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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 */
#ifndef nsPACMan_h__
#define nsPACMan_h__
#include "mozilla/Atomics.h"
#include "mozilla/Attributes.h"
#include "mozilla/DataMutex.h"
#include "mozilla/LinkedList.h"
#include "mozilla/Logging.h"
#include "mozilla/net/NeckoTargetHolder.h"
#include "mozilla/TimeStamp.h"
#include "nsCOMPtr.h"
#include "nsIChannelEventSink.h"
#include "nsIInterfaceRequestor.h"
#include "nsIStreamLoader.h"
#include "nsThreadUtils.h"
#include "nsIURI.h"
#include "nsString.h"
#include "ProxyAutoConfig.h"
class nsISystemProxySettings;
class nsIDHCPClient;
class nsIThread;
namespace mozilla {
namespace net {
class nsPACMan;
class WaitForThreadShutdown;
* This class defines a callback interface used by AsyncGetProxyForURI.
class NS_NO_VTABLE nsPACManCallback : public nsISupports {
* This method is invoked on the same thread that called AsyncGetProxyForURI.
* @param status
* This parameter indicates whether or not the PAC query succeeded.
* @param pacString
* This parameter holds the value of the PAC string. It is empty when
* status is a failure code.
* @param newPACURL
* This parameter holds the URL of a new PAC file that should be loaded
* before the query is evaluated again. At least one of pacString and
* newPACURL should be 0 length.
virtual void OnQueryComplete(nsresult status, const nsACString& pacString,
const nsACString& newPACURL) = 0;
class PendingPACQuery final : public Runnable,
public LinkedListElement<PendingPACQuery> {
PendingPACQuery(nsPACMan* pacMan, nsIURI* uri, nsPACManCallback* callback,
uint32_t flags, bool mainThreadResponse);
// can be called from either thread
void Complete(nsresult status, const nsACString& pacString);
void UseAlternatePACFile(const nsACString& pacURL);
nsCString mSpec;
nsCString mScheme;
nsCString mHost;
int32_t mPort;
uint32_t mFlags;
NS_IMETHOD Run(void) override; /* Runnable */
nsPACMan* mPACMan; // weak reference
RefPtr<nsPACManCallback> mCallback;
bool mOnMainThreadOnly;
* This class provides an abstraction layer above the PAC thread. The methods
* defined on this class are intended to be called on the main thread only.
class nsPACMan final : public nsIStreamLoaderObserver,
public nsIInterfaceRequestor,
public nsIChannelEventSink,
public NeckoTargetHolder {
explicit nsPACMan(nsISerialEventTarget* mainThreadEventTarget);
* This method may be called to shutdown the PAC manager. Any async queries
* that have not yet completed will either finish normally or be canceled by
* the time this method returns.
void Shutdown();
* This method queries a PAC result asynchronously. The callback runs on the
* calling thread. If the PAC file has not yet been loaded, then this method
* will queue up the request, and complete it once the PAC file has been
* loaded.
* @param uri
* The URI to query.
* @param callback
* The callback to run once the PAC result is available.
* @param flags
* A bit-wise combination of the RESOLVE_ flags defined above. Pass
* 0 to specify the default behavior.
* @param mustCallbackOnMainThread
* If set to false the callback can be made from the PAC thread
nsresult AsyncGetProxyForURI(nsIURI* uri, nsPACManCallback* callback,
uint32_t flags, bool mustCallbackOnMainThread);
* This method may be called to reload the PAC file. While we are loading
* the PAC file, any asynchronous PAC queries will be queued up to be
* processed once the PAC file finishes loading.
* @param aSpec
* The non normalized uri spec of this URI used for comparison with
* system proxy settings to determine if the PAC uri has changed.
nsresult LoadPACFromURI(const nsACString& aSpec);
* Returns true if we are currently loading the PAC file.
bool IsLoading() {
auto loader = mLoader.Lock();
return loader.ref() != nullptr;
* Returns true if the given URI matches the URI of our PAC file or the
* URI it has been redirected to. In the case of a chain of redirections
* only the current one being followed and the original are considered
* becuase this information is used, respectively, to determine if we
* should bypass the proxy (to fetch the pac file) or if the pac
* configuration has changed (and we should reload the pac file)
bool IsPACURI(const nsACString& spec) {
return mPACURISpec.Equals(spec) || mPACURIRedirectSpec.Equals(spec) ||
bool IsPACURI(nsIURI* uri) {
if (mPACURISpec.IsEmpty() && mPACURIRedirectSpec.IsEmpty()) {
return false;
nsAutoCString tmp;
nsresult rv = uri->GetSpec(tmp);
if (NS_FAILED(rv)) {
return false;
return IsPACURI(tmp);
bool IsUsingWPAD() { return mAutoDetect; }
nsresult Init(nsISystemProxySettings*);
static nsPACMan* sInstance;
// PAC thread operations only
void ProcessPendingQ();
void CancelPendingQ(nsresult, bool aShutdown);
void SetWPADOverDHCPEnabled(bool aValue) { mWPADOverDHCPEnabled = aValue; }
friend class PendingPACQuery;
friend class PACLoadComplete;
friend class ConfigureWPADComplete;
friend class ExecutePACThreadAction;
friend class WaitForThreadShutdown;
friend class TestPACMan;
* Cancel any existing load if any.
void CancelExistingLoad();
* Start loading the PAC file.
void StartLoading();
* Continue loading the PAC file.
void ContinueLoadingAfterPACUriKnown();
* This method may be called to reload the PAC file. While we are loading
* the PAC file, any asynchronous PAC queries will be queued up to be
* processed once the PAC file finishes loading.
* @param aSpec
* The non normalized uri spec of this URI used for comparison with
* system proxy settings to determine if the PAC uri has changed.
* @param aResetLoadFailureCount
* A flag saying whether the exponential back-off for attempting to
* reload the PAC should be reset.
nsresult LoadPACFromURI(const nsACString& aSpec, bool aResetLoadFailureCount);
* Reload the PAC file if there is reason to.
void MaybeReloadPAC();
* Called when we fail to load the PAC file.
void OnLoadFailure();
* PostQuery() only runs on the PAC thread and it is used to
* place a pendingPACQuery into the queue and potentially
* execute the queue if it was otherwise empty
nsresult PostQuery(PendingPACQuery* query);
// Having found the PAC URI on the PAC thread, copy it to a string which
// can be altered on the main thread.
void AssignPACURISpec(const nsACString& aSpec);
// PAC thread operations only
void PostProcessPendingQ();
void PostCancelPendingQ(nsresult, bool aShutdown = false);
bool ProcessPending();
nsresult GetPACFromDHCP(nsACString& aSpec);
nsresult ConfigureWPAD(nsACString& aSpec);
* Dispatches a runnable to the PAC processing thread. Handles lazy
* instantiation of the thread.
* @param aEvent The event to disptach.
* @param aSync Whether or not this should be synchronous dispatch.
nsresult DispatchToPAC(already_AddRefed<nsIRunnable> aEvent,
bool aSync = false);
ProxyAutoConfig mPAC;
nsCOMPtr<nsIThread> mPACThread;
nsCOMPtr<nsISystemProxySettings> mSystemProxySettings;
nsCOMPtr<nsIDHCPClient> mDHCPClient;
LinkedList<PendingPACQuery> mPendingQ; /* pac thread only */
// These specs are not nsIURI so that they can be used off the main thread.
// The non-normalized versions are directly from the configuration, the
// normalized version has been extracted from an nsIURI
nsCString mPACURISpec;
nsCString mPACURIRedirectSpec;
nsCString mNormalPACURISpec;
DataMutex<nsCOMPtr<nsIStreamLoader>> mLoader;
bool mLoadPending;
Atomic<bool, Relaxed> mShutdown;
TimeStamp mScheduledReload;
uint32_t mLoadFailureCount;
bool mInProgress;
bool mIncludePath;
bool mAutoDetect;
bool mWPADOverDHCPEnabled;
int32_t mProxyConfigType;
extern LazyLogModule gProxyLog;
} // namespace net
} // namespace mozilla
#endif // nsPACMan_h__