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package ldd
import (
"bytes"
"context"
"io"
"os"
"os/exec"
"time"
"git.gensokyo.uk/security/fortify/internal/sandbox"
)
const lddTimeout = 2 * time.Second
var (
msgStatic = []byte("Not a valid dynamic program")
msgStaticGlibc = []byte("not a dynamic executable")
)
func Exec(ctx context.Context, p string) ([]*Entry, error) { return ExecFilter(ctx, nil, nil, p) }
func ExecFilter(ctx context.Context,
commandContext func(context.Context) *exec.Cmd,
f func([]byte) []byte,
p string) ([]*Entry, error) {
c, cancel := context.WithTimeout(ctx, lddTimeout)
defer cancel()
container := sandbox.New(c, "ldd", p)
container.CommandContext = commandContext
container.Hostname = "fortify-ldd"
stdout, stderr := new(bytes.Buffer), new(bytes.Buffer)
container.Stdout = stdout
container.Stderr = stderr
container.Bind("/", "/", 0).Proc("/proc").Dev("/dev")
if err := container.Start(); err != nil {
return nil, err
}
defer func() { _, _ = io.Copy(os.Stderr, stderr) }()
if err := container.Serve(); err != nil {
return nil, err
}
if err := container.Wait(); err != nil {
m := stderr.Bytes()
if bytes.Contains(m, append([]byte(p+": "), msgStatic...)) ||
bytes.Contains(m, msgStaticGlibc) {
return nil, nil
}
return nil, err
}
v := stdout.Bytes()
if f != nil {
v = f(v)
}
return Parse(v)
}
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