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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: acl.h,v 1.3 1999/07/27 18:30:53 mdw Exp $ |
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4 | * |
5 | * Access control list handling |
6 | * |
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7 | * (c) 1999 Straylight/Edgeware |
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8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
11 | * |
12 | * This file is part of the `fw' port forwarder. |
13 | * |
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. |
18 | * |
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. |
23 | * |
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. |
27 | */ |
28 | |
29 | /*----- Revision history --------------------------------------------------* |
30 | * |
31 | * $Log: acl.h,v $ |
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32 | * Revision 1.3 1999/07/27 18:30:53 mdw |
33 | * Various minor portability fixes. |
34 | * |
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35 | * Revision 1.2 1999/07/26 23:28:16 mdw |
36 | * Minor modifications for new design. |
37 | * |
38 | * Revision 1.1.1.1 1999/07/01 08:56:23 mdw |
39 | * Initial revision. |
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40 | * |
41 | */ |
42 | |
43 | #ifndef ACL_H |
44 | #define ACL_H |
45 | |
46 | #ifdef __cplusplus |
47 | extern "C" { |
48 | #endif |
49 | |
50 | /*----- Header files ------------------------------------------------------*/ |
51 | |
52 | #include <stdio.h> |
53 | |
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54 | #include <sys/types.h> |
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55 | #include <sys/socket.h> |
56 | #include <netinet/in.h> |
57 | |
58 | /*----- Data structures ---------------------------------------------------*/ |
59 | |
60 | /* --- An access control entry --- */ |
61 | |
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 */ |
66 | } acl_entry; |
67 | |
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 */ |
71 | |
72 | /*----- Functions provided ------------------------------------------------*/ |
73 | |
74 | /* --- @acl_check@ --- * |
75 | * |
76 | * Arguments: @acl_entry *a@ = pointer to ACL to check against |
77 | * @struct in_addr addr@ = address to check |
78 | * |
79 | * Returns: Nonzero if allowed. |
80 | * |
81 | * Use: Checks an address against an ACL. |
82 | */ |
83 | |
84 | extern int acl_check(acl_entry */*a*/, struct in_addr /*addr*/); |
85 | |
86 | /* --- @acl_dump@ --- * |
87 | * |
88 | * Arguments: @acl_entry *a@ = pointer to ACL to dump |
89 | * @FILE *fp@ = pointer to stream to dump on |
90 | * |
91 | * Returns: --- |
92 | * |
93 | * Use: Dumps an access control list to an output stream. |
94 | */ |
95 | |
96 | extern void acl_dump(acl_entry */*a*/, FILE */*fp*/); |
97 | |
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98 | /* --- @acl_free@ --- * |
99 | * |
100 | * Arguments: @acl_entry *a@ = pointer to a list of ACLs |
101 | * |
102 | * Returns: --- |
103 | * |
104 | * Use: Frees all of the memory used by an ACL. |
105 | */ |
106 | |
107 | extern void acl_free(acl_entry */*a*/); |
108 | |
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109 | /* --- @acl_add@ --- * |
110 | * |
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 |
114 | * |
115 | * Returns: --- |
116 | * |
117 | * Use: Adds an entry to the end of an access control list. |
118 | */ |
119 | |
120 | extern void acl_add(acl_entry ***/*a*/, unsigned /*act*/, |
121 | struct in_addr /*addr*/, struct in_addr /*mask*/); |
122 | |
123 | /*----- That's all, folks -------------------------------------------------*/ |
124 | |
125 | #ifdef __cplusplus |
126 | } |
127 | #endif |
128 | |
129 | #endif |