fteqw/engine/common/plugin.c

//This file should be easily portable.
//The biggest strength of this plugin system is that ALL interactions are performed via
//named functions, this makes it *really* easy to port plugins from one engine to annother.

#include "quakedef.h"

#ifdef PLUGINS
//#define GNUTLS
#ifdef GNUTLS

#if defined(_WIN32) && !defined(MINGW)


//lets rip stuff out of the header and supply a seperate dll.
//gnutls is huge.
//also this helps get around the whole msvc/mingw thing.

struct DSTRUCT;
typedef struct DSTRUCT* gnutls_certificate_credentials;
typedef gnutls_certificate_credentials gnutls_certificate_client_credentials;
typedef struct DSTRUCT* gnutls_anon_client_credentials;
struct gnutls_session_int;
typedef struct gnutls_session_int* gnutls_session;
typedef void * gnutls_transport_ptr;

typedef enum gnutls_kx_algorithm { GNUTLS_KX_RSA=1, GNUTLS_KX_DHE_DSS, 
	GNUTLS_KX_DHE_RSA, GNUTLS_KX_ANON_DH, GNUTLS_KX_SRP,
	GNUTLS_KX_RSA_EXPORT, GNUTLS_KX_SRP_RSA, GNUTLS_KX_SRP_DSS
} gnutls_kx_algorithm;
typedef enum gnutls_certificate_type { GNUTLS_CRT_X509=1, GNUTLS_CRT_OPENPGP 
} gnutls_certificate_type;
typedef enum gnutls_connection_end { GNUTLS_SERVER=1, GNUTLS_CLIENT } gnutls_connection_end;
typedef enum gnutls_credentials_type { GNUTLS_CRD_CERTIFICATE=1, GNUTLS_CRD_ANON, GNUTLS_CRD_SRP } gnutls_credentials_type;
typedef enum gnutls_close_request { GNUTLS_SHUT_RDWR=0, GNUTLS_SHUT_WR=1 } gnutls_close_request;

#define GNUTLS_E_AGAIN -28
#define GNUTLS_E_INTERRUPTED -52

int (VARGS *gnutls_bye)( gnutls_session session, gnutls_close_request how);
void (VARGS *gnutls_perror)( int error);
int (VARGS *gnutls_handshake)( gnutls_session session);
void (VARGS *gnutls_transport_set_ptr)(gnutls_session session, gnutls_transport_ptr ptr);
int (VARGS *gnutls_certificate_type_set_priority)( gnutls_session session, const int*);
int (VARGS *gnutls_credentials_set)( gnutls_session, gnutls_credentials_type type, void* cred);
int (VARGS *gnutls_kx_set_priority)( gnutls_session session, const int*);
int (VARGS *gnutls_init)(gnutls_session * session, gnutls_connection_end con_end);
int (VARGS *gnutls_set_default_priority)(gnutls_session session);
int (VARGS *gnutls_certificate_allocate_credentials)( gnutls_certificate_credentials *sc);
int (VARGS *gnutls_anon_allocate_client_credentials)( gnutls_anon_client_credentials *sc);
int (VARGS *gnutls_global_init)(void);
int (VARGS *gnutls_record_send)( gnutls_session session, const void *data, size_t sizeofdata);
int (VARGS *gnutls_record_recv)( gnutls_session session, void *data, size_t sizeofdata);

qboolean Init_GNUTLS(void)
{
	HMODULE hmod;
	hmod = LoadLibrary("gnutls.dll");
	if (!hmod)
		return false;

	gnutls_bye = (void*)GetProcAddress(hmod, "gnutls_bye");
	gnutls_perror = (void*)GetProcAddress(hmod, "gnutls_perror");
	gnutls_handshake = (void*)GetProcAddress(hmod, "gnutls_handshake");
	gnutls_transport_set_ptr = (void*)GetProcAddress(hmod, "gnutls_transport_set_ptr");
	gnutls_certificate_type_set_priority = (void*)GetProcAddress(hmod, "gnutls_certificate_type_set_priority");
	gnutls_credentials_set = (void*)GetProcAddress(hmod, "gnutls_credentials_set");
	gnutls_kx_set_priority = (void*)GetProcAddress(hmod, "gnutls_kx_set_priority");
	gnutls_init = (void*)GetProcAddress(hmod, "gnutls_init");
	gnutls_set_default_priority = (void*)GetProcAddress(hmod, "gnutls_set_default_priority");
	gnutls_certificate_allocate_credentials = (void*)GetProcAddress(hmod, "gnutls_certificate_allocate_credentials");
	gnutls_anon_allocate_client_credentials = (void*)GetProcAddress(hmod, "gnutls_anon_allocate_client_credentials");
	gnutls_global_init = (void*)GetProcAddress(hmod, "gnutls_global_init");
	gnutls_record_send = (void*)GetProcAddress(hmod, "gnutls_record_send");
	gnutls_record_recv = (void*)GetProcAddress(hmod, "gnutls_record_recv");

	if (!gnutls_bye || !gnutls_perror || !gnutls_handshake || !gnutls_transport_set_ptr
			|| !gnutls_certificate_type_set_priority || !gnutls_credentials_set
			|| !gnutls_kx_set_priority || !gnutls_init || !gnutls_set_default_priority
			|| !gnutls_certificate_allocate_credentials || !gnutls_anon_allocate_client_credentials
			|| !gnutls_global_init || !gnutls_record_send || !gnutls_record_recv)
	{
		Con_Printf("gnutls.dll doesn't contain all required exports\n");
		FreeLibrary(hmod);
		return false;
	}

	return true;
}

#else
#include <gnutls/gnutls.h>
qboolean Init_GNUTLS(void) {return true;}
#endif

#endif


cvar_t plug_sbar = SCVAR("plug_sbar", "1");
cvar_t plug_loaddefault = SCVAR("plug_loaddefault", "1");

#ifdef RGLQUAKE
#include "glquake.h"
#endif

//custom plugin builtins.
typedef int (VARGS *Plug_Builtin_t)(void *offset, unsigned int mask, const long *arg);
void Plug_RegisterBuiltin(char *name, Plug_Builtin_t bi, int flags);
#define PLUG_BIF_DLLONLY	1
#define PLUG_BIF_QVMONLY	2
#define PLUG_BIF_NEEDSRENDERER 4

#include "netinc.h"

typedef struct plugin_s {
	char *name;
	vm_t *vm;

	int blockcloses;

	int tick;
	int executestring;
#ifndef SERVERONLY
	int conexecutecommand;
	int menufunction;
	int sbarlevel[3];	//0 - main sbar, 1 - supplementry sbar sections (make sure these can be switched off), 2 - overlays (scoreboard). menus kill all.
	int reschange;

	//protocol-in-a-plugin
	int connectionlessclientpacket;
#endif
	int svmsgfunction;
	int chatmsgfunction;
	int centerprintfunction;

	struct plugin_s *next;
} plugin_t;

void Plug_SubConsoleCommand(console_t *con, char *line);

plugin_t *currentplug;



#ifndef SERVERONLY
#include "cl_plugin.inc"
#else
void Plug_Client_Init(void){}
void Plug_Client_Close(plugin_t *plug) {}
#endif


void Plug_Init(void);
void Plug_Close(plugin_t *plug);

void Plug_Tick(void);
qboolean Plugin_ExecuteString(void);
void Plug_Shutdown(void);


static plugin_t *plugs;


typedef struct {
	char *name;
	Plug_Builtin_t func;
	int flags;
} Plug_Plugins_t;
Plug_Plugins_t *plugbuiltins;
int numplugbuiltins;

void Plug_RegisterBuiltin(char *name, Plug_Builtin_t bi, int flags)
{
	//randomize the order a little.
	int newnum;

	newnum = (rand()%128)+1;
	while(newnum < numplugbuiltins && plugbuiltins[newnum].func)
		newnum+=128;

	if (newnum >= numplugbuiltins)
	{
		numplugbuiltins = newnum+128;
		plugbuiltins = BZ_Realloc(plugbuiltins, sizeof(Plug_Plugins_t)*numplugbuiltins);
	}

	//got an empty number.
	Con_DPrintf("%s: %i\n", name, newnum);
	plugbuiltins[newnum].name = name;
	plugbuiltins[newnum].func = bi;
	plugbuiltins[newnum].flags = flags;
}

/*
static void Plug_RegisterBuiltinIndex(char *name, Plug_Builtin_t bi, int flags, int index)	//I d
{
	//randomize the order a little.
	int newnum;

	newnum = rand()%128;
	while(newnum+1 < numplugbuiltins && plugbuiltins[newnum+1].func)
		newnum+=128;

	newnum++;

	if (newnum >= numplugbuiltins)
	{
		numplugbuiltins = newnum+128;
		plugbuiltins = BZ_Realloc(plugbuiltins, sizeof(Plug_Plugins_t)*numplugbuiltins);
	}

	//got an empty number.
	plugbuiltins[newnum].name = name;
	plugbuiltins[newnum].func = bi;
}
*/

int VARGS Plug_FindBuiltin(void *offset, unsigned int mask, const long *args)
{
	int i;
	for (i = 0; i < numplugbuiltins; i++)
		if (plugbuiltins[i].name)
			if (!strcmp(plugbuiltins[i].name, (char *)VM_POINTER(args[0])))
			{
				if (offset && plugbuiltins[i].flags & PLUG_BIF_DLLONLY)
					return 0;	//block it, if not native
				if (!offset && plugbuiltins[i].flags & PLUG_BIF_QVMONLY)
					return 0;	//block it, if not native
				return -i;
			}

	return 0;
}

long Plug_SystemCallsEx(void *offset, unsigned int mask, int fn, const long *arg)
{
	fn = fn+1;

	if (fn>=0 && fn < numplugbuiltins && plugbuiltins[fn].func!=NULL)
		return plugbuiltins[fn].func(offset, mask, arg);

	Sys_Error("QVM Plugin tried calling invalid builtin %i", fn);
	return 0;
}

#ifdef _DEBUG
static long Plug_SystemCallsExWrapper(void *offset, unsigned int mask, int fn, const long *arg)
{	//this is so we can use edit and continue properly (vc doesn't like function pointers for edit+continue)
	return Plug_SystemCallsEx(offset, mask, fn, arg);
}
#define Plug_SystemCallsEx Plug_SystemCallsExWrapper
#endif

//I'm not keen on this.
//but dlls call it without saying what sort of vm it comes from, so I've got to have them as specifics
static int EXPORT_FN Plug_SystemCalls(int arg, ...)
{
	long args[9];
	va_list argptr;

	va_start(argptr, arg);
	args[0]=va_arg(argptr, int);
	args[1]=va_arg(argptr, int);
	args[2]=va_arg(argptr, int);
	args[3]=va_arg(argptr, int);
	args[4]=va_arg(argptr, int);
	args[5]=va_arg(argptr, int);
	args[6]=va_arg(argptr, int);
	args[7]=va_arg(argptr, int);
	args[8]=va_arg(argptr, int);
	va_end(argptr);

	arg = -arg;

	if (arg>=0 && arg < numplugbuiltins && plugbuiltins[arg].func)
		return plugbuiltins[arg].func(NULL, ~0, args);

	Sys_Error("DLL Plugin tried calling invalid biultin %i", arg);
	return 0;
}


plugin_t *Plug_Load(char *file)
{
	plugin_t *newplug;
	long argarray;

	for (newplug = plugs; newplug; newplug = newplug->next)
	{
		if (!stricmp(newplug->name, file))
			return newplug;
	}

	newplug = Z_Malloc(sizeof(plugin_t)+strlen(file)+1);
	newplug->name = (char*)(newplug+1);
	strcpy(newplug->name, file);

	newplug->vm = VM_Create(NULL, file, Plug_SystemCalls, Plug_SystemCallsEx);
	currentplug = newplug;
	if (newplug->vm)
	{
		Con_Printf("Created plugin %s\n", file);

		newplug->next = plugs;
		plugs = newplug;

		argarray = 4;
		if (!VM_Call(newplug->vm, 0, Plug_FindBuiltin("Plug_GetEngineFunction"-4, ~0, &argarray)))
		{
			Plug_Close(newplug);
			return NULL;
		}

#ifndef SERVERONLY
		if (newplug->reschange)
			VM_Call(newplug->vm, newplug->reschange, vid.width, vid.height);
#endif
	}
	else
	{
		Z_Free(newplug);
		newplug = NULL;
	}
	currentplug = NULL;

	return newplug;
}

int Plug_Emumerated (char *name, int size, void *param)
{
	char vmname[MAX_QPATH];
	strcpy(vmname, name);
	vmname[strlen(vmname) - strlen(param)] = '\0';
	if (!Plug_Load(vmname))
		Con_Printf("Couldn't load plugin %s\n", vmname);

	return true;
}

int VARGS Plug_Con_Print(void *offset, unsigned int mask, const long *arg)
{
	if (qrenderer <= 0)
		return false;
	Con_Printf("%s", (char*)VM_POINTER(arg[0]));
	return 0;
}
int VARGS Plug_Sys_Error(void *offset, unsigned int mask, const long *arg)
{
	Sys_Error("%s", (char*)offset+arg[0]);
	return 0;
}
int VARGS Plug_Sys_Milliseconds(void *offset, unsigned int mask, const long *arg)
{
	return Sys_DoubleTime()*1000;
}
int VARGS Plug_ExportToEngine(void *offset, unsigned int mask, const long *arg)
{
	char *name = (char*)VM_POINTER(arg[0]);
	if (!strcmp(name, "Tick"))
		currentplug->tick = arg[1];
	else if (!strcmp(name, "ExecuteCommand"))
		currentplug->executestring = arg[1];
#ifndef SERVERONLY
	else if (!strcmp(name, "ConExecuteCommand"))
		currentplug->conexecutecommand = arg[1];
	else if (!strcmp(name, "MenuEvent"))
		currentplug->menufunction = arg[1];
	else if (!strcmp(name, "UpdateVideo"))
		currentplug->reschange = arg[1];
	else if (!strcmp(name, "SbarBase"))			//basic SBAR.
		currentplug->sbarlevel[0] = arg[1];
	else if (!strcmp(name, "SbarSupplement"))	//supplementry stuff - teamplay
		currentplug->sbarlevel[1] = arg[1];
	else if (!strcmp(name, "SbarOverlay"))		//overlay - scoreboard type stuff.
		currentplug->sbarlevel[2] = arg[1];
	else if (!strcmp(name, "ConnectionlessClientPacket"))
		currentplug->connectionlessclientpacket = arg[1];
	else if (!strcmp(name, "ServerMessageEvent"))
		currentplug->svmsgfunction = arg[1];
	else if (!strcmp(name, "ChatMessageEvent"))
		currentplug->chatmsgfunction = arg[1];
	else if (!strcmp(name, "CenterPrintMessage"))
		currentplug->centerprintfunction = arg[1];
#endif
	else
		return 0;
	return 1;
}

//retrieve a plugin's name
int VARGS Plug_GetPluginName(void *offset, unsigned int mask, const long *arg)
{
	int plugnum = VM_LONG(arg[0]);
	plugin_t *plug;
	//int plugnum (0 for current), char *buffer, int bufferlen

	if (VM_OOB(arg[1], arg[2]))
		return false;

	if (plugnum <= 0)
	{
		Q_strncpyz(VM_POINTER(arg[1]), currentplug->name, VM_LONG(arg[2]));
		return true;
	}

	for (plug = plugs; plug; plug = plug->next)
	{
		if (--plugnum == 0)
		{
			Q_strncpyz(VM_POINTER(arg[1]), plug->name, VM_LONG(arg[2]));
			return true;
		}
	}
	return false;
}

typedef void (*funcptr_t) ();
int VARGS Plug_ExportNative(void *offset, unsigned int mask, const long *arg)
{
	funcptr_t func;
	char *name = (char*)VM_POINTER(arg[0]);
	arg++;

	func = *(funcptr_t*)arg;

	if (!strcmp(name, "UnsafeClose"))
	{
		//not used by the engine, but stops the user from being able to unload the plugin.
		//this is useful for certain things, like if the plugin uses some external networking or direct disk access or whatever.
		currentplug->blockcloses++;
	}
	/*
	else if (!strncmp(name, "FS_LoadModule"))	//module as in pak/pk3
	{
		FS_RegisterModuleDriver(name + 13, func);
		currentplug->blockcloses++;
	}
	*/
	/*
	else if (!strncmp(name, "S_OutputDriver"))	//a sound driver (takes higher priority over the built-in ones)
	{
		S_RegisterOutputDriver(name + 13, func);
		currentplug->blockcloses++;
	}
	*/
	/*
	else if (!strncmp(name, "VID_DisplayDriver"))	//a video driver, loaded by name as given by vid_renderer
	{
		FS_RegisterModuleDriver(, func);
		currentplug->blockcloses++;
	}
	*/

#ifndef SERVERONLY
	else if (!strcmp(name, "S_LoadSound"))	//a hook for loading extra types of sound (wav, mp3, ogg, midi, whatever you choose to support)
	{
		S_RegisterSoundInputPlugin((void*)func);
		currentplug->blockcloses++;
	}
#endif
	else
		return 0;
	return 1;
}

typedef struct {
	//Make SURE that the engine has resolved all cvar pointers into globals before this happens.
	plugin_t *plugin;
	cvar_t *var;
} plugincvararray_t;
int plugincvararraylen;
plugincvararray_t *plugincvararray;
//qhandle_t Cvar_Register (char *name, char *defaultval, int flags, char *grouphint);
int VARGS Plug_Cvar_Register(void *offset, unsigned int mask, const long *arg)
{
	char *name = VM_POINTER(arg[0]);
	char *defaultvalue = VM_POINTER(arg[1]);
	unsigned int flags = VM_LONG(arg[2]);
	char *groupname = VM_POINTER(arg[3]);
	cvar_t *var;
	int i;

	var = Cvar_Get(name, defaultvalue, flags&1, groupname);

	for (i = 0; i < plugincvararraylen; i++)
	{
		if (!plugincvararray[i].var)
		{	//hmm... a gap...
			plugincvararray[i].plugin = currentplug;
			plugincvararray[i].var = var;
			return i;
		}
	}

	plugincvararray = BZ_Realloc(plugincvararray, (plugincvararraylen+1)*sizeof(plugincvararray_t));
	plugincvararray[plugincvararraylen].plugin = currentplug;
	plugincvararray[plugincvararraylen].var = var;
	plugincvararraylen++;
	return plugincvararraylen-1;
}
//int Cvar_Update, (qhandle_t handle, int modificationcount, char *stringv, float *floatv));	//stringv is 256 chars long, don't expect this function to do anything if modification count is unchanged.
int VARGS Plug_Cvar_Update(void *offset, unsigned int mask, const long *arg)
{
	int handle;
	int modcount;
	char *stringv;	//255 bytes long.
	float *floatv;
	cvar_t *var;
	handle = VM_LONG(arg[0]);
	if (handle < 0 || handle >= plugincvararraylen)
		return 0;
	if (plugincvararray[handle].plugin != currentplug)
		return 0;	//I'm not letting you know what annother plugin has registered.

	if (VM_OOB(arg[2], 256) || VM_OOB(arg[3], 4))	//Oi, plugin - you screwed up
		return 0;

	modcount = VM_LONG(arg[1]);
	stringv = VM_POINTER(arg[2]);
	floatv = VM_POINTER(arg[3]);

	var = plugincvararray[handle].var;


	strcpy(stringv, var->string);
	*floatv = var->value;

	return var->modified;
}

//void Cmd_Args(char *buffer, int buffersize)
int VARGS Plug_Cmd_Args(void *offset, unsigned int mask, const long *arg)
{
	char *buffer = (char*)VM_POINTER(arg[0]);
	char *args;
	args = Cmd_Args();
	if (strlen(args)+1>arg[1])
		return 0;
	strcpy(buffer, args);
	return 1;
}
//void Cmd_Argv(int num, char *buffer, int buffersize)
int VARGS Plug_Cmd_Argv(void *offset, unsigned int mask, const long *arg)
{
	char *buffer = (char*)VM_POINTER(arg[1]);
	char *args;
	args = Cmd_Argv(arg[0]);
	if (strlen(args)+1>arg[2])
		return 0;
	strcpy(buffer, args);
	return 1;
}
//int Cmd_Argc(void)
int VARGS Plug_Cmd_Argc(void *offset, unsigned int mask, const long *arg)
{
	return Cmd_Argc();
}

//void Cvar_SetString (char *name, char *value);
int VARGS Plug_Cvar_SetString(void *offset, unsigned int mask, const long *arg)
{
	char *name = VM_POINTER(arg[0]),
		*value = VM_POINTER(arg[1]);
	cvar_t *var = Cvar_Get(name, value, 0, "Plugin vars");
	if (var)
	{
		Cvar_Set(var, value);
		return 1;
	}

	return 0;
}

//void Cvar_SetFloat (char *name, float value);
int VARGS Plug_Cvar_SetFloat(void *offset, unsigned int mask, const long *arg)
{
	char *name = VM_POINTER(arg[0]);
	float value = VM_FLOAT(arg[1]);
	cvar_t *var = Cvar_Get(name, "", 0, "Plugin vars");	//"" because I'm lazy
	if (var)
	{
		Cvar_SetValue(var, value);
		return 1;
	}

	return 0;
}

//void Cvar_GetFloat (char *name);
int VARGS Plug_Cvar_GetFloat(void *offset, unsigned int mask, const long *arg)
{
	char *name = VM_POINTER(arg[0]);
	int ret;
	cvar_t *var = Cvar_Get(name, "", 0, "Plugin vars");
	if (var)
	{
		VM_FLOAT(ret) = var->value;
	}
	else
		VM_FLOAT(ret) = 0;
	return ret;
}

//qboolean Cvar_GetString (char *name, char *retstring, int sizeofretstring);
int VARGS Plug_Cvar_GetString(void *offset, unsigned int mask, const long *arg)
{
	char *name, *ret;
	int retsize;
	cvar_t *var;
	if (VM_OOB(arg[1], arg[2]))
	{
		return false;
	}

	name = VM_POINTER(arg[0]);
	ret = VM_POINTER(arg[1]);
	retsize = VM_LONG(arg[2]);


	var = Cvar_Get(name, "", 0, "Plugin vars");
	if (strlen(var->name)+1 > retsize)
		return false;

	strcpy(ret, var->string);

	return true;
}

//void Cmd_AddText (char *text, qboolean insert);	//abort the entire engine.
int VARGS Plug_Cmd_AddText(void *offset, unsigned int mask, const long *arg)
{
	if (VM_LONG(arg[1]))
		Cbuf_InsertText(VM_POINTER(arg[0]), RESTRICT_LOCAL, false);
	else
		Cbuf_AddText(VM_POINTER(arg[0]), RESTRICT_LOCAL);

	return 1;
}

int plugincommandarraylen;
typedef struct {
	plugin_t *plugin;
	char command[64];
} plugincommand_t;
plugincommand_t *plugincommandarray;
void Plug_Command_f(void)
{
	int i;
	char *cmd = Cmd_Argv(0);
	plugin_t *oldplug = currentplug;
	for (i = 0; i < plugincommandarraylen; i++)
	{
		if (!plugincommandarray[i].plugin)
			continue;	//don't check commands who's owners died.

		if (stricmp(plugincommandarray[i].command, cmd))	//not the right command
			continue;

		currentplug = plugincommandarray[i].plugin;

		if (currentplug->executestring)
			VM_Call(currentplug->vm, currentplug->executestring, 0);
		break;
	}

	currentplug = oldplug;
}

int VARGS Plug_Cmd_AddCommand(void *offset, unsigned int mask, const long *arg)
{
	int i;
	char *name = VM_POINTER(arg[0]);
	for (i = 0; i < plugincommandarraylen; i++)
	{
		if (!plugincommandarray[i].plugin)
			break;
		if (plugincommandarray[i].plugin == currentplug)
		{
			if (!strcmp(name, plugincommandarray[i].command))
				break;
		}
	}
	if (i == plugincommandarraylen)
	{
		plugincommandarraylen++;
		plugincommandarray = BZ_Realloc(plugincommandarray, plugincommandarraylen*sizeof(plugincommand_t));
	}

	Q_strncpyz(plugincommandarray[i].command, name, sizeof(plugincommandarray[i].command));
	if (!Cmd_AddRemCommand(plugincommandarray[i].command, Plug_Command_f))
		return false;
	plugincommandarray[i].plugin = currentplug;	//worked
	return true;
}
void VARGS Plug_FreeConCommands(plugin_t *plug)
{
	int i;
	for (i = 0; i < plugincommandarraylen; i++)
	{
		if (plugincommandarray[i].plugin == plug)
		{
			plugincommandarray[i].plugin = NULL;
			Cmd_RemoveCommand(plugincommandarray[i].command);
		}
	}
}

typedef enum{
	STREAM_NONE,
	STREAM_SOCKET,
	STREAM_TLS,
	STREAM_OSFILE,
	STREAM_FILE
} plugstream_e;

typedef struct {
	plugin_t *plugin;
	plugstream_e type;
	int socket;
	struct {
		char filename[MAX_QPATH];
		qbyte *buffer;
		int buflen;
		int curlen;
		int curpos;
	} file;
#ifdef GNUTLS
	gnutls_session session;
#endif
} pluginstream_t;
pluginstream_t *pluginstreamarray;
int pluginstreamarraylen;

int Plug_NewStreamHandle(plugstream_e type)
{
	int i;
	for (i = 0; i < pluginstreamarraylen; i++)
	{
		if (!pluginstreamarray[i].plugin)
			break;
	}
	if (i == pluginstreamarraylen)
	{
		pluginstreamarraylen++;
		pluginstreamarray = BZ_Realloc(pluginstreamarray, pluginstreamarraylen*sizeof(pluginstream_t));
	}

	memset(&pluginstreamarray[i], 0, sizeof(pluginstream_t));
	pluginstreamarray[i].plugin = currentplug;
	pluginstreamarray[i].type = type;
	pluginstreamarray[i].socket = -1;
	pluginstreamarray[i].file.buffer = NULL;
	*pluginstreamarray[i].file.filename = '\0';

	return i;
}

//EBUILTIN(int, NET_TCPListen, (char *ip, int port, int maxcount));
//returns a new socket with listen enabled.
int VARGS Plug_Net_TCPListen(void *offset, unsigned int mask, const long *arg)
{
	int handle;
	int sock;
	struct sockaddr_qstorage address;
	int _true = 1;

	char *localip = VM_POINTER(arg[0]);
	unsigned short localport = VM_LONG(arg[1]);
	int maxcount = VM_LONG(arg[2]);

	netadr_t a;
	if (localip)
	{
		if (!NET_StringToAdr(localip, &a))
			return -1;
		NetadrToSockadr(&a, &address);
	}
	else
	{
		memset(&address, 0, sizeof(address));
		((struct sockaddr_in*)&address)->sin_family = AF_INET;
	}

	if (((struct sockaddr_in*)&address)->sin_family == AF_INET && !((struct sockaddr_in*)&address)->sin_port)
		((struct sockaddr_in*)&address)->sin_port = htons(localport);
#ifdef IPPROTO_IPV6
	else if (((struct sockaddr_in6*)&address)->sin6_family == AF_INET6 && !((struct sockaddr_in6*)&address)->sin6_port)
		((struct sockaddr_in6*)&address)->sin6_port = htons(localport);
#endif

	if ((sock = socket(((struct sockaddr*)&address)->sa_family, SOCK_STREAM, 0)) == -1)
	{
		Con_Printf("Failed to create socket\n");
		return -2;
	}
	if (ioctlsocket (sock, FIONBIO, &_true) == -1)
	{
		closesocket(sock);
		return -2;
	}

	if( bind (sock, (void *)&address, sizeof(address)) == -1)
	{
		closesocket(sock);
		return -2;
	}
	if( listen (sock, maxcount) == -1)
	{
		closesocket(sock);
		return -2;
	}

	handle = Plug_NewStreamHandle(STREAM_SOCKET);
	pluginstreamarray[handle].socket = sock;

	return handle;

}
int VARGS Plug_Net_Accept(void *offset, unsigned int mask, const long *arg)
{
	int handle = VM_LONG(arg[0]);
	struct sockaddr_in address;
	int addrlen;
	int sock;
	int _true = 1;

	if (handle < 0 || handle >= pluginstreamarraylen || pluginstreamarray[handle].plugin != currentplug || pluginstreamarray[handle].type != STREAM_SOCKET)
		return -2;
	sock = pluginstreamarray[handle].socket;

	addrlen = sizeof(address);
	sock = accept(sock, (struct sockaddr *)&address, &addrlen);

	if (sock < 0)
		return -1;

	if (ioctlsocket (sock, FIONBIO, &_true) == -1)	//now make it non blocking.
	{
		closesocket(sock);
		return -1;
	}

	if (arg[2] && !VM_OOB(arg[1], arg[2]))
	{
		netadr_t a;
		char *s;
		SockadrToNetadr((struct sockaddr_qstorage *)&address, &a);
		s = NET_AdrToString(a);
		Q_strncpyz(VM_POINTER(arg[1]), s, addrlen);
	}

	handle = Plug_NewStreamHandle(STREAM_SOCKET);
	pluginstreamarray[handle].socket = sock;

	return handle;
}
//EBUILTIN(int, NET_TCPConnect, (char *ip, int port));
int VARGS Plug_Net_TCPConnect(void *offset, unsigned int mask, const long *arg)
{
	char *localip = VM_POINTER(arg[0]);
	unsigned short localport = VM_LONG(arg[1]);

	int handle;
	struct sockaddr_qstorage to, from;
	int sock;
	int _true = 1;

	netadr_t a;

	if (!NET_StringToAdr(localip, &a))
		return -1;
	NetadrToSockadr(&a, &to);
	if (((struct sockaddr_in*)&to)->sin_family == AF_INET && !((struct sockaddr_in*)&to)->sin_port)
		((struct sockaddr_in*)&to)->sin_port = htons(localport);
#ifdef IPPROTO_IPV6
	else if (((struct sockaddr_in6*)&to)->sin6_family == AF_INET6 && !((struct sockaddr_in6*)&to)->sin6_port)
		((struct sockaddr_in6*)&to)->sin6_port = htons(localport);
#endif


	if ((sock = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP)) == -1)
	{
		return -2;
	}

	memset(&from, 0, sizeof(from));
	((struct sockaddr*)&from)->sa_family = ((struct sockaddr*)&to)->sa_family;
	if (bind(sock, (struct sockaddr *)&from, sizeof(from)) == -1)
	{
		return -2;
	}

	//not yet blocking. So no frequent attempts please...
	//non blocking prevents connect from returning worthwhile sensible value.
	if (connect(sock, (struct sockaddr *)&to, sizeof(to)) == -1)
	{
		closesocket(sock);
		return -2;
	}

	if (ioctlsocket (sock, FIONBIO, &_true) == -1)	//now make it non blocking.
	{
		return -1;
	}

	handle = Plug_NewStreamHandle(STREAM_SOCKET);
	pluginstreamarray[handle].socket = sock;

	return handle;
}

#ifdef GNUTLS

int VARGS Plug_Net_SetTLSClient(void *offset, unsigned int mask, const long *arg)
{
	static gnutls_anon_client_credentials anoncred;
	static gnutls_certificate_credentials xcred;

	int ret;

	long _false = false;
	long _true = true;

  /* Need to enable anonymous KX specifically. */
	const int kx_prio[] = {GNUTLS_KX_ANON_DH, 0};
	const int cert_type_priority[3] = {GNUTLS_CRT_X509, GNUTLS_CRT_OPENPGP, 0};


	pluginstream_t *stream;
	int handle = VM_LONG(arg[0]);
	qboolean anon = false;
	if (handle < 0 || handle >= pluginstreamarraylen || pluginstreamarray[handle].plugin != currentplug)
	{
		Con_Printf("Plug_Net_SetTLSClient: socket does not belong to you (or is invalid)\n");
		return -2;
	}
	stream = &pluginstreamarray[handle];
	if (stream->type != STREAM_SOCKET)
	{	//not a socket - invalid
		Con_Printf("Plug_Net_SetTLSClient: Not a socket handle\n");
		return -2;
	}


{
	static qboolean needinit = true;
	if (needinit)
	{
		gnutls_global_init ();

		gnutls_anon_allocate_client_credentials (&anoncred);
		gnutls_certificate_allocate_credentials (&xcred);
//		gnutls_certificate_set_x509_trust_file (xcred, "ca.pem", GNUTLS_X509_FMT_PEM);

		needinit = false;
	}
}

	stream->type = STREAM_TLS;

	// Initialize TLS session
	gnutls_init (&stream->session, GNUTLS_CLIENT);

	// Use default priorities
	gnutls_set_default_priority (stream->session);
	if (anon)
	{
		gnutls_kx_set_priority (stream->session, kx_prio);
		gnutls_credentials_set (stream->session, GNUTLS_CRD_ANON, anoncred);
	}
	else
	{
		gnutls_certificate_type_set_priority (stream->session, cert_type_priority);
		gnutls_credentials_set (stream->session, GNUTLS_CRD_CERTIFICATE, xcred);
	}

	// connect to the peer
	gnutls_transport_set_ptr (stream->session, (gnutls_transport_ptr) stream->socket);

	// Perform the TLS handshake

	ioctlsocket (stream->socket, FIONBIO, &_false);

	ret = GNUTLS_E_AGAIN;
	while ((ret == GNUTLS_E_AGAIN) || (ret == GNUTLS_E_INTERRUPTED))
	{
		ret = gnutls_handshake (stream->session);
	}

	if (ret < 0)
	{
		Con_Printf (S_ERROR "*** TLS handshake failed\n");
		gnutls_perror (ret);

		stream->type = STREAM_SOCKET;	//go back to regular socket
		gnutls_bye (pluginstreamarray[handle].session, GNUTLS_SHUT_RDWR);

		return -2;
	}

	ioctlsocket (stream->socket, FIONBIO, &_true);



	return 0;
}
#endif

int VARGS Plug_FS_Open(void *offset, unsigned int mask, const long *arg)
{
	//modes:
	//1: read
	//2: write

	//char *name, int *handle, int mode

	//return value is length of the file.

	int handle;
	int *ret;
	char *data;

	if (VM_OOB(arg[1], sizeof(int)))
		return -2;
	ret = VM_POINTER(arg[1]);

	if (arg[2] == 1)
	{
		data = COM_LoadMallocFile(VM_POINTER(arg[0]));
		if (!data)
			return -1;

		handle = Plug_NewStreamHandle(STREAM_FILE);
		pluginstreamarray[handle].file.buffer = data;
		pluginstreamarray[handle].file.curpos = 0;
		pluginstreamarray[handle].file.curlen = com_filesize;
		pluginstreamarray[handle].file.buflen = com_filesize;

		*ret = handle;

		return com_filesize;
	}
	else if (arg[2] == 2)
	{
		data = BZ_Malloc(8192);
		if (!data)
			return -1;

		handle = Plug_NewStreamHandle(STREAM_FILE);
		Q_strncpyz(pluginstreamarray[handle].file.filename, VM_POINTER(arg[0]), MAX_QPATH);
		pluginstreamarray[handle].file.buffer = data;
		pluginstreamarray[handle].file.curpos = 0;
		pluginstreamarray[handle].file.curlen = 0;
		pluginstreamarray[handle].file.buflen = 8192;

		*ret = handle;

		return com_filesize;
	}
	else
		return -2;
}

int VARGS Plug_memset(void *offset, unsigned int mask, const long *arg)
{
	if (VM_OOB(arg[0], arg[2]))
		return false;

	memset(VM_POINTER(arg[0]), VM_LONG(arg[1]), VM_LONG(arg[2]));
	return arg[0];
}
int VARGS Plug_memcpy(void *offset, unsigned int mask, const long *arg)
{
	if (VM_OOB(arg[0], arg[2]))
		return false;
	if (VM_OOB(arg[1], arg[2]))
		return false;

	memcpy(VM_POINTER(arg[0]), VM_POINTER(arg[1]), VM_LONG(arg[2]));
	return arg[0];
}
int VARGS Plug_memmove(void *offset, unsigned int mask, const long *arg)
{
	if (VM_OOB(arg[0], arg[2]))
		return false;
	if (VM_OOB(arg[1], arg[2]))
		return false;

	memmove(VM_POINTER(arg[0]), VM_POINTER(arg[1]), VM_LONG(arg[2]));
	return arg[0];
}

int VARGS Plug_sqrt(void *offset, unsigned int mask, const long *arg)
{
	int ret;
	VM_FLOAT(ret) = sqrt(VM_FLOAT(arg[0]));
	return ret;
}
int VARGS Plug_sin(void *offset, unsigned int mask, const long *arg)
{
	int ret;
	VM_FLOAT(ret) = sin(VM_FLOAT(arg[0]));
	return ret;
}
int VARGS Plug_cos(void *offset, unsigned int mask, const long *arg)
{
	int ret;
	VM_FLOAT(ret) = cos(VM_FLOAT(arg[0]));
	return ret;
}
int VARGS Plug_atan2(void *offset, unsigned int mask, const long *arg)
{
	int ret;
	VM_FLOAT(ret) = atan2(VM_FLOAT(arg[0]), VM_FLOAT(arg[1]));
	return ret;
}

int VARGS Plug_Net_Recv(void *offset, unsigned int mask, const long *arg)
{
	int read;
	int handle = VM_LONG(arg[0]);
	void *dest = VM_POINTER(arg[1]);
	int destlen = VM_LONG(arg[2]);

	if (VM_OOB(arg[1], arg[2]))
		return -2;

	if (handle < 0 || handle >= pluginstreamarraylen || pluginstreamarray[handle].plugin != currentplug)
		return -2;
	switch(pluginstreamarray[handle].type)
	{
	case STREAM_SOCKET:
		read = recv(pluginstreamarray[handle].socket, dest, destlen, 0);
		if (read < 0)
		{
			if (qerrno == EWOULDBLOCK)
				return -1;
			else
				return -2;
		}
		else if (read == 0)
			return -2;	//closed by remote connection.
		return read;
#ifdef GNUTLS
	case STREAM_TLS:
		read = gnutls_record_recv(pluginstreamarray[handle].session, dest, destlen);
		if (read < 0)
		{
			if (read == GNUTLS_E_AGAIN || read == -9)
				return -1;
			else
			{
				Con_Printf("TLS Read Error %i (bufsize %i)\n", read, destlen);
				return -2;
			}
		}
		else if (read == 0)
			return -2;	//closed by remote connection.
		return read;
#endif
	case STREAM_FILE:
		if (pluginstreamarray[handle].file.curlen - pluginstreamarray[handle].file.curpos < destlen)
		{
			destlen = pluginstreamarray[handle].file.curlen - pluginstreamarray[handle].file.curpos;
			if (destlen < 0)
				return -2;
		}
		memcpy(dest, pluginstreamarray[handle].file.buffer + pluginstreamarray[handle].file.curpos, destlen);
		pluginstreamarray[handle].file.curpos += destlen;
		return destlen;
	default:
		return -2;
	}
}
int VARGS Plug_Net_Send(void *offset, unsigned int mask, const long *arg)
{
	int written;
	int handle = VM_LONG(arg[0]);
	void *src = VM_POINTER(arg[1]);
	int srclen = VM_LONG(arg[2]);
	if (handle < 0 || handle >= pluginstreamarraylen || pluginstreamarray[handle].plugin != currentplug)
		return -2;
	switch(pluginstreamarray[handle].type)
	{
	case STREAM_SOCKET:
		written = send(pluginstreamarray[handle].socket, src, srclen, 0);
		if (written < 0)
		{
			if (qerrno == EWOULDBLOCK)
				return -1;
			else
				return -2;
		}
		else if (written == 0)
			return -2;	//closed by remote connection.
		return written;
#ifdef GNUTLS
	case STREAM_TLS:
		written = gnutls_record_send(pluginstreamarray[handle].session, src, srclen);
		if (written < 0)
		{
			if (written == GNUTLS_E_AGAIN || written == GNUTLS_E_INTERRUPTED)
				return -1;
			else
			{
				Con_Printf("TLS Send Error %i (%i bytes)\n", written, srclen);
				return -2;
			}
		}
		else if (written == 0)
			return -2;	//closed by remote connection.
		return written;
#endif
	case STREAM_FILE:
		if (pluginstreamarray[handle].file.buflen < pluginstreamarray[handle].file.curpos + srclen)
		{
			pluginstreamarray[handle].file.buflen = pluginstreamarray[handle].file.curpos + srclen+8192;
			pluginstreamarray[handle].file.buffer =
				BZ_Realloc(pluginstreamarray[handle].file.buffer, pluginstreamarray[handle].file.buflen);
		}
		memcpy(pluginstreamarray[handle].file.buffer + pluginstreamarray[handle].file.curpos, src, srclen);
		pluginstreamarray[handle].file.curpos += srclen;
		if (pluginstreamarray[handle].file.curpos > pluginstreamarray[handle].file.curlen)
			pluginstreamarray[handle].file.curlen = pluginstreamarray[handle].file.curpos;
		return -2;

	default:
		return -2;
	}
}
int VARGS Plug_Net_SendTo(void *offset, unsigned int mask, const long *arg)
{
	int written;
	int handle = VM_LONG(arg[0]);
	void *src = VM_POINTER(arg[1]);
	int srclen = VM_LONG(arg[2]);

	netadr_t *address = VM_POINTER(arg[3]);


	struct sockaddr_qstorage sockaddr;
	if (handle == -1)
	{
		NET_SendPacket(NS_CLIENT, srclen, src, *address);
		return srclen;
	}

	NetadrToSockadr(address, &sockaddr);

	if (handle < 0 || handle >= pluginstreamarraylen || pluginstreamarray[handle].plugin != currentplug)
		return -2;
	switch(pluginstreamarray[handle].type)
	{
	case STREAM_SOCKET:
		written = sendto(pluginstreamarray[handle].socket, src, srclen, 0, (struct sockaddr*)&sockaddr, sizeof(sockaddr));
		if (written < 0)
		{
			if (qerrno == EWOULDBLOCK)
				return -1;
			else
				return -2;
		}
		else if (written == 0)
			return -2;	//closed by remote connection.
		return written;
	default:
		return -2;
	}
}

void Plug_Net_Close_Internal(int handle)
{
	switch(pluginstreamarray[handle].type)
	{
#ifdef GNUTLS
	case STREAM_TLS:
		gnutls_bye (pluginstreamarray[handle].session, GNUTLS_SHUT_RDWR);
		pluginstreamarray[handle].type = STREAM_SOCKET;
		Plug_Net_Close_Internal(handle);
		return;
#endif
	case STREAM_SOCKET:
		closesocket(pluginstreamarray[handle].socket);
		break;
	case STREAM_FILE:
		if (*pluginstreamarray[handle].file.filename)
			COM_WriteFile(pluginstreamarray[handle].file.filename, pluginstreamarray[handle].file.buffer, pluginstreamarray[handle].file.curlen);
		BZ_Free(pluginstreamarray[handle].file.buffer);
		break;
	}

	pluginstreamarray[handle].plugin = NULL;
}
int VARGS Plug_Net_Close(void *offset, unsigned int mask, const long *arg)
{
	int handle = VM_LONG(arg[0]);
	if (handle < 0 || handle >= pluginstreamarraylen || pluginstreamarray[handle].plugin != currentplug)
		return -2;

	Plug_Net_Close_Internal(handle);
	return 0;
}

void Plug_CloseAll_f(void);
void Plug_List_f(void);
void Plug_Close_f(void);
void Plug_Load_f(void)
{
	char *plugin;
	plugin = Cmd_Argv(1);
	if (!*plugin)
	{
		Con_Printf("Loads a plugin\n");
		Con_Printf("plug_load [pluginpath]\n");
		Con_Printf("example pluginpath: plugins/blah\n");
		Con_Printf("will load blahx86.dll or blah.so\n");
		return;
	}
	if (!Plug_Load(plugin))
	{
		if (!Plug_Load(va("plugins/%s", plugin)))
			Con_Printf("Couldn't load plugin %s\n", Cmd_Argv(1));
	}
}
/*
static long Test_SysCalls_Ex(void *offset, unsigned int mask, int fn, const long *arg)
{
	switch(fn)
	{
	case 1:
		Con_Printf("%s", VM_POINTER(arg[0]));
		break;
	default:
		Con_Printf("Can't handle %i\n", fn);
	}
	return 0;
}
static int EXPORT_FN Test_SysCalls(int arg, ...)
{
	return 0;
}
void VM_Test_f(void)
{
	vm_t *vm;
	vm = VM_Create(NULL, "vm/test", Test_SysCalls, Test_SysCalls_Ex);
	if (vm)
	{
		VM_Call(vm, 0, "");
		VM_Destroy(vm);
	}
}*/

void Plug_Init(void)
{
//	Cmd_AddCommand("testvm", VM_Test_f);

	Cvar_Register(&plug_sbar, "plugins");
	Cvar_Register(&plug_loaddefault, "plugins");
	Cmd_AddCommand("plug_closeall", Plug_CloseAll_f);
	Cmd_AddCommand("plug_close", Plug_Close_f);
	Cmd_AddCommand("plug_load", Plug_Load_f);
	Cmd_AddCommand("plug_list", Plug_List_f);

	Plug_RegisterBuiltin("Plug_GetEngineFunction",	Plug_FindBuiltin, 0);//plugin wishes to find a builtin number.
	Plug_RegisterBuiltin("Plug_ExportToEngine",		Plug_ExportToEngine, 0);	//plugin has a call back that we might be interested in.
	Plug_RegisterBuiltin("Plug_ExportNative",		Plug_ExportNative, PLUG_BIF_DLLONLY);
	Plug_RegisterBuiltin("Con_Print",				Plug_Con_Print, 0);	//printf is not possible - qvm floats are never doubles, vararg floats in a cdecl call are always converted to doubles.
	Plug_RegisterBuiltin("Sys_Error",				Plug_Sys_Error, 0);
	Plug_RegisterBuiltin("Sys_Milliseconds",		Plug_Sys_Milliseconds, 0);
	Plug_RegisterBuiltin("Com_Error",				Plug_Sys_Error, 0);	//make zquake programmers happy.

	Plug_RegisterBuiltin("Cmd_AddCommand",			Plug_Cmd_AddCommand, 0);
	Plug_RegisterBuiltin("Cmd_Args",				Plug_Cmd_Args, 0);
	Plug_RegisterBuiltin("Cmd_Argc",				Plug_Cmd_Argc, 0);
	Plug_RegisterBuiltin("Cmd_Argv",				Plug_Cmd_Argv, 0);
	Plug_RegisterBuiltin("Cmd_AddText",				Plug_Cmd_AddText, 0);

	Plug_RegisterBuiltin("Cvar_Register",			Plug_Cvar_Register, 0);
	Plug_RegisterBuiltin("Cvar_Update",				Plug_Cvar_Update, 0);
	Plug_RegisterBuiltin("Cvar_SetString",			Plug_Cvar_SetString, 0);
	Plug_RegisterBuiltin("Cvar_SetFloat",			Plug_Cvar_SetFloat, 0);
	Plug_RegisterBuiltin("Cvar_GetString",			Plug_Cvar_GetString, 0);
	Plug_RegisterBuiltin("Cvar_GetFloat",			Plug_Cvar_GetFloat, 0);

	Plug_RegisterBuiltin("Net_TCPListen",			Plug_Net_TCPListen, 0);
	Plug_RegisterBuiltin("Net_Accept",				Plug_Net_Accept, 0);
	Plug_RegisterBuiltin("Net_TCPConnect",			Plug_Net_TCPConnect, 0);
#ifdef GNUTLS
	if (Init_GNUTLS())
		Plug_RegisterBuiltin("Net_SetTLSClient",				Plug_Net_SetTLSClient, 0);
#endif
	Plug_RegisterBuiltin("Net_Recv",				Plug_Net_Recv, 0);
	Plug_RegisterBuiltin("Net_Send",				Plug_Net_Send, 0);
	Plug_RegisterBuiltin("Net_SendTo",				Plug_Net_SendTo, 0);
	Plug_RegisterBuiltin("Net_Close",				Plug_Net_Close, 0);

	Plug_RegisterBuiltin("FS_Open",					Plug_FS_Open, 0);
	Plug_RegisterBuiltin("FS_Read",					Plug_Net_Recv, 0);
	Plug_RegisterBuiltin("FS_Write",				Plug_Net_Send, 0);
	Plug_RegisterBuiltin("FS_Close",				Plug_Net_Close, 0);


	Plug_RegisterBuiltin("memset",					Plug_memset, 0);
	Plug_RegisterBuiltin("memcpy",					Plug_memcpy, 0);
	Plug_RegisterBuiltin("memmove",					Plug_memmove, 0);
	Plug_RegisterBuiltin("sqrt",					Plug_sqrt, 0);
	Plug_RegisterBuiltin("sin",						Plug_sin, 0);
	Plug_RegisterBuiltin("cos",						Plug_cos, 0);
	Plug_RegisterBuiltin("atan2",					Plug_atan2, 0);

	Plug_RegisterBuiltin("GetPluginName",			Plug_GetPluginName, 0);

	Plug_Client_Init();

	if (plug_loaddefault.value)
	{
#ifdef _WIN32
		COM_EnumerateFiles("plugins/*x86.dll",	Plug_Emumerated, "x86.dll");
#elif defined(__linux__)
		COM_EnumerateFiles("plugins/*x86.so",	Plug_Emumerated, "x86.so");
#endif
		COM_EnumerateFiles("plugins/*.qvm",		Plug_Emumerated, ".qvm");
	}
}

void Plug_Tick(void)
{
	plugin_t *oldplug = currentplug;
	for (currentplug = plugs; currentplug; currentplug = currentplug->next)
	{
		if (currentplug->tick)
		{
			VM_Call(currentplug->vm, currentplug->tick, (int)(realtime*1000));
		}
	}
	currentplug = oldplug;
}

#ifndef SERVERONLY
void Plug_ResChanged(void)
{
	plugin_t *oldplug = currentplug;
	for (currentplug = plugs; currentplug; currentplug = currentplug->next)
	{
		if (currentplug->reschange)
			VM_Call(currentplug->vm, currentplug->reschange, vid.width, vid.height);
	}
	currentplug = oldplug;
}
#endif

qboolean Plugin_ExecuteString(void)
{
	plugin_t *oldplug = currentplug;
	if (Cmd_Argc()>0)
	{
		for (currentplug = plugs; currentplug; currentplug = currentplug->next)
		{
			if (currentplug->executestring)
			{
				if (VM_Call(currentplug->vm, currentplug->executestring, 0))
				{
					currentplug = oldplug;
					return true;
				}
			}
		}
	}
	currentplug = oldplug;
	return false;
}

#ifndef SERVERONLY
void Plug_SubConsoleCommand(console_t *con, char *line)
{
	char buffer[2048];
	plugin_t *oldplug = currentplug;	//shouldn't really be needed, but oh well
	currentplug = con->userdata;

	Q_strncpyz(buffer, va("%s %s", con->name, line), sizeof(buffer));
	Cmd_TokenizeString(buffer, false, false);
	VM_Call(currentplug->vm, currentplug->conexecutecommand, 0);
	currentplug = oldplug;
}
#endif

#ifndef SERVERONLY
qboolean Plug_Menu_Event(int eventtype, int param)	//eventtype = draw/keydown/keyup, param = time/key
{
	plugin_t *oc=currentplug;
	qboolean ret;
	extern int mousecursor_x, mousecursor_y;

	if (!menuplug)
		return false;

	currentplug = menuplug;
	ret = VM_Call(menuplug->vm, menuplug->menufunction, eventtype, param, mousecursor_x, mousecursor_y);
	currentplug=oc;
	return ret;
}
#endif
#ifndef SERVERONLY
int Plug_ConnectionlessClientPacket(char *buffer, int size)
{
	for (currentplug = plugs; currentplug; currentplug = currentplug->next)
	{
		if (currentplug->connectionlessclientpacket)
		{
			switch (VM_Call(currentplug->vm, currentplug->connectionlessclientpacket, buffer, size, &net_from))
			{
			case 0:
				continue;	//wasn't handled
			case 1:
				currentplug = NULL;	//was handled with no apparent result
				return true;
			case 2:
#ifndef SERVERONLY
				cls.protocol = CP_PLUGIN;	//woo, the plugin wants to connect to them!
				protocolclientplugin = currentplug;
#endif
				currentplug = NULL;
				return true;
			}
		}
	}
	return false;
}
#endif
#ifndef SERVERONLY
void Plug_SBar(void)
{
	extern qboolean sb_showscores, sb_showteamscores;

	plugin_t *oc=currentplug;
	int cp, ret;
	vrect_t rect;

	ret = 0;
	if (!plug_sbar.value)
		currentplug = NULL;
	else
	{
		for (currentplug = plugs; currentplug; currentplug = currentplug->next)
		{
			if (currentplug->sbarlevel[0])
			{
				for (cp = 0; cp < cl.splitclients; cp++)
				{	//if you don't use splitscreen, use a full videosize rect.
					SCR_VRectForPlayer(&rect, cp);
					if (Draw_ImageColours)
						Draw_ImageColours(1, 1, 1, 1); // ensure menu colors are reset
					ret |= VM_Call(currentplug->vm, currentplug->sbarlevel[0], cp, rect.x, rect.y, rect.width, rect.height, sb_showscores+sb_showteamscores*2);
				}
				break;
			}
		}
	}
	if (!ret)
	{
		Sbar_Draw();
		currentplug = oc;
		return;	//our current sbar draws a scoreboard too. We don't want that bug to be quite so apparent.
				//please don't implement this identical hack in your engines...
	}

	for (currentplug = plugs; currentplug; currentplug = currentplug->next)
	{
		if (currentplug->sbarlevel[1])
		{
			for (cp = 0; cp < cl.splitclients; cp++)
			{	//if you don't use splitscreen, use a full videosize rect.
				SCR_VRectForPlayer(&rect, cp);
				if (Draw_ImageColours)
					Draw_ImageColours(1, 1, 1, 1); // ensure menu colors are reset
				VM_Call(currentplug->vm, currentplug->sbarlevel[1], cp, rect.x, rect.y, rect.width, rect.height, sb_showscores+sb_showteamscores*2);
			}
		}
	}

	for (currentplug = plugs; currentplug; currentplug = currentplug->next)
	{
		if (currentplug->sbarlevel[2])
		{
			for (cp = 0; cp < cl.splitclients; cp++)
			{	//if you don't use splitscreen, use a full videosize rect.
				SCR_VRectForPlayer(&rect, cp);
				if (Draw_ImageColours)
					Draw_ImageColours(1, 1, 1, 1); // ensure menu colors are reset
				VM_Call(currentplug->vm, currentplug->sbarlevel[2], cp, rect.x, rect.y, rect.width, rect.height, sb_showscores+sb_showteamscores*2);
			}
		}
	}


	currentplug = oc;
}
#endif

qboolean Plug_ServerMessage(char *buffer, int messagelevel)
{
	qboolean ret = true;

	for (currentplug = plugs; currentplug; currentplug = currentplug->next)
	{
		if (currentplug->svmsgfunction)
		{
			ret &= VM_Call(currentplug->vm, currentplug->svmsgfunction, buffer, messagelevel);
		}
	}

	return ret; // true to display message, false to supress
}

qboolean Plug_ChatMessage(char *buffer, int talkernum, int tpflags)
{
	qboolean ret = true;

	for (currentplug = plugs; currentplug; currentplug = currentplug->next)
	{
		if (currentplug->chatmsgfunction)
		{
			ret &= VM_Call(currentplug->vm, currentplug->chatmsgfunction, buffer, talkernum, tpflags);
		}
	}

	return ret; // true to display message, false to supress
}

qboolean Plug_CenterPrintMessage(char *buffer, int clientnum)
{
	qboolean ret = true;

	for (currentplug = plugs; currentplug; currentplug = currentplug->next)
	{
		if (currentplug->centerprintfunction)
		{
			ret &= VM_Call(currentplug->vm, currentplug->centerprintfunction, buffer, clientnum);
		}
	}

	return ret; // true to display message, false to supress
}

void Plug_Close(plugin_t *plug)
{
	if (plug->blockcloses)
	{
		Con_Printf("Plugin %s provides driver features, and cannot safely be unloaded\n", plug->name);
		return;
	}
	if (plugs == plug)
		plugs = plug->next;
	else
	{
		plugin_t *prev;
		for (prev = plugs; prev; prev = prev->next)
		{
			if (prev->next == plug)
				break;
		}
		if (!prev)
			Sys_Error("Plug_Close: not linked\n");
		prev->next = plug->next;
	}

	Con_Printf("Closing plugin %s\n", plug->name);
	VM_Destroy(plug->vm);

	Plug_FreeConCommands(plug);

	Plug_Client_Close(plug);

	if (currentplug == plug)
		currentplug = NULL;
}

void Plug_Close_f(void)
{
	plugin_t *plug;
	char *name = Cmd_Argv(1);
	if (Cmd_Argc()<2)
	{
		Con_Printf("Close which plugin?\n");
		return;
	}
	for (plug = plugs; plug; plug = plug->next)
	{
		if (!strcmp(plug->name, name))
		{
			Plug_Close(plug);
			return;
		}
	}

	name = va("plugins/%s", name);
	for (plug = plugs; plug; plug = plug->next)
	{
		if (!strcmp(plug->name, name))
		{
			Plug_Close(plug);
			return;
		}
	}
	Con_Printf("Plugin %s does not appear to be loaded\n", Cmd_Argv(1));
}

void Plug_CloseAll_f(void)
{
	plugin_t *p;
	if (currentplug)
		Sys_Error("Plug_CloseAll_f called inside a plugin!\n");
	while(plugs)
	{
		p = plugs;
		while (p->blockcloses)
		{
			p = p->next;
			if (!p)
				return;
		}
		Plug_Close(p);
	}
}

void Plug_List_f(void)
{
	plugin_t *plug;
	for (plug = plugs; plug; plug = plug->next)
	{
		Con_Printf("%s - \n", plug->name);
		VM_PrintInfo(plug->vm);
	}
}

void Plug_Shutdown(void)
{
	while(plugs)
	{
		Plug_Close(plugs);
	}
}

#endif