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crypto_stream_test.go
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crypto_stream_test.go
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package quic
import (
"fmt"
"github.com/xtls/quic-go/internal/protocol"
"github.com/xtls/quic-go/internal/qerr"
"github.com/xtls/quic-go/internal/wire"
. "github.com/onsi/ginkgo/v2"
. "github.com/onsi/gomega"
)
var _ = Describe("Crypto Stream", func() {
var str *cryptoStream
BeforeEach(func() { str = newCryptoStream() })
Context("handling incoming data", func() {
It("handles in-order CRYPTO frames", func() {
Expect(str.HandleCryptoFrame(&wire.CryptoFrame{Data: []byte("foo")})).To(Succeed())
Expect(str.GetCryptoData()).To(Equal([]byte("foo")))
Expect(str.GetCryptoData()).To(BeNil())
Expect(str.HandleCryptoFrame(&wire.CryptoFrame{Data: []byte("bar"), Offset: 3})).To(Succeed())
Expect(str.GetCryptoData()).To(Equal([]byte("bar")))
Expect(str.GetCryptoData()).To(BeNil())
})
It("errors if the frame exceeds the maximum offset", func() {
Expect(str.HandleCryptoFrame(&wire.CryptoFrame{
Offset: protocol.MaxCryptoStreamOffset - 5,
Data: []byte("foobar"),
})).To(MatchError(&qerr.TransportError{
ErrorCode: qerr.CryptoBufferExceeded,
ErrorMessage: fmt.Sprintf("received invalid offset %d on crypto stream, maximum allowed %d", protocol.MaxCryptoStreamOffset+1, protocol.MaxCryptoStreamOffset),
}))
})
It("handles out-of-order CRYPTO frames", func() {
Expect(str.HandleCryptoFrame(&wire.CryptoFrame{Offset: 3, Data: []byte("bar")})).To(Succeed())
Expect(str.HandleCryptoFrame(&wire.CryptoFrame{Data: []byte("foo")})).To(Succeed())
var data []byte
for {
b := str.GetCryptoData()
if b == nil {
break
}
data = append(data, b...)
}
Expect(data).To(Equal([]byte("foobar")))
Expect(str.GetCryptoData()).To(BeNil())
})
Context("finishing", func() {
It("errors if there's still data to read at the current offset after finishing", func() {
Expect(str.HandleCryptoFrame(&wire.CryptoFrame{
Data: []byte("foo"),
})).To(Succeed())
Expect(str.Finish()).To(MatchError(&qerr.TransportError{
ErrorCode: qerr.ProtocolViolation,
ErrorMessage: "encryption level changed, but crypto stream has more data to read",
}))
})
It("errors if there's still data to read at a higher offset after finishing", func() {
Expect(str.HandleCryptoFrame(&wire.CryptoFrame{
Data: []byte("foobar"),
Offset: 10,
})).To(Succeed())
Expect(str.Finish()).To(MatchError(&qerr.TransportError{
ErrorCode: qerr.ProtocolViolation,
ErrorMessage: "encryption level changed, but crypto stream has more data to read",
}))
})
It("works with reordered data", func() {
f1 := &wire.CryptoFrame{
Data: []byte("foo"),
}
f2 := &wire.CryptoFrame{
Offset: 3,
Data: []byte("bar"),
}
Expect(str.HandleCryptoFrame(f2)).To(Succeed())
Expect(str.HandleCryptoFrame(f1)).To(Succeed())
Expect(str.GetCryptoData()).To(HaveLen(3))
Expect(str.GetCryptoData()).To(HaveLen(3))
Expect(str.Finish()).To(Succeed())
Expect(str.HandleCryptoFrame(f2)).To(Succeed())
})
It("rejects new crypto data after finishing", func() {
Expect(str.Finish()).To(Succeed())
Expect(str.HandleCryptoFrame(&wire.CryptoFrame{
Data: []byte("foo"),
})).To(MatchError(&qerr.TransportError{
ErrorCode: qerr.ProtocolViolation,
ErrorMessage: "received crypto data after change of encryption level",
}))
})
It("ignores crypto data below the maximum offset received before finishing", func() {
Expect(str.HandleCryptoFrame(&wire.CryptoFrame{
Data: []byte("foobar"),
})).To(Succeed())
Expect(str.GetCryptoData()).To(Equal([]byte("foobar")))
Expect(str.Finish()).To(Succeed())
Expect(str.HandleCryptoFrame(&wire.CryptoFrame{
Offset: 2,
Data: []byte("foo"),
})).To(Succeed())
})
})
})
Context("writing data", func() {
It("says if it has data", func() {
Expect(str.HasData()).To(BeFalse())
_, err := str.Write([]byte("foobar"))
Expect(err).ToNot(HaveOccurred())
Expect(str.HasData()).To(BeTrue())
})
It("pops crypto frames", func() {
_, err := str.Write([]byte("foobar"))
Expect(err).ToNot(HaveOccurred())
f := str.PopCryptoFrame(1000)
Expect(f).ToNot(BeNil())
Expect(f.Offset).To(BeZero())
Expect(f.Data).To(Equal([]byte("foobar")))
})
It("coalesces multiple writes", func() {
_, err := str.Write([]byte("foo"))
Expect(err).ToNot(HaveOccurred())
_, err = str.Write([]byte("bar"))
Expect(err).ToNot(HaveOccurred())
f := str.PopCryptoFrame(1000)
Expect(f).ToNot(BeNil())
Expect(f.Offset).To(BeZero())
Expect(f.Data).To(Equal([]byte("foobar")))
})
It("respects the maximum size", func() {
frameHeaderLen := (&wire.CryptoFrame{}).Length(protocol.Version1)
_, err := str.Write([]byte("foobar"))
Expect(err).ToNot(HaveOccurred())
f := str.PopCryptoFrame(frameHeaderLen + 3)
Expect(f).ToNot(BeNil())
Expect(f.Offset).To(BeZero())
Expect(f.Data).To(Equal([]byte("foo")))
f = str.PopCryptoFrame(frameHeaderLen + 3)
Expect(f).ToNot(BeNil())
Expect(f.Offset).To(Equal(protocol.ByteCount(3)))
Expect(f.Data).To(Equal([]byte("bar")))
})
})
})