858 lines
18 KiB
C
858 lines
18 KiB
C
/* $KAME: rtsold.c,v 1.67 2003/05/17 18:16:15 itojun Exp $ */
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/*
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* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/socket.h>
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#include <sys/param.h>
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#include <net/if.h>
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#include <net/if_dl.h>
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#include <netinet/in.h>
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#include <netinet/icmp6.h>
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#include <signal.h>
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#include <unistd.h>
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#include <syslog.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <errno.h>
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#include <err.h>
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#include <stdarg.h>
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#include <ifaddrs.h>
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#ifdef HAVE_POLL_H
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#include <poll.h>
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#endif
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#include "rtsold.h"
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struct ifinfo *iflist;
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struct timeval tm_max = {0x7fffffff, 0x7fffffff};
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static int log_upto = 999;
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static int fflag = 0;
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int Fflag = 0; /* force setting sysctl parameters */
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int aflag = 0;
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int dflag = 0;
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char *otherconf_script;
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/* protocol constants */
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#define MAX_RTR_SOLICITATION_DELAY 1 /* second */
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#define RTR_SOLICITATION_INTERVAL 4 /* seconds */
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#define MAX_RTR_SOLICITATIONS 3 /* times */
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/*
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* implementation dependent constants in seconds
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* XXX: should be configurable
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*/
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#define PROBE_INTERVAL 60
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int main(int, char **);
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/* static variables and functions */
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static int mobile_node = 0;
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#ifndef SMALL
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static int do_dump;
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static char *dumpfilename = "/var/run/rtsold.dump"; /* XXX: should be configurable */
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#endif
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#if 1
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static char *pidfilename = "/var/run/rtsold.pid"; /* should be configurable */
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#endif
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#if 0
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static int ifreconfig(char *);
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#endif
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static int make_packet(struct ifinfo *);
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static struct timeval *rtsol_check_timer(void);
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#ifndef SMALL
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static void rtsold_set_dump_file(int);
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#endif
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static void usage(char *);
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int
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main(int argc, char **argv)
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{
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int s, ch, once = 0;
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struct timeval *timeout;
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char *argv0, *opts;
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#ifdef HAVE_POLL_H
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struct pollfd set[2];
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#else
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fd_set *fdsetp, *selectfdp;
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int fdmasks;
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int maxfd;
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#endif
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int rtsock;
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/*
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* Initialization
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*/
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argv0 = argv[0];
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/* get option */
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if (argv0 && argv0[strlen(argv0) - 1] != 'd') {
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fflag = 1;
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once = 1;
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opts = "adDFO:";
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} else
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opts = "adDfFm1O:";
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while ((ch = getopt(argc, argv, opts)) != -1) {
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switch (ch) {
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case 'a':
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aflag = 1;
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break;
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case 'd':
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dflag = 1;
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break;
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case 'D':
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dflag = 2;
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break;
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case 'f':
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fflag = 1;
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break;
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case 'F':
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Fflag = 1;
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break;
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case 'm':
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mobile_node = 1;
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break;
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case '1':
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once = 1;
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break;
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case 'O':
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otherconf_script = optarg;
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break;
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default:
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usage(argv0);
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/*NOTREACHED*/
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}
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}
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argc -= optind;
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argv += optind;
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if ((!aflag && argc == 0) || (aflag && argc != 0)) {
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usage(argv0);
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/*NOTREACHED*/
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}
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/* set log level */
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if (dflag == 0)
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log_upto = LOG_NOTICE;
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if (!fflag) {
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char *ident;
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ident = strrchr(argv0, '/');
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if (!ident)
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ident = argv0;
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else
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ident++;
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openlog(ident, LOG_NDELAY|LOG_PID, LOG_DAEMON);
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if (log_upto >= 0)
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setlogmask(LOG_UPTO(log_upto));
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}
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if (otherconf_script && *otherconf_script != '/') {
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errx(1, "configuration script (%s) must be an absolute path",
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otherconf_script);
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}
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#ifndef HAVE_ARC4RANDOM
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/* random value initialization */
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srandom((u_long)time(NULL));
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#endif
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if (Fflag) {
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setinet6sysctl(IPV6CTL_FORWARDING, 0);
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} else {
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/* warn if forwarding is up */
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if (getinet6sysctl(IPV6CTL_FORWARDING))
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warnx("kernel is configured as a router, not a host");
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}
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#ifndef SMALL
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/* initialization to dump internal status to a file */
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signal(SIGUSR1, rtsold_set_dump_file);
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#endif
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if (!fflag)
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daemon(0, 0); /* act as a daemon */
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/*
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* Open a socket for sending RS and receiving RA.
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* This should be done before calling ifinit(), since the function
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* uses the socket.
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*/
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if ((s = sockopen()) < 0) {
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warnmsg(LOG_ERR, __func__, "failed to open a socket");
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exit(1);
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/*NOTREACHED*/
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}
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#ifdef HAVE_POLL_H
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set[0].fd = s;
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set[0].events = POLLIN;
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#else
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maxfd = s;
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#endif
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#ifdef HAVE_POLL_H
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set[1].fd = -1;
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#endif
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if ((rtsock = rtsock_open()) < 0) {
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warnmsg(LOG_ERR, __func__, "failed to open a socket");
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exit(1);
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/*NOTREACHED*/
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}
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#ifdef HAVE_POLL_H
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set[1].fd = rtsock;
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set[1].events = POLLIN;
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#else
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if (rtsock > maxfd)
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maxfd = rtsock;
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#endif
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#ifndef HAVE_POLL_H
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fdmasks = howmany(maxfd + 1, NFDBITS) * sizeof(fd_mask);
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if ((fdsetp = malloc(fdmasks)) == NULL) {
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err(1, "malloc");
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/*NOTREACHED*/
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}
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if ((selectfdp = malloc(fdmasks)) == NULL) {
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err(1, "malloc");
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/*NOTREACHED*/
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}
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#endif
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/* configuration per interface */
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if (ifinit()) {
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warnmsg(LOG_ERR, __func__,
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"failed to initialize interfaces");
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exit(1);
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/*NOTREACHED*/
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}
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if (aflag)
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argv = autoifprobe();
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while (argv && *argv) {
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if (ifconfig(*argv)) {
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warnmsg(LOG_ERR, __func__,
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"failed to initialize %s", *argv);
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exit(1);
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/*NOTREACHED*/
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}
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argv++;
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}
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/* setup for probing default routers */
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if (probe_init()) {
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warnmsg(LOG_ERR, __func__,
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"failed to setup for probing routers");
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exit(1);
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/*NOTREACHED*/
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}
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#if 1
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/* dump the current pid */
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if (!once) {
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pid_t pid = getpid();
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FILE *fp;
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if ((fp = fopen(pidfilename, "w")) == NULL)
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warnmsg(LOG_ERR, __func__,
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"failed to open a pid log file(%s): %s",
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pidfilename, strerror(errno));
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else {
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fprintf(fp, "%d\n", pid);
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fclose(fp);
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}
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}
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#endif
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#ifndef HAVE_POLL_H
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memset(fdsetp, 0, fdmasks);
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FD_SET(s, fdsetp);
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FD_SET(rtsock, fdsetp);
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#endif
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while (1) { /* main loop */
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int e;
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#ifndef HAVE_POLL_H
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memcpy(selectfdp, fdsetp, fdmasks);
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#endif
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#ifndef SMALL
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if (do_dump) { /* SIGUSR1 */
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do_dump = 0;
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rtsold_dump_file(dumpfilename);
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}
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#endif
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timeout = rtsol_check_timer();
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if (once) {
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struct ifinfo *ifi;
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/* if we have no timeout, we are done (or failed) */
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if (timeout == NULL)
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break;
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/* if all interfaces have got RA packet, we are done */
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for (ifi = iflist; ifi; ifi = ifi->next) {
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if (ifi->state != IFS_DOWN && ifi->racnt == 0)
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break;
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}
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if (ifi == NULL)
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break;
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}
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#ifdef HAVE_POLL_H
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e = poll(set, 2, timeout ? (timeout->tv_sec * 1000 + timeout->tv_usec / 1000) : INFTIM);
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#else
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e = select(maxfd + 1, selectfdp, NULL, NULL, timeout);
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#endif
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if (e < 1) {
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if (e < 0 && errno != EINTR) {
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warnmsg(LOG_ERR, __func__, "select: %s",
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strerror(errno));
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}
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continue;
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}
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/* packet reception */
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#ifdef HAVE_POLL_H
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if (set[1].revents & POLLIN)
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#else
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if (FD_ISSET(rtsock, selectfdp))
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#endif
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rtsock_input(rtsock);
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#ifdef HAVE_POLL_H
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if (set[0].revents & POLLIN)
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#else
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if (FD_ISSET(s, selectfdp))
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#endif
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rtsol_input(s);
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}
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/* NOTREACHED */
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return 0;
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}
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int
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ifconfig(char *ifname)
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{
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struct ifinfo *ifinfo;
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struct sockaddr_dl *sdl;
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int flags;
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if ((sdl = if_nametosdl(ifname)) == NULL) {
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warnmsg(LOG_ERR, __func__,
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"failed to get link layer information for %s", ifname);
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return(-1);
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}
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if (find_ifinfo(sdl->sdl_index)) {
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warnmsg(LOG_ERR, __func__,
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"interface %s was already configured", ifname);
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free(sdl);
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return(-1);
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}
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if ((ifinfo = malloc(sizeof(*ifinfo))) == NULL) {
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warnmsg(LOG_ERR, __func__, "memory allocation failed");
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free(sdl);
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return(-1);
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}
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memset(ifinfo, 0, sizeof(*ifinfo));
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ifinfo->sdl = sdl;
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strlcpy(ifinfo->ifname, ifname, sizeof(ifinfo->ifname));
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/* construct a router solicitation message */
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if (make_packet(ifinfo))
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goto bad;
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/* set link ID of this interface. */
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#ifdef HAVE_SCOPELIB
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if (inet_zoneid(AF_INET6, 2, ifname, &ifinfo->linkid))
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goto bad;
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#else
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/* XXX: assume interface IDs as link IDs */
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ifinfo->linkid = ifinfo->sdl->sdl_index;
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#endif
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/*
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* check if the interface is available.
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* also check if SIOCGIFMEDIA ioctl is OK on the interface.
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*/
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ifinfo->mediareqok = 1;
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ifinfo->active = interface_status(ifinfo);
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if (!ifinfo->mediareqok) {
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/*
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* probe routers periodically even if the link status
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* does not change.
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*/
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ifinfo->probeinterval = PROBE_INTERVAL;
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}
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/* activate interface: interface_up returns 0 on success */
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flags = interface_up(ifinfo->ifname);
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if (flags == 0)
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ifinfo->state = IFS_DELAY;
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else if (flags == IFS_TENTATIVE)
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ifinfo->state = IFS_TENTATIVE;
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else
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ifinfo->state = IFS_DOWN;
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rtsol_timer_update(ifinfo);
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/* link into chain */
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if (iflist)
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ifinfo->next = iflist;
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iflist = ifinfo;
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return(0);
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bad:
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free(ifinfo->sdl);
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free(ifinfo);
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return(-1);
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}
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void
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iflist_init(void)
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{
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struct ifinfo *ifi, *next;
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for (ifi = iflist; ifi; ifi = next) {
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next = ifi->next;
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if (ifi->sdl)
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free(ifi->sdl);
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if (ifi->rs_data)
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free(ifi->rs_data);
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free(ifi);
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iflist = NULL;
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}
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}
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#if 0
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static int
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ifreconfig(char *ifname)
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{
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struct ifinfo *ifi, *prev;
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int rv;
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prev = NULL;
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for (ifi = iflist; ifi; ifi = ifi->next) {
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if (strncmp(ifi->ifname, ifname, sizeof(ifi->ifname)) == 0)
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break;
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prev = ifi;
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}
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prev->next = ifi->next;
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rv = ifconfig(ifname);
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/* reclaim it after ifconfig() in case ifname is pointer inside ifi */
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if (ifi->rs_data)
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free(ifi->rs_data);
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free(ifi->sdl);
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free(ifi);
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return rv;
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}
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#endif
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struct ifinfo *
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find_ifinfo(int ifindex)
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{
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struct ifinfo *ifi;
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for (ifi = iflist; ifi; ifi = ifi->next)
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if (ifi->sdl->sdl_index == ifindex)
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return(ifi);
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return(NULL);
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}
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static int
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make_packet(struct ifinfo *ifinfo)
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{
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size_t packlen = sizeof(struct nd_router_solicit), lladdroptlen = 0;
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struct nd_router_solicit *rs;
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char *buf;
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if ((lladdroptlen = lladdropt_length(ifinfo->sdl)) == 0) {
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warnmsg(LOG_INFO, __func__,
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"link-layer address option has null length"
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" on %s. Treat as not included.", ifinfo->ifname);
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}
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packlen += lladdroptlen;
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ifinfo->rs_datalen = packlen;
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/* allocate buffer */
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if ((buf = malloc(packlen)) == NULL) {
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warnmsg(LOG_ERR, __func__,
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"memory allocation failed for %s", ifinfo->ifname);
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return(-1);
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}
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ifinfo->rs_data = buf;
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/* fill in the message */
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rs = (struct nd_router_solicit *)buf;
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rs->nd_rs_type = ND_ROUTER_SOLICIT;
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rs->nd_rs_code = 0;
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rs->nd_rs_cksum = 0;
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rs->nd_rs_reserved = 0;
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buf += sizeof(*rs);
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/* fill in source link-layer address option */
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if (lladdroptlen)
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lladdropt_fill(ifinfo->sdl, (struct nd_opt_hdr *)buf);
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return(0);
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}
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static struct timeval *
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rtsol_check_timer(void)
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{
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static struct timeval returnval;
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struct timeval now, rtsol_timer;
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struct ifinfo *ifinfo;
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int flags;
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gettimeofday(&now, NULL);
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rtsol_timer = tm_max;
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for (ifinfo = iflist; ifinfo; ifinfo = ifinfo->next) {
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if (timercmp(&ifinfo->expire, &now, <=)) {
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if (dflag > 1)
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warnmsg(LOG_DEBUG, __func__,
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"timer expiration on %s, "
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"state = %d", ifinfo->ifname,
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ifinfo->state);
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switch (ifinfo->state) {
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case IFS_DOWN:
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case IFS_TENTATIVE:
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/* interface_up returns 0 on success */
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flags = interface_up(ifinfo->ifname);
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if (flags == 0)
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ifinfo->state = IFS_DELAY;
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|
else if (flags == IFS_TENTATIVE)
|
|
ifinfo->state = IFS_TENTATIVE;
|
|
else
|
|
ifinfo->state = IFS_DOWN;
|
|
break;
|
|
case IFS_IDLE:
|
|
{
|
|
int oldstatus = ifinfo->active;
|
|
int probe = 0;
|
|
|
|
ifinfo->active = interface_status(ifinfo);
|
|
|
|
if (oldstatus != ifinfo->active) {
|
|
warnmsg(LOG_DEBUG, __func__,
|
|
"%s status is changed"
|
|
" from %d to %d",
|
|
ifinfo->ifname,
|
|
oldstatus, ifinfo->active);
|
|
probe = 1;
|
|
ifinfo->state = IFS_DELAY;
|
|
} else if (ifinfo->probeinterval &&
|
|
(ifinfo->probetimer -=
|
|
ifinfo->timer.tv_sec) <= 0) {
|
|
/* probe timer expired */
|
|
ifinfo->probetimer =
|
|
ifinfo->probeinterval;
|
|
probe = 1;
|
|
ifinfo->state = IFS_PROBE;
|
|
}
|
|
|
|
/*
|
|
* If we need a probe, clear the previous
|
|
* status wrt the "other" configuration.
|
|
*/
|
|
if (probe)
|
|
ifinfo->otherconfig = 0;
|
|
|
|
if (probe && mobile_node)
|
|
defrouter_probe(ifinfo);
|
|
break;
|
|
}
|
|
case IFS_DELAY:
|
|
ifinfo->state = IFS_PROBE;
|
|
sendpacket(ifinfo);
|
|
break;
|
|
case IFS_PROBE:
|
|
if (ifinfo->probes < MAX_RTR_SOLICITATIONS)
|
|
sendpacket(ifinfo);
|
|
else {
|
|
warnmsg(LOG_INFO, __func__,
|
|
"No answer after sending %d RSs",
|
|
ifinfo->probes);
|
|
ifinfo->probes = 0;
|
|
ifinfo->state = IFS_IDLE;
|
|
}
|
|
break;
|
|
}
|
|
rtsol_timer_update(ifinfo);
|
|
}
|
|
|
|
if (timercmp(&ifinfo->expire, &rtsol_timer, <))
|
|
rtsol_timer = ifinfo->expire;
|
|
}
|
|
|
|
if (timercmp(&rtsol_timer, &tm_max, ==)) {
|
|
warnmsg(LOG_DEBUG, __func__, "there is no timer");
|
|
return(NULL);
|
|
} else if (timercmp(&rtsol_timer, &now, <))
|
|
/* this may occur when the interval is too small */
|
|
returnval.tv_sec = returnval.tv_usec = 0;
|
|
else
|
|
timersub(&rtsol_timer, &now, &returnval);
|
|
|
|
if (dflag > 1)
|
|
warnmsg(LOG_DEBUG, __func__, "New timer is %ld:%08ld",
|
|
(long)returnval.tv_sec, (long)returnval.tv_usec);
|
|
|
|
return(&returnval);
|
|
}
|
|
|
|
void
|
|
rtsol_timer_update(struct ifinfo *ifinfo)
|
|
{
|
|
#define MILLION 1000000
|
|
#define DADRETRY 10 /* XXX: adhoc */
|
|
long interval;
|
|
struct timeval now;
|
|
|
|
bzero(&ifinfo->timer, sizeof(ifinfo->timer));
|
|
|
|
switch (ifinfo->state) {
|
|
case IFS_DOWN:
|
|
case IFS_TENTATIVE:
|
|
if (++ifinfo->dadcount > DADRETRY) {
|
|
ifinfo->dadcount = 0;
|
|
ifinfo->timer.tv_sec = PROBE_INTERVAL;
|
|
} else
|
|
ifinfo->timer.tv_sec = 1;
|
|
break;
|
|
case IFS_IDLE:
|
|
if (mobile_node) {
|
|
/* XXX should be configurable */
|
|
ifinfo->timer.tv_sec = 3;
|
|
}
|
|
else
|
|
ifinfo->timer = tm_max; /* stop timer(valid?) */
|
|
break;
|
|
case IFS_DELAY:
|
|
#ifndef HAVE_ARC4RANDOM
|
|
interval = random() % (MAX_RTR_SOLICITATION_DELAY * MILLION);
|
|
#else
|
|
interval = arc4random_uniform(MAX_RTR_SOLICITATION_DELAY * MILLION);
|
|
#endif
|
|
ifinfo->timer.tv_sec = interval / MILLION;
|
|
ifinfo->timer.tv_usec = interval % MILLION;
|
|
break;
|
|
case IFS_PROBE:
|
|
if (ifinfo->probes < MAX_RTR_SOLICITATIONS)
|
|
ifinfo->timer.tv_sec = RTR_SOLICITATION_INTERVAL;
|
|
else {
|
|
/*
|
|
* After sending MAX_RTR_SOLICITATIONS solicitations,
|
|
* we're just waiting for possible replies; there
|
|
* will be no more solicitation. Thus, we change
|
|
* the timer value to MAX_RTR_SOLICITATION_DELAY based
|
|
* on RFC 2461, Section 6.3.7.
|
|
*/
|
|
ifinfo->timer.tv_sec = MAX_RTR_SOLICITATION_DELAY;
|
|
}
|
|
break;
|
|
default:
|
|
warnmsg(LOG_ERR, __func__,
|
|
"illegal interface state(%d) on %s",
|
|
ifinfo->state, ifinfo->ifname);
|
|
return;
|
|
}
|
|
|
|
/* reset the timer */
|
|
if (timercmp(&ifinfo->timer, &tm_max, ==)) {
|
|
ifinfo->expire = tm_max;
|
|
warnmsg(LOG_DEBUG, __func__,
|
|
"stop timer for %s", ifinfo->ifname);
|
|
} else {
|
|
gettimeofday(&now, NULL);
|
|
timeradd(&now, &ifinfo->timer, &ifinfo->expire);
|
|
|
|
if (dflag > 1)
|
|
warnmsg(LOG_DEBUG, __func__,
|
|
"set timer for %s to %d:%d", ifinfo->ifname,
|
|
(int)ifinfo->timer.tv_sec,
|
|
(int)ifinfo->timer.tv_usec);
|
|
}
|
|
|
|
#undef MILLION
|
|
}
|
|
|
|
/* timer related utility functions */
|
|
#define MILLION 1000000
|
|
|
|
#ifndef SMALL
|
|
static void
|
|
rtsold_set_dump_file(int sig)
|
|
{
|
|
do_dump = 1;
|
|
}
|
|
#endif
|
|
|
|
static void
|
|
usage(char *progname)
|
|
{
|
|
if (progname && progname[strlen(progname) - 1] != 'd') {
|
|
fprintf(stderr, "usage: rtsol [-dDF] interfaces...\n");
|
|
fprintf(stderr, "usage: rtsol [-dDF] -a\n");
|
|
} else {
|
|
fprintf(stderr, "usage: rtsold [-adDfFm1] interfaces...\n");
|
|
fprintf(stderr, "usage: rtsold [-dDfFm1] -a\n");
|
|
}
|
|
exit(1);
|
|
}
|
|
|
|
void
|
|
#if __STDC__
|
|
warnmsg(int priority, const char *func, const char *msg, ...)
|
|
#else
|
|
warnmsg(priority, func, msg, va_alist)
|
|
int priority;
|
|
const char *func;
|
|
const char *msg;
|
|
va_dcl
|
|
#endif
|
|
{
|
|
va_list ap;
|
|
char buf[BUFSIZ];
|
|
|
|
va_start(ap, msg);
|
|
if (fflag) {
|
|
if (priority <= log_upto) {
|
|
(void)vfprintf(stderr, msg, ap);
|
|
(void)fprintf(stderr, "\n");
|
|
}
|
|
} else {
|
|
snprintf(buf, sizeof(buf), "<%s> %s", func, msg);
|
|
msg = buf;
|
|
vsyslog(priority, msg, ap);
|
|
}
|
|
va_end(ap);
|
|
}
|
|
|
|
/*
|
|
* return a list of interfaces which is suitable to sending an RS.
|
|
*/
|
|
char **
|
|
autoifprobe(void)
|
|
{
|
|
static char **argv = NULL;
|
|
static int n = 0;
|
|
char **a;
|
|
int i, found;
|
|
struct ifaddrs *ifap, *ifa, *target;
|
|
|
|
/* initialize */
|
|
while (n--)
|
|
free(argv[n]);
|
|
if (argv) {
|
|
free(argv);
|
|
argv = NULL;
|
|
}
|
|
n = 0;
|
|
|
|
if (getifaddrs(&ifap) != 0)
|
|
return NULL;
|
|
|
|
target = NULL;
|
|
/* find an ethernet */
|
|
for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
|
|
if ((ifa->ifa_flags & IFF_UP) == 0)
|
|
continue;
|
|
if ((ifa->ifa_flags & IFF_POINTOPOINT) != 0)
|
|
continue;
|
|
if ((ifa->ifa_flags & IFF_LOOPBACK) != 0)
|
|
continue;
|
|
if ((ifa->ifa_flags & IFF_MULTICAST) == 0)
|
|
continue;
|
|
|
|
if (ifa->ifa_addr->sa_family != AF_INET6)
|
|
continue;
|
|
|
|
found = 0;
|
|
for (i = 0; i < n; i++) {
|
|
if (strcmp(argv[i], ifa->ifa_name) == 0) {
|
|
found++;
|
|
break;
|
|
}
|
|
}
|
|
if (found)
|
|
continue;
|
|
|
|
/* if we find multiple candidates, just warn. */
|
|
if (n != 0 && dflag > 1)
|
|
warnx("multiple interfaces found");
|
|
|
|
a = (char **)realloc(argv, (n + 1) * sizeof(char **));
|
|
if (a == NULL)
|
|
err(1, "realloc");
|
|
argv = a;
|
|
argv[n] = strdup(ifa->ifa_name);
|
|
if (!argv[n])
|
|
err(1, "malloc");
|
|
n++;
|
|
argv[n] = NULL;
|
|
}
|
|
|
|
if (n) {
|
|
a = (char **)realloc(argv, (n + 1) * sizeof(char **));
|
|
if (a == NULL)
|
|
err(1, "realloc");
|
|
argv = a;
|
|
argv[n] = NULL;
|
|
|
|
if (dflag > 0) {
|
|
for (i = 0; i < n; i++)
|
|
warnx("probing %s", argv[i]);
|
|
}
|
|
}
|
|
freeifaddrs(ifap);
|
|
return argv;
|
|
}
|