func (beacon *Beacon) keepAlive(conn ssh.Conn) (<-chan error, chan<- struct{}) {
logger := beacon.Logger.Session("keepalive")
errs := make(chan error, 1)
kas := time.NewTicker(5 * time.Second)
cancel := make(chan struct{})
go func() {
for {
// ignore reply; server may just not have handled it, since there's no
// standard keepalive request name
_, _, err := conn.SendRequest("keepalive", true, []byte("sup"))
if err != nil {
logger.Error("failed", err)
errs <- err
return
}
logger.Debug("ok")
select {
case <-kas.C:
case <-cancel:
errs <- nil
return
}
}
}()
return errs, cancel
}
func keepalive(conn ssh.Conn, ticker *time.Ticker, stopCh chan struct{}) {
for {
select {
case <-ticker.C:
_, _, _ = conn.SendRequest("*****@*****.**", true, nil)
case <-stopCh:
ticker.Stop()
return
}
}
}
/* handleConnRequests handles proxying requests read from reqs to the SSH
connection sc. info is used for logging */
func handleConnRequests(
reqs <-chan *ssh.Request,
c ssh.Conn,
info string,
) {
for r := range reqs {
go handleRequest(
r,
func(
name string,
wantReply bool,
payload []byte,
) (bool, []byte, error) {
return c.SendRequest(name, wantReply, payload)
},
func() error { return c.Close() },
info,
)
}
}
func ProxyGlobalRequests(logger lager.Logger, conn ssh.Conn, reqs <-chan *ssh.Request) {
logger = logger.Session("proxy-global-requests")
logger.Info("started")
defer logger.Info("completed")
for req := range reqs {
logger.Info("request", lager.Data{
"type": req.Type,
"wantReply": req.WantReply,
"payload": req.Payload,
})
success, reply, err := conn.SendRequest(req.Type, req.WantReply, req.Payload)
if err != nil {
logger.Error("send-request-failed", err)
continue
}
if req.WantReply {
req.Reply(success, reply)
}
}
}