From be276aef0b04afdd79803fc04c3010452b6ea803 Mon Sep 17 00:00:00 2001
From: Artem Lukyanov <dukzcry@ya.ru>
Date: Mon, 27 Dec 2021 14:21:51 +0300
Subject: [PATCH] Add Windows support

---
 .github/workflows/build.sh |  7 ++--
 README.md                  |  3 ++
 cli/up.go                  |  2 +-
 tun/tun.go                 |  5 ++-
 tun/tun_windows.go         | 72 ++++++++++++++++++++++++++++++++++++++
 5 files changed, 84 insertions(+), 5 deletions(-)
 create mode 100644 tun/tun_windows.go

diff --git a/.github/workflows/build.sh b/.github/workflows/build.sh
index 3ae337f..2354213 100644
--- a/.github/workflows/build.sh
+++ b/.github/workflows/build.sh
@@ -1,12 +1,13 @@
 #!/bin/bash
 
-platforms=("linux/amd64" "linux/arm" "linux/arm64" "darwin/amd64" "darwin/arm64")
+platforms=("linux/amd64" "linux/arm" "linux/arm64" "darwin/amd64" "darwin/arm64" "windows/amd64" "windows/386")
 
 for platform in "${platforms[@]}"
 do
     platform_split=(${platform//\// })
     GOOS=${platform_split[0]}
     GOARCH=${platform_split[1]}
-    env GOOS=$GOOS GOARCH=$GOARCH CGO_ENABLED=0 go build -ldflags "-s -w -X github.com/hyprspace/hyprspace/cli.appVersion=$1" -o hyprspace-$1-${GOOS}-${GOARCH} .
+    [ $GOOS == "windows" ] && EXT=".exe"
+    env GOOS=$GOOS GOARCH=$GOARCH CGO_ENABLED=0 go build -ldflags "-s -w -X github.com/hyprspace/hyprspace/cli.appVersion=$1" -o hyprspace-$1-${GOOS}-${GOARCH}${EXT} .
 
-done
\ No newline at end of file
+done
diff --git a/README.md b/README.md
index 4967dc3..553c3a9 100644
--- a/README.md
+++ b/README.md
@@ -49,6 +49,7 @@ If you're running Hyprspace on a Mac you'll need to install `iproute2mac`. If yo
 ```bash
 brew install iproute2mac
 ```
+If you're running Hyprspace on Windows you'll need to install [tap-windows](http://build.openvpn.net/downloads/releases/).
 
 ### Installation
 
@@ -88,6 +89,8 @@ but yours could be anything you'd like.
 
 (Note: if you're using a Mac you'll have to use the interface name `utun[0-9]`. Check which interfaces are already in use by running `ip a` once you've got `iproute2mac` installed.)
 
+(Note: if you're using Windows you'll have to use the interface name as seen in Control Panel. IP address will be set automatically only if you run Hyprspace as Administrator.)
+
 ###### Local Machine
 ```bash
 sudo hyprspace init hs0
diff --git a/cli/up.go b/cli/up.go
index 4d2d9e1..2fa0a5e 100644
--- a/cli/up.go
+++ b/cli/up.go
@@ -98,7 +98,7 @@ func UpRun(r *cmd.Root, c *cmd.Sub) {
 
 	fmt.Println("[+] Creating TUN Device")
 	// Create new TUN device
-	iface, err = tun.New(cfg.Interface.Name)
+	iface, err = tun.New(cfg.Interface.Name, cfg.Interface.Address)
 	if err != nil {
 		checkErr(errors.New("interface already in use"))
 	}
diff --git a/tun/tun.go b/tun/tun.go
index 912e8ea..d87b4f4 100644
--- a/tun/tun.go
+++ b/tun/tun.go
@@ -1,3 +1,6 @@
+//go:build !windows
+// +build !windows
+
 package tun
 
 import (
@@ -8,7 +11,7 @@ import (
 )
 
 // New creates and returns a new TUN interface for the application.
-func New(name string) (result *water.Interface, err error) {
+func New(name string, address string) (result *water.Interface, err error) {
 	// Setup TUN Config
 	cfg := water.Config{
 		DeviceType: water.TUN,
diff --git a/tun/tun_windows.go b/tun/tun_windows.go
new file mode 100644
index 0000000..99cc55a
--- /dev/null
+++ b/tun/tun_windows.go
@@ -0,0 +1,72 @@
+//go:build windows
+// +build windows
+
+package tun
+
+import (
+	"os/exec"
+	"net"
+	"fmt"
+
+	"github.com/songgao/water"
+)
+
+// New creates and returns a new TUN interface for the application.
+func New(name string, address string) (result *water.Interface, err error) {
+	// TUN on Windows requires address and network to be set on device creation stage
+	// We also set network to 0.0.0.0/0 so we able to reach networks behind the node
+	// https://github.com/songgao/water/blob/master/params_windows.go
+	// https://gitlab.com/openconnect/openconnect/-/blob/master/tun-win32.c
+	ip, _, err := net.ParseCIDR(address)
+	if err != nil {
+		return nil, err
+	}
+	network := net.IPNet{
+		IP:   ip,
+		Mask: net.IPv4Mask(0,0,0,0),
+	}
+	// Setup TUN Config
+	cfg := water.Config{
+		DeviceType: water.TUN,
+		PlatformSpecificParams: water.PlatformSpecificParams{
+			ComponentID:   "tap0901",
+			InterfaceName: name,
+			Network:       network.String(),
+		},
+	}
+	// Create TUN Interface
+	result, err = water.New(cfg)
+	return
+}
+
+// SetMTU sets the Maximum Tansmission Unit Size for a
+// Packet on the interface.
+func SetMTU(name string, mtu int) (err error) {
+	return netsh("interface", "ipv4", "set", "subinterface", name, "mtu=", fmt.Sprintf("%d", mtu))
+}
+
+// SetAddress sets the interface's known address and subnet.
+func SetAddress(name string, address string) (err error) {
+	return netsh("interface", "ip", "set", "address", "name=", name, "static", address)
+}
+
+// Up brings up an interface to allow it to start accepting connections.
+func Up(name string) (err error) {
+	return
+}
+
+// Down brings down an interface stopping active connections.
+func Down(name string) (err error) {
+	return
+}
+
+// Delete removes a TUN device from the host.
+func Delete(name string) (err error) {
+	return
+}
+
+func netsh(args ...string) (err error) {
+	cmd := exec.Command("netsh", args...)
+	err = cmd.Run()
+	return
+}