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// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
package ippool
import (
"math"
"math/big"
"net/netip"
"testing"
"go4.org/netipx"
"tailscale.com/util/must"
)
func TestV4ToNum(t *testing.T) {
cases := []struct {
addr netip.Addr
num uint32
}{
{netip.MustParseAddr("0.0.0.0"), 0},
{netip.MustParseAddr("255.255.255.255"), 0xffffffff},
{netip.MustParseAddr("8.8.8.8"), 0x08080808},
{netip.MustParseAddr("192.168.0.1"), 0xc0a80001},
{netip.MustParseAddr("10.0.0.1"), 0x0a000001},
{netip.MustParseAddr("172.16.0.1"), 0xac100001},
{netip.MustParseAddr("100.64.0.1"), 0x64400001},
}
for _, tc := range cases {
num := v4ToNum(tc.addr)
if num != tc.num {
t.Errorf("addrNum(%v) = %d, want %d", tc.addr, num, tc.num)
}
if numToV4(num) != tc.addr {
t.Errorf("numToV4(%d) = %v, want %v", num, numToV4(num), tc.addr)
}
}
func() {
defer func() {
if r := recover(); r == nil {
t.Fatal("expected panic")
}
}()
v4ToNum(netip.MustParseAddr("::1"))
}()
}
func TestAddrIndex(t *testing.T) {
builder := netipx.IPSetBuilder{}
builder.AddRange(netipx.MustParseIPRange("10.0.0.1-10.0.0.5"))
builder.AddRange(netipx.MustParseIPRange("192.168.0.1-192.168.0.10"))
ipset := must.Get(builder.IPSet())
indexCases := []struct {
addr netip.Addr
index int
}{
{netip.MustParseAddr("10.0.0.1"), 0},
{netip.MustParseAddr("10.0.0.2"), 1},
{netip.MustParseAddr("10.0.0.3"), 2},
{netip.MustParseAddr("10.0.0.4"), 3},
{netip.MustParseAddr("10.0.0.5"), 4},
{netip.MustParseAddr("192.168.0.1"), 5},
{netip.MustParseAddr("192.168.0.5"), 9},
{netip.MustParseAddr("192.168.0.10"), 14},
{netip.MustParseAddr("172.16.0.1"), -1}, // Not in set
}
for _, tc := range indexCases {
index := indexOfAddr(tc.addr, ipset)
if index != tc.index {
t.Errorf("indexOfAddr(%v) = %d, want %d", tc.addr, index, tc.index)
}
if tc.index == -1 {
continue
}
addr := addrAtIndex(tc.index, ipset)
if addr != tc.addr {
t.Errorf("addrAtIndex(%d) = %v, want %v", tc.index, addr, tc.addr)
}
}
}
func TestAllocAddr(t *testing.T) {
builder := netipx.IPSetBuilder{}
builder.AddRange(netipx.MustParseIPRange("10.0.0.1-10.0.0.5"))
builder.AddRange(netipx.MustParseIPRange("192.168.0.1-192.168.0.10"))
ipset := must.Get(builder.IPSet())
allocated := new(big.Int)
for range 15 {
addr := allocAddr(ipset, allocated)
if !addr.IsValid() {
t.Errorf("allocAddr() = invalid, want valid")
}
if !ipset.Contains(addr) {
t.Errorf("allocAddr() = %v, not in set", addr)
}
}
addr := allocAddr(ipset, allocated)
if addr.IsValid() {
t.Errorf("allocAddr() = %v, want invalid", addr)
}
wantAddr := netip.MustParseAddr("10.0.0.2")
allocated.SetBit(allocated, indexOfAddr(wantAddr, ipset), 0)
addr = allocAddr(ipset, allocated)
if addr != wantAddr {
t.Errorf("allocAddr() = %v, want %v", addr, wantAddr)
}
}
func TestLeastZeroBit(t *testing.T) {
cases := []struct {
num uint
want int
}{
{math.MaxUint, -1},
{0, 0},
{0b01, 1},
{0b11, 2},
{0b111, 3},
{math.MaxUint, -1},
{math.MaxUint - 1, 0},
}
if math.MaxUint == math.MaxUint64 {
cases = append(cases, []struct {
num uint
want int
}{
{math.MaxUint >> 1, 63},
}...)
} else {
cases = append(cases, []struct {
num uint
want int
}{
{math.MaxUint >> 1, 31},
}...)
}
for _, tc := range cases {
got := leastZeroBit(tc.num)
if got != tc.want {
t.Errorf("leastZeroBit(%b) = %d, want %d", tc.num, got, tc.want)
}
}
}
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