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// Copyright 2017 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package pprof
import (
"encoding/binary"
"errors"
"fmt"
"os"
)
var (
errBadELF = errors.New("malformed ELF binary")
errNoBuildID = errors.New("no NT_GNU_BUILD_ID found in ELF binary")
)
// elfBuildID returns the GNU build ID of the named ELF binary,
// without introducing a dependency on debug/elf and its dependencies.
func elfBuildID(file string) (string, error) {
buf := make([]byte, 256)
f, err := os.Open(file)
if err != nil {
return "", err
}
defer f.Close()
if _, err := f.ReadAt(buf[:64], 0); err != nil {
return "", err
}
// ELF file begins with \x7F E L F.
if buf[0] != 0x7F || buf[1] != 'E' || buf[2] != 'L' || buf[3] != 'F' {
return "", errBadELF
}
var byteOrder binary.ByteOrder
switch buf[5] {
default:
return "", errBadELF
case 1: // little-endian
byteOrder = binary.LittleEndian
case 2: // big-endian
byteOrder = binary.BigEndian
}
var shnum int
var shoff, shentsize int64
switch buf[4] {
default:
return "", errBadELF
case 1: // 32-bit file header
shoff = int64(byteOrder.Uint32(buf[32:]))
shentsize = int64(byteOrder.Uint16(buf[46:]))
if shentsize != 40 {
return "", errBadELF
}
shnum = int(byteOrder.Uint16(buf[48:]))
case 2: // 64-bit file header
shoff = int64(byteOrder.Uint64(buf[40:]))
shentsize = int64(byteOrder.Uint16(buf[58:]))
if shentsize != 64 {
return "", errBadELF
}
shnum = int(byteOrder.Uint16(buf[60:]))
}
for i := 0; i < shnum; i++ {
if _, err := f.ReadAt(buf[:shentsize], shoff+int64(i)*shentsize); err != nil {
return "", err
}
if typ := byteOrder.Uint32(buf[4:]); typ != 7 { // SHT_NOTE
continue
}
var off, size int64
if shentsize == 40 {
// 32-bit section header
off = int64(byteOrder.Uint32(buf[16:]))
size = int64(byteOrder.Uint32(buf[20:]))
} else {
// 64-bit section header
off = int64(byteOrder.Uint64(buf[24:]))
size = int64(byteOrder.Uint64(buf[32:]))
}
size += off
for off < size {
if _, err := f.ReadAt(buf[:16], off); err != nil { // room for header + name GNU\x00
return "", err
}
nameSize := int(byteOrder.Uint32(buf[0:]))
descSize := int(byteOrder.Uint32(buf[4:]))
noteType := int(byteOrder.Uint32(buf[8:]))
descOff := off + int64(12+(nameSize+3)&^3)
off = descOff + int64((descSize+3)&^3)
if nameSize != 4 || noteType != 3 || buf[12] != 'G' || buf[13] != 'N' || buf[14] != 'U' || buf[15] != '\x00' { // want name GNU\x00 type 3 (NT_GNU_BUILD_ID)
continue
}
if descSize > len(buf) {
return "", errBadELF
}
if _, err := f.ReadAt(buf[:descSize], descOff); err != nil {
return "", err
}
return fmt.Sprintf("%x", buf[:descSize]), nil
}
}
return "", errNoBuildID
}