Vendor main dependencies.

vendor/k8s.io/client-go/1.5/pkg/util/net/http.go

@@ -0,0 +1,263 @@
+/*
+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 (
+	"crypto/tls"
+	"fmt"
+	"io"
+	"net"
+	"net/http"
+	"net/url"
+	"os"
+	"strconv"
+	"strings"
+
+	"github.com/golang/glog"
+	"golang.org/x/net/http2"
+)
+
+// 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 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.Dial == nil {
+		t.Dial = defaultTransport.Dial
+	}
+	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(net, addr string) (net.Conn, error)
+
+func Dialer(transport http.RoundTripper) (DialFunc, error) {
+	if transport == nil {
+		return nil, nil
+	}
+
+	switch transport := transport.(type) {
+	case *http.Transport:
+		return transport.Dial, nil
+	case RoundTripperWrapper:
+		return Dialer(transport.WrappedRoundTripper())
+	default:
+		return nil, fmt.Errorf("unknown transport type: %v", transport)
+	}
+}
+
+// CloneTLSConfig returns a tls.Config with all exported fields except SessionTicketsDisabled and SessionTicketKey copied.
+// This makes it safe to call CloneTLSConfig on a config in active use by a server.
+// TODO: replace with tls.Config#Clone when we move to go1.8
+func CloneTLSConfig(cfg *tls.Config) *tls.Config {
+	if cfg == nil {
+		return &tls.Config{}
+	}
+	return &tls.Config{
+		Rand:                     cfg.Rand,
+		Time:                     cfg.Time,
+		Certificates:             cfg.Certificates,
+		NameToCertificate:        cfg.NameToCertificate,
+		GetCertificate:           cfg.GetCertificate,
+		RootCAs:                  cfg.RootCAs,
+		NextProtos:               cfg.NextProtos,
+		ServerName:               cfg.ServerName,
+		ClientAuth:               cfg.ClientAuth,
+		ClientCAs:                cfg.ClientCAs,
+		InsecureSkipVerify:       cfg.InsecureSkipVerify,
+		CipherSuites:             cfg.CipherSuites,
+		PreferServerCipherSuites: cfg.PreferServerCipherSuites,
+		ClientSessionCache:       cfg.ClientSessionCache,
+		MinVersion:               cfg.MinVersion,
+		MaxVersion:               cfg.MaxVersion,
+		CurvePreferences:         cfg.CurvePreferences,
+	}
+}
+
+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 RoundTripperWrapper:
+		return TLSClientConfig(transport.WrappedRoundTripper())
+	default:
+		return nil, fmt.Errorf("unknown transport type: %v", 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"
+}
+
+// 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 {
+	hdr := req.Header
+	// First check the X-Forwarded-For header for requests via proxy.
+	hdrForwardedFor := hdr.Get("X-Forwarded-For")
+	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 {
+				return ip
+			}
+		}
+	}
+
+	// Try the X-Real-Ip header.
+	hdrRealIp := hdr.Get("X-Real-Ip")
+	if hdrRealIp != "" {
+		ip := net.ParseIP(hdrRealIp)
+		if ip != nil {
+			return 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 {
+		return net.ParseIP(host)
+	}
+
+	// Fallback if Remote Address was just IP.
+	return net.ParseIP(req.RemoteAddr)
+}
+
+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 envvar has a CIDR in it
+	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) {
+		host := req.URL.Host
+		// for some urls, the Host is already the host, not the host:port
+		if net.ParseIP(host) == nil {
+			var err error
+			host, _, err = net.SplitHostPort(req.URL.Host)
+			if err != nil {
+				return delegate(req)
+			}
+		}
+
+		ip := net.ParseIP(host)
+		if ip == nil {
+			return delegate(req)
+		}
+
+		for _, cidr := range cidrs {
+			if cidr.Contains(ip) {
+				return nil, nil
+			}
+		}
+
+		return delegate(req)
+	}
+}

vendor/k8s.io/client-go/1.5/pkg/util/net/interface.go

@@ -0,0 +1,278 @@
+/*
+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 Route struct {
+	Interface   string
+	Destination net.IP
+	Gateway     net.IP
+	// TODO: add more fields here if needed
+}
+
+func getRoutes(input io.Reader) ([]Route, error) {
+	routes := []Route{}
+	if input == nil {
+		return nil, fmt.Errorf("input is nil")
+	}
+	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)
+		routes = append(routes, Route{})
+		route := &routes[len(routes)-1]
+		route.Interface = fields[0]
+		ip, err := parseIP(fields[1])
+		if err != nil {
+			return nil, err
+		}
+		route.Destination = ip
+		ip, err = parseIP(fields[2])
+		if err != nil {
+			return nil, err
+		}
+		route.Gateway = ip
+	}
+	return routes, nil
+}
+
+func parseIP(str string) (net.IP, error) {
+	if str == "" {
+		return nil, fmt.Errorf("input is nil")
+	}
+	bytes, err := hex.DecodeString(str)
+	if err != nil {
+		return nil, err
+	}
+	//TODO add ipv6 support
+	if len(bytes) != net.IPv4len {
+		return nil, fmt.Errorf("only IPv4 is supported")
+	}
+	bytes[0], bytes[1], bytes[2], bytes[3] = bytes[3], bytes[2], bytes[1], bytes[0]
+	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
+}
+
+//getFinalIP method receives all the IP addrs of a Interface
+//and returns a nil if the address is Loopback, Ipv6, link-local or nil.
+//It returns a valid IPv4 if an Ipv4 address is found in the array.
+func getFinalIP(addrs []net.Addr) (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
+			}
+			//Only IPv4
+			//TODO : add IPv6 support
+			if ip.To4() != nil {
+				if !ip.IsLoopback() && !ip.IsLinkLocalMulticast() && !ip.IsLinkLocalUnicast() {
+					glog.V(4).Infof("IP found %v", ip)
+					return ip, nil
+				} else {
+					glog.V(4).Infof("Loopback/link-local found %v", ip)
+				}
+			} else {
+				glog.V(4).Infof("%v is not a valid IPv4 address", ip)
+			}
+
+		}
+	}
+	return nil, nil
+}
+
+func getIPFromInterface(intfName string, 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)
+		finalIP, err := getFinalIP(addrs)
+		if err != nil {
+			return nil, err
+		}
+		if finalIP != nil {
+			glog.V(4).Infof("valid IPv4 address for interface %q found as %v.", intfName, finalIP)
+			return finalIP, nil
+		}
+	}
+
+	return nil, nil
+}
+
+func flagsSet(flags net.Flags, test net.Flags) bool {
+	return flags&test != 0
+}
+
+func flagsClear(flags net.Flags, test net.Flags) bool {
+	return flags&test == 0
+}
+
+func chooseHostInterfaceNativeGo() (net.IP, error) {
+	intfs, err := net.Interfaces()
+	if err != nil {
+		return nil, err
+	}
+	i := 0
+	var ip net.IP
+	for i = range intfs {
+		if flagsSet(intfs[i].Flags, net.FlagUp) && flagsClear(intfs[i].Flags, net.FlagLoopback|net.FlagPointToPoint) {
+			addrs, err := intfs[i].Addrs()
+			if err != nil {
+				return nil, err
+			}
+			if len(addrs) > 0 {
+				for _, addr := range addrs {
+					if addrIP, _, err := net.ParseCIDR(addr.String()); err == nil {
+						if addrIP.To4() != nil {
+							ip = addrIP.To4()
+							if !ip.IsLinkLocalMulticast() && !ip.IsLinkLocalUnicast() {
+								break
+							}
+						}
+					}
+				}
+				if ip != nil {
+					// This interface should suffice.
+					break
+				}
+			}
+		}
+	}
+	if ip == nil {
+		return nil, fmt.Errorf("no acceptable interface from host")
+	}
+	glog.V(4).Infof("Choosing interface %s (IP %v) as default", intfs[i].Name, ip)
+	return ip, nil
+}
+
+//ChooseHostInterface is a method used fetch an IP for a daemon.
+//It uses data from /proc/net/route file.
+//For a node with no internet connection ,it returns error
+//For a multi n/w interface node it returns the IP of the interface with gateway on it.
+func ChooseHostInterface() (net.IP, error) {
+	inFile, err := os.Open("/proc/net/route")
+	if err != nil {
+		if os.IsNotExist(err) {
+			return chooseHostInterfaceNativeGo()
+		}
+		return nil, err
+	}
+	defer inFile.Close()
+	var nw networkInterfacer = networkInterface{}
+	return chooseHostInterfaceFromRoute(inFile, nw)
+}
+
+type networkInterfacer interface {
+	InterfaceByName(intfName string) (*net.Interface, error)
+	Addrs(intf *net.Interface) ([]net.Addr, error)
+}
+
+type networkInterface struct{}
+
+func (_ networkInterface) InterfaceByName(intfName string) (*net.Interface, error) {
+	intf, err := net.InterfaceByName(intfName)
+	if err != nil {
+		return nil, err
+	}
+	return intf, nil
+}
+
+func (_ networkInterface) Addrs(intf *net.Interface) ([]net.Addr, error) {
+	addrs, err := intf.Addrs()
+	if err != nil {
+		return nil, err
+	}
+	return addrs, nil
+}
+
+func chooseHostInterfaceFromRoute(inFile io.Reader, nw networkInterfacer) (net.IP, error) {
+	routes, err := getRoutes(inFile)
+	if err != nil {
+		return nil, err
+	}
+	zero := net.IP{0, 0, 0, 0}
+	var finalIP net.IP
+	for i := range routes {
+		//find interface with gateway
+		if routes[i].Destination.Equal(zero) {
+			glog.V(4).Infof("Default route transits interface %q", routes[i].Interface)
+			finalIP, err := getIPFromInterface(routes[i].Interface, nw)
+			if err != nil {
+				return nil, err
+			}
+			if finalIP != nil {
+				glog.V(4).Infof("Choosing IP %v ", finalIP)
+				return finalIP, nil
+			}
+		}
+	}
+	glog.V(4).Infof("No valid IP found")
+	if finalIP == nil {
+		return nil, fmt.Errorf("Unable to select an IP.")
+	}
+	return nil, nil
+}
+
+// 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/client-go/1.5/pkg/util/net/port_range.go

@@ -0,0 +1,113 @@
+/*
+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 "min-max", 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 {
+	value = strings.TrimSpace(value)
+
+	// TODO: Accept "80" syntax
+	// TODO: Accept "80+8" syntax
+
+	if value == "" {
+		pr.Base = 0
+		pr.Size = 0
+		return nil
+	}
+
+	hyphenIndex := strings.Index(value, "-")
+	if hyphenIndex == -1 {
+		return fmt.Errorf("expected hyphen in port range")
+	}
+
+	var err error
+	var low int
+	var high int
+	low, err = strconv.Atoi(value[:hyphenIndex])
+	if err == nil {
+		high, err = strconv.Atoi(value[hyphenIndex+1:])
+	}
+	if err != nil {
+		return fmt.Errorf("unable to parse port range: %s: %v", value, err)
+	}
+
+	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/client-go/1.5/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/client-go/1.5/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/client-go/1.5/pkg/util/net/util.go

@@ -0,0 +1,36 @@
+/*
+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"
+	"reflect"
+)
+
+// 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
+}