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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 | /* vi: set sw=4 ts=4: */ /* * ifplugd for busybox, based on ifplugd 0.28 (written by Lennart Poettering). * * Copyright (C) 2009 Maksym Kryzhanovskyy <xmaks@email.cz> * * Licensed under GPLv2 or later, see file LICENSE in this source tree. */ //config:config IFPLUGD //config: bool "ifplugd (10 kb)" //config: default y //config: help //config: Network interface plug detection daemon. //applet:IF_IFPLUGD(APPLET(ifplugd, BB_DIR_USR_SBIN, BB_SUID_DROP)) //kbuild:lib-$(CONFIG_IFPLUGD) += ifplugd.o //usage:#define ifplugd_trivial_usage //usage: "[OPTIONS]" //usage:#define ifplugd_full_usage "\n\n" //usage: "Network interface plug detection daemon\n" //usage: "\n -n Run in foreground" //usage: "\n -s Don't log to syslog" //usage: "\n -i IFACE Interface" //usage: "\n -f/-F Treat link detection error as link down/link up" //usage: "\n (otherwise exit on error)" //usage: "\n -a Don't up interface at each link probe" //usage: "\n -M Monitor creation/destruction of interface" //usage: "\n (otherwise it must exist)" //usage: "\n -A Don't up newly appeared interface" //usage: "\n -r PROG Script to run" //usage: "\n -x ARG Extra argument for script" //usage: "\n -I Don't exit on nonzero exit code from script" //usage: "\n -p Don't run \"up\" script on startup" //usage: "\n -q Don't run \"down\" script on exit" //usage: "\n -l Always run script on startup" //usage: "\n -t SECS Poll time in seconds" //usage: "\n -u SECS Delay before running script after link up" //usage: "\n -d SECS Delay after link down" //usage: "\n -m MODE API mode (mii, priv, ethtool, wlan, iff, auto)" //usage: "\n -k Kill running daemon" #include "libbb.h" #include "fix_u32.h" #include <linux/if.h> #include <linux/mii.h> #include <linux/ethtool.h> #ifdef HAVE_NET_ETHERNET_H /* musl breakage: * In file included from /usr/include/net/ethernet.h:10, * from networking/ifplugd.c:41: * /usr/include/netinet/if_ether.h:96: error: redefinition of 'struct ethhdr' * * Build succeeds without it on musl. Commented it out. * If on your system you need it, consider removing <linux/ethtool.h> * and copy-pasting its definitions here (<linux/ethtool.h> is what pulls in * conflicting definition of struct ethhdr on musl). */ /* # include <net/ethernet.h> */ #endif #include <linux/netlink.h> #include <linux/rtnetlink.h> #include <linux/sockios.h> #include <syslog.h> #define __user #include <linux/wireless.h> #ifndef ETH_ALEN # define ETH_ALEN 6 #endif /* From initial port to busybox, removed most of the redundancy by converting implementation of a polymorphic interface to the strict functional style. The main role is run a script when link state changed, other activities like audio signal or detailed reports are on the script itself. One questionable point of the design is netlink usage: We have 1 second timeout by default to poll the link status, it is short enough so that there are no real benefits in using netlink to get "instantaneous" interface creation/deletion notifications. We can check for interface existence by just doing some fast ioctl using its name. Netlink code then can be just dropped (1k or more?) */ #define IFPLUGD_ENV_PREVIOUS "IFPLUGD_PREVIOUS" #define IFPLUGD_ENV_CURRENT "IFPLUGD_CURRENT" enum { FLAG_NO_AUTO = 1 << 0, // -a, Don't up interface at each link probe FLAG_NO_DAEMON = 1 << 1, // -n, Do not daemonize FLAG_NO_SYSLOG = 1 << 2, // -s, Do not use syslog, use stderr instead FLAG_IGNORE_FAIL = 1 << 3, // -f, Ignore detection failure, retry instead (failure is treated as DOWN) FLAG_IGNORE_FAIL_POSITIVE = 1 << 4, // -F, Ignore detection failure, retry instead (failure is treated as UP) FLAG_IFACE = 1 << 5, // -i, Specify ethernet interface FLAG_RUN = 1 << 6, // -r, Specify program to execute FLAG_IGNORE_RETVAL = 1 << 7, // -I, Don't exit on nonzero return value of program executed FLAG_POLL_TIME = 1 << 8, // -t, Specify poll time in seconds FLAG_DELAY_UP = 1 << 9, // -u, Specify delay for configuring interface FLAG_DELAY_DOWN = 1 << 10, // -d, Specify delay for deconfiguring interface FLAG_API_MODE = 1 << 11, // -m, Force API mode (mii, priv, ethtool, wlan, auto) FLAG_NO_STARTUP = 1 << 12, // -p, Don't run script on daemon startup FLAG_NO_SHUTDOWN = 1 << 13, // -q, Don't run script on daemon quit FLAG_INITIAL_DOWN = 1 << 14, // -l, Run "down" script on startup if no cable is detected FLAG_EXTRA_ARG = 1 << 15, // -x, Specify an extra argument for action script FLAG_MONITOR = 1 << 16, // -M, Use interface monitoring FLAG_NO_UP_NEW_IFACE = 1 << 17, // -A, Don't up newly appeared interface #if ENABLE_FEATURE_PIDFILE FLAG_KILL = 1 << 18, // -k, Kill a running daemon #endif }; #if ENABLE_FEATURE_PIDFILE # define OPTION_STR "+ansfFi:r:It:+u:+d:+m:pqlx:MAk" #else # define OPTION_STR "+ansfFi:r:It:+u:+d:+m:pqlx:MA" #endif enum { // interface status IFSTATUS_ERR = -1, IFSTATUS_DOWN = 0, IFSTATUS_UP = 1, }; enum { // constant fds ioctl_fd = 3, netlink_fd = 4, }; struct globals { smallint iface_last_status; smallint iface_prev_status; smallint iface_exists; smallint api_method_num; /* Used in getopt32, must have sizeof == sizeof(int) */ unsigned poll_time; unsigned delay_up; unsigned delay_down; const char *iface; const char *api_mode; const char *script_name; const char *extra_arg; }; #define G (*ptr_to_globals) #define INIT_G() do { \ SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \ G.iface_last_status = -1; \ G.iface_exists = 1; \ G.poll_time = 1; \ G.delay_down = 5; \ G.iface = "eth0"; \ G.api_mode = "a"; \ G.script_name = "/etc/ifplugd/ifplugd.action"; \ } while (0) /* Utility routines */ static void set_ifreq_to_ifname(struct ifreq *ifreq) { memset(ifreq, 0, sizeof(struct ifreq)); strncpy_IFNAMSIZ(ifreq->ifr_name, G.iface); } static int network_ioctl(int request, void* data, const char *errmsg) { int r = ioctl(ioctl_fd, request, data); if (r < 0 && errmsg) bb_perror_msg("%s failed", errmsg); return r; } /* Link detection routines and table */ static smallint detect_link_mii(void) { /* char buffer instead of bona-fide struct avoids aliasing warning */ char buf[sizeof(struct ifreq)]; struct ifreq *const ifreq = (void *)buf; struct mii_ioctl_data *mii = (void *)&ifreq->ifr_data; set_ifreq_to_ifname(ifreq); if (network_ioctl(SIOCGMIIPHY, ifreq, "SIOCGMIIPHY") < 0) { return IFSTATUS_ERR; } mii->reg_num = 1; if (network_ioctl(SIOCGMIIREG, ifreq, "SIOCGMIIREG") < 0) { return IFSTATUS_ERR; } return (mii->val_out & 0x0004) ? IFSTATUS_UP : IFSTATUS_DOWN; } static smallint detect_link_priv(void) { /* char buffer instead of bona-fide struct avoids aliasing warning */ char buf[sizeof(struct ifreq)]; struct ifreq *const ifreq = (void *)buf; struct mii_ioctl_data *mii = (void *)&ifreq->ifr_data; set_ifreq_to_ifname(ifreq); if (network_ioctl(SIOCDEVPRIVATE, ifreq, "SIOCDEVPRIVATE") < 0) { return IFSTATUS_ERR; } mii->reg_num = 1; if (network_ioctl(SIOCDEVPRIVATE+1, ifreq, "SIOCDEVPRIVATE+1") < 0) { return IFSTATUS_ERR; } return (mii->val_out & 0x0004) ? IFSTATUS_UP : IFSTATUS_DOWN; } static smallint detect_link_ethtool(void) { struct ifreq ifreq; struct ethtool_value edata; set_ifreq_to_ifname(&ifreq); edata.cmd = ETHTOOL_GLINK; ifreq.ifr_data = (void*) &edata; if (network_ioctl(SIOCETHTOOL, &ifreq, "ETHTOOL_GLINK") < 0) { return IFSTATUS_ERR; } return edata.data ? IFSTATUS_UP : IFSTATUS_DOWN; } static smallint detect_link_iff(void) { struct ifreq ifreq; set_ifreq_to_ifname(&ifreq); if (network_ioctl(SIOCGIFFLAGS, &ifreq, "SIOCGIFFLAGS") < 0) { return IFSTATUS_ERR; } /* If IFF_UP is not set (interface is down), IFF_RUNNING is never set * regardless of link status. Simply continue to report last status - * no point in reporting spurious link downs if interface is disabled * by admin. When/if it will be brought up, * we'll report real link status. */ if (!(ifreq.ifr_flags & IFF_UP) && G.iface_last_status != IFSTATUS_ERR) return G.iface_last_status; return (ifreq.ifr_flags & IFF_RUNNING) ? IFSTATUS_UP : IFSTATUS_DOWN; } static smallint detect_link_wlan(void) { int i; struct iwreq iwrequest; uint8_t mac[ETH_ALEN]; memset(&iwrequest, 0, sizeof(iwrequest)); strncpy_IFNAMSIZ(iwrequest.ifr_ifrn.ifrn_name, G.iface); if (network_ioctl(SIOCGIWAP, &iwrequest, "SIOCGIWAP") < 0) { return IFSTATUS_ERR; } memcpy(mac, &iwrequest.u.ap_addr.sa_data, ETH_ALEN); if (mac[0] == 0xFF || mac[0] == 0x44 || mac[0] == 0x00) { for (i = 1; i < ETH_ALEN; ++i) { if (mac[i] != mac[0]) return IFSTATUS_UP; } return IFSTATUS_DOWN; } return IFSTATUS_UP; } enum { // api mode API_ETHTOOL, // 'e' API_MII, // 'm' API_PRIVATE, // 'p' API_WLAN, // 'w' API_IFF, // 'i' API_AUTO, // 'a' }; static const char api_modes[] ALIGN1 = "empwia"; static const struct { const char *name; smallint (*func)(void); } method_table[] ALIGN_PTR = { { "SIOCETHTOOL" , &detect_link_ethtool }, { "SIOCGMIIPHY" , &detect_link_mii }, { "SIOCDEVPRIVATE" , &detect_link_priv }, { "wireless extension", &detect_link_wlan }, { "IFF_RUNNING" , &detect_link_iff }, }; static const char *strstatus(int status) { if (status == IFSTATUS_ERR) return "error"; return "down\0up" + (status * 5); } static int run_script(const char *action) { char *env_PREVIOUS, *env_CURRENT; char *argv[5]; int r; bb_info_msg("executing '%s %s %s'", G.script_name, G.iface, action); argv[0] = (char*) G.script_name; argv[1] = (char*) G.iface; argv[2] = (char*) action; argv[3] = (char*) G.extra_arg; argv[4] = NULL; env_PREVIOUS = xasprintf("%s=%s", IFPLUGD_ENV_PREVIOUS, strstatus(G.iface_prev_status)); putenv(env_PREVIOUS); env_CURRENT = xasprintf("%s=%s", IFPLUGD_ENV_CURRENT, strstatus(G.iface_last_status)); putenv(env_CURRENT); /* r < 0 - can't exec, 0 <= r < 0x180 - exited, >=0x180 - killed by sig (r-0x180) */ r = spawn_and_wait(argv); bb_unsetenv_and_free(env_PREVIOUS); bb_unsetenv_and_free(env_CURRENT); bb_info_msg("exit code: %d", r & 0xff); return (option_mask32 & FLAG_IGNORE_RETVAL) ? 0 : r; } static void up_iface(void) { struct ifreq ifrequest; if (!G.iface_exists) return; set_ifreq_to_ifname(&ifrequest); if (network_ioctl(SIOCGIFFLAGS, &ifrequest, "getting interface flags") < 0) { G.iface_exists = 0; return; } if (!(ifrequest.ifr_flags & IFF_UP)) { ifrequest.ifr_flags |= IFF_UP; /* Let user know we mess up with interface */ bb_simple_info_msg("upping interface"); if (network_ioctl(SIOCSIFFLAGS, &ifrequest, "setting interface flags") < 0) { if (errno != ENODEV && errno != EADDRNOTAVAIL) xfunc_die(); G.iface_exists = 0; return; } } #if 0 /* why do we mess with IP addr? It's not our business */ if (network_ioctl(SIOCGIFADDR, &ifrequest, "can't get interface address") < 0) { } else if (ifrequest.ifr_addr.sa_family != AF_INET) { bb_perror_msg("the interface is not IP-based"); } else { ((struct sockaddr_in*)(&ifrequest.ifr_addr))->sin_addr.s_addr = INADDR_ANY; network_ioctl(SIOCSIFADDR, &ifrequest, "can't set interface address"); } network_ioctl(SIOCGIFFLAGS, &ifrequest, "can't get interface flags"); #endif } static void maybe_up_new_iface(void) { if (!(option_mask32 & FLAG_NO_UP_NEW_IFACE)) up_iface(); #if 0 /* bloat */ struct ifreq ifrequest; struct ethtool_drvinfo driver_info; set_ifreq_to_ifname(&ifrequest); driver_info.cmd = ETHTOOL_GDRVINFO; ifrequest.ifr_data = &driver_info; if (network_ioctl(SIOCETHTOOL, &ifrequest, NULL) == 0) { char buf[sizeof("/xx:xx:xx:xx:xx:xx")]; /* Get MAC */ buf[0] = '\0'; set_ifreq_to_ifname(&ifrequest); if (network_ioctl(SIOCGIFHWADDR, &ifrequest, NULL) == 0) { sprintf(buf, "/%02X:%02X:%02X:%02X:%02X:%02X", (uint8_t)(ifrequest.ifr_hwaddr.sa_data[0]), (uint8_t)(ifrequest.ifr_hwaddr.sa_data[1]), (uint8_t)(ifrequest.ifr_hwaddr.sa_data[2]), (uint8_t)(ifrequest.ifr_hwaddr.sa_data[3]), (uint8_t)(ifrequest.ifr_hwaddr.sa_data[4]), (uint8_t)(ifrequest.ifr_hwaddr.sa_data[5])); } bb_info_msg("using interface %s%s with driver<%s> (version: %s)", G.iface, buf, driver_info.driver, driver_info.version); } #endif if (G.api_mode[0] == 'a') G.api_method_num = API_AUTO; } static smallint detect_link(void) { smallint status; if (!G.iface_exists) return (option_mask32 & FLAG_MONITOR) ? IFSTATUS_DOWN : IFSTATUS_ERR; /* Some drivers can't detect link status when the interface is down. * I imagine detect_link_iff() is the most vulnerable. * That's why -a "noauto" in an option, not a hardwired behavior. */ if (!(option_mask32 & FLAG_NO_AUTO)) up_iface(); if (G.api_method_num == API_AUTO) { int i; smallint sv_logmode; sv_logmode = logmode; for (i = 0; i < ARRAY_SIZE(method_table); i++) { logmode = LOGMODE_NONE; status = method_table[i].func(); logmode = sv_logmode; if (status != IFSTATUS_ERR) { G.api_method_num = i; bb_info_msg("using %s detection mode", method_table[i].name); break; } } } else { status = method_table[G.api_method_num].func(); } if (status == IFSTATUS_ERR) { if (option_mask32 & FLAG_IGNORE_FAIL) status = IFSTATUS_DOWN; else if (option_mask32 & FLAG_IGNORE_FAIL_POSITIVE) status = IFSTATUS_UP; else if (G.api_mode[0] == 'a') bb_simple_error_msg("can't detect link status"); } if (status != G.iface_last_status) { G.iface_prev_status = G.iface_last_status; G.iface_last_status = status; } return status; } static NOINLINE int check_existence_through_netlink(void) { int iface_len; /* Buffer was 1K, but on linux-3.9.9 it was reported to be too small. * netlink.h: "limit to 8K to avoid MSG_TRUNC when PAGE_SIZE is very large". * Note: on error returns (-1) we exit, no need to free replybuf. */ enum { BUF_SIZE = 8 * 1024 }; char *replybuf = xmalloc(BUF_SIZE); iface_len = strlen(G.iface); while (1) { struct nlmsghdr *mhdr; ssize_t bytes; bytes = recv(netlink_fd, replybuf, BUF_SIZE, MSG_DONTWAIT); if (bytes < 0) { if (errno == EAGAIN) goto ret; if (errno == EINTR) continue; bb_simple_perror_msg("netlink: recv"); return -1; } mhdr = (struct nlmsghdr*)replybuf; while (bytes > 0) { if (!NLMSG_OK(mhdr, bytes)) { bb_simple_error_msg("netlink packet too small or truncated"); return -1; } if (mhdr->nlmsg_type == RTM_NEWLINK || mhdr->nlmsg_type == RTM_DELLINK) { struct rtattr *attr; int attr_len; if (mhdr->nlmsg_len < NLMSG_LENGTH(sizeof(struct ifinfomsg))) { bb_simple_error_msg("netlink packet too small or truncated"); return -1; } attr = IFLA_RTA(NLMSG_DATA(mhdr)); attr_len = IFLA_PAYLOAD(mhdr); while (RTA_OK(attr, attr_len)) { if (attr->rta_type == IFLA_IFNAME) { int len = RTA_PAYLOAD(attr); if (len > IFNAMSIZ) len = IFNAMSIZ; if (iface_len <= len && strncmp(G.iface, RTA_DATA(attr), len) == 0 ) { G.iface_exists = (mhdr->nlmsg_type == RTM_NEWLINK); } } attr = RTA_NEXT(attr, attr_len); } } mhdr = NLMSG_NEXT(mhdr, bytes); } } ret: free(replybuf); return G.iface_exists; } #if ENABLE_FEATURE_PIDFILE static NOINLINE pid_t read_pid(const char *filename) { int len; char buf[128]; len = open_read_close(filename, buf, 127); if (len > 0) { buf[len] = '\0'; /* returns ULONG_MAX on error => -1 */ return bb_strtoul(buf, NULL, 10); } return 0; } #endif int ifplugd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; int ifplugd_main(int argc UNUSED_PARAM, char **argv) { int iface_status; int delay_time; const char *iface_status_str; struct pollfd netlink_pollfd[1]; unsigned opts; const char *api_mode_found; #if ENABLE_FEATURE_PIDFILE char *pidfile_name; pid_t pid_from_pidfile; #endif INIT_G(); opts = getopt32(argv, OPTION_STR, &G.iface, &G.script_name, &G.poll_time, &G.delay_up, &G.delay_down, &G.api_mode, &G.extra_arg); G.poll_time *= 1000; applet_name = xasprintf("ifplugd(%s)", G.iface); #if ENABLE_FEATURE_PIDFILE pidfile_name = xasprintf(CONFIG_PID_FILE_PATH "/ifplugd.%s.pid", G.iface); pid_from_pidfile = read_pid(pidfile_name); if (opts & FLAG_KILL) { if (pid_from_pidfile > 0) /* Upstream tool use SIGINT for -k */ kill(pid_from_pidfile, SIGINT); return EXIT_SUCCESS; } if (pid_from_pidfile > 0 && kill(pid_from_pidfile, 0) == 0) bb_simple_error_msg_and_die("daemon already running"); #endif api_mode_found = strchr(api_modes, G.api_mode[0]); if (!api_mode_found) bb_error_msg_and_die("unknown API mode '%s'", G.api_mode); G.api_method_num = api_mode_found - api_modes; if (!(opts & FLAG_NO_DAEMON)) bb_daemonize_or_rexec(DAEMON_CHDIR_ROOT, argv); xmove_fd(xsocket(AF_INET, SOCK_DGRAM, 0), ioctl_fd); if (opts & FLAG_MONITOR) { int fd = create_and_bind_to_netlink(NETLINK_ROUTE, RTMGRP_LINK, 0); xmove_fd(fd, netlink_fd); } write_pidfile(pidfile_name); /* this can't be moved before socket creation */ if (!(opts & FLAG_NO_SYSLOG)) { openlog(applet_name, 0, LOG_DAEMON); logmode |= LOGMODE_SYSLOG; } bb_signals(0 | (1 << SIGINT ) | (1 << SIGTERM) | (1 << SIGQUIT) | (1 << SIGHUP ) /* why we ignore it? */ /* | (1 << SIGCHLD) - run_script does not use it anymore */ , record_signo); bb_info_msg("started: %s", bb_banner); if (opts & FLAG_MONITOR) { struct ifreq ifrequest; set_ifreq_to_ifname(&ifrequest); G.iface_exists = (network_ioctl(SIOCGIFINDEX, &ifrequest, NULL) == 0); } if (G.iface_exists) maybe_up_new_iface(); iface_status = detect_link(); if (iface_status == IFSTATUS_ERR) goto exiting; iface_status_str = strstatus(iface_status); if (opts & FLAG_MONITOR) { bb_info_msg("interface %s", G.iface_exists ? "exists" : "doesn't exist, waiting"); } /* else we assume it always exists, but don't mislead user * by potentially lying that it really exists */ if (G.iface_exists) { bb_info_msg("link is %s", iface_status_str); } if ((!(opts & FLAG_NO_STARTUP) && iface_status == IFSTATUS_UP ) || (opts & FLAG_INITIAL_DOWN) ) { if (run_script(iface_status_str) != 0) goto exiting; } /* Main loop */ netlink_pollfd[0].fd = netlink_fd; netlink_pollfd[0].events = POLLIN; delay_time = 0; while (1) { int iface_status_old; switch (bb_got_signal) { case SIGINT: case SIGTERM: bb_got_signal = 0; goto cleanup; case SIGQUIT: bb_got_signal = 0; goto exiting; default: bb_got_signal = 0; /* do not clear bb_got_signal if already 0, this can lose signals */ case 0: break; } if (poll(netlink_pollfd, (opts & FLAG_MONITOR) ? 1 : 0, G.poll_time ) < 0 ) { if (errno == EINTR) continue; bb_simple_perror_msg("poll"); goto exiting; } if ((opts & FLAG_MONITOR) && (netlink_pollfd[0].revents & POLLIN) ) { int iface_exists_old; iface_exists_old = G.iface_exists; G.iface_exists = check_existence_through_netlink(); if (G.iface_exists < 0) /* error */ goto exiting; if (iface_exists_old != G.iface_exists) { bb_info_msg("interface %sappeared", G.iface_exists ? "" : "dis"); if (G.iface_exists) maybe_up_new_iface(); } } /* note: if !G.iface_exists, returns DOWN */ iface_status_old = iface_status; iface_status = detect_link(); if (iface_status == IFSTATUS_ERR) { if (!(opts & FLAG_MONITOR)) goto exiting; iface_status = IFSTATUS_DOWN; } iface_status_str = strstatus(iface_status); if (iface_status_old != iface_status) { bb_info_msg("link is %s", iface_status_str); if (delay_time) { /* link restored its old status before * we ran script. don't run the script: */ delay_time = 0; } else { delay_time = monotonic_sec(); if (iface_status == IFSTATUS_UP) delay_time += G.delay_up; if (iface_status == IFSTATUS_DOWN) delay_time += G.delay_down; #if 0 /* if you are back in 1970... */ if (delay_time == 0) { sleep1(); delay_time = 1; } #endif } } if (delay_time && (int)(monotonic_sec() - delay_time) >= 0) { if (run_script(iface_status_str) != 0) goto exiting; delay_time = 0; } } /* while (1) */ cleanup: if (!(opts & FLAG_NO_SHUTDOWN) && (iface_status == IFSTATUS_UP || (iface_status == IFSTATUS_DOWN && delay_time) ) ) { setenv(IFPLUGD_ENV_PREVIOUS, strstatus(iface_status), 1); setenv(IFPLUGD_ENV_CURRENT, strstatus(-1), 1); run_script("down\0up"); /* reusing string */ } exiting: remove_pidfile(pidfile_name); bb_simple_error_msg_and_die("exiting"); } |