1 /* SPDX-License-Identifier: BSD-2-Clause */ 2 /* 3 * dhcpcd - DHCP client daemon 4 * Copyright (c) 2006-2021 Roy Marples <roy@marples.name> 5 * All rights reserved 6 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 static const char dhcpcd_copyright[] = "Copyright (c) 2006-2021 Roy Marples"; 30 31 #include <sys/file.h> 32 #include <sys/ioctl.h> 33 #include <sys/socket.h> 34 #include <sys/stat.h> 35 #include <sys/time.h> 36 #include <sys/types.h> 37 #include <sys/uio.h> 38 #include <sys/wait.h> 39 40 #include <ctype.h> 41 #include <errno.h> 42 #include <fcntl.h> 43 #include <getopt.h> 44 #include <limits.h> 45 #include <paths.h> 46 #include <signal.h> 47 #include <stdio.h> 48 #include <stdlib.h> 49 #include <string.h> 50 #include <syslog.h> 51 #include <unistd.h> 52 #include <time.h> 53 54 #include "config.h" 55 #include "arp.h" 56 #include "common.h" 57 #include "control.h" 58 #include "dev.h" 59 #include "dhcp-common.h" 60 #include "dhcpcd.h" 61 #include "dhcp.h" 62 #include "dhcp6.h" 63 #include "duid.h" 64 #include "eloop.h" 65 #include "if.h" 66 #include "if-options.h" 67 #include "ipv4.h" 68 #include "ipv4ll.h" 69 #include "ipv6.h" 70 #include "ipv6nd.h" 71 #include "logerr.h" 72 #include "privsep.h" 73 #include "script.h" 74 75 #ifdef HAVE_CAPSICUM 76 #include <sys/capsicum.h> 77 #endif 78 #ifdef HAVE_UTIL_H 79 #include <util.h> 80 #endif 81 82 #ifdef USE_SIGNALS 83 const int dhcpcd_signals[] = { 84 SIGTERM, 85 SIGINT, 86 SIGALRM, 87 SIGHUP, 88 SIGUSR1, 89 SIGUSR2, 90 SIGCHLD, 91 }; 92 const size_t dhcpcd_signals_len = __arraycount(dhcpcd_signals); 93 94 const int dhcpcd_signals_ignore[] = { 95 SIGPIPE, 96 }; 97 const size_t dhcpcd_signals_ignore_len = __arraycount(dhcpcd_signals_ignore); 98 #endif 99 100 const char *dhcpcd_default_script = SCRIPT; 101 102 static void 103 usage(void) 104 { 105 106 printf("usage: "PACKAGE"\t[-146ABbDdEGgHJKLMNPpqTV]\n" 107 "\t\t[-C, --nohook hook] [-c, --script script]\n" 108 "\t\t[-e, --env value] [-F, --fqdn FQDN] [-f, --config file]\n" 109 "\t\t[-h, --hostname hostname] [-I, --clientid clientid]\n" 110 "\t\t[-i, --vendorclassid vendorclassid] [-j, --logfile logfile]\n" 111 "\t\t[-l, --leasetime seconds] [-m, --metric metric]\n" 112 "\t\t[-O, --nooption option] [-o, --option option]\n" 113 "\t\t[-Q, --require option] [-r, --request address]\n" 114 "\t\t[-S, --static value]\n" 115 "\t\t[-s, --inform address[/cidr[/broadcast_address]]]\n [--inform6]" 116 "\t\t[-t, --timeout seconds] [-u, --userclass class]\n" 117 "\t\t[-v, --vendor code, value] [-W, --whitelist address[/cidr]] [-w]\n" 118 "\t\t[--waitip [4 | 6]] [-y, --reboot seconds]\n" 119 "\t\t[-X, --blacklist address[/cidr]] [-Z, --denyinterfaces pattern]\n" 120 "\t\t[-z, --allowinterfaces pattern] [--inactive] [interface] [...]\n" 121 " "PACKAGE"\t-n, --rebind [interface]\n" 122 " "PACKAGE"\t-k, --release [interface]\n" 123 " "PACKAGE"\t-U, --dumplease interface\n" 124 " "PACKAGE"\t--version\n" 125 " "PACKAGE"\t-x, --exit [interface]\n"); 126 } 127 128 static void 129 free_globals(struct dhcpcd_ctx *ctx) 130 { 131 struct dhcp_opt *opt; 132 133 if (ctx->ifac) { 134 for (; ctx->ifac > 0; ctx->ifac--) 135 free(ctx->ifav[ctx->ifac - 1]); 136 free(ctx->ifav); 137 ctx->ifav = NULL; 138 } 139 if (ctx->ifdc) { 140 for (; ctx->ifdc > 0; ctx->ifdc--) 141 free(ctx->ifdv[ctx->ifdc - 1]); 142 free(ctx->ifdv); 143 ctx->ifdv = NULL; 144 } 145 if (ctx->ifcc) { 146 for (; ctx->ifcc > 0; ctx->ifcc--) 147 free(ctx->ifcv[ctx->ifcc - 1]); 148 free(ctx->ifcv); 149 ctx->ifcv = NULL; 150 } 151 152 #ifdef INET 153 if (ctx->dhcp_opts) { 154 for (opt = ctx->dhcp_opts; 155 ctx->dhcp_opts_len > 0; 156 opt++, ctx->dhcp_opts_len--) 157 free_dhcp_opt_embenc(opt); 158 free(ctx->dhcp_opts); 159 ctx->dhcp_opts = NULL; 160 } 161 #endif 162 #ifdef INET6 163 if (ctx->nd_opts) { 164 for (opt = ctx->nd_opts; 165 ctx->nd_opts_len > 0; 166 opt++, ctx->nd_opts_len--) 167 free_dhcp_opt_embenc(opt); 168 free(ctx->nd_opts); 169 ctx->nd_opts = NULL; 170 } 171 #ifdef DHCP6 172 if (ctx->dhcp6_opts) { 173 for (opt = ctx->dhcp6_opts; 174 ctx->dhcp6_opts_len > 0; 175 opt++, ctx->dhcp6_opts_len--) 176 free_dhcp_opt_embenc(opt); 177 free(ctx->dhcp6_opts); 178 ctx->dhcp6_opts = NULL; 179 } 180 #endif 181 #endif 182 if (ctx->vivso) { 183 for (opt = ctx->vivso; 184 ctx->vivso_len > 0; 185 opt++, ctx->vivso_len--) 186 free_dhcp_opt_embenc(opt); 187 free(ctx->vivso); 188 ctx->vivso = NULL; 189 } 190 } 191 192 static void 193 handle_exit_timeout(void *arg) 194 { 195 struct dhcpcd_ctx *ctx; 196 197 ctx = arg; 198 logerrx("timed out"); 199 if (!(ctx->options & DHCPCD_MANAGER)) { 200 struct interface *ifp; 201 202 TAILQ_FOREACH(ifp, ctx->ifaces, next) { 203 if (ifp->active == IF_ACTIVE_USER) 204 script_runreason(ifp, "STOPPED"); 205 } 206 eloop_exit(ctx->eloop, EXIT_FAILURE); 207 return; 208 } 209 ctx->options |= DHCPCD_NOWAITIP; 210 dhcpcd_daemonise(ctx); 211 } 212 213 static const char * 214 dhcpcd_af(int af) 215 { 216 217 switch (af) { 218 case AF_UNSPEC: 219 return "IP"; 220 case AF_INET: 221 return "IPv4"; 222 case AF_INET6: 223 return "IPv6"; 224 default: 225 return NULL; 226 } 227 } 228 229 int 230 dhcpcd_ifafwaiting(const struct interface *ifp) 231 { 232 unsigned long long opts; 233 bool foundany = false; 234 235 if (ifp->active != IF_ACTIVE_USER) 236 return AF_MAX; 237 238 #define DHCPCD_WAITALL (DHCPCD_WAITIP4 | DHCPCD_WAITIP6) 239 opts = ifp->options->options; 240 #ifdef INET 241 if (opts & DHCPCD_WAITIP4 || 242 (opts & DHCPCD_WAITIP && !(opts & DHCPCD_WAITALL))) 243 { 244 bool foundaddr = ipv4_hasaddr(ifp); 245 246 if (opts & DHCPCD_WAITIP4 && !foundaddr) 247 return AF_INET; 248 if (foundaddr) 249 foundany = true; 250 } 251 #endif 252 #ifdef INET6 253 if (opts & DHCPCD_WAITIP6 || 254 (opts & DHCPCD_WAITIP && !(opts & DHCPCD_WAITALL))) 255 { 256 bool foundaddr = ipv6_hasaddr(ifp); 257 258 if (opts & DHCPCD_WAITIP6 && !foundaddr) 259 return AF_INET; 260 if (foundaddr) 261 foundany = true; 262 } 263 #endif 264 265 if (opts & DHCPCD_WAITIP && !(opts & DHCPCD_WAITALL) && !foundany) 266 return AF_UNSPEC; 267 return AF_MAX; 268 } 269 270 int 271 dhcpcd_afwaiting(const struct dhcpcd_ctx *ctx) 272 { 273 unsigned long long opts; 274 const struct interface *ifp; 275 int af; 276 277 if (!(ctx->options & DHCPCD_WAITOPTS)) 278 return AF_MAX; 279 280 opts = ctx->options; 281 TAILQ_FOREACH(ifp, ctx->ifaces, next) { 282 #ifdef INET 283 if (opts & (DHCPCD_WAITIP | DHCPCD_WAITIP4) && 284 ipv4_hasaddr(ifp)) 285 opts &= ~(DHCPCD_WAITIP | DHCPCD_WAITIP4); 286 #endif 287 #ifdef INET6 288 if (opts & (DHCPCD_WAITIP | DHCPCD_WAITIP6) && 289 ipv6_hasaddr(ifp)) 290 opts &= ~(DHCPCD_WAITIP | DHCPCD_WAITIP6); 291 #endif 292 if (!(opts & DHCPCD_WAITOPTS)) 293 break; 294 } 295 if (opts & DHCPCD_WAITIP) 296 af = AF_UNSPEC; 297 else if (opts & DHCPCD_WAITIP4) 298 af = AF_INET; 299 else if (opts & DHCPCD_WAITIP6) 300 af = AF_INET6; 301 else 302 return AF_MAX; 303 return af; 304 } 305 306 static int 307 dhcpcd_ipwaited(struct dhcpcd_ctx *ctx) 308 { 309 struct interface *ifp; 310 int af; 311 312 TAILQ_FOREACH(ifp, ctx->ifaces, next) { 313 if ((af = dhcpcd_ifafwaiting(ifp)) != AF_MAX) { 314 logdebugx("%s: waiting for an %s address", 315 ifp->name, dhcpcd_af(af)); 316 return 0; 317 } 318 } 319 320 if ((af = dhcpcd_afwaiting(ctx)) != AF_MAX) { 321 logdebugx("waiting for an %s address", 322 dhcpcd_af(af)); 323 return 0; 324 } 325 326 return 1; 327 } 328 329 /* Returns the pid of the child, otherwise 0. */ 330 void 331 dhcpcd_daemonise(struct dhcpcd_ctx *ctx) 332 { 333 #ifdef THERE_IS_NO_FORK 334 eloop_timeout_delete(ctx->eloop, handle_exit_timeout, ctx); 335 errno = ENOSYS; 336 return; 337 #else 338 int i; 339 unsigned int logopts = loggetopts(); 340 341 if (ctx->options & DHCPCD_DAEMONISE && 342 !(ctx->options & (DHCPCD_DAEMONISED | DHCPCD_NOWAITIP))) 343 { 344 if (!dhcpcd_ipwaited(ctx)) 345 return; 346 } 347 348 if (ctx->options & DHCPCD_ONESHOT) { 349 loginfox("exiting due to oneshot"); 350 eloop_exit(ctx->eloop, EXIT_SUCCESS); 351 return; 352 } 353 354 eloop_timeout_delete(ctx->eloop, handle_exit_timeout, ctx); 355 if (ctx->options & DHCPCD_DAEMONISED || 356 !(ctx->options & DHCPCD_DAEMONISE)) 357 return; 358 359 /* Don't use loginfo because this makes no sense in a log. */ 360 if (!(logopts & LOGERR_QUIET) && ctx->stderr_valid) 361 (void)fprintf(stderr, 362 "forked to background, child pid %d\n", getpid()); 363 i = EXIT_SUCCESS; 364 if (write(ctx->fork_fd, &i, sizeof(i)) == -1) 365 logerr("write"); 366 ctx->options |= DHCPCD_DAEMONISED; 367 eloop_event_delete(ctx->eloop, ctx->fork_fd); 368 close(ctx->fork_fd); 369 ctx->fork_fd = -1; 370 371 /* 372 * Stop writing to stderr. 373 * On the happy path, only the manager process writes to stderr, 374 * so this just stops wasting fprintf calls to nowhere. 375 * All other calls - ie errors in privsep processes or script output, 376 * will error when printing. 377 * If we *really* want to fix that, then we need to suck 378 * stderr/stdout in the manager process and either disacrd it or pass 379 * it to the launcher process and then to stderr. 380 */ 381 logopts &= ~LOGERR_ERR; 382 logsetopts(logopts); 383 #endif 384 } 385 386 static void 387 dhcpcd_drop(struct interface *ifp, int stop) 388 { 389 390 #ifdef DHCP6 391 dhcp6_drop(ifp, stop ? NULL : "EXPIRE6"); 392 #endif 393 #ifdef INET6 394 ipv6nd_drop(ifp); 395 ipv6_drop(ifp); 396 #endif 397 #ifdef IPV4LL 398 ipv4ll_drop(ifp); 399 #endif 400 #ifdef INET 401 dhcp_drop(ifp, stop ? "STOP" : "EXPIRE"); 402 #endif 403 #ifdef ARP 404 arp_drop(ifp); 405 #endif 406 #if !defined(DHCP6) && !defined(DHCP) 407 UNUSED(stop); 408 #endif 409 } 410 411 static void 412 stop_interface(struct interface *ifp, const char *reason) 413 { 414 struct dhcpcd_ctx *ctx; 415 416 ctx = ifp->ctx; 417 loginfox("%s: removing interface", ifp->name); 418 ifp->options->options |= DHCPCD_STOPPING; 419 420 dhcpcd_drop(ifp, 1); 421 script_runreason(ifp, reason == NULL ? "STOPPED" : reason); 422 423 /* Delete all timeouts for the interfaces */ 424 eloop_q_timeout_delete(ctx->eloop, ELOOP_QUEUE_ALL, NULL, ifp); 425 426 /* De-activate the interface */ 427 ifp->active = IF_INACTIVE; 428 ifp->options->options &= ~DHCPCD_STOPPING; 429 430 if (!(ctx->options & (DHCPCD_MANAGER | DHCPCD_TEST))) 431 eloop_exit(ctx->eloop, EXIT_FAILURE); 432 } 433 434 static void 435 configure_interface1(struct interface *ifp) 436 { 437 struct if_options *ifo = ifp->options; 438 439 /* Do any platform specific configuration */ 440 if_conf(ifp); 441 442 /* If we want to release a lease, we can't really persist the 443 * address either. */ 444 if (ifo->options & DHCPCD_RELEASE) 445 ifo->options &= ~DHCPCD_PERSISTENT; 446 447 if (ifp->flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) { 448 ifo->options &= ~DHCPCD_ARP; 449 if (!(ifp->flags & IFF_MULTICAST)) 450 ifo->options &= ~DHCPCD_IPV6RS; 451 if (!(ifo->options & (DHCPCD_INFORM | DHCPCD_WANTDHCP))) 452 ifo->options |= DHCPCD_STATIC; 453 } 454 455 if (ifo->metric != -1) 456 ifp->metric = (unsigned int)ifo->metric; 457 458 #ifdef INET6 459 /* We want to setup INET6 on the interface as soon as possible. */ 460 if (ifp->active == IF_ACTIVE_USER && 461 ifo->options & DHCPCD_IPV6 && 462 !(ifp->ctx->options & (DHCPCD_DUMPLEASE | DHCPCD_TEST))) 463 { 464 /* If not doing any DHCP, disable the RDNSS requirement. */ 465 if (!(ifo->options & (DHCPCD_DHCP | DHCPCD_DHCP6))) 466 ifo->options &= ~DHCPCD_IPV6RA_REQRDNSS; 467 if_setup_inet6(ifp); 468 } 469 #endif 470 471 if (!(ifo->options & DHCPCD_IAID)) { 472 /* 473 * An IAID is for identifying a unqiue interface within 474 * the client. It is 4 bytes long. Working out a default 475 * value is problematic. 476 * 477 * Interface name and number are not stable 478 * between different OS's. Some OS's also cannot make 479 * up their mind what the interface should be called 480 * (yes, udev, I'm looking at you). 481 * Also, the name could be longer than 4 bytes. 482 * Also, with pluggable interfaces the name and index 483 * could easily get swapped per actual interface. 484 * 485 * The MAC address is 6 bytes long, the final 3 486 * being unique to the manufacturer and the initial 3 487 * being unique to the organisation which makes it. 488 * We could use the last 4 bytes of the MAC address 489 * as the IAID as it's the most stable part given the 490 * above, but equally it's not guaranteed to be 491 * unique. 492 * 493 * Given the above, and our need to reliably work 494 * between reboots without persitent storage, 495 * generating the IAID from the MAC address is the only 496 * logical default. 497 * Saying that, if a VLANID has been specified then we 498 * can use that. It's possible that different interfaces 499 * can have the same VLANID, but this is no worse than 500 * generating the IAID from the duplicate MAC address. 501 * 502 * dhclient uses the last 4 bytes of the MAC address. 503 * dibbler uses an increamenting counter. 504 * wide-dhcpv6 uses 0 or a configured value. 505 * odhcp6c uses 1. 506 * Windows 7 uses the first 3 bytes of the MAC address 507 * and an unknown byte. 508 * dhcpcd-6.1.0 and earlier used the interface name, 509 * falling back to interface index if name > 4. 510 */ 511 if (ifp->vlanid != 0) { 512 uint32_t vlanid; 513 514 /* Maximal VLANID is 4095, so prefix with 0xff 515 * so we don't conflict with an interface index. */ 516 vlanid = htonl(ifp->vlanid | 0xff000000); 517 memcpy(ifo->iaid, &vlanid, sizeof(vlanid)); 518 } else if (ifo->options & DHCPCD_ANONYMOUS) 519 memset(ifo->iaid, 0, sizeof(ifo->iaid)); 520 else if (ifp->hwlen >= sizeof(ifo->iaid)) { 521 memcpy(ifo->iaid, 522 ifp->hwaddr + ifp->hwlen - sizeof(ifo->iaid), 523 sizeof(ifo->iaid)); 524 } else { 525 uint32_t len; 526 527 len = (uint32_t)strlen(ifp->name); 528 if (len <= sizeof(ifo->iaid)) { 529 memcpy(ifo->iaid, ifp->name, len); 530 if (len < sizeof(ifo->iaid)) 531 memset(ifo->iaid + len, 0, 532 sizeof(ifo->iaid) - len); 533 } else { 534 /* IAID is the same size as a uint32_t */ 535 len = htonl(ifp->index); 536 memcpy(ifo->iaid, &len, sizeof(ifo->iaid)); 537 } 538 } 539 ifo->options |= DHCPCD_IAID; 540 } 541 542 #ifdef DHCP6 543 if (ifo->ia_len == 0 && ifo->options & DHCPCD_IPV6 && 544 ifp->name[0] != '\0') 545 { 546 ifo->ia = malloc(sizeof(*ifo->ia)); 547 if (ifo->ia == NULL) 548 logerr(__func__); 549 else { 550 ifo->ia_len = 1; 551 ifo->ia->ia_type = D6_OPTION_IA_NA; 552 memcpy(ifo->ia->iaid, ifo->iaid, sizeof(ifo->iaid)); 553 memset(&ifo->ia->addr, 0, sizeof(ifo->ia->addr)); 554 #ifndef SMALL 555 ifo->ia->sla = NULL; 556 ifo->ia->sla_len = 0; 557 #endif 558 } 559 } else { 560 size_t i; 561 562 for (i = 0; i < ifo->ia_len; i++) { 563 if (!ifo->ia[i].iaid_set) { 564 memcpy(&ifo->ia[i].iaid, ifo->iaid, 565 sizeof(ifo->ia[i].iaid)); 566 ifo->ia[i].iaid_set = 1; 567 } 568 } 569 } 570 #endif 571 572 /* If root is network mounted, we don't want to kill the connection 573 * if the DHCP server goes the way of the dodo OR dhcpcd is rebooting 574 * and the lease file has expired. */ 575 if (is_root_local() == 0) 576 ifo->options |= DHCPCD_LASTLEASE_EXTEND; 577 } 578 579 int 580 dhcpcd_selectprofile(struct interface *ifp, const char *profile) 581 { 582 struct if_options *ifo; 583 char pssid[PROFILE_LEN]; 584 585 if (ifp->ssid_len) { 586 ssize_t r; 587 588 r = print_string(pssid, sizeof(pssid), OT_ESCSTRING, 589 ifp->ssid, ifp->ssid_len); 590 if (r == -1) { 591 logerr(__func__); 592 pssid[0] = '\0'; 593 } 594 } else 595 pssid[0] = '\0'; 596 ifo = read_config(ifp->ctx, ifp->name, pssid, profile); 597 if (ifo == NULL) { 598 logdebugx("%s: no profile %s", ifp->name, profile); 599 return -1; 600 } 601 if (profile != NULL) { 602 strlcpy(ifp->profile, profile, sizeof(ifp->profile)); 603 loginfox("%s: selected profile %s", ifp->name, profile); 604 } else 605 *ifp->profile = '\0'; 606 607 free_options(ifp->ctx, ifp->options); 608 ifp->options = ifo; 609 if (profile) { 610 add_options(ifp->ctx, ifp->name, ifp->options, 611 ifp->ctx->argc, ifp->ctx->argv); 612 configure_interface1(ifp); 613 } 614 return 1; 615 } 616 617 static void 618 configure_interface(struct interface *ifp, int argc, char **argv, 619 unsigned long long options) 620 { 621 time_t old; 622 623 old = ifp->options ? ifp->options->mtime : 0; 624 dhcpcd_selectprofile(ifp, NULL); 625 if (ifp->options == NULL) { 626 /* dhcpcd cannot continue with this interface. */ 627 ifp->active = IF_INACTIVE; 628 return; 629 } 630 add_options(ifp->ctx, ifp->name, ifp->options, argc, argv); 631 ifp->options->options |= options; 632 configure_interface1(ifp); 633 634 /* If the mtime has changed drop any old lease */ 635 if (old != 0 && ifp->options->mtime != old) { 636 logwarnx("%s: config file changed, expiring leases", 637 ifp->name); 638 dhcpcd_drop(ifp, 0); 639 } 640 } 641 642 static void 643 dhcpcd_initstate2(struct interface *ifp, unsigned long long options) 644 { 645 struct if_options *ifo; 646 647 if (options) { 648 if ((ifo = default_config(ifp->ctx)) == NULL) { 649 logerr(__func__); 650 return; 651 } 652 ifo->options |= options; 653 free(ifp->options); 654 ifp->options = ifo; 655 } else 656 ifo = ifp->options; 657 658 #ifdef INET6 659 if (ifo->options & DHCPCD_IPV6 && ipv6_init(ifp->ctx) == -1) { 660 logerr(__func__); 661 ifo->options &= ~DHCPCD_IPV6; 662 } 663 #endif 664 } 665 666 static void 667 dhcpcd_initstate1(struct interface *ifp, int argc, char **argv, 668 unsigned long long options) 669 { 670 671 configure_interface(ifp, argc, argv, options); 672 if (ifp->active) 673 dhcpcd_initstate2(ifp, 0); 674 } 675 676 static void 677 dhcpcd_initstate(struct interface *ifp, unsigned long long options) 678 { 679 680 dhcpcd_initstate1(ifp, ifp->ctx->argc, ifp->ctx->argv, options); 681 } 682 683 static void 684 dhcpcd_reportssid(struct interface *ifp) 685 { 686 char pssid[IF_SSIDLEN * 4]; 687 688 if (print_string(pssid, sizeof(pssid), OT_ESCSTRING, 689 ifp->ssid, ifp->ssid_len) == -1) 690 { 691 logerr(__func__); 692 return; 693 } 694 695 loginfox("%s: connected to Access Point: %s", ifp->name, pssid); 696 } 697 698 static void 699 dhcpcd_nocarrier_roaming(struct interface *ifp) 700 { 701 702 loginfox("%s: carrier lost - roaming", ifp->name); 703 704 #ifdef ARP 705 arp_drop(ifp); 706 #endif 707 #ifdef INET 708 dhcp_abort(ifp); 709 #endif 710 #ifdef DHCP6 711 dhcp6_abort(ifp); 712 #endif 713 714 rt_build(ifp->ctx, AF_UNSPEC); 715 script_runreason(ifp, "NOCARRIER_ROAMING"); 716 } 717 718 void 719 dhcpcd_handlecarrier(struct interface *ifp, int carrier, unsigned int flags) 720 { 721 bool was_link_up = if_is_link_up(ifp); 722 bool was_roaming = if_roaming(ifp); 723 724 ifp->carrier = carrier; 725 ifp->flags = flags; 726 727 if (!if_is_link_up(ifp)) { 728 if (!ifp->active || (!was_link_up && !was_roaming)) 729 return; 730 731 /* 732 * If the interface is roaming (generally on wireless) 733 * then while we are not up, we are not down either. 734 * Preserve the network state until we either disconnect 735 * or re-connect. 736 */ 737 if (!ifp->options->randomise_hwaddr && if_roaming(ifp)) { 738 dhcpcd_nocarrier_roaming(ifp); 739 return; 740 } 741 742 loginfox("%s: carrier lost", ifp->name); 743 script_runreason(ifp, "NOCARRIER"); 744 dhcpcd_drop(ifp, 0); 745 746 if (ifp->options->randomise_hwaddr) { 747 bool is_up = ifp->flags & IFF_UP; 748 749 if (is_up) 750 if_down(ifp); 751 if (if_randomisemac(ifp) == -1 && errno != ENXIO) 752 logerr(__func__); 753 if (is_up) 754 if_up(ifp); 755 } 756 757 return; 758 } 759 760 /* 761 * At this point carrier is NOT DOWN and we have IFF_UP. 762 * We should treat LINK_UNKNOWN as up as the driver may not support 763 * link state changes. 764 * The consideration of any other information about carrier should 765 * be handled in the OS specific if_carrier() function. 766 */ 767 if (was_link_up) 768 return; 769 770 if (ifp->active) { 771 if (carrier == LINK_UNKNOWN) 772 loginfox("%s: carrier unknown, assuming up", ifp->name); 773 else 774 loginfox("%s: carrier acquired", ifp->name); 775 } 776 777 #if !defined(__linux__) && !defined(__NetBSD__) 778 /* BSD does not emit RTM_NEWADDR or RTM_CHGADDR when the 779 * hardware address changes so we have to go 780 * through the disovery process to work it out. */ 781 dhcpcd_handleinterface(ifp->ctx, 0, ifp->name); 782 #endif 783 784 if (ifp->wireless) { 785 uint8_t ossid[IF_SSIDLEN]; 786 size_t olen; 787 788 olen = ifp->ssid_len; 789 memcpy(ossid, ifp->ssid, ifp->ssid_len); 790 if_getssid(ifp); 791 792 /* If we changed SSID network, drop leases */ 793 if ((ifp->ssid_len != olen || 794 memcmp(ifp->ssid, ossid, ifp->ssid_len)) && ifp->active) 795 { 796 dhcpcd_reportssid(ifp); 797 dhcpcd_drop(ifp, 0); 798 #ifdef IPV4LL 799 ipv4ll_reset(ifp); 800 #endif 801 } 802 } 803 804 if (!ifp->active) 805 return; 806 807 dhcpcd_initstate(ifp, 0); 808 script_runreason(ifp, "CARRIER"); 809 810 #ifdef INET6 811 /* Set any IPv6 Routers we remembered to expire faster than they 812 * would normally as we maybe on a new network. */ 813 ipv6nd_startexpire(ifp); 814 #ifdef IPV6_MANAGETEMPADDR 815 /* RFC4941 Section 3.5 */ 816 ipv6_regentempaddrs(ifp); 817 #endif 818 #endif 819 820 dhcpcd_startinterface(ifp); 821 } 822 823 static void 824 warn_iaid_conflict(struct interface *ifp, uint16_t ia_type, uint8_t *iaid) 825 { 826 struct interface *ifn; 827 #ifdef INET6 828 size_t i; 829 struct if_ia *ia; 830 #endif 831 832 TAILQ_FOREACH(ifn, ifp->ctx->ifaces, next) { 833 if (ifn == ifp || !ifn->active) 834 continue; 835 if (ifn->options->options & DHCPCD_ANONYMOUS) 836 continue; 837 if (ia_type == 0 && 838 memcmp(ifn->options->iaid, iaid, 839 sizeof(ifn->options->iaid)) == 0) 840 break; 841 #ifdef INET6 842 for (i = 0; i < ifn->options->ia_len; i++) { 843 ia = &ifn->options->ia[i]; 844 if (ia->ia_type == ia_type && 845 memcmp(ia->iaid, iaid, sizeof(ia->iaid)) == 0) 846 break; 847 } 848 #endif 849 } 850 851 /* This is only a problem if the interfaces are on the same network. */ 852 if (ifn) 853 logerrx("%s: IAID conflicts with one assigned to %s", 854 ifp->name, ifn->name); 855 } 856 857 static void 858 dhcpcd_initduid(struct dhcpcd_ctx *ctx, struct interface *ifp) 859 { 860 char buf[DUID_LEN * 3]; 861 862 if (ctx->duid != NULL) { 863 if (ifp == NULL) 864 goto log; 865 return; 866 } 867 868 duid_init(ctx, ifp); 869 if (ctx->duid == NULL) 870 return; 871 872 log: 873 loginfox("DUID %s", 874 hwaddr_ntoa(ctx->duid, ctx->duid_len, buf, sizeof(buf))); 875 } 876 877 void 878 dhcpcd_startinterface(void *arg) 879 { 880 struct interface *ifp = arg; 881 struct if_options *ifo = ifp->options; 882 883 if (ifo->options & DHCPCD_LINK && !if_is_link_up(ifp)) { 884 loginfox("%s: waiting for carrier", ifp->name); 885 return; 886 } 887 888 if (ifo->options & (DHCPCD_DUID | DHCPCD_IPV6) && 889 !(ifo->options & DHCPCD_ANONYMOUS)) 890 { 891 char buf[sizeof(ifo->iaid) * 3]; 892 #ifdef INET6 893 size_t i; 894 struct if_ia *ia; 895 #endif 896 897 /* Try and init DUID from the interface hardware address */ 898 dhcpcd_initduid(ifp->ctx, ifp); 899 900 /* Report IAIDs */ 901 loginfox("%s: IAID %s", ifp->name, 902 hwaddr_ntoa(ifo->iaid, sizeof(ifo->iaid), 903 buf, sizeof(buf))); 904 warn_iaid_conflict(ifp, 0, ifo->iaid); 905 906 #ifdef INET6 907 for (i = 0; i < ifo->ia_len; i++) { 908 ia = &ifo->ia[i]; 909 if (memcmp(ifo->iaid, ia->iaid, sizeof(ifo->iaid))) { 910 loginfox("%s: IA type %u IAID %s", 911 ifp->name, ia->ia_type, 912 hwaddr_ntoa(ia->iaid, sizeof(ia->iaid), 913 buf, sizeof(buf))); 914 warn_iaid_conflict(ifp, ia->ia_type, ia->iaid); 915 } 916 } 917 #endif 918 } 919 920 #ifdef INET6 921 if (ifo->options & DHCPCD_IPV6 && ipv6_start(ifp) == -1) { 922 logerr("%s: ipv6_start", ifp->name); 923 ifo->options &= ~DHCPCD_IPV6; 924 } 925 926 if (ifo->options & DHCPCD_IPV6) { 927 if (ifp->active == IF_ACTIVE_USER) { 928 ipv6_startstatic(ifp); 929 930 if (ifo->options & DHCPCD_IPV6RS) 931 ipv6nd_startrs(ifp); 932 } 933 934 #ifdef DHCP6 935 /* DHCPv6 could be turned off, but the interface 936 * is still delegated to. */ 937 if (ifp->active) 938 dhcp6_find_delegates(ifp); 939 940 if (ifo->options & DHCPCD_DHCP6) { 941 if (ifp->active == IF_ACTIVE_USER) { 942 enum DH6S d6_state; 943 944 if (ifo->options & DHCPCD_IA_FORCED) 945 d6_state = DH6S_INIT; 946 else if (ifo->options & DHCPCD_INFORM6) 947 d6_state = DH6S_INFORM; 948 else 949 d6_state = DH6S_CONFIRM; 950 if (dhcp6_start(ifp, d6_state) == -1) 951 logerr("%s: dhcp6_start", ifp->name); 952 } 953 } 954 #endif 955 } 956 #endif 957 958 #ifdef INET 959 if (ifo->options & DHCPCD_IPV4 && ifp->active == IF_ACTIVE_USER) { 960 /* Ensure we have an IPv4 state before starting DHCP */ 961 if (ipv4_getstate(ifp) != NULL) 962 dhcp_start(ifp); 963 } 964 #endif 965 } 966 967 static void 968 dhcpcd_prestartinterface(void *arg) 969 { 970 struct interface *ifp = arg; 971 struct dhcpcd_ctx *ctx = ifp->ctx; 972 bool randmac_down; 973 974 if (ifp->carrier <= LINK_DOWN && 975 ifp->options->randomise_hwaddr && 976 ifp->flags & IFF_UP) 977 { 978 if_down(ifp); 979 randmac_down = true; 980 } else 981 randmac_down = false; 982 983 if ((!(ctx->options & DHCPCD_MANAGER) || 984 ifp->options->options & DHCPCD_IF_UP || randmac_down) && 985 !(ifp->flags & IFF_UP)) 986 { 987 if (ifp->options->randomise_hwaddr && 988 if_randomisemac(ifp) == -1) 989 logerr(__func__); 990 if (if_up(ifp) == -1) 991 logerr(__func__); 992 } 993 994 dhcpcd_startinterface(ifp); 995 } 996 997 static void 998 run_preinit(struct interface *ifp) 999 { 1000 1001 if (ifp->ctx->options & DHCPCD_TEST) 1002 return; 1003 1004 script_runreason(ifp, "PREINIT"); 1005 if (ifp->wireless && if_is_link_up(ifp)) 1006 dhcpcd_reportssid(ifp); 1007 if (ifp->options->options & DHCPCD_LINK && ifp->carrier != LINK_UNKNOWN) 1008 script_runreason(ifp, 1009 ifp->carrier == LINK_UP ? "CARRIER" : "NOCARRIER"); 1010 } 1011 1012 void 1013 dhcpcd_activateinterface(struct interface *ifp, unsigned long long options) 1014 { 1015 1016 if (ifp->active) 1017 return; 1018 1019 ifp->active = IF_ACTIVE; 1020 dhcpcd_initstate2(ifp, options); 1021 1022 /* It's possible we might not have been able to load 1023 * a config. */ 1024 if (!ifp->active) 1025 return; 1026 1027 configure_interface1(ifp); 1028 run_preinit(ifp); 1029 dhcpcd_prestartinterface(ifp); 1030 } 1031 1032 int 1033 dhcpcd_handleinterface(void *arg, int action, const char *ifname) 1034 { 1035 struct dhcpcd_ctx *ctx = arg; 1036 struct ifaddrs *ifaddrs; 1037 struct if_head *ifs; 1038 struct interface *ifp, *iff; 1039 const char * const argv[] = { ifname }; 1040 int e; 1041 1042 if (action == -1) { 1043 ifp = if_find(ctx->ifaces, ifname); 1044 if (ifp == NULL) { 1045 errno = ESRCH; 1046 return -1; 1047 } 1048 if (ifp->active) { 1049 logdebugx("%s: interface departed", ifp->name); 1050 stop_interface(ifp, "DEPARTED"); 1051 } 1052 TAILQ_REMOVE(ctx->ifaces, ifp, next); 1053 if_free(ifp); 1054 return 0; 1055 } 1056 1057 ifs = if_discover(ctx, &ifaddrs, -1, UNCONST(argv)); 1058 if (ifs == NULL) { 1059 logerr(__func__); 1060 return -1; 1061 } 1062 1063 ifp = if_find(ifs, ifname); 1064 if (ifp == NULL) { 1065 /* This can happen if an interface is quickly added 1066 * and then removed. */ 1067 errno = ENOENT; 1068 e = -1; 1069 goto out; 1070 } 1071 e = 1; 1072 1073 /* Check if we already have the interface */ 1074 iff = if_find(ctx->ifaces, ifp->name); 1075 1076 if (iff != NULL) { 1077 if (iff->active) 1078 logdebugx("%s: interface updated", iff->name); 1079 /* The flags and hwaddr could have changed */ 1080 iff->flags = ifp->flags; 1081 iff->hwlen = ifp->hwlen; 1082 if (ifp->hwlen != 0) 1083 memcpy(iff->hwaddr, ifp->hwaddr, iff->hwlen); 1084 } else { 1085 TAILQ_REMOVE(ifs, ifp, next); 1086 TAILQ_INSERT_TAIL(ctx->ifaces, ifp, next); 1087 if (ifp->active) { 1088 logdebugx("%s: interface added", ifp->name); 1089 dhcpcd_initstate(ifp, 0); 1090 run_preinit(ifp); 1091 } 1092 iff = ifp; 1093 } 1094 1095 if (action > 0) { 1096 if_learnaddrs(ctx, ifs, &ifaddrs); 1097 if (iff->active) 1098 dhcpcd_prestartinterface(iff); 1099 } 1100 1101 out: 1102 /* Free our discovered list */ 1103 while ((ifp = TAILQ_FIRST(ifs))) { 1104 TAILQ_REMOVE(ifs, ifp, next); 1105 if_free(ifp); 1106 } 1107 free(ifs); 1108 1109 return e; 1110 } 1111 1112 static void 1113 dhcpcd_handlelink(void *arg) 1114 { 1115 struct dhcpcd_ctx *ctx = arg; 1116 1117 if (if_handlelink(ctx) == -1) { 1118 if (errno == ENOBUFS || errno == ENOMEM) { 1119 dhcpcd_linkoverflow(ctx); 1120 return; 1121 } 1122 if (errno != ENOTSUP) 1123 logerr(__func__); 1124 } 1125 } 1126 1127 static void 1128 dhcpcd_checkcarrier(void *arg) 1129 { 1130 struct interface *ifp0 = arg, *ifp; 1131 1132 ifp = if_find(ifp0->ctx->ifaces, ifp0->name); 1133 if (ifp == NULL || ifp->carrier == ifp0->carrier) 1134 return; 1135 1136 dhcpcd_handlecarrier(ifp, ifp0->carrier, ifp0->flags); 1137 if_free(ifp0); 1138 } 1139 1140 #ifndef SMALL 1141 static void 1142 dhcpcd_setlinkrcvbuf(struct dhcpcd_ctx *ctx) 1143 { 1144 socklen_t socklen; 1145 1146 if (ctx->link_rcvbuf == 0) 1147 return; 1148 1149 logdebugx("setting route socket receive buffer size to %d bytes", 1150 ctx->link_rcvbuf); 1151 1152 socklen = sizeof(ctx->link_rcvbuf); 1153 if (setsockopt(ctx->link_fd, SOL_SOCKET, 1154 SO_RCVBUF, &ctx->link_rcvbuf, socklen) == -1) 1155 logerr(__func__); 1156 } 1157 #endif 1158 1159 static void 1160 dhcpcd_runprestartinterface(void *arg) 1161 { 1162 struct interface *ifp = arg; 1163 1164 run_preinit(ifp); 1165 dhcpcd_prestartinterface(ifp); 1166 } 1167 1168 void 1169 dhcpcd_linkoverflow(struct dhcpcd_ctx *ctx) 1170 { 1171 socklen_t socklen; 1172 int rcvbuflen; 1173 char buf[2048]; 1174 ssize_t rlen; 1175 size_t rcnt; 1176 struct if_head *ifaces; 1177 struct ifaddrs *ifaddrs; 1178 struct interface *ifp, *ifn, *ifp1; 1179 1180 socklen = sizeof(rcvbuflen); 1181 if (getsockopt(ctx->link_fd, SOL_SOCKET, 1182 SO_RCVBUF, &rcvbuflen, &socklen) == -1) { 1183 logerr("%s: getsockopt", __func__); 1184 rcvbuflen = 0; 1185 } 1186 #ifdef __linux__ 1187 else 1188 rcvbuflen /= 2; 1189 #endif 1190 1191 logerrx("route socket overflowed (rcvbuflen %d)" 1192 " - learning interface state", rcvbuflen); 1193 1194 /* Drain the socket. 1195 * We cannot open a new one due to privsep. */ 1196 rcnt = 0; 1197 do { 1198 rlen = read(ctx->link_fd, buf, sizeof(buf)); 1199 if (++rcnt % 1000 == 0) 1200 logwarnx("drained %zu messages", rcnt); 1201 } while (rlen != -1 || errno == ENOBUFS || errno == ENOMEM); 1202 if (rcnt % 1000 != 0) 1203 logwarnx("drained %zu messages", rcnt); 1204 1205 /* Work out the current interfaces. */ 1206 ifaces = if_discover(ctx, &ifaddrs, ctx->ifc, ctx->ifv); 1207 if (ifaces == NULL) { 1208 logerr(__func__); 1209 return; 1210 } 1211 1212 /* Punt departed interfaces */ 1213 TAILQ_FOREACH_SAFE(ifp, ctx->ifaces, next, ifn) { 1214 if (if_find(ifaces, ifp->name) != NULL) 1215 continue; 1216 dhcpcd_handleinterface(ctx, -1, ifp->name); 1217 } 1218 1219 /* Add new interfaces */ 1220 while ((ifp = TAILQ_FIRST(ifaces)) != NULL ) { 1221 TAILQ_REMOVE(ifaces, ifp, next); 1222 ifp1 = if_find(ctx->ifaces, ifp->name); 1223 if (ifp1 != NULL) { 1224 /* If the interface already exists, 1225 * check carrier state. 1226 * dhcpcd_checkcarrier will free ifp. */ 1227 eloop_timeout_add_sec(ctx->eloop, 0, 1228 dhcpcd_checkcarrier, ifp); 1229 continue; 1230 } 1231 TAILQ_INSERT_TAIL(ctx->ifaces, ifp, next); 1232 if (ifp->active) { 1233 dhcpcd_initstate(ifp, 0); 1234 eloop_timeout_add_sec(ctx->eloop, 0, 1235 dhcpcd_runprestartinterface, ifp); 1236 } 1237 } 1238 free(ifaces); 1239 1240 /* Update address state. */ 1241 if_markaddrsstale(ctx->ifaces); 1242 if_learnaddrs(ctx, ctx->ifaces, &ifaddrs); 1243 if_deletestaleaddrs(ctx->ifaces); 1244 } 1245 1246 void 1247 dhcpcd_handlehwaddr(struct interface *ifp, 1248 uint16_t hwtype, const void *hwaddr, uint8_t hwlen) 1249 { 1250 char buf[sizeof(ifp->hwaddr) * 3]; 1251 1252 if (hwaddr == NULL || !if_valid_hwaddr(hwaddr, hwlen)) 1253 hwlen = 0; 1254 1255 if (hwlen > sizeof(ifp->hwaddr)) { 1256 errno = ENOBUFS; 1257 logerr("%s: %s", __func__, ifp->name); 1258 return; 1259 } 1260 1261 if (ifp->hwtype != hwtype) { 1262 if (ifp->active) 1263 loginfox("%s: hardware address type changed" 1264 " from %d to %d", ifp->name, ifp->hwtype, hwtype); 1265 ifp->hwtype = hwtype; 1266 } 1267 1268 if (ifp->hwlen == hwlen && 1269 (hwlen == 0 || memcmp(ifp->hwaddr, hwaddr, hwlen) == 0)) 1270 return; 1271 1272 if (ifp->active) { 1273 loginfox("%s: old hardware address: %s", ifp->name, 1274 hwaddr_ntoa(ifp->hwaddr, ifp->hwlen, buf, sizeof(buf))); 1275 loginfox("%s: new hardware address: %s", ifp->name, 1276 hwaddr_ntoa(hwaddr, hwlen, buf, sizeof(buf))); 1277 } 1278 ifp->hwlen = hwlen; 1279 if (hwaddr != NULL) 1280 memcpy(ifp->hwaddr, hwaddr, hwlen); 1281 } 1282 1283 static void 1284 if_reboot(struct interface *ifp, int argc, char **argv) 1285 { 1286 #ifdef INET 1287 unsigned long long oldopts; 1288 1289 oldopts = ifp->options->options; 1290 #endif 1291 script_runreason(ifp, "RECONFIGURE"); 1292 dhcpcd_initstate1(ifp, argc, argv, 0); 1293 #ifdef INET 1294 dhcp_reboot_newopts(ifp, oldopts); 1295 #endif 1296 #ifdef DHCP6 1297 dhcp6_reboot(ifp); 1298 #endif 1299 dhcpcd_prestartinterface(ifp); 1300 } 1301 1302 static void 1303 reload_config(struct dhcpcd_ctx *ctx) 1304 { 1305 struct if_options *ifo; 1306 1307 free_globals(ctx); 1308 if ((ifo = read_config(ctx, NULL, NULL, NULL)) == NULL) 1309 return; 1310 add_options(ctx, NULL, ifo, ctx->argc, ctx->argv); 1311 /* We need to preserve these options. */ 1312 if (ctx->options & DHCPCD_STARTED) 1313 ifo->options |= DHCPCD_STARTED; 1314 if (ctx->options & DHCPCD_MANAGER) 1315 ifo->options |= DHCPCD_MANAGER; 1316 if (ctx->options & DHCPCD_DAEMONISED) 1317 ifo->options |= DHCPCD_DAEMONISED; 1318 if (ctx->options & DHCPCD_PRIVSEP) 1319 ifo->options |= DHCPCD_PRIVSEP; 1320 ctx->options = ifo->options; 1321 free_options(ctx, ifo); 1322 } 1323 1324 static void 1325 reconf_reboot(struct dhcpcd_ctx *ctx, int action, int argc, char **argv, int oi) 1326 { 1327 int i; 1328 struct interface *ifp; 1329 1330 TAILQ_FOREACH(ifp, ctx->ifaces, next) { 1331 for (i = oi; i < argc; i++) { 1332 if (strcmp(ifp->name, argv[i]) == 0) 1333 break; 1334 } 1335 if (oi != argc && i == argc) 1336 continue; 1337 if (ifp->active == IF_ACTIVE_USER) { 1338 if (action) 1339 if_reboot(ifp, argc, argv); 1340 #ifdef INET 1341 else 1342 ipv4_applyaddr(ifp); 1343 #endif 1344 } else if (i != argc) { 1345 ifp->active = IF_ACTIVE_USER; 1346 dhcpcd_initstate1(ifp, argc, argv, 0); 1347 run_preinit(ifp); 1348 dhcpcd_prestartinterface(ifp); 1349 } 1350 } 1351 } 1352 1353 static void 1354 stop_all_interfaces(struct dhcpcd_ctx *ctx, unsigned long long opts) 1355 { 1356 struct interface *ifp; 1357 1358 ctx->options |= DHCPCD_EXITING; 1359 if (ctx->ifaces == NULL) 1360 return; 1361 1362 /* Drop the last interface first */ 1363 TAILQ_FOREACH_REVERSE(ifp, ctx->ifaces, if_head, next) { 1364 if (!ifp->active) 1365 continue; 1366 ifp->options->options |= opts; 1367 if (ifp->options->options & DHCPCD_RELEASE) 1368 ifp->options->options &= ~DHCPCD_PERSISTENT; 1369 ifp->options->options |= DHCPCD_EXITING; 1370 stop_interface(ifp, NULL); 1371 } 1372 } 1373 1374 static void 1375 dhcpcd_ifrenew(struct interface *ifp) 1376 { 1377 1378 if (!ifp->active) 1379 return; 1380 1381 if (ifp->options->options & DHCPCD_LINK && !if_is_link_up(ifp)) 1382 return; 1383 1384 #ifdef INET 1385 dhcp_renew(ifp); 1386 #endif 1387 #ifdef INET6 1388 #define DHCPCD_RARENEW (DHCPCD_IPV6 | DHCPCD_IPV6RS) 1389 if ((ifp->options->options & DHCPCD_RARENEW) == DHCPCD_RARENEW) 1390 ipv6nd_startrs(ifp); 1391 #endif 1392 #ifdef DHCP6 1393 dhcp6_renew(ifp); 1394 #endif 1395 } 1396 1397 static void 1398 dhcpcd_renew(struct dhcpcd_ctx *ctx) 1399 { 1400 struct interface *ifp; 1401 1402 TAILQ_FOREACH(ifp, ctx->ifaces, next) { 1403 dhcpcd_ifrenew(ifp); 1404 } 1405 } 1406 1407 #ifdef USE_SIGNALS 1408 #define sigmsg "received %s, %s" 1409 static void 1410 dhcpcd_signal_cb(int sig, void *arg) 1411 { 1412 struct dhcpcd_ctx *ctx = arg; 1413 unsigned long long opts; 1414 int exit_code; 1415 1416 if (ctx->options & DHCPCD_DUMPLEASE) { 1417 eloop_exit(ctx->eloop, EXIT_FAILURE); 1418 return; 1419 } 1420 1421 if (sig != SIGCHLD && ctx->options & DHCPCD_FORKED) { 1422 if (sig != SIGHUP && 1423 write(ctx->fork_fd, &sig, sizeof(sig)) == -1) 1424 logerr("%s: write", __func__); 1425 return; 1426 } 1427 1428 opts = 0; 1429 exit_code = EXIT_FAILURE; 1430 switch (sig) { 1431 case SIGINT: 1432 loginfox(sigmsg, "SIGINT", "stopping"); 1433 break; 1434 case SIGTERM: 1435 loginfox(sigmsg, "SIGTERM", "stopping"); 1436 exit_code = EXIT_SUCCESS; 1437 break; 1438 case SIGALRM: 1439 loginfox(sigmsg, "SIGALRM", "releasing"); 1440 opts |= DHCPCD_RELEASE; 1441 exit_code = EXIT_SUCCESS; 1442 break; 1443 case SIGHUP: 1444 loginfox(sigmsg, "SIGHUP", "rebinding"); 1445 reload_config(ctx); 1446 /* Preserve any options passed on the commandline 1447 * when we were started. */ 1448 reconf_reboot(ctx, 1, ctx->argc, ctx->argv, 1449 ctx->argc - ctx->ifc); 1450 return; 1451 case SIGUSR1: 1452 loginfox(sigmsg, "SIGUSR1", "renewing"); 1453 dhcpcd_renew(ctx); 1454 return; 1455 case SIGUSR2: 1456 loginfox(sigmsg, "SIGUSR2", "reopening log"); 1457 #ifdef PRIVSEP 1458 if (IN_PRIVSEP(ctx)) { 1459 if (ps_root_logreopen(ctx) == -1) 1460 logerr("ps_root_logreopen"); 1461 return; 1462 } 1463 #endif 1464 if (logopen(ctx->logfile) == -1) 1465 logerr("logopen"); 1466 return; 1467 case SIGCHLD: 1468 while (waitpid(-1, NULL, WNOHANG) > 0) 1469 ; 1470 return; 1471 default: 1472 logerrx("received signal %d but don't know what to do with it", 1473 sig); 1474 return; 1475 } 1476 1477 if (!(ctx->options & DHCPCD_TEST)) 1478 stop_all_interfaces(ctx, opts); 1479 eloop_exit(ctx->eloop, exit_code); 1480 } 1481 #endif 1482 1483 int 1484 dhcpcd_handleargs(struct dhcpcd_ctx *ctx, struct fd_list *fd, 1485 int argc, char **argv) 1486 { 1487 struct interface *ifp; 1488 unsigned long long opts; 1489 int opt, oi, do_reboot, do_renew, af = AF_UNSPEC; 1490 size_t len, l, nifaces; 1491 char *tmp, *p; 1492 1493 /* Special commands for our control socket 1494 * as the other end should be blocking until it gets the 1495 * expected reply we should be safely able just to change the 1496 * write callback on the fd */ 1497 /* Make any change here in privsep-control.c as well. */ 1498 if (strcmp(*argv, "--version") == 0) { 1499 return control_queue(fd, UNCONST(VERSION), 1500 strlen(VERSION) + 1); 1501 } else if (strcmp(*argv, "--getconfigfile") == 0) { 1502 return control_queue(fd, UNCONST(fd->ctx->cffile), 1503 strlen(fd->ctx->cffile) + 1); 1504 } else if (strcmp(*argv, "--getinterfaces") == 0) { 1505 optind = argc = 0; 1506 goto dumplease; 1507 } else if (strcmp(*argv, "--listen") == 0) { 1508 fd->flags |= FD_LISTEN; 1509 return 0; 1510 } 1511 1512 /* Log the command */ 1513 len = 1; 1514 for (opt = 0; opt < argc; opt++) 1515 len += strlen(argv[opt]) + 1; 1516 tmp = malloc(len); 1517 if (tmp == NULL) 1518 return -1; 1519 p = tmp; 1520 for (opt = 0; opt < argc; opt++) { 1521 l = strlen(argv[opt]); 1522 strlcpy(p, argv[opt], len); 1523 len -= l + 1; 1524 p += l; 1525 *p++ = ' '; 1526 } 1527 *--p = '\0'; 1528 loginfox("control command: %s", tmp); 1529 free(tmp); 1530 1531 optind = 0; 1532 oi = 0; 1533 opts = 0; 1534 do_reboot = do_renew = 0; 1535 while ((opt = getopt_long(argc, argv, IF_OPTS, cf_options, &oi)) != -1) 1536 { 1537 switch (opt) { 1538 case 'g': 1539 /* Assumed if below not set */ 1540 break; 1541 case 'k': 1542 opts |= DHCPCD_RELEASE; 1543 break; 1544 case 'n': 1545 do_reboot = 1; 1546 break; 1547 case 'p': 1548 opts |= DHCPCD_PERSISTENT; 1549 break; 1550 case 'x': 1551 opts |= DHCPCD_EXITING; 1552 break; 1553 case 'N': 1554 do_renew = 1; 1555 break; 1556 case 'U': 1557 opts |= DHCPCD_DUMPLEASE; 1558 break; 1559 case '4': 1560 af = AF_INET; 1561 break; 1562 case '6': 1563 af = AF_INET6; 1564 break; 1565 } 1566 } 1567 1568 if (opts & DHCPCD_DUMPLEASE) { 1569 ctx->options |= DHCPCD_DUMPLEASE; 1570 dumplease: 1571 nifaces = 0; 1572 TAILQ_FOREACH(ifp, ctx->ifaces, next) { 1573 if (!ifp->active) 1574 continue; 1575 for (oi = optind; oi < argc; oi++) { 1576 if (strcmp(ifp->name, argv[oi]) == 0) 1577 break; 1578 } 1579 if (optind == argc || oi < argc) { 1580 opt = send_interface(NULL, ifp, af); 1581 if (opt == -1) 1582 goto dumperr; 1583 nifaces += (size_t)opt; 1584 } 1585 } 1586 if (write(fd->fd, &nifaces, sizeof(nifaces)) != sizeof(nifaces)) 1587 goto dumperr; 1588 TAILQ_FOREACH(ifp, ctx->ifaces, next) { 1589 if (!ifp->active) 1590 continue; 1591 for (oi = optind; oi < argc; oi++) { 1592 if (strcmp(ifp->name, argv[oi]) == 0) 1593 break; 1594 } 1595 if (optind == argc || oi < argc) { 1596 if (send_interface(fd, ifp, af) == -1) 1597 goto dumperr; 1598 } 1599 } 1600 ctx->options &= ~DHCPCD_DUMPLEASE; 1601 return 0; 1602 dumperr: 1603 ctx->options &= ~DHCPCD_DUMPLEASE; 1604 return -1; 1605 } 1606 1607 /* Only privileged users can control dhcpcd via the socket. */ 1608 if (fd->flags & FD_UNPRIV) { 1609 errno = EPERM; 1610 return -1; 1611 } 1612 1613 if (opts & (DHCPCD_EXITING | DHCPCD_RELEASE)) { 1614 if (optind == argc) { 1615 stop_all_interfaces(ctx, opts); 1616 eloop_exit(ctx->eloop, EXIT_SUCCESS); 1617 return 0; 1618 } 1619 for (oi = optind; oi < argc; oi++) { 1620 if ((ifp = if_find(ctx->ifaces, argv[oi])) == NULL) 1621 continue; 1622 if (!ifp->active) 1623 continue; 1624 ifp->options->options |= opts; 1625 if (opts & DHCPCD_RELEASE) 1626 ifp->options->options &= ~DHCPCD_PERSISTENT; 1627 stop_interface(ifp, NULL); 1628 } 1629 return 0; 1630 } 1631 1632 if (do_renew) { 1633 if (optind == argc) { 1634 dhcpcd_renew(ctx); 1635 return 0; 1636 } 1637 for (oi = optind; oi < argc; oi++) { 1638 if ((ifp = if_find(ctx->ifaces, argv[oi])) == NULL) 1639 continue; 1640 dhcpcd_ifrenew(ifp); 1641 } 1642 return 0; 1643 } 1644 1645 reload_config(ctx); 1646 /* XXX: Respect initial commandline options? */ 1647 reconf_reboot(ctx, do_reboot, argc, argv, optind - 1); 1648 return 0; 1649 } 1650 1651 static void dhcpcd_readdump1(void *); 1652 1653 static void 1654 dhcpcd_readdump2(void *arg) 1655 { 1656 struct dhcpcd_ctx *ctx = arg; 1657 ssize_t len; 1658 int exit_code = EXIT_FAILURE; 1659 1660 len = read(ctx->control_fd, ctx->ctl_buf + ctx->ctl_bufpos, 1661 ctx->ctl_buflen - ctx->ctl_bufpos); 1662 if (len == -1) { 1663 logerr(__func__); 1664 goto finished; 1665 } else if (len == 0) 1666 goto finished; 1667 if ((size_t)len + ctx->ctl_bufpos != ctx->ctl_buflen) { 1668 ctx->ctl_bufpos += (size_t)len; 1669 return; 1670 } 1671 1672 if (ctx->ctl_buf[ctx->ctl_buflen - 1] != '\0') /* unlikely */ 1673 ctx->ctl_buf[ctx->ctl_buflen - 1] = '\0'; 1674 script_dump(ctx->ctl_buf, ctx->ctl_buflen); 1675 fflush(stdout); 1676 if (--ctx->ctl_extra != 0) { 1677 putchar('\n'); 1678 eloop_event_add(ctx->eloop, ctx->control_fd, 1679 dhcpcd_readdump1, ctx); 1680 return; 1681 } 1682 exit_code = EXIT_SUCCESS; 1683 1684 finished: 1685 shutdown(ctx->control_fd, SHUT_RDWR); 1686 eloop_exit(ctx->eloop, exit_code); 1687 } 1688 1689 static void 1690 dhcpcd_readdump1(void *arg) 1691 { 1692 struct dhcpcd_ctx *ctx = arg; 1693 ssize_t len; 1694 1695 len = read(ctx->control_fd, &ctx->ctl_buflen, sizeof(ctx->ctl_buflen)); 1696 if (len != sizeof(ctx->ctl_buflen)) { 1697 if (len != -1) 1698 errno = EINVAL; 1699 goto err; 1700 } 1701 if (ctx->ctl_buflen > SSIZE_MAX) { 1702 errno = ENOBUFS; 1703 goto err; 1704 } 1705 1706 free(ctx->ctl_buf); 1707 ctx->ctl_buf = malloc(ctx->ctl_buflen); 1708 if (ctx->ctl_buf == NULL) 1709 goto err; 1710 1711 ctx->ctl_bufpos = 0; 1712 eloop_event_add(ctx->eloop, ctx->control_fd, 1713 dhcpcd_readdump2, ctx); 1714 return; 1715 1716 err: 1717 logerr(__func__); 1718 eloop_exit(ctx->eloop, EXIT_FAILURE); 1719 } 1720 1721 static void 1722 dhcpcd_readdump0(void *arg) 1723 { 1724 struct dhcpcd_ctx *ctx = arg; 1725 ssize_t len; 1726 1727 len = read(ctx->control_fd, &ctx->ctl_extra, sizeof(ctx->ctl_extra)); 1728 if (len != sizeof(ctx->ctl_extra)) { 1729 if (len != -1) 1730 errno = EINVAL; 1731 logerr(__func__); 1732 eloop_exit(ctx->eloop, EXIT_FAILURE); 1733 return; 1734 } 1735 1736 if (ctx->ctl_extra == 0) { 1737 eloop_exit(ctx->eloop, EXIT_SUCCESS); 1738 return; 1739 } 1740 1741 eloop_event_add(ctx->eloop, ctx->control_fd, 1742 dhcpcd_readdump1, ctx); 1743 } 1744 1745 static void 1746 dhcpcd_readdumptimeout(void *arg) 1747 { 1748 struct dhcpcd_ctx *ctx = arg; 1749 1750 logerrx(__func__); 1751 eloop_exit(ctx->eloop, EXIT_FAILURE); 1752 } 1753 1754 static int 1755 dhcpcd_readdump(struct dhcpcd_ctx *ctx) 1756 { 1757 1758 ctx->options |= DHCPCD_FORKED; 1759 if (eloop_timeout_add_sec(ctx->eloop, 5, 1760 dhcpcd_readdumptimeout, ctx) == -1) 1761 return -1; 1762 return eloop_event_add(ctx->eloop, ctx->control_fd, 1763 dhcpcd_readdump0, ctx); 1764 } 1765 1766 static void 1767 dhcpcd_fork_cb(void *arg) 1768 { 1769 struct dhcpcd_ctx *ctx = arg; 1770 int exit_code; 1771 ssize_t len; 1772 1773 len = read(ctx->fork_fd, &exit_code, sizeof(exit_code)); 1774 if (len == -1) { 1775 logerr(__func__); 1776 exit_code = EXIT_FAILURE; 1777 } else if ((size_t)len < sizeof(exit_code)) { 1778 logerrx("%s: truncated read %zd (expected %zu)", 1779 __func__, len, sizeof(exit_code)); 1780 exit_code = EXIT_FAILURE; 1781 } 1782 if (ctx->options & DHCPCD_FORKED) 1783 eloop_exit(ctx->eloop, exit_code); 1784 else 1785 dhcpcd_signal_cb(exit_code, ctx); 1786 } 1787 1788 static void 1789 dhcpcd_stderr_cb(void *arg) 1790 { 1791 struct dhcpcd_ctx *ctx = arg; 1792 char log[BUFSIZ]; 1793 ssize_t len; 1794 1795 len = read(ctx->stderr_fd, log, sizeof(log)); 1796 if (len == -1) { 1797 if (errno != ECONNRESET) 1798 logerr(__func__); 1799 return; 1800 } 1801 1802 log[len] = '\0'; 1803 fprintf(stderr, "%s", log); 1804 } 1805 1806 int 1807 main(int argc, char **argv, char **envp) 1808 { 1809 struct dhcpcd_ctx ctx; 1810 struct ifaddrs *ifaddrs = NULL; 1811 struct if_options *ifo; 1812 struct interface *ifp; 1813 sa_family_t family = AF_UNSPEC; 1814 int opt, oi = 0, i; 1815 unsigned int logopts, t; 1816 ssize_t len; 1817 #if defined(USE_SIGNALS) || !defined(THERE_IS_NO_FORK) 1818 pid_t pid; 1819 int fork_fd[2], stderr_fd[2]; 1820 #endif 1821 #ifdef USE_SIGNALS 1822 int sig = 0; 1823 const char *siga = NULL; 1824 size_t si; 1825 #endif 1826 1827 #ifdef SETPROCTITLE_H 1828 setproctitle_init(argc, argv, envp); 1829 #else 1830 UNUSED(envp); 1831 #endif 1832 1833 /* Test for --help and --version */ 1834 if (argc > 1) { 1835 if (strcmp(argv[1], "--help") == 0) { 1836 usage(); 1837 return EXIT_SUCCESS; 1838 } else if (strcmp(argv[1], "--version") == 0) { 1839 printf(""PACKAGE" "VERSION"\n%s\n", dhcpcd_copyright); 1840 printf("Compiled in features:" 1841 #ifdef INET 1842 " INET" 1843 #endif 1844 #ifdef ARP 1845 " ARP" 1846 #endif 1847 #ifdef ARPING 1848 " ARPing" 1849 #endif 1850 #ifdef IPV4LL 1851 " IPv4LL" 1852 #endif 1853 #ifdef INET6 1854 " INET6" 1855 #endif 1856 #ifdef DHCP6 1857 " DHCPv6" 1858 #endif 1859 #ifdef AUTH 1860 " AUTH" 1861 #endif 1862 #ifdef PRIVSEP 1863 " PRIVSEP" 1864 #endif 1865 "\n"); 1866 return EXIT_SUCCESS; 1867 } 1868 } 1869 1870 memset(&ctx, 0, sizeof(ctx)); 1871 1872 ifo = NULL; 1873 ctx.cffile = CONFIG; 1874 ctx.script = UNCONST(dhcpcd_default_script); 1875 ctx.control_fd = ctx.control_unpriv_fd = ctx.link_fd = -1; 1876 ctx.pf_inet_fd = -1; 1877 #ifdef PF_LINK 1878 ctx.pf_link_fd = -1; 1879 #endif 1880 1881 TAILQ_INIT(&ctx.control_fds); 1882 #ifdef USE_SIGNALS 1883 ctx.fork_fd = -1; 1884 #endif 1885 #ifdef PLUGIN_DEV 1886 ctx.dev_fd = -1; 1887 #endif 1888 #ifdef INET 1889 ctx.udp_rfd = -1; 1890 ctx.udp_wfd = -1; 1891 #endif 1892 #if defined(INET6) && !defined(__sun) 1893 ctx.nd_fd = -1; 1894 #endif 1895 #ifdef DHCP6 1896 ctx.dhcp6_rfd = -1; 1897 ctx.dhcp6_wfd = -1; 1898 #endif 1899 #ifdef PRIVSEP 1900 ctx.ps_root_fd = ctx.ps_log_fd = ctx.ps_data_fd = -1; 1901 ctx.ps_inet_fd = ctx.ps_control_fd = -1; 1902 TAILQ_INIT(&ctx.ps_processes); 1903 #endif 1904 1905 /* Check our streams for validity */ 1906 ctx.stdin_valid = fcntl(STDIN_FILENO, F_GETFD) != -1; 1907 ctx.stdout_valid = fcntl(STDOUT_FILENO, F_GETFD) != -1; 1908 ctx.stderr_valid = fcntl(STDERR_FILENO, F_GETFD) != -1; 1909 1910 logopts = LOGERR_LOG | LOGERR_LOG_DATE | LOGERR_LOG_PID; 1911 if (ctx.stderr_valid) 1912 logopts |= LOGERR_ERR; 1913 1914 i = 0; 1915 1916 while ((opt = getopt_long(argc, argv, 1917 ctx.options & DHCPCD_PRINT_PIDFILE ? NOERR_IF_OPTS : IF_OPTS, 1918 cf_options, &oi)) != -1) 1919 { 1920 switch (opt) { 1921 case '4': 1922 family = AF_INET; 1923 break; 1924 case '6': 1925 family = AF_INET6; 1926 break; 1927 case 'f': 1928 ctx.cffile = optarg; 1929 break; 1930 case 'j': 1931 free(ctx.logfile); 1932 ctx.logfile = strdup(optarg); 1933 break; 1934 #ifdef USE_SIGNALS 1935 case 'k': 1936 sig = SIGALRM; 1937 siga = "ALRM"; 1938 break; 1939 case 'n': 1940 sig = SIGHUP; 1941 siga = "HUP"; 1942 break; 1943 case 'g': 1944 case 'p': 1945 /* Force going via command socket as we're 1946 * out of user definable signals. */ 1947 i = 4; 1948 break; 1949 case 'q': 1950 /* -qq disables console output entirely. 1951 * This is important for systemd because it logs 1952 * both console AND syslog to the same log 1953 * resulting in untold confusion. */ 1954 if (logopts & LOGERR_QUIET) 1955 logopts &= ~LOGERR_ERR; 1956 else 1957 logopts |= LOGERR_QUIET; 1958 break; 1959 case 'x': 1960 sig = SIGTERM; 1961 siga = "TERM"; 1962 break; 1963 case 'N': 1964 sig = SIGUSR1; 1965 siga = "USR1"; 1966 break; 1967 #endif 1968 case 'P': 1969 ctx.options |= DHCPCD_PRINT_PIDFILE; 1970 logopts &= ~(LOGERR_LOG | LOGERR_ERR); 1971 break; 1972 case 'T': 1973 i = 1; 1974 logopts &= ~LOGERR_LOG; 1975 break; 1976 case 'U': 1977 i = 3; 1978 break; 1979 case 'V': 1980 i = 2; 1981 break; 1982 case '?': 1983 if (ctx.options & DHCPCD_PRINT_PIDFILE) 1984 continue; 1985 usage(); 1986 goto exit_failure; 1987 } 1988 } 1989 1990 if (optind != argc - 1) 1991 ctx.options |= DHCPCD_MANAGER; 1992 1993 logsetopts(logopts); 1994 logopen(ctx.logfile); 1995 1996 ctx.argv = argv; 1997 ctx.argc = argc; 1998 ctx.ifc = argc - optind; 1999 ctx.ifv = argv + optind; 2000 2001 rt_init(&ctx); 2002 2003 ifo = read_config(&ctx, NULL, NULL, NULL); 2004 if (ifo == NULL) { 2005 if (ctx.options & DHCPCD_PRINT_PIDFILE) 2006 goto printpidfile; 2007 goto exit_failure; 2008 } 2009 2010 opt = add_options(&ctx, NULL, ifo, argc, argv); 2011 if (opt != 1) { 2012 if (ctx.options & DHCPCD_PRINT_PIDFILE) 2013 goto printpidfile; 2014 if (opt == 0) 2015 usage(); 2016 goto exit_failure; 2017 } 2018 if (i == 2) { 2019 printf("Interface options:\n"); 2020 if (optind == argc - 1) { 2021 free_options(&ctx, ifo); 2022 ifo = read_config(&ctx, argv[optind], NULL, NULL); 2023 if (ifo == NULL) 2024 goto exit_failure; 2025 add_options(&ctx, NULL, ifo, argc, argv); 2026 } 2027 if_printoptions(); 2028 #ifdef INET 2029 if (family == 0 || family == AF_INET) { 2030 printf("\nDHCPv4 options:\n"); 2031 dhcp_printoptions(&ctx, 2032 ifo->dhcp_override, ifo->dhcp_override_len); 2033 } 2034 #endif 2035 #ifdef INET6 2036 if (family == 0 || family == AF_INET6) { 2037 printf("\nND options:\n"); 2038 ipv6nd_printoptions(&ctx, 2039 ifo->nd_override, ifo->nd_override_len); 2040 #ifdef DHCP6 2041 printf("\nDHCPv6 options:\n"); 2042 dhcp6_printoptions(&ctx, 2043 ifo->dhcp6_override, ifo->dhcp6_override_len); 2044 #endif 2045 } 2046 #endif 2047 goto exit_success; 2048 } 2049 ctx.options |= ifo->options; 2050 2051 if (i == 1 || i == 3) { 2052 if (i == 1) 2053 ctx.options |= DHCPCD_TEST; 2054 else 2055 ctx.options |= DHCPCD_DUMPLEASE; 2056 ctx.options |= DHCPCD_PERSISTENT; 2057 ctx.options &= ~DHCPCD_DAEMONISE; 2058 } 2059 2060 #ifdef THERE_IS_NO_FORK 2061 ctx.options &= ~DHCPCD_DAEMONISE; 2062 #endif 2063 2064 if (ctx.options & DHCPCD_DEBUG) 2065 logsetopts(logopts | LOGERR_DEBUG); 2066 2067 if (!(ctx.options & (DHCPCD_TEST | DHCPCD_DUMPLEASE))) { 2068 printpidfile: 2069 /* If we have any other args, we should run as a single dhcpcd 2070 * instance for that interface. */ 2071 if (optind == argc - 1 && !(ctx.options & DHCPCD_MANAGER)) { 2072 const char *per; 2073 const char *ifname; 2074 2075 ifname = *ctx.ifv; 2076 if (ifname == NULL || strlen(ifname) > IF_NAMESIZE) { 2077 errno = ifname == NULL ? EINVAL : E2BIG; 2078 logerr("%s: ", ifname); 2079 goto exit_failure; 2080 } 2081 /* Allow a dhcpcd interface per address family */ 2082 switch(family) { 2083 case AF_INET: 2084 per = "-4"; 2085 break; 2086 case AF_INET6: 2087 per = "-6"; 2088 break; 2089 default: 2090 per = ""; 2091 } 2092 snprintf(ctx.pidfile, sizeof(ctx.pidfile), 2093 PIDFILE, ifname, per, "."); 2094 } else { 2095 snprintf(ctx.pidfile, sizeof(ctx.pidfile), 2096 PIDFILE, "", "", ""); 2097 ctx.options |= DHCPCD_MANAGER; 2098 } 2099 if (ctx.options & DHCPCD_PRINT_PIDFILE) { 2100 printf("%s\n", ctx.pidfile); 2101 goto exit_success; 2102 } 2103 } 2104 2105 if (chdir("/") == -1) 2106 logerr("%s: chdir: /", __func__); 2107 2108 /* Freeing allocated addresses from dumping leases can trigger 2109 * eloop removals as well, so init here. */ 2110 if ((ctx.eloop = eloop_new()) == NULL) { 2111 logerr("%s: eloop_init", __func__); 2112 goto exit_failure; 2113 } 2114 2115 #ifdef USE_SIGNALS 2116 for (si = 0; si < dhcpcd_signals_ignore_len; si++) 2117 signal(dhcpcd_signals_ignore[si], SIG_IGN); 2118 2119 /* Save signal mask, block and redirect signals to our handler */ 2120 eloop_signal_set_cb(ctx.eloop, 2121 dhcpcd_signals, dhcpcd_signals_len, 2122 dhcpcd_signal_cb, &ctx); 2123 if (eloop_signal_mask(ctx.eloop, &ctx.sigset) == -1) { 2124 logerr("%s: eloop_signal_mask", __func__); 2125 goto exit_failure; 2126 } 2127 2128 if (sig != 0) { 2129 pid = pidfile_read(ctx.pidfile); 2130 if (pid != 0 && pid != -1) 2131 loginfox("sending signal %s to pid %d", siga, pid); 2132 if (pid == 0 || pid == -1 || kill(pid, sig) != 0) { 2133 if (sig != SIGHUP && sig != SIGUSR1 && errno != EPERM) 2134 logerrx(PACKAGE" not running"); 2135 if (pid != 0 && pid != -1 && errno != ESRCH) { 2136 logerr("kill"); 2137 goto exit_failure; 2138 } 2139 unlink(ctx.pidfile); 2140 if (sig != SIGHUP && sig != SIGUSR1) 2141 goto exit_failure; 2142 } else { 2143 struct timespec ts; 2144 2145 if (sig == SIGHUP || sig == SIGUSR1) 2146 goto exit_success; 2147 /* Spin until it exits */ 2148 loginfox("waiting for pid %d to exit", pid); 2149 ts.tv_sec = 0; 2150 ts.tv_nsec = 100000000; /* 10th of a second */ 2151 for(i = 0; i < 100; i++) { 2152 nanosleep(&ts, NULL); 2153 if (pidfile_read(ctx.pidfile) == -1) 2154 goto exit_success; 2155 } 2156 logerrx("pid %d failed to exit", pid); 2157 goto exit_failure; 2158 } 2159 } 2160 #endif 2161 2162 #ifdef PRIVSEP 2163 ps_init(&ctx); 2164 #endif 2165 2166 #ifndef SMALL 2167 if (ctx.options & DHCPCD_DUMPLEASE && 2168 ioctl(fileno(stdin), FIONREAD, &i, sizeof(i)) == 0 && 2169 i > 0) 2170 { 2171 ctx.options |= DHCPCD_FORKED; /* pretend child process */ 2172 #ifdef PRIVSEP 2173 if (IN_PRIVSEP(&ctx) && ps_managersandbox(&ctx, NULL) == -1) 2174 goto exit_failure; 2175 #endif 2176 ifp = calloc(1, sizeof(*ifp)); 2177 if (ifp == NULL) { 2178 logerr(__func__); 2179 goto exit_failure; 2180 } 2181 ifp->ctx = &ctx; 2182 ifp->options = ifo; 2183 switch (family) { 2184 case AF_INET: 2185 #ifdef INET 2186 if (dhcp_dump(ifp) == -1) 2187 goto exit_failure; 2188 break; 2189 #else 2190 logerrx("No DHCP support"); 2191 goto exit_failure; 2192 #endif 2193 case AF_INET6: 2194 #ifdef DHCP6 2195 if (dhcp6_dump(ifp) == -1) 2196 goto exit_failure; 2197 break; 2198 #else 2199 logerrx("No DHCP6 support"); 2200 goto exit_failure; 2201 #endif 2202 default: 2203 logerrx("Family not specified. Please use -4 or -6."); 2204 goto exit_failure; 2205 } 2206 goto exit_success; 2207 } 2208 #endif 2209 2210 /* Test against siga instead of sig to avoid gcc 2211 * warning about a bogus potential signed overflow. 2212 * The end result will be the same. */ 2213 if ((siga == NULL || i == 4 || ctx.ifc != 0) && 2214 !(ctx.options & DHCPCD_TEST)) 2215 { 2216 ctx.options |= DHCPCD_FORKED; /* avoid socket unlink */ 2217 if (!(ctx.options & DHCPCD_MANAGER)) 2218 ctx.control_fd = control_open(argv[optind], family, 2219 ctx.options & DHCPCD_DUMPLEASE); 2220 if (!(ctx.options & DHCPCD_MANAGER) && ctx.control_fd == -1) 2221 ctx.control_fd = control_open(argv[optind], AF_UNSPEC, 2222 ctx.options & DHCPCD_DUMPLEASE); 2223 if (ctx.control_fd == -1) 2224 ctx.control_fd = control_open(NULL, AF_UNSPEC, 2225 ctx.options & DHCPCD_DUMPLEASE); 2226 if (ctx.control_fd != -1) { 2227 #ifdef PRIVSEP 2228 if (IN_PRIVSEP(&ctx) && 2229 ps_managersandbox(&ctx, NULL) == -1) 2230 goto exit_failure; 2231 #endif 2232 if (!(ctx.options & DHCPCD_DUMPLEASE)) 2233 loginfox("sending commands to dhcpcd process"); 2234 len = control_send(&ctx, argc, argv); 2235 if (len > 0) 2236 logdebugx("send OK"); 2237 else { 2238 logerr("%s: control_send", __func__); 2239 goto exit_failure; 2240 } 2241 if (ctx.options & DHCPCD_DUMPLEASE) { 2242 if (dhcpcd_readdump(&ctx) == -1) { 2243 logerr("%s: dhcpcd_readdump", __func__); 2244 goto exit_failure; 2245 } 2246 goto run_loop; 2247 } 2248 goto exit_success; 2249 } else { 2250 if (errno != ENOENT) 2251 logerr("%s: control_open", __func__); 2252 if (ctx.options & DHCPCD_DUMPLEASE) { 2253 if (errno == ENOENT) 2254 logerrx("dhcpcd is not running"); 2255 goto exit_failure; 2256 } 2257 if (errno == EPERM || errno == EACCES) 2258 goto exit_failure; 2259 } 2260 ctx.options &= ~DHCPCD_FORKED; 2261 } 2262 2263 if (!(ctx.options & DHCPCD_TEST)) { 2264 /* Ensure we have the needed directories */ 2265 if (mkdir(DBDIR, 0750) == -1 && errno != EEXIST) 2266 logerr("%s: mkdir: %s", __func__, DBDIR); 2267 if (mkdir(RUNDIR, 0755) == -1 && errno != EEXIST) 2268 logerr("%s: mkdir: %s", __func__, RUNDIR); 2269 if ((pid = pidfile_lock(ctx.pidfile)) != 0) { 2270 if (pid == -1) 2271 logerr("%s: pidfile_lock: %s", 2272 __func__, ctx.pidfile); 2273 else 2274 logerrx(PACKAGE 2275 " already running on pid %d (%s)", 2276 pid, ctx.pidfile); 2277 goto exit_failure; 2278 } 2279 } 2280 2281 loginfox(PACKAGE "-" VERSION " starting"); 2282 if (ctx.stdin_valid && freopen(_PATH_DEVNULL, "w", stdin) == NULL) 2283 logwarn("freopen stdin"); 2284 2285 #if defined(USE_SIGNALS) && !defined(THERE_IS_NO_FORK) 2286 if (!(ctx.options & DHCPCD_DAEMONISE)) 2287 goto start_manager; 2288 2289 if (xsocketpair(AF_UNIX, SOCK_DGRAM | SOCK_CXNB, 0, fork_fd) == -1 || 2290 (ctx.stderr_valid && 2291 xsocketpair(AF_UNIX, SOCK_DGRAM | SOCK_CXNB, 0, stderr_fd) == -1)) 2292 { 2293 logerr("socketpair"); 2294 goto exit_failure; 2295 } 2296 switch (pid = fork()) { 2297 case -1: 2298 logerr("fork"); 2299 goto exit_failure; 2300 case 0: 2301 ctx.fork_fd = fork_fd[1]; 2302 close(fork_fd[0]); 2303 #ifdef PRIVSEP_RIGHTS 2304 if (ps_rights_limit_fd(ctx.fork_fd) == -1) { 2305 logerr("ps_rights_limit_fdpair"); 2306 goto exit_failure; 2307 } 2308 #endif 2309 eloop_event_add(ctx.eloop, ctx.fork_fd, dhcpcd_fork_cb, &ctx); 2310 2311 /* 2312 * Redirect stderr to the stderr socketpair. 2313 * Redirect stdout as well. 2314 * dhcpcd doesn't output via stdout, but something in 2315 * a called script might. 2316 */ 2317 if (ctx.stderr_valid) { 2318 if (dup2(stderr_fd[1], STDERR_FILENO) == -1 || 2319 (ctx.stdout_valid && 2320 dup2(stderr_fd[1], STDOUT_FILENO) == -1)) 2321 logerr("dup2"); 2322 close(stderr_fd[0]); 2323 close(stderr_fd[1]); 2324 } else if (ctx.stdout_valid) { 2325 if (freopen(_PATH_DEVNULL, "w", stdout) == NULL) 2326 logerr("freopen stdout"); 2327 } 2328 if (setsid() == -1) { 2329 logerr("%s: setsid", __func__); 2330 goto exit_failure; 2331 } 2332 /* Ensure we can never get a controlling terminal */ 2333 switch (pid = fork()) { 2334 case -1: 2335 logerr("fork"); 2336 goto exit_failure; 2337 case 0: 2338 break; 2339 default: 2340 ctx.options |= DHCPCD_FORKED; /* A lie */ 2341 i = EXIT_SUCCESS; 2342 goto exit1; 2343 } 2344 break; 2345 default: 2346 setproctitle("[launcher]"); 2347 ctx.options |= DHCPCD_FORKED | DHCPCD_LAUNCHER; 2348 ctx.fork_fd = fork_fd[0]; 2349 close(fork_fd[1]); 2350 #ifdef PRIVSEP_RIGHTS 2351 if (ps_rights_limit_fd(ctx.fork_fd) == -1) { 2352 logerr("ps_rights_limit_fd"); 2353 goto exit_failure; 2354 } 2355 #endif 2356 eloop_event_add(ctx.eloop, ctx.fork_fd, dhcpcd_fork_cb, &ctx); 2357 2358 if (ctx.stderr_valid) { 2359 ctx.stderr_fd = stderr_fd[0]; 2360 close(stderr_fd[1]); 2361 #ifdef PRIVSEP_RIGHTS 2362 if (ps_rights_limit_fd(ctx.stderr_fd) == 1) { 2363 logerr("ps_rights_limit_fd"); 2364 goto exit_failure; 2365 } 2366 #endif 2367 eloop_event_add(ctx.eloop, ctx.stderr_fd, 2368 dhcpcd_stderr_cb, &ctx); 2369 } 2370 #ifdef PRIVSEP 2371 if (IN_PRIVSEP(&ctx) && ps_managersandbox(&ctx, NULL) == -1) 2372 goto exit_failure; 2373 #endif 2374 goto run_loop; 2375 } 2376 2377 /* We have now forked, setsid, forked once more. 2378 * From this point on, we are the controlling daemon. */ 2379 logdebugx("spawned manager process on PID %d", getpid()); 2380 start_manager: 2381 ctx.options |= DHCPCD_STARTED; 2382 if ((pid = pidfile_lock(ctx.pidfile)) != 0) { 2383 logerr("%s: pidfile_lock %d", __func__, pid); 2384 #ifdef PRIVSEP 2385 /* privsep has not started ... */ 2386 ctx.options &= ~DHCPCD_PRIVSEP; 2387 #endif 2388 goto exit_failure; 2389 } 2390 #endif 2391 2392 os_init(); 2393 2394 #if defined(BSD) && defined(INET6) 2395 /* Disable the kernel RTADV sysctl as early as possible. */ 2396 if (ctx.options & DHCPCD_IPV6 && ctx.options & DHCPCD_IPV6RS) 2397 if_disable_rtadv(); 2398 #endif 2399 2400 #ifdef PRIVSEP 2401 if (IN_PRIVSEP(&ctx) && ps_start(&ctx) == -1) { 2402 logerr("ps_start"); 2403 goto exit_failure; 2404 } 2405 if (ctx.options & DHCPCD_FORKED) 2406 goto run_loop; 2407 #endif 2408 2409 if (!(ctx.options & DHCPCD_TEST)) { 2410 if (control_start(&ctx, 2411 ctx.options & DHCPCD_MANAGER ? 2412 NULL : argv[optind], family) == -1) 2413 { 2414 logerr("%s: control_start", __func__); 2415 goto exit_failure; 2416 } 2417 } 2418 2419 #ifdef PLUGIN_DEV 2420 /* Start any dev listening plugin which may want to 2421 * change the interface name provided by the kernel */ 2422 if (!IN_PRIVSEP(&ctx) && 2423 (ctx.options & (DHCPCD_MANAGER | DHCPCD_DEV)) == 2424 (DHCPCD_MANAGER | DHCPCD_DEV)) 2425 dev_start(&ctx, dhcpcd_handleinterface); 2426 #endif 2427 2428 setproctitle("%s%s%s", 2429 ctx.options & DHCPCD_MANAGER ? "[manager]" : argv[optind], 2430 ctx.options & DHCPCD_IPV4 ? " [ip4]" : "", 2431 ctx.options & DHCPCD_IPV6 ? " [ip6]" : ""); 2432 2433 if (if_opensockets(&ctx) == -1) { 2434 logerr("%s: if_opensockets", __func__); 2435 goto exit_failure; 2436 } 2437 #ifndef SMALL 2438 dhcpcd_setlinkrcvbuf(&ctx); 2439 #endif 2440 2441 /* Try and create DUID from the machine UUID. */ 2442 dhcpcd_initduid(&ctx, NULL); 2443 2444 /* Cache the default vendor option. */ 2445 if (dhcp_vendor(ctx.vendor, sizeof(ctx.vendor)) == -1) 2446 logerr("dhcp_vendor"); 2447 2448 /* Start handling kernel messages for interfaces, addresses and 2449 * routes. */ 2450 eloop_event_add(ctx.eloop, ctx.link_fd, dhcpcd_handlelink, &ctx); 2451 2452 #ifdef PRIVSEP 2453 if (IN_PRIVSEP(&ctx) && ps_managersandbox(&ctx, "stdio route") == -1) 2454 goto exit_failure; 2455 #endif 2456 2457 /* When running dhcpcd against a single interface, we need to retain 2458 * the old behaviour of waiting for an IP address */ 2459 if (ctx.ifc == 1 && !(ctx.options & DHCPCD_BACKGROUND)) 2460 ctx.options |= DHCPCD_WAITIP; 2461 2462 ctx.ifaces = if_discover(&ctx, &ifaddrs, ctx.ifc, ctx.ifv); 2463 if (ctx.ifaces == NULL) { 2464 logerr("%s: if_discover", __func__); 2465 goto exit_failure; 2466 } 2467 for (i = 0; i < ctx.ifc; i++) { 2468 if ((ifp = if_find(ctx.ifaces, ctx.ifv[i])) == NULL) 2469 logerrx("%s: interface not found", 2470 ctx.ifv[i]); 2471 else if (!ifp->active) 2472 logerrx("%s: interface has an invalid configuration", 2473 ctx.ifv[i]); 2474 } 2475 TAILQ_FOREACH(ifp, ctx.ifaces, next) { 2476 if (ifp->active == IF_ACTIVE_USER) 2477 break; 2478 } 2479 if (ifp == NULL) { 2480 if (ctx.ifc == 0) { 2481 int loglevel; 2482 2483 loglevel = ctx.options & DHCPCD_INACTIVE ? 2484 LOG_DEBUG : LOG_ERR; 2485 logmessage(loglevel, "no valid interfaces found"); 2486 dhcpcd_daemonise(&ctx); 2487 } else 2488 goto exit_failure; 2489 if (!(ctx.options & DHCPCD_LINK)) { 2490 logerrx("aborting as link detection is disabled"); 2491 goto exit_failure; 2492 } 2493 } 2494 2495 TAILQ_FOREACH(ifp, ctx.ifaces, next) { 2496 if (ifp->active) 2497 dhcpcd_initstate1(ifp, argc, argv, 0); 2498 } 2499 if_learnaddrs(&ctx, ctx.ifaces, &ifaddrs); 2500 2501 if (ctx.options & DHCPCD_BACKGROUND) 2502 dhcpcd_daemonise(&ctx); 2503 2504 opt = 0; 2505 TAILQ_FOREACH(ifp, ctx.ifaces, next) { 2506 if (ifp->active) { 2507 run_preinit(ifp); 2508 if (if_is_link_up(ifp)) 2509 opt = 1; 2510 } 2511 } 2512 2513 if (!(ctx.options & DHCPCD_BACKGROUND)) { 2514 if (ctx.options & DHCPCD_MANAGER) 2515 t = ifo->timeout; 2516 else { 2517 t = 0; 2518 TAILQ_FOREACH(ifp, ctx.ifaces, next) { 2519 if (ifp->active) { 2520 t = ifp->options->timeout; 2521 break; 2522 } 2523 } 2524 } 2525 if (opt == 0 && 2526 ctx.options & DHCPCD_LINK && 2527 !(ctx.options & DHCPCD_WAITIP)) 2528 { 2529 int loglevel; 2530 2531 loglevel = ctx.options & DHCPCD_INACTIVE ? 2532 LOG_DEBUG : LOG_WARNING; 2533 logmessage(loglevel, "no interfaces have a carrier"); 2534 dhcpcd_daemonise(&ctx); 2535 } else if (t > 0 && 2536 /* Test mode removes the daemonise bit, so check for both */ 2537 ctx.options & (DHCPCD_DAEMONISE | DHCPCD_TEST)) 2538 { 2539 eloop_timeout_add_sec(ctx.eloop, t, 2540 handle_exit_timeout, &ctx); 2541 } 2542 } 2543 free_options(&ctx, ifo); 2544 ifo = NULL; 2545 2546 TAILQ_FOREACH(ifp, ctx.ifaces, next) { 2547 if (ifp->active) 2548 eloop_timeout_add_sec(ctx.eloop, 0, 2549 dhcpcd_prestartinterface, ifp); 2550 } 2551 2552 run_loop: 2553 i = eloop_start(ctx.eloop, &ctx.sigset); 2554 if (i < 0) { 2555 logerr("%s: eloop_start", __func__); 2556 goto exit_failure; 2557 } 2558 goto exit1; 2559 2560 exit_success: 2561 i = EXIT_SUCCESS; 2562 goto exit1; 2563 2564 exit_failure: 2565 i = EXIT_FAILURE; 2566 2567 exit1: 2568 if (!(ctx.options & DHCPCD_TEST) && control_stop(&ctx) == -1) 2569 logerr("%s: control_stop", __func__); 2570 if (ifaddrs != NULL) { 2571 #ifdef PRIVSEP_GETIFADDRS 2572 if (IN_PRIVSEP(&ctx)) 2573 free(ifaddrs); 2574 else 2575 #endif 2576 freeifaddrs(ifaddrs); 2577 } 2578 /* ps_stop will clear DHCPCD_PRIVSEP but we need to 2579 * remember it to avoid attemping to remove the pidfile */ 2580 oi = ctx.options & DHCPCD_PRIVSEP ? 1 : 0; 2581 #ifdef PRIVSEP 2582 ps_stop(&ctx); 2583 #endif 2584 /* Free memory and close fd's */ 2585 if (ctx.ifaces) { 2586 while ((ifp = TAILQ_FIRST(ctx.ifaces))) { 2587 TAILQ_REMOVE(ctx.ifaces, ifp, next); 2588 if_free(ifp); 2589 } 2590 free(ctx.ifaces); 2591 ctx.ifaces = NULL; 2592 } 2593 free_options(&ctx, ifo); 2594 #ifdef HAVE_OPEN_MEMSTREAM 2595 if (ctx.script_fp) 2596 fclose(ctx.script_fp); 2597 #endif 2598 free(ctx.script_buf); 2599 free(ctx.script_env); 2600 rt_dispose(&ctx); 2601 free(ctx.duid); 2602 if (ctx.link_fd != -1) { 2603 eloop_event_delete(ctx.eloop, ctx.link_fd); 2604 close(ctx.link_fd); 2605 } 2606 if_closesockets(&ctx); 2607 free_globals(&ctx); 2608 #ifdef INET6 2609 ipv6_ctxfree(&ctx); 2610 #endif 2611 #ifdef PLUGIN_DEV 2612 dev_stop(&ctx); 2613 #endif 2614 #ifdef PRIVSEP 2615 eloop_free(ctx.ps_eloop); 2616 #endif 2617 eloop_free(ctx.eloop); 2618 if (ctx.script != dhcpcd_default_script) 2619 free(ctx.script); 2620 if (ctx.options & DHCPCD_STARTED && !(ctx.options & DHCPCD_FORKED)) 2621 loginfox(PACKAGE " exited"); 2622 logclose(); 2623 free(ctx.logfile); 2624 free(ctx.ctl_buf); 2625 #ifdef SETPROCTITLE_H 2626 setproctitle_fini(); 2627 #endif 2628 #ifdef USE_SIGNALS 2629 if (ctx.options & DHCPCD_STARTED) { 2630 /* Try to detach from the launch process. */ 2631 if (ctx.fork_fd != -1 && 2632 write(ctx.fork_fd, &i, sizeof(i)) == -1) 2633 logerr("%s: write", __func__); 2634 } 2635 if (ctx.options & DHCPCD_FORKED || oi != 0) 2636 _exit(i); /* so atexit won't remove our pidfile */ 2637 #endif 2638 return i; 2639 } 2640