62 lines
1.1 KiB
Go
62 lines
1.1 KiB
Go
package server
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import (
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"fmt"
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"net"
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"git.wntrmute.dev/kyle/kdhcp/bazel-kdhcp/external/com_github_davecgh_go_spew/spew"
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"git.wntrmute.dev/kyle/kdhcp/log"
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)
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type addr struct {
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ifi *net.Interface
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IP net.IP
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ipn *net.IPNet
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}
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func addrsForDevice(dev string) ([]addr, error) {
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netInterface, err := net.InterfaceByName(dev)
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if err != nil {
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return nil, fmt.Errorf("while selecting interface %s: %w", dev, err)
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}
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spew.Dump(netInterface)
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var addrs []addr
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devAddrs, err := netInterface.Addrs()
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if err != nil {
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return nil, err
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}
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for _, devAddr := range devAddrs {
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log.Debugf("consider %s", devAddr.String())
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ip, ipn, err := net.ParseCIDR(devAddr.String())
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if err != nil {
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continue
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}
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if ip == nil {
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continue // address isn't an IP address
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}
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log.Debugf("found IP: %s", ip)
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ip = ip.To4()
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// DHCP should only listen on private addresses.
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if !ip.IsPrivate() {
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log.Debugln("skipping non-private")
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continue
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}
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// only support IPv4 for now
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if len(ip) != 4 {
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log.Debugf("%d IP, only supporting v4 right now", len(ip))
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continue
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}
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addrs = append(addrs, addr{netInterface, ip, ipn})
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}
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return addrs, nil
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}
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