2 * Copyright (C) 2012-2013 Steven Barth <steven@midlink.org>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License v2 as published by
6 * the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
29 #include <sys/syscall.h>
30 #include <arpa/inet.h>
40 static void sighandler(int signal);
41 static int usage(void);
43 static uint8_t *state_data[_STATE_MAX] = {NULL};
44 static size_t state_len[_STATE_MAX] = {0};
46 static volatile bool signal_io = false;
47 static volatile bool signal_usr1 = false;
48 static volatile bool signal_usr2 = false;
49 static volatile bool signal_term = false;
51 static int urandom_fd = -1, allow_slaac_only = 0;
52 static bool bound = false, release = true;
53 static time_t last_update = 0;
55 int main(_unused int argc, char* const argv[])
57 // Allocate ressources
58 const char *pidfile = NULL;
59 const char *script = "/usr/sbin/odhcp6c-update";
64 enum odhcp6c_ia_mode ia_na_mode = IA_MODE_TRY;
65 enum odhcp6c_ia_mode ia_pd_mode = IA_MODE_TRY;
66 int ia_pd_iaid_index = 0;
67 static struct in6_addr ifid = IN6ADDR_ANY_INIT;
68 int sol_timeout = DHCPV6_SOL_MAX_RT;
71 int bfd_interval = 0, bfd_loss = 3;
74 bool help = false, daemonize = false, strict_options = false;
77 while ((c = getopt(argc, argv, "S::N:P:FB:c:i:r:Rs:kt:hedp:")) != -1) {
80 allow_slaac_only = (optarg) ? atoi(optarg) : -1;
84 if (!strcmp(optarg, "force")) {
85 ia_na_mode = IA_MODE_FORCE;
86 allow_slaac_only = -1;
87 } else if (!strcmp(optarg, "none")) {
88 ia_na_mode = IA_MODE_NONE;
89 } else if (!strcmp(optarg, "try")) {
90 ia_na_mode = IA_MODE_TRY;
97 if (allow_slaac_only >= 0 && allow_slaac_only < 10)
98 allow_slaac_only = 10;
103 int prefix_length = strtoul(optarg, &iaid_begin, 10);
105 if (*iaid_begin != '\0' && *iaid_begin != ',') {
106 syslog(LOG_ERR, "invalid argument: '%s'", optarg);
110 struct odhcp6c_request_prefix prefix = { 0, prefix_length };
112 if (*iaid_begin == ',' && (iaid_len = strlen(iaid_begin)) > 1)
113 memcpy(&prefix.iaid, iaid_begin + 1, iaid_len > 4 ? 4 : iaid_len);
115 prefix.iaid = ++ia_pd_iaid_index;
117 odhcp6c_add_state(STATE_IA_PD_INIT, &prefix, sizeof(prefix));
122 allow_slaac_only = -1;
123 ia_pd_mode = IA_MODE_FORCE;
128 bfd_interval = atoi(optarg);
133 l = script_unhexlify(&buf[4], sizeof(buf) - 4, optarg);
136 buf[1] = DHCPV6_OPT_CLIENTID;
139 odhcp6c_add_state(STATE_CLIENT_ID, buf, l + 4);
146 if (inet_pton(AF_INET6, optarg, &ifid) != 1)
153 opttype = htons(strtoul(optarg, &optpos, 10));
154 if (optpos == optarg)
158 odhcp6c_add_state(STATE_ORO, &opttype, 2);
163 strict_options = true;
175 sol_timeout = atoi(optarg);
179 logopt |= LOG_PERROR;
196 openlog("odhcp6c", logopt, LOG_DAEMON);
197 const char *ifname = argv[optind];
202 signal(SIGIO, sighandler);
203 signal(SIGHUP, sighandler);
204 signal(SIGINT, sighandler);
205 signal(SIGCHLD, sighandler);
206 signal(SIGTERM, sighandler);
207 signal(SIGUSR1, sighandler);
208 signal(SIGUSR2, sighandler);
210 if ((urandom_fd = open("/dev/urandom", O_CLOEXEC | O_RDONLY)) < 0 ||
211 init_dhcpv6(ifname, strict_options, sol_timeout) ||
212 ra_init(ifname, &ifid) || script_init(script, ifname)) {
213 syslog(LOG_ERR, "failed to initialize: %s", strerror(errno));
218 openlog("odhcp6c", LOG_PID, LOG_DAEMON); // Disable LOG_PERROR
220 syslog(LOG_ERR, "Failed to daemonize: %s",
227 snprintf(pidbuf, sizeof(pidbuf),
228 "/var/run/odhcp6c.%s.pid", ifname);
232 int fd = open(pidfile, O_WRONLY | O_CREAT);
235 int len = snprintf(buf, sizeof(buf), "%i\n", getpid());
241 script_call("started");
243 while (!signal_term) { // Main logic
244 odhcp6c_clear_state(STATE_SERVER_ID);
245 odhcp6c_clear_state(STATE_IA_NA);
246 odhcp6c_clear_state(STATE_IA_PD);
247 odhcp6c_clear_state(STATE_SNTP_IP);
248 odhcp6c_clear_state(STATE_NTP_IP);
249 odhcp6c_clear_state(STATE_NTP_FQDN);
250 odhcp6c_clear_state(STATE_SIP_IP);
251 odhcp6c_clear_state(STATE_SIP_FQDN);
252 dhcpv6_set_ia_mode(ia_na_mode, ia_pd_mode);
255 syslog(LOG_NOTICE, "(re)starting transaction on %s", ifname);
257 signal_usr1 = signal_usr2 = false;
258 int mode = dhcpv6_request(DHCPV6_MSG_SOLICIT);
259 odhcp6c_signal_process();
265 int res = dhcpv6_request(mode == DHCPV6_STATELESS ?
266 DHCPV6_MSG_INFO_REQ : DHCPV6_MSG_REQUEST);
267 bool signalled = odhcp6c_signal_process();
271 else if (signalled) {
276 mode = dhcpv6_promote_server_cand();
277 } while (mode > DHCPV6_UNKNOWN);
283 case DHCPV6_STATELESS:
285 syslog(LOG_NOTICE, "entering stateless-mode on %s", ifname);
287 while (!signal_usr2 && !signal_term) {
289 script_call("informed");
291 int res = dhcpv6_poll_reconfigure();
292 odhcp6c_signal_process();
298 signal_usr1 = false; // Acknowledged
301 if (signal_usr2 || signal_term)
304 res = dhcpv6_request(DHCPV6_MSG_INFO_REQ);
305 odhcp6c_signal_process();
313 case DHCPV6_STATEFUL:
314 script_call("bound");
316 syslog(LOG_NOTICE, "entering stateful-mode on %s", ifname);
318 if (bfd_interval > 0)
319 bfd_start(ifname, bfd_loss, bfd_interval);
322 while (!signal_usr2 && !signal_term) {
324 // Wait for T1 to expire or until we get a reconfigure
325 int res = dhcpv6_poll_reconfigure();
326 odhcp6c_signal_process();
328 script_call("updated");
332 // Handle signal, if necessary
334 signal_usr1 = false; // Acknowledged
335 if (signal_usr2 || signal_term)
336 break; // Other signal type
338 // Send renew as T1 expired
339 size_t ia_pd_len, ia_na_len;
340 odhcp6c_get_state(STATE_IA_PD, &ia_pd_len);
341 odhcp6c_get_state(STATE_IA_NA, &ia_na_len);
343 // If we have any IAs, send renew, otherwise request
344 if (ia_pd_len == 0 && ia_na_len == 0)
345 res = dhcpv6_request(DHCPV6_MSG_REQUEST);
347 res = dhcpv6_request(DHCPV6_MSG_RENEW);
349 odhcp6c_signal_process();
350 if (res > 0) { // Renew was succesfull
352 script_call("updated");
353 continue; // Renew was successful
356 odhcp6c_clear_state(STATE_SERVER_ID); // Remove binding
358 // If we have IAs, try rebind otherwise restart
359 res = dhcpv6_request(DHCPV6_MSG_REBIND);
360 odhcp6c_signal_process();
363 script_call("rebound");
377 size_t ia_pd_len, ia_na_len, server_id_len;
378 odhcp6c_get_state(STATE_IA_PD, &ia_pd_len);
379 odhcp6c_get_state(STATE_IA_NA, &ia_na_len);
380 odhcp6c_get_state(STATE_SERVER_ID, &server_id_len);
382 // Add all prefixes to lost prefixes
384 script_call("unbound");
386 if (server_id_len > 0 && (ia_pd_len > 0 || ia_na_len > 0) && release)
387 dhcpv6_request(DHCPV6_MSG_RELEASE);
389 odhcp6c_clear_state(STATE_IA_NA);
390 odhcp6c_clear_state(STATE_IA_PD);
393 script_call("stopped");
398 static int usage(void)
401 "Usage: odhcp6c [options] <interface>\n"
402 "\nFeature options:\n"
403 " -S <time> Wait at least <time> sec for a DHCP-server (0)\n"
404 " -N <mode> Mode for requesting addresses [try|force|none]\n"
405 " -P <length> Request IPv6-Prefix (0 = auto)\n"
406 " -F Force IPv6-Prefix\n"
408 " -B <interval> Enable BFD ping check\n"
410 " -c <clientid> Override client-ID (base-16 encoded)\n"
411 " -i <iface-id> Use a custom interface identifier for RA handling\n"
412 " -r <options> Options to be requested (comma-separated)\n"
413 " -R Do not request any options except those specified with -r\n"
414 " -s <script> Status update script (/usr/sbin/odhcp6c-update)\n"
415 " -k Don't send a RELEASE when stopping\n"
416 " -t <seconds> Maximum timeout for DHCPv6-SOLICIT (120)\n"
417 "\nInvocation options:\n"
418 " -p <pidfile> Set pidfile (/var/run/6relayd.pid)\n"
420 " -e Write logmessages to stderr\n"
421 //" -v Increase logging verbosity\n"
422 " -h Show this help\n\n";
423 write(STDERR_FILENO, buf, sizeof(buf));
428 // Don't want to pull-in librt and libpthread just for a monotonic clock...
429 uint64_t odhcp6c_get_milli_time(void)
431 struct timespec t = {0, 0};
432 syscall(SYS_clock_gettime, CLOCK_MONOTONIC, &t);
433 return t.tv_sec * 1000 + t.tv_nsec / 1000000;
437 static uint8_t* odhcp6c_resize_state(enum odhcp6c_state state, ssize_t len)
440 return state_data[state] + state_len[state];
441 else if (state_len[state] + len > 1024)
444 uint8_t *n = realloc(state_data[state], state_len[state] + len);
445 if (n || state_len[state] + len == 0) {
446 state_data[state] = n;
447 n += state_len[state];
448 state_len[state] += len;
454 bool odhcp6c_signal_process(void)
459 bool ra_updated = ra_process();
464 if (ra_updated && (bound || allow_slaac_only == 0))
465 script_call("ra-updated"); // Immediate process urgent events
466 else if (ra_updated && !bound && allow_slaac_only > 0)
467 script_delay_call("ra-updated", allow_slaac_only);
474 return signal_usr1 || signal_usr2 || signal_term;
478 void odhcp6c_clear_state(enum odhcp6c_state state)
480 state_len[state] = 0;
484 void odhcp6c_add_state(enum odhcp6c_state state, const void *data, size_t len)
486 uint8_t *n = odhcp6c_resize_state(state, len);
488 memcpy(n, data, len);
491 void odhcp6c_insert_state(enum odhcp6c_state state, size_t offset, const void *data, size_t len)
493 ssize_t len_after = state_len[state] - offset;
497 uint8_t *n = odhcp6c_resize_state(state, len);
499 uint8_t *sdata = state_data[state];
501 memmove(sdata + offset + len, sdata + offset, len_after);
502 memcpy(sdata + offset, data, len);
506 size_t odhcp6c_remove_state(enum odhcp6c_state state, size_t offset, size_t len)
508 uint8_t *data = state_data[state];
509 ssize_t len_after = state_len[state] - (offset + len);
511 return state_len[state];
513 memmove(data + offset, data + offset + len, len_after);
514 return state_len[state] -= len;
518 void* odhcp6c_move_state(enum odhcp6c_state state, size_t *len)
520 *len = state_len[state];
521 void *data = state_data[state];
523 state_len[state] = 0;
524 state_data[state] = NULL;
530 void* odhcp6c_get_state(enum odhcp6c_state state, size_t *len)
532 *len = state_len[state];
533 return state_data[state];
537 struct odhcp6c_entry* odhcp6c_find_entry(enum odhcp6c_state state, const struct odhcp6c_entry *new)
539 size_t len, cmplen = offsetof(struct odhcp6c_entry, target) + new->length / 8;
540 struct odhcp6c_entry *start = odhcp6c_get_state(state, &len);
541 struct odhcp6c_entry *x = NULL;
543 for (struct odhcp6c_entry *c = start; !x && c < &start[len/sizeof(*c)]; ++c)
544 if (!memcmp(c, new, cmplen))
551 bool odhcp6c_update_entry_safe(enum odhcp6c_state state, struct odhcp6c_entry *new, uint32_t safe)
554 struct odhcp6c_entry *x = odhcp6c_find_entry(state, new);
555 struct odhcp6c_entry *start = odhcp6c_get_state(state, &len);
557 if (x && x->valid > new->valid && new->valid < safe)
560 if (new->valid > 0) {
562 if (new->valid >= x->valid && new->valid - x->valid < 60 &&
563 new->preferred >= x->preferred &&
564 new->preferred - x->preferred < 60 &&
565 x->class == new->class)
567 x->valid = new->valid;
568 x->preferred = new->preferred;
571 x->class = new->class;
574 odhcp6c_add_state(state, new, sizeof(*new));
577 odhcp6c_remove_state(state, (x - start) * sizeof(*x), sizeof(*x));
583 bool odhcp6c_update_entry(enum odhcp6c_state state, struct odhcp6c_entry *new)
585 return odhcp6c_update_entry_safe(state, new, 0);
589 static void odhcp6c_expire_list(enum odhcp6c_state state, uint32_t elapsed)
592 struct odhcp6c_entry *start = odhcp6c_get_state(state, &len);
593 for (struct odhcp6c_entry *c = start; c < &start[len / sizeof(*c)]; ++c) {
596 else if (c->t1 != UINT32_MAX)
601 else if (c->t2 != UINT32_MAX)
604 if (c->preferred < elapsed)
606 else if (c->preferred != UINT32_MAX)
607 c->preferred -= elapsed;
609 if (c->valid < elapsed)
611 else if (c->valid != UINT32_MAX)
615 odhcp6c_remove_state(state, (c - start) * sizeof(*c), sizeof(*c));
620 void odhcp6c_expire(void)
622 time_t now = odhcp6c_get_milli_time() / 1000;
623 uint32_t elapsed = (last_update > 0) ? now - last_update : 0;
626 odhcp6c_expire_list(STATE_RA_PREFIX, elapsed);
627 odhcp6c_expire_list(STATE_RA_ROUTE, elapsed);
628 odhcp6c_expire_list(STATE_RA_DNS, elapsed);
629 odhcp6c_expire_list(STATE_IA_NA, elapsed);
630 odhcp6c_expire_list(STATE_IA_PD, elapsed);
634 uint32_t odhcp6c_elapsed(void)
636 return odhcp6c_get_milli_time() / 1000 - last_update;
640 void odhcp6c_random(void *buf, size_t len)
642 read(urandom_fd, buf, len);
645 bool odhcp6c_is_bound(void)
650 static void sighandler(int signal)
652 if (signal == SIGCHLD)
653 while (waitpid(-1, NULL, WNOHANG) > 0);
654 else if (signal == SIGUSR1)
656 else if (signal == SIGUSR2)
658 else if (signal == SIGIO)