| 1 | // SPDX-License-Identifier: GPL-3.0-or-later |
| 2 | |
| 3 | //go:build linux |
| 4 | |
| 5 | package fail2ban |
| 6 | |
| 7 | import ( |
| 8 | "errors" |
| 9 | "os" |
| 10 | "strings" |
| 11 | "time" |
| 12 | |
| 13 | "github.com/netdata/netdata/go/plugins/logger" |
| 14 | "github.com/netdata/netdata/go/plugins/plugin/go.d/pkg/ndexec" |
| 15 | ) |
| 16 | |
| 17 | var errJailNotExist = errors.New("jail not exist") |
| 18 | |
| 19 | const socketPathInDocker = "/host/var/run/fail2ban/fail2ban.sock" |
| 20 | |
| 21 | type fail2banClientCli interface { |
| 22 | status() ([]byte, error) |
| 23 | jailStatus(s string) ([]byte, error) |
| 24 | } |
| 25 | |
| 26 | func newFail2BanClientCliExec(timeout time.Duration, log *logger.Logger) *fail2banClientCliExec { |
| 27 | _, err := os.Stat("/host/var/run") |
| 28 | |
| 29 | return &fail2banClientCliExec{ |
| 30 | Logger: log, |
| 31 | timeout: timeout, |
| 32 | isInsideDocker: err == nil, |
| 33 | } |
| 34 | } |
| 35 | |
| 36 | type fail2banClientCliExec struct { |
| 37 | *logger.Logger |
| 38 | |
| 39 | timeout time.Duration |
| 40 | isInsideDocker bool |
| 41 | } |
| 42 | |
| 43 | func (e *fail2banClientCliExec) status() ([]byte, error) { |
| 44 | if e.isInsideDocker { |
| 45 | return e.execute("fail2ban-client-status-socket", |
| 46 | "--socket_path", socketPathInDocker, |
| 47 | ) |
| 48 | } |
| 49 | return e.execute("fail2ban-client-status") |
| 50 | } |
| 51 | |
| 52 | func (e *fail2banClientCliExec) jailStatus(jail string) ([]byte, error) { |
| 53 | if e.isInsideDocker { |
| 54 | return e.execute("fail2ban-client-status-jail-socket", |
| 55 | "--jail", jail, |
| 56 | "--socket_path", socketPathInDocker, |
| 57 | ) |
| 58 | } |
| 59 | return e.execute("fail2ban-client-status-jail", |
| 60 | "--jail", jail, |
| 61 | ) |
| 62 | } |
| 63 | |
| 64 | func (e *fail2banClientCliExec) execute(cmd string, args ...string) ([]byte, error) { |
| 65 | bs, err := ndexec.RunNDSudo(e.Logger, e.timeout, cmd, args...) |
| 66 | if err != nil { |
| 67 | if strings.HasPrefix(strings.TrimSpace(string(bs)), "Sorry but the jail") { |
| 68 | return nil, errJailNotExist |
| 69 | } |
| 70 | return nil, err |
| 71 | } |
| 72 | return bs, err |
| 73 | } |