Commit | Line | Data |
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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 | * | |
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 | ||
23bbe601 MW |
169 | /* --- @p_updateaddr@ --- * |
170 | * | |
171 | * Arguments: @peer *p@ = pointer to peer block | |
172 | * @const addr *a@ = address to associate with this peer | |
173 | * | |
174 | * Returns: Zero if the address was changed; @+1@ if it was already | |
175 | * right. | |
176 | * | |
177 | * Use: Updates our idea of @p@'s address. | |
178 | */ | |
179 | ||
180 | int p_updateaddr(peer *p, const addr *a) | |
181 | { | |
182 | peer *q; | |
183 | peer_byaddr *pa, *qa; | |
184 | unsigned f; | |
185 | ||
186 | /* --- Figure out how to proceed --- * | |
187 | * | |
188 | * If this address already belongs to a different peer, then swap the | |
189 | * addresses over. This doesn't leave the displaced peer in an especially | |
190 | * good state, but it ought to get sorted out soon enough. | |
191 | */ | |
192 | ||
193 | pa = am_find(&byaddr, a, sizeof(peer_byaddr), &f); | |
194 | if (f && pa->p == p) | |
195 | return (+1); | |
196 | else if (!f) { | |
197 | T( trace(T_PEER, "peer: updating address for `%s'", p_name(p)); ) | |
198 | am_remove(&byaddr, p->byaddr); | |
199 | p->byaddr = pa; p->spec.sa = *a; pa->p = p; | |
200 | a_notify("NEWADDR", "?PEER", p, "?ADDR", a, A_END); | |
201 | return (0); | |
202 | } else { | |
203 | q = pa->p; qa = p->byaddr; | |
204 | T( trace(T_PEER, "peer: swapping addresses for `%s' and `%s'", | |
205 | p_name(p), p_name(q)); ) | |
206 | q->byaddr = qa; qa->p = q; q->spec.sa = p->spec.sa; | |
207 | p->byaddr = pa; pa->p = p; p->spec.sa = *a; | |
208 | a_notify("NEWADDR", "?PEER", p, "?ADDR", a, A_END); | |
209 | a_notify("NEWADDR", "?PEER", q, "?ADDR", &q->spec.sa, A_END); | |
210 | return (0); | |
211 | } | |
212 | } | |
213 | ||
a50f9a0e MW |
214 | /* --- @p_decrypt@ --- * |
215 | * | |
6411163d MW |
216 | * Arguments: @peer **pp@ = pointer to peer to decrypt message from |
217 | * @addr *a@ = address the packet arrived on | |
218 | * @size_t n@ = size of original incoming packet | |
a50f9a0e MW |
219 | * @int ty@ = message type to expect |
220 | * @buf *bin, *bout@ = input and output buffers | |
221 | * | |
222 | * Returns: Zero on success; nonzero on error. | |
223 | * | |
224 | * Use: Convenience function for packet decryption. Reports errors | |
225 | * and updates statistics appropriately. | |
6411163d MW |
226 | * |
227 | * If @*pp@ is null on entry and there are mobile peers then we | |
228 | * see if any of them can decrypt the packet. If so, we record | |
229 | * @*a@ as the peer's new address and send a notification. | |
a50f9a0e MW |
230 | */ |
231 | ||
6411163d MW |
232 | static int p_decrypt(peer **pp, addr *a, size_t n, |
233 | int ty, buf *bin, buf *bout) | |
a50f9a0e | 234 | { |
c71be758 | 235 | peer *p, *q; |
6411163d | 236 | int err = KSERR_DECRYPT; |
6411163d | 237 | |
c71be758 MW |
238 | /* --- If we have a match on the source address then try that first --- */ |
239 | ||
240 | q = *pp; | |
241 | if (q) { | |
6411163d | 242 | T( trace(T_PEER, "peer: decrypting packet from known peer `%s'", |
c71be758 MW |
243 | p_name(q)); ) |
244 | if ((err = ksl_decrypt(&q->ks, ty, bin, bout)) != KSERR_DECRYPT || | |
245 | !(q->spec.f & PSF_MOBILE) || nmobile == 1) { | |
246 | p = q; | |
247 | goto match; | |
248 | } | |
73174919 | 249 | T( trace(T_PEER, "peer: failed to decrypt: try other mobile peers..."); ) |
c71be758 | 250 | } else if (nmobile) |
8ed35e02 | 251 | T( trace(T_PEER, "peer: unknown source: trying mobile peers...") ); |
c71be758 | 252 | else { |
6411163d | 253 | p = 0; |
c71be758 MW |
254 | goto searched; |
255 | } | |
256 | ||
257 | /* --- See whether any mobile peer is interested --- */ | |
258 | ||
01c21903 MW |
259 | p = 0; |
260 | FOREACH_PEER(qq, { | |
261 | if (qq == q || !(qq->spec.f & PSF_MOBILE)) continue; | |
262 | if ((err = ksl_decrypt(&qq->ks, ty, bin, bout)) == KSERR_DECRYPT) { | |
c71be758 | 263 | T( trace(T_PEER, "peer: peer `%s' failed to decrypt", |
01c21903 | 264 | p_name(qq)); ) |
c71be758 MW |
265 | continue; |
266 | } else { | |
01c21903 | 267 | p = qq; |
c71be758 MW |
268 | IF_TRACING(T_PEER, { |
269 | if (!err) | |
01c21903 | 270 | trace(T_PEER, "peer: peer `%s' reports success", p_name(qq)); |
c71be758 MW |
271 | else { |
272 | trace(T_PEER, "peer: peer `%s' reports decryption error %d", | |
01c21903 | 273 | p_name(qq), err); |
6411163d | 274 | } |
c71be758 MW |
275 | }) |
276 | break; | |
6411163d | 277 | } |
c71be758 MW |
278 | }); |
279 | ||
280 | /* --- We've searched the mobile peers --- */ | |
281 | ||
282 | searched: | |
283 | if (!p) { | |
01c21903 MW |
284 | if (!q) |
285 | a_warn("PEER", "-", "unexpected-source", "?ADDR", a, A_END); | |
286 | else { | |
287 | a_warn("PEER", "?PEER", p, "decrypt-failed", | |
288 | "error-code", "%d", err, A_END); | |
289 | p_rxupdstats(q, n); | |
290 | } | |
c71be758 MW |
291 | return (-1); |
292 | } | |
293 | ||
23bbe601 | 294 | /* --- We found one that accepted, so update the peer's address --- */ |
c71be758 MW |
295 | |
296 | if (!err) { | |
01c21903 | 297 | *pp = p; |
23bbe601 | 298 | p_updateaddr(p, a); |
6411163d | 299 | } |
c71be758 MW |
300 | |
301 | match: | |
88622d1d | 302 | p_rxupdstats(p, n); |
6411163d MW |
303 | if (err) { |
304 | if (p) p->st.n_reject++; | |
305 | a_warn("PEER", "?PEER", p, "decrypt-failed", | |
306 | "error-code", "%d", err, A_END); | |
a50f9a0e MW |
307 | return (-1); |
308 | } | |
309 | if (!BOK(bout)) | |
310 | return (-1); | |
311 | return (0); | |
312 | } | |
313 | ||
410c8acf | 314 | /* --- @p_read@ --- * |
315 | * | |
316 | * Arguments: @int fd@ = file descriptor to read from | |
317 | * @unsigned mode@ = what happened | |
318 | * @void *v@ = an uninteresting pointer | |
319 | * | |
320 | * Returns: --- | |
321 | * | |
322 | * Use: Reads a packet from somewhere. | |
323 | */ | |
324 | ||
325 | static void p_read(int fd, unsigned mode, void *v) | |
326 | { | |
37941236 | 327 | peer *p = 0; |
410c8acf | 328 | addr a; |
cb160b86 | 329 | socklen_t sz; |
410c8acf | 330 | ssize_t n; |
331 | int ch; | |
332 | buf b, bb; | |
333 | ||
334 | /* --- Read the data --- */ | |
335 | ||
f4c9c08f | 336 | QUICKRAND; |
410c8acf | 337 | sz = sizeof(addr); |
338 | n = recvfrom(fd, buf_i, sizeof(buf_i), 0, &a.sa, &sz); | |
339 | if (n < 0) { | |
f43df819 | 340 | a_warn("PEER", "-", "socket-read-error", "?ERRNO", A_END); |
410c8acf | 341 | return; |
342 | } | |
343 | ||
37941236 | 344 | /* --- If the packet is a greeting, don't check peers --- */ |
345 | ||
346 | if (n && buf_i[0] == (MSG_MISC | MISC_GREET)) { | |
347 | IF_TRACING(T_PEER, { | |
348 | trace(T_PEER, "peer: greeting received from INET %s %u", | |
349 | inet_ntoa(a.sin.sin_addr), | |
350 | (unsigned)ntohs(a.sin.sin_port)); | |
351 | trace_block(T_PACKET, "peer: greeting contents", buf_i, n); | |
352 | }) | |
353 | buf_init(&b, buf_i, n); | |
354 | buf_getbyte(&b); | |
3deadf73 | 355 | if (c_check(0, 0, &b) || BLEFT(&b)) { |
f43df819 | 356 | a_warn("PEER", "-", "invalid-greeting", A_END); |
37941236 | 357 | return; |
358 | } | |
f43df819 MW |
359 | a_notify("GREET", |
360 | "?B64", buf_i + 1, (size_t)(n - 1), | |
361 | "?ADDR", &a, | |
362 | A_END); | |
37941236 | 363 | return; |
364 | } | |
365 | ||
6411163d MW |
366 | /* --- Find the appropriate peer --- * |
367 | * | |
368 | * At this stage, don't worry too much about whether we actually found it. | |
369 | */ | |
410c8acf | 370 | |
6411163d | 371 | p = p_findbyaddr(&a); |
410c8acf | 372 | |
b9066fbb | 373 | IF_TRACING(T_PEER, { |
6411163d MW |
374 | if (p) { |
375 | trace(T_PEER, | |
376 | "peer: packet received from `%s' from address INET %s %d", | |
377 | p_name(p), inet_ntoa(a.sin.sin_addr), ntohs(a.sin.sin_port)); | |
378 | } else { | |
379 | trace(T_PEER, "peer: packet received from unknown address INET %s %d", | |
380 | inet_ntoa(a.sin.sin_addr), ntohs(a.sin.sin_port)); | |
381 | } | |
b9066fbb | 382 | trace_block(T_PACKET, "peer: packet contents", buf_i, n); |
383 | }) | |
410c8acf | 384 | |
385 | /* --- Pick the packet apart --- */ | |
386 | ||
387 | buf_init(&b, buf_i, n); | |
388 | if ((ch = buf_getbyte(&b)) < 0) { | |
f43df819 | 389 | a_warn("PEER", "?PEER", p, "bad-packet", "no-type", A_END); |
410c8acf | 390 | return; |
391 | } | |
5bb41301 | 392 | switch (ch & MSG_CATMASK) { |
410c8acf | 393 | case MSG_PACKET: |
5bb41301 | 394 | if (ch & MSG_TYPEMASK) { |
f43df819 MW |
395 | a_warn("PEER", |
396 | "?PEER", p, | |
397 | "bad-packet", | |
398 | "unknown-type", "0x%02x", ch, | |
399 | A_END); | |
6411163d | 400 | if (p) p->st.n_reject++; |
5bb41301 | 401 | return; |
402 | } | |
410c8acf | 403 | buf_init(&bb, buf_o, sizeof(buf_o)); |
6411163d | 404 | if (p_decrypt(&p, &a, n, MSG_PACKET, &b, &bb)) |
410c8acf | 405 | return; |
5bb41301 | 406 | if (BOK(&bb)) { |
407 | p->st.n_ipin++; | |
408 | p->st.sz_ipin += BSZ(&b); | |
42da2a58 | 409 | p->t->ops->inject(p->t, &bb); |
5bb41301 | 410 | } else { |
411 | p->st.n_reject++; | |
f43df819 | 412 | a_warn("PEER", "?PEER", p, "packet-build-failed", A_END); |
5bb41301 | 413 | } |
410c8acf | 414 | break; |
5bb41301 | 415 | case MSG_KEYEXCH: |
6411163d | 416 | if (!p) goto unexp; |
88622d1d | 417 | p_rxupdstats(p, n); |
5bb41301 | 418 | kx_message(&p->kx, ch & MSG_TYPEMASK, &b); |
410c8acf | 419 | break; |
0ba8de86 | 420 | case MSG_MISC: |
421 | switch (ch & MSG_TYPEMASK) { | |
422 | case MISC_NOP: | |
6411163d | 423 | if (!p) goto unexp; |
88622d1d | 424 | p_rxupdstats(p, n); |
0ba8de86 | 425 | T( trace(T_PEER, "peer: received NOP packet"); ) |
426 | break; | |
427 | case MISC_PING: | |
6411163d | 428 | if (!p) goto unexp; |
88622d1d | 429 | p_rxupdstats(p, n); |
0ba8de86 | 430 | buf_put(p_txstart(p, MSG_MISC | MISC_PONG), BCUR(&b), BLEFT(&b)); |
431 | p_txend(p); | |
e04c2d50 | 432 | break; |
0ba8de86 | 433 | case MISC_PONG: |
6411163d | 434 | if (!p) goto unexp; |
88622d1d | 435 | p_rxupdstats(p, n); |
0ba8de86 | 436 | p_ponged(p, MISC_PONG, &b); |
437 | break; | |
438 | case MISC_EPING: | |
439 | buf_init(&bb, buf_t, sizeof(buf_t)); | |
6411163d | 440 | if (p_decrypt(&p, &a, n, ch, &b, &bb)) |
0ba8de86 | 441 | return; |
0ba8de86 | 442 | if (BOK(&bb)) { |
443 | buf_flip(&bb); | |
a50f9a0e MW |
444 | p_encrypt(p, MSG_MISC | MISC_EPONG, &bb, |
445 | p_txstart(p, MSG_MISC | MISC_EPONG)); | |
0ba8de86 | 446 | p_txend(p); |
447 | } | |
448 | break; | |
449 | case MISC_EPONG: | |
450 | buf_init(&bb, buf_t, sizeof(buf_t)); | |
6411163d | 451 | if (p_decrypt(&p, &a, n, ch, &b, &bb)) |
0ba8de86 | 452 | return; |
0ba8de86 | 453 | if (BOK(&bb)) { |
454 | buf_flip(&bb); | |
455 | p_ponged(p, MISC_EPONG, &bb); | |
456 | } | |
457 | break; | |
458 | } | |
459 | break; | |
410c8acf | 460 | default: |
6411163d | 461 | if (p) p->st.n_reject++; |
f43df819 MW |
462 | a_warn("PEER", |
463 | "?PEER", p, | |
464 | "bad-packet", | |
a68280fc | 465 | "unknown-category", "0x%02x", ch, |
f43df819 | 466 | A_END); |
410c8acf | 467 | break; |
6411163d MW |
468 | unexp: |
469 | a_warn("PEER", "-", "unexpected-source", "?ADDR", &a, A_END); | |
470 | break; | |
410c8acf | 471 | } |
472 | } | |
473 | ||
474 | /* --- @p_txstart@ --- * | |
475 | * | |
476 | * Arguments: @peer *p@ = pointer to peer block | |
477 | * @unsigned msg@ = message type code | |
478 | * | |
479 | * Returns: A pointer to a buffer to write to. | |
480 | * | |
481 | * Use: Starts sending to a peer. Only one send can happen at a | |
482 | * time. | |
483 | */ | |
484 | ||
485 | buf *p_txstart(peer *p, unsigned msg) | |
486 | { | |
487 | buf_init(&p->b, buf_o, sizeof(buf_o)); | |
488 | buf_putbyte(&p->b, msg); | |
489 | return (&p->b); | |
490 | } | |
491 | ||
492 | /* --- @p_txend@ --- * | |
493 | * | |
494 | * Arguments: @peer *p@ = pointer to peer block | |
495 | * | |
496 | * Returns: --- | |
497 | * | |
498 | * Use: Sends a packet to the peer. | |
499 | */ | |
500 | ||
0ba8de86 | 501 | static void p_setkatimer(peer *); |
502 | ||
503 | static int p_dotxend(peer *p) | |
410c8acf | 504 | { |
cb2c2bfc MW |
505 | socklen_t sasz = addrsz(&p->spec.sa); |
506 | ||
410c8acf | 507 | if (!BOK(&p->b)) { |
f43df819 | 508 | a_warn("PEER", "?PEER", p, "packet-build-failed", A_END); |
0ba8de86 | 509 | return (0); |
410c8acf | 510 | } |
511 | IF_TRACING(T_PEER, trace_block(T_PACKET, "peer: sending packet", | |
512 | BBASE(&p->b), BLEN(&p->b)); ) | |
513 | if (sendto(sock.fd, BBASE(&p->b), BLEN(&p->b), | |
cb2c2bfc | 514 | 0, &p->spec.sa.sa, sasz) < 0) { |
f43df819 | 515 | a_warn("PEER", "?PEER", p, "socket-write-error", "?ERRNO", A_END); |
0ba8de86 | 516 | return (0); |
517 | } else { | |
5bb41301 | 518 | p->st.n_out++; |
519 | p->st.sz_out += BLEN(&p->b); | |
0ba8de86 | 520 | return (1); |
5bb41301 | 521 | } |
410c8acf | 522 | } |
523 | ||
0ba8de86 | 524 | void p_txend(peer *p) |
525 | { | |
526 | if (p_dotxend(p) && p->spec.t_ka) { | |
527 | sel_rmtimer(&p->tka); | |
528 | p_setkatimer(p); | |
529 | } | |
530 | } | |
531 | ||
532 | /* --- @p_pingwrite@ --- * | |
533 | * | |
534 | * Arguments: @ping *p@ = ping structure | |
535 | * @buf *b@ = buffer to write in | |
536 | * | |
537 | * Returns: --- | |
538 | * | |
539 | * Use: Fills in a ping structure and writes the packet payload. | |
540 | */ | |
541 | ||
542 | static void p_pingwrite(ping *p, buf *b) | |
543 | { | |
544 | static uint32 seq = 0; | |
545 | ||
546 | p->id = U32(seq++); | |
547 | GR_FILL(&rand_global, p->magic, sizeof(p->magic)); | |
548 | buf_putu32(b, p->id); | |
549 | buf_put(b, p->magic, sizeof(p->magic)); | |
550 | } | |
551 | ||
552 | /* --- @p_pingdone@ --- * | |
553 | * | |
554 | * Arguments: @ping *p@ = ping structure | |
555 | * @int rc@ = return code to pass on | |
556 | * | |
557 | * Returns: --- | |
558 | * | |
559 | * Use: Disposes of a ping structure, maybe sending a notification. | |
560 | */ | |
561 | ||
562 | void p_pingdone(ping *p, int rc) | |
563 | { | |
0ba8de86 | 564 | if (p->prev) p->prev->next = p->next; |
565 | else p->p->pings = p->next; | |
566 | if (p->next) p->next->prev = p->prev; | |
567 | if (rc != PING_TIMEOUT) sel_rmtimer(&p->t); | |
060ca767 | 568 | T( trace(T_PEER, "peer: ping 0x%08lx done (rc = %d)", |
569 | (unsigned long)p->id, rc); ) | |
0ba8de86 | 570 | if (rc >= 0) p->func(rc, p->arg); |
571 | } | |
572 | ||
573 | /* --- @p_pingtimeout@ --- * | |
574 | * | |
575 | * Arguments: @struct timeval *now@ = the time now | |
576 | * @void *pv@ = pointer to ping block | |
577 | * | |
578 | * Returns: --- | |
579 | * | |
580 | * Use: Called when a ping times out. | |
581 | */ | |
582 | ||
583 | static void p_pingtimeout(struct timeval *now, void *pv) | |
584 | { | |
585 | ping *p = pv; | |
586 | ||
587 | T( trace(T_PEER, "peer: ping 0x%08lx timed out", (unsigned long)p->id); ) | |
588 | p_pingdone(p, PING_TIMEOUT); | |
589 | } | |
590 | ||
591 | /* --- @p_pingsend@ --- * | |
592 | * | |
593 | * Arguments: @peer *p@ = destination peer | |
594 | * @ping *pg@ = structure to fill in | |
595 | * @unsigned type@ = message type | |
596 | * @unsigned long timeout@ = how long to wait before giving up | |
597 | * @void (*func)(int, void *)@ = callback function | |
598 | * @void *arg@ = argument for callback | |
599 | * | |
600 | * Returns: Zero if successful, nonzero if it failed. | |
601 | * | |
602 | * Use: Sends a ping to a peer. Call @func@ with a nonzero argument | |
603 | * if we get an answer within the timeout, or zero if no answer. | |
604 | */ | |
605 | ||
606 | int p_pingsend(peer *p, ping *pg, unsigned type, | |
607 | unsigned long timeout, | |
608 | void (*func)(int, void *), void *arg) | |
609 | { | |
610 | buf *b, bb; | |
611 | struct timeval tv; | |
612 | ||
0ba8de86 | 613 | switch (type) { |
614 | case MISC_PING: | |
615 | pg->msg = MISC_PONG; | |
616 | b = p_txstart(p, MSG_MISC | MISC_PING); | |
617 | p_pingwrite(pg, b); | |
618 | p_txend(p); | |
619 | break; | |
620 | case MISC_EPING: | |
621 | pg->msg = MISC_EPONG; | |
622 | b = p_txstart(p, MSG_MISC | MISC_EPING); | |
623 | buf_init(&bb, buf_t, sizeof(buf_t)); | |
624 | p_pingwrite(pg, &bb); | |
625 | buf_flip(&bb); | |
a50f9a0e | 626 | p_encrypt(p, MSG_MISC | MISC_EPING, &bb, b); |
0ba8de86 | 627 | if (!BOK(b)) |
628 | return (-1); | |
629 | p_txend(p); | |
630 | break; | |
631 | default: | |
632 | abort(); | |
633 | break; | |
634 | } | |
635 | ||
636 | pg->next = p->pings; | |
637 | pg->prev = 0; | |
638 | pg->p = p; | |
639 | pg->func = func; | |
640 | pg->arg = arg; | |
060ca767 | 641 | if (p->pings) p->pings->prev = pg; |
0ba8de86 | 642 | p->pings = pg; |
643 | gettimeofday(&tv, 0); | |
644 | tv.tv_sec += timeout; | |
645 | sel_addtimer(&sel, &pg->t, &tv, p_pingtimeout, pg); | |
646 | T( trace(T_PEER, "peer: send %s 0x%08lx to %s", | |
647 | p_pingtype(type), (unsigned long)pg->id, p->spec.name); ) | |
648 | return (0); | |
649 | } | |
650 | ||
37941236 | 651 | /* --- @p_greet@ --- * |
652 | * | |
653 | * Arguments: @peer *p@ = peer to send to | |
654 | * @const void *c@ = pointer to challenge | |
655 | * @size_t sz@ = size of challenge | |
656 | * | |
657 | * Returns: --- | |
658 | * | |
659 | * Use: Sends a greeting packet. | |
660 | */ | |
661 | ||
662 | void p_greet(peer *p, const void *c, size_t sz) | |
663 | { | |
664 | buf *b = p_txstart(p, MSG_MISC | MISC_GREET); | |
665 | buf_put(b, c, sz); | |
666 | p_txend(p); | |
667 | } | |
668 | ||
410c8acf | 669 | /* --- @p_tun@ --- * |
670 | * | |
671 | * Arguments: @peer *p@ = pointer to peer block | |
672 | * @buf *b@ = buffer containing incoming packet | |
673 | * | |
674 | * Returns: --- | |
675 | * | |
676 | * Use: Handles a packet which needs to be sent to a peer. | |
677 | */ | |
678 | ||
679 | void p_tun(peer *p, buf *b) | |
680 | { | |
681 | buf *bb = p_txstart(p, MSG_PACKET); | |
7b052fe6 | 682 | |
f4c9c08f | 683 | QUICKRAND; |
a50f9a0e | 684 | p_encrypt(p, MSG_PACKET, b, bb); |
5bb41301 | 685 | if (BOK(bb) && BLEN(bb)) { |
686 | p->st.n_ipout++; | |
687 | p->st.sz_ipout += BLEN(bb); | |
410c8acf | 688 | p_txend(p); |
5bb41301 | 689 | } |
410c8acf | 690 | } |
691 | ||
de014da6 | 692 | /* --- @p_keyreload@ --- * |
693 | * | |
694 | * Arguments: --- | |
695 | * | |
696 | * Returns: --- | |
697 | * | |
698 | * Use: Forces a check of the daemon's keyring files. | |
699 | */ | |
700 | ||
701 | void p_keyreload(void) | |
702 | { | |
c8e02c8a MW |
703 | if (km_reload()) |
704 | FOREACH_PEER(p, { kx_newkeys(&p->kx); }); | |
de014da6 | 705 | } |
706 | ||
410c8acf | 707 | /* --- @p_interval@ --- * |
708 | * | |
709 | * Arguments: --- | |
710 | * | |
711 | * Returns: --- | |
712 | * | |
713 | * Use: Called periodically to do tidying. | |
714 | */ | |
715 | ||
716 | void p_interval(void) | |
717 | { | |
de014da6 | 718 | p_keyreload(); |
c8e02c8a | 719 | FOREACH_PEER(p, { ksl_prune(&p->ks); }); |
410c8acf | 720 | } |
721 | ||
5bb41301 | 722 | /* --- @p_stats@ --- * |
723 | * | |
724 | * Arguments: @peer *p@ = pointer to a peer block | |
725 | * | |
726 | * Returns: A pointer to the peer's statistics. | |
727 | */ | |
728 | ||
729 | stats *p_stats(peer *p) { return (&p->st); } | |
730 | ||
410c8acf | 731 | /* --- @p_ifname@ --- * |
732 | * | |
733 | * Arguments: @peer *p@ = pointer to a peer block | |
734 | * | |
735 | * Returns: A pointer to the peer's interface name. | |
736 | */ | |
737 | ||
64cf2223 MW |
738 | const char *p_ifname(peer *p) { return (p->ifname); } |
739 | ||
740 | /* --- @p_setifname@ --- * | |
741 | * | |
742 | * Arguments: @peer *p@ = pointer to a peer block | |
743 | * @const char *name@ = pointer to the new name | |
744 | * | |
745 | * Returns: --- | |
746 | * | |
747 | * Use: Changes the name held for a peer's interface. | |
748 | */ | |
749 | ||
750 | void p_setifname(peer *p, const char *name) | |
72917fe7 MW |
751 | { |
752 | xfree(p->ifname); | |
753 | p->ifname = xstrdup(name); | |
754 | if (p->spec.tops->setifname) | |
755 | p->spec.tops->setifname(p->t, name); | |
756 | } | |
410c8acf | 757 | |
758 | /* --- @p_addr@ --- * | |
759 | * | |
760 | * Arguments: @peer *p@ = pointer to a peer block | |
761 | * | |
762 | * Returns: A pointer to the peer's address. | |
763 | */ | |
764 | ||
0ba8de86 | 765 | const addr *p_addr(peer *p) { return (&p->spec.sa); } |
410c8acf | 766 | |
767 | /* --- @p_init@ --- * | |
768 | * | |
767b36e2 | 769 | * Arguments: @struct in_addr addr@ = address to bind to |
770 | * @unsigned port@ = port number to listen to | |
410c8acf | 771 | * |
772 | * Returns: --- | |
773 | * | |
774 | * Use: Initializes the peer system; creates the socket. | |
775 | */ | |
776 | ||
767b36e2 | 777 | void p_init(struct in_addr addr, unsigned port) |
410c8acf | 778 | { |
779 | int fd; | |
780 | struct sockaddr_in sin; | |
df9dfccf | 781 | int len = PKBUFSZ; |
0a9920e2 | 782 | |
783 | /* --- Note on socket buffer sizes --- * | |
784 | * | |
785 | * For some bizarre reason, Linux 2.2 (at least) doubles the socket buffer | |
786 | * sizes I pass to @setsockopt@. I'm not putting special-case code here | |
787 | * for Linux: BSD (at least TCPv2) does what I tell it rather than second- | |
788 | * guessing me. | |
789 | */ | |
410c8acf | 790 | |
791 | if ((fd = socket(PF_INET, SOCK_DGRAM, 0)) < 0) | |
792 | die(EXIT_FAILURE, "socket creation failed: %s", strerror(errno)); | |
793 | BURN(sin); | |
794 | sin.sin_family = AF_INET; | |
767b36e2 | 795 | sin.sin_addr = addr; |
410c8acf | 796 | sin.sin_port = htons(port); |
797 | if (bind(fd, (struct sockaddr *)&sin, sizeof(sin))) | |
798 | die(EXIT_FAILURE, "bind failed: %s", strerror(errno)); | |
0a9920e2 | 799 | if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, sizeof(len)) || |
800 | setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &len, sizeof(len))) { | |
801 | die(EXIT_FAILURE, "failed to set socket buffer sizes: %s", | |
802 | strerror(errno)); | |
803 | } | |
650a6624 | 804 | fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC); |
410c8acf | 805 | sel_initfile(&sel, &sock, fd, SEL_READ, p_read, 0); |
806 | sel_addfile(&sock); | |
807 | T( trace(T_PEER, "peer: created socket"); ) | |
c8e02c8a MW |
808 | |
809 | sym_create(&byname); | |
810 | am_create(&byaddr); | |
410c8acf | 811 | } |
812 | ||
813 | /* --- @p_port@ --- * | |
814 | * | |
815 | * Arguments: --- | |
816 | * | |
817 | * Returns: Port number used for socket. | |
818 | */ | |
819 | ||
820 | unsigned p_port(void) | |
821 | { | |
822 | addr a; | |
cb160b86 | 823 | socklen_t sz = sizeof(addr); |
410c8acf | 824 | |
825 | if (getsockname(sock.fd, &a.sa, &sz)) | |
826 | die(EXIT_FAILURE, "couldn't read port number: %s", strerror(errno)); | |
827 | assert(a.sa.sa_family == AF_INET); | |
828 | return (ntohs(a.sin.sin_port)); | |
829 | } | |
830 | ||
0ba8de86 | 831 | /* --- @p_keepalive@ --- * |
832 | * | |
833 | * Arguments: @struct timeval *now@ = the current time | |
834 | * @void *pv@ = peer to wake up | |
835 | * | |
836 | * Returns: --- | |
837 | * | |
838 | * Use: Sends a keepalive ping message to its peer. | |
839 | */ | |
840 | ||
841 | static void p_keepalive(struct timeval *now, void *pv) | |
842 | { | |
843 | peer *p = pv; | |
fe2a5dcf | 844 | |
0ba8de86 | 845 | p_txstart(p, MSG_MISC | MISC_NOP); p_dotxend(p); |
846 | T( trace(T_PEER, "peer: sent keepalive to %s", p->spec.name); ) | |
847 | p_setkatimer(p); | |
848 | } | |
849 | ||
850 | /* --- @p_setkatimer@ --- * | |
851 | * | |
852 | * Arguments: @peer *p@ = peer to set | |
853 | * | |
854 | * Returns: --- | |
855 | * | |
856 | * Use: Resets the keepalive timer thing. | |
857 | */ | |
858 | ||
859 | static void p_setkatimer(peer *p) | |
860 | { | |
861 | struct timeval tv; | |
862 | ||
863 | if (!p->spec.t_ka) | |
864 | return; | |
865 | gettimeofday(&tv, 0); | |
866 | tv.tv_sec += p->spec.t_ka; | |
867 | sel_addtimer(&sel, &p->tka, &tv, p_keepalive, p); | |
868 | } | |
869 | ||
410c8acf | 870 | /* --- @p_create@ --- * |
871 | * | |
0ba8de86 | 872 | * Arguments: @peerspec *spec@ = information about this peer |
410c8acf | 873 | * |
874 | * Returns: Pointer to the peer block, or null if it failed. | |
875 | * | |
876 | * Use: Creates a new named peer block. No peer is actually attached | |
877 | * by this point. | |
878 | */ | |
879 | ||
0ba8de86 | 880 | peer *p_create(peerspec *spec) |
410c8acf | 881 | { |
882 | peer *p = CREATE(peer); | |
eb5f3fea MW |
883 | const tunnel_ops *tops = spec->tops; |
884 | int fd; | |
c8e02c8a MW |
885 | unsigned f; |
886 | ||
887 | p->byname = sym_find(&byname, spec->name, -1, sizeof(peer_byname), &f); | |
888 | if (f) goto tidy_0; | |
889 | p->byaddr = am_find(&byaddr, &spec->sa, sizeof(peer_byaddr), &f); | |
890 | if (f) goto tidy_1; | |
891 | p->byname->p = p->byaddr->p = p; | |
42da2a58 | 892 | |
0ba8de86 | 893 | T( trace(T_PEER, "peer: creating new peer `%s'", spec->name); ) |
894 | p->spec = *spec; | |
c8e02c8a | 895 | p->spec.name = (/*unconst*/ char *)SYM_NAME(p->byname); |
fe2a5dcf MW |
896 | if (spec->tag) p->spec.tag = xstrdup(spec->tag); |
897 | if (spec->privtag) p->spec.privtag = xstrdup(spec->privtag); | |
410c8acf | 898 | p->ks = 0; |
629842d8 | 899 | p->pings = 0; |
64cf2223 | 900 | p->ifname = 0; |
5bb41301 | 901 | memset(&p->st, 0, sizeof(stats)); |
902 | p->st.t_start = time(0); | |
388e0319 | 903 | if (!(tops->flags & TUNF_PRIVOPEN)) |
eb5f3fea | 904 | fd = -1; |
388e0319 | 905 | else if ((fd = ps_tunfd(tops, &p->ifname)) < 0) |
c8e02c8a | 906 | goto tidy_2; |
eb5f3fea MW |
907 | if ((p->t = tops->create(p, fd, &p->ifname)) == 0) |
908 | goto tidy_3; | |
909 | T( trace(T_TUNNEL, "peer: attached interface %s to peer `%s'", | |
910 | p->ifname, p_name(p)); ) | |
0ba8de86 | 911 | p_setkatimer(p); |
0510f262 | 912 | if (kx_setup(&p->kx, p, &p->ks, p->spec.f & PSF_KXMASK)) |
eb5f3fea | 913 | goto tidy_4; |
f43df819 | 914 | a_notify("ADD", |
6047fbac MW |
915 | "?PEER", p, |
916 | "%s", p->ifname, | |
917 | "?ADDR", &p->spec.sa, | |
918 | A_END); | |
8743c776 | 919 | if (!(p->spec.f & KXF_CORK)) { |
010e6f63 | 920 | a_notify("KXSTART", "?PEER", p, A_END); |
f43df819 | 921 | /* Couldn't tell anyone before */ |
010e6f63 | 922 | } |
6411163d | 923 | if (p->spec.f & PSF_MOBILE) nmobile++; |
410c8acf | 924 | return (p); |
925 | ||
eb5f3fea | 926 | tidy_4: |
fe2a5dcf | 927 | if (spec->t_ka) sel_rmtimer(&p->tka); |
72917fe7 | 928 | xfree(p->ifname); |
0ba8de86 | 929 | p->t->ops->destroy(p->t); |
eb5f3fea MW |
930 | tidy_3: |
931 | if (fd >= 0) close(fd); | |
c8e02c8a MW |
932 | tidy_2: |
933 | am_remove(&byaddr, p->byaddr); | |
48b84569 | 934 | if (p->spec.tag) xfree(p->spec.tag); |
fe2a5dcf | 935 | if (p->spec.privtag) xfree(p->spec.privtag); |
c8e02c8a MW |
936 | tidy_1: |
937 | sym_remove(&byname, p->byname); | |
410c8acf | 938 | tidy_0: |
410c8acf | 939 | DESTROY(p); |
940 | return (0); | |
941 | } | |
942 | ||
943 | /* --- @p_name@ --- * | |
944 | * | |
945 | * Arguments: @peer *p@ = pointer to a peer block | |
946 | * | |
947 | * Returns: A pointer to the peer's name. | |
948 | */ | |
949 | ||
6411163d MW |
950 | const char *p_name(peer *p) |
951 | { if (p) return (p->spec.name); else return ("-"); } | |
410c8acf | 952 | |
48b84569 MW |
953 | /* --- @p_tag@ --- * |
954 | * | |
955 | * Arguments: @peer *p@ = pointer to a peer block | |
956 | * | |
957 | * Returns: A pointer to the peer's public key tag. | |
958 | */ | |
959 | ||
960 | const char *p_tag(peer *p) | |
961 | { return (p->spec.tag ? p->spec.tag : p->spec.name); } | |
962 | ||
fe2a5dcf MW |
963 | /* --- @p_privtag@ --- * |
964 | * | |
965 | * Arguments: @peer *p@ = pointer to a peer block | |
966 | * | |
967 | * Returns: A pointer to the peer's private key tag. | |
968 | */ | |
969 | ||
970 | const char *p_privtag(peer *p) | |
971 | { return (p->spec.privtag ? p->spec.privtag : tag_priv); } | |
972 | ||
060ca767 | 973 | /* --- @p_spec@ --- * |
974 | * | |
975 | * Arguments: @peer *p@ = pointer to a peer block | |
976 | * | |
977 | * Returns: Pointer to the peer's specification | |
978 | */ | |
979 | ||
980 | const peerspec *p_spec(peer *p) { return (&p->spec); } | |
981 | ||
c8e02c8a MW |
982 | /* --- @p_findbyaddr@ --- * |
983 | * | |
984 | * Arguments: @const addr *a@ = address to look up | |
985 | * | |
986 | * Returns: Pointer to the peer block, or null if not found. | |
987 | * | |
988 | * Use: Finds a peer by address. | |
989 | */ | |
990 | ||
991 | peer *p_findbyaddr(const addr *a) | |
992 | { | |
993 | peer_byaddr *pa; | |
994 | ||
6411163d MW |
995 | if ((pa = am_find(&byaddr, a, 0, 0)) != 0) { |
996 | assert(pa->p); | |
c8e02c8a | 997 | return (pa->p); |
6411163d | 998 | } |
c8e02c8a MW |
999 | return (0); |
1000 | } | |
1001 | ||
410c8acf | 1002 | /* --- @p_find@ --- * |
1003 | * | |
1004 | * Arguments: @const char *name@ = name to look up | |
1005 | * | |
1006 | * Returns: Pointer to the peer block, or null if not found. | |
1007 | * | |
1008 | * Use: Finds a peer by name. | |
1009 | */ | |
1010 | ||
1011 | peer *p_find(const char *name) | |
1012 | { | |
c8e02c8a MW |
1013 | peer_byname *pn; |
1014 | ||
1015 | if ((pn = sym_find(&byname, name, -1, 0, 0)) != 0) | |
1016 | return (pn->p); | |
e04c2d50 | 1017 | return (0); |
410c8acf | 1018 | } |
1019 | ||
1020 | /* --- @p_destroy@ --- * | |
1021 | * | |
1022 | * Arguments: @peer *p@ = pointer to a peer | |
1023 | * | |
1024 | * Returns: --- | |
1025 | * | |
1026 | * Use: Destroys a peer. | |
1027 | */ | |
1028 | ||
1029 | void p_destroy(peer *p) | |
1030 | { | |
0ba8de86 | 1031 | ping *pg, *ppg; |
1032 | ||
1033 | T( trace(T_PEER, "peer: destroying peer `%s'", p->spec.name); ) | |
f43df819 | 1034 | a_notify("KILL", "%s", p->spec.name, A_END); |
5bb41301 | 1035 | ksl_free(&p->ks); |
410c8acf | 1036 | kx_free(&p->kx); |
fe2a5dcf MW |
1037 | if (p->spec.f & PSF_MOBILE) nmobile--; |
1038 | if (p->ifname) xfree(p->ifname); | |
1039 | if (p->spec.tag) xfree(p->spec.tag); | |
1040 | if (p->spec.privtag) xfree(p->spec.privtag); | |
42da2a58 | 1041 | p->t->ops->destroy(p->t); |
fe2a5dcf | 1042 | if (p->spec.t_ka) sel_rmtimer(&p->tka); |
0ba8de86 | 1043 | for (pg = p->pings; pg; pg = ppg) { |
1044 | ppg = pg->next; | |
1045 | p_pingdone(pg, PING_PEERDIED); | |
1046 | } | |
c8e02c8a MW |
1047 | sym_remove(&byname, p->byname); |
1048 | am_remove(&byaddr, p->byaddr); | |
410c8acf | 1049 | DESTROY(p); |
1050 | } | |
1051 | ||
c8e02c8a MW |
1052 | /* --- @p_mkiter@ --- * |
1053 | * | |
1054 | * Arguments: @peer_iter *i@ = pointer to an iterator | |
1055 | * | |
1056 | * Returns: --- | |
1057 | * | |
1058 | * Use: Initializes the iterator. | |
1059 | */ | |
1060 | ||
1061 | void p_mkiter(peer_iter *i) { sym_mkiter(&i->i, &byname); } | |
1062 | ||
1063 | /* --- @p_next@ --- * | |
1064 | * | |
1065 | * Arguments: @peer_iter *i@ = pointer to an iterator | |
410c8acf | 1066 | * |
c8e02c8a | 1067 | * Returns: Next peer, or null if at the end. |
410c8acf | 1068 | * |
c8e02c8a | 1069 | * Use: Returns the next peer. |
410c8acf | 1070 | */ |
1071 | ||
c8e02c8a MW |
1072 | peer *p_next(peer_iter *i) |
1073 | { | |
1074 | peer_byname *pn; | |
1075 | ||
1076 | if ((pn = sym_next(&i->i)) == 0) | |
1077 | return (0); | |
1078 | return (pn->p); | |
1079 | } | |
410c8acf | 1080 | |
1081 | /*----- That's all, folks -------------------------------------------------*/ |