STRING("data: URI");
+  }
+  else {
+    alertMessage += NS_ConvertUTF8toUTF16(mPACURI);
+  }
+  PACLogToConsole(alertMessage);
+
+  // we don't need these now
+  mPACScript.Truncate();
+  mPACURI.Truncate();
+
+  return NS_OK;
+}
+
+nsresult
+ProxyAutoConfig::GetProxyForURI(const nsCString &aTestURI,
+                                const nsCString &aTestHost,
+                                nsACString &result)
+{
+  if (mJSNeedsSetup)
+    SetupJS();
+
+  if (!mJSContext || !mJSContext->IsOK())
+    return NS_ERROR_NOT_AVAILABLE;
+
+  JSContext *cx = mJSContext->Context();
+  JSAutoRequest ar(cx);
+  JSAutoCompartment ac(cx, mJSContext->Global());
+  AutoPACErrorReporter aper(cx);
+
+  // the sRunning flag keeps a new PAC file from being installed
+  // while the event loop is spinning on a DNS function. Don't early return.
+  SetRunning(this);
+  mRunningHost = aTestHost;
+
+  nsresult rv = NS_ERROR_FAILURE;
+  nsCString clensedURI = aTestURI;
+
+  if (!mIncludePath) {
+    nsCOMPtr<nsIURLParser> urlParser =
+      do_GetService(NS_STDURLPARSER_CONTRACTID);
+    int32_t pathLen = 0;
+    if (urlParser) {
+      uint32_t schemePos;
+      int32_t schemeLen;
+      uint32_t authorityPos;
+      int32_t authorityLen;
+      uint32_t pathPos;
+      rv = urlParser->ParseURL(aTestURI.get(), aTestURI.Length(),
+                               &schemePos, &schemeLen,
+                               &authorityPos, &authorityLen,
+                               &pathPos, &pathLen);
+    }
+    if (NS_SUCCEEDED(rv)) {
+      if (pathLen) {
+        // cut off the path but leave the initial slash
+        pathLen--;
+      }
+      aTestURI.Left(clensedURI, aTestURI.Length() - pathLen);
+    }
+  }
+
+  JS::RootedString uriString(cx, JS_NewStringCopyZ(cx, clensedURI.get()));
+  JS::RootedString hostString(cx, JS_NewStringCopyZ(cx, aTestHost.get()));
+
+  if (uriString && hostString) {
+    JS::AutoValueArray<2> args(cx);
+    args[0].setString(uriString);
+    args[1].setString(hostString);
+
+    JS::Rooted<JS::Value> rval(cx);
+    JS::Rooted<JSObject*> global(cx, mJSContext->Global());
+    bool ok = JS_CallFunctionName(cx, global, "FindProxyForURL", args, &rval);
+
+    if (ok && rval.isString()) {
+      nsAutoJSString pacString;
+      if (pacString.init(cx, rval.toString())) {
+        CopyUTF16toUTF8(pacString, result);
+        rv = NS_OK;
+      }
+    }
+  }
+
+  mRunningHost.Truncate();
+  SetRunning(nullptr);
+  return rv;
+}
+
+void
+ProxyAutoConfig::GC()
+{
+  if (!mJSContext || !mJSContext->IsOK())
+    return;
+
+  JSAutoCompartment ac(mJSContext->Context(), mJSContext->Global());
+  JS_MaybeGC(mJSContext->Context());
+}
+
+ProxyAutoConfig::~ProxyAutoConfig()
+{
+  MOZ_COUNT_DTOR(ProxyAutoConfig);
+  NS_ASSERTION(!mJSContext,
+               "~ProxyAutoConfig leaking JS context that "
+               "should have been deleted on pac thread");
+}
+
+void
+ProxyAutoConfig::Shutdown()
+{
+  MOZ_ASSERT(!NS_IsMainThread(), "wrong thread for shutdown");
+
+  if (GetRunning() || mShutdown)
+    return;
+
+  mShutdown = true;
+  delete mJSContext;
+  mJSContext = nullptr;
+}
+
+bool
+ProxyAutoConfig::SrcAddress(const NetAddr *remoteAddress, nsCString &localAddress)
+{
+  PRFileDesc *fd;
+  fd = PR_OpenUDPSocket(remoteAddress->raw.family);
+  if (!fd)
+    return false;
+
+  PRNetAddr prRemoteAddress;
+  NetAddrToPRNetAddr(remoteAddress, &prRemoteAddress);
+  if (PR_Connect(fd, &prRemoteAddress, 0) != PR_SUCCESS) {
+    PR_Close(fd);
+    return false;
+  }
+
+  PRNetAddr localName;
+  if (PR_GetSockName(fd, &localName) != PR_SUCCESS) {
+    PR_Close(fd);
+    return false;
+  }
+
+  PR_Close(fd);
+
+  char dottedDecimal[128];
+  if (PR_NetAddrToString(&localName, dottedDecimal, sizeof(dottedDecimal)) != PR_SUCCESS)
+    return false;
+
+  localAddress.Assign(dottedDecimal);
+
+  return true;
+}
+
+// hostName is run through a dns lookup and then a udp socket is connected
+// to the result. If that all works, the local IP address of the socket is
+// returned to the javascript caller and |*aResult| is set to true. Otherwise
+// |*aResult| is set to false.
+bool
+ProxyAutoConfig::MyIPAddressTryHost(const nsCString &hostName,
+                                    unsigned int timeout,
+                                    const JS::CallArgs &aArgs,
+                                    bool* aResult)
+{
+  *aResult = false;
+
+  NetAddr remoteAddress;
+  nsAutoCString localDottedDecimal;
+  JSContext *cx = mJSContext->Context();
+
+  if (PACResolve(hostName, &remoteAddress, timeout) &&
+      SrcAddress(&remoteAddress, localDottedDecimal)) {
+    JSString *dottedDecimalString =
+      JS_NewStringCopyZ(cx, localDottedDecimal.get());
+    if (!dottedDecimalString) {
+      return false;
+    }
+
+    *aResult = true;
+    aArgs.rval().setString(dottedDecimalString);
+  }
+  return true;
+}
+
+bool
+ProxyAutoConfig::MyIPAddress(const JS::CallArgs &aArgs)
+{
+  nsAutoCString remoteDottedDecimal;
+  nsAutoCString localDottedDecimal;
+  JSContext *cx = mJSContext->Context();
+  JS::RootedValue v(cx);
+  JS::Rooted<JSObject*> global(cx, mJSContext->Global());
+
+  bool useMultihomedDNS =
+    JS_GetProperty(cx,  global, "pacUseMultihomedDNS", &v) &&
+    !v.isUndefined() && ToBoolean(v);
+
+  // first, lookup the local address of a socket connected
+  // to the host of uri being resolved by the pac file. This is
+  // v6 safe.. but is the last step like that
+  bool rvalAssigned = false;
+  if (useMultihomedDNS) {
+    if (!MyIPAddressTryHost(mRunningHost, kTimeout, aArgs, &rvalAssigned) ||
+        rvalAssigned) {
+      return rvalAssigned;
+    }
+  } else {
+    // we can still do the fancy multi homing thing if the host is a literal
+    PRNetAddr tempAddr;
+    memset(&tempAddr, 0, sizeof(PRNetAddr));
+    if ((PR_StringToNetAddr(mRunningHost.get(), &tempAddr) == PR_SUCCESS) &&
+        (!MyIPAddressTryHost(mRunningHost, kTimeout, aArgs, &rvalAssigned) ||
+         rvalAssigned)) {
+      return rvalAssigned;
+    }
+  }
+
+  // next, look for a route to a public internet address that doesn't need DNS.
+  // This is the google anycast dns address, but it doesn't matter if it
+  // remains operable (as we don't contact it) as long as the address stays
+  // in commonly routed IP address space.
+  remoteDottedDecimal.AssignLiteral("8.8.8.8");
+  if (!MyIPAddressTryHost(remoteDottedDecimal, 0, aArgs, &rvalAssigned) ||
+      rvalAssigned) {
+    return rvalAssigned;
+  }
+
+  // finally, use the old algorithm based on the local hostname
+  nsAutoCString hostName;
+  nsCOMPtr<nsIDNSService> dns = do_GetService(NS_DNSSERVICE_CONTRACTID);
+  // without multihomedDNS use such a short timeout that we are basically
+  // just looking at the cache for raw dotted decimals
+  uint32_t timeout = useMultihomedDNS ? kTimeout : 1;
+  if (dns && NS_SUCCEEDED(dns->GetMyHostName(hostName)) &&
+      PACResolveToString(hostName, localDottedDecimal, timeout)) {
+    JSString *dottedDecimalString =
+      JS_NewStringCopyZ(cx, localDottedDecimal.get());
+    if (!dottedDecimalString) {
+      return false;
+    }
+
+    aArgs.rval().setString(dottedDecimalString);
+    return true;
+  }
+
+  // next try a couple RFC 1918 variants.. maybe there is a
+  // local route
+  remoteDottedDecimal.AssignLiteral("192.168.0.1");
+  if (!MyIPAddressTryHost(remoteDottedDecimal, 0, aArgs, &rvalAssigned) ||
+      rvalAssigned) {
+    return rvalAssigned;
+  }
+
+  // more RFC 1918
+  remoteDottedDecimal.AssignLiteral("10.0.0.1");
+  if (!MyIPAddressTryHost(remoteDottedDecimal, 0, aArgs, &rvalAssigned) ||
+      rvalAssigned) {
+    return rvalAssigned;
+  }
+
+  // who knows? let's fallback to localhost
+  localDottedDecimal.AssignLiteral("127.0.0.1");
+  JSString *dottedDecimalString =
+    JS_NewStringCopyZ(cx, localDottedDecimal.get());
+  if (!dottedDecimalString) {
+    return false;
+  }
+
+  aArgs.rval().setString(dottedDecimalString);
+  return true;
+}
+
+} // namespace net
+} // namespace mozilla