commit 34ac8d12e44e7df16d6686f2e05b63e5938151d7 Author: ptrcnull Date: Fri Nov 15 05:45:55 2024 +0100 feat: initial commit diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..7fcd0fd --- /dev/null +++ b/.gitignore @@ -0,0 +1 @@ +vmnet-proxy diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..29ebfa5 --- /dev/null +++ b/LICENSE @@ -0,0 +1,661 @@ + GNU AFFERO GENERAL PUBLIC LICENSE + Version 3, 19 November 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + 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 +software and other kinds of works, specifically designed to ensure +cooperation with the community in the case of network server software. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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If not, see . + +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 +. \ No newline at end of file diff --git a/README.md b/README.md new file mode 100644 index 0000000..e70110c --- /dev/null +++ b/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/`. diff --git a/dialer.go b/dialer.go new file mode 100644 index 0000000..4dc2da7 --- /dev/null +++ b/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) +} diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..5a1911b --- /dev/null +++ b/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 +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..5ede56c --- /dev/null +++ b/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= diff --git a/main.go b/main.go new file mode 100644 index 0000000..853679c --- /dev/null +++ b/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) +} diff --git a/pkg/vmnet/error.go b/pkg/vmnet/error.go new file mode 100644 index 0000000..475d2e1 --- /dev/null +++ b/pkg/vmnet/error.go @@ -0,0 +1,7 @@ +package vmnet + +import "errors" + +var ( + ErrUnableToStart = errors.New("vmnet: unable to start") +) diff --git a/pkg/vmnet/vmnet.go b/pkg/vmnet/vmnet.go new file mode 100644 index 0000000..21daf07 --- /dev/null +++ b/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{} +} diff --git a/pkg/vmnet/vmnet.h b/pkg/vmnet/vmnet.h new file mode 100644 index 0000000..7776e1d --- /dev/null +++ b/pkg/vmnet/vmnet.h @@ -0,0 +1,13 @@ +#ifndef vmnet_h +#define vmnet_h + +#include +#include + +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 */ diff --git a/pkg/vmnet/vmnet.m b/pkg/vmnet/vmnet.m new file mode 100644 index 0000000..5dfb0b3 --- /dev/null +++ b/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; +} diff --git a/proxy.go b/proxy.go new file mode 100644 index 0000000..9e8e90b --- /dev/null +++ b/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) + } +} diff --git a/server.go b/server.go new file mode 100644 index 0000000..abfaaf2 --- /dev/null +++ b/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()) + } +}