packet

问题 I have a trouble, my server application sends packet 8 bytes length - AABBCC1122334455 but my application receives this packet in two parts AABBCC1122 and 334455 , via "recv" function, how can i fix that? Thanks! 回答1: To sum up a liitle bit: TCP connection doesn't operate with packets or messages on the application level, you're dealing with stream of bytes . From this point of view it's similar to writing and reading from a file. Both send and recv can send and receive less data than

问题 I am currently working on a program that takes a .pcap file and separates all of the packets out by ip using the scapy package. I want to decompress the payloads that are compressed using the gzip package. I can tell if the payload is gzipped because it contains Content-Encoding: gzip I am trying to use fileStream = StringIO.StringIO(payload) gzipper = gzip.GzipFile(fileobj=fileStream) data = gzipper.read() to decompress the payload, where payload = str(pkt[TCP].payload) When I try to do this

问题 In C if you have a certain type of packet, what you generally do is define some struct and cast the char * into a pointer to the struct. After this you have direct programmatic access to all data fields in the network packet. Like so : struct rdp_header { int version; char serverId[20]; }; When you get a network packet you can do the following quickly : char * packet; // receive packet rdp_header * pckt = (rdp_header * packet); printf("Servername : %20.20s\n", pckt.serverId); This technique

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 7 years ago . Here's the problem, it's very simple (to understand..): I have 2 computers at home, they both have the same public IP address (e.g. 1.2.3.4). I have 1 computer at a coffee place (different network) so it has a different public IP address. I want to send a message (e.g. "hi") from the computer at the coffee place

问题 In a project I have multiple senders of UDP data, but only a single receiver. If traffic gets higher, the receiver "forgets" lots of packets. I know that this is a problem inherent to UDP, but I want to minimize the number of lost packets. I have read this SO question before! Here is my code (Please excuse the massive code blocks, but I wanted the example to be self contained) Sender side: public class UdpSender { private static int portNumber = 15000; public void Send(string data) { var

问题 I'm looking to create what I call a proxy, although that definition is probably somewhat inaccurate. Typically, you have something like this: Client --------- Server What I want to do is introduce a proxy, without a new layer, like this: Client ----+---- Server | Proxy I do not want this: Client---Proxy---Server I understand that WinPCap does something similar to this, but it's an under documented subject as far as I can see. So far I've tried a few things, most notably listening on the same

问题 I'm very confused in when to use ntohs and ntohl. I know when you use ntohs for uint16_t and ntohl uint32_t. But what about those with unsigned int or those where a specific amount of bits is specified (e.g. u_int16_t doff:4;). Here is my working code to demostrate the issue: // Utility/Debugging method for dumping raw packet data void dump(const unsigned char *data, int length) { unsigned int i; static unsigned long pcount = 0; // Decode Packet Header struct ether_header *eth_header =

问题 I'm trying to learn some of the ins and outs of P2P/decentralized networks. My question is the following. Say I have two machines named comp1 and comp2. Now comp1 is setup on my home network behind a router, and comp2 is located in my office at also behind a router. Is it possible for me to send UDP packets back and forth across the Internet like this assuming of course that ports are forwarded properly? To offer more insight on what I'm investigating, I'm trying to figure out how a new node

问题 Using .NET, how can I listen to udp broadcast packets sent to .255 on any port without the need of binding to a specific port? 回答1: I found a way myself. This is how it works: mainSocket = new Socket(AddressFamily.InterNetwork, SocketType.Raw, ProtocolType.IP); mainSocket.Bind(new IPEndPoint(IPAddress.Parse("192.168.0.1"), 0)); mainSocket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.HeaderIncluded, true); byte[] byTrue = new byte[4] { 1, 0, 0, 0 }; byte[] byOut = new byte[4] { 1, 0,

问题 I want to send a raw http packet to a webserver and recieve its response but i cant find out a way to do it. im inexperianced with sockets and every link i find uses sockets to send udp packets. any help would be great. 回答1: Take a look at this simple example from the fsockopen manual page: <?php $fp = fsockopen("www.example.com", 80, $errno, $errstr, 30); if (!$fp) { echo "$errstr ($errno)<br />\n"; } else { $out = "GET / HTTP/1.1\r\n"; $out .= "Host: www.example.com\r\n"; $out .=