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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/http/alternative_service.h"
#include "base/check_op.h"
#include "base/metrics/histogram_macros.h"
#include "base/metrics/histogram_macros_local.h"
#include "base/notreached.h"
#include "base/strings/stringprintf.h"
#include "net/base/port_util.h"
#include "net/third_party/quiche/src/quiche/quic/core/http/spdy_utils.h"
#include "net/third_party/quiche/src/quiche/quic/core/quic_versions.h"
namespace net {
void HistogramAlternateProtocolUsage(AlternateProtocolUsage usage,
bool is_google_host) {
UMA_HISTOGRAM_ENUMERATION("Net.AlternateProtocolUsage", usage,
ALTERNATE_PROTOCOL_USAGE_MAX);
if (is_google_host) {
UMA_HISTOGRAM_ENUMERATION("Net.AlternateProtocolUsageGoogle", usage,
ALTERNATE_PROTOCOL_USAGE_MAX);
}
}
void HistogramBrokenAlternateProtocolLocation(
BrokenAlternateProtocolLocation location) {
UMA_HISTOGRAM_ENUMERATION("Net.AlternateProtocolBrokenLocation", location,
BROKEN_ALTERNATE_PROTOCOL_LOCATION_MAX);
}
bool IsAlternateProtocolValid(NextProto protocol) {
switch (protocol) {
case NextProto::kProtoUnknown:
return false;
case NextProto::kProtoHTTP11:
return false;
case NextProto::kProtoHTTP2:
return true;
case NextProto::kProtoQUIC:
return true;
}
NOTREACHED();
}
bool IsProtocolEnabled(NextProto protocol,
bool is_http2_enabled,
bool is_quic_enabled) {
switch (protocol) {
case NextProto::kProtoUnknown:
NOTREACHED();
case NextProto::kProtoHTTP11:
return true;
case NextProto::kProtoHTTP2:
return is_http2_enabled;
case NextProto::kProtoQUIC:
return is_quic_enabled;
}
NOTREACHED();
}
AlternativeService::AlternativeService(NextProto protocol,
std::string_view host,
uint16_t port)
: protocol(protocol), host(host), port(port) {}
AlternativeService::AlternativeService(NextProto protocol,
const HostPortPair& host_port_pair)
: AlternativeService(protocol,
host_port_pair.host(),
host_port_pair.port()) {}
AlternativeService::AlternativeService(
const AlternativeService& alternative_service) = default;
AlternativeService::AlternativeService(AlternativeService&&) noexcept = default;
AlternativeService& AlternativeService::operator=(
const AlternativeService& alternative_service) = default;
AlternativeService& AlternativeService::operator=(AlternativeService&&) =
default;
HostPortPair AlternativeService::GetHostPortPair() const {
return HostPortPair(host, port);
}
std::strong_ordering AlternativeService::operator<=>(
const AlternativeService& other) const = default;
std::string AlternativeService::ToString() const {
return base::StringPrintf("%s %s:%d", NextProtoToString(protocol),
host.c_str(), port);
}
std::ostream& operator<<(std::ostream& os,
const AlternativeService& alternative_service) {
os << alternative_service.ToString();
return os;
}
// static
AlternativeServiceInfo
AlternativeServiceInfo::CreateHttp2AlternativeServiceInfo(
const AlternativeService& alternative_service,
base::Time expiration) {
DCHECK_EQ(alternative_service.protocol, NextProto::kProtoHTTP2);
return AlternativeServiceInfo(alternative_service, expiration,
quic::ParsedQuicVersionVector());
}
// static
AlternativeServiceInfo AlternativeServiceInfo::CreateQuicAlternativeServiceInfo(
const AlternativeService& alternative_service,
base::Time expiration,
const quic::ParsedQuicVersionVector& advertised_versions) {
DCHECK_EQ(alternative_service.protocol, NextProto::kProtoQUIC);
return AlternativeServiceInfo(alternative_service, expiration,
advertised_versions);
}
AlternativeServiceInfo::AlternativeServiceInfo() = default;
AlternativeServiceInfo::AlternativeServiceInfo(
const AlternativeServiceInfo& alternative_service_info) = default;
AlternativeServiceInfo::AlternativeServiceInfo(
AlternativeServiceInfo&&) noexcept = default;
AlternativeServiceInfo& AlternativeServiceInfo::operator=(
AlternativeServiceInfo&&) = default;
AlternativeServiceInfo& AlternativeServiceInfo::operator=(
const AlternativeServiceInfo& alternative_service_info) = default;
AlternativeServiceInfo::~AlternativeServiceInfo() = default;
bool AlternativeServiceInfo::operator==(
const AlternativeServiceInfo& other) const = default;
std::string AlternativeServiceInfo::ToString() const {
// NOTE: Cannot use `base::UnlocalizedTimeFormatWithPattern()` since
// `net/DEPS` disallows `base/i18n`.
base::Time::Exploded exploded;
expiration_.LocalExplode(&exploded);
return base::StringPrintf(
"%s, expires %04d-%02d-%02d %02d:%02d:%02d",
alternative_service_.ToString().c_str(), exploded.year, exploded.month,
exploded.day_of_month, exploded.hour, exploded.minute, exploded.second);
}
void AlternativeServiceInfo::SetAdvertisedVersions(
const quic::ParsedQuicVersionVector& advertised_versions) {
if (alternative_service_.protocol != NextProto::kProtoQUIC) {
return;
}
advertised_versions_ = advertised_versions;
std::ranges::sort(advertised_versions_, {},
&quic::ParsedQuicVersion::transport_version);
}
AlternativeServiceInfoVector ProcessAlternativeServices(
const spdy::SpdyAltSvcWireFormat::AlternativeServiceVector&
alternative_service_vector,
bool is_http2_enabled,
bool is_quic_enabled,
const quic::ParsedQuicVersionVector& supported_quic_versions) {
// Convert spdy::SpdyAltSvcWireFormat::AlternativeService entries
// to AlternativeServiceInfo.
AlternativeServiceInfoVector alternative_service_info_vector;
for (const spdy::SpdyAltSvcWireFormat::AlternativeService&
alternative_service_entry : alternative_service_vector) {
if (!IsPortValid(alternative_service_entry.port)) {
continue;
}
NextProto protocol =
NextProtoFromString(alternative_service_entry.protocol_id);
quic::ParsedQuicVersionVector advertised_versions;
if (protocol == NextProto::kProtoQUIC) {
continue; // Ignore legacy QUIC alt-svc advertisements.
} else if (!IsAlternateProtocolValid(protocol)) {
quic::ParsedQuicVersion version =
quic::SpdyUtils::ExtractQuicVersionFromAltSvcEntry(
alternative_service_entry, supported_quic_versions);
if (version == quic::ParsedQuicVersion::Unsupported()) {
continue;
}
protocol = NextProto::kProtoQUIC;
advertised_versions = {version};
}
if (!IsAlternateProtocolValid(protocol) ||
!IsProtocolEnabled(protocol, is_http2_enabled, is_quic_enabled)) {
continue;
}
AlternativeService alternative_service(protocol,
alternative_service_entry.host,
alternative_service_entry.port);
base::Time expiration =
base::Time::Now() +
base::Seconds(alternative_service_entry.max_age_seconds);
AlternativeServiceInfo alternative_service_info;
if (protocol == NextProto::kProtoQUIC) {
alternative_service_info =
AlternativeServiceInfo::CreateQuicAlternativeServiceInfo(
alternative_service, expiration, advertised_versions);
} else {
alternative_service_info =
AlternativeServiceInfo::CreateHttp2AlternativeServiceInfo(
alternative_service, expiration);
}
alternative_service_info_vector.push_back(alternative_service_info);
}
return alternative_service_info_vector;
}
AlternativeServiceInfo::AlternativeServiceInfo(
const AlternativeService& alternative_service,
base::Time expiration,
const quic::ParsedQuicVersionVector& advertised_versions)
: alternative_service_(alternative_service), expiration_(expiration) {
if (alternative_service_.protocol == NextProto::kProtoQUIC) {
advertised_versions_ = advertised_versions;
}
}
} // namespace net
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