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tasks.go
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tasks.go
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// Copyright (c) 2018, Kirill Ovchinnikov
// All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
// 1. Redistributions of source code must retain the above copyright notice, this
// list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
// ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
package main
import (
"bytes"
"fmt"
"net"
"os/exec"
"strings"
"syscall"
)
type IpAddrType int64
const (
IPv4 IpAddrType = 0
IPv6 = 1
)
type task struct {
Name string `json:"name"`
TurnOn string `json:"on_command"`
TurnOff string `json:"off_command"`
TurnOnIpV6 string `json:"on_command_v6"`
TurnOffIpV6 string `json:"off_command_v6"`
Timeout uint16 `json:"timeout"`
}
type taskResult struct {
Command string `json:"commandLine"`
Retcode int `json:"returnCode"`
Err string `json:"error,omitempty"`
StdErr string `json:"stderr,omitempty"`
StdOut string `json:"stdout,omitempty"`
Timeout uint16 `json:"timeoutInSeconds,omitempty"`
Ip net.IP `json:"clientIp"`
}
func prepareIp(ip net.IP) (net.IP, IpAddrType) {
// let's perform conversion first to check if we have IPv4 or IPv6
// and second to extract IPv4 from something like "::FFFF:192.168.0.1"
ipv4 := ip.To4()
if ipv4 == nil {
return ip, IPv6
} else {
return ip.To4(), IPv4
}
}
func generateCommand(ip net.IP, ServerIp net.IP, cmd string) string {
s := strings.Replace(cmd, "{clientIP}", ip.String(), -1)
s = strings.Replace(s, "{serverIP}", ServerIp.String(), -1)
return s
}
func resultCommandMissing(ip net.IP) taskResult {
var result taskResult
result.Retcode = -1
result.Ip = ip
result.Err = "No command declared in config for the client's type of IP address"
return result
}
func runCmd(cmd string) taskResult {
var outbuf, errbuf bytes.Buffer
var result taskResult
result.Command = cmd
args := strings.Fields(cmd)
command := exec.Command(args[0], args[1:]...)
command.Stdout = &outbuf
command.Stderr = &errbuf
err := command.Run()
result.StdErr = errbuf.String()
result.StdOut = outbuf.String()
if err != nil {
result.Retcode = -1
result.Err = err.Error()
}
if exitError, ok := err.(*exec.ExitError); ok {
result.Retcode = exitError.Sys().(syscall.WaitStatus).ExitStatus()
}
return result
}
func (c task) Start(env *state, ip net.IP) *taskResult {
ip, ipType := prepareIp(ip)
var cmd string
if ipType == IPv4 {
if c.TurnOn == "" {
result := resultCommandMissing(ip)
return &result
}
if c.Timeout != 0 && c.TurnOff == "" {
result := resultCommandMissing(ip)
return &result
}
cmd = generateCommand(ip, env.config.ServerIp, c.TurnOn)
} else {
if c.TurnOnIpV6 == "" {
result := resultCommandMissing(ip)
return &result
}
if c.Timeout != 0 && c.TurnOffIpV6 == "" {
result := resultCommandMissing(ip)
return &result
}
cmd = generateCommand(ip, env.config.ServerIpv6, c.TurnOnIpV6)
}
result := runCmd(cmd)
result.Timeout = c.Timeout
result.Ip = ip
env.log.Info(fmt.Sprintf("Task start result: %#v", result))
if result.Retcode == 0 && c.Timeout != 0 {
if ipType == IPv4 {
cmd = generateCommand(ip, env.config.ServerIp, c.TurnOff)
} else {
cmd = generateCommand(ip, env.config.ServerIpv6, c.TurnOffIpV6)
}
env.monitor.ScheduleTaskToStop(cmd, c.Timeout)
}
return &result
}
func (c task) Stop(env *state, ip net.IP) *taskResult {
ip, ipType := prepareIp(ip)
var cmd string
if ipType == IPv4 {
if c.TurnOff == "" {
result := resultCommandMissing(ip)
return &result
}
cmd = generateCommand(ip, env.config.ServerIp, c.TurnOff)
} else {
if c.TurnOffIpV6 == "" {
result := resultCommandMissing(ip)
return &result
}
cmd = generateCommand(ip, env.config.ServerIpv6, c.TurnOffIpV6)
}
result := runCmd(cmd)
result.Ip = ip
env.log.Info(fmt.Sprintf("Task stop result: %#v", result))
if result.Retcode == 0 {
env.monitor.CancelTask(cmd)
}
return &result
}