diff options
Diffstat (limited to 'kube2msb/src/vendor/k8s.io/kubernetes/pkg/util/net/interface.go')
-rw-r--r-- | kube2msb/src/vendor/k8s.io/kubernetes/pkg/util/net/interface.go | 278 |
1 files changed, 0 insertions, 278 deletions
diff --git a/kube2msb/src/vendor/k8s.io/kubernetes/pkg/util/net/interface.go b/kube2msb/src/vendor/k8s.io/kubernetes/pkg/util/net/interface.go deleted file mode 100644 index a1e53d2..0000000 --- a/kube2msb/src/vendor/k8s.io/kubernetes/pkg/util/net/interface.go +++ /dev/null @@ -1,278 +0,0 @@ -/* -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 -} |