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
= 0;
44 static bool bound
= false, release
= true;
45 static time_t last_update
= 0;
48 int main(_unused
int argc
, char* const argv
[])
50 // Allocate ressources
51 const char *pidfile
= NULL
;
52 const char *script
= "/usr/sbin/odhcp6c-update";
57 enum odhcp6c_ia_mode ia_na_mode
= IA_MODE_TRY
;
59 bool help
= false, daemonize
= false;
61 int c
, request_pd
= 0;
62 while ((c
= getopt(argc
, argv
, "S::N:P:c:r:s:khedp:")) != -1) {
65 allow_slaac_only
= (optarg
) ? atoi(optarg
) : -1;
69 if (!strcmp(optarg
, "force"))
70 ia_na_mode
= IA_MODE_FORCE
;
71 else if (!strcmp(optarg
, "none"))
72 ia_na_mode
= IA_MODE_NONE
;
73 else if (!strcmp(optarg
, "try"))
74 ia_na_mode
= IA_MODE_TRY
;
80 if (allow_slaac_only
>= 0 && allow_slaac_only
< 10)
81 allow_slaac_only
= 10;
83 request_pd
= strtoul(optarg
, NULL
, 10);
89 l
= script_unhexlify(&buf
[4], sizeof(buf
) - 4, optarg
);
92 buf
[1] = DHCPV6_OPT_CLIENTID
;
95 odhcp6c_add_state(STATE_CLIENT_ID
, buf
, l
+ 4);
104 opttype
= htons(strtoul(optarg
, &optpos
, 10));
105 if (optpos
== optarg
)
109 odhcp6c_add_state(STATE_ORO
, &opttype
, 2);
122 logopt
|= LOG_PERROR
;
139 openlog("odhcp6c", logopt
, LOG_DAEMON
);
140 const char *ifname
= argv
[optind
];
145 signal(SIGIO
, sighandler
);
146 signal(SIGHUP
, sighandler
);
147 signal(SIGINT
, sighandler
);
148 signal(SIGCHLD
, sighandler
);
149 signal(SIGTERM
, sighandler
);
150 signal(SIGUSR1
, sighandler
);
151 signal(SIGUSR2
, sighandler
);
153 if ((urandom_fd
= open("/dev/urandom", O_CLOEXEC
| O_RDONLY
)) < 0 ||
154 init_dhcpv6(ifname
, request_pd
) || ra_init(ifname
) ||
155 script_init(script
, ifname
)) {
156 syslog(LOG_ERR
, "failed to initialize: %s", strerror(errno
));
161 openlog("odhcp6c", LOG_PID
, LOG_DAEMON
); // Disable LOG_PERROR
163 syslog(LOG_ERR
, "Failed to daemonize: %s",
170 snprintf(pidbuf
, sizeof(pidbuf
),
171 "/var/run/odhcp6c.%s.pid", ifname
);
175 int fd
= open(pidfile
, O_WRONLY
| O_CREAT
);
178 int len
= snprintf(buf
, sizeof(buf
), "%i\n", getpid());
184 script_call("started");
186 while (do_signal
!= SIGTERM
) { // Main logic
187 odhcp6c_clear_state(STATE_SERVER_ID
);
188 odhcp6c_clear_state(STATE_SERVER_CAND
);
189 odhcp6c_clear_state(STATE_IA_PD
);
190 odhcp6c_clear_state(STATE_SNTP_IP
);
191 odhcp6c_clear_state(STATE_SNTP_FQDN
);
192 odhcp6c_clear_state(STATE_SIP_IP
);
193 odhcp6c_clear_state(STATE_SIP_FQDN
);
194 dhcpv6_set_ia_na_mode(ia_na_mode
);
197 syslog(LOG_NOTICE
, "(re)starting transaction on %s", ifname
);
200 int res
= dhcpv6_request(DHCPV6_MSG_SOLICIT
);
201 odhcp6c_signal_process();
204 continue; // Might happen if we got a signal
205 } else if (res
== DHCPV6_STATELESS
) { // Stateless mode
206 while (do_signal
== 0 || do_signal
== SIGUSR1
) {
209 res
= dhcpv6_request(DHCPV6_MSG_INFO_REQ
);
210 odhcp6c_signal_process();
211 if (do_signal
== SIGUSR1
)
216 script_call("informed");
219 syslog(LOG_NOTICE
, "entering stateless-mode on %s", ifname
);
221 if (dhcpv6_poll_reconfigure() > 0)
222 script_call("informed");
229 if (dhcpv6_request(DHCPV6_MSG_REQUEST
) < 0)
232 odhcp6c_signal_process();
233 script_call("bound");
235 syslog(LOG_NOTICE
, "entering stateful-mode on %s", ifname
);
237 while (do_signal
== 0 || do_signal
== SIGUSR1
) {
239 // Wait for T1 to expire or until we get a reconfigure
240 int res
= dhcpv6_poll_reconfigure();
241 odhcp6c_signal_process();
244 script_call("updated");
249 // Handle signal, if necessary
250 if (do_signal
== SIGUSR1
)
251 do_signal
= 0; // Acknowledged
252 else if (do_signal
> 0)
253 break; // Other signal type
255 size_t ia_pd_len
, ia_na_len
, ia_pd_new
, ia_na_new
;
256 odhcp6c_get_state(STATE_IA_PD
, &ia_pd_len
);
257 odhcp6c_get_state(STATE_IA_NA
, &ia_na_len
);
259 // If we have any IAs, send renew, otherwise request
261 if (ia_pd_len
== 0 && ia_na_len
== 0)
262 r
= dhcpv6_request(DHCPV6_MSG_REQUEST
);
264 r
= dhcpv6_request(DHCPV6_MSG_RENEW
);
265 odhcp6c_signal_process();
266 if (r
> 0) // Publish updates
267 script_call("updated");
269 continue; // Renew was successful
271 odhcp6c_clear_state(STATE_SERVER_ID
); // Remove binding
273 // If we have IAs, try rebind otherwise restart
274 res
= dhcpv6_request(DHCPV6_MSG_REBIND
);
275 odhcp6c_signal_process();
277 odhcp6c_get_state(STATE_IA_PD
, &ia_pd_new
);
278 odhcp6c_get_state(STATE_IA_NA
, &ia_na_new
);
279 if (res
< 0 || (ia_pd_new
== 0 && ia_pd_len
) ||
280 (ia_na_new
== 0 && ia_na_len
))
281 break; // We lost all our IAs, restart
283 script_call("rebound");
287 size_t ia_pd_len
, ia_na_len
, server_id_len
;
288 odhcp6c_get_state(STATE_IA_PD
, &ia_pd_len
);
289 odhcp6c_get_state(STATE_IA_NA
, &ia_na_len
);
290 odhcp6c_get_state(STATE_SERVER_ID
, &server_id_len
);
292 // Add all prefixes to lost prefixes
294 script_call("unbound");
296 if (server_id_len
> 0 && (ia_pd_len
> 0 || ia_na_len
> 0) && release
)
297 dhcpv6_request(DHCPV6_MSG_RELEASE
);
299 odhcp6c_clear_state(STATE_IA_NA
);
300 odhcp6c_clear_state(STATE_IA_PD
);
303 script_call("stopped");
308 static int usage(void)
311 "Usage: odhcp6c [options] <interface>\n"
312 "\nFeature options:\n"
313 " -S <time> Wait at least <time> sec for a DHCP-server (0)\n"
314 " -N <mode> Mode for requesting addresses [try|force|none]\n"
315 " -P <length> Request IPv6-Prefix (0 = auto)\n"
316 " -c <clientid> Override client-ID (base-16 encoded)\n"
317 " -r <options> Options to be requested (comma-separated)\n"
318 " -s <script> Status update script (/usr/sbin/odhcp6c-update)\n"
319 " -k Don't send a RELEASE when stopping\n"
320 "\nInvocation options:\n"
321 " -p <pidfile> Set pidfile (/var/run/6relayd.pid)\n"
323 " -e Write logmessages to stderr\n"
324 //" -v Increase logging verbosity\n"
325 " -h Show this help\n\n";
326 write(STDERR_FILENO
, buf
, sizeof(buf
));
331 // Don't want to pull-in librt and libpthread just for a monotonic clock...
332 uint64_t odhcp6c_get_milli_time(void)
334 struct timespec t
= {0, 0};
335 syscall(SYS_clock_gettime
, CLOCK_MONOTONIC
, &t
);
336 return t
.tv_sec
* 1000 + t
.tv_nsec
/ 1000000;
340 static uint8_t* odhcp6c_resize_state(enum odhcp6c_state state
, ssize_t len
)
343 return state_data
[state
] + state_len
[state
];
344 else if (state_len
[state
] + len
> 1024)
347 uint8_t *n
= realloc(state_data
[state
], state_len
[state
] + len
);
348 if (n
|| state_len
[state
] + len
== 0) {
349 state_data
[state
] = n
;
350 n
+= state_len
[state
];
351 state_len
[state
] += len
;
357 bool odhcp6c_signal_process(void)
359 if (do_signal
== SIGIO
) {
361 bool ra_rtnled
= ra_rtnl_process();
362 bool ra_updated
= ra_process();
364 if (ra_rtnled
|| (ra_updated
&& (bound
|| allow_slaac_only
== 0)))
365 script_call("ra-updated"); // Immediate process urgent events
366 else if (ra_updated
&& !bound
&& allow_slaac_only
> 0)
367 script_delay_call("ra-updated", allow_slaac_only
);
370 return do_signal
!= 0;
374 void odhcp6c_clear_state(enum odhcp6c_state state
)
376 state_len
[state
] = 0;
380 void odhcp6c_add_state(enum odhcp6c_state state
, const void *data
, size_t len
)
382 uint8_t *n
= odhcp6c_resize_state(state
, len
);
384 memcpy(n
, data
, len
);
388 size_t odhcp6c_remove_state(enum odhcp6c_state state
, size_t offset
, size_t len
)
390 uint8_t *data
= state_data
[state
];
391 ssize_t len_after
= state_len
[state
] - (offset
+ len
);
393 return state_len
[state
];
395 memmove(data
+ offset
, data
+ offset
+ len
, len_after
);
396 return state_len
[state
] -= len
;
400 void* odhcp6c_get_state(enum odhcp6c_state state
, size_t *len
)
402 *len
= state_len
[state
];
403 return state_data
[state
];
407 struct odhcp6c_entry
* odhcp6c_find_entry(enum odhcp6c_state state
, const struct odhcp6c_entry
*new)
409 size_t len
, cmplen
= offsetof(struct odhcp6c_entry
, target
) + new->length
/ 8;
410 struct odhcp6c_entry
*start
= odhcp6c_get_state(state
, &len
);
411 struct odhcp6c_entry
*x
= NULL
;
413 for (struct odhcp6c_entry
*c
= start
; !x
&& c
< &start
[len
/sizeof(*c
)]; ++c
)
414 if (!memcmp(c
, new, cmplen
))
421 void odhcp6c_update_entry_safe(enum odhcp6c_state state
, struct odhcp6c_entry
*new, uint32_t safe
)
424 struct odhcp6c_entry
*x
= odhcp6c_find_entry(state
, new);
425 struct odhcp6c_entry
*start
= odhcp6c_get_state(state
, &len
);
427 if (x
&& x
->valid
> new->valid
&& new->valid
< safe
)
430 if (new->valid
> 0) {
432 x
->valid
= new->valid
;
433 x
->preferred
= new->preferred
;
435 odhcp6c_add_state(state
, new, sizeof(*new));
438 odhcp6c_remove_state(state
, (x
- start
) * sizeof(*x
), sizeof(*x
));
443 void odhcp6c_update_entry(enum odhcp6c_state state
, struct odhcp6c_entry
*new)
445 odhcp6c_update_entry_safe(state
, new, 0);
449 static void odhcp6c_expire_list(enum odhcp6c_state state
, uint32_t elapsed
)
452 struct odhcp6c_entry
*start
= odhcp6c_get_state(state
, &len
);
453 for (struct odhcp6c_entry
*c
= start
; c
< &start
[len
/ sizeof(*c
)]; ++c
) {
454 if (c
->preferred
< elapsed
)
456 else if (c
->preferred
!= UINT32_MAX
)
457 c
->preferred
-= elapsed
;
459 if (c
->valid
< elapsed
)
461 else if (c
->valid
!= UINT32_MAX
)
465 odhcp6c_remove_state(state
, (c
- start
) * sizeof(*c
), sizeof(*c
));
470 void odhcp6c_expire(void)
472 time_t now
= odhcp6c_get_milli_time() / 1000;
473 uint32_t elapsed
= (last_update
> 0) ? now
- last_update
: 0;
476 odhcp6c_expire_list(STATE_RA_PREFIX
, elapsed
);
477 odhcp6c_expire_list(STATE_RA_ROUTE
, elapsed
);
478 odhcp6c_expire_list(STATE_RA_DNS
, elapsed
);
479 odhcp6c_expire_list(STATE_IA_NA
, elapsed
);
480 odhcp6c_expire_list(STATE_IA_PD
, elapsed
);
484 uint32_t odhcp6c_elapsed(void)
486 return odhcp6c_get_milli_time() / 1000 - last_update
;
490 void odhcp6c_random(void *buf
, size_t len
)
492 read(urandom_fd
, buf
, len
);
496 static void sighandler(int signal
)
498 if (signal
== SIGCHLD
)
499 while (waitpid(-1, NULL
, WNOHANG
) > 0);
500 else if (signal
== SIGUSR1
)
502 else if (signal
== SIGUSR2
)
504 else if (signal
== SIGIO
)