/* $Id: dict.c,v 1.2 2005/05/17 16:56:29 hno Exp $ * Copyright (C) 2002 Rodrigo Campos** 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 of the License, 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.** Author: Rodrigo Campos (rodrigo@geekbunker.org)* */			  #include <stdio.h>#include <stdlib.h>#include <string.h>#include <sys/types.h>#include <sys/socket.h>#include <netinet/in.h>#include <arpa/inet.h>#include "ip_user.h"#ifndef DEBUG#undef DEBUG#endif/* This function parses the dictionary file and loads it  * in memory. All IP addresses are processed with a bitwise AND * with their netmasks before they are stored. * If there磗 no netmask (no /) in the in the lhs , a mask * 255.255.255.255 is assumed. * It returns a pointer to the first entry of the linked list */struct ip_user_dict *load_dict (FILE * FH){  struct ip_user_dict *current_entry;	/* the structure used to					   store data */  struct ip_user_dict *first_entry = NULL;	/* the head of the						   linked list */  char line[BUFSIZE];		/* the buffer for the lines read				   from the dict file */  char *cp;			/* a char pointer used to parse				   each line */  char *username;		/* for the username */  char *tmpbuf;			/* for the address before the				   bitwise AND */  /* the pointer to the first entry in the linked list */  first_entry = malloc (sizeof (struct ip_user_dict));  current_entry = first_entry;  while ((cp = fgets (line, sizeof (line), FH)) != NULL) {		  if (line[0] == '#') {				  continue;		  }    if ((cp = strchr (line, '\n')) != NULL) {      /* chop \n characters */      *cp = '\0';    }    if ((cp = strtok (line, "\t ")) != NULL) {      /* get the username */      username = strtok (NULL, "\t ");      /* look for a netmask */      if ((cp = strtok (line, "/")) != NULL) {	/* store the ip address in a temporary buffer */	tmpbuf = cp;	cp = strtok (NULL, "/");	if (cp != NULL) {	  /* if we have a slash in the lhs, we have a netmask */	  current_entry->netmask = (inet_addr (cp));	  current_entry->address =	    (((inet_addr (tmpbuf))) & current_entry->netmask);	} else {	  /* when theres no slash, we figure the netmask is /32 */	  current_entry->address = (inet_addr (tmpbuf));	  current_entry->netmask = (inet_addr ("255.255.255.255"));	}      }      /* get space for the username */      current_entry->username =	calloc (strlen (username) + 1, sizeof (char));      strcpy (current_entry->username, username);      /* get space and point current_entry to the new entry */      current_entry->next_entry =	malloc (sizeof (struct ip_user_dict));      current_entry = current_entry->next_entry;    }  }  /* Return a pointer to the first entry linked list */  return first_entry;}				/* load_dict *//* This function looks for a matching ip/mask in * the dict file loaded in memory. * It returns 1 if it finds a match or 0 if no match is found */intdict_lookup (struct ip_user_dict *first_entry, char *username,	     char *address){  /* Move the pointer to the first entry of the linked list. */  struct ip_user_dict *current_entry = first_entry;  while (current_entry->username != NULL) {#ifdef DEBUG    printf ("user: %s\naddr: %lu\nmask: %lu\n\n",	    current_entry->username, current_entry->address,	    current_entry->netmask);#endif    if ((inet_addr (address) & (unsigned long) current_entry->	 netmask) == current_entry->address) {      /* If the username contains an @ we assume it磗 a group and         call the corresponding function */      if ((strchr (current_entry->username, '@')) == NULL) {	if ((match_user (current_entry->username, username)) == 1)	  return 1;      } else {	if ((match_group (current_entry->username, username)) == 1)	  return 1;      }    }    current_entry = current_entry->next_entry;  }  /* If no match was found we return 0 */  return 0;}				/* dict_lookup */