Fix crash after GameSpy client query

In CGameSpy_QR2::Init we should not pass local object of the caller as userdata because invalid pointer will be received in GameSpy callbacks after the client's query is arrived.

Author: FreeZoneMods

src/xrGame/gamespy/GameSpy_QR2_callbacks.cpp

@@ -31,7 +31,7 @@ void __cdecl callback_serverkey(int keyid, qr2_buffer_t outbuf, void* userdata)
 {
     if (!userdata)
         return;
-    xrGameSpyServer* pServer = static_cast<CGameSpy_QR2::Context*>(userdata)->GSServer;
+    xrGameSpyServer* pServer = static_cast<xrGameSpyServer*>(userdata);
     if (!pServer)
         return;
     CGameSpy_QR2* pQR2 = pServer->QR2();
@@ -195,7 +195,7 @@ void __cdecl callback_serverkey(int keyid, qr2_buffer_t outbuf, void* userdata)
 
 void __cdecl callback_playerkey(int keyid, int index, qr2_buffer_t outbuf, void* userdata)
 {
-    xrGameSpyServer* pServer = static_cast<CGameSpy_QR2::Context*>(userdata)->GSServer;
+    xrGameSpyServer* pServer = static_cast<xrGameSpyServer*>(userdata);
     if (!pServer)
         return;
     if (u32(index) >= pServer->GetClientsCount())
@@ -262,7 +262,7 @@ void __cdecl callback_playerkey(int keyid, int index, qr2_buffer_t outbuf, void*
 
 void __cdecl callback_teamkey(int keyid, int index, qr2_buffer_t outbuf, void* userdata)
 {
-    xrGameSpyServer* pServer = static_cast<CGameSpy_QR2::Context*>(userdata)->GSServer;
+    xrGameSpyServer* pServer = static_cast<xrGameSpyServer*>(userdata);
     if (!pServer)
         return;
 
@@ -290,7 +290,7 @@ void __cdecl callback_keylist(qr2_key_type keytype, qr2_keybuffer_t keybuffer, v
 {
     if (!userdata)
         return;
-    xrGameSpyServer* pServer = static_cast<CGameSpy_QR2::Context*>(userdata)->GSServer;
+    xrGameSpyServer* pServer = static_cast<xrGameSpyServer*>(userdata);
     CGameSpy_QR2* pQR2 = pServer->QR2();
     if (!pQR2)
         return;
@@ -375,7 +375,7 @@ int __cdecl callback_count(qr2_key_type keytype, void* userdata)
 {
     if (!userdata)
         return 0;
-    xrGameSpyServer* pServer = static_cast<CGameSpy_QR2::Context*>(userdata)->GSServer;
+    xrGameSpyServer* pServer = static_cast<xrGameSpyServer*>(userdata);
     switch (keytype)
     {
     case key_player: { return pServer->GetPlayersCount();
@@ -405,7 +405,7 @@ int __cdecl callback_count(qr2_key_type keytype, void* userdata)
 void __cdecl callback_adderror(qr2_error_t error, gsi_char* errmsg, void* userdata)
 {
     Msg("! Error while adding this server to master list ->%s.", errmsg);
-    xrGameSpyServer* pServer = static_cast<CGameSpy_QR2::Context*>(userdata)->GSServer;
+    xrGameSpyServer* pServer = static_cast<xrGameSpyServer*>(userdata);
     if (pServer)
         pServer->OnError_Add(error);
 };
@@ -416,7 +416,7 @@ void __cdecl callback_cm(char* data, int len, void* userdata){};
 void __cdecl callback_deny_ip(void* userdata, unsigned int sender_ip, int* result)
 {
     *result = 0;
-    IPureServer* pServer = static_cast<CGameSpy_QR2::Context*>(userdata)->GSServer;
+    IPureServer* pServer = static_cast<xrGameSpyServer*>(userdata);
     if (pServer && pServer->IsPlayerIPDenied(static_cast<u32>(sender_ip)))
     {
         *result = 1;
@@ -425,7 +425,7 @@ void __cdecl callback_deny_ip(void* userdata, unsigned int sender_ip, int* resul
 /*
 void __cdecl callback_public(unsigned int ip, unsigned short port, void* userdata)
 {
-    xrGameSpyServer* pServer = static_cast<CGameSpy_QR2::Context *>(userdata)->GSServer;
+    xrGameSpyServer* pServer = static_cast<xrGameSpyServer*>(userdata);
     if (!pServer)
     {
         VERIFY2(pServer, "xrGameSpyServer is NULL");

src/xrGame/xrGameSpy_GameSpyFuncs.cpp

@@ -7,7 +7,7 @@
 // void			xrGameSpyServer::QR2_Init			(u32 PortID)
 void xrGameSpyServer::QR2_Init(int PortID)
 {
-    CGameSpy_QR2::Context ctx;
+    CGameSpy_QR2::SInitConfig ctx;
     ctx.OnServerKey = callback_serverkey;
     ctx.OnPlayerKey = callback_playerkey;
     ctx.OnTeamKey = callback_teamkey;

src/xrGameSpy/GameSpy_QR2.cpp

@@ -85,21 +85,27 @@ void CGameSpy_QR2::RegisterAdditionalKeys()
     qr2_register_keyA(SERVER_UP_TIME_KEY, ("server_up_time"));
 };
 
-bool CGameSpy_QR2::Init(int PortID, int Public, Context& ctx)
-{
-    //--------- QR2 Init -------------------------/
-    // call qr_init with the query port number and gamename, default IP address, and no user data
-
-    //	if (qr2_initA(NULL,NULL,PortID, GAMESPY_GAMENAME, m_SecretKey, Public, 0,
-    qr2_error_t err = xrGS_qr2_initA(NULL, NULL, PortID, Public, 0, ctx.OnServerKey, ctx.OnPlayerKey, ctx.OnTeamKey,
-        ctx.OnKeyList, ctx.OnCount, ctx.OnError, &ctx);
+bool CGameSpy_QR2::Init(int PortID, int Public, SInitConfig& ctx)
+{        
+    qr2_error_t err = xrGS_qr2_initA(nullptr, 
+                                     nullptr, 
+                                     PortID, 
+                                     Public, 
+                                     0, 
+                                     ctx.OnServerKey, 
+                                     ctx.OnPlayerKey, 
+                                     ctx.OnTeamKey,
+                                     ctx.OnKeyList, 
+                                     ctx.OnCount, 
+                                     ctx.OnError, 
+                                     ctx.GSServer);
+        
 #ifndef MASTER_GOLD
     Msg("xrGS::xrGS_qr2_initA returned code is [%d]", err);
 #endif // #ifndef MASTER_GOLD
 
     if (err != e_qrnoerror)
     {
-        //		_tprintf(_T("Error starting query sockets\n"));
         Msg("xrGS::QR2 : Failes to Initialize!");
         return false;
     }
@@ -112,8 +118,7 @@ bool CGameSpy_QR2::Init(int PortID, int Public, Context& ctx)
     // Set a function to be called when we receive a nat negotiation request
     qr2_register_natneg_callback(NULL, ctx.OnNatNeg);
 
-    // Set a function to be called when gamespy responds my IP and port number
-    // qr2_register_publicaddress_callback(NULL, callback_public);
+    // Set a function to be called when gamespy responds my IP and port number    
     qr2_register_denyresponsetoip_callback(NULL, ctx.OnDenyIP);
 
 #ifndef MASTER_GOLD

src/xrGameSpy/GameSpy_QR2.h

@@ -6,7 +6,7 @@ class xrGameSpyServer;
 class XRGAMESPY_API CGameSpy_QR2
 {
 public:
-    class Context
+    struct SInitConfig
     {
     public:
         void(__cdecl* OnServerKey)(int keyid, qr2_buffer_t outbuf, void* userdata);
@@ -25,7 +25,7 @@ class XRGAMESPY_API CGameSpy_QR2
     //	string16	m_SecretKey;
 
 public:
-    bool Init(int PortID, int Public, Context& ctx);
+    bool Init(int PortID, int Public, SInitConfig& ctx);
     void Think(void* qrec);
     void ShutDown(void* qrec);
     void RegisterAdditionalKeys();