2 * Copyright (C) 2012-2014 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.
28 #include <sys/syscall.h>
29 #include <arpa/inet.h>
36 static void sighandler(int signal
);
37 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 bool signal_io
= false;
43 static volatile bool signal_usr1
= false;
44 static volatile bool signal_usr2
= false;
45 static volatile bool signal_term
= false;
47 static int urandom_fd
= -1, allow_slaac_only
= 0;
48 static bool bound
= false, release
= true, ra
= false;
49 static time_t last_update
= 0;
51 static unsigned int min_update_interval
= DEFAULT_MIN_UPDATE_INTERVAL
;
52 static unsigned int script_sync_delay
= 10;
53 static unsigned int script_accu_delay
= 1;
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";
65 enum odhcp6c_ia_mode ia_na_mode
= IA_MODE_TRY
;
66 enum odhcp6c_ia_mode ia_pd_mode
= IA_MODE_NONE
;
67 int ia_pd_iaid_index
= 0;
68 static struct in6_addr ifid
= IN6ADDR_ANY_INIT
;
69 int sol_timeout
= DHCPV6_SOL_MAX_RT
;
73 bool help
= false, daemonize
= false;
76 unsigned int client_options
= DHCPV6_CLIENT_FQDN
| DHCPV6_ACCEPT_RECONFIGURE
;
77 unsigned int ra_options
= RA_RDNSS_DEFAULT_LIFETIME
;
79 while ((c
= getopt(argc
, argv
, "S::N:V:P:FB:c:i:r:Ru:s:kt:m:Lhedp:fav")) != -1) {
82 allow_slaac_only
= (optarg
) ? atoi(optarg
) : -1;
86 if (!strcmp(optarg
, "force")) {
87 ia_na_mode
= IA_MODE_FORCE
;
88 allow_slaac_only
= -1;
89 } else if (!strcmp(optarg
, "none")) {
90 ia_na_mode
= IA_MODE_NONE
;
91 } else if (!strcmp(optarg
, "try")) {
92 ia_na_mode
= IA_MODE_TRY
;
99 l
= script_unhexlify(buf
, sizeof(buf
), optarg
);
103 odhcp6c_add_state(STATE_VENDORCLASS
, buf
, l
);
107 if (ia_pd_mode
== IA_MODE_NONE
)
108 ia_pd_mode
= IA_MODE_TRY
;
110 if (allow_slaac_only
>= 0 && allow_slaac_only
< 10)
111 allow_slaac_only
= 10;
116 int prefix_length
= strtoul(optarg
, &iaid_begin
, 10);
118 if (*iaid_begin
!= '\0' && *iaid_begin
!= ',' && *iaid_begin
!= ':') {
119 syslog(LOG_ERR
, "invalid argument: '%s'", optarg
);
123 struct odhcp6c_request_prefix prefix
= { 0, prefix_length
};
125 if (*iaid_begin
== ',' && (iaid_len
= strlen(iaid_begin
)) > 1)
126 memcpy(&prefix
.iaid
, iaid_begin
+ 1, iaid_len
> 4 ? 4 : iaid_len
);
127 else if (*iaid_begin
== ':')
128 prefix
.iaid
= htonl((uint32_t)strtoul(&iaid_begin
[1], NULL
, 16));
130 prefix
.iaid
= htonl(++ia_pd_iaid_index
);
132 odhcp6c_add_state(STATE_IA_PD_INIT
, &prefix
, sizeof(prefix
));
137 allow_slaac_only
= -1;
138 ia_pd_mode
= IA_MODE_FORCE
;
142 l
= script_unhexlify(&buf
[4], sizeof(buf
) - 4, optarg
);
145 buf
[1] = DHCPV6_OPT_CLIENTID
;
148 odhcp6c_add_state(STATE_CLIENT_ID
, buf
, l
+ 4);
155 if (inet_pton(AF_INET6
, optarg
, &ifid
) != 1)
162 opttype
= htons(strtoul(optarg
, &optpos
, 10));
163 if (optpos
== optarg
)
167 odhcp6c_add_state(STATE_ORO
, &opttype
, 2);
172 client_options
|= DHCPV6_STRICT_OPTIONS
;
176 optlen
= htons(strlen(optarg
));
177 odhcp6c_add_state(STATE_USERCLASS
, &optlen
, 2);
178 odhcp6c_add_state(STATE_USERCLASS
, optarg
, strlen(optarg
));
190 sol_timeout
= atoi(optarg
);
194 min_update_interval
= atoi(optarg
);
198 ra_options
&= ~RA_RDNSS_DEFAULT_LIFETIME
;
202 logopt
|= LOG_PERROR
;
214 client_options
&= ~DHCPV6_CLIENT_FQDN
;
218 client_options
&= ~DHCPV6_ACCEPT_RECONFIGURE
;
231 if (allow_slaac_only
> 0)
232 script_sync_delay
= allow_slaac_only
;
234 openlog("odhcp6c", logopt
, LOG_DAEMON
);
236 setlogmask(LOG_UPTO(LOG_WARNING
));
238 const char *ifname
= argv
[optind
];
243 signal(SIGIO
, sighandler
);
244 signal(SIGHUP
, sighandler
);
245 signal(SIGINT
, sighandler
);
246 signal(SIGTERM
, sighandler
);
247 signal(SIGUSR1
, sighandler
);
248 signal(SIGUSR2
, sighandler
);
250 if ((urandom_fd
= open("/dev/urandom", O_CLOEXEC
| O_RDONLY
)) < 0 ||
251 init_dhcpv6(ifname
, client_options
, sol_timeout
) ||
252 ra_init(ifname
, &ifid
, ra_options
) ||
253 script_init(script
, ifname
)) {
254 syslog(LOG_ERR
, "failed to initialize: %s", strerror(errno
));
259 openlog("odhcp6c", LOG_PID
, LOG_DAEMON
); // Disable LOG_PERROR
261 syslog(LOG_ERR
, "Failed to daemonize: %s",
267 snprintf((char*)buf
, sizeof(buf
), "/var/run/odhcp6c.%s.pid", ifname
);
268 pidfile
= (char*)buf
;
271 FILE *fp
= fopen(pidfile
, "w");
273 fprintf(fp
, "%i\n", getpid());
278 script_call("started", 0, false);
280 while (!signal_term
) { // Main logic
281 odhcp6c_clear_state(STATE_SERVER_ID
);
282 odhcp6c_clear_state(STATE_SERVER_ADDR
);
283 odhcp6c_clear_state(STATE_IA_NA
);
284 odhcp6c_clear_state(STATE_IA_PD
);
285 odhcp6c_clear_state(STATE_SNTP_IP
);
286 odhcp6c_clear_state(STATE_NTP_IP
);
287 odhcp6c_clear_state(STATE_NTP_FQDN
);
288 odhcp6c_clear_state(STATE_SIP_IP
);
289 odhcp6c_clear_state(STATE_SIP_FQDN
);
292 syslog(LOG_NOTICE
, "(re)starting transaction on %s", ifname
);
294 signal_usr1
= signal_usr2
= false;
295 int mode
= dhcpv6_set_ia_mode(ia_na_mode
, ia_pd_mode
);
296 if (mode
!= DHCPV6_STATELESS
)
297 mode
= dhcpv6_request(DHCPV6_MSG_SOLICIT
);
298 odhcp6c_signal_process();
304 int res
= dhcpv6_request(mode
== DHCPV6_STATELESS
?
305 DHCPV6_MSG_INFO_REQ
: DHCPV6_MSG_REQUEST
);
306 bool signalled
= odhcp6c_signal_process();
310 else if (signalled
) {
315 mode
= dhcpv6_promote_server_cand();
316 } while (mode
> DHCPV6_UNKNOWN
);
322 case DHCPV6_STATELESS
:
324 syslog(LOG_NOTICE
, "entering stateless-mode on %s", ifname
);
326 while (!signal_usr2
&& !signal_term
) {
328 script_call("informed", script_sync_delay
, true);
330 int res
= dhcpv6_poll_reconfigure();
331 odhcp6c_signal_process();
337 signal_usr1
= false; // Acknowledged
340 if (signal_usr2
|| signal_term
)
343 res
= dhcpv6_request(DHCPV6_MSG_INFO_REQ
);
344 odhcp6c_signal_process();
352 case DHCPV6_STATEFUL
:
354 script_call("bound", script_sync_delay
, true);
355 syslog(LOG_NOTICE
, "entering stateful-mode on %s", ifname
);
357 while (!signal_usr2
&& !signal_term
) {
359 // Wait for T1 to expire or until we get a reconfigure
360 int res
= dhcpv6_poll_reconfigure();
361 odhcp6c_signal_process();
363 script_call("updated", 0, false);
367 // Handle signal, if necessary
369 signal_usr1
= false; // Acknowledged
370 if (signal_usr2
|| signal_term
)
371 break; // Other signal type
373 // Send renew as T1 expired
374 res
= dhcpv6_request(DHCPV6_MSG_RENEW
);
375 odhcp6c_signal_process();
376 if (res
> 0) { // Renew was succesfull
378 script_call("updated", 0, false);
379 continue; // Renew was successful
382 odhcp6c_clear_state(STATE_SERVER_ID
); // Remove binding
383 odhcp6c_clear_state(STATE_SERVER_ADDR
);
385 size_t ia_pd_len
, ia_na_len
;
386 odhcp6c_get_state(STATE_IA_PD
, &ia_pd_len
);
387 odhcp6c_get_state(STATE_IA_NA
, &ia_na_len
);
389 if (ia_pd_len
== 0 && ia_na_len
== 0)
392 // If we have IAs, try rebind otherwise restart
393 res
= dhcpv6_request(DHCPV6_MSG_REBIND
);
394 odhcp6c_signal_process();
397 script_call("rebound", 0, true);
410 size_t ia_pd_len
, ia_na_len
, server_id_len
;
411 odhcp6c_get_state(STATE_IA_PD
, &ia_pd_len
);
412 odhcp6c_get_state(STATE_IA_NA
, &ia_na_len
);
413 odhcp6c_get_state(STATE_SERVER_ID
, &server_id_len
);
415 // Add all prefixes to lost prefixes
417 script_call("unbound", 0, true);
419 if (server_id_len
> 0 && (ia_pd_len
> 0 || ia_na_len
> 0) && release
)
420 dhcpv6_request(DHCPV6_MSG_RELEASE
);
422 odhcp6c_clear_state(STATE_IA_NA
);
423 odhcp6c_clear_state(STATE_IA_PD
);
426 script_call("stopped", 0, true);
431 static int usage(void)
434 "Usage: odhcp6c [options] <interface>\n"
435 "\nFeature options:\n"
436 " -S <time> Wait at least <time> sec for a DHCP-server (0)\n"
437 " -N <mode> Mode for requesting addresses [try|force|none]\n"
438 " -P <length> Request IPv6-Prefix (0 = auto)\n"
439 " -F Force IPv6-Prefix\n"
440 " -V <class> Set vendor-class option (base-16 encoded)\n"
441 " -u <user-class> Set user-class option string\n"
442 " -c <clientid> Override client-ID (base-16 encoded 16-bit type + value)\n"
443 " -i <iface-id> Use a custom interface identifier for RA handling\n"
444 " -r <options> Options to be requested (comma-separated)\n"
445 " -R Do not request any options except those specified with -r\n"
446 " -s <script> Status update script (/usr/sbin/odhcp6c-update)\n"
447 " -a Don't send Accept Reconfigure option\n"
448 " -f Don't send Client FQDN option\n"
449 " -k Don't send a RELEASE when stopping\n"
450 " -t <seconds> Maximum timeout for DHCPv6-SOLICIT (120)\n"
451 " -m <seconds> Minimum time between accepting updates (30)\n"
452 " -L Ignore default lifetime for RDNSS records\n"
453 "\nInvocation options:\n"
454 " -p <pidfile> Set pidfile (/var/run/odhcp6c.pid)\n"
456 " -e Write logmessages to stderr\n"
457 " -v Increase logging verbosity\n"
458 " -h Show this help\n\n";
464 // Don't want to pull-in librt and libpthread just for a monotonic clock...
465 uint64_t odhcp6c_get_milli_time(void)
467 struct timespec t
= {0, 0};
468 syscall(SYS_clock_gettime
, CLOCK_MONOTONIC
, &t
);
469 return ((uint64_t)t
.tv_sec
) * 1000 + ((uint64_t)t
.tv_nsec
) / 1000000;
473 static uint8_t* odhcp6c_resize_state(enum odhcp6c_state state
, ssize_t len
)
476 return state_data
[state
] + state_len
[state
];
477 else if (state_len
[state
] + len
> 1024)
480 uint8_t *n
= realloc(state_data
[state
], state_len
[state
] + len
);
481 if (n
|| state_len
[state
] + len
== 0) {
482 state_data
[state
] = n
;
483 n
+= state_len
[state
];
484 state_len
[state
] += len
;
490 bool odhcp6c_signal_process(void)
495 bool ra_updated
= ra_process();
502 if (ra_updated
&& (bound
|| allow_slaac_only
>= 0)) {
503 script_call("ra-updated", (!ra
&& !bound
) ?
504 script_sync_delay
: script_accu_delay
, false);
509 return signal_usr1
|| signal_usr2
|| signal_term
;
513 void odhcp6c_clear_state(enum odhcp6c_state state
)
515 state_len
[state
] = 0;
519 void odhcp6c_add_state(enum odhcp6c_state state
, const void *data
, size_t len
)
521 uint8_t *n
= odhcp6c_resize_state(state
, len
);
523 memcpy(n
, data
, len
);
526 int odhcp6c_insert_state(enum odhcp6c_state state
, size_t offset
, const void *data
, size_t len
)
528 ssize_t len_after
= state_len
[state
] - offset
;
532 uint8_t *n
= odhcp6c_resize_state(state
, len
);
534 uint8_t *sdata
= state_data
[state
];
536 memmove(sdata
+ offset
+ len
, sdata
+ offset
, len_after
);
537 memcpy(sdata
+ offset
, data
, len
);
543 size_t odhcp6c_remove_state(enum odhcp6c_state state
, size_t offset
, size_t len
)
545 uint8_t *data
= state_data
[state
];
546 ssize_t len_after
= state_len
[state
] - (offset
+ len
);
548 return state_len
[state
];
550 memmove(data
+ offset
, data
+ offset
+ len
, len_after
);
551 return state_len
[state
] -= len
;
555 void* odhcp6c_move_state(enum odhcp6c_state state
, size_t *len
)
557 *len
= state_len
[state
];
558 void *data
= state_data
[state
];
560 state_len
[state
] = 0;
561 state_data
[state
] = NULL
;
567 void* odhcp6c_get_state(enum odhcp6c_state state
, size_t *len
)
569 *len
= state_len
[state
];
570 return state_data
[state
];
574 static struct odhcp6c_entry
* odhcp6c_find_entry(enum odhcp6c_state state
, const struct odhcp6c_entry
*new)
576 size_t len
, cmplen
= offsetof(struct odhcp6c_entry
, target
) + ((new->length
+ 7) / 8);
577 uint8_t *start
= odhcp6c_get_state(state
, &len
);
579 for (struct odhcp6c_entry
*c
= (struct odhcp6c_entry
*)start
;
580 (uint8_t*)c
< &start
[len
] &&
581 (uint8_t*)odhcp6c_next_entry(c
) <= &start
[len
];
582 c
= odhcp6c_next_entry(c
))
583 if (!memcmp(c
, new, cmplen
) && !memcmp(c
->auxtarget
, new->auxtarget
, new->auxlen
))
590 bool odhcp6c_update_entry(enum odhcp6c_state state
, struct odhcp6c_entry
*new,
591 uint32_t safe
, bool filterexcess
)
594 struct odhcp6c_entry
*x
= odhcp6c_find_entry(state
, new);
595 uint8_t *start
= odhcp6c_get_state(state
, &len
);
597 if (x
&& x
->valid
> new->valid
&& new->valid
< safe
)
600 if (new->valid
> 0) {
602 if (filterexcess
&& new->valid
>= x
->valid
&&
603 new->valid
!= UINT32_MAX
&&
604 new->valid
- x
->valid
< min_update_interval
&&
605 new->preferred
>= x
->preferred
&&
606 new->preferred
!= UINT32_MAX
&&
607 new->preferred
- x
->preferred
< min_update_interval
)
609 x
->valid
= new->valid
;
610 x
->preferred
= new->preferred
;
615 odhcp6c_add_state(state
, new, odhcp6c_entry_size(new));
618 odhcp6c_remove_state(state
, ((uint8_t*)x
) - start
, odhcp6c_entry_size(x
));
624 static void odhcp6c_expire_list(enum odhcp6c_state state
, uint32_t elapsed
)
627 uint8_t *start
= odhcp6c_get_state(state
, &len
);
628 for (struct odhcp6c_entry
*c
= (struct odhcp6c_entry
*)start
;
629 (uint8_t*)c
< &start
[len
] &&
630 (uint8_t*)odhcp6c_next_entry(c
) <= &start
[len
];
634 else if (c
->t1
!= UINT32_MAX
)
639 else if (c
->t2
!= UINT32_MAX
)
642 if (c
->preferred
< elapsed
)
644 else if (c
->preferred
!= UINT32_MAX
)
645 c
->preferred
-= elapsed
;
647 if (c
->valid
< elapsed
)
649 else if (c
->valid
!= UINT32_MAX
)
653 odhcp6c_remove_state(state
, ((uint8_t*)c
) - start
, odhcp6c_entry_size(c
));
654 start
= odhcp6c_get_state(state
, &len
);
656 c
= odhcp6c_next_entry(c
);
662 void odhcp6c_expire(void)
664 time_t now
= odhcp6c_get_milli_time() / 1000;
665 uint32_t elapsed
= (last_update
> 0) ? now
- last_update
: 0;
668 odhcp6c_expire_list(STATE_RA_PREFIX
, elapsed
);
669 odhcp6c_expire_list(STATE_RA_ROUTE
, elapsed
);
670 odhcp6c_expire_list(STATE_RA_DNS
, elapsed
);
671 odhcp6c_expire_list(STATE_RA_SEARCH
, elapsed
);
672 odhcp6c_expire_list(STATE_IA_NA
, elapsed
);
673 odhcp6c_expire_list(STATE_IA_PD
, elapsed
);
677 uint32_t odhcp6c_elapsed(void)
679 return odhcp6c_get_milli_time() / 1000 - last_update
;
683 int odhcp6c_random(void *buf
, size_t len
)
685 return read(urandom_fd
, buf
, len
);
688 bool odhcp6c_is_bound(void)
693 static void sighandler(int signal
)
695 if (signal
== SIGUSR1
)
697 else if (signal
== SIGUSR2
)
699 else if (signal
== SIGIO
)