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// Unless explicitly stated otherwise all files in this repository are licensed | ||
// under the Apache License Version 2.0. | ||
// This product includes software developed at Datadog (https://www.datadoghq.com/). | ||
// Copyright 2016-present Datadog, Inc. | ||
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// Package tags holds tags related files | ||
package tags | ||
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import ( | ||
"context" | ||
"fmt" | ||
"time" | ||
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"github.com/DataDog/datadog-agent/comp/core/tagger/taggerimpl/remote" | ||
taggerTelemetry "github.com/DataDog/datadog-agent/comp/core/tagger/telemetry" | ||
"github.com/DataDog/datadog-agent/comp/core/tagger/types" | ||
"github.com/DataDog/datadog-agent/comp/core/telemetry" | ||
pkgconfigsetup "github.com/DataDog/datadog-agent/pkg/config/setup" | ||
"github.com/DataDog/datadog-agent/pkg/security/probe/config" | ||
"github.com/DataDog/datadog-agent/pkg/security/resolvers/cgroup" | ||
cgroupModel "github.com/DataDog/datadog-agent/pkg/security/resolvers/cgroup/model" | ||
"github.com/DataDog/datadog-agent/pkg/util/log" | ||
) | ||
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// Listener is used to propagate tags events | ||
type Listener func(workload *cgroupModel.CacheEntry) | ||
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// LinuxResolver represents a default resolver based directly on the underlying tagger | ||
type LinuxResolver struct { | ||
*DefaultResolver | ||
workloadsWithoutTags chan *cgroupModel.CacheEntry | ||
cgroupResolver *cgroup.Resolver | ||
} | ||
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// Start the resolver | ||
func (t *LinuxResolver) Start(ctx context.Context) error { | ||
if err := t.DefaultResolver.Start(ctx); err != nil { | ||
return err | ||
} | ||
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if err := t.cgroupResolver.RegisterListener(cgroup.CGroupCreated, t.checkTags); err != nil { | ||
return err | ||
} | ||
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go func() { | ||
ctx, cancel := context.WithCancel(ctx) | ||
defer cancel() | ||
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delayerTick := time.NewTicker(10 * time.Second) | ||
defer delayerTick.Stop() | ||
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for { | ||
select { | ||
case <-ctx.Done(): | ||
return | ||
case <-delayerTick.C: | ||
select { | ||
case workload := <-t.workloadsWithoutTags: | ||
t.checkTags(workload) | ||
default: | ||
} | ||
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} | ||
} | ||
}() | ||
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return nil | ||
} | ||
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// checkTags checks if the tags of a workload were properly set | ||
func (t *LinuxResolver) checkTags(workload *cgroupModel.CacheEntry) { | ||
// check if the workload tags were found | ||
if workload.NeedsTagsResolution() { | ||
// this is a container, try to resolve its tags now | ||
if err := t.fetchTags(workload); err != nil || workload.NeedsTagsResolution() { | ||
// push to the workloadsWithoutTags chan so that its tags can be resolved later | ||
select { | ||
case t.workloadsWithoutTags <- workload: | ||
default: | ||
} | ||
return | ||
} | ||
} | ||
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// notify listeners | ||
t.listenersLock.Lock() | ||
defer t.listenersLock.Unlock() | ||
for _, l := range t.listeners[WorkloadSelectorResolved] { | ||
l(workload) | ||
} | ||
} | ||
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// fetchTags fetches tags for the provided workload | ||
func (t *LinuxResolver) fetchTags(container *cgroupModel.CacheEntry) error { | ||
newTags, err := t.ResolveWithErr(string(container.ContainerID)) | ||
if err != nil { | ||
return fmt.Errorf("failed to resolve %s: %w", container.ContainerID, err) | ||
} | ||
container.SetTags(newTags) | ||
return nil | ||
} | ||
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// NewResolver returns a new tags resolver | ||
func NewResolver(config *config.Config, telemetry telemetry.Component, cgroupsResolver *cgroup.Resolver) Resolver { | ||
defaultResolver := NewDefaultResolver(config, telemetry) | ||
workloadsWithoutTags := make(chan *cgroupModel.CacheEntry, 100) | ||
resolver := &LinuxResolver{ | ||
DefaultResolver: defaultResolver, | ||
workloadsWithoutTags: workloadsWithoutTags, | ||
cgroupResolver: cgroupsResolver, | ||
} | ||
if config.RemoteTaggerEnabled { | ||
options, err := remote.NodeAgentOptionsForSecurityResolvers(pkgconfigsetup.Datadog()) | ||
if err != nil { | ||
log.Errorf("unable to configure the remote tagger: %s", err) | ||
} else { | ||
resolver.tagger = remote.NewTagger(options, pkgconfigsetup.Datadog(), taggerTelemetry.NewStore(telemetry), types.NewMatchAllFilter()) | ||
} | ||
} | ||
return resolver | ||
} |
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@@ -0,0 +1,22 @@ | ||
// Unless explicitly stated otherwise all files in this repository are licensed | ||
// under the Apache License Version 2.0. | ||
// This product includes software developed at Datadog (https://www.datadoghq.com/). | ||
// Copyright 2016-present Datadog, Inc. | ||
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//go:build !linux | ||
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// Package tags holds tags related files | ||
package tags | ||
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import ( | ||
"github.com/DataDog/datadog-agent/comp/core/telemetry" | ||
"github.com/DataDog/datadog-agent/pkg/security/probe/config" | ||
) | ||
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// Listener is used to propagate tags events | ||
type Listener func(workload interface{}) | ||
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// NewResolver returns a new tags resolver | ||
func NewResolver(config *config.Config, telemetry telemetry.Component) Resolver { | ||
return NewDefaultResolver(config, telemetry) | ||
} |