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 <arpa/inet.h> 17 #include <ctype.h> 18 #include <errno.h> 19 #include <fcntl.h> 20 #include <getopt.h> 21 #include <limits.h> 22 #include <linux/if_addr.h> 23 #include <net/if.h> 24 #include <netinet/icmp6.h> 25 #include <poll.h> 26 #include <resolv.h> 27 #include <signal.h> 28 #include <stdbool.h> 29 #include <stddef.h> 30 #include <stdlib.h> 31 #include <stdarg.h> 32 #include <stdio.h> 33 #include <string.h> 34 #include <strings.h> 35 #include <sys/syscall.h> 36 #include <time.h> 37 #include <unistd.h> 38 39 #include "config.h" 40 #include "odhcp6c.h" 41 #include "ra.h" 42 #include "ubus.h" 43 44 #define DHCPV6_FD_INDEX 0 45 #define UBUS_FD_INDEX 1 46 47 #ifndef IN6_IS_ADDR_UNIQUELOCAL 48 #define IN6_IS_ADDR_UNIQUELOCAL(a) \ 49 ((((__const uint32_t *) (a))[0] & htonl (0xfe000000)) \ 50 == htonl (0xfc000000)) 51 #endif 52 53 static void sighandler(int signal); 54 static int usage(void); 55 static void odhcp6c_cleanup(void); 56 57 static uint8_t *state_data[_STATE_MAX] = {NULL}; 58 static size_t state_len[_STATE_MAX] = {0}; 59 60 static volatile bool signal_io = false; 61 static volatile bool signal_usr1 = false; 62 static volatile bool signal_usr2 = false; 63 static volatile bool signal_term = false; 64 65 static bool client_id_param = false; 66 static int urandom_fd = -1; 67 static bool bound = false, ra = false; 68 static time_t last_update = 0; 69 static char *ifname = NULL; 70 static char *pidfile_path = NULL; 71 struct config_dhcp *config_dhcp = NULL; 72 73 static void odhcp6c_cleanup(void) 74 { 75 for (int i = 0; i < _STATE_MAX; ++i) { 76 free(state_data[i]); 77 state_data[i] = NULL; 78 state_len[i] = 0; 79 } 80 81 if (config_dhcp && config_dhcp->auth_token) { 82 free(config_dhcp->auth_token); 83 config_dhcp->auth_token = NULL; 84 } 85 86 if (urandom_fd >= 0) { 87 close(urandom_fd); 88 urandom_fd = -1; 89 } 90 91 if (pidfile_path) { 92 unlink(pidfile_path); 93 free(pidfile_path); 94 pidfile_path = NULL; 95 } 96 } 97 98 void __iflog(int lvl, const char *fmt, ...) 99 { 100 va_list ap; 101 102 if (lvl > config_dhcp->log_level) 103 return; 104 105 va_start(ap, fmt); 106 107 if (config_dhcp->log_syslog) { 108 vsyslog(lvl, fmt, ap); 109 } else { 110 vfprintf(stderr, fmt, ap); 111 fprintf(stderr, "\n"); 112 } 113 114 va_end(ap); 115 } 116 117 static unsigned int script_sync_delay = 10; 118 static unsigned int script_accu_delay = 1; 119 120 static struct odhcp6c_opt opts[] = { 121 { .code = DHCPV6_OPT_CLIENTID, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 122 { .code = DHCPV6_OPT_SERVERID, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 123 { .code = DHCPV6_OPT_IA_NA, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str= NULL }, 124 { .code = DHCPV6_OPT_IA_TA, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 125 { .code = DHCPV6_OPT_IA_ADDR, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 126 { .code = DHCPV6_OPT_ORO, .flags = OPT_INTERNAL, .str = NULL }, 127 { .code = DHCPV6_OPT_PREF, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 128 { .code = DHCPV6_OPT_ELAPSED, .flags = OPT_INTERNAL, .str = NULL }, 129 { .code = DHCPV6_OPT_RELAY_MSG, .flags = OPT_INTERNAL, .str = NULL }, 130 { .code = DHCPV6_OPT_AUTH, .flags = OPT_U8 | OPT_NO_PASSTHRU, .str = "authentication" }, 131 { .code = DHCPV6_OPT_UNICAST, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 132 { .code = DHCPV6_OPT_STATUS, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 133 { .code = DHCPV6_OPT_RAPID_COMMIT, .flags = OPT_INTERNAL, .str = NULL }, 134 { .code = DHCPV6_OPT_USER_CLASS, .flags = OPT_USER_CLASS | OPT_ARRAY, .str = "userclass" }, 135 { .code = DHCPV6_OPT_VENDOR_CLASS, .flags = OPT_U8, .str = "vendorclass" }, 136 { .code = DHCPV6_OPT_INTERFACE_ID, .flags = OPT_INTERNAL, .str = NULL }, 137 { .code = DHCPV6_OPT_RECONF_MESSAGE, .flags = OPT_INTERNAL, .str = NULL }, 138 { .code = DHCPV6_OPT_RECONF_ACCEPT, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 139 { .code = DHCPV6_OPT_SIP_SERVER_D, .flags = OPT_DNS_STR | OPT_ORO, .str = "sipserver_d" }, 140 { .code = DHCPV6_OPT_SIP_SERVER_A, .flags = OPT_IP6 | OPT_ARRAY | OPT_ORO, .str = "sipserver_a" }, 141 { .code = DHCPV6_OPT_DNS_SERVERS, .flags = OPT_IP6 | OPT_ARRAY | OPT_ORO, .str = "dns" }, 142 { .code = DHCPV6_OPT_DNS_DOMAIN, .flags = OPT_DNS_STR | OPT_ORO, .str = "search" }, 143 { .code = DHCPV6_OPT_IA_PD, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 144 { .code = DHCPV6_OPT_IA_PREFIX, .flags = OPT_INTERNAL, .str = NULL }, 145 { .code = DHCPV6_OPT_SNTP_SERVERS, .flags = OPT_IP6 | OPT_ARRAY | OPT_ORO, .str = "sntpservers" }, 146 { .code = DHCPV6_OPT_INFO_REFRESH, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU | OPT_ORO | OPT_ORO_STATELESS, .str = NULL }, 147 { .code = DHCPV6_OPT_REMOTE_ID, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 148 { .code = DHCPV6_OPT_SUBSCRIBER_ID, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 149 { .code = DHCPV6_OPT_FQDN, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU | OPT_ORO, .str = NULL }, 150 { .code = DHCPV6_OPT_ERO, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 151 { .code = DHCPV6_OPT_LQ_QUERY, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 152 { .code = DHCPV6_OPT_CLIENT_DATA, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 153 { .code = DHCPV6_OPT_CLT_TIME, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 154 { .code = DHCPV6_OPT_LQ_RELAY_DATA, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 155 { .code = DHCPV6_OPT_LQ_CLIENT_LINK, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 156 { .code = DHCPV6_OPT_RELAY_ID, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 157 { .code = DHCPV6_OPT_NTP_SERVER, .flags = OPT_U8 | OPT_ORO, .str = "ntpserver" }, 158 { .code = DHCPV6_OPT_CLIENT_ARCH_TYPE, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 159 { .code = DHCPV6_OPT_AFTR_NAME, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU | OPT_ORO, .str = NULL }, 160 { .code = DHCPV6_OPT_RSOO, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 161 { .code = DHCPV6_OPT_PD_EXCLUDE, .flags = OPT_INTERNAL | OPT_ORO | OPT_ORO_STATEFUL, .str = NULL }, 162 { .code = DHCPV6_OPT_VSS, .flags = OPT_U8, .str = "vss" }, 163 { .code = DHCPV6_OPT_LINK_LAYER_ADDRESS, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 164 { .code = DHCPV6_OPT_LINK_ADDRESS, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 165 { .code = DHCPV6_OPT_RADIUS, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 166 { .code = DHCPV6_OPT_SOL_MAX_RT, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU | OPT_ORO | OPT_ORO_SOLICIT, .str = NULL }, 167 { .code = DHCPV6_OPT_INF_MAX_RT, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU | OPT_ORO | OPT_ORO_STATELESS, .str = NULL }, 168 { .code = DHCPV6_OPT_DHCPV4_MSG, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 169 { .code = DHCPV6_OPT_S46_RULE, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 170 { .code = DHCPV6_OPT_S46_BR, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 171 { .code = DHCPV6_OPT_S46_DMR, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 172 { .code = DHCPV6_OPT_S46_V4V6BIND, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 173 { .code = DHCPV6_OPT_S46_PORTPARAMS, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 174 { .code = DHCPV6_OPT_S46_CONT_MAPE, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU | OPT_ORO, .str = NULL }, 175 { .code = DHCPV6_OPT_S46_CONT_MAPT, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU | OPT_ORO, .str = NULL }, 176 { .code = DHCPV6_OPT_S46_CONT_LW, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU | OPT_ORO, .str = NULL }, 177 { .code = DHCPV6_OPT_LQ_BASE_TIME, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 178 { .code = DHCPV6_OPT_LQ_START_TIME, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 179 { .code = DHCPV6_OPT_LQ_END_TIME, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 180 { .code = DHCPV6_OPT_ANI_ATT, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 181 { .code = DHCPV6_OPT_ANI_NETWORK_NAME, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 182 { .code = DHCPV6_OPT_ANI_AP_NAME, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 183 { .code = DHCPV6_OPT_ANI_AP_BSSID, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 184 { .code = DHCPV6_OPT_ANI_OPERATOR_ID, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 185 { .code = DHCPV6_OPT_ANI_OPERATOR_REALM, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 186 { .code = DHCPV6_OPT_MUD_URL_V6, .flags = OPT_STR | OPT_NO_PASSTHRU, .str = "mud_url_v6" }, 187 { .code = DHCPV6_OPT_F_BINDING_STATUS, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 188 { .code = DHCPV6_OPT_F_CONNECT_FLAGS, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 189 { .code = DHCPV6_OPT_F_DNS_REMOVAL_INFO, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 190 { .code = DHCPV6_OPT_F_DNS_HOST_NAME, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 191 { .code = DHCPV6_OPT_F_DNS_ZONE_NAME, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 192 { .code = DHCPV6_OPT_F_DNS_FLAGS, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 193 { .code = DHCPV6_OPT_F_EXPIRATION_TIME, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 194 { .code = DHCPV6_OPT_F_MAX_UNACKED_BNDUPD, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 195 { .code = DHCPV6_OPT_F_MCLT, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 196 { .code = DHCPV6_OPT_F_PARTNER_LIFETIME, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 197 { .code = DHCPV6_OPT_F_PARTNER_LIFETIME_SENT, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 198 { .code = DHCPV6_OPT_F_PARTNER_DOWN_TIME, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 199 { .code = DHCPV6_OPT_F_PARTNER_RAW_CLT_TIME, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 200 { .code = DHCPV6_OPT_F_PROTOCOL_VERSION, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 201 { .code = DHCPV6_OPT_F_KEEPALIVE_TIME, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 202 { .code = DHCPV6_OPT_F_RECONFIGURE_DATA, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 203 { .code = DHCPV6_OPT_F_RELATIONSHIP_NAME, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 204 { .code = DHCPV6_OPT_F_SERVER_FLAGS, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 205 { .code = DHCPV6_OPT_F_SERVER_STATE, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 206 { .code = DHCPV6_OPT_F_START_TIME_OF_STATE, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 207 { .code = DHCPV6_OPT_F_STATE_EXPIRATION_TIME, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 208 { .code = DHCPV6_OPT_RELAY_PORT, .flags = OPT_INTERNAL | OPT_NO_PASSTHRU, .str = NULL }, 209 { .code = 0, .flags = 0, .str = NULL }, 210 }; 211 212 static struct odhcp6c_opt_cfg opt_cfg = { 213 .strict_rfc7550 = 0, 214 }; 215 216 static struct option opt_long[] = { 217 { "strict-rfc7550", no_argument, &opt_cfg.strict_rfc7550, 1 }, 218 { NULL, 0, NULL, 0 }, 219 }; 220 221 int main(_o_unused int argc, char* const argv[]) 222 { 223 static struct in6_addr ifid = IN6ADDR_ANY_INIT; 224 // Allocate resources 225 const char *pidfile = NULL; 226 const char *script = "/lib/netifd/dhcpv6.script"; 227 ssize_t l; 228 uint8_t buf[134], *o_data; 229 int optidx; 230 char *optpos; 231 uint16_t opttype; 232 struct odhcp6c_opt *opt; 233 int ia_pd_iaid_index = 0; 234 bool help = false, daemonize = false; 235 int logopt = LOG_PID; 236 int c; 237 int res = -1; 238 unsigned int ra_options = RA_RDNSS_DEFAULT_LIFETIME; 239 unsigned int ra_holdoff_interval = RA_MIN_ADV_INTERVAL; 240 ra_ifid_mode_t ra_ifid_mode = RA_IFID_LLA; 241 bool terminate = false; 242 bool deprecated_opt = false; 243 244 config_dhcp = config_dhcp_get(); 245 config_dhcp_reset(); 246 247 atexit(odhcp6c_cleanup); 248 249 while ((c = getopt_long(argc, argv, "SDN:V:P:FB:c:i:r:Ru:Ux:s:EkK:t:C:m:Lhedp:favl:", opt_long, &optidx)) != -1) { 250 switch (c) { 251 case 0: 252 break; 253 254 case 'S': 255 config_set_allow_slaac_only(false); 256 break; 257 258 case 'D': 259 config_set_stateful_only(true); 260 break; 261 262 case 'N': 263 if (!config_set_request_addresses(optarg)) 264 help = true; 265 break; 266 267 case 'V': 268 opt = odhcp6c_find_opt(DHCPV6_OPT_VENDOR_CLASS); 269 if (!opt) { 270 error("Failed to set vendor-class option"); 271 return 1; 272 } 273 274 o_data = NULL; 275 res = config_parse_opt_data(optarg, &o_data, opt->flags & OPT_MASK_SIZE, 276 (opt->flags & OPT_ARRAY) == OPT_ARRAY); 277 if (res > 0) { 278 res = config_add_opt(opt->code, o_data, res); 279 if (res) { 280 if (res > 0) 281 return 1; 282 283 help = true; 284 } 285 } else { 286 help = true; 287 } 288 289 free(o_data); 290 break; 291 292 case 'P': 293 if (config_dhcp->ia_pd_mode == IA_MODE_NONE) 294 config_dhcp->ia_pd_mode = IA_MODE_TRY; 295 296 struct odhcp6c_request_prefix prefix = { 0 }; 297 298 optpos = strchr(optarg, '/'); 299 if (optpos) { 300 size_t addr_len = optpos - optarg; 301 302 /* Leave room for the terminating NUL; reject anything 303 * that cannot be a valid IPv6 literal instead of 304 * overflowing buf. */ 305 if (addr_len >= sizeof(buf)) { 306 error("invalid argument: '%s'", optarg); 307 return 1; 308 } 309 strncpy((char *)buf, optarg, addr_len); 310 buf[addr_len] = '\0'; 311 if (inet_pton(AF_INET6, (char *)buf, &prefix.addr) <= 0) { 312 error("invalid argument: '%s'", optarg); 313 return 1; 314 } 315 optpos++; 316 } else { 317 optpos = optarg; 318 } 319 320 char *iaid_begin; 321 int iaid_len = 0; 322 prefix.length = strtoul(optpos, &iaid_begin, 10); 323 324 if (*iaid_begin != '\0' && *iaid_begin != ',' && *iaid_begin != ':') { 325 error("invalid argument: '%s'", optarg); 326 return 1; 327 } 328 329 if (*iaid_begin == ',' && (iaid_len = strlen(iaid_begin)) > 1) 330 memcpy(&prefix.iaid, iaid_begin + 1, iaid_len > 4 ? 4 : iaid_len); 331 else if (*iaid_begin == ':') 332 prefix.iaid = htonl((uint32_t)strtoul(&iaid_begin[1], NULL, 16)); 333 else 334 prefix.iaid = htonl(++ia_pd_iaid_index); 335 336 if (odhcp6c_add_state(STATE_IA_PD_INIT, &prefix, sizeof(prefix))) { 337 error("Failed to set request IPv6-Prefix"); 338 return 1; 339 } 340 break; 341 342 case 'F': 343 config_set_force_prefix(true); 344 break; 345 346 case 'c': 347 l = script_unhexlify(&buf[4], sizeof(buf) - DHCPV6_OPT_HDR_SIZE, optarg); 348 if (l > 0) { 349 buf[0] = 0; 350 buf[1] = DHCPV6_OPT_CLIENTID; 351 buf[2] = 0; 352 buf[3] = l; 353 if (odhcp6c_add_state(STATE_CLIENT_ID, buf, l + 4)) { 354 error("Failed to override client-ID"); 355 return 1; 356 } else { 357 client_id_param = true; 358 } 359 } else { 360 help = true; 361 } 362 break; 363 364 case 'i': 365 if (!strcmp(optarg, DHCPV6_IFACEID_EUI64)) { 366 ra_ifid_mode = RA_IFID_EUI64; 367 } else if (!strcmp(optarg, DHCPV6_IFACEID_RANDOM)) { 368 ra_ifid_mode = RA_IFID_RANDOM; 369 } else if (inet_pton(AF_INET6, optarg, &ifid) == 1) { 370 ra_ifid_mode = RA_IFID_FIXED; 371 ifid.s6_addr[0] = 0xfe; 372 ifid.s6_addr[1] = 0x80; 373 } else { 374 /* Do not error on bad values; fall back to default */ 375 error("Invalid interface-ID: %s", optarg); 376 } 377 break; 378 379 case 'r': 380 optpos = optarg; 381 while (optpos[0]) { 382 opttype = htons(strtoul(optarg, &optpos, 10)); 383 if (optpos == optarg) 384 break; 385 else if (optpos[0]) 386 optarg = &optpos[1]; 387 388 if (odhcp6c_add_state(STATE_ORO, &opttype, 2)) { 389 error("Failed to add requested option"); 390 return 1; 391 } 392 } 393 break; 394 395 case 'R': 396 config_set_client_options(DHCPV6_STRICT_OPTIONS, true); 397 break; 398 399 case 'u': 400 opt = odhcp6c_find_opt(DHCPV6_OPT_USER_CLASS); 401 if (!opt) { 402 error("Failed to set user-class option"); 403 return 1; 404 } 405 406 o_data = NULL; 407 res = config_parse_opt_data(optarg, &o_data, opt->flags & OPT_MASK_SIZE, 408 (opt->flags & OPT_ARRAY) == OPT_ARRAY); 409 if (res > 0) { 410 res = config_add_opt(opt->code, o_data, res); 411 if (res) { 412 if (res > 0) 413 return 1; 414 415 help = true; 416 } 417 } else { 418 help = true; 419 } 420 421 free(o_data); 422 break; 423 424 case 'U': 425 config_set_client_options(DHCPV6_IGNORE_OPT_UNICAST, true); 426 break; 427 428 case 's': 429 if (script) 430 script = optarg; 431 break; 432 433 case 'E': 434 #ifndef WITH_UBUS 435 error("Failed to use ubus event: ENABLE_UBUS compilation flag missing"); 436 return 1; 437 #endif /* WITH_UBUS */ 438 script = NULL; 439 break; 440 441 case 'k': 442 config_set_release(false); 443 break; 444 445 case 'K': 446 config_set_sk_priority(atoi(optarg)); 447 break; 448 449 case 't': 450 config_set_rtx_timeout_max(CONFIG_DHCP_SOLICIT, atoi(optarg)); 451 break; 452 453 case 'C': 454 config_set_dscp(atoi(optarg)); 455 break; 456 457 case 'm': 458 ra_holdoff_interval = atoi(optarg); 459 break; 460 461 case 'L': 462 ra_options &= ~RA_RDNSS_DEFAULT_LIFETIME; 463 break; 464 465 case 'e': 466 logopt |= LOG_PERROR; 467 break; 468 469 case 'd': 470 daemonize = true; 471 break; 472 473 case 'p': 474 pidfile = optarg; 475 break; 476 477 case 'f': 478 config_set_client_options(DHCPV6_CLIENT_FQDN, false); 479 break; 480 481 case 'a': 482 config_set_client_options(DHCPV6_ACCEPT_RECONFIGURE, false); 483 break; 484 485 case 'v': 486 /* deprecated - remove -v options from start scripts first */ 487 deprecated_opt = true; 488 break; 489 490 case 'l': 491 config_dhcp->log_level = (atoi(optarg) & LOG_PRIMASK); 492 break; 493 494 case 'x': 495 res = config_parse_opt(optarg); 496 if (res) { 497 if (res > 0) 498 return res; 499 500 help = true; 501 } 502 break; 503 504 default: 505 help = true; 506 break; 507 } 508 } 509 510 config_set_client_opt_cfg(&opt_cfg); 511 512 openlog("odhcp6c", logopt, LOG_DAEMON); 513 setlogmask(LOG_UPTO(config_dhcp->log_level)); 514 515 ifname = argv[optind]; 516 517 if (help || !ifname) 518 return usage(); 519 520 signal(SIGIO, sighandler); 521 signal(SIGHUP, sighandler); 522 signal(SIGINT, sighandler); 523 signal(SIGTERM, sighandler); 524 signal(SIGUSR1, sighandler); 525 signal(SIGUSR2, sighandler); 526 527 if (daemonize) { 528 openlog("odhcp6c", LOG_PID, LOG_DAEMON); // Disable LOG_PERROR 529 if (daemon(0, 0)) { 530 error("Failed to daemonize: %s", 531 strerror(errno)); 532 return 3; 533 } 534 535 if (!pidfile) { 536 snprintf((char*)buf, sizeof(buf), "/var/run/odhcp6c.%s.pid", ifname); 537 pidfile = (char*)buf; 538 } 539 540 int pidfd = open(pidfile, 541 O_WRONLY | O_CREAT | O_TRUNC | O_NOFOLLOW | O_CLOEXEC, 542 0644); 543 if (pidfd >= 0) { 544 FILE *fp = fdopen(pidfd, "w"); 545 if (fp) { 546 fprintf(fp, "%i\n", getpid()); 547 fclose(fp); 548 pidfile_path = strdup(pidfile); 549 } else { 550 close(pidfd); 551 } 552 } 553 } else { 554 config_dhcp->log_syslog = false; 555 } 556 557 if (deprecated_opt) 558 warn("The -v flag is deprecated and will be removed. Use -l[0-7]."); 559 560 if ((urandom_fd = open("/dev/urandom", O_CLOEXEC | O_RDONLY)) < 0 || 561 ra_init(ifname, &ifid, ra_ifid_mode, ra_options, ra_holdoff_interval) || 562 script_init(script, ifname)) { 563 error("failed to initialize: %s", strerror(errno)); 564 return 4; 565 } 566 567 struct pollfd fds[2] = {0}; 568 int nfds = 0; 569 570 int mode = DHCPV6_UNKNOWN; 571 enum dhcpv6_msg req_msg_type = DHCPV6_MSG_UNKNOWN; 572 573 fds[DHCPV6_FD_INDEX].fd = -1; 574 fds[DHCPV6_FD_INDEX].events = POLLIN; 575 nfds++; 576 577 #ifdef WITH_UBUS 578 char *err = ubus_init(ifname); 579 if (err) { 580 error("ubus error: %s", err); 581 return 1; 582 } 583 584 struct ubus_context *ubus = ubus_get_ctx(); 585 int ubus_socket = ubus->sock.fd; 586 if (ubus_socket < 0) { 587 error("Invalid ubus file descriptor"); 588 return 1; 589 } 590 fds[UBUS_FD_INDEX].fd = ubus_socket; 591 fds[UBUS_FD_INDEX].events = POLLIN; 592 nfds++; 593 #endif /* WITH_UBUS */ 594 595 notify_state_change("started", 0, false); 596 597 while (!terminate) { // Main logic 598 int poll_res; 599 bool signalled = odhcp6c_signal_process(); 600 601 switch (dhcpv6_get_state()) { 602 case DHCPV6_INIT: 603 odhcp6c_clear_state(STATE_SERVER_ID); 604 odhcp6c_clear_state(STATE_SERVER_ADDR); 605 odhcp6c_clear_state(STATE_IA_NA); 606 odhcp6c_clear_state(STATE_IA_PD); 607 odhcp6c_clear_state(STATE_SNTP_IP); 608 odhcp6c_clear_state(STATE_NTP_IP); 609 odhcp6c_clear_state(STATE_NTP_FQDN); 610 odhcp6c_clear_state(STATE_SIP_IP); 611 odhcp6c_clear_state(STATE_SIP_FQDN); 612 odhcp6c_clear_state(STATE_CAPT_PORT_DHCPV6); 613 bound = false; 614 res = -1; 615 616 size_t oro_len = 0; 617 odhcp6c_get_state(STATE_ORO, &oro_len); 618 config_dhcp->oro_user_cnt = oro_len / sizeof(uint16_t); 619 620 if (init_dhcpv6(ifname)) { 621 error("failed to initialize: %s", strerror(errno)); 622 return 1; 623 } 624 625 fds[DHCPV6_FD_INDEX].fd = dhcpv6_get_socket(); 626 627 notice("(re)starting transaction on %s", ifname); 628 629 signal_usr1 = signal_usr2 = false; 630 631 dhcpv6_set_state(DHCPV6_SOLICIT); 632 break; 633 634 case DHCPV6_SOLICIT: 635 mode = dhcpv6_get_ia_mode(); 636 if (mode == DHCPV6_STATELESS) { 637 dhcpv6_set_state(DHCPV6_REQUEST); 638 break; 639 } 640 641 req_msg_type = DHCPV6_MSG_SOLICIT; 642 dhcpv6_send_request(req_msg_type); 643 break; 644 645 case DHCPV6_ADVERT: 646 if (res > 0) { 647 mode = DHCPV6_STATEFUL; 648 dhcpv6_set_state(DHCPV6_REQUEST); 649 } else { 650 mode = DHCPV6_UNKNOWN; 651 dhcpv6_set_state(DHCPV6_RESET); 652 } 653 break; 654 655 case DHCPV6_REQUEST: 656 req_msg_type = (mode == DHCPV6_STATELESS) ? DHCPV6_MSG_INFO_REQ : DHCPV6_MSG_REQUEST; 657 dhcpv6_send_request(req_msg_type); 658 break; 659 660 case DHCPV6_REPLY: 661 if ((res > 0) && mode != DHCPV6_UNKNOWN) { 662 dhcpv6_set_state(DHCPV6_BOUND); 663 break; 664 } 665 666 if ((res < 0) && signalled) { 667 mode = DHCPV6_UNKNOWN; 668 dhcpv6_set_state(DHCPV6_RESET); 669 break; 670 } 671 672 mode = dhcpv6_promote_server_cand(); 673 dhcpv6_set_state(mode > DHCPV6_UNKNOWN ? DHCPV6_REQUEST : DHCPV6_RESET); 674 break; 675 676 case DHCPV6_BOUND: 677 if (!bound) { 678 bound = true; 679 if (mode == DHCPV6_STATELESS) { 680 notice("entering stateless-mode on %s", ifname); 681 signal_usr1 = false; 682 notify_state_change("informed", script_sync_delay, true); 683 } else { 684 notify_state_change("bound", script_sync_delay, true); 685 notice("entering stateful-mode on %s", ifname); 686 } 687 } 688 689 req_msg_type = DHCPV6_MSG_UNKNOWN; 690 dhcpv6_send_request(req_msg_type); 691 break; 692 693 case DHCPV6_BOUND_REPLY: 694 if (res == DHCPV6_MSG_RENEW || res == DHCPV6_MSG_REBIND || 695 res == DHCPV6_MSG_INFO_REQ) { 696 req_msg_type = res; 697 dhcpv6_set_state(DHCPV6_RECONF); 698 } else { 699 dhcpv6_set_state(DHCPV6_RECONF_REPLY); 700 } 701 break; 702 703 case DHCPV6_RECONF: 704 dhcpv6_send_request(req_msg_type); 705 break; 706 707 case DHCPV6_RECONF_REPLY: 708 if (res > 0) { 709 dhcpv6_set_state(DHCPV6_BOUND); 710 if (mode == DHCPV6_STATEFUL) 711 notify_state_change("updated", 0, false); 712 } else { 713 dhcpv6_set_state(mode == DHCPV6_STATELESS ? DHCPV6_INFO : DHCPV6_RENEW); 714 } 715 break; 716 717 case DHCPV6_RENEW: 718 req_msg_type = DHCPV6_MSG_RENEW; 719 dhcpv6_send_request(req_msg_type); 720 break; 721 722 case DHCPV6_RENEW_REPLY: 723 if (res > 0 ) { 724 notify_state_change("updated", 0, false); 725 dhcpv6_set_state(DHCPV6_BOUND); 726 } else { 727 dhcpv6_set_state(DHCPV6_REBIND); 728 } 729 break; 730 731 case DHCPV6_REBIND: 732 odhcp6c_clear_state(STATE_SERVER_ID); // Remove binding 733 odhcp6c_clear_state(STATE_SERVER_ADDR); 734 735 size_t ia_pd_len_r, ia_na_len_r; 736 odhcp6c_get_state(STATE_IA_PD, &ia_pd_len_r); 737 odhcp6c_get_state(STATE_IA_NA, &ia_na_len_r); 738 739 // If we have IAs, try rebind otherwise restart 740 if (ia_pd_len_r == 0 && ia_na_len_r == 0) { 741 dhcpv6_set_state(DHCPV6_RESET); 742 break; 743 } 744 745 req_msg_type = DHCPV6_MSG_REBIND; 746 dhcpv6_send_request(req_msg_type); 747 break; 748 749 case DHCPV6_REBIND_REPLY: 750 if (res < 0) { 751 dhcpv6_set_state(DHCPV6_RESET); 752 } else { 753 notify_state_change("rebound", 0, true); 754 dhcpv6_set_state(DHCPV6_BOUND); 755 } 756 break; 757 758 case DHCPV6_INFO: 759 req_msg_type = DHCPV6_MSG_INFO_REQ; 760 dhcpv6_send_request(req_msg_type); 761 break; 762 763 case DHCPV6_INFO_REPLY: 764 dhcpv6_set_state(res < 0 ? DHCPV6_RESET : DHCPV6_BOUND); 765 break; 766 767 case DHCPV6_SOLICIT_PROCESSING: 768 case DHCPV6_REQUEST_PROCESSING: 769 res = dhcpv6_state_processing(req_msg_type); 770 break; 771 772 case DHCPV6_BOUND_PROCESSING: 773 case DHCPV6_RECONF_PROCESSING: 774 case DHCPV6_REBIND_PROCESSING: 775 res = dhcpv6_state_processing(req_msg_type); 776 777 if (signal_usr1) 778 dhcpv6_set_state(mode == DHCPV6_STATELESS ? DHCPV6_INFO : DHCPV6_RENEW); 779 break; 780 781 case DHCPV6_RENEW_PROCESSING: 782 case DHCPV6_INFO_PROCESSING: 783 res = dhcpv6_state_processing(req_msg_type); 784 785 if (signal_usr1) 786 signal_usr1 = false; // Acknowledged 787 break; 788 789 case DHCPV6_EXIT: 790 odhcp6c_expire(false); 791 792 size_t ia_pd_len, ia_na_len, server_id_len; 793 odhcp6c_get_state(STATE_IA_PD, &ia_pd_len); 794 odhcp6c_get_state(STATE_IA_NA, &ia_na_len); 795 odhcp6c_get_state(STATE_SERVER_ID, &server_id_len); 796 797 // Add all prefixes to lost prefixes 798 if (bound) { 799 bound = false; 800 notify_state_change("unbound", 0, true); 801 } 802 803 if (server_id_len > 0 && (ia_pd_len > 0 || ia_na_len > 0) && (!signal_term || config_dhcp->release)) 804 dhcpv6_send_request(DHCPV6_MSG_RELEASE); 805 806 odhcp6c_clear_state(STATE_IA_NA); 807 odhcp6c_clear_state(STATE_IA_PD); 808 809 if (signal_term) { 810 terminate = true; 811 } else { 812 signal_usr2 = false; 813 dhcpv6_set_state(DHCPV6_RESET); 814 } 815 break; 816 817 case DHCPV6_RESET: 818 if (!client_id_param) 819 odhcp6c_clear_state(STATE_CLIENT_ID); 820 821 if (bound) { 822 bound = false; 823 notify_state_change("unbound", 0, true); 824 } 825 826 size_t oro_user_len, oro_total_len; 827 odhcp6c_get_state(STATE_ORO, &oro_total_len); 828 oro_user_len = config_dhcp->oro_user_cnt * sizeof(uint16_t); 829 odhcp6c_remove_state(STATE_ORO, oro_user_len, oro_total_len - oro_user_len); 830 831 close(dhcpv6_get_socket()); 832 fds[DHCPV6_FD_INDEX].fd = -1; 833 834 dhcpv6_set_state(DHCPV6_INIT); 835 break; 836 837 default: 838 break; 839 } 840 841 if (signal_usr2 || signal_term) 842 dhcpv6_set_state(DHCPV6_EXIT); 843 844 poll_res = poll(fds, nfds, dhcpv6_get_state_timeout()); 845 dhcpv6_reset_state_timeout(); 846 if (poll_res == -1 && (errno == EINTR || errno == EAGAIN)) { 847 continue; 848 } 849 850 if (fds[0].revents & POLLIN) 851 dhcpv6_receive_response(req_msg_type); 852 853 #ifdef WITH_UBUS 854 if (fds[1].revents & POLLIN) 855 ubus_handle_event(ubus); 856 #endif /* WITH_UBUS */ 857 } 858 859 notify_state_change("stopped", 0, true); 860 861 #ifdef WITH_UBUS 862 ubus_destroy(ubus); 863 #endif /* WITH_UBUS */ 864 865 return 0; 866 } 867 868 static int usage(void) 869 { 870 const char buf[] = 871 "Usage: odhcp6c [options] <interface>\n" 872 "\nFeature options:\n" 873 " -S Don't allow configuration via SLAAC (RAs) only\n" 874 " -D Discard advertisements without any address or prefix proposed\n" 875 " -N <mode> Mode for requesting addresses [try|force|none]\n" 876 " -P <[pfx/]len> Request IPv6-Prefix (0 = auto)\n" 877 " -F Force IPv6-Prefix\n" 878 " -V <class> Set vendor-class option (base-16 encoded)\n" 879 " -u <user-class> Set user-class option string\n" 880 " -x <opt>:<val> Add option opt (with value val) in sent packets (cumulative)\n" 881 " Examples of IPv6 address, string and base-16 encoded options:\n" 882 " -x dns:2001:2001::1,2001:2001::2 - option 23\n" 883 " -x 15:office - option 15 (userclass)\n" 884 " -x 0x1f4:ABBA - option 500\n" 885 " -x 202:'\"file\"' - option 202\n" 886 " -c <clientid> Override client-ID (base-16 encoded 16-bit type + value)\n" 887 " -i <iface-id> Use a custom interface identifier for RA handling\n" 888 " -r <options> Options to be requested (comma-separated)\n" 889 " -R Do not request any options except those specified with -r\n" 890 " -s <script> Status update script (/lib/netifd/dhcpv6.script)\n" 891 " -E Only use UBUS event and disable status update script\n" 892 " -a Don't send Accept Reconfigure option\n" 893 " -f Don't send Client FQDN option\n" 894 " -k Don't send a RELEASE when stopping\n" 895 " -K <sk-prio> Set packet kernel priority (0)\n" 896 " -C <dscp> Set packet DSCP value (0)\n" 897 " -t <seconds> Maximum timeout for DHCPv6-SOLICIT (120)\n" 898 " -m <seconds> Minimum time between accepting RA updates (3)\n" 899 " -L Ignore default lifetime for RDNSS records\n" 900 " -U Ignore Server Unicast option\n" 901 " --strict-rfc7550 Enforce RFC7550 compliance\n" 902 "\nInvocation options:\n" 903 " -p <pidfile> Set pidfile (/var/run/odhcp6c.pid)\n" 904 " -d Daemonize\n" 905 " -e Write logmessages to stderr\n" 906 " -l <level> Set logging level (0-7)\n" 907 " -h Show this help\n\n"; 908 fputs(buf, stderr); 909 910 return 1; 911 } 912 913 // Don't want to pull-in librt and libpthread just for a monotonic clock... 914 uint64_t odhcp6c_get_milli_time(void) 915 { 916 struct timespec t; 917 918 clock_gettime(CLOCK_MONOTONIC, &t); 919 920 return ((uint64_t)t.tv_sec) * 1000 + ((uint64_t)t.tv_nsec) / 1000000; 921 } 922 923 static uint8_t* odhcp6c_resize_state(enum odhcp6c_state state, ssize_t len) 924 { 925 if (len == 0) 926 return state_data[state] + state_len[state]; 927 else if (state_len[state] + len > 1024) 928 return NULL; 929 930 uint8_t *n = realloc(state_data[state], state_len[state] + len); 931 932 if (n || state_len[state] + len == 0) { 933 state_data[state] = n; 934 n += state_len[state]; 935 state_len[state] += len; 936 } 937 938 return n; 939 } 940 941 static bool odhcp6c_server_advertised() 942 { 943 size_t len; 944 uint8_t *start = odhcp6c_get_state(STATE_RA_ROUTE, &len); 945 946 for (struct odhcp6c_entry *c = (struct odhcp6c_entry*)start; 947 (uint8_t*)c < &start[len] && 948 (uint8_t*)odhcp6c_next_entry(c) <= &start[len]; 949 c = odhcp6c_next_entry(c)) { 950 // Only default route entries have flags 951 if (c->length != 0 || IN6_IS_ADDR_UNSPECIFIED(&c->router)) 952 continue; 953 954 if (c->ra_flags & (ND_RA_FLAG_MANAGED | ND_RA_FLAG_OTHER)) 955 return true; 956 } 957 958 return false; 959 } 960 961 bool odhcp6c_signal_process(void) 962 { 963 while (signal_io) { 964 signal_io = false; 965 966 size_t old_ra_prefix_size = state_len[STATE_RA_PREFIX]; 967 bool ra_updated = ra_process(); 968 969 if (ra_link_up()) { 970 signal_usr2 = true; 971 ra = false; 972 } else if (old_ra_prefix_size != state_len[STATE_RA_PREFIX] && 973 odhcp6c_server_advertised()) { 974 // Restart DHCPv6 transaction when router advertisement flags 975 // show presence of a DHCPv6 server and new prefixes were 976 // added to STATE_RA_PREFIX state 977 signal_usr2 = true; 978 } 979 980 if (ra_updated && (bound || config_dhcp->allow_slaac_only)) { 981 notify_state_change("ra-updated", (!ra && !bound) ? 982 script_sync_delay : script_accu_delay, false); 983 ra = true; 984 } 985 } 986 987 return signal_usr1 || signal_usr2 || signal_term; 988 } 989 990 void odhcp6c_clear_state(enum odhcp6c_state state) 991 { 992 state_len[state] = 0; 993 } 994 995 int odhcp6c_add_state(enum odhcp6c_state state, const void *data, size_t len) 996 { 997 uint8_t *n = odhcp6c_resize_state(state, len); 998 999 if (!n) 1000 return -1; 1001 1002 memcpy(n, data, len); 1003 1004 return 0; 1005 } 1006 1007 int odhcp6c_insert_state(enum odhcp6c_state state, size_t offset, const void *data, size_t len) 1008 { 1009 ssize_t len_after = state_len[state] - offset; 1010 if (len_after < 0) 1011 return -1; 1012 1013 uint8_t *n = odhcp6c_resize_state(state, len); 1014 1015 if (!n) 1016 return -1; 1017 1018 uint8_t *sdata = state_data[state]; 1019 1020 memmove(sdata + offset + len, sdata + offset, len_after); 1021 memcpy(sdata + offset, data, len); 1022 1023 return 0; 1024 } 1025 1026 size_t odhcp6c_remove_state(enum odhcp6c_state state, size_t offset, size_t len) 1027 { 1028 uint8_t *data = state_data[state]; 1029 ssize_t len_after = state_len[state] - (offset + len); 1030 1031 if (len_after < 0) 1032 return state_len[state]; 1033 1034 memmove(data + offset, data + offset + len, len_after); 1035 1036 return state_len[state] -= len; 1037 } 1038 1039 void* odhcp6c_move_state(enum odhcp6c_state state, size_t *len) 1040 { 1041 *len = state_len[state]; 1042 void *data = state_data[state]; 1043 1044 state_len[state] = 0; 1045 state_data[state] = NULL; 1046 1047 return data; 1048 } 1049 1050 void* odhcp6c_get_state(enum odhcp6c_state state, size_t *len) 1051 { 1052 *len = state_len[state]; 1053 1054 return state_data[state]; 1055 } 1056 1057 static struct odhcp6c_entry* odhcp6c_find_entry(enum odhcp6c_state state, const struct odhcp6c_entry *new) 1058 { 1059 size_t len, cmplen = offsetof(struct odhcp6c_entry, target) + ((new->length + 7) / 8); 1060 uint8_t *start = odhcp6c_get_state(state, &len); 1061 1062 for (struct odhcp6c_entry *c = (struct odhcp6c_entry*)start; 1063 (uint8_t*)c < &start[len] && 1064 (uint8_t*)odhcp6c_next_entry(c) <= &start[len]; 1065 c = odhcp6c_next_entry(c)) { 1066 if (!memcmp(c, new, cmplen) && !memcmp(c->auxtarget, new->auxtarget, new->auxlen)) 1067 return c; 1068 } 1069 1070 return NULL; 1071 } 1072 1073 bool odhcp6c_update_entry(enum odhcp6c_state state, struct odhcp6c_entry *new, 1074 unsigned int holdoff_interval) 1075 { 1076 struct odhcp6c_entry *x = odhcp6c_find_entry(state, new); 1077 1078 if (x) { 1079 if (holdoff_interval && new->valid >= x->valid && 1080 new->valid != UINT32_MAX && 1081 new->valid - x->valid < holdoff_interval && 1082 new->preferred >= x->preferred && 1083 new->preferred != UINT32_MAX && 1084 new->preferred - x->preferred < holdoff_interval) 1085 return false; 1086 1087 x->valid = new->valid; 1088 x->ra_flags = new->ra_flags; 1089 x->priority = new->priority; 1090 x->preferred = new->preferred; 1091 x->t1 = new->t1; 1092 x->t2 = new->t2; 1093 x->iaid = new->iaid; 1094 } else if (odhcp6c_add_state(state, new, odhcp6c_entry_size(new))) { 1095 return false; 1096 } 1097 1098 return true; 1099 } 1100 1101 static void odhcp6c_expire_list(enum odhcp6c_state state, uint32_t elapsed, bool remove_expired) 1102 { 1103 size_t len; 1104 uint8_t *start = odhcp6c_get_state(state, &len); 1105 1106 for (struct odhcp6c_entry *c = (struct odhcp6c_entry*)start; 1107 (uint8_t*)c < &start[len] && 1108 (uint8_t*)odhcp6c_next_entry(c) <= &start[len]; 1109 ) { 1110 if (c->t1 < elapsed) 1111 c->t1 = 0; 1112 else if (c->t1 != UINT32_MAX) 1113 c->t1 -= elapsed; 1114 1115 if (c->t2 < elapsed) 1116 c->t2 = 0; 1117 else if (c->t2 != UINT32_MAX) 1118 c->t2 -= elapsed; 1119 1120 if (c->preferred < elapsed) 1121 c->preferred = 0; 1122 else if (c->preferred != UINT32_MAX) 1123 c->preferred -= elapsed; 1124 1125 if (c->valid < elapsed) 1126 c->valid = 0; 1127 else if (c->valid != UINT32_MAX) 1128 c->valid -= elapsed; 1129 1130 if (!c->valid && remove_expired) { 1131 odhcp6c_remove_state(state, ((uint8_t*)c) - start, odhcp6c_entry_size(c)); 1132 start = odhcp6c_get_state(state, &len); 1133 } else { 1134 c = odhcp6c_next_entry(c); 1135 } 1136 } 1137 } 1138 1139 void odhcp6c_expire(bool expire_ia_pd) 1140 { 1141 time_t now = odhcp6c_get_milli_time() / 1000; 1142 uint32_t elapsed = (last_update > 0) ? now - last_update : 0; 1143 1144 last_update = now; 1145 1146 odhcp6c_expire_list(STATE_RA_PREFIX, elapsed, true); 1147 odhcp6c_expire_list(STATE_RA_ROUTE, elapsed, true); 1148 odhcp6c_expire_list(STATE_RA_DNS, elapsed, true); 1149 odhcp6c_expire_list(STATE_RA_SEARCH, elapsed, true); 1150 odhcp6c_expire_list(STATE_IA_NA, elapsed, true); 1151 odhcp6c_expire_list(STATE_IA_PD, elapsed, expire_ia_pd); 1152 } 1153 1154 uint32_t odhcp6c_elapsed(void) 1155 { 1156 return odhcp6c_get_milli_time() / 1000 - last_update; 1157 } 1158 1159 int odhcp6c_random(void *buf, size_t len) 1160 { 1161 return read(urandom_fd, buf, len); 1162 } 1163 1164 bool odhcp6c_is_bound(void) 1165 { 1166 return bound; 1167 } 1168 1169 bool odhcp6c_addr_in_scope(const struct in6_addr *addr) 1170 { 1171 FILE *fd = fopen("/proc/net/if_inet6", "r"); 1172 int len; 1173 bool ret = false; 1174 char buf[256]; 1175 1176 if (fd == NULL) 1177 return false; 1178 1179 while (fgets(buf, sizeof(buf), fd)) { 1180 struct in6_addr inet6_addr; 1181 uint32_t flags, dummy; 1182 unsigned int i; 1183 char name[IF_NAMESIZE], addr_buf[33]; 1184 1185 len = strlen(buf); 1186 1187 if ((len <= 0) || buf[len - 1] != '\n') 1188 break; 1189 1190 buf[--len] = '\0'; 1191 1192 if (sscanf(buf, "%s %x %x %x %x %s", 1193 addr_buf, &dummy, &dummy, &dummy, &flags, name) != 6) 1194 break; 1195 1196 if (strcmp(name, ifname) || 1197 (flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE | IFA_F_DEPRECATED))) 1198 continue; 1199 1200 size_t addr_len = strlen(addr_buf); 1201 bool valid = (addr_len == 2 * sizeof(inet6_addr.s6_addr)); 1202 1203 for (i = 0; valid && i < addr_len; i++) { 1204 if (!isxdigit((unsigned char)addr_buf[i]) || 1205 isupper((unsigned char)addr_buf[i])) 1206 valid = false; 1207 } 1208 1209 if (!valid) 1210 continue; 1211 1212 memset(&inet6_addr, 0, sizeof(inet6_addr)); 1213 for (i = 0; i < (addr_len / 2); i++) { 1214 unsigned char byte; 1215 static const char hex[] = "0123456789abcdef"; 1216 byte = ((index(hex, addr_buf[i * 2]) - hex) << 4) | 1217 (index(hex, addr_buf[i * 2 + 1]) - hex); 1218 inet6_addr.s6_addr[i] = byte; 1219 } 1220 1221 if ((IN6_IS_ADDR_LINKLOCAL(&inet6_addr) == IN6_IS_ADDR_LINKLOCAL(addr)) && 1222 (IN6_IS_ADDR_UNIQUELOCAL(&inet6_addr) == IN6_IS_ADDR_UNIQUELOCAL(addr))) { 1223 ret = true; 1224 break; 1225 } 1226 } 1227 1228 fclose(fd); 1229 return ret; 1230 } 1231 1232 static void sighandler(int signal) 1233 { 1234 if (signal == SIGUSR1) 1235 signal_usr1 = true; 1236 else if (signal == SIGUSR2) 1237 signal_usr2 = true; 1238 else if (signal == SIGIO) 1239 signal_io = true; 1240 else 1241 signal_term = true; 1242 } 1243 1244 void notify_state_change(const char *status, int delay, bool resume) 1245 { 1246 script_call(status, delay, resume); 1247 1248 #ifdef WITH_UBUS 1249 ubus_dhcp_event(status); 1250 #endif /* WITH_UBUS */ 1251 } 1252 1253 struct odhcp6c_opt *odhcp6c_find_opt(const uint16_t code) 1254 { 1255 struct odhcp6c_opt *opt = opts; 1256 1257 while (opt->code) { 1258 if (opt->code == code) 1259 return opt; 1260 1261 opt++; 1262 } 1263 1264 return NULL; 1265 } 1266 1267 struct odhcp6c_opt *odhcp6c_find_opt_by_name(const char *name) 1268 { 1269 struct odhcp6c_opt *opt = opts; 1270 1271 if (!name || !strlen(name)) 1272 return NULL; 1273 1274 while (opt->code && (!opt->str || strcmp(opt->str, name))) 1275 opt++; 1276 1277 return (opt->code > 0 ? opt : NULL); 1278 } 1279
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