commit f3fc03392a17fdac3d1027236eea79985f7f951d
Author: Kyle Isom <kyle@imap.cc>
Date:   Sat Apr 22 01:25:13 2023 -0700

    Initial import.

diff --git a/BUILD.bazel b/BUILD.bazel
new file mode 100644
index 0000000..b369316
--- /dev/null
+++ b/BUILD.bazel
@@ -0,0 +1,4 @@
+load("@bazel_gazelle//:def.bzl", "gazelle")
+
+# gazelle:prefix git.wntrmute.dev/kyle/bladerunner
+gazelle(name = "gazelle")
diff --git a/WORKSPACE.bazel b/WORKSPACE.bazel
new file mode 100644
index 0000000..fc54605
--- /dev/null
+++ b/WORKSPACE.bazel
@@ -0,0 +1,36 @@
+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+
+http_archive(
+    name = "io_bazel_rules_go",
+    sha256 = "6b65cb7917b4d1709f9410ffe00ecf3e160edf674b78c54a894471320862184f",
+    urls = [
+        "https://mirror.bazel.build/github.com/bazelbuild/rules_go/releases/download/v0.39.0/rules_go-v0.39.0.zip",
+        "https://github.com/bazelbuild/rules_go/releases/download/v0.39.0/rules_go-v0.39.0.zip",
+    ],
+)
+
+http_archive(
+    name = "bazel_gazelle",
+    sha256 = "ecba0f04f96b4960a5b250c8e8eeec42281035970aa8852dda73098274d14a1d",
+    urls = [
+        "https://mirror.bazel.build/github.com/bazelbuild/bazel-gazelle/releases/download/v0.29.0/bazel-gazelle-v0.29.0.tar.gz",
+        "https://github.com/bazelbuild/bazel-gazelle/releases/download/v0.29.0/bazel-gazelle-v0.29.0.tar.gz",
+    ],
+)
+
+load("@io_bazel_rules_go//go:deps.bzl", "go_register_toolchains", "go_rules_dependencies")
+load("@bazel_gazelle//:deps.bzl", "gazelle_dependencies")
+
+############################################################
+# Define your own dependencies here using go_repository.
+# Else, dependencies declared by rules_go/gazelle will be used.
+# The first declaration of an external repository "wins".
+############################################################
+
+load("//:deps.bzl", "go_dependencies")
+
+# gazelle:repository_macro deps.bzl%go_dependencies
+go_dependencies()
+go_rules_dependencies()
+go_register_toolchains(version = "1.20.3")
+gazelle_dependencies()
diff --git a/cmd/kdhcpd/main.go b/cmd/kdhcpd/main.go
new file mode 100644
index 0000000..35bd285
--- /dev/null
+++ b/cmd/kdhcpd/main.go
@@ -0,0 +1,19 @@
+package main
+
+import (
+	"flag"
+	"log"
+
+	"git.wntrmute.dev/kyle/kdhcp/server"
+)
+
+func main() {
+	cfg := &server.Config{}
+	flag.StringVar(&cfg.Device, "i", "eth0", "network `interface` to listen on")
+	flag.Parse()
+
+	_, err := server.NewServer(cfg)
+	if err != nil {
+		log.Fatal(err)
+	}
+}
diff --git a/gazelle.sh b/gazelle.sh
new file mode 100644
index 0000000..1ee87ce
--- /dev/null
+++ b/gazelle.sh
@@ -0,0 +1,14 @@
+#!/bin/sh
+
+set -euxo pipefail
+
+BAZEL="bazel"
+if [ -z "$(command -v ${BAZEL})" ]
+then
+	BAZEL="bazelisk"
+fi
+
+$BAZEL run //:gazelle
+$BAZEL run //:gazelle -- update-repos -from_file=go.mod -to_macro=deps.bzl%go_dependencies
+$BAZEL run //:gazelle
+
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..65692ca
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module git.wntrmute.dev/kyle/kdhcp
+
+go 1.20
diff --git a/server/server.go b/server/server.go
new file mode 100644
index 0000000..2c7246a
--- /dev/null
+++ b/server/server.go
@@ -0,0 +1,62 @@
+package server
+
+import (
+	"errors"
+	"log"
+	"net"
+)
+
+// github.com/insomniacslk/dhcp
+
+type Config struct {
+	Device string `yaml:"device"`
+}
+
+type Server struct {
+	addrs []net.IP
+	l     net.Listener
+}
+
+func addrsForDevice(dev string) ([]net.IP, error) {
+	netInterface, err := net.InterfaceByName(dev)
+	if err != nil {
+		return nil, err
+	}
+
+	var addrs []net.IP
+	devAddrs, err := netInterface.Addrs()
+	if err != nil {
+		return nil, err
+	}
+
+	for _, addr := range devAddrs {
+		ip := net.ParseIP(addr.String())
+		if ip == nil {
+			continue // address isn't an IP address
+		}
+
+		// DHCP should only listen on private addresses.
+		if !ip.IsPrivate() {
+			continue
+		}
+
+		// only support IPv4 for now
+		if len(ip) != 4 {
+			continue
+		}
+
+		addrs = append(addrs, ip)
+	}
+
+	return addrs, nil
+}
+
+func NewServer(cfg *Config) (*Server, error) {
+	addrs, err := addrsForDevice(cfg.Device)
+	if err != nil {
+		return nil, err
+	}
+
+	log.Println("server IP list: ", addrs)
+	return nil, errors.New("not implemented")
+}