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Create trace_tcpretrans_test.go #4

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140 changes: 140 additions & 0 deletions gadgets/trace_tcpretrans/test/trace_tcpretrans_test.go
Original file line number Diff line number Diff line change
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// Copyright 2024 The Inspektor Gadget authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package tests

import (
"fmt"
"testing"

"github.com/stretchr/testify/require"

gadgettesting "github.com/inspektor-gadget/inspektor-gadget/gadgets/testing"
igtesting "github.com/inspektor-gadget/inspektor-gadget/pkg/testing"
"github.com/inspektor-gadget/inspektor-gadget/pkg/testing/containers"
igrunner "github.com/inspektor-gadget/inspektor-gadget/pkg/testing/ig"
"github.com/inspektor-gadget/inspektor-gadget/pkg/testing/match"
"github.com/inspektor-gadget/inspektor-gadget/pkg/testing/utils"
eventtypes "github.com/inspektor-gadget/inspektor-gadget/pkg/types"
)

type traceTCPretransEvent struct {
eventtypes.CommonData

Timestamp string `json:"timestamp"`
MntNsID uint64 `json:"mntns_id"`
NetNs uint64 `json:"netns_id"`

Pid uint32 `json:"pid"`
Tid uint32 `json:"tid"`
Uid uint32 `json:"uid"`
Gid uint32 `json:"gid"`

Comm string `json:"comm"`
Type string `json:"type"`
Src utils.L4Endpoint `json:"src"`
Dst utils.L4Endpoint `json:"dst"`
}

func TestTraceTCPretrans(t *testing.T) {
gadgettesting.RequireEnvironmentVariables(t)
utils.InitTest(t)

if utils.CurrentTestComponent == utils.KubectlGadgetTestComponent {
t.Skip("Skipping test as K8s doesn't support privileged containers")
} else if utils.CurrentTestComponent == utils.IgLocalTestComponent && utils.Runtime == "containerd" {
t.Skip("Skipping test as containerd test utils can't use the network")
}

containerFactory, err := containers.NewContainerFactory(utils.Runtime)
require.NoError(t, err, "new container factory")
containerName := "test-trace-tcpretrans"
containerImage := "docker.io/wbitt/network-multitool:latest"

var ns string
// run the container with privileged mode to be able to use tc command
containerOpts := []containers.ContainerOption{containers.WithContainerImage(containerImage), containers.WithPrivileged()}

if utils.CurrentTestComponent == utils.KubectlGadgetTestComponent {
ns = utils.GenerateTestNamespaceName(t, "test-trace-tcpretrans")
containerOpts = append(containerOpts, containers.WithContainerNamespace(ns))
}
// for testing purpose drop 30% of packets and wget 1.1.1.1 every 0.1 seconds
cmds := "tc qdisc add dev eth0 root netem drop 30% && while true; do wget --no-check-certificate -q -O /dev/null https://1.1.1.1; sleep 0.1; done"
testContainer := containerFactory.NewContainer(
containerName,
cmds,
containerOpts...,
)
testContainer.Start(t)
t.Cleanup(func() {
testContainer.Stop(t)
})
var runnerOpts []igrunner.Option
var testingOpts []igtesting.Option
commonDataOpts := []utils.CommonDataOption{utils.WithContainerImageName(containerImage), utils.WithContainerID(testContainer.ID())}

switch utils.CurrentTestComponent {
case utils.IgLocalTestComponent:
runnerOpts = append(runnerOpts, igrunner.WithFlags(fmt.Sprintf("-r=%s", utils.Runtime), "--timeout=5"))
case utils.KubectlGadgetTestComponent:
runnerOpts = append(runnerOpts, igrunner.WithFlags(fmt.Sprintf("-n=%s", ns), "--timeout=5"))
testingOpts = append(testingOpts, igtesting.WithCbBeforeCleanup(utils.PrintLogsFn(ns)))
commonDataOpts = append(commonDataOpts, utils.WithK8sNamespace(ns))
}
runnerOpts = append(runnerOpts, igrunner.WithValidateOutput(
func(t *testing.T, output string) {
expectedEntries := &traceTCPretransEvent{
CommonData: utils.BuildCommonData(containerName, commonDataOpts...),
Src: utils.L4Endpoint{
Addr: utils.NormalizedStr,
Version: 4,
Port: utils.NormalizedInt,
Proto: 6,
},
Dst: utils.L4Endpoint{
Addr: "1.1.1.1",
Version: 4,
Port: 443,
Proto: 6,
},
Uid: 0,
Gid: 0,

Comm: "wget",
Type: "RETRANS",

Timestamp: utils.NormalizedStr,
MntNsID: utils.NormalizedInt,
NetNs: utils.NormalizedInt,
Pid: utils.NormalizedInt,
Tid: utils.NormalizedInt,
}
normalize := func(e *traceTCPretransEvent) {
utils.NormalizeCommonData(&e.CommonData)
utils.NormalizeInt(&e.MntNsID)
utils.NormalizeString(&e.Timestamp)
utils.NormalizeInt(&e.Pid)
utils.NormalizeInt(&e.Tid)
utils.NormalizeInt(&e.NetNs)
utils.NormalizeString(&e.Src.Addr)
utils.NormalizeInt(&e.Src.Port)
}
match.MatchEntries(t, match.JSONMultiObjectMode, output, normalize, expectedEntries)
},
))
traceTCPCmd := igrunner.New("trace_tcpretrans", runnerOpts...)

igtesting.RunTestSteps([]igtesting.TestStep{traceTCPCmd}, t, testingOpts...)
}
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