77 lines
1.4 KiB
Go
77 lines
1.4 KiB
Go
//go:build linux
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// +build linux
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package aghos
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import (
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"bytes"
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"os"
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"path/filepath"
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"strings"
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"syscall"
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"golang.org/x/sys/unix"
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)
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func canBindPrivilegedPorts() (can bool, err error) {
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cnbs, err := unix.PrctlRetInt(unix.PR_CAP_AMBIENT, unix.PR_CAP_AMBIENT_IS_SET, unix.CAP_NET_BIND_SERVICE, 0, 0)
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// Don't check the error because it's always nil on Linux.
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adm, _ := haveAdminRights()
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return cnbs == 1 || adm, err
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}
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func setRlimit(val uint64) (err error) {
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var rlim syscall.Rlimit
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rlim.Max = val
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rlim.Cur = val
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return syscall.Setrlimit(syscall.RLIMIT_NOFILE, &rlim)
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}
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func haveAdminRights() (bool, error) {
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// The error is nil because the platform-independent function signature
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// requires returning an error.
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return os.Getuid() == 0, nil
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}
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func sendProcessSignal(pid int, sig syscall.Signal) error {
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return syscall.Kill(pid, sig)
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}
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func isOpenWrt() (ok bool) {
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const etcDir = "/etc"
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dirEnts, err := os.ReadDir(etcDir)
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if err != nil {
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return false
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}
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// fNameSubstr is a part of a name of the desired file.
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const fNameSubstr = "release"
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osNameData := []byte("OpenWrt")
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for _, dirEnt := range dirEnts {
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if dirEnt.IsDir() {
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continue
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}
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fn := dirEnt.Name()
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if !strings.Contains(fn, fNameSubstr) {
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continue
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}
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var body []byte
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body, err = os.ReadFile(filepath.Join(etcDir, fn))
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if err != nil {
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continue
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}
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if bytes.Contains(body, osNameData) {
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return true
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}
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}
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return false
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}
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