3 * $Id: name.c,v 1.8 2003/10/12 00:14:55 mdw Exp $
5 * Looking up of names in symbol tables
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 1.8 2003/10/12 00:14:55 mdw
33 * Major overhaul. Now uses DSA signatures rather than the bogus symmetric
34 * encrypt-and-hope thing. Integrated with mLib and Catacomb.
36 * Revision 1.7 1998/04/23 13:23:56 mdw
37 * Fix bugs involving empty classes.
39 * Revision 1.6 1998/01/12 16:46:14 mdw
42 * Revision 1.5 1997/09/17 10:26:11 mdw
43 * Use rewritten class handler. Support `none' class.
45 * Revision 1.4 1997/08/20 16:17:59 mdw
46 * Replace `name_reinit' by `name_end' for more sensible restart.
48 * Revision 1.3 1997/08/07 09:49:39 mdw
49 * Extensive modifications to handle netgroups. Also sanitise user and group
50 * names before adding them to the symbol table.
52 * Revision 1.2 1997/08/04 10:24:24 mdw
53 * Sources placed under CVS control.
55 * Revision 1.1 1997/07/21 13:47:46 mdw
60 /*----- Header files ------------------------------------------------------*/
62 /* --- ANSI headers --- */
69 /* --- Unix headers --- */
71 #include <sys/types.h>
72 #include <sys/socket.h>
74 #include <netinet/in.h>
76 #include <arpa/inet.h>
82 /* --- mLib headers --- */
84 #include <mLib/alloc.h>
87 /* --- Local headers --- */
97 /*----- Static variables --------------------------------------------------*/
99 static sym_table name__table; /* Symbol table for everything */
101 /*----- Main code ---------------------------------------------------------*/
103 /* --- @name__get@ --- *
105 * Arguments: @const char *p@ = pointer to the name we want
106 * @unsigned type@ = type of class it should have
108 * Returns: A pointer to a name ready to use, or zero if there's a type
111 * Use: Creates a name of the appropriate type all ready to use.
114 static name *name__get(const char *p, unsigned type)
117 name *n = sym_find(&name__table, p, -1, sizeof(*n), &f);
120 return ((n->c && !(n->c->type & type)) ? 0 : n);
123 /* --- @name__sanitise@ --- *
125 * Arguments: @const char *n@ = pointer to a name
126 * @char *buf@ = pointer to a buffer of space
127 * @size_t sz@ = size of the buffer
129 * Returns: A pointer to the transformed name in the buffer, or null
130 * if there wasn't enough space.
132 * Use: Transforms a name so that it only contains nice characters.
135 static char *name__sanitise(const char *n, char *buf, size_t sz)
139 if (strlen(n) + 1 > sz)
143 if (isalnum((unsigned char)*n))
153 /* --- @name__users@ --- *
159 * Use: Adds all of the users registered with the user database to
160 * the name table. Also adds the users' primary groups.
163 static void name__users(void)
169 userdb_iterateUsers();
170 while ((pw = userdb_nextUser()) != 0) {
172 uid_t u = pw->pw_uid;
174 /* --- First, add the user to the table --- */
176 if (name__sanitise(pw->pw_name, buf, sizeof(buf)) &&
177 (n = name__get(buf, clType_user)) != 0)
178 n->c = class_addUser(n->c, u);
180 /* --- Now handle the user's default group --- */
182 if ((gr = userdb_groupById(pw->pw_gid)) != 0 &&
183 name__sanitise(gr->gr_name, buf, sizeof(buf)) &&
184 (n = name__get(buf, clType_user)) != 0)
185 n->c = class_addUser(n->c, u);
189 /* --- @name__groups@ --- *
195 * Use: Adds users into all of their supplementary groups.
198 static void name__groups(void)
205 userdb_iterateGroups();
206 while ((gr = userdb_nextGroup()) != 0) {
209 if (name__sanitise(gr->gr_name, buf, sizeof(buf)) &&
210 (n = name__get(buf, clType_user)) != 0) {
212 /* --- Now add all of the members --- */
214 for (p = gr->gr_mem; *p; p++) {
215 if ((pw = userdb_userByName(*p)) != 0)
216 n->c = class_addUser(n->c, pw->pw_uid);
224 /* --- @name__scan@ --- *
226 * Arguments: @netg *n@ = the netgroup handle we're scanning
227 * @const char *host@ = the host name
228 * @const char *user@ = the user name
229 * @const char *domain@ = the (NIS?) domain name
230 * @void *ctx@ = some context pointer
232 * Returns: Zero to continue scanning.
234 * Use: Scans a netgroup, adding items to the name table.
237 /* --- A data type --- */
239 typedef struct name__scanctx {
240 char *name; /* Netgroup name prefixed with `?_'*/
241 unsigned f; /* Various interesting flags */
242 name *h; /* Name entry for hosts */
243 name *u; /* Name entry for users */
246 enum { f_host = 1, f_user = 2 };
248 /* --- And now for the real code --- */
250 static int name__scan(netg *n, const char *host, const char *user,
251 const char *domain, void *ctx)
253 name__scanctx *sc = ctx;
255 /* --- Add the host to the hosts class --- */
257 if (sc->f & f_host && host) {
262 /* --- First ensure that I have a host class --- */
266 sc->h = name__get(sc->name, clType_host);
273 /* --- Now that I've done that, try to add the host --- *
275 * I'll turn it into an IP address. There's less chance of confusion
279 if ((h = gethostbyname(host)) == 0)
281 memcpy(&in, h->h_addr, sizeof(in));
282 if ((a = inet_ntoa(in)) == 0)
284 sc->h->c = class_addString(sc->h->c, a);
288 /* --- Add the user to the users class --- */
290 if (sc->f & f_user && user) {
293 /* --- First ensure that I have a user class --- */
297 sc->u = name__get(sc->name, clType_user);
304 /* --- Add the user to the list --- */
306 if ((pw = userdb_userByName(user)) == 0)
308 sc->u->c = class_addUser(sc->u->c, pw->pw_uid);
315 /* --- @name__netgroups@ --- *
321 * Use: Populates the name table with netgroup information.
324 void name__netgroups(void)
333 while ((n = netg_next()) != 0) {
335 if (name__sanitise(p, buf + 2, sizeof(buf) - 2) == 0)
339 sc.f = f_host | f_user;
340 netg_scan(n, name__scan, &sc);
344 /* --- @name_init@ --- *
350 * Use: Initialises the name table. Requires the user database to
351 * be populated (see @userdb_local@ and @userdb_yp@, and
357 /* --- Initialise the name table --- */
359 sym_create(&name__table);
361 /* --- Add everyone into the table --- */
367 /* --- Finally add in the `all' and `none' classes --- *
369 * Do that now, to prevent them being overwritten by the above.
376 n = sym_find(&name__table, "all", -1, sizeof(name), &f);
381 n = sym_find(&name__table, "none", -1, sizeof(name), &f);
388 /* --- @name_end@ --- *
394 * Use: Closes down the name database, so that it can be
400 /* --- Empty the symbol table --- */
406 for (sym_mkiter(&i, &name__table); (n = sym_next(&i)) != 0; ) {
412 /* --- Destroy and recreate the table --- */
414 sym_destroy(&name__table);
417 /* --- @name_find@ --- *
419 * Arguments: @const char *p@ = pointer to name to look up
420 * @unsigned create@ = whether to create the item
421 * @unsigned *f@ = whether the item was created
423 * Returns: Pointer to a @name@ block containing the symbol, or
424 * zero if it wasn't found and we didn't want to create a
427 * Use: Looks up a name in the symbol table and returns the
431 name *name_find(const char *p, unsigned create, unsigned *f)
433 /* --- This is a trivial veneer onto @sym_find@ --- */
435 return (sym_find(&name__table, p, -1, create ? sizeof(name) : 0, f));
438 /* --- @name_dump@ --- *
444 * Use: Dumps a complete listing of the symbol table.
453 trace(TRACE_DEBUG, "name: dumping names");
454 for (sym_mkiter(&i, &name__table); (n = sym_next(&i)) != 0; ) {
455 trace(TRACE_DEBUG, "name: dumping `%s'", n->base.name);
457 trace(TRACE_DEBUG, "name: <empty>");
464 /*----- Test driver -------------------------------------------------------*/
471 traceon(stdout, TRACE_ALL);
477 /* printf("loaded (%lu)\n", track_memused()); */
484 /* printf("cleared (%lu)\n", track_memused()); */
485 /* track_memlist(); */
491 /* printf("reloaded (%lu)\n", track_memused()); */