Steven Polley
1ffadf5c86
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The syntax for the hypd server command has changed. Now instead of specifying an interface name as an argument to the server command, you instead specify a configuration file path. Example: ./hypd server hypdconfig.json |
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|---|---|---|
| .. | ||
| bpf_endian.h | ||
| hyp_bpf_bpfeb.go | ||
| hyp_bpf_bpfeb.o | ||
| hyp_bpf_bpfel.go | ||
| hyp_bpf_bpfel.o | ||
| hyp_bpf.c | ||
| packet.go | ||
| README.md | ||
| vmlinux.h | ||
hypd server
hypd is the port knocking daemon which runs on an edge device connecting to an untrusted network. Leveraging eBPF's XDP hook point, it extracts header information directly and sends to userspace the specific information required. This method is faster than alternative methods such as using libpcap.
eBPF
The hyp_bpf.c program can be recompiled using go generate.
# Debian: sudo apt install git clang linux-headers-amd64 libbpf-dev
go generate .
Generating vmlinux.h
vmlinux.h is included in hyp_bpf.c and can be regenerated with bpftool.
# Debian: sudo apt install bpftool
sudo bpftool btf dump file /sys/kernel/btf/vmlinux format c > ../headers/vmlinux.h
Building hypd
hypd has no CGO dependencies and so can run on musl systems as well.
# To ensure it can run on systems don't use CGO
CGO_ENABLED=0 go build .