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Tcp rst handling (#40)

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* claude suggests a way forward

* add timing to capture printer

* add pcap.Flags

* fix ICMP CRC calculation and add test

* bugfix: still send data on half-close state(close-wait)

* fix pcap test
This commit is contained in:
Pat Whittingslow
2026-02-23 13:50:13 +01:00
committed by GitHub
parent 08423d0dba
commit 7d323aae19
10 changed files with 386 additions and 46 deletions
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internet/pcap/format.go
+4 -4
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@@ -68,7 +68,7 @@ func (f *Formatter) FormatFrame(dst []byte, frm Frame, pkt []byte) (_ []byte, er
if field.Class == FieldClassFlags && frm.Protocol == lneto.IPProtoTCP {
// TCP flags pretty print special case.
dst = append(dst, "flags="...)
v, err := fieldAsUint(pkt, frm.PacketBitOffset+field.FrameBitOffset, field.BitLength, field.RightAligned)
v, err := fieldAsUint(pkt, frm.PacketBitOffset+field.FrameBitOffset, field.BitLength, field.Flags.IsRightAligned())
if err != nil {
return dst, err
}
@@ -95,7 +95,7 @@ func (f *Formatter) FormatFrame(dst []byte, frm Frame, pkt []byte) (_ []byte, er
func (f *Formatter) filterField(field FrameField) bool {
return f.FilterClasses != nil && !slices.Contains(f.FilterClasses, field.Class) ||
(field.Legacy && !f.DisableLegacyFilter)
(field.Flags.IsLegacy() && !f.DisableLegacyFilter)
}
func (f *Formatter) FormatField(dst []byte, pktStartOff int, field FrameField, pkt []byte) (_ []byte, err error) {
@@ -133,7 +133,7 @@ func (f *Formatter) formatField(dst []byte, pktStartOff int, field FrameField, p
dst = append(dst, '=')
f.mubuf.Lock()
defer f.mubuf.Unlock()
f.buf, err = appendField(f.buf[:0], pkt, field.FrameBitOffset+pktStartOff, field.BitLength, field.RightAligned)
f.buf, err = appendField(f.buf[:0], pkt, field.FrameBitOffset+pktStartOff, field.BitLength, field.Flags.IsRightAligned())
if err != nil {
return dst, err
}
@@ -158,7 +158,7 @@ func (f *Formatter) formatField(dst []byte, pktStartOff int, field FrameField, p
case FieldClassDst, FieldClassSrc, FieldClassSize, FieldClassAddress, FieldClassOperation:
// IP, MAC addresses and ports.
if field.BitLength <= 16 {
v, err := fieldAsUint(pkt, fieldBitStart, field.BitLength, field.RightAligned)
v, err := fieldAsUint(pkt, fieldBitStart, field.BitLength, field.Flags.IsRightAligned())
if err != nil {
return dst, err
}