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From: vd09+@ANDREW.CMU.EDU ("Vincent M. Del Vecchio")
Newsgroups: comp.protocols.tcp-ip
Subject: Telnettable programs
Message-ID: <sarjVxa00WBL837GEy@andrew.cmu.edu>
Date: 31 Aug 90 23:53:33 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 68

I am trying to write a network daemon-type program which will not be called 
from inetd, but which other users can telnet to.  However, when I try to 
telnet, I get a connection refused.  I can write another program which will 
connect fine, but telnet seems to be looking for something else.  I looked at 
the code for inetd (which handles these things for most daemons) and it was a 
bit of a mess, but the only thing that I saw was that I might not have been 
setting socket options that I needed to.  Does anyone have any ideas?  The 
relevant portion of the code follows:


#include <string.h>
#include <strings.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <errno.h> 

main()
  {  
    struct sockaddr_in sockad, oend;
    int sock, accepteds, size = sizeof (sockad), 
        osize = sizeof (oend), buf[100];

    if ((sock = socket(AF_INET, SOCK_STREAM, 0, 0)) == -1)
      perror ("creating socket"),
      exit(1);
    sockad.sin_family = AF_INET;
    sockad.sin_port = 3007;  /* The port we'll try to telnet to */
    sockad.sin_addr.S_un.S_addr = INADDR_ANY;
    if (bind (sock, &sockad, sizeof (sockad)) == -1)
      perror ("binding socket"),
      exit(1);
    if (getsockname (sock, &sockad, &size) == -1)
      perror ("Bad address for socket"),
      exit(1);
    printf ("%d\\n",sockad.sin_port);
    if (listen (sock,5) == -1)
      perror ("listening on socket"),
      exit(1);
    printf ("Waiting\\n");
    do
      {
        errno = 0;
        osize = sizeof (oend);
        accepteds = accept(sock, &oend, &osize);
      }
    while (accepteds == -1 && errno == EINTR);
    if (accepteds == -1)
      perror ("accepting on socket"),
      exit(1);
    printf ("Accepted");
    process(accepteds);
  }

It's not very well (or at all) commented, but it's fairly short.  It prints 
out the port number 3007, and "Waiting" and then sits... when I try to telnet, 
it says "Connection refused," and the program doesn't do anything; just keeps 
waiting.  I would very much appreciate any ideas.

TIA, and, as I don't read this board normally, please respond via email.
 If there is interest (please mail me also) I will summarize.

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| Vincent Del Vecchio     \ vd09+@andrew.cmu.edu                             |
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