d93c181f   
   From: lacos@caesar.elte.hu   
      
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   On Thu, 23 Sep 2010, GSA wrote:   
      
   > On Sep 23, 4:34 am, David Schwartz  wrote:   
   >> On Sep 22, 11:48 am, GSA  wrote:   
   >>   
   >>> I need to maintain threads as the two operations are independent. Also   
   >>> I want to keep these 2 threads running eternally.   
   >>   
   >> Maybe I'm misunderstanding. Both threads are talking to Cli and both   
   >> threads are talking to Srv. How can the two operations be independent?   
   >> If the link to Cli or Srv fails, neither thread can keep doing its   
   >> job.   
   >>   
   >> If I misunderstood and the threads don't share any sockets at all,   
   >> then if a thread loses a socket, just have it recreate that socket.   
   >>   
   >> DS   
   >   
   > I want a module which sits b/w a server and a client and passes data   
   > between them, either side to the other side.   
   > The threads do share sockets:   
   > Thread 1: SRV->Srv-Cli->CLI   
   > Thread 2: CLI->Srv-Cli->SRV   
   > the intermediate module has a server socket thru which it communicates   
   > with CLI and a client sock thru which it communicates with SRV in both   
   > the threads. am highly confused on eror handling and usage of select   
   > as an alternative   
      
   As Jorgen Grahn asked before, do you want a "TCP proxy", in other words a   
   "TCP port forwarder"? If so, do you want to use it only, or do you want to   
   study its source? For the first case, you were probably best off with   
   something widely deployed, and I think ssh was a good suggestion. Other   
   choices may include netcat, socat, stunnel, and whatever you might find on   
   freshmeat.net (ISTR tinyproxy, for example).   
      
   For the second case, if you considered a minimalistic single-threaded   
   implementation with select(), and one that supports half-open connections   
   (emerging when recv() returns an EOF condition), perhaps check out the   
   following.   
      
   (All, sorry if embedding a compressed C file is bad netiquette, but I   
   didn't want to link to my homepage again, and once included, it is smaller   
   this way. If irritated, just plonk me.)   
      
   $ uudecode forward3.c.bz2.b64   
   $ bunzip2 forward3.c.bz2   
   $ gcc -ansi -pedantic -Wall -Wextra -o forward3 forward3.c   
   $ # You might need to add -lxnet if not on GNU/Linux.   
   $ ./forward3 -h   
      
   lacos   
      
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    * Origin: you cannot sedate... all the things you hate (1:229/2)