Hi,
On 2015年07月07日 09:33, Adrián Fernández wrote:
> Hello,
>
> I trying to use packet lib to extract the ipv4 source address from arp and
> ip4 packets, but I get the following error: AttributeError: 'NoneType' object
> has no attribute 'src'. Any advice?
>
> pkt = packet.Packet(array.array('B', msg.data))
> eth_pkt = pkt.get_protocol(ethernet.ethernet)
> arp_pkt = pkt.get_protocol(arp.arp)
> ip4_pkt = pkt.get_protocol(ipv4.ipv4)
>
> if arp_pkt:
> pak = arp_pkt
> elif ip4_pkt:
> pak = ip4_pkt
> else:
> pak = eth_pkt
>
> mac_src = eth_pkt.src
> mac_dst = eth_pkt.dst
> #arp_src = arp_pkt.src_ip
> ip4_src = ip4_pkt.src
When ARP packet received, value of "ipv4_pkt" will be None.
How about the following?
mac_src = eth_pkt.src
mac_dst = eth_pkt.dst
- #arp_src = arp_pkt.src_ip
- ip4_src = ip4_pkt.src
+ if arp_pkt:
+ arp_src = arp_pkt.src_ip
+ elif ip4_pkt:
+ ip4_src = ip4_pkt.src
thanks,
>
> thank you.
>
>
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