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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
// This service reads a file of rules describing TLD-like domain names. For a
// complete description of the expected file format and parsing rules, see
#include "mozilla/ArrayUtils.h"
#include "mozilla/HashFunctions.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/ResultExtensions.h"
#include "mozilla/TextUtils.h"
#include "MainThreadUtils.h"
#include "nsContentUtils.h"
#include "nsCRT.h"
#include "nsEffectiveTLDService.h"
#include "nsIFile.h"
#include "nsIIDNService.h"
#include "nsIObserverService.h"
#include "nsIURI.h"
#include "nsNetCID.h"
#include "nsNetUtil.h"
#include "nsServiceManagerUtils.h"
#include "mozilla/net/DNS.h"
namespace etld_dafsa {
// Generated file that includes kDafsa
#include "etld_data.inc"
} // namespace etld_dafsa
using namespace mozilla;
NS_IMPL_ISUPPORTS(nsEffectiveTLDService, nsIEffectiveTLDService,
nsIMemoryReporter, nsIObserver)
// ----------------------------------------------------------------------
static nsEffectiveTLDService* gService = nullptr;
nsEffectiveTLDService::nsEffectiveTLDService()
: mIDNService(), mGraphLock("nsEffectiveTLDService::mGraph") {
mGraph.emplace(etld_dafsa::kDafsa);
}
nsresult nsEffectiveTLDService::Init() {
nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
obs->AddObserver(this, "public-suffix-list-updated", false);
if (gService) {
return NS_ERROR_ALREADY_INITIALIZED;
}
nsresult rv;
mIDNService = do_GetService(NS_IDNSERVICE_CONTRACTID, &rv);
if (NS_FAILED(rv)) {
return rv;
}
gService = this;
RegisterWeakMemoryReporter(this);
return NS_OK;
}
NS_IMETHODIMP nsEffectiveTLDService::Observe(nsISupports* aSubject,
const char* aTopic,
const char16_t* aData) {
/**
* Signal sent from netwerk/dns/PublicSuffixList.jsm
* aSubject is the nsIFile object for dafsa.bin
* aData is the absolute path to the dafsa.bin file (not used)
*/
if (aSubject && (nsCRT::strcmp(aTopic, "public-suffix-list-updated") == 0)) {
nsCOMPtr<nsIFile> mDafsaBinFile(do_QueryInterface(aSubject));
NS_ENSURE_TRUE(mDafsaBinFile, NS_ERROR_ILLEGAL_VALUE);
AutoWriteLock lock(mGraphLock);
// Reset mGraph with kDafsa in case reassigning to mDafsaMap fails
mGraph.reset();
mGraph.emplace(etld_dafsa::kDafsa);
mDafsaMap.reset();
mMruTable.Clear();
MOZ_TRY(mDafsaMap.init(mDafsaBinFile));
size_t size = mDafsaMap.size();
const uint8_t* remoteDafsaPtr = mDafsaMap.get<uint8_t>().get();
auto remoteDafsa = mozilla::Span(remoteDafsaPtr, size);
mGraph.reset();
mGraph.emplace(remoteDafsa);
}
return NS_OK;
}
nsEffectiveTLDService::~nsEffectiveTLDService() {
UnregisterWeakMemoryReporter(this);
if (mIDNService) {
// Only clear gService if Init() finished successfully.
gService = nullptr;
}
}
// static
nsEffectiveTLDService* nsEffectiveTLDService::GetInstance() {
if (gService) {
return gService;
}
nsCOMPtr<nsIEffectiveTLDService> tldService =
do_GetService(NS_EFFECTIVETLDSERVICE_CONTRACTID);
if (!tldService) {
return nullptr;
}
MOZ_ASSERT(
gService,
"gService must have been initialized in nsEffectiveTLDService::Init");
return gService;
}
MOZ_DEFINE_MALLOC_SIZE_OF(EffectiveTLDServiceMallocSizeOf)
// The amount of heap memory measured here is tiny. It used to be bigger when
// nsEffectiveTLDService used a separate hash table instead of binary search.
// Nonetheless, we keep this code here in anticipation of bug 1083971 which will
// change ETLDEntries::entries to a heap-allocated array modifiable at runtime.
NS_IMETHODIMP
nsEffectiveTLDService::CollectReports(nsIHandleReportCallback* aHandleReport,
nsISupports* aData, bool aAnonymize) {
MOZ_COLLECT_REPORT("explicit/network/effective-TLD-service", KIND_HEAP,
UNITS_BYTES,
SizeOfIncludingThis(EffectiveTLDServiceMallocSizeOf),
"Memory used by the effective TLD service.");
return NS_OK;
}
size_t nsEffectiveTLDService::SizeOfIncludingThis(
mozilla::MallocSizeOf aMallocSizeOf) {
size_t n = aMallocSizeOf(this);
// Measurement of the following members may be added later if DMD finds it is
// worthwhile:
// - mIDNService
return n;
}
// External function for dealing with URI's correctly.
// Pulls out the host portion from an nsIURI, and calls through to
// GetPublicSuffixFromHost().
NS_IMETHODIMP
nsEffectiveTLDService::GetPublicSuffix(nsIURI* aURI,
nsACString& aPublicSuffix) {
NS_ENSURE_ARG_POINTER(aURI);
nsAutoCString host;
nsresult rv = NS_GetInnermostURIHost(aURI, host);
if (NS_FAILED(rv)) {
return rv;
}
return GetBaseDomainInternal(host, 0, false, aPublicSuffix);
}
NS_IMETHODIMP
nsEffectiveTLDService::GetKnownPublicSuffix(nsIURI* aURI,
nsACString& aPublicSuffix) {
NS_ENSURE_ARG_POINTER(aURI);
nsAutoCString host;
nsresult rv = NS_GetInnermostURIHost(aURI, host);
if (NS_FAILED(rv)) {
return rv;
}
return GetBaseDomainInternal(host, 0, true, aPublicSuffix);
}
// External function for dealing with URI's correctly.
// Pulls out the host portion from an nsIURI, and calls through to
// GetBaseDomainFromHost().
NS_IMETHODIMP
nsEffectiveTLDService::GetBaseDomain(nsIURI* aURI, uint32_t aAdditionalParts,
nsACString& aBaseDomain) {
NS_ENSURE_ARG_POINTER(aURI);
NS_ENSURE_TRUE(((int32_t)aAdditionalParts) >= 0, NS_ERROR_INVALID_ARG);
nsAutoCString host;
nsresult rv = NS_GetInnermostURIHost(aURI, host);
if (NS_FAILED(rv)) {
return rv;
}
return GetBaseDomainInternal(host, aAdditionalParts + 1, false, aBaseDomain);
}
// External function for dealing with URIs to get a schemeless site.
// Calls through to GetBaseDomain(), handling IP addresses and aliases by
// just returning their serialized host.
NS_IMETHODIMP
nsEffectiveTLDService::GetSchemelessSite(nsIURI* aURI, nsACString& aSite) {
NS_ENSURE_ARG_POINTER(aURI);
nsresult rv = GetBaseDomain(aURI, 0, aSite);
if (rv == NS_ERROR_HOST_IS_IP_ADDRESS ||
rv == NS_ERROR_INSUFFICIENT_DOMAIN_LEVELS) {
rv = nsContentUtils::GetHostOrIPv6WithBrackets(aURI, aSite);
}
return rv;
}
// External function for dealing with URIs to get site correctly.
// Calls through to GetSchemelessSite(), and serializes with the scheme and
// "://" prepended.
NS_IMETHODIMP
nsEffectiveTLDService::GetSite(nsIURI* aURI, nsACString& aSite) {
NS_ENSURE_ARG_POINTER(aURI);
nsAutoCString scheme;
nsresult rv = aURI->GetScheme(scheme);
NS_ENSURE_SUCCESS(rv, rv);
nsAutoCString schemeless;
rv = GetSchemelessSite(aURI, schemeless);
NS_ENSURE_SUCCESS(rv, rv);
// aURI (and thus BaseDomain) may be the string '.'. If so, fail.
if (schemeless.Length() == 1 && schemeless.Last() == '.') {
return NS_ERROR_INVALID_ARG;
}
// Reject any URIs without a host that aren't file:// URIs.
if (schemeless.IsEmpty() && !aURI->SchemeIs("file")) {
return NS_ERROR_INVALID_ARG;
}
aSite.SetCapacity(scheme.Length() + 3 + schemeless.Length());
aSite.Append(scheme);
aSite.Append("://"_ns);
aSite.Append(schemeless);
return NS_OK;
}
// External function for dealing with a host string directly: finds the public
// suffix (e.g. co.uk) for the given hostname. See GetBaseDomainInternal().
NS_IMETHODIMP
nsEffectiveTLDService::GetPublicSuffixFromHost(const nsACString& aHostname,
nsACString& aPublicSuffix) {
// Create a mutable copy of the hostname and normalize it to ACE.
// This will fail if the hostname includes invalid characters.
nsAutoCString normHostname(aHostname);
nsresult rv = NormalizeHostname(normHostname);
if (NS_FAILED(rv)) {
return rv;
}
return GetBaseDomainInternal(normHostname, 0, false, aPublicSuffix);
}
NS_IMETHODIMP
nsEffectiveTLDService::GetKnownPublicSuffixFromHost(const nsACString& aHostname,
nsACString& aPublicSuffix) {
// Create a mutable copy of the hostname and normalize it to ACE.
// This will fail if the hostname includes invalid characters.
nsAutoCString normHostname(aHostname);
nsresult rv = NormalizeHostname(normHostname);
if (NS_FAILED(rv)) {
return rv;
}
return GetBaseDomainInternal(normHostname, 0, true, aPublicSuffix);
}
// External function for dealing with a host string directly: finds the base
// domain (e.g. www.co.uk) for the given hostname and number of subdomain parts
// requested. See GetBaseDomainInternal().
NS_IMETHODIMP
nsEffectiveTLDService::GetBaseDomainFromHost(const nsACString& aHostname,
uint32_t aAdditionalParts,
nsACString& aBaseDomain) {
NS_ENSURE_TRUE(((int32_t)aAdditionalParts) >= 0, NS_ERROR_INVALID_ARG);
// Create a mutable copy of the hostname and normalize it to ACE.
// This will fail if the hostname includes invalid characters.
nsAutoCString normHostname(aHostname);
nsresult rv = NormalizeHostname(normHostname);
if (NS_FAILED(rv)) {
return rv;
}
return GetBaseDomainInternal(normHostname, aAdditionalParts + 1, false,
aBaseDomain);
}
NS_IMETHODIMP
nsEffectiveTLDService::GetNextSubDomain(const nsACString& aHostname,
nsACString& aBaseDomain) {
// Create a mutable copy of the hostname and normalize it to ACE.
// This will fail if the hostname includes invalid characters.
nsAutoCString normHostname(aHostname);
nsresult rv = NormalizeHostname(normHostname);
NS_ENSURE_SUCCESS(rv, rv);
return GetBaseDomainInternal(normHostname, -1, false, aBaseDomain);
}
// Finds the base domain for a host, with requested number of additional parts.
// This will fail, generating an error, if the host is an IPv4/IPv6 address,
// if more subdomain parts are requested than are available, or if the hostname
// includes characters that are not valid in a URL. Normalization is performed
// on the host string and the result will be in UTF8.
nsresult nsEffectiveTLDService::GetBaseDomainInternal(
nsCString& aHostname, int32_t aAdditionalParts, bool aOnlyKnownPublicSuffix,
nsACString& aBaseDomain) {
const int kExceptionRule = 1;
const int kWildcardRule = 2;
if (aHostname.IsEmpty()) {
return NS_ERROR_INSUFFICIENT_DOMAIN_LEVELS;
}
// chomp any trailing dot, and keep track of it for later
bool trailingDot = aHostname.Last() == '.';
if (trailingDot) {
aHostname.Truncate(aHostname.Length() - 1);
}
// check the edge cases of the host being '.' or having a second trailing '.',
// since subsequent checks won't catch it.
if (aHostname.IsEmpty() || aHostname.Last() == '.') {
return NS_ERROR_INVALID_ARG;
}
// Lookup in the cache if this is a normal query. This is restricted to
// main thread-only as the cache is not thread-safe.
Maybe<TldCache::Entry> entry;
if (aAdditionalParts == 1 && NS_IsMainThread()) {
auto p = mMruTable.Lookup(aHostname);
if (p) {
if (NS_FAILED(p.Data().mResult)) {
return p.Data().mResult;
}
// There was a match, just return the cached value.
aBaseDomain = p.Data().mBaseDomain;
if (trailingDot) {
aBaseDomain.Append('.');
}
return NS_OK;
}
entry = Some(p);
}
// Check if we're dealing with an IPv4/IPv6 hostname, and return
if (mozilla::net::HostIsIPLiteral(aHostname)) {
// Update the MRU table if in use.
if (entry) {
entry->Set(TLDCacheEntry{aHostname, ""_ns, NS_ERROR_HOST_IS_IP_ADDRESS});
}
return NS_ERROR_HOST_IS_IP_ADDRESS;
}
// Walk up the domain tree, most specific to least specific,
// looking for matches at each level. Note that a given level may
// have multiple attributes (e.g. IsWild() and IsNormal()).
const char* prevDomain = nullptr;
const char* currDomain = aHostname.get();
const char* nextDot = strchr(currDomain, '.');
const char* end = currDomain + aHostname.Length();
// Default value of *eTLD is currDomain as set in the while loop below
const char* eTLD = nullptr;
bool hasKnownPublicSuffix = false;
while (true) {
// sanity check the string we're about to look up: it should not begin
// with a '.'; this would mean the hostname began with a '.' or had an
// embedded '..' sequence.
if (*currDomain == '.') {
// Update the MRU table if in use.
if (entry) {
entry->Set(TLDCacheEntry{aHostname, ""_ns, NS_ERROR_INVALID_ARG});
}
return NS_ERROR_INVALID_ARG;
}
int result;
{
AutoReadLock lock(mGraphLock);
// Perform the lookup.
result = mGraph->Lookup(Substring(currDomain, end));
}
if (result != Dafsa::kKeyNotFound) {
hasKnownPublicSuffix = true;
if (result == kWildcardRule && prevDomain) {
// wildcard rules imply an eTLD one level inferior to the match.
eTLD = prevDomain;
break;
}
if (result != kExceptionRule || !nextDot) {
// specific match, or we've hit the top domain level
eTLD = currDomain;
break;
}
if (result == kExceptionRule) {
// exception rules imply an eTLD one level superior to the match.
eTLD = nextDot + 1;
break;
}
}
if (!nextDot) {
// we've hit the top domain level; use it by default.
eTLD = currDomain;
break;
}
prevDomain = currDomain;
currDomain = nextDot + 1;
nextDot = strchr(currDomain, '.');
}
if (aOnlyKnownPublicSuffix && !hasKnownPublicSuffix) {
aBaseDomain.Truncate();
return NS_OK;
}
const char *begin, *iter;
if (aAdditionalParts < 0) {
NS_ASSERTION(aAdditionalParts == -1,
"aAdditionalParts can't be negative and different from -1");
for (iter = aHostname.get(); iter != eTLD && *iter != '.'; iter++) {
;
}
if (iter != eTLD) {
iter++;
}
if (iter != eTLD) {
aAdditionalParts = 0;
}
} else {
// count off the number of requested domains.
begin = aHostname.get();
iter = eTLD;
while (true) {
if (iter == begin) {
break;
}
if (*(--iter) == '.' && aAdditionalParts-- == 0) {
++iter;
++aAdditionalParts;
break;
}
}
}
if (aAdditionalParts != 0) {
// Update the MRU table if in use.
if (entry) {
entry->Set(
TLDCacheEntry{aHostname, ""_ns, NS_ERROR_INSUFFICIENT_DOMAIN_LEVELS});
}
return NS_ERROR_INSUFFICIENT_DOMAIN_LEVELS;
}
aBaseDomain = Substring(iter, end);
// Update the MRU table if in use.
if (entry) {
entry->Set(TLDCacheEntry{aHostname, nsCString(aBaseDomain), NS_OK});
}
// add on the trailing dot, if applicable
if (trailingDot) {
aBaseDomain.Append('.');
}
return NS_OK;
}
// Normalizes the given hostname, component by component. ASCII/ACE
// components are lower-cased, and UTF-8 components are normalized per
// RFC 3454 and converted to ACE.
nsresult nsEffectiveTLDService::NormalizeHostname(nsCString& aHostname) {
if (!IsAscii(aHostname)) {
nsresult rv = mIDNService->ConvertUTF8toACE(aHostname, aHostname);
if (NS_FAILED(rv)) {
return rv;
}
}
ToLowerCase(aHostname);
return NS_OK;
}
NS_IMETHODIMP
nsEffectiveTLDService::HasRootDomain(const nsACString& aInput,
const nsACString& aHost, bool* aResult) {
return NS_HasRootDomain(aInput, aHost, aResult);
}