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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: key-attr.c,v 1.2 2000/02/12 18:21:02 mdw Exp $ |
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4 | * |
5 | * Key attribute manipulation |
6 | * |
7 | * (c) 1999 Straylight/Edgeware |
8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
11 | * |
12 | * This file is part of Catacomb. |
13 | * |
14 | * Catacomb is free software; you can redistribute it and/or modify |
15 | * it under the terms of the GNU Library General Public License as |
16 | * published by the Free Software Foundation; either version 2 of the |
17 | * License, or (at your option) any later version. |
18 | * |
19 | * Catacomb 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 Library General Public License for more details. |
23 | * |
24 | * You should have received a copy of the GNU Library General Public |
25 | * License along with Catacomb; if not, write to the Free |
26 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
27 | * MA 02111-1307, USA. |
28 | */ |
29 | |
30 | /*----- Revision history --------------------------------------------------* |
31 | * |
32 | * $Log: key-attr.c,v $ |
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33 | * Revision 1.2 2000/02/12 18:21:02 mdw |
34 | * Overhaul of key management (again). |
35 | * |
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36 | * Revision 1.1 1999/12/22 15:47:48 mdw |
37 | * Major key-management revision. |
38 | * |
39 | */ |
40 | |
41 | /*----- Header files ------------------------------------------------------*/ |
42 | |
43 | #include <ctype.h> |
44 | #include <stdio.h> |
45 | #include <stdlib.h> |
46 | #include <string.h> |
47 | #include <time.h> |
48 | |
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49 | #include <mLib/dstr.h> |
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50 | #include <mLib/sym.h> |
51 | |
52 | #include "key.h" |
53 | |
54 | /*----- Main code ---------------------------------------------------------*/ |
55 | |
56 | /* --- @key_chkident@ --- * |
57 | * |
58 | * Arguments: @const char *p@ = pointer to a type string |
59 | * |
60 | * Returns: Zero if OK, -1 on error. |
61 | * |
62 | * Use: Checks whether an identification component string is OK. |
63 | */ |
64 | |
65 | int key_chkident(const char *p) |
66 | { |
67 | if (!p || !*p) |
68 | return (-1); |
69 | while (*p) { |
70 | if (*p == ':' || *p == '.' || isspace((unsigned char)*p)) |
71 | return (-1); |
72 | p++; |
73 | } |
74 | return (0); |
75 | } |
76 | |
77 | /* --- @key_chkcomment@ --- * |
78 | * |
79 | * Arguments: @const char *p@ = pointer to a comment string |
80 | * |
81 | * Returns: Zero if OK, -1 on error. |
82 | * |
83 | * Use: Checks whether a comment string is OK. |
84 | */ |
85 | |
86 | int key_chkcomment(const char *p) |
87 | { |
88 | if (!p) |
89 | return (0); |
90 | if (!*p) |
91 | return (-1); |
92 | while (*p) { |
93 | if (*p == '\n') |
94 | return (-1); |
95 | p++; |
96 | } |
97 | return (0); |
98 | } |
99 | |
100 | /* --- @key_mkattriter@ --- * |
101 | * |
102 | * Arguments: @key_attriter *i@ = pointer to attribute iterator |
103 | * @key *k@ = pointer to key |
104 | * |
105 | * Returns: --- |
106 | * |
107 | * Use: Initializes an attribute iterator. The attributes are |
108 | * returned by @key_nextattr@. |
109 | */ |
110 | |
111 | void key_mkattriter(key_attriter *i, key *k) |
112 | { |
113 | sym_mkiter(&i->i, &k->a); |
114 | } |
115 | |
116 | /* --- @key_nextattr@ --- * |
117 | * |
118 | * Arguments: @key_attriter *i@ = pointer to attribute iterator |
119 | * @const char **n, **v@ = pointers to name and value |
120 | * |
121 | * Returns: Zero if no attribute available, or nonzero if returned OK. |
122 | * |
123 | * Use: Returns the next attribute. |
124 | */ |
125 | |
126 | int key_nextattr(key_attriter *i, const char **n, const char **v) |
127 | { |
128 | key_attr *a = sym_next(&i->i); |
129 | if (!a) |
130 | return (0); |
131 | *n = SYM_NAME(a); |
132 | *v = a->p; |
133 | return (1); |
134 | } |
135 | |
136 | /* --- @key_getattr@ --- * |
137 | * |
138 | * Arguments: @key_file *f@ = pointer to file |
139 | * @key *k@ = pointer to key |
140 | * @const char *n@ = pointer to attribute name |
141 | * |
142 | * Returns: Pointer to attribute value, or null if not found. |
143 | * |
144 | * Use: Returns the value of a key attribute. |
145 | */ |
146 | |
147 | const char *key_getattr(key_file *f, key *k, const char *n) |
148 | { |
149 | key_attr *a; |
150 | if ((a = sym_find(&k->a, n, -1, 0, 0)) == 0) |
151 | return (0); |
152 | return (a->p); |
153 | } |
154 | |
155 | /* --- @key_putattr@ --- * |
156 | * |
157 | * Arguments: @key_file *f@ = pointer to file |
158 | * @key *k@ = pointer to key |
159 | * @const char *n@ = pointer to attribute name |
160 | * @const char *v@ = pointer to attribute value or null |
161 | * |
162 | * Returns: Error code (one of the @KERR@ constants). |
163 | * |
164 | * Use: Inserts an attribute on a key. If an attribute with the same |
165 | * name already exists, it is deleted. Setting a null value |
166 | * removes the attribute. |
167 | */ |
168 | |
169 | int key_putattr(key_file *f, key *k, const char *n, const char *v) |
170 | { |
171 | key_attr *a; |
172 | unsigned found; |
173 | |
174 | if (!(f->f & KF_WRITE)) |
175 | return (KERR_READONLY); |
176 | |
177 | if (v) { |
178 | a = sym_find(&k->a, n, -1, sizeof(*a), &found); |
179 | if (found) |
180 | free(a->p); |
181 | a->p = xstrdup(v); |
182 | } else if ((a = sym_find(&k->a, n, -1, 0, 0)) != 0) { |
183 | free(a->p); |
184 | sym_remove(&k->a, a); |
185 | } |
186 | |
187 | f->f |= KF_MODIFIED; |
188 | return (0); |
189 | } |
190 | |
191 | /* --- @key_setcomment@ --- * |
192 | * |
193 | * Arguments: @key_file *f@ = pointer to key file block |
194 | * @key *k@ = pointer to key block |
195 | * @const char *c@ = pointer to comment to set, or zero |
196 | * |
197 | * Returns: Error code (one of the @KERR@ constants). |
198 | * |
199 | * Use: Replaces the key's current comment with a new one. |
200 | */ |
201 | |
202 | int key_setcomment(key_file *f, key *k, const char *c) |
203 | { |
204 | if (!(f->f & KF_WRITE)) |
205 | return (KERR_READONLY); |
206 | if (key_chkcomment(c)) |
207 | return (KERR_BADCOMMENT); |
208 | if (k->c) |
209 | free(k->c); |
210 | if (c) |
211 | k->c = xstrdup(c); |
212 | else |
213 | k->c = 0; |
214 | f->f |= KF_MODIFIED; |
215 | return (0); |
216 | } |
217 | |
218 | /* --- @key_settag@ --- * |
219 | * |
220 | * Arguments: @key_file *f@ = pointer to key file block |
221 | * @key *k@ = pointer to key block |
222 | * @const char *tag@ = pointer to comment to set, or zero |
223 | * |
224 | * Returns: Error code (one of the @KERR@ constants). |
225 | * |
226 | * Use: Replaces the key's current tag with a new one. |
227 | */ |
228 | |
229 | int key_settag(key_file *f, key *k, const char *tag) |
230 | { |
231 | key_ref *kr; |
232 | unsigned found; |
233 | |
234 | if (!(f->f & KF_WRITE)) |
235 | return (KERR_READONLY); |
236 | |
237 | /* --- Make sure the tag is OK --- */ |
238 | |
239 | if (tag && key_chkident(tag)) |
240 | return (KERR_BADTAG); |
241 | |
242 | /* --- See if the new tag is the same as the old one --- */ |
243 | |
244 | if ((!tag && !k->tag) || |
245 | (tag && k->tag && strcmp(tag, k->tag) == 0)) |
246 | return (0); |
247 | |
248 | /* --- Allocate an entry for the new tag --- */ |
249 | |
250 | if (tag) { |
251 | kr = sym_find(&f->bytag, tag, -1, sizeof(*kr), &found); |
252 | if (found) |
253 | return (KERR_DUPTAG); |
254 | kr->k = k; |
255 | } |
256 | |
257 | /* --- Remove any existing tag --- */ |
258 | |
259 | if (k->tag) { |
260 | kr = sym_find(&f->bytag, k->tag, -1, 0, 0); |
261 | assert(((void)"No bytag link", kr)); |
262 | sym_remove(&f->bytag, kr); |
263 | free(k->tag); |
264 | } |
265 | |
266 | /* --- Done --- */ |
267 | |
268 | f->f |= KF_MODIFIED; |
269 | if (tag) |
270 | k->tag = xstrdup(tag); |
271 | else |
272 | k->tag = 0; |
273 | return (0); |
274 | } |
275 | |
276 | /* --- @key_fulltag@ --- * |
277 | * |
278 | * Arguments: @key *k@ = pointer to key |
279 | * @dstr *d@ = pointer to destination string |
280 | * |
281 | * Returns: --- |
282 | * |
283 | * Use: Emits the key's full tag, which has the form |
284 | * `ID:TYPE[:TAG]'. This is used in the textual file format, |
285 | * and to identify passphrases for locked keys. |
286 | */ |
287 | |
288 | void key_fulltag(key *k, dstr *d) |
289 | { |
290 | dstr_putf(d, "%08lx:%s", (unsigned long)k->id, k->type); |
291 | if (k->tag) |
292 | dstr_putf(d, ":%s", k->tag); |
293 | } |
294 | |
295 | /*----- That's all, folks -------------------------------------------------*/ |