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1 | /* -*-c-*- |
2 | * |
9f1b58fe |
3 | * $Id: key.h,v 1.8 2001/02/03 11:57:38 mdw Exp $ |
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4 | * |
5 | * Simple key management |
6 | * |
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7 | * (c) 1999 Straylight/Edgeware |
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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.h,v $ |
9f1b58fe |
33 | * Revision 1.8 2001/02/03 11:57:38 mdw |
34 | * Allow creating keyfiles with no file attached. |
35 | * |
16efd15b |
36 | * Revision 1.7 2000/12/06 20:33:27 mdw |
37 | * Make flags be macros rather than enumerations, to ensure that they're |
38 | * unsigned. |
39 | * |
cae5cb8e |
40 | * Revision 1.6 2000/06/17 11:27:43 mdw |
41 | * Add key fetching interface. |
42 | * |
86a47753 |
43 | * Revision 1.5 2000/02/12 18:55:40 mdw |
44 | * Make it all compile properly. |
45 | * |
052b36d0 |
46 | * Revision 1.4 2000/02/12 18:21:02 mdw |
47 | * Overhaul of key management (again). |
48 | * |
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49 | * Revision 1.3 1999/12/22 15:47:48 mdw |
50 | * Major key-management revision. |
51 | * |
b3f05084 |
52 | * Revision 1.2 1999/12/10 23:29:48 mdw |
53 | * Change header file guard names. |
54 | * |
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55 | * Revision 1.1 1999/09/03 08:41:12 mdw |
56 | * Initial import. |
57 | * |
58 | */ |
59 | |
b3f05084 |
60 | #ifndef CATACOMB_KEY_H |
61 | #define CATACOMB_KEY_H |
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62 | |
63 | #ifdef __cplusplus |
64 | extern "C" { |
65 | #endif |
66 | |
67 | /*----- Header files ------------------------------------------------------*/ |
68 | |
69 | #include <stdio.h> |
70 | #include <time.h> |
71 | |
72 | #include <mLib/bits.h> |
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73 | #include <mLib/dstr.h> |
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74 | #include <mLib/hash.h> |
75 | #include <mLib/sym.h> |
76 | |
052b36d0 |
77 | #ifndef CATACOMB_KEY_DATA_H |
78 | # include "key-data.h" |
79 | #endif |
80 | |
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81 | #ifndef CATACOMB_MP_H |
82 | # include "mp.h" |
83 | #endif |
84 | |
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85 | /*----- Data structures ---------------------------------------------------*/ |
86 | |
87 | /* --- Key attributes --- * |
88 | * |
89 | * Each attribute is stored as a symbol in a symbol table. The value is |
90 | * the plain (not url-encoded) text to be written to the the file. If the |
91 | * value is binary data, then by this point it's base-64 encoded. |
92 | */ |
93 | |
94 | typedef struct key_attr { |
95 | sym_base _b; /* Symbol table data */ |
96 | char *p; /* Pointer to attribute value */ |
97 | } key_attr; |
98 | |
99 | /* --- Main key structure --- * |
100 | * |
101 | * Each key is stored in two symbol tables, one indexed by keyid, and the |
102 | * other indexed by type. Because many keys can have the same type, the type |
103 | * table contains a list of keys, sorted in descending order of expiry. |
104 | */ |
105 | |
106 | typedef struct key { |
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107 | |
108 | /* --- Hashtable management --- */ |
109 | |
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110 | hash_base _b; /* Symbol table data */ |
111 | struct key *next; /* Next key of the same type */ |
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112 | |
113 | /* --- Basic key attributes --- */ |
114 | |
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115 | uint32 id; /* Key id used to name it */ |
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116 | char *tag; /* Textual tag name */ |
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117 | char *type; /* Textual key type */ |
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118 | time_t exp, del; /* Expiry times for keys */ |
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119 | |
120 | /* --- The key data itself --- */ |
121 | |
122 | key_data k; /* The actual key data */ |
123 | |
124 | /* --- Other attributes and commentary --- */ |
125 | |
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126 | sym_table a; /* Hashtable of key attributes */ |
127 | char *c; /* Any additional comments */ |
128 | } key; |
129 | |
130 | /* --- The keys-by-type entries --- */ |
131 | |
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132 | typedef struct key_ref { |
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133 | sym_base _b; /* Symbol table data */ |
134 | key *k; /* Pointer to first key in list */ |
d11a0bf7 |
135 | } key_ref; |
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136 | |
137 | /* --- A key file --- */ |
138 | |
139 | typedef struct key_file { |
140 | FILE *fp; /* File pointer open on file */ |
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141 | char *name; /* Filename used to create it */ |
142 | unsigned f; /* Various useful flags */ |
143 | hash_table byid; /* Table of keys by keyid */ |
144 | sym_table bytype; /* Table of keys by type */ |
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145 | sym_table bytag; /* Table of keys by tag */ |
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146 | size_t idload; /* Loading on id table */ |
147 | } key_file; |
148 | |
149 | /* --- Key file flags --- */ |
150 | |
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151 | #define KF_WRITE 1u /* File opened for writing */ |
152 | #define KF_MODIFIED 2u /* File has been modified */ |
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153 | |
154 | /* --- Iterating over keys --- * |
155 | * |
156 | * Both of these are simple symbol table iterators, but they're made distinct |
157 | * types for the dubious benefits that type safety brings. |
158 | */ |
159 | |
160 | typedef struct { hash_iter i; time_t t; } key_iter; |
161 | typedef struct { sym_iter i; } key_attriter; |
162 | |
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163 | /* --- Key fetching --- */ |
164 | |
165 | typedef struct key_fetchdef { |
166 | char *name; /* Name of item */ |
167 | size_t off; /* Offset into target structure */ |
168 | unsigned e; /* Flags for the item */ |
169 | const struct key_fetchdef *kf; /* Substructure pointer */ |
170 | } key_fetchdef; |
171 | |
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172 | /* --- File opening options --- */ |
173 | |
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174 | #define KOPEN_READ 0u |
175 | #define KOPEN_WRITE 1u |
176 | #define KOPEN_MASK 0xff |
177 | #define KOPEN_NOFILE 0x100 |
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178 | |
179 | /* --- Various other magic numbers --- */ |
180 | |
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181 | #define KEXP_FOREVER ((time_t)-1) /* Never expire this key */ |
182 | #define KEXP_EXPIRE ((time_t)-2) /* Expire this key when unused */ |
183 | |
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184 | /* --- Key error codes --- */ |
185 | |
186 | enum { |
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187 | KERR_OK = 0, /* No error */ |
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188 | KERR_BADTAG = -1, /* Malformed tag string */ |
189 | KERR_BADTYPE = -2, /* Malformed type string */ |
190 | KERR_BADCOMMENT = -3, /* Malformed comment string */ |
191 | KERR_DUPID = -4, /* Duplicate keyid */ |
192 | KERR_DUPTAG = -5, /* Duplicate key tag string */ |
193 | KERR_READONLY = -6, /* Key file is read-only */ |
194 | KERR_WILLEXPIRE = -7, /* Key will eventually expire */ |
195 | KERR_EXPIRED = -8, /* Key has already expired */ |
196 | KERR_BADFLAGS = -9, /* Error in flags string */ |
052b36d0 |
197 | KERR_BADPASS = -10, /* Error decrypting locked key */ |
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198 | KERR_WRONGTYPE = -11, /* Key has incorrect type */ |
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199 | KERR_NOTFOUND = -12, /* Key couldn't be found */ |
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200 | KERR_MAX /* Largest possible error */ |
201 | }; |
202 | |
203 | /* --- Write error codes --- */ |
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204 | |
205 | enum { |
206 | KWRITE_OK, /* Everything went fine */ |
207 | KWRITE_FAIL = -1, /* Close attempt failed */ |
208 | KWRITE_BROKEN = -2 /* Key ring needs manual fixing */ |
209 | }; |
210 | |
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211 | /* --- Error reporting functions for @key_merge@ and @key_open@ --- */ |
212 | |
213 | typedef void key_reporter(const char */*file*/, int /*line*/, |
214 | const char */*err*/, void */*p*/); |
215 | |
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216 | /* --- Macros for testing expiry --- */ |
217 | |
218 | #define KEY_EXPIRED(now, exp) \ |
219 | ((exp) == KEXP_EXPIRE || ((exp) != KEXP_FOREVER && (exp) < (now))) |
220 | |
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221 | /*----- Reading and writing keys and files --------------------------------*/ |
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222 | |
223 | /* --- @key_merge@ --- * |
224 | * |
225 | * Arguments: @key_file *f@ = pointer to file structure |
226 | * @const char *file@ = name of file (for error messages) |
227 | * @FILE *fp@ = file handle to read from |
d11a0bf7 |
228 | * @key_reporter *rep@ = error reporting function |
229 | * @void *arg@ = argument for function |
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230 | * |
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231 | * Returns: Error code (one of the @KERR@ constants). |
d03ab969 |
232 | * |
233 | * Use: Reads keys from a file, and inserts them into the file. |
234 | */ |
235 | |
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236 | extern int key_merge(key_file */*f*/, const char */*file*/, FILE */*fp*/, |
237 | key_reporter */*rep*/, void */*arg*/); |
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238 | |
239 | /* --- @key_extract@ --- * |
240 | * |
241 | * Arguments: @key_file *f@ = pointer to file structure |
242 | * @key *k@ = key to extract |
243 | * @FILE *fp@ = file to write on |
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244 | * @const key_filter *kf@ = pointer to key selection block |
d03ab969 |
245 | * |
246 | * Returns: Zero if OK, EOF on error. |
247 | * |
248 | * Use: Extracts a key to an ouptut file. |
249 | */ |
250 | |
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251 | extern int key_extract(key_file */*f*/, key */*k*/, FILE */*fp*/, |
252 | const key_filter */*kf*/); |
d03ab969 |
253 | |
254 | /* --- @key_open@ --- * |
255 | * |
256 | * Arguments: @key_file *f@ = pointer to file structure to initialize |
257 | * @const char *file@ = pointer to the file name |
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258 | * @unsigned how@ = opening options (@KOPEN_*@). |
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259 | * @key_reporter *rep@ = error reporting function |
260 | * @void *arg@ = argument for function |
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261 | * |
262 | * Returns: Zero if it worked, nonzero otherwise. |
263 | * |
264 | * Use: Opens a key file, reads its contents, and stores them in a |
265 | * structure. The file is locked appropriately until closed |
266 | * using @key_close@. On an error, everything is cleared away |
267 | * tidily. If the file is opened with @KOPEN_WRITE@, it's |
268 | * created if necessary, with read and write permissions for its |
269 | * owner only. |
270 | */ |
271 | |
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272 | extern int key_open(key_file */*f*/, const char */*file*/, unsigned /*how*/, |
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273 | key_reporter */*rep*/, void */*arg*/); |
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274 | |
275 | /* --- @key_close@ --- * |
276 | * |
277 | * Arguments: @key_file *f@ = pointer to key file block |
278 | * |
279 | * Returns: A @KWRITE_@ code indicating how it went. |
280 | * |
281 | * Use: Frees all the key data, writes any changes. Make sure that |
282 | * all hell breaks loose if this returns @KWRITE_BROKEN@. |
283 | */ |
284 | |
285 | extern int key_close(key_file */*f*/); |
286 | |
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287 | /* --- @key_save@ --- * |
288 | * |
289 | * Arguments: @key_file *f@ = pointer to key file block |
290 | * |
291 | * Returns: A @KWRITE_@ code indicating how well it worked. |
292 | * |
293 | * Use: Writes a key file's data back to the actual file. This code |
294 | * is extremely careful about error handling. It should usually |
295 | * be able to back out somewhere sensible, but it can tell when |
296 | * it's got itself into a real pickle and starts leaving well |
297 | * alone. |
298 | * |
299 | * Callers, please make sure that you ring alarm bells when this |
300 | * function returns @KWRITE_BROKEN@. |
301 | */ |
302 | |
303 | extern int key_save(key_file */*f*/); |
304 | |
305 | /* --- @key_lockfile@ --- * |
306 | * |
307 | * Arguments: @key_file *f@ = pointer to file structure to initialize |
308 | * @const char *file@ = pointer to the file name |
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309 | * @unsigned how@ = opening options (@KOPEN_*@). |
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310 | * |
311 | * Returns: Zero if it worked, nonzero otherwise. |
312 | * |
313 | * Use: Opens a keyfile and stores the information needed for |
314 | * continued access in the structure. |
315 | * |
316 | * If the file is opened with @KOPEN_WRITE@, it's created if |
317 | * necessary with read and write permissions for owner only, and |
318 | * locked for update while it's open. |
319 | * |
320 | * This is a system-dependent routine, and only really intended |
321 | * for the private use of @key_open@. |
322 | */ |
323 | |
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324 | extern int key_lockfile(key_file */*f*/, const char */*file*/, |
325 | unsigned /*how*/); |
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326 | |
327 | /*----- Creating and manipulating keys ------------------------------------*/ |
328 | |
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329 | /* --- @key_new@ --- |
330 | * |
331 | * Arguments: @key_file *f@ = pointer to key file |
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332 | * @uint32 id@ = keyid to set |
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333 | * @const char *type@ = the type of this key |
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334 | * @time_t exp@ = when the key expires |
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335 | * @int *err@ = where to store the error condition |
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336 | * |
337 | * Returns: Key block containing new data, or null if it couldn't be |
338 | * done. |
339 | * |
340 | * Use: Attaches a new key to a key file. You must have a writable |
341 | * key file for this to work. |
342 | * |
343 | * The type is a key type string. This interface doesn't care |
344 | * about how type strings are formatted: it just treats them as |
345 | * opaque gobs of text. Clients are advised to choose some |
346 | * standard for representing key types, though. |
347 | * |
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348 | * The expiry time should either be a time in the future, or the |
349 | * magic value @KEXP_FOREVER@ which means `never expire this |
350 | * key'. Be careful with `forever' keys. If I were you, I'd |
351 | * use a more sophisticated key management system than this for |
352 | * them. |
353 | * |
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354 | * You have to set the actual key yourself. |
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355 | */ |
356 | |
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357 | extern key *key_new(key_file */*f*/, uint32 /*id*/, const char */*type*/, |
358 | time_t /*exp*/, int */*err*/); |
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359 | |
360 | /* --- @key_delete@ --- * |
361 | * |
362 | * Arguments: @key_file *f@ = pointer to file block |
363 | * @key *k@ = key to delete |
364 | * |
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365 | * Returns: Error code (one of the @KERR@ constants). |
d03ab969 |
366 | * |
367 | * Use: Removes the given key from the list. The key file must be |
368 | * writable. (Due to the horridness of the data structures, |
369 | * deleted keys aren't actually removed, just marked so that |
370 | * they can't be looked up or iterated over. One upshot of |
371 | * this is that they don't get written back to the file when |
372 | * it's closed.) |
373 | */ |
374 | |
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375 | extern int key_delete(key_file */*f*/, key */*k*/); |
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376 | |
377 | /* --- @key_expire@ --- * |
378 | * |
379 | * Arguments: @key_file *f@ = pointer to file block |
380 | * @key *k@ = pointer to key block |
381 | * |
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382 | * Returns: Error code (one of the @KERR@ constants). |
d03ab969 |
383 | * |
384 | * Use: Immediately marks the key as expired. It may be removed |
385 | * immediately, if it is no longer required, and will be removed |
386 | * by a tidy operation when it is no longer required. The key |
387 | * file must be writable. |
388 | */ |
389 | |
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390 | extern int key_expire(key_file */*f*/, key */*k*/); |
d03ab969 |
391 | |
392 | /* --- @key_used@ --- * |
393 | * |
394 | * Arguments: @key_file *f@ = pointer to key file |
395 | * @key *k@ = pointer to key block |
396 | * @time_t t@ = when key can be removed |
397 | * |
398 | * Returns: Zero if OK, nonzero on failure. |
399 | * |
400 | * Use: Marks a key as being required until a given time. Even |
401 | * though the key may expire before then (and won't be returned |
402 | * by type after that time), it will still be available when |
403 | * requested explicitly by id. The key file must be writable. |
404 | * |
405 | * The only (current) reason for failure is attempting to use |
406 | * a key which can expire for something which can't. |
407 | */ |
408 | |
409 | extern int key_used(key_file */*f*/, key */*k*/, time_t /*t*/); |
410 | |
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411 | /*----- Setting and reading attributes ------------------------------------*/ |
412 | |
413 | /* --- @key_chkident@ --- * |
414 | * |
415 | * Arguments: @const char *p@ = pointer to a type string |
416 | * |
417 | * Returns: Zero if OK, -1 on error. |
418 | * |
419 | * Use: Checks whether an identification component string is OK. |
420 | */ |
421 | |
422 | extern int key_chkident(const char */*p*/); |
423 | |
424 | /* --- @key_chkcomment@ --- * |
425 | * |
426 | * Arguments: @const char *p@ = pointer to a comment string |
427 | * |
428 | * Returns: Zero if OK, -1 on error. |
429 | * |
430 | * Use: Checks whether a comment string is OK. |
431 | */ |
432 | |
433 | extern int key_chkcomment(const char */*p*/); |
434 | |
435 | /* --- @key_setcomment@ --- * |
436 | * |
437 | * Arguments: @key_file *f@ = pointer to key file block |
438 | * @key *k@ = pointer to key block |
439 | * @const char *c@ = pointer to comment to set, or zero |
440 | * |
441 | * Returns: Error code (one of the @KERR@ constants). |
442 | * |
443 | * Use: Replaces the key's current comment with a new one. |
444 | */ |
445 | |
446 | extern int key_setcomment(key_file */*f*/, key */*k*/, const char */*c*/); |
447 | |
448 | /* --- @key_settag@ --- * |
449 | * |
450 | * Arguments: @key_file *f@ = pointer to key file block |
451 | * @key *k@ = pointer to key block |
452 | * @const char *tag@ = pointer to comment to set, or zero |
453 | * |
454 | * Returns: Error code (one of the @KERR@ constants). |
455 | * |
456 | * Use: Replaces the key's current tag with a new one. |
457 | */ |
458 | |
459 | extern int key_settag(key_file */*f*/, key */*k*/, const char */*tag*/); |
460 | |
461 | /* --- @key_fulltag@ --- * |
462 | * |
463 | * Arguments: @key *k@ = pointer to key |
464 | * @dstr *d@ = pointer to destination string |
465 | * |
466 | * Returns: --- |
467 | * |
468 | * Use: Emits the key's full tag, which has the form |
469 | * `ID:TYPE[:TAG]'. This is used in the textual file format, |
470 | * and to identify passphrases for locked keys. |
471 | */ |
472 | |
473 | extern void key_fulltag(key */*k*/, dstr */*d*/); |
474 | |
475 | /* --- @key_qtag@ --- * |
476 | * |
477 | * Arguments: @key_file *f@ = key file to find a key from |
478 | * @const char *tag@ = pointer to tag string |
479 | * @dstr *d@ = pointer to string for full tag name |
480 | * @key **k@ = where to store the key pointer |
481 | * @key_data **kd@ = where to store the key data pointer |
482 | * |
483 | * Returns: Zero if OK, nonzero if it failed. |
484 | * |
485 | * Use: Performs a full lookup on a qualified tag name. The tag is |
486 | * qualified by the names of subkeys, separated by dots. Hence, |
487 | * a qualified tag is ID|TAG[.TAG...]. The various result |
488 | * pointers can be null to indicate that the result isn't |
489 | * interesting. |
490 | */ |
491 | |
492 | extern int key_qtag(key_file */*f*/, const char */*tag*/, |
493 | dstr */*d*/, key **/*k*/, key_data **/*kd*/); |
494 | |
495 | /* --- @key_getattr@ --- * |
496 | * |
497 | * Arguments: @key_file *f@ = pointer to file |
498 | * @key *k@ = pointer to key |
499 | * @const char *n@ = pointer to attribute name |
500 | * |
501 | * Returns: Pointer to attribute value, or null if not found. |
502 | * |
503 | * Use: Returns the value of a key attribute. |
504 | */ |
505 | |
506 | extern const char *key_getattr(key_file */*f*/, key */*k*/, |
507 | const char */*n*/); |
508 | |
509 | /* --- @key_putattr@ --- * |
510 | * |
511 | * Arguments: @key_file *f@ = pointer to file |
512 | * @key *k@ = pointer to key |
513 | * @const char *n@ = pointer to attribute name |
514 | * @const char *v@ = pointer to attribute value or null |
515 | * |
516 | * Returns: Error code (one of the @KERR@ constants). |
517 | * |
518 | * Use: Inserts an attribute on a key. If an attribute with the same |
519 | * name already exists, it is deleted. Setting a null value |
520 | * removes the attribute. |
521 | */ |
522 | |
523 | extern int key_putattr(key_file */*f*/, key */*k*/, |
524 | const char */*n*/, const char */*v*/); |
525 | |
526 | /* --- @key_mkattriter@ --- * |
527 | * |
528 | * Arguments: @key_attriter *i@ = pointer to attribute iterator |
529 | * @key *k@ = pointer to key |
530 | * |
531 | * Returns: --- |
532 | * |
533 | * Use: Initializes an attribute iterator. The attributes are |
534 | * returned by @key_nextattr@. |
535 | */ |
536 | |
537 | extern void key_mkattriter(key_attriter */*i*/, key */*k*/); |
538 | |
539 | /* --- @key_nextattr@ --- * |
540 | * |
541 | * Arguments: @key_attriter *i@ = pointer to attribute iterator |
542 | * @const char **n, **v@ = pointers to name and value |
543 | * |
544 | * Returns: Zero if no attribute available, or nonzero if returned OK. |
545 | * |
546 | * Use: Returns the next attribute. |
547 | */ |
548 | |
549 | extern int key_nextattr(key_attriter */*i*/, |
550 | const char **/*n*/, const char **/*v*/); |
551 | |
552 | /*----- Searching and iterating -------------------------------------------*/ |
553 | |
554 | /* --- @key_bytype@ --- * |
555 | * |
556 | * Arguments: @key_file *f@ = key file we want a key from |
557 | * @const char *type@ = type string for desired key |
558 | * |
559 | * Returns: Pointer to the best key to use, or null. |
560 | * |
561 | * Use: Looks up a key by its type. Returns the key with the latest |
562 | * expiry time. This function will not return an expired key. |
563 | */ |
564 | |
565 | extern key *key_bytype(key_file */*f*/, const char */*type*/); |
566 | |
567 | /* --- @key_byid@ --- * |
568 | * |
569 | * Arguments: @key_file *f@ = key file to find a key from |
570 | * @uint32 id@ = id to look for |
571 | * |
572 | * Returns: Key with matching id. |
573 | * |
574 | * Use: Returns a key given its id. This function will return an |
575 | * expired key, but not a deleted one. |
576 | */ |
577 | |
578 | extern key *key_byid(key_file */*f*/, uint32 /*id*/); |
579 | |
580 | /* --- @key_bytag@ --- * |
581 | * |
582 | * Arguments: @key_file *f@ = key file to find a key from |
583 | * @const char *tag@ = pointer to tag string |
584 | * |
585 | * Returns: Key with matching id or tag. |
586 | * |
587 | * Use: Returns a key given its tag or id. This function will return |
588 | * an expired key, but not a deleted one. |
589 | */ |
590 | |
591 | extern key *key_bytag(key_file */*f*/, const char */*tag*/); |
592 | |
593 | /* --- @key_mkiter@ --- * |
594 | * |
595 | * Arguments: @key_iter *i@ = pointer to iterator object |
596 | * @key_file *f@ = pointer to file structure |
597 | * |
598 | * Returns: --- |
599 | * |
600 | * Use: Initializes a key iterator. The keys are returned by |
601 | * @key_next@. |
602 | */ |
603 | |
604 | extern void key_mkiter(key_iter */*i*/, key_file */*f*/); |
605 | |
606 | /* --- @key_next@ --- * |
607 | * |
608 | * Arguments: @key_iter *i@ = pointer to iterator object |
609 | * |
610 | * Returns: Pointer to next key, or null. |
611 | * |
612 | * Use: Returns the next key in some arbitrary sequence. |
613 | */ |
614 | |
615 | extern key *key_next(key_iter */*i*/); |
616 | |
cae5cb8e |
617 | /*----- Fetching key data conveniently ------------------------------------*/ |
618 | |
619 | /* --- @key_fetchinit@ --- * |
620 | * |
621 | * Arguments: @const key_fetchdef *kf@ = pointer to base definition |
622 | * @key_packstruct *kps@ = pointer to destination packing def |
623 | * @void *p@ = pointer to destination block |
624 | * |
625 | * Returns: Pointer to packing definition. |
626 | * |
627 | * Use: Initializes a packing definition (@key_packdef@ structure). |
628 | * If @kps@ is null on entry, an appropriately sized block is |
629 | * allocated automatically. Otherwise it must be large enough. |
630 | */ |
631 | |
632 | extern key_packdef *key_fetchinit(const key_fetchdef */*kf*/, |
633 | key_packstruct */*kp*/, void */*p*/); |
634 | |
635 | /* --- @key_fetch@ --- * |
636 | * |
637 | * Arguments: @key_packdef *kp@ = pointer to packing structure |
638 | * @key *k@ = key file containing desired key |
639 | * |
640 | * Returns: Error code, or zero. |
641 | * |
642 | * Use: Fetches an unpacked key from a packed one. |
643 | */ |
644 | |
645 | extern int key_fetch(key_packdef */*kp*/, key */*k*/); |
646 | |
647 | /* --- @key_fetchbyname@ --- * |
648 | * |
649 | * Arguments: @key_packdef *kp@ = pointer to packing structure |
650 | * @key_file *kf@ = key file containing desired key |
651 | * @const char *tag@ = user's tag describing the key |
652 | * |
653 | * Returns: Error code, or zero. |
654 | * |
655 | * Use: Fetches a named key from a key file and unpacks it |
656 | * conveniently. |
657 | */ |
658 | |
659 | extern int key_fetchbyname(key_packdef */*kp*/, |
660 | key_file */*kf*/, const char */*tag*/); |
661 | |
662 | /* --- @key_fetchdone@ --- * |
663 | * |
664 | * Arguments: @key_packdef *kp@ = pointer to packing structure |
665 | * |
666 | * Returns: --- |
667 | * |
668 | * Use: Frees a packing structure. If the structure was allocated by |
669 | * @key_fetchinit@ then it is freed. |
670 | */ |
671 | |
672 | extern void key_fetchdone(key_packdef */*kp*/); |
673 | |
d11a0bf7 |
674 | /*----- Other functions ---------------------------------------------------*/ |
675 | |
676 | /* --- @key_moan@ --- * |
677 | * |
678 | * Arguments: @const char *file@ = name of the file |
679 | * @int line@ = line number in file |
680 | * @const char *msg@ = error message |
681 | * @void *p@ = argument pointer |
682 | * |
683 | * Returns: --- |
684 | * |
685 | * Use: Reports an error message about loading a key file. |
686 | */ |
687 | |
688 | extern void key_moan(const char */*file*/, int /*line*/, |
689 | const char */*msg*/, void */*p*/); |
690 | |
691 | /* --- @key_strerror@ --- * |
692 | * |
693 | * Arguments: @int err@ = error code from @key_new@ |
694 | * |
695 | * Returns: Pointer to error string. |
696 | * |
697 | * Use: Translates a @KERR@ error code into a human-readable string. |
698 | */ |
699 | |
700 | extern const char *key_strerror(int /*err*/); |
701 | |
d03ab969 |
702 | /*----- That's all, folks -------------------------------------------------*/ |
703 | |
704 | #ifdef __cplusplus |
705 | } |
706 | #endif |
707 | |
708 | #endif |