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.
29 #include <sys/syscall.h>
30 #include <arpa/inet.h>
37 static void sighandler(int signal
);
38 static int usage(void);
40 static uint8_t *state_data
[_STATE_MAX
] = {NULL
};
41 static size_t state_len
[_STATE_MAX
] = {0};
43 static volatile bool signal_io
= false;
44 static volatile bool signal_usr1
= false;
45 static volatile bool signal_usr2
= false;
46 static volatile bool signal_term
= false;
48 static int urandom_fd
= -1, allow_slaac_only
= 0;
49 static bool bound
= false, release
= true;
50 static time_t last_update
= 0;
52 static unsigned int min_update_interval
= DEFAULT_MIN_UPDATE_INTERVAL
;
54 int main(_unused
int argc
, char* const argv
[])
56 // Allocate ressources
57 const char *pidfile
= NULL
;
58 const char *script
= "/usr/sbin/odhcp6c-update";
64 enum odhcp6c_ia_mode ia_na_mode
= IA_MODE_TRY
;
65 enum odhcp6c_ia_mode ia_pd_mode
= IA_MODE_NONE
;
66 int ia_pd_iaid_index
= 0;
67 static struct in6_addr ifid
= IN6ADDR_ANY_INIT
;
68 int sol_timeout
= DHCPV6_SOL_MAX_RT
;
71 bool help
= false, daemonize
= false;
74 unsigned int client_options
= DHCPV6_CLIENT_FQDN
| DHCPV6_ACCEPT_RECONFIGURE
;
76 while ((c
= getopt(argc
, argv
, "S::N:V:P:FB:c:i:r:Ru:s:kt:m:hedp:fa")) != -1) {
79 allow_slaac_only
= (optarg
) ? atoi(optarg
) : -1;
83 if (!strcmp(optarg
, "force")) {
84 ia_na_mode
= IA_MODE_FORCE
;
85 allow_slaac_only
= -1;
86 } else if (!strcmp(optarg
, "none")) {
87 ia_na_mode
= IA_MODE_NONE
;
88 } else if (!strcmp(optarg
, "try")) {
89 ia_na_mode
= IA_MODE_TRY
;
96 l
= script_unhexlify(buf
, sizeof(buf
), optarg
);
100 odhcp6c_add_state(STATE_VENDORCLASS
, buf
, l
);
104 if (ia_pd_mode
== IA_MODE_NONE
)
105 ia_pd_mode
= IA_MODE_TRY
;
107 if (allow_slaac_only
>= 0 && allow_slaac_only
< 10)
108 allow_slaac_only
= 10;
113 int prefix_length
= strtoul(optarg
, &iaid_begin
, 10);
115 if (*iaid_begin
!= '\0' && *iaid_begin
!= ',' && *iaid_begin
!= ':') {
116 syslog(LOG_ERR
, "invalid argument: '%s'", optarg
);
120 struct odhcp6c_request_prefix prefix
= { 0, prefix_length
};
122 if (*iaid_begin
== ',' && (iaid_len
= strlen(iaid_begin
)) > 1)
123 memcpy(&prefix
.iaid
, iaid_begin
+ 1, iaid_len
> 4 ? 4 : iaid_len
);
124 else if (*iaid_begin
== ':')
125 prefix
.iaid
= htonl((uint32_t)strtoul(&iaid_begin
[1], NULL
, 16));
127 prefix
.iaid
= htonl(++ia_pd_iaid_index
);
129 odhcp6c_add_state(STATE_IA_PD_INIT
, &prefix
, sizeof(prefix
));
134 allow_slaac_only
= -1;
135 ia_pd_mode
= IA_MODE_FORCE
;
139 l
= script_unhexlify(&buf
[4], sizeof(buf
) - 4, optarg
);
142 buf
[1] = DHCPV6_OPT_CLIENTID
;
145 odhcp6c_add_state(STATE_CLIENT_ID
, buf
, l
+ 4);
152 if (inet_pton(AF_INET6
, optarg
, &ifid
) != 1)
159 opttype
= htons(strtoul(optarg
, &optpos
, 10));
160 if (optpos
== optarg
)
164 odhcp6c_add_state(STATE_ORO
, &opttype
, 2);
169 client_options
|= DHCPV6_STRICT_OPTIONS
;
173 optlen
= htons(strlen(optarg
));
174 odhcp6c_add_state(STATE_USERCLASS
, &optlen
, 2);
175 odhcp6c_add_state(STATE_USERCLASS
, optarg
, strlen(optarg
));
187 sol_timeout
= atoi(optarg
);
191 min_update_interval
= atoi(optarg
);
195 logopt
|= LOG_PERROR
;
207 client_options
&= ~DHCPV6_CLIENT_FQDN
;
211 client_options
&= ~DHCPV6_ACCEPT_RECONFIGURE
;
220 openlog("odhcp6c", logopt
, LOG_DAEMON
);
221 const char *ifname
= argv
[optind
];
226 signal(SIGIO
, sighandler
);
227 signal(SIGHUP
, sighandler
);
228 signal(SIGINT
, sighandler
);
229 signal(SIGCHLD
, sighandler
);
230 signal(SIGTERM
, sighandler
);
231 signal(SIGUSR1
, sighandler
);
232 signal(SIGUSR2
, sighandler
);
234 if ((urandom_fd
= open("/dev/urandom", O_CLOEXEC
| O_RDONLY
)) < 0 ||
235 init_dhcpv6(ifname
, client_options
, sol_timeout
) ||
236 ra_init(ifname
, &ifid
) || script_init(script
, ifname
)) {
237 syslog(LOG_ERR
, "failed to initialize: %s", strerror(errno
));
242 openlog("odhcp6c", LOG_PID
, LOG_DAEMON
); // Disable LOG_PERROR
244 syslog(LOG_ERR
, "Failed to daemonize: %s",
251 snprintf(pidbuf
, sizeof(pidbuf
),
252 "/var/run/odhcp6c.%s.pid", ifname
);
256 int fd
= open(pidfile
, O_WRONLY
| O_CREAT
, 0644);
259 int len
= snprintf(buf
, sizeof(buf
), "%i\n", getpid());
265 script_call("started");
267 while (!signal_term
) { // Main logic
268 odhcp6c_clear_state(STATE_SERVER_ID
);
269 odhcp6c_clear_state(STATE_SERVER_ADDR
);
270 odhcp6c_clear_state(STATE_IA_NA
);
271 odhcp6c_clear_state(STATE_IA_PD
);
272 odhcp6c_clear_state(STATE_SNTP_IP
);
273 odhcp6c_clear_state(STATE_NTP_IP
);
274 odhcp6c_clear_state(STATE_NTP_FQDN
);
275 odhcp6c_clear_state(STATE_SIP_IP
);
276 odhcp6c_clear_state(STATE_SIP_FQDN
);
277 dhcpv6_set_ia_mode(ia_na_mode
, ia_pd_mode
);
280 syslog(LOG_NOTICE
, "(re)starting transaction on %s", ifname
);
282 signal_usr1
= signal_usr2
= false;
283 int mode
= dhcpv6_request(DHCPV6_MSG_SOLICIT
);
284 odhcp6c_signal_process();
290 int res
= dhcpv6_request(mode
== DHCPV6_STATELESS
?
291 DHCPV6_MSG_INFO_REQ
: DHCPV6_MSG_REQUEST
);
292 bool signalled
= odhcp6c_signal_process();
296 else if (signalled
) {
301 mode
= dhcpv6_promote_server_cand();
302 } while (mode
> DHCPV6_UNKNOWN
);
308 case DHCPV6_STATELESS
:
310 syslog(LOG_NOTICE
, "entering stateless-mode on %s", ifname
);
312 while (!signal_usr2
&& !signal_term
) {
314 script_call("informed");
316 int res
= dhcpv6_poll_reconfigure();
317 odhcp6c_signal_process();
323 signal_usr1
= false; // Acknowledged
326 if (signal_usr2
|| signal_term
)
329 res
= dhcpv6_request(DHCPV6_MSG_INFO_REQ
);
330 odhcp6c_signal_process();
338 case DHCPV6_STATEFUL
:
340 script_call("bound");
341 syslog(LOG_NOTICE
, "entering stateful-mode on %s", ifname
);
343 while (!signal_usr2
&& !signal_term
) {
345 // Wait for T1 to expire or until we get a reconfigure
346 int res
= dhcpv6_poll_reconfigure();
347 odhcp6c_signal_process();
349 script_call("updated");
353 // Handle signal, if necessary
355 signal_usr1
= false; // Acknowledged
356 if (signal_usr2
|| signal_term
)
357 break; // Other signal type
359 // Send renew as T1 expired
360 res
= dhcpv6_request(DHCPV6_MSG_RENEW
);
361 odhcp6c_signal_process();
362 if (res
> 0) { // Renew was succesfull
364 script_call("updated");
365 continue; // Renew was successful
368 odhcp6c_clear_state(STATE_SERVER_ID
); // Remove binding
369 odhcp6c_clear_state(STATE_SERVER_ADDR
);
371 size_t ia_pd_len
, ia_na_len
;
372 odhcp6c_get_state(STATE_IA_PD
, &ia_pd_len
);
373 odhcp6c_get_state(STATE_IA_NA
, &ia_na_len
);
375 if (ia_pd_len
== 0 && ia_na_len
== 0)
378 // If we have IAs, try rebind otherwise restart
379 res
= dhcpv6_request(DHCPV6_MSG_REBIND
);
380 odhcp6c_signal_process();
383 script_call("rebound");
394 size_t ia_pd_len
, ia_na_len
, server_id_len
;
395 odhcp6c_get_state(STATE_IA_PD
, &ia_pd_len
);
396 odhcp6c_get_state(STATE_IA_NA
, &ia_na_len
);
397 odhcp6c_get_state(STATE_SERVER_ID
, &server_id_len
);
399 // Add all prefixes to lost prefixes
401 script_call("unbound");
403 if (server_id_len
> 0 && (ia_pd_len
> 0 || ia_na_len
> 0) && release
)
404 dhcpv6_request(DHCPV6_MSG_RELEASE
);
406 odhcp6c_clear_state(STATE_IA_NA
);
407 odhcp6c_clear_state(STATE_IA_PD
);
410 script_call("stopped");
415 static int usage(void)
418 "Usage: odhcp6c [options] <interface>\n"
419 "\nFeature options:\n"
420 " -S <time> Wait at least <time> sec for a DHCP-server (0)\n"
421 " -N <mode> Mode for requesting addresses [try|force|none]\n"
422 " -P <length> Request IPv6-Prefix (0 = auto)\n"
423 " -F Force IPv6-Prefix\n"
424 " -V <class> Set vendor-class option (base-16 encoded)\n"
425 " -u <user-class> Set user-class option string\n"
426 " -c <clientid> Override client-ID (base-16 encoded)\n"
427 " -i <iface-id> Use a custom interface identifier for RA handling\n"
428 " -r <options> Options to be requested (comma-separated)\n"
429 " -R Do not request any options except those specified with -r\n"
430 " -s <script> Status update script (/usr/sbin/odhcp6c-update)\n"
431 " -a Don't send Accept Reconfigure option\n"
432 " -f Don't send Client FQDN option\n"
433 " -k Don't send a RELEASE when stopping\n"
434 " -t <seconds> Maximum timeout for DHCPv6-SOLICIT (3600)\n"
435 " -m <seconds> Minimum time between accepting updates (30)\n"
436 "\nInvocation options:\n"
437 " -p <pidfile> Set pidfile (/var/run/odhcp6c.pid)\n"
439 " -e Write logmessages to stderr\n"
440 //" -v Increase logging verbosity\n"
441 " -h Show this help\n\n";
442 write(STDERR_FILENO
, buf
, sizeof(buf
));
447 // Don't want to pull-in librt and libpthread just for a monotonic clock...
448 uint64_t odhcp6c_get_milli_time(void)
450 struct timespec t
= {0, 0};
451 syscall(SYS_clock_gettime
, CLOCK_MONOTONIC
, &t
);
452 return ((uint64_t)t
.tv_sec
) * 1000 + ((uint64_t)t
.tv_nsec
) / 1000000;
456 static uint8_t* odhcp6c_resize_state(enum odhcp6c_state state
, ssize_t len
)
459 return state_data
[state
] + state_len
[state
];
460 else if (state_len
[state
] + len
> 1024)
463 uint8_t *n
= realloc(state_data
[state
], state_len
[state
] + len
);
464 if (n
|| state_len
[state
] + len
== 0) {
465 state_data
[state
] = n
;
466 n
+= state_len
[state
];
467 state_len
[state
] += len
;
473 bool odhcp6c_signal_process(void)
478 bool ra_updated
= ra_process();
483 if (ra_updated
&& (bound
|| allow_slaac_only
>= 0))
484 script_call("ra-updated"); // Immediate process urgent events
487 return signal_usr1
|| signal_usr2
|| signal_term
;
491 void odhcp6c_clear_state(enum odhcp6c_state state
)
493 state_len
[state
] = 0;
497 void odhcp6c_add_state(enum odhcp6c_state state
, const void *data
, size_t len
)
499 uint8_t *n
= odhcp6c_resize_state(state
, len
);
501 memcpy(n
, data
, len
);
504 void odhcp6c_insert_state(enum odhcp6c_state state
, size_t offset
, const void *data
, size_t len
)
506 ssize_t len_after
= state_len
[state
] - offset
;
510 uint8_t *n
= odhcp6c_resize_state(state
, len
);
512 uint8_t *sdata
= state_data
[state
];
514 memmove(sdata
+ offset
+ len
, sdata
+ offset
, len_after
);
515 memcpy(sdata
+ offset
, data
, len
);
519 size_t odhcp6c_remove_state(enum odhcp6c_state state
, size_t offset
, size_t len
)
521 uint8_t *data
= state_data
[state
];
522 ssize_t len_after
= state_len
[state
] - (offset
+ len
);
524 return state_len
[state
];
526 memmove(data
+ offset
, data
+ offset
+ len
, len_after
);
527 return state_len
[state
] -= len
;
531 void* odhcp6c_move_state(enum odhcp6c_state state
, size_t *len
)
533 *len
= state_len
[state
];
534 void *data
= state_data
[state
];
536 state_len
[state
] = 0;
537 state_data
[state
] = NULL
;
543 void* odhcp6c_get_state(enum odhcp6c_state state
, size_t *len
)
545 *len
= state_len
[state
];
546 return state_data
[state
];
550 struct odhcp6c_entry
* odhcp6c_find_entry(enum odhcp6c_state state
, const struct odhcp6c_entry
*new)
552 size_t len
, cmplen
= offsetof(struct odhcp6c_entry
, target
) + new->length
/ 8;
553 struct odhcp6c_entry
*start
= odhcp6c_get_state(state
, &len
);
554 struct odhcp6c_entry
*x
= NULL
;
556 for (struct odhcp6c_entry
*c
= start
; !x
&& c
< &start
[len
/sizeof(*c
)]; ++c
)
557 if (!memcmp(c
, new, cmplen
))
564 bool odhcp6c_update_entry_safe(enum odhcp6c_state state
, struct odhcp6c_entry
*new, uint32_t safe
)
567 struct odhcp6c_entry
*x
= odhcp6c_find_entry(state
, new);
568 struct odhcp6c_entry
*start
= odhcp6c_get_state(state
, &len
);
570 if (x
&& x
->valid
> new->valid
&& new->valid
< safe
)
573 if (new->valid
> 0) {
575 if (new->valid
>= x
->valid
&& new->valid
!= UINT32_MAX
&&
576 new->valid
- x
->valid
< min_update_interval
&&
577 new->preferred
>= x
->preferred
&&
578 new->preferred
!= UINT32_MAX
&&
579 new->preferred
- x
->preferred
< min_update_interval
&&
580 x
->class == new->class)
582 x
->valid
= new->valid
;
583 x
->preferred
= new->preferred
;
586 x
->class = new->class;
589 odhcp6c_add_state(state
, new, sizeof(*new));
592 odhcp6c_remove_state(state
, (x
- start
) * sizeof(*x
), sizeof(*x
));
598 bool odhcp6c_update_entry(enum odhcp6c_state state
, struct odhcp6c_entry
*new)
600 return odhcp6c_update_entry_safe(state
, new, 0);
604 static void odhcp6c_expire_list(enum odhcp6c_state state
, uint32_t elapsed
)
607 struct odhcp6c_entry
*start
= odhcp6c_get_state(state
, &len
);
608 for (struct odhcp6c_entry
*c
= start
; c
< &start
[len
/ sizeof(*c
)]; ++c
) {
611 else if (c
->t1
!= UINT32_MAX
)
616 else if (c
->t2
!= UINT32_MAX
)
619 if (c
->preferred
< elapsed
)
621 else if (c
->preferred
!= UINT32_MAX
)
622 c
->preferred
-= elapsed
;
624 if (c
->valid
< elapsed
)
626 else if (c
->valid
!= UINT32_MAX
)
630 odhcp6c_remove_state(state
, (c
- start
) * sizeof(*c
), sizeof(*c
));
635 void odhcp6c_expire(void)
637 time_t now
= odhcp6c_get_milli_time() / 1000;
638 uint32_t elapsed
= (last_update
> 0) ? now
- last_update
: 0;
641 odhcp6c_expire_list(STATE_RA_PREFIX
, elapsed
);
642 odhcp6c_expire_list(STATE_RA_ROUTE
, elapsed
);
643 odhcp6c_expire_list(STATE_RA_DNS
, elapsed
);
644 odhcp6c_expire_list(STATE_IA_NA
, elapsed
);
645 odhcp6c_expire_list(STATE_IA_PD
, elapsed
);
649 uint32_t odhcp6c_elapsed(void)
651 return odhcp6c_get_milli_time() / 1000 - last_update
;
655 void odhcp6c_random(void *buf
, size_t len
)
657 read(urandom_fd
, buf
, len
);
660 bool odhcp6c_is_bound(void)
665 static void sighandler(int signal
)
667 if (signal
== SIGCHLD
)
668 while (waitpid(-1, NULL
, WNOHANG
) > 0);
669 else if (signal
== SIGUSR1
)
671 else if (signal
== SIGUSR2
)
673 else if (signal
== SIGIO
)