commit b82f561ac68317e50a3e782109567491f05f303c Author: Kevin Cotugno Date: Sun Dec 18 07:32:20 2022 -0700 Initial commit diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..f71d4a2 --- /dev/null +++ b/.gitignore @@ -0,0 +1 @@ +dlnaprox diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..1840fd9 --- /dev/null +++ b/LICENSE @@ -0,0 +1,674 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 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 General Public License is a free, copyleft license for +software and other kinds of works. + + 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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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. 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If not, see . + +Also add information on how to contact you by electronic and paper mail. + + If the program does terminal interaction, make it output a short +notice like this when it starts in an interactive mode: + + Copyright (C) + This program comes with ABSOLUTELY NO WARRANTY; for details type 'show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type 'show c' for details. + +The hypothetical commands 'show w' and 'show c' should show the appropriate +parts of the General Public License. Of course, your program's commands +might be different; for a GUI interface, you would use an "about box". + + 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 GPL, see +. + + The GNU General Public License does not permit incorporating your program +into proprietary programs. If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +. diff --git a/cmd/root.go b/cmd/root.go new file mode 100644 index 0000000..c44e0f8 --- /dev/null +++ b/cmd/root.go @@ -0,0 +1,72 @@ +package cmd + +import ( + "net" + "os" + "time" + + "code.cotugno.family/kevin/dlnaprox/internal" + "github.com/rs/zerolog" + "github.com/rs/zerolog/log" + "github.com/spf13/cobra" +) + +var ( + opts internal.Options + debug bool + trace bool +) + +var rootCmd = &cobra.Command{ + Use: "dnlaprox", + Short: "Proxy multicast packets to another nextwork", + Long: `Proxy multicast packets to another nextwork + +dnlaprox Copyright (C) 2022 Kevin Cotugno +This program comes with ABSOLUTELY NO WARRANTY. +This is free software, and you are welcome to redistribute it +under certain conditions.`, + Run: func(cmd *cobra.Command, args []string) { + var level zerolog.Level + if trace { + level = zerolog.TraceLevel + } else if debug { + level = zerolog.DebugLevel + } else { + level = zerolog.InfoLevel + } + + log.Logger = zerolog.New(zerolog.ConsoleWriter{Out: os.Stderr, TimeFormat: time.RFC3339Nano}). + With(). + Timestamp(). + Logger(). + Level(level) + + if err := internal.Start(opts); err != nil { + log.Err(err).Send() + } + }, +} + +// Execute adds all child commands to the root command and sets flags appropriately. +// This is called by main.main(). It only needs to happen once to the rootCmd. +func Execute() { + err := rootCmd.Execute() + if err != nil { + os.Exit(1) + } +} + +func init() { + rootCmd.Flags().IPVar(&opts.OuterIP, "outer-ip", net.IP{}, "Specific IP address to bind to for the outer network") + rootCmd.Flags().IPNetVarP(&opts.InnerNetwork, "inner-network", "i", net.IPNet{}, "IP address with network mask to denote the inner network") + rootCmd.Flags().IPNetVarP(&opts.OuterNetwork, "outer-network", "o", net.IPNet{}, "IP address with network mask to denote the outer network") + rootCmd.Flags().BoolVarP(&opts.Rewrite, "rewrite", "r", false, "Rewrite outgoing packet payloads with the outer network IP address in place of internal network IP") + rootCmd.Flags().StringVar(&opts.Replacement, "replacement", "", "Explicit replacement in place of the outer network IP") + rootCmd.Flags().StringVar(&opts.MatchPrefix, "prefix", "", "Also match this prefix to a matched IP for rewriting") + rootCmd.Flags().StringVar(&opts.MatchPostfix, "postfix", "", "Also match this postfix to a matched IP for rewriting") + rootCmd.Flags().BoolVar(&debug, "debug", false, "Print debug log events") + rootCmd.Flags().BoolVar(&trace, "trace", false, "Print trace log events") + rootCmd.MarkFlagRequired("inner-network") + rootCmd.MarkFlagRequired("outer-network") +} diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..d5921ac --- /dev/null +++ b/go.mod @@ -0,0 +1,29 @@ +module code.cotugno.family/kevin/dlnaprox + +go 1.19 + +require ( + github.com/fsnotify/fsnotify v1.6.0 // indirect + github.com/hashicorp/hcl v1.0.0 // indirect + github.com/inconshreveable/mousetrap v1.1.0 // indirect + github.com/magiconair/properties v1.8.6 // indirect + github.com/mattn/go-colorable v0.1.13 // indirect + github.com/mattn/go-isatty v0.0.16 // indirect + github.com/mitchellh/mapstructure v1.5.0 // indirect + github.com/pelletier/go-toml v1.9.5 // indirect + github.com/pelletier/go-toml/v2 v2.0.5 // indirect + github.com/rs/zerolog v1.28.0 // indirect + github.com/spf13/afero v1.9.2 // indirect + github.com/spf13/cast v1.5.0 // indirect + github.com/spf13/cobra v1.6.1 // indirect + github.com/spf13/jwalterweatherman v1.1.0 // indirect + github.com/spf13/pflag v1.0.5 // indirect + github.com/spf13/viper v1.14.0 // indirect + github.com/subosito/gotenv v1.4.1 // indirect + golang.org/x/net v0.4.0 // indirect + golang.org/x/sys v0.3.0 // indirect + golang.org/x/text v0.5.0 // indirect + gopkg.in/ini.v1 v1.67.0 // indirect + gopkg.in/yaml.v2 v2.4.0 // indirect + gopkg.in/yaml.v3 v3.0.1 // indirect +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..fae7f0a --- /dev/null +++ b/go.sum @@ -0,0 +1,496 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU= 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*Proxy +} + +func NewConn(p *Proxy, iface net.Interface, localIP net.IP, src *net.UDPAddr, out chan<- Message) (c *Conn, err error) { + c = &Conn{ + ID: connId.Add(1), + Src: src, + Iface: iface, + Timeout: time.Now().Add(10 * time.Second), + mu: &sync.Mutex{}, + out: out, + proxy: p, + } + + c.socket, err = net.ListenUDP("udp4", &net.UDPAddr{IP: localIP}) + if err != nil { + return + } + + var a netip.AddrPort + a, err = netip.ParseAddrPort(c.socket.LocalAddr().String()) + if err != nil { + return + } + c.Dst = net.UDPAddrFromAddrPort(a) + if c.Dst.IP.String() == "0.0.0.0" { + fmt.Println(localIP) + panic(c) + } + + log.Debug(). + Str("src", c.Src.String()). + Str("dst", c.Dst.String()). + Msg("Opened socket") + + go c.Read() + return +} + +func (c *Conn) Close() { + c.mu.Lock() + defer c.mu.Unlock() + + if c.closed.Load() { + return + } + + c.closed.Store(true) + + if c.socket == nil { + return + } + + if err := c.socket.Close(); err != nil { + log.Err(err).Msg("Failed closing socket") + } + + log.Debug(). + Str("src", c.Src.String()). + Str("dst", c.Dst.String()). + Msg("Closed socket") +} + +func (c *Conn) Send(msg Message) { + c.mu.Lock() + defer c.mu.Unlock() + + if c.closed.Load() { + return + } + msg.Log(log.Info()). + Msg("Writing packet") + + wrote, err := c.socket.WriteTo(msg.Data, msg.Dst) + if err == nil && wrote != msg.Len { + msg.Log(log.Error()). + Int("wrote", wrote). + Str("interface", c.Iface.Name). + Msg("Failed to write full packet") + } else if err != nil { + msg.Log(log.Err(err)). + Str("interface", c.Iface.Name). + Msg("Failed to write packet") + } + + return +} + +func (c *Conn) Read() { + defer log.Debug(). + Uint64("conn_id", c.ID). + Str("src", c.Src.String()). + Str("dst", c.Dst.String()). + Msg("Connection read closed") + + var buf [4096]byte + for !c.closed.Load() { + read, src, err := c.socket.ReadFrom(buf[:]) + if err != nil { + if !errors.Is(err, net.ErrClosed) { + log.Err(err). + Msg("Failed to read from socket") + c.Close() + } + break + } + + msg, err := NewMessage(buf[:read], src, c.Src) + if err != nil { + log.Err(err). + Msg("Failed to parse message") + continue + } + + if c.Iface.Index == c.proxy.inner.iface.Index { + c.proxy.rewritePacket(&msg, c.Iface) + } + + msg.Log(log.Debug()). + Msg("Read from socket") + + msg.Log(log.Trace()). + Str("side", "receive"). + Str("message", string(msg.Data)). + Send() + + c.out <- msg + } +} + +func (c *Conn) LocalAddrPort() net.Addr { + return c.socket.LocalAddr() +} diff --git a/internal/conn_table.go b/internal/conn_table.go new file mode 100644 index 0000000..d7e7fb9 --- /dev/null +++ b/internal/conn_table.go @@ -0,0 +1,86 @@ +package internal + +import ( + "net" + "sync" + "time" + + "github.com/rs/zerolog/log" +) + +type ConnTable struct { + idTable map[uint64]*Conn + srcTable map[string]*Conn + dstTable map[string]*Conn + mu *sync.Mutex + out chan<- Message + proxy *Proxy +} + +func NewConnTable(p *Proxy, out chan<- Message) *ConnTable { + return &ConnTable{ + idTable: make(map[uint64]*Conn), + srcTable: make(map[string]*Conn), + dstTable: make(map[string]*Conn), + mu: &sync.Mutex{}, + out: out, + proxy: p, + } +} + +func (c *ConnTable) Get(iface net.Interface, localIP net.IP, src, dst *net.UDPAddr) (*Conn, error) { + c.mu.Lock() + defer c.mu.Unlock() + + log.Trace().Str("dst", dst.String()).Msg("Getting connection") + + srcConn, srcOk := c.srcTable[src.String()] + dstConn, dstOk := c.dstTable[dst.String()] + + if srcOk { + return srcConn, nil + } else if dstOk { + return dstConn, nil + } + + ip := make(net.IP, 4) + copy(ip, localIP.To4()) + conn, err := NewConn(c.proxy, iface, ip, src, c.out) + if err != nil { + return nil, err + } + c.idTable[conn.ID] = conn + c.srcTable[conn.Src.String()] = conn + c.dstTable[conn.Dst.String()] = conn + go c.watchForTimeout(conn) + + return conn, nil +} + +func (c *ConnTable) watchForTimeout(conn *Conn) { + var shouldClose bool + defer func() { + conn.Close() + c.mu.Lock() + defer c.mu.Unlock() + + delete(c.idTable, conn.ID) + delete(c.srcTable, conn.Src.String()) + delete(c.dstTable, conn.Dst.String()) + }() + + for !shouldClose { + conn.mu.Lock() + if conn.Timeout.Before(time.Now()) || conn.closed.Load() { + shouldClose = true + log.Debug(). + Uint64("conn_id", conn.ID). + Msg("Connection timed-out") + } + conn.mu.Unlock() + + if !shouldClose { + time.Sleep(conn.Timeout.Sub(time.Now())) + } + } +} diff --git a/internal/message.go b/internal/message.go new file mode 100644 index 0000000..bbb87b1 --- /dev/null +++ b/internal/message.go @@ -0,0 +1,63 @@ +package internal + +import ( + "fmt" + "hash/crc32" + "net" + "net/netip" + "sync/atomic" + "time" + + "github.com/rs/zerolog" +) + +var messageID = atomic.Uint64{} + +type Message struct { + ID uint64 + Data []byte + Len int + + Src *net.UDPAddr + Dst *net.UDPAddr + + Checksum string + Timestamp time.Time +} + +func NewMessage(data []byte, src net.Addr, dst net.Addr) (msg Message, err error) { + msg.SetData(data) + + var addr netip.AddrPort + addr, err = netip.ParseAddrPort(src.String()) + if err != nil { + return + } + msg.Src = net.UDPAddrFromAddrPort(addr) + + addr, err = netip.ParseAddrPort(dst.String()) + if err != nil { + return + } + msg.Dst = net.UDPAddrFromAddrPort(addr) + msg.Timestamp = time.Now() + msg.ID = messageID.Add(1) + + return +} + +func (m Message) Log(event *zerolog.Event) *zerolog.Event { + return event. + Uint64("id", m.ID). + Int("length", m.Len). + Str("src", m.Src.String()). + Str("dst", m.Dst.String()). + Str("checksum", m.Checksum) +} + +func (m *Message) SetData(data []byte) { + m.Data = make([]byte, len(data)) + copy(m.Data, data) + m.Len = len(m.Data) + m.Checksum = fmt.Sprintf("%04X", crc32.ChecksumIEEE(m.Data)) +} diff --git a/internal/options.go b/internal/options.go new file mode 100644 index 0000000..b5c589f --- /dev/null +++ b/internal/options.go @@ -0,0 +1,13 @@ +package internal + +import "net" + +type Options struct { + OuterIP net.IP + InnerNetwork net.IPNet + OuterNetwork net.IPNet + Rewrite bool + Replacement string + MatchPrefix string + MatchPostfix string +} diff --git a/internal/proxy.go b/internal/proxy.go new file mode 100644 index 0000000..c8e49c3 --- /dev/null +++ b/internal/proxy.go @@ -0,0 +1,351 @@ +package internal + +import ( + "errors" + "fmt" + "net" + "os" + "regexp" + "runtime" + "sync" + "time" + + "github.com/rs/zerolog/log" + "golang.org/x/net/ipv4" + "golang.org/x/sys/unix" +) + +const ipRegexSrc = `[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}` + +var NoInterfaceFound = errors.New("Couldn't find interface for network") +var InnerNetworkNotMulticast = errors.New("Inner network interface is not multicast") +var OuterNetworkNotMulticast = errors.New("Outer network interface is not multicast") + +var multicastAddr = net.IPv4(239, 255, 255, 250) + +var ipRegex = regexp.MustCompile(ipRegexSrc) + +type netGroup struct { + iface net.Interface + ip net.IP + net *net.IPNet +} + +type Proxy struct { + inner netGroup + outer netGroup + + matchRegex *regexp.Regexp + + opts Options +} + +func NewProxy(opts Options) (proxy Proxy, err error) { + if opts.InnerNetwork.Contains(opts.OuterNetwork.IP) || opts.OuterNetwork.Contains(opts.InnerNetwork.IP) { + err = errors.New("Networks cannot overlap") + return + } + + interfaces, err := net.Interfaces() + if err != nil { + return + } + + for _, iface := range interfaces { + var addrs []net.Addr + addrs, err = iface.Addrs() + if err != nil { + return + } + + for _, addr := range addrs { + var ip net.IP + var ipNet *net.IPNet + ip, ipNet, err = net.ParseCIDR(addr.String()) + if err != nil { + return + } + + if opts.InnerNetwork.IP.Equal(ipNet.IP) && opts.InnerNetwork.Mask.String() == ipNet.Mask.String() { + log.Debug(). + IPAddr("ip", ip). + Str("interface", iface.Name). + Msg("found inner network interface") + + proxy.inner = netGroup{ + iface: iface, + ip: ip, + net: ipNet, + } + break + } else if opts.OuterIP.Equal(ip) || (opts.OuterIP.IsUnspecified() && opts.OuterNetwork.IP.Equal(ipNet.IP) && opts.OuterNetwork.Mask.String() == ipNet.Mask.String()) { + log.Debug(). + IPAddr("ip", ip). + Str("interface", iface.Name). + Msg("found outer network interface") + + proxy.outer = netGroup{ + iface: iface, + ip: ip, + net: ipNet, + } + break + } + } + } + + if proxy.inner.iface.Index == 0 || proxy.outer.iface.Index == 0 { + err = NoInterfaceFound + return + } + + if (proxy.inner.iface.Flags & net.FlagMulticast) == 0 { + err = InnerNetworkNotMulticast + return + } else if (proxy.outer.iface.Flags & net.FlagMulticast) == 0 { + err = OuterNetworkNotMulticast + return + } + + proxy.opts = opts + err = proxy.buildRegex() + return +} + +func (p Proxy) Run() { + var wg sync.WaitGroup + + chan1 := make(chan Message, 16) + chan2 := make(chan Message, 16) + + go func() { + for { + log.Debug().Int("goroutines", runtime.NumGoroutine()).Send() + time.Sleep(3 * time.Second) + } + }() + + wg.Add(1) + go func() { + defer wg.Done() + + p.handleInterface(p.inner, chan1, chan2, true) + }() + + wg.Add(1) + go func() { + defer wg.Done() + + p.handleInterface(p.outer, chan2, chan1, false) + }() + + wg.Wait() +} + +func (p *Proxy) handleInterface(group netGroup, in <-chan Message, out chan<- Message, rewrite bool) { + var wg sync.WaitGroup + + defer fmt.Println("done " + group.iface.Name) + defer wg.Wait() + defer close(out) + defer fmt.Println("closing " + group.iface.Name) + + conn, err := newMuticastSocket(group.iface) + if err != nil { + log.Err(err).Msg("Failed to open multicast socker") + os.Exit(1) + } + + conns := NewConnTable(p, out) + go func() { + for { + time.Sleep(3 * time.Second) + conns.mu.Lock() + log.Debug(). + Int("src_table_count", len(conns.srcTable)). + Int("dst_table_count", len(conns.dstTable)). + Str("interface", group.iface.Name). + Interface("src_table", conns.srcTable). + Interface("dst_table", conns.dstTable). + Interface("id_table", conns.idTable). + Send() + conns.mu.Unlock() + } + }() + + wg.Add(1) + go func() { + defer wg.Done() + + for msg := range in { + conn, err := conns.Get(group.iface, group.ip, msg.Src, msg.Dst) + if err != nil { + msg.Log(log.Err(err)). + Str("interface", group.iface.Name). + Msg("Failed to get UDP socket") + } + conn.Send(msg) + + msg.Log(log.Trace()). + Str("type", "send"). + Str("message", string(msg.Data)). + Send() + } + }() + + var buf [4096]byte + for { + read, _, from, err := conn.ReadFrom(buf[:]) + if err != nil { + log.Err(err). + Str("interface", group.iface.Name). + Msg("Failed to read from socket") + os.Exit(1) + } + + msg, err := NewMessage(buf[:read], from, &net.UDPAddr{IP: multicastAddr, Port: 1900}) + if err != nil { + log.Err(err). + Msg("Failed to parse message") + } + if msg.Src.IP.String() == "0.0.0.0" || msg.Dst.IP.String() == "0.0.0.0" { + panic(msg) + } + + event := msg.Log(log.Debug()). + Str("interface", group.iface.Name) + + if p.inner.ip.Equal(msg.Src.IP) || p.outer.ip.Equal(msg.Src.IP) { + event.Msg("Ignoring packet from local interface") + continue + } + + event.Msg("Read from socket") + + msg.Log(log.Trace()). + Str("side", "receive"). + Str("message", string(msg.Data)). + Send() + + if p.inner.iface.Index == group.iface.Index { + p.rewritePacket(&msg, group.iface) + } + + out <- msg + } +} + +func (p *Proxy) rewritePacket(msg *Message, iface net.Interface) { + if !p.opts.Rewrite { + return + } + + msg.Log(log.Debug()). + Msg("Rewriting packet") + + data := p.matchRegex.ReplaceAllFunc(msg.Data, func(match []byte) []byte { + ipMatch := ipRegex.Find(match) + + matchIP := net.ParseIP(string(ipMatch)) + if matchIP == nil { + msg.Log(log.Warn()). + Str("source", msg.Src.String()). + Str("interface", iface.Name). + Msg("Matched IP is not a valid IPv4 address") + return match + } + + if matchIP.IsMulticast() { + return match + } + + if p.opts.InnerNetwork.Contains(matchIP) { + msg.Log(log.Info()). + IPAddr("match", matchIP). + Str("source", msg.Src.String()). + Str("interface", iface.Name). + Msg("Rewriting IP address in message") + + if p.opts.Replacement == "" { + return []byte(p.outer.ip.String()) + } else { + return []byte(p.opts.Replacement) + } + } + + return match + }) + + msg.SetData(data) +} + +func (p *Proxy) buildRegex() error { + if p.opts.MatchPrefix == "" && p.opts.MatchPostfix == "" { + p.matchRegex = ipRegex + } + + r, err := regexp.Compile(p.opts.MatchPrefix + ipRegexSrc + p.opts.MatchPostfix) + + p.matchRegex = r + + return err +} + +func Start(opts Options) error { + proxy, err := NewProxy(opts) + if err != nil { + return err + } + + proxy.Run() + return nil +} + +func newMuticastSocket(iface net.Interface) (*ipv4.PacketConn, error) { + socket, err := unix.Socket(unix.AF_INET, unix.SOCK_DGRAM, unix.IPPROTO_UDP) + if err != nil { + log.Err(err).Msg("Failed to open socket") + return nil, err + } + + if err := unix.SetsockoptInt(socket, unix.SOL_SOCKET, unix.SO_REUSEADDR, 1); err != nil { + log.Err(err).Msg("Failed to set socket option") + return nil, err + } + + if err := unix.SetsockoptString(socket, unix.SOL_SOCKET, unix.SO_BINDTODEVICE, iface.Name); err != nil { + return nil, err + } + + rawSockAddr := &unix.SockaddrInet4{Port: 1900} + copy(rawSockAddr.Addr[:], []byte{239, 255, 255, 250}) + + if err := unix.Bind(socket, rawSockAddr); err != nil { + log.Err(err). + Str("interface", iface.Name). + Msg("Failed to set bind to interface") + return nil, err + } + + f := os.NewFile(uintptr(socket), "") + listener, err := net.FilePacketConn(f) + if err != nil { + log.Err(err).Msg("Failed to listen on multicast address") + return nil, err + } + f.Close() + + conn := ipv4.NewPacketConn(listener) + + if err := conn.JoinGroup(&iface, &net.UDPAddr{IP: multicastAddr}); err != nil { + log.Err(err).Msg("Failed to join multicast group") + return nil, err + } + + if err := conn.SetMulticastLoopback(false); err != nil { + log.Err(err).Msg("Failed to turn off multicast loopback") + return nil, err + } + + return conn, nil +} diff --git a/main.go b/main.go new file mode 100644 index 0000000..e8ef338 --- /dev/null +++ b/main.go @@ -0,0 +1,9 @@ +package main + +import ( + "code.cotugno.family/kevin/dlnaprox/cmd" +) + +func main() { + cmd.Execute() +}