Hallo, how it is possible to get information form connected socket. I need to get address of server, the socket is connected to and port. Is this possible to get?
I need to figure it out in WSPSend, to block it or not. So i cant remember it form previous actions(like socket(),connect() etc..)
thx.
getpeername
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im new in mikrotik, please help
all device connected is blocked from internet
so, i want to send http post from web page to mikrotik with data ip & macAddress
then the mikrotik make this ip+macAddress can connect to internet
is that can be happen in mikrotik?
or maybe any option for that, thank you.
This strongly depends on how do you block users from accessing outside network.
Since you mentioned client IP a MAC address my guess is Hotspot. If I'm correct then THIS would be your way
We are trying to create a simulation script where we need to send TCP packet data to the server in way that it appears to be coming from different IP every time.
Basically we need to emulate multiple devices ( with different IP) which are constantly sending data to the server.
The server creates a new connection only for request coming in from a new IP.
What is the best possible way to achieve it ? Is there a way of using proxy servers or some sort of virtualization to accomplish this ?
What you want to use is IP aliasing. This allows you to create virtual network interfaces. Each virtual interface can have one or more IP addresses assigned to it.
This link shows how to do it in Linux.
This link shows how to do it in Windows.
Next your clients need to specify which of your addresses to use. Use getifaddrs() to enumerate the available addresses. Then use the bind() system call on the socket before you do a connect(). This way you can have multiple clients and each one will use a different source IP address. This post has the details.
I'm using zeromq to develop a dynamic application which operate like upnp protocol( autoconfiguration and auto-discovery of equipment on a living room).
To do it so, i use zeromq to distribute messages, my problem is that when i create a socket and binding on a adress "169.254.1.0 through 169.254.254.255", I receive a error messages like this: ZMQError: Cannot assign requested address.
I've tried to figure out why by changing the address by local adress (127.0.0.1),and it's works !!.
The problem is that i'm implementing autoip, it's means that i'm oblliged to use the adresse on range 169.254.1.0 through 169.254.254.255.
Thanks in advance for your help!
I got this error, too... and I realized I had the wrong idea of who was connecting to whom in the PUB/SUB model.
This was working: Host A as the ZMQ PUB, and could easily connect with Host A as the ZMQ SUB.
Then I tried to set up Host B as the SUB, and have Host A "send" to that... and I kept getting this error. After all don't you need to tell the PUB where to send the data?
No! Host A as the PUB should still bind to IP_ANY (0.0.0.0); it is Host B as the SUB who has to be configured with the address of Host A.
Once I got that straight in my code (and in my head), I was up and running.
After you bring the interface up, you need to get its IP address and then bind on that. Alternatively you may be able to bind on "*", meaning all interfaces.
I discovered almost accidentally that my machine was sending and receiving UDP packets to a machine in Poland. Not that I have any problem with Poland, I just don't know why my laptop has the need to communicate with a server there. Reverse DNS shows just the ISP providing the address to some end user. Using Wireshark, I can monitor the messages, which were indecipherable as they were probably encrypted. All packets sent from my machine had the same source port, so clearly the application that sent them opened this UDP socket to use it. I am searching for ways to:
1) enumerate all current sockets open in the system, including the process that created it and, for both TCP and UDP, what ports and addresses they are current bound to.
2) because applications can open these sockets, use them, and close them right away, I would love to find (or perhaps even write) a program that once started would somehow get notification each time a socket gets created, or really more importantly when bound to a source and/or destination address and port. For UDP, I would love to also be able to monitor/keep track of the destination IP addresses and ports that socket has sent messages to.
I don't want to monitor the traffic itself, I have Wireshark if I want to view the traffic. I want to be able to then cross reference to discover what application is generating the packets. I want to know if it is from a process I trust, or if it is something I need to investigate further.
Does anybody know of any applications (for the Windows platform) that can do this? If not, any ideas about a .NET or Windows API that provides this capability, should I want to write it myself?
Edit:
After further research - looks like the APIs to use are GetExtendedUdpTable and GetExtendedTcpTable, CodeProject.com has some samples wrapping these in .NET (see http://www.codeproject.com/Articles/14423/Getting-the-active-TCP-UDP-connections-using-the-G). So a combination of this API and some sniffer code would be needed to monitor and keep track of what hosts at what ports using what protocol any particular application on your machine is talking to. If I ever get some free time, I'll consider creating this, if you know of an app that does all this, please let me know.
Try SysInternals TCPView. Despite its name, it handles UDP as well.
netstat -b to enumerate all ports along with the process names.
You can try using SysInternals' Process MOnitor (ProcMon.exe or ProcMon64.exe).
It allows for filtering of Processes by "UDP Send" Operation - and provides detailed UDP Connection data, including source and destination addresses(IP) and ports etc.
In order to receive datagrams through an UDP connection I have created an object of type UDPClient.
receivedNotificationSock = new UdpClient();
However once done and on using the receive method:
receivedHostNameBuffer=receivedNotificationSock.Receive(ref receivedNotificationIP);
I am getting an exception saying that I must call the bind method.
But there is no bind method in the UDPClient class.
Could You guys please provide me with the code if possible as to what should be done to overcome this exception.
You need I think to know some more about sockets.
All sockets possess a port number. First, you create a socket - which is almost useless on its own. It just floats there. But then you bind it - you assign it a port number. Now it's useful - now you can send and receive data on it.
Remember, all UDP communications are defined by the quad data set of the IP and port of the source and the IP and port of the destination. A freshly created socket doesn't have an IP address or port; binding gives it an IP address and port.
Unfortunately, I'm not a C# programmer, so I can't properly answer your question. But at least you know why it's important.
Pass the port number into the constructor of your UDP client.
receivedNotificationSock = new UdpClient(21000);
You may need to change firewall settings to allow the bind, though a popup window normally opens when you first run this on your dev machine.
For Socket proramming you need to know the sequence of syscalls you need to do on client side and on the server side.
If you are writting a client :
you open a socket with a socket call.
you then connect to the server port with a connect call
once connect is successful
then you send the request to the server using either a send or sendto or a write
which results in reception of data that you can read using a receive or read
On Server Side
you create a socket
bind it to a port
start listening on the socket for incoming connections from various clients using a listen.
There is a non blocking way of listening for connections as well with a select syscall.
Once the you establish a connection you can essentially read the request and start processing it.
Here's an example in C# that may be useful to you.
http://www.developerfusion.com/article/3918/socket-programming-in-c-part-1/