Scapy: the Python-based interactive packet manipulation program & library
Yes. X just means "hexadecimal", it's not literally raw
hi, maybe someone could help me with packet[Raw].load - how to add new payload? (packet is RTP)
Hello, Ive been having some difficulty extracting some information from a packet, namely one that has the TLS layer. I'm trying to get the extensions_server_name from a Client Hello request, I've been trying to access the extensions class but to no avail, any suggestions?
Hello, How to remove a Packet from a PCAP file using Scapy ?
Hi, you can deserialize a pcap file with rdpcap(...). This returns a PacketList. From this PacketList, remove the desired packet. Finally you can serialize this packet list back into a pcap file with wrpcap(...)
Thank you M. @polybassa for this response, but I'm looking for a Scapy function able to remove complete packet, I found 'remove_payload' which remove only a part of packet.
Can someone help me?
I want to use sendpfast as an lab. I want to send 10Mbps, but the link bandwidth is only 1Mbps. I want to measure the packet loss, but the speed seems to drop because of the link bandwidth, and it drops to the link bandwidth.
@MariMari7 You can use native python functions (e.g. mylist.pop(1) ) on the list of packets returned by rdpcap(...) to remove the packet from the list.
Hi, I want to create a packet which Contains two DoIP/UDS Messages. So something like this: IP()/TCP()/DoIP(Data1)/UDS(Data1)/DoIP(Data2)/UDS(Data2). But the second part DoIP(Data2)/UDS(Data2) is treated as part of the payload for DoIP(Data1). Is this somehow possible?
Hi ! does anyone know why scapy cuts USB packets to 65535 bytes? i need read all packet data
I've tried with scapy.config.Conf.bufsize and RawPcapNgReader / read_packet(size=x), but without success
it always cuts the packet, but in wireshark I see that some it is bigger than 65535
That's probably the MTU
yep, but how could I change it? I'm reading the packages from a pcapng file
That's probably a bug; you should open an issue and attach a capture file
it seems a bug in 2.4.5 version, i just tested with 2.4.3 and it works well
So you should really open an issue :)
Hello, I want to write a script that take Two PCAP files to compare them by Packet (time, ip_source, ip_dest, port_source, port_dest, etc ..) and save the difference into another PCAP file. Any help ??
@trumpetsven You can create bytes to be sent like you showed with Scapy. It's currently not possible to dissect bytes you receive into this kind of structure. Is there a specification for such an application?
I have a large size PCAP file (about 12GB), can I parse it using Scapy ?
Is there a way to get DNSQR/DNSRR out of a DNS packate as a list?
You can try list(DNS(qd=DNSQR()/DNSQR()).qd.iterpayloads())
hi, maybe someone will have any ideas - when i'm trying to maipulate with RTP packets using scapy (e.g. change version or other header field) and then send them away, everything works, except Wireshark on the other end doesn't "see" those packets as RTP anymore, only as UDP. pkt.show() still shows those packets as RTP (on both sides).. What am I missing?
@polybassa At this time I got it working wth something like: ip/tcp/bytearray(raw(DoIP(Data1)/UDS(Data1)))/bytearray(raw(DoIP(Data2)/UDS(Data2))). This is probably defined in ISO 14229-5, but do not have in handy now.
@MariMari7, you can use for pkt in PcapReader('datas.pcap'):, which allows to load a packet in memory only when it is needed and not to overload the memory with the complete capture.
Hey guys. Im actually implementing an ssh client/server in scapy with the automaton framework and i came across a problem. decrypting/enrypting/parsing ect works just fine until it comes to tcp fragmentation. i discovered the tcp_reassamble method but i dont get it 100% by now. My problem is that the "ssh packet length" is encrypted so there is no way to find if the data is segmentend or not. is there any way to pass the "decryptor" object with the meta data dictionary and decrypt the first chunk of a packet and extract the "ssh packet length"? And sometimes there are multiple "small" ssh packets encrypted in one tcp payload this is kinda the contrary problem with that. i want the master_filter return the separatly. My solution so far is decrypting everything in the master_filter and overwrite the packet ref with the "big concatenated packet", but this only triggers the receive.conditions of my automaton once even if there are multiple packets returned. Is there any mechanism implemented to get the master_filter do return the sequentially or needs this to be implemented somewhere in the "scapy area" of my ssh definition? Greetings :)
the "decryptor" object ist part of the class which contains the automaton, so one "layer" above the actuall scapy ssh implementation
Hello. I'm new to scapy and in my learning I'm trying to simulate a vowifi request which includes ipsec (isakmp/esp) toward ePDG then a sip register toward ims. Currently I'm struggling on the first "ike_sa_init initiator request" where I'm not able to add multiple transform proposal to the security association payload. Do you think my objective is doable with scapy ? How is the ipsec implementation so far ? Is this the proper forum for these kind of requests or is there any better repository for more data/code exchange ?
The below screenshot is an attempt to derive packet configuration from a working pcap capture. Unfortunately scapy seems unable to inspect (or support) all different sublayers and just show the "load" field populated with the data I hoped to re-use as baseline in my python code...
I am trying to configure EDNS for a DNS packet with scapy. I need to craft specific sections for EDNS Opt0 based on RFC7871. See section 6 https://datatracker.ietf.org/doc/html/rfc7871 I read though this documentation https://scapy.readthedocs.io/en/latest/api/scapy.layers.dns.html The "Display RFC-like schema" for class scapy.layers.dns.DNSRROPT(args, *kargs) does not seem to resemble this structure. Notice that RFC7871 references RFC6891 in section 6 Is there a way to adjust scapy to send Option: Padding, and Option: CSUBNET - client subnet sections?
Plans to incorporate this into Scapy? or am I missing something
I'm starting to learn about the HDLC protocol and have a question about how it's implemented in Scapy. I see the address and control fields are defined, but not the Flag or FCS/CRC fields. How are those fields accounted for/handled in Scapy? Thanks.
@davehouser1 we have the basic EDNS0TLV RR, but you will need to do the encoding/decoding yourself. Feel free to submit a PR.
Hello, I am doing some experiments with IPsec and would like to decrypt the IKE_AUTH and INFORMATIONAL IKEv2 messages. I have access to the all the keys necessary, SK_e(i,r) and SK_a(i,r) and SPIs but am not sure this is even possible with scapy. Does anyone know if I can do this with scapy? Is there an alternative, if not? Thanks
scapy sniffing less packets than wireshark
I use a sleep() function to simulate the time spent processing tasks in callback function.
both scapy and wireshark start at the same time
Obviously see scapy cautions less packet than wireshark . How can I catch all packets using scapy without any packet loss
Scapy cannot match wireshark performance. To perform a fair comparison, you should replace the sleep call, by printing the packet summary.
hi ! i try to snif HTTP request behind nginx for example my app working on port 3000 behind nginx on 443 and 80 . i try to bind 3000 to HTTP , thats working when i try to accesss 3000 but when i try to use port 80 or 443 I can't see requests between nginx and my app on port 3000 .