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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: acl.h,v 1.4 2003/11/25 14:08:23 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 1.4 2003/11/25 14:08:23 mdw |
33 | * Debianization. Socket target options. Internet binding. |
34 | * |
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35 | * Revision 1.3 1999/07/27 18:30:53 mdw |
36 | * Various minor portability fixes. |
37 | * |
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38 | * Revision 1.2 1999/07/26 23:28:16 mdw |
39 | * Minor modifications for new design. |
40 | * |
41 | * Revision 1.1.1.1 1999/07/01 08:56:23 mdw |
42 | * Initial revision. |
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43 | * |
44 | */ |
45 | |
46 | #ifndef ACL_H |
47 | #define ACL_H |
48 | |
49 | #ifdef __cplusplus |
50 | extern "C" { |
51 | #endif |
52 | |
53 | /*----- Header files ------------------------------------------------------*/ |
54 | |
55 | #include <stdio.h> |
56 | |
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57 | #include <sys/types.h> |
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58 | #include <sys/socket.h> |
59 | #include <netinet/in.h> |
60 | |
61 | /*----- Data structures ---------------------------------------------------*/ |
62 | |
63 | /* --- An access control entry --- */ |
64 | |
65 | typedef struct acl_entry { |
66 | struct acl_entry *next; /* Next entry in the list */ |
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67 | const struct acl_ops *ops; /* Operations for the ACL entry */ |
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68 | unsigned act; /* What to do with matching hosts */ |
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69 | } acl_entry; |
70 | |
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71 | #define ACL_DENY 0 /* Deny access to matching conns */ |
72 | #define ACL_ALLOW 1 /* Allow access to matching conns */ |
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73 | #define ACL_PERM 1u /* Bit mask for permission bit */ |
74 | |
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75 | /* --- Host-based access control --- */ |
76 | |
77 | typedef struct acl_host { |
78 | acl_entry a; /* Base structure */ |
79 | struct in_addr addr, mask; /* Address and netmask */ |
80 | } acl_host; |
81 | |
82 | /* --- ACL methods --- */ |
83 | |
84 | typedef struct acl_ops { |
85 | int (*check)(void */*a*/, struct in_addr /*addr*/, unsigned /*port*/); |
86 | void (*dump)(void */*a*/, FILE */*fp*/); |
87 | void (*free)(void */*a*/); |
88 | } acl_ops; |
89 | |
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90 | /*----- Functions provided ------------------------------------------------*/ |
91 | |
92 | /* --- @acl_check@ --- * |
93 | * |
94 | * Arguments: @acl_entry *a@ = pointer to ACL to check against |
95 | * @struct in_addr addr@ = address to check |
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96 | * @unsigned port@ = port number to check |
97 | * @int *act@ = verdict (should initially be @ACT_ALLOW@) |
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98 | * |
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99 | * Returns: Zero if undecided, nonzero if a rule matched. |
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100 | * |
101 | * Use: Checks an address against an ACL. |
102 | */ |
103 | |
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104 | extern int acl_check(acl_entry */*a*/, |
105 | struct in_addr /*addr*/, unsigned /*port*/, |
106 | int */*act*/); |
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107 | |
108 | /* --- @acl_dump@ --- * |
109 | * |
110 | * Arguments: @acl_entry *a@ = pointer to ACL to dump |
111 | * @FILE *fp@ = pointer to stream to dump on |
112 | * |
113 | * Returns: --- |
114 | * |
115 | * Use: Dumps an access control list to an output stream. |
116 | */ |
117 | |
118 | extern void acl_dump(acl_entry */*a*/, FILE */*fp*/); |
119 | |
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120 | /* --- @acl_free@ --- * |
121 | * |
122 | * Arguments: @acl_entry *a@ = pointer to a list of ACLs |
123 | * |
124 | * Returns: --- |
125 | * |
126 | * Use: Frees all of the memory used by an ACL. |
127 | */ |
128 | |
129 | extern void acl_free(acl_entry */*a*/); |
130 | |
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131 | /* --- @acl_addhost@ --- * |
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132 | * |
133 | * Arguments: @acl_entry ***a@ = address of pointer to list tail |
134 | * @unsigned act@ = what to do with matching addresses |
135 | * @struct in_addr addr, mask@ = address and mask to match |
136 | * |
137 | * Returns: --- |
138 | * |
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139 | * Use: Adds a host-authentication entry to the end of an access |
140 | * control list. |
141 | */ |
142 | |
143 | extern void acl_addhost(acl_entry ***/*a*/, unsigned /*act*/, |
144 | struct in_addr /*addr*/, struct in_addr /*mask*/); |
145 | |
146 | /* --- @acl_addpriv@ --- * |
147 | * |
148 | * Arguments: @acl_entry ***a@ = address of pointer to list tail |
149 | * @unsigned act@ = what to do with matching addresses |
150 | * |
151 | * Returns: --- |
152 | * |
153 | * Use: Adds a privileged-port check to the end of an access control |
154 | * list. |
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155 | */ |
156 | |
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157 | extern void acl_addpriv(acl_entry ***/*a*/, unsigned /*act*/); |
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158 | |
159 | /*----- That's all, folks -------------------------------------------------*/ |
160 | |
161 | #ifdef __cplusplus |
162 | } |
163 | #endif |
164 | |
165 | #endif |