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_SNTP_IP
);
174 odhcp6c_clear_state(STATE_SNTP_FQDN
);
175 odhcp6c_clear_state(STATE_SIP_IP
);
176 odhcp6c_clear_state(STATE_SIP_FQDN
);
177 dhcpv6_set_ia_na_mode(ia_na_mode
);
181 int res
= dhcpv6_request(DHCPV6_MSG_SOLICIT
);
184 continue; // Might happen if we got a signal
185 } else if (res
== DHCPV6_STATELESS
) { // Stateless mode
186 while (do_signal
== 0 || do_signal
== SIGUSR1
) {
189 res
= dhcpv6_request(DHCPV6_MSG_INFO_REQ
);
190 if (do_signal
== SIGUSR1
)
195 script_call("informed");
198 if (dhcpv6_poll_reconfigure() > 0)
199 script_call("informed");
202 if (do_signal
== SIGALRM
)
203 script_call("timeout");
209 if (dhcpv6_request(DHCPV6_MSG_REQUEST
) < 0)
212 script_call("bound");
215 while (do_signal
== 0 || do_signal
== SIGUSR1
) {
217 // Wait for T1 to expire or until we get a reconfigure
218 int res
= dhcpv6_poll_reconfigure();
221 script_call("updated");
226 // Handle signal, if necessary
227 if (do_signal
== SIGUSR1
)
228 do_signal
= 0; // Acknowledged
229 else if (do_signal
> 0)
230 break; // Other signal type
232 size_t ia_pd_len
, ia_na_len
, ia_pd_new
, ia_na_new
;
233 odhcp6c_get_state(STATE_IA_PD
, &ia_pd_len
);
234 odhcp6c_get_state(STATE_IA_NA
, &ia_na_len
);
236 // If we have any IAs, send renew, otherwise request
238 if (ia_pd_len
== 0 && ia_na_len
== 0)
239 r
= dhcpv6_request(DHCPV6_MSG_REQUEST
);
241 r
= dhcpv6_request(DHCPV6_MSG_RENEW
);
242 if (r
> 0) // Publish updates
243 script_call("updated");
245 continue; // Renew was successful
247 odhcp6c_clear_state(STATE_SERVER_ID
); // Remove binding
249 // If we have IAs, try rebind otherwise restart
250 res
= dhcpv6_request(DHCPV6_MSG_REBIND
);
252 odhcp6c_get_state(STATE_IA_PD
, &ia_pd_new
);
253 odhcp6c_get_state(STATE_IA_NA
, &ia_na_new
);
254 if (res
< 0 || (ia_pd_new
== 0 && ia_pd_len
) ||
255 (ia_na_new
== 0 && ia_na_len
))
256 break; // We lost all our IAs, restart
258 script_call("rebound");
262 size_t ia_pd_len
, ia_na_len
, server_id_len
;
263 odhcp6c_get_state(STATE_IA_PD
, &ia_pd_len
);
264 odhcp6c_get_state(STATE_IA_NA
, &ia_na_len
);
265 odhcp6c_get_state(STATE_SERVER_ID
, &server_id_len
);
267 // Add all prefixes to lost prefixes
268 odhcp6c_clear_state(STATE_IA_PD
);
270 if (do_signal
== SIGALRM
)
271 script_call("timeout");
273 script_call("unbound");
275 // Remove assigned addresses
277 dhcpv6_remove_addrs();
279 if (server_id_len
> 0 && (ia_pd_len
> 0 || ia_na_len
> 0))
280 dhcpv6_request(DHCPV6_MSG_RELEASE
);
283 script_call("stopped");
288 static int usage(void)
291 "Usage: odhcp6c [options] <interface>\n"
292 "\nFeature options:\n"
293 " -N <mode> Mode for requesting addresses [try|force|none]\n"
294 " -P <length> Request IPv6-Prefix (0 = auto)\n"
295 " -c <clientid> Override client-ID (base-16 encoded)\n"
296 " -r <options> Options to be requested (comma-separated)\n"
297 " -s <script> Status update script (/usr/sbin/odhcp6c-update)\n"
298 " -t <timeout> Request timeout after which the script is called\n"
299 "\nInvocation options:\n"
300 " -p <pidfile> Set pidfile (/var/run/6relayd.pid)\n"
302 //" -v Increase logging verbosity\n"
303 " -h Show this help\n\n";
304 write(STDERR_FILENO
, buf
, sizeof(buf
));
309 // Don't want to pull-in librt and libpthread just for a monotonic clock...
310 uint64_t odhcp6c_get_milli_time(void)
312 struct timespec t
= {0, 0};
313 syscall(SYS_clock_gettime
, CLOCK_MONOTONIC
, &t
);
314 return t
.tv_sec
* 1000 + t
.tv_nsec
/ 1000000;
318 static uint8_t* odhcp6c_resize_state(enum odhcp6c_state state
, ssize_t len
)
321 return state_data
[state
] + state_len
[state
];
323 uint8_t *n
= realloc(state_data
[state
], state_len
[state
] + len
);
324 if (n
|| state_len
[state
] + len
== 0) {
325 state_data
[state
] = n
;
326 n
+= state_len
[state
];
327 state_len
[state
] += len
;
333 bool odhcp6c_signal_is_pending(void)
335 return do_signal
!= 0;
339 void odhcp6c_clear_state(enum odhcp6c_state state
)
341 state_len
[state
] = 0;
345 void odhcp6c_add_state(enum odhcp6c_state state
, const void *data
, size_t len
)
347 uint8_t *n
= odhcp6c_resize_state(state
, len
);
349 memcpy(n
, data
, len
);
353 size_t odhcp6c_remove_state(enum odhcp6c_state state
, size_t offset
, size_t len
)
355 uint8_t *data
= state_data
[state
];
356 ssize_t len_after
= state_len
[state
] - (offset
+ len
);
358 return state_len
[state
];
360 memmove(data
+ offset
, data
+ offset
+ len
, len_after
);
361 return state_len
[state
] -= len
;
365 bool odhcp6c_commit_state(enum odhcp6c_state state
, size_t old_len
)
367 size_t new_len
= state_len
[state
] - old_len
;
368 uint8_t *old_data
= state_data
[state
], *new_data
= old_data
+ old_len
;
369 bool upd
= new_len
!= old_len
|| memcmp(old_data
, new_data
, new_len
);
371 memmove(old_data
, new_data
, new_len
);
372 odhcp6c_resize_state(state
, -old_len
);
378 void* odhcp6c_get_state(enum odhcp6c_state state
, size_t *len
)
380 *len
= state_len
[state
];
381 return state_data
[state
];
385 static void sighandler(int signal
)
387 if (signal
== SIGCHLD
)
388 while (waitpid(-1, NULL
, WNOHANG
) > 0);
389 else if (signal
== SIGUSR1
)
391 else if (signal
== SIGUSR2
)
393 else if (signal
== SIGALRM
)