offsetter

offsetter

Small package to convert between file offsets and virtual addresses (partialy inspired by some code of pwnlib). For the moment, only ELF files are supported.

Install

Install with go get -u github.com/guitmz/offsetter

Example

$ cat example.go

package main

import (
   "debug/elf"
   "fmt"

   "github.com/guitmz/offsetter"
)

func check(err error) {
   if err != nil {
   	panic(err)
   }
}

func main() {
   targetFile, err := elf.Open("/bin/ls")
   check(err)
   defer targetFile.Close()

   loadAddress, err := offsetter.GetLoadAddress(targetFile)
   check(err)

   hexOffset, uintOffset, err := offsetter.VaddrToOffset(targetFile, loadAddress, targetFile.Entry)
   check(err)
   fmt.Printf("Offset: %s (%d)\n", hexOffset, uintOffset)

   hexVaddr, uintVaddr, err := offsetter.OffsetToVaddr(targetFile, uintOffset)
   check(err)
   fmt.Printf("Vaddr: %s (%d)\n", hexVaddr, uintVaddr)
}

$ go run example.go
Offset: 0x42d4 (17108)
Vaddr: 0x4042d4 (4211412)