c4f2d992 |
1 | /* -*-c-*- |
2 | * |
3 | * $Id: name.c,v 1.1 1997/07/21 13:47:46 mdw Exp $ |
4 | * |
5 | * Looking up of names in symbol tables |
6 | * |
7 | * (c) 1997 EBI |
8 | */ |
9 | |
10 | /*----- Licencing notice --------------------------------------------------* |
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 |
25 | * along with `become'; if not, write to the Free Software |
26 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
27 | */ |
28 | |
29 | /*----- Revision history --------------------------------------------------* |
30 | * |
31 | * $Log: name.c,v $ |
32 | * Revision 1.1 1997/07/21 13:47:46 mdw |
33 | * Initial revision |
34 | * |
35 | */ |
36 | |
37 | /*----- Header files ------------------------------------------------------*/ |
38 | |
39 | /* --- ANSI headers --- */ |
40 | |
41 | #include <stdio.h> |
42 | #include <stdlib.h> |
43 | #include <string.h> |
44 | |
45 | /* --- Unix headers --- */ |
46 | |
47 | #include <grp.h> |
48 | #include <pwd.h> |
49 | |
50 | /* --- Local headers --- */ |
51 | |
52 | #include "class.h" |
53 | #include "name.h" |
54 | #include "sym.h" |
55 | #include "userdb.h" |
56 | #include "utils.h" |
57 | |
58 | /*----- Static variables --------------------------------------------------*/ |
59 | |
60 | static sym_table name__table; /* Symbol table for everything */ |
61 | |
62 | /*----- Main code ---------------------------------------------------------*/ |
63 | |
64 | /* --- @name_init@ --- * |
65 | * |
66 | * Arguments: --- |
67 | * |
68 | * Returns: --- |
69 | * |
70 | * Use: Initialises the name table. Requires the user database to |
71 | * be populated (see @userdb_local@ and @userdb_yp@). |
72 | */ |
73 | |
74 | void name_init(void) |
75 | { |
76 | /* --- Initialise the name table --- */ |
77 | |
78 | sym_createTable(&name__table); |
79 | |
80 | /* --- Insert all the users and groups into the table --- */ |
81 | |
82 | { |
83 | struct passwd *pw; |
84 | struct group *gr; |
85 | |
86 | userdb_iterateUsers(); |
87 | while ((pw = userdb_nextUser()) != 0) { |
88 | unsigned f; |
89 | name *n; |
90 | int u; |
91 | |
92 | /* --- First, add the user to the table --- */ |
93 | |
94 | n = sym_find(&name__table, pw->pw_name, -1, sizeof(name), &f); |
95 | if (!f) { |
96 | sym_table *t = xmalloc(sizeof(*t)); |
97 | sym_createTable(t); |
98 | n->c = class_create(clType_user, t); |
99 | } |
100 | u = pw->pw_uid; |
101 | sym_find(n->c->t, (char *)&u, sizeof(u), sizeof(sym_base), 0); |
102 | |
103 | /* --- Now handle the user's default group --- */ |
104 | |
105 | if ((gr = userdb_groupById(pw->pw_gid)) != 0) { |
106 | n = sym_find(&name__table, gr->gr_name, -1, sizeof(name), &f); |
107 | if (!f) { |
108 | sym_table *t = xmalloc(sizeof(*t)); |
109 | sym_createTable(t); |
110 | n->c = class_create(clType_user, t); |
111 | } |
112 | sym_find(n->c->t, (char *)&u, sizeof(u), sizeof(sym_base), 0); |
113 | } |
114 | } |
115 | } |
116 | |
117 | /* --- Now get the subsidiary groups --- */ |
118 | |
119 | { |
120 | struct group *gr; |
121 | struct passwd *pw; |
122 | char **p; |
123 | |
124 | userdb_iterateGroups(); |
125 | while ((gr = userdb_nextGroup()) != 0) { |
126 | unsigned f; |
127 | name *n; |
128 | int u; |
129 | |
130 | n = sym_find(&name__table, gr->gr_name, -1, sizeof(name), &f); |
131 | if (!f) { |
132 | sym_table *t = xmalloc(sizeof(*t)); |
133 | sym_createTable(t); |
134 | n->c = class_create(clType_user, t); |
135 | } |
136 | |
137 | for (p = gr->gr_mem; *p; p++) { |
138 | if ((pw = userdb_userByName(*p)) != 0) { |
139 | u = pw->pw_uid; |
140 | sym_find(n->c->t, (char *)&u, sizeof(u), sizeof(sym_base), 0); |
141 | } |
142 | } |
143 | } |
144 | } |
145 | |
146 | /* --- Finally add in the `all' class --- * |
147 | * |
148 | * Do that now, to prevent it being overwritten by the above. |
149 | */ |
150 | |
151 | { |
152 | name *n; |
153 | unsigned f; |
154 | |
155 | n = sym_find(&name__table, "all", -1, sizeof(name), &f); |
156 | if (f) |
157 | class_dec(n->c); |
158 | n->c = class_all; |
159 | } |
160 | } |
161 | |
162 | /* --- @name_reinit@ --- * |
163 | * |
164 | * Arguments: --- |
165 | * |
166 | * Returns: --- |
167 | * |
168 | * Use: Reinitialises the names table. It's cleared and then |
169 | * initialised with the current user and group ids as for |
170 | * @name_init@ above. |
171 | */ |
172 | |
173 | void name_reinit(void) |
174 | { |
175 | /* --- Empty the symbol table --- */ |
176 | |
177 | { |
178 | sym_iter i; |
179 | name *n; |
180 | |
181 | for (sym_createIter(&i, &name__table); (n = sym_next(&i)) != 0; ) { |
182 | if (n->c) |
183 | class_dec(n->c); |
184 | } |
185 | } |
186 | |
187 | /* --- Destroy and recreate the table --- */ |
188 | |
189 | sym_destroyTable(&name__table); |
190 | name_init(); |
191 | } |
192 | |
193 | /* --- @name_find@ --- * |
194 | * |
195 | * Arguments: @const char *p@ = pointer to name to look up |
196 | * @unsigned create@ = whether to create the item |
197 | * @unsigned *f@ = whether the item was created |
198 | * |
199 | * Returns: Pointer to a @name@ block containing the symbol, or |
200 | * zero if it wasn't found and we didn't want to create a |
201 | * new one. |
202 | * |
203 | * Use: Looks up a name in the symbol table and returns the |
204 | * item so located. |
205 | */ |
206 | |
207 | name *name_find(const char *p, unsigned create, unsigned *f) |
208 | { |
209 | /* --- This is a trivial veneer onto @sym_find@ --- */ |
210 | |
211 | return (sym_find(&name__table, p, -1, create ? sizeof(name) : 0, f)); |
212 | } |
213 | |
214 | /* --- @name_dump@ --- * |
215 | * |
216 | * Arguments: @FILE *fp@ = stream to dump on |
217 | * |
218 | * Returns: --- |
219 | * |
220 | * Use: Dumps a complete listing of the symbol table. |
221 | */ |
222 | |
223 | void name_dump(FILE *fp) |
224 | { |
225 | sym_iter i; |
226 | name *n; |
227 | |
228 | for (sym_createIter(&i, &name__table); (n = sym_next(&i)) != 0; ) { |
229 | fprintf(fp, "\n--- name `%s'\n", n->base.name); |
230 | class_dump(n->c, fp); |
231 | } |
232 | } |
233 | |
234 | /*----- Test driver -------------------------------------------------------*/ |
235 | |
236 | #ifdef TEST_RIG |
237 | |
238 | int main(void) |
239 | { |
240 | userdb_init(); |
241 | userdb_local(); |
242 | userdb_yp(); |
243 | name_init(); |
244 | name_dump(stdout); |
245 | return (0); |
246 | } |
247 | |
248 | #endif |