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// SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
// SPDX-License-Identifier: MIT
package dtls
import (
"testing"
"time"
"github.com/pion/dtls/v3/pkg/protocol"
"github.com/pion/dtls/v3/pkg/protocol/extension"
"github.com/pion/dtls/v3/pkg/protocol/handshake"
"github.com/pion/dtls/v3/pkg/protocol/recordlayer"
"github.com/stretchr/testify/assert"
)
func TestRandomConnectionIDGenerator(t *testing.T) {
cases := map[string]struct {
reason string
size int
}{
"LengthMatch": {
reason: "Zero size should match length of generated CID.",
size: 0,
},
"LengthMatchSome": {
reason: "Non-zero size should match length of generated CID with non-zero.",
size: 8,
},
}
for name, tc := range cases {
t.Run(name, func(t *testing.T) {
assert.Equal(t, tc.size, len(RandomCIDGenerator(tc.size)()), "%s\nRandomCIDGenerator mismatch", tc.reason)
})
}
}
func TestOnlySendCIDGenerator(t *testing.T) {
cases := map[string]struct {
reason string
}{
"LengthMatch": {
reason: "CID length should always be zero.",
},
}
for name, tc := range cases {
t.Run(name, func(t *testing.T) {
assert.Equalf(t, 0, len(OnlySendCIDGenerator()()), "%s\nOnlySendCIDGenerator mismatch", tc.reason)
})
}
}
func TestCIDDatagramRouter(t *testing.T) {
cid := []byte("abcd1234")
cidLen := 8
appRecord, err := (&recordlayer.RecordLayer{
Header: recordlayer.Header{
Epoch: 1,
Version: protocol.Version1_2,
},
Content: &protocol.ApplicationData{
Data: []byte("application data"),
},
}).Marshal()
assert.NoError(t, err)
appData, err := (&protocol.ApplicationData{
Data: []byte("some data"),
}).Marshal()
assert.NoError(t, err)
inner, err := (&recordlayer.InnerPlaintext{
Content: appData,
RealType: protocol.ContentTypeApplicationData,
}).Marshal()
assert.NoError(t, err)
cidHeader, err := (&recordlayer.Header{
Epoch: 1,
Version: protocol.Version1_2,
ContentType: protocol.ContentTypeConnectionID,
ContentLen: uint16(len(inner)), //nolint:gosec // G115
ConnectionID: cid,
SequenceNumber: 1,
}).Marshal()
assert.NoError(t, err)
cases := map[string]struct {
reason string
size int
datagram []byte
ok bool
want string
}{
"EmptyDatagram": {
reason: "If datagram is empty, we cannot extract an identifier",
size: cidLen,
datagram: []byte{},
ok: false,
want: "",
},
"NotADTLSRecord": {
reason: "If datagram is not a DTLS record, we cannot extract an identifier",
size: cidLen,
datagram: []byte("not a DTLS record"),
ok: false,
want: "",
},
"NotAConnectionIDDatagram": {
reason: "If datagram does not contain any Connection ID records, we cannot extract an identifier",
size: cidLen,
datagram: appRecord,
ok: false,
want: "",
},
"OneRecordConnectionID": {
reason: "If datagram contains one Connection ID record, we should be able to extract it.",
size: cidLen,
datagram: append(cidHeader, inner...),
ok: true,
want: string(cid),
},
"OneRecordConnectionIDAltLength": {
//nolint:lll
reason: "If datagram contains one Connection ID record, but it has the wrong length we should not be able to extract it.",
size: cidLen,
datagram: func() []byte {
altCIDHeader, err := (&recordlayer.Header{
Epoch: 1,
Version: protocol.Version1_2,
ContentType: protocol.ContentTypeConnectionID,
ContentLen: uint16(len(inner)), //nolint:gosec // G115
ConnectionID: []byte("abcd"),
SequenceNumber: 1,
}).Marshal()
assert.NoError(t, err)
return append(altCIDHeader, inner...)
}(),
ok: false,
want: "",
},
"MultipleRecordOneConnectionID": {
//nolint:lll
reason: "If datagram contains multiple records and one is a Connection ID record, we should be able to extract it.",
size: 8,
datagram: append(append(appRecord, cidHeader...), inner...),
ok: true,
want: string(cid),
},
"MultipleRecordMultipleConnectionID": {
//nolint:lll
reason: "If datagram contains multiple records and multiple are Connection ID records, we should extract the first one.",
size: 8,
datagram: append(append(append(appRecord, func() []byte {
altCIDHeader, err := (&recordlayer.Header{
Epoch: 1,
Version: protocol.Version1_2,
ContentType: protocol.ContentTypeConnectionID,
ContentLen: uint16(len(inner)), //nolint:gosec // G115
ConnectionID: []byte("1234abcd"),
SequenceNumber: 1,
}).Marshal()
assert.NoError(t, err)
return append(altCIDHeader, inner...)
}()...), cidHeader...), inner...),
ok: true,
want: "1234abcd",
},
}
for name, tc := range cases {
t.Run(name, func(t *testing.T) {
cid, ok := cidDatagramRouter(tc.size)(tc.datagram)
assert.Equal(t, tc.ok, ok, "%s\ncidDatagramRouter mismatch", tc.reason)
assert.Equal(t, tc.want, cid, "%s\ncidDatagramRouter mismatch", tc.reason)
})
}
}
func TestCIDConnIdentifier(t *testing.T) {
cid := []byte("abcd1234")
cs := uint16(TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256)
sh, err := (&recordlayer.RecordLayer{
Header: recordlayer.Header{
Epoch: 0,
Version: protocol.Version1_2,
},
Content: &handshake.Handshake{
Message: &handshake.MessageServerHello{
Version: protocol.Version1_2,
Random: handshake.Random{GMTUnixTime: time.Unix(500, 0), RandomBytes: [28]byte{}},
SessionID: []byte("hello"),
CipherSuiteID: &cs,
CompressionMethod: defaultCompressionMethods()[0],
Extensions: []extension.Extension{
&extension.ConnectionID{
CID: cid,
},
},
},
},
}).Marshal()
assert.NoError(t, err)
appRecord, err := (&recordlayer.RecordLayer{
Header: recordlayer.Header{
Epoch: 1,
Version: protocol.Version1_2,
},
Content: &protocol.ApplicationData{
Data: []byte("application data"),
},
}).Marshal()
assert.NoError(t, err)
cases := map[string]struct {
reason string
datagram []byte
ok bool
want string
}{
"EmptyDatagram": {
reason: "If datagram is empty, we cannot extract an identifier",
datagram: []byte{},
ok: false,
want: "",
},
"NotADTLSRecord": {
reason: "If datagram is not a DTLS record, we cannot extract an identifier",
datagram: []byte("not a DTLS record"),
ok: false,
want: "",
},
"NotAServerhelloDatagram": {
reason: "If datagram does not contain any ServerHello record, we cannot extract an identifier",
datagram: appRecord,
ok: false,
want: "",
},
"OneRecordServerHello": {
reason: "If datagram contains one ServerHello record, we should be able to extract an identifier.",
datagram: sh,
ok: true,
want: string(cid),
},
"MultipleRecordFirstServerHello": {
//nolint:lll
reason: "If datagram contains multiple records and the first is a ServerHello record, we should be able to extract an identifier.",
datagram: append(sh, appRecord...),
ok: true,
want: string(cid),
},
"MultipleRecordNotFirstServerHello": {
//nolint:lll
reason: "If datagram contains multiple records and the first is not a ServerHello record, we should not be able to extract an identifier.",
datagram: append(appRecord, sh...),
ok: false,
want: "",
},
}
for name, tc := range cases {
t.Run(name, func(t *testing.T) {
cid, ok := cidConnIdentifier()(tc.datagram)
assert.Equalf(t, tc.ok, ok, "%s\ncidConnIdentifier mismatch", tc.reason)
assert.Equalf(t, tc.want, cid, "%s\ncidConnIdentifier mismatch", tc.reason)
})
}
}
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