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options.go
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options.go
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package gochinadns
import (
"bufio"
"errors"
"fmt"
"net"
"os"
"time"
"github.com/yl2chen/cidranger"
)
var (
ErrEmptyPath = errors.New("empty path")
)
// ServerOption provides ChinaDNS server options. Please use WithXXX functions to generate Options.
type ServerOption func(*serverOptions) error
type serverOptions struct {
Listen string // Listening address, such as `[::]:53`, `0.0.0.0:53`
ChinaCIDR cidranger.Ranger // CIDR ranger to check whether an IP belongs to China
IPBlacklist cidranger.Ranger
DomainBlacklist *domainTrie
DomainPolluted *domainTrie
Servers resolverList // DNS servers, will be partitioned into TrustedServers and UntrustedServers in bootstrap.
TrustedServers resolverList // DNS servers which can be trusted
UntrustedServers resolverList // DNS servers which may return polluted results
Bidirectional bool // Drop results of trusted servers which containing IPs in China
ReusePort bool // Enable SO_REUSEPORT
Delay time.Duration // Delay (in seconds) to query another DNS server when no reply received
TestDomains []string // Domain names to test connection health before starting a server
SkipRefine bool
}
func newServerOptions() *serverOptions {
return &serverOptions{
Listen: "[::]:53",
TestDomains: []string{"qq.com"},
ChinaCIDR: cidranger.NewPCTrieRanger(),
IPBlacklist: cidranger.NewPCTrieRanger(),
}
}
func WithListenAddr(addr string) ServerOption {
return func(o *serverOptions) error {
o.Listen = addr
return nil
}
}
func WithCHNList(path string) ServerOption {
return func(o *serverOptions) error {
if path == "" {
return fmt.Errorf("%w for China route list", ErrEmptyPath)
}
file, err := os.Open(path)
if err != nil {
return fmt.Errorf("fail to open China route list: %w", err)
}
defer file.Close()
if o.ChinaCIDR == nil {
o.ChinaCIDR = cidranger.NewPCTrieRanger()
}
scanner := bufio.NewScanner(file)
for scanner.Scan() {
_, network, err := net.ParseCIDR(scanner.Text())
if err != nil {
return fmt.Errorf("parse %s as CIDR failed: %v", scanner.Text(), err.Error())
}
err = o.ChinaCIDR.Insert(cidranger.NewBasicRangerEntry(*network))
if err != nil {
return fmt.Errorf("insert %s as CIDR failed: %v", scanner.Text(), err.Error())
}
}
if err := scanner.Err(); err != nil {
return fmt.Errorf("fail to scan china route list: %v", err.Error())
}
return nil
}
}
func WithIPBlacklist(path string) ServerOption {
return func(o *serverOptions) error {
if path == "" {
return fmt.Errorf("%w for IP blacklist", ErrEmptyPath)
}
file, err := os.Open(path)
if err != nil {
return fmt.Errorf("fail to open IP blacklist: %w", err)
}
defer file.Close()
if o.IPBlacklist == nil {
o.IPBlacklist = cidranger.NewPCTrieRanger()
}
scanner := bufio.NewScanner(file)
for scanner.Scan() {
_, network, err := net.ParseCIDR(scanner.Text())
if err != nil {
ip := net.ParseIP(scanner.Text())
if ip == nil {
return fmt.Errorf("parse %s as CIDR failed: %v", scanner.Text(), err.Error())
}
l := 8 * len(ip)
network = &net.IPNet{IP: ip, Mask: net.CIDRMask(l, l)}
}
err = o.IPBlacklist.Insert(cidranger.NewBasicRangerEntry(*network))
if err != nil {
return fmt.Errorf("insert %s as CIDR failed: %v", scanner.Text(), err.Error())
}
}
if err := scanner.Err(); err != nil {
return fmt.Errorf("fail to scan IP blacklist: %v", err.Error())
}
return nil
}
}
func WithDomainBlacklist(path string) ServerOption {
return func(o *serverOptions) error {
if path == "" {
return fmt.Errorf("%w for domain blacklist", ErrEmptyPath)
}
file, err := os.Open(path)
if err != nil {
return fmt.Errorf("fail to open domain blacklist: %w", err)
}
defer file.Close()
if o.DomainBlacklist == nil {
o.DomainBlacklist = new(domainTrie)
}
scanner := bufio.NewScanner(file)
for scanner.Scan() {
o.DomainBlacklist.Add(scanner.Text())
}
if err := scanner.Err(); err != nil {
return fmt.Errorf("fail to scan domain blacklist: %v", err.Error())
}
return nil
}
}
func WithDomainPolluted(path string) ServerOption {
return func(o *serverOptions) error {
if path == "" {
return fmt.Errorf("%w for polluted domain list", ErrEmptyPath)
}
file, err := os.Open(path)
if err != nil {
return fmt.Errorf("fail to open polluted domain list: %w", err)
}
defer file.Close()
if o.DomainPolluted == nil {
o.DomainPolluted = new(domainTrie)
}
scanner := bufio.NewScanner(file)
for scanner.Scan() {
o.DomainPolluted.Add(scanner.Text())
}
if err := scanner.Err(); err != nil {
return fmt.Errorf("fail to scan polluted domain list: %v", err.Error())
}
return nil
}
}
func WithTrustedResolvers(tcpOnly bool, resolvers ...string) ServerOption {
return func(o *serverOptions) error {
for _, schema := range resolvers {
newResolver, err := ParseResolver(schema, tcpOnly)
if err != nil {
return err
}
o.TrustedServers = uniqueAppendResolver(o.TrustedServers, newResolver)
}
return nil
}
}
func WithResolvers(tcpOnly bool, resolvers ...string) ServerOption {
return func(o *serverOptions) error {
for _, schema := range resolvers {
newResolver, err := ParseResolver(schema, tcpOnly)
if err != nil {
return err
}
o.Servers = uniqueAppendResolver(o.Servers, newResolver)
}
return nil
}
}
func uniqueAppendString(to []string, item string) []string {
for _, e := range to {
if item == e {
return to
}
}
return append(to, item)
}
func uniqueAppendResolver(to []*Resolver, item *Resolver) []*Resolver {
for _, e := range to {
if item.GetAddr() == e.GetAddr() {
return to
}
}
return append(to, item)
}
func WithBidirectional(b bool) ServerOption {
return func(o *serverOptions) error {
o.Bidirectional = b
return nil
}
}
func WithReusePort(b bool) ServerOption {
return func(o *serverOptions) error {
o.ReusePort = b
return nil
}
}
func WithDelay(t time.Duration) ServerOption {
return func(o *serverOptions) error {
o.Delay = t
return nil
}
}
func WithTestDomains(testDomains ...string) ServerOption {
return func(o *serverOptions) error {
o.TestDomains = testDomains
return nil
}
}
func WithSkipRefineResolvers(skip bool) ServerOption {
return func(o *serverOptions) error {
o.SkipRefine = skip
return nil
}
}