diff --git a/cache.go b/cache/cache.go
similarity index 74%
rename from cache.go
rename to cache/cache.go
index ebaabc9..f580f42 100644
--- a/cache.go
+++ b/cache/cache.go
@@ -1,10 +1,8 @@
-package main
+package cache
 
 import (
 	"fmt"
-	"time"
 
-	"crypto/md5"
 	"github.com/miekg/dns"
 )
 
@@ -39,23 +37,11 @@ func (e SerializerError) Error() string {
 	return fmt.Sprintf("Serializer error: got %v", e.err)
 }
 
-type Mesg struct {
-	Msg    *dns.Msg
-	Expire time.Time
-}
-
 type Cache interface {
 	Get(key string) (Msg *dns.Msg, err error)
 	Set(key string, Msg *dns.Msg) error
 	Exists(key string) bool
 	Remove(key string) error
 	Full() bool
-}
-
-func KeyGen(q Question) string {
-	h := md5.New()
-	h.Write([]byte(q.String()))
-	x := h.Sum(nil)
-	key := fmt.Sprintf("%x", x)
-	return key
+	Purge() error
 }
\ No newline at end of file
diff --git a/cache_memcached.go b/cache/cache_memcached.go
similarity index 93%
rename from cache_memcached.go
rename to cache/cache_memcached.go
index a30f829..5b7b55a 100644
--- a/cache_memcached.go
+++ b/cache/cache_memcached.go
@@ -1,4 +1,4 @@
-package main
+package cache
 
 import (
 	"github.com/bradfitz/gomemcache/memcache"
@@ -64,3 +64,7 @@ func (m *MemcachedCache) Full() bool {
 	// memcache is never full (LRU)
 	return false
 }
+
+func (m *MemcachedCache) Purge() error {
+	return m.backend.DeleteAll()
+}
diff --git a/cache_memory.go b/cache/cache_memory.go
similarity index 64%
rename from cache_memory.go
rename to cache/cache_memory.go
index 5e57f21..d4b839a 100644
--- a/cache_memory.go
+++ b/cache/cache_memory.go
@@ -1,4 +1,4 @@
-package main
+package cache
 
 import (
 	"github.com/miekg/dns"
@@ -6,18 +6,35 @@ import (
 	"time"
 )
 
+func NewMemoryCache(expire time.Duration, maxCount int) *MemoryCache {
+	return &MemoryCache{
+		backend:  make(map[string]Mesg),
+		Expire:   expire,
+		Maxcount: maxCount,
+	}
+}
+
+type Mesg struct {
+	Msg    *dns.Msg
+	Expire time.Time
+}
+
 type MemoryCache struct {
 	Cache
 
-	Backend  map[string]Mesg
+	backend  map[string]Mesg
 	Expire   time.Duration
 	Maxcount int
 	mu       sync.RWMutex
 }
 
+func (c *MemoryCache) initialize() {
+	c.backend = make(map[string]Mesg)
+}
+
 func (c *MemoryCache) Get(key string) (*dns.Msg, error) {
 	c.mu.RLock()
-	mesg, ok := c.Backend[key]
+	mesg, ok := c.backend[key]
 	c.mu.RUnlock()
 	if !ok {
 		return nil, KeyNotFound{key}
@@ -40,21 +57,21 @@ func (c *MemoryCache) Set(key string, msg *dns.Msg) error {
 	expire := time.Now().Add(c.Expire)
 	mesg := Mesg{msg, expire}
 	c.mu.Lock()
-	c.Backend[key] = mesg
+	c.backend[key] = mesg
 	c.mu.Unlock()
 	return nil
 }
 
 func (c *MemoryCache) Remove(key string) error {
 	c.mu.Lock()
-	delete(c.Backend, key)
+	delete(c.backend, key)
 	c.mu.Unlock()
 	return nil
 }
 
 func (c *MemoryCache) Exists(key string) bool {
 	c.mu.RLock()
-	_, ok := c.Backend[key]
+	_, ok := c.backend[key]
 	c.mu.RUnlock()
 	return ok
 }
@@ -62,7 +79,7 @@ func (c *MemoryCache) Exists(key string) bool {
 func (c *MemoryCache) Length() int {
 	c.mu.RLock()
 	defer c.mu.RUnlock()
-	return len(c.Backend)
+	return len(c.backend)
 }
 
 func (c *MemoryCache) Full() bool {
@@ -72,3 +89,12 @@ func (c *MemoryCache) Full() bool {
 	}
 	return c.Length() >= c.Maxcount
 }
+
+func (c *MemoryCache) Purge() error {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+
+	c.initialize()
+
+	return nil
+}
\ No newline at end of file
diff --git a/cache_redis.go b/cache/cache_redis.go
similarity index 53%
rename from cache_redis.go
rename to cache/cache_redis.go
index eb42267..b3eb57a 100644
--- a/cache_redis.go
+++ b/cache/cache_redis.go
@@ -1,12 +1,14 @@
-package main
+package cache
 
 import (
-	"github.com/hoisie/redis"
+	"github.com/go-redis/redis/v7"
 	"github.com/miekg/dns"
+	"meow.tf/joker/godns/settings"
+	"time"
 )
 
-func NewRedisCache(c RedisSettings, expire int32) *RedisCache {
-	rc := &redis.Client{Addr: c.Addr(), Db: c.DB, Password: c.Password}
+func NewRedisCache(c settings.RedisSettings, expire int32) *RedisCache {
+	rc := redis.NewClient(&redis.Options{Addr: c.Addr(), DB: c.DB, Password: c.Password})
 
 	return &RedisCache{
 		backend: rc,
@@ -25,6 +27,8 @@ func (m *RedisCache) Set(key string, msg *dns.Msg) error {
 	var val []byte
 	var err error
 
+	key = "cache:" + key
+
 	// handle cases for negacache where it sets nil values
 	if msg == nil {
 		val = []byte("nil")
@@ -34,16 +38,21 @@ func (m *RedisCache) Set(key string, msg *dns.Msg) error {
 	if err != nil {
 		err = SerializerError{err}
 	}
-	return m.backend.Setex(key, int64(m.expire), val)
+	return m.backend.Set(key, val, time.Duration(m.expire) * time.Second).Err()
 }
 
 func (m *RedisCache) Get(key string) (*dns.Msg, error) {
 	var msg dns.Msg
-	item, err := m.backend.Get(key)
+	var err error
+	key = "cache:" + key
+
+	item, err := m.backend.Get(key).Bytes()
+
 	if err != nil {
 		err = KeyNotFound{key}
 		return &msg, err
 	}
+
 	err = msg.Unpack(item)
 	if err != nil {
 		err = SerializerError{err}
@@ -52,19 +61,40 @@ func (m *RedisCache) Get(key string) (*dns.Msg, error) {
 }
 
 func (m *RedisCache) Exists(key string) bool {
-	exists, err := m.backend.Exists(key)
+	res, err := m.backend.Exists(key).Result()
+
 	if err != nil {
 		return true
 	}
-	return exists
+
+	return res == 1
 }
 
 func (m *RedisCache) Remove(key string) error {
-	_, err := m.backend.Del(key)
-	return err
+	return m.backend.Del(key).Err()
 }
 
 func (m *RedisCache) Full() bool {
 	// redis is never full (LRU)
 	return false
 }
+
+func (m *RedisCache) Purge() error {
+	iter := m.backend.Scan(0, "cache:*", 0).Iterator()
+
+	if iter.Err() != nil {
+		return iter.Err()
+	}
+
+	var err error
+
+	for iter.Next() {
+		err = m.backend.Del(iter.Val()).Err()
+
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
\ No newline at end of file
diff --git a/etc/godns.conf b/etc/godns.conf
index 41ce675..d75abea 100644
--- a/etc/godns.conf
+++ b/etc/godns.conf
@@ -9,7 +9,7 @@ Debug = false
 
 [server]
 host = "0.0.0.0"
-port = 53
+nets = ["tcp:53", "udp:53"]
 
 [resolv]
 # Domain-specific nameservers configuration, formatting keep compatible with Dnsmasq
diff --git a/go.mod b/go.mod
index 583846b..748461d 100644
--- a/go.mod
+++ b/go.mod
@@ -1,4 +1,4 @@
-module godns
+module meow.tf/joker/godns
 
 go 1.12
 
@@ -7,18 +7,19 @@ require (
 	github.com/bradfitz/gomemcache v0.0.0-20190913173617-a41fca850d0b
 	github.com/caarlos0/env v3.5.0+incompatible
 	github.com/fsnotify/fsnotify v1.4.7
+	github.com/go-redis/redis/v7 v7.0.0-beta.5
 	github.com/gopherjs/gopherjs v0.0.0-20190915194858-d3ddacdb130f // indirect
 	github.com/hoisie/redis v0.0.0-20160730154456-b5c6e81454e0
-	github.com/miekg/dns v1.1.18
+	github.com/kr/pretty v0.2.0 // indirect
+	github.com/miekg/dns v1.1.27
+	github.com/mitchellh/go-homedir v1.1.0
 	github.com/ryanuber/go-glob v1.0.0
 	github.com/smartystreets/assertions v1.0.1 // indirect
-	github.com/smartystreets/goconvey v0.0.0-20190731233626-505e41936337
-	github.com/stretchr/objx v0.2.0 // indirect
+	github.com/smartystreets/goconvey v1.6.4
+	github.com/spf13/viper v1.6.2
 	github.com/stretchr/testify v1.4.0 // indirect
-	golang.org/x/crypto v0.0.0-20190923035154-9ee001bba392 // indirect
-	golang.org/x/net v0.0.0-20190926025831-c00fd9afed17 // indirect
+	golang.org/x/crypto v0.0.0-20200117160349-530e935923ad // indirect
+	golang.org/x/net v0.0.0-20200114155413-6afb5195e5aa // indirect
 	golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e // indirect
-	golang.org/x/sys v0.0.0-20190924154521-2837fb4f24fe // indirect
-	golang.org/x/tools v0.0.0-20190925230517-ea99b82c7b93 // indirect
-	gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 // indirect
+	golang.org/x/sys v0.0.0-20200124204421-9fbb57f87de9 // indirect
 )
diff --git a/handler.go b/handler.go
index cf97b4c..7f72983 100644
--- a/handler.go
+++ b/handler.go
@@ -1,6 +1,14 @@
 package main
 
 import (
+	"crypto/md5"
+	"fmt"
+	"meow.tf/joker/godns/cache"
+	"meow.tf/joker/godns/hosts"
+	"meow.tf/joker/godns/log"
+	"meow.tf/joker/godns/resolver"
+	"meow.tf/joker/godns/settings"
+	"meow.tf/joker/godns/utils"
 	"net"
 	"time"
 
@@ -13,75 +21,56 @@ const (
 	_IP6Query  = 6
 )
 
-type Question struct {
-	qname  string
-	qtype  string
-	qclass string
-}
-
-func (q *Question) String() string {
-	return q.qname + " " + q.qclass + " " + q.qtype
-}
-
 type GODNSHandler struct {
-	resolver        *Resolver
-	cache, negCache Cache
-	hosts           Hosts
+	resolver        *resolver.Resolver
+	cache, negCache cache.Cache
+	hosts           hosts.Hosts
 }
 
 func NewHandler() *GODNSHandler {
 
 	var (
-		cacheConfig     CacheSettings
-		resolver        *Resolver
-		cache, negCache Cache
+		cacheConfig             settings.CacheSettings
+		r                       *resolver.Resolver
+		resolverCache, negCache cache.Cache
 	)
 
-	resolver = NewResolver(settings.ResolvConfig)
+	r = resolver.NewResolver(settings.Resolver())
 
-	cacheConfig = settings.Cache
+	cacheConfig = settings.Cache()
 	switch cacheConfig.Backend {
 	case "memory":
-		cache = &MemoryCache{
-			Backend:  make(map[string]Mesg, cacheConfig.Maxcount),
-			Expire:   time.Duration(cacheConfig.Expire) * time.Second,
-			Maxcount: cacheConfig.Maxcount,
-		}
-		negCache = &MemoryCache{
-			Backend:  make(map[string]Mesg),
-			Expire:   time.Duration(cacheConfig.Expire) * time.Second / 2,
-			Maxcount: cacheConfig.Maxcount,
-		}
+		cacheDuration := time.Duration(cacheConfig.Expire) * time.Second
+
+		negCache = cache.NewMemoryCache(cacheDuration/2, cacheConfig.Maxcount)
+		resolverCache = cache.NewMemoryCache(time.Duration(cacheConfig.Expire)*time.Second, cacheConfig.Maxcount)
 	case "memcache":
-		cache = NewMemcachedCache(
-			settings.Memcache.Servers,
+		resolverCache = cache.NewMemcachedCache(
+			settings.Memcache().Servers,
 			int32(cacheConfig.Expire))
-		negCache = NewMemcachedCache(
-			settings.Memcache.Servers,
+		negCache = cache.NewMemcachedCache(
+			settings.Memcache().Servers,
 			int32(cacheConfig.Expire/2))
 	case "redis":
-		cache = NewRedisCache(
-			settings.Redis,
+		resolverCache = cache.NewRedisCache(
+			settings.Redis(),
 			int32(cacheConfig.Expire))
-		negCache = NewRedisCache(
-			settings.Redis,
+		negCache = cache.NewRedisCache(
+			settings.Redis(),
 			int32(cacheConfig.Expire/2))
 	default:
-		logger.Error("Invalid cache backend %s", cacheConfig.Backend)
+		log.Error("Invalid cache backend %s", cacheConfig.Backend)
 		panic("Invalid cache backend")
 	}
 
-	var hosts Hosts
-	if settings.Hosts.Enable {
-		hosts = NewHosts(settings.Hosts, settings.Redis)
-	}
+	h := hosts.NewHosts(settings.Hosts(), settings.Redis())
 
-	return &GODNSHandler{resolver, cache, negCache, hosts}
+	return &GODNSHandler{r, resolverCache, negCache, h}
 }
 
 func (h *GODNSHandler) do(Net string, w dns.ResponseWriter, req *dns.Msg) {
 	q := req.Question[0]
-	Q := Question{UnFqdn(q.Name), dns.TypeToString[q.Qtype], dns.ClassToString[q.Qclass]}
+	question := resolver.Question{Name: utils.UnFqdn(q.Name), Type: dns.TypeToString[q.Qtype], Class: dns.ClassToString[q.Qclass]}
 
 	var remote net.IP
 	if Net == "tcp" {
@@ -89,63 +78,61 @@ func (h *GODNSHandler) do(Net string, w dns.ResponseWriter, req *dns.Msg) {
 	} else {
 		remote = w.RemoteAddr().(*net.UDPAddr).IP
 	}
-	logger.Info("%s lookup　%s", remote, Q.String())
+	log.Info("%s lookup　%s", remote, question.String())
 
 	IPQuery := h.isIPQuery(q)
 
 	// Query hosts
-	if settings.Hosts.Enable && IPQuery > 0 {
-		if ips, ok := h.hosts.Get(Q.qname, IPQuery); ok {
+	if h.hosts != nil && IPQuery > 0 {
+		if ips, ok := h.hosts.Get(question.Name, IPQuery); ok {
 			m := new(dns.Msg)
 			m.SetReply(req)
 
 			switch IPQuery {
 			case _IP4Query:
-				rr_header := dns.RR_Header{
+				hdr := dns.RR_Header{
 					Name:   q.Name,
 					Rrtype: dns.TypeA,
 					Class:  dns.ClassINET,
-					Ttl:    settings.Hosts.TTL,
+					Ttl:    h.hosts.TTL(),
 				}
 				for _, ip := range ips {
-					a := &dns.A{rr_header, ip}
-					m.Answer = append(m.Answer, a)
+					m.Answer = append(m.Answer, &dns.A{Hdr: hdr, A: ip})
 				}
 			case _IP6Query:
-				rr_header := dns.RR_Header{
+				hdr := dns.RR_Header{
 					Name:   q.Name,
 					Rrtype: dns.TypeAAAA,
 					Class:  dns.ClassINET,
-					Ttl:    settings.Hosts.TTL,
+					Ttl:    h.hosts.TTL(),
 				}
 				for _, ip := range ips {
-					aaaa := &dns.AAAA{rr_header, ip}
-					m.Answer = append(m.Answer, aaaa)
+					m.Answer = append(m.Answer, &dns.AAAA{Hdr: hdr, AAAA: ip})
 				}
 			}
 
 			w.WriteMsg(m)
-			logger.Debug("%s found in hosts file", Q.qname)
+			log.Debug("%s found in hosts file", question.Name)
 			return
 		} else {
-			logger.Debug("%s didn't found in hosts file", Q.qname)
+			log.Debug("%s didn't found in hosts file", question.Name)
 		}
 	}
 
 	// Only query cache when qtype == 'A'|'AAAA' , qclass == 'IN'
-	key := KeyGen(Q)
+	key := KeyGen(question)
 	if IPQuery > 0 {
 		mesg, err := h.cache.Get(key)
 		if err != nil {
 			if mesg, err = h.negCache.Get(key); err != nil {
-				logger.Debug("%s didn't hit cache", Q.String())
+				log.Debug("%s didn't hit cache", question.String())
 			} else {
-				logger.Debug("%s hit negative cache", Q.String())
+				log.Debug("%s hit negative cache", question.String())
 				dns.HandleFailed(w, req)
 				return
 			}
 		} else {
-			logger.Debug("%s hit cache", Q.String())
+			log.Debug("%s hit cache", question.String())
 			// we need this copy against concurrent modification of Id
 			msg := *mesg
 			msg.Id = req.Id
@@ -157,12 +144,12 @@ func (h *GODNSHandler) do(Net string, w dns.ResponseWriter, req *dns.Msg) {
 	mesg, err := h.resolver.Lookup(Net, req)
 
 	if err != nil {
-		logger.Warn("Resolve query error %s", err)
+		log.Warn("Resolve query error %s", err)
 		dns.HandleFailed(w, req)
 
 		// cache the failure, too!
 		if err = h.negCache.Set(key, nil); err != nil {
-			logger.Warn("Set %s negative cache failed: %v", Q.String(), err)
+			log.Warn("Set %s negative cache failed: %v", question.String(), err)
 		}
 		return
 	}
@@ -172,18 +159,16 @@ func (h *GODNSHandler) do(Net string, w dns.ResponseWriter, req *dns.Msg) {
 	if IPQuery > 0 && len(mesg.Answer) > 0 {
 		err = h.cache.Set(key, mesg)
 		if err != nil {
-			logger.Warn("Set %s cache failed: %s", Q.String(), err.Error())
+			log.Warn("Set %s cache failed: %s", question.String(), err.Error())
 		}
-		logger.Debug("Insert %s into cache", Q.String())
+		log.Debug("Insert %s into cache", question.String())
 	}
 }
 
-func (h *GODNSHandler) DoTCP(w dns.ResponseWriter, req *dns.Msg) {
-	h.do("tcp", w, req)
-}
-
-func (h *GODNSHandler) DoUDP(w dns.ResponseWriter, req *dns.Msg) {
-	h.do("udp", w, req)
+func (h *GODNSHandler) Bind(net string) func(w dns.ResponseWriter, req *dns.Msg) {
+	return func(w dns.ResponseWriter, req *dns.Msg) {
+		h.do(net, w, req)
+	}
 }
 
 func (h *GODNSHandler) isIPQuery(q dns.Question) int {
@@ -201,9 +186,10 @@ func (h *GODNSHandler) isIPQuery(q dns.Question) int {
 	}
 }
 
-func UnFqdn(s string) string {
-	if dns.IsFqdn(s) {
-		return s[:len(s)-1]
-	}
-	return s
+func KeyGen(q resolver.Question) string {
+	h := md5.New()
+	h.Write([]byte(q.String()))
+	x := h.Sum(nil)
+	key := fmt.Sprintf("%x", x)
+	return key
 }
diff --git a/hosts.go b/hosts/hosts.go
similarity index 65%
rename from hosts.go
rename to hosts/hosts.go
index 657cda7..748232d 100644
--- a/hosts.go
+++ b/hosts/hosts.go
@@ -1,13 +1,27 @@
-package main
+package hosts
 
 import (
+	"meow.tf/joker/godns/log"
+	"meow.tf/joker/godns/settings"
 	"net"
 	"time"
 
 	"github.com/hoisie/redis"
 )
 
-type Hosts struct {
+const (
+	notIPQuery = 0
+	_IP4Query  = 4
+	_IP6Query  = 6
+)
+
+type Hosts interface {
+	Get(domain string, family int) ([]net.IP, bool)
+	TTL() uint32
+}
+
+type ProviderList struct {
+	settings settings.HostsSettings
 	providers       []HostProvider
 	refreshInterval time.Duration
 }
@@ -17,20 +31,20 @@ type HostProvider interface {
 	Refresh()
 }
 
-func NewHosts(hs HostsSettings, rs RedisSettings) Hosts {
+func NewHosts(hs settings.HostsSettings, rs settings.RedisSettings) Hosts {
 	providers := []HostProvider{
 		NewFileProvider(hs.HostsFile),
 	}
 
 	if hs.RedisEnable {
-		logger.Info("Redis is enabled: %s", rs.Addr())
+		log.Info("Redis is enabled: %s", rs.Addr())
 
 		rc := &redis.Client{Addr: rs.Addr(), Db: rs.DB, Password: rs.Password}
 
 		providers = append(providers, NewRedisProvider(rc, hs.RedisKey))
 	}
 
-	h := Hosts{providers, time.Second * time.Duration(hs.RefreshInterval)}
+	h := &ProviderList{hs, providers, time.Second * time.Duration(hs.RefreshInterval)}
 
 	if h.refreshInterval > 0 {
 		h.refresh()
@@ -39,7 +53,7 @@ func NewHosts(hs HostsSettings, rs RedisSettings) Hosts {
 	return h
 }
 
-func (h *Hosts) refresh() {
+func (h *ProviderList) refresh() {
 	ticker := time.NewTicker(h.refreshInterval)
 
 	go func() {
@@ -57,7 +71,7 @@ func (h *Hosts) refresh() {
 /*
 Match local /etc/hosts file first, remote redis records second
 */
-func (h *Hosts) Get(domain string, family int) ([]net.IP, bool) {
+func (h *ProviderList) Get(domain string, family int) ([]net.IP, bool) {
 	var sips []string
 	var ok bool
 	var ip net.IP
@@ -91,3 +105,7 @@ func (h *Hosts) Get(domain string, family int) ([]net.IP, bool) {
 
 	return ips, ips != nil
 }
+
+func (h *ProviderList) TTL() uint32 {
+	return h.settings.TTL
+}
\ No newline at end of file
diff --git a/hosts_file.go b/hosts/hosts_file.go
similarity index 90%
rename from hosts_file.go
rename to hosts/hosts_file.go
index b1b1af8..65109b9 100644
--- a/hosts_file.go
+++ b/hosts/hosts_file.go
@@ -1,9 +1,10 @@
-package main
+package hosts
 
 import (
 	"bufio"
 	"github.com/fsnotify/fsnotify"
 	"github.com/ryanuber/go-glob"
+	"meow.tf/joker/godns/log"
 	"os"
 	"regexp"
 	"strings"
@@ -45,7 +46,7 @@ func NewFileProvider(file string) HostProvider {
 }
 
 func (f *FileHosts) Get(domain string) ([]string, bool) {
-	logger.Debug("Checking file provider for %s", domain)
+	log.Debug("Checking file provider for %s", domain)
 
 	f.mu.RLock()
 	defer f.mu.RUnlock()
@@ -80,7 +81,7 @@ func (f *FileHosts) Refresh() {
 	buf, err := os.Open(f.file)
 
 	if err != nil {
-		logger.Warn("Update hosts records from file failed %s", err)
+		log.Warn("Update hosts records from file failed %s", err)
 		return
 	}
 
@@ -127,7 +128,7 @@ func (f *FileHosts) Refresh() {
 			f.hosts[strings.ToLower(domain)] = ip
 		}
 	}
-	logger.Debug("update hosts records from %s, total %d records.", f.file, len(f.hosts))
+	log.Debug("update hosts records from %s, total %d records.", f.file, len(f.hosts))
 }
 
 func (f *FileHosts) clear() {
diff --git a/hosts_redis.go b/hosts/hosts_redis.go
similarity index 81%
rename from hosts_redis.go
rename to hosts/hosts_redis.go
index 760aa26..be86a45 100644
--- a/hosts_redis.go
+++ b/hosts/hosts_redis.go
@@ -1,8 +1,9 @@
-package main
+package hosts
 
 import (
 	"github.com/hoisie/redis"
 	"github.com/ryanuber/go-glob"
+	"meow.tf/joker/godns/log"
 	"strings"
 	"sync"
 )
@@ -41,7 +42,7 @@ func NewRedisProvider(rc *redis.Client, key string) HostProvider {
 			msg := <-messages
 
 			if msg.Channel == "godns:update" {
-				logger.Debug("Refreshing redis records due to update")
+				log.Debug("Refreshing redis records due to update")
 				rh.Refresh()
 			} else if msg.Channel == "godns:update_record" {
 				recordName := string(msg.Message)
@@ -49,17 +50,17 @@ func NewRedisProvider(rc *redis.Client, key string) HostProvider {
 				b, err := rc.Hget(key, recordName)
 
 				if err != nil {
-					logger.Warn("Record %s does not exist, but was updated", recordName)
+					log.Warn("Record %s does not exist, but was updated", recordName)
 					continue
 				}
 
-				logger.Debug("Record %s was updated to %s", recordName, string(b))
+				log.Debug("Record %s was updated to %s", recordName, string(b))
 
 				rh.mu.Lock()
 				rh.hosts[recordName] = string(b)
 				rh.mu.Unlock()
 			} else if msg.Channel == "godns:remove_record" {
-				logger.Debug("Record %s was removed", msg.Message)
+				log.Debug("Record %s was removed", msg.Message)
 
 				recordName := string(msg.Message)
 
@@ -67,7 +68,7 @@ func NewRedisProvider(rc *redis.Client, key string) HostProvider {
 				delete(rh.hosts, recordName)
 				rh.mu.Unlock()
 			} else if msg.Channel == keyspaceEvent {
-				logger.Debug("Refreshing redis records due to update")
+				log.Debug("Refreshing redis records due to update")
 				rh.Refresh()
 			}
 		}
@@ -77,7 +78,7 @@ func NewRedisProvider(rc *redis.Client, key string) HostProvider {
 }
 
 func (r *RedisHosts) Get(domain string) ([]string, bool) {
-	logger.Debug("Checking redis provider for %s", domain)
+	log.Debug("Checking redis provider for %s", domain)
 
 	r.mu.RLock()
 	defer r.mu.RUnlock()
@@ -117,9 +118,9 @@ func (r *RedisHosts) Refresh() {
 	r.clear()
 	err := r.redis.Hgetall(r.key, r.hosts)
 	if err != nil {
-		logger.Warn("Update hosts records from redis failed %s", err)
+		log.Warn("Update hosts records from redis failed %s", err)
 	} else {
-		logger.Debug("Update hosts records from redis")
+		log.Debug("Update hosts records from redis")
 	}
 }
 
diff --git a/log.go b/log/log.go
similarity index 98%
rename from log.go
rename to log/log.go
index a355bf9..4a8cd0d 100644
--- a/log.go
+++ b/log/log.go
@@ -1,4 +1,4 @@
-package main
+package log
 
 import (
 	"fmt"
@@ -16,6 +16,10 @@ const (
 	LevelError
 )
 
+var (
+	logger *GoDNSLogger
+)
+
 type logMesg struct {
 	Level int
 	Mesg  string
diff --git a/log_test.go b/log/log_test.go
similarity index 98%
rename from log_test.go
rename to log/log_test.go
index ca7eb26..79662c1 100644
--- a/log_test.go
+++ b/log/log_test.go
@@ -1,4 +1,4 @@
-package main
+package log
 
 import (
 	"bufio"
diff --git a/log/logger.go b/log/logger.go
new file mode 100644
index 0000000..21eae12
--- /dev/null
+++ b/log/logger.go
@@ -0,0 +1,33 @@
+package log
+
+func init() {
+	logger = NewLogger()
+}
+
+func Debug(format string, v ...interface{}) {
+	logger.Debug(format, v...)
+}
+
+func Info(format string, v ...interface{}) {
+	logger.Info(format, v...)
+}
+
+func Notice(format string, v ...interface{}) {
+	logger.Notice(format, v...)
+}
+
+func Warn(format string, v ...interface{}) {
+	logger.Warn(format, v...)
+}
+
+func Error(format string, v ...interface{}) {
+	logger.Error(format, v...)
+}
+
+func SetLogger(handlerType string, config map[string]interface{}) {
+	logger.SetLogger(handlerType, config)
+}
+
+func SetLevel(level int) {
+	logger.SetLevel(level)
+}
\ No newline at end of file
diff --git a/main.go b/main.go
index 2fbef68..a64e63c 100644
--- a/main.go
+++ b/main.go
@@ -1,6 +1,11 @@
 package main
 
 import (
+	"flag"
+	"fmt"
+	"github.com/spf13/viper"
+	"meow.tf/joker/godns/log"
+	"meow.tf/joker/godns/settings"
 	"os"
 	"os/signal"
 	"runtime"
@@ -8,26 +13,43 @@ import (
 	"time"
 )
 
-var (
-	logger *GoDNSLogger
+const (
+	Version = "0.3.0"
 )
 
-func main() {
+var (
+	cfgFile string
+)
 
+func init() {
+	flag.StringVar(&cfgFile, "config", "/etc/godns/godns.conf", "")
+}
+
+func main() {
 	initLogger()
 
+	viper.SetConfigFile(cfgFile)
+
+	viper.AutomaticEnv()
+
+	if err := viper.ReadInConfig(); err == nil {
+		fmt.Println("Using config file:", viper.ConfigFileUsed())
+	}
+
+	serverSettings := settings.Server()
+
 	server := &Server{
-		host:     settings.Server.Host,
-		port:     settings.Server.Port,
+		host:     serverSettings.Host,
+		port:     serverSettings.Port,
 		rTimeout: 5 * time.Second,
 		wTimeout: 5 * time.Second,
 	}
 
 	server.Run()
 
-	logger.Info("godns %s start", settings.Version)
+	log.Info("godns %s (%s) start", Version, runtime.Version())
 
-	if settings.Debug {
+	if settings.Debug() {
 		go profileCPU()
 		go profileMEM()
 	}
@@ -35,21 +57,15 @@ func main() {
 	sig := make(chan os.Signal)
 	signal.Notify(sig, os.Interrupt)
 
-forever:
-	for {
-		select {
-		case <-sig:
-			logger.Info("signal received, stopping")
-			break forever
-		}
-	}
 
+	<- sig
+	log.Info("signal received, stopping")
 }
 
 func profileCPU() {
 	f, err := os.Create("godns.cprof")
 	if err != nil {
-		logger.Error("%s", err)
+		log.Error("%s", err)
 		return
 	}
 
@@ -63,8 +79,9 @@ func profileCPU() {
 
 func profileMEM() {
 	f, err := os.Create("godns.mprof")
+
 	if err != nil {
-		logger.Error("%s", err)
+		log.Error("%s", err)
 		return
 	}
 
@@ -76,18 +93,17 @@ func profileMEM() {
 }
 
 func initLogger() {
-	logger = NewLogger()
+	logSettings := settings.Log()
 
-	if settings.Log.Stdout {
-		logger.SetLogger("console", nil)
+	if viper.GetBool("log.stdout") {
+		log.SetLogger("console", nil)
 	}
 
-	if settings.Log.File != "" {
-		config := map[string]interface{}{"file": settings.Log.File}
-		logger.SetLogger("file", config)
+	if file := viper.GetString("log.file"); file != "" {
+		log.SetLogger("file", map[string]interface{}{"file": file})
 	}
 
-	logger.SetLevel(settings.Log.LogLevel())
+	log.SetLevel(logSettings.LogLevel())
 }
 
 func init() {
diff --git a/resolver/nameserver.go b/resolver/nameserver.go
new file mode 100644
index 0000000..3b5d73a
--- /dev/null
+++ b/resolver/nameserver.go
@@ -0,0 +1,5 @@
+package resolver
+
+type Nameserver struct {
+	address string
+}
diff --git a/resolver/question.go b/resolver/question.go
new file mode 100644
index 0000000..ecab487
--- /dev/null
+++ b/resolver/question.go
@@ -0,0 +1,11 @@
+package resolver
+
+type Question struct {
+	Name  string
+	Type  string
+	Class string
+}
+
+func (q *Question) String() string {
+	return q.Name + " " + q.Class + " " + q.Type
+}
diff --git a/resolver.go b/resolver/resolver.go
similarity index 71%
rename from resolver.go
rename to resolver/resolver.go
index 39931e0..5c7c0c3 100644
--- a/resolver.go
+++ b/resolver/resolver.go
@@ -1,9 +1,12 @@
-package main
+package resolver
 
 import (
 	"bufio"
+	"errors"
 	"fmt"
-	"log"
+	"meow.tf/joker/godns/log"
+	"meow.tf/joker/godns/settings"
+	"meow.tf/joker/godns/utils"
 	"net"
 	"os"
 	"strconv"
@@ -11,9 +14,8 @@ import (
 	"sync"
 	"time"
 
-	"github.com/miekg/dns"
-	"errors"
 	"crypto/tls"
+	"github.com/miekg/dns"
 )
 
 type ResolvError struct {
@@ -35,14 +37,13 @@ type RResp struct {
 type Resolver struct {
 	servers       []string
 	domain_server *suffixTreeNode
-	config        *ResolvSettings
+	config        *settings.ResolvSettings
 
-	tcpClient   *dns.Client
-	udpClient   *dns.Client
-	httpsClient *dns.Client
+	clients map[string]*dns.Client
+	clientLock sync.RWMutex
 }
 
-func NewResolver(c ResolvSettings) *Resolver {
+func NewResolver(c settings.ResolvSettings) *Resolver {
 	r := &Resolver{
 		servers:       []string{},
 		domain_server: newSuffixTreeRoot(),
@@ -51,16 +52,14 @@ func NewResolver(c ResolvSettings) *Resolver {
 
 	if len(c.ServerListFile) > 0 {
 		r.ReadServerListFile(c.ServerListFile)
-
-		log.Println("Read servers", strings.Join(r.servers, ", "))
 	}
 
 	if len(c.ResolvFile) > 0 {
 		clientConfig, err := dns.ClientConfigFromFile(c.ResolvFile)
 
 		if err != nil {
-			logger.Error(":%s is not a valid resolv.conf file\n", c.ResolvFile)
-			logger.Error("%s", err)
+			log.Error(":%s is not a valid resolv.conf file\n", c.ResolvFile)
+			log.Error("%s", err)
 			panic(err)
 		}
 
@@ -73,26 +72,6 @@ func NewResolver(c ResolvSettings) *Resolver {
 		r.servers = append([]string{c.DOHServer}, r.servers...)
 	}
 
-	timeout := r.Timeout()
-
-	r.udpClient = &dns.Client{
-		Net:          "udp",
-		ReadTimeout:  timeout,
-		WriteTimeout: timeout,
-	}
-
-	r.tcpClient = &dns.Client{
-		Net:          "tcp",
-		ReadTimeout:  timeout,
-		WriteTimeout: timeout,
-	}
-
-	r.httpsClient = &dns.Client{
-		Net:          "https",
-		ReadTimeout:  timeout,
-		WriteTimeout: timeout,
-	}
-
 	return r
 }
 
@@ -128,7 +107,7 @@ func (r *Resolver) parseServerListFile(buf *os.File) {
 			domain := tokens[1]
 			ip := tokens[2]
 
-			if !isDomain(domain) || !isIP(ip) {
+			if !utils.IsDomain(domain) || !utils.IsIP(ip) {
 				continue
 			}
 
@@ -142,7 +121,7 @@ func (r *Resolver) parseServerListFile(buf *os.File) {
 
 			ip := ""
 
-			if ip = srv_port[0]; !isIP(ip) {
+			if ip = srv_port[0]; !utils.IsIP(ip) {
 				continue
 			}
 
@@ -169,8 +148,8 @@ func (r *Resolver) ReadServerListFile(path string) {
 		if err != nil {
 			panic("Can't open " + file)
 		}
-		defer buf.Close()
 		r.parseServerListFile(buf)
+		buf.Close()
 	}
 }
 
@@ -178,7 +157,7 @@ func (r *Resolver) ReadServerListFile(path string) {
 // in every second, and return as early as possbile (have an answer).
 // It returns an error if no request has succeeded.
 func (r *Resolver) Lookup(net string, req *dns.Msg) (message *dns.Msg, err error) {
-	if net == "udp" && settings.ResolvConfig.SetEDNS0 {
+	if net == "udp" && r.config.SetEDNS0 {
 		req = req.SetEdns0(65535, true)
 	}
 
@@ -192,15 +171,15 @@ func (r *Resolver) Lookup(net string, req *dns.Msg) (message *dns.Msg, err error
 		c, err := resolver.resolverFor(net, nameserver)
 
 		if err != nil {
-			logger.Warn("error:%s", err.Error())
+			log.Warn("error:%s", err.Error())
 			return
 		}
 
 		r, rtt, err := c.Exchange(req, nameserver)
 
 		if err != nil {
-			logger.Warn("%s socket error on %s", qname, nameserver)
-			logger.Warn("error:%s", err.Error())
+			log.Warn("%s socket error on %s", qname, nameserver)
+			log.Warn("error:%s", err.Error())
 			return
 		}
 		// If SERVFAIL happen, should return immediately and try another upstream resolver.
@@ -208,7 +187,7 @@ func (r *Resolver) Lookup(net string, req *dns.Msg) (message *dns.Msg, err error
 		// that it has been verified no such domain existas and ask other resolvers
 		// would make no sense. See more about #20
 		if r != nil && r.Rcode != dns.RcodeSuccess {
-			logger.Warn("%s failed to get an valid answer on %s", qname, nameserver)
+			log.Warn("%s failed to get an valid answer on %s", qname, nameserver)
 			if r.Rcode == dns.RcodeServerFailure {
 				return
 			}
@@ -220,7 +199,7 @@ func (r *Resolver) Lookup(net string, req *dns.Msg) (message *dns.Msg, err error
 		}
 	}
 
-	ticker := time.NewTicker(time.Duration(settings.ResolvConfig.Interval) * time.Millisecond)
+	ticker := time.NewTicker(time.Duration(r.config.Interval) * time.Millisecond)
 	defer ticker.Stop()
 	// Start lookup on each nameserver top-down, in every second
 	nameservers := r.Nameservers(qname)
@@ -230,7 +209,7 @@ func (r *Resolver) Lookup(net string, req *dns.Msg) (message *dns.Msg, err error
 		// but exit early, if we have an answer
 		select {
 		case re := <-res:
-			logger.Debug("%s resolv on %s rtt: %v", UnFqdn(qname), re.nameserver, re.rtt)
+			log.Debug("%s resolv on %s rtt: %v", utils.UnFqdn(qname), re.nameserver, re.rtt)
 			return re.msg, nil
 		case <-ticker.C:
 			continue
@@ -240,7 +219,7 @@ func (r *Resolver) Lookup(net string, req *dns.Msg) (message *dns.Msg, err error
 	wg.Wait()
 	select {
 	case re := <-res:
-		logger.Debug("%s resolv on %s rtt: %v", UnFqdn(qname), re.nameserver, re.rtt)
+		log.Debug("%s resolv on %s rtt: %v", utils.UnFqdn(qname), re.nameserver, re.rtt)
 		return re.msg, nil
 	default:
 		return nil, ResolvError{qname, net, nameservers}
@@ -248,25 +227,37 @@ func (r *Resolver) Lookup(net string, req *dns.Msg) (message *dns.Msg, err error
 }
 
 func (r *Resolver) resolverFor(net, nameserver string) (*dns.Client, error) {
-	if strings.HasPrefix(nameserver, "https") {
-		return r.httpsClient, nil
-	} else if strings.HasSuffix(nameserver, ":853") {
-		// TODO We need to set the server name so we can confirm the TLS connection. This may require a rewrite of storing nameservers.
-		return &dns.Client{
-			Net:          "tcp-tls",
-			ReadTimeout:  r.Timeout(),
-			WriteTimeout: r.Timeout(),
-			TLSConfig: &tls.Config{
-				ServerName: "",
-			},
-		}, nil
-	} else if net == "udp" {
-		return r.udpClient, nil
-	} else if net == "tcp" {
-		return r.tcpClient, nil
+	r.clientLock.RLock()
+	client, exists := r.clients[net]
+	r.clientLock.RUnlock()
+
+	if exists {
+		return client, nil
 	}
 
-	return nil, errors.New("no client for nameserver")
+	if net != "tcp" && net != "tcp-tls" && net != "https" && net != "udp" {
+		return nil, errors.New("unknown network type")
+	}
+
+	timeout := r.Timeout()
+
+	client = &dns.Client{
+		Net: net,
+		ReadTimeout: timeout,
+		WriteTimeout: timeout,
+	}
+
+	if strings.HasSuffix(nameserver, ":853") {
+		client.TLSConfig = &tls.Config{
+
+		}
+	}
+
+	r.clientLock.Lock()
+	r.clients[net] = client
+	r.clientLock.Lock()
+
+	return client, nil
 }
 
 // Namservers return the array of nameservers, with port number appended.
@@ -278,7 +269,7 @@ func (r *Resolver) Nameservers(qname string) []string {
 
 	ns := []string{}
 	if v, found := r.domain_server.search(queryKeys); found {
-		logger.Debug("%s be found in domain server list, upstream: %v", qname, v)
+		log.Debug("%s found in domain server list, upstream: %v", qname, v)
 
 		ns = append(ns, net.JoinHostPort(v, "53"))
 		//Ensure query the specific upstream nameserver in async Lookup() function.
diff --git a/sfx_tree.go b/resolver/sfx_tree.go
similarity index 98%
rename from sfx_tree.go
rename to resolver/sfx_tree.go
index bfaca0e..41e4cf8 100644
--- a/sfx_tree.go
+++ b/resolver/sfx_tree.go
@@ -1,4 +1,4 @@
-package main
+package resolver
 
 type suffixTreeNode struct {
 	key      string
diff --git a/sfx_tree_test.go b/resolver/sfx_tree_test.go
similarity index 98%
rename from sfx_tree_test.go
rename to resolver/sfx_tree_test.go
index b2f0ae1..9ff26b9 100644
--- a/sfx_tree_test.go
+++ b/resolver/sfx_tree_test.go
@@ -1,4 +1,4 @@
-package main
+package resolver
 
 import (
 	"strings"
diff --git a/server.go b/server.go
index 020ee48..a1109e4 100644
--- a/server.go
+++ b/server.go
@@ -1,8 +1,9 @@
 package main
 
 import (
-	"net"
-	"strconv"
+	"github.com/spf13/viper"
+	"meow.tf/joker/godns/log"
+	"strings"
 	"time"
 
 	"github.com/miekg/dns"
@@ -15,45 +16,49 @@ type Server struct {
 	wTimeout time.Duration
 }
 
-func (s *Server) Addr() string {
-	return net.JoinHostPort(s.host, strconv.Itoa(s.port))
-}
-
 func (s *Server) Run() {
 	handler := NewHandler()
 
-	tcpHandler := dns.NewServeMux()
-	tcpHandler.HandleFunc(".", handler.DoTCP)
+	nets := viper.GetStringSlice("networks")
 
-	udpHandler := dns.NewServeMux()
-	udpHandler.HandleFunc(".", handler.DoUDP)
+	var addr string
+	var split []string
 
-	tcpServer := &dns.Server{
-		Addr:         s.Addr(),
-		Net:          "tcp",
-		Handler:      tcpHandler,
-		ReadTimeout:  s.rTimeout,
-		WriteTimeout: s.wTimeout,
+	// Defaults: tcp, udp
+	for _, net := range nets {
+		split = strings.Split(net, ":")
+
+		net = split[0]
+
+		addr = s.host
+
+		if len(split) == 1 {
+			addr += ":53"
+		} else {
+			addr += ":" + split[1]
+		}
+
+		h := dns.NewServeMux()
+		h.HandleFunc(".", handler.Bind(net))
+
+		server := &dns.Server{
+			Addr: addr,
+			Net: net,
+			Handler: h,
+			ReadTimeout: s.rTimeout,
+			WriteTimeout: s.wTimeout,
+		}
+
+		go s.start(server)
 	}
-
-	udpServer := &dns.Server{
-		Addr:         s.Addr(),
-		Net:          "udp",
-		Handler:      udpHandler,
-		UDPSize:      65535,
-		ReadTimeout:  s.rTimeout,
-		WriteTimeout: s.wTimeout,
-	}
-
-	go s.start(udpServer)
-	go s.start(tcpServer)
 }
 
 func (s *Server) start(ds *dns.Server) {
-	logger.Info("Start %s listener on %s", ds.Net, s.Addr())
+	log.Info("Start %s listener on %s", ds.Net, ds.Addr)
 
 	err := ds.ListenAndServe()
+
 	if err != nil {
-		logger.Error("Start %s listener on %s failed:%s", ds.Net, s.Addr(), err.Error())
+		log.Error("Start %s listener on %s failed:%s", ds.Net, ds.Addr, err.Error())
 	}
 }
diff --git a/settings.go b/settings/settings.go
similarity index 82%
rename from settings.go
rename to settings/settings.go
index 96ca08c..bbd0201 100644
--- a/settings.go
+++ b/settings/settings.go
@@ -1,8 +1,9 @@
-package main
+package settings
 
 import (
 	"flag"
 	"fmt"
+	"meow.tf/joker/godns/log"
 	"os"
 	"strconv"
 
@@ -15,11 +16,20 @@ var (
 )
 
 var LogLevelMap = map[string]int{
-	"DEBUG":  LevelDebug,
-	"INFO":   LevelInfo,
-	"NOTICE": LevelNotice,
-	"WARN":   LevelWarn,
-	"ERROR":  LevelError,
+	"DEBUG":  log.LevelDebug,
+	"INFO":   log.LevelInfo,
+	"NOTICE": log.LevelNotice,
+	"WARN":   log.LevelWarn,
+	"ERROR":  log.LevelError,
+}
+
+type HostsSettings struct {
+	Enable          bool `toml:"enable" env:"HOSTS_ENABLE"`
+	HostsFile       string `toml:"host-file" env:"HOSTS_FILE"`
+	RedisEnable     bool   `toml:"redis-enable" env:"REDIS_HOSTS_ENABLE"`
+	RedisKey        string `toml:"redis-key" env:"REDIS_HOSTS_KEY"`
+	TTL             uint32 `toml:"ttl" env:"HOSTS_TTL"`
+	RefreshInterval uint32 `toml:"refresh-interval" env:"HOSTS_REFRESH_INTERVAL"`
 }
 
 type Settings struct {
@@ -83,15 +93,6 @@ type CacheSettings struct {
 	Maxcount int `toml:"maxcount" env:"CACHE_MAX_COUNT"`
 }
 
-type HostsSettings struct {
-	Enable          bool `toml:"enable" env:"HOSTS_ENABLE"`
-	HostsFile       string `toml:"host-file" env:"HOSTS_FILE"`
-	RedisEnable     bool   `toml:"redis-enable" env:"REDIS_HOSTS_ENABLE"`
-	RedisKey        string `toml:"redis-key" env:"REDIS_HOSTS_KEY"`
-	TTL             uint32 `toml:"ttl" env:"HOSTS_TTL"`
-	RefreshInterval uint32 `toml:"refresh-interval" env:"HOSTS_REFRESH_INTERVAL"`
-}
-
 func init() {
 	var configFile string
 
@@ -110,4 +111,36 @@ func init() {
 	env.Parse(&settings.Log)
 	env.Parse(&settings.Cache)
 	env.Parse(&settings.Hosts)
+}
+
+func Resolver() ResolvSettings {
+	return settings.ResolvConfig
+}
+
+func Cache() CacheSettings {
+	return settings.Cache
+}
+
+func Server() DNSServerSettings {
+	return settings.Server
+}
+
+func Hosts() HostsSettings {
+	return settings.Hosts
+}
+
+func Redis() RedisSettings {
+	return settings.Redis
+}
+
+func Memcache() MemcacheSettings {
+	return settings.Memcache
+}
+
+func Debug() bool {
+	return settings.Debug
+}
+
+func Log() LogSettings {
+	return settings.Log
 }
\ No newline at end of file
diff --git a/utils.go b/utils.go
deleted file mode 100644
index 9a19434..0000000
--- a/utils.go
+++ /dev/null
@@ -1,18 +0,0 @@
-package main
-
-import (
-	"net"
-	"regexp"
-)
-
-func isDomain(domain string) bool {
-	if isIP(domain) {
-		return false
-	}
-	match, _ := regexp.MatchString(`^([a-zA-Z0-9\*]([a-zA-Z0-9\-]{0,61}[a-zA-Z0-9])?\.)+[a-zA-Z]{2,6}$`, domain)
-	return match
-}
-
-func isIP(ip string) bool {
-	return net.ParseIP(ip) != nil
-}
diff --git a/utils/utils.go b/utils/utils.go
new file mode 100644
index 0000000..5a1c128
--- /dev/null
+++ b/utils/utils.go
@@ -0,0 +1,26 @@
+package utils
+
+import (
+	"github.com/miekg/dns"
+	"net"
+	"regexp"
+)
+
+func IsDomain(domain string) bool {
+	if IsIP(domain) {
+		return false
+	}
+	match, _ := regexp.MatchString(`^([a-zA-Z0-9\*]([a-zA-Z0-9\-]{0,61}[a-zA-Z0-9])?\.)+[a-zA-Z]{2,6}$`, domain)
+	return match
+}
+
+func IsIP(ip string) bool {
+	return net.ParseIP(ip) != nil
+}
+
+func UnFqdn(s string) string {
+	if dns.IsFqdn(s) {
+		return s[:len(s)-1]
+	}
+	return s
+}
\ No newline at end of file
diff --git a/utils_test.go b/utils/utils_test.go
similarity index 98%
rename from utils_test.go
rename to utils/utils_test.go
index 715b333..8a9dc5a 100644
--- a/utils_test.go
+++ b/utils/utils_test.go
@@ -1,4 +1,4 @@
-package main
+package utils
 
 import (
 	"testing"