mirror of
https://github.com/yggdrasil-network/yggdrasil-go.git
synced 2025-04-28 22:25:07 +03:00
first code/readme/license commit
This commit is contained in:
Arceliar
parent
35852be36d
commit
d7e6d814a0
60 changed files with 9768 additions and 2 deletions
275
src/yggdrasil/udp.go
Normal file
275
src/yggdrasil/udp.go
Normal file
|
|
@ -0,0 +1,275 @@
|
|||
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
|
||||
// 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
|
||||
|
||||
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 string // TODO something more efficient, but still a valid map key
|
||||
type connInfo struct {
|
||||
addr connAddr
|
||||
peer *peer
|
||||
linkIn chan []byte
|
||||
keysIn chan *udpKeys
|
||||
timeout int // count of how many heartbeats have been missed
|
||||
in func([]byte)
|
||||
out chan []byte
|
||||
countIn uint8
|
||||
countOut uint8
|
||||
}
|
||||
|
||||
type udpKeys struct {
|
||||
box boxPubKey
|
||||
sig sigPubKey
|
||||
}
|
||||
|
||||
func (iface *udpInterface) init(core *Core, addr string) {
|
||||
iface.core = core
|
||||
udpAddr, err := net.ResolveUDPAddr("udp", addr)
|
||||
if err != nil { panic(err) }
|
||||
iface.sock, err = net.ListenUDP("udp", udpAddr)
|
||||
if err != nil { panic(err) }
|
||||
iface.conns = make(map[connAddr]*connInfo)
|
||||
go iface.reader()
|
||||
}
|
||||
|
||||
func (iface *udpInterface) sendKeys(addr connAddr) {
|
||||
udpAddr, err := net.ResolveUDPAddr("udp", string(addr))
|
||||
if err != nil { panic(err) }
|
||||
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 udp_isKeys(msg []byte) bool {
|
||||
keyLen := 3 + boxPubKeyLen + sigPubKeyLen
|
||||
return len(msg) == keyLen && msg[0] == 0x00
|
||||
}
|
||||
|
||||
func (iface *udpInterface) startConn(info *connInfo) {
|
||||
ticker := time.NewTicker(6*time.Second)
|
||||
defer ticker.Stop()
|
||||
defer func () {
|
||||
// Cleanup
|
||||
// FIXME this still leaks a peer struct
|
||||
iface.mutex.Lock()
|
||||
delete(iface.conns, info.addr)
|
||||
iface.mutex.Unlock()
|
||||
iface.core.peers.mutex.Lock()
|
||||
oldPorts := iface.core.peers.getPorts()
|
||||
newPorts := make(map[switchPort]*peer)
|
||||
for k,v := range oldPorts{ newPorts[k] = v }
|
||||
delete(newPorts, info.peer.port)
|
||||
iface.core.peers.putPorts(newPorts)
|
||||
iface.core.peers.mutex.Unlock()
|
||||
close(info.linkIn)
|
||||
close(info.keysIn)
|
||||
close(info.out)
|
||||
iface.core.log.Println("Removing peer:", info.addr)
|
||||
}()
|
||||
for {
|
||||
select {
|
||||
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) 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() // TODO? keep the lock longer?...
|
||||
if !isIn {
|
||||
udpAddr, err := net.ResolveUDPAddr("udp", string(addr))
|
||||
if err != nil { panic(err) }
|
||||
conn = &connInfo{
|
||||
addr: connAddr(addr),
|
||||
peer: iface.core.peers.newPeer(&ks.box, &ks.sig),
|
||||
linkIn: make(chan []byte, 1),
|
||||
keysIn: make(chan *udpKeys, 1),
|
||||
out: make(chan []byte, 1024),
|
||||
}
|
||||
/*
|
||||
conn.in = func (msg []byte) { conn.peer.handlePacket(msg, conn.linkIn) }
|
||||
conn.peer.out = func (msg []byte) {
|
||||
start := time.Now()
|
||||
iface.sock.WriteToUDP(msg, udpAddr)
|
||||
timed := time.Since(start)
|
||||
conn.peer.updateBandwidth(len(msg), timed)
|
||||
util_putBytes(msg)
|
||||
} // Old version, always one syscall per packet
|
||||
//*/
|
||||
/*
|
||||
conn.peer.out = func (msg []byte) {
|
||||
defer func() { recover() }()
|
||||
select {
|
||||
case conn.out<-msg:
|
||||
default: util_putBytes(msg)
|
||||
}
|
||||
}
|
||||
go func () {
|
||||
for msg := range conn.out {
|
||||
start := time.Now()
|
||||
iface.sock.WriteToUDP(msg, udpAddr)
|
||||
timed := time.Since(start)
|
||||
conn.peer.updateBandwidth(len(msg), timed)
|
||||
util_putBytes(msg)
|
||||
}
|
||||
}()
|
||||
//*/
|
||||
//*
|
||||
var inChunks uint8
|
||||
var inBuf []byte
|
||||
conn.in = func(bs []byte) {
|
||||
//defer util_putBytes(bs)
|
||||
chunks, chunk, count, payload := udp_decode(bs)
|
||||
//iface.core.log.Println("DEBUG:", addr, chunks, chunk, count, len(payload))
|
||||
//iface.core.log.Println("DEBUG: payload:", payload)
|
||||
if count != conn.countIn {
|
||||
inChunks = 0
|
||||
inBuf = inBuf[:0]
|
||||
conn.countIn = count
|
||||
}
|
||||
if chunk <= chunks && chunk == inChunks + 1 {
|
||||
//iface.core.log.Println("GOING:", addr, chunks, chunk, count, len(payload))
|
||||
inChunks += 1
|
||||
inBuf = append(inBuf, payload...)
|
||||
if chunks != chunk { return }
|
||||
msg := append(util_getBytes(), inBuf...)
|
||||
conn.peer.handlePacket(msg, conn.linkIn)
|
||||
//iface.core.log.Println("DONE:", addr, chunks, chunk, count, len(payload))
|
||||
}
|
||||
}
|
||||
conn.peer.out = func (msg []byte) {
|
||||
defer func() { recover() }()
|
||||
select {
|
||||
case conn.out<-msg:
|
||||
default: util_putBytes(msg)
|
||||
}
|
||||
}
|
||||
go func () {
|
||||
//var chunks [][]byte
|
||||
var out []byte
|
||||
for msg := range conn.out {
|
||||
var chunks [][]byte
|
||||
bs := msg
|
||||
for len(bs) > udp_chunkSize {
|
||||
chunks, bs = append(chunks, bs[:udp_chunkSize]), bs[udp_chunkSize:]
|
||||
}
|
||||
chunks = append(chunks, bs)
|
||||
//iface.core.log.Println("DEBUG: out chunks:", len(chunks), len(msg))
|
||||
if len(chunks) > 255 { continue }
|
||||
start := time.Now()
|
||||
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)
|
||||
}
|
||||
timed := time.Since(start)
|
||||
conn.countOut += 1
|
||||
conn.peer.updateBandwidth(len(msg), timed)
|
||||
util_putBytes(msg)
|
||||
}
|
||||
}()
|
||||
//*/
|
||||
iface.mutex.Lock()
|
||||
iface.conns[addr] = conn
|
||||
iface.mutex.Unlock()
|
||||
themNodeID := getNodeID(&ks.box)
|
||||
themAddr := address_addrForNodeID(themNodeID)
|
||||
themAddrString := net.IP(themAddr[:]).String()
|
||||
themString := fmt.Sprintf("%s@%s", themAddrString, addr)
|
||||
iface.core.log.Println("Adding peer:", themString)
|
||||
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() {
|
||||
bs := make([]byte, 2048) // This needs to be large enough for everything...
|
||||
for {
|
||||
//iface.core.log.Println("Starting read")
|
||||
n, udpAddr, err := iface.sock.ReadFromUDP(bs)
|
||||
//iface.core.log.Println("Read", n, udpAddr.String(), err)
|
||||
if err != nil { panic(err) ; break }
|
||||
if n > 1500 { panic(n) }
|
||||
//msg := append(util_getBytes(), bs[:n]...)
|
||||
msg := bs[:n]
|
||||
addr := connAddr(udpAddr.String())
|
||||
if udp_isKeys(msg) {
|
||||
iface.handleKeys(msg, addr)
|
||||
} else {
|
||||
iface.handlePacket(msg, addr)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
////////////////////////////////////////////////////////////////////////////////
|
||||
|
||||
const udp_chunkSize = 65535
|
||||
|
||||
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...)
|
||||
}
|
||||
|
||||
Loading…
Add table
Add a link
Reference in a new issue