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capsule_test.go
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package connectip
import (
"bytes"
"io"
"net/netip"
"testing"
"github.com/quic-go/quic-go/http3"
"github.com/quic-go/quic-go/quicvarint"
"github.com/stretchr/testify/require"
)
func TestParseAddressAssignCapsule(t *testing.T) {
addr1 := quicvarint.Append(nil, 1337) // Request ID
addr1 = append(addr1, 4) // IPv4
addr1 = append(addr1, netip.AddrFrom4([4]byte{1, 2, 3, 0}).AsSlice()...)
addr1 = append(addr1, 24) // IP Prefix Length
addr2 := quicvarint.Append(nil, 1338) // Request ID
addr2 = append(addr2, 6) // IPv6
addr2 = append(addr2, netip.MustParseAddr("2001:db8::1").AsSlice()...)
addr2 = append(addr2, 128) // IP Prefix Length
data := quicvarint.Append(nil, uint64(capsuleTypeAddressAssign))
data = quicvarint.Append(data, uint64(len(addr1)+len(addr2))) // Length
data = append(data, addr1...)
data = append(data, addr2...)
r := bytes.NewReader(data)
typ, cr, err := http3.ParseCapsule(r)
require.NoError(t, err)
require.Equal(t, capsuleTypeAddressAssign, typ)
capsule, err := parseAddressAssignCapsule(cr)
require.NoError(t, err)
require.Equal(t,
[]AssignedAddress{
{RequestID: 1337, IPPrefix: netip.MustParsePrefix("1.2.3.0/24")},
{RequestID: 1338, IPPrefix: netip.MustParsePrefix("2001:db8::1/128")},
},
capsule.AssignedAddresses,
)
require.Zero(t, r.Len())
}
func TestWriteAddressAssignCapsule(t *testing.T) {
c := &addressAssignCapsule{
AssignedAddresses: []AssignedAddress{
{RequestID: 1337, IPPrefix: netip.MustParsePrefix("1.2.3.0/24")},
{RequestID: 1338, IPPrefix: netip.MustParsePrefix("2001:db8::1/128")},
},
}
data := c.append(nil)
r := bytes.NewReader(data)
typ, cr, err := http3.ParseCapsule(r)
require.NoError(t, err)
require.Equal(t, capsuleTypeAddressAssign, typ)
parsed, err := parseAddressAssignCapsule(cr)
require.NoError(t, err)
require.Equal(t, c, parsed)
require.Zero(t, r.Len())
}
func TestParseAddressAssignCapsuleInvalid(t *testing.T) {
testParseAddressCapsuleInvalid(t, capsuleTypeAddressAssign, func(r io.Reader) error {
_, err := parseAddressAssignCapsule(quicvarint.NewReader(r))
return err
})
}
func testParseAddressCapsuleInvalid(t *testing.T, typ http3.CapsuleType, f func(r io.Reader) error) {
t.Run("invalid IP version", func(t *testing.T) {
addr1 := quicvarint.Append(nil, 1337) // Request ID
addr1 = append(addr1, 5) // Invalid IP version (not 4 or 6)
addr1 = append(addr1, netip.AddrFrom4([4]byte{1, 2, 3, 4}).AsSlice()...)
addr1 = append(addr1, 32) // IP Prefix Length
data := quicvarint.Append(nil, uint64(typ))
data = quicvarint.Append(data, uint64(len(addr1))) // Length
data = append(data, addr1...)
_, cr, err := http3.ParseCapsule(bytes.NewReader(data))
require.NoError(t, err)
require.ErrorContains(t, f(cr), "invalid IP version: 5")
})
t.Run("invalid prefix length", func(t *testing.T) {
addr1 := quicvarint.Append(nil, 1337) // Request ID
addr1 = append(addr1, 4) // IPv4
addr1 = append(addr1, netip.AddrFrom4([4]byte{1, 2, 3, 4}).AsSlice()...)
addr1 = append(addr1, 33) // too long IP Prefix Length
data := quicvarint.Append(nil, uint64(typ))
data = quicvarint.Append(data, uint64(len(addr1))) // Length
data = append(data, addr1...)
_, cr, err := http3.ParseCapsule(bytes.NewReader(data))
require.NoError(t, err)
require.ErrorContains(t, f(cr), "prefix length 33 exceeds IP address length (32)")
})
t.Run("lower bits not covered by prefix length are not all zero", func(t *testing.T) {
addr1 := quicvarint.Append(nil, 1337) // Request ID
addr1 = append(addr1, 4) // IPv4
addr1 = append(addr1, netip.AddrFrom4([4]byte{1, 2, 3, 4}).AsSlice()...) // non-zero lower bits
addr1 = append(addr1, 28) // IP Prefix Length
data := quicvarint.Append(nil, uint64(typ))
data = quicvarint.Append(data, uint64(len(addr1))) // Length
data = append(data, addr1...)
_, cr, err := http3.ParseCapsule(bytes.NewReader(data))
require.NoError(t, err)
require.ErrorContains(t, f(cr), "lower bits not covered by prefix length are not all zero")
})
t.Run("incomplete capsule", func(t *testing.T) {
addr1 := quicvarint.Append(nil, 1337) // Request ID
addr1 = append(addr1, 4) // IPv4
addr1 = append(addr1, netip.AddrFrom4([4]byte{1, 2, 3, 4}).AsSlice()...)
addr1 = append(addr1, 32) // IP Prefix Length
addr2 := quicvarint.Append(nil, 1338) // Request ID
addr2 = append(addr2, 6) // IPv6
addr2 = append(addr2, netip.MustParseAddr("2001:db8::1").AsSlice()...)
addr2 = append(addr2, 128) // IP Prefix Length
data := quicvarint.Append(nil, uint64(typ))
data = quicvarint.Append(data, uint64(len(addr1)+len(addr2))) // Length
data = append(data, addr1...)
data = append(data, addr2...)
_, cr, err := http3.ParseCapsule(bytes.NewReader(data))
require.NoError(t, err)
require.NoError(t, f(cr))
for i := range data {
_, cr, err := http3.ParseCapsule(bytes.NewReader(data[:i]))
if err != nil {
if i == 0 {
require.ErrorIs(t, err, io.EOF)
} else {
require.ErrorIs(t, err, io.ErrUnexpectedEOF)
}
continue
}
_, err = parseAddressAssignCapsule(cr)
require.ErrorIs(t, err, io.ErrUnexpectedEOF)
}
})
}
func TestParseAddressRequestCapsule(t *testing.T) {
addr1 := quicvarint.Append(nil, 1337) // Request ID
addr1 = append(addr1, 4) // IPv4
addr1 = append(addr1, netip.AddrFrom4([4]byte{1, 2, 3, 0}).AsSlice()...)
addr1 = append(addr1, 24) // IP Prefix Length
addr2 := quicvarint.Append(nil, 1338) // Request ID
addr2 = append(addr2, 6) // IPv6
addr2 = append(addr2, netip.MustParseAddr("2001:db8::1").AsSlice()...)
addr2 = append(addr2, 128) // IP Prefix Length
data := quicvarint.Append(nil, uint64(capsuleTypeAddressRequest))
data = quicvarint.Append(data, uint64(len(addr1)+len(addr2))) // Length
data = append(data, addr1...)
data = append(data, addr2...)
r := bytes.NewReader(data)
typ, cr, err := http3.ParseCapsule(r)
require.NoError(t, err)
require.Equal(t, capsuleTypeAddressRequest, typ)
capsule, err := parseAddressRequestCapsule(cr)
require.NoError(t, err)
require.Equal(t,
[]RequestedAddress{
{RequestID: 1337, IPPrefix: netip.MustParsePrefix("1.2.3.0/24")},
{RequestID: 1338, IPPrefix: netip.MustParsePrefix("2001:db8::1/128")},
},
capsule.RequestedAddresses,
)
require.Zero(t, r.Len())
}
func TestWriteAddressRequestCapsule(t *testing.T) {
c := &addressRequestCapsule{
RequestedAddresses: []RequestedAddress{
{RequestID: 1337, IPPrefix: netip.MustParsePrefix("1.2.3.0/24")},
{RequestID: 1338, IPPrefix: netip.MustParsePrefix("2001:db8::1/128")},
},
}
data := c.append(nil)
r := bytes.NewReader(data)
typ, cr, err := http3.ParseCapsule(r)
require.NoError(t, err)
require.Equal(t, capsuleTypeAddressRequest, typ)
parsed, err := parseAddressRequestCapsule(cr)
require.NoError(t, err)
require.Equal(t, c, parsed)
require.Zero(t, r.Len())
}
func TestParseAddressRequestCapsuleInvalid(t *testing.T) {
testParseAddressCapsuleInvalid(t, capsuleTypeAddressRequest, func(r io.Reader) error {
_, err := parseAddressRequestCapsule(quicvarint.NewReader(r))
return err
})
}
func TestParseRouteAdvertisementCapsule(t *testing.T) {
iprange1 := []byte{4} // IPv4
iprange1 = append(iprange1, netip.AddrFrom4([4]byte{1, 1, 1, 1}).AsSlice()...) // Start IP
iprange1 = append(iprange1, netip.AddrFrom4([4]byte{1, 2, 3, 4}).AsSlice()...) // End IP
iprange1 = append(iprange1, 13) // IP Protocol
iprange2 := []byte{6} // IPv6
iprange2 = append(iprange2, netip.MustParseAddr("2001:db8::1").AsSlice()...) // Start IP
iprange2 = append(iprange2, netip.MustParseAddr("2001:db8::100").AsSlice()...) // End IP
iprange2 = append(iprange2, 37) // IP Protocol
data := quicvarint.Append(nil, uint64(capsuleTypeRouteAdvertisement))
data = quicvarint.Append(data, uint64(len(iprange1)+len(iprange2))) // Length
data = append(data, iprange1...)
data = append(data, iprange2...)
r := bytes.NewReader(data)
typ, cr, err := http3.ParseCapsule(r)
require.NoError(t, err)
require.Equal(t, capsuleTypeRouteAdvertisement, typ)
capsule, err := parseRouteAdvertisementCapsule(cr)
require.NoError(t, err)
require.Equal(t,
[]IPRoute{
{StartIP: netip.MustParseAddr("1.1.1.1"), EndIP: netip.MustParseAddr("1.2.3.4"), IPProtocol: 13},
{StartIP: netip.MustParseAddr("2001:db8::1"), EndIP: netip.MustParseAddr("2001:db8::100"), IPProtocol: 37},
},
capsule.IPAddressRanges,
)
require.Equal(t,
rangeToPrefixes(netip.MustParseAddr("1.1.1.1"), netip.MustParseAddr("1.2.3.4")),
capsule.IPAddressRanges[0].Prefixes(),
)
require.Equal(t,
rangeToPrefixes(netip.MustParseAddr("2001:db8::1"), netip.MustParseAddr("2001:db8::100")),
capsule.IPAddressRanges[1].Prefixes(),
)
require.Zero(t, r.Len())
}
func TestWriteRouteAdvertisementCapsule(t *testing.T) {
c := &routeAdvertisementCapsule{
IPAddressRanges: []IPRoute{
{StartIP: netip.MustParseAddr("1.1.1.1"), EndIP: netip.MustParseAddr("1.2.3.4"), IPProtocol: 13},
{StartIP: netip.MustParseAddr("2001:db8::1"), EndIP: netip.MustParseAddr("2001:db8::100"), IPProtocol: 37},
},
}
data := c.append(nil)
r := bytes.NewReader(data)
typ, cr, err := http3.ParseCapsule(r)
require.NoError(t, err)
require.Equal(t, capsuleTypeRouteAdvertisement, typ)
parsed, err := parseRouteAdvertisementCapsule(cr)
require.NoError(t, err)
require.Equal(t, c, parsed)
require.Zero(t, r.Len())
}
func TestParseRouteAdvertisementCapsuleInvalid(t *testing.T) {
t.Run("invalid IP version", func(t *testing.T) {
iprange1 := []byte{5} // IPv5
iprange1 = append(iprange1, netip.AddrFrom4([4]byte{1, 1, 1, 1}).AsSlice()...) // Start IP
iprange1 = append(iprange1, netip.AddrFrom4([4]byte{1, 1, 1, 2}).AsSlice()...) // End IP
iprange1 = append(iprange1, 13) // IP Protocol
data := quicvarint.Append(nil, uint64(capsuleTypeRouteAdvertisement))
data = quicvarint.Append(data, uint64(len(iprange1))) // Length
data = append(data, iprange1...)
_, cr, err := http3.ParseCapsule(bytes.NewReader(data))
require.NoError(t, err)
_, err = parseRouteAdvertisementCapsule(cr)
require.ErrorContains(t, err, "invalid IP version: 5")
})
t.Run("start IP is greater than end IP", func(t *testing.T) {
iprange1 := []byte{4} // IPv4
iprange1 = append(iprange1, netip.AddrFrom4([4]byte{1, 2, 3, 4}).AsSlice()...) // Start IP
iprange1 = append(iprange1, netip.AddrFrom4([4]byte{1, 1, 1, 1}).AsSlice()...) // End IP
iprange1 = append(iprange1, 13) // IP Protocol
data := quicvarint.Append(nil, uint64(capsuleTypeRouteAdvertisement))
data = quicvarint.Append(data, uint64(len(iprange1))) // Length
data = append(data, iprange1...)
_, cr, err := http3.ParseCapsule(bytes.NewReader(data))
require.NoError(t, err)
_, err = parseRouteAdvertisementCapsule(cr)
require.ErrorContains(t, err, "start IP is greater than end IP")
})
t.Run("incomplete capsule", func(t *testing.T) {
iprange1 := []byte{4} // IPv4
iprange1 = append(iprange1, netip.AddrFrom4([4]byte{1, 1, 1, 1}).AsSlice()...) // Start IP
iprange1 = append(iprange1, netip.AddrFrom4([4]byte{2, 2, 2, 2}).AsSlice()...) // End IP
iprange1 = append(iprange1, 13) // IP Protocol
iprange2 := []byte{6} // IPv6
iprange2 = append(iprange2, netip.MustParseAddr("2001:db8::1").AsSlice()...) // Start IP
iprange2 = append(iprange2, netip.MustParseAddr("2001:db8::100").AsSlice()...) // End IP
iprange2 = append(iprange2, 37) // IP Protocol
data := quicvarint.Append(nil, uint64(capsuleTypeRouteAdvertisement))
data = quicvarint.Append(data, uint64(len(iprange1)+len(iprange2))) // Length
data = append(data, iprange1...)
data = append(data, iprange2...)
r := bytes.NewReader(data)
_, cr, err := http3.ParseCapsule(r)
require.NoError(t, err)
_, err = parseRouteAdvertisementCapsule(cr)
require.NoError(t, err)
require.Zero(t, r.Len())
for i := range data {
_, cr, err := http3.ParseCapsule(bytes.NewReader(data[:i]))
if err != nil {
if i == 0 {
require.ErrorIs(t, err, io.EOF)
} else {
require.ErrorIs(t, err, io.ErrUnexpectedEOF)
}
continue
}
_, err = parseRouteAdvertisementCapsule(cr)
require.ErrorIs(t, err, io.ErrUnexpectedEOF)
}
})
}