Hi
The buf gets populated starting with the dsap/ssap skipping the src/dst mac
addresses.
it does not make a difference with recv or recvfrom or recvmsg.
Peter
> On Oct 30, 2014, at 4:03 PM, Dieter Siegmund <die...@apple.com> wrote:
>
>
> Your receive buffer ‘buf’ should get populated with the entire frame starting
> with the link-layer (ethernet) header.
>
> Is that not the case? Does it make any difference if you use recv() instead
> of recvfrom()?
>
> Dieter
>
>> On Oct 30, 2014, at 3:48 PM, Peter Schoenmaker <lug...@gmail.com> wrote:
>>
>> hello,
>>
>> I am creating a socket connection to receive ethernet SAP frames. I am
>> correctly receiving the frame, but it starts at the 802.2 header
>> (DSAP/SSAP/Control.) I a receiving ethernet multicast packets. When i use
>> the recvfrom() call, i get the destination mac address, but i want the
>> source mac address.
>>
>> Short socket code:
>> so = socket(PF_NDRV, SOCK_RAW, 0);
>> ...
>> struct sockaddr sa;
>> memset(&sa, 0, sizeof(sa));
>> sa.sa_family = AF_NDRV;
>> strcpy(sa.sa_data, interfacename);
>>
>> // Bind socket to interface
>> int res = bind(so, (struct sockaddr *)&sa, sizeof(sa));
>> ...
>> if (setsockopt(so, SOL_NDRVPROTO, NDRV_SETDMXSPEC, &pdesc,
>> sizeof(struct ndrv_protocol_desc)) == -1) {
>> ...
>> if (setsockopt(so, SOL_NDRVPROTO, NDRV_ADDMULTICAST, dlp,
>> sizeof(struct sockaddr_dl)) == -1) {
>> ...
>>
>> recvfrom(so, buf, 65535, 0, addr_dl, sizeof(struct sockaddr_dl));
>> ...
>>
>> The data in the addr_dl contains the destination mac address, but no where
>> can i find the source mac address.
>>
>> Thanks
>>
>>
>> Peter
>>
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