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/* -*- 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 "nsINamed.h"
#include "nsThreadUtils.h"
#include "nsIConsoleService.h"
#include "nsIURLParser.h"
#include "nsJSUtils.h"
#include "jsfriendapi.h"
#include "js/CompilationAndEvaluation.h" // JS::Compile
#include "js/ContextOptions.h"
#include "js/PropertySpec.h"
#include "js/SourceText.h" // JS::Source{Ownership,Text}
#include "js/Utility.h"
#include "js/Warnings.h" // JS::SetWarningReporter
#include "prnetdb.h"
#include "nsITimer.h"
#include "mozilla/Atomics.h"
#include "mozilla/net/DNS.h"
#include "mozilla/Utf8.h" // mozilla::Utf8Unit
#include "nsServiceManagerUtils.h"
#include "nsNetCID.h"
#if defined(XP_MACOSX)
# include "nsMacUtilsImpl.h"
#endif
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.
//
// Per ProxyAutoConfig::Init, this data must be ASCII.
static const char sAsciiPacUtils[] =
"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 isValidIpAddress(ipchars) {\n"
" var matches = "
"/^(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})$/.exec(ipchars);\n"
" if (matches == null) {\n"
" return false;\n"
" } else if (matches[1] > 255 || matches[2] > 255 || \n"
" matches[3] > 255 || matches[4] > 255) {\n"
" return false;\n"
" }\n"
" return true;\n"
"}\n"
""
"function convert_addr(ipchars) {\n"
" var bytes = ipchars.split('.');\n"
" var result = ((bytes[0] & 0xff) << 24) |\n"
" ((bytes[1] & 0xff) << 16) |\n"
" ((bytes[2] & 0xff) << 8) |\n"
" (bytes[3] & 0xff);\n"
" return result;\n"
"}\n"
""
"function isInNet(ipaddr, pattern, maskstr) {\n"
" if (!isValidIpAddress(pattern) || !isValidIpAddress(maskstr)) {\n"
" return false;\n"
" }\n"
" if (!isValidIpAddress(ipaddr)) {\n"
" ipaddr = dnsResolve(ipaddr);\n"
" if (ipaddr == null) {\n"
" return false;\n"
" }\n"
" }\n"
" var host = convert_addr(ipaddr);\n"
" var pat = convert_addr(pattern);\n"
" var mask = convert_addr(maskstr);\n"
" return ((host & mask) == (pat & mask));\n"
" \n"
"}\n"
""
"function isPlainHostName(host) {\n"
" return (host.search('\\\\.') == -1);\n"
"}\n"
""
"function isResolvable(host) {\n"
" var ip = dnsResolve(host);\n"
" return (ip != null);\n"
"}\n"
""
"function localHostOrDomainIs(host, hostdom) {\n"
" return (host == hostdom) ||\n"
" (hostdom.lastIndexOf(host + '.', 0) == 0);\n"
"}\n"
""
"function shExpMatch(url, pattern) {\n"
" pattern = pattern.replace(/\\./g, '\\\\.');\n"
" pattern = pattern.replace(/\\*/g, '.*');\n"
" pattern = pattern.replace(/\\?/g, '.');\n"
" var newRe = new RegExp('^'+pattern+'$');\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 Atomic<uint32_t, Relaxed>& RunningIndex() {
static Atomic<uint32_t, Relaxed> sRunningIndex(0xdeadbeef);
return sRunningIndex;
}
static ProxyAutoConfig* GetRunning() {
MOZ_ASSERT(RunningIndex() != 0xdeadbeef);
return static_cast<ProxyAutoConfig*>(PR_GetThreadPrivate(RunningIndex()));
}
static void SetRunning(ProxyAutoConfig* arg) {
MOZ_ASSERT(RunningIndex() != 0xdeadbeef);
PR_SetThreadPrivate(RunningIndex(), arg);
}
// The PACResolver is used for dnsResolve()
class PACResolver final : public nsIDNSListener,
public nsITimerCallback,
public nsINamed {
public:
NS_DECL_THREADSAFE_ISUPPORTS
explicit PACResolver(nsIEventTarget* aTarget)
: mStatus(NS_ERROR_FAILURE),
mMainThreadEventTarget(aTarget),
mMutex("PACResolver::Mutex") {}
// nsIDNSListener
NS_IMETHOD OnLookupComplete(nsICancelable* request, nsIDNSRecord* record,
nsresult status) override {
nsCOMPtr<nsITimer> timer;
{
MutexAutoLock lock(mMutex);
timer.swap(mTimer);
mRequest = nullptr;
}
if (timer) {
timer->Cancel();
}
mStatus = status;
mResponse = record;
return NS_OK;
}
// nsITimerCallback
NS_IMETHOD Notify(nsITimer* timer) override {
nsCOMPtr<nsICancelable> request;
{
MutexAutoLock lock(mMutex);
request.swap(mRequest);
mTimer = nullptr;
}
if (request) {
request->Cancel(NS_ERROR_NET_TIMEOUT);
}
return NS_OK;
}
// nsINamed
NS_IMETHOD GetName(nsACString& aName) override {
aName.AssignLiteral("PACResolver");
return NS_OK;
}
nsresult mStatus;
nsCOMPtr<nsICancelable> mRequest;
nsCOMPtr<nsIDNSRecord> mResponse;
nsCOMPtr<nsITimer> mTimer;
nsCOMPtr<nsIEventTarget> mMainThreadEventTarget;
Mutex mMutex;
private:
~PACResolver() = default;
};
NS_IMPL_ISUPPORTS(PACResolver, nsIDNSListener, nsITimerCallback, nsINamed)
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(aReport->isWarning());
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::ExceptionStack exnStack(mCx);
if (!JS::StealPendingExceptionStack(mCx, &exnStack)) {
return;
}
JS::ErrorReportBuilder report(mCx);
if (!report.init(mCx, exnStack, JS::ErrorReportBuilder::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(true),
mIncludePath(false),
mExtraHeapSize(0) {
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(mMainThreadEventTarget);
OriginAttributes attrs;
if (NS_FAILED(dns->AsyncResolveNative(
aHostName, nsIDNSService::RESOLVE_PRIORITY_MEDIUM, helper,
GetCurrentThreadEventTarget(), attrs,
getter_AddRefs(helper->mRequest))))
return false;
if (aTimeout && helper->mRequest) {
if (!mTimer) mTimer = NS_NewTimer();
if (mTimer) {
mTimer->SetTarget(mMainThreadEventTarget);
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.
SpinEventLoopUntil([&, helper, this]() {
if (!helper->mRequest) {
return true;
}
if (this->mShutdown) {
NS_WARNING("mShutdown set with PAC request not cancelled");
MOZ_ASSERT(NS_FAILED(helper->mStatus));
return true;
}
return false;
});
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.AssignLiteral(u"PAC-alert: ");
alertMessage.Append(message);
PACLogToConsole(alertMessage);
args.rval().setUndefined(); /* return undefined */
return true;
}
static const JSFunctionSpec PACGlobalFunctions[] = {
JS_FN("dnsResolve", PACDnsResolve, 1, 0),
// a global "var pacUseMultihomedDNS = true;" will change behavior
// of myIpAddress to actively use DNS
JS_FN("myIpAddress", PACMyIpAddress, 0, 0),
JS_FN("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(uint32_t aExtraHeapSize) {
JSContext* cx = JS_NewContext(JS::DefaultHeapMaxBytes + aExtraHeapSize);
if (NS_WARN_IF(!cx)) return nullptr;
JS::ContextOptionsRef(cx).setDisableIon().setDisableEvalSecurityChecks();
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:
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;
}
JS::RealmOptions options;
options.creationOptions().setNewCompartmentInSystemZone();
options.behaviors().setClampAndJitterTime(false);
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);
JSAutoRealm ar(mContext, global);
AutoPACErrorReporter aper(mContext);
if (!JS_DefineFunctions(mContext, global, PACGlobalFunctions)) {
return NS_ERROR_FAILURE;
}
JS_FireOnNewGlobalObject(mContext, global);
return NS_OK;
}
};
const JSClass JSContextWrapper::sGlobalClass = {"PACResolutionThreadGlobal",
JSCLASS_GLOBAL_FLAGS,
&JS::DefaultGlobalClassOps};
void ProxyAutoConfig::SetThreadLocalIndex(uint32_t index) {
RunningIndex() = index;
}
nsresult ProxyAutoConfig::Init(const nsCString& aPACURI,
const nsCString& aPACScriptData,
bool aIncludePath, uint32_t aExtraHeapSize,
nsIEventTarget* aEventTarget) {
mShutdown = false; // Shutdown needs to be called prior to destruction
mPACURI = aPACURI;
// The full PAC script data is the concatenation of 1) the various functions
// exposed to PAC scripts in |sAsciiPacUtils| and 2) the user-provided PAC
// script data. Historically this was single-byte Latin-1 text (usually just
// ASCII, but bug 296163 has a real-world Latin-1 example). We now support
// UTF-8 if the full data validates as UTF-8, before falling back to Latin-1.
// (Technically this is a breaking change: intentional Latin-1 scripts that
// happen to be valid UTF-8 may have different behavior. We assume such cases
// are vanishingly rare.)
//
// Supporting both UTF-8 and Latin-1 requires that the functions exposed to
// PAC scripts be both UTF-8- and Latin-1-compatible: that is, they must be
// ASCII.
mConcatenatedPACData = sAsciiPacUtils;
mConcatenatedPACData.Append(aPACScriptData);
mIncludePath = aIncludePath;
mExtraHeapSize = aExtraHeapSize;
mMainThreadEventTarget = aEventTarget;
if (!GetRunning()) return SetupJS();
mJSNeedsSetup = true;
return NS_OK;
}
nsresult ProxyAutoConfig::SetupJS() {
mJSNeedsSetup = false;
MOZ_ASSERT(!GetRunning(), "JIT is running");
#if defined(XP_MACOSX)
nsMacUtilsImpl::EnableTCSMIfAvailable();
#endif
delete mJSContext;
mJSContext = nullptr;
if (mConcatenatedPACData.IsEmpty()) return NS_ERROR_FAILURE;
NS_GetCurrentThread()->SetCanInvokeJS(true);
mJSContext = JSContextWrapper::Create(mExtraHeapSize);
if (!mJSContext) return NS_ERROR_FAILURE;
JSContext* cx = mJSContext->Context();
JSAutoRealm ar(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());
auto CompilePACScript = [this](JSContext* cx) -> JSScript* {
JS::CompileOptions options(cx);
options.setSkipFilenameValidation(true);
options.setFileAndLine(this->mPACURI.get(), 1);
// Per ProxyAutoConfig::Init, compile as UTF-8 if the full data is UTF-8,
// and otherwise inflate Latin-1 to UTF-16 and compile that.
const char* scriptData = this->mConcatenatedPACData.get();
size_t scriptLength = this->mConcatenatedPACData.Length();
if (mozilla::IsUtf8(mozilla::MakeSpan(scriptData, scriptLength))) {
JS::SourceText<Utf8Unit> srcBuf;
if (!srcBuf.init(cx, scriptData, scriptLength,
JS::SourceOwnership::Borrowed)) {
return nullptr;
}
return JS::Compile(cx, options, srcBuf);
}
// nsReadableUtils.h says that "ASCII" is a misnomer "for legacy reasons",
// and this handles not just ASCII but Latin-1 too.
NS_ConvertASCIItoUTF16 inflated(this->mConcatenatedPACData);
JS::SourceText<char16_t> source;
if (!source.init(cx, inflated.get(), inflated.Length(),
JS::SourceOwnership::Borrowed)) {
return nullptr;
}
return JS::Compile(cx, options, source);
};
JS::Rooted<JSScript*> script(cx, CompilePACScript(cx));
if (!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
mConcatenatedPACData.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();
JSAutoRealm ar(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::RootedValueArray<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;
JSAutoRealm ar(mJSContext->Context(), mJSContext->Global());
JS_MaybeGC(mJSContext->Context());
}
ProxyAutoConfig::~ProxyAutoConfig() {
MOZ_COUNT_DTOR(ProxyAutoConfig);
MOZ_ASSERT(mShutdown, "Shutdown must be called before dtor.");
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 (NS_WARN_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