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HTTP server example and DHCP Server rewrite (#38)

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* improvements to dhcpv4 server

* begin adding examples/httpserver

* add better VLAN tagging methods

* pcap: add error printing; fix bug in CRC

* ipv4: ToS and Flags construction and flag manipulation improvements

* add dhcp interception to httptap and improve httpserver example
This commit is contained in:
Pat Whittingslow
2026-02-18 20:48:30 +01:00
committed by GitHub
parent fae4552ddb
commit bf2d07d9f0
12 changed files with 1403 additions and 48 deletions
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ethernet/frame.go
+18
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@@ -79,6 +79,24 @@ func (efrm Frame) SetEtherType(v Type) {
// VLANTag returns the VLAN tag field following the TPID=0x8100. See [VLANTag]. Call [Frame.ValidateSize] to ensure this function does not panic.
func (efrm Frame) VLANTag() VLANTag { return VLANTag(binary.BigEndian.Uint16(efrm.buf[14:16])) }
// SetVLAN sets following 3 fields:
// - 12:14 ethernet frame type set to constant [TypeVLAN].
// - 14:16 set to VLANTag argument value vt
// - 16:18 set to the VLAN ether type vlanType.
func (efrm Frame) SetVLAN(tag VLANTag, vlanType Type) {
efrm.SetEtherType(TypeVLAN)
binary.BigEndian.PutUint16(efrm.buf[14:16], uint16(tag))
binary.BigEndian.PutUint16(efrm.buf[16:18], uint16(vlanType))
}
// VLAN returns fields 14:16 and 16:18. Does not check field 12:14 for correctness.
// VLAN panics if length is insufficient.
func (efrm Frame) VLAN() (VLANTag, Type) {
vt := binary.BigEndian.Uint16(efrm.buf[14:16])
et := binary.BigEndian.Uint16(efrm.buf[16:18])
return VLANTag(vt), Type(et)
}
// SetVLANTag sets the VLAN tag field of the Ethernet Header. See [VLANTag]. Call [Frame.ValidateSize] to ensure this function does not panic.
func (efrm Frame) SetVLANTag(vt VLANTag) { binary.BigEndian.PutUint16(efrm.buf[14:16], uint16(vt)) }