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> | |
55 | ||
56 | #include <sys/socket.h> | |
57 | #include <sys/un.h> | |
58 | #include <netinet/in.h> | |
59 | #include <arpa/inet.h> | |
60 | #include <netdb.h> | |
61 | ||
62 | #include <pwd.h> | |
63 | #include <grp.h> | |
64 | ||
65 | #include <mLib/alloc.h> | |
66 | #include <mLib/arena.h> | |
37941236 | 67 | #include <mLib/base64.h> |
410c8acf | 68 | #include <mLib/bres.h> |
19dd2531 | 69 | #include <mLib/daemonize.h> |
410c8acf | 70 | #include <mLib/dstr.h> |
71 | #include <mLib/env.h> | |
72 | #include <mLib/fdflags.h> | |
73 | #include <mLib/fwatch.h> | |
c8e02c8a | 74 | #include <mLib/hash.h> |
165efde7 | 75 | #include <mLib/macros.h> |
410c8acf | 76 | #include <mLib/mdwopt.h> |
77 | #include <mLib/quis.h> | |
78 | #include <mLib/report.h> | |
79 | #include <mLib/sel.h> | |
80 | #include <mLib/selbuf.h> | |
81 | #include <mLib/sig.h> | |
82 | #include <mLib/str.h> | |
83 | #include <mLib/sub.h> | |
84 | #include <mLib/trace.h> | |
0ba8de86 | 85 | #include <mLib/tv.h> |
19dd2531 | 86 | #include <mLib/versioncmp.h> |
410c8acf | 87 | |
165db1a8 | 88 | #include <catacomb/buf.h> |
89 | ||
410c8acf | 90 | #include <catacomb/gcipher.h> |
91 | #include <catacomb/gmac.h> | |
92 | #include <catacomb/grand.h> | |
93 | #include <catacomb/key.h> | |
94 | #include <catacomb/paranoia.h> | |
95 | ||
410c8acf | 96 | #include <catacomb/noise.h> |
97 | #include <catacomb/rand.h> | |
410c8acf | 98 | |
99 | #include <catacomb/mp.h> | |
410c8acf | 100 | #include <catacomb/mprand.h> |
101 | #include <catacomb/dh.h> | |
52c03a2a | 102 | #include <catacomb/ec.h> |
103 | #include <catacomb/ec-keys.h> | |
104 | #include <catacomb/group.h> | |
410c8acf | 105 | |
78698994 | 106 | #include "protocol.h" |
410c8acf | 107 | #include "util.h" |
108 | ||
109 | #undef sun | |
110 | ||
111 | /*----- Magic numbers -----------------------------------------------------*/ | |
112 | ||
410c8acf | 113 | /* --- Trace flags --- */ |
114 | ||
115 | #define T_TUNNEL 1u | |
116 | #define T_PEER 2u | |
117 | #define T_PACKET 4u | |
118 | #define T_ADMIN 8u | |
119 | #define T_CRYPTO 16u | |
120 | #define T_KEYSET 32u | |
121 | #define T_KEYEXCH 64u | |
122 | #define T_KEYMGMT 128u | |
37941236 | 123 | #define T_CHAL 256u |
410c8acf | 124 | |
37941236 | 125 | #define T_ALL 511u |
410c8acf | 126 | |
127 | /* --- Units --- */ | |
128 | ||
129 | #define SEC(n) (n##u) | |
130 | #define MIN(n) (n##u * 60u) | |
131 | #define MEG(n) (n##ul * 1024ul * 1024ul) | |
132 | ||
133 | /* --- Other things --- */ | |
134 | ||
135 | #define PKBUFSZ 65536 | |
136 | ||
832a2ab6 | 137 | /*----- Cipher selections -------------------------------------------------*/ |
138 | ||
b5c45da1 | 139 | typedef struct algswitch { |
140 | const gccipher *c; /* Symmetric encryption scheme */ | |
141 | const gccipher *mgf; /* Mask-generation function */ | |
142 | const gchash *h; /* Hash function */ | |
143 | const gcmac *m; /* Message authentication code */ | |
144 | size_t hashsz; /* Hash output size */ | |
145 | size_t tagsz; /* Length to truncate MAC tags */ | |
146 | size_t cksz, mksz; /* Key lengths for @c@ and @m@ */ | |
147 | } algswitch; | |
832a2ab6 | 148 | |
b5c45da1 | 149 | extern algswitch algs; |
832a2ab6 | 150 | |
b5c45da1 | 151 | #define MAXHASHSZ 64 /* Largest possible hash size */ |
832a2ab6 | 152 | |
b5c45da1 | 153 | #define HASH_STRING(h, s) GH_HASH((h), (s), sizeof(s)) |
410c8acf | 154 | |
aeeb5611 | 155 | /*----- Data structures ---------------------------------------------------*/ |
410c8acf | 156 | |
157 | /* --- Socket addresses --- * | |
158 | * | |
159 | * A magic union of supported socket addresses. | |
160 | */ | |
161 | ||
162 | typedef union addr { | |
163 | struct sockaddr sa; | |
164 | struct sockaddr_in sin; | |
165 | } addr; | |
166 | ||
c8e02c8a MW |
167 | /* --- Mapping keyed on addresses --- */ |
168 | ||
169 | typedef struct addrmap { | |
170 | hash_table t; | |
171 | size_t load; | |
172 | } addrmap; | |
173 | ||
174 | typedef struct addrmap_base { | |
175 | hash_base b; | |
176 | addr a; | |
177 | } addrmap_base; | |
178 | ||
37941236 | 179 | /* --- Sequence number checking --- */ |
180 | ||
181 | typedef struct seqwin { | |
182 | uint32 seq; /* First acceptable input sequence */ | |
183 | uint32 win; /* Window of acceptable numbers */ | |
184 | } seqwin; | |
185 | ||
186 | #define SEQ_WINSZ 32 /* Bits in sequence number window */ | |
187 | ||
410c8acf | 188 | /* --- A symmetric keyset --- * |
189 | * | |
190 | * A keyset contains a set of symmetric keys for encrypting and decrypting | |
191 | * packets. Keysets are stored in a list, sorted in reverse order of | |
192 | * creation, so that the most recent keyset (the one most likely to be used) | |
193 | * is first. | |
194 | * | |
195 | * Each keyset has a time limit and a data limit. The keyset is destroyed | |
196 | * when either it has existed for too long, or it has been used to encrypt | |
197 | * too much data. New key exchanges are triggered when keys are close to | |
198 | * expiry. | |
199 | */ | |
200 | ||
201 | typedef struct keyset { | |
202 | struct keyset *next; /* Next active keyset in the list */ | |
832a2ab6 | 203 | unsigned ref; /* Reference count for keyset */ |
9466fafa | 204 | struct peer *p; /* Pointer to peer structure */ |
410c8acf | 205 | time_t t_exp; /* Expiry time for this keyset */ |
206 | unsigned long sz_exp; /* Data limit for the keyset */ | |
832a2ab6 | 207 | T( unsigned seq; ) /* Sequence number for tracing */ |
208 | unsigned f; /* Various useful flags */ | |
e04c2d50 | 209 | gcipher *cin, *cout; /* Keyset ciphers for encryption */ |
b5c45da1 | 210 | size_t tagsz; /* Length to truncate MAC tags */ |
e04c2d50 | 211 | gmac *min, *mout; /* Keyset MACs for integrity */ |
1484d822 | 212 | uint32 oseq; /* Outbound sequence number */ |
37941236 | 213 | seqwin iseq; /* Inbound sequence number */ |
410c8acf | 214 | } keyset; |
215 | ||
832a2ab6 | 216 | #define KSF_LISTEN 1u /* Don't encrypt packets yet */ |
217 | #define KSF_LINK 2u /* Key is in a linked list */ | |
218 | ||
410c8acf | 219 | /* --- Key exchange --- * |
220 | * | |
221 | * TrIPE uses the Wrestlers Protocol for its key exchange. The Wrestlers | |
222 | * Protocol has a number of desirable features (e.g., perfect forward | |
223 | * secrecy, and zero-knowledge authentication) which make it attractive for | |
224 | * use in TrIPE. The Wrestlers Protocol was designed by Mark Wooding and | |
225 | * Clive Jones. | |
226 | */ | |
227 | ||
832a2ab6 | 228 | #define KX_NCHAL 16u |
832a2ab6 | 229 | |
230 | typedef struct kxchal { | |
231 | struct keyexch *kx; /* Pointer back to key exchange */ | |
52c03a2a | 232 | ge *c; /* Responder's challenge */ |
233 | ge *r; /* My reply to the challenge */ | |
832a2ab6 | 234 | keyset *ks; /* Pointer to temporary keyset */ |
235 | unsigned f; /* Various useful flags */ | |
236 | sel_timer t; /* Response timer for challenge */ | |
b5c45da1 | 237 | octet hc[MAXHASHSZ]; /* Hash of his challenge */ |
de7bd20b | 238 | octet ck[MAXHASHSZ]; /* His magical check value */ |
b5c45da1 | 239 | octet hswrq_in[MAXHASHSZ]; /* Inbound switch request message */ |
240 | octet hswok_in[MAXHASHSZ]; /* Inbound switch confirmation */ | |
241 | octet hswrq_out[MAXHASHSZ]; /* Outbound switch request message */ | |
242 | octet hswok_out[MAXHASHSZ]; /* Outbound switch confirmation */ | |
832a2ab6 | 243 | } kxchal; |
244 | ||
410c8acf | 245 | typedef struct keyexch { |
410c8acf | 246 | struct peer *p; /* Pointer back to the peer */ |
832a2ab6 | 247 | keyset **ks; /* Peer's list of keysets */ |
410c8acf | 248 | unsigned f; /* Various useful flags */ |
832a2ab6 | 249 | unsigned s; /* Current state in exchange */ |
410c8acf | 250 | sel_timer t; /* Timer for next exchange */ |
52c03a2a | 251 | ge *kpub; /* Peer's public key */ |
00e64b67 | 252 | time_t texp_kpub; /* Expiry time for public key */ |
832a2ab6 | 253 | mp *alpha; /* My temporary secret */ |
52c03a2a | 254 | ge *c; /* My challenge */ |
255 | ge *rx; /* The expected response */ | |
832a2ab6 | 256 | unsigned nr; /* Number of extant responses */ |
410c8acf | 257 | time_t t_valid; /* When this exchange goes bad */ |
b5c45da1 | 258 | octet hc[MAXHASHSZ]; /* Hash of my challenge */ |
832a2ab6 | 259 | kxchal *r[KX_NCHAL]; /* Array of challenges */ |
410c8acf | 260 | } keyexch; |
261 | ||
262 | #define KXF_TIMER 1u /* Waiting for a timer to go off */ | |
00e64b67 | 263 | #define KXF_DEAD 2u /* The key-exchanger isn't up */ |
264 | #define KXF_PUBKEY 4u /* Key exchanger has a public key */ | |
010e6f63 | 265 | #define KXF_CORK 8u /* Don't send anything yet */ |
832a2ab6 | 266 | |
267 | enum { | |
268 | KXS_DEAD, /* Uninitialized state (magical) */ | |
269 | KXS_CHAL, /* Main answer-challenges state */ | |
270 | KXS_COMMIT, /* Committed: send switch request */ | |
271 | KXS_SWITCH /* Switched: send confirmation */ | |
272 | }; | |
410c8acf | 273 | |
274 | /* --- Tunnel structure --- * | |
275 | * | |
276 | * Used to maintain system-specific information about the tunnel interface. | |
277 | */ | |
278 | ||
42da2a58 | 279 | typedef struct tunnel tunnel; |
280 | struct peer; | |
110d564e | 281 | |
42da2a58 | 282 | typedef struct tunnel_ops { |
283 | const char *name; /* Name of this tunnel driver */ | |
284 | void (*init)(void); /* Initializes the system */ | |
72917fe7 MW |
285 | tunnel *(*create)(struct peer */*p*/, char **/*ifn*/); |
286 | /* Initializes a new tunnel */ | |
287 | void (*setifname)(tunnel */*t*/, const char */*ifn*/); | |
288 | /* Notifies ifname change */ | |
42da2a58 | 289 | void (*inject)(tunnel */*t*/, buf */*b*/); /* Sends packet through if */ |
290 | void (*destroy)(tunnel */*t*/); /* Destroys a tunnel */ | |
291 | } tunnel_ops; | |
b9066fbb | 292 | |
42da2a58 | 293 | #ifndef TUN_INTERNALS |
294 | struct tunnel { const tunnel_ops *ops; }; | |
410c8acf | 295 | #endif |
410c8acf | 296 | |
832a2ab6 | 297 | /* --- Peer statistics --- * |
298 | * | |
299 | * Contains various interesting and not-so-interesting statistics about a | |
300 | * peer. This is updated by various parts of the code. The format of the | |
301 | * structure isn't considered private, and @p_stats@ returns a pointer to the | |
302 | * statistics block for a given peer. | |
303 | */ | |
304 | ||
305 | typedef struct stats { | |
306 | unsigned long sz_in, sz_out; /* Size of all data in and out */ | |
307 | unsigned long sz_kxin, sz_kxout; /* Size of key exchange messages */ | |
308 | unsigned long sz_ipin, sz_ipout; /* Size of encapsulated IP packets */ | |
3cdc3f3a | 309 | time_t t_start, t_last, t_kx; /* Time peer created, last pk, kx */ |
832a2ab6 | 310 | unsigned long n_reject; /* Number of rejected packets */ |
311 | unsigned long n_in, n_out; /* Number of packets in and out */ | |
312 | unsigned long n_kxin, n_kxout; /* Number of key exchange packets */ | |
313 | unsigned long n_ipin, n_ipout; /* Number of encrypted packets */ | |
314 | } stats; | |
315 | ||
410c8acf | 316 | /* --- Peer structure --- * |
317 | * | |
318 | * The main structure which glues everything else together. | |
319 | */ | |
320 | ||
0ba8de86 | 321 | typedef struct peerspec { |
322 | char *name; /* Peer's name */ | |
323 | const tunnel_ops *tops; /* Tunnel operations */ | |
324 | unsigned long t_ka; /* Keep alive interval */ | |
325 | addr sa; /* Socket address to speak to */ | |
326 | size_t sasz; /* Socket address size */ | |
010e6f63 | 327 | unsigned kxf; /* Key exchange flags to set */ |
0ba8de86 | 328 | } peerspec; |
329 | ||
c8e02c8a MW |
330 | typedef struct peer_byname { |
331 | sym_base _b; | |
332 | struct peer *p; | |
333 | } peer_byname; | |
334 | ||
335 | typedef struct peer_byaddr { | |
336 | addrmap_base _b; | |
337 | struct peer *p; | |
338 | } peer_byaddr; | |
339 | ||
410c8acf | 340 | typedef struct peer { |
c8e02c8a MW |
341 | peer_byname *byname; /* Lookup-by-name block */ |
342 | peer_byaddr *byaddr; /* Lookup-by-address block */ | |
0ba8de86 | 343 | struct ping *pings; /* Pings we're waiting for */ |
344 | peerspec spec; /* Specifications for this peer */ | |
42da2a58 | 345 | tunnel *t; /* Tunnel for local packets */ |
64cf2223 | 346 | char *ifname; /* Interface name for tunnel */ |
410c8acf | 347 | keyset *ks; /* List head for keysets */ |
410c8acf | 348 | buf b; /* Buffer for sending packets */ |
832a2ab6 | 349 | stats st; /* Statistics */ |
350 | keyexch kx; /* Key exchange protocol block */ | |
0ba8de86 | 351 | sel_timer tka; /* Timer for keepalives */ |
410c8acf | 352 | } peer; |
353 | ||
c8e02c8a MW |
354 | typedef struct peer_iter { sym_iter i; } peer_iter; |
355 | ||
0ba8de86 | 356 | typedef struct ping { |
357 | struct ping *next, *prev; /* Links to next and previous */ | |
358 | peer *p; /* Peer so we can free it */ | |
359 | unsigned msg; /* Kind of response expected */ | |
360 | uint32 id; /* Id so we can recognize response */ | |
361 | octet magic[32]; /* Some random data */ | |
362 | sel_timer t; /* Timeout for ping */ | |
363 | void (*func)(int /*rc*/, void */*arg*/); /* Function to call when done */ | |
364 | void *arg; /* Argument for callback */ | |
365 | } ping; | |
366 | ||
367 | enum { | |
368 | PING_NONOTIFY = -1, | |
369 | PING_OK = 0, | |
370 | PING_TIMEOUT, | |
371 | PING_PEERDIED, | |
372 | PING_MAX | |
373 | }; | |
374 | ||
410c8acf | 375 | /* --- Admin structure --- */ |
376 | ||
fd3cf232 | 377 | #define OBUFSZ 16384u |
378 | ||
379 | typedef struct obuf { | |
380 | struct obuf *next; /* Next buffer in list */ | |
381 | char *p_in, *p_out; /* Pointers into the buffer */ | |
382 | char buf[OBUFSZ]; /* The actual buffer */ | |
383 | } obuf; | |
384 | ||
de014da6 | 385 | typedef struct oqueue { |
386 | obuf *hd, *tl; /* Head and tail pointers */ | |
387 | } oqueue; | |
388 | ||
389 | struct admin; | |
390 | ||
391 | typedef struct admin_bgop { | |
392 | struct admin_bgop *next, *prev; /* Links to next and previous */ | |
393 | struct admin *a; /* Owner job */ | |
394 | char *tag; /* Tag string for messages */ | |
395 | void (*cancel)(struct admin_bgop *); /* Destructor function */ | |
396 | } admin_bgop; | |
397 | ||
37941236 | 398 | typedef struct admin_resop { |
de014da6 | 399 | admin_bgop bg; /* Background operation header */ |
37941236 | 400 | char *addr; /* Hostname to be resolved */ |
de014da6 | 401 | bres_client r; /* Background resolver task */ |
402 | sel_timer t; /* Timer for resolver */ | |
37941236 | 403 | addr sa; /* Socket address */ |
404 | size_t sasz; /* Socket address size */ | |
405 | void (*func)(struct admin_resop *, int); /* Handler */ | |
406 | } admin_resop; | |
407 | ||
408 | enum { ARES_OK, ARES_FAIL }; | |
409 | ||
410 | typedef struct admin_addop { | |
411 | admin_resop r; /* Name resolution header */ | |
412 | peerspec peer; /* Peer pending creation */ | |
de014da6 | 413 | } admin_addop; |
414 | ||
37941236 | 415 | typedef struct admin_greetop { |
416 | admin_resop r; /* Name resolution header */ | |
417 | void *c; /* Challenge block */ | |
418 | size_t sz; /* Length of challenge */ | |
419 | } admin_greetop; | |
420 | ||
de014da6 | 421 | typedef struct admin_pingop { |
422 | admin_bgop bg; /* Background operation header */ | |
423 | ping ping; /* Ping pending response */ | |
424 | struct timeval pingtime; /* Time last ping was sent */ | |
be6a1b7a MW |
425 | } admin_pingop; |
426 | ||
427 | typedef struct admin_service { | |
428 | sym_base _b; /* Hash table base structure */ | |
429 | char *version; /* The provided version */ | |
430 | struct admin *prov; /* Which client provides me */ | |
431 | struct admin_service *next, *prev; /* Client's list of services */ | |
432 | } admin_service; | |
de014da6 | 433 | |
5d46c0f8 MW |
434 | typedef struct admin_svcop { |
435 | admin_bgop bg; /* Background operation header */ | |
436 | struct admin *prov; /* Client servicing this job */ | |
cc921fba | 437 | unsigned index; /* This job's index */ |
5d46c0f8 MW |
438 | struct admin_svcop *next, *prev; /* Links for provider's jobs */ |
439 | } admin_svcop; | |
440 | ||
441 | typedef struct admin_jobentry { | |
442 | unsigned short seq; /* Zero if unused */ | |
443 | union { | |
444 | admin_svcop *op; /* Operation, if slot in use, ... */ | |
445 | uint32 next; /* ... or index of next free slot */ | |
446 | } u; | |
447 | } admin_jobentry; | |
448 | ||
449 | typedef struct admin_jobtable { | |
450 | uint32 n, sz; /* Used slots and table size */ | |
451 | admin_svcop *active; /* List of active jobs */ | |
452 | uint32 free; /* Index of first free slot */ | |
453 | admin_jobentry *v; /* And the big array of entries */ | |
454 | } admin_jobtable; | |
455 | ||
410c8acf | 456 | typedef struct admin { |
457 | struct admin *next, *prev; /* Links to next and previous */ | |
fd3cf232 | 458 | unsigned f; /* Various useful flags */ |
060ca767 | 459 | unsigned ref; /* Reference counter */ |
410c8acf | 460 | #ifndef NTRACE |
461 | unsigned seq; /* Sequence number for tracing */ | |
462 | #endif | |
de014da6 | 463 | oqueue out; /* Output buffer list */ |
464 | oqueue delay; /* Delayed output buffer list */ | |
465 | admin_bgop *bg; /* Backgrounded operations */ | |
be6a1b7a | 466 | admin_service *svcs; /* Which services I provide */ |
5d46c0f8 | 467 | admin_jobtable j; /* Table of outstanding jobs */ |
fd3cf232 | 468 | selbuf b; /* Line buffer for commands */ |
469 | sel_file w; /* Selector for write buffering */ | |
410c8acf | 470 | } admin; |
471 | ||
fd3cf232 | 472 | #define AF_DEAD 1u /* Destroy this admin block */ |
060ca767 | 473 | #define AF_CLOSE 2u /* Client closed connection */ |
3cdc3f3a | 474 | #define AF_NOTE 4u /* Catch notifications */ |
de014da6 | 475 | #define AF_WARN 8u /* Catch warning messages */ |
3cdc3f3a | 476 | #ifndef NTRACE |
de014da6 | 477 | #define AF_TRACE 16u /* Catch tracing */ |
3cdc3f3a | 478 | #endif |
3cdc3f3a | 479 | |
480 | #ifndef NTRACE | |
481 | # define AF_ALLMSGS (AF_NOTE | AF_TRACE | AF_WARN) | |
482 | #else | |
483 | # define AF_ALLMSGS (AF_NOTE | AF_WARN) | |
484 | #endif | |
fd3cf232 | 485 | |
410c8acf | 486 | /*----- Global variables --------------------------------------------------*/ |
487 | ||
488 | extern sel_state sel; /* Global I/O event state */ | |
52c03a2a | 489 | extern group *gg; /* The group we work in */ |
de7bd20b | 490 | extern size_t indexsz; /* Size of exponent for the group */ |
52c03a2a | 491 | extern mp *kpriv; /* Our private key */ |
9317aa92 | 492 | extern ge *kpub; /* Our public key */ |
832a2ab6 | 493 | extern octet buf_i[PKBUFSZ], buf_o[PKBUFSZ], buf_t[PKBUFSZ]; |
42da2a58 | 494 | extern const tunnel_ops *tunnels[]; /* Table of tunnels (0-term) */ |
495 | extern const tunnel_ops *tun_default; /* Default tunnel to use */ | |
410c8acf | 496 | |
497 | #ifndef NTRACE | |
498 | extern const trace_opt tr_opts[]; /* Trace options array */ | |
499 | extern unsigned tr_flags; /* Trace options flags */ | |
500 | #endif | |
501 | ||
8d0c7a83 | 502 | /*----- Other macros ------------------------------------------------------*/ |
503 | ||
504 | #define TIMER noise_timer(RAND_GLOBAL) | |
505 | ||
410c8acf | 506 | /*----- Key management ----------------------------------------------------*/ |
507 | ||
de014da6 | 508 | /* --- @km_reload@ --- * |
410c8acf | 509 | * |
510 | * Arguments: --- | |
511 | * | |
512 | * Returns: Zero if OK, nonzero to force reloading of keys. | |
513 | * | |
de014da6 | 514 | * Use: Checks the keyrings to see if they need reloading. |
410c8acf | 515 | */ |
516 | ||
de014da6 | 517 | extern int km_reload(void); |
410c8acf | 518 | |
519 | /* --- @km_init@ --- * | |
520 | * | |
521 | * Arguments: @const char *kr_priv@ = private keyring file | |
522 | * @const char *kr_pub@ = public keyring file | |
523 | * @const char *tag@ = tag to load | |
524 | * | |
525 | * Returns: --- | |
526 | * | |
527 | * Use: Initializes, and loads the private key. | |
528 | */ | |
529 | ||
530 | extern void km_init(const char */*kr_priv*/, const char */*kr_pub*/, | |
531 | const char */*tag*/); | |
532 | ||
533 | /* --- @km_getpubkey@ --- * | |
534 | * | |
535 | * Arguments: @const char *tag@ = public key tag to load | |
52c03a2a | 536 | * @ge *kpub@ = where to put the public key |
00e64b67 | 537 | * @time_t *t_exp@ = where to put the expiry time |
410c8acf | 538 | * |
539 | * Returns: Zero if OK, nonzero if it failed. | |
540 | * | |
541 | * Use: Fetches a public key from the keyring. | |
542 | */ | |
543 | ||
52c03a2a | 544 | extern int km_getpubkey(const char */*tag*/, ge */*kpub*/, |
00e64b67 | 545 | time_t */*t_exp*/); |
410c8acf | 546 | |
547 | /*----- Key exchange ------------------------------------------------------*/ | |
548 | ||
549 | /* --- @kx_start@ --- * | |
550 | * | |
551 | * Arguments: @keyexch *kx@ = pointer to key exchange context | |
de014da6 | 552 | * @int forcep@ = nonzero to ignore the quiet timer |
410c8acf | 553 | * |
554 | * Returns: --- | |
555 | * | |
556 | * Use: Stimulates a key exchange. If a key exchage is in progress, | |
557 | * a new challenge is sent (unless the quiet timer forbids | |
558 | * this); if no exchange is in progress, one is commenced. | |
559 | */ | |
560 | ||
de014da6 | 561 | extern void kx_start(keyexch */*kx*/, int /*forcep*/); |
410c8acf | 562 | |
832a2ab6 | 563 | /* --- @kx_message@ --- * |
410c8acf | 564 | * |
565 | * Arguments: @keyexch *kx@ = pointer to key exchange context | |
832a2ab6 | 566 | * @unsigned msg@ = the message code |
567 | * @buf *b@ = pointer to buffer containing the packet | |
410c8acf | 568 | * |
569 | * Returns: --- | |
570 | * | |
832a2ab6 | 571 | * Use: Reads a packet containing key exchange messages and handles |
572 | * it. | |
410c8acf | 573 | */ |
574 | ||
832a2ab6 | 575 | extern void kx_message(keyexch */*kx*/, unsigned /*msg*/, buf */*b*/); |
410c8acf | 576 | |
577 | /* --- @kx_free@ --- * | |
578 | * | |
579 | * Arguments: @keyexch *kx@ = pointer to key exchange context | |
580 | * | |
581 | * Returns: --- | |
582 | * | |
583 | * Use: Frees everything in a key exchange context. | |
584 | */ | |
585 | ||
586 | extern void kx_free(keyexch */*kx*/); | |
587 | ||
588 | /* --- @kx_newkeys@ --- * | |
589 | * | |
590 | * Arguments: @keyexch *kx@ = pointer to key exchange context | |
591 | * | |
592 | * Returns: --- | |
593 | * | |
594 | * Use: Informs the key exchange module that its keys may have | |
595 | * changed. If fetching the new keys fails, the peer will be | |
596 | * destroyed, we log messages and struggle along with the old | |
597 | * keys. | |
598 | */ | |
599 | ||
600 | extern void kx_newkeys(keyexch */*kx*/); | |
601 | ||
602 | /* --- @kx_init@ --- * | |
603 | * | |
604 | * Arguments: @keyexch *kx@ = pointer to key exchange context | |
605 | * @peer *p@ = pointer to peer context | |
606 | * @keyset **ks@ = pointer to keyset list | |
010e6f63 | 607 | * @unsigned f@ = various useful flags |
410c8acf | 608 | * |
609 | * Returns: Zero if OK, nonzero if it failed. | |
610 | * | |
611 | * Use: Initializes a key exchange module. The module currently | |
612 | * contains no keys, and will attempt to initiate a key | |
613 | * exchange. | |
614 | */ | |
615 | ||
010e6f63 MW |
616 | extern int kx_init(keyexch */*kx*/, peer */*p*/, |
617 | keyset **/*ks*/, unsigned /*f*/); | |
410c8acf | 618 | |
619 | /*----- Keysets and symmetric cryptography --------------------------------*/ | |
620 | ||
832a2ab6 | 621 | /* --- @ks_drop@ --- * |
622 | * | |
623 | * Arguments: @keyset *ks@ = pointer to a keyset | |
624 | * | |
625 | * Returns: --- | |
626 | * | |
627 | * Use: Decrements a keyset's reference counter. If the counter hits | |
628 | * zero, the keyset is freed. | |
629 | */ | |
630 | ||
631 | extern void ks_drop(keyset */*ks*/); | |
632 | ||
633 | /* --- @ks_gen@ --- * | |
634 | * | |
635 | * Arguments: @const void *k@ = pointer to key material | |
636 | * @size_t x, y, z@ = offsets into key material (see below) | |
9466fafa | 637 | * @peer *p@ = pointer to peer information |
832a2ab6 | 638 | * |
639 | * Returns: A pointer to the new keyset. | |
640 | * | |
641 | * Use: Derives a new keyset from the given key material. The | |
642 | * offsets @x@, @y@ and @z@ separate the key material into three | |
643 | * parts. Between the @k@ and @k + x@ is `my' contribution to | |
644 | * the key material; between @k + x@ and @k + y@ is `your' | |
645 | * contribution; and between @k + y@ and @k + z@ is a shared | |
646 | * value we made together. These are used to construct two | |
647 | * pairs of symmetric keys. Each pair consists of an encryption | |
648 | * key and a message authentication key. One pair is used for | |
649 | * outgoing messages, the other for incoming messages. | |
650 | * | |
651 | * The new key is marked so that it won't be selected for output | |
652 | * by @ksl_encrypt@. You can still encrypt data with it by | |
653 | * calling @ks_encrypt@ directly. | |
654 | */ | |
655 | ||
656 | extern keyset *ks_gen(const void */*k*/, | |
9466fafa | 657 | size_t /*x*/, size_t /*y*/, size_t /*z*/, |
658 | peer */*p*/); | |
832a2ab6 | 659 | |
660 | /* --- @ks_tregen@ --- * | |
661 | * | |
662 | * Arguments: @keyset *ks@ = pointer to a keyset | |
663 | * | |
664 | * Returns: The time at which moves ought to be made to replace this key. | |
665 | */ | |
666 | ||
667 | extern time_t ks_tregen(keyset */*ks*/); | |
668 | ||
669 | /* --- @ks_activate@ --- * | |
670 | * | |
671 | * Arguments: @keyset *ks@ = pointer to a keyset | |
672 | * | |
673 | * Returns: --- | |
674 | * | |
675 | * Use: Activates a keyset, so that it can be used for encrypting | |
676 | * outgoing messages. | |
677 | */ | |
678 | ||
679 | extern void ks_activate(keyset */*ks*/); | |
680 | ||
681 | /* --- @ks_encrypt@ --- * | |
682 | * | |
683 | * Arguments: @keyset *ks@ = pointer to a keyset | |
7ed14135 | 684 | * @unsigned ty@ = message type |
832a2ab6 | 685 | * @buf *b@ = pointer to input buffer |
686 | * @buf *bb@ = pointer to output buffer | |
687 | * | |
688 | * Returns: Zero if OK, nonzero if the key needs replacing. If the | |
689 | * encryption failed, the output buffer is broken and zero is | |
690 | * returned. | |
691 | * | |
692 | * Use: Encrypts a block of data using the key. Note that the `key | |
693 | * ought to be replaced' notification is only ever given once | |
694 | * for each key. Also note that this call forces a keyset to be | |
695 | * used even if it's marked as not for data output. | |
696 | */ | |
697 | ||
7ed14135 | 698 | extern int ks_encrypt(keyset */*ks*/, unsigned /*ty*/, |
699 | buf */*b*/, buf */*bb*/); | |
832a2ab6 | 700 | |
701 | /* --- @ks_decrypt@ --- * | |
702 | * | |
703 | * Arguments: @keyset *ks@ = pointer to a keyset | |
7ed14135 | 704 | * @unsigned ty@ = expected type code |
832a2ab6 | 705 | * @buf *b@ = pointer to an input buffer |
706 | * @buf *bb@ = pointer to an output buffer | |
707 | * | |
708 | * Returns: Zero on success, or nonzero if there was some problem. | |
709 | * | |
710 | * Use: Attempts to decrypt a message using a given key. Note that | |
711 | * requesting decryption with a key directly won't clear a | |
712 | * marking that it's not for encryption. | |
713 | */ | |
714 | ||
7ed14135 | 715 | extern int ks_decrypt(keyset */*ks*/, unsigned /*ty*/, |
716 | buf */*b*/, buf */*bb*/); | |
832a2ab6 | 717 | |
718 | /* --- @ksl_free@ --- * | |
410c8acf | 719 | * |
720 | * Arguments: @keyset **ksroot@ = pointer to keyset list head | |
721 | * | |
722 | * Returns: --- | |
723 | * | |
832a2ab6 | 724 | * Use: Frees (releases references to) all of the keys in a keyset. |
410c8acf | 725 | */ |
726 | ||
832a2ab6 | 727 | extern void ksl_free(keyset **/*ksroot*/); |
410c8acf | 728 | |
832a2ab6 | 729 | /* --- @ksl_link@ --- * |
410c8acf | 730 | * |
731 | * Arguments: @keyset **ksroot@ = pointer to keyset list head | |
832a2ab6 | 732 | * @keyset *ks@ = pointer to a keyset |
410c8acf | 733 | * |
734 | * Returns: --- | |
735 | * | |
832a2ab6 | 736 | * Use: Links a keyset into a list. A keyset can only be on one list |
737 | * at a time. Bad things happen otherwise. | |
410c8acf | 738 | */ |
739 | ||
832a2ab6 | 740 | extern void ksl_link(keyset **/*ksroot*/, keyset */*ks*/); |
410c8acf | 741 | |
832a2ab6 | 742 | /* --- @ksl_prune@ --- * |
410c8acf | 743 | * |
744 | * Arguments: @keyset **ksroot@ = pointer to keyset list head | |
410c8acf | 745 | * |
832a2ab6 | 746 | * Returns: --- |
410c8acf | 747 | * |
832a2ab6 | 748 | * Use: Prunes the keyset list by removing keys which mustn't be used |
749 | * any more. | |
410c8acf | 750 | */ |
751 | ||
832a2ab6 | 752 | extern void ksl_prune(keyset **/*ksroot*/); |
410c8acf | 753 | |
832a2ab6 | 754 | /* --- @ksl_encrypt@ --- * |
410c8acf | 755 | * |
756 | * Arguments: @keyset **ksroot@ = pointer to keyset list head | |
7ed14135 | 757 | * @unsigned ty@ = message type |
410c8acf | 758 | * @buf *b@ = pointer to input buffer |
759 | * @buf *bb@ = pointer to output buffer | |
760 | * | |
761 | * Returns: Nonzero if a new key is needed. | |
762 | * | |
763 | * Use: Encrypts a packet. | |
764 | */ | |
765 | ||
7ed14135 | 766 | extern int ksl_encrypt(keyset **/*ksroot*/, unsigned /*ty*/, |
767 | buf */*b*/, buf */*bb*/); | |
410c8acf | 768 | |
832a2ab6 | 769 | /* --- @ksl_decrypt@ --- * |
410c8acf | 770 | * |
771 | * Arguments: @keyset **ksroot@ = pointer to keyset list head | |
7ed14135 | 772 | * @unsigned ty@ = expected type code |
410c8acf | 773 | * @buf *b@ = pointer to input buffer |
774 | * @buf *bb@ = pointer to output buffer | |
775 | * | |
776 | * Returns: Nonzero if the packet couldn't be decrypted. | |
777 | * | |
778 | * Use: Decrypts a packet. | |
779 | */ | |
780 | ||
7ed14135 | 781 | extern int ksl_decrypt(keyset **/*ksroot*/, unsigned /*ty*/, |
782 | buf */*b*/, buf */*bb*/); | |
410c8acf | 783 | |
37941236 | 784 | /*----- Challenges --------------------------------------------------------*/ |
785 | ||
786 | /* --- @c_new@ --- * | |
787 | * | |
788 | * Arguments: @buf *b@ = where to put the challenge | |
789 | * | |
790 | * Returns: Zero if OK, nonzero on error. | |
791 | * | |
792 | * Use: Issues a new challenge. | |
793 | */ | |
794 | ||
795 | extern int c_new(buf */*b*/); | |
796 | ||
797 | /* --- @c_check@ --- * | |
798 | * | |
799 | * Arguments: @buf *b@ = where to find the challenge | |
800 | * | |
801 | * Returns: Zero if OK, nonzero if it didn't work. | |
802 | * | |
803 | * Use: Checks a challenge. On failure, the buffer is broken. | |
804 | */ | |
805 | ||
806 | extern int c_check(buf */*b*/); | |
807 | ||
410c8acf | 808 | /*----- Administration interface ------------------------------------------*/ |
809 | ||
f43df819 MW |
810 | #define A_END ((char *)0) |
811 | ||
410c8acf | 812 | /* --- @a_warn@ --- * |
813 | * | |
814 | * Arguments: @const char *fmt@ = pointer to format string | |
815 | * @...@ = other arguments | |
816 | * | |
817 | * Returns: --- | |
818 | * | |
819 | * Use: Informs all admin connections of a warning. | |
820 | */ | |
821 | ||
822 | extern void a_warn(const char */*fmt*/, ...); | |
823 | ||
3cdc3f3a | 824 | /* --- @a_notify@ --- * |
825 | * | |
826 | * Arguments: @const char *fmt@ = pointer to format string | |
827 | * @...@ = other arguments | |
828 | * | |
829 | * Returns: --- | |
830 | * | |
831 | * Use: Sends a notification to interested admin connections. | |
832 | */ | |
833 | ||
834 | extern void a_notify(const char */*fmt*/, ...); | |
835 | ||
410c8acf | 836 | /* --- @a_create@ --- * |
837 | * | |
838 | * Arguments: @int fd_in, fd_out@ = file descriptors to use | |
3cdc3f3a | 839 | * @unsigned f@ = initial flags to set |
410c8acf | 840 | * |
841 | * Returns: --- | |
842 | * | |
843 | * Use: Creates a new admin connection. | |
844 | */ | |
845 | ||
3cdc3f3a | 846 | extern void a_create(int /*fd_in*/, int /*fd_out*/, unsigned /*f*/); |
410c8acf | 847 | |
848 | /* --- @a_quit@ --- * | |
849 | * | |
850 | * Arguments: --- | |
851 | * | |
852 | * Returns: --- | |
853 | * | |
854 | * Use: Shuts things down nicely. | |
855 | */ | |
856 | ||
857 | extern void a_quit(void); | |
858 | ||
c511e1f9 MW |
859 | /* --- @a_preselect@ --- * |
860 | * | |
861 | * Arguments: --- | |
862 | * | |
863 | * Returns: --- | |
864 | * | |
865 | * Use: Informs the admin module that we're about to select again, | |
866 | * and that it should do cleanup things it has delayed until a | |
867 | * `safe' time. | |
868 | */ | |
869 | ||
870 | extern void a_preselect(void); | |
871 | ||
410c8acf | 872 | /* --- @a_daemon@ --- * |
873 | * | |
874 | * Arguments: --- | |
875 | * | |
876 | * Returns: --- | |
877 | * | |
878 | * Use: Informs the admin module that it's a daemon. | |
879 | */ | |
880 | ||
881 | extern void a_daemon(void); | |
882 | ||
883 | /* --- @a_init@ --- * | |
884 | * | |
885 | * Arguments: @const char *sock@ = socket name to create | |
886 | * | |
887 | * Returns: --- | |
888 | * | |
889 | * Use: Creates the admin listening socket. | |
890 | */ | |
891 | ||
892 | extern void a_init(const char */*sock*/); | |
893 | ||
c8e02c8a MW |
894 | /*----- Mapping with addresses as keys ------------------------------------*/ |
895 | ||
896 | /* --- @am_create@ --- * | |
897 | * | |
898 | * Arguments: @addrmap *m@ = pointer to map | |
899 | * | |
900 | * Returns: --- | |
901 | * | |
902 | * Use: Create an address map, properly set up. | |
903 | */ | |
904 | ||
905 | extern void am_create(addrmap */*m*/); | |
906 | ||
907 | /* --- @am_destroy@ --- * | |
908 | * | |
909 | * Arguments: @addrmap *m@ = pointer to map | |
910 | * | |
911 | * Returns: --- | |
912 | * | |
913 | * Use: Destroy an address map, throwing away all the entries. | |
914 | */ | |
915 | ||
916 | extern void am_destroy(addrmap */*m*/); | |
917 | ||
918 | /* --- @am_find@ --- * | |
919 | * | |
920 | * Arguments: @addrmap *m@ = pointer to map | |
921 | * @const addr *a@ = address to look up | |
922 | * @size_t sz@ = size of block to allocate | |
923 | * @unsigned *f@ = where to store flags | |
924 | * | |
925 | * Returns: Pointer to found item, or null. | |
926 | * | |
927 | * Use: Finds a record with the given IP address, set @*f@ nonzero | |
928 | * and returns it. If @sz@ is zero, and no match was found, | |
929 | * return null; otherwise allocate a new block of @sz@ bytes, | |
930 | * clear @*f@ to zero and return the block pointer. | |
931 | */ | |
932 | ||
933 | extern void *am_find(addrmap */*m*/, const addr */*a*/, | |
934 | size_t /*sz*/, unsigned */*f*/); | |
935 | ||
936 | /* --- @am_remove@ --- * | |
937 | * | |
938 | * Arguments: @addrmap *m@ = pointer to map | |
939 | * @void *i@ = pointer to the item | |
940 | * | |
941 | * Returns: --- | |
942 | * | |
943 | * Use: Removes an item from the map. | |
944 | */ | |
945 | ||
946 | extern void am_remove(addrmap */*m*/, void */*i*/); | |
947 | ||
410c8acf | 948 | /*----- Peer management ---------------------------------------------------*/ |
949 | ||
950 | /* --- @p_txstart@ --- * | |
951 | * | |
952 | * Arguments: @peer *p@ = pointer to peer block | |
953 | * @unsigned msg@ = message type code | |
954 | * | |
955 | * Returns: A pointer to a buffer to write to. | |
956 | * | |
957 | * Use: Starts sending to a peer. Only one send can happen at a | |
958 | * time. | |
959 | */ | |
960 | ||
961 | extern buf *p_txstart(peer */*p*/, unsigned /*msg*/); | |
962 | ||
963 | /* --- @p_txend@ --- * | |
964 | * | |
965 | * Arguments: @peer *p@ = pointer to peer block | |
966 | * | |
967 | * Returns: --- | |
968 | * | |
969 | * Use: Sends a packet to the peer. | |
970 | */ | |
971 | ||
972 | extern void p_txend(peer */*p*/); | |
973 | ||
0ba8de86 | 974 | /* --- @p_pingsend@ --- * |
975 | * | |
976 | * Arguments: @peer *p@ = destination peer | |
977 | * @ping *pg@ = structure to fill in | |
978 | * @unsigned type@ = message type | |
979 | * @unsigned long timeout@ = how long to wait before giving up | |
980 | * @void (*func)(int, void *)@ = callback function | |
981 | * @void *arg@ = argument for callback | |
982 | * | |
983 | * Returns: Zero if successful, nonzero if it failed. | |
984 | * | |
985 | * Use: Sends a ping to a peer. Call @func@ with a nonzero argument | |
986 | * if we get an answer within the timeout, or zero if no answer. | |
987 | */ | |
988 | ||
989 | extern int p_pingsend(peer */*p*/, ping */*pg*/, unsigned /*type*/, | |
990 | unsigned long /*timeout*/, | |
991 | void (*/*func*/)(int, void *), void */*arg*/); | |
992 | ||
993 | /* --- @p_pingdone@ --- * | |
994 | * | |
995 | * Arguments: @ping *p@ = ping structure | |
996 | * @int rc@ = return code to pass on | |
997 | * | |
998 | * Returns: --- | |
999 | * | |
1000 | * Use: Disposes of a ping structure, maybe sending a notification. | |
1001 | */ | |
1002 | ||
1003 | extern void p_pingdone(ping */*p*/, int /*rc*/); | |
1004 | ||
37941236 | 1005 | /* --- @p_greet@ --- * |
1006 | * | |
1007 | * Arguments: @peer *p@ = peer to send to | |
1008 | * @const void *c@ = pointer to challenge | |
1009 | * @size_t sz@ = size of challenge | |
1010 | * | |
1011 | * Returns: --- | |
1012 | * | |
1013 | * Use: Sends a greeting packet. | |
1014 | */ | |
1015 | ||
1016 | extern void p_greet(peer */*p*/, const void */*c*/, size_t /*sz*/); | |
1017 | ||
410c8acf | 1018 | /* --- @p_tun@ --- * |
1019 | * | |
1020 | * Arguments: @peer *p@ = pointer to peer block | |
1021 | * @buf *b@ = buffer containing incoming packet | |
1022 | * | |
1023 | * Returns: --- | |
1024 | * | |
1025 | * Use: Handles a packet which needs to be sent to a peer. | |
1026 | */ | |
1027 | ||
1028 | extern void p_tun(peer */*p*/, buf */*b*/); | |
1029 | ||
de014da6 | 1030 | /* --- @p_keyreload@ --- * |
1031 | * | |
1032 | * Arguments: --- | |
1033 | * | |
1034 | * Returns: --- | |
1035 | * | |
1036 | * Use: Forces a check of the daemon's keyring files. | |
1037 | */ | |
1038 | ||
1039 | extern void p_keyreload(void); | |
1040 | ||
410c8acf | 1041 | /* --- @p_interval@ --- * |
1042 | * | |
1043 | * Arguments: --- | |
1044 | * | |
1045 | * Returns: --- | |
1046 | * | |
1047 | * Use: Called periodically to do tidying. | |
1048 | */ | |
1049 | ||
1050 | extern void p_interval(void); | |
1051 | ||
832a2ab6 | 1052 | /* --- @p_stats@ --- * |
1053 | * | |
1054 | * Arguments: @peer *p@ = pointer to a peer block | |
1055 | * | |
1056 | * Returns: A pointer to the peer's statistics. | |
1057 | */ | |
1058 | ||
1059 | extern stats *p_stats(peer */*p*/); | |
1060 | ||
410c8acf | 1061 | /* --- @p_ifname@ --- * |
1062 | * | |
1063 | * Arguments: @peer *p@ = pointer to a peer block | |
1064 | * | |
1065 | * Returns: A pointer to the peer's interface name. | |
1066 | */ | |
1067 | ||
1068 | extern const char *p_ifname(peer */*p*/); | |
1069 | ||
64cf2223 MW |
1070 | /* --- @p_setifname@ --- * |
1071 | * | |
1072 | * Arguments: @peer *p@ = pointer to a peer block | |
1073 | * @const char *name@ = pointer to the new name | |
1074 | * | |
1075 | * Returns: --- | |
1076 | * | |
1077 | * Use: Changes the name held for a peer's interface. | |
1078 | */ | |
1079 | ||
1080 | extern void p_setifname(peer */*p*/, const char */*name*/); | |
1081 | ||
410c8acf | 1082 | /* --- @p_addr@ --- * |
1083 | * | |
1084 | * Arguments: @peer *p@ = pointer to a peer block | |
1085 | * | |
1086 | * Returns: A pointer to the peer's address. | |
1087 | */ | |
1088 | ||
1089 | extern const addr *p_addr(peer */*p*/); | |
1090 | ||
1091 | /* --- @p_init@ --- * | |
1092 | * | |
767b36e2 | 1093 | * Arguments: @struct in_addr addr@ = address to bind to |
1094 | * @unsigned port@ = port number to listen to | |
410c8acf | 1095 | * |
1096 | * Returns: --- | |
1097 | * | |
1098 | * Use: Initializes the peer system; creates the socket. | |
1099 | */ | |
1100 | ||
767b36e2 | 1101 | extern void p_init(struct in_addr /*addr*/, unsigned /*port*/); |
410c8acf | 1102 | |
1103 | /* --- @p_port@ --- * | |
1104 | * | |
1105 | * Arguments: --- | |
1106 | * | |
1107 | * Returns: Port number used for socket. | |
1108 | */ | |
1109 | ||
1110 | unsigned p_port(void); | |
1111 | ||
1112 | /* --- @p_create@ --- * | |
1113 | * | |
0ba8de86 | 1114 | * Arguments: @peerspec *spec@ = information about this peer |
410c8acf | 1115 | * |
1116 | * Returns: Pointer to the peer block, or null if it failed. | |
1117 | * | |
1118 | * Use: Creates a new named peer block. No peer is actually attached | |
1119 | * by this point. | |
1120 | */ | |
1121 | ||
0ba8de86 | 1122 | extern peer *p_create(peerspec */*spec*/); |
410c8acf | 1123 | |
1124 | /* --- @p_name@ --- * | |
1125 | * | |
1126 | * Arguments: @peer *p@ = pointer to a peer block | |
1127 | * | |
1128 | * Returns: A pointer to the peer's name. | |
060ca767 | 1129 | * |
1130 | * Use: Equivalent to @p_spec(p)->name@. | |
410c8acf | 1131 | */ |
1132 | ||
1133 | extern const char *p_name(peer */*p*/); | |
1134 | ||
060ca767 | 1135 | /* --- @p_spec@ --- * |
1136 | * | |
1137 | * Arguments: @peer *p@ = pointer to a peer block | |
1138 | * | |
1139 | * Returns: Pointer to the peer's specification | |
1140 | */ | |
1141 | ||
1142 | extern const peerspec *p_spec(peer */*p*/); | |
1143 | ||
c8e02c8a MW |
1144 | /* --- @p_findbyaddr@ --- * |
1145 | * | |
1146 | * Arguments: @const addr *a@ = address to look up | |
1147 | * | |
1148 | * Returns: Pointer to the peer block, or null if not found. | |
1149 | * | |
1150 | * Use: Finds a peer by address. | |
1151 | */ | |
1152 | ||
1153 | extern peer *p_findbyaddr(const addr */*a*/); | |
1154 | ||
410c8acf | 1155 | /* --- @p_find@ --- * |
1156 | * | |
1157 | * Arguments: @const char *name@ = name to look up | |
1158 | * | |
1159 | * Returns: Pointer to the peer block, or null if not found. | |
1160 | * | |
1161 | * Use: Finds a peer by name. | |
1162 | */ | |
1163 | ||
1164 | extern peer *p_find(const char */*name*/); | |
1165 | ||
1166 | /* --- @p_destroy@ --- * | |
1167 | * | |
1168 | * Arguments: @peer *p@ = pointer to a peer | |
1169 | * | |
1170 | * Returns: --- | |
1171 | * | |
1172 | * Use: Destroys a peer. | |
1173 | */ | |
1174 | ||
1175 | extern void p_destroy(peer */*p*/); | |
1176 | ||
c8e02c8a MW |
1177 | /* --- @FOREACH_PEER@ --- * |
1178 | * | |
1179 | * Arguments: @p@ = name to bind to each peer | |
1180 | * @stuff@ = thing to do for each item | |
1181 | * | |
1182 | * Use: Does something for each current peer. | |
1183 | */ | |
1184 | ||
1185 | #define FOREACH_PEER(p, stuff) do { \ | |
1186 | peer_iter i_; \ | |
1187 | peer *p; \ | |
1188 | for (p_mkiter(&i_); (p = p_next(&i_)) != 0; ) do stuff while (0); \ | |
1189 | } while (0) | |
1190 | ||
1191 | /* --- @p_mkiter@ --- * | |
1192 | * | |
1193 | * Arguments: @peer_iter *i@ = pointer to an iterator | |
1194 | * | |
1195 | * Returns: --- | |
1196 | * | |
1197 | * Use: Initializes the iterator. | |
1198 | */ | |
1199 | ||
1200 | extern void p_mkiter(peer_iter */*i*/); | |
1201 | ||
1202 | /* --- @p_next@ --- * | |
1203 | * | |
1204 | * Arguments: @peer_iter *i@ = pointer to an iterator | |
410c8acf | 1205 | * |
c8e02c8a | 1206 | * Returns: Next peer, or null if at the end. |
410c8acf | 1207 | * |
c8e02c8a | 1208 | * Use: Returns the next peer. |
410c8acf | 1209 | */ |
1210 | ||
c8e02c8a | 1211 | extern peer *p_next(peer_iter */*i*/); |
410c8acf | 1212 | |
42da2a58 | 1213 | /*----- Tunnel drivers ----------------------------------------------------*/ |
410c8acf | 1214 | |
42da2a58 | 1215 | #ifdef TUN_LINUX |
1216 | extern const tunnel_ops tun_linux; | |
1217 | #endif | |
410c8acf | 1218 | |
42da2a58 | 1219 | #ifdef TUN_UNET |
1220 | extern const tunnel_ops tun_unet; | |
1221 | #endif | |
410c8acf | 1222 | |
42da2a58 | 1223 | #ifdef TUN_BSD |
1224 | extern const tunnel_ops tun_bsd; | |
1225 | #endif | |
410c8acf | 1226 | |
42da2a58 | 1227 | extern const tunnel_ops tun_slip; |
410c8acf | 1228 | |
410c8acf | 1229 | /*----- Other handy utilities ---------------------------------------------*/ |
1230 | ||
1231 | /* --- @mpstr@ --- * | |
1232 | * | |
1233 | * Arguments: @mp *m@ = a multiprecision integer | |
1234 | * | |
1235 | * Returns: A pointer to the integer's textual representation. | |
1236 | * | |
1237 | * Use: Converts a multiprecision integer to a string. Corrupts | |
832a2ab6 | 1238 | * @buf_t@. |
410c8acf | 1239 | */ |
1240 | ||
1241 | extern const char *mpstr(mp */*m*/); | |
1242 | ||
52c03a2a | 1243 | /* --- @gestr@ --- * |
1244 | * | |
1245 | * Arguments: @group *g@ = a group | |
1246 | * @ge *x@ = a group element | |
1247 | * | |
1248 | * Returns: A pointer to the element's textual representation. | |
1249 | * | |
1250 | * Use: Converts a group element to a string. Corrupts | |
1251 | * @buf_t@. | |
1252 | */ | |
1253 | ||
1254 | extern const char *gestr(group */*g*/, ge */*x*/); | |
1255 | ||
832a2ab6 | 1256 | /* --- @timestr@ --- * |
1257 | * | |
1258 | * Arguments: @time_t t@ = a time to convert | |
1259 | * | |
1260 | * Returns: A pointer to a textual representation of the time. | |
1261 | * | |
1262 | * Use: Converts a time to a textual representation. Corrupts | |
1263 | * @buf_t@. | |
1264 | */ | |
1265 | ||
1266 | extern const char *timestr(time_t /*t*/); | |
1267 | ||
42da2a58 | 1268 | /* --- @mystrieq@ --- * |
1269 | * | |
1270 | * Arguments: @const char *x, *y@ = two strings | |
1271 | * | |
1272 | * Returns: True if @x@ and @y are equal, up to case. | |
1273 | */ | |
1274 | ||
1275 | extern int mystrieq(const char */*x*/, const char */*y*/); | |
1276 | ||
37941236 | 1277 | /* --- @seq_reset@ --- * |
1278 | * | |
1279 | * Arguments: @seqwin *s@ = sequence-checking window | |
1280 | * | |
1281 | * Returns: --- | |
1282 | * | |
1283 | * Use: Resets a sequence number window. | |
1284 | */ | |
1285 | ||
1286 | extern void seq_reset(seqwin */*s*/); | |
1287 | ||
1288 | /* --- @seq_check@ --- * | |
1289 | * | |
1290 | * Arguments: @seqwin *s@ = sequence-checking window | |
1291 | * @uint32 q@ = sequence number to check | |
f43df819 | 1292 | * @const char *service@ = service to report message from |
37941236 | 1293 | * |
1294 | * Returns: A @SEQ_@ code. | |
1295 | * | |
1296 | * Use: Checks a sequence number against the window, updating things | |
1297 | * as necessary. | |
1298 | */ | |
1299 | ||
f43df819 | 1300 | extern int seq_check(seqwin */*s*/, uint32 /*q*/, const char */*service*/); |
37941236 | 1301 | |
410c8acf | 1302 | /*----- That's all, folks -------------------------------------------------*/ |
1303 | ||
1304 | #ifdef __cplusplus | |
1305 | } | |
1306 | #endif | |
1307 | ||
1308 | #endif |