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main.go
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main.go
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package readelf
import (
"bytes"
"debug/elf"
"encoding/binary"
"errors"
"fmt"
"io"
"os"
"strings"
"unsafe"
)
func (elfFs *ELFFile) setArch() {
switch elf.Class(elfFs.Ident[elf.EI_CLASS]) {
case elf.ELFCLASS64:
elfFs.Hdr = new(elf.Header64)
elfFs.FileHdr.Arch = elf.ELFCLASS64
case elf.ELFCLASS32:
elfFs.Hdr = new(elf.Header32)
elfFs.FileHdr.Arch = elf.ELFCLASS32
default:
fmt.Println("Elf Arch Class Invalid !")
os.Exit(1)
}
}
func (elfFs *ELFFile) mapHeader() {
switch elf.Data(elfFs.Ident[elf.EI_DATA]) {
case elf.ELFDATA2LSB:
elfFs.FileHdr.Endianness = binary.LittleEndian
case elf.ELFDATA2MSB:
elfFs.FileHdr.Endianness = binary.BigEndian
default:
fmt.Println("Possible Corruption, Endianness unknown")
}
elfFs.Fh.Seek(0, io.SeekStart)
err := binary.Read(elfFs.Fh, elfFs.FileHdr.Endianness, elfFs.Hdr)
checkError(err)
switch h := elfFs.Hdr.(type) {
case *elf.Header32:
elfFs.FileHdr.Machine = elf.Machine(h.Machine)
case *elf.Header64:
elfFs.FileHdr.Machine = elf.Machine(h.Machine)
}
}
//Section Header Table Offset = Shoff
//Number of Section Header Table Entries = Shnum
//Size per entry in Section Header Table = Shentsize
//Calculate the size of Section Header Table = Shnum * Shentsize
func (elfFs *ELFFile) getSections() {
if h, ok := elfFs.Hdr.(*elf.Header64); ok {
shdrTableSize := h.Shentsize * h.Shnum
elfFs.ElfSections.Section = make([]elf.Section64, h.Shnum)
elfFs.ElfSections.SectionName = make([]string, h.Shnum)
sr := io.NewSectionReader(elfFs.Fh, int64(h.Shoff), int64(shdrTableSize))
err := binary.Read(sr, elfFs.FileHdr.Endianness, elfFs.ElfSections.Section.([]elf.Section64))
checkError(err)
shstrtab := make([]byte, elfFs.ElfSections.Section.([]elf.Section64)[h.Shstrndx].Size)
shstrtabOff := elfFs.ElfSections.Section.([]elf.Section64)[h.Shstrndx].Off
shstrtabSize := elfFs.ElfSections.Section.([]elf.Section64)[h.Shstrndx].Size
shstrtabSec := io.NewSectionReader(elfFs.Fh, int64(shstrtabOff), int64(shstrtabSize)+int64(shstrtabOff))
err = binary.Read(shstrtabSec, elfFs.FileHdr.Endianness, shstrtab)
checkError(err)
for i := 0; i < int(h.Shnum); i++ {
sIndex := elfFs.ElfSections.Section.([]elf.Section64)[i].Name
elfFs.ElfSections.SectionName[i] = getSectionName(sIndex, shstrtab)
}
}
if h, ok := elfFs.Hdr.(*elf.Header32); ok {
shdrTableSize := h.Shentsize * h.Shnum
elfFs.ElfSections.Section = make([]elf.Section32, h.Shnum)
elfFs.ElfSections.SectionName = make([]string, h.Shnum)
sr := io.NewSectionReader(elfFs.Fh, int64(h.Shoff), int64(shdrTableSize))
err := binary.Read(sr, elfFs.FileHdr.Endianness, elfFs.ElfSections.Section.([]elf.Section32))
checkError(err)
shstrtab := make([]byte, elfFs.ElfSections.Section.([]elf.Section32)[h.Shstrndx].Size)
shstrtabOff := elfFs.ElfSections.Section.([]elf.Section32)[h.Shstrndx].Off
shstrtabSize := elfFs.ElfSections.Section.([]elf.Section32)[h.Shstrndx].Size
shstrTableEnd := shstrtabOff + shstrtabSize
shstrtabSec := io.NewSectionReader(elfFs.Fh, int64(shstrtabOff), int64(shstrTableEnd))
err = binary.Read(shstrtabSec, elfFs.FileHdr.Endianness, shstrtab)
checkError(err)
for i := 0; i < int(h.Shnum); i++ {
sIndex := elfFs.ElfSections.Section.([]elf.Section32)[i].Name
elfFs.ElfSections.SectionName[i] = getSectionName(sIndex, shstrtab)
}
}
}
func (elfFs *ELFFile) getSymbols_bygrep(need string) GrepOut {
var dsymtabNdx uint32
var out GrepOut
if dsymtabNdx = getSectionNdx(".dynsym", elfFs); dsymtabNdx != 0 {
var dynstrNdx uint32
dynstrNdx = getSectionNdx(".dynstr", elfFs)
elfFs.loadSymbols(dsymtabNdx, dynstrNdx, DynSym)
//fmt.Printf("%d entries found in .dynsym\n", len(elfFs.DynSymbols))
out = printSymbols_grep(elfFs, need)
if out.Name != "" {
return out
}
} else {
//fmt.Println("No Dynamic symbols found - .dynsym missing from target")
}
var symtabNdx uint32
var symstrNdx uint32
if symtabNdx = getSectionNdx(".symtab", elfFs); symtabNdx != 0 {
symstrNdx = getSectionNdx(".strtab", elfFs)
elfFs.loadSymbols(symtabNdx, symstrNdx, Sym)
//fmt.Printf("%d entries found in .symtab\n", len(elfFs.Symbols))
out = printSymbols_grep(elfFs, need)
if out.Name != "" {
return out
}
} else {
//fmt.Println("Section .symtab mising -- Binary is stripped no exported symbols available !")
}
return out
}
func (elfFs *ELFFile) getSymbols() {
var dsymtabNdx uint32
if dsymtabNdx = getSectionNdx(".dynsym", elfFs); dsymtabNdx != 0 {
var dynstrNdx uint32
dynstrNdx = getSectionNdx(".dynstr", elfFs)
elfFs.loadSymbols(dsymtabNdx, dynstrNdx, DynSym)
fmt.Printf("%d entries found in .dynsym\n", len(elfFs.DynSymbols))
printSymbols(elfFs)
} else {
fmt.Println("No Dynamic symbols found - .dynsym missing from target")
}
var symtabNdx uint32
var symstrNdx uint32
if symtabNdx = getSectionNdx(".symtab", elfFs); symtabNdx != 0 {
symstrNdx = getSectionNdx(".strtab", elfFs)
elfFs.loadSymbols(symtabNdx, symstrNdx, Sym)
fmt.Printf("%d entries found in .symtab\n", len(elfFs.Symbols))
printSymbols(elfFs)
} else {
fmt.Println("Section .symtab mising -- Binary is stripped no exported symbols available !")
}
}
func (elfFs *ELFFile) loadSymbols(sectionNdx uint32, symstrNdx uint32, symType int) {
switch elfFs.FileHdr.Arch {
case elf.ELFCLASS32:
var sym32 elf.Sym32
symSize := uint32(unsafe.Sizeof(sym32))
symtabSize := elfFs.ElfSections.Section.([]elf.Section32)[sectionNdx].Size
numSymbols := symtabSize / symSize
off := elfFs.ElfSections.Section.([]elf.Section32)[sectionNdx].Off
/* strtab can be either .dynstr or .strtab depending on the symbol table*/
strtab := make([]byte, elfFs.ElfSections.Section.([]elf.Section32)[symstrNdx].Size)
strtabOff := elfFs.ElfSections.Section.([]elf.Section32)[symstrNdx].Off
strtabSize := elfFs.ElfSections.Section.([]elf.Section32)[symstrNdx].Size
n := int64(strtabOff + strtabSize)
shstrtabSec := io.NewSectionReader(elfFs.Fh, int64(strtabOff), n)
err := binary.Read(shstrtabSec, elfFs.FileHdr.Endianness, strtab)
checkError(err)
if symType == Sym {
elfFs.Symbols = make(map[uint32]interface{})
elfFs.SymbolsName = make(map[uint32]string)
n := int64(off + symtabSize)
sr := io.NewSectionReader(elfFs.Fh, int64(off), n)
for symNdx := uint32(0); symNdx < numSymbols; symNdx++ {
elfFs.Symbols[symNdx] = new(elf.Sym32)
err := binary.Read(sr, elfFs.FileHdr.Endianness, elfFs.Symbols[symNdx])
checkError(err)
symEntry := elfFs.Symbols[symNdx]
elfFs.SymbolsName[symEntry.(*elf.Sym32).Name] = getSymbolName(symEntry.(*elf.Sym32).Name, strtab)
}
}
if symType == DynSym {
elfFs.DynSymbols = make(map[uint32]interface{})
elfFs.DynSymbolsName = make(map[uint32]string)
n := int64(off + symtabSize)
sr := io.NewSectionReader(elfFs.Fh, int64(off), n)
for symNdx := uint32(0); symNdx < numSymbols; symNdx++ {
elfFs.DynSymbols[symNdx] = new(elf.Sym32)
err := binary.Read(sr, elfFs.FileHdr.Endianness, elfFs.DynSymbols[symNdx])
checkError(err)
symEntry := elfFs.DynSymbols[symNdx]
elfFs.DynSymbolsName[symEntry.(*elf.Sym32).Name] = getSymbolName(symEntry.(*elf.Sym32).Name, strtab)
}
}
case elf.ELFCLASS64:
var sym64 elf.Sym64
symSize := uint32(unsafe.Sizeof(sym64))
symtabSize := elfFs.ElfSections.Section.([]elf.Section64)[sectionNdx].Size
numSymbols := symtabSize / uint64(symSize)
off := elfFs.ElfSections.Section.([]elf.Section64)[sectionNdx].Off
/* strtab can be either .dynstr or .strtab depending on the symbol table*/
strtab := make([]byte, elfFs.ElfSections.Section.([]elf.Section64)[symstrNdx].Size)
strtabOff := elfFs.ElfSections.Section.([]elf.Section64)[symstrNdx].Off
strtabSize := elfFs.ElfSections.Section.([]elf.Section64)[symstrNdx].Size
n := int64(strtabOff + strtabSize)
shstrtabSec := io.NewSectionReader(elfFs.Fh, int64(strtabOff), n)
err := binary.Read(shstrtabSec, elfFs.FileHdr.Endianness, strtab)
checkError(err)
if symType == Sym {
elfFs.Symbols = make(map[uint32]interface{})
elfFs.SymbolsName = make(map[uint32]string)
n := int64(off + symtabSize)
sr := io.NewSectionReader(elfFs.Fh, int64(off), n)
for symNdx := uint32(0); uint64(symNdx) < numSymbols; symNdx++ {
elfFs.Symbols[symNdx] = new(elf.Sym64)
err := binary.Read(sr, elfFs.FileHdr.Endianness, elfFs.Symbols[symNdx])
checkError(err)
symEntry := elfFs.Symbols[symNdx]
elfFs.SymbolsName[symEntry.(*elf.Sym64).Name] = getSymbolName(symEntry.(*elf.Sym64).Name, strtab)
}
}
if symType == DynSym {
elfFs.DynSymbols = make(map[uint32]interface{})
elfFs.DynSymbolsName = make(map[uint32]string)
n := int64(off + symtabSize)
sr := io.NewSectionReader(elfFs.Fh, int64(off), n)
for symNdx := uint32(0); uint64(symNdx) < numSymbols; symNdx++ {
elfFs.DynSymbols[symNdx] = new(elf.Sym64)
err := binary.Read(sr, elfFs.FileHdr.Endianness, elfFs.DynSymbols[symNdx])
checkError(err)
symEntry := elfFs.DynSymbols[symNdx]
elfFs.DynSymbolsName[symEntry.(*elf.Sym64).Name] = getSymbolName(symEntry.(*elf.Sym64).Name, strtab)
}
}
}
}
func getSymbolName(symIndex uint32, sectionStrtab []byte) string {
return getSectionName(symIndex, sectionStrtab)
}
func getSectionNdx(name string, elfFs *ELFFile) uint32 {
var ndx uint32
for ndx = 0; ndx < uint32(len(elfFs.ElfSections.SectionName)); ndx++ {
if elfFs.ElfSections.SectionName[ndx] == name {
return ndx
}
}
return uint32(0)
}
func getSectionName(sIndex uint32, sectionShstrTab []byte) string {
end := sIndex
for end < uint32(len(sectionShstrTab)) {
if sectionShstrTab[end] == 0x0 {
break
}
end++
}
var name bytes.Buffer
name.Write(sectionShstrTab[sIndex:end])
return name.String()
}
func getSectionByType(t elf.SectionType, elfFs *ELFFile) []uint32 {
var indexList []uint32
if s, ok := elfFs.ElfSections.Section.([]elf.Section32); ok {
for sNdx := uint32(0); sNdx < uint32(len(s)); sNdx++ {
if t == elf.SectionType(s[sNdx].Type) {
indexList = append(indexList, sNdx)
}
}
}
if s, ok := elfFs.ElfSections.Section.([]elf.Section64); ok {
for sNdx := uint32(0); sNdx < uint32(len(s)); sNdx++ {
if t == elf.SectionType(s[sNdx].Type) {
indexList = append(indexList, sNdx)
}
}
}
return indexList
}
func (elfFs *ELFFile) getProgHeaders() {
fmt.Printf("%d program header entries\n", elfFs.Hdr.(*elf.Header64).Phnum)
fmt.Printf(" \t\t\t\t\tAddress\t\t\t\tSize\n")
fmt.Printf(" Num:\tType\tFlags\t\tOffset\tVirtual\t\tPhysical\tFile\tMemory\tAlign\n")
switch elfFs.FileHdr.Arch {
case elf.ELFCLASS32:
header, ok := elfFs.Hdr.(*elf.Header32)
if !ok {
return
}
buffer := make([]byte, header.Phnum*header.Phentsize)
_, err := elfFs.Fh.Seek(int64(header.Phoff), 0)
if err != nil {
fmt.Println(err)
return
}
_, err = io.ReadFull(elfFs.Fh, buffer)
if err != nil {
fmt.Println(err)
return
}
for i := 0; i < int(header.Phnum); i++ {
buf := bytes.NewBuffer(buffer[i*int(header.Phentsize) : (i+1)*int(header.Phentsize)])
entry := &elf.Prog32{}
err = binary.Read(buf, elfFs.FileHdr.Endianness, entry)
if err != nil {
fmt.Println(err)
return
}
flag := elf.ProgFlag(entry.Flags).String()
fmt.Printf(" %d\t%d\t%-16s0x%-4s\t0x%-8s\t0x%-8s\t%-4d\t%-4d\t%-4d\n", i, entry.Type, flag, fmt.Sprintf("%X", entry.Off), fmt.Sprintf("%X", entry.Vaddr), fmt.Sprintf("%X", entry.Paddr), entry.Filesz, entry.Memsz, entry.Align)
}
break
case elf.ELFCLASS64:
header, ok := elfFs.Hdr.(*elf.Header64)
if !ok {
return
}
buffer := make([]byte, header.Phnum*header.Phentsize)
_, err := elfFs.Fh.Seek(int64(header.Phoff), 0)
if err != nil {
fmt.Println(err)
return
}
_, err = io.ReadFull(elfFs.Fh, buffer)
if err != nil {
fmt.Println(err)
return
}
for i := 0; i < int(header.Phnum); i++ {
buf := bytes.NewBuffer(buffer[i*int(header.Phentsize) : (i+1)*int(header.Phentsize)])
entry := &elf.Prog64{}
err = binary.Read(buf, elfFs.FileHdr.Endianness, entry)
if err != nil {
fmt.Println(err)
return
}
flag := elf.ProgFlag(entry.Flags).String()
fmt.Printf(" %d\t%d\t%-16s0x%-4s\t0x%-8s\t0x%-8s\t%-4d\t%-4d\t%-4d\n", i, entry.Type, flag, fmt.Sprintf("%X", entry.Off), fmt.Sprintf("%X", entry.Vaddr), fmt.Sprintf("%X", entry.Paddr), entry.Filesz, entry.Memsz, entry.Align)
}
break
}
}
func (elfFs *ELFFile) getRelocations() {
elfFs.Rels = make(map[uint32]interface{})
if s, ok := elfFs.ElfSections.Section.([]elf.Section32); ok {
for sNdx := uint32(0); sNdx < uint32(len(s)); sNdx++ {
switch elf.SectionType(s[sNdx].Type) {
case elf.SHT_REL:
var rel elf.Rel32
sr := io.NewSectionReader(elfFs.Fh, int64(s[sNdx].Off), int64(s[sNdx].Size))
numRels := s[sNdx].Size / uint32(unsafe.Sizeof(rel))
elfFs.Rels[sNdx] = make([]elf.Rel32, numRels)
err := binary.Read(sr, elfFs.FileHdr.Endianness, elfFs.Rels[sNdx])
checkError(err)
case elf.SHT_RELA:
var rel elf.Rela32
sr := io.NewSectionReader(elfFs.Fh, int64(s[sNdx].Off), int64(s[sNdx].Size))
numRels := s[sNdx].Size / uint32(unsafe.Sizeof(rel))
elfFs.Rels[sNdx] = make([]elf.Rela32, numRels)
err := binary.Read(sr, elfFs.FileHdr.Endianness, elfFs.Rels[sNdx])
checkError(err)
}
}
}
if s, ok := elfFs.ElfSections.Section.([]elf.Section64); ok {
for sNdx := uint32(0); sNdx < uint32(len(s)); sNdx++ {
switch elf.SectionType(s[sNdx].Type) {
case elf.SHT_REL:
var rel elf.Rel64
n := int64(s[sNdx].Off) + int64(s[sNdx].Size)
sr := io.NewSectionReader(elfFs.Fh, int64(s[sNdx].Off), n)
numRels := s[sNdx].Size / uint64(unsafe.Sizeof(rel))
elfFs.Rels[sNdx] = make([]elf.Rel64, numRels)
err := binary.Read(sr, elfFs.FileHdr.Endianness, elfFs.Rels[sNdx])
checkError(err)
case elf.SHT_RELA:
var rel elf.Rela64
n := int64(s[sNdx].Off) + int64(s[sNdx].Size)
sr := io.NewSectionReader(elfFs.Fh, int64(s[sNdx].Off), n)
numRels := s[sNdx].Size / uint64(unsafe.Sizeof(rel))
elfFs.Rels[sNdx] = make([]elf.Rela64, numRels)
err := binary.Read(sr, elfFs.FileHdr.Endianness, elfFs.Rels[sNdx])
checkError(err)
}
}
}
}
func resolveRelocType(rType uint32, mType elf.Machine) string {
switch mType {
case elf.EM_X86_64:
return fmt.Sprintf("%s", elf.R_X86_64(rType))
case elf.EM_386:
return fmt.Sprintf("%s", elf.R_386(rType))
case elf.EM_ARM:
return fmt.Sprintf("%s", elf.R_ARM(rType))
case elf.EM_AARCH64:
return fmt.Sprintf("%s", elf.R_AARCH64(rType))
case elf.EM_PPC:
return fmt.Sprintf("%s", elf.R_PPC(rType))
case elf.EM_PPC64:
return fmt.Sprintf("%s", elf.R_PPC64(rType))
case elf.EM_MIPS:
return fmt.Sprintf("%s", elf.R_MIPS(rType))
case elf.EM_RISCV:
return fmt.Sprintf("%s", elf.R_RISCV(rType))
case elf.EM_S390:
return fmt.Sprintf("%s", elf.R_390(rType))
case elf.EM_SPARCV9:
return fmt.Sprintf("%s", elf.R_SPARC(rType))
default:
return "R_UNKNOWN"
}
}
func printRelocations(elfFs *ELFFile) {
if _, ok := elfFs.ElfSections.Section.([]elf.Section32); ok {
for k, v := range elfFs.Rels {
sName := elfFs.ElfSections.SectionName[k]
switch r := v.(type) {
case []elf.Rel32:
l := len(r)
fmt.Printf("\nSection %s has %d relocation entries\n\n", sName, l)
fmt.Println("Offset\t\t\tInfo\t\t\t\tType\t\t\tSym.Value\t\t\tSym.Name")
for rNdx := 0; rNdx < l; rNdx++ {
o := r[rNdx].Off
t := elf.R_TYPE32(r[rNdx].Info)
s := elf.R_SYM32(r[rNdx].Info)
i := elf.R_INFO(s, t)
relName := resolveRelocType(t, elfFs.FileHdr.Machine)
var symName string
var symValue uint32
var symbol interface{}
secNdx := elfFs.ElfSections.Section.([]elf.Section32)[k].Link
switch elfFs.ElfSections.SectionName[secNdx] {
case ".dynsym":
symbol = elfFs.DynSymbols[s]
symName = elfFs.DynSymbolsName[symbol.(*elf.Sym32).Name]
case ".symtab":
symbol = elfFs.Symbols[s]
symName = elfFs.SymbolsName[symbol.(*elf.Sym32).Name]
default:
fmt.Printf("f when locating symbol tables in printRelocations()")
os.Exit(1)
}
symValue = symbol.(*elf.Sym32).Value
fmt.Printf("%016x\t%016x\t%s\t%016x\t\t%s\n", o, i, relName, symValue, symName)
}
case []elf.Rela32:
l := len(r)
fmt.Printf("\nSection %s has %d relocation entries\n\n", sName, l)
for rNdx := 0; rNdx < l; rNdx++ {
o := r[rNdx].Off
a := r[rNdx].Addend
t := elf.R_TYPE32(r[rNdx].Info)
s := elf.R_SYM32(r[rNdx].Info)
i := elf.R_INFO(s, t)
relName := resolveRelocType(t, elfFs.FileHdr.Machine)
var symName string
var symValue uint32
var symbol interface{}
secNdx := elfFs.ElfSections.Section.([]elf.Section32)[k].Link
switch elfFs.ElfSections.SectionName[secNdx] {
case ".dynsym":
symbol = elfFs.DynSymbols[s]
symName = elfFs.DynSymbolsName[symbol.(*elf.Sym32).Name]
case ".symtab":
symbol = elfFs.Symbols[s]
symName = elfFs.SymbolsName[symbol.(*elf.Sym32).Name]
default:
fmt.Printf("f when locating symbol tables in printRelocations()")
os.Exit(1)
}
symValue = symbol.(*elf.Sym32).Value
if s != uint32(elf.SHN_UNDEF) {
symName += " + "
}
fmt.Printf("%016x\t%016x\t%s\t%016x\t\t%s%d\n", o, i, relName, symValue, symName, a)
}
}
}
}
if _, ok := elfFs.ElfSections.Section.([]elf.Section64); ok {
for k, v := range elfFs.Rels {
sName := elfFs.ElfSections.SectionName[k]
switch r := v.(type) {
case []elf.Rel64:
l := len(r)
fmt.Printf("\nSection %s has %d relocation entries\n\n", sName, l)
fmt.Println("Offset\t\t\tInfo\t\t\t\tType\t\t\tSym.Value\t\t\tSym.Name")
for rNdx := 0; rNdx < l; rNdx++ {
o := r[rNdx].Off
t := elf.R_TYPE64(r[rNdx].Info)
s := elf.R_SYM64(r[rNdx].Info)
i := elf.R_INFO(s, t)
relName := resolveRelocType(t, elfFs.FileHdr.Machine)
var symName string
var symValue uint64
var symbol interface{}
secNdx := elfFs.ElfSections.Section.([]elf.Section64)[k].Link
switch elfFs.ElfSections.SectionName[secNdx] {
case ".dynsym":
symbol = elfFs.DynSymbols[s]
symName = elfFs.DynSymbolsName[symbol.(*elf.Sym64).Name]
case ".symtab":
symbol = elfFs.Symbols[s]
symName = elfFs.SymbolsName[symbol.(*elf.Sym64).Name]
default:
fmt.Printf("f when locating symbol tables in printRelocations()")
os.Exit(1)
}
symValue = symbol.(*elf.Sym64).Value
fmt.Printf("%016x\t%016x\t%s\t%016x\t\t%s\n", o, i, relName, symValue, symName)
}
case []elf.Rela64:
l := len(r)
fmt.Printf("\nSection %s has %d relocation entries\n\n", sName, l)
fmt.Println("Offset\t\t\tInfo\t\t\t\tType\t\t\tSym.Value\t\t\tSym.Name + Addend")
for rNdx := 0; rNdx < l; rNdx++ {
o := r[rNdx].Off
a := r[rNdx].Addend
t := elf.R_TYPE64(r[rNdx].Info)
s := elf.R_SYM64(r[rNdx].Info)
i := elf.R_INFO(s, t)
relName := resolveRelocType(t, elfFs.FileHdr.Machine)
var symName string
var symValue uint64
var symbol interface{}
secNdx := elfFs.ElfSections.Section.([]elf.Section64)[k].Link
switch elfFs.ElfSections.SectionName[secNdx] {
case ".dynsym":
symbol = elfFs.DynSymbols[s]
symName = elfFs.DynSymbolsName[symbol.(*elf.Sym64).Name]
case ".symtab":
symbol = elfFs.Symbols[s]
symName = elfFs.SymbolsName[symbol.(*elf.Sym64).Name]
default:
fmt.Printf("Error when locating symbol tables in printRelocations()")
os.Exit(1)
}
symValue = symbol.(*elf.Sym64).Value
if s != uint32(elf.SHN_UNDEF) {
symName += " + "
}
fmt.Printf("%016x\t%016x\t%s\t%016x\t\t%s%d\n", o, i, relName, symValue, symName, a)
}
}
}
}
}
func printSymbols(elfFs *ELFFile) {
var symPresent, dsymPresent bool
var ndsym, nsym int
if ndsym = len(elfFs.DynSymbols); ndsym > 0 {
dsymPresent = true
}
if nsym = len(elfFs.Symbols); nsym > 0 {
symPresent = true
}
switch elfFs.FileHdr.Arch {
case elf.ELFCLASS32:
fmt.Printf(" Num:\tValue\t\tSize \tType\t\tBind\t\tVis\t\tNdx\t\tName\n")
if dsymPresent {
for sNdx := uint32(0); sNdx < uint32(ndsym); sNdx++ {
sym := elfFs.DynSymbols[sNdx]
v := sym.(*elf.Sym32).Value
s := sym.(*elf.Sym32).Size
t := elf.ST_TYPE(sym.(*elf.Sym32).Info)
b := elf.ST_BIND(sym.(*elf.Sym32).Info)
vis := elf.ST_VISIBILITY(sym.(*elf.Sym32).Info)
sec := sym.(*elf.Sym32).Shndx
nm := elfFs.DynSymbolsName[sym.(*elf.Sym32).Name]
if nm == "station/version.Version.str" {
fmt.Printf(" %-5d %08x\t%d\t%s\t%s\t%s\t%d\t%s\n", sNdx, v, s, t, b, vis, sec, nm)
break
}
//fmt.Printf(" %-5d %08x\t%d\t%s\t%s\t%s\t%d\t%s\n", sNdx, v, s, t, b, vis, sec, nm)
}
}
if symPresent {
for sNdx := uint32(0); sNdx < uint32(nsym); sNdx++ {
sym := elfFs.Symbols[sNdx]
v := sym.(*elf.Sym32).Value
s := sym.(*elf.Sym32).Size
t := elf.ST_TYPE(sym.(*elf.Sym32).Info)
b := elf.ST_BIND(sym.(*elf.Sym32).Info)
vis := elf.ST_VISIBILITY(sym.(*elf.Sym32).Info)
sec := sym.(*elf.Sym32).Shndx
nm := elfFs.SymbolsName[sym.(*elf.Sym32).Name]
fmt.Printf(" %-5d %08x\t%d\t%s\t%s\t%s\t%d\t%s\n", sNdx, v, s, t, b, vis, sec, nm)
}
}
case elf.ELFCLASS64:
fmt.Printf(" Num:\tValue\t\tSize \tType\t\tBind\t\tVis\t\tNdx\t\tName\n")
if dsymPresent {
for sNdx := uint32(0); sNdx < uint32(ndsym); sNdx++ {
sym := elfFs.DynSymbols[sNdx]
v := sym.(*elf.Sym64).Value
s := sym.(*elf.Sym64).Size
t := elf.ST_TYPE(sym.(*elf.Sym64).Info)
b := elf.ST_BIND(sym.(*elf.Sym64).Info)
vis := elf.ST_VISIBILITY(sym.(*elf.Sym64).Info)
sec := sym.(*elf.Sym64).Shndx
nm := elfFs.DynSymbolsName[sym.(*elf.Sym64).Name]
fmt.Printf(" %-5d %08x\t%d\t%s\t%s\t%s\t%d\t%s\n", sNdx, v, s, t, b, vis, sec, nm)
}
}
if symPresent {
for sNdx := uint32(0); sNdx < uint32(nsym); sNdx++ {
sym := elfFs.Symbols[sNdx]
v := sym.(*elf.Sym64).Value
s := sym.(*elf.Sym64).Size
t := elf.ST_TYPE(sym.(*elf.Sym64).Info)
b := elf.ST_BIND(sym.(*elf.Sym64).Info)
vis := elf.ST_VISIBILITY(sym.(*elf.Sym64).Info)
sec := sym.(*elf.Sym64).Shndx
nm := elfFs.SymbolsName[sym.(*elf.Sym64).Name]
fmt.Printf(" %-5d %08x\t%d\t%s\t%s\t%s\t%d\t%s\n", sNdx, v, s, t, b, vis, sec, nm)
}
}
}
}
func printSymbols_grep(elfFs *ELFFile, need string) GrepOut {
var symPresent, dsymPresent bool
var ndsym, nsym int
var out GrepOut
if ndsym = len(elfFs.DynSymbols); ndsym > 0 {
dsymPresent = true
}
if nsym = len(elfFs.Symbols); nsym > 0 {
symPresent = true
}
//fmt.Println("dsymPresent ", dsymPresent)
//fmt.Println("symPresent ", symPresent)
switch elfFs.FileHdr.Arch {
case elf.ELFCLASS32:
//fmt.Printf("32 Num:\tValue\t\tSize \tType\t\tBind\t\tVis\t\tNdx\t\tName\n")
if dsymPresent {
for sNdx := uint32(0); sNdx < uint32(ndsym); sNdx++ {
sym := elfFs.DynSymbols[sNdx]
v := sym.(*elf.Sym32).Value
s := sym.(*elf.Sym32).Size
//t := elf.ST_TYPE(sym.(*elf.Sym32).Info)
//b := elf.ST_BIND(sym.(*elf.Sym32).Info)
//vis := elf.ST_VISIBILITY(sym.(*elf.Sym32).Info)
//sec := sym.(*elf.Sym32).Shndx
nm := elfFs.DynSymbolsName[sym.(*elf.Sym32).Name]
if nm == need {
out.SNdx = sNdx
out.Name = nm
out.Value = int(v)
out.Size = int(s)
//fmt.Printf(" %-5d %08x\t%d\t%s\t%s\t%s\t%d\t%s\n", sNdx, v, s, t, b, vis, sec, nm)
return out
}
}
}
if symPresent {
for sNdx := uint32(0); sNdx < uint32(nsym); sNdx++ {
sym := elfFs.Symbols[sNdx]
v := sym.(*elf.Sym32).Value
s := sym.(*elf.Sym32).Size
//t := elf.ST_TYPE(sym.(*elf.Sym32).Info)
//b := elf.ST_BIND(sym.(*elf.Sym32).Info)
//vis := elf.ST_VISIBILITY(sym.(*elf.Sym32).Info)
//sec := sym.(*elf.Sym32).Shndx
nm := elfFs.SymbolsName[sym.(*elf.Sym32).Name]
if nm == need {
out.SNdx = sNdx
out.Name = nm
out.Value = int(v)
out.Size = int(s)
//fmt.Printf(" %-5d %08x\t%d\t%s\t%s\t%s\t%d\t%s\n", sNdx, v, s, t, b, vis, sec, nm)
return out
}
}
}
case elf.ELFCLASS64:
//fmt.Printf("64 Num:\tValue\t\tSize \tType\t\tBind\t\tVis\t\tNdx\t\tName\n")
if dsymPresent {
for sNdx := uint32(0); sNdx < uint32(ndsym); sNdx++ {
sym := elfFs.DynSymbols[sNdx]
v := sym.(*elf.Sym64).Value
s := sym.(*elf.Sym64).Size
//t := elf.ST_TYPE(sym.(*elf.Sym64).Info)
//b := elf.ST_BIND(sym.(*elf.Sym64).Info)
//vis := elf.ST_VISIBILITY(sym.(*elf.Sym64).Info)
//sec := sym.(*elf.Sym64).Shndx
nm := elfFs.DynSymbolsName[sym.(*elf.Sym64).Name]
if nm == need {
out.SNdx = sNdx
out.Name = nm
out.Value = int(v)
out.Size = int(s)
//fmt.Printf(" %-5d %08x\t%d\t%s\t%s\t%s\t%d\t%s\n", sNdx, v, s, t, b, vis, sec, nm)
return out
}
}
}
if symPresent {
for sNdx := uint32(0); sNdx < uint32(nsym); sNdx++ {
sym := elfFs.Symbols[sNdx]
v := sym.(*elf.Sym64).Value
s := sym.(*elf.Sym64).Size
//t := elf.ST_TYPE(sym.(*elf.Sym64).Info)
//b := elf.ST_BIND(sym.(*elf.Sym64).Info)
//vis := elf.ST_VISIBILITY(sym.(*elf.Sym64).Info)
//sec := sym.(*elf.Sym64).Shndx
nm := elfFs.SymbolsName[sym.(*elf.Sym64).Name]
if nm == need {
out.SNdx = sNdx
out.Name = nm
out.Value = int(v)
out.Size = int(s)
//fmt.Printf(" %-5d %08x\t%d\t%s\t%s\t%s\t%d\t%s\n", sNdx, v, s, t, b, vis, sec, nm)
return out
}
}
}
}
return out
}
func printSections(ElfSections SHDRTable, numSec uint16, secOff interface{}) {
switch v := secOff.(type) {
case uint32:
fmt.Printf("%d Sections @ Offset 0x%x\n", numSec, v)
case uint64:
fmt.Printf("%d Sections @ Offset 0x%x\n", numSec, v)
}
if section, ok := ElfSections.Section.([]elf.Section32); ok {
fmt.Println("[NR] Name\t\t\tType\t\tAddress\t\t\tOffsets")
fmt.Println(" Size\t\t\tEntSize\t\tFlags Link Info\t\tAlign")
for i := uint16(0); i < numSec; i++ {
a := section[i].Addr
o := section[i].Off
s := section[i].Size
e := section[i].Entsize
l := section[i].Link
f := flagToKey(fmt.Sprintf("%s", elf.SectionFlag(section[i].Flags)))
info := section[i].Info
align := section[i].Addralign
nm := ElfSections.SectionName[i]
/* SHT_REL string throws off alignment, this is a hack to maintain alignment for display purposes */
t := fmt.Sprintf("%s", elf.SectionType(section[i].Type))
if t == "SHT_REL" {
t += " "
}
fmt.Printf("[%-2d] %-20s\t%s\t%08x\t\t%08x\n", i, nm, t, a, o)
fmt.Printf(" %08x\t\t\t%08x\t %-5s%-5d%d\t\t%5d\n", s, e, f, l, info, align)
}
}
if section, ok := ElfSections.Section.([]elf.Section64); ok {
fmt.Println("[NR] Name\t\t\tType\t\tAddress\t\t\tOffsets")
fmt.Println(" Size\t\t\tEntSize\t\tFlags Link Info\t\tAlign")
for i := uint16(0); i < numSec; i++ {
t := elf.SectionType(section[i].Type)
a := section[i].Addr
o := section[i].Off
s := section[i].Size
e := section[i].Entsize
l := section[i].Link
f := flagToKey(fmt.Sprintf("%s", elf.SectionFlag(section[i].Flags)))
info := section[i].Info
align := section[i].Addralign
nm := ElfSections.SectionName[i]
fmt.Printf("[%-2d] %-20s\t%s\t%016x\t%08x\n", i, nm, t, a, o)
fmt.Printf(" %016x\t\t%016x %-5s%-5d%d\t\t%5d\n", s, e, f, l, info, align)
}
}
fmt.Println("Key to Flags:")
fmt.Println("W (write), A (alloc), X (executable), M (merge), S (strings), I (info)")
fmt.Println("L (link order), O (extra os processing required), G (group), T (TLS)")
fmt.Println("C (compressed), p (processor specific)")
}
func flagToKey(flag string) (key string) {
if strings.Contains(flag, "SHF_WRITE") {
key += "W"
}
if strings.Contains(flag, "SHF_ALLOC") {
key += "A"
}
if strings.Contains(flag, "SHF_EXECINSTR") {
key += "X"
}
if strings.Contains(flag, "SHF_MERGE") {
key += "M"
}
if strings.Contains(flag, "SHF_STRINGS") {
key += "S"
}
if strings.Contains(flag, "SHF_INFO_LINK") {
key += "I"
}
if strings.Contains(flag, "SHF_LINK_ORDER") {
key += "L"
}
if strings.Contains(flag, "SHF_OS_NONCONFORMING") {
key += "O"
}
if strings.Contains(flag, "SHF_GROUP") {
key += "G"
}
if strings.Contains(flag, "SHF_TLS") {
key += "T"
}
if strings.Contains(flag, "SHF_COMPRESSED") {
key += "C"
}
if strings.Contains(flag, "SHF_MASKOS") {
key += "o"
}
if strings.Contains(flag, "SHF_MASKPROC") {
key += "P"
}
return
}
func printHeader(hdr interface{}) {
if h, ok := hdr.(*elf.Header64); ok {
fmt.Printf("-------------------------- Elf Header ------------------------\n")
fmt.Printf("Magic: % x\n", h.Ident)
fmt.Printf("Class: %s\n", elf.Class(h.Ident[elf.EI_CLASS]))
fmt.Printf("Data: %s\n", elf.Data(h.Ident[elf.EI_DATA]))
fmt.Printf("Version: %s\n", elf.Version(h.Version))
fmt.Printf("OS/ABI: %s\n", elf.OSABI(h.Ident[elf.EI_OSABI]))
fmt.Printf("ABI Version: %d\n", h.Ident[elf.EI_ABIVERSION])
fmt.Printf("Elf Type: %s\n", elf.Type(h.Type))
fmt.Printf("Machine: %s\n", elf.Machine(h.Machine))
fmt.Printf("Entry: 0x%x\n", h.Entry)
fmt.Printf("Program Header Offset: 0x%x\n", h.Phoff)
fmt.Printf("Section Header Offset: 0x%x\n", h.Shoff)
fmt.Printf("Flags: 0x%x\n", h.Flags)
fmt.Printf("Elf Header Size (bytes): %d\n", h.Ehsize)
fmt.Printf("Program Header Entry Size (bytes): %d\n", h.Phentsize)
fmt.Printf("Number of Program Header Entries: %d\n", h.Phnum)
fmt.Printf("Size of Section Header Entry: %d\n", h.Shentsize)
fmt.Printf("Number of Section Header Entries: %d\n", h.Shnum)
fmt.Printf("Index of section header string table: %d\n", h.Shstrndx)
}
if h, ok := hdr.(*elf.Header32); ok {
fmt.Printf("-------------------------- Elf Header ------------------------\n")
fmt.Printf("Magic: % x\n", h.Ident)
fmt.Printf("Class: %s\n", elf.Class(h.Ident[elf.EI_CLASS]))
fmt.Printf("Data: %s\n", elf.Data(h.Ident[elf.EI_DATA]))
fmt.Printf("Version: %s\n", elf.Version(h.Version))
fmt.Printf("OS/ABI: %s\n", elf.OSABI(h.Ident[elf.EI_OSABI]))
fmt.Printf("ABI Version: %d\n", h.Ident[elf.EI_ABIVERSION])
fmt.Printf("Elf Type: %s\n", elf.Type(h.Type))
fmt.Printf("Machine: %s\n", elf.Machine(h.Machine))
fmt.Printf("Entry: 0x%x\n", h.Entry)
fmt.Printf("Program Header Offset: 0x%x\n", h.Phoff)
fmt.Printf("Section Header Offset: 0x%x\n", h.Shoff)
fmt.Printf("Flags: 0x%x\n", h.Flags)
fmt.Printf("Elf Header Size (bytes): %d\n", h.Ehsize)
fmt.Printf("Program Header Entry Size (bytes): %d\n", h.Phentsize)
fmt.Printf("Number of Program Header Entries: %d\n", h.Phnum)
fmt.Printf("Size of Section Header Entry: %d\n", h.Shentsize)
fmt.Printf("Number of Section Header Entries: %d\n", h.Shnum)
fmt.Printf("Index of section header string table: %d\n", h.Shstrndx)
}
return
}
func main_old() {
//fmt.Println("run tl")
if len(os.Args) < 3 {
usage()
os.Exit(1)
}
var target ELFFile
bin := os.Args[2]
target.Fh, target.err = os.Open(bin)
checkError(target.err)
defer target.Fh.Close()
target.Fh.Read(target.Ident[:16])
if isElf(target.Ident[:4]) == false {
fmt.Println("This is not an Elf binary")
os.Exit(1)
}
target.setArch()
target.mapHeader()
options := os.Args[1]
if options[0] != '-' {
usage()
os.Exit(1)
}
var optHeader, optSections, optSymbols, optRelocations, optProgHeaders bool
for i := 1; i < len(options); i++ {
switch {
case options[i] == 'h':
optHeader = true