3560c922b1
Retrieve /etc/resolv.conf data (if available)
Add checkNameserverOverlaps and call it to
make sure there are no conflicts
Add utils.GetNameserversAsCIDR and tests
Read /etc/resolv.conf and pull out nameservers,
formatting them as a CIDR block ("1.2.3.4/32")
313 lines
7.8 KiB
Go
313 lines
7.8 KiB
Go
package docker
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import (
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"net"
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"testing"
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)
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func TestPortAllocation(t *testing.T) {
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allocator, err := newPortAllocator()
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if err != nil {
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t.Fatal(err)
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}
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if port, err := allocator.Acquire(80); err != nil {
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t.Fatal(err)
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} else if port != 80 {
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t.Fatalf("Acquire(80) should return 80, not %d", port)
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}
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port, err := allocator.Acquire(0)
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if err != nil {
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t.Fatal(err)
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}
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if port <= 0 {
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t.Fatalf("Acquire(0) should return a non-zero port")
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}
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if _, err := allocator.Acquire(port); err == nil {
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t.Fatalf("Acquiring a port already in use should return an error")
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}
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if newPort, err := allocator.Acquire(0); err != nil {
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t.Fatal(err)
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} else if newPort == port {
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t.Fatalf("Acquire(0) allocated the same port twice: %d", port)
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}
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if _, err := allocator.Acquire(80); err == nil {
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t.Fatalf("Acquiring a port already in use should return an error")
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}
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if err := allocator.Release(80); err != nil {
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t.Fatal(err)
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}
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if _, err := allocator.Acquire(80); err != nil {
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t.Fatal(err)
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}
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}
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func TestNetworkRange(t *testing.T) {
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// Simple class C test
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_, network, _ := net.ParseCIDR("192.168.0.1/24")
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first, last := networkRange(network)
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if !first.Equal(net.ParseIP("192.168.0.0")) {
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t.Error(first.String())
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}
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if !last.Equal(net.ParseIP("192.168.0.255")) {
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t.Error(last.String())
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}
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if size := networkSize(network.Mask); size != 256 {
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t.Error(size)
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}
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// Class A test
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_, network, _ = net.ParseCIDR("10.0.0.1/8")
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first, last = networkRange(network)
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if !first.Equal(net.ParseIP("10.0.0.0")) {
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t.Error(first.String())
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}
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if !last.Equal(net.ParseIP("10.255.255.255")) {
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t.Error(last.String())
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}
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if size := networkSize(network.Mask); size != 16777216 {
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t.Error(size)
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}
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// Class A, random IP address
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_, network, _ = net.ParseCIDR("10.1.2.3/8")
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first, last = networkRange(network)
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if !first.Equal(net.ParseIP("10.0.0.0")) {
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t.Error(first.String())
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}
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if !last.Equal(net.ParseIP("10.255.255.255")) {
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t.Error(last.String())
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}
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// 32bit mask
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_, network, _ = net.ParseCIDR("10.1.2.3/32")
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first, last = networkRange(network)
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if !first.Equal(net.ParseIP("10.1.2.3")) {
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t.Error(first.String())
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}
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if !last.Equal(net.ParseIP("10.1.2.3")) {
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t.Error(last.String())
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}
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if size := networkSize(network.Mask); size != 1 {
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t.Error(size)
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}
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// 31bit mask
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_, network, _ = net.ParseCIDR("10.1.2.3/31")
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first, last = networkRange(network)
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if !first.Equal(net.ParseIP("10.1.2.2")) {
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t.Error(first.String())
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}
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if !last.Equal(net.ParseIP("10.1.2.3")) {
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t.Error(last.String())
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}
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if size := networkSize(network.Mask); size != 2 {
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t.Error(size)
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}
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// 26bit mask
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_, network, _ = net.ParseCIDR("10.1.2.3/26")
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first, last = networkRange(network)
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if !first.Equal(net.ParseIP("10.1.2.0")) {
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t.Error(first.String())
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}
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if !last.Equal(net.ParseIP("10.1.2.63")) {
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t.Error(last.String())
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}
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if size := networkSize(network.Mask); size != 64 {
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t.Error(size)
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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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alloc := newIPAllocator(&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 := alloc.Acquire()
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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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_, err := alloc.Acquire()
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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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// Release some IPs in non-sequential order
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alloc.Release(expectedIPs[3])
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// 2(u) - 3(u) - 4(u) - 5(f) - 6(u)
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// ↑
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alloc.Release(expectedIPs[2])
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// 2(u) - 3(u) - 4(f) - 5(f) - 6(u)
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// ↑
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alloc.Release(expectedIPs[4])
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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 := alloc.Acquire()
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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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// Before loop begin
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// 2(u) - 3(u) - 4(f) - 5(f) - 6(f)
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// ↑
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// After i = 0
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// 2(u) - 3(u) - 4(f) - 5(u) - 6(f)
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// ↑
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// After i = 1
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// 2(u) - 3(u) - 4(f) - 5(u) - 6(u)
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// ↑
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// After i = 2
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// 2(u) - 3(u) - 4(u) - 5(u) - 6(u)
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// ↑
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assertIPEquals(t, expectedIPs[3], newIPs[0])
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assertIPEquals(t, expectedIPs[4], newIPs[1])
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assertIPEquals(t, expectedIPs[2], newIPs[2])
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_, err = alloc.Acquire()
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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 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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func AssertOverlap(CIDRx string, CIDRy string, t *testing.T) {
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_, netX, _ := net.ParseCIDR(CIDRx)
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_, netY, _ := net.ParseCIDR(CIDRy)
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if !networkOverlaps(netX, netY) {
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t.Errorf("%v and %v should overlap", netX, netY)
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}
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}
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func AssertNoOverlap(CIDRx string, CIDRy string, t *testing.T) {
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_, netX, _ := net.ParseCIDR(CIDRx)
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_, netY, _ := net.ParseCIDR(CIDRy)
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if networkOverlaps(netX, netY) {
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t.Errorf("%v and %v should not overlap", netX, netY)
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}
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}
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func TestNetworkOverlaps(t *testing.T) {
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//netY starts at same IP and ends within netX
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AssertOverlap("172.16.0.1/24", "172.16.0.1/25", t)
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//netY starts within netX and ends at same IP
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AssertOverlap("172.16.0.1/24", "172.16.0.128/25", t)
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//netY starts and ends within netX
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AssertOverlap("172.16.0.1/24", "172.16.0.64/25", t)
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//netY starts at same IP and ends outside of netX
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AssertOverlap("172.16.0.1/24", "172.16.0.1/23", t)
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//netY starts before and ends at same IP of netX
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AssertOverlap("172.16.1.1/24", "172.16.0.1/23", t)
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//netY starts before and ends outside of netX
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AssertOverlap("172.16.1.1/24", "172.16.0.1/23", t)
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//netY starts and ends before netX
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AssertNoOverlap("172.16.1.1/25", "172.16.0.1/24", t)
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//netX starts and ends before netY
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AssertNoOverlap("172.16.1.1/25", "172.16.2.1/24", t)
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}
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func TestCheckRouteOverlaps(t *testing.T) {
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routesData := []string{"10.0.2.0/32", "10.0.3.0/24", "10.0.42.0/24", "172.16.42.0/24", "192.168.142.0/24"}
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routes := []*net.IPNet{}
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for _, addr := range routesData {
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_, netX, _ := net.ParseCIDR(addr)
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routes = append(routes, netX)
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}
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_, netX, _ := net.ParseCIDR("172.16.0.1/24")
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if err := checkRouteOverlaps(routes, netX); err != nil {
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t.Fatal(err)
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}
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_, netX, _ = net.ParseCIDR("10.0.2.0/24")
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if err := checkRouteOverlaps(routes, netX); err == nil {
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t.Fatalf("10.0.2.0/24 and 10.0.2.0 should overlap but it doesn't")
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}
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}
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func TestCheckNameserverOverlaps(t *testing.T) {
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nameservers := []string{"10.0.2.3/32", "192.168.102.1/32"}
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_, netX, _ := net.ParseCIDR("10.0.2.3/32")
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if err := checkNameserverOverlaps(nameservers, netX); err == nil {
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t.Fatalf("%s should overlap 10.0.2.3/32 but doesn't", netX)
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}
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_, netX, _ = net.ParseCIDR("192.168.102.2/32")
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if err := checkNameserverOverlaps(nameservers, netX); err != nil {
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t.Fatalf("%s should not overlap %v but it does", netX, nameservers)
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}
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}
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