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DHooks (Dynamic Hooks - Dev Preview)


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Dr!fter
The Salt Boss
Join Date: Mar 2007
Old 03-10-2012 , 20:46   DHooks (Dynamic Hooks - Dev Preview)
Reply With Quote #1

Oh no, not ANOTHER hooks extension!!!

This extension is not just ANOTHER hooks extension But rather allows sourcemod plugins to create their own hooks.

Note that you cannot set or get a unknown param/return's value.

As a basic note, if the return type is void there won’t be a return handle pushed to the callback. If there is no params no param handle will be pushed. If this pointer is set to ignore this won’t be pushed.

Example/Test Plugin

PHP Code:
#pragma semicolon 1
#include <sourcemod>
#include <sdktools>
#include <dhooks>

// int CBaseCombatCharacter::BloodColor(void)
new Handle:hBloodColor;

// bool CBaseCombatCharacter::Weapon_CanUse(CBaseCombatWeapon *)
new Handle:hHookCanUse;

// Vector CBasePlayer::GetPlayerMaxs()
new Handle:hGetMaxs;

// string_t CBaseEntity::GetModelName(void)
new Handle:hGetModelName;

// bool CGameRules::CanHaveAmmo(CBaseCombatCharacter *, int)
new Handle:hCanHaveAmmo;

// void CBaseEntity::SetModel(char  const*)
new Handle:hSetModel;

//float CCSPlayer::GetPlayerMaxSpeed()
new Handle:hGetSpeed;

//int CCSPlayer::OnTakeDamage(CTakeDamageInfo const&)
new Handle:hTakeDamage;

// bool CBaseEntity::AcceptInput(char  const*, CBaseEntity*, CBaseEntity*, variant_t, int)
new Handle:hAcceptInput;

//int CBaseCombatCharacter::GiveAmmo(int, int, bool)
new Handle:hGiveAmmo;

// CVEngineServer::ClientPrintf(edict_t *, char  const*)
new Handle:hClientPrintf;

public 
OnPluginStart()
{
    new 
Handle:temp LoadGameConfigFile("dhooks-test.games");
    
    if(
temp == INVALID_HANDLE)
    {
        
SetFailState("Why you no has gamedata?");
    }
    
    new 
offset;
    
    
offset GameConfGetOffset(temp"BloodColor");
    
hBloodColor DHookCreate(offsetHookType_EntityReturnType_IntThisPointer_CBaseEntityBloodColorPost);
    
    
offset GameConfGetOffset(temp"GetModelName");
    
hGetModelName DHookCreate(offsetHookType_EntityReturnType_StringThisPointer_CBaseEntityGetModelName);
    
    
offset GameConfGetOffset(temp"GetMaxs");
    
hGetMaxs DHookCreate(offsetHookType_EntityReturnType_VectorThisPointer_IgnoreGetMaxsPost);
    
    
offset GameConfGetOffset(temp"CanUse");
    
hHookCanUse DHookCreate(offsetHookType_EntityReturnType_BoolThisPointer_CBaseEntityCanUsePost);
    
DHookAddParam(hHookCanUseHookParamType_CBaseEntity);
    
    
offset GameConfGetOffset(temp"CanHaveAmmo");
    
hCanHaveAmmo DHookCreate(offsetHookType_GameRulesReturnType_BoolThisPointer_IgnoreCanHaveAmmoPost);
    
DHookAddParam(hCanHaveAmmoHookParamType_CBaseEntity);
    
DHookAddParam(hCanHaveAmmoHookParamType_Int);
    
    
offset GameConfGetOffset(temp"SetModel");
    
hSetModel DHookCreate(offsetHookType_EntityReturnType_VoidThisPointer_CBaseEntitySetModel);
    
DHookAddParam(hSetModelHookParamType_CharPtr);
    
    
offset GameConfGetOffset(temp"AcceptInput");
    
hAcceptInput DHookCreate(offsetHookType_EntityReturnType_BoolThisPointer_CBaseEntityAcceptInput);
    
DHookAddParam(hAcceptInputHookParamType_CharPtr);
    
DHookAddParam(hAcceptInputHookParamType_CBaseEntity);
    
DHookAddParam(hAcceptInputHookParamType_CBaseEntity);
    
DHookAddParam(hAcceptInputHookParamType_Object20DHookPass_ByVal|DHookPass_ODTOR|DHookPass_OCTOR|DHookPass_OASSIGNOP); //varaint_t is a union of 12 (float[3]) plus two int type params 12 + 8 = 20
    
DHookAddParam(hAcceptInputHookParamType_Int);
        
    
offset GameConfGetOffset(temp"GetMaxPlayerSpeed");
    
hGetSpeed DHookCreate(offsetHookType_EntityReturnType_FloatThisPointer_CBaseEntityGetMaxPlayerSpeedPost);
        
    
offset GameConfGetOffset(temp"GiveAmmo");
    
hGiveAmmo DHookCreate(offsetHookType_EntityReturnType_IntThisPointer_CBaseEntityGiveAmmo);
    
DHookAddParam(hGiveAmmoHookParamType_Int);
    
DHookAddParam(hGiveAmmoHookParamType_Int);
    
DHookAddParam(hGiveAmmoHookParamType_Bool);
        
    
offset GameConfGetOffset(temp"OnTakeDamage");
    
hTakeDamage DHookCreate(offsetHookType_EntityReturnType_IntThisPointer_CBaseEntityOnTakeDamage);
    
DHookAddParam(hTakeDamageHookParamType_ObjectPtr, -1DHookPass_ByRef);
    
    
DHookAddEntityListener(ListenType_CreatedEntityCreated);
    
    
//Add client printf hook pThis requires effort
    
StartPrepSDKCall(SDKCall_Static);
    if(!
PrepSDKCall_SetFromConf(tempSDKConf_Signature"CreateInterface"))
    {
        
SetFailState("Failed to get CreateInterface");
        
CloseHandle(temp);
    }
    
    
PrepSDKCall_AddParameter(SDKType_StringSDKPass_Pointer);
    
PrepSDKCall_AddParameter(SDKType_PlainOldDataSDKPass_PointerVDECODE_FLAG_ALLOWNULL);
    
PrepSDKCall_SetReturnInfo(SDKType_PlainOldDataSDKPass_Plain);
    
    new 
String:iface[64];
    if(!
GameConfGetKeyValue(temp"EngineInterface"ifacesizeof(iface)))
    {
        
SetFailState("Failed to get engine interface name");
        
CloseHandle(temp);
    }
    
    new 
Handle:call EndPrepSDKCall();
    new 
Address:addr SDKCall(calliface0);
    
CloseHandle(call);
    
    if(!
addr)
    {
        
SetFailState("Failed to get engine ptr");
    }
    
    
offset GameConfGetOffset(temp"ClientPrintf");
    
hClientPrintf DHookCreate(offsetHookType_RawReturnType_VoidThisPointer_IgnoreHook_ClientPrintf);
    
DHookAddParam(hClientPrintfHookParamType_Edict);
    
DHookAddParam(hClientPrintfHookParamType_CharPtr);
    
DHookRaw(hClientPrintffalseaddr);
    
    
CloseHandle(temp);
    
}

public 
MRESReturn:Hook_ClientPrintf(Handle:hParams)
{
    new 
client DHookGetParam(hParams1);
    
decl String:buffer[1024];
    
DHookGetParamString(hParams2buffersizeof(buffer));
    
PrintToChat(client"BUFFER %s"buffer);
    return 
MRES_Ignored;
}

public 
MRESReturn:AcceptInput(pThisHandle:hReturnHandle:hParams)
{
    new 
String:command[128];
    
DHookGetParamString(hParams1commandsizeof(command));
    new 
type DHookGetParamObjectPtrVar(hParams416,ObjectValueType_Int);
    new 
String:wtf[128];
    
DHookGetParamObjectPtrString(hParams40ObjectValueType_Stringwtfsizeof(wtf));
    
PrintToServer("Command %s Type %i String %s"commandtypewtf);
    
DHookSetReturn(hReturnfalse);
    return 
MRES_Supercede;
}

public 
OnMapStart()
{
    
//Hook Gamerules function in map start
    
DHookGamerules(hCanHaveAmmotrueRemovalCB);
}

public 
OnClientPutInServer(client)
{
    
DHookEntity(hSetModelfalseclientRemovalCB);
    
DHookEntity(hHookCanUsetrueclientRemovalCB);
    
DHookEntity(hGetSpeedtrueclientRemovalCB);
    
DHookEntity(hGiveAmmofalseclient);
    
DHookEntity(hGetModelNametrueclient);
    
DHookEntity(hTakeDamagefalseclient);
    
DHookEntity(hGetMaxstrueclientRemovalCB);
    
DHookEntity(hBloodColortrueclient);
}

public 
EntityCreated(entity, const String:classname[])
{
    if(
strcmp(classname"point_servercommand") == 0)
    {
        
DHookEntity(hAcceptInputfalseentity);
    }
}

//int CCSPlayer::OnTakeDamage(CTakeDamageInfo const&)
public MRESReturn:OnTakeDamage(pThisHandle:hReturnHandle:hParams)
{
    
PrintToServer("DHooksHacks = Victim %i, Attacker %i, Inflictor %i, Damage %f"pThisDHookGetParamObjectPtrVar(hParams140ObjectValueType_Ehandle), DHookGetParamObjectPtrVar(hParams136ObjectValueType_Ehandle), DHookGetParamObjectPtrVar(hParams148ObjectValueType_Float));
    
    if(
pThis <= MaxClients && pThis && !IsFakeClient(pThis))
    {
        
DHookSetParamObjectPtrVar(hParams148ObjectValueType_Float0.0);
        
PrintToChat(pThis"Pimping your hp");
    }
}

// int CBaseCombatCharacter::GiveAmmo(int, int, bool)
public MRESReturn:GiveAmmo(pThisHandle:hReturnHandle:hParams)
{
    
PrintToChat(pThis"Giving %i of %i supress %i"DHookGetParam(hParams1), DHookGetParam(hParams2), DHookGetParam(hParams3));
    return 
MRES_Ignored;
}

// void CBaseEntity::SetModel(char  const*)
public MRESReturn:SetModel(pThisHandle:hParams)
{
    
//Change all bot skins to phoenix one
    
if(IsFakeClient(pThis))
    {
        
DHookSetParamString(hParams1"models/player/t_phoenix.mdl");
        return 
MRES_ChangedHandled;
    }
    return 
MRES_Ignored;
}

//float CCSPlayer::GetPlayerMaxSpeed()
public MRESReturn:GetMaxPlayerSpeedPost(pThisHandle:hReturn)
{
    
//Make bots slow
    
if(IsFakeClient(pThis))
    {
        
DHookSetReturn(hReturn100.0);
        return 
MRES_Override;
    }
    return 
MRES_Ignored;
}

// bool CGameRules::CanHaveAmmo(CBaseCombatCharacter *, int)
public MRESReturn:CanHaveAmmoPost(Handle:hReturnHandle:hParams)
{
    
PrintToServer("Can has ammo? %s %i"DHookGetReturn(hReturn)?"true":"false"DHookGetParam(hParams2));
    return 
MRES_Ignored;
}

// string_t CBaseEntity::GetModelName(void)
public MRESReturn:GetModelName(pThisHandle:hReturn)
{
    new 
String:returnval[128];
    
DHookGetReturnString(hReturnreturnvalsizeof(returnval));
    
    if(
IsFakeClient(pThis))
    {
        
PrintToServer("It is a bot, Model should be: models/player/t_phoenix.mdl It is %s"returnval);
    }
    
    return 
MRES_Ignored;
}

// Vector CBasePlayer::GetPlayerMaxs()
public MRESReturn:GetMaxsPost(Handle:hReturn)
{
    new 
Float:vec[3];
    
DHookGetReturnVector(hReturnvec);
    
PrintToServer("Get maxes %.3f, %.3f, %.3f"vec[0], vec[1], vec[2]);
    
    return 
MRES_Ignored;
}

// bool CBaseCombatCharacter::Weapon_CanUse(CBaseCombatWeapon *)
public MRESReturn:CanUsePost(pThisHandle:hReturnHandle:hParams)
{
    
//Bots get nothing.
    
if(IsFakeClient(pThis))
    {
        
DHookSetReturn(hReturnfalse);
        return 
MRES_Override;
    }
    return 
MRES_Ignored;
}

// int CBaseCombatCharacter::BloodColor(void)
public MRESReturn:BloodColorPost(pThisHandle:hReturn)
{
    
//Change the bots blood color to goldish yellow
    
if(IsFakeClient(pThis))
    {
        
DHookSetReturn(hReturn2);
        return 
MRES_Supercede;
    }
    return 
MRES_Ignored;
}

public 
RemovalCB(hookid)
{
    
PrintToServer("Removed hook %i"hookid);

Note: Gamerule hooks are removed OnMapEnd so you must hook them again in OnMapStart. Entity hooks are removed when the entity is removed.

Thats all there is to it!

Since this is a dev preview crashes can happen. I mostly tested in CS: S Windows. If you experience a crash please post the function, game, OS, and code.

Changelog:
  • 1.0.1-pre-alpha
    • Added Raw hook (allows passing class pointer)
    • Fixed certain hooks unhooking randomly.
  • 1.0.2-alpha
    • Added support for more params (new max is 10)
    • Added ability to add entity listeners (To hook OnEntityCreated and OnEntityDestroyed)
    • Changed from pre-alpha to alpha
  • 1.0.3-alpha
    • Fixed various memory leaks.
    • Fixed requiring latest gamehelpers i face
  • 1.0.4-alpha
    • Added support for Object pointer params (CTakeDamage in OnTakeDamage for example)
    • Removed the need for a removal callback when hooking (Its not mandatory now).
  • 1.0.5-alpha
    • Fixed a crash when a hook was removed that had no removal callback.
  • 1.0.6-alpha
    • Fixed a crash on newer engines.
  • 1.0.7-alpha
    • Fixed a crash with strings
    • Fixed a crash on new engines
    • Added support for CS:GO
    • Added support for edict_t
  • 1.0.8-alpha
    • Added support for getting the address of |this|
  • 1.0.9-alpha
    • Removed asserts from OnEntityCreated
  • 1.0.11-alpha
    • Made engine specific builds so that it works with tf2 again.
    • Hopefully fixed crashes in CS:GO in OnEntityCreated
    • Fixed a bug using Edict params.
    • Requires SM 1.5 and MM:S 1.9+
  • 1.0.12-alpha
    • Fixed crashing when accessing NULL pointers
    • Added native to check if a param is NULL before accessing it (DHookIsNullParam)
  • 1.0.13-alpha
    • Fixed a memory leak when unhooking entities.
    • Removed the need for gamedata by switching to SDKHooks entity listeners.
  • 2.0.0-dev
    • Added ability to handle params with a size other than 4
    • Restructed how hooking was handled
    • Fixed multiple memory leaks
    • Use SDKHooks for entity listeners
    • Remove the need for SDK specific builds
    • Updated to use AMBuild2
    • General code rewrite
    • Added mac support.
    • Automated builds!
  • 2.0.1-dev
    • Fixed not being able to read or set returns that were pointers.
    • Updated test plugin for SM 1.7+
  • 2.0.2-dev
    • Fix memory leak
  • 2.0.3-dev
    • Fix not being able to block void functions.
    • Fix not being able to change Vector params.
  • 2.0.4-dev
    • Fix raw hooks incorrectly comparing and passing incorrect callback functions.
    • Fix not being able to change Object Vector params.
  • 2.0.5-dev
    • Fix using ThrowNativeError outside of natives. (SM 1.8+)
  • 2.0.6-dev
    • Fixed not being able to set Vector return values.
  • 2.1.0-dev
    • Fixed a multitude of object param related issues.
    • Added new enum values to DHookPassFlag to be used for objects.
  • 2.1.1-dev
    • Fixed incorrectly unhooking non entity hooks in OnEntityDestroyed
    • Fixed not ending context (Thanks BoTox)
  • 2.2.0-dev
    • Fixed potential crash
    • Add support for setting callback when hooking instead of on create only (Allows creating post/pre hooks with one handle)

When installing DHooks2 make sure to remove any previous bin's of DHooks(1)

DHooks2 REQUIRES SourceMod 1.7+
hg93+ REQUIRES SourceMod 1.8+

Credits:
dvander - Helping with asm and being a huge help overall.
KyleS - Input and reviewing my shitty commits.
psychonic - Quacking and helping with buildbot along with coding questions.
asherkin - SourceHook info.
Powerlord - Debugging and fixing crashes.

Links:
Source : https://bitbucket.org/Drifter321/dhooks2
Waterfall : https://builds.alliedmods.net/drifter/waterfall
Builds : http://users.alliedmods.net/~drifter/builds/dhooks/

DHooks with detour support (credit to Peace-Maker)
https://forums.alliedmods.net/showpo...&postcount=589

Last edited by Dr!fter; 05-04-2018 at 09:00.
Dr!fter is offline
donrevan
AlliedModders Donor
Join Date: Jul 2010
Old 03-11-2012 , 05:56   Re: DHooks (Dynamic Hooks - Dev Preview)
Reply With Quote #2

I can't belive it! This is so much awesome!! It will replace nearly all my "just-a-hook-extensions" thank you for releasing this (did I already said this IS awesome?)

Last edited by donrevan; 03-11-2012 at 06:11.
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Thrawn2
Veteran Member
Join Date: Apr 2009
Old 03-11-2012 , 09:18   Re: DHooks (Dynamic Hooks - Dev Preview)
Reply With Quote #3

Nice work!
Is being used by this.
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Zephyrus
Cool Pig B)
Join Date: Jun 2010
Location: Hungary
Old 03-11-2012 , 11:37   Re: DHooks (Dynamic Hooks - Dev Preview)
Reply With Quote #4

ill use it with my hats plugin to hook setentitymodel, thank you, nice job
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Peace-Maker
SourceMod Plugin Approver
Join Date: Aug 2008
Location: Germany
Old 03-11-2012 , 13:52   Re: DHooks (Dynamic Hooks - Dev Preview)
Reply With Quote #5

Wow, that's more than useful. I'll definetly mess with this Thank you!
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KyleS
SourceMod Plugin Approver
Join Date: Jul 2009
Location: Segmentation Fault.
Old 03-11-2012 , 14:42   Re: DHooks (Dynamic Hooks - Dev Preview)
Reply With Quote #6

Your example has already done something I've been looking to do for a while now, thanks a ton Drifter!
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Dreamy
SourceMod Donor
Join Date: Mar 2012
Old 03-11-2012 , 15:04   Re: DHooks (Dynamic Hooks - Dev Preview)
Reply With Quote #7

awsum, great job!! =)
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Dr!fter
The Salt Boss
Join Date: Mar 2007
Old 03-13-2012 , 20:54   Re: DHooks (Dynamic Hooks - Dev Preview)
Reply With Quote #8

Updated the extension to add support for raw pointer address's. There is an example using CDirector for left4dead2 in the test plugin. Also fixed hooks randomly getting unhooked if they weren't entity hooks.
Dr!fter is offline
Dr!fter
The Salt Boss
Join Date: Mar 2007
Old 03-17-2012 , 10:50   Re: DHooks (Dynamic Hooks - Dev Preview)
Reply With Quote #9

Updated again. Full changelog is in the original post. I removed the "pre-alpha" tag and made it an alpha. Ive been getting more time to test different hooks and seems to be working good so that is the reason
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KyleS
SourceMod Plugin Approver
Join Date: Jul 2009
Location: Segmentation Fault.
Old 03-18-2012 , 02:01   Re: DHooks (Dynamic Hooks - Dev Preview)
Reply With Quote #10

<KyleS> Drifter, Are you aware of any leaks in DHooks? D:
* ViolentCrimes has quit (Read error: Connection reset by peer)
<KyleS> Drifter, http://pastie.org/private/vxdnhepkmhi7wowytmydcg - If the client is kicked, if the plugin or ext is unloaded, the memory still isn't freed. I'm not sure where it's occuring. I could fire up Valgrind though if you can't reproduce it.
<KyleS> Hit about 2.5gb in 12h lol D:
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