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package dhcpv6
import (
"fmt"
"net"
)
// InterfaceAddresses is used to fetch addresses of an interface with given name
var InterfaceAddresses func(string) ([]net.Addr, error) = interfaceAddresses
func interfaceAddresses(ifname string) ([]net.Addr, error) {
iface, err := net.InterfaceByName(ifname)
if err != nil {
return nil, err
}
return iface.Addrs()
}
func getMatchingAddr(ifname string, matches func(net.IP) bool) (net.IP, error) {
ifaddrs, err := InterfaceAddresses(ifname)
if err != nil {
return nil, err
}
for _, ifaddr := range ifaddrs {
if ifaddr, ok := ifaddr.(*net.IPNet); ok && matches(ifaddr.IP) {
return ifaddr.IP, nil
}
}
return nil, fmt.Errorf("no matching address found for interface %s", ifname)
}
// GetLinkLocalAddr returns a link-local address for the interface
func GetLinkLocalAddr(ifname string) (net.IP, error) {
return getMatchingAddr(ifname, func(ip net.IP) bool {
return ip.To4() == nil && ip.IsLinkLocalUnicast()
})
}
// GetGlobalAddr returns a global address for the interface
func GetGlobalAddr(ifname string) (net.IP, error) {
return getMatchingAddr(ifname, func(ip net.IP) bool {
return ip.To4() == nil && ip.IsGlobalUnicast()
})
}
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