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8e0dde03d0
This will allow passing both cli options and format options to sub decoder. Ex: pass keylog option to a tls decoder when decoding a pcap. Ex: pass decode options to a format inside a http body inside a pcap. Add ArgAs method to lookup argument based on type. This also makes the format decode function have same signature as sub decoders in the decode API. This change decode.Format a bit: DecodeFn is now just func(d *D) any DecodeInArg renamed to DefaultInArg
51 lines
1.5 KiB
Go
51 lines
1.5 KiB
Go
package ar
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import (
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"github.com/wader/fq/format"
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"github.com/wader/fq/pkg/decode"
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"github.com/wader/fq/pkg/interp"
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"github.com/wader/fq/pkg/scalar"
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)
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var probeFormat decode.Group
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func init() {
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interp.RegisterFormat(decode.Format{
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Name: format.AR,
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Description: "Unix archive",
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Groups: []string{format.PROBE},
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DecodeFn: decodeAr,
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Dependencies: []decode.Dependency{
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{Names: []string{format.PROBE}, Group: &probeFormat},
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},
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})
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}
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func decodeAr(d *decode.D) any {
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d.FieldUTF8("signature", 8, d.StrAssert("!<arch>\n"))
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d.FieldArray("files", func(d *decode.D) {
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for !d.End() {
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d.FieldStruct("file", func(d *decode.D) {
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d.FieldUTF8("identifier", 16, scalar.ActualTrimSpace)
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d.FieldUTF8("modification_timestamp", 12, scalar.ActualTrimSpace, scalar.TryStrSymParseUint(10))
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d.FieldUTF8("owner_id", 6, scalar.ActualTrimSpace, scalar.TryStrSymParseUint(10))
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d.FieldUTF8("group_id", 6, scalar.ActualTrimSpace, scalar.TryStrSymParseUint(10))
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d.FieldUTF8("file_mode", 8, scalar.ActualTrimSpace, scalar.TryStrSymParseUint(8)) // Octal
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sizeStr := d.FieldScalarUTF8("file_size", 10, scalar.ActualTrimSpace, scalar.TryStrSymParseUint(10))
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if sizeStr.Sym == nil {
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d.Fatalf("could not decode file_size")
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}
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size := int64(sizeStr.SymUint()) * 8
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d.FieldUTF8("ending_characters", 2)
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d.FieldFormatOrRawLen("data", size, probeFormat, nil)
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padding := d.AlignBits(16)
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if padding > 0 {
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d.FieldRawLen("padding", int64(padding))
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}
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})
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}
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})
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return nil
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}
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