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util/fdshark.c: Add IO tracing utility

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This commit is contained in:
Tau 2019-05-09 16:49:18 -04:00
parent 649e7d2b4e
commit 03cace7785
3 changed files with 235 additions and 0 deletions
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217
util/fdshark.c Normal file
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@ -0,0 +1,217 @@
#include <windows.h>
#include <assert.h>
#include <stdbool.h>
#include <stddef.h>
#include <string.h>
#include "hook/iobuf.h"
#include "hook/iohook.h"
#include "util/dprintf.h"
#include "util/dump.h"
#include "util/fdshark.h"
static const wchar_t *fdshark_path;
static HANDLE fdshark_target_fd;
static int fdshark_flags;
static HRESULT fdshark_handle_irp(struct irp *irp);
static HRESULT fdshark_handle_open(struct irp *irp);
static HRESULT fdshark_handle_close(struct irp *irp);
static HRESULT fdshark_handle_read(struct irp *irp);
static HRESULT fdshark_handle_write(struct irp *irp);
static HRESULT fdshark_handle_ioctl(struct irp *irp);
static bool fdshark_force_sync(struct irp *irp, HRESULT hr);
HRESULT fdshark_hook_init(const wchar_t *path, int flags)
{
assert(path != NULL);
assert(!(flags & ~FDSHARK_ALL_FLAGS_));
fdshark_path = path;
fdshark_flags = flags;
return iohook_push_handler(fdshark_handle_irp);
}
static HRESULT fdshark_handle_irp(struct irp *irp)
{
assert(irp != NULL);
if (irp->op != IRP_OP_OPEN && irp->fd != fdshark_target_fd) {
return iohook_invoke_next(irp);
}
switch (irp->op) {
case IRP_OP_OPEN: return fdshark_handle_open(irp);
case IRP_OP_CLOSE: return fdshark_handle_close(irp);
case IRP_OP_READ: return fdshark_handle_read(irp);
case IRP_OP_WRITE: return fdshark_handle_write(irp);
case IRP_OP_IOCTL: return fdshark_handle_ioctl(irp);
default: return iohook_invoke_next(irp);
}
}
static HRESULT fdshark_handle_open(struct irp *irp)
{
HRESULT hr;
if (_wcsicmp(irp->open_filename, fdshark_path) != 0) {
return iohook_invoke_next(irp);
}
hr = iohook_invoke_next(irp);
if (FAILED(hr)) {
return hr;
}
dprintf("FdShark: Opened %S\n", fdshark_path);
fdshark_target_fd = irp->fd;
return hr;
}
static HRESULT fdshark_handle_close(struct irp *irp)
{
dprintf("FdShark: Closed %S\n", fdshark_path);
fdshark_target_fd = NULL;
return iohook_invoke_next(irp);
}
static HRESULT fdshark_handle_read(struct irp *irp)
{
HRESULT hr;
if (!(fdshark_flags & FDSHARK_TRACE_READ)) {
return iohook_invoke_next(irp);
}
dprintf("FdShark: Read %p:%i/%i\n",
irp->read.bytes,
(int) irp->read.pos,
(int) irp->read.nbytes);
hr = iohook_invoke_next(irp);
if (FAILED(hr) && !fdshark_force_sync(irp, hr)) {
dprintf("FdShark: FAILED: %x\n", (int) hr);
} else {
dprintf("FdShark: Read %p:%i/%i OK\n",
irp->read.bytes,
(int) irp->read.pos,
(int) irp->read.nbytes);
dump_iobuf(&irp->read);
}
return S_OK;
}
static HRESULT fdshark_handle_write(struct irp *irp)
{
HRESULT hr;
if (!(fdshark_flags & FDSHARK_TRACE_WRITE)) {
return iohook_invoke_next(irp);
}
dprintf("FdShark: Write %p:%i/%i\n",
irp->write.bytes,
(int) irp->write.pos,
(int) irp->write.nbytes);
dump_const_iobuf(&irp->write);
hr = iohook_invoke_next(irp);
if (FAILED(hr) && !fdshark_force_sync(irp, hr)) {
dprintf("FdShark: FAILED: %x\n", (int) hr);
} else {
dprintf("FdShark: Write %p:%i/%i OK\n",
irp->write.bytes,
(int) irp->write.pos,
(int) irp->write.nbytes);
}
return S_OK;
}
static HRESULT fdshark_handle_ioctl(struct irp *irp)
{
HRESULT hr;
if (!(fdshark_flags & FDSHARK_TRACE_IOCTL)) {
return iohook_invoke_next(irp);
}
dprintf("FdShark: Ioctl %08x w:%p:%i/%i r:%p:%i/%i\n",
irp->ioctl,
irp->write.bytes,
(int) irp->write.pos,
(int) irp->write.nbytes,
irp->read.bytes,
(int) irp->read.pos,
(int) irp->read.nbytes);
dump_const_iobuf(&irp->write);
hr = iohook_invoke_next(irp);
if (FAILED(hr) && !fdshark_force_sync(irp, hr)) {
dprintf("FdShark: FAILED: %x\n", (int) hr);
} else {
dprintf("FdShark: Ioctl %08x w:%p:%i/%i r:%p:%i/%i OK\n",
irp->ioctl,
irp->write.bytes,
(int) irp->write.pos,
(int) irp->write.nbytes,
irp->read.bytes,
(int) irp->read.pos,
(int) irp->read.nbytes);
dump_iobuf(&irp->read);
}
return S_OK;
}
static bool fdshark_force_sync(struct irp *irp, HRESULT hr)
{
DWORD xferred;
BOOL ok;
if (!(fdshark_flags & FDSHARK_FORCE_SYNC)) {
return false;
}
if ( hr != HRESULT_FROM_WIN32(ERROR_IO_PENDING) &&
hr != HRESULT_FROM_NT(STATUS_PENDING)) {
return false;
}
ok = GetOverlappedResult(irp->fd, irp->ovl, &xferred, TRUE);
if (!ok) {
hr = HRESULT_FROM_WIN32(GetLastError());
dprintf("FdShark: Synchronous block failed: %x\n", (int) hr);
return false;
}
switch (irp->op) {
case IRP_OP_READ:
case IRP_OP_IOCTL:
irp->read.pos += xferred;
break;
case IRP_OP_WRITE:
irp->write.pos += xferred;
break;
default:
break;
}
return true;
}

16
util/fdshark.h Normal file
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@ -0,0 +1,16 @@
#pragma once
#include <windows.h>
#include <stdbool.h>
#include <stddef.h>
enum {
FDSHARK_FORCE_SYNC = 0x1,
FDSHARK_TRACE_READ = 0x2,
FDSHARK_TRACE_WRITE = 0x4,
FDSHARK_TRACE_IOCTL = 0x8,
FDSHARK_ALL_FLAGS_ = 0xF,
};
HRESULT fdshark_hook_init(const wchar_t *filename, int flags);

2
util/meson.build
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@ -17,6 +17,8 @@ util_lib = static_library(
'dprintf.h',
'dump.c',
'dump.h',
'fdshark.c',
'fdshark.h',
'gfx.c',
'gfx.h',
'setupapi.c',