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utils_linux_test.go
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/
utils_linux_test.go
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package netutils
import (
"bytes"
"fmt"
"net"
"strings"
"testing"
"github.com/docker/docker/internal/testutils/netnsutils"
"github.com/docker/docker/libnetwork/ipamutils"
"github.com/docker/docker/libnetwork/types"
"github.com/vishvananda/netlink"
"gotest.tools/v3/assert"
is "gotest.tools/v3/assert/cmp"
)
func TestNonOverlappingNameservers(t *testing.T) {
network := &net.IPNet{
IP: []byte{192, 168, 0, 1},
Mask: []byte{255, 255, 255, 0},
}
nameservers := []string{
"127.0.0.1/32",
}
if err := CheckNameserverOverlaps(nameservers, network); err != nil {
t.Fatal(err)
}
}
func TestOverlappingNameservers(t *testing.T) {
network := &net.IPNet{
IP: []byte{192, 168, 0, 1},
Mask: []byte{255, 255, 255, 0},
}
nameservers := []string{
"192.168.0.1/32",
}
if err := CheckNameserverOverlaps(nameservers, network); err == nil {
t.Fatalf("Expected error %s got %s", ErrNetworkOverlapsWithNameservers, err)
}
}
func TestCheckRouteOverlaps(t *testing.T) {
networkGetRoutesFct = func(netlink.Link, int) ([]netlink.Route, error) {
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"}
routes := []netlink.Route{}
for _, addr := range routesData {
_, netX, _ := net.ParseCIDR(addr)
routes = append(routes, netlink.Route{Dst: netX, Scope: netlink.SCOPE_LINK})
}
// Add a route with a scope which should not overlap
_, netX, _ := net.ParseCIDR("10.0.5.0/24")
routes = append(routes, netlink.Route{Dst: netX, Scope: netlink.SCOPE_UNIVERSE})
return routes, nil
}
defer func() { networkGetRoutesFct = nil }()
_, netX, _ := net.ParseCIDR("172.16.0.1/24")
if err := CheckRouteOverlaps(netX); err != nil {
t.Fatal(err)
}
_, netX, _ = net.ParseCIDR("10.0.2.0/24")
if err := CheckRouteOverlaps(netX); err == nil {
t.Fatal("10.0.2.0/24 and 10.0.2.0 should overlap but it doesn't")
}
_, netX, _ = net.ParseCIDR("10.0.5.0/24")
if err := CheckRouteOverlaps(netX); err != nil {
t.Fatal("10.0.5.0/24 and 10.0.5.0 with scope UNIVERSE should not overlap but it does")
}
}
func TestCheckNameserverOverlaps(t *testing.T) {
nameservers := []string{"10.0.2.3/32", "192.168.102.1/32"}
_, netX, _ := net.ParseCIDR("10.0.2.3/32")
if err := CheckNameserverOverlaps(nameservers, netX); err == nil {
t.Fatalf("%s should overlap 10.0.2.3/32 but doesn't", netX)
}
_, netX, _ = net.ParseCIDR("192.168.102.2/32")
if err := CheckNameserverOverlaps(nameservers, netX); err != nil {
t.Fatalf("%s should not overlap %v but it does", netX, nameservers)
}
}
func AssertOverlap(CIDRx string, CIDRy string, t *testing.T) {
_, netX, _ := net.ParseCIDR(CIDRx)
_, netY, _ := net.ParseCIDR(CIDRy)
if !NetworkOverlaps(netX, netY) {
t.Errorf("%v and %v should overlap", netX, netY)
}
}
func AssertNoOverlap(CIDRx string, CIDRy string, t *testing.T) {
_, netX, _ := net.ParseCIDR(CIDRx)
_, netY, _ := net.ParseCIDR(CIDRy)
if NetworkOverlaps(netX, netY) {
t.Errorf("%v and %v should not overlap", netX, netY)
}
}
func TestNetworkOverlaps(t *testing.T) {
// netY starts at same IP and ends within netX
AssertOverlap("172.16.0.1/24", "172.16.0.1/25", t)
// netY starts within netX and ends at same IP
AssertOverlap("172.16.0.1/24", "172.16.0.128/25", t)
// netY starts and ends within netX
AssertOverlap("172.16.0.1/24", "172.16.0.64/25", t)
// netY starts at same IP and ends outside of netX
AssertOverlap("172.16.0.1/24", "172.16.0.1/23", t)
// netY starts before and ends at same IP of netX
AssertOverlap("172.16.1.1/24", "172.16.0.1/23", t)
// netY starts before and ends outside of netX
AssertOverlap("172.16.1.1/24", "172.16.0.1/22", t)
// netY starts and ends before netX
AssertNoOverlap("172.16.1.1/25", "172.16.0.1/24", t)
// netX starts and ends before netY
AssertNoOverlap("172.16.1.1/25", "172.16.2.1/24", t)
}
// Test veth name generation "veth"+rand (e.g.veth0f60e2c)
func TestGenerateRandomName(t *testing.T) {
const vethPrefix = "veth"
const vethLen = len(vethPrefix) + 7
testCases := []struct {
prefix string
length int
error bool
}{
{vethPrefix, -1, true},
{vethPrefix, 0, true},
{vethPrefix, len(vethPrefix) - 1, true},
{vethPrefix, len(vethPrefix), true},
{vethPrefix, len(vethPrefix) + 1, false},
{vethPrefix, 255, false},
}
for _, tc := range testCases {
t.Run(fmt.Sprintf("prefix=%s/length=%d", tc.prefix, tc.length), func(t *testing.T) {
name, err := GenerateRandomName(tc.prefix, tc.length)
if tc.error {
assert.Check(t, is.ErrorContains(err, "invalid length"))
} else {
assert.NilError(t, err)
assert.Check(t, strings.HasPrefix(name, tc.prefix), "Expected name to start with %s", tc.prefix)
assert.Check(t, is.Equal(len(name), tc.length), "Expected %d characters, instead received %d characters", tc.length, len(name))
}
})
}
var randomNames [16]string
for i := range randomNames {
randomName, err := GenerateRandomName(vethPrefix, vethLen)
assert.NilError(t, err)
for _, oldName := range randomNames {
if randomName == oldName {
t.Fatalf("Duplicate random name generated: %s", randomName)
}
}
randomNames[i] = randomName
}
}
// Test mac generation.
func TestUtilGenerateRandomMAC(t *testing.T) {
mac1 := GenerateRandomMAC()
mac2 := GenerateRandomMAC()
// ensure bytes are unique
if bytes.Equal(mac1, mac2) {
t.Fatalf("mac1 %s should not equal mac2 %s", mac1, mac2)
}
// existing tests check string functionality so keeping the pattern
if mac1.String() == mac2.String() {
t.Fatalf("mac1 %s should not equal mac2 %s", mac1, mac2)
}
}
func TestNetworkRequest(t *testing.T) {
defer netnsutils.SetupTestOSContext(t)()
nw, err := FindAvailableNetwork(ipamutils.GetLocalScopeDefaultNetworks())
if err != nil {
t.Fatal(err)
}
var found bool
for _, exp := range ipamutils.GetLocalScopeDefaultNetworks() {
if types.CompareIPNet(exp, nw) {
found = true
break
}
}
if !found {
t.Fatalf("Found unexpected broad network %s", nw)
}
nw, err = FindAvailableNetwork(ipamutils.GetGlobalScopeDefaultNetworks())
if err != nil {
t.Fatal(err)
}
found = false
for _, exp := range ipamutils.GetGlobalScopeDefaultNetworks() {
if types.CompareIPNet(exp, nw) {
found = true
break
}
}
if !found {
t.Fatalf("Found unexpected granular network %s", nw)
}
// Add iface and ssert returned address on request
createInterface(t, "test", "172.17.42.1/16")
_, exp, err := net.ParseCIDR("172.18.0.0/16")
if err != nil {
t.Fatal(err)
}
nw, err = FindAvailableNetwork(ipamutils.GetLocalScopeDefaultNetworks())
if err != nil {
t.Fatal(err)
}
if !types.CompareIPNet(exp, nw) {
t.Fatalf("expected %s. got %s", exp, nw)
}
}
func createInterface(t *testing.T, name string, nws ...string) {
// Add interface
link := &netlink.Bridge{
LinkAttrs: netlink.LinkAttrs{
Name: "test",
},
}
bips := []*net.IPNet{}
for _, nw := range nws {
bip, err := types.ParseCIDR(nw)
if err != nil {
t.Fatal(err)
}
bips = append(bips, bip)
}
if err := netlink.LinkAdd(link); err != nil {
t.Fatalf("Failed to create interface via netlink: %v", err)
}
for _, bip := range bips {
if err := netlink.AddrAdd(link, &netlink.Addr{IPNet: bip}); err != nil {
t.Fatal(err)
}
}
if err := netlink.LinkSetUp(link); err != nil {
t.Fatal(err)
}
}