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>
35 static void sighandler(int signal);
36 static int usage(void);
39 static uint8_t *state_data[_STATE_MAX] = {NULL};
40 static size_t state_len[_STATE_MAX] = {0};
42 static volatile int do_signal = 0;
43 static int urandom_fd = -1, allow_slaac_only = 0;
44 static bool bound = false, release = true;
45 static time_t last_update = 0;
48 int main(_unused int argc, char* const argv[])
50 // Allocate ressources
51 const char *pidfile = NULL;
52 const char *script = "/usr/sbin/odhcp6c-update";
57 enum odhcp6c_ia_mode ia_na_mode = IA_MODE_TRY;
59 bool help = false, daemonize = false;
61 int c, request_pd = 0;
62 while ((c = getopt(argc, argv, "S::N:P:c:r:s:khedp:")) != -1) {
65 allow_slaac_only = (optarg) ? atoi(optarg) : -1;
69 if (!strcmp(optarg, "force"))
70 ia_na_mode = IA_MODE_FORCE;
71 else if (!strcmp(optarg, "none"))
72 ia_na_mode = IA_MODE_NONE;
73 else if (!strcmp(optarg, "try"))
74 ia_na_mode = IA_MODE_TRY;
80 if (allow_slaac_only >= 0 && allow_slaac_only < 10)
81 allow_slaac_only = 10;
83 request_pd = strtoul(optarg, NULL, 10);
89 l = script_unhexlify(&buf[4], sizeof(buf) - 4, optarg);
92 buf[1] = DHCPV6_OPT_CLIENTID;
95 odhcp6c_add_state(STATE_CLIENT_ID, buf, l + 4);
104 opttype = htons(strtoul(optarg, &optpos, 10));
105 if (optpos == optarg)
109 odhcp6c_add_state(STATE_ORO, &opttype, 2);
122 logopt |= LOG_PERROR;
139 openlog("odhcp6c", logopt, LOG_DAEMON);
140 const char *ifname = argv[optind];
145 signal(SIGIO, sighandler);
146 signal(SIGHUP, sighandler);
147 signal(SIGINT, sighandler);
148 signal(SIGCHLD, sighandler);
149 signal(SIGTERM, sighandler);
150 signal(SIGUSR1, sighandler);
151 signal(SIGUSR2, sighandler);
153 if ((urandom_fd = open("/dev/urandom", O_CLOEXEC | O_RDONLY)) < 0 ||
154 init_dhcpv6(ifname, request_pd) || ra_init(ifname) ||
155 script_init(script, ifname)) {
156 syslog(LOG_ERR, "failed to initialize: %s", strerror(errno));
161 openlog("odhcp6c", LOG_PID, LOG_DAEMON); // Disable LOG_PERROR
163 syslog(LOG_ERR, "Failed to daemonize: %s",
170 snprintf(pidbuf, sizeof(pidbuf),
171 "/var/run/odhcp6c.%s.pid", ifname);
175 int fd = open(pidfile, O_WRONLY | O_CREAT);
178 int len = snprintf(buf, sizeof(buf), "%i\n", getpid());
184 script_call("started");
186 while (do_signal != SIGTERM) { // Main logic
187 odhcp6c_clear_state(STATE_SERVER_ID);
188 odhcp6c_clear_state(STATE_SERVER_CAND);
189 odhcp6c_clear_state(STATE_IA_PD);
190 odhcp6c_clear_state(STATE_SNTP_IP);
191 odhcp6c_clear_state(STATE_SNTP_FQDN);
192 odhcp6c_clear_state(STATE_SIP_IP);
193 odhcp6c_clear_state(STATE_SIP_FQDN);
194 dhcpv6_set_ia_na_mode(ia_na_mode);
197 syslog(LOG_NOTICE, "(re)starting transaction on %s", ifname);
200 int res = dhcpv6_request(DHCPV6_MSG_SOLICIT);
201 odhcp6c_signal_process();
204 continue; // Might happen if we got a signal
205 } else if (res == DHCPV6_STATELESS) { // Stateless mode
206 while (do_signal == 0 || do_signal == SIGUSR1) {
209 res = dhcpv6_request(DHCPV6_MSG_INFO_REQ);
210 odhcp6c_signal_process();
211 if (do_signal == SIGUSR1)
216 script_call("informed");
219 syslog(LOG_NOTICE, "entering stateless-mode on %s", ifname);
221 if (dhcpv6_poll_reconfigure() > 0)
222 script_call("informed");
229 if (dhcpv6_request(DHCPV6_MSG_REQUEST) < 0)
232 odhcp6c_signal_process();
233 script_call("bound");
235 syslog(LOG_NOTICE, "entering stateful-mode on %s", ifname);
237 while (do_signal == 0 || do_signal == SIGUSR1) {
239 // Wait for T1 to expire or until we get a reconfigure
240 int res = dhcpv6_poll_reconfigure();
241 odhcp6c_signal_process();
244 script_call("updated");
249 // Handle signal, if necessary
250 if (do_signal == SIGUSR1)
251 do_signal = 0; // Acknowledged
252 else if (do_signal > 0)
253 break; // Other signal type
255 size_t ia_pd_len, ia_na_len, ia_pd_new, ia_na_new;
256 odhcp6c_get_state(STATE_IA_PD, &ia_pd_len);
257 odhcp6c_get_state(STATE_IA_NA, &ia_na_len);
259 // If we have any IAs, send renew, otherwise request
261 if (ia_pd_len == 0 && ia_na_len == 0)
262 r = dhcpv6_request(DHCPV6_MSG_REQUEST);
264 r = dhcpv6_request(DHCPV6_MSG_RENEW);
265 odhcp6c_signal_process();
266 if (r > 0) // Publish updates
267 script_call("updated");
269 continue; // Renew was successful
271 odhcp6c_clear_state(STATE_SERVER_ID); // Remove binding
273 // If we have IAs, try rebind otherwise restart
274 res = dhcpv6_request(DHCPV6_MSG_REBIND);
275 odhcp6c_signal_process();
277 odhcp6c_get_state(STATE_IA_PD, &ia_pd_new);
278 odhcp6c_get_state(STATE_IA_NA, &ia_na_new);
279 if (res < 0 || (ia_pd_new == 0 && ia_pd_len) ||
280 (ia_na_new == 0 && ia_na_len))
281 break; // We lost all our IAs, restart
283 script_call("rebound");
287 size_t ia_pd_len, ia_na_len, server_id_len;
288 odhcp6c_get_state(STATE_IA_PD, &ia_pd_len);
289 odhcp6c_get_state(STATE_IA_NA, &ia_na_len);
290 odhcp6c_get_state(STATE_SERVER_ID, &server_id_len);
292 // Add all prefixes to lost prefixes
294 script_call("unbound");
296 if (server_id_len > 0 && (ia_pd_len > 0 || ia_na_len > 0) && release)
297 dhcpv6_request(DHCPV6_MSG_RELEASE);
299 odhcp6c_clear_state(STATE_IA_NA);
300 odhcp6c_clear_state(STATE_IA_PD);
303 script_call("stopped");
308 static int usage(void)
311 "Usage: odhcp6c [options] <interface>\n"
312 "\nFeature options:\n"
313 " -S <time> Wait at least <time> sec for a DHCP-server (0)\n"
314 " -N <mode> Mode for requesting addresses [try|force|none]\n"
315 " -P <length> Request IPv6-Prefix (0 = auto)\n"
316 " -c <clientid> Override client-ID (base-16 encoded)\n"
317 " -r <options> Options to be requested (comma-separated)\n"
318 " -s <script> Status update script (/usr/sbin/odhcp6c-update)\n"
319 " -k Don't send a RELEASE when stopping\n"
320 "\nInvocation options:\n"
321 " -p <pidfile> Set pidfile (/var/run/6relayd.pid)\n"
323 " -e Write logmessages to stderr\n"
324 //" -v Increase logging verbosity\n"
325 " -h Show this help\n\n";
326 write(STDERR_FILENO, buf, sizeof(buf));
331 // Don't want to pull-in librt and libpthread just for a monotonic clock...
332 uint64_t odhcp6c_get_milli_time(void)
334 struct timespec t = {0, 0};
335 syscall(SYS_clock_gettime, CLOCK_MONOTONIC, &t);
336 return t.tv_sec * 1000 + t.tv_nsec / 1000000;
340 static uint8_t* odhcp6c_resize_state(enum odhcp6c_state state, ssize_t len)
343 return state_data[state] + state_len[state];
344 else if (state_len[state] + len > 1024)
347 uint8_t *n = realloc(state_data[state], state_len[state] + len);
348 if (n || state_len[state] + len == 0) {
349 state_data[state] = n;
350 n += state_len[state];
351 state_len[state] += len;
357 bool odhcp6c_signal_process(void)
359 if (do_signal == SIGIO) {
361 bool ra_rtnled = ra_rtnl_process();
362 bool ra_updated = ra_process();
364 if (ra_rtnled || (ra_updated && (bound || allow_slaac_only == 0)))
365 script_call("ra-updated"); // Immediate process urgent events
366 else if (ra_updated && !bound && allow_slaac_only > 0)
367 script_delay_call("ra-updated", allow_slaac_only);
370 return do_signal != 0;
374 void odhcp6c_clear_state(enum odhcp6c_state state)
376 state_len[state] = 0;
380 void odhcp6c_add_state(enum odhcp6c_state state, const void *data, size_t len)
382 uint8_t *n = odhcp6c_resize_state(state, len);
384 memcpy(n, data, len);
388 size_t odhcp6c_remove_state(enum odhcp6c_state state, size_t offset, size_t len)
390 uint8_t *data = state_data[state];
391 ssize_t len_after = state_len[state] - (offset + len);
393 return state_len[state];
395 memmove(data + offset, data + offset + len, len_after);
396 return state_len[state] -= len;
400 void* odhcp6c_get_state(enum odhcp6c_state state, size_t *len)
402 *len = state_len[state];
403 return state_data[state];
407 struct odhcp6c_entry* odhcp6c_find_entry(enum odhcp6c_state state, const struct odhcp6c_entry *new)
409 size_t len, cmplen = offsetof(struct odhcp6c_entry, target) + new->length / 8;
410 struct odhcp6c_entry *start = odhcp6c_get_state(state, &len);
411 struct odhcp6c_entry *x = NULL;
413 for (struct odhcp6c_entry *c = start; !x && c < &start[len/sizeof(*c)]; ++c)
414 if (!memcmp(c, new, cmplen))
421 void odhcp6c_update_entry_safe(enum odhcp6c_state state, struct odhcp6c_entry *new, uint32_t safe)
424 struct odhcp6c_entry *x = odhcp6c_find_entry(state, new);
425 struct odhcp6c_entry *start = odhcp6c_get_state(state, &len);
427 if (x && x->valid > new->valid && new->valid < safe)
430 if (new->valid > 0) {
432 x->valid = new->valid;
433 x->preferred = new->preferred;
435 odhcp6c_add_state(state, new, sizeof(*new));
438 odhcp6c_remove_state(state, (x - start) * sizeof(*x), sizeof(*x));
443 void odhcp6c_update_entry(enum odhcp6c_state state, struct odhcp6c_entry *new)
445 odhcp6c_update_entry_safe(state, new, 0);
449 static void odhcp6c_expire_list(enum odhcp6c_state state, uint32_t elapsed)
452 struct odhcp6c_entry *start = odhcp6c_get_state(state, &len);
453 for (struct odhcp6c_entry *c = start; c < &start[len / sizeof(*c)]; ++c) {
454 if (c->preferred < elapsed)
456 else if (c->preferred != UINT32_MAX)
457 c->preferred -= elapsed;
459 if (c->valid < elapsed)
461 else if (c->valid != UINT32_MAX)
465 odhcp6c_remove_state(state, (c - start) * sizeof(*c), sizeof(*c));
470 void odhcp6c_expire(void)
472 time_t now = odhcp6c_get_milli_time() / 1000;
473 uint32_t elapsed = (last_update > 0) ? now - last_update : 0;
476 odhcp6c_expire_list(STATE_RA_PREFIX, elapsed);
477 odhcp6c_expire_list(STATE_RA_ROUTE, elapsed);
478 odhcp6c_expire_list(STATE_RA_DNS, elapsed);
479 odhcp6c_expire_list(STATE_IA_NA, elapsed);
480 odhcp6c_expire_list(STATE_IA_PD, elapsed);
484 uint32_t odhcp6c_elapsed(void)
486 return odhcp6c_get_milli_time() / 1000 - last_update;
490 void odhcp6c_random(void *buf, size_t len)
492 read(urandom_fd, buf, len);
496 static void sighandler(int signal)
498 if (signal == SIGCHLD)
499 while (waitpid(-1, NULL, WNOHANG) > 0);
500 else if (signal == SIGUSR1)
502 else if (signal == SIGUSR2)
504 else if (signal == SIGIO)