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// +build windows
package ps
import (
"fmt"
"syscall"
"unsafe"
)
// Windows API functions
var (
modKernel32 = syscall.NewLazyDLL("kernel32.dll")
procCloseHandle = modKernel32.NewProc("CloseHandle")
procCreateToolhelp32Snapshot = modKernel32.NewProc("CreateToolhelp32Snapshot")
procProcess32First = modKernel32.NewProc("Process32FirstW")
procProcess32Next = modKernel32.NewProc("Process32NextW")
procModule32First = modKernel32.NewProc("Module32FirstW")
procModule32Next = modKernel32.NewProc("Module32NextW")
)
// Some constants from the Windows API
const (
ERROR_NO_MORE_FILES = 0x12
MAX_PATH = 260
MAX_MODULE_NAME32 = 255
)
type PROCESSENTRY32 struct {
Size uint32
CntUsage uint32
ProcessID uint32
DefaultHeapID uintptr
ModuleID uint32
CntThreads uint32
ParentProcessID uint32
PriorityClassBase int32
Flags uint32
ExeFile [MAX_PATH]uint16
}
// WindowsProcess is an implementation of Process for Windows.
type WindowsProcess struct {
pid int
ppid int
exe string
}
// Pid returns process id
func (p *WindowsProcess) Pid() int {
return p.pid
}
// PPid returns parent process id
func (p *WindowsProcess) PPid() int {
return p.ppid
}
// Executable returns process executable name
func (p *WindowsProcess) Executable() string {
return p.exe
}
// Path returns path to process executable
func (p *WindowsProcess) Path() (string, error) {
processModules, err := modules(p.pid)
if err != nil {
return "", err
}
if len(processModules) == 0 {
return "", fmt.Errorf("No modules found for process")
}
return processModules[0].path, nil
}
func ptrToString(c []uint16) string {
i := 0
for {
if c[i] == 0 {
return syscall.UTF16ToString(c[:i])
}
i++
}
}
func newWindowsProcess(e *PROCESSENTRY32) *WindowsProcess {
return &WindowsProcess{
pid: int(e.ProcessID),
ppid: int(e.ParentProcessID),
exe: ptrToString(e.ExeFile[:]),
}
}
func findProcess(pid int) (Process, error) {
return findProcessWithFn(processes, pid)
}
func findProcessWithFn(processesFn processesFn, pid int) (Process, error) {
ps, err := processesFn()
if err != nil {
return nil, fmt.Errorf("Error listing processes: %s", err)
}
for _, p := range ps {
if p.Pid() == pid {
return p, nil
}
}
return nil, nil
}
func processes() ([]Process, error) {
handle, _, _ := procCreateToolhelp32Snapshot.Call(
0x00000002,
0)
if handle < 0 {
return nil, syscall.GetLastError()
}
defer procCloseHandle.Call(handle)
var entry PROCESSENTRY32
entry.Size = uint32(unsafe.Sizeof(entry))
ret, _, _ := procProcess32First.Call(handle, uintptr(unsafe.Pointer(&entry)))
if ret == 0 {
return nil, fmt.Errorf("Error retrieving process info.")
}
results := make([]Process, 0, 50)
for {
results = append(results, newWindowsProcess(&entry))
ret, _, _ := procProcess32Next.Call(handle, uintptr(unsafe.Pointer(&entry)))
if ret == 0 {
break
}
}
return results, nil
}
// MODULEENTRY32 is the Windows API structure that contains a modules's
// information.
type MODULEENTRY32 struct {
Size uint32
ModuleID uint32
ProcessID uint32
GlblcntUsage uint32
ProccntUsage uint32
ModBaseAddr *uint8
ModBaseSize uint32
HModule uintptr
SzModule [MAX_MODULE_NAME32 + 1]uint16
SzExePath [MAX_PATH]uint16
}
type windowsModule struct {
name string
path string
}
func newWindowsModule(e *MODULEENTRY32) windowsModule {
return windowsModule{
name: ptrToString(e.SzModule[:]),
path: ptrToString(e.SzExePath[:]),
}
}
func modules(pid int) ([]windowsModule, error) {
handle, _, _ := procCreateToolhelp32Snapshot.Call(
0x00000008, // TH32CS_SNAPMODULE
uintptr(uint32(pid)))
if handle < 0 {
return nil, syscall.GetLastError()
}
defer procCloseHandle.Call(handle)
var entry MODULEENTRY32
entry.Size = uint32(unsafe.Sizeof(entry))
ret, _, _ := procModule32First.Call(handle, uintptr(unsafe.Pointer(&entry)))
if ret == 0 {
return nil, fmt.Errorf("Error retrieving module info")
}
results := make([]windowsModule, 0, 50)
for {
results = append(results, newWindowsModule(&entry))
ret, _, _ := procModule32Next.Call(handle, uintptr(unsafe.Pointer(&entry)))
if ret == 0 {
break
}
}
return results, nil
}
|
