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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: name.c,v 1.4 1997/08/20 16:17:59 mdw Exp $ |
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4 | * |
5 | * Looking up of names in symbol tables |
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: name.c,v $ |
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32 | * Revision 1.4 1997/08/20 16:17:59 mdw |
33 | * Replace `name_reinit' by `name_end' for more sensible restart. |
34 | * |
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35 | * Revision 1.3 1997/08/07 09:49:39 mdw |
36 | * Extensive modifications to handle netgroups. Also sanitise user and group |
37 | * names before adding them to the symbol table. |
38 | * |
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39 | * Revision 1.2 1997/08/04 10:24:24 mdw |
40 | * Sources placed under CVS control. |
41 | * |
42 | * Revision 1.1 1997/07/21 13:47:46 mdw |
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43 | * Initial revision |
44 | * |
45 | */ |
46 | |
47 | /*----- Header files ------------------------------------------------------*/ |
48 | |
49 | /* --- ANSI headers --- */ |
50 | |
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51 | #include <ctype.h> |
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52 | #include <stdio.h> |
53 | #include <stdlib.h> |
54 | #include <string.h> |
55 | |
56 | /* --- Unix headers --- */ |
57 | |
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58 | #include <sys/types.h> |
59 | #include <sys/socket.h> |
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60 | |
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61 | #include <netinet/in.h> |
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62 | |
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63 | #include <arpa/inet.h> |
64 | |
65 | #include <netdb.h> |
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66 | #include <grp.h> |
67 | #include <pwd.h> |
68 | |
69 | /* --- Local headers --- */ |
70 | |
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71 | #include "config.h" |
72 | |
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73 | #include "become.h" |
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74 | #include "class.h" |
75 | #include "name.h" |
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76 | #include "netg.h" |
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77 | #include "sym.h" |
78 | #include "userdb.h" |
79 | #include "utils.h" |
80 | |
81 | /*----- Static variables --------------------------------------------------*/ |
82 | |
83 | static sym_table name__table; /* Symbol table for everything */ |
84 | |
85 | /*----- Main code ---------------------------------------------------------*/ |
86 | |
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87 | /* --- @name__get@ --- * |
88 | * |
89 | * Arguments: @const char *p@ = pointer to the name we want |
90 | * @unsigned type@ = type of class it should have |
91 | * |
92 | * Returns: A pointer to a name ready to use, or zero if there's a type |
93 | * conflict. |
94 | * |
95 | * Use: Creates a name of the appropriate type all ready to use. |
96 | */ |
97 | |
98 | static name *name__get(const char *p, unsigned type) |
99 | { |
100 | unsigned f; |
101 | name *n = sym_find(&name__table, p, -1, sizeof(*n), &f); |
102 | if (!f) { |
103 | sym_table *t = xmalloc(sizeof(*t)); |
104 | sym_createTable(t); |
105 | n->c = class_create(type, t); |
106 | } |
107 | return (n->c->type == type ? n : 0); |
108 | } |
109 | |
110 | /* --- @name__sanitise@ --- * |
111 | * |
112 | * Arguments: @const char *n@ = pointer to a name |
113 | * @char *buf@ = pointer to a buffer of space |
114 | * @size_t sz@ = size of the buffer |
115 | * |
116 | * Returns: A pointer to the transformed name in the buffer, or null |
117 | * if there wasn't enough space. |
118 | * |
119 | * Use: Transforms a name so that it only contains nice characters. |
120 | */ |
121 | |
122 | static char *name__sanitise(const char *n, char *buf, size_t sz) |
123 | { |
124 | char *p = buf; |
125 | |
126 | if (strlen(n) + 1 > sz) |
127 | return (0); |
128 | |
129 | while (*n) { |
130 | if (isalnum((unsigned char)*n)) |
131 | *p++ = *n; |
132 | else |
133 | *p++ = '_'; |
134 | n++; |
135 | } |
136 | *p++ = 0; |
137 | return (buf); |
138 | } |
139 | |
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140 | /* --- @name__users@ --- * |
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141 | * |
142 | * Arguments: --- |
143 | * |
144 | * Returns: --- |
145 | * |
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146 | * Use: Adds all of the users registered with the user database to |
147 | * the name table. Also adds the users' primary groups. |
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148 | */ |
149 | |
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150 | static void name__users(void) |
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151 | { |
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152 | struct passwd *pw; |
153 | struct group *gr; |
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154 | char buf[32]; |
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155 | |
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156 | userdb_iterateUsers(); |
157 | while ((pw = userdb_nextUser()) != 0) { |
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158 | name *n; |
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159 | int u = pw->pw_uid; |
160 | |
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161 | /* --- First, add the user to the table --- */ |
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162 | |
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163 | if (name__sanitise(pw->pw_name, buf, sizeof(buf)) && |
164 | (n = name__get(buf, clType_user)) != 0) |
165 | sym_find(n->c->t, (char *)&u, sizeof(u), sizeof(sym_base), 0); |
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166 | |
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167 | /* --- Now handle the user's default group --- */ |
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168 | |
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169 | if ((gr = userdb_groupById(pw->pw_gid)) != 0 && |
170 | name__sanitise(gr->gr_name, buf, sizeof(buf)) && |
171 | (n = name__get(buf, clType_user)) != 0) |
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172 | sym_find(n->c->t, (char *)&u, sizeof(u), sizeof(sym_base), 0); |
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173 | } |
174 | } |
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175 | |
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176 | /* --- @name__groups@ --- * |
177 | * |
178 | * Arguments: --- |
179 | * |
180 | * Returns: --- |
181 | * |
182 | * Use: Adds users into all of their supplementary groups. |
183 | */ |
184 | |
185 | static void name__groups(void) |
186 | { |
187 | struct group *gr; |
188 | struct passwd *pw; |
189 | char **p; |
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190 | char buf[32]; |
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191 | |
192 | userdb_iterateGroups(); |
193 | while ((gr = userdb_nextGroup()) != 0) { |
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194 | name *n; |
195 | int u; |
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196 | |
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197 | if (name__sanitise(gr->gr_name, buf, sizeof(buf)) && |
198 | (n = name__get(buf, clType_user)) != 0) { |
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199 | |
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200 | /* --- Now add all of the members --- */ |
201 | |
202 | for (p = gr->gr_mem; *p; p++) { |
203 | if ((pw = userdb_userByName(*p)) != 0) { |
204 | u = pw->pw_uid; |
205 | sym_find(n->c->t, (char *)&u, sizeof(u), sizeof(sym_base), 0); |
206 | } |
207 | } |
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208 | } |
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209 | } |
210 | } |
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211 | |
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212 | /* --- @name__scan@ --- * |
213 | * |
214 | * Arguments: @netg *n@ = the netgroup handle we're scanning |
215 | * @const char *host@ = the host name |
216 | * @const char *user@ = the user name |
217 | * @const char *domain@ = the (NIS?) domain name |
218 | * @void *ctx@ = some context pointer |
219 | * |
220 | * Returns: Zero to continue scanning. |
221 | * |
222 | * Use: Scans a netgroup, adding items to the name table. |
223 | */ |
224 | |
225 | /* --- A data type --- */ |
226 | |
227 | typedef struct name__scanctx { |
228 | char *name; /* Netgroup name prefixed with `?_'*/ |
229 | unsigned f; /* Various interesting flags */ |
230 | name *h; /* Name entry for hosts */ |
231 | name *u; /* Name entry for users */ |
232 | } name__scanctx; |
233 | |
234 | enum { f_host = 1, f_user = 2 }; |
235 | |
236 | /* --- And now for the real code --- */ |
237 | |
238 | static int name__scan(netg *n, const char *host, const char *user, |
239 | const char *domain, void *ctx) |
240 | { |
241 | name__scanctx *sc = ctx; |
242 | |
243 | /* --- Add the host to the hosts class --- */ |
244 | |
245 | if (sc->f & f_host && host) { |
246 | struct hostent *h; |
247 | struct in_addr in; |
248 | const char *a; |
249 | |
250 | /* --- First ensure that I have a host class --- */ |
251 | |
252 | if (!sc->h) { |
253 | sc->name[0] = 'h'; |
254 | sc->h = name__get(sc->name, clType_host); |
255 | if (!sc->h) { |
256 | sc->f &= ~f_host; |
257 | goto done_host; |
258 | } |
259 | } |
260 | |
261 | /* --- Now that I've done that, try to add the host --- * |
262 | * |
263 | * I'll turn it into an IP address. There's less chance of confusion |
264 | * that way. |
265 | */ |
266 | |
267 | if ((h = gethostbyname(host)) == 0) |
268 | goto done_host; |
269 | memcpy(&in, h->h_addr, sizeof(in)); |
270 | if ((a = inet_ntoa(in)) == 0) |
271 | goto done_host; |
272 | sym_find(sc->h->c->t, a, -1, sizeof(sym_base), 0); |
273 | done_host:; |
274 | } |
275 | |
276 | /* --- Add the user to the users class --- */ |
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277 | |
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278 | if (sc->f & f_user && user) { |
279 | struct passwd *pw; |
280 | int u; |
281 | |
282 | /* --- First ensure that I have a user class --- */ |
283 | |
284 | if (!sc->u) { |
285 | sc->name[0] = 'u'; |
286 | sc->u = name__get(sc->name, clType_user); |
287 | if (!sc->u) { |
288 | sc->f &= ~f_user; |
289 | goto done_user; |
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290 | } |
291 | } |
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292 | |
293 | /* --- Add the user to the list --- */ |
294 | |
295 | if ((pw = userdb_userByName(user)) == 0) |
296 | goto done_user; |
297 | u = pw->pw_uid; |
298 | sym_find(sc->u->c->t, (char *)&u, sizeof(u), sizeof(sym_base), 0); |
299 | done_user:; |
300 | } |
301 | |
302 | return (0); |
303 | } |
304 | |
305 | /* --- @name__netgroups@ --- * |
306 | * |
307 | * Arguments: --- |
308 | * |
309 | * Returns: --- |
310 | * |
311 | * Use: Populates the name table with netgroup information. |
312 | */ |
313 | |
314 | void name__netgroups(void) |
315 | { |
316 | netg *n; |
317 | char buf[32]; |
318 | const char *p; |
319 | name__scanctx sc; |
320 | |
321 | netg_iterate(); |
322 | buf[1] = '_'; |
323 | while ((n = netg_next()) != 0) { |
324 | p = netg_name(n); |
325 | if (name__sanitise(p, buf + 2, sizeof(buf) - 2) == 0) |
326 | continue; |
327 | sc.name = buf; |
328 | sc.u = sc.h = 0; |
329 | sc.f = f_host | f_user; |
330 | netg_scan(n, name__scan, &sc); |
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331 | } |
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332 | } |
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333 | |
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334 | /* --- @name_init@ --- * |
335 | * |
336 | * Arguments: --- |
337 | * |
338 | * Returns: --- |
339 | * |
340 | * Use: Initialises the name table. Requires the user database to |
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341 | * be populated (see @userdb_local@ and @userdb_yp@, and |
342 | * @netg_init@). |
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343 | */ |
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344 | |
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345 | void name_init(void) |
346 | { |
347 | /* --- Initialise the name table --- */ |
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348 | |
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349 | sym_createTable(&name__table); |
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350 | |
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351 | /* --- Add everyone into the table --- */ |
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352 | |
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353 | name__users(); |
354 | name__groups(); |
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355 | name__netgroups(); |
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356 | |
357 | /* --- Finally add in the `all' class --- * |
358 | * |
359 | * Do that now, to prevent it being overwritten by the above. |
360 | */ |
361 | |
362 | { |
363 | name *n; |
364 | unsigned f; |
365 | |
366 | n = sym_find(&name__table, "all", -1, sizeof(name), &f); |
367 | if (f) |
368 | class_dec(n->c); |
369 | n->c = class_all; |
370 | } |
371 | } |
372 | |
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373 | /* --- @name_end@ --- * |
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374 | * |
375 | * Arguments: --- |
376 | * |
377 | * Returns: --- |
378 | * |
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379 | * Use: Closes down the name database, so that it can be |
380 | * reinitialised. |
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381 | */ |
382 | |
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383 | void name_end(void) |
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384 | { |
385 | /* --- Empty the symbol table --- */ |
386 | |
387 | { |
388 | sym_iter i; |
389 | name *n; |
390 | |
391 | for (sym_createIter(&i, &name__table); (n = sym_next(&i)) != 0; ) { |
392 | if (n->c) |
393 | class_dec(n->c); |
394 | } |
395 | } |
396 | |
397 | /* --- Destroy and recreate the table --- */ |
398 | |
399 | sym_destroyTable(&name__table); |
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400 | } |
401 | |
402 | /* --- @name_find@ --- * |
403 | * |
404 | * Arguments: @const char *p@ = pointer to name to look up |
405 | * @unsigned create@ = whether to create the item |
406 | * @unsigned *f@ = whether the item was created |
407 | * |
408 | * Returns: Pointer to a @name@ block containing the symbol, or |
409 | * zero if it wasn't found and we didn't want to create a |
410 | * new one. |
411 | * |
412 | * Use: Looks up a name in the symbol table and returns the |
413 | * item so located. |
414 | */ |
415 | |
416 | name *name_find(const char *p, unsigned create, unsigned *f) |
417 | { |
418 | /* --- This is a trivial veneer onto @sym_find@ --- */ |
419 | |
420 | return (sym_find(&name__table, p, -1, create ? sizeof(name) : 0, f)); |
421 | } |
422 | |
423 | /* --- @name_dump@ --- * |
424 | * |
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425 | * Arguments: --- |
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426 | * |
427 | * Returns: --- |
428 | * |
429 | * Use: Dumps a complete listing of the symbol table. |
430 | */ |
431 | |
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432 | void name_dump(void) |
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433 | { |
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434 | #ifdef TRACING |
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435 | sym_iter i; |
436 | name *n; |
437 | |
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438 | trace(TRACE_DEBUG, "name: dumping names"); |
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439 | for (sym_createIter(&i, &name__table); (n = sym_next(&i)) != 0; ) { |
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440 | trace(TRACE_DEBUG, "name: dumping `%s'", n->base.name); |
441 | class_dump(n->c); |
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442 | } |
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443 | #endif |
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444 | } |
445 | |
446 | /*----- Test driver -------------------------------------------------------*/ |
447 | |
448 | #ifdef TEST_RIG |
449 | |
450 | int main(void) |
451 | { |
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452 | ego("name-test"); |
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453 | /* traceon(stdout, TRACE_ALL); */ |
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454 | userdb_init(); |
455 | userdb_local(); |
456 | userdb_yp(); |
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457 | netg_init(); |
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458 | name_init(); |
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459 | printf("loaded (%lu)\n", track_memused()); |
460 | getchar(); |
461 | for (;;) { |
462 | name_end(); |
463 | netg_end(); |
464 | userdb_end(); |
465 | printf("cleared (%lu)\n", track_memused()); |
466 | track_memlist(); |
467 | userdb_init(); |
468 | userdb_local(); |
469 | userdb_yp(); |
470 | netg_init(); |
471 | name_init(); |
472 | printf("reloaded (%lu)\n", track_memused()); |
473 | getchar(); |
474 | } |
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475 | return (0); |
476 | } |
477 | |
478 | #endif |