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