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parameters.go
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parameters.go
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/*
* Copyright (c) 2018, Psiphon Inc.
* All rights reserved.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
/*
Package parameters implements dynamic, concurrency-safe parameters that
determine Psiphon client and server behaviors.
Parameters include network timeouts, probabilities for actions, lists of
protocols, etc. Parameters are initialized with reasonable defaults. New
values may be applied, allowing the client or server to customize its
parameters from both a config file and tactics data. Sane minimum values are
enforced.
Parameters may be read and updated concurrently. The read mechanism offers a
snapshot so that related parameters, such as two Ints representing a range; or
a more complex series of related parameters; may be read in an atomic and
consistent way. For example:
p := params.Get()
min := p.Int("Min")
max := p.Int("Max")
p = nil
For long-running operations, it is recommended to set any pointer to the
snapshot to nil to allow garbage collection of old snaphots in cases where the
parameters change.
In general, parameters should be read as close to the point of use as possible
to ensure that dynamic changes to the parameter values take effect.
For duration parameters, time.ParseDuration-compatible string values are
supported when applying new values. This allows specifying durations as, for
example, "100ms" or "24h".
Values read from the parameters are not deep copies and must be treated as
read-only.
*/
package parameters
import (
"encoding/json"
"net/http"
"reflect"
"sync/atomic"
"time"
"github.com/Psiphon-Labs/psiphon-tunnel-core/psiphon/common"
"github.com/Psiphon-Labs/psiphon-tunnel-core/psiphon/common/errors"
"github.com/Psiphon-Labs/psiphon-tunnel-core/psiphon/common/obfuscator"
"github.com/Psiphon-Labs/psiphon-tunnel-core/psiphon/common/prng"
"github.com/Psiphon-Labs/psiphon-tunnel-core/psiphon/common/protocol"
"golang.org/x/net/bpf"
)
const (
NetworkLatencyMultiplier = "NetworkLatencyMultiplier"
NetworkLatencyMultiplierMin = "NetworkLatencyMultiplierMin"
NetworkLatencyMultiplierMax = "NetworkLatencyMultiplierMax"
NetworkLatencyMultiplierLambda = "NetworkLatencyMultiplierLambda"
TacticsWaitPeriod = "TacticsWaitPeriod"
TacticsRetryPeriod = "TacticsRetryPeriod"
TacticsRetryPeriodJitter = "TacticsRetryPeriodJitter"
TacticsTimeout = "TacticsTimeout"
ConnectionWorkerPoolSize = "ConnectionWorkerPoolSize"
TunnelPoolSize = "TunnelPoolSize"
TunnelConnectTimeout = "TunnelConnectTimeout"
EstablishTunnelTimeout = "EstablishTunnelTimeout"
EstablishTunnelWorkTime = "EstablishTunnelWorkTime"
EstablishTunnelPausePeriod = "EstablishTunnelPausePeriod"
EstablishTunnelPausePeriodJitter = "EstablishTunnelPausePeriodJitter"
EstablishTunnelServerAffinityGracePeriod = "EstablishTunnelServerAffinityGracePeriod"
StaggerConnectionWorkersPeriod = "StaggerConnectionWorkersPeriod"
StaggerConnectionWorkersJitter = "StaggerConnectionWorkersJitter"
LimitIntensiveConnectionWorkers = "LimitIntensiveConnectionWorkers"
UpstreamProxyErrorMinWaitDuration = "UpstreamProxyErrorMinWaitDuration"
UpstreamProxyErrorMaxWaitDuration = "UpstreamProxyErrorMaxWaitDuration"
IgnoreHandshakeStatsRegexps = "IgnoreHandshakeStatsRegexps"
PrioritizeTunnelProtocolsProbability = "PrioritizeTunnelProtocolsProbability"
PrioritizeTunnelProtocols = "PrioritizeTunnelProtocols"
PrioritizeTunnelProtocolsCandidateCount = "PrioritizeTunnelProtocolsCandidateCount"
InitialLimitTunnelProtocolsProbability = "InitialLimitTunnelProtocolsProbability"
InitialLimitTunnelProtocols = "InitialLimitTunnelProtocols"
InitialLimitTunnelProtocolsCandidateCount = "InitialLimitTunnelProtocolsCandidateCount"
LimitTunnelProtocolsProbability = "LimitTunnelProtocolsProbability"
LimitTunnelProtocols = "LimitTunnelProtocols"
LimitTLSProfilesProbability = "LimitTLSProfilesProbability"
LimitTLSProfiles = "LimitTLSProfiles"
UseOnlyCustomTLSProfiles = "UseOnlyCustomTLSProfiles"
CustomTLSProfiles = "CustomTLSProfiles"
SelectRandomizedTLSProfileProbability = "SelectRandomizedTLSProfileProbability"
NoDefaultTLSSessionIDProbability = "NoDefaultTLSSessionIDProbability"
DisableFrontingProviderTLSProfiles = "DisableFrontingProviderTLSProfiles"
LimitQUICVersionsProbability = "LimitQUICVersionsProbability"
LimitQUICVersions = "LimitQUICVersions"
DisableFrontingProviderQUICVersions = "DisableFrontingProviderQUICVersions"
FragmentorProbability = "FragmentorProbability"
FragmentorLimitProtocols = "FragmentorLimitProtocols"
FragmentorMinTotalBytes = "FragmentorMinTotalBytes"
FragmentorMaxTotalBytes = "FragmentorMaxTotalBytes"
FragmentorMinWriteBytes = "FragmentorMinWriteBytes"
FragmentorMaxWriteBytes = "FragmentorMaxWriteBytes"
FragmentorMinDelay = "FragmentorMinDelay"
FragmentorMaxDelay = "FragmentorMaxDelay"
FragmentorDownstreamProbability = "FragmentorDownstreamProbability"
FragmentorDownstreamLimitProtocols = "FragmentorDownstreamLimitProtocols"
FragmentorDownstreamMinTotalBytes = "FragmentorDownstreamMinTotalBytes"
FragmentorDownstreamMaxTotalBytes = "FragmentorDownstreamMaxTotalBytes"
FragmentorDownstreamMinWriteBytes = "FragmentorDownstreamMinWriteBytes"
FragmentorDownstreamMaxWriteBytes = "FragmentorDownstreamMaxWriteBytes"
FragmentorDownstreamMinDelay = "FragmentorDownstreamMinDelay"
FragmentorDownstreamMaxDelay = "FragmentorDownstreamMaxDelay"
ObfuscatedSSHMinPadding = "ObfuscatedSSHMinPadding"
ObfuscatedSSHMaxPadding = "ObfuscatedSSHMaxPadding"
TunnelOperateShutdownTimeout = "TunnelOperateShutdownTimeout"
TunnelPortForwardDialTimeout = "TunnelPortForwardDialTimeout"
PacketTunnelReadTimeout = "PacketTunnelReadTimeout"
TunnelRateLimits = "TunnelRateLimits"
AdditionalCustomHeaders = "AdditionalCustomHeaders"
SpeedTestPaddingMinBytes = "SpeedTestPaddingMinBytes"
SpeedTestPaddingMaxBytes = "SpeedTestPaddingMaxBytes"
SpeedTestMaxSampleCount = "SpeedTestMaxSampleCount"
SSHKeepAliveSpeedTestSampleProbability = "SSHKeepAliveSpeedTestSampleProbability"
SSHKeepAlivePaddingMinBytes = "SSHKeepAlivePaddingMinBytes"
SSHKeepAlivePaddingMaxBytes = "SSHKeepAlivePaddingMaxBytes"
SSHKeepAlivePeriodMin = "SSHKeepAlivePeriodMin"
SSHKeepAlivePeriodMax = "SSHKeepAlivePeriodMax"
SSHKeepAlivePeriodicTimeout = "SSHKeepAlivePeriodicTimeout"
SSHKeepAlivePeriodicInactivePeriod = "SSHKeepAlivePeriodicInactivePeriod"
SSHKeepAliveProbeTimeout = "SSHKeepAliveProbeTimeout"
SSHKeepAliveProbeInactivePeriod = "SSHKeepAliveProbeInactivePeriod"
SSHKeepAliveNetworkConnectivityPollingPeriod = "SSHKeepAliveNetworkConnectivityPollingPeriod"
SSHKeepAliveResetOnFailureProbability = "SSHKeepAliveResetOnFailureProbability"
HTTPProxyOriginServerTimeout = "HTTPProxyOriginServerTimeout"
HTTPProxyMaxIdleConnectionsPerHost = "HTTPProxyMaxIdleConnectionsPerHost"
FetchRemoteServerListTimeout = "FetchRemoteServerListTimeout"
FetchRemoteServerListRetryPeriod = "FetchRemoteServerListRetryPeriod"
FetchRemoteServerListStalePeriod = "FetchRemoteServerListStalePeriod"
RemoteServerListSignaturePublicKey = "RemoteServerListSignaturePublicKey"
RemoteServerListURLs = "RemoteServerListURLs"
ObfuscatedServerListRootURLs = "ObfuscatedServerListRootURLs"
PsiphonAPIRequestTimeout = "PsiphonAPIRequestTimeout"
PsiphonAPIStatusRequestPeriodMin = "PsiphonAPIStatusRequestPeriodMin"
PsiphonAPIStatusRequestPeriodMax = "PsiphonAPIStatusRequestPeriodMax"
PsiphonAPIStatusRequestShortPeriodMin = "PsiphonAPIStatusRequestShortPeriodMin"
PsiphonAPIStatusRequestShortPeriodMax = "PsiphonAPIStatusRequestShortPeriodMax"
PsiphonAPIStatusRequestPaddingMinBytes = "PsiphonAPIStatusRequestPaddingMinBytes"
PsiphonAPIStatusRequestPaddingMaxBytes = "PsiphonAPIStatusRequestPaddingMaxBytes"
PsiphonAPIPersistentStatsMaxCount = "PsiphonAPIPersistentStatsMaxCount"
PsiphonAPIConnectedRequestPeriod = "PsiphonAPIConnectedRequestPeriod"
PsiphonAPIConnectedRequestRetryPeriod = "PsiphonAPIConnectedRequestRetryPeriod"
FetchSplitTunnelRoutesTimeout = "FetchSplitTunnelRoutesTimeout"
SplitTunnelRoutesURLFormat = "SplitTunnelRoutesURLFormat"
SplitTunnelRoutesSignaturePublicKey = "SplitTunnelRoutesSignaturePublicKey"
SplitTunnelDNSServer = "SplitTunnelDNSServer"
FetchUpgradeTimeout = "FetchUpgradeTimeout"
FetchUpgradeRetryPeriod = "FetchUpgradeRetryPeriod"
FetchUpgradeStalePeriod = "FetchUpgradeStalePeriod"
UpgradeDownloadURLs = "UpgradeDownloadURLs"
UpgradeDownloadClientVersionHeader = "UpgradeDownloadClientVersionHeader"
TotalBytesTransferredNoticePeriod = "TotalBytesTransferredNoticePeriod"
TotalBytesTransferredEmitMemoryMetrics = "TotalBytesTransferredEmitMemoryMetrics"
MeekDialDomainsOnly = "MeekDialDomainsOnly"
MeekLimitBufferSizes = "MeekLimitBufferSizes"
MeekCookieMaxPadding = "MeekCookieMaxPadding"
MeekFullReceiveBufferLength = "MeekFullReceiveBufferLength"
MeekReadPayloadChunkLength = "MeekReadPayloadChunkLength"
MeekLimitedFullReceiveBufferLength = "MeekLimitedFullReceiveBufferLength"
MeekLimitedReadPayloadChunkLength = "MeekLimitedReadPayloadChunkLength"
MeekMinPollInterval = "MeekMinPollInterval"
MeekMinPollIntervalJitter = "MeekMinPollIntervalJitter"
MeekMaxPollInterval = "MeekMaxPollInterval"
MeekMaxPollIntervalJitter = "MeekMaxPollIntervalJitter"
MeekPollIntervalMultiplier = "MeekPollIntervalMultiplier"
MeekPollIntervalJitter = "MeekPollIntervalJitter"
MeekApplyPollIntervalMultiplierProbability = "MeekApplyPollIntervalMultiplierProbability"
MeekRoundTripRetryDeadline = "MeekRoundTripRetryDeadline"
MeekRoundTripRetryMinDelay = "MeekRoundTripRetryMinDelay"
MeekRoundTripRetryMaxDelay = "MeekRoundTripRetryMaxDelay"
MeekRoundTripRetryMultiplier = "MeekRoundTripRetryMultiplier"
MeekRoundTripTimeout = "MeekRoundTripTimeout"
MeekTrafficShapingProbability = "MeekTrafficShapingProbability"
MeekTrafficShapingLimitProtocols = "MeekTrafficShapingLimitProtocols"
MeekMinTLSPadding = "MeekMinTLSPadding"
MeekMaxTLSPadding = "MeekMaxTLSPadding"
MeekMinLimitRequestPayloadLength = "MeekMinLimitRequestPayloadLength"
MeekMaxLimitRequestPayloadLength = "MeekMaxLimitRequestPayloadLength"
MeekRedialTLSProbability = "MeekRedialTLSProbability"
TransformHostNameProbability = "TransformHostNameProbability"
PickUserAgentProbability = "PickUserAgentProbability"
LivenessTestMinUpstreamBytes = "LivenessTestMinUpstreamBytes"
LivenessTestMaxUpstreamBytes = "LivenessTestMaxUpstreamBytes"
LivenessTestMinDownstreamBytes = "LivenessTestMinDownstreamBytes"
LivenessTestMaxDownstreamBytes = "LivenessTestMaxDownstreamBytes"
ReplayCandidateCount = "ReplayCandidateCount"
ReplayDialParametersTTL = "ReplayDialParametersTTL"
ReplayTargetUpstreamBytes = "ReplayTargetUpstreamBytes"
ReplayTargetDownstreamBytes = "ReplayTargetDownstreamBytes"
ReplayTargetTunnelDuration = "ReplayTargetTunnelDuration"
ReplayBPF = "ReplayBPF"
ReplaySSH = "ReplaySSH"
ReplayObfuscatorPadding = "ReplayObfuscatorPadding"
ReplayFragmentor = "ReplayFragmentor"
ReplayTLSProfile = "ReplayTLSProfile"
ReplayRandomizedTLSProfile = "ReplayRandomizedTLSProfile"
ReplayFronting = "ReplayFronting"
ReplayHostname = "ReplayHostname"
ReplayQUICVersion = "ReplayQUICVersion"
ReplayObfuscatedQUIC = "ReplayObfuscatedQUIC"
ReplayLivenessTest = "ReplayLivenessTest"
ReplayUserAgent = "ReplayUserAgent"
ReplayAPIRequestPadding = "ReplayAPIRequestPadding"
ReplayLaterRoundMoveToFrontProbability = "ReplayLaterRoundMoveToFrontProbability"
ReplayRetainFailedProbability = "ReplayRetainFailedProbability"
APIRequestUpstreamPaddingMinBytes = "APIRequestUpstreamPaddingMinBytes"
APIRequestUpstreamPaddingMaxBytes = "APIRequestUpstreamPaddingMaxBytes"
APIRequestDownstreamPaddingMinBytes = "APIRequestDownstreamPaddingMinBytes"
APIRequestDownstreamPaddingMaxBytes = "APIRequestDownstreamPaddingMaxBytes"
PersistentStatsMaxStoreRecords = "PersistentStatsMaxStoreRecords"
PersistentStatsMaxSendBytes = "PersistentStatsMaxSendBytes"
RecordRemoteServerListPersistentStatsProbability = "RecordRemoteServerListPersistentStatsProbability"
RecordFailedTunnelPersistentStatsProbability = "RecordFailedTunnelPersistentStatsProbability"
ServerEntryMinimumAgeForPruning = "ServerEntryMinimumAgeForPruning"
ApplicationParametersProbability = "ApplicationParametersProbability"
ApplicationParameters = "ApplicationParameters"
BPFServerTCPProgram = "BPFServerTCPProgram"
BPFServerTCPProbability = "BPFServerTCPProbability"
BPFClientTCPProgram = "BPFClientTCPProgram"
BPFClientTCPProbability = "BPFClientTCPProbability"
ServerPacketManipulationSpecs = "ServerPacketManipulationSpecs"
ServerProtocolPacketManipulations = "ServerProtocolPacketManipulations"
ServerPacketManipulationProbability = "ServerPacketManipulationProbability"
FeedbackUploadURLs = "FeedbackUploadURLs"
FeedbackEncryptionPublicKey = "FeedbackEncryptionPublicKey"
FeedbackTacticsWaitPeriod = "FeedbackTacticsWaitPeriod"
FeedbackUploadMaxAttempts = "FeedbackUploadMaxAttempts"
FeedbackUploadRetryMinDelaySeconds = "FeedbackUploadRetryMinDelaySeconds"
FeedbackUploadRetryMaxDelaySeconds = "FeedbackUploadRetryMaxDelaySeconds"
FeedbackUploadTimeoutSeconds = "FeedbackUploadTimeoutSeconds"
ServerReplayPacketManipulation = "ServerReplayPacketManipulation"
ServerReplayFragmentor = "ServerReplayFragmentor"
ServerReplayUnknownGeoIP = "ServerReplayUnknownGeoIP"
ServerReplayTTL = "ServerReplayTTL"
ServerReplayTargetWaitDuration = "ServerReplayTargetWaitDuration"
ServerReplayTargetTunnelDuration = "ServerReplayTargetTunnelDuration"
ServerReplayTargetUpstreamBytes = "ServerReplayTargetUpstreamBytes"
ServerReplayTargetDownstreamBytes = "ServerReplayTargetDownstreamBytes"
ServerReplayFailedCountThreshold = "ServerReplayFailedCountThreshold"
ServerBurstUpstreamDeadline = "ServerBurstUpstreamDeadline"
ServerBurstUpstreamTargetBytes = "ServerBurstUpstreamTargetBytes"
ServerBurstDownstreamDeadline = "ServerBurstDownstreamDeadline"
ServerBurstDownstreamTargetBytes = "ServerBurstDownstreamTargetBytes"
ClientBurstUpstreamDeadline = "ClientBurstUpstreamDeadline"
ClientBurstUpstreamTargetBytes = "ClientBurstUpstreamTargetBytes"
ClientBurstDownstreamDeadline = "ClientBurstDownstreamDeadline"
ClientBurstDownstreamTargetBytes = "ClientBurstDownstreamTargetBytes"
)
const (
useNetworkLatencyMultiplier = 1
serverSideOnly = 2
)
// defaultParameters specifies the type, default value, and minimum value for
// all dynamically configurable client and server parameters.
//
// Do not change the names or types of existing values, as that can break
// client logic or cause parameters to not be applied.
//
// Minimum values are a fail-safe for cases where lower values would break the
// client logic. For example, setting a ConnectionWorkerPoolSize of 0 would
// make the client never connect.
var defaultParameters = map[string]struct {
value interface{}
minimum interface{}
flags int32
}{
// NetworkLatencyMultiplier defaults to 0, meaning off. But when set, it
// must be a multiplier >= 1.
NetworkLatencyMultiplier: {value: 0.0, minimum: 1.0},
NetworkLatencyMultiplierMin: {value: 1.0, minimum: 1.0},
NetworkLatencyMultiplierMax: {value: 3.0, minimum: 1.0},
NetworkLatencyMultiplierLambda: {value: 2.0, minimum: 0.001},
TacticsWaitPeriod: {value: 10 * time.Second, minimum: 0 * time.Second, flags: useNetworkLatencyMultiplier},
TacticsRetryPeriod: {value: 5 * time.Second, minimum: 1 * time.Millisecond},
TacticsRetryPeriodJitter: {value: 0.3, minimum: 0.0},
TacticsTimeout: {value: 2 * time.Minute, minimum: 1 * time.Second, flags: useNetworkLatencyMultiplier},
ConnectionWorkerPoolSize: {value: 10, minimum: 1},
TunnelPoolSize: {value: 1, minimum: 1},
TunnelConnectTimeout: {value: 20 * time.Second, minimum: 1 * time.Second, flags: useNetworkLatencyMultiplier},
EstablishTunnelTimeout: {value: 300 * time.Second, minimum: time.Duration(0)},
EstablishTunnelWorkTime: {value: 60 * time.Second, minimum: 1 * time.Second},
EstablishTunnelPausePeriod: {value: 5 * time.Second, minimum: 1 * time.Millisecond},
EstablishTunnelPausePeriodJitter: {value: 0.1, minimum: 0.0},
EstablishTunnelServerAffinityGracePeriod: {value: 1 * time.Second, minimum: time.Duration(0), flags: useNetworkLatencyMultiplier},
StaggerConnectionWorkersPeriod: {value: time.Duration(0), minimum: time.Duration(0)},
StaggerConnectionWorkersJitter: {value: 0.1, minimum: 0.0},
LimitIntensiveConnectionWorkers: {value: 0, minimum: 0},
UpstreamProxyErrorMinWaitDuration: {value: 10 * time.Second, minimum: time.Duration(0)},
UpstreamProxyErrorMaxWaitDuration: {value: 30 * time.Second, minimum: time.Duration(0)},
IgnoreHandshakeStatsRegexps: {value: false},
TunnelOperateShutdownTimeout: {value: 1 * time.Second, minimum: 1 * time.Millisecond, flags: useNetworkLatencyMultiplier},
TunnelPortForwardDialTimeout: {value: 10 * time.Second, minimum: 1 * time.Millisecond, flags: useNetworkLatencyMultiplier},
PacketTunnelReadTimeout: {value: 10 * time.Second, minimum: 1 * time.Millisecond, flags: useNetworkLatencyMultiplier},
TunnelRateLimits: {value: common.RateLimits{}},
// PrioritizeTunnelProtocols parameters are obsoleted by InitialLimitTunnelProtocols.
// TODO: remove once no longer required for older clients.
PrioritizeTunnelProtocolsProbability: {value: 1.0, minimum: 0.0},
PrioritizeTunnelProtocols: {value: protocol.TunnelProtocols{}},
PrioritizeTunnelProtocolsCandidateCount: {value: 10, minimum: 0},
InitialLimitTunnelProtocolsProbability: {value: 1.0, minimum: 0.0},
InitialLimitTunnelProtocols: {value: protocol.TunnelProtocols{}},
InitialLimitTunnelProtocolsCandidateCount: {value: 0, minimum: 0},
LimitTunnelProtocolsProbability: {value: 1.0, minimum: 0.0},
LimitTunnelProtocols: {value: protocol.TunnelProtocols{}},
LimitTLSProfilesProbability: {value: 1.0, minimum: 0.0},
LimitTLSProfiles: {value: protocol.TLSProfiles{}},
UseOnlyCustomTLSProfiles: {value: false},
CustomTLSProfiles: {value: protocol.CustomTLSProfiles{}},
SelectRandomizedTLSProfileProbability: {value: 0.25, minimum: 0.0},
NoDefaultTLSSessionIDProbability: {value: 0.5, minimum: 0.0},
DisableFrontingProviderTLSProfiles: {value: protocol.LabeledTLSProfiles{}},
LimitQUICVersionsProbability: {value: 1.0, minimum: 0.0},
LimitQUICVersions: {value: protocol.QUICVersions{}},
DisableFrontingProviderQUICVersions: {value: protocol.LabeledQUICVersions{}},
FragmentorProbability: {value: 0.5, minimum: 0.0},
FragmentorLimitProtocols: {value: protocol.TunnelProtocols{}},
FragmentorMinTotalBytes: {value: 0, minimum: 0},
FragmentorMaxTotalBytes: {value: 0, minimum: 0},
FragmentorMinWriteBytes: {value: 1, minimum: 1},
FragmentorMaxWriteBytes: {value: 1500, minimum: 1},
FragmentorMinDelay: {value: time.Duration(0), minimum: time.Duration(0)},
FragmentorMaxDelay: {value: 10 * time.Millisecond, minimum: time.Duration(0)},
FragmentorDownstreamProbability: {value: 0.5, minimum: 0.0, flags: serverSideOnly},
FragmentorDownstreamLimitProtocols: {value: protocol.TunnelProtocols{}, flags: serverSideOnly},
FragmentorDownstreamMinTotalBytes: {value: 0, minimum: 0, flags: serverSideOnly},
FragmentorDownstreamMaxTotalBytes: {value: 0, minimum: 0, flags: serverSideOnly},
FragmentorDownstreamMinWriteBytes: {value: 1, minimum: 1, flags: serverSideOnly},
FragmentorDownstreamMaxWriteBytes: {value: 1500, minimum: 1, flags: serverSideOnly},
FragmentorDownstreamMinDelay: {value: time.Duration(0), minimum: time.Duration(0), flags: serverSideOnly},
FragmentorDownstreamMaxDelay: {value: 10 * time.Millisecond, minimum: time.Duration(0), flags: serverSideOnly},
// The Psiphon server will reject obfuscated SSH seed messages with
// padding greater than OBFUSCATE_MAX_PADDING.
// obfuscator.NewClientObfuscator will ignore invalid min/max padding
// configurations.
ObfuscatedSSHMinPadding: {value: 0, minimum: 0},
ObfuscatedSSHMaxPadding: {value: obfuscator.OBFUSCATE_MAX_PADDING, minimum: 0},
AdditionalCustomHeaders: {value: make(http.Header)},
// Speed test and SSH keep alive padding is intended to frustrate
// fingerprinting and should not exceed ~1 IP packet size.
//
// Currently, each serialized speed test sample, populated with real
// values, is approximately 100 bytes. All SpeedTestMaxSampleCount samples
// are loaded into memory are sent as API inputs.
SpeedTestPaddingMinBytes: {value: 0, minimum: 0},
SpeedTestPaddingMaxBytes: {value: 256, minimum: 0},
SpeedTestMaxSampleCount: {value: 25, minimum: 1},
// The Psiphon server times out inactive tunnels after 5 minutes, so this
// is a soft max for SSHKeepAlivePeriodMax.
SSHKeepAliveSpeedTestSampleProbability: {value: 0.5, minimum: 0.0},
SSHKeepAlivePaddingMinBytes: {value: 0, minimum: 0},
SSHKeepAlivePaddingMaxBytes: {value: 256, minimum: 0},
SSHKeepAlivePeriodMin: {value: 1 * time.Minute, minimum: 1 * time.Second},
SSHKeepAlivePeriodMax: {value: 2 * time.Minute, minimum: 1 * time.Second},
SSHKeepAlivePeriodicTimeout: {value: 30 * time.Second, minimum: 1 * time.Second, flags: useNetworkLatencyMultiplier},
SSHKeepAlivePeriodicInactivePeriod: {value: 10 * time.Second, minimum: 1 * time.Second},
SSHKeepAliveProbeTimeout: {value: 5 * time.Second, minimum: 1 * time.Second, flags: useNetworkLatencyMultiplier},
SSHKeepAliveProbeInactivePeriod: {value: 10 * time.Second, minimum: 1 * time.Second},
SSHKeepAliveNetworkConnectivityPollingPeriod: {value: 500 * time.Millisecond, minimum: 1 * time.Millisecond},
SSHKeepAliveResetOnFailureProbability: {value: 0.0, minimum: 0.0},
HTTPProxyOriginServerTimeout: {value: 15 * time.Second, minimum: time.Duration(0), flags: useNetworkLatencyMultiplier},
HTTPProxyMaxIdleConnectionsPerHost: {value: 50, minimum: 0},
FetchRemoteServerListTimeout: {value: 30 * time.Second, minimum: 1 * time.Second, flags: useNetworkLatencyMultiplier},
FetchRemoteServerListRetryPeriod: {value: 30 * time.Second, minimum: 1 * time.Millisecond},
FetchRemoteServerListStalePeriod: {value: 6 * time.Hour, minimum: 1 * time.Hour},
RemoteServerListSignaturePublicKey: {value: ""},
RemoteServerListURLs: {value: TransferURLs{}},
ObfuscatedServerListRootURLs: {value: TransferURLs{}},
PsiphonAPIRequestTimeout: {value: 20 * time.Second, minimum: 1 * time.Second, flags: useNetworkLatencyMultiplier},
PsiphonAPIStatusRequestPeriodMin: {value: 5 * time.Minute, minimum: 1 * time.Second},
PsiphonAPIStatusRequestPeriodMax: {value: 10 * time.Minute, minimum: 1 * time.Second},
PsiphonAPIStatusRequestShortPeriodMin: {value: 5 * time.Second, minimum: 1 * time.Second},
PsiphonAPIStatusRequestShortPeriodMax: {value: 10 * time.Second, minimum: 1 * time.Second},
// PsiphonAPIPersistentStatsMaxCount parameter is obsoleted by PersistentStatsMaxSendBytes.
// TODO: remove once no longer required for older clients.
PsiphonAPIPersistentStatsMaxCount: {value: 100, minimum: 1},
// PsiphonAPIStatusRequestPadding parameters are obsoleted by APIRequestUp/DownstreamPadding.
// TODO: remove once no longer required for older clients.
PsiphonAPIStatusRequestPaddingMinBytes: {value: 0, minimum: 0},
PsiphonAPIStatusRequestPaddingMaxBytes: {value: 256, minimum: 0},
PsiphonAPIConnectedRequestRetryPeriod: {value: 5 * time.Second, minimum: 1 * time.Millisecond},
FetchSplitTunnelRoutesTimeout: {value: 60 * time.Second, minimum: 1 * time.Second, flags: useNetworkLatencyMultiplier},
SplitTunnelRoutesURLFormat: {value: ""},
SplitTunnelRoutesSignaturePublicKey: {value: ""},
SplitTunnelDNSServer: {value: ""},
FetchUpgradeTimeout: {value: 60 * time.Second, minimum: 1 * time.Second, flags: useNetworkLatencyMultiplier},
FetchUpgradeRetryPeriod: {value: 30 * time.Second, minimum: 1 * time.Millisecond},
FetchUpgradeStalePeriod: {value: 6 * time.Hour, minimum: 1 * time.Hour},
UpgradeDownloadURLs: {value: TransferURLs{}},
UpgradeDownloadClientVersionHeader: {value: ""},
TotalBytesTransferredNoticePeriod: {value: 5 * time.Minute, minimum: 1 * time.Second},
TotalBytesTransferredEmitMemoryMetrics: {value: true},
// The meek server times out inactive sessions after 45 seconds, so this
// is a soft max for MeekMaxPollInterval, MeekRoundTripTimeout, and
// MeekRoundTripRetryDeadline.
//
// MeekCookieMaxPadding cannot exceed common.OBFUSCATE_SEED_LENGTH.
//
// MeekMinTLSPadding/MeekMinTLSPadding are subject to TLS server limitations.
//
// MeekMinLimitRequestPayloadLength/MeekMaxLimitRequestPayloadLength
// cannot exceed server.MEEK_MAX_REQUEST_PAYLOAD_LENGTH.
MeekDialDomainsOnly: {value: false},
MeekLimitBufferSizes: {value: false},
MeekCookieMaxPadding: {value: 256, minimum: 0},
MeekFullReceiveBufferLength: {value: 4194304, minimum: 1024},
MeekReadPayloadChunkLength: {value: 65536, minimum: 1024},
MeekLimitedFullReceiveBufferLength: {value: 131072, minimum: 1024},
MeekLimitedReadPayloadChunkLength: {value: 4096, minimum: 1024},
MeekMinPollInterval: {value: 100 * time.Millisecond, minimum: 1 * time.Millisecond},
MeekMinPollIntervalJitter: {value: 0.3, minimum: 0.0},
MeekMaxPollInterval: {value: 5 * time.Second, minimum: 1 * time.Millisecond},
MeekMaxPollIntervalJitter: {value: 0.1, minimum: 0.0},
MeekPollIntervalMultiplier: {value: 1.5, minimum: 0.0},
MeekPollIntervalJitter: {value: 0.1, minimum: 0.0},
MeekApplyPollIntervalMultiplierProbability: {value: 0.5},
MeekRoundTripRetryDeadline: {value: 5 * time.Second, minimum: 1 * time.Millisecond, flags: useNetworkLatencyMultiplier},
MeekRoundTripRetryMinDelay: {value: 50 * time.Millisecond, minimum: time.Duration(0)},
MeekRoundTripRetryMaxDelay: {value: 1 * time.Second, minimum: time.Duration(0)},
MeekRoundTripRetryMultiplier: {value: 2.0, minimum: 0.0},
MeekRoundTripTimeout: {value: 20 * time.Second, minimum: 1 * time.Second, flags: useNetworkLatencyMultiplier},
MeekTrafficShapingProbability: {value: 1.0, minimum: 0.0},
MeekTrafficShapingLimitProtocols: {value: protocol.TunnelProtocols{}},
MeekMinTLSPadding: {value: 0, minimum: 0},
MeekMaxTLSPadding: {value: 0, minimum: 0},
MeekMinLimitRequestPayloadLength: {value: 65536, minimum: 1},
MeekMaxLimitRequestPayloadLength: {value: 65536, minimum: 1},
MeekRedialTLSProbability: {value: 0.0, minimum: 0.0},
TransformHostNameProbability: {value: 0.5, minimum: 0.0},
PickUserAgentProbability: {value: 0.5, minimum: 0.0},
LivenessTestMinUpstreamBytes: {value: 0, minimum: 0},
LivenessTestMaxUpstreamBytes: {value: 0, minimum: 0},
LivenessTestMinDownstreamBytes: {value: 0, minimum: 0},
LivenessTestMaxDownstreamBytes: {value: 0, minimum: 0},
ReplayCandidateCount: {value: 10, minimum: -1},
ReplayDialParametersTTL: {value: 24 * time.Hour, minimum: time.Duration(0)},
ReplayTargetUpstreamBytes: {value: 0, minimum: 0},
ReplayTargetDownstreamBytes: {value: 0, minimum: 0},
ReplayTargetTunnelDuration: {value: 1 * time.Second, minimum: time.Duration(0)},
ReplayBPF: {value: true},
ReplaySSH: {value: true},
ReplayObfuscatorPadding: {value: true},
ReplayFragmentor: {value: true},
ReplayTLSProfile: {value: true},
ReplayRandomizedTLSProfile: {value: true},
ReplayFronting: {value: true},
ReplayHostname: {value: true},
ReplayQUICVersion: {value: true},
ReplayObfuscatedQUIC: {value: true},
ReplayLivenessTest: {value: true},
ReplayUserAgent: {value: true},
ReplayAPIRequestPadding: {value: true},
ReplayLaterRoundMoveToFrontProbability: {value: 0.0, minimum: 0.0},
ReplayRetainFailedProbability: {value: 0.5, minimum: 0.0},
APIRequestUpstreamPaddingMinBytes: {value: 0, minimum: 0},
APIRequestUpstreamPaddingMaxBytes: {value: 1024, minimum: 0},
APIRequestDownstreamPaddingMinBytes: {value: 0, minimum: 0},
APIRequestDownstreamPaddingMaxBytes: {value: 1024, minimum: 0},
PersistentStatsMaxStoreRecords: {value: 200, minimum: 1},
PersistentStatsMaxSendBytes: {value: 65536, minimum: 1},
RecordRemoteServerListPersistentStatsProbability: {value: 1.0, minimum: 0.0},
RecordFailedTunnelPersistentStatsProbability: {value: 0.0, minimum: 0.0},
ServerEntryMinimumAgeForPruning: {value: 7 * 24 * time.Hour, minimum: 24 * time.Hour},
ApplicationParametersProbability: {value: 1.0, minimum: 0.0},
ApplicationParameters: {value: KeyValues{}},
BPFServerTCPProgram: {value: (*BPFProgramSpec)(nil), flags: serverSideOnly},
BPFServerTCPProbability: {value: 0.5, minimum: 0.0, flags: serverSideOnly},
BPFClientTCPProgram: {value: (*BPFProgramSpec)(nil)},
BPFClientTCPProbability: {value: 0.5, minimum: 0.0},
ServerPacketManipulationSpecs: {value: PacketManipulationSpecs{}, flags: serverSideOnly},
ServerProtocolPacketManipulations: {value: make(ProtocolPacketManipulations), flags: serverSideOnly},
ServerPacketManipulationProbability: {value: 0.5, minimum: 0.0, flags: serverSideOnly},
FeedbackUploadURLs: {value: TransferURLs{}},
FeedbackEncryptionPublicKey: {value: ""},
FeedbackTacticsWaitPeriod: {value: 5 * time.Second, minimum: 0 * time.Second, flags: useNetworkLatencyMultiplier},
FeedbackUploadMaxAttempts: {value: 5, minimum: 0},
FeedbackUploadRetryMinDelaySeconds: {value: 1 * time.Minute, minimum: time.Duration(0), flags: useNetworkLatencyMultiplier},
FeedbackUploadRetryMaxDelaySeconds: {value: 5 * time.Minute, minimum: 1 * time.Second, flags: useNetworkLatencyMultiplier},
FeedbackUploadTimeoutSeconds: {value: 30 * time.Second, minimum: 0 * time.Second, flags: useNetworkLatencyMultiplier},
ServerReplayPacketManipulation: {value: true, flags: serverSideOnly},
ServerReplayFragmentor: {value: true, flags: serverSideOnly},
ServerReplayUnknownGeoIP: {value: false, flags: serverSideOnly},
ServerReplayTTL: {value: time.Duration(0), minimum: time.Duration(0), flags: serverSideOnly},
ServerReplayTargetWaitDuration: {value: time.Duration(0), minimum: time.Duration(0), flags: serverSideOnly},
ServerReplayTargetTunnelDuration: {value: time.Duration(0), minimum: time.Duration(0), flags: serverSideOnly},
ServerReplayTargetUpstreamBytes: {value: 0, minimum: 0, flags: serverSideOnly},
ServerReplayTargetDownstreamBytes: {value: 0, minimum: 0, flags: serverSideOnly},
ServerReplayFailedCountThreshold: {value: 0, minimum: 0, flags: serverSideOnly},
ServerBurstUpstreamTargetBytes: {value: 0, minimum: 0, flags: serverSideOnly},
ServerBurstUpstreamDeadline: {value: time.Duration(0), minimum: time.Duration(0), flags: serverSideOnly},
ServerBurstDownstreamTargetBytes: {value: 0, minimum: 0, flags: serverSideOnly},
ServerBurstDownstreamDeadline: {value: time.Duration(0), minimum: time.Duration(0), flags: serverSideOnly},
ClientBurstUpstreamTargetBytes: {value: 0, minimum: 0},
ClientBurstUpstreamDeadline: {value: time.Duration(0), minimum: time.Duration(0)},
ClientBurstDownstreamTargetBytes: {value: 0, minimum: 0},
ClientBurstDownstreamDeadline: {value: time.Duration(0), minimum: time.Duration(0)},
}
// IsServerSideOnly indicates if the parameter specified by name is used
// server-side only.
func IsServerSideOnly(name string) bool {
defaultParameter, ok := defaultParameters[name]
return ok && (defaultParameter.flags&serverSideOnly) != 0
}
// Parameters is a set of parameters. To use the parameters, call Get. To
// apply new values to the parameters, call Set.
type Parameters struct {
getValueLogger func(error)
snapshot atomic.Value
}
// NewParameters initializes a new Parameters with the default parameter
// values.
//
// getValueLogger is optional, and is used to report runtime errors with
// getValue; see comment in getValue.
func NewParameters(
getValueLogger func(error)) (*Parameters, error) {
parameters := &Parameters{
getValueLogger: getValueLogger,
}
_, err := parameters.Set("", false)
if err != nil {
return nil, errors.Trace(err)
}
return parameters, nil
}
func makeDefaultParameters() (map[string]interface{}, error) {
parameters := make(map[string]interface{})
for name, defaults := range defaultParameters {
if defaults.value == nil {
return nil, errors.Tracef("default parameter missing value: %s", name)
}
if defaults.minimum != nil &&
reflect.TypeOf(defaults.value) != reflect.TypeOf(defaults.minimum) {
return nil, errors.Tracef("default parameter value and minimum type mismatch: %s", name)
}
_, isDuration := defaults.value.(time.Duration)
if defaults.flags&useNetworkLatencyMultiplier != 0 && !isDuration {
return nil, errors.Tracef("default non-duration parameter uses multipler: %s", name)
}
parameters[name] = defaults.value
}
return parameters, nil
}
// Set replaces the current parameters. First, a set of parameters are
// initialized using the default values. Then, each applyParameters is applied
// in turn, with the later instances having precedence.
//
// When skipOnError is true, unknown or invalid parameters in any
// applyParameters are skipped instead of aborting with an error.
//
// For protocol.TunnelProtocols and protocol.TLSProfiles type values, when
// skipOnError is true the values are filtered instead of validated, so
// only known tunnel protocols and TLS profiles are retained.
//
// When an error is returned, the previous parameters remain completely
// unmodified.
//
// For use in logging, Set returns a count of the number of parameters applied
// from each applyParameters.
func (p *Parameters) Set(
tag string, skipOnError bool, applyParameters ...map[string]interface{}) ([]int, error) {
makeTypedValue := func(templateValue, value interface{}) (interface{}, error) {
// Accept strings such as "1h" for duration parameters.
switch templateValue.(type) {
case time.Duration:
if s, ok := value.(string); ok {
if d, err := time.ParseDuration(s); err == nil {
value = d
}
}
}
// A JSON remarshal resolves cases where applyParameters is a
// result of unmarshal-into-interface, in which case non-scalar
// values will not have the expected types; see:
// https://golang.org/pkg/encoding/json/#Unmarshal. This remarshal
// also results in a deep copy.
marshaledValue, err := json.Marshal(value)
if err != nil {
return nil, errors.Trace(err)
}
newValuePtr := reflect.New(reflect.TypeOf(templateValue))
err = json.Unmarshal(marshaledValue, newValuePtr.Interface())
if err != nil {
return nil, errors.Trace(err)
}
return newValuePtr.Elem().Interface(), nil
}
getAppliedValue := func(
name string,
parameters map[string]interface{},
applyParameters []map[string]interface{}) (interface{}, error) {
templateValue := parameters[name]
if templateValue == nil {
return nil, errors.Tracef("unknown parameter: %s", name)
}
value := templateValue
for i := len(applyParameters) - 1; i >= 0; i-- {
if v := applyParameters[i][name]; v != nil {
value = v
break
}
}
return makeTypedValue(templateValue, value)
}
var counts []int
parameters, err := makeDefaultParameters()
if err != nil {
return nil, errors.Trace(err)
}
// Special case: TLSProfiles/LabeledTLSProfiles may reference
// CustomTLSProfiles names. Inspect the CustomTLSProfiles parameter and
// extract its names. Do not call Get().CustomTLSProfilesNames() as
// CustomTLSProfiles may not yet be validated.
customTLSProfilesValue, err := getAppliedValue(
CustomTLSProfiles, parameters, applyParameters)
if err != nil {
return nil, errors.Trace(err)
}
customTLSProfiles, _ := customTLSProfilesValue.(protocol.CustomTLSProfiles)
customTLSProfileNames := make([]string, len(customTLSProfiles))
for i, profile := range customTLSProfiles {
customTLSProfileNames[i] = profile.Name
}
// Special case: PacketManipulations will reference PacketManipulationSpecs.
serverPacketManipulationSpecsValue, err := getAppliedValue(
ServerPacketManipulationSpecs, parameters, applyParameters)
if err != nil {
return nil, errors.Trace(err)
}
serverPacketManipulationSpecs, _ :=
serverPacketManipulationSpecsValue.(PacketManipulationSpecs)
for i := 0; i < len(applyParameters); i++ {
count := 0
for name, value := range applyParameters[i] {
templateValue, ok := parameters[name]
if !ok {
if skipOnError {
continue
}
return nil, errors.Tracef("unknown parameter: %s", name)
}
newValue, err := makeTypedValue(templateValue, value)
if err != nil {
if skipOnError {
continue
}
return nil, errors.Tracef(
"unmarshal parameter %s failed: %v", name, err)
}
// Perform type-specific validation for some cases.
// TODO: require RemoteServerListSignaturePublicKey when
// RemoteServerListURLs is set?
switch v := newValue.(type) {
case TransferURLs:
err := v.DecodeAndValidate()
if err != nil {
if skipOnError {
continue
}
return nil, errors.Trace(err)
}
case protocol.TunnelProtocols:
if skipOnError {
newValue = v.PruneInvalid()
} else {
err := v.Validate()
if err != nil {
return nil, errors.Trace(err)
}
}
case protocol.TLSProfiles:
if skipOnError {
newValue = v.PruneInvalid(customTLSProfileNames)
} else {
err := v.Validate(customTLSProfileNames)
if err != nil {
return nil, errors.Trace(err)
}
}
case protocol.LabeledTLSProfiles:
if skipOnError {
newValue = v.PruneInvalid(customTLSProfileNames)
} else {
err := v.Validate(customTLSProfileNames)
if err != nil {
return nil, errors.Trace(err)
}
}
case protocol.QUICVersions:
if skipOnError {
newValue = v.PruneInvalid()
} else {
err := v.Validate()
if err != nil {
return nil, errors.Trace(err)
}
}
case protocol.LabeledQUICVersions:
if skipOnError {
newValue = v.PruneInvalid()
} else {
err := v.Validate()
if err != nil {
return nil, errors.Trace(err)
}
}
case protocol.CustomTLSProfiles:
err := v.Validate()
if err != nil {
if skipOnError {
continue
}
return nil, errors.Trace(err)
}
case KeyValues:
err := v.Validate()
if err != nil {
if skipOnError {
continue
}
return nil, errors.Trace(err)
}
case *BPFProgramSpec:
if v != nil {
err := v.Validate()
if err != nil {
if skipOnError {
continue
}
return nil, errors.Trace(err)
}
}
case PacketManipulationSpecs:
err := v.Validate()
if err != nil {
if skipOnError {
continue
}
return nil, errors.Trace(err)
}
case ProtocolPacketManipulations:
var packetManipulationSpecs PacketManipulationSpecs
if name == ServerProtocolPacketManipulations {
packetManipulationSpecs = serverPacketManipulationSpecs
}
err := v.Validate(packetManipulationSpecs)
if err != nil {
if skipOnError {
continue
}
return nil, errors.Trace(err)
}
}
// Enforce any minimums. Assumes defaultParameters[name]
// exists.
if defaultParameters[name].minimum != nil {
valid := true
switch v := newValue.(type) {
case int:
m, ok := defaultParameters[name].minimum.(int)
if !ok || v < m {
valid = false
}
case float64:
m, ok := defaultParameters[name].minimum.(float64)
if !ok || v < m {
valid = false
}
case time.Duration:
m, ok := defaultParameters[name].minimum.(time.Duration)
if !ok || v < m {
valid = false
}
default:
if skipOnError {
continue
}
return nil, errors.Tracef("unexpected parameter with minimum: %s", name)
}
if !valid {
if skipOnError {
continue
}
return nil, errors.Tracef("parameter below minimum: %s", name)
}
}
parameters[name] = newValue
count++
}
counts = append(counts, count)
}
snapshot := ¶metersSnapshot{
getValueLogger: p.getValueLogger,
tag: tag,
parameters: parameters,
}
p.snapshot.Store(snapshot)
return counts, nil
}
// Get returns the current parameters.
//
// Values read from the current parameters are not deep copies and must be
// treated read-only.
//
// The returned ParametersAccessor may be used to read multiple related values
// atomically and consistently while the current set of values in Parameters
// may change concurrently.
//
// Get does not perform any heap allocations and is intended for repeated,
// direct, low-overhead invocations.
func (p *Parameters) Get() ParametersAccessor {
return ParametersAccessor{
snapshot: p.snapshot.Load().(*parametersSnapshot)}
}
// GetCustom returns the current parameters while also setting customizations
// for this instance.
//
// The properties of Get also apply to GetCustom: must be read-only; atomic
// and consisent view; no heap allocations.
//
// Customizations include:
//
// - customNetworkLatencyMultiplier, which overrides NetworkLatencyMultiplier
// for this instance only.
//
func (p *Parameters) GetCustom(
customNetworkLatencyMultiplier float64) ParametersAccessor {
return ParametersAccessor{
snapshot: p.snapshot.Load().(*parametersSnapshot),
customNetworkLatencyMultiplier: customNetworkLatencyMultiplier,
}
}
// parametersSnapshot is an atomic snapshot of the parameter values.
// Parameters.Get will return a snapshot which may be used to read multiple
// related values atomically and consistently while the current snapshot in
// Parameters may change concurrently.
type parametersSnapshot struct {
getValueLogger func(error)
tag string
parameters map[string]interface{}
}
// getValue sets target to the value of the named parameter.
//
// It is an error if the name is not found, target is not a pointer, or the
// type of target points to does not match the value.
//
// Any of these conditions would be a bug in the caller. getValue does not
// panic in these cases as clients are deployed as a library in various apps
// and the failure of Psiphon may not be a failure for the app process.
//
// Instead, errors are logged to the getValueLogger and getValue leaves the
// target unset, which will result in the caller getting and using a zero
// value of the requested type.
func (p *parametersSnapshot) getValue(name string, target interface{}) {
value, ok := p.parameters[name]
if !ok {
if p.getValueLogger != nil {
p.getValueLogger(errors.Tracef(
"value %s not found", name))
}
return
}
valueType := reflect.TypeOf(value)
if reflect.PtrTo(valueType) != reflect.TypeOf(target) {
if p.getValueLogger != nil {
p.getValueLogger(errors.Tracef(
"value %s has unexpected type %s", name, valueType.Name()))
}
return
}
// Note: there is no deep copy of parameter values; the returned value may
// share memory with the original and should not be modified.
targetValue := reflect.ValueOf(target)