mirror of
https://github.com/cwinfo/yggdrasil-go.git
synced 2024-09-20 13:02:32 +00:00
314 lines
8.1 KiB
Go
314 lines
8.1 KiB
Go
package yggdrasil
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// This communicates with peers via UDP
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// It's not as well tested or debugged as the TCP transport
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// It's intended to use UDP, so debugging/optimzing this is a high priority
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// TODO? use golang.org/x/net/ipv6.PacketConn's ReadBatch and WriteBatch?
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// To send all chunks of a message / recv all available chunks in one syscall
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// Chunks are currently murged, but outgoing messages aren't chunked
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// This is just to support chunking in the future, if it's needed and debugged
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// Basically, right now we might send UDP packets that are too large
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import "net"
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import "time"
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import "sync"
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import "fmt"
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type udpInterface struct {
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core *Core
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sock *net.UDPConn // Or more general PacketConn?
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mutex sync.RWMutex // each conn has an owner goroutine
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conns map[connAddr]*connInfo
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}
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type connAddr string // TODO something more efficient, but still a valid map key
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type connInfo struct {
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addr connAddr
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peer *peer
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linkIn chan []byte
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keysIn chan *udpKeys
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timeout int // count of how many heartbeats have been missed
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in func([]byte)
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out chan []byte
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countIn uint8
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countOut uint8
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}
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type udpKeys struct {
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box boxPubKey
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sig sigPubKey
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}
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func (iface *udpInterface) init(core *Core, addr string) {
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iface.core = core
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udpAddr, err := net.ResolveUDPAddr("udp", addr)
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if err != nil {
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panic(err)
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}
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iface.sock, err = net.ListenUDP("udp", udpAddr)
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if err != nil {
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panic(err)
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}
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iface.conns = make(map[connAddr]*connInfo)
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go iface.reader()
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}
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func (iface *udpInterface) sendKeys(addr connAddr) {
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udpAddr, err := net.ResolveUDPAddr("udp", string(addr))
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if err != nil {
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panic(err)
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}
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msg := []byte{}
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msg = udp_encode(msg, 0, 0, 0, nil)
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msg = append(msg, iface.core.boxPub[:]...)
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msg = append(msg, iface.core.sigPub[:]...)
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iface.sock.WriteToUDP(msg, udpAddr)
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}
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func udp_isKeys(msg []byte) bool {
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keyLen := 3 + boxPubKeyLen + sigPubKeyLen
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return len(msg) == keyLen && msg[0] == 0x00
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}
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func (iface *udpInterface) startConn(info *connInfo) {
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ticker := time.NewTicker(6 * time.Second)
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defer ticker.Stop()
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defer func() {
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// Cleanup
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// FIXME this still leaks a peer struct
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iface.mutex.Lock()
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delete(iface.conns, info.addr)
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iface.mutex.Unlock()
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iface.core.peers.mutex.Lock()
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oldPorts := iface.core.peers.getPorts()
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newPorts := make(map[switchPort]*peer)
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for k, v := range oldPorts {
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newPorts[k] = v
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}
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delete(newPorts, info.peer.port)
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iface.core.peers.putPorts(newPorts)
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iface.core.peers.mutex.Unlock()
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close(info.linkIn)
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close(info.keysIn)
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close(info.out)
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iface.core.log.Println("Removing peer:", info.addr)
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}()
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for {
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select {
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case ks := <-info.keysIn:
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{
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// FIXME? need signatures/sequence-numbers or something
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// Spoofers could lock out a peer with fake/bad keys
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if ks.box == info.peer.box && ks.sig == info.peer.sig {
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info.timeout = 0
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}
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}
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case <-ticker.C:
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{
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if info.timeout > 10 {
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return
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}
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info.timeout++
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iface.sendKeys(info.addr)
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}
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}
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}
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}
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func (iface *udpInterface) handleKeys(msg []byte, addr connAddr) {
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//defer util_putBytes(msg)
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var ks udpKeys
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_, _, _, bs := udp_decode(msg)
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switch {
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case !wire_chop_slice(ks.box[:], &bs):
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return
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case !wire_chop_slice(ks.sig[:], &bs):
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return
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}
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if ks.box == iface.core.boxPub {
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return
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}
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if ks.sig == iface.core.sigPub {
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return
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}
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iface.mutex.RLock()
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conn, isIn := iface.conns[addr]
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iface.mutex.RUnlock() // TODO? keep the lock longer?...
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if !isIn {
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udpAddr, err := net.ResolveUDPAddr("udp", string(addr))
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if err != nil {
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panic(err)
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}
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conn = &connInfo{
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addr: connAddr(addr),
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peer: iface.core.peers.newPeer(&ks.box, &ks.sig),
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linkIn: make(chan []byte, 1),
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keysIn: make(chan *udpKeys, 1),
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out: make(chan []byte, 1024),
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}
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/*
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conn.in = func (msg []byte) { conn.peer.handlePacket(msg, conn.linkIn) }
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conn.peer.out = func (msg []byte) {
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start := time.Now()
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iface.sock.WriteToUDP(msg, udpAddr)
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timed := time.Since(start)
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conn.peer.updateBandwidth(len(msg), timed)
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util_putBytes(msg)
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} // Old version, always one syscall per packet
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//*/
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/*
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conn.peer.out = func (msg []byte) {
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defer func() { recover() }()
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select {
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case conn.out<-msg:
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default: util_putBytes(msg)
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}
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}
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go func () {
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for msg := range conn.out {
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start := time.Now()
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iface.sock.WriteToUDP(msg, udpAddr)
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timed := time.Since(start)
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conn.peer.updateBandwidth(len(msg), timed)
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util_putBytes(msg)
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}
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}()
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//*/
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//*
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var inChunks uint8
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var inBuf []byte
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conn.in = func(bs []byte) {
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//defer util_putBytes(bs)
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chunks, chunk, count, payload := udp_decode(bs)
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//iface.core.log.Println("DEBUG:", addr, chunks, chunk, count, len(payload))
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//iface.core.log.Println("DEBUG: payload:", payload)
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if count != conn.countIn {
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inChunks = 0
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inBuf = inBuf[:0]
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conn.countIn = count
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}
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if chunk <= chunks && chunk == inChunks+1 {
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//iface.core.log.Println("GOING:", addr, chunks, chunk, count, len(payload))
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inChunks += 1
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inBuf = append(inBuf, payload...)
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if chunks != chunk {
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return
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}
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msg := append(util_getBytes(), inBuf...)
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conn.peer.handlePacket(msg, conn.linkIn)
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//iface.core.log.Println("DONE:", addr, chunks, chunk, count, len(payload))
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}
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}
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conn.peer.out = func(msg []byte) {
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defer func() { recover() }()
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select {
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case conn.out <- msg:
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default:
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util_putBytes(msg)
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}
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}
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go func() {
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//var chunks [][]byte
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var out []byte
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for msg := range conn.out {
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var chunks [][]byte
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bs := msg
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for len(bs) > udp_chunkSize {
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chunks, bs = append(chunks, bs[:udp_chunkSize]), bs[udp_chunkSize:]
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}
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chunks = append(chunks, bs)
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//iface.core.log.Println("DEBUG: out chunks:", len(chunks), len(msg))
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if len(chunks) > 255 {
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continue
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}
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start := time.Now()
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for idx, bs := range chunks {
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nChunks, nChunk, count := uint8(len(chunks)), uint8(idx)+1, conn.countOut
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out = udp_encode(out[:0], nChunks, nChunk, count, bs)
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//iface.core.log.Println("DEBUG out:", nChunks, nChunk, count, len(bs))
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iface.sock.WriteToUDP(out, udpAddr)
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}
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timed := time.Since(start)
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conn.countOut += 1
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conn.peer.updateBandwidth(len(msg), timed)
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util_putBytes(msg)
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}
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}()
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//*/
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iface.mutex.Lock()
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iface.conns[addr] = conn
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iface.mutex.Unlock()
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themNodeID := getNodeID(&ks.box)
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themAddr := address_addrForNodeID(themNodeID)
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themAddrString := net.IP(themAddr[:]).String()
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themString := fmt.Sprintf("%s@%s", themAddrString, addr)
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iface.core.log.Println("Adding peer:", themString)
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go iface.startConn(conn)
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go conn.peer.linkLoop(conn.linkIn)
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iface.sendKeys(conn.addr)
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}
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func() {
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defer func() { recover() }()
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select {
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case conn.keysIn <- &ks:
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default:
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}
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}()
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}
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func (iface *udpInterface) handlePacket(msg []byte, addr connAddr) {
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iface.mutex.RLock()
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if conn, isIn := iface.conns[addr]; isIn {
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conn.in(msg)
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}
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iface.mutex.RUnlock()
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}
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func (iface *udpInterface) reader() {
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bs := make([]byte, 2048) // This needs to be large enough for everything...
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for {
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//iface.core.log.Println("Starting read")
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n, udpAddr, err := iface.sock.ReadFromUDP(bs)
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//iface.core.log.Println("Read", n, udpAddr.String(), err)
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if err != nil {
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panic(err)
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break
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}
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if n > 1500 {
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panic(n)
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}
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//msg := append(util_getBytes(), bs[:n]...)
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msg := bs[:n]
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addr := connAddr(udpAddr.String())
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if udp_isKeys(msg) {
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var them address
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copy(them[:], udpAddr.IP.To16())
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if them.isValid() {
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continue
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}
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if udpAddr.IP.IsLinkLocalUnicast() &&
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!iface.core.ifceExpr.MatchString(udpAddr.Zone) {
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continue
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}
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iface.handleKeys(msg, addr)
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} else {
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iface.handlePacket(msg, addr)
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}
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}
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}
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////////////////////////////////////////////////////////////////////////////////
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const udp_chunkSize = 65535
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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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chunks, chunk, count, payload = bs[0], bs[1], bs[2], bs[3:]
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}
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return
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}
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func udp_encode(out []byte, chunks, chunk, count uint8, payload []byte) []byte {
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return append(append(out, chunks, chunk, count), payload...)
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}
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