Changes to allow host "Set" to be standard, providers being able to use other query types, cache all responses, etc.

etc/godns.conf

@@ -29,7 +29,7 @@ maxcount = 0 #If set zero. The Sum of cache itmes will be unlimit.
 
     # Redis cache backend config
     [cache.redis]
-    host = "192.168.1.71"
+    host = "127.0.0.1"
     port = 6379
     db = 0
     password =""

etc/godns.example.conf

@@ -1,56 +0,0 @@
-#Toml config file
-title = "GODNS"
-Version = "0.2.3"
-Author = "kenshin, tystuyfzand"
-
-debug = false
-
-[server]
-host = ""
-port = 53
-
-[resolv]
-# Domain-specific nameservers configuration, formatting keep compatible with Dnsmasq
-# Semicolon separate multiple files.
-resolv-file = "/etc/resolv.conf"
-timeout = 5  # 5 seconds
-# The concurrency interval request upstream recursive server
-# Match the PR15, https://github.com/kenshinx/godns/pull/15
-interval = 200 # 200 milliseconds
-# When defined, this is preferred over regular DNS. This requires a resolver to be active besides this, only for the initial lookup.
-# A hosts file entry will suffice as well.
-# dns-over-https = "https://cloudflare-dns.com/dns-query"
-setedns0 = false #Support for larger UDP DNS responses
-
-[redis]
-enable = true
-host = "127.0.0.1"
-port = 6379
-db = 0
-password =""
-
-[memcache]
-servers = ["127.0.0.1:11211"]
-
-[log]
-stdout = true
-file = "./godns.log"
-level = "INFO"  #DEBUG | INFO |NOTICE | WARN | ERROR
-
-[cache]
-# backend option [memory|memcache|redis]
-backend = "memory"  
-expire = 600  # 10 minutes
-maxcount = 0 #If set zero. The Sum of cache items will be unlimit.
-
-[hosts]
-#If set false, will not query hosts file and redis hosts record
-enable = true
-host-file = "/etc/hosts"
-redis-enable = false
-redis-key = "godns:hosts"
-ttl = 600
-# Refresh interval can be high since we have automatic updating via push and fsnotify
-refresh-interval = 300
-
-

handler.go

@@ -13,12 +13,6 @@ import (
 	"time"
 )
 
-const (
-	notIPQuery = 0
-	_IP4Query  = 4
-	_IP6Query  = 6
-)
-
 type Handler struct {
 	resolver        *resolver.Resolver
 	cache, negCache cache.Cache
@@ -29,46 +23,48 @@ func NewHandler(r *resolver.Resolver, resolverCache, negCache cache.Cache, h hos
 	return &Handler{r, resolverCache, negCache, h}
 }
 
-func (h *Handler) do(Net string, w dns.ResponseWriter, req *dns.Msg) {
+func (h *Handler) do(network string, w dns.ResponseWriter, req *dns.Msg) {
 	q := req.Question[0]
-	question := resolver.Question{Name: utils.UnFqdn(q.Name), Type: dns.TypeToString[q.Qtype], Class: dns.ClassToString[q.Qclass]}
+	question := resolver.Question{Name: utils.UnFqdn(q.Name), Type: q.Qtype, Class: dns.ClassToString[q.Qclass]}
 
 	var remote net.IP
-	if Net == "tcp" {
-		remote = w.RemoteAddr().(*net.TCPAddr).IP
-	} else {
-		remote = w.RemoteAddr().(*net.UDPAddr).IP
+
+	switch t := w.RemoteAddr().(type) {
+	case *net.TCPAddr:
+		remote = t.IP
+	case *net.UDPAddr:
+		remote = t.IP
+	default:
+		return
 	}
+
 	log.Info("%s lookup　%s", remote, question.String())
 
-	IPQuery := h.isIPQuery(q)
-
 	// Query hosts
-	if h.hosts != nil && IPQuery > 0 {
-		if ips, ttl, ok := h.hosts.Get(question.Name, IPQuery); ok {
+	if h.hosts != nil {
+		if vals, ttl, ok := h.hosts.Get(question.Type, question.Name); ok {
 			m := new(dns.Msg)
 			m.SetReply(req)
 
-			switch IPQuery {
-			case _IP4Query:
-				hdr := dns.RR_Header{
-					Name:   q.Name,
-					Rrtype: dns.TypeA,
-					Class:  dns.ClassINET,
-					Ttl:    uint32(ttl / time.Second),
+			hdr := dns.RR_Header{
+				Name: q.Name,
+				Rrtype: question.Type,
+				Class: dns.ClassINET,
+				Ttl: uint32(ttl / time.Second),
+			}
+
+			switch question.Type {
+			case dns.TypeA:
+				for _, val := range vals {
+					m.Answer = append(m.Answer, &dns.A{Hdr: hdr, A: net.ParseIP(val).To4()})
 				}
-				for _, ip := range ips {
-					m.Answer = append(m.Answer, &dns.A{Hdr: hdr, A: ip})
+			case dns.TypeAAAA:
+				for _, val := range vals {
+					m.Answer = append(m.Answer, &dns.AAAA{Hdr: hdr, AAAA: net.ParseIP(val).To16()})
 				}
-			case _IP6Query:
-				hdr := dns.RR_Header{
-					Name:   q.Name,
-					Rrtype: dns.TypeAAAA,
-					Class:  dns.ClassINET,
-					Ttl:    uint32(ttl / time.Second),
-				}
-				for _, ip := range ips {
-					m.Answer = append(m.Answer, &dns.AAAA{Hdr: hdr, AAAA: ip})
+			case dns.TypeCNAME:
+				for _, val := range vals {
+					m.Answer = append(m.Answer, &dns.CNAME{Hdr: hdr, Target: val})
 				}
 			}
 
@@ -80,29 +76,28 @@ func (h *Handler) do(Net string, w dns.ResponseWriter, req *dns.Msg) {
 		}
 	}
 
-	// Only query cache when qtype == 'A'|'AAAA' , qclass == 'IN'
 	key := KeyGen(question)
-	if IPQuery > 0 {
-		mesg, err := h.cache.Get(key)
-		if err != nil {
-			if mesg, err = h.negCache.Get(key); err != nil {
-				log.Debug("%s didn't hit cache", question.String())
-			} else {
-				log.Debug("%s hit negative cache", question.String())
-				dns.HandleFailed(w, req)
-				return
-			}
+
+	mesg, err := h.cache.Get(key)
+
+	if err != nil {
+		if mesg, err = h.negCache.Get(key); err != nil {
+			log.Debug("%s didn't hit cache", question.String())
 		} else {
-			log.Debug("%s hit cache", question.String())
-			// we need this copy against concurrent modification of Id
-			msg := *mesg
-			msg.Id = req.Id
-			w.WriteMsg(&msg)
+			log.Debug("%s hit negative cache", question.String())
+			dns.HandleFailed(w, req)
 			return
 		}
+	} else {
+		log.Debug("%s hit cache", question.String())
+		// we need this copy against concurrent modification of Id
+		msg := *mesg
+		msg.Id = req.Id
+		w.WriteMsg(&msg)
+		return
 	}
 
-	mesg, err := h.resolver.Lookup(Net, req)
+	mesg, err = h.resolver.Lookup(network, req)
 
 	if err != nil {
 		log.Warn("Resolve query error %s", err)
@@ -117,7 +112,7 @@ func (h *Handler) do(Net string, w dns.ResponseWriter, req *dns.Msg) {
 
 	w.WriteMsg(mesg)
 
-	if IPQuery > 0 && len(mesg.Answer) > 0 {
+	if len(mesg.Answer) > 0 {
 		err = h.cache.Set(key, mesg)
 		if err != nil {
 			log.Warn("Set %s cache failed: %s", question.String(), err.Error())
@@ -132,21 +127,6 @@ func (h *Handler) Bind(net string) func(w dns.ResponseWriter, req *dns.Msg) {
 	}
 }
 
-func (h *Handler) isIPQuery(q dns.Question) int {
-	if q.Qclass != dns.ClassINET {
-		return notIPQuery
-	}
-
-	switch q.Qtype {
-	case dns.TypeA:
-		return _IP4Query
-	case dns.TypeAAAA:
-		return _IP6Query
-	default:
-		return notIPQuery
-	}
-}
-
 func KeyGen(q resolver.Question) string {
 	h := md5.New()
 	h.Write([]byte(q.String()))

hosts/hosts.go

@@ -1,22 +1,15 @@
 package hosts
 
 import (
-	"net"
 	"time"
 )
 
-const (
-	notIPQuery = 0
-	_IP4Query  = 4
-	_IP6Query  = 6
-)
-
 var (
 	zeroDuration = time.Duration(0)
 )
 
 type Hosts interface {
-	Get(domain string, family int) ([]net.IP, time.Duration, bool)
+	Get(queryType uint16, domain string) ([]string, time.Duration, bool)
 }
 
 type ProviderList struct {
@@ -24,7 +17,8 @@ type ProviderList struct {
 }
 
 type Provider interface {
-	Get(domain string) ([]string, time.Duration, bool)
+	Get(queryType uint16, domain string) ([]string, time.Duration, bool)
+	Set(t, domain, value string) (bool, error)
 }
 
 func NewHosts(providers []Provider) Hosts {
@@ -34,38 +28,22 @@ func NewHosts(providers []Provider) Hosts {
 /*
 Match local /etc/hosts file first, remote redis records second
 */
-func (h *ProviderList) Get(domain string, family int) ([]net.IP, time.Duration, bool) {
-	var sips []string
+func (h *ProviderList) Get(queryType uint16, domain string) ([]string, time.Duration, bool) {
+	var vals []string
 	var ok bool
-	var ip net.IP
-	var ips []net.IP
 	var ttl time.Duration
 
 	for _, provider := range h.providers {
-		sips, ttl, ok = provider.Get(domain)
+		vals, ttl, ok = provider.Get(queryType, domain)
 
 		if ok {
 			break
 		}
 	}
 
-	if sips == nil {
+	if vals == nil {
 		return nil, zeroDuration, false
 	}
 
-	for _, sip := range sips {
-		switch family {
-		case _IP4Query:
-			ip = net.ParseIP(sip).To4()
-		case _IP6Query:
-			ip = net.ParseIP(sip).To16()
-		default:
-			continue
-		}
-		if ip != nil {
-			ips = append(ips, ip)
-		}
-	}
-
-	return ips, ttl, ips != nil
+	return vals, ttl, true
 }

hosts/hosts_file.go

@@ -2,7 +2,9 @@ package hosts
 
 import (
 	"bufio"
+	"errors"
 	"github.com/fsnotify/fsnotify"
+	"github.com/miekg/dns"
 	"github.com/ryanuber/go-glob"
 	"meow.tf/joker/godns/log"
 	"meow.tf/joker/godns/utils"
@@ -49,8 +51,13 @@ func NewFileProvider(file string, ttl time.Duration) Provider {
 	return fp
 }
 
-func (f *FileHosts) Get(domain string) ([]string, time.Duration, bool) {
-	log.Debug("Checking file provider for %s", domain)
+func (f *FileHosts) Get(queryType uint16, domain string) ([]string, time.Duration, bool) {
+	log.Debug("Checking file provider for %s : %s", queryType, domain)
+
+	// Does not support CNAME/TXT/etc
+	if queryType != dns.TypeA && queryType != dns.TypeAAAA {
+		return nil, zeroDuration, false
+	}
 
 	f.mu.RLock()
 	defer f.mu.RUnlock()
@@ -77,6 +84,10 @@ func (f *FileHosts) Get(domain string) ([]string, time.Duration, bool) {
 	return nil, time.Duration(0), false
 }
 
+func (f *FileHosts) Set(t, domain, value string) (bool, error) {
+	return false, errors.New("file provider does not support setting values")
+}
+
 var (
 	hostRegexp = regexp.MustCompile("^(.*?)\\s+(.*)$")
 )

hosts/hosts_redis.go

@@ -2,6 +2,7 @@ package hosts
 
 import (
 	"github.com/go-redis/redis/v7"
+	"github.com/miekg/dns"
 	"github.com/ryanuber/go-glob"
 	"meow.tf/joker/godns/log"
 	"strings"
@@ -33,9 +34,14 @@ func NewRedisProvider(rc *redis.Client, key string, ttl time.Duration) Provider
 	return rh
 }
 
-func (r *RedisHosts) Get(domain string) ([]string, time.Duration, bool) {
+func (r *RedisHosts) Get(queryType uint16, domain string) ([]string, time.Duration, bool) {
 	log.Debug("Checking redis provider for %s", domain)
 
+	// Don't support queries other than A/AAAA for now
+	if queryType != dns.TypeA || queryType != dns.TypeAAAA {
+		return nil, zeroDuration, false
+	}
+
 	r.mu.RLock()
 	defer r.mu.RUnlock()
 
@@ -62,7 +68,7 @@ func (r *RedisHosts) Get(domain string) ([]string, time.Duration, bool) {
 	return nil, time.Duration(0), false
 }
 
-func (r *RedisHosts) Set(domain, ip string) (bool, error) {
+func (r *RedisHosts) Set(t, domain, ip string) (bool, error) {
 	r.mu.Lock()
 	defer r.mu.Unlock()
 	return r.redis.HSet(r.key, strings.ToLower(domain), []byte(ip)).Result()

main.go

@@ -48,7 +48,7 @@ func main() {
 	}
 
 	var resolverCache, negCache cache.Cache
-	r := resolver.NewResolver(settings.ResolvSettings{
+	r := resolver.NewResolver(resolver.Settings{
 		Timeout:        viper.GetInt("resolv.timeout"),
 		Interval:       viper.GetInt("resolv.interval"),
 		SetEDNS0:       viper.GetBool("resolv.edns0"),

resolver/question.go

@@ -1,11 +1,13 @@
 package resolver
 
+import "github.com/miekg/dns"
+
 type Question struct {
 	Name  string
-	Type  string
+	Type  uint16
 	Class string
 }
 
 func (q *Question) String() string {
-	return q.Name + " " + q.Class + " " + q.Type
+	return q.Name + " " + q.Class + " " + dns.TypeToString[q.Type]
 }

resolver/resolver.go

@@ -5,7 +5,6 @@ import (
 	"errors"
 	"fmt"
 	"meow.tf/joker/godns/log"
-	"meow.tf/joker/godns/settings"
 	"meow.tf/joker/godns/utils"
 	"net"
 	"os"
@@ -37,13 +36,13 @@ type RResp struct {
 type Resolver struct {
 	servers       []string
 	domain_server *suffixTreeNode
-	config        *settings.ResolvSettings
+	config        *Settings
 
 	clients map[string]*dns.Client
 	clientLock sync.RWMutex
 }
 
-func NewResolver(c settings.ResolvSettings) *Resolver {
+func NewResolver(c Settings) *Resolver {
 	r := &Resolver{
 		servers:       []string{},
 		domain_server: newSuffixTreeRoot(),
@@ -109,26 +108,26 @@ func (r *Resolver) parseServerListFile(buf *os.File) {
 
 			r.domain_server.sinsert(strings.Split(domain, "."), ip)
 		case 1:
-			srv_port := strings.Split(line, "#")
+			srvPort := strings.Split(line, "#")
 
-			if len(srv_port) > 2 {
+			if len(srvPort) > 2 {
 				continue
 			}
 
 			ip := ""
 
-			if ip = srv_port[0]; !utils.IsIP(ip) {
+			if ip = srvPort[0]; !utils.IsIP(ip) {
 				continue
 			}
 
 			port := "53"
 
-			if len(srv_port) == 2 {
-				if _, err := strconv.Atoi(srv_port[1]); err != nil {
+			if len(srvPort) == 2 {
+				if _, err := strconv.Atoi(srvPort[1]); err != nil {
 					continue
 				}
 
-				port = srv_port[1]
+				port = srvPort[1]
 			}
 
 			r.servers = append(r.servers, net.JoinHostPort(ip, port))
@@ -222,8 +221,14 @@ func (r *Resolver) Lookup(net string, req *dns.Msg) (message *dns.Msg, err error
 }
 
 func (r *Resolver) resolverFor(net, nameserver string) (*dns.Client, error) {
+	key := net
+
+	if net == "tcp-tls" {
+		key = net + ":" + nameserver
+	}
+
 	r.clientLock.RLock()
-	client, exists := r.clients[net]
+	client, exists := r.clients[key]
 	r.clientLock.RUnlock()
 
 	if exists {
@@ -249,7 +254,7 @@ func (r *Resolver) resolverFor(net, nameserver string) (*dns.Client, error) {
 	}
 
 	r.clientLock.Lock()
-	r.clients[net] = client
+	r.clients[key] = client
 	r.clientLock.Lock()
 
 	return client, nil

resolver/settings.go

@@ -0,0 +1,9 @@
+package resolver
+
+type Settings struct {
+	Timeout        int `toml:"timeout" env:"RESOLV_TIMEOUT"`
+	Interval       int `toml:"interval" env:"RESOLV_INTERVAL"`
+	SetEDNS0       bool `toml:"setedns0" env:"RESOLV_EDNS0"`
+	ServerListFile []string `toml:"server-list-file" env:"SERVER_LIST_FILE"`
+	ResolvFile     string `toml:"resolv-file" env:"RESOLV_FILE"`
+}