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;
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:hdp:")) != -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);
129 const char *ifname
= argv
[optind
];
134 if ((urandom_fd
= open("/dev/urandom", O_CLOEXEC
| O_RDONLY
)) < 0 ||
135 init_dhcpv6(ifname
, request_pd
) || ra_init(ifname
) ||
136 script_init(script
, ifname
)) {
137 syslog(LOG_ERR
, "failed to initialize: %s", strerror(errno
));
141 signal(SIGIO
, sighandler
);
142 signal(SIGHUP
, sighandler
);
143 signal(SIGINT
, sighandler
);
144 signal(SIGCHLD
, sighandler
);
145 signal(SIGTERM
, sighandler
);
146 signal(SIGUSR1
, sighandler
);
147 signal(SIGUSR2
, sighandler
);
150 openlog("odhcp6c", LOG_PID
, LOG_DAEMON
); // Disable LOG_PERROR
152 syslog(LOG_ERR
, "Failed to daemonize: %s",
159 snprintf(pidbuf
, sizeof(pidbuf
),
160 "/var/run/odhcp6c.%s.pid", ifname
);
164 int fd
= open(pidfile
, O_WRONLY
| O_CREAT
);
167 int len
= snprintf(buf
, sizeof(buf
), "%i\n", getpid());
173 script_call("started");
175 while (do_signal
!= SIGTERM
) { // Main logic
176 odhcp6c_clear_state(STATE_SERVER_ID
);
177 odhcp6c_clear_state(STATE_SERVER_CAND
);
178 odhcp6c_clear_state(STATE_IA_PD
);
179 odhcp6c_clear_state(STATE_SNTP_IP
);
180 odhcp6c_clear_state(STATE_SNTP_FQDN
);
181 odhcp6c_clear_state(STATE_SIP_IP
);
182 odhcp6c_clear_state(STATE_SIP_FQDN
);
183 dhcpv6_set_ia_na_mode(ia_na_mode
);
187 int res
= dhcpv6_request(DHCPV6_MSG_SOLICIT
);
188 odhcp6c_signal_process();
191 continue; // Might happen if we got a signal
192 } else if (res
== DHCPV6_STATELESS
) { // Stateless mode
193 while (do_signal
== 0 || do_signal
== SIGUSR1
) {
196 res
= dhcpv6_request(DHCPV6_MSG_INFO_REQ
);
197 odhcp6c_signal_process();
198 if (do_signal
== SIGUSR1
)
203 script_call("informed");
207 if (dhcpv6_poll_reconfigure() > 0)
208 script_call("informed");
215 if (dhcpv6_request(DHCPV6_MSG_REQUEST
) < 0)
218 odhcp6c_signal_process();
219 script_call("bound");
222 while (do_signal
== 0 || do_signal
== SIGUSR1
) {
224 // Wait for T1 to expire or until we get a reconfigure
225 int res
= dhcpv6_poll_reconfigure();
226 odhcp6c_signal_process();
229 script_call("updated");
234 // Handle signal, if necessary
235 if (do_signal
== SIGUSR1
)
236 do_signal
= 0; // Acknowledged
237 else if (do_signal
> 0)
238 break; // Other signal type
240 size_t ia_pd_len
, ia_na_len
, ia_pd_new
, ia_na_new
;
241 odhcp6c_get_state(STATE_IA_PD
, &ia_pd_len
);
242 odhcp6c_get_state(STATE_IA_NA
, &ia_na_len
);
244 // If we have any IAs, send renew, otherwise request
246 if (ia_pd_len
== 0 && ia_na_len
== 0)
247 r
= dhcpv6_request(DHCPV6_MSG_REQUEST
);
249 r
= dhcpv6_request(DHCPV6_MSG_RENEW
);
250 odhcp6c_signal_process();
251 if (r
> 0) // Publish updates
252 script_call("updated");
254 continue; // Renew was successful
256 odhcp6c_clear_state(STATE_SERVER_ID
); // Remove binding
258 // If we have IAs, try rebind otherwise restart
259 res
= dhcpv6_request(DHCPV6_MSG_REBIND
);
260 odhcp6c_signal_process();
262 odhcp6c_get_state(STATE_IA_PD
, &ia_pd_new
);
263 odhcp6c_get_state(STATE_IA_NA
, &ia_na_new
);
264 if (res
< 0 || (ia_pd_new
== 0 && ia_pd_len
) ||
265 (ia_na_new
== 0 && ia_na_len
))
266 break; // We lost all our IAs, restart
268 script_call("rebound");
272 size_t ia_pd_len
, ia_na_len
, server_id_len
;
273 odhcp6c_get_state(STATE_IA_PD
, &ia_pd_len
);
274 odhcp6c_get_state(STATE_IA_NA
, &ia_na_len
);
275 odhcp6c_get_state(STATE_SERVER_ID
, &server_id_len
);
277 // Add all prefixes to lost prefixes
279 script_call("unbound");
281 if (server_id_len
> 0 && (ia_pd_len
> 0 || ia_na_len
> 0))
282 dhcpv6_request(DHCPV6_MSG_RELEASE
);
284 odhcp6c_clear_state(STATE_IA_NA
);
285 odhcp6c_clear_state(STATE_IA_PD
);
288 script_call("stopped");
293 static int usage(void)
296 "Usage: odhcp6c [options] <interface>\n"
297 "\nFeature options:\n"
298 " -S Don't allow SLAAC-only (implied by -P)\n"
299 " -N <mode> Mode for requesting addresses [try|force|none]\n"
300 " -P <length> Request IPv6-Prefix (0 = auto)\n"
301 " -c <clientid> Override client-ID (base-16 encoded)\n"
302 " -r <options> Options to be requested (comma-separated)\n"
303 " -s <script> Status update script (/usr/sbin/odhcp6c-update)\n"
304 "\nInvocation options:\n"
305 " -p <pidfile> Set pidfile (/var/run/6relayd.pid)\n"
307 //" -v Increase logging verbosity\n"
308 " -h Show this help\n\n";
309 write(STDERR_FILENO
, buf
, sizeof(buf
));
314 // Don't want to pull-in librt and libpthread just for a monotonic clock...
315 uint64_t odhcp6c_get_milli_time(void)
317 struct timespec t
= {0, 0};
318 syscall(SYS_clock_gettime
, CLOCK_MONOTONIC
, &t
);
319 return t
.tv_sec
* 1000 + t
.tv_nsec
/ 1000000;
323 static uint8_t* odhcp6c_resize_state(enum odhcp6c_state state
, ssize_t len
)
326 return state_data
[state
] + state_len
[state
];
327 else if (state_len
[state
] + len
> 1024)
330 uint8_t *n
= realloc(state_data
[state
], state_len
[state
] + len
);
331 if (n
|| state_len
[state
] + len
== 0) {
332 state_data
[state
] = n
;
333 n
+= state_len
[state
];
334 state_len
[state
] += len
;
340 bool odhcp6c_signal_process(void)
342 if (do_signal
== SIGIO
) {
344 bool updated
= ra_process();
345 updated
|= ra_rtnl_process();
346 if (updated
&& (bound
|| allow_slaac_only
)) {
348 script_call("ra-updated");
352 return do_signal
!= 0;
356 void odhcp6c_clear_state(enum odhcp6c_state state
)
358 state_len
[state
] = 0;
362 void odhcp6c_add_state(enum odhcp6c_state state
, const void *data
, size_t len
)
364 uint8_t *n
= odhcp6c_resize_state(state
, len
);
366 memcpy(n
, data
, len
);
370 size_t odhcp6c_remove_state(enum odhcp6c_state state
, size_t offset
, size_t len
)
372 uint8_t *data
= state_data
[state
];
373 ssize_t len_after
= state_len
[state
] - (offset
+ len
);
375 return state_len
[state
];
377 memmove(data
+ offset
, data
+ offset
+ len
, len_after
);
378 return state_len
[state
] -= len
;
382 void* odhcp6c_get_state(enum odhcp6c_state state
, size_t *len
)
384 *len
= state_len
[state
];
385 return state_data
[state
];
389 struct odhcp6c_entry
* odhcp6c_find_entry(enum odhcp6c_state state
, const struct odhcp6c_entry
*new)
391 size_t len
, cmplen
= offsetof(struct odhcp6c_entry
, target
) + new->length
/ 8;
392 struct odhcp6c_entry
*start
= odhcp6c_get_state(state
, &len
);
393 struct odhcp6c_entry
*x
= NULL
;
395 for (struct odhcp6c_entry
*c
= start
; !x
&& c
< &start
[len
/sizeof(*c
)]; ++c
)
396 if (!memcmp(c
, new, cmplen
))
403 void odhcp6c_update_entry_safe(enum odhcp6c_state state
, struct odhcp6c_entry
*new, uint32_t safe
)
406 struct odhcp6c_entry
*x
= odhcp6c_find_entry(state
, new);
407 struct odhcp6c_entry
*start
= odhcp6c_get_state(state
, &len
);
409 if (x
&& x
->valid
> new->valid
&& new->valid
< safe
)
412 if (new->valid
> 0) {
414 x
->valid
= new->valid
;
415 x
->preferred
= new->preferred
;
417 odhcp6c_add_state(state
, new, sizeof(*new));
420 odhcp6c_remove_state(state
, (x
- start
) * sizeof(*x
), sizeof(*x
));
425 void odhcp6c_update_entry(enum odhcp6c_state state
, struct odhcp6c_entry
*new)
427 odhcp6c_update_entry_safe(state
, new, 0);
431 static void odhcp6c_expire_list(enum odhcp6c_state state
, uint32_t elapsed
)
434 struct odhcp6c_entry
*start
= odhcp6c_get_state(state
, &len
);
435 for (struct odhcp6c_entry
*c
= start
; c
< &start
[len
/ sizeof(*c
)]; ++c
) {
436 if (c
->preferred
< elapsed
)
438 else if (c
->preferred
!= UINT32_MAX
)
439 c
->preferred
-= elapsed
;
441 if (c
->valid
< elapsed
)
443 else if (c
->valid
!= UINT32_MAX
)
447 odhcp6c_remove_state(state
, (c
- start
) * sizeof(*c
), sizeof(*c
));
452 void odhcp6c_expire(void)
454 static time_t last_update
= 0;
455 time_t now
= odhcp6c_get_milli_time() / 1000;
457 uint32_t elapsed
= now
- last_update
;
460 odhcp6c_expire_list(STATE_RA_PREFIX
, elapsed
);
461 odhcp6c_expire_list(STATE_RA_ROUTE
, elapsed
);
462 odhcp6c_expire_list(STATE_RA_DNS
, elapsed
);
463 odhcp6c_expire_list(STATE_IA_NA
, elapsed
);
464 odhcp6c_expire_list(STATE_IA_PD
, elapsed
);
468 void odhcp6c_random(void *buf
, size_t len
)
470 read(urandom_fd
, buf
, len
);
474 static void sighandler(int signal
)
476 if (signal
== SIGCHLD
)
477 while (waitpid(-1, NULL
, WNOHANG
) > 0);
478 else if (signal
== SIGUSR1
)
480 else if (signal
== SIGUSR2
)
482 else if (signal
== SIGIO
)