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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: class.h,v 1.3 1997/09/17 10:14:56 mdw Exp $ |
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4 | * |
5 | * Handling classes of things nicely |
6 | * |
7 | * (c) 1997 EBI |
8 | */ |
9 | |
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10 | /*----- Licensing notice --------------------------------------------------* |
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11 | * |
12 | * This file is part of `become' |
13 | * |
14 | * `Become' 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 | * `Become' 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 |
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25 | * along with `become'; if not, write to the Free Software Foundation, |
26 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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27 | */ |
28 | |
29 | /*----- Revision history --------------------------------------------------* |
30 | * |
31 | * $Log: class.h,v $ |
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32 | * Revision 1.3 1997/09/17 10:14:56 mdw |
33 | * Complete rewrite to support class trees. Makes the behaviour of the set |
34 | * operators much more logical. |
35 | * |
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36 | * Revision 1.2 1997/08/04 10:24:21 mdw |
37 | * Sources placed under CVS control. |
38 | * |
39 | * Revision 1.1 1997/07/21 13:47:52 mdw |
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40 | * Initial revision |
41 | * |
42 | */ |
43 | |
44 | #ifndef CLASS_H |
45 | #define CLASS_H |
46 | |
47 | #ifdef __cplusplus |
48 | extern "C" { |
49 | #endif |
50 | |
51 | /*----- Required headers --------------------------------------------------*/ |
52 | |
53 | #include <sys/types.h> |
54 | #include <sys/socket.h> |
55 | #include <netinet/in.h> |
56 | #include <arpa/inet.h> |
57 | |
58 | #ifndef SYM_H |
59 | # include "sym.h" |
60 | #endif |
61 | |
62 | /*----- Data structures ---------------------------------------------------*/ |
63 | |
64 | /* --- Class types --- */ |
65 | |
66 | enum { |
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67 | |
68 | /* --- Data types (user visible) --- * |
69 | * |
70 | * These bits encode what the user can think of as `types'. They get used |
71 | * for typechecking and things. |
72 | */ |
73 | |
74 | clType_user = 0x01, /* Class of users */ |
75 | clType_command = 0x02, /* Class of command strings */ |
76 | clType_host = 0x04, /* Class of host names */ |
77 | clType_all = 0x0F, /* All of the above (maintain me) */ |
78 | clType_mask = 0x0F, /* Mask for type flags */ |
79 | |
80 | /* --- Node types --- * |
81 | * |
82 | * A class actually looks suspiciously like a tree once things start |
83 | * getting complicated. These bits encode the type of node we've got here. |
84 | */ |
85 | |
86 | clNode_any = 0x10, /* Magic type for the `all' class */ |
87 | clNode_immed = 0x20, /* Immediate data item */ |
88 | clNode_hash = 0x30, /* Hashtable of values */ |
89 | clNode_union = 0x40, /* Union of two classes */ |
90 | clNode_binop = 0x50, /* Binary operations start here */ |
91 | clNode_diff = 0x50, /* Difference of two classes */ |
92 | clNode_isect = 0x60, /* Intersection of two classes */ |
93 | clNode_mask = 0xF0, /* Mask for picking these out */ |
94 | |
95 | /* --- Other useful flags --- */ |
96 | |
97 | clFlag_friendly = 0x100 /* Item can be hashed with others */ |
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98 | }; |
99 | |
100 | /* --- Class block --- */ |
101 | |
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102 | typedef struct class_node { |
103 | unsigned type; /* Class and node type, and flags */ |
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104 | unsigned ref; /* Reference count */ |
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105 | union { |
106 | uid_t u; /* Immediate user id number */ |
107 | char *s; /* Immediate string value */ |
108 | sym_table t; /* Hash table for this class */ |
109 | struct { |
110 | struct class_node *l, *r; /* Left and right operands */ |
111 | } c; /* Class operands for binops */ |
112 | } v; /* Value of this class node */ |
113 | } class_node; |
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114 | |
115 | /*----- Global variables --------------------------------------------------*/ |
116 | |
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117 | extern class_node *class_all; /* The match-everything class */ |
118 | extern class_node *class_none; /* The match-nothing class */ |
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119 | |
120 | /*----- Functions provided ------------------------------------------------*/ |
121 | |
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122 | /* --- @class_fromString@ --- * |
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123 | * |
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124 | * Arguments: @unsigned type@ = a type field |
125 | * @const char *s@ = pointer to string to copy |
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126 | * |
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127 | * Returns: A pointer to a class node containing that string, typed to |
128 | * be the right thing. |
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129 | * |
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130 | * Use: Given a string, wrap a class node around it. The node has |
131 | * one reference (the one you get returned). The string is |
132 | * copied, so you can get rid of your original one if you like. |
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133 | */ |
134 | |
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135 | extern class_node *class_fromString(unsigned /*type*/, const char */*s*/); |
136 | |
137 | /* --- @class_fromUser@ --- * |
138 | * |
139 | * Arguments: @unsigned type@ = a type field |
140 | * @uid_t u@ = a user-id number |
141 | * |
142 | * Returns: A pointer to a class node containing the uid, typed to be |
143 | * the thing you asked for. Hopefully this will be |
144 | * @clType_user@. |
145 | * |
146 | * Use: Given a uid, wrap a class node around it. |
147 | */ |
148 | |
149 | extern class_node *class_fromUser(unsigned /*type*/, uid_t /*u*/); |
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150 | |
151 | /* --- @class_inc@ --- * |
152 | * |
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153 | * Arguments: @class_node *c@ = pointer to a class block |
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154 | * |
155 | * Returns: --- |
156 | * |
157 | * Use: Adds a reference to the class definition. |
158 | */ |
159 | |
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160 | extern void class_inc(class_node */*c*/); |
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161 | |
162 | /* --- @class_dec@ --- * |
163 | * |
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164 | * Arguments: @class_node *c@ = pointer to a class block |
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165 | * |
166 | * Returns: --- |
167 | * |
168 | * Use: Removes a reference to a class block. |
169 | */ |
170 | |
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171 | extern void class_dec(class_node */*c*/); |
172 | |
173 | /* --- @class_mod@ --- * |
174 | * |
175 | * Arguments: @class_node *c@ = pointer to a class node |
176 | * |
177 | * Returns: A pointer to a class node, maybe the same one, maybe not, |
178 | * with a reference count of 1, containing the same data. |
179 | * |
180 | * Use: Gives you a node which you can modify. Don't call this |
181 | * for @class_all@ or @class_none@. |
182 | */ |
183 | |
184 | extern class_node *class_mod(class_node */*c*/); |
185 | |
186 | /* --- @class_union@ --- * |
187 | * |
188 | * Arguments: @class_node *l@ = left argument |
189 | * @class_node *r@ = right argument |
190 | * |
191 | * Returns: A class node representing the union of the two classes. |
192 | * |
193 | * Use: Performs the union operation on classes. If the types don't |
194 | * match, then a null pointer is returned. Both @l@ and @r@ |
195 | * may be modified, and will be decremented before they get |
196 | * returned to you. If you don't want that to happen, ensure |
197 | * that you've claimed a reference to the original versions. |
198 | */ |
199 | |
200 | extern class_node *class_union(class_node */*l*/, class_node */*r*/); |
201 | |
202 | /* --- @class_diff@ --- * |
203 | * |
204 | * Arguments: @class_node *l@ = left argument |
205 | * @class_node *r@ = right argument |
206 | * |
207 | * Returns: A class node representing the difference of the two classes. |
208 | * |
209 | * Use: Performs the set difference operation on classes. If the |
210 | * types don't match, then a null pointer is returned. Both |
211 | * @l@ and @r@ may be modified, and will be decremented before |
212 | * they get returned to you. If you don't want that to happen, |
213 | * ensure that you've claimed a reference to the original |
214 | * versions. |
215 | */ |
216 | |
217 | extern class_node *class_diff(class_node */*l*/, class_node */*r*/); |
218 | |
219 | /* --- @class_isect@ --- * |
220 | * |
221 | * Arguments: @class_node *l@ = left argument |
222 | * @class_node *r@ = right argument |
223 | * |
224 | * Returns: A class node representing the intersection of the two |
225 | * classes. |
226 | * |
227 | * Use: Performs the intersecion operation on classes. If the types |
228 | * don't match, then a null pointer is returned. Both @l@ and |
229 | * @r@ may be modified, and will be decremented before they get |
230 | * returned to you. If you don't want that to happen, ensure |
231 | * that you've claimed a reference to the original versions. |
232 | */ |
233 | |
234 | extern class_node *class_isect(class_node */*l*/, class_node */*r*/); |
235 | |
236 | /* --- @class_addUser@ --- * |
237 | * |
238 | * Arguments: @class_node *c@ = pointer to a class node (may be null) |
239 | * @uid_t u@ = user id number |
240 | * |
241 | * Returns: Pointer to the combined node. |
242 | * |
243 | * Use: Adds a user to a node, maybe hashifying it. |
244 | */ |
245 | |
246 | extern class_node *class_addUser(class_node */*c*/, uid_t /*u*/); |
247 | |
248 | /* --- @class_addString@ --- * |
249 | * |
250 | * Arguments: @class_node *c@ = pointer to a class node (may be null) |
251 | * @const char *s@ = pointer to a string |
252 | * |
253 | * Returns: Pointer to the combined node. |
254 | * |
255 | * Use: Adds a user to a node, maybe hashifying it. |
256 | */ |
257 | |
258 | extern class_node *class_addString(class_node */*c*/, const char */*s*/); |
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259 | |
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260 | /* --- @class_matchUser@ --- * |
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261 | * |
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262 | * Arguments: @class_node *c@ = pointer to root class node |
263 | * @uid_t u@ = user id number |
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264 | * |
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265 | * Returns: Nonzero if it matches, zero if it doesn't. |
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266 | * |
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267 | * Use: Determines whether a user is matched by a class. Assumes |
268 | * that the types are correct. |
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269 | */ |
270 | |
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271 | extern int class_matchUser(class_node */*c*/, uid_t /*u*/); |
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272 | |
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273 | /* --- @class_matchCommand@ --- * |
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274 | * |
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275 | * Arguments: @class_node *c@ = pointer to root class node |
276 | * @const char *s@ = pointer to a string |
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277 | * |
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278 | * Returns: Nonzero if it matches, zero if it doesn't. |
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279 | * |
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280 | * Use: Determines whether a string is matched by a class. Assumes |
281 | * that the types are correct. |
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282 | */ |
283 | |
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284 | extern int class_matchCommand(class_node */*c*/, const char */*s*/); |
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285 | |
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286 | /* --- @class_matchHost@ --- * |
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287 | * |
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288 | * Arguments: @class_node *c@ = pointer to root class node |
289 | * @struct in_addr a@ = IP address to match |
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290 | * |
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291 | * Returns: Nonzero if it matches, zero if it doesn't. |
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292 | * |
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293 | * Use: Determines whether a host matches a host class. Assumes |
294 | * that the types are correct. The actual mechanism is a bit |
295 | * odd here, but I think this is the Right Thing. At each stage |
296 | * I try to match %%@/all/%% of the possible names for the host. |
297 | * Thus host `splat' with address 1.2.3.4 would fail to match |
298 | * the class "1.2.*" - "splat". This seems to be what the |
299 | * author intuitively expects. It's just a bit weird. |
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300 | */ |
301 | |
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302 | extern int class_matchHost(class_node */*c*/, struct in_addr /*a*/); |
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303 | |
304 | /* --- @class_dump@ --- * |
305 | * |
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306 | * Argumemnts: @class_node *c@ = pointer to root node |
307 | * @int indent@ = indent depth |
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308 | * |
309 | * Returns: --- |
310 | * |
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311 | * Use: Dumps a class to the trace output. |
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312 | */ |
313 | |
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314 | extern void class_dump(class_node */*c*/, int /*indent*/); |
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315 | |
316 | /*----- That's all, folks -------------------------------------------------*/ |
317 | |
318 | #ifdef __cplusplus |
319 | } |
320 | #endif |
321 | |
322 | #endif |
323 | |