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restart.go
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restart.go
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package slinkwatch
// This file is part of slinkwatch.
//
// slinkwatch is free software; you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// slinkwatch 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 slinkwatch; if not, write to the Free Software Foundation,
// Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
import (
"fmt"
"os/exec"
"github.com/coreos/go-systemd/dbus"
"github.com/coreos/go-systemd/util"
log "github.com/sirupsen/logrus"
)
// RestartManager encapsulates interaction with the init system to restart the
// Suricata process on request.
type RestartManager struct {
IsSystemd bool
RestartCommand string
ServiceName string
}
// MakeRestartManager returns a new RestartManager with restart command and
// service name preconfigured.
func MakeRestartManager(restartCommand string, serviceName string) (*RestartManager, error) {
r := &RestartManager{
IsSystemd: util.IsRunningSystemd(),
RestartCommand: restartCommand,
ServiceName: serviceName,
}
if !r.IsSystemd {
log.Infoln("Not running systemd, will rely on restart command")
} else {
log.Infoln("systemd is available")
}
if !r.IsSystemd && len(restartCommand) == 0 {
return nil, fmt.Errorf("Not running systemd but no restart command given")
}
return r, nil
}
// RestartSuricata triggers a Suricata restart, using the most appropriate
// method.
func (rm *RestartManager) RestartSuricata() error {
if !rm.IsSystemd {
cmd := exec.Command("sh", "-c", rm.RestartCommand)
err := cmd.Run()
if err != nil {
return fmt.Errorf("Cannot restart Suricata: %v", err)
}
return nil
}
conn, err := dbus.New()
if err != nil {
return err
}
finishChan := make(chan string)
_, err = conn.TryRestartUnit(rm.ServiceName, "replace", finishChan)
if err != nil {
return err
}
go func(ch chan string) {
log.Infof("restart result: %s", <-ch)
}(finishChan)
return nil
}