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, allow_slaac_only
= true, release
= true;
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
, "SN:P:c:r:s:khdp:")) != -1) {
65 allow_slaac_only
= false;
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 allow_slaac_only
= false;
81 request_pd
= strtoul(optarg
, NULL
, 10);
87 l
= script_unhexlify(&buf
[4], sizeof(buf
) - 4, optarg
);
90 buf
[1] = DHCPV6_OPT_CLIENTID
;
93 odhcp6c_add_state(STATE_CLIENT_ID
, buf
, l
+ 4);
102 opttype
= htons(strtoul(optarg
, &optpos
, 10));
103 if (optpos
== optarg
)
107 odhcp6c_add_state(STATE_ORO
, &opttype
, 2);
133 const char *ifname
= argv
[optind
];
138 if ((urandom_fd
= open("/dev/urandom", O_CLOEXEC
| O_RDONLY
)) < 0 ||
139 init_dhcpv6(ifname
, request_pd
) || ra_init(ifname
) ||
140 script_init(script
, ifname
)) {
141 syslog(LOG_ERR
, "failed to initialize: %s", strerror(errno
));
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
);
154 openlog("odhcp6c", LOG_PID
, LOG_DAEMON
); // Disable LOG_PERROR
156 syslog(LOG_ERR
, "Failed to daemonize: %s",
163 snprintf(pidbuf
, sizeof(pidbuf
),
164 "/var/run/odhcp6c.%s.pid", ifname
);
168 int fd
= open(pidfile
, O_WRONLY
| O_CREAT
);
171 int len
= snprintf(buf
, sizeof(buf
), "%i\n", getpid());
177 script_call("started");
179 while (do_signal
!= SIGTERM
) { // Main logic
180 odhcp6c_clear_state(STATE_SERVER_ID
);
181 odhcp6c_clear_state(STATE_SERVER_CAND
);
182 odhcp6c_clear_state(STATE_IA_PD
);
183 odhcp6c_clear_state(STATE_SNTP_IP
);
184 odhcp6c_clear_state(STATE_SNTP_FQDN
);
185 odhcp6c_clear_state(STATE_SIP_IP
);
186 odhcp6c_clear_state(STATE_SIP_FQDN
);
187 dhcpv6_set_ia_na_mode(ia_na_mode
);
190 syslog(LOG_NOTICE
, "(re)starting transaction on %s", ifname
);
193 int res
= dhcpv6_request(DHCPV6_MSG_SOLICIT
);
194 odhcp6c_signal_process();
197 continue; // Might happen if we got a signal
198 } else if (res
== DHCPV6_STATELESS
) { // Stateless mode
199 while (do_signal
== 0 || do_signal
== SIGUSR1
) {
202 res
= dhcpv6_request(DHCPV6_MSG_INFO_REQ
);
203 odhcp6c_signal_process();
204 if (do_signal
== SIGUSR1
)
209 script_call("informed");
212 syslog(LOG_NOTICE
, "entering stateless-mode on %s", ifname
);
214 if (dhcpv6_poll_reconfigure() > 0)
215 script_call("informed");
222 if (dhcpv6_request(DHCPV6_MSG_REQUEST
) < 0)
225 odhcp6c_signal_process();
226 script_call("bound");
228 syslog(LOG_NOTICE
, "entering stateful-mode on %s", ifname
);
230 while (do_signal
== 0 || do_signal
== SIGUSR1
) {
232 // Wait for T1 to expire or until we get a reconfigure
233 int res
= dhcpv6_poll_reconfigure();
234 odhcp6c_signal_process();
237 script_call("updated");
242 // Handle signal, if necessary
243 if (do_signal
== SIGUSR1
)
244 do_signal
= 0; // Acknowledged
245 else if (do_signal
> 0)
246 break; // Other signal type
248 size_t ia_pd_len
, ia_na_len
, ia_pd_new
, ia_na_new
;
249 odhcp6c_get_state(STATE_IA_PD
, &ia_pd_len
);
250 odhcp6c_get_state(STATE_IA_NA
, &ia_na_len
);
252 // If we have any IAs, send renew, otherwise request
254 if (ia_pd_len
== 0 && ia_na_len
== 0)
255 r
= dhcpv6_request(DHCPV6_MSG_REQUEST
);
257 r
= dhcpv6_request(DHCPV6_MSG_RENEW
);
258 odhcp6c_signal_process();
259 if (r
> 0) // Publish updates
260 script_call("updated");
262 continue; // Renew was successful
264 odhcp6c_clear_state(STATE_SERVER_ID
); // Remove binding
266 // If we have IAs, try rebind otherwise restart
267 res
= dhcpv6_request(DHCPV6_MSG_REBIND
);
268 odhcp6c_signal_process();
270 odhcp6c_get_state(STATE_IA_PD
, &ia_pd_new
);
271 odhcp6c_get_state(STATE_IA_NA
, &ia_na_new
);
272 if (res
< 0 || (ia_pd_new
== 0 && ia_pd_len
) ||
273 (ia_na_new
== 0 && ia_na_len
))
274 break; // We lost all our IAs, restart
276 script_call("rebound");
280 size_t ia_pd_len
, ia_na_len
, server_id_len
;
281 odhcp6c_get_state(STATE_IA_PD
, &ia_pd_len
);
282 odhcp6c_get_state(STATE_IA_NA
, &ia_na_len
);
283 odhcp6c_get_state(STATE_SERVER_ID
, &server_id_len
);
285 // Add all prefixes to lost prefixes
287 script_call("unbound");
289 if (server_id_len
> 0 && (ia_pd_len
> 0 || ia_na_len
> 0) && release
)
290 dhcpv6_request(DHCPV6_MSG_RELEASE
);
292 odhcp6c_clear_state(STATE_IA_NA
);
293 odhcp6c_clear_state(STATE_IA_PD
);
296 script_call("stopped");
301 static int usage(void)
304 "Usage: odhcp6c [options] <interface>\n"
305 "\nFeature options:\n"
306 " -S Don't allow SLAAC-only (implied by -P)\n"
307 " -N <mode> Mode for requesting addresses [try|force|none]\n"
308 " -P <length> Request IPv6-Prefix (0 = auto)\n"
309 " -c <clientid> Override client-ID (base-16 encoded)\n"
310 " -r <options> Options to be requested (comma-separated)\n"
311 " -s <script> Status update script (/usr/sbin/odhcp6c-update)\n"
312 " -k Don't send a RELEASE when stopping\n"
313 "\nInvocation options:\n"
314 " -p <pidfile> Set pidfile (/var/run/6relayd.pid)\n"
316 //" -v Increase logging verbosity\n"
317 " -h Show this help\n\n";
318 write(STDERR_FILENO
, buf
, sizeof(buf
));
323 // Don't want to pull-in librt and libpthread just for a monotonic clock...
324 uint64_t odhcp6c_get_milli_time(void)
326 struct timespec t
= {0, 0};
327 syscall(SYS_clock_gettime
, CLOCK_MONOTONIC
, &t
);
328 return t
.tv_sec
* 1000 + t
.tv_nsec
/ 1000000;
332 static uint8_t* odhcp6c_resize_state(enum odhcp6c_state state
, ssize_t len
)
335 return state_data
[state
] + state_len
[state
];
336 else if (state_len
[state
] + len
> 1024)
339 uint8_t *n
= realloc(state_data
[state
], state_len
[state
] + len
);
340 if (n
|| state_len
[state
] + len
== 0) {
341 state_data
[state
] = n
;
342 n
+= state_len
[state
];
343 state_len
[state
] += len
;
349 bool odhcp6c_signal_process(void)
351 if (do_signal
== SIGIO
) {
353 bool updated
= ra_process();
354 updated
|= ra_rtnl_process();
355 if (updated
&& (bound
|| allow_slaac_only
)) {
357 script_call("ra-updated");
361 return do_signal
!= 0;
365 void odhcp6c_clear_state(enum odhcp6c_state state
)
367 state_len
[state
] = 0;
371 void odhcp6c_add_state(enum odhcp6c_state state
, const void *data
, size_t len
)
373 uint8_t *n
= odhcp6c_resize_state(state
, len
);
375 memcpy(n
, data
, len
);
379 size_t odhcp6c_remove_state(enum odhcp6c_state state
, size_t offset
, size_t len
)
381 uint8_t *data
= state_data
[state
];
382 ssize_t len_after
= state_len
[state
] - (offset
+ len
);
384 return state_len
[state
];
386 memmove(data
+ offset
, data
+ offset
+ len
, len_after
);
387 return state_len
[state
] -= len
;
391 void* odhcp6c_get_state(enum odhcp6c_state state
, size_t *len
)
393 *len
= state_len
[state
];
394 return state_data
[state
];
398 struct odhcp6c_entry
* odhcp6c_find_entry(enum odhcp6c_state state
, const struct odhcp6c_entry
*new)
400 size_t len
, cmplen
= offsetof(struct odhcp6c_entry
, target
) + new->length
/ 8;
401 struct odhcp6c_entry
*start
= odhcp6c_get_state(state
, &len
);
402 struct odhcp6c_entry
*x
= NULL
;
404 for (struct odhcp6c_entry
*c
= start
; !x
&& c
< &start
[len
/sizeof(*c
)]; ++c
)
405 if (!memcmp(c
, new, cmplen
))
412 void odhcp6c_update_entry_safe(enum odhcp6c_state state
, struct odhcp6c_entry
*new, uint32_t safe
)
415 struct odhcp6c_entry
*x
= odhcp6c_find_entry(state
, new);
416 struct odhcp6c_entry
*start
= odhcp6c_get_state(state
, &len
);
418 if (x
&& x
->valid
> new->valid
&& new->valid
< safe
)
421 if (new->valid
> 0) {
423 x
->valid
= new->valid
;
424 x
->preferred
= new->preferred
;
426 odhcp6c_add_state(state
, new, sizeof(*new));
429 odhcp6c_remove_state(state
, (x
- start
) * sizeof(*x
), sizeof(*x
));
434 void odhcp6c_update_entry(enum odhcp6c_state state
, struct odhcp6c_entry
*new)
436 odhcp6c_update_entry_safe(state
, new, 0);
440 static void odhcp6c_expire_list(enum odhcp6c_state state
, uint32_t elapsed
)
443 struct odhcp6c_entry
*start
= odhcp6c_get_state(state
, &len
);
444 for (struct odhcp6c_entry
*c
= start
; c
< &start
[len
/ sizeof(*c
)]; ++c
) {
445 if (c
->preferred
< elapsed
)
447 else if (c
->preferred
!= UINT32_MAX
)
448 c
->preferred
-= elapsed
;
450 if (c
->valid
< elapsed
)
452 else if (c
->valid
!= UINT32_MAX
)
456 odhcp6c_remove_state(state
, (c
- start
) * sizeof(*c
), sizeof(*c
));
461 void odhcp6c_expire(void)
463 static time_t last_update
= 0;
464 time_t now
= odhcp6c_get_milli_time() / 1000;
466 uint32_t elapsed
= now
- last_update
;
469 odhcp6c_expire_list(STATE_RA_PREFIX
, elapsed
);
470 odhcp6c_expire_list(STATE_RA_ROUTE
, elapsed
);
471 odhcp6c_expire_list(STATE_RA_DNS
, elapsed
);
472 odhcp6c_expire_list(STATE_IA_NA
, elapsed
);
473 odhcp6c_expire_list(STATE_IA_PD
, elapsed
);
477 void odhcp6c_random(void *buf
, size_t len
)
479 read(urandom_fd
, buf
, len
);
483 static void sighandler(int signal
)
485 if (signal
== SIGCHLD
)
486 while (waitpid(-1, NULL
, WNOHANG
) > 0);
487 else if (signal
== SIGUSR1
)
489 else if (signal
== SIGUSR2
)
491 else if (signal
== SIGIO
)