Error getting WinPcap address information

Question

Hello i am having some problem getting network card address information from the WinPcap driver. I have noticed that whenever IPv6 is enabled for a particular NIC, the address information for it becomes 0.0.0.0. How can i fix this?

pcap_addr* address = GetDeviceAddress(1);

cout<<"IP address "<<iptos(((struct sockaddr_in *)address->addr)->sin_addr.s_addr)<<endl;
/////////////

pcap_addr* GetDeviceAddress(int index)//Gets the name of a device using the zero based index of its location in the list
    {
        int i=0;
            if(pcap_findalldevs_ex(PCAP_SRC_IF_STRING,NULL,&AllDevices,errbuf) != -1)
                for(Iterator=AllDevices;Iterator!=NULL;Iterator=Iterator->next)
                {
                    if(i==index)
                    {
                        return Iterator->addresses;
                    }
                i++;
                }
                return NULL;
    }

score 1 · Accepted Answer · answered Aug 20 '12 at 21:07

What does your code that's looking at the address information look like? Perhaps it has a bug that causes it not to properly handle IPv6 addresses.

The address information may have more than one IP address - libpcap/WinPcap's pcap_findalldevs() call and WinPcap's pcap_findalldevs_ex() call supply a pointer to a list of pcap_if_t structures, one for each interface that it found, and each of those structures includes a list of address information items of type struct pcap_addr. Each of those address information items includes a network address, which is of type struct sockaddr; that structure includes a member named sa_family, which will have the value AF_INET for IPv4 and AF_INET6 for IPv6. If the member has the value AF_INET6, the address data will be 128 bits of IPv6 address, NOT 32 bits of IPv4 address.

Error getting WinPcap address information

1 Answers1