From a00a574b4a56d933febb9f7ac1dd5c2ebe23bb88 Mon Sep 17 00:00:00 2001
From: Marco Hladik <marco@icculus.org>
Date: Fri, 14 Aug 2020 22:13:03 +0200
Subject: [PATCH] Plugins: Added ClientConnect and ClientDisconnect hooks

---
 src/server/defs.h              |  1 +
 src/server/plugins.c           | 74 ++++++++++++++++++++++++++++++++--
 src/server/plugins.h           | 25 ++++++++++++
 src/server/valve/gamerules.cpp |  9 +++--
 4 files changed, 103 insertions(+), 6 deletions(-)
 create mode 100644 src/server/plugins.h

diff --git a/src/server/defs.h b/src/server/defs.h
index c3b85bd5..f74706d4 100644
--- a/src/server/defs.h
+++ b/src/server/defs.h
@@ -23,6 +23,7 @@
 #include "spawn.h"
 #include "flashlight.h"
 #include "weapons.h"
+#include "plugins.h"
 
 #define CLASSEXPORT(classname,classa) void classname(void) { spawnfunc_##classa(); }
 
diff --git a/src/server/plugins.c b/src/server/plugins.c
index 0b7ca614..be0654da 100644
--- a/src/server/plugins.c
+++ b/src/server/plugins.c
@@ -14,9 +14,6 @@
  * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
-var int g_plugins_enabled;
-var int autocvar_sv_plugins = 1;
-
 typedef struct
 {
 	string m_strPath;
@@ -156,3 +153,74 @@ Plugin_ParseClientCommand(string msg)
 
 	return rval;
 }
+
+/*
+=================
+Plugin_PlayerConnect
+
+Called whenever a new client connect to the game
+=================
+*/
+int
+Plugin_PlayerConnect(entity cl)
+{
+	int rval;
+	int tval;
+	int(entity) vFunc;
+
+	if (g_plugins_enabled == 0)
+		return FALSE;
+
+	/* rval = final return value, tval = temporary return value.
+	   if at least one of the plugins returns TRUE, then RunClientCommand
+	   will not be called by the engine, as it should be */
+	rval = FALSE;
+	tval = FALSE;
+
+	for (int i = 0; i < g_plugincount; i++) {
+		 vFunc = externvalue(g_plugindb[i].m_flProgsID, "FMX_PlayerConnect");
+
+		if (vFunc) {
+			tval = vFunc(cl);
+			rval |= tval;
+		}
+	}
+
+	return rval;
+}
+
+
+/*
+=================
+Plugin_PlayerDisconnect
+
+Called whenever a client leaves the game
+=================
+*/
+int
+Plugin_PlayerDisconnect(entity cl)
+{
+	int rval;
+	int tval;
+	int(entity) vFunc;
+
+	if (g_plugins_enabled == 0)
+		return FALSE;
+
+	/* rval = final return value, tval = temporary return value.
+	   if at least one of the plugins returns TRUE, then RunClientCommand
+	   will not be called by the engine, as it should be */
+	rval = FALSE;
+	tval = FALSE;
+
+	for (int i = 0; i < g_plugincount; i++) {
+		 vFunc = externvalue(g_plugindb[i].m_flProgsID, "FMX_PlayerDisconnect");
+
+		if (vFunc) {
+			tval = vFunc(cl);
+			rval |= tval;
+		}
+	}
+
+	return rval;
+}
diff --git a/src/server/plugins.h b/src/server/plugins.h
new file mode 100644
index 00000000..9300aa0c
--- /dev/null
+++ b/src/server/plugins.h
@@ -0,0 +1,25 @@
+/*
+ * Copyright (c) 2016-2020 Marco Hladik <marco@icculus.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
+ * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
+ * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+var int g_plugins_enabled;
+var int autocvar_sv_plugins = 1;
+
+void Plugin_Init(void);
+void Plugin_Shutdown(void);
+int Plugin_RunClientCommand(void);
+int Plugin_ParseClientCommand(string msg);
+int Plugin_PlayerConnect(entity cl);
+int Plugin_PlayerDisconnect(entity cl);
diff --git a/src/server/valve/gamerules.cpp b/src/server/valve/gamerules.cpp
index 89489b47..450f9a99 100644
--- a/src/server/valve/gamerules.cpp
+++ b/src/server/valve/gamerules.cpp
@@ -208,7 +208,9 @@ void
 HLGameRules::PlayerConnect(entity pl)
 {
 	entity a;
-	bprint(PRINT_HIGH, sprintf("%s connected\n", pl.netname));
+
+	if (Plugin_PlayerConnect(pl) == FALSE)
+		bprint(PRINT_HIGH, sprintf("%s connected\n", pl.netname));
 
 	int playercount = 0;
 	for (a = world; (a = find(a, ::classname, "player"));) {
@@ -228,7 +230,8 @@ HLGameRules::PlayerConnect(entity pl)
 void
 HLGameRules::PlayerDisconnect(entity pl)
 {
-	bprint(PRINT_HIGH, sprintf("%s disconnected\n", pl.netname));
+	if (Plugin_PlayerDisconnect(pl) == FALSE)
+		bprint(PRINT_HIGH, sprintf("%s disconnected\n", pl.netname));
 
 	/* Make this unusable */
 	pl.solid = SOLID_NOT;
@@ -236,7 +239,7 @@ HLGameRules::PlayerDisconnect(entity pl)
 	pl.modelindex = 0;
 	pl.health = 0;
 	pl.takedamage = 0;
-	pl.SendFlags = PLAYER_MODELINDEX;
+	pl.SendFlags = -1;
 }
 
 void