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package ldd
import (
"bytes"
"context"
"errors"
"io"
"os"
"os/exec"
"time"
"hakurei.app/container"
"hakurei.app/container/check"
"hakurei.app/container/fhs"
"hakurei.app/container/seccomp"
"hakurei.app/container/std"
"hakurei.app/message"
)
const (
// msgStaticSuffix is the suffix of message printed to stderr by musl on a statically linked program.
msgStaticSuffix = ": Not a valid dynamic program"
// msgStaticGlibc is a substring of the message printed to stderr by glibc on a statically linked program.
msgStaticGlibc = "not a dynamic executable"
)
// Exec runs ldd(1) in a restrictive [container] and connects it to a [Decoder], returning resulting entries.
func Exec(ctx context.Context, msg message.Msg, p string) ([]*Entry, error) {
const (
lddName = "ldd"
lddTimeout = 4 * time.Second
)
c, cancel := context.WithTimeout(ctx, lddTimeout)
defer cancel()
var toolPath *check.Absolute
if s, err := exec.LookPath(lddName); err != nil {
return nil, err
} else if toolPath, err = check.NewAbs(s); err != nil {
return nil, err
}
z := container.NewCommand(c, msg, toolPath, lddName, p)
z.Hostname = "hakurei-" + lddName
z.SeccompFlags |= seccomp.AllowMultiarch
z.SeccompPresets |= std.PresetStrict
stderr := new(bytes.Buffer)
z.Stderr = stderr
z.
Bind(fhs.AbsRoot, fhs.AbsRoot, 0).
Proc(fhs.AbsProc).
Dev(fhs.AbsDev, false)
var d *Decoder
if r, err := z.StdoutPipe(); err != nil {
return nil, err
} else {
d = NewDecoder(r)
}
if err := z.Start(); err != nil {
return nil, err
}
defer func() { _, _ = io.Copy(os.Stderr, stderr) }()
if err := z.Serve(); err != nil {
return nil, err
}
entries, decodeErr := d.Decode()
if err := z.Wait(); err != nil {
m := stderr.Bytes()
if bytes.Contains(m, []byte(msgStaticSuffix)) || bytes.Contains(m, []byte(msgStaticGlibc)) {
return nil, nil
}
if decodeErr != nil {
return nil, errors.Join(decodeErr, err)
}
return nil, err
}
return entries, decodeErr
}
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