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ifwatchd.c revision 1.27.2.1
      1  1.27.2.1  pgoyette /*	$NetBSD: ifwatchd.c,v 1.27.2.1 2016/11/04 14:49:26 pgoyette Exp $	*/
      2  1.27.2.1  pgoyette #include <sys/cdefs.h>
      3  1.27.2.1  pgoyette __RCSID("$NetBSD: ifwatchd.c,v 1.27.2.1 2016/11/04 14:49:26 pgoyette Exp $");
      4       1.2    martin 
      5       1.6    martin /*-
      6      1.14    martin  * Copyright (c) 2002, 2003 The NetBSD Foundation, Inc.
      7       1.1    martin  * All rights reserved.
      8       1.1    martin  *
      9       1.6    martin  * This code is derived from software contributed to The NetBSD Foundation
     10      1.17     grant  * by Martin Husemann <martin (at) NetBSD.org>.
     11       1.6    martin  *
     12       1.1    martin  * Redistribution and use in source and binary forms, with or without
     13       1.1    martin  * modification, are permitted provided that the following conditions
     14       1.1    martin  * are met:
     15       1.1    martin  * 1. Redistributions of source code must retain the above copyright
     16       1.1    martin  *    notice, this list of conditions and the following disclaimer.
     17       1.6    martin  * 2. Redistributions in binary form must reproduce the above copyright
     18       1.6    martin  *    notice, this list of conditions and the following disclaimer in the
     19       1.6    martin  *    documentation and/or other materials provided with the distribution.
     20       1.1    martin  *
     21       1.6    martin  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     22       1.6    martin  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     23       1.6    martin  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     24       1.6    martin  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     25       1.6    martin  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     26       1.6    martin  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     27       1.6    martin  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     28       1.6    martin  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     29       1.6    martin  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     30       1.6    martin  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     31       1.6    martin  * POSSIBILITY OF SUCH DAMAGE.
     32       1.1    martin  */
     33       1.1    martin 
     34       1.1    martin #include <sys/types.h>
     35       1.1    martin #include <sys/param.h>
     36       1.3    martin #include <sys/ioctl.h>
     37       1.1    martin #include <sys/socket.h>
     38       1.2    martin #include <sys/queue.h>
     39       1.9      tron #include <sys/wait.h>
     40       1.1    martin #include <net/if.h>
     41       1.1    martin #include <net/if_dl.h>
     42      1.20    martin #include <net/if_media.h>
     43       1.1    martin #include <net/route.h>
     44       1.2    martin #include <netinet/in.h>
     45  1.27.2.1  pgoyette #include <netinet/in_var.h>
     46       1.2    martin #include <arpa/inet.h>
     47       1.1    martin 
     48       1.7      tron #include <paths.h>
     49       1.1    martin #include <stdio.h>
     50       1.1    martin #include <stdlib.h>
     51       1.1    martin #include <string.h>
     52       1.1    martin #include <unistd.h>
     53       1.1    martin #include <netdb.h>
     54       1.3    martin #include <err.h>
     55       1.3    martin #include <ifaddrs.h>
     56      1.14    martin #include <syslog.h>
     57       1.1    martin 
     58      1.19    martin enum event { ARRIVAL, DEPARTURE, UP, DOWN, CARRIER, NO_CARRIER };
     59  1.27.2.1  pgoyette enum addrflag { NOTREADY, DETACHED, READY };
     60      1.19    martin 
     61       1.1    martin /* local functions */
     62      1.26     joerg __dead static void usage(void);
     63  1.27.2.1  pgoyette static void dispatch(const void *, size_t);
     64  1.27.2.1  pgoyette static enum addrflag check_addrflags(int af, int addrflags);
     65  1.27.2.1  pgoyette static void check_addrs(const struct ifa_msghdr *ifam);
     66  1.27.2.1  pgoyette static void invoke_script(const char *ifname, enum event ev,
     67  1.27.2.1  pgoyette     const struct sockaddr *sa, const struct sockaddr *dst);
     68       1.1    martin static void list_interfaces(const char *ifnames);
     69  1.27.2.1  pgoyette static void check_announce(const struct if_announcemsghdr *ifan);
     70  1.27.2.1  pgoyette static void check_carrier(const struct if_msghdr *ifm);
     71       1.1    martin static void free_interfaces(void);
     72  1.27.2.1  pgoyette static struct interface_data * find_interface(int index);
     73       1.3    martin static void run_initial_ups(void);
     74       1.1    martin 
     75       1.1    martin /* global variables */
     76      1.14    martin static int verbose = 0, quiet = 0;
     77       1.3    martin static int inhibit_initial = 0;
     78      1.10    martin static const char *arrival_script = NULL;
     79      1.10    martin static const char *departure_script = NULL;
     80       1.1    martin static const char *up_script = NULL;
     81       1.1    martin static const char *down_script = NULL;
     82      1.19    martin static const char *carrier_script = NULL;
     83      1.19    martin static const char *no_carrier_script = NULL;
     84      1.19    martin static const char DummyTTY[] = _PATH_DEVNULL;
     85      1.19    martin static const char DummySpeed[] = "9600";
     86      1.10    martin static const char **scripts[] = {
     87      1.10    martin 	&arrival_script,
     88      1.10    martin 	&departure_script,
     89      1.10    martin 	&up_script,
     90      1.19    martin 	&down_script,
     91      1.19    martin 	&carrier_script,
     92      1.19    martin 	&no_carrier_script
     93      1.13    itojun };
     94       1.1    martin 
     95       1.1    martin struct interface_data {
     96       1.1    martin 	SLIST_ENTRY(interface_data) next;
     97       1.1    martin 	int index;
     98      1.19    martin 	int last_carrier_status;
     99       1.1    martin 	char * ifname;
    100       1.1    martin };
    101      1.26     joerg static SLIST_HEAD(,interface_data) ifs = SLIST_HEAD_INITIALIZER(ifs);
    102       1.1    martin 
    103       1.1    martin int
    104       1.1    martin main(int argc, char **argv)
    105       1.1    martin {
    106       1.1    martin 	int c, s, n;
    107       1.1    martin 	int errs = 0;
    108  1.27.2.1  pgoyette 	struct msghdr msg;
    109  1.27.2.1  pgoyette 	struct iovec iov[1];
    110  1.27.2.1  pgoyette 	char buf[2048];
    111       1.1    martin 
    112      1.14    martin 	openlog(argv[0], LOG_PID|LOG_CONS, LOG_DAEMON);
    113      1.21    dyoung 	while ((c = getopt(argc, argv, "qvhic:n:u:d:A:D:")) != -1) {
    114       1.1    martin 		switch (c) {
    115       1.1    martin 		case 'h':
    116       1.1    martin 			usage();
    117       1.1    martin 			return 0;
    118      1.19    martin 
    119       1.3    martin 		case 'i':
    120       1.3    martin 			inhibit_initial = 1;
    121       1.3    martin 			break;
    122      1.19    martin 
    123       1.1    martin 		case 'v':
    124       1.1    martin 			verbose++;
    125       1.1    martin 			break;
    126      1.19    martin 
    127      1.14    martin 		case 'q':
    128      1.14    martin 			quiet = 1;
    129      1.14    martin 			break;
    130       1.1    martin 
    131      1.19    martin 		case 'c':
    132      1.19    martin 			carrier_script = optarg;
    133      1.19    martin 			break;
    134      1.19    martin 
    135      1.19    martin 		case 'n':
    136      1.19    martin 			no_carrier_script = optarg;
    137      1.19    martin 			break;
    138      1.19    martin 
    139       1.1    martin 		case 'u':
    140       1.1    martin 			up_script = optarg;
    141       1.1    martin 			break;
    142       1.1    martin 
    143       1.1    martin 		case 'd':
    144       1.1    martin 			down_script = optarg;
    145       1.1    martin 			break;
    146       1.1    martin 
    147      1.10    martin 		case 'A':
    148      1.10    martin 			arrival_script = optarg;
    149      1.10    martin 			break;
    150      1.10    martin 
    151      1.10    martin 		case 'D':
    152      1.10    martin 			departure_script = optarg;
    153      1.10    martin 			break;
    154      1.10    martin 
    155       1.1    martin 		default:
    156       1.1    martin 			errs++;
    157       1.1    martin 			break;
    158       1.1    martin 		}
    159      1.21    dyoung 	}
    160       1.1    martin 
    161       1.1    martin 	if (errs)
    162       1.1    martin 		usage();
    163       1.1    martin 
    164       1.1    martin 	argv += optind;
    165       1.1    martin 	argc -= optind;
    166       1.1    martin 
    167      1.21    dyoung 	if (argc <= 0)
    168       1.1    martin 		usage();
    169       1.1    martin 
    170       1.1    martin 	if (verbose) {
    171       1.1    martin 		printf("up_script: %s\ndown_script: %s\n",
    172       1.1    martin 			up_script, down_script);
    173      1.10    martin 		printf("arrival_script: %s\ndeparture_script: %s\n",
    174      1.10    martin 			arrival_script, departure_script);
    175      1.19    martin 		printf("carrier_script: %s\nno_carrier_script: %s\n",
    176      1.19    martin 			carrier_script, no_carrier_script);
    177       1.1    martin 		printf("verbosity = %d\n", verbose);
    178       1.1    martin 	}
    179       1.1    martin 
    180       1.1    martin 	while (argc > 0) {
    181      1.13    itojun 		list_interfaces(argv[0]);
    182      1.13    itojun 		argv++;
    183      1.13    itojun 		argc--;
    184       1.1    martin 	}
    185       1.1    martin 
    186       1.1    martin 	if (!verbose)
    187      1.21    dyoung 		daemon(0, 0);
    188       1.1    martin 
    189       1.1    martin 	s = socket(PF_ROUTE, SOCK_RAW, 0);
    190       1.1    martin 	if (s < 0) {
    191      1.14    martin 		syslog(LOG_ERR, "error opening routing socket: %m");
    192       1.9      tron 		exit(EXIT_FAILURE);
    193       1.1    martin 	}
    194       1.1    martin 
    195      1.11    martin 	if (!inhibit_initial)
    196      1.11    martin 		run_initial_ups();
    197      1.11    martin 
    198  1.27.2.1  pgoyette 	iov[0].iov_base = buf;
    199  1.27.2.1  pgoyette 	iov[0].iov_len = sizeof(buf);
    200  1.27.2.1  pgoyette 	memset(&msg, 0, sizeof(msg));
    201  1.27.2.1  pgoyette 	msg.msg_iov = iov;
    202  1.27.2.1  pgoyette 	msg.msg_iovlen = 1;
    203  1.27.2.1  pgoyette 
    204       1.1    martin 	for (;;) {
    205  1.27.2.1  pgoyette 		n = recvmsg(s, &msg, 0);
    206  1.27.2.1  pgoyette 		if (n == -1) {
    207  1.27.2.1  pgoyette 			syslog(LOG_ERR, "recvmsg: %m");
    208  1.27.2.1  pgoyette 			exit(EXIT_FAILURE);
    209  1.27.2.1  pgoyette 		}
    210  1.27.2.1  pgoyette 		if (n != 0)
    211  1.27.2.1  pgoyette 			dispatch(iov[0].iov_base, n);
    212       1.1    martin 	}
    213       1.1    martin 
    214       1.1    martin 	close(s);
    215       1.1    martin 	free_interfaces();
    216      1.14    martin 	closelog();
    217       1.1    martin 
    218       1.9      tron 	return EXIT_SUCCESS;
    219       1.1    martin }
    220       1.1    martin 
    221       1.1    martin static void
    222      1.21    dyoung usage(void)
    223       1.1    martin {
    224      1.21    dyoung 	fprintf(stderr,
    225       1.1    martin 	    "usage:\n"
    226      1.15       wiz 	    "\tifwatchd [-hiqv] [-A arrival-script] [-D departure-script]\n"
    227      1.19    martin 	    "\t\t  [-d down-script] [-u up-script]\n"
    228      1.19    martin 	    "\t\t  [-c carrier-script] [-n no-carrier-script] ifname(s)\n"
    229       1.1    martin 	    "\twhere:\n"
    230      1.12       wiz 	    "\t -A <cmd> specify command to run on interface arrival event\n"
    231      1.19    martin 	    "\t -c <cmd> specify command to run on interface carrier-detect event\n"
    232      1.12       wiz 	    "\t -D <cmd> specify command to run on interface departure event\n"
    233      1.12       wiz 	    "\t -d <cmd> specify command to run on interface down event\n"
    234      1.19    martin 	    "\t -n <cmd> specify command to run on interface no-carrier-detect event\n"
    235       1.1    martin 	    "\t -h       show this help message\n"
    236       1.3    martin 	    "\t -i       no (!) initial run of the up script if the interface\n"
    237       1.3    martin 	    "\t          is already up on ifwatchd startup\n"
    238      1.16       abs 	    "\t -q       quiet mode, don't syslog informational messages\n"
    239       1.1    martin 	    "\t -u <cmd> specify command to run on interface up event\n"
    240      1.16       abs 	    "\t -v       verbose/debug output, don't run in background\n");
    241       1.9      tron 	exit(EXIT_FAILURE);
    242       1.1    martin }
    243       1.1    martin 
    244       1.1    martin static void
    245  1.27.2.1  pgoyette dispatch(const void *msg, size_t len)
    246       1.1    martin {
    247  1.27.2.1  pgoyette 	const struct rt_msghdr *hd = msg;
    248  1.27.2.1  pgoyette 
    249  1.27.2.1  pgoyette 	if (hd->rtm_version != RTM_VERSION)
    250  1.27.2.1  pgoyette 		return;
    251       1.1    martin 
    252       1.1    martin 	switch (hd->rtm_type) {
    253       1.1    martin 	case RTM_NEWADDR:
    254       1.1    martin 	case RTM_DELADDR:
    255  1.27.2.1  pgoyette 		check_addrs(msg);
    256  1.27.2.1  pgoyette 		break;
    257       1.1    martin 	case RTM_IFANNOUNCE:
    258  1.27.2.1  pgoyette 		check_announce(msg);
    259  1.27.2.1  pgoyette 		break;
    260      1.19    martin 	case RTM_IFINFO:
    261  1.27.2.1  pgoyette 		check_carrier(msg);
    262  1.27.2.1  pgoyette 		break;
    263      1.23     joerg 	case RTM_ADD:
    264      1.23     joerg 	case RTM_DELETE:
    265      1.23     joerg 	case RTM_CHANGE:
    266      1.23     joerg 	case RTM_LOSING:
    267      1.23     joerg 	case RTM_REDIRECT:
    268      1.23     joerg 	case RTM_MISS:
    269      1.23     joerg 	case RTM_IEEE80211:
    270  1.27.2.1  pgoyette 	case RTM_ONEWADDR:
    271  1.27.2.1  pgoyette 	case RTM_ODELADDR:
    272  1.27.2.1  pgoyette 	case RTM_OCHGADDR:
    273  1.27.2.1  pgoyette 		break;
    274  1.27.2.1  pgoyette 	default:
    275  1.27.2.1  pgoyette 		if (verbose)
    276  1.27.2.1  pgoyette 			printf("unknown message ignored (%d)\n", hd->rtm_type);
    277  1.27.2.1  pgoyette 		break;
    278       1.1    martin 	}
    279  1.27.2.1  pgoyette }
    280  1.27.2.1  pgoyette 
    281  1.27.2.1  pgoyette static enum addrflag
    282  1.27.2.1  pgoyette check_addrflags(int af, int addrflags)
    283  1.27.2.1  pgoyette {
    284       1.1    martin 
    285  1.27.2.1  pgoyette 	switch (af) {
    286  1.27.2.1  pgoyette 	case AF_INET:
    287  1.27.2.1  pgoyette 		if (addrflags & IN_IFF_NOTREADY)
    288  1.27.2.1  pgoyette 			return NOTREADY;
    289  1.27.2.1  pgoyette 		if (addrflags & IN_IFF_DETACHED)
    290  1.27.2.1  pgoyette 			return DETACHED;
    291  1.27.2.1  pgoyette 		break;
    292  1.27.2.1  pgoyette 	case AF_INET6:
    293  1.27.2.1  pgoyette 		if (addrflags & IN6_IFF_NOTREADY)
    294  1.27.2.1  pgoyette 			return NOTREADY;
    295  1.27.2.1  pgoyette 		if (addrflags & IN6_IFF_DETACHED)
    296  1.27.2.1  pgoyette 			return DETACHED;
    297  1.27.2.1  pgoyette 		break;
    298  1.27.2.1  pgoyette 	}
    299  1.27.2.1  pgoyette 	return READY;
    300       1.1    martin }
    301       1.1    martin 
    302       1.1    martin static void
    303  1.27.2.1  pgoyette check_addrs(const struct ifa_msghdr *ifam)
    304       1.1    martin {
    305  1.27.2.1  pgoyette 	const char *cp = (const char *)(ifam + 1);
    306  1.27.2.1  pgoyette 	const struct sockaddr *sa, *ifa = NULL, *brd = NULL;
    307      1.27  riastrad 	unsigned i;
    308  1.27.2.1  pgoyette 	struct interface_data *ifd = NULL;
    309  1.27.2.1  pgoyette 	int aflag;
    310  1.27.2.1  pgoyette 	enum event ev;
    311       1.1    martin 
    312  1.27.2.1  pgoyette 	if (ifam->ifam_addrs == 0)
    313      1.13    itojun 		return;
    314       1.1    martin 	for (i = 1; i; i <<= 1) {
    315  1.27.2.1  pgoyette 		if ((i & ifam->ifam_addrs) == 0)
    316      1.21    dyoung 			continue;
    317  1.27.2.1  pgoyette 		sa = (const struct sockaddr *)cp;
    318      1.21    dyoung 		if (i == RTA_IFP) {
    319  1.27.2.1  pgoyette 			const struct sockaddr_dl *li;
    320  1.27.2.1  pgoyette 
    321  1.27.2.1  pgoyette 			li = (const struct sockaddr_dl *)sa;
    322  1.27.2.1  pgoyette 			if ((ifd = find_interface(li->sdl_index)) == NULL) {
    323      1.21    dyoung 				if (verbose)
    324  1.27.2.1  pgoyette 					printf("ignoring change"
    325  1.27.2.1  pgoyette 					    " on interface #%d\n",
    326  1.27.2.1  pgoyette 					    li->sdl_index);
    327      1.21    dyoung 				return;
    328      1.13    itojun 			}
    329      1.21    dyoung 		} else if (i == RTA_IFA)
    330      1.21    dyoung 			ifa = sa;
    331      1.21    dyoung 		else if (i == RTA_BRD)
    332      1.21    dyoung 			brd = sa;
    333      1.25    martin 		RT_ADVANCE(cp, sa);
    334       1.1    martin 	}
    335  1.27.2.1  pgoyette 	if (ifa != NULL && ifd != NULL) {
    336  1.27.2.1  pgoyette 		ev = ifam->ifam_type == RTM_DELADDR ? DOWN : UP;
    337  1.27.2.1  pgoyette 		aflag = check_addrflags(ifa->sa_family, ifam->ifam_addrflags);
    338  1.27.2.1  pgoyette 		if ((ev == UP && aflag == READY) || ev == DOWN)
    339  1.27.2.1  pgoyette 			invoke_script(ifd->ifname, ev, ifa, brd);
    340      1.18    martin 	}
    341       1.1    martin }
    342       1.1    martin 
    343       1.1    martin static void
    344  1.27.2.1  pgoyette invoke_script(const char *ifname, enum event ev,
    345  1.27.2.1  pgoyette     const struct sockaddr *sa, const struct sockaddr *dest)
    346       1.1    martin {
    347  1.27.2.1  pgoyette 	char addr[NI_MAXHOST], daddr[NI_MAXHOST];
    348       1.1    martin 	const char *script;
    349       1.9      tron 	int status;
    350       1.8      tron 
    351  1.27.2.1  pgoyette 	if (ifname == NULL)
    352      1.13    itojun 		return;
    353       1.8      tron 
    354  1.27.2.1  pgoyette 	script = *scripts[ev];
    355  1.27.2.1  pgoyette 	if (script == NULL)
    356      1.13    itojun 		return;
    357       1.1    martin 
    358  1.27.2.1  pgoyette 	addr[0] = daddr[0] = 0;
    359      1.10    martin 	if (sa != NULL) {
    360  1.27.2.1  pgoyette 		const struct sockaddr_in *sin;
    361  1.27.2.1  pgoyette 		const struct sockaddr_in6 *sin6;
    362  1.27.2.1  pgoyette 
    363  1.27.2.1  pgoyette 		if (sa->sa_len == 0) {
    364  1.27.2.1  pgoyette 			syslog(LOG_ERR,
    365  1.27.2.1  pgoyette 			    "illegal socket address (sa_len == 0)");
    366  1.27.2.1  pgoyette 			return;
    367  1.27.2.1  pgoyette 		}
    368  1.27.2.1  pgoyette 		switch (sa->sa_family) {
    369  1.27.2.1  pgoyette 		case AF_INET:
    370  1.27.2.1  pgoyette 			sin = (const struct sockaddr_in *)sa;
    371  1.27.2.1  pgoyette 			if (sin->sin_addr.s_addr == INADDR_ANY ||
    372  1.27.2.1  pgoyette 			    sin->sin_addr.s_addr == INADDR_BROADCAST)
    373  1.27.2.1  pgoyette 				return;
    374  1.27.2.1  pgoyette 			break;
    375  1.27.2.1  pgoyette 		case AF_INET6:
    376  1.27.2.1  pgoyette 			sin6 = (const struct sockaddr_in6 *)sa;
    377  1.27.2.1  pgoyette 			if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
    378  1.27.2.1  pgoyette 				return;
    379  1.27.2.1  pgoyette 			break;
    380  1.27.2.1  pgoyette 		default:
    381  1.27.2.1  pgoyette 			break;
    382  1.27.2.1  pgoyette 		}
    383  1.27.2.1  pgoyette 
    384      1.13    itojun 		if (getnameinfo(sa, sa->sa_len, addr, sizeof addr, NULL, 0,
    385      1.13    itojun 		    NI_NUMERICHOST)) {
    386      1.13    itojun 			if (verbose)
    387      1.13    itojun 				printf("getnameinfo failed\n");
    388      1.13    itojun 			return;	/* this address can not be handled */
    389      1.13    itojun 		}
    390      1.10    martin 	}
    391  1.27.2.1  pgoyette 
    392       1.4    martin 	if (dest != NULL) {
    393      1.13    itojun 		if (getnameinfo(dest, dest->sa_len, daddr, sizeof daddr,
    394      1.13    itojun 		    NULL, 0, NI_NUMERICHOST)) {
    395      1.13    itojun 			if (verbose)
    396      1.13    itojun 				printf("getnameinfo failed\n");
    397      1.13    itojun 			return;	/* this address can not be handled */
    398      1.13    itojun 		}
    399       1.4    martin 	}
    400       1.1    martin 
    401       1.9      tron 	if (verbose)
    402      1.13    itojun 		(void) printf("calling: %s %s %s %s %s %s\n",
    403      1.13    itojun 		    script, ifname, DummyTTY, DummySpeed, addr, daddr);
    404      1.14    martin 	if (!quiet)
    405      1.14    martin 		syslog(LOG_INFO, "calling: %s %s %s %s %s %s\n",
    406      1.14    martin 		    script, ifname, DummyTTY, DummySpeed, addr, daddr);
    407       1.9      tron 
    408       1.9      tron 	switch (vfork()) {
    409       1.9      tron 	case -1:
    410  1.27.2.1  pgoyette 		syslog(LOG_ERR, "cannot fork: %m");
    411      1.13    itojun 		break;
    412       1.9      tron 	case 0:
    413      1.14    martin 		if (execl(script, script, ifname, DummyTTY, DummySpeed,
    414      1.14    martin 		    addr, daddr, NULL) == -1) {
    415      1.14    martin 			syslog(LOG_ERR, "could not execute \"%s\": %m",
    416      1.14    martin 			    script);
    417      1.14    martin 		}
    418      1.13    itojun 		_exit(EXIT_FAILURE);
    419       1.9      tron 	default:
    420      1.13    itojun 		(void) wait(&status);
    421       1.1    martin 	}
    422       1.1    martin }
    423       1.1    martin 
    424      1.19    martin static void
    425      1.19    martin list_interfaces(const char *ifnames)
    426       1.1    martin {
    427       1.1    martin 	char * names = strdup(ifnames);
    428       1.1    martin 	char * name, *lasts;
    429       1.1    martin 	static const char sep[] = " \t";
    430       1.1    martin 	struct interface_data * p;
    431       1.1    martin 
    432      1.13    itojun 	for (name = strtok_r(names, sep, &lasts);
    433      1.13    itojun 	    name != NULL;
    434      1.13    itojun 	    name = strtok_r(NULL, sep, &lasts)) {
    435      1.13    itojun 		p = malloc(sizeof(*p));
    436      1.13    itojun 		SLIST_INSERT_HEAD(&ifs, p, next);
    437      1.19    martin 		p->last_carrier_status = -1;
    438      1.13    itojun 		p->ifname = strdup(name);
    439      1.13    itojun 		p->index = if_nametoindex(p->ifname);
    440      1.14    martin 		if (!quiet)
    441      1.14    martin 			syslog(LOG_INFO, "watching interface %s", p->ifname);
    442      1.13    itojun 		if (verbose)
    443      1.13    itojun 			printf("interface \"%s\" has index %d\n",
    444      1.13    itojun 			    p->ifname, p->index);
    445       1.1    martin 	}
    446       1.1    martin 	free(names);
    447       1.1    martin }
    448       1.1    martin 
    449      1.10    martin static void
    450  1.27.2.1  pgoyette check_carrier(const struct if_msghdr *ifm)
    451      1.19    martin {
    452      1.19    martin 	struct interface_data * p;
    453  1.27.2.1  pgoyette 	int carrier_status;
    454      1.19    martin 	enum event ev;
    455      1.19    martin 
    456      1.19    martin 	SLIST_FOREACH(p, &ifs, next)
    457  1.27.2.1  pgoyette 		if (p->index == ifm->ifm_index)
    458      1.19    martin 			break;
    459      1.19    martin 
    460      1.19    martin 	if (p == NULL)
    461      1.19    martin 		return;
    462      1.19    martin 
    463      1.21    dyoung 	/*
    464      1.19    martin 	 * Treat it as an event worth handling if:
    465      1.19    martin 	 * - the carrier status changed, or
    466      1.19    martin 	 * - this is the first time we've been called, and
    467      1.19    martin 	 * inhibit_initial is not set
    468      1.19    martin 	 */
    469  1.27.2.1  pgoyette 	carrier_status = ifm->ifm_data.ifi_link_state;
    470  1.27.2.1  pgoyette 	if (carrier_status != p->last_carrier_status) {
    471      1.19    martin 		switch (carrier_status) {
    472      1.19    martin 		case LINK_STATE_UP:
    473      1.19    martin 			ev = CARRIER;
    474      1.19    martin 			break;
    475      1.19    martin 		case LINK_STATE_DOWN:
    476      1.19    martin 			ev = NO_CARRIER;
    477      1.19    martin 			break;
    478      1.19    martin 		default:
    479      1.19    martin 			if (verbose)
    480      1.19    martin 				printf("unknown link status ignored\n");
    481      1.19    martin 			return;
    482      1.19    martin 		}
    483  1.27.2.1  pgoyette 		invoke_script(p->ifname, ev, NULL, NULL);
    484      1.19    martin 		p->last_carrier_status = carrier_status;
    485      1.19    martin 	}
    486      1.19    martin }
    487      1.19    martin 
    488      1.19    martin static void
    489  1.27.2.1  pgoyette check_announce(const struct if_announcemsghdr *ifan)
    490      1.10    martin {
    491      1.10    martin 	struct interface_data * p;
    492      1.10    martin 	const char *ifname = ifan->ifan_name;
    493      1.10    martin 
    494      1.10    martin 	SLIST_FOREACH(p, &ifs, next) {
    495      1.21    dyoung 		if (strcmp(p->ifname, ifname) != 0)
    496      1.21    dyoung 			continue;
    497      1.21    dyoung 
    498      1.21    dyoung 		switch (ifan->ifan_what) {
    499      1.21    dyoung 		case IFAN_ARRIVAL:
    500  1.27.2.1  pgoyette 			p->index = ifan->ifan_index;
    501  1.27.2.1  pgoyette 			invoke_script(p->ifname, ARRIVAL, NULL, NULL);
    502      1.21    dyoung 			break;
    503      1.21    dyoung 		case IFAN_DEPARTURE:
    504  1.27.2.1  pgoyette 			p->index = -1;
    505  1.27.2.1  pgoyette 			p->last_carrier_status = -1;
    506  1.27.2.1  pgoyette 			invoke_script(p->ifname, DEPARTURE, NULL, NULL);
    507      1.21    dyoung 			break;
    508      1.21    dyoung 		default:
    509      1.21    dyoung 			if (verbose)
    510      1.21    dyoung 				(void) printf("unknown announce: "
    511      1.21    dyoung 				    "what=%d\n", ifan->ifan_what);
    512      1.21    dyoung 			break;
    513      1.10    martin 		}
    514      1.21    dyoung 		return;
    515      1.10    martin 	}
    516      1.10    martin }
    517      1.10    martin 
    518      1.21    dyoung static void
    519      1.21    dyoung free_interfaces(void)
    520       1.1    martin {
    521       1.1    martin 	struct interface_data * p;
    522       1.1    martin 
    523       1.1    martin 	while (!SLIST_EMPTY(&ifs)) {
    524      1.13    itojun 		p = SLIST_FIRST(&ifs);
    525      1.13    itojun 		SLIST_REMOVE_HEAD(&ifs, next);
    526      1.13    itojun 		free(p->ifname);
    527      1.13    itojun 		free(p);
    528       1.1    martin 	}
    529       1.1    martin }
    530       1.1    martin 
    531  1.27.2.1  pgoyette static struct interface_data *
    532      1.24     lukem find_interface(int idx)
    533       1.1    martin {
    534       1.1    martin 	struct interface_data * p;
    535      1.21    dyoung 
    536       1.1    martin 	SLIST_FOREACH(p, &ifs, next)
    537      1.24     lukem 		if (p->index == idx)
    538  1.27.2.1  pgoyette 			return p;
    539  1.27.2.1  pgoyette 	return NULL;
    540       1.3    martin }
    541       1.3    martin 
    542      1.21    dyoung static void
    543      1.21    dyoung run_initial_ups(void)
    544       1.3    martin {
    545       1.3    martin 	struct interface_data * ifd;
    546       1.3    martin 	struct ifaddrs *res = NULL, *p;
    547  1.27.2.1  pgoyette 	struct sockaddr *ifa;
    548  1.27.2.1  pgoyette 	int s, aflag;
    549      1.20    martin 
    550      1.20    martin 	s = socket(AF_INET, SOCK_DGRAM, 0);
    551      1.20    martin 	if (s < 0)
    552      1.20    martin 		return;
    553       1.3    martin 
    554      1.21    dyoung 	if (getifaddrs(&res) != 0)
    555      1.21    dyoung 		goto out;
    556      1.21    dyoung 
    557      1.21    dyoung 	for (p = res; p; p = p->ifa_next) {
    558      1.21    dyoung 		SLIST_FOREACH(ifd, &ifs, next) {
    559      1.21    dyoung 			if (strcmp(ifd->ifname, p->ifa_name) == 0)
    560      1.21    dyoung 				break;
    561      1.21    dyoung 		}
    562      1.21    dyoung 		if (ifd == NULL)
    563      1.21    dyoung 			continue;
    564      1.13    itojun 
    565  1.27.2.1  pgoyette 		ifa = p->ifa_addr;
    566  1.27.2.1  pgoyette 		if (ifa != NULL && ifa->sa_family == AF_LINK)
    567  1.27.2.1  pgoyette 			invoke_script(ifd->ifname, ARRIVAL, NULL, NULL);
    568      1.21    dyoung 
    569      1.21    dyoung 		if ((p->ifa_flags & IFF_UP) == 0)
    570      1.21    dyoung 			continue;
    571  1.27.2.1  pgoyette 		if (ifa == NULL)
    572      1.21    dyoung 			continue;
    573  1.27.2.1  pgoyette 		if (ifa->sa_family == AF_LINK) {
    574      1.21    dyoung 			struct ifmediareq ifmr;
    575      1.21    dyoung 
    576      1.21    dyoung 			memset(&ifmr, 0, sizeof(ifmr));
    577      1.21    dyoung 			strncpy(ifmr.ifm_name, ifd->ifname,
    578      1.21    dyoung 			    sizeof(ifmr.ifm_name));
    579      1.21    dyoung 			if (ioctl(s, SIOCGIFMEDIA, &ifmr) != -1
    580      1.21    dyoung 			    && (ifmr.ifm_status & IFM_AVALID)
    581      1.21    dyoung 			    && (ifmr.ifm_status & IFM_ACTIVE)) {
    582  1.27.2.1  pgoyette 				invoke_script(ifd->ifname, CARRIER, NULL, NULL);
    583      1.21    dyoung 				ifd->last_carrier_status =
    584      1.21    dyoung 				    LINK_STATE_UP;
    585      1.21    dyoung 			    }
    586      1.21    dyoung 			continue;
    587      1.21    dyoung 		}
    588  1.27.2.1  pgoyette 		aflag = check_addrflags(ifa->sa_family, p->ifa_addrflags);
    589  1.27.2.1  pgoyette 		if (aflag != READY)
    590  1.27.2.1  pgoyette 			continue;
    591  1.27.2.1  pgoyette 		invoke_script(ifd->ifname, UP, ifa, p->ifa_dstaddr);
    592       1.3    martin 	}
    593      1.21    dyoung 	freeifaddrs(res);
    594      1.21    dyoung out:
    595      1.20    martin 	close(s);
    596       1.1    martin }
    597