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.
28 #include <sys/syscall.h>
33 static void sighandler(int signal
);
34 static int usage(void);
37 static uint8_t *state_data
[_STATE_MAX
] = {NULL
};
38 static size_t state_len
[_STATE_MAX
] = {0};
40 static volatile int do_signal
= 0;
43 int main(_unused
int argc
, char* const argv
[])
45 openlog("odhcp6c", LOG_PERROR
| LOG_PID
, LOG_DAEMON
);
47 // Allocate ressources
48 const char *pidfile
= NULL
;
49 const char *script
= "/usr/sbin/odhcp6c-update";
54 enum odhcp6c_ia_mode ia_na_mode
= IA_MODE_TRY
;
56 bool help
= false, daemonize
= false;
57 int c
, request_pd
= 0, timeout
= 0;
58 while ((c
= getopt(argc
, argv
, "N:P:c:r:s:t:hdp:")) != -1) {
61 if (!strcmp(optarg
, "force"))
62 ia_na_mode
= IA_MODE_FORCE
;
63 else if (!strcmp(optarg
, "none"))
64 ia_na_mode
= IA_MODE_NONE
;
65 else if (!strcmp(optarg
, "try"))
66 ia_na_mode
= IA_MODE_TRY
;
72 request_pd
= strtoul(optarg
, NULL
, 10);
78 l
= script_unhexlify(&buf
[4], sizeof(buf
) - 4, optarg
);
81 buf
[1] = DHCPV6_OPT_CLIENTID
;
84 odhcp6c_add_state(STATE_CLIENT_ID
, buf
, l
+ 4);
93 opttype
= htons(strtoul(optarg
, &optpos
, 10));
98 odhcp6c_add_state(STATE_ORO
, &opttype
, 2);
107 timeout
= strtoul(optarg
, NULL
, 10);
124 const char *ifname
= argv
[optind
];
129 if (init_dhcpv6(ifname
, request_pd
) || init_rtnetlink() ||
130 script_init(script
, ifname
)) {
131 syslog(LOG_ERR
, "failed to initialize: %s", strerror(errno
));
135 signal(SIGHUP
, sighandler
);
136 signal(SIGINT
, sighandler
);
137 signal(SIGALRM
, sighandler
);
138 signal(SIGCHLD
, sighandler
);
139 signal(SIGTERM
, sighandler
);
140 signal(SIGUSR1
, sighandler
);
141 signal(SIGUSR2
, sighandler
);
144 openlog("odhcp6c", LOG_PID
, LOG_DAEMON
); // Disable LOG_PERROR
146 syslog(LOG_ERR
, "Failed to daemonize: %s",
153 snprintf(pidbuf
, sizeof(pidbuf
),
154 "/var/run/odhcp6c.%s.pid", ifname
);
158 int fd
= open(pidfile
, O_WRONLY
| O_CREAT
);
161 int len
= snprintf(buf
, sizeof(buf
), "%i\n", getpid());
167 script_call("started");
169 while (do_signal
!= SIGTERM
) { // Main logic
170 odhcp6c_clear_state(STATE_SERVER_ID
);
171 odhcp6c_clear_state(STATE_SERVER_CAND
);
172 odhcp6c_clear_state(STATE_IA_PD
);
173 odhcp6c_clear_state(STATE_IA_PD_LOST
);
174 odhcp6c_clear_state(STATE_SNTP_IP
);
175 odhcp6c_clear_state(STATE_SNTP_FQDN
);
176 odhcp6c_clear_state(STATE_SIP_IP
);
177 odhcp6c_clear_state(STATE_SIP_FQDN
);
178 dhcpv6_set_ia_na_mode(ia_na_mode
);
182 int res
= dhcpv6_request(DHCPV6_MSG_SOLICIT
);
185 continue; // Might happen if we got a signal
186 } else if (res
== DHCPV6_STATELESS
) { // Stateless mode
187 while (do_signal
== 0 || do_signal
== SIGUSR1
) {
190 res
= dhcpv6_request(DHCPV6_MSG_INFO_REQ
);
191 if (do_signal
== SIGUSR1
)
196 script_call("informed");
199 if (dhcpv6_poll_reconfigure() > 0)
200 script_call("informed");
203 if (do_signal
== SIGALRM
)
204 script_call("timeout");
210 if (dhcpv6_request(DHCPV6_MSG_REQUEST
) < 0)
213 script_call("bound");
216 while (do_signal
== 0 || do_signal
== SIGUSR1
) {
218 // Wait for T1 to expire or until we get a reconfigure
219 int res
= dhcpv6_poll_reconfigure();
222 script_call("updated");
227 // Handle signal, if necessary
228 if (do_signal
== SIGUSR1
)
229 do_signal
= 0; // Acknowledged
230 else if (do_signal
> 0)
231 break; // Other signal type
233 size_t ia_pd_len
, ia_na_len
, ia_pd_new
, ia_na_new
;
234 odhcp6c_get_state(STATE_IA_PD
, &ia_pd_len
);
235 odhcp6c_get_state(STATE_IA_NA
, &ia_na_len
);
237 // If we have any IAs, send renew, otherwise request
239 if (ia_pd_len
== 0 && ia_na_len
== 0)
240 r
= dhcpv6_request(DHCPV6_MSG_REQUEST
);
242 r
= dhcpv6_request(DHCPV6_MSG_RENEW
);
243 if (r
> 0) // Publish updates
244 script_call("updated");
246 continue; // Renew was successful
248 odhcp6c_clear_state(STATE_SERVER_ID
); // Remove binding
250 // If we have IAs, try rebind otherwise restart
251 res
= dhcpv6_request(DHCPV6_MSG_REBIND
);
253 odhcp6c_get_state(STATE_IA_PD
, &ia_pd_new
);
254 odhcp6c_get_state(STATE_IA_NA
, &ia_na_new
);
255 if (res
< 0 || (ia_pd_new
== 0 && ia_pd_len
) ||
256 (ia_na_new
== 0 && ia_na_len
))
257 break; // We lost all our IAs, restart
259 script_call("rebound");
263 size_t ia_pd_len
, ia_na_len
, server_id_len
;
264 uint8_t *ia_pd
= odhcp6c_get_state(STATE_IA_PD
, &ia_pd_len
);
265 odhcp6c_get_state(STATE_IA_NA
, &ia_na_len
);
266 odhcp6c_get_state(STATE_SERVER_ID
, &server_id_len
);
268 // Add all prefixes to lost prefixes
269 odhcp6c_add_state(STATE_IA_PD_LOST
, ia_pd
, ia_pd_len
);
270 odhcp6c_clear_state(STATE_IA_PD
);
272 if (do_signal
== SIGALRM
)
273 script_call("timeout");
275 script_call("unbound");
277 // Remove assigned addresses
279 dhcpv6_remove_addrs();
281 if (server_id_len
> 0 && (ia_pd_len
> 0 || ia_na_len
> 0))
282 dhcpv6_request(DHCPV6_MSG_RELEASE
);
285 script_call("stopped");
290 static int usage(void)
293 "Usage: odhcp6c [options] <interface>\n"
294 "\nFeature options:\n"
295 " -N <mode> Mode for requesting addresses [try|force|none]\n"
296 " -P <length> Request IPv6-Prefix (0 = auto)\n"
297 " -c <clientid> Override client-ID (base-16 encoded)\n"
298 " -r <options> Options to be requested (comma-separated)\n"
299 " -s <script> Status update script (/usr/sbin/odhcp6c-update)\n"
300 " -t <timeout> Request timeout after which the script is called\n"
301 "\nInvocation options:\n"
302 " -p <pidfile> Set pidfile (/var/run/6relayd.pid)\n"
304 //" -v Increase logging verbosity\n"
305 " -h Show this help\n\n";
306 write(STDERR_FILENO
, buf
, sizeof(buf
));
311 // Don't want to pull-in librt and libpthread just for a monotonic clock...
312 uint64_t odhcp6c_get_milli_time(void)
314 struct timespec t
= {0, 0};
315 syscall(SYS_clock_gettime
, CLOCK_MONOTONIC
, &t
);
316 return t
.tv_sec
* 1000 + t
.tv_nsec
/ 1000000;
320 static uint8_t* odhcp6c_resize_state(enum odhcp6c_state state
, ssize_t len
)
323 return state_data
[state
] + state_len
[state
];
325 uint8_t *n
= realloc(state_data
[state
], state_len
[state
] + len
);
326 if (n
|| state_len
[state
] + len
== 0) {
327 state_data
[state
] = n
;
328 n
+= state_len
[state
];
329 state_len
[state
] += len
;
335 bool odhcp6c_signal_is_pending(void)
337 return do_signal
!= 0;
341 void odhcp6c_clear_state(enum odhcp6c_state state
)
343 state_len
[state
] = 0;
347 void odhcp6c_add_state(enum odhcp6c_state state
, const void *data
, size_t len
)
349 uint8_t *n
= odhcp6c_resize_state(state
, len
);
351 memcpy(n
, data
, len
);
355 size_t odhcp6c_remove_state(enum odhcp6c_state state
, size_t offset
, size_t len
)
357 uint8_t *data
= state_data
[state
];
358 ssize_t len_after
= state_len
[state
] - (offset
+ len
);
360 return state_len
[state
];
362 memmove(data
+ offset
, data
+ offset
+ len
, len_after
);
363 return state_len
[state
] -= len
;
367 bool odhcp6c_commit_state(enum odhcp6c_state state
, size_t old_len
)
369 size_t new_len
= state_len
[state
] - old_len
;
370 uint8_t *old_data
= state_data
[state
], *new_data
= old_data
+ old_len
;
371 bool upd
= new_len
!= old_len
|| memcmp(old_data
, new_data
, new_len
);
373 memmove(old_data
, new_data
, new_len
);
374 odhcp6c_resize_state(state
, -old_len
);
380 void* odhcp6c_get_state(enum odhcp6c_state state
, size_t *len
)
382 *len
= state_len
[state
];
383 return state_data
[state
];
387 static void sighandler(int signal
)
389 if (signal
== SIGCHLD
)
390 while (waitpid(-1, NULL
, WNOHANG
) > 0);
391 else if (signal
== SIGUSR1
)
393 else if (signal
== SIGUSR2
)
395 else if (signal
== SIGALRM
)