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payload.go
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package aota
import (
"archive/zip"
"fmt"
"io"
"os"
"strings"
"sync"
"google.golang.org/protobuf/proto"
crunch "github.com/superwhiskers/crunch/v3"
humanize "github.com/dustin/go-humanize"
)
const (
brilloMajorPayloadVersion = 2
payloadMagic = "CrAU"
payloadDotBin = "payload.bin"
payloadUnderscoreProperties = "payload_properties.txt"
payloadMetaInfMetadata = "META-INF/com/android/metadata"
payloadMetaInfMetadataPb = "META-INF/com/android/metadata.pb"
payloadMetaInfOtaCert = "META-INF/com/android/otacert"
)
type Payload struct {
sync.Mutex //Locks attempts to seek or read the consumer
Temporary bool
In string
Extract []string
Manifest *DeltaArchiveManifest
Metadata *OtaMetadata
BaseOffset uint64
BlockSize uint64
Partitions []*PartitionUpdate
Consumer *PayloadConsumer
MetadataConsumer io.ReadCloser
Installer *InstallOps
InstallSession *InstallSession
}
func (payload *Payload) String() string {
parts := make([]string, 0)
size := uint64(0)
ops := 0
for i := 0; i < len(payload.Partitions); i++ {
part := payload.Partitions[i]
pSize := uint64(0)
for j := 0; j < len(part.Operations); j++ {
if op := part.Operations[j]; op != nil {
pSize += op.GetDataLength()
}
}
partStr := fmt.Sprintf("- %s: %s (%d ops)", part.PartitionName, humanize.Bytes(pSize), len(part.Operations))
parts = append(parts, partStr)
size += pSize
ops += len(part.Operations)
}
otaType := "?"
cond := "cond:"
m := payload.Metadata
if m != nil {
switch m.Type {
case OtaMetadata_UNKNOWN:
otaType = "UNKNOWN"
case OtaMetadata_AB:
otaType = "AB"
case OtaMetadata_BLOCK:
otaType = "BLOCK"
case OtaMetadata_BRICK:
otaType = "BRICK"
}
state := m.Precondition
if state == nil {
state = m.Postcondition
}
if state != nil {
cond += "true"
if len(state.Device) > 0 {
cond += " target:'" + state.Device[0] + "'"
}
if state.BuildIncremental != "" {
cond += " incremental:'" + state.BuildIncremental + "'"
}
} else {
cond += "false"
}
}
return fmt.Sprintf("type:'%s'\nwipe:%t\ndowngrade:%t\n%s\nin:'%s'\nextract:%v\npartitions:%d\nsize:'%s'\nops:%d\noffset:%d\nblock:%d\n%s",
otaType, m.Wipe, m.Downgrade, cond,
payload.In, payload.Extract, len(payload.Partitions), humanize.Bytes(size),
ops, payload.BaseOffset, payload.BlockSize, strings.Join(parts, "\n"))
}
func NewPayloadURL(in string, extract []string) (*Payload, error) {
return nil, fmt.Errorf("network payloads are not supported yet")
}
func NewPayloadFile(in string, extract []string, extractArchive bool) (*Payload, error) {
payload := &Payload{
In: in,
Extract: extract,
Consumer: &PayloadConsumer{},
Manifest: &DeltaArchiveManifest{},
Metadata: &OtaMetadata{},
}
bin, err := os.Open(in)
if err != nil {
return nil, fmt.Errorf("error opening payload: %v", err)
}
stat, err := bin.Stat()
if err != nil {
return nil, fmt.Errorf("error getting stat on payload: %v", err)
}
if zrc, err := zip.NewReader(bin, stat.Size()); err == nil {
//Find and open the payload binary
zrcPayload, err := zrc.Open(payloadDotBin)
if err != nil {
return nil, fmt.Errorf("error finding payload inside archive: %v", err)
}
if extractArchive {
tmpPayload, err := os.CreateTemp("", "aota_payload-*.bin")
if err != nil {
return nil, fmt.Errorf("error creating temp payload: %v", err)
}
tmpPayloadName := tmpPayload.Name()
if _, err := io.Copy(tmpPayload, zrcPayload); err != nil {
zrcPayload.Close()
tmpPayload.Close()
os.Remove(tmpPayloadName)
return nil, fmt.Errorf("error extracting temp payload: %v", err)
}
tmpPayload.Seek(0, 0) //Reset the position since we wrote to it
//Re-open the archived payload to reset its read position
zrcPayload.Close()
zrcPayload, err = zrc.Open(payloadDotBin)
if err != nil {
tmpPayload.Close()
os.Remove(tmpPayloadName)
return nil, fmt.Errorf("error re-opening payload inside archive: %v", err)
}
payload.Consumer.Seekable = tmpPayload
payload.In = tmpPayloadName
payload.Temporary = true
}
payload.Consumer.Readable = zrcPayload
//Find and store the payload metadata
if zrcMetadata, err := zrc.Open(payloadMetaInfMetadataPb); err == nil {
payload.MetadataConsumer = zrcMetadata
}
} else {
payload.Consumer.Seekable = bin
}
return payload, payload.Parse()
}
func (payload *Payload) Close() error {
//TODO: Fight for .Installer locks to set .Closed=true for graceful worker deaths
//Wait for all workers to finish before returning from Close()
//Close out active handles
if payload.MetadataConsumer != nil {
payload.MetadataConsumer.Close()
}
if payload.Consumer != nil {
payload.Consumer.Close()
}
if payload.Temporary {
if err := os.Remove(payload.In); err != nil {
return err
}
}
//Dereference everything
payload.Partitions = nil
payload.Installer = nil
return nil
}
func (payload *Payload) Parse() error {
if payload.Consumer == nil {
return fmt.Errorf("cannot parse nil consumer")
}
//Parse metadata if available
if payload.MetadataConsumer != nil {
metadataRaw, err := io.ReadAll(payload.MetadataConsumer)
if err != nil {
return fmt.Errorf("error reading metadata: %v", err)
}
if err := proto.Unmarshal(metadataRaw, payload.Metadata); err != nil {
return fmt.Errorf("error parsing metadata protobuf: %v", err)
}
}
headerSize := uint64(len(payloadMagic) + 8 + 8 + 4) //magic + version(u64) + manifestLen(u64) + metadataSignatureLen(u32)
header := make([]byte, headerSize)
if _, err := io.ReadFull(payload.Consumer, header); err != nil {
return fmt.Errorf("error reading payload header: %v", err)
}
buf := crunch.NewBuffer(header)
magic := buf.ReadBytesNext(int64(len(payloadMagic)))
if string(magic) != payloadMagic {
return fmt.Errorf("incorrect payload magic: %s", magic)
}
version := buf.ReadU64BENext(1)[0]
if version != brilloMajorPayloadVersion {
return fmt.Errorf("unsupported payload version %d, requires %d", version, brilloMajorPayloadVersion)
}
manifestLen := buf.ReadU64BENext(1)[0]
if manifestLen == 0 {
return fmt.Errorf("manifest cannot be empty")
}
metadataSigLen := buf.ReadU32BENext(1)[0]
if metadataSigLen == 0 {
return fmt.Errorf("metadata signature cannot be empty")
}
manifestRaw := make([]byte, manifestLen)
if _, err := io.ReadFull(payload.Consumer, manifestRaw); err != nil {
return fmt.Errorf("error reading payload manifest: %v", err)
}
if err := proto.Unmarshal(manifestRaw, payload.Manifest); err != nil {
return fmt.Errorf("error parsing payload protobuf: %v", err)
}
payload.BaseOffset = headerSize + manifestLen + uint64(metadataSigLen)
payload.BlockSize = uint64(payload.Manifest.GetBlockSize())
payload.Partitions = make([]*PartitionUpdate, 0)
for i := 0; i < len(payload.Manifest.Partitions); i++ {
if payload.Extract != nil && len(payload.Extract) > 0 {
if !contains(payload.Extract, payload.Manifest.Partitions[i].PartitionName) {
continue
}
}
payload.Partitions = append(payload.Partitions, payload.Manifest.Partitions[i])
}
return nil
}
func (payload *Payload) ReadBytes(offset, length int64) ([]byte, error) {
payload.Lock()
defer payload.Unlock()
if _, err := payload.Consumer.Seek(offset, 0); err != nil {
return nil, err
}
data := make([]byte, length)
if n, err := payload.Consumer.Read(data); err != nil {
return nil, fmt.Errorf("read %d bytes: %v", n, err)
}
return data, nil
}