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package main
// examples of what ifconfig does
// example of AF_NETLINK change:
// https://stackoverflow.com/questions/579783/how-to-detect-ip-address-change-programmatically-in-linux/2353441#2353441
// from that page, a link to watch for any ip event:
// https://github.com/angt/ipevent/blob/master/ipevent.c
// https://github.com/mdlayher/talks : Linux, Netlink, and Go in 7 minutes or less! (GopherCon 2018, lightning talk)
/*
c example from ipevent.c :
int fd = socket(PF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
struct sockaddr_nl snl = {
.nl_family = AF_NETLINK,
.nl_groups = RTMGRP_IPV4_IFADDR | RTMGRP_IPV6_IFADDR,
};
*/
/*
import (
// "os"
// "os/exec"
// "log"
// "net"
// "unix"
"github.com/vishvananda/netlink"
"github.com/jsimonetti/rtnetlink"
// "git.wit.org/wit/gui"
// "github.com/davecgh/go-spew/spew"
)
// In golang, write a function to register with netlink to detect changes to any network interface Use tab indentation. Do not include example usage.
func registerNetlink() error {
// Create netlink socket
sock, err := netlink.Socket(rtnetlink.NETLINK_ROUTE, 0)
if err != nil {
return err
}
// Register for interface change events
err = netlink.AddMembership(sock, netlink.RTNLGRP_LINK)
if err != nil {
return err
}
// Close the socket
defer sock.Close()
// Handle incoming notifications
for {
msgs, _, err := sock.Receive()
if err != nil {
return err
}
for _, msg := range msgs {
switch msg.Header.Type {
case unix.RTM_NEWLINK:
// Do something with new link
case unix.RTM_DELLINK:
// Do something with deleted link
}
}
}
return nil
}
*/
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