139 lines
2.6 KiB
Go
139 lines
2.6 KiB
Go
package main
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import (
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"fmt"
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"github.com/vishvananda/netlink"
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"io"
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"log"
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"net"
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)
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type AddrSet struct {
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linkAttrs netlink.LinkAttrs
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linkChan chan netlink.LinkUpdate
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addrChan chan netlink.AddrUpdate
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addrs map[string]net.IP
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}
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func (addrs *AddrSet) String() string {
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return fmt.Sprintf("AddrSet iface=%v", addrs.linkAttrs.Name)
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}
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func (addrs *AddrSet) testFlag(flag net.Flags) bool {
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return addrs.linkAttrs.Flags&flag != 0
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}
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func (addrs *AddrSet) Up() bool {
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return addrs.testFlag(net.FlagUp)
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}
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func InterfaceAddrs(iface string, family Family) (*AddrSet, error) {
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var addrs AddrSet
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link, err := netlink.LinkByName(iface)
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if err != nil {
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return nil, fmt.Errorf("netlink.LinkByName %v: %v", iface, err)
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} else {
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addrs.linkAttrs = *link.Attrs()
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}
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// list
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if addrList, err := netlink.AddrList(link, int(family)); err != nil {
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return nil, fmt.Errorf("netlink.AddrList %v: %v", link, err)
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} else {
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addrs.addrs = make(map[string]net.IP)
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for _, addr := range addrList {
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addrs.updateAddr(addr, true)
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}
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}
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// update
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addrs.linkChan = make(chan netlink.LinkUpdate)
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addrs.addrChan = make(chan netlink.AddrUpdate)
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if err := netlink.LinkSubscribe(addrs.linkChan, nil); err != nil {
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return nil, fmt.Errorf("netlink.LinkSubscribe: %v", err)
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}
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if err := netlink.AddrSubscribe(addrs.addrChan, nil); err != nil {
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return nil, fmt.Errorf("netlink.AddrSubscribe: %v", err)
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}
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return &addrs, nil
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}
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func (addrs *AddrSet) Read() error {
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for {
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select {
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case linkUpdate, ok := <-addrs.linkChan:
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if !ok {
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return io.EOF
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}
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linkAttrs := linkUpdate.Attrs()
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if linkAttrs.Index != addrs.linkAttrs.Index {
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continue
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}
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// update state
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addrs.updateLink(*linkAttrs)
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case addrUpdate, ok := <-addrs.addrChan:
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if !ok {
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return io.EOF
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}
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if addrUpdate.LinkIndex != addrs.linkAttrs.Index {
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continue
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}
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// XXX: scope and other filters?
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addrs.updateAddr(addrUpdate.Addr, addrUpdate.NewAddr)
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return nil
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}
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}
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}
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// Update state for address
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func (addrs *AddrSet) updateAddr(addr netlink.Addr, up bool) {
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if addr.Scope >= int(netlink.SCOPE_LINK) {
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return
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}
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ip := addr.IP
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if up {
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log.Printf("%v: up %v", addrs, ip)
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addrs.addrs[ip.String()] = ip
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} else {
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log.Printf("%v: down %v", addrs, ip)
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delete(addrs.addrs, ip.String())
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}
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}
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func (addrs *AddrSet) updateLink(linkAttrs netlink.LinkAttrs) {
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addrs.linkAttrs = linkAttrs
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if !addrs.Up() {
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log.Printf("%v: down", addrs)
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}
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}
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func (addrs *AddrSet) Each(visitFunc func(net.IP)) {
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if !addrs.Up() {
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// link down has no up addrs
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return
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}
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for _, ip := range addrs.addrs {
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visitFunc(ip)
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}
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}
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