File: | src/sbin/resolvd/resolvd.c |
Warning: | line 187, column 2 Value stored to 'argv' is never read |
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1 | /* $OpenBSD: resolvd.c,v 1.25 2021/11/16 16:24:22 kn Exp $ */ |
2 | /* |
3 | * Copyright (c) 2021 Florian Obser <florian@openbsd.org> |
4 | * Copyright (c) 2021 Theo de Raadt <deraadt@openbsd.org> |
5 | * |
6 | * Permission to use, copy, modify, and distribute this software for any |
7 | * purpose with or without fee is hereby granted, provided that the above |
8 | * copyright notice and this permission notice appear in all copies. |
9 | * |
10 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
11 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
12 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
13 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
14 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
15 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
16 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
17 | */ |
18 | |
19 | #include <sys/types.h> |
20 | #include <sys/event.h> |
21 | #include <sys/socket.h> |
22 | #include <sys/stat.h> |
23 | #include <sys/syslog.h> |
24 | #include <sys/time.h> |
25 | #include <sys/un.h> |
26 | #include <netdb.h> |
27 | |
28 | #include <arpa/inet.h> |
29 | #include <netinet/in.h> |
30 | #include <net/if.h> |
31 | #include <net/route.h> |
32 | |
33 | #include <err.h> |
34 | #include <errno(*__errno()).h> |
35 | #include <fcntl.h> |
36 | #include <event.h> |
37 | #include <signal.h> |
38 | #include <stddef.h> |
39 | #include <stdio.h> |
40 | #include <stdlib.h> |
41 | #include <string.h> |
42 | #include <unistd.h> |
43 | |
44 | #define ROUTE_SOCKET_BUF_SIZE16384 16384 |
45 | #define ASR_MAXNS10 10 |
46 | #define _PATH_LOCKFILE"/dev/resolvd.lock" "/dev/resolvd.lock" |
47 | #define _PATH_UNWIND_SOCKET"/dev/unwind.sock" "/dev/unwind.sock" |
48 | #define _PATH_RESCONF"/etc/resolv.conf" "/etc/resolv.conf" |
49 | #define _PATH_RESCONF_NEW"/etc/resolv.conf.new" "/etc/resolv.conf.new" |
50 | |
51 | #ifndef nitems |
52 | #define nitems(_a)(sizeof((_a)) / sizeof((_a)[0])) (sizeof((_a)) / sizeof((_a)[0])) |
53 | #endif |
54 | |
55 | __dead__attribute__((__noreturn__)) void usage(void); |
56 | |
57 | struct rdns_proposal { |
58 | uint32_t if_index; |
59 | int af; |
60 | int prio; |
61 | char ip[INET6_ADDRSTRLEN46]; |
62 | }; |
63 | |
64 | void route_receive(int); |
65 | void handle_route_message(struct rt_msghdr *, struct sockaddr **); |
66 | void get_rtaddrs(int, struct sockaddr *, struct sockaddr **); |
67 | void solicit_dns_proposals(int); |
68 | void regen_resolvconf(char *reason); |
69 | int cmp(const void *, const void *); |
70 | int findslot(struct rdns_proposal *); |
71 | void zeroslot(struct rdns_proposal *); |
72 | |
73 | struct rdns_proposal learned[ASR_MAXNS10]; |
74 | int resolvfd = -1; |
75 | int newkevent = 1; |
76 | |
77 | #ifndef SMALL |
78 | int open_unwind_ctl(void); |
79 | int check_unwind = 1, unwind_running = 0; |
80 | |
81 | struct loggers { |
82 | __dead__attribute__((__noreturn__)) void (*err)(int, const char *, ...) |
83 | __attribute__((__format__ (printf, 2, 3))); |
84 | __dead__attribute__((__noreturn__)) void (*errx)(int, const char *, ...) |
85 | __attribute__((__format__ (printf, 2, 3))); |
86 | void (*warn)(const char *, ...) |
87 | __attribute__((__format__ (printf, 1, 2))); |
88 | void (*warnx)(const char *, ...) |
89 | __attribute__((__format__ (printf, 1, 2))); |
90 | void (*info)(const char *, ...) |
91 | __attribute__((__format__ (printf, 1, 2))); |
92 | void (*debug)(const char *, ...) |
93 | __attribute__((__format__ (printf, 1, 2))); |
94 | }; |
95 | |
96 | void warnx_verbose(const char *, ...) |
97 | __attribute__((__format__ (printf, 1, 2))); |
98 | |
99 | const struct loggers conslogger = { |
100 | err, |
101 | errx, |
102 | warn, |
103 | warnx, |
104 | warnx_verbose, /* info */ |
105 | warnx_verbose /* debug */ |
106 | }; |
107 | |
108 | __dead__attribute__((__noreturn__)) void syslog_err(int, const char *, ...) |
109 | __attribute__((__format__ (printf, 2, 3))); |
110 | __dead__attribute__((__noreturn__)) void syslog_errx(int, const char *, ...) |
111 | __attribute__((__format__ (printf, 2, 3))); |
112 | void syslog_warn(const char *, ...) |
113 | __attribute__((__format__ (printf, 1, 2))); |
114 | void syslog_warnx(const char *, ...) |
115 | __attribute__((__format__ (printf, 1, 2))); |
116 | void syslog_info(const char *, ...) |
117 | __attribute__((__format__ (printf, 1, 2))); |
118 | void syslog_debug(const char *, ...) |
119 | __attribute__((__format__ (printf, 1, 2))); |
120 | void syslog_vstrerror(int, int, const char *, va_list) |
121 | __attribute__((__format__ (printf, 3, 0))); |
122 | |
123 | int verbose = 0; |
124 | |
125 | const struct loggers syslogger = { |
126 | syslog_err, |
127 | syslog_errx, |
128 | syslog_warn, |
129 | syslog_warnx, |
130 | syslog_info, |
131 | syslog_debug |
132 | }; |
133 | |
134 | const struct loggers *logger = &conslogger; |
135 | |
136 | #define lerr(_e, _f...)logger->err((_e), _f...) logger->err((_e), _f) |
137 | #define lerrx(_e, _f...)logger->errx((_e), _f...) logger->errx((_e), _f) |
138 | #define lwarn(_f...)logger->warn(_f...) logger->warn(_f) |
139 | #define lwarnx(_f...)logger->warnx(_f...) logger->warnx(_f) |
140 | #define linfo(_f...)logger->info(_f...) logger->info(_f) |
141 | #define ldebug(_f...)logger->debug(_f...) logger->debug(_f) |
142 | #else |
143 | #define lerr(x...)logger->err((x...), ) do {} while(0) |
144 | #define lerrx(x...)logger->errx((x...), ) do {} while(0) |
145 | #define lwarn(x...)logger->warn(x...) do {} while(0) |
146 | #define lwarnx(x...)logger->warnx(x...) do {} while(0) |
147 | #define linfo(x...)logger->info(x...) do {} while(0) |
148 | #define ldebug(x...)logger->debug(x...) do {} while(0) |
149 | #endif /* SMALL */ |
150 | |
151 | enum { |
152 | KQ_ROUTE, |
153 | KQ_RESOLVE_CONF, |
154 | #ifndef SMALL |
155 | KQ_UNWIND, |
156 | #endif |
157 | KQ_TOTAL |
158 | }; |
159 | |
160 | int |
161 | main(int argc, char *argv[]) |
162 | { |
163 | struct timespec one = {1, 0}; |
164 | int kq, ch, debug = 0, routesock; |
165 | int rtfilter, nready, lockfd; |
166 | struct kevent kev[KQ_TOTAL]; |
167 | #ifndef SMALL |
168 | int unwindsock = -1; |
169 | #endif |
170 | |
171 | while ((ch = getopt(argc, argv, "dv")) != -1) { |
172 | switch (ch) { |
173 | case 'd': |
174 | debug = 1; |
175 | break; |
176 | case 'v': |
177 | #ifndef SMALL |
178 | verbose++; |
179 | #endif |
180 | break; |
181 | default: |
182 | usage(); |
183 | } |
184 | } |
185 | |
186 | argc -= optind; |
187 | argv += optind; |
Value stored to 'argv' is never read | |
188 | if (argc > 0) |
189 | usage(); |
190 | |
191 | /* Check for root privileges. */ |
192 | if (geteuid()) |
193 | errx(1, "need root privileges"); |
194 | |
195 | lockfd = open(_PATH_LOCKFILE"/dev/resolvd.lock", O_CREAT0x0200|O_RDWR0x0002|O_EXLOCK0x0020|O_NONBLOCK0x0004, 0600); |
196 | if (lockfd == -1) |
197 | errx(1, "already running"); |
198 | |
199 | if (!debug) |
200 | daemon(0, 0); |
201 | |
202 | #ifndef SMALL |
203 | if (!debug) { |
204 | openlog("resolvd", LOG_PID0x01|LOG_NDELAY0x08, LOG_DAEMON(3<<3)); |
205 | logger = &syslogger; |
206 | } |
207 | #endif |
208 | |
209 | signal(SIGHUP1, SIG_IGN(void (*)(int))1); |
210 | |
211 | if ((routesock = socket(AF_ROUTE17, SOCK_RAW3, 0)) == -1) |
212 | lerr(1, "route socket")logger->err((1), "route socket"); |
213 | |
214 | rtfilter = ROUTE_FILTER(RTM_PROPOSAL)(1 << (0x13)) | ROUTE_FILTER(RTM_IFANNOUNCE)(1 << (0xf)); |
215 | if (setsockopt(routesock, AF_ROUTE17, ROUTE_MSGFILTER1, &rtfilter, |
216 | sizeof(rtfilter)) == -1) |
217 | lerr(1, "setsockopt(ROUTE_MSGFILTER)")logger->err((1), "setsockopt(ROUTE_MSGFILTER)"); |
218 | |
219 | solicit_dns_proposals(routesock); |
220 | |
221 | if (unveil(_PATH_RESCONF"/etc/resolv.conf", "rwc") == -1) |
222 | lerr(1, "unveil " _PATH_RESCONF)logger->err((1), "unveil " "/etc/resolv.conf"); |
223 | if (unveil(_PATH_RESCONF_NEW"/etc/resolv.conf.new", "rwc") == -1) |
224 | lerr(1, "unveil " _PATH_RESCONF_NEW)logger->err((1), "unveil " "/etc/resolv.conf.new"); |
225 | #ifndef SMALL |
226 | if (unveil(_PATH_UNWIND_SOCKET"/dev/unwind.sock", "r") == -1) |
227 | lerr(1, "unveil " _PATH_UNWIND_SOCKET)logger->err((1), "unveil " "/dev/unwind.sock"); |
228 | #endif |
229 | |
230 | if (pledge("stdio unix rpath wpath cpath", NULL((void*)0)) == -1) |
231 | lerr(1, "pledge")logger->err((1), "pledge"); |
232 | |
233 | if ((kq = kqueue()) == -1) |
234 | lerr(1, "kqueue")logger->err((1), "kqueue"); |
235 | |
236 | for(;;) { |
237 | int i; |
238 | |
239 | #ifndef SMALL |
240 | if (!unwind_running && check_unwind) { |
241 | check_unwind = 0; |
242 | unwindsock = open_unwind_ctl(); |
243 | unwind_running = unwindsock != -1; |
244 | if (unwind_running) |
245 | regen_resolvconf("new unwind"); |
246 | } |
247 | #endif |
248 | |
249 | if (newkevent) { |
250 | int kevi = 0; |
251 | |
252 | if (routesock != -1) |
253 | EV_SET(&kev[kevi++], routesock, EVFILT_READ,do { struct kevent *__kevp = (&kev[kevi++]); (__kevp)-> ident = (routesock); (__kevp)->filter = ((-1)); (__kevp)-> flags = (0x0001); (__kevp)->fflags = (0); (__kevp)->data = (0); (__kevp)->udata = ((void *)KQ_ROUTE); } while(0) |
254 | EV_ADD, 0, 0,do { struct kevent *__kevp = (&kev[kevi++]); (__kevp)-> ident = (routesock); (__kevp)->filter = ((-1)); (__kevp)-> flags = (0x0001); (__kevp)->fflags = (0); (__kevp)->data = (0); (__kevp)->udata = ((void *)KQ_ROUTE); } while(0) |
255 | (void *)KQ_ROUTE)do { struct kevent *__kevp = (&kev[kevi++]); (__kevp)-> ident = (routesock); (__kevp)->filter = ((-1)); (__kevp)-> flags = (0x0001); (__kevp)->fflags = (0); (__kevp)->data = (0); (__kevp)->udata = ((void *)KQ_ROUTE); } while(0); |
256 | if (resolvfd != -1) |
257 | EV_SET(&kev[kevi++], resolvfd, EVFILT_VNODE,do { struct kevent *__kevp = (&kev[kevi++]); (__kevp)-> ident = (resolvfd); (__kevp)->filter = ((-4)); (__kevp)-> flags = (0x0001 | 0x0020); (__kevp)->fflags = (0x0001 | 0x0020 | 0x0080 | 0x0002); (__kevp)->data = (0); (__kevp)->udata = ((void *)KQ_RESOLVE_CONF); } while(0) |
258 | EV_ADD | EV_CLEAR,do { struct kevent *__kevp = (&kev[kevi++]); (__kevp)-> ident = (resolvfd); (__kevp)->filter = ((-4)); (__kevp)-> flags = (0x0001 | 0x0020); (__kevp)->fflags = (0x0001 | 0x0020 | 0x0080 | 0x0002); (__kevp)->data = (0); (__kevp)->udata = ((void *)KQ_RESOLVE_CONF); } while(0) |
259 | NOTE_DELETE | NOTE_RENAME | NOTE_TRUNCATE | NOTE_WRITE, 0,do { struct kevent *__kevp = (&kev[kevi++]); (__kevp)-> ident = (resolvfd); (__kevp)->filter = ((-4)); (__kevp)-> flags = (0x0001 | 0x0020); (__kevp)->fflags = (0x0001 | 0x0020 | 0x0080 | 0x0002); (__kevp)->data = (0); (__kevp)->udata = ((void *)KQ_RESOLVE_CONF); } while(0) |
260 | (void *)KQ_RESOLVE_CONF)do { struct kevent *__kevp = (&kev[kevi++]); (__kevp)-> ident = (resolvfd); (__kevp)->filter = ((-4)); (__kevp)-> flags = (0x0001 | 0x0020); (__kevp)->fflags = (0x0001 | 0x0020 | 0x0080 | 0x0002); (__kevp)->data = (0); (__kevp)->udata = ((void *)KQ_RESOLVE_CONF); } while(0); |
261 | |
262 | #ifndef SMALL |
263 | if (unwind_running) { |
264 | EV_SET(&kev[kevi++], unwindsock, EVFILT_READ,do { struct kevent *__kevp = (&kev[kevi++]); (__kevp)-> ident = (unwindsock); (__kevp)->filter = ((-1)); (__kevp)-> flags = (0x0001); (__kevp)->fflags = (0); (__kevp)->data = (0); (__kevp)->udata = ((void *)KQ_UNWIND); } while(0) |
265 | EV_ADD, 0, 0,do { struct kevent *__kevp = (&kev[kevi++]); (__kevp)-> ident = (unwindsock); (__kevp)->filter = ((-1)); (__kevp)-> flags = (0x0001); (__kevp)->fflags = (0); (__kevp)->data = (0); (__kevp)->udata = ((void *)KQ_UNWIND); } while(0) |
266 | (void *)KQ_UNWIND)do { struct kevent *__kevp = (&kev[kevi++]); (__kevp)-> ident = (unwindsock); (__kevp)->filter = ((-1)); (__kevp)-> flags = (0x0001); (__kevp)->fflags = (0); (__kevp)->data = (0); (__kevp)->udata = ((void *)KQ_UNWIND); } while(0); |
267 | } |
268 | #endif /* SMALL */ |
269 | |
270 | if (kevent(kq, kev, kevi, NULL((void*)0), 0, NULL((void*)0)) == -1) |
271 | lerr(1, "kevent")logger->err((1), "kevent"); |
272 | newkevent = 0; |
273 | } |
274 | |
275 | nready = kevent(kq, NULL((void*)0), 0, kev, KQ_TOTAL, NULL((void*)0)); |
276 | if (nready == -1) { |
277 | if (errno(*__errno()) == EINTR4) |
278 | continue; |
279 | lerr(1, "kevent")logger->err((1), "kevent"); |
280 | } |
281 | |
282 | if (nready == 0) |
283 | continue; |
284 | |
285 | for (i = 0; i < nready; i++) { |
286 | unsigned short fflags = kev[i].fflags; |
287 | |
288 | switch ((int)(long)kev[i].udata) { |
289 | case KQ_ROUTE: |
290 | route_receive(routesock); |
291 | break; |
292 | |
293 | case KQ_RESOLVE_CONF: |
294 | if (fflags & (NOTE_DELETE0x0001 | NOTE_RENAME0x0020)) { |
295 | close(resolvfd); |
296 | resolvfd = -1; |
297 | regen_resolvconf("file delete/rename"); |
298 | } |
299 | if (fflags & (NOTE_TRUNCATE0x0080 | NOTE_WRITE0x0002)) { |
300 | /* some editors truncate and write */ |
301 | if (fflags & NOTE_TRUNCATE0x0080) |
302 | nanosleep(&one, NULL((void*)0)); |
303 | regen_resolvconf("file trunc/write"); |
304 | } |
305 | break; |
306 | |
307 | #ifndef SMALL |
308 | case KQ_UNWIND: { |
309 | uint8_t buf[1024]; |
310 | ssize_t n; |
311 | |
312 | n = read(unwindsock, buf, sizeof(buf)); |
313 | if (n == -1) { |
314 | if (errno(*__errno()) == EAGAIN35 || errno(*__errno()) == EINTR4) |
315 | continue; |
316 | } |
317 | if (n == 0 || n == -1) { |
318 | if (n == -1) |
319 | check_unwind = 1; |
320 | newkevent = 1; |
321 | close(unwindsock); |
322 | unwindsock = -1; |
323 | unwind_running = 0; |
324 | regen_resolvconf("unwind closed"); |
325 | } else |
326 | lwarnx("read %ld from unwind ctl", n)logger->warnx("read %ld from unwind ctl", n); |
327 | break; |
328 | } |
329 | #endif |
330 | |
331 | default: |
332 | lwarnx("unknown kqueue event on %lu",logger->warnx("unknown kqueue event on %lu", kev[i].ident) |
333 | kev[i].ident)logger->warnx("unknown kqueue event on %lu", kev[i].ident); |
334 | } |
335 | } |
336 | } |
337 | return 0; |
338 | } |
339 | |
340 | __dead__attribute__((__noreturn__)) void |
341 | usage(void) |
342 | { |
343 | fprintf(stderr(&__sF[2]), "usage: resolvd [-dv]\n"); |
344 | exit(1); |
345 | } |
346 | |
347 | void |
348 | route_receive(int fd) |
349 | { |
350 | uint8_t rsock_buf[ROUTE_SOCKET_BUF_SIZE16384]; |
351 | struct sockaddr *sa, *rti_info[RTAX_MAX15]; |
352 | struct rt_msghdr *rtm; |
353 | ssize_t n; |
354 | |
355 | rtm = (struct rt_msghdr *) rsock_buf; |
356 | if ((n = read(fd, rsock_buf, sizeof(rsock_buf))) == -1) { |
357 | if (errno(*__errno()) == EAGAIN35 || errno(*__errno()) == EINTR4) |
358 | return; |
359 | lwarn("%s: read error", __func__)logger->warn("%s: read error", __func__); |
360 | return; |
361 | } |
362 | |
363 | if (n == 0) |
364 | lerr(1, "routing socket closed")logger->err((1), "routing socket closed"); |
365 | |
366 | if (n < (ssize_t)sizeof(rtm->rtm_msglen) || n < rtm->rtm_msglen) { |
367 | lwarnx("partial rtm of %zd in buffer", n)logger->warnx("partial rtm of %zd in buffer", n); |
368 | return; |
369 | } |
370 | |
371 | if (rtm->rtm_version != RTM_VERSION5) |
372 | return; |
373 | |
374 | if (rtm->rtm_pid == getpid()) |
375 | return; |
376 | |
377 | sa = (struct sockaddr *)(rsock_buf + rtm->rtm_hdrlen); |
378 | get_rtaddrs(rtm->rtm_addrs, sa, rti_info); |
379 | handle_route_message(rtm, rti_info); |
380 | } |
381 | |
382 | void |
383 | zeroslot(struct rdns_proposal *tab) |
384 | { |
385 | tab->prio = 0; |
386 | tab->af = 0; |
387 | tab->if_index = 0; |
388 | tab->ip[0] = '\0'; |
389 | } |
390 | |
391 | int |
392 | findslot(struct rdns_proposal *tab) |
393 | { |
394 | int i; |
395 | |
396 | for (i = 0; i < ASR_MAXNS10; i++) |
397 | if (tab[i].prio == 0) |
398 | return i; |
399 | |
400 | /* New proposals might be important, so replace the last slot */ |
401 | i = ASR_MAXNS10 - 1; |
402 | zeroslot(&tab[i]); |
403 | return i; |
404 | } |
405 | |
406 | void |
407 | handle_route_message(struct rt_msghdr *rtm, struct sockaddr **rti_info) |
408 | { |
409 | struct rdns_proposal learning[nitems(learned)(sizeof((learned)) / sizeof((learned)[0]))]; |
410 | struct sockaddr_rtdns *rtdns; |
411 | struct if_announcemsghdr *ifan; |
412 | size_t addrsz; |
413 | int rdns_count, af, i; |
414 | char *src; |
415 | |
416 | memcpy(learning, learned, sizeof learned); |
417 | |
418 | switch (rtm->rtm_type) { |
419 | case RTM_IFANNOUNCE0xf: |
420 | ifan = (struct if_announcemsghdr *)rtm; |
421 | if (ifan->ifan_what == IFAN_ARRIVAL0) |
422 | return; |
423 | /* Delete proposals learned from departing interfaces */ |
424 | for (i = 0; i < ASR_MAXNS10; i++) |
425 | if (learning[i].if_index == ifan->ifan_index) |
426 | zeroslot(&learning[i]); |
427 | break; |
428 | case RTM_PROPOSAL0x13: |
429 | if (rtm->rtm_priority == RTP_PROPOSAL_SOLICIT62) { |
430 | #ifndef SMALL |
431 | check_unwind = 1; |
432 | #endif /* SMALL */ |
433 | return; |
434 | } |
435 | |
436 | if (!(rtm->rtm_addrs & RTA_DNS0x1000)) |
437 | return; |
438 | |
439 | rtdns = (struct sockaddr_rtdns*)rti_info[RTAX_DNS12]; |
440 | src = rtdns->sr_dns; |
441 | af = rtdns->sr_family; |
442 | |
443 | switch (af) { |
444 | case AF_INET2: |
445 | addrsz = sizeof(struct in_addr); |
446 | break; |
447 | case AF_INET624: |
448 | addrsz = sizeof(struct in6_addr); |
449 | break; |
450 | default: |
451 | lwarnx("ignoring invalid RTM_PROPOSAL")logger->warnx("ignoring invalid RTM_PROPOSAL"); |
452 | return; |
453 | } |
454 | |
455 | if ((rtdns->sr_len - 2) % addrsz != 0) { |
456 | lwarnx("ignoring invalid RTM_PROPOSAL")logger->warnx("ignoring invalid RTM_PROPOSAL"); |
457 | return; |
458 | } |
459 | rdns_count = (rtdns->sr_len - |
460 | offsetof(struct sockaddr_rtdns, sr_dns)__builtin_offsetof(struct sockaddr_rtdns, sr_dns)) / addrsz; |
461 | |
462 | /* New proposal from interface means previous proposals expire */ |
463 | for (i = 0; i < ASR_MAXNS10; i++) |
464 | if (learning[i].af == af && |
465 | learning[i].if_index == rtm->rtm_index) |
466 | zeroslot(&learning[i]); |
467 | |
468 | /* Add the new proposals */ |
469 | for (i = 0; i < rdns_count; i++) { |
470 | struct sockaddr_storage ss; |
471 | struct sockaddr_in *sin = (struct sockaddr_in *)&ss; |
472 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&ss; |
473 | int new, err; |
474 | |
475 | memset(&ss, 0, sizeof(ss)); |
476 | ss.ss_family = af; |
477 | new = findslot(learning); |
478 | switch (af) { |
479 | case AF_INET2: |
480 | memcpy(&sin->sin_addr, src, addrsz); |
481 | ss.ss_len = sizeof(*sin); |
482 | break; |
483 | case AF_INET624: |
484 | memcpy(&sin6->sin6_addr, src, addrsz); |
485 | if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)(((&sin6->sin6_addr)->__u6_addr.__u6_addr8[0] == 0xfe ) && (((&sin6->sin6_addr)->__u6_addr.__u6_addr8 [1] & 0xc0) == 0x80))) |
486 | sin6->sin6_scope_id = rtm->rtm_index; |
487 | ss.ss_len = sizeof(*sin6); |
488 | break; |
489 | } |
490 | src += addrsz; |
491 | |
492 | if ((err = getnameinfo((struct sockaddr *)&ss, ss.ss_len, |
493 | learning[new].ip, sizeof(learning[new].ip), |
494 | NULL((void*)0), 0, NI_NUMERICHOST1)) == 0) { |
495 | learning[new].prio = rtm->rtm_priority; |
496 | learning[new].if_index = rtm->rtm_index; |
497 | learning[new].af = af; |
498 | } else |
499 | lwarnx("getnameinfo: %s", gai_strerror(err))logger->warnx("getnameinfo: %s", gai_strerror(err)); |
500 | } |
501 | break; |
502 | default: |
503 | return; |
504 | } |
505 | |
506 | /* Sort proposals, based upon priority and IP */ |
507 | qsort(learning, ASR_MAXNS10, sizeof(learning[0]), cmp); |
508 | |
509 | /* Eliminate duplicates */ |
510 | for (i = 0; i < ASR_MAXNS10 - 1; i++) { |
511 | if (learning[i].prio == 0) |
512 | continue; |
513 | if (learning[i].if_index == learning[i+1].if_index && |
514 | strcmp(learning[i].ip, learning[i+1].ip) == 0) { |
515 | zeroslot(&learning[i + 1]); |
516 | i--; /* backup and re-check */ |
517 | } |
518 | } |
519 | |
520 | /* If proposal result is different, rebuild the file */ |
521 | if (memcmp(learned, learning, sizeof(learned)) != 0) { |
522 | memcpy(learned, learning, sizeof(learned)); |
523 | regen_resolvconf("route proposals"); |
524 | } |
525 | } |
526 | |
527 | #define ROUNDUP(a)((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof (long)) \ |
528 | ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long)) |
529 | |
530 | void |
531 | get_rtaddrs(int addrs, struct sockaddr *sa, struct sockaddr **rti_info) |
532 | { |
533 | int i; |
534 | |
535 | for (i = 0; i < RTAX_MAX15; i++) { |
536 | if (addrs & (1 << i)) { |
537 | rti_info[i] = sa; |
538 | sa = (struct sockaddr *)((char *)(sa) + |
539 | ROUNDUP(sa->sa_len)((sa->sa_len) > 0 ? (1 + (((sa->sa_len) - 1) | (sizeof (long) - 1))) : sizeof(long))); |
540 | } else |
541 | rti_info[i] = NULL((void*)0); |
542 | } |
543 | } |
544 | |
545 | void |
546 | solicit_dns_proposals(int routesock) |
547 | { |
548 | struct rt_msghdr rtm; |
549 | struct iovec iov[1]; |
550 | int iovcnt = 0; |
551 | |
552 | memset(&rtm, 0, sizeof(rtm)); |
553 | |
554 | rtm.rtm_version = RTM_VERSION5; |
555 | rtm.rtm_type = RTM_PROPOSAL0x13; |
556 | rtm.rtm_msglen = sizeof(rtm); |
557 | rtm.rtm_tableid = 0; |
558 | rtm.rtm_index = 0; |
559 | rtm.rtm_seq = arc4random(); |
560 | rtm.rtm_priority = RTP_PROPOSAL_SOLICIT62; |
561 | |
562 | iov[iovcnt].iov_base = &rtm; |
563 | iov[iovcnt++].iov_len = sizeof(rtm); |
564 | |
565 | if (writev(routesock, iov, iovcnt) == -1) |
566 | lwarn("failed to send solicitation")logger->warn("failed to send solicitation"); |
567 | } |
568 | |
569 | void |
570 | regen_resolvconf(char *why) |
571 | { |
572 | int i, fd; |
573 | |
574 | linfo("rebuilding: %s", why)logger->info("rebuilding: %s", why); |
575 | |
576 | if ((fd = open(_PATH_RESCONF_NEW"/etc/resolv.conf.new", O_CREAT0x0200|O_TRUNC0x0400|O_RDWR0x0002, 0644)) == -1) { |
577 | lwarn(_PATH_RESCONF_NEW)logger->warn("/etc/resolv.conf.new"); |
578 | return; |
579 | } |
580 | |
581 | #ifndef SMALL |
582 | if (unwind_running) |
583 | dprintf(fd, "nameserver 127.0.0.1 # resolvd: unwind\n"); |
584 | |
585 | #endif /* SMALL */ |
586 | for (i = 0; i < ASR_MAXNS10; i++) { |
587 | if (learned[i].prio != 0) { |
588 | char ifnambuf[IF_NAMESIZE16], *ifnam; |
589 | |
590 | ifnam = if_indextoname(learned[i].if_index, |
591 | ifnambuf); |
592 | dprintf(fd, "%snameserver %s # resolvd: %s\n", |
593 | #ifndef SMALL |
594 | unwind_running ? "#" : "", |
595 | #else |
596 | "", |
597 | #endif |
598 | learned[i].ip, |
599 | ifnam ? ifnam : ""); |
600 | } |
601 | } |
602 | |
603 | /* Replay user-managed lines from old resolv.conf file */ |
604 | if (resolvfd == -1) |
605 | resolvfd = open(_PATH_RESCONF"/etc/resolv.conf", O_RDWR0x0002); |
606 | if (resolvfd != -1) { |
607 | char *line = NULL((void*)0); |
608 | size_t linesize = 0; |
609 | ssize_t linelen; |
610 | FILE *fp; |
611 | |
612 | lseek(resolvfd, 0, SEEK_SET0); |
613 | fp = fdopen(resolvfd, "r"); |
614 | if (fp == NULL((void*)0)) |
615 | goto err; |
616 | while ((linelen = getline(&line, &linesize, fp)) != -1) { |
617 | char *end = strchr(line, '\n'); |
618 | if (end) |
619 | *end = '\0'; |
620 | if (strstr(line, "# resolvd: ")) |
621 | continue; |
622 | dprintf(fd, "%s\n", line); |
623 | } |
624 | free(line); |
625 | } |
626 | |
627 | if (rename(_PATH_RESCONF_NEW"/etc/resolv.conf.new", _PATH_RESCONF"/etc/resolv.conf") == -1) |
628 | goto err; |
629 | |
630 | if (resolvfd == -1) { |
631 | close(fd); |
632 | resolvfd = open(_PATH_RESCONF"/etc/resolv.conf", O_RDWR0x0002 | O_CREAT0x0200); |
633 | } else { |
634 | dup2(fd, resolvfd); |
635 | close(fd); |
636 | } |
637 | |
638 | newkevent = 1; |
639 | return; |
640 | |
641 | err: |
642 | if (fd != -1) |
643 | close(fd); |
644 | unlink(_PATH_RESCONF_NEW"/etc/resolv.conf.new"); |
645 | } |
646 | |
647 | int |
648 | cmp(const void *a, const void *b) |
649 | { |
650 | const struct rdns_proposal *rpa = a, *rpb = b; |
651 | |
652 | if (rpa->prio == rpb->prio) |
653 | return strcmp(rpa->ip, rpb->ip); |
654 | else |
655 | return rpa->prio < rpb->prio ? -1 : 1; |
656 | } |
657 | |
658 | #ifndef SMALL |
659 | int |
660 | open_unwind_ctl(void) |
661 | { |
662 | static struct sockaddr_un sun; |
663 | int s; |
664 | |
665 | if (sun.sun_family == 0) { |
666 | sun.sun_family = AF_UNIX1; |
667 | strlcpy(sun.sun_path, _PATH_UNWIND_SOCKET"/dev/unwind.sock", sizeof(sun.sun_path)); |
668 | } |
669 | |
670 | if ((s = socket(AF_UNIX1, SOCK_STREAM1, 0)) != -1) { |
671 | if (connect(s, (struct sockaddr *)&sun, sizeof(sun)) == -1) { |
672 | close(s); |
673 | s = -1; |
674 | } |
675 | } |
676 | newkevent = 1; |
677 | return s; |
678 | } |
679 | |
680 | void |
681 | syslog_vstrerror(int e, int priority, const char *fmt, va_list ap) |
682 | { |
683 | char *s; |
684 | |
685 | if (vasprintf(&s, fmt, ap) == -1) { |
686 | syslog(LOG_EMERG0, "unable to alloc in syslog_vstrerror"); |
687 | exit(1); |
688 | } |
689 | syslog(priority, "%s: %s", s, strerror(e)); |
690 | free(s); |
691 | } |
692 | |
693 | __dead__attribute__((__noreturn__)) void |
694 | syslog_err(int ecode, const char *fmt, ...) |
695 | { |
696 | va_list ap; |
697 | |
698 | va_start(ap, fmt)__builtin_va_start(ap, fmt); |
699 | syslog_vstrerror(errno(*__errno()), LOG_CRIT2, fmt, ap); |
700 | va_end(ap)__builtin_va_end(ap); |
701 | exit(ecode); |
702 | } |
703 | |
704 | __dead__attribute__((__noreturn__)) void |
705 | syslog_errx(int ecode, const char *fmt, ...) |
706 | { |
707 | va_list ap; |
708 | |
709 | va_start(ap, fmt)__builtin_va_start(ap, fmt); |
710 | vsyslog(LOG_CRIT2, fmt, ap); |
711 | va_end(ap)__builtin_va_end(ap); |
712 | exit(ecode); |
713 | } |
714 | |
715 | void |
716 | syslog_warn(const char *fmt, ...) |
717 | { |
718 | va_list ap; |
719 | |
720 | va_start(ap, fmt)__builtin_va_start(ap, fmt); |
721 | syslog_vstrerror(errno(*__errno()), LOG_ERR3, fmt, ap); |
722 | va_end(ap)__builtin_va_end(ap); |
723 | } |
724 | |
725 | void |
726 | syslog_warnx(const char *fmt, ...) |
727 | { |
728 | va_list ap; |
729 | |
730 | va_start(ap, fmt)__builtin_va_start(ap, fmt); |
731 | vsyslog(LOG_ERR3, fmt, ap); |
732 | va_end(ap)__builtin_va_end(ap); |
733 | } |
734 | |
735 | void |
736 | syslog_info(const char *fmt, ...) |
737 | { |
738 | va_list ap; |
739 | |
740 | va_start(ap, fmt)__builtin_va_start(ap, fmt); |
741 | vsyslog(LOG_INFO6, fmt, ap); |
742 | va_end(ap)__builtin_va_end(ap); |
743 | } |
744 | |
745 | void |
746 | syslog_debug(const char *fmt, ...) |
747 | { |
748 | va_list ap; |
749 | |
750 | va_start(ap, fmt)__builtin_va_start(ap, fmt); |
751 | vsyslog(LOG_DEBUG7, fmt, ap); |
752 | va_end(ap)__builtin_va_end(ap); |
753 | } |
754 | |
755 | void |
756 | warnx_verbose(const char *fmt, ...) |
757 | { |
758 | va_list ap; |
759 | |
760 | va_start(ap, fmt)__builtin_va_start(ap, fmt); |
761 | if (verbose) |
762 | vwarnx(fmt, ap); |
763 | va_end(ap)__builtin_va_end(ap); |
764 | } |
765 | |
766 | #endif /* SMALL */ |