/
utils.go
230 lines (203 loc) · 5.17 KB
/
utils.go
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package crit
import (
"encoding/binary"
"errors"
"fmt"
"io"
"os"
"strconv"
"github.com/checkpoint-restore/go-criu/v5/crit/images"
"github.com/checkpoint-restore/go-criu/v5/magic"
)
// Helper to decode magic name from hex value
func readMagic(f *os.File) (string, error) {
magicMap := magic.LoadMagic()
// Read magic
magicBuf := make([]byte, 4)
if _, err := f.Read(magicBuf); err != nil {
return "", err
}
magicValue := uint64(binary.LittleEndian.Uint32(magicBuf))
if magicValue == magicMap.ByName["IMG_COMMON"] ||
magicValue == magicMap.ByName["IMG_SERVICE"] {
if _, err := f.Read(magicBuf); err != nil {
return "", err
}
magicValue = uint64(binary.LittleEndian.Uint32(magicBuf))
}
// Identify magic
magicName, ok := magicMap.ByValue[magicValue]
if !ok {
return "", errors.New(fmt.Sprintf("Unknown magic 0x%x", magicValue))
}
return magicName, nil
}
// Helper to convert bytes into a more readable unit
func countBytes(n int64) string {
const UNIT int64 = 1024
if n < UNIT {
return fmt.Sprint(n, " B")
}
div, exp := UNIT, 0
for i := n / UNIT; i >= UNIT; i /= UNIT {
div *= UNIT
exp++
}
return fmt.Sprintf("%.1f %cB", float64(n)/float64(div), "KMGTPE"[exp])
}
// Function to count number of top-level entries
func countImg(f *os.File) (*CriuImage, error) {
img := CriuImage{}
var err error
// Identify magic
if img.Magic, err = readMagic(f); err != nil {
return nil, err
}
count := 0
sizeBuf := make([]byte, 4)
// Read payload size and increment counter until EOF
for {
if n, err := f.Read(sizeBuf); err != nil {
if n == 0 && err == io.EOF {
break
}
return nil, err
}
payloadSize := int64(binary.LittleEndian.Uint32(sizeBuf))
if _, err = f.Seek(payloadSize, 1); err != nil {
return nil, err
}
count++
}
// Decrement counter by 1 for pagemap file,
// as pagemap head is not a top-level entry
if img.Magic == "PAGEMAP" {
count--
}
entry := CriuEntry{Extra: strconv.Itoa(count)}
img.Entries = append(img.Entries, &entry)
return &img, nil
}
// Helper to decode image when file path is given
func getImg(path string) (*CriuImage, error) {
file, err := os.Open(path)
if err != nil {
return nil, errors.New(fmt.Sprint("Error opening binary file: ", err))
}
defer file.Close()
return decodeImg(file, false)
}
// Global variables to cache loaded images
var (
filesImg, regImg, pipeImg, unixSkImg *CriuImage
)
// Helper to get file path for exploring file descriptors
func getFilePath(dir string, fId uint32, fType images.FdTypes) (string, error) {
var filePath string
var err error
// Get open files
if filesImg == nil {
filesImg, err = getImg(fmt.Sprintf("%s/files.img", dir))
if err != nil {
return "", err
}
}
// Check if file entry is present
var file *images.FileEntry
for _, entry := range filesImg.Entries {
file = entry.Message.(*images.FileEntry)
if file.GetId() == fId {
break
}
}
switch fType {
case images.FdTypes_REG:
filePath, err = getRegFilePath(dir, file, fId)
case images.FdTypes_PIPE:
filePath, err = getPipeFilePath(dir, file, fId)
case images.FdTypes_UNIXSK:
filePath, err = getUnixSkFilePath(dir, file, fId)
default:
filePath = fmt.Sprintf("%s.%d", images.FdTypes_name[int32(fType)], fId)
}
return filePath, err
}
// Helper to get file path of regular files
func getRegFilePath(dir string, file *images.FileEntry, fId uint32) (string, error) {
var err error
if file != nil {
if file.GetReg() != nil {
return file.GetReg().GetName(), nil
}
return "Unknown path", nil
}
if regImg == nil {
regImg, err = getImg(fmt.Sprintf("%s/reg-files.img", dir))
if err != nil {
return "", err
}
}
for _, entry := range regImg.Entries {
regFile := entry.Message.(*images.RegFileEntry)
if regFile.GetId() == fId {
return regFile.GetName(), nil
}
}
return "Unknown path", nil
}
// Helper to get file path of pipe files
func getPipeFilePath(dir string, file *images.FileEntry, fId uint32) (string, error) {
var err error
if file != nil {
if file.GetPipe() != nil {
return fmt.Sprintf("pipe[%d]", file.GetPipe().GetPipeId()), nil
}
return "pipe[?]", nil
}
if pipeImg == nil {
pipeImg, err = getImg(fmt.Sprintf("%s/pipes.img", dir))
if err != nil {
return "", err
}
}
for _, entry := range pipeImg.Entries {
pipeFile := entry.Message.(*images.PipeEntry)
if pipeFile.GetId() == fId {
return fmt.Sprintf("pipe[%d]", pipeFile.GetPipeId()), nil
}
}
return "pipe[?]", nil
}
// Helper to get file path of UNIX socket files
func getUnixSkFilePath(dir string, file *images.FileEntry, fId uint32) (string, error) {
var err error
if file != nil {
if file.GetUsk() != nil {
return fmt.Sprintf(
"unix[%d (%d) %s]",
file.GetUsk().GetIno(),
file.GetUsk().GetPeer(),
file.GetUsk().GetName(),
), nil
}
return "unix[?]", nil
}
if unixSkImg == nil {
unixSkImg, err = getImg(fmt.Sprintf("%s/unixsk.img", dir))
if err != nil {
return "", err
}
}
for _, entry := range unixSkImg.Entries {
unixSkFile := entry.Message.(*images.UnixSkEntry)
if unixSkFile.GetId() == fId {
return fmt.Sprintf(
"unix[%d (%d) %s]",
unixSkFile.GetIno(),
unixSkFile.GetPeer(),
unixSkFile.GetName(),
), nil
}
}
return "unix[?]", nil
}