mumble/plugins/gmod/gmod.cpp

// Copyright 2005-2016 The Mumble Developers. All rights reserved.
// Use of this source code is governed by a BSD-style license
// that can be found in the LICENSE file at the root of the
// Mumble source tree or at <https://www.mumble.info/LICENSE>.

/* Copyright (C) 2009-2012, Snares <snares@users.sourceforge.net>
   Copyright (C) 2005-2012, Thorvald Natvig <thorvald@natvig.com>

   All rights reserved.

   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions
   are met:

   - Redistributions of source code must retain the above copyright notice,
     this list of conditions and the following disclaimer.
   - Redistributions in binary form must reproduce the above copyright notice,
     this list of conditions and the following disclaimer in the documentation
     and/or other materials provided with the distribution.
   - Neither the name of the Mumble Developers nor the names of its
     contributors may be used to endorse or promote products derived from this
     software without specific prior written permission.

   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
   CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
   LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#include "../mumble_plugin_win32_32bit.h"

using namespace std;

procptr32_t posptr, rotptr, stateptr, hostptr;

static bool calcout(float *pos, float *rot, float *opos, float *front, float *top) {
	float v = rot[0];
	float h = rot[1];

	if ((v < -360.0f) || (v > 360.0f) || (h < -360.0f) || (h > 360.0f))
		return false;

	v *= static_cast<float>(M_PI / 180.0f);
	h *= static_cast<float>(M_PI / 180.0f);

	// Seems Gmod is in inches. INCHES?!?
	opos[0] = pos[0] / 39.37f;
	opos[1] = pos[2] / 39.37f;
	opos[2] = pos[1] / 39.37f;

	front[0] = cos(h) * cos(v);
	front[1] = -sin(v);
	front[2] = sin(h) * cos(v);

	v -= static_cast<float>(M_PI / 2.0f);

	top[0] = cos(h) * cos(v);
	top[1] = -sin(v);
	top[2] = sin(h) * cos(v);

	return true;
}

static int fetch(float *avatar_pos, float *avatar_front, float *avatar_top, float *camera_pos, float *camera_front, float *camera_top, std::string &context, std::wstring &) {
	for (int i=0;i<3;i++)
		avatar_pos[i] = avatar_front[i] = avatar_top[i] = camera_pos[i] = camera_front[i] = camera_top[i] = 0.0f;

	float ipos[3], rot[3];
	bool ok;
	//char state;
	char chHostStr[40];
	string sHost;
	ostringstream new_context;

	ok = peekProc(posptr, ipos, 12)
	     && peekProc(rotptr, rot, 12)
	     //&& peekProc(stateptr, &state, 1)
	     && peekProc(hostptr, chHostStr, 40)
	     ;
	if (!ok)
		return false;

	chHostStr[39] = 0;

	sHost.assign(chHostStr);
	if (sHost.find(':')==string::npos)
		sHost.append(":27015");

	new_context << "<context>"
	<< "<game>gmod</game>"
	<< "<hostport>" << sHost << "</hostport>"
	<< "</context>";
	context = new_context.str();
/*
	// Check to see if you are spawned
	if (state != 18)
		return true; // Deactivate plugin
*/
	ok = calcout(ipos, rot, avatar_pos, avatar_front, avatar_top);
	if (ok) {
		for (int i=0;i<3;++i) {
			camera_pos[i] = avatar_pos[i];
			camera_front[i] = avatar_front[i];
			camera_top[i] = avatar_top[i];
		}
		return true;
	}

	return false;
}

static int trylock(const std::multimap<std::wstring, unsigned long long int> &pids) {
	posptr = rotptr = NULL;

	if (! initialize(pids, L"hl2.exe", L"client.dll"))
		return false;

	procptr32_t mod_engine=getModuleAddr(L"engine.dll");
	if (!mod_engine)
		return false;

	// Remember addresses for later
	// position tuple: x,y,z, float
	// client.dll+0x6856B8
	posptr = pModule + 0x6856B8;
	// orientation tuple: v,h,? float
	// v: up = -90°, down = 90°; h (rotation): -180 - 180°
	// client.dll+0x5B5914
	rotptr = pModule + 0x5B5914;
	// spawn state: client.dll+0x?????? - 0 when at main menu, 2 when not spawned, 15 to 14 when spawned, byte
	// This could not be verified/found by Kissaki
	stateptr = mod_engine + 0x375565;
	// ID string; Game name "garrysmod"
	// engine.dll+0x6622DC
	procptr32_t idptr = mod_engine + 0x6622DC;
	// host string: String in form "ip:port".
	// engine.dll+0x49176C
	hostptr = mod_engine + 0x49176C;

	// Gamecheck
	const char ID[] = "garrysmod";
	char sMagic[18];
	if (!peekProc(idptr, sMagic, sizeof(ID)) || strncmp(ID, sMagic, sizeof(ID))!=0)
		return false;

	// Check if we can get meaningful data from it
	float apos[3], afront[3], atop[3];
	float cpos[3], cfront[3], ctop[3];
	wstring sidentity;
	string scontext;

	if (fetch(apos, afront, atop, cpos, cfront, ctop, scontext, sidentity)) {
		return true;
	} else {
		generic_unlock();
		return false;
	}
}

static const std::wstring longdesc() {
	// Exe build: 20:55:48 Jun 17 2014 (5692) (4000)
	return std::wstring(L"Supports Gmod 11 build 4426. No identity support yet.");
}

static std::wstring description(L"Garry's Mod 11 (Build 5692)");
static std::wstring shortname(L"Garry's Mod 11");

static int trylock1() {
	return trylock(std::multimap<std::wstring, unsigned long long int>());
}

static MumblePlugin gmodplug = {
	MUMBLE_PLUGIN_MAGIC,
	description,
	shortname,
	NULL,
	NULL,
	trylock1,
	generic_unlock,
	longdesc,
	fetch
};

static MumblePlugin2 gmodplug2 = {
	MUMBLE_PLUGIN_MAGIC_2,
	MUMBLE_PLUGIN_VERSION,
	trylock
};

extern "C" MUMBLE_PLUGIN_EXPORT MumblePlugin *getMumblePlugin() {
	return &gmodplug;
}

extern "C" MUMBLE_PLUGIN_EXPORT MumblePlugin2 *getMumblePlugin2() {
	return &gmodplug2;
}