Hi,
I need to do 2 things:
1. Monitor when interfaces go up or down. (Or perhaps when addresses get
added/deleted).
2. Given a destination address, figure out the source address (which
interface it's going to go out of).
After some reading, it looks like the best option is to use rtnetlink and
for 1. listen for rtm_new/dellink (or rtm__new/deladdr) messages from
kernel.
for 2. use rtnetlink and rtm_getroute option or maybe read /proc/net/route
I have some concerns. For example, older messages in this list point out
that netlink messages are unreliable. So you might not get all
rtm_newlink messages. Another example, iptables can be used to force a
particular route, this would not show up in /proc/net/route or the
routing entries.
But generally speaking, are my choices to solve my problems 1 and 2 the
correct ones or are there easier ways (ie, some functions I can just call)?
Thanks,
Chinh
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