From a7dec217171dd0417068110c82f6d0b8039c92d2 Mon Sep 17 00:00:00 2001
From: s1lentq <s1lentsk@yandex.ru>
Date: Thu, 18 Jan 2024 21:38:33 +0700
Subject: [PATCH] Implemented optional CVar sv_tags for sets a string defining
 the "gametags" for this server to allows users/scripts to filter in the
 matchmaking/server-browser interfaces based on the value

---
 rehlds/engine/server.h      |  1 +
 rehlds/engine/sv_main.cpp   |  3 +++
 rehlds/engine/sv_steam3.cpp | 23 +++++++++++++++++++++++
 rehlds/engine/sv_steam3.h   |  7 +++++++
 4 files changed, 34 insertions(+)

diff --git a/rehlds/engine/server.h b/rehlds/engine/server.h
index e22b889ea..c59332e16 100644
--- a/rehlds/engine/server.h
+++ b/rehlds/engine/server.h
@@ -366,6 +366,7 @@ extern cvar_t sv_visiblemaxplayers;
 extern cvar_t sv_downloadurl;
 extern cvar_t sv_allow_dlfile;
 extern cvar_t sv_version;
+extern cvar_t sv_tags;
 #ifdef REHLDS_FIXES
 extern cvar_t sv_echo_unknown_cmd;
 extern cvar_t sv_auto_precache_sounds_in_models;
diff --git a/rehlds/engine/sv_main.cpp b/rehlds/engine/sv_main.cpp
index d3e1ff7bd..59d35884c 100644
--- a/rehlds/engine/sv_main.cpp
+++ b/rehlds/engine/sv_main.cpp
@@ -193,6 +193,8 @@ cvar_t sv_version = { "sv_version", "", FCVAR_SERVER, 0.0f, NULL };
 cvar_t sv_version = {"sv_version", "", 0, 0.0f, NULL};
 #endif
 
+cvar_t sv_tags = { "sv_tags", "", 0, 0.0f, NULL };
+
 cvar_t sv_rcon_minfailures = { "sv_rcon_minfailures", "5", 0, 0.0f, NULL };
 cvar_t sv_rcon_maxfailures = { "sv_rcon_maxfailures", "10", 0, 0.0f, NULL };
 cvar_t sv_rcon_minfailuretime = { "sv_rcon_minfailuretime", "30", 0, 0.0f, NULL };
@@ -8258,6 +8260,7 @@ void SV_Init(void)
 	Cvar_RegisterVariable(&sv_version);
 	Cvar_RegisterVariable(&sv_allow_dlfile);
 #ifdef REHLDS_FIXES
+	Cvar_RegisterVariable(&sv_tags);
 	Cvar_RegisterVariable(&sv_force_ent_intersection);
 	Cvar_RegisterVariable(&sv_echo_unknown_cmd);
 	Cvar_RegisterVariable(&sv_auto_precache_sounds_in_models);
diff --git a/rehlds/engine/sv_steam3.cpp b/rehlds/engine/sv_steam3.cpp
index ad288fa57..577edd322 100644
--- a/rehlds/engine/sv_steam3.cpp
+++ b/rehlds/engine/sv_steam3.cpp
@@ -232,6 +232,10 @@ CSteam3Server::CSteam3Server() :
 	m_CallbackLogonFailure(this, &CSteam3Server::OnLogonFailure),
 	m_SteamIDGS(1, 0, k_EUniverseInvalid, k_EAccountTypeInvalid)
 {
+#ifdef REHLDS_FIXES
+	m_GameTagsData[0] = '\0';
+#endif
+
 	m_bHasActivePlayers = false;
 	m_bWantToBeSecure = false;
 	m_bLanOnly = false;
@@ -499,6 +503,23 @@ void CSteam3Server::RunFrame()
 	}
 }
 
+void CSteam3Server::UpdateGameTags()
+{
+#ifdef REHLDS_FIXES
+	if (!sv_tags.string[0])
+		return;
+
+	if (m_GameTagsData[0] && !Q_stricmp(m_GameTagsData, sv_tags.string))
+		return;
+
+	const int nPacketSize = MAX_ROUTEABLE_PACKET - 128;	// The packet has to fit into NET_SendPacket and there's some data sent before the tags too
+	ISteamGameServer;
+	Q_strlcpy(m_GameTagsData, sv_tags.string, min(nPacketSize, MAX_STEAM_TAGS_LENGTH));
+	Q_strlwr(m_GameTagsData);
+	CRehldsPlatformHolder::get()->SteamGameServer()->SetGameTags(m_GameTagsData);
+#endif
+}
+
 void CSteam3Server::SendUpdatedServerDetails()
 {
 	int botCount = 0;
@@ -521,6 +542,8 @@ void CSteam3Server::SendUpdatedServerDetails()
 	CRehldsPlatformHolder::get()->SteamGameServer()->SetBotPlayerCount(botCount);
 	CRehldsPlatformHolder::get()->SteamGameServer()->SetServerName(Cvar_VariableString("hostname"));
 	CRehldsPlatformHolder::get()->SteamGameServer()->SetMapName(g_psv.name);
+
+	UpdateGameTags();
 }
 
 void CSteam3Client::Shutdown()
diff --git a/rehlds/engine/sv_steam3.h b/rehlds/engine/sv_steam3.h
index 1aa2e51aa..3238dc87b 100644
--- a/rehlds/engine/sv_steam3.h
+++ b/rehlds/engine/sv_steam3.h
@@ -54,6 +54,8 @@ class CSteam3
 	bool InitModule();
 };
 
+#define MAX_STEAM_TAGS_LENGTH 128 // Steam doesn't send tags string more than 128 bytes
+
 class CSteam3Server: public CSteam3
 {
 public:
@@ -71,6 +73,10 @@ class CSteam3Server: public CSteam3
 	bool m_bLanOnly;
 	CSteamID m_SteamIDGS;
 
+#ifdef REHLDS_FIXES
+	char m_GameTagsData[MAX_STEAM_TAGS_LENGTH];
+#endif
+
 public:
 
 	NOBODY void SetServerType();
@@ -96,6 +102,7 @@ class CSteam3Server: public CSteam3
 	void NotifyOfLevelChange(bool bForce);
 	void RunFrame();
 	void SendUpdatedServerDetails();
+	void UpdateGameTags();
 };
 
 class CSteam3Client: public CSteam3