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How to tell scapy sniff() function to stop if no packet is received ? I'm sending packets with sendp() function Example: when sending DHCP Discover and no response is sent.
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The prn argument is defined as: prn: function to apply to each packet. If something is returned, it is displayed. For instance you can use prn = lambda x: x.
The sr() function is for sending packets and receiving answers. The function returns a couple of packet and answers, and the unanswered packets.
The technique is to send series of packets to the target with Time to Live (TTL) set in such a way that each router on the path will have to notify you of the death of the packet. The traceroute technique is based on the way the IP protocol is designed. TTL value in IP header is seen as hop limit.
The sniff() function in Scapy has a timeout parameter. You can provide a timeout in seconds.
You can find the other options by printing sniff.__doc__.
rypeck@laptop:~$ scapy
>>> print sniff.__doc__
Sniff packets
sniff([count=0,] [prn=None,] [store=1,] [offline=None,] [lfilter=None,] +
L2ListenSocket args) -> list of packets
count: number of packets to capture. 0 means infinity
store: wether to store sniffed packets or discard them
prn: function to apply to each packet. If something is returned,
it is displayed. Ex:
ex: prn = lambda x: x.summary()
lfilter: python function applied to each packet to determine
if further action may be done
ex: lfilter = lambda x: x.haslayer(Padding)
offline: pcap file to read packets from, instead of sniffing them
timeout: stop sniffing after a given time (default: None)
L2socket: use the provided L2socket
opened_socket: provide an object ready to use .recv() on
stop_filter: python function applied to each packet to determine
if we have to stop the capture after this packet
ex: stop_filter = lambda x: x.haslayer(TCP)
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