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[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_SIP_SERVER_D, .flags = OPT_DNS_STR | OPT_ORO, .str = "sipserver_d" },
91 { .code = DHCPV6_OPT_SIP_SERVER_A, .flags = OPT_IP6 | OPT_ARRAY | OPT_ORO, .str = "sipserver_a" },
92 { .code = DHCPV6_OPT_DNS_SERVERS, .flags = OPT_IP6 | OPT_ARRAY | OPT_ORO, .str = "dns" },
93 { .code = DHCPV6_OPT_DNS_DOMAIN, .flags = OPT_DNS_STR | OPT_ORO, .str = "search" },
94 { .code = DHCPV6_OPT_IA_PD, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
95 { .code = DHCPV6_OPT_IA_PREFIX, .flags = OPT_INTERNAL, .str = NULL },
96 { .code = DHCPV6_OPT_SNTP_SERVERS, .flags = OPT_IP6 | OPT_ARRAY | OPT_ORO, .str = "sntpservers" },
97 { .code = DHCPV6_OPT_INFO_REFRESH, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU | OPT_ORO | OPT_ORO_STATELESS, .str = NULL },
98 { .code = DHCPV6_OPT_REMOTE_ID, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
99 { .code = DHCPV6_OPT_SUBSCRIBER_ID, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
100 { .code = DHCPV6_OPT_FQDN, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU | OPT_ORO, .str = NULL },
101 { .code = DHCPV6_OPT_ERO, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
102 { .code = DHCPV6_OPT_LQ_QUERY, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
103 { .code = DHCPV6_OPT_CLIENT_DATA, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
104 { .code = DHCPV6_OPT_CLT_TIME, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
105 { .code = DHCPV6_OPT_LQ_RELAY_DATA, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
106 { .code = DHCPV6_OPT_LQ_CLIENT_LINK, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
107 { .code = DHCPV6_OPT_RELAY_ID, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
108 { .code = DHCPV6_OPT_NTP_SERVER, .flags = OPT_U8 | OPT_ORO, .str = "ntpserver" },
109 { .code = DHCPV6_OPT_CLIENT_ARCH_TYPE, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
110 { .code = DHCPV6_OPT_AFTR_NAME, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU | OPT_ORO, .str = NULL },
111 { .code = DHCPV6_OPT_RSOO, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
112 { .code = DHCPV6_OPT_PD_EXCLUDE, .flags = OPT_INTERNAL | OPT_ORO | OPT_ORO_STATEFUL, .str = NULL },
113 { .code = DHCPV6_OPT_VSS, .flags = OPT_U8, .str = "vss" },
114 { .code = DHCPV6_OPT_LINK_LAYER_ADDRESS, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
115 { .code = DHCPV6_OPT_LINK_ADDRESS, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
116 { .code = DHCPV6_OPT_RADIUS, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
117 { .code = DHCPV6_OPT_SOL_MAX_RT, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU | OPT_ORO | OPT_ORO_SOLICIT, .str = NULL },
118 { .code = DHCPV6_OPT_INF_MAX_RT, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU | OPT_ORO | OPT_ORO_STATELESS, .str = NULL },
119 #ifdef EXT_CER_ID
120 { .code = DHCPV6_OPT_CER_ID, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
121 #endif
122 { .code = DHCPV6_OPT_DHCPV4_MSG, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
123 { .code = DHCPV6_OPT_S46_RULE, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
124 { .code = DHCPV6_OPT_S46_BR, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
125 { .code = DHCPV6_OPT_S46_DMR, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
126 { .code = DHCPV6_OPT_S46_V4V6BIND, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
127 { .code = DHCPV6_OPT_S46_PORTPARAMS, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
128 { .code = DHCPV6_OPT_S46_CONT_MAPE, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU | OPT_ORO, .str = NULL },
129 { .code = DHCPV6_OPT_S46_CONT_MAPT, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU | OPT_ORO, .str = NULL },
130 { .code = DHCPV6_OPT_S46_CONT_LW, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU | OPT_ORO, .str = NULL },
131 { .code = DHCPV6_OPT_LQ_BASE_TIME, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
132 { .code = DHCPV6_OPT_LQ_START_TIME, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
133 { .code = DHCPV6_OPT_LQ_END_TIME, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
134 { .code = DHCPV6_OPT_ANI_ATT, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
135 { .code = DHCPV6_OPT_ANI_NETWORK_NAME, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
136 { .code = DHCPV6_OPT_ANI_AP_NAME, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
137 { .code = DHCPV6_OPT_ANI_AP_BSSID, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
138 { .code = DHCPV6_OPT_ANI_OPERATOR_ID, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
139 { .code = DHCPV6_OPT_ANI_OPERATOR_REALM, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
140 { .code = DHCPV6_OPT_MUD_URL_V6, .flags = OPT_STR | OPT_NO_PASSTHRU, .str = "mud_url_v6" },
141 { .code = DHCPV6_OPT_F_BINDING_STATUS, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
142 { .code = DHCPV6_OPT_F_CONNECT_FLAGS, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
143 { .code = DHCPV6_OPT_F_DNS_REMOVAL_INFO, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
144 { .code = DHCPV6_OPT_F_DNS_HOST_NAME, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
145 { .code = DHCPV6_OPT_F_DNS_ZONE_NAME, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
146 { .code = DHCPV6_OPT_F_DNS_FLAGS, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
147 { .code = DHCPV6_OPT_F_EXPIRATION_TIME, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
148 { .code = DHCPV6_OPT_F_MAX_UNACKED_BNDUPD, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
149 { .code = DHCPV6_OPT_F_MCLT, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
150 { .code = DHCPV6_OPT_F_PARTNER_LIFETIME, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
151 { .code = DHCPV6_OPT_F_PARTNER_LIFETIME_SENT, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
152 { .code = DHCPV6_OPT_F_PARTNER_DOWN_TIME, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
153 { .code = DHCPV6_OPT_F_PARTNER_RAW_CLT_TIME, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
154 { .code = DHCPV6_OPT_F_PROTOCOL_VERSION, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
155 { .code = DHCPV6_OPT_F_KEEPALIVE_TIME, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
156 { .code = DHCPV6_OPT_F_RECONFIGURE_DATA, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
157 { .code = DHCPV6_OPT_F_RELATIONSHIP_NAME, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
158 { .code = DHCPV6_OPT_F_SERVER_FLAGS, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
159 { .code = DHCPV6_OPT_F_SERVER_STATE, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
160 { .code = DHCPV6_OPT_F_START_TIME_OF_STATE, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
161 { .code = DHCPV6_OPT_F_STATE_EXPIRATION_TIME, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
162 { .code = DHCPV6_OPT_RELAY_PORT, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL },
163 { .code = 0, .flags = 0, .str = NULL },
164 };
165
166 int main(_unused int argc, char* const argv[])
167 {
168 static struct in6_addr ifid = IN6ADDR_ANY_INIT;
169 // Allocate resources
170 const char *pidfile = NULL;
171 const char *script = "/usr/sbin/odhcp6c-update";
172 ssize_t l;
173 uint8_t buf[134], *o_data;
174 char *optpos;
175 uint16_t opttype;
176 enum odhcp6c_ia_mode ia_na_mode = IA_MODE_TRY;
177 enum odhcp6c_ia_mode ia_pd_mode = IA_MODE_NONE;
178 bool stateful_only_mode = 0;
179 struct odhcp6c_opt *opt;
180 int ia_pd_iaid_index = 0;
181 int sol_timeout = DHCPV6_SOL_MAX_RT;
182 int verbosity = 0;
183 bool help = false, daemonize = false;
184 int logopt = LOG_PID;
185 int c, res;
186 unsigned int client_options = DHCPV6_CLIENT_FQDN | DHCPV6_ACCEPT_RECONFIGURE;
187 unsigned int ra_options = RA_RDNSS_DEFAULT_LIFETIME;
188 unsigned int ra_holdoff_interval = RA_MIN_ADV_INTERVAL;
189
190 while ((c = getopt(argc, argv, "S::DN:V:P:FB:c:i:r:Ru:Ux:s:kt:m:Lhedp:fav")) != -1) {
191 switch (c) {
192 case 'S':
193 allow_slaac_only = (optarg) ? atoi(optarg) : -1;
194 break;
195
196 case 'D':
197 stateful_only_mode = 1;
198 break;
199
200 case 'N':
201 if (!strcmp(optarg, "force")) {
202 ia_na_mode = IA_MODE_FORCE;
203 allow_slaac_only = -1;
204 } else if (!strcmp(optarg, "none"))
205 ia_na_mode = IA_MODE_NONE;
206 else if (!strcmp(optarg, "try"))
207 ia_na_mode = IA_MODE_TRY;
208 else
209 help = true;
210 break;
211
212 case 'V':
213 opt = odhcp6c_find_opt(DHCPV6_OPT_VENDOR_CLASS);
214 if (!opt) {
215 syslog(LOG_ERR, "Failed to set vendor-class option");
216 return 1;
217 }
218
219 o_data = NULL;
220 res = parse_opt_data(optarg, &o_data, opt->flags & OPT_MASK_SIZE,
221 (opt->flags & OPT_ARRAY) == OPT_ARRAY);
222 if (res > 0) {
223 res = add_opt(opt->code, o_data, res);
224 if (res) {
225 if (res > 0)
226 return 1;
227
228 help = true;
229 }
230 } else
231 help = true;
232
233 free(o_data);
234 break;
235
236 case 'P':
237 if (ia_pd_mode == IA_MODE_NONE)
238 ia_pd_mode = IA_MODE_TRY;
239
240 if (allow_slaac_only >= 0 && allow_slaac_only < 10)
241 allow_slaac_only = 10;
242
243 char *iaid_begin;
244 int iaid_len = 0;
245 int prefix_length = strtoul(optarg, &iaid_begin, 10);
246
247 if (*iaid_begin != '\0' && *iaid_begin != ',' && *iaid_begin != ':') {
248 syslog(LOG_ERR, "invalid argument: '%s'", optarg);
249 return 1;
250 }
251
252 struct odhcp6c_request_prefix prefix = { 0, prefix_length };
253
254 if (*iaid_begin == ',' && (iaid_len = strlen(iaid_begin)) > 1)
255 memcpy(&prefix.iaid, iaid_begin + 1, iaid_len > 4 ? 4 : iaid_len);
256 else if (*iaid_begin == ':')
257 prefix.iaid = htonl((uint32_t)strtoul(&iaid_begin[1], NULL, 16));
258 else
259 prefix.iaid = htonl(++ia_pd_iaid_index);
260
261 if (odhcp6c_add_state(STATE_IA_PD_INIT, &prefix, sizeof(prefix))) {
262 syslog(LOG_ERR, "Failed to set request IPv6-Prefix");
263 return 1;
264 }
265 break;
266
267 case 'F':
268 allow_slaac_only = -1;
269 ia_pd_mode = IA_MODE_FORCE;
270 break;
271
272 case 'c':
273 l = script_unhexlify(&buf[4], sizeof(buf) - 4, optarg);
274 if (l > 0) {
275 buf[0] = 0;
276 buf[1] = DHCPV6_OPT_CLIENTID;
277 buf[2] = 0;
278 buf[3] = l;
279 if (odhcp6c_add_state(STATE_CLIENT_ID, buf, l + 4)) {
280 syslog(LOG_ERR, "Failed to override client-ID");
281 return 1;
282 }
283 } else
284 help = true;
285 break;
286
287 case 'i':
288 if (inet_pton(AF_INET6, optarg, &ifid) != 1)
289 help = true;
290 break;
291
292 case 'r':
293 optpos = optarg;
294 while (optpos[0]) {
295 opttype = htons(strtoul(optarg, &optpos, 10));
296 if (optpos == optarg)
297 break;
298 else if (optpos[0])
299 optarg = &optpos[1];
300
301 if (odhcp6c_add_state(STATE_ORO, &opttype, 2)) {
302 syslog(LOG_ERR, "Failed to add requested option");
303 return 1;
304 }
305 }
306 break;
307
308 case 'R':
309 client_options |= DHCPV6_STRICT_OPTIONS;
310 break;
311
312 case 'u':
313 opt = odhcp6c_find_opt(DHCPV6_OPT_USER_CLASS);
314 if (!opt) {
315 syslog(LOG_ERR, "Failed to set user-class option");
316 return 1;
317 }
318
319 o_data = NULL;
320 res = parse_opt_data(optarg, &o_data, opt->flags & OPT_MASK_SIZE,
321 (opt->flags & OPT_ARRAY) == OPT_ARRAY);
322 if (res > 0) {
323 res = add_opt(opt->code, o_data, res);
324 if (res) {
325 if (res > 0)
326 return 1;
327
328 help = true;
329 }
330 } else
331 help = true;
332
333 free(o_data);
334 break;
335
336 case 'U':
337 client_options |= DHCPV6_IGNORE_OPT_UNICAST;
338 break;
339
340 case 's':
341 script = optarg;
342 break;
343
344 case 'k':
345 release = false;
346 break;
347
348 case 't':
349 sol_timeout = atoi(optarg);
350 break;
351
352 case 'm':
353 ra_holdoff_interval = atoi(optarg);
354 break;
355
356 case 'L':
357 ra_options &= ~RA_RDNSS_DEFAULT_LIFETIME;
358 break;
359
360 case 'e':
361 logopt |= LOG_PERROR;
362 break;
363
364 case 'd':
365 daemonize = true;
366 break;
367
368 case 'p':
369 pidfile = optarg;
370 break;
371
372 case 'f':
373 client_options &= ~DHCPV6_CLIENT_FQDN;
374 break;
375
376 case 'a':
377 client_options &= ~DHCPV6_ACCEPT_RECONFIGURE;
378 break;
379
380 case 'v':
381 ++verbosity;
382 break;
383
384 case 'x':
385 res = parse_opt(optarg);
386 if (res) {
387 if (res > 0)
388 return res;
389
390 help = true;
391 }
392 break;
393
394 default:
395 help = true;
396 break;
397 }
398 }
399
400 if (allow_slaac_only > 0)
401 script_sync_delay = allow_slaac_only;
402
403 openlog("odhcp6c", logopt, LOG_DAEMON);
404 if (!verbosity)
405 setlogmask(LOG_UPTO(LOG_WARNING));
406
407 ifname = argv[optind];
408
409 if (help || !ifname)
410 return usage();
411
412 signal(SIGIO, sighandler);
413 signal(SIGHUP, sighandler);
414 signal(SIGINT, sighandler);
415 signal(SIGTERM, sighandler);
416 signal(SIGUSR1, sighandler);
417 signal(SIGUSR2, sighandler);
418
419 if ((urandom_fd = open("/dev/urandom", O_CLOEXEC | O_RDONLY)) < 0 ||
420 init_dhcpv6(ifname, client_options, sol_timeout) ||
421 ra_init(ifname, &ifid, ra_options, ra_holdoff_interval) ||
422 script_init(script, ifname)) {
423 syslog(LOG_ERR, "failed to initialize: %s", strerror(errno));
424 return 3;
425 }
426
427 if (daemonize) {
428 openlog("odhcp6c", LOG_PID, LOG_DAEMON); // Disable LOG_PERROR
429 if (daemon(0, 0)) {
430 syslog(LOG_ERR, "Failed to daemonize: %s",
431 strerror(errno));
432 return 4;
433 }
434
435 if (!pidfile) {
436 snprintf((char*)buf, sizeof(buf), "/var/run/odhcp6c.%s.pid", ifname);
437 pidfile = (char*)buf;
438 }
439
440 FILE *fp = fopen(pidfile, "w");
441 if (fp) {
442 fprintf(fp, "%i\n", getpid());
443 fclose(fp);
444 }
445 }
446
447 script_call("started", 0, false);
448
449 while (!signal_term) { // Main logic
450 odhcp6c_clear_state(STATE_SERVER_ID);
451 odhcp6c_clear_state(STATE_SERVER_ADDR);
452 odhcp6c_clear_state(STATE_IA_NA);
453 odhcp6c_clear_state(STATE_IA_PD);
454 odhcp6c_clear_state(STATE_SNTP_IP);
455 odhcp6c_clear_state(STATE_NTP_IP);
456 odhcp6c_clear_state(STATE_NTP_FQDN);
457 odhcp6c_clear_state(STATE_SIP_IP);
458 odhcp6c_clear_state(STATE_SIP_FQDN);
459 bound = false;
460
461 syslog(LOG_NOTICE, "(re)starting transaction on %s", ifname);
462
463 signal_usr1 = signal_usr2 = false;
464 int mode = dhcpv6_set_ia_mode(ia_na_mode, ia_pd_mode, stateful_only_mode);
465 if (mode != DHCPV6_STATELESS)
466 mode = dhcpv6_request(DHCPV6_MSG_SOLICIT);
467
468 odhcp6c_signal_process();
469
470 if (mode < 0)
471 continue;
472
473 do {
474 res = dhcpv6_request(mode == DHCPV6_STATELESS ?
475 DHCPV6_MSG_INFO_REQ : DHCPV6_MSG_REQUEST);
476 bool signalled = odhcp6c_signal_process();
477
478 if (res > 0)
479 break;
480 else if (signalled) {
481 mode = -1;
482 break;
483 }
484
485 mode = dhcpv6_promote_server_cand();
486 } while (mode > DHCPV6_UNKNOWN);
487
488 if (mode < 0)
489 continue;
490
491 switch (mode) {
492 case DHCPV6_STATELESS:
493 bound = true;
494 syslog(LOG_NOTICE, "entering stateless-mode on %s", ifname);
495
496 while (!signal_usr2 && !signal_term) {
497 signal_usr1 = false;
498 script_call("informed", script_sync_delay, true);
499
500 res = dhcpv6_poll_reconfigure();
501 odhcp6c_signal_process();
502
503 if (res > 0)
504 continue;
505
506 if (signal_usr1) {
507 signal_usr1 = false; // Acknowledged
508 continue;
509 }
510
511 if (signal_usr2 || signal_term)
512 break;
513
514 res = dhcpv6_request(DHCPV6_MSG_INFO_REQ);
515 odhcp6c_signal_process();
516
517 if (signal_usr1)
518 continue;
519 else if (res < 0)
520 break;
521 }
522 break;
523
524 case DHCPV6_STATEFUL:
525 bound = true;
526 script_call("bound", script_sync_delay, true);
527 syslog(LOG_NOTICE, "entering stateful-mode on %s", ifname);
528
529 while (!signal_usr2 && !signal_term) {
530 // Renew Cycle
531 // Wait for T1 to expire or until we get a reconfigure
532 res = dhcpv6_poll_reconfigure();
533 odhcp6c_signal_process();
534 if (res > 0) {
535 script_call("updated", 0, false);
536 continue;
537 }
538
539 // Handle signal, if necessary
540 if (signal_usr1)
541 signal_usr1 = false; // Acknowledged
542
543 if (signal_usr2 || signal_term)
544 break; // Other signal type
545
546 // Send renew as T1 expired
547 res = dhcpv6_request(DHCPV6_MSG_RENEW);
548 odhcp6c_signal_process();
549
550 if (res > 0) { // Renew was succesfull
551 // Publish updates
552 script_call("updated", 0, false);
553 continue; // Renew was successful
554 }
555
556 odhcp6c_clear_state(STATE_SERVER_ID); // Remove binding
557 odhcp6c_clear_state(STATE_SERVER_ADDR);
558
559 size_t ia_pd_len, ia_na_len;
560 odhcp6c_get_state(STATE_IA_PD, &ia_pd_len);
561 odhcp6c_get_state(STATE_IA_NA, &ia_na_len);
562
563 if (ia_pd_len == 0 && ia_na_len == 0)
564 break;
565
566 // If we have IAs, try rebind otherwise restart
567 res = dhcpv6_request(DHCPV6_MSG_REBIND);
568 odhcp6c_signal_process();
569
570 if (res > 0)
571 script_call("rebound", 0, true);
572 else
573 break;
574 }
575 break;
576
577 default:
578 break;
579 }
580
581 odhcp6c_expire(false);
582
583 size_t ia_pd_len, ia_na_len, server_id_len;
584 odhcp6c_get_state(STATE_IA_PD, &ia_pd_len);
585 odhcp6c_get_state(STATE_IA_NA, &ia_na_len);
586 odhcp6c_get_state(STATE_SERVER_ID, &server_id_len);
587
588 // Add all prefixes to lost prefixes
589 bound = false;
590 script_call("unbound", 0, true);
591
592 if (server_id_len > 0 && (ia_pd_len > 0 || ia_na_len > 0) && release)
593 dhcpv6_request(DHCPV6_MSG_RELEASE);
594
595 odhcp6c_clear_state(STATE_IA_NA);
596 odhcp6c_clear_state(STATE_IA_PD);
597 }
598
599 script_call("stopped", 0, true);
600
601 return 0;
602 }
603
604 static int usage(void)
605 {
606 const char buf[] =
607 "Usage: odhcp6c [options] <interface>\n"
608 "\nFeature options:\n"
609 " -S <time> Wait at least <time> sec for a DHCP-server (0)\n"
610 " -D Discard advertisements without any address or prefix proposed\n"
611 " -N <mode> Mode for requesting addresses [try|force|none]\n"
612 " -P <length> Request IPv6-Prefix (0 = auto)\n"
613 " -F Force IPv6-Prefix\n"
614 " -V <class> Set vendor-class option (base-16 encoded)\n"
615 " -u <user-class> Set user-class option string\n"
616 " -x <opt>:<val> Add option opt (with value val) in sent packets (cumulative)\n"
617 " Examples of IPv6 address, string and base-16 encoded options:\n"
618 " -x dns:2001:2001::1,2001:2001::2 - option 23\n"
619 " -x 15:office - option 15 (userclass)\n"
620 " -x 0x1f4:ABBA - option 500\n"
621 " -x 202:'\"file\"' - option 202\n"
622 " -c <clientid> Override client-ID (base-16 encoded 16-bit type + value)\n"
623 " -i <iface-id> Use a custom interface identifier for RA handling\n"
624 " -r <options> Options to be requested (comma-separated)\n"
625 " -R Do not request any options except those specified with -r\n"
626 " -s <script> Status update script (/usr/sbin/odhcp6c-update)\n"
627 " -a Don't send Accept Reconfigure option\n"
628 " -f Don't send Client FQDN option\n"
629 " -k Don't send a RELEASE when stopping\n"
630 " -t <seconds> Maximum timeout for DHCPv6-SOLICIT (120)\n"
631 " -m <seconds> Minimum time between accepting RA updates (3)\n"
632 " -L Ignore default lifetime for RDNSS records\n"
633 " -U Ignore Server Unicast option\n"
634 "\nInvocation options:\n"
635 " -p <pidfile> Set pidfile (/var/run/odhcp6c.pid)\n"
636 " -d Daemonize\n"
637 " -e Write logmessages to stderr\n"
638 " -v Increase logging verbosity\n"
639 " -h Show this help\n\n";
640 fputs(buf, stderr);
641
642 return 1;
643 }
644
645 // Don't want to pull-in librt and libpthread just for a monotonic clock...
646 uint64_t odhcp6c_get_milli_time(void)
647 {
648 struct timespec t;
649
650 clock_gettime(CLOCK_MONOTONIC, &t);
651
652 return ((uint64_t)t.tv_sec) * 1000 + ((uint64_t)t.tv_nsec) / 1000000;
653 }
654
655 static uint8_t* odhcp6c_resize_state(enum odhcp6c_state state, ssize_t len)
656 {
657 if (len == 0)
658 return state_data[state] + state_len[state];
659 else if (state_len[state] + len > 1024)
660 return NULL;
661
662 uint8_t *n = realloc(state_data[state], state_len[state] + len);
663
664 if (n || state_len[state] + len == 0) {
665 state_data[state] = n;
666 n += state_len[state];
667 state_len[state] += len;
668 }
669
670 return n;
671 }
672
673 bool odhcp6c_signal_process(void)
674 {
675 while (signal_io) {
676 signal_io = false;
677
678 bool ra_updated = ra_process();
679
680 if (ra_link_up()) {
681 signal_usr2 = true;
682 ra = false;
683 }
684
685 if (ra_updated && (bound || allow_slaac_only >= 0)) {
686 script_call("ra-updated", (!ra && !bound) ?
687 script_sync_delay : script_accu_delay, false);
688 ra = true;
689 }
690 }
691
692 return signal_usr1 || signal_usr2 || signal_term;
693 }
694
695 void odhcp6c_clear_state(enum odhcp6c_state state)
696 {
697 state_len[state] = 0;
698 }
699
700 int odhcp6c_add_state(enum odhcp6c_state state, const void *data, size_t len)
701 {
702 uint8_t *n = odhcp6c_resize_state(state, len);
703
704 if (!n)
705 return -1;
706
707 memcpy(n, data, len);
708
709 return 0;
710 }
711
712 int odhcp6c_insert_state(enum odhcp6c_state state, size_t offset, const void *data, size_t len)
713 {
714 ssize_t len_after = state_len[state] - offset;
715 if (len_after < 0)
716 return -1;
717
718 uint8_t *n = odhcp6c_resize_state(state, len);
719
720 if (n) {
721 uint8_t *sdata = state_data[state];
722
723 memmove(sdata + offset + len, sdata + offset, len_after);
724 memcpy(sdata + offset, data, len);
725 }
726
727 return 0;
728 }
729
730 size_t odhcp6c_remove_state(enum odhcp6c_state state, size_t offset, size_t len)
731 {
732 uint8_t *data = state_data[state];
733 ssize_t len_after = state_len[state] - (offset + len);
734
735 if (len_after < 0)
736 return state_len[state];
737
738 memmove(data + offset, data + offset + len, len_after);
739
740 return state_len[state] -= len;
741 }
742
743 void* odhcp6c_move_state(enum odhcp6c_state state, size_t *len)
744 {
745 *len = state_len[state];
746 void *data = state_data[state];
747
748 state_len[state] = 0;
749 state_data[state] = NULL;
750
751 return data;
752 }
753
754 void* odhcp6c_get_state(enum odhcp6c_state state, size_t *len)
755 {
756 *len = state_len[state];
757
758 return state_data[state];
759 }
760
761 static struct odhcp6c_entry* odhcp6c_find_entry(enum odhcp6c_state state, const struct odhcp6c_entry *new)
762 {
763 size_t len, cmplen = offsetof(struct odhcp6c_entry, target) + ((new->length + 7) / 8);
764 uint8_t *start = odhcp6c_get_state(state, &len);
765
766 for (struct odhcp6c_entry *c = (struct odhcp6c_entry*)start;
767 (uint8_t*)c < &start[len] &&
768 (uint8_t*)odhcp6c_next_entry(c) <= &start[len];
769 c = odhcp6c_next_entry(c)) {
770 if (!memcmp(c, new, cmplen) && !memcmp(c->auxtarget, new->auxtarget, new->auxlen))
771 return c;
772 }
773
774 return NULL;
775 }
776
777 bool odhcp6c_update_entry(enum odhcp6c_state state, struct odhcp6c_entry *new,
778 uint32_t safe, unsigned int holdoff_interval)
779 {
780 struct odhcp6c_entry *x = odhcp6c_find_entry(state, new);
781
782 if (x && x->valid > new->valid && new->valid < safe)
783 new->valid = safe;
784
785 if (x) {
786 if (holdoff_interval && new->valid >= x->valid &&
787 new->valid != UINT32_MAX &&
788 new->valid - x->valid < holdoff_interval &&
789 new->preferred >= x->preferred &&
790 new->preferred != UINT32_MAX &&
791 new->preferred - x->preferred < holdoff_interval)
792 return false;
793
794 x->valid = new->valid;
795 x->preferred = new->preferred;
796 x->t1 = new->t1;
797 x->t2 = new->t2;
798 x->iaid = new->iaid;
799 } else if (odhcp6c_add_state(state, new, odhcp6c_entry_size(new)))
800 return false;
801
802 return true;
803 }
804
805 static void odhcp6c_expire_list(enum odhcp6c_state state, uint32_t elapsed, bool remove_expired)
806 {
807 size_t len;
808 uint8_t *start = odhcp6c_get_state(state, &len);
809
810 for (struct odhcp6c_entry *c = (struct odhcp6c_entry*)start;
811 (uint8_t*)c < &start[len] &&
812 (uint8_t*)odhcp6c_next_entry(c) <= &start[len];
813 ) {
814 if (c->t1 < elapsed)
815 c->t1 = 0;
816 else if (c->t1 != UINT32_MAX)
817 c->t1 -= elapsed;
818
819 if (c->t2 < elapsed)
820 c->t2 = 0;
821 else if (c->t2 != UINT32_MAX)
822 c->t2 -= elapsed;
823
824 if (c->preferred < elapsed)
825 c->preferred = 0;
826 else if (c->preferred != UINT32_MAX)
827 c->preferred -= elapsed;
828
829 if (c->valid < elapsed)
830 c->valid = 0;
831 else if (c->valid != UINT32_MAX)
832 c->valid -= elapsed;
833
834 if (!c->valid && remove_expired) {
835 odhcp6c_remove_state(state, ((uint8_t*)c) - start, odhcp6c_entry_size(c));
836 start = odhcp6c_get_state(state, &len);
837 } else
838 c = odhcp6c_next_entry(c);
839 }
840 }
841
842 static uint8_t *odhcp6c_state_find_opt(const uint16_t code)
843 {
844 size_t opts_len;
845 uint8_t *odata, *opts = odhcp6c_get_state(STATE_OPTS, &opts_len);
846 uint16_t otype, olen;
847
848 dhcpv6_for_each_option(opts, &opts[opts_len], otype, olen, odata) {
849 if (otype == code)
850 return &odata[-4];
851 }
852
853 return NULL;
854 }
855
856 void odhcp6c_expire(bool expire_ia_pd)
857 {
858 time_t now = odhcp6c_get_milli_time() / 1000;
859 uint32_t elapsed = (last_update > 0) ? now - last_update : 0;
860
861 last_update = now;
862
863 odhcp6c_expire_list(STATE_RA_PREFIX, elapsed, true);
864 odhcp6c_expire_list(STATE_RA_ROUTE, elapsed, true);
865 odhcp6c_expire_list(STATE_RA_DNS, elapsed, true);
866 odhcp6c_expire_list(STATE_RA_SEARCH, elapsed, true);
867 odhcp6c_expire_list(STATE_IA_NA, elapsed, true);
868 odhcp6c_expire_list(STATE_IA_PD, elapsed, expire_ia_pd);
869 }
870
871 uint32_t odhcp6c_elapsed(void)
872 {
873 return odhcp6c_get_milli_time() / 1000 - last_update;
874 }
875
876 int odhcp6c_random(void *buf, size_t len)
877 {
878 return read(urandom_fd, buf, len);
879 }
880
881 bool odhcp6c_is_bound(void)
882 {
883 return bound;
884 }
885
886 bool odhcp6c_addr_in_scope(const struct in6_addr *addr)
887 {
888 FILE *fd = fopen("/proc/net/if_inet6", "r");
889 int len;
890 bool ret = false;
891 char buf[256];
892
893 if (fd == NULL)
894 return false;
895
896 while (fgets(buf, sizeof(buf), fd)) {
897 struct in6_addr inet6_addr;
898 uint32_t flags, dummy;
899 unsigned int i;
900 char name[IF_NAMESIZE], addr_buf[33];
901
902 len = strlen(buf);
903
904 if ((len <= 0) || buf[len - 1] != '\n')
905 break;
906
907 buf[--len] = '\0';
908
909 if (sscanf(buf, "%s %x %x %x %x %s",
910 addr_buf, &dummy, &dummy, &dummy, &flags, name) != 6)
911 break;
912
913 if (strcmp(name, ifname) ||
914 (flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE | IFA_F_DEPRECATED)))
915 continue;
916
917 for (i = 0; i < strlen(addr_buf); i++) {
918 if (!isxdigit(addr_buf[i]) || isupper(addr_buf[i]))
919 break;
920 }
921
922 memset(&inet6_addr, 0, sizeof(inet6_addr));
923 for (i = 0; i < (strlen(addr_buf) / 2); i++) {
924 unsigned char byte;
925 static const char hex[] = "0123456789abcdef";
926 byte = ((index(hex, addr_buf[i * 2]) - hex) << 4) |
927 (index(hex, addr_buf[i * 2 + 1]) - hex);
928 inet6_addr.s6_addr[i] = byte;
929 }
930
931 if ((IN6_IS_ADDR_LINKLOCAL(&inet6_addr) == IN6_IS_ADDR_LINKLOCAL(addr)) &&
932 (IN6_IS_ADDR_UNIQUELOCAL(&inet6_addr) == IN6_IS_ADDR_UNIQUELOCAL(addr))) {
933 ret = true;
934 break;
935 }
936 }
937
938 fclose(fd);
939 return ret;
940 }
941
942 static void sighandler(int signal)
943 {
944 if (signal == SIGUSR1)
945 signal_usr1 = true;
946 else if (signal == SIGUSR2)
947 signal_usr2 = true;
948 else if (signal == SIGIO)
949 signal_io = true;
950 else
951 signal_term = true;
952 }
953
954 static int add_opt(const uint16_t code, const uint8_t *data, const uint16_t len)
955 {
956 struct {
957 uint16_t code;
958 uint16_t len;
959 } opt_hdr = { htons(code), htons(len) };
960
961 if (odhcp6c_state_find_opt(code))
962 return -1;
963
964 if (odhcp6c_add_state(STATE_OPTS, &opt_hdr, sizeof(opt_hdr)) ||
965 odhcp6c_add_state(STATE_OPTS, data, len)) {
966 syslog(LOG_ERR, "Failed to add option %hu", code);
967 return 1;
968 }
969
970 return 0;
971 }
972
973 struct odhcp6c_opt *odhcp6c_find_opt(const uint16_t code)
974 {
975 struct odhcp6c_opt *opt = opts;
976
977 while (opt->code) {
978 if (opt->code == code)
979 return opt;
980
981 opt++;
982 }
983
984 return NULL;
985 }
986
987 static struct odhcp6c_opt *odhcp6c_find_opt_by_name(const char *name)
988 {
989 struct odhcp6c_opt *opt = opts;
990
991 if (!name || !strlen(name))
992 return NULL;
993
994 while (opt->code && (!opt->str || strcmp(opt->str, name)))
995 opt++;
996
997 return (opt->code > 0 ? opt : NULL);
998 }
999
1000 static int parse_opt_u8(const char *src, uint8_t **dst)
1001 {
1002 int len = strlen(src);
1003
1004 *dst = realloc(*dst, len/2);
1005 if (!*dst)
1006 return -1;
1007
1008 return script_unhexlify(*dst, len, src);
1009 }
1010
1011 static int parse_opt_string(const char *src, uint8_t **dst, const bool array)
1012 {
1013 int o_len = 0;
1014 char *sep = strpbrk(src, ARRAY_SEP);
1015
1016 if (sep && !array)
1017 return -1;
1018
1019 do {
1020 if (sep) {
1021 *sep = 0;
1022 sep++;
1023 }
1024
1025 int len = strlen(src);
1026
1027 *dst = realloc(*dst, o_len + len);
1028 if (!*dst)
1029 return -1;
1030
1031 memcpy(&((*dst)[o_len]), src, len);
1032
1033 o_len += len;
1034 src = sep;
1035
1036 if (sep)
1037 sep = strpbrk(src, ARRAY_SEP);
1038 } while (src);
1039
1040 return o_len;
1041 }
1042
1043 static int parse_opt_dns_string(const char *src, uint8_t **dst, const bool array)
1044 {
1045 int o_len = 0;
1046 char *sep = strpbrk(src, ARRAY_SEP);
1047
1048 if (sep && !array)
1049 return -1;
1050
1051 do {
1052 uint8_t tmp[256];
1053
1054 if (sep) {
1055 *sep = 0;
1056 sep++;
1057 }
1058
1059 int len = dn_comp(src, tmp, sizeof(tmp), NULL, NULL);
1060 if (len < 0)
1061 return -1;
1062
1063 *dst = realloc(*dst, o_len + len);
1064 if (!*dst)
1065 return -1;
1066
1067 memcpy(&((*dst)[o_len]), tmp, len);
1068
1069 o_len += len;
1070 src = sep;
1071
1072 if (sep)
1073 sep = strpbrk(src, ARRAY_SEP);
1074 } while (src);
1075
1076 return o_len;
1077 }
1078
1079 static int parse_opt_ip6(const char *src, uint8_t **dst, const bool array)
1080 {
1081 int o_len = 0;
1082 char *sep = strpbrk(src, ARRAY_SEP);
1083
1084 if (sep && !array)
1085 return -1;
1086
1087 do {
1088 int len = sizeof(struct in6_addr);
1089
1090 if (sep) {
1091 *sep = 0;
1092 sep++;
1093 }
1094
1095 *dst = realloc(*dst, o_len + len);
1096 if (!*dst)
1097 return -1;
1098
1099 if (inet_pton(AF_INET6, src, &((*dst)[o_len])) < 1)
1100 return -1;
1101
1102 o_len += len;
1103 src = sep;
1104
1105 if (sep)
1106 sep = strpbrk(src, ARRAY_SEP);
1107 } while (src);
1108
1109 return o_len;
1110 }
1111
1112 static int parse_opt_user_class(const char *src, uint8_t **dst, const bool array)
1113 {
1114 int o_len = 0;
1115 char *sep = strpbrk(src, ARRAY_SEP);
1116
1117 if (sep && !array)
1118 return -1;
1119
1120 do {
1121 if (sep) {
1122 *sep = 0;
1123 sep++;
1124 }
1125 uint16_t str_len = strlen(src);
1126
1127 *dst = realloc(*dst, o_len + str_len + 2);
1128 if (!*dst)
1129 return -1;
1130
1131 struct user_class {
1132 uint16_t len;
1133 uint8_t data[];
1134 } *e = (struct user_class *)&((*dst)[o_len]);
1135
1136 e->len = ntohs(str_len);
1137 memcpy(e->data, src, str_len);
1138
1139 o_len += str_len + 2;
1140 src = sep;
1141
1142 if (sep)
1143 sep = strpbrk(src, ARRAY_SEP);
1144 } while (src);
1145
1146 return o_len;
1147 }
1148
1149 static int parse_opt_data(const char *data, uint8_t **dst, const unsigned int type,
1150 const bool array)
1151 {
1152 int ret = 0;
1153
1154 switch (type) {
1155 case OPT_U8:
1156 ret = parse_opt_u8(data, dst);
1157 break;
1158
1159 case OPT_STR:
1160 ret = parse_opt_string(data, dst, array);
1161 break;
1162
1163 case OPT_DNS_STR:
1164 ret = parse_opt_dns_string(data, dst, array);
1165 break;
1166
1167 case OPT_IP6:
1168 ret = parse_opt_ip6(data, dst, array);
1169 break;
1170
1171 case OPT_USER_CLASS:
1172 ret = parse_opt_user_class(data, dst, array);
1173 break;
1174
1175 default:
1176 ret = -1;
1177 break;
1178 }
1179
1180 return ret;
1181 }
1182
1183 static int parse_opt(const char *opt)
1184 {
1185 uint32_t optn;
1186 char *data;
1187 uint8_t *payload = NULL;
1188 int payload_len;
1189 unsigned int type = OPT_U8;
1190 bool array = false;
1191 struct odhcp6c_opt *dopt = NULL;
1192 int ret = -1;
1193
1194 data = strpbrk(opt, ":");
1195 if (!data)
1196 return -1;
1197
1198 *data = '\0';
1199 data++;
1200
1201 if (strlen(opt) == 0 || strlen(data) == 0)
1202 return -1;
1203
1204 dopt = odhcp6c_find_opt_by_name(opt);
1205 if (!dopt) {
1206 char *e;
1207 optn = strtoul(opt, &e, 0);
1208 if (*e || e == opt || optn > USHRT_MAX)
1209 return -1;
1210
1211 dopt = odhcp6c_find_opt(optn);
1212 } else
1213 optn = dopt->code;
1214
1215 /* Check if the type for the content is well-known */
1216 if (dopt) {
1217 /* Refuse internal options */
1218 if (dopt->flags & OPT_INTERNAL)
1219 return -1;
1220
1221 type = dopt->flags & OPT_MASK_SIZE;
1222 array = ((dopt->flags & OPT_ARRAY) == OPT_ARRAY) ? true : false;
1223 } else if (data[0] == '"' || data[0] == '\'') {
1224 char *end = strrchr(data + 1, data[0]);
1225
1226 if (end && (end == (data + strlen(data) - 1))) {
1227 /* Raw option is specified as a string */
1228 type = OPT_STR;
1229 data++;
1230 *end = '\0';
1231 }
1232
1233 }
1234
1235 payload_len = parse_opt_data(data, &payload, type, array);
1236 if (payload_len > 0)
1237 ret = add_opt(optn, payload, payload_len);
1238
1239 free(payload);
1240
1241 return ret;
1242 }
Openwrt DHCPv6 Client