SDKCall : Invalid Handle 0 on certain computer ?

RedSword · **Author**

Hi,

I'd like to know how is it possible for two computer running with the same OS-family to have different ways to run a SDKCall...

I do have my plugin AfkBomb (http://forums.alliedmods.net/showthread.php?t=152329) having someone's to drop the bomb if he's afk.

To get this done, I need to "Prepare" a SDKCall (StartPrepSDKCall, EndPrepSDKCall & cie). I'm able to get it working on my test server (Windows Vista) :

Code:

StartPrepSDKCall(SDKCall_Player);
PrepSDKCall_SetFromConf(hGameConf, SDKConf_Signature, "CSWeaponDrop");
PrepSDKCall_AddParameter(SDKType_CBaseEntity, SDKPass_Pointer);
PrepSDKCall_AddParameter(SDKType_Bool, SDKPass_Plain);
PrepSDKCall_AddParameter(SDKType_Bool, SDKPass_Plain);
hDropWeapon = EndPrepSDKCall();

However, for sinblaster, who is also running his server on Windows (Windows Server / mmsource-1.8.5 / sourcemod-1.3.6, which are the lastest versions), it does work. He gets the error

Code:

[SM] Native "SDKCall" reported: Invalid Handle 0 (error 4)

From my "SDKCall", which does work on my own computer. My plugin is also running on currently 16 others server at this time (@game-monitor).

That makes me ask :

1. How is this possible ?
2. Is it possible that 2 plugins conflict with each others over a SDKCall ?
3. How can a handle that works for me (meaning != 0) not work for someone else (= 0), knowing that both are Windows OS?
4. Could it be my variable used for a handle that could be written by another plugin ? (Are globals variable in a plugin share-able ?)

Any tips or hint on how to resolve that problem would be appreciated.

Thanks,

Red

-----

Oh, and BTW, it seems that I'm not the only one having this problem :

http://forums.alliedmods.net/showthr...ll#post1418565
http://forums.alliedmods.net/showthr...all#post927525

However, I don't see anything that could help in other threads...

Wazz · 03-28-2011 , 21:19 Re: SDKCall : Invalid Handle 0 on certain computer ?

The signature may not be properly wildcarded or there's a plugin on the Windows server that is altering the signature.

**Dr!fter** · 03-28-2011 , 23:02 Re: SDKCall : Invalid Handle 0 on certain computer ?

Just FYI CSS: DM detours that signature so it won't work if CSS: DM is running. I believe you need to wild card the first 6 bytes and make sure the signature is still unique. There is a bug report to add a native to cstrike extension for CSWeaponDrop, I've already added it it's just awaiting approval.

RedSword · 03-28-2011 , 23:35 Re: SDKCall : Invalid Handle 0 on certain computer ?

Quote:

Originally Posted by Dr!fter

Just FYI CSS: DM detours that signature so it won't work if CSS: DM is running. I believe you need to wild card the first 6 bytes and make sure the signature is still unique.

The first 6 bytes for Windows And/Or Linux ?

Would :

Code:

"windows" "\x55\x8B\xEC\x81\xEC\x2A\x2A\x2A\x2A\x89\x8D\x2A\x2A\x2A\x2A\xC6"
"linux"	"@_ZN9CCSPlayer12CSWeaponDropEP17CBaseCombatWeaponbb"

Become :

Code:

"windows" "\x2A\x2A\x2A\x2A\x2A\x2A\x2A\x2A\x2A\x89\x8D\x2A\x2A\x2A\x2A\xC6"
"linux"	"@______SPlayer12CSWeaponDropEP17CBaseCombatWeaponbb"

I've no idea of the wildcard in Windows... I'm assuming its 2A since it is repeated that often (I doubt I'm right... and if so that would be disastrous =x... so many 2A)

Also, would it bug if there was 2 signatures found ? Or would a random one be taken ? Or the first one ? (So if I test and if it works once it should always works)

Quote:

Originally Posted by Dr!fter

There is a bug report to add a native to cstrike extension for CSWeaponDrop, I've already added it it's just awaiting approval.

Thanks. May I know when your bug report was done so I can know if I can expect it soon ?

Thank you both for your answer.

**Silvers** · 03-29-2011 , 05:42 Re: SDKCall : Invalid Handle 0 on certain computer ?

2A is the wildcard lol. I think it does bug / error / fail on finding more than 1 sig.

AtomicStryker · 03-29-2011 , 08:51 Re: SDKCall : Invalid Handle 0 on certain computer ?

Quote:

Originally Posted by Silvers

2A is the wildcard lol. I think it does bug / error / fail on finding more than 1 sig.

No it hooks the first match. Which may or may not crash if called.

**Dr!fter** · *Last edited by Dr!fter; 03-29-2011 at 22:45.*

Quote:

Originally Posted by RedSword

The first 6 bytes for Windows And/Or Linux ?

Would :

Code:

"windows" "\x55\x8B\xEC\x81\xEC\x2A\x2A\x2A\x2A\x89\x8D\x2A\x2A\x2A\x2A\xC6"
"linux"	"@_ZN9CCSPlayer12CSWeaponDropEP17CBaseCombatWeaponbb"

Become :

Code:

"windows" "\x2A\x2A\x2A\x2A\x2A\x2A\x2A\x2A\x2A\x89\x8D\x2A\x2A\x2A\x2A\xC6"
"linux"	"@______SPlayer12CSWeaponDropEP17CBaseCombatWeaponbb"

I've no idea of the wildcard in Windows... I'm assuming its 2A since it is repeated that often (I doubt I'm right... and if so that would be disastrous =x... so many 2A)

Also, would it bug if there was 2 signatures found ? Or would a random one be taken ? Or the first one ? (So if I test and if it works once it should always works)

Thanks. May I know when your bug report was done so I can know if I can expect it soon ?

Thank you both for your answer.

https://bugs.alliedmods.net/show_bug.cgi?id=4732

Thats the bug report. Also you need to add wildcards only to the windows sig. Here is the gamedata used in the bugreport (last i tested it was fine with css:dm)

PHP Code:


			
            "CSWeaponDrop"
            {
                "library"        "server"
                "windows"        "\x2A\x2A\x2A\x2A\x2A\x2A\x2A\x2A\x2A\x89\x8D\x5C\x2A\x2A\x2A\xC6\x45\x2A\x2A\x8B\x8D\x5C\x2A\x2A\x2A\xE8"
                "linux"            "@_ZN9CCSPlayer12CSWeaponDropEP17CBaseCombatWeaponbb"
                "mac"            "@_ZN9CCSPlayer12CSWeaponDropEP17CBaseCombatWeaponbb"
            }

RedSword · 03-29-2011 , 20:52 Re: SDKCall : Invalid Handle 0 on certain computer ?

Quote:

Originally Posted by Dr!fter

https://bugs.alliedmods.net/show_bug.cgi?id=4732

Thats the bug report. Also you need to add wildcards only too the windows sig. Here is the gamedata used in the bugreport (last i tested it was fine with css:dm

PHP Code:


			
            "CSWeaponDrop"

            {

                "library"        "server"

                "windows"        "\x2A\x2A\x2A\x2A\x2A\x2A\x2A\x2A\x2A\x89\x8D\x5C\x2A\x2A\x2A\xC6\x45\x2A\x2A\x8B\x8D\x5C\x2A\x2A\x2A\xE8"

                "linux"            "@_ZN9CCSPlayer12CSWeaponDropEP17CBaseCombatWeaponbb"

                "mac"            "@_ZN9CCSPlayer12CSWeaponDropEP17CBaseCombatWeaponbb"

            }

Thanks. I'll test that in my plugin =D.

RedSword · 03-30-2011 , 11:03 Re: SDKCall : Invalid Handle 0 on certain computer ?

sinblaster still get the same error =/.

Your signature works thought ...