mirror of
https://github.com/cwinfo/yggdrasil-go.git
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Merge pull request #11 from Arceliar/bigmtu
Enable TCP support, switch to it by default, and increase MTU to 65535
This commit is contained in:
Arceliar
GitHub
commit
ec6d749b59
@ -43,6 +43,9 @@ In practice, you probably want to run this instead:
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This keeps a persistent set of keys (and by extension, IP address) and gives you the option of editing the configuration file.
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If you want to use it as an overlay network on top of e.g. the internet, then you can do so by adding the remote devices domain/address and port (as a string, e.g. `"1.2.3.4:5678"`) to the list of `Peers` in the configuration file.
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You can control whether or not it peers over TCP or UDP by adding `tcp:` or `udp:` to the start of the string, i.e. `"udp:1.2.3.4:5678"`.
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It is currently configured to accept incoming TCP and UDP connections.
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In the interest of testing the TCP machinery, it's set to create TCP connections for auto-peering (over link-local IPv6), and to use TCP by default if no transport is specified for a manually configured peer.
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### Platforms
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@ -1,283 +0,0 @@
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package main
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import "bytes"
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import "encoding/hex"
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import "encoding/json"
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import "flag"
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import "fmt"
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import "io/ioutil"
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import "net"
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import "os"
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import "os/signal"
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import "time"
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import "regexp"
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import _ "net/http/pprof"
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import "net/http"
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import "log"
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import "runtime"
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import "golang.org/x/net/ipv6"
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import . "yggdrasil"
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/**
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* This is a very crude wrapper around src/yggdrasil
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* It can generate a new config (--genconf)
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* It can read a config from stdin (--useconf)
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* It can run with an automatic config (--autoconf)
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*/
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type nodeConfig struct {
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Listen string
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AdminListen string
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Peers []string
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BoxPub string
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BoxPriv string
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SigPub string
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SigPriv string
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Multicast bool
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LinkLocal string
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IfName string
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}
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type node struct {
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core Core
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sock *ipv6.PacketConn
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}
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func (n *node) init(cfg *nodeConfig, logger *log.Logger) {
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boxPub, err := hex.DecodeString(cfg.BoxPub)
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if err != nil {
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panic(err)
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}
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boxPriv, err := hex.DecodeString(cfg.BoxPriv)
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if err != nil {
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panic(err)
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}
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sigPub, err := hex.DecodeString(cfg.SigPub)
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if err != nil {
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panic(err)
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}
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sigPriv, err := hex.DecodeString(cfg.SigPriv)
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if err != nil {
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panic(err)
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}
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n.core.DEBUG_init(boxPub, boxPriv, sigPub, sigPriv)
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n.core.DEBUG_setLogger(logger)
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ifceExpr, err := regexp.Compile(cfg.LinkLocal)
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if err != nil {
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panic(err)
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}
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n.core.DEBUG_setIfceExpr(ifceExpr)
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logger.Println("Starting interface...")
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n.core.DEBUG_setupAndStartGlobalTCPInterface(cfg.Listen)
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logger.Println("Started interface")
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logger.Println("Starting admin socket...")
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n.core.DEBUG_setupAndStartAdminInterface(cfg.AdminListen)
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logger.Println("Started admin socket")
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go func() {
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if len(cfg.Peers) == 0 {
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return
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}
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for {
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for _, p := range cfg.Peers {
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n.core.DEBUG_addTCPConn(p)
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time.Sleep(time.Second)
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}
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time.Sleep(time.Minute)
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}
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}()
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}
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func generateConfig() *nodeConfig {
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core := Core{}
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bpub, bpriv := core.DEBUG_newBoxKeys()
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spub, spriv := core.DEBUG_newSigKeys()
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cfg := nodeConfig{}
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cfg.Listen = "[::]:0"
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cfg.AdminListen = "localhost:9001"
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cfg.BoxPub = hex.EncodeToString(bpub[:])
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cfg.BoxPriv = hex.EncodeToString(bpriv[:])
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cfg.SigPub = hex.EncodeToString(spub[:])
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cfg.SigPriv = hex.EncodeToString(spriv[:])
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cfg.Peers = []string{}
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cfg.Multicast = true
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cfg.LinkLocal = ""
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cfg.IfName = "auto"
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return &cfg
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}
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func doGenconf() string {
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cfg := generateConfig()
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bs, err := json.MarshalIndent(cfg, "", " ")
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if err != nil {
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panic(err)
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}
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return string(bs)
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}
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var multicastAddr = "[ff02::114]:9001"
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func (n *node) listen() {
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groupAddr, err := net.ResolveUDPAddr("udp6", multicastAddr)
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if err != nil {
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panic(err)
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}
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bs := make([]byte, 2048)
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for {
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nBytes, rcm, fromAddr, err := n.sock.ReadFrom(bs)
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if err != nil {
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panic(err)
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}
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//if rcm == nil { continue } // wat
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//fmt.Println("DEBUG:", "packet from:", fromAddr.String())
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if rcm != nil {
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// Windows can't set the flag needed to return a non-nil value here
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// So only make these checks if we get something useful back
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// TODO? Skip them always, I'm not sure if they're really needed...
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if !rcm.Dst.IsLinkLocalMulticast() {
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continue
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}
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if !rcm.Dst.Equal(groupAddr.IP) {
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continue
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}
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}
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anAddr := string(bs[:nBytes])
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addr, err := net.ResolveTCPAddr("tcp6", anAddr)
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if err != nil {
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panic(err)
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continue
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} // Panic for testing, remove later
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from := fromAddr.(*net.UDPAddr)
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//fmt.Println("DEBUG:", "heard:", addr.IP.String(), "from:", from.IP.String())
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if addr.IP.String() != from.IP.String() {
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continue
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}
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addr.Zone = from.Zone
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saddr := addr.String()
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//if _, isIn := n.peers[saddr]; isIn { continue }
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//n.peers[saddr] = struct{}{}
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n.core.DEBUG_addTCPConn(saddr)
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//fmt.Println("DEBUG:", "added multicast peer:", saddr)
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}
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}
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func (n *node) announce() {
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groupAddr, err := net.ResolveUDPAddr("udp6", multicastAddr)
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if err != nil {
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panic(err)
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}
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var anAddr net.TCPAddr
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tcpAddr := n.core.DEBUG_getGlobalTCPAddr()
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anAddr.Port = tcpAddr.Port
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destAddr, err := net.ResolveUDPAddr("udp6", multicastAddr)
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if err != nil {
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panic(err)
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}
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for {
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ifaces, err := net.Interfaces()
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if err != nil {
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panic(err)
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}
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for _, iface := range ifaces {
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n.sock.JoinGroup(&iface, groupAddr)
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//err := n.sock.JoinGroup(&iface, groupAddr)
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//if err != nil { panic(err) }
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addrs, err := iface.Addrs()
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if err != nil {
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panic(err)
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}
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for _, addr := range addrs {
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addrIP, _, _ := net.ParseCIDR(addr.String())
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if addrIP.To4() != nil {
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continue
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} // IPv6 only
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if !addrIP.IsLinkLocalUnicast() {
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continue
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}
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anAddr.IP = addrIP
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anAddr.Zone = iface.Name
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destAddr.Zone = iface.Name
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msg := []byte(anAddr.String())
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n.sock.WriteTo(msg, nil, destAddr)
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break
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}
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time.Sleep(time.Second)
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}
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time.Sleep(time.Second)
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}
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}
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var pprof = flag.Bool("pprof", false, "Run pprof, see http://localhost:6060/debug/pprof/")
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var genconf = flag.Bool("genconf", false, "print a new config to stdout")
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var useconf = flag.Bool("useconf", false, "read config from stdin")
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var autoconf = flag.Bool("autoconf", false, "automatic mode (dynamic IP, peer with IPv6 neighbors)")
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func main() {
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flag.Parse()
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var cfg *nodeConfig
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switch {
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case *autoconf:
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cfg = generateConfig()
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case *useconf:
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config, err := ioutil.ReadAll(os.Stdin)
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if err != nil {
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panic(err)
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}
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decoder := json.NewDecoder(bytes.NewReader(config))
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cfg = generateConfig()
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err = decoder.Decode(cfg)
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if err != nil {
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panic(err)
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}
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case *genconf:
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fmt.Println(doGenconf())
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default:
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flag.PrintDefaults()
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}
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if cfg == nil {
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return
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}
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logger := log.New(os.Stdout, "", log.Flags())
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if *pprof {
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runtime.SetBlockProfileRate(1)
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go func() { log.Println(http.ListenAndServe("localhost:6060", nil)) }()
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}
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// Setup
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logger.Println("Initializing...")
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n := node{}
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n.init(cfg, logger)
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logger.Println("Starting tun...")
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//n.core.DEBUG_startTun(cfg.IfName) // 1280, the smallest supported MTU
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n.core.DEBUG_startTunWithMTU(cfg.IfName, 65535) // Largest supported MTU
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defer func() {
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logger.Println("Closing...")
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n.core.DEBUG_stopTun()
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}()
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logger.Println("Started...")
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if cfg.Multicast {
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addr, err := net.ResolveUDPAddr("udp", multicastAddr)
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if err != nil {
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panic(err)
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}
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listenString := fmt.Sprintf("[::]:%v", addr.Port)
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conn, err := net.ListenPacket("udp6", listenString)
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if err != nil {
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panic(err)
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}
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//defer conn.Close() // Let it close on its own when the application exits
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n.sock = ipv6.NewPacketConn(conn)
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if err = n.sock.SetControlMessage(ipv6.FlagDst, true); err != nil {
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// Windows can't set this flag, so we need to handle it in other ways
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//panic(err)
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}
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go n.listen()
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go n.announce()
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}
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// Catch interrupt to exit gracefully
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c := make(chan os.Signal, 1)
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signal.Notify(c, os.Interrupt, os.Kill)
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<-c
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logger.Println("Stopping...")
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}
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@ -319,7 +319,7 @@ func (iface *udpInterface) reader() {
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////////////////////////////////////////////////////////////////////////////////
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const udp_chunkSize = 65535
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const udp_chunkSize = 508 // Apparently the maximum guaranteed safe IPv4 size
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func udp_decode(bs []byte) (chunks, chunk, count uint8, payload []byte) {
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if len(bs) >= 3 {
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26
yggdrasil.go
26
yggdrasil.go
@ -71,7 +71,8 @@ func (n *node) init(cfg *nodeConfig, logger *log.Logger) {
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}
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n.core.DEBUG_setIfceExpr(ifceExpr)
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logger.Println("Starting interface...")
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n.core.DEBUG_setupAndStartGlobalUDPInterface(cfg.Listen)
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n.core.DEBUG_setupAndStartGlobalTCPInterface(cfg.Listen) // Listen for peers on TCP
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n.core.DEBUG_setupAndStartGlobalUDPInterface(cfg.Listen) // Also listen on UDP, TODO allow separate configuration for ip/port to listen on each of these
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logger.Println("Started interface")
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logger.Println("Starting admin socket...")
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n.core.DEBUG_setupAndStartAdminInterface(cfg.AdminListen)
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@ -82,7 +83,14 @@ func (n *node) init(cfg *nodeConfig, logger *log.Logger) {
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}
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for {
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for _, p := range cfg.Peers {
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n.core.DEBUG_maybeSendUDPKeys(p)
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switch {
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case len(p) >= 4 && p[:4] == "udp:":
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n.core.DEBUG_maybeSendUDPKeys(p[4:])
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case len(p) >= 4 && p[:4] == "tcp:":
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n.core.DEBUG_addTCPConn(p[4:])
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default:
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n.core.DEBUG_addTCPConn(p)
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}
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time.Sleep(time.Second)
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}
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time.Sleep(time.Minute)
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@ -144,7 +152,7 @@ func (n *node) listen() {
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}
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}
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anAddr := string(bs[:nBytes])
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addr, err := net.ResolveUDPAddr("udp6", anAddr)
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addr, err := net.ResolveTCPAddr("tcp6", anAddr)
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if err != nil {
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panic(err)
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continue
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@ -158,7 +166,7 @@ func (n *node) listen() {
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saddr := addr.String()
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//if _, isIn := n.peers[saddr]; isIn { continue }
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//n.peers[saddr] = struct{}{}
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n.core.DEBUG_maybeSendUDPKeys(saddr)
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n.core.DEBUG_addTCPConn(saddr) // FIXME? can result in 2 connections per peer
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//fmt.Println("DEBUG:", "added multicast peer:", saddr)
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}
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}
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@ -168,9 +176,9 @@ func (n *node) announce() {
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if err != nil {
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panic(err)
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}
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var anAddr net.UDPAddr
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udpAddr := n.core.DEBUG_getGlobalUDPAddr()
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anAddr.Port = udpAddr.Port
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var anAddr net.TCPAddr
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tcpAddr := n.core.DEBUG_getGlobalTCPAddr()
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anAddr.Port = tcpAddr.Port
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destAddr, err := net.ResolveUDPAddr("udp6", multicastAddr)
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if err != nil {
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panic(err)
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@ -249,8 +257,8 @@ func main() {
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n := node{}
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n.init(cfg, logger)
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logger.Println("Starting tun...")
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n.core.DEBUG_startTun(cfg.IfName) // 1280, the smallest supported MTU
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//n.core.DEBUG_startTunWithMTU(cfg.IfName, 65535) // Largest supported MTU
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//n.core.DEBUG_startTun(cfg.IfName) // 1280, the smallest supported MTU
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n.core.DEBUG_startTunWithMTU(cfg.IfName, 65535) // Largest supported MTU
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defer func() {
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logger.Println("Closing...")
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n.core.DEBUG_stopTun()
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