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block.go
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block.go
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// Copyright (c) 2016-present Cloud <cloud@txthinking.com>
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of version 3 of the GNU General Public
// License as published by the Free Software Foundation.
//
// 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/>.
package block
import (
"errors"
"log"
"net"
"strings"
"sync"
"time"
cache "github.com/patrickmn/go-cache"
"github.com/txthinking/brook"
)
type Block struct {
DomainList string
CIDR4List string
CIDR6List string
Domain map[string]byte
CIDR4 []*net.IPNet
CIDR6 []*net.IPNet
GeoIP []string
Cache *cache.Cache
Lock *sync.RWMutex
Duration int
Done chan byte
}
func NewBlock(domainList, cidr4List, cidr6List string, geoIP []string, update int) (*Block, error) {
var err error
var ds map[string]byte
if domainList != "" {
ds, err = brook.ReadDomainList(domainList)
if err != nil {
return nil, err
}
}
var c4 []*net.IPNet
if cidr4List != "" {
c4, err = brook.ReadCIDRList(cidr4List)
if err != nil {
return nil, err
}
}
var c6 []*net.IPNet
if cidr6List != "" {
c6, err = brook.ReadCIDRList(cidr6List)
if err != nil {
return nil, err
}
}
b := &Block{
DomainList: domainList,
CIDR4List: cidr4List,
CIDR6List: cidr6List,
Domain: ds,
CIDR4: c4,
CIDR6: c6,
GeoIP: geoIP,
Cache: cache.New(cache.NoExpiration, cache.NoExpiration),
Duration: update,
}
if update != 0 {
b.Lock = &sync.RWMutex{}
b.Done = make(chan byte)
}
return b, nil
}
func (bk *Block) Update() {
ticker := time.NewTicker(time.Duration(bk.Duration) * time.Second)
defer ticker.Stop()
for {
select {
case <-bk.Done:
return
case <-ticker.C:
var err error
var ds map[string]byte
if bk.DomainList != "" {
ds, err = brook.ReadDomainList(bk.DomainList)
if err != nil {
log.Println("ReadDomainList", bk.DomainList, err)
break
}
}
var c4 []*net.IPNet
if bk.CIDR4List != "" {
c4, err = brook.ReadCIDRList(bk.CIDR4List)
if err != nil {
log.Println("ReadCIDRList", bk.CIDR4List, err)
break
}
}
var c6 []*net.IPNet
if bk.CIDR6List != "" {
c6, err = brook.ReadCIDRList(bk.CIDR6List)
if err != nil {
log.Println("ReadCIDRList", bk.CIDR6List, err)
break
}
}
bk.Lock.Lock()
bk.Domain = ds
bk.CIDR4 = c4
bk.CIDR6 = c6
if bk.Cache != nil {
bk.Cache.Flush()
}
bk.Lock.Unlock()
}
}
}
func (bk *Block) Stop() {
select {
case <-bk.Done:
default:
close(bk.Done)
}
}
func (bk *Block) TouchBrook() {
f := brook.Resolve
brook.Resolve = func(network string, addr string) (net.Addr, error) {
var ds map[string]byte
var c4 []*net.IPNet
var c6 []*net.IPNet
if bk.Lock != nil {
bk.Lock.RLock()
}
ds = bk.Domain
c4 = bk.CIDR4
c6 = bk.CIDR6
if bk.Lock != nil {
bk.Lock.RUnlock()
}
h, _, err := net.SplitHostPort(addr)
if err != nil {
return nil, err
}
var a net.Addr
ip := net.ParseIP(h)
if ip == nil {
if brook.ListHasDomain(ds, strings.ToLower(h), bk.Cache) {
return nil, errors.New("block " + addr)
}
a, err = f(network, addr)
if err != nil {
return nil, err
}
v, ok := a.(*net.TCPAddr)
if ok {
ip = v.IP
}
if !ok {
ip = a.(*net.UDPAddr).IP
}
}
if brook.ListHasIP(c4, c6, ip, bk.Cache, bk.GeoIP) {
return nil, errors.New("block " + addr)
}
if a != nil {
return a, nil
}
return f(network, addr)
}
}