packet | : package : Send network packets over a TCP or UDP connection | TCP library
kandi X-RAY | packet Summary
kandi X-RAY | packet Summary
Send network packets over a TCP or UDP connection.
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Top functions reviewed by kandi - BETA
- NewStream returns a new Stream .
- SetConnection sets the connection
- New returns a new packet
- Int64FromBytes converts a byte array to a int64
- Int64ToBytes converts int64 to bytes
packet Key Features
packet Examples and Code Snippets
// Connect to a server
conn, _ := net.Dial("tcp", "localhost:7000")
// Create a stream
stream := packet.NewStream(1024)
stream.SetConnection(conn)
// Send a message
stream.Outgoing <- packet.New(0, []byte("ping"))
// Receive message
msg := <
// Close server connection to simulate server death
server.Close()
// Send packet while server is down (will be buffered until it reconnects)
client.Outgoing <- packet.New(0, []byte("ping"))
// Reconnect
newServer, _ := net.Dial("tcp", "localhos
Community Discussions
Trending Discussions on packet
QUESTION
I have to do an exercise were I got h.264 video sender host, h.264 video receiver (with background traffic receiver) host, and a background traffic generator host. All of these three are on different ip subnet connected to P4 controller.
...ANSWER
Answered 2021-Jun-15 at 17:48Yes I can see what you mean, I have done this integration before you only forget the priority statement otherwise should run well, please add this to your code;
after
apply { ipv4_lpm.apply();
ADD:
QUESTION
I have an app that communicates with a bluetooth device, and I'm trying to replace that app with some code.
I tried using C# InTheHand nuget, Microsoft's Bluetooth LE Explorer, python's sockets and others to send data and see what happens.
But there's something I still don't understand - in each way using different libraries I saw in wireshark a different protocol: ATT, RFCOMM, L2CAP...
When I sniffed my bluetooth traffic from my phone using the app mentioned before, I saw mostly HCI_CMD protocol traffic.
How can I choose the protocol I want to send? Is there a simple package for that? something to read?
Do I need to build the packet myself? including headers and such?
Thank you!
Update:
Using Microsoft's Bluetooth LE Explorer I was able to send a packet that lit up my lamp, starting with 02010e10000c00040012(data)
Using bleak I was able to send a packet starting with 02010e10000c00040052(data)
the difference makes the lamp not ligh up and I'm not sure if I can change it via bleak as it's not part of the data I send
ANSWER
Answered 2021-Jun-14 at 18:48I think what you are showing is that bleak does a write without response
while MS BLE Explorer does a write_with_response
.
Looking at the Bleak documentation for write_gatt_char
that seems to be consistent as response
is False
by default
write_gatt_char Parameters:
char_specifier (BleakGATTCharacteristic, int, str or UUID). The characteristic to write to, specified by either integer handle, UUID or directly by the BleakGATTCharacteristic object representing it.
data (bytes or bytearray) – The data to send.
response (bool) – If write-with-response operation should be done. Defaults to False.
I would expect the following to have the desired effect:
QUESTION
I just have an try-catch sentence in a multiplayer project in Unity. It basically tries to connect to the server in the try, and the catch is for getting the exception in case it can't connect. My problem is that im trying to pop a message error via the UI when the exception throws, but the code I used in the catch block is not working. In the code below im trying to show the UI with the LogError. Thanks in advance.
...ANSWER
Answered 2021-Jun-07 at 20:38Pretty sure the issue is that this call comes in async so on a different Thread/Task.
Most of Unity API can only be used on the Unity main thread. (Only exception are basically all pure mathematical structs that do not directly influence or rely on the scene.)
Most of the time this is solved via a so called "Main Thread Dispatcher". It looks somewhat like e.g.
QUESTION
Say I have a function,
...ANSWER
Answered 2021-Jun-14 at 09:40It does not matter. The function total
will not be probably inlined (normal function call will be emitted). Function res
probably will be inlined.
Why probably. Because the inline
keyword is only a suggestion. Functions without inline may be inlined as well. The compiler may inline the total
function as well if decides that on a certain level of optimization it will result in the best code generation.
Many compilers have special extensions which give you control over inlining. for example:
gcc has __attribute__((noinline))
and __attribute__((always_inline))
.
iar #pragma inline=never
and pragma inline=force
QUESTION
Note: I'm new to network and dpdk, so there might be some misunderstanding in fundamental concepts...
I want to run 2 instances of dpdk-testpmd
on the same host to send and receive traffic over separate NIC.
Configuration:
NIC:
- PMD: MLX5
- version: 5.0-1.0.0.0
- firmware-version: 16.26.1040 (MT_0000000011)
- NUMA-Socket: same
- PCIe: 0000:3b:00.0, 0000:3b:00.1
Update
- DPDK Version: 20.11.1
- Hugepage Total: 32768
- Hugepage Free: 32768
TESTPMD Logs:
...ANSWER
Answered 2021-Jun-13 at 05:04Note: I highly recommend reading about dpdk testpmd as it covered all your questions in detail. As per the StackOverflow guideline multiple sub-questions make answering difficult. Please use well-formatted and formed question for better reach and answers.
@Alexcured since you have mentioned you know how to run 2 separate instances of dpdk-testpmd
. I will only recommend heavily reading up on dpdk-testpmd URL which has answers to most of your questions too.
The assumption is made, both the PCIe NIC are working properly and interconnect between 2 are tested with either arping or ping (Kernel Driver). After binding both PCIe devices to DPDK supported drivers, one should use options for DPDK 20.11.1 such as
- use file-prefix option as unique names
- set socket-memory to fetch memory from the desired NUMA-SOCKET
- set socket-limit to prevent ballooning of huge page mmap
- use w|b option to whitelist|blacklist PCIe devices (0000:3b:00.0 and 0000:3b:00.1)
- Since it is separate physical devices ensure there physical cable connection between 2 PCIe ports.
[Q.1] How to set the MAC address of instance 2's port in instance 1?
QUESTION
Desired outcome: Assign role to a user who reacts to message in channel. On bot restart the message if not in cache, therefore user is not assigned role.
Issue: Code stops responding after guildID = client.guilds.get(packet.d.guild_id);
client has been defined at the start of the script.
Expected output: Returns guildID and adds the role to the user who reacted.
Followed this guide
...ANSWER
Answered 2021-Jun-11 at 03:21Try to using these alternative way to use
And guildID = client.guilds.get(packet.d.guild_id);
this wrong way to get guild
since discord.js v12 updated it will be guildID = client.guilds.cache.get(packet.d.guild_id);
QUESTION
I'm using FastAPI and I need to represent different STIX 2 objects (from MITRE ATT&CK) with a corresponding/equivalent Pydantic model in order to return them as a response JSON.
Let's consider the AttackPattern object.
...ANSWER
Answered 2021-Jun-11 at 08:46A possible and promising approach is to generate the Pydantic model starting from the corresponding JSON Schema of the STIX object.
Luckily enough the JSON schemas for all the STIX 2 objects have been defined by the OASIS Open organization on the GitHub repository CTI-STIX2-JSON-Schemas.
In particular, the JSON Schema for the Attack-Pattern is available here.
QUESTION
I am using Django with RDS along with Aptible deployement. I started receiving lots (2027, 'Malformed packet')
for a while but when I run the same query using Django "shell" OR "dbshell" then the query works fine.
I am not able to find any lead around that, found some articles/answers but now one could help.
...ANSWER
Answered 2021-Jun-10 at 21:54Try by disabling query-caching on MySQL if it works. There is a bug reported in MySQL with MySQL-client and MySQL-server versions reported here. Usually, Malformed Packet error occurs when the MySQL client can't understand the packets sent by the MySQL server.
In our case, we were hitting the same MySQL Server (DB) from two different client machines with different versions of the MySQL client. So, with query-caching enabled, whenever we were running the same query with both of the client machines, we were getting this error.
Both of these solutions worked for us:-
- Disabling the query-caching.
- By installing the same MySQL-client version on both of the client machines (now it worked with query-caching enabled as well).
QUESTION
I was trying to understand the iphdr struct and I don't understand what src and dest represent. For instance I have a packet sniffer that takes the packet and passes it into an iphdr struct. Running netcat with nc 127.0.0.1 7999
and nc -l 127.0.0.1 7999
I get the result 16777343 for the src and dest. Am I forgetting a conversion or something?
ANSWER
Answered 2021-Jun-10 at 16:291 * 256 * 256 * 256 + 127
is 16777343.
I think that demonstrates the needed conversion nicely.
It is close to the hexadecimal representation, just that each bytes value is then shown in decimal.
QUESTION
I'm working with a CyberPower PDU: https://www.cyberpowersystems.com/product/pdu/switched-ats/pdu15swhviec12atnet/
According to snmpwalk -v1 -m CyberPower_MIB_v2.9.MIB -c public 10.42.0.2 iso.3.6.1.4.1.3808
, the management card model is RMCARD205
and the full model name is PDU15SWHVIEC12ATNET
.
I would like to programmatically control the power to the ports, doing this via SNMP seems the most robust option. I can query the status of port 3 (say) with,
...ANSWER
Answered 2021-Jun-10 at 13:12I found the answer to my question and will post some details here, in case others are as confused as I was!
The first tip is to use the device manufacturers MIB files. CyberPower published a single MIB file (which is basically a textual description of all the properties in the hardware devices) that allows the net-snmp tools to print descriptive names for the otherwise opaque OIDs. For example, to see what I was attempting to set above, after downloading the MIB file into the current working directory,
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