1 /* 2 * dhcpcd - DHCP client daemon 3 * Copyright (c) 2006-2012 Roy Marples <roy (at) marples.name> 4 * All rights reserved 5 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 const char copyright[] = "Copyright (c) 2006-2012 Roy Marples"; 29 30 #include <sys/file.h> 31 #include <sys/socket.h> 32 #include <sys/stat.h> 33 #include <sys/time.h> 34 #include <sys/types.h> 35 #include <sys/uio.h> 36 37 #include <arpa/inet.h> 38 #include <net/route.h> 39 40 #ifdef __linux__ 41 # include <asm/types.h> /* for systems with broken headers */ 42 # include <linux/rtnetlink.h> 43 #endif 44 45 #include <ctype.h> 46 #include <errno.h> 47 #include <getopt.h> 48 #include <limits.h> 49 #include <paths.h> 50 #include <signal.h> 51 #include <stdio.h> 52 #include <stdlib.h> 53 #include <string.h> 54 #include <syslog.h> 55 #include <unistd.h> 56 #include <time.h> 57 58 #include "arp.h" 59 #include "bind.h" 60 #include "config.h" 61 #include "common.h" 62 #include "configure.h" 63 #include "control.h" 64 #include "dhcpcd.h" 65 #include "duid.h" 66 #include "eloop.h" 67 #include "if-options.h" 68 #include "if-pref.h" 69 #include "ipv4ll.h" 70 #include "ipv6rs.h" 71 #include "net.h" 72 #include "platform.h" 73 #include "signals.h" 74 75 #ifdef ANDROID 76 #include <sys/capability.h> 77 #include <linux/prctl.h> 78 #include <cutils/properties.h> 79 #include <private/android_filesystem_config.h> 80 #endif 81 82 /* We should define a maximum for the NAK exponential backoff */ 83 #define NAKOFF_MAX 60 84 85 /* Wait N nanoseconds between sending a RELEASE and dropping the address. 86 * This gives the kernel enough time to actually send it. */ 87 #define RELEASE_DELAY_S 0 88 #define RELEASE_DELAY_NS 10000000 89 90 unsigned long long options = 0; 91 int pidfd = -1; 92 struct interface *ifaces = NULL; 93 int ifac = 0; 94 char **ifav = NULL; 95 int ifdc = 0; 96 char **ifdv = NULL; 97 /* If set, avoid routes after a DHCP success */ 98 int avoid_routes = 0; 99 100 static char **margv; 101 static int margc; 102 static struct if_options *if_options; 103 static char **ifv; 104 static int ifc; 105 static char *cffile; 106 static char *pidfile; 107 static int linkfd = -1, ipv6rsfd = -1; 108 109 struct dhcp_op { 110 uint8_t value; 111 const char *name; 112 }; 113 114 static const struct dhcp_op dhcp_ops[] = { 115 { DHCP_DISCOVER, "DISCOVER" }, 116 { DHCP_OFFER, "OFFER" }, 117 { DHCP_REQUEST, "REQUEST" }, 118 { DHCP_DECLINE, "DECLINE" }, 119 { DHCP_ACK, "ACK" }, 120 { DHCP_NAK, "NAK" }, 121 { DHCP_RELEASE, "RELEASE" }, 122 { DHCP_INFORM, "INFORM" }, 123 { 0, NULL } 124 }; 125 126 static void send_release(struct interface *); 127 128 static const char * 129 get_dhcp_op(uint8_t type) 130 { 131 const struct dhcp_op *d; 132 133 for (d = dhcp_ops; d->name; d++) 134 if (d->value == type) 135 return d->name; 136 return NULL; 137 } 138 139 static pid_t 140 read_pid(void) 141 { 142 FILE *fp; 143 pid_t pid; 144 145 if ((fp = fopen(pidfile, "r")) == NULL) { 146 errno = ENOENT; 147 return 0; 148 } 149 if (fscanf(fp, "%d", &pid) != 1) 150 pid = 0; 151 fclose(fp); 152 return pid; 153 } 154 155 static void 156 usage(void) 157 { 158 159 printf("usage: "PACKAGE"\t[-aABbDdEGgHJKkLnpqTVw]\n" 160 "\t\t[-C, --nohook hook] [-c, --script script]\n" 161 "\t\t[-e, --env value] [-F, --fqdn FQDN] [-f, --config file]\n" 162 "\t\t[-h, --hostname hostname] [-I, --clientid clientid]\n" 163 "\t\t[-i, --vendorclassid vendorclassid] [-l, --leasetime seconds]\n" 164 "\t\t[-m, --metric metric] [-O, --nooption option]\n" 165 "\t\t[-o, --option option] [-Q, --require option]\n" 166 "\t\t[-r, --request address] [-S, --static value]\n" 167 "\t\t[-s, --inform address[/cidr]] [-t, --timeout seconds]\n" 168 "\t\t[-u, --userclass class] [-v, --vendor code, value]\n" 169 "\t\t[-W, --whitelist address[/cidr]] [-y, --reboot seconds]\n" 170 "\t\t[-X, --blacklist address[/cidr]] [-Z, --denyinterfaces pattern]\n" 171 "\t\t[-z, --allowinterfaces pattern] [interface] [...]\n" 172 " "PACKAGE"\t-k, --release [interface]\n" 173 " "PACKAGE"\t-U, --dumplease interface\n" 174 " "PACKAGE"\t-v, --version\n" 175 " "PACKAGE"\t-x, --exit [interface]\n"); 176 } 177 178 static void 179 cleanup(void) 180 { 181 #ifdef DEBUG_MEMORY 182 struct interface *iface; 183 int i; 184 185 free_options(if_options); 186 187 while (ifaces) { 188 iface = ifaces; 189 ifaces = iface->next; 190 free_interface(iface); 191 } 192 193 for (i = 0; i < ifac; i++) 194 free(ifav[i]); 195 free(ifav); 196 for (i = 0; i < ifdc; i++) 197 free(ifdv[i]); 198 free(ifdv); 199 #endif 200 201 if (linkfd != -1) 202 close(linkfd); 203 if (pidfd > -1) { 204 if (options & DHCPCD_MASTER) { 205 if (stop_control() == -1) 206 syslog(LOG_ERR, "stop_control: %m"); 207 } 208 close(pidfd); 209 unlink(pidfile); 210 } 211 #ifdef DEBUG_MEMORY 212 free(pidfile); 213 #endif 214 } 215 216 /* ARGSUSED */ 217 void 218 handle_exit_timeout(_unused void *arg) 219 { 220 int timeout; 221 222 syslog(LOG_ERR, "timed out"); 223 if (!(options & DHCPCD_TIMEOUT_IPV4LL)) { 224 if (options & DHCPCD_MASTER) { 225 daemonise(); 226 return; 227 } else 228 exit(EXIT_FAILURE); 229 } 230 options &= ~DHCPCD_TIMEOUT_IPV4LL; 231 timeout = (PROBE_NUM * PROBE_MAX) + (PROBE_WAIT * 2); 232 syslog(LOG_WARNING, "allowing %d seconds for IPv4LL timeout", timeout); 233 add_timeout_sec(timeout, handle_exit_timeout, NULL); 234 } 235 236 void 237 drop_dhcp(struct interface *iface, const char *reason) 238 { 239 free(iface->state->old); 240 iface->state->old = iface->state->new; 241 iface->state->new = NULL; 242 iface->state->reason = reason; 243 configure(iface); 244 free(iface->state->old); 245 iface->state->old = NULL; 246 iface->state->lease.addr.s_addr = 0; 247 } 248 249 struct interface * 250 find_interface(const char *ifname) 251 { 252 struct interface *ifp; 253 254 for (ifp = ifaces; ifp; ifp = ifp->next) 255 if (strcmp(ifp->name, ifname) == 0) 256 return ifp; 257 return NULL; 258 } 259 260 static void 261 stop_interface(struct interface *iface) 262 { 263 struct interface *ifp, *ifl = NULL; 264 265 syslog(LOG_INFO, "%s: removing interface", iface->name); 266 if (iface->ras) { 267 ipv6rs_free(iface); 268 iface->ras = NULL; 269 run_script_reason(iface, "ROUTERADVERT"); 270 } 271 if (strcmp(iface->state->reason, "RELEASE") != 0) 272 drop_dhcp(iface, "STOP"); 273 close_sockets(iface); 274 delete_timeout(NULL, iface); 275 for (ifp = ifaces; ifp; ifp = ifp->next) { 276 if (ifp == iface) 277 break; 278 ifl = ifp; 279 } 280 if (ifl) 281 ifl->next = ifp->next; 282 else 283 ifaces = ifp->next; 284 free_interface(ifp); 285 if (!(options & (DHCPCD_MASTER | DHCPCD_TEST))) 286 exit(EXIT_FAILURE); 287 } 288 289 static uint32_t 290 dhcp_xid(struct interface *iface) 291 { 292 uint32_t xid; 293 294 if (iface->state->options->options & DHCPCD_XID_HWADDR && 295 iface->hwlen >= sizeof(xid)) 296 /* The lower bits are probably more unique on the network */ 297 memcpy(&xid, (iface->hwaddr + iface->hwlen) - sizeof(xid), 298 sizeof(xid)); 299 else 300 xid = arc4random(); 301 302 return xid; 303 } 304 305 static void 306 send_message(struct interface *iface, int type, 307 void (*callback)(void *)) 308 { 309 struct if_state *state = iface->state; 310 struct if_options *ifo = state->options; 311 struct dhcp_message *dhcp; 312 uint8_t *udp; 313 ssize_t len, r; 314 struct in_addr from, to; 315 in_addr_t a = 0; 316 struct timeval tv; 317 318 if (!callback) 319 syslog(LOG_DEBUG, "%s: sending %s with xid 0x%x", 320 iface->name, get_dhcp_op(type), state->xid); 321 else { 322 if (state->interval == 0) 323 state->interval = 4; 324 else { 325 state->interval *= 2; 326 if (state->interval > 64) 327 state->interval = 64; 328 } 329 tv.tv_sec = state->interval + DHCP_RAND_MIN; 330 tv.tv_usec = arc4random() % (DHCP_RAND_MAX_U - DHCP_RAND_MIN_U); 331 syslog(LOG_DEBUG, 332 "%s: sending %s (xid 0x%x), next in %0.2f seconds", 333 iface->name, get_dhcp_op(type), state->xid, 334 timeval_to_double(&tv)); 335 } 336 337 /* Ensure sockets are open. */ 338 open_sockets(iface); 339 340 /* If we couldn't open a UDP port for our IP address 341 * then we cannot renew. 342 * This could happen if our IP was pulled out from underneath us. 343 * Also, we should not unicast from a BOOTP lease. */ 344 if (iface->udp_fd == -1 || 345 (!(ifo->options & DHCPCD_INFORM) && is_bootp(iface->state->new))) 346 { 347 a = iface->addr.s_addr; 348 iface->addr.s_addr = 0; 349 } 350 len = make_message(&dhcp, iface, type); 351 if (a) 352 iface->addr.s_addr = a; 353 from.s_addr = dhcp->ciaddr; 354 if (from.s_addr) 355 to.s_addr = state->lease.server.s_addr; 356 else 357 to.s_addr = 0; 358 if (to.s_addr && to.s_addr != INADDR_BROADCAST) { 359 r = send_packet(iface, to, (uint8_t *)dhcp, len); 360 if (r == -1) { 361 syslog(LOG_ERR, "%s: send_packet: %m", iface->name); 362 close_sockets(iface); 363 } 364 } else { 365 len = make_udp_packet(&udp, (uint8_t *)dhcp, len, from, to); 366 r = send_raw_packet(iface, ETHERTYPE_IP, udp, len); 367 free(udp); 368 /* If we failed to send a raw packet this normally means 369 * we don't have the ability to work beneath the IP layer 370 * for this interface. 371 * As such we remove it from consideration without actually 372 * stopping the interface. */ 373 if (r == -1) { 374 syslog(LOG_ERR, "%s: send_raw_packet: %m", iface->name); 375 if (!(options & DHCPCD_TEST)) 376 drop_dhcp(iface, "FAIL"); 377 close_sockets(iface); 378 delete_timeout(NULL, iface); 379 callback = NULL; 380 } 381 } 382 free(dhcp); 383 384 /* Even if we fail to send a packet we should continue as we are 385 * as our failure timeouts will change out codepath when needed. */ 386 if (callback) 387 add_timeout_tv(&tv, callback, iface); 388 } 389 390 static void 391 send_inform(void *arg) 392 { 393 send_message((struct interface *)arg, DHCP_INFORM, send_inform); 394 } 395 396 static void 397 send_discover(void *arg) 398 { 399 send_message((struct interface *)arg, DHCP_DISCOVER, send_discover); 400 } 401 402 static void 403 send_request(void *arg) 404 { 405 send_message((struct interface *)arg, DHCP_REQUEST, send_request); 406 } 407 408 static void 409 send_renew(void *arg) 410 { 411 send_message((struct interface *)arg, DHCP_REQUEST, send_renew); 412 } 413 414 static void 415 send_rebind(void *arg) 416 { 417 send_message((struct interface *)arg, DHCP_REQUEST, send_rebind); 418 } 419 420 void 421 start_expire(void *arg) 422 { 423 struct interface *iface = arg; 424 425 iface->state->interval = 0; 426 if (iface->addr.s_addr == 0) { 427 /* We failed to reboot, so enter discovery. */ 428 iface->state->lease.addr.s_addr = 0; 429 start_discover(iface); 430 return; 431 } 432 433 syslog(LOG_ERR, "%s: lease expired", iface->name); 434 delete_timeout(NULL, iface); 435 drop_dhcp(iface, "EXPIRE"); 436 unlink(iface->leasefile); 437 if (iface->carrier != LINK_DOWN) 438 start_interface(iface); 439 } 440 441 static void 442 log_dhcp(int lvl, const char *msg, 443 const struct interface *iface, const struct dhcp_message *dhcp, 444 const struct in_addr *from) 445 { 446 const char *tfrom; 447 char *a; 448 struct in_addr addr; 449 int r; 450 451 if (strcmp(msg, "NAK:") == 0) 452 a = get_option_string(dhcp, DHO_MESSAGE); 453 else if (dhcp->yiaddr != 0) { 454 addr.s_addr = dhcp->yiaddr; 455 a = xstrdup(inet_ntoa(addr)); 456 } else 457 a = NULL; 458 459 tfrom = "from"; 460 r = get_option_addr(&addr, dhcp, DHO_SERVERID); 461 if (dhcp->servername[0] && r == 0) 462 syslog(lvl, "%s: %s %s %s %s `%s'", iface->name, msg, a, 463 tfrom, inet_ntoa(addr), dhcp->servername); 464 else { 465 if (r != 0) { 466 tfrom = "via"; 467 addr = *from; 468 } 469 if (a == NULL) 470 syslog(lvl, "%s: %s %s %s", 471 iface->name, msg, tfrom, inet_ntoa(addr)); 472 else 473 syslog(lvl, "%s: %s %s %s %s", 474 iface->name, msg, a, tfrom, inet_ntoa(addr)); 475 } 476 free(a); 477 } 478 479 static int 480 blacklisted_ip(const struct if_options *ifo, in_addr_t addr) 481 { 482 size_t i; 483 484 for (i = 0; i < ifo->blacklist_len; i += 2) 485 if (ifo->blacklist[i] == (addr & ifo->blacklist[i + 1])) 486 return 1; 487 return 0; 488 } 489 490 static int 491 whitelisted_ip(const struct if_options *ifo, in_addr_t addr) 492 { 493 size_t i; 494 495 if (ifo->whitelist_len == 0) 496 return -1; 497 for (i = 0; i < ifo->whitelist_len; i += 2) 498 if (ifo->whitelist[i] == (addr & ifo->whitelist[i + 1])) 499 return 1; 500 return 0; 501 } 502 503 static void 504 handle_dhcp(struct interface *iface, struct dhcp_message **dhcpp, const struct in_addr *from) 505 { 506 struct if_state *state = iface->state; 507 struct if_options *ifo = state->options; 508 struct dhcp_message *dhcp = *dhcpp; 509 struct dhcp_lease *lease = &state->lease; 510 uint8_t type, tmp; 511 struct in_addr addr; 512 size_t i; 513 514 /* reset the message counter */ 515 state->interval = 0; 516 517 /* We may have found a BOOTP server */ 518 if (get_option_uint8(&type, dhcp, DHO_MESSAGETYPE) == -1) 519 type = 0; 520 521 if (type == DHCP_NAK) { 522 /* For NAK, only check if we require the ServerID */ 523 if (has_option_mask(ifo->requiremask, DHO_SERVERID) && 524 get_option_addr(&addr, dhcp, DHO_SERVERID) == -1) 525 { 526 log_dhcp(LOG_WARNING, "reject NAK", iface, dhcp, from); 527 return; 528 } 529 /* We should restart on a NAK */ 530 log_dhcp(LOG_WARNING, "NAK:", iface, dhcp, from); 531 if (!(options & DHCPCD_TEST)) { 532 drop_dhcp(iface, "NAK"); 533 unlink(iface->leasefile); 534 } 535 close_sockets(iface); 536 /* If we constantly get NAKS then we should slowly back off */ 537 add_timeout_sec(state->nakoff, start_interface, iface); 538 state->nakoff *= 2; 539 if (state->nakoff > NAKOFF_MAX) 540 state->nakoff = NAKOFF_MAX; 541 return; 542 } 543 544 /* Ensure that all required options are present */ 545 for (i = 1; i < 255; i++) { 546 if (has_option_mask(ifo->requiremask, i) && 547 get_option_uint8(&tmp, dhcp, i) != 0) 548 { 549 /* If we are bootp, then ignore the need for serverid. 550 * To ignore bootp, require dhcp_message_type instead. */ 551 if (type == 0 && i == DHO_SERVERID) 552 continue; 553 log_dhcp(LOG_WARNING, "reject DHCP", iface, dhcp, from); 554 return; 555 } 556 } 557 558 /* Ensure that the address offered is valid */ 559 if ((type == 0 || type == DHCP_OFFER || type == DHCP_ACK) && 560 (dhcp->ciaddr == INADDR_ANY || dhcp->ciaddr == INADDR_BROADCAST) && 561 (dhcp->yiaddr == INADDR_ANY || dhcp->yiaddr == INADDR_BROADCAST)) 562 { 563 log_dhcp(LOG_WARNING, "reject invalid address", 564 iface, dhcp, from); 565 return; 566 } 567 568 /* No NAK, so reset the backoff */ 569 state->nakoff = 1; 570 571 if ((type == 0 || type == DHCP_OFFER) && 572 state->state == DHS_DISCOVER) 573 { 574 lease->frominfo = 0; 575 lease->addr.s_addr = dhcp->yiaddr; 576 lease->cookie = dhcp->cookie; 577 if (type == 0 || 578 get_option_addr(&lease->server, dhcp, DHO_SERVERID) != 0) 579 lease->server.s_addr = INADDR_ANY; 580 log_dhcp(LOG_INFO, "offered", iface, dhcp, from); 581 free(state->offer); 582 state->offer = dhcp; 583 *dhcpp = NULL; 584 if (options & DHCPCD_TEST) { 585 free(state->old); 586 state->old = state->new; 587 state->new = state->offer; 588 state->offer = NULL; 589 state->reason = "TEST"; 590 run_script(iface); 591 exit(EXIT_SUCCESS); 592 } 593 delete_timeout(send_discover, iface); 594 /* We don't request BOOTP addresses */ 595 if (type) { 596 /* We used to ARP check here, but that seems to be in 597 * violation of RFC2131 where it only describes 598 * DECLINE after REQUEST. 599 * It also seems that some MS DHCP servers actually 600 * ignore DECLINE if no REQUEST, ie we decline a 601 * DISCOVER. */ 602 start_request(iface); 603 return; 604 } 605 } 606 607 if (type) { 608 if (type == DHCP_OFFER) { 609 log_dhcp(LOG_INFO, "ignoring offer of", 610 iface, dhcp, from); 611 return; 612 } 613 614 /* We should only be dealing with acks */ 615 if (type != DHCP_ACK) { 616 log_dhcp(LOG_ERR, "not ACK or OFFER", 617 iface, dhcp, from); 618 return; 619 } 620 621 if (!(ifo->options & DHCPCD_INFORM)) 622 log_dhcp(LOG_INFO, "acknowledged", iface, dhcp, from); 623 } 624 625 /* BOOTP could have already assigned this above, so check we still 626 * have a pointer. */ 627 if (*dhcpp) { 628 free(state->offer); 629 state->offer = dhcp; 630 *dhcpp = NULL; 631 } 632 633 lease->frominfo = 0; 634 delete_timeout(NULL, iface); 635 636 /* We now have an offer, so close the DHCP sockets. 637 * This allows us to safely ARP when broken DHCP servers send an ACK 638 * follows by an invalid NAK. */ 639 close_sockets(iface); 640 641 if (ifo->options & DHCPCD_ARP && 642 iface->addr.s_addr != state->offer->yiaddr) 643 { 644 /* If the interface already has the address configured 645 * then we can't ARP for duplicate detection. */ 646 addr.s_addr = state->offer->yiaddr; 647 if (has_address(iface->name, &addr, NULL) != 1) { 648 state->claims = 0; 649 state->probes = 0; 650 state->conflicts = 0; 651 state->state = DHS_PROBE; 652 send_arp_probe(iface); 653 return; 654 } 655 } 656 657 bind_interface(iface); 658 } 659 660 static void 661 handle_dhcp_packet(void *arg) 662 { 663 struct interface *iface = arg; 664 uint8_t *packet; 665 struct dhcp_message *dhcp = NULL; 666 const uint8_t *pp; 667 ssize_t bytes; 668 struct in_addr from; 669 int i, partialcsum = 0; 670 671 /* We loop through until our buffer is empty. 672 * The benefit is that if we get >1 DHCP packet in our buffer and 673 * the first one fails for any reason, we can use the next. */ 674 packet = xmalloc(udp_dhcp_len); 675 for(;;) { 676 bytes = get_raw_packet(iface, ETHERTYPE_IP, 677 packet, udp_dhcp_len, &partialcsum); 678 if (bytes == 0 || bytes == -1) 679 break; 680 if (valid_udp_packet(packet, bytes, &from, partialcsum) == -1) { 681 syslog(LOG_ERR, "%s: invalid UDP packet from %s", 682 iface->name, inet_ntoa(from)); 683 continue; 684 } 685 i = whitelisted_ip(iface->state->options, from.s_addr); 686 if (i == 0) { 687 syslog(LOG_WARNING, 688 "%s: non whitelisted DHCP packet from %s", 689 iface->name, inet_ntoa(from)); 690 continue; 691 } else if (i != 1 && 692 blacklisted_ip(iface->state->options, from.s_addr) == 1) 693 { 694 syslog(LOG_WARNING, 695 "%s: blacklisted DHCP packet from %s", 696 iface->name, inet_ntoa(from)); 697 continue; 698 } 699 if (iface->flags & IFF_POINTOPOINT && 700 iface->dst.s_addr != from.s_addr) 701 { 702 syslog(LOG_WARNING, 703 "%s: server %s is not destination", 704 iface->name, inet_ntoa(from)); 705 } 706 bytes = get_udp_data(&pp, packet); 707 if ((size_t)bytes > sizeof(*dhcp)) { 708 syslog(LOG_ERR, 709 "%s: packet greater than DHCP size from %s", 710 iface->name, inet_ntoa(from)); 711 continue; 712 } 713 if (!dhcp) 714 dhcp = xzalloc(sizeof(*dhcp)); 715 memcpy(dhcp, pp, bytes); 716 if (dhcp->cookie != htonl(MAGIC_COOKIE)) { 717 syslog(LOG_DEBUG, "%s: bogus cookie from %s", 718 iface->name, inet_ntoa(from)); 719 continue; 720 } 721 /* Ensure it's the right transaction */ 722 if (iface->state->xid != dhcp->xid) { 723 syslog(LOG_DEBUG, 724 "%s: wrong xid 0x%x (expecting 0x%x) from %s", 725 iface->name, dhcp->xid, iface->state->xid, 726 inet_ntoa(from)); 727 continue; 728 } 729 /* Ensure packet is for us */ 730 if (iface->hwlen <= sizeof(dhcp->chaddr) && 731 memcmp(dhcp->chaddr, iface->hwaddr, iface->hwlen)) 732 { 733 syslog(LOG_DEBUG, "%s: xid 0x%x is not for hwaddr %s", 734 iface->name, dhcp->xid, 735 hwaddr_ntoa(dhcp->chaddr, sizeof(dhcp->chaddr))); 736 continue; 737 } 738 handle_dhcp(iface, &dhcp, &from); 739 if (iface->raw_fd == -1) 740 break; 741 } 742 free(packet); 743 free(dhcp); 744 } 745 746 static void 747 send_release(struct interface *iface) 748 { 749 struct timespec ts; 750 751 if (iface->state->new != NULL && 752 iface->state->new->cookie == htonl(MAGIC_COOKIE)) 753 { 754 syslog(LOG_INFO, "%s: releasing lease of %s", 755 iface->name, inet_ntoa(iface->state->lease.addr)); 756 iface->state->xid = dhcp_xid(iface); 757 send_message(iface, DHCP_RELEASE, NULL); 758 /* Give the packet a chance to go before dropping the ip */ 759 ts.tv_sec = RELEASE_DELAY_S; 760 ts.tv_nsec = RELEASE_DELAY_NS; 761 nanosleep(&ts, NULL); 762 drop_dhcp(iface, "RELEASE"); 763 } 764 unlink(iface->leasefile); 765 } 766 767 void 768 send_decline(struct interface *iface) 769 { 770 send_message(iface, DHCP_DECLINE, NULL); 771 } 772 773 static void 774 configure_interface1(struct interface *iface) 775 { 776 struct if_state *ifs = iface->state; 777 struct if_options *ifo = ifs->options; 778 uint8_t *duid; 779 size_t len = 0, ifl; 780 781 /* Do any platform specific configuration */ 782 if_conf(iface); 783 784 if (iface->flags & IFF_POINTOPOINT && !(ifo->options & DHCPCD_INFORM)) 785 ifo->options |= DHCPCD_STATIC; 786 if (iface->flags & IFF_NOARP || 787 ifo->options & (DHCPCD_INFORM | DHCPCD_STATIC)) 788 ifo->options &= ~(DHCPCD_ARP | DHCPCD_IPV4LL); 789 if (!(iface->flags & (IFF_POINTOPOINT | IFF_LOOPBACK | IFF_MULTICAST))) 790 ifo->options &= ~DHCPCD_IPV6RS; 791 if (ifo->options & DHCPCD_LINK && carrier_status(iface) == -1) 792 ifo->options &= ~DHCPCD_LINK; 793 794 if (ifo->metric != -1) 795 iface->metric = ifo->metric; 796 797 /* If we haven't specified a ClientID and our hardware address 798 * length is greater than DHCP_CHADDR_LEN then we enforce a ClientID 799 * of the hardware address family and the hardware address. */ 800 if (iface->hwlen > DHCP_CHADDR_LEN) 801 ifo->options |= DHCPCD_CLIENTID; 802 803 /* Firewire and InfiniBand interfaces require ClientID and 804 * the broadcast option being set. */ 805 switch (iface->family) { 806 case ARPHRD_IEEE1394: /* FALLTHROUGH */ 807 case ARPHRD_INFINIBAND: 808 ifo->options |= DHCPCD_CLIENTID | DHCPCD_BROADCAST; 809 break; 810 } 811 812 free(iface->clientid); 813 iface->clientid = NULL; 814 if (*ifo->clientid) { 815 iface->clientid = xmalloc(ifo->clientid[0] + 1); 816 memcpy(iface->clientid, ifo->clientid, ifo->clientid[0] + 1); 817 } else if (ifo->options & DHCPCD_CLIENTID) { 818 if (ifo->options & DHCPCD_DUID) { 819 duid = xmalloc(DUID_LEN); 820 if ((len = get_duid(duid, iface)) == 0) 821 syslog(LOG_ERR, "get_duid: %m"); 822 } 823 if (len > 0) { 824 iface->clientid = xmalloc(len + 6); 825 iface->clientid[0] = len + 5; 826 iface->clientid[1] = 255; /* RFC 4361 */ 827 ifl = strlen(iface->name); 828 if (ifl < 5) { 829 memcpy(iface->clientid + 2, iface->name, ifl); 830 if (ifl < 4) 831 memset(iface->clientid + 2 + ifl, 832 0, 4 - ifl); 833 } else { 834 ifl = htonl(if_nametoindex(iface->name)); 835 memcpy(iface->clientid + 2, &ifl, 4); 836 } 837 } else if (len == 0) { 838 len = iface->hwlen + 1; 839 iface->clientid = xmalloc(len + 1); 840 iface->clientid[0] = len; 841 iface->clientid[1] = iface->family; 842 memcpy(iface->clientid + 2, iface->hwaddr, 843 iface->hwlen); 844 } 845 } 846 if (ifo->options & DHCPCD_CLIENTID) 847 syslog(LOG_DEBUG, "%s: using ClientID %s", iface->name, 848 hwaddr_ntoa(iface->clientid + 1, *iface->clientid)); 849 else if (iface->hwlen) 850 syslog(LOG_DEBUG, "%s: using hwaddr %s", iface->name, 851 hwaddr_ntoa(iface->hwaddr, iface->hwlen)); 852 } 853 854 int 855 select_profile(struct interface *iface, const char *profile) 856 { 857 struct if_options *ifo; 858 int ret; 859 860 ret = 0; 861 ifo = read_config(cffile, iface->name, iface->ssid, profile); 862 if (ifo == NULL) { 863 syslog(LOG_DEBUG, "%s: no profile %s", iface->name, profile); 864 ret = -1; 865 goto exit; 866 } 867 if (profile != NULL) { 868 strlcpy(iface->state->profile, profile, 869 sizeof(iface->state->profile)); 870 syslog(LOG_INFO, "%s: selected profile %s", 871 iface->name, profile); 872 } else 873 *iface->state->profile = '\0'; 874 free_options(iface->state->options); 875 iface->state->options = ifo; 876 877 exit: 878 if (profile) 879 configure_interface1(iface); 880 return ret; 881 } 882 883 static void 884 start_fallback(void *arg) 885 { 886 struct interface *iface; 887 888 iface = (struct interface *)arg; 889 select_profile(iface, iface->state->options->fallback); 890 start_interface(iface); 891 } 892 893 static void 894 configure_interface(struct interface *iface, int argc, char **argv) 895 { 896 select_profile(iface, NULL); 897 add_options(iface->state->options, argc, argv); 898 configure_interface1(iface); 899 } 900 901 void 902 handle_carrier(int action, int flags, const char *ifname) 903 { 904 struct interface *iface; 905 int carrier; 906 907 if (!(options & DHCPCD_LINK)) 908 return; 909 for (iface = ifaces; iface; iface = iface->next) 910 if (strcmp(iface->name, ifname) == 0) 911 break; 912 if (!iface) { 913 if (options & DHCPCD_LINK) 914 handle_interface(1, ifname); 915 return; 916 } 917 if (!(iface->state->options->options & DHCPCD_LINK)) 918 return; 919 920 if (action) { 921 carrier = action == 1 ? 1 : 0; 922 iface->flags = flags; 923 } else 924 carrier = carrier_status(iface); 925 926 if (carrier == -1) 927 syslog(LOG_ERR, "%s: carrier_status: %m", ifname); 928 else if (carrier == 0 || ~iface->flags & IFF_UP) { 929 if (iface->carrier != LINK_DOWN) { 930 iface->carrier = LINK_DOWN; 931 syslog(LOG_INFO, "%s: carrier lost", iface->name); 932 close_sockets(iface); 933 delete_timeouts(iface, start_expire, NULL); 934 if (iface->ras) { 935 ipv6rs_free(iface); 936 iface->ras = NULL; 937 run_script_reason(iface, "ROUTERADVERT"); 938 } 939 drop_dhcp(iface, "NOCARRIER"); 940 } 941 } else if (carrier == 1 && !(~iface->flags & IFF_UP)) { 942 if (iface->carrier != LINK_UP) { 943 iface->carrier = LINK_UP; 944 syslog(LOG_INFO, "%s: carrier acquired", iface->name); 945 if (iface->wireless) 946 getifssid(iface->name, iface->ssid); 947 configure_interface(iface, margc, margv); 948 iface->state->interval = 0; 949 iface->state->reason = "CARRIER"; 950 run_script(iface); 951 start_interface(iface); 952 } 953 } 954 } 955 956 void 957 start_discover(void *arg) 958 { 959 struct interface *iface = arg; 960 struct if_options *ifo = iface->state->options; 961 int timeout = ifo->timeout; 962 963 /* If we're rebooting and we're not daemonised then we need 964 * to shorten the normal timeout to ensure we try correctly 965 * for a fallback or IPv4LL address. */ 966 if (iface->state->state == DHS_REBOOT && 967 !(options & DHCPCD_DAEMONISED)) 968 { 969 timeout -= ifo->reboot; 970 if (timeout <= 0) 971 timeout = 2; 972 } 973 974 iface->state->state = DHS_DISCOVER; 975 iface->state->xid = dhcp_xid(iface); 976 delete_timeout(NULL, iface); 977 if (ifo->fallback) 978 add_timeout_sec(timeout, start_fallback, iface); 979 else if (ifo->options & DHCPCD_IPV4LL && 980 !IN_LINKLOCAL(htonl(iface->addr.s_addr))) 981 { 982 if (IN_LINKLOCAL(htonl(iface->state->fail.s_addr))) 983 add_timeout_sec(RATE_LIMIT_INTERVAL, start_ipv4ll, iface); 984 else 985 add_timeout_sec(timeout, start_ipv4ll, iface); 986 } 987 if (ifo->options & DHCPCD_REQUEST) 988 syslog(LOG_INFO, "%s: broadcasting for a lease (requesting %s)", 989 iface->name, inet_ntoa(ifo->req_addr)); 990 else 991 syslog(LOG_INFO, "%s: broadcasting for a lease", iface->name); 992 send_discover(iface); 993 } 994 995 void 996 start_request(void *arg) 997 { 998 struct interface *iface = arg; 999 1000 iface->state->state = DHS_REQUEST; 1001 send_request(iface); 1002 } 1003 1004 void 1005 start_renew(void *arg) 1006 { 1007 struct interface *iface = arg; 1008 1009 syslog(LOG_INFO, "%s: renewing lease of %s", 1010 iface->name, inet_ntoa(iface->state->lease.addr)); 1011 iface->state->state = DHS_RENEW; 1012 iface->state->xid = dhcp_xid(iface); 1013 send_renew(iface); 1014 } 1015 1016 void 1017 start_rebind(void *arg) 1018 { 1019 struct interface *iface = arg; 1020 1021 syslog(LOG_ERR, "%s: failed to renew, attempting to rebind", 1022 iface->name); 1023 iface->state->state = DHS_REBIND; 1024 delete_timeout(send_renew, iface); 1025 iface->state->lease.server.s_addr = 0; 1026 send_rebind(iface); 1027 } 1028 1029 static void 1030 start_timeout(void *arg) 1031 { 1032 struct interface *iface = arg; 1033 1034 bind_interface(iface); 1035 iface->state->interval = 0; 1036 start_discover(iface); 1037 } 1038 1039 static struct dhcp_message * 1040 dhcp_message_new(struct in_addr *addr, struct in_addr *mask) 1041 { 1042 struct dhcp_message *dhcp; 1043 uint8_t *p; 1044 1045 dhcp = xzalloc(sizeof(*dhcp)); 1046 dhcp->yiaddr = addr->s_addr; 1047 p = dhcp->options; 1048 if (mask && mask->s_addr != INADDR_ANY) { 1049 *p++ = DHO_SUBNETMASK; 1050 *p++ = sizeof(mask->s_addr); 1051 memcpy(p, &mask->s_addr, sizeof(mask->s_addr)); 1052 p+= sizeof(mask->s_addr); 1053 } 1054 *p++ = DHO_END; 1055 return dhcp; 1056 } 1057 1058 static int 1059 handle_3rdparty(struct interface *iface) 1060 { 1061 struct if_options *ifo; 1062 struct in_addr addr, net, dst; 1063 1064 ifo = iface->state->options; 1065 if (ifo->req_addr.s_addr != INADDR_ANY) 1066 return 0; 1067 1068 if (get_address(iface->name, &addr, &net, &dst) == 1) 1069 handle_ifa(RTM_NEWADDR, iface->name, &addr, &net, &dst); 1070 else { 1071 syslog(LOG_INFO, 1072 "%s: waiting for 3rd party to configure IP address", 1073 iface->name); 1074 iface->state->reason = "3RDPARTY"; 1075 run_script(iface); 1076 } 1077 return 1; 1078 } 1079 1080 static void 1081 start_static(struct interface *iface) 1082 { 1083 struct if_options *ifo; 1084 1085 if (handle_3rdparty(iface)) 1086 return; 1087 ifo = iface->state->options; 1088 iface->state->offer = 1089 dhcp_message_new(&ifo->req_addr, &ifo->req_mask); 1090 delete_timeout(NULL, iface); 1091 bind_interface(iface); 1092 } 1093 1094 static void 1095 start_inform(struct interface *iface) 1096 { 1097 if (handle_3rdparty(iface)) 1098 return; 1099 1100 if (options & DHCPCD_TEST) { 1101 iface->addr.s_addr = iface->state->options->req_addr.s_addr; 1102 iface->net.s_addr = iface->state->options->req_mask.s_addr; 1103 } else { 1104 iface->state->options->options |= DHCPCD_STATIC; 1105 start_static(iface); 1106 } 1107 1108 iface->state->state = DHS_INFORM; 1109 iface->state->xid = dhcp_xid(iface); 1110 send_inform(iface); 1111 } 1112 1113 void 1114 start_reboot(struct interface *iface) 1115 { 1116 struct if_options *ifo = iface->state->options; 1117 1118 if (ifo->options & DHCPCD_LINK && iface->carrier == LINK_DOWN) { 1119 syslog(LOG_INFO, "%s: waiting for carrier", iface->name); 1120 return; 1121 } 1122 if (ifo->options & DHCPCD_STATIC) { 1123 start_static(iface); 1124 return; 1125 } 1126 if (ifo->reboot == 0 || iface->state->offer == NULL) { 1127 start_discover(iface); 1128 return; 1129 } 1130 if (ifo->options & DHCPCD_INFORM) { 1131 syslog(LOG_INFO, "%s: informing address of %s", 1132 iface->name, inet_ntoa(iface->state->lease.addr)); 1133 } else if (iface->state->offer->cookie == 0) { 1134 if (ifo->options & DHCPCD_IPV4LL) { 1135 iface->state->claims = 0; 1136 send_arp_announce(iface); 1137 } else 1138 start_discover(iface); 1139 return; 1140 } else { 1141 syslog(LOG_INFO, "%s: rebinding lease of %s", 1142 iface->name, inet_ntoa(iface->state->lease.addr)); 1143 } 1144 iface->state->state = DHS_REBOOT; 1145 iface->state->xid = dhcp_xid(iface); 1146 iface->state->lease.server.s_addr = 0; 1147 delete_timeout(NULL, iface); 1148 if (ifo->fallback) 1149 add_timeout_sec(ifo->reboot, start_fallback, iface); 1150 else if (ifo->options & DHCPCD_LASTLEASE && 1151 iface->state->lease.frominfo) 1152 add_timeout_sec(ifo->reboot, start_timeout, iface); 1153 else if (!(ifo->options & DHCPCD_INFORM && 1154 options & (DHCPCD_MASTER | DHCPCD_DAEMONISED))) 1155 add_timeout_sec(ifo->reboot, start_expire, iface); 1156 /* Don't bother ARP checking as the server could NAK us first. */ 1157 if (ifo->options & DHCPCD_INFORM) 1158 send_inform(iface); 1159 else 1160 send_request(iface); 1161 } 1162 1163 void 1164 start_interface(void *arg) 1165 { 1166 struct interface *iface = arg; 1167 struct if_options *ifo = iface->state->options; 1168 struct stat st; 1169 struct timeval now; 1170 uint32_t l; 1171 int nolease; 1172 1173 handle_carrier(0, 0, iface->name); 1174 if (iface->carrier == LINK_DOWN) { 1175 syslog(LOG_INFO, "%s: waiting for carrier", iface->name); 1176 return; 1177 } 1178 1179 iface->start_uptime = uptime(); 1180 free(iface->state->offer); 1181 iface->state->offer = NULL; 1182 1183 if (options & DHCPCD_IPV6RS && ifo->options & DHCPCD_IPV6RS) { 1184 if (check_ipv6(iface->name) == 1) 1185 ipv6rs_start(iface); 1186 else 1187 ifo->options &= ~DHCPCD_IPV6RS; 1188 } 1189 1190 if (iface->state->arping_index < ifo->arping_len) { 1191 start_arping(iface); 1192 return; 1193 } 1194 if (ifo->options & DHCPCD_STATIC) { 1195 start_static(iface); 1196 return; 1197 } 1198 if (ifo->options & DHCPCD_INFORM) { 1199 start_inform(iface); 1200 return; 1201 } 1202 if (iface->hwlen == 0 && ifo->clientid[0] == '\0') { 1203 syslog(LOG_WARNING, "%s: needs a clientid to configure", 1204 iface->name); 1205 drop_dhcp(iface, "FAIL"); 1206 close_sockets(iface); 1207 delete_timeout(NULL, iface); 1208 return; 1209 } 1210 /* We don't want to read the old lease if we NAK an old test */ 1211 nolease = iface->state->offer && options & DHCPCD_TEST; 1212 if (!nolease) 1213 iface->state->offer = read_lease(iface); 1214 if (iface->state->offer) { 1215 get_lease(&iface->state->lease, iface->state->offer); 1216 iface->state->lease.frominfo = 1; 1217 if (iface->state->offer->cookie == 0) { 1218 if (iface->state->offer->yiaddr == 1219 iface->addr.s_addr) 1220 { 1221 free(iface->state->offer); 1222 iface->state->offer = NULL; 1223 } 1224 } else if (iface->state->lease.leasetime != ~0U && 1225 stat(iface->leasefile, &st) == 0) 1226 { 1227 /* Offset lease times and check expiry */ 1228 gettimeofday(&now, NULL); 1229 if ((time_t)iface->state->lease.leasetime < 1230 (time_t)(now.tv_sec - st.st_mtime)) 1231 { 1232 syslog(LOG_DEBUG, 1233 "%s: discarding expired lease", 1234 iface->name); 1235 free(iface->state->offer); 1236 iface->state->offer = NULL; 1237 iface->state->lease.addr.s_addr = 0; 1238 } else { 1239 l = now.tv_sec - st.st_mtime; 1240 iface->state->lease.leasetime -= l; 1241 iface->state->lease.renewaltime -= l; 1242 iface->state->lease.rebindtime -= l; 1243 } 1244 } 1245 } 1246 if (iface->state->offer == NULL) 1247 start_discover(iface); 1248 else if (iface->state->offer->cookie == 0 && 1249 iface->state->options->options & DHCPCD_IPV4LL) 1250 start_ipv4ll(iface); 1251 else 1252 start_reboot(iface); 1253 } 1254 1255 static void 1256 init_state(struct interface *iface, int argc, char **argv) 1257 { 1258 struct if_state *ifs; 1259 1260 if (iface->state) 1261 ifs = iface->state; 1262 else 1263 ifs = iface->state = xzalloc(sizeof(*ifs)); 1264 1265 ifs->state = DHS_INIT; 1266 ifs->reason = "PREINIT"; 1267 ifs->nakoff = 1; 1268 configure_interface(iface, argc, argv); 1269 if (!(options & DHCPCD_TEST)) 1270 run_script(iface); 1271 /* We need to drop the leasefile so that start_interface 1272 * doesn't load it. */ 1273 if (ifs->options->options & DHCPCD_REQUEST) 1274 unlink(iface->leasefile); 1275 1276 if (ifs->options->options & DHCPCD_LINK) { 1277 switch (carrier_status(iface)) { 1278 case 0: 1279 iface->carrier = LINK_DOWN; 1280 ifs->reason = "NOCARRIER"; 1281 break; 1282 case 1: 1283 iface->carrier = LINK_UP; 1284 ifs->reason = "CARRIER"; 1285 break; 1286 default: 1287 iface->carrier = LINK_UNKNOWN; 1288 return; 1289 } 1290 if (!(options & DHCPCD_TEST)) 1291 run_script(iface); 1292 } else 1293 iface->carrier = LINK_UNKNOWN; 1294 } 1295 1296 void 1297 handle_interface(int action, const char *ifname) 1298 { 1299 struct interface *ifs, *ifp, *ifn, *ifl = NULL; 1300 const char * const argv[] = { ifname }; 1301 int i; 1302 1303 if (action == -1) { 1304 ifp = find_interface(ifname); 1305 if (ifp != NULL) 1306 stop_interface(ifp); 1307 return; 1308 } 1309 1310 /* If running off an interface list, check it's in it. */ 1311 if (ifc) { 1312 for (i = 0; i < ifc; i++) 1313 if (strcmp(ifv[i], ifname) == 0) 1314 break; 1315 if (i >= ifc) 1316 return; 1317 } 1318 1319 ifs = discover_interfaces(-1, UNCONST(argv)); 1320 for (ifp = ifs; ifp; ifp = ifp->next) { 1321 if (strcmp(ifp->name, ifname) != 0) 1322 continue; 1323 /* Check if we already have the interface */ 1324 for (ifn = ifaces; ifn; ifn = ifn->next) { 1325 if (strcmp(ifn->name, ifp->name) == 0) 1326 break; 1327 ifl = ifn; 1328 } 1329 if (ifn) { 1330 /* The flags and hwaddr could have changed */ 1331 ifn->flags = ifp->flags; 1332 ifn->hwlen = ifp->hwlen; 1333 if (ifp->hwlen != 0) 1334 memcpy(ifn->hwaddr, ifp->hwaddr, ifn->hwlen); 1335 } else { 1336 if (ifl) 1337 ifl->next = ifp; 1338 else 1339 ifaces = ifp; 1340 } 1341 init_state(ifp, 0, NULL); 1342 start_interface(ifp); 1343 } 1344 } 1345 1346 #ifdef RTM_CHGADDR 1347 void 1348 handle_hwaddr(const char *ifname, unsigned char *hwaddr, size_t hwlen) 1349 { 1350 struct interface *ifp; 1351 struct if_options *ifo; 1352 1353 for (ifp = ifaces; ifp; ifp = ifp->next) 1354 if (strcmp(ifp->name, ifname) == 0 && ifp->hwlen <= hwlen) { 1355 ifo = ifp->state->options; 1356 if (!(ifo->options & 1357 (DHCPCD_INFORM | DHCPCD_STATIC | DHCPCD_CLIENTID)) 1358 && ifp->state->new != NULL && 1359 ifp->state->new->cookie == htonl(MAGIC_COOKIE)) 1360 { 1361 syslog(LOG_INFO, 1362 "%s: expiring for new hardware address", 1363 ifp->name); 1364 drop_dhcp(ifp, "EXPIRE"); 1365 } 1366 memcpy(ifp->hwaddr, hwaddr, hwlen); 1367 ifp->hwlen = hwlen; 1368 if (!(ifo->options & 1369 (DHCPCD_INFORM | DHCPCD_STATIC | DHCPCD_CLIENTID))) 1370 { 1371 syslog(LOG_DEBUG, "%s: using hwaddr %s", 1372 ifp->name, 1373 hwaddr_ntoa(ifp->hwaddr, ifp->hwlen)); 1374 ifp->state->interval = 0; 1375 ifp->state->nakoff = 1; 1376 start_interface(ifp); 1377 } 1378 } 1379 free(hwaddr); 1380 } 1381 #endif 1382 1383 void 1384 handle_ifa(int type, const char *ifname, 1385 struct in_addr *addr, struct in_addr *net, struct in_addr *dst) 1386 { 1387 struct interface *ifp; 1388 struct if_options *ifo; 1389 int i; 1390 1391 if (addr->s_addr == INADDR_ANY) 1392 return; 1393 for (ifp = ifaces; ifp; ifp = ifp->next) 1394 if (strcmp(ifp->name, ifname) == 0) 1395 break; 1396 if (ifp == NULL) 1397 return; 1398 1399 if (type == RTM_DELADDR) { 1400 if (ifp->state->new && 1401 ifp->state->new->yiaddr == addr->s_addr) 1402 syslog(LOG_INFO, "%s: removing IP address %s/%d", 1403 ifp->name, inet_ntoa(ifp->state->lease.addr), 1404 inet_ntocidr(ifp->state->lease.net)); 1405 return; 1406 } 1407 1408 if (type != RTM_NEWADDR) 1409 return; 1410 1411 ifo = ifp->state->options; 1412 if ((ifo->options & (DHCPCD_INFORM | DHCPCD_STATIC)) == 0 || 1413 ifo->req_addr.s_addr != INADDR_ANY) 1414 return; 1415 1416 free(ifp->state->old); 1417 ifp->state->old = ifp->state->new; 1418 ifp->state->new = dhcp_message_new(addr, net); 1419 ifp->dst.s_addr = dst ? dst->s_addr : INADDR_ANY; 1420 if (dst) { 1421 for (i = 1; i < 255; i++) 1422 if (i != DHO_ROUTER && has_option_mask(ifo->dstmask,i)) 1423 dhcp_message_add_addr(ifp->state->new, i, *dst); 1424 } 1425 ifp->state->reason = "STATIC"; 1426 build_routes(); 1427 run_script(ifp); 1428 if (ifo->options & DHCPCD_INFORM) { 1429 ifp->state->state = DHS_INFORM; 1430 ifp->state->xid = dhcp_xid(ifp); 1431 ifp->state->lease.server.s_addr = 1432 dst ? dst->s_addr : INADDR_ANY; 1433 ifp->addr = *addr; 1434 ifp->net = *net; 1435 send_inform(ifp); 1436 } 1437 } 1438 1439 /* ARGSUSED */ 1440 static void 1441 handle_link(_unused void *arg) 1442 { 1443 if (manage_link(linkfd) == -1) 1444 syslog(LOG_ERR, "manage_link: %m"); 1445 } 1446 1447 static void 1448 if_reboot(struct interface *iface, int argc, char **argv) 1449 { 1450 const struct if_options *ifo; 1451 int opt; 1452 1453 ifo = iface->state->options; 1454 opt = ifo->options; 1455 configure_interface(iface, argc, argv); 1456 ifo = iface->state->options; 1457 iface->state->interval = 0; 1458 if ((ifo->options & (DHCPCD_INFORM | DHCPCD_STATIC) && 1459 iface->addr.s_addr != ifo->req_addr.s_addr) || 1460 (opt & (DHCPCD_INFORM | DHCPCD_STATIC) && 1461 !(ifo->options & (DHCPCD_INFORM | DHCPCD_STATIC)))) 1462 { 1463 drop_dhcp(iface, "EXPIRE"); 1464 } else { 1465 free(iface->state->offer); 1466 iface->state->offer = NULL; 1467 } 1468 start_interface(iface); 1469 } 1470 1471 static void 1472 reconf_reboot(int action, int argc, char **argv, int oi) 1473 { 1474 struct interface *ifl, *ifn, *ifp, *ifs, *ift; 1475 1476 ifs = discover_interfaces(argc - oi, argv + oi); 1477 if (ifs == NULL) 1478 return; 1479 1480 for (ifp = ifs; ifp && (ift = ifp->next, 1); ifp = ift) { 1481 ifl = NULL; 1482 for (ifn = ifaces; ifn; ifn = ifn->next) { 1483 if (strcmp(ifn->name, ifp->name) == 0) 1484 break; 1485 ifl = ifn; 1486 } 1487 if (ifn) { 1488 if (action) 1489 if_reboot(ifn, argc, argv); 1490 else if (ifn->state->new) 1491 configure(ifn); 1492 free_interface(ifp); 1493 } else { 1494 ifp->next = NULL; 1495 init_state(ifp, argc, argv); 1496 start_interface(ifp); 1497 if (ifl) 1498 ifl->next = ifp; 1499 else 1500 ifaces = ifp; 1501 } 1502 } 1503 1504 sort_interfaces(); 1505 } 1506 1507 /* ARGSUSED */ 1508 static void 1509 handle_signal(_unused void *arg) 1510 { 1511 struct interface *ifp, *ifl; 1512 struct if_options *ifo; 1513 int sig = signal_read(); 1514 int do_release, do_rebind, i; 1515 1516 do_rebind = do_release = 0; 1517 switch (sig) { 1518 case SIGINT: 1519 syslog(LOG_INFO, "received SIGINT, stopping"); 1520 break; 1521 case SIGTERM: 1522 syslog(LOG_INFO, "received SIGTERM, stopping"); 1523 break; 1524 case SIGALRM: 1525 #ifdef ANDROID 1526 syslog(LOG_INFO, "received SIGALRM, renewing"); 1527 for (ifp = ifaces; ifp; ifp = ifp->next) { 1528 start_renew(ifp); 1529 } 1530 #else 1531 syslog(LOG_INFO, "received SIGALRM, rebinding"); 1532 for (i = 0; i < ifac; i++) 1533 free(ifav[i]); 1534 free(ifav); 1535 ifav = NULL; 1536 ifac = 0; 1537 for (i = 0; i < ifdc; i++) 1538 free(ifdv[i]); 1539 free(ifdv); 1540 ifdc = 0; 1541 ifdv = NULL; 1542 ifo = read_config(cffile, NULL, NULL, NULL); 1543 add_options(ifo, margc, margv); 1544 /* We need to preserve these two options. */ 1545 if (options & DHCPCD_MASTER) 1546 ifo->options |= DHCPCD_MASTER; 1547 if (options & DHCPCD_DAEMONISED) 1548 ifo->options |= DHCPCD_DAEMONISED; 1549 options = ifo->options; 1550 free_options(ifo); 1551 reconf_reboot(1, ifc, ifv, 0); 1552 #endif 1553 return; 1554 case SIGHUP: 1555 syslog(LOG_INFO, "received SIGHUP, releasing"); 1556 do_release = 1; 1557 break; 1558 case SIGUSR1: 1559 syslog(LOG_INFO, "received SIGUSR, reconfiguring"); 1560 for (ifp = ifaces; ifp; ifp = ifp->next) 1561 if (ifp->state->new) 1562 configure(ifp); 1563 return; 1564 case SIGPIPE: 1565 syslog(LOG_WARNING, "received SIGPIPE"); 1566 return; 1567 default: 1568 syslog(LOG_ERR, 1569 "received signal %d, but don't know what to do with it", 1570 sig); 1571 return; 1572 } 1573 1574 if (options & DHCPCD_TEST) 1575 exit(EXIT_FAILURE); 1576 1577 /* As drop_dhcp could re-arrange the order, we do it like this. */ 1578 for (;;) { 1579 /* Be sane and drop the last config first */ 1580 ifl = NULL; 1581 for (ifp = ifaces; ifp; ifp = ifp->next) { 1582 if (ifp->next == NULL) 1583 break; 1584 ifl = ifp; 1585 } 1586 if (ifp == NULL) 1587 break; 1588 if (ifp->carrier != LINK_DOWN && 1589 (do_release || 1590 ifp->state->options->options & DHCPCD_RELEASE)) 1591 send_release(ifp); 1592 stop_interface(ifp); 1593 } 1594 exit(EXIT_FAILURE); 1595 } 1596 1597 int 1598 handle_args(struct fd_list *fd, int argc, char **argv) 1599 { 1600 struct interface *ifp; 1601 int do_exit = 0, do_release = 0, do_reboot = 0, do_reconf = 0; 1602 int opt, oi = 0; 1603 ssize_t len; 1604 size_t l; 1605 struct iovec iov[2]; 1606 char *tmp, *p; 1607 1608 if (fd != NULL) { 1609 /* Special commands for our control socket */ 1610 if (strcmp(*argv, "--version") == 0) { 1611 len = strlen(VERSION) + 1; 1612 iov[0].iov_base = &len; 1613 iov[0].iov_len = sizeof(ssize_t); 1614 iov[1].iov_base = UNCONST(VERSION); 1615 iov[1].iov_len = len; 1616 if (writev(fd->fd, iov, 2) == -1) { 1617 syslog(LOG_ERR, "writev: %m"); 1618 return -1; 1619 } 1620 return 0; 1621 } else if (strcmp(*argv, "--getconfigfile") == 0) { 1622 len = strlen(cffile ? cffile : CONFIG) + 1; 1623 iov[0].iov_base = &len; 1624 iov[0].iov_len = sizeof(ssize_t); 1625 iov[1].iov_base = cffile ? cffile : UNCONST(CONFIG); 1626 iov[1].iov_len = len; 1627 if (writev(fd->fd, iov, 2) == -1) { 1628 syslog(LOG_ERR, "writev: %m"); 1629 return -1; 1630 } 1631 return 0; 1632 } else if (strcmp(*argv, "--getinterfaces") == 0) { 1633 len = 0; 1634 if (argc == 1) { 1635 for (ifp = ifaces; ifp; ifp = ifp->next) { 1636 len++; 1637 if (ifp->ras) 1638 len++; 1639 } 1640 len = write(fd->fd, &len, sizeof(len)); 1641 if (len != sizeof(len)) 1642 return -1; 1643 for (ifp = ifaces; ifp; ifp = ifp->next) 1644 send_interface(fd->fd, ifp); 1645 return 0; 1646 } 1647 opt = 0; 1648 while (argv[++opt] != NULL) { 1649 for (ifp = ifaces; ifp; ifp = ifp->next) 1650 if (strcmp(argv[opt], ifp->name) == 0) { 1651 len++; 1652 if (ifp->ras) 1653 len++; 1654 } 1655 } 1656 len = write(fd->fd, &len, sizeof(len)); 1657 if (len != sizeof(len)) 1658 return -1; 1659 opt = 0; 1660 while (argv[++opt] != NULL) { 1661 for (ifp = ifaces; ifp; ifp = ifp->next) 1662 if (strcmp(argv[opt], ifp->name) == 0) 1663 send_interface(fd->fd, ifp); 1664 } 1665 return 0; 1666 } else if (strcmp(*argv, "--listen") == 0) { 1667 fd->listener = 1; 1668 return 0; 1669 } 1670 } 1671 1672 /* Log the command */ 1673 len = 0; 1674 for (opt = 0; opt < argc; opt++) 1675 len += strlen(argv[opt]) + 1; 1676 tmp = p = xmalloc(len + 1); 1677 for (opt = 0; opt < argc; opt++) { 1678 l = strlen(argv[opt]); 1679 strlcpy(p, argv[opt], l + 1); 1680 p += l; 1681 *p++ = ' '; 1682 } 1683 *--p = '\0'; 1684 syslog(LOG_INFO, "control command: %s", tmp); 1685 free(tmp); 1686 1687 optind = 0; 1688 while ((opt = getopt_long(argc, argv, IF_OPTS, cf_options, &oi)) != -1) 1689 { 1690 switch (opt) { 1691 case 'g': 1692 do_reconf = 1; 1693 break; 1694 case 'k': 1695 do_release = 1; 1696 break; 1697 case 'n': 1698 do_reboot = 1; 1699 break; 1700 case 'x': 1701 do_exit = 1; 1702 break; 1703 } 1704 } 1705 1706 /* We need at least one interface */ 1707 if (optind == argc) { 1708 syslog(LOG_ERR, "handle_args: no interface"); 1709 return -1; 1710 } 1711 1712 if (do_release || do_exit) { 1713 for (oi = optind; oi < argc; oi++) { 1714 for (ifp = ifaces; ifp; ifp = ifp->next) 1715 if (strcmp(ifp->name, argv[oi]) == 0) 1716 break; 1717 if (!ifp) 1718 continue; 1719 if (do_release) 1720 ifp->state->options->options |= DHCPCD_RELEASE; 1721 if (ifp->state->options->options & DHCPCD_RELEASE && 1722 ifp->carrier != LINK_DOWN) 1723 send_release(ifp); 1724 stop_interface(ifp); 1725 } 1726 return 0; 1727 } 1728 1729 reconf_reboot(do_reboot, argc, argv, optind); 1730 return 0; 1731 } 1732 1733 void 1734 open_sockets(struct interface *iface) 1735 { 1736 if (iface->raw_fd == -1) { 1737 if (open_socket(iface, ETHERTYPE_IP) == -1) 1738 syslog(LOG_ERR, "%s: open_socket: %m", iface->name); 1739 else 1740 add_event(iface->raw_fd, handle_dhcp_packet, iface); 1741 } 1742 if (iface->udp_fd == -1 && 1743 iface->addr.s_addr != 0 && 1744 iface->state->new != NULL && 1745 (iface->state->new->cookie == htonl(MAGIC_COOKIE) || 1746 iface->state->options->options & DHCPCD_INFORM)) 1747 { 1748 if (open_udp_socket(iface) == -1 && errno != EADDRINUSE) 1749 syslog(LOG_ERR, "%s: open_udp_socket: %m", iface->name); 1750 } 1751 } 1752 1753 void 1754 close_sockets(struct interface *iface) 1755 { 1756 if (iface->arp_fd != -1) { 1757 delete_event(iface->arp_fd); 1758 close(iface->arp_fd); 1759 iface->arp_fd = -1; 1760 } 1761 if (iface->raw_fd != -1) { 1762 delete_event(iface->raw_fd); 1763 close(iface->raw_fd); 1764 iface->raw_fd = -1; 1765 } 1766 if (iface->udp_fd != -1) { 1767 /* we don't listen to events on the udp */ 1768 close(iface->udp_fd); 1769 iface->udp_fd = -1; 1770 } 1771 } 1772 1773 #ifdef ANDROID 1774 void switchUser(void) 1775 { 1776 gid_t groups[] = { AID_INET, AID_SHELL }; 1777 struct __user_cap_header_struct header; 1778 struct __user_cap_data_struct cap; 1779 1780 setgroups(sizeof(groups)/sizeof(groups[0]), groups); 1781 1782 prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0); 1783 1784 setgid(AID_DHCP); 1785 setuid(AID_DHCP); 1786 header.version = _LINUX_CAPABILITY_VERSION; 1787 header.pid = 0; 1788 cap.effective = cap.permitted = 1789 (1 << CAP_NET_ADMIN) | (1 << CAP_NET_RAW) | 1790 (1 << CAP_NET_BROADCAST) | (1 << CAP_NET_BIND_SERVICE); 1791 cap.inheritable = 0; 1792 capset(&header, &cap); 1793 } 1794 #endif /* ANDROID */ 1795 1796 int 1797 main(int argc, char **argv) 1798 { 1799 struct interface *iface; 1800 int opt, oi = 0, signal_fd, sig = 0, i, control_fd; 1801 size_t len; 1802 pid_t pid; 1803 struct timespec ts; 1804 1805 #ifdef ANDROID 1806 /* Reuse system properties for a p2p interface */ 1807 char p2p_interface[PROPERTY_KEY_MAX]; 1808 switchUser(); 1809 #endif 1810 closefrom(3); 1811 openlog(PACKAGE, LOG_PERROR | LOG_PID, LOG_DAEMON); 1812 setlogmask(LOG_UPTO(LOG_INFO)); 1813 1814 /* Test for --help and --version */ 1815 if (argc > 1) { 1816 if (strcmp(argv[1], "--help") == 0) { 1817 usage(); 1818 exit(EXIT_SUCCESS); 1819 } else if (strcmp(argv[1], "--version") == 0) { 1820 printf(""PACKAGE" "VERSION"\n%s\n", copyright); 1821 exit(EXIT_SUCCESS); 1822 } 1823 } 1824 1825 i = 0; 1826 while ((opt = getopt_long(argc, argv, IF_OPTS, cf_options, &oi)) != -1) 1827 { 1828 switch (opt) { 1829 case 'f': 1830 cffile = optarg; 1831 break; 1832 case 'g': 1833 sig = SIGUSR1; 1834 break; 1835 case 'k': 1836 sig = SIGHUP; 1837 break; 1838 case 'n': 1839 sig = SIGALRM; 1840 break; 1841 case 'x': 1842 sig = SIGTERM; 1843 break; 1844 case 'T': 1845 i = 1; 1846 break; 1847 case 'U': 1848 i = 2; 1849 break; 1850 case 'a': 1851 avoid_routes = 1; 1852 break; 1853 case 'V': 1854 print_options(); 1855 exit(EXIT_SUCCESS); 1856 case '?': 1857 usage(); 1858 exit(EXIT_FAILURE); 1859 } 1860 } 1861 1862 margv = argv; 1863 margc = argc; 1864 if_options = read_config(cffile, NULL, NULL, NULL); 1865 opt = add_options(if_options, argc, argv); 1866 if (opt != 1) { 1867 if (opt == 0) 1868 usage(); 1869 exit(EXIT_FAILURE); 1870 } 1871 options = if_options->options; 1872 if (i != 0) { 1873 if (i == 1) 1874 options |= DHCPCD_TEST; 1875 else 1876 options |= DHCPCD_DUMPLEASE; 1877 options |= DHCPCD_PERSISTENT; 1878 options &= ~DHCPCD_DAEMONISE; 1879 } 1880 1881 #ifdef THERE_IS_NO_FORK 1882 options &= ~DHCPCD_DAEMONISE; 1883 #endif 1884 1885 if (options & DHCPCD_DEBUG) 1886 setlogmask(LOG_UPTO(LOG_DEBUG)); 1887 if (options & DHCPCD_QUIET) 1888 close(STDERR_FILENO); 1889 1890 if (!(options & (DHCPCD_TEST | DHCPCD_DUMPLEASE))) { 1891 /* If we have any other args, we should run as a single dhcpcd 1892 * instance for that interface. */ 1893 len = strlen(PIDFILE) + IF_NAMESIZE + 2; 1894 pidfile = xmalloc(len); 1895 if (optind == argc - 1) 1896 snprintf(pidfile, len, PIDFILE, "-", argv[optind]); 1897 else { 1898 snprintf(pidfile, len, PIDFILE, "", ""); 1899 options |= DHCPCD_MASTER; 1900 } 1901 } 1902 1903 if (chdir("/") == -1) 1904 syslog(LOG_ERR, "chdir `/': %m"); 1905 atexit(cleanup); 1906 1907 if (options & DHCPCD_DUMPLEASE) { 1908 if (optind != argc - 1) { 1909 syslog(LOG_ERR, "dumplease requires an interface"); 1910 exit(EXIT_FAILURE); 1911 } 1912 ifaces = iface = xzalloc(sizeof(*iface)); 1913 strlcpy(iface->name, argv[optind], sizeof(iface->name)); 1914 snprintf(iface->leasefile, sizeof(iface->leasefile), 1915 LEASEFILE, iface->name); 1916 iface->state = xzalloc(sizeof(*iface->state)); 1917 iface->state->options = xzalloc(sizeof(*iface->state->options)); 1918 strlcpy(iface->state->options->script, if_options->script, 1919 sizeof(iface->state->options->script)); 1920 iface->state->new = read_lease(iface); 1921 if (iface->state->new == NULL && errno == ENOENT) { 1922 strlcpy(iface->leasefile, argv[optind], 1923 sizeof(iface->leasefile)); 1924 iface->state->new = read_lease(iface); 1925 } 1926 if (iface->state->new == NULL) { 1927 if (errno == ENOENT) 1928 syslog(LOG_ERR, "%s: no lease to dump", 1929 iface->name); 1930 exit(EXIT_FAILURE); 1931 } 1932 iface->state->reason = "DUMP"; 1933 run_script(iface); 1934 exit(EXIT_SUCCESS); 1935 } 1936 1937 if (!(options & (DHCPCD_MASTER | DHCPCD_TEST))) { 1938 control_fd = open_control(); 1939 if (control_fd != -1) { 1940 syslog(LOG_INFO, 1941 "sending commands to master dhcpcd process"); 1942 i = send_control(argc, argv); 1943 if (i > 0) { 1944 syslog(LOG_DEBUG, "send OK"); 1945 exit(EXIT_SUCCESS); 1946 } else { 1947 syslog(LOG_ERR, "failed to send commands"); 1948 exit(EXIT_FAILURE); 1949 } 1950 } else { 1951 if (errno != ENOENT) 1952 syslog(LOG_ERR, "open_control: %m"); 1953 } 1954 } 1955 1956 #ifndef ANDROID 1957 /* android runs us as user "dhcp" */ 1958 if (geteuid()) 1959 syslog(LOG_WARNING, 1960 PACKAGE " will not work correctly unless run as root"); 1961 #endif 1962 if (sig != 0) { 1963 #ifdef ANDROID 1964 char pidpropname[PROPERTY_KEY_MAX]; 1965 char pidpropval[PROPERTY_VALUE_MAX]; 1966 1967 if (optind != argc - 1) { 1968 syslog(LOG_ERR, "Android requires an interface"); 1969 exit(EXIT_FAILURE); 1970 } 1971 1972 if (strncmp(argv[optind], "p2p", 3) == 0) { 1973 strncpy(p2p_interface, "p2p", sizeof(p2p_interface)); 1974 } else { 1975 strncpy(p2p_interface, argv[optind], sizeof(p2p_interface)); 1976 } 1977 1978 if (snprintf(pidpropname, 1979 sizeof(pidpropname), 1980 "dhcp.%s.pid", p2p_interface) >= PROPERTY_KEY_MAX) 1981 exit(EXIT_FAILURE); 1982 property_get(pidpropname, pidpropval, NULL); 1983 if (strlen(pidpropval) == 0) 1984 exit(EXIT_FAILURE); 1985 pid = atoi(pidpropval); 1986 #else 1987 pid = read_pid(); 1988 #endif 1989 if (pid != 0) 1990 syslog(LOG_INFO, "sending signal %d to pid %d", 1991 sig, pid); 1992 if (pid == 0 || kill(pid, sig) != 0) { 1993 if (sig != SIGALRM) 1994 syslog(LOG_ERR, ""PACKAGE" not running"); 1995 if (pid != 0 && errno != ESRCH) { 1996 syslog(LOG_ERR, "kill: %m"); 1997 exit(EXIT_FAILURE); 1998 } 1999 unlink(pidfile); 2000 if (sig != SIGALRM) 2001 exit(EXIT_FAILURE); 2002 } else { 2003 if (sig == SIGALRM || sig == SIGUSR1) 2004 exit(EXIT_SUCCESS); 2005 /* Spin until it exits */ 2006 syslog(LOG_INFO, "waiting for pid %d to exit", pid); 2007 ts.tv_sec = 0; 2008 ts.tv_nsec = 100000000; /* 10th of a second */ 2009 for(i = 0; i < 100; i++) { 2010 nanosleep(&ts, NULL); 2011 if (read_pid() == 0) 2012 exit(EXIT_SUCCESS); 2013 } 2014 syslog(LOG_ERR, "pid %d failed to exit", pid); 2015 exit(EXIT_FAILURE); 2016 } 2017 } 2018 2019 if (!(options & DHCPCD_TEST)) { 2020 #ifdef ANDROID 2021 char pidpropname[PROPERTY_KEY_MAX]; 2022 char pidpropval[PROPERTY_VALUE_MAX]; 2023 #endif 2024 #ifndef ANDROID 2025 if ((pid = read_pid()) > 0 && 2026 kill(pid, 0) == 0) 2027 { 2028 syslog(LOG_ERR, ""PACKAGE 2029 " already running on pid %d (%s)", 2030 pid, pidfile); 2031 exit(EXIT_FAILURE); 2032 } 2033 2034 /* Ensure we have the needed directories */ 2035 if (mkdir(RUNDIR, 0755) == -1 && errno != EEXIST) 2036 syslog(LOG_ERR, "mkdir `%s': %m", RUNDIR); 2037 if (mkdir(DBDIR, 0755) == -1 && errno != EEXIST) 2038 syslog(LOG_ERR, "mkdir `%s': %m", DBDIR); 2039 #endif 2040 2041 pidfd = open(pidfile, O_WRONLY | O_CREAT | O_NONBLOCK, 0664); 2042 if (pidfd == -1) 2043 syslog(LOG_ERR, "open `%s': %m", pidfile); 2044 else { 2045 /* Lock the file so that only one instance of dhcpcd 2046 * runs on an interface */ 2047 if (flock(pidfd, LOCK_EX | LOCK_NB) == -1) { 2048 syslog(LOG_ERR, "flock `%s': %m", pidfile); 2049 exit(EXIT_FAILURE); 2050 } 2051 if (set_cloexec(pidfd) == -1) 2052 exit(EXIT_FAILURE); 2053 #ifdef ANDROID 2054 if (optind != argc - 1) { 2055 syslog(LOG_ERR, "Android requires an interface"); 2056 exit(EXIT_FAILURE); 2057 } 2058 2059 if (strncmp(argv[optind], "p2p", 3) == 0) { 2060 strncpy(p2p_interface, "p2p", sizeof(p2p_interface)); 2061 } else { 2062 strncpy(p2p_interface, argv[optind], sizeof(p2p_interface)); 2063 } 2064 2065 if (snprintf(pidpropname, 2066 sizeof(pidpropname), 2067 "dhcp.%s.pid", p2p_interface) >= PROPERTY_KEY_MAX) 2068 exit(EXIT_FAILURE); 2069 if (snprintf(pidpropval, sizeof(pidpropval), "%d", getpid()) >= PROPERTY_VALUE_MAX) 2070 exit(EXIT_FAILURE); 2071 property_set(pidpropname, pidpropval); 2072 #else 2073 writepid(pidfd, getpid()); 2074 #endif 2075 } 2076 } 2077 2078 syslog(LOG_INFO, "version " VERSION " starting"); 2079 2080 if ((signal_fd = signal_init()) == -1) 2081 exit(EXIT_FAILURE); 2082 if (signal_setup() == -1) 2083 exit(EXIT_FAILURE); 2084 add_event(signal_fd, handle_signal, NULL); 2085 2086 if (options & DHCPCD_MASTER) { 2087 if (start_control() == -1) 2088 syslog(LOG_ERR, "start_control: %m"); 2089 } 2090 2091 if (init_sockets() == -1) { 2092 syslog(LOG_ERR, "init_socket: %m"); 2093 exit(EXIT_FAILURE); 2094 } 2095 if (if_options->options & DHCPCD_LINK) { 2096 linkfd = open_link_socket(); 2097 if (linkfd == -1) 2098 syslog(LOG_ERR, "open_link_socket: %m"); 2099 else 2100 add_event(linkfd, handle_link, NULL); 2101 } 2102 2103 #if 0 2104 if (options & DHCPCD_IPV6RS && disable_rtadv() == -1) { 2105 syslog(LOG_ERR, "ipv6rs: %m"); 2106 options &= ~DHCPCD_IPV6RS; 2107 } 2108 #endif 2109 2110 if (options & DHCPCD_IPV6RS && !check_ipv6(NULL)) 2111 options &= ~DHCPCD_IPV6RS; 2112 if (options & DHCPCD_IPV6RS) { 2113 ipv6rsfd = ipv6rs_open(); 2114 if (ipv6rsfd == -1) { 2115 syslog(LOG_ERR, "ipv6rs: %m"); 2116 options &= ~DHCPCD_IPV6RS; 2117 } else { 2118 add_event(ipv6rsfd, ipv6rs_handledata, NULL); 2119 // atexit(restore_rtadv); 2120 } 2121 } 2122 2123 ifc = argc - optind; 2124 ifv = argv + optind; 2125 2126 /* When running dhcpcd against a single interface, we need to retain 2127 * the old behaviour of waiting for an IP address */ 2128 if (ifc == 1) 2129 options |= DHCPCD_WAITIP; 2130 2131 ifaces = discover_interfaces(ifc, ifv); 2132 for (i = 0; i < ifc; i++) { 2133 for (iface = ifaces; iface; iface = iface->next) 2134 if (strcmp(iface->name, ifv[i]) == 0) 2135 break; 2136 if (!iface) 2137 syslog(LOG_ERR, "%s: interface not found or invalid", 2138 ifv[i]); 2139 } 2140 if (!ifaces) { 2141 if (ifc == 0) 2142 syslog(LOG_ERR, "no valid interfaces found"); 2143 else 2144 exit(EXIT_FAILURE); 2145 if (!(options & DHCPCD_LINK)) { 2146 syslog(LOG_ERR, 2147 "aborting as link detection is disabled"); 2148 exit(EXIT_FAILURE); 2149 } 2150 } 2151 2152 if (options & DHCPCD_BACKGROUND) 2153 daemonise(); 2154 2155 opt = 0; 2156 for (iface = ifaces; iface; iface = iface->next) { 2157 init_state(iface, argc, argv); 2158 if (iface->carrier != LINK_DOWN) 2159 opt = 1; 2160 } 2161 2162 if (!(options & DHCPCD_BACKGROUND)) { 2163 /* If we don't have a carrier, we may have to wait for a second 2164 * before one becomes available if we brought an interface up */ 2165 if (opt == 0 && 2166 options & DHCPCD_LINK && 2167 options & DHCPCD_WAITUP && 2168 !(options & DHCPCD_WAITIP)) 2169 { 2170 ts.tv_sec = 1; 2171 ts.tv_nsec = 0; 2172 nanosleep(&ts, NULL); 2173 for (iface = ifaces; iface; iface = iface->next) { 2174 handle_carrier(0, 0, iface->name); 2175 if (iface->carrier != LINK_DOWN) { 2176 opt = 1; 2177 break; 2178 } 2179 } 2180 } 2181 if (options & DHCPCD_MASTER) 2182 i = if_options->timeout; 2183 else 2184 i = ifaces->state->options->timeout; 2185 if (opt == 0 && 2186 options & DHCPCD_LINK && 2187 !(options & DHCPCD_WAITIP)) 2188 { 2189 syslog(LOG_WARNING, "no interfaces have a carrier"); 2190 daemonise(); 2191 } else if (i > 0) { 2192 if (options & DHCPCD_IPV4LL) 2193 options |= DHCPCD_TIMEOUT_IPV4LL; 2194 add_timeout_sec(i, handle_exit_timeout, NULL); 2195 } 2196 } 2197 free_options(if_options); 2198 if_options = NULL; 2199 2200 sort_interfaces(); 2201 for (iface = ifaces; iface; iface = iface->next) 2202 add_timeout_sec(0, start_interface, iface); 2203 2204 start_eloop(); 2205 exit(EXIT_SUCCESS); 2206 } 2207
