C++ :: Packets And Tcp Simulation?
Nov 24, 2014
I have to write a program to take packets of information destined for certain ports then provide the current message using the packets I've gotten so far. Packets can come out of order, so when asked for the message, packets that haven't arrived yet are skipped and the next packet is appended. After giving the message, I have to delete all the current packets as well as ones that are received late, after the packets that were supposed come after the late packet were already provided in the message.
Data:Up to 1000 ports, numbered 0-64000, and each message can contain up to 1000 packets.
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Jun 2, 2013
I'm trying to get a UDP server working and just can't seem to get it to read in any UDP packets. I can see the packet coming in on the correct interface and port from tcpdump, but my program never logs that it got the data.
I just keep getting a log showing that my recvfrom timed out. I'm pretty sure I'm setting everything up correctly.
Code:
int create_listen_socket() {
struct sockaddr_in si_me;
int sock_fd;
struct ifaddrs * ifAddrStruct=NULL;
struct ifaddrs * ifa=NULL;
void * tmpAddrPtr=NULL;
struct timeval tv;
[Code] ....
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Jan 10, 2015
create BOT that adds friends on one of Chat websites.
Im using C#
On website there is a button that adds user to friends
<li class="friend"><a href="javascript:void(0)">Add Friend</a></li>
I captured packet that is sended to server then that button is clicked
POST (info hided)/amfgateway.php HTTP/1.1Host: (info hided)
Connection: keep-alive
Content-Length: 52
[Code].....
It apears that this is AMF(Action Message Format) type packet Content-Type: application/x-amf it is in binary and this complicates things a little because I cannot send it with regular httpwebreqeuest class(Or I think so)
I used Fiddler4 with AMF plugin to check what data was passed with that packet
It apears that these numbers under content / 0 are User-id that is needed to add user to friends
I did a research with little success finding any usefull examples. I just found that there is a library for FLEX/FLASH remoting called fluorinefx and this should do the job but when I opened documentation it seems little too complex for me.
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Jul 18, 2014
I am receiving packets of data from an ethernet cable. This is the line of code that is streaming in data from the ethernet cable:
size_t num_rx_samps = rx_stream->recv(&buff.front(), buff.size(), md, 3.0, enable_size_map);[code]
Here are the segments of me trying to push the packets onto a vector:
[code]
std::vector<size_t> processing_queue; //HERE IS WHERE I'M TRYING TO PUSH THE PACKETS ONTO A VECTOR
processing_queue.push_back(num_rx_samps);
[code]
I previously had my program saving to a .dat file (the commented out lines), but I need to change it to pushing values onto a vector so I can stream the data packets from the ethernet cable to be processed. However, the packets aren't being pushed onto the stack as I suspected. What do I need to change to push the data packets onto a vector? The following is the code:
[code]
#include <uhd/types/tune_request.hpp>
#include <uhd/utils/thread_priority.hpp>
#include <uhd/utils/safe_main.hpp>
#include <uhd/usrp/multi_usrp.hpp>
#include <uhd/exception.hpp>
#include <boost/program_options.hpp>
[code]....
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Jul 22, 2012
I have a simple UDP client that should be able to send and receive packets. It does its job, however if there are no packets received for a while it stops listening for any new packets and I'm not sure what's causing it.
This is my code:
#define WIN32_LEAN_AND_MEAN
#include "Client.h"
#include <winsock2.h>
#include <ws2tcpip.h>
#include <vector>
#include <sstream>
#pragma comment(lib, "Ws2_32.lib")
[Code] ....
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Sep 26, 2014
how to write a "charge simulation method" program in C or C++? It's to calculate electric distribution and also electric potential of two different dielectrics. I have attached the diagram of the shape of the electrode that needs to be investigated.
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Feb 1, 2015
Here is the assignment I get:
Write an email simulator that processes mail at an average of 40 messages per minute. As messages are received, they are placed in a queue.assume that the messages arrive at an average rate of 30 messages per minute.messages must arrive randomly.
Each minute, you can dequeue up to 40 messages and send them. Assume that 25% of the messages in the queue cannot be sent in any processing cycle.use a random number to determine whether a given message can be sent. If it can't be sent, enqueue it.
Run the simulation for 24 hours, At the end of the simulation, print the statistics that show:
-The total messages processed.
-The average arrival rate.
-The average number of messages sent per minute.
-The average number of messages in queue in a minute.
-The number of messages sent on the first attempt, the number sent on the second attempt, and so forth.
-The average number of times messages had to be requeued (do not include the messages sent the first time in this average)
Well, actually I've done a part of the coding. But how to continue it. And here is my code :
#include <iostream>
using namespace std;
#define SIZE 40
class Queue {
int queue[SIZE];
int head, tail;
public:
Queue();
void Enq(int num);
[code]....
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Feb 5, 2015
I have a requirement to sniff the wifi packets. There are examples available which does the sniffing using pcap functionality. I need a C program which will sniff the wifi packets without using pcap functionality..
Code:
#include<pcap.h>
#include<stdio.h>
#include<stdlib.h> // for exit()
[Code].....
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Jan 30, 2015
There is something I didn't understand. I use the sample given from the cpp reference to generate numbers:
const int nrolls = 10; // number of experiments
std::default_random_engine generator;
std::poisson_distribution<int> distribution(4.1);
for (int i=0; i<nrolls; ++i){
int number = distribution(generator);
cout<<number<<" "<<endl;
}
(original code: [URL] ... )
This outputs: 2 3 1 4 3 4 4 3 2 3 and so on... First of all what those numbers mean? I mean do I have to sum them to create timing? For example: 2, (2+3)=5, (5+1)=6, (6+4)=10,..., and so on..
Secondly, my real question is, I need to produce both random arrivals for network packets and the size of packets. I mean, when the packets come and if packets come, what are the size of packets? How can I do that? I need something like that: [URL] ...
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Jul 17, 2014
I am receiving packets of data from an ethernet cable. This is the line of code that is streaming in data from the ethernet cable:
size_t num_rx_samps = rx_stream->recv(&buff.front(), buff.size(), md, 3.0, enable_size_map);
and here is my attempt to push it onto a vector:
std::vector<size_t> processing_queue; //HERE IS WHERE I'M TRYING TO PUSH THE PACKETS ONTO A VECTOR
processing_queue.push_back(num_rx_samps);
I previously had my program saving to a .dat file (the commented out lines), but I'm trying to change it to pushing values onto a vector so I can stream the data packets from the ethernet cable to be processed. However, I'm having issues with pushing the data packets onto the vector?
The following is the code:
#include <uhd/types/tune_request.hpp>
#include <uhd/utils/thread_priority.hpp>
#include <uhd/utils/safe_main.hpp>
[Code].....
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Jan 25, 2013
My Project is to Dynamically Link 2 Software for Co-simulation n C/C++. So that Output of One Software becomes Input of Other automatically . at present we input the parameters manually in both the software . what to do so that it pick up values itself and gives the output by solving each and everything at once in both the software .
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Jan 23, 2013
I have to simulate flash memory using C++ for a project.
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Oct 30, 2013
I'm trying to create program that reads in commands from an input file, and accordingly creates, connects or destroys logic gate primitives (and gates, or gates). Additionally, I'm trying to modify a previous program that I wrote to do this using QThreads, where each gate is placed in its own QThread. I'm trying to avoid using invokemethod, and I'm sure this method can work. My specific issue that I'm having trouble debugging is in my connect code block in main.cpp. Whenever I try to reference a gate specified by the input file that is NOT the true or false gate (I have one of each and they are attached to any gate that needs a true or false input), I get only a NULL reference. This includes attempting to reference the gate in my gatelist QMap. Calling gatelist.value(newCommand.at(1)) causes the program to hang, and the connect statements referencing said gate return errors about connecting a signal or slot of a NULL pointer.
Here is main.cpp:
#include <QPointer>
#include <QMap>
#include <QDebug>
#include <QString>
#include <QFile>
#include <QTextStream>
[Code] ...
My accompanying class declarations can be found here : [URL] ....
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Feb 11, 2013
How do i define user and lottery..
//Declarations
#include <iostream>
#include <cstdlib>
#include <ctime>
const int lotteryDigits = 10;
const int SIZE = 5;
const int Power = 1;
int generateLottery(int[], int, int);
[Code] ....
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Feb 17, 2014
Anyhow, I have a program due Wednesday that is along the lines of the classic Bank Teller simulation using Queue's.
Unlike most of these programs, I have to integrate my own Queue, QueueNode, Teller, and Customer classes. I have attached all of these headers below plus the main file.
Now the error: While I'm sure there are other issues with the code, it will not let me create a new customerQueue (of Queue type) object as such:
Queue<Customer> customerQueue;
The error it is giving me is:
no matching constructor for initialization of 'Queue<Customer>'
Here is my code:
Queue.h:
#ifndef QUEUE2_H_
#define QUEUE2_H_
#include <iostream>
#include "Teller.h"
#include "Queue.h"
[Code] ....
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Apr 25, 2013
I'm currently working on a simulation of the motion of magnets on a rod. As part of it, there are arrays of the properties of the magnets:
long double *accelerations; // These will later be dynamically allocated depending on the number
long double *velocities; // of magnets
long double *positions;
However, when I go to compile this, the compiler gives me these error for the pointers:
error: two or more data types in declaration of 'accelerations'
error: two or more data types in declaration of 'velocities'
error: two or more data types in declaration of 'positions'
Apparently, the compiler isn't recognising long double* as a type and is instead reading is as the two types long and double*.
My compiler is MinGW 4.4.3
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Sep 5, 2014
I'm supposed to build a banking simulation program around the BankAcct class, which provides the following service: create new account with unique account number (maximum 5 accounts created in a single test running); deposit/withdraw; print information of all existing account. I was running a test program with only 2 services first, namely creating new account and depositing, but the program just keep on crashing and I couldn't figure out why.
#include <iostream>
#include <sstream>
#include <string>
using namespace std;
[Code].....
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May 28, 2013
I wrote this simplified version of a program i am writing that parses data in UDP packets. In the process of doing so i pretty much answered all my questions and fix all the problems i was having.
decodeSystemMap function will be in loop, and will proccess packets that have mostly the same data, only a few items will be added or changed or deleted.
whats the best way to check if there are any new, deleted, or removed items in the packet and only modify those?
Is there anything unsafe / dangrous about the way the code is now?
Code:
/* * File: main.c
* Author: david
*
* Created on May 23, 2013, 11:57 AM
*/
#include <stdio.h>
#include <stdlib.h>
[Code] ....
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