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75 Zeilen
1.6 KiB
Markdown
75 Zeilen
1.6 KiB
Markdown
# eaas-vde-proxy
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## Overview
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## Pseudocode
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```python
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class vde_proxy:
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def handle_frame(frame):
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try:
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frame.mac = self.new_mac
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except NameError:
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self.new_mac = random_mac()
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self.new_ip = do_dhcp(new_mac)
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finally:
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frame.mac = self.new_mac
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frame.packet = handle_packet(frame.packet)
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def handle_packet(packet):
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protocols = {
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"ip" : handle_ip,
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"arp": handle_arp,
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}
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return protocols[packet.protocol](packet)
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def handle_ip(packet):
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# Todo: Check DHCP lease and get new one if necessary
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packet.ip = self.new_ip
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if is_dhcp(packet):
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packet = handle_dhcp(packet)
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return packet
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def handle_arp(packet):
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pass
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def handle_dhcp(packet):
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pass
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def do_dhcp(mac):
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# Do DHCP
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return ip
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```
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## Problematic protocols
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Important:
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* DHCP
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* ARP
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Nice to have:
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* NetBEUI / NetBIOS
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Keep in mind:
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* IPv6 (NDP, Interface Identifier, ...)
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* IPSec
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* 802.1X
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## Library support
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### Go:
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* Internet layer packet modification: https://github.com/google/gopacket / https://pkg.go.dev/github.com/google/gopacket
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* Link layer frame modification: https://github.com/mdlayher/ethernet / https://pkg.go.dev/github.com/mdlayher/ethernet (not recently updated, alternative?)
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### Rust:
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* https://docs.rs/etherparse/0.9.0/etherparse
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