Ask for link and address data on the same socket.

[Tilman Baumann]

On 11/07/13 20:32, Thomas Graf wrote:
> On 07/10/13 at 03:48pm, Tilman Baumann wrote:
>> On 04/07/13 20:55, Thomas Graf wrote:
>>
>> The parse part can deal with both types of responses very well.
>> Do you mean I should send the requests individually via send() and with
>> NLMSG_DONE?
>> Or assemble the request chain how I did with NLMSG_NEXT() and a empty or
>> rtgenmsg request with NLMSG_DONE at the end?
> The kernel is not ready to handle that.
>
> I suggest that you use individual send() calls to send the RTM_GETADDR
> and RTM_GETLINK requests so you don't need to send a NLMSG_DONE
> message at all.
Thanks again for taking your time.

I simplified the code a bit. Too much cargo cult going on. (Still the
case, but I think I grokk it)

I assemble two messages, one RTM_GETLINK and one RTM_GETADDR, and send
them individually.
But my receive function again only receives the first one.

I think I'm still missing a clue here.
If you like I can send you my receive function.

My request function now:
{
        int status;
        struct {
              struct nlmsghdr n;
              struct ifaddrmsg r;
        } ifaddr_req;

        struct {
              struct nlmsghdr n;
              struct ifinfomsg r;
        } ifinfo_req;

        memset(&ifaddr_req, 0, sizeof(ifaddr_req));
        ifaddr_req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrmsg));
        ifaddr_req.n.nlmsg_flags = NLM_F_REQUEST | NLM_F_ROOT;
        ifaddr_req.n.nlmsg_type = RTM_GETADDR;

        status = send(netlinkfd, &ifaddr_req, ifaddr_req.n.nlmsg_len, 0);
        if (status < 0) {
                perror("[Listener] send");
                return 1;
        }

        memset(&ifinfo_req, 0, sizeof(ifinfo_req));
        ifinfo_req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrmsg));
        ifinfo_req.n.nlmsg_flags = NLM_F_REQUEST | NLM_F_ROOT;
        ifinfo_req.n.nlmsg_type = RTM_GETLINK;

        status = send(netlinkfd, &ifinfo_req, ifinfo_req.n.nlmsg_len, 0);
        if (status < 0) {
                perror("[Listener] send");
                return 1;
        }
        return 1;
}