feat: initial commit

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LICENSE

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+                    GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU Affero General Public License is a free, copyleft license for
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+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published
+    by the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If your software can interact with users remotely through a computer
+network, you should also make sure that it provides a way for users to
+get its source.  For example, if your program is a web application, its
+interface could display a "Source" link that leads users to an archive
+of the code.  There are many ways you could offer source, and different
+solutions will be better for different programs; see section 13 for the
+specific requirements.
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU AGPL, see
+<https://www.gnu.org/licenses/>.

README.md

@@ -0,0 +1,24 @@
+# vmnet-proxy
+
+A TCP/UDP proxy for macOS utilizing `vmnet.framework`
+
+## Requirements
+
+- macOS 10.10 or later.
+
+## Example usage
+
+```
+$ go build .
+$ sudo ./vmnet-proxy tcp:2222:192.168.1.5:22
+$ sudo ./vmnet-proxy -iface en1 tcp:5901:192.168.1.5:5900
+$ sudo ./vmnet-proxy tcp:443:1.1.1.1:443 tcp:80:1.1.1.1:80
+```
+
+## TODO
+- IPv6 support
+- DHCP support for IPv4
+
+## Credits
+
+Credits to https://github.com/alessiodionisi/qemu-vmnet for the native code in `pkg/vmnet/`.

dialer.go

@@ -0,0 +1,41 @@
+package main
+
+import (
+	"fmt"
+	"net"
+	"net/netip"
+
+	"gvisor.dev/gvisor/pkg/tcpip"
+	"gvisor.dev/gvisor/pkg/tcpip/adapters/gonet"
+	"gvisor.dev/gvisor/pkg/tcpip/header"
+)
+
+func (s *Server) Dial(network, address string) (net.Conn, error) {
+	addrPort, err := netip.ParseAddrPort(address)
+	if err != nil {
+		return nil, err
+	}
+
+	remote := tcpip.FullAddress{
+		Addr: tcpip.AddrFromSlice(addrPort.Addr().AsSlice()),
+		Port: addrPort.Port(),
+	}
+
+	var networkProtocol tcpip.NetworkProtocolNumber
+
+	if addrPort.Addr().Is4() {
+		networkProtocol = header.IPv4ProtocolNumber
+	} else {
+		networkProtocol = header.IPv6ProtocolNumber
+	}
+
+	if network == "tcp" {
+		return gonet.DialTCP(s.stack, remote, networkProtocol)
+	}
+
+	if network == "udp" {
+		return gonet.DialUDP(s.stack, nil, &remote, networkProtocol)
+	}
+
+	return nil, fmt.Errorf("unsupported network: %s", network)
+}

go.mod

@@ -0,0 +1,18 @@
+module vmnet-proxy
+
+go 1.23.1
+
+toolchain go1.23.2
+
+require (
+	github.com/rs/zerolog v1.29.1
+	gvisor.dev/gvisor v0.0.0-20241108012608-5901531b85ba
+)
+
+require (
+	github.com/google/btree v1.1.2 // indirect
+	github.com/mattn/go-colorable v0.1.13 // indirect
+	github.com/mattn/go-isatty v0.0.17 // indirect
+	golang.org/x/sys v0.26.0 // indirect
+	golang.org/x/time v0.7.0 // indirect
+)

go.sum

@@ -0,0 +1,30 @@
+github.com/coreos/go-systemd/v22 v22.5.0/go.mod h1:Y58oyj3AT4RCenI/lSvhwexgC+NSVTIJ3seZv2GcEnc=
+github.com/godbus/dbus/v5 v5.0.4/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA=
+github.com/google/btree v1.1.2 h1:xf4v41cLI2Z6FxbKm+8Bu+m8ifhj15JuZ9sa0jZCMUU=
+github.com/google/btree v1.1.2/go.mod h1:qOPhT0dTNdNzV6Z/lhRX0YXUafgPLFUh+gZMl761Gm4=
+github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
+github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
+github.com/mattn/go-colorable v0.1.12/go.mod h1:u5H1YNBxpqRaxsYJYSkiCWKzEfiAb1Gb520KVy5xxl4=
+github.com/mattn/go-colorable v0.1.13 h1:fFA4WZxdEF4tXPZVKMLwD8oUnCTTo08duU7wxecdEvA=
+github.com/mattn/go-colorable v0.1.13/go.mod h1:7S9/ev0klgBDR4GtXTXX8a3vIGJpMovkB8vQcUbaXHg=
+github.com/mattn/go-isatty v0.0.14/go.mod h1:7GGIvUiUoEMVVmxf/4nioHXj79iQHKdU27kJ6hsGG94=
+github.com/mattn/go-isatty v0.0.16/go.mod h1:kYGgaQfpe5nmfYZH+SKPsOc2e4SrIfOl2e/yFXSvRLM=
+github.com/mattn/go-isatty v0.0.17 h1:BTarxUcIeDqL27Mc+vyvdWYSL28zpIhv3RoTdsLMPng=
+github.com/mattn/go-isatty v0.0.17/go.mod h1:kYGgaQfpe5nmfYZH+SKPsOc2e4SrIfOl2e/yFXSvRLM=
+github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/rs/xid v1.4.0/go.mod h1:trrq9SKmegXys3aeAKXMUTdJsYXVwGY3RLcfgqegfbg=
+github.com/rs/zerolog v1.29.1 h1:cO+d60CHkknCbvzEWxP0S9K6KqyTjrCNUy1LdQLCGPc=
+github.com/rs/zerolog v1.29.1/go.mod h1:Le6ESbR7hc+DP6Lt1THiV8CQSdkkNrd3R0XbEgp3ZBU=
+golang.org/x/mod v0.21.0 h1:vvrHzRwRfVKSiLrG+d4FMl/Qi4ukBCE6kZlTUkDYRT0=
+golang.org/x/mod v0.21.0/go.mod h1:6SkKJ3Xj0I0BrPOZoBy3bdMptDDU9oJrpohJ3eWZ1fY=
+golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20210927094055-39ccf1dd6fa6/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.26.0 h1:KHjCJyddX0LoSTb3J+vWpupP9p0oznkqVk/IfjymZbo=
+golang.org/x/sys v0.26.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/time v0.7.0 h1:ntUhktv3OPE6TgYxXWv9vKvUSJyIFJlyohwbkEwPrKQ=
+golang.org/x/time v0.7.0/go.mod h1:3BpzKBy/shNhVucY/MWOyx10tF3SFh9QdLuxbVysPQM=
+gvisor.dev/gvisor v0.0.0-20241108012608-5901531b85ba h1:ZXzGZ6Md+Vspe9x45C6QlpCdpwYC6nHFtWIfZzTqB0k=
+gvisor.dev/gvisor v0.0.0-20241108012608-5901531b85ba/go.mod h1:5DMfjtclAbTIjbXqO1qCe2K5GKKxWz2JHvCChuTcJEM=
+gvisor.dev/gvisor v0.0.0-20241108230622-f37f2c37c8de h1:3j8b4UaGajW7XdBH6qmSHIfEPOgJGZgRmTcs05nAK10=
+gvisor.dev/gvisor v0.0.0-20241108230622-f37f2c37c8de/go.mod h1:5DMfjtclAbTIjbXqO1qCe2K5GKKxWz2JHvCChuTcJEM=

main.go

@@ -0,0 +1,77 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"os"
+	"os/signal"
+	"strconv"
+	"strings"
+	"syscall"
+
+	"github.com/rs/zerolog"
+	"github.com/rs/zerolog/log"
+)
+
+func main() {
+	log.Logger = log.Output(zerolog.ConsoleWriter{Out: os.Stderr})
+
+	iface := flag.String("iface", "en0", "host interface to use")
+	debug := flag.Bool("debug", false, "sets log level to debug")
+	trace := flag.Bool("trace", false, "sets log level to trace")
+	help := flag.Bool("help", false, "shows help")
+
+	// chosen by fair dice roll
+	hostLinkAddr := flag.String("mac", "00:1A:70:54:A6:93", "MAC address to use")
+	hostProtoAddr := flag.String("ip", "192.168.255.10/24", "IP address to use (with prefix)")
+	gateProtoAddr := flag.String("gateway", "192.168.255.1", "gateway IP address")
+
+	flag.Parse()
+
+	if *help {
+		usage(0)
+	}
+
+	zerolog.SetGlobalLevel(zerolog.InfoLevel)
+	if *debug {
+		zerolog.SetGlobalLevel(zerolog.DebugLevel)
+	}
+	if *trace {
+		zerolog.SetGlobalLevel(zerolog.TraceLevel)
+	}
+
+	server, err := NewServer(*iface, *hostLinkAddr, *hostProtoAddr, *gateProtoAddr)
+	if err != nil {
+		log.Fatal().Msgf("unable to start the server: %s", err)
+	}
+	defer server.Close()
+
+	go server.Loop()
+
+	for _, arg := range flag.Args() {
+		parts := strings.Split(arg, ":")
+		if len(parts) != 4 {
+			usage(1)
+		}
+		network := parts[0]
+		localPort, err := strconv.Atoi(parts[1])
+		if err != nil {
+			panic(err)
+		}
+		remoteAddr := parts[2] + ":" + parts[3]
+		go server.Proxy(network, localPort, remoteAddr)
+	}
+
+	sig := make(chan os.Signal, 1)
+	signal.Notify(sig, syscall.SIGINT, syscall.SIGTERM)
+	<-sig
+
+	log.Info().Msg("closing down")
+
+	server.Shutdown()
+}
+
+func usage(exitcode int) {
+	fmt.Println("usage: ./uwu protocol:local-port:remote-host:remote-port")
+	os.Exit(exitcode)
+}

pkg/vmnet/error.go

@@ -0,0 +1,7 @@
+package vmnet
+
+import "errors"
+
+var (
+	ErrUnableToStart = errors.New("vmnet: unable to start")
+)

pkg/vmnet/vmnet.go

@@ -0,0 +1,59 @@
+package vmnet
+
+// #cgo CFLAGS: -x objective-c
+// #cgo LDFLAGS: -lobjc -framework vmnet
+// #include "vmnet.h"
+import "C"
+import (
+	"io"
+	"unsafe"
+)
+
+type VMNet struct {
+	io.ReadWriter
+
+	iface         C.interface_ref
+	mps           C.ulonglong
+	MaxPacketSize int
+}
+
+func (v *VMNet) Start(hostIface string) error {
+	C._vmnet_start(&v.iface, C.CString(hostIface), &v.mps)
+	if v.iface == nil {
+		return ErrUnableToStart
+	}
+
+	v.MaxPacketSize = int(v.mps)
+
+	return nil
+}
+
+func (v *VMNet) Stop() error {
+	C._vmnet_stop(v.iface)
+	return nil
+}
+
+func (v *VMNet) Read(p []byte) (n int, err error) {
+	for {
+		var cBytes unsafe.Pointer
+		var cBytesLen C.ulong
+
+		C._vmnet_read(v.iface, v.mps, &cBytes, &cBytesLen)
+
+		if cBytes == nil {
+			continue
+		}
+
+		copy(p, C.GoBytes(cBytes, C.int(cBytesLen)))
+		return int(cBytesLen), nil
+	}
+}
+
+func (v *VMNet) Write(p []byte) (n int, err error) {
+	C._vmnet_write(v.iface, C.CBytes(p), C.ulong(len(p)))
+	return len(p), nil
+}
+
+func New() *VMNet {
+	return &VMNet{}
+}

pkg/vmnet/vmnet.h

@@ -0,0 +1,13 @@
+#ifndef vmnet_h
+#define vmnet_h
+
+#include <sys/uio.h>
+#include <vmnet/vmnet.h>
+
+void _vmnet_start(interface_ref *interface, char *host_interface, uint64_t *max_packet_size);
+void _vmnet_stop(interface_ref interface);
+void _vmnet_write(interface_ref interface, void *bytes, size_t bytes_size);
+void _vmnet_read(interface_ref interface, uint64_t max_packet_size,
+                 void **bytes, size_t *bytes_size);
+
+#endif /* vmnet_h */

pkg/vmnet/vmnet.m

@@ -0,0 +1,106 @@
+#import "vmnet.h"
+
+void _vmnet_start(interface_ref *interface, char *host_interface, uint64_t *max_packet_size) {
+  xpc_object_t interface_desc = xpc_dictionary_create(NULL, NULL, 0);
+  xpc_dictionary_set_uint64(interface_desc, vmnet_operation_mode_key,
+                            VMNET_BRIDGED_MODE);
+
+  xpc_dictionary_set_string(interface_desc, vmnet_shared_interface_name_key, host_interface);
+
+  dispatch_queue_t interface_start_queue =
+      dispatch_queue_create("vmnet-start", DISPATCH_QUEUE_SERIAL);
+  dispatch_semaphore_t interface_start_semaphore = dispatch_semaphore_create(0);
+
+  __block interface_ref _interface;
+  __block vmnet_return_t interface_status;
+  __block uint64_t _max_packet_size = 0;
+
+  _interface = vmnet_start_interface(
+      interface_desc, interface_start_queue,
+      ^(vmnet_return_t status, xpc_object_t interface_param) {
+        interface_status = status;
+
+        if (status == VMNET_SUCCESS) {
+          _max_packet_size = xpc_dictionary_get_uint64(
+              interface_param, vmnet_max_packet_size_key);
+        }
+
+        dispatch_semaphore_signal(interface_start_semaphore);
+      });
+
+  dispatch_semaphore_wait(interface_start_semaphore, DISPATCH_TIME_FOREVER);
+
+  dispatch_release(interface_start_queue);
+  xpc_release(interface_desc);
+
+  if (interface_status != VMNET_SUCCESS) {
+    return;
+  }
+
+  *interface = _interface;
+  *max_packet_size = _max_packet_size;
+}
+
+void _vmnet_stop(interface_ref interface) {
+  if (interface == NULL) {
+    return;
+  }
+
+  dispatch_queue_t interface_stop_queue =
+      dispatch_queue_create("vmnet-stop", DISPATCH_QUEUE_SERIAL);
+  dispatch_semaphore_t interface_stop_semaphore = dispatch_semaphore_create(0);
+
+  vmnet_stop_interface(interface, interface_stop_queue,
+                       ^(vmnet_return_t status) {
+                         dispatch_semaphore_signal(interface_stop_semaphore);
+                       });
+
+  dispatch_semaphore_wait(interface_stop_semaphore, DISPATCH_TIME_FOREVER);
+  dispatch_release(interface_stop_queue);
+}
+
+void _vmnet_write(interface_ref interface, void *bytes, size_t bytes_size) {
+  if (interface == NULL) {
+    return;
+  }
+
+  struct iovec packets_iovec = {
+      .iov_base = bytes,
+      .iov_len = bytes_size,
+  };
+
+  struct vmpktdesc packets = {
+      .vm_pkt_size = bytes_size,
+      .vm_pkt_iov = &packets_iovec,
+      .vm_pkt_iovcnt = 1,
+      .vm_flags = 0,
+  };
+
+  int packets_count = packets.vm_pkt_iovcnt;
+  vmnet_write(interface, &packets, &packets_count);
+}
+
+void _vmnet_read(interface_ref interface, uint64_t max_packet_size,
+                 void **bytes, size_t *bytes_size) {
+  struct iovec packets_iovec = {
+      .iov_base = malloc(max_packet_size),
+      .iov_len = max_packet_size,
+  };
+
+  struct vmpktdesc packets = {
+      .vm_pkt_size = max_packet_size,
+      .vm_pkt_iov = &packets_iovec,
+      .vm_pkt_iovcnt = 1,
+      .vm_flags = 0,
+  };
+
+  int packets_count = 1;
+  vmnet_return_t status = vmnet_read(interface, &packets, &packets_count);
+
+  if (status != VMNET_SUCCESS || packets_count == 0) {
+    return;
+  }
+
+  *bytes = packets.vm_pkt_iov->iov_base;
+  *bytes_size = packets.vm_pkt_size;
+}

proxy.go

@@ -0,0 +1,45 @@
+package main
+
+import (
+	"fmt"
+	"io"
+	"net"
+	"strings"
+
+	"github.com/rs/zerolog/log"
+)
+
+func (s *Server) Proxy(network string, localPort int, remoteAddr string) {
+	l, err := net.Listen(network, fmt.Sprintf("127.0.0.1:%d", localPort))
+	if err != nil {
+		panic(err)
+	}
+	for {
+		conn, err := l.Accept()
+		if err != nil {
+			panic(err)
+		}
+
+		go func(conn net.Conn) {
+			otherConn, err := s.Dial(network, remoteAddr)
+			if err != nil {
+				log.Warn().Msgf("cannot connect to %s: %s", remoteAddr, err)
+				return
+			}
+			log.Info().Msgf("proxied 127.0.0.1:%d to %s", localPort, remoteAddr)
+
+			go Copy(conn, otherConn)
+			go Copy(otherConn, conn)
+		}(conn)
+	}
+}
+
+func Copy(dst io.ReadWriteCloser, src io.ReadWriteCloser) {
+	_, err := io.Copy(dst, src)
+	// this is scuffed but meh
+	if err == nil || err == io.EOF || strings.HasSuffix(err.Error(), "use of closed network connection") {
+		dst.Close()
+	} else {
+		panic(err)
+	}
+}

server.go

@@ -0,0 +1,294 @@
+package main
+
+import (
+	"fmt"
+	"net"
+	"vmnet-proxy/pkg/vmnet"
+
+	"github.com/rs/zerolog/log"
+	"gvisor.dev/gvisor/pkg/buffer"
+	"gvisor.dev/gvisor/pkg/tcpip"
+	"gvisor.dev/gvisor/pkg/tcpip/header"
+	"gvisor.dev/gvisor/pkg/tcpip/network/arp"
+	"gvisor.dev/gvisor/pkg/tcpip/network/ipv4"
+	"gvisor.dev/gvisor/pkg/tcpip/stack"
+	"gvisor.dev/gvisor/pkg/tcpip/transport/tcp"
+	"gvisor.dev/gvisor/pkg/tcpip/transport/udp"
+)
+
+type Server struct {
+	*vmnet.VMNet
+
+	linkHost    tcpip.LinkAddress
+	linkGateway tcpip.LinkAddress
+
+	protoHost    tcpip.AddressWithPrefix
+	protoGateway tcpip.Address
+
+	dispatcher stack.NetworkDispatcher
+	stack      *stack.Stack
+}
+
+func NewServer(hostIface string, linkHostStr string, protoHostStr string, protoGatewayStr string) (*Server, error) {
+	// convert addresses
+	linkHost, err := tcpip.ParseMACAddress(linkHostStr)
+	if err != nil {
+		return nil, fmt.Errorf("parse mac address: %w", err)
+	}
+	protoHostIP, protoHostNet, err := net.ParseCIDR(protoHostStr)
+	if err != nil {
+		return nil, fmt.Errorf("parse host ip: %w", err)
+	}
+	prefixLen, _ := protoHostNet.Mask.Size()
+
+	protoHost := tcpip.AddressWithPrefix{
+		Address:   tcpip.AddrFromSlice(protoHostIP.To4()),
+		PrefixLen: prefixLen,
+	}
+
+	protoGatewayAddr := net.ParseIP(protoGatewayStr)
+	if protoGatewayAddr == nil {
+		return nil, fmt.Errorf("invalid gateway IP: %s", protoGatewayStr)
+	}
+	protoGateway := tcpip.AddrFromSlice(protoGatewayAddr.To4())
+
+	// start vmnet
+	vmn := vmnet.New()
+	if err := vmn.Start(hostIface); err != nil {
+		return nil, err
+	}
+
+	// create server
+	server := &Server{
+		VMNet: vmn,
+
+		linkHost:    linkHost,
+		linkGateway: header.EthernetBroadcastAddress,
+
+		protoHost:    protoHost,
+		protoGateway: protoGateway,
+	}
+
+	// create stack
+	st := stack.New(stack.Options{
+		NetworkProtocols: []stack.NetworkProtocolFactory{
+			ipv4.NewProtocol,
+			arp.NewProtocol,
+		},
+		TransportProtocols: []stack.TransportProtocolFactory{
+			tcp.NewProtocol,
+			udp.NewProtocol,
+		},
+	})
+	if err := st.CreateNIC(1, server); err != nil {
+		panic(err)
+	}
+
+	st.AddProtocolAddress(1, tcpip.ProtocolAddress{
+		Protocol:          header.IPv4ProtocolNumber,
+		AddressWithPrefix: protoHost,
+	}, stack.AddressProperties{})
+	st.SetRouteTable([]tcpip.Route{
+		{
+			Destination: protoHost.Subnet(),
+			NIC:         1,
+		},
+		{
+			Destination: header.IPv4EmptySubnet,
+			NIC:         1,
+			Gateway:     protoGateway,
+		},
+	})
+	server.stack = st
+
+	return server, nil
+}
+
+func (s *Server) Shutdown() {
+	s.stack.Close()
+	s.VMNet.Stop()
+}
+
+// ARPHardwareType implements stack.LinkEndpoint.
+func (s *Server) ARPHardwareType() header.ARPHardwareType {
+	return header.ARPHardwareEther
+}
+
+// AddHeader implements stack.LinkEndpoint.
+func (s *Server) AddHeader(pkt *stack.PacketBuffer) {
+	eth := header.Ethernet(pkt.LinkHeader().Push(header.EthernetMinimumSize))
+	eth.Encode(&header.EthernetFields{
+		Type:    pkt.NetworkProtocolNumber,
+		SrcAddr: pkt.EgressRoute.LocalLinkAddress,
+		DstAddr: pkt.EgressRoute.RemoteLinkAddress,
+	})
+}
+
+// ParseHeader implements stack.LinkEndpoint.
+func (s *Server) ParseHeader(pkt *stack.PacketBuffer) bool {
+	hdrBytes, ok := pkt.LinkHeader().Consume(header.EthernetMinimumSize)
+	if !ok {
+		return false
+	}
+	hdr := header.Ethernet(hdrBytes)
+	pkt.NetworkProtocolNumber = hdr.Type()
+	return true
+}
+
+// Attach implements stack.LinkEndpoint.
+func (s *Server) Attach(dispatcher stack.NetworkDispatcher) {
+	log.Info().Msg("attached dispatcher")
+	s.dispatcher = dispatcher
+}
+
+// Capabilities implements stack.LinkEndpoint.
+func (r *Server) Capabilities() stack.LinkEndpointCapabilities {
+	return stack.CapabilityResolutionRequired
+}
+
+// Close implements stack.LinkEndpoint.
+func (s *Server) Close() {}
+
+// IsAttached implements stack.LinkEndpoint.
+func (s *Server) IsAttached() bool {
+	return s.dispatcher != nil
+}
+
+// LinkAddress implements stack.LinkEndpoint.
+func (s *Server) LinkAddress() tcpip.LinkAddress {
+	return s.linkHost
+}
+
+// MTU implements stack.LinkEndpoint.
+func (s *Server) MTU() uint32 {
+	return 1500
+}
+
+// MaxHeaderLength implements stack.LinkEndpoint.
+func (s *Server) MaxHeaderLength() uint16 {
+	return header.EthernetMinimumSize
+}
+
+// SetLinkAddress implements stack.LinkEndpoint.
+func (s *Server) SetLinkAddress(addr tcpip.LinkAddress) {
+	s.linkHost = addr
+}
+
+// SetMTU implements stack.LinkEndpoint.
+func (s *Server) SetMTU(mtu uint32) {}
+
+// SetOnCloseAction implements stack.LinkEndpoint.
+func (s *Server) SetOnCloseAction(func()) {}
+
+// Wait implements stack.LinkEndpoint.
+func (s *Server) Wait() {}
+
+// WritePackets implements stack.LinkEndpoint.
+func (s *Server) WritePackets(pkts stack.PacketBufferList) (int, tcpip.Error) {
+	var n int
+	for _, pkt := range pkts.AsSlice() {
+		buf := pkt.ToBuffer()
+		data := buf.Flatten()
+
+		ether := header.Ethernet(data)
+		PrintPacket("put", ether)
+
+		_, err := s.Write(data)
+		if err != nil {
+			return n, &tcpip.ErrNotConnected{}
+		}
+		n++
+	}
+	return n, nil
+}
+
+func (r *Server) Loop() {
+	for {
+		bytes := make([]byte, r.MaxPacketSize)
+		bytesLen, err := r.Read(bytes)
+		if err != nil {
+			log.Error().Msgf("error while reading from vmnet: %s", err.Error())
+			continue
+		}
+
+		bytes = bytes[:bytesLen]
+
+		r.HandlePacket(bytes)
+	}
+}
+
+func (s *Server) HandlePacket(data []byte) {
+	ether := header.Ethernet(data)
+
+	if ether.DestinationAddress() != s.linkHost && ether.DestinationAddress() != header.EthernetBroadcastAddress {
+		// who the fuck are you
+		return
+	}
+
+	PrintPacket("got", ether)
+
+	payload := ether[header.EthernetMinimumSize:]
+
+	buf := stack.NewPacketBuffer(stack.PacketBufferOptions{
+		Payload: buffer.MakeWithData(payload),
+	})
+
+	if s.dispatcher != nil {
+		s.dispatcher.DeliverNetworkPacket(ether.Type(), buf)
+	}
+}
+
+func PrintPacket(what string, ether header.Ethernet) {
+	defer recover()
+	PrintPacketUnsafe(what, ether)
+}
+
+func PrintPacketUnsafe(what string, ether header.Ethernet) {
+	log.Trace().Msgf(
+		"%s Ethernet %d (%d bytes) from %s to %s",
+		what, ether.Type(), len(ether),
+		ether.SourceAddress().String(),
+		ether.DestinationAddress().String(),
+	)
+
+	payload := ether[header.EthernetMinimumSize:]
+
+	switch ether.Type() {
+	case header.ARPProtocolNumber:
+		arp := header.ARP(payload)
+		var typ string
+		if arp.Op() == header.ARPRequest {
+			typ = "Request"
+		} else {
+			typ = "Reply"
+		}
+		linkSrc := tcpip.LinkAddress(arp.HardwareAddressSender())
+		linkDst := tcpip.LinkAddress(arp.HardwareAddressTarget())
+		protoSrc := tcpip.AddrFromSlice(arp.ProtocolAddressSender())
+		protoDst := tcpip.AddrFromSlice(arp.ProtocolAddressTarget())
+		log.Trace().Msgf("\tARP %s from %s (%s) to %s (%s)", typ, protoSrc, linkSrc, protoDst, linkDst)
+
+	case header.IPv4ProtocolNumber:
+		ipv4 := header.IPv4(payload)
+		log.Trace().Msgf("\tIPv4 %d from %s to %s", ipv4.TransportProtocol(), ipv4.SourceAddress().String(), ipv4.DestinationAddress().String())
+		payload := ipv4[header.IPv4MinimumSize:]
+		switch ipv4.TransportProtocol() {
+		case header.ICMPv4ProtocolNumber:
+			icmp := header.ICMPv4(payload)
+			size := header.ICMPv4MinimumSize + len(icmp.Payload())
+			log.Trace().Msgf("\t\tICMPv4: %d bytes from %s: icmp_seq=%d ttl=%d", size, ipv4.SourceAddress(), icmp.Sequence(), ipv4.TTL())
+		case header.UDPProtocolNumber:
+			udp := header.UDP(payload)
+			log.Trace().Msgf("\t\tUDP from port %d to port %d: %d bytes", udp.SourcePort(), udp.DestinationPort(), udp.Length())
+			if udp.DestinationPort() == 4444 {
+				log.Trace().Msgf("\t\t\twoof! %s", string(udp.Payload()))
+			}
+		case header.TCPProtocolNumber:
+			tcp := header.TCP(payload)
+			log.Trace().Msgf("\t\tTCP %s from %d to %d", tcp.Flags().String(), tcp.SourcePort(), tcp.DestinationPort())
+		}
+	case header.IPv6ProtocolNumber:
+		ipv6 := header.IPv6(payload)
+		log.Trace().Msgf("\tIPv6 %d from %s to %s", ipv6.TransportProtocol(), ipv6.SourceAddress().String(), ipv6.DestinationAddress().String())
+	}
+}