In article <[EMAIL PROTECTED]>, Alan DeKok <[EMAIL PROTECTED]> wrote: >"John Gruber" <[EMAIL PROTECTED]> wrote: >> But bind on * should work too.. and the reply should come from the address >> for the interface the request was sent to. It just doesn't, and I did not >> have the time at the time to see why in the code. > > It only works if you call bind() immediately upon receiving a >packet. That's expensive, and causes the server to do a *lot* of >work.
You mean immediately before sending a reply. But that creates a race condition, since you can then not receive packets from other interfaces anymore. Unless you use a seperate send and receive socket. However then you need to lock around the bind() / sendto() calls, to prevent race conditions between threads. It's not worth it. It's also impossible for another reason: you cannot know on which interface a certain UDP packet was received. recvfrom() only records the clients IP address, not the address of the interface the packet was received on. With Linux, you can use recvmsg() / sendmsg() with IP_PKTINFO in the ancillary data to get / set the local address, but that is not portable (though *BSD appears to have something similar). > A better solution is to explicitely list the addresses the server >listens on, which is much less expensive, but requires a bit more >code. And just open one socket for each address/port to listen on. Yes, that is the easiest solution by far. Mike. -- Anyone who is capable of getting themselves made President should on no account be allowed to do the job -- Douglas Adams. - List info/subscribe/unsubscribe? See http://www.freeradius.org/list/users.html
