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