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dhcpv6: rework option passthrough logic
[project/odhcp6c.git] / src / odhcp6c.c
1 /**
2 * Copyright (C) 2012-2014 Steven Barth <steven@midlink.org>
3 * Copyright (C) 2017-2018 Hans Dedecker <dedeckeh@gmail.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License v2 as published by
7 * the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 */
15
16 #include <time.h>
17 #include <errno.h>
18 #include <ctype.h>
19 #include <fcntl.h>
20 #include <limits.h>
21 #include <resolv.h>
22 #include <stdio.h>
23 #include <stdlib.h>
24 #include <stddef.h>
25 #include <unistd.h>
26 #include <syslog.h>
27 #include <signal.h>
28 #include <string.h>
29 #include <strings.h>
30 #include <stdbool.h>
31
32 #include <net/if.h>
33 #include <sys/syscall.h>
34 #include <arpa/inet.h>
35 #include <linux/if_addr.h>
36
37 #include "odhcp6c.h"
38 #include "ra.h"
39
40 #ifndef IN6_IS_ADDR_UNIQUELOCAL
41 #define IN6_IS_ADDR_UNIQUELOCAL(a) \
42 ((((__const uint32_t *) (a))[0] & htonl (0xfe000000)) \
43 == htonl (0xfc000000))
44 #endif
45 #define ARRAY_SEP " ,\t"
46
47 static void sighandler(int signal);
48 static int usage(void);
49 static int add_opt(const uint16_t code, const uint8_t *data,
50 const uint16_t len);
51 static int parse_opt_data(const char *data, uint8_t **dst,
52 const unsigned int type, const bool array);
53 static int parse_opt(const char *opt);
54
55 static uint8_t *state_data[_STATE_MAX] = {NULL};
56 static size_t state_len[_STATE_MAX] = {0};
57
58 static volatile bool signal_io = false;
59 static volatile bool signal_usr1 = false;
60 static volatile bool signal_usr2 = false;
61 static volatile bool signal_term = false;
62
63 static int urandom_fd = -1, allow_slaac_only = 0;
64 static bool bound = false, release = true, ra = false;
65 static time_t last_update = 0;
66 static char *ifname = NULL;
67
68 static unsigned int script_sync_delay = 10;
69 static unsigned int script_accu_delay = 1;
70
71 static struct odhcp6c_opt opts[] = {
72 { .code = DHCPV6_OPT_CLIENTID, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
73 { .code = DHCPV6_OPT_SERVERID, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
74 { .code = DHCPV6_OPT_IA_NA, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str= NULL },
75 { .code = DHCPV6_OPT_IA_TA, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
76 { .code = DHCPV6_OPT_IA_ADDR, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
77 { .code = DHCPV6_OPT_ORO, .flags = OPT_INTERNAL, .str = NULL },
78 { .code = DHCPV6_OPT_PREF, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
79 { .code = DHCPV6_OPT_ELAPSED, .flags = OPT_INTERNAL, .str = NULL },
80 { .code = DHCPV6_OPT_RELAY_MSG, .flags = OPT_INTERNAL, .str = NULL },
81 { .code = DHCPV6_OPT_AUTH, .flags = OPT_U8 | OPT_NO_PASSTHRU, .str = "authentication" },
82 { .code = DHCPV6_OPT_UNICAST, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
83 { .code = DHCPV6_OPT_STATUS, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
84 { .code = DHCPV6_OPT_RAPID_COMMIT, .flags = OPT_INTERNAL, .str = NULL },
85 { .code = DHCPV6_OPT_USER_CLASS, .flags = OPT_USER_CLASS | OPT_ARRAY, .str = "userclass" },
86 { .code = DHCPV6_OPT_VENDOR_CLASS, .flags = OPT_U8, .str = "vendorclass" },
87 { .code = DHCPV6_OPT_INTERFACE_ID, .flags = OPT_INTERNAL, .str = NULL },
88 { .code = DHCPV6_OPT_RECONF_MESSAGE, .flags = OPT_INTERNAL, .str = NULL },
89 { .code = DHCPV6_OPT_RECONF_ACCEPT, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
90 { .code = DHCPV6_OPT_DNS_SERVERS, .flags = OPT_IP6 | OPT_ARRAY, .str = "dns" },
91 { .code = DHCPV6_OPT_DNS_DOMAIN, .flags = OPT_DNS_STR, .str = "search" },
92 { .code = DHCPV6_OPT_IA_PD, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
93 { .code = DHCPV6_OPT_IA_PREFIX, .flags = OPT_INTERNAL, .str = NULL },
94 { .code = DHCPV6_OPT_SNTP_SERVERS, .flags = OPT_IP6 | OPT_ARRAY, .str = "sntpservers" },
95 { .code = DHCPV6_OPT_INFO_REFRESH, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
96 { .code = DHCPV6_OPT_FQDN, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
97 { .code = DHCPV6_OPT_NTP_SERVER, .flags = OPT_U8, .str = "ntpserver" },
98 { .code = DHCPV6_OPT_SIP_SERVER_D, .flags = OPT_DNS_STR, .str = "sipserver_d" },
99 { .code = DHCPV6_OPT_SIP_SERVER_A, .flags = OPT_IP6 | OPT_ARRAY, .str = "sipserver_a" },
100 { .code = DHCPV6_OPT_AFTR_NAME, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
101 { .code = DHCPV6_OPT_PD_EXCLUDE, .flags = OPT_INTERNAL, .str = NULL },
102 { .code = DHCPV6_OPT_SOL_MAX_RT, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
103 { .code = DHCPV6_OPT_INF_MAX_RT, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
104 #ifdef EXT_CER_ID
105 { .code = DHCPV6_OPT_CER_ID, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
106 #endif
107 { .code = DHCPV6_OPT_S46_RULE, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
108 { .code = DHCPV6_OPT_S46_BR, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
109 { .code = DHCPV6_OPT_S46_DMR, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
110 { .code = DHCPV6_OPT_S46_V4V6BIND, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
111 { .code = DHCPV6_OPT_S46_PORTPARAMS, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
112 { .code = DHCPV6_OPT_S46_CONT_MAPE, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
113 { .code = DHCPV6_OPT_S46_CONT_MAPT, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
114 { .code = DHCPV6_OPT_S46_CONT_LW, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
115 { .code = 0, .flags = 0, .str = NULL },
116 };
117
118 int main(_unused int argc, char* const argv[])
119 {
120 static struct in6_addr ifid = IN6ADDR_ANY_INIT;
121 // Allocate resources
122 const char *pidfile = NULL;
123 const char *script = "/usr/sbin/odhcp6c-update";
124 ssize_t l;
125 uint8_t buf[134], *o_data;
126 char *optpos;
127 uint16_t opttype;
128 enum odhcp6c_ia_mode ia_na_mode = IA_MODE_TRY;
129 enum odhcp6c_ia_mode ia_pd_mode = IA_MODE_NONE;
130 struct odhcp6c_opt *opt;
131 int ia_pd_iaid_index = 0;
132 int sol_timeout = DHCPV6_SOL_MAX_RT;
133 int verbosity = 0;
134 bool help = false, daemonize = false;
135 int logopt = LOG_PID;
136 int c, res;
137 unsigned int client_options = DHCPV6_CLIENT_FQDN | DHCPV6_ACCEPT_RECONFIGURE;
138 unsigned int ra_options = RA_RDNSS_DEFAULT_LIFETIME;
139 unsigned int ra_holdoff_interval = RA_MIN_ADV_INTERVAL;
140
141 while ((c = getopt(argc, argv, "S::N:V:P:FB:c:i:r:Ru:x:s:kt:m:Lhedp:fav")) != -1) {
142 switch (c) {
143 case 'S':
144 allow_slaac_only = (optarg) ? atoi(optarg) : -1;
145 break;
146
147 case 'N':
148 if (!strcmp(optarg, "force")) {
149 ia_na_mode = IA_MODE_FORCE;
150 allow_slaac_only = -1;
151 } else if (!strcmp(optarg, "none"))
152 ia_na_mode = IA_MODE_NONE;
153 else if (!strcmp(optarg, "try"))
154 ia_na_mode = IA_MODE_TRY;
155 else
156 help = true;
157 break;
158
159 case 'V':
160 opt = odhcp6c_find_opt(DHCPV6_OPT_VENDOR_CLASS);
161 if (!opt) {
162 syslog(LOG_ERR, "Failed to set vendor-class option");
163 return 1;
164 }
165
166 o_data = NULL;
167 res = parse_opt_data(optarg, &o_data, opt->flags & OPT_MASK_SIZE,
168 (opt->flags & OPT_ARRAY) == OPT_ARRAY);
169 if (res > 0) {
170 res = add_opt(opt->code, o_data, res);
171 if (res) {
172 if (res > 0)
173 return 1;
174
175 help = true;
176 }
177 } else
178 help = true;
179
180 free(o_data);
181 break;
182
183 case 'P':
184 if (ia_pd_mode == IA_MODE_NONE)
185 ia_pd_mode = IA_MODE_TRY;
186
187 if (allow_slaac_only >= 0 && allow_slaac_only < 10)
188 allow_slaac_only = 10;
189
190 char *iaid_begin;
191 int iaid_len = 0;
192 int prefix_length = strtoul(optarg, &iaid_begin, 10);
193
194 if (*iaid_begin != '\0' && *iaid_begin != ',' && *iaid_begin != ':') {
195 syslog(LOG_ERR, "invalid argument: '%s'", optarg);
196 return 1;
197 }
198
199 struct odhcp6c_request_prefix prefix = { 0, prefix_length };
200
201 if (*iaid_begin == ',' && (iaid_len = strlen(iaid_begin)) > 1)
202 memcpy(&prefix.iaid, iaid_begin + 1, iaid_len > 4 ? 4 : iaid_len);
203 else if (*iaid_begin == ':')
204 prefix.iaid = htonl((uint32_t)strtoul(&iaid_begin[1], NULL, 16));
205 else
206 prefix.iaid = htonl(++ia_pd_iaid_index);
207
208 if (odhcp6c_add_state(STATE_IA_PD_INIT, &prefix, sizeof(prefix))) {
209 syslog(LOG_ERR, "Failed to set request IPv6-Prefix");
210 return 1;
211 }
212 break;
213
214 case 'F':
215 allow_slaac_only = -1;
216 ia_pd_mode = IA_MODE_FORCE;
217 break;
218
219 case 'c':
220 l = script_unhexlify(&buf[4], sizeof(buf) - 4, optarg);
221 if (l > 0) {
222 buf[0] = 0;
223 buf[1] = DHCPV6_OPT_CLIENTID;
224 buf[2] = 0;
225 buf[3] = l;
226 if (odhcp6c_add_state(STATE_CLIENT_ID, buf, l + 4)) {
227 syslog(LOG_ERR, "Failed to override client-ID");
228 return 1;
229 }
230 } else
231 help = true;
232 break;
233
234 case 'i':
235 if (inet_pton(AF_INET6, optarg, &ifid) != 1)
236 help = true;
237 break;
238
239 case 'r':
240 optpos = optarg;
241 while (optpos[0]) {
242 opttype = htons(strtoul(optarg, &optpos, 10));
243 if (optpos == optarg)
244 break;
245 else if (optpos[0])
246 optarg = &optpos[1];
247
248 if (odhcp6c_add_state(STATE_ORO, &opttype, 2)) {
249 syslog(LOG_ERR, "Failed to add requested option");
250 return 1;
251 }
252 }
253 break;
254
255 case 'R':
256 client_options |= DHCPV6_STRICT_OPTIONS;
257 break;
258
259 case 'u':
260 opt = odhcp6c_find_opt(DHCPV6_OPT_USER_CLASS);
261 if (!opt) {
262 syslog(LOG_ERR, "Failed to set user-class option");
263 return 1;
264 }
265
266 o_data = NULL;
267 res = parse_opt_data(optarg, &o_data, opt->flags & OPT_MASK_SIZE,
268 (opt->flags & OPT_ARRAY) == OPT_ARRAY);
269 if (res > 0) {
270 res = add_opt(opt->code, o_data, res);
271 if (res) {
272 if (res > 0)
273 return 1;
274
275 help = true;
276 }
277 } else
278 help = true;
279
280 free(o_data);
281 break;
282
283 case 's':
284 script = optarg;
285 break;
286
287 case 'k':
288 release = false;
289 break;
290
291 case 't':
292 sol_timeout = atoi(optarg);
293 break;
294
295 case 'm':
296 ra_holdoff_interval = atoi(optarg);
297 break;
298
299 case 'L':
300 ra_options &= ~RA_RDNSS_DEFAULT_LIFETIME;
301 break;
302
303 case 'e':
304 logopt |= LOG_PERROR;
305 break;
306
307 case 'd':
308 daemonize = true;
309 break;
310
311 case 'p':
312 pidfile = optarg;
313 break;
314
315 case 'f':
316 client_options &= ~DHCPV6_CLIENT_FQDN;
317 break;
318
319 case 'a':
320 client_options &= ~DHCPV6_ACCEPT_RECONFIGURE;
321 break;
322
323 case 'v':
324 ++verbosity;
325 break;
326
327 case 'x':
328 res = parse_opt(optarg);
329 if (res) {
330 if (res > 0)
331 return res;
332
333 help = true;
334 }
335 break;
336
337 default:
338 help = true;
339 break;
340 }
341 }
342
343 if (allow_slaac_only > 0)
344 script_sync_delay = allow_slaac_only;
345
346 openlog("odhcp6c", logopt, LOG_DAEMON);
347 if (!verbosity)
348 setlogmask(LOG_UPTO(LOG_WARNING));
349
350 ifname = argv[optind];
351
352 if (help || !ifname)
353 return usage();
354
355 signal(SIGIO, sighandler);
356 signal(SIGHUP, sighandler);
357 signal(SIGINT, sighandler);
358 signal(SIGTERM, sighandler);
359 signal(SIGUSR1, sighandler);
360 signal(SIGUSR2, sighandler);
361
362 if ((urandom_fd = open("/dev/urandom", O_CLOEXEC | O_RDONLY)) < 0 ||
363 init_dhcpv6(ifname, client_options, sol_timeout) ||
364 ra_init(ifname, &ifid, ra_options, ra_holdoff_interval) ||
365 script_init(script, ifname)) {
366 syslog(LOG_ERR, "failed to initialize: %s", strerror(errno));
367 return 3;
368 }
369
370 if (daemonize) {
371 openlog("odhcp6c", LOG_PID, LOG_DAEMON); // Disable LOG_PERROR
372 if (daemon(0, 0)) {
373 syslog(LOG_ERR, "Failed to daemonize: %s",
374 strerror(errno));
375 return 4;
376 }
377
378 if (!pidfile) {
379 snprintf((char*)buf, sizeof(buf), "/var/run/odhcp6c.%s.pid", ifname);
380 pidfile = (char*)buf;
381 }
382
383 FILE *fp = fopen(pidfile, "w");
384 if (fp) {
385 fprintf(fp, "%i\n", getpid());
386 fclose(fp);
387 }
388 }
389
390 script_call("started", 0, false);
391
392 while (!signal_term) { // Main logic
393 odhcp6c_clear_state(STATE_SERVER_ID);
394 odhcp6c_clear_state(STATE_SERVER_ADDR);
395 odhcp6c_clear_state(STATE_IA_NA);
396 odhcp6c_clear_state(STATE_IA_PD);
397 odhcp6c_clear_state(STATE_SNTP_IP);
398 odhcp6c_clear_state(STATE_NTP_IP);
399 odhcp6c_clear_state(STATE_NTP_FQDN);
400 odhcp6c_clear_state(STATE_SIP_IP);
401 odhcp6c_clear_state(STATE_SIP_FQDN);
402 bound = false;
403
404 syslog(LOG_NOTICE, "(re)starting transaction on %s", ifname);
405
406 signal_usr1 = signal_usr2 = false;
407 int mode = dhcpv6_set_ia_mode(ia_na_mode, ia_pd_mode);
408 if (mode != DHCPV6_STATELESS)
409 mode = dhcpv6_request(DHCPV6_MSG_SOLICIT);
410
411 odhcp6c_signal_process();
412
413 if (mode < 0)
414 continue;
415
416 do {
417 res = dhcpv6_request(mode == DHCPV6_STATELESS ?
418 DHCPV6_MSG_INFO_REQ : DHCPV6_MSG_REQUEST);
419 bool signalled = odhcp6c_signal_process();
420
421 if (res > 0)
422 break;
423 else if (signalled) {
424 mode = -1;
425 break;
426 }
427
428 mode = dhcpv6_promote_server_cand();
429 } while (mode > DHCPV6_UNKNOWN);
430
431 if (mode < 0)
432 continue;
433
434 switch (mode) {
435 case DHCPV6_STATELESS:
436 bound = true;
437 syslog(LOG_NOTICE, "entering stateless-mode on %s", ifname);
438
439 while (!signal_usr2 && !signal_term) {
440 signal_usr1 = false;
441 script_call("informed", script_sync_delay, true);
442
443 res = dhcpv6_poll_reconfigure();
444 odhcp6c_signal_process();
445
446 if (res > 0)
447 continue;
448
449 if (signal_usr1) {
450 signal_usr1 = false; // Acknowledged
451 continue;
452 }
453
454 if (signal_usr2 || signal_term)
455 break;
456
457 res = dhcpv6_request(DHCPV6_MSG_INFO_REQ);
458 odhcp6c_signal_process();
459
460 if (signal_usr1)
461 continue;
462 else if (res < 0)
463 break;
464 }
465 break;
466
467 case DHCPV6_STATEFUL:
468 bound = true;
469 script_call("bound", script_sync_delay, true);
470 syslog(LOG_NOTICE, "entering stateful-mode on %s", ifname);
471
472 while (!signal_usr2 && !signal_term) {
473 // Renew Cycle
474 // Wait for T1 to expire or until we get a reconfigure
475 res = dhcpv6_poll_reconfigure();
476 odhcp6c_signal_process();
477 if (res > 0) {
478 script_call("updated", 0, false);
479 continue;
480 }
481
482 // Handle signal, if necessary
483 if (signal_usr1)
484 signal_usr1 = false; // Acknowledged
485
486 if (signal_usr2 || signal_term)
487 break; // Other signal type
488
489 // Send renew as T1 expired
490 res = dhcpv6_request(DHCPV6_MSG_RENEW);
491 odhcp6c_signal_process();
492
493 if (res > 0) { // Renew was succesfull
494 // Publish updates
495 script_call("updated", 0, false);
496 continue; // Renew was successful
497 }
498
499 odhcp6c_clear_state(STATE_SERVER_ID); // Remove binding
500 odhcp6c_clear_state(STATE_SERVER_ADDR);
501
502 size_t ia_pd_len, ia_na_len;
503 odhcp6c_get_state(STATE_IA_PD, &ia_pd_len);
504 odhcp6c_get_state(STATE_IA_NA, &ia_na_len);
505
506 if (ia_pd_len == 0 && ia_na_len == 0)
507 break;
508
509 // If we have IAs, try rebind otherwise restart
510 res = dhcpv6_request(DHCPV6_MSG_REBIND);
511 odhcp6c_signal_process();
512
513 if (res > 0)
514 script_call("rebound", 0, true);
515 else
516 break;
517 }
518 break;
519
520 default:
521 break;
522 }
523
524 odhcp6c_expire();
525
526 size_t ia_pd_len, ia_na_len, server_id_len;
527 odhcp6c_get_state(STATE_IA_PD, &ia_pd_len);
528 odhcp6c_get_state(STATE_IA_NA, &ia_na_len);
529 odhcp6c_get_state(STATE_SERVER_ID, &server_id_len);
530
531 // Add all prefixes to lost prefixes
532 bound = false;
533 script_call("unbound", 0, true);
534
535 if (server_id_len > 0 && (ia_pd_len > 0 || ia_na_len > 0) && release)
536 dhcpv6_request(DHCPV6_MSG_RELEASE);
537
538 odhcp6c_clear_state(STATE_IA_NA);
539 odhcp6c_clear_state(STATE_IA_PD);
540 }
541
542 script_call("stopped", 0, true);
543
544 return 0;
545 }
546
547 static int usage(void)
548 {
549 const char buf[] =
550 "Usage: odhcp6c [options] <interface>\n"
551 "\nFeature options:\n"
552 " -S <time> Wait at least <time> sec for a DHCP-server (0)\n"
553 " -N <mode> Mode for requesting addresses [try|force|none]\n"
554 " -P <length> Request IPv6-Prefix (0 = auto)\n"
555 " -F Force IPv6-Prefix\n"
556 " -V <class> Set vendor-class option (base-16 encoded)\n"
557 " -u <user-class> Set user-class option string\n"
558 " -x <opt>:<val> Add option opt (with value val) in sent packets (cumulative)\n"
559 " Examples of IPv6 address, string and base-16 encoded options:\n"
560 " -x dns:2001:2001::1,2001:2001::2 - option 23\n"
561 " -x 15:office - option 15 (userclass)\n"
562 " -x 0x1f4:ABBA - option 500\n"
563 " -c <clientid> Override client-ID (base-16 encoded 16-bit type + value)\n"
564 " -i <iface-id> Use a custom interface identifier for RA handling\n"
565 " -r <options> Options to be requested (comma-separated)\n"
566 " -R Do not request any options except those specified with -r\n"
567 " -s <script> Status update script (/usr/sbin/odhcp6c-update)\n"
568 " -a Don't send Accept Reconfigure option\n"
569 " -f Don't send Client FQDN option\n"
570 " -k Don't send a RELEASE when stopping\n"
571 " -t <seconds> Maximum timeout for DHCPv6-SOLICIT (120)\n"
572 " -m <seconds> Minimum time between accepting RA updates (3)\n"
573 " -L Ignore default lifetime for RDNSS records\n"
574 "\nInvocation options:\n"
575 " -p <pidfile> Set pidfile (/var/run/odhcp6c.pid)\n"
576 " -d Daemonize\n"
577 " -e Write logmessages to stderr\n"
578 " -v Increase logging verbosity\n"
579 " -h Show this help\n\n";
580 fputs(buf, stderr);
581
582 return 1;
583 }
584
585 // Don't want to pull-in librt and libpthread just for a monotonic clock...
586 uint64_t odhcp6c_get_milli_time(void)
587 {
588 struct timespec t = {0, 0};
589 syscall(SYS_clock_gettime, CLOCK_MONOTONIC, &t);
590
591 return ((uint64_t)t.tv_sec) * 1000 + ((uint64_t)t.tv_nsec) / 1000000;
592 }
593
594 static uint8_t* odhcp6c_resize_state(enum odhcp6c_state state, ssize_t len)
595 {
596 if (len == 0)
597 return state_data[state] + state_len[state];
598 else if (state_len[state] + len > 1024)
599 return NULL;
600
601 uint8_t *n = realloc(state_data[state], state_len[state] + len);
602
603 if (n || state_len[state] + len == 0) {
604 state_data[state] = n;
605 n += state_len[state];
606 state_len[state] += len;
607 }
608
609 return n;
610 }
611
612 bool odhcp6c_signal_process(void)
613 {
614 while (signal_io) {
615 signal_io = false;
616
617 bool ra_updated = ra_process();
618
619 if (ra_link_up()) {
620 signal_usr2 = true;
621 ra = false;
622 }
623
624 if (ra_updated && (bound || allow_slaac_only >= 0)) {
625 script_call("ra-updated", (!ra && !bound) ?
626 script_sync_delay : script_accu_delay, false);
627 ra = true;
628 }
629 }
630
631 return signal_usr1 || signal_usr2 || signal_term;
632 }
633
634 void odhcp6c_clear_state(enum odhcp6c_state state)
635 {
636 state_len[state] = 0;
637 }
638
639 int odhcp6c_add_state(enum odhcp6c_state state, const void *data, size_t len)
640 {
641 uint8_t *n = odhcp6c_resize_state(state, len);
642
643 if (!n)
644 return -1;
645
646 memcpy(n, data, len);
647
648 return 0;
649 }
650
651 int odhcp6c_insert_state(enum odhcp6c_state state, size_t offset, const void *data, size_t len)
652 {
653 ssize_t len_after = state_len[state] - offset;
654 if (len_after < 0)
655 return -1;
656
657 uint8_t *n = odhcp6c_resize_state(state, len);
658
659 if (n) {
660 uint8_t *sdata = state_data[state];
661
662 memmove(sdata + offset + len, sdata + offset, len_after);
663 memcpy(sdata + offset, data, len);
664 }
665
666 return 0;
667 }
668
669 size_t odhcp6c_remove_state(enum odhcp6c_state state, size_t offset, size_t len)
670 {
671 uint8_t *data = state_data[state];
672 ssize_t len_after = state_len[state] - (offset + len);
673
674 if (len_after < 0)
675 return state_len[state];
676
677 memmove(data + offset, data + offset + len, len_after);
678
679 return state_len[state] -= len;
680 }
681
682 void* odhcp6c_move_state(enum odhcp6c_state state, size_t *len)
683 {
684 *len = state_len[state];
685 void *data = state_data[state];
686
687 state_len[state] = 0;
688 state_data[state] = NULL;
689
690 return data;
691 }
692
693 void* odhcp6c_get_state(enum odhcp6c_state state, size_t *len)
694 {
695 *len = state_len[state];
696
697 return state_data[state];
698 }
699
700 static struct odhcp6c_entry* odhcp6c_find_entry(enum odhcp6c_state state, const struct odhcp6c_entry *new)
701 {
702 size_t len, cmplen = offsetof(struct odhcp6c_entry, target) + ((new->length + 7) / 8);
703 uint8_t *start = odhcp6c_get_state(state, &len);
704
705 for (struct odhcp6c_entry *c = (struct odhcp6c_entry*)start;
706 (uint8_t*)c < &start[len] &&
707 (uint8_t*)odhcp6c_next_entry(c) <= &start[len];
708 c = odhcp6c_next_entry(c)) {
709 if (!memcmp(c, new, cmplen) && !memcmp(c->auxtarget, new->auxtarget, new->auxlen))
710 return c;
711 }
712
713 return NULL;
714 }
715
716 bool odhcp6c_update_entry(enum odhcp6c_state state, struct odhcp6c_entry *new,
717 uint32_t safe, unsigned int holdoff_interval)
718 {
719 size_t len;
720 struct odhcp6c_entry *x = odhcp6c_find_entry(state, new);
721 uint8_t *start = odhcp6c_get_state(state, &len);
722
723 if (x && x->valid > new->valid && new->valid < safe)
724 new->valid = safe;
725
726 if (new->valid > 0) {
727 if (x) {
728 if (holdoff_interval && new->valid >= x->valid &&
729 new->valid != UINT32_MAX &&
730 new->valid - x->valid < holdoff_interval &&
731 new->preferred >= x->preferred &&
732 new->preferred != UINT32_MAX &&
733 new->preferred - x->preferred < holdoff_interval)
734 return false;
735
736 x->valid = new->valid;
737 x->preferred = new->preferred;
738 x->t1 = new->t1;
739 x->t2 = new->t2;
740 x->iaid = new->iaid;
741 } else if (odhcp6c_add_state(state, new, odhcp6c_entry_size(new)))
742 return false;
743 } else if (x)
744 odhcp6c_remove_state(state, ((uint8_t*)x) - start, odhcp6c_entry_size(x));
745
746 return true;
747 }
748
749 static void odhcp6c_expire_list(enum odhcp6c_state state, uint32_t elapsed)
750 {
751 size_t len;
752 uint8_t *start = odhcp6c_get_state(state, &len);
753
754 for (struct odhcp6c_entry *c = (struct odhcp6c_entry*)start;
755 (uint8_t*)c < &start[len] &&
756 (uint8_t*)odhcp6c_next_entry(c) <= &start[len];
757 ) {
758 if (c->t1 < elapsed)
759 c->t1 = 0;
760 else if (c->t1 != UINT32_MAX)
761 c->t1 -= elapsed;
762
763 if (c->t2 < elapsed)
764 c->t2 = 0;
765 else if (c->t2 != UINT32_MAX)
766 c->t2 -= elapsed;
767
768 if (c->preferred < elapsed)
769 c->preferred = 0;
770 else if (c->preferred != UINT32_MAX)
771 c->preferred -= elapsed;
772
773 if (c->valid < elapsed)
774 c->valid = 0;
775 else if (c->valid != UINT32_MAX)
776 c->valid -= elapsed;
777
778 if (!c->valid) {
779 odhcp6c_remove_state(state, ((uint8_t*)c) - start, odhcp6c_entry_size(c));
780 start = odhcp6c_get_state(state, &len);
781 } else
782 c = odhcp6c_next_entry(c);
783 }
784 }
785
786 static uint8_t *odhcp6c_state_find_opt(const uint16_t code)
787 {
788 size_t opts_len;
789 uint8_t *odata, *opts = odhcp6c_get_state(STATE_OPTS, &opts_len);
790 uint16_t otype, olen;
791
792 dhcpv6_for_each_option(opts, &opts[opts_len], otype, olen, odata) {
793 if (otype == code)
794 return &odata[-4];
795 }
796
797 return NULL;
798 }
799
800 void odhcp6c_expire(void)
801 {
802 time_t now = odhcp6c_get_milli_time() / 1000;
803 uint32_t elapsed = (last_update > 0) ? now - last_update : 0;
804
805 last_update = now;
806
807 odhcp6c_expire_list(STATE_RA_PREFIX, elapsed);
808 odhcp6c_expire_list(STATE_RA_ROUTE, elapsed);
809 odhcp6c_expire_list(STATE_RA_DNS, elapsed);
810 odhcp6c_expire_list(STATE_RA_SEARCH, elapsed);
811 odhcp6c_expire_list(STATE_IA_NA, elapsed);
812 odhcp6c_expire_list(STATE_IA_PD, elapsed);
813 }
814
815 uint32_t odhcp6c_elapsed(void)
816 {
817 return odhcp6c_get_milli_time() / 1000 - last_update;
818 }
819
820 int odhcp6c_random(void *buf, size_t len)
821 {
822 return read(urandom_fd, buf, len);
823 }
824
825 bool odhcp6c_is_bound(void)
826 {
827 return bound;
828 }
829
830 bool odhcp6c_addr_in_scope(const struct in6_addr *addr)
831 {
832 FILE *fd = fopen("/proc/net/if_inet6", "r");
833 int len;
834 char buf[256];
835
836 if (fd == NULL)
837 return false;
838
839 while (fgets(buf, sizeof(buf), fd)) {
840 struct in6_addr inet6_addr;
841 uint32_t flags, dummy;
842 unsigned int i;
843 char name[IF_NAMESIZE], addr_buf[33];
844
845 len = strlen(buf);
846
847 if ((len <= 0) || buf[len - 1] != '\n')
848 return false;
849
850 buf[--len] = '\0';
851
852 if (sscanf(buf, "%s %x %x %x %x %s",
853 addr_buf, &dummy, &dummy, &dummy, &flags, name) != 6)
854 return false;
855
856 if (strcmp(name, ifname) ||
857 (flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE | IFA_F_DEPRECATED)))
858 continue;
859
860 for (i = 0; i < strlen(addr_buf); i++) {
861 if (!isxdigit(addr_buf[i]) || isupper(addr_buf[i]))
862 return false;
863 }
864
865 memset(&inet6_addr, 0, sizeof(inet6_addr));
866 for (i = 0; i < (strlen(addr_buf) / 2); i++) {
867 unsigned char byte;
868 static const char hex[] = "0123456789abcdef";
869 byte = ((index(hex, addr_buf[i * 2]) - hex) << 4) |
870 (index(hex, addr_buf[i * 2 + 1]) - hex);
871 inet6_addr.s6_addr[i] = byte;
872 }
873
874 if ((IN6_IS_ADDR_LINKLOCAL(&inet6_addr) == IN6_IS_ADDR_LINKLOCAL(addr)) &&
875 (IN6_IS_ADDR_UNIQUELOCAL(&inet6_addr) == IN6_IS_ADDR_UNIQUELOCAL(addr)))
876 return true;
877 }
878
879 return false;
880 }
881
882 static void sighandler(int signal)
883 {
884 if (signal == SIGUSR1)
885 signal_usr1 = true;
886 else if (signal == SIGUSR2)
887 signal_usr2 = true;
888 else if (signal == SIGIO)
889 signal_io = true;
890 else
891 signal_term = true;
892 }
893
894 static int add_opt(const uint16_t code, const uint8_t *data, const uint16_t len)
895 {
896 struct {
897 uint16_t code;
898 uint16_t len;
899 } opt_hdr = { htons(code), htons(len) };
900
901 if (odhcp6c_state_find_opt(code))
902 return -1;
903
904 if (odhcp6c_add_state(STATE_OPTS, &opt_hdr, sizeof(opt_hdr)) ||
905 odhcp6c_add_state(STATE_OPTS, data, len)) {
906 syslog(LOG_ERR, "Failed to add option %hu", code);
907 return 1;
908 }
909
910 return 0;
911 }
912
913 struct odhcp6c_opt *odhcp6c_find_opt(const uint16_t code)
914 {
915 struct odhcp6c_opt *opt = opts;
916
917 while (opt->code) {
918 if (opt->code == code)
919 return opt;
920
921 opt++;
922 }
923
924 return NULL;
925 }
926
927 static struct odhcp6c_opt *odhcp6c_find_opt_by_name(const char *name)
928 {
929 struct odhcp6c_opt *opt = opts;
930
931 if (!name || !strlen(name))
932 return NULL;
933
934 while (opt->code && (!opt->str || strcmp(opt->str, name)))
935 opt++;
936
937 return (opt->code > 0 ? opt : NULL);
938 }
939
940 /* Find first occurrence of any character in the string <needles>
941 * within the string <haystack>
942 * */
943 static char *get_sep_pos(const char *haystack, const char *needles)
944 {
945 unsigned int i;
946 char *first = NULL;
947
948 for (i = 0; i < strlen(needles); i++) {
949 char *found = strchr(haystack, needles[i]);
950 if (found && ((found < first) || (first == NULL)))
951 first = found;
952 }
953
954 return first;
955 }
956
957 static int parse_opt_u8(const char *src, uint8_t **dst)
958 {
959 int len = strlen(src);
960
961 *dst = realloc(*dst, len/2);
962 if (!*dst)
963 return -1;
964
965 return script_unhexlify(*dst, len, src);
966 }
967
968 static int parse_opt_dns_string(const char *src, uint8_t **dst, const bool array)
969 {
970 int i_len = strlen(src);
971 int o_len = 0;
972 char *sep = get_sep_pos(src, ARRAY_SEP);
973
974 if (sep && !array)
975 return -1;
976
977 do {
978 uint8_t tmp[256];
979
980 if (sep) {
981 *sep = 0;
982 sep++;
983 }
984
985 int len = dn_comp(src, tmp, sizeof(tmp), NULL, NULL);
986 if (len < 0)
987 return -1;
988
989 *dst = realloc(*dst, o_len + len);
990 if (!*dst)
991 return -1;
992
993 memcpy(&((*dst)[o_len]), tmp, len);
994
995 o_len += len;
996 i_len -= strlen(src) + (sep ? 1 : 0);
997 src = sep;
998
999 if (src)
1000 sep = get_sep_pos(src, ARRAY_SEP);
1001 } while (i_len);
1002
1003 return o_len;
1004 }
1005
1006 static int parse_opt_ip6(const char *src, uint8_t **dst, const bool array)
1007 {
1008 int i_len = strlen(src);
1009 int o_len = 0;
1010 char *sep = get_sep_pos(src, ARRAY_SEP);
1011
1012 if (sep && !array)
1013 return -1;
1014
1015 do {
1016 int len = sizeof(struct in6_addr);
1017
1018 if (sep) {
1019 *sep = 0;
1020 sep++;
1021 }
1022
1023 *dst = realloc(*dst, o_len + len);
1024 if (!*dst)
1025 return -1;
1026
1027 if (inet_pton(AF_INET6, src, &((*dst)[o_len])) < 1)
1028 return -1;
1029
1030 o_len += len;
1031 i_len -= strlen(src) + (sep ? 1 : 0);
1032 src = sep;
1033
1034 if (src)
1035 sep = get_sep_pos(src, ARRAY_SEP);
1036 } while (i_len);
1037
1038 return o_len;
1039 }
1040
1041 static int parse_opt_user_class(const char *src, uint8_t **dst, const bool array)
1042 {
1043 int i_len = strlen(src);
1044 int o_len = 0;
1045 char *sep = get_sep_pos(src, ARRAY_SEP);
1046
1047 if (sep && !array)
1048 return -1;
1049
1050 do {
1051 if (sep) {
1052 *sep = 0;
1053 sep++;
1054 }
1055 uint16_t str_len = strlen(src);
1056
1057 *dst = realloc(*dst, o_len + str_len + 2);
1058 if (!*dst)
1059 return -1;
1060
1061 struct user_class {
1062 uint16_t len;
1063 uint8_t data[];
1064 } *e = (struct user_class *)&((*dst)[o_len]);
1065
1066 e->len = ntohs(str_len);
1067 memcpy(e->data, src, str_len);
1068
1069 o_len += str_len + 2;
1070 i_len -= str_len + (sep ? 1 : 0);
1071 src = sep;
1072
1073 if (src)
1074 sep = get_sep_pos(src, ARRAY_SEP);
1075 } while (i_len);
1076
1077 return o_len;
1078 }
1079
1080 static int parse_opt_data(const char *data, uint8_t **dst, const unsigned int type,
1081 const bool array)
1082 {
1083 int ret = 0;
1084
1085 switch (type) {
1086 case OPT_U8:
1087 ret = parse_opt_u8(data, dst);
1088 break;
1089
1090 case OPT_DNS_STR:
1091 ret = parse_opt_dns_string(data, dst, array);
1092 break;
1093
1094 case OPT_IP6:
1095 ret = parse_opt_ip6(data, dst, array);
1096 break;
1097
1098 case OPT_USER_CLASS:
1099 ret = parse_opt_user_class(data, dst,array);
1100 break;
1101
1102 default:
1103 ret = -1;
1104 break;
1105 }
1106
1107 return ret;
1108 }
1109
1110 static int parse_opt(const char *opt)
1111 {
1112 uint32_t optn;
1113 char *data;
1114 uint8_t *payload = NULL;
1115 int payload_len;
1116 unsigned int type = OPT_U8;
1117 bool array = false;
1118 struct odhcp6c_opt *dopt = NULL;
1119 int ret = -1;
1120
1121 data = get_sep_pos(opt, ":");
1122 if (!data)
1123 return -1;
1124
1125 *data = '\0';
1126 data++;
1127
1128 if (strlen(opt) == 0 || strlen(data) == 0)
1129 return -1;
1130
1131 dopt = odhcp6c_find_opt_by_name(opt);
1132 if (!dopt) {
1133 char *e;
1134 optn = strtoul(opt, &e, 0);
1135 if (*e || e == opt || optn > USHRT_MAX)
1136 return -1;
1137
1138 dopt = odhcp6c_find_opt(optn);
1139 } else
1140 optn = dopt->code;
1141
1142 /* Check if the type for the content is well-known */
1143 if (dopt) {
1144 /* Refuse internal options */
1145 if (dopt->flags & OPT_INTERNAL)
1146 return -1;
1147
1148 type = dopt->flags & OPT_MASK_SIZE;
1149 array = ((dopt->flags & OPT_ARRAY) == OPT_ARRAY) ? true : false;
1150 }
1151
1152 payload_len = parse_opt_data(data, &payload, type, array);
1153 if (payload_len > 0)
1154 ret = add_opt(optn, payload, payload_len);
1155
1156 free(payload);
1157
1158 return ret;
1159 }
Openwrt DHCPv6 Client