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Link refactor (#941)

Browse Source 
* Link refactoring

* More refactoring

* More tweaking

* Cleaner shutdowns, UNIX socket support, more tweaks

* Actorise links, remove mutex

* SOCKS support
This commit is contained in:
Neil Alexander 2022-09-17 20:07:00 +01:00 committed by GitHub
parent 414aaf6eb9
commit 5ef61faeff
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
18 changed files with 738 additions and 698 deletions
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15
cmd/yggdrasil/main.go
View File

@ -28,9 +28,9 @@ import (
"github.com/yggdrasil-network/yggdrasil-go/src/admin"
"github.com/yggdrasil-network/yggdrasil-go/src/config"
"github.com/yggdrasil-network/yggdrasil-go/src/defaults"
"github.com/yggdrasil-network/yggdrasil-go/src/ipv6rwc"
"github.com/yggdrasil-network/yggdrasil-go/src/core"
"github.com/yggdrasil-network/yggdrasil-go/src/ipv6rwc"
"github.com/yggdrasil-network/yggdrasil-go/src/multicast"
"github.com/yggdrasil-network/yggdrasil-go/src/tuntap"
"github.com/yggdrasil-network/yggdrasil-go/src/version"
@ -290,10 +290,7 @@ func run(args yggArgs, ctx context.Context, done chan struct{}) {
if err != nil {
panic(err)
}
options := []core.SetupOption{
core.IfName(cfg.IfName),
core.IfMTU(cfg.IfMTU),
}
options := []core.SetupOption{}
for _, addr := range cfg.Listen {
options = append(options, core.ListenAddress(addr))
}
@ -325,7 +322,9 @@ func run(args yggArgs, ctx context.Context, done chan struct{}) {
if n.admin, err = admin.New(n.core, logger, options...); err != nil {
panic(err)
}
n.admin.SetupAdminHandlers()
if n.admin != nil {
n.admin.SetupAdminHandlers()
}
}
// Setup the multicast module.
@ -342,7 +341,7 @@ func run(args yggArgs, ctx context.Context, done chan struct{}) {
if n.multicast, err = multicast.New(n.core, logger, options...); err != nil {
panic(err)
}
if n.admin != nil {
if n.admin != nil && n.multicast != nil {
n.multicast.SetupAdminHandlers(n.admin)
}
}
@ -356,7 +355,7 @@ func run(args yggArgs, ctx context.Context, done chan struct{}) {
if n.tuntap, err = tuntap.New(ipv6rwc.NewReadWriteCloser(n.core), logger, options...); err != nil {
panic(err)
}
if n.admin != nil {
if n.admin != nil && n.tuntap != nil {
n.tuntap.SetupAdminHandlers(n.admin)
}
}

5
contrib/mobile/mobile.go
View File

@ -55,10 +55,7 @@ func (m *Yggdrasil) StartJSON(configjson []byte) error {
if err != nil {
panic(err)
}
options := []core.SetupOption{
core.IfName("none"),
core.IfMTU(m.config.IfMTU),
}
options := []core.SetupOption{}
for _, peer := range m.config.Peers {
options = append(options, core.Peer{URI: peer})
}

5
src/admin/admin.go
View File

@ -175,6 +175,9 @@ func (a *AdminSocket) IsStarted() bool {
// Stop will stop the admin API and close the socket.
func (a *AdminSocket) Stop() error {
if a == nil {
return nil
}
if a.listener != nil {
select {
case <-a.done:
@ -321,6 +324,8 @@ type DataUnit uint64
func (d DataUnit) String() string {
switch {
case d > 1024*1024*1024*1024:
return fmt.Sprintf("%2.ftb", float64(d)/1024/1024/1024/1024)
case d > 1024*1024*1024:
return fmt.Sprintf("%2.fgb", float64(d)/1024/1024/1024)
case d > 1024*1024:

25
src/core/api.go
View File

@ -2,6 +2,7 @@ package core
import (
"crypto/ed25519"
"fmt"
"sync/atomic"
"time"
@ -15,6 +16,7 @@ import (
//"sort"
//"time"
"github.com/Arceliar/phony"
"github.com/yggdrasil-network/yggdrasil-go/src/address"
"github.com/yggdrasil-network/yggdrasil-go/src/util"
//"github.com/yggdrasil-network/yggdrasil-go/src/crypto"
@ -68,11 +70,11 @@ func (c *Core) GetSelf() SelfInfo {
func (c *Core) GetPeers() []PeerInfo {
var peers []PeerInfo
names := make(map[net.Conn]string)
c.links.mutex.Lock()
for _, info := range c.links.links {
names[info.conn] = info.lname
}
c.links.mutex.Unlock()
phony.Block(&c.links, func() {
for _, info := range c.links._links {
names[info.conn] = info.lname
}
})
ps := c.PacketConn.PacketConn.Debug.GetPeers()
for _, p := range ps {
var info PeerInfo
@ -136,8 +138,17 @@ func (c *Core) GetSessions() []SessionInfo {
// Listen starts a new listener (either TCP or TLS). The input should be a url.URL
// parsed from a string of the form e.g. "tcp://a.b.c.d:e". In the case of a
// link-local address, the interface should be provided as the second argument.
func (c *Core) Listen(u *url.URL, sintf string) (*TcpListener, error) {
return c.links.tcp.listenURL(u, sintf)
func (c *Core) Listen(u *url.URL, sintf string) (*Listener, error) {
switch u.Scheme {
case "tcp":
return c.links.tcp.listen(u, sintf)
case "tls":
return c.links.tls.listen(u, sintf)
case "unix":
return c.links.unix.listen(u, sintf)
default:
return nil, fmt.Errorf("unrecognised scheme %q", u.Scheme)
}
}
// Address gets the IPv6 address of the Yggdrasil node. This is always a /128

33
src/core/core.go
View File

@ -40,8 +40,6 @@ type Core struct {
_listeners map[ListenAddress]struct{} // configurable after startup
nodeinfo NodeInfo // immutable after startup
nodeinfoPrivacy NodeInfoPrivacy // immutable after startup
ifname IfName // immutable after startup
ifmtu IfMTU // immutable after startup
_allowedPublicKeys map[[32]byte]struct{} // configurable after startup
}
}
@ -50,6 +48,12 @@ func New(secret ed25519.PrivateKey, logger util.Logger, opts ...SetupOption) (*C
c := &Core{
log: logger,
}
if name := version.BuildName(); name != "unknown" {
c.log.Infoln("Build name:", name)
}
if version := version.BuildVersion(); version != "unknown" {
c.log.Infoln("Build version:", version)
}
c.ctx, c.cancel = context.WithCancel(context.Background())
// Take a copy of the private key so that it is in our own memory space.
if len(secret) != ed25519.PrivateKeySize {
@ -78,15 +82,17 @@ func New(secret ed25519.PrivateKey, logger util.Logger, opts ...SetupOption) (*C
if err := c.proto.nodeinfo.setNodeInfo(c.config.nodeinfo, bool(c.config.nodeinfoPrivacy)); err != nil {
return nil, fmt.Errorf("error setting node info: %w", err)
}
c.addPeerTimer = time.AfterFunc(time.Minute, func() {
c.Act(nil, c._addPeerLoop)
})
if name := version.BuildName(); name != "unknown" {
c.log.Infoln("Build name:", name)
}
if version := version.BuildVersion(); version != "unknown" {
c.log.Infoln("Build version:", version)
for listenaddr := range c.config._listeners {
u, err := url.Parse(string(listenaddr))
if err != nil {
c.log.Errorf("Invalid listener URI %q specified, ignoring\n", listenaddr)
continue
}
if _, err = c.links.listen(u, ""); err != nil {
c.log.Errorf("Failed to start listener %q: %s\n", listenaddr, err)
}
}
c.Act(nil, c._addPeerLoop)
return c, nil
}
@ -94,10 +100,11 @@ func New(secret ed25519.PrivateKey, logger util.Logger, opts ...SetupOption) (*C
// configure them. The loop ensures that disconnected peers will eventually
// be reconnected with.
func (c *Core) _addPeerLoop() {
if c.addPeerTimer == nil {
select {
case <-c.ctx.Done():
return
default:
}
// Add peers from the Peers section
for peer := range c.config._peers {
go func(peer string, intf string) {
@ -128,12 +135,12 @@ func (c *Core) Stop() {
// This function is unsafe and should only be ran by the core actor.
func (c *Core) _close() error {
c.cancel()
_ = c.links.shutdown()
err := c.PacketConn.Close()
if c.addPeerTimer != nil {
c.addPeerTimer.Stop()
c.addPeerTimer = nil
}
_ = c.links.stop()
return err
}

4
src/core/core_test.go
View File

@ -37,10 +37,10 @@ func CreateAndConnectTwo(t testing.TB, verbose bool) (nodeA *Core, nodeB *Core)
t.Fatal(err)
}
logger := GetLoggerWithPrefix("", false)
if nodeA, err = New(skA, logger, ListenAddress("tcp://127.0.0.1:0"), IfName("none")); err != nil {
if nodeA, err = New(skA, logger, ListenAddress("tcp://127.0.0.1:0")); err != nil {
t.Fatal(err)
}
if nodeB, err = New(skB, logger, ListenAddress("tcp://127.0.0.1:0"), IfName("none")); err != nil {
if nodeB, err = New(skB, logger, ListenAddress("tcp://127.0.0.1:0")); err != nil {
t.Fatal(err)
}

278
src/core/link.go
View File

@ -2,7 +2,6 @@ package core
import (
"bytes"
"crypto/ed25519"
"encoding/hex"
"errors"
"fmt"
@ -10,7 +9,6 @@ import (
"net"
"net/url"
"strings"
"sync"
//"sync/atomic"
"time"
@ -20,22 +18,22 @@ import (
"github.com/Arceliar/phony"
"github.com/yggdrasil-network/yggdrasil-go/src/address"
"github.com/yggdrasil-network/yggdrasil-go/src/util"
"golang.org/x/net/proxy"
//"github.com/Arceliar/phony" // TODO? use instead of mutexes
)
type links struct {
core *Core
mutex sync.RWMutex // protects links below
links map[linkInfo]*link
tcp tcp // TCP interface support
stopped chan struct{}
phony.Inbox
core *Core
tcp *linkTCP // TCP interface support
tls *linkTLS // TLS interface support
unix *linkUNIX // UNIX interface support
socks *linkSOCKS // SOCKS interface support
_links map[linkInfo]*link // *link is nil if connection in progress
// TODO timeout (to remove from switch), read from config.ReadTimeout
}
// linkInfo is used as a map key
type linkInfo struct {
key keyArray
linkType string // Type of link, e.g. TCP, AWDL
local string // Local name or address
remote string // Remote name or address
@ -49,19 +47,30 @@ type link struct {
info linkInfo
incoming bool
force bool
closed chan struct{}
}
type linkOptions struct {
pinnedEd25519Keys map[keyArray]struct{}
}
type Listener struct {
net.Listener
closed chan struct{}
}
func (l *Listener) Close() error {
err := l.Listener.Close()
<-l.closed
return err
}
func (l *links) init(c *Core) error {
l.core = c
l.mutex.Lock()
l.links = make(map[linkInfo]*link)
l.mutex.Unlock()
l.stopped = make(chan struct{})
l.tcp = l.newLinkTCP()
l.tls = l.newLinkTLS(l.tcp)
l.unix = l.newLinkUNIX()
l.socks = l.newLinkSOCKS()
l._links = make(map[linkInfo]*link)
var listeners []ListenAddress
phony.Block(c, func() {
@ -70,96 +79,160 @@ func (l *links) init(c *Core) error {
listeners = append(listeners, listener)
}
})
if err := l.tcp.init(l, listeners); err != nil {
c.log.Errorln("Failed to start TCP interface")
return err
}
return nil
}
func (l *links) shutdown() error {
phony.Block(l.tcp, func() {
for l := range l.tcp._listeners {
l.Close()
}
})
phony.Block(l.tls, func() {
for l := range l.tls._listeners {
l.Close()
}
})
phony.Block(l.unix, func() {
for l := range l.unix._listeners {
l.Close()
}
})
return nil
}
func (l *links) isConnectedTo(info linkInfo) bool {
var isConnected bool
phony.Block(l, func() {
_, isConnected = l._links[info]
})
return isConnected
}
func (l *links) call(u *url.URL, sintf string) error {
tcpOpts := tcpOptions{}
if pubkeys, ok := u.Query()["key"]; ok && len(pubkeys) > 0 {
tcpOpts.pinnedEd25519Keys = make(map[keyArray]struct{})
for _, pubkey := range pubkeys {
if sigPub, err := hex.DecodeString(pubkey); err == nil {
var sigPubKey keyArray
copy(sigPubKey[:], sigPub)
tcpOpts.pinnedEd25519Keys[sigPubKey] = struct{}{}
}
info := linkInfoFor(u.Scheme, sintf, u.Host)
if l.isConnectedTo(info) {
return fmt.Errorf("already connected to this node")
}
options := linkOptions{
pinnedEd25519Keys: map[keyArray]struct{}{},
}
for _, pubkey := range u.Query()["key"] {
if sigPub, err := hex.DecodeString(pubkey); err == nil {
var sigPubKey keyArray
copy(sigPubKey[:], sigPub)
options.pinnedEd25519Keys[sigPubKey] = struct{}{}
}
}
switch u.Scheme {
switch info.linkType {
case "tcp":
l.tcp.call(u.Host, tcpOpts, sintf)
go func() {
if err := l.tcp.dial(u, options, sintf); err != nil {
l.core.log.Warnf("Failed to dial TCP %s: %s\n", u.Host, err)
}
}()
case "socks":
tcpOpts.socksProxyAddr = u.Host
if u.User != nil {
tcpOpts.socksProxyAuth = &proxy.Auth{}
tcpOpts.socksProxyAuth.User = u.User.Username()
tcpOpts.socksProxyAuth.Password, _ = u.User.Password()
}
tcpOpts.upgrade = l.tcp.tls.forDialer // TODO make this configurable
pathtokens := strings.Split(strings.Trim(u.Path, "/"), "/")
l.tcp.call(pathtokens[0], tcpOpts, sintf)
go func() {
if err := l.socks.dial(u, options); err != nil {
l.core.log.Warnf("Failed to dial SOCKS %s: %s\n", u.Host, err)
}
}()
case "tls":
tcpOpts.upgrade = l.tcp.tls.forDialer
// SNI headers must contain hostnames and not IP addresses, so we must make sure
// that we do not populate the SNI with an IP literal. We do this by splitting
// the host-port combo from the query option and then seeing if it parses to an
// IP address successfully or not.
var tlsSNI string
if sni := u.Query().Get("sni"); sni != "" {
if net.ParseIP(sni) == nil {
tcpOpts.tlsSNI = sni
tlsSNI = sni
}
}
// If the SNI is not configured still because the above failed then we'll try
// again but this time we'll use the host part of the peering URI instead.
if tcpOpts.tlsSNI == "" {
if tlsSNI == "" {
if host, _, err := net.SplitHostPort(u.Host); err == nil && net.ParseIP(host) == nil {
tcpOpts.tlsSNI = host
tlsSNI = host
}
}
l.tcp.call(u.Host, tcpOpts, sintf)
go func() {
if err := l.tls.dial(u, options, sintf, tlsSNI); err != nil {
l.core.log.Warnf("Failed to dial TLS %s: %s\n", u.Host, err)
}
}()
case "unix":
go func() {
if err := l.unix.dial(u, options, sintf); err != nil {
l.core.log.Warnf("Failed to dial UNIX %s: %s\n", u.Host, err)
}
}()
default:
return errors.New("unknown call scheme: " + u.Scheme)
}
return nil
}
func (l *links) create(conn net.Conn, name, linkType, local, remote string, incoming, force bool, options linkOptions) (*link, error) {
// Technically anything unique would work for names, but let's pick something human readable, just for debugging
func (l *links) listen(u *url.URL, sintf string) (*Listener, error) {
var listener *Listener
var err error
switch u.Scheme {
case "tcp":
listener, err = l.tcp.listen(u, sintf)
case "tls":
listener, err = l.tls.listen(u, sintf)
case "unix":
listener, err = l.unix.listen(u, sintf)
default:
return nil, fmt.Errorf("unrecognised scheme %q", u.Scheme)
}
return listener, err
}
func (l *links) create(conn net.Conn, name string, info linkInfo, incoming, force bool, options linkOptions) error {
intf := link{
conn: &linkConn{
Conn: conn,
up: time.Now(),
},
lname: name,
links: l,
options: options,
info: linkInfo{
linkType: linkType,
local: local,
remote: remote,
},
lname: name,
links: l,
options: options,
info: info,
incoming: incoming,
force: force,
}
return &intf, nil
}
func (l *links) stop() error {
close(l.stopped)
if err := l.tcp.stop(); err != nil {
return err
}
go func() {
if err := intf.handler(); err != nil {
l.core.log.Errorf("Link handler %s error (%s): %s", name, conn.RemoteAddr(), err)
}
}()
return nil
}
func (intf *link) handler() (chan struct{}, error) {
// TODO split some of this into shorter functions, so it's easier to read, and for the FIXME duplicate peer issue mentioned later
func (intf *link) handler() error {
defer intf.conn.Close()
// Don't connect to this link more than once.
if intf.links.isConnectedTo(intf.info) {
return fmt.Errorf("already connected to this node")
}
// Mark the connection as in progress.
phony.Block(intf.links, func() {
intf.links._links[intf.info] = nil
})
// When we're done, clean up the connection entry.
defer phony.Block(intf.links, func() {
delete(intf.links._links, intf.info)
})
// TODO split some of this into shorter functions, so it's easier to read, and for the FIXME duplicate peer issue mentioned later
meta := version_getBaseMetadata()
meta.key = intf.links.core.public
metaBytes := meta.encode()
@ -172,10 +245,10 @@ func (intf *link) handler() (chan struct{}, error) {
err = errors.New("incomplete metadata send")
}
}) {
return nil, errors.New("timeout on metadata send")
return errors.New("timeout on metadata send")
}
if err != nil {
return nil, err
return fmt.Errorf("write handshake: %w", err)
}
if !util.FuncTimeout(30*time.Second, func() {
var n int
@ -184,15 +257,15 @@ func (intf *link) handler() (chan struct{}, error) {
err = errors.New("incomplete metadata recv")
}
}) {
return nil, errors.New("timeout on metadata recv")
return errors.New("timeout on metadata recv")
}
if err != nil {
return nil, err
return fmt.Errorf("read handshake: %w", err)
}
meta = version_metadata{}
base := version_getBaseMetadata()
if !meta.decode(metaBytes) {
return nil, errors.New("failed to decode metadata")
return errors.New("failed to decode metadata")
}
if !meta.check() {
var connectError string
@ -207,16 +280,16 @@ func (intf *link) handler() (chan struct{}, error) {
fmt.Sprintf("%d.%d", base.ver, base.minorVer),
fmt.Sprintf("%d.%d", meta.ver, meta.minorVer),
)
return nil, errors.New("remote node is incompatible version")
return errors.New("remote node is incompatible version")
}
// Check if the remote side matches the keys we expected. This is a bit of a weak
// check - in future versions we really should check a signature or something like that.
if pinned := intf.options.pinnedEd25519Keys; pinned != nil {
if pinned := intf.options.pinnedEd25519Keys; len(pinned) > 0 {
var key keyArray
copy(key[:], meta.key)
if _, allowed := pinned[key]; !allowed {
intf.links.core.log.Errorf("Failed to connect to node: %q sent ed25519 key that does not match pinned keys", intf.name())
return nil, fmt.Errorf("failed to connect: host sent ed25519 key that does not match pinned keys")
return fmt.Errorf("failed to connect: host sent ed25519 key that does not match pinned keys")
}
}
// Check if we're authorized to connect to this key / IP
@ -232,55 +305,50 @@ func (intf *link) handler() (chan struct{}, error) {
intf.links.core.log.Warnf("%s connection from %s forbidden: AllowedEncryptionPublicKeys does not contain key %s",
strings.ToUpper(intf.info.linkType), intf.info.remote, hex.EncodeToString(meta.key))
intf.close()
return nil, nil
return fmt.Errorf("forbidden connection")
}
// Check if we already have a link to this node
copy(intf.info.key[:], meta.key)
intf.links.mutex.Lock()
if oldIntf, isIn := intf.links.links[intf.info]; isIn {
intf.links.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.links.core.log.Debugln("DEBUG: found existing interface for", intf.name())
return oldIntf.closed, nil
} else {
intf.closed = make(chan struct{})
intf.links.links[intf.info] = intf
defer func() {
intf.links.mutex.Lock()
delete(intf.links.links, intf.info)
intf.links.mutex.Unlock()
close(intf.closed)
}()
intf.links.core.log.Debugln("DEBUG: registered interface for", intf.name())
}
intf.links.mutex.Unlock()
themAddr := address.AddrForKey(ed25519.PublicKey(intf.info.key[:]))
themAddrString := net.IP(themAddr[:]).String()
themString := fmt.Sprintf("%s@%s", themAddrString, intf.info.remote)
phony.Block(intf.links, func() {
intf.links._links[intf.info] = intf
})
remoteAddr := net.IP(address.AddrForKey(meta.key)[:]).String()
remoteStr := fmt.Sprintf("%s@%s", remoteAddr, intf.info.remote)
localStr := intf.conn.LocalAddr()
intf.links.core.log.Infof("Connected %s: %s, source %s",
strings.ToUpper(intf.info.linkType), themString, intf.info.local)
// Run the handler
err = intf.links.core.HandleConn(ed25519.PublicKey(intf.info.key[:]), intf.conn)
strings.ToUpper(intf.info.linkType), remoteStr, localStr)
// TODO don't report an error if it's just a 'use of closed network connection'
if err != nil {
if err = intf.links.core.HandleConn(meta.key, intf.conn); err != nil && err != io.EOF {
intf.links.core.log.Infof("Disconnected %s: %s, source %s; error: %s",
strings.ToUpper(intf.info.linkType), themString, intf.info.local, err)
strings.ToUpper(intf.info.linkType), remoteStr, localStr, err)
} else {
intf.links.core.log.Infof("Disconnected %s: %s, source %s",
strings.ToUpper(intf.info.linkType), themString, intf.info.local)
strings.ToUpper(intf.info.linkType), remoteStr, localStr)
}
return nil, err
return nil
}
func (intf *link) close() {
intf.conn.Close()
func (intf *link) close() error {
return intf.conn.Close()
}
func (intf *link) name() string {
return intf.lname
}
func linkInfoFor(linkType, sintf, remote string) linkInfo {
if h, _, err := net.SplitHostPort(remote); err == nil {
remote = h
}
return linkInfo{
linkType: linkType,
local: sintf,
remote: remote,
}
}
type linkConn struct {
// tx and rx are at the beginning of the struct to ensure 64-bit alignment
// on 32-bit platforms, see https://pkg.go.dev/sync/atomic#pkg-note-BUG

52
src/core/link_socks.go Normal file
View File

@ -0,0 +1,52 @@
package core
import (
"fmt"
"net"
"net/url"
"strings"
"golang.org/x/net/proxy"
)
type linkSOCKS struct {
*links
}
func (l *links) newLinkSOCKS() *linkSOCKS {
lt := &linkSOCKS{
links: l,
}
return lt
}
func (l *linkSOCKS) dial(url *url.URL, options linkOptions) error {
info := linkInfoFor("socks", "", url.Path)
if l.links.isConnectedTo(info) {
return fmt.Errorf("duplicate connection attempt")
}
proxyAuth := &proxy.Auth{}
proxyAuth.User = url.User.Username()
proxyAuth.Password, _ = url.User.Password()
dialer, err := proxy.SOCKS5("tcp", url.Host, proxyAuth, proxy.Direct)
if err != nil {
return fmt.Errorf("failed to configure proxy")
}
pathtokens := strings.Split(strings.Trim(url.Path, "/"), "/")
conn, err := dialer.Dial("tcp", pathtokens[0])
if err != nil {
return err
}
return l.handler(url.String(), info, conn, options, false)
}
func (l *linkSOCKS) handler(name string, info linkInfo, conn net.Conn, options linkOptions, incoming bool) error {
return l.links.create(
conn, // connection
name, // connection name
info, // connection info
incoming, // not incoming
false, // not forced
options, // connection options
)
}

183
src/core/link_tcp.go Normal file
View File

@ -0,0 +1,183 @@
package core
import (
"context"
"fmt"
"net"
"net/url"
"strings"
"time"
"github.com/Arceliar/phony"
)
type linkTCP struct {
phony.Inbox
*links
listener *net.ListenConfig
_listeners map[*Listener]context.CancelFunc
}
func (l *links) newLinkTCP() *linkTCP {
lt := &linkTCP{
links: l,
listener: &net.ListenConfig{
KeepAlive: -1,
},
_listeners: map[*Listener]context.CancelFunc{},
}
lt.listener.Control = lt.tcpContext
return lt
}
func (l *linkTCP) dial(url *url.URL, options linkOptions, sintf string) error {
info := linkInfoFor("tcp", sintf, strings.SplitN(url.Host, "%", 2)[0])
if l.links.isConnectedTo(info) {
return fmt.Errorf("duplicate connection attempt")
}
addr, err := net.ResolveTCPAddr("tcp", url.Host)
if err != nil {
return err
}
addr.Zone = sintf
dialer, err := l.dialerFor(addr.String(), sintf)
if err != nil {
return err
}
conn, err := dialer.DialContext(l.core.ctx, "tcp", addr.String())
if err != nil {
return err
}
return l.handler(url.String(), info, conn, options, false)
}
func (l *linkTCP) listen(url *url.URL, sintf string) (*Listener, error) {
ctx, cancel := context.WithCancel(l.core.ctx)
hostport := url.Host
if sintf != "" {
if host, port, err := net.SplitHostPort(hostport); err == nil {
hostport = fmt.Sprintf("[%s%%%s]:%s", host, sintf, port)
}
}
listener, err := l.listener.Listen(ctx, "tcp", hostport)
if err != nil {
cancel()
return nil, err
}
entry := &Listener{
Listener: listener,
closed: make(chan struct{}),
}
phony.Block(l, func() {
l._listeners[entry] = cancel
})
l.core.log.Printf("TCP listener started on %s", listener.Addr())
go func() {
defer phony.Block(l, func() {
delete(l._listeners, entry)
})
for {
conn, err := listener.Accept()
if err != nil {
cancel()
break
}
addr := conn.RemoteAddr().(*net.TCPAddr)
name := fmt.Sprintf("tls://%s", addr)
info := linkInfoFor("tcp", sintf, strings.SplitN(addr.IP.String(), "%", 2)[0])
if err = l.handler(name, info, conn, linkOptions{}, true); err != nil {
l.core.log.Errorln("Failed to create inbound link:", err)
}
}
listener.Close()
close(entry.closed)
l.core.log.Printf("TCP listener stopped on %s", listener.Addr())
}()
return entry, nil
}
func (l *linkTCP) handler(name string, info linkInfo, conn net.Conn, options linkOptions, incoming bool) error {
return l.links.create(
conn, // connection
name, // connection name
info, // connection info
incoming, // not incoming
false, // not forced
options, // connection options
)
}
// Returns the address of the listener.
func (l *linkTCP) getAddr() *net.TCPAddr {
// TODO: Fix this, because this will currently only give a single address
// to multicast.go, which obviously is not great, but right now multicast.go
// doesn't have the ability to send more than one address in a packet either
var addr *net.TCPAddr
phony.Block(l, func() {
for listener := range l._listeners {
addr = listener.Addr().(*net.TCPAddr)
}
})
return addr
}
func (l *linkTCP) dialerFor(saddr, sintf string) (*net.Dialer, error) {
dst, err := net.ResolveTCPAddr("tcp", saddr)
if err != nil {
return nil, err
}
if dst.IP.IsLinkLocalUnicast() {
dst.Zone = sintf
if dst.Zone == "" {
return nil, fmt.Errorf("link-local address requires a zone")
}
}
dialer := &net.Dialer{
Timeout: time.Second * 5,
KeepAlive: -1,
Control: l.tcpContext,
}
if sintf != "" {
dialer.Control = l.getControl(sintf)
ief, err := net.InterfaceByName(sintf)
if err != nil {
return nil, fmt.Errorf("interface %q not found", sintf)
}
if ief.Flags&net.FlagUp == 0 {
return nil, fmt.Errorf("interface %q is not up", sintf)
}
addrs, err := ief.Addrs()
if err != nil {
return nil, fmt.Errorf("interface %q addresses not available: %w", sintf, err)
}
for addrindex, addr := range addrs {
src, _, err := net.ParseCIDR(addr.String())
if err != nil {
continue
}
if !src.IsGlobalUnicast() && !src.IsLinkLocalUnicast() {
continue
}
bothglobal := src.IsGlobalUnicast() == dst.IP.IsGlobalUnicast()
bothlinklocal := src.IsLinkLocalUnicast() == dst.IP.IsLinkLocalUnicast()
if !bothglobal && !bothlinklocal {
continue
}
if (src.To4() != nil) != (dst.IP.To4() != nil) {
continue
}
if bothglobal || bothlinklocal || addrindex == len(addrs)-1 {
dialer.LocalAddr = &net.TCPAddr{
IP: src,
Port: 0,
Zone: sintf,
}
break
}
}
if dialer.LocalAddr == nil {
return nil, fmt.Errorf("no suitable source address found on interface %q", sintf)
}
}
return dialer, nil
}

4
src/core/tcp_darwin.go → src/core/link_tcp_darwin.go
View File

@ -11,7 +11,7 @@ import (
// WARNING: This context is used both by net.Dialer and net.Listen in tcp.go
func (t *tcp) tcpContext(network, address string, c syscall.RawConn) error {
func (t *linkTCP) tcpContext(network, address string, c syscall.RawConn) error {
var control error
var recvanyif error
@ -28,6 +28,6 @@ func (t *tcp) tcpContext(network, address string, c syscall.RawConn) error {
}
}
func (t *tcp) getControl(sintf string) func(string, string, syscall.RawConn) error {
func (t *linkTCP) getControl(sintf string) func(string, string, syscall.RawConn) error {
return t.tcpContext
}

4
src/core/tcp_linux.go → src/core/link_tcp_linux.go
View File

@ -11,7 +11,7 @@ import (
// WARNING: This context is used both by net.Dialer and net.Listen in tcp.go
func (t *tcp) tcpContext(network, address string, c syscall.RawConn) error {
func (t *linkTCP) tcpContext(network, address string, c syscall.RawConn) error {
var control error
var bbr error
@ -31,7 +31,7 @@ func (t *tcp) tcpContext(network, address string, c syscall.RawConn) error {
return nil
}
func (t *tcp) getControl(sintf string) func(string, string, syscall.RawConn) error {
func (t *linkTCP) getControl(sintf string) func(string, string, syscall.RawConn) error {
return func(network, address string, c syscall.RawConn) error {
var err error
btd := func(fd uintptr) {

4
src/core/tcp_other.go → src/core/link_tcp_other.go
View File

@ -9,10 +9,10 @@ import (
// WARNING: This context is used both by net.Dialer and net.Listen in tcp.go
func (t *tcp) tcpContext(network, address string, c syscall.RawConn) error {
func (t *linkTCP) tcpContext(network, address string, c syscall.RawConn) error {
return nil
}
func (t *tcp) getControl(sintf string) func(string, string, syscall.RawConn) error {
func (t *linkTCP) getControl(sintf string) func(string, string, syscall.RawConn) error {
return t.tcpContext
}

171
src/core/link_tls.go Normal file
View File

@ -0,0 +1,171 @@
package core
import (
"bytes"
"context"
"crypto/rand"
"crypto/tls"
"crypto/x509"
"crypto/x509/pkix"
"encoding/hex"
"encoding/pem"
"fmt"
"math/big"
"net"
"net/url"
"strings"
"time"
"github.com/Arceliar/phony"
)
type linkTLS struct {
phony.Inbox
*links
tcp *linkTCP
listener *net.ListenConfig
config *tls.Config
_listeners map[*Listener]context.CancelFunc
}
func (l *links) newLinkTLS(tcp *linkTCP) *linkTLS {
lt := &linkTLS{
links: l,
tcp: tcp,
listener: &net.ListenConfig{
Control: tcp.tcpContext,
KeepAlive: -1,
},
_listeners: map[*Listener]context.CancelFunc{},
}
var err error
lt.config, err = lt.generateConfig()
if err != nil {
panic(err)
}
return lt
}
func (l *linkTLS) dial(url *url.URL, options linkOptions, sintf, sni string) error {
info := linkInfoFor("tls", sintf, strings.SplitN(url.Host, "%", 2)[0])
if l.links.isConnectedTo(info) {
return fmt.Errorf("duplicate connection attempt")
}
addr, err := net.ResolveTCPAddr("tcp", url.Host)
if err != nil {
return err
}
addr.Zone = sintf
dialer, err := l.tcp.dialerFor(addr.String(), sintf)
if err != nil {
return err
}
tlsconfig := l.config.Clone()
tlsconfig.ServerName = sni
tlsdialer := &tls.Dialer{
NetDialer: dialer,
Config: tlsconfig,
}
conn, err := tlsdialer.DialContext(l.core.ctx, "tcp", addr.String())
if err != nil {
return err
}
return l.handler(url.String(), info, conn, options, false)
}
func (l *linkTLS) listen(url *url.URL, sintf string) (*Listener, error) {
ctx, cancel := context.WithCancel(l.core.ctx)
hostport := url.Host
if sintf != "" {
if host, port, err := net.SplitHostPort(hostport); err == nil {
hostport = fmt.Sprintf("[%s%%%s]:%s", host, sintf, port)
}
}
listener, err := l.listener.Listen(ctx, "tcp", hostport)
if err != nil {
cancel()
return nil, err
}
tlslistener := tls.NewListener(listener, l.config)
entry := &Listener{
Listener: tlslistener,
closed: make(chan struct{}),
}
phony.Block(l, func() {
l._listeners[entry] = cancel
})
l.core.log.Printf("TLS listener started on %s", listener.Addr())
go func() {
defer phony.Block(l, func() {
delete(l._listeners, entry)
})
for {
conn, err := tlslistener.Accept()
if err != nil {
cancel()
break
}
addr := conn.RemoteAddr().(*net.TCPAddr)
name := fmt.Sprintf("tls://%s", addr)
info := linkInfoFor("tls", sintf, strings.SplitN(addr.IP.String(), "%", 2)[0])
if err = l.handler(name, info, conn, linkOptions{}, true); err != nil {
l.core.log.Errorln("Failed to create inbound link:", err)
}
}
tlslistener.Close()
close(entry.closed)
l.core.log.Printf("TLS listener stopped on %s", listener.Addr())
}()
return entry, nil
}
func (l *linkTLS) generateConfig() (*tls.Config, error) {
certBuf := &bytes.Buffer{}
// TODO: because NotAfter is finite, we should add some mechanism to
// regenerate the certificate and restart the listeners periodically
// for nodes with very high uptimes. Perhaps regenerate certs and restart
// listeners every few months or so.
cert := x509.Certificate{
SerialNumber: big.NewInt(1),
Subject: pkix.Name{
CommonName: hex.EncodeToString(l.links.core.public[:]),
},
NotBefore: time.Now(),
NotAfter: time.Now().Add(time.Hour * 24 * 365),
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
BasicConstraintsValid: true,
}
certbytes, err := x509.CreateCertificate(rand.Reader, &cert, &cert, l.links.core.public, l.links.core.secret)
if err != nil {
return nil, err
}
if err := pem.Encode(certBuf, &pem.Block{
Type: "CERTIFICATE",
Bytes: certbytes,
}); err != nil {
return nil, err
}
rootCAs := x509.NewCertPool()
rootCAs.AppendCertsFromPEM(certbytes)
return &tls.Config{
RootCAs: rootCAs,
Certificates: []tls.Certificate{
{
Certificate: [][]byte{certbytes},
PrivateKey: l.links.core.secret,
},
},
InsecureSkipVerify: true,
MinVersion: tls.VersionTLS13,
}, nil
}
func (l *linkTLS) handler(name string, info linkInfo, conn net.Conn, options linkOptions, incoming bool) error {
return l.tcp.handler(name, info, conn, options, incoming)
}

98
src/core/link_unix.go Normal file
View File

@ -0,0 +1,98 @@
package core
import (
"context"
"fmt"
"net"
"net/url"
"time"
"github.com/Arceliar/phony"
)
type linkUNIX struct {
phony.Inbox
*links
dialer *net.Dialer
listener *net.ListenConfig
_listeners map[*Listener]context.CancelFunc
}
func (l *links) newLinkUNIX() *linkUNIX {
lt := &linkUNIX{
links: l,
dialer: &net.Dialer{
Timeout: time.Second * 5,
KeepAlive: -1,
},
listener: &net.ListenConfig{
KeepAlive: -1,
},
_listeners: map[*Listener]context.CancelFunc{},
}
return lt
}
func (l *linkUNIX) dial(url *url.URL, options linkOptions, _ string) error {
info := linkInfoFor("unix", "", url.Path)
if l.links.isConnectedTo(info) {
return fmt.Errorf("duplicate connection attempt")
}
addr, err := net.ResolveUnixAddr("unix", url.Path)
if err != nil {
return err
}
conn, err := l.dialer.DialContext(l.core.ctx, "unix", addr.String())
if err != nil {
return err
}
return l.handler(url.String(), info, conn, options, false)
}
func (l *linkUNIX) listen(url *url.URL, _ string) (*Listener, error) {
ctx, cancel := context.WithCancel(l.core.ctx)
listener, err := l.listener.Listen(ctx, "unix", url.Path)
if err != nil {
cancel()
return nil, err
}
entry := &Listener{
Listener: listener,
closed: make(chan struct{}),
}
phony.Block(l, func() {
l._listeners[entry] = cancel
})
l.core.log.Printf("UNIX listener started on %s", listener.Addr())
go func() {
defer phony.Block(l, func() {
delete(l._listeners, entry)
})
for {
conn, err := listener.Accept()
if err != nil {
cancel()
break
}
info := linkInfoFor("unix", "", url.String())
if err = l.handler(url.String(), info, conn, linkOptions{}, true); err != nil {
l.core.log.Errorln("Failed to create inbound link:", err)
}
}
listener.Close()
close(entry.closed)
l.core.log.Printf("UNIX listener stopped on %s", listener.Addr())
}()
return entry, nil
}
func (l *linkUNIX) handler(name string, info linkInfo, conn net.Conn, options linkOptions, incoming bool) error {
return l.links.create(
conn, // connection
name, // connection name
info, // connection info
incoming, // not incoming
false, // not forced
options, // connection options
)
}

8
src/core/options.go
View File

@ -14,10 +14,6 @@ func (c *Core) _applyOption(opt SetupOption) {
c.config.nodeinfo = v
case NodeInfoPrivacy:
c.config.nodeinfoPrivacy = v
case IfName:
c.config.ifname = v
case IfMTU:
c.config.ifmtu = v
case AllowedPublicKey:
pk := [32]byte{}
copy(pk[:], v)
@ -36,14 +32,10 @@ type Peer struct {
}
type NodeInfo map[string]interface{}
type NodeInfoPrivacy bool
type IfName string
type IfMTU uint16
type AllowedPublicKey ed25519.PublicKey
func (a ListenAddress) isSetupOption() {}
func (a Peer) isSetupOption() {}
func (a NodeInfo) isSetupOption() {}
func (a NodeInfoPrivacy) isSetupOption() {}
func (a IfName) isSetupOption() {}
func (a IfMTU) isSetupOption() {}
func (a AllowedPublicKey) isSetupOption() {}

417
src/core/tcp.go
View File

@ -1,417 +0,0 @@
package core
// This sends packets to peers using TCP as a transport
// It's generally better tested than the UDP implementation
// Using it regularly is insane, but I find TCP easier to test/debug with it
// Updating and optimizing the UDP version is a higher priority
// TODO:
// Something needs to make sure we're getting *valid* packets
// Could be used to DoS (connect, give someone else's keys, spew garbage)
// I guess the "peer" part should watch for link packets, disconnect?
// TCP connections start with a metadata exchange.
// It involves exchanging version numbers and crypto keys
// See version.go for version metadata format
import (
"context"
"fmt"
"math/rand"
"net"
"net/url"
"strings"
"sync"
"time"
"golang.org/x/net/proxy"
"github.com/yggdrasil-network/yggdrasil-go/src/address"
//"github.com/yggdrasil-network/yggdrasil-go/src/util"
)
const default_timeout = 6 * time.Second
// The TCP listener and information about active TCP connections, to avoid duplication.
type tcp struct {
links *links
waitgroup sync.WaitGroup
mutex sync.Mutex // Protecting the below
listeners map[string]*TcpListener
calls map[string]struct{}
conns map[linkInfo](chan struct{})
tls tcptls
}
// TcpListener is a stoppable TCP listener interface. These are typically
// returned from calls to the ListenTCP() function and are also used internally
// to represent listeners created by the "Listen" configuration option and for
// multicast interfaces.
type TcpListener struct {
Listener net.Listener
opts tcpOptions
stop chan struct{}
}
type TcpUpgrade struct {
upgrade func(c net.Conn, o *tcpOptions) (net.Conn, error)
name string
}
type tcpOptions struct {
linkOptions
upgrade *TcpUpgrade
socksProxyAddr string
socksProxyAuth *proxy.Auth
socksPeerAddr string
tlsSNI string
}
func (l *TcpListener) Stop() {
defer func() { _ = recover() }()
close(l.stop)
}
// Wrapper function to set additional options for specific connection types.
func (t *tcp) setExtraOptions(c net.Conn) {
switch sock := c.(type) {
case *net.TCPConn:
_ = sock.SetNoDelay(true)
// TODO something for socks5
default:
}
}
// Returns the address of the listener.
func (t *tcp) getAddr() *net.TCPAddr {
// TODO: Fix this, because this will currently only give a single address
// to multicast.go, which obviously is not great, but right now multicast.go
// doesn't have the ability to send more than one address in a packet either
t.mutex.Lock()
defer t.mutex.Unlock()
for _, l := range t.listeners {
return l.Listener.Addr().(*net.TCPAddr)
}
return nil
}
// Initializes the struct.
func (t *tcp) init(l *links, listeners []ListenAddress) error {
t.links = l
t.tls.init(t)
t.mutex.Lock()
t.calls = make(map[string]struct{})
t.conns = make(map[linkInfo](chan struct{}))
t.listeners = make(map[string]*TcpListener)
t.mutex.Unlock()
for _, listenaddr := range listeners {
u, err := url.Parse(string(listenaddr))
if err != nil {
t.links.core.log.Errorln("Failed to parse listener: listener", listenaddr, "is not correctly formatted, ignoring")
continue
}
if _, err := t.listenURL(u, ""); err != nil {
return err
}
}
return nil
}
func (t *tcp) stop() error {
t.mutex.Lock()
for _, listener := range t.listeners {
listener.Stop()
}
t.mutex.Unlock()
t.waitgroup.Wait()
return nil
}
func (t *tcp) listenURL(u *url.URL, sintf string) (*TcpListener, error) {
var listener *TcpListener
var err error
hostport := u.Host // Used for tcp and tls
if len(sintf) != 0 {
host, port, err := net.SplitHostPort(hostport)
if err == nil {
hostport = fmt.Sprintf("[%s%%%s]:%s", host, sintf, port)
}
}
switch u.Scheme {
case "tcp":
listener, err = t.listen(hostport, nil)
case "tls":
listener, err = t.listen(hostport, t.tls.forListener)
default:
t.links.core.log.Errorln("Failed to add listener: listener", u.String(), "is not correctly formatted, ignoring")
}
return listener, err
}
func (t *tcp) listen(listenaddr string, upgrade *TcpUpgrade) (*TcpListener, error) {
var err error
ctx := t.links.core.ctx
lc := net.ListenConfig{
Control: t.tcpContext,
}
listener, err := lc.Listen(ctx, "tcp", listenaddr)
if err == nil {
l := TcpListener{
Listener: listener,
opts: tcpOptions{upgrade: upgrade},
stop: make(chan struct{}),
}
t.waitgroup.Add(1)
go t.listener(&l, listenaddr)
return &l, nil
}
return nil, err
}
// Runs the listener, which spawns off goroutines for incoming connections.
func (t *tcp) listener(l *TcpListener, listenaddr string) {
defer t.waitgroup.Done()
if l == nil {
return
}
// Track the listener so that we can find it again in future
t.mutex.Lock()
if _, isIn := t.listeners[listenaddr]; isIn {
t.mutex.Unlock()
l.Listener.Close()
return
}
callproto := "TCP"
if l.opts.upgrade != nil {
callproto = strings.ToUpper(l.opts.upgrade.name)
}
t.listeners[listenaddr] = l
t.mutex.Unlock()
// And here we go!
defer func() {
t.links.core.log.Infoln("Stopping", callproto, "listener on:", l.Listener.Addr().String())
l.Listener.Close()
t.mutex.Lock()
delete(t.listeners, listenaddr)
t.mutex.Unlock()
}()
t.links.core.log.Infoln("Listening for", callproto, "on:", l.Listener.Addr().String())
go func() {
<-l.stop
l.Listener.Close()
}()
defer l.Stop()
for {
sock, err := l.Listener.Accept()
if err != nil {
t.links.core.log.Errorln("Failed to accept connection:", err)
select {
case <-l.stop:
return
default:
}
time.Sleep(time.Second) // So we don't busy loop
continue
}
t.waitgroup.Add(1)
options := l.opts
go t.handler(sock, true, options)
}
}
// Checks if we already are calling this address
func (t *tcp) startCalling(saddr string) bool {
t.mutex.Lock()
defer t.mutex.Unlock()
_, isIn := t.calls[saddr]
t.calls[saddr] = struct{}{}
return !isIn
}
// Checks if a connection already exists.
// If not, it adds it to the list of active outgoing calls (to block future attempts) and dials the address.
// If the dial is successful, it launches the handler.
// When finished, it removes the outgoing call, so reconnection attempts can be made later.
// This all happens in a separate goroutine that it spawns.
func (t *tcp) call(saddr string, options tcpOptions, sintf string) {
go func() {
callname := saddr
callproto := "TCP"
if options.upgrade != nil {
callproto = strings.ToUpper(options.upgrade.name)
}
if sintf != "" {
callname = fmt.Sprintf("%s/%s/%s", callproto, saddr, sintf)
}
if !t.startCalling(callname) {
return
}
defer func() {
// Block new calls for a little while, to mitigate livelock scenarios
rand.Seed(time.Now().UnixNano())
delay := default_timeout + time.Duration(rand.Intn(10000))*time.Millisecond
time.Sleep(delay)
t.mutex.Lock()
delete(t.calls, callname)
t.mutex.Unlock()
}()
var conn net.Conn
var err error
if options.socksProxyAddr != "" {
if sintf != "" {
return
}
dialerdst, er := net.ResolveTCPAddr("tcp", options.socksProxyAddr)
if er != nil {
return
}
var dialer proxy.Dialer
dialer, err = proxy.SOCKS5("tcp", dialerdst.String(), options.socksProxyAuth, proxy.Direct)
if err != nil {
return
}
ctx, done := context.WithTimeout(t.links.core.ctx, default_timeout)
conn, err = dialer.(proxy.ContextDialer).DialContext(ctx, "tcp", saddr)
done()
if err != nil {
return
}
t.waitgroup.Add(1)
options.socksPeerAddr = saddr
if ch := t.handler(conn, false, options); ch != nil {
<-ch
}
} else {
dst, err := net.ResolveTCPAddr("tcp", saddr)
if err != nil {
return
}
if dst.IP.IsLinkLocalUnicast() {
dst.Zone = sintf
if dst.Zone == "" {
return
}
}
dialer := net.Dialer{
Control: t.tcpContext,
}
if sintf != "" {
dialer.Control = t.getControl(sintf)
ief, err := net.InterfaceByName(sintf)
if err != nil {
return
}
if ief.Flags&net.FlagUp == 0 {
return
}
addrs, err := ief.Addrs()
if err == nil {
for addrindex, addr := range addrs {
src, _, err := net.ParseCIDR(addr.String())
if err != nil {
continue
}
if src.Equal(dst.IP) {
continue
}
if !src.IsGlobalUnicast() && !src.IsLinkLocalUnicast() {
continue
}
bothglobal := src.IsGlobalUnicast() == dst.IP.IsGlobalUnicast()
bothlinklocal := src.IsLinkLocalUnicast() == dst.IP.IsLinkLocalUnicast()
if !bothglobal && !bothlinklocal {
continue
}
if (src.To4() != nil) != (dst.IP.To4() != nil) {
continue
}
if bothglobal || bothlinklocal || addrindex == len(addrs)-1 {
dialer.LocalAddr = &net.TCPAddr{
IP: src,
Port: 0,
Zone: sintf,
}
break
}
}
if dialer.LocalAddr == nil {
return
}
}
}
ctx, done := context.WithTimeout(t.links.core.ctx, default_timeout)
conn, err = dialer.DialContext(ctx, "tcp", dst.String())
done()
if err != nil {
t.links.core.log.Debugf("Failed to dial %s: %s", callproto, err)
return
}
t.waitgroup.Add(1)
if ch := t.handler(conn, false, options); ch != nil {
<-ch
}
}
}()
}
func (t *tcp) handler(sock net.Conn, incoming bool, options tcpOptions) chan struct{} {
defer t.waitgroup.Done() // Happens after sock.close
defer sock.Close()
t.setExtraOptions(sock)
var upgraded bool
if options.upgrade != nil {
var err error
if sock, err = options.upgrade.upgrade(sock, &options); err != nil {
t.links.core.log.Errorln("TCP handler upgrade failed:", err)
return nil
}
upgraded = true
}
var name, proto, local, remote string
if options.socksProxyAddr != "" {
name = "socks://" + sock.RemoteAddr().String() + "/" + options.socksPeerAddr
proto = "socks"
local, _, _ = net.SplitHostPort(sock.LocalAddr().String())
remote, _, _ = net.SplitHostPort(options.socksPeerAddr)
} else {
if upgraded {
proto = options.upgrade.name
name = proto + "://" + sock.RemoteAddr().String()
} else {
proto = "tcp"
name = proto + "://" + sock.RemoteAddr().String()
}
local, _, _ = net.SplitHostPort(sock.LocalAddr().String())
remote, _, _ = net.SplitHostPort(sock.RemoteAddr().String())
}
localIP := net.ParseIP(local)
if localIP = localIP.To16(); localIP != nil {
var laddr address.Address
var lsubnet address.Subnet
copy(laddr[:], localIP)
copy(lsubnet[:], localIP)
if laddr.IsValid() || lsubnet.IsValid() {
// The local address is with the network address/prefix range
// This would route ygg over ygg, which we don't want
// FIXME ideally this check should happen outside of the core library
// Maybe dial/listen at the application level
// Then pass a net.Conn to the core library (after these kinds of checks are done)
t.links.core.log.Debugln("Dropping ygg-tunneled connection", local, remote)
return nil
}
}
force := net.ParseIP(strings.Split(remote, "%")[0]).IsLinkLocalUnicast()
link, err := t.links.create(sock, name, proto, local, remote, incoming, force, options.linkOptions)
if err != nil {
t.links.core.log.Println(err)
panic(err)
}
t.links.core.log.Debugln("DEBUG: starting handler for", name)
ch, err := link.handler()
t.links.core.log.Debugln("DEBUG: stopped handler for", name, err)
return ch
}

126
src/core/tls.go
View File

@ -1,126 +0,0 @@
package core
import (
"bytes"
"crypto/ed25519"
"crypto/rand"
"crypto/tls"
"crypto/x509"
"crypto/x509/pkix"
"encoding/hex"
"encoding/pem"
"errors"
"log"
"math/big"
"net"
"time"
)
type tcptls struct {
tcp *tcp
config *tls.Config
forDialer *TcpUpgrade
forListener *TcpUpgrade
}
func (t *tcptls) init(tcp *tcp) {
t.tcp = tcp
t.forDialer = &TcpUpgrade{
upgrade: t.upgradeDialer,
name: "tls",
}
t.forListener = &TcpUpgrade{
upgrade: t.upgradeListener,
name: "tls",
}
edpriv := make(ed25519.PrivateKey, ed25519.PrivateKeySize)
copy(edpriv[:], tcp.links.core.secret[:])
certBuf := &bytes.Buffer{}
// TODO: because NotAfter is finite, we should add some mechanism to regenerate the certificate and restart the listeners periodically for nodes with very high uptimes. Perhaps regenerate certs and restart listeners every few months or so.
pubtemp := x509.Certificate{
SerialNumber: big.NewInt(1),
Subject: pkix.Name{
CommonName: hex.EncodeToString(tcp.links.core.public[:]),
},
NotBefore: time.Now(),
NotAfter: time.Now().Add(time.Hour * 24 * 365),
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
BasicConstraintsValid: true,
}
derbytes, err := x509.CreateCertificate(rand.Reader, &pubtemp, &pubtemp, edpriv.Public(), edpriv)
if err != nil {
log.Fatalf("Failed to create certificate: %s", err)
}
if err := pem.Encode(certBuf, &pem.Block{Type: "CERTIFICATE", Bytes: derbytes}); err != nil {
panic("failed to encode certificate into PEM")
}
cpool := x509.NewCertPool()
cpool.AppendCertsFromPEM(derbytes)
t.config = &tls.Config{
RootCAs: cpool,
Certificates: []tls.Certificate{
{
Certificate: [][]byte{derbytes},
PrivateKey: edpriv,
},
},
InsecureSkipVerify: true,
MinVersion: tls.VersionTLS13,
}
}
func (t *tcptls) configForOptions(options *tcpOptions) *tls.Config {
config := t.config.Clone()
config.VerifyPeerCertificate = func(rawCerts [][]byte, _ [][]*x509.Certificate) error {
if len(rawCerts) != 1 {
return errors.New("tls not exactly 1 cert")
}
cert, err := x509.ParseCertificate(rawCerts[0])
if err != nil {
return errors.New("tls failed to parse cert")
}
if cert.PublicKeyAlgorithm != x509.Ed25519 {
return errors.New("tls wrong cert algorithm")
}
pk := cert.PublicKey.(ed25519.PublicKey)
var key keyArray
copy(key[:], pk)
// If options does not have a pinned key, then pin one now
if options.pinnedEd25519Keys == nil {
options.pinnedEd25519Keys = make(map[keyArray]struct{})
options.pinnedEd25519Keys[key] = struct{}{}
}
if _, isIn := options.pinnedEd25519Keys[key]; !isIn {
return errors.New("tls key does not match pinned key")
}
return nil
}
return config
}
func (t *tcptls) upgradeListener(c net.Conn, options *tcpOptions) (net.Conn, error) {
config := t.configForOptions(options)
conn := tls.Server(c, config)
if err := conn.Handshake(); err != nil {
return c, err
}
return conn, nil
}
func (t *tcptls) upgradeDialer(c net.Conn, options *tcpOptions) (net.Conn, error) {
config := t.configForOptions(options)
config.ServerName = options.tlsSNI
conn := tls.Client(c, config)
if err := conn.Handshake(); err != nil {
return c, err
}
return conn, nil
}

4
src/multicast/multicast.go
View File

@ -45,7 +45,7 @@ type interfaceInfo struct {
}
type listenerInfo struct {
listener *core.TcpListener
listener *core.Listener
time time.Time
interval time.Duration
port uint16
@ -219,7 +219,7 @@ func (m *Multicast) _announce() {
for name, info := range m._listeners {
// Prepare our stop function!
stop := func() {
info.listener.Stop()
info.listener.Close()
delete(m._listeners, name)
m.log.Debugln("No longer multicasting on", name)
}