X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/a7da936b6106bff17a7830124b1fd87ff01ad91e..0020a0bc96ee13203fbdc2af28ffa077799213d0:/lib/dispatchcloud/ssh_executor/executor.go

diff --git a/lib/dispatchcloud/ssh_executor/executor.go b/lib/dispatchcloud/ssh_executor/executor.go
index 4b2478e940..d608763cf5 100644
--- a/lib/dispatchcloud/ssh_executor/executor.go
+++ b/lib/dispatchcloud/ssh_executor/executor.go
@@ -36,9 +36,11 @@ func New(t cloud.ExecutorTarget) *Executor {
 //
 // An Executor must not be copied.
 type Executor struct {
-	target  cloud.ExecutorTarget
-	signers []ssh.Signer
-	mtx     sync.RWMutex // controls access to instance after creation
+	target     cloud.ExecutorTarget
+	targetPort string
+	targetUser string
+	signers    []ssh.Signer
+	mtx        sync.RWMutex // controls access to instance after creation
 
 	client      *ssh.Client
 	clientErr   error
@@ -67,6 +69,17 @@ func (exr *Executor) SetTarget(t cloud.ExecutorTarget) {
 	exr.target = t
 }
 
+// SetTargetPort sets the default port (name or number) to connect
+// to. This is used only when the address returned by the target's
+// Address() method does not specify a port. If the given port is
+// empty (or SetTargetPort is not called at all), the default port is
+// "ssh".
+func (exr *Executor) SetTargetPort(port string) {
+	exr.mtx.Lock()
+	defer exr.mtx.Unlock()
+	exr.targetPort = port
+}
+
 // Target returns the current target.
 func (exr *Executor) Target() cloud.ExecutorTarget {
 	exr.mtx.RLock()
@@ -160,16 +173,34 @@ func (exr *Executor) sshClient(create bool) (*ssh.Client, error) {
 	return exr.client, exr.clientErr
 }
 
+func (exr *Executor) TargetHostPort() (string, string) {
+	addr := exr.Target().Address()
+	if addr == "" {
+		return "", ""
+	}
+	h, p, err := net.SplitHostPort(addr)
+	if err != nil || p == "" {
+		// Target address does not specify a port.  Use
+		// targetPort, or "ssh".
+		if h == "" {
+			h = addr
+		}
+		if p = exr.targetPort; p == "" {
+			p = "ssh"
+		}
+	}
+	return h, p
+}
+
 // Create a new SSH client.
 func (exr *Executor) setupSSHClient() (*ssh.Client, error) {
-	target := exr.Target()
-	addr := target.Address()
-	if addr == "" {
+	addr := net.JoinHostPort(exr.TargetHostPort())
+	if addr == ":" {
 		return nil, errors.New("instance has no address")
 	}
 	var receivedKey ssh.PublicKey
 	client, err := ssh.Dial("tcp", addr, &ssh.ClientConfig{
-		User: "root",
+		User: exr.Target().RemoteUser(),
 		Auth: []ssh.AuthMethod{
 			ssh.PublicKeys(exr.signers...),
 		},
@@ -186,7 +217,7 @@ func (exr *Executor) setupSSHClient() (*ssh.Client, error) {
 	}
 
 	if exr.hostKey == nil || !bytes.Equal(exr.hostKey.Marshal(), receivedKey.Marshal()) {
-		err = target.VerifyHostKey(receivedKey, client)
+		err = exr.Target().VerifyHostKey(receivedKey, client)
 		if err != nil {
 			return nil, err
 		}