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