Hi ,
I am working on an IPfilter hook driver.As the DDK says that i can provide my hook function by sending IOCTL_PF_SET_EXTENSION_POINTER to ipfilterdriver .The code below shows what i am doing but when i run the checked build in the debugger ipfilter driver displays " PointerIOCTL request failed " –
I dont know what is the problem pls help me on this…
RtlInitUnicodeString(&ustrObjectName,L"\Device\IPFILTERDRIVER" );
status = IoGetDeviceObjectPointer(&ustrObjectName,
FILE_READ_DATA | FILE_WRITE_DATA,
&pFileObject,
&pIPFilterDevObj); // first i collect the pointer to ipfilterdriver object
ExtensionHookInfo = PacketFilterExtension; // this is my packet filter function
pExtensionIrp = IoBuildDeviceIoControlRequest( IOCTL_PF_SET_EXTENSION_POINTER , pIPFilterDevObj,
ExtensionHookInfo,
sizeof(ExtensionHookInfo),
NULL,
OutputBufferLength,
FALSE,
NULL,
pIoStatusBlock
);
status = IoCallDriver(pIPFilterDevObj,pExtensionIrp); // calling ipfilterdriver to set it
Any Help is appreciated…
— Subodh
Did you check status from IoGetDeviceObjectPointer?
Driver sceleton from http://ntdev.h1.ru/ipfilter.html works under checked
build without problems. Hope it helps.
vlad-ntdev
----- Original Message -----
From: “Subodh Gupta”
To: “NT Developers Interest List”
Sent: Tuesday, August 06, 2002 5:35 PM
Subject: [ntdev] Help IPFilterHookDriver Problem…
Hi ,
I am working on an IPfilter hook driver.As the DDK says that i can
provide my hook function by sending IOCTL_PF_SET_EXTENSION_POINTER to
ipfilterdriver .The code below shows what i am doing but when i run the
checked build in the debugger ipfilter driver displays " PointerIOCTL
request failed " –
I dont know what is the problem pls help me on this…
RtlInitUnicodeString(&ustrObjectName,L"\Device\IPFILTERDRIVER"
);
status = IoGetDeviceObjectPointer(&ustrObjectName,
FILE_READ_DATA | FILE_WRITE_DATA,
&pFileObject,
&pIPFilterDevObj); // first i collect the pointer to
ipfilterdriver object
ExtensionHookInfo = PacketFilterExtension; // this is my
packet filter function
pExtensionIrp = IoBuildDeviceIoControlRequest(
IOCTL_PF_SET_EXTENSION_POINTER , pIPFilterDevObj,
ExtensionHookInfo,
sizeof(ExtensionHookInfo),
NULL,
OutputBufferLength,
FALSE,
NULL,
pIoStatusBlock
);
status = IoCallDriver(pIPFilterDevObj,pExtensionIrp); //
calling ipfilterdriver to set it
Any Help is appreciated…
— Subodh
—
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If ExtensionHookInfo is a pointer then sizeof(ExtensionHookInfo) is the
wrong size.
Bill Wandel
-----Original Message-----
From: xxxxx@lists.osr.com
[mailto:xxxxx@lists.osr.com]On Behalf Of Subodh Gupta
Sent: Tuesday, August 06, 2002 9:35 AM
To: NT Developers Interest List
Subject: [ntdev] Help IPFilterHookDriver Problem…
Hi ,
I am working on an IPfilter hook driver.As the DDK says that i can provide
my hook function by sending IOCTL_PF_SET_EXTENSION_POINTER to ipfilterdriver
.The code below shows what i am doing but when i run the checked build in
the debugger ipfilter driver displays " PointerIOCTL request failed " –
I dont know what is the problem pls help me on this…
RtlInitUnicodeString(&ustrObjectName,L"\Device\IPFILTERDRIVER" );
status = IoGetDeviceObjectPointer(&ustrObjectName,
FILE_READ_DATA | FILE_WRITE_DATA,
&pFileObject,
&pIPFilterDevObj); // first i collect the pointer to
ipfilterdriver object
ExtensionHookInfo = PacketFilterExtension; // this is my packet
filter function
pExtensionIrp =
oBuildDeviceIoControlRequest( IOCTL_PF_SET_EXTENSION_POINTER ,
pIPFilterDevObj,
ExtensionHookInfo,
sizeof(ExtensionHookInfo),
NULL,
OutputBufferLength,
FALSE,
NULL,
pIoStatusBlock
);
status = IoCallDriver(pIPFilterDevObj,pExtensionIrp); // calling
ipfilterdriver to set it
Any Help is appreciated…
— Subodh
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To unsubscribe send a blank email to %%email.unsub%%
Dear All,
This may be a simple Q to post. But am not getting any help on
this…
Is there anyway we can register a function along with a timer so
that the function will be called when the timer expires?
cheers
Sesha.
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Hi All,
Thanks for the valuable help now everything is working fine.Last time i was
also checking status from IoGetDeviceObjectPointer it.was STATUS_SUCCESS.
What was the reason for that??
– Subodh
----- Original Message -----
From: “vlad-ntdev”
To: “NT Developers Interest List”
Sent: Tuesday, August 06, 2002 8:06 PM
Subject: [ntdev] Re: Help IPFilterHookDriver Problem…
> Did you check status from IoGetDeviceObjectPointer?
>
> Driver sceleton from http://ntdev.h1.ru/ipfilter.html works under checked
> build without problems. Hope it helps.
>
> vlad-ntdev
>
> ----- Original Message -----
> From: “Subodh Gupta”
> To: “NT Developers Interest List”
> Sent: Tuesday, August 06, 2002 5:35 PM
> Subject: [ntdev] Help IPFilterHookDriver Problem…
>
>
> Hi ,
> I am working on an IPfilter hook driver.As the DDK says that i can
> provide my hook function by sending IOCTL_PF_SET_EXTENSION_POINTER to
> ipfilterdriver .The code below shows what i am doing but when i run the
> checked build in the debugger ipfilter driver displays " PointerIOCTL
> request failed " –
> I dont know what is the problem pls help me on this…
>
> RtlInitUnicodeString(&ustrObjectName,L"\Device\IPFILTERDRIVER"
> );
>
> status = IoGetDeviceObjectPointer(&ustrObjectName,
> FILE_READ_DATA | FILE_WRITE_DATA,
> &pFileObject,
> &pIPFilterDevObj); // first i collect the pointer to
> ipfilterdriver object
>
> ExtensionHookInfo = PacketFilterExtension; // this is my
> packet filter function
>
> pExtensionIrp = IoBuildDeviceIoControlRequest(
> IOCTL_PF_SET_EXTENSION_POINTER , pIPFilterDevObj,
> ExtensionHookInfo,
> sizeof(ExtensionHookInfo),
> NULL,
> OutputBufferLength,
> FALSE,
> NULL,
> pIoStatusBlock
> );
>
> status = IoCallDriver(pIPFilterDevObj,pExtensionIrp); //
> calling ipfilterdriver to set it
>
>
> Any Help is appreciated…
>
> — Subodh
>
> —
> You are currently subscribed to ntdev as: xxxxx@unshadow.net
> To unsubscribe send a blank email to %%email.unsub%%
>
>
>
>
> —
> You are currently subscribed to ntdev as: xxxxx@leadbyte.com
> To unsubscribe send a blank email to %%email.unsub%%
>
----- Original Message -----
From: “Subodh Gupta”
To: “NT Developers Interest List”
Sent: Wednesday, August 07, 2002 3:37 PM
Subject: [ntdev] Re: Help IPFilterHookDriver Problem…
> Hi All,
> Thanks for the valuable help now everything is working fine.Last time i
was
> also checking status from IoGetDeviceObjectPointer it.was STATUS_SUCCESS.
>
> What was the reason for that??
>
> – Subodh
I supposed that device IPFILTERDRIVER probably was not exists. And
IoGetDeviceObjectPointer didn’t initialize its output parameters. And you
created IRP with them and passed it to function. But I didn’t think a lot
about your question and was wrong. You told that your code worked under free
build but had problems under checked build. Sorry.
vlad-ntdev