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 int do_signal = 0;
47 static int urandom_fd = -1, allow_slaac_only = 0;
48 static bool bound = false, release = true;
49 static time_t last_update = 0;
52 int main(_unused int argc, char* const argv[])
54 // Allocate ressources
55 const char *pidfile = NULL;
56 const char *script = "/usr/sbin/odhcp6c-update";
61 enum odhcp6c_ia_mode ia_na_mode = IA_MODE_TRY;
62 enum odhcp6c_ia_mode ia_pd_mode = IA_MODE_TRY;
63 static struct in6_addr ifid = IN6ADDR_ANY_INIT;
64 int sol_timeout = DHCPV6_SOL_MAX_RT;
67 int bfd_interval = 0, bfd_loss = 3;
70 bool help = false, daemonize = false;
72 int c, request_pd = 0;
73 while ((c = getopt(argc, argv, "S::N:P:FB:c:i:r:s:kt:hedp:")) != -1) {
76 allow_slaac_only = (optarg) ? atoi(optarg) : -1;
80 if (!strcmp(optarg, "force")) {
81 ia_na_mode = IA_MODE_FORCE;
82 allow_slaac_only = -1;
83 } else if (!strcmp(optarg, "none")) {
84 ia_na_mode = IA_MODE_NONE;
85 } else if (!strcmp(optarg, "try")) {
86 ia_na_mode = IA_MODE_TRY;
93 if (allow_slaac_only >= 0 && allow_slaac_only < 10)
94 allow_slaac_only = 10;
96 request_pd = strtoul(optarg, NULL, 10);
103 allow_slaac_only = -1;
104 ia_pd_mode = IA_MODE_FORCE;
109 bfd_interval = atoi(optarg);
114 l = script_unhexlify(&buf[4], sizeof(buf) - 4, optarg);
117 buf[1] = DHCPV6_OPT_CLIENTID;
120 odhcp6c_add_state(STATE_CLIENT_ID, buf, l + 4);
127 if (inet_pton(AF_INET6, optarg, &ifid) != 1)
134 opttype = htons(strtoul(optarg, &optpos, 10));
135 if (optpos == optarg)
139 odhcp6c_add_state(STATE_ORO, &opttype, 2);
152 sol_timeout = atoi(optarg);
156 logopt |= LOG_PERROR;
173 openlog("odhcp6c", logopt, LOG_DAEMON);
174 const char *ifname = argv[optind];
179 signal(SIGIO, sighandler);
180 signal(SIGHUP, sighandler);
181 signal(SIGINT, sighandler);
182 signal(SIGCHLD, sighandler);
183 signal(SIGTERM, sighandler);
184 signal(SIGUSR1, sighandler);
185 signal(SIGUSR2, sighandler);
187 if ((urandom_fd = open("/dev/urandom", O_CLOEXEC | O_RDONLY)) < 0 ||
188 init_dhcpv6(ifname, request_pd, sol_timeout) ||
189 ra_init(ifname, &ifid) || script_init(script, ifname)) {
190 syslog(LOG_ERR, "failed to initialize: %s", strerror(errno));
195 openlog("odhcp6c", LOG_PID, LOG_DAEMON); // Disable LOG_PERROR
197 syslog(LOG_ERR, "Failed to daemonize: %s",
204 snprintf(pidbuf, sizeof(pidbuf),
205 "/var/run/odhcp6c.%s.pid", ifname);
209 int fd = open(pidfile, O_WRONLY | O_CREAT);
212 int len = snprintf(buf, sizeof(buf), "%i\n", getpid());
218 script_call("started");
220 while (do_signal != SIGTERM) { // Main logic
221 odhcp6c_clear_state(STATE_SERVER_ID);
222 odhcp6c_clear_state(STATE_IA_NA);
223 odhcp6c_clear_state(STATE_IA_PD);
224 odhcp6c_clear_state(STATE_SNTP_IP);
225 odhcp6c_clear_state(STATE_SNTP_FQDN);
226 odhcp6c_clear_state(STATE_SIP_IP);
227 odhcp6c_clear_state(STATE_SIP_FQDN);
228 dhcpv6_set_ia_mode(ia_na_mode, ia_pd_mode);
231 syslog(LOG_NOTICE, "(re)starting transaction on %s", ifname);
234 int mode = dhcpv6_request(DHCPV6_MSG_SOLICIT);
235 odhcp6c_signal_process();
241 int res = dhcpv6_request(mode == DHCPV6_STATELESS ?
242 DHCPV6_MSG_INFO_REQ : DHCPV6_MSG_REQUEST);
244 odhcp6c_signal_process();
247 else if (do_signal > 0) {
252 mode = dhcpv6_promote_server_cand();
253 } while (mode > DHCPV6_UNKNOWN);
259 case DHCPV6_STATELESS:
261 syslog(LOG_NOTICE, "entering stateless-mode on %s", ifname);
263 while (do_signal == 0 || do_signal == SIGUSR1) {
265 script_call("informed");
267 int res = dhcpv6_poll_reconfigure();
268 odhcp6c_signal_process();
273 if (do_signal == SIGUSR1) {
274 do_signal = 0; // Acknowledged
276 } else if (do_signal > 0)
279 res = dhcpv6_request(DHCPV6_MSG_INFO_REQ);
280 odhcp6c_signal_process();
281 if (do_signal == SIGUSR1)
288 case DHCPV6_STATEFUL:
289 script_call("bound");
291 syslog(LOG_NOTICE, "entering stateful-mode on %s", ifname);
293 if (bfd_interval > 0)
294 bfd_start(ifname, bfd_loss, bfd_interval);
297 while (do_signal == 0 || do_signal == SIGUSR1) {
299 // Wait for T1 to expire or until we get a reconfigure
300 int res = dhcpv6_poll_reconfigure();
301 odhcp6c_signal_process();
303 script_call("updated");
307 // Handle signal, if necessary
308 if (do_signal == SIGUSR1)
309 do_signal = 0; // Acknowledged
310 else if (do_signal > 0)
311 break; // Other signal type
313 // Send renew as T1 expired
314 res = dhcpv6_request(DHCPV6_MSG_RENEW);
315 odhcp6c_signal_process();
316 if (res > 0) { // Renew was succesfull
318 script_call("updated");
319 continue; // Renew was successful
322 odhcp6c_clear_state(STATE_SERVER_ID); // Remove binding
324 // If we have IAs, try rebind otherwise restart
325 res = dhcpv6_request(DHCPV6_MSG_REBIND);
326 odhcp6c_signal_process();
329 script_call("rebound");
343 size_t ia_pd_len, ia_na_len, server_id_len;
344 odhcp6c_get_state(STATE_IA_PD, &ia_pd_len);
345 odhcp6c_get_state(STATE_IA_NA, &ia_na_len);
346 odhcp6c_get_state(STATE_SERVER_ID, &server_id_len);
348 // Add all prefixes to lost prefixes
350 script_call("unbound");
352 if (server_id_len > 0 && (ia_pd_len > 0 || ia_na_len > 0) && release)
353 dhcpv6_request(DHCPV6_MSG_RELEASE);
355 odhcp6c_clear_state(STATE_IA_NA);
356 odhcp6c_clear_state(STATE_IA_PD);
359 script_call("stopped");
364 static int usage(void)
367 "Usage: odhcp6c [options] <interface>\n"
368 "\nFeature options:\n"
369 " -S <time> Wait at least <time> sec for a DHCP-server (0)\n"
370 " -N <mode> Mode for requesting addresses [try|force|none]\n"
371 " -P <length> Request IPv6-Prefix (0 = auto)\n"
372 " -F Force IPv6-Prefix\n"
374 " -B <interval> Enable BFD ping check\n"
376 " -c <clientid> Override client-ID (base-16 encoded)\n"
377 " -i <iface-id> Use a custom interface identifier for RA handling\n"
378 " -r <options> Options to be requested (comma-separated)\n"
379 " -s <script> Status update script (/usr/sbin/odhcp6c-update)\n"
380 " -k Don't send a RELEASE when stopping\n"
381 " -t <seconds> Maximum timeout for DHCPv6-SOLICIT (120)\n"
382 "\nInvocation options:\n"
383 " -p <pidfile> Set pidfile (/var/run/6relayd.pid)\n"
385 " -e Write logmessages to stderr\n"
386 //" -v Increase logging verbosity\n"
387 " -h Show this help\n\n";
388 write(STDERR_FILENO, buf, sizeof(buf));
393 // Don't want to pull-in librt and libpthread just for a monotonic clock...
394 uint64_t odhcp6c_get_milli_time(void)
396 struct timespec t = {0, 0};
397 syscall(SYS_clock_gettime, CLOCK_MONOTONIC, &t);
398 return t.tv_sec * 1000 + t.tv_nsec / 1000000;
402 static uint8_t* odhcp6c_resize_state(enum odhcp6c_state state, ssize_t len)
405 return state_data[state] + state_len[state];
406 else if (state_len[state] + len > 1024)
409 uint8_t *n = realloc(state_data[state], state_len[state] + len);
410 if (n || state_len[state] + len == 0) {
411 state_data[state] = n;
412 n += state_len[state];
413 state_len[state] += len;
419 bool odhcp6c_signal_process(void)
421 if (do_signal == SIGIO) {
423 bool ra_updated = ra_process();
428 if (ra_updated && (bound || allow_slaac_only == 0))
429 script_call("ra-updated"); // Immediate process urgent events
430 else if (ra_updated && !bound && allow_slaac_only > 0)
431 script_delay_call("ra-updated", allow_slaac_only);
438 return do_signal != 0;
442 void odhcp6c_clear_state(enum odhcp6c_state state)
444 state_len[state] = 0;
448 void odhcp6c_add_state(enum odhcp6c_state state, const void *data, size_t len)
450 uint8_t *n = odhcp6c_resize_state(state, len);
452 memcpy(n, data, len);
455 void odhcp6c_insert_state(enum odhcp6c_state state, size_t offset, const void *data, size_t len)
457 ssize_t len_after = state_len[state] - offset;
461 uint8_t *n = odhcp6c_resize_state(state, len);
463 uint8_t *sdata = state_data[state];
465 memmove(sdata + offset + len, sdata + offset, len_after);
466 memcpy(sdata + offset, data, len);
470 size_t odhcp6c_remove_state(enum odhcp6c_state state, size_t offset, size_t len)
472 uint8_t *data = state_data[state];
473 ssize_t len_after = state_len[state] - (offset + len);
475 return state_len[state];
477 memmove(data + offset, data + offset + len, len_after);
478 return state_len[state] -= len;
482 void* odhcp6c_move_state(enum odhcp6c_state state, size_t *len)
484 *len = state_len[state];
485 void *data = state_data[state];
487 state_len[state] = 0;
488 state_data[state] = NULL;
494 void* odhcp6c_get_state(enum odhcp6c_state state, size_t *len)
496 *len = state_len[state];
497 return state_data[state];
501 struct odhcp6c_entry* odhcp6c_find_entry(enum odhcp6c_state state, const struct odhcp6c_entry *new)
503 size_t len, cmplen = offsetof(struct odhcp6c_entry, target) + new->length / 8;
504 struct odhcp6c_entry *start = odhcp6c_get_state(state, &len);
505 struct odhcp6c_entry *x = NULL;
507 for (struct odhcp6c_entry *c = start; !x && c < &start[len/sizeof(*c)]; ++c)
508 if (!memcmp(c, new, cmplen))
515 bool odhcp6c_update_entry_safe(enum odhcp6c_state state, struct odhcp6c_entry *new, uint32_t safe)
518 struct odhcp6c_entry *x = odhcp6c_find_entry(state, new);
519 struct odhcp6c_entry *start = odhcp6c_get_state(state, &len);
521 if (x && x->valid > new->valid && new->valid < safe)
524 if (new->valid > 0) {
526 if (new->valid >= x->valid && new->valid - x->valid < 60 &&
527 new->preferred >= x->preferred &&
528 new->preferred - x->preferred < 60 &&
529 x->class == new->class)
531 x->valid = new->valid;
532 x->preferred = new->preferred;
535 x->class = new->class;
537 odhcp6c_add_state(state, new, sizeof(*new));
540 odhcp6c_remove_state(state, (x - start) * sizeof(*x), sizeof(*x));
546 bool odhcp6c_update_entry(enum odhcp6c_state state, struct odhcp6c_entry *new)
548 return odhcp6c_update_entry_safe(state, new, 0);
552 static void odhcp6c_expire_list(enum odhcp6c_state state, uint32_t elapsed)
555 struct odhcp6c_entry *start = odhcp6c_get_state(state, &len);
556 for (struct odhcp6c_entry *c = start; c < &start[len / sizeof(*c)]; ++c) {
559 else if (c->t1 != UINT32_MAX)
564 else if (c->t2 != UINT32_MAX)
567 if (c->preferred < elapsed)
569 else if (c->preferred != UINT32_MAX)
570 c->preferred -= elapsed;
572 if (c->valid < elapsed)
574 else if (c->valid != UINT32_MAX)
578 odhcp6c_remove_state(state, (c - start) * sizeof(*c), sizeof(*c));
583 void odhcp6c_expire(void)
585 time_t now = odhcp6c_get_milli_time() / 1000;
586 uint32_t elapsed = (last_update > 0) ? now - last_update : 0;
589 odhcp6c_expire_list(STATE_RA_PREFIX, elapsed);
590 odhcp6c_expire_list(STATE_RA_ROUTE, elapsed);
591 odhcp6c_expire_list(STATE_RA_DNS, elapsed);
592 odhcp6c_expire_list(STATE_IA_NA, elapsed);
593 odhcp6c_expire_list(STATE_IA_PD, elapsed);
597 uint32_t odhcp6c_elapsed(void)
599 return odhcp6c_get_milli_time() / 1000 - last_update;
603 void odhcp6c_random(void *buf, size_t len)
605 read(urandom_fd, buf, len);
608 bool odhcp6c_is_bound(void)
613 static void sighandler(int signal)
615 if (signal == SIGCHLD)
616 while (waitpid(-1, NULL, WNOHANG) > 0);
617 else if (signal == SIGUSR1)
619 else if (signal == SIGUSR2)
621 else if (signal == SIGIO)