www.pudn.com > tdi_fw.zip > disp_ev.c

// -*- mode: C++; tab-width: 4; indent-tabs-mode: nil -*- (for GNU Emacs) 
// 
// $Id: disp_ev.c,v 1.1.1.1 2002/09/24 11:12:16 dev Exp $ 
 
/* 
 * This file contains TDI_SET_EVENT_HANDLER handler 
 */ 
 
#include  
#include  
#include "sock.h" 
 
#include "dispatch.h" 
#include "events.h" 
#include "memtrack.h" 
#include "obj_tbl.h" 
#include "tdi_fw.h" 
 
int 
tdi_set_event_handler(PIRP irp, PIO_STACK_LOCATION irps, struct completion *completion) 
{ 
	PTDI_REQUEST_KERNEL_SET_EVENT r = (PTDI_REQUEST_KERNEL_SET_EVENT)&irps->Parameters; 
	NTSTATUS status; 
	struct ot_entry *ote = NULL; 
	KIRQL irql; 
	int result = FILTER_DENY; 
	TDI_EVENT_CONTEXT *ctx; 
 
	KdPrint(("[tdi_fw] tdi_set_event_handler: [%s] devobj 0x%x; fileobj 0x%x; EventType: %d\n", 
		r->EventHandler ? "(+)ADD" : "(-)REMOVE", 
		irps->DeviceObject, 
		irps->FileObject, 
		r->EventType)); 
 
	ote = ot_find_fileobj(irps->FileObject, &irql); 
	if (ote == NULL) { 
		KdPrint(("[tdi_fw] tdi_set_event_handler: ot_find_fileobj(0x%x)\n", irps->FileObject)); 
		if (r->EventHandler == NULL) { 
			 // for fileobjects loaded earlier than our driver allow removing 
			result = FILTER_ALLOW; 
		} 
		goto done; 
	} 
 
	if (r->EventType < 0 || r->EventType >= MAX_EVENT) { 
		KdPrint(("[tdi_fw] tdi_set_event_handler: unknown EventType %d!\n", r->EventType)); 
		result = FILTER_ALLOW; 
		goto done; 
	} 
 
	ctx = &ote->ctx[r->EventType]; 
 
	if (r->EventHandler) { 
		/* add EventHandler */ 
		int i; 
 
		for (i = 0; g_tdi_event_handlers[i].event != (ULONG)-1; i++) 
			if (g_tdi_event_handlers[i].event == r->EventType) 
				break; 
 
		if (g_tdi_event_handlers[i].event == (ULONG)-1) { 
			KdPrint(("[tdi_fw] tdi_set_event_handler: unknown EventType %d!\n", r->EventType)); 
			result = FILTER_ALLOW; 
			goto done; 
		} 
 
		ctx->old_handler = r->EventHandler; 
		ctx->old_context = r->EventContext; 
 
		if (g_tdi_event_handlers[i].handler != NULL) { 
			r->EventHandler = g_tdi_event_handlers[i].handler; 
			r->EventContext = ctx; 
		} else { 
			r->EventHandler = NULL; 
			r->EventContext = NULL; 
		} 
 
		KdPrint(("[tdi_fw] tdi_set_event_handler: old_handler 0x%x; old_context 0x%x\n", 
			r->EventHandler, r->EventContext)); 
	 
	} else { 
		/* remove EventHandler */ 
		ctx->old_handler = NULL; 
		ctx->old_context = NULL; 
	} 
 
	result = FILTER_ALLOW; 
done: 
	// cleanup 
	if (ote != NULL) 
		KeReleaseSpinLock(&g_ot_hash_guard, irql); 
 
	return result; 
}