My Script basically looks like this i am getting an error, like this This means that python can’t resolve that particular host, if i remove the http:// and leave it as goal.com or make that request through my browser, it’s just fine and the script and the browser don’t throw any errors, one …
Tag: sockets
Connection refused – tcp socket in linux [closed]
Closed. This question needs debugging details. It is not currently accepting answers. Edit the question to include desired behavior, a specific problem or error, and the shortest code necessary to reproduce the problem. This will help others answer the question. Closed 7 years ago. Improve this question Ok, f…
Get struct socket*, struct sock * from socket descriptor in a C program on Linux
I’m working on a C program on Linux (unprivileged). Is it possible to get a reference to struct socket or struct sock from the socket descriptor? Thank you. Answer If you’re working in user mode (eg. not kernel mode), you cannot directly manipulate kernel structures (including struct sock). If you…
`boost::asio` `async_resolve` hangs on Linux, what may be a reason?
I write complex TCP/IP client application that generates a lot of outgoing TCP connections. I try to use boost::asio as portable TCP/IP networking implementation in C++. I found following issue. See the code: This code runs background thread to execute io_service::run method. It is supposed that we’ll h…
Raw Sockets in C
1. The linux manual page says about this code. In socket option, if IP_HDRINCL is set, I can make IP header. Am I right? If it’s right, above socket also let me make TCP header, too? Then, if IP_HDRINCL is not set, what means above socket? 2. what means above code comparing to number 1 question’s …
Detect client is disconnected
I have a simple program that listens to a socket. Everything goes fine except when the connection is lost in while(1) cycle. In this case the program falls into read from socket for many times without result. How can I detect a disconnected client in while(1) cycle? Answer Change: To: Also, your code mishandl…
errno.h socket/connection error classification
I’m using boost::asio on linux to send http request, using almost exactly this code boost asio http I want to catch exceptions and classify them using errno.h error codes to three groups GROUP 1. errors occurred because of local host socket/connection. GROUP 2. errors occurred because of local host or r…
Attempting to send TCP SYN packet with data and RST with data, but raw data field disappears in transit. Why?
I’m attempting to craft a raw TCP packet to send over Ether in a raw socket on a linux client and server. The special part of the TCP packet is that I’m attempting to use the raw data field of the TCP SYN packet and RST packet to send data back and forth (for a proof of concept about an
Is libpcap implemented by socket API?
libpcap is used for package capturing. As I understand, it can capture the network packages from all ports. And it can capture the package data in link layer (such as ethernet frame). This looks a little confusing to me, because it seems impossible to intercept all network traffic (from all ports) by just usi…
Merged Socket->recv with perl on Linux
Sorry for the bad English, it is not my mother tongue. I am new to perl programming and I’m facing a tedious problem for some hours now. I have coded a simple Client-Server using IO::Socket::INET. It works flawlessly on Windows, but is broken on Linux. On Linux, the first recv get both of server’s…