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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: name.c,v 1.6 1998/01/12 16:46:14 mdw Exp $ |
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4 | * |
5 | * Looking up of names in symbol tables |
6 | * |
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7 | * (c) 1998 EBI |
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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 1.6 1998/01/12 16:46:14 mdw |
33 | * Fix copyright date. |
34 | * |
35 | * Revision 1.5 1997/09/17 10:26:11 mdw |
2e11036b |
36 | * Use rewritten class handler. Support `none' class. |
37 | * |
38 | * Revision 1.4 1997/08/20 16:17:59 mdw |
e6677daf |
39 | * Replace `name_reinit' by `name_end' for more sensible restart. |
40 | * |
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41 | * Revision 1.3 1997/08/07 09:49:39 mdw |
42 | * Extensive modifications to handle netgroups. Also sanitise user and group |
43 | * names before adding them to the symbol table. |
44 | * |
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45 | * Revision 1.2 1997/08/04 10:24:24 mdw |
46 | * Sources placed under CVS control. |
47 | * |
48 | * Revision 1.1 1997/07/21 13:47:46 mdw |
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49 | * Initial revision |
50 | * |
51 | */ |
52 | |
53 | /*----- Header files ------------------------------------------------------*/ |
54 | |
55 | /* --- ANSI headers --- */ |
56 | |
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57 | #include <ctype.h> |
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58 | #include <stdio.h> |
59 | #include <stdlib.h> |
60 | #include <string.h> |
61 | |
62 | /* --- Unix headers --- */ |
63 | |
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64 | #include <sys/types.h> |
65 | #include <sys/socket.h> |
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66 | |
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67 | #include <netinet/in.h> |
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68 | |
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69 | #include <arpa/inet.h> |
70 | |
71 | #include <netdb.h> |
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72 | #include <grp.h> |
73 | #include <pwd.h> |
74 | |
75 | /* --- Local headers --- */ |
76 | |
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77 | #include "config.h" |
78 | |
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79 | #include "become.h" |
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80 | #include "class.h" |
81 | #include "name.h" |
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82 | #include "netg.h" |
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83 | #include "sym.h" |
84 | #include "userdb.h" |
85 | #include "utils.h" |
86 | |
87 | /*----- Static variables --------------------------------------------------*/ |
88 | |
89 | static sym_table name__table; /* Symbol table for everything */ |
90 | |
91 | /*----- Main code ---------------------------------------------------------*/ |
92 | |
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93 | /* --- @name__get@ --- * |
94 | * |
95 | * Arguments: @const char *p@ = pointer to the name we want |
96 | * @unsigned type@ = type of class it should have |
97 | * |
98 | * Returns: A pointer to a name ready to use, or zero if there's a type |
99 | * conflict. |
100 | * |
101 | * Use: Creates a name of the appropriate type all ready to use. |
102 | */ |
103 | |
104 | static name *name__get(const char *p, unsigned type) |
105 | { |
106 | unsigned f; |
107 | name *n = sym_find(&name__table, p, -1, sizeof(*n), &f); |
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108 | if (!f) |
109 | n->c = 0; |
110 | return ((n->c && !(n->c->type & type)) ? 0 : n); |
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111 | } |
112 | |
113 | /* --- @name__sanitise@ --- * |
114 | * |
115 | * Arguments: @const char *n@ = pointer to a name |
116 | * @char *buf@ = pointer to a buffer of space |
117 | * @size_t sz@ = size of the buffer |
118 | * |
119 | * Returns: A pointer to the transformed name in the buffer, or null |
120 | * if there wasn't enough space. |
121 | * |
122 | * Use: Transforms a name so that it only contains nice characters. |
123 | */ |
124 | |
125 | static char *name__sanitise(const char *n, char *buf, size_t sz) |
126 | { |
127 | char *p = buf; |
128 | |
129 | if (strlen(n) + 1 > sz) |
130 | return (0); |
131 | |
132 | while (*n) { |
133 | if (isalnum((unsigned char)*n)) |
134 | *p++ = *n; |
135 | else |
136 | *p++ = '_'; |
137 | n++; |
138 | } |
139 | *p++ = 0; |
140 | return (buf); |
141 | } |
142 | |
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143 | /* --- @name__users@ --- * |
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144 | * |
145 | * Arguments: --- |
146 | * |
147 | * Returns: --- |
148 | * |
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149 | * Use: Adds all of the users registered with the user database to |
150 | * the name table. Also adds the users' primary groups. |
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151 | */ |
152 | |
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153 | static void name__users(void) |
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154 | { |
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155 | struct passwd *pw; |
156 | struct group *gr; |
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157 | char buf[32]; |
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158 | |
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159 | userdb_iterateUsers(); |
160 | while ((pw = userdb_nextUser()) != 0) { |
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161 | name *n; |
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162 | uid_t u = pw->pw_uid; |
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163 | |
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164 | /* --- First, add the user to the table --- */ |
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165 | |
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166 | if (name__sanitise(pw->pw_name, buf, sizeof(buf)) && |
167 | (n = name__get(buf, clType_user)) != 0) |
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168 | n->c = class_addUser(n->c, u); |
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169 | |
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170 | /* --- Now handle the user's default group --- */ |
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171 | |
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172 | if ((gr = userdb_groupById(pw->pw_gid)) != 0 && |
173 | name__sanitise(gr->gr_name, buf, sizeof(buf)) && |
174 | (n = name__get(buf, clType_user)) != 0) |
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175 | n->c = class_addUser(n->c, u); |
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176 | } |
177 | } |
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178 | |
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179 | /* --- @name__groups@ --- * |
180 | * |
181 | * Arguments: --- |
182 | * |
183 | * Returns: --- |
184 | * |
185 | * Use: Adds users into all of their supplementary groups. |
186 | */ |
187 | |
188 | static void name__groups(void) |
189 | { |
190 | struct group *gr; |
191 | struct passwd *pw; |
192 | char **p; |
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193 | char buf[32]; |
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194 | |
195 | userdb_iterateGroups(); |
196 | while ((gr = userdb_nextGroup()) != 0) { |
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197 | name *n; |
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198 | |
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199 | if (name__sanitise(gr->gr_name, buf, sizeof(buf)) && |
200 | (n = name__get(buf, clType_user)) != 0) { |
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201 | |
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202 | /* --- Now add all of the members --- */ |
203 | |
204 | for (p = gr->gr_mem; *p; p++) { |
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205 | if ((pw = userdb_userByName(*p)) != 0) |
206 | n->c = class_addUser(n->c, pw->pw_uid); |
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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; |
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272 | sc->h->c = class_addString(sc->h->c, a); |
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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; |
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280 | |
281 | /* --- First ensure that I have a user class --- */ |
282 | |
283 | if (!sc->u) { |
284 | sc->name[0] = 'u'; |
285 | sc->u = name__get(sc->name, clType_user); |
286 | if (!sc->u) { |
287 | sc->f &= ~f_user; |
288 | goto done_user; |
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289 | } |
290 | } |
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291 | |
292 | /* --- Add the user to the list --- */ |
293 | |
294 | if ((pw = userdb_userByName(user)) == 0) |
295 | goto done_user; |
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296 | sc->u->c = class_addUser(sc->u->c, pw->pw_uid); |
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297 | done_user:; |
298 | } |
299 | |
300 | return (0); |
301 | } |
302 | |
303 | /* --- @name__netgroups@ --- * |
304 | * |
305 | * Arguments: --- |
306 | * |
307 | * Returns: --- |
308 | * |
309 | * Use: Populates the name table with netgroup information. |
310 | */ |
311 | |
312 | void name__netgroups(void) |
313 | { |
314 | netg *n; |
315 | char buf[32]; |
316 | const char *p; |
317 | name__scanctx sc; |
318 | |
319 | netg_iterate(); |
320 | buf[1] = '_'; |
321 | while ((n = netg_next()) != 0) { |
322 | p = netg_name(n); |
323 | if (name__sanitise(p, buf + 2, sizeof(buf) - 2) == 0) |
324 | continue; |
325 | sc.name = buf; |
326 | sc.u = sc.h = 0; |
327 | sc.f = f_host | f_user; |
328 | netg_scan(n, name__scan, &sc); |
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329 | } |
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330 | } |
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331 | |
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332 | /* --- @name_init@ --- * |
333 | * |
334 | * Arguments: --- |
335 | * |
336 | * Returns: --- |
337 | * |
338 | * Use: Initialises the name table. Requires the user database to |
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339 | * be populated (see @userdb_local@ and @userdb_yp@, and |
340 | * @netg_init@). |
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341 | */ |
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342 | |
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343 | void name_init(void) |
344 | { |
345 | /* --- Initialise the name table --- */ |
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346 | |
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347 | sym_createTable(&name__table); |
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348 | |
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349 | /* --- Add everyone into the table --- */ |
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350 | |
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351 | name__users(); |
352 | name__groups(); |
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353 | name__netgroups(); |
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354 | |
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355 | /* --- Finally add in the `all' and `none' classes --- * |
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356 | * |
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357 | * Do that now, to prevent them being overwritten by the above. |
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358 | */ |
359 | |
360 | { |
361 | name *n; |
362 | unsigned f; |
363 | |
364 | n = sym_find(&name__table, "all", -1, sizeof(name), &f); |
365 | if (f) |
366 | class_dec(n->c); |
367 | n->c = class_all; |
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368 | |
369 | n = sym_find(&name__table, "none", -1, sizeof(name), &f); |
370 | if (f) |
371 | class_dec(n->c); |
372 | n->c = class_none; |
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373 | } |
374 | } |
375 | |
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376 | /* --- @name_end@ --- * |
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377 | * |
378 | * Arguments: --- |
379 | * |
380 | * Returns: --- |
381 | * |
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382 | * Use: Closes down the name database, so that it can be |
383 | * reinitialised. |
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384 | */ |
385 | |
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386 | void name_end(void) |
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387 | { |
388 | /* --- Empty the symbol table --- */ |
389 | |
390 | { |
391 | sym_iter i; |
392 | name *n; |
393 | |
394 | for (sym_createIter(&i, &name__table); (n = sym_next(&i)) != 0; ) { |
395 | if (n->c) |
396 | class_dec(n->c); |
397 | } |
398 | } |
399 | |
400 | /* --- Destroy and recreate the table --- */ |
401 | |
402 | sym_destroyTable(&name__table); |
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403 | } |
404 | |
405 | /* --- @name_find@ --- * |
406 | * |
407 | * Arguments: @const char *p@ = pointer to name to look up |
408 | * @unsigned create@ = whether to create the item |
409 | * @unsigned *f@ = whether the item was created |
410 | * |
411 | * Returns: Pointer to a @name@ block containing the symbol, or |
412 | * zero if it wasn't found and we didn't want to create a |
413 | * new one. |
414 | * |
415 | * Use: Looks up a name in the symbol table and returns the |
416 | * item so located. |
417 | */ |
418 | |
419 | name *name_find(const char *p, unsigned create, unsigned *f) |
420 | { |
421 | /* --- This is a trivial veneer onto @sym_find@ --- */ |
422 | |
423 | return (sym_find(&name__table, p, -1, create ? sizeof(name) : 0, f)); |
424 | } |
425 | |
426 | /* --- @name_dump@ --- * |
427 | * |
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428 | * Arguments: --- |
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429 | * |
430 | * Returns: --- |
431 | * |
432 | * Use: Dumps a complete listing of the symbol table. |
433 | */ |
434 | |
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435 | void name_dump(void) |
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436 | { |
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437 | #ifdef TRACING |
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438 | sym_iter i; |
439 | name *n; |
440 | |
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441 | trace(TRACE_DEBUG, "name: dumping names"); |
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442 | for (sym_createIter(&i, &name__table); (n = sym_next(&i)) != 0; ) { |
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443 | trace(TRACE_DEBUG, "name: dumping `%s'", n->base.name); |
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444 | class_dump(n->c, 1); |
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445 | } |
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446 | #endif |
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447 | } |
448 | |
449 | /*----- Test driver -------------------------------------------------------*/ |
450 | |
451 | #ifdef TEST_RIG |
452 | |
453 | int main(void) |
454 | { |
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455 | ego("name-test"); |
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456 | /* traceon(stdout, TRACE_ALL); */ |
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457 | userdb_init(); |
458 | userdb_local(); |
459 | userdb_yp(); |
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460 | netg_init(); |
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461 | name_init(); |
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462 | printf("loaded (%lu)\n", track_memused()); |
463 | getchar(); |
464 | for (;;) { |
465 | name_end(); |
466 | netg_end(); |
467 | userdb_end(); |
468 | printf("cleared (%lu)\n", track_memused()); |
469 | track_memlist(); |
470 | userdb_init(); |
471 | userdb_local(); |
472 | userdb_yp(); |
473 | netg_init(); |
474 | name_init(); |
475 | printf("reloaded (%lu)\n", track_memused()); |
476 | getchar(); |
477 | } |
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478 | return (0); |
479 | } |
480 | |
481 | #endif |