[Winpcap-users] Real time sending packets

[Gianluca Varenni]

You can definitely use the same pcap_t instance to send and transmit at the same time, with one caveat: if you use the same pcap_t handle from two different threads (e.g. one that receives and one that transmits), then you need to provide the necessary synchronization around the pcap_t handle.

Regarding pcap_sendpacket vs sendqueue_transmit, it depends on your requirements. If you need to transfer one packet at a time, the you want to use pcap_sendpacket. If you can batch packets and transmit them all together, I would think of using the sendqueue functions.

Have a nice day
GV

  ----- Original Message ----- 
  From: Carlo Medas 
  To: winpcap-users at winpcap.org 
  Sent: Thursday, October 23, 2008 11:41 PM
  Subject: Re: [Winpcap-users] Real time sending packets


  Dear Lesher,


  please take my answer until Gianluca or some other guru officially answers you.


  I've been doing something like you and I use a single pcap session with success. Tested on Linux, Windows and Mac.


  Br,


  \Carlo


  On Thu, Oct 23, 2008 at 6:33 PM, <ceo at triplebit.com> wrote:

    I want to inject UDP packets to the interface in real time. In other words, the program should run endlessly,capturing  the interface and for every input packet(with the right filter), it should establish a packet from this data and send it again to a third address.
    What is the most aprroprite function for that- the users guide speaks about pcap_sendpacket and pcap_sndqueue_transmit?

    Another question-
    Does the open function, pcap_open should be called once or twice(once again for the packet send) for the above procedure?

    I. Lesher



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