nagai/fune
3
0
Fork 0
forked from mirrors/gecko-dev
Code Pull requests Activity
fune/netwerk/base/ProxyAutoConfig.cpp
Nika Layzell 852d02ec16 Bug 1809753 - Part 3: Replace all callers of GetCurrentEventTarget with GetCurrentSerialEventTarget, r=mccr8,necko-reviewers,valentin 
This only changes the behaviour when called with a TaskQueue or other type
using SerialEventTargetGuard on the stack. They are being switched over as the
existing GetCurrentEventTarget method is being removed, as it is somewhat
confusing, and poorly documented.

Callers which need to get the current thread even when on a threadpool or
behind a TaskQueue were switched to GetCurrentEventTarget in the previous part.

Differential Revision: https://phabricator.services.mozilla.com/D166607
2023-01-16 23:14:11 +00:00

942 lines
29 KiB
C++
Raw Blame History

/* -*- 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/CallAndConstruct.h" // JS_CallFunctionName
#include "js/CompilationAndEvaluation.h" // JS::Compile
#include "js/ContextOptions.h"
#include "js/Initialization.h"
#include "js/PropertyAndElement.h" // JS_DefineFunctions, JS_GetProperty
#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/SpinEventLoopUntil.h"
#include "mozilla/ipc/Endpoint.h"
#include "mozilla/net/DNS.h"
#include "mozilla/net/SocketProcessChild.h"
#include "mozilla/net/SocketProcessParent.h"
#include "mozilla/net/ProxyAutoConfigChild.h"
#include "mozilla/net/ProxyAutoConfigParent.h"
#include "mozilla/Utf8.h" // mozilla::Utf8Unit
#include "nsServiceManagerUtils.h"
#include "nsNetCID.h"
#if defined(XP_MACOSX)
# include "nsMacUtilsImpl.h"
#endif
#include "XPCSelfHostedShmem.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.
//
// Per ProxyAutoConfig::Init, this data must be ASCII.
static const char sAsciiPacUtils[] =
#include "ascii_pac_utils.inc"
;
// 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);
MOZ_DIAGNOSTIC_ASSERT_IF(!arg, GetRunning() != nullptr);
MOZ_DIAGNOSTIC_ASSERT_IF(arg, GetRunning() == nullptr);
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 MOZ_UNANNOTATED;
private:
~PACResolver() = default;
};
NS_IMPL_ISUPPORTS(PACResolver, nsIDNSListener, nsITimerCallback, nsINamed)
static void PACLogToConsole(nsString& aMessage) {
if (XRE_IsSocketProcess()) {
auto task = [message(aMessage)]() {
SocketProcessChild* child = SocketProcessChild::GetSingleton();
if (child) {
Unused << child->SendOnConsoleMessage(message);
}
};
if (NS_IsMainThread()) {
task();
} else {
NS_DispatchToMainThread(NS_NewRunnableFunction("PACLogToConsole", task));
}
return;
}
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(u"PAC Execution "_ns);
formattedMessage += aKind;
formattedMessage += u": "_ns;
if (aReport->message()) {
formattedMessage.Append(NS_ConvertUTF8toUTF16(aReport->message().c_str()));
}
formattedMessage += u" ["_ns;
formattedMessage.Append(aReport->linebuf(), aReport->linebufLength());
formattedMessage += u"]"_ns;
PACLogToConsole(formattedMessage);
}
static void PACWarningReporter(JSContext* aCx, JSErrorReport* aReport) {
MOZ_ASSERT(aReport);
MOZ_ASSERT(aReport->isWarning());
PACLogErrorOrWarning(u"Warning"_ns, 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(u"Error"_ns, 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 nsACString& 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()
{
MOZ_COUNT_CTOR(ProxyAutoConfig);
}
bool ProxyAutoConfig::ResolveAddress(const nsACString& 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;
// When the PAC script attempts to resolve a domain, we must make sure we
// don't use TRR, otherwise the TRR channel might also attempt to resolve
// a name and we'll have a deadlock.
nsIDNSService::DNSFlags flags =
nsIDNSService::RESOLVE_PRIORITY_MEDIUM |
nsIDNSService::GetFlagsFromTRRMode(nsIRequest::TRR_DISABLED_MODE);
if (NS_FAILED(dns->AsyncResolveNative(
aHostName, nsIDNSService::RESOLVE_TYPE_DEFAULT, flags, nullptr,
helper, GetCurrentSerialEventTarget(), 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("ProxyAutoConfig::ResolveAddress"_ns, [&, 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)) {
return false;
}
nsCOMPtr<nsIDNSAddrRecord> rec = do_QueryInterface(helper->mResponse);
return !(!rec || NS_FAILED(rec->GetNextAddr(0, aNetAddr)));
}
static bool PACResolveToString(const nsACString& aHostName,
nsCString& aDottedDecimal,
unsigned int aTimeout) {
NetAddr netAddr;
if (!PACResolve(aHostName, &netAddr, aTimeout)) return false;
char dottedDecimal[128];
if (!netAddr.ToStringBuffer(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;
// Previously we didn't check the type of the argument, so just converted it
// to string. A badly written PAC file oculd pass null or undefined here
// which could lead to odd results if there are any hosts called "null"
// on the network. See bug 1724345 comment 6.
if (!args[0].isString()) {
args.rval().setNull();
return true;
}
JS::Rooted<JSString*> arg1(cx);
arg1 = args[0].toString();
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);
// When available, set the self-hosted shared memory to be read, so that
// we can decode the self-hosted content instead of parsing it.
{
auto& shm = xpc::SelfHostedShmem::GetSingleton();
JS::SelfHostedCache selfHostedContent = shm.Content();
if (!JS::InitSelfHostedCode(mContext, selfHostedContent)) {
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::ConfigurePAC(const nsACString& aPACURI,
const nsACString& 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;
if (!mConcatenatedPACData.Append(aPACScriptData, mozilla::fallible)) {
return NS_ERROR_OUT_OF_MEMORY;
}
mIncludePath = aIncludePath;
mExtraHeapSize = aExtraHeapSize;
mMainThreadEventTarget = aEventTarget;
if (!GetRunning()) return SetupJS();
mJSNeedsSetup = true;
return NS_OK;
}
nsresult ProxyAutoConfig::SetupJS() {
mJSNeedsSetup = false;
MOZ_DIAGNOSTIC_ASSERT(!GetRunning(), "JIT is running");
if (GetRunning()) {
return NS_ERROR_ALREADY_INITIALIZED;
}
#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::Span(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(u"PAC file failed to install from "_ns);
if (isDataURI) {
alertMessage += u"data: URI"_ns;
} else {
alertMessage += NS_ConvertUTF8toUTF16(mPACURI);
}
PACLogToConsole(alertMessage);
SetRunning(nullptr);
return NS_ERROR_FAILURE;
}
SetRunning(nullptr);
mJSContext->SetOK();
nsString alertMessage(u"PAC file installed from "_ns);
if (isDataURI) {
alertMessage += u"data: URI"_ns;
} else {
alertMessage += NS_ConvertUTF8toUTF16(mPACURI);
}
PACLogToConsole(alertMessage);
// we don't need these now
mConcatenatedPACData.Truncate();
mPACURI.Truncate();
return NS_OK;
}
void ProxyAutoConfig::GetProxyForURIWithCallback(
const nsACString& aTestURI, const nsACString& aTestHost,
std::function<void(nsresult aStatus, const nsACString& aResult)>&&
aCallback) {
nsAutoCString result;
nsresult status = GetProxyForURI(aTestURI, aTestHost, result);
aCallback(status, result);
}
nsresult ProxyAutoConfig::GetProxyForURI(const nsACString& aTestURI,
const nsACString& 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.BeginReading(), 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::Rooted<JSString*> uriString(
cx,
JS_NewStringCopyN(cx, clensedURI.BeginReading(), clensedURI.Length()));
JS::Rooted<JSString*> hostString(
cx, JS_NewStringCopyN(cx, aTestHost.BeginReading(), aTestHost.Length()));
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 nsACString& 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::Rooted<JS::Value> 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
if (HostIsIPLiteral(mRunningHost) &&
(!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;
}
RemoteProxyAutoConfig::RemoteProxyAutoConfig() = default;
RemoteProxyAutoConfig::~RemoteProxyAutoConfig() = default;
nsresult RemoteProxyAutoConfig::Init(nsIThread* aPACThread) {
MOZ_ASSERT(NS_IsMainThread());
SocketProcessParent* socketProcessParent =
SocketProcessParent::GetSingleton();
if (!socketProcessParent) {
return NS_ERROR_NOT_AVAILABLE;
}
ipc::Endpoint<PProxyAutoConfigParent> parent;
ipc::Endpoint<PProxyAutoConfigChild> child;
nsresult rv = PProxyAutoConfig::CreateEndpoints(
base::GetCurrentProcId(), socketProcessParent->OtherPid(), &parent,
&child);
if (NS_FAILED(rv)) {
return rv;
}
Unused << socketProcessParent->SendInitProxyAutoConfigChild(std::move(child));
mProxyAutoConfigParent = new ProxyAutoConfigParent();
return aPACThread->Dispatch(
NS_NewRunnableFunction("ProxyAutoConfigParent::ProxyAutoConfigParent",
[proxyAutoConfigParent(mProxyAutoConfigParent),
endpoint{std::move(parent)}]() mutable {
proxyAutoConfigParent->Init(std::move(endpoint));
}));
}
nsresult RemoteProxyAutoConfig::ConfigurePAC(const nsACString& aPACURI,
const nsACString& aPACScriptData,
bool aIncludePath,
uint32_t aExtraHeapSize,
nsIEventTarget*) {
Unused << mProxyAutoConfigParent->SendConfigurePAC(
aPACURI, aPACScriptData, aIncludePath, aExtraHeapSize);
return NS_OK;
}
void RemoteProxyAutoConfig::Shutdown() { mProxyAutoConfigParent->Close(); }
void RemoteProxyAutoConfig::GC() {
// Do nothing. GC would be performed when there is not pending query in socket
// process.
}
void RemoteProxyAutoConfig::GetProxyForURIWithCallback(
const nsACString& aTestURI, const nsACString& aTestHost,
std::function<void(nsresult aStatus, const nsACString& aResult)>&&
aCallback) {
if (!mProxyAutoConfigParent->CanSend()) {
return;
}
mProxyAutoConfigParent->SendGetProxyForURI(
aTestURI, aTestHost,
[aCallback](Tuple<nsresult, nsCString>&& aResult) {
nsresult status;
nsCString result;
Tie(status, result) = aResult;
aCallback(status, result);
},
[aCallback](mozilla::ipc::ResponseRejectReason&& aReason) {
aCallback(NS_ERROR_FAILURE, ""_ns);
});
}
} // namespace net
} // namespace mozilla
View git blame Copy permalink