Re: PF_PACKET
Re: PF_PACKET
- Subject: Re: PF_PACKET
- From: "Duane Murphy" <email@hidden>
- Date: Fri, 23 Jul 2004 21:36:00 -0700
--- At Fri, 23 Jul 2004 16:45:26 -0700, Rich Kubota wrote:
>
Enrico,
>
>
You could use a bpf socket in order to send packets, as well as to
>
receive packets. However, I don't have a sample of the use of a bpf
>
sample for sending packets. The only sample which I have demonstrates
>
how to receive packets.
There is really no point in using a BPF socket to _send_ anything. BPF is
meant to _receive_ datagrams that aren't usually available to other
processes. The canonical example for BPF is ARP because ARP packets are
eaten by the IP stack.
Sending a packet using a BPF socket is the same as sending a packet using
a raw ethernet socket. For sending, we use a raw socket.
>
At 11:29 AM +0200 7/23/04, Enrico lupsyn Del Zotto wrote:
>
>I see what you are taking about, but i understand (by my search on
>
>google) that there is a method to build and send an arp packet + eth
>
>header with bpf is it possible ?
>
>thx
>
>Il giorno 22/lug/04, alle 18:24, Rich Kubota ha scritto:
>
>
>
>> At 3:17 PM +0200 7/22/04, Enrico lupsyn Del Zotto wrote:
>
>>> I must send a packet ( eth header, and arp packet ) over the en0.
>
>>> In linux i use the sockaddr_ll struct and a PF_Packet. Now in bsd
>
>>>i don't know how do it ,
>
>>> can someone help me ?
>
>>> thx,bye
>
>>>
>
>> Enrico,
>
>>
>
>> For this, you want to open a PF_NDRV socket to send out a raw
>
>>ethernet packet. Take a look at the sample code BSDLLCTest
>
>> <http://developer.apple.com/samplecode/BSDLLCTest/BSDLLCTest.html>
>
>>
>
>> This sample demonstrates the technique to open a PF_NDRV socket,
>
>>which requires root access, then demonstrates both the send and
>
>>receive of packets using this socket.
>
>>
>
>> Sending raw packets is straightforward, but the sample is designed
>
>>to receive LLC Ethernet frames. You'll need to tweak the sample to
>
>>receive a phase I Ethernet frame for a tcp packet, if this is
>
>>within the scope of your project.
...Duane
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