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package crit
import (
"encoding/base64"
"encoding/binary"
"errors"
"fmt"
"os"
"github.com/checkpoint-restore/go-criu/v7/magic"
"google.golang.org/protobuf/proto"
)
// encodeImg identifies the type of image file
// and calls the appropriate encode handler
func encodeImg(img *CriuImage, f *os.File) error {
magicMap := magic.LoadMagic()
var err error
// Write magic
magic, ok := magicMap.ByName[img.Magic]
if !ok {
return errors.New(fmt.Sprint("unknown magic ", img.Magic))
}
magicBuf := make([]byte, 4)
if img.Magic != "INVENTORY" {
if img.Magic == "STATS" || img.Magic == "IRMAP_CACHE" {
binary.LittleEndian.PutUint32(magicBuf, uint32(magicMap.ByName["IMG_SERVICE"]))
} else {
binary.LittleEndian.PutUint32(magicBuf, uint32(magicMap.ByName["IMG_COMMON"]))
}
if _, err = f.Write(magicBuf); err != nil {
return err
}
}
binary.LittleEndian.PutUint32(magicBuf, uint32(magic))
if _, err = f.Write(magicBuf); err != nil {
return err
}
// Call handler for entries
switch img.Magic {
// Special handler for ghost files
case "GHOST_FILE":
err = img.encodeGhostFile(f)
// Default handler with func for extra data
case "BPFMAP_DATA":
err = img.encodeDefault(f, encodeBpfmapData)
case "FIFO_DATA":
err = img.encodeDefault(f, encodePipesData)
case "IPCNS_MSG":
err = img.encodeDefault(f, encodeIpcMsg)
case "IPCNS_SEM":
err = img.encodeDefault(f, encodeIpcSem)
case "IPCNS_SHM":
err = img.encodeDefault(f, encodeIpcShm)
case "PIPES_DATA":
err = img.encodeDefault(f, encodePipesData)
case "SK_QUEUES":
err = img.encodeDefault(f, encodeSkQueues)
case "TCP_STREAM":
err = img.encodeDefault(f, encodeTCPStream)
default:
err = img.encodeDefault(f, nil)
}
if err != nil {
return err
}
return nil
}
// encodeDefault is used for all image files
// that are in the standard protobuf format
func (img *CriuImage) encodeDefault(
f *os.File,
encodeExtra func(string) ([]byte, error),
) error {
sizeBuf := make([]byte, 4)
for _, entry := range img.Entries {
payload, err := proto.Marshal(entry.Message)
if err != nil {
return err
}
// Write size of payload into buffer
binary.LittleEndian.PutUint32(sizeBuf, uint32(len(payload)))
if _, err = f.Write(sizeBuf); err != nil {
return err
}
if _, err = f.Write(payload); err != nil {
return err
}
// Write extra data
if encodeExtra != nil {
if entry.Extra != "" {
extraPayload, err := encodeExtra(entry.Extra)
if err != nil {
return err
}
if _, err = f.Write(extraPayload); err != nil {
return err
}
}
}
}
return nil
}
// Special handler for ghost image
func (img *CriuImage) encodeGhostFile(f *os.File) error {
sizeBuf := make([]byte, 4)
// Write primary entry
payload, err := proto.Marshal(img.Entries[0].Message)
if err != nil {
return err
}
// Write size of payload into buffer
binary.LittleEndian.PutUint32(sizeBuf, uint32(len(payload)))
if _, err = f.Write(sizeBuf); err != nil {
return err
}
if _, err = f.Write(payload); err != nil {
return err
}
// If there is only one entry,
// then no chunks are present
if len(img.Entries) == 1 {
// Write extra data
extraPayload, err := base64.StdEncoding.DecodeString(img.Entries[0].Extra)
if err != nil {
return err
}
if _, err = f.Write(extraPayload); err != nil {
return err
}
return nil
}
// Write chunks
for _, entry := range img.Entries[1:] {
payload, err = proto.Marshal(entry.Message)
if err != nil {
return err
}
extraPayload, err := base64.StdEncoding.DecodeString(entry.Extra)
if err != nil {
return err
}
binary.LittleEndian.PutUint32(sizeBuf, uint32(len(extraPayload)))
if _, err = f.Write(sizeBuf); err != nil {
return err
}
if _, err = f.Write(payload); err != nil {
return err
}
if _, err = f.Write(extraPayload); err != nil {
return err
}
}
return nil
}
|
