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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