3 * $Id: acl.h,v 1.3 1999/07/27 18:30:53 mdw Exp $
5 * Access control list handling
7 * (c) 1999 Straylight/Edgeware
10 /*----- Licensing notice --------------------------------------------------*
12 * This file is part of the `fw' port forwarder.
14 * `fw' is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
19 * `fw' is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
24 * You should have received a copy of the GNU General Public License
25 * along with `fw'; if not, write to the Free Software Foundation,
26 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
29 /*----- Revision history --------------------------------------------------*
32 * Revision 1.3 1999/07/27 18:30:53 mdw
33 * Various minor portability fixes.
35 * Revision 1.2 1999/07/26 23:28:16 mdw
36 * Minor modifications for new design.
38 * Revision 1.1.1.1 1999/07/01 08:56:23 mdw
50 /*----- Header files ------------------------------------------------------*/
54 #include <sys/types.h>
55 #include <sys/socket.h>
56 #include <netinet/in.h>
58 /*----- Data structures ---------------------------------------------------*/
60 /* --- An access control entry --- */
62 typedef struct acl_entry
{
63 struct acl_entry
*next
; /* Next entry in the list */
64 unsigned act
; /* What to do with matching hosts */
65 struct in_addr addr
, mask
; /* Address and netmask */
68 #define ACL_DENY 0 /* Deny access to matching hosts */
69 #define ACL_ALLOW 1 /* Allow access to matching hosts */
70 #define ACL_PERM 1u /* Bit mask for permission bit */
72 /*----- Functions provided ------------------------------------------------*/
74 /* --- @acl_check@ --- *
76 * Arguments: @acl_entry *a@ = pointer to ACL to check against
77 * @struct in_addr addr@ = address to check
79 * Returns: Nonzero if allowed.
81 * Use: Checks an address against an ACL.
84 extern int acl_check(acl_entry */
*a*/
, struct in_addr
/*addr*/);
86 /* --- @acl_dump@ --- *
88 * Arguments: @acl_entry *a@ = pointer to ACL to dump
89 * @FILE *fp@ = pointer to stream to dump on
93 * Use: Dumps an access control list to an output stream.
96 extern void acl_dump(acl_entry */
*a*/
, FILE */
*fp*/
);
98 /* --- @acl_free@ --- *
100 * Arguments: @acl_entry *a@ = pointer to a list of ACLs
104 * Use: Frees all of the memory used by an ACL.
107 extern void acl_free(acl_entry */
*a*/
);
109 /* --- @acl_add@ --- *
111 * Arguments: @acl_entry ***a@ = address of pointer to list tail
112 * @unsigned act@ = what to do with matching addresses
113 * @struct in_addr addr, mask@ = address and mask to match
117 * Use: Adds an entry to the end of an access control list.
120 extern void acl_add(acl_entry
***/
*a*/
, unsigned /*act*/,
121 struct in_addr
/*addr*/, struct in_addr
/*mask*/);
123 /*----- That's all, folks -------------------------------------------------*/