I found more source codes which are working like ping. My only problem with them is, that if i run the program with a non administrative user, then i get back errorcode 10013 which means : "An attempt was made to access a socket in a way forbidden by its access permissions." If i run the program with a user which is member of the administrator goup then it's working fine.
nResult = sendto (sock, pSendBuffer, sizeof (ICMPheader) + nMessageSize, 0, (SOCKADDR *)&dest, sizeof (SOCKADDR_IN));
::GetSystemTime (&timeSend);
++nPacketsSent;
if (nResult == SOCKET_ERROR)
{
cerr << endl << "An error occured in sendto operation: " << "WSAGetLastError () = " << WSAGetLastError () << endl;
}
Can anyone help me to solve this problem, or tell me why can't a non administrator user use this code? If not, then i would appriciate some code, which i can use with a user which isn't member of the administrator group.
Thanks in advance!
kampi
If you want to implement ping functionality in your application on Windows, then you should have a look at the IcmpSendEcho2 function instead of trying to use raw sockets.
Is your socket of type SOCK_RAW? In that case this is by design:
RAW Socket Access Denied to Non-Admin Windows NT 4.0 and Windows 2000 Users
by any chance, is your code using a raw socket ? if this code really implements a PING request, then it should be using raw sockets.
due to security considerations (people that considered those considerations did not consider much, but that's for another post), raw sockets are only available for accounts which have administrator privileges.
Related
I am trying to implement gRPC server/ client for the first time using Windows Subsystem for Linux kernel and CLion as the IDE (on Windows). My code does not have any other bugs/ issues except this communication failure.
The following lines of code
if(status.ok()) {
cv::imshow("Rotated image", decrypt_img);
} else {
std::cout << status.error_code() << " : " << status.error_message() << std::endl;
}
yields the following message
14 : failed to connect to all addresses
This is a kind of generic error message from grpc which can have multiple causes.
In my experience, it can be one of the following things:
Your server isn't running (either you forgot to call grpc::ServerBuilder::BuildAndStart or you didn't start your server application all along).
When running the server for the first time Windows Firewall should ask you if you want to allow your application to access the network (I don't recall the actual wording). You want to accept this, of course.
You have a wrong address specified in your client application (i.e. a different one than you have set in your server application via grpc::ServerBuilder::AddListeningPort)
Not knowing your actual server and client code these are just assumptions I can make based on my experience with grpc.
I am trying to enable events for SIU device like this:
LPWFSRESULT lpWfsResult;
WFSSIUENABLE commandData;
commandData.fwSensors[WFS_SIU_OPERATORSWITCH] = WFS_SIU_ENABLE_EVENT;
commandData.fwIndicators[WFS_SIU_OPENCLOSE] = WFS_SIU_ENABLE_EVENT;
HRESULT hResult = WFSExecute(hService, WFS_CMD_SIU_ENABLE_EVENTS, &commandData, 10000, &lpWfsResult);
cout << "Events enabled?:" << hResult << endl;
WFSFreeResult(lpWfsResult);
This works as expected (hResult = 0) in one of the test ATMs.
However on another test ATM, this returns WFS_ERR_SIU_INVALID_PORT (-801).
As per the XFS doc, this means:
An attempt to set a port to a new value was invalid because the port does not exist or the port is pre-configured as an input port.
I don't really understand the document's description. Can someone explain why this status is returned and what should be done?
Thank you.
I think you need to initialize WFSSIUENABLE struct before WFSExecute. You are only setting values for Operator Switch and Open/close, but what about the others? Try to do a memset to set all the others to zero (WFS_SIU_NO_CHANGE):
memset( commandData, 0, sizeof( WFSSIUENABLE));
Another thing to do is to know whitch of the ports are available in this ATM asking first the SIU Capabilities. If you try to enable a Port not available in the ATM you have this error. Not all AMTs have the same ports available.
I'm trying to create application where multiple instances will run on same machine and they will communicate together via UDP via the same port.
I was reading many threads on StackOverflow about it that it should be possible.
Though, when I open connection from each application instance I can see that each instance sends a message but only first instance (if first is closed then second...) receives that message.
I'm using ACE library for the communication. Excerpt from code:
ACE_SOCK_Dgram_Mcast dgram;
ACE_INET_Addr *listenAddress = new ACE_INET_Addr(12345, ACE_LOCALHOST);
dgram.open(*listenAddress);
ACE_INET_Addr peer_address;
char buffer[1024];
dgram.send(buffer, 256);
while (true)
{
if (dgram.recv(buffer, 256, peer_address, 0, &receiveLoopTimeout) != -1)
{
std::cout << "Received" << std::endl;
}
}
I also found out that if I call "dgram.join(*listenAddress)" then I get error, code ENODEV from the first instance of the app.
I'm not sure I understand what you are trying to do... send a message multicast so multiple receivers get it, or allow multiple processes to receive on the same UDP port unicast... I'm guessing the former.
You're using the ACE_SOCK_Dgram_Mcast class but with unicast addressing and operations. So only one instance will receive that message.
Check the ACE_wrappers/tests/Multicast_Test.cpp for examples of how to send and receive multicast.
I am attempting to write a price listener.
the data arrives as a 'push' response, ie: chunked transfer-encoding.
i have decided to use the http server api, as both async wininet and winHTTP read data apis both close the connection if there is no data for a short while.
first of all, am i correct to use the http server api?
second, if i try to, as per the msdn example:
retCode = HttpInitialize(
HttpApiVersion,
HTTP_INITIALIZE_SERVER,
NULL
); // return is NO_ERROR
retCode = HttpCreateHttpHandle(
&hReqQueue,
0
); // return is NO_ERROR
std::wstring url = _T( "http://apidintegra.tkfweb.com:80/" );
retCode = HttpAddUrl(
hReqQueue,
url.c_str(),
NULL
); // always fails with ERROR_SHARING_VIOLATION
i always get a sharing violation. do i need to use netsh to configure the connection somehow? if so how? ive seen mention of configuring http.sys, and ive even tried executing the above code as an administrator.
I would be extremely grateful for some help, as there seems very little code out there for this!
Many thanks,
Jon
This error happens if the port is already in use by another process. That means another application uses the port (for example IIS or another web server).
I wrote this program in C++ and on Linux platform.
I wrote a client and server socket program.
In that client program, I wrote socket function and immediately after that I am doing some other actions not at all depending on socket (I wrote 2 for loops for some other logic).
After that I prepared the structures required for the socket and I wrote the connect function...in that I am getting error as unable to connect because connect is returning -1..
But for the same program, if I write that for loop's logic above the socket function and immediately after that structures, and connect function, then it is working fine..
What might be the reason I am not able to get? Please help me in this aspect. Here is my code
here index1 and index 2 are simple integer variables..The configstring is a char array contains 127.0.0.1:7005(address and port number)...address and port are char array variables to store address and port number..
struct sockaddr_in s1;
for(index1=0;configstring[index1]!=':';index1++)
{
address[index1] = configstring[index1];
}
address[index1++]='\0';
for(index2=0;configstring[index1]!='\0';index1++,index2++)
{
port[index2] = configstring[index1];
}
port[index2++]='\0';
int port_num = changeto_int(port);
if((sock_fd = socket(AF_INET,SOCK_STREAM,0)) == -1)
{
printf("unable to create a socket\n");
return 0;
}
s1.sin_family=AF_INET;
s1.sin_port=htons(port_num);
s1.sin_addr.s_addr=inet_addr(address);
memset(s1.sin_zero, '\0', sizeof s1.sin_zero);
int errno;
if(connect(sock_fd,(struct sockaddr *)&s1,sizeof(s1)) == -1)
{
printf("error:unable to connect\n");
printf("Error in connect(): %s\n", strerror( errno));
return -1;
}
First, never do something like this:
int errno;
errno is already defined for you.
More than that I suggest you to use perror() instead of
printf("Error in connect(): %s\n", strerror( errno));
Third, you can't call printf and than strerror( errno) because printf whould change
value of errno to success.
Third, I'd sugget to take a look on examples in internet and start from them.
I'd suggest to read man select_tut there are many good written code examples
of how to do and what.
Have you tried calling strerror on errno? connect() returning -1 would mean that errno has been set and should have more information about your error.
printf("Error in connect(): %s\n", strerror(errno));
Have you considered simply that your receiver is not listening properly for connections?
As others said, use perror to check errno and print some usable debug to the console.
Without your sample code there is no way to help you. There could be a million reasons. Perhaps there's a firewall on your machine blocking connections? Perhaps the server isn't listening, or is on an incorrect port (you did convert to network byte order didn't you?). Perhaps the client is connecting to a wrong address or port. Maybe you haven't set up your structures correctly.
I recommend reading Beej's Socket Programming Doo-Daa for a good introduction to sockets on Unix (and it follows on to Windows).
struct sockaddr_in s1;
could you please try memset of s1, at the beginning of your program.
I have experienced some thing similar to this.
Could you print debugging info about the address and port string ?
Remove the errno thing, include and use perror.
Compile with -Wall
Judging from your comment that perror() returns "socket operation on non socket"... How are your address and port variables declared? Is it possible that port[index2++]='\0' somehow overwrite onto sock_fd or such?
try adding :
inet_pton(AF_INET, your IP address, (void *)&server_address);
before making connection to the server.
Also,I have a hunch that the problem behind the scene could be around serverside.
Low level socket programming is tedious and error prone. You would be well advised to start using frameworks like Boost or ACE that shield you from these low level details and allow you to program platform independent.