netmessages.proto

Protobufs / netmessages.proto

Core Source 2 network protocol messages exchanged between client and server. Includes server-info negotiation, entity delta updates, string tables, voice data, and game-event delivery. Client→Server messages use the CLC_ prefix; Server→Client use SVC_.

CS2 build 25218825 · Steam date 2026-09-09 · platform windows-x86_64 · schema format 2.2

Group: CS2 wire formatMessages: 63 top-level, 74 totalEnums: 11 top-level, 12 total

Imports: networkbasetypes.proto, source2_steam_stats.proto

Wire ids

Every message in this file that a wire-id enum constant maps to, by the join rule described on the Protobufs index.

Message	Enum constant	Value
CCLCMsg_ClientInfo	CLC_Messages.clc_ClientInfo	20
CCLCMsg_Move	CLC_Messages.clc_Move	21
CCLCMsg_VoiceData	CLC_Messages.clc_VoiceData	22
CCLCMsg_BaselineAck	CLC_Messages.clc_BaselineAck	23
CCLCMsg_RespondCvarValue	CLC_Messages.clc_RespondCvarValue	25
CCLCMsg_LoadingProgress	CLC_Messages.clc_LoadingProgress	27
CCLCMsg_SplitPlayerConnect	CLC_Messages.clc_SplitPlayerConnect	28
CCLCMsg_SplitPlayerDisconnect	CLC_Messages.clc_SplitPlayerDisconnect	30
CCLCMsg_ServerStatus	CLC_Messages.clc_ServerStatus	31
CCLCMsg_RequestPause	CLC_Messages.clc_RequestPause	33
CCLCMsg_CmdKeyValues	CLC_Messages.clc_CmdKeyValues	34
CCLCMsg_RconServerDetails	CLC_Messages.clc_RconServerDetails	35
CCLCMsg_Diagnostic	CLC_Messages.clc_Diagnostic	37
CSVCMsg_ServerInfo	SVC_Messages.svc_ServerInfo	40
CSVCMsg_ClassInfo	SVC_Messages.svc_ClassInfo	42
CSVCMsg_SetPause	SVC_Messages.svc_SetPause	43
CSVCMsg_VoiceInit	SVC_Messages.svc_VoiceInit	46
CSVCMsg_Print	SVC_Messages.svc_Print	48
CSVCMsg_Sounds	SVC_Messages.svc_Sounds	49
CSVCMsg_Prefetch	SVC_Messages.svc_Prefetch	56
CSVCMsg_SetView	SVC_Messages.svc_SetView	50
CSVCMsg_BSPDecal	SVC_Messages.svc_BSPDecal	53
CSVCMsg_SplitScreen	SVC_Messages.svc_SplitScreen	54
CSVCMsg_GetCvarValue	SVC_Messages.svc_GetCvarValue	58
CSVCMsg_Menu	SVC_Messages.svc_Menu	57
CSVCMsg_UserMessage	SVC_Messages.svc_UserMessage	72
CSVCMsg_PacketEntities	SVC_Messages.svc_PacketEntities	55
CSVCMsg_CreateStringTable	SVC_Messages.svc_CreateStringTable	44
CSVCMsg_UpdateStringTable	SVC_Messages.svc_UpdateStringTable	45
CSVCMsg_VoiceData	SVC_Messages.svc_VoiceData	47
CSVCMsg_PacketReliable	SVC_Messages.svc_PacketReliable	61
CSVCMsg_FullFrameSplit	SVC_Messages.svc_FullFrameSplit	70
CSVCMsg_HLTVStatus	SVC_Messages.svc_HLTVStatus	62
CSVCMsg_ServerSteamID	SVC_Messages.svc_ServerSteamID	63
CSVCMsg_CmdKeyValues	SVC_Messages.svc_CmdKeyValues	52
CSVCMsg_RconServerDetails	SVC_Messages.svc_RconServerDetails	71
CSVCMsg_PeerList	SVC_Messages.svc_PeerList	60
CSVCMsg_ClearAllStringTables	SVC_Messages.svc_ClearAllStringTables	51
CSVCMsg_FlattenedSerializer	SVC_Messages.svc_FlattenedSerializer	41
CSVCMsg_StopSound	SVC_Messages.svc_StopSound	59
CCLCMsg_HltvReplay	CLC_Messages.clc_HltvReplay	36
CSVCMsg_Broadcast_Command	SVC_Messages.svc_Broadcast_Command	74
CSVCMsg_HltvFixupOperatorStatus	SVC_Messages.svc_HltvFixupOperatorStatus	75
CSVCMsg_NextMsgPredicted	SVC_Messages.svc_NextMsgPredicted	77

Enums

CLC_Messages

CLC Messages clc_ClientInfo clc_Move clc_VoiceData clc_BaselineAck clc_RespondCvarValue clc_LoadingProgress clc_SplitPlayerConnect clc_SplitPlayerDisconnect clc_ServerStatus clc_RequestPause clc_CmdKeyValues clc_RconServerDetails clc_HltvReplay clc_Diagnostic

Schema entity: CLC_Messages

Name	Number	Message
clc_ClientInfo	20	CCLCMsg_ClientInfo
clc_Move	21	CCLCMsg_Move
clc_VoiceData	22	CCLCMsg_VoiceData
clc_BaselineAck	23	CCLCMsg_BaselineAck
clc_RespondCvarValue	25	CCLCMsg_RespondCvarValue
clc_LoadingProgress	27	CCLCMsg_LoadingProgress
clc_SplitPlayerConnect	28	CCLCMsg_SplitPlayerConnect
clc_SplitPlayerDisconnect	30	CCLCMsg_SplitPlayerDisconnect
clc_ServerStatus	31	CCLCMsg_ServerStatus
clc_RequestPause	33	CCLCMsg_RequestPause
clc_CmdKeyValues	34	CCLCMsg_CmdKeyValues
clc_RconServerDetails	35	CCLCMsg_RconServerDetails
clc_HltvReplay	36	CCLCMsg_HltvReplay
clc_Diagnostic	37	CCLCMsg_Diagnostic

SVC_Messages

SVC Messages svc_ServerInfo svc_FlattenedSerializer svc_ClassInfo svc_SetPause svc_CreateStringTable svc_UpdateStringTable svc_VoiceInit svc_VoiceData svc_Print svc_Sounds svc_SetView svc_ClearAllStringTables svc_CmdKeyValues svc_BSPDecal svc_SplitScreen svc_PacketEntities svc_Prefetch svc_Menu svc_GetCvarValue svc_StopSound svc_PeerList svc_PacketReliable svc_HLTVStatus svc_ServerSteamID svc_FullFrameSplit svc_RconServerDetails svc_UserMessage svc_Broadcast_Command svc_HltvFixupOperatorStatus svc_UserCmds svc_NextMsgPredicted

Schema entity: SVC_Messages

Name	Number	Message
svc_ServerInfo	40	CSVCMsg_ServerInfo
svc_FlattenedSerializer	41	CSVCMsg_FlattenedSerializer
svc_ClassInfo	42	CSVCMsg_ClassInfo
svc_SetPause	43	CSVCMsg_SetPause
svc_CreateStringTable	44	CSVCMsg_CreateStringTable
svc_UpdateStringTable	45	CSVCMsg_UpdateStringTable
svc_VoiceInit	46	CSVCMsg_VoiceInit
svc_VoiceData	47	CSVCMsg_VoiceData
svc_Print	48	CSVCMsg_Print
svc_Sounds	49	CSVCMsg_Sounds
svc_SetView	50	CSVCMsg_SetView
svc_ClearAllStringTables	51	CSVCMsg_ClearAllStringTables
svc_CmdKeyValues	52	CSVCMsg_CmdKeyValues
svc_BSPDecal	53	CSVCMsg_BSPDecal
svc_SplitScreen	54	CSVCMsg_SplitScreen
svc_PacketEntities	55	CSVCMsg_PacketEntities
svc_Prefetch	56	CSVCMsg_Prefetch
svc_Menu	57	CSVCMsg_Menu
svc_GetCvarValue	58	CSVCMsg_GetCvarValue
svc_StopSound	59	CSVCMsg_StopSound
svc_PeerList	60	CSVCMsg_PeerList
svc_PacketReliable	61	CSVCMsg_PacketReliable
svc_HLTVStatus	62	CSVCMsg_HLTVStatus
svc_ServerSteamID	63	CSVCMsg_ServerSteamID
svc_FullFrameSplit	70	CSVCMsg_FullFrameSplit
svc_RconServerDetails	71	CSVCMsg_RconServerDetails
svc_UserMessage	72	CSVCMsg_UserMessage
svc_Broadcast_Command	74	CSVCMsg_Broadcast_Command
svc_HltvFixupOperatorStatus	75	CSVCMsg_HltvFixupOperatorStatus
svc_UserCmds	76
svc_NextMsgPredicted	77	CSVCMsg_NextMsgPredicted

VoiceDataFormat_t

VoiceDataFormat Voice Data Format VoiceData DataFormat VOICEDATA_FORMAT_STEAM VOICEDATA_FORMAT_ENGINE VOICEDATA_FORMAT_OPUS

Schema entity: VoiceDataFormat_t

Name	Number	Message
VOICEDATA_FORMAT_STEAM	0
VOICEDATA_FORMAT_ENGINE	1
VOICEDATA_FORMAT_OPUS	2

RequestPause_t

RequestPause Request Pause RP_PAUSE RP_UNPAUSE RP_TOGGLEPAUSE

Schema entity: RequestPause_t

Name	Number	Message
RP_PAUSE	0
RP_UNPAUSE	1
RP_TOGGLEPAUSE	2

PrefetchType

Prefetch Type PFT_SOUND

Schema entity: PrefetchType

Name	Number	Message
PFT_SOUND	0

ESplitScreenMessageType

Split Screen Message Type SplitScreen ScreenMessage MessageType MSG_SPLITSCREEN_ADDUSER MSG_SPLITSCREEN_REMOVEUSER

Schema entity: ESplitScreenMessageType

Name	Number	Message
MSG_SPLITSCREEN_ADDUSER	0
MSG_SPLITSCREEN_REMOVEUSER	1

EQueryCvarValueStatus

Query Cvar Value Status QueryCvar CvarValue ValueStatus eQueryCvarValueStatus_ValueIntact eQueryCvarValueStatus_CvarNotFound eQueryCvarValueStatus_NotACvar eQueryCvarValueStatus_CvarProtected

Schema entity: EQueryCvarValueStatus

Name	Number	Message
eQueryCvarValueStatus_ValueIntact	0
eQueryCvarValueStatus_CvarNotFound	1
eQueryCvarValueStatus_NotACvar	2
eQueryCvarValueStatus_CvarProtected	3

DIALOG_TYPE

DIALOG TYPE DIALOG_MSG DIALOG_MENU DIALOG_TEXT DIALOG_ENTRY DIALOG_ASKCONNECT

Schema entity: DIALOG_TYPE

Name	Number	Message
DIALOG_MSG	0
DIALOG_MENU	1
DIALOG_TEXT	2
DIALOG_ENTRY	3
DIALOG_ASKCONNECT	4

SVC_Messages_LowFrequency

SVC Messages LowFrequency Low Frequency svc_dummy

Schema entity: SVC_Messages_LowFrequency

Name	Number	Message
svc_dummy	600

Bidirectional_Messages

Bidirectional Messages bi_RebroadcastGameEvent bi_RebroadcastSource bi_GameEvent_DEPRECATED bi_PredictionEvent

Schema entity: Bidirectional_Messages

Name	Number	Message
bi_RebroadcastGameEvent	16
bi_RebroadcastSource	17
bi_GameEvent_DEPRECATED	18
bi_PredictionEvent	19

ReplayEventType_t

ReplayEventType Replay Event Type ReplayEvent EventType REPLAY_EVENT_CANCEL REPLAY_EVENT_DEATH REPLAY_EVENT_GENERIC REPLAY_EVENT_STUCK_NEED_FULL_UPDATE REPLAY_EVENT_VICTORY

Schema entity: ReplayEventType_t

Name	Number	Message
REPLAY_EVENT_CANCEL	0
REPLAY_EVENT_DEATH	1
REPLAY_EVENT_GENERIC	2
REPLAY_EVENT_STUCK_NEED_FULL_UPDATE	3
REPLAY_EVENT_VICTORY	4

Messages

CCLCMsg_ClientInfo

CCLCMsg CCLC Msg ClientInfo Client Info send_table_crc server_count is_hltv friends_id friends_name

Sent by the client immediately after the initial connection handshake to provide hardware/software capability information.

Wire id: CLC_Messages.clc_ClientInfo = 20

Field	Number	Label	Type	Default	Description
send_table_crc	1	optional	fixed32
server_count	2	optional	uint32
is_hltv	3	optional	bool
friends_id	5	optional	uint32
friends_name	6	optional	string

CCLCMsg_Move

CCLCMsg CCLC Msg Move data last_command_number

Primary per-tick user-command message carrying all player input: view angles, buttons pressed, tick number, and move delta. This is the heartbeat of the client→server input channel.

Wire id: CLC_Messages.clc_Move = 21

Field	Number	Label	Type	Default	Description
data	3	optional	bytes
last_command_number	4	optional	uint32

CMsgVoiceAudio

Msg Voice Audio MsgVoice VoiceAudio format voice_data sequence_bytes section_number sample_rate uncompressed_sample_offset num_packets packet_offsets voice_level

Referenced by (3): CCLCMsg_VoiceData, CP2P_Voice, CSVCMsg_VoiceData

Field	Number	Label	Type	Default	Description
format	1	optional	VoiceDataFormat_t	VOICEDATA_FORMAT_STEAM
voice_data	2	optional	bytes
sequence_bytes	3	optional	int32
section_number	4	optional	uint32
sample_rate	5	optional	uint32
uncompressed_sample_offset	6	optional	uint32
num_packets	7	optional	uint32
packet_offsets	8	repeated	uint32
voice_level	9	optional	float

CCLCMsg_VoiceData

CCLCMsg CCLC Msg VoiceData Voice Data audio xuid tick

Carries a compressed voice-audio packet from the client to the server for relay to nearby players.

Wire id: CLC_Messages.clc_VoiceData = 22

Field	Number	Label	Type	Default	Description
audio	1	optional	CMsgVoiceAudio
xuid	2	optional	fixed64
tick	3	optional	uint32

CCLCMsg_BaselineAck

CCLCMsg CCLC Msg BaselineAck Baseline Ack baseline_tick baseline_nr

Acknowledges that the client has received and applied the entity baseline snapshot up to a given tick, allowing the server to stop retransmitting baseline data.

Wire id: CLC_Messages.clc_BaselineAck = 23

Field	Number	Label	Type	Default	Description
baseline_tick	1	optional	int32
baseline_nr	2	optional	int32

CCLCMsg_ListenEvents

CCLCMsg CCLC Msg ListenEvents Listen Events event_mask

Registers which game-events this client wishes to receive (similar to CMsgSource1LegacyListenEvents but at the CLC layer).

Field	Number	Label	Type	Default	Description
event_mask	1	repeated	fixed32

CCLCMsg_RespondCvarValue

CCLCMsg CCLC Msg RespondCvarValue Respond Cvar Value RespondCvar CvarValue cookie status_code name value

Client response to a CSVCMsg_GetCvarValue query; reports the current value of a convar requested by the server (e.g. for anti-cheat verification).

Wire id: CLC_Messages.clc_RespondCvarValue = 25

Field	Number	Label	Type	Default	Description
cookie	1	optional	int32
status_code	2	optional	int32
name	3	optional	string
value	4	optional	string

CCLCMsg_LoadingProgress

CCLCMsg CCLC Msg LoadingProgress Loading Progress progress

Periodic heartbeat sent by the client while loading a map, reporting the current loading percentage so the server can track all-clients-loaded state.

Wire id: CLC_Messages.clc_LoadingProgress = 27

Field	Number	Label	Type	Default	Description
progress	1	optional	int32

CCLCMsg_SplitPlayerConnect

CCLCMsg CCLC Msg SplitPlayerConnect Split Player Connect SplitPlayer PlayerConnect playername

Wire id: CLC_Messages.clc_SplitPlayerConnect = 28

Referenced by (1): C2S_CONNECT_Message

Field	Number	Label	Type	Default	Description
playername	1	optional	string

CCLCMsg_SplitPlayerDisconnect

CCLCMsg CCLC Msg SplitPlayerDisconnect Split Player Disconnect SplitPlayer PlayerDisconnect slot

Wire id: CLC_Messages.clc_SplitPlayerDisconnect = 30

Field	Number	Label	Type	Default	Description
slot	1	optional	int32

CCLCMsg_ServerStatus

CCLCMsg CCLC Msg ServerStatus Server Status simplified

Wire id: CLC_Messages.clc_ServerStatus = 31

Field	Number	Label	Type	Default	Description
simplified	1	optional	bool

CCLCMsg_RequestPause

CCLCMsg CCLC Msg RequestPause Request Pause pause_type pause_group

Client request to pause or unpause the server (only honoured when the client has appropriate privileges, e.g. tournament admin).

Wire id: CLC_Messages.clc_RequestPause = 33

Field	Number	Label	Type	Default	Description
pause_type	1	optional	RequestPause_t	RP_PAUSE
pause_group	2	optional	int32

CCLCMsg_CmdKeyValues

CCLCMsg CCLC Msg CmdKeyValues Cmd Key Values CmdKey KeyValues data

Wire id: CLC_Messages.clc_CmdKeyValues = 34

Field	Number	Label	Type	Default	Description
data	1	optional	bytes

CCLCMsg_RconServerDetails

CCLCMsg CCLC Msg RconServerDetails Rcon Server Details RconServer ServerDetails token

Wire id: CLC_Messages.clc_RconServerDetails = 35

Field	Number	Label	Type	Default	Description
token	1	optional	bytes

CCLCMsg_Diagnostic

CCLCMsg CCLC Msg Diagnostic system_specs vprof_report downstream_flow upstream_flow perf_samples

Wire id: CLC_Messages.clc_Diagnostic = 37

Field	Number	Label	Type	Default	Description
system_specs	1	optional	CMsgSource2SystemSpecs
vprof_report	2	optional	CMsgSource2VProfLiteReport
downstream_flow	3	optional	CMsgSource2NetworkFlowQuality
upstream_flow	4	optional	CMsgSource2NetworkFlowQuality
perf_samples	5	repeated	CMsgSource2PerfIntervalSample

CSVCMsg_ServerInfo

CSVCMsg CSVC Msg ServerInfo Server Info protocol server_count is_dedicated is_hltv c_os max_clients max_classes player_slot tick_interval game_dir map_name sky_name host_name addon_name game_session_config game_session_manifest

First substantial message sent by the server after handshake. Provides all configuration data the client needs to initialise its session.

Wire id: SVC_Messages.svc_ServerInfo = 40

Field	Number	Label	Type	Default	Description
protocol	1	optional	int32		Network protocol version number.
server_count	2	optional	int32		Unique server instance counter; increments on each map change.
is_dedicated	3	optional	bool		True when running on a dedicated server (as opposed to a listen server).
is_hltv	4	optional	bool		True when this connection is a GOTV/HLTV proxy.
c_os	6	optional	int32		Server operating system code (0 = Windows, 1 = Linux, 2 = macOS).
max_clients	10	optional	int32		Maximum number of player slots on this server.
max_classes	11	optional	int32		Number of entity class types registered; used to size class-info tables.
player_slot	12	optional	int32	-1	Slot index assigned to this connecting client.
tick_interval	13	optional	float		Duration of one server tick in seconds (e.g. 0.015625 for 64-tick).
game_dir	14	optional	string		Game directory name (e.g. 'csgo').
map_name	15	optional	string		Name of the map currently running on the server.
sky_name	16	optional	string		Sky-box texture set name used for the current map.
host_name	17	optional	string		Display name of the server as shown in the server browser.
addon_name	18	optional	string
game_session_config	19	optional	CSVCMsg_GameSessionConfiguration
game_session_manifest	20	optional	bytes

CSVCMsg_ClassInfo

CSVCMsg CSVC Msg ClassInfo Class Info create_on_client classes

Enumerates all entity class types known to the server, mapping numeric class IDs to class name strings. Clients use this to instantiate the correct entity objects when receiving entity creation deltas.

Wire id: SVC_Messages.svc_ClassInfo = 42

Field	Number	Label	Type	Default	Description
create_on_client	1	optional	bool		True when the client should create entity objects from this list immediately.
classes	2	repeated	CSVCMsg_ClassInfo.class_t		List of (class_id, class_name) pairs for all registered entity classes.

CSVCMsg_ClassInfo.class_t

class class_id class_name

Referenced by (1): CSVCMsg_ClassInfo

Field	Number	Label	Type	Default	Description
class_id	1	optional	int32
class_name	3	optional	string

CSVCMsg_SetPause

CSVCMsg CSVC Msg SetPause Set Pause paused

Instructs the client to enter or leave pause state.

Wire id: SVC_Messages.svc_SetPause = 43

Field	Number	Label	Type	Default	Description
paused	1	optional	bool		True to pause client-side simulation.

CSVCMsg_VoiceInit

CSVCMsg CSVC Msg VoiceInit Voice Init quality codec version

Initialises the voice-codec parameters on the client.

Wire id: SVC_Messages.svc_VoiceInit = 46

Field	Number	Label	Type	Default	Description
quality	1	optional	int32		Voice codec quality level.
codec	2	optional	string
version	3	optional	int32	0

CSVCMsg_Print

CSVCMsg CSVC Msg Print text

Wire id: SVC_Messages.svc_Print = 48

Field	Number	Label	Type	Default	Description
text	1	optional	string

CSVCMsg_Sounds

CSVCMsg CSVC Msg Sounds reliable_sound sounds

Wire id: SVC_Messages.svc_Sounds = 49

Field	Number	Label	Type	Default	Description
reliable_sound	1	optional	bool
sounds	2	repeated	CSVCMsg_Sounds.sounddata_t

CSVCMsg_Sounds.sounddata_t

sounddata origin_x origin_y origin_z volume delay_value sequence_number entity_index channel pitch flags sound_num sound_num_handle speaker_entity random_seed sound_level is_sentence is_ambient guid sound_resource_id

Referenced by (1): CSVCMsg_Sounds

Field	Number	Label	Type	Default	Description
origin_x	1	optional	sint32
origin_y	2	optional	sint32
origin_z	3	optional	sint32
volume	4	optional	uint32
delay_value	5	optional	float
sequence_number	6	optional	int32
entity_index	7	optional	int32	-1
channel	8	optional	int32
pitch	9	optional	int32
flags	10	optional	int32
sound_num	11	optional	uint32
sound_num_handle	12	optional	fixed32
speaker_entity	13	optional	int32
random_seed	14	optional	int32
sound_level	15	optional	int32
is_sentence	16	optional	bool
is_ambient	17	optional	bool
guid	18	optional	uint32
sound_resource_id	19	optional	fixed64

CSVCMsg_Prefetch

CSVCMsg CSVC Msg Prefetch sound_index resource_type

Wire id: SVC_Messages.svc_Prefetch = 56

Field	Number	Label	Type	Default	Description
sound_index	1	optional	int32
resource_type	2	optional	PrefetchType	PFT_SOUND

CSVCMsg_SetView

CSVCMsg CSVC Msg SetView Set View entity_index slot

Changes the entity index used as the origin for the client's view (e.g. switches from player view to a camera entity during replays).

Wire id: SVC_Messages.svc_SetView = 50

Field	Number	Label	Type	Default	Description
entity_index	1	optional	int32	-1	Entity index to use as the view origin.
slot	2	optional	int32	-1	Split-screen slot this view assignment applies to.

CSVCMsg_FixAngle

CSVCMsg CSVC Msg FixAngle Fix Angle relative angle

Forces the client's view angles to specific values (used for spawn orientation resets, teleports, and some map entities).

Field	Number	Label	Type	Default	Description
relative	1	optional	bool		True for a relative angle delta, false for absolute.
angle	2	optional	CMsgQAngle		Target view angle (pitch, yaw, roll).

CSVCMsg_CrosshairAngle

CSVCMsg CSVC Msg CrosshairAngle Crosshair Angle angle

Field	Number	Label	Type	Default	Description
angle	1	optional	CMsgQAngle

CSVCMsg_BSPDecal

CSVCMsg CSVC Msg BSPDecal BSP Decal pos decal_texture_index entity_index model_index low_priority

Wire id: SVC_Messages.svc_BSPDecal = 53

Field	Number	Label	Type	Default	Description
pos	1	optional	CMsgVector
decal_texture_index	2	optional	int32
entity_index	3	optional	int32	-1
model_index	4	optional	int32
low_priority	5	optional	bool

CSVCMsg_SplitScreen

CSVCMsg CSVC Msg SplitScreen Split Screen type slot player_index

Wire id: SVC_Messages.svc_SplitScreen = 54

Field	Number	Label	Type	Default	Description
type	1	optional	ESplitScreenMessageType	MSG_SPLITSCREEN_ADDUSER
slot	2	optional	int32
player_index	3	optional	int32	-1

CSVCMsg_GetCvarValue

CSVCMsg CSVC Msg GetCvarValue Get Cvar Value GetCvar CvarValue cookie cvar_name

Asks the client to report the current value of a specific convar. The client responds with CCLCMsg_RespondCvarValue.

Wire id: SVC_Messages.svc_GetCvarValue = 58

Field	Number	Label	Type	Default	Description
cookie	1	optional	int32		Opaque identifier echoed back in the response for correlation.
cvar_name	2	optional	string		Name of the convar whose value is being queried.

CSVCMsg_Menu

CSVCMsg CSVC Msg Menu dialog_type menu_key_values

Wire id: SVC_Messages.svc_Menu = 57

Field	Number	Label	Type	Default	Description
dialog_type	1	optional	int32
menu_key_values	2	optional	bytes

CSVCMsg_UserMessage

CSVCMsg CSVC Msg UserMessage User Message msg_type msg_data passthrough

Wraps a higher-level user-message (CCSUsrMsg_*, CUserMessage*) inside a network packet for reliable delivery.

Wire id: SVC_Messages.svc_UserMessage = 72

Field	Number	Label	Type	Default	Description
msg_type	1	optional	int32		User-message type ID from ECstrike15UserMessages or EBaseUserMessages.
msg_data	2	optional	bytes		Serialised protobuf payload of the specific user-message type.
passthrough	3	optional	int32		Passthrough flag used by split-screen.

CSVCMsg_SendTable

CSVCMsg CSVC Msg SendTable Send Table is_end net_table_name needs_decoder props

Field	Number	Label	Type	Default	Description
is_end	1	optional	bool
net_table_name	2	optional	string
needs_decoder	3	optional	bool
props	4	repeated	CSVCMsg_SendTable.sendprop_t

CSVCMsg_SendTable.sendprop_t

sendprop type var_name flags priority dt_name num_elements low_value high_value num_bits

Referenced by (1): CSVCMsg_SendTable

Field	Number	Label	Type	Default	Description
type	1	optional	int32
var_name	2	optional	string
flags	3	optional	int32
priority	4	optional	int32
dt_name	5	optional	string
num_elements	6	optional	int32
low_value	7	optional	float
high_value	8	optional	float
num_bits	9	optional	int32

CSVCMsg_GameEventList

CSVCMsg CSVC Msg GameEventList Game Event List GameEvent EventList descriptors

Field	Number	Label	Type	Default	Description
descriptors	1	repeated	CSVCMsg_GameEventList.descriptor_t

CSVCMsg_GameEventList.key_t

key type name

Referenced by (1): CSVCMsg_GameEventList.descriptor_t

Field	Number	Label	Type	Default	Description
type	1	optional	int32
name	2	optional	string

CSVCMsg_GameEventList.descriptor_t

descriptor eventid name keys

Referenced by (1): CSVCMsg_GameEventList

Field	Number	Label	Type	Default	Description
eventid	1	optional	int32
name	2	optional	string
keys	3	repeated	CSVCMsg_GameEventList.key_t

CSVCMsg_PacketEntities

CSVCMsg CSVC Msg PacketEntities Packet Entities max_entries updated_entries legacy_is_delta update_baseline baseline delta_from entity_data pending_full_frame active_spawngroup_handle max_spawngroup_creationsequence last_cmd_number_executed server_tick serialized_entities alternate_baselines has_pvs_vis_bits_deprecated last_cmd_number_recv_delta non_transmitted_entities cq_starved_command_ticks cq_discarded_command_ticks cmd_recv_status outofpvs_entity_updates dev_padding

The most bandwidth-intensive server message; carries the delta-compressed entity-state update for all entities that changed since the client's last acknowledged snapshot.

The inner data blob is decoded using the Source 2 entity-delta codec. Demo parsers (demoinfocs-golang, etc.) spend most of their time processing this message.

Wire id: SVC_Messages.svc_PacketEntities = 55

Field	Number	Label	Type	Default	Description
max_entries	1	optional	int32		Maximum entity index present in this packet.
updated_entries	2	optional	int32		Number of entity change records in the data blob.
legacy_is_delta	3	optional	bool		Legacy flag: true for incremental updates; false for a full baseline snapshot.
update_baseline	4	optional	bool
baseline	5	optional	int32		Which baseline buffer (0 or 1) the data is relative to.
delta_from	6	optional	int32		Tick that the delta originates from.
entity_data	7	optional	bytes		Binary blob of delta-encoded entity field changes.
pending_full_frame	8	optional	bool
active_spawngroup_handle	9	optional	uint32
max_spawngroup_creationsequence	10	optional	uint32
last_cmd_number_executed	11	optional	uint32
server_tick	12	optional	uint32
serialized_entities	13	optional	bytes
alternate_baselines	15	repeated	CSVCMsg_PacketEntities.alternate_baseline_t
has_pvs_vis_bits_deprecated	16	optional	uint32
last_cmd_number_recv_delta	17	optional	sint32
non_transmitted_entities	19	optional	CSVCMsg_PacketEntities.non_transmitted_entities_t
cq_starved_command_ticks	20	optional	uint32
cq_discarded_command_ticks	21	optional	uint32
cmd_recv_status	22	repeated	sint32
outofpvs_entity_updates	23	optional	CSVCMsg_PacketEntities.outofpvs_entity_updates_t
dev_padding	999	optional	bytes

CSVCMsg_PacketEntities.alternate_baseline_t

alternate baseline entity_index baseline_index

Referenced by (1): CSVCMsg_PacketEntities

Field	Number	Label	Type	Default	Description
entity_index	1	optional	int32
baseline_index	2	optional	int32

CSVCMsg_PacketEntities.non_transmitted_entities_t

non transmitted entities header_count data

Referenced by (1): CSVCMsg_PacketEntities

Field	Number	Label	Type	Default	Description
header_count	1	optional	int32
data	2	optional	bytes

CSVCMsg_PacketEntities.outofpvs_entity_updates_t

outofpvs entity updates count data

Referenced by (1): CSVCMsg_PacketEntities

Field	Number	Label	Type	Default	Description
count	1	optional	int32
data	2	optional	bytes

CSVCMsg_TempEntities

CSVCMsg CSVC Msg TempEntities Temp Entities reliable num_entries entity_data

Batches one or more temporary-entity (TE) events into a single reliable message. TE events produce short-lived visual/audio effects without creating persistent server entities.

Field	Number	Label	Type	Default	Description
reliable	1	optional	bool
num_entries	2	optional	int32		Number of TE entries packed into this message.
entity_data	3	optional	bytes		Serialised list of TE event data blobs.

CSVCMsg_CreateStringTable

CSVCMsg CSVC Msg CreateStringTable Create String Table CreateString StringTable name num_entries user_data_fixed_size user_data_size user_data_size_bits flags string_data uncompressed_size data_compressed using_varint_bitcounts

Creates a new named string table on the client, initialised with the provided data blob. String tables are the primary mechanism for sharing static/semi-static lookup data (model precache, sound precache, user info, etc.).

Wire id: SVC_Messages.svc_CreateStringTable = 44

Field	Number	Label	Type	Default	Description
name	1	optional	string		Unique name of the string table (e.g. 'userinfo', 'modelprecache').
num_entries	2	optional	int32		Number of entries in the initial table.
user_data_fixed_size	3	optional	bool		True when all entries have fixed-size user-data blobs.
user_data_size	4	optional	int32		Fixed user-data size in bytes (valid when user_data_fixed_size is true).
user_data_size_bits	5	optional	int32		Bit-width of each user-data field.
flags	6	optional	int32		Table flags (e.g. FSTRINGTAB_DICTIONARY_ENABLED).
string_data	7	optional	bytes		Serialised table data blob (may be compressed).
uncompressed_size	8	optional	int32		Size of the data after decompression (0 when not compressed).
data_compressed	9	optional	bool		True when string_data is compressed.
using_varint_bitcounts	10	optional	bool		True when the serialised bit-counts are encoded as varints.

CSVCMsg_UpdateStringTable

CSVCMsg CSVC Msg UpdateStringTable Update String Table UpdateString StringTable table_id num_changed_entries string_data

Incremental update to an existing string table, adding or modifying entries since the last full snapshot.

Wire id: SVC_Messages.svc_UpdateStringTable = 45

Field	Number	Label	Type	Default	Description
table_id	1	optional	int32		Index of the string table to update.
num_changed_entries	2	optional	int32		Number of changed entries in this update.
string_data	3	optional	bytes		Delta-encoded table data blob.

CSVCMsg_VoiceData

CSVCMsg CSVC Msg VoiceData Voice Data audio client_deprecated proximity xuid audible_mask tick passthrough entity

Relays a voice-audio packet from a speaking player to all listeners.

Wire id: SVC_Messages.svc_VoiceData = 47

Field	Number	Label	Type	Default	Description
audio	1	optional	CMsgVoiceAudio		CMsgVoiceAudio containing the compressed audio data and format.
client_deprecated	2	optional	int32	-1	Deprecated. Player slot index of the speaker.
proximity	3	optional	bool		True when the voice is 3D positional (proximity voice chat).
xuid	4	optional	fixed64
audible_mask	5	optional	int32		Bitmask of player slots that should hear this audio.
tick	6	optional	uint32
passthrough	7	optional	int32
entity	8	optional	int32	-1

CSVCMsg_PacketReliable

CSVCMsg CSVC Msg PacketReliable Packet Reliable tick messagessize state

Reliable wrapper for delta packets that must be delivered in order and without loss (e.g. initial baseline or important game-state transitions).

Wire id: SVC_Messages.svc_PacketReliable = 61

Field	Number	Label	Type	Default	Description
tick	1	optional	int32
messagessize	2	optional	int32
state	3	optional	bool

CSVCMsg_FullFrameSplit

CSVCMsg CSVC Msg FullFrameSplit Full Frame Split FullFrame FrameSplit tick section total data

Wire id: SVC_Messages.svc_FullFrameSplit = 70

Field	Number	Label	Type	Default	Description
tick	1	optional	int32
section	2	optional	int32
total	3	optional	int32
data	4	optional	bytes

CSVCMsg_HLTVStatus

CSVCMsg CSVC Msg HLTVStatus HLTV Status master clients slots proxies

Wire id: SVC_Messages.svc_HLTVStatus = 62

Field	Number	Label	Type	Default	Description
master	1	optional	string
clients	2	optional	int32
slots	3	optional	int32
proxies	4	optional	int32

CSVCMsg_ServerSteamID

CSVCMsg CSVC Msg ServerSteamID Server Steam ID ServerSteam SteamID steam_id

Wire id: SVC_Messages.svc_ServerSteamID = 63

Field	Number	Label	Type	Default	Description
steam_id	1	optional	uint64

CSVCMsg_CmdKeyValues

CSVCMsg CSVC Msg CmdKeyValues Cmd Key Values CmdKey KeyValues data

Wire id: SVC_Messages.svc_CmdKeyValues = 52

Field	Number	Label	Type	Default	Description
data	1	optional	bytes

CSVCMsg_RconServerDetails

CSVCMsg CSVC Msg RconServerDetails Rcon Server Details RconServer ServerDetails token details

Wire id: SVC_Messages.svc_RconServerDetails = 71

Field	Number	Label	Type	Default	Description
token	1	optional	bytes
details	2	optional	string

CMsgIPCAddress

Msg IPC Address MsgIPC IPCAddress computer_guid process_id

Referenced by (1): CMsgServerPeer

Field	Number	Label	Type	Default	Description
computer_guid	1	optional	fixed64
process_id	2	optional	uint32

CMsgServerPeer

Msg Server Peer MsgServer ServerPeer player_slot steamid ipc they_hear_you you_hear_them is_listenserver_host

Referenced by (1): CSVCMsg_PeerList

Field	Number	Label	Type	Default	Description
player_slot	1	optional	int32	-1
steamid	2	optional	fixed64
ipc	3	optional	CMsgIPCAddress
they_hear_you	4	optional	bool
you_hear_them	5	optional	bool
is_listenserver_host	6	optional	bool

CSVCMsg_PeerList

CSVCMsg CSVC Msg PeerList Peer List peer

Wire id: SVC_Messages.svc_PeerList = 60

Field	Number	Label	Type	Default	Description
peer	1	repeated	CMsgServerPeer

CSVCMsg_ClearAllStringTables

CSVCMsg CSVC Msg ClearAllStringTables Clear All String Tables ClearAll AllString StringTables mapname create_tables_skipped

Wire id: SVC_Messages.svc_ClearAllStringTables = 51

Field	Number	Label	Type	Default	Description
mapname	1	optional	string
create_tables_skipped	3	optional	bool

ProtoFlattenedSerializerField_t

ProtoFlattenedSerializerField Proto Flattened Serializer Field ProtoFlattened FlattenedSerializer SerializerField var_type_sym var_name_sym bit_count low_value high_value encode_flags field_serializer_name_sym field_serializer_version send_node_sym var_encoder_sym polymorphic_types var_serializer_sym

Referenced by (1): CSVCMsg_FlattenedSerializer

Field	Number	Label	Type	Default	Description
var_type_sym	1	optional	int32
var_name_sym	2	optional	int32
bit_count	3	optional	int32
low_value	4	optional	float
high_value	5	optional	float
encode_flags	6	optional	int32
field_serializer_name_sym	7	optional	int32
field_serializer_version	8	optional	int32
send_node_sym	9	optional	int32
var_encoder_sym	10	optional	int32
polymorphic_types	11	repeated	ProtoFlattenedSerializerField_t.polymorphic_field_t
var_serializer_sym	12	optional	int32

ProtoFlattenedSerializerField_t.polymorphic_field_t

polymorphic field polymorphic_field_serializer_name_sym polymorphic_field_serializer_version

Referenced by (1): ProtoFlattenedSerializerField_t

Field	Number	Label	Type	Default	Description
polymorphic_field_serializer_name_sym	1	optional	int32
polymorphic_field_serializer_version	2	optional	int32

ProtoFlattenedSerializer_t

ProtoFlattenedSerializer Proto Flattened Serializer ProtoFlattened FlattenedSerializer serializer_name_sym serializer_version fields_index

Referenced by (1): CSVCMsg_FlattenedSerializer

Field	Number	Label	Type	Default	Description
serializer_name_sym	1	optional	int32
serializer_version	2	optional	int32
fields_index	3	repeated	int32

CSVCMsg_FlattenedSerializer

CSVCMsg CSVC Msg FlattenedSerializer Flattened Serializer serializers symbols fields

Wire id: SVC_Messages.svc_FlattenedSerializer = 41

Field	Number	Label	Type	Default	Description
serializers	1	repeated	ProtoFlattenedSerializer_t
symbols	2	repeated	string
fields	3	repeated	ProtoFlattenedSerializerField_t

CSVCMsg_StopSound

CSVCMsg CSVC Msg StopSound Stop Sound guid

Wire id: SVC_Messages.svc_StopSound = 59

Field	Number	Label	Type	Default	Description
guid	1	optional	fixed32

CBidirMsg_RebroadcastGameEvent

CBidirMsg Bidir Msg BidirMsg RebroadcastGameEvent Rebroadcast Game Event RebroadcastGame GameEvent posttoserver buftype clientbitcount receivingclients

Field	Number	Label	Type	Default	Description
posttoserver	1	optional	bool
buftype	2	optional	int32
clientbitcount	3	optional	uint32
receivingclients	4	optional	uint64

CBidirMsg_RebroadcastSource

CBidirMsg Bidir Msg BidirMsg RebroadcastSource Rebroadcast Source eventsource

Field	Number	Label	Type	Default	Description
eventsource	1	optional	int32

CBidirMsg_PredictionEvent

CBidirMsg Bidir Msg BidirMsg PredictionEvent Prediction Event event_id event_data sync_type sync_val_uint32

Field	Number	Label	Type	Default	Description
event_id	1	optional	uint32
event_data	2	optional	bytes
sync_type	3	optional	uint32
sync_val_uint32	4	optional	uint32

CBidirMsg_PredictionEvent.ESyncType

Sync Type SyncType ST_Tick ST_UserCmdNum

Name	Number	Message
ST_Tick	0
ST_UserCmdNum	1

CMsgServerNetworkStats

Msg Server Network Stats MsgServer ServerNetwork NetworkStats dedicated cpu_usage memory_used_mb memory_free_mb uptime spawn_count num_clients num_bots num_spectators num_tv_relays fps ports avg_ping_ms avg_engine_latency_out avg_packets_out avg_packets_in avg_loss_out avg_loss_in avg_data_out avg_data_in total_data_in total_packets_in total_data_out total_packets_out players

Field	Number	Label	Type	Default	Description
dedicated	1	optional	bool
cpu_usage	2	optional	int32
memory_used_mb	3	optional	int32
memory_free_mb	4	optional	int32
uptime	5	optional	int32
spawn_count	6	optional	int32
num_clients	8	optional	int32
num_bots	9	optional	int32
num_spectators	10	optional	int32
num_tv_relays	11	optional	int32
fps	12	optional	float
ports	17	repeated	CMsgServerNetworkStats.Port
avg_ping_ms	18	optional	float
avg_engine_latency_out	19	optional	float
avg_packets_out	20	optional	float
avg_packets_in	21	optional	float
avg_loss_out	22	optional	float
avg_loss_in	23	optional	float
avg_data_out	24	optional	float
avg_data_in	25	optional	float
total_data_in	26	optional	uint64
total_packets_in	27	optional	uint64
total_data_out	28	optional	uint64
total_packets_out	29	optional	uint64
players	30	repeated	CMsgServerNetworkStats.Player

CMsgServerNetworkStats.Port

port name

Referenced by (1): CMsgServerNetworkStats

Field	Number	Label	Type	Default	Description
port	1	optional	int32
name	2	optional	string

CMsgServerNetworkStats.Player

steamid remote_addr ping_avg_ms packet_loss_pct is_bot loss_in loss_out engine_latency_ms

Referenced by (1): CMsgServerNetworkStats

Field	Number	Label	Type	Default	Description
steamid	1	optional	uint64
remote_addr	2	optional	string
ping_avg_ms	4	optional	int32
packet_loss_pct	5	optional	float
is_bot	6	optional	bool
loss_in	7	optional	float
loss_out	8	optional	float
engine_latency_ms	9	optional	int32

CSVCMsg_HltvReplay

CSVCMsg CSVC Msg HltvReplay Hltv Replay delay primary_target replay_stop_at replay_start_at replay_slowdown_begin replay_slowdown_end replay_slowdown_rate reason

Field	Number	Label	Type	Default	Description
delay	1	optional	int32
primary_target	2	optional	int32	-1
replay_stop_at	3	optional	int32
replay_start_at	4	optional	int32
replay_slowdown_begin	5	optional	int32
replay_slowdown_end	6	optional	int32
replay_slowdown_rate	7	optional	float
reason	8	optional	int32

CCLCMsg_HltvReplay

CCLCMsg CCLC Msg HltvReplay Hltv Replay request slowdown_length slowdown_rate primary_target event_time

Wire id: CLC_Messages.clc_HltvReplay = 36

Field	Number	Label	Type	Default	Description
request	1	optional	int32
slowdown_length	2	optional	float
slowdown_rate	3	optional	float
primary_target	4	optional	int32	-1
event_time	5	optional	float

CSVCMsg_Broadcast_Command

CSVCMsg CSVC Msg Broadcast Command cmd

Wire id: SVC_Messages.svc_Broadcast_Command = 74

Field	Number	Label	Type	Default	Description
cmd	1	optional	string

CCLCMsg_HltvFixupOperatorTick

CCLCMsg CCLC Msg HltvFixupOperatorTick Hltv Fixup Operator Tick HltvFixup FixupOperator OperatorTick tick props_data origin eye_angles observer_mode cameraman_scoreboard observer_target view_offset

Field	Number	Label	Type	Default	Description
tick	1	optional	int32
props_data	2	optional	bytes
origin	3	optional	CMsgVector
eye_angles	4	optional	CMsgQAngle
observer_mode	5	optional	int32
cameraman_scoreboard	6	optional	bool
observer_target	7	optional	int32
view_offset	8	optional	CMsgVector

CSVCMsg_HltvFixupOperatorStatus

CSVCMsg CSVC Msg HltvFixupOperatorStatus Hltv Fixup Operator Status HltvFixup FixupOperator OperatorStatus mode override_operator_name

Wire id: SVC_Messages.svc_HltvFixupOperatorStatus = 75

Field	Number	Label	Type	Default	Description
mode	1	optional	uint32
override_operator_name	2	optional	string

CMsgServerUserCmd

Msg Server User Cmd MsgServer ServerUser UserCmd data cmd_number player_slot server_tick_executed client_tick delta_data

Referenced by (1): CSVCMsg_UserCommands

Field	Number	Label	Type	Default	Description
data	1	optional	bytes
cmd_number	2	optional	int32
player_slot	3	optional	int32	-1
server_tick_executed	4	optional	int32
client_tick	5	optional	int32
delta_data	6	optional	bytes

CSVCMsg_UserCommands

CSVCMsg CSVC Msg UserCommands User Commands commands

Field	Number	Label	Type	Default	Description
commands	1	repeated	CMsgServerUserCmd

CSVCMsg_NextMsgPredicted

CSVCMsg CSVC Msg NextMsgPredicted Next Predicted NextMsg MsgPredicted predicted_by_player_slot message_type_id

Wire id: SVC_Messages.svc_NextMsgPredicted = 77

Field	Number	Label	Type	Default	Description
predicted_by_player_slot	1	optional	int32	-1
message_type_id	2	optional	uint32

Reference graph

Message reference graph (28 edges)

flowchart LR
    n0["CCLCMsg_VoiceData"]
    n1["CMsgVoiceAudio"]
    n0 --> n1
    n2["CCLCMsg_Diagnostic"]
    n3["CMsgSource2SystemSpecs"]
    n2 --> n3
    n4["CMsgSource2VProfLiteReport"]
    n2 --> n4
    n5["CMsgSource2NetworkFlowQuality"]
    n2 --> n5
    n6["CMsgSource2PerfIntervalSample"]
    n2 --> n6
    n7["CSVCMsg_ServerInfo"]
    n8["CSVCMsg_GameSessionConfiguration"]
    n7 --> n8
    n9["CSVCMsg_ClassInfo"]
    n10["CSVCMsg_ClassInfo.class_t"]
    n9 --> n10
    n11["CSVCMsg_Sounds"]
    n12["CSVCMsg_Sounds.sounddata_t"]
    n11 --> n12
    n13["CSVCMsg_FixAngle"]
    n14["CMsgQAngle"]
    n13 --> n14
    n15["CSVCMsg_CrosshairAngle"]
    n15 --> n14
    n16["CSVCMsg_BSPDecal"]
    n17["CMsgVector"]
    n16 --> n17
    n18["CSVCMsg_SendTable"]
    n19["CSVCMsg_SendTable.sendprop_t"]
    n18 --> n19
    n20["CSVCMsg_GameEventList"]
    n21["CSVCMsg_GameEventList.descriptor_t"]
    n20 --> n21
    n22["CSVCMsg_GameEventList.key_t"]
    n21 --> n22
    n23["CSVCMsg_PacketEntities"]
    n24["CSVCMsg_PacketEntities.alternate_baseline_t"]
    n23 --> n24
    n25["CSVCMsg_PacketEntities.non_transmitted_entities_t"]
    n23 --> n25
    n26["CSVCMsg_PacketEntities.outofpvs_entity_updates_t"]
    n23 --> n26
    n27["CSVCMsg_VoiceData"]
    n27 --> n1
    n28["CMsgServerPeer"]
    n29["CMsgIPCAddress"]
    n28 --> n29
    n30["CSVCMsg_PeerList"]
    n30 --> n28
    n31["ProtoFlattenedSerializerField_t"]
    n32["ProtoFlattenedSerializerField_t.polymorphic_field_t"]
    n31 --> n32
    n33["CSVCMsg_FlattenedSerializer"]
    n34["ProtoFlattenedSerializer_t"]
    n33 --> n34
    n33 --> n31
    n35["CMsgServerNetworkStats"]
    n36["CMsgServerNetworkStats.Port"]
    n35 --> n36
    n37["CMsgServerNetworkStats.Player"]
    n35 --> n37
    n38["CCLCMsg_HltvFixupOperatorTick"]
    n38 --> n17
    n38 --> n14
    n39["CSVCMsg_UserCommands"]
    n40["CMsgServerUserCmd"]
    n39 --> n40