?
Solved

unix networking programming

Posted on 1998-12-17
7
Medium Priority
?
278 Views
Last Modified: 2013-12-23
The answer you gave me to the question about a remote service written in c under unix does not run! It is full of bugs! Help me out!!
0
Comment
Question by:boosta
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
7 Comments
 
LVL 2

Expert Comment

by:rdelfino
ID: 1582729

Who have you sent this question?

What answer?

Which bugs?

Who am I?

Who was George Washington?

What am I doing here?

Reginaldo
stoned . . . . . . .
 
0
 
LVL 22

Expert Comment

by:blu
ID: 1582730
Since you accepted the first answer, your question no longer
appears. I suggest that you repost the question and/or incorrect
answer so that someone else might be able to help you. For instance, I am having a little trouble understanding the question from you original text and the answer might help, or clarifying the question could help.  What do you mean by converting a username to an IP address?
0
 
LVL 4

Expert Comment

by:davidmwilliams
ID: 1582731
 I wonder if you are referring to your earlier question where you asked for a sample service like daytime, which I answered by supplying the following program (reproduced here for the benefit of others who do not wish to have to 'pay' points to read the original question) -

#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>

extern int errno;

int TCPdaytime (const char* host, const char *service);
int errexit (const char *format, ...);
int connectTCP (const char *host, const char *service)

#define LINELEN 128

int main (int argc, char *argv [])
{
  char *host = "localhost";
  char *service = "daytime";

  switch (argc)
  {
    case 1:
      host = "localhost";
      break;

    case 3:
      service = argv [2];

    case 2:
      host = argv [1];
      break

    default:
      fprintf (stderr, "usage: TCPdaytime [host [port]]\n");
      exit (1);
  }

  TCPdaytime (host, service);
  exit (0);
}

TCPdaytime (const char *host, const char *service)
{
  char buf [LINELEN + 1];
  int s, n;

  s = connectTCP (host, service);

  while ( (n = read (s, buf, LINELEN)) > 0)
  {
    buf [n] = '\0';
    (void) fputs (buf, stdout);
  }
}

int errexit (const char *format, ...)
{
  va_list args;

  va_start (args, format);
  vfprintf (stderr, format, args);
  va_end (args);
  exit (1);
}

int connectTCP (const char *host, const char *service)
{
  struct hostent *phe;
  struct servent *pse;
  struct protoent *ppe;
  struct sockaddr_in sin;
  int s, type;

  memset (&sin, 0, sizeof (sin));
  sin.sin_family = AF_INET;

  if (pse = getservbyname (service, "tcp"))
    sin.sin_port = pse->s_port;
  else if ( (sin.sin_port = htons ((u_short) atoi (service))) == 0)
    errexit ("Can't get \"%s\" service entry.\n", service);

  if (phe = gethostbyname (host))
    memcpy (&sin.sin_addr, phe->h_addr, phe->h_length);
  else if ((sin.sin_addr.s_addr = inet_addr (host)) == INADDR_NONE)
    errexit ("Can't get \"%s\" host entry.\n", host);

  if ((ppe = getprotobyname ("tcp")) == 0)
    errexit ("Can't get \"tcp\" protocol entry.\n");

  type = SOCK_STREAM;

  s = socket (PF_INET, type, ppe->p_proto);
  if (s < 0)
    errexit ("Can't create socket: %s\n", strerror (errno));

  if (connect (s, (struct sockaddr *) &sin, sizeof (sin)) < 0)
    errexit ("Can't connect to %s.%s: %s\n", host, service, strerror (errno));

  return s;
}

  Now, you marked my answer as 'correct' on November 15th, and said "Thanx a lot. Its appropriate and accurate." (exact words).
  So, if you are unhappy with my answer, I'm surprised that you have changed your mind a month later, or you marked it as correct and 'accurate' without even running it.
  What version of Unix are you using?  What are the problems you are experiencing?  Please be more explicit.
0
Supports up to 4K resolution!

The VS192 2-Port 4K DisplayPort Splitter is perfect for anyone who needs to send one source of DisplayPort high definition video to two or four DisplayPort displays. The VS192 can split and also expand DisplayPort audio/video signal on two or four DisplayPort monitors.

 
LVL 4

Expert Comment

by:davidmwilliams
ID: 1582732
 Perhaps more importantly, have you modified the program, since I provided it !!
0
 
LVL 4

Accepted Solution

by:
davidmwilliams earned 330 total points
ID: 1582733
 The program presented works fine...
0
 

Author Comment

by:boosta
ID: 1582734
I have tested this program NOW and it works fine! Sorry for the inconvenience! Thanx!
0
 
LVL 4

Expert Comment

by:davidmwilliams
ID: 1582735
Phew !  No problem at all.  Glad it helped!
0

Featured Post

Get MongoDB database support online, now!

At Percona’s web store you can order your MongoDB database support needs in minutes. No hassles, no fuss, just pick and click. Pay online with a credit card. Handle your MongoDB database support now!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Make the most of your online learning experience.
This article is in regards to the Cisco QSFP-4SFP10G-CU1M cables, which are designed to uplink/downlink 40GB ports to 10GB SFP ports. I recently experienced this and found very little configuration documentation on how these are supposed to be confi…
Get a first impression of how PRTG looks and learn how it works.   This video is a short introduction to PRTG, as an initial overview or as a quick start for new PRTG users.
Monitoring a network: why having a policy is the best policy? Michael Kulchisky, MCSE, MCSA, MCP, VTSP, VSP, CCSP outlines the enormous benefits of having a policy-based approach when monitoring medium and large networks. Software utilized in this v…
Suggested Courses

743 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question