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inject.go
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inject.go
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package main
import (
"errors"
"log"
"os"
"path/filepath"
"syscall"
"time"
"unsafe"
"github.com/itchio/ox/syscallex"
"github.com/itchio/ox/winox"
"github.com/itchio/ox/winox/execas"
"golang.org/x/sys/windows"
)
var (
kernel32mod = windows.NewLazySystemDLL("kernel32.dll")
procLoadLibraryW = kernel32mod.NewProc("LoadLibraryW")
user32mod = windows.NewLazySystemDLL("user32.dll")
procMessageBoxW = user32mod.NewProc("MessageBoxW")
)
func injectPID(dllFile string, pid int64) {
var err error
dllFile, err = filepath.Abs(dllFile)
must(err)
_, err = os.Stat(dllFile)
must(err)
log.Printf("Injecting (%s) into PID (%d)", dllFile, pid)
doInject(dllFile, int64(pid))
log.Printf("Done injecting")
}
func injectExe(dllFile string, exeFile string) {
var err error
exeFile, err = filepath.Abs(exeFile)
must(err)
_, err = os.Stat(exeFile)
must(err)
log.Printf("Injecting (%s) into (%s)", dllFile, exeFile)
cwd, err := os.Getwd()
must(err)
cmd := execas.Command(exeFile)
cmd.Dir = cwd
cmd.Env = os.Environ()
cmd.Stdout = os.Stdout
cmd.Stdin = os.Stdin
var creationFlags uint32 = 0 /* syscallex.CREATE_SUSPENDED */
cmd.SysProcAttr = &syscallex.SysProcAttr{
CreationFlags: creationFlags,
}
log.Printf("Creating process suspended...")
err = cmd.Start()
must(err)
log.Printf("Process handle: %012x", cmd.SysProcAttr.ProcessHandle)
log.Printf(" Thread handle: %012x", cmd.SysProcAttr.ThreadHandle)
pid := cmd.ProcessState.Pid()
go func() {
log.Printf("Sleeping a bit before injection...")
time.Sleep(500 * time.Millisecond)
log.Printf("Okay, inject now!")
doInject(dllFile, int64(pid))
}()
log.Printf("Okay, waiting now")
err = cmd.Wait()
must(err)
log.Printf("And we're done!")
}
func doInject(dllFile string, pid int64) {
var err error
dllFile, err = filepath.Abs(dllFile)
must(err)
_, err = os.Stat(dllFile)
must(err)
processHandle, err := syscall.OpenProcess(syscallex.PROCESS_ALL_ACCESS, false, uint32(pid))
must(err)
log.Printf("Process handle: %012x", processHandle)
// log.Printf("Suspending a thread")
// _, err = syscallex.SuspendThread(cmd.SysProcAttr.ThreadHandle)
// must(err)
dllFile16 := syscall.StringToUTF16(dllFile)
size := uintptr(len(dllFile16) * 2 /* wchars */)
log.Printf("Contents of dllFile16: %x", dllFile16)
log.Printf("Allocating %d bytes of memory", size)
mem, err := syscallex.VirtualAllocEx(
processHandle,
0,
size,
syscallex.MEM_RESERVE|syscallex.MEM_COMMIT,
syscallex.PAGE_READWRITE,
)
must(err)
log.Printf("Allocated memory at %012x", mem)
log.Printf("Writing to process memory...")
writtenSize, err := syscallex.WriteProcessMemory(
processHandle,
mem,
unsafe.Pointer(&dllFile16[0]),
uint32(size),
)
must(err)
log.Printf("Wrote %d bytes to process memory", writtenSize)
log.Printf("LoadLibraryW address = %012x", procLoadLibraryW.Addr())
threadHandle, threadId, err := syscallex.CreateRemoteThread(
processHandle,
nil,
0,
procLoadLibraryW.Addr(),
mem,
0,
)
must(err)
defer winox.SafeRelease(uintptr(threadHandle))
log.Printf("Created remote thread: ID %012x, handle %012x", threadId, threadHandle)
beforeWait := time.Now()
event, err := syscall.WaitForSingleObject(threadHandle, 4000)
log.Printf("(Wait took %v)", time.Since(beforeWait))
must(err)
if event == syscall.WAIT_OBJECT_0 {
log.Printf("Oh hey injection... worked?")
exitCode, err := syscallex.GetExitCodeThread(threadHandle)
must(err)
log.Printf("Thread exit code: %012x", exitCode)
} else {
must(errors.New("Injection failed"))
}
log.Printf("Waiting a bit till we resume...")
time.Sleep(500 * time.Millisecond)
// log.Printf("Resuming!")
// _, err = syscallex.ResumeThread(cmd.SysProcAttr.ThreadHandle)
// must(err)
}