/*----------------------------------------------------------------------
       Get the current host and domain names

    Args: hostname   -- buffer to return the hostname in
          hsize      -- size of buffer above
          domainname -- buffer to return domain name in
          dsize      -- size of buffer above

  Result: The system host and domain names are returned. If the full host
          name is akbar.cac.washington.edu then the domainname is
          cac.washington.edu.

On Internet connected hosts this look up uses /etc/hosts and DNS to
figure all this out. On other less well connected machines some other
file may be read. If there is no notion of a domain name the domain
name may be left blank. On a PC where there really isn't a host name
this should return blank strings. The .pinerc will take care of
configuring the domain names. That is, this should only return the
native system's idea of what the names are if the system has such
a concept.
 ----*/
void
getdomainnames(hostname, hsize, domainname, dsize)
     char *hostname, *domainname;
     int   hsize, dsize;
{
#ifdef	LWP
    char           *dn;
    long            iaddr;
    struct hostent *he;
    struct in_addr in;

    if((iaddr = getmyipaddr()) == -1){	/* host name not found! */
	hostname[0] = '\0';
	domainname[0] = '\0';
	return;
    }

    if((he=gethostbyaddr((char *)&iaddr, 4, PF_INET)) == NULL){
	in.s_addr = iaddr;
	sprintf(hostname, "[%s]", inet_ntoa(in));
	domainname[0] = '\0';
	return;
    }

    strncpy(hostname, he->h_name, hsize-1);
    if((dn = strindex(hostname, '.')) != NULL) {
        strncpy(domainname, dn+1, dsize-1);
    } else {
        strncpy(domainname, hostname, dsize-1);
    }

    domainname[dsize-1] = '\0';
#else
#ifdef	PCTCP
    char *dn;
    long  myip;

    hostname[0] = domainname[0] = '\0';

    if(gethostname(hostname, hsize-1) <= 0){
	if(myip = gethostid()){
	    sprintf(hostname, "[%s]", inet_ntoa(myip));
	}
	else if(getconf("ifcust", "ip-address", &hostname[1], hsize-2)){
	    /*
	     * must be running older kernel, we'll have to look harder...
	     */
	    hostname[0] = '[';
	    strcat(hostname, "]");
	}
	else
	  strcpy(hostname, "0.0.0.0");
    }

    if(getdomainname(domainname, dsize-1) <= 0){
	domainname[0] = '\0';
	if(hostname[0] != '[' && (dn = strindex(hostname, '.')) != NULL)
          strncpy(domainname, dn+1, dsize-1);
	else
          strncpy(domainname, hostname, dsize-1);
    }
#else
#ifdef	PCNFS
    char *dn;
    unsigned   long  myip;

    hostname[0] = domainname[0] = '\0';

    if(gethostname(hostname, hsize-1) <= 0){
	if(get_myipaddr((char *) &myip)){
	    sprintf(hostname, "[%s]", inet_ntoa(myip));
	}
	else
	  strcpy(hostname, "0.0.0.0");
    }

    if(getdomainname(domainname, dsize-1) <= 0){
	domainname[0] = '\0';
	if(hostname[0] != '[' && (dn = strindex(hostname, '.')) != NULL)
          strncpy(domainname, dn+1, dsize-1);
	else
          strncpy(domainname, hostname, dsize-1);
    }
#else
    char           *dn, hname[MAX_ADDRESS+1];
    extern int      sock_initted;
    long            myip;

    hostname[0] = domainname[0] = '\0';

    if(!sock_initted++)
	sock_init();

    tcp_cbrk(0x01);		/* turn off ctrl-break catching */

    /*
     * haven't discovered a way to find out the local host's 
     * name with wattcp yet.
     */
    if(myip = gethostid())
      sprintf(hostname, "[%s]", inet_ntoa(hname, myip));

    if(getdomainname(domainname, dsize-1) == NULL){
	domainname[0] = '\0';
    }
#endif	/* !PCNFS */
#endif	/* !PCTCP */
#endif	/* !LWP */
}