first commit

.gitignore

@@ -0,0 +1,10 @@
+zabov
+killfile
+killfile/*
+db/zabov.db
+binaries
+binaries/*
+build.sh
+.vscode
+.vscode/*
+

00.database.go

@@ -0,0 +1,38 @@
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/syndtr/goleveldb/leveldb"
+)
+
+//MyZabovKDB is the storage where we'll put domains to block
+var MyZabovKDB *leveldb.DB
+
+//MyZabovCDB is the storage where we'll put domains to cache
+var MyZabovCDB *leveldb.DB
+
+func init() {
+
+	var err error
+
+	os.RemoveAll("./db")
+
+	os.MkdirAll("./db", 0755)
+
+	MyZabovKDB, err = leveldb.OpenFile("./db/killfile", nil)
+	if err != nil {
+		fmt.Println("Cannot create Killfile db: ", err.Error())
+	} else {
+		fmt.Println("Killfile DB created")
+	}
+
+	MyZabovCDB, err = leveldb.OpenFile("./db/cache", nil)
+	if err != nil {
+		fmt.Println("Cannot create Cache db: ", err.Error())
+	} else {
+		fmt.Println("Cache DB created")
+	}
+
+}

00.memory.go

@@ -0,0 +1,26 @@
+package main
+
+import (
+	"fmt"
+	"runtime"
+	"time"
+)
+
+func init() {
+
+	fmt.Println("Garbage Collector Thread Starting")
+
+	go memoryCleanerThread()
+
+}
+
+func memoryCleanerThread() {
+
+	for {
+		time.Sleep(10 * time.Minute)
+		fmt.Println("Time to clean memory...")
+		runtime.GC()
+		fmt.Println("Garbage Collection done.")
+	}
+
+}

01.conf.go

@@ -0,0 +1,69 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"log"
+	"os"
+
+	"github.com/miekg/dns"
+)
+
+func init() {
+
+	//ZabovConf describes the Json we use for configuration
+	type ZabovConf struct {
+		Zabov struct {
+			Port          string `json:"port"`
+			Proto         string `json:"proto"`
+			Ipaddr        string `json:"ipaddr"`
+			Upstream      string `json:"upstream"`
+			Cachettl      int    `json:"cachettl"`
+			Killfilettl   int    `json:"killfilettl"`
+			Singlefilters string `json:"singlefilters"`
+			Doublefilters string `json:"doublefilters"`
+			Blackholeip   string `json:"blackholeip"`
+			Hostsfile     string `json:"hostsfile"`
+		} `json:"zabov"`
+	}
+
+	var MyConf ZabovConf
+
+	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), &MyConf)
+
+	if err != nil {
+		log.Println("Cannot marshal json: ", err.Error())
+		os.Exit(1)
+	}
+
+	// now we read configuration file
+	fmt.Println("Reading configuration file...")
+
+	ZabovPort := MyConf.Zabov.Port
+	ZabovType := MyConf.Zabov.Proto
+	ZabovAddr := MyConf.Zabov.Ipaddr
+	ZabovUpDNS = MyConf.Zabov.Upstream
+	ZabovSingleBL = MyConf.Zabov.Singlefilters
+	ZabovDoubleBL = MyConf.Zabov.Doublefilters
+	ZabovAddBL = MyConf.Zabov.Blackholeip
+	ZabovCacheTTL = MyConf.Zabov.Cachettl
+	ZabovKillTTL = MyConf.Zabov.Killfilettl
+	ZabovHostsFile = MyConf.Zabov.Hostsfile
+
+	zabovString := ZabovAddr + ":" + ZabovPort
+
+	MyDNS = new(dns.Server)
+	MyDNS.Addr = zabovString
+	MyDNS.Net = ZabovType
+
+	ZabovDNSArray = fileByLines(ZabovUpDNS)
+
+}

01.dnscheck.go

@@ -0,0 +1,37 @@
+package main
+
+import (
+	"fmt"
+	"net/http"
+	"time"
+)
+
+//NetworkUp tells the system if the network is up or not
+var NetworkUp bool
+
+func checkNetworkUp() bool {
+	// RFC2606 test domain, should always work, unless internet is down.
+	_, err := http.Get("http://example.com")
+	if err != nil {
+		return false
+	}
+	return true
+}
+
+func checkNetworkUpThread() {
+
+	ticker := time.NewTicker(2 * time.Minute)
+
+	for range ticker.C {
+		NetworkUp = checkNetworkUp()
+	}
+
+}
+
+func init() {
+
+	fmt.Println("Network Checker starting....")
+
+	go checkNetworkUpThread()
+
+}

01.killfile.go

@@ -0,0 +1,79 @@
+package main
+
+import (
+	"fmt"
+	"strings"
+)
+
+var zabovKbucket = []byte("killfile")
+
+type killfileItem struct {
+	Kdomain string
+	Ksource string
+}
+
+var bChannel chan killfileItem
+
+func init() {
+
+	bChannel = make(chan killfileItem, 1024)
+	fmt.Println("Initializing kill channel engine.")
+
+	go bWriteThread()
+
+}
+
+func bWriteThread() {
+
+	for item := range bChannel {
+
+		writeInKillfile(item.Kdomain, item.Ksource)
+		incrementStats("BL domains from "+item.Ksource, 1)
+		incrementStats("TOTAL", 1)
+
+	}
+
+}
+
+//DomainKill stores a domain name inside the killfile
+func DomainKill(s, durl string) {
+
+	if len(s) > 2 {
+
+		s = strings.ToLower(s)
+
+		var k killfileItem
+
+		k.Kdomain = s
+		k.Ksource = durl
+
+		bChannel <- k
+
+	}
+
+}
+
+func writeInKillfile(key, value string) {
+
+	stK := []byte(key)
+	stV := []byte(value)
+
+	err := MyZabovKDB.Put(stK, stV, nil)
+	if err != nil {
+		fmt.Println("Cannot write to Killfile DB: ", err.Error())
+	}
+
+}
+
+func domainInKillfile(domain string) bool {
+
+	s := strings.ToLower(domain)
+
+	has, err := MyZabovKDB.Has([]byte(s), nil)
+	if err != nil {
+		fmt.Println("Cannot read from Killfile DB: ", err.Error())
+	}
+
+	return has
+
+}

01.stats.go

@@ -0,0 +1,100 @@
+package main
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"time"
+)
+
+type send struct {
+	Payload   string
+	Number    int64
+	Operation string
+}
+
+//ZabovStats is used to keep statistics to print
+var ZabovStats map[string]int64
+
+var stats chan send
+
+func init() {
+
+	stats = make(chan send, 1024)
+
+	ZabovStats = make(map[string]int64)
+
+	fmt.Println("Initializing stats engine.")
+	go reportPrintThread()
+	go statsThread()
+}
+
+func statsPrint() {
+	fmt.Println()
+	stat, _ := json.Marshal(ZabovStats)
+	fmt.Println(jsonPrettyPrint(string(stat)))
+	fmt.Println()
+}
+
+func incrementStats(key string, value int64) {
+
+	var s send
+
+	s.Payload = key
+	s.Number = value
+	s.Operation = "INC"
+
+	stats <- s
+
+}
+
+func setstatsvalue(key string, value int64) {
+
+	var s send
+
+	s.Payload = key
+	s.Number = value
+	s.Operation = "SET"
+
+	stats <- s
+
+}
+
+func reportPrintThread() {
+	for {
+		var s send
+		s.Operation = "PRI"
+		s.Payload = "-"
+		s.Number = 0
+		stats <- s
+		time.Sleep(2 * time.Minute)
+	}
+}
+
+func statsThread() {
+
+	fmt.Println("Starting Statistical Collection Thread")
+
+	for item := range stats {
+
+		switch item.Operation {
+		case "INC":
+			ZabovStats[item.Payload] += item.Number
+		case "SET":
+			ZabovStats[item.Payload] = item.Number
+		case "PRI":
+			statsPrint()
+		}
+
+	}
+
+}
+
+func jsonPrettyPrint(in string) string {
+	var out bytes.Buffer
+	err := json.Indent(&out, []byte(in), "", "\t")
+	if err != nil {
+		return in
+	}
+	return out.String()
+}

02.cache.go

@@ -0,0 +1,104 @@
+package main
+
+import (
+	"bytes"
+	"encoding/gob"
+	"fmt"
+	"time"
+
+	"github.com/miekg/dns"
+)
+
+
+
+type cacheItem struct {
+	Query []byte
+	Date  time.Time
+}
+
+//DomainCache stores a domain name inside the cache
+func DomainCache(s string, resp *dns.Msg) {
+
+	var domain2cache cacheItem
+	var err error
+	var dom2 bytes.Buffer
+	enc := gob.NewEncoder(&dom2)
+
+	domain2cache.Query, err = resp.Pack()
+	if err != nil {
+		fmt.Println("Problems packing the response: ", err.Error())
+	}
+	domain2cache.Date = time.Now()
+
+	err = enc.Encode(domain2cache)
+
+	if err != nil {
+		fmt.Println("Cannot GOB the domain to cache: ", err.Error())
+	}
+
+	cacheDomain(s, dom2.Bytes())
+
+}
+
+func cacheDomain(key string, domain []byte) {
+
+	err := MyZabovCDB.Put([]byte(key), domain, nil)
+	if err != nil {
+		fmt.Println("Cannot write to Cache DB: ", err.Error())
+	}
+
+}
+
+//GetDomainFromCache stores a domain name inside the cache
+func GetDomainFromCache(s string) *dns.Msg {
+
+	ret := new(dns.Msg)
+	var cache bytes.Buffer
+	dec := gob.NewDecoder(&cache)
+	var record cacheItem
+	var conf []byte
+	var errDB error
+
+	if domainInCache(s) == false {
+		return nil
+	}
+
+	conf, errDB = MyZabovCDB.Get([]byte(s), nil)
+	if errDB != nil {
+		fmt.Println("Cant READ DB :" , errDB.Error() )
+		return nil
+	}
+
+	cache.Write(conf)
+
+	err := dec.Decode(&record)
+	if err != nil {
+		fmt.Println("Decode error :", err.Error())
+		return nil
+	}
+
+	if time.Since(record.Date) > (time.Duration(ZabovCacheTTL) * time.Hour) {
+		return nil
+	}
+
+	err = ret.Unpack(record.Query)
+	if err != nil {
+		fmt.Println("Problem unpacking response: ", err.Error())
+		return nil
+	}
+
+	return ret
+
+}
+
+func domainInCache(domain string) bool {
+
+	has, err := MyZabovCDB.Has([]byte(domain), nil)
+	if err != nil {
+		fmt.Println("Cannot search Cache DB: ", err.Error())
+		return false
+	}
+
+	return has
+
+}

Dockerfile.amd64

@@ -0,0 +1,18 @@
+FROM golang:1.14.1 AS builder
+RUN apt install git -y
+RUN mkdir -p /go/src/zabov
+RUN git clone https://git.keinpfusch.net/loweel/zabov /go/src/zabov 
+WORKDIR /go/src/zabov
+ENV GO111MODULE=auto 
+RUN go get ; go build -mod=vendor 
+
+FROM debian:latest 
+RUN apt update
+RUN apt upgrade -y
+RUN apt install ca-certificates -y
+RUN mkdir -p /opt/zabov
+WORKDIR  /opt/zabov
+COPY --from=builder /go/src/zabov /opt/zabov 
+EXPOSE 53/udp
+ENTRYPOINT ["/opt/zabov/zabov"]
+

Dockerfile.arm32v7

@@ -0,0 +1,17 @@
+FROM arm32v7/golang:1.14.1 AS builder
+RUN apt install git -y
+RUN mkdir -p /go/src/zabov
+RUN git clone https://git.keinpfusch.net/loweel/zabov /go/src/zabov 
+WORKDIR /go/src/zabov
+ENV GO111MODULE=auto 
+RUN go get ; go build -mod=vendor 
+
+FROM arm32v7/debian:latest 
+RUN apt update
+RUN apt upgrade -y
+RUN apt install ca-certificates -y
+RUN mkdir -p /opt/zabov
+WORKDIR  /opt/zabov
+COPY --from=builder /go/src/zabov /opt/zabov 
+EXPOSE 53/udp
+ENTRYPOINT ["/opt/zabov/zabov"]

Dockerfile.arm64v8

@@ -0,0 +1,17 @@
+FROM arm64v8/golang:1.14.1 AS builder
+RUN apt install git -y
+RUN mkdir -p /go/src/zabov
+RUN git clone https://git.keinpfusch.net/loweel/zabov /go/src/zabov 
+WORKDIR /go/src/zabov
+ENV GO111MODULE=auto 
+RUN go get ; go build -mod=vendor 
+
+FROM arm64v8/debian:latest 
+RUN apt update
+RUN apt upgrade -y
+RUN apt install ca-certificates -y
+RUN mkdir -p /opt/zabov
+WORKDIR  /opt/zabov
+COPY --from=builder /go/src/zabov /opt/zabov 
+EXPOSE 53/udp
+ENTRYPOINT ["/opt/zabov/zabov"]

LICENSE

@@ -0,0 +1,14 @@
+    Copyright (C) 2020  loweel@keinpfusch.net
+
+    This program 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 3 of the License, or
+    (at your option) any later version.
+
+    This program 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 this program.  If not, see <https://www.gnu.org/licenses/>.

README.md

@@ -0,0 +1,91 @@
+# zabov
+
+Tiny replacement for piHole DNS filter
+
+Still Work in progress, usable.
+
+Idea is to produce a very simple, no-web-interface , IP DNS blocker.
+
+# INSTALL
+
+Zabov requires golang 1.13 or later.
+
+<pre>
+git clone https://git.keinpfusch.net/Loweel/zabov.git
+cd zabov
+go get
+go build -mod=vendor
+</pre>
+
+Then, edit config.json: please notice config.json must be in the same folder of the executable you run.
+
+
+Just a few words about "singlefilters" and "doublefilters":
+
+Data must be downloaded from URLs of blacklist mantainers.They may come in different formats.
+
+There are two kinds of blacklists:
+
+One is the format zabov calls "singlefilter", where we find a single column , full of domains:
+
+<pre>
+domain1.com
+domain2.com
+domain3.com
+</pre>
+
+The second is the format zabov calls "doublefilter" (a file in "/etc/hosts" format, to be precise), where there is an IP, usually localhost or 0.0.0.0 and then the domain:
+
+<pre>
+127.0.0.1 domain1.com
+127.0.0.1 domain2.com
+127.0.0.1 domain3.com
+</pre>
+
+This is why configuration file has two separated items.
+
+The config file should look like:
+
+<pre>
+{
+    "zabov": {  
+        "port":"53", 
+        "proto":"udp", 
+        "ipaddr":"127.0.0.1",
+        "upstream":"./dns-upstream.txt",
+        "cachettl": "4",
+        "killfilettl": "12",
+        "singlefilters":"./urls-hosts.txt" ,
+        "doublefilters":"./urls-domains.txt", 
+        "blackholeip":"127.0.0.1",
+        "hostsfile":"./urls-local.txt"
+    }
+
+}
+
+
+
+</pre>
+
+Where:
+
+- port is the port number. Usually is 53, you can change for docker, if you like
+- proto is the protocol. Choices are "udp", "tcp", "tcp/udp"
+- ipaddr is the port to listen to. Maybe empty, (which will result in listening to 0.0.0.0) to avoid issues with docker.
+- upstream: file containing all DNS we want to query :  each line in format IP:PORT
+- cachettl: amount of time the cache is kept (in hours)
+- killfilettl: refresh time for _killfiles_
+- singlefilters: name of the file  for blacklists following the "singlefilter" schema.(one URL per line)
+- doublefilters: name of the file, for blacklists following the "doublefilter" schema.(one URL per line)
+- blackholeip: IP address to return when the IP is banned. This is because you may want to avoid MX issues, mail loops on localhost, or you have a web server running on localhost
+- hostsfile: path where you keep your local blacklistfile : this is in the format "singlefilter", meaning one domain per line, unlike hosts file.
+
+# DOCKER
+Multistage Dockerfiles are provided for AMD64, ARMv7, ARM64V8
+
+# TODO:
+
+- ~~caching~~
+- monitoring port
+
+

adlist_hosts.go

@@ -0,0 +1,96 @@
+package main
+
+import (
+	"bufio"
+	"errors"
+	"fmt"
+	"net"
+	"net/http"
+
+	"strings"
+	"time"
+)
+
+func init() {
+	go downloadDoubleThread()
+}
+
+//DoubleIndexFilter puts the domains inside file
+func DoubleIndexFilter(durl string) error {
+
+	fmt.Println("Retrieving HostFile from: ", durl)
+
+	var err error
+
+	// Get the data
+	resp, err := http.Get(durl)
+	if err != nil {
+		fmt.Println("HTTP problem: ", err)
+		return err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode == 200 { // OK
+		fmt.Println(durl + " Response: OK")
+	} else {
+		fmt.Println("Server <"+durl+"> returned status code: ", resp.StatusCode)
+		return errors.New("Server <" + durl + "> returned status code: " + resp.Status)
+	}
+
+	scanner := bufio.NewScanner(resp.Body)
+	splitter := func(c rune) bool {
+		return c == ' ' || c == '\t'
+	}
+
+	var numLines int64
+
+	for scanner.Scan() {
+
+		line := scanner.Text()
+
+		h := strings.FieldsFunc(line, splitter)
+
+		if h == nil {
+			continue
+		}
+
+		if len(h) < 2 {
+			continue
+		}
+
+		if net.ParseIP(h[0]) != nil {
+			DomainKill(h[1], durl)
+
+			// fmt.Println("MATCH: ", h[1])
+			numLines++
+		} else {
+			incrementStats("Malformed HostLines "+durl, 1)
+			// fmt.Println("Malformed line: <" + line + ">")
+		}
+
+	}
+
+	fmt.Println("Finished to parse: "+durl+" ,number of lines", numLines)
+
+	return err
+
+}
+
+func getDoubleFilters() {
+
+	s := fileByLines(ZabovDoubleBL)
+
+	for _, a := range s {
+		DoubleIndexFilter(a)
+	}
+
+}
+
+func downloadDoubleThread() {
+	fmt.Println("Starting updater of DOUBLE lists, each (hours):", ZabovKillTTL)
+	for {
+		getDoubleFilters()
+		time.Sleep(time.Duration(ZabovKillTTL) * time.Hour)
+	}
+
+}

adlist_single.go

@@ -0,0 +1,93 @@
+package main
+
+import (
+	"bufio"
+	"errors"
+	"fmt"
+	"net/http"
+	"strings"
+	"time"
+)
+
+func init() {
+	go downloadThread()
+}
+
+//SingleIndexFilter puts the domains inside file
+func SingleIndexFilter(durl string) error {
+
+	fmt.Println("Retrieving DomainFile from: ", durl)
+
+	var err error
+
+	// Get the data
+	resp, err := http.Get(durl)
+	if err != nil {
+		fmt.Println("HTTP Problem: ", err)
+		return err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode == 200 { // OK
+		fmt.Println(durl + " Response: OK")
+	} else {
+		fmt.Println("Server <"+durl+"> returned status code: ", resp.StatusCode)
+		return errors.New("Server <" + durl + "> returned status code: " + resp.Status)
+	}
+
+	scanner := bufio.NewScanner(resp.Body)
+	splitter := func(c rune) bool {
+		return c == ' ' || c == '\t'
+	}
+
+	var numLines int64
+
+	for scanner.Scan() {
+
+		line := scanner.Text()
+
+		h := strings.FieldsFunc(line, splitter)
+
+		if h == nil {
+			continue
+		}
+
+		if len(h) < 1 {
+			continue
+		}
+
+		if !strings.Contains(h[0], "#") {
+			DomainKill(h[0], durl)
+			// fmt.Println("MATCH: ", h[1])
+			numLines++
+		} else {
+			incrementStats("Malformed DomainLines "+durl, 1)
+			// fmt.Println("Malformed line: <" + line + ">")
+		}
+
+	}
+
+	fmt.Println("Finished to parse: "+durl+" ,number of lines", numLines)
+
+	return err
+
+}
+
+func getSingleFilters() {
+
+	s := fileByLines(ZabovSingleBL)
+
+	for _, a := range s {
+		SingleIndexFilter(a)
+	}
+
+}
+
+func downloadThread() {
+	fmt.Println("Starting updater of SINGLE lists, each (hours): ", ZabovKillTTL)
+	for {
+		getSingleFilters()
+		time.Sleep(time.Duration(ZabovKillTTL) * time.Hour)
+	}
+
+}

config.json

@@ -0,0 +1,15 @@
+{
+    "zabov": {  
+        "port":"53", 
+        "proto":"udp", 
+        "ipaddr":"0.0.0.0",
+        "upstream":"./dns-upstream.txt"  ,
+        "cachettl": 1,
+        "killfilettl": 12,
+        "singlefilters":"./urls-domains.txt" ,
+        "doublefilters":"./urls-hosts.txt", 
+        "blackholeip":"127.0.0.1",
+        "hostsfile":"./urls-local.txt"
+    }
+
+}

dns-upstream.txt

@@ -0,0 +1,387 @@
+194.150.168.168:53
+194.25.0.68:53
+141.1.1.1:53
+213.239.204.35:53
+194.25.0.52:53
+212.211.132.4:53
+213.68.194.51:53
+195.243.214.4:53
+141.1.27.249:53
+80.237.197.14:53
+217.28.98.62:53
+82.96.64.2:53
+82.96.65.2:53
+194.25.0.60:53
+193.101.111.10:53
+193.101.111.20:53
+192.76.144.66:53
+217.69.169.25:53
+85.88.19.10:53
+85.88.19.11:53
+85.214.20.141:53
+194.169.239.10:53
+194.172.160.4:53
+212.102.225.2:53
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dns_client.go

@@ -0,0 +1,98 @@
+package main
+
+import (
+	"fmt"
+	"time"
+
+	"math/rand"
+	"strings"
+
+	"github.com/miekg/dns"
+)
+
+//ForwardQuery forwards the query to the upstream server
+//first server to answer wins
+func ForwardQuery(query *dns.Msg) *dns.Msg {
+
+	go incrementStats("ForwardQueries", 1)
+
+	r := new(dns.Msg)
+	r.SetReply(query)
+	r.Authoritative = true
+
+	fqdn := strings.TrimRight(query.Question[0].Name, ".")
+
+	lfqdn := fmt.Sprintf("%d", query.Question[0].Qtype) + "." + fqdn
+	if cached := GetDomainFromCache(lfqdn); cached != nil {
+		go incrementStats("CacheHit", 1)
+		cached.SetReply(query)
+		cached.Authoritative = true
+		return cached
+
+	}
+
+	c := new(dns.Client)
+
+	c.ReadTimeout = 500 * time.Millisecond
+	c.WriteTimeout = 500 * time.Millisecond
+
+	for {
+		// round robin with retry
+
+		if !NetworkUp {
+			time.Sleep(10 * time.Second)
+			go incrementStats("Network Problems ", 1)
+			continue
+		}
+
+		d := oneTimeDNS()
+
+		in, _, err := c.Exchange(query, d)
+		if err != nil {
+			fmt.Printf("Problem with DNS %s : %s\n", d, err.Error())
+			go incrementStats("DNS Problems "+d, 1)
+			continue
+		} else {
+			go incrementStats(d, 1)
+			in.SetReply(query)
+			in.Authoritative = true
+			go DomainCache(lfqdn, in)
+			return in
+
+		}
+
+	}
+
+}
+
+func init() {
+
+	fmt.Println("DNS client engine starting")
+	NetworkUp = checkNetworkUp()
+
+	if NetworkUp {
+		fmt.Println("[OK]: Network is UP")
+	} else {
+		fmt.Println("[KO] Network is DOWN: system will check again in 2 minutes")
+	}
+
+}
+
+func oneTimeDNS() (dns string) {
+
+	rand.Seed(time.Now().Unix())
+
+	upl := ZabovDNSArray
+
+	if len(upl) < 1 {
+		fmt.Println("No DNS defined, using default 127.0.0.53:53. Hope it works!")
+		return "127.0.0.53:53"
+	}
+
+	n := rand.Intn(128*len(upl)) % len(upl)
+
+	dns = upl[n]
+
+	return
+
+}

dns_handler.go

@@ -0,0 +1,44 @@
+package main
+
+import (
+	"net"
+	"strings"
+
+	"github.com/miekg/dns"
+)
+
+func (mydns *handler) ServeDNS(w dns.ResponseWriter, r *dns.Msg) {
+	go incrementStats("TotalQueries", 1)
+
+	remIP, _, e := net.SplitHostPort(w.RemoteAddr().String())
+	if e != nil {
+		go incrementStats("CLIENT: "+remIP, 1)
+	}
+
+	msg := dns.Msg{}
+	msg.SetReply(r)
+
+	switch r.Question[0].Qtype {
+	case dns.TypeA:
+		msg.Authoritative = true
+		domain := msg.Question[0].Name
+		fqdn := strings.TrimRight(domain, ".")
+
+		if domainInKillfile(fqdn) {
+			go incrementStats("Killed", 1)
+
+			msg.Answer = append(msg.Answer, &dns.A{
+				Hdr: dns.RR_Header{Name: domain, Rrtype: dns.TypeA, Class: dns.ClassINET, Ttl: 60},
+				A:   net.ParseIP(ZabovAddBL),
+			})
+		} else {
+			ret := ForwardQuery(r)
+			w.WriteMsg(ret)
+		}
+	default:
+		ret := ForwardQuery(r)
+		w.WriteMsg(ret)
+	}
+	w.WriteMsg(&msg)
+
+}

go.mod

@@ -0,0 +1,8 @@
+module zabov
+
+go 1.13
+
+require (
+	github.com/miekg/dns v1.1.27
+	github.com/syndtr/goleveldb v1.0.0
+)

go.sum

@@ -0,0 +1,36 @@
+github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
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+github.com/golang/snappy v0.0.0-20180518054509-2e65f85255db/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
+github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU=
+github.com/miekg/dns v1.1.27 h1:aEH/kqUzUxGJ/UHcEKdJY+ugH6WEzsEBBSPa8zuy1aM=
+github.com/miekg/dns v1.1.27/go.mod h1:KNUDUusw/aVsxyTYZM1oqvCicbwhgbNgztCETuNZ7xM=
+github.com/onsi/ginkgo v1.6.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
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+github.com/onsi/gomega v1.4.3/go.mod h1:ex+gbHU/CVuBBDIJjb2X0qEXbFg53c61hWP/1CpauHY=
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+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
+gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
+gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

hostfile.go

@@ -0,0 +1,59 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+)
+
+func init() {
+
+	fmt.Println("Ingesting local hosts file")
+	ingestLocalBlacklist()
+
+}
+
+func ingestLocalBlacklist() {
+
+	file, err := os.Open(ZabovHostsFile)
+	if err != nil {
+		fmt.Println(err.Error())
+	}
+	defer file.Close()
+
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		d := scanner.Text()
+		DomainKill(d, ZabovHostsFile)
+		incrementStats("Blacklist", 1)
+
+	}
+
+	if err := scanner.Err(); err != nil {
+		fmt.Println(err.Error())
+	}
+
+}
+
+func fileByLines(filename string) (blurls []string) {
+
+	file, err := os.Open(filename)
+	if err != nil {
+		fmt.Println(err.Error())
+	}
+	defer file.Close()
+
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		d := scanner.Text()
+		blurls = append(blurls, d)
+
+	}
+
+	if err := scanner.Err(); err != nil {
+		fmt.Println(err.Error())
+	}
+
+	return
+
+}

main.go

@@ -0,0 +1,46 @@
+package main
+
+import (
+	"log"
+
+	"github.com/miekg/dns"
+)
+
+//MyDNS is my dns server
+var MyDNS *dns.Server
+
+//ZabovUpDNS keeps the name of upstream DNSs
+var ZabovUpDNS string
+
+