Re: Remote IP for inetd "daemon"

["Jeremy C. Reed" <reed@wcug.wwu.edu>]

On Tue, 18 Sep 2001, Marcel Hicking wrote:

> I have a script invoked via inetd.
> How can I let the script know of the IP of the client
> connecting (remote IP)?
> I need to do some additional security checks not
> possible with hosts.access|deny
> 
> Any hints?

getpeername(2) is the C library function to get the remote IP. This works
for me:

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdio.h>

int main (int argc, char *argv[])

{

  struct sockaddr_in name;
  int namelen = sizeof(name);
  char *temp_domain;

  if (getpeername((int) 1,
        (struct sockaddr *) & name, (socklen_t *) & namelen) == 0) {
    if ((temp_domain = (char *) inet_ntoa(name.sin_addr)))
      printf ("%s", temp_domain);
  }
}

Then compile it with "gcc -o getpeername getpeername.c". Then use the
getpeername executable in your script.

  Jeremy C. Reed
  http://www.reedmedia.net/
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