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gecko/toolkit/components/url-classifier/nsUrlClassifierDBService.cpp

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//* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Url Classifier code
*
* The Initial Developer of the Original Code is
* Google Inc.
* Portions created by the Initial Developer are Copyright (C) 2006
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Tony Chang <tony@ponderer.org> (original author)
* Brett Wilson <brettw@gmail.com>
* Dave Camp <dcamp@mozilla.com>
* David Dahl <ddahl@mozilla.com>
* Gian-Carlo Pascutto <gpascutto@mozilla.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsAutoPtr.h"
#include "nsCOMPtr.h"
#include "mozIStorageService.h"
#include "mozIStorageConnection.h"
#include "mozIStorageStatement.h"
#include "mozStorageHelper.h"
#include "mozStorageCID.h"
#include "nsAppDirectoryServiceDefs.h"
#include "nsCRT.h"
#include "nsDataHashtable.h"
#include "nsICryptoHash.h"
#include "nsICryptoHMAC.h"
#include "nsIDirectoryService.h"
#include "nsIKeyModule.h"
#include "nsIObserverService.h"
#include "nsIPermissionManager.h"
#include "nsIPrefBranch.h"
#include "nsIPrefBranch2.h"
#include "nsIPrefService.h"
#include "nsIProperties.h"
#include "nsToolkitCompsCID.h"
#include "nsIUrlClassifierUtils.h"
#include "nsIRandomGenerator.h"
#include "nsUrlClassifierDBService.h"
#include "nsUrlClassifierUtils.h"
#include "nsUrlClassifierProxies.h"
#include "nsURILoader.h"
#include "nsString.h"
#include "nsReadableUtils.h"
#include "nsTArray.h"
#include "nsNetUtil.h"
#include "nsNetCID.h"
#include "nsThreadUtils.h"
#include "nsXPCOMStrings.h"
#include "mozilla/Mutex.h"
#include "mozilla/Telemetry.h"
#include "prlog.h"
#include "prprf.h"
#include "prnetdb.h"
#include "zlib.h"
// Needed to interpert mozIStorageConnection::GetLastError
#include <sqlite3.h>
using namespace mozilla;
/**
* The DBServices stores a set of Fragments. A fragment is one URL
* fragment containing two or more domain components and some number
* of path components.
*
* Fragment examples:
* example.com/
* www.example.com/foo/bar
* www.mail.example.com/mail
*
* Fragments are described in "Simplified Regular Expression Lookup"
* section of the protocol document at
* http://code.google.com/p/google-safe-browsing/wiki/Protocolv2Spec
*
* A fragment is associated with a domain. The domain for a given
* fragment is the three-host-component domain of the fragment (two
* host components for URLs with only two components) with a trailing
* slash. So for the fragments listed above, the domains are
* example.com/, www.example.com/ and mail.example.com/.
*
* Fragments and domains are hashed in the database. The hash is described
* in the protocol document, but it's basically a truncated SHA256 hash.
*
* A (table, chunk id, domain key, fragment) tuple is referred to as
* an Entry.
*/
// NSPR_LOG_MODULES=UrlClassifierDbService:5
#if defined(PR_LOGGING)
static const PRLogModuleInfo *gUrlClassifierDbServiceLog = nsnull;
#define LOG(args) PR_LOG(gUrlClassifierDbServiceLog, PR_LOG_DEBUG, args)
#define LOG_ENABLED() PR_LOG_TEST(gUrlClassifierDbServiceLog, 4)
#else
#define LOG(args)
#define LOG_ENABLED() (false)
#endif
// Schema versioning: note that we don't bother to migrate between different
// versions of the schema, we just start fetching the data freshly with each
// migration.
// The database filename is updated when there is an incompatible
// schema change and we expect both implementations to continue
// accessing the same database (such as between stable versions of the
// platform).
#define DATABASE_FILENAME "urlclassifier3.sqlite"
// The implementation version is updated during development when we
// want to change schema, or to recover from updating bugs. When an
// implementation version change is detected, the database is scrapped
// and we start over.
#define IMPLEMENTATION_VERSION 7
// Name of the persistent PrefixSet storage
#define PREFIXSET_FILENAME "urlclassifier.pset"
#define MAX_HOST_COMPONENTS 5
#define MAX_PATH_COMPONENTS 4
// Updates will fail if fed chunks larger than this
#define MAX_CHUNK_SIZE (1024 * 1024)
// Prefs for implementing nsIURIClassifier to block page loads
#define CHECK_MALWARE_PREF "browser.safebrowsing.malware.enabled"
#define CHECK_MALWARE_DEFAULT false
#define CHECK_PHISHING_PREF "browser.safebrowsing.enabled"
#define CHECK_PHISHING_DEFAULT false
#define GETHASH_NOISE_PREF "urlclassifier.gethashnoise"
#define GETHASH_NOISE_DEFAULT 4
#define GETHASH_TABLES_PREF "urlclassifier.gethashtables"
#define CONFIRM_AGE_PREF "urlclassifier.confirm-age"
#define CONFIRM_AGE_DEFAULT_SEC (45 * 60)
#define UPDATE_CACHE_SIZE_PREF "urlclassifier.updatecachemax"
#define UPDATE_CACHE_SIZE_DEFAULT -1
#define LOOKUP_CACHE_SIZE_PREF "urlclassifier.lookupcachemax"
#define LOOKUP_CACHE_SIZE_DEFAULT -1
// Amount of time to spend updating before committing and delaying, in
// seconds. This is checked after each update stream, so the actual
// time spent can be higher than this, depending on update stream size.
#define UPDATE_WORKING_TIME "urlclassifier.workingtime"
#define UPDATE_WORKING_TIME_DEFAULT 5
// The amount of time to delay after hitting UPDATE_WORKING_TIME, in
// seconds.
#define UPDATE_DELAY_TIME "urlclassifier.updatetime"
#define UPDATE_DELAY_TIME_DEFAULT 60
class nsUrlClassifierDBServiceWorker;
// Singleton instance.
static nsUrlClassifierDBService* sUrlClassifierDBService;
nsIThread* nsUrlClassifierDBService::gDbBackgroundThread = nsnull;
// Once we've committed to shutting down, don't do work in the background
// thread.
static bool gShuttingDownThread = false;
static PRInt32 gFreshnessGuarantee = CONFIRM_AGE_DEFAULT_SEC;
static PRInt32 gUpdateCacheSize = UPDATE_CACHE_SIZE_DEFAULT;
static PRInt32 gLookupCacheSize = LOOKUP_CACHE_SIZE_DEFAULT;
static PRInt32 gWorkingTimeThreshold = UPDATE_WORKING_TIME_DEFAULT;
static PRInt32 gDelayTime = UPDATE_DELAY_TIME_DEFAULT;
static void
SplitTables(const nsACString& str, nsTArray<nsCString>& tables)
{
tables.Clear();
nsACString::const_iterator begin, iter, end;
str.BeginReading(begin);
str.EndReading(end);
while (begin != end) {
iter = begin;
FindCharInReadable(',', iter, end);
tables.AppendElement(Substring(begin, iter));
begin = iter;
if (begin != end)
begin++;
}
}
// -------------------------------------------------------------------------
// Hash class implementation
// A convenience wrapper around the potentially-truncated hash for a
// domain or fragment.
template <PRUint32 S>
struct nsUrlClassifierHash
{
static const PRUint32 sHashSize = S;
typedef nsUrlClassifierHash<S> self_type;
PRUint8 buf[S];
nsresult FromPlaintext(const nsACString& plainText, nsICryptoHash *hash) {
// From the protocol doc:
// Each entry in the chunk is composed of the 128 most significant bits
// of the SHA 256 hash of a suffix/prefix expression.
nsresult rv = hash->Init(nsICryptoHash::SHA256);
NS_ENSURE_SUCCESS(rv, rv);
rv = hash->Update
(reinterpret_cast<const PRUint8*>(plainText.BeginReading()),
plainText.Length());
NS_ENSURE_SUCCESS(rv, rv);
nsCAutoString hashed;
rv = hash->Finish(false, hashed);
NS_ENSURE_SUCCESS(rv, rv);
NS_ASSERTION(hashed.Length() >= sHashSize,
"not enough characters in the hash");
memcpy(buf, hashed.BeginReading(), sHashSize);
return NS_OK;
}
void Assign(const nsACString& str) {
NS_ASSERTION(str.Length() >= sHashSize,
"string must be at least sHashSize characters long");
memcpy(buf, str.BeginReading(), sHashSize);
}
void Clear() {
memset(buf, 0, sizeof(buf));
}
const bool operator==(const self_type& hash) const {
return (memcmp(buf, hash.buf, sizeof(buf)) == 0);
}
const bool operator!=(const self_type& hash) const {
return !(*this == hash);
}
const bool operator<(const self_type& hash) const {
return memcmp(buf, hash.buf, sizeof(self_type)) < 0;
}
const bool StartsWith(const nsUrlClassifierHash<PARTIAL_LENGTH>& hash) const {
NS_ASSERTION(sHashSize >= PARTIAL_LENGTH, "nsUrlClassifierHash must be at least PARTIAL_LENGTH bytes long");
return memcmp(buf, hash.buf, PARTIAL_LENGTH) == 0;
}
PRUint32 ToUint32() const {
return *(reinterpret_cast<const PRUint32*>(buf));
}
};
typedef nsUrlClassifierHash<DOMAIN_LENGTH> nsUrlClassifierDomainHash;
typedef nsUrlClassifierHash<PARTIAL_LENGTH> nsUrlClassifierPartialHash;
typedef nsUrlClassifierHash<COMPLETE_LENGTH> nsUrlClassifierCompleteHash;
// -------------------------------------------------------------------------
// Entry class implementation
// This class represents one entry in the classifier database. It consists
// of a table id, a chunk id, a domain hash, and a partial or complete hash.
class nsUrlClassifierEntry
{
public:
nsUrlClassifierEntry()
: mId(-1)
, mHavePartial(false)
, mHaveComplete(false)
, mTableId(0)
, mChunkId(0)
, mAddChunkId(0)
{}
~nsUrlClassifierEntry() {}
// Check that this entry could potentially match the complete hash.
bool Match(const nsUrlClassifierCompleteHash &hash);
// Check that the sub entry should apply to this entry.
bool SubMatch(const nsUrlClassifierEntry& sub);
// Clear out the entry structure
void Clear();
// Set the partial hash for this domain.
void SetHash(const nsUrlClassifierPartialHash &partialHash) {
mPartialHash = partialHash;
mHavePartial = true;
}
// Set the complete hash for this domain.
void SetHash(const nsUrlClassifierCompleteHash &completeHash) {
mCompleteHash = completeHash;
mHaveComplete = true;
}
bool operator== (const nsUrlClassifierEntry& entry) const {
return ! (mTableId != entry.mTableId ||
mChunkId != entry.mChunkId ||
mHavePartial != entry.mHavePartial ||
(mHavePartial && mPartialHash != entry.mPartialHash) ||
mHaveComplete != entry.mHaveComplete ||
(mHaveComplete && mCompleteHash != entry.mCompleteHash));
}
bool operator< (const nsUrlClassifierEntry& entry) const {
return (mTableId < entry.mTableId ||
mChunkId < entry.mChunkId ||
mHavePartial && !entry.mHavePartial ||
(mHavePartial && mPartialHash < entry.mPartialHash) ||
mHaveComplete && !entry.mHaveComplete ||
(mHaveComplete && mCompleteHash < entry.mCompleteHash));
}
PRInt64 mId;
nsUrlClassifierDomainHash mKey;
bool mHavePartial;
nsUrlClassifierPartialHash mPartialHash;
bool mHaveComplete;
nsUrlClassifierCompleteHash mCompleteHash;
PRUint32 mTableId;
PRUint32 mChunkId;
PRUint32 mAddChunkId;
};
bool
nsUrlClassifierEntry::Match(const nsUrlClassifierCompleteHash &hash)
{
if (mHaveComplete)
return mCompleteHash == hash;
if (mHavePartial)
return hash.StartsWith(mPartialHash);
return false;
}
bool
nsUrlClassifierEntry::SubMatch(const nsUrlClassifierEntry &subEntry)
{
if ((mTableId != subEntry.mTableId) || (mChunkId != subEntry.mAddChunkId))
return false;
if (subEntry.mHaveComplete)
return mHaveComplete && mCompleteHash == subEntry.mCompleteHash;
if (subEntry.mHavePartial)
return mHavePartial && mPartialHash == subEntry.mPartialHash;
return false;
}
void
nsUrlClassifierEntry::Clear()
{
mId = -1;
mHavePartial = false;
mHaveComplete = false;
}
// -------------------------------------------------------------------------
// Lookup result class implementation
// This helper class wraps a nsUrlClassifierEntry found during a lookup.
class nsUrlClassifierLookupResult
{
public:
nsUrlClassifierLookupResult() : mConfirmed(false), mNoise(false) {
mLookupFragment.Clear();
}
~nsUrlClassifierLookupResult() {}
bool operator==(const nsUrlClassifierLookupResult &result) const {
// Don't need to compare table name, it's contained by id in the entry.
return (mLookupFragment == result.mLookupFragment &&
mConfirmed == result.mConfirmed &&
mEntry == result.mEntry);
}
bool operator<(const nsUrlClassifierLookupResult &result) const {
// Don't need to compare table name, it's contained by id in the entry.
return (mLookupFragment < result.mLookupFragment ||
mConfirmed < result.mConfirmed ||
mEntry < result.mEntry);
}
// The hash that matched this entry.
nsUrlClassifierCompleteHash mLookupFragment;
// The entry that was found during the lookup.
nsUrlClassifierEntry mEntry;
// TRUE if the lookup matched a complete hash (not just a partial
// one).
bool mConfirmed;
// TRUE if this lookup is gethash noise. Does not represent an actual
// result.
bool mNoise;
// The table name associated with mEntry.mTableId.
nsCString mTableName;
};
// -------------------------------------------------------------------------
// Store class implementation
// This class mediates access to the classifier and chunk entry tables.
class nsUrlClassifierStore
{
public:
nsUrlClassifierStore() {}
virtual ~nsUrlClassifierStore() {}
// Initialize the statements for the store.
nsresult Init(nsUrlClassifierDBServiceWorker *worker,
mozIStorageConnection *connection,
const nsACString& entriesTableName);
// Shut down the store.
void Close();
// Read an entry from a database statement
virtual bool ReadStatement(mozIStorageStatement* statement,
nsUrlClassifierEntry& entry);
// Prepare a statement to write this entry to the database
virtual nsresult BindStatement(const nsUrlClassifierEntry& entry,
mozIStorageStatement* statement);
// Read the entry with a given ID from the database
nsresult ReadEntry(PRInt64 id, nsUrlClassifierEntry& entry, bool *exists);
// Remove an entry from the database
nsresult DeleteEntry(nsUrlClassifierEntry& entry);
// Write an entry to the database
nsresult WriteEntry(nsUrlClassifierEntry& entry);
// Update an entry in the database. The entry must already exist in the
// database or this method will fail.
nsresult UpdateEntry(nsUrlClassifierEntry& entry);
// Remove all entries for a given table/chunk pair from the database.
nsresult Expire(PRUint32 tableId,
PRUint32 chunkNum);
// Read a certain number of rows adjacent to the requested rowid that
// don't have complete hash data.
nsresult ReadNoiseEntries(PRInt64 rowID,
PRUint32 numRequested,
bool before,
nsTArray<nsUrlClassifierEntry> &entries);
// Return an array with all Prefixes known
nsresult ReadPrefixes(nsTArray<PRUint32>& array, PRUint32 aKey);
protected:
nsresult ReadEntries(mozIStorageStatement *statement,
nsTArray<nsUrlClassifierEntry>& entries);
nsUrlClassifierDBServiceWorker *mWorker;
nsCOMPtr<mozIStorageConnection> mConnection;
nsCOMPtr<mozIStorageStatement> mLookupWithIDStatement;
nsCOMPtr<mozIStorageStatement> mInsertStatement;
nsCOMPtr<mozIStorageStatement> mUpdateStatement;
nsCOMPtr<mozIStorageStatement> mDeleteStatement;
nsCOMPtr<mozIStorageStatement> mExpireStatement;
nsCOMPtr<mozIStorageStatement> mPartialEntriesStatement;
nsCOMPtr<mozIStorageStatement> mPartialEntriesAfterStatement;
nsCOMPtr<mozIStorageStatement> mLastPartialEntriesStatement;
nsCOMPtr<mozIStorageStatement> mPartialEntriesBeforeStatement;
nsCOMPtr<mozIStorageStatement> mAllPrefixStatement;
};
nsresult
nsUrlClassifierStore::Init(nsUrlClassifierDBServiceWorker *worker,
mozIStorageConnection *connection,
const nsACString& entriesName)
{
mWorker = worker;
mConnection = connection;
nsresult rv = mConnection->CreateStatement
(NS_LITERAL_CSTRING("SELECT * FROM ") + entriesName +
NS_LITERAL_CSTRING(" WHERE id=?1"),
getter_AddRefs(mLookupWithIDStatement));
NS_ENSURE_SUCCESS(rv, rv);
rv = mConnection->CreateStatement
(NS_LITERAL_CSTRING("DELETE FROM ") + entriesName +
NS_LITERAL_CSTRING(" WHERE id=?1"),
getter_AddRefs(mDeleteStatement));
NS_ENSURE_SUCCESS(rv, rv);
rv = mConnection->CreateStatement
(NS_LITERAL_CSTRING("DELETE FROM ") + entriesName +
NS_LITERAL_CSTRING(" WHERE table_id=?1 AND chunk_id=?2"),
getter_AddRefs(mExpireStatement));
NS_ENSURE_SUCCESS(rv, rv);
rv = mConnection->CreateStatement
(NS_LITERAL_CSTRING("SELECT * FROM ") + entriesName +
NS_LITERAL_CSTRING(" WHERE complete_data ISNULL"
" LIMIT ?1"),
getter_AddRefs(mPartialEntriesStatement));
NS_ENSURE_SUCCESS(rv, rv);
rv = mConnection->CreateStatement
(NS_LITERAL_CSTRING("SELECT * FROM ") + entriesName +
NS_LITERAL_CSTRING(" WHERE id > ?1 AND complete_data ISNULL"
" LIMIT ?2"),
getter_AddRefs(mPartialEntriesAfterStatement));
NS_ENSURE_SUCCESS(rv, rv);
rv = mConnection->CreateStatement
(NS_LITERAL_CSTRING("SELECT * FROM ") + entriesName +
NS_LITERAL_CSTRING(" WHERE complete_data ISNULL"
" ORDER BY id DESC LIMIT ?1"),
getter_AddRefs(mLastPartialEntriesStatement));
NS_ENSURE_SUCCESS(rv, rv);
rv = mConnection->CreateStatement
(NS_LITERAL_CSTRING("SELECT * FROM ") + entriesName +
NS_LITERAL_CSTRING(" WHERE id < ?1 AND complete_data ISNULL"
" ORDER BY id DESC LIMIT ?2"),
getter_AddRefs(mPartialEntriesBeforeStatement));
NS_ENSURE_SUCCESS(rv, rv);
rv = mConnection->CreateStatement
(NS_LITERAL_CSTRING("SELECT domain, partial_data, complete_data FROM ")
+ entriesName,
getter_AddRefs(mAllPrefixStatement));
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
void
nsUrlClassifierStore::Close()
{
mLookupWithIDStatement = nsnull;
mInsertStatement = nsnull;
mUpdateStatement = nsnull;
mDeleteStatement = nsnull;
mExpireStatement = nsnull;
mPartialEntriesStatement = nsnull;
mPartialEntriesAfterStatement = nsnull;
mPartialEntriesBeforeStatement = nsnull;
mLastPartialEntriesStatement = nsnull;
mAllPrefixStatement = nsnull;
mConnection = nsnull;
}
bool
nsUrlClassifierStore::ReadStatement(mozIStorageStatement* statement,
nsUrlClassifierEntry& entry)
{
entry.mId = statement->AsInt64(0);
PRUint32 size;
const PRUint8* blob = statement->AsSharedBlob(1, &size);
if (!blob || (size != DOMAIN_LENGTH))
return false;
memcpy(entry.mKey.buf, blob, DOMAIN_LENGTH);
blob = statement->AsSharedBlob(2, &size);
if (!blob || size == 0) {
entry.mHavePartial = false;
} else {
if (size != PARTIAL_LENGTH)
return false;
entry.mHavePartial = true;
memcpy(entry.mPartialHash.buf, blob, PARTIAL_LENGTH);
}
blob = statement->AsSharedBlob(3, &size);
if (!blob || size == 0) {
entry.mHaveComplete = false;
} else {
if (size != COMPLETE_LENGTH)
return false;
entry.mHaveComplete = true;
memcpy(entry.mCompleteHash.buf, blob, COMPLETE_LENGTH);
}
// If we only have a partial entry, and that partial entry matches the
// domain, we don't save the extra copy to the database.
if (!(entry.mHavePartial || entry.mHaveComplete)) {
entry.SetHash(entry.mKey);
}
entry.mChunkId = statement->AsInt32(4);
entry.mTableId = statement->AsInt32(5);
return true;
}
nsresult
nsUrlClassifierStore::BindStatement(const nsUrlClassifierEntry &entry,
mozIStorageStatement* statement)
{
nsresult rv;
if (entry.mId == -1)
rv = statement->BindNullByIndex(0);
else
rv = statement->BindInt64ByIndex(0, entry.mId);
NS_ENSURE_SUCCESS(rv, rv);
rv = statement->BindBlobByIndex(1, entry.mKey.buf, DOMAIN_LENGTH);
NS_ENSURE_SUCCESS(rv, rv);
if (entry.mHavePartial) {
// If we only have a partial entry and that entry matches the domain,
// we'll save some space by only storing the domain hash.
if (!entry.mHaveComplete && entry.mKey == entry.mPartialHash) {
rv = statement->BindNullByIndex(2);
} else {
rv = statement->BindBlobByIndex(2, entry.mPartialHash.buf,
PARTIAL_LENGTH);
}
} else {
rv = statement->BindNullByIndex(2);
}
NS_ENSURE_SUCCESS(rv, rv);
if (entry.mHaveComplete) {
rv = statement->BindBlobByIndex(3, entry.mCompleteHash.buf, COMPLETE_LENGTH);
} else {
rv = statement->BindNullByIndex(3);
}
NS_ENSURE_SUCCESS(rv, rv);
rv = statement->BindInt32ByIndex(4, entry.mChunkId);
NS_ENSURE_SUCCESS(rv, rv);
rv = statement->BindInt32ByIndex(5, entry.mTableId);
NS_ENSURE_SUCCESS(rv, rv);
return true;
}
nsresult
nsUrlClassifierStore::ReadEntries(mozIStorageStatement *statement,
nsTArray<nsUrlClassifierEntry>& entries)
{
bool exists;
nsresult rv = statement->ExecuteStep(&exists);
NS_ENSURE_SUCCESS(rv, rv);
while (exists) {
nsUrlClassifierEntry *entry = entries.AppendElement();
if (!entry) {
return NS_ERROR_OUT_OF_MEMORY;
}
if (!ReadStatement(statement, *entry))
return NS_ERROR_FAILURE;
statement->ExecuteStep(&exists);
}
return NS_OK;
}
nsresult
nsUrlClassifierStore::ReadEntry(PRInt64 id,
nsUrlClassifierEntry& entry,
bool *exists)
{
entry.Clear();
mozStorageStatementScoper scoper(mLookupWithIDStatement);
nsresult rv = mLookupWithIDStatement->BindInt64ByIndex(0, id);
NS_ENSURE_SUCCESS(rv, rv);
rv = mLookupWithIDStatement->ExecuteStep(exists);
NS_ENSURE_SUCCESS(rv, rv);
if (*exists) {
if (ReadStatement(mLookupWithIDStatement, entry))
return NS_ERROR_FAILURE;
}
return NS_OK;
}
nsresult
nsUrlClassifierStore::ReadNoiseEntries(PRInt64 rowID,
PRUint32 numRequested,
bool before,
nsTArray<nsUrlClassifierEntry> &entries)
{
if (numRequested == 0) {
return NS_OK;
}
mozIStorageStatement *statement =
before ? mPartialEntriesBeforeStatement : mPartialEntriesAfterStatement;
mozStorageStatementScoper scoper(statement);
nsresult rv = statement->BindInt64ByIndex(0, rowID);
NS_ENSURE_SUCCESS(rv, rv);
statement->BindInt32ByIndex(1, numRequested);
NS_ENSURE_SUCCESS(rv, rv);
PRUint32 length = entries.Length();
rv = ReadEntries(statement, entries);
NS_ENSURE_SUCCESS(rv, rv);
PRUint32 numRead = entries.Length() - length;
if (numRead >= numRequested)
return NS_OK;
// If we didn't get enough entries, we need the search to wrap around from
// beginning to end (or vice-versa)
mozIStorageStatement *wraparoundStatement =
before ? mPartialEntriesStatement : mLastPartialEntriesStatement;
mozStorageStatementScoper wraparoundScoper(wraparoundStatement);
rv = wraparoundStatement->BindInt32ByIndex(0, numRequested - numRead);
NS_ENSURE_SUCCESS(rv, rv);
return ReadEntries(wraparoundStatement, entries);
}
// -------------------------------------------------------------------------
// nsUrlClassifierAddStore class implementation
// This class accesses the moz_classifier table.
class nsUrlClassifierAddStore: public nsUrlClassifierStore
{
public:
nsUrlClassifierAddStore() {};
virtual ~nsUrlClassifierAddStore() {};
nsresult Init(nsUrlClassifierDBServiceWorker *worker,
mozIStorageConnection *connection,
const nsACString& entriesTableName);
void Close();
// Read the entries for a given key/table/chunk from the database
nsresult ReadAddEntries(const nsUrlClassifierDomainHash& key,
PRUint32 tableId,
PRUint32 chunkId,
nsTArray<nsUrlClassifierEntry>& entry);
// Read the entries for a given host key from the database.
nsresult ReadAddEntries(const nsUrlClassifierDomainHash& key,
nsTArray<nsUrlClassifierEntry>& entry);
protected:
nsCOMPtr<mozIStorageStatement> mLookupStatement;
nsCOMPtr<mozIStorageStatement> mLookupWithChunkStatement;
};
nsresult
nsUrlClassifierAddStore::Init(nsUrlClassifierDBServiceWorker *worker,
mozIStorageConnection *connection,
const nsACString &entriesTableName)
{
nsresult rv = nsUrlClassifierStore::Init(worker, connection,
entriesTableName);
NS_ENSURE_SUCCESS(rv, rv);
rv = mConnection->CreateStatement
(NS_LITERAL_CSTRING("INSERT OR REPLACE INTO ") + entriesTableName +
NS_LITERAL_CSTRING(" VALUES (?1, ?2, ?3, ?4, ?5, ?6)"),
getter_AddRefs(mInsertStatement));
NS_ENSURE_SUCCESS(rv, rv);
rv = mConnection->CreateStatement
(NS_LITERAL_CSTRING("UPDATE ") + entriesTableName +
NS_LITERAL_CSTRING(" SET domain=?2, partial_data=?3, "
" complete_data=?4, chunk_id=?5, table_id=?6"
" WHERE id=?1"),
getter_AddRefs(mUpdateStatement));
NS_ENSURE_SUCCESS(rv, rv);
rv = mConnection->CreateStatement
(NS_LITERAL_CSTRING("SELECT * FROM ") + entriesTableName +
NS_LITERAL_CSTRING(" WHERE domain=?1"),
getter_AddRefs(mLookupStatement));
NS_ENSURE_SUCCESS(rv, rv);
rv = mConnection->CreateStatement
(NS_LITERAL_CSTRING("SELECT * FROM ") + entriesTableName +
NS_LITERAL_CSTRING(" WHERE domain=?1 AND table_id=?2 AND chunk_id=?3"),
getter_AddRefs(mLookupWithChunkStatement));
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
void
nsUrlClassifierAddStore::Close()
{
nsUrlClassifierStore::Close();
mLookupStatement = nsnull;
mLookupWithChunkStatement = nsnull;
}
nsresult
nsUrlClassifierAddStore::ReadAddEntries(const nsUrlClassifierDomainHash& hash,
PRUint32 tableId,
PRUint32 chunkId,
nsTArray<nsUrlClassifierEntry>& entries)
{
mozStorageStatementScoper scoper(mLookupWithChunkStatement);
nsresult rv = mLookupWithChunkStatement->BindBlobByIndex
(0, hash.buf, DOMAIN_LENGTH);
NS_ENSURE_SUCCESS(rv, rv);
rv = mLookupWithChunkStatement->BindInt32ByIndex(1, tableId);
NS_ENSURE_SUCCESS(rv, rv);
rv = mLookupWithChunkStatement->BindInt32ByIndex(2, chunkId);
NS_ENSURE_SUCCESS(rv, rv);
return ReadEntries(mLookupWithChunkStatement, entries);
}
nsresult
nsUrlClassifierAddStore::ReadAddEntries(const nsUrlClassifierDomainHash& hash,
nsTArray<nsUrlClassifierEntry>& entries)
{
mozStorageStatementScoper scoper(mLookupStatement);
nsresult rv = mLookupStatement->BindBlobByIndex
(0, hash.buf, DOMAIN_LENGTH);
NS_ENSURE_SUCCESS(rv, rv);
return ReadEntries(mLookupStatement, entries);
}
// -------------------------------------------------------------------------
// nsUrlClassifierSubStore class implementation
// This class accesses the moz_subs table.
class nsUrlClassifierSubStore : public nsUrlClassifierStore
{
public:
nsUrlClassifierSubStore() {};
virtual ~nsUrlClassifierSubStore() {};
nsresult Init(nsUrlClassifierDBServiceWorker *worker,
mozIStorageConnection *connection,
const nsACString& entriesTableName);
void Close();
// Read an entry from a database statement
virtual bool ReadStatement(mozIStorageStatement* statement,
nsUrlClassifierEntry& entry);
// Prepare a statement to write this entry to the database
virtual nsresult BindStatement(const nsUrlClassifierEntry& entry,
mozIStorageStatement* statement);
// Read sub entries for a given add chunk
nsresult ReadSubEntries(PRUint32 tableId, PRUint32 chunkId,
nsTArray<nsUrlClassifierEntry> &subEntry);
// Expire sub entries for a given add chunk
nsresult ExpireAddChunk(PRUint32 tableId, PRUint32 chunkId);
protected:
nsCOMPtr<mozIStorageStatement> mLookupWithAddChunkStatement;
nsCOMPtr<mozIStorageStatement> mExpireAddChunkStatement;
};
nsresult
nsUrlClassifierSubStore::Init(nsUrlClassifierDBServiceWorker *worker,
mozIStorageConnection *connection,
const nsACString &entriesTableName)
{
nsresult rv = nsUrlClassifierStore::Init(worker, connection,
entriesTableName);
NS_ENSURE_SUCCESS(rv, rv);
rv = mConnection->CreateStatement
(NS_LITERAL_CSTRING("INSERT OR REPLACE INTO ") + entriesTableName +
NS_LITERAL_CSTRING(" VALUES (?1, ?2, ?3, ?4, ?5, ?6, ?7)"),
getter_AddRefs(mInsertStatement));
NS_ENSURE_SUCCESS(rv, rv);
rv = mConnection->CreateStatement
(NS_LITERAL_CSTRING("UPDATE ") + entriesTableName +
NS_LITERAL_CSTRING(" SET domain=?2, partial_data=?3, complete_data=?4,"
" chunk_id=?5, table_id=?6, add_chunk_id=?7"
" WHERE id=?1"),
getter_AddRefs(mUpdateStatement));
NS_ENSURE_SUCCESS(rv, rv);
rv = mConnection->CreateStatement
(NS_LITERAL_CSTRING("SELECT * FROM ") + entriesTableName +
NS_LITERAL_CSTRING(" WHERE table_id=?1 AND add_chunk_id=?2"),
getter_AddRefs(mLookupWithAddChunkStatement));
NS_ENSURE_SUCCESS(rv, rv);
rv = mConnection->CreateStatement
(NS_LITERAL_CSTRING("DELETE FROM ") + entriesTableName +
NS_LITERAL_CSTRING(" WHERE table_id=?1 AND add_chunk_id=?2"),
getter_AddRefs(mExpireAddChunkStatement));
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
bool
nsUrlClassifierSubStore::ReadStatement(mozIStorageStatement* statement,
nsUrlClassifierEntry& entry)
{
if (!nsUrlClassifierStore::ReadStatement(statement, entry))
return false;
entry.mAddChunkId = statement->AsInt32(6);
return true;
}
nsresult
nsUrlClassifierSubStore::BindStatement(const nsUrlClassifierEntry& entry,
mozIStorageStatement* statement)
{
nsresult rv = nsUrlClassifierStore::BindStatement(entry, statement);
NS_ENSURE_SUCCESS(rv, rv);
return statement->BindInt32ByIndex(6, entry.mAddChunkId);
}
nsresult
nsUrlClassifierSubStore::ReadSubEntries(PRUint32 tableId, PRUint32 addChunkId,
nsTArray<nsUrlClassifierEntry>& entries)
{
mozStorageStatementScoper scoper(mLookupWithAddChunkStatement);
nsresult rv = mLookupWithAddChunkStatement->BindInt32ByIndex(0, tableId);
NS_ENSURE_SUCCESS(rv, rv);
rv = mLookupWithAddChunkStatement->BindInt32ByIndex(1, addChunkId);
NS_ENSURE_SUCCESS(rv, rv);
return ReadEntries(mLookupWithAddChunkStatement, entries);
}
nsresult
nsUrlClassifierSubStore::ExpireAddChunk(PRUint32 tableId, PRUint32 addChunkId)
{
mozStorageStatementScoper scoper(mExpireAddChunkStatement);
nsresult rv = mExpireAddChunkStatement->BindInt32ByIndex(0, tableId);
NS_ENSURE_SUCCESS(rv, rv);
rv = mExpireAddChunkStatement->BindInt32ByIndex(1, addChunkId);
NS_ENSURE_SUCCESS(rv, rv);
return mExpireAddChunkStatement->Execute();
}
void
nsUrlClassifierSubStore::Close()
{
nsUrlClassifierStore::Close();
mLookupWithAddChunkStatement = nsnull;
mExpireAddChunkStatement = nsnull;
}
// Similar to GetKey(), but if the domain contains three or more components,
// two keys will be returned:
// hostname.com/foo/bar -> [hostname.com]
// mail.hostname.com/foo/bar -> [hostname.com, mail.hostname.com]
// www.mail.hostname.com/foo/bar -> [hostname.com, mail.hostname.com]
static nsresult GetHostKeys(const nsACString &spec,
nsTArray<nsCString> &hostKeys);
// take a lookup string (www.hostname.com/path/to/resource.html) and
// expand it into the set of fragments that should be searched for in an
// entry
static nsresult GetLookupFragments(const nsCSubstring& spec,
nsTArray<nsCString>& fragments);
// Check for a canonicalized IP address.
static bool IsCanonicalizedIP(const nsACString& host);
// Get the database key for a given URI. This is the top three
// domain components if they exist, otherwise the top two.
// hostname.com/foo/bar -> hostname.com
// mail.hostname.com/foo/bar -> mail.hostname.com
// www.mail.hostname.com/foo/bar -> mail.hostname.com
static nsresult GetKey(const nsACString& spec, nsUrlClassifierDomainHash& hash,
nsICryptoHash * aCryptoHash);
// We have both a prefix and a domain. Drop the domain, but
// hash the domain, the prefix and a random value together,
// ensuring any collisions happens at a different points for
// different users.
static nsresult KeyedHash(PRUint32 aPref, PRUint32 aDomain,
PRUint32 aKey, PRUint32 *aOut);
// -------------------------------------------------------------------------
// Actual worker implemenatation
class nsUrlClassifierDBServiceWorker : public nsIUrlClassifierDBServiceWorker
{
public:
nsUrlClassifierDBServiceWorker();
NS_DECL_ISUPPORTS
NS_DECL_NSIURLCLASSIFIERDBSERVICE
NS_DECL_NSIURLCLASSIFIERDBSERVICEWORKER
// Initialize, called in the main thread
nsresult Init(PRInt32 gethashNoise,
nsRefPtr<nsUrlClassifierPrefixSet> & prefSet);
// Queue a lookup for the worker to perform, called in the main thread.
nsresult QueueLookup(const nsACString& lookupKey,
nsIUrlClassifierLookupCallback* callback);
// Handle any queued-up lookups. We call this function during long-running
// update operations to prevent lookups from blocking for too long.
nsresult HandlePendingLookups();
private:
// No subclassing
~nsUrlClassifierDBServiceWorker();
// Disallow copy constructor
nsUrlClassifierDBServiceWorker(nsUrlClassifierDBServiceWorker&);
// Try to open the db, DATABASE_FILENAME.
nsresult OpenDb();
// Create table in the db if they don't exist.
nsresult MaybeCreateTables(mozIStorageConnection* connection);
nsresult GetTableName(PRUint32 tableId, nsACString& table);
nsresult GetTableId(const nsACString& table, PRUint32* tableId);
// Decompress a zlib'ed chunk (used for -exp tables)
nsresult InflateChunk(nsACString& chunk);
// Expand shavar chunk into its individual entries
nsresult GetShaEntries(PRUint32 tableId,
PRUint32 chunkType,
PRUint32 chunkNum,
PRUint32 domainSize,
PRUint32 hashSize,
nsACString& chunk,
nsTArray<nsUrlClassifierEntry>& entries);
// Expand a chunk into its individual entries
nsresult GetChunkEntries(const nsACString& table,
PRUint32 tableId,
PRUint32 chunkType,
PRUint32 chunkNum,
PRUint32 hashSize,
nsACString& chunk,
nsTArray<nsUrlClassifierEntry>& entries);
// Parse one stringified range of chunks of the form "n" or "n-m" from a
// comma-separated list of chunks. Upon return, 'begin' will point to the
// next range of chunks in the list of chunks.
bool ParseChunkRange(nsACString::const_iterator &begin,
const nsACString::const_iterator &end,
PRUint32 *first, PRUint32 *last);
// Expand a stringified chunk list into an array of ints.
nsresult ParseChunkList(const nsACString& chunkStr,
nsTArray<PRUint32>& chunks);
// Join an array of ints into a stringified chunk list.
nsresult JoinChunkList(nsTArray<PRUint32>& chunks, nsCString& chunkStr);
// List the add/subtract chunks that have been applied to a table
nsresult GetChunkLists(PRUint32 tableId,
nsACString& addChunks,
nsACString& subChunks);
// Set the list of add/subtract chunks that have been applied to a table
nsresult SetChunkLists(PRUint32 tableId,
const nsACString& addChunks,
const nsACString& subChunks);
// Cache the list of add/subtract chunks applied to the table, optionally
// parsing the add or sub lists. These lists are cached while updating
// tables to avoid excessive database reads/writes and parsing.
nsresult CacheChunkLists(PRUint32 tableId,
bool parseAdds,
bool parseSubs);
// Clear the cached list of add/subtract chunks.
void ClearCachedChunkLists();
// Flush the cached add/subtract lists to the database.
nsresult FlushChunkLists();
// Inserts a chunk id into the list, sorted. Returns TRUE if the
// number was successfully added, FALSE if the chunk already exists.
bool InsertChunkId(nsTArray<PRUint32>& chunks, PRUint32 chunkNum);
// Add a list of entries to the database, merging with
// existing entries as necessary
nsresult AddChunk(PRUint32 tableId, PRUint32 chunkNum,
nsTArray<nsUrlClassifierEntry>& entries);
// Expire an add chunk
nsresult ExpireAdd(PRUint32 tableId, PRUint32 chunkNum);
// Subtract a list of entries from the database
nsresult SubChunk(PRUint32 tableId, PRUint32 chunkNum,
nsTArray<nsUrlClassifierEntry>& entries);
// Expire a subtract chunk
nsresult ExpireSub(PRUint32 tableId, PRUint32 chunkNum);
// Handle line-oriented control information from a stream update
nsresult ProcessResponseLines(bool* done);
// Handle chunk data from a stream update
nsresult ProcessChunk(bool* done);
// Sets up a transaction and begins counting update time.
nsresult SetupUpdate();
// Applies the current transaction and resets the update/working times.
nsresult ApplyUpdate();
// Reset the in-progress update stream
void ResetStream();
// Reset the in-progress update
void ResetUpdate();
// Look for a given lookup string (www.hostname.com/path/to/resource.html)
// Returns a list of entries that match.
nsresult Check(const nsCSubstring& spec,
nsTArray<nsUrlClassifierLookupResult>& results);
// Perform a classifier lookup for a given url.
nsresult DoLookup(const nsACString& spec, nsIUrlClassifierLookupCallback* c);
// Add entries to the results.
nsresult AddNoise(PRInt64 nearID,
PRInt32 count,
nsTArray<nsUrlClassifierLookupResult>& results);
// Construct a Prefix Set with known prefixes
nsresult LoadPrefixSet(nsCOMPtr<nsIFile> & aFile);
nsresult ConstructPrefixSet();
// Set the SQLite cache size
nsresult SetCacheSize(mozIStorageConnection * aConnection,
PRInt32 aCacheSize);
nsCOMPtr<nsIFile> mDBFile;
nsCOMPtr<nsIFile> mPSFile;
nsCOMPtr<nsICryptoHash> mCryptoHash;
// Holds a connection to the Db. We lazily initialize this because it has
// to be created in the background thread (currently mozStorageConnection
// isn't thread safe).
nsCOMPtr<mozIStorageConnection> mConnection;
// The main collection of entries. This is the store that will be checked
// when classifying a URL.
nsUrlClassifierAddStore mMainStore;
// The collection of subs waiting for their accompanying add.
nsUrlClassifierSubStore mPendingSubStore;
nsCOMPtr<mozIStorageStatement> mGetChunkListsStatement;
nsCOMPtr<mozIStorageStatement> mSetChunkListsStatement;
nsCOMPtr<mozIStorageStatement> mGetTablesStatement;
nsCOMPtr<mozIStorageStatement> mGetTableIdStatement;
nsCOMPtr<mozIStorageStatement> mGetTableNameStatement;
nsCOMPtr<mozIStorageStatement> mInsertTableIdStatement;
nsCOMPtr<mozIStorageStatement> mGetPageSizeStatement;
// Stores the last time a given table was updated.
nsDataHashtable<nsCStringHashKey, PRInt64> mTableFreshness;
// We receive data in small chunks that may be broken in the middle of
// a line. So we save the last partial line here.
nsCString mPendingStreamUpdate;
PRInt32 mUpdateWait;
bool mResetRequested;
bool mGrewCache;
enum {
STATE_LINE,
STATE_CHUNK
} mState;
enum {
CHUNK_ADD,
CHUNK_SUB
} mChunkType;
PRUint32 mChunkNum;
PRUint32 mHashSize;
PRUint32 mChunkLen;
// List of tables included in this update.
nsTArray<nsCString> mUpdateTables;
nsCString mUpdateTable;
PRUint32 mUpdateTableId;
nsresult mUpdateStatus;
nsCOMPtr<nsIUrlClassifierUpdateObserver> mUpdateObserver;
bool mInStream;
bool mPrimaryStream;
bool mHaveCachedLists;
PRUint32 mCachedListsTable;
nsCAutoString mCachedSubsStr;
nsCAutoString mCachedAddsStr;
bool mHaveCachedAddChunks;
nsTArray<PRUint32> mCachedAddChunks;
bool mHaveCachedSubChunks;
nsTArray<PRUint32> mCachedSubChunks;
// The client key with which the data from the server will be MAC'ed.
nsCString mUpdateClientKey;
// The MAC stated by the server.
nsCString mServerMAC;
// Start time of the current update interval. This will be reset
// every time we apply the update.
PRIntervalTime mUpdateStartTime;
nsCOMPtr<nsICryptoHMAC> mHMAC;
// The number of noise entries to add to the set of lookup results.
PRInt32 mGethashNoise;
// Set of prefixes known to be in the database
nsRefPtr<nsUrlClassifierPrefixSet> mPrefixSet;
// Pending lookups are stored in a queue for processing. The queue
// is protected by mPendingLookupLock.
Mutex mPendingLookupLock;
class PendingLookup {
public:
nsCString mKey;
nsCOMPtr<nsIUrlClassifierLookupCallback> mCallback;
};
// list of pending lookups
nsTArray<PendingLookup> mPendingLookups;
};
NS_IMPL_THREADSAFE_ISUPPORTS2(nsUrlClassifierDBServiceWorker,
nsIUrlClassifierDBServiceWorker,
nsIUrlClassifierDBService)
nsUrlClassifierDBServiceWorker::nsUrlClassifierDBServiceWorker()
: mUpdateWait(0)
, mResetRequested(false)
, mGrewCache(false)
, mState(STATE_LINE)
, mChunkType(CHUNK_ADD)
, mChunkNum(0)
, mHashSize(0)
, mChunkLen(0)
, mUpdateTableId(0)
, mUpdateStatus(NS_OK)
, mInStream(false)
, mPrimaryStream(false)
, mHaveCachedLists(false)
, mCachedListsTable(PR_UINT32_MAX)
, mHaveCachedAddChunks(false)
, mHaveCachedSubChunks(false)
, mUpdateStartTime(0)
, mGethashNoise(0)
, mPrefixSet(0)
, mPendingLookupLock("nsUrlClassifierDBServerWorker.mPendingLookupLock")
{
}
nsUrlClassifierDBServiceWorker::~nsUrlClassifierDBServiceWorker()
{
NS_ASSERTION(!mConnection,
"Db connection not closed, leaking memory! Call CloseDb "
"to close the connection.");
}
nsresult
nsUrlClassifierDBServiceWorker::Init(PRInt32 gethashNoise,
nsRefPtr<nsUrlClassifierPrefixSet> & prefSet)
{
mGethashNoise = gethashNoise;
mPrefixSet = prefSet;
// Compute database filename
// Because we dump raw integers into the database, this database isn't
// portable between machine types, so store it in the local profile dir.
nsresult rv = NS_GetSpecialDirectory(NS_APP_USER_PROFILE_LOCAL_50_DIR,
getter_AddRefs(mDBFile));
if (NS_FAILED(rv)) {
rv = NS_GetSpecialDirectory(NS_APP_USER_PROFILE_50_DIR,
getter_AddRefs(mDBFile));
}
if (NS_FAILED(rv)) return NS_ERROR_NOT_AVAILABLE;
rv = mDBFile->Clone(getter_AddRefs(mPSFile));
NS_ENSURE_SUCCESS(rv, rv);
rv = mDBFile->Append(NS_LITERAL_STRING(DATABASE_FILENAME));
NS_ENSURE_SUCCESS(rv, rv);
rv = mPSFile->Append(NS_LITERAL_STRING(PREFIXSET_FILENAME));
NS_ENSURE_SUCCESS(rv, rv);
ResetUpdate();
mTableFreshness.Init();
return NS_OK;
}
nsresult
nsUrlClassifierDBServiceWorker::QueueLookup(const nsACString& spec,
nsIUrlClassifierLookupCallback* callback)
{
MutexAutoLock lock(mPendingLookupLock);
PendingLookup* lookup = mPendingLookups.AppendElement();
if (!lookup) return NS_ERROR_OUT_OF_MEMORY;
lookup->mKey = spec;
lookup->mCallback = callback;
return NS_OK;
}
nsresult
nsUrlClassifierDBService::CheckClean(const nsACString &spec,
bool *clean)
{
Telemetry::AutoTimer<Telemetry::URLCLASSIFIER_PS_LOOKUP_TIME> timer;
// Get the set of fragments to look up.
nsTArray<nsCString> fragments;
nsresult rv = GetLookupFragments(spec, fragments);
NS_ENSURE_SUCCESS(rv, rv);
PRUint32 prefixkey;
rv = mPrefixSet->GetKey(&prefixkey);
NS_ENSURE_SUCCESS(rv, rv);
*clean = true;
for (PRUint32 i = 0; i < fragments.Length(); i++) {
nsUrlClassifierDomainHash fragmentKeyHash;
fragmentKeyHash.FromPlaintext(fragments[i], mHash);
// Find the corresponding host key
nsUrlClassifierDomainHash hostkey;
rv = GetKey(fragments[i], hostkey, mHash);
if (NS_FAILED(rv)) {
/* This happens for hosts on the local network,
can't check these against the DB */
continue;
}
PRUint32 hostprefix = hostkey.ToUint32();
PRUint32 fragkey = fragmentKeyHash.ToUint32();
PRUint32 codedkey;
rv = KeyedHash(fragkey, hostprefix, prefixkey, &codedkey);
NS_ENSURE_SUCCESS(rv, rv);
bool found = false;
bool ready = false; /* opportunistic probe */
rv = mPrefixSet->Probe(codedkey, prefixkey, &ready, &found);
NS_ENSURE_SUCCESS(rv, rv);
LOG(("CheckClean Probed %X ready: %d found: %d ",
codedkey, ready, found));
if (found || !ready) {
*clean = false;
}
}
return NS_OK;
}
static nsresult GetHostKeys(const nsACString &spec,
nsTArray<nsCString> &hostKeys)
{
nsACString::const_iterator begin, end, iter;
spec.BeginReading(begin);
spec.EndReading(end);
iter = begin;
if (!FindCharInReadable('/', iter, end)) {
return NS_OK;
}
const nsCSubstring& host = Substring(begin, iter);
if (IsCanonicalizedIP(host)) {
nsCString *key = hostKeys.AppendElement();
if (!key)
return NS_ERROR_OUT_OF_MEMORY;
key->Assign(host);
key->Append("/");
return NS_OK;
}
nsTArray<nsCString> hostComponents;
ParseString(PromiseFlatCString(host), '.', hostComponents);
if (hostComponents.Length() < 2) {
// no host or toplevel host, this won't match anything in the db
return NS_OK;
}
// First check with two domain components
PRInt32 last = PRInt32(hostComponents.Length()) - 1;
nsCString *lookupHost = hostKeys.AppendElement();
if (!lookupHost)
return NS_ERROR_OUT_OF_MEMORY;
lookupHost->Assign(hostComponents[last - 1]);
lookupHost->Append(".");
lookupHost->Append(hostComponents[last]);
lookupHost->Append("/");
// Now check with three domain components
if (hostComponents.Length() > 2) {
nsCString *lookupHost2 = hostKeys.AppendElement();
if (!lookupHost2)
return NS_ERROR_OUT_OF_MEMORY;
lookupHost2->Assign(hostComponents[last - 2]);
lookupHost2->Append(".");
lookupHost2->Append(*lookupHost);
}
return NS_OK;
}
nsresult
GetLookupFragments(const nsACString& spec,
nsTArray<nsCString>& fragments)
{
fragments.Clear();
nsACString::const_iterator begin, end, iter;
spec.BeginReading(begin);
spec.EndReading(end);
iter = begin;
if (!FindCharInReadable('/', iter, end)) {
return NS_OK;
}
const nsCSubstring& host = Substring(begin, iter++);
nsCAutoString path;
path.Assign(Substring(iter, end));
/**
* From the protocol doc:
* For the hostname, the client will try at most 5 different strings. They
* are:
* a) The exact hostname of the url
* b) The 4 hostnames formed by starting with the last 5 components and
* successivly removing the leading component. The top-level component
* can be skipped. This is not done if the hostname is a numerical IP.
*/
nsTArray<nsCString> hosts;
hosts.AppendElement(host);
if (!IsCanonicalizedIP(host)) {
host.BeginReading(begin);
host.EndReading(end);
int numHostComponents = 0;
while (RFindInReadable(NS_LITERAL_CSTRING("."), begin, end) &&
numHostComponents < MAX_HOST_COMPONENTS) {
// don't bother checking toplevel domains
if (++numHostComponents >= 2) {
host.EndReading(iter);
hosts.AppendElement(Substring(end, iter));
}
end = begin;
host.BeginReading(begin);
}
}
/**
* From the protocol doc:
* For the path, the client will also try at most 6 different strings.
* They are:
* a) the exact path of the url, including query parameters
* b) the exact path of the url, without query parameters
* c) the 4 paths formed by starting at the root (/) and
* successively appending path components, including a trailing
* slash. This behavior should only extend up to the next-to-last
* path component, that is, a trailing slash should never be
* appended that was not present in the original url.
*/
nsTArray<nsCString> paths;
nsCAutoString pathToAdd;
path.BeginReading(begin);
path.EndReading(end);
iter = begin;
if (FindCharInReadable('?', iter, end)) {
pathToAdd = Substring(begin, iter);
paths.AppendElement(pathToAdd);
end = iter;
}
int numPathComponents = 1;
iter = begin;
while (FindCharInReadable('/', iter, end) &&
numPathComponents < MAX_PATH_COMPONENTS) {
iter++;
pathToAdd.Assign(Substring(begin, iter));
paths.AppendElement(pathToAdd);
numPathComponents++;
}
// If we haven't already done so, add the full path
if (!pathToAdd.Equals(path)) {
paths.AppendElement(path);
}
// Check an empty path (for whole-domain blacklist entries)
paths.AppendElement(EmptyCString());
for (PRUint32 hostIndex = 0; hostIndex < hosts.Length(); hostIndex++) {
for (PRUint32 pathIndex = 0; pathIndex < paths.Length(); pathIndex++) {
nsCString key;
key.Assign(hosts[hostIndex]);
key.Append('/');
key.Append(paths[pathIndex]);
LOG(("Chking %s", key.get()));
fragments.AppendElement(key);
}
}
return NS_OK;
}
nsresult
nsUrlClassifierDBServiceWorker::Check(const nsACString& spec,
nsTArray<nsUrlClassifierLookupResult>& results)
{
PRInt64 now = (PR_Now() / PR_USEC_PER_SEC);
// Get list of host keys to look up
nsAutoTArray<nsCString, 2> lookupHosts;
nsresult rv = GetHostKeys(spec, lookupHosts);
nsTArray<nsUrlClassifierEntry> mCachedEntries;
// Gather host's prefixes
for (PRUint32 i = 0; i < lookupHosts.Length(); i++) {
// Find the corresponding host key
nsUrlClassifierDomainHash hostKey;
nsresult rv = GetKey(lookupHosts[i], hostKey, mCryptoHash);
NS_ENSURE_SUCCESS(rv, rv);
// Read the entries for this fragments host from SQLite
mMainStore.ReadAddEntries(hostKey, mCachedEntries);
}
// Now get the set of fragments to look up.
nsTArray<nsCString> fragments;
rv = GetLookupFragments(spec, fragments);
NS_ENSURE_SUCCESS(rv, rv);
// Now check each lookup fragment against the entries in the DB.
for (PRUint32 i = 0; i < fragments.Length(); i++) {
nsUrlClassifierCompleteHash lookupHash;
lookupHash.FromPlaintext(fragments[i], mCryptoHash);
for (PRUint32 j = 0; j < mCachedEntries.Length(); j++) {
nsUrlClassifierEntry &entry = mCachedEntries[j];
if (entry.Match(lookupHash)) {
// If the entry doesn't contain a complete hash, we need to
// save it here so that it can be compared against the
// complete hash. However, we don't set entry.mHaveComplete
// because it isn't a verified part of the entry yet.
nsUrlClassifierLookupResult *result = results.AppendElement();
if (!result)
return NS_ERROR_OUT_OF_MEMORY;
result->mLookupFragment = lookupHash;
result->mEntry = entry;
// Fill in the table name.
GetTableName(entry.mTableId, result->mTableName);
bool fresh;
PRInt64 tableUpdateTime;
if (mTableFreshness.Get(result->mTableName, &tableUpdateTime)) {
LOG(("tableUpdateTime: %lld, now: %lld, freshnessGuarantee: %d\n",
tableUpdateTime, now, gFreshnessGuarantee));
fresh = ((now - tableUpdateTime) <= gFreshnessGuarantee);
} else {
LOG(("No expiration time for this table.\n"));
fresh = false;
}
// This is a confirmed result if we match a complete fragment in
// an up-to-date table.
result->mConfirmed = entry.mHaveComplete && fresh;
LOG(("Found a result. complete=%d, fresh=%d",
entry.mHaveComplete, fresh));
}
}
}
return NS_OK;
}
/**
* Lookup up a key in the database is a two step process:
*
* a) First we look for any Entries in the database that might apply to this
* url. For each URL there are one or two possible domain names to check:
* the two-part domain name (example.com) and the three-part name
* (www.example.com). We check the database for both of these.
* b) If we find any entries, we check the list of fragments for that entry
* against the possible subfragments of the URL as described in the
* "Simplified Regular Expression Lookup" section of the protocol doc.
*/
nsresult
nsUrlClassifierDBServiceWorker::DoLookup(const nsACString& spec,
nsIUrlClassifierLookupCallback* c)
{
if (gShuttingDownThread) {
c->LookupComplete(nsnull);
return NS_ERROR_NOT_INITIALIZED;
}
nsresult rv = OpenDb();
if (NS_FAILED(rv)) {
c->LookupComplete(nsnull);
return NS_ERROR_FAILURE;
}
#if defined(PR_LOGGING)
PRIntervalTime clockStart = 0;
if (LOG_ENABLED()) {
clockStart = PR_IntervalNow();
}
#endif
nsAutoPtr<nsTArray<nsUrlClassifierLookupResult> > results;
results = new nsTArray<nsUrlClassifierLookupResult>();
if (!results) {
c->LookupComplete(nsnull);
return NS_ERROR_OUT_OF_MEMORY;
}
// we ignore failures from Check because we'd rather return the
// results that were found than fail.
Check(spec, *results);
#if defined(PR_LOGGING)
if (LOG_ENABLED()) {
PRIntervalTime clockEnd = PR_IntervalNow();
LOG(("query took %dms\n",
PR_IntervalToMilliseconds(clockEnd - clockStart)));
}
#endif
for (PRUint32 i = 0; i < results->Length(); i++) {
if (!results->ElementAt(i).mConfirmed) {
// We're going to be doing a gethash request, add some extra entries.
AddNoise(results->ElementAt(i).mEntry.mId, mGethashNoise, *results);
break;
}
}
// At this point ownership of 'results' is handed to the callback.
c->LookupComplete(results.forget());
return NS_OK;
}
nsresult
nsUrlClassifierDBServiceWorker::HandlePendingLookups()
{
MutexAutoLock lock(mPendingLookupLock);
while (mPendingLookups.Length() > 0) {
PendingLookup lookup = mPendingLookups[0];
mPendingLookups.RemoveElementAt(0);
{
MutexAutoUnlock unlock(mPendingLookupLock);
DoLookup(lookup.mKey, lookup.mCallback);
}
}
return NS_OK;
}
nsresult
nsUrlClassifierDBServiceWorker::AddNoise(PRInt64 nearID,
PRInt32 count,
nsTArray<nsUrlClassifierLookupResult>& results)
{
if (count < 1) {
return NS_OK;
}
nsCOMPtr<nsIRandomGenerator> rg =
do_GetService("@mozilla.org/security/random-generator;1");
NS_ENSURE_STATE(rg);
PRInt32 randomNum;
PRUint8 *temp;
nsresult rv = rg->GenerateRandomBytes(sizeof(randomNum), &temp);
NS_ENSURE_SUCCESS(rv, rv);
memcpy(&randomNum, temp, sizeof(randomNum));
NS_Free(temp);
PRInt32 numBefore = randomNum % count;
nsTArray<nsUrlClassifierEntry> noiseEntries;
rv = mMainStore.ReadNoiseEntries(nearID, numBefore, true, noiseEntries);
NS_ENSURE_SUCCESS(rv, rv);
rv = mMainStore.ReadNoiseEntries(nearID, count - numBefore, false, noiseEntries);
NS_ENSURE_SUCCESS(rv, rv);
for (PRUint32 i = 0; i < noiseEntries.Length(); i++) {
nsUrlClassifierLookupResult *result = results.AppendElement();
if (!result)
return NS_ERROR_OUT_OF_MEMORY;
result->mEntry = noiseEntries[i];
result->mConfirmed = false;
result->mNoise = true;
// Fill in the table name.
GetTableName(noiseEntries[i].mTableId, result->mTableName);
}
return NS_OK;
}
// Lookup a key in the db.
NS_IMETHODIMP
nsUrlClassifierDBServiceWorker::Lookup(const nsACString& spec,
nsIUrlClassifierCallback* c)
{
return HandlePendingLookups();
}
NS_IMETHODIMP
nsUrlClassifierDBServiceWorker::GetTables(nsIUrlClassifierCallback* c)
{
if (gShuttingDownThread)
return NS_ERROR_NOT_INITIALIZED;
nsresult rv = OpenDb();
if (NS_FAILED(rv)) {
NS_ERROR("Unable to open database");
return NS_ERROR_FAILURE;
}
mozStorageStatementScoper scoper(mGetTablesStatement);
nsCAutoString response;
bool hasMore;
while (NS_SUCCEEDED(rv = mGetTablesStatement->ExecuteStep(&hasMore)) &&
hasMore) {
nsCAutoString val;
mGetTablesStatement->GetUTF8String(0, val);
if (val.IsEmpty()) {
continue;
}
response.Append(val);
response.Append(';');
mGetTablesStatement->GetUTF8String(1, val);
bool haveAdds = false;
if (!val.IsEmpty()) {
response.Append("a:");
response.Append(val);
haveAdds = true;
}
mGetTablesStatement->GetUTF8String(2, val);
if (!val.IsEmpty()) {
if (haveAdds)
response.Append(":");
response.Append("s:");
response.Append(val);
}
response.Append('\n');
}
if (NS_FAILED(rv)) {
response.Truncate();
}
c->HandleEvent(response);
return rv;
}
nsresult
nsUrlClassifierDBServiceWorker::GetTableId(const nsACString& table,
PRUint32* tableId)
{
mozStorageStatementScoper findScoper(mGetTableIdStatement);
nsresult rv = mGetTableIdStatement->BindUTF8StringByIndex(0, table);
NS_ENSURE_SUCCESS(rv, rv);
bool exists;
rv = mGetTableIdStatement->ExecuteStep(&exists);
NS_ENSURE_SUCCESS(rv, rv);
if (exists) {
*tableId = mGetTableIdStatement->AsInt32(0);
return NS_OK;
}
mozStorageStatementScoper insertScoper(mInsertTableIdStatement);
rv = mInsertTableIdStatement->BindUTF8StringByIndex(0, table);
NS_ENSURE_SUCCESS(rv, rv);
rv = mInsertTableIdStatement->Execute();
NS_ENSURE_SUCCESS(rv, rv);
PRInt64 rowId;
rv = mConnection->GetLastInsertRowID(&rowId);
NS_ENSURE_SUCCESS(rv, rv);
if (rowId > PR_UINT32_MAX)
return NS_ERROR_FAILURE;
*tableId = rowId;
return NS_OK;
}
nsresult
nsUrlClassifierDBServiceWorker::GetTableName(PRUint32 tableId,
nsACString& tableName)
{
mozStorageStatementScoper findScoper(mGetTableNameStatement);
nsresult rv = mGetTableNameStatement->BindInt32ByIndex(0, tableId);
NS_ENSURE_SUCCESS(rv, rv);
bool exists;
rv = mGetTableNameStatement->ExecuteStep(&exists);
NS_ENSURE_SUCCESS(rv, rv);
if (!exists) return NS_ERROR_FAILURE;
return mGetTableNameStatement->GetUTF8String(0, tableName);
}
nsresult
nsUrlClassifierDBServiceWorker::InflateChunk(nsACString& chunk)
{
nsCAutoString inflated;
char buf[4096];
const nsPromiseFlatCString& flat = PromiseFlatCString(chunk);
z_stream stream;
memset(&stream, 0, sizeof(stream));
stream.next_in = (Bytef*)flat.get();
stream.avail_in = flat.Length();
if (inflateInit(&stream) != Z_OK) {
return NS_ERROR_FAILURE;
}
int code;
do {
stream.next_out = (Bytef*)buf;
stream.avail_out = sizeof(buf);
code = inflate(&stream, Z_NO_FLUSH);
PRUint32 numRead = sizeof(buf) - stream.avail_out;
if (code == Z_OK || code == Z_STREAM_END) {
inflated.Append(buf, numRead);
}
} while (code == Z_OK);
inflateEnd(&stream);
if (code != Z_STREAM_END) {
return NS_ERROR_FAILURE;
}
chunk = inflated;
return NS_OK;
}
nsresult
nsUrlClassifierStore::DeleteEntry(nsUrlClassifierEntry& entry)
{
if (entry.mId == -1) {
return NS_OK;
}
mozStorageStatementScoper scoper(mDeleteStatement);
mDeleteStatement->BindInt64ByIndex(0, entry.mId);
nsresult rv = mDeleteStatement->Execute();
NS_ENSURE_SUCCESS(rv, rv);
entry.mId = -1;
return NS_OK;
}
nsresult
nsUrlClassifierStore::WriteEntry(nsUrlClassifierEntry& entry)
{
if (entry.mId != -1) {
// existing entry, just ignore it
return NS_OK;
}
mozStorageStatementScoper scoper(mInsertStatement);
nsresult rv = BindStatement(entry, mInsertStatement);
NS_ENSURE_SUCCESS(rv, rv);
rv = mInsertStatement->Execute();
NS_ENSURE_SUCCESS(rv, rv);
PRInt64 rowId;
rv = mConnection->GetLastInsertRowID(&rowId);
NS_ENSURE_SUCCESS(rv, rv);
if (rowId > PR_UINT32_MAX) {
return NS_ERROR_FAILURE;
}
entry.mId = rowId;
return NS_OK;
}
nsresult
nsUrlClassifierStore::UpdateEntry(nsUrlClassifierEntry& entry)
{
mozStorageStatementScoper scoper(mUpdateStatement);
NS_ENSURE_ARG(entry.mId != -1);
nsresult rv = BindStatement(entry, mUpdateStatement);
NS_ENSURE_SUCCESS(rv, rv);
rv = mUpdateStatement->Execute();
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
static bool
IsCanonicalizedIP(const nsACString& host)
{
// The canonicalization process will have left IP addresses in dotted
// decimal with no surprises.
PRUint32 i1, i2, i3, i4;
char c;
if (PR_sscanf(PromiseFlatCString(host).get(), "%u.%u.%u.%u%c",
&i1, &i2, &i3, &i4, &c) == 4) {
return (i1 <= 0xFF && i2 <= 0xFF && i3 <= 0xFF && i4 <= 0xFF);
}
return false;
}
static nsresult
GetKey(const nsACString& spec,
nsUrlClassifierDomainHash& hash,
nsICryptoHash * aCryptoHash)
{
nsACString::const_iterator begin, end, iter;
spec.BeginReading(begin);
spec.EndReading(end);
iter = begin;
if (!FindCharInReadable('/', iter, end)) {
return NS_OK;
}
const nsCSubstring& host = Substring(begin, iter);
if (IsCanonicalizedIP(host)) {
nsCAutoString key;
key.Assign(host);
key.Append("/");
return hash.FromPlaintext(key, aCryptoHash);
}
nsTArray<nsCString> hostComponents;
ParseString(PromiseFlatCString(host), '.', hostComponents);
if (hostComponents.Length() < 2)
return NS_ERROR_FAILURE;
PRInt32 last = PRInt32(hostComponents.Length()) - 1;
nsCAutoString lookupHost;
if (hostComponents.Length() > 2) {
lookupHost.Append(hostComponents[last - 2]);
lookupHost.Append(".");
}
lookupHost.Append(hostComponents[last - 1]);
lookupHost.Append(".");
lookupHost.Append(hostComponents[last]);
lookupHost.Append("/");
return hash.FromPlaintext(lookupHost, aCryptoHash);
}
nsresult
nsUrlClassifierDBServiceWorker::GetShaEntries(PRUint32 tableId,
PRUint32 chunkType,
PRUint32 chunkNum,
PRUint32 domainSize,
PRUint32 fragmentSize,
nsACString& chunk,
nsTArray<nsUrlClassifierEntry>& entries)
{
PRUint32 start = 0;
while (start + domainSize + 1 <= chunk.Length()) {
nsUrlClassifierDomainHash domain;
domain.Assign(Substring(chunk, start, DOMAIN_LENGTH));
start += domainSize;
// then there is a one-byte count of fragments
PRUint8 numEntries = static_cast<PRUint8>(chunk[start]);
start++;
if (numEntries == 0) {
// if there are no fragments, the domain itself is treated as a
// fragment. This will only work if domainHashSize == hashSize
if (domainSize != fragmentSize) {
NS_WARNING("Received 0-fragment entry where domainSize != fragmentSize");
return NS_ERROR_FAILURE;
}
nsUrlClassifierEntry* entry = entries.AppendElement();
if (!entry) return NS_ERROR_OUT_OF_MEMORY;
entry->mKey = domain;
entry->mTableId = tableId;
entry->mChunkId = chunkNum;
entry->SetHash(domain);
if (chunkType == CHUNK_SUB) {
if (start + 4 > chunk.Length()) {
// there isn't as much data as there should be.
NS_WARNING("Received a zero-entry sub chunk without an associated add.");
return NS_ERROR_FAILURE;
}
const nsCSubstring& str = Substring(chunk, start, 4);
PRUint32 p;
memcpy(&p, str.BeginReading(), 4);
entry->mAddChunkId = PR_ntohl(p);
if (entry->mAddChunkId == 0) {
NS_WARNING("Received invalid chunk number.");
return NS_ERROR_FAILURE;
}
start += 4;
}
} else {
PRUint32 entrySize = fragmentSize;
if (chunkType == CHUNK_SUB) {
entrySize += 4;
}
if (start + (numEntries * entrySize) > chunk.Length()) {
// there isn't as much data as they said there would be.
NS_WARNING("Received a chunk without enough data");
return NS_ERROR_FAILURE;
}
for (PRUint8 i = 0; i < numEntries; i++) {
nsUrlClassifierEntry* entry = entries.AppendElement();
if (!entry) return NS_ERROR_OUT_OF_MEMORY;
entry->mKey = domain;
entry->mTableId = tableId;
entry->mChunkId = chunkNum;
if (chunkType == CHUNK_SUB) {
const nsCSubstring& str = Substring(chunk, start, 4);
PRUint32 p;
memcpy(&p, str.BeginReading(), 4);
entry->mAddChunkId = PR_ntohl(p);
if (entry->mAddChunkId == 0) {
NS_WARNING("Received invalid chunk number.");
return NS_ERROR_FAILURE;
}
start += 4;
}
if (fragmentSize == PARTIAL_LENGTH) {
nsUrlClassifierPartialHash hash;
hash.Assign(Substring(chunk, start, PARTIAL_LENGTH));
entry->SetHash(hash);
} else if (fragmentSize == COMPLETE_LENGTH) {
nsUrlClassifierCompleteHash hash;
hash.Assign(Substring(chunk, start, COMPLETE_LENGTH));
entry->SetHash(hash);
} else {
NS_ASSERTION(false, "Invalid fragment size!");
return NS_ERROR_FAILURE;
}
start += fragmentSize;
}
}
}
return NS_OK;
}
nsresult
nsUrlClassifierDBServiceWorker::GetChunkEntries(const nsACString& table,
PRUint32 tableId,
PRUint32 chunkType,
PRUint32 chunkNum,
PRUint32 hashSize,
nsACString& chunk,
nsTArray<nsUrlClassifierEntry>& entries)
{
nsresult rv;
if (StringEndsWith(table, NS_LITERAL_CSTRING("-exp"))) {
// regexp tables need to be ungzipped
rv = InflateChunk(chunk);
NS_ENSURE_SUCCESS(rv, rv);
}
if (StringEndsWith(table, NS_LITERAL_CSTRING("-shavar"))) {
rv = GetShaEntries(tableId, chunkType, chunkNum, DOMAIN_LENGTH, hashSize,
chunk, entries);
NS_ENSURE_SUCCESS(rv, rv);
} else {
nsTArray<nsCString> lines;
ParseString(PromiseFlatCString(chunk), '\n', lines);
// non-hashed tables need to be hashed
for (PRInt32 i = 0; i < PRInt32(lines.Length()); i++) {
nsUrlClassifierEntry *entry = entries.AppendElement();
if (!entry)
return NS_ERROR_OUT_OF_MEMORY;
nsCAutoString entryStr;
if (chunkType == CHUNK_SUB) {
nsCString::const_iterator begin, iter, end;
lines[i].BeginReading(begin);
lines[i].EndReading(end);
iter = begin;
if (!FindCharInReadable(':', iter, end) ||
PR_sscanf(lines[i].get(), "%d:", &entry->mAddChunkId) != 1) {
NS_WARNING("Received sub chunk without associated add chunk.");
return NS_ERROR_FAILURE;
}
iter++;
entryStr = Substring(iter, end);
} else {
entryStr = lines[i];
}
rv = GetKey(entryStr, entry->mKey, mCryptoHash);
NS_ENSURE_SUCCESS(rv, rv);
entry->mTableId = tableId;
entry->mChunkId = chunkNum;
if (hashSize == PARTIAL_LENGTH) {
nsUrlClassifierPartialHash hash;
hash.FromPlaintext(entryStr, mCryptoHash);
entry->SetHash(hash);
} else if (hashSize == COMPLETE_LENGTH) {
nsUrlClassifierCompleteHash hash;
hash.FromPlaintext(entryStr, mCryptoHash);
entry->SetHash(hash);
} else {
NS_ASSERTION(false, "Invalid fragment size!");
return NS_ERROR_FAILURE;
}
}
}
return NS_OK;
}
bool
nsUrlClassifierDBServiceWorker::ParseChunkRange(nsACString::const_iterator &begin,
const nsACString::const_iterator &end,
PRUint32 *first,
PRUint32 *last)
{
nsACString::const_iterator iter = begin;
FindCharInReadable(',', iter, end);
nsCAutoString element(Substring(begin, iter));
begin = iter;
if (begin != end)
begin++;
PRUint32 numRead = PR_sscanf(element.get(), "%u-%u", first, last);
if (numRead == 2) {
if (*first > *last) {
PRUint32 tmp = *first;
*first = *last;
*last = tmp;
}
return true;
}
if (numRead == 1) {
*last = *first;
return true;
}
return false;
}
nsresult
nsUrlClassifierDBServiceWorker::ParseChunkList(const nsACString& chunkStr,
nsTArray<PRUint32>& chunks)
{
LOG(("Parsing %s", PromiseFlatCString(chunkStr).get()));
nsACString::const_iterator begin, end;
chunkStr.BeginReading(begin);
chunkStr.EndReading(end);
while (begin != end) {
PRUint32 first, last;
if (ParseChunkRange(begin, end, &first, &last)) {
for (PRUint32 num = first; num <= last; num++) {
chunks.AppendElement(num);
}
}
}
LOG(("Got %d elements.", chunks.Length()));
return NS_OK;
}
nsresult
nsUrlClassifierDBServiceWorker::JoinChunkList(nsTArray<PRUint32>& chunks,
nsCString& chunkStr)
{
chunkStr.Truncate();
chunks.Sort();
PRUint32 i = 0;
while (i < chunks.Length()) {
if (i != 0) {
chunkStr.Append(',');
}
chunkStr.AppendInt(chunks[i]);
PRUint32 first = i;
PRUint32 last = first;
i++;
while (i < chunks.Length() && (chunks[i] == chunks[i - 1] + 1 || chunks[i] == chunks[i - 1])) {
last = i++;
}
if (last != first) {
chunkStr.Append('-');
chunkStr.AppendInt(chunks[last]);
}
}
return NS_OK;
}
nsresult
nsUrlClassifierDBServiceWorker::GetChunkLists(PRUint32 tableId,
nsACString& addChunks,
nsACString& subChunks)
{
addChunks.Truncate();
subChunks.Truncate();
mozStorageStatementScoper scoper(mGetChunkListsStatement);
nsresult rv = mGetChunkListsStatement->BindInt32ByIndex(0, tableId);
NS_ENSURE_SUCCESS(rv, rv);
bool hasMore = false;
rv = mGetChunkListsStatement->ExecuteStep(&hasMore);
NS_ENSURE_SUCCESS(rv, rv);
if (!hasMore) {
LOG(("Getting chunks for %d, found nothing", tableId));
return NS_OK;
}
rv = mGetChunkListsStatement->GetUTF8String(0, addChunks);
NS_ENSURE_SUCCESS(rv, rv);
rv = mGetChunkListsStatement->GetUTF8String(1, subChunks);
NS_ENSURE_SUCCESS(rv, rv);
LOG(("Getting chunks for %d, got %s/%s",
tableId,
PromiseFlatCString(addChunks).get(),
PromiseFlatCString(subChunks).get()));
return NS_OK;
}
nsresult
nsUrlClassifierDBServiceWorker::SetChunkLists(PRUint32 tableId,
const nsACString& addChunks,
const nsACString& subChunks)
{
mozStorageStatementScoper scoper(mSetChunkListsStatement);
mSetChunkListsStatement->BindUTF8StringByIndex(0, addChunks);
mSetChunkListsStatement->BindUTF8StringByIndex(1, subChunks);
mSetChunkListsStatement->BindInt32ByIndex(2, tableId);
nsresult rv = mSetChunkListsStatement->Execute();
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
nsresult
nsUrlClassifierDBServiceWorker::CacheChunkLists(PRUint32 tableId,
bool parseAdds,
bool parseSubs)
{
nsresult rv;
if (mHaveCachedLists && mCachedListsTable != tableId) {
rv = FlushChunkLists();
NS_ENSURE_SUCCESS(rv, rv);
}
if (!mHaveCachedLists) {
rv = GetChunkLists(tableId, mCachedAddsStr, mCachedSubsStr);
NS_ENSURE_SUCCESS(rv, rv);
mHaveCachedLists = true;
mCachedListsTable = tableId;
}
if (parseAdds && !mHaveCachedAddChunks) {
ParseChunkList(mCachedAddsStr, mCachedAddChunks);
mHaveCachedAddChunks = true;
}
if (parseSubs && !mHaveCachedSubChunks) {
ParseChunkList(mCachedSubsStr, mCachedSubChunks);
mHaveCachedSubChunks = true;
}
return NS_OK;
}
nsresult
nsUrlClassifierDBServiceWorker::FlushChunkLists()
{
if (!mHaveCachedLists) {
return NS_OK;
}
if (mHaveCachedAddChunks) {
JoinChunkList(mCachedAddChunks, mCachedAddsStr);
}
if (mHaveCachedSubChunks) {
JoinChunkList(mCachedSubChunks, mCachedSubsStr);
}
nsresult rv = SetChunkLists(mCachedListsTable,
mCachedAddsStr, mCachedSubsStr);
// clear out the cache before checking/returning the error here.
ClearCachedChunkLists();
return rv;
}
void
nsUrlClassifierDBServiceWorker::ClearCachedChunkLists()
{
mCachedAddsStr.Truncate();
mCachedSubsStr.Truncate();
mCachedListsTable = PR_UINT32_MAX;
mHaveCachedLists = false;
mCachedAddChunks.Clear();
mHaveCachedAddChunks = false;
mCachedSubChunks.Clear();
mHaveCachedSubChunks = false;
}
bool
nsUrlClassifierDBServiceWorker::InsertChunkId(nsTArray<PRUint32> &chunks,
PRUint32 chunkNum)
{
PRUint32 low = 0, high = chunks.Length();
while (high > low) {
PRUint32 mid = (high + low) >> 1;
if (chunks[mid] == chunkNum)
return false;
if (chunks[mid] < chunkNum)
low = mid + 1;
else
high = mid;
}
PRUint32 *item = chunks.InsertElementAt(low, chunkNum);
return (item != nsnull);
}
nsresult
nsUrlClassifierDBServiceWorker::AddChunk(PRUint32 tableId,
PRUint32 chunkNum,
nsTArray<nsUrlClassifierEntry>& entries)
{
#if defined(PR_LOGGING)
PRIntervalTime clockStart = 0;
if (LOG_ENABLED()) {
clockStart = PR_IntervalNow();
}
#endif
nsresult rv = CacheChunkLists(tableId, true, false);
NS_ENSURE_SUCCESS(rv, rv);
if (!InsertChunkId(mCachedAddChunks, chunkNum)) {
LOG(("Ignoring duplicate add chunk %d in table %d", chunkNum, tableId));
return NS_OK;
}
LOG(("Adding %d entries to chunk %d in table %d", entries.Length(), chunkNum, tableId));
nsTArray<PRUint32> entryIDs;
nsAutoTArray<nsUrlClassifierEntry, 5> subEntries;
rv = mPendingSubStore.ReadSubEntries(tableId, chunkNum, subEntries);
NS_ENSURE_SUCCESS(rv, rv);
for (PRUint32 i = 0; i < entries.Length(); i++) {
nsUrlClassifierEntry& thisEntry = entries[i];
HandlePendingLookups();
bool writeEntry = true;
for (PRUint32 j = 0; j < subEntries.Length(); j++) {
if (thisEntry.SubMatch(subEntries[j])) {
subEntries.RemoveElementAt(j);
writeEntry = false;
break;
}
}
HandlePendingLookups();
if (writeEntry) {
rv = mMainStore.WriteEntry(thisEntry);
NS_ENSURE_SUCCESS(rv, rv);
}
}
rv = mPendingSubStore.ExpireAddChunk(tableId, chunkNum);
NS_ENSURE_SUCCESS(rv, rv);
#if defined(PR_LOGGING)
if (LOG_ENABLED()) {
PRIntervalTime clockEnd = PR_IntervalNow();
LOG(("adding chunk %d took %dms\n", chunkNum,
PR_IntervalToMilliseconds(clockEnd - clockStart)));
}
#endif
return rv;
}
nsresult
nsUrlClassifierStore::Expire(PRUint32 tableId, PRUint32 chunkNum)
{
LOG(("Expiring chunk %d\n", chunkNum));
mozStorageStatementScoper expireScoper(mExpireStatement);
nsresult rv = mExpireStatement->BindInt32ByIndex(0, tableId);
NS_ENSURE_SUCCESS(rv, rv);
rv = mExpireStatement->BindInt32ByIndex(1, chunkNum);
NS_ENSURE_SUCCESS(rv, rv);
mWorker->HandlePendingLookups();
rv = mExpireStatement->Execute();
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
nsresult
nsUrlClassifierDBServiceWorker::ExpireAdd(PRUint32 tableId,
PRUint32 chunkNum)
{
nsresult rv = CacheChunkLists(tableId, true, false);
NS_ENSURE_SUCCESS(rv, rv);
mCachedAddChunks.RemoveElement(chunkNum);
return mMainStore.Expire(tableId, chunkNum);
}
nsresult
nsUrlClassifierDBServiceWorker::SubChunk(PRUint32 tableId,
PRUint32 chunkNum,
nsTArray<nsUrlClassifierEntry>& entries)
{
nsresult rv = CacheChunkLists(tableId, true, true);
if (!InsertChunkId(mCachedSubChunks, chunkNum)) {
LOG(("Ignoring duplicate sub chunk %d in table %d", chunkNum, tableId));
return NS_OK;
}
LOG(("Subbing %d entries in chunk %d in table %d", entries.Length(), chunkNum, tableId));
for (PRUint32 i = 0; i < entries.Length(); i++) {
nsAutoTArray<nsUrlClassifierEntry, 5> existingEntries;
nsUrlClassifierEntry& thisEntry = entries[i];
HandlePendingLookups();
// Check if we have the add chunk associated with the sub.
bool haveAdds = (mCachedAddChunks.BinaryIndexOf(thisEntry.mAddChunkId) !=
mCachedAddChunks.NoIndex);
if (haveAdds) {
rv = mMainStore.ReadAddEntries(thisEntry.mKey, thisEntry.mTableId,
thisEntry.mAddChunkId, existingEntries);
NS_ENSURE_SUCCESS(rv, rv);
}
for (PRUint32 j = 0; j < existingEntries.Length(); j++) {
if (existingEntries[j].SubMatch(thisEntry)) {
rv = mMainStore.DeleteEntry(existingEntries[j]);
NS_ENSURE_SUCCESS(rv, rv);
existingEntries.RemoveElementAt(j);
break;
}
}
if (!haveAdds) {
// Save this entry in the pending subtraction store.
rv = mPendingSubStore.WriteEntry(thisEntry);
NS_ENSURE_SUCCESS(rv, rv);
}
}
return NS_OK;
}
nsresult
nsUrlClassifierDBServiceWorker::ExpireSub(PRUint32 tableId, PRUint32 chunkNum)
{
nsresult rv = CacheChunkLists(tableId, false, true);
NS_ENSURE_SUCCESS(rv, rv);
mCachedSubChunks.RemoveElement(chunkNum);
return mPendingSubStore.Expire(tableId, chunkNum);
}
nsresult
nsUrlClassifierDBServiceWorker::ProcessChunk(bool* done)
{
// wait until the chunk has been read
if (mPendingStreamUpdate.Length() < static_cast<PRUint32>(mChunkLen)) {
*done = true;
return NS_OK;
}
nsCAutoString chunk;
chunk.Assign(Substring(mPendingStreamUpdate, 0, mChunkLen));
mPendingStreamUpdate = Substring(mPendingStreamUpdate, mChunkLen);
LOG(("Handling a chunk sized %d", chunk.Length()));
nsTArray<nsUrlClassifierEntry> entries;
nsresult rv = GetChunkEntries(mUpdateTable, mUpdateTableId, mChunkType,
mChunkNum, mHashSize, chunk, entries);
NS_ENSURE_SUCCESS(rv, rv);
if (mChunkType == CHUNK_ADD) {
rv = AddChunk(mUpdateTableId, mChunkNum, entries);
} else {
rv = SubChunk(mUpdateTableId, mChunkNum, entries);
}
mState = STATE_LINE;
*done = false;
return rv;
}
nsresult
nsUrlClassifierDBServiceWorker::ProcessResponseLines(bool* done)
{
PRUint32 cur = 0;
PRInt32 next;
nsresult rv;
// We will run to completion unless we find a chunk line
*done = true;
nsACString& updateString = mPendingStreamUpdate;
while(cur < updateString.Length() &&
(next = updateString.FindChar('\n', cur)) != kNotFound) {
const nsCSubstring& line = Substring(updateString, cur, next - cur);
cur = next + 1;
LOG(("Processing %s\n", PromiseFlatCString(line).get()));
if (mHMAC && mServerMAC.IsEmpty()) {
// If we did not receive a server MAC during BeginStream(), we
// require the first line of the update to be either a MAC or
// a request to rekey.
if (StringBeginsWith(line, NS_LITERAL_CSTRING("m:"))) {
mServerMAC = Substring(line, 2);
nsUrlClassifierUtils::UnUrlsafeBase64(mServerMAC);
// The remainder of the pending update needs to be digested.
const nsCSubstring &toDigest = Substring(updateString, cur);
rv = mHMAC->Update(reinterpret_cast<const PRUint8*>(toDigest.BeginReading()),
toDigest.Length());
NS_ENSURE_SUCCESS(rv, rv);
} else if (line.EqualsLiteral("e:pleaserekey")) {
mUpdateObserver->RekeyRequested();
} else {
LOG(("No MAC specified!"));
return NS_ERROR_FAILURE;
}
} else if (StringBeginsWith(line, NS_LITERAL_CSTRING("n:"))) {
if (PR_sscanf(PromiseFlatCString(line).get(), "n:%d",
&mUpdateWait) != 1) {
LOG(("Error parsing n: field: %s", PromiseFlatCString(line).get()));
mUpdateWait = 0;
}
} else if (line.EqualsLiteral("r:pleasereset")) {
mResetRequested = true;
} else if (line.EqualsLiteral("e:pleaserekey")) {
mUpdateObserver->RekeyRequested();
} else if (StringBeginsWith(line, NS_LITERAL_CSTRING("i:"))) {
mUpdateTable.Assign(Substring(line, 2));
GetTableId(mUpdateTable, &mUpdateTableId);
LOG(("update table: '%s' (%d)", mUpdateTable.get(), mUpdateTableId));
} else if (StringBeginsWith(line, NS_LITERAL_CSTRING("u:"))) {
if (!mPrimaryStream) {
LOG(("Forwarded update tried to add its own forwarded update."));
return NS_ERROR_FAILURE;
}
const nsCSubstring& data = Substring(line, 2);
if (mHMAC) {
// We're expecting MACs alongside any url forwards.
nsCSubstring::const_iterator begin, end, sepBegin, sepEnd;
data.BeginReading(begin);
sepBegin = begin;
data.EndReading(end);
sepEnd = end;
if (!RFindInReadable(NS_LITERAL_CSTRING(","), sepBegin, sepEnd)) {
NS_WARNING("No MAC specified for a redirect in a request that expects a MAC");
return NS_ERROR_FAILURE;
}
nsCString serverMAC(Substring(sepEnd, end));
nsUrlClassifierUtils::UnUrlsafeBase64(serverMAC);
mUpdateObserver->UpdateUrlRequested(Substring(begin, sepBegin),
mUpdateTable,
serverMAC);
} else {
// We didn't ask for a MAC, none should have been specified.
mUpdateObserver->UpdateUrlRequested(data, mUpdateTable,
NS_LITERAL_CSTRING(""));
}
} else if (StringBeginsWith(line, NS_LITERAL_CSTRING("a:")) ||
StringBeginsWith(line, NS_LITERAL_CSTRING("s:"))) {
mState = STATE_CHUNK;
char command;
if (PR_sscanf(PromiseFlatCString(line).get(),
"%c:%d:%d:%d", &command, &mChunkNum, &mHashSize, &mChunkLen) != 4) {
return NS_ERROR_FAILURE;
}
if (mChunkLen > MAX_CHUNK_SIZE) {
return NS_ERROR_FAILURE;
}
if (!(mHashSize == PARTIAL_LENGTH || mHashSize == COMPLETE_LENGTH)) {
NS_WARNING("Invalid hash size specified in update.");
return NS_ERROR_FAILURE;
}
mChunkType = (command == 'a') ? CHUNK_ADD : CHUNK_SUB;
// Done parsing lines, move to chunk state now
*done = false;
break;
} else if (StringBeginsWith(line, NS_LITERAL_CSTRING("ad:"))) {
const nsCSubstring &list = Substring(line, 3);
nsACString::const_iterator begin, end;
list.BeginReading(begin);
list.EndReading(end);
while (begin != end) {
PRUint32 first, last;
if (ParseChunkRange(begin, end, &first, &last)) {
for (PRUint32 num = first; num <= last; num++) {
rv = ExpireAdd(mUpdateTableId, num);
NS_ENSURE_SUCCESS(rv, rv);
}
} else {
return NS_ERROR_FAILURE;
}
}
} else if (StringBeginsWith(line, NS_LITERAL_CSTRING("sd:"))) {
const nsCSubstring &list = Substring(line, 3);
nsACString::const_iterator begin, end;
list.BeginReading(begin);
list.EndReading(end);
while (begin != end) {
PRUint32 first, last;
if (ParseChunkRange(begin, end, &first, &last)) {
for (PRUint32 num = first; num <= last; num++) {
rv = ExpireSub(mUpdateTableId, num);
NS_ENSURE_SUCCESS(rv, rv);
}
} else {
return NS_ERROR_FAILURE;
}
}
} else {
LOG(("ignoring unknown line: '%s'", PromiseFlatCString(line).get()));
}
}
mPendingStreamUpdate = Substring(updateString, cur);
return NS_OK;
}
void
nsUrlClassifierDBServiceWorker::ResetStream()
{
mState = STATE_LINE;
mChunkNum = 0;
mHashSize = 0;
mChunkLen = 0;
mInStream = false;
mPrimaryStream = false;
mUpdateTable.Truncate();
mPendingStreamUpdate.Truncate();
mServerMAC.Truncate();
mHMAC = nsnull;
}
void
nsUrlClassifierDBServiceWorker::ResetUpdate()
{
mUpdateWait = 0;
mUpdateStatus = NS_OK;
mUpdateObserver = nsnull;
mUpdateClientKey.Truncate();
mResetRequested = false;
mUpdateTables.Clear();
}
NS_IMETHODIMP
nsUrlClassifierDBServiceWorker::SetHashCompleter(const nsACString &tableName,
nsIUrlClassifierHashCompleter *completer)
{
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP
nsUrlClassifierDBServiceWorker::BeginUpdate(nsIUrlClassifierUpdateObserver *observer,
const nsACString &tables,
const nsACString &clientKey)
{
if (gShuttingDownThread)
return NS_ERROR_NOT_INITIALIZED;
NS_ENSURE_STATE(!mUpdateObserver);
nsresult rv = OpenDb();
if (NS_FAILED(rv)) {
NS_ERROR("Unable to open database");
return NS_ERROR_FAILURE;
}
bool transaction;
rv = mConnection->GetTransactionInProgress(&transaction);
if (NS_FAILED(rv)) {
mUpdateStatus = rv;
return rv;
}
if (transaction) {
NS_WARNING("Transaction already in progress in nsUrlClassifierDBServiceWorker::BeginUpdate. Cancelling update.");
mUpdateStatus = NS_ERROR_FAILURE;
return rv;
}
rv = SetupUpdate();
if (NS_FAILED(rv)) {
mUpdateStatus = rv;
return rv;
}
mUpdateObserver = observer;
if (!clientKey.IsEmpty()) {
rv = nsUrlClassifierUtils::DecodeClientKey(clientKey, mUpdateClientKey);
NS_ENSURE_SUCCESS(rv, rv);
}
// The first stream in an update is the only stream that may request
// forwarded updates.
mPrimaryStream = true;
SplitTables(tables, mUpdateTables);
return NS_OK;
}
NS_IMETHODIMP
nsUrlClassifierDBServiceWorker::BeginStream(const nsACString &table,
const nsACString &serverMAC)
{
if (gShuttingDownThread)
return NS_ERROR_NOT_INITIALIZED;
NS_ENSURE_STATE(mUpdateObserver);
NS_ENSURE_STATE(!mInStream);
// We may have committed the update in FinishStream, if so set it up
// again here.
nsresult rv = SetupUpdate();
if (NS_FAILED(rv)) {
mUpdateStatus = rv;
return rv;
}
mInStream = true;
// If we're expecting a MAC, create the nsICryptoHMAC component now.
if (!mUpdateClientKey.IsEmpty()) {
nsCOMPtr<nsIKeyObjectFactory> keyObjectFactory(do_GetService(
"@mozilla.org/security/keyobjectfactory;1", &rv));
if (NS_FAILED(rv)) {
NS_WARNING("Failed to get nsIKeyObjectFactory service");
mUpdateStatus = rv;
return mUpdateStatus;
}
nsCOMPtr<nsIKeyObject> keyObject;
rv = keyObjectFactory->KeyFromString(nsIKeyObject::HMAC, mUpdateClientKey,
getter_AddRefs(keyObject));
if (NS_FAILED(rv)) {
NS_WARNING("Failed to create key object, maybe not FIPS compliant?");
mUpdateStatus = rv;
return mUpdateStatus;
}
mHMAC = do_CreateInstance(NS_CRYPTO_HMAC_CONTRACTID, &rv);
if (NS_FAILED(rv)) {
NS_WARNING("Failed to create nsICryptoHMAC instance");
mUpdateStatus = rv;
return mUpdateStatus;
}
rv = mHMAC->Init(nsICryptoHMAC::SHA1, keyObject);
if (NS_FAILED(rv)) {
NS_WARNING("Failed to initialize nsICryptoHMAC instance");
mUpdateStatus = rv;
return mUpdateStatus;
}
}
mServerMAC = serverMAC;
if (!table.IsEmpty()) {
mUpdateTable = table;
GetTableId(mUpdateTable, &mUpdateTableId);
LOG(("update table: '%s' (%d)", mUpdateTable.get(), mUpdateTableId));
}
return NS_OK;
}
/**
* Updating the database:
*
* The Update() method takes a series of chunks separated with control data,
* as described in
* http://code.google.com/p/google-safe-browsing/wiki/Protocolv2Spec
*
* It will iterate through the control data until it reaches a chunk. By
* the time it reaches a chunk, it should have received
* a) the table to which this chunk applies
* b) the type of chunk (add, delete, expire add, expire delete).
* c) the chunk ID
* d) the length of the chunk.
*
* For add and subtract chunks, it needs to read the chunk data (expires
* don't have any data). Chunk data is a list of URI fragments whose
* encoding depends on the type of table (which is indicated by the end
* of the table name):
* a) tables ending with -exp are a zlib-compressed list of URI fragments
* separated by newlines.
* b) tables ending with -sha128 have the form
* [domain][N][frag0]...[fragN]
* 16 1 16 16
* If N is 0, the domain is reused as a fragment.
* c) any other tables are assumed to be a plaintext list of URI fragments
* separated by newlines.
*
* Update() can be fed partial data; It will accumulate data until there is
* enough to act on. Finish() should be called when there will be no more
* data.
*/
NS_IMETHODIMP
nsUrlClassifierDBServiceWorker::UpdateStream(const nsACString& chunk)
{
if (gShuttingDownThread)
return NS_ERROR_NOT_INITIALIZED;
NS_ENSURE_STATE(mInStream);
HandlePendingLookups();
LOG(("Update from Stream."));
nsresult rv = OpenDb();
if (NS_FAILED(rv)) {
NS_ERROR("Unable to open database");
return NS_ERROR_FAILURE;
}
// if something has gone wrong during this update, just throw it away
if (NS_FAILED(mUpdateStatus)) {
return mUpdateStatus;
}
if (mHMAC && !mServerMAC.IsEmpty()) {
rv = mHMAC->Update(reinterpret_cast<const PRUint8*>(chunk.BeginReading()),
chunk.Length());
if (NS_FAILED(rv)) {
mUpdateStatus = rv;
return mUpdateStatus;
}
}
LOG(("Got %s\n", PromiseFlatCString(chunk).get()));
mPendingStreamUpdate.Append(chunk);
bool done = false;
while (!done) {
if (mState == STATE_CHUNK) {
rv = ProcessChunk(&done);
} else {
rv = ProcessResponseLines(&done);
}
if (NS_FAILED(rv)) {
mUpdateStatus = rv;
return rv;
}
}
return NS_OK;
}
NS_IMETHODIMP
nsUrlClassifierDBServiceWorker::FinishStream()
{
if (gShuttingDownThread)
return NS_ERROR_NOT_INITIALIZED;
NS_ENSURE_STATE(mInStream);
NS_ENSURE_STATE(mUpdateObserver);
PRInt32 nextStreamDelay = 0;
if (NS_SUCCEEDED(mUpdateStatus) && mHMAC) {
nsCAutoString clientMAC;
mHMAC->Finish(true, clientMAC);
if (clientMAC != mServerMAC) {
NS_WARNING("Invalid update MAC!");
LOG(("Invalid update MAC: expected %s, got %s",
mServerMAC.get(), clientMAC.get()));
mUpdateStatus = NS_ERROR_FAILURE;
}
PRIntervalTime updateTime = PR_IntervalNow() - mUpdateStartTime;
if (PR_IntervalToSeconds(updateTime) >=
static_cast<PRUint32>(gWorkingTimeThreshold)) {
// We've spent long enough working that we should commit what we
// have and hold off for a bit.
ApplyUpdate();
nextStreamDelay = gDelayTime * 1000;
}
}
mUpdateObserver->StreamFinished(mUpdateStatus,
static_cast<PRUint32>(nextStreamDelay));
ResetStream();
return NS_OK;
}
nsresult
nsUrlClassifierDBServiceWorker::SetCacheSize(
mozIStorageConnection * aConnection, PRInt32 aCacheSize)
{
mozStorageStatementScoper scoper(mGetPageSizeStatement);
bool hasResult;
nsresult rv = mGetPageSizeStatement->ExecuteStep(&hasResult);
NS_ENSURE_SUCCESS(rv, rv);
NS_ASSERTION(hasResult, "Should always be able to get page size from sqlite");
PRUint32 pageSize = mGetPageSizeStatement->AsInt32(0);
PRUint32 cachePages = aCacheSize / pageSize;
nsCAutoString cacheSizePragma("PRAGMA cache_size=");
cacheSizePragma.AppendInt(cachePages);
rv = aConnection->ExecuteSimpleSQL(cacheSizePragma);
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
nsresult
nsUrlClassifierDBServiceWorker::SetupUpdate()
{
LOG(("nsUrlClassifierDBServiceWorker::SetupUpdate"));
bool inProgress;
nsresult rv = mConnection->GetTransactionInProgress(&inProgress);
if (inProgress) {
return NS_OK;
}
mUpdateStartTime = PR_IntervalNow();
rv = mConnection->BeginTransaction();
NS_ENSURE_SUCCESS(rv, rv);
if (gUpdateCacheSize > 0) {
rv = SetCacheSize(mConnection, gUpdateCacheSize);
NS_ENSURE_SUCCESS(rv, rv);
if (gUpdateCacheSize != gLookupCacheSize) {
mGrewCache = true;
}
}
return NS_OK;
}
nsresult
nsUrlClassifierDBServiceWorker::ApplyUpdate()
{
LOG(("nsUrlClassifierDBServiceWorker::ApplyUpdate"));
if (mConnection) {
if (NS_FAILED(mUpdateStatus)) {
mConnection->RollbackTransaction();
} else {
mUpdateStatus = FlushChunkLists();
if (NS_SUCCEEDED(mUpdateStatus)) {
mUpdateStatus = mConnection->CommitTransaction();
}
}
}
if (NS_SUCCEEDED(mUpdateStatus)) {
// Reconstruct the prefix tree from the DB
nsresult rv = ConstructPrefixSet();
NS_ENSURE_SUCCESS(rv, rv);
}
if (mGrewCache) {
// During the update we increased the page cache to bigger than we
// want to keep around. At the moment, the only reliable way to make
// sure that the page cache is freed is to reopen the connection.
LOG(("GrewCache true, reopening DB"));
mGrewCache = false;
CloseDb();
OpenDb();
}
mUpdateStartTime = 0;
return NS_OK;
}
NS_IMETHODIMP
nsUrlClassifierDBServiceWorker::FinishUpdate()
{
LOG(("nsUrlClassifierDBServiceWorker::FinishUpdate()"));
if (gShuttingDownThread)
return NS_ERROR_NOT_INITIALIZED;
NS_ENSURE_STATE(!mInStream);
NS_ENSURE_STATE(mUpdateObserver);
// We need to get the error code before ApplyUpdate, because it might
// close/open the connection.
PRInt32 errcode = SQLITE_OK;
if (mConnection)
mConnection->GetLastError(&errcode);
ApplyUpdate();
if (NS_SUCCEEDED(mUpdateStatus)) {
mUpdateObserver->UpdateSuccess(mUpdateWait);
} else {
mUpdateObserver->UpdateError(mUpdateStatus);
}
// It's important that we only reset the database on an update
// command if the update was successful, otherwise unauthenticated
// updates could cause a database reset.
bool resetDB = (NS_SUCCEEDED(mUpdateStatus) && mResetRequested) ||
errcode == SQLITE_CORRUPT;
if (!resetDB) {
if (NS_SUCCEEDED(mUpdateStatus)) {
PRInt64 now = (PR_Now() / PR_USEC_PER_SEC);
for (PRUint32 i = 0; i < mUpdateTables.Length(); i++) {
LOG(("Successfully updated %s", mUpdateTables[i].get()));
mTableFreshness.Put(mUpdateTables[i], now);
}
} else {
for (PRUint32 i = 0; i < mUpdateTables.Length(); i++) {
LOG(("Failed updating %s", mUpdateTables[i].get()));
mTableFreshness.Remove(mUpdateTables[i]);
}
}
}
ResetUpdate();
if (resetDB) {
ResetDatabase();
}
return NS_OK;
}
NS_IMETHODIMP
nsUrlClassifierDBServiceWorker::ResetDatabase()
{
LOG(("nsUrlClassifierDBServiceWorker::ResetDatabase [%p]", this));
ClearCachedChunkLists();
mTableFreshness.Clear();
nsresult rv = CloseDb();
NS_ENSURE_SUCCESS(rv, rv);
rv = mPrefixSet->SetPrefixes(nsnull, 0);
NS_ENSURE_SUCCESS(rv, rv);
mDBFile->Remove(false);
mPSFile->Remove(false);
return NS_OK;
}
NS_IMETHODIMP
nsUrlClassifierDBServiceWorker::CancelUpdate()
{
LOG(("CancelUpdate"));
if (mUpdateObserver) {
mUpdateStatus = NS_BINDING_ABORTED;
ClearCachedChunkLists();
mConnection->RollbackTransaction();
mUpdateObserver->UpdateError(mUpdateStatus);
for (PRUint32 i = 0; i < mUpdateTables.Length(); i++) {
LOG(("Failed updating %s", mUpdateTables[i].get()));
mTableFreshness.Remove(mUpdateTables[i]);
}
ResetStream();
ResetUpdate();
}
return NS_OK;
}
// Allows the main thread to delete the connection which may be in
// a background thread.
// XXX This could be turned into a single shutdown event so the logic
// is simpler in nsUrlClassifierDBService::Shutdown.
NS_IMETHODIMP
nsUrlClassifierDBServiceWorker::CloseDb()
{
if (mConnection) {
mMainStore.Close();
mPendingSubStore.Close();
mGetChunkListsStatement = nsnull;
mSetChunkListsStatement = nsnull;
mGetTablesStatement = nsnull;
mGetTableIdStatement = nsnull;
mGetTableNameStatement = nsnull;
mInsertTableIdStatement = nsnull;
mGetPageSizeStatement = nsnull;
mConnection = nsnull;
LOG(("urlclassifier db closed\n"));
}
mCryptoHash = nsnull;
return NS_OK;
}
NS_IMETHODIMP
nsUrlClassifierDBServiceWorker::CacheCompletions(nsTArray<nsUrlClassifierLookupResult> *results)
{
LOG(("nsUrlClassifierDBServiceWorker::CacheCompletions [%p]", this));
nsAutoPtr<nsTArray<nsUrlClassifierLookupResult> > resultsPtr(results);
// Start a new transaction. If a transaction is open for an update
// this will be a noop, and this cache will be included in the
// update's transaction.
mozStorageTransaction trans(mConnection, true);
for (PRUint32 i = 0; i < results->Length(); i++) {
nsUrlClassifierLookupResult& result = results->ElementAt(i);
// Failing to update here shouldn't be fatal (and might be common,
// if we're updating entries that were removed since they were
// returned after a lookup).
mMainStore.UpdateEntry(result.mEntry);
}
return NS_OK;
}
nsresult
nsUrlClassifierDBServiceWorker::OpenDb()
{
// Connection already open, don't do anything.
if (mConnection) {
return NS_OK;
}
LOG(("Opening db\n"));
nsresult rv;
// open the connection
nsCOMPtr<mozIStorageService> storageService =
do_GetService(MOZ_STORAGE_SERVICE_CONTRACTID, &rv);
NS_ENSURE_SUCCESS(rv, rv);
bool exists;
rv = mDBFile->Exists(&exists);
NS_ENSURE_SUCCESS(rv, rv);
bool newDB = !exists;
nsCOMPtr<mozIStorageConnection> connection;
rv = storageService->OpenDatabase(mDBFile, getter_AddRefs(connection));
if (rv == NS_ERROR_FILE_CORRUPTED) {
// delete the db and try opening again
rv = mDBFile->Remove(false);
NS_ENSURE_SUCCESS(rv, rv);
newDB = true;
rv = storageService->OpenDatabase(mDBFile, getter_AddRefs(connection));
}
NS_ENSURE_SUCCESS(rv, rv);
if (!newDB) {
PRInt32 databaseVersion;
rv = connection->GetSchemaVersion(&databaseVersion);
NS_ENSURE_SUCCESS(rv, rv);
if (databaseVersion != IMPLEMENTATION_VERSION) {
LOG(("Incompatible database, removing."));
rv = connection->Close();
NS_ENSURE_SUCCESS(rv, rv);
rv = mDBFile->Remove(false);
NS_ENSURE_SUCCESS(rv, rv);
newDB = true;
rv = storageService->OpenDatabase(mDBFile, getter_AddRefs(connection));
NS_ENSURE_SUCCESS(rv, rv);
}
}
connection->SetGrowthIncrement(5 * 1024 * 1024, EmptyCString());
rv = connection->ExecuteSimpleSQL(NS_LITERAL_CSTRING("PRAGMA synchronous=OFF"));
NS_ENSURE_SUCCESS(rv, rv);
rv = connection->CreateStatement
(NS_LITERAL_CSTRING("PRAGMA page_size"),
getter_AddRefs(mGetPageSizeStatement));
NS_ENSURE_SUCCESS(rv, rv);
rv = SetCacheSize(connection, gLookupCacheSize);
NS_ENSURE_SUCCESS(rv, rv);
if (newDB) {
rv = connection->SetSchemaVersion(IMPLEMENTATION_VERSION);
NS_ENSURE_SUCCESS(rv, rv);
}
// Create the table
rv = MaybeCreateTables(connection);
NS_ENSURE_SUCCESS(rv, rv);
rv = mMainStore.Init(this, connection,
NS_LITERAL_CSTRING("moz_classifier"));
NS_ENSURE_SUCCESS(rv, rv);
rv = mPendingSubStore.Init(this, connection,
NS_LITERAL_CSTRING("moz_subs"));
NS_ENSURE_SUCCESS(rv, rv);
rv = connection->CreateStatement
(NS_LITERAL_CSTRING("SELECT add_chunks, sub_chunks FROM moz_tables"
" WHERE id=?1"),
getter_AddRefs(mGetChunkListsStatement));
NS_ENSURE_SUCCESS(rv, rv);
rv = connection->CreateStatement
(NS_LITERAL_CSTRING("UPDATE moz_tables"
" SET add_chunks=?1, sub_chunks=?2"
" WHERE id=?3"),
getter_AddRefs(mSetChunkListsStatement));
NS_ENSURE_SUCCESS(rv, rv);
rv = connection->CreateStatement
(NS_LITERAL_CSTRING("SELECT name, add_chunks, sub_chunks"
" FROM moz_tables"),
getter_AddRefs(mGetTablesStatement));
NS_ENSURE_SUCCESS(rv, rv);
rv = connection->CreateStatement
(NS_LITERAL_CSTRING("SELECT id FROM moz_tables"
" WHERE name = ?1"),
getter_AddRefs(mGetTableIdStatement));
NS_ENSURE_SUCCESS(rv, rv);
rv = connection->CreateStatement
(NS_LITERAL_CSTRING("SELECT name FROM moz_tables"
" WHERE id = ?1"),
getter_AddRefs(mGetTableNameStatement));
NS_ENSURE_SUCCESS(rv, rv);
rv = connection->CreateStatement
(NS_LITERAL_CSTRING("INSERT INTO moz_tables(id, name, add_chunks, sub_chunks)"
" VALUES (null, ?1, null, null)"),
getter_AddRefs(mInsertTableIdStatement));
NS_ENSURE_SUCCESS(rv, rv);
mConnection = connection;
mCryptoHash = do_CreateInstance(NS_CRYPTO_HASH_CONTRACTID, &rv);
NS_ENSURE_SUCCESS(rv, rv);
LOG(("loading Prefix Set\n"));
rv = LoadPrefixSet(mPSFile);
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
// We have both a prefix and a domain. Drop the domain, but
// hash the domain, the prefix and a random value together,
// ensuring any collisions happens at a different points for
// different users.
// We need to calculate +- 500k hashes each update.
// The extensive initialization and finalization of normal
// cryptographic hashes, as well as fairly low speed, causes them
// to be prohibitively slow here, hence we can't use them.
// We use MurmurHash3 instead because it's reasonably well
// researched, trusted inside some other big projects, extremely
// fast and with a specific a 32-bit output version, and fairly
// compact. Upon testing with the actual prefix data, it does
// not appear to increase the number of collisions by any
// meaningful amount.
static nsresult KeyedHash(PRUint32 aPref, PRUint32 aDomain,
PRUint32 aKey, PRUint32 *aOut)
{
// This is a reimplementation of MurmurHash3 32-bit
// based on the public domain C++ sources.
// http://code.google.com/p/smhasher/source/browse/trunk/MurmurHash3.cpp
// for nblocks = 2
PRUint32 c1 = 0xCC9E2D51;
PRUint32 c2 = 0x1B873593;
PRUint32 c3 = 0xE6546B64;
PRUint32 c4 = 0x85EBCA6B;
PRUint32 c5 = 0xC2B2AE35;
PRUint32 h1 = aPref; // seed
PRUint32 k1;
PRUint32 karr[2];
karr[0] = aDomain;
karr[1] = aKey;
for (PRUint32 i = 0; i < 2; i++) {
k1 = karr[i];
k1 *= c1;
k1 = (k1 << 15) | (k1 >> (32-15));
k1 *= c2;
h1 ^= k1;
h1 = (h1 << 13) | (h1 >> (32-13));
h1 *= 5;
h1 += c3;
}
h1 ^= 2; // len
// fmix
h1 ^= h1 >> 16;
h1 *= c4;
h1 ^= h1 >> 13;
h1 *= c5;
h1 ^= h1 >> 16;
*aOut = h1;
return NS_OK;
}
nsresult nsUrlClassifierStore::ReadPrefixes(nsTArray<PRUint32>& array,
PRUint32 aKey)
{
mozStorageStatementScoper scoper(mAllPrefixStatement);
bool hasMoreData;
PRUint32 pcnt = 0;
PRUint32 fcnt = 0;
#if defined(PR_LOGGING)
PRIntervalTime clockStart = 0;
if (LOG_ENABLED()) {
clockStart = PR_IntervalNow();
}
#endif
while (NS_SUCCEEDED(mAllPrefixStatement->ExecuteStep(&hasMoreData)) && hasMoreData) {
PRUint32 prefixval;
PRUint32 domainval;
PRUint32 size;
const PRUint8 *blobdomain = mAllPrefixStatement->AsSharedBlob(0, &size);
if (!blobdomain || (size != DOMAIN_LENGTH))
return false;
domainval = *(reinterpret_cast<const PRUint32*>(blobdomain));
const PRUint8 *blobprefix = mAllPrefixStatement->AsSharedBlob(1, &size);
if (!blobprefix || (size != PARTIAL_LENGTH)) {
const PRUint8 *blobfull = mAllPrefixStatement->AsSharedBlob(2, &size);
if (!blobfull || (size != COMPLETE_LENGTH)) {
prefixval = domainval;
fcnt++;
} else {
prefixval = *(reinterpret_cast<const PRUint32*>(blobfull));
}
} else {
prefixval = *(reinterpret_cast<const PRUint32*>(blobprefix));
}
PRUint32 keyedVal;
nsresult rv = KeyedHash(prefixval, domainval, aKey, &keyedVal);
NS_ENSURE_SUCCESS(rv, rv);
array.AppendElement(keyedVal);
pcnt++;
}
LOG(("SB prefixes: %d fulldomain: %d\n", pcnt, fcnt));
#if defined(PR_LOGGING)
if (LOG_ENABLED()) {
PRIntervalTime clockEnd = PR_IntervalNow();
LOG(("Gathering took %dms\n",
PR_IntervalToMilliseconds(clockEnd - clockStart)));
}
#endif
return NS_OK;
}
nsresult
nsUrlClassifierDBServiceWorker::ConstructPrefixSet()
{
Telemetry::AutoTimer<Telemetry::URLCLASSIFIER_PS_CONSTRUCT_TIME> timer;
PRUint32 key;
nsresult rv = mPrefixSet->GetKey(&key);
NS_ENSURE_SUCCESS(rv, rv);
nsTArray<PRUint32> array;
rv = mMainStore.ReadPrefixes(array, key);
NS_ENSURE_SUCCESS(rv, rv);
#ifdef HASHFUNCTION_COLLISION_TEST
array.Sort();
PRUint32 collisions = 0;
for (int i = 1; i < array.Length(); i++) {
if (array[i - 1] == array[i]) {
collisions++;
}
}
LOG(("%d collisions in the set", collisions));
#endif
// clear old tree
rv = mPrefixSet->SetPrefixes(nsnull, 0);
NS_ENSURE_SUCCESS(rv, rv);
if (array.IsEmpty()) {
// DB is empty, but put a sentinel to show that we looked
array.AppendElement(0);
}
// construct new one
rv = mPrefixSet->SetPrefixes(array.Elements(), array.Length());
NS_ENSURE_SUCCESS(rv, rv);
// store the new tree to disk
rv = mPrefixSet->StoreToFile(mPSFile);
NS_WARN_IF_FALSE(NS_SUCCEEDED(rv), "failed to store the prefixset");
return NS_OK;
}
nsresult
nsUrlClassifierDBServiceWorker::LoadPrefixSet(nsCOMPtr<nsIFile> & aFile)
{
bool empty;
nsresult rv = mPrefixSet->IsEmpty(&empty);
NS_ENSURE_SUCCESS(rv, rv);
if (!empty) {
LOG(("PrefixSet already loaded, not loading again"));
return NS_OK;
}
bool exists;
rv = aFile->Exists(&exists);
NS_ENSURE_SUCCESS(rv, rv);
#if defined(PR_LOGGING)
PRIntervalTime clockStart = 0;
if (LOG_ENABLED()) {
clockStart = PR_IntervalNow();
}
#endif
if (exists) {
Telemetry::AutoTimer<Telemetry::URLCLASSIFIER_PS_FILELOAD_TIME> timer;
LOG(("stored PrefixSet exists, loading from disk"));
rv = mPrefixSet->LoadFromFile(aFile);
}
if (!exists || NS_FAILED(rv)) {
LOG(("no (usable) stored PrefixSet found, constructing from store"));
ConstructPrefixSet();
}
#ifdef DEBUG
PRUint32 size = 0;
rv = mPrefixSet->SizeOfIncludingThis(&size);
LOG(("SB tree done, size = %d bytes\n", size));
NS_ENSURE_SUCCESS(rv, rv);
#endif
#if defined(PR_LOGGING)
if (LOG_ENABLED()) {
PRIntervalTime clockEnd = PR_IntervalNow();
LOG(("Loading took %dms\n",
PR_IntervalToMilliseconds(clockEnd - clockStart)));
}
#endif
return NS_OK;
}
nsresult
nsUrlClassifierDBServiceWorker::MaybeCreateTables(mozIStorageConnection* connection)
{
LOG(("MaybeCreateTables\n"));
nsresult rv = connection->ExecuteSimpleSQL(
NS_LITERAL_CSTRING("CREATE TABLE IF NOT EXISTS moz_classifier"
" (id INTEGER PRIMARY KEY,"
" domain BLOB,"
" partial_data BLOB,"
" complete_data BLOB,"
" chunk_id INTEGER,"
" table_id INTEGER)"));
NS_ENSURE_SUCCESS(rv, rv);
rv = connection->ExecuteSimpleSQL(
NS_LITERAL_CSTRING("CREATE INDEX IF NOT EXISTS"
" moz_classifier_domain_index"
" ON moz_classifier(domain)"));
NS_ENSURE_SUCCESS(rv, rv);
rv = connection->ExecuteSimpleSQL(
NS_LITERAL_CSTRING("CREATE INDEX IF NOT EXISTS"
" moz_classifier_chunk_index"
" ON moz_classifier(chunk_id)"));
NS_ENSURE_SUCCESS(rv, rv);
rv = connection->ExecuteSimpleSQL(
NS_LITERAL_CSTRING("CREATE TABLE IF NOT EXISTS moz_subs"
" (id INTEGER PRIMARY KEY,"
" domain BLOB,"
" partial_data BLOB,"
" complete_data BLOB,"
" chunk_id INTEGER,"
" table_id INTEGER,"
" add_chunk_id INTEGER)"));
NS_ENSURE_SUCCESS(rv, rv);
rv = connection->ExecuteSimpleSQL(
NS_LITERAL_CSTRING("CREATE INDEX IF NOT EXISTS"
" moz_subs_addchunk_index"
" ON moz_subs(add_chunk_id)"));
NS_ENSURE_SUCCESS(rv, rv);
rv = connection->ExecuteSimpleSQL(
NS_LITERAL_CSTRING("CREATE INDEX IF NOT EXISTS"
" moz_subs_chunk_index"
" ON moz_subs(chunk_id)"));
NS_ENSURE_SUCCESS(rv, rv);
rv = connection->ExecuteSimpleSQL(
NS_LITERAL_CSTRING("CREATE TABLE IF NOT EXISTS moz_tables"
" (id INTEGER PRIMARY KEY,"
" name TEXT,"
" add_chunks TEXT,"
" sub_chunks TEXT);"));
NS_ENSURE_SUCCESS(rv, rv);
return rv;
}
// -------------------------------------------------------------------------
// nsUrlClassifierLookupCallback
//
// This class takes the results of a lookup found on the worker thread
// and handles any necessary partial hash expansions before calling
// the client callback.
class nsUrlClassifierLookupCallback : public nsIUrlClassifierLookupCallback
, public nsIUrlClassifierHashCompleterCallback
{
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIURLCLASSIFIERLOOKUPCALLBACK
NS_DECL_NSIURLCLASSIFIERHASHCOMPLETERCALLBACK
nsUrlClassifierLookupCallback(nsUrlClassifierDBService *dbservice,
nsIUrlClassifierCallback *c)
: mDBService(dbservice)
, mResults(nsnull)
, mPendingCompletions(0)
, mCallback(c)
{}
private:
nsresult HandleResults();
nsRefPtr<nsUrlClassifierDBService> mDBService;
nsAutoPtr<nsTArray<nsUrlClassifierLookupResult> > mResults;
// Completed results to send back to the worker for caching.
nsAutoPtr<nsTArray<nsUrlClassifierLookupResult> > mCacheResults;
PRUint32 mPendingCompletions;
nsCOMPtr<nsIUrlClassifierCallback> mCallback;
};
NS_IMPL_THREADSAFE_ISUPPORTS2(nsUrlClassifierLookupCallback,
nsIUrlClassifierLookupCallback,
nsIUrlClassifierHashCompleterCallback)
NS_IMETHODIMP
nsUrlClassifierLookupCallback::LookupComplete(nsTArray<nsUrlClassifierLookupResult>* results)
{
NS_ASSERTION(mResults == nsnull,
"Should only get one set of results per nsUrlClassifierLookupCallback!");
if (!results) {
HandleResults();
return NS_OK;
}
mResults = results;
mResults->Sort();
// Check the results entries that need to be completed.
for (PRUint32 i = 0; i < results->Length(); i++) {
nsUrlClassifierLookupResult& result = results->ElementAt(i);
// We will complete partial matches and matches that are stale.
if (!result.mConfirmed) {
nsCOMPtr<nsIUrlClassifierHashCompleter> completer;
if (mDBService->GetCompleter(result.mTableName,
getter_AddRefs(completer))) {
nsCAutoString partialHash;
PRUint8 *buf =
result.mEntry.mHavePartial ? result.mEntry.mPartialHash.buf
: result.mEntry.mCompleteHash.buf;
partialHash.Assign(reinterpret_cast<char*>(buf), PARTIAL_LENGTH);
nsresult rv = completer->Complete(partialHash, this);
if (NS_SUCCEEDED(rv)) {
mPendingCompletions++;
}
} else {
// For tables with no hash completer, a complete hash match is
// good enough, it doesn't need to be fresh. (we need the
// mLookupFragment comparison to weed out noise entries, which
// should never be confirmed).
if (result.mEntry.mHaveComplete
&& (result.mLookupFragment == result.mEntry.mCompleteHash)) {
result.mConfirmed = true;
} else {
NS_WARNING("Partial match in a table without a valid completer, ignoring partial match.");
}
}
}
}
if (mPendingCompletions == 0) {
// All results were complete, we're ready!
HandleResults();
}
return NS_OK;
}
NS_IMETHODIMP
nsUrlClassifierLookupCallback::CompletionFinished(nsresult status)
{
LOG(("nsUrlClassifierLookupCallback::CompletionFinished [%p, %08x]",
this, status));
if (NS_FAILED(status)) {
NS_WARNING("gethash response failed.");
}
mPendingCompletions--;
if (mPendingCompletions == 0) {
HandleResults();
if (mCacheResults) {
// This hands ownership of the cache results array back to the worker
// thread.
mDBService->CacheCompletions(mCacheResults.forget());
}
}
return NS_OK;
}
NS_IMETHODIMP
nsUrlClassifierLookupCallback::Completion(const nsACString& completeHash,
const nsACString& tableName,
PRUint32 chunkId,
bool verified)
{
LOG(("nsUrlClassifierLookupCallback::Completion [%p, %s, %d, %d]",
this, PromiseFlatCString(tableName).get(), chunkId, verified));
nsUrlClassifierCompleteHash hash;
hash.Assign(completeHash);
for (PRUint32 i = 0; i < mResults->Length(); i++) {
nsUrlClassifierLookupResult& result = mResults->ElementAt(i);
// First, see if this result can be used to update an entry.
if (verified &&
!result.mEntry.mHaveComplete &&
hash.StartsWith(result.mEntry.mPartialHash) &&
result.mTableName == tableName &&
result.mEntry.mChunkId == chunkId) {
// We have a completion for this entry. Fill it in...
result.mEntry.SetHash(hash);
if (!mCacheResults) {
mCacheResults = new nsTArray<nsUrlClassifierLookupResult>();
if (!mCacheResults)
return NS_ERROR_OUT_OF_MEMORY;
}
mCacheResults->AppendElement(result);
}
// Now, see if it verifies a lookup
if (result.mLookupFragment == hash) {
result.mConfirmed = true;
if (result.mTableName != tableName ||
result.mEntry.mChunkId != chunkId) {
// The hash we got for this completion matches the hash we
// looked up, but doesn't match the table/chunk id. This could
// happen in rare cases where a given URL was moved between
// lists or added/removed/re-added to the list in the time since
// we've updated.
//
// Update the lookup result, but don't update the entry or try
// cache the results of this completion, as it might confuse
// things.
result.mTableName = tableName;
NS_WARNING("Accepting a gethash with an invalid table name or chunk id");
LOG(("Tablename: %s ?= %s, ChunkId %d ?= %d",
result.mTableName.get(), PromiseFlatCString(tableName).get(),
result.mEntry.mChunkId, chunkId));
}
}
}
return NS_OK;
}
nsresult
nsUrlClassifierLookupCallback::HandleResults()
{
if (!mResults) {
// No results, this URI is clean.
return mCallback->HandleEvent(NS_LITERAL_CSTRING(""));
}
// Build a stringified list of result tables.
mResults->Sort();
PRUint32 lastTableId = 0;
nsCAutoString tables;
for (PRUint32 i = 0; i < mResults->Length(); i++) {
nsUrlClassifierLookupResult& result = mResults->ElementAt(i);
// Leave out results that weren't confirmed, as their existence on
// the list can't be verified. Also leave out randomly-generated
// noise.
if (!result.mConfirmed || result.mNoise)
continue;
if (tables.Length() > 0) {
if (lastTableId == result.mEntry.mTableId)
continue;
tables.Append(",");
}
tables.Append(result.mTableName);
lastTableId = result.mEntry.mTableId;
}
return mCallback->HandleEvent(tables);
}
// -------------------------------------------------------------------------
// Helper class for nsIURIClassifier implementation, translates table names
// to nsIURIClassifier enums.
class nsUrlClassifierClassifyCallback : public nsIUrlClassifierCallback
{
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIURLCLASSIFIERCALLBACK
nsUrlClassifierClassifyCallback(nsIURIClassifierCallback *c,
bool checkMalware,
bool checkPhishing)
: mCallback(c)
, mCheckMalware(checkMalware)
, mCheckPhishing(checkPhishing)
{}
private:
nsCOMPtr<nsIURIClassifierCallback> mCallback;
bool mCheckMalware;
bool mCheckPhishing;
};
NS_IMPL_THREADSAFE_ISUPPORTS1(nsUrlClassifierClassifyCallback,
nsIUrlClassifierCallback)
NS_IMETHODIMP
nsUrlClassifierClassifyCallback::HandleEvent(const nsACString& tables)
{
// XXX: we should probably have the wardens tell the service which table
// names match with which classification. For now the table names give
// enough information.
nsresult response = NS_OK;
nsACString::const_iterator begin, end;
tables.BeginReading(begin);
tables.EndReading(end);
if (mCheckMalware &&
FindInReadable(NS_LITERAL_CSTRING("-malware-"), begin, end)) {
response = NS_ERROR_MALWARE_URI;
} else {
// Reset begin before checking phishing table
tables.BeginReading(begin);
if (mCheckPhishing &&
FindInReadable(NS_LITERAL_CSTRING("-phish-"), begin, end)) {
response = NS_ERROR_PHISHING_URI;
}
}
mCallback->OnClassifyComplete(response);
return NS_OK;
}
// -------------------------------------------------------------------------
// Proxy class implementation
NS_IMPL_THREADSAFE_ISUPPORTS3(nsUrlClassifierDBService,
nsIUrlClassifierDBService,
nsIURIClassifier,
nsIObserver)
/* static */ nsUrlClassifierDBService*
nsUrlClassifierDBService::GetInstance(nsresult *result)
{
*result = NS_OK;
if (!sUrlClassifierDBService) {
sUrlClassifierDBService = new nsUrlClassifierDBService();
if (!sUrlClassifierDBService) {
*result = NS_ERROR_OUT_OF_MEMORY;
return nsnull;
}
NS_ADDREF(sUrlClassifierDBService); // addref the global
*result = sUrlClassifierDBService->Init();
if (NS_FAILED(*result)) {
NS_RELEASE(sUrlClassifierDBService);
return nsnull;
}
} else {
// Already exists, just add a ref
NS_ADDREF(sUrlClassifierDBService); // addref the return result
}
return sUrlClassifierDBService;
}
nsUrlClassifierDBService::nsUrlClassifierDBService()
: mCheckMalware(CHECK_MALWARE_DEFAULT)
, mCheckPhishing(CHECK_PHISHING_DEFAULT)
, mInUpdate(false)
{
}
nsUrlClassifierDBService::~nsUrlClassifierDBService()
{
sUrlClassifierDBService = nsnull;
}
nsresult
nsUrlClassifierDBService::Init()
{
#if defined(PR_LOGGING)
if (!gUrlClassifierDbServiceLog)
gUrlClassifierDbServiceLog = PR_NewLogModule("UrlClassifierDbService");
#endif
// Force the storage service to be created on the main thread.
nsresult rv;
nsCOMPtr<mozIStorageService> storageService =
do_GetService(MOZ_STORAGE_SERVICE_CONTRACTID, &rv);
NS_ENSURE_SUCCESS(rv, rv);
// Force PSM to be loaded on the main thread.
mHash = do_CreateInstance(NS_CRYPTO_HASH_CONTRACTID, &rv);
NS_ENSURE_SUCCESS(rv, rv);
mPrefixSet = new nsUrlClassifierPrefixSet();
NS_ENSURE_SUCCESS(rv, rv);
// Should we check document loads for malware URIs?
nsCOMPtr<nsIPrefBranch2> prefs = do_GetService(NS_PREFSERVICE_CONTRACTID);
PRInt32 gethashNoise = 0;
if (prefs) {
bool tmpbool;
rv = prefs->GetBoolPref(CHECK_MALWARE_PREF, &tmpbool);
mCheckMalware = NS_SUCCEEDED(rv) ? tmpbool : CHECK_MALWARE_DEFAULT;
prefs->AddObserver(CHECK_MALWARE_PREF, this, false);
rv = prefs->GetBoolPref(CHECK_PHISHING_PREF, &tmpbool);
mCheckPhishing = NS_SUCCEEDED(rv) ? tmpbool : CHECK_PHISHING_DEFAULT;
prefs->AddObserver(CHECK_PHISHING_PREF, this, false);
if (NS_FAILED(prefs->GetIntPref(GETHASH_NOISE_PREF, &gethashNoise))) {
gethashNoise = GETHASH_NOISE_DEFAULT;
}
nsXPIDLCString tmpstr;
if (NS_SUCCEEDED(prefs->GetCharPref(GETHASH_TABLES_PREF, getter_Copies(tmpstr)))) {
SplitTables(tmpstr, mGethashWhitelist);
}
prefs->AddObserver(GETHASH_TABLES_PREF, this, false);
PRInt32 tmpint;
rv = prefs->GetIntPref(CONFIRM_AGE_PREF, &tmpint);
PR_ATOMIC_SET(&gFreshnessGuarantee, NS_SUCCEEDED(rv) ? tmpint : CONFIRM_AGE_DEFAULT_SEC);
prefs->AddObserver(CONFIRM_AGE_PREF, this, false);
rv = prefs->GetIntPref(UPDATE_CACHE_SIZE_PREF, &tmpint);
PR_ATOMIC_SET(&gUpdateCacheSize, NS_SUCCEEDED(rv) ? tmpint : UPDATE_CACHE_SIZE_DEFAULT);
rv = prefs->GetIntPref(LOOKUP_CACHE_SIZE_PREF, &tmpint);
PR_ATOMIC_SET(&gLookupCacheSize, NS_SUCCEEDED(rv) ? tmpint : LOOKUP_CACHE_SIZE_DEFAULT);
rv = prefs->GetIntPref(UPDATE_WORKING_TIME, &tmpint);
PR_ATOMIC_SET(&gWorkingTimeThreshold,
NS_SUCCEEDED(rv) ? tmpint : UPDATE_WORKING_TIME_DEFAULT);
rv = prefs->GetIntPref(UPDATE_DELAY_TIME, &tmpint);
PR_ATOMIC_SET(&gDelayTime,
NS_SUCCEEDED(rv) ? tmpint : UPDATE_DELAY_TIME_DEFAULT);
}
// Start the background thread.
rv = NS_NewThread(&gDbBackgroundThread);
if (NS_FAILED(rv))
return rv;
mWorker = new nsUrlClassifierDBServiceWorker();
if (!mWorker)
return NS_ERROR_OUT_OF_MEMORY;
rv = mWorker->Init(gethashNoise, mPrefixSet);
if (NS_FAILED(rv)) {
mWorker = nsnull;
return rv;
}
// Proxy for calling the worker on the background thread
mWorkerProxy = new UrlClassifierDBServiceWorkerProxy(mWorker);
mCompleters.Init();
// Add an observer for shutdown
nsCOMPtr<nsIObserverService> observerService =
mozilla::services::GetObserverService();
if (!observerService)
return NS_ERROR_FAILURE;
observerService->AddObserver(this, "profile-before-change", false);
observerService->AddObserver(this, "xpcom-shutdown-threads", false);
return NS_OK;
}
NS_IMETHODIMP
nsUrlClassifierDBService::Classify(nsIURI *uri,
nsIURIClassifierCallback* c,
bool* result)
{
NS_ENSURE_TRUE(gDbBackgroundThread, NS_ERROR_NOT_INITIALIZED);
if (!(mCheckMalware || mCheckPhishing)) {
*result = false;
return NS_OK;
}
nsRefPtr<nsUrlClassifierClassifyCallback> callback =
new nsUrlClassifierClassifyCallback(c, mCheckMalware, mCheckPhishing);
if (!callback) return NS_ERROR_OUT_OF_MEMORY;
nsresult rv = LookupURI(uri, callback, false, result);
if (rv == NS_ERROR_MALFORMED_URI) {
*result = false;
// The URI had no hostname, don't try to classify it.
return NS_OK;
}
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
NS_IMETHODIMP
nsUrlClassifierDBService::Lookup(const nsACString& spec,
nsIUrlClassifierCallback* c)
{
NS_ENSURE_TRUE(gDbBackgroundThread, NS_ERROR_NOT_INITIALIZED);
nsCOMPtr<nsIURI> uri;
nsresult rv = NS_NewURI(getter_AddRefs(uri), spec);
NS_ENSURE_SUCCESS(rv, rv);
uri = NS_GetInnermostURI(uri);
if (!uri) {
return NS_ERROR_FAILURE;
}
bool didLookup;
return LookupURI(uri, c, true, &didLookup);
}
nsresult
nsUrlClassifierDBService::LookupURI(nsIURI* uri,
nsIUrlClassifierCallback* c,
bool forceLookup,
bool *didLookup)
{
NS_ENSURE_TRUE(gDbBackgroundThread, NS_ERROR_NOT_INITIALIZED);
nsCAutoString key;
// Canonicalize the url
nsCOMPtr<nsIUrlClassifierUtils> utilsService =
do_GetService(NS_URLCLASSIFIERUTILS_CONTRACTID);
nsresult rv = utilsService->GetKeyForURI(uri, key);
if (NS_FAILED(rv))
return rv;
if (forceLookup) {
*didLookup = true;
} else {
// Check if the URI is clean. If so, we don't need to
// bother queueing up a lookup, we can just return.;
bool clean;
rv = CheckClean(key, &clean);
NS_ENSURE_SUCCESS(rv, rv);
if (!clean) {
nsCOMPtr<nsIPermissionManager> permissionManager =
do_GetService(NS_PERMISSIONMANAGER_CONTRACTID);
if (permissionManager) {
PRUint32 perm;
permissionManager->TestPermission(uri, "safe-browsing", &perm);
clean |= (perm == nsIPermissionManager::ALLOW_ACTION);
}
}
*didLookup = !clean;
if (clean) {
return NS_OK;
}
}
// Create an nsUrlClassifierLookupCallback object. This object will
// take care of confirming partial hash matches if necessary before
// calling the client's callback.
nsCOMPtr<nsIUrlClassifierLookupCallback> callback =
new nsUrlClassifierLookupCallback(this, c);
if (!callback)
return NS_ERROR_OUT_OF_MEMORY;
nsCOMPtr<nsIUrlClassifierLookupCallback> proxyCallback =
new UrlClassifierLookupCallbackProxy(callback);
// Queue this lookup and call the lookup function to flush the queue if
// necessary.
rv = mWorker->QueueLookup(key, proxyCallback);
NS_ENSURE_SUCCESS(rv, rv);
return mWorkerProxy->Lookup(EmptyCString(), nsnull);
}
NS_IMETHODIMP
nsUrlClassifierDBService::GetTables(nsIUrlClassifierCallback* c)
{
NS_ENSURE_TRUE(gDbBackgroundThread, NS_ERROR_NOT_INITIALIZED);
nsresult rv;
// The proxy callback uses the current thread.
nsCOMPtr<nsIUrlClassifierCallback> proxyCallback =
new UrlClassifierCallbackProxy(c);
return mWorkerProxy->GetTables(proxyCallback);
}
NS_IMETHODIMP
nsUrlClassifierDBService::SetHashCompleter(const nsACString &tableName,
nsIUrlClassifierHashCompleter *completer)
{
if (completer) {
if (!mCompleters.Put(tableName, completer)) {
return NS_ERROR_OUT_OF_MEMORY;
}
} else {
mCompleters.Remove(tableName);
}
return NS_OK;
}
NS_IMETHODIMP
nsUrlClassifierDBService::BeginUpdate(nsIUrlClassifierUpdateObserver *observer,
const nsACString &updateTables,
const nsACString &clientKey)
{
NS_ENSURE_TRUE(gDbBackgroundThread, NS_ERROR_NOT_INITIALIZED);
if (mInUpdate)
return NS_ERROR_NOT_AVAILABLE;
mInUpdate = true;
nsresult rv;
// The proxy observer uses the current thread
nsCOMPtr<nsIUrlClassifierUpdateObserver> proxyObserver =
new UrlClassifierUpdateObserverProxy(observer);
return mWorkerProxy->BeginUpdate(proxyObserver, updateTables, clientKey);
}
NS_IMETHODIMP
nsUrlClassifierDBService::BeginStream(const nsACString &table,
const nsACString &serverMAC)
{
NS_ENSURE_TRUE(gDbBackgroundThread, NS_ERROR_NOT_INITIALIZED);
return mWorkerProxy->BeginStream(table, serverMAC);
}
NS_IMETHODIMP
nsUrlClassifierDBService::UpdateStream(const nsACString& aUpdateChunk)
{
NS_ENSURE_TRUE(gDbBackgroundThread, NS_ERROR_NOT_INITIALIZED);
return mWorkerProxy->UpdateStream(aUpdateChunk);
}
NS_IMETHODIMP
nsUrlClassifierDBService::FinishStream()
{
NS_ENSURE_TRUE(gDbBackgroundThread, NS_ERROR_NOT_INITIALIZED);
return mWorkerProxy->FinishStream();
}
NS_IMETHODIMP
nsUrlClassifierDBService::FinishUpdate()
{
NS_ENSURE_TRUE(gDbBackgroundThread, NS_ERROR_NOT_INITIALIZED);
mInUpdate = false;
return mWorkerProxy->FinishUpdate();
}
NS_IMETHODIMP
nsUrlClassifierDBService::CancelUpdate()
{
NS_ENSURE_TRUE(gDbBackgroundThread, NS_ERROR_NOT_INITIALIZED);
mInUpdate = false;
return mWorkerProxy->CancelUpdate();
}
NS_IMETHODIMP
nsUrlClassifierDBService::ResetDatabase()
{
NS_ENSURE_TRUE(gDbBackgroundThread, NS_ERROR_NOT_INITIALIZED);
return mWorkerProxy->ResetDatabase();
}
nsresult
nsUrlClassifierDBService::CacheCompletions(nsTArray<nsUrlClassifierLookupResult> *results)
{
NS_ENSURE_TRUE(gDbBackgroundThread, NS_ERROR_NOT_INITIALIZED);
return mWorkerProxy->CacheCompletions(results);
}
bool
nsUrlClassifierDBService::GetCompleter(const nsACString &tableName,
nsIUrlClassifierHashCompleter **completer)
{
if (mCompleters.Get(tableName, completer)) {
return true;
}
if (!mGethashWhitelist.Contains(tableName)) {
return false;
}
return NS_SUCCEEDED(CallGetService(NS_URLCLASSIFIERHASHCOMPLETER_CONTRACTID,
completer));
}
NS_IMETHODIMP
nsUrlClassifierDBService::Observe(nsISupports *aSubject, const char *aTopic,
const PRUnichar *aData)
{
if (!strcmp(aTopic, NS_PREFBRANCH_PREFCHANGE_TOPIC_ID)) {
nsresult rv;
nsCOMPtr<nsIPrefBranch> prefs(do_QueryInterface(aSubject, &rv));
NS_ENSURE_SUCCESS(rv, rv);
if (NS_LITERAL_STRING(CHECK_MALWARE_PREF).Equals(aData)) {
bool tmpbool;
rv = prefs->GetBoolPref(CHECK_MALWARE_PREF, &tmpbool);
mCheckMalware = NS_SUCCEEDED(rv) ? tmpbool : CHECK_MALWARE_DEFAULT;
} else if (NS_LITERAL_STRING(CHECK_PHISHING_PREF).Equals(aData)) {
bool tmpbool;
rv = prefs->GetBoolPref(CHECK_PHISHING_PREF, &tmpbool);
mCheckPhishing = NS_SUCCEEDED(rv) ? tmpbool : CHECK_PHISHING_DEFAULT;
} else if (NS_LITERAL_STRING(GETHASH_TABLES_PREF).Equals(aData)) {
mGethashWhitelist.Clear();
nsXPIDLCString val;
if (NS_SUCCEEDED(prefs->GetCharPref(GETHASH_TABLES_PREF, getter_Copies(val)))) {
SplitTables(val, mGethashWhitelist);
}
} else if (NS_LITERAL_STRING(CONFIRM_AGE_PREF).Equals(aData)) {
PRInt32 tmpint;
rv = prefs->GetIntPref(CONFIRM_AGE_PREF, &tmpint);
PR_ATOMIC_SET(&gFreshnessGuarantee, NS_SUCCEEDED(rv) ? tmpint : CONFIRM_AGE_DEFAULT_SEC);
} else if (NS_LITERAL_STRING(UPDATE_CACHE_SIZE_PREF).Equals(aData)) {
PRInt32 tmpint;
rv = prefs->GetIntPref(UPDATE_CACHE_SIZE_PREF, &tmpint);
PR_ATOMIC_SET(&gUpdateCacheSize, NS_SUCCEEDED(rv) ? tmpint : UPDATE_CACHE_SIZE_DEFAULT);
} else if (NS_LITERAL_STRING(LOOKUP_CACHE_SIZE_PREF).Equals(aData)) {
PRInt32 tmpint;
rv = prefs->GetIntPref(LOOKUP_CACHE_SIZE_PREF, &tmpint);
PR_ATOMIC_SET(&gLookupCacheSize, NS_SUCCEEDED(rv) ? tmpint : LOOKUP_CACHE_SIZE_DEFAULT);
} else if (NS_LITERAL_STRING(UPDATE_WORKING_TIME).Equals(aData)) {
PRInt32 tmpint;
rv = prefs->GetIntPref(UPDATE_WORKING_TIME, &tmpint);
PR_ATOMIC_SET(&gWorkingTimeThreshold,
NS_SUCCEEDED(rv) ? tmpint : UPDATE_WORKING_TIME_DEFAULT);
} else if (NS_LITERAL_STRING(UPDATE_DELAY_TIME).Equals(aData)) {
PRInt32 tmpint;
rv = prefs->GetIntPref(UPDATE_DELAY_TIME, &tmpint);
PR_ATOMIC_SET(&gDelayTime,
NS_SUCCEEDED(rv) ? tmpint : UPDATE_DELAY_TIME_DEFAULT);
}
} else if (!strcmp(aTopic, "profile-before-change") ||
!strcmp(aTopic, "xpcom-shutdown-threads")) {
Shutdown();
} else {
return NS_ERROR_UNEXPECTED;
}
return NS_OK;
}
// Join the background thread if it exists.
nsresult
nsUrlClassifierDBService::Shutdown()
{
LOG(("shutting down db service\n"));
if (!gDbBackgroundThread)
return NS_OK;
mCompleters.Clear();
nsCOMPtr<nsIPrefBranch2> prefs = do_GetService(NS_PREFSERVICE_CONTRACTID);
if (prefs) {
prefs->RemoveObserver(CHECK_MALWARE_PREF, this);
prefs->RemoveObserver(CHECK_PHISHING_PREF, this);
prefs->RemoveObserver(GETHASH_TABLES_PREF, this);
prefs->RemoveObserver(CONFIRM_AGE_PREF, this);
}
nsresult rv;
// First close the db connection.
if (mWorker) {
rv = mWorkerProxy->CancelUpdate();
NS_ASSERTION(NS_SUCCEEDED(rv), "failed to post cancel update event");
rv = mWorkerProxy->CloseDb();
NS_ASSERTION(NS_SUCCEEDED(rv), "failed to post close db event");
}
mWorkerProxy = nsnull;
LOG(("joining background thread"));
gShuttingDownThread = true;
nsIThread *backgroundThread = gDbBackgroundThread;
gDbBackgroundThread = nsnull;
backgroundThread->Shutdown();
NS_RELEASE(backgroundThread);
return NS_OK;
}
nsIThread*
nsUrlClassifierDBService::BackgroundThread()
{
return gDbBackgroundThread;
}
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