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Thinking

04-27-2005 04:32 AM

reverse DNS in C?

hiho@ll

i just wrote a server who needs to make a RDNS to get the hostname of the ip who just connected to my server
anybody knows a C-function or a prog, which could do this for me?

thx@ll

win32sux

04-27-2005 04:56 AM

i'm not a programmer, but from what i googled i think what you want might be:

Code:

gethostbyaddr()

just my two cents...

BTW, i've asked a moderator to move your thread to the programming forum so that it will be more exposed to programmers...

david_ross

04-27-2005 11:53 AM

Moved: This thread is more suitable in Programming and has been moved accordingly to help your thread/question get the exposure it deserves.

itsme86

04-27-2005 12:05 PM

I've used this in a program to do that:

Code:

char *ip_to_hostname(char *hostname)

{

  struct hostent *hent;

  struct in_addr addr;



  if(!inet_aton(hostname, &addr))

    return(hostname);



  if((hent = gethostbyaddr((char *)&(addr.s_addr), sizeof(addr.s_addr),

    AF_INET)))

  {

    strcpy(hostname, hent->h_name);

  }



  return(hostname);

}

hostname would initially hold the IP address.

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