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80fca061e7
Now IP reuses only after all IPs from network was allocated Fixes #5729 Docker-DCO-1.1-Signed-off-by: Alexandr Morozov <lk4d4math@gmail.com> (github: LK4D4)
326 lines
6.4 KiB
Go
326 lines
6.4 KiB
Go
package ipallocator
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import (
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"fmt"
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"net"
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"testing"
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)
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func reset() {
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allocatedIPs = networkSet{}
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}
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func TestRequestNewIps(t *testing.T) {
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defer reset()
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network := &net.IPNet{
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IP: []byte{192, 168, 0, 1},
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Mask: []byte{255, 255, 255, 0},
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}
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var ip *net.IP
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var err error
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for i := 2; i < 10; i++ {
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ip, err = RequestIP(network, nil)
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if err != nil {
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t.Fatal(err)
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}
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if expected := fmt.Sprintf("192.168.0.%d", i); ip.String() != expected {
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t.Fatalf("Expected ip %s got %s", expected, ip.String())
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}
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}
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value := intToIP(ipToInt(ip) + 1).String()
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if err := ReleaseIP(network, ip); err != nil {
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t.Fatal(err)
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}
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ip, err = RequestIP(network, nil)
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if err != nil {
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t.Fatal(err)
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}
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if ip.String() != value {
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t.Fatalf("Expected to receive the next ip %s got %s", value, ip.String())
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}
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}
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func TestReleaseIp(t *testing.T) {
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defer reset()
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network := &net.IPNet{
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IP: []byte{192, 168, 0, 1},
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Mask: []byte{255, 255, 255, 0},
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}
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ip, err := RequestIP(network, nil)
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if err != nil {
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t.Fatal(err)
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}
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if err := ReleaseIP(network, ip); err != nil {
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t.Fatal(err)
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}
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}
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func TestGetReleasedIp(t *testing.T) {
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defer reset()
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network := &net.IPNet{
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IP: []byte{192, 168, 0, 1},
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Mask: []byte{255, 255, 255, 0},
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}
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ip, err := RequestIP(network, nil)
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if err != nil {
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t.Fatal(err)
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}
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value := ip.String()
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if err := ReleaseIP(network, ip); err != nil {
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t.Fatal(err)
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}
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for i := 0; i < 252; i++ {
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_, err = RequestIP(network, nil)
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if err != nil {
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t.Fatal(err)
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}
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err = ReleaseIP(network, ip)
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if err != nil {
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t.Fatal(err)
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}
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}
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ip, err = RequestIP(network, nil)
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if err != nil {
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t.Fatal(err)
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}
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if ip.String() != value {
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t.Fatalf("Expected to receive same ip %s got %s", value, ip.String())
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}
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}
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func TestRequesetSpecificIp(t *testing.T) {
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defer reset()
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network := &net.IPNet{
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IP: []byte{192, 168, 0, 1},
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Mask: []byte{255, 255, 255, 0},
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}
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ip := net.ParseIP("192.168.1.5")
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if _, err := RequestIP(network, &ip); err != nil {
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t.Fatal(err)
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}
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}
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func TestConversion(t *testing.T) {
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ip := net.ParseIP("127.0.0.1")
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i := ipToInt(&ip)
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if i == 0 {
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t.Fatal("converted to zero")
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}
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conv := intToIP(i)
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if !ip.Equal(*conv) {
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t.Error(conv.String())
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}
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}
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func TestIPAllocator(t *testing.T) {
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expectedIPs := []net.IP{
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0: net.IPv4(127, 0, 0, 2),
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1: net.IPv4(127, 0, 0, 3),
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2: net.IPv4(127, 0, 0, 4),
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3: net.IPv4(127, 0, 0, 5),
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4: net.IPv4(127, 0, 0, 6),
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}
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gwIP, n, _ := net.ParseCIDR("127.0.0.1/29")
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network := &net.IPNet{IP: gwIP, Mask: n.Mask}
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// Pool after initialisation (f = free, u = used)
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// 2(f) - 3(f) - 4(f) - 5(f) - 6(f)
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// ↑
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// Check that we get 5 IPs, from 127.0.0.2–127.0.0.6, in that
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// order.
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for i := 0; i < 5; i++ {
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ip, err := RequestIP(network, nil)
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if err != nil {
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t.Fatal(err)
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}
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assertIPEquals(t, &expectedIPs[i], ip)
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}
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// Before loop begin
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// 2(f) - 3(f) - 4(f) - 5(f) - 6(f)
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// ↑
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// After i = 0
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// 2(u) - 3(f) - 4(f) - 5(f) - 6(f)
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// ↑
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// After i = 1
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// 2(u) - 3(u) - 4(f) - 5(f) - 6(f)
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// ↑
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// After i = 2
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// 2(u) - 3(u) - 4(u) - 5(f) - 6(f)
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// ↑
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// After i = 3
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// 2(u) - 3(u) - 4(u) - 5(u) - 6(f)
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// ↑
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// After i = 4
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// 2(u) - 3(u) - 4(u) - 5(u) - 6(u)
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// ↑
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// Check that there are no more IPs
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ip, err := RequestIP(network, nil)
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if err == nil {
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t.Fatalf("There shouldn't be any IP addresses at this point, got %s\n", ip)
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}
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// Release some IPs in non-sequential order
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if err := ReleaseIP(network, &expectedIPs[3]); err != nil {
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t.Fatal(err)
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}
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// 2(u) - 3(u) - 4(u) - 5(f) - 6(u)
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// ↑
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if err := ReleaseIP(network, &expectedIPs[2]); err != nil {
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t.Fatal(err)
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}
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// 2(u) - 3(u) - 4(f) - 5(f) - 6(u)
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// ↑
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if err := ReleaseIP(network, &expectedIPs[4]); err != nil {
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t.Fatal(err)
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}
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// 2(u) - 3(u) - 4(f) - 5(f) - 6(f)
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// ↑
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// Make sure that IPs are reused in sequential order, starting
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// with the first released IP
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newIPs := make([]*net.IP, 3)
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for i := 0; i < 3; i++ {
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ip, err := RequestIP(network, nil)
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if err != nil {
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t.Fatal(err)
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}
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newIPs[i] = ip
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}
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assertIPEquals(t, &expectedIPs[2], newIPs[0])
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assertIPEquals(t, &expectedIPs[3], newIPs[1])
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assertIPEquals(t, &expectedIPs[4], newIPs[2])
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_, err = RequestIP(network, nil)
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if err == nil {
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t.Fatal("There shouldn't be any IP addresses at this point")
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}
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}
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func TestAllocateFirstIP(t *testing.T) {
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defer reset()
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network := &net.IPNet{
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IP: []byte{192, 168, 0, 0},
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Mask: []byte{255, 255, 255, 0},
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}
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firstIP := network.IP.To4().Mask(network.Mask)
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first := ipToInt(&firstIP) + 1
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ip, err := RequestIP(network, nil)
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if err != nil {
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t.Fatal(err)
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}
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allocated := ipToInt(ip)
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if allocated == first {
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t.Fatalf("allocated ip should not equal first ip: %d == %d", first, allocated)
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}
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}
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func TestAllocateAllIps(t *testing.T) {
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defer reset()
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network := &net.IPNet{
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IP: []byte{192, 168, 0, 1},
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Mask: []byte{255, 255, 255, 0},
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}
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var (
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current, first *net.IP
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err error
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isFirst = true
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)
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for err == nil {
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current, err = RequestIP(network, nil)
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if isFirst {
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first = current
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isFirst = false
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}
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}
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if err != ErrNoAvailableIPs {
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t.Fatal(err)
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}
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if _, err := RequestIP(network, nil); err != ErrNoAvailableIPs {
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t.Fatal(err)
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}
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if err := ReleaseIP(network, first); err != nil {
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t.Fatal(err)
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}
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again, err := RequestIP(network, nil)
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if err != nil {
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t.Fatal(err)
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}
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assertIPEquals(t, first, again)
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}
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func TestAllocateDifferentSubnets(t *testing.T) {
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defer reset()
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network1 := &net.IPNet{
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IP: []byte{192, 168, 0, 1},
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Mask: []byte{255, 255, 255, 0},
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}
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network2 := &net.IPNet{
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IP: []byte{127, 0, 0, 1},
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Mask: []byte{255, 255, 255, 0},
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}
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expectedIPs := []net.IP{
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0: net.IPv4(192, 168, 0, 2),
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1: net.IPv4(192, 168, 0, 3),
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2: net.IPv4(127, 0, 0, 2),
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3: net.IPv4(127, 0, 0, 3),
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}
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ip11, err := RequestIP(network1, nil)
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if err != nil {
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t.Fatal(err)
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}
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ip12, err := RequestIP(network1, nil)
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if err != nil {
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t.Fatal(err)
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}
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ip21, err := RequestIP(network2, nil)
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if err != nil {
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t.Fatal(err)
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}
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ip22, err := RequestIP(network2, nil)
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if err != nil {
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t.Fatal(err)
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}
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assertIPEquals(t, &expectedIPs[0], ip11)
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assertIPEquals(t, &expectedIPs[1], ip12)
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assertIPEquals(t, &expectedIPs[2], ip21)
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assertIPEquals(t, &expectedIPs[3], ip22)
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}
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func assertIPEquals(t *testing.T, ip1, ip2 *net.IP) {
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if !ip1.Equal(*ip2) {
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t.Fatalf("Expected IP %s, got %s", ip1, ip2)
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}
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}
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