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Rewrite code for new CoreDNS and proxy API

Also changes our API. Closes #9
pull/10/head
Ambrose Chua 2019-09-20 15:01:11 +08:00
parent 19a768ab4c
commit 9974ddb0d2
Signed by: ambrose
GPG Key ID: BC367D33F140B5C2
7 changed files with 742 additions and 173 deletions

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@ -1,6 +1,7 @@
# dns64
The *dns64* plugin implements the DNS64 IPv6 transition mechanism. From Wikipedia:
The `dns64` plugin implements the DNS64 IPv6 transition mechanism. From Wikipedia:
> DNS64 describes a DNS server that when asked for a domain's AAAA records, but only finds
> A records, synthesizes the AAAA records from the A records.
@ -11,62 +12,85 @@ The synthesis in only performed if the query came in via IPv6.
Not all features required by DNS64 are implemented, only basic AAAA synthesis.
* [ ] Support other `proxy` protocols in the configuration file
- Requires writing a custom parser for the proxy plugin
* [ ] Support "mapping of separate IPv4 ranges to separate IPv6 prefixes"
* [ ] Resolve PTR records
* [ ] Follow CNAME records
* [ ] Make resolver DNSSEC aware
## Syntax
## Usage
~~~
> **The syntax has changed since 20 September 2019**. "upstream" has been renamed to proxy
Translate with the well known prefix. Applies to all queries
```
dns64
```
Use a custom prefix
```
dns64 64:1337::/96
# Or
dns64 {
upstream ADDRESS...
prefix IPV6
prefix 64:1337::/96
}
~~~
```
* `upstream` specifies the upstream resolver.
* `prefix` specifies any local IPv6 prefix to use, in addition to the well known
prefix (64:ff9b::/96).
Use a reverse proxy, with a custom prefix
## Examples
In recursive resolver mode:
~~~
# Perform dns64 AAAA synthesizing using 8.8.8.8 for resolving any A
```
dns64 {
upstream 8.8.8.8:53
proxy . 1.1.1.1 1.0.0.1
prefix 64:1337::/96
}
proxy . 8.8.8.8:53
~~~
```
To make DNS64 resolve authoritatively, do:
Enable translation even if an existing AAAA record is present
~~~
```
dns64 {
   upstream localhost:53
   # caveat: additional round trip through networking stack
translateAll
}
file example.com.db
~~~
```
* `prefix` specifies any local IPv6 prefix to use, instead of the well known prefix (64:ff9b::/96)
* `proxy` optionally specifies upstream DNS protocol addresses like the `proxy` plugin
## See Also
<https://en.wikipedia.org/wiki/IPv6_transition_mechanism#DNS64> and RFC 6147.
RFC 6147
## Installation
```console
$ go get github.com/coredns/coredns
$ go get github.com/serverwentdown/dns64
$ cd $GOPATH/src/github.com/coredns/coredns
$ vim plugin.cfg
See [CoreDNS Documentation](https://coredns.io/2017/07/25/compile-time-enabling-or-disabling-plugins/) for more information on how to include this plugin. Here's the summary:
Add to end of file:
proxy:github.com/coredns/proxy
dns64:github.com/serverwentdown/dns64
$ go generate
$ go build
$ ./coredns -plugins | grep dns64
```
package main
import (
_ "github.com/coredns/coredns/core/plugin"
_ "github.com/coredns/proxy"
_ "github.com/serverwentdown/dns64"
"github.com/coredns/coredns/core/dnsserver"
"github.com/coredns/coredns/coremain"
)
var additionalDirectives = []string{
"dns64",
"proxy",
}
func init() {
dnsserver.Directives = append(dnsserver.Directives, additionalDirectives...)
}
func main() {
coremain.Run()
}
```
You might have to copy CoreDNS's `go.mod`

159
dns64.go
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@ -8,7 +8,9 @@ import (
"time"
"github.com/coredns/coredns/plugin"
"github.com/coredns/coredns/plugin/pkg/nonwriter"
"github.com/coredns/coredns/plugin/pkg/response"
"github.com/coredns/coredns/plugin/pkg/upstream"
"github.com/coredns/coredns/request"
"github.com/coredns/proxy"
@ -17,89 +19,81 @@ import (
// DNS64 performs DNS64.
type DNS64 struct {
Next plugin.Handler
Proxy proxy.Proxy
Prefix *net.IPNet
translateAll bool
*proxy.Proxy
NativeUpstream *upstream.Upstream
Next plugin.Handler
Prefix *net.IPNet
TranslateAll bool // Not comply with 5.1.1
}
// ServeDNS implements the plugin.Handler interface.
func (d DNS64) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error) {
drr := &ResponseWriter{d, w}
return d.Next.ServeDNS(ctx, drr, r)
hijackedWriter := &ResponseWriter{w, d, ctx, r}
return d.Next.ServeDNS(ctx, hijackedWriter, r)
}
// Name implements the Handler interface.
func (d DNS64) Name() string { return "dns64" }
// ResponseWriter is a response writer that implements DNS64, when an AAAA query returns
// ResponseWriter is a response writer that implements DNS64, when an AAAA question returns
// NODATA, it will try and fetch any A records and synthesize the AAAA records on the fly.
type ResponseWriter struct {
DNS64
dns.ResponseWriter
DNS64
ctx context.Context
req *dns.Msg
}
// WriteMsg implements the dns.ResponseWriter interface.
func (r *ResponseWriter) WriteMsg(res *dns.Msg) error {
state := request.Request{W: r, Req: res}
// only respond with this when the request came in over IPv6.
if state.Family() == 1 { // if it came in over v4, don't do anything.
// Only respond with this when the request came in over IPv6. This is not mentioned in the RFC
// File an issue if you think we should translate even requests made using IPv4, or have a configuration flag
if state.Family() == 1 { // If it came in over v4, don't do anything.
return r.ResponseWriter.WriteMsg(res)
}
// do not modify if query is not AAAA or not of class IN.
// Do not modify if question is not AAAA or not of class IN. See 5.1
if state.QType() != dns.TypeAAAA || state.QClass() != dns.ClassINET {
return r.ResponseWriter.WriteMsg(res)
}
// do not modify if there are AAAA records or NameError. continue if NoData or any other error.
ty, _ := response.Typify(res, time.Now().UTC())
if ty == response.NoError || ty == response.NameError {
if hasAAAA(res) && !r.translateAll {
// Handle NameError normally. See 5.1.2
if ty == response.NameError {
return r.ResponseWriter.WriteMsg(res)
}
// If results in no error and has AAAA, handle normally. See 5.1.6
if ty == response.NoError {
// TranslateAll will disable this behaviour and translate all queries. See 5.1.1
if hasAAAA(res) && !r.TranslateAll {
return r.ResponseWriter.WriteMsg(res)
}
}
// perform request to upstream.
res2, err := r.Proxy.Lookup(state, state.Name(), dns.TypeA)
// Perform Lookup
var replacement *dns.Msg
var err error
if len(*r.Upstreams) > 0 {
// Use Proxy to lookup
req := new(dns.Msg)
req.SetQuestion(state.Name(), dns.TypeA)
nw := nonwriter.New(state.W)
_, err = r.Proxy.ServeDNS(r.ctx, nw, req)
replacement = nw.Msg
} else {
// Use NativeUpstream to lookup
replacement, err = r.NativeUpstream.Lookup(r.ctx, state, state.Name(), dns.TypeA)
}
if err != nil {
log.Warningf("[WARNING] Unable to query upstream DNS: %v", err)
res.MsgHdr.Rcode = dns.RcodeServerFailure
return r.ResponseWriter.WriteMsg(res)
return err
}
// modify response.
res.MsgHdr.Rcode = dns.RcodeSuccess
nsTtl := uint32(600)
for i := 0; i < len(res.Ns); i++ {
if res.Ns[i].Header().Rrtype == dns.TypeSOA {
nsTtl = res.Ns[i].Header().Ttl
}
}
res.Answer = res2.Answer
for i := 0; i < len(res.Answer); i++ {
ans := res.Answer[i]
hdr := ans.Header()
if hdr.Rrtype == dns.TypeA {
aaaa, _ := To6(r.Prefix, ans.(*dns.A).A)
ttl := nsTtl
if ans.Header().Ttl < ttl {
ttl = ans.Header().Ttl
}
res.Answer[i] = &dns.AAAA{
Hdr: dns.RR_Header{
Name: hdr.Name,
Rrtype: dns.TypeAAAA,
Class: hdr.Class,
Ttl: ttl,
},
AAAA: aaaa,
}
}
}
res.Ns = []dns.RR{}
// Modify response.
r.AnswerRewrite(res, replacement)
return r.ResponseWriter.WriteMsg(res)
}
@ -116,15 +110,64 @@ func (r *ResponseWriter) Hijack() {
return
}
// To6 takes a prefix and IPv4 address and returns an IPv6 address according to RFC 6052.
func To6(prefix *net.IPNet, addr net.IP) (net.IP, error) {
// AnswerRewrite turns A responses into AAAA responses
func (dns64 DNS64) AnswerRewrite(r *dns.Msg, replacement *dns.Msg) {
r.MsgHdr.Rcode = dns.RcodeSuccess
// Extract TTLs
nsTtl := uint32(600) // Default NS record TTL
for i := 0; i < len(r.Ns); i++ {
if r.Ns[i].Header().Rrtype == dns.TypeSOA {
nsTtl = r.Ns[i].Header().Ttl // Use specified NS record TTL
}
}
// Replace all our AAAA answers with A answers
r.Answer = replacement.Answer
for i := 0; i < len(r.Answer); i++ {
ans := r.Answer[i]
hdr := ans.Header()
// All of the answers should be A answers. Ensure that
if hdr.Rrtype == dns.TypeA {
aaaa, _ := to6(dns64.Prefix, ans.(*dns.A).A)
ttl := nsTtl
// Limit the TTL to the NS record TTL
if ans.Header().Ttl < ttl {
ttl = ans.Header().Ttl
}
// Replace A answer with a DNS64 AAAA answer
r.Answer[i] = &dns.AAAA{
Hdr: dns.RR_Header{
Name: hdr.Name,
Rrtype: dns.TypeAAAA,
Class: hdr.Class,
Ttl: ttl,
},
AAAA: aaaa,
}
}
}
// TODO: Explain this
r.Ns = []dns.RR{}
}
// hasAAAA checks if AAAA records exists in dns.Msg
func hasAAAA(res *dns.Msg) bool {
for _, a := range res.Answer {
if a.Header().Rrtype == dns.TypeAAAA {
return true
}
}
return false
}
// to6 takes a prefix and IPv4 address and returns an IPv6 address according to RFC 6052.
func to6(prefix *net.IPNet, addr net.IP) (net.IP, error) {
addr = addr.To4()
if addr == nil {
return nil, errors.New("Not a valid IPv4 address")
}
n, _ := prefix.Mask.Size()
// assumes prefix has been validated during setup
// Assumes prefix has been validated during setup
v6 := make([]byte, 16)
i, j := 0, 0
@ -143,13 +186,3 @@ func To6(prefix *net.IPNet, addr net.IP) (net.IP, error) {
return v6, nil
}
// hasAAAA checks if AAAA records exists in dns.Msg
func hasAAAA(res *dns.Msg) bool {
for _, a := range res.Answer {
if a.Header().Rrtype == dns.TypeAAAA {
return true
}
}
return false
}

View File

@ -10,7 +10,7 @@ func WrapperTo6(prefix, address string) (net.IP, error) {
_, pref, _ := net.ParseCIDR(prefix)
addr := net.ParseIP(address)
v6, err := To6(pref, addr)
v6, err := to6(pref, addr)
return v6, err
}

11
go.mod Normal file
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@ -0,0 +1,11 @@
module github.com/serverwentdown/dns64
go 1.12
require (
github.com/caddyserver/caddy v1.0.3
github.com/coredns/coredns v1.6.3
github.com/coredns/proxy v0.0.0-20190703061257-ce7578ebb7dd
github.com/mholt/caddy v0.11.4
github.com/miekg/dns v1.1.17
)

438
go.sum Normal file
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@ -0,0 +1,438 @@
cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
cloud.google.com/go v0.28.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
cloud.google.com/go v0.41.0/go.mod h1:OauMR7DV8fzvZIl2qg6rkaIhD/vmgk4iwEw/h6ercmg=
github.com/Azure/azure-sdk-for-go v31.1.0+incompatible/go.mod h1:9XXNKU+eRnpl9moKnB4QOLf1HestfXbmab5FXxiDBjc=
github.com/Azure/go-autorest v11.1.2+incompatible/go.mod h1:r+4oMnoxhatjLLJ6zxSWATqVooLgysK6ZNox3g/xq24=
github.com/Azure/go-autorest v13.0.0+incompatible/go.mod h1:r+4oMnoxhatjLLJ6zxSWATqVooLgysK6ZNox3g/xq24=
github.com/Azure/go-autorest/autorest v0.9.0/go.mod h1:xyHB1BMZT0cuDHU7I0+g046+BFDTQ8rEZB0s4Yfa6bI=
github.com/Azure/go-autorest/autorest/adal v0.5.0/go.mod h1:8Z9fGy2MpX0PvDjB1pEgQTmVqjGhiHBW7RJJEciWzS0=
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github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
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github.com/apache/thrift v0.12.0/go.mod h1:cp2SuWMxlEZw2r+iP2GNCdIi4C1qmUzdZFSVb+bacwQ=
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github.com/bgentry/speakeasy v0.1.0/go.mod h1:+zsyZBPWlz7T6j88CTgSN5bM796AkVf0kBD4zp0CCIs=
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github.com/caddyserver/caddy v1.0.3 h1:i9gRhBgvc5ifchwWtSe7pDpsdS9+Q0Rw9oYQmYUTw1w=
github.com/caddyserver/caddy v1.0.3/go.mod h1:G+ouvOY32gENkJC+jhgl62TyhvqEsFaDiZ4uw0RzP1E=
github.com/cenkalti/backoff v2.1.1+incompatible h1:tKJnvO2kl0zmb/jA5UKAt4VoEVw1qxKWjE/Bpp46npY=
github.com/cenkalti/backoff v2.1.1+incompatible/go.mod h1:90ReRw6GdpyfrHakVjL/QHaoyV4aDUVVkXQJJJ3NXXM=
github.com/cheekybits/genny v0.0.0-20170328200008-9127e812e1e9/go.mod h1:+tQajlRqAUrPI7DOSpB0XAqZYtQakVtB7wXkRAgjxjQ=
github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
github.com/cockroachdb/datadriven v0.0.0-20190809214429-80d97fb3cbaa/go.mod h1:zn76sxSg3SzpJ0PPJaLDCu+Bu0Lg3sKTORVIj19EIF8=
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github.com/coredns/coredns v1.6.3/go.mod h1:jFo9+Ty/23oC866Rq0eSJshAZ6g8pYrEfZ4WzkHyEBY=
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github.com/coreos/etcd v3.3.10+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
github.com/coreos/etcd v3.3.11+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
github.com/coreos/go-etcd v2.0.0+incompatible/go.mod h1:Jez6KQU2B/sWsbdaef3ED8NzMklzPG4d5KIOhIy30Tk=
github.com/coreos/go-semver v0.2.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
github.com/coreos/go-systemd v0.0.0-20180511133405-39ca1b05acc7/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
github.com/coreos/go-systemd v0.0.0-20190212144455-93d5ec2c7f76/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
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github.com/coreos/pkg v0.0.0-20180928190104-399ea9e2e55f/go.mod h1:E3G3o1h8I7cfcXa63jLwjI0eiQQMgzzUDFVpN/nH/eA=
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github.com/creack/pty v1.1.7/go.mod h1:lj5s0c3V2DBrqTV7llrYr5NG6My20zk30Fl46Y7DoTY=
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/dgrijalva/jwt-go v0.0.0-20160705203006-01aeca54ebda/go.mod h1:E3ru+11k8xSBh+hMPgOLZmtrrCbhqsmaPHjLKYnJCaQ=
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github.com/dimchansky/utfbom v1.1.0/go.mod h1:rO41eb7gLfo8SF1jd9F8HplJm1Fewwi4mQvIirEdv+8=
github.com/dnstap/golang-dnstap v0.0.0-20170829151710-2cf77a2b5e11 h1:m8nX8hsUghn853BJ5qB0lX+VvS6LTJPksWyILFZRYN4=
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github.com/docker/spdystream v0.0.0-20160310174837-449fdfce4d96/go.mod h1:Qh8CwZgvJUkLughtfhJv5dyTYa91l1fOUCrgjqmcifM=
github.com/dustin/go-humanize v0.0.0-20171111073723-bb3d318650d4/go.mod h1:HtrtbFcZ19U5GC7JDqmcUSB87Iq5E25KnS6fMYU6eOk=
github.com/dustin/go-humanize v1.0.0/go.mod h1:HtrtbFcZ19U5GC7JDqmcUSB87Iq5E25KnS6fMYU6eOk=
github.com/eapache/go-resiliency v1.1.0/go.mod h1:kFI+JgMyC7bLPUVY133qvEBtVayf5mFgVsvEsIPBvNs=
github.com/eapache/go-xerial-snappy v0.0.0-20160609142408-bb955e01b934/go.mod h1:+020luEh2TKB4/GOp8oxxtq0Daoen/Cii55CzbTV6DU=
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github.com/eapache/queue v1.1.0/go.mod h1:6eCeP0CKFpHLu8blIFXhExK/dRa7WDZfr6jVFPTqq+I=
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github.com/fatih/color v1.7.0/go.mod h1:Zm6kSWBoL9eyXnKyktHP6abPY2pDugNf5KwzbycvMj4=
github.com/flynn/go-shlex v0.0.0-20150515145356-3f9db97f8568 h1:BHsljHzVlRcyQhjrss6TZTdY2VfCqZPbv5k3iBFa2ZQ=
github.com/flynn/go-shlex v0.0.0-20150515145356-3f9db97f8568/go.mod h1:xEzjJPgXI435gkrCt3MPfRiAkVrwSbHsst4LCFVfpJc=
github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
github.com/go-acme/lego v2.5.0+incompatible h1:5fNN9yRQfv8ymH3DSsxla+4aYeQt2IgfZqHKVnK8f0s=
github.com/go-acme/lego v2.5.0+incompatible/go.mod h1:yzMNe9CasVUhkquNvti5nAtPmG94USbYxYrZfTkIn0M=
github.com/go-ini/ini v1.37.0/go.mod h1:ByCAeIL28uOIIG0E3PJtZPDL8WnHpFKFOtgjp+3Ies8=
github.com/go-kit/kit v0.8.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as=
github.com/go-logfmt/logfmt v0.3.0/go.mod h1:Qt1PoO58o5twSAckw1HlFXLmHsOX5/0LbT9GBnD5lWE=
github.com/go-logfmt/logfmt v0.4.0/go.mod h1:3RMwSq7FuexP4Kalkev3ejPJsZTpXXBr9+V4qmtdjCk=
github.com/go-logr/logr v0.1.0/go.mod h1:ixOQHD9gLJUVQQ2ZOR7zLEifBX6tGkNJF4QyIY7sIas=
github.com/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY=
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github.com/gogo/protobuf v1.2.1/go.mod h1:hp+jE20tsWTFYpLwKvXlhS1hjn+gTNwPg2I6zVXpSg4=
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github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
github.com/golang/mock v1.2.0/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
github.com/golang/mock v1.3.1/go.mod h1:sBzyDLLjw3U8JLTeZvSv8jJB+tU5PVekmnlKIyFUx0Y=
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github.com/golang/protobuf v1.3.2 h1:6nsPYzhq5kReh6QImI3k5qWzO4PEbvbIW2cwSfR/6xs=
github.com/golang/protobuf v1.3.2/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
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github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
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github.com/google/uuid v1.0.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
github.com/google/uuid v1.1.1 h1:Gkbcsh/GbpXz7lPftLA3P6TYMwjCLYm83jiFQZF/3gY=
github.com/google/uuid v1.1.1/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
github.com/googleapis/gax-go/v2 v2.0.4/go.mod h1:0Wqv26UfaUD9n4G6kQubkQ+KchISgw+vpHVxEJEs9eg=
github.com/googleapis/gax-go/v2 v2.0.5/go.mod h1:DWXyrwAJ9X0FpwwEdw+IPEYBICEFu5mhpdKc/us6bOk=
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github.com/googleapis/gnostic v0.2.0/go.mod h1:sJBsCZ4ayReDTBIg8b9dl28c5xFWyhBTVRp3pOg5EKY=
github.com/gophercloud/gophercloud v0.0.0-20180928224355-bfc006765209/go.mod h1:3WdhXV3rUYy9p6AUW8d94kr+HS62Y4VL9mBnFxsD8q4=
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github.com/gorilla/websocket v1.4.0/go.mod h1:E7qHFY5m1UJ88s3WnNqhKjPHQ0heANvMoAMk2YaljkQ=
github.com/gregjones/httpcache v0.0.0-20170728041850-787624de3eb7/go.mod h1:FecbI9+v66THATjSRHfNgh1IVFe/9kFxbXtjV0ctIMA=
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github.com/hashicorp/go-syslog v1.0.0/go.mod h1:qPfqrKkXGihmCqbJM2mZgkZGvKG1dFdvsLplgctolz4=
github.com/hashicorp/golang-lru v0.0.0-20180201235237-0fb14efe8c47/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=
github.com/hashicorp/golang-lru v0.5.0/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=
github.com/hashicorp/golang-lru v0.5.1/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=
github.com/hashicorp/hcl v1.0.0/go.mod h1:E5yfLk+7swimpb2L/Alb/PJmXilQ/rhwaUYs4T20WEQ=
github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU=
github.com/imdario/mergo v0.3.5/go.mod h1:2EnlNZ0deacrJVfApfmtdGgDfMuh/nq6Ok1EcJh5FfA=
github.com/imdario/mergo v0.3.7/go.mod h1:2EnlNZ0deacrJVfApfmtdGgDfMuh/nq6Ok1EcJh5FfA=
github.com/inconshreveable/mousetrap v1.0.0/go.mod h1:PxqpIevigyE2G7u3NXJIT2ANytuPF1OarO4DADm73n8=
github.com/jimstudt/http-authentication v0.0.0-20140401203705-3eca13d6893a/go.mod h1:wK6yTYYcgjHE1Z1QtXACPDjcFJyBskHEdagmnq3vsP8=
github.com/jmespath/go-jmespath v0.0.0-20160202185014-0b12d6b521d8/go.mod h1:Nht3zPeWKUH0NzdCt2Blrr5ys8VGpn0CEB0cQHVjt7k=
github.com/jmespath/go-jmespath v0.0.0-20180206201540-c2b33e8439af/go.mod h1:Nht3zPeWKUH0NzdCt2Blrr5ys8VGpn0CEB0cQHVjt7k=
github.com/jonboulle/clockwork v0.1.0/go.mod h1:Ii8DK3G1RaLaWxj9trq07+26W01tbo22gdxWY5EU2bo=
github.com/json-iterator/go v0.0.0-20180701071628-ab8a2e0c74be/go.mod h1:+SdeFBvtyEkXs7REEP0seUULqWtbJapLOCVDaaPEHmU=
github.com/json-iterator/go v1.1.6/go.mod h1:+SdeFBvtyEkXs7REEP0seUULqWtbJapLOCVDaaPEHmU=
github.com/json-iterator/go v1.1.7/go.mod h1:KdQUCv79m/52Kvf8AW2vK1V8akMuk1QjK/uOdHXbAo4=
github.com/jstemmer/go-junit-report v0.0.0-20190106144839-af01ea7f8024/go.mod h1:6v2b51hI/fHJwM22ozAgKL4VKDeJcHhJFhtBdhmNjmU=
github.com/julienschmidt/httprouter v1.2.0/go.mod h1:SYymIcj16QtmaHHD7aYtjjsJG7VTCxuUUipMqKk8s4w=
github.com/kisielk/errcheck v1.1.0/go.mod h1:EZBBE59ingxPouuu3KfxchcWSUPOHkagtvWXihfKN4Q=
github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck=
github.com/klauspost/cpuid v1.2.0 h1:NMpwD2G9JSFOE1/TJjGSo5zG7Yb2bTe7eq1jH+irmeE=
github.com/klauspost/cpuid v1.2.0/go.mod h1:Pj4uuM528wm8OyEC2QMXAi2YiTZ96dNQPGgoMS4s3ek=
github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
github.com/konsorten/go-windows-terminal-sequences v1.0.2/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
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github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
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/kylelemons/godebug v0.0.0-20170820004349-d65d576e9348/go.mod h1:B69LEHPfb2qLo0BaaOLcbitczOKLWTsrBG9LczfCD4k=
github.com/lucas-clemente/aes12 v0.0.0-20171027163421-cd47fb39b79f/go.mod h1:JpH9J1c9oX6otFSgdUHwUBUizmKlrMjxWnIAjff4m04=
github.com/lucas-clemente/quic-clients v0.1.0/go.mod h1:y5xVIEoObKqULIKivu+gD/LU90pL73bTdtQjPBvtCBk=
github.com/lucas-clemente/quic-go v0.10.2/go.mod h1:hvaRS9IHjFLMq76puFJeWNfmn+H70QZ/CXoxqw9bzao=
github.com/lucas-clemente/quic-go-certificates v0.0.0-20160823095156-d2f86524cced/go.mod h1:NCcRLrOTZbzhZvixZLlERbJtDtYsmMw8Jc4vS8Z0g58=
github.com/magiconair/properties v1.8.0/go.mod h1:PppfXfuXeibc/6YijjN8zIbojt8czPbwD3XqdrwzmxQ=
github.com/marten-seemann/qtls v0.2.3/go.mod h1:xzjG7avBwGGbdZ8dTGxlBnLArsVKLvwmjgmPuiQEcYk=
github.com/mattn/go-colorable v0.0.9/go.mod h1:9vuHe8Xs5qXnSaW/c/ABM9alt+Vo+STaOChaDxuIBZU=
github.com/mattn/go-isatty v0.0.4/go.mod h1:M+lRXTBqGeGNdLjl/ufCoiOlB5xdOkqRJdNxMWT7Zi4=
github.com/mattn/go-runewidth v0.0.2/go.mod h1:LwmH8dsx7+W8Uxz3IHJYH5QSwggIsqBzpuz5H//U1FU=
github.com/matttproud/golang_protobuf_extensions v1.0.1 h1:4hp9jkHxhMHkqkrB3Ix0jegS5sx/RkqARlsWZ6pIwiU=
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github.com/mholt/caddy v0.11.4 h1:he7Ej5Jf9CXjETtfQQBr5KJ1b5ZWdPaBOJjiQs6LAIk=
github.com/mholt/caddy v0.11.4/go.mod h1:Wb1PlT4DAYSqOEd03MsqkdkXnTxA8v9pKjdpxbqM1kY=
github.com/mholt/certmagic v0.6.2-0.20190624175158-6a42ef9fe8c2 h1:xKE9kZ5C8gelJC3+BNM6LJs1x21rivK7yxfTZMAuY2s=
github.com/mholt/certmagic v0.6.2-0.20190624175158-6a42ef9fe8c2/go.mod h1:g4cOPxcjV0oFq3qwpjSA30LReKD8AoIfwAY9VvG35NY=
github.com/miekg/dns v1.1.3/go.mod h1:W1PPwlIAgtquWBMBEV9nkV9Cazfe8ScdGz/Lj7v3Nrg=
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github.com/miekg/dns v1.1.16/go.mod h1:YNV562EiewvSmpCB6/W4c6yqjK7Z+M/aIS1JHsIVeg8=
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github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
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golang.org/x/crypto v0.0.0-20180621125126-a49355c7e3f8/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
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golang.org/x/crypto v0.0.0-20181203042331-505ab145d0a9/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
golang.org/x/crypto v0.0.0-20190123085648-057139ce5d2b/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
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golang.org/x/crypto v0.0.0-20190228161510-8dd112bcdc25/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
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golang.org/x/crypto v0.0.0-20190605123033-f99c8df09eb5/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
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golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
golang.org/x/exp v0.0.0-20190510132918-efd6b22b2522/go.mod h1:ZjyILWgesfNpC6sMxTJOJm9Kp84zZh5NQWvqDGG3Qr8=
golang.org/x/image v0.0.0-20190227222117-0694c2d4d067/go.mod h1:kZ7UVZpmo3dzQBMxlp+ypCbDeSB+sBbTgSJuh5dn5js=
golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
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golang.org/x/net v0.0.0-20190501004415-9ce7a6920f09/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
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k8s.io/kube-openapi v0.0.0-20190228160746-b3a7cee44a30/go.mod h1:BXM9ceUBTj2QnfH2MK1odQs778ajze1RxcmP6S8RVVc=
k8s.io/kube-openapi v0.0.0-20190306001800-15615b16d372/go.mod h1:BXM9ceUBTj2QnfH2MK1odQs778ajze1RxcmP6S8RVVc=
k8s.io/utils v0.0.0-20190221042446-c2654d5206da/go.mod h1:8k8uAuAQ0rXslZKaEWd0c3oVhZz7sSzSiPnVZayjIX0=
k8s.io/utils v0.0.0-20190529001817-6999998975a7/go.mod h1:sZAwmy6armz5eXlNoLmJcl4F1QuKu7sr+mFQ0byX7Ew=
rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=

119
setup.go
View File

@ -2,15 +2,16 @@ package dns64
import (
"net"
"strconv"
"github.com/coredns/proxy"
"github.com/coredns/coredns/core/dnsserver"
"github.com/coredns/coredns/plugin"
clog "github.com/coredns/coredns/plugin/pkg/log"
"github.com/coredns/coredns/plugin/pkg/parse"
"github.com/coredns/proxy"
"github.com/coredns/coredns/plugin/pkg/upstream"
"github.com/mholt/caddy"
"github.com/caddyserver/caddy"
"github.com/caddyserver/caddy/caddyfile"
)
var log = clog.NewWithPlugin("dns64")
@ -23,71 +24,113 @@ func init() {
}
func setup(c *caddy.Controller) error {
prxy, pref, translateAll, err := dns64Parse(c)
dns64, err := dns64Parse(&c.Dispenser)
if err != nil {
return plugin.Error("dns64", err)
}
t := dnsserver.GetConfig(c).Handler("trace")
dns64.Trace = t
dnsserver.GetConfig(c).AddPlugin(func(next plugin.Handler) plugin.Handler {
return DNS64{Next: next, Proxy: prxy, Prefix: pref, translateAll: translateAll}
dns64.Next = next
return dns64
})
for i := range *dns64.Upstreams {
u := (*dns64.Upstreams)[i]
c.OnStartup(func() error {
return u.Exchanger().OnStartup(dns64.Proxy)
})
c.OnShutdown(func() error {
return u.Exchanger().OnShutdown(dns64.Proxy)
})
// Register shutdown handlers.
c.OnShutdown(u.Stop)
}
return nil
}
func dns64Parse(c *caddy.Controller) (proxy.Proxy, *net.IPNet, bool, error) {
prxy := proxy.Proxy{}
_, pref, _ := net.ParseCIDR("64:ff9b::/96")
translateAll := false
func dns64Parse(c *caddyfile.Dispenser) (DNS64, error) {
_, defaultPref, _ := net.ParseCIDR("64:ff9b::/96")
dns64 := DNS64{
Proxy: &proxy.Proxy{
Upstreams: &[]proxy.Upstream{},
},
NativeUpstream: upstream.New(),
Prefix: defaultPref,
TranslateAll: false,
}
for c.Next() {
args := c.RemainingArgs()
if len(args) == 1 {
pref, err := parsePrefix(c, args[0])
if err != nil {
return dns64, err
}
dns64.Prefix = pref
continue
}
if len(args) > 0 {
return prxy, pref, translateAll, c.ArgErr()
return dns64, c.ArgErr()
}
for c.NextBlock() {
switch c.Val() {
case "upstream":
case "proxy":
// Fake proxy arguments. Need a better solution
args := c.RemainingArgs()
if len(args) == 0 {
return prxy, pref, translateAll, c.ArgErr()
fakeTokens := []caddyfile.Token{}
for _, arg := range args {
fakeTokens = append(fakeTokens, caddyfile.Token{
File: c.File(),
Line: c.Line(),
Text: arg,
})
}
ups, err := parse.HostPortOrFile(args...)
fakeDispenser := caddyfile.NewDispenserTokens(c.File(), fakeTokens)
u, err := proxy.NewStaticUpstream(&fakeDispenser)
if err != nil {
return prxy, pref, translateAll, err
return dns64, err
}
prxy = proxy.NewLookup(ups)
log.Infof("Upstream %v", ups)
*dns64.Upstreams = append(*dns64.Upstreams, u)
case "prefix":
if !c.NextArg() {
return prxy, pref, translateAll, c.ArgErr()
}
var err error
_, pref, err = net.ParseCIDR(c.Val())
// test for valid prefix
n, total := pref.Mask.Size()
if total != 128 {
return prxy, pref, translateAll, c.Errf("'%s' not a valid IPv6 address", pref)
}
if n%8 != 0 || n < 32 || n > 96 {
return prxy, pref, translateAll, c.Errf("'%s' not a valid prefix length", pref)
return dns64, c.ArgErr()
}
pref, err := parsePrefix(c, c.Val())
if err != nil {
return prxy, pref, translateAll, err
return dns64, err
}
log.Infof("Prefix %v", pref)
dns64.Prefix = pref
case "translateAll":
args := c.RemainingArgs()
if len(args) > 0 {
translateAll, _ = strconv.ParseBool(args[0])
}
dns64.TranslateAll = true
default:
return prxy, pref, translateAll, c.Errf("unknown property '%s'", c.Val())
return dns64, c.Errf("unknown property '%s'", c.Val())
}
}
}
return prxy, pref, translateAll, nil
return dns64, nil
}
func parsePrefix(c *caddyfile.Dispenser, addr string) (*net.IPNet, error) {
_, pref, err := net.ParseCIDR(addr)
if err != nil {
return nil, err
}
// Test for valid prefix
n, total := pref.Mask.Size()
if total != 128 {
return nil, c.Errf("'%s' not a valid IPv6 address", pref)
}
if n%8 != 0 || n < 32 || n > 96 {
return nil, c.Errf("'%s' not a valid prefix length", pref)
}
return pref, nil
}

View File

@ -3,7 +3,7 @@ package dns64
import (
"testing"
"github.com/mholt/caddy"
"github.com/caddyserver/caddy"
)
func TestSetupDns64(t *testing.T) {
@ -17,91 +17,111 @@ func TestSetupDns64(t *testing.T) {
false,
"64:ff9b::/96",
},
{
`dns64 64:dead::/96`,
false,
"64:dead::/96",
},
{
`dns64 {
upstream 8.8.8.8
}`,
translateAll
}`,
false,
"64:ff9b::/96",
},
{
`dns64 {
prefix 64:ff9b::/96
}`,
translateAll
proxy . 8.8.8.8
}`,
false,
"64:ff9b::/96",
},
{
`dns64 {
prefix 64:ff9b::/32
}`,
proxy . 8.8.8.8
}`,
false,
"64:ff9b::/96",
},
{
`dns64 {
prefix 64:ff9b::/96
}`,
false,
"64:ff9b::/96",
},
{
`dns64 {
prefix 64:ff9b::/32
}`,
false,
"64:ff9b::/32",
},
{
`dns64 {
prefix 64:ff9b::/52
}`,
prefix 64:ff9b::/52
}`,
true,
"64:ff9b::/52",
},
{
`dns64 {
prefix 64:ff9b::/104
}`,
prefix 64:ff9b::/104
}`,
true,
"64:ff9b::/104",
},
{
`dns64 {
prefix 8.8.8.8/24
}`,
prefix 8.8.8.8/24
}`,
true,
"8.8.9.9/24",
},
{
`dns64 {
upstream 8.8.8.8 8.8.4.4
}`,
proxy . 8.8.8.8 8.8.4.4
}`,
false,
"64:ff9b::/96",
},
{
`dns64 {
upstream some_not_useable_domain
}`,
proxy . some_not_useable_domain
}`,
true,
"64:ff9b::/96",
},
{
`dns64 {
prefix 64:ff9b::/96
upstream 8.8.8.8
}`,
prefix 64:ff9b::/96
proxy . 8.8.8.8
}`,
false,
"64:ff9b::/96",
},
{
`dns64 {
prefix 2002:ac12:b083::/96
upstream 8.8.8.8
}`,
prefix 2002:ac12:b083::/96
proxy . 8.8.8.8
}`,
false,
"2002:ac12:b083::/96",
},
{
`dns64 {
prefix 2002:c0a8:a88a::/48
upstream 8.8.8.8
}`,
prefix 2002:c0a8:a88a::/48
proxy . 8.8.8.8
}`,
false,
"2002:c0a8:a88a::/48",
},
{
`dns64 foobar {
prefix 64:ff9b::/96
upstream 8.8.8.8
}`,
prefix 64:ff9b::/96
proxy . 8.8.8.8
}`,
true,
"64:ff9b::/96",
},
@ -112,8 +132,8 @@ func TestSetupDns64(t *testing.T) {
},
{
`dns64 {
foobar
}`,
foobar
}`,
true,
"64:ff9b::/96",
},
@ -121,13 +141,13 @@ func TestSetupDns64(t *testing.T) {
for i, test := range tests {
c := caddy.NewTestController("dns", test.inputUpstreams)
_, pref, err := dns64Parse(c)
dns64, err := dns64Parse(&c.Dispenser)
if (err != nil) != test.shouldErr {
t.Errorf("Test %d expected %v error, got %v for %s", i+1, test.shouldErr, err, test.inputUpstreams)
}
if err == nil {
if pref.String() != test.prefix {
t.Errorf("Test %d expected prefix %s, got %v", i+1, test.prefix, pref.String())
if dns64.Prefix.String() != test.prefix {
t.Errorf("Test %d expected prefix %s, got %v", i+1, test.prefix, dns64.Prefix.String())
}
}
}