github.com/tumi8/quic-go@v0.37.4-tum/noninternal/wire/version_negotiation_test.go (about)

     1  package wire
     2  
     3  import (
     4  	"encoding/binary"
     5  
     6  	"golang.org/x/exp/rand"
     7  
     8  	"github.com/tumi8/quic-go/noninternal/protocol"
     9  	. "github.com/onsi/ginkgo/v2"
    10  	. "github.com/onsi/gomega"
    11  )
    12  
    13  var _ = Describe("Version Negotiation Packets", func() {
    14  	randConnID := func(l int) protocol.ArbitraryLenConnectionID {
    15  		b := make(protocol.ArbitraryLenConnectionID, l)
    16  		_, err := rand.Read(b)
    17  		Expect(err).ToNot(HaveOccurred())
    18  		return b
    19  	}
    20  
    21  	It("parses a Version Negotiation packet", func() {
    22  		srcConnID := randConnID(rand.Intn(255) + 1)
    23  		destConnID := randConnID(rand.Intn(255) + 1)
    24  		versions := []protocol.VersionNumber{0x22334455, 0x33445566}
    25  		data := []byte{0x80, 0, 0, 0, 0}
    26  		data = append(data, uint8(len(destConnID)))
    27  		data = append(data, destConnID...)
    28  		data = append(data, uint8(len(srcConnID)))
    29  		data = append(data, srcConnID...)
    30  		for _, v := range versions {
    31  			data = append(data, []byte{0, 0, 0, 0}...)
    32  			binary.BigEndian.PutUint32(data[len(data)-4:], uint32(v))
    33  		}
    34  		Expect(IsVersionNegotiationPacket(data)).To(BeTrue())
    35  		dest, src, supportedVersions, err := ParseVersionNegotiationPacket(data)
    36  		Expect(err).ToNot(HaveOccurred())
    37  		Expect(dest).To(Equal(destConnID))
    38  		Expect(src).To(Equal(srcConnID))
    39  		Expect(supportedVersions).To(Equal(versions))
    40  	})
    41  
    42  	It("errors if it contains versions of the wrong length", func() {
    43  		connID := protocol.ArbitraryLenConnectionID{1, 2, 3, 4, 5, 6, 7, 8}
    44  		versions := []protocol.VersionNumber{0x22334455, 0x33445566}
    45  		data := ComposeVersionNegotiation(connID, connID, versions)
    46  		_, _, _, err := ParseVersionNegotiationPacket(data[:len(data)-2])
    47  		Expect(err).To(MatchError("Version Negotiation packet has a version list with an invalid length"))
    48  	})
    49  
    50  	It("errors if the version list is empty", func() {
    51  		connID := protocol.ArbitraryLenConnectionID{1, 2, 3, 4, 5, 6, 7, 8}
    52  		versions := []protocol.VersionNumber{0x22334455}
    53  		data := ComposeVersionNegotiation(connID, connID, versions)
    54  		// remove 8 bytes (two versions), since ComposeVersionNegotiation also added a reserved version number
    55  		data = data[:len(data)-8]
    56  		_, _, _, err := ParseVersionNegotiationPacket(data)
    57  		Expect(err).To(MatchError("Version Negotiation packet has empty version list"))
    58  	})
    59  
    60  	It("adds a reserved version", func() {
    61  		srcConnID := protocol.ArbitraryLenConnectionID{0xde, 0xad, 0xbe, 0xef, 0xca, 0xfe, 0x13, 0x37}
    62  		destConnID := protocol.ArbitraryLenConnectionID{1, 2, 3, 4, 5, 6, 7, 8}
    63  		versions := []protocol.VersionNumber{1001, 1003}
    64  		data := ComposeVersionNegotiation(destConnID, srcConnID, versions)
    65  		Expect(IsLongHeaderPacket(data[0])).To(BeTrue())
    66  		v, err := ParseVersion(data)
    67  		Expect(err).ToNot(HaveOccurred())
    68  		Expect(v).To(BeZero())
    69  		dest, src, supportedVersions, err := ParseVersionNegotiationPacket(data)
    70  		Expect(err).ToNot(HaveOccurred())
    71  		Expect(dest).To(Equal(destConnID))
    72  		Expect(src).To(Equal(srcConnID))
    73  		// the supported versions should include one reserved version number
    74  		Expect(supportedVersions).To(HaveLen(len(versions) + 1))
    75  		for _, v := range versions {
    76  			Expect(supportedVersions).To(ContainElement(v))
    77  		}
    78  		var reservedVersion protocol.VersionNumber
    79  	versionLoop:
    80  		for _, ver := range supportedVersions {
    81  			for _, v := range versions {
    82  				if v == ver {
    83  					continue versionLoop
    84  				}
    85  			}
    86  			reservedVersion = ver
    87  		}
    88  		Expect(reservedVersion).ToNot(BeZero())
    89  		Expect(reservedVersion&0x0f0f0f0f == 0x0a0a0a0a).To(BeTrue()) // check that it's a greased version number
    90  	})
    91  })