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// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build darwin dragonfly freebsd linux netbsd openbsd solaris
package net
import (
"reflect"
"testing"
)
func TestSortByRFC6724(t *testing.T) {
tests := []struct {
in []IPAddr
srcs []IP
want []IPAddr
reverse bool // also test it starting backwards
}{
// Examples from RFC 6724 section 10.2:
// Prefer matching scope.
{
in: []IPAddr{
{IP: ParseIP("2001:db8:1::1")},
{IP: ParseIP("198.51.100.121")},
},
srcs: []IP{
ParseIP("2001:db8:1::2"),
ParseIP("169.254.13.78"),
},
want: []IPAddr{
{IP: ParseIP("2001:db8:1::1")},
{IP: ParseIP("198.51.100.121")},
},
reverse: true,
},
// Prefer matching scope.
{
in: []IPAddr{
{IP: ParseIP("2001:db8:1::1")},
{IP: ParseIP("198.51.100.121")},
},
srcs: []IP{
ParseIP("fe80::1"),
ParseIP("198.51.100.117"),
},
want: []IPAddr{
{IP: ParseIP("198.51.100.121")},
{IP: ParseIP("2001:db8:1::1")},
},
reverse: true,
},
// Prefer higher precedence.
{
in: []IPAddr{
{IP: ParseIP("2001:db8:1::1")},
{IP: ParseIP("10.1.2.3")},
},
srcs: []IP{
ParseIP("2001:db8:1::2"),
ParseIP("10.1.2.4"),
},
want: []IPAddr{
{IP: ParseIP("2001:db8:1::1")},
{IP: ParseIP("10.1.2.3")},
},
reverse: true,
},
// Prefer smaller scope.
{
in: []IPAddr{
{IP: ParseIP("2001:db8:1::1")},
{IP: ParseIP("fe80::1")},
},
srcs: []IP{
ParseIP("2001:db8:1::2"),
ParseIP("fe80::2"),
},
want: []IPAddr{
{IP: ParseIP("fe80::1")},
{IP: ParseIP("2001:db8:1::1")},
},
reverse: true,
},
// Issue 13283. Having a 10/8 source address does not
// mean we should prefer 23/8 destination addresses.
{
in: []IPAddr{
{IP: ParseIP("54.83.193.112")},
{IP: ParseIP("184.72.238.214")},
{IP: ParseIP("23.23.172.185")},
{IP: ParseIP("75.101.148.21")},
{IP: ParseIP("23.23.134.56")},
{IP: ParseIP("23.21.50.150")},
},
srcs: []IP{
ParseIP("10.2.3.4"),
ParseIP("10.2.3.4"),
ParseIP("10.2.3.4"),
ParseIP("10.2.3.4"),
ParseIP("10.2.3.4"),
ParseIP("10.2.3.4"),
},
want: []IPAddr{
{IP: ParseIP("54.83.193.112")},
{IP: ParseIP("184.72.238.214")},
{IP: ParseIP("23.23.172.185")},
{IP: ParseIP("75.101.148.21")},
{IP: ParseIP("23.23.134.56")},
{IP: ParseIP("23.21.50.150")},
},
reverse: false,
},
// Prefer longer common prefixes, but only for IPv4 address
// pairs in the same special-purpose block.
{
in: []IPAddr{
{IP: ParseIP("1.2.3.4")},
{IP: ParseIP("10.55.0.1")},
{IP: ParseIP("10.66.0.1")},
},
srcs: []IP{
ParseIP("1.2.3.5"),
ParseIP("10.66.1.2"),
ParseIP("10.66.1.2"),
},
want: []IPAddr{
{IP: ParseIP("10.66.0.1")},
{IP: ParseIP("10.55.0.1")},
{IP: ParseIP("1.2.3.4")},
},
reverse: true,
},
}
for i, tt := range tests {
inCopy := make([]IPAddr, len(tt.in))
copy(inCopy, tt.in)
srcCopy := make([]IP, len(tt.in))
copy(srcCopy, tt.srcs)
sortByRFC6724withSrcs(inCopy, srcCopy)
if !reflect.DeepEqual(inCopy, tt.want) {
t.Errorf("test %d:\nin = %s\ngot: %s\nwant: %s\n", i, tt.in, inCopy, tt.want)
}
if tt.reverse {
copy(inCopy, tt.in)
copy(srcCopy, tt.srcs)
for j := 0; j < len(inCopy)/2; j++ {
k := len(inCopy) - j - 1
inCopy[j], inCopy[k] = inCopy[k], inCopy[j]
srcCopy[j], srcCopy[k] = srcCopy[k], srcCopy[j]
}
sortByRFC6724withSrcs(inCopy, srcCopy)
if !reflect.DeepEqual(inCopy, tt.want) {
t.Errorf("test %d, starting backwards:\nin = %s\ngot: %s\nwant: %s\n", i, tt.in, inCopy, tt.want)
}
}
}
}
func TestRFC6724PolicyTableClassify(t *testing.T) {
tests := []struct {
ip IP
want policyTableEntry
}{
{
ip: ParseIP("127.0.0.1"),
want: policyTableEntry{
Prefix: &IPNet{IP: ParseIP("::ffff:0:0"), Mask: CIDRMask(96, 128)},
Precedence: 35,
Label: 4,
},
},
{
ip: ParseIP("2601:645:8002:a500:986f:1db8:c836:bd65"),
want: policyTableEntry{
Prefix: &IPNet{IP: ParseIP("::"), Mask: CIDRMask(0, 128)},
Precedence: 40,
Label: 1,
},
},
{
ip: ParseIP("::1"),
want: policyTableEntry{
Prefix: &IPNet{IP: ParseIP("::1"), Mask: CIDRMask(128, 128)},
Precedence: 50,
Label: 0,
},
},
{
ip: ParseIP("2002::ab12"),
want: policyTableEntry{
Prefix: &IPNet{IP: ParseIP("2002::"), Mask: CIDRMask(16, 128)},
Precedence: 30,
Label: 2,
},
},
}
for i, tt := range tests {
got := rfc6724policyTable.Classify(tt.ip)
if !reflect.DeepEqual(got, tt.want) {
t.Errorf("%d. Classify(%s) = %v; want %v", i, tt.ip, got, tt.want)
}
}
}
func TestRFC6724ClassifyScope(t *testing.T) {
tests := []struct {
ip IP
want scope
}{
{ParseIP("127.0.0.1"), scopeLinkLocal}, // rfc6724#section-3.2
{ParseIP("::1"), scopeLinkLocal}, // rfc4007#section-4
{ParseIP("169.254.1.2"), scopeLinkLocal}, // rfc6724#section-3.2
{ParseIP("fec0::1"), scopeSiteLocal},
{ParseIP("8.8.8.8"), scopeGlobal},
{ParseIP("ff02::"), scopeLinkLocal}, // IPv6 multicast
{ParseIP("ff05::"), scopeSiteLocal}, // IPv6 multicast
{ParseIP("ff04::"), scopeAdminLocal}, // IPv6 multicast
{ParseIP("ff0e::"), scopeGlobal}, // IPv6 multicast
{IPv4(0xe0, 0, 0, 0), scopeGlobal}, // IPv4 link-local multicast as 16 bytes
{IPv4(0xe0, 2, 2, 2), scopeGlobal}, // IPv4 global multicast as 16 bytes
{IPv4(0xe0, 0, 0, 0).To4(), scopeGlobal}, // IPv4 link-local multicast as 4 bytes
{IPv4(0xe0, 2, 2, 2).To4(), scopeGlobal}, // IPv4 global multicast as 4 bytes
}
for i, tt := range tests {
got := classifyScope(tt.ip)
if got != tt.want {
t.Errorf("%d. classifyScope(%s) = %x; want %x", i, tt.ip, got, tt.want)
}
}
}
func TestRFC6724CommonPrefixLength(t *testing.T) {
tests := []struct {
a, b IP
want int
}{
{ParseIP("fe80::1"), ParseIP("fe80::2"), 64},
{ParseIP("fe81::1"), ParseIP("fe80::2"), 15},
{ParseIP("127.0.0.1"), ParseIP("fe80::1"), 0}, // diff size
{IPv4(1, 2, 3, 4), IP{1, 2, 3, 4}, 32},
{IP{1, 2, 255, 255}, IP{1, 2, 0, 0}, 16},
{IP{1, 2, 127, 255}, IP{1, 2, 0, 0}, 17},
{IP{1, 2, 63, 255}, IP{1, 2, 0, 0}, 18},
{IP{1, 2, 31, 255}, IP{1, 2, 0, 0}, 19},
{IP{1, 2, 15, 255}, IP{1, 2, 0, 0}, 20},
{IP{1, 2, 7, 255}, IP{1, 2, 0, 0}, 21},
{IP{1, 2, 3, 255}, IP{1, 2, 0, 0}, 22},
{IP{1, 2, 1, 255}, IP{1, 2, 0, 0}, 23},
{IP{1, 2, 0, 255}, IP{1, 2, 0, 0}, 24},
}
for i, tt := range tests {
got := commonPrefixLen(tt.a, tt.b)
if got != tt.want {
t.Errorf("%d. commonPrefixLen(%s, %s) = %d; want %d", i, tt.a, tt.b, got, tt.want)
}
}
}
func mustParseCIDRs(t *testing.T, blocks ...string) []*IPNet {
res := make([]*IPNet, len(blocks))
for i, block := range blocks {
var err error
_, res[i], err = ParseCIDR(block)
if err != nil {
t.Fatalf("ParseCIDR(%s) failed: %v", block, err)
}
}
return res
}
func TestSameIPv4SpecialPurposeBlock(t *testing.T) {
blocks := mustParseCIDRs(t,
"10.0.0.0/8",
"127.0.0.0/8",
"169.254.0.0/16",
"172.16.0.0/12",
"192.168.0.0/16",
)
addrs := []struct {
ip IP
block int // index or -1
}{
{IP{1, 2, 3, 4}, -1},
{IP{2, 3, 4, 5}, -1},
{IP{10, 2, 3, 4}, 0},
{IP{10, 6, 7, 8}, 0},
{IP{127, 0, 0, 1}, 1},
{IP{127, 255, 255, 255}, 1},
{IP{169, 254, 77, 99}, 2},
{IP{169, 254, 44, 22}, 2},
{IP{169, 255, 0, 1}, -1},
{IP{172, 15, 5, 6}, -1},
{IP{172, 16, 32, 41}, 3},
{IP{172, 31, 128, 9}, 3},
{IP{172, 32, 88, 100}, -1},
{IP{192, 168, 1, 1}, 4},
{IP{192, 168, 128, 42}, 4},
{IP{192, 169, 1, 1}, -1},
}
for i, addr := range addrs {
for j, block := range blocks {
got := block.Contains(addr.ip)
want := addr.block == j
if got != want {
t.Errorf("%d/%d. %s.Contains(%s): got %v, want %v", i, j, block, addr.ip, got, want)
}
}
}
for i, addr1 := range addrs {
for j, addr2 := range addrs {
got := sameIPv4SpecialPurposeBlock(addr1.ip, addr2.ip)
want := addr1.block >= 0 && addr1.block == addr2.block
if got != want {
t.Errorf("%d/%d. sameIPv4SpecialPurposeBlock(%s, %s): got %v, want %v", i, j, addr1.ip, addr2.ip, got, want)
}
}
}
}
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