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main.go
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main.go
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/*
pkgsonames is a utility that lists sonames in Archlinux packages (tarballs).
*/
package main
import (
"archive/tar"
"bytes"
"compress/gzip"
"debug/elf"
"encoding/binary"
"flag"
"fmt"
"io"
"os"
"path/filepath"
"strings"
xz "github.com/remyoudompheng/go-liblzma"
)
type ReadCloser struct {
io.Reader
closers []io.Closer
}
func (x *ReadCloser) Close() error {
for _, c := range x.closers {
c.Close()
}
return nil
}
func OpenPackage(name string) (x ReadCloser, err error) {
f, err := os.Open(name)
if err != nil {
return x, err
}
var rd io.ReadCloser
switch filepath.Ext(name) {
case ".xz":
rd, err = xz.NewReader(f)
case ".gz":
rd, err = gzip.NewReader(f)
default:
return x, fmt.Errorf("not a package name: %s", name)
}
if err != nil {
f.Close()
return x, err
}
return ReadCloser{rd, []io.Closer{rd, f}}, nil
}
func WalkELF(tarfile io.ReadCloser, do func(filename string, data []byte)) error {
t := tar.NewReader(tarfile)
defer tarfile.Close()
buf := new(bytes.Buffer)
for {
entry, err := t.Next()
if err == io.EOF {
return nil
}
if err != nil {
return err
}
switch entry.Typeflag {
case tar.TypeReg, tar.TypeRegA:
// OK.
default:
continue
}
buf.Reset()
n, err := io.CopyN(buf, t, 4)
switch {
case n < 4 || err != nil:
continue
case string(buf.Bytes()) != elf.ELFMAG:
continue
}
io.Copy(buf, t)
do(entry.Name, buf.Bytes())
}
}
func getstring(table []byte, offset int) string {
n := bytes.IndexByte(table[offset:], 0)
return string(table[offset : offset+n])
}
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 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
}
type StringList []string
func (s *StringList) Set(arg string) error { *s = strings.Split(arg, ","); return nil }
func (s *StringList) String() string { return strings.Join(*s, ",") }
func errorf(format string, args ...interface{}) {
fmt.Fprintf(os.Stderr, format+"\n", args...)
}
func main() {
var repopath string
var deps bool
archs := StringList{"i686", "x86_64"}
flag.StringVar(&repopath, "repo", "", "path to repository")
flag.Var(&archs, "arch", "path to repository")
flag.BoolVar(&deps, "deps", false, "print dependencies instead of sonames")
flag.Parse()
if repopath != "" {
// Use repository at specified path.
err := os.Chdir(repopath)
if err != nil {
errorf("%s", err)
}
var packages []string
for _, arch := range archs {
p, err := filepath.Glob("*/os/" + arch + "/*.pkg.tar.[gx]z")
if err != nil {
errorf("%s", err)
}
packages = append(packages, p...)
}
errorf("%d packages to process", len(packages))
for _, pkgfile := range packages {
elems := strings.Split(filepath.ToSlash(filepath.Clean(pkgfile)), "/")
if len(elems) != 4 {
errorf("invalid package path: %s", pkgfile)
continue
}
repo, arch, name := elems[0], elems[2], elems[3]
t, err := OpenPackage(pkgfile)
if err != nil {
errorf("%s", err)
continue
}
printed := false
WalkELF(&t, func(fname string, data []byte) {
if soname, ok := Soname(data); ok {
if !printed {
printed = true
errorf(pkgfile)
}
fmt.Println(strings.Join([]string{
repo, arch, name, fname, soname}, ","))
}
})
}
} else {
// Process packages from command line.
for _, tarname := range flag.Args() {
t, err := OpenPackage(tarname)
if err != nil {
errorf("%s", err)
continue
}
WalkELF(&t, func(fname string, data []byte) {
if !deps {
soname, ok := Soname(data)
if ok {
fmt.Printf("%s,%s,%s\n", tarname, fname, soname)
}
} else {
depends, err := Depends(data)
if err != nil {
errorf("corrupted ELF file %q: %s", fname, err)
}
for _, s := range depends {
fmt.Printf("%s,%s,%s\n", tarname, fname, s)
}
}
})
}
}
}