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#include "pcap.ih"
void Pcap::computeShift(char const *device)
{
// see the posting by user175104 on
// http://stackoverflow.com/questions/1779715/
// how-to-get-mac-address-of-your-machine-using-a-c-program
ifstream mac(("/sys/class/net/"s + device) + "/address");
string address;
d_shift = (mac >> address) ? 0 : PcapRecord::SIZEOF_ETHERNET_HEADER;
if (d_shift == 0)
imsg << "Device " << device << " has MAC address " << address << endl;
else
imsg << "Device " << device << " has no MAC address: packets lack "
"Ethernet headers" << endl;
}
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