raw-sockets

问题 RAW Socket: How to filter packets in RAW Socket ? I was trying to capture UDP packets in a server Program but its receiving all the packets. Is there any function or command to filter the packets in linux. 回答1: Use LSF/BPF (see https://www.kernel.org/doc/Documentation/networking/filter.txt an http://www.freebsd.org/cgi/man.cgi?query=bpf&sektion=4) or for a higher-level interface, pcap 回答2: #include <sys/socket.h> #include <netinet/in.h> raw_socket = socket(AF_INET, SOCK_RAW, int protocol);

问题 I have written a programm running on Ubuntu LTE that should send an Multicast-Message to 239.255.25.25 Port 5004 using a raw socket. To receive the Multicast, I am using an UDP Socket. The data to send via the socket was captured with wireshark from an rtp stream. The Problem is now, that I am not able to receive the Message with an UDP Socket. For checking if the receiver is correct, I had built an Sender, which is using an normal UDP Socket. When I am now sending the same message via RAW

问题 i am trying adding my own customized layer 4 protocol in linux (ubuntu 14.04) - IPPROTO_MYPROTO as a loadable kernel module. I have done all necessary steps to register the protocol. Here i am sharing my code. When i am trying to send a mesage from user space program using sendmsg() , i expect the corresponding fn myproto_sendmsg() registered via struct proto structure should be called in kernel space. But what i am observing is that though the myproto_sendmsg() in kernel space is not being

问题 How to bind a raw socket to a specific interface using python in linux centOS? I have multiple interfaces like eth0, eth0:1, eth0:2,etc 回答1: You can do it by using the IP address that corresponds to the desired interface. import socket s = socket.socket() s.bind(('192.168.1.100', 12345)) s = socket.socket() s.bind(('localhost', 12345)) s = socket.socket() s.bind(('0.0.0.0', 12345)) The first two above would bind to the interface with that IP address. The last one will bind to any interface.

问题 I googled for a while and read related questions here about sending and receiving through sockets, but couldn't find an answer to my question: Can I send and receive packets through different sockets? I would like to implement something like this: HOST='127.0.0.1' PORT=10000 recvSock = socket.socket(socket.AF_INET, socket.SOCK_RAW, socket.IPPROTO_RAW) sendSock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) sendSock.sendto("",(HOST,PORT)) response,addr = recvSock.recvfrom(65535) Basically,

问题 I have this simple client code which is sending a message to a server and then echoes the server response. import socket, sys, time HOST = 'localhost' PORT = 11000 s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect((HOST, PORT)) msg = raw_input() s.send(msg) data = s.recv(len(msg)) s.close() print 'Received: ', data I wish to use raw socket here in order to be able to get the IP_ID field out of the server's response packet, but I have no idea how. No matter how much I read about

问题 Background I'm trying to mmap() the RX ring buffer of a raw socket in my 64-bit Linux application. My ring consists of 4096 blocks of size 1MB each for a total of 4GB. (Note there can be many frames in each 1MB block. See this doc for background if you're curious.) Problem Unfortunately, there appears to be a 4GB limit on the size of the RX ring buffer when configuring it using setsockopt() with option PACKET_RX_RING . The implication for me is that I cannot increase either my block size or

问题 I'm trying to create a raw socket using Ruby. The problem is, there isn't anything called "raw socket" there and, on the other hand, the Socket class itself is not fully documented. Does anybody have some code samples for that kind of socket in Ruby, or maybe some kind of a documentation for that? By the way, I already know how to work with TCPSocket and TCPServer classes, and what I need is particularly a raw socket. 回答1: Google brings up the following result: http://www.ruby-forum.com/topic

问题 I'm trying to send a custom IPv6 header through a RAW socket in C Linux. I already succeded in IPv4 using the IP_HDRINCL socket option, however, there's not an equivalent for IPv6. I found a workaround here suggesting to use socket(AF_INET6, SOCK_RAW, IPPROTO_RAW) to have the same effect as enabling the IP_HDRINCL socket option. The socket is created successfully and I'm not getting any error until I use the sendto function with my modified header. I setup the socket like this: static int

问题 i am using raw sockets to create my own socket. i need to set the tcp_checksum. i have tried a lot of references but all are not working (i am using wireshark for testing). could you help me please. by the way, i read somewhere that if you set tcp_checksum=0. then the hardware will calculate the checksum automatically for you. is this true? i tried it, but in wireshark the tcp_checksum gives a value of 0X000 and says tcp offload. i also read about tcp offloading, and didn't understand, is it