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;
58 while ((c
= getopt(argc
, argv
, "N:P:c:r:s: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);
120 const char *ifname
= argv
[optind
];
125 if (init_dhcpv6(ifname
, request_pd
) || init_rtnetlink() ||
126 script_init(script
, ifname
)) {
127 syslog(LOG_ERR
, "failed to initialize: %s", strerror(errno
));
131 signal(SIGHUP
, sighandler
);
132 signal(SIGINT
, sighandler
);
133 signal(SIGCHLD
, sighandler
);
134 signal(SIGTERM
, sighandler
);
135 signal(SIGUSR1
, sighandler
);
136 signal(SIGUSR2
, sighandler
);
139 openlog("odhcp6c", LOG_PID
, LOG_DAEMON
); // Disable LOG_PERROR
141 syslog(LOG_ERR
, "Failed to daemonize: %s",
148 snprintf(pidbuf
, sizeof(pidbuf
),
149 "/var/run/odhcp6c.%s.pid", ifname
);
153 int fd
= open(pidfile
, O_WRONLY
| O_CREAT
);
156 int len
= snprintf(buf
, sizeof(buf
), "%i\n", getpid());
162 script_call("started");
164 while (do_signal
!= SIGTERM
) { // Main logic
165 odhcp6c_clear_state(STATE_SERVER_ID
);
166 odhcp6c_clear_state(STATE_SERVER_CAND
);
167 odhcp6c_clear_state(STATE_IA_PD
);
168 odhcp6c_clear_state(STATE_SNTP_IP
);
169 odhcp6c_clear_state(STATE_SNTP_FQDN
);
170 odhcp6c_clear_state(STATE_SIP_IP
);
171 odhcp6c_clear_state(STATE_SIP_FQDN
);
172 dhcpv6_set_ia_na_mode(ia_na_mode
);
175 int res
= dhcpv6_request(DHCPV6_MSG_SOLICIT
);
178 continue; // Might happen if we got a signal
179 } else if (res
== DHCPV6_STATELESS
) { // Stateless mode
180 while (do_signal
== 0 || do_signal
== SIGUSR1
) {
183 res
= dhcpv6_request(DHCPV6_MSG_INFO_REQ
);
184 if (do_signal
== SIGUSR1
)
189 script_call("informed");
191 if (dhcpv6_poll_reconfigure() > 0)
192 script_call("informed");
199 if (dhcpv6_request(DHCPV6_MSG_REQUEST
) < 0)
202 script_call("bound");
204 while (do_signal
== 0 || do_signal
== SIGUSR1
) {
206 // Wait for T1 to expire or until we get a reconfigure
207 int res
= dhcpv6_poll_reconfigure();
210 script_call("updated");
215 // Handle signal, if necessary
216 if (do_signal
== SIGUSR1
)
217 do_signal
= 0; // Acknowledged
218 else if (do_signal
> 0)
219 break; // Other signal type
221 size_t ia_pd_len
, ia_na_len
, ia_pd_new
, ia_na_new
;
222 odhcp6c_get_state(STATE_IA_PD
, &ia_pd_len
);
223 odhcp6c_get_state(STATE_IA_NA
, &ia_na_len
);
225 // If we have any IAs, send renew, otherwise request
227 if (ia_pd_len
== 0 && ia_na_len
== 0)
228 r
= dhcpv6_request(DHCPV6_MSG_REQUEST
);
230 r
= dhcpv6_request(DHCPV6_MSG_RENEW
);
231 if (r
> 0) // Publish updates
232 script_call("updated");
234 continue; // Renew was successful
236 odhcp6c_clear_state(STATE_SERVER_ID
); // Remove binding
238 // If we have IAs, try rebind otherwise restart
239 res
= dhcpv6_request(DHCPV6_MSG_REBIND
);
241 odhcp6c_get_state(STATE_IA_PD
, &ia_pd_new
);
242 odhcp6c_get_state(STATE_IA_NA
, &ia_na_new
);
243 if (res
< 0 || (ia_pd_new
== 0 && ia_pd_len
) ||
244 (ia_na_new
== 0 && ia_na_len
))
245 break; // We lost all our IAs, restart
247 script_call("rebound");
251 size_t ia_pd_len
, ia_na_len
, server_id_len
;
252 odhcp6c_get_state(STATE_IA_PD
, &ia_pd_len
);
253 odhcp6c_get_state(STATE_IA_NA
, &ia_na_len
);
254 odhcp6c_get_state(STATE_SERVER_ID
, &server_id_len
);
256 // Add all prefixes to lost prefixes
257 odhcp6c_clear_state(STATE_IA_PD
);
258 script_call("unbound");
260 // Remove assigned addresses
262 dhcpv6_remove_addrs();
264 if (server_id_len
> 0 && (ia_pd_len
> 0 || ia_na_len
> 0))
265 dhcpv6_request(DHCPV6_MSG_RELEASE
);
268 script_call("stopped");
273 static int usage(void)
276 "Usage: odhcp6c [options] <interface>\n"
277 "\nFeature options:\n"
278 " -N <mode> Mode for requesting addresses [try|force|none]\n"
279 " -P <length> Request IPv6-Prefix (0 = auto)\n"
280 " -c <clientid> Override client-ID (base-16 encoded)\n"
281 " -r <options> Options to be requested (comma-separated)\n"
282 " -s <script> Status update script (/usr/sbin/odhcp6c-update)\n"
283 "\nInvocation options:\n"
284 " -p <pidfile> Set pidfile (/var/run/6relayd.pid)\n"
286 //" -v Increase logging verbosity\n"
287 " -h Show this help\n\n";
288 write(STDERR_FILENO
, buf
, sizeof(buf
));
293 // Don't want to pull-in librt and libpthread just for a monotonic clock...
294 uint64_t odhcp6c_get_milli_time(void)
296 struct timespec t
= {0, 0};
297 syscall(SYS_clock_gettime
, CLOCK_MONOTONIC
, &t
);
298 return t
.tv_sec
* 1000 + t
.tv_nsec
/ 1000000;
302 static uint8_t* odhcp6c_resize_state(enum odhcp6c_state state
, ssize_t len
)
305 return state_data
[state
] + state_len
[state
];
307 uint8_t *n
= realloc(state_data
[state
], state_len
[state
] + len
);
308 if (n
|| state_len
[state
] + len
== 0) {
309 state_data
[state
] = n
;
310 n
+= state_len
[state
];
311 state_len
[state
] += len
;
317 bool odhcp6c_signal_is_pending(void)
319 return do_signal
!= 0;
323 void odhcp6c_clear_state(enum odhcp6c_state state
)
325 state_len
[state
] = 0;
329 void odhcp6c_add_state(enum odhcp6c_state state
, const void *data
, size_t len
)
331 uint8_t *n
= odhcp6c_resize_state(state
, len
);
333 memcpy(n
, data
, len
);
337 size_t odhcp6c_remove_state(enum odhcp6c_state state
, size_t offset
, size_t len
)
339 uint8_t *data
= state_data
[state
];
340 ssize_t len_after
= state_len
[state
] - (offset
+ len
);
342 return state_len
[state
];
344 memmove(data
+ offset
, data
+ offset
+ len
, len_after
);
345 return state_len
[state
] -= len
;
349 bool odhcp6c_commit_state(enum odhcp6c_state state
, size_t old_len
)
351 size_t new_len
= state_len
[state
] - old_len
;
352 uint8_t *old_data
= state_data
[state
], *new_data
= old_data
+ old_len
;
353 bool upd
= new_len
!= old_len
|| memcmp(old_data
, new_data
, new_len
);
355 memmove(old_data
, new_data
, new_len
);
356 odhcp6c_resize_state(state
, -old_len
);
362 void* odhcp6c_get_state(enum odhcp6c_state state
, size_t *len
)
364 *len
= state_len
[state
];
365 return state_data
[state
];
369 static void sighandler(int signal
)
371 if (signal
== SIGCHLD
)
372 while (waitpid(-1, NULL
, WNOHANG
) > 0);
373 else if (signal
== SIGUSR1
)
375 else if (signal
== SIGUSR2
)