Check in the vendor directory

Travis seems to be having issues pulling deps, so we'll have to check in
the vendor directory and prevent the makefile from trying to regenerate
it normally.

vendor/k8s.io/apimachinery/pkg/util/net/http.go

@@ -0,0 +1,426 @@
+/*
+Copyright 2016 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package net
+
+import (
+	"bufio"
+	"bytes"
+	"context"
+	"crypto/tls"
+	"fmt"
+	"io"
+	"net"
+	"net/http"
+	"net/url"
+	"os"
+	"path"
+	"strconv"
+	"strings"
+
+	"github.com/golang/glog"
+	"golang.org/x/net/http2"
+)
+
+// JoinPreservingTrailingSlash does a path.Join of the specified elements,
+// preserving any trailing slash on the last non-empty segment
+func JoinPreservingTrailingSlash(elem ...string) string {
+	// do the basic path join
+	result := path.Join(elem...)
+
+	// find the last non-empty segment
+	for i := len(elem) - 1; i >= 0; i-- {
+		if len(elem[i]) > 0 {
+			// if the last segment ended in a slash, ensure our result does as well
+			if strings.HasSuffix(elem[i], "/") && !strings.HasSuffix(result, "/") {
+				result += "/"
+			}
+			break
+		}
+	}
+
+	return result
+}
+
+// IsProbableEOF returns true if the given error resembles a connection termination
+// scenario that would justify assuming that the watch is empty.
+// These errors are what the Go http stack returns back to us which are general
+// connection closure errors (strongly correlated) and callers that need to
+// differentiate probable errors in connection behavior between normal "this is
+// disconnected" should use the method.
+func IsProbableEOF(err error) bool {
+	if err == nil {
+		return false
+	}
+	if uerr, ok := err.(*url.Error); ok {
+		err = uerr.Err
+	}
+	switch {
+	case err == io.EOF:
+		return true
+	case err.Error() == "http: can't write HTTP request on broken connection":
+		return true
+	case strings.Contains(err.Error(), "connection reset by peer"):
+		return true
+	case strings.Contains(strings.ToLower(err.Error()), "use of closed network connection"):
+		return true
+	}
+	return false
+}
+
+var defaultTransport = http.DefaultTransport.(*http.Transport)
+
+// SetOldTransportDefaults applies the defaults from http.DefaultTransport
+// for the Proxy, Dial, and TLSHandshakeTimeout fields if unset
+func SetOldTransportDefaults(t *http.Transport) *http.Transport {
+	if t.Proxy == nil || isDefault(t.Proxy) {
+		// http.ProxyFromEnvironment doesn't respect CIDRs and that makes it impossible to exclude things like pod and service IPs from proxy settings
+		// ProxierWithNoProxyCIDR allows CIDR rules in NO_PROXY
+		t.Proxy = NewProxierWithNoProxyCIDR(http.ProxyFromEnvironment)
+	}
+	if t.DialContext == nil {
+		t.DialContext = defaultTransport.DialContext
+	}
+	if t.TLSHandshakeTimeout == 0 {
+		t.TLSHandshakeTimeout = defaultTransport.TLSHandshakeTimeout
+	}
+	return t
+}
+
+// SetTransportDefaults applies the defaults from http.DefaultTransport
+// for the Proxy, Dial, and TLSHandshakeTimeout fields if unset
+func SetTransportDefaults(t *http.Transport) *http.Transport {
+	t = SetOldTransportDefaults(t)
+	// Allow clients to disable http2 if needed.
+	if s := os.Getenv("DISABLE_HTTP2"); len(s) > 0 {
+		glog.Infof("HTTP2 has been explicitly disabled")
+	} else {
+		if err := http2.ConfigureTransport(t); err != nil {
+			glog.Warningf("Transport failed http2 configuration: %v", err)
+		}
+	}
+	return t
+}
+
+type RoundTripperWrapper interface {
+	http.RoundTripper
+	WrappedRoundTripper() http.RoundTripper
+}
+
+type DialFunc func(ctx context.Context, net, addr string) (net.Conn, error)
+
+func DialerFor(transport http.RoundTripper) (DialFunc, error) {
+	if transport == nil {
+		return nil, nil
+	}
+
+	switch transport := transport.(type) {
+	case *http.Transport:
+		return transport.DialContext, nil
+	case RoundTripperWrapper:
+		return DialerFor(transport.WrappedRoundTripper())
+	default:
+		return nil, fmt.Errorf("unknown transport type: %T", transport)
+	}
+}
+
+type TLSClientConfigHolder interface {
+	TLSClientConfig() *tls.Config
+}
+
+func TLSClientConfig(transport http.RoundTripper) (*tls.Config, error) {
+	if transport == nil {
+		return nil, nil
+	}
+
+	switch transport := transport.(type) {
+	case *http.Transport:
+		return transport.TLSClientConfig, nil
+	case TLSClientConfigHolder:
+		return transport.TLSClientConfig(), nil
+	case RoundTripperWrapper:
+		return TLSClientConfig(transport.WrappedRoundTripper())
+	default:
+		return nil, fmt.Errorf("unknown transport type: %T", transport)
+	}
+}
+
+func FormatURL(scheme string, host string, port int, path string) *url.URL {
+	return &url.URL{
+		Scheme: scheme,
+		Host:   net.JoinHostPort(host, strconv.Itoa(port)),
+		Path:   path,
+	}
+}
+
+func GetHTTPClient(req *http.Request) string {
+	if userAgent, ok := req.Header["User-Agent"]; ok {
+		if len(userAgent) > 0 {
+			return userAgent[0]
+		}
+	}
+	return "unknown"
+}
+
+// SourceIPs splits the comma separated X-Forwarded-For header or returns the X-Real-Ip header or req.RemoteAddr,
+// in that order, ignoring invalid IPs. It returns nil if all of these are empty or invalid.
+func SourceIPs(req *http.Request) []net.IP {
+	hdr := req.Header
+	// First check the X-Forwarded-For header for requests via proxy.
+	hdrForwardedFor := hdr.Get("X-Forwarded-For")
+	forwardedForIPs := []net.IP{}
+	if hdrForwardedFor != "" {
+		// X-Forwarded-For can be a csv of IPs in case of multiple proxies.
+		// Use the first valid one.
+		parts := strings.Split(hdrForwardedFor, ",")
+		for _, part := range parts {
+			ip := net.ParseIP(strings.TrimSpace(part))
+			if ip != nil {
+				forwardedForIPs = append(forwardedForIPs, ip)
+			}
+		}
+	}
+	if len(forwardedForIPs) > 0 {
+		return forwardedForIPs
+	}
+
+	// Try the X-Real-Ip header.
+	hdrRealIp := hdr.Get("X-Real-Ip")
+	if hdrRealIp != "" {
+		ip := net.ParseIP(hdrRealIp)
+		if ip != nil {
+			return []net.IP{ip}
+		}
+	}
+
+	// Fallback to Remote Address in request, which will give the correct client IP when there is no proxy.
+	// Remote Address in Go's HTTP server is in the form host:port so we need to split that first.
+	host, _, err := net.SplitHostPort(req.RemoteAddr)
+	if err == nil {
+		if remoteIP := net.ParseIP(host); remoteIP != nil {
+			return []net.IP{remoteIP}
+		}
+	}
+
+	// Fallback if Remote Address was just IP.
+	if remoteIP := net.ParseIP(req.RemoteAddr); remoteIP != nil {
+		return []net.IP{remoteIP}
+	}
+
+	return nil
+}
+
+// Extracts and returns the clients IP from the given request.
+// Looks at X-Forwarded-For header, X-Real-Ip header and request.RemoteAddr in that order.
+// Returns nil if none of them are set or is set to an invalid value.
+func GetClientIP(req *http.Request) net.IP {
+	ips := SourceIPs(req)
+	if len(ips) == 0 {
+		return nil
+	}
+	return ips[0]
+}
+
+// Prepares the X-Forwarded-For header for another forwarding hop by appending the previous sender's
+// IP address to the X-Forwarded-For chain.
+func AppendForwardedForHeader(req *http.Request) {
+	// Copied from net/http/httputil/reverseproxy.go:
+	if clientIP, _, err := net.SplitHostPort(req.RemoteAddr); err == nil {
+		// If we aren't the first proxy retain prior
+		// X-Forwarded-For information as a comma+space
+		// separated list and fold multiple headers into one.
+		if prior, ok := req.Header["X-Forwarded-For"]; ok {
+			clientIP = strings.Join(prior, ", ") + ", " + clientIP
+		}
+		req.Header.Set("X-Forwarded-For", clientIP)
+	}
+}
+
+var defaultProxyFuncPointer = fmt.Sprintf("%p", http.ProxyFromEnvironment)
+
+// isDefault checks to see if the transportProxierFunc is pointing to the default one
+func isDefault(transportProxier func(*http.Request) (*url.URL, error)) bool {
+	transportProxierPointer := fmt.Sprintf("%p", transportProxier)
+	return transportProxierPointer == defaultProxyFuncPointer
+}
+
+// NewProxierWithNoProxyCIDR constructs a Proxier function that respects CIDRs in NO_PROXY and delegates if
+// no matching CIDRs are found
+func NewProxierWithNoProxyCIDR(delegate func(req *http.Request) (*url.URL, error)) func(req *http.Request) (*url.URL, error) {
+	// we wrap the default method, so we only need to perform our check if the NO_PROXY (or no_proxy) envvar has a CIDR in it
+	noProxyEnv := os.Getenv("NO_PROXY")
+	if noProxyEnv == "" {
+		noProxyEnv = os.Getenv("no_proxy")
+	}
+	noProxyRules := strings.Split(noProxyEnv, ",")
+
+	cidrs := []*net.IPNet{}
+	for _, noProxyRule := range noProxyRules {
+		_, cidr, _ := net.ParseCIDR(noProxyRule)
+		if cidr != nil {
+			cidrs = append(cidrs, cidr)
+		}
+	}
+
+	if len(cidrs) == 0 {
+		return delegate
+	}
+
+	return func(req *http.Request) (*url.URL, error) {
+		ip := net.ParseIP(req.URL.Hostname())
+		if ip == nil {
+			return delegate(req)
+		}
+
+		for _, cidr := range cidrs {
+			if cidr.Contains(ip) {
+				return nil, nil
+			}
+		}
+
+		return delegate(req)
+	}
+}
+
+// DialerFunc implements Dialer for the provided function.
+type DialerFunc func(req *http.Request) (net.Conn, error)
+
+func (fn DialerFunc) Dial(req *http.Request) (net.Conn, error) {
+	return fn(req)
+}
+
+// Dialer dials a host and writes a request to it.
+type Dialer interface {
+	// Dial connects to the host specified by req's URL, writes the request to the connection, and
+	// returns the opened net.Conn.
+	Dial(req *http.Request) (net.Conn, error)
+}
+
+// ConnectWithRedirects uses dialer to send req, following up to 10 redirects (relative to
+// originalLocation). It returns the opened net.Conn and the raw response bytes.
+func ConnectWithRedirects(originalMethod string, originalLocation *url.URL, header http.Header, originalBody io.Reader, dialer Dialer) (net.Conn, []byte, error) {
+	const (
+		maxRedirects    = 10
+		maxResponseSize = 16384 // play it safe to allow the potential for lots of / large headers
+	)
+
+	var (
+		location         = originalLocation
+		method           = originalMethod
+		intermediateConn net.Conn
+		rawResponse      = bytes.NewBuffer(make([]byte, 0, 256))
+		body             = originalBody
+	)
+
+	defer func() {
+		if intermediateConn != nil {
+			intermediateConn.Close()
+		}
+	}()
+
+redirectLoop:
+	for redirects := 0; ; redirects++ {
+		if redirects > maxRedirects {
+			return nil, nil, fmt.Errorf("too many redirects (%d)", redirects)
+		}
+
+		req, err := http.NewRequest(method, location.String(), body)
+		if err != nil {
+			return nil, nil, err
+		}
+
+		req.Header = header
+
+		intermediateConn, err = dialer.Dial(req)
+		if err != nil {
+			return nil, nil, err
+		}
+
+		// Peek at the backend response.
+		rawResponse.Reset()
+		respReader := bufio.NewReader(io.TeeReader(
+			io.LimitReader(intermediateConn, maxResponseSize), // Don't read more than maxResponseSize bytes.
+			rawResponse)) // Save the raw response.
+		resp, err := http.ReadResponse(respReader, nil)
+		if err != nil {
+			// Unable to read the backend response; let the client handle it.
+			glog.Warningf("Error reading backend response: %v", err)
+			break redirectLoop
+		}
+
+		switch resp.StatusCode {
+		case http.StatusFound:
+			// Redirect, continue.
+		default:
+			// Don't redirect.
+			break redirectLoop
+		}
+
+		// Redirected requests switch to "GET" according to the HTTP spec:
+		// https://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.3
+		method = "GET"
+		// don't send a body when following redirects
+		body = nil
+
+		resp.Body.Close() // not used
+
+		// Reset the connection.
+		intermediateConn.Close()
+		intermediateConn = nil
+
+		// Prepare to follow the redirect.
+		redirectStr := resp.Header.Get("Location")
+		if redirectStr == "" {
+			return nil, nil, fmt.Errorf("%d response missing Location header", resp.StatusCode)
+		}
+		// We have to parse relative to the current location, NOT originalLocation. For example,
+		// if we request http://foo.com/a and get back "http://bar.com/b", the result should be
+		// http://bar.com/b. If we then make that request and get back a redirect to "/c", the result
+		// should be http://bar.com/c, not http://foo.com/c.
+		location, err = location.Parse(redirectStr)
+		if err != nil {
+			return nil, nil, fmt.Errorf("malformed Location header: %v", err)
+		}
+	}
+
+	connToReturn := intermediateConn
+	intermediateConn = nil // Don't close the connection when we return it.
+	return connToReturn, rawResponse.Bytes(), nil
+}
+
+// CloneRequest creates a shallow copy of the request along with a deep copy of the Headers.
+func CloneRequest(req *http.Request) *http.Request {
+	r := new(http.Request)
+
+	// shallow clone
+	*r = *req
+
+	// deep copy headers
+	r.Header = CloneHeader(req.Header)
+
+	return r
+}
+
+// CloneHeader creates a deep copy of an http.Header.
+func CloneHeader(in http.Header) http.Header {
+	out := make(http.Header, len(in))
+	for key, values := range in {
+		newValues := make([]string, len(values))
+		copy(newValues, values)
+		out[key] = newValues
+	}
+	return out
+}

vendor/k8s.io/apimachinery/pkg/util/net/interface.go

@@ -0,0 +1,392 @@
+/*
+Copyright 2016 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package net
+
+import (
+	"bufio"
+	"encoding/hex"
+	"fmt"
+	"io"
+	"net"
+	"os"
+
+	"strings"
+
+	"github.com/golang/glog"
+)
+
+type AddressFamily uint
+
+const (
+	familyIPv4 AddressFamily = 4
+	familyIPv6 AddressFamily = 6
+)
+
+const (
+	ipv4RouteFile = "/proc/net/route"
+	ipv6RouteFile = "/proc/net/ipv6_route"
+)
+
+type Route struct {
+	Interface   string
+	Destination net.IP
+	Gateway     net.IP
+	Family      AddressFamily
+}
+
+type RouteFile struct {
+	name  string
+	parse func(input io.Reader) ([]Route, error)
+}
+
+var (
+	v4File = RouteFile{name: ipv4RouteFile, parse: getIPv4DefaultRoutes}
+	v6File = RouteFile{name: ipv6RouteFile, parse: getIPv6DefaultRoutes}
+)
+
+func (rf RouteFile) extract() ([]Route, error) {
+	file, err := os.Open(rf.name)
+	if err != nil {
+		return nil, err
+	}
+	defer file.Close()
+	return rf.parse(file)
+}
+
+// getIPv4DefaultRoutes obtains the IPv4 routes, and filters out non-default routes.
+func getIPv4DefaultRoutes(input io.Reader) ([]Route, error) {
+	routes := []Route{}
+	scanner := bufio.NewReader(input)
+	for {
+		line, err := scanner.ReadString('\n')
+		if err == io.EOF {
+			break
+		}
+		//ignore the headers in the route info
+		if strings.HasPrefix(line, "Iface") {
+			continue
+		}
+		fields := strings.Fields(line)
+		// Interested in fields:
+		//  0 - interface name
+		//  1 - destination address
+		//  2 - gateway
+		dest, err := parseIP(fields[1], familyIPv4)
+		if err != nil {
+			return nil, err
+		}
+		gw, err := parseIP(fields[2], familyIPv4)
+		if err != nil {
+			return nil, err
+		}
+		if !dest.Equal(net.IPv4zero) {
+			continue
+		}
+		routes = append(routes, Route{
+			Interface:   fields[0],
+			Destination: dest,
+			Gateway:     gw,
+			Family:      familyIPv4,
+		})
+	}
+	return routes, nil
+}
+
+func getIPv6DefaultRoutes(input io.Reader) ([]Route, error) {
+	routes := []Route{}
+	scanner := bufio.NewReader(input)
+	for {
+		line, err := scanner.ReadString('\n')
+		if err == io.EOF {
+			break
+		}
+		fields := strings.Fields(line)
+		// Interested in fields:
+		//  0 - destination address
+		//  4 - gateway
+		//  9 - interface name
+		dest, err := parseIP(fields[0], familyIPv6)
+		if err != nil {
+			return nil, err
+		}
+		gw, err := parseIP(fields[4], familyIPv6)
+		if err != nil {
+			return nil, err
+		}
+		if !dest.Equal(net.IPv6zero) {
+			continue
+		}
+		if gw.Equal(net.IPv6zero) {
+			continue // loopback
+		}
+		routes = append(routes, Route{
+			Interface:   fields[9],
+			Destination: dest,
+			Gateway:     gw,
+			Family:      familyIPv6,
+		})
+	}
+	return routes, nil
+}
+
+// parseIP takes the hex IP address string from route file and converts it
+// to a net.IP address. For IPv4, the value must be converted to big endian.
+func parseIP(str string, family AddressFamily) (net.IP, error) {
+	if str == "" {
+		return nil, fmt.Errorf("input is nil")
+	}
+	bytes, err := hex.DecodeString(str)
+	if err != nil {
+		return nil, err
+	}
+	if family == familyIPv4 {
+		if len(bytes) != net.IPv4len {
+			return nil, fmt.Errorf("invalid IPv4 address in route")
+		}
+		return net.IP([]byte{bytes[3], bytes[2], bytes[1], bytes[0]}), nil
+	}
+	// Must be IPv6
+	if len(bytes) != net.IPv6len {
+		return nil, fmt.Errorf("invalid IPv6 address in route")
+	}
+	return net.IP(bytes), nil
+}
+
+func isInterfaceUp(intf *net.Interface) bool {
+	if intf == nil {
+		return false
+	}
+	if intf.Flags&net.FlagUp != 0 {
+		glog.V(4).Infof("Interface %v is up", intf.Name)
+		return true
+	}
+	return false
+}
+
+func isLoopbackOrPointToPoint(intf *net.Interface) bool {
+	return intf.Flags&(net.FlagLoopback|net.FlagPointToPoint) != 0
+}
+
+// getMatchingGlobalIP returns the first valid global unicast address of the given
+// 'family' from the list of 'addrs'.
+func getMatchingGlobalIP(addrs []net.Addr, family AddressFamily) (net.IP, error) {
+	if len(addrs) > 0 {
+		for i := range addrs {
+			glog.V(4).Infof("Checking addr  %s.", addrs[i].String())
+			ip, _, err := net.ParseCIDR(addrs[i].String())
+			if err != nil {
+				return nil, err
+			}
+			if memberOf(ip, family) {
+				if ip.IsGlobalUnicast() {
+					glog.V(4).Infof("IP found %v", ip)
+					return ip, nil
+				} else {
+					glog.V(4).Infof("Non-global unicast address found %v", ip)
+				}
+			} else {
+				glog.V(4).Infof("%v is not an IPv%d address", ip, int(family))
+			}
+
+		}
+	}
+	return nil, nil
+}
+
+// getIPFromInterface gets the IPs on an interface and returns a global unicast address, if any. The
+// interface must be up, the IP must in the family requested, and the IP must be a global unicast address.
+func getIPFromInterface(intfName string, forFamily AddressFamily, nw networkInterfacer) (net.IP, error) {
+	intf, err := nw.InterfaceByName(intfName)
+	if err != nil {
+		return nil, err
+	}
+	if isInterfaceUp(intf) {
+		addrs, err := nw.Addrs(intf)
+		if err != nil {
+			return nil, err
+		}
+		glog.V(4).Infof("Interface %q has %d addresses :%v.", intfName, len(addrs), addrs)
+		matchingIP, err := getMatchingGlobalIP(addrs, forFamily)
+		if err != nil {
+			return nil, err
+		}
+		if matchingIP != nil {
+			glog.V(4).Infof("Found valid IPv%d address %v for interface %q.", int(forFamily), matchingIP, intfName)
+			return matchingIP, nil
+		}
+	}
+	return nil, nil
+}
+
+// memberOF tells if the IP is of the desired family. Used for checking interface addresses.
+func memberOf(ip net.IP, family AddressFamily) bool {
+	if ip.To4() != nil {
+		return family == familyIPv4
+	} else {
+		return family == familyIPv6
+	}
+}
+
+// chooseIPFromHostInterfaces looks at all system interfaces, trying to find one that is up that
+// has a global unicast address (non-loopback, non-link local, non-point2point), and returns the IP.
+// Searches for IPv4 addresses, and then IPv6 addresses.
+func chooseIPFromHostInterfaces(nw networkInterfacer) (net.IP, error) {
+	intfs, err := nw.Interfaces()
+	if err != nil {
+		return nil, err
+	}
+	if len(intfs) == 0 {
+		return nil, fmt.Errorf("no interfaces found on host.")
+	}
+	for _, family := range []AddressFamily{familyIPv4, familyIPv6} {
+		glog.V(4).Infof("Looking for system interface with a global IPv%d address", uint(family))
+		for _, intf := range intfs {
+			if !isInterfaceUp(&intf) {
+				glog.V(4).Infof("Skipping: down interface %q", intf.Name)
+				continue
+			}
+			if isLoopbackOrPointToPoint(&intf) {
+				glog.V(4).Infof("Skipping: LB or P2P interface %q", intf.Name)
+				continue
+			}
+			addrs, err := nw.Addrs(&intf)
+			if err != nil {
+				return nil, err
+			}
+			if len(addrs) == 0 {
+				glog.V(4).Infof("Skipping: no addresses on interface %q", intf.Name)
+				continue
+			}
+			for _, addr := range addrs {
+				ip, _, err := net.ParseCIDR(addr.String())
+				if err != nil {
+					return nil, fmt.Errorf("Unable to parse CIDR for interface %q: %s", intf.Name, err)
+				}
+				if !memberOf(ip, family) {
+					glog.V(4).Infof("Skipping: no address family match for %q on interface %q.", ip, intf.Name)
+					continue
+				}
+				// TODO: Decide if should open up to allow IPv6 LLAs in future.
+				if !ip.IsGlobalUnicast() {
+					glog.V(4).Infof("Skipping: non-global address %q on interface %q.", ip, intf.Name)
+					continue
+				}
+				glog.V(4).Infof("Found global unicast address %q on interface %q.", ip, intf.Name)
+				return ip, nil
+			}
+		}
+	}
+	return nil, fmt.Errorf("no acceptable interface with global unicast address found on host")
+}
+
+// ChooseHostInterface is a method used fetch an IP for a daemon.
+// If there is no routing info file, it will choose a global IP from the system
+// interfaces. Otherwise, it will use IPv4 and IPv6 route information to return the
+// IP of the interface with a gateway on it (with priority given to IPv4). For a node
+// with no internet connection, it returns error.
+func ChooseHostInterface() (net.IP, error) {
+	var nw networkInterfacer = networkInterface{}
+	if _, err := os.Stat(ipv4RouteFile); os.IsNotExist(err) {
+		return chooseIPFromHostInterfaces(nw)
+	}
+	routes, err := getAllDefaultRoutes()
+	if err != nil {
+		return nil, err
+	}
+	return chooseHostInterfaceFromRoute(routes, nw)
+}
+
+// networkInterfacer defines an interface for several net library functions. Production
+// code will forward to net library functions, and unit tests will override the methods
+// for testing purposes.
+type networkInterfacer interface {
+	InterfaceByName(intfName string) (*net.Interface, error)
+	Addrs(intf *net.Interface) ([]net.Addr, error)
+	Interfaces() ([]net.Interface, error)
+}
+
+// networkInterface implements the networkInterfacer interface for production code, just
+// wrapping the underlying net library function calls.
+type networkInterface struct{}
+
+func (_ networkInterface) InterfaceByName(intfName string) (*net.Interface, error) {
+	return net.InterfaceByName(intfName)
+}
+
+func (_ networkInterface) Addrs(intf *net.Interface) ([]net.Addr, error) {
+	return intf.Addrs()
+}
+
+func (_ networkInterface) Interfaces() ([]net.Interface, error) {
+	return net.Interfaces()
+}
+
+// getAllDefaultRoutes obtains IPv4 and IPv6 default routes on the node. If unable
+// to read the IPv4 routing info file, we return an error. If unable to read the IPv6
+// routing info file (which is optional), we'll just use the IPv4 route information.
+// Using all the routing info, if no default routes are found, an error is returned.
+func getAllDefaultRoutes() ([]Route, error) {
+	routes, err := v4File.extract()
+	if err != nil {
+		return nil, err
+	}
+	v6Routes, _ := v6File.extract()
+	routes = append(routes, v6Routes...)
+	if len(routes) == 0 {
+		return nil, fmt.Errorf("No default routes.")
+	}
+	return routes, nil
+}
+
+// chooseHostInterfaceFromRoute cycles through each default route provided, looking for a
+// global IP address from the interface for the route. Will first look all each IPv4 route for
+// an IPv4 IP, and then will look at each IPv6 route for an IPv6 IP.
+func chooseHostInterfaceFromRoute(routes []Route, nw networkInterfacer) (net.IP, error) {
+	for _, family := range []AddressFamily{familyIPv4, familyIPv6} {
+		glog.V(4).Infof("Looking for default routes with IPv%d addresses", uint(family))
+		for _, route := range routes {
+			if route.Family != family {
+				continue
+			}
+			glog.V(4).Infof("Default route transits interface %q", route.Interface)
+			finalIP, err := getIPFromInterface(route.Interface, family, nw)
+			if err != nil {
+				return nil, err
+			}
+			if finalIP != nil {
+				glog.V(4).Infof("Found active IP %v ", finalIP)
+				return finalIP, nil
+			}
+		}
+	}
+	glog.V(4).Infof("No active IP found by looking at default routes")
+	return nil, fmt.Errorf("unable to select an IP from default routes.")
+}
+
+// If bind-address is usable, return it directly
+// If bind-address is not usable (unset, 0.0.0.0, or loopback), we will use the host's default
+// interface.
+func ChooseBindAddress(bindAddress net.IP) (net.IP, error) {
+	if bindAddress == nil || bindAddress.IsUnspecified() || bindAddress.IsLoopback() {
+		hostIP, err := ChooseHostInterface()
+		if err != nil {
+			return nil, err
+		}
+		bindAddress = hostIP
+	}
+	return bindAddress, nil
+}

vendor/k8s.io/apimachinery/pkg/util/net/port_range.go

@@ -0,0 +1,149 @@
+/*
+Copyright 2015 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package net
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+)
+
+// PortRange represents a range of TCP/UDP ports.  To represent a single port,
+// set Size to 1.
+type PortRange struct {
+	Base int
+	Size int
+}
+
+// Contains tests whether a given port falls within the PortRange.
+func (pr *PortRange) Contains(p int) bool {
+	return (p >= pr.Base) && ((p - pr.Base) < pr.Size)
+}
+
+// String converts the PortRange to a string representation, which can be
+// parsed by PortRange.Set or ParsePortRange.
+func (pr PortRange) String() string {
+	if pr.Size == 0 {
+		return ""
+	}
+	return fmt.Sprintf("%d-%d", pr.Base, pr.Base+pr.Size-1)
+}
+
+// Set parses a string of the form "value", "min-max", or "min+offset", inclusive at both ends, and
+// sets the PortRange from it.  This is part of the flag.Value and pflag.Value
+// interfaces.
+func (pr *PortRange) Set(value string) error {
+	const (
+		SinglePortNotation = 1 << iota
+		HyphenNotation
+		PlusNotation
+	)
+
+	value = strings.TrimSpace(value)
+	hyphenIndex := strings.Index(value, "-")
+	plusIndex := strings.Index(value, "+")
+
+	if value == "" {
+		pr.Base = 0
+		pr.Size = 0
+		return nil
+	}
+
+	var err error
+	var low, high int
+	var notation int
+
+	if plusIndex == -1 && hyphenIndex == -1 {
+		notation |= SinglePortNotation
+	}
+	if hyphenIndex != -1 {
+		notation |= HyphenNotation
+	}
+	if plusIndex != -1 {
+		notation |= PlusNotation
+	}
+
+	switch notation {
+	case SinglePortNotation:
+		var port int
+		port, err = strconv.Atoi(value)
+		if err != nil {
+			return err
+		}
+		low = port
+		high = port
+	case HyphenNotation:
+		low, err = strconv.Atoi(value[:hyphenIndex])
+		if err != nil {
+			return err
+		}
+		high, err = strconv.Atoi(value[hyphenIndex+1:])
+		if err != nil {
+			return err
+		}
+	case PlusNotation:
+		var offset int
+		low, err = strconv.Atoi(value[:plusIndex])
+		if err != nil {
+			return err
+		}
+		offset, err = strconv.Atoi(value[plusIndex+1:])
+		if err != nil {
+			return err
+		}
+		high = low + offset
+	default:
+		return fmt.Errorf("unable to parse port range: %s", value)
+	}
+
+	if low > 65535 || high > 65535 {
+		return fmt.Errorf("the port range cannot be greater than 65535: %s", value)
+	}
+
+	if high < low {
+		return fmt.Errorf("end port cannot be less than start port: %s", value)
+	}
+
+	pr.Base = low
+	pr.Size = 1 + high - low
+	return nil
+}
+
+// Type returns a descriptive string about this type.  This is part of the
+// pflag.Value interface.
+func (*PortRange) Type() string {
+	return "portRange"
+}
+
+// ParsePortRange parses a string of the form "min-max", inclusive at both
+// ends, and initializs a new PortRange from it.
+func ParsePortRange(value string) (*PortRange, error) {
+	pr := &PortRange{}
+	err := pr.Set(value)
+	if err != nil {
+		return nil, err
+	}
+	return pr, nil
+}
+
+func ParsePortRangeOrDie(value string) *PortRange {
+	pr, err := ParsePortRange(value)
+	if err != nil {
+		panic(fmt.Sprintf("couldn't parse port range %q: %v", value, err))
+	}
+	return pr
+}

vendor/k8s.io/apimachinery/pkg/util/net/port_split.go

@@ -0,0 +1,77 @@
+/*
+Copyright 2015 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package net
+
+import (
+	"strings"
+
+	"k8s.io/apimachinery/pkg/util/sets"
+)
+
+var validSchemes = sets.NewString("http", "https", "")
+
+// SplitSchemeNamePort takes a string of the following forms:
+//  * "<name>",                 returns "",        "<name>","",      true
+//  * "<name>:<port>",          returns "",        "<name>","<port>",true
+//  * "<scheme>:<name>:<port>", returns "<scheme>","<name>","<port>",true
+//
+// Name must be non-empty or valid will be returned false.
+// Scheme must be "http" or "https" if specified
+// Port is returned as a string, and it is not required to be numeric (could be
+// used for a named port, for example).
+func SplitSchemeNamePort(id string) (scheme, name, port string, valid bool) {
+	parts := strings.Split(id, ":")
+	switch len(parts) {
+	case 1:
+		name = parts[0]
+	case 2:
+		name = parts[0]
+		port = parts[1]
+	case 3:
+		scheme = parts[0]
+		name = parts[1]
+		port = parts[2]
+	default:
+		return "", "", "", false
+	}
+
+	if len(name) > 0 && validSchemes.Has(scheme) {
+		return scheme, name, port, true
+	} else {
+		return "", "", "", false
+	}
+}
+
+// JoinSchemeNamePort returns a string that specifies the scheme, name, and port:
+//  * "<name>"
+//  * "<name>:<port>"
+//  * "<scheme>:<name>:<port>"
+// None of the parameters may contain a ':' character
+// Name is required
+// Scheme must be "", "http", or "https"
+func JoinSchemeNamePort(scheme, name, port string) string {
+	if len(scheme) > 0 {
+		// Must include three segments to specify scheme
+		return scheme + ":" + name + ":" + port
+	}
+	if len(port) > 0 {
+		// Must include two segments to specify port
+		return name + ":" + port
+	}
+	// Return name alone
+	return name
+}

vendor/k8s.io/apimachinery/pkg/util/net/util.go

@@ -0,0 +1,56 @@
+/*
+Copyright 2016 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package net
+
+import (
+	"net"
+	"net/url"
+	"os"
+	"reflect"
+	"syscall"
+)
+
+// IPNetEqual checks if the two input IPNets are representing the same subnet.
+// For example,
+//	10.0.0.1/24 and 10.0.0.0/24 are the same subnet.
+//	10.0.0.1/24 and 10.0.0.0/25 are not the same subnet.
+func IPNetEqual(ipnet1, ipnet2 *net.IPNet) bool {
+	if ipnet1 == nil || ipnet2 == nil {
+		return false
+	}
+	if reflect.DeepEqual(ipnet1.Mask, ipnet2.Mask) && ipnet1.Contains(ipnet2.IP) && ipnet2.Contains(ipnet1.IP) {
+		return true
+	}
+	return false
+}
+
+// Returns if the given err is "connection reset by peer" error.
+func IsConnectionReset(err error) bool {
+	if urlErr, ok := err.(*url.Error); ok {
+		err = urlErr.Err
+	}
+	if opErr, ok := err.(*net.OpError); ok {
+		err = opErr.Err
+	}
+	if osErr, ok := err.(*os.SyscallError); ok {
+		err = osErr.Err
+	}
+	if errno, ok := err.(syscall.Errno); ok && errno == syscall.ECONNRESET {
+		return true
+	}
+	return false
+}