2 * Copyright (C) 2012 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;
44 static bool bound = false;
47 int main(_unused int argc, char* const argv[])
49 openlog("odhcp6c", LOG_PERROR | LOG_PID, LOG_DAEMON);
51 // Allocate ressources
52 const char *pidfile = NULL;
53 const char *script = "/usr/sbin/odhcp6c-update";
58 enum odhcp6c_ia_mode ia_na_mode = IA_MODE_TRY;
60 bool help = false, daemonize = false;
61 int c, request_pd = 0;
62 while ((c = getopt(argc, argv, "N:P:c:r:s:hdp:")) != -1) {
65 if (!strcmp(optarg, "force"))
66 ia_na_mode = IA_MODE_FORCE;
67 else if (!strcmp(optarg, "none"))
68 ia_na_mode = IA_MODE_NONE;
69 else if (!strcmp(optarg, "try"))
70 ia_na_mode = IA_MODE_TRY;
76 request_pd = strtoul(optarg, NULL, 10);
82 l = script_unhexlify(&buf[4], sizeof(buf) - 4, optarg);
85 buf[1] = DHCPV6_OPT_CLIENTID;
88 odhcp6c_add_state(STATE_CLIENT_ID, buf, l + 4);
97 opttype = htons(strtoul(optarg, &optpos, 10));
102 odhcp6c_add_state(STATE_ORO, &opttype, 2);
124 const char *ifname = argv[optind];
129 if ((urandom_fd = open("/dev/urandom", O_CLOEXEC | O_RDONLY)) < 0 ||
130 init_dhcpv6(ifname, request_pd) || ra_init(ifname) ||
131 script_init(script, ifname)) {
132 syslog(LOG_ERR, "failed to initialize: %s", strerror(errno));
136 signal(SIGIO, sighandler);
137 signal(SIGHUP, sighandler);
138 signal(SIGINT, sighandler);
139 signal(SIGCHLD, sighandler);
140 signal(SIGTERM, sighandler);
141 signal(SIGUSR1, sighandler);
142 signal(SIGUSR2, sighandler);
145 openlog("odhcp6c", LOG_PID, LOG_DAEMON); // Disable LOG_PERROR
147 syslog(LOG_ERR, "Failed to daemonize: %s",
154 snprintf(pidbuf, sizeof(pidbuf),
155 "/var/run/odhcp6c.%s.pid", ifname);
159 int fd = open(pidfile, O_WRONLY | O_CREAT);
162 int len = snprintf(buf, sizeof(buf), "%i\n", getpid());
168 script_call("started");
170 while (do_signal != SIGTERM) { // Main logic
171 odhcp6c_clear_state(STATE_SERVER_ID);
172 odhcp6c_clear_state(STATE_SERVER_CAND);
173 odhcp6c_clear_state(STATE_IA_PD);
174 odhcp6c_clear_state(STATE_SNTP_IP);
175 odhcp6c_clear_state(STATE_SNTP_FQDN);
176 odhcp6c_clear_state(STATE_SIP_IP);
177 odhcp6c_clear_state(STATE_SIP_FQDN);
178 dhcpv6_set_ia_na_mode(ia_na_mode);
182 int res = dhcpv6_request(DHCPV6_MSG_SOLICIT);
185 continue; // Might happen if we got a signal
186 } else if (res == DHCPV6_STATELESS) { // Stateless mode
187 while (do_signal == 0 || do_signal == SIGUSR1) {
190 res = dhcpv6_request(DHCPV6_MSG_INFO_REQ);
191 if (do_signal == SIGUSR1)
196 script_call("informed");
200 if (dhcpv6_poll_reconfigure() > 0)
201 script_call("informed");
208 if (dhcpv6_request(DHCPV6_MSG_REQUEST) < 0)
211 script_call("bound");
214 while (do_signal == 0 || do_signal == SIGUSR1) {
216 // Wait for T1 to expire or until we get a reconfigure
217 int res = dhcpv6_poll_reconfigure();
220 script_call("updated");
225 // Handle signal, if necessary
226 if (do_signal == SIGUSR1)
227 do_signal = 0; // Acknowledged
228 else if (do_signal > 0)
229 break; // Other signal type
231 size_t ia_pd_len, ia_na_len, ia_pd_new, ia_na_new;
232 odhcp6c_get_state(STATE_IA_PD, &ia_pd_len);
233 odhcp6c_get_state(STATE_IA_NA, &ia_na_len);
235 // If we have any IAs, send renew, otherwise request
237 if (ia_pd_len == 0 && ia_na_len == 0)
238 r = dhcpv6_request(DHCPV6_MSG_REQUEST);
240 r = dhcpv6_request(DHCPV6_MSG_RENEW);
241 if (r > 0) // Publish updates
242 script_call("updated");
244 continue; // Renew was successful
246 odhcp6c_clear_state(STATE_SERVER_ID); // Remove binding
248 // If we have IAs, try rebind otherwise restart
249 res = dhcpv6_request(DHCPV6_MSG_REBIND);
251 odhcp6c_get_state(STATE_IA_PD, &ia_pd_new);
252 odhcp6c_get_state(STATE_IA_NA, &ia_na_new);
253 if (res < 0 || (ia_pd_new == 0 && ia_pd_len) ||
254 (ia_na_new == 0 && ia_na_len))
255 break; // We lost all our IAs, restart
257 script_call("rebound");
261 size_t ia_pd_len, ia_na_len, server_id_len;
262 odhcp6c_get_state(STATE_IA_PD, &ia_pd_len);
263 odhcp6c_get_state(STATE_IA_NA, &ia_na_len);
264 odhcp6c_get_state(STATE_SERVER_ID, &server_id_len);
266 // Add all prefixes to lost prefixes
268 script_call("unbound");
270 if (server_id_len > 0 && (ia_pd_len > 0 || ia_na_len > 0))
271 dhcpv6_request(DHCPV6_MSG_RELEASE);
273 odhcp6c_clear_state(STATE_IA_NA);
274 odhcp6c_clear_state(STATE_IA_PD);
277 script_call("stopped");
282 static int usage(void)
285 "Usage: odhcp6c [options] <interface>\n"
286 "\nFeature options:\n"
287 " -N <mode> Mode for requesting addresses [try|force|none]\n"
288 " -P <length> Request IPv6-Prefix (0 = auto)\n"
289 " -c <clientid> Override client-ID (base-16 encoded)\n"
290 " -r <options> Options to be requested (comma-separated)\n"
291 " -s <script> Status update script (/usr/sbin/odhcp6c-update)\n"
292 "\nInvocation options:\n"
293 " -p <pidfile> Set pidfile (/var/run/6relayd.pid)\n"
295 //" -v Increase logging verbosity\n"
296 " -h Show this help\n\n";
297 write(STDERR_FILENO, buf, sizeof(buf));
302 // Don't want to pull-in librt and libpthread just for a monotonic clock...
303 uint64_t odhcp6c_get_milli_time(void)
305 struct timespec t = {0, 0};
306 syscall(SYS_clock_gettime, CLOCK_MONOTONIC, &t);
307 return t.tv_sec * 1000 + t.tv_nsec / 1000000;
311 static uint8_t* odhcp6c_resize_state(enum odhcp6c_state state, ssize_t len)
314 return state_data[state] + state_len[state];
316 uint8_t *n = realloc(state_data[state], state_len[state] + len);
317 if (n || state_len[state] + len == 0) {
318 state_data[state] = n;
319 n += state_len[state];
320 state_len[state] += len;
326 bool odhcp6c_signal_process(void)
328 if (do_signal == SIGIO) {
330 bool updated = ra_process();
331 updated |= ra_rtnl_process();
332 if (updated && bound) {
334 script_call("ra-updated");
338 return do_signal != 0;
342 void odhcp6c_clear_state(enum odhcp6c_state state)
344 state_len[state] = 0;
348 void odhcp6c_add_state(enum odhcp6c_state state, const void *data, size_t len)
350 uint8_t *n = odhcp6c_resize_state(state, len);
352 memcpy(n, data, len);
356 size_t odhcp6c_remove_state(enum odhcp6c_state state, size_t offset, size_t len)
358 uint8_t *data = state_data[state];
359 ssize_t len_after = state_len[state] - (offset + len);
361 return state_len[state];
363 memmove(data + offset, data + offset + len, len_after);
364 return state_len[state] -= len;
368 void* odhcp6c_get_state(enum odhcp6c_state state, size_t *len)
370 *len = state_len[state];
371 return state_data[state];
375 struct odhcp6c_entry* odhcp6c_find_entry(enum odhcp6c_state state, const struct odhcp6c_entry *new)
377 size_t len, cmplen = offsetof(struct odhcp6c_entry, target) + new->length / 8;
378 struct odhcp6c_entry *start = odhcp6c_get_state(state, &len);
379 struct odhcp6c_entry *x = NULL;
381 for (struct odhcp6c_entry *c = start; !x && c < &start[len/sizeof(*c)]; ++c)
382 if (!memcmp(c, new, cmplen))
389 void odhcp6c_update_entry_safe(enum odhcp6c_state state, const struct odhcp6c_entry *new, uint32_t safe)
392 struct odhcp6c_entry *x = odhcp6c_find_entry(state, new);
393 struct odhcp6c_entry *start = odhcp6c_get_state(state, &len);
395 if (x && x->valid > new->valid && new->valid < safe)
398 if (new->valid > 0) {
402 odhcp6c_add_state(state, new, sizeof(*new));
404 odhcp6c_remove_state(state, (x - start) * sizeof(*x), sizeof(*x));
409 void odhcp6c_update_entry(enum odhcp6c_state state, const struct odhcp6c_entry *new)
411 odhcp6c_update_entry_safe(state, new, 0);
415 static void odhcp6c_expire_list(enum odhcp6c_state state, uint32_t elapsed)
418 struct odhcp6c_entry *start = odhcp6c_get_state(state, &len);
419 for (struct odhcp6c_entry *c = start; c < &start[len / sizeof(*c)]; ++c) {
420 if (c->preferred < elapsed)
422 else if (c->preferred != UINT32_MAX)
423 c->preferred -= elapsed;
425 if (c->valid < elapsed)
427 else if (c->valid != UINT32_MAX)
431 odhcp6c_remove_state(state, (c - start) * sizeof(*c), sizeof(*c));
436 void odhcp6c_expire(void)
438 static time_t last_update = 0;
439 time_t now = odhcp6c_get_milli_time() / 1000;
441 uint32_t elapsed = now - last_update;
444 odhcp6c_expire_list(STATE_RA_PREFIX, elapsed);
445 odhcp6c_expire_list(STATE_RA_ROUTE, elapsed);
446 odhcp6c_expire_list(STATE_IA_NA, elapsed);
447 odhcp6c_expire_list(STATE_IA_PD, elapsed);
451 void odhcp6c_random(void *buf, size_t len)
453 read(urandom_fd, buf, len);
457 static void sighandler(int signal)
459 if (signal == SIGCHLD)
460 while (waitpid(-1, NULL, WNOHANG) > 0);
461 else if (signal == SIGUSR1)
463 else if (signal == SIGUSR2)
465 else if (signal == SIGIO)