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.gitignore vendored
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# Compiled Object files, Static and Dynamic libs (Shared Objects)
*.o
*.a
*.so
# Folders
_obj
_test
# Architecture specific extensions/prefixes
*.[568vq]
[568vq].out
*.cgo1.go
*.cgo2.c
_cgo_defun.c
_cgo_gotypes.go
_cgo_export.*
_testmain.go
*.exe
*.test
*.prof
*~ *~
dns* *.swp
gdns* gdns*
*.key
*.crt
client.yaml
server.yaml

675
LICENSE
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GNU GENERAL PUBLIC LICENSE
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{project} Copyright (C) {year} {fullname}
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<http://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<http://www.gnu.org/philosophy/why-not-lgpl.html>.

34
README.md
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@ -1,21 +1,27 @@
gdns # gdns
==== a dns proxy server write by go
gdns is a dns proxy server
Features
========
features support tcp, udp, tls, DoH(dns over https/http2)
Usage
======= =======
- support forward the query by rule, ```bash
different domains use different upstream server go get github.com/fangdingjun/gdns
- support ip black list cp $GOPATH/src/github.com/fangdingjun/gdns/config_example.yaml config.yaml
- support google https dns vim config.yaml
$GOPATH/bin/gdns -c config.yaml -log_level DEBUG
```
Third-part library
==================
use
[dns](https://github.com/miekg/dns)
library to parse the dns message
usage
=====
go get github.com/fangdingjun/gdns
cp $GOPATH/src/github.com/fangdingjun/gdns/config_example.yaml config.yaml
vim config.yaml
$GOPATH/bin/gdns -c config.yaml

19
cf_httpdns_test.go
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@ -1,19 +0,0 @@
package main
import (
"fmt"
"testing"
"github.com/miekg/dns"
)
func TestCFDns(t *testing.T) {
cf := &CloudflareHTTPDns{}
m := new(dns.Msg)
m.SetQuestion("www.google.com.", dns.TypeA)
m1, _, err := cf.Exchange(m, "1.1.1.1")
if err != nil {
t.Fatal(err)
}
fmt.Println(m1.String())
}

59
client_https.go
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@ -0,0 +1,59 @@
package main
import (
"bytes"
"context"
"fmt"
"io"
"net/http"
"time"
"github.com/miekg/dns"
)
type httpclient struct {
Net string
Timeout time.Duration
HTTPClient *http.Client
}
func (c *httpclient) Exchange(msg *dns.Msg, upstream string) (*dns.Msg, int, error) {
data, err := msg.Pack()
if err != nil {
return nil, 0, err
}
req, err := http.NewRequest("POST", upstream, bytes.NewReader(data))
if err != nil {
return nil, 0, err
}
req.Header.Set("Content-Type", dnsMsgType)
ctx, cancel := context.WithTimeout(context.Background(), c.Timeout)
defer cancel()
req = req.WithContext(ctx)
resp, err := c.HTTPClient.Do(req)
if err != nil {
return nil, 0, err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return nil, 0, fmt.Errorf("http error %d", resp.StatusCode)
}
data, err = io.ReadAll(resp.Body)
if err != nil {
return nil, 0, err
}
m := new(dns.Msg)
if err = m.Unpack(data); err != nil {
return nil, 0, err
}
return m, 0, nil
}

59
cloudflare_httpdns.go
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@ -1,59 +0,0 @@
package main
import (
"bytes"
"crypto/tls"
"fmt"
"io/ioutil"
"net/http"
"time"
"github.com/miekg/dns"
)
var httpclientCF = &http.Client{
Timeout: 8 * time.Second,
Transport: &http.Transport{
TLSClientConfig: &tls.Config{ServerName: "cloudflare-dns.com"},
TLSHandshakeTimeout: 5 * time.Second,
},
}
// CloudflareHTTPDns cloudflare http dns
type CloudflareHTTPDns struct {
}
// Exchange send request to server and get result
func (cf *CloudflareHTTPDns) Exchange(m *dns.Msg, addr string) (m1 *dns.Msg, d time.Duration, err error) {
u := fmt.Sprintf("https://%s/dns-query", addr)
data, err := m.Pack()
if err != nil {
return
}
body := bytes.NewBuffer(data)
req, err := http.NewRequest("POST", u, body)
if err != nil {
return
}
req.Header.Set("Content-Type", "application/dns-udpwireformat")
resp, err := httpclientCF.Do(req)
if err != nil {
return
}
defer resp.Body.Close()
data, err = ioutil.ReadAll(resp.Body)
if err != nil {
return
}
m1 = new(dns.Msg)
if err = m1.Unpack(data); err != nil {
return
}
return
}

209
conf.go
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@ -1,209 +0,0 @@
package main
import (
"bufio"
"io/ioutil"
"os"
"strings"
"github.com/go-yaml/yaml"
)
type conf struct {
Listen []addr
BlacklistFile string
HostFile string
ForwardRules []rule
DefaultUpstream []addr
Timeout int
Debug bool
blacklist item
hosts hostitem
}
type rule struct {
Server []addr
DomainFile string
domains item
}
type addr struct {
Host string
Port int
Network string
}
func loadConfig(f string) (*conf, error) {
c := new(conf)
data, err := ioutil.ReadFile(f)
if err != nil {
return nil, err
}
if err := yaml.Unmarshal(data, c); err != nil {
return nil, err
}
if c.blacklist == nil {
c.blacklist = item{}
}
if c.Timeout == 0 {
c.Timeout = 2
}
if err := loadItemFile(c.blacklist, c.BlacklistFile); err != nil {
return nil, err
}
for i := range c.ForwardRules {
if c.ForwardRules[i].domains == nil {
c.ForwardRules[i].domains = item{}
}
if err := loadItemFile(c.ForwardRules[i].domains,
c.ForwardRules[i].DomainFile); err != nil {
return nil, err
}
}
if c.hosts == nil {
c.hosts = hostitem{}
}
if err := loadHostsFile(c.hosts, c.HostFile); err != nil {
return nil, err
}
return c, nil
}
func loadHostsFile(h hostitem, f string) error {
if f == "" {
return nil
}
fd, err := os.Open(f)
if err != nil {
return err
}
defer fd.Close()
r := bufio.NewReader(fd)
for {
s, err := r.ReadString('\n')
if err != nil {
break
}
s1 := strings.Trim(s, " \t\r\n")
// ignore blank line and comment
if s1 == "" || s1[0] == '#' {
continue
}
s1 = strings.Replace(s1, "\t", " ", -1)
s1 = strings.Trim(s1, " \t\r\n")
ss := strings.Split(s1, " ")
// ipv4
t := 1
if strings.Index(ss[0], ":") != -1 {
// ipv6
t = 28
}
for _, s2 := range ss[1:] {
if s2 == "" {
continue
}
h.add(s2, ss[0], t)
}
}
return nil
}
func loadItemFile(it item, f string) error {
if f == "" {
return nil
}
fd, err := os.Open(f)
if err != nil {
return err
}
defer fd.Close()
r := bufio.NewReader(fd)
for {
s, err := r.ReadString('\n')
if s != "" {
s1 := strings.Trim(s, " \r\n")
if s1 != "" && s1[0] != '#' {
it.add(s1)
}
}
if err != nil {
break
}
}
return nil
}
type item map[string]int
func (it item) has(s string) bool {
ss := strings.Split(s, ".")
for i := 0; i < len(ss); i++ {
s1 := strings.Join(ss[i:], ".")
if _, ok := it[s1]; ok {
return true
}
}
return false
}
func (it item) exists(s string) bool {
_, ok := it[s]
return ok
}
func (it item) add(s string) {
it[s] = 1
}
type hostitem map[string][]hostentry
func (ht hostitem) get(domain string, t int) string {
if v, ok := ht[domain]; ok {
for _, v1 := range v {
if v1.domain == domain && v1.t == t {
return v1.ip
}
}
}
return ""
}
func (ht hostitem) add(domain, ip string, t int) {
if v, ok := ht[domain]; ok {
exists := false
for _, v1 := range v {
if v1.domain == domain && v1.ip == ip && v1.t == t {
exists = true
break
}
}
if !exists {
ht[domain] = append(ht[domain], hostentry{domain, ip, t})
}
} else {
v1 := []hostentry{{domain, ip, t}}
ht[domain] = v1
}
}
type hostentry struct {
domain string
ip string
t int
}

121
conf_test.go
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@ -1,121 +0,0 @@
package main
import (
"fmt"
//"github.com/go-yaml/yaml"
//"io/ioutil"
"testing"
)
func TestConf(t *testing.T) {
c, err := loadConfig("testdata/config.yaml")
if err != nil {
t.Fatal(err)
}
//fmt.Printf("%#v\n", c)
if len(c.Listen) != 2 {
t.Errorf("expected listers 2, got %d", len(c.Listen))
}
if !c.blacklist.exists("1.2.3.4") {
fmt.Printf("%#v\n", c.blacklist)
t.Errorf("blacklist load failed")
}
if c.hosts.get("localhost", 1) != "127.0.0.1" {
fmt.Printf("%#v\n", c.hosts)
t.Errorf("hosts load failed")
}
if c.hosts.get("localhost", 28) != "::1" {
fmt.Printf("%#v\n", c.hosts)
t.Errorf("hosts load failed")
}
if len(c.ForwardRules) != 2 {
fmt.Printf("%#v\n", c.ForwardRules)
t.Errorf("expected rules 2, got %d", len(c.ForwardRules))
}
if !c.ForwardRules[0].domains.has("a.com") {
fmt.Printf("%#v\n", c.ForwardRules[0].domains)
t.Errorf("some domains should exit, may be load config failed")
}
if !c.ForwardRules[1].domains.has("d.com") {
fmt.Printf("%#v\n", c.ForwardRules[1].domains)
t.Errorf("some domains should exit, may be load config failed")
}
}
func TestItemExists(t *testing.T) {
it := item{
"google.cn": 1,
"www.baidu.com": 1,
"org": 1,
}
testdata := []struct {
d string
b bool
}{
{"google.cn", true},
{"www.google.cn", false},
{"www.a.org", false},
}
for _, d := range testdata {
b1 := it.exists(d.d)
if b1 != d.b {
t.Errorf("%s, expected %v, got %v", d.d, d.b, b1)
}
}
}
func TestItemHas(t *testing.T) {
it := item{
"google.cn": 1,
"www.baidu.com": 1,
"org": 1,
}
testdata := []struct {
d string
b bool
}{
{"google.cn", true},
{"www.google.cn", true},
{"www.a.org", true},
{"pan.baidu.com", false},
{"abc.org", true},
}
for _, d := range testdata {
b1 := it.has(d.d)
if b1 != d.b {
t.Errorf("%s, expected %v, got %v", d.d, d.b, b1)
}
}
}
func TestItemAdd(t *testing.T) {
it := item{}
it.add("www.example.org")
if !it.exists("www.example.org") {
t.Errorf("add failed")
}
}
func TestHostitem(t *testing.T) {
ht := hostitem{}
testdata := []hostentry{
{"www.google.com", "127.0.0.1", 1},
{"www.google.com", "127.0.0.2", 28},
{"www.example.org", "127.0.0.3", 28},
{"www.abc.org", "127.0.0.4", 1},
}
for _, d := range testdata {
ht.add(d.domain, d.ip, d.t)
ip := ht.get(d.domain, d.t)
if ip != d.ip {
t.Errorf("%s, expected %s, got %s", d.domain, d.ip, ip)
}
}
//fmt.Printf("%v\n", ht)
}

33
config.go
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@ -0,0 +1,33 @@
package main
import (
"os"
"github.com/go-yaml/yaml"
)
type conf struct {
UpstreamServers []string `yaml:"upstream_servers"`
BootstrapServers []string `yaml:"bootstrap_servers"`
Listen []listen `yaml:"listen"`
UpstreamTimeout int `yaml:"upstream_timeout"`
UpstreamInsecure bool `yaml:"upstream_insecure"`
}
type listen struct {
Addr string `yaml:"addr"`
Cert string `yaml:"cert"`
Key string `yaml:"key"`
}
func loadConfig(f string) (*conf, error) {
data, err := os.ReadFile(f)
if err != nil {
return nil, err
}
var c conf
if err := yaml.Unmarshal(data, &c); err != nil {
return nil, err
}
return &c, nil
}

79
config_example.yaml
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@ -1,53 +1,40 @@
# upstream servers
# support DoH(DNS over https/http2), tcp, udp and tls(dns over tls)
upstream_servers:
- https://cloudflare-dns.com/dns-query
- tcp://1.0.0.1:53
- udp://1.0.0.1:53
- tls://cloudflare-dns:853
# bootstrap dns server,
# this used to resolve the domain name used in Doh and TLS,
# not needed if you don't use DoH and tls
bootstrap_servers:
- tcp://1.0.0.1:53
- udp://1.0.0.1:53
# listen ports
listen: listen:
- -
network: tcp addr: tcp://0.0.0.0:1053
host: 0.0.0.0 cert:
port: 1053 key:
-
network: udp
host: 0.0.0.0
port: 1053
blacklistfile: ./testdata/blacklist.dat
hostfile: ./testdata/hosts
timeout: 2
debug: true
defaultupstream:
-
network: tcp
host: 8.8.8.8
port: 53
- -
network: udp addr: udp://0.0.0.0:1053
host: 8.8.8.8 cert:
port: 53 key:
forwardrules:
-
domainfile: ./testdata/cn.dat
server:
-
network: tcp
host: 114.114.114.114
port: 53
- -
domainfile: testdata/us.dat addr: https://0.0.0.0:1054/dns-query
server: cert: server.crt
key: server.key
- -
network: tcp addr: tls://0.0.0.1:1055
host: 8.8.8.8 cert: server.crt
port: 53 key: server.key
- # timeout for upstream server, second
network: https_google upstream_timeout: 3
host: 172.217.161.174
port: 443
- # check upstream certificate or not
network: https_cloudflare # if you use self signed certificate, set this to true
host: 1.1.1.1 upstream_insecure: false
port: 443

22
go.mod
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@ -0,0 +1,22 @@
module github.com/fangdingjun/gdns
go 1.17
require (
github.com/fangdingjun/go-log/v5 v5.0.0
github.com/fangdingjun/protolistener v0.0.0-20210804081554-626e6590d6e7
github.com/go-yaml/yaml v2.1.0+incompatible
github.com/miekg/dns v1.1.43
golang.org/x/net v0.0.0-20210726213435-c6fcb2dbf985
)
require (
github.com/kr/pretty v0.3.0 // indirect
github.com/pires/go-proxyproto v0.6.1 // indirect
golang.org/x/crypto v0.0.0-20210711020723-a769d52b0f97 // indirect
golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c // indirect
golang.org/x/term v0.0.0-20210615171337-6886f2dfbf5b // indirect
golang.org/x/text v0.3.6 // indirect
gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c // indirect
gopkg.in/yaml.v2 v2.4.0 // indirect
)

51
go.sum
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@ -0,0 +1,51 @@
github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
github.com/fangdingjun/go-log/v5 v5.0.0 h1:vdh9Bk9C4ZFL6KoO6rII73zQIyaLf7hFdBvucO/ckiE=
github.com/fangdingjun/go-log/v5 v5.0.0/go.mod h1:V012Oxo0/pSbccX4OFSp9MJglXwNsZo2ByBBorr7zzM=
github.com/fangdingjun/protolistener v0.0.0-20210804081554-626e6590d6e7 h1:z5NlLvUNbGZxQhtUZELvIorAqpDmcIhGQXE5GdO7+5I=
github.com/fangdingjun/protolistener v0.0.0-20210804081554-626e6590d6e7/go.mod h1:ljbjhI4fVrT5GwMu1iBhWTZwLJSqsXKwKlGKas5GudM=
github.com/go-yaml/yaml v2.1.0+incompatible h1:RYi2hDdss1u4YE7GwixGzWwVo47T8UQwnTLB6vQiq+o=
github.com/go-yaml/yaml v2.1.0+incompatible/go.mod h1:w2MrLa16VYP0jy6N7M5kHaCkaLENm+P+Tv+MfurjSw0=
github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
github.com/kr/pretty v0.2.1/go.mod h1:ipq/a2n7PKx3OHsz4KJII5eveXtPO4qwEXGdVfWzfnI=
github.com/kr/pretty v0.3.0 h1:WgNl7dwNpEZ6jJ9k1snq4pZsg7DOEN8hP9Xw0Tsjwk0=
github.com/kr/pretty v0.3.0/go.mod h1:640gp4NfQd8pI5XOwp5fnNeVWj67G7CFk/SaSQn7NBk=
github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
github.com/miekg/dns v1.1.43 h1:JKfpVSCB84vrAmHzyrsxB5NAr5kLoMXZArPSw7Qlgyg=
github.com/miekg/dns v1.1.43/go.mod h1:+evo5L0630/F6ca/Z9+GAqzhjGyn8/c+TBaOyfEl0V4=
github.com/pires/go-proxyproto v0.6.0/go.mod h1:Odh9VFOZJCf9G8cLW5o435Xf1J95Jw9Gw5rnCjcwzAY=
github.com/pires/go-proxyproto v0.6.1 h1:EBupykFmo22SDjv4fQVQd2J9NOoLPmyZA/15ldOGkPw=
github.com/pires/go-proxyproto v0.6.1/go.mod h1:Odh9VFOZJCf9G8cLW5o435Xf1J95Jw9Gw5rnCjcwzAY=
github.com/rogpeppe/go-internal v1.6.1 h1:/FiVV8dS/e+YqF2JvO3yXRFbBLTIuSDkuC7aBOAvL+k=
github.com/rogpeppe/go-internal v1.6.1/go.mod h1:xXDCJY+GAPziupqXw64V24skbSoqbTEfhy4qGm1nDQc=
golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
golang.org/x/crypto v0.0.0-20210711020723-a769d52b0f97 h1:/UOmuWzQfxxo9UtlXMwuQU8CMgg1eZXqTRwkSQJWKOI=
golang.org/x/crypto v0.0.0-20210711020723-a769d52b0f97/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
golang.org/x/net v0.0.0-20210726213435-c6fcb2dbf985 h1:4CSI6oo7cOjJKajidEljs9h+uP0rRZBPPPhcCbj5mw8=
golang.org/x/net v0.0.0-20210726213435-c6fcb2dbf985/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
golang.org/x/sync v0.0.0-20210220032951-036812b2e83c h1:5KslGYwFpkhGh+Q16bwMP3cOontH8FOep7tGV86Y7SQ=
golang.org/x/sync v0.0.0-20210220032951-036812b2e83c/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20210303074136-134d130e1a04/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c h1:F1jZWGFhYfh0Ci55sIpILtKKK8p3i2/krTr0H1rg74I=
golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
golang.org/x/term v0.0.0-20210615171337-6886f2dfbf5b h1:9zKuko04nR4gjZ4+DNjHqRlAJqbJETHwiNKDqTfOjfE=
golang.org/x/term v0.0.0-20210615171337-6886f2dfbf5b/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
golang.org/x/text v0.3.6 h1:aRYxNxv6iGQlyVaZmk6ZgYEDa+Jg18DxebPSrd6bg1M=
golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=

184
google_httpdns.go
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@ -1,184 +0,0 @@
package main
import (
"crypto/tls"
"encoding/json"
"fmt"
"io/ioutil"
"net"
"net/http"
"net/url"
"sync"
"time"
"github.com/miekg/dns"
)
// ServerAddr is Google dns server ip
var ServerAddr = "74.125.200.100"
var queryIPApi = "https://www.simicloud.com/media/httpbin/ip"
// GoogleHTTPDns struct
type GoogleHTTPDns struct {
myip string
l sync.Mutex
}
func (h *GoogleHTTPDns) getMyIP() string {
if h.myip != "" {
return h.myip
}
go h.queryMyIP()
return ""
}
type ipAPI struct {
IP string `json:"origin"`
}
func (h *GoogleHTTPDns) queryMyIP() {
h.l.Lock()
defer h.l.Unlock()
if h.myip != "" {
//fmt.Printf("myip: %s\n", h.myip)
return
}
//fmt.Println("get ip...")
res, err := http.Get(queryIPApi)
if err != nil {
//fmt.Println(err)
return
}
defer res.Body.Close()
d, err := ioutil.ReadAll(res.Body)
if err != nil {
//fmt.Println(err)
return
}
//fmt.Printf("%s\n", string(d))
ip := ipAPI{}
err = json.Unmarshal(d, &ip)
if err != nil {
//fmt.Println(err)
return
}
//fmt.Printf("got: %s\n", ip.Ip)
h.myip = ip.IP
}
func (h *GoogleHTTPDns) getMyNet() string {
ip := h.getMyIP()
if ip == "" {
return ""
}
mask := net.IPv4Mask(255, 255, 255, 0)
ipByte := net.ParseIP(ip)
ipnet := net.IPNet{IP: ipByte.Mask(mask), Mask: mask}
return ipnet.String()
}
// Exchange send query to server and return the response
func (h *GoogleHTTPDns) Exchange(m *dns.Msg, addr string) (*dns.Msg, time.Duration, error) {
name := m.Question[0].Name
t := dns.TypeToString[m.Question[0].Qtype]
mynet := h.getMyNet()
r, err := queryGoogleHTTPDNS(name, t, mynet, "", addr)
if err != nil {
return nil, 0, err
}
m1 := new(dns.Msg)
m1.SetRcode(m, r.Status)
for _, rr := range r.Answer {
_rr := fmt.Sprintf("%s %d IN %s %s", rr.Name, rr.TTL,
dns.TypeToString[uint16(rr.Type)], rr.Data)
an, err := dns.NewRR(_rr)
if err != nil {
return nil, 0, err
}
m1.Answer = append(m1.Answer, an)
}
m1.Truncated = r.TC
m1.RecursionDesired = r.RD
m1.RecursionAvailable = r.RA
m1.AuthenticatedData = r.AD
m1.CheckingDisabled = r.CD
return m1, 0, nil
}
// Response represent the dns response from server
type Response struct {
Status int
TC bool
RD bool
RA bool
AD bool
CD bool
Question []RR
Answer []RR
Additional []RR
EDNSClientSubnet string `json:"edns_client_subnet"`
Comment string
}
// RR represent the RR record
type RR struct {
Name string `json:"name"`
Type int `json:"type"`
TTL int
Data string `json:"data"`
}
var httpclient = &http.Client{
Timeout: 8 * time.Second,
Transport: &http.Transport{
TLSClientConfig: &tls.Config{ServerName: "dns.google.com"},
TLSHandshakeTimeout: 5 * time.Second,
},
}
func queryGoogleHTTPDNS(name, t, ednsClientSubnet, padding, srvAddr string) (*Response, error) {
srvaddr := ServerAddr
if srvAddr != "" {
srvaddr = srvAddr
}
v := url.Values{}
v.Add("name", name)
v.Add("type", t)
if ednsClientSubnet != "" {
v.Add("edns_client_subnet", ednsClientSubnet)
}
if padding != "" {
v.Add("random_padding", padding)
}
u := fmt.Sprintf("https://%s/resolve?%s", srvaddr, v.Encode())
r, _ := http.NewRequest("GET", u, nil)
r.Host = "dns.google.com"
//r.URL.Host = "dns.google.com"
res, err := httpclient.Do(r)
if err != nil {
return nil, err
}
defer res.Body.Close()
data, err := ioutil.ReadAll(res.Body)
if err != nil {
return nil, err
}
d := Response{}
err = json.Unmarshal(data, &d)
if err != nil {
return nil, err
}
return &d, nil
}

177
handler.go
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@ -1,177 +0,0 @@
package main
import (
"errors"
"fmt"
"strings"
"time"
"github.com/fangdingjun/go-log"
"github.com/miekg/dns"
)
type dnsClient interface {
Exchange(m *dns.Msg, addr string) (*dns.Msg, time.Duration, error)
}
type dnsHandler struct {
cfg *conf
tcpclient dnsClient
udpclient dnsClient
httpsgoogle dnsClient
httpscf dnsClient
}
func newDNSHandler(cfg *conf) *dnsHandler {
return &dnsHandler{
cfg: cfg,
tcpclient: &dns.Client{Net: "tcp", Timeout: 8 * time.Second, UDPSize: 4096},
udpclient: &dns.Client{Net: "udp", Timeout: 5 * time.Second, UDPSize: 4096},
httpsgoogle: &GoogleHTTPDns{},
httpscf: &CloudflareHTTPDns{},
}
}
// ServerDNS implements the dns.Handler interface
func (h *dnsHandler) ServeDNS(w dns.ResponseWriter, r *dns.Msg) {
domain := r.Question[0].Name
if ok := h.answerFromHosts(w, r); ok {
return
}
srvs := h.getUpstreamServer(domain)
if srvs == nil {
srvs = h.cfg.DefaultUpstream
}
if msg, err := h.getAnswerFromUpstream(r, srvs); err == nil {
w.WriteMsg(msg)
return
}
dns.HandleFailed(w, r)
}
func (h *dnsHandler) getUpstreamServer(domain string) []addr {
for _, srv := range h.cfg.ForwardRules {
if ok := srv.domains.has(strings.Trim(domain, ".")); ok {
return srv.Server
}
}
return nil
}
func (h *dnsHandler) queryUpstream(r *dns.Msg, srv addr, ch chan *dns.Msg) {
var m *dns.Msg
var err error
switch srv.Network {
case "tcp":
log.Debugf("query %s IN %s, forward to %s:%d through tcp",
r.Question[0].Name,
dns.TypeToString[r.Question[0].Qtype],
srv.Host,
srv.Port)
m, _, err = h.tcpclient.Exchange(r, fmt.Sprintf("%s:%d", srv.Host, srv.Port))
case "udp":
log.Debugf("query %s IN %s, forward to %s:%d through udp",
r.Question[0].Name,
dns.TypeToString[r.Question[0].Qtype],
srv.Host,
srv.Port)
m, _, err = h.udpclient.Exchange(r, fmt.Sprintf("%s:%d", srv.Host, srv.Port))
case "https_google":
log.Debugf("query %s IN %s, forward to %s:%d through google https",
r.Question[0].Name,
dns.TypeToString[r.Question[0].Qtype],
srv.Host,
srv.Port)
m, _, err = h.httpsgoogle.Exchange(r, fmt.Sprintf("%s:%d", srv.Host, srv.Port))
case "https_cloudflare":
log.Debugf("query %s IN %s, forward to %s:%d through cloudflare https",
r.Question[0].Name,
dns.TypeToString[r.Question[0].Qtype],
srv.Host,
srv.Port)
m, _, err = h.httpscf.Exchange(r, srv.Host)
default:
err = fmt.Errorf("not supported type %s", srv.Network)
}
if err != nil {
log.Errorf("%s", err)
return
}
select {
case ch <- m:
default:
}
}
func (h *dnsHandler) getAnswerFromUpstream(r *dns.Msg, servers []addr) (*dns.Msg, error) {
ch := make(chan *dns.Msg, len(servers))
for _, srv := range servers {
go func(a addr) {
h.queryUpstream(r, a, ch)
}(srv)
}
var savedErr *dns.Msg
for {
select {
case m := <-ch:
if m.Rcode == dns.RcodeSuccess && !h.inBlacklist(m) {
return m, nil
}
savedErr = m
case <-time.After(time.Duration(h.cfg.Timeout) * time.Second):
if savedErr != nil {
return savedErr, nil
}
log.Debugf("query %s IN %s, timeout", r.Question[0].Name, dns.TypeToString[r.Question[0].Qtype])
return nil, errors.New("timeout")
}
}
}
func (h *dnsHandler) inBlacklist(m *dns.Msg) bool {
var ip string
for _, rr := range m.Answer {
if a, ok := rr.(*dns.A); ok {
ip = a.A.String()
} else if aaaa, ok := rr.(*dns.AAAA); ok {
ip = aaaa.AAAA.String()
} else {
ip = ""
}
if ip != "" && h.cfg.blacklist.exists(ip) {
log.Debugf("%s in blacklist", ip)
return true
}
}
return false
}
func (h *dnsHandler) answerFromHosts(w dns.ResponseWriter, r *dns.Msg) bool {
domain := r.Question[0].Name
t := r.Question[0].Qtype
ip := h.cfg.hosts.get(strings.Trim(domain, "."), int(t))
if ip != "" {
rr, _ := dns.NewRR(fmt.Sprintf("%s 3600 IN %s %s", domain, dns.TypeToString[t], ip))
if rr == nil {
return false
}
msg := new(dns.Msg)
msg.SetReply(r)
msg.Answer = append(msg.Answer, rr)
w.WriteMsg(msg)
log.Debugf("query %s IN %s, reply from hosts", domain, dns.TypeToString[t])
return true
}
return false
}

67
main.go
Unescape Escape View File

@ -0,0 +1,67 @@
package main
import (
"flag"
"fmt"
"os"
"os/signal"
"syscall"
log "github.com/fangdingjun/go-log/v5"
)
var cfg *conf
func main() {
var configfile string
var logFileCount int
var logFileSize int64
var loglevel string
var logfile string
flag.StringVar(&logfile, "log_file", "", "log file, default stdout")
flag.IntVar(&logFileCount, "log_count", 10, "max count of log to keep")
flag.Int64Var(&logFileSize, "log_size", 10, "max log file size MB")
flag.StringVar(&loglevel, "log_level", "INFO",
"log level, values:\nOFF, FATAL, PANIC, ERROR, WARN, INFO, DEBUG")
flag.StringVar(&configfile, "c", "gdns.yaml", "config file")
flag.Parse()
if logfile != "" {
log.Default.Out = &log.FixedSizeFileWriter{
MaxCount: logFileCount,
Name: logfile,
MaxSize: logFileSize * 1024 * 1024,
}
}
if loglevel != "" {
lv, err := log.ParseLevel(loglevel)
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
log.Default.Level = lv
}
_cfg, err := loadConfig(configfile)
if err != nil {
log.Fatal(err)
}
cfg = _cfg
if cfg.UpstreamTimeout == 0 {
cfg.UpstreamTimeout = 5
}
initDNSClient(cfg)
log.Debugf("%+v", cfg)
makeServers(cfg)
ch := make(chan os.Signal, 2)
signal.Notify(ch, syscall.SIGINT, syscall.SIGTERM)
s := <-ch
log.Errorf("received signal %s, exit...", s)
log.Println("exit.")
}

56
middleware.go
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@ -0,0 +1,56 @@
package main
import (
"net/http"
log "github.com/fangdingjun/go-log/v5"
)
type logHandler struct {
status int
w http.ResponseWriter
size int
}
func (lh *logHandler) WriteHeader(status int) {
lh.status = status
lh.w.WriteHeader(status)
}
func (lh *logHandler) Write(buf []byte) (int, error) {
lh.size += len(buf)
return lh.w.Write(buf)
}
func (lh *logHandler) Header() http.Header {
return lh.w.Header()
}
func (lh *logHandler) Status() int {
if lh.status != 0 {
return lh.status
}
return 200
}
var _ http.ResponseWriter = &logHandler{}
// LogHandler is a log middleware
// record request log
func LogHandler(handler http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
defer func() {
if err := recover(); err != nil {
log.Error(err)
w.WriteHeader(http.StatusInternalServerError)
log.Infof("\"%s - %s %s %s\" - %d %d \"%s\"",
r.RemoteAddr, r.Method, r.RequestURI, r.Proto, 500, 0, r.UserAgent())
}
}()
lh := &logHandler{w: w}
handler.ServeHTTP(lh, r)
log.Infof("\"%s - %s %s %s\" - %d %d \"%s\"",
r.RemoteAddr, r.Method, r.RequestURI, r.Proto, lh.Status(), lh.size, r.UserAgent())
})
}

171
server.go
Unescape Escape View File

@ -1,67 +1,158 @@
package main package main
import ( import (
"flag" "crypto/tls"
"fmt" "fmt"
"os" "net"
"net/http"
"net/url"
"strconv"
"github.com/fangdingjun/go-log" log "github.com/fangdingjun/go-log/v5"
"github.com/fangdingjun/go-log/formatters" "github.com/fangdingjun/protolistener"
"github.com/fangdingjun/go-log/writers"
"github.com/miekg/dns"
) )
func main() { type server struct {
var configfile string addr *url.URL
var logfile string cert string
var loglevel string key string
var logFileSize int64 upstreams []*url.URL
var logFileCount int }
func (srv *server) serve() {
switch srv.addr.Scheme {
case "udp":
srv.serveUDP()
case "tcp":
srv.serveTCP()
case "tls":
srv.serveTLS()
case "http":
srv.serveHTTP()
case "https":
srv.serveHTTP()
default:
log.Fatalf("unsupported type %s", srv.addr.Scheme)
}
}
func (srv *server) serveUDP() {
ip, port, _ := net.SplitHostPort(srv.addr.Host)
_ip := net.ParseIP(ip)
_port, _ := strconv.Atoi(port)
flag.StringVar(&configfile, "c", "config.yaml", "config file") udpconn, err := net.ListenUDP("udp", &net.UDPAddr{IP: _ip, Port: _port})
flag.StringVar(&logfile, "log_file", "", "log file, default stdout") if err != nil {
flag.IntVar(&logFileCount, "log_count", 10, "max count of log to keep") log.Fatalf("listen udp error %s", err)
flag.Int64Var(&logFileSize, "log_size", 10, "max log file size MB") }
flag.StringVar(&loglevel, "log_level", "INFO", "log level, values:\nOFF, FATAL, PANIC, ERROR, WARN, INFO, DEBUG")
flag.Parse() defer udpconn.Close()
if logfile != "" { buf := make([]byte, 4096)
log.Default.Out = &writers.FixedSizeFileWriter{ for {
MaxCount: logFileCount, n, addr, err := udpconn.ReadFrom(buf)
Name: logfile, if err != nil {
MaxSize: logFileSize * 1024 * 1024, log.Debugln(err)
break
} }
buf1 := make([]byte, n)
copy(buf1, buf[:n])
go srv.handleUDP(buf1, addr, udpconn)
} }
}
if loglevel != "" { func (srv *server) serveTCP() {
lv, err := log.ParseLevel(loglevel) l, err := net.Listen("tcp", srv.addr.Host)
if err != nil { if err != nil {
fmt.Fprintln(os.Stderr, err) log.Fatalln("listen tcp", err)
os.Exit(1)
} }
log.Default.Level = lv defer l.Close()
log.Debugf("listen tcp://%s", l.Addr().String())
for {
conn, err := l.Accept()
if err != nil {
log.Debugln(err)
break
}
go srv.handleTCP(conn)
} }
}
log.Default.Formatter = &formatters.TextFormatter{TimeFormat: "2006-01-02 15:04:05.000"} func (srv *server) serveTLS() {
cert, err := tls.LoadX509KeyPair(srv.cert, srv.key)
if err != nil {
log.Fatalln("load certificate failed", err)
}
config, err := loadConfig(configfile) l, err := net.Listen("tcp", srv.addr.Host)
if err != nil { if err != nil {
log.Fatal(err) log.Fatalln("listen tls", err)
}
defer l.Close()
log.Debugf("listen tls://%s", l.Addr().String())
tl := tls.NewListener(protolistener.New(l), &tls.Config{
Certificates: []tls.Certificate{cert},
//NextProtos: []string{"h2"},
})
for {
conn, err := tl.Accept()
if err != nil {
log.Debugln("tls accept", err)
break
}
go srv.handleTCP(conn)
} }
}
log.Debugf("config: %+v", config) func (srv *server) serveHTTP() {
log.Debugf("listen %s://%s", srv.addr.Scheme, srv.addr.Host)
h := newDNSHandler(config) l, err := net.Listen("tcp", srv.addr.Host)
if err != nil {
log.Fatalln("listen https", err)
}
defer l.Close()
for _, l := range config.Listen { httpsrv := &http.Server{
go func(l addr) { Handler: LogHandler(srv),
log.Infof("listen on %s %s:%d", l.Network, l.Host, l.Port) }
if err := dns.ListenAndServe( switch srv.addr.Scheme {
fmt.Sprintf("%s:%d", l.Host, l.Port), l.Network, h); err != nil { case "http":
err = httpsrv.Serve(protolistener.New(l))
case "https":
err = httpsrv.ServeTLS(protolistener.New(l), srv.cert, srv.key)
default:
err = fmt.Errorf("not supported %s", srv.addr.Scheme)
}
if err != nil {
log.Fatal(err) log.Fatal(err)
} }
}(l) }
func makeServers(c *conf) {
upstreams := []*url.URL{}
for _, a := range c.UpstreamServers {
u, err := url.Parse(a)
if err != nil {
log.Fatal(err)
}
upstreams = append(upstreams, u)
} }
select {} for _, l := range c.Listen {
u, err := url.Parse(l.Addr)
if err != nil {
log.Fatal(err)
}
srv := &server{
addr: u,
cert: l.Cert,
key: l.Key,
upstreams: upstreams,
}
go srv.serve()
}
} }

66
server_https.go
Unescape Escape View File

@ -0,0 +1,66 @@
package main
import (
"io"
"net/http"
log "github.com/fangdingjun/go-log/v5"
"github.com/miekg/dns"
)
const dnsMsgType = "application/dns-message"
func (srv *server) handleHTTPReq(w http.ResponseWriter, r *http.Request) {
/*
ctype := r.Header.Get("content-type")
if !strings.HasPrefix(ctype, dnsMsgType) {
log.Errorf("request type %s, require %s", ctype, dnsMsgType)
http.Error(w, "dns message is required", http.StatusBadRequest)
return
}
*/
if r.ContentLength < 10 {
log.Errorf("message is too small, %v", r.ContentLength)
http.Error(w, "message is too small", http.StatusBadRequest)
return
}
data, err := io.ReadAll(r.Body)
if err != nil {
log.Errorln("read request body", err)
http.Error(w, "read request failed", http.StatusBadRequest)
return
}
msg := new(dns.Msg)
if err := msg.Unpack(data); err != nil {
log.Errorln("parse dns message", err)
http.Error(w, "parse dns message error", http.StatusBadRequest)
return
}
m, err := getResponseFromUpstream(msg, srv.upstreams)
if err != nil {
log.Debugln("query", msg.Question[0].String(), "timeout")
http.Error(w, "query upstream server failed", http.StatusServiceUnavailable)
return
}
for _, a := range m.Answer {
log.Debugln("result", a.String())
}
w.Header().Set("content-type", dnsMsgType)
d, _ := m.Pack()
if _, err := w.Write(d); err != nil {
log.Errorln(err)
}
}
func (srv *server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
if r.RequestURI != srv.addr.Path {
http.Error(w, "Path not found", http.StatusNotFound)
return
}
srv.handleHTTPReq(w, r)
}

35
server_tcp.go
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@ -0,0 +1,35 @@
package main
import (
"net"
log "github.com/fangdingjun/go-log/v5"
"github.com/miekg/dns"
)
func (srv *server) handleTCP(c net.Conn) {
defer c.Close()
log.Debugln("tcp from", c.RemoteAddr())
conn := dns.Conn{Conn: c}
for {
msg, err := conn.ReadMsg()
if err != nil {
log.Debugln("tcp read message", err)
break
}
m, err := getResponseFromUpstream(msg, srv.upstreams)
if err != nil {
log.Debugln("query", msg.Question[0].String(), "timeout")
break
}
for _, a := range m.Answer {
log.Debugln("result", a.String())
}
if err := conn.WriteMsg(m); err != nil {
log.Errorln(err)
break
}
}
}

30
server_udp.go
Unescape Escape View File

@ -0,0 +1,30 @@
package main
import (
"net"
log "github.com/fangdingjun/go-log/v5"
"github.com/miekg/dns"
)
func (srv *server) handleUDP(buf []byte, addr net.Addr, conn *net.UDPConn) {
msg := new(dns.Msg)
if err := msg.Unpack(buf); err != nil {
log.Debugln("udp parse msg", err)
return
}
m, err := getResponseFromUpstream(msg, srv.upstreams)
if err != nil {
log.Debugln("query", msg.Question[0].String(), "timeout")
return
}
for _, a := range m.Answer {
log.Debugln("result", a.String())
}
d, _ := m.Pack()
if _, err := conn.WriteTo(d, addr); err != nil {
log.Errorln(err)
}
}

5
testdata/blacklist.dat vendored
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@ -1,5 +0,0 @@
# asdfas
1.2.3.4
2.3.1.21
3.1.1.1

8
testdata/cn.dat vendored
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@ -1,8 +0,0 @@
#12
a.com
b.org
cn
c.net

31
testdata/config.yaml vendored
Unescape Escape View File

@ -1,31 +0,0 @@
listen:
- network: tcp
host: 0.0.0.0
port: 1053
- network: udp
host: 0.0.0.0
port: 1053
blacklistfile: ./testdata/blacklist.dat
hostfile: ./testdata/hosts
timeout: 2
debug: true
forwardrules:
- domainfile: ./testdata/cn.dat
server:
- network: tcp
host: 114.114.114.114
port: 53
- domainfile: testdata/us.dat
server:
- network: tcp
host: 8.8.8.8
port: 53
- network: https
host: 74.175.200.200
port: 443

9
testdata/hosts vendored
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@ -1,9 +0,0 @@
#asdf
1.2.3.1 a.com b.com c.aaa
1.2.9.1 addd bbb ddd aa
::1 localhost
127.0.0.1 localhost
1.2.1.1 kkddaso
# daas

12
testdata/us.dat vendored
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@ -1,12 +0,0 @@
#
us
b.cc
a.cc
dda
# da
a.cf
d.com

201
upstream.go
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@ -0,0 +1,201 @@
package main
import (
"bufio"
"context"
"crypto/tls"
"errors"
"fmt"
"net"
"net/http"
"net/url"
"os"
"strings"
"time"
log "github.com/fangdingjun/go-log/v5"
"github.com/miekg/dns"
"golang.org/x/net/http2"
)
var dnsClientTCP *dns.Client
var dnsClientUDP *dns.Client
var dnsClientTLS *dns.Client
var dnsClientHTTPS *httpclient
func getResponseFromUpstream(msg *dns.Msg, upstreams []*url.URL) (*dns.Msg, error) {
ctx, cancel := context.WithTimeout(context.Background(), time.Duration(cfg.UpstreamTimeout+1)*time.Second)
defer cancel()
resch := make(chan *dns.Msg, len(upstreams))
for _, up := range upstreams {
go func(u *url.URL) {
m, err := queryUpstream(msg, u)
if err == nil {
resch <- m
return
}
log.Errorln(u.String(), err)
}(up)
}
var errmsg *dns.Msg
for i := 0; i < len(upstreams); i++ {
select {
case <-ctx.Done():
return nil, errors.New("time out")
case m := <-resch:
if m.MsgHdr.Rcode == dns.RcodeSuccess {
return m, nil
}
errmsg = m
}
}
if errmsg != nil {
return errmsg, nil
}
return nil, errors.New("empty result")
}
func queryUpstream(msg *dns.Msg, upstream *url.URL) (*dns.Msg, error) {
switch upstream.Scheme {
case "tcp":
return queryUpstreamTCP(msg, upstream)
case "https":
return queryUpstreamHTTPS(msg, upstream)
case "udp":
return queryUpstreamUDP(msg, upstream)
case "tls":
return queryUpstreamTLS(msg, upstream)
default:
}
return nil, errors.New("unknown upstream type")
}
func queryUpstreamUDP(msg *dns.Msg, upstream *url.URL) (*dns.Msg, error) {
m, _, err := dnsClientUDP.Exchange(msg, upstream.Host)
if err != nil {
log.Debugf("query udp error %s", err)
}
return m, err
}
func queryUpstreamTCP(msg *dns.Msg, upstream *url.URL) (*dns.Msg, error) {
m, _, err := dnsClientTCP.Exchange(msg, upstream.Host)
if err != nil {
log.Debugf("query tcp error %s", err)
}
return m, err
}
func queryUpstreamTLS(msg *dns.Msg, upstream *url.URL) (*dns.Msg, error) {
m, _, err := dnsClientTLS.Exchange(msg, upstream.Host)
if err != nil {
log.Debugf("query tls error %s", err)
}
return m, err
}
func queryUpstreamHTTPS(msg *dns.Msg, upstream *url.URL) (*dns.Msg, error) {
m, _, err := dnsClientHTTPS.Exchange(msg, upstream.String())
if err != nil {
log.Debugf("query https error %s", err)
}
return m, err
}
func initDNSClient(c *conf) {
var resolver = new(net.Resolver)
if len(c.BootstrapServers) > 0 {
log.Debugf("init dns client, bootstrap servers %v", c.BootstrapServers)
resolver = &net.Resolver{
Dial: func(ctx context.Context, network, addr string) (net.Conn, error) {
for _, a := range c.BootstrapServers {
u, _ := url.Parse(a)
conn, err := net.Dial(u.Scheme, u.Host)
if err == nil {
return conn, err
}
}
return nil, errors.New("dial failed")
},
}
}
dialer := &net.Dialer{
Resolver: resolver,
}
dnsClientTLS = &dns.Client{
Net: "tcp-tls",
Timeout: time.Duration(c.UpstreamTimeout) * time.Second,
Dialer: dialer,
TLSConfig: &tls.Config{
InsecureSkipVerify: c.UpstreamInsecure,
},
}
dnsClientUDP = &dns.Client{
Net: "udp",
Timeout: time.Duration(c.UpstreamTimeout) * time.Second,
}
dnsClientTCP = &dns.Client{
Net: "tcp",
Timeout: time.Duration(c.UpstreamTimeout) * time.Second,
}
dnsClientHTTPS = &httpclient{
Net: "https",
Timeout: time.Duration(c.UpstreamTimeout) * time.Second,
HTTPClient: &http.Client{
Transport: &http2.Transport{
DialTLS: func(network, addr string, cfg *tls.Config) (net.Conn, error) {
log.Debugln("dial to", network, addr)
p := os.Getenv("https_proxy")
if p == "" {
p = os.Getenv("http_proxy")
}
if p == "" {
conn, err := tls.DialWithDialer(dialer, network, addr, cfg)
return conn, err
}
u, _ := url.Parse(p)
log.Debugf("dial to proxy %s", u.Host)
conn, err := net.Dial(network, u.Host)
if err != nil {
return nil, err
}
fmt.Fprintf(conn, "CONNECT %s HTTP/1.1\r\nHost: %s\r\n\r\n", addr, addr)
r := bufio.NewReader(conn)
line, err := r.ReadString('\n')
if err != nil {
return nil, err
}
ss := strings.Fields(line)
if ss[1] != "200" {
return nil, fmt.Errorf("http code %s", ss[1])
}
for {
line, err := r.ReadString('\n')
if err != nil {
return nil, err
}
line = strings.Trim(line, "\r\n")
if line == "" {
break
}
}
tlsconn := tls.Client(conn, cfg)
if err = tlsconn.Handshake(); err != nil {
return nil, err
}
return tlsconn, nil
},
TLSClientConfig: &tls.Config{
InsecureSkipVerify: c.UpstreamInsecure,
NextProtos: []string{"h2"},
},
},
},
}
}
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