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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2018 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 strace
import (
"fmt"
"os/exec"
"os/user"
"path/filepath"
"runtime"
"gitee.com/mysnapcore/mysnapd/dirs"
"gitee.com/mysnapcore/mysnapd/osutil"
)
// These syscalls are excluded because they make strace hang on all or
// some architectures (gettimeofday on arm64).
// Furthermore not all syscalls exist on all arches, and for some
// arches strace has a mapping for some of the non-existent
// syscalls. Thus there is no universal list of syscalls to exclude.
func getExcludedSyscalls() string {
switch runtime.GOARCH {
case "arm", "arm64", "riscv64":
return "!pselect6,_newselect,clock_gettime,sigaltstack,gettid,gettimeofday,nanosleep"
default:
return "!select,pselect6,_newselect,clock_gettime,sigaltstack,gettid,gettimeofday,nanosleep"
}
}
// Export excluded syscalls as used by this package and multiple
// testsuites
var ExcludedSyscalls = getExcludedSyscalls()
// Command returns how to run strace in the users context with the
// right set of excluded system calls.
func Command(extraStraceOpts []string, traceeCmd ...string) (*exec.Cmd, error) {
current, err := user.Current()
if err != nil {
return nil, err
}
sudoPath, err := exec.LookPath("sudo")
if err != nil {
return nil, fmt.Errorf("cannot use strace without sudo: %s", err)
}
// Try strace from the snap first, we use new syscalls like
// "_newselect" that are known to not work with the strace of e.g.
// ubuntu 14.04.
//
// TODO: some architectures do not have some syscalls (e.g.
// s390x does not have _newselect). In
// https://github.com/strace/strace/issues/57 options are
// discussed. We could use "-e trace=?syscall" but that is
// only available since strace 4.17 which is not even in
// ubutnu 17.10.
var stracePath string
cand := filepath.Join(dirs.SnapMountDir, "strace-static", "current", "bin", "strace")
if osutil.FileExists(cand) {
stracePath = cand
}
if stracePath == "" {
stracePath, err = exec.LookPath("strace")
if err != nil {
return nil, fmt.Errorf("cannot find an installed strace, please try 'snap install strace-static'")
}
}
args := []string{
sudoPath,
"-E",
stracePath,
"-u", current.Username,
"-f",
"-e", ExcludedSyscalls,
}
args = append(args, extraStraceOpts...)
args = append(args, traceeCmd...)
return &exec.Cmd{
Path: sudoPath,
Args: args,
}, nil
}
// TraceExecCommand returns an exec.Cmd suitable for tracking timings of
// execve{,at}() calls
func TraceExecCommand(straceLogPath string, origCmd ...string) (*exec.Cmd, error) {
extraStraceOpts := []string{"-ttt", "-e", "trace=execve,execveat", "-o", fmt.Sprintf("%s", straceLogPath)}
return Command(extraStraceOpts, origCmd...)
}
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