func hasDynTag(f *elf.File, tag elf.DynTag) bool {
ds := f.SectionByType(elf.SHT_DYNAMIC)
if ds == nil {
return false
}
d, err := ds.Data()
if err != nil {
return false
}
for len(d) > 0 {
var t elf.DynTag
switch f.Class {
case elf.ELFCLASS32:
t = elf.DynTag(f.ByteOrder.Uint32(d[0:4]))
d = d[8:]
case elf.ELFCLASS64:
t = elf.DynTag(f.ByteOrder.Uint64(d[0:8]))
d = d[16:]
}
if t == tag {
return true
}
}
return false
}
func hasDynTag(t *testing.T, f *elf.File, tag elf.DynTag) bool {
ds := f.SectionByType(elf.SHT_DYNAMIC)
if ds == nil {
t.Error("no SHT_DYNAMIC section")
return false
}
d, err := ds.Data()
if err != nil {
t.Errorf("can't read SHT_DYNAMIC contents: %v", err)
return false
}
for len(d) > 0 {
var t elf.DynTag
switch f.Class {
case elf.ELFCLASS32:
t = elf.DynTag(f.ByteOrder.Uint32(d[:4]))
d = d[8:]
case elf.ELFCLASS64:
t = elf.DynTag(f.ByteOrder.Uint64(d[:8]))
d = d[16:]
}
if t == tag {
return true
}
}
return false
}
func Soname(data []byte) (so string, ok bool) {
e, err := elf.NewFile(bytes.NewReader(data))
if err != nil {
return so, false
}
section := e.Section(".dynamic")
if section == nil {
// not a dynamic binary.
return so, false
}
// e.stringtable(section.Link)
dynstr, _ := e.Sections[section.Link].Data()
switch e.Class {
case elf.ELFCLASS64:
n := section.Size / 16 // 2*sizeof(uintptr)
values := make([]elf.Dyn64, n)
binary.Read(section.Open(), binary.LittleEndian, values)
for _, v := range values {
if elf.DynTag(v.Tag) == elf.DT_SONAME {
return getstring(dynstr, int(v.Val)), true
}
}
case elf.ELFCLASS32:
n := section.Size / 8
values := make([]elf.Dyn32, n)
binary.Read(section.Open(), binary.LittleEndian, values)
for _, v := range values {
if elf.DynTag(v.Tag) == elf.DT_SONAME {
return getstring(dynstr, int(v.Val)), true
}
}
}
return "", false
}
func haveDynTag(file *elf.File, tag elf.DynTag) bool {
if section := file.Section(".dynamic"); section != nil {
reader := io.NewSectionReader(section, 0, int64(section.Size))
switch file.Machine {
case elf.EM_X86_64:
for {
var entry elf.Dyn64
if err := binary.Read(reader, binary.LittleEndian, &entry); err != io.EOF {
if elf.DynTag(entry.Tag) == tag {
return true
}
} else {
break
}
}
case elf.EM_386:
for {
var entry elf.Dyn32
if err := binary.Read(reader, binary.LittleEndian, &entry); err != io.EOF {
if elf.DynTag(entry.Tag) == tag {
return true
}
} else {
break
}
}
}
}
return false
}
func Depends(data []byte) (needed []string, err error) {
e, err := elf.NewFile(bytes.NewReader(data))
if err != nil {
return nil, err
}
section := e.Section(".dynamic")
if section == nil {
// not a dynamic binary.
return nil, nil
}
// e.stringtable(section.Link)
dynstr, _ := e.Sections[section.Link].Data()
switch e.Class {
case elf.ELFCLASS64:
n := section.Size / 16 // 2*sizeof(uintptr)
values := make([]elf.Dyn64, n)
binary.Read(section.Open(), binary.LittleEndian, values)
for _, v := range values {
if elf.DynTag(v.Tag) == elf.DT_NEEDED {
so := getstring(dynstr, int(v.Val))
needed = append(needed, so)
}
}
case elf.ELFCLASS32:
n := section.Size / 8
values := make([]elf.Dyn32, n)
binary.Read(section.Open(), binary.LittleEndian, values)
for _, v := range values {
if elf.DynTag(v.Tag) == elf.DT_NEEDED {
so := getstring(dynstr, int(v.Val))
needed = append(needed, so)
}
}
}
return needed, nil
}
