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Merge pull request #48276 from pmichali/issue48225

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Automatic merge from submit-queue (batch tested with PRs 48812, 48276)

client-go support IPv6 addresses for PortForwarder getListener()

Currently, client-go requires that an IPv6 address string for hostname has
square brackets surrounding, so that it can be used with address:port in
an API request.

This change, removes that requirement, and has getListener() add the
square brackets, if needed. If the hostname is a name, an IPv4 address
string, or an IPv6 address already with square brackets, no change is made.

Decided to change here, rather than everywhere client-go is used (thinking
that there may be places where we DON'T want the square brackets applied).

This issue was found in kubelet, which, at startup, creates a listener for
services and nodes. If an IPv6 address is used, the URI was malformed.



**What this PR does / why we need it**:
Ensures that client-go will handle IPv6 addresses as hostnames, without any special encoding by caller.

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #48225 

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```
This commit is contained in:
Kubernetes Submit Queue 2017-07-14 04:43:44 -07:00 committed by GitHub
commit a3ff0eaf69
2 changed files with 4 additions and 10 deletions
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2
staging/src/k8s.io/client-go/tools/portforward/portforward.go
View File

@ -207,7 +207,7 @@ func (pf *PortForwarder) listenOnPortAndAddress(port *ForwardedPort, protocol st
// getListener creates a listener on the interface targeted by the given hostname on the given port with
// the given protocol. protocol is in net.Listen style which basically admits values like tcp, tcp4, tcp6
func (pf *PortForwarder) getListener(protocol string, hostname string, port *ForwardedPort) (net.Listener, error) {
listener, err := net.Listen(protocol, fmt.Sprintf("%s:%d", hostname, port.Local))
listener, err := net.Listen(protocol, net.JoinHostPort(hostname, strconv.Itoa(int(port.Local))))
if err != nil {
return nil, fmt.Errorf("Unable to create listener: Error %s", err)
}

12
staging/src/k8s.io/client-go/tools/portforward/portforward_test.go
View File

@ -134,13 +134,13 @@ func TestGetListener(t *testing.T) {
ExpectedListenerAddress: "127.0.0.1",
},
{
Hostname: "[::1]",
Hostname: "::1",
Protocol: "tcp6",
ShouldRaiseError: false,
ExpectedListenerAddress: "::1",
},
{
Hostname: "[::1]",
Hostname: "::1",
Protocol: "tcp4",
ShouldRaiseError: true,
},
@ -149,12 +149,6 @@ func TestGetListener(t *testing.T) {
Protocol: "tcp6",
ShouldRaiseError: true,
},
{
// IPv6 address must be put into brackets. This test reveals this.
Hostname: "::1",
Protocol: "tcp6",
ShouldRaiseError: true,
},
}
for i, testCase := range testCases {
@ -182,7 +176,7 @@ func TestGetListener(t *testing.T) {
host, port, _ := net.SplitHostPort(listener.Addr().String())
t.Logf("Asked a %s forward for: %s:%v, got listener %s:%s, expected: %s", testCase.Protocol, testCase.Hostname, 12345, host, port, expectedListenerPort)
if host != testCase.ExpectedListenerAddress {
t.Errorf("Test case #%d failed: Listener does not listen on exepected address: asked %v got %v", i, testCase.ExpectedListenerAddress, host)
t.Errorf("Test case #%d failed: Listener does not listen on expected address: asked '%v' got '%v'", i, testCase.ExpectedListenerAddress, host)
}
if port != expectedListenerPort {
t.Errorf("Test case #%d failed: Listener does not listen on exepected port: asked %v got %v", i, expectedListenerPort, port)