/
bango.go
216 lines (178 loc) · 4.81 KB
/
bango.go
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//
// Michael Pirogov © 2024 <vbnet.ru@gmail.com>
//
package main
import (
"log"
"github.com/redis/go-redis/v9"
"runtime"
"os"
"context"
"strings"
"os/exec"
"github.com/Unknwon/goconfig"
"net"
)
var client *redis.Client
func init() {
LoadBangoConfig("/etc/bango.ini")
}
func main() {
action, payload := ParseFlags()
runtime.GOMAXPROCS(4)
CreateConnection()
switch action {
case "publish":
BangoPublish("fail2ban", payload)
default:
BangoSubscribe()
}
}
func CreateConnection() {
var serverstring = ""
serverstring = config.redis.server+":"+config.redis.port
client = redis.NewClient(&redis.Options{
Addr: serverstring,
Password: config.redis.pass,
DB: int(config.redis.db),})
pong, err := client.Ping(context.Background()).Result()
if err == nil {
log.Println("Connected succesfully and got", pong, "from redis://" + serverstring)
} else {
panic(err.Error())
}
}
func BangoSubscribe() {
pubsub := client.Subscribe(context.Background(), "fail2ban")
defer pubsub.Close()
var unbanprefix = "unban"
for {
msg, err := pubsub.ReceiveMessage(context.Background())
_ = err
if err != nil {
log.Println("Subscription failed")
}
log.Println("Received:", msg.Channel, msg.Payload)
if strings.HasPrefix(msg.Payload, unbanprefix) {
UnBanIP(strings.TrimPrefix(msg.Payload,unbanprefix))
} else {
BanIP(msg.Payload)
}
}
}
func BanIP(ip string) {
if CheckIP(ip) {
ExecCommand("fail2ban-client", "set", config.fail2ban.jail, "banip", ip)
}
}
func UnBanIP(ip string) {
if CheckIP(ip) {
ExecCommand("fail2ban-client", "set", config.fail2ban.jail, "unbanip", ip)
}
}
func BangoPublish(channel, payload string) {
log.Println("Starting publish in 'fail2ban' channel")
pub := client.Publish(context.Background(), channel, payload)
if pub.Err() == nil {
log.Printf("Successfully published '%s'", payload)
}
}
//
// CONFIG
//
const (
version = "0.0.4"
)
// Packaged all Server settings
type Config struct {
redis Redis
global Global
fail2ban Fail2ban
}
type Redis struct {
server string
port string
db int
pass string
}
type Global struct {
debug bool
logFile string
}
type Fail2ban struct {
channel string
jail string
useF2C bool
}
// Define a global config varible
var config Config
func LoadBangoConfig(fileName string) {
var err error
_, err = os.Stat(fileName)
if err != nil {
if os.IsNotExist(err) {
panic("Configuration file does not exists: " + err.Error())
} else {
panic("Something wrong with configuration file: " + err.Error())
}
}
var cfg *goconfig.ConfigFile
cfg, err = goconfig.LoadConfigFile(fileName)
if err != nil {
panic("Fail to load configuration file: " + err.Error())
}
// Parse the global section
config.global.debug = cfg.MustBool("global", "debug", false)
// Parse the redis section
config.redis.server = cfg.MustValue("redis", "server", "localhost")
config.redis.port = cfg.MustValue("redis", "port", "6379")
config.redis.db = cfg.MustInt("redis", "db", 0)
config.redis.pass = cfg.MustValue("redis", "pass", "")
// Parse the fail2ban section
config.fail2ban.channel = cfg.MustValue("fail2ban", "channel", "fail2ban")
config.fail2ban.jail = cfg.MustValue("fail2ban", "jail", "fail2ban-recidive")
config.fail2ban.useF2C = cfg.MustBool("fail2ban", "usef2bclient", true)
}
//
// UTILS
//
func CheckIP(checkip string) bool {
trial := net.ParseIP(checkip)
if trial.To4() == nil {
log.Printf("ERROR: '%v' is not an IPv4 address. Doing nothing.\n", checkip)
return false
} else {
return true
}
}
func ExecCommand(command string, args ...string) {
binary, lookErr := exec.LookPath(command)
if lookErr != nil {
panic(lookErr)
}
log.Println("Launching:", command, args)
// actually call
cmd := exec.Command(binary, args...)
err := cmd.Start()
if err != nil {
log.Fatal(err)
}
log.Println("Waiting for command to finish...")
err = cmd.Wait()
if err != nil {
log.Printf("Command finished with error: %v", err)
}
log.Printf("done")
}
func ParseFlags() (string, string) {
var action, payload string = "", ""
if len(os.Args) > 2 {
// action: subscribe, publish
// default: subscribe
action = os.Args[1]
// subaction and ip address to ban
// default: ""
payload = os.Args[2]
}
return action, payload
}