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iface.go
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iface.go
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/*
* Copyright 2020 The terminus 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 iface
import (
"errors"
"github.com/c-robinson/iplib"
"net"
"strings"
)
const (
// Broadcast address
Broadcast = "broadcast"
// First usable IP address of the subnet
First = "first"
// IP address
IP = "ip"
// Last usable IP address of the subnet
Last = "last"
// Name of the interface
Name = "name"
// NetMask of the subnet
NetMask = "netmask"
// Network address
Network = "network"
// Prefix in bits
Prefix = "prefix"
// Size of the subnet
Size = "size"
// UsableSize of the subnet
UsableSize = "usable"
// Version of the IP address
Version = "version"
// Wildcard mask
Wildcard = "wildcard"
)
var errNoIP = errors.New("no IP address")
// GetAddr returns the first IPv4 unicast address for the interface specified by name.
func GetAddr(name string) (ip net.IP, n iplib.Net, err error) {
i, err := net.InterfaceByName(name)
if err != nil {
return ip, n, errors.New(errors.Unwrap(err).Error() + ": " + name)
}
addrs, err := i.Addrs()
if err != nil {
return ip, n, errors.Unwrap(err)
}
for _, a := range addrs {
if n, ok := a.(*net.IPNet); ok {
if size, bits := n.Mask.Size(); bits == 32 {
return n.IP, iplib.NewNet(n.IP, size), nil
}
}
}
return ip, n, errNoIP
}
// GetParams returns the parameters for the specified IP.
func GetParams(name string, ip net.IP, mask net.IPMask) (m map[string]interface{}) {
size, _ := mask.Size()
n := iplib.NewNet(ip, size)
m = make(map[string]interface{})
m[Broadcast] = n.BroadcastAddress()
m[First] = n.FirstAddress()
m[Name] = name
if ip.String() == strings.SplitN(name, "/", 2)[0] {
m[Name] = findInterface(ip)
}
m[Network] = n.NetworkAddress()
m[IP] = ip
m[Last] = n.LastAddress()
m[NetMask] = net.IP(mask)
m[Prefix] = size
m[Size] = int(n.Count4() + 2)
m[UsableSize] = int(n.Count())
m[Version] = n.Version()
m[Wildcard] = net.IP(n.Wildcard())
// special handling for /32 and /31
if size == 32 {
m[Size] = 1
} else if size == 31 {
m[Size] = 2
}
return m
}
func findInterface(ip net.IP) string {
is, err := net.Interfaces()
if err != nil {
return ""
}
for _, i := range is {
addrs, err := i.Addrs()
if err != nil {
continue
}
for _, a := range addrs {
if ia, ok := a.(*net.IPNet); ok && ip.Equal(ia.IP) {
return i.Name
}
}
}
return ""
}