97 lines
1.7 KiB
Go
97 lines
1.7 KiB
Go
package vip
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import (
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"errors"
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"github.com/vishvananda/netlink"
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"net"
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)
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var ErrNoDefaultInterface = errors.New("no default interface found")
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func DefaultInterface() (iface string, err error) {
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routes, err := netlink.RouteGet(net.IPv4bcast)
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if err != nil {
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return
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}
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if len(routes) >= 1 {
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link, e := netlink.LinkByIndex(routes[0].LinkIndex)
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if e != nil {
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err = e
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return
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}
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return link.Attrs().Name, nil
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}
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err = ErrNoDefaultInterface
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return
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}
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type Network struct {
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iface string
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label string
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link netlink.Link
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}
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func NewNetwork(iface string) (n *Network, err error) {
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return NewNetworkWithLabel(iface, "")
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}
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func NewNetworkWithLabel(iface, label string) (n *Network, err error) {
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if iface == "" {
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iface, err = DefaultInterface()
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if err != nil {
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return
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}
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}
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link, err := netlink.LinkByName(iface)
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if err != nil {
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return
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}
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n = &Network{iface, label, link}
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return
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}
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func (n *Network) Interface() string {
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return n.iface
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}
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func (n *Network) HasIP(a *netlink.Addr) bool {
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addrs, err := netlink.AddrList(n.link, 0)
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if err != nil {
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return false
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}
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for _, addr := range addrs {
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if addr.Equal(*a) {
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return true
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}
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}
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return false
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}
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func (n *Network) AddIP(cidr string) error {
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addr, err := netlink.ParseAddr(cidr)
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if err != nil {
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return err
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}
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if n.HasIP(addr) {
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return nil
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}
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if n.label != "" {
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addr.Label = n.iface + ":" + n.label
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}
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err = netlink.AddrReplace(n.link, addr)
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if err != nil {
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return err
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}
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return ARPSendGratuitous(cidr, n.iface)
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}
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func (n *Network) DeleteIP(cidr string) error {
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addr, err := netlink.ParseAddr(cidr)
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if err != nil {
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return err
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}
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if !n.HasIP(addr) {
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return nil
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}
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return netlink.AddrDel(n.link, addr)
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}
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