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cmds.go
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cmds.go
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package macho
import (
"bytes"
"encoding/binary"
"encoding/json"
"fmt"
"io"
"path/filepath"
"strings"
"unsafe"
"github.com/blacktop/go-macho/internal/saferio"
"github.com/blacktop/go-macho/pkg/codesign"
"github.com/blacktop/go-macho/types"
)
// A Load represents any Mach-O load command.
type Load interface {
Command() types.LoadCmd
LoadSize() uint32 // Need the TOC for alignment, sigh.
Raw() []byte
Write(buf *bytes.Buffer, o binary.ByteOrder) error
String() string
MarshalJSON() ([]byte, error)
}
// LoadCmdBytes is a command-tagged sequence of bytes.
// This is used for Load Commands that are not (yet)
// interesting to us, and to common up this behavior for
// all those that are.
type LoadCmdBytes struct {
types.LoadCmd
LoadBytes
}
func (s LoadCmdBytes) String() string {
return s.LoadCmd.String() + ": " + s.LoadBytes.String()
}
func (s LoadCmdBytes) Copy() LoadCmdBytes {
return LoadCmdBytes{LoadCmd: s.LoadCmd, LoadBytes: s.LoadBytes.Copy()}
}
// A LoadBytes is the uninterpreted bytes of a Mach-O load command.
type LoadBytes []byte
func (b LoadBytes) String() string {
s := "["
for i, a := range b {
if i > 0 {
s += " "
if len(b) > 48 && i >= 16 {
s += fmt.Sprintf("... (%d bytes)", len(b))
break
}
}
s += fmt.Sprintf("%x", a)
}
s += "]"
return s
}
func (b LoadBytes) MarshalJSON() ([]byte, error) {
return json.Marshal(&struct {
LoadCmd string `json:"load_cmd"`
Data []byte `json:"data,omitempty"`
}{
LoadCmd: "unknown",
Data: b,
})
}
func (b LoadBytes) Raw() []byte { return b }
func (b LoadBytes) Copy() LoadBytes { return LoadBytes(append([]byte{}, b...)) }
func (b LoadBytes) LoadSize() uint32 { return uint32(len(b)) }
func (b LoadBytes) Write(buf *bytes.Buffer, o binary.ByteOrder) error {
_, err := buf.Write(b)
return err
}
func pointerAlign(sz uint32) uint32 {
if (sz % 8) != 0 {
sz += 8 - (sz % 8)
}
return sz
}
/*******************************************************************************
* SEGMENT
*******************************************************************************/
// A SegmentHeader is the header for a Mach-O 32-bit or 64-bit load segment command.
type SegmentHeader struct {
types.LoadCmd
Len uint32
Name string
Addr uint64
Memsz uint64
Offset uint64
Filesz uint64
Maxprot types.VmProtection
Prot types.VmProtection
Nsect uint32
Flag types.SegFlag
Firstsect uint32
}
func (s *SegmentHeader) String() string {
return fmt.Sprintf(
"[SegmentHeader] %s, len=%#x, addr=%#x, memsz=%#x, offset=%#x, filesz=%#x, maxprot=%#x, prot=%#x, nsect=%d, flag=%#x, firstsect=%d",
s.Name, s.Len, s.Addr, s.Memsz, s.Offset, s.Filesz, s.Maxprot, s.Prot, s.Nsect, s.Flag, s.Firstsect)
}
// A Segment represents a Mach-O 32-bit or 64-bit load segment command.
type Segment struct {
SegmentHeader
LoadBytes
sections []*types.Section
// Embed ReaderAt for ReadAt method.
// Do not embed SectionReader directly
// to avoid having Read and Seek.
// If a client wants Read and Seek it must use
// Open() to avoid fighting over the seek offset
// with other clients.
io.ReaderAt
sr *io.SectionReader
}
func (s *Segment) Put32(b []byte, o binary.ByteOrder) int {
o.PutUint32(b[0*4:], uint32(s.LoadCmd))
o.PutUint32(b[1*4:], s.Len)
types.PutAtMost16Bytes(b[2*4:], s.Name)
o.PutUint32(b[6*4:], uint32(s.Addr))
o.PutUint32(b[7*4:], uint32(s.Memsz))
o.PutUint32(b[8*4:], uint32(s.Offset))
o.PutUint32(b[9*4:], uint32(s.Filesz))
o.PutUint32(b[10*4:], uint32(s.Maxprot))
o.PutUint32(b[11*4:], uint32(s.Prot))
o.PutUint32(b[12*4:], s.Nsect)
o.PutUint32(b[13*4:], uint32(s.Flag))
return 14 * 4
}
func (s *Segment) Put64(b []byte, o binary.ByteOrder) int {
o.PutUint32(b[0*4:], uint32(s.LoadCmd))
o.PutUint32(b[1*4:], s.Len)
types.PutAtMost16Bytes(b[2*4:], s.Name)
o.PutUint64(b[6*4+0*8:], s.Addr)
o.PutUint64(b[6*4+1*8:], s.Memsz)
o.PutUint64(b[6*4+2*8:], s.Offset)
o.PutUint64(b[6*4+3*8:], s.Filesz)
o.PutUint32(b[6*4+4*8:], uint32(s.Maxprot))
o.PutUint32(b[7*4+4*8:], uint32(s.Prot))
o.PutUint32(b[8*4+4*8:], s.Nsect)
o.PutUint32(b[9*4+4*8:], uint32(s.Flag))
return 10*4 + 4*8
}
func (s *Segment) LessThan(o *Segment) bool {
return s.Addr < o.Addr
}
func (s *Segment) Write(buf *bytes.Buffer, o binary.ByteOrder) error {
var name [16]byte
copy(name[:], s.Name)
switch s.Command() {
case types.LC_SEGMENT:
if err := binary.Write(buf, o, types.Segment32{
LoadCmd: s.LoadCmd, // /* LC_SEGMENT */
Len: s.Len, // uint32 /* includes sizeof section_64 structs */
Name: name, // [16]byte /* segment name */
Addr: uint32(s.Addr), // uint32 /* memory address of this segment */
Memsz: uint32(s.Memsz), // uint32 /* memory size of this segment */
Offset: uint32(s.Offset), // uint32 /* file offset of this segment */
Filesz: uint32(s.Filesz), // uint32 /* amount to map from the file */
Maxprot: s.Maxprot, // VmProtection /* maximum VM protection */
Prot: s.Prot, // VmProtection /* initial VM protection */
Nsect: s.Nsect, // uint32 /* number of sections in segment */
Flag: s.Flag, // SegFlag /* flags */
}); err != nil {
return fmt.Errorf("failed to write LC_SEGMENT to buffer: %v", err)
}
case types.LC_SEGMENT_64:
if err := binary.Write(buf, o, types.Segment64{
LoadCmd: s.LoadCmd, // /* LC_SEGMENT_64 */
Len: s.Len, // uint32 /* includes sizeof section_64 structs */
Name: name, // [16]byte /* segment name */
Addr: s.Addr, // uint64 /* memory address of this segment */
Memsz: s.Memsz, // uint64 /* memory size of this segment */
Offset: s.Offset, // uint64 /* file offset of this segment */
Filesz: s.Filesz, // uint64 /* amount to map from the file */
Maxprot: s.Maxprot, // VmProtection /* maximum VM protection */
Prot: s.Prot, // VmProtection /* initial VM protection */
Nsect: s.Nsect, // uint32 /* number of sections in segment */
Flag: s.Flag, // SegFlag /* flags */
}); err != nil {
return fmt.Errorf("failed to write LC_SEGMENT to buffer: %v", err)
}
default:
return fmt.Errorf("found unknown segment command: %s", s.Command().String())
}
return nil
}
// Data reads and returns the contents of the segment.
func (s *Segment) Data() ([]byte, error) {
return saferio.ReadDataAt(s.sr, s.Filesz, 0)
}
// Open returns a new ReadSeeker reading the segment.
func (s *Segment) Open() io.ReadSeeker { return io.NewSectionReader(s.sr, 0, 1<<63-1) }
// UncompressedSize returns the size of the segment with its sections uncompressed, ignoring
// its offset within the file. The returned size is rounded up to the power of two in align.
func (s *Segment) UncompressedSize(t *FileTOC, align uint64) uint64 {
sz := uint64(0)
for j := uint32(0); j < s.Nsect; j++ {
c := t.Sections[j+s.Firstsect]
sz += c.UncompressedSize()
}
return (sz + align - 1) & uint64(-int64(align))
}
func (s *Segment) Copy() *Segment {
r := &Segment{SegmentHeader: s.SegmentHeader}
return r
}
func (s *Segment) CopyZeroed() *Segment {
r := s.Copy()
r.Filesz = 0
r.Offset = 0
r.Nsect = 0
r.Firstsect = 0
if s.Command() == types.LC_SEGMENT_64 {
r.Len = uint32(unsafe.Sizeof(types.Segment64{}))
} else {
r.Len = uint32(unsafe.Sizeof(types.Segment32{}))
}
return r
}
func (s *Segment) LoadSize() uint32 {
if s.Command() == types.LC_SEGMENT_64 {
return uint32(unsafe.Sizeof(types.Segment64{})) + uint32(s.Nsect)*uint32(unsafe.Sizeof(types.Section64{}))
}
return uint32(unsafe.Sizeof(types.Segment32{})) + uint32(s.Nsect)*uint32(unsafe.Sizeof(types.Section32{}))
}
func (s *Segment) String() string {
return fmt.Sprintf("%s sz=0x%08x off=0x%08x-0x%08x addr=0x%09x-0x%09x %s/%s %-18s%s",
s.Command(),
s.Filesz,
s.Offset,
s.Offset+s.Filesz,
s.Addr,
s.Addr+s.Memsz,
s.Prot,
s.Maxprot,
s.Name,
s.Flag)
}
func (s *Segment) MarshalJSON() ([]byte, error) {
return json.Marshal(&struct {
LoadCmd string `json:"load_cmd"`
Len uint32 `json:"len,omitempty"`
Name string `json:"name,omitempty"`
Addr uint64 `json:"addr,omitempty"`
Memsz uint64 `json:"memsz,omitempty"`
Offset uint64 `json:"offset,omitempty"`
Filesz uint64 `json:"filesz,omitempty"`
Maxprot string `json:"maxprot,omitempty"`
Prot string `json:"prot,omitempty"`
Nsect uint32 `json:"nsect,omitempty"`
Flags []string `json:"flags,omitempty"`
Sections []*types.Section `json:"sections,omitempty"`
}{
LoadCmd: s.SegmentHeader.LoadCmd.String(),
Len: s.SegmentHeader.Len,
Name: s.SegmentHeader.Name,
Addr: s.SegmentHeader.Addr,
Memsz: s.SegmentHeader.Memsz,
Offset: s.SegmentHeader.Offset,
Filesz: s.SegmentHeader.Filesz,
Maxprot: s.SegmentHeader.Maxprot.String(),
Prot: s.SegmentHeader.Prot.String(),
Nsect: s.SegmentHeader.Nsect,
Flags: s.SegmentHeader.Flag.List(),
Sections: s.sections,
})
}
type Segments []*Segment
func (v Segments) Len() int {
return len(v)
}
func (v Segments) Less(i, j int) bool {
return v[i].LessThan(v[j])
}
func (v Segments) Swap(i, j int) {
v[i], v[j] = v[j], v[i]
}
/*******************************************************************************
* LC_SYMTAB
*******************************************************************************/
// A Symtab represents a Mach-O LC_SYMTAB command.
type Symtab struct {
LoadBytes
types.SymtabCmd
Syms []Symbol
}
func (s *Symtab) LoadSize() uint32 {
return uint32(binary.Size(s.SymtabCmd))
}
func (s *Symtab) Put(b []byte, o binary.ByteOrder) int {
o.PutUint32(b[0*4:], uint32(s.LoadCmd))
o.PutUint32(b[1*4:], s.Len)
o.PutUint32(b[2*4:], s.Symoff)
o.PutUint32(b[3*4:], s.Nsyms)
o.PutUint32(b[4*4:], s.Stroff)
o.PutUint32(b[5*4:], s.Strsize)
return 6 * 4
}
func (s *Symtab) Write(buf *bytes.Buffer, o binary.ByteOrder) error {
if err := binary.Write(buf, o, s.SymtabCmd); err != nil {
return fmt.Errorf("failed to write %s to buffer: %v", s.Command(), err)
}
return nil
}
func (s *Symtab) Search(name string) (*Symbol, error) {
for _, sym := range s.Syms {
if sym.Name == name {
return &sym, nil
}
}
return nil, fmt.Errorf("%s not found in symtab", name)
}
func (s *Symtab) String() string {
if s.Nsyms == 0 && s.Strsize == 0 {
return "Symbols stripped"
}
return fmt.Sprintf("Symbol offset=0x%08X, Num Syms: %d, String offset=0x%08X-0x%08X", s.Symoff, s.Nsyms, s.Stroff, s.Stroff+s.Strsize)
}
func (s *Symtab) MarshalJSON() ([]byte, error) {
return json.Marshal(&struct {
LoadCmd string `json:"load_cmd"`
Len uint32 `json:"len,omitempty"`
Symoff uint32 `json:"symoff,omitempty"`
Nsyms uint32 `json:"nsyms,omitempty"`
Stroff uint32 `json:"stroff,omitempty"`
Strsize uint32 `json:"strsize,omitempty"`
Count int `json:"count,omitempty"`
}{
LoadCmd: s.LoadCmd.String(),
Len: s.Len,
Symoff: s.Symoff,
Nsyms: s.Nsyms,
Stroff: s.Stroff,
Strsize: s.Strsize,
Count: len(s.Syms),
})
}
// A Symbol is a Mach-O 32-bit or 64-bit symbol table entry.
type Symbol struct {
Name string
Type types.NType
Sect uint8
Desc types.NDescType
Value uint64
}
func (s Symbol) GetType(m *File) string {
var typ string
if s.Type.IsUndefinedSym() {
if s.Value != 0 {
typ += "(common) "
if s.Desc.GetCommAlign() != 0 {
typ += fmt.Sprintf("(alignment 2^%d)", s.Desc.GetCommAlign())
}
} else {
if s.Type.IsPreboundUndefinedSym() {
typ += "(prebound "
} else {
typ += "("
}
if s.Desc.IsUndefinedLazy() {
typ += "undefined [lazy bound]) "
} else if s.Desc.IsPrivateUndefinedLazy() {
typ += "undefined [private lazy bound]) "
} else if s.Desc.IsPrivateUndefinedNonLazy() {
typ += "undefined [private]) "
} else {
typ += "undefined) "
}
}
} else if s.Type.IsAbsoluteSym() {
typ += "(absolute) "
} else if s.Type.IsIndirectSym() {
typ += "(indirect) "
} else if s.Type.IsDefinedInSection() {
if s.Sect != types.NO_SECT && int(s.Sect) <= len(m.Sections) {
typ += fmt.Sprintf("(%s,%s) ", m.Sections[s.Sect-1].Seg, m.Sections[s.Sect-1].Name)
}
} else if s.Type.IsDebugSym() {
typ += "(debug) "
} else {
typ += "(?) "
}
if s.Type.IsExternalSym() {
if s.Desc.IsReferencedDynamically() {
typ += "[referenced dynamically] "
}
if s.Type.IsPrivateExternalSym() {
if s.Desc.IsWeakDefintion() {
typ += "weak private external "
} else {
typ += "private external "
}
} else {
if s.Desc.IsWeakReferenced() || s.Desc.IsWeakDefintion() {
if s.Desc.IsWeakDefintionOrReferenced() {
typ += "weak external automatically hidden "
} else {
typ += "weak external "
}
} else {
typ += "external "
}
}
} else {
if s.Type.IsPrivateExternalSym() {
typ += "non-external (was a private external) "
} else {
typ += "private "
}
}
if m.Type == types.MH_OBJECT {
if s.Desc.IsNoDeadStrip() {
typ += "[no dead strip] "
}
if !s.Type.IsUndefinedSym() && s.Desc.IsSymbolResolver() {
typ += "[symbol resolver] "
}
if !s.Type.IsUndefinedSym() && s.Desc.IsAltEntry() {
typ += "[alt entry] "
}
if !s.Type.IsUndefinedSym() && s.Desc.IsColdFunc() {
typ += "[cold func] "
}
}
if s.Desc.IsArmThumbDefintion() {
typ += "[Thumb] "
}
if s.Type.IsIndirectSym() {
// typ += fmt.Sprintf("(for %s)", s.Name) FIXME: find indirect symbol example
}
return strings.TrimSpace(typ)
}
func (s Symbol) GetLib(m *File) string {
if (m.Flags.TwoLevel() && s.Type.IsUndefinedSym() && s.Value == 0) || s.Type.IsPreboundUndefinedSym() {
if s.Desc.GetLibraryOrdinal() > types.SELF_LIBRARY_ORDINAL {
switch s.Desc.GetLibraryOrdinal() {
case types.EXECUTABLE_ORDINAL:
return " (from executable)"
case types.DYNAMIC_LOOKUP_ORDINAL:
return " (dynamically looked up)"
default:
if s.Desc.GetLibraryOrdinal() <= uint16(len(m.ImportedLibraries())) {
return fmt.Sprintf(" (from %s)", filepath.Base(m.ImportedLibraries()[s.Desc.GetLibraryOrdinal()-1]))
} else {
return fmt.Sprintf(" (from bad library ordinal %d)", s.Desc.GetLibraryOrdinal())
}
}
}
}
return ""
}
func (s Symbol) String(m *File) string {
return fmt.Sprintf("0x%016X\t%s\t%s%s", s.Value, s.GetType(m), s.Name, s.GetLib(m))
}
func (s *Symbol) MarshalJSON() ([]byte, error) {
return json.Marshal(&struct {
Name string `json:"name"`
Type string `json:"type"`
Sect uint8 `json:"sect"`
Desc string `json:"desc"`
Value uint64 `json:"value"`
}{
Name: s.Name,
Type: s.Type.String(fmt.Sprintf("sect_num=%d", s.Sect)),
Sect: s.Sect,
Desc: s.Desc.String(),
Value: s.Value,
})
}
/*******************************************************************************
* LC_SYMSEG - link-edit gdb symbol table info (obsolete)
*******************************************************************************/
// A SymSeg represents a Mach-O LC_SYMSEG command.
type SymSeg struct {
LoadBytes
types.SymsegCmd
}
func (s *SymSeg) LoadSize() uint32 {
return uint32(binary.Size(s.SymsegCmd))
}
func (s *SymSeg) Write(buf *bytes.Buffer, o binary.ByteOrder) error {
if err := binary.Write(buf, o, s.SymsegCmd); err != nil {
return fmt.Errorf("failed to write %s to buffer: %v", s.Command(), err)
}
return nil
}
func (s *SymSeg) String() string {
return fmt.Sprintf("offset=0x%08x-0x%08x size=%5d", s.Offset, s.Offset+s.Size, s.Size)
}
func (s *SymSeg) MarshalJSON() ([]byte, error) {
return json.Marshal(&struct {
LoadCmd string `json:"load_cmd"`
Len uint32 `json:"len,omitempty"`
Offset uint32 `json:"offset,omitempty"`
Size uint32 `json:"size,omitempty"`
}{
LoadCmd: s.LoadCmd.String(),
Len: s.Len,
Offset: s.Offset,
Size: s.Size,
})
}
/*******************************************************************************
* LC_THREAD
*******************************************************************************/
// A Thread represents a Mach-O LC_THREAD command.
type Thread struct {
LoadBytes
types.ThreadCmd
bo binary.ByteOrder
IsArm bool
Threads []types.ThreadState
}
func (t *Thread) LoadSize() uint32 {
return uint32(binary.Size(t.ThreadCmd))
}
func (t *Thread) Write(buf *bytes.Buffer, o binary.ByteOrder) error {
if err := binary.Write(buf, o, t.ThreadCmd); err != nil {
return fmt.Errorf("failed to write %s to buffer: %v", t.Command(), err)
}
for _, thread := range t.Threads {
if err := binary.Write(buf, o, thread.Flavor); err != nil {
return fmt.Errorf("failed to write thread_state flavor to %s buffer: %v", t.Command(), err)
}
if err := binary.Write(buf, o, thread.Count); err != nil {
return fmt.Errorf("failed to write thread_state count to %s buffer: %v", t.Command(), err)
}
if err := binary.Write(buf, o, thread.Data[:]); err != nil {
return fmt.Errorf("failed to write thread_state data to %s buffer: %v", t.Command(), err)
}
}
return nil
}
func (t *Thread) String() string {
regPadding := 9
padding := strings.Repeat(" ", 7)
var out []string
for _, thread := range t.Threads {
var flavor any
if t.IsArm {
flavor = types.ArmThreadFlavor(thread.Flavor)
} else {
flavor = types.X86ThreadFlavor(thread.Flavor)
}
switch flavor {
case types.X86_THREAD_STATE32:
var regs Regs386
binary.Read(bytes.NewReader(thread.Data), t.bo, ®s)
out = append(out, fmt.Sprintf("%s%s:\n%s", padding, flavor, regs.String(regPadding)))
case types.X86_THREAD_STATE64:
var regs RegsAMD64
binary.Read(bytes.NewReader(thread.Data), t.bo, ®s)
out = append(out, fmt.Sprintf("%s%s:\n%s", padding, flavor, regs.String(regPadding)))
case types.ARM_THREAD_STATE32:
var regs RegsARM
binary.Read(bytes.NewReader(thread.Data), t.bo, ®s)
if regs.OnlyEntry() {
out = append(out, fmt.Sprintf("%s%s Entry: %#08x", padding, flavor, regs.PC))
} else {
out = append(out, fmt.Sprintf("%s%s:\n%s", padding, flavor, regs.String(regPadding)))
}
out = append(out, fmt.Sprintf("%s%s:\n%s", padding, flavor, regs.String(regPadding)))
case types.ARM_THREAD_STATE64:
var regs RegsARM64
binary.Read(bytes.NewReader(thread.Data), t.bo, ®s)
if regs.OnlyEntry() {
out = append(out, fmt.Sprintf("%s%s Entry: %#016x", padding, flavor, regs.PC))
} else {
out = append(out, fmt.Sprintf("%s%s:\n%s", padding, flavor, regs.String(regPadding)))
}
case types.ARM_EXCEPTION_STATE:
var regs ArmExceptionState
binary.Read(bytes.NewReader(thread.Data), t.bo, ®s)
out = append(out, fmt.Sprintf("%s%s:\n%s", padding, flavor, regs.String(regPadding)))
case types.ARM_EXCEPTION_STATE64:
var regs ArmExceptionState64
binary.Read(bytes.NewReader(thread.Data), t.bo, ®s)
out = append(out, fmt.Sprintf("%s%s:\n%s", padding, flavor, regs.String(regPadding)))
default:
out = append(out, fmt.Sprintf("%s%s", padding, flavor))
}
}
return fmt.Sprintf("Threads: %d\n%s", len(t.Threads), strings.Join(out, "\n"))
}
func (t *Thread) MarshalJSON() ([]byte, error) {
return json.Marshal(&struct {
LoadCmd string `json:"load_cmd"`
Len uint32 `json:"len,omitempty"`
Threads []types.ThreadState `json:"threads,omitempty"`
}{
LoadCmd: t.LoadCmd.String(),
Len: t.Len,
Threads: t.Threads,
})
}
/*******************************************************************************
* LC_UNIXTHREAD
*******************************************************************************/
// A UnixThread represents a Mach-O LC_UNIXTHREAD command.
type UnixThread struct {
Thread
}
/*******************************************************************************
* LC_LOADFVMLIB - load a specified fixed VM shared library
*******************************************************************************/
// A LoadFvmlib represents a Mach-O LC_LOADFVMLIB command.
type LoadFvmlib struct {
LoadBytes
types.LoadFvmLibCmd
Name string
}
func (l *LoadFvmlib) LoadSize() uint32 {
return pointerAlign(uint32(binary.Size(l.LoadFvmLibCmd) + len(l.Name) + 1))
}
func (l *LoadFvmlib) Write(buf *bytes.Buffer, o binary.ByteOrder) error {
if err := binary.Write(buf, o, l.LoadFvmLibCmd); err != nil {
return fmt.Errorf("failed to write %s to buffer: %v", l.Command(), err)
}
if _, err := buf.WriteString(l.Name + "\x00"); err != nil {
return fmt.Errorf("failed to write %s to %s buffer: %v", l.Name, l.Command(), err)
}
if (buf.Len() % 8) != 0 {
pad := 8 - (buf.Len() % 8)
if _, err := buf.Write(make([]byte, pad)); err != nil {
return fmt.Errorf("failed to write %s padding: %v", l.Command(), err)
}
}
return nil
}
func (l *LoadFvmlib) String() string {
return fmt.Sprintf("%s (%s), Header Addr: %#08x", l.Name, l.MinorVersion, l.HeaderAddr)
}
func (l *LoadFvmlib) MarshalJSON() ([]byte, error) {
return json.Marshal(&struct {
LoadCmd string `json:"load_cmd"`
Len uint32 `json:"len,omitempty"`
Name string `json:"name,omitempty"`
MinorVersion string `json:"minor_version,omitempty"`
HeaderAddress uint32 `json:"header_addr,omitempty"`
}{
LoadCmd: l.LoadCmd.String(),
Len: l.Len,
Name: l.Name,
MinorVersion: l.MinorVersion.String(),
HeaderAddress: l.HeaderAddr,
})
}
/*******************************************************************************
* LC_IDFVMLIB - fixed VM shared library identification
*******************************************************************************/
// A IDFvmlib represents a Mach-O LC_IDFVMLIB command.
type IDFvmlib struct {
LoadFvmlib
}
/*******************************************************************************
* LC_IDENT - object identification info (obsolete)
*******************************************************************************/
// A Ident represents a Mach-O LC_IDENT command.
type Ident struct {
LoadBytes
types.IdentCmd
StrTable []string
}
func (i *Ident) LoadSize() uint32 {
sz := uint32(binary.Size(i.IdentCmd))
for _, str := range i.StrTable {
sz += uint32(len(str) + 1)
}
if (sz % 4) != 0 {
sz = 4 - (sz % 4)
}
return sz
}
func (i *Ident) Write(buf *bytes.Buffer, o binary.ByteOrder) error {
if err := binary.Write(buf, o, i.IdentCmd); err != nil {
return fmt.Errorf("failed to write %s to buffer: %v", i.Command(), err)
}
for _, str := range i.StrTable {
if _, err := buf.WriteString(str + "\x00"); err != nil {
return fmt.Errorf("failed to write %s to %s buffer: %v", str, i.Command(), err)
}
}
if (buf.Len() % 4) != 0 {
pad := 4 - (buf.Len() % 4)
if _, err := buf.Write(make([]byte, pad)); err != nil {
return fmt.Errorf("failed to write %s padding: %v", i.Command(), err)
}
}
return nil
}
func (i *Ident) String() string {
return fmt.Sprintf("str_count=%d", len(i.StrTable))
}
func (i *Ident) MarshalJSON() ([]byte, error) {
return json.Marshal(&struct {
LoadCmd string `json:"load_cmd"`
Len uint32 `json:"len,omitempty"`
Strings []string `json:"strings,omitempty"`
}{
LoadCmd: i.LoadCmd.String(),
Len: i.Len,
Strings: i.StrTable,
})
}
/*******************************************************************************
* LC_FVMFILE - fixed VM file inclusion (internal use)
*******************************************************************************/
// A FvmFile represents a Mach-O LC_FVMFILE command.
type FvmFile struct {
LoadBytes
types.FvmFileCmd
Name string
}
func (l *FvmFile) LoadSize() uint32 {
return pointerAlign(uint32(binary.Size(l.FvmFileCmd) + len(l.Name) + 1))
}
func (l *FvmFile) Write(buf *bytes.Buffer, o binary.ByteOrder) error {
if err := binary.Write(buf, o, l.FvmFileCmd); err != nil {
return fmt.Errorf("failed to write %s to buffer: %v", l.Command(), err)
}
if _, err := buf.WriteString(l.Name + "\x00"); err != nil {
return fmt.Errorf("failed to write %s to %s buffer: %v", l.Name, l.Command(), err)
}
if (buf.Len() % 8) != 0 {
pad := 8 - (buf.Len() % 8)
if _, err := buf.Write(make([]byte, pad)); err != nil {
return fmt.Errorf("failed to write %s padding: %v", l.Command(), err)
}
}
return nil
}
func (l *FvmFile) String() string {
return fmt.Sprintf("%s, Header Addr: %#08x", l.Name, l.HeaderAddr)
}
func (l *FvmFile) MarshalJSON() ([]byte, error) {
return json.Marshal(&struct {
LoadCmd string `json:"load_cmd"`
Len uint32 `json:"len,omitempty"`
Name string `json:"name,omitempty"`
HeaderAddress uint32 `json:"header_addr,omitempty"`
}{
LoadCmd: l.LoadCmd.String(),
Len: l.Len,
Name: l.Name,
HeaderAddress: l.HeaderAddr,
})
}
/*******************************************************************************
* LC_PREPAGE - prepage command (internal use)
*******************************************************************************/
// A Prepage represents a Mach-O LC_PREPAGE command.
type Prepage struct {
LoadBytes
types.PrePageCmd
}
func (c *Prepage) LoadSize() uint32 {
return uint32(binary.Size(c.PrePageCmd))
}
func (c *Prepage) Write(buf *bytes.Buffer, o binary.ByteOrder) error {
if err := binary.Write(buf, o, c.PrePageCmd); err != nil {
return fmt.Errorf("failed to write %s to buffer: %v", c.Command(), err)
}
return nil
}
func (c *Prepage) String() string {
return fmt.Sprintf("size=%d", c.Len)
}
func (c *Prepage) MarshalJSON() ([]byte, error) {
return json.Marshal(&struct {
LoadCmd string `json:"load_cmd"`
Len uint32 `json:"len,omitempty"`
}{
LoadCmd: c.LoadCmd.String(),
Len: c.Len,
})
}
/*******************************************************************************
* LC_DYSYMTAB
*******************************************************************************/
// A Dysymtab represents a Mach-O LC_DYSYMTAB command.
type Dysymtab struct {
LoadBytes
types.DysymtabCmd
IndirectSyms []uint32 // indices into Symtab.Syms
}
func (d *Dysymtab) LoadSize() uint32 {
return uint32(binary.Size(d.DysymtabCmd))
}
func (d *Dysymtab) Write(buf *bytes.Buffer, o binary.ByteOrder) error {
if err := binary.Write(buf, o, d.DysymtabCmd); err != nil {
return fmt.Errorf("failed to write %s to buffer: %v", d.Command(), err)
}
return nil
}
func (d *Dysymtab) String() string {
var tocStr, modStr, extSymStr, indirSymStr, extRelStr, locRelStr string
if d.Ntoc == 0 {
tocStr = "No"
} else {
tocStr = fmt.Sprintf("%d at 0x%08x", d.Ntoc, d.Tocoffset)
}
if d.Nmodtab == 0 {
modStr = "No"
} else {
modStr = fmt.Sprintf("%d at 0x%08x", d.Nmodtab, d.Modtaboff)
}
if d.Nextrefsyms == 0 {
extSymStr = "None"
} else {
extSymStr = fmt.Sprintf("%d at 0x%08x", d.Nextrefsyms, d.Extrefsymoff)
}
if d.Nindirectsyms == 0 {
indirSymStr = "None"
} else {
indirSymStr = fmt.Sprintf("%d at 0x%08x", d.Nindirectsyms, d.Indirectsymoff)
}
if d.Nextrel == 0 {
extRelStr = "None"
} else {
extRelStr = fmt.Sprintf("%d at 0x%08x", d.Nextrel, d.Extreloff)
}
if d.Nlocrel == 0 {
locRelStr = "None"
} else {
locRelStr = fmt.Sprintf("%d at 0x%08x", d.Nlocrel, d.Locreloff)
}
return fmt.Sprintf(
"\n"+
"\t Local Syms: %d at %d\n"+
"\t External Syms: %d at %d\n"+
"\t Undefined Syms: %d at %d\n"+
"\t TOC: %s\n"+
"\t Modtab: %s\n"+
"\tExternal symtab Entries: %s\n"+
"\tIndirect symtab Entries: %s\n"+
"\t External Reloc Entries: %s\n"+
"\t Local Reloc Entries: %s",
d.Nlocalsym, d.Ilocalsym,
d.Nextdefsym, d.Iextdefsym,
d.Nundefsym, d.Iundefsym,
tocStr,
modStr,
extSymStr,
indirSymStr,
extRelStr,
locRelStr)
}
func (d *Dysymtab) MarshalJSON() ([]byte, error) {
return json.Marshal(struct {
LoadCmd string `json:"load_cmd"`
Len uint32 `json:"length"`
Ilocalsym uint32 `json:"ilocalsym"`
Nlocalsym uint32 `json:"nlocalsym"`
Iextdefsym uint32 `json:"iextdefsym"`
Nextdefsym uint32 `json:"nextdefsym"`
Iundefsym uint32 `json:"iundefsym"`
Nundefsym uint32 `json:"nundefsym"`
Tocoffset uint32 `json:"tocoffset"`
Ntoc uint32 `json:"ntoc"`
Modtaboff uint32 `json:"modtaboff"`
Nmodtab uint32 `json:"nmodtab"`
Extrefsymoff uint32 `json:"extrefsymoff"`
Nextrefsyms uint32 `json:"nextrefsyms"`
Indirectsymoff uint32 `json:"indirectsymoff"`
Nindirectsyms uint32 `json:"nindirectsyms"`
Extreloff uint32 `json:"extreloff"`
Nextrel uint32 `json:"nextrel"`
Locreloff uint32 `json:"locreloff"`
Nlocrel uint32 `json:"nlocrel"`
}{
LoadCmd: d.Command().String(),
Len: d.LoadSize(),
Ilocalsym: d.Ilocalsym,
Nlocalsym: d.Nlocalsym,
Iextdefsym: d.Iextdefsym,
Nextdefsym: d.Nextdefsym,
Iundefsym: d.Iundefsym,
Nundefsym: d.Nundefsym,
Tocoffset: d.Tocoffset,
Ntoc: d.Ntoc,
Modtaboff: d.Modtaboff,
Nmodtab: d.Nmodtab,
Extrefsymoff: d.Extrefsymoff,
Nextrefsyms: d.Nextrefsyms,
Indirectsymoff: d.Indirectsymoff,
Nindirectsyms: d.Nindirectsyms,
Extreloff: d.Extreloff,
Nextrel: d.Nextrel,
Locreloff: d.Locreloff,
Nlocrel: d.Nlocrel,
})
}
/*******************************************************************************
* LC_LOAD_DYLIB
*******************************************************************************/
// A LoadDylib represents a Mach-O LC_LOAD_DYLIB command.
type LoadDylib struct {
Dylib
}
/*******************************************************************************
* LC_ID_DYLIB
*******************************************************************************/
// A IDDylib represents a Mach-O LC_ID_DYLIB command.
type IDDylib struct {
Dylib
}
/*******************************************************************************
* LC_LOAD_DYLINKER
*******************************************************************************/
// A LoadDylinker represents a Mach-O LC_LOAD_DYLINKER command.
type LoadDylinker struct {
Dylinker
}
/*******************************************************************************
* LC_ID_DYLINKER
*******************************************************************************/
// DylinkerID represents a Mach-O LC_ID_DYLINKER command.
type DylinkerID struct {
Dylinker
}
/*******************************************************************************
* LC_PREBOUND_DYLIB - modules prebound for a dynamically linked shared library
*******************************************************************************/
// PreboundDylib represents a Mach-O LC_PREBOUND_DYLIB command.
type PreboundDylib struct {