Commit | Line | Data |
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410c8acf | 1 | /* -*-c-*- |
410c8acf | 2 | * |
3 | * Main header file for TrIPE | |
4 | * | |
5 | * (c) 2001 Straylight/Edgeware | |
6 | */ | |
7 | ||
e04c2d50 | 8 | /*----- Licensing notice --------------------------------------------------* |
410c8acf | 9 | * |
10 | * This file is part of Trivial IP Encryption (TrIPE). | |
11 | * | |
12 | * TrIPE is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License as published by | |
14 | * the Free Software Foundation; either version 2 of the License, or | |
15 | * (at your option) any later version. | |
e04c2d50 | 16 | * |
410c8acf | 17 | * TrIPE is distributed in the hope that it will be useful, |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | * GNU General Public License for more details. | |
e04c2d50 | 21 | * |
410c8acf | 22 | * You should have received a copy of the GNU General Public License |
23 | * along with TrIPE; if not, write to the Free Software Foundation, | |
24 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
25 | */ | |
26 | ||
410c8acf | 27 | #ifndef TRIPE_H |
28 | #define TRIPE_H | |
29 | ||
30 | #ifdef __cplusplus | |
31 | extern "C" { | |
32 | #endif | |
33 | ||
34 | /*----- Header files ------------------------------------------------------*/ | |
35 | ||
73189848 | 36 | #include "config.h" |
37 | ||
410c8acf | 38 | #include <assert.h> |
39 | #include <ctype.h> | |
40 | #include <errno.h> | |
b9066fbb | 41 | #include <limits.h> |
410c8acf | 42 | #include <signal.h> |
43 | #include <stdarg.h> | |
44 | #include <stddef.h> | |
45 | #include <stdio.h> | |
46 | #include <stdlib.h> | |
47 | #include <string.h> | |
48 | #include <time.h> | |
49 | ||
50 | #include <sys/types.h> | |
51 | #include <sys/time.h> | |
52 | #include <unistd.h> | |
53 | #include <fcntl.h> | |
54 | #include <sys/stat.h> | |
388e0319 | 55 | #include <sys/wait.h> |
410c8acf | 56 | |
57 | #include <sys/socket.h> | |
58 | #include <sys/un.h> | |
59 | #include <netinet/in.h> | |
60 | #include <arpa/inet.h> | |
61 | #include <netdb.h> | |
62 | ||
63 | #include <pwd.h> | |
64 | #include <grp.h> | |
65 | ||
66 | #include <mLib/alloc.h> | |
67 | #include <mLib/arena.h> | |
37941236 | 68 | #include <mLib/base64.h> |
410c8acf | 69 | #include <mLib/bres.h> |
19dd2531 | 70 | #include <mLib/daemonize.h> |
410c8acf | 71 | #include <mLib/dstr.h> |
72 | #include <mLib/env.h> | |
73 | #include <mLib/fdflags.h> | |
388e0319 | 74 | #include <mLib/fdpass.h> |
410c8acf | 75 | #include <mLib/fwatch.h> |
c8e02c8a | 76 | #include <mLib/hash.h> |
165efde7 | 77 | #include <mLib/macros.h> |
b9537f3b | 78 | #include <mLib/mdup.h> |
410c8acf | 79 | #include <mLib/mdwopt.h> |
80 | #include <mLib/quis.h> | |
81 | #include <mLib/report.h> | |
82 | #include <mLib/sel.h> | |
83 | #include <mLib/selbuf.h> | |
84 | #include <mLib/sig.h> | |
85 | #include <mLib/str.h> | |
86 | #include <mLib/sub.h> | |
87 | #include <mLib/trace.h> | |
0ba8de86 | 88 | #include <mLib/tv.h> |
19dd2531 | 89 | #include <mLib/versioncmp.h> |
410c8acf | 90 | |
165db1a8 | 91 | #include <catacomb/buf.h> |
04ed79b8 | 92 | #include <catacomb/ct.h> |
165db1a8 | 93 | |
410c8acf | 94 | #include <catacomb/gcipher.h> |
95 | #include <catacomb/gmac.h> | |
96 | #include <catacomb/grand.h> | |
97 | #include <catacomb/key.h> | |
98 | #include <catacomb/paranoia.h> | |
99 | ||
410c8acf | 100 | #include <catacomb/noise.h> |
101 | #include <catacomb/rand.h> | |
410c8acf | 102 | |
103 | #include <catacomb/mp.h> | |
410c8acf | 104 | #include <catacomb/mprand.h> |
105 | #include <catacomb/dh.h> | |
52c03a2a | 106 | #include <catacomb/ec.h> |
107 | #include <catacomb/ec-keys.h> | |
108 | #include <catacomb/group.h> | |
410c8acf | 109 | |
388e0319 | 110 | #include "priv.h" |
78698994 | 111 | #include "protocol.h" |
10f681b1 | 112 | #include "slip.h" |
410c8acf | 113 | #include "util.h" |
114 | ||
115 | #undef sun | |
116 | ||
117 | /*----- Magic numbers -----------------------------------------------------*/ | |
118 | ||
410c8acf | 119 | /* --- Trace flags --- */ |
120 | ||
121 | #define T_TUNNEL 1u | |
122 | #define T_PEER 2u | |
123 | #define T_PACKET 4u | |
124 | #define T_ADMIN 8u | |
125 | #define T_CRYPTO 16u | |
126 | #define T_KEYSET 32u | |
127 | #define T_KEYEXCH 64u | |
128 | #define T_KEYMGMT 128u | |
37941236 | 129 | #define T_CHAL 256u |
388e0319 | 130 | /* T_PRIVSEP in priv.h */ |
410c8acf | 131 | |
388e0319 | 132 | #define T_ALL 1023u |
410c8acf | 133 | |
134 | /* --- Units --- */ | |
135 | ||
136 | #define SEC(n) (n##u) | |
137 | #define MIN(n) (n##u * 60u) | |
a06d57a3 | 138 | #define F_2P32 (65536.0*65536.0) |
410c8acf | 139 | #define MEG(n) (n##ul * 1024ul * 1024ul) |
140 | ||
e9fac70c MW |
141 | /* --- Timing parameters --- */ |
142 | ||
143 | #define T_EXP MIN(60) /* Expiry time for a key */ | |
144 | #define T_REGEN MIN(40) /* Regeneration time for a key */ | |
145 | ||
146 | #define T_VALID SEC(20) /* Challenge validity period */ | |
a06d57a3 MW |
147 | #define T_RETRYMIN SEC(2) /* Minimum retry interval */ |
148 | #define T_RETRYMAX MIN(5) /* Maximum retry interval */ | |
149 | #define T_RETRYGROW (5.0/4.0) /* Retry interval growth factor */ | |
150 | ||
151 | #define T_WOBBLE (1.0/3.0) /* Relative timer randomness */ | |
e9fac70c | 152 | |
410c8acf | 153 | /* --- Other things --- */ |
154 | ||
155 | #define PKBUFSZ 65536 | |
156 | ||
832a2ab6 | 157 | /*----- Cipher selections -------------------------------------------------*/ |
158 | ||
a93aacce MW |
159 | typedef struct keyset keyset; |
160 | typedef struct algswitch algswitch; | |
c70a7c5c MW |
161 | typedef struct admin admin; |
162 | ||
163 | typedef struct bulkalgs { | |
164 | const struct bulkops *ops; | |
165 | } bulkalgs; | |
166 | ||
167 | typedef struct bulkctx { | |
168 | const struct bulkops *ops; | |
169 | } bulkctx; | |
170 | ||
171 | typedef struct bulkchal { | |
172 | const struct bulkops *ops; | |
173 | size_t tagsz; | |
174 | } bulkchal; | |
175 | ||
176 | struct rawkey; | |
a93aacce | 177 | |
fddd7fb7 | 178 | typedef struct bulkops { |
a93aacce | 179 | const char *name; |
c70a7c5c MW |
180 | |
181 | bulkalgs *(*getalgs)(const algswitch */*asw*/, dstr */*e*/, | |
182 | key_file */*kf*/, key */*k*/); | |
183 | /* Determine algorithms to use and return a @bulkalgs@ object | |
184 | * representing the decision. On error, write tokens to @e@ and | |
185 | * return null. | |
186 | */ | |
187 | ||
188 | T( void (*tracealgs)(const bulkalgs */*a*/); ) | |
189 | /* Write trace information about the algorithm selection. */ | |
190 | ||
191 | int (*checkalgs)(bulkalgs */*a*/, const algswitch */*asw*/, dstr */*e*/); | |
192 | /* Check that the algorithms in @a@ and @asw@ are acceptable. On | |
193 | * error, write tokens to @e@ and return @-1@; otherwise return zero. | |
194 | */ | |
195 | ||
196 | int (*samealgsp)(const bulkalgs */*a*/, const bulkalgs */*aa*/); | |
197 | /* If @a@ and @aa@ represent the same algorithm selection, return | |
198 | * nonzero; if not, return zero. | |
199 | */ | |
200 | ||
201 | void (*alginfo)(const bulkalgs */*a*/, admin */*adm*/); | |
202 | /* Report on the algorithm selection to an admin client: call | |
203 | * @a_info@ with appropriate key-value pairs. | |
204 | */ | |
205 | ||
206 | size_t (*overhead)(const bulkalgs */*a*/); | |
207 | /* Return the per-packet overhead of the bulk transform, in bytes. */ | |
208 | ||
209 | size_t (*expsz)(const bulkalgs */*a*/); | |
210 | /* Return the total size limit for the bulk transform, in bytes, | |
211 | * after which the keys must no longer be used. | |
212 | */ | |
213 | ||
214 | bulkctx *(*genkeys)(const bulkalgs */*a*/, const struct rawkey */*rk*/); | |
215 | /* Generate session keys and construct and return an appropriate | |
216 | * context for using them, by calling @ks_derive@. | |
217 | */ | |
218 | ||
219 | bulkchal *(*genchal)(const bulkalgs */*a*/); | |
220 | /* Construct and return a challenge issuing and verification | |
221 | * context with a fresh random key. | |
222 | */ | |
223 | ||
224 | void (*freealgs)(bulkalgs */*a*/); | |
225 | /* Release an algorithm selection object. (Associated bulk | |
226 | * encryption contexts and challenge contexts may still exist and | |
227 | * must remain valid.) | |
228 | */ | |
229 | ||
230 | int (*encrypt)(bulkctx */*bc*/, unsigned /*ty*/, | |
231 | buf */*b*/, buf */*bb*/, uint32 /*seq*/); | |
232 | /* Encrypt the packet in @b@, with type @ty@ (which doesn't need | |
233 | * encoding separately) and sequence number @seq@ (which must be | |
234 | * recoverable by @decrypt@), and write the result to @bb@. On | |
235 | * error, return a @KSERR_...@ code and/or break the output buffer. | |
236 | */ | |
237 | ||
238 | int (*decrypt)(bulkctx */*bc*/, unsigned /*ty*/, | |
a93aacce | 239 | buf */*b*/, buf */*bb*/, uint32 */*seq*/); |
c70a7c5c MW |
240 | /* Decrypt the packet in @b@, with type @ty@, writing the result to |
241 | * @bb@ and storing the incoming (claimed) sequence number in @seq@. | |
242 | * On error, return a @KSERR_...@ code. | |
243 | */ | |
244 | ||
245 | void (*freectx)(bulkctx */*a*/); | |
246 | /* Release a bulk encryption context and the resources it holds. */ | |
247 | ||
248 | int (*chaltag)(bulkchal */*bc*/, const void */*m*/, size_t /*msz*/, | |
249 | void */*t*/); | |
250 | /* Calculate a tag for the challenge in @m@, @msz@, and write it to | |
251 | * @t@. Return @-1@ on error, zero on success. | |
252 | */ | |
253 | ||
254 | int (*chalvrf)(bulkchal */*bc*/, const void */*m*/, size_t /*msz*/, | |
255 | const void */*t*/); | |
256 | /* Check the tag @t@ on @m@, @msz@: return zero if the tag is OK, | |
257 | * nonzero if it's bad. | |
258 | */ | |
259 | ||
260 | void (*freechal)(bulkchal */*bc*/); | |
261 | /* Release a challenge context and the resources it holds. */ | |
a93aacce | 262 | |
c70a7c5c | 263 | } bulkops; |
a93aacce MW |
264 | |
265 | struct algswitch { | |
c70a7c5c | 266 | const gchash *h; size_t hashsz; /* Hash function */ |
a93aacce | 267 | const gccipher *mgf; /* Mask-generation function */ |
c70a7c5c | 268 | bulkalgs *bulk; /* Bulk crypto algorithms */ |
a93aacce | 269 | }; |
832a2ab6 | 270 | |
799e58b9 MW |
271 | typedef struct kdata { |
272 | unsigned ref; /* Reference counter */ | |
273 | struct knode *kn; /* Pointer to cache entry */ | |
274 | char *tag; /* Full tag name of the key */ | |
275 | group *g; /* The group we work in */ | |
276 | size_t indexsz; /* Size of exponent for the group */ | |
277 | mp *kpriv; /* The private key (or null) */ | |
278 | ge *kpub; /* The public key */ | |
279 | time_t t_exp; /* Expiry time of the key */ | |
280 | algswitch algs; /* Collection of algorithms */ | |
281 | } kdata; | |
282 | ||
283 | typedef struct knode { | |
284 | sym_base _b; /* Symbol table intrusion */ | |
285 | unsigned f; /* Various flags */ | |
286 | #define KNF_BROKEN 1u /* Don't use this key any more */ | |
287 | struct keyhalf *kh; /* Pointer to the home keyhalf */ | |
288 | kdata *kd; /* Pointer to the key data */ | |
289 | } knode; | |
832a2ab6 | 290 | |
b5c45da1 | 291 | #define MAXHASHSZ 64 /* Largest possible hash size */ |
832a2ab6 | 292 | |
b5c45da1 | 293 | #define HASH_STRING(h, s) GH_HASH((h), (s), sizeof(s)) |
410c8acf | 294 | |
fddd7fb7 | 295 | extern const bulkops bulktab[]; |
a93aacce | 296 | |
aeeb5611 | 297 | /*----- Data structures ---------------------------------------------------*/ |
410c8acf | 298 | |
299 | /* --- Socket addresses --- * | |
300 | * | |
301 | * A magic union of supported socket addresses. | |
302 | */ | |
303 | ||
304 | typedef union addr { | |
305 | struct sockaddr sa; | |
306 | struct sockaddr_in sin; | |
307 | } addr; | |
308 | ||
c8e02c8a MW |
309 | /* --- Mapping keyed on addresses --- */ |
310 | ||
311 | typedef struct addrmap { | |
312 | hash_table t; | |
313 | size_t load; | |
314 | } addrmap; | |
315 | ||
316 | typedef struct addrmap_base { | |
317 | hash_base b; | |
318 | addr a; | |
319 | } addrmap_base; | |
320 | ||
37941236 | 321 | /* --- Sequence number checking --- */ |
322 | ||
323 | typedef struct seqwin { | |
324 | uint32 seq; /* First acceptable input sequence */ | |
325 | uint32 win; /* Window of acceptable numbers */ | |
326 | } seqwin; | |
327 | ||
328 | #define SEQ_WINSZ 32 /* Bits in sequence number window */ | |
329 | ||
410c8acf | 330 | /* --- A symmetric keyset --- * |
331 | * | |
332 | * A keyset contains a set of symmetric keys for encrypting and decrypting | |
333 | * packets. Keysets are stored in a list, sorted in reverse order of | |
334 | * creation, so that the most recent keyset (the one most likely to be used) | |
335 | * is first. | |
336 | * | |
337 | * Each keyset has a time limit and a data limit. The keyset is destroyed | |
338 | * when either it has existed for too long, or it has been used to encrypt | |
339 | * too much data. New key exchanges are triggered when keys are close to | |
340 | * expiry. | |
341 | */ | |
342 | ||
c70a7c5c MW |
343 | enum { DIR_IN, DIR_OUT, NDIR }; |
344 | ||
a93aacce | 345 | struct keyset { |
410c8acf | 346 | struct keyset *next; /* Next active keyset in the list */ |
832a2ab6 | 347 | unsigned ref; /* Reference count for keyset */ |
9466fafa | 348 | struct peer *p; /* Pointer to peer structure */ |
410c8acf | 349 | time_t t_exp; /* Expiry time for this keyset */ |
383a9d71 | 350 | unsigned long sz_exp, sz_regen; /* Data limits for the keyset */ |
832a2ab6 | 351 | T( unsigned seq; ) /* Sequence number for tracing */ |
352 | unsigned f; /* Various useful flags */ | |
c70a7c5c | 353 | bulkctx *bulk; /* Bulk crypto transform */ |
1484d822 | 354 | uint32 oseq; /* Outbound sequence number */ |
37941236 | 355 | seqwin iseq; /* Inbound sequence number */ |
a93aacce | 356 | }; |
410c8acf | 357 | |
832a2ab6 | 358 | #define KSF_LISTEN 1u /* Don't encrypt packets yet */ |
359 | #define KSF_LINK 2u /* Key is in a linked list */ | |
360 | ||
a50f9a0e MW |
361 | #define KSERR_REGEN -1 /* Regenerate keys */ |
362 | #define KSERR_NOKEYS -2 /* No keys left */ | |
363 | #define KSERR_DECRYPT -3 /* Unable to decrypt message */ | |
12a26b8b MW |
364 | #define KSERR_SEQ -4 /* Incorrect sequence number */ |
365 | #define KSERR_MALFORMED -5 /* Input ciphertext is broken */ | |
a50f9a0e | 366 | |
410c8acf | 367 | /* --- Key exchange --- * |
368 | * | |
369 | * TrIPE uses the Wrestlers Protocol for its key exchange. The Wrestlers | |
370 | * Protocol has a number of desirable features (e.g., perfect forward | |
371 | * secrecy, and zero-knowledge authentication) which make it attractive for | |
372 | * use in TrIPE. The Wrestlers Protocol was designed by Mark Wooding and | |
373 | * Clive Jones. | |
374 | */ | |
375 | ||
a06d57a3 MW |
376 | typedef struct retry { |
377 | double t; /* Current retry time */ | |
378 | } retry; | |
379 | ||
832a2ab6 | 380 | #define KX_NCHAL 16u |
832a2ab6 | 381 | |
382 | typedef struct kxchal { | |
383 | struct keyexch *kx; /* Pointer back to key exchange */ | |
52c03a2a | 384 | ge *c; /* Responder's challenge */ |
385 | ge *r; /* My reply to the challenge */ | |
832a2ab6 | 386 | keyset *ks; /* Pointer to temporary keyset */ |
387 | unsigned f; /* Various useful flags */ | |
388 | sel_timer t; /* Response timer for challenge */ | |
a06d57a3 | 389 | retry rs; /* Retry state */ |
b5c45da1 | 390 | octet hc[MAXHASHSZ]; /* Hash of his challenge */ |
de7bd20b | 391 | octet ck[MAXHASHSZ]; /* His magical check value */ |
b5c45da1 | 392 | octet hswrq_in[MAXHASHSZ]; /* Inbound switch request message */ |
393 | octet hswok_in[MAXHASHSZ]; /* Inbound switch confirmation */ | |
394 | octet hswrq_out[MAXHASHSZ]; /* Outbound switch request message */ | |
395 | octet hswok_out[MAXHASHSZ]; /* Outbound switch confirmation */ | |
832a2ab6 | 396 | } kxchal; |
397 | ||
410c8acf | 398 | typedef struct keyexch { |
410c8acf | 399 | struct peer *p; /* Pointer back to the peer */ |
35c8b547 MW |
400 | kdata *kpriv; /* Private key and related info */ |
401 | kdata *kpub; /* Peer's public key */ | |
832a2ab6 | 402 | keyset **ks; /* Peer's list of keysets */ |
410c8acf | 403 | unsigned f; /* Various useful flags */ |
832a2ab6 | 404 | unsigned s; /* Current state in exchange */ |
410c8acf | 405 | sel_timer t; /* Timer for next exchange */ |
a06d57a3 | 406 | retry rs; /* Retry state */ |
832a2ab6 | 407 | mp *alpha; /* My temporary secret */ |
52c03a2a | 408 | ge *c; /* My challenge */ |
409 | ge *rx; /* The expected response */ | |
832a2ab6 | 410 | unsigned nr; /* Number of extant responses */ |
410c8acf | 411 | time_t t_valid; /* When this exchange goes bad */ |
b5c45da1 | 412 | octet hc[MAXHASHSZ]; /* Hash of my challenge */ |
832a2ab6 | 413 | kxchal *r[KX_NCHAL]; /* Array of challenges */ |
410c8acf | 414 | } keyexch; |
415 | ||
416 | #define KXF_TIMER 1u /* Waiting for a timer to go off */ | |
00e64b67 | 417 | #define KXF_DEAD 2u /* The key-exchanger isn't up */ |
418 | #define KXF_PUBKEY 4u /* Key exchanger has a public key */ | |
010e6f63 | 419 | #define KXF_CORK 8u /* Don't send anything yet */ |
832a2ab6 | 420 | |
421 | enum { | |
422 | KXS_DEAD, /* Uninitialized state (magical) */ | |
423 | KXS_CHAL, /* Main answer-challenges state */ | |
424 | KXS_COMMIT, /* Committed: send switch request */ | |
425 | KXS_SWITCH /* Switched: send confirmation */ | |
426 | }; | |
410c8acf | 427 | |
428 | /* --- Tunnel structure --- * | |
429 | * | |
430 | * Used to maintain system-specific information about the tunnel interface. | |
431 | */ | |
432 | ||
42da2a58 | 433 | typedef struct tunnel tunnel; |
434 | struct peer; | |
110d564e | 435 | |
42da2a58 | 436 | typedef struct tunnel_ops { |
437 | const char *name; /* Name of this tunnel driver */ | |
388e0319 MW |
438 | unsigned flags; /* Various interesting flags */ |
439 | #define TUNF_PRIVOPEN 1u /* Need helper to open file */ | |
42da2a58 | 440 | void (*init)(void); /* Initializes the system */ |
eb5f3fea | 441 | tunnel *(*create)(struct peer */*p*/, int /*fd*/, char **/*ifn*/); |
72917fe7 MW |
442 | /* Initializes a new tunnel */ |
443 | void (*setifname)(tunnel */*t*/, const char */*ifn*/); | |
444 | /* Notifies ifname change */ | |
42da2a58 | 445 | void (*inject)(tunnel */*t*/, buf */*b*/); /* Sends packet through if */ |
446 | void (*destroy)(tunnel */*t*/); /* Destroys a tunnel */ | |
447 | } tunnel_ops; | |
b9066fbb | 448 | |
42da2a58 | 449 | #ifndef TUN_INTERNALS |
450 | struct tunnel { const tunnel_ops *ops; }; | |
410c8acf | 451 | #endif |
410c8acf | 452 | |
832a2ab6 | 453 | /* --- Peer statistics --- * |
454 | * | |
455 | * Contains various interesting and not-so-interesting statistics about a | |
456 | * peer. This is updated by various parts of the code. The format of the | |
457 | * structure isn't considered private, and @p_stats@ returns a pointer to the | |
458 | * statistics block for a given peer. | |
459 | */ | |
460 | ||
461 | typedef struct stats { | |
462 | unsigned long sz_in, sz_out; /* Size of all data in and out */ | |
463 | unsigned long sz_kxin, sz_kxout; /* Size of key exchange messages */ | |
464 | unsigned long sz_ipin, sz_ipout; /* Size of encapsulated IP packets */ | |
3cdc3f3a | 465 | time_t t_start, t_last, t_kx; /* Time peer created, last pk, kx */ |
832a2ab6 | 466 | unsigned long n_reject; /* Number of rejected packets */ |
467 | unsigned long n_in, n_out; /* Number of packets in and out */ | |
468 | unsigned long n_kxin, n_kxout; /* Number of key exchange packets */ | |
469 | unsigned long n_ipin, n_ipout; /* Number of encrypted packets */ | |
470 | } stats; | |
471 | ||
410c8acf | 472 | /* --- Peer structure --- * |
473 | * | |
474 | * The main structure which glues everything else together. | |
475 | */ | |
476 | ||
0ba8de86 | 477 | typedef struct peerspec { |
478 | char *name; /* Peer's name */ | |
fe2a5dcf | 479 | char *privtag; /* Private key tag */ |
48b84569 | 480 | char *tag; /* Public key tag */ |
0ba8de86 | 481 | const tunnel_ops *tops; /* Tunnel operations */ |
482 | unsigned long t_ka; /* Keep alive interval */ | |
483 | addr sa; /* Socket address to speak to */ | |
484 | size_t sasz; /* Socket address size */ | |
8743c776 | 485 | unsigned f; /* Flags for the peer */ |
6411163d MW |
486 | #define PSF_KXMASK 255u /* Key-exchange flags to set */ |
487 | #define PSF_MOBILE 256u /* Address may change rapidly */ | |
0ba8de86 | 488 | } peerspec; |
489 | ||
c8e02c8a MW |
490 | typedef struct peer_byname { |
491 | sym_base _b; | |
492 | struct peer *p; | |
493 | } peer_byname; | |
494 | ||
495 | typedef struct peer_byaddr { | |
496 | addrmap_base _b; | |
497 | struct peer *p; | |
498 | } peer_byaddr; | |
499 | ||
410c8acf | 500 | typedef struct peer { |
c8e02c8a MW |
501 | peer_byname *byname; /* Lookup-by-name block */ |
502 | peer_byaddr *byaddr; /* Lookup-by-address block */ | |
0ba8de86 | 503 | struct ping *pings; /* Pings we're waiting for */ |
504 | peerspec spec; /* Specifications for this peer */ | |
42da2a58 | 505 | tunnel *t; /* Tunnel for local packets */ |
64cf2223 | 506 | char *ifname; /* Interface name for tunnel */ |
410c8acf | 507 | keyset *ks; /* List head for keysets */ |
410c8acf | 508 | buf b; /* Buffer for sending packets */ |
832a2ab6 | 509 | stats st; /* Statistics */ |
510 | keyexch kx; /* Key exchange protocol block */ | |
0ba8de86 | 511 | sel_timer tka; /* Timer for keepalives */ |
410c8acf | 512 | } peer; |
513 | ||
c8e02c8a MW |
514 | typedef struct peer_iter { sym_iter i; } peer_iter; |
515 | ||
0ba8de86 | 516 | typedef struct ping { |
517 | struct ping *next, *prev; /* Links to next and previous */ | |
518 | peer *p; /* Peer so we can free it */ | |
519 | unsigned msg; /* Kind of response expected */ | |
520 | uint32 id; /* Id so we can recognize response */ | |
521 | octet magic[32]; /* Some random data */ | |
522 | sel_timer t; /* Timeout for ping */ | |
523 | void (*func)(int /*rc*/, void */*arg*/); /* Function to call when done */ | |
524 | void *arg; /* Argument for callback */ | |
525 | } ping; | |
526 | ||
527 | enum { | |
528 | PING_NONOTIFY = -1, | |
529 | PING_OK = 0, | |
530 | PING_TIMEOUT, | |
531 | PING_PEERDIED, | |
532 | PING_MAX | |
533 | }; | |
534 | ||
410c8acf | 535 | /* --- Admin structure --- */ |
536 | ||
fd3cf232 | 537 | #define OBUFSZ 16384u |
538 | ||
539 | typedef struct obuf { | |
540 | struct obuf *next; /* Next buffer in list */ | |
541 | char *p_in, *p_out; /* Pointers into the buffer */ | |
542 | char buf[OBUFSZ]; /* The actual buffer */ | |
543 | } obuf; | |
544 | ||
de014da6 | 545 | typedef struct oqueue { |
546 | obuf *hd, *tl; /* Head and tail pointers */ | |
547 | } oqueue; | |
548 | ||
549 | struct admin; | |
550 | ||
551 | typedef struct admin_bgop { | |
552 | struct admin_bgop *next, *prev; /* Links to next and previous */ | |
553 | struct admin *a; /* Owner job */ | |
554 | char *tag; /* Tag string for messages */ | |
555 | void (*cancel)(struct admin_bgop *); /* Destructor function */ | |
556 | } admin_bgop; | |
557 | ||
37941236 | 558 | typedef struct admin_resop { |
de014da6 | 559 | admin_bgop bg; /* Background operation header */ |
37941236 | 560 | char *addr; /* Hostname to be resolved */ |
de014da6 | 561 | bres_client r; /* Background resolver task */ |
562 | sel_timer t; /* Timer for resolver */ | |
37941236 | 563 | addr sa; /* Socket address */ |
564 | size_t sasz; /* Socket address size */ | |
565 | void (*func)(struct admin_resop *, int); /* Handler */ | |
566 | } admin_resop; | |
567 | ||
568 | enum { ARES_OK, ARES_FAIL }; | |
569 | ||
570 | typedef struct admin_addop { | |
571 | admin_resop r; /* Name resolution header */ | |
572 | peerspec peer; /* Peer pending creation */ | |
de014da6 | 573 | } admin_addop; |
574 | ||
575 | typedef struct admin_pingop { | |
576 | admin_bgop bg; /* Background operation header */ | |
577 | ping ping; /* Ping pending response */ | |
578 | struct timeval pingtime; /* Time last ping was sent */ | |
be6a1b7a MW |
579 | } admin_pingop; |
580 | ||
581 | typedef struct admin_service { | |
582 | sym_base _b; /* Hash table base structure */ | |
583 | char *version; /* The provided version */ | |
584 | struct admin *prov; /* Which client provides me */ | |
585 | struct admin_service *next, *prev; /* Client's list of services */ | |
586 | } admin_service; | |
de014da6 | 587 | |
5d46c0f8 MW |
588 | typedef struct admin_svcop { |
589 | admin_bgop bg; /* Background operation header */ | |
590 | struct admin *prov; /* Client servicing this job */ | |
cc921fba | 591 | unsigned index; /* This job's index */ |
5d46c0f8 MW |
592 | struct admin_svcop *next, *prev; /* Links for provider's jobs */ |
593 | } admin_svcop; | |
594 | ||
595 | typedef struct admin_jobentry { | |
596 | unsigned short seq; /* Zero if unused */ | |
597 | union { | |
598 | admin_svcop *op; /* Operation, if slot in use, ... */ | |
599 | uint32 next; /* ... or index of next free slot */ | |
600 | } u; | |
601 | } admin_jobentry; | |
602 | ||
603 | typedef struct admin_jobtable { | |
604 | uint32 n, sz; /* Used slots and table size */ | |
605 | admin_svcop *active; /* List of active jobs */ | |
606 | uint32 free; /* Index of first free slot */ | |
607 | admin_jobentry *v; /* And the big array of entries */ | |
608 | } admin_jobtable; | |
609 | ||
c70a7c5c | 610 | struct admin { |
410c8acf | 611 | struct admin *next, *prev; /* Links to next and previous */ |
fd3cf232 | 612 | unsigned f; /* Various useful flags */ |
060ca767 | 613 | unsigned ref; /* Reference counter */ |
410c8acf | 614 | #ifndef NTRACE |
615 | unsigned seq; /* Sequence number for tracing */ | |
616 | #endif | |
de014da6 | 617 | oqueue out; /* Output buffer list */ |
618 | oqueue delay; /* Delayed output buffer list */ | |
619 | admin_bgop *bg; /* Backgrounded operations */ | |
be6a1b7a | 620 | admin_service *svcs; /* Which services I provide */ |
5d46c0f8 | 621 | admin_jobtable j; /* Table of outstanding jobs */ |
fd3cf232 | 622 | selbuf b; /* Line buffer for commands */ |
623 | sel_file w; /* Selector for write buffering */ | |
c70a7c5c | 624 | }; |
410c8acf | 625 | |
fd3cf232 | 626 | #define AF_DEAD 1u /* Destroy this admin block */ |
060ca767 | 627 | #define AF_CLOSE 2u /* Client closed connection */ |
3cdc3f3a | 628 | #define AF_NOTE 4u /* Catch notifications */ |
de014da6 | 629 | #define AF_WARN 8u /* Catch warning messages */ |
3cdc3f3a | 630 | #ifndef NTRACE |
de014da6 | 631 | #define AF_TRACE 16u /* Catch tracing */ |
3cdc3f3a | 632 | #endif |
46dde080 | 633 | #define AF_FOREGROUND 32u /* Quit server when client closes */ |
3cdc3f3a | 634 | |
635 | #ifndef NTRACE | |
636 | # define AF_ALLMSGS (AF_NOTE | AF_TRACE | AF_WARN) | |
637 | #else | |
638 | # define AF_ALLMSGS (AF_NOTE | AF_WARN) | |
639 | #endif | |
fd3cf232 | 640 | |
410c8acf | 641 | /*----- Global variables --------------------------------------------------*/ |
642 | ||
643 | extern sel_state sel; /* Global I/O event state */ | |
a4b808b0 | 644 | extern octet buf_i[PKBUFSZ], buf_o[PKBUFSZ], buf_t[PKBUFSZ], buf_u[PKBUFSZ]; |
42da2a58 | 645 | extern const tunnel_ops *tunnels[]; /* Table of tunnels (0-term) */ |
646 | extern const tunnel_ops *tun_default; /* Default tunnel to use */ | |
799e58b9 MW |
647 | extern kdata *master; /* Default private key */ |
648 | extern const char *tag_priv; /* Default private key tag */ | |
410c8acf | 649 | |
650 | #ifndef NTRACE | |
651 | extern const trace_opt tr_opts[]; /* Trace options array */ | |
652 | extern unsigned tr_flags; /* Trace options flags */ | |
653 | #endif | |
654 | ||
8d0c7a83 | 655 | /*----- Other macros ------------------------------------------------------*/ |
656 | ||
36b9f99a MW |
657 | #define QUICKRAND \ |
658 | do { rand_quick(RAND_GLOBAL); noise_timer(RAND_GLOBAL); } while (0) | |
8d0c7a83 | 659 | |
410c8acf | 660 | /*----- Key management ----------------------------------------------------*/ |
661 | ||
799e58b9 MW |
662 | /* --- @km_init@ --- * |
663 | * | |
664 | * Arguments: @const char *privkr@ = private keyring file | |
665 | * @const char *pubkr@ = public keyring file | |
666 | * @const char *ptag@ = default private-key tag | |
667 | * | |
668 | * Returns: --- | |
669 | * | |
670 | * Use: Initializes the key-management machinery, loading the | |
671 | * keyrings and so on. | |
672 | */ | |
673 | ||
674 | extern void km_init(const char */*privkr*/, const char */*pubkr*/, | |
675 | const char */*ptag*/); | |
676 | ||
de014da6 | 677 | /* --- @km_reload@ --- * |
410c8acf | 678 | * |
679 | * Arguments: --- | |
680 | * | |
681 | * Returns: Zero if OK, nonzero to force reloading of keys. | |
682 | * | |
de014da6 | 683 | * Use: Checks the keyrings to see if they need reloading. |
410c8acf | 684 | */ |
685 | ||
de014da6 | 686 | extern int km_reload(void); |
410c8acf | 687 | |
799e58b9 MW |
688 | /* --- @km_findpub@, @km_findpriv@ --- * |
689 | * | |
690 | * Arguments: @const char *tag@ = key tag to load | |
691 | * | |
692 | * Returns: Pointer to the kdata object if successful, or null on error. | |
693 | * | |
694 | * Use: Fetches a public or private key from the keyring. | |
695 | */ | |
696 | ||
697 | extern kdata *km_findpub(const char */*tag*/); | |
698 | extern kdata *km_findpriv(const char */*tag*/); | |
699 | ||
700 | /* --- @km_samealgsp@ --- * | |
701 | * | |
702 | * Arguments: @const kdata *kdx, *kdy@ = two key data objects | |
410c8acf | 703 | * |
799e58b9 MW |
704 | * Returns: Nonzero if their two algorithm selections are the same. |
705 | * | |
706 | * Use: Checks sameness of algorithm selections: used to ensure that | |
707 | * peers are using sensible algorithms. | |
708 | */ | |
709 | ||
710 | extern int km_samealgsp(const kdata */*kdx*/, const kdata */*kdy*/); | |
711 | ||
712 | /* --- @km_ref@ --- * | |
410c8acf | 713 | * |
799e58b9 | 714 | * Arguments: @kdata *kd@ = pointer to the kdata object |
410c8acf | 715 | * |
716 | * Returns: --- | |
717 | * | |
799e58b9 | 718 | * Use: Claim a new reference to a kdata object. |
410c8acf | 719 | */ |
720 | ||
799e58b9 | 721 | extern void km_ref(kdata */*kd*/); |
410c8acf | 722 | |
799e58b9 | 723 | /* --- @km_unref@ --- * |
410c8acf | 724 | * |
799e58b9 | 725 | * Arguments: @kdata *kd@ = pointer to the kdata object |
410c8acf | 726 | * |
799e58b9 | 727 | * Returns: --- |
410c8acf | 728 | * |
799e58b9 | 729 | * Use: Releases a reference to a kdata object. |
410c8acf | 730 | */ |
731 | ||
799e58b9 MW |
732 | extern void km_unref(kdata */*kd*/); |
733 | ||
734 | /* --- @km_tag@ --- * | |
735 | * | |
736 | * Arguments: @kdata *kd@ - pointer to the kdata object | |
737 | * | |
738 | * Returns: A pointer to the short tag by which the kdata was loaded. | |
410c8acf | 739 | */ |
740 | ||
799e58b9 | 741 | extern const char *km_tag(kdata */*kd*/); |
410c8acf | 742 | |
743 | /*----- Key exchange ------------------------------------------------------*/ | |
744 | ||
745 | /* --- @kx_start@ --- * | |
746 | * | |
747 | * Arguments: @keyexch *kx@ = pointer to key exchange context | |
de014da6 | 748 | * @int forcep@ = nonzero to ignore the quiet timer |
410c8acf | 749 | * |
750 | * Returns: --- | |
751 | * | |
752 | * Use: Stimulates a key exchange. If a key exchage is in progress, | |
753 | * a new challenge is sent (unless the quiet timer forbids | |
754 | * this); if no exchange is in progress, one is commenced. | |
755 | */ | |
756 | ||
de014da6 | 757 | extern void kx_start(keyexch */*kx*/, int /*forcep*/); |
410c8acf | 758 | |
832a2ab6 | 759 | /* --- @kx_message@ --- * |
410c8acf | 760 | * |
761 | * Arguments: @keyexch *kx@ = pointer to key exchange context | |
832a2ab6 | 762 | * @unsigned msg@ = the message code |
763 | * @buf *b@ = pointer to buffer containing the packet | |
410c8acf | 764 | * |
765 | * Returns: --- | |
766 | * | |
832a2ab6 | 767 | * Use: Reads a packet containing key exchange messages and handles |
768 | * it. | |
410c8acf | 769 | */ |
770 | ||
832a2ab6 | 771 | extern void kx_message(keyexch */*kx*/, unsigned /*msg*/, buf */*b*/); |
410c8acf | 772 | |
773 | /* --- @kx_free@ --- * | |
774 | * | |
775 | * Arguments: @keyexch *kx@ = pointer to key exchange context | |
776 | * | |
777 | * Returns: --- | |
778 | * | |
779 | * Use: Frees everything in a key exchange context. | |
780 | */ | |
781 | ||
782 | extern void kx_free(keyexch */*kx*/); | |
783 | ||
784 | /* --- @kx_newkeys@ --- * | |
785 | * | |
786 | * Arguments: @keyexch *kx@ = pointer to key exchange context | |
787 | * | |
788 | * Returns: --- | |
789 | * | |
790 | * Use: Informs the key exchange module that its keys may have | |
791 | * changed. If fetching the new keys fails, the peer will be | |
792 | * destroyed, we log messages and struggle along with the old | |
793 | * keys. | |
794 | */ | |
795 | ||
796 | extern void kx_newkeys(keyexch */*kx*/); | |
797 | ||
798 | /* --- @kx_init@ --- * | |
799 | * | |
800 | * Arguments: @keyexch *kx@ = pointer to key exchange context | |
801 | * @peer *p@ = pointer to peer context | |
802 | * @keyset **ks@ = pointer to keyset list | |
010e6f63 | 803 | * @unsigned f@ = various useful flags |
410c8acf | 804 | * |
805 | * Returns: Zero if OK, nonzero if it failed. | |
806 | * | |
807 | * Use: Initializes a key exchange module. The module currently | |
808 | * contains no keys, and will attempt to initiate a key | |
809 | * exchange. | |
810 | */ | |
811 | ||
010e6f63 MW |
812 | extern int kx_init(keyexch */*kx*/, peer */*p*/, |
813 | keyset **/*ks*/, unsigned /*f*/); | |
410c8acf | 814 | |
815 | /*----- Keysets and symmetric cryptography --------------------------------*/ | |
816 | ||
832a2ab6 | 817 | /* --- @ks_drop@ --- * |
818 | * | |
819 | * Arguments: @keyset *ks@ = pointer to a keyset | |
820 | * | |
821 | * Returns: --- | |
822 | * | |
823 | * Use: Decrements a keyset's reference counter. If the counter hits | |
824 | * zero, the keyset is freed. | |
825 | */ | |
826 | ||
827 | extern void ks_drop(keyset */*ks*/); | |
828 | ||
c70a7c5c MW |
829 | /* --- @ks_derivekey@ --- * |
830 | * | |
831 | * Arguments: @octet *k@ = pointer to an output buffer of at least | |
832 | * @MAXHASHSZ@ bytes | |
833 | * @size_t ksz@ = actual size wanted (for tracing) | |
834 | * @const struct rawkey *rk@ = a raw key, as passed into | |
835 | * @genkeys@ | |
836 | * @int dir@ = direction for the key (@DIR_IN@ or @DIR_OUT@) | |
837 | * @const char *what@ = label for the key (input to derivation) | |
838 | * | |
839 | * Returns: --- | |
840 | * | |
841 | * Use: Derives a session key, for use on incoming or outgoing data. | |
842 | * This function is part of a private protocol between @ks_gen@ | |
843 | * and the bulk crypto transform @genkeys@ operation. | |
844 | */ | |
845 | ||
846 | extern void ks_derivekey(octet */*k*/, size_t /*ksz*/, | |
847 | const struct rawkey */*rk*/, | |
848 | int /*dir*/, const char */*what*/); | |
849 | ||
832a2ab6 | 850 | /* --- @ks_gen@ --- * |
851 | * | |
852 | * Arguments: @const void *k@ = pointer to key material | |
853 | * @size_t x, y, z@ = offsets into key material (see below) | |
9466fafa | 854 | * @peer *p@ = pointer to peer information |
832a2ab6 | 855 | * |
856 | * Returns: A pointer to the new keyset. | |
857 | * | |
858 | * Use: Derives a new keyset from the given key material. The | |
859 | * offsets @x@, @y@ and @z@ separate the key material into three | |
860 | * parts. Between the @k@ and @k + x@ is `my' contribution to | |
861 | * the key material; between @k + x@ and @k + y@ is `your' | |
862 | * contribution; and between @k + y@ and @k + z@ is a shared | |
863 | * value we made together. These are used to construct two | |
864 | * pairs of symmetric keys. Each pair consists of an encryption | |
865 | * key and a message authentication key. One pair is used for | |
866 | * outgoing messages, the other for incoming messages. | |
867 | * | |
868 | * The new key is marked so that it won't be selected for output | |
869 | * by @ksl_encrypt@. You can still encrypt data with it by | |
870 | * calling @ks_encrypt@ directly. | |
871 | */ | |
872 | ||
873 | extern keyset *ks_gen(const void */*k*/, | |
9466fafa | 874 | size_t /*x*/, size_t /*y*/, size_t /*z*/, |
875 | peer */*p*/); | |
832a2ab6 | 876 | |
832a2ab6 | 877 | /* --- @ks_activate@ --- * |
878 | * | |
879 | * Arguments: @keyset *ks@ = pointer to a keyset | |
880 | * | |
881 | * Returns: --- | |
882 | * | |
883 | * Use: Activates a keyset, so that it can be used for encrypting | |
884 | * outgoing messages. | |
885 | */ | |
886 | ||
887 | extern void ks_activate(keyset */*ks*/); | |
888 | ||
889 | /* --- @ks_encrypt@ --- * | |
890 | * | |
891 | * Arguments: @keyset *ks@ = pointer to a keyset | |
7ed14135 | 892 | * @unsigned ty@ = message type |
832a2ab6 | 893 | * @buf *b@ = pointer to input buffer |
894 | * @buf *bb@ = pointer to output buffer | |
895 | * | |
a50f9a0e MW |
896 | * Returns: Zero if successful; @KSERR_REGEN@ if we should negotiate a |
897 | * new key; @KSERR_NOKEYS@ if the key is not usable. Also | |
898 | * returns zero if there was insufficient buffer (but the output | |
899 | * buffer is broken in this case). | |
832a2ab6 | 900 | * |
901 | * Use: Encrypts a block of data using the key. Note that the `key | |
902 | * ought to be replaced' notification is only ever given once | |
903 | * for each key. Also note that this call forces a keyset to be | |
904 | * used even if it's marked as not for data output. | |
a93aacce MW |
905 | * |
906 | * The encryption transform is permitted to corrupt @buf_u@ for | |
907 | * its own purposes. Neither the source nor destination should | |
908 | * be within @buf_u@; and callers mustn't expect anything stored | |
909 | * in @buf_u@ to still | |
832a2ab6 | 910 | */ |
911 | ||
7ed14135 | 912 | extern int ks_encrypt(keyset */*ks*/, unsigned /*ty*/, |
913 | buf */*b*/, buf */*bb*/); | |
832a2ab6 | 914 | |
915 | /* --- @ks_decrypt@ --- * | |
916 | * | |
917 | * Arguments: @keyset *ks@ = pointer to a keyset | |
7ed14135 | 918 | * @unsigned ty@ = expected type code |
832a2ab6 | 919 | * @buf *b@ = pointer to an input buffer |
920 | * @buf *bb@ = pointer to an output buffer | |
921 | * | |
a50f9a0e MW |
922 | * Returns: Zero on success; @KSERR_DECRYPT@ on failure. Also returns |
923 | * zero if there was insufficient buffer (but the output buffer | |
924 | * is broken in this case). | |
832a2ab6 | 925 | * |
926 | * Use: Attempts to decrypt a message using a given key. Note that | |
927 | * requesting decryption with a key directly won't clear a | |
928 | * marking that it's not for encryption. | |
a93aacce MW |
929 | * |
930 | * The decryption transform is permitted to corrupt @buf_u@ for | |
931 | * its own purposes. Neither the source nor destination should | |
932 | * be within @buf_u@; and callers mustn't expect anything stored | |
933 | * in @buf_u@ to still | |
832a2ab6 | 934 | */ |
935 | ||
7ed14135 | 936 | extern int ks_decrypt(keyset */*ks*/, unsigned /*ty*/, |
937 | buf */*b*/, buf */*bb*/); | |
832a2ab6 | 938 | |
939 | /* --- @ksl_free@ --- * | |
410c8acf | 940 | * |
941 | * Arguments: @keyset **ksroot@ = pointer to keyset list head | |
942 | * | |
943 | * Returns: --- | |
944 | * | |
832a2ab6 | 945 | * Use: Frees (releases references to) all of the keys in a keyset. |
410c8acf | 946 | */ |
947 | ||
832a2ab6 | 948 | extern void ksl_free(keyset **/*ksroot*/); |
410c8acf | 949 | |
832a2ab6 | 950 | /* --- @ksl_link@ --- * |
410c8acf | 951 | * |
952 | * Arguments: @keyset **ksroot@ = pointer to keyset list head | |
832a2ab6 | 953 | * @keyset *ks@ = pointer to a keyset |
410c8acf | 954 | * |
955 | * Returns: --- | |
956 | * | |
832a2ab6 | 957 | * Use: Links a keyset into a list. A keyset can only be on one list |
958 | * at a time. Bad things happen otherwise. | |
410c8acf | 959 | */ |
960 | ||
832a2ab6 | 961 | extern void ksl_link(keyset **/*ksroot*/, keyset */*ks*/); |
410c8acf | 962 | |
832a2ab6 | 963 | /* --- @ksl_prune@ --- * |
410c8acf | 964 | * |
965 | * Arguments: @keyset **ksroot@ = pointer to keyset list head | |
410c8acf | 966 | * |
832a2ab6 | 967 | * Returns: --- |
410c8acf | 968 | * |
832a2ab6 | 969 | * Use: Prunes the keyset list by removing keys which mustn't be used |
970 | * any more. | |
410c8acf | 971 | */ |
972 | ||
832a2ab6 | 973 | extern void ksl_prune(keyset **/*ksroot*/); |
410c8acf | 974 | |
832a2ab6 | 975 | /* --- @ksl_encrypt@ --- * |
410c8acf | 976 | * |
977 | * Arguments: @keyset **ksroot@ = pointer to keyset list head | |
7ed14135 | 978 | * @unsigned ty@ = message type |
410c8acf | 979 | * @buf *b@ = pointer to input buffer |
980 | * @buf *bb@ = pointer to output buffer | |
981 | * | |
a50f9a0e MW |
982 | * Returns: Zero if successful; @KSERR_REGEN@ if it's time to negotiate a |
983 | * new key; @KSERR_NOKEYS@ if there are no suitable keys | |
984 | * available. Also returns zero if there was insufficient | |
985 | * buffer space (but the output buffer is broken in this case). | |
410c8acf | 986 | * |
987 | * Use: Encrypts a packet. | |
988 | */ | |
989 | ||
7ed14135 | 990 | extern int ksl_encrypt(keyset **/*ksroot*/, unsigned /*ty*/, |
991 | buf */*b*/, buf */*bb*/); | |
410c8acf | 992 | |
832a2ab6 | 993 | /* --- @ksl_decrypt@ --- * |
410c8acf | 994 | * |
995 | * Arguments: @keyset **ksroot@ = pointer to keyset list head | |
7ed14135 | 996 | * @unsigned ty@ = expected type code |
410c8acf | 997 | * @buf *b@ = pointer to input buffer |
998 | * @buf *bb@ = pointer to output buffer | |
999 | * | |
a50f9a0e MW |
1000 | * Returns: Zero on success; @KSERR_DECRYPT@ on failure. Also returns |
1001 | * zero if there was insufficient buffer (but the output buffer | |
1002 | * is broken in this case). | |
410c8acf | 1003 | * |
1004 | * Use: Decrypts a packet. | |
1005 | */ | |
1006 | ||
7ed14135 | 1007 | extern int ksl_decrypt(keyset **/*ksroot*/, unsigned /*ty*/, |
1008 | buf */*b*/, buf */*bb*/); | |
410c8acf | 1009 | |
37941236 | 1010 | /*----- Challenges --------------------------------------------------------*/ |
1011 | ||
1012 | /* --- @c_new@ --- * | |
1013 | * | |
1014 | * Arguments: @buf *b@ = where to put the challenge | |
1015 | * | |
1016 | * Returns: Zero if OK, nonzero on error. | |
1017 | * | |
1018 | * Use: Issues a new challenge. | |
1019 | */ | |
1020 | ||
1021 | extern int c_new(buf */*b*/); | |
1022 | ||
1023 | /* --- @c_check@ --- * | |
1024 | * | |
1025 | * Arguments: @buf *b@ = where to find the challenge | |
1026 | * | |
1027 | * Returns: Zero if OK, nonzero if it didn't work. | |
1028 | * | |
1029 | * Use: Checks a challenge. On failure, the buffer is broken. | |
1030 | */ | |
1031 | ||
1032 | extern int c_check(buf */*b*/); | |
1033 | ||
410c8acf | 1034 | /*----- Administration interface ------------------------------------------*/ |
1035 | ||
f43df819 MW |
1036 | #define A_END ((char *)0) |
1037 | ||
7f73baaf MW |
1038 | /* --- @a_vformat@ --- * |
1039 | * | |
1040 | * Arguments: @dstr *d@ = where to leave the formatted message | |
1041 | * @const char *fmt@ = pointer to format string | |
b730d38c | 1042 | * @va_list *ap@ = arguments in list |
7f73baaf MW |
1043 | * |
1044 | * Returns: --- | |
1045 | * | |
1046 | * Use: Main message token formatting driver. The arguments are | |
1047 | * interleaved formatting tokens and their parameters, finally | |
1048 | * terminated by an entry @A_END@. | |
1049 | * | |
1050 | * Tokens recognized: | |
1051 | * | |
1052 | * * "*..." ... -- pretokenized @dstr_putf@-like string | |
1053 | * | |
1054 | * * "?ADDR" SOCKADDR -- a socket address, to be converted | |
1055 | * | |
1056 | * * "?B64" BUFFER SIZE -- binary data to be base64-encoded | |
1057 | * | |
1058 | * * "?TOKENS" VECTOR -- null-terminated vector of tokens | |
1059 | * | |
1060 | * * "?PEER" PEER -- peer's name | |
1061 | * | |
1062 | * * "?ERRNO" ERRNO -- system error code | |
1063 | * | |
1064 | * * "[!]..." ... -- @dstr_putf@-like string as single token | |
1065 | */ | |
1066 | ||
b730d38c | 1067 | extern void a_vformat(dstr */*d*/, const char */*fmt*/, va_list */*ap*/); |
7f73baaf | 1068 | |
f241e36c MW |
1069 | /* --- @a_format@ --- * |
1070 | * | |
1071 | * Arguments: @dstr *d@ = where to leave the formatted message | |
1072 | * @const char *fmt@ = pointer to format string | |
1073 | * | |
1074 | * Returns: --- | |
1075 | * | |
1076 | * Use: Writes a tokenized message into a string, for later | |
1077 | * presentation. | |
1078 | */ | |
1079 | ||
ddb384f1 | 1080 | extern void EXECL_LIKE(0) a_format(dstr */*d*/, const char */*fmt*/, ...); |
f241e36c | 1081 | |
fe182f61 MW |
1082 | /* --- @a_info@ --- * |
1083 | * | |
1084 | * Arguments: @admin *a@ = connection | |
1085 | * @const char *fmt@ = format string | |
1086 | * @...@ = other arguments | |
1087 | * | |
1088 | * Returns: --- | |
1089 | * | |
1090 | * Use: Report information to an admin client. | |
1091 | */ | |
1092 | ||
1093 | extern void EXECL_LIKE(0) a_info(admin */*a*/, const char */*fmt*/, ...); | |
1094 | ||
410c8acf | 1095 | /* --- @a_warn@ --- * |
1096 | * | |
1097 | * Arguments: @const char *fmt@ = pointer to format string | |
1098 | * @...@ = other arguments | |
1099 | * | |
1100 | * Returns: --- | |
1101 | * | |
1102 | * Use: Informs all admin connections of a warning. | |
1103 | */ | |
1104 | ||
ddb384f1 | 1105 | extern void EXECL_LIKE(0) a_warn(const char */*fmt*/, ...); |
410c8acf | 1106 | |
3cdc3f3a | 1107 | /* --- @a_notify@ --- * |
1108 | * | |
1109 | * Arguments: @const char *fmt@ = pointer to format string | |
1110 | * @...@ = other arguments | |
1111 | * | |
1112 | * Returns: --- | |
1113 | * | |
1114 | * Use: Sends a notification to interested admin connections. | |
1115 | */ | |
1116 | ||
ddb384f1 | 1117 | extern void EXECL_LIKE(0) a_notify(const char */*fmt*/, ...); |
3cdc3f3a | 1118 | |
410c8acf | 1119 | /* --- @a_create@ --- * |
1120 | * | |
1121 | * Arguments: @int fd_in, fd_out@ = file descriptors to use | |
3cdc3f3a | 1122 | * @unsigned f@ = initial flags to set |
410c8acf | 1123 | * |
1124 | * Returns: --- | |
1125 | * | |
1126 | * Use: Creates a new admin connection. | |
1127 | */ | |
1128 | ||
3cdc3f3a | 1129 | extern void a_create(int /*fd_in*/, int /*fd_out*/, unsigned /*f*/); |
410c8acf | 1130 | |
1131 | /* --- @a_quit@ --- * | |
1132 | * | |
1133 | * Arguments: --- | |
1134 | * | |
1135 | * Returns: --- | |
1136 | * | |
1137 | * Use: Shuts things down nicely. | |
1138 | */ | |
1139 | ||
1140 | extern void a_quit(void); | |
1141 | ||
c511e1f9 MW |
1142 | /* --- @a_preselect@ --- * |
1143 | * | |
1144 | * Arguments: --- | |
1145 | * | |
1146 | * Returns: --- | |
1147 | * | |
1148 | * Use: Informs the admin module that we're about to select again, | |
1149 | * and that it should do cleanup things it has delayed until a | |
1150 | * `safe' time. | |
1151 | */ | |
1152 | ||
1153 | extern void a_preselect(void); | |
1154 | ||
410c8acf | 1155 | /* --- @a_daemon@ --- * |
1156 | * | |
1157 | * Arguments: --- | |
1158 | * | |
1159 | * Returns: --- | |
1160 | * | |
1161 | * Use: Informs the admin module that it's a daemon. | |
1162 | */ | |
1163 | ||
1164 | extern void a_daemon(void); | |
1165 | ||
1166 | /* --- @a_init@ --- * | |
1167 | * | |
1168 | * Arguments: @const char *sock@ = socket name to create | |
aa2405e8 MW |
1169 | * @uid_t u@ = user to own the socket |
1170 | * @gid_t g@ = group to own the socket | |
a9279e37 | 1171 | * @mode_t m@ = permissions to set on the socket |
410c8acf | 1172 | * |
1173 | * Returns: --- | |
1174 | * | |
1175 | * Use: Creates the admin listening socket. | |
1176 | */ | |
1177 | ||
a9279e37 MW |
1178 | extern void a_init(const char */*sock*/, |
1179 | uid_t /*u*/, gid_t /*g*/, mode_t /*m*/); | |
410c8acf | 1180 | |
c8e02c8a MW |
1181 | /*----- Mapping with addresses as keys ------------------------------------*/ |
1182 | ||
1183 | /* --- @am_create@ --- * | |
1184 | * | |
1185 | * Arguments: @addrmap *m@ = pointer to map | |
1186 | * | |
1187 | * Returns: --- | |
1188 | * | |
1189 | * Use: Create an address map, properly set up. | |
1190 | */ | |
1191 | ||
1192 | extern void am_create(addrmap */*m*/); | |
1193 | ||
1194 | /* --- @am_destroy@ --- * | |
1195 | * | |
1196 | * Arguments: @addrmap *m@ = pointer to map | |
1197 | * | |
1198 | * Returns: --- | |
1199 | * | |
1200 | * Use: Destroy an address map, throwing away all the entries. | |
1201 | */ | |
1202 | ||
1203 | extern void am_destroy(addrmap */*m*/); | |
1204 | ||
1205 | /* --- @am_find@ --- * | |
1206 | * | |
1207 | * Arguments: @addrmap *m@ = pointer to map | |
1208 | * @const addr *a@ = address to look up | |
1209 | * @size_t sz@ = size of block to allocate | |
1210 | * @unsigned *f@ = where to store flags | |
1211 | * | |
1212 | * Returns: Pointer to found item, or null. | |
1213 | * | |
1214 | * Use: Finds a record with the given IP address, set @*f@ nonzero | |
1215 | * and returns it. If @sz@ is zero, and no match was found, | |
1216 | * return null; otherwise allocate a new block of @sz@ bytes, | |
1217 | * clear @*f@ to zero and return the block pointer. | |
1218 | */ | |
1219 | ||
1220 | extern void *am_find(addrmap */*m*/, const addr */*a*/, | |
1221 | size_t /*sz*/, unsigned */*f*/); | |
1222 | ||
1223 | /* --- @am_remove@ --- * | |
1224 | * | |
1225 | * Arguments: @addrmap *m@ = pointer to map | |
1226 | * @void *i@ = pointer to the item | |
1227 | * | |
1228 | * Returns: --- | |
1229 | * | |
1230 | * Use: Removes an item from the map. | |
1231 | */ | |
1232 | ||
1233 | extern void am_remove(addrmap */*m*/, void */*i*/); | |
1234 | ||
388e0319 MW |
1235 | /*----- Privilege separation ----------------------------------------------*/ |
1236 | ||
1237 | /* --- @ps_trace@ --- * | |
1238 | * | |
1239 | * Arguments: @unsigned mask@ = trace mask to check | |
1240 | * @const char *fmt@ = message format | |
1241 | * @...@ = values for placeholders | |
1242 | * | |
1243 | * Returns: --- | |
1244 | * | |
1245 | * Use: Writes a trace message. | |
1246 | */ | |
1247 | ||
ddb384f1 MW |
1248 | T( extern void PRINTF_LIKE(2, 3) |
1249 | ps_trace(unsigned /*mask*/, const char */*fmt*/, ...); ) | |
388e0319 MW |
1250 | |
1251 | /* --- @ps_warn@ --- * | |
1252 | * | |
1253 | * Arguments: @const char *fmt@ = message format | |
1254 | * @...@ = values for placeholders | |
1255 | * | |
1256 | * Returns: --- | |
1257 | * | |
1258 | * Use: Writes a warning message. | |
1259 | */ | |
1260 | ||
ddb384f1 | 1261 | extern void PRINTF_LIKE(1, 2) ps_warn(const char */*fmt*/, ...); |
388e0319 MW |
1262 | |
1263 | /* --- @ps_tunfd@ --- * | |
1264 | * | |
1265 | * Arguments: @const tunnel_ops *tops@ = pointer to tunnel operations | |
1266 | * @char **ifn@ = where to put the interface name | |
1267 | * | |
1268 | * Returns: The file descriptor, or @-1@ on error. | |
1269 | * | |
1270 | * Use: Fetches a file descriptor for a tunnel driver. | |
1271 | */ | |
1272 | ||
1273 | extern int ps_tunfd(const tunnel_ops */*tops*/, char **/*ifn*/); | |
1274 | ||
1275 | /* --- @ps_split@ --- * | |
1276 | * | |
1277 | * Arguments: @int detachp@ = whether to detach the child from its terminal | |
1278 | * | |
1279 | * Returns: --- | |
1280 | * | |
1281 | * Use: Separates off the privileged tunnel-opening service from the | |
1282 | * rest of the server. | |
1283 | */ | |
1284 | ||
1285 | extern void ps_split(int /*detachp*/); | |
1286 | ||
1287 | /* --- @ps_quit@ --- * | |
1288 | * | |
1289 | * Arguments: --- | |
1290 | * | |
1291 | * Returns: --- | |
1292 | * | |
1293 | * Use: Detaches from the helper process. | |
1294 | */ | |
1295 | ||
1296 | extern void ps_quit(void); | |
1297 | ||
410c8acf | 1298 | /*----- Peer management ---------------------------------------------------*/ |
1299 | ||
1300 | /* --- @p_txstart@ --- * | |
1301 | * | |
1302 | * Arguments: @peer *p@ = pointer to peer block | |
1303 | * @unsigned msg@ = message type code | |
1304 | * | |
1305 | * Returns: A pointer to a buffer to write to. | |
1306 | * | |
1307 | * Use: Starts sending to a peer. Only one send can happen at a | |
1308 | * time. | |
1309 | */ | |
1310 | ||
1311 | extern buf *p_txstart(peer */*p*/, unsigned /*msg*/); | |
1312 | ||
1313 | /* --- @p_txend@ --- * | |
1314 | * | |
1315 | * Arguments: @peer *p@ = pointer to peer block | |
1316 | * | |
1317 | * Returns: --- | |
1318 | * | |
1319 | * Use: Sends a packet to the peer. | |
1320 | */ | |
1321 | ||
1322 | extern void p_txend(peer */*p*/); | |
1323 | ||
0ba8de86 | 1324 | /* --- @p_pingsend@ --- * |
1325 | * | |
1326 | * Arguments: @peer *p@ = destination peer | |
1327 | * @ping *pg@ = structure to fill in | |
1328 | * @unsigned type@ = message type | |
1329 | * @unsigned long timeout@ = how long to wait before giving up | |
1330 | * @void (*func)(int, void *)@ = callback function | |
1331 | * @void *arg@ = argument for callback | |
1332 | * | |
1333 | * Returns: Zero if successful, nonzero if it failed. | |
1334 | * | |
1335 | * Use: Sends a ping to a peer. Call @func@ with a nonzero argument | |
1336 | * if we get an answer within the timeout, or zero if no answer. | |
1337 | */ | |
1338 | ||
1339 | extern int p_pingsend(peer */*p*/, ping */*pg*/, unsigned /*type*/, | |
1340 | unsigned long /*timeout*/, | |
1341 | void (*/*func*/)(int, void *), void */*arg*/); | |
1342 | ||
1343 | /* --- @p_pingdone@ --- * | |
1344 | * | |
1345 | * Arguments: @ping *p@ = ping structure | |
1346 | * @int rc@ = return code to pass on | |
1347 | * | |
1348 | * Returns: --- | |
1349 | * | |
1350 | * Use: Disposes of a ping structure, maybe sending a notification. | |
1351 | */ | |
1352 | ||
1353 | extern void p_pingdone(ping */*p*/, int /*rc*/); | |
1354 | ||
37941236 | 1355 | /* --- @p_greet@ --- * |
1356 | * | |
1357 | * Arguments: @peer *p@ = peer to send to | |
1358 | * @const void *c@ = pointer to challenge | |
1359 | * @size_t sz@ = size of challenge | |
1360 | * | |
1361 | * Returns: --- | |
1362 | * | |
1363 | * Use: Sends a greeting packet. | |
1364 | */ | |
1365 | ||
1366 | extern void p_greet(peer */*p*/, const void */*c*/, size_t /*sz*/); | |
1367 | ||
410c8acf | 1368 | /* --- @p_tun@ --- * |
1369 | * | |
1370 | * Arguments: @peer *p@ = pointer to peer block | |
1371 | * @buf *b@ = buffer containing incoming packet | |
1372 | * | |
1373 | * Returns: --- | |
1374 | * | |
1375 | * Use: Handles a packet which needs to be sent to a peer. | |
1376 | */ | |
1377 | ||
1378 | extern void p_tun(peer */*p*/, buf */*b*/); | |
1379 | ||
de014da6 | 1380 | /* --- @p_keyreload@ --- * |
1381 | * | |
1382 | * Arguments: --- | |
1383 | * | |
1384 | * Returns: --- | |
1385 | * | |
1386 | * Use: Forces a check of the daemon's keyring files. | |
1387 | */ | |
1388 | ||
1389 | extern void p_keyreload(void); | |
1390 | ||
410c8acf | 1391 | /* --- @p_interval@ --- * |
1392 | * | |
1393 | * Arguments: --- | |
1394 | * | |
1395 | * Returns: --- | |
1396 | * | |
1397 | * Use: Called periodically to do tidying. | |
1398 | */ | |
1399 | ||
1400 | extern void p_interval(void); | |
1401 | ||
832a2ab6 | 1402 | /* --- @p_stats@ --- * |
1403 | * | |
1404 | * Arguments: @peer *p@ = pointer to a peer block | |
1405 | * | |
1406 | * Returns: A pointer to the peer's statistics. | |
1407 | */ | |
1408 | ||
1409 | extern stats *p_stats(peer */*p*/); | |
1410 | ||
410c8acf | 1411 | /* --- @p_ifname@ --- * |
1412 | * | |
1413 | * Arguments: @peer *p@ = pointer to a peer block | |
1414 | * | |
1415 | * Returns: A pointer to the peer's interface name. | |
1416 | */ | |
1417 | ||
1418 | extern const char *p_ifname(peer */*p*/); | |
1419 | ||
64cf2223 MW |
1420 | /* --- @p_setifname@ --- * |
1421 | * | |
1422 | * Arguments: @peer *p@ = pointer to a peer block | |
1423 | * @const char *name@ = pointer to the new name | |
1424 | * | |
1425 | * Returns: --- | |
1426 | * | |
1427 | * Use: Changes the name held for a peer's interface. | |
1428 | */ | |
1429 | ||
1430 | extern void p_setifname(peer */*p*/, const char */*name*/); | |
1431 | ||
410c8acf | 1432 | /* --- @p_addr@ --- * |
1433 | * | |
1434 | * Arguments: @peer *p@ = pointer to a peer block | |
1435 | * | |
1436 | * Returns: A pointer to the peer's address. | |
1437 | */ | |
1438 | ||
1439 | extern const addr *p_addr(peer */*p*/); | |
1440 | ||
1441 | /* --- @p_init@ --- * | |
1442 | * | |
767b36e2 | 1443 | * Arguments: @struct in_addr addr@ = address to bind to |
1444 | * @unsigned port@ = port number to listen to | |
410c8acf | 1445 | * |
1446 | * Returns: --- | |
1447 | * | |
1448 | * Use: Initializes the peer system; creates the socket. | |
1449 | */ | |
1450 | ||
767b36e2 | 1451 | extern void p_init(struct in_addr /*addr*/, unsigned /*port*/); |
410c8acf | 1452 | |
1453 | /* --- @p_port@ --- * | |
1454 | * | |
1455 | * Arguments: --- | |
1456 | * | |
1457 | * Returns: Port number used for socket. | |
1458 | */ | |
1459 | ||
1460 | unsigned p_port(void); | |
1461 | ||
1462 | /* --- @p_create@ --- * | |
1463 | * | |
0ba8de86 | 1464 | * Arguments: @peerspec *spec@ = information about this peer |
410c8acf | 1465 | * |
1466 | * Returns: Pointer to the peer block, or null if it failed. | |
1467 | * | |
1468 | * Use: Creates a new named peer block. No peer is actually attached | |
1469 | * by this point. | |
1470 | */ | |
1471 | ||
0ba8de86 | 1472 | extern peer *p_create(peerspec */*spec*/); |
410c8acf | 1473 | |
1474 | /* --- @p_name@ --- * | |
1475 | * | |
1476 | * Arguments: @peer *p@ = pointer to a peer block | |
1477 | * | |
1478 | * Returns: A pointer to the peer's name. | |
060ca767 | 1479 | * |
1480 | * Use: Equivalent to @p_spec(p)->name@. | |
410c8acf | 1481 | */ |
1482 | ||
1483 | extern const char *p_name(peer */*p*/); | |
1484 | ||
48b84569 MW |
1485 | /* --- @p_tag@ --- * |
1486 | * | |
1487 | * Arguments: @peer *p@ = pointer to a peer block | |
1488 | * | |
1489 | * Returns: A pointer to the peer's public key tag. | |
1490 | */ | |
1491 | ||
1492 | extern const char *p_tag(peer */*p*/); | |
1493 | ||
fe2a5dcf MW |
1494 | /* --- @p_privtag@ --- * |
1495 | * | |
1496 | * Arguments: @peer *p@ = pointer to a peer block | |
1497 | * | |
1498 | * Returns: A pointer to the peer's private key tag. | |
1499 | */ | |
1500 | ||
1501 | extern const char *p_privtag(peer */*p*/); | |
1502 | ||
060ca767 | 1503 | /* --- @p_spec@ --- * |
1504 | * | |
1505 | * Arguments: @peer *p@ = pointer to a peer block | |
1506 | * | |
1507 | * Returns: Pointer to the peer's specification | |
1508 | */ | |
1509 | ||
1510 | extern const peerspec *p_spec(peer */*p*/); | |
1511 | ||
c8e02c8a MW |
1512 | /* --- @p_findbyaddr@ --- * |
1513 | * | |
1514 | * Arguments: @const addr *a@ = address to look up | |
1515 | * | |
1516 | * Returns: Pointer to the peer block, or null if not found. | |
1517 | * | |
1518 | * Use: Finds a peer by address. | |
1519 | */ | |
1520 | ||
1521 | extern peer *p_findbyaddr(const addr */*a*/); | |
1522 | ||
410c8acf | 1523 | /* --- @p_find@ --- * |
1524 | * | |
1525 | * Arguments: @const char *name@ = name to look up | |
1526 | * | |
1527 | * Returns: Pointer to the peer block, or null if not found. | |
1528 | * | |
1529 | * Use: Finds a peer by name. | |
1530 | */ | |
1531 | ||
1532 | extern peer *p_find(const char */*name*/); | |
1533 | ||
1534 | /* --- @p_destroy@ --- * | |
1535 | * | |
1536 | * Arguments: @peer *p@ = pointer to a peer | |
1537 | * | |
1538 | * Returns: --- | |
1539 | * | |
1540 | * Use: Destroys a peer. | |
1541 | */ | |
1542 | ||
1543 | extern void p_destroy(peer */*p*/); | |
1544 | ||
c8e02c8a MW |
1545 | /* --- @FOREACH_PEER@ --- * |
1546 | * | |
1547 | * Arguments: @p@ = name to bind to each peer | |
1548 | * @stuff@ = thing to do for each item | |
1549 | * | |
1550 | * Use: Does something for each current peer. | |
1551 | */ | |
1552 | ||
1553 | #define FOREACH_PEER(p, stuff) do { \ | |
1554 | peer_iter i_; \ | |
1555 | peer *p; \ | |
46401b81 | 1556 | for (p_mkiter(&i_); (p = p_next(&i_)) != 0; ) stuff \ |
c8e02c8a MW |
1557 | } while (0) |
1558 | ||
1559 | /* --- @p_mkiter@ --- * | |
1560 | * | |
1561 | * Arguments: @peer_iter *i@ = pointer to an iterator | |
1562 | * | |
1563 | * Returns: --- | |
1564 | * | |
1565 | * Use: Initializes the iterator. | |
1566 | */ | |
1567 | ||
1568 | extern void p_mkiter(peer_iter */*i*/); | |
1569 | ||
1570 | /* --- @p_next@ --- * | |
1571 | * | |
1572 | * Arguments: @peer_iter *i@ = pointer to an iterator | |
410c8acf | 1573 | * |
c8e02c8a | 1574 | * Returns: Next peer, or null if at the end. |
410c8acf | 1575 | * |
c8e02c8a | 1576 | * Use: Returns the next peer. |
410c8acf | 1577 | */ |
1578 | ||
c8e02c8a | 1579 | extern peer *p_next(peer_iter */*i*/); |
410c8acf | 1580 | |
42da2a58 | 1581 | /*----- Tunnel drivers ----------------------------------------------------*/ |
410c8acf | 1582 | |
42da2a58 | 1583 | #ifdef TUN_LINUX |
1584 | extern const tunnel_ops tun_linux; | |
1585 | #endif | |
410c8acf | 1586 | |
42da2a58 | 1587 | #ifdef TUN_UNET |
1588 | extern const tunnel_ops tun_unet; | |
1589 | #endif | |
410c8acf | 1590 | |
42da2a58 | 1591 | #ifdef TUN_BSD |
1592 | extern const tunnel_ops tun_bsd; | |
1593 | #endif | |
410c8acf | 1594 | |
42da2a58 | 1595 | extern const tunnel_ops tun_slip; |
410c8acf | 1596 | |
410c8acf | 1597 | /*----- Other handy utilities ---------------------------------------------*/ |
1598 | ||
1599 | /* --- @mpstr@ --- * | |
1600 | * | |
1601 | * Arguments: @mp *m@ = a multiprecision integer | |
1602 | * | |
1603 | * Returns: A pointer to the integer's textual representation. | |
1604 | * | |
1605 | * Use: Converts a multiprecision integer to a string. Corrupts | |
a4b808b0 | 1606 | * @buf_u@. |
410c8acf | 1607 | */ |
1608 | ||
1609 | extern const char *mpstr(mp */*m*/); | |
1610 | ||
52c03a2a | 1611 | /* --- @gestr@ --- * |
1612 | * | |
1613 | * Arguments: @group *g@ = a group | |
1614 | * @ge *x@ = a group element | |
1615 | * | |
1616 | * Returns: A pointer to the element's textual representation. | |
1617 | * | |
1618 | * Use: Converts a group element to a string. Corrupts | |
a4b808b0 | 1619 | * @buf_u@. |
52c03a2a | 1620 | */ |
1621 | ||
1622 | extern const char *gestr(group */*g*/, ge */*x*/); | |
1623 | ||
832a2ab6 | 1624 | /* --- @timestr@ --- * |
1625 | * | |
1626 | * Arguments: @time_t t@ = a time to convert | |
1627 | * | |
1628 | * Returns: A pointer to a textual representation of the time. | |
1629 | * | |
1630 | * Use: Converts a time to a textual representation. Corrupts | |
a4b808b0 | 1631 | * @buf_u@. |
832a2ab6 | 1632 | */ |
1633 | ||
1634 | extern const char *timestr(time_t /*t*/); | |
1635 | ||
42da2a58 | 1636 | /* --- @mystrieq@ --- * |
1637 | * | |
1638 | * Arguments: @const char *x, *y@ = two strings | |
1639 | * | |
1640 | * Returns: True if @x@ and @y are equal, up to case. | |
1641 | */ | |
1642 | ||
1643 | extern int mystrieq(const char */*x*/, const char */*y*/); | |
1644 | ||
37941236 | 1645 | /* --- @seq_reset@ --- * |
1646 | * | |
1647 | * Arguments: @seqwin *s@ = sequence-checking window | |
1648 | * | |
1649 | * Returns: --- | |
1650 | * | |
1651 | * Use: Resets a sequence number window. | |
1652 | */ | |
1653 | ||
1654 | extern void seq_reset(seqwin */*s*/); | |
1655 | ||
1656 | /* --- @seq_check@ --- * | |
1657 | * | |
1658 | * Arguments: @seqwin *s@ = sequence-checking window | |
1659 | * @uint32 q@ = sequence number to check | |
f43df819 | 1660 | * @const char *service@ = service to report message from |
37941236 | 1661 | * |
1662 | * Returns: A @SEQ_@ code. | |
1663 | * | |
1664 | * Use: Checks a sequence number against the window, updating things | |
1665 | * as necessary. | |
1666 | */ | |
1667 | ||
f43df819 | 1668 | extern int seq_check(seqwin */*s*/, uint32 /*q*/, const char */*service*/); |
37941236 | 1669 | |
410c8acf | 1670 | /*----- That's all, folks -------------------------------------------------*/ |
1671 | ||
1672 | #ifdef __cplusplus | |
1673 | } | |
1674 | #endif | |
1675 | ||
1676 | #endif |