3 * $Id: class.c,v 1.2 1997/08/04 10:24:21 mdw Exp $
5 * Handling classes of things nicely
10 /*----- Licensing notice --------------------------------------------------*
12 * This file is part of `become'
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.
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.
24 * You should have received a copy of the GNU General Public License
25 * along with `become'; 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 1.2 1997/08/04 10:24:21 mdw
33 * Sources placed under CVS control.
35 * Revision 1.1 1997/07/21 13:47:52 mdw
40 /*----- Header files ------------------------------------------------------*/
42 /* --- ANSI headers --- */
48 /* --- Unix headers --- */
50 #include <sys/types.h>
51 #include <sys/socket.h>
53 #include <netinet/in.h>
55 #include <arpa/inet.h>
59 /* --- Local headers --- */
67 /*----- Global variables --------------------------------------------------*/
69 static classdef class__all = { clType_all, -1, 0 };
70 classdef *class_all = &class__all;
72 /*----- Wildcard matching -------------------------------------------------*/
74 /* --- @class__wildMatch@ --- *
76 * Arguments: @const char *pat@ = pointer to pattern string
77 * @const char *p@ = pointer to target string
79 * Returns: Zero if no match, nonzero if match.
81 * Use: Wildcard-matches the pattern against the target string.
84 static int class__wildMatch(const char *pat, const char *p)
87 if (*pat == 0 && *p == 0)
88 return (42); /* For sadism's sake */
89 else if (*pat == '*') {
93 if (class__wildMatch(pat, p))
94 return (27); /* Nyahaha */
98 } else if (*pat == '?' || *pat == *p)
105 /*----- Main code ---------------------------------------------------------*/
107 /* --- @class_create@ --- *
109 * Arguments: @unsigned type@ = type of the class to create
110 * @sym_table *t@ = pointer to symbol table which stores info
112 * Returns: Pointer to a @classdef@ which maintains the class's info.
114 * Use: Creates a new class definition. The new definition has one
115 * reference attached to it (which is the one you get returned).
118 classdef *class_create(unsigned type, sym_table *t)
120 classdef *c = xmalloc(sizeof(*c));
127 /* --- @class_inc@ --- *
129 * Arguments: @classdef *c@ = pointer to a class block
133 * Use: Adds a reference to the class definition.
136 void class_inc(classdef *c)
142 /* --- @class_dec@ --- *
144 * Arguments: @classdef *c@ = pointer to a class block
148 * Use: Removes a reference to a class block.
151 void class_dec(classdef *c)
153 if (c != class_all && !--c->ref) {
154 sym_destroyTable(c->t);
159 /* --- @class_userMatch@ --- *
161 * Arguments: @classdef *c@ = pointer to a class block
162 * @int u@ = uid number to check against
164 * Returns: Zero if no match, nonzero if it matched.
166 * Use: Looks to see if a user is in a group.
169 int class_userMatch(classdef *c, int u)
171 if (~c->type & clType_user)
173 else if (c == class_all) {
174 T( trace(TRACE_CHECK, "check: user %i matched by all", u); )
177 sym_base *s = sym_find(c->t, (char *)&u, sizeof(u), 0, 0);
178 T( trace(TRACE_CHECK,
179 s ? "check: user %i matched" : "check: user %i not matched",
185 /* --- @class_commandMatch@ --- *
187 * Arguments: @classdef *c@ = pointer to a class block
188 * @const char *p@ = pointer to command string to match
190 * Returns: Zero for no match, nonzero if it matched.
192 * Use: Tries to match a string against the wildcard patterns in the
193 * given class. Note that this involves examining all the
194 * items, so it's not too quick. Then again, you don't have
195 * big command classes, do you...?
198 int class_commandMatch(classdef *c, const char *p)
203 if (~c->type & clType_command)
205 else if (c == class_all) {
206 T( trace(TRACE_CHECK, "check: command `%s' matched by all", p); )
209 for (sym_createIter(&i, c->t); (s = sym_next(&i)) != 0; ) {
210 if (class__wildMatch(s->name, p)) {
211 T( trace(TRACE_CHECK, "check: command `%s' matched by `%s'",
216 T( trace(TRACE_CHECK, "check: command `%s' not matched", p); )
221 /* --- @class_hostMatch@ --- *
223 * Arguments: @classdef *c@ = pointer to class block
224 * @struct in_addr addr@ = IP address to match
226 * Returns: Zero for no match, nonzero if it matched.
228 * Use: Tries to match an IP address against the patterns and masks
229 * in the given class.
232 int class_hostMatch(classdef *c, struct in_addr addr)
240 if (~c->type & clType_host)
242 else if (c == class_all) {
243 T( trace(TRACE_CHECK, "check: host %s matched by all",
248 /* --- Get the dotted-quad and other names for the address --- */
250 if ((a = inet_ntoa(addr)) == 0) {
251 T( trace(TRACE_CHECK, "check: couldn't translate address (erk!)"); )
254 if ((he = gethostbyaddr((char *)&addr, sizeof(addr), AF_INET)) == 0) {
255 T( trace(TRACE_CHECK, "check: couldn't resolve hostname for %s", a); )
259 /* --- Now search the list for a match --- *
261 * This is almost infinitely slow, I'm afraid.
264 for (sym_createIter(&i, c->t); (s = sym_next(&i)) != 0; ) {
266 /* --- Check the dotted-quad name first --- */
268 if (class__wildMatch(s->name, a)) {
269 T( trace(TRACE_CHECK, "check: host address `%s' matched by `%s'",
274 /* --- Now try the host's main name --- */
276 if (class__wildMatch(s->name, he->h_name)) {
277 T( trace(TRACE_CHECK, "check: host name `%s' matched by `%s'",
278 he->h_name, s->name); )
282 /* --- Now go through all the names --- */
284 for (p = he->h_aliases; *p; p++) {
285 if (class__wildMatch(s->name, *p)) {
286 T( trace(TRACE_CHECK, "check: host alias `%s' matched by `%s'",
293 T( trace(TRACE_CHECK, "check: couldn't match hostname `%s'",
299 /* --- @class_dump@ --- *
301 * Arguments: @classdef *c@ = pointer to a class block
305 * Use: Dumps the contents of a class to a stream.
308 void class_dump(classdef *c)
313 /* --- Dump the table --- */
315 if (c->type != clType_all) {
316 for (sym_createIter(&i, c->t); (s = sym_next(&i)) != 0; ) {
319 trace(TRACE_RULE, " %i", *(int *)s->name);
323 trace(TRACE_RULE, " `%s'", s->name);
329 trace(TRACE_RULE, " ALL");
332 /*----- That's all, folks -------------------------------------------------*/