c4f2d992 |
1 | /* -*-c-*- |
2 | * |
51cf22e0 |
3 | * $Id: class.c,v 1.5 1997/08/20 16:16:13 mdw Exp $ |
c4f2d992 |
4 | * |
5 | * Handling classes of things nicely |
6 | * |
7 | * (c) 1997 EBI |
8 | */ |
9 | |
03f996bd |
10 | /*----- Licensing notice --------------------------------------------------* |
c4f2d992 |
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 |
03f996bd |
25 | * along with `become'; if not, write to the Free Software Foundation, |
26 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
c4f2d992 |
27 | */ |
28 | |
29 | /*----- Revision history --------------------------------------------------* |
30 | * |
31 | * $Log: class.c,v $ |
51cf22e0 |
32 | * Revision 1.5 1997/08/20 16:16:13 mdw |
33 | * Patch memory leak. Don't try to trace when tracing's turned off. |
34 | * |
4f67acfa |
35 | * Revision 1.4 1997/08/07 09:56:37 mdw |
36 | * (Log entry for previous version is bogus.) Minor changes to host |
37 | * checking code. |
607937a4 |
38 | * |
03f996bd |
39 | * Revision 1.2 1997/08/04 10:24:21 mdw |
40 | * Sources placed under CVS control. |
41 | * |
42 | * Revision 1.1 1997/07/21 13:47:52 mdw |
c4f2d992 |
43 | * Initial revision |
44 | * |
45 | */ |
46 | |
47 | /*----- Header files ------------------------------------------------------*/ |
48 | |
49 | /* --- ANSI headers --- */ |
50 | |
51 | #include <stdio.h> |
52 | #include <stdlib.h> |
53 | #include <string.h> |
54 | |
55 | /* --- Unix headers --- */ |
56 | |
57 | #include <sys/types.h> |
58 | #include <sys/socket.h> |
59 | |
60 | #include <netinet/in.h> |
61 | |
62 | #include <arpa/inet.h> |
63 | |
64 | #include <netdb.h> |
65 | |
66 | /* --- Local headers --- */ |
67 | |
03f996bd |
68 | #include "become.h" |
c4f2d992 |
69 | #include "class.h" |
70 | #include "set.h" |
71 | #include "sym.h" |
72 | #include "utils.h" |
73 | |
74 | /*----- Global variables --------------------------------------------------*/ |
75 | |
76 | static classdef class__all = { clType_all, -1, 0 }; |
77 | classdef *class_all = &class__all; |
78 | |
79 | /*----- Wildcard matching -------------------------------------------------*/ |
80 | |
81 | /* --- @class__wildMatch@ --- * |
82 | * |
83 | * Arguments: @const char *pat@ = pointer to pattern string |
84 | * @const char *p@ = pointer to target string |
85 | * |
86 | * Returns: Zero if no match, nonzero if match. |
87 | * |
88 | * Use: Wildcard-matches the pattern against the target string. |
89 | */ |
90 | |
91 | static int class__wildMatch(const char *pat, const char *p) |
92 | { |
93 | for (;;) { |
94 | if (*pat == 0 && *p == 0) |
95 | return (42); /* For sadism's sake */ |
96 | else if (*pat == '*') { |
97 | while (*pat == '*') |
98 | pat++; |
99 | do { |
100 | if (class__wildMatch(pat, p)) |
101 | return (27); /* Nyahaha */ |
102 | p++; |
103 | } while (*p); |
104 | return (0); |
105 | } else if (*pat == '?' || *pat == *p) |
106 | p++, pat++; |
107 | else |
108 | return (0); |
109 | } |
110 | } |
111 | |
112 | /*----- Main code ---------------------------------------------------------*/ |
113 | |
114 | /* --- @class_create@ --- * |
115 | * |
116 | * Arguments: @unsigned type@ = type of the class to create |
117 | * @sym_table *t@ = pointer to symbol table which stores info |
118 | * |
119 | * Returns: Pointer to a @classdef@ which maintains the class's info. |
120 | * |
121 | * Use: Creates a new class definition. The new definition has one |
122 | * reference attached to it (which is the one you get returned). |
123 | */ |
124 | |
125 | classdef *class_create(unsigned type, sym_table *t) |
126 | { |
127 | classdef *c = xmalloc(sizeof(*c)); |
128 | c->type = type; |
129 | c->ref = 1; |
130 | c->t = t; |
131 | return (c); |
132 | } |
133 | |
134 | /* --- @class_inc@ --- * |
135 | * |
136 | * Arguments: @classdef *c@ = pointer to a class block |
137 | * |
138 | * Returns: --- |
139 | * |
140 | * Use: Adds a reference to the class definition. |
141 | */ |
142 | |
143 | void class_inc(classdef *c) |
144 | { |
145 | if (c != class_all) |
146 | c->ref++; |
147 | } |
148 | |
149 | /* --- @class_dec@ --- * |
150 | * |
151 | * Arguments: @classdef *c@ = pointer to a class block |
152 | * |
153 | * Returns: --- |
154 | * |
155 | * Use: Removes a reference to a class block. |
156 | */ |
157 | |
158 | void class_dec(classdef *c) |
159 | { |
160 | if (c != class_all && !--c->ref) { |
161 | sym_destroyTable(c->t); |
51cf22e0 |
162 | free(c->t); |
c4f2d992 |
163 | free(c); |
164 | } |
165 | } |
166 | |
167 | /* --- @class_userMatch@ --- * |
168 | * |
169 | * Arguments: @classdef *c@ = pointer to a class block |
170 | * @int u@ = uid number to check against |
171 | * |
172 | * Returns: Zero if no match, nonzero if it matched. |
173 | * |
174 | * Use: Looks to see if a user is in a group. |
175 | */ |
176 | |
177 | int class_userMatch(classdef *c, int u) |
178 | { |
179 | if (~c->type & clType_user) |
180 | return (0); |
03f996bd |
181 | else if (c == class_all) { |
182 | T( trace(TRACE_CHECK, "check: user %i matched by all", u); ) |
c4f2d992 |
183 | return (1); |
03f996bd |
184 | } else { |
185 | sym_base *s = sym_find(c->t, (char *)&u, sizeof(u), 0, 0); |
186 | T( trace(TRACE_CHECK, |
187 | s ? "check: user %i matched" : "check: user %i not matched", |
188 | u); ) |
189 | return (s != 0); |
190 | } |
c4f2d992 |
191 | } |
192 | |
193 | /* --- @class_commandMatch@ --- * |
194 | * |
195 | * Arguments: @classdef *c@ = pointer to a class block |
196 | * @const char *p@ = pointer to command string to match |
197 | * |
198 | * Returns: Zero for no match, nonzero if it matched. |
199 | * |
200 | * Use: Tries to match a string against the wildcard patterns in the |
201 | * given class. Note that this involves examining all the |
202 | * items, so it's not too quick. Then again, you don't have |
203 | * big command classes, do you...? |
204 | */ |
205 | |
206 | int class_commandMatch(classdef *c, const char *p) |
207 | { |
208 | sym_iter i; |
209 | sym_base *s; |
210 | |
211 | if (~c->type & clType_command) |
212 | return (0); |
03f996bd |
213 | else if (c == class_all) { |
214 | T( trace(TRACE_CHECK, "check: command `%s' matched by all", p); ) |
c4f2d992 |
215 | return (1); |
03f996bd |
216 | } else { |
c4f2d992 |
217 | for (sym_createIter(&i, c->t); (s = sym_next(&i)) != 0; ) { |
03f996bd |
218 | if (class__wildMatch(s->name, p)) { |
219 | T( trace(TRACE_CHECK, "check: command `%s' matched by `%s'", |
220 | p, s->name); ) |
c4f2d992 |
221 | return (1); |
03f996bd |
222 | } |
c4f2d992 |
223 | } |
03f996bd |
224 | T( trace(TRACE_CHECK, "check: command `%s' not matched", p); ) |
c4f2d992 |
225 | return (0); |
226 | } |
227 | } |
228 | |
229 | /* --- @class_hostMatch@ --- * |
230 | * |
231 | * Arguments: @classdef *c@ = pointer to class block |
232 | * @struct in_addr addr@ = IP address to match |
233 | * |
234 | * Returns: Zero for no match, nonzero if it matched. |
235 | * |
236 | * Use: Tries to match an IP address against the patterns and masks |
237 | * in the given class. |
238 | */ |
239 | |
240 | int class_hostMatch(classdef *c, struct in_addr addr) |
241 | { |
242 | sym_iter i; |
243 | sym_base *s; |
244 | const char *a; |
245 | struct hostent *he; |
246 | char **p; |
247 | |
248 | if (~c->type & clType_host) |
249 | return (0); |
03f996bd |
250 | else if (c == class_all) { |
251 | T( trace(TRACE_CHECK, "check: host %s matched by all", |
252 | inet_ntoa(addr)); ) |
c4f2d992 |
253 | return (1); |
03f996bd |
254 | } else { |
c4f2d992 |
255 | |
256 | /* --- Get the dotted-quad and other names for the address --- */ |
257 | |
03f996bd |
258 | if ((a = inet_ntoa(addr)) == 0) { |
259 | T( trace(TRACE_CHECK, "check: couldn't translate address (erk!)"); ) |
c4f2d992 |
260 | return (0); |
03f996bd |
261 | } |
607937a4 |
262 | |
263 | if ((he = gethostbyaddr((char *)&addr, sizeof(addr), AF_INET)) == 0) |
03f996bd |
264 | T( trace(TRACE_CHECK, "check: couldn't resolve hostname for %s", a); ) |
c4f2d992 |
265 | |
266 | /* --- Now search the list for a match --- * |
267 | * |
268 | * This is almost infinitely slow, I'm afraid. |
269 | */ |
270 | |
271 | for (sym_createIter(&i, c->t); (s = sym_next(&i)) != 0; ) { |
272 | |
273 | /* --- Check the dotted-quad name first --- */ |
274 | |
03f996bd |
275 | if (class__wildMatch(s->name, a)) { |
276 | T( trace(TRACE_CHECK, "check: host address `%s' matched by `%s'", |
277 | a, s->name); ) |
c4f2d992 |
278 | return (1); |
03f996bd |
279 | } |
c4f2d992 |
280 | |
607937a4 |
281 | if (he) { |
c4f2d992 |
282 | |
607937a4 |
283 | /* --- Now try the host's main name --- */ |
c4f2d992 |
284 | |
607937a4 |
285 | if (class__wildMatch(s->name, he->h_name)) { |
286 | T( trace(TRACE_CHECK, "check: host name `%s' matched by `%s'", |
287 | he->h_name, s->name); ) |
c4f2d992 |
288 | return (1); |
03f996bd |
289 | } |
607937a4 |
290 | |
291 | /* --- Now go through all the names --- */ |
292 | |
293 | for (p = he->h_aliases; *p; p++) { |
294 | if (class__wildMatch(s->name, *p)) { |
295 | T( trace(TRACE_CHECK, "check: host alias `%s' matched by `%s'", |
296 | *p, s->name); ) |
297 | return (1); |
298 | } |
299 | } |
c4f2d992 |
300 | } |
301 | } |
03f996bd |
302 | |
303 | T( trace(TRACE_CHECK, "check: couldn't match hostname `%s'", |
304 | he->h_name); ) |
c4f2d992 |
305 | return (0); |
306 | } |
307 | } |
308 | |
309 | /* --- @class_dump@ --- * |
310 | * |
311 | * Arguments: @classdef *c@ = pointer to a class block |
c4f2d992 |
312 | * |
313 | * Returns: --- |
314 | * |
315 | * Use: Dumps the contents of a class to a stream. |
316 | */ |
317 | |
03f996bd |
318 | void class_dump(classdef *c) |
c4f2d992 |
319 | { |
51cf22e0 |
320 | #ifdef TRACING |
c4f2d992 |
321 | sym_iter i; |
322 | sym_base *s; |
323 | |
c4f2d992 |
324 | /* --- Dump the table --- */ |
325 | |
326 | if (c->type != clType_all) { |
327 | for (sym_createIter(&i, c->t); (s = sym_next(&i)) != 0; ) { |
328 | switch (c->type) { |
329 | case clType_user: |
03f996bd |
330 | trace(TRACE_RULE, " %i", *(int *)s->name); |
c4f2d992 |
331 | break; |
332 | case clType_command: |
333 | case clType_host: |
03f996bd |
334 | trace(TRACE_RULE, " `%s'", s->name); |
c4f2d992 |
335 | break; |
336 | } |
337 | } |
338 | } |
03f996bd |
339 | else |
340 | trace(TRACE_RULE, " ALL"); |
51cf22e0 |
341 | #endif |
c4f2d992 |
342 | } |
343 | |
344 | /*----- That's all, folks -------------------------------------------------*/ |