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
);
186 syslog(LOG_NOTICE
, "(re)starting transaction on %s", ifname
);
189 int res
= dhcpv6_request(DHCPV6_MSG_SOLICIT
);
190 odhcp6c_signal_process();
193 continue; // Might happen if we got a signal
194 } else if (res
== DHCPV6_STATELESS
) { // Stateless mode
195 while (do_signal
== 0 || do_signal
== SIGUSR1
) {
198 res
= dhcpv6_request(DHCPV6_MSG_INFO_REQ
);
199 odhcp6c_signal_process();
200 if (do_signal
== SIGUSR1
)
205 script_call("informed");
208 syslog(LOG_NOTICE
, "entering stateless-mode on %s", ifname
);
210 if (dhcpv6_poll_reconfigure() > 0)
211 script_call("informed");
218 if (dhcpv6_request(DHCPV6_MSG_REQUEST
) < 0)
221 odhcp6c_signal_process();
222 script_call("bound");
224 syslog(LOG_NOTICE
, "entering stateful-mode on %s", ifname
);
226 while (do_signal
== 0 || do_signal
== SIGUSR1
) {
228 // Wait for T1 to expire or until we get a reconfigure
229 int res
= dhcpv6_poll_reconfigure();
230 odhcp6c_signal_process();
233 script_call("updated");
238 // Handle signal, if necessary
239 if (do_signal
== SIGUSR1
)
240 do_signal
= 0; // Acknowledged
241 else if (do_signal
> 0)
242 break; // Other signal type
244 size_t ia_pd_len
, ia_na_len
, ia_pd_new
, ia_na_new
;
245 odhcp6c_get_state(STATE_IA_PD
, &ia_pd_len
);
246 odhcp6c_get_state(STATE_IA_NA
, &ia_na_len
);
248 // If we have any IAs, send renew, otherwise request
250 if (ia_pd_len
== 0 && ia_na_len
== 0)
251 r
= dhcpv6_request(DHCPV6_MSG_REQUEST
);
253 r
= dhcpv6_request(DHCPV6_MSG_RENEW
);
254 odhcp6c_signal_process();
255 if (r
> 0) // Publish updates
256 script_call("updated");
258 continue; // Renew was successful
260 odhcp6c_clear_state(STATE_SERVER_ID
); // Remove binding
262 // If we have IAs, try rebind otherwise restart
263 res
= dhcpv6_request(DHCPV6_MSG_REBIND
);
264 odhcp6c_signal_process();
266 odhcp6c_get_state(STATE_IA_PD
, &ia_pd_new
);
267 odhcp6c_get_state(STATE_IA_NA
, &ia_na_new
);
268 if (res
< 0 || (ia_pd_new
== 0 && ia_pd_len
) ||
269 (ia_na_new
== 0 && ia_na_len
))
270 break; // We lost all our IAs, restart
272 script_call("rebound");
276 size_t ia_pd_len
, ia_na_len
, server_id_len
;
277 odhcp6c_get_state(STATE_IA_PD
, &ia_pd_len
);
278 odhcp6c_get_state(STATE_IA_NA
, &ia_na_len
);
279 odhcp6c_get_state(STATE_SERVER_ID
, &server_id_len
);
281 // Add all prefixes to lost prefixes
283 script_call("unbound");
285 if (server_id_len
> 0 && (ia_pd_len
> 0 || ia_na_len
> 0))
286 dhcpv6_request(DHCPV6_MSG_RELEASE
);
288 odhcp6c_clear_state(STATE_IA_NA
);
289 odhcp6c_clear_state(STATE_IA_PD
);
292 script_call("stopped");
297 static int usage(void)
300 "Usage: odhcp6c [options] <interface>\n"
301 "\nFeature options:\n"
302 " -S Don't allow SLAAC-only (implied by -P)\n"
303 " -N <mode> Mode for requesting addresses [try|force|none]\n"
304 " -P <length> Request IPv6-Prefix (0 = auto)\n"
305 " -c <clientid> Override client-ID (base-16 encoded)\n"
306 " -r <options> Options to be requested (comma-separated)\n"
307 " -s <script> Status update script (/usr/sbin/odhcp6c-update)\n"
308 "\nInvocation options:\n"
309 " -p <pidfile> Set pidfile (/var/run/6relayd.pid)\n"
311 //" -v Increase logging verbosity\n"
312 " -h Show this help\n\n";
313 write(STDERR_FILENO
, buf
, sizeof(buf
));
318 // Don't want to pull-in librt and libpthread just for a monotonic clock...
319 uint64_t odhcp6c_get_milli_time(void)
321 struct timespec t
= {0, 0};
322 syscall(SYS_clock_gettime
, CLOCK_MONOTONIC
, &t
);
323 return t
.tv_sec
* 1000 + t
.tv_nsec
/ 1000000;
327 static uint8_t* odhcp6c_resize_state(enum odhcp6c_state state
, ssize_t len
)
330 return state_data
[state
] + state_len
[state
];
331 else if (state_len
[state
] + len
> 1024)
334 uint8_t *n
= realloc(state_data
[state
], state_len
[state
] + len
);
335 if (n
|| state_len
[state
] + len
== 0) {
336 state_data
[state
] = n
;
337 n
+= state_len
[state
];
338 state_len
[state
] += len
;
344 bool odhcp6c_signal_process(void)
346 if (do_signal
== SIGIO
) {
348 bool updated
= ra_process();
349 updated
|= ra_rtnl_process();
350 if (updated
&& (bound
|| allow_slaac_only
)) {
352 script_call("ra-updated");
356 return do_signal
!= 0;
360 void odhcp6c_clear_state(enum odhcp6c_state state
)
362 state_len
[state
] = 0;
366 void odhcp6c_add_state(enum odhcp6c_state state
, const void *data
, size_t len
)
368 uint8_t *n
= odhcp6c_resize_state(state
, len
);
370 memcpy(n
, data
, len
);
374 size_t odhcp6c_remove_state(enum odhcp6c_state state
, size_t offset
, size_t len
)
376 uint8_t *data
= state_data
[state
];
377 ssize_t len_after
= state_len
[state
] - (offset
+ len
);
379 return state_len
[state
];
381 memmove(data
+ offset
, data
+ offset
+ len
, len_after
);
382 return state_len
[state
] -= len
;
386 void* odhcp6c_get_state(enum odhcp6c_state state
, size_t *len
)
388 *len
= state_len
[state
];
389 return state_data
[state
];
393 struct odhcp6c_entry
* odhcp6c_find_entry(enum odhcp6c_state state
, const struct odhcp6c_entry
*new)
395 size_t len
, cmplen
= offsetof(struct odhcp6c_entry
, target
) + new->length
/ 8;
396 struct odhcp6c_entry
*start
= odhcp6c_get_state(state
, &len
);
397 struct odhcp6c_entry
*x
= NULL
;
399 for (struct odhcp6c_entry
*c
= start
; !x
&& c
< &start
[len
/sizeof(*c
)]; ++c
)
400 if (!memcmp(c
, new, cmplen
))
407 void odhcp6c_update_entry_safe(enum odhcp6c_state state
, struct odhcp6c_entry
*new, uint32_t safe
)
410 struct odhcp6c_entry
*x
= odhcp6c_find_entry(state
, new);
411 struct odhcp6c_entry
*start
= odhcp6c_get_state(state
, &len
);
413 if (x
&& x
->valid
> new->valid
&& new->valid
< safe
)
416 if (new->valid
> 0) {
418 x
->valid
= new->valid
;
419 x
->preferred
= new->preferred
;
421 odhcp6c_add_state(state
, new, sizeof(*new));
424 odhcp6c_remove_state(state
, (x
- start
) * sizeof(*x
), sizeof(*x
));
429 void odhcp6c_update_entry(enum odhcp6c_state state
, struct odhcp6c_entry
*new)
431 odhcp6c_update_entry_safe(state
, new, 0);
435 static void odhcp6c_expire_list(enum odhcp6c_state state
, uint32_t elapsed
)
438 struct odhcp6c_entry
*start
= odhcp6c_get_state(state
, &len
);
439 for (struct odhcp6c_entry
*c
= start
; c
< &start
[len
/ sizeof(*c
)]; ++c
) {
440 if (c
->preferred
< elapsed
)
442 else if (c
->preferred
!= UINT32_MAX
)
443 c
->preferred
-= elapsed
;
445 if (c
->valid
< elapsed
)
447 else if (c
->valid
!= UINT32_MAX
)
451 odhcp6c_remove_state(state
, (c
- start
) * sizeof(*c
), sizeof(*c
));
456 void odhcp6c_expire(void)
458 static time_t last_update
= 0;
459 time_t now
= odhcp6c_get_milli_time() / 1000;
461 uint32_t elapsed
= now
- last_update
;
464 odhcp6c_expire_list(STATE_RA_PREFIX
, elapsed
);
465 odhcp6c_expire_list(STATE_RA_ROUTE
, elapsed
);
466 odhcp6c_expire_list(STATE_RA_DNS
, elapsed
);
467 odhcp6c_expire_list(STATE_IA_NA
, elapsed
);
468 odhcp6c_expire_list(STATE_IA_PD
, elapsed
);
472 void odhcp6c_random(void *buf
, size_t len
)
474 read(urandom_fd
, buf
, len
);
478 static void sighandler(int signal
)
480 if (signal
== SIGCHLD
)
481 while (waitpid(-1, NULL
, WNOHANG
) > 0);
482 else if (signal
== SIGUSR1
)
484 else if (signal
== SIGUSR2
)
486 else if (signal
== SIGIO
)