Commit | Line | Data |
---|---|---|
410c8acf | 1 | /* -*-c-*- |
410c8acf | 2 | * |
3 | * Communication with the peer | |
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 | /*----- Header files ------------------------------------------------------*/ |
28 | ||
29 | #include "tripe.h" | |
30 | ||
31 | /*----- Static variables --------------------------------------------------*/ | |
32 | ||
c8e02c8a MW |
33 | static sym_table byname; |
34 | static addrmap byaddr; | |
410c8acf | 35 | static sel_file sock; |
6411163d | 36 | static unsigned nmobile; |
410c8acf | 37 | |
42da2a58 | 38 | /*----- Tunnel table ------------------------------------------------------*/ |
39 | ||
40 | const tunnel_ops *tunnels[] = { | |
41 | #ifdef TUN_LINUX | |
42 | &tun_linux, | |
43 | #endif | |
44 | #ifdef TUN_BSD | |
45 | &tun_bsd, | |
46 | #endif | |
47 | #ifdef TUN_UNET | |
48 | &tun_unet, | |
49 | #endif | |
50 | &tun_slip, | |
51 | 0 | |
52 | }, *tun_default; | |
53 | ||
410c8acf | 54 | /*----- Main code ---------------------------------------------------------*/ |
55 | ||
0ba8de86 | 56 | /* --- @p_pingtype@ --- * |
57 | * | |
58 | * Arguments: @unsigned msg@ = message type | |
59 | * | |
60 | * Returns: String to describe the message. | |
61 | */ | |
62 | ||
63 | static const char *p_pingtype(unsigned msg) | |
64 | { | |
65 | switch (msg & MSG_TYPEMASK) { | |
66 | case MISC_PING: | |
67 | case MISC_PONG: | |
68 | return "transport-ping"; | |
69 | case MISC_EPING: | |
70 | case MISC_EPONG: | |
71 | return "encrypted-ping"; | |
72 | default: | |
73 | abort(); | |
74 | } | |
75 | } | |
76 | ||
77 | /* --- @p_ponged@ --- * | |
78 | * | |
79 | * Arguments: @peer *p@ = peer packet arrived from | |
80 | * @unsigned msg@ = message type | |
81 | * @buf *b@ = buffer containing payload | |
82 | * | |
83 | * Returns: --- | |
84 | * | |
85 | * Use: Processes a ping response. | |
86 | */ | |
87 | ||
88 | static void p_ponged(peer *p, unsigned msg, buf *b) | |
89 | { | |
90 | uint32 id; | |
91 | const octet *magic; | |
92 | ping *pg; | |
e04c2d50 | 93 | |
0ba8de86 | 94 | IF_TRACING(T_PEER, { |
95 | trace(T_PEER, "peer: received %s reply from %s", | |
96 | p_pingtype(msg), p->spec.name); | |
97 | trace_block(T_PACKET, "peer: ping contents", BBASE(b), BSZ(b)); | |
98 | }) | |
99 | ||
100 | if (buf_getu32(b, &id) || | |
101 | (magic = buf_get(b, sizeof(pg->magic))) == 0 || | |
102 | BLEFT(b)) { | |
f43df819 | 103 | a_warn("PEER", "?PEER", p, "malformed-%s", p_pingtype(msg), A_END); |
0ba8de86 | 104 | return; |
105 | } | |
106 | ||
107 | for (pg = p->pings; pg; pg = pg->next) { | |
108 | if (pg->id == id) | |
109 | goto found; | |
110 | } | |
f43df819 MW |
111 | a_warn("PEER", |
112 | "?PEER", p, | |
113 | "unexpected-%s", p_pingtype(msg), | |
114 | "0x%08lx", (unsigned long)id, | |
115 | A_END); | |
0ba8de86 | 116 | return; |
117 | ||
118 | found: | |
119 | if (memcmp(magic, pg->magic, sizeof(pg->magic)) != 0) { | |
f43df819 | 120 | a_warn("PEER", "?PEER", p, "corrupt-%s", p_pingtype(msg), A_END); |
0ba8de86 | 121 | return; |
122 | } | |
123 | p_pingdone(pg, PING_OK); | |
124 | } | |
125 | ||
6411163d MW |
126 | /* --- @p_rxupdstats@ --- * |
127 | * | |
128 | * Arguments: @peer *p@ = peer to update | |
129 | * @size_t n@ = size of incoming packet | |
130 | * | |
131 | * Returns: --- | |
132 | * | |
133 | * Use: Updates the peer's incoming packet statistics. | |
134 | */ | |
135 | ||
136 | static void p_rxupdstats(peer *p, size_t n) | |
137 | { | |
138 | p->st.t_last = time(0); | |
139 | p->st.n_in++; | |
140 | p->st.sz_in += n; | |
141 | } | |
142 | ||
a50f9a0e MW |
143 | /* --- @p_encrypt@ --- * |
144 | * | |
145 | * Arguments: @peer *p@ = peer to encrypt message to | |
146 | * @int ty@ message type to send | |
147 | * @buf *bin, *bout@ = input and output buffers | |
148 | * | |
149 | * Returns: --- | |
150 | * | |
151 | * Use: Convenience function for packet encryption. Forces | |
152 | * renegotiation when necessary. Check for the output buffer | |
153 | * being broken to find out whether the encryption was | |
154 | * successful. | |
155 | */ | |
156 | ||
157 | static int p_encrypt(peer *p, int ty, buf *bin, buf *bout) | |
158 | { | |
159 | int err = ksl_encrypt(&p->ks, ty, bin, bout); | |
160 | ||
161 | if (err == KSERR_REGEN) { | |
162 | kx_start(&p->kx, 1); | |
163 | err = 0; | |
164 | } | |
165 | if (!BOK(bout)) | |
166 | err = -1; | |
167 | return (err); | |
168 | } | |
169 | ||
170 | /* --- @p_decrypt@ --- * | |
171 | * | |
6411163d MW |
172 | * Arguments: @peer **pp@ = pointer to peer to decrypt message from |
173 | * @addr *a@ = address the packet arrived on | |
174 | * @size_t n@ = size of original incoming packet | |
a50f9a0e MW |
175 | * @int ty@ = message type to expect |
176 | * @buf *bin, *bout@ = input and output buffers | |
177 | * | |
178 | * Returns: Zero on success; nonzero on error. | |
179 | * | |
180 | * Use: Convenience function for packet decryption. Reports errors | |
181 | * and updates statistics appropriately. | |
6411163d MW |
182 | * |
183 | * If @*pp@ is null on entry and there are mobile peers then we | |
184 | * see if any of them can decrypt the packet. If so, we record | |
185 | * @*a@ as the peer's new address and send a notification. | |
a50f9a0e MW |
186 | */ |
187 | ||
6411163d MW |
188 | static int p_decrypt(peer **pp, addr *a, size_t n, |
189 | int ty, buf *bin, buf *bout) | |
a50f9a0e | 190 | { |
6411163d MW |
191 | peer *p; |
192 | peer_byaddr *pa; | |
193 | int err = KSERR_DECRYPT; | |
194 | unsigned f; | |
195 | ||
196 | if (*pp) { | |
197 | p = *pp; | |
198 | T( trace(T_PEER, "peer: decrypting packet from known peer `%s'", | |
199 | p_name(p)); ) | |
200 | err = ksl_decrypt(&p->ks, ty, bin, bout); | |
201 | } else { | |
202 | p = 0; | |
203 | if (nmobile) { | |
204 | T( trace(T_PEER, "peer: unknown source: trying mobile peers..."); ) | |
205 | FOREACH_PEER(q, { | |
66196407 | 206 | if (!(q->spec.f & PSF_MOBILE)) continue; |
6411163d MW |
207 | if ((err = ksl_decrypt(&q->ks, ty, bin, bout)) == KSERR_DECRYPT) { |
208 | T( trace(T_PEER, "peer: peer `%s' failed to decrypt", | |
209 | p_name(q)); ) | |
210 | continue; | |
211 | } else { | |
212 | p = *pp = q; | |
213 | IF_TRACING(T_PEER, { | |
214 | if (!err) | |
215 | trace(T_PEER, "peer: peer `%s' reports success", p_name(p)); | |
216 | else { | |
217 | trace(T_PEER, "peer: peer `%s' reports decryption error %d", | |
218 | p_name(p), err); | |
219 | } | |
220 | }) | |
221 | break; | |
222 | } | |
223 | }); | |
224 | } | |
225 | if (!p) { | |
226 | a_warn("PEER", "-", "unexpected-source", "?ADDR", a, A_END); | |
227 | return (-1); | |
228 | } | |
229 | if (!err) { | |
230 | T( trace(T_PEER, "peer: updating address for `%s'", p_name(p)); ) | |
231 | p_rxupdstats(p, n); | |
232 | pa = am_find(&byaddr, a, sizeof(peer_byaddr), &f); assert(!f); | |
233 | am_remove(&byaddr, p->byaddr); | |
234 | p->byaddr = pa; | |
235 | pa->p = p; | |
236 | p->spec.sa = *a; | |
237 | a_notify("NEWADDR", "?PEER", p, "?ADDR", a, A_END); | |
238 | } | |
239 | } | |
240 | if (err) { | |
241 | if (p) p->st.n_reject++; | |
242 | a_warn("PEER", "?PEER", p, "decrypt-failed", | |
243 | "error-code", "%d", err, A_END); | |
a50f9a0e MW |
244 | return (-1); |
245 | } | |
246 | if (!BOK(bout)) | |
247 | return (-1); | |
248 | return (0); | |
249 | } | |
250 | ||
410c8acf | 251 | /* --- @p_read@ --- * |
252 | * | |
253 | * Arguments: @int fd@ = file descriptor to read from | |
254 | * @unsigned mode@ = what happened | |
255 | * @void *v@ = an uninteresting pointer | |
256 | * | |
257 | * Returns: --- | |
258 | * | |
259 | * Use: Reads a packet from somewhere. | |
260 | */ | |
261 | ||
262 | static void p_read(int fd, unsigned mode, void *v) | |
263 | { | |
37941236 | 264 | peer *p = 0; |
410c8acf | 265 | addr a; |
266 | size_t sz; | |
267 | ssize_t n; | |
268 | int ch; | |
269 | buf b, bb; | |
270 | ||
271 | /* --- Read the data --- */ | |
272 | ||
8d0c7a83 | 273 | TIMER; |
410c8acf | 274 | sz = sizeof(addr); |
275 | n = recvfrom(fd, buf_i, sizeof(buf_i), 0, &a.sa, &sz); | |
276 | if (n < 0) { | |
f43df819 | 277 | a_warn("PEER", "-", "socket-read-error", "?ERRNO", A_END); |
410c8acf | 278 | return; |
279 | } | |
280 | ||
37941236 | 281 | /* --- If the packet is a greeting, don't check peers --- */ |
282 | ||
283 | if (n && buf_i[0] == (MSG_MISC | MISC_GREET)) { | |
284 | IF_TRACING(T_PEER, { | |
285 | trace(T_PEER, "peer: greeting received from INET %s %u", | |
286 | inet_ntoa(a.sin.sin_addr), | |
287 | (unsigned)ntohs(a.sin.sin_port)); | |
288 | trace_block(T_PACKET, "peer: greeting contents", buf_i, n); | |
289 | }) | |
290 | buf_init(&b, buf_i, n); | |
291 | buf_getbyte(&b); | |
292 | if (c_check(&b) || BLEFT(&b)) { | |
f43df819 | 293 | a_warn("PEER", "-", "invalid-greeting", A_END); |
37941236 | 294 | return; |
295 | } | |
f43df819 MW |
296 | a_notify("GREET", |
297 | "?B64", buf_i + 1, (size_t)(n - 1), | |
298 | "?ADDR", &a, | |
299 | A_END); | |
37941236 | 300 | return; |
301 | } | |
302 | ||
6411163d MW |
303 | /* --- Find the appropriate peer --- * |
304 | * | |
305 | * At this stage, don't worry too much about whether we actually found it. | |
306 | */ | |
410c8acf | 307 | |
6411163d | 308 | p = p_findbyaddr(&a); |
410c8acf | 309 | |
b9066fbb | 310 | IF_TRACING(T_PEER, { |
6411163d MW |
311 | if (p) { |
312 | trace(T_PEER, | |
313 | "peer: packet received from `%s' from address INET %s %d", | |
314 | p_name(p), inet_ntoa(a.sin.sin_addr), ntohs(a.sin.sin_port)); | |
315 | } else { | |
316 | trace(T_PEER, "peer: packet received from unknown address INET %s %d", | |
317 | inet_ntoa(a.sin.sin_addr), ntohs(a.sin.sin_port)); | |
318 | } | |
b9066fbb | 319 | trace_block(T_PACKET, "peer: packet contents", buf_i, n); |
320 | }) | |
410c8acf | 321 | |
322 | /* --- Pick the packet apart --- */ | |
323 | ||
6411163d | 324 | if (p) p_rxupdstats(p, n); |
410c8acf | 325 | buf_init(&b, buf_i, n); |
326 | if ((ch = buf_getbyte(&b)) < 0) { | |
f43df819 | 327 | a_warn("PEER", "?PEER", p, "bad-packet", "no-type", A_END); |
410c8acf | 328 | return; |
329 | } | |
5bb41301 | 330 | switch (ch & MSG_CATMASK) { |
410c8acf | 331 | case MSG_PACKET: |
5bb41301 | 332 | if (ch & MSG_TYPEMASK) { |
f43df819 MW |
333 | a_warn("PEER", |
334 | "?PEER", p, | |
335 | "bad-packet", | |
336 | "unknown-type", "0x%02x", ch, | |
337 | A_END); | |
6411163d | 338 | if (p) p->st.n_reject++; |
5bb41301 | 339 | return; |
340 | } | |
410c8acf | 341 | buf_init(&bb, buf_o, sizeof(buf_o)); |
6411163d | 342 | if (p_decrypt(&p, &a, n, MSG_PACKET, &b, &bb)) |
410c8acf | 343 | return; |
5bb41301 | 344 | if (BOK(&bb)) { |
345 | p->st.n_ipin++; | |
346 | p->st.sz_ipin += BSZ(&b); | |
42da2a58 | 347 | p->t->ops->inject(p->t, &bb); |
5bb41301 | 348 | } else { |
349 | p->st.n_reject++; | |
f43df819 | 350 | a_warn("PEER", "?PEER", p, "packet-build-failed", A_END); |
5bb41301 | 351 | } |
410c8acf | 352 | break; |
5bb41301 | 353 | case MSG_KEYEXCH: |
6411163d | 354 | if (!p) goto unexp; |
5bb41301 | 355 | kx_message(&p->kx, ch & MSG_TYPEMASK, &b); |
410c8acf | 356 | break; |
0ba8de86 | 357 | case MSG_MISC: |
358 | switch (ch & MSG_TYPEMASK) { | |
359 | case MISC_NOP: | |
6411163d | 360 | if (!p) goto unexp; |
0ba8de86 | 361 | T( trace(T_PEER, "peer: received NOP packet"); ) |
362 | break; | |
363 | case MISC_PING: | |
6411163d | 364 | if (!p) goto unexp; |
0ba8de86 | 365 | buf_put(p_txstart(p, MSG_MISC | MISC_PONG), BCUR(&b), BLEFT(&b)); |
366 | p_txend(p); | |
e04c2d50 | 367 | break; |
0ba8de86 | 368 | case MISC_PONG: |
6411163d | 369 | if (!p) goto unexp; |
0ba8de86 | 370 | p_ponged(p, MISC_PONG, &b); |
371 | break; | |
372 | case MISC_EPING: | |
373 | buf_init(&bb, buf_t, sizeof(buf_t)); | |
6411163d | 374 | if (p_decrypt(&p, &a, n, ch, &b, &bb)) |
0ba8de86 | 375 | return; |
0ba8de86 | 376 | if (BOK(&bb)) { |
377 | buf_flip(&bb); | |
a50f9a0e MW |
378 | p_encrypt(p, MSG_MISC | MISC_EPONG, &bb, |
379 | p_txstart(p, MSG_MISC | MISC_EPONG)); | |
0ba8de86 | 380 | p_txend(p); |
381 | } | |
382 | break; | |
383 | case MISC_EPONG: | |
384 | buf_init(&bb, buf_t, sizeof(buf_t)); | |
6411163d | 385 | if (p_decrypt(&p, &a, n, ch, &b, &bb)) |
0ba8de86 | 386 | return; |
0ba8de86 | 387 | if (BOK(&bb)) { |
388 | buf_flip(&bb); | |
389 | p_ponged(p, MISC_EPONG, &bb); | |
390 | } | |
391 | break; | |
392 | } | |
393 | break; | |
410c8acf | 394 | default: |
6411163d | 395 | if (p) p->st.n_reject++; |
f43df819 MW |
396 | a_warn("PEER", |
397 | "?PEER", p, | |
398 | "bad-packet", | |
a68280fc | 399 | "unknown-category", "0x%02x", ch, |
f43df819 | 400 | A_END); |
410c8acf | 401 | break; |
6411163d MW |
402 | unexp: |
403 | a_warn("PEER", "-", "unexpected-source", "?ADDR", &a, A_END); | |
404 | break; | |
410c8acf | 405 | } |
406 | } | |
407 | ||
408 | /* --- @p_txstart@ --- * | |
409 | * | |
410 | * Arguments: @peer *p@ = pointer to peer block | |
411 | * @unsigned msg@ = message type code | |
412 | * | |
413 | * Returns: A pointer to a buffer to write to. | |
414 | * | |
415 | * Use: Starts sending to a peer. Only one send can happen at a | |
416 | * time. | |
417 | */ | |
418 | ||
419 | buf *p_txstart(peer *p, unsigned msg) | |
420 | { | |
421 | buf_init(&p->b, buf_o, sizeof(buf_o)); | |
422 | buf_putbyte(&p->b, msg); | |
423 | return (&p->b); | |
424 | } | |
425 | ||
426 | /* --- @p_txend@ --- * | |
427 | * | |
428 | * Arguments: @peer *p@ = pointer to peer block | |
429 | * | |
430 | * Returns: --- | |
431 | * | |
432 | * Use: Sends a packet to the peer. | |
433 | */ | |
434 | ||
0ba8de86 | 435 | static void p_setkatimer(peer *); |
436 | ||
437 | static int p_dotxend(peer *p) | |
410c8acf | 438 | { |
439 | if (!BOK(&p->b)) { | |
f43df819 | 440 | a_warn("PEER", "?PEER", p, "packet-build-failed", A_END); |
0ba8de86 | 441 | return (0); |
410c8acf | 442 | } |
443 | IF_TRACING(T_PEER, trace_block(T_PACKET, "peer: sending packet", | |
444 | BBASE(&p->b), BLEN(&p->b)); ) | |
445 | if (sendto(sock.fd, BBASE(&p->b), BLEN(&p->b), | |
0ba8de86 | 446 | 0, &p->spec.sa.sa, p->spec.sasz) < 0) { |
f43df819 | 447 | a_warn("PEER", "?PEER", p, "socket-write-error", "?ERRNO", A_END); |
0ba8de86 | 448 | return (0); |
449 | } else { | |
5bb41301 | 450 | p->st.n_out++; |
451 | p->st.sz_out += BLEN(&p->b); | |
0ba8de86 | 452 | return (1); |
5bb41301 | 453 | } |
410c8acf | 454 | } |
455 | ||
0ba8de86 | 456 | void p_txend(peer *p) |
457 | { | |
458 | if (p_dotxend(p) && p->spec.t_ka) { | |
459 | sel_rmtimer(&p->tka); | |
460 | p_setkatimer(p); | |
461 | } | |
462 | } | |
463 | ||
464 | /* --- @p_pingwrite@ --- * | |
465 | * | |
466 | * Arguments: @ping *p@ = ping structure | |
467 | * @buf *b@ = buffer to write in | |
468 | * | |
469 | * Returns: --- | |
470 | * | |
471 | * Use: Fills in a ping structure and writes the packet payload. | |
472 | */ | |
473 | ||
474 | static void p_pingwrite(ping *p, buf *b) | |
475 | { | |
476 | static uint32 seq = 0; | |
477 | ||
478 | p->id = U32(seq++); | |
479 | GR_FILL(&rand_global, p->magic, sizeof(p->magic)); | |
480 | buf_putu32(b, p->id); | |
481 | buf_put(b, p->magic, sizeof(p->magic)); | |
482 | } | |
483 | ||
484 | /* --- @p_pingdone@ --- * | |
485 | * | |
486 | * Arguments: @ping *p@ = ping structure | |
487 | * @int rc@ = return code to pass on | |
488 | * | |
489 | * Returns: --- | |
490 | * | |
491 | * Use: Disposes of a ping structure, maybe sending a notification. | |
492 | */ | |
493 | ||
494 | void p_pingdone(ping *p, int rc) | |
495 | { | |
0ba8de86 | 496 | if (p->prev) p->prev->next = p->next; |
497 | else p->p->pings = p->next; | |
498 | if (p->next) p->next->prev = p->prev; | |
499 | if (rc != PING_TIMEOUT) sel_rmtimer(&p->t); | |
060ca767 | 500 | T( trace(T_PEER, "peer: ping 0x%08lx done (rc = %d)", |
501 | (unsigned long)p->id, rc); ) | |
0ba8de86 | 502 | if (rc >= 0) p->func(rc, p->arg); |
503 | } | |
504 | ||
505 | /* --- @p_pingtimeout@ --- * | |
506 | * | |
507 | * Arguments: @struct timeval *now@ = the time now | |
508 | * @void *pv@ = pointer to ping block | |
509 | * | |
510 | * Returns: --- | |
511 | * | |
512 | * Use: Called when a ping times out. | |
513 | */ | |
514 | ||
515 | static void p_pingtimeout(struct timeval *now, void *pv) | |
516 | { | |
517 | ping *p = pv; | |
518 | ||
519 | T( trace(T_PEER, "peer: ping 0x%08lx timed out", (unsigned long)p->id); ) | |
520 | p_pingdone(p, PING_TIMEOUT); | |
521 | } | |
522 | ||
523 | /* --- @p_pingsend@ --- * | |
524 | * | |
525 | * Arguments: @peer *p@ = destination peer | |
526 | * @ping *pg@ = structure to fill in | |
527 | * @unsigned type@ = message type | |
528 | * @unsigned long timeout@ = how long to wait before giving up | |
529 | * @void (*func)(int, void *)@ = callback function | |
530 | * @void *arg@ = argument for callback | |
531 | * | |
532 | * Returns: Zero if successful, nonzero if it failed. | |
533 | * | |
534 | * Use: Sends a ping to a peer. Call @func@ with a nonzero argument | |
535 | * if we get an answer within the timeout, or zero if no answer. | |
536 | */ | |
537 | ||
538 | int p_pingsend(peer *p, ping *pg, unsigned type, | |
539 | unsigned long timeout, | |
540 | void (*func)(int, void *), void *arg) | |
541 | { | |
542 | buf *b, bb; | |
543 | struct timeval tv; | |
544 | ||
0ba8de86 | 545 | switch (type) { |
546 | case MISC_PING: | |
547 | pg->msg = MISC_PONG; | |
548 | b = p_txstart(p, MSG_MISC | MISC_PING); | |
549 | p_pingwrite(pg, b); | |
550 | p_txend(p); | |
551 | break; | |
552 | case MISC_EPING: | |
553 | pg->msg = MISC_EPONG; | |
554 | b = p_txstart(p, MSG_MISC | MISC_EPING); | |
555 | buf_init(&bb, buf_t, sizeof(buf_t)); | |
556 | p_pingwrite(pg, &bb); | |
557 | buf_flip(&bb); | |
a50f9a0e | 558 | p_encrypt(p, MSG_MISC | MISC_EPING, &bb, b); |
0ba8de86 | 559 | if (!BOK(b)) |
560 | return (-1); | |
561 | p_txend(p); | |
562 | break; | |
563 | default: | |
564 | abort(); | |
565 | break; | |
566 | } | |
567 | ||
568 | pg->next = p->pings; | |
569 | pg->prev = 0; | |
570 | pg->p = p; | |
571 | pg->func = func; | |
572 | pg->arg = arg; | |
060ca767 | 573 | if (p->pings) p->pings->prev = pg; |
0ba8de86 | 574 | p->pings = pg; |
575 | gettimeofday(&tv, 0); | |
576 | tv.tv_sec += timeout; | |
577 | sel_addtimer(&sel, &pg->t, &tv, p_pingtimeout, pg); | |
578 | T( trace(T_PEER, "peer: send %s 0x%08lx to %s", | |
579 | p_pingtype(type), (unsigned long)pg->id, p->spec.name); ) | |
580 | return (0); | |
581 | } | |
582 | ||
37941236 | 583 | /* --- @p_greet@ --- * |
584 | * | |
585 | * Arguments: @peer *p@ = peer to send to | |
586 | * @const void *c@ = pointer to challenge | |
587 | * @size_t sz@ = size of challenge | |
588 | * | |
589 | * Returns: --- | |
590 | * | |
591 | * Use: Sends a greeting packet. | |
592 | */ | |
593 | ||
594 | void p_greet(peer *p, const void *c, size_t sz) | |
595 | { | |
596 | buf *b = p_txstart(p, MSG_MISC | MISC_GREET); | |
597 | buf_put(b, c, sz); | |
598 | p_txend(p); | |
599 | } | |
600 | ||
410c8acf | 601 | /* --- @p_tun@ --- * |
602 | * | |
603 | * Arguments: @peer *p@ = pointer to peer block | |
604 | * @buf *b@ = buffer containing incoming packet | |
605 | * | |
606 | * Returns: --- | |
607 | * | |
608 | * Use: Handles a packet which needs to be sent to a peer. | |
609 | */ | |
610 | ||
611 | void p_tun(peer *p, buf *b) | |
612 | { | |
613 | buf *bb = p_txstart(p, MSG_PACKET); | |
7b052fe6 | 614 | |
8d0c7a83 | 615 | TIMER; |
a50f9a0e | 616 | p_encrypt(p, MSG_PACKET, b, bb); |
5bb41301 | 617 | if (BOK(bb) && BLEN(bb)) { |
618 | p->st.n_ipout++; | |
619 | p->st.sz_ipout += BLEN(bb); | |
410c8acf | 620 | p_txend(p); |
5bb41301 | 621 | } |
410c8acf | 622 | } |
623 | ||
de014da6 | 624 | /* --- @p_keyreload@ --- * |
625 | * | |
626 | * Arguments: --- | |
627 | * | |
628 | * Returns: --- | |
629 | * | |
630 | * Use: Forces a check of the daemon's keyring files. | |
631 | */ | |
632 | ||
633 | void p_keyreload(void) | |
634 | { | |
c8e02c8a MW |
635 | if (km_reload()) |
636 | FOREACH_PEER(p, { kx_newkeys(&p->kx); }); | |
de014da6 | 637 | } |
638 | ||
410c8acf | 639 | /* --- @p_interval@ --- * |
640 | * | |
641 | * Arguments: --- | |
642 | * | |
643 | * Returns: --- | |
644 | * | |
645 | * Use: Called periodically to do tidying. | |
646 | */ | |
647 | ||
648 | void p_interval(void) | |
649 | { | |
de014da6 | 650 | p_keyreload(); |
c8e02c8a | 651 | FOREACH_PEER(p, { ksl_prune(&p->ks); }); |
410c8acf | 652 | } |
653 | ||
5bb41301 | 654 | /* --- @p_stats@ --- * |
655 | * | |
656 | * Arguments: @peer *p@ = pointer to a peer block | |
657 | * | |
658 | * Returns: A pointer to the peer's statistics. | |
659 | */ | |
660 | ||
661 | stats *p_stats(peer *p) { return (&p->st); } | |
662 | ||
410c8acf | 663 | /* --- @p_ifname@ --- * |
664 | * | |
665 | * Arguments: @peer *p@ = pointer to a peer block | |
666 | * | |
667 | * Returns: A pointer to the peer's interface name. | |
668 | */ | |
669 | ||
64cf2223 MW |
670 | const char *p_ifname(peer *p) { return (p->ifname); } |
671 | ||
672 | /* --- @p_setifname@ --- * | |
673 | * | |
674 | * Arguments: @peer *p@ = pointer to a peer block | |
675 | * @const char *name@ = pointer to the new name | |
676 | * | |
677 | * Returns: --- | |
678 | * | |
679 | * Use: Changes the name held for a peer's interface. | |
680 | */ | |
681 | ||
682 | void p_setifname(peer *p, const char *name) | |
72917fe7 MW |
683 | { |
684 | xfree(p->ifname); | |
685 | p->ifname = xstrdup(name); | |
686 | if (p->spec.tops->setifname) | |
687 | p->spec.tops->setifname(p->t, name); | |
688 | } | |
410c8acf | 689 | |
690 | /* --- @p_addr@ --- * | |
691 | * | |
692 | * Arguments: @peer *p@ = pointer to a peer block | |
693 | * | |
694 | * Returns: A pointer to the peer's address. | |
695 | */ | |
696 | ||
0ba8de86 | 697 | const addr *p_addr(peer *p) { return (&p->spec.sa); } |
410c8acf | 698 | |
699 | /* --- @p_init@ --- * | |
700 | * | |
767b36e2 | 701 | * Arguments: @struct in_addr addr@ = address to bind to |
702 | * @unsigned port@ = port number to listen to | |
410c8acf | 703 | * |
704 | * Returns: --- | |
705 | * | |
706 | * Use: Initializes the peer system; creates the socket. | |
707 | */ | |
708 | ||
767b36e2 | 709 | void p_init(struct in_addr addr, unsigned port) |
410c8acf | 710 | { |
711 | int fd; | |
712 | struct sockaddr_in sin; | |
df9dfccf | 713 | int len = PKBUFSZ; |
0a9920e2 | 714 | |
715 | /* --- Note on socket buffer sizes --- * | |
716 | * | |
717 | * For some bizarre reason, Linux 2.2 (at least) doubles the socket buffer | |
718 | * sizes I pass to @setsockopt@. I'm not putting special-case code here | |
719 | * for Linux: BSD (at least TCPv2) does what I tell it rather than second- | |
720 | * guessing me. | |
721 | */ | |
410c8acf | 722 | |
723 | if ((fd = socket(PF_INET, SOCK_DGRAM, 0)) < 0) | |
724 | die(EXIT_FAILURE, "socket creation failed: %s", strerror(errno)); | |
725 | BURN(sin); | |
726 | sin.sin_family = AF_INET; | |
767b36e2 | 727 | sin.sin_addr = addr; |
410c8acf | 728 | sin.sin_port = htons(port); |
729 | if (bind(fd, (struct sockaddr *)&sin, sizeof(sin))) | |
730 | die(EXIT_FAILURE, "bind failed: %s", strerror(errno)); | |
0a9920e2 | 731 | if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, sizeof(len)) || |
732 | setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &len, sizeof(len))) { | |
733 | die(EXIT_FAILURE, "failed to set socket buffer sizes: %s", | |
734 | strerror(errno)); | |
735 | } | |
650a6624 | 736 | fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC); |
410c8acf | 737 | sel_initfile(&sel, &sock, fd, SEL_READ, p_read, 0); |
738 | sel_addfile(&sock); | |
739 | T( trace(T_PEER, "peer: created socket"); ) | |
c8e02c8a MW |
740 | |
741 | sym_create(&byname); | |
742 | am_create(&byaddr); | |
410c8acf | 743 | } |
744 | ||
745 | /* --- @p_port@ --- * | |
746 | * | |
747 | * Arguments: --- | |
748 | * | |
749 | * Returns: Port number used for socket. | |
750 | */ | |
751 | ||
752 | unsigned p_port(void) | |
753 | { | |
754 | addr a; | |
755 | size_t sz = sizeof(addr); | |
756 | ||
757 | if (getsockname(sock.fd, &a.sa, &sz)) | |
758 | die(EXIT_FAILURE, "couldn't read port number: %s", strerror(errno)); | |
759 | assert(a.sa.sa_family == AF_INET); | |
760 | return (ntohs(a.sin.sin_port)); | |
761 | } | |
762 | ||
0ba8de86 | 763 | /* --- @p_keepalive@ --- * |
764 | * | |
765 | * Arguments: @struct timeval *now@ = the current time | |
766 | * @void *pv@ = peer to wake up | |
767 | * | |
768 | * Returns: --- | |
769 | * | |
770 | * Use: Sends a keepalive ping message to its peer. | |
771 | */ | |
772 | ||
773 | static void p_keepalive(struct timeval *now, void *pv) | |
774 | { | |
775 | peer *p = pv; | |
776 | p_txstart(p, MSG_MISC | MISC_NOP); p_dotxend(p); | |
777 | T( trace(T_PEER, "peer: sent keepalive to %s", p->spec.name); ) | |
778 | p_setkatimer(p); | |
779 | } | |
780 | ||
781 | /* --- @p_setkatimer@ --- * | |
782 | * | |
783 | * Arguments: @peer *p@ = peer to set | |
784 | * | |
785 | * Returns: --- | |
786 | * | |
787 | * Use: Resets the keepalive timer thing. | |
788 | */ | |
789 | ||
790 | static void p_setkatimer(peer *p) | |
791 | { | |
792 | struct timeval tv; | |
793 | ||
794 | if (!p->spec.t_ka) | |
795 | return; | |
796 | gettimeofday(&tv, 0); | |
797 | tv.tv_sec += p->spec.t_ka; | |
798 | sel_addtimer(&sel, &p->tka, &tv, p_keepalive, p); | |
799 | } | |
800 | ||
410c8acf | 801 | /* --- @p_create@ --- * |
802 | * | |
0ba8de86 | 803 | * Arguments: @peerspec *spec@ = information about this peer |
410c8acf | 804 | * |
805 | * Returns: Pointer to the peer block, or null if it failed. | |
806 | * | |
807 | * Use: Creates a new named peer block. No peer is actually attached | |
808 | * by this point. | |
809 | */ | |
810 | ||
0ba8de86 | 811 | peer *p_create(peerspec *spec) |
410c8acf | 812 | { |
813 | peer *p = CREATE(peer); | |
eb5f3fea MW |
814 | const tunnel_ops *tops = spec->tops; |
815 | int fd; | |
c8e02c8a MW |
816 | unsigned f; |
817 | ||
818 | p->byname = sym_find(&byname, spec->name, -1, sizeof(peer_byname), &f); | |
819 | if (f) goto tidy_0; | |
820 | p->byaddr = am_find(&byaddr, &spec->sa, sizeof(peer_byaddr), &f); | |
821 | if (f) goto tidy_1; | |
822 | p->byname->p = p->byaddr->p = p; | |
42da2a58 | 823 | |
0ba8de86 | 824 | T( trace(T_PEER, "peer: creating new peer `%s'", spec->name); ) |
825 | p->spec = *spec; | |
c8e02c8a | 826 | p->spec.name = (/*unconst*/ char *)SYM_NAME(p->byname); |
48b84569 MW |
827 | if (spec->tag) |
828 | p->spec.tag = xstrdup(spec->tag); | |
410c8acf | 829 | p->ks = 0; |
629842d8 | 830 | p->pings = 0; |
64cf2223 | 831 | p->ifname = 0; |
5bb41301 | 832 | memset(&p->st, 0, sizeof(stats)); |
833 | p->st.t_start = time(0); | |
388e0319 | 834 | if (!(tops->flags & TUNF_PRIVOPEN)) |
eb5f3fea | 835 | fd = -1; |
388e0319 | 836 | else if ((fd = ps_tunfd(tops, &p->ifname)) < 0) |
c8e02c8a | 837 | goto tidy_2; |
eb5f3fea MW |
838 | if ((p->t = tops->create(p, fd, &p->ifname)) == 0) |
839 | goto tidy_3; | |
840 | T( trace(T_TUNNEL, "peer: attached interface %s to peer `%s'", | |
841 | p->ifname, p_name(p)); ) | |
0ba8de86 | 842 | p_setkatimer(p); |
8743c776 | 843 | if (kx_init(&p->kx, p, &p->ks, p->spec.f & PSF_KXMASK)) |
eb5f3fea | 844 | goto tidy_4; |
f43df819 | 845 | a_notify("ADD", |
6047fbac MW |
846 | "?PEER", p, |
847 | "%s", p->ifname, | |
848 | "?ADDR", &p->spec.sa, | |
849 | A_END); | |
8743c776 | 850 | if (!(p->spec.f & KXF_CORK)) { |
010e6f63 | 851 | a_notify("KXSTART", "?PEER", p, A_END); |
f43df819 | 852 | /* Couldn't tell anyone before */ |
010e6f63 | 853 | } |
6411163d | 854 | if (p->spec.f & PSF_MOBILE) nmobile++; |
410c8acf | 855 | return (p); |
856 | ||
eb5f3fea | 857 | tidy_4: |
0ba8de86 | 858 | if (spec->t_ka) |
859 | sel_rmtimer(&p->tka); | |
72917fe7 | 860 | xfree(p->ifname); |
0ba8de86 | 861 | p->t->ops->destroy(p->t); |
eb5f3fea MW |
862 | tidy_3: |
863 | if (fd >= 0) close(fd); | |
c8e02c8a MW |
864 | tidy_2: |
865 | am_remove(&byaddr, p->byaddr); | |
48b84569 | 866 | if (p->spec.tag) xfree(p->spec.tag); |
c8e02c8a MW |
867 | tidy_1: |
868 | sym_remove(&byname, p->byname); | |
410c8acf | 869 | tidy_0: |
410c8acf | 870 | DESTROY(p); |
871 | return (0); | |
872 | } | |
873 | ||
874 | /* --- @p_name@ --- * | |
875 | * | |
876 | * Arguments: @peer *p@ = pointer to a peer block | |
877 | * | |
878 | * Returns: A pointer to the peer's name. | |
879 | */ | |
880 | ||
6411163d MW |
881 | const char *p_name(peer *p) |
882 | { if (p) return (p->spec.name); else return ("-"); } | |
410c8acf | 883 | |
48b84569 MW |
884 | /* --- @p_tag@ --- * |
885 | * | |
886 | * Arguments: @peer *p@ = pointer to a peer block | |
887 | * | |
888 | * Returns: A pointer to the peer's public key tag. | |
889 | */ | |
890 | ||
891 | const char *p_tag(peer *p) | |
892 | { return (p->spec.tag ? p->spec.tag : p->spec.name); } | |
893 | ||
060ca767 | 894 | /* --- @p_spec@ --- * |
895 | * | |
896 | * Arguments: @peer *p@ = pointer to a peer block | |
897 | * | |
898 | * Returns: Pointer to the peer's specification | |
899 | */ | |
900 | ||
901 | const peerspec *p_spec(peer *p) { return (&p->spec); } | |
902 | ||
c8e02c8a MW |
903 | /* --- @p_findbyaddr@ --- * |
904 | * | |
905 | * Arguments: @const addr *a@ = address to look up | |
906 | * | |
907 | * Returns: Pointer to the peer block, or null if not found. | |
908 | * | |
909 | * Use: Finds a peer by address. | |
910 | */ | |
911 | ||
912 | peer *p_findbyaddr(const addr *a) | |
913 | { | |
914 | peer_byaddr *pa; | |
915 | ||
6411163d MW |
916 | if ((pa = am_find(&byaddr, a, 0, 0)) != 0) { |
917 | assert(pa->p); | |
c8e02c8a | 918 | return (pa->p); |
6411163d | 919 | } |
c8e02c8a MW |
920 | return (0); |
921 | } | |
922 | ||
410c8acf | 923 | /* --- @p_find@ --- * |
924 | * | |
925 | * Arguments: @const char *name@ = name to look up | |
926 | * | |
927 | * Returns: Pointer to the peer block, or null if not found. | |
928 | * | |
929 | * Use: Finds a peer by name. | |
930 | */ | |
931 | ||
932 | peer *p_find(const char *name) | |
933 | { | |
c8e02c8a MW |
934 | peer_byname *pn; |
935 | ||
936 | if ((pn = sym_find(&byname, name, -1, 0, 0)) != 0) | |
937 | return (pn->p); | |
e04c2d50 | 938 | return (0); |
410c8acf | 939 | } |
940 | ||
941 | /* --- @p_destroy@ --- * | |
942 | * | |
943 | * Arguments: @peer *p@ = pointer to a peer | |
944 | * | |
945 | * Returns: --- | |
946 | * | |
947 | * Use: Destroys a peer. | |
948 | */ | |
949 | ||
950 | void p_destroy(peer *p) | |
951 | { | |
0ba8de86 | 952 | ping *pg, *ppg; |
953 | ||
954 | T( trace(T_PEER, "peer: destroying peer `%s'", p->spec.name); ) | |
f43df819 | 955 | a_notify("KILL", "%s", p->spec.name, A_END); |
5bb41301 | 956 | ksl_free(&p->ks); |
410c8acf | 957 | kx_free(&p->kx); |
6411163d MW |
958 | if (p->spec.f & PSF_MOBILE) |
959 | nmobile--; | |
64cf2223 MW |
960 | if (p->ifname) |
961 | xfree(p->ifname); | |
48b84569 MW |
962 | if (p->spec.tag) |
963 | xfree(p->spec.tag); | |
42da2a58 | 964 | p->t->ops->destroy(p->t); |
0ba8de86 | 965 | if (p->spec.t_ka) |
966 | sel_rmtimer(&p->tka); | |
0ba8de86 | 967 | for (pg = p->pings; pg; pg = ppg) { |
968 | ppg = pg->next; | |
969 | p_pingdone(pg, PING_PEERDIED); | |
970 | } | |
c8e02c8a MW |
971 | sym_remove(&byname, p->byname); |
972 | am_remove(&byaddr, p->byaddr); | |
410c8acf | 973 | DESTROY(p); |
974 | } | |
975 | ||
c8e02c8a MW |
976 | /* --- @p_mkiter@ --- * |
977 | * | |
978 | * Arguments: @peer_iter *i@ = pointer to an iterator | |
979 | * | |
980 | * Returns: --- | |
981 | * | |
982 | * Use: Initializes the iterator. | |
983 | */ | |
984 | ||
985 | void p_mkiter(peer_iter *i) { sym_mkiter(&i->i, &byname); } | |
986 | ||
987 | /* --- @p_next@ --- * | |
988 | * | |
989 | * Arguments: @peer_iter *i@ = pointer to an iterator | |
410c8acf | 990 | * |
c8e02c8a | 991 | * Returns: Next peer, or null if at the end. |
410c8acf | 992 | * |
c8e02c8a | 993 | * Use: Returns the next peer. |
410c8acf | 994 | */ |
995 | ||
c8e02c8a MW |
996 | peer *p_next(peer_iter *i) |
997 | { | |
998 | peer_byname *pn; | |
999 | ||
1000 | if ((pn = sym_next(&i->i)) == 0) | |
1001 | return (0); | |
1002 | return (pn->p); | |
1003 | } | |
410c8acf | 1004 | |
1005 | /*----- That's all, folks -------------------------------------------------*/ |