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[tor-commits] [pluggable-transports/snowflake] 05/31: Add RelayURL and AllowedRelayPattern to snowflake signaling
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shelikhoo pushed a commit to branch main
in repository pluggable-transports/snowflake.
commit 613ceaf9709e7170cc95c065cbd3ea8a205a04b2
Author: Shelikhoo <xiaokangwang@xxxxxxxxxxx>
AuthorDate: Tue Apr 5 15:03:31 2022 +0100
Add RelayURL and AllowedRelayPattern to snowflake signaling
---
common/messages/messages_test.go | 163 ++++++++++++++++++++++-----------------
common/messages/proxy.go | 64 +++++++++++----
2 files changed, 141 insertions(+), 86 deletions(-)
diff --git a/common/messages/messages_test.go b/common/messages/messages_test.go
index dd1f4fb..d1a5e96 100644
--- a/common/messages/messages_test.go
+++ b/common/messages/messages_test.go
@@ -17,90 +17,103 @@ func TestDecodeProxyPollRequest(t *testing.T) {
clients int
data string
err error
+
+ acceptedRelayPattern string
}{
{
//Version 1.0 proxy message
- "ymbcCMto7KHNGYlp",
- "unknown",
- "unknown",
- 0,
- `{"Sid":"ymbcCMto7KHNGYlp","Version":"1.0"}`,
- nil,
+ sid: "ymbcCMto7KHNGYlp",
+ proxyType: "unknown",
+ natType: "unknown",
+ clients: 0,
+ data: `{"Sid":"ymbcCMto7KHNGYlp","Version":"1.0"}`,
+ err: nil,
},
{
//Version 1.1 proxy message
- "ymbcCMto7KHNGYlp",
- "standalone",
- "unknown",
- 0,
- `{"Sid":"ymbcCMto7KHNGYlp","Version":"1.1","Type":"standalone"}`,
- nil,
+ sid: "ymbcCMto7KHNGYlp",
+ proxyType: "standalone",
+ natType: "unknown",
+ clients: 0,
+ data: `{"Sid":"ymbcCMto7KHNGYlp","Version":"1.1","Type":"standalone"}`,
+ err: nil,
},
{
//Version 1.2 proxy message
- "ymbcCMto7KHNGYlp",
- "standalone",
- "restricted",
- 0,
- `{"Sid":"ymbcCMto7KHNGYlp","Version":"1.2","Type":"standalone", "NAT":"restricted"}`,
- nil,
+ sid: "ymbcCMto7KHNGYlp",
+ proxyType: "standalone",
+ natType: "restricted",
+ clients: 0,
+ data: `{"Sid":"ymbcCMto7KHNGYlp","Version":"1.2","Type":"standalone", "NAT":"restricted"}`,
+ err: nil,
},
{
//Version 1.2 proxy message with clients
- "ymbcCMto7KHNGYlp",
- "standalone",
- "restricted",
- 24,
- `{"Sid":"ymbcCMto7KHNGYlp","Version":"1.2","Type":"standalone", "NAT":"restricted","Clients":24}`,
- nil,
+ sid: "ymbcCMto7KHNGYlp",
+ proxyType: "standalone",
+ natType: "restricted",
+ clients: 24,
+ data: `{"Sid":"ymbcCMto7KHNGYlp","Version":"1.2","Type":"standalone", "NAT":"restricted","Clients":24}`,
+ err: nil,
+ },
+ {
+ //Version 1.3 proxy message with clients and proxyURL
+ sid: "ymbcCMto7KHNGYlp",
+ proxyType: "standalone",
+ natType: "restricted",
+ clients: 24,
+ acceptedRelayPattern: "snowfalke.torproject.org",
+ data: `{"Sid":"ymbcCMto7KHNGYlp","Version":"1.2","Type":"standalone", "NAT":"restricted","Clients":24, "AcceptedRelayPattern":"snowfalke.torproject.org"}`,
+ err: nil,
},
{
//Version 0.X proxy message:
- "",
- "",
- "",
- 0,
- "",
- &json.SyntaxError{},
+ sid: "",
+ proxyType: "",
+ natType: "",
+ clients: 0,
+ data: "",
+ err: &json.SyntaxError{},
},
{
- "",
- "",
- "",
- 0,
- `{"Sid":"ymbcCMto7KHNGYlp"}`,
- fmt.Errorf(""),
+ sid: "",
+ proxyType: "",
+ natType: "",
+ clients: 0,
+ data: `{"Sid":"ymbcCMto7KHNGYlp"}`,
+ err: fmt.Errorf(""),
},
{
- "",
- "",
- "",
- 0,
- "{}",
- fmt.Errorf(""),
+ sid: "",
+ proxyType: "",
+ natType: "",
+ clients: 0,
+ data: "{}",
+ err: fmt.Errorf(""),
},
{
- "",
- "",
- "",
- 0,
- `{"Version":"1.0"}`,
- fmt.Errorf(""),
+ sid: "",
+ proxyType: "",
+ natType: "",
+ clients: 0,
+ data: `{"Version":"1.0"}`,
+ err: fmt.Errorf(""),
},
{
- "",
- "",
- "",
- 0,
- `{"Version":"2.0"}`,
- fmt.Errorf(""),
+ sid: "",
+ proxyType: "",
+ natType: "",
+ clients: 0,
+ data: `{"Version":"2.0"}`,
+ err: fmt.Errorf(""),
},
} {
- sid, proxyType, natType, clients, err := DecodeProxyPollRequest([]byte(test.data))
+ sid, proxyType, natType, clients, relayPattern, err := DecodeProxyPollRequestWithRelayPrefix([]byte(test.data))
So(sid, ShouldResemble, test.sid)
So(proxyType, ShouldResemble, test.proxyType)
So(natType, ShouldResemble, test.natType)
So(clients, ShouldEqual, test.clients)
+ So(relayPattern, ShouldResemble, test.acceptedRelayPattern)
So(err, ShouldHaveSameTypeAs, test.err)
}
@@ -123,34 +136,42 @@ func TestEncodeProxyPollRequests(t *testing.T) {
func TestDecodeProxyPollResponse(t *testing.T) {
Convey("Context", t, func() {
for _, test := range []struct {
- offer string
- data string
- err error
+ offer string
+ data string
+ relayURL string
+ err error
}{
{
- "fake offer",
- `{"Status":"client match","Offer":"fake offer","NAT":"unknown"}`,
- nil,
+ offer: "fake offer",
+ data: `{"Status":"client match","Offer":"fake offer","NAT":"unknown"}`,
+ err: nil,
},
{
- "",
- `{"Status":"no match"}`,
- nil,
+ offer: "fake offer",
+ data: `{"Status":"client match","Offer":"fake offer","NAT":"unknown", "RelayURL":"wss://snowflake.torproject.org/proxy"}`,
+ relayURL: "wss://snowflake.torproject.org/proxy",
+ err: nil,
},
{
- "",
- `{"Status":"client match"}`,
- fmt.Errorf("no supplied offer"),
+ offer: "",
+ data: `{"Status":"no match"}`,
+ err: nil,
},
{
- "",
- `{"Test":"test"}`,
- fmt.Errorf(""),
+ offer: "",
+ data: `{"Status":"client match"}`,
+ err: fmt.Errorf("no supplied offer"),
+ },
+ {
+ offer: "",
+ data: `{"Test":"test"}`,
+ err: fmt.Errorf(""),
},
} {
- offer, _, err := DecodePollResponse([]byte(test.data))
+ offer, _, relayURL, err := DecodePollResponseWithRelayURL([]byte(test.data))
So(err, ShouldHaveSameTypeAs, test.err)
So(offer, ShouldResemble, test.offer)
+ So(relayURL, ShouldResemble, test.relayURL)
}
})
diff --git a/common/messages/proxy.go b/common/messages/proxy.go
index dcfe0ab..d18a7c3 100644
--- a/common/messages/proxy.go
+++ b/common/messages/proxy.go
@@ -5,6 +5,7 @@ package messages
import (
"encoding/json"
+ "errors"
"fmt"
"strings"
@@ -23,6 +24,8 @@ var KnownProxyTypes = map[string]bool{
"iptproxy": true,
}
+var ErrExtraInfo = errors.New("client sent extra info")
+
/* Version 1.2 specification:
== ProxyPollRequest ==
@@ -93,22 +96,39 @@ type ProxyPollRequest struct {
Type string
NAT string
Clients int
+
+ AcceptedRelayPattern string
}
func EncodeProxyPollRequest(sid string, proxyType string, natType string, clients int) ([]byte, error) {
+ return EncodeProxyPollRequestWithRelayPrefix(sid, proxyType, natType, clients, "")
+}
+
+func EncodeProxyPollRequestWithRelayPrefix(sid string, proxyType string, natType string, clients int, relayPattern string) ([]byte, error) {
return json.Marshal(ProxyPollRequest{
- Sid: sid,
- Version: version,
- Type: proxyType,
- NAT: natType,
- Clients: clients,
+ Sid: sid,
+ Version: version,
+ Type: proxyType,
+ NAT: natType,
+ Clients: clients,
+ AcceptedRelayPattern: relayPattern,
})
}
+func DecodeProxyPollRequest(data []byte) (sid string, proxyType string, natType string, clients int, err error) {
+ var relayPrefix string
+ sid, proxyType, natType, clients, relayPrefix, err = DecodeProxyPollRequestWithRelayPrefix(data)
+ if relayPrefix != "" {
+ return "", "", "", 0, ErrExtraInfo
+ }
+ return
+}
+
// Decodes a poll message from a snowflake proxy and returns the
// sid, proxy type, nat type and clients of the proxy on success
// and an error if it failed
-func DecodeProxyPollRequest(data []byte) (sid string, proxyType string, natType string, clients int, err error) {
+func DecodeProxyPollRequestWithRelayPrefix(data []byte) (
+ sid string, proxyType string, natType string, clients int, relayPrefix string, err error) {
var message ProxyPollRequest
err = json.Unmarshal(data, &message)
@@ -145,21 +165,28 @@ func DecodeProxyPollRequest(data []byte) (sid string, proxyType string, natType
message.Type = ProxyUnknown
}
- return message.Sid, message.Type, message.NAT, message.Clients, nil
+ return message.Sid, message.Type, message.NAT, message.Clients, message.AcceptedRelayPattern, nil
}
type ProxyPollResponse struct {
Status string
Offer string
NAT string
+
+ RelayURL string
}
func EncodePollResponse(offer string, success bool, natType string) ([]byte, error) {
+ return EncodePollResponseWithRelayURL(offer, success, natType, "")
+}
+
+func EncodePollResponseWithRelayURL(offer string, success bool, natType, relayURL string) ([]byte, error) {
if success {
return json.Marshal(ProxyPollResponse{
- Status: "client match",
- Offer: offer,
- NAT: natType,
+ Status: "client match",
+ Offer: offer,
+ NAT: natType,
+ RelayURL: relayURL,
})
}
@@ -167,23 +194,30 @@ func EncodePollResponse(offer string, success bool, natType string) ([]byte, err
Status: "no match",
})
}
+func DecodePollResponse(data []byte) (string, string, error) {
+ offer, natType, relayURL, err := DecodePollResponseWithRelayURL(data)
+ if relayURL != "" {
+ return "", "", ErrExtraInfo
+ }
+ return offer, natType, err
+}
// Decodes a poll response from the broker and returns an offer and the client's NAT type
// If there is a client match, the returned offer string will be non-empty
-func DecodePollResponse(data []byte) (string, string, error) {
+func DecodePollResponseWithRelayURL(data []byte) (string, string, string, error) {
var message ProxyPollResponse
err := json.Unmarshal(data, &message)
if err != nil {
- return "", "", err
+ return "", "", "", err
}
if message.Status == "" {
- return "", "", fmt.Errorf("received invalid data")
+ return "", "", "", fmt.Errorf("received invalid data")
}
if message.Status == "client match" {
if message.Offer == "" {
- return "", "", fmt.Errorf("no supplied offer")
+ return "", "", "", fmt.Errorf("no supplied offer")
}
} else {
message.Offer = ""
@@ -194,7 +228,7 @@ func DecodePollResponse(data []byte) (string, string, error) {
natType = "unknown"
}
- return message.Offer, natType, nil
+ return message.Offer, natType, message.RelayURL, nil
}
type ProxyAnswerRequest struct {
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