package main import ( "encoding/json" "fmt" "io/ioutil" "log" "net" "os" "strconv" "strings" "github.com/miekg/dns" ) var localresponderConfigName string type stringarray []string type urlsMap map[string]stringarray func init() { localresponderConfigName = "__localresponder__" var MyConfRaw interface{} file, err := ioutil.ReadFile("config.json") if err != nil { log.Println("Cannot open config file", err.Error()) os.Exit(1) } err = json.Unmarshal([]byte(file), &MyConfRaw) if err != nil { log.Println("Cannot unmarshal json: ", err.Error()) os.Exit(1) } // now we read configuration file fmt.Println("Reading configuration file...") MyConf := MyConfRaw.(map[string]interface{}) //****************************** // zabov section (global config) //****************************** zabov := MyConf["zabov"].(map[string]interface{}) ZabovPort := zabov["port"].(string) ZabovType := zabov["proto"].(string) ZabovAddr := zabov["ipaddr"].(string) ZabovCacheTTL = int(zabov["cachettl"].(float64)) ZabovKillTTL = int(zabov["killfilettl"].(float64)) if zabov["debug"] != nil { ZabovDebug = zabov["debug"].(string) == "true" } if zabov["debugdbpath"] != nil { ZabovDebugDBPath = (zabov["debugdbpath"].(string)) } if MyConf["configs"] == nil { log.Println("configs not set: you shall set at least 'default' config") os.Exit(1) } configs := MyConf["configs"].(map[string]interface{}) if len(configs) == 0 { log.Println("you shall set at least 'default' config") os.Exit(1) } if configs["default"] == nil { log.Println("'default' config is required") os.Exit(1) } zabovString := ZabovAddr + ":" + ZabovPort MyDNS = new(dns.Server) MyDNS.Addr = zabovString MyDNS.Net = ZabovType ZabovConfigs = map[string]*ZabovConfig{} ZabovIPGroups = []ZabovIPGroup{} ZabovTimetables = map[string]*ZabovTimetable{} ZabovIPAliases = map[string]string{} //******************* // IP aliases section //******************* if MyConf["ipaliases"] != nil { IPAliasesRaw := MyConf["ipaliases"].(map[string]interface{}) for alias, ip := range IPAliasesRaw { fmt.Println("IP Alias:", alias, ip) ZabovIPAliases[alias] = ip.(string) } } //**************** // configs section //**************** for name, v := range configs { fmt.Println("evaluaing config name:", name) confRaw := v.(map[string]interface{}) var conf ZabovConfig conf.ZabovUpDNS = confRaw["upstream"].(string) conf.ZabovSingleBL = confRaw["singlefilters"].(string) conf.ZabovDoubleBL = confRaw["doublefilters"].(string) conf.ZabovAddBL = confRaw["blackholeip"].(string) conf.ZabovHostsFile = confRaw["hostsfile"].(string) conf.ZabovDNSArray = fileByLines(conf.ZabovUpDNS) ZabovConfigs[name] = &conf } // default config is mandatory ZabovConfigs["default"].references++ //******************* // timetables section //******************* if MyConf["timetables"] != nil { timetables := MyConf["timetables"].(map[string]interface{}) for name, v := range timetables { fmt.Println("evaluaing timetable name:", name) timetableRaw := v.(map[string]interface{}) var timetable ZabovTimetable timetable.cfgin = timetableRaw["cfgin"].(string) timetable.cfgout = timetableRaw["cfgout"].(string) if timetable.cfgin == "" { timetable.cfgin = "default" } if timetable.cfgout == "" { timetable.cfgout = "default" } refConfig, ok := ZabovConfigs[timetable.cfgin] if !ok { log.Println("timetable: inexistent cfgin:", timetable.cfgin) os.Exit(1) } refConfig.references++ refConfig, ok = ZabovConfigs[timetable.cfgout] if !ok { log.Println("timetable: inexistent cfgout:", timetable.cfgout) os.Exit(1) } refConfig.references++ tables := timetableRaw["tables"].([]interface{}) for i := range tables { table := tables[i].(map[string]interface{}) var ttEntry ZabovTimetableEntry ttEntry.times = []*ZabovTimeRange{} for _, tRaw := range strings.Split(table["times"].(string), ";") { tRawArr := strings.Split(tRaw, "-") if len(tRawArr) > 1 { startArr := strings.Split(tRawArr[0], ":") stopArr := strings.Split(tRawArr[1], ":") if len(startArr) > 1 && len(stopArr) > 1 { hourStart, _ := strconv.Atoi(startArr[0]) minuteStart, _ := strconv.Atoi(startArr[1]) start := ZabovTime{hour: hourStart, minute: minuteStart} hourStop, _ := strconv.Atoi(stopArr[0]) minuteStop, _ := strconv.Atoi(stopArr[1]) stop := ZabovTime{hour: hourStop, minute: minuteStop} t := ZabovTimeRange{start: start, stop: stop} ttEntry.times = append(ttEntry.times, &t) } } } ttEntry.days = map[string]bool{} for _, day := range strings.Split(table["days"].(string), ";") { ttEntry.days[day] = true } timetable.table = append(timetable.table, &ttEntry) } ZabovTimetables[name] = &timetable } } //****************** // IP groups section //****************** if MyConf["ipgroups"] != nil { IPGroups := MyConf["ipgroups"].([]interface{}) fmt.Println("evaluating IP Groups: ", len(IPGroups)) for i := range IPGroups { fmt.Println("evaluating IP Group n.", i) var groupStruct ZabovIPGroup groupMap := IPGroups[i].(map[string]interface{}) IPsRaw := groupMap["ips"].([]interface{}) groupStruct.ips = []net.IP{} for x := range IPsRaw { ipRaw := IPsRaw[x].(string) ip := net.ParseIP(ipRaw) fmt.Println("adding IP ", ipRaw) alias, ok := ZabovIPAliases[ipRaw] if ok { fmt.Println("IP alias: ", ipRaw, alias) ip = net.ParseIP(alias) } groupStruct.ips = append(groupStruct.ips, ip) } groupStruct.cfg = groupMap["cfg"].(string) groupStruct.timetable = groupMap["timetable"].(string) if len(groupStruct.cfg) > 0 { refConfig, ok := ZabovConfigs[groupStruct.cfg] if !ok { log.Println("ipgroups: inexistent cfg:", groupStruct.cfg) os.Exit(1) } else { refConfig.references++ } } fmt.Println("cfg:", groupStruct.cfg) fmt.Println("timetable:", groupStruct.timetable) _, ok := ZabovTimetables[groupStruct.timetable] if !ok { log.Println("inexistent timetable:", groupStruct.timetable) os.Exit(1) } ZabovIPGroups = append(ZabovIPGroups, groupStruct) } } if zabov["timetable"] != nil { ZabovDefaultTimetable = zabov["timetable"].(string) _, ok := ZabovTimetables[ZabovDefaultTimetable] if !ok { log.Println("inexistent timetable:", ZabovDefaultTimetable) os.Exit(1) } } //************************ // Local responder section //************************ if MyConf["localresponder"] != nil { localresponder := MyConf["localresponder"].(map[string]interface{}) if localresponder != nil { if localresponder["responder"] != nil { ZabovLocalResponder = localresponder["responder"].(string) if len(ZabovLocalResponder) > 0 { local := ZabovConfig{ZabovDNSArray: []string{ZabovLocalResponder}, references: 1} ZabovConfigs[localresponderConfigName] = &local fmt.Println("ZabovLocalResponder:", ZabovLocalResponder) } } if localresponder["localdomain"] != nil { ZabovLocalDomain = localresponder["localdomain"].(string) } } } //****************************************** // clearing unused configs to save resources //****************************************** for name, conf := range ZabovConfigs { if conf.references == 0 { log.Println("WARNING: disabling unused configuration:", name) delete(ZabovConfigs, name) } else { ZabovCreateKDB(name) } } }