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escape dnstap version directive
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,3 @@ | ||
| # Transformer: Rewrite | ||
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| Use this transformer to rewrite internal DNS messages structure. |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,91 @@ | ||
| package transformers | ||
|
|
||
| import ( | ||
| "errors" | ||
| "reflect" | ||
| "strings" | ||
|
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| "github.com/dmachard/go-dnscollector/dnsutils" | ||
| "github.com/dmachard/go-dnscollector/pkgconfig" | ||
| "github.com/dmachard/go-logger" | ||
| ) | ||
|
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| type RewriteTransform struct { | ||
| GenericTransformer | ||
| } | ||
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| func NewRewriteTransform(config *pkgconfig.ConfigTransformers, logger *logger.Logger, name string, instance int, nextWorkers []chan dnsutils.DNSMessage) *RewriteTransform { | ||
| t := &RewriteTransform{GenericTransformer: NewTransformer(config, logger, "rewrite", name, instance, nextWorkers)} | ||
| return t | ||
| } | ||
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| func (t *RewriteTransform) GetTransforms() ([]Subtransform, error) { | ||
| subtransforms := []Subtransform{} | ||
| if len(t.config.Rewrite.Identifiers) > 0 { | ||
| subtransforms = append(subtransforms, Subtransform{name: "rewrite", processFunc: t.UpdateValues}) | ||
| } | ||
| return subtransforms, nil | ||
| } | ||
|
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| func (t *RewriteTransform) UpdateValues(dm *dnsutils.DNSMessage) (int, error) { | ||
| dmValue := reflect.ValueOf(dm) | ||
| if dmValue.Kind() == reflect.Ptr { | ||
| dmValue = dmValue.Elem() | ||
| } | ||
|
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| for nestedKeys, value := range t.config.Rewrite.Identifiers { | ||
| realValue, found := getFieldByTag(dmValue, nestedKeys) | ||
| switch { | ||
| case !found: | ||
| return 0, errors.New("field not found: " + nestedKeys) | ||
| case !realValue.CanSet(): | ||
| return 0, errors.New("field cannot be set: " + nestedKeys) | ||
| default: | ||
| newValue := reflect.ValueOf(value) | ||
| if realValue.Kind() == newValue.Kind() { | ||
| realValue.Set(newValue) | ||
| } else { | ||
| return 0, errors.New("type mismatch: unable to set the value for " + nestedKeys) | ||
| } | ||
| } | ||
| } | ||
|
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| return ReturnKeep, nil | ||
| } | ||
|
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| func getFieldByTag(value reflect.Value, nestedKeys string) (reflect.Value, bool) { | ||
| listKeys := strings.SplitN(nestedKeys, ".", 2) | ||
|
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| for j, jsonKey := range listKeys { | ||
| // Iterate over the fields of the structure | ||
| for i := 0; i < value.NumField(); i++ { | ||
| field := value.Type().Field(i) | ||
|
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| // Get JSON tag | ||
| tag := field.Tag.Get("json") | ||
| tagClean := strings.TrimSuffix(tag, ",omitempty") | ||
|
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| // Check if the JSON tag matches | ||
| if tagClean == jsonKey { | ||
| switch field.Type.Kind() { | ||
| // ptr | ||
| case reflect.Ptr: | ||
| if fieldValue, found := getFieldByTag(value.Field(i).Elem(), listKeys[j+1]); found { | ||
| return fieldValue, true | ||
| } | ||
|
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| // struct | ||
| case reflect.Struct: | ||
| if fieldValue, found := getFieldByTag(value.Field(i), listKeys[j+1]); found { | ||
| return fieldValue, true | ||
| } | ||
| // int, string | ||
| default: | ||
| return value.Field(i), true | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| return reflect.Value{}, false | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,31 @@ | ||
| package transformers | ||
|
|
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| import ( | ||
| "testing" | ||
|
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| "github.com/dmachard/go-dnscollector/dnsutils" | ||
| "github.com/dmachard/go-dnscollector/pkgconfig" | ||
| "github.com/dmachard/go-logger" | ||
| ) | ||
|
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| func TestRewrite_CompileRegex(t *testing.T) { | ||
| // enable feature | ||
| config := pkgconfig.GetFakeConfigTransformers() | ||
| config.Relabeling.Enable = true | ||
| config.Relabeling.Rename = append(config.Relabeling.Rename, pkgconfig.RelabelingConfig{ | ||
| Regex: "^dns.qname$", | ||
| Replacement: "qname_test", | ||
| }) | ||
| config.Relabeling.Remove = append(config.Relabeling.Remove, pkgconfig.RelabelingConfig{ | ||
| Regex: "^dns.qtype$", | ||
| }) | ||
|
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| // init the processor | ||
| outChans := []chan dnsutils.DNSMessage{} | ||
| relabeling := NewRelabelTransform(config, logger.New(false), "test", 0, outChans) | ||
| relabeling.GetTransforms() | ||
|
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| if len(relabeling.RelabelingRules) != 2 { | ||
| t.Errorf("invalid number of rules") | ||
| } | ||
| } |
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