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How can I perform a RPC ping programatically with C++

I am writing a program that connects to a series of hosts to make a change to registries on Win32 platforms. I am using the RegConnectRegistry() Win32 API to connect to these remote hosts over RPC. The problem is, when a host is not available, it takes 30 seconds or longer for the API to timeout. Therefore, I would like to perform an RPC ping on each host before making the call to RegConnectRegistry(). Does anyone know which method/function I can use to do this? I have search google, experts exchange, and MSDN - no luck.

Thanks!

John
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JohnBolton
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JohnBolton
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1 Solution
 
OnegaZhangCommented:
Some ping related posts
http://www.codeguru.com/Cpp/I-N/network/

You can consider put those lengthy operation into work thread.
You can use asynchronous socket try to connect port 135 before RegConnectRegistry()

Welcome to www.fruitfruit.com 
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jkrCommented:
RPC itself does not implement a 'ping' - however, you could use an ICMP ping:

// Declare and initialize variables
char *SendData = "Data Buffer";
LPVOID ReplyBuffer;
      
ReplyBuffer = (VOID*) malloc(sizeof(ICMP_ECHO_REPLY) + sizeof(SendData));
if ((dwRetVal = IcmpSendEcho(hIcmpFile,
  inet_addr("123.456.789.0"),
  SendData, sizeof(SendData),
  NULL, ReplyBuffer,
  sizeof(ReplyBuffer) + sizeof(ICMP_ECHO_REPLY),
  1000)) != 0) {
  printf("\tReceived %ld messages.\n", dwRetVal);
  printf("\tMessage: %s\n", ReplyBuffer);
}
else {
  printf("\tCall to IcmpSendEcho() failed.\n");
  printf("\tError: %ld\n", GetLastError());
}

see e.g. http://msdn.microsoft.com/library/default.asp?url=/library/en-us/iphlp/iphlp/icmpsendecho.asp ("IcmpSendEcho")
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JohnBoltonAuthor Commented:
Thanks for the feedback on the IcmpEchoPing. There is a utility from Microsoft called RPCPing.exe so I am sure there is a way to "ping" an RPC server. Another problem I run into is that the Remote Registry Service is off on some of these workstations. So even if the IcmpEchoPing returns true, I am still unable to connect with RegConnectRegistry() and am forced to wait 30 seconds.

The environment I have to consider could have over 10,000 workstations, so I need something that is fairly quick.

John
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jkrCommented:
>>There is a utility from Microsoft called RPCPing.exe so I am sure there is a way to "ping" an RPC server

No. That tool serves a different purpose:

http://support.microsoft.com/default.aspx?scid=kb;en-us;167260

"The RPC Ping Utility can be used to confirm the RPC connectivity between the computer running Microsoft Exchange Server and any of the supported Microsoft Exchange Client workstations on the network. This utility can be used to check if the Microsoft Exchange Server services are responding to RPC requests from the client workstations via the network. "

IOW: It connects to a RPC server. That will not work for you, since *your* RPC server connect uses that lengthy timeout. Having done quite a bit RPC coding, I can assure you that there is no 'generic ping'  in that area.
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JohnBoltonAuthor Commented:
Yes, I have read that page and understand what you are saying. Please don't misunderstand me, I am sure you are very competent.

However, when I did testing with the RPCPing utility, I pinged hosts that do not have Exchange Server running. RPC seems to the be the underlying protocol for the remote registry service. So, for example, if a workstation has the XP firewall turned on, or remote registry service is turned off, RPCPing will return a failure. If everything is as it should be, RPCPing returns success. This is why I am bent on figuring out which API's Microsoft used in RPCPing.

What do you think? :)
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JohnBoltonAuthor Commented:
OnegaZhang: if you can provide me with an example, I'll award the points to you. Your solution to try an asynchronous socket on the NBT ports seems like my best bet.
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