From 0325eb8536c8deecb3375e2464556434d1b6e283 Mon Sep 17 00:00:00 2001
From: Kyle Isom <kyle@imap.cc>
Date: Sat, 29 Apr 2023 23:46:44 -0700
Subject: [PATCH] bazel stuff

---
 BUILD.bazel                  |  2 +-
 WORKSPACE.bazel => WORKSPACE |  3 +++
 cmd/kdhcpd/BUILD.bazel       | 15 +++++++++++++++
 deps.bzl                     |  9 +++++++++
 gazelle.sh                   |  2 +-
 go.mod                       |  5 +++++
 go.sum                       |  4 ++++
 server/BUILD.bazel           |  9 +++++++++
 server/server.go             | 30 +++++++++++++++++++++++++-----
 9 files changed, 72 insertions(+), 7 deletions(-)
 rename WORKSPACE.bazel => WORKSPACE (99%)
 create mode 100644 cmd/kdhcpd/BUILD.bazel
 create mode 100644 deps.bzl
 mode change 100644 => 100755 gazelle.sh
 create mode 100644 go.sum
 create mode 100644 server/BUILD.bazel

diff --git a/BUILD.bazel b/BUILD.bazel
index b369316..cf529bf 100644
--- a/BUILD.bazel
+++ b/BUILD.bazel
@@ -1,4 +1,4 @@
 load("@bazel_gazelle//:def.bzl", "gazelle")
 
-# gazelle:prefix git.wntrmute.dev/kyle/bladerunner
+# gazelle:prefix git.wntrmute.dev/kyle/kdhcp
 gazelle(name = "gazelle")
diff --git a/WORKSPACE.bazel b/WORKSPACE
similarity index 99%
rename from WORKSPACE.bazel
rename to WORKSPACE
index fc54605..1d1a8bf 100644
--- a/WORKSPACE.bazel
+++ b/WORKSPACE
@@ -31,6 +31,9 @@ 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/BUILD.bazel b/cmd/kdhcpd/BUILD.bazel
new file mode 100644
index 0000000..f300b9a
--- /dev/null
+++ b/cmd/kdhcpd/BUILD.bazel
@@ -0,0 +1,15 @@
+load("@io_bazel_rules_go//go:def.bzl", "go_binary", "go_library")
+
+go_library(
+    name = "kdhcpd_lib",
+    srcs = ["main.go"],
+    importpath = "git.wntrmute.dev/kyle/kdhcp/cmd/kdhcpd",
+    visibility = ["//visibility:private"],
+    deps = ["//server"],
+)
+
+go_binary(
+    name = "kdhcpd",
+    embed = [":kdhcpd_lib"],
+    visibility = ["//visibility:public"],
+)
diff --git a/deps.bzl b/deps.bzl
new file mode 100644
index 0000000..7163a95
--- /dev/null
+++ b/deps.bzl
@@ -0,0 +1,9 @@
+load("@bazel_gazelle//:deps.bzl", "go_repository")
+
+def go_dependencies():
+    go_repository(
+        name = "com_github_davecgh_go_spew",
+        importpath = "github.com/davecgh/go-spew",
+        sum = "h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=",
+        version = "v1.1.1",
+    )
diff --git a/gazelle.sh b/gazelle.sh
old mode 100644
new mode 100755
index 1ee87ce..5b14453
--- a/gazelle.sh
+++ b/gazelle.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 set -euxo pipefail
 
diff --git a/go.mod b/go.mod
index 65692ca..9f9d3d1 100644
--- a/go.mod
+++ b/go.mod
@@ -1,3 +1,8 @@
 module git.wntrmute.dev/kyle/kdhcp
 
 go 1.20
+
+require (
+	github.com/davecgh/go-spew v1.1.1
+	github.com/hashicorp/go-syslog v1.0.0
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..1332d1a
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,4 @@
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/hashicorp/go-syslog v1.0.0 h1:KaodqZuhUoZereWVIYmpUgZysurB1kBLX2j0MwMrUAE=
+github.com/hashicorp/go-syslog v1.0.0/go.mod h1:qPfqrKkXGihmCqbJM2mZgkZGvKG1dFdvsLplgctolz4=
diff --git a/server/BUILD.bazel b/server/BUILD.bazel
new file mode 100644
index 0000000..78cc2a4
--- /dev/null
+++ b/server/BUILD.bazel
@@ -0,0 +1,9 @@
+load("@io_bazel_rules_go//go:def.bzl", "go_library")
+
+go_library(
+    name = "server",
+    srcs = ["server.go"],
+    importpath = "git.wntrmute.dev/kyle/kdhcp/server",
+    visibility = ["//visibility:public"],
+    deps = ["@com_github_davecgh_go_spew//spew"],
+)
diff --git a/server/server.go b/server/server.go
index 2c7246a..87bddf8 100644
--- a/server/server.go
+++ b/server/server.go
@@ -1,13 +1,21 @@
 package server
 
+
 import (
 	"errors"
 	"log"
 	"net"
+
+	"github.com/davecgh/go-spew/spew"
 )
 
 // github.com/insomniacslk/dhcp
 
+type addr struct {
+	IP  net.IP
+	ipn *net.IPNet
+}
+
 type Config struct {
 	Device string `yaml:"device"`
 }
@@ -17,35 +25,47 @@ type Server struct {
 	l     net.Listener
 }
 
-func addrsForDevice(dev string) ([]net.IP, error) {
+func addrsForDevice(dev string) ([]addr, error) {
 	netInterface, err := net.InterfaceByName(dev)
 	if err != nil {
 		return nil, err
 	}
 
-	var addrs []net.IP
+	spew.Dump(netInterface)
+
+	var addrs []addr
 	devAddrs, err := netInterface.Addrs()
 	if err != nil {
 		return nil, err
 	}
 
-	for _, addr := range devAddrs {
-		ip := net.ParseIP(addr.String())
+	for _, devAddr := range devAddrs {
+		log.Printf("consider %s", devAddr.String())
+		ip, ipn, err := net.ParseCIDR(devAddr.String())
+		if err != nil {
+			continue
+		}
+
 		if ip == nil {
 			continue // address isn't an IP address
 		}
 
+		log.Printf("found IP: %s", ip)
+		ip = ip.To4()
+
 		// DHCP should only listen on private addresses.
 		if !ip.IsPrivate() {
+			log.Println("skipping non-private")
 			continue
 		}
 
 		// only support IPv4 for now
 		if len(ip) != 4 {
+			log.Printf("%d IP, only supporting v4 right now", len(ip))
 			continue
 		}
 
-		addrs = append(addrs, ip)
+		addrs = append(addrs, addr{ip, ipn})
 	}
 
 	return addrs, nil