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 | ||
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: |
f6994bd0 MW |
416 | if (p) p_rxupdstats(p, n); |
417 | if (kx_message(p ? &p->kx : 0, &a, ch & MSG_TYPEMASK, &b)) goto unexp; | |
410c8acf | 418 | break; |
0ba8de86 | 419 | case MSG_MISC: |
420 | switch (ch & MSG_TYPEMASK) { | |
421 | case MISC_NOP: | |
6411163d | 422 | if (!p) goto unexp; |
88622d1d | 423 | p_rxupdstats(p, n); |
0ba8de86 | 424 | T( trace(T_PEER, "peer: received NOP packet"); ) |
425 | break; | |
426 | case MISC_PING: | |
6411163d | 427 | if (!p) goto unexp; |
88622d1d | 428 | p_rxupdstats(p, n); |
0ba8de86 | 429 | buf_put(p_txstart(p, MSG_MISC | MISC_PONG), BCUR(&b), BLEFT(&b)); |
430 | p_txend(p); | |
e04c2d50 | 431 | break; |
0ba8de86 | 432 | case MISC_PONG: |
6411163d | 433 | if (!p) goto unexp; |
88622d1d | 434 | p_rxupdstats(p, n); |
0ba8de86 | 435 | p_ponged(p, MISC_PONG, &b); |
436 | break; | |
437 | case MISC_EPING: | |
438 | buf_init(&bb, buf_t, sizeof(buf_t)); | |
6411163d | 439 | if (p_decrypt(&p, &a, n, ch, &b, &bb)) |
0ba8de86 | 440 | return; |
0ba8de86 | 441 | if (BOK(&bb)) { |
442 | buf_flip(&bb); | |
a50f9a0e MW |
443 | p_encrypt(p, MSG_MISC | MISC_EPONG, &bb, |
444 | p_txstart(p, MSG_MISC | MISC_EPONG)); | |
0ba8de86 | 445 | p_txend(p); |
446 | } | |
447 | break; | |
448 | case MISC_EPONG: | |
449 | buf_init(&bb, buf_t, sizeof(buf_t)); | |
6411163d | 450 | if (p_decrypt(&p, &a, n, ch, &b, &bb)) |
0ba8de86 | 451 | return; |
0ba8de86 | 452 | if (BOK(&bb)) { |
453 | buf_flip(&bb); | |
454 | p_ponged(p, MISC_EPONG, &bb); | |
455 | } | |
456 | break; | |
457 | } | |
458 | break; | |
410c8acf | 459 | default: |
6411163d | 460 | if (p) p->st.n_reject++; |
f43df819 MW |
461 | a_warn("PEER", |
462 | "?PEER", p, | |
463 | "bad-packet", | |
a68280fc | 464 | "unknown-category", "0x%02x", ch, |
f43df819 | 465 | A_END); |
410c8acf | 466 | break; |
6411163d MW |
467 | unexp: |
468 | a_warn("PEER", "-", "unexpected-source", "?ADDR", &a, A_END); | |
469 | break; | |
410c8acf | 470 | } |
471 | } | |
472 | ||
473 | /* --- @p_txstart@ --- * | |
474 | * | |
475 | * Arguments: @peer *p@ = pointer to peer block | |
476 | * @unsigned msg@ = message type code | |
477 | * | |
478 | * Returns: A pointer to a buffer to write to. | |
479 | * | |
480 | * Use: Starts sending to a peer. Only one send can happen at a | |
481 | * time. | |
482 | */ | |
483 | ||
484 | buf *p_txstart(peer *p, unsigned msg) | |
485 | { | |
486 | buf_init(&p->b, buf_o, sizeof(buf_o)); | |
487 | buf_putbyte(&p->b, msg); | |
488 | return (&p->b); | |
489 | } | |
490 | ||
8362ac1c MW |
491 | /* --- @p_txaddr@ --- * |
492 | * | |
493 | * Arguments: @const addr *a@ = recipient address | |
494 | * @const void *p@ = pointer to packet to send | |
495 | * @size_t sz@ = length of packet | |
496 | * | |
497 | * Returns: Zero if successful, nonzero on error. | |
498 | * | |
499 | * Use: Sends a packet to an address which (possibly) isn't a current | |
500 | * peer. | |
501 | */ | |
502 | ||
503 | int p_txaddr(const addr *a, const void *p, size_t sz) | |
504 | { | |
505 | socklen_t sasz = addrsz(a); | |
506 | ||
507 | IF_TRACING(T_PEER, trace_block(T_PACKET, "peer: sending packet", p, sz); ) | |
508 | if (sendto(sock.fd, p, sz, 0, &a->sa, sasz) < 0) { | |
509 | a_warn("PEER", "?ADDR", a, "socket-write-error", "?ERRNO", A_END); | |
510 | return (-1); | |
511 | } | |
512 | return (0); | |
513 | } | |
514 | ||
410c8acf | 515 | /* --- @p_txend@ --- * |
516 | * | |
517 | * Arguments: @peer *p@ = pointer to peer block | |
518 | * | |
519 | * Returns: --- | |
520 | * | |
521 | * Use: Sends a packet to the peer. | |
522 | */ | |
523 | ||
0ba8de86 | 524 | static void p_setkatimer(peer *); |
525 | ||
526 | static int p_dotxend(peer *p) | |
410c8acf | 527 | { |
cb2c2bfc MW |
528 | socklen_t sasz = addrsz(&p->spec.sa); |
529 | ||
410c8acf | 530 | if (!BOK(&p->b)) { |
f43df819 | 531 | a_warn("PEER", "?PEER", p, "packet-build-failed", A_END); |
0ba8de86 | 532 | return (0); |
410c8acf | 533 | } |
534 | IF_TRACING(T_PEER, trace_block(T_PACKET, "peer: sending packet", | |
535 | BBASE(&p->b), BLEN(&p->b)); ) | |
536 | if (sendto(sock.fd, BBASE(&p->b), BLEN(&p->b), | |
cb2c2bfc | 537 | 0, &p->spec.sa.sa, sasz) < 0) { |
f43df819 | 538 | a_warn("PEER", "?PEER", p, "socket-write-error", "?ERRNO", A_END); |
0ba8de86 | 539 | return (0); |
540 | } else { | |
5bb41301 | 541 | p->st.n_out++; |
542 | p->st.sz_out += BLEN(&p->b); | |
0ba8de86 | 543 | return (1); |
5bb41301 | 544 | } |
410c8acf | 545 | } |
546 | ||
0ba8de86 | 547 | void p_txend(peer *p) |
548 | { | |
549 | if (p_dotxend(p) && p->spec.t_ka) { | |
550 | sel_rmtimer(&p->tka); | |
551 | p_setkatimer(p); | |
552 | } | |
553 | } | |
554 | ||
555 | /* --- @p_pingwrite@ --- * | |
556 | * | |
557 | * Arguments: @ping *p@ = ping structure | |
558 | * @buf *b@ = buffer to write in | |
559 | * | |
560 | * Returns: --- | |
561 | * | |
562 | * Use: Fills in a ping structure and writes the packet payload. | |
563 | */ | |
564 | ||
565 | static void p_pingwrite(ping *p, buf *b) | |
566 | { | |
567 | static uint32 seq = 0; | |
568 | ||
569 | p->id = U32(seq++); | |
570 | GR_FILL(&rand_global, p->magic, sizeof(p->magic)); | |
571 | buf_putu32(b, p->id); | |
572 | buf_put(b, p->magic, sizeof(p->magic)); | |
573 | } | |
574 | ||
575 | /* --- @p_pingdone@ --- * | |
576 | * | |
577 | * Arguments: @ping *p@ = ping structure | |
578 | * @int rc@ = return code to pass on | |
579 | * | |
580 | * Returns: --- | |
581 | * | |
582 | * Use: Disposes of a ping structure, maybe sending a notification. | |
583 | */ | |
584 | ||
585 | void p_pingdone(ping *p, int rc) | |
586 | { | |
0ba8de86 | 587 | if (p->prev) p->prev->next = p->next; |
588 | else p->p->pings = p->next; | |
589 | if (p->next) p->next->prev = p->prev; | |
590 | if (rc != PING_TIMEOUT) sel_rmtimer(&p->t); | |
060ca767 | 591 | T( trace(T_PEER, "peer: ping 0x%08lx done (rc = %d)", |
592 | (unsigned long)p->id, rc); ) | |
0ba8de86 | 593 | if (rc >= 0) p->func(rc, p->arg); |
594 | } | |
595 | ||
596 | /* --- @p_pingtimeout@ --- * | |
597 | * | |
598 | * Arguments: @struct timeval *now@ = the time now | |
599 | * @void *pv@ = pointer to ping block | |
600 | * | |
601 | * Returns: --- | |
602 | * | |
603 | * Use: Called when a ping times out. | |
604 | */ | |
605 | ||
606 | static void p_pingtimeout(struct timeval *now, void *pv) | |
607 | { | |
608 | ping *p = pv; | |
609 | ||
610 | T( trace(T_PEER, "peer: ping 0x%08lx timed out", (unsigned long)p->id); ) | |
611 | p_pingdone(p, PING_TIMEOUT); | |
612 | } | |
613 | ||
614 | /* --- @p_pingsend@ --- * | |
615 | * | |
616 | * Arguments: @peer *p@ = destination peer | |
617 | * @ping *pg@ = structure to fill in | |
618 | * @unsigned type@ = message type | |
619 | * @unsigned long timeout@ = how long to wait before giving up | |
620 | * @void (*func)(int, void *)@ = callback function | |
621 | * @void *arg@ = argument for callback | |
622 | * | |
623 | * Returns: Zero if successful, nonzero if it failed. | |
624 | * | |
625 | * Use: Sends a ping to a peer. Call @func@ with a nonzero argument | |
626 | * if we get an answer within the timeout, or zero if no answer. | |
627 | */ | |
628 | ||
629 | int p_pingsend(peer *p, ping *pg, unsigned type, | |
630 | unsigned long timeout, | |
631 | void (*func)(int, void *), void *arg) | |
632 | { | |
633 | buf *b, bb; | |
634 | struct timeval tv; | |
635 | ||
0ba8de86 | 636 | switch (type) { |
637 | case MISC_PING: | |
638 | pg->msg = MISC_PONG; | |
639 | b = p_txstart(p, MSG_MISC | MISC_PING); | |
640 | p_pingwrite(pg, b); | |
641 | p_txend(p); | |
642 | break; | |
643 | case MISC_EPING: | |
644 | pg->msg = MISC_EPONG; | |
645 | b = p_txstart(p, MSG_MISC | MISC_EPING); | |
646 | buf_init(&bb, buf_t, sizeof(buf_t)); | |
647 | p_pingwrite(pg, &bb); | |
648 | buf_flip(&bb); | |
a50f9a0e | 649 | p_encrypt(p, MSG_MISC | MISC_EPING, &bb, b); |
0ba8de86 | 650 | if (!BOK(b)) |
651 | return (-1); | |
652 | p_txend(p); | |
653 | break; | |
654 | default: | |
655 | abort(); | |
656 | break; | |
657 | } | |
658 | ||
659 | pg->next = p->pings; | |
660 | pg->prev = 0; | |
661 | pg->p = p; | |
662 | pg->func = func; | |
663 | pg->arg = arg; | |
060ca767 | 664 | if (p->pings) p->pings->prev = pg; |
0ba8de86 | 665 | p->pings = pg; |
666 | gettimeofday(&tv, 0); | |
667 | tv.tv_sec += timeout; | |
668 | sel_addtimer(&sel, &pg->t, &tv, p_pingtimeout, pg); | |
669 | T( trace(T_PEER, "peer: send %s 0x%08lx to %s", | |
670 | p_pingtype(type), (unsigned long)pg->id, p->spec.name); ) | |
671 | return (0); | |
672 | } | |
673 | ||
37941236 | 674 | /* --- @p_greet@ --- * |
675 | * | |
676 | * Arguments: @peer *p@ = peer to send to | |
677 | * @const void *c@ = pointer to challenge | |
678 | * @size_t sz@ = size of challenge | |
679 | * | |
680 | * Returns: --- | |
681 | * | |
682 | * Use: Sends a greeting packet. | |
683 | */ | |
684 | ||
685 | void p_greet(peer *p, const void *c, size_t sz) | |
686 | { | |
687 | buf *b = p_txstart(p, MSG_MISC | MISC_GREET); | |
688 | buf_put(b, c, sz); | |
689 | p_txend(p); | |
690 | } | |
691 | ||
410c8acf | 692 | /* --- @p_tun@ --- * |
693 | * | |
694 | * Arguments: @peer *p@ = pointer to peer block | |
695 | * @buf *b@ = buffer containing incoming packet | |
696 | * | |
697 | * Returns: --- | |
698 | * | |
699 | * Use: Handles a packet which needs to be sent to a peer. | |
700 | */ | |
701 | ||
702 | void p_tun(peer *p, buf *b) | |
703 | { | |
704 | buf *bb = p_txstart(p, MSG_PACKET); | |
7b052fe6 | 705 | |
f4c9c08f | 706 | QUICKRAND; |
a50f9a0e | 707 | p_encrypt(p, MSG_PACKET, b, bb); |
5bb41301 | 708 | if (BOK(bb) && BLEN(bb)) { |
709 | p->st.n_ipout++; | |
710 | p->st.sz_ipout += BLEN(bb); | |
410c8acf | 711 | p_txend(p); |
5bb41301 | 712 | } |
410c8acf | 713 | } |
714 | ||
de014da6 | 715 | /* --- @p_keyreload@ --- * |
716 | * | |
717 | * Arguments: --- | |
718 | * | |
719 | * Returns: --- | |
720 | * | |
721 | * Use: Forces a check of the daemon's keyring files. | |
722 | */ | |
723 | ||
724 | void p_keyreload(void) | |
725 | { | |
c8e02c8a MW |
726 | if (km_reload()) |
727 | FOREACH_PEER(p, { kx_newkeys(&p->kx); }); | |
de014da6 | 728 | } |
729 | ||
410c8acf | 730 | /* --- @p_interval@ --- * |
731 | * | |
732 | * Arguments: --- | |
733 | * | |
734 | * Returns: --- | |
735 | * | |
736 | * Use: Called periodically to do tidying. | |
737 | */ | |
738 | ||
739 | void p_interval(void) | |
740 | { | |
de014da6 | 741 | p_keyreload(); |
c8e02c8a | 742 | FOREACH_PEER(p, { ksl_prune(&p->ks); }); |
410c8acf | 743 | } |
744 | ||
5bb41301 | 745 | /* --- @p_stats@ --- * |
746 | * | |
747 | * Arguments: @peer *p@ = pointer to a peer block | |
748 | * | |
749 | * Returns: A pointer to the peer's statistics. | |
750 | */ | |
751 | ||
752 | stats *p_stats(peer *p) { return (&p->st); } | |
753 | ||
410c8acf | 754 | /* --- @p_ifname@ --- * |
755 | * | |
756 | * Arguments: @peer *p@ = pointer to a peer block | |
757 | * | |
758 | * Returns: A pointer to the peer's interface name. | |
759 | */ | |
760 | ||
64cf2223 MW |
761 | const char *p_ifname(peer *p) { return (p->ifname); } |
762 | ||
763 | /* --- @p_setifname@ --- * | |
764 | * | |
765 | * Arguments: @peer *p@ = pointer to a peer block | |
766 | * @const char *name@ = pointer to the new name | |
767 | * | |
768 | * Returns: --- | |
769 | * | |
770 | * Use: Changes the name held for a peer's interface. | |
771 | */ | |
772 | ||
773 | void p_setifname(peer *p, const char *name) | |
72917fe7 MW |
774 | { |
775 | xfree(p->ifname); | |
776 | p->ifname = xstrdup(name); | |
777 | if (p->spec.tops->setifname) | |
778 | p->spec.tops->setifname(p->t, name); | |
779 | } | |
410c8acf | 780 | |
781 | /* --- @p_addr@ --- * | |
782 | * | |
783 | * Arguments: @peer *p@ = pointer to a peer block | |
784 | * | |
785 | * Returns: A pointer to the peer's address. | |
786 | */ | |
787 | ||
0ba8de86 | 788 | const addr *p_addr(peer *p) { return (&p->spec.sa); } |
410c8acf | 789 | |
790 | /* --- @p_init@ --- * | |
791 | * | |
767b36e2 | 792 | * Arguments: @struct in_addr addr@ = address to bind to |
793 | * @unsigned port@ = port number to listen to | |
410c8acf | 794 | * |
795 | * Returns: --- | |
796 | * | |
797 | * Use: Initializes the peer system; creates the socket. | |
798 | */ | |
799 | ||
767b36e2 | 800 | void p_init(struct in_addr addr, unsigned port) |
410c8acf | 801 | { |
802 | int fd; | |
803 | struct sockaddr_in sin; | |
df9dfccf | 804 | int len = PKBUFSZ; |
0a9920e2 | 805 | |
806 | /* --- Note on socket buffer sizes --- * | |
807 | * | |
808 | * For some bizarre reason, Linux 2.2 (at least) doubles the socket buffer | |
809 | * sizes I pass to @setsockopt@. I'm not putting special-case code here | |
810 | * for Linux: BSD (at least TCPv2) does what I tell it rather than second- | |
811 | * guessing me. | |
812 | */ | |
410c8acf | 813 | |
814 | if ((fd = socket(PF_INET, SOCK_DGRAM, 0)) < 0) | |
815 | die(EXIT_FAILURE, "socket creation failed: %s", strerror(errno)); | |
816 | BURN(sin); | |
817 | sin.sin_family = AF_INET; | |
767b36e2 | 818 | sin.sin_addr = addr; |
410c8acf | 819 | sin.sin_port = htons(port); |
820 | if (bind(fd, (struct sockaddr *)&sin, sizeof(sin))) | |
821 | die(EXIT_FAILURE, "bind failed: %s", strerror(errno)); | |
0a9920e2 | 822 | if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, sizeof(len)) || |
823 | setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &len, sizeof(len))) { | |
824 | die(EXIT_FAILURE, "failed to set socket buffer sizes: %s", | |
825 | strerror(errno)); | |
826 | } | |
650a6624 | 827 | fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC); |
410c8acf | 828 | sel_initfile(&sel, &sock, fd, SEL_READ, p_read, 0); |
829 | sel_addfile(&sock); | |
830 | T( trace(T_PEER, "peer: created socket"); ) | |
c8e02c8a MW |
831 | |
832 | sym_create(&byname); | |
833 | am_create(&byaddr); | |
410c8acf | 834 | } |
835 | ||
836 | /* --- @p_port@ --- * | |
837 | * | |
838 | * Arguments: --- | |
839 | * | |
840 | * Returns: Port number used for socket. | |
841 | */ | |
842 | ||
843 | unsigned p_port(void) | |
844 | { | |
845 | addr a; | |
cb160b86 | 846 | socklen_t sz = sizeof(addr); |
410c8acf | 847 | |
848 | if (getsockname(sock.fd, &a.sa, &sz)) | |
849 | die(EXIT_FAILURE, "couldn't read port number: %s", strerror(errno)); | |
850 | assert(a.sa.sa_family == AF_INET); | |
851 | return (ntohs(a.sin.sin_port)); | |
852 | } | |
853 | ||
0ba8de86 | 854 | /* --- @p_keepalive@ --- * |
855 | * | |
856 | * Arguments: @struct timeval *now@ = the current time | |
857 | * @void *pv@ = peer to wake up | |
858 | * | |
859 | * Returns: --- | |
860 | * | |
861 | * Use: Sends a keepalive ping message to its peer. | |
862 | */ | |
863 | ||
864 | static void p_keepalive(struct timeval *now, void *pv) | |
865 | { | |
866 | peer *p = pv; | |
fe2a5dcf | 867 | |
0ba8de86 | 868 | p_txstart(p, MSG_MISC | MISC_NOP); p_dotxend(p); |
869 | T( trace(T_PEER, "peer: sent keepalive to %s", p->spec.name); ) | |
870 | p_setkatimer(p); | |
871 | } | |
872 | ||
873 | /* --- @p_setkatimer@ --- * | |
874 | * | |
875 | * Arguments: @peer *p@ = peer to set | |
876 | * | |
877 | * Returns: --- | |
878 | * | |
879 | * Use: Resets the keepalive timer thing. | |
880 | */ | |
881 | ||
882 | static void p_setkatimer(peer *p) | |
883 | { | |
884 | struct timeval tv; | |
885 | ||
886 | if (!p->spec.t_ka) | |
887 | return; | |
888 | gettimeofday(&tv, 0); | |
889 | tv.tv_sec += p->spec.t_ka; | |
890 | sel_addtimer(&sel, &p->tka, &tv, p_keepalive, p); | |
891 | } | |
892 | ||
410c8acf | 893 | /* --- @p_create@ --- * |
894 | * | |
0ba8de86 | 895 | * Arguments: @peerspec *spec@ = information about this peer |
410c8acf | 896 | * |
897 | * Returns: Pointer to the peer block, or null if it failed. | |
898 | * | |
899 | * Use: Creates a new named peer block. No peer is actually attached | |
900 | * by this point. | |
901 | */ | |
902 | ||
0ba8de86 | 903 | peer *p_create(peerspec *spec) |
410c8acf | 904 | { |
905 | peer *p = CREATE(peer); | |
eb5f3fea MW |
906 | const tunnel_ops *tops = spec->tops; |
907 | int fd; | |
c8e02c8a MW |
908 | unsigned f; |
909 | ||
910 | p->byname = sym_find(&byname, spec->name, -1, sizeof(peer_byname), &f); | |
911 | if (f) goto tidy_0; | |
912 | p->byaddr = am_find(&byaddr, &spec->sa, sizeof(peer_byaddr), &f); | |
913 | if (f) goto tidy_1; | |
914 | p->byname->p = p->byaddr->p = p; | |
42da2a58 | 915 | |
0ba8de86 | 916 | T( trace(T_PEER, "peer: creating new peer `%s'", spec->name); ) |
917 | p->spec = *spec; | |
c8e02c8a | 918 | p->spec.name = (/*unconst*/ char *)SYM_NAME(p->byname); |
fe2a5dcf MW |
919 | if (spec->tag) p->spec.tag = xstrdup(spec->tag); |
920 | if (spec->privtag) p->spec.privtag = xstrdup(spec->privtag); | |
8362ac1c | 921 | if (spec->knock) p->spec.knock = xstrdup(spec->knock); |
410c8acf | 922 | p->ks = 0; |
629842d8 | 923 | p->pings = 0; |
64cf2223 | 924 | p->ifname = 0; |
5bb41301 | 925 | memset(&p->st, 0, sizeof(stats)); |
926 | p->st.t_start = time(0); | |
388e0319 | 927 | if (!(tops->flags & TUNF_PRIVOPEN)) |
eb5f3fea | 928 | fd = -1; |
388e0319 | 929 | else if ((fd = ps_tunfd(tops, &p->ifname)) < 0) |
c8e02c8a | 930 | goto tidy_2; |
eb5f3fea MW |
931 | if ((p->t = tops->create(p, fd, &p->ifname)) == 0) |
932 | goto tidy_3; | |
933 | T( trace(T_TUNNEL, "peer: attached interface %s to peer `%s'", | |
934 | p->ifname, p_name(p)); ) | |
0ba8de86 | 935 | p_setkatimer(p); |
0510f262 | 936 | if (kx_setup(&p->kx, p, &p->ks, p->spec.f & PSF_KXMASK)) |
eb5f3fea | 937 | goto tidy_4; |
f43df819 | 938 | a_notify("ADD", |
6047fbac MW |
939 | "?PEER", p, |
940 | "%s", p->ifname, | |
941 | "?ADDR", &p->spec.sa, | |
942 | A_END); | |
8743c776 | 943 | if (!(p->spec.f & KXF_CORK)) { |
010e6f63 | 944 | a_notify("KXSTART", "?PEER", p, A_END); |
f43df819 | 945 | /* Couldn't tell anyone before */ |
010e6f63 | 946 | } |
6411163d | 947 | if (p->spec.f & PSF_MOBILE) nmobile++; |
410c8acf | 948 | return (p); |
949 | ||
eb5f3fea | 950 | tidy_4: |
fe2a5dcf | 951 | if (spec->t_ka) sel_rmtimer(&p->tka); |
72917fe7 | 952 | xfree(p->ifname); |
0ba8de86 | 953 | p->t->ops->destroy(p->t); |
eb5f3fea MW |
954 | tidy_3: |
955 | if (fd >= 0) close(fd); | |
c8e02c8a MW |
956 | tidy_2: |
957 | am_remove(&byaddr, p->byaddr); | |
48b84569 | 958 | if (p->spec.tag) xfree(p->spec.tag); |
fe2a5dcf | 959 | if (p->spec.privtag) xfree(p->spec.privtag); |
c8e02c8a MW |
960 | tidy_1: |
961 | sym_remove(&byname, p->byname); | |
410c8acf | 962 | tidy_0: |
410c8acf | 963 | DESTROY(p); |
964 | return (0); | |
965 | } | |
966 | ||
967 | /* --- @p_name@ --- * | |
968 | * | |
969 | * Arguments: @peer *p@ = pointer to a peer block | |
970 | * | |
971 | * Returns: A pointer to the peer's name. | |
972 | */ | |
973 | ||
6411163d MW |
974 | const char *p_name(peer *p) |
975 | { if (p) return (p->spec.name); else return ("-"); } | |
410c8acf | 976 | |
48b84569 MW |
977 | /* --- @p_tag@ --- * |
978 | * | |
979 | * Arguments: @peer *p@ = pointer to a peer block | |
980 | * | |
981 | * Returns: A pointer to the peer's public key tag. | |
982 | */ | |
983 | ||
984 | const char *p_tag(peer *p) | |
985 | { return (p->spec.tag ? p->spec.tag : p->spec.name); } | |
986 | ||
fe2a5dcf MW |
987 | /* --- @p_privtag@ --- * |
988 | * | |
989 | * Arguments: @peer *p@ = pointer to a peer block | |
990 | * | |
991 | * Returns: A pointer to the peer's private key tag. | |
992 | */ | |
993 | ||
994 | const char *p_privtag(peer *p) | |
995 | { return (p->spec.privtag ? p->spec.privtag : tag_priv); } | |
996 | ||
060ca767 | 997 | /* --- @p_spec@ --- * |
998 | * | |
999 | * Arguments: @peer *p@ = pointer to a peer block | |
1000 | * | |
1001 | * Returns: Pointer to the peer's specification | |
1002 | */ | |
1003 | ||
1004 | const peerspec *p_spec(peer *p) { return (&p->spec); } | |
1005 | ||
c8e02c8a MW |
1006 | /* --- @p_findbyaddr@ --- * |
1007 | * | |
1008 | * Arguments: @const addr *a@ = address to look up | |
1009 | * | |
1010 | * Returns: Pointer to the peer block, or null if not found. | |
1011 | * | |
1012 | * Use: Finds a peer by address. | |
1013 | */ | |
1014 | ||
1015 | peer *p_findbyaddr(const addr *a) | |
1016 | { | |
1017 | peer_byaddr *pa; | |
1018 | ||
6411163d MW |
1019 | if ((pa = am_find(&byaddr, a, 0, 0)) != 0) { |
1020 | assert(pa->p); | |
c8e02c8a | 1021 | return (pa->p); |
6411163d | 1022 | } |
c8e02c8a MW |
1023 | return (0); |
1024 | } | |
1025 | ||
410c8acf | 1026 | /* --- @p_find@ --- * |
1027 | * | |
1028 | * Arguments: @const char *name@ = name to look up | |
1029 | * | |
1030 | * Returns: Pointer to the peer block, or null if not found. | |
1031 | * | |
1032 | * Use: Finds a peer by name. | |
1033 | */ | |
1034 | ||
1035 | peer *p_find(const char *name) | |
1036 | { | |
c8e02c8a MW |
1037 | peer_byname *pn; |
1038 | ||
1039 | if ((pn = sym_find(&byname, name, -1, 0, 0)) != 0) | |
1040 | return (pn->p); | |
e04c2d50 | 1041 | return (0); |
410c8acf | 1042 | } |
1043 | ||
1044 | /* --- @p_destroy@ --- * | |
1045 | * | |
1046 | * Arguments: @peer *p@ = pointer to a peer | |
1047 | * | |
1048 | * Returns: --- | |
1049 | * | |
1050 | * Use: Destroys a peer. | |
1051 | */ | |
1052 | ||
1053 | void p_destroy(peer *p) | |
1054 | { | |
0ba8de86 | 1055 | ping *pg, *ppg; |
1056 | ||
1057 | T( trace(T_PEER, "peer: destroying peer `%s'", p->spec.name); ) | |
f43df819 | 1058 | a_notify("KILL", "%s", p->spec.name, A_END); |
5bb41301 | 1059 | ksl_free(&p->ks); |
410c8acf | 1060 | kx_free(&p->kx); |
fe2a5dcf MW |
1061 | if (p->spec.f & PSF_MOBILE) nmobile--; |
1062 | if (p->ifname) xfree(p->ifname); | |
1063 | if (p->spec.tag) xfree(p->spec.tag); | |
1064 | if (p->spec.privtag) xfree(p->spec.privtag); | |
8362ac1c | 1065 | if (p->spec.knock) xfree(p->spec.knock); |
42da2a58 | 1066 | p->t->ops->destroy(p->t); |
fe2a5dcf | 1067 | if (p->spec.t_ka) sel_rmtimer(&p->tka); |
0ba8de86 | 1068 | for (pg = p->pings; pg; pg = ppg) { |
1069 | ppg = pg->next; | |
1070 | p_pingdone(pg, PING_PEERDIED); | |
1071 | } | |
c8e02c8a MW |
1072 | sym_remove(&byname, p->byname); |
1073 | am_remove(&byaddr, p->byaddr); | |
410c8acf | 1074 | DESTROY(p); |
1075 | } | |
1076 | ||
c8e02c8a MW |
1077 | /* --- @p_mkiter@ --- * |
1078 | * | |
1079 | * Arguments: @peer_iter *i@ = pointer to an iterator | |
1080 | * | |
1081 | * Returns: --- | |
1082 | * | |
1083 | * Use: Initializes the iterator. | |
1084 | */ | |
1085 | ||
1086 | void p_mkiter(peer_iter *i) { sym_mkiter(&i->i, &byname); } | |
1087 | ||
1088 | /* --- @p_next@ --- * | |
1089 | * | |
1090 | * Arguments: @peer_iter *i@ = pointer to an iterator | |
410c8acf | 1091 | * |
c8e02c8a | 1092 | * Returns: Next peer, or null if at the end. |
410c8acf | 1093 | * |
c8e02c8a | 1094 | * Use: Returns the next peer. |
410c8acf | 1095 | */ |
1096 | ||
c8e02c8a MW |
1097 | peer *p_next(peer_iter *i) |
1098 | { | |
1099 | peer_byname *pn; | |
1100 | ||
1101 | if ((pn = sym_next(&i->i)) == 0) | |
1102 | return (0); | |
1103 | return (pn->p); | |
1104 | } | |
410c8acf | 1105 | |
1106 | /*----- That's all, folks -------------------------------------------------*/ |