Tiny replacement for piHole DNS filter
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2.5 KiB

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, configs stringarray) error {
fmt.Println("DoubleIndexFilter: Retrieving HostFile from: ", durl)
// resets malformed HostLines for url
setstatsvalue("Malformed HostLines "+durl, 0)
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()
if len(line) == 0 || strings.TrimSpace(line)[0] == '#' {
continue
}
h := strings.FieldsFunc(line, splitter)
if h == nil {
continue
}
if len(h) < 2 {
continue
}
if net.ParseIP(h[0]) != nil {
DomainKill(h[1], durl, configs)
// 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(urls urlsMap) {
fmt.Println("getDoubleFilters: downloading all urls:", len(urls))
for url, configs := range urls {
DoubleIndexFilter(url, configs)
}
fmt.Println("getDoubleFilters: DONE!")
}
func downloadDoubleThread() {
fmt.Println("Starting updater of DOUBLE lists, each (hours):", ZabovKillTTL)
time.Sleep(2 * time.Second) // wait for local DNS server up & running (may be our DNS)
_urls := urlsMap{}
for {
fmt.Println("downloadDoubleThread: collecting urls from all configs...")
for config := range ZabovConfigs {
ZabovDoubleBL := ZabovConfigs[config].ZabovDoubleBL
if len(ZabovDoubleBL) == 0 {
continue
}
s := fileByLines(ZabovDoubleBL)
for _, v := range s {
if len(v) == 0 || strings.TrimSpace(v)[0] == '#' {
continue
}
configs := _urls[v]
if configs == nil {
configs = stringarray{}
_urls[v] = configs
}
configs = append(configs, config)
_urls[v] = configs
}
}
getDoubleFilters(_urls)
time.Sleep(time.Duration(ZabovKillTTL) * time.Hour)
}
}