tcpdump mailing list archives
Re: Multiple interface listening modification
From: Tugrul Erdogan <h.tugrul.erdogan () gmail com>
Date: Wed, 1 Jul 2015 08:27:34 +0300
Thanks for your replies Michal and Guy, The main handicap is using libpcap based user space tools like tcpdump, tcpstat, tshark on my project. If I change Libpcap usages on that user level applications, I must leave the upstreams of that applications so I can not face leaving this much project's upstreams. For this reason I desired to adapt Libpcap which is dynamically linked in other user space tools that are mentioned in the previous sentence. I have defined an pcap_t->fd array and coded the multiple socket adaptation on Libpcap 1.7.3. It seems running successfully. I want to tanks you again for your helps. Best regards. Tugrul On Thu, Jun 4, 2015 at 7:38 PM, Guy Harris <guy () alum mit edu> wrote:
On Jun 4, 2015, at 12:37 AM, Michal Sekletar <msekleta () redhat com> wrote:Can't you just pcap_open more interfaces and for each pcap_t* you getcall pcap_fileno which will return back file descriptor for that capture. Then you can use select/epoll to multiplex on those descriptors. Or, in newer versions of libpcap, call pcap_get_selectable_fd(), which, for devices on which you can capture but on which you *can't* use select()/poll()/epoll()/kqueues, returns -1. (Yes, they do exist; the DAG card drivers don't support it.) BTW, that's also one problem with having a single pcap_t refer to multiple devices - a lot of code out there expects a single descriptor on which it can do select()/poll()/epoll()/kqueues, and you can't do that if a single pcap_t refers to multiple devices. _______________________________________________ tcpdump-workers mailing list tcpdump-workers () lists tcpdump org https://lists.sandelman.ca/mailman/listinfo/tcpdump-workers
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Current thread:
- Re: Multiple interface listening modification Tugrul Erdogan (Jun 30)