Re: Problem with pcap_set_datalinkDLT_IEEE802_11_RADIO

[Elton Lika <tonlika () live com>]

Also pcap_list_datalinks returns only DLT_NULL for the device.

On 09/11/2013 09:56 AM, Elton Lika wrote:
> I am using libpcap-dev 0.9.8 in Ubuntu 12.04 on my laptop.
>
> Setting my wlan0 interface to monitor mode using iwconfig and tcpdump -i
> wlan0 -y IEEE802_11_RADIO
>
> works fine but when doing it in C it fails with an DLT not supported by
> device error.
>
>   
>
> Here is the source code excerpt that fails:
>
>   
>
>              /* Set device in monitor mode */
>
>              if(pcap_can_set_rfmon(handle)) {
>
>                          if(pcap_set_rfmon(handle, 1) ==
> PCAP_ERROR_ACTIVATED) {
>
>   
>
>                                     printf("Failed to activate monitor
> mode\n");
>
>                                     exit(EXIT_FAILURE);
>
>                          }
>
>              }else{
>
>                          printf("Cannot set monitor mode\n");
>
>                          exit(EXIT_FAILURE);
>
>              }
>
>              
>
>              /* Set additional settings for pcap */
>
>              pcap_set_snaplen(handle, 2048);
>
>              pcap_set_promisc(handle, 1);
>
>              pcap_set_timeout(handle, 100);
>
>              pcap_activate(handle);
>
>              
>
>              /* Set datalink type */
>
>              if(pcap_set_datalink(handle, DLT_IEEE802_11_RADIO) == -1) {   //
> returns -1 on device that supports this DLT
>
>                          printf("Couldn't set datalink type %s: %s\n",
> device, pcap_geterr(handle));
>
>              }
>
>   
>
> What could be the problem?
>
>   
>
> Thanks in advance.
>
> Elton Lika
>
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