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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2019 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package main
import (
"crypto/sha256"
"fmt"
"os"
"strings"
"github.com/seccomp/libseccomp-golang"
"github.com/snapcore/snapd/cmd/snap-seccomp/syscalls"
"github.com/snapcore/snapd/osutil"
)
var seccompSyscalls = syscalls.SeccompSyscalls
func versionInfo() (string, error) {
myBuildID, err := osutil.MyBuildID()
if err != nil {
return "", fmt.Errorf("cannot get build-id of snap-seccomp: %v", err)
}
// Calculate the checksum of all syscall names supported by libseccomp
// library. We add that to the version info to cover the case when
// libseccomp version does not change, but the set of supported syscalls
// does due to distro patches.
sh := sha256.New()
newline := []byte("\n")
for _, syscallName := range seccompSyscalls {
if _, err := seccomp.GetSyscallFromName(syscallName); err != nil {
// syscall is unsupported by this version of libseccomp
continue
}
sh.Write([]byte(syscallName))
sh.Write(newline)
}
major, minor, micro := seccomp.GetLibraryVersion()
features := goSeccompFeatures()
return fmt.Sprintf("%s %d.%d.%d %x %s", myBuildID, major, minor, micro, sh.Sum(nil), features), nil
}
func showVersionInfo() error {
vi, err := versionInfo()
if err != nil {
return err
}
fmt.Fprintln(os.Stdout, vi)
return nil
}
func goSeccompFeatures() string {
var features []string
if actLogSupported() {
features = append(features, "bpf-actlog")
}
if len(features) == 0 {
return "-"
}
return strings.Join(features, ":")
}
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