From 7133fe80c6615297dfef3653981e766ff5d56038 Mon Sep 17 00:00:00 2001
From: pg9182 <96569817+pg9182@users.noreply.github.com>
Date: Thu, 5 Jan 2023 17:03:37 -0500
Subject: Restrict chat message charset (#389)

---
 NorthstarDLL/scripts/client/clientchathooks.cpp | 27 +++++++++++++++++++++++++
 NorthstarDLL/server/serverchathooks.cpp         | 27 +++++++++++++++++++++++++
 2 files changed, 54 insertions(+)

(limited to 'NorthstarDLL')

diff --git a/NorthstarDLL/scripts/client/clientchathooks.cpp b/NorthstarDLL/scripts/client/clientchathooks.cpp
index 0fc68302..d4fa0c41 100644
--- a/NorthstarDLL/scripts/client/clientchathooks.cpp
+++ b/NorthstarDLL/scripts/client/clientchathooks.cpp
@@ -8,6 +8,25 @@
 
 AUTOHOOK_INIT()
 
+static char* skip_valid_ansi_csi_sgr(char* str)
+{
+	if (*str++ != '\x1B')
+		return NULL;
+	if (*str++ != '[') // CSI
+		return NULL;
+	for (char* c = str; *c; c++)
+	{
+		if (*c >= '0' && *c <= '9')
+			continue;
+		if (*c == ';')
+			continue;
+		if (*c == 'm') // SGR
+			break;
+		return NULL;
+	}
+	return str;
+}
+
 // clang-format off
 AUTOHOOK(CHudChat__AddGameLine, client.dll + 0x22E580,
 void, __fastcall, (void* self, const char* message, int inboxId, bool isTeam, bool isDead))
@@ -30,6 +49,14 @@ void, __fastcall, (void* self, const char* message, int inboxId, bool isTeam, bo
 		payload = message + 1;
 	}
 
+	for (char* c = const_cast<char*>(message); *c; c++)
+	{
+		if (*c == '\x1B' && (c = skip_valid_ansi_csi_sgr(c)))
+			c--;
+		else if (*c <= 9 || (*c >= 12 && *c <= 31))
+			*c = ' ';
+	}
+
 	SQRESULT result = g_pSquirrel<ScriptContext::CLIENT>->Call(
 		"CHudChat_ProcessMessageStartThread", static_cast<int>(senderId) - 1, payload, isTeam, isDead, type);
 	if (result == SQRESULT_ERROR)
diff --git a/NorthstarDLL/server/serverchathooks.cpp b/NorthstarDLL/server/serverchathooks.cpp
index 57c2c31a..eb0034c0 100644
--- a/NorthstarDLL/server/serverchathooks.cpp
+++ b/NorthstarDLL/server/serverchathooks.cpp
@@ -34,12 +34,39 @@ void(__fastcall* MessageWriteByte)(int iValue);
 void(__fastcall* MessageWriteString)(const char* sz);
 void(__fastcall* MessageWriteBool)(bool bValue);
 
+static char* skip_valid_ansi_csi_sgr(char* str)
+{
+	if (*str++ != '\x1B')
+		return NULL;
+	if (*str++ != '[') // CSI
+		return NULL;
+	for (char* c = str; *c; c++)
+	{
+		if (*c >= '0' && *c <= '9')
+			continue;
+		if (*c == ';')
+			continue;
+		if (*c == 'm') // SGR
+			break;
+		return NULL;
+	}
+	return str;
+}
+
 bool bShouldCallSayTextHook = false;
 // clang-format off
 AUTOHOOK(_CServerGameDLL__OnReceivedSayTextMessage, server.dll + 0x1595C0,
 void, __fastcall, (CServerGameDLL* self, unsigned int senderPlayerId, const char* text, bool isTeam))
 // clang-format on
 {
+	for (char* c = const_cast<char*>(text); *c; c++)
+	{
+		if (*c == '\x1B' && (c = skip_valid_ansi_csi_sgr(c)))
+			c--;
+		else if (*c <= 9 || (*c >= 12 && *c <= 31))
+			*c = ' ';
+	}
+
 	// MiniHook doesn't allow calling the base function outside of anywhere but the hook function.
 	// To allow bypassing the hook, isSkippingHook can be set.
 	if (bShouldCallSayTextHook)
-- 
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