cwinfo/yggdrasil-go
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remove udp.go

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Arceliar 2018-06-06 16:57:36 -05:00
parent 38e7704161
commit fad6f6b50e
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src/yggdrasil/udp.go
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@ -1,374 +0,0 @@
package yggdrasil
// This communicates with peers via UDP
// It's not as well tested or debugged as the TCP transport
// It's intended to use UDP, so debugging/optimzing this is a high priority
// TODO? use golang.org/x/net/ipv6.PacketConn's ReadBatch and WriteBatch?
// To send all chunks of a message / recv all available chunks in one syscall
// That might be faster on supported platforms, but it needs investigation
// Chunks are currently murged, but outgoing messages aren't chunked
// This is just to support chunking in the future, if it's needed and debugged
// Basically, right now we might send UDP packets that are too large
// TODO remove old/unused code and better document live code
import "net"
import "time"
import "sync"
import "fmt"
type udpInterface struct {
core *Core
sock *net.UDPConn // Or more general PacketConn?
mutex sync.RWMutex // each conn has an owner goroutine
conns map[connAddr]*connInfo
}
type connAddr struct {
ip [16]byte
port int
zone string
}
func (c *connAddr) fromUDPAddr(u *net.UDPAddr) {
copy(c.ip[:], u.IP.To16())
c.port = u.Port
c.zone = u.Zone
}
func (c *connAddr) toUDPAddr() *net.UDPAddr {
var u net.UDPAddr
u.IP = make([]byte, 16)
copy(u.IP, c.ip[:])
u.Port = c.port
u.Zone = c.zone
return &u
}
type connInfo struct {
name string
addr connAddr
peer *peer
linkIn chan []byte
keysIn chan *udpKeys
closeIn chan *udpKeys
timeout int // count of how many heartbeats have been missed
in func([]byte)
out chan []byte
countIn uint8
countOut uint8
chunkSize uint16
}
type udpKeys struct {
box boxPubKey
sig sigPubKey
}
func (iface *udpInterface) init(core *Core, addr string) (err error) {
iface.core = core
udpAddr, err := net.ResolveUDPAddr("udp", addr)
if err != nil {
return
}
iface.sock, err = net.ListenUDP("udp", udpAddr)
if err != nil {
return
}
iface.conns = make(map[connAddr]*connInfo)
go iface.reader()
return
}
func (iface *udpInterface) sendKeys(addr connAddr) {
udpAddr := addr.toUDPAddr()
msg := []byte{}
msg = udp_encode(msg, 0, 0, 0, nil)
msg = append(msg, iface.core.boxPub[:]...)
msg = append(msg, iface.core.sigPub[:]...)
iface.sock.WriteToUDP(msg, udpAddr)
}
func (iface *udpInterface) sendClose(addr connAddr) {
udpAddr := addr.toUDPAddr()
msg := []byte{}
msg = udp_encode(msg, 0, 1, 0, nil)
msg = append(msg, iface.core.boxPub[:]...)
msg = append(msg, iface.core.sigPub[:]...)
iface.sock.WriteToUDP(msg, udpAddr)
}
func udp_isKeys(msg []byte) bool {
keyLen := 3 + boxPubKeyLen + sigPubKeyLen
return len(msg) == keyLen && msg[0] == 0x00 && msg[1] == 0x00
}
func udp_isClose(msg []byte) bool {
keyLen := 3 + boxPubKeyLen + sigPubKeyLen
return len(msg) == keyLen && msg[0] == 0x00 && msg[1] == 0x01
}
func (iface *udpInterface) startConn(info *connInfo) {
ticker := time.NewTicker(6 * time.Second)
defer ticker.Stop()
defer func() {
// Cleanup
iface.mutex.Lock()
delete(iface.conns, info.addr)
iface.mutex.Unlock()
iface.core.peers.removePeer(info.peer.port)
close(info.linkIn)
close(info.keysIn)
close(info.closeIn)
close(info.out)
iface.core.log.Println("Removing peer:", info.name)
}()
for {
select {
case ks := <-info.closeIn:
{
if ks.box == info.peer.box && ks.sig == info.peer.sig {
// TODO? secure this somehow
// Maybe add a signature and sequence number (timestamp) to close and keys?
return
}
}
case ks := <-info.keysIn:
{
// FIXME? need signatures/sequence-numbers or something
// Spoofers could lock out a peer with fake/bad keys
if ks.box == info.peer.box && ks.sig == info.peer.sig {
info.timeout = 0
}
}
case <-ticker.C:
{
if info.timeout > 10 {
return
}
info.timeout++
iface.sendKeys(info.addr)
}
}
}
}
func (iface *udpInterface) handleClose(msg []byte, addr connAddr) {
//defer util_putBytes(msg)
var ks udpKeys
_, _, _, bs := udp_decode(msg)
switch {
case !wire_chop_slice(ks.box[:], &bs):
return
case !wire_chop_slice(ks.sig[:], &bs):
return
}
if ks.box == iface.core.boxPub {
return
}
if ks.sig == iface.core.sigPub {
return
}
iface.mutex.RLock()
conn, isIn := iface.conns[addr]
iface.mutex.RUnlock()
if !isIn {
return
}
func() {
defer func() { recover() }()
select {
case conn.closeIn <- &ks:
default:
}
}()
}
func (iface *udpInterface) handleKeys(msg []byte, addr connAddr) {
//defer util_putBytes(msg)
var ks udpKeys
_, _, _, bs := udp_decode(msg)
switch {
case !wire_chop_slice(ks.box[:], &bs):
return
case !wire_chop_slice(ks.sig[:], &bs):
return
}
if ks.box == iface.core.boxPub {
return
}
if ks.sig == iface.core.sigPub {
return
}
iface.mutex.RLock()
conn, isIn := iface.conns[addr]
iface.mutex.RUnlock()
if !isIn {
udpAddr := addr.toUDPAddr()
// Check if we're authorized to connect to this key / IP
// TODO monitor and always allow outgoing connections
if !iface.core.peers.isAllowedEncryptionPublicKey(&ks.box) {
// Allow unauthorized peers if they're link-local
if !udpAddr.IP.IsLinkLocalUnicast() {
return
}
}
themNodeID := getNodeID(&ks.box)
themAddr := address_addrForNodeID(themNodeID)
themAddrString := net.IP(themAddr[:]).String()
themString := fmt.Sprintf("%s@%s", themAddrString, udpAddr.String())
conn = &connInfo{
name: themString,
addr: connAddr(addr),
peer: iface.core.peers.newPeer(&ks.box, &ks.sig),
linkIn: make(chan []byte, 1),
keysIn: make(chan *udpKeys, 1),
closeIn: make(chan *udpKeys, 1),
out: make(chan []byte, 32),
chunkSize: 576 - 60 - 8 - 3, // max safe - max ip - udp header - chunk overhead
}
if udpAddr.IP.IsLinkLocalUnicast() {
ifce, err := net.InterfaceByName(udpAddr.Zone)
if ifce != nil && err == nil {
conn.chunkSize = uint16(ifce.MTU) - 60 - 8 - 3
}
}
var inChunks uint8
var inBuf []byte
conn.in = func(bs []byte) {
//defer util_putBytes(bs)
chunks, chunk, count, payload := udp_decode(bs)
if count != conn.countIn {
if len(inBuf) > 0 {
// Something went wrong
// Forward whatever we have
// Maybe the destination can do something about it
msg := append(util_getBytes(), inBuf...)
conn.peer.handlePacket(msg, conn.linkIn)
}
inChunks = 0
inBuf = inBuf[:0]
conn.countIn = count
}
if chunk <= chunks && chunk == inChunks+1 {
inChunks += 1
inBuf = append(inBuf, payload...)
if chunks != chunk {
return
}
msg := append(util_getBytes(), inBuf...)
conn.peer.handlePacket(msg, conn.linkIn)
inBuf = inBuf[:0]
}
}
conn.peer.out = func(msg []byte) {
defer func() { recover() }()
select {
case conn.out <- msg:
conn.peer.updateQueueSize(1)
default:
util_putBytes(msg)
}
}
go func() {
var out []byte
var chunks [][]byte
for msg := range conn.out {
chunks = chunks[:0]
bs := msg
for len(bs) > int(conn.chunkSize) {
chunks, bs = append(chunks, bs[:conn.chunkSize]), bs[conn.chunkSize:]
}
chunks = append(chunks, bs)
if len(chunks) > 255 {
continue
}
for idx, bs := range chunks {
nChunks, nChunk, count := uint8(len(chunks)), uint8(idx)+1, conn.countOut
out = udp_encode(out[:0], nChunks, nChunk, count, bs)
//iface.core.log.Println("DEBUG out:", nChunks, nChunk, count, len(bs))
iface.sock.WriteToUDP(out, udpAddr)
}
conn.countOut += 1
conn.peer.updateQueueSize(-1)
util_putBytes(msg)
}
}()
//*/
conn.peer.close = func() { iface.sendClose(conn.addr) }
iface.mutex.Lock()
iface.conns[addr] = conn
iface.mutex.Unlock()
iface.core.log.Println("Adding peer:", conn.name)
go iface.startConn(conn)
go conn.peer.linkLoop(conn.linkIn)
iface.sendKeys(conn.addr)
}
func() {
defer func() { recover() }()
select {
case conn.keysIn <- &ks:
default:
}
}()
}
func (iface *udpInterface) handlePacket(msg []byte, addr connAddr) {
iface.mutex.RLock()
if conn, isIn := iface.conns[addr]; isIn {
conn.in(msg)
}
iface.mutex.RUnlock()
}
func (iface *udpInterface) reader() {
iface.core.log.Println("Listening for UDP on:", iface.sock.LocalAddr().String())
bs := make([]byte, 65536) // This needs to be large enough for everything...
for {
n, udpAddr, err := iface.sock.ReadFromUDP(bs)
//iface.core.log.Println("DEBUG: read:", bs[0], bs[1], bs[2], n)
if err != nil {
panic(err)
break
}
msg := bs[:n]
var addr connAddr
addr.fromUDPAddr(udpAddr)
switch {
case udp_isKeys(msg):
var them address
copy(them[:], udpAddr.IP.To16())
if them.isValid() {
continue
}
if udpAddr.IP.IsLinkLocalUnicast() {
if len(iface.core.ifceExpr) == 0 {
break
}
for _, expr := range iface.core.ifceExpr {
if expr.MatchString(udpAddr.Zone) {
iface.handleKeys(msg, addr)
break
}
}
}
case udp_isClose(msg):
iface.handleClose(msg, addr)
default:
iface.handlePacket(msg, addr)
}
}
}
////////////////////////////////////////////////////////////////////////////////
func udp_decode(bs []byte) (chunks, chunk, count uint8, payload []byte) {
if len(bs) >= 3 {
chunks, chunk, count, payload = bs[0], bs[1], bs[2], bs[3:]
}
return
}
func udp_encode(out []byte, chunks, chunk, count uint8, payload []byte) []byte {
return append(append(out, chunks, chunk, count), payload...)
}