Commit | Line | Data |
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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 | * | |
11ad66c2 MW |
12 | * TrIPE is free software: you can redistribute it and/or modify it under |
13 | * the terms of the GNU General Public License as published by the Free | |
14 | * Software Foundation; either version 3 of the License, or (at your | |
15 | * option) any later version. | |
e04c2d50 | 16 | * |
11ad66c2 MW |
17 | * TrIPE is distributed in the hope that it will be useful, but WITHOUT |
18 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
19 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
20 | * for more details. | |
e04c2d50 | 21 | * |
410c8acf | 22 | * You should have received a copy of the GNU General Public License |
11ad66c2 | 23 | * along with TrIPE. If not, see <https://www.gnu.org/licenses/>. |
410c8acf | 24 | */ |
25 | ||
410c8acf | 26 | /*----- Header files ------------------------------------------------------*/ |
27 | ||
28 | #include "tripe.h" | |
29 | ||
30 | /*----- Static variables --------------------------------------------------*/ | |
31 | ||
c8e02c8a MW |
32 | static sym_table byname; |
33 | static addrmap byaddr; | |
410c8acf | 34 | static sel_file sock; |
6411163d | 35 | static unsigned nmobile; |
410c8acf | 36 | |
42da2a58 | 37 | /*----- Tunnel table ------------------------------------------------------*/ |
38 | ||
39 | const tunnel_ops *tunnels[] = { | |
40 | #ifdef TUN_LINUX | |
41 | &tun_linux, | |
42 | #endif | |
43 | #ifdef TUN_BSD | |
44 | &tun_bsd, | |
45 | #endif | |
46 | #ifdef TUN_UNET | |
47 | &tun_unet, | |
48 | #endif | |
49 | &tun_slip, | |
50 | 0 | |
51 | }, *tun_default; | |
52 | ||
410c8acf | 53 | /*----- Main code ---------------------------------------------------------*/ |
54 | ||
0ba8de86 | 55 | /* --- @p_pingtype@ --- * |
56 | * | |
57 | * Arguments: @unsigned msg@ = message type | |
58 | * | |
59 | * Returns: String to describe the message. | |
60 | */ | |
61 | ||
62 | static const char *p_pingtype(unsigned msg) | |
63 | { | |
64 | switch (msg & MSG_TYPEMASK) { | |
65 | case MISC_PING: | |
66 | case MISC_PONG: | |
67 | return "transport-ping"; | |
68 | case MISC_EPING: | |
69 | case MISC_EPONG: | |
70 | return "encrypted-ping"; | |
71 | default: | |
72 | abort(); | |
73 | } | |
74 | } | |
75 | ||
76 | /* --- @p_ponged@ --- * | |
77 | * | |
78 | * Arguments: @peer *p@ = peer packet arrived from | |
79 | * @unsigned msg@ = message type | |
80 | * @buf *b@ = buffer containing payload | |
81 | * | |
82 | * Returns: --- | |
83 | * | |
84 | * Use: Processes a ping response. | |
85 | */ | |
86 | ||
87 | static void p_ponged(peer *p, unsigned msg, buf *b) | |
88 | { | |
89 | uint32 id; | |
90 | const octet *magic; | |
91 | ping *pg; | |
e04c2d50 | 92 | |
0ba8de86 | 93 | IF_TRACING(T_PEER, { |
94 | trace(T_PEER, "peer: received %s reply from %s", | |
95 | p_pingtype(msg), p->spec.name); | |
96 | trace_block(T_PACKET, "peer: ping contents", BBASE(b), BSZ(b)); | |
97 | }) | |
98 | ||
99 | if (buf_getu32(b, &id) || | |
100 | (magic = buf_get(b, sizeof(pg->magic))) == 0 || | |
101 | BLEFT(b)) { | |
f43df819 | 102 | a_warn("PEER", "?PEER", p, "malformed-%s", p_pingtype(msg), A_END); |
0ba8de86 | 103 | return; |
104 | } | |
105 | ||
106 | for (pg = p->pings; pg; pg = pg->next) { | |
107 | if (pg->id == id) | |
108 | goto found; | |
109 | } | |
f43df819 MW |
110 | a_warn("PEER", |
111 | "?PEER", p, | |
112 | "unexpected-%s", p_pingtype(msg), | |
113 | "0x%08lx", (unsigned long)id, | |
114 | A_END); | |
0ba8de86 | 115 | return; |
116 | ||
117 | found: | |
118 | if (memcmp(magic, pg->magic, sizeof(pg->magic)) != 0) { | |
f43df819 | 119 | a_warn("PEER", "?PEER", p, "corrupt-%s", p_pingtype(msg), A_END); |
0ba8de86 | 120 | return; |
121 | } | |
122 | p_pingdone(pg, PING_OK); | |
123 | } | |
124 | ||
6411163d MW |
125 | /* --- @p_rxupdstats@ --- * |
126 | * | |
127 | * Arguments: @peer *p@ = peer to update | |
128 | * @size_t n@ = size of incoming packet | |
129 | * | |
130 | * Returns: --- | |
131 | * | |
132 | * Use: Updates the peer's incoming packet statistics. | |
133 | */ | |
134 | ||
135 | static void p_rxupdstats(peer *p, size_t n) | |
136 | { | |
137 | p->st.t_last = time(0); | |
138 | p->st.n_in++; | |
139 | p->st.sz_in += n; | |
140 | } | |
141 | ||
a50f9a0e MW |
142 | /* --- @p_encrypt@ --- * |
143 | * | |
144 | * Arguments: @peer *p@ = peer to encrypt message to | |
145 | * @int ty@ message type to send | |
146 | * @buf *bin, *bout@ = input and output buffers | |
147 | * | |
148 | * Returns: --- | |
149 | * | |
150 | * Use: Convenience function for packet encryption. Forces | |
151 | * renegotiation when necessary. Check for the output buffer | |
152 | * being broken to find out whether the encryption was | |
153 | * successful. | |
154 | */ | |
155 | ||
156 | static int p_encrypt(peer *p, int ty, buf *bin, buf *bout) | |
157 | { | |
158 | int err = ksl_encrypt(&p->ks, ty, bin, bout); | |
159 | ||
160 | if (err == KSERR_REGEN) { | |
161 | kx_start(&p->kx, 1); | |
162 | err = 0; | |
163 | } | |
164 | if (!BOK(bout)) | |
165 | err = -1; | |
166 | return (err); | |
167 | } | |
168 | ||
169 | /* --- @p_decrypt@ --- * | |
170 | * | |
6411163d MW |
171 | * Arguments: @peer **pp@ = pointer to peer to decrypt message from |
172 | * @addr *a@ = address the packet arrived on | |
173 | * @size_t n@ = size of original incoming packet | |
a50f9a0e MW |
174 | * @int ty@ = message type to expect |
175 | * @buf *bin, *bout@ = input and output buffers | |
176 | * | |
177 | * Returns: Zero on success; nonzero on error. | |
178 | * | |
179 | * Use: Convenience function for packet decryption. Reports errors | |
180 | * and updates statistics appropriately. | |
6411163d MW |
181 | * |
182 | * If @*pp@ is null on entry and there are mobile peers then we | |
183 | * see if any of them can decrypt the packet. If so, we record | |
184 | * @*a@ as the peer's new address and send a notification. | |
a50f9a0e MW |
185 | */ |
186 | ||
6411163d MW |
187 | static int p_decrypt(peer **pp, addr *a, size_t n, |
188 | int ty, buf *bin, buf *bout) | |
a50f9a0e | 189 | { |
c71be758 MW |
190 | peer *p, *q; |
191 | peer_byaddr *pa, *qa; | |
6411163d MW |
192 | int err = KSERR_DECRYPT; |
193 | unsigned f; | |
194 | ||
c71be758 MW |
195 | /* --- If we have a match on the source address then try that first --- */ |
196 | ||
197 | q = *pp; | |
198 | if (q) { | |
6411163d | 199 | T( trace(T_PEER, "peer: decrypting packet from known peer `%s'", |
c71be758 MW |
200 | p_name(q)); ) |
201 | if ((err = ksl_decrypt(&q->ks, ty, bin, bout)) != KSERR_DECRYPT || | |
202 | !(q->spec.f & PSF_MOBILE) || nmobile == 1) { | |
203 | p = q; | |
204 | goto match; | |
205 | } | |
73174919 | 206 | T( trace(T_PEER, "peer: failed to decrypt: try other mobile peers..."); ) |
c71be758 | 207 | } else if (nmobile) |
8ed35e02 | 208 | T( trace(T_PEER, "peer: unknown source: trying mobile peers...") ); |
c71be758 | 209 | else { |
6411163d | 210 | p = 0; |
c71be758 MW |
211 | goto searched; |
212 | } | |
213 | ||
214 | /* --- See whether any mobile peer is interested --- */ | |
215 | ||
01c21903 MW |
216 | p = 0; |
217 | FOREACH_PEER(qq, { | |
218 | if (qq == q || !(qq->spec.f & PSF_MOBILE)) continue; | |
219 | if ((err = ksl_decrypt(&qq->ks, ty, bin, bout)) == KSERR_DECRYPT) { | |
c71be758 | 220 | T( trace(T_PEER, "peer: peer `%s' failed to decrypt", |
01c21903 | 221 | p_name(qq)); ) |
c71be758 MW |
222 | continue; |
223 | } else { | |
01c21903 | 224 | p = qq; |
c71be758 MW |
225 | IF_TRACING(T_PEER, { |
226 | if (!err) | |
01c21903 | 227 | trace(T_PEER, "peer: peer `%s' reports success", p_name(qq)); |
c71be758 MW |
228 | else { |
229 | trace(T_PEER, "peer: peer `%s' reports decryption error %d", | |
01c21903 | 230 | p_name(qq), err); |
6411163d | 231 | } |
c71be758 MW |
232 | }) |
233 | break; | |
6411163d | 234 | } |
c71be758 MW |
235 | }); |
236 | ||
237 | /* --- We've searched the mobile peers --- */ | |
238 | ||
239 | searched: | |
240 | if (!p) { | |
01c21903 MW |
241 | if (!q) |
242 | a_warn("PEER", "-", "unexpected-source", "?ADDR", a, A_END); | |
243 | else { | |
244 | a_warn("PEER", "?PEER", p, "decrypt-failed", | |
245 | "error-code", "%d", err, A_END); | |
246 | p_rxupdstats(q, n); | |
247 | } | |
c71be758 MW |
248 | return (-1); |
249 | } | |
250 | ||
251 | /* --- We found one that accepted, so update the peer's address --- * | |
252 | * | |
253 | * If we had an initial guess of which peer this packet came from -- i.e., | |
254 | * @q@ is not null -- then swap the addresses over. This doesn't leave the | |
255 | * evicted peer in an especially good state, but it ought to get sorted out | |
256 | * soon enough. | |
257 | */ | |
258 | ||
259 | if (!err) { | |
01c21903 | 260 | *pp = p; |
c71be758 | 261 | if (!q) { |
6411163d | 262 | T( trace(T_PEER, "peer: updating address for `%s'", p_name(p)); ) |
6411163d MW |
263 | pa = am_find(&byaddr, a, sizeof(peer_byaddr), &f); assert(!f); |
264 | am_remove(&byaddr, p->byaddr); | |
265 | p->byaddr = pa; | |
266 | pa->p = p; | |
267 | p->spec.sa = *a; | |
268 | a_notify("NEWADDR", "?PEER", p, "?ADDR", a, A_END); | |
c71be758 MW |
269 | } else { |
270 | T( trace(T_PEER, "peer: swapping addresses for `%s' and `%s'", | |
271 | p_name(p), p_name(q)); ) | |
272 | pa = p->byaddr; qa = q->byaddr; | |
273 | pa->p = q; q->byaddr = pa; q->spec.sa = p->spec.sa; | |
274 | qa->p = p; p->byaddr = qa; p->spec.sa = *a; | |
275 | a_notify("NEWADDR", "?PEER", p, "?ADDR", a, A_END); | |
276 | a_notify("NEWADDR", "?PEER", q, "?ADDR", &q->spec.sa, A_END); | |
6411163d MW |
277 | } |
278 | } | |
c71be758 MW |
279 | |
280 | match: | |
88622d1d | 281 | p_rxupdstats(p, n); |
6411163d MW |
282 | if (err) { |
283 | if (p) p->st.n_reject++; | |
284 | a_warn("PEER", "?PEER", p, "decrypt-failed", | |
285 | "error-code", "%d", err, A_END); | |
a50f9a0e MW |
286 | return (-1); |
287 | } | |
288 | if (!BOK(bout)) | |
289 | return (-1); | |
290 | return (0); | |
291 | } | |
292 | ||
410c8acf | 293 | /* --- @p_read@ --- * |
294 | * | |
295 | * Arguments: @int fd@ = file descriptor to read from | |
296 | * @unsigned mode@ = what happened | |
297 | * @void *v@ = an uninteresting pointer | |
298 | * | |
299 | * Returns: --- | |
300 | * | |
301 | * Use: Reads a packet from somewhere. | |
302 | */ | |
303 | ||
304 | static void p_read(int fd, unsigned mode, void *v) | |
305 | { | |
37941236 | 306 | peer *p = 0; |
410c8acf | 307 | addr a; |
cb160b86 | 308 | socklen_t sz; |
410c8acf | 309 | ssize_t n; |
310 | int ch; | |
311 | buf b, bb; | |
312 | ||
313 | /* --- Read the data --- */ | |
314 | ||
f4c9c08f | 315 | QUICKRAND; |
410c8acf | 316 | sz = sizeof(addr); |
317 | n = recvfrom(fd, buf_i, sizeof(buf_i), 0, &a.sa, &sz); | |
318 | if (n < 0) { | |
f43df819 | 319 | a_warn("PEER", "-", "socket-read-error", "?ERRNO", A_END); |
410c8acf | 320 | return; |
321 | } | |
322 | ||
37941236 | 323 | /* --- If the packet is a greeting, don't check peers --- */ |
324 | ||
325 | if (n && buf_i[0] == (MSG_MISC | MISC_GREET)) { | |
326 | IF_TRACING(T_PEER, { | |
327 | trace(T_PEER, "peer: greeting received from INET %s %u", | |
328 | inet_ntoa(a.sin.sin_addr), | |
329 | (unsigned)ntohs(a.sin.sin_port)); | |
330 | trace_block(T_PACKET, "peer: greeting contents", buf_i, n); | |
331 | }) | |
332 | buf_init(&b, buf_i, n); | |
333 | buf_getbyte(&b); | |
334 | if (c_check(&b) || BLEFT(&b)) { | |
f43df819 | 335 | a_warn("PEER", "-", "invalid-greeting", A_END); |
37941236 | 336 | return; |
337 | } | |
f43df819 MW |
338 | a_notify("GREET", |
339 | "?B64", buf_i + 1, (size_t)(n - 1), | |
340 | "?ADDR", &a, | |
341 | A_END); | |
37941236 | 342 | return; |
343 | } | |
344 | ||
6411163d MW |
345 | /* --- Find the appropriate peer --- * |
346 | * | |
347 | * At this stage, don't worry too much about whether we actually found it. | |
348 | */ | |
410c8acf | 349 | |
6411163d | 350 | p = p_findbyaddr(&a); |
410c8acf | 351 | |
b9066fbb | 352 | IF_TRACING(T_PEER, { |
6411163d MW |
353 | if (p) { |
354 | trace(T_PEER, | |
355 | "peer: packet received from `%s' from address INET %s %d", | |
356 | p_name(p), inet_ntoa(a.sin.sin_addr), ntohs(a.sin.sin_port)); | |
357 | } else { | |
358 | trace(T_PEER, "peer: packet received from unknown address INET %s %d", | |
359 | inet_ntoa(a.sin.sin_addr), ntohs(a.sin.sin_port)); | |
360 | } | |
b9066fbb | 361 | trace_block(T_PACKET, "peer: packet contents", buf_i, n); |
362 | }) | |
410c8acf | 363 | |
364 | /* --- Pick the packet apart --- */ | |
365 | ||
366 | buf_init(&b, buf_i, n); | |
367 | if ((ch = buf_getbyte(&b)) < 0) { | |
f43df819 | 368 | a_warn("PEER", "?PEER", p, "bad-packet", "no-type", A_END); |
410c8acf | 369 | return; |
370 | } | |
5bb41301 | 371 | switch (ch & MSG_CATMASK) { |
410c8acf | 372 | case MSG_PACKET: |
5bb41301 | 373 | if (ch & MSG_TYPEMASK) { |
f43df819 MW |
374 | a_warn("PEER", |
375 | "?PEER", p, | |
376 | "bad-packet", | |
377 | "unknown-type", "0x%02x", ch, | |
378 | A_END); | |
6411163d | 379 | if (p) p->st.n_reject++; |
5bb41301 | 380 | return; |
381 | } | |
410c8acf | 382 | buf_init(&bb, buf_o, sizeof(buf_o)); |
6411163d | 383 | if (p_decrypt(&p, &a, n, MSG_PACKET, &b, &bb)) |
410c8acf | 384 | return; |
5bb41301 | 385 | if (BOK(&bb)) { |
386 | p->st.n_ipin++; | |
387 | p->st.sz_ipin += BSZ(&b); | |
42da2a58 | 388 | p->t->ops->inject(p->t, &bb); |
5bb41301 | 389 | } else { |
390 | p->st.n_reject++; | |
f43df819 | 391 | a_warn("PEER", "?PEER", p, "packet-build-failed", A_END); |
5bb41301 | 392 | } |
410c8acf | 393 | break; |
5bb41301 | 394 | case MSG_KEYEXCH: |
6411163d | 395 | if (!p) goto unexp; |
88622d1d | 396 | p_rxupdstats(p, n); |
5bb41301 | 397 | kx_message(&p->kx, ch & MSG_TYPEMASK, &b); |
410c8acf | 398 | break; |
0ba8de86 | 399 | case MSG_MISC: |
400 | switch (ch & MSG_TYPEMASK) { | |
401 | case MISC_NOP: | |
6411163d | 402 | if (!p) goto unexp; |
88622d1d | 403 | p_rxupdstats(p, n); |
0ba8de86 | 404 | T( trace(T_PEER, "peer: received NOP packet"); ) |
405 | break; | |
406 | case MISC_PING: | |
6411163d | 407 | if (!p) goto unexp; |
88622d1d | 408 | p_rxupdstats(p, n); |
0ba8de86 | 409 | buf_put(p_txstart(p, MSG_MISC | MISC_PONG), BCUR(&b), BLEFT(&b)); |
410 | p_txend(p); | |
e04c2d50 | 411 | break; |
0ba8de86 | 412 | case MISC_PONG: |
6411163d | 413 | if (!p) goto unexp; |
88622d1d | 414 | p_rxupdstats(p, n); |
0ba8de86 | 415 | p_ponged(p, MISC_PONG, &b); |
416 | break; | |
417 | case MISC_EPING: | |
418 | buf_init(&bb, buf_t, sizeof(buf_t)); | |
6411163d | 419 | if (p_decrypt(&p, &a, n, ch, &b, &bb)) |
0ba8de86 | 420 | return; |
0ba8de86 | 421 | if (BOK(&bb)) { |
422 | buf_flip(&bb); | |
a50f9a0e MW |
423 | p_encrypt(p, MSG_MISC | MISC_EPONG, &bb, |
424 | p_txstart(p, MSG_MISC | MISC_EPONG)); | |
0ba8de86 | 425 | p_txend(p); |
426 | } | |
427 | break; | |
428 | case MISC_EPONG: | |
429 | buf_init(&bb, buf_t, sizeof(buf_t)); | |
6411163d | 430 | if (p_decrypt(&p, &a, n, ch, &b, &bb)) |
0ba8de86 | 431 | return; |
0ba8de86 | 432 | if (BOK(&bb)) { |
433 | buf_flip(&bb); | |
434 | p_ponged(p, MISC_EPONG, &bb); | |
435 | } | |
436 | break; | |
437 | } | |
438 | break; | |
410c8acf | 439 | default: |
6411163d | 440 | if (p) p->st.n_reject++; |
f43df819 MW |
441 | a_warn("PEER", |
442 | "?PEER", p, | |
443 | "bad-packet", | |
a68280fc | 444 | "unknown-category", "0x%02x", ch, |
f43df819 | 445 | A_END); |
410c8acf | 446 | break; |
6411163d MW |
447 | unexp: |
448 | a_warn("PEER", "-", "unexpected-source", "?ADDR", &a, A_END); | |
449 | break; | |
410c8acf | 450 | } |
451 | } | |
452 | ||
453 | /* --- @p_txstart@ --- * | |
454 | * | |
455 | * Arguments: @peer *p@ = pointer to peer block | |
456 | * @unsigned msg@ = message type code | |
457 | * | |
458 | * Returns: A pointer to a buffer to write to. | |
459 | * | |
460 | * Use: Starts sending to a peer. Only one send can happen at a | |
461 | * time. | |
462 | */ | |
463 | ||
464 | buf *p_txstart(peer *p, unsigned msg) | |
465 | { | |
466 | buf_init(&p->b, buf_o, sizeof(buf_o)); | |
467 | buf_putbyte(&p->b, msg); | |
468 | return (&p->b); | |
469 | } | |
470 | ||
471 | /* --- @p_txend@ --- * | |
472 | * | |
473 | * Arguments: @peer *p@ = pointer to peer block | |
474 | * | |
475 | * Returns: --- | |
476 | * | |
477 | * Use: Sends a packet to the peer. | |
478 | */ | |
479 | ||
0ba8de86 | 480 | static void p_setkatimer(peer *); |
481 | ||
482 | static int p_dotxend(peer *p) | |
410c8acf | 483 | { |
484 | if (!BOK(&p->b)) { | |
f43df819 | 485 | a_warn("PEER", "?PEER", p, "packet-build-failed", A_END); |
0ba8de86 | 486 | return (0); |
410c8acf | 487 | } |
488 | IF_TRACING(T_PEER, trace_block(T_PACKET, "peer: sending packet", | |
489 | BBASE(&p->b), BLEN(&p->b)); ) | |
490 | if (sendto(sock.fd, BBASE(&p->b), BLEN(&p->b), | |
0ba8de86 | 491 | 0, &p->spec.sa.sa, p->spec.sasz) < 0) { |
f43df819 | 492 | a_warn("PEER", "?PEER", p, "socket-write-error", "?ERRNO", A_END); |
0ba8de86 | 493 | return (0); |
494 | } else { | |
5bb41301 | 495 | p->st.n_out++; |
496 | p->st.sz_out += BLEN(&p->b); | |
0ba8de86 | 497 | return (1); |
5bb41301 | 498 | } |
410c8acf | 499 | } |
500 | ||
0ba8de86 | 501 | void p_txend(peer *p) |
502 | { | |
503 | if (p_dotxend(p) && p->spec.t_ka) { | |
504 | sel_rmtimer(&p->tka); | |
505 | p_setkatimer(p); | |
506 | } | |
507 | } | |
508 | ||
509 | /* --- @p_pingwrite@ --- * | |
510 | * | |
511 | * Arguments: @ping *p@ = ping structure | |
512 | * @buf *b@ = buffer to write in | |
513 | * | |
514 | * Returns: --- | |
515 | * | |
516 | * Use: Fills in a ping structure and writes the packet payload. | |
517 | */ | |
518 | ||
519 | static void p_pingwrite(ping *p, buf *b) | |
520 | { | |
521 | static uint32 seq = 0; | |
522 | ||
523 | p->id = U32(seq++); | |
524 | GR_FILL(&rand_global, p->magic, sizeof(p->magic)); | |
525 | buf_putu32(b, p->id); | |
526 | buf_put(b, p->magic, sizeof(p->magic)); | |
527 | } | |
528 | ||
529 | /* --- @p_pingdone@ --- * | |
530 | * | |
531 | * Arguments: @ping *p@ = ping structure | |
532 | * @int rc@ = return code to pass on | |
533 | * | |
534 | * Returns: --- | |
535 | * | |
536 | * Use: Disposes of a ping structure, maybe sending a notification. | |
537 | */ | |
538 | ||
539 | void p_pingdone(ping *p, int rc) | |
540 | { | |
0ba8de86 | 541 | if (p->prev) p->prev->next = p->next; |
542 | else p->p->pings = p->next; | |
543 | if (p->next) p->next->prev = p->prev; | |
544 | if (rc != PING_TIMEOUT) sel_rmtimer(&p->t); | |
060ca767 | 545 | T( trace(T_PEER, "peer: ping 0x%08lx done (rc = %d)", |
546 | (unsigned long)p->id, rc); ) | |
0ba8de86 | 547 | if (rc >= 0) p->func(rc, p->arg); |
548 | } | |
549 | ||
550 | /* --- @p_pingtimeout@ --- * | |
551 | * | |
552 | * Arguments: @struct timeval *now@ = the time now | |
553 | * @void *pv@ = pointer to ping block | |
554 | * | |
555 | * Returns: --- | |
556 | * | |
557 | * Use: Called when a ping times out. | |
558 | */ | |
559 | ||
560 | static void p_pingtimeout(struct timeval *now, void *pv) | |
561 | { | |
562 | ping *p = pv; | |
563 | ||
564 | T( trace(T_PEER, "peer: ping 0x%08lx timed out", (unsigned long)p->id); ) | |
565 | p_pingdone(p, PING_TIMEOUT); | |
566 | } | |
567 | ||
568 | /* --- @p_pingsend@ --- * | |
569 | * | |
570 | * Arguments: @peer *p@ = destination peer | |
571 | * @ping *pg@ = structure to fill in | |
572 | * @unsigned type@ = message type | |
573 | * @unsigned long timeout@ = how long to wait before giving up | |
574 | * @void (*func)(int, void *)@ = callback function | |
575 | * @void *arg@ = argument for callback | |
576 | * | |
577 | * Returns: Zero if successful, nonzero if it failed. | |
578 | * | |
579 | * Use: Sends a ping to a peer. Call @func@ with a nonzero argument | |
580 | * if we get an answer within the timeout, or zero if no answer. | |
581 | */ | |
582 | ||
583 | int p_pingsend(peer *p, ping *pg, unsigned type, | |
584 | unsigned long timeout, | |
585 | void (*func)(int, void *), void *arg) | |
586 | { | |
587 | buf *b, bb; | |
588 | struct timeval tv; | |
589 | ||
0ba8de86 | 590 | switch (type) { |
591 | case MISC_PING: | |
592 | pg->msg = MISC_PONG; | |
593 | b = p_txstart(p, MSG_MISC | MISC_PING); | |
594 | p_pingwrite(pg, b); | |
595 | p_txend(p); | |
596 | break; | |
597 | case MISC_EPING: | |
598 | pg->msg = MISC_EPONG; | |
599 | b = p_txstart(p, MSG_MISC | MISC_EPING); | |
600 | buf_init(&bb, buf_t, sizeof(buf_t)); | |
601 | p_pingwrite(pg, &bb); | |
602 | buf_flip(&bb); | |
a50f9a0e | 603 | p_encrypt(p, MSG_MISC | MISC_EPING, &bb, b); |
0ba8de86 | 604 | if (!BOK(b)) |
605 | return (-1); | |
606 | p_txend(p); | |
607 | break; | |
608 | default: | |
609 | abort(); | |
610 | break; | |
611 | } | |
612 | ||
613 | pg->next = p->pings; | |
614 | pg->prev = 0; | |
615 | pg->p = p; | |
616 | pg->func = func; | |
617 | pg->arg = arg; | |
060ca767 | 618 | if (p->pings) p->pings->prev = pg; |
0ba8de86 | 619 | p->pings = pg; |
620 | gettimeofday(&tv, 0); | |
621 | tv.tv_sec += timeout; | |
622 | sel_addtimer(&sel, &pg->t, &tv, p_pingtimeout, pg); | |
623 | T( trace(T_PEER, "peer: send %s 0x%08lx to %s", | |
624 | p_pingtype(type), (unsigned long)pg->id, p->spec.name); ) | |
625 | return (0); | |
626 | } | |
627 | ||
37941236 | 628 | /* --- @p_greet@ --- * |
629 | * | |
630 | * Arguments: @peer *p@ = peer to send to | |
631 | * @const void *c@ = pointer to challenge | |
632 | * @size_t sz@ = size of challenge | |
633 | * | |
634 | * Returns: --- | |
635 | * | |
636 | * Use: Sends a greeting packet. | |
637 | */ | |
638 | ||
639 | void p_greet(peer *p, const void *c, size_t sz) | |
640 | { | |
641 | buf *b = p_txstart(p, MSG_MISC | MISC_GREET); | |
642 | buf_put(b, c, sz); | |
643 | p_txend(p); | |
644 | } | |
645 | ||
410c8acf | 646 | /* --- @p_tun@ --- * |
647 | * | |
648 | * Arguments: @peer *p@ = pointer to peer block | |
649 | * @buf *b@ = buffer containing incoming packet | |
650 | * | |
651 | * Returns: --- | |
652 | * | |
653 | * Use: Handles a packet which needs to be sent to a peer. | |
654 | */ | |
655 | ||
656 | void p_tun(peer *p, buf *b) | |
657 | { | |
658 | buf *bb = p_txstart(p, MSG_PACKET); | |
7b052fe6 | 659 | |
f4c9c08f | 660 | QUICKRAND; |
a50f9a0e | 661 | p_encrypt(p, MSG_PACKET, b, bb); |
5bb41301 | 662 | if (BOK(bb) && BLEN(bb)) { |
663 | p->st.n_ipout++; | |
664 | p->st.sz_ipout += BLEN(bb); | |
410c8acf | 665 | p_txend(p); |
5bb41301 | 666 | } |
410c8acf | 667 | } |
668 | ||
de014da6 | 669 | /* --- @p_keyreload@ --- * |
670 | * | |
671 | * Arguments: --- | |
672 | * | |
673 | * Returns: --- | |
674 | * | |
675 | * Use: Forces a check of the daemon's keyring files. | |
676 | */ | |
677 | ||
678 | void p_keyreload(void) | |
679 | { | |
c8e02c8a MW |
680 | if (km_reload()) |
681 | FOREACH_PEER(p, { kx_newkeys(&p->kx); }); | |
de014da6 | 682 | } |
683 | ||
410c8acf | 684 | /* --- @p_interval@ --- * |
685 | * | |
686 | * Arguments: --- | |
687 | * | |
688 | * Returns: --- | |
689 | * | |
690 | * Use: Called periodically to do tidying. | |
691 | */ | |
692 | ||
693 | void p_interval(void) | |
694 | { | |
de014da6 | 695 | p_keyreload(); |
c8e02c8a | 696 | FOREACH_PEER(p, { ksl_prune(&p->ks); }); |
410c8acf | 697 | } |
698 | ||
5bb41301 | 699 | /* --- @p_stats@ --- * |
700 | * | |
701 | * Arguments: @peer *p@ = pointer to a peer block | |
702 | * | |
703 | * Returns: A pointer to the peer's statistics. | |
704 | */ | |
705 | ||
706 | stats *p_stats(peer *p) { return (&p->st); } | |
707 | ||
410c8acf | 708 | /* --- @p_ifname@ --- * |
709 | * | |
710 | * Arguments: @peer *p@ = pointer to a peer block | |
711 | * | |
712 | * Returns: A pointer to the peer's interface name. | |
713 | */ | |
714 | ||
64cf2223 MW |
715 | const char *p_ifname(peer *p) { return (p->ifname); } |
716 | ||
717 | /* --- @p_setifname@ --- * | |
718 | * | |
719 | * Arguments: @peer *p@ = pointer to a peer block | |
720 | * @const char *name@ = pointer to the new name | |
721 | * | |
722 | * Returns: --- | |
723 | * | |
724 | * Use: Changes the name held for a peer's interface. | |
725 | */ | |
726 | ||
727 | void p_setifname(peer *p, const char *name) | |
72917fe7 MW |
728 | { |
729 | xfree(p->ifname); | |
730 | p->ifname = xstrdup(name); | |
731 | if (p->spec.tops->setifname) | |
732 | p->spec.tops->setifname(p->t, name); | |
733 | } | |
410c8acf | 734 | |
735 | /* --- @p_addr@ --- * | |
736 | * | |
737 | * Arguments: @peer *p@ = pointer to a peer block | |
738 | * | |
739 | * Returns: A pointer to the peer's address. | |
740 | */ | |
741 | ||
0ba8de86 | 742 | const addr *p_addr(peer *p) { return (&p->spec.sa); } |
410c8acf | 743 | |
744 | /* --- @p_init@ --- * | |
745 | * | |
767b36e2 | 746 | * Arguments: @struct in_addr addr@ = address to bind to |
747 | * @unsigned port@ = port number to listen to | |
410c8acf | 748 | * |
749 | * Returns: --- | |
750 | * | |
751 | * Use: Initializes the peer system; creates the socket. | |
752 | */ | |
753 | ||
767b36e2 | 754 | void p_init(struct in_addr addr, unsigned port) |
410c8acf | 755 | { |
756 | int fd; | |
757 | struct sockaddr_in sin; | |
df9dfccf | 758 | int len = PKBUFSZ; |
0a9920e2 | 759 | |
760 | /* --- Note on socket buffer sizes --- * | |
761 | * | |
762 | * For some bizarre reason, Linux 2.2 (at least) doubles the socket buffer | |
763 | * sizes I pass to @setsockopt@. I'm not putting special-case code here | |
764 | * for Linux: BSD (at least TCPv2) does what I tell it rather than second- | |
765 | * guessing me. | |
766 | */ | |
410c8acf | 767 | |
768 | if ((fd = socket(PF_INET, SOCK_DGRAM, 0)) < 0) | |
769 | die(EXIT_FAILURE, "socket creation failed: %s", strerror(errno)); | |
770 | BURN(sin); | |
771 | sin.sin_family = AF_INET; | |
767b36e2 | 772 | sin.sin_addr = addr; |
410c8acf | 773 | sin.sin_port = htons(port); |
774 | if (bind(fd, (struct sockaddr *)&sin, sizeof(sin))) | |
775 | die(EXIT_FAILURE, "bind failed: %s", strerror(errno)); | |
0a9920e2 | 776 | if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, sizeof(len)) || |
777 | setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &len, sizeof(len))) { | |
778 | die(EXIT_FAILURE, "failed to set socket buffer sizes: %s", | |
779 | strerror(errno)); | |
780 | } | |
650a6624 | 781 | fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC); |
410c8acf | 782 | sel_initfile(&sel, &sock, fd, SEL_READ, p_read, 0); |
783 | sel_addfile(&sock); | |
784 | T( trace(T_PEER, "peer: created socket"); ) | |
c8e02c8a MW |
785 | |
786 | sym_create(&byname); | |
787 | am_create(&byaddr); | |
410c8acf | 788 | } |
789 | ||
790 | /* --- @p_port@ --- * | |
791 | * | |
792 | * Arguments: --- | |
793 | * | |
794 | * Returns: Port number used for socket. | |
795 | */ | |
796 | ||
797 | unsigned p_port(void) | |
798 | { | |
799 | addr a; | |
cb160b86 | 800 | socklen_t sz = sizeof(addr); |
410c8acf | 801 | |
802 | if (getsockname(sock.fd, &a.sa, &sz)) | |
803 | die(EXIT_FAILURE, "couldn't read port number: %s", strerror(errno)); | |
804 | assert(a.sa.sa_family == AF_INET); | |
805 | return (ntohs(a.sin.sin_port)); | |
806 | } | |
807 | ||
0ba8de86 | 808 | /* --- @p_keepalive@ --- * |
809 | * | |
810 | * Arguments: @struct timeval *now@ = the current time | |
811 | * @void *pv@ = peer to wake up | |
812 | * | |
813 | * Returns: --- | |
814 | * | |
815 | * Use: Sends a keepalive ping message to its peer. | |
816 | */ | |
817 | ||
818 | static void p_keepalive(struct timeval *now, void *pv) | |
819 | { | |
820 | peer *p = pv; | |
fe2a5dcf | 821 | |
0ba8de86 | 822 | p_txstart(p, MSG_MISC | MISC_NOP); p_dotxend(p); |
823 | T( trace(T_PEER, "peer: sent keepalive to %s", p->spec.name); ) | |
824 | p_setkatimer(p); | |
825 | } | |
826 | ||
827 | /* --- @p_setkatimer@ --- * | |
828 | * | |
829 | * Arguments: @peer *p@ = peer to set | |
830 | * | |
831 | * Returns: --- | |
832 | * | |
833 | * Use: Resets the keepalive timer thing. | |
834 | */ | |
835 | ||
836 | static void p_setkatimer(peer *p) | |
837 | { | |
838 | struct timeval tv; | |
839 | ||
840 | if (!p->spec.t_ka) | |
841 | return; | |
842 | gettimeofday(&tv, 0); | |
843 | tv.tv_sec += p->spec.t_ka; | |
844 | sel_addtimer(&sel, &p->tka, &tv, p_keepalive, p); | |
845 | } | |
846 | ||
410c8acf | 847 | /* --- @p_create@ --- * |
848 | * | |
0ba8de86 | 849 | * Arguments: @peerspec *spec@ = information about this peer |
410c8acf | 850 | * |
851 | * Returns: Pointer to the peer block, or null if it failed. | |
852 | * | |
853 | * Use: Creates a new named peer block. No peer is actually attached | |
854 | * by this point. | |
855 | */ | |
856 | ||
0ba8de86 | 857 | peer *p_create(peerspec *spec) |
410c8acf | 858 | { |
859 | peer *p = CREATE(peer); | |
eb5f3fea MW |
860 | const tunnel_ops *tops = spec->tops; |
861 | int fd; | |
c8e02c8a MW |
862 | unsigned f; |
863 | ||
864 | p->byname = sym_find(&byname, spec->name, -1, sizeof(peer_byname), &f); | |
865 | if (f) goto tidy_0; | |
866 | p->byaddr = am_find(&byaddr, &spec->sa, sizeof(peer_byaddr), &f); | |
867 | if (f) goto tidy_1; | |
868 | p->byname->p = p->byaddr->p = p; | |
42da2a58 | 869 | |
0ba8de86 | 870 | T( trace(T_PEER, "peer: creating new peer `%s'", spec->name); ) |
871 | p->spec = *spec; | |
c8e02c8a | 872 | p->spec.name = (/*unconst*/ char *)SYM_NAME(p->byname); |
fe2a5dcf MW |
873 | if (spec->tag) p->spec.tag = xstrdup(spec->tag); |
874 | if (spec->privtag) p->spec.privtag = xstrdup(spec->privtag); | |
410c8acf | 875 | p->ks = 0; |
629842d8 | 876 | p->pings = 0; |
64cf2223 | 877 | p->ifname = 0; |
5bb41301 | 878 | memset(&p->st, 0, sizeof(stats)); |
879 | p->st.t_start = time(0); | |
388e0319 | 880 | if (!(tops->flags & TUNF_PRIVOPEN)) |
eb5f3fea | 881 | fd = -1; |
388e0319 | 882 | else if ((fd = ps_tunfd(tops, &p->ifname)) < 0) |
c8e02c8a | 883 | goto tidy_2; |
eb5f3fea MW |
884 | if ((p->t = tops->create(p, fd, &p->ifname)) == 0) |
885 | goto tidy_3; | |
886 | T( trace(T_TUNNEL, "peer: attached interface %s to peer `%s'", | |
887 | p->ifname, p_name(p)); ) | |
0ba8de86 | 888 | p_setkatimer(p); |
8743c776 | 889 | if (kx_init(&p->kx, p, &p->ks, p->spec.f & PSF_KXMASK)) |
eb5f3fea | 890 | goto tidy_4; |
f43df819 | 891 | a_notify("ADD", |
6047fbac MW |
892 | "?PEER", p, |
893 | "%s", p->ifname, | |
894 | "?ADDR", &p->spec.sa, | |
895 | A_END); | |
8743c776 | 896 | if (!(p->spec.f & KXF_CORK)) { |
010e6f63 | 897 | a_notify("KXSTART", "?PEER", p, A_END); |
f43df819 | 898 | /* Couldn't tell anyone before */ |
010e6f63 | 899 | } |
6411163d | 900 | if (p->spec.f & PSF_MOBILE) nmobile++; |
410c8acf | 901 | return (p); |
902 | ||
eb5f3fea | 903 | tidy_4: |
fe2a5dcf | 904 | if (spec->t_ka) sel_rmtimer(&p->tka); |
72917fe7 | 905 | xfree(p->ifname); |
0ba8de86 | 906 | p->t->ops->destroy(p->t); |
eb5f3fea MW |
907 | tidy_3: |
908 | if (fd >= 0) close(fd); | |
c8e02c8a MW |
909 | tidy_2: |
910 | am_remove(&byaddr, p->byaddr); | |
48b84569 | 911 | if (p->spec.tag) xfree(p->spec.tag); |
fe2a5dcf | 912 | if (p->spec.privtag) xfree(p->spec.privtag); |
c8e02c8a MW |
913 | tidy_1: |
914 | sym_remove(&byname, p->byname); | |
410c8acf | 915 | tidy_0: |
410c8acf | 916 | DESTROY(p); |
917 | return (0); | |
918 | } | |
919 | ||
920 | /* --- @p_name@ --- * | |
921 | * | |
922 | * Arguments: @peer *p@ = pointer to a peer block | |
923 | * | |
924 | * Returns: A pointer to the peer's name. | |
925 | */ | |
926 | ||
6411163d MW |
927 | const char *p_name(peer *p) |
928 | { if (p) return (p->spec.name); else return ("-"); } | |
410c8acf | 929 | |
48b84569 MW |
930 | /* --- @p_tag@ --- * |
931 | * | |
932 | * Arguments: @peer *p@ = pointer to a peer block | |
933 | * | |
934 | * Returns: A pointer to the peer's public key tag. | |
935 | */ | |
936 | ||
937 | const char *p_tag(peer *p) | |
938 | { return (p->spec.tag ? p->spec.tag : p->spec.name); } | |
939 | ||
fe2a5dcf MW |
940 | /* --- @p_privtag@ --- * |
941 | * | |
942 | * Arguments: @peer *p@ = pointer to a peer block | |
943 | * | |
944 | * Returns: A pointer to the peer's private key tag. | |
945 | */ | |
946 | ||
947 | const char *p_privtag(peer *p) | |
948 | { return (p->spec.privtag ? p->spec.privtag : tag_priv); } | |
949 | ||
060ca767 | 950 | /* --- @p_spec@ --- * |
951 | * | |
952 | * Arguments: @peer *p@ = pointer to a peer block | |
953 | * | |
954 | * Returns: Pointer to the peer's specification | |
955 | */ | |
956 | ||
957 | const peerspec *p_spec(peer *p) { return (&p->spec); } | |
958 | ||
c8e02c8a MW |
959 | /* --- @p_findbyaddr@ --- * |
960 | * | |
961 | * Arguments: @const addr *a@ = address to look up | |
962 | * | |
963 | * Returns: Pointer to the peer block, or null if not found. | |
964 | * | |
965 | * Use: Finds a peer by address. | |
966 | */ | |
967 | ||
968 | peer *p_findbyaddr(const addr *a) | |
969 | { | |
970 | peer_byaddr *pa; | |
971 | ||
6411163d MW |
972 | if ((pa = am_find(&byaddr, a, 0, 0)) != 0) { |
973 | assert(pa->p); | |
c8e02c8a | 974 | return (pa->p); |
6411163d | 975 | } |
c8e02c8a MW |
976 | return (0); |
977 | } | |
978 | ||
410c8acf | 979 | /* --- @p_find@ --- * |
980 | * | |
981 | * Arguments: @const char *name@ = name to look up | |
982 | * | |
983 | * Returns: Pointer to the peer block, or null if not found. | |
984 | * | |
985 | * Use: Finds a peer by name. | |
986 | */ | |
987 | ||
988 | peer *p_find(const char *name) | |
989 | { | |
c8e02c8a MW |
990 | peer_byname *pn; |
991 | ||
992 | if ((pn = sym_find(&byname, name, -1, 0, 0)) != 0) | |
993 | return (pn->p); | |
e04c2d50 | 994 | return (0); |
410c8acf | 995 | } |
996 | ||
997 | /* --- @p_destroy@ --- * | |
998 | * | |
999 | * Arguments: @peer *p@ = pointer to a peer | |
1000 | * | |
1001 | * Returns: --- | |
1002 | * | |
1003 | * Use: Destroys a peer. | |
1004 | */ | |
1005 | ||
1006 | void p_destroy(peer *p) | |
1007 | { | |
0ba8de86 | 1008 | ping *pg, *ppg; |
1009 | ||
1010 | T( trace(T_PEER, "peer: destroying peer `%s'", p->spec.name); ) | |
f43df819 | 1011 | a_notify("KILL", "%s", p->spec.name, A_END); |
5bb41301 | 1012 | ksl_free(&p->ks); |
410c8acf | 1013 | kx_free(&p->kx); |
fe2a5dcf MW |
1014 | if (p->spec.f & PSF_MOBILE) nmobile--; |
1015 | if (p->ifname) xfree(p->ifname); | |
1016 | if (p->spec.tag) xfree(p->spec.tag); | |
1017 | if (p->spec.privtag) xfree(p->spec.privtag); | |
42da2a58 | 1018 | p->t->ops->destroy(p->t); |
fe2a5dcf | 1019 | if (p->spec.t_ka) sel_rmtimer(&p->tka); |
0ba8de86 | 1020 | for (pg = p->pings; pg; pg = ppg) { |
1021 | ppg = pg->next; | |
1022 | p_pingdone(pg, PING_PEERDIED); | |
1023 | } | |
c8e02c8a MW |
1024 | sym_remove(&byname, p->byname); |
1025 | am_remove(&byaddr, p->byaddr); | |
410c8acf | 1026 | DESTROY(p); |
1027 | } | |
1028 | ||
c8e02c8a MW |
1029 | /* --- @p_mkiter@ --- * |
1030 | * | |
1031 | * Arguments: @peer_iter *i@ = pointer to an iterator | |
1032 | * | |
1033 | * Returns: --- | |
1034 | * | |
1035 | * Use: Initializes the iterator. | |
1036 | */ | |
1037 | ||
1038 | void p_mkiter(peer_iter *i) { sym_mkiter(&i->i, &byname); } | |
1039 | ||
1040 | /* --- @p_next@ --- * | |
1041 | * | |
1042 | * Arguments: @peer_iter *i@ = pointer to an iterator | |
410c8acf | 1043 | * |
c8e02c8a | 1044 | * Returns: Next peer, or null if at the end. |
410c8acf | 1045 | * |
c8e02c8a | 1046 | * Use: Returns the next peer. |
410c8acf | 1047 | */ |
1048 | ||
c8e02c8a MW |
1049 | peer *p_next(peer_iter *i) |
1050 | { | |
1051 | peer_byname *pn; | |
1052 | ||
1053 | if ((pn = sym_next(&i->i)) == 0) | |
1054 | return (0); | |
1055 | return (pn->p); | |
1056 | } | |
410c8acf | 1057 | |
1058 | /*----- That's all, folks -------------------------------------------------*/ |