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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: name.c,v 1.2 1997/08/04 10:24:24 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 1.2 1997/08/04 10:24:24 mdw |
33 | * Sources placed under CVS control. |
34 | * |
35 | * Revision 1.1 1997/07/21 13:47:46 mdw |
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36 | * Initial revision |
37 | * |
38 | */ |
39 | |
40 | /*----- Header files ------------------------------------------------------*/ |
41 | |
42 | /* --- ANSI headers --- */ |
43 | |
44 | #include <stdio.h> |
45 | #include <stdlib.h> |
46 | #include <string.h> |
47 | |
48 | /* --- Unix headers --- */ |
49 | |
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50 | #include "config.h" |
51 | |
52 | #ifdef HAVE_YP |
53 | # include <rpcsvc/ypclnt.h> |
54 | # include <rpcsvc/yp_prot.h> |
55 | #endif |
56 | |
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57 | #include <grp.h> |
58 | #include <pwd.h> |
59 | |
60 | /* --- Local headers --- */ |
61 | |
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62 | #include "become.h" |
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63 | #include "class.h" |
64 | #include "name.h" |
65 | #include "sym.h" |
66 | #include "userdb.h" |
67 | #include "utils.h" |
68 | |
69 | /*----- Static variables --------------------------------------------------*/ |
70 | |
71 | static sym_table name__table; /* Symbol table for everything */ |
72 | |
73 | /*----- Main code ---------------------------------------------------------*/ |
74 | |
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75 | /* --- @name__users@ --- * |
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76 | * |
77 | * Arguments: --- |
78 | * |
79 | * Returns: --- |
80 | * |
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81 | * Use: Adds all of the users registered with the user database to |
82 | * the name table. Also adds the users' primary groups. |
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83 | */ |
84 | |
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85 | static void name__users(void) |
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86 | { |
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87 | struct passwd *pw; |
88 | struct group *gr; |
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89 | |
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90 | userdb_iterateUsers(); |
91 | while ((pw = userdb_nextUser()) != 0) { |
92 | unsigned f; |
93 | name *n; |
94 | int u; |
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95 | |
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96 | /* --- First, add the user to the table --- */ |
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97 | |
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98 | n = sym_find(&name__table, pw->pw_name, -1, sizeof(name), &f); |
99 | if (!f) { |
100 | sym_table *t = xmalloc(sizeof(*t)); |
101 | sym_createTable(t); |
102 | n->c = class_create(clType_user, t); |
103 | } |
104 | u = pw->pw_uid; |
105 | sym_find(n->c->t, (char *)&u, sizeof(u), sizeof(sym_base), 0); |
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106 | |
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107 | /* --- Now handle the user's default group --- */ |
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108 | |
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109 | if ((gr = userdb_groupById(pw->pw_gid)) != 0) { |
110 | n = sym_find(&name__table, gr->gr_name, -1, sizeof(name), &f); |
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111 | if (!f) { |
112 | sym_table *t = xmalloc(sizeof(*t)); |
113 | sym_createTable(t); |
114 | n->c = class_create(clType_user, t); |
115 | } |
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116 | sym_find(n->c->t, (char *)&u, sizeof(u), sizeof(sym_base), 0); |
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117 | } |
118 | } |
119 | } |
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120 | |
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121 | /* --- @name__groups@ --- * |
122 | * |
123 | * Arguments: --- |
124 | * |
125 | * Returns: --- |
126 | * |
127 | * Use: Adds users into all of their supplementary groups. |
128 | */ |
129 | |
130 | static void name__groups(void) |
131 | { |
132 | struct group *gr; |
133 | struct passwd *pw; |
134 | char **p; |
135 | |
136 | userdb_iterateGroups(); |
137 | while ((gr = userdb_nextGroup()) != 0) { |
138 | unsigned f; |
139 | name *n; |
140 | int u; |
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141 | |
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142 | /* --- Add the group name to the table --- */ |
143 | |
144 | n = sym_find(&name__table, gr->gr_name, -1, sizeof(name), &f); |
145 | if (!f) { |
146 | sym_table *t = xmalloc(sizeof(*t)); |
147 | sym_createTable(t); |
148 | n->c = class_create(clType_user, t); |
149 | } |
150 | |
151 | /* --- Now add all of the members --- */ |
152 | |
153 | for (p = gr->gr_mem; *p; p++) { |
154 | if ((pw = userdb_userByName(*p)) != 0) { |
155 | u = pw->pw_uid; |
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156 | sym_find(n->c->t, (char *)&u, sizeof(u), sizeof(sym_base), 0); |
157 | } |
158 | } |
159 | } |
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160 | } |
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161 | |
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162 | /* --- @name_init@ --- * |
163 | * |
164 | * Arguments: --- |
165 | * |
166 | * Returns: --- |
167 | * |
168 | * Use: Initialises the name table. Requires the user database to |
169 | * be populated (see @userdb_local@ and @userdb_yp@). |
170 | */ |
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171 | |
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172 | void name_init(void) |
173 | { |
174 | /* --- Initialise the name table --- */ |
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175 | |
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176 | sym_createTable(&name__table); |
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177 | |
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178 | /* --- Add everyone into the table --- */ |
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179 | |
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180 | name__users(); |
181 | name__groups(); |
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182 | |
183 | /* --- Finally add in the `all' class --- * |
184 | * |
185 | * Do that now, to prevent it being overwritten by the above. |
186 | */ |
187 | |
188 | { |
189 | name *n; |
190 | unsigned f; |
191 | |
192 | n = sym_find(&name__table, "all", -1, sizeof(name), &f); |
193 | if (f) |
194 | class_dec(n->c); |
195 | n->c = class_all; |
196 | } |
197 | } |
198 | |
199 | /* --- @name_reinit@ --- * |
200 | * |
201 | * Arguments: --- |
202 | * |
203 | * Returns: --- |
204 | * |
205 | * Use: Reinitialises the names table. It's cleared and then |
206 | * initialised with the current user and group ids as for |
207 | * @name_init@ above. |
208 | */ |
209 | |
210 | void name_reinit(void) |
211 | { |
212 | /* --- Empty the symbol table --- */ |
213 | |
214 | { |
215 | sym_iter i; |
216 | name *n; |
217 | |
218 | for (sym_createIter(&i, &name__table); (n = sym_next(&i)) != 0; ) { |
219 | if (n->c) |
220 | class_dec(n->c); |
221 | } |
222 | } |
223 | |
224 | /* --- Destroy and recreate the table --- */ |
225 | |
226 | sym_destroyTable(&name__table); |
227 | name_init(); |
228 | } |
229 | |
230 | /* --- @name_find@ --- * |
231 | * |
232 | * Arguments: @const char *p@ = pointer to name to look up |
233 | * @unsigned create@ = whether to create the item |
234 | * @unsigned *f@ = whether the item was created |
235 | * |
236 | * Returns: Pointer to a @name@ block containing the symbol, or |
237 | * zero if it wasn't found and we didn't want to create a |
238 | * new one. |
239 | * |
240 | * Use: Looks up a name in the symbol table and returns the |
241 | * item so located. |
242 | */ |
243 | |
244 | name *name_find(const char *p, unsigned create, unsigned *f) |
245 | { |
246 | /* --- This is a trivial veneer onto @sym_find@ --- */ |
247 | |
248 | return (sym_find(&name__table, p, -1, create ? sizeof(name) : 0, f)); |
249 | } |
250 | |
251 | /* --- @name_dump@ --- * |
252 | * |
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253 | * Arguments: --- |
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254 | * |
255 | * Returns: --- |
256 | * |
257 | * Use: Dumps a complete listing of the symbol table. |
258 | */ |
259 | |
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260 | void name_dump(void) |
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261 | { |
262 | sym_iter i; |
263 | name *n; |
264 | |
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265 | trace(TRACE_DEBUG, "name: dumping names"); |
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266 | for (sym_createIter(&i, &name__table); (n = sym_next(&i)) != 0; ) { |
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267 | trace(TRACE_DEBUG, "name: dumping `%s'", n->base.name); |
268 | class_dump(n->c); |
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269 | } |
270 | } |
271 | |
272 | /*----- Test driver -------------------------------------------------------*/ |
273 | |
274 | #ifdef TEST_RIG |
275 | |
276 | int main(void) |
277 | { |
278 | userdb_init(); |
279 | userdb_local(); |
280 | userdb_yp(); |
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281 | ego("name-test"); |
282 | traceon(stdout, TRACE_DEBUG); |
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283 | name_init(); |
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284 | name_dump(); |
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285 | return (0); |
286 | } |
287 | |
288 | #endif |