-
-
Notifications
You must be signed in to change notification settings - Fork 167
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
fix: exclavecore bundle file extraction
- Loading branch information
Showing
8 changed files
with
269 additions
and
160 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,113 @@ | ||
| package fw | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "encoding/binary" | ||
| "fmt" | ||
| "io" | ||
| "os" | ||
| "path/filepath" | ||
|
|
||
| "github.com/blacktop/go-macho" | ||
| "github.com/blacktop/go-macho/types" | ||
| "github.com/blacktop/ipsw/pkg/bundle" | ||
| ) | ||
|
|
||
| func Extract(input, output string) ([]string, error) { | ||
| var m *macho.File | ||
| var outfiles []string | ||
|
|
||
| bn, err := bundle.Parse(input) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to parse bundle: %v", err) | ||
| } | ||
|
|
||
| if bn.Type != 3 { | ||
| return nil, fmt.Errorf("bundle is not an exclave bundle") | ||
| } | ||
|
|
||
| f, err := os.Open(input) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to open file %s: %v", input, err) | ||
| } | ||
| defer f.Close() | ||
|
|
||
| for idx, bf := range bn.Files { | ||
| fname := filepath.Join(output, bf.Type, bf.Name) | ||
| if err := os.MkdirAll(filepath.Dir(fname), 0o750); err != nil { | ||
| return nil, fmt.Errorf("failed to create directory %s: %v", filepath.Dir(fname), err) | ||
| } | ||
|
|
||
| of, err := os.Create(fname) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to create file %s: %v", fname, err) | ||
| } | ||
| defer of.Close() | ||
|
|
||
| if len(bf.Segments) == 0 { // FIXME: should this be removed? | ||
| continue | ||
| } | ||
|
|
||
| // Get MachO header | ||
| if entry := bn.Config.TOC[idx].GetEntry(); entry != nil && entry.Type == 2 { // kernel (SYSTEM) | ||
| if _, err := f.Seek(int64(bn.Config.Assets[idx].Offset), io.SeekStart); err != nil { | ||
| return nil, fmt.Errorf("failed to seek to offset %d: %v", bn.Config.Assets[idx].Offset, err) | ||
| } | ||
| mHdrData := make([]byte, bn.Config.Assets[idx].Size) // __MACHOHEADERLC | ||
| if err := binary.Read(f, binary.LittleEndian, &mHdrData); err != nil { | ||
| return nil, fmt.Errorf("failed to read data from file %s: %v", fname, err) | ||
| } | ||
| m, err = macho.NewFile(bytes.NewReader(mHdrData), macho.FileConfig{ | ||
| LoadIncluding: []types.LoadCmd{types.LC_SEGMENT_64}, | ||
| }) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to parse MachO file: %v", err) | ||
| } | ||
| defer m.Close() | ||
| // write MACHOHEADERLC to output file | ||
| if _, err := of.Write(mHdrData); err != nil { | ||
| return nil, fmt.Errorf("failed to write data to file %s: %v", fname, err) | ||
| } | ||
| } else { | ||
| if text := bf.Segment("TEXT"); text == nil { | ||
| return nil, fmt.Errorf("failed to find TEXT segment") | ||
| } else { | ||
| if _, err := f.Seek(int64(text.Offset), io.SeekStart); err != nil { | ||
| return nil, fmt.Errorf("failed to seek to offset %d: %v", text.Offset, err) | ||
| } | ||
| tdata := make([]byte, text.Size) | ||
| if err := binary.Read(f, binary.LittleEndian, &tdata); err != nil { | ||
| return nil, fmt.Errorf("failed to read data from file %s: %v", fname, err) | ||
| } | ||
| m, err = macho.NewFile(bytes.NewReader(tdata), macho.FileConfig{ | ||
| LoadIncluding: []types.LoadCmd{types.LC_SEGMENT_64}, | ||
| }) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to parse MachO file: %v", err) | ||
| } | ||
| defer m.Close() | ||
| } | ||
| } | ||
|
|
||
| for _, seg := range bf.Segments { | ||
| if _, err := f.Seek(int64(seg.Offset), io.SeekStart); err != nil { | ||
| return nil, fmt.Errorf("failed to seek to offset %d: %v", seg.Offset, err) | ||
| } | ||
| data := make([]byte, seg.Size) | ||
| if err := binary.Read(f, binary.LittleEndian, &data); err != nil { | ||
| return nil, fmt.Errorf("failed to read data from file %s: %v", fname, err) | ||
| } | ||
| if s := m.Segment("__" + seg.Name); s == nil { // lookup segment in MachO header | ||
| return nil, fmt.Errorf("failed to find segment %s", seg.Name) | ||
| } else { | ||
| if _, err := of.WriteAt(data, int64(s.Offset)); err != nil { | ||
| return nil, fmt.Errorf("failed to write data to file %s: %v", fname, err) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| outfiles = append(outfiles, fname) | ||
| } | ||
|
|
||
| return outfiles, nil | ||
| } |
Oops, something went wrong.