yggdrasil-network/yggdrasil-go
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Redial failed connections if possible (#983)

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Neil Alexander 2022-11-12 11:30:03 +00:00 • committed by GitHub
parent 0da871f528
commit 7efd66932f
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9 changed files with 124 additions and 28 deletions
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4
src/core/api.go
View file

@ -194,7 +194,7 @@ func (c *Core) AddPeer(uri string, sourceInterface string) error {
if err != nil {
return err
}
info, err := c.links.call(u, sourceInterface)
info, err := c.links.call(u, sourceInterface, nil)
if err != nil {
return err
}
@ -236,7 +236,7 @@ func (c *Core) RemovePeer(uri string, sourceInterface string) error {
// This does not add the peer to the peer list, so if the connection drops, the
// peer will not be called again automatically.
func (c *Core) CallPeer(u *url.URL, sintf string) error {
_, err := c.links.call(u, sintf)
_, err := c.links.call(u, sintf, nil)
return err
}

7
src/core/core.go
View file

@ -121,6 +121,13 @@ func (c *Core) _addPeerLoop() {
})
}
func (c *Core) RetryPeersNow() {
if c.addPeerTimer != nil && !c.addPeerTimer.Stop() {
<-c.addPeerTimer.C
}
c.Act(nil, c._addPeerLoop)
}
// Stop shuts down the Yggdrasil node.
func (c *Core) Stop() {
phony.Block(c, func() {

67
src/core/link.go
View file

@ -34,6 +34,11 @@ type linkInfo struct {
remote string // Remote name or address
}
type linkDial struct {
url *url.URL
sintf string
}
type link struct {
lname string
links *links
@ -105,9 +110,10 @@ func (l *links) isConnectedTo(info linkInfo) bool {
return isConnected
}
func (l *links) call(u *url.URL, sintf string) (linkInfo, error) {
info := linkInfoFor(u.Scheme, sintf, u.Host)
func (l *links) call(u *url.URL, sintf string, errch chan<- error) (info linkInfo, err error) {
info = linkInfoFor(u.Scheme, sintf, u.Host)
if l.isConnectedTo(info) {
close(errch) // already connected, no error
return info, nil
}
options := linkOptions{
@ -116,6 +122,7 @@ func (l *links) call(u *url.URL, sintf string) (linkInfo, error) {
for _, pubkey := range u.Query()["key"] {
sigPub, err := hex.DecodeString(pubkey)
if err != nil {
close(errch)
return info, fmt.Errorf("pinned key contains invalid hex characters")
}
var sigPubKey keyArray
@ -125,6 +132,7 @@ func (l *links) call(u *url.URL, sintf string) (linkInfo, error) {
if p := u.Query().Get("priority"); p != "" {
pi, err := strconv.ParseUint(p, 10, 8)
if err != nil {
close(errch)
return info, fmt.Errorf("priority invalid: %w", err)
}
options.priority = uint8(pi)
@ -132,15 +140,27 @@ func (l *links) call(u *url.URL, sintf string) (linkInfo, error) {
switch info.linkType {
case "tcp":
go func() {
if errch != nil {
defer close(errch)
}
if err := l.tcp.dial(u, options, sintf); err != nil && err != io.EOF {
l.core.log.Warnf("Failed to dial TCP %s: %s\n", u.Host, err)
if errch != nil {
errch <- err
}
}
}()
case "socks":
go func() {
if errch != nil {
defer close(errch)
}
if err := l.socks.dial(u, options); err != nil && err != io.EOF {
l.core.log.Warnf("Failed to dial SOCKS %s: %s\n", u.Host, err)
if errch != nil {
errch <- err
}
}
}()
@ -163,19 +183,32 @@ func (l *links) call(u *url.URL, sintf string) (linkInfo, error) {
}
}
go func() {
if errch != nil {
defer close(errch)
}
if err := l.tls.dial(u, options, sintf, tlsSNI); err != nil && err != io.EOF {
l.core.log.Warnf("Failed to dial TLS %s: %s\n", u.Host, err)
if errch != nil {
errch <- err
}
}
}()
case "unix":
go func() {
if errch != nil {
defer close(errch)
}
if err := l.unix.dial(u, options, sintf); err != nil && err != io.EOF {
l.core.log.Warnf("Failed to dial UNIX %s: %s\n", u.Host, err)
if errch != nil {
errch <- err
}
}
}()
default:
close(errch)
return info, errors.New("unknown call scheme: " + u.Scheme)
}
return info, nil
@ -197,7 +230,7 @@ func (l *links) listen(u *url.URL, sintf string) (*Listener, error) {
return listener, err
}
func (l *links) create(conn net.Conn, name string, info linkInfo, incoming, force bool, options linkOptions) error {
func (l *links) create(conn net.Conn, dial *linkDial, name string, info linkInfo, incoming, force bool, options linkOptions) error {
intf := link{
conn: &linkConn{
Conn: conn,
@ -211,14 +244,14 @@ func (l *links) create(conn net.Conn, name string, info linkInfo, incoming, forc
force: force,
}
go func() {
if err := intf.handler(); err != nil {
if err := intf.handler(dial); err != nil {
l.core.log.Errorf("Link handler %s error (%s): %s", name, conn.RemoteAddr(), err)
}
}()
return nil
}
func (intf *link) handler() error {
func (intf *link) handler(dial *linkDial) error {
defer intf.conn.Close() // nolint:errcheck
// Don't connect to this link more than once.
@ -321,6 +354,30 @@ func (intf *link) handler() error {
intf.links.core.log.Infof("Disconnected %s %s: %s, source %s; error: %s",
dir, strings.ToUpper(intf.info.linkType), remoteStr, localStr, err)
}
if !intf.incoming && dial != nil {
// The connection was one that we dialled, so wait a second and try to
// dial it again.
var retry func(attempt int)
retry = func(attempt int) {
// intf.links.core.log.Infof("Retrying %s (attempt %d of 5)...", dial.url.String(), attempt)
errch := make(chan error, 1)
if _, err := intf.links.call(dial.url, dial.sintf, errch); err != nil {
return
}
if err := <-errch; err != nil {
if attempt < 3 {
time.AfterFunc(time.Second, func() {
retry(attempt + 1)
})
}
}
}
time.AfterFunc(time.Second, func() {
retry(1)
})
}
return nil
}

20
src/core/link_socks.go
View file

@ -37,16 +37,20 @@ func (l *linkSOCKS) dial(url *url.URL, options linkOptions) error {
if err != nil {
return err
}
return l.handler(url.String(), info, conn, options, false)
dial := &linkDial{
url: url,
}
return l.handler(dial, info, conn, options, false)
}
func (l *linkSOCKS) handler(name string, info linkInfo, conn net.Conn, options linkOptions, incoming bool) error {
func (l *linkSOCKS) handler(dial *linkDial, 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
conn, // connection
dial, // connection URL
dial.url.String(), // connection name
info, // connection info
incoming, // not incoming
false, // not forced
options, // connection options
)
}

13
src/core/link_tcp.go
View file

@ -47,8 +47,12 @@ func (l *linkTCP) dial(url *url.URL, options linkOptions, sintf string) error {
if err != nil {
return err
}
uri := strings.TrimRight(strings.SplitN(url.String(), "?", 2)[0], "/")
return l.handler(uri, info, conn, options, false, false)
name := strings.TrimRight(strings.SplitN(url.String(), "?", 2)[0], "/")
dial := &linkDial{
url: url,
sintf: sintf,
}
return l.handler(dial, name, info, conn, options, false, false)
}
func (l *linkTCP) listen(url *url.URL, sintf string) (*Listener, error) {
@ -86,7 +90,7 @@ func (l *linkTCP) listen(url *url.URL, sintf string) (*Listener, error) {
raddr := conn.RemoteAddr().(*net.TCPAddr)
name := fmt.Sprintf("tcp://%s", raddr)
info := linkInfoFor("tcp", sintf, tcpIDFor(laddr, raddr))
if err = l.handler(name, info, conn, linkOptionsForListener(url), true, raddr.IP.IsLinkLocalUnicast()); err != nil {
if err = l.handler(nil, name, info, conn, linkOptionsForListener(url), true, raddr.IP.IsLinkLocalUnicast()); err != nil {
l.core.log.Errorln("Failed to create inbound link:", err)
}
}
@ -97,9 +101,10 @@ func (l *linkTCP) listen(url *url.URL, sintf string) (*Listener, error) {
return entry, nil
}
func (l *linkTCP) handler(name string, info linkInfo, conn net.Conn, options linkOptions, incoming, force bool) error {
func (l *linkTCP) handler(dial *linkDial, name string, info linkInfo, conn net.Conn, options linkOptions, incoming, force bool) error {
return l.links.create(
conn, // connection
dial, // connection URL
name, // connection name
info, // connection info
incoming, // not incoming

14
src/core/link_tls.go
View file

@ -69,8 +69,12 @@ func (l *linkTLS) dial(url *url.URL, options linkOptions, sintf, sni string) err
if err != nil {
return err
}
uri := strings.TrimRight(strings.SplitN(url.String(), "?", 2)[0], "/")
return l.handler(uri, info, conn, options, false, false)
name := strings.TrimRight(strings.SplitN(url.String(), "?", 2)[0], "/")
dial := &linkDial{
url: url,
sintf: sintf,
}
return l.handler(dial, name, info, conn, options, false, false)
}
func (l *linkTLS) listen(url *url.URL, sintf string) (*Listener, error) {
@ -109,7 +113,7 @@ func (l *linkTLS) listen(url *url.URL, sintf string) (*Listener, error) {
raddr := conn.RemoteAddr().(*net.TCPAddr)
name := fmt.Sprintf("tls://%s", raddr)
info := linkInfoFor("tls", sintf, tcpIDFor(laddr, raddr))
if err = l.handler(name, info, conn, linkOptionsForListener(url), true, raddr.IP.IsLinkLocalUnicast()); err != nil {
if err = l.handler(nil, name, info, conn, linkOptionsForListener(url), true, raddr.IP.IsLinkLocalUnicast()); err != nil {
l.core.log.Errorln("Failed to create inbound link:", err)
}
}
@ -165,6 +169,6 @@ func (l *linkTLS) generateConfig() (*tls.Config, error) {
}, nil
}
func (l *linkTLS) handler(name string, info linkInfo, conn net.Conn, options linkOptions, incoming, force bool) error {
return l.tcp.handler(name, info, conn, options, incoming, force)
func (l *linkTLS) handler(dial *linkDial, name string, info linkInfo, conn net.Conn, options linkOptions, incoming, force bool) error {
return l.tcp.handler(dial, name, info, conn, options, incoming, force)
}

10
src/core/link_unix.go
View file

@ -45,7 +45,10 @@ func (l *linkUNIX) dial(url *url.URL, options linkOptions, _ string) error {
if err != nil {
return err
}
return l.handler(url.String(), info, conn, options, false)
dial := &linkDial{
url: url,
}
return l.handler(dial, url.String(), info, conn, options, false)
}
func (l *linkUNIX) listen(url *url.URL, _ string) (*Listener, error) {
@ -74,7 +77,7 @@ func (l *linkUNIX) listen(url *url.URL, _ string) (*Listener, error) {
break
}
info := linkInfoFor("unix", "", url.String())
if err = l.handler(url.String(), info, conn, linkOptionsForListener(url), true); err != nil {
if err = l.handler(nil, url.String(), info, conn, linkOptionsForListener(url), true); err != nil {
l.core.log.Errorln("Failed to create inbound link:", err)
}
}
@ -85,9 +88,10 @@ func (l *linkUNIX) listen(url *url.URL, _ string) (*Listener, error) {
return entry, nil
}
func (l *linkUNIX) handler(name string, info linkInfo, conn net.Conn, options linkOptions, incoming bool) error {
func (l *linkUNIX) handler(dial *linkDial, name string, info linkInfo, conn net.Conn, options linkOptions, incoming bool) error {
return l.links.create(
conn, // connection
dial, // connection URL
name, // connection name
info, // connection info
incoming, // not incoming