/*
 *   logtool - a logfile parsing/monitoring/manipulation utility
 *
 *   Copyright (C) Y2K (2000) A.L.Lambert
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2, or (at your option)
 *   any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/* Yee ole includes (I put this all in one file for my sanity) */
#include "includes.h"

#ifndef NO_RESOLVER
/* var's for gethostbyaddr() stuff      */
extern int h_errno;
struct hostent *h;

int lt_gdbm_query(char *ip_addr);
int lt_gdbm_write(char *ip_addr, char *h_name);

/* define our database stuff */
int lt_db_gethost(char *ip_addr) {
	short int ret = FALSE;
#ifndef WE_USE_GDBM
	return FALSE;
#endif
	/* we wrap this in case someday we need more complicated things to happen here */
	ret = lt_gdbm_query(ip_addr);
	return ret; /* tell calling function if we populated lt_host or not */
	return FALSE;
}
void lt_db_savehost(char *ip_addr, char *h_name) {
	char line[LSIZE];
#ifndef WE_USE_GDBM
	return;
#endif
	/* we wrap this in case someday we need more complicated things to happen here */
	/* we need a timestamp at the end of ip_addr */
	sprintf(line, "%s %li", h_name, time(NULL));
	lt_gdbm_write(ip_addr, line);
	return;
}
#endif /* no resolver */

/* a wrapper for gethostbyaddr() for my own sanity      */
char *get_host(char *ip_addr) {

#ifdef NO_RESOLVER
	return FALSE;
#else
	short int ret = FALSE;
	
        in_addr_t ad;   /* our network byte order storage spot  */
	
	if(cf.resolv == FALSE) return NULL;
       
	strcpy(lt_host, "");	/* get rid of any old data */
	h = NULL;       /* null out our global variable */

	/* see if we can get a hostname out of the database   */
	ret = lt_db_gethost(ip_addr);
	if(ret == TRUE) {
		if(strcmp(lt_host, "!") != 0) {
			return(lt_host);
		}  else {
			return NULL;
		}
	}
	/* if we made it here, it wasn't in the database, so move along to doing a host lookup */
	ad = inet_addr(ip_addr); /* crunch input into network byte order        */

        h = gethostbyaddr((char *) &ad, sizeof(ad), AF_INET);
       	if(h == NULL) {
		lt_db_savehost(ip_addr, "!");
		return NULL;
	}
        /* see what we got and return appropriately */
	if(h->h_name != NULL) {
		strcpy(lt_host, h->h_name);

		lt_db_savehost(ip_addr, lt_host);
                return (lt_host);
        } 
        /* if we made it this far and didn't return, things are bad; so return now      */
        return NULL;
#endif

}