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 = 15;
44 static bool bound = false, release = true;
47 int main(_unused int argc, char* const argv[])
49 // Allocate ressources
50 const char *pidfile = NULL;
51 const char *script = "/usr/sbin/odhcp6c-update";
56 enum odhcp6c_ia_mode ia_na_mode = IA_MODE_TRY;
58 bool help = false, daemonize = false;
60 int c, request_pd = 0;
61 while ((c = getopt(argc, argv, "S::N:P:c:r:s:khedp:")) != -1) {
64 allow_slaac_only = (optarg) ? atoi(optarg) : -1;
68 if (!strcmp(optarg, "force"))
69 ia_na_mode = IA_MODE_FORCE;
70 else if (!strcmp(optarg, "none"))
71 ia_na_mode = IA_MODE_NONE;
72 else if (!strcmp(optarg, "try"))
73 ia_na_mode = IA_MODE_TRY;
79 request_pd = strtoul(optarg, NULL, 10);
85 l = script_unhexlify(&buf[4], sizeof(buf) - 4, optarg);
88 buf[1] = DHCPV6_OPT_CLIENTID;
91 odhcp6c_add_state(STATE_CLIENT_ID, buf, l + 4);
100 opttype = htons(strtoul(optarg, &optpos, 10));
101 if (optpos == optarg)
105 odhcp6c_add_state(STATE_ORO, &opttype, 2);
118 logopt |= LOG_PERROR;
135 openlog("odhcp6c", logopt, LOG_DAEMON);
136 const char *ifname = argv[optind];
141 signal(SIGIO, sighandler);
142 signal(SIGHUP, sighandler);
143 signal(SIGINT, sighandler);
144 signal(SIGCHLD, sighandler);
145 signal(SIGTERM, sighandler);
146 signal(SIGUSR1, sighandler);
147 signal(SIGUSR2, sighandler);
149 if ((urandom_fd = open("/dev/urandom", O_CLOEXEC | O_RDONLY)) < 0 ||
150 init_dhcpv6(ifname, request_pd) || ra_init(ifname) ||
151 script_init(script, ifname)) {
152 syslog(LOG_ERR, "failed to initialize: %s", strerror(errno));
157 openlog("odhcp6c", LOG_PID, LOG_DAEMON); // Disable LOG_PERROR
159 syslog(LOG_ERR, "Failed to daemonize: %s",
166 snprintf(pidbuf, sizeof(pidbuf),
167 "/var/run/odhcp6c.%s.pid", ifname);
171 int fd = open(pidfile, O_WRONLY | O_CREAT);
174 int len = snprintf(buf, sizeof(buf), "%i\n", getpid());
180 script_call("started");
182 while (do_signal != SIGTERM) { // Main logic
183 odhcp6c_clear_state(STATE_SERVER_ID);
184 odhcp6c_clear_state(STATE_SERVER_CAND);
185 odhcp6c_clear_state(STATE_IA_PD);
186 odhcp6c_clear_state(STATE_SNTP_IP);
187 odhcp6c_clear_state(STATE_SNTP_FQDN);
188 odhcp6c_clear_state(STATE_SIP_IP);
189 odhcp6c_clear_state(STATE_SIP_FQDN);
190 dhcpv6_set_ia_na_mode(ia_na_mode);
193 syslog(LOG_NOTICE, "(re)starting transaction on %s", ifname);
196 int res = dhcpv6_request(DHCPV6_MSG_SOLICIT);
197 odhcp6c_signal_process();
200 continue; // Might happen if we got a signal
201 } else if (res == DHCPV6_STATELESS) { // Stateless mode
202 while (do_signal == 0 || do_signal == SIGUSR1) {
205 res = dhcpv6_request(DHCPV6_MSG_INFO_REQ);
206 odhcp6c_signal_process();
207 if (do_signal == SIGUSR1)
212 script_call("informed");
215 syslog(LOG_NOTICE, "entering stateless-mode on %s", ifname);
217 if (dhcpv6_poll_reconfigure() > 0)
218 script_call("informed");
225 if (dhcpv6_request(DHCPV6_MSG_REQUEST) < 0)
228 odhcp6c_signal_process();
229 script_call("bound");
231 syslog(LOG_NOTICE, "entering stateful-mode on %s", ifname);
233 while (do_signal == 0 || do_signal == SIGUSR1) {
235 // Wait for T1 to expire or until we get a reconfigure
236 int res = dhcpv6_poll_reconfigure();
237 odhcp6c_signal_process();
240 script_call("updated");
245 // Handle signal, if necessary
246 if (do_signal == SIGUSR1)
247 do_signal = 0; // Acknowledged
248 else if (do_signal > 0)
249 break; // Other signal type
251 size_t ia_pd_len, ia_na_len, ia_pd_new, ia_na_new;
252 odhcp6c_get_state(STATE_IA_PD, &ia_pd_len);
253 odhcp6c_get_state(STATE_IA_NA, &ia_na_len);
255 // If we have any IAs, send renew, otherwise request
257 if (ia_pd_len == 0 && ia_na_len == 0)
258 r = dhcpv6_request(DHCPV6_MSG_REQUEST);
260 r = dhcpv6_request(DHCPV6_MSG_RENEW);
261 odhcp6c_signal_process();
262 if (r > 0) // Publish updates
263 script_call("updated");
265 continue; // Renew was successful
267 odhcp6c_clear_state(STATE_SERVER_ID); // Remove binding
269 // If we have IAs, try rebind otherwise restart
270 res = dhcpv6_request(DHCPV6_MSG_REBIND);
271 odhcp6c_signal_process();
273 odhcp6c_get_state(STATE_IA_PD, &ia_pd_new);
274 odhcp6c_get_state(STATE_IA_NA, &ia_na_new);
275 if (res < 0 || (ia_pd_new == 0 && ia_pd_len) ||
276 (ia_na_new == 0 && ia_na_len))
277 break; // We lost all our IAs, restart
279 script_call("rebound");
283 size_t ia_pd_len, ia_na_len, server_id_len;
284 odhcp6c_get_state(STATE_IA_PD, &ia_pd_len);
285 odhcp6c_get_state(STATE_IA_NA, &ia_na_len);
286 odhcp6c_get_state(STATE_SERVER_ID, &server_id_len);
288 // Add all prefixes to lost prefixes
290 script_call("unbound");
292 if (server_id_len > 0 && (ia_pd_len > 0 || ia_na_len > 0) && release)
293 dhcpv6_request(DHCPV6_MSG_RELEASE);
295 odhcp6c_clear_state(STATE_IA_NA);
296 odhcp6c_clear_state(STATE_IA_PD);
299 script_call("stopped");
304 static int usage(void)
307 "Usage: odhcp6c [options] <interface>\n"
308 "\nFeature options:\n"
309 " -S <time> Wait at least <time> sec for a DHCP-server (15)\n"
310 " -N <mode> Mode for requesting addresses [try|force|none]\n"
311 " -P <length> Request IPv6-Prefix (0 = auto)\n"
312 " -c <clientid> Override client-ID (base-16 encoded)\n"
313 " -r <options> Options to be requested (comma-separated)\n"
314 " -s <script> Status update script (/usr/sbin/odhcp6c-update)\n"
315 " -k Don't send a RELEASE when stopping\n"
316 "\nInvocation options:\n"
317 " -p <pidfile> Set pidfile (/var/run/6relayd.pid)\n"
319 " -e Write logmessages to stderr\n"
320 //" -v Increase logging verbosity\n"
321 " -h Show this help\n\n";
322 write(STDERR_FILENO, buf, sizeof(buf));
327 // Don't want to pull-in librt and libpthread just for a monotonic clock...
328 uint64_t odhcp6c_get_milli_time(void)
330 struct timespec t = {0, 0};
331 syscall(SYS_clock_gettime, CLOCK_MONOTONIC, &t);
332 return t.tv_sec * 1000 + t.tv_nsec / 1000000;
336 static uint8_t* odhcp6c_resize_state(enum odhcp6c_state state, ssize_t len)
339 return state_data[state] + state_len[state];
340 else if (state_len[state] + len > 1024)
343 uint8_t *n = realloc(state_data[state], state_len[state] + len);
344 if (n || state_len[state] + len == 0) {
345 state_data[state] = n;
346 n += state_len[state];
347 state_len[state] += len;
353 bool odhcp6c_signal_process(void)
355 if (do_signal == SIGIO) {
357 bool ra_updated = ra_process();
359 if (ra_rtnl_process() || (ra_updated && (bound || allow_slaac_only == 0)))
360 script_call("ra-updated"); // Immediate process urgent events
361 else if (ra_updated && !bound && allow_slaac_only > 0)
362 script_delay_call("ra-updated", allow_slaac_only);
365 return do_signal != 0;
369 void odhcp6c_clear_state(enum odhcp6c_state state)
371 state_len[state] = 0;
375 void odhcp6c_add_state(enum odhcp6c_state state, const void *data, size_t len)
377 uint8_t *n = odhcp6c_resize_state(state, len);
379 memcpy(n, data, len);
383 size_t odhcp6c_remove_state(enum odhcp6c_state state, size_t offset, size_t len)
385 uint8_t *data = state_data[state];
386 ssize_t len_after = state_len[state] - (offset + len);
388 return state_len[state];
390 memmove(data + offset, data + offset + len, len_after);
391 return state_len[state] -= len;
395 void* odhcp6c_get_state(enum odhcp6c_state state, size_t *len)
397 *len = state_len[state];
398 return state_data[state];
402 struct odhcp6c_entry* odhcp6c_find_entry(enum odhcp6c_state state, const struct odhcp6c_entry *new)
404 size_t len, cmplen = offsetof(struct odhcp6c_entry, target) + new->length / 8;
405 struct odhcp6c_entry *start = odhcp6c_get_state(state, &len);
406 struct odhcp6c_entry *x = NULL;
408 for (struct odhcp6c_entry *c = start; !x && c < &start[len/sizeof(*c)]; ++c)
409 if (!memcmp(c, new, cmplen))
416 void odhcp6c_update_entry_safe(enum odhcp6c_state state, struct odhcp6c_entry *new, uint32_t safe)
419 struct odhcp6c_entry *x = odhcp6c_find_entry(state, new);
420 struct odhcp6c_entry *start = odhcp6c_get_state(state, &len);
422 if (x && x->valid > new->valid && new->valid < safe)
425 if (new->valid > 0) {
427 x->valid = new->valid;
428 x->preferred = new->preferred;
430 odhcp6c_add_state(state, new, sizeof(*new));
433 odhcp6c_remove_state(state, (x - start) * sizeof(*x), sizeof(*x));
438 void odhcp6c_update_entry(enum odhcp6c_state state, struct odhcp6c_entry *new)
440 odhcp6c_update_entry_safe(state, new, 0);
444 static void odhcp6c_expire_list(enum odhcp6c_state state, uint32_t elapsed)
447 struct odhcp6c_entry *start = odhcp6c_get_state(state, &len);
448 for (struct odhcp6c_entry *c = start; c < &start[len / sizeof(*c)]; ++c) {
449 if (c->preferred < elapsed)
451 else if (c->preferred != UINT32_MAX)
452 c->preferred -= elapsed;
454 if (c->valid < elapsed)
456 else if (c->valid != UINT32_MAX)
460 odhcp6c_remove_state(state, (c - start) * sizeof(*c), sizeof(*c));
465 void odhcp6c_expire(void)
467 static time_t last_update = 0;
468 time_t now = odhcp6c_get_milli_time() / 1000;
470 uint32_t elapsed = now - last_update;
473 odhcp6c_expire_list(STATE_RA_PREFIX, elapsed);
474 odhcp6c_expire_list(STATE_RA_ROUTE, elapsed);
475 odhcp6c_expire_list(STATE_RA_DNS, elapsed);
476 odhcp6c_expire_list(STATE_IA_NA, elapsed);
477 odhcp6c_expire_list(STATE_IA_PD, elapsed);
481 void odhcp6c_random(void *buf, size_t len)
483 read(urandom_fd, buf, len);
487 static void sighandler(int signal)
489 if (signal == SIGCHLD)
490 while (waitpid(-1, NULL, WNOHANG) > 0);
491 else if (signal == SIGUSR1)
493 else if (signal == SIGUSR2)
495 else if (signal == SIGIO)