mirror of
https://github.com/cwinfo/yggdrasil-go.git
synced 2024-11-25 20:41:36 +00:00
Merge pull request #318 from yggdrasil-network/link
Implement link interface
This commit is contained in:
Arceliar
GitHub
commit
f747f259b3
@ -35,22 +35,22 @@ func main() {
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}
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var encryptionKeys []keySet
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for i := 0; i < *numHosts + 1; i++ {
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for i := 0; i < *numHosts+1; i++ {
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encryptionKeys = append(encryptionKeys, newBoxKey())
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}
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encryptionKeys = sortKeySetArray(encryptionKeys)
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for i := 0; i < *keyTries - *numHosts - 1; i++ {
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encryptionKeys[0] = newBoxKey();
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for i := 0; i < *keyTries-*numHosts-1; i++ {
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encryptionKeys[0] = newBoxKey()
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encryptionKeys = bubbleUpTo(encryptionKeys, 0)
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}
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var signatureKeys []keySet
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for i := 0; i < *numHosts + 1; i++ {
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for i := 0; i < *numHosts+1; i++ {
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signatureKeys = append(signatureKeys, newSigKey())
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}
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signatureKeys = sortKeySetArray(signatureKeys)
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for i := 0; i < *keyTries - *numHosts - 1; i++ {
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signatureKeys[0] = newSigKey();
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for i := 0; i < *keyTries-*numHosts-1; i++ {
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signatureKeys[0] = newSigKey()
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signatureKeys = bubbleUpTo(signatureKeys, 0)
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}
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@ -112,11 +112,11 @@ func sortKeySetArray(sets []keySet) []keySet {
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}
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func bubbleUpTo(sets []keySet, num int) []keySet {
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for i := 0; i < len(sets) - num - 1; i++ {
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if isBetter(sets[i + 1].id, sets[i].id) {
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for i := 0; i < len(sets)-num-1; i++ {
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if isBetter(sets[i+1].id, sets[i].id) {
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var tmp = sets[i]
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sets[i] = sets[i + 1]
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sets[i + 1] = tmp
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sets[i] = sets[i+1]
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sets[i+1] = tmp
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} else {
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break
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}
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2
go.mod
2
go.mod
@ -2,10 +2,10 @@ module github.com/yggdrasil-network/yggdrasil-go
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require (
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github.com/docker/libcontainer v2.2.1+incompatible
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github.com/gologme/log v0.0.0-20181207131047-4e5d8ccb38e8
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github.com/hjson/hjson-go v0.0.0-20181010104306-a25ecf6bd222
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github.com/kardianos/minwinsvc v0.0.0-20151122163309-cad6b2b879b0
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github.com/mitchellh/mapstructure v1.1.2
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github.com/gologme/log v0.0.0-20181207131047-4e5d8ccb38e8
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github.com/songgao/packets v0.0.0-20160404182456-549a10cd4091
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github.com/yggdrasil-network/water v0.0.0-20180615095340-f732c88f34ae
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golang.org/x/crypto v0.0.0-20181203042331-505ab145d0a9
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4
go.sum
4
go.sum
@ -1,5 +1,7 @@
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github.com/docker/libcontainer v2.2.1+incompatible h1:++SbbkCw+X8vAd4j2gOCzZ2Nn7s2xFALTf7LZKmM1/0=
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github.com/docker/libcontainer v2.2.1+incompatible/go.mod h1:osvj61pYsqhNCMLGX31xr7klUBhHb/ZBuXS0o1Fvwbw=
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github.com/gologme/log v0.0.0-20181207131047-4e5d8ccb38e8 h1:WD8iJ37bRNwvETMfVTusVSAi0WdXTpfNVGY2aHycNKY=
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github.com/gologme/log v0.0.0-20181207131047-4e5d8ccb38e8/go.mod h1:gq31gQ8wEHkR+WekdWsqDuf8pXTUZA9BnnzTuPz1Y9U=
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github.com/hjson/hjson-go v0.0.0-20181010104306-a25ecf6bd222 h1:xmvkbxXDeN1ffWq8kvrhyqVYAO2aXuRBsbpxVTR+JyU=
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github.com/hjson/hjson-go v0.0.0-20181010104306-a25ecf6bd222/go.mod h1:qsetwF8NlsTsOTwZTApNlTCerV+b2GjYRRcIk4JMFio=
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github.com/kardianos/minwinsvc v0.0.0-20151122163309-cad6b2b879b0 h1:YnZmFjg0Nvk8851WTVWlqMC1ecJH07Ctz+Ezxx4u54g=
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@ -18,5 +20,3 @@ golang.org/x/sys v0.0.0-20181206074257-70b957f3b65e h1:njOxP/wVblhCLIUhjHXf6X+dz
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golang.org/x/sys v0.0.0-20181206074257-70b957f3b65e/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
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golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
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golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
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github.com/gologme/log v0.0.0-20181207131047-4e5d8ccb38e8 h1:WD8iJ37bRNwvETMfVTusVSAi0WdXTpfNVGY2aHycNKY=
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github.com/gologme/log v0.0.0-20181207131047-4e5d8ccb38e8/go.mod h1:gq31gQ8wEHkR+WekdWsqDuf8pXTUZA9BnnzTuPz1Y9U=
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@ -3,6 +3,7 @@ package util
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// These are misc. utility functions that didn't really fit anywhere else
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import "runtime"
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import "time"
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// A wrapper around runtime.Gosched() so it doesn't need to be imported elsewhere.
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func Yield() {
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@ -44,3 +45,14 @@ func PutBytes(bs []byte) {
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default:
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}
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}
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// This is a workaround to go's broken timer implementation
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func TimerStop(t *time.Timer) bool {
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if !t.Stop() {
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select {
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case <-t.C:
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default:
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}
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}
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return true
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}
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@ -2,147 +2,97 @@ package yggdrasil
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import (
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"errors"
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"fmt"
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"io"
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"sync"
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"sync/atomic"
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"time"
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"github.com/yggdrasil-network/yggdrasil-go/src/crypto"
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"github.com/yggdrasil-network/yggdrasil-go/src/util"
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)
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type awdl struct {
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core *Core
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link *link
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mutex sync.RWMutex // protects interfaces below
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interfaces map[string]*awdlInterface
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}
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type awdlInterface struct {
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awdl *awdl
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fromAWDL chan []byte
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toAWDL chan []byte
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shutdown chan bool
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peer *peer
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linkif *linkInterface
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rwc awdlReadWriteCloser
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peer *peer
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stream stream
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}
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func (l *awdl) init(c *Core) error {
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l.core = c
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l.mutex.Lock()
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l.interfaces = make(map[string]*awdlInterface)
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l.mutex.Unlock()
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type awdlReadWriteCloser struct {
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fromAWDL chan []byte
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toAWDL chan []byte
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}
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func (c awdlReadWriteCloser) Read(p []byte) (n int, err error) {
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if packet, ok := <-c.fromAWDL; ok {
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n = copy(p, packet)
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return n, nil
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}
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return 0, io.EOF
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}
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func (c awdlReadWriteCloser) Write(p []byte) (n int, err error) {
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var pc []byte
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pc = append(pc, p...)
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c.toAWDL <- pc
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return len(pc), nil
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}
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func (c awdlReadWriteCloser) Close() error {
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close(c.fromAWDL)
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close(c.toAWDL)
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return nil
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}
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func (a *awdl) init(l *link) error {
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a.link = l
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a.mutex.Lock()
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a.interfaces = make(map[string]*awdlInterface)
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a.mutex.Unlock()
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return nil
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}
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func (l *awdl) create(fromAWDL chan []byte, toAWDL chan []byte /*boxPubKey *crypto.BoxPubKey, sigPubKey *crypto.SigPubKey*/, name string) (*awdlInterface, error) {
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func (a *awdl) create(name, local, remote string, incoming bool) (*awdlInterface, error) {
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rwc := awdlReadWriteCloser{
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fromAWDL: make(chan []byte, 1),
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toAWDL: make(chan []byte, 1),
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}
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s := stream{}
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s.init(rwc)
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linkif, err := a.link.create(&s, name, "awdl", local, remote, incoming, true)
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if err != nil {
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return nil, err
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}
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intf := awdlInterface{
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awdl: l,
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fromAWDL: fromAWDL,
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toAWDL: toAWDL,
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shutdown: make(chan bool),
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linkif: linkif,
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rwc: rwc,
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}
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l.mutex.Lock()
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l.interfaces[name] = &intf
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l.mutex.Unlock()
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myLinkPub, myLinkPriv := crypto.NewBoxKeys()
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meta := version_getBaseMetadata()
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meta.box = l.core.boxPub
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meta.sig = l.core.sigPub
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meta.link = *myLinkPub
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metaBytes := meta.encode()
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l.core.log.Traceln("toAWDL <- metaBytes")
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toAWDL <- metaBytes
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l.core.log.Traceln("metaBytes = <-fromAWDL")
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metaBytes = <-fromAWDL
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l.core.log.Traceln("version_metadata{}")
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meta = version_metadata{}
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if !meta.decode(metaBytes) || !meta.check() {
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return nil, errors.New("Metadata decode failure")
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}
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l.core.log.Traceln("version_getBaseMetadata{}")
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base := version_getBaseMetadata()
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if meta.ver > base.ver || meta.ver == base.ver && meta.minorVer > base.minorVer {
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return nil, errors.New("Failed to connect to node: " + name + " version: " + fmt.Sprintf("%d.%d", meta.ver, meta.minorVer))
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}
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l.core.log.Traceln("crypto.GetSharedKey")
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shared := crypto.GetSharedKey(myLinkPriv, &meta.link)
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//shared := crypto.GetSharedKey(&l.core.boxPriv, boxPubKey)
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l.core.log.Traceln("l.core.peers.newPeer")
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intf.peer = l.core.peers.newPeer(&meta.box, &meta.sig, shared, name)
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if intf.peer != nil {
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intf.peer.linkOut = make(chan []byte, 1) // protocol traffic
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intf.peer.out = func(msg []byte) {
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defer func() { recover() }()
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intf.toAWDL <- msg
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} // called by peer.sendPacket()
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l.core.switchTable.idleIn <- intf.peer.port // notify switch that we're idle
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intf.peer.close = func() {
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close(intf.fromAWDL)
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close(intf.toAWDL)
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}
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go intf.handler()
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go intf.peer.linkLoop()
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return &intf, nil
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}
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delete(l.interfaces, name)
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return nil, errors.New("l.core.peers.newPeer failed")
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a.mutex.Lock()
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a.interfaces[name] = &intf
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a.mutex.Unlock()
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go intf.linkif.handler()
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return &intf, nil
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}
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func (l *awdl) getInterface(identity string) *awdlInterface {
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l.mutex.RLock()
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defer l.mutex.RUnlock()
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if intf, ok := l.interfaces[identity]; ok {
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func (a *awdl) getInterface(identity string) *awdlInterface {
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a.mutex.RLock()
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defer a.mutex.RUnlock()
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if intf, ok := a.interfaces[identity]; ok {
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return intf
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}
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return nil
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}
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func (l *awdl) shutdown(identity string) error {
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if intf, ok := l.interfaces[identity]; ok {
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intf.shutdown <- true
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l.core.peers.removePeer(intf.peer.port)
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l.mutex.Lock()
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delete(l.interfaces, identity)
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l.mutex.Unlock()
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func (a *awdl) shutdown(identity string) error {
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if intf, ok := a.interfaces[identity]; ok {
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close(intf.linkif.closed)
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intf.rwc.Close()
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a.mutex.Lock()
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delete(a.interfaces, identity)
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a.mutex.Unlock()
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return nil
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} else {
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return errors.New(fmt.Sprintf("Interface '%s' doesn't exist or already shutdown", identity))
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}
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}
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func (ai *awdlInterface) handler() {
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send := func(msg []byte) {
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ai.toAWDL <- msg
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atomic.AddUint64(&ai.peer.bytesSent, uint64(len(msg)))
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util.PutBytes(msg)
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}
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for {
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timerInterval := tcp_ping_interval
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timer := time.NewTimer(timerInterval)
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defer timer.Stop()
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select {
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case p := <-ai.peer.linkOut:
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send(p)
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continue
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default:
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}
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timer.Stop()
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select {
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case <-timer.C:
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default:
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}
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timer.Reset(timerInterval)
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select {
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case _ = <-timer.C:
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send([]byte{})
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case p := <-ai.peer.linkOut:
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send(p)
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continue
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case r := <-ai.fromAWDL:
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ai.peer.handlePacket(r)
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ai.awdl.core.switchTable.idleIn <- ai.peer.port
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case <-ai.shutdown:
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return
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}
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}
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return errors.New("Interface not found or already closed")
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}
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|
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@ -45,7 +45,7 @@ type Core struct {
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searches searches
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multicast multicast
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tcp tcpInterface
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awdl awdl
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link link
|
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log *log.Logger
|
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}
|
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|
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@ -199,8 +199,8 @@ func (c *Core) Start(nc *config.NodeConfig, log *log.Logger) error {
|
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return err
|
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}
|
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|
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if err := c.awdl.init(c); err != nil {
|
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c.log.Errorln("Failed to start AWDL interface")
|
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if err := c.link.init(c); err != nil {
|
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c.log.Errorln("Failed to start link interfaces")
|
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return err
|
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}
|
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|
||||
|
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@ -97,9 +97,7 @@ func (c *Core) DEBUG_getPeers() *peers {
|
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}
|
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|
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func (ps *peers) DEBUG_newPeer(box crypto.BoxPubKey, sig crypto.SigPubKey, link crypto.BoxSharedKey) *peer {
|
||||
//in <-chan []byte,
|
||||
//out chan<- []byte) *peer {
|
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return ps.newPeer(&box, &sig, &link, "(simulator)") //, in, out)
|
||||
return ps.newPeer(&box, &sig, &link, "(simulator)", nil)
|
||||
}
|
||||
|
||||
/*
|
||||
|
||||
311
src/yggdrasil/link.go
Normal file
311
src/yggdrasil/link.go
Normal file
@ -0,0 +1,311 @@
|
||||
package yggdrasil
|
||||
|
||||
import (
|
||||
"encoding/hex"
|
||||
"errors"
|
||||
"fmt"
|
||||
"net"
|
||||
"strings"
|
||||
"sync"
|
||||
//"sync/atomic"
|
||||
"time"
|
||||
|
||||
"github.com/yggdrasil-network/yggdrasil-go/src/address"
|
||||
"github.com/yggdrasil-network/yggdrasil-go/src/crypto"
|
||||
"github.com/yggdrasil-network/yggdrasil-go/src/util"
|
||||
)
|
||||
|
||||
type link struct {
|
||||
core *Core
|
||||
mutex sync.RWMutex // protects interfaces below
|
||||
interfaces map[linkInfo]*linkInterface
|
||||
awdl awdl // AWDL interface support
|
||||
// TODO timeout (to remove from switch), read from config.ReadTimeout
|
||||
}
|
||||
|
||||
type linkInfo struct {
|
||||
box crypto.BoxPubKey // Their encryption key
|
||||
sig crypto.SigPubKey // Their signing key
|
||||
linkType string // Type of link, e.g. TCP, AWDL
|
||||
local string // Local name or address
|
||||
remote string // Remote name or address
|
||||
}
|
||||
|
||||
type linkInterfaceMsgIO interface {
|
||||
readMsg() ([]byte, error)
|
||||
writeMsg([]byte) (int, error)
|
||||
close() error
|
||||
// These are temporary workarounds to stream semantics
|
||||
_sendMetaBytes([]byte) error
|
||||
_recvMetaBytes() ([]byte, error)
|
||||
}
|
||||
|
||||
type linkInterface struct {
|
||||
name string
|
||||
link *link
|
||||
peer *peer
|
||||
msgIO linkInterfaceMsgIO
|
||||
info linkInfo
|
||||
incoming bool
|
||||
force bool
|
||||
closed chan struct{}
|
||||
}
|
||||
|
||||
func (l *link) init(c *Core) error {
|
||||
l.core = c
|
||||
l.mutex.Lock()
|
||||
l.interfaces = make(map[linkInfo]*linkInterface)
|
||||
l.mutex.Unlock()
|
||||
|
||||
if err := l.awdl.init(l); err != nil {
|
||||
l.core.log.Errorln("Failed to start AWDL interface")
|
||||
return err
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
func (l *link) create(msgIO linkInterfaceMsgIO, name, linkType, local, remote string, incoming, force bool) (*linkInterface, error) {
|
||||
// Technically anything unique would work for names, but lets pick something human readable, just for debugging
|
||||
intf := linkInterface{
|
||||
name: name,
|
||||
link: l,
|
||||
msgIO: msgIO,
|
||||
info: linkInfo{
|
||||
linkType: linkType,
|
||||
local: local,
|
||||
remote: remote,
|
||||
},
|
||||
incoming: incoming,
|
||||
force: force,
|
||||
}
|
||||
return &intf, nil
|
||||
}
|
||||
|
||||
func (intf *linkInterface) handler() error {
|
||||
// TODO split some of this into shorter functions, so it's easier to read, and for the FIXME duplicate peer issue mentioned later
|
||||
myLinkPub, myLinkPriv := crypto.NewBoxKeys()
|
||||
meta := version_getBaseMetadata()
|
||||
meta.box = intf.link.core.boxPub
|
||||
meta.sig = intf.link.core.sigPub
|
||||
meta.link = *myLinkPub
|
||||
metaBytes := meta.encode()
|
||||
// TODO timeouts on send/recv (goroutine for send/recv, channel select w/ timer)
|
||||
err := intf.msgIO._sendMetaBytes(metaBytes)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
metaBytes, err = intf.msgIO._recvMetaBytes()
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
meta = version_metadata{}
|
||||
if !meta.decode(metaBytes) || !meta.check() {
|
||||
return errors.New("failed to decode metadata")
|
||||
}
|
||||
base := version_getBaseMetadata()
|
||||
if meta.ver > base.ver || meta.ver == base.ver && meta.minorVer > base.minorVer {
|
||||
intf.link.core.log.Errorln("Failed to connect to node: " + intf.name + " version: " + fmt.Sprintf("%d.%d", meta.ver, meta.minorVer))
|
||||
return errors.New("failed to connect: wrong version")
|
||||
}
|
||||
// Check if we're authorized to connect to this key / IP
|
||||
if !intf.force && !intf.link.core.peers.isAllowedEncryptionPublicKey(&meta.box) {
|
||||
intf.link.core.log.Debugf("%s connection to %s forbidden: AllowedEncryptionPublicKeys does not contain key %s",
|
||||
strings.ToUpper(intf.info.linkType), intf.info.remote, hex.EncodeToString(meta.box[:]))
|
||||
intf.msgIO.close()
|
||||
return nil
|
||||
}
|
||||
// Check if we already have a link to this node
|
||||
intf.info.box = meta.box
|
||||
intf.info.sig = meta.sig
|
||||
intf.link.mutex.Lock()
|
||||
if oldIntf, isIn := intf.link.interfaces[intf.info]; isIn {
|
||||
intf.link.mutex.Unlock()
|
||||
// FIXME we should really return an error and let the caller block instead
|
||||
// That lets them do things like close connections on its own, avoid printing a connection message in the first place, etc.
|
||||
intf.link.core.log.Debugln("DEBUG: found existing interface for", intf.name)
|
||||
intf.msgIO.close()
|
||||
<-oldIntf.closed
|
||||
return nil
|
||||
} else {
|
||||
intf.closed = make(chan struct{})
|
||||
intf.link.interfaces[intf.info] = intf
|
||||
defer func() {
|
||||
intf.link.mutex.Lock()
|
||||
delete(intf.link.interfaces, intf.info)
|
||||
intf.link.mutex.Unlock()
|
||||
close(intf.closed)
|
||||
}()
|
||||
intf.link.core.log.Debugln("DEBUG: registered interface for", intf.name)
|
||||
}
|
||||
intf.link.mutex.Unlock()
|
||||
// Create peer
|
||||
shared := crypto.GetSharedKey(myLinkPriv, &meta.link)
|
||||
intf.peer = intf.link.core.peers.newPeer(&meta.box, &meta.sig, shared, intf.name, func() { intf.msgIO.close() })
|
||||
if intf.peer == nil {
|
||||
return errors.New("failed to create peer")
|
||||
}
|
||||
defer func() {
|
||||
// More cleanup can go here
|
||||
intf.link.core.peers.removePeer(intf.peer.port)
|
||||
}()
|
||||
// Finish setting up the peer struct
|
||||
out := make(chan []byte, 1)
|
||||
defer close(out)
|
||||
intf.peer.out = func(msg []byte) {
|
||||
defer func() { recover() }()
|
||||
out <- msg
|
||||
}
|
||||
intf.peer.linkOut = make(chan []byte, 1)
|
||||
themAddr := address.AddrForNodeID(crypto.GetNodeID(&intf.info.box))
|
||||
themAddrString := net.IP(themAddr[:]).String()
|
||||
themString := fmt.Sprintf("%s@%s", themAddrString, intf.info.remote)
|
||||
intf.link.core.log.Infof("Connected %s: %s, source %s",
|
||||
strings.ToUpper(intf.info.linkType), themString, intf.info.local)
|
||||
defer intf.link.core.log.Infof("Disconnected %s: %s, source %s",
|
||||
strings.ToUpper(intf.info.linkType), themString, intf.info.local)
|
||||
// Start the link loop
|
||||
go intf.peer.linkLoop()
|
||||
// Start the writer
|
||||
signalReady := make(chan struct{}, 1)
|
||||
signalSent := make(chan bool, 1)
|
||||
sendAck := make(chan struct{}, 1)
|
||||
go func() {
|
||||
defer close(signalReady)
|
||||
defer close(signalSent)
|
||||
interval := 4 * time.Second
|
||||
tcpTimer := time.NewTimer(interval) // used for backwards compat with old tcp
|
||||
defer util.TimerStop(tcpTimer)
|
||||
send := func(bs []byte) {
|
||||
intf.msgIO.writeMsg(bs)
|
||||
select {
|
||||
case signalSent <- len(bs) > 0:
|
||||
default:
|
||||
}
|
||||
}
|
||||
for {
|
||||
// First try to send any link protocol traffic
|
||||
select {
|
||||
case msg := <-intf.peer.linkOut:
|
||||
send(msg)
|
||||
continue
|
||||
default:
|
||||
}
|
||||
// No protocol traffic to send, so reset the timer
|
||||
util.TimerStop(tcpTimer)
|
||||
tcpTimer.Reset(interval)
|
||||
// Now block until something is ready or the timer triggers keepalive traffic
|
||||
select {
|
||||
case <-tcpTimer.C:
|
||||
intf.link.core.log.Debugf("Sending (legacy) keep-alive to %s: %s, source %s",
|
||||
strings.ToUpper(intf.info.linkType), themString, intf.info.local)
|
||||
send(nil)
|
||||
case <-sendAck:
|
||||
intf.link.core.log.Debugf("Sending ack to %s: %s, source %s",
|
||||
strings.ToUpper(intf.info.linkType), themString, intf.info.local)
|
||||
send(nil)
|
||||
case msg := <-intf.peer.linkOut:
|
||||
intf.msgIO.writeMsg(msg)
|
||||
case msg, ok := <-out:
|
||||
if !ok {
|
||||
return
|
||||
}
|
||||
send(msg)
|
||||
util.PutBytes(msg)
|
||||
select {
|
||||
case signalReady <- struct{}{}:
|
||||
default:
|
||||
}
|
||||
}
|
||||
}
|
||||
}()
|
||||
//intf.link.core.switchTable.idleIn <- intf.peer.port // notify switch that we're idle
|
||||
// Used to enable/disable activity in the switch
|
||||
signalAlive := make(chan bool, 1) // True = real packet, false = keep-alive
|
||||
defer close(signalAlive)
|
||||
go func() {
|
||||
var isAlive bool
|
||||
var isReady bool
|
||||
var sendTimerRunning bool
|
||||
var recvTimerRunning bool
|
||||
recvTime := 6 * time.Second // TODO set to ReadTimeout from the config, reset if it gets changed
|
||||
sendTime := time.Second
|
||||
sendTimer := time.NewTimer(sendTime)
|
||||
defer util.TimerStop(sendTimer)
|
||||
recvTimer := time.NewTimer(recvTime)
|
||||
defer util.TimerStop(recvTimer)
|
||||
for {
|
||||
select {
|
||||
case gotMsg, ok := <-signalAlive:
|
||||
if !ok {
|
||||
return
|
||||
}
|
||||
if !isAlive {
|
||||
isAlive = true
|
||||
if !isReady {
|
||||
// (Re-)enable in the switch
|
||||
isReady = true
|
||||
intf.link.core.switchTable.idleIn <- intf.peer.port
|
||||
}
|
||||
}
|
||||
if gotMsg && !sendTimerRunning {
|
||||
// We got a message
|
||||
// Start a timer, if it expires then send a 0-sized ack to let them know we're alive
|
||||
util.TimerStop(sendTimer)
|
||||
sendTimer.Reset(sendTime)
|
||||
sendTimerRunning = true
|
||||
}
|
||||
case sentMsg, ok := <-signalSent:
|
||||
// Stop any running ack timer
|
||||
if !ok {
|
||||
return
|
||||
}
|
||||
util.TimerStop(sendTimer)
|
||||
sendTimerRunning = false
|
||||
if sentMsg && !recvTimerRunning {
|
||||
// We sent a message
|
||||
// Start a timer, if it expires and we haven't gotten any return traffic (including a 0-sized ack), then assume there's a problem
|
||||
util.TimerStop(recvTimer)
|
||||
recvTimer.Reset(recvTime)
|
||||
recvTimerRunning = true
|
||||
}
|
||||
case _, ok := <-signalReady:
|
||||
if !ok {
|
||||
return
|
||||
}
|
||||
if !isAlive || !isReady {
|
||||
// Disable in the switch
|
||||
isReady = false
|
||||
} else {
|
||||
// Keep enabled in the switch
|
||||
intf.link.core.switchTable.idleIn <- intf.peer.port
|
||||
}
|
||||
case <-sendTimer.C:
|
||||
// We haven't sent anything, so signal a send of a 0 packet to let them know we're alive
|
||||
select {
|
||||
case sendAck <- struct{}{}:
|
||||
default:
|
||||
}
|
||||
case <-recvTimer.C:
|
||||
// We haven't received anything, so assume there's a problem and don't return this node to the switch until they start responding
|
||||
isAlive = false
|
||||
}
|
||||
}
|
||||
}()
|
||||
// Run reader loop
|
||||
for {
|
||||
msg, err := intf.msgIO.readMsg()
|
||||
if len(msg) > 0 {
|
||||
intf.peer.handlePacket(msg)
|
||||
}
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
select {
|
||||
case signalAlive <- len(msg) > 0:
|
||||
default:
|
||||
}
|
||||
}
|
||||
////////////////////////////////////////////////////////////////////////////////
|
||||
return nil
|
||||
}
|
||||
@ -5,11 +5,11 @@ package yggdrasil
|
||||
import (
|
||||
"encoding/hex"
|
||||
"encoding/json"
|
||||
"log"
|
||||
"os"
|
||||
"regexp"
|
||||
"time"
|
||||
|
||||
"github.com/gologme/log"
|
||||
|
||||
hjson "github.com/hjson/hjson-go"
|
||||
"github.com/mitchellh/mapstructure"
|
||||
"github.com/yggdrasil-network/yggdrasil-go/src/config"
|
||||
@ -52,10 +52,6 @@ func (c *Core) StartAutoconfigure() error {
|
||||
if hostname, err := os.Hostname(); err == nil {
|
||||
nc.NodeInfo = map[string]interface{}{"name": hostname}
|
||||
}
|
||||
ifceExpr, err := regexp.Compile(".*")
|
||||
if err == nil {
|
||||
c.ifceExpr = append(c.ifceExpr, ifceExpr)
|
||||
}
|
||||
if err := c.Start(nc, logger); err != nil {
|
||||
return err
|
||||
}
|
||||
@ -77,13 +73,6 @@ func (c *Core) StartJSON(configjson []byte) error {
|
||||
return err
|
||||
}
|
||||
nc.IfName = "dummy"
|
||||
for _, ll := range nc.MulticastInterfaces {
|
||||
ifceExpr, err := regexp.Compile(ll)
|
||||
if err != nil {
|
||||
panic(err)
|
||||
}
|
||||
c.AddMulticastInterfaceExpr(ifceExpr)
|
||||
}
|
||||
if err := c.Start(nc, logger); err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
@ -29,39 +29,33 @@ func (nsl MobileLogger) Write(p []byte) (n int, err error) {
|
||||
return len(p), nil
|
||||
}
|
||||
|
||||
func (c *Core) AWDLCreateInterface(name string) error {
|
||||
fromAWDL := make(chan []byte, 32)
|
||||
toAWDL := make(chan []byte, 32)
|
||||
|
||||
if intf, err := c.awdl.create(fromAWDL, toAWDL, name); err == nil {
|
||||
if intf != nil {
|
||||
c.log.Println(err)
|
||||
return err
|
||||
} else {
|
||||
c.log.Println("c.awdl.create didn't return an interface")
|
||||
return errors.New("c.awdl.create didn't return an interface")
|
||||
}
|
||||
} else {
|
||||
c.log.Println(err)
|
||||
func (c *Core) AWDLCreateInterface(name, local, remote string, incoming bool) error {
|
||||
if intf, err := c.link.awdl.create(name, local, remote, incoming); err != nil || intf == nil {
|
||||
c.log.Println("c.link.awdl.create:", err)
|
||||
return err
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func (c *Core) AWDLShutdownInterface(name string) error {
|
||||
return c.awdl.shutdown(name)
|
||||
return c.link.awdl.shutdown(name)
|
||||
}
|
||||
|
||||
func (c *Core) AWDLRecvPacket(identity string) ([]byte, error) {
|
||||
if intf := c.awdl.getInterface(identity); intf != nil {
|
||||
return <-intf.toAWDL, nil
|
||||
if intf := c.link.awdl.getInterface(identity); intf != nil {
|
||||
read, ok := <-intf.rwc.toAWDL
|
||||
if !ok {
|
||||
return nil, errors.New("AWDLRecvPacket: channel closed")
|
||||
}
|
||||
return read, nil
|
||||
}
|
||||
return nil, errors.New("AWDLRecvPacket identity not known: " + identity)
|
||||
}
|
||||
|
||||
func (c *Core) AWDLSendPacket(identity string, buf []byte) error {
|
||||
packet := append(util.GetBytes(), buf[:]...)
|
||||
if intf := c.awdl.getInterface(identity); intf != nil {
|
||||
intf.fromAWDL <- packet
|
||||
if intf := c.link.awdl.getInterface(identity); intf != nil {
|
||||
intf.rwc.fromAWDL <- packet
|
||||
return nil
|
||||
}
|
||||
return errors.New("AWDLSendPacket identity not known: " + identity)
|
||||
|
||||
@ -113,7 +113,7 @@ type peer struct {
|
||||
}
|
||||
|
||||
// Creates a new peer with the specified box, sig, and linkShared keys, using the lowest unoccupied port number.
|
||||
func (ps *peers) newPeer(box *crypto.BoxPubKey, sig *crypto.SigPubKey, linkShared *crypto.BoxSharedKey, endpoint string) *peer {
|
||||
func (ps *peers) newPeer(box *crypto.BoxPubKey, sig *crypto.SigPubKey, linkShared *crypto.BoxSharedKey, endpoint string, closer func()) *peer {
|
||||
now := time.Now()
|
||||
p := peer{box: *box,
|
||||
sig: *sig,
|
||||
@ -123,6 +123,7 @@ func (ps *peers) newPeer(box *crypto.BoxPubKey, sig *crypto.SigPubKey, linkShare
|
||||
firstSeen: now,
|
||||
doSend: make(chan struct{}, 1),
|
||||
dinfo: make(chan *dhtInfo, 1),
|
||||
close: closer,
|
||||
core: ps.core}
|
||||
ps.mutex.Lock()
|
||||
defer ps.mutex.Unlock()
|
||||
@ -250,6 +251,7 @@ func (p *peer) handleTraffic(packet []byte, pTypeLen int) {
|
||||
func (p *peer) sendPacket(packet []byte) {
|
||||
// Is there ever a case where something more complicated is needed?
|
||||
// What if p.out blocks?
|
||||
atomic.AddUint64(&p.bytesSent, uint64(len(packet)))
|
||||
p.out(packet)
|
||||
}
|
||||
|
||||
|
||||
@ -67,7 +67,7 @@ func (r *router) init(core *Core) {
|
||||
r.addr = *address.AddrForNodeID(&r.core.dht.nodeID)
|
||||
r.subnet = *address.SubnetForNodeID(&r.core.dht.nodeID)
|
||||
in := make(chan []byte, 32) // TODO something better than this...
|
||||
p := r.core.peers.newPeer(&r.core.boxPub, &r.core.sigPub, &crypto.BoxSharedKey{}, "(self)")
|
||||
p := r.core.peers.newPeer(&r.core.boxPub, &r.core.sigPub, &crypto.BoxSharedKey{}, "(self)", nil)
|
||||
p.out = func(packet []byte) {
|
||||
// This is to make very sure it never blocks
|
||||
select {
|
||||
|
||||
141
src/yggdrasil/stream.go
Normal file
141
src/yggdrasil/stream.go
Normal file
@ -0,0 +1,141 @@
|
||||
package yggdrasil
|
||||
|
||||
import (
|
||||
"errors"
|
||||
"fmt"
|
||||
"io"
|
||||
|
||||
"github.com/yggdrasil-network/yggdrasil-go/src/util"
|
||||
)
|
||||
|
||||
// Test that this matches the interface we expect
|
||||
var _ = linkInterfaceMsgIO(&stream{})
|
||||
|
||||
type stream struct {
|
||||
rwc io.ReadWriteCloser
|
||||
inputBuffer []byte // Incoming packet stream
|
||||
}
|
||||
|
||||
func (s *stream) close() error {
|
||||
return s.rwc.Close()
|
||||
}
|
||||
|
||||
const streamMsgSize = 2048 + 65535
|
||||
|
||||
var streamMsg = [...]byte{0xde, 0xad, 0xb1, 0x75} // "dead bits"
|
||||
|
||||
func (s *stream) init(rwc io.ReadWriteCloser) {
|
||||
// TODO have this also do the metadata handshake and create the peer struct
|
||||
s.rwc = rwc
|
||||
// TODO call something to do the metadata exchange
|
||||
}
|
||||
|
||||
// writeMsg writes a message with stream padding, and is *not* thread safe.
|
||||
func (s *stream) writeMsg(bs []byte) (int, error) {
|
||||
buf := util.GetBytes()
|
||||
defer util.PutBytes(buf)
|
||||
buf = append(buf, streamMsg[:]...)
|
||||
buf = append(buf, wire_encode_uint64(uint64(len(bs)))...)
|
||||
padLen := len(buf)
|
||||
buf = append(buf, bs...)
|
||||
var bn int
|
||||
for bn < len(buf) {
|
||||
n, err := s.rwc.Write(buf[bn:])
|
||||
bn += n
|
||||
if err != nil {
|
||||
l := bn - padLen
|
||||
if l < 0 {
|
||||
l = 0
|
||||
}
|
||||
return l, err
|
||||
}
|
||||
}
|
||||
return len(bs), nil
|
||||
}
|
||||
|
||||
// readMsg reads a message from the stream, accounting for stream padding, and is *not* thread safe.
|
||||
func (s *stream) readMsg() ([]byte, error) {
|
||||
for {
|
||||
buf := s.inputBuffer
|
||||
msg, ok, err := stream_chopMsg(&buf)
|
||||
switch {
|
||||
case err != nil:
|
||||
// Something in the stream format is corrupt
|
||||
return nil, fmt.Errorf("message error: %v", err)
|
||||
case ok:
|
||||
// Copy the packet into bs, shift the buffer, and return
|
||||
msg = append(util.GetBytes(), msg...)
|
||||
s.inputBuffer = append(s.inputBuffer[:0], buf...)
|
||||
return msg, nil
|
||||
default:
|
||||
// Wait for the underlying reader to return enough info for us to proceed
|
||||
frag := make([]byte, 2*streamMsgSize)
|
||||
n, err := s.rwc.Read(frag)
|
||||
if n > 0 {
|
||||
s.inputBuffer = append(s.inputBuffer, frag[:n]...)
|
||||
} else if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Writes metadata bytes without stream padding, meant to be temporary
|
||||
func (s *stream) _sendMetaBytes(metaBytes []byte) error {
|
||||
var written int
|
||||
for written < len(metaBytes) {
|
||||
n, err := s.rwc.Write(metaBytes)
|
||||
written += n
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
// Reads metadata bytes without stream padding, meant to be temporary
|
||||
func (s *stream) _recvMetaBytes() ([]byte, error) {
|
||||
var meta version_metadata
|
||||
frag := meta.encode()
|
||||
metaBytes := make([]byte, 0, len(frag))
|
||||
for len(metaBytes) < len(frag) {
|
||||
n, err := s.rwc.Read(frag)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
metaBytes = append(metaBytes, frag[:n]...)
|
||||
}
|
||||
return metaBytes, nil
|
||||
}
|
||||
|
||||
// This takes a pointer to a slice as an argument. It checks if there's a
|
||||
// complete message and, if so, slices out those parts and returns the message,
|
||||
// true, and nil. If there's no error, but also no complete message, it returns
|
||||
// nil, false, and nil. If there's an error, it returns nil, false, and the
|
||||
// error, which the reader then handles (currently, by returning from the
|
||||
// reader, which causes the connection to close).
|
||||
func stream_chopMsg(bs *[]byte) ([]byte, bool, error) {
|
||||
// Returns msg, ok, err
|
||||
if len(*bs) < len(streamMsg) {
|
||||
return nil, false, nil
|
||||
}
|
||||
for idx := range streamMsg {
|
||||
if (*bs)[idx] != streamMsg[idx] {
|
||||
return nil, false, errors.New("bad message")
|
||||
}
|
||||
}
|
||||
msgLen, msgLenLen := wire_decode_uint64((*bs)[len(streamMsg):])
|
||||
if msgLen > streamMsgSize {
|
||||
return nil, false, errors.New("oversized message")
|
||||
}
|
||||
msgBegin := len(streamMsg) + msgLenLen
|
||||
msgEnd := msgBegin + int(msgLen)
|
||||
if msgLenLen == 0 || len(*bs) < msgEnd {
|
||||
// We don't have the full message
|
||||
// Need to buffer this and wait for the rest to come in
|
||||
return nil, false, nil
|
||||
}
|
||||
msg := (*bs)[msgBegin:msgEnd]
|
||||
(*bs) = (*bs)[msgEnd:]
|
||||
return msg, true, nil
|
||||
}
|
||||
@ -281,6 +281,7 @@ func (t *switchTable) cleanPeers() {
|
||||
if now.Sub(peer.time) > switch_timeout+switch_throttle {
|
||||
// Longer than switch_timeout to make sure we don't remove a working peer because the root stopped responding.
|
||||
delete(t.data.peers, port)
|
||||
go t.core.peers.removePeer(port) // TODO figure out if it's safe to do this without a goroutine, or make it safe
|
||||
}
|
||||
}
|
||||
if _, isIn := t.data.peers[t.parent]; !isIn {
|
||||
|
||||
@ -16,34 +16,28 @@ package yggdrasil
|
||||
|
||||
import (
|
||||
"context"
|
||||
"errors"
|
||||
"fmt"
|
||||
"io"
|
||||
"math/rand"
|
||||
"net"
|
||||
"sync"
|
||||
"sync/atomic"
|
||||
"time"
|
||||
|
||||
"golang.org/x/net/proxy"
|
||||
|
||||
"github.com/yggdrasil-network/yggdrasil-go/src/address"
|
||||
"github.com/yggdrasil-network/yggdrasil-go/src/crypto"
|
||||
"github.com/yggdrasil-network/yggdrasil-go/src/util"
|
||||
)
|
||||
|
||||
const tcp_msgSize = 2048 + 65535 // TODO figure out what makes sense
|
||||
const default_tcp_timeout = 6 * time.Second
|
||||
const tcp_ping_interval = (default_tcp_timeout * 2 / 3)
|
||||
const default_timeout = 6 * time.Second
|
||||
const tcp_ping_interval = (default_timeout * 2 / 3)
|
||||
|
||||
// The TCP listener and information about active TCP connections, to avoid duplication.
|
||||
type tcpInterface struct {
|
||||
core *Core
|
||||
reconfigure chan chan error
|
||||
serv net.Listener
|
||||
serv_stop chan bool
|
||||
tcp_timeout time.Duration
|
||||
tcp_addr string
|
||||
stop chan bool
|
||||
timeout time.Duration
|
||||
addr string
|
||||
mutex sync.Mutex // Protecting the below
|
||||
calls map[string]struct{}
|
||||
conns map[tcpInfo](chan struct{})
|
||||
@ -86,7 +80,7 @@ func (iface *tcpInterface) connectSOCKS(socksaddr, peeraddr string) {
|
||||
// Initializes the struct.
|
||||
func (iface *tcpInterface) init(core *Core) (err error) {
|
||||
iface.core = core
|
||||
iface.serv_stop = make(chan bool, 1)
|
||||
iface.stop = make(chan bool, 1)
|
||||
iface.reconfigure = make(chan chan error, 1)
|
||||
go func() {
|
||||
for {
|
||||
@ -95,7 +89,7 @@ func (iface *tcpInterface) init(core *Core) (err error) {
|
||||
updated := iface.core.config.Listen != iface.core.configOld.Listen
|
||||
iface.core.configMutex.RUnlock()
|
||||
if updated {
|
||||
iface.serv_stop <- true
|
||||
iface.stop <- true
|
||||
iface.serv.Close()
|
||||
e <- iface.listen()
|
||||
} else {
|
||||
@ -111,19 +105,19 @@ func (iface *tcpInterface) listen() error {
|
||||
var err error
|
||||
|
||||
iface.core.configMutex.RLock()
|
||||
iface.tcp_addr = iface.core.config.Listen
|
||||
iface.tcp_timeout = time.Duration(iface.core.config.ReadTimeout) * time.Millisecond
|
||||
iface.addr = iface.core.config.Listen
|
||||
iface.timeout = time.Duration(iface.core.config.ReadTimeout) * time.Millisecond
|
||||
iface.core.configMutex.RUnlock()
|
||||
|
||||
if iface.tcp_timeout >= 0 && iface.tcp_timeout < default_tcp_timeout {
|
||||
iface.tcp_timeout = default_tcp_timeout
|
||||
if iface.timeout >= 0 && iface.timeout < default_timeout {
|
||||
iface.timeout = default_timeout
|
||||
}
|
||||
|
||||
ctx := context.Background()
|
||||
lc := net.ListenConfig{
|
||||
Control: iface.tcpContext,
|
||||
}
|
||||
iface.serv, err = lc.Listen(ctx, "tcp", iface.tcp_addr)
|
||||
iface.serv, err = lc.Listen(ctx, "tcp", iface.addr)
|
||||
if err == nil {
|
||||
iface.mutex.Lock()
|
||||
iface.calls = make(map[string]struct{})
|
||||
@ -147,7 +141,7 @@ func (iface *tcpInterface) listener() {
|
||||
return
|
||||
}
|
||||
select {
|
||||
case <-iface.serv_stop:
|
||||
case <-iface.stop:
|
||||
iface.core.log.Errorln("Stopping listener")
|
||||
return
|
||||
default:
|
||||
@ -186,7 +180,7 @@ func (iface *tcpInterface) call(saddr string, socksaddr *string, sintf string) {
|
||||
if sintf != "" {
|
||||
callname = fmt.Sprintf("%s/%s", saddr, sintf)
|
||||
}
|
||||
if iface.isAlreadyCalling(saddr) {
|
||||
if iface.isAlreadyCalling(callname) {
|
||||
return
|
||||
}
|
||||
iface.mutex.Lock()
|
||||
@ -194,7 +188,7 @@ func (iface *tcpInterface) call(saddr string, socksaddr *string, sintf string) {
|
||||
iface.mutex.Unlock()
|
||||
defer func() {
|
||||
// Block new calls for a little while, to mitigate livelock scenarios
|
||||
time.Sleep(default_tcp_timeout)
|
||||
time.Sleep(default_timeout)
|
||||
time.Sleep(time.Duration(rand.Intn(1000)) * time.Millisecond)
|
||||
iface.mutex.Lock()
|
||||
delete(iface.calls, callname)
|
||||
@ -283,245 +277,21 @@ func (iface *tcpInterface) call(saddr string, socksaddr *string, sintf string) {
|
||||
}()
|
||||
}
|
||||
|
||||
// This exchanges/checks connection metadata, sets up the peer struct, sets up the writer goroutine, and then runs the reader within the current goroutine.
|
||||
// It defers a bunch of cleanup stuff to tear down all of these things when the reader exists (e.g. due to a closed connection or a timeout).
|
||||
func (iface *tcpInterface) handler(sock net.Conn, incoming bool) {
|
||||
defer sock.Close()
|
||||
iface.setExtraOptions(sock)
|
||||
// Get our keys
|
||||
myLinkPub, myLinkPriv := crypto.NewBoxKeys() // ephemeral link keys
|
||||
meta := version_getBaseMetadata()
|
||||
meta.box = iface.core.boxPub
|
||||
meta.sig = iface.core.sigPub
|
||||
meta.link = *myLinkPub
|
||||
metaBytes := meta.encode()
|
||||
_, err := sock.Write(metaBytes)
|
||||
stream := stream{}
|
||||
stream.init(sock)
|
||||
local, _, _ := net.SplitHostPort(sock.LocalAddr().String())
|
||||
remote, _, _ := net.SplitHostPort(sock.RemoteAddr().String())
|
||||
remotelinklocal := net.ParseIP(remote).IsLinkLocalUnicast()
|
||||
name := "tcp://" + sock.RemoteAddr().String()
|
||||
link, err := iface.core.link.create(&stream, name, "tcp", local, remote, incoming, remotelinklocal)
|
||||
if err != nil {
|
||||
return
|
||||
iface.core.log.Println(err)
|
||||
panic(err)
|
||||
}
|
||||
if iface.tcp_timeout > 0 {
|
||||
sock.SetReadDeadline(time.Now().Add(iface.tcp_timeout))
|
||||
}
|
||||
_, err = sock.Read(metaBytes)
|
||||
if err != nil {
|
||||
return
|
||||
}
|
||||
meta = version_metadata{} // Reset to zero value
|
||||
if !meta.decode(metaBytes) || !meta.check() {
|
||||
// Failed to decode and check the metadata
|
||||
// If it's a version mismatch issue, then print an error message
|
||||
base := version_getBaseMetadata()
|
||||
if meta.meta == base.meta {
|
||||
if meta.ver > base.ver {
|
||||
iface.core.log.Errorln("Failed to connect to node:", sock.RemoteAddr().String(), "version:", meta.ver)
|
||||
} else if meta.ver == base.ver && meta.minorVer > base.minorVer {
|
||||
iface.core.log.Errorln("Failed to connect to node:", sock.RemoteAddr().String(), "version:", fmt.Sprintf("%d.%d", meta.ver, meta.minorVer))
|
||||
}
|
||||
}
|
||||
// TODO? Block forever to prevent future connection attempts? suppress future messages about the same node?
|
||||
return
|
||||
}
|
||||
remoteAddr, _, e1 := net.SplitHostPort(sock.RemoteAddr().String())
|
||||
localAddr, _, e2 := net.SplitHostPort(sock.LocalAddr().String())
|
||||
if e1 != nil || e2 != nil {
|
||||
return
|
||||
}
|
||||
info := tcpInfo{ // used as a map key, so don't include ephemeral link key
|
||||
box: meta.box,
|
||||
sig: meta.sig,
|
||||
localAddr: localAddr,
|
||||
remoteAddr: remoteAddr,
|
||||
}
|
||||
if iface.isAlreadyConnected(info) {
|
||||
return
|
||||
}
|
||||
// Quit the parent call if this is a connection to ourself
|
||||
equiv := func(k1, k2 []byte) bool {
|
||||
for idx := range k1 {
|
||||
if k1[idx] != k2[idx] {
|
||||
return false
|
||||
}
|
||||
}
|
||||
return true
|
||||
}
|
||||
if equiv(meta.box[:], iface.core.boxPub[:]) {
|
||||
return
|
||||
}
|
||||
if equiv(meta.sig[:], iface.core.sigPub[:]) {
|
||||
return
|
||||
}
|
||||
// Check if we're authorized to connect to this key / IP
|
||||
if incoming && !iface.core.peers.isAllowedEncryptionPublicKey(&meta.box) {
|
||||
// Allow unauthorized peers if they're link-local
|
||||
raddrStr, _, _ := net.SplitHostPort(sock.RemoteAddr().String())
|
||||
raddr := net.ParseIP(raddrStr)
|
||||
if !raddr.IsLinkLocalUnicast() {
|
||||
return
|
||||
}
|
||||
}
|
||||
// Check if we already have a connection to this node, close and block if yes
|
||||
iface.mutex.Lock()
|
||||
/*if blockChan, isIn := iface.conns[info]; isIn {
|
||||
iface.mutex.Unlock()
|
||||
sock.Close()
|
||||
<-blockChan
|
||||
return
|
||||
}*/
|
||||
blockChan := make(chan struct{})
|
||||
iface.conns[info] = blockChan
|
||||
iface.mutex.Unlock()
|
||||
defer func() {
|
||||
iface.mutex.Lock()
|
||||
delete(iface.conns, info)
|
||||
iface.mutex.Unlock()
|
||||
close(blockChan)
|
||||
}()
|
||||
// Note that multiple connections to the same node are allowed
|
||||
// E.g. over different interfaces
|
||||
p := iface.core.peers.newPeer(&meta.box, &meta.sig, crypto.GetSharedKey(myLinkPriv, &meta.link), sock.RemoteAddr().String())
|
||||
p.linkOut = make(chan []byte, 1)
|
||||
in := func(bs []byte) {
|
||||
p.handlePacket(bs)
|
||||
}
|
||||
out := make(chan []byte, 1)
|
||||
defer close(out)
|
||||
go func() {
|
||||
// This goroutine waits for outgoing packets, link protocol traffic, or sends idle keep-alive traffic
|
||||
send := func(msg []byte) {
|
||||
msgLen := wire_encode_uint64(uint64(len(msg)))
|
||||
buf := net.Buffers{tcp_msg[:], msgLen, msg}
|
||||
buf.WriteTo(sock)
|
||||
atomic.AddUint64(&p.bytesSent, uint64(len(tcp_msg)+len(msgLen)+len(msg)))
|
||||
util.PutBytes(msg)
|
||||
}
|
||||
timerInterval := tcp_ping_interval
|
||||
timer := time.NewTimer(timerInterval)
|
||||
defer timer.Stop()
|
||||
for {
|
||||
select {
|
||||
case msg := <-p.linkOut:
|
||||
// Always send outgoing link traffic first, if needed
|
||||
send(msg)
|
||||
continue
|
||||
default:
|
||||
}
|
||||
// Otherwise wait reset the timer and wait for something to do
|
||||
timer.Stop()
|
||||
select {
|
||||
case <-timer.C:
|
||||
default:
|
||||
}
|
||||
timer.Reset(timerInterval)
|
||||
select {
|
||||
case _ = <-timer.C:
|
||||
send(nil) // TCP keep-alive traffic
|
||||
case msg := <-p.linkOut:
|
||||
send(msg)
|
||||
case msg, ok := <-out:
|
||||
if !ok {
|
||||
return
|
||||
}
|
||||
send(msg) // Block until the socket write has finished
|
||||
// Now inform the switch that we're ready for more traffic
|
||||
p.core.switchTable.idleIn <- p.port
|
||||
}
|
||||
}
|
||||
}()
|
||||
p.core.switchTable.idleIn <- p.port // Start in the idle state
|
||||
p.out = func(msg []byte) {
|
||||
defer func() { recover() }()
|
||||
out <- msg
|
||||
}
|
||||
p.close = func() { sock.Close() }
|
||||
go p.linkLoop()
|
||||
defer func() {
|
||||
// Put all of our cleanup here...
|
||||
p.core.peers.removePeer(p.port)
|
||||
}()
|
||||
us, _, _ := net.SplitHostPort(sock.LocalAddr().String())
|
||||
them, _, _ := net.SplitHostPort(sock.RemoteAddr().String())
|
||||
themNodeID := crypto.GetNodeID(&meta.box)
|
||||
themAddr := address.AddrForNodeID(themNodeID)
|
||||
themAddrString := net.IP(themAddr[:]).String()
|
||||
themString := fmt.Sprintf("%s@%s", themAddrString, them)
|
||||
iface.core.log.Infof("Connected: %s, source: %s", themString, us)
|
||||
err = iface.reader(sock, in) // In this goroutine, because of defers
|
||||
if err == nil {
|
||||
iface.core.log.Infof("Disconnected: %s, source: %s", themString, us)
|
||||
} else {
|
||||
iface.core.log.Infof("Disconnected: %s, source: %s, error: %s", themString, us, err)
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
// This reads from the socket into a []byte buffer for incomping messages.
|
||||
// It copies completed messages out of the cache into a new slice, and passes them to the peer struct via the provided `in func([]byte)` argument.
|
||||
// Then it shifts the incomplete fragments of data forward so future reads won't overwrite it.
|
||||
func (iface *tcpInterface) reader(sock net.Conn, in func([]byte)) error {
|
||||
bs := make([]byte, 2*tcp_msgSize)
|
||||
frag := bs[:0]
|
||||
for {
|
||||
if iface.tcp_timeout > 0 {
|
||||
sock.SetReadDeadline(time.Now().Add(iface.tcp_timeout))
|
||||
}
|
||||
n, err := sock.Read(bs[len(frag):])
|
||||
if n > 0 {
|
||||
frag = bs[:len(frag)+n]
|
||||
for {
|
||||
msg, ok, err2 := tcp_chop_msg(&frag)
|
||||
if err2 != nil {
|
||||
return fmt.Errorf("Message error: %v", err2)
|
||||
}
|
||||
if !ok {
|
||||
// We didn't get the whole message yet
|
||||
break
|
||||
}
|
||||
newMsg := append(util.GetBytes(), msg...)
|
||||
in(newMsg)
|
||||
util.Yield()
|
||||
}
|
||||
frag = append(bs[:0], frag...)
|
||||
}
|
||||
if err != nil || n == 0 {
|
||||
if err != io.EOF {
|
||||
return err
|
||||
}
|
||||
return nil
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
////////////////////////////////////////////////////////////////////////////////
|
||||
|
||||
// These are 4 bytes of padding used to catch if something went horribly wrong with the tcp connection.
|
||||
var tcp_msg = [...]byte{0xde, 0xad, 0xb1, 0x75} // "dead bits"
|
||||
|
||||
// This takes a pointer to a slice as an argument.
|
||||
// It checks if there's a complete message and, if so, slices out those parts and returns the message, true, and nil.
|
||||
// If there's no error, but also no complete message, it returns nil, false, and nil.
|
||||
// If there's an error, it returns nil, false, and the error, which the reader then handles (currently, by returning from the reader, which causes the connection to close).
|
||||
func tcp_chop_msg(bs *[]byte) ([]byte, bool, error) {
|
||||
// Returns msg, ok, err
|
||||
if len(*bs) < len(tcp_msg) {
|
||||
return nil, false, nil
|
||||
}
|
||||
for idx := range tcp_msg {
|
||||
if (*bs)[idx] != tcp_msg[idx] {
|
||||
return nil, false, errors.New("Bad message!")
|
||||
}
|
||||
}
|
||||
msgLen, msgLenLen := wire_decode_uint64((*bs)[len(tcp_msg):])
|
||||
if msgLen > tcp_msgSize {
|
||||
return nil, false, errors.New("Oversized message!")
|
||||
}
|
||||
msgBegin := len(tcp_msg) + msgLenLen
|
||||
msgEnd := msgBegin + int(msgLen)
|
||||
if msgLenLen == 0 || len(*bs) < msgEnd {
|
||||
// We don't have the full message
|
||||
// Need to buffer this and wait for the rest to come in
|
||||
return nil, false, nil
|
||||
}
|
||||
msg := (*bs)[msgBegin:msgEnd]
|
||||
(*bs) = (*bs)[msgEnd:]
|
||||
return msg, true, nil
|
||||
iface.core.log.Debugln("DEBUG: starting handler for", name)
|
||||
err = link.handler()
|
||||
iface.core.log.Debugln("DEBUG: stopped handler for", name, err)
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user