* rDNS: refactor: move code to a separate file
This commit is contained in:
Simon Zolin
parent
a59b6b3054
commit
4f08f96607
110
home/dns.go
110
home/dns.go
|
|
@ -4,9 +4,7 @@ import (
|
|||
"fmt"
|
||||
"net"
|
||||
"os"
|
||||
"strings"
|
||||
"sync"
|
||||
"time"
|
||||
|
||||
"github.com/AdguardTeam/AdGuardHome/dnsfilter"
|
||||
"github.com/AdguardTeam/AdGuardHome/dnsforward"
|
||||
|
|
@ -17,10 +15,6 @@ import (
|
|||
"github.com/miekg/dns"
|
||||
)
|
||||
|
||||
const (
|
||||
rdnsTimeout = 3 * time.Second // max time to wait for rDNS response
|
||||
)
|
||||
|
||||
type dnsContext struct {
|
||||
rdnsChannel chan string // pass data from DNS request handling thread to rDNS thread
|
||||
// contains IP addresses of clients to be resolved by rDNS
|
||||
|
|
@ -41,115 +35,13 @@ func initDNSServer(baseDir string) {
|
|||
|
||||
config.dnsServer = dnsforward.NewServer(baseDir)
|
||||
|
||||
bindhost := config.DNS.BindHost
|
||||
if config.DNS.BindHost == "0.0.0.0" {
|
||||
bindhost = "127.0.0.1"
|
||||
}
|
||||
resolverAddress := fmt.Sprintf("%s:%d", bindhost, config.DNS.Port)
|
||||
opts := upstream.Options{
|
||||
Timeout: rdnsTimeout,
|
||||
}
|
||||
config.dnsctx.upstream, err = upstream.AddressToUpstream(resolverAddress, opts)
|
||||
if err != nil {
|
||||
log.Error("upstream.AddressToUpstream: %s", err)
|
||||
return
|
||||
}
|
||||
|
||||
config.dnsctx.rdnsIP = make(map[string]bool)
|
||||
config.dnsctx.rdnsChannel = make(chan string, 256)
|
||||
go asyncRDNSLoop()
|
||||
initRDNS()
|
||||
}
|
||||
|
||||
func isRunning() bool {
|
||||
return config.dnsServer != nil && config.dnsServer.IsRunning()
|
||||
}
|
||||
|
||||
func beginAsyncRDNS(ip string) {
|
||||
if config.clients.Exists(ip) {
|
||||
return
|
||||
}
|
||||
|
||||
// add IP to rdnsIP, if not exists
|
||||
config.dnsctx.rdnsLock.Lock()
|
||||
defer config.dnsctx.rdnsLock.Unlock()
|
||||
_, ok := config.dnsctx.rdnsIP[ip]
|
||||
if ok {
|
||||
return
|
||||
}
|
||||
config.dnsctx.rdnsIP[ip] = true
|
||||
|
||||
log.Tracef("Adding %s for rDNS resolve", ip)
|
||||
select {
|
||||
case config.dnsctx.rdnsChannel <- ip:
|
||||
//
|
||||
default:
|
||||
log.Tracef("rDNS queue is full")
|
||||
}
|
||||
}
|
||||
|
||||
// Use rDNS to get hostname by IP address
|
||||
func resolveRDNS(ip string) string {
|
||||
log.Tracef("Resolving host for %s", ip)
|
||||
|
||||
req := dns.Msg{}
|
||||
req.Id = dns.Id()
|
||||
req.RecursionDesired = true
|
||||
req.Question = []dns.Question{
|
||||
{
|
||||
Qtype: dns.TypePTR,
|
||||
Qclass: dns.ClassINET,
|
||||
},
|
||||
}
|
||||
var err error
|
||||
req.Question[0].Name, err = dns.ReverseAddr(ip)
|
||||
if err != nil {
|
||||
log.Debug("Error while calling dns.ReverseAddr(%s): %s", ip, err)
|
||||
return ""
|
||||
}
|
||||
|
||||
resp, err := config.dnsctx.upstream.Exchange(&req)
|
||||
if err != nil {
|
||||
log.Error("Error while making an rDNS lookup for %s: %s", ip, err)
|
||||
return ""
|
||||
}
|
||||
if len(resp.Answer) != 1 {
|
||||
log.Debug("No answer for rDNS lookup of %s", ip)
|
||||
return ""
|
||||
}
|
||||
ptr, ok := resp.Answer[0].(*dns.PTR)
|
||||
if !ok {
|
||||
log.Error("not a PTR response for %s", ip)
|
||||
return ""
|
||||
}
|
||||
|
||||
log.Tracef("PTR response for %s: %s", ip, ptr.String())
|
||||
if strings.HasSuffix(ptr.Ptr, ".") {
|
||||
ptr.Ptr = ptr.Ptr[:len(ptr.Ptr)-1]
|
||||
}
|
||||
|
||||
return ptr.Ptr
|
||||
}
|
||||
|
||||
// Wait for a signal and then synchronously resolve hostname by IP address
|
||||
// Add the hostname:IP pair to "Clients" array
|
||||
func asyncRDNSLoop() {
|
||||
for {
|
||||
var ip string
|
||||
ip = <-config.dnsctx.rdnsChannel
|
||||
|
||||
host := resolveRDNS(ip)
|
||||
if len(host) == 0 {
|
||||
continue
|
||||
}
|
||||
|
||||
config.dnsctx.rdnsLock.Lock()
|
||||
delete(config.dnsctx.rdnsIP, ip)
|
||||
config.dnsctx.rdnsLock.Unlock()
|
||||
|
||||
_, _ = config.clients.AddHost(ip, host, ClientSourceRDNS)
|
||||
}
|
||||
}
|
||||
|
||||
func onDNSRequest(d *proxy.DNSContext) {
|
||||
qType := d.Req.Question[0].Qtype
|
||||
if qType != dns.TypeA && qType != dns.TypeAAAA {
|
||||
|
|
|
|||
|
|
@ -0,0 +1,125 @@
|
|||
package home
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"strings"
|
||||
"time"
|
||||
|
||||
"github.com/AdguardTeam/dnsproxy/upstream"
|
||||
"github.com/AdguardTeam/golibs/log"
|
||||
"github.com/miekg/dns"
|
||||
)
|
||||
|
||||
const (
|
||||
rdnsTimeout = 3 * time.Second // max time to wait for rDNS response
|
||||
)
|
||||
|
||||
func initRDNS() {
|
||||
var err error
|
||||
|
||||
bindhost := config.DNS.BindHost
|
||||
if config.DNS.BindHost == "0.0.0.0" {
|
||||
bindhost = "127.0.0.1"
|
||||
}
|
||||
resolverAddress := fmt.Sprintf("%s:%d", bindhost, config.DNS.Port)
|
||||
|
||||
opts := upstream.Options{
|
||||
Timeout: rdnsTimeout,
|
||||
}
|
||||
config.dnsctx.upstream, err = upstream.AddressToUpstream(resolverAddress, opts)
|
||||
if err != nil {
|
||||
log.Error("upstream.AddressToUpstream: %s", err)
|
||||
return
|
||||
}
|
||||
|
||||
config.dnsctx.rdnsIP = make(map[string]bool)
|
||||
config.dnsctx.rdnsChannel = make(chan string, 256)
|
||||
go asyncRDNSLoop()
|
||||
}
|
||||
|
||||
// Add IP address to the rDNS queue
|
||||
func beginAsyncRDNS(ip string) {
|
||||
if config.clients.Exists(ip) {
|
||||
return
|
||||
}
|
||||
|
||||
// add IP to rdnsIP, if not exists
|
||||
config.dnsctx.rdnsLock.Lock()
|
||||
defer config.dnsctx.rdnsLock.Unlock()
|
||||
_, ok := config.dnsctx.rdnsIP[ip]
|
||||
if ok {
|
||||
return
|
||||
}
|
||||
config.dnsctx.rdnsIP[ip] = true
|
||||
|
||||
log.Tracef("Adding %s for rDNS resolve", ip)
|
||||
select {
|
||||
case config.dnsctx.rdnsChannel <- ip:
|
||||
//
|
||||
default:
|
||||
log.Tracef("rDNS queue is full")
|
||||
}
|
||||
}
|
||||
|
||||
// Use rDNS to get hostname by IP address
|
||||
func resolveRDNS(ip string) string {
|
||||
log.Tracef("Resolving host for %s", ip)
|
||||
|
||||
req := dns.Msg{}
|
||||
req.Id = dns.Id()
|
||||
req.RecursionDesired = true
|
||||
req.Question = []dns.Question{
|
||||
{
|
||||
Qtype: dns.TypePTR,
|
||||
Qclass: dns.ClassINET,
|
||||
},
|
||||
}
|
||||
var err error
|
||||
req.Question[0].Name, err = dns.ReverseAddr(ip)
|
||||
if err != nil {
|
||||
log.Debug("Error while calling dns.ReverseAddr(%s): %s", ip, err)
|
||||
return ""
|
||||
}
|
||||
|
||||
resp, err := config.dnsctx.upstream.Exchange(&req)
|
||||
if err != nil {
|
||||
log.Error("Error while making an rDNS lookup for %s: %s", ip, err)
|
||||
return ""
|
||||
}
|
||||
if len(resp.Answer) != 1 {
|
||||
log.Debug("No answer for rDNS lookup of %s", ip)
|
||||
return ""
|
||||
}
|
||||
ptr, ok := resp.Answer[0].(*dns.PTR)
|
||||
if !ok {
|
||||
log.Error("not a PTR response for %s", ip)
|
||||
return ""
|
||||
}
|
||||
|
||||
log.Tracef("PTR response for %s: %s", ip, ptr.String())
|
||||
if strings.HasSuffix(ptr.Ptr, ".") {
|
||||
ptr.Ptr = ptr.Ptr[:len(ptr.Ptr)-1]
|
||||
}
|
||||
|
||||
return ptr.Ptr
|
||||
}
|
||||
|
||||
// Wait for a signal and then synchronously resolve hostname by IP address
|
||||
// Add the hostname:IP pair to "Clients" array
|
||||
func asyncRDNSLoop() {
|
||||
for {
|
||||
var ip string
|
||||
ip = <-config.dnsctx.rdnsChannel
|
||||
|
||||
host := resolveRDNS(ip)
|
||||
if len(host) == 0 {
|
||||
continue
|
||||
}
|
||||
|
||||
config.dnsctx.rdnsLock.Lock()
|
||||
delete(config.dnsctx.rdnsIP, ip)
|
||||
config.dnsctx.rdnsLock.Unlock()
|
||||
|
||||
_, _ = config.clients.AddHost(ip, host, ClientSourceRDNS)
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue