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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// 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"
namespace net {
namespace {
enum AlternativeProxyUsage {
// Alternative Proxy was used without racing a normal connection.
ALTERNATIVE_PROXY_USAGE_NO_RACE = 0,
// Alternative Proxy was used by winning a race with a normal connection.
ALTERNATIVE_PROXY_USAGE_WON_RACE = 1,
// Alternative Proxy was not used by losing a race with a normal connection.
ALTERNATIVE_PROXY_USAGE_LOST_RACE = 2,
// Maximum value for the enum.
ALTERNATIVE_PROXY_USAGE_MAX,
};
AlternativeProxyUsage ConvertProtocolUsageToProxyUsage(
AlternateProtocolUsage usage) {
switch (usage) {
case ALTERNATE_PROTOCOL_USAGE_NO_RACE:
return ALTERNATIVE_PROXY_USAGE_NO_RACE;
case ALTERNATE_PROTOCOL_USAGE_WON_RACE:
return ALTERNATIVE_PROXY_USAGE_WON_RACE;
case ALTERNATE_PROTOCOL_USAGE_LOST_RACE:
return ALTERNATIVE_PROXY_USAGE_LOST_RACE;
default:
NOTREACHED();
return ALTERNATIVE_PROXY_USAGE_MAX;
}
}
quic::ParsedQuicVersion ParsedQuicVersionFromAlpn(
base::StringPiece str,
quic::ParsedQuicVersionVector supported_versions) {
for (const quic::ParsedQuicVersion& version : supported_versions) {
if (AlpnForVersion(version) == str)
return version;
}
return quic::ParsedQuicVersion::Unsupported();
}
} // anonymous namespace
void HistogramAlternateProtocolUsage(AlternateProtocolUsage usage,
bool proxy_server_used,
bool is_google_host) {
if (proxy_server_used) {
DCHECK_LE(usage, ALTERNATE_PROTOCOL_USAGE_LOST_RACE);
LOCAL_HISTOGRAM_ENUMERATION("Net.QuicAlternativeProxy.Usage",
ConvertProtocolUsageToProxyUsage(usage),
ALTERNATIVE_PROXY_USAGE_MAX);
} else {
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 kProtoUnknown:
return false;
case kProtoHTTP11:
return false;
case kProtoHTTP2:
return true;
case kProtoQUIC:
return true;
}
NOTREACHED();
return false;
}
bool IsProtocolEnabled(NextProto protocol,
bool is_http2_enabled,
bool is_quic_enabled) {
switch (protocol) {
case kProtoUnknown:
NOTREACHED();
return false;
case kProtoHTTP11:
return true;
case kProtoHTTP2:
return is_http2_enabled;
case kProtoQUIC:
return is_quic_enabled;
}
NOTREACHED();
return false;
}
// static
AlternativeServiceInfo
AlternativeServiceInfo::CreateHttp2AlternativeServiceInfo(
const AlternativeService& alternative_service,
base::Time expiration) {
DCHECK_EQ(alternative_service.protocol, 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, kProtoQUIC);
return AlternativeServiceInfo(alternative_service, expiration,
advertised_versions);
}
AlternativeServiceInfo::AlternativeServiceInfo() : alternative_service_() {}
AlternativeServiceInfo::~AlternativeServiceInfo() = default;
AlternativeServiceInfo::AlternativeServiceInfo(
const AlternativeService& alternative_service,
base::Time expiration,
const quic::ParsedQuicVersionVector& advertised_versions)
: alternative_service_(alternative_service), expiration_(expiration) {
if (alternative_service_.protocol == kProtoQUIC) {
advertised_versions_ = advertised_versions;
}
}
AlternativeServiceInfo::AlternativeServiceInfo(
const AlternativeServiceInfo& alternative_service_info) = default;
AlternativeServiceInfo& AlternativeServiceInfo::operator=(
const AlternativeServiceInfo& alternative_service_info) = default;
std::string AlternativeService::ToString() const {
return base::StringPrintf("%s %s:%d", NextProtoToString(protocol),
host.c_str(), port);
}
std::string AlternativeServiceInfo::ToString() const {
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);
}
// static
bool AlternativeServiceInfo::TransportVersionLessThan(
const quic::ParsedQuicVersion& lhs,
const quic::ParsedQuicVersion& rhs) {
return lhs.transport_version < rhs.transport_version;
}
std::ostream& operator<<(std::ostream& os,
const AlternativeService& alternative_service) {
os << alternative_service.ToString();
return os;
}
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 net::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);
// Check if QUIC version is supported. Filter supported QUIC versions.
quic::ParsedQuicVersionVector advertised_versions;
if (protocol == kProtoQUIC) {
if (!IsProtocolEnabled(protocol, is_http2_enabled, is_quic_enabled))
continue;
if (!alternative_service_entry.version.empty()) {
advertised_versions = FilterSupportedAltSvcVersions(
alternative_service_entry, supported_quic_versions);
if (advertised_versions.empty())
continue;
}
} else if (!IsAlternateProtocolValid(protocol)) {
quic::ParsedQuicVersion version = ParsedQuicVersionFromAlpn(
alternative_service_entry.protocol_id, supported_quic_versions);
if (version == quic::ParsedQuicVersion::Unsupported()) {
continue;
}
protocol = 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::TimeDelta::FromSeconds(alternative_service_entry.max_age);
AlternativeServiceInfo alternative_service_info;
if (protocol == 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;
}
} // namespace net
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