Tiny replacement for piHole DNS filter
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7.8 KiB

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 = net.ParseIP(confRaw["blackholeip"].(string))
conf.ZabovHostsFile = confRaw["hostsfile"].(string)
if confRaw["cache"] != nil {
conf.ZabovCache = confRaw["cache"].(bool)
} else {
conf.ZabovCache = true
}
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)
}
if groupMap["cfg"] != nil {
groupStruct.cfg = groupMap["cfg"].(string)
}
if groupMap["timetable"] != nil {
groupStruct.timetable = groupMap["timetable"].(string)
}
if len(groupStruct.cfg) == 0 && len(groupStruct.timetable) == 0 {
log.Println("ip group error: specify cfg or timetable")
os.Exit(1)
}
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)
}
if len(groupStruct.timetable) > 0 {
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)
}
}
}