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ldso.go
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ldso.go
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// ldso.go - Dynamic linker routines.
// Copyright 2016 Yawning Angel
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
package dynlib
import (
"debug/elf"
"errors"
"fmt"
"os"
"path/filepath"
"runtime"
)
var errUnsupported = errors.New("dynlib: unsupported os/architecture")
func getLibraries(fn string) ([]string, error) {
f, err := elf.Open(fn)
if err != nil {
return nil, err
}
defer f.Close()
return f.ImportedLibraries()
}
// ValidateLibraryClass ensures that the library matches the current
// architecture.
func ValidateLibraryClass(fn string) error {
f, err := elf.Open(fn)
if err != nil {
return err
}
defer f.Close()
var expectedClass elf.Class
switch runtime.GOARCH {
case archAmd64:
expectedClass = elf.ELFCLASS64
default:
return errUnsupported
}
if f.Class != expectedClass {
return fmt.Errorf("unsupported class: %v: %v", fn, f.Class)
}
return nil
}
// FindLdSo returns the path to the `ld.so` dynamic linker for the current
// architecture, which is usually a symlink
func FindLdSo(cache *Cache) (string, string, error) {
if !IsSupported() {
return "", "", errUnsupported
}
name := ""
searchPaths := []string{}
switch runtime.GOARCH {
case archAmd64:
searchPaths = append(searchPaths, "/lib64")
name = "ld-linux-x86-64.so.2"
default:
panic("dynlib: unsupported architecture: " + runtime.GOARCH)
}
searchPaths = append(searchPaths, "/lib")
for _, d := range searchPaths {
candidate := filepath.Join(d, name)
_, err := os.Stat(candidate)
if err != nil {
continue
}
actual := cache.GetLibraryPath(name)
if actual == "" {
continue
}
actual, err = filepath.EvalSymlinks(actual)
return actual, candidate, err
}
return "", "", os.ErrNotExist
}
// IsSupported returns true if the architecture/os combination has dynlib
// support.
func IsSupported() bool {
return runtime.GOOS == "linux" && runtime.GOARCH == archAmd64
}